Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "LAR1:lu ;lar1:(hh)"

Sökning: LAR1:lu > Högskolan i Halmstad

  • Resultat 1-10 av 517
Sortera/gruppera träfflistan
  • Abbas, Taimoor, et al. (författare)
  • A Measurement Based Shadow Fading Model for Vehicle-to-Vehicle Network Simulations
  • 2015
  • Ingår i: International Journal of Antennas and Propagation. - Hindawi Publishing Corporation. - 1687-5869. ; 2015
  • Tidskriftsartikel (refereegranskat)abstract
    • The vehicle-to-vehicle (V2V) propagation channel has significant implications on the design and performance of novel communication protocols for vehicular ad hoc networks (VANETs). Extensive research efforts have been made to develop V2V channel models to be implemented in advanced VANET system simulators for performance evaluation. The impact of shadowing caused by other vehicles has, however, largely been neglected in most of the models, as well as in the system simulations. In this paper we present a shadow fading model targeting system simulations based on real measurements performed in urban and highway scenarios. The measurement data is separated into three categories, line-of-sight (LOS), obstructed line-of-sight (OLOS) by vehicles, and non-line-of-sight due to buildings, with the help of video information recorded during the measurements. It is observed that vehicles obstructing the LOS induce an additional average attenuation of about 10 dB in the received signal power. An approach to incorporate the LOS/OLOS model into existing VANET simulators is also provided. Finally, system level VANET simulation results are presented, showing the difference between the LOS/OLOS model and a channel model based on Nakagami-m fading.
  • Afram, Basema, et al. (författare)
  • Predicting institutional long-term care admission in dementia: a mixed-methods study of informal caregivers' reports
  • 2015
  • Ingår i: Journal of Advanced Nursing. - Wiley-Blackwell. - 0309-2402. ; 71:6, s. 1351-1362
  • Tidskriftsartikel (refereegranskat)abstract
    • AimTo investigate agreement between: (1) expected reasons and actual reasons for admission of people with dementia according to informal caregivers; (2) scores on measurement instruments prior to admission and the actual reasons for admission according to informal caregivers. BackgroundTimely admission of people with dementia is a crucial issue. Information is highly warranted on whether informal caregivers are capable of prior identification of causes of admission and, can thus be considered a reliable prospective source on causes of admission. DesignA cohort study among informal caregivers of people with dementia who made a transition to institutional long-term care. MethodsQualitative data on the expected and actual reasons for admission were collected via open-ended questions at baseline and follow-up. Furthermore, at baseline, data were collected using measurement instruments to measure pre-admission characteristics. Interviews took place between November 2010-April 2012. After categorizing the answers, the agreement between the expected and actual reasons was calculated. Furthermore, bivariate associations were calculated between the actual reasons for admission and scores on corresponding measurement instruments. Results/FindingsFor most informal caregivers, there was agreement between their statements on the expected reason and the actual reason for admission. A third of the caregivers showed no conformity. Bivariate associations showed that there is also agreement between the actual reasons for admission and scores on corresponding measurement instruments. ConclusionInformal caregivers can be considered reliable sources of information regarding what causes the admission of a person with dementia. Professional care should anticipate informal caregivers' statements and collaborate with them to strive for timely and appropriate admission.
  • Aghaeipour, Mahtab, et al. (författare)
  • Comparative study of absorption efficiency of inclined and vertical InP nanowires
  • 2017
  • Ingår i: Physics, Simulation, and Photonic Engineering of Photovoltaic Devices VI 2017. - SPIE. - 9781510606395 ; 10099
  • Konferensbidrag (refereegranskat)abstract
    • Geometrically designed III-V nanowire arrays are promising candidates for optoelectronics due to their possibility to excite nanophotonic resonances in absorption spectra. Strong absorption resonances can be obtained by proper tailoring of nanowire diameter, length and pitch. Such enhancement of the light absorption is, however, accompanied by undesired resonance dips at specific wavelengths. In this work, we theoretically show that tilting of the nanowires mitigates the absorption dips by exciting strong Mie resonances. In particular, we derive a theoretical optimum inclination angle of about 30° at which the inclined nanowires gain 8% in absorption efficiency compared to vertically standing nanowires in a spectral region matching the intensity distribution of the sun. The enhancement is due to engineering the excited modes inside the nanowires regarding the symmetry properties of the nanowire/light system without increasing the absorbing material. We expect our results to be important for nanowire-based photovoltaic applications.
