Change search
Refine search result
19202122232425 1051 - 1100 of 10719
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1051.
    Bagherbandi, Mohammad
    et al.
    Royal Institute of Technology (KTH), Division of Geodesy and Geoinformatics.
    Eshagh, Mehdi
    Department of Surveying, Islamic Azad University, Shahr-e-Rey Branch, Tehran, Iran.
    Recovery of Moho's undulations based on the Vening Meinesz-Moritz theory from satellite gravity gradiometry data: A simulation study2012In: Advances in Space Research, ISSN 0273-1177, E-ISSN 1879-1948, Vol. 49, no 6, p. 1097-1111Article in journal (Refereed)
    Abstract [en]

    In the gravimetric approach to determine the Moho depth an isostatic hypothesis can be used. The Vening Meinesz–Moritz isostatic hypothesis is the recent theory for such a purpose. Here, this theory is further developed so that the satellite gravity gradiometry (SGG) data are used for recovering the Moho depth through a nonlinear integral inversion procedure. The kernels of its forward and inverse problems show that the inversion should be done in a larger area by 5° than the desired one to reduce the effect of the spatial truncation error of the integral formula. Our numerical study shows that the effect of this error on the recovered Moho depths can reach 6 km in Persia and it is very significant. The iterative Tikhonov regularization in a combination with either generalized cross validation or quasi-optimal criterion of estimating the regularization parameter seems to be suitable and the solution is semi-convergent up to the third iteration. Also the Moho depth recovered from the simulated SGG data will be more or less the same as that obtained from the terrestrial gravimetric data with a root mean square error of 2 km and they are statistically consistent.

  • 1052.
    Bahbou, M. Fouzi
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    A study of the adhesion strength of plasma sprayed coatings2007Doctoral thesis, comprehensive summary (Other academic)
  • 1053.
    Bahbou, M. Fouzi
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Choquet, Isabelle
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Clement, Uta
    Numerical and experimental study of Ni-particle impact on a ti-surfaceIn: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016Article in journal (Refereed)
  • 1054.
    Bahbou, M. Fouzi
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Choquet, Isabelle
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Nylén, Per
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Numerical and Experimental Study of Ni-Particle Impact On A Ti-Surface2007In: Proceedings of the International Thermal Spray Conference: May 2007, Beijing, China, ASM International , 2007, p. 219-224Conference paper (Refereed)
  • 1055.
    Bahbou, M. Fouzi
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Nylén, Per
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    On-Line Measurement of Plasma-Sprayed Ni-Particles during Impact on a Ti-Surface: influence of Surface Oxidation2007In: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 16, no 4, p. 506-511Article in journal (Refereed)
    Abstract [en]

    The objective of this study was to analyze the impact of plasma-sprayed Ni5%Al particles on polished and grit-blasted Ti6Al4V samples under oxidized and nonoxidized conditions. For this purpose, measurements of thermal radiation and velocity of individual plasma-sprayed particles were carried out. From the thermal radiation at impact, splat diameter during flattening and temperature evolution during cooling were evaluated. Characteristic parameters related to the quality of contact between the splat and the substrate were retrieved. The flattening speed was introduced to characterize wetting, while the cooling rate was used to characterize solidification. The idea was to get a signature of particle impact for a given surface roughness and oxidation state by identifying parameters which strongly affect the splat behavior. Sieved Ni5%Al powder in a narrow range (+65 −75 μm) was sprayed on four sets of titanium alloy surfaces, consisting of polished and grit-blasted samples, one set had a nonoxidized surface and the other one was oxidized in an oven at 600 °C for two hours. Resulting splats after impact were characterized by scanning electron microscopy, the splats on oxidized surface showed pores in their core and detached fingers at the periphery. The cooling rate and flattening degree significantly increased on the oxidized smooth surface compared to the nonoxidized one. This trend was not found in grit-blasted surfaces, which implies that impact phenomena are different on grit-blasted surfaces than on smooth surfaces thus further work is needed.

  • 1056.
    Bahbou, M. Fouzi
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Nylén, Per
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    On-Line measurement of plasma-sprayed ni-particles during impact on a ti-surface: influence of surface oxidation2007In: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 16, no 6, p. 506-511Article in journal (Refereed)
    Abstract [en]

    The objective of this study was to analyze the impact of plasma-sprayed Ni5%Al particles on polished and grit-blasted Ti6Al4V samples under oxidized and nonoxidized conditions. For this purpose, measurements of thermal radiation and velocity of individual plasma-sprayed particles were carried out. From the thermal radiation at impact, splat diameter during flattening and temperature evolution during cooling were evaluated. Characteristic parameters related to the quality of contact between the splat and the substrate were retrieved. The flattening speed was introduced to characterize wetting, while the cooling rate was used to characterize solidification. The idea was to get a signature of particle impact for a given surface roughness and oxidation state by identifying parameters which strongly affect the splat behavior. Sieved Ni5%Al powder in a narrow range (+65 −75 μm) was sprayed on four sets of titanium alloy surfaces, consisting of polished and grit-blasted samples, one set had a nonoxidized surface and the other one was oxidized in an oven at 600 °C for two hours. Resulting splats after impact were characterized by scanning electron microscopy, the splats on oxidized surface showed pores in their core and detached fingers at the periphery. The cooling rate and flattening degree significantly increased on the oxidized smooth surface compared to the nonoxidized one. This trend was not found in grit-blasted surfaces, which implies that impact phenomena are different on grit-blasted surfaces than on smooth surfaces thus further work is needed.

  • 1057.
    Bahbou, M. Fouzi
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Nylén, Per
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Relationship between surface topgraphy parameters and adhesion strength for plasma spraying2005In: ITSC 2005: Thermal Spray connects: Explore its surfacing potential!, The Material Information Society , 2005, p. 1027-1031Conference paper (Refereed)
    Abstract [en]

    To achieve sufficient adhesion strength within thermal spraying, the surface to be coated has to be modified. Grit blasting is the most common way to generate a clean and roughened surface. The bonding mechanism between the grit-blasted substrate and the coating is assumed to be due to mechanical anchoring, why an optimal surface roughness is essential. The surface roughness is usually evaluated using Ra which cannot fully characterize the complex nature of the chaotic substrate topography. This study was performed in order to evaluate if Ra can be replaced by other surface characteristic parameters such us R.q, Rpk, Rpv, Rk…with higher correlation to adhesion strength. Average roughness was measured by a perthometer and with white light interferometry to get 3D images of the surface topography. Disc shaped substrate samples of Ti6Al4V (AMS 4928) were grit blasted with aluminium oxide grit and plasma sprayed with a Ni5%Al coating. Adhesion strength was determined according to the ASTM C633 standard. The correlation between a number of different surface-parameters and adhesion strength were evaluated and compared with Ra.

  • 1058.
    Bahbou, M. Fouzi
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Nylén, Per
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Two-step grit blasting for enhanced adhesion of thermal spray coatings2004In: Surface modification technologies XVIII: proceedings of the eighteenth international conference on surface modification technologies held in Dijon, France November 15-17, 2004, 2004, p. 23-27Conference paper (Refereed)
  • 1059.
    Bahbou, M. Fouzi
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Nylén, Per
    University West, Department of Engineering Science, Division of Production Engineering.
    Barbezat, G.
    Sulzer Metco, Wohlen, Switzerland .
    A parameter study of the Protal® Process to optimise the adhesion of Ni5Al Coatings2004In: Thermal Spray 2004 : Advances in technology and applications: Proceedings of the International Thermal Spray Conference 10-12 May 2004, Osaka, Japan Thermal Spray 2004, 2004, p. 898-902Conference paper (Refereed)
    Abstract [en]

    The Protal process combines surface preparation using a laser and thermal spraying in one production step. The laser preparation is based on a photomechanical reaction induced by the interaction between a laser of high instantaneous power and a polluted surface. The mechanism of bonding and the coating-substrate interface are then changed in comparison with grit blasting resulting in a significantly reduced substrate roughness. This study is aimed at finding the optimal Protal process parameters for the coating adhesion of a Ni5%Al sprayed on Ti6Al4V and IN718 alloys. The parameters investigated are laser beam intensity, the time delay between the laser impact and the spray impact, powder feed rate, substrate roughness and temperature. A test plan including these parameters is analysed by means of a fractional factorial design of experiment method. The adhesions of the coatings are measured using the ASTM C633 standard test. Data are analysed by a multiple linear regression model using a least squares fit. In addition, the coating/substrate interface is examined by optical and electron scanning microscopy (SEM) techniques as well as by Auger electron spectroscopy. Substrate roughness, substrate temperature and laser intensity are all shown to have a negative correlation with adhesion strength within the investigated range. Areas of diffusion are noticed at the coating/substrate interface.

  • 1060.
    Bahbou, M. Fouzi
    et al.
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Nylén, Per
    University West, Department of Technology, Mathematics and Computer Science, Division for Mechanical Engineering.
    Wigren, J.
    Volvo Aero, Trollhättan.
    Effect of grit blasting and spraying angle on the adhesion strength of a plasma-sprayed coating2004In: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 13, no 4, p. 508-514Article in journal (Refereed)
  • 1061.
    Bahno, William
    et al.
    University West, School of Business, Economics and IT, Divison of Law, Economics, Statistics and Politics.
    Zymeri, Endrit
    University West, School of Business, Economics and IT, Divison of Law, Economics, Statistics and Politics.
    Investmentbankernas avstånd från insolvens: En analys av USA:s investmentbanker fram till och efter finanskrisen 2008.2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Financial crises in USA 2008 is seen as one of the worst crises in the last ninety years. Financial crises went hard on the American economy and abroad as a whole. Pressures under both administrations and rising house prices was one factor that led to the burst of house bubble in 2008. America has today eight financial institution seen as systemically important banks globally and holds a big market share in the US market. If one of these institution goes closer against bankruptcy, it can jeopardize the US and world economy as well. This thesis aims to analyze how the largest and systemically important investment banks operations could affect their distance from insolvency. With the data that is available, one has constructed and used a panel data to see and calculated Z-Score, with Z-Score as dependent and six independent variables over a time period of 17 years. In the panel regression the results show that comparing mean of Z-Score and predicted Z-Score, the values are similar and both follows a trend. This indicates that model used in thesis, belongs with Z-Score. The result showed that Z-Score for some banks were lower than normally under the financial crisis.

  • 1062.
    Bahramvalady, Mozhgan
    University West, Department of Health Sciences, Section for nursing - undergraduate level.
    Livskvalitet för patienter med kronisk obstruktiv lungsjukdom2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background: Chronic obstructive pulmonary disease is a growing problem today around the world. People are getting diagnosed with COPD everyday and the number of cases is expected to increase in the future. It is important that the nurse can respond to people living with COPD and to understand the symptoms and living condition of these people in order to apply a good nursing care.

    Aim: The aim of this study was to describe how quality of life is affected by chronic obstructive pulmonary disease (COPD).

    Method: The method of this study is based on a qualitative and quantitative research according to Friberg (2006) and Friberg (2012). Nine articles was analyzed according to Fribergs five-step model and results divided in three main themes.

    Results: The main themes were Symptom that limits everyday life, symptoms with a psychosocial impact and Relieving of symptoms that increases the quality of life.

    Conclusion: The results showed that COPD affects the entire life. To combine different treatment options such as applying oxygen, special breathing techniques and to increase the physical activity, it is possible to increase quality of life in COPD.

  • 1063.
    Bahtijari, Agon
    et al.
    University West, Department of Economics and IT, Division of Business Administration.
    Deyab, Mohammed
    University West, Department of Economics and IT, Division of Business Administration.
    Den nytillträdde verkställande direktörens möjlighet och incitament till Earnings Management2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The financial statements submitted by the companies will form the basis for various financial decisions taken by external stakeholders. This assumes that the information presented in these reports is valid and consistent with reality. However, the reliability and validity of these reports has been contested by previous studies whichmean that surrounding companies CEO turnover, both the incoming and the outgoing CEO have opportunities and incentives to Earnings Management. The possibility of Earnings Management arises as the International Financial Reporting Standards (IFRS), as a principle-based accounting system, creates scope for subjective assessments and estimates that can be utilized by the management to conduct Earnings Management. This opportunity is complemented by the management's opportunistic perspective and the seek after own interest. Against this background, the purpose of this study is to contribute knowledge if the newly appointed CEO conducts Earnings Management process, as well as whether the presence of Earnings Management surrounding CEO turnover is affected, depending on whether the newly appointed CEO is promoted from within or recruited outside the company. To carry out the survey, we have used a quantitative research method. The study contains 49 companies registered on the OMX Stockholmsbörsen Large Cap. All companies' annual reports have been analyzed between 2005 and 2015, which resulted in 539 observations. The study's result indicate that it can't be ensured that a newly appointed CEO conducts Earnings Management process. Nor can we be ensured that an external newly appointed CEO has greater opportunities for Earnings Management than an internal newly appointed CEO.

  • 1064.
    Bajraktari, Lirije
    et al.
    University West, Department of Economics and IT, Division of Business Administration.
    Abdallah, Rosanne
    University West, Department of Economics and IT, Division of Business Administration.
    Konflikter och kommunikation: Hur konflikter och kommunikation hanteras på en arbetsplats2015Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [sv]

    Vi valde att göra en undersökning på en skola inom kommunen i Trollhättan som heter Kronan. Studien handlar om hur man hanterar konflikter på arbetsplatsen och hur kommunikationen påverkar konflikterhanteringen. Till hjälp av vår studie ville vi få besvarat på hur konflikter sköts och hur kommunikationen kan leda till konflikter för att kunna få inblick på hur detta kan hanteras på bästa sätt. För att få hjälp med undersökningen kontaktade vi Kronan för att utföra vår undersökning. Vi har utgått från en kvalitativ metod och valt att intervjua fem anställda på organisationen angående deras syn på ämnet. För att kunna genomföra vår studie har vi utnyttjat oss av litteratur för att jämföra med resultaten från våra intervjuer. Resultatet från vår undersökning visade att konflikter inte trängs bort utan det hanteras till en bättre arbetsmiljö där kommunikation har en stor påverkan. De anställda väljer att hantera konflikterna på olika sätt, vissa väljer att låta individerna sköta problemen själva medan andra väljer att försöka lägga sig och hantera konflikterna på direkten.

  • 1065.
    Bajwa, Humera
    et al.
    University West, Department of Economics and IT, Division of Business Administration.
    Karawan, Liza
    University West, Department of Economics and IT, Division of Business Administration.
    Ledningens roll i arbetsmiljön: En studie inomhemtjänsten2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Vårdens styrning måste väsentligt förbättras samt utvecklas, det allvarligaste problemet ledningen handskas med inom äldreomsorgen är det faktum att personalens ansvar gällande arbetsprestationen är otydlig samt att det finns en brist på återkoppling gällande utfört arbete. Det saknas konkreta insatser som kan implementeras för att förbättra personalens arbetsvillkor. Detta leder i sin tur till att personalen är omotiverade i sitt arbete. Utifrån ovan diskuterade perspektiv skapar äldreomsorgen en bild av att vara en dysfunktionell organisation. Problemet är att arbetsmiljön inte är särskilt bra inom äldreomsorgen då högsjukfrånvaro, brist på motivation, kommunikation samt konflikter är de vanligaste förutsättningar som skapar en dysfunktionell organisation.

    Syftet med studien var att undersöka ledarskapets roll i den dysfunktionella organisationen samt hur ledningen kan förbättra arbetsmiljön. Genom att kvalitativt intervjua sju personer, fyra enhetschefer samt tre medarbetare, kunde vi uppnå studiens syfte.

