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Namnlöst dokument

  • Hans Löfgren

A first order friction model for lubricated sheet metal forminglänk till annan webbplats
This paper presents the derivation of a first order friction model for lubricated sheet metal forming. Assuming purely plastic real contacts, Newton's law of viscosity, and a square root behavior of the hydrodynamic coefficient of friction with respect to the hydrodynamic Hersey parameter an analytic model is found. The model predicts the coefficient of friction as a function of the relative pressure, the relative Hersey parameter and the real contact coefficient of friction. Questions about local and global friction are raised in the validation of the model against flat tool sheet experiments. For some flat tool sheet experiments reasonable agreements are obtained assuming a rigid punch pressure distribution. The restricted number of user inputs makes the model useful in early tool design simulations. © 2018 The Authors. Published by Elsevier Ltd on behalf of The Chinese Society of Theoretical and Applied Mechanics

  • Eja Pedersen
  • K. Persson Waye

Audio-visual reactions to wind turbineslänk till annan webbplats
A cross sectional study with the aim of evaluating dose response relationships between noise exposure from wind turbines and subjective reactions was performed in a flat landscape in Sweden. The study area comprised 16 turbines. Subjective reactions were obtained by a questionnaire, which purpose was masked. The response rate was 69% (356 respondents). Outdoor noise levels (dBA) were calculated for each dwelling at 2.5 dB intervals. The results showed a significant dose response relationship between noise level and annoyance. The prevalence of noise annoyance was comparatively high. In the categories of greatest noise exposure 37.5-40 dBA and >40 dBA, 20% (95%Cl: ±12.4) and 36% (95%Cl: ±18.4) were very annoyed. The noise only explained part of the annoyance. Noise annoyance was also correlated to visual factors such as the respondents’ opinion of the turbines’ impact on the landscape. To further study interactions between noise annoyance and visual disturbance, the shadows from wind turbines (hours/year) were calculated for each respondent and used as dose for annoyance of shadows, but also as a variable when trying to explain noise annoyance. The results of the analysis and the possible interactions between audio and visual annoyance will be presented at the conference.

  • Susanne Teneberg
  • I. Leonardsson
  • H. Karlsson
  • P.-A. Jovall
  • J. Ångström
  • D. Danielsson
  • I. Näslund
  • A. Ljungh
  • T. Wadström
  • K.-A Karlsson

Lactotetraosylceramide, a novel glycosphingolipid receptor for Helicobacter pylori, present in human gastric epitheliumlänk till annan webbplats
The binding of Helicobacterpylori to glycosphingolipids was examined by binding of 35S-labeled bacteria to glycosphingolipids on thin-layer chromatograms. In addition to previously reported binding specificities, a selective binding to a non-acid tetraglycosylceramide of human meconium was found. This H. pylori binding glycosphingolipid was isolated and, on the basis of mass spectrometry, proton NMR spectroscopy, and degradation studies, were identified as Galβ3GlcNAcβ3-Galβ4Glcβ1Cer (lactotetraosylceramide). When using non-acid glycosphingolipid preparations from human gastric epithelial cells, an identical binding of H. pylori to the tetraglycosylceramide interval was obtained in one of seven samples. Evidence for the presence of lactotetraosylceramide in the binding-active interval was obtained by proton NMR spectroscopy of intact glycosphingolipids and by gas chromatography-electron ionization mass spectrometry of permethylated tetrasaccharides obtained by ceramide glycanase hydrolysis. The lactotetraosylceramide binding property was detected in 65 of 74 H. pylori isolates (88%) Binding of H. pylori to lactotetraosylceramide on thin-layer chromatograms was inhibited by preincubation with lactotetraose but not with lactose. Removal of the terminal galactose of lactotetraosylceramide by galactosidase hydrolysis abolished the binding as did hydrazinolysis of the acetamido group of the N-acetylglucosamine. Therefore, Galβ3GlcNAc is an essential part of the binding epitope.

  • Faisal Iddris
  • Suchunya Kangwansarankul

Has The Perception of Mobile Adverting Among Youth Changed?länk till annan webbplats
This paper examined the future relevance of mobile advertising by examining the perception of youth. Semi-structure interview method was used to collect data. Nineteen (19) in-depth interviews were conducted in a group of international participants.  The results show that most international students’ attitudes towards mobile advertising are negative. Therefore, the company’s ability to persuade consumers to see products or services after seeing the advertisements are not strong as most of them decided to ignore it. People also have a concern on privacy while online and it appears more on female participants than male participants Finally, even though the participants  hold negative perspective towards mobile advertising, they do not wish to upgrade the application or service to premium with an extra fee. They prefer to watch the advertisement video instead.

  • Karl Gunnar Hammarlund

Authentic assessment in history education : Emphasising the “usefulness” of historylänk till annan webbplats
As part of the so-called Bologna Process, syllabi in Swedish higher education have been revised and built around learning outcomes, focusing on skills and competencies, both generic and subject-specific. However, it can be questioned whether assessment practice have undergone corresponding changes.In this chapter I give examples of examination tasks set by History departments at Swedish universities and discuss to what extent they correspond with the learning outcomes for the courses. I also discuss the possibility to create "authentic assessment" tasks in order to better determine students' abilities and competencies of relevance in the field of History.

