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University of Illinois – Urbana-Champaign
1.
Wu, Di.
Cross-regional word duration patterns in Mandarin.
Degree: PhD, Linguistics, 2017, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/97356 
► Duration contrasts can convey many types of information, including language background, word structure, word frequency, speech genre, intention, and emotions. An understanding of duration lays…
(more)
▼ Duration contrasts can convey many types of information, including language background, word structure, word frequency, speech genre, intention, and emotions. An understanding of
duration lays the foundation for many aspects of speech technology since
duration plays a major role in speech production and perception. This dissertation explores the
duration patterns of Mandarin words among three Mandarin dialectal regions – Beijing, Taiwan, and Malaysia.
This dissertation brings diverse methodologies on speech data collection, annotation, and corpus construction to investigate linguistic pattern. Three speech production studies are conducted to explore the
duration patterns of words with different length and internal structures.
These studies reveal the general
duration patterns of Mandarin Words. First of all, all the multi-syllabic words demonstrate the disyllabic long-short metrical form. Second, linguistic factors – syllable structure, positions (syllable position, word position, and sentence position), word frequency, word category, word internal structure, particle attachment, speech rate of sentence have significant effects on syllable
duration. Thirdly, social factor – region interacts with multiple linguistic factors (word structure, syllable position, and particle attachment) and plays an important role in
duration prediction.
Quantitative data from these studies reveal that there are regional differences in rhythmic contrast among different Mandarin speaking regions. Beijing Mandarin speakers are more sensitive to the length change of linguistic unit and show stronger rhythmic contrast than speakers from Taiwan and Malaysia Mandarins. The results also display that Malaysia Mandarin speakers show the similar rhythmic pattern as Beijing Mandarin speakers.
The investigation of
duration patterns in this dissertation provides a detailed description of word
duration in Mandarin. This dissertation also provides the foundation for further research on
duration pattern related super-segmental feature. A comprehensive understanding of
duration pattern with linguistic and social factors is helpful to improve the quality of durational models used in speech technology.
Advisors/Committee Members: Shih, Chilin (advisor), Shih, Chilin (Committee Chair), Shosted, Ryan (committee member), Packard, Jerome (committee member), Loucks, Torrey (committee member), Yan, Xun (committee member).
Subjects/Keywords: Duration pattern
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APA (6th Edition):
Wu, D. (2017). Cross-regional word duration patterns in Mandarin. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/97356
Chicago Manual of Style (16th Edition):
Wu, Di. “Cross-regional word duration patterns in Mandarin.” 2017. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed December 13, 2019.
http://hdl.handle.net/2142/97356.
MLA Handbook (7th Edition):
Wu, Di. “Cross-regional word duration patterns in Mandarin.” 2017. Web. 13 Dec 2019.
Vancouver:
Wu D. Cross-regional word duration patterns in Mandarin. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2017. [cited 2019 Dec 13].
Available from: http://hdl.handle.net/2142/97356.
Council of Science Editors:
Wu D. Cross-regional word duration patterns in Mandarin. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2017. Available from: http://hdl.handle.net/2142/97356
Leiden University
2.
Koers, Judith Berber.
Relatie slaapduur en executief functioneren gemodereerd door temperament bij 9 t/m 11 jarigen?.
Degree: 2013, Leiden University
URL: http://hdl.handle.net/1887/21465
► Children differ in their school performances, which are influenced by their executive functions (EF). The cause of these differences can probably be explained by individual…
(more)
▼ Children differ in their school performances, which are influenced by their executive functions (EF). The cause of these differences can probably be explained by individual differences in sleep
duration and temperament. The moderating effect of temperament on the association between sleep
duration and EF and mutual relations have been studied. The sample consisted of 499 ‘normal’ children (228 boys, 271 girls) between 9 to 12 years (M = 10.5; SD = 0.85). Sleep
duration is measured by a sleep log, temperament factors Extraversion, Negative Affectivity and Effortful Control by the EATQ-R. EF is divided in working memory (Visual digit span task) and inhibition (PVT Go/No-Go). ANCOVA has showed only an association between shorter sleep
duration and less working memory for introvert children and the other way around (F(2, 410) = 5.15, p = .006), but not for neutral extraverted children or high extraverted children. Also other temperament factors did not show moderation effects. Furthermore, shorter sleep was significantly related with less inhibition (r = .12), but with better working memory (r = -.52). Extraverted children differ from introverted children on working memory (F(2, 433) = 3.24, p = .040) and little Effortful Control differs from the average level of Effortful Control (F(2, 436) = 3.55, p = .030). There were no other significant results in this study. This study has shown that school performances are not only influenced by cognitive capacities, but also by sleep and child’s temperament traits.
