Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "LAR1:cth ;lar1:(hig)"

Sökning: LAR1:cth > Högskolan i Gävle

  • Resultat 1-10 av 16
  • [1]2Nästa
Sortera/gruppera träfflistan
  • Amin, Shoaib, et al. (författare)
  • Behavioral Modeling and Linearization of Crosstalk and Memory Effects in RF MIMO Transmitters
  • 2014
  • Ingår i: Ieee Transactions on Microwave Theory and Techniques. - 0018-9480. ; 62:4, s. 810-823
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper proposes three novel models for behavioral modeling and digital pre-distortion (DPD) of nonlinear 2 x 2 multiple-input multiple-output (MIMO) transmitters in the presence of crosstalk. The proposed models are extensions of the single-input single-output generalized memory polynomial model. Three types of crosstalk effects were studied and characterized as linear, nonlinear, and nonlinear & linear crosstalk. A comparative study was performed with previously published models for the linearization of crosstalk in a nonlinear 2 x 2 MIMO transmitter. The experiments indicate that, depending on the type of crosstalk, the selection of the correct model in the transmitter is necessary for behavioral modeling and sufficient DPD performance. The effects of coherent and partially noncoherent signal generation on the performance of DPD were also studied. For crosstalk levels of 30 dB, the difference in the normalized mean square error and adjacent channel power ratio was found to be 3-4 dB between coherent and partially noncoherent signal generation.
  • Arghand, Taha, et al. (författare)
  • An experimental investigation of the flow and comfort parameters for under-floor, confluent jets and mixing ventilation systems in an open-plan office
  • 2015
  • Ingår i: Building and Environment. - 0360-1323. ; 92, s. 48-60
  • Tidskriftsartikel (refereegranskat)abstract
    • There is a new trend to convert the workplaces from individual office rooms to open offices for motivating money saving and better communication. With such a shift the ability of existing ventilation systems in meeting the new requirements is a challenging question for researchers. The available options could have an impact on workers' health in terms of providing acceptable levels of thermalcomfort and indoor air quality. Thus, this experimental investigation focuses on the performances of three different air distribution systems in an open-plan office space. The investigated systems were: mixing ventilation with ceiling-mounted inlets, confluent jets ventilation and underfloor air distribution with straight and curved vanes. Although this represents a small part of our more extensiveexperimental investigation, the results show that all the purposed stratified ventilation systems (CJV and UFAD) were more or less behaving as mixing systems with some tendency for displacement effects. Nevertheless, it is known that the mixing systems have a stable flow pattern but has the disadvantage of mixing contaminated air with the fresh supplied air which may produce lower performance and in worst cases occupants' illness. For the open-plan office we studied here, it will be shown that the new systems are capable of performing better than the conventional mixing systems. As expected, the higher air exchange efficiency in combination with lower local mean age of air for corner-mounted CJV and floor-mounted UFAD grills systems indicates that these systems are suitable for open-plan offices and are to be favored over conventional mixing systems.
  • Finnveden, Göran, et al. (författare)
  • Policy Instruments towards a Sustainable Waste Management
  • 2013
  • Ingår i: Sustainability. - Basel : MDPI AG. - 2071-1050. ; 5:3, s. 841-881
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of this paper is to suggest and discuss policy instruments that could lead towards a more sustainable waste management. The paper is based on evaluations from a large scale multi-disciplinary Swedish research program. The evaluations focus on environmental and economic impacts as well as social acceptance. The focus is on the Swedish waste management system but the results should be relevant also for other countries. Through the assessments and lessons learned during the research program we conclude that several policy instruments can be effective and possible to implement. Particularly, we put forward the following policy instruments: “Information”; “Compulsory recycling of recyclable materials”; “Weight-based waste fee in combination with information and developed recycling systems”; “Mandatory labeling of products containing hazardous chemicals”, “Advertisements on request only and other waste minimization measures”; and “Differentiated VAT and subsidies for some services”. Compulsory recycling of recyclable materials is the policy instrument that has the largest potential for decreasing the environmental impacts with the configurations studied here. The effects of the other policy instruments studied may be more limited and they typically need to be implemented in combination in order to have more significant impacts. Furthermore, policy makers need to take into account market and international aspects when implementing new instruments. In the more long term perspective, the above set of policy instruments may also need to be complemented with more transformational policy instruments that can significantly decrease the generation of waste.
