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  • 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.
820301

Seawater intrusion risks and controls for safe use of coastal groundwater under multiple change pressures

Mazi, Aikaterini January 2014 (has links)
In the era of intense pressures on water resources, the loss of groundwater by increased seawater intrusion (SWI), driven by climate, sea level and landscape changes, may be critical for many people living in commonly populous coastal regions. Analytical solutions have been derived here for interface flow in coastal aquifers, which allow for simple quantification of SWI under extended conditions from previously available such solutions and are suitable for first-order regional vulnerability assessment and mapping of the implications of climate- and landscape-driven change scenarios and related comparisons across various coastal world regions. Specifically, the derived solutions can account for the hydraulically significant aquifer bed slope in quantifying the toe location of a fresh-seawater sharp interface in the present assessments of vulnerability and safe exploitation of regional coastal groundwater.  Results show high nonlinearity of SWI responses to hydro-climatic and groundwater pumping changes on the landside and sea level rise on the marine side, implying thresholds, or tipping points, which, if crossed, may lead abruptly to major SWI of the aquifer. Critical limits of coastal groundwater change and exploitation have been identified and quantified in direct relation to prevailing local-regional conditions and stresses, defining a safe operating space for the human use of coastal groundwater. Generally, to control SWI, coastal aquifer management should focus on adequate fresh groundwater discharge to the sea, rather than on maintaining a certain hydraulic head at some aquifer location. First-order vulnerability assessments for regional Mediterranean aquifers of the Nile Delta Aquifer, the Israel Coastal Aquifer  and the Cyprus Akrotiri Aquifer show that in particular the first is seriously threatened by advancing seawater. Safe operating spaces determined for the latter two show that the current pumping schemes are not sustainable under declining recharge. / <p>The thesis was founded by two research programmes: NEO private-academic sector partnership and Ekoklim, a strategic governmental funding through Stockholm University</p><p>At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 3: Manuscript.</p><p> </p>
820302

Dicke narrowing and speed-dependent effects in dispersion signals : Influence on assessment of concentration and spectral parameters by noise-immune cavity-enhanced optical heterodyne molecular spectrometry / Dicke-avsmalning och hastighetsberoende effekter hos dispersionssignaler : Påverkan på bestämning av koncentration och spektrala parametrar genom brusimmun kavitetsförstärkt optisk heterodyn molekylär spektrometri

Wang, Junyang January 2013 (has links)
Laser spectroscopic techniques have, during the last decades, demonstrated an extraordinary capability for sensitive detection of molecular constituents in gas phase. Since spectra from such techniques constitute unique and characteristic signatures for each type of species, these techniques enable investigations of molecular structures as well as detection of the presence of species in a gas mixture. They are therefore used for a variety of application, from fundamental studies to the assessment of gas concentrations. In fact, quantitative assessments of gas concentrations by laser-based techniques are constantly gaining in popularity, primarily due to properties such as high sensitivity and selectivity and an ability to perform non-invasive measurement. Moreover, investigations of isolated molecular transitions under different conditions provide excellent means to obtain a comprehensive understanding of spectral broadening mechanisms, which is of importance for, for example, environmental sciences and remote sensing applications. In fundamental studies, spectroscopic parameters are often retrieved from fits of a model function of the technique used, which in turn is based upon a suitable lineshape function. In order to obtain parameter values with highest possible accuracy, it is of importance to use the lineshape model that most correctly can predict the measured spectra. Even though the Voigt function is the most commonly used lineshape model when both Doppler and collision broadenings are present, it is not always suitable when spectroscopic parameters are to be assessed with high precision. This thesis represents a thorough investigation of Dicke narrowing and speed-dependent effects, which are phenomena that are not accounted for by the conventional Voigt profile. For the first time, it is demonstrated that both these effects take place not only in absorption but also in the dispersion mode of detection. Their dispersion lineshape functions are first theoretically presumed and explicitly given before they are validated experimentally by the noise-immune cavity-enhanced optical heterodyne molecular spectrometry (NICE-OHMS). By using the models developed, it is also shown that although the two modes of detection, absorption and dispersion, both can provide good quality of fits, they do not always provide identical spectroscopic parameters. A detailed analysis under which conditions they do so, and subsequent recommendations of their use, are presented. It also describes the instrumental implementation of a distributed-feed-back (DFB) laser-based NICE-OHMS instrumentation, which constitutes an important step towards the further development of this technique. Due to the wide tunability of the DFB laser, the setup is capable of extending the working range of NICE-OHMS into the collision broadening region, which, in turn, allows for precise spectroscopic studies. The use of a fiber-coupled DFB laser also provides a compact NICE-OHMS system. The minimum detectable on-resonance absorption was assessed to 2× 10-10 cm-1 for a 70 s integration time.
820303

Diversity Underfoot : Systematics and Biogeography of the Dictyostelid Social Amoebae

Perrigo, Allison L January 2013 (has links)
Dictyostelids (Amoebozoa) are a group of social amoebae consisting of approximately 150 species, which are found in terrestrial habitats worldwide. They are divided into eight major clades based on molecular phylogeny, and within these clades are many species complexes. Some species are seemingly cosmopolitan in distribution, while others are geographically restricted. In this thesis dictyostelids were recovered from high latitude habitats (soils in Sweden and Iceland) as well as from the soles of shoes. Morphological characters and DNA sequence analyses were used to identify isolates that were recovered and delimit new species, as well as to investigate the monophyly of Dictyostelium aureostipes. Nine species were reported from Northern Sweden and four from Iceland. Among the isolates recorded in Sweden were two new species, described as D. barbibulus and Polysphondylium fuscans. P. fuscans was among the four species recovered from footwear, contributing evidence for anthropogenic transport of dictyostelids. Ecological patterns were assessed using linear regression and generalized linear models. The ecological analyses of dictyostelids recovered from Iceland indicate that these organisms are most frequently found in soils of near-neutral pH, but also exhibit a species richness peak in moderately acidic soils. These analyses indicate that in Iceland dictyostelid species richness decreases with altitude, and in the northern hemisphere the species richness increases with decreasing latitude. A three-region analysis of the D. aureostipes species complex indicated that this species is in fact made up of at least five phylogenetically distinct clades, and in light of this the group is in need of taxonomic revision. These results indicate that the dictyostelid species richness is higher than previously known, especially in high-latitude regions, and that even seemingly well-defined species may harbour cryptic diversity. Presently, species ranges may be expanding via anthropogenic dispersal but despite this, the dictyostelids are found to exhibit biogeographic trends well known from macroorganisms, such as a latitudinal gradient of species richness.
820304

Self-help facilitation for people living with disabilities: a tool for empowerment? A qualitative study in the context of rural Zambia

Groth, Sofia, Söderström, Matilda January 2014 (has links)
This report is the result of a field study conducted in the southern part of Zambia, funded by the Swedish International Development Cooperation Agency (SIDA). The aim of this qualitative study was to explore how self-help facilitation provided by the organisation Response Network can contribute to the empowerment of people living with disabilities in the context of rural Zambia. We interviewed four people working for the organisation as well as the principal responsible of youth with disabilities in a rural high school. We also conducted two focus group interviews with two disability support groups in a rural village. The results of this study were analysed using empowerment theory and systems theory. Our findings showed that self-determination, education and participation were contributing to the empowerment of people with disabilities. Level of attitudes, understanding and motivation were shown to be important factors which impact the empowerment of people with disabilities.
820305

United States after the Cold War : And its Foreign Policy of the New World Order

Namaganda, Angela January 2014 (has links)
No description available.
820306

Market Entry Mode Strategies – A study of Bangladesh Mobile Telecommunication Market for Foreign Companies.

Barua, Debashish, Chowdhury, Mahmudur Rahman January 2014 (has links)
Background: Now-a-days, the forces of globalization derive firms to go to international market. When a firm thinks to expand its business outside of the home market, it needs to explore the form of operation through which it will enter into the foreign market. International entry mode research deals with this matter. (Brouthers et.al.2007). Selection of an optimal entry mode strategy is very important because it is very difficult to change or correct and have a long-term impact on the firm’s foreign operation (Pedersen, Petersen, &amp; Benito, 2002). Actually, it is very difficult for a firm to serve in the market on a permanent basis without a well formulated entry strategy. (Pehrsson A. 2008). Market entry mode strategies are influenced by both firm and country level factors and a firm must take into consideration these factors in choosing an appropriate entry mode. Purpose: The basic purpose is to gain a deep knowledge about the critical factors in selecting an optimal international market entry mode strategy to enter into an emerging market. The minor purpose is to justify the suitability of the target market. Methodology: Due to the dependency on subjective interpretation of text or other visual material and small sample was used to investigate the specific phenomena, qualitative method has been practised in this research process. Secondary data has been mainly collected from e-sources, and primary data has been collected through phone interview with the three foreign mobile telecom companies in Bangladesh. Findings: Bangladesh mobile telecommunication market is still attractive for the foreign entrants and the optimal entry mode strategy is joint venture to enter into the moderately attractive industry. Implications: The study has showed that international entry mode strategy is affected by various organizational, economical, Institutional, and sociological factors (categorized as country and firm level factors). This research has also provided relevant information to the potential foreign firms about which country and firm level factors should consider in formulating a well entry mode strategy in perspective of an emerging market.
820307

Cultural entry barriers for SMEs : An exploratory study of cultural entry barriers for foreign SMEs entering Japan

Billore, Gautam, Engkvist Borg, Jakob January 2014 (has links)
Purpose: The purpose of this paper is to study the cultural barriers faced by Small and Medium Enterprises (SMEs) in entering Japanese market and to see how the successful companies have overcome the barriers. Design/methodology/approach: An exploratory case study with qualitative research through semi-structured interviews (telephonic and Skype) with foreign SMEs in Japan. 17 interviews could be conducted in 12 companies out of 76 companies contacted.  Theoretical framework: The theoretical framework encompasses barriers studied by Namiki (1998) for classification of the entry barriers and applied the same on SMEs. The cultural aspect has been deployed in accordance to theory of House et al. (2004), Trompenaars &amp; Hampden-Turner (2012) and on the cultural dimensional framework of Hofstede et al. (2010). It further includes language in intercultural communication and barriers related to it.  Findings: The study identifies that the business culture perceived by foreign SMEs in Japan is almost similar to the national culture identified by Hofstede et al. (2010), but only three out of five cultural dimensions studied and the language have emerged as barriers for the foreign SMEs to do business in Japan. It was also found that to adapt to the Japanese business culture in general, engage in business relationship and to use senior bi-lingual Japanese staff, was keys to success for the foreign SMEs. Managerial implications: It is recommended that managers should study previous literature on cultural barriers as it most likely also applies to SMEs. It is also recommended to use Japanese bi-lingual staff and to establish relationships with Japanese companies as soon as possible. Limitations: The study was conducted with interviews of only twelve SMEs in Japan. The study was confined to qualitative method and a quantitative study with larger number of companies could have fetched more quantifiable results. Originality/value: This paper is one of the first to analyse the cultural barriers exclusively for the foreign SMEs in Japan with interviewing firms doing business in Japan. Keywords: Entry barriers, cultural barriers, SMEs, Japan market. Classification: Exploratory, qualitative study.
820308

Consumers’ Brand Attitudes: : The Effect of Negative Publicity and Companies’ Response Strategies

Högberg Mårder, Josefine, Lindvall, Emelie January 2014 (has links)
Purpose: The purpose of the study was to assess whether the extent to which consumers’ brand attitudes change when the consumers are exposed to negative publicity of the brand, and when exposed to a company’s response to negative publicity, differ depending on the consumers’ degree of brand loyalty and depending on how positive the consumers’ initial brand attitudes are. Design/methodology/approach: The study had a deductive research approach with a single cross-sectional descriptive and exploratory design. Archival analysis was used to collect relevant theories and to conduct the preparatory data collection through data mining, both in which secondary data was gathered. Survey was used when collecting qualitative primary data in the preparatory data collection through focus groups, and when collecting primary data in the main data collection through a questionnaire. The main data was further analyzed through a one-way ANOVA within a non-parametric Levene’s test. Findings: The extent to which consumers’ brand attitudes changed when consumers were exposed to negative publicity of the brand differed depending on if the consumers’ initial brand attitudes were positive or negative. Consumers with negative brand attitudes had a smaller attitude change compared to consumers with positive brand attitudes, opposed to what was assumed in the current study. The extent to which consumers’ brand attitudes changed when consumers were exposed to negative publicity of the brand did not statistically differ depending on the consumers’ degree of brand loyalty. Neither did the extent to which consumers’ brand attitudes changed when the consumers were exposed to a company’s response to negative publicity differ depending on how positive the consumers’ brand attitudes were, nor on the consumers’ degree of loyalty toward the brand. Research limitations/suggestions for future research: The information concerning the negative event and the company’s response strategy was very concentrated in the questionnaire. In real life, consumers would have had different perceptions of both the event and the response since some parts require consumers to actively search for information. Hence, suggestion for future research is to measure the attitude changes where the consumers have gained information in a natural course. Implications: The new perspective brought forth through the study could be useful for brand managers to bear in mind when setting up strategies on how to manage a negative publicity situation such as the Apple/Foxconn case.
820309

Evaluation of logistic regression and random forest classification based on prediction accuracy and metadata analysis

Wålinder, Andreas January 2014 (has links)
Model selection is an important part of classification. In this thesis we study the two classification models logistic regression and random forest. They are compared and evaluated based on prediction accuracy and metadata analysis. The models were trained on 25 diverse datasets. We calculated the prediction accuracy of both models using RapidMiner. We also collected metadata for the datasets concerning number of observations, number of predictor variables and number of classes in the response variable.     There is a correlation between performance of logistic regression and random forest with significant correlation of 0.60 and confidence interval [0.29 0.79]. The models appear to perform similarly across the datasets with performance more influenced by choice of dataset rather than model selection.     Random forest with an average prediction accuracy of 81.66% performed better on these datasets than logistic regression with an average prediction accuracy of 73.07%. The difference is however not statistically significant with a p-value of 0.088 for Student's t-test.     Multiple linear regression analysis reveals none of the analysed metadata have a significant linear relationship with logistic regression performance. The regression of logistic regression performance on metadata has a p-value of 0.66. We get similar results with random forest performance. The regression of random forest performance on metadata has a p-value of 0.89. None of the analysed metadata have a significant linear relationship with random forest performance.     We conclude that the prediction accuracies of logistic regression and random forest are correlated. Random forest performed slightly better on the studied datasets but the difference is not statistically significant. The studied metadata does not appear to have a significant effect on prediction accuracy of either model.
820310

The Effects of Installing Automated Ward Solutions for Medicine - A Case Study at Växjö Central Hospital

Gullander, Hannah, Johansson, Sara January 2014 (has links)
Research Questions: Research Question I: How does the material management process of medicine differ between a ward with, and without, an Automated Ward Solution (AWS)? Research Question II: How do time and costs differ in the material management process of medicine between a ward with, and without, an AWS? Research Question III: How has the instalment of a central storage affected the number of orders placed for wards? Purpose: The purpose is to map and compare the material management process of medicine between a ward with, and without, an AWS. Further the mapped processes will be timed, allocated costs by applying TDABC and then compared. The purpose is as well to describe how the instalment of a central storage has affected the frequency of orders placed for wards. Methodology: This project is a qualitative case study as the authors wished to understand the phenomena of having installed AWSs for medicine in a real context. The primary data was collected through interviews, observations and studying of documents; the secondary data was collected through scientific articles and literatures. The collected data answered the research questions with the help of process mapping and TDABC. Conclusion: In the created process maps it is found that the extensiveness of the different processes when compared are similar for both wards; however the allocated costs calculated through TDABC sometimes differ due to the involvement of the Pharmaceutical Unit as it carries a higher capacity cost per minute. Ward 5 can be assumed to have a higher security and accuracy due to the instalment of an AWS and by having laid more responsibility on the Pharmaceutical Unit. The AWS has however led to a larger waste for Ward 5 as it cannot return regular medicine anymore. This project could not directly connect the instalment of a central storage with reduced order lines; however it can be assumed that it has contributed to the decreased order lines placed.

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