Advisors/Committee Members: Vermeulen, M.C.M (advisor).
Subjects/Keywords: Executive functions; Sleep duration; Temperament
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APA (6th Edition):
Koers, J. B. (2013). Relatie slaapduur en executief functioneren gemodereerd door temperament bij 9 t/m 11 jarigen?. (Masters Thesis). Leiden University. Retrieved from http://hdl.handle.net/1887/21465
Chicago Manual of Style (16th Edition):
Koers, Judith Berber. “Relatie slaapduur en executief functioneren gemodereerd door temperament bij 9 t/m 11 jarigen?.” 2013. Masters Thesis, Leiden University. Accessed December 13, 2019.
http://hdl.handle.net/1887/21465.
MLA Handbook (7th Edition):
Koers, Judith Berber. “Relatie slaapduur en executief functioneren gemodereerd door temperament bij 9 t/m 11 jarigen?.” 2013. Web. 13 Dec 2019.
Vancouver:
Koers JB. Relatie slaapduur en executief functioneren gemodereerd door temperament bij 9 t/m 11 jarigen?. [Internet] [Masters thesis]. Leiden University; 2013. [cited 2019 Dec 13].
Available from: http://hdl.handle.net/1887/21465.
Council of Science Editors:
Koers JB. Relatie slaapduur en executief functioneren gemodereerd door temperament bij 9 t/m 11 jarigen?. [Masters Thesis]. Leiden University; 2013. Available from: http://hdl.handle.net/1887/21465
Leiden University
3.
Verbraak, Nicole.
Doornroosje werd geprikkeld. De rol van slaapduur als mediator in de relatie tussen chronotype en inhibitie bij kinderen van 9 t/m 11 jaar.
Degree: 2013, Leiden University
URL: http://hdl.handle.net/1887/21466
► Sleep duration and chronotype are known to have an influence on inhibitory control in adolescents. To date, there are no studies that have looked into…
(more)
▼ Sleep
duration and chronotype are known to have an influence on inhibitory control in adolescents. To date, there are no studies that have looked into this relationship in in school age children . The question in this research is, is the relationship between chronotype and inhibition mediated by sleep
duration in children between the age of 9 and 11 years old? The sample included 594 children between 9 and 11 years old (M=10.48, SD=.82). There were 227 boys and 263 girls (from 104 children gender was unknown). Three instruments have been used; the first instrument was the Children's ChronoType Questionnaire (CCTQ). This questionnaire measures whether the child would a morning type or an evening type. The second instrument was a sleep diary. This sleep diary measures different elements of sleep, for this study the average sleep
duration was used. The last instrument that was used, was the inhibition Psychomotor Vigilance Task GoNogo (PVT GoNogo). This instrument measures inhibition with the percentage of correct Nogo's. In this study, chronotype did not serve as a significant predictor for inhibition. In addition, chronotype did not serve as a significant predictor for sleep
duration. However, sleep
duration did serve as a significant predictor for inhibition (β =.12, t(459) = 2.48, p =.014). Longer
duration of sleep was correlated to better inhibition. There was no evidence for sleep
duration as a mediator between chronotype and inhibition in children between the age of 9 and 11 years old. Information on the influence of sleep on inhibition problems can be valuable to both professionals and parents. Sleeping problems should also be considered, when there are inhibition problems.
Advisors/Committee Members: Ketelaars, Dr. M.P (advisor).
Subjects/Keywords: inhibition; sleep duration; chronotype; cognition
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APA (6th Edition):
Verbraak, N. (2013). Doornroosje werd geprikkeld. De rol van slaapduur als mediator in de relatie tussen chronotype en inhibitie bij kinderen van 9 t/m 11 jaar. (Masters Thesis). Leiden University. Retrieved from http://hdl.handle.net/1887/21466
Chicago Manual of Style (16th Edition):
Verbraak, Nicole. “Doornroosje werd geprikkeld. De rol van slaapduur als mediator in de relatie tussen chronotype en inhibitie bij kinderen van 9 t/m 11 jaar.” 2013. Masters Thesis, Leiden University. Accessed December 13, 2019.
http://hdl.handle.net/1887/21466.