  • Fritzin, J, 1900-, et al. (författare)
  • Linearity, intermodulation distortion and ACLR in outphasing amplifiers
  • 2013
  • Ingår i: 2013 IEEE MTT-S International Microwave Symposium Digest. - IEEE conference proceedings. - 978-146736176-7
  • Konferensbidrag (refereegranskat)abstract
    • The distortion from amplitude and phase imbalance in outphasing amplifiers is discussed. The relation between dynamic range (DR) and suppression of distortion is shown to approximately follow a simple linear relationship depending on the DR. Approximate relations between adjacent channel leakage power ratio (ACLR) for different kinds of commonly used communication signals and two-tone intermodulation distortion are given. Relations between loss in output power and reduction of DR as functions of duty cycle in switching-based outphasing amplifiers are also given. An approximate method to evaluate the possible performance of digital pre-distortion (DPD) is also given by considering a DPD capable of correcting all distortions except amplitude imbalance. The predicted performance is compared to the performance obtained using a DPD-model found in the literature. The results show that the method is in good agreement, demonstrating that the proposed method can be used for design and evaluation of predistorted outphasing amplifiers. 
  • Glaumann, Mauritz, et al. (författare)
  • Miljöklassning av byggnader : Slutrapport
  • 2008
  • Rapport (övrigt vetenskapligt)abstract
    • Den här rapporten presenterar en metod för att miljöklassa byggnader med avseende på energi, innemiljö och kemiska ämnen. Rapporten presenterar också några särskilda miljökrav för byggnader med eget VA-system.Det övergripande syftet med ett nationellt miljöklassningssystem är att bidra till en hållbar bygg- och fastighetssektor. Arbetet ska resultera i en praktiskt tillämpbar metod för miljöklassning av byggnader som är väl förankrad i byggsektorn och hos myndigheterna. En allmänt accepterad miljöklassning av yggnader kan bli ett starkt incitament för byggherrar, fastighetsägare, fastighetsförvaltare och bebyggelsens användare att påskynda en utveckling mot en miljöanpassad och hälsoinriktad byggsektor.En av de viktigaste utgångspunkterna för arbetet med att ta fram ett miljöklassningssystem har varit Bygga-bo-dialogens1 mål att alla nya hus och 30 procent av det befintliga byggnadsbeståndet ska vara miljöklassade senast år 2009. Denna ambition har medfört att enkelhet har varit ett viktigt mål för miljöklassningsarbetet. Balansen mellan trovärdighet ochenkelhet har varit viktigt för arbetet.
  • Gunnarsson, Bengt, et al. (författare)
  • Effects of biodiversity and environment-related attitude on perception of urban green space
  • 2016
  • Ingår i: Urban Ecosystems. - 1083-8155.