  • Aghaeipour, Mahtab, et al. (författare)
  • Considering symmetry properties of inp nanowire/light incidence systems to gain broadband absorption
  • 2017
  • Ingår i: IEEE Photonics Journal. - IEEE--Institute of Electrical and Electronics Engineers Inc.. - 1943-0655. ; 9:3
  • Tidskriftsartikel (refereegranskat)abstract
    • Geometrically designed III-V nanowire arrays are promising candidates for disruptive optoelectronics due to the possibility of obtaining a strongly enhanced absorption resulting from nanophotonic resonance effects. With normally incident light on such vertical nanowire arrays, the absorption spectra exhibit peaks that originate from excitation of HE1m waveguide modes in the constituent nanowires. However, the absorption spectra typically show dips between the absorption peaks. Conventionally, such weak absorption has been counteracted by either making the nanowires longer or by decreasing the pitch of the array, both alternatives effectively increasing the volume of absorbing material in the array. Here, we first study two approaches for compensating the absorption dips by exciting additional Mie resonances: 1) oblique light incidence on vertical InP nanowire arrays and 2) normal light incidence on inclined InP nanowire arrays. We then show that branched nanowires offer a novel route to achieve broadband absorption by taking advantage of simultaneous excitations of Mie resonances in the branches and guided HE1m modes in the stem. Finite element method calculations show that the absorption efficiency is enhanced from 0.72 for vertical nanowires to 0.78 for branched nanowires under normal light incidence. Our work provides new insight for the development of novel efficient photovoltaics with high efficiency and reduced active material volume.
  • Albinsson, John, et al. (författare)
  • Improved Tracking Performance of Lagrangian Block-Matching Methodologies Using Block Expansion in the Time Domain: In Silico, Phantom and in Vivo Evaluations.
  • 2014
  • Ingår i: Ultrasound in Medicine and Biology. - Elsevier. - 0301-5629. ; 40:10, s. 2508-2520
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of this study was to evaluate tracking performance when an extra reference block is added to a basic block-matching method, where the two reference blocks originate from two consecutive ultrasound frames. The use of an extra reference block was evaluated for two putative benefits: (i) an increase in tracking performance while maintaining the size of the reference blocks, evaluated using in silico and phantom cine loops; (ii) a reduction in the size of the reference blocks while maintaining the tracking performance, evaluated using in vivo cine loops of the common carotid artery where the longitudinal movement of the wall was estimated. The results indicated that tracking accuracy improved (mean = 48%, p < 0.005 [in silico]; mean = 43%, p < 0.01 [phantom]), and there was a reduction in size of the reference blocks while maintaining tracking performance (mean = 19%, p < 0.01 [in vivo]). This novel method will facilitate further exploration of the longitudinal movement of the arterial wall.
  • Aldrin, Viktor, 1980- (författare)
  • Bengt Ankarloo, Satans raseri
  • 2007
  • Ingår i: Kyrkohistorisk årsskrift. - Uppsala : Svenska Kyrkohistoriska Föreningen. - 0085-2619. ; 107:1, s. 295-296
  • Recension (övrigt vetenskapligt)
  • Aldrin, Viktor, 1980- (författare)
  • Eamon Duffy, Fires of Faith
  • 2011
  • Ingår i: Kyrkohistorisk årsskrift. - Uppsala : Svenska Kyrkohistoriska Föreningen. - 0085-2619. ; 111:1, s. 235-236
  • Recension (övrigt vetenskapligt)
  • Aldrin, Viktor, 1980- (författare)
  • Eamon Duffy, Marking the Hours
  • 2008
  • Ingår i: Kyrkohistorisk årsskrift. - Uppsala : Svenska Kyrkohistoriska Föreningen. - 0085-2619. ; 108:1, s. 187-188
  • Recension (övrigt vetenskapligt)
Skapa referenser, mejla, bekava och länka
  • Resultat 1-10 av 517
fritt online (200)
Typ av publikation
tidskriftsartikel (337)
konferensbidrag (68)
doktorsavhandling (35)
bokkapitel (33)
rapport (21)
recension (18)
visa fler...