MLA Handbook (7th Edition):
Verbraak, Nicole. “Doornroosje werd geprikkeld. De rol van slaapduur als mediator in de relatie tussen chronotype en inhibitie bij kinderen van 9 t/m 11 jaar.” 2013. Web. 13 Dec 2019.
Vancouver:
Verbraak N. Doornroosje werd geprikkeld. De rol van slaapduur als mediator in de relatie tussen chronotype en inhibitie bij kinderen van 9 t/m 11 jaar. [Internet] [Masters thesis]. Leiden University; 2013. [cited 2019 Dec 13].
Available from: http://hdl.handle.net/1887/21466.
Council of Science Editors:
Verbraak N. Doornroosje werd geprikkeld. De rol van slaapduur als mediator in de relatie tussen chronotype en inhibitie bij kinderen van 9 t/m 11 jaar. [Masters Thesis]. Leiden University; 2013. Available from: http://hdl.handle.net/1887/21466
University of Edinburgh
4.
Sawyer, Alexia.
Shape and location effects on filled- and empty-intervals as indicators of an independent temporal code in working memory.
Degree: 2011, University of Edinburgh
URL: http://hdl.handle.net/1842/6149
► Objectives Using the filled-duration illusion, this study investigated the existence of an independent temporal code operating in working memory. Extending research suggesting the principle distinction…
(more)
▼ Objectives
Using the filled-
duration illusion, this study investigated the existence of an independent temporal code operating in working memory. Extending research suggesting the principle distinction between filled- and empty-temporal-intervals is additional non-temporal information in filled-intervals, we explored whether the working memory mechanism of binding operates between temporal and non-temporal information in filled-interval memory representations. Such a finding would evidence a temporal code independent of non-temporal codes in empty-intervals. Previously no study has applied this aspect of the working memory framework to cognitive levels of time perception.
Methods
Thirty-two participants completed psychophysical tasks adopting the
duration discrimination reminder task procedure in two experiments. One experiment looked at visual, shape information, the other looked at spatial, location information Reference intervals lasted 300msec and test intervals ranged from 200msec – 400msec. Intervals were either filled or empty. In half of the trails test-intervals were marked by non-temporal stimuli not matching those presenting reference-intervals (changing in shape or location). We predicted an effect of unmatched non-temporal information only on filled-intervals.
Results
Analyses investigated three dependent variables: accuracy, proportion of ‘longer’ responses and bisection point. In the location experiment, a significant effect of unmatched non-temporal stimuli was found only in filled-interval trials, in ‘longer’ analyses. Similar results were reported in the shape experiment, finding an additional effect of interval-type (filled versus empty). Analysis of means showed that unmatched non-temporal information effected filled-intervals in location and shape experiments differently.
Conclusion
An effect of changes in non-temporal information on only filled-interval trials indicates the existence of an independent temporal code, operating in working memory, with a capability to bind with non-temporal information. We suggest that differences in filled-intervals in the location and shape experiments reflect different binding processes operating between temporal information and these two types of non-temporal information.
Advisors/Committee Members: Bak, Thomas, Retsa, Chryssoula.
Subjects/Keywords: Time Perception; Filled-interval duration
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APA (6th Edition):
Sawyer, A. (2011). Shape and location effects on filled- and empty-intervals as indicators of an independent temporal code in working memory. (Thesis). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/6149
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sawyer, Alexia. “Shape and location effects on filled- and empty-intervals as indicators of an independent temporal code in working memory.” 2011. Thesis, University of Edinburgh. Accessed December 13, 2019.
http://hdl.handle.net/1842/6149.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sawyer, Alexia. “Shape and location effects on filled- and empty-intervals as indicators of an independent temporal code in working memory.” 2011. Web. 13 Dec 2019.
Vancouver:
Sawyer A. Shape and location effects on filled- and empty-intervals as indicators of an independent temporal code in working memory. [Internet] [Thesis]. University of Edinburgh; 2011. [cited 2019 Dec 13].
Available from: http://hdl.handle.net/1842/6149.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sawyer A. Shape and location effects on filled- and empty-intervals as indicators of an independent temporal code in working memory. [Thesis]. University of Edinburgh; 2011. Available from: http://hdl.handle.net/1842/6149
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Addis Ababa University
5.
Hassen, Kebede.
Assessment of trypanocidal Drug Resistant Trypanosoma congolense Isolates and Survey on Trypanocidal Drug Management Practices in Western Amhara Regional State, Ethiopia
.
Degree: 2008, Addis Ababa University
URL: http://etd.aau.edu.et/dspace/handle/123456789/5686
► A study was conducted from December 2006 to July 2007 in trypanosomosis endemic areas of western Amhara with the objective of assessing trypanocidal drug resistant…
(more)
▼ A study was conducted from December 2006 to July 2007 in trypanosomosis endemic areas of western Amhara with the objective of assessing trypanocidal drug resistant Trypanosoma congolense isolates and current status of trypanocidal drug management practices.Experimental trypanocidal drug sensitivity test was performed in experimentally infected mice using combined and separately pooled trypanosomal isolates obtained from different districts. This was complimented by a survey that targeted farmers and health professionals involved in veterinary service aiming at current status of trypanocidal drugs. Questionniary survey on farmers revealed that 71.7 % of the respondents had the experience of using trypanocidal drugs by themselves and at least 54 % of them practiced underdosing with any of the three trypanocidal drugs (diminazene aceturate, isometamidium chloride and homidium bromide). Furthermore, from questionnaire survey on professionals, 55.1% of the respondents in veterinary service (MoARD) indicated the use of increased dosages as a measure to avert treatement failures. Point prevalence of trypanosomosis obtained from cattle screened for isolation was found to be 12.4% in Debreelias, 20% in Dembecha and 27.2% for Jabitahnan. T. congolense accounted for 72.9% the overall trypanosomosis cases. The drugs tested failed to permanently clear the parasite, being relapsing at 5.8±0.96 days with 70 mg/kg diminazine aceturate; 14.2±1.99 days with 10 mg/kg isometamidium chloride and 4.6±3.75 days with 10 mg/kg homidium bromide. The difference in the relapse
duration was found to be statistically significant among drugs, being longer with isometamidium (p<0.001) than others. The drugs were also unable to permanently clear trypanosomes from the combined pool when given in combination at intervals, as there was a 40 % relapse with 70 mg/kg diminazene aceturate initial treatement followed by isometamidium 5 mg/kg at 17±3.92days. However sanative pairs appeared to be relatively effective than single drug alone, as relapse
duration was significantly longer (P<0.001) in the former than the latter. Separate pools from each district was also used to compare the relative contribution of drug resistance phenotype in combined pool and similar results were observed (relapses at 7.8±1.57 days; 7.0±1.24 days and 5.8±0.96 days with 70 mg/kg diminazene aceturate; 17.50±1.88 days; 18.20±2.66 days and 11.00±2.15 days with 10 mg/kg isometamidium chloride in pools from Debreelias, Dembecha and Jabitahnan, respectively). The present study revelaed the presence of multidrug resistance that could most probably be attributed to the drug-use practices excercised
the livestock production system. Wise use of currently available trypanocidals in conjunction with other alternative control strategies should be adopted as timely solution for the current problem of trypanosomosis in the region.
Advisors/Committee Members: Ephrem Engidawork (PhD) (advisor).
Subjects/Keywords: Bovine; Relapse Duration; Trypanosoma congolense
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Manager
APA (6th Edition):
Hassen, K. (2008). Assessment of trypanocidal Drug Resistant Trypanosoma congolense Isolates and Survey on Trypanocidal Drug Management Practices in Western Amhara Regional State, Ethiopia
. (Thesis). Addis Ababa University. Retrieved from http://etd.aau.edu.et/dspace/handle/123456789/5686
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hassen, Kebede. “Assessment of trypanocidal Drug Resistant Trypanosoma congolense Isolates and Survey on Trypanocidal Drug Management Practices in Western Amhara Regional State, Ethiopia
.” 2008. Thesis, Addis Ababa University. Accessed December 13, 2019.
http://etd.aau.edu.et/dspace/handle/123456789/5686.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hassen, Kebede. “Assessment of trypanocidal Drug Resistant Trypanosoma congolense Isolates and Survey on Trypanocidal Drug Management Practices in Western Amhara