• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 2912
  • 997
  • 610
  • 487
  • 177
  • 176
  • 128
  • 102
  • 84
  • 72
  • 59
  • 56
  • 48
  • 42
  • 19
  • Tagged with
  • 6868
  • 560
  • 524
  • 495
  • 480
  • 407
  • 402
  • 347
  • 338
  • 324
  • 307
  • 303
  • 298
  • 242
  • 235
  • 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.
241

Carbon Monoxide on Demand: Light-Induced CO Release of Flavonols

Anderson, Stacey N. 01 December 2018 (has links)
Carbon monoxide (CO) is an extremely useful molecule with applications in industrial manufacturing, synthetic procedures as a C1 building block, and as a potential pharmaceutical to produce anti-inflammatory effects and vasodilation. However, the toxicity associated with CO has prevented its full utilization. In order to safely handle CO, compounds and molecules have been developed that act as storage materials for the gas. Ideal storage platforms only release CO upon stimulation via a trigger. Light activation is the most desirable trigger as it can be regulated in terms of the intensity and the wavelength of light used. The majority of light-induced CO-storage platforms that have been reported to date consist of metal carbonyl compounds where CO is bound directly to a metal center. However, disadvantages inherent to this motif, such as potential toxicity associated with the metal and lack of characterization of CO release remnant(s), has pushed the research community to search for alternative CO storage structures. The research presented in this dissertation outlines our approach toward the development of safe-to-handle, light-induced CO release platforms. We use a flavonol structure similar to those found in fruits and vegetables, such as quercetin, as a light-induced CO release unit. Through changes in the structure of the flavonol and its surrounding environment in chemical compounds, we have found ways to strategically control the light-induced CO release reactivity of the flavonol. Chemical compounds developed in this project are of interest for studying the effects of CO in biological systems and applications in synthetic processes.
242

Perceived Roles of Academic Advisors in Pursuing Internationalization at Public State and Community Colleges in Florida

Long, Tony W. 14 November 2018 (has links)
This research study investigated the perceptions of academic advisors in the Florida College System (FCS) concerning globalization, internationalization, and their role in the process of internationalizing their colleges. Participants in the study included 54 academic advisors from 15 of the 28 colleges in the FCS. The sample was comprised primarily of female advisors with master’s degrees, who had been working in higher education for less than 13 years. This was a nonexperimental, quantitative study and analyses included descriptive statistics, ordinary least squares regression, and Pearson’s product moment correlations. The results revealed that the responding advisors believe that globalization is inevitable and good, and that colleges must prepare to face any challenges that result from it. They also indicated that the advisors thought colleges should engage in several strategies that could lead to progress in internationalization, including international exchanges of faculty and staff, study abroad opportunities for students, and the development of collaborative relationships between their college and foreign institutions. Advisors also indicated relatively strong support for the assertions that globalization and internationalization were important, and would continue to increase in importance going forward. They also generally agreed with the concept that academic advisors should be involved in the process of internationalization at their colleges, but their agreement in this instance was not as strong as it was when discussing globalization and internationalization more generally. In contrast, advisors did not as readily agree that students should take additional courses in foreign language, or that colleges should actively recruit foreign students. The majority of advisors also rejected the idea that the college should adopt a broad, international/global definition of diversity that includes language, customs, and ethnicity. They did not as readily envision the role of academic advisors in the process of internationalization to be as important or necessary as the overall concept of progress in the areas of internationalization and globalization. That is, advisors indicated more agreement with the theory, but not as much agreement with the practice, of internationalization as it relates to their job responsibilities.
243

Investigation of Bioactive Metabolites from the Antarctic Sponge <em>Dendrilla membranosa</em> and Marine Microorganisms

Witowski, Chris G. 10 April 2015 (has links)
Natural products continue to be a valuable source of compounds in research involving chemical ecology and drug discovery. Secondary metabolites are biosynthesized to benefit the host organism in its environment (feeding deterrence from predators, antibiotic properties to avoid infection, etc.) but these compounds also serve as useful scaffolds in drug discovery applications. The research herein describes both aspects of these two branches of natural products chemistry. The Antarctic sponge Dendrilla membranosa produces diterpenes, of which membranolide A, deters feeding of the predatory amphipod Gondogenia antarctica. A metabolomic study of several sponges was undertaken to determine environmental factors that govern the metabolism of D. membranosa. Habitat specificity, above or below the algal canopy, was a significant factor for the chemical clustering of sponges as well as the abundance of potential amphipod predators that are prevalent within the canopy. Another D. membranosa diterpene, aplysulphurin, undergoes degradation upon methanolic treatment to form the methoxy membranolides B-H. An investigation of these artifacts reveals potent activity against the leishmaniasis-causing parasite Leishmania donovani. Microorganisms also generate a significant number of bioactive natural products. Biotic and abiotic culture stressors such as co-culturing and epigenetic modification, respectively, will be explored to turn on cryptic biosynthetic pathways. These techniques are shown to produce unique secondary metabolites from cultures and further reinforce the one strain many compounds approach to the versatile and formidable microbial domain.
244