samlingsverk (redaktörskap) (2)
bok (2)
licentiatavhandling (1)
visa färre...
Typ av innehåll
refereegranskat (389)
övrigt vetenskapligt (120)
populärvet., debatt m.m. (8)
Aldrin, Viktor, 1980 ... (29)
Samuelson, Lars, (28)
Gabrielsson, Jonas, ... (26)
Pettersson, Håkan, (25)
Fridlund, Bengt, (25)
Bergman, Stefan, 195 ... (25)
visa fler...
Bremander, Ann, 1957 ... (24)
Widén, Kristian, 197 ... (23)
Petersson, Ingemar F ... (23)
Karlsson, Staffan, 1 ... (18)
Rahm Hallberg, Ingal ... (18)
Pettersson, Håkan, 1 ... (17)
Karlsson, Staffan, (16)
Nygren, Jens Martin, ... (16)
Politis, Diamanto, 1 ... (16)
Pedersen, Eja, (14)
Saks, Kai, (12)
Zabalegui, Adelaida, (12)
Wengelin, Åsa (12)
Gustafsson, Kristina ... (12)
Persson, Anders, (11)
Jacobsen, Sten Eirik ... (10)
Bökberg, Christina, (10)
Hallberg, Ingalill R ... (10)
Nilsson, Peter, (9)
Verbeek, Hilde, (9)
Leino-Kilpi, Helena, (9)
Svedberg, Petra, 197 ... (9)
Ahlström, Gerd, (9)
Hansson, Lars, (9)
Jacobsson, Lennart T ... (9)
Borgström, Magnus T. ... (9)
Hertz, Erik, 1956-, (9)
Persson, Anders, 195 ... (9)
Soto, Maria, (8)
Hansson, Bengt, 1943 ... (8)
Hallberg, Ingalill R (8)
Svensson, Bengt (8)
Arvidsson, Barbro, (8)
Lindholm Dahlstrand, ... (8)
Politis, Diamanto, (8)
Haglund, Emma, 1970- ... (8)
Lethin, Connie, (8)
Huse, Morten (8)
Jain, Vishal, 1989-, (8)
Renom-Guiteras, Anna ... (7)
Stephan, Astrid (7)
Gabrielsson, Jonas, (7)
Petersson, Håkan, 19 ... (7)
Ronning, Carsten, (7)
visa färre...
Lunds universitet (517)
Göteborgs universitet (54)
Högskolan i Borås (34)
Linköpings universitet (31)
Högskolan i Jönköping (29)
visa fler...
Linnéuniversitetet (25)
Karolinska Institutet (12)
Chalmers tekniska högskola (8)
Uppsala universitet (8)
Högskolan Kristianstad (8)
Örebro universitet (7)
Högskolan i Gävle (4)
Karlstads universitet (4)
Mälardalens högskola (4)
Sophiahemmet Högskola (3)
Umeå universitet (3)
Högskolan Dalarna (2)
Malmö universitet (2)
RISE (2)
Kungliga Tekniska Högskolan (2)
Mittuniversitetet (2)
Luleå tekniska universitet (2)
Blekinge Tekniska Högskola (2)
Högskolan Väst (1)
Sveriges Lantbruksuniversitet (1)
visa färre...
Engelska (439)
Svenska (77)
Norska (1)
Forskningsämne (UKÄ/SCB)
Medicin och hälsovetenskap (195)
Samhällsvetenskap (161)
Humaniora (89)
Naturvetenskap (88)
Teknik (87)


pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy