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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.
1

Environmental factors affecting planktonic foraminifera abundance and distribution in the Northeast Gulf of Mexico

Ravula, Sharath Reddy 29 August 2005 (has links)
The shell composition of planktonic foraminifera used in many paleoreconstructions assumes they are accurately representing conditions at the surface/mixed layer. However, planktonic foraminifera are known to inhabit a depth range that extends below the mixed layer. In the present study, foraminifera were collected at discrete depth intervals using a Multiple Opening and Closing Net Environmental Sensing System (MOCNESS) in either cyclonic or anticyclonic eddies that had contrasting environmental conditions. The foraminifera abundances and distributions were compared to the water depth, temperature, density, and chlorophyll profiles. Nine species were found consistently among all the tows and composed at least 96% of the species found, though a shift in the species abundances and depths occurred between eddies. Species occurred where physical factors were compatible with conditions and feeding opportunities they were adapted to. Three species pink and white Globigerinoides ruber and Globigerinoides sacculifer thrived best when a steep density gradient resulted in a shallower mixed-layer that restricted them under more intense light and allowed them to better exploit their algae symbionts. Globigerina bulloides was found outside its sub-polar habitat because the waters of the cyclones were cool enough (less than 26??C) at the same depths that sufficient chlorophyll was available. Two species Orbulina universa, and Globorotalia menardii were consistently absent in the mixed layer, but tracked deeper chlorophyll concentrations. Three other species were found inconsistently among the tows: Hastigerina pelagica, Globigerinella siphonifera, and Globigerinella calida. H. pelagica probably follows chlorophyll concentrations. G. siphonifera, and G. calida have a preference for deeper waters within the photic zone. The drastic doubling to tripling of the foraminifera abundances in cyclones biases downcore reconstructions of sea surface temperature towards cooler conditions. Also, the shift in species composition between the two eddies indicates that in environments where eddies, upwellings, or rings exist may bias the downcore composition of each species towards cooler conditions. G. sacculifer was found to live primarily in the mixed layer and at least 75% of its downcore individuals are expected to represent conditions there. Researchers should consider the described species distributions to better understand the water column conditions they are reconstructing.
2

P450 enzymes in the basal ganglia and their role in Parkinson's disease

Watts, Paul Michael January 2002 (has links)
No description available.
3

The Impacts of Environmental factors on the Population Dynamics of the Formosan landlocked salmon

Lee, Cheng-Chiang 13 June 2007 (has links)
The impacts that environmental factors brought to the population of the Formosan landlocked salmon are discussed in this paper and the evidence results indicate that the air temperature and typhoon have taken negative effect during past 15 years. Under the population simulations, without considering the environmental factors, it is clear that the population growth rate tends towards a steady state in the long run. On the contrary, the population would be in decline or suffer the extermination while we consider those factors.
4

Environmental factors affecting planktonic foraminifera abundance and distribution in the Northeast Gulf of Mexico

Ravula, Sharath Reddy 29 August 2005 (has links)
The shell composition of planktonic foraminifera used in many paleoreconstructions assumes they are accurately representing conditions at the surface/mixed layer. However, planktonic foraminifera are known to inhabit a depth range that extends below the mixed layer. In the present study, foraminifera were collected at discrete depth intervals using a Multiple Opening and Closing Net Environmental Sensing System (MOCNESS) in either cyclonic or anticyclonic eddies that had contrasting environmental conditions. The foraminifera abundances and distributions were compared to the water depth, temperature, density, and chlorophyll profiles. Nine species were found consistently among all the tows and composed at least 96% of the species found, though a shift in the species abundances and depths occurred between eddies. Species occurred where physical factors were compatible with conditions and feeding opportunities they were adapted to. Three species pink and white Globigerinoides ruber and Globigerinoides sacculifer thrived best when a steep density gradient resulted in a shallower mixed-layer that restricted them under more intense light and allowed them to better exploit their algae symbionts. Globigerina bulloides was found outside its sub-polar habitat because the waters of the cyclones were cool enough (less than 26??C) at the same depths that sufficient chlorophyll was available. Two species Orbulina universa, and Globorotalia menardii were consistently absent in the mixed layer, but tracked deeper chlorophyll concentrations. Three other species were found inconsistently among the tows: Hastigerina pelagica, Globigerinella siphonifera, and Globigerinella calida. H. pelagica probably follows chlorophyll concentrations. G. siphonifera, and G. calida have a preference for deeper waters within the photic zone. The drastic doubling to tripling of the foraminifera abundances in cyclones biases downcore reconstructions of sea surface temperature towards cooler conditions. Also, the shift in species composition between the two eddies indicates that in environments where eddies, upwellings, or rings exist may bias the downcore composition of each species towards cooler conditions. G. sacculifer was found to live primarily in the mixed layer and at least 75% of its downcore individuals are expected to represent conditions there. Researchers should consider the described species distributions to better understand the water column conditions they are reconstructing.
5

Sickness presenteeism among nurses

Linnerud, Siv January 2013 (has links)
This thesis is the main product of a Masters degree in Health Science, written by a student at the Department of Social Work and Health Science at Norwegian University of Science and Technology. The thesis discusses sickness presenteeism in general and sickness presenteeism among nurses in particular. Nursing is one of the occupations that are more exposed to sickness presenteeism. Despite this, very little research has yet been done on this correlation – in Norway, almost none. The thesis consists of two articles. The first article presents the concept of sickness presenteeism along with existing theories and research in general and concerning nurses. This is a theoretical article, in which the purpose is to identify why sickness presenteeism is not an ideal situation for nurses and which work-related factors that influence sickness presenteeism among nurses. The research question for this article is “What work-environmental factors have an influence on nurses sickness presenteeisem?” The second article is an empirical article and is done in connection with a survey of nurses’ sickness presenteeism within a Norwegian hospital. The survey examines the connection between sickness presenteeism and the use of substitutes, different working time arrangements and the influence of teamwork. The purpose of this article is to assess how the three work-environmental factors influences nurses’ sickness presenteeism, conducted with the help of three hypotheses. These are: H1: Working-time arrangements have an influence on sickness presenteeism H2: Low extent of using substitutes is related to higher level of sickness presenteeism H3: Good working relationship between co-workers is related to higher level of sickness presenteeism The empirical work for this master’s thesis has been conducted using a quantitative method. This method was chosen based on a desire to investigate the extent, distribution and differences within sickness presenteeism among nurses. A quantitative method gives an opportunity to investigate a larger group of nurses, and obtain results that can also be valid for other nurses. If a qualitative method were to be used, it would not have been possible to collect information from the same number of nurses and the results would most likely not represent nurses in general because of assumed differences between nurses. By using a qualitative method I was also able to compare the results with results from similar studies done in other countries. Still, the quantitative method has little room for a flexible approach to theory, and does not provide information about what might cause the sickness presenteeism. I still found this method to be the most suitable for what I wanted to achieve in this master’s thesis. A survey based on questions used by other researchers with an interest in the same field, was used to collect data. Using questions that others had already used made the results easier to compare, and also acted as some kind of quality control to the questions I first developed. The choices made concerning the survey, items and analysis is further described in chapter 2.0 Method of my empirical article. The strength and limitations of the method is discussed in chapter 4.1 Strengths and limitations of that same article.
6

The Internationalization strategies of Chinese Privately Owned Enterprise : a Case Study on Wonder Auto Technology Inc.

Jiang, Mingming January 2012 (has links)
There is an upsurge of trend in studying the internationalization strategy (IS) of firms from China in international business (IB) research area. However studies which have done on Chinese firms in IB area are mostly focused on large state owned enterprises (SOEs), and there are few studies which have focused on the IS of Chinese privately owned  enterprises  (POEs).  This  study  used  the  framework  of  environment – internationalization  strategy – performance as  the theoretical support,  and  adopted  a case study method on a Chinese POE –Wonder Auto Technology Inc.. By analyzing the firm's ISs, the study results showed that Chinese POEs use export, foreign direct investment  (FDI),  and  strategic  alliance  as  their  ISs,  environmental  factors  from institution,  industry,  and  firm  level  could  influence  a  firm's  choices  of internationalization  strategies,  and  these  strategies  are  positive  related  to  the  firm's performance.
7

産後抑うつ状態に関する心理学的研究の概観

小林, 佐知子, KOBAYASHI, Sachiko 20 April 2006 (has links)
国立情報学研究所で電子化したコンテンツを使用している。
8

Förskolebarn upplevelser av lycka : Kopplat till ICF-CYs klassifikation av barns hälsa

Skyum, Cecilia January 2015 (has links)
Syftet med denna studie var att undersöka hur lycka upplevs av förskolebarn.  Individuella intervjuer gjordes med 26 förskolebarn (73% pojkar) mellan 4 och 5 år, med hjälp av en semistrukturerad intervjuguide. Tidigare forskning har visat på att lycka har många delar så som kärlek, välbefinnande, tillfredställelse, god hälsa och att lycka skulle kunna vara något större så som meningen med livet. Materialet analyserades med stöd av ICF-CY och resultatet visade att barn upplevde lycka när de kände sig delaktiga i ett sammanhang. Omgivningsfaktorer, så som att barnen fick något av materiell karaktär samt familjekontexten har också betydelse om barn känner sig lyckliga. Barn ville känna sig delaktiga, ha en stabil omgivning och kärleksfulla nära relationer. Denna studie bidrar till att belysa barns egen uppfattning av just begreppet lycka samt ger kunskap som bidrar till att kunna upprätthålla barns chans att få känna lycka. Vidare forskning skulle vara att undersöka om olika personlighets typer  har olika uppfattning om lycka.
9

Environmental Factors that Influence Telecommunications Use by Adolescents with Cerebral Palsy

Carpenter, Sonja Maria January 2009 (has links)
Background: Social participation is essential to well-being for adolescents with and without disabilities. Adolescents with a disability, however, often have fewer friendships and experience social isolation compared to their peers without disability. Telecommunications play a vital role in facilitating social participation for adolescents yet those with a disability experience reduced access. Based on the World Health Organisation’s framework of the International Classification of Functioning, Disability and Health (ICF) this study aimed to identify environmental factors (barriers and facilitators) that impact on participation in telecommunication use, as perceived by adolescents with cerebral palsy and their communication partners. Method: A qualitative research design was adopted using observations and in-depth interviews with five dyads of adolescents with cerebral palsy and significant communication partners. Data from interviews was analysed using qualitative content analysis to identify barriers and facilitators. Results and Conclusions: A total of 66 facilitators and 72 barriers to telecommunication use were identified. These were divided into four categories; people-related, equipment-related, support/training-related and ‘other’. A large number of interrelated people and equipment related factors were identified. Participants also identified the need for further training and support. In order to improve social participation for adolescents with disabilities, future research must investigate the development of assessment tools that accurately identify environmental barriers to telecommunication use and contribute to the development of strategies to over come these barriers.
10

Stakeholders, corporate policy and the environment : - a sustainable threesome?

Hyleen, Mikael, Ågren, Johannes January 2008 (has links)
The aim of this study is to research environmental factors and their impact among manufacturing companies in Umeå. In order to capture the essence of environmental impacts , two research questions were asked; which environmental factors are considered, and in what context are they evaluated among manufacturing companies in Umeå, and how are stakeholders an implication on corporate environmental efforts for manufacturing companies in Umeå? First and foremost relevant theories were discovered, using several databases. Second, they were incorporated into a conceptual framework, where their relationship and characteristics were displayed. The theories were then transformed into themes, which became the foundation of the interview guide. The study was conducted by interviewing six manufacturing companies with more than 10 employees in Umeå. The interviews were semi-structured, and a mixture of telephone interviews and in-person interviews. An analysis of the empirical material was undertaken, by analyzing the data using the theories found during the information search. Almost all participating companies consider environmental factors in one way or another, according to the findings of this study. Further, the customers were concluded to be the most important stakeholder in leading to environmental reform among the companies. However, other stakeholders were also recognized by the respondents, and had an impact in for the stakeholders’ specific circumstances.

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