  • L-A Schwope
  • R. J. Friel
  • K. E. Johnson
  • R. A. Harris

Field repair and replacement part fabrication of military components using ultrasonic consolidation cold metal depositionlänk till annan webbplats
Timely repair and replacement of military components without degrading material properties offers tremendous opportunities for cost and schedule savings on a number of military platforms. Effective field-based additive manufacturing repair approaches have proven difficult to develop, as conventional additive metal deposition technologies typically include a molten phase transformation and controlled inert deposition environments. The molten stage of laser and electron beam based additive processes unfortunately results in large dimensional and microstructural changes to the component being repaired or re-fabricated. As a result, high residual stresses and unpredictable ductility profiles in the repair area, or the re-fabricated part, make the final product unsafe for redeployment. Specifically, the heat affected zone associated with traditional deposition-based repair methods can produce a low strength, non-homogenous region at the joint; these changes in the materials properties of the repaired parts are detrimental to the fatigue life, and are a major concern where cyclic loading is experienced. The use of solid state high power Ultrasonic Consolidation (UC) technologies avoids the liquid-solid transition complexity and creates a predictable “cold” bond. This method then allows for strong, homogenous structures to be manufactured and repaired in the field and opens the door for the use of high strength repair material that may reduce the frequency of future failure itself. In addition, UC further offers the opportunity to provide enhanced functionality and ruggedness to a component either during repair or from original manufacture by allowing the embedding of passive and functional elements into the new fabricated component or feature.

  • J. Li
  • A. Bournias-Varotsis
  • S. Masurtschak
  • R. J. Friel
  • R. A. Harris

Exploring the mechanical performance and material structures of integrated electrical circuits within solid state metal additive manufacturing matriceslänk till annan webbplats
Ultrasonic Additive Manufacturing (UAM) enables the integration of a wide variety of components into solid metal matrices due to a high degree of metal plastic flow at low matrix bulk temperatures. This phenomenon allows the fabrication of previously unobtainable novel engineered metal matrix components. The aim of this paper was to investigate the compatibility of electronic materials with UAM, thus exploring an entirely new realm of multifunctional components by integration of electrical structures within dense metal components processed in the solid-state. Three different dielectric materials were successfully embedded into UAM fabricated metal-matrices with, research derived, optimal processing parameters. The effect of dielectric material hardness on the final metal matrix mechanical strength after UAM processing was investigated systematically via mechanical peel testing and microscopy. The research resulted in a quantification of the role of material hardness on final UAM sample mechanical performance, which is of great interest for future industrial applications.

  • A. Goulas
  • D. S. Engstrom
  • R. J. Friel
  • R. A. Harris

Investigating the additive manufacture of extra-terrestrial materialslänk till annan webbplats
The Powder Bed Fusion (PBF) additive manufacturing process category, consists of a group of key enabling technologies allowing the fabrication of both intrinsic and complex structures for a series of applications, including aerospace and astronautics. The purpose of this investigation was to explore the potential application of in-space additive manufacturing/3D printing, for onsite fabrication of structures and parts, using the available extra-terrestrial natural resources as feedstock. This study was carried out by using simulants of terrestrial origin, mimicking the properties of those respective materials found extra-terram (in space). An investigation was conducted through material characterisation, processing and by powder bed fusion, and resultant examination by analytical techniques. The successful realisation of this manufacturing approach in an extra-terrestrial environment could enable a sustainable presence in space by providing the ability to build assets and tools needed for long duration/distance missions in deep space.

  • A. Bournias-Varotsis
  • R. J. Friel
  • R. A. Harris
  • D. S. Engstrom

Selectively anodised aluminium foils as an insulating layer for embedding electronic circuitry in a metal matrix via ultrasonic additive manufacturinglänk till annan webbplats
Ultrasonic Additive Manufacturing (UAM) is a hybrid Additive Manufacturing (AM) process that involves layer-by-layer ultrasonic welding of metal foils and periodic machining to achieve the desired shape. Prior investigative research has demonstrated the potential of UAM for the embedding of electronic circuits inside a metal matrix. In this paper, a new approach for the fabrication of an insulating layer between an aluminium (Al) matrix and embedded electronic interconnections is presented. First, an Anodic Aluminium Oxide (AAO) layer is selectively grown onto the surface of Al foils prior to bonding. The pre-treated foils are then welded onto a UAM fabricated aluminium substrate. The bonding step can be repeated for the full encapsulation of the electronic interconnections or components. This ceramic AAO insulating layer provides several advantages over the alternative organic materials used in previous works.

  • Thomas Lindgren
  • Magnus Bergquist
  • Sarah Pink
  • Martin Berg
  • Vaike Fors

Experiencing Expectations : Extending the Concept of UX Anticipationlänk till annan webbplats
This paper demonstrates the role of pre-product user experience (UX) in product design. For automotive companies, questions concerning how users will experience not yet available products is pressing - due to an increase in UX design for products, combined with a decrease in time-to-market for new products. Conventional UX research provides insights through investigating specific situated moments during use, or users’ reflections after use, yet cannot provide knowledge about how users will engage with not yet existing products. To understand pre-product UX we undertook a netnographic study of three people’s experiences of expecting and owning a Tesla car. We identified how modes of anticipation evolve before using the actual car, through online social interaction, creating a pre-product experience. The study offers a foundation for theorizing pre-product UX as socially generated anticipated UX, as well as insights for UX design in industry. © Springer International Publishing AG, part of Springer Nature 2018.

Sidan uppdaterad 2014-08-27