The Value of Information in Multi-Objective Missions

Brown, Shaun January 2008 (has links)
Master of Engineering (Research) / In many multi-objective missions there are situations when actions based on maximum information gain may not be the `best' given the overall mission objectives. In addition to properties such as entropy, information also has value, which is situationally dependent. This thesis examines the concept of information value in a multi-objective mission from an information theory perspective. A derivation of information value is presented that considers both the context of information, via a fused world belief state, and a system mission. The derived information value is used as part of the objective function for control of autonomous platforms within a framework developed for human robot cooperative control. A simulated security operation in a structured environment is implemented to test both the framework, and information value based control. The simulation involves a system of heterogeneous, sensor equipped Unmanned Aerial Vehicles (UAVs), tasked with gathering information regarding ground vehicles. The UAVs support an e ort to protect a number of important buildings in the area of operation. Thus, the purpose of the information is to aid the security operation by ensuring that security forces can deploy e ciently to counter any threat. A number of di erent local controllers using information based control are implemented and compared to a task based control scheme. The relative performance of each is examined with respect to a number of performance metrics with conclusions drawn regarding the performance and exibility of information value based control.
245

Driving preferences for co-branded products: effects of extendibility, compatibility and uncertainty

Lin, Song, Marketing, Australian School of Business, UNSW January 2010 (has links)
Firms frequently use brand extension strategies to enter new product categories. Another type of entry strategy is co-branding by effectively exploiting the equity of both constituent brands. Co-branding may effectively drive consumer preferences if consumers believe the combination of two brands offers a better solution than either one separately. However, there is also the risk that consumers may get confused with the combination, or have perceptions of strengths regarding one of the brands diluted, leading to the failure of this strategy. While much has been written on brand-category extension, despite its prevalence, the use of co-brands to enter a new category has attracted relatively little attention. In this study, the author models the effects on consumer perceptions and preferences of combining two brand names for a new product. The proposed model provides a mechanism to represent how consumers’ prior attribute beliefs about constituent brands, the extendibility of the brands into the extension category, the compatibility between the constituent brands, and the uncertainty associated with them can jointly determine their preferences for the co-branded product. The contribution that this model enables is a means to study co-branding and new category entry simultaneously, by assessing the drivers of consumer preference for a co-brand in a new product category. An empirical study is designed to test the model, using real brands and hypothetical extensions and co-brands. Theoretical contributions and managerial implications of this study are discussed.
246

Drinking coffee for a better world

Renström, Emma, Börjesson, Martina January 2010 (has links)
<p>In the beginning of the twenty-first century it became clear what consequences companies’pursuit of economical growth had created on our environment and our social lives. Now theworld is standing in front of a challenge and that is to find a sustainable way to produce,consume and live in order to help our environment and social lives. An example of anorganization that is working towards a sustainable way of living is Fair trade LabelingOrganizations International. They set up international fair trade standards in order to supportthe sustainable development of small producers in poor countries, such as ensuring that theproducers receive prices that cover their costs.Research results indicate that the fair trade label could lower the value of the brand that it isattached to, as well as decrease the original brand’s customer loyalty. While there is also thebelief that fair trade is a positive thing for a brand. Therefore our aim with this dissertation isto look at how the consumer behavior changes when the product is co branded with the fairtrade label. We will therefore look at how co branding with the fair trade label affect differentaspects of consumer behavior. The different aspects that we have used are need recognition,information search, evaluation of alternatives, post purchase behavior and perceived brandpersonality.The study is performed on Dutch consumers by doing a quantitative research. The studyshowed that there are four variables that affect consumer behavior when co branding with fairtrade these are price sensitivity, reason for buying, expected quality and perceived brandpersonality.This study contributes to the lack of research concerning the connection between co brandingwith fair trade and consumer behavior. The conclusions drawn from this study could be usedas guidelines for company managers that are thinking of adding a fair trade label to theproduct, but it could also be used as guidelines for managers that already use fair trade.</p>
247

Value Creation for Reforming Manufacturers : from goods-dominant logic to service-dominant logic

Luo, Licheng January 2009 (has links)
<p>Purpose – During the past decades, implementing reforms becomes a popular topic for most manufacturers. With the aim to cope with the environment changes, there are urgent needs for these manufacturing companies to carry on reforms on the existing businesses. At the same time, value creation under a new service dominant logic for manufacturers are cited by many scholars. The aim of this paper is to analyze the new dominant logic, with the comparison of traditional goods dominant logic, recognize the advanced value creation model. To go a step further, this paper also discusses about the way of implementing reforms and new business logic for manufacturers.</p><p>Methodology – This paper mainly takes the methodology of literature review. The literatures reviewed here include academic papers, books, and website information. The main field of literatures include: service definition and service characteristics; goods-dominant logic versus service dominant logic; and value creation (co-creation). On the other hand, some small case studies can also be found in this paper.</p><p>Findings – After the comparing between goods dominant logic and service dominant logic, this paper suggests the service-dominant logic as a preferred business logic. Because it provides a more interactive way of consumption, presents a value-in-use view rather than value-in-exchange, and requires manufacturers playing a role of assisting customers in value creating process. For those manufacturers wish to implement the service dominant logic, this paper suggests them to take innovations on their business, which including the innovations on products/services, business processes, and business models.</p><p>Research limitations/implications – As a relative new field of study, the research is mostly taken by literature review. However, the research on the implementing of new business logic and reforms requires more voice from the real industry.  </p><p>Practical implications – Manufacturers may position themselves to new roles by involving in the customers’ value creating process. Taking innovations from a integrated view may help manufacturers to achieve the higher value under service dominant logic.</p><p>Originality/value – This paper concluded the ongoing service dominant logic development, after which, offers a discussion on the implementing of which for the manufacturing companies.</p>
248

Hur påverkas Acers brand equity av co-branding med Ferrari?

Aronowitsch, Daniel, Hogman, Viktor, Noresson, Daniel January 2007 (has links)
<p>Den senaste tiden har en mängd samarbeten, eller så kallade co-brandings, mellan olika företags varumärken vuxit fram. Avsikten är att förstärka sitt eller sina varumärken med hjälp av ett annat varumärke som är förknippat med någonting unikt. Hur bedömer man resultatet av denna co-branding? Har det egna varumärket förstärkts eller har det försvagats? För att klargöra detta resultat måste varumärkets Brand Equity mätas. Med brand equity menas det kapital som varumärket representerar. I denna kvantitativa studie består respondenterna av ett kvoturval om 50 studenter. Vi har skapat ett mätinstrument för denna fallstudie utifrån Aakers modell för brand equity och dess fyra dimensioner; brand awareness, perceived quality, differentiation samt brand loyalty. Genom att undersöka hur Acers brand equity påverkas av co-branding med Ferrari genomför vi ett första preliminärt test av vårt mätinstrument.</p><p>Resultatet av vår undersökning visar på ett tydligt samband mellan Acers brand equity och cobranding. Vårt resultat visar tydligt att alla fyra dimensioner inom Acers brand equity har påverkats i positiv riktning i och med co-branding med Ferrari. Avslutningsvis ger vi även förslag till intressanta framtida studier inom detta område.</p>
249

Herbicide and Nutrient Effects on the Development of Gray Leaf Spot Caused by Pyricularia grisea on Tall Fescue

Gregg, John Patrick 08 July 2004 (has links)
Gray leaf spot, induced by <I>Pyricularia grisea</I>, is a disease of increasing importance in tall fescue in the southeastern United States. Previous research has shown that several herbicides may predispose turfgrasses to some diseases and that certain essential nutrients may have antagonistic effects on fungal plant pathogens. The objectives of this research were to evaluate the effects of herbicide and nutrient treatments on gray leaf spot development in tall fescue. Inoculation techniques were also evaluated for establishing gray leaf spot on tall fescue in controlled environments. Field studies revealed that 2,4-D applications resulted in significantly higher quality turf and lower gray leaf spot incidence than the untreated control. Turf treated with 2,4-D amine + mecoprop + dicamba also exhibited significantly less foliar blight symptoms than the untreated control. In vitro experiments revealed the growth-inhibiting effects of 2,4-D on <I>P. grisea</I> implicated in the field, as mycelial growth was completely inhibited at concentrations of 500 and 1000 mg L<sup>-1</sup>. Colony growth was not affected at 2,4-D concentrations up to 100 mg L<sup>-1</sup>. Phosphorous acid treatments resulted in a reduction in turf quality compared to an untreated control, as did manganese and zinc treatments. Foliar blight caused by P. grisea was substantially increased in H<sub>3</sub>PO<sub>3</sub>-treated plots in 2003, where a 40% difference in blighted turf was observed between plots that received H<sub>3</sub>PO<sub>3</sub> treatments every 14 days and the untreated control. Area under the disease progress curve (AUDPC) analysis also revealed the significant detrimental effects of the phosphorous acid treatments. No significant differences in disease incidence or leaf spot size among nutrient treatments were observed in greenhouse treatments. Isolate selection was a significant factor for disease development and leaf spot size following spray inoculation under optimal environmental conditions. In general, disease incidence increased as inoculum density increased. Placing plants in covered containers or plastic bags immediately following inoculation for a 24-h period also appeared to promote disease development. Seeding rate did not have a significant effect on gray leaf spot development. We conclude that herbicide applications do not predispose tall fescue to gray leaf spot development and that applications of nutrients alone do not suppress development of gray leaf spot in tall fescue. Adjusting cultural practices as additional control measures for gray leaf spot does not appear to be a successful approach to managing this increasingly important disease.
250

Population Dynamics of Rhizoctonia Species in Tall Fescue and Creeping Bentgrass in Response to Disease Management Programs

Lee, David Jackson 19 July 2004 (has links)
<I>Rhizoctonia</I> species are important pathogens of all turfgrasses, yet little is known about the structure of populations of these pathogens or the effect of disease control programs on population dynamics. Isolates of <I>Rhizoctonia</I> were obtained from a single creeping bentgrass putting green in 2002 and 2003 and from multiple tall fescue landscapes in 2003. Creeping bentgrass isolates were obtained by placing 5 mm soil cores on alkaline water agar, incubated at ~24 C for 1 to 2 days and the actively growing hyphae were transferred to potato dextrose agar (PDA). Tall fescue isolates were obtained from foliar lesions using the same procedures. Isolates were characterized using morphological characteristics, anastomosis reactions, nuclear staining, and ribosomal DNA (rDNA) sequences. From creeping bentgrass, 21 distinct clones of <I>R. solani</I> AG 2-2 IIIB were present in the sample population in 2002. Seven of these clones were also recovered on multiple sampling dates. Fifteen of the 21 clones from 2002 were recovered in 2003. All seven clones that were isolated in multiple sampling dates in 2002 were also recovered in 2003. There were 29 and 21 isolates of <I>R. zeae</I> collected from the sample population in 2002 and 2003, respectively. All 21 clones exhibited similar EC<sub>50</sub> values to mancozeb, chlorothanlonil and azoxystrobin. Of 224 isolates collected from tall fescue during 2003, 88 were <I>R. solani</I> AG 1, 105 were binucleate <I>Rhizoctonia</I> CAG 1, 14 were <I>R. zeae</I>, two were <I>R. cerealis</I>, and 15 were not identified to species or AG. One hundred and seventy four of the isolates were assayed for sensitivity to the fungicides flutalonil, iprodione, tebuconazole, and trifloxystrobin. Mean EC<sub>50</sub> values varied across fungicides and species, but generally were below 3.3 mg L<sup>-1</sup>. The diversity of <I>Rhizoctonia</I> populations associated with tall fescue, and the range in fungicide sensitivities among species indicates that response to management programs may vary with location and environment. The effects of phosphorous acid on fungal growth, disease incidence and turfgrass quality was evaluated in vitro and in vivo. Mean EC<sub>50</sub> values of azoxystrobin (+SHAM) for <I>R. solani</I> 2-2 IIIB, and AG 1, <I>P. aphanidermatum</I>, and <I>R. zeae</I> were 1.27, 0.04, 0.012, and 0.145 mg L<sup>-1</sup>, respectively. Applications of phosphorous acid to creeping bentgrass and tall fescue did not significantly reduce brown patch incidence or increase turfgrass quality in field or greenhouse experiments. The benefit of phosphorous acid as a fungicide or plant nutrient is questionable.

Page generated in 0.0431 seconds