  • Tidskriftsartikel (refereegranskat)abstract
    • Green space in cities contributes to the quality of life for city dwellers, e.g., by increasing the opportunity for recreation. However, perception of urban green space is influenced by multiple factors. We investigated effects of biodiversity and environment-related attitudes on visual and auditory perceptions of urban green space. Field measurements of biodiversity were conducted in six sites across an urban gradient in Gothenburg, Sweden, and three categories of biodiversity—high, medium, low—were established. Households were sent a survey on aesthetic perception of urban green space, sound perception and the importance of trees and plants for the perception of bird species. Each respondent focused on the site that was located nearby. The environment-related attitudes comprised “Nature-oriented” and “Urban-oriented” persons and were based on participants’ own attitude estimations. It was shown that participants’ “subjective” aesthetic and sound-related perception of urban greenery were in line with the “objectively” measured subdivisions of high, medium and low biodiversity. So also were their estimations of the importance of trees and plants for perception of bird species in urban greenery, although differing only between high and medium/low biodiversity conditions. Persons rating themselves as highly nature-oriented were shown to give higher scores to urban green space aesthetics and to value greenery-related sounds higher, and to attach greater importance to trees and plants in their perception of bird species in urban greenery, than less nature-oriented persons. Highly urban-oriented persons compared to less urban-oriented persons did the same, but only regarding urban greenery-related aesthetics and sounds of nature. We conclude that environment-related attitudes influence perceptions of green space. Moreover, our findings support the idea that biodiversity per se also influences perceptions; people value green space significantly more with high than with low measured biodiversity. Urban planning needs to provide city inhabitants with green spaces that are species-rich, lush, varied and rich with natural sounds.
  • Kazmierczak, Karolina, et al. (författare)
  • An integrated analysis of ergonomics and time consumption in Swedish 'craft-type' car disassembly
  • 2005
  • Ingår i: Applied Ergonomics. - 00036870. ; 36:3, s. 263-273
  • Tidskriftsartikel (refereegranskat)abstract
    • Car disassembly is at the edge of extensive rationalisations due to increased legislative demands for recycling. This study focused on (1) assessing Current mechanical exposures (physical work loads) for comparison with future rationalised systems, with particular emphasis on time aspects, (2) analysing disassembly work in terms of time consumption and exposures in constituent tasks as defined by a loss analysis technique, and (3) predicting the consequences of car disassembly rationalisation for mechanical exposures. The study showed that disassembly implied pronounced circulatory loads, and that more walking and higher lumbar peak loads were found than in studies of assembly work. Value-adding tasks comprised 30% of the total working time, and implied higher postural exposures for the head, arm, trunk and wrist, as well as less opportunities to recover, as compared to non-value-adding tasks. Organisational-type rationalisations can be expected to increase the time spent in value-adding work, thus increasing local exposures for the average worker, while a concurrent increase in mechanisation level might reduce circulatory exposures, the amount of walking, and peak lumbar loads.
  • Landin, Per N., et al. (författare)
  • Two novel memory polynomial models for modeling of RF power amplifiers
  • 2015
  • Ingår i: International journal of microwave and wireless technologies. - 1759-0795. ; 7:1, s. 19-29
  • Tidskriftsartikel (refereegranskat)abstract
    • Two novel memory polynomial models are derived based on physical knowledge of a general power amplifier (PA). The derivations are given in detail to facilitate derivations of other model structures. The model error in terms of normalized mean square error (NMSE) and adjacent channel error power ratio (ACEPR) of the novel model structures are compared to that of established models based on the number of parameters using data measured on two different amplifiers, one high-power base-station PA and one low-power general purpose amplifier. The novel models show both lower NMSE and ACEPR for any chosen number of parameters compared to the established models. The low model errors make the novel models suitable candidates for both modeling and digital predistortion.
  • Ljunggren Söderman, Maria, et al. (författare)
  • Integrated economic and environmental assessment of waste policy instruments
  • 2016
  • Ingår i: Sustainability. - 2071-1050. ; 8:5
  • Tidskriftsartikel (refereegranskat)abstract
    • The need for new policy instruments supporting the on-going transition from end-of-pipe waste treatment to resource management has been recognized in European policy. Instruments need to be carefully assessed before implementation to promote the desired changes and avoid problem shifting. Mathematical models may assist policy makers in such assessments. This paper presents a set of soft-linked models for assessing the economic and environmental impacts of policy instruments for both the prevention and management of waste and discusses its strengths and limitations. Consisting of (1) a macro-economic model, (2) a systems engineering model for waste management and (3) a life cycle assessment model for waste management, the set is primarily suited to assessing market-based instruments and environmental regulations. Considerable resources were needed for developing and using the set, and there are clear limits as to what can be addressed. However, if only one of the models had been used, neither the range of instruments nor the scope of impacts would have been possible to cover. Furthermore, soft-linked models allow many disciplines to contribute within one harmonized framework. Such integrated assessments may become increasingly useful for continuing the implementation of policy for sustainable governance of society’s material resources. © 2016 by the authors.