    I teoridelen definierade vi ledarskapets innebörd genom att presentera fyra olika ledarskapsstilar vilket är karismatiskt, transaktionellt, transformellt samt Laissez - faire ledarskap. Dessutom presenterades definitionen av arbetsmiljö samt friskfaktorer för att skapa en god arbetsmiljö. Därefter presenterade vi ledningens roll i att skapa en god arbetsmiljö genom att belysa faktorer som motivation, kommunikation samt konflikter.

    Det som framkom av studien var att ledningens har en väsentlig roll i att förbättra arbetsmiljön inom äldreomsorgen genom att implementera ett ledarskap som präglas av gemenskap, motivation samt kommunikation. Respondenterna ansåg även att återkoppling, varierande arbetsuppgifter, inre motivation samt att en god gemenskap är väsentlig för att skapa en tillfredställande arbetsplats.

  • 1066.
    Baker, Jay
    University West, Department of Nursing, Health and Culture, Divison of Caring Sciences, undergraduate level.
    Pain and embaressment: Patients' experience of pilonidal disease2015Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background:

    Pilonidal disease describes the occurrence of a cyst, abscess or sinus tract located near or on the natal cleft of the buttocks that contains hair and skin debris, it affects predominantly men and is notable for affecting relatively young patients (15-35 years) and having long healing time. Aim: This study will create a literature review of patients' experience of their post-surgical wounds after surgery for removal of pilonidal sinus tracts, abscess or cysts. By highlighting issues encountered by patients after surgery this study aims to provide nurses with insight as to the specific needs of this group of patients. Method: Literature review based on scientific articles. Eight articles were selected and analyzed. Articles were searched for in the databases; CINAHL, and Pubmed available through University West. Results: Results of this review formed two distinct categories. Firstly pain was identified as a category, this contained subcategories of; pain due to dressing change, sitting and walking post-operatively, pain and analgesia and post-operative pain due to differing operative technique. Secondly embarrassment was identified as a category, this divided into the subcategories of; embarrassment due to malodour and embarrassment connected to altered body image. Conclusion: Pain and embarrassment during extended healing periods may have a significant effect on a patients' quality of life. As the primary patient contact point due to frequent dressing changes, the nurse has the ability to improve patient experience through a combination of applied practice and patient education to improve personal wound

  • 1067.
    Bakraqi, Valon
    et al.
    University West, Department of Economics and IT, Divison of Informatics.
    Humed Darir, Yasir
    University West, Department of Economics and IT, Divison of Informatics.
    Användarvänlig interaktion med mobila enheter: En studie av centrala designprinciper för mobila enheter2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The background of this study presents the way that technology for mobile units has developed in a quick pace, which has led to an expansion of smartphone usage. While the smartphone usage has expanded, the websites hasn't followed the same development. The problematic discussion in this area deals with the difficulties of adapting interfaces from a stationary computer to the interface of a smartphone.

    Selected mobile sites from different airlines have been investigated, based on how user-friendly they are. The study aims to investigate the problems that can arise when airline sites are not user-friendly, and illustrate how the various design principles are applied in these selected websites. Previous research regarding this topic shows that it's difficult to adapt a website to a smartphone. The same design principles are required as for the ordinary websites, but they need to be performed in a stricter manner. Moreover, earlier research shows that usability is an important aspect in the design of the site for smartphones.

    A qualitative approach was applied in the study, where the approach to collect materials for the study has applied the method think aloud, and interviews have been conducted in order to gain a deeper understanding. The result of this study shows that the investigated mobile websites suffer of severly insufficient usability in regards to the investigated design principles and the principles of usability. It is crucial to apply design principles for good mobile usability to the areas that are important for the interaction between the website and the user. The website and its functions should adapt, depending on the device the user uses to browse the website. The website should not confuse the user and should always give feedback on the whereabouts of the user on the website.

  • 1068.
    Balachandramurthi, Arun Ramanathan
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Fatigue Properties of Additively Manufactured Alloy 7182018Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Additive Manufacturing (AM), commonly known as 3D Printing, is a disruptive modern manufacturing process, in which parts are manufactured in a layer-wise fashion. Among the metal AM processes, Powder Bed Fusion (PBF) technology has opened up a design space that was not formerly accessible with conventional manufacturing processes. It is, now, possible to manufacture complex geometries, such as topology-optimized structures, lattice structures and intricate internal channels, with relative ease. PBF is comprised of Electron Beam Melting (EBM) and Selective Laser Melting (SLM) processes.

    Though AM processes offer several advantages, the suitability of these processes to replace conventional manufacturing processes must be studied in detail; for instance, the capability to produce components of consistent quality. Therefore, understanding the relationship between the AM process together with the post treatment used and the resulting microstructure and its influence on the mechanical properties is crucial, to enable manufacturing of high-performance components. In this regard, for AM built Alloy 718, only a limited amount of work has been performed compared to conventional processes such as casting and forging. The aim of this work, therefore, is to understand how the fatigue properties of EBM and SLM built Alloy 718, subjected to different thermal post-treatments, is affected by the microstructure. In addition, the effect of as-built surface roughness is also studied.

    Defects can have a detrimental effect on fatigue life. Numerous factors such as the defect type, size, shape, location, distribution and nature determine the effect of defects on properties. Hot Isostatic Pressing (HIP) improves fatigue life as it leads to closure of most defects. Presence of oxides in the defects, however, hinders complete closure by HIP. Machining the as-built surface improves fatiguelife; however, for EBM manufactured material, the extent of improvement is dependent on the amount of material removed. The as-built surface roughness, which has numerous crack initiation sites, leads to lower scatter in fatigue life. In both SLM and EBM manufactured material, fatigue crack propagation is transgranular. Crack propagation is affected by grain size and texture of the material.

  • 1069.
    Balachandramurthi, Arun Ramanathan
    et al.
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Moverare, Johan
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. Linköping University, Department of Management and Engineering, Linköping, Sweden.
    Dixit, Nikhil
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Deng, Dunyong
    Linköping University, Department of Management and Engineering, Linköping, Sweden.
    Pederson, Robert
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Microstructural influence on fatigue crack propagation during high cycle fatigue testing of additively manufactured Alloy 7182019In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 149, p. 82-94Article in journal (Refereed)
    Abstract [en]

    A study of the microstructure of additively manufactured Alloy 718 was performed in order to better understand the parameters that have an influence on the fatigue properties of the material. The specimens were manufactured using two powder bed fusion techniques – Electron Beam Melting (EBM) and Selective Laser Melting (SLM). Four point bending fatigue tests were performed at room temperature with a stress ratio of R = 0.1 and 20 Hz frequency, on material that was either in hot isostatically pressed (HIP) and solution treated and aged (STA) condition or in STA condition without a prior HIP treatment. The grains in the SLM material in the HIP + STA condition have grown considerably both in the hatch and the contour regions; EBM material, in contrast, shows grain growth only in the contour region. Fractographic analysis of the specimens in HIP + STA condition showed a faceted appearance while the specimens in STA condition showed a more planar crack appearance. The crack propagation occurred in a transgranular mode and it was found that precipitatessuch as NbC, TiN or δ-phase, when present, did not affect the crack path. The areas with larger grains corresponded to the faceted appearance of the fracture surface. This could be attributed to the plastic zone ahead of the crack tip being confined within one grain, in case of the larger grains, which promotes single shear crack growth mode

  • 1070.
    Balachandramurthi, Arun Ramanathan
    et al.
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Moverare, Johan
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. Linköping University, Department of Management and Engineering, Linköping, Sweden.
    Dixit, Nikhil
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Pederson, Robert
    University West, Department of Engineering Science, Division of Welding Technology.
    Influence of defects and as-built surface roughness on fatigue properties of additively manufactured Alloy 7182018In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 735, p. 463-474Article in journal (Refereed)
    Abstract [en]

    Electron beam melting (EBM) and Selective Laser Melting (SLM) are powder bed based additive manufacturing (AM) processes. These, relatively new, processes offer advantages such as near net shaping, manufacturing complex geometries with a design space that was previously not accessible with conventional manufacturing processes, part consolidation to reduce number of assemblies, shorter time to market etc. The aerospace and gas turbine industries have shown interest in the EBM and the SLM processes to enable topology-optimized designs, parts with lattice structures and part consolidation. However, to realize such advantages, factors affecting the mechanical properties must be well understood – especially the fatigue properties. In the context of fatigue performance, apart from the effect of different phases in the material, the effect of defects in terms of both the amount and distribution and the effect of “rough” as-built surface must be studied in detail. Fatigue properties of Alloy 718, a Ni-Fe based superalloy widely used in the aerospace engines is investigated in this study. Four point bending fatigue tests have been performed at 20 Hz in room temperature at different stress ranges to compare the performance of the EBM and the SLM material to the wrought material. The experiment aims to assess the differences in fatigue properties between the two powder bed AM processes as well as assess the effect of two post-treatment methods namely – machining and hot isostatic pressing (HIP). Fractography and metallography have been performed to explain the observed properties. Both HIPing and machining improve the fatigue performance; however, a large scatter is observed for machined specimens. Fatigue properties of SLM material approach that of wrought material while in EBM material defects severely affect the fatigue life. © 2018 Elsevier B.V.

  • 1071.
    Balachandramurthi, Arun Ramanathan
    et al.
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Olsson, Jonas
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Snis, Anders
    Arcam EBM, SE-431 37, M€olndal, Sweden.
    Moverare, Johan
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. Department of Management and Engineering, Link€oping University, SE-581 83, Sweden.
    Pederson, Robert
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Microstructure tailoring in Electron Beam Powder Bed Fusion Additive Manufacturing and its potential consequences2019In: Results in Materials, ISSN 2590-048X, Vol. 1Article in journal (Refereed)
    Abstract [en]

    Electron Beam Powder Bed Fusion process for Alloy 718 was investigated, in the sense of microstructural evolution with varying process conditions. The existence of a geometric relationship between the melt front and the processing parameters was observed. By understanding and capitalizing on this relationship, it was possible to obtain columnar, equiaxed or bimodal microstructure.

  • 1072.
    Balachandramurthi Ramanathan, Arun
    et al.
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Moverare, Johan
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. Linköping University, Department of Management and Engineering, SE 581 83 Linköping, Sweden.
    Mahade, Satyapal
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Pederson, Robert
    University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
    Additive Manufacturing of Alloy 718 via Electron Beam Melting: Effect of Post-Treatment on the Microstructure and the Mechanical Properties.2018In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 12, no 1, article id E68Article in journal (Refereed)
    Abstract [en]

    Alloy 718 finds application in gas turbine engine components, such as turbine disks, compressor blades and so forth, due to its excellent mechanical and corrosion properties at elevated temperatures. Electron beam melting (EBM) is a recent addition to the list of additive manufacturing processes and has shown the capability to produce components with unique microstructural features. In this work, Alloy 718 specimens were manufactured using the EBM process with a single batch of virgin plasma atomized powder. One set of as-built specimens was subjected to solution treatment and ageing (STA); another set of as-built specimens was subjected to hot isostatic pressing (HIP), followed by STA (and referred to as HIP+STA). Microstructural analysis of as-built specimens, STA specimens and HIP+STA specimens was carried out using optical microscopy and scanning electron microscopy. Typical columnar microstructure, which is a characteristic of the EBM manufactured alloy, was observed. Hardness evaluation of the as-built, STA and HIP+STA specimens showed that the post-treatments led to an increase in hardness in the range of ~50 HV1. Tensile properties of the three material conditions (as-built, STA and HIP+STA) were evaluated. Post-treatments lead to an increase in the yield strength (YS) and the ultimate tensile strength (UTS). HIP+STA led to improved elongation compared to STA due to the closure of defects but YS and UTS were comparable for the two post-treatment conditions. Fractographic analysis of the tensile tested specimens showed that the closure of shrinkage porosity and the partial healing of lack of fusion (LoF) defects were responsible for improved properties. Fatigue properties were evaluated in both STA and HIP+STA conditions. In addition, three surface conditions were also investigated, namely the 'raw' as-built surface, the machined surface with the contour region and the machined surface without the contour region. Machining off the contour region completely together with HIP+STA led to significant improvement in fatigue performance.

  • 1073.
    Balaj, Adenis
    et al.
    University West, Department of Economics and IT, Divison of Informatics.
    Berg, Ronnie
    University West, Department of Economics and IT, Divison of Informatics.
    Konsekvenser vid införandet av automatiserade processer: Utifrån ett verksamhetsperspektiv2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this study, we investigated the consequences of implementing automated processes from an employee perspective. The study has been limited to Trollhättan Stad and their employees. We have investigated two different processes, which are "Grävningstillstånd" and "Avvikelser". Local activities aim today to conduct e-government, which includes automated processes. Automated processes can result in better work efficiency, but it may also require more technical expertise and skill of the staff. People can be an obstacle in the process, and it may mean that the process will take longer to be carried out. The study was conducted using a qualitative method where data collection occurred through interviews and document study. Six interviewees that all were employees in Trollhättan Stad in various administrations have been interviewed in this study. These interviews have been conducted in a semi-structured way. Search theory has been used through various search engines and databases. Interviewee's real names have been replaced with names of their roles in Trollhättan Stad, thus reducing the risk of information linked to a specific person. The theory chapter describes the first general information on e-government and collected information of the consequences of automated processes. We have determined that automated processes leads to better work efficiency, enables more control of tasks and that more cases are submitted. Automated processes can lead to increased costs, with the purchase of various services and goods at maintaining the system. Although in other areas of the organization it leads to cost savings. In some cases, the new systems require some education of the employees.

  • 1074. Balakrishnan, A.
    et al.
    Martin, C. L.
    Saha, B. P.
    Joshi, S.
    Modelling of compaction and green strength of aggregated ceramic powders2011In: Journal of the American Ceramic Society, Vol. 94, no 4, p. 1046-1052Article in journal (Refereed)
    Abstract [en]

    The behavior of aggregated ceramic powders is investigated using discrete element simulations. Aggregation (particles bonded by fused necks, resulting from calcination) is a common phenomenon observed during ceramic powder processing. In the present study, a small volume element of aggregated powder made of 40 spherical aggregates is modelled. Each aggregate comprises ∼500 spherical crystallites of 100 nm size. Mechanical interactions between crystallites are modelled to take into account strong bonds that form during calcination (with the possibility of breakage to model crushability), and adhesive contacts that form between submicrometer particles due to surface energy effects. The impact of having strongly bonded crystallites (high degree of calcination) or of having strongly adhesive particles (to mimic the use of a binder) is also investigated. Close die compaction and unloading from different compaction densities are carried out. It is observed that the final densification of the powder depends on the selection of process parameters like bond strength and work of adhesion between particles. This study also demonstrates a proportional relationship between the number of broken bonds in the green compacts and its strength. © 2010 The American Ceramic Society.

  • 1075. Balakrishnan, A.
    et al.
    Pizette, P.
    Martin, C. L.
    Joshi, S. V.
    Saha, B. P.
    Effect of particle size in aggregated and agglomerated ceramic powders2010In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 58, no 3, p. 802-812Article in journal (Refereed)
    Abstract [en]

    This work describes the compaction of agglomerated and aggregated ceramic powders with special emphasis on the role of primary particle size. Discrete element simulations are used to model weakly bonded agglomerates as well as strongly bonded aggregates. Crushing tests are carried out to obtain the characteristic strength of single agglomerate and aggregate. Microstructure evolution and stress-strain curves indicate that aggregates undergo a brittle to plastic-like transition as particle size decreases below 50 nm. It is shown that agglomerates made of nanoparticles exhibit much greater strength than those made of micron-sized particles, with an approximately inverse linear relationship with primary particle size. Simulation of the uniaxial compaction of a representative volume element of powder demonstrates that adhesive effects are responsible for the difficulty to compact nanopowders and for the heterogeneity of microstructure prior to sintering. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

  • 1076.
    Balalia, Alina
    et al.
    Academy of Economic Studies in Bucharest.
    Rauhut, Daniel
    Kungliga Tekniska Högskolan.
    Assessing TerritorialImpact Assessment: the Case of Services of General Interest2012Conference paper (Other academic)
  • 1077.
    Balder, Christina
    University West, Department of Social and Behavioural Studies, Division of Psychology, Pedagogy and Sociology.
    IT relaterad stress och personlighet: hur ser relationen mellan femfaktormodellen och IT relaterad stress ut?2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    We humans live in an increasingly digitized world and this affects both our private and working lives. Regardless of occupation, modern technology has resulted in a digitized work life. Even if the change that has happened within the latest years has resulted in what many would regard as positive aspects such as flexibility, availability and mobility, it is not a work situation that suits everyone.

    This study intended to investigate the associations between IT related stress in the working life and personality, based on the five-factor model (FFM). Previous research has established that out of the five personality traits that constitutes FFM, it is neuroticism and conscientiousness that has strong association with different forms of stress and stress-related phenomena.

    Data was collected from 170 participants using an online survey. The survey that the participants answered to consisted partly of a scale developed with the purpose of capturing IT related stress in work life and partly of a mini scale for FFM (IPIP30).

    The results showed, that the individuals least affected by IT related stress, or potential factors that affect how an individual copes with IT related stress, are individuals with high levels of conscientiousness.

  • 1078.
    Balder, Christina
    et al.
    University West, Department of Social and Behavioural Studies, Division of Psychology, Pedagogy and Sociology.
    Björkman, Therese
    University West, Department of Social and Behavioural Studies, Division of Psychology, Pedagogy and Sociology.
    Dark Triad: De mörka personlighetsdragen och upplevd stress2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In our time, stress is a factor that greatly influences our lives. Previous research has examined individual differences in relation to stress mainly through Costa and McCrae's (1985) five factor model (FFM). New research indicates that the current construct of Dark Triad consisting of narcissism, psychopathy and Machiavellianism needs further research. Research regarding the dark personality traits in relation to stress is limited. The purpose of the present study was to investigate possible correlations between the dark personality traits vulnerable narcissism and grandiose narcissism and psychopathy and Machiavellianism as well as the possible correlations between these dark personality traits and perceived stress. The number of participants was 346. The participants answered a questionnaire using different scales for each of the dark personality traits as well as one for perceived stress. PSS-10 for perceived stress, HSNS for vulnerable narcissism and NPI-13 for grandiose narcissism, EPA-SSF for psychopathy and MACH-IV for Machiavellianism. The results from the analyses show a significantly strong, positive correlation between vulnerable narcissism and perceived stress, as well as a negative correlation between grandiose narcissism and perceived stress. One conclusion of this study is that we suggest that narcissism should be treated as two separate personality traits in future research related to stress. The results also showed that we cannot draw any conclusions regarding differences between psychopathy and Machiavellianism in relation to perceived stress.Based on the results, we also suggest that primary and secondary psychopathy should be used in future research to investigate possible correlations between perceived stress.

  • 1079.
    Baldock, Karina
    University West, Department of Health Sciences, Section for nursing - graduate level.
    Anhörigas upplevelser av bemötande inom psykiatrisk vård: Den utfrysta anhöriggruppen2018Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background: Making people feel safe and secure in health care is one of the most importanttasks of nursing. A good response is not only important to patients but also to their relatives. Previously, for most of last century, relatives were not welcome to the psychiatric health care. But research show they are in need of information and support from the health care. It istherefore important that nursing staff learn what kind of response the relatives require.

    Aim: To investigate how relatives experience the response from nursing staff within thepsychiatric care.

    Method: Qualitative interviews with eight respondents, where the answers were transcribedand analysed to learn how they had experienced the response from nursing staff. In theanalysis the text was condensed and abstracted into subcategories and categories.

    Result: The analysis resulted in twelve subcategories and three categories; Feeling valued andmaking a difference, Feeling left out and not wanted, Response improvement suggestions.

    Conclusion: This study shows that relatives still to a large extent are left out fromparticipation in psychiatric care, although society has placed the main responsibility on themto support their next of kin. The result shows that relatives require more information andparticipation to be able to support their next of kin. Getting a good response from nursing caremeans for them to be seen, listened to and getting information and support. They don´t wantto be left out any more.

  • 1080.
    Balic, Adnan
    University West, Department of Social and Behavioural Studies, Division of Psychology and Organisation Studies.
    Chefers syn på motivation och hur de skapar motivation bland medarbetare i en teknisk verksamhet2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Motivation is a complex area and at the same time an important factor to create and maintain in workplaces. The purpose of this study is to investigate the managers' views on motivation and how they create motivation in a technical business. This essay examines how managers motivate their employees based on internal and external motivation aspects, and how they go about maintaining motivation in the workplace. This was done by using a qualitative method where interviews were conducted with four managers; three men and one woman. After the interviews were done, the material was analyzed by using a thematic analysis method. This analysis identified a number of concepts that the participants perceived to be important regarding external and internal motivation. The themes that emerged were job security, communications and development. These three themes were the basis of the motivational work, which the informants described as having different meanings for inner and outer motivation. The three themes in the results were according to the informants' important factors that need to be considered in motivational work. To have good communication with employees, and that the employees should feel safe at work, is a basis for how motivation occurs. Development was also an important theme since employees need to feel that they can develop in the workplace. This allows employees to strive after being more efficient, hence willing to learn new things.

  • 1081.
    Balina, Kranthi Kumar
    University West, Department of Engineering Science.
    Spring back behaviour of hole expansion with various punch movement and positions.2011Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A methodology for making a spring back behaviour of hole expansion in gas tank. Work is initiated for SAAb automobile and the geometry of model is created by using the software’s called Unigraphics and hyper mesh and secondly the simulation of the model is done in Ls-dyna to know the spring back behaviour of hole with various depth and positions of the punch. The yield strength of the element and stress, strain distribution and different radius of the blank are used to reduce the cracks at the lower edge of the blank. Steel material is used and the thickness of the material (0.229mm). The simulation of the work includes loading of punch and its displacement. This study demonstrates the efficiency of the model to simulate the hole expansion and better understanding of the expansion of radius and spring back angle.

  • 1082.
    Bancks, Ann-Sofie
    et al.
    University West, Department of Health Sciences, Section for nursing - graduate level.
    Ivarsson, Karin
    University West, Department of Health Sciences, Section for nursing - graduate level.
    Förutsättningar som behövs för att implementera personcentrerad vård inom Kommunal Hemsjukvård: En kvalitativ intervjustudie2017Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background According to the Swedish Association of Local Authorities and Regions should all healthcare professionals within the regions, municipalities and county councils work for an introduction of person-centered care, which will aim to promote good and equitable health care and to enhance patients and users as co-creators in their own care process.

    Aim The aim of this study was to describe the district nurses' perception of person-centered care and the conditions required to implement person-centered care in home care.

    Method A qualitative study was conducted using eleven face-to face interviews.

    Results The analysis showed that the district nurses perceive person-centered care was to have the person at the center when it comes to planning and implementation of health care. To achieve this goal the nurses declared the need for certain conditions. These are reported to be team work, support from the organization and patient involvement in their care.

    Conclusion All nurses in the study were positive to a person-centered care approach and basically they were aware of the meaning of the term. The district nurses who had recently undergone specialized training focusing on district nursing had a more scientifically based definition of what person-centered mean In relation to those with older training. The former appeared more likely to work on a basies of a person-centred approach and were more positive to develop such approach in health care.

  • 1083.
    Bandgren, Ann-Charlotte
    et al.
    University West, Department of Informatics and Mathematics.
    Ramadani, Suzana
    University West, Department of Informatics and Mathematics.
    Stressar e-post?2003Independent thesis Advanced level (professional degree)Student thesis
  • 1084.
    Bandgren, Lena
    et al.
    University West, Department of Technology, Mathematics and Computer Science.
    Eriksson, Maria
    University West, Department of Technology, Mathematics and Computer Science.
    Johansson, Annica
    University West, Department of Technology, Mathematics and Computer Science.
    Symbolbaserad interaktion i vården: ett komplement till VIPS2004Independent thesis Advanced level (professional degree)Student thesis
  • 1085.
    Bandic, Mia
    et al.
    University West, Department of Health Sciences, Section for health promotion and care sciences.
    Baban, Vian
    University West, Department of Health Sciences, Section for health promotion and care sciences.
    Attityder gentemot sexualförbrytare inom kriminalvården2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Professionals' attitude towards sex offenders is a field that requires more research. Former studies, made in other countries, have shown that the public and often even professionals have negative attitudes towards this type of offenders. In Sweden there is no previous study that investigates professionals' attitudes towards sex offenders. The aims of the present study were to describe the general perception of attitudes towards sex offenders among prison personnel in Sweden, and to investigate if these attitudes affect their professional work. Respondents in this study participated through a web based inquiry. The participants were professionals working closely with sex offenders. The results show that personnel with good knowledge about sex crimes are motivated in their work with sex offenders. Furthermore, the results also show that personnel are optimistic to treating individuals who have been convicted of sex offending. They also consider that attitudes, among the personnel, affect the treatment of the offenders and in that way it can also affect the nursing of them. Because of the low number of participants in this study, caused by a relatively great external dropout, one should be cautious in interpreting the results and not generalize the results to represent prison wards in Sweden.

  • 1086.
    Bandyopadhyay, Robi
    University West, Department of Technology.
    Modelling of the flame spraying process2003Report (Other (popular science, discussion, etc.))
  • 1087. Bandyopadhyay, S.
    et al.
    Gokhale, H.
    Sundar, J. K. S.
    Sundararajan, G.
    Joshi, S. V.
    A statistical approach to determine process parameter impact in Nd: YAG laser drilling of IN718 and Ti-6Al-4V sheets2005In: Optics and Lasers in Engineering, Vol. 43, no 2, p. 163-182Article in journal (Refereed)
    Abstract [en]

    The numerous unique advantages afforded by pulsed Nd:YAG laser systems have led to their increasing utility for producing high aspect ratio holes in a wide range of materials. Notwithstanding the growing industrial acceptance of the technique, the increasingly tighter geometrical tolerances and more stringent hole quality requirements of modern industrial components demand that "defects" such as taper, recast, spatter etc., in laser-drilled holes are minimized. Process parameters like pulse energy, pulse repetition rate, pulse duration, focal position, nozzle standoff, type of gas and gas pressure of the assist gas are known to significantly influence hole quality during laser drilling. The present study reports the use of Taguchi design of experiments technique to study the effects of the above process variables on the quality of the drilled holes and ascertain optimum processing conditions. Minimum taper in the drilled hole was considered as the desired target response. The entire study was conducted in three phases:(a) screening experiments, to identify process variables that critically influence taper in laser drilled holes, (b) Optimization experiments, to ascertain the set of parameters that would yield minimum taper and (c) validation trials, to assess the validity of the experimental procedures and results. Results indicate that laser drilling with focal position on the surface of the material being drilled and employing low level values of pulse duration and pulse energy represents the ideal conditions to achieve minimum taper in laser-drilled holes. Thorough assessment of results also reveals that the laser-drilling process, optimized considering taper in the drilled hole as the target response, leads to very significant improvements in respect of other hole quality attributes of interest such as spatter and recast as well. © 2004 Elsevier Ltd. All rights reserved.

  • 1088. Bandyopadhyay, S.
    et al.
    Sarin Sundar, J. K.
    Sundararajan, G.
    Joshi, S. V.
    Geometrical features and metallurgical characteristics of Nd: YAG laser drilled holes in thick IN718 and Ti-6Al-4V sheets2002In: Journal of Materials Processing Technology, Vol. 127, no 1, p. 83-95Article in journal (Refereed)
    Abstract [en]

    Laser drilling is increasingly becoming the method of choice for precision drilling of a variety of components, particularly in the aircraft industry. Notwithstanding the current level of acceptance of laser drilling in the aerospace industry, a number of defects such as spatter, recast and taper are associated with laser drilled holes and elimination of these defects is the subject of intense research. The present paper deals with Nd:YAG laser drilling of 4 and 8mm thick sections of IN718 and Ti-6Al-4V materials. The influence of type of material and its thickness, as well as parametric impact of key process variables like pulse frequency and pulse energy, have been determined. In the course of this study, relevant geometrical features of the drilled holes, like hole diameter and taper angle, have been comprehensively investigated. In addition, all metallurgical characteristics of interest, viz extent and nature of spatter, recast and heat-affected zone, have been evaluated. Effort has also been made to obtain some insights into the evolution of a through-thickness hole during laser percussion drilling of thick sections by careful experimentation involving monitoring the progression of the drilled hole with increasing number of laser pulses. Issues pertaining to variation of taper with depth of hole, change in crater depth with progressive drilling and specific energy consumption are also discussed. © 2002 Elsevier Science B.V. All rights reserved.

  • 1089. Banerjee, D.
    et al.
    Joshi, Shrikant V.
    Accuracy, Reliability and Reproducibility of Various Mechanical Test Techniques: Preface1996In: Transactions of the Indian Institute of Metals, ISSN 0019-493X, Vol. 49, no 5, p. R1-R2Article in journal (Other academic)
  • 1090.
    Bara, Enisa
    et al.
    University West, Department of Social and Behavioural Studies, Division for Educational Science and Languages.
    Masalcha, Nadine
    University West, Department of Social and Behavioural Studies, Division for Educational Science and Languages.
    Kommunikationens roll i arbetet med huvudräkningsstrategier: en granskning av ett läromedel i årskurs 1 – 32018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Bakgrund: TIMSS (Trends in International Mathematics and Science Study) är en studie som mäter elevers kunskaper i matematik och NO. Enligt TIMSS rapport (Skolverket, 2012) är matematikundervisningen i svenska skolor till störst del läroboksstyrd och matematikläroboken styr undervisningen i större utsträckning än i andra EU/OECD länder. Det innebär att det som avgör vad elever lär sig är vad läroboken har att erbjuda. TIMSS rapport visar också att svenska elevers resultat i matematik sjunker i jämförelse med andra länder. År 1991 avskaffades förhandsgranskningen av läromedel och idag ligger det på organisationen och/eller läraren att välja läromedel som leder till att elever utvecklar de förmågor som svarar mot kursplanen i matematik. I elevers utveckling av matematiska förmågor spelar kommunikationen en betydande roll (Ahlberg, 1995; Säljö, 2015). Syfte: Syftet med vår studie är att undersöka vilka uppgiftstyper elever får arbeta med genom samtalsbilderna som finns i elevböckerna Favorit matematik 1-3 samt vilka huvudräkningsstrategier elever i årskurs 1-3 ges möjlighet att utveckla i samma läromedel. Syftet är även att undersöka hur och i vilken utsträckning som uppgifterna och samtalsbilderna uppmanar eller inbjuder elever att kommunicera matematik verbalt. Slutligen vill vi undersöka om det finns någon progression mellan årskurserna 1-3 vad gäller huvudräkningsstrategier och uppgiftstyper. Metod: I studien har olika analysinstrument använts. Vi har valt att göra en innehållsanalys med en kvalitativ och kvantitativ del. Det innebär att även vårt analysinstrument utgörs av en kvalitativ del och en kvantitativ del. Den kvalitativa analysen handlar om att identifiera analysenheter och variabler och den kvantitativa delen avser hur frekvent varje variabel är. Resultat: Resultatet visar att elever får tillfälle att möta och pröva olika uppgiftstyper och huvudräkningsstrategier i arbetet med samtalsbilderna och de tillhörande frågorna i Favorit Matematik 1-3. Elever får dock inte möjlighet att utveckla sina matematiska förmågor i lika stor utsträckning via kommunikationen som rekommenderas i lärarhandledningen. Vad gäller progressionen för uppgiftstyp och strategi, finns det ingen jämn tillväxt eller minskning utan det ökar och minskar ojämnt.

  • 1091.
    Baradaran, Soheila
    et al.
    University West, Department of Social and Behavioural Studies, Division of Psychology, Pedagogy and Sociology.
    Fahlgren Persson, Ida
    University West, Department of Social and Behavioural Studies, Division of Psychology, Pedagogy and Sociology.
    Mindfulness hos äldre i relation till openness, ålder och kön2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Mindfulness is a phenomenon that has been studied over the past three to four decades. With the rapidly growing number of elderly people in today's society, we are faced with new challenges in order to find new ways to meet this target group and their needs so that they can feel a high quality of life even in this phase of life. Mindfulness can be a method for increasing the quality of life of the elderly suffering from both mental and physical disorders.

    In the present study, mindfulness has been studied and whether age and gender can predict the degree of mindfulness. The questions asked were: Are women more mindful than men? To what extent can openness, age and gender explain the degree of mindfulness of the respondents? Quantitative methods were used with a survey as the measuring instrument. The population examined was women and men over 65, of whom 164 were women and 68 were men.

    The result showed that there is no connection between mindfulness and age, or mindfulness and openness as well as no connection between mindfulness and gender. The result that emerged from the study is not in line with what previous research has found.

  • 1092.
    Barake, Manal
    et al.
    University West, Department of Social and Behavioural Studies.
    Hognert, Jenny-Anne
    University West, Department of Social and Behavioural Studies.
    Ny i klassen: en studie av hur elever med annat modersmål än svenska samspelar med lärare och andra elever2006Independent thesis Advanced level (professional degree)Student thesis
    Abstract [sv]

    Bakgrund: Vår studie utgår från det sociokulturella perspektivet vilket säger att barn lär sig handlingsmönster, begreppssystem, språk och värderingar i samspel med andra. Samspelet med omvärlden spelar stor roll för individens utveckling och inlärning. I ett sociokulturellt perspektiv sker lärandet genom interaktion och socialt samspel. Inbyggt i oss finns en social drift och därför är vi utrustade med en språk- och kommunikationsförmåga. Vi behöver kommunicera med varandra för att göra oss förstådda liksom för att förstå andra. Syfte: Syftet med vår studie är att belysa hur nya elever med ett annat modersmål än svenska som kommer nya från förberedelseklass till ordinarie klass, samspelar med lärare och andra elever i teoretiska respektive praktiska ämnen, samt vad samspelet har för innehåll och med vilka samspelet sker. Metod: Vi har gjort en kvalitativ undersökning i form av en fallstudie där vi använt oss av observation. Vi har observerat tre nya elever med ett annat modersmål än svenska i två olika klasser. Under observationens gång har vi använt oss av ett kategorischema. Resultat: Genom vår analys har vi funnit ett mönster i de teoretiska kontra de praktiska ämnena. Detta mönster visar att samspelet mellan elev-lärare och elev-elev är mer öppet och naturligt i de praktiska ämnena än i de teoretiska ämnena. Det öppna klimatet under de praktiska lektionerna inbjuder till ett naturligt samspel eleverna och elev-lärare emellan, vilket handlar mycket om allmänna ting och händelser. Klimatet, som ofta är lärarövervakat och lugnt och tyst under de teoretiska lektionerna påverkar samspelet, som då utformas i första hand från det aktuella ämnet och med bänkkamraterna

  • 1093. Barbosa da Silva, António
    et al.
    Berggren, IngelaUniversity West, Department of Nursing, Health and Culture, Division of Nursing.Nunstedt, HåkanUniversity West, Department of Nursing, Health and Culture, Division of Nursing.
    Omvårdnadshandledning: ur etiskt och tvärdisciplinärt pers2009Collection (editor) (Other academic)
  • 1094.
    Bardhi, Butrint
    et al.
    University West, Department of Social and Behavioural Studies, Division for Educational Science and Languages.
    Ranji, Alireza
    University West, Department of Social and Behavioural Studies, Division for Educational Science and Languages.
    Regeringskrisen 2018: En fallstudie om Sverigedemokraterna och de etablerade riksdagspartiernas politiska strategier2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Sedan valnatten den 9 september 2018 har ingen regeringskonstellation kunnat tillträda i Sverige. En jämn mandatfördelning mellan de traditionella blocken har resulterat i ett komplext parlamentariskt läge som utlöst en regeringskris.

    Ett riksdagsparti som tillhör ingetdera av de traditionella blocken är Sverigedemokraterna. Partiet är Sveriges yngsta riksdagsparti och utmanar de etablerade partierna (övriga riksdagspartier) med sin politiska sakfråga. För att få utökad politiskt inflytande ställer Sverigedemokraterna krav på att deras politiska sakfråga ska vinna gehör i den politiska arenan.

    Studien visar att de etablerade riksdagspartierna och Sverigedemokraterna möts i en strategisk maktkamp i regeringskrisen 2018. De etablerade partierna bemöter Sverigedemokraterna antingen genom att anta utmaningen i deras sakfråga och närma sig en snarlik politik, eller genom att inta en motsatt position till Sverigedemokraternas politiska sakfråga.

    Studien utgick ifrån ett fall med två kontexter. Kontexterna utgår ifrån en statsministeromröstning samt Sverigedemokraternas besked inför en budgetreservation.

  • 1095.
    Bardhi, Razije
    et al.
    University West, Department of Health Sciences, Section for nursing - graduate level.
    Björling, Sonja
    University West, Department of Health Sciences, Section for nursing - graduate level.
    Distriktsköterskors och diabetessköterskors erfarenheter av att möta patienter med diabetes som riskerar att få fotsår2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background:  Diabetes is one of the most common chronic diseases in the world and according to studies, the disease has a rapid development, especially type 2 diabetes that may be similar to an epidemic. Foot complications are among the most risky and costly late complications of diabetes mellitus. Neuropathy is the commonest complication and affects about half of all with diabetes. An important part of the preventive work of diabetes-related foot ulcers to provide both patient and family with knowledge, information and self-care education. Aim:  The aim of this study was to describe district nurse's and diabetic nurse's experience of meeting patients with diabetes who are at risk of foot ulcers Method:  The study had a qualitative approach. The study was based on individual interviews, with nine participants. Data analysis was then done using qualitative content analysis. Results:   The study resulted in four categories: conditions for a good start of a long-term relationship, different care depending on where the patient lives, the nurse as a mediator of knowledge and difficulties in preventive work. Conclusion:  This study shows that a large part of the preventive work is about self-care. It also appears that it is a challenge for nurses when patients do not want to take care of the advice and information they receive.

  • 1096.
    Bari, Mahdi
    University West, Department of Engineering Science, Division of Mechanical Engineering and Natural Sciences.
    A finite element study of shell and solid element performance in crash-box simulations2015Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis comprehends a series of nonlinear numerical studies with the finite element software's LS-Dyna and Impetus AFEA. The main focus lies on a comparative crash analysis of an aluminium beam profile which the company Sapa technology has used during their crash analysis.

    The aluminium profile has the characteristic of having different thickness over span ratios within the profile. This characteristic provided the opportunity to conduct a performance investigation of shell and solid elements with finite element analysis.

    Numerical comparisons were made between shell and solid elements where measurable parameters such as internal energy, simulation times, buckling patterns and material failures were compared to physical tests conducted prior to this thesis by Sapa technology.

    The performance investigation of shell and solid elements was initiated by creating models of the aluminium profile for general visualization and to facilitate the meshing of surfaces. The meshing procedure was considered to be an important factor of the analysis. The mesh quality and element orientations were carefully monitored in order to achieve acceptable results when the models were compared to physical tests.

    Preliminary simulations were further conducted in order to obtain a clear understanding of software parameters when performing crash simulations in LS-Dyna and Impetus AFEA. The investigated parameters were element formulations and material models. A general parameter understanding facilitated in the selection of parameters for actual simulations, where material failure and damage models were used.

    In conclusion, LS-Dyna was observed to provide a bigger internal energy absorption during the crushing of the beam with longer simulation times for solid elements when compared to shell elements. Impetus AFEA did on the other hand provide results close to physical test data with acceptable simulation times when compared to physical tests.

    The result difference obtained from the FE-software's in relation to physical crash experiments were considered to be varied but did indicate that shell elements were efficient enough for the specific profile during simulations with LS-Dyna. Impetus AFEA proved that the same time to be numerically efficient for energy approximations with solid elements refined with the third polynomial.

  • 1097.
    Baric, Velibor
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Mugisha, Arthur
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Elkvalitetsmätningar vid Högskolan Väst och kartläggning av hur elkvalitetsutredningar hanteras vid elnätbolag2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Today voltage quality is important in society, and with the constant continuing development of new modern technological products also makes people more demanding market and its products. This report describes the regulatory requirements on power quality and describe how a power quality works in practice. A clear written guidance on electrical connectivity have been performed in order to get clear instructions on how to connect today's instruments. Measurement has been conducted at University West for 24 hours using the school's equipment and with the help of an experienced supervisor. Furthermore, the report will include what affects the power quality and the consequences that may occur when there is poor power quality in the electricity grid. A distinction has been made on three network companies in Sweden of different size. The three network companies are Vattenfall AB, Göteborg Energi Nät AB and Trollhättan Energi AB. The survey has been done through interviews with officers and electrical engineers. The reason for this limitation is performed to find out if there are any established routines on how network companies handle customer complaints and unsatisfied customers. In addition, the report will describe the differences and similarities how these tree network company handled customer complaints. After interview with electricity suppliers can be concluded that there are few costumer complaints/cases per year from customer to the electricity supplier given how many customers it has. The result for measurement on voltage fluctuations, harmonics and flicker shows accordance with standards accepted values and it can be stated that University West has strong network.

  • 1098. Barick, P.
    et al.
    Prasad Saha, B.
    Mitra, R.
    Joshi, Shrikant V.
    Effect of concentration and molecular weight of polyethylenimine on zeta potential, isoelectric point of nanocrystalline silicon carbide in aqueous and ethanol medium2015In: Ceramics International, ISSN 0272-8842, E-ISSN 1873-3956, Vol. 41, no 3, p. 4289-4293Article in journal (Refereed)
    Abstract [en]

    The effect of dispersant concentration and its molecular weight on zeta potential of nanocrystalline silicon carbide in an aqueous medium was investigated. An increase in the concentration of the dispersant, such as polyethylenimine (PEI), in slurry prepared from nanosized silicon carbide, was found to augment the iso-electric point and zeta potential. However, the zeta potential was observed to decline as the pH of the slurry shifts towards the basic region. This aforementioned behavior is attributed to the enhanced mutual repulsion between the polymer chains of the dispersant adsorbed on the surfaces of SiC particles and those approaching the surfaces. The higher ionization potential of polymers in the acidic region compared to the basic region increases the adsorption. The relationship between zeta potential and pH is however, noted to remain virtually unchanged with molecular weight of PEI. Further, it is observed that zeta potential of SiC decreases with the increase in solid content of the slurry. Rheology study reveals that the ethanol based slurry has a lower viscosity than the water based slurry, making ethanol the preferred dispersing medium for colloidal processing of nanometric SiC powder. © 2014 Elsevier Ltd and Techna Group S.r.l.

  • 1099.
    Barick, Prasenjit
    et al.
    International Advanced Research Centre for Powder Metallurgy and New Materials, Balapur Post, Hyderabad, 500005 Telangana, India.
    Chakravarty, Dibyendu
    International Advanced Research Centre for Powder Metallurgy and New Materials, Balapur Post, Hyderabad, 500005 Telangana, India.
    Saha, Bhaskar Prasad
    International Advanced Research Centre for Powder Metallurgy and New Materials, Balapur Post, Hyderabad, 500005 Telangana, India.
    Nitra, Rahul
    Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721302 West Bengal, India.
    Joshi, Shrikant
    University West, Department of Engineering Science, Research Enviroment Production Technology West. International Advanced Research Centre for Powder Metallurgy and New Materials, Balapur Post, Hyderabad, 500005 Telangana, India.
    Effect of pressure and temperature on densification, microstructure and mechanical properties of spark plasma sintered silicon carbide processed with β-silicon carbide nanopowder and sintering additives2016In: Ceramics International, ISSN 0272-8842, E-ISSN 1873-3956, Vol. 42, no 3, p. 3836-3848Article in journal (Refereed)
    Abstract [en]

    The effects of applied pressure and temperature during spark plasma sintering (SPS) of additive-containing nanocrystalline silicon carbide on its densification, microstructure, and mechanical properties have been investigated. Both relative density and grain size are found to increase with temperature. Furthermore, with increase in pressure at constant temperature, the relative density improves significantly, whereas the grain size decreases. Reasonably high relative density (~96%) is achieved on carrying out SPS at 1300 °C under applied pressure of 75 MPa for 5 min, with a maximum of ~97.7% at 1500 °C under 50 MPa for 5 min. TEM studies have shown the presence of an amorphous phase at grain boundaries and triple points, which confirms the formation of liquid phase during sintering and its significant contribution to densification of SiC at relatively lower temperatures (≤1400 °C). The relative density decreases on raising the SPS temperature beyond 1500 °C, probably due to pores caused by vaporization of the liquid phase. Whereas β-SiC is observed in the microstructures for SPS carried out at temperatures ≤1500 °C, α-SiC evolves and its volume fraction increases with further increase in SPS temperatures. Both hardness and Young׳s modulus increase with increase in relative density, whereas indentation fracture toughness appears to be higher in case of two-phase microstructure containing α and β-SiC.

  • 1100.
    Barick, Prasenjit
    et al.
    International Advanced Research Centre for Powder Metallurgy and New Materials, Balapur Post, Hyderabad-500005, Telangana, India.
    Saha, Bhaskar Prasad
    International Advanced Research Centre for Powder Metallurgy and New Materials, Balapur Post, Hyderabad-500005, Telangana, India.
    Joshi, Shrikant
    University West, Department of Engineering Science, Research Enviroment Production Technology West. International Advanced Research Centre for Powder Metallurgy and New Materials, Balapur Post, Hyderabad-500005, Telangana, India.
    Mitra, Rahul
    Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, 721302, India.
    Spray-freeze-dried nanosized silicon carbide containing granules: Properties, compaction behaviour and sintering2016In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 36, no 16, p. 3863-3877Article in journal (Refereed)
    Abstract [en]

    Spherical granules comprising silicon carbide nanoparticles have been produced with the help of sprayfreeze-drying (SFD) technique. The effect of solid loading of slurries on rheological properties, flowability and morphology of the resulting SFD granules has been studied. Further, a systematic study has been performed to investigate the effect of applied pressures and granule density on the relative densities and microstructures of the green compacts. A marginal increase in viscosity is noted as the solid content of slurries increases from 5 to 15 vol% with significant increase in viscosity being observed in case of 18 vol% slurry. The granules prepared from SiC slurries are spherical in shape with their mean size, density, gravimetric flow rate, and yield strength increasing with the increase in solid content. The mechanical properties of sintered SiC produced from SFD granules are found relatively superior to that made from commercially available spray-dried (SD) granules.

19202122232425 1051 - 1100 of 10719
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf