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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.
551

Mating behaviour, epibiotic growth, and the effect of salinity on grooming activity in the hermaphroditic shrimp Lysmata wurdemanni

Giri, Tuhin 30 September 2004 (has links)
Many species of caridean shrimp are protandrous hermaphrodites, maturing initially as males but developing into females as they age and grow. A unique sexual system was recently discovered in the peppermint shrimp, Lysmata wurdemanni. In this species, individuals are initially male, but become simultaneous functional hermaphrodites over time. As in most caridean shrimp, L. wurdemanni can mate as a male during the intermoult period, but can reproduce through female function for only a short period after moulting. Ecdysis does not occur en masse in this species, and thus the operational sex ratio found in populations of L. wurdemanni is extremely male-biased. Sexual selection theory suggests that these conditions will result in increased competition for access to mates. Evolutionary pressures should therefore have selected for mechanisms that permit individuals to quickly identify and locate potential mating partners. L. wurdemanni were exposed to chemical stimuli collected from recently moulted conspecifics of varying reproductive condition. Test animals were able to distinguish among the different conditions, and physically manipulated only the plastic nozzle used to pump solutions collected from shrimp with ovaries filled with vitellogenic oocytes. It was subsequently hypothesized that methyl farnesoate, a hormone associated with ovarian maturation in crustaceans, might be a key component of sex pheromones used by L. wurdemanni. However, a series of methyl farnesoate concentrations did not elicit responses, indicating this species does not use this hormone alone when determining reproductive condition. Reproductive behaviour in L. wurdemanni was observed to differ both before and after copulation, as well as with increasing population density. Intermoult individuals were more likely to approach, follow and remain in the vicinity of a near-moult shrimp before mating could occur, and under high density conditions. The near-moult shrimp approached conspecifics only under low density conditions, and performed rapid escape behaviours only after copulation had occurred. The unusual occurrence of epibiota upon L. wurdemanni was described, and the location, size and age of barnacles quantified. The effect of salinity upon grooming activities was tested. Results indicated that carapace grooming was depressed at low salinities, and could account for the considerable epibiota found in this region.
552

The Relationship between Dominance and Vocal Communication in the Male Ring-tailed Lemur (Lemur catta)

Bolt, Laura McLachlan 07 January 2014 (has links)
Sex-specific calls are used in male-male agonistic encounters and male-female courtship in many animal species. The ring-tailed lemur (Lemur catta) is a gregarious Malagasy strepsirhine with twenty-two distinct vocalizations for adults, including two male-specific vocalizations and an additional vocalization with male-specific functions: the howl, the squeal, and the purr. Proposed intra-sexual agonistic functions for these three vocalizations have never been empirically tested. This study’s purpose was to investigate the functions of howling, squealing, and purring in the ring-tailed lemur, and to assess the relationships between the rates of these vocalizations and male dominance. From March to July 2010, I collected 600 hours of total data and 480 hours of focal data on male ring-tailed lemurs aged three and older at Beza Mahafaly Special Reserve, Madagascar. I observed each male continuously for 30 minutes at a time and noted behaviours including all vocalizations and all agonism using one–zero sampling at 2.5-min intervals. I calculated male dominance rank and vocalization rates from these data. My results indicated that male dominance rank is correlated with male purring rate and with squealing rate, but not with howling rate. Male purring rate increased during intra-sexual agonism and was associated with aggression in agonistic encounters. Squealing rate increased during male-male agonism and indicated both aggression and submission in male-male encounters. Howling rate increased during inter-group encounters and a greater number of males participated in multi-male howling choruses when non-group members were present. Purring and squealing are agonistic vocalizations and used in male-male agonism in the ring-tailed lemur, while howling is used in inter-group encounters.
553

Determinants of Swedish Bank Selection Choices by International students

Wei, Sijia, Lu, Jingxian January 2013 (has links)
Aim: This study aims to explore bank selection criteria employed by international students in Gavle, Sweden. Methodology: Data was collected through semi-open structure questionnaire. The researchers do sampling a total of 101 students in the University of Gavle. After data collection through questionnaire, data was analyzed through SPSS19 software. A non-probabilistic convenience sampling was employed and data was analyzed to be refined and reduced in a manageable way. Conclusion: There are four factors which are the main reasons in influencing international students choosing banks in Sweden. This study reveals that “Good service provision”, “assurance”, “value added service”, “convenience and security” have significant influence on the bank selection decision of international students. There is no difference between ethnicity in influencing factors. Besides, different genders have same influencing factors as the four factors in this research.   Implications and value of this research: This research steps further in the investigation about customer bank selection behavior. It is the research that focuses on individual customers of banks especially in Sweden. Furthermore, the results of this research can be beneficial for banks to identify appropriate strategies to attract and retain international students. Suggestion for future studies: The international students are banks’ potential customers in the long run. Because the results of this study are only based on customer’s perceptions, it could be an interesting research area for future researchers to investigate the correspondence between and service providers’ and consumers’ perceptions. In addition, because one of our study limitations was that the research only conducted in one city: Gavle, it would be interesting to investigate other Swedish universities international students for the same topic.
554

The Relationship between Dominance and Vocal Communication in the Male Ring-tailed Lemur (Lemur catta)

Bolt, Laura McLachlan 07 January 2014 (has links)
Sex-specific calls are used in male-male agonistic encounters and male-female courtship in many animal species. The ring-tailed lemur (Lemur catta) is a gregarious Malagasy strepsirhine with twenty-two distinct vocalizations for adults, including two male-specific vocalizations and an additional vocalization with male-specific functions: the howl, the squeal, and the purr. Proposed intra-sexual agonistic functions for these three vocalizations have never been empirically tested. This study’s purpose was to investigate the functions of howling, squealing, and purring in the ring-tailed lemur, and to assess the relationships between the rates of these vocalizations and male dominance. From March to July 2010, I collected 600 hours of total data and 480 hours of focal data on male ring-tailed lemurs aged three and older at Beza Mahafaly Special Reserve, Madagascar. I observed each male continuously for 30 minutes at a time and noted behaviours including all vocalizations and all agonism using one–zero sampling at 2.5-min intervals. I calculated male dominance rank and vocalization rates from these data. My results indicated that male dominance rank is correlated with male purring rate and with squealing rate, but not with howling rate. Male purring rate increased during intra-sexual agonism and was associated with aggression in agonistic encounters. Squealing rate increased during male-male agonism and indicated both aggression and submission in male-male encounters. Howling rate increased during inter-group encounters and a greater number of males participated in multi-male howling choruses when non-group members were present. Purring and squealing are agonistic vocalizations and used in male-male agonism in the ring-tailed lemur, while howling is used in inter-group encounters.
555

Supreme Court appointments in the charter era: the current debate and its implications for reform

Hanson, Lawrence J 11 1900 (has links)
The presence of the Charter of Rights and Freedoms in the Constitution of Canada has transformed the historic discourse about what types of people should be appointed to the Supreme Court and the manner in which they should be selected. During the period between 1949, when the Supreme Court replaced the Judicial Committee of the Privy Council in Britain as Canada's highest appellate body, and the Charter's entrenchment in 1982, the debate centered almost exclusively on questions of federalism. Specifically, the provinces argued that in a federal country, it is inappropriate that the status and composition of the court of last resort be left to the sole discretion of the central government. The Charter, with its enumeration of a variety of social categories, has produced new demands that the Court be more socially representative. Feminist legal scholars and women’s advocacy groups claim that a more representative judiciary in general and Supreme Court in particular would perform both symbolic and instrumental functions, while ethno cultural organizations have to date concentrated almost solely upon the symbolic dimension. By contrast, claims for self-government and separate justice systems illustrate that many aboriginal leaders believe their peoples’ grievances can best be met through disengagement from, rather than further integration into, Canadian political and legal processes. The Charter's presence also has conditioned demands for are formed appointment process. Now that the Court is to serve as the arbiter of citizen-state relations, many suggest, it is improper for the state to have sole control over who is appointed to that body, and therefore a more participatory and pluralistic appointment process is advocated. Clearly, these two broadly-defined reform agendas can conflict with one another. While the provinces demand more diffuse government involvement in the appointment of judges, those concentrating on the Court's Charter responsibilities believe that the state already unduly dominates the process. However, the current debate has further, largely unexplored consequences for potential reform. The failure of most participants in the debate, be they governments, scholars or advocacy groups, to articulate coherent approaches to questions of jurisprudential theory, combined with the difficulties inherent in applying the concept of representation to a judicial body, renders their critiques less valuable as guides to reform. Worse, their inadequate treatment of these issues often results in such critics undermining the legitimacy of the institution whose reform they seek.
556

Multi-view hockey tracking with trajectory smoothing and camera selection

Wu, Lan 11 1900 (has links)
We address the problem of multi-view multi-target tracking using multiple stationary cameras in the application of hockey tracking and test the approach with data from two cameras. The system is based on the previous work by Okuma et al. [50]. We replace AdaBoost detection with blob detection in both image coordinate systems after background subtraction. The sets of blob-detection results are then mapped to the rink coordinate system using a homography transformation. These observations are further merged into the final detection result which will be incorporated into the particle filter. In addition, we extend the particle filter to use multiple observation models, each corresponding to a view. An observation likelihood and a reference color model are also maintained for each player in each view and are updated only when the player is not occluded in that view. As a result of the expanded coverage range and multiple perspectives in the multi-view tracking, even when the target is occluded in one view, it still can be tracked as long as it is visible from another view. The multi-view tracking data are further processed by trajectory smoothing using the Maximum a posteriori smoother. Finally, automatic camera selection is performed using the Hidden Markov Model to create personalized video programs.
557

Factors that Influence Accountants’ Selection of Delivery Modalities for Professional Development

Ross, Kathleen 01 May 2012 (has links)
The obligation to maintain and develop professional competence throughout an individual’s career is a fundamental requirement of a maintaining a professional accounting designation. Accountants can select their continuing professional development (CPD) from a number of modalities. The study was a cross sectional sample created by self selection from a researchers' email invitation to accountants in Canada to determine which modalities accountants preferred, and the selection factors they used in making those selections. A total of 428 accountants from across Canada completed the online survey. The results found that the accountants had taken courses in all modalities presented with live seminar and live webinar being the most popular modalities. Accountants preferred synchronous over asynchronous courses. The factors most important to accountants are content, cost and CPD hour requirements. Generally, the differences found in selection factors for distance versus face-to-face modalities related to the flexibility of the distance course to reduce time away from work. The ranking of selection factors for synchronous courses in general did not differ from those for asynchronous courses with the exception of self-paced courses where the pace and time away from work were ranked higher than for other courses. Further research is suggested to determine the value of both live and recorded seminars and webinars, as well as potential opportunities for mobile modality use for CPD courses. Additional research should be conducted to determine why differences were found in ranking in demographics in order to ensure that future CPD courses are offered in modalities that provide benefits for all respondents. / 2012-06
558

The Faking Dilemma: Examining Competing Motivations in the Decision to Fake Personality Tests for Personnel Selection

Komar, Jennifer Anne January 2013 (has links)
More than 80 years ago, researchers and practitioners first recognized that applicants may be motivated to fake their responses to pre-employment personality tests to improve their chances of securing employment (Zickar & Gibby, 2006). Although we have learned much about faking over the ensuing decades, we still know very little about the situational or individual factors that influence applicants’ motivation to fake. In this dissertation, I evaluated several situational and individual variables to determine the degree to which they work independently and jointly to influence responses to a personality test. Study 1 examined the impact of 12 situational variables on faking intentions. The desirability of the job, warning applicants that their responses would be verified, warning applicants that faking will result in their removal from the applicant pool, and the number of other available job opportunities were found to have strong effects on faking intentions. In Studies 2 and 3, these variables were examined in experiments with a sample of undergraduate students and a sample of job seekers to determine if, and how, these variables interact to influence faking. In both studies, significant higher-order interactions were found among the variables in predicting intentions to fake. It appeared that test takers did take into account the desirability of the job, warnings against faking and the number of other job opportunities in deciding whether faking would be a prudent test-taking strategy, although the results were not entirely consistent across the two studies. Study 3 also utilized expectancy theory to attempt to explain the effects of the situational and individual difference variables on intentions to fake. Expectancy, instrumentality and valence perceptions were significant predictors of intentions to fake, however, job desirability, the perception of negative consequences for faking and the number of job opportunities were not strongly related to expectancy, instrumentality and valence. Studies 2 and 3 also demonstrated that the trait of honesty-humility was negatively related to test takers’ intentions to fake. These three studies provide some empirical support for existing models of faking and enhance the understanding of the antecedents of the motivation to fake on pre-employment personality assessments.
559

Tree species selection for the Halifax urban forest under a changing climate

Rostami, Maliheh 17 August 2011 (has links)
Tree selection is critical to ensuring that urban forests are diverse, healthy, and adapted to the urban environment. Climate is one of the main controllers of plant distribution around the world, so tree species are expected to redistribute as a result of climate change. This research aimed to identify which eastern North American tree species should be most suited for planting in urban areas in Halifax given impending climate change. A database was developed for 57 tree species and 95 tree characteristics to enable analysis of tree species native to eastern North America. The results of previous climate envelope research and the database were used to identify the tree species most suitable for planting in Halifax. Of the 57 tree species examined, 16 were identified as most suited for the Halifax urban forest of the 21st century.
560

The Growth Potential of the 'Next-11': The Importance of Emerging Markets for Canadian Agrifood Trade

Cairns, Alexander Philip 16 September 2011 (has links)
The capacity of Canada’s export-oriented agrifood sectors to cope with contemporary challenges may hinge on their ability to identify new export markets. This thesis uses an import demand model, developed by Hallak (2006), to assess how per capita expenditure on Canadian agrifood exports is influenced by income growth and the presence of a preferential trade agreement for a group of emerging economies, known as ‘the Next-11.’ Results reveal that while as a group the Next-11 does not appear to be distinct from other income groups or the BRICs in terms of their expenditures on agrifood imports, Vietnam and South Korea demonstrate expenditure elasticities notably higher then other Next-11 and BRIC members. Finally, the findings cast doubt on the capacity of PTAs to enhance Canadian agrifood trade. However, this result may be indicative of Canada’s longstanding commitment to multilateral trade liberalization and the corresponding delay in the adoption of PTAs.

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