• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1516
  • 561
  • 213
  • 169
  • 79
  • 56
  • 44
  • 32
  • 12
  • 11
  • 10
  • 10
  • 8
  • 6
  • 5
  • Tagged with
  • 2877
  • 595
  • 494
  • 341
  • 339
  • 325
  • 274
  • 211
  • 203
  • 199
  • 196
  • 188
  • 185
  • 181
  • 177
  • 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.
421

Synthesis and Photophysical Properties of 3D Substituted Heterohelicenes and their Derivatives

Ying, Hu 05 November 2008 (has links)
No description available.
422

GENETIC AND BIOCHEMICAL ANALYSIS OF THE ROLE OF EXTRA SEX COMBS-LIKE IN POLYCOMB SILENCING IN DROSOPHILA MELANOGASTER

Kurzhals, Rebeccah Lynn 28 March 2006 (has links)
No description available.
423

NEW DIRECTIONS IN THE DESIGN OF MRI GRADIENT COILS

BAIG, TANVIR N. 25 January 2007 (has links)
No description available.
424

Polymer Films With Enhanced Through Thickness Optical Transmission and Compression Modulus with Electric Field Aligned Glass Fiber/Bubbles

Zhang, Xuan, ZHANG 07 June 2016 (has links)
No description available.
425

A numerical approach for the interfacial motion between two immiscible incompressible fluids

Wang, Jin 30 September 2004 (has links)
No description available.
426

Harmonic interval preference in twelve-tone composition: a comparison of theory and practice in Schoenberg's work

Anderson, Timothy Reges January 1999 (has links)
No description available.
427

Generation Z - en investering för framtiden? : En kvantitativ studie om påverkansfaktorerna för hållbarhet inom generation Z

Ljungwald, Tilda, Persson Rasic, Oscar January 2022 (has links)
Samhället står idag inför utmaningar kopplat till hållbarhet och hållbar utveckling. Samtidigt som individer förbättrar sin kunskap kring ämnet hållbarhet ökar pressen för företag att agera på ett mer hållbart vis i sin verksamhet. Det handlar om interna och externa påtryckningar som går i linje med den hållbarhetsutveckling som individerna i samhället utvecklat. Den generationen av individer som enligt tidigare forskning revolutionerat sin hållbarhetsmedvetenhet är generation Z. Generation Z är individer födda mellan 1995 och 2010 vilket i dag presenterar individer mellan 12-27 år. En framstående klimataktivist från generation Z är Greta Thunberg som genom sociala medier spridit sitt budskap på ett mer kraftfullt och lättillgängligt sätt än vad som tidigare skådats.  Studiens tar sin grund i att studera generation Z:s hållbarhetsmedvetenhet mer specifikt än tidigare. Genom att anta att tidigare forskning överensstämmer med verkligheten angående att generation Z är en hållbar generation undersöka och analysera vilka faktorer som kan påverka en individs hållbarhetsmedvetenhet samt intresse för att investera hållbart. De faktorer som användes som oberoende variabler var kön, utbildning och inkomst. Utifrån de oberoende variablerna skapades fem stycken olika hypoteser med grunden i hur kön, utbildning och inkomst kan komma att påverka de beroende variablerna hållbarhetsmedvetenhet samt intresse för hållbara investeringar.  I studien användes en kvantitativ metod som grundade sig i en enkätundersökning utskickad via sociala medier. Urvalet var slumpmässigt då respondenternas svar skulle vara representativt för hela generation Z. Enkäten utgår från frågor om hållbarhet samt investeringar. Svaren som inkom från studien tolkades sedan i programmet SPSS. Utifrån svaren studien presenterade framkom att det enbart var en faktor som påverkar en individs hållbarhetsmedvetenhet, vilket var utbildning. Det visade sig att en högre utbildningsnivå återspeglade en högre medvetenhet och kunskap inom ämnet hållbarhet. / Our society today is facing different challenges regarding the subject sustainability and sustainable development. Different corporations are under pressure from stakeholders who are expecting the companies to take responsibility for their actions. Both internal and external stakeholders are pressuring companies in line with the growing knowledge about sustainability. Generation Z is described as a special generation regarding sustainability. The generation are individuals born between 1995 and 2010 which means they are 12-27 years old. Greta Thunberg is a well-known environmentalist from generation Z who is spreading her words and messages through social media platforms.  This study is main focus is to investigate the sustainability knowledge regarding generation Z on a deeper way. By assuming that the previous research regarding generation Z and sustainability is trustworthy this study investigates and analyze which factors that is influencing an individual’s knowledge about sustainability and their interest in socially responsible investments. The factors that are being handled in the study are gender, education and income. Out of these three factors five different hypotheses were created to represent how gender, education and income affect the knowledge about sustainability and interest in socially responsible investment. The study is based on a quantitative method in the form of a survey. The survey was available on social media for the responders to answer. The sample was random to enable the sample to represent the whole population of generation Z. The answers from the survey were later on analyzed in the program SPSS. From the answer presented there could be seen that education was the only factor that presented a significant difference between the responders. It was clear to see that a higher education were connected to a better knowledge regarding sustainability.
428

Upplevelsebaserade fritidsaktiviteter för generation Z : En konceptutveckling för ungas delaktighet i Allhuset, Piteå

Lindberg, Britt-Marie, Sibelius, Malin January 2014 (has links)
The purpose of the study is to examine adolescents associated to generation Zs needs and desires of leisure in Piteå and then develop a concept for the design of how it can be done. This is due to an expressed need in Piteå Municipality of leisure activities for young people in parts of Allhuset. To create activities that attract generation Z, it is important to understand the generation Zs characteristics and have an understanding of today's experience society. We made use of action research and the learning process in order to identify the problem and talks have been held with three focus groups with participants in the generation Z. A concept for how the design of the activities can be done have been created. / <p>Validerat; 20140902 (global_studentproject_submitter)</p>
429

Experimental Characterization of Mode I Fracture Toughness of Reinforced Carbon Fiber Laminate with Nano-Cellulose and CNT Additives

Berry, Seth David 10 August 2016 (has links)
Effective treatment of carbon fiber components to improve delamination resistance is vital to the application of such materials since delamination is one of the biggest concerns regarding the use of composites in the aerospace sector. Due to the significant application benefit gained from increased stiffness to density ratio with composite materials, innovative developments resulting in improved through-thickness strength have been on the rise. The inherent anisotropy of composite materials results in an added difficulty in designing structural elements that make use of such materials. Proposed techniques to improve the through-thickness strength of laminar composites are many and varied; however all share the common goal of improving inter-laminar bond strength. This research makes use of novel materials in the field of wet flocking and Z-pinning. Cellulose nanofibers (CNFs) have already demonstrated excellent mechanical properties in terms of stiffness and strength, originating at the nano-scale. These materials were introduced into the laminate while in a sol-gel suspension in an effort to improve load transfer between laminate layers. The effect of CNFs as lightweight renewable reinforcement for CFRPs will be investigated. Carbon nanotube (CNT) additives were also considered for their beneficial structural properties. / Master of Science
430

Estimation of Required Restraint Forces in Z-Purlin Supported, Sloped Roofs Under Gravity Loads

Neubert, Michael Christopher 04 September 1999 (has links)
The current specification provisions for the prediction of lateral restraint forces in Z-purlin supported roof systems under gravity loads are in Section D3.1 of the 1996 AISI Cold-Formed Specification. The design equations contained in these provisions are empirical and based on statistical analysis. They were developed using elastic stiffness models of flat roofs and were verified by experimental testing. The provisions need refinement, because the treatment of roof slope and system effects is incorrect. Also, the current design provisions are based upon an assumed panel stiffness value, ignoring the significant difference in required restraint force that occurs when panel stiffness is varied. Therefore, a new restraint force design procedure, having a stronger reliance on engineering principles, is proposed. This new treatment of the static forces in Z-purlin roofs led to a more accurate method of addressing roof slope. Elastic stiffness models, with varying roof slope, panel stiffness, and cross-sectional properties, were used to develop the proposed procedure. The basis of the procedure is to determine the lateral restraint force required for a single purlin system and then extend this result to systems with multiple restrained purlin lines. Roof slope is incorporated into the calculation of the single purlin restraint force, which includes eccentric gravity loads and forces induced by Z-purlin asymmetry. The procedure includes a system effect factor to account for the observed nonlinear increase in restraint force with the number of restrained purlins. An adjustment factor varies the predicted restraint force depending on the shear stiffness of the roof panel. The proposed procedure applies to five bracing configurations: support, third-point, midspan, quarter point, and third-point plus support restraints. / Master of Science

Page generated in 0.0217 seconds