  • Marcus, Lars, 1962-, et al. (författare)
  • Cognitive affordances in sustainable urbanism: contributions of space syntax and spatial cognition
  • 2016
  • Ingår i: Journal of Urban Design. - 1357-4809. ; 21:4, s. 439-452
  • Tidskriftsartikel (refereegranskat)abstract
    • Post-industrial societies impose new ecological challenges on urbanism. However, it is argued here that most approaches to sustainable urbanism still share the conception of the humans-environment relations that characterized modernism. The paper finds support in recent knowledge developments in social-ecological sustainability, spatial analysis and cognitive science to initiate a dialogue for an alternative framework. Urban form engages humans not only through physical activities, but also mentally through opportunities for learning and creation of meaning, thereby both reinforcing and impeding behaviours on a cognitive level. Against this background, it is proposed that what in cognition studies is termed ‘cognitive affordances’ could form the core of a new epistemological framework of the human-environment relation in sustainable urbanism.
Skapa referenser, mejla, bekava och länka
  • Resultat 1-10 av 16
  • [1]2Nästa
fritt online (5)
Typ av publikation
tidskriftsartikel (14)
rapport (1)
konferensbidrag (1)
Typ av innehåll
refereegranskat (15)
övrigt vetenskapligt (1)
Finnveden, Göran (3)
Ode Sang, Åsa, (2)
Svenfelt, Åsa, (2)
Fager, Christian, 19 ... (2)
Björklund, Anna, (2)
Ekvall, Tomas, (2)
visa fler...
Mathiassen, S E (2)
Winkel, J (2)
Händel, Peter, (2)
Hedblom, Marcus, (2)
Handel, P. (2)
Isaksson, Magnus, (2)
Eriksson, Ola, (2)
Arushanyan, Yevgeniy ... (2)
Barbé, Kurt, (2)
Sundqvist, Jan-Olov, (2)
Ljunggren-Söderman, ... (2)
Knez, Igor (2)
Gunnarsson, Bengt, (2)
Mathiassen, Svend Er ... (1)
Forsman, M (1)
Sundberg, Johan, (1)
Winkel, Jörgen, 1946 ... (1)
Afsardoost, Sepideh, ... (1)
Eriksson, Thomas, 19 ... (1)
Söderholm, Patrik (1)
Medbo, Lars, 1957-, (1)
Rönnow, Daniel, (1)
Amin, Shoaib, (1)
Landin, Per, (1)
Ronnow, D. (1)
Van Moer, Wendy (1)
Barthel, Stephan, (1)
Malmström, Tor-Göran ... (1)
Andersson, Johnny (1)
Gunnarsson, Ulrika (1)
Henriksson, Greger (1)
Wells, R (1)
Arghand, Taha, (1)
Karimipanah, Taghi, ... (1)
Awbi, Hazim, 1946-, (1)
Cehlin, Mathias, 197 ... (1)
Larsson, Ulf, 1966-, (1)
Linden, Elisabet, (1)
Glaumann, Mauritz (1)
Malmqvist, Tove (1)
Marcus, Lars, 1962-, (1)
Sörqvist, Patrik, (1)
Sandén, Björn, (1)
Erlandsson, Martin, (1)
visa färre...
Chalmers tekniska högskola (16)
Kungliga Tekniska Högskolan (5)
Göteborgs universitet (5)
Luleå tekniska universitet (2)
Lunds universitet (2)
Engelska (15)
Svenska (1)
Forskningsämne (UKÄ/SCB)
Teknik (14)
Naturvetenskap (4)
Samhällsvetenskap (4)
Medicin och hälsovetenskap (2)
Lantbruksvetenskap (2)
Humaniora (1)


pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy