• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1156
  • 243
  • 112
  • 110
  • 94
  • 46
  • 30
  • 29
  • 29
  • 26
  • 23
  • 18
  • 15
  • 5
  • 5
  • Tagged with
  • 2253
  • 645
  • 621
  • 550
  • 393
  • 347
  • 272
  • 247
  • 238
  • 165
  • 165
  • 164
  • 157
  • 157
  • 155
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Consumer-driven innovation : a photography case study

Crawford, Brad Thomas 30 September 2011 (has links)
The effects consumer-driven innovation can have on an industry can be difficult to quantify. In this thesis I seek to highlight their existence and underscore their influence by observing the historical impact of numerous innovations on modern technology and society. Using the photography industry as a case study, I will show how successful companies leverage consumers to increase profits and technological development. Companies unable or unwilling to adapt will struggle to maintain profits and become insignificant in the market place. It is also important to consider the enablement of customers by these manufacturers. Advancements in the primary industry as well as supporting industries can lead to variability in market growth and often stimulate societal changes. As consumer innovators progress towards production, it is increasingly important that manufacturers adapt and redefine their market presence. Consumers are a powerful force and represent more than financial capital. My research shows that creative companies can harness consumer energy and find opportunities in the intellectual capital of the crowd. / text
2

Effektiv applikationsutveckling med TDD – Test Driven Development

Goralczyk, Pawel, Nyström, Anders January 2008 (has links)
<p>Test Driven Development (TDD) är en utvecklingsteknik där testning ses som en</p><p>naturlig del i utvecklingsprocessen och där tillvägagångssättet hjälper utvecklaren att</p><p>sektionera upp programkoden till mindre och mer hanterbara delar. På så sätt ger</p><p>TDD utvecklare ett stöd under programmeringsfasen så att de får fram ren och</p><p>flexibel kod som är enkel att ändra och felsöka. TDD som teknik underlättar även</p><p>möjligheterna att utveckla koden inom den tidsram som finns i och med att</p><p>betungande testfaser, som i traditionella metodiker och tekniker kan bli</p><p>tidsavgörande, istället integreras som en naturlig del i utvecklingsprocessen. Syftet</p><p>med denna uppsats är att belysa de fördelar som finns med att använda TDD vid</p><p>utveckling av nya applikationer. Vi ska ge utvecklarna som är involverade i</p><p>programmeringsfasen argument till varför TDD bör tillämpas vid utveckling av</p><p>applikationer och hur TDD kan vara ett hjälpmedel för att uppnå en bättre</p><p>kodstruktur/design för applikationen. Vi gjorde undersökningen genom att ta fram</p><p>teori inom området och utföra intervjuer baserade på den framtagna teorin. Efter att</p><p>intervjuerna hade utförts, analyserades det material som framkommit. Slutligen</p><p>presenteras ett antal viktiga argument kring varför de tillvägagångssätt som beskrivs</p><p>inom TDD kan utgöra effektiviseringar under utvecklingsprocessen. Ett av</p><p>argumenten är att användandet av omfaktorering ger utvecklaren möjlighet att städa</p><p>upp och rensa sin kod, vilket minskar risken för onödig komplexitet i koden och gör</p><p>den mer lättförståelig. Andra utvecklare kan enkelt sätta sig in i koden och</p><p>vidareutveckla den, vilket medför värdefull transparens. Omfaktorering gör med</p><p>andra ord koden enklare och tydligare att läsa, både för den som har utvecklat koden</p><p>och för dem runtomkring.</p>
3

Effect of turbulent transport models and grid spacing on pans calculations of a lid-driven cavity

Murthi, Aditya 01 November 2005 (has links)
The three-dimensional lid-driven cavity flow is investigated at Reynolds Number(Re)=10,000 for a wide range of spanwise-aspect ratios of 3:1:1, 0.5:1:1, and 1:1:1 using the Partially Averaged Navier-Stokes(PANS) turbulence closure model. The PANS turbulence model is a variable resolution turbulence closure model, where the unresolved-to-total ratios of kinetic energy (fk) and dissipation (fe), serve as resolution control parameters. This study focuses on two main aspects of PANS: (i) the evaluation of Turbulent transport models and (ii) the effect of grid spacing on accuracy of the numerical solution. PANS calculations are tested against LES and experimental results of Jordan (1994), in terms of both qualitative and quantitative quantities. The main coclusions are are: (i) for a given fk value, the Zero-Transport model is superior to the Maximum-Transport model for unresolved dissipation, (ii) both models are adequate for unresolved kinetic energy, and (iii) for a given grid size, the results depend heavily on grid spacing especially for larger fk values.
4

PERFORMANCE EVALUATION OF A SOLAR   COOLING SYSTEM IN UAE – RAS AL KHAIMAH BY BOTH EXPERIMENT AND SIMULATION

Ssembatya, Martin January 2013 (has links)
In United Arab Emirates (UAE), a huge proportion of electrical energy consumed in buildings is used to run air conditioning equipments. This is because UAE’s climate is characterized by very high ambient temperatures and high humidity, especially during summer periods. There is need to promote air conditioning systems that are run by renewable energy based power because of the environment threats and energy security negative issues associated with conventional fossil fuel – energy powered systems. The huge buildings’ cooling loads occur during periods of high solar insolation; this creates a huge potential of using solar powered cooling systems for air conditioning applications. However, the solar air conditioning systems still face a number of challenges in UAE which include; the availability of cheap electricity from fossil fuel resources and lack of government incentives to promote renewable energy resources. In order to understand the potential of applying solar cooling systems for air conditioning applications versus conventional systems, there was a need to experimentally and/or theoretically evaluate the performance of pilot solar cooling systems in UAE.      In this project, the performance of a 10 TR solar cooling system in Ras Al Khaimah (RAK) Emirate of UAE was evaluated by both experiment and theoretical simulation. TRNSYS, a transient – systems simulation software that was developed by Solar Energy Laboratory – University of Winsconsin, was used for the purpose of the theoretical simulations of the system. The solar cooling absorption equipment used for this study is an R&amp;D system that was developed by CSEM – uae in RAK for the purpose of assessing the potential of applying solar cooling systems in UAE. The solar cooling system is based on absorption chilling technology run by hot water produced by a field of evacuated tube solar collectors. Experimental results were compared with TRNSYS – theoretical simulations results and areas of possible improvements in the solar cooling system were recommended. Results of the study show that the solar cooling system runs with a COP in the range of 0.60 – 0.80, with an average COP of 0.70. It was also observed that the inlet cooling and hot water temperatures to the absorption chiller have a huge impact on the performance of the solar cooling system. A need to isolate the absorption chiller hot water circuit from the hot water stratified tank by incorporation of a heat exchanger between the chiller and the stratified tank was also identified. This will help to improve the degree of stratification during the operation of the solar cooling system. Theoretical performance evaluation of the system using a typical TMY2 weather data shows that the system can meet its cooling requirement for at least eight (8) months of the year. In conclusion, this study has indicated that solar cooling for air conditioning application in UAE has a huge potential. However, further research is necessary to enable improvement of the performance of solar cooling systems and to assess the possibility of commercialization of such systems.
5

Effektiv applikationsutveckling med TDD – Test Driven Development

Goralczyk, Pawel, Nyström, Anders January 2009 (has links)
Test Driven Development (TDD) är en utvecklingsteknik där testning ses som en naturlig del i utvecklingsprocessen och där tillvägagångssättet hjälper utvecklaren att sektionera upp programkoden till mindre och mer hanterbara delar. På så sätt ger TDD utvecklare ett stöd under programmeringsfasen så att de får fram ren och flexibel kod som är enkel att ändra och felsöka. TDD som teknik underlättar även möjligheterna att utveckla koden inom den tidsram som finns i och med att betungande testfaser, som i traditionella metodiker och tekniker kan bli tidsavgörande, istället integreras som en naturlig del i utvecklingsprocessen. Syftet med denna uppsats är att belysa de fördelar som finns med att använda TDD vid utveckling av nya applikationer. Vi ska ge utvecklarna som är involverade i programmeringsfasen argument till varför TDD bör tillämpas vid utveckling av applikationer och hur TDD kan vara ett hjälpmedel för att uppnå en bättre kodstruktur/design för applikationen. Vi gjorde undersökningen genom att ta fram teori inom området och utföra intervjuer baserade på den framtagna teorin. Efter att intervjuerna hade utförts, analyserades det material som framkommit. Slutligen presenteras ett antal viktiga argument kring varför de tillvägagångssätt som beskrivs inom TDD kan utgöra effektiviseringar under utvecklingsprocessen. Ett av argumenten är att användandet av omfaktorering ger utvecklaren möjlighet att städa upp och rensa sin kod, vilket minskar risken för onödig komplexitet i koden och gör den mer lättförståelig. Andra utvecklare kan enkelt sätta sig in i koden och vidareutveckla den, vilket medför värdefull transparens. Omfaktorering gör med andra ord koden enklare och tydligare att läsa, både för den som har utvecklat koden och för dem runtomkring.
6

Research Topics On A Detachable Auxiliary Drive System For Manual Wheelchairs

Lai, Yu-Te 26 June 2003 (has links)
none
7

Effect of turbulent transport models and grid spacing on pans calculations of a lid-driven cavity

Murthi, Aditya 01 November 2005 (has links)
The three-dimensional lid-driven cavity flow is investigated at Reynolds Number(Re)=10,000 for a wide range of spanwise-aspect ratios of 3:1:1, 0.5:1:1, and 1:1:1 using the Partially Averaged Navier-Stokes(PANS) turbulence closure model. The PANS turbulence model is a variable resolution turbulence closure model, where the unresolved-to-total ratios of kinetic energy (fk) and dissipation (fe), serve as resolution control parameters. This study focuses on two main aspects of PANS: (i) the evaluation of Turbulent transport models and (ii) the effect of grid spacing on accuracy of the numerical solution. PANS calculations are tested against LES and experimental results of Jordan (1994), in terms of both qualitative and quantitative quantities. The main coclusions are are: (i) for a given fk value, the Zero-Transport model is superior to the Maximum-Transport model for unresolved dissipation, (ii) both models are adequate for unresolved kinetic energy, and (iii) for a given grid size, the results depend heavily on grid spacing especially for larger fk values.
8

Dynamics and Control of Multibody Cable-Driven Mechanisms with Application in Rehabilitation Robotics

Rezazadeh, Siavash Unknown Date
No description available.
9

Synthesis, kinematic modeling, parameter identification and control of a rehabilitation cable-driven robot

Ghasemalizadeh, Omid Unknown Date
No description available.
10

Studies of laser compression of high aspect ratio DT filled shells

Savage, Maura Christine January 1992 (has links)
No description available.

Page generated in 0.0328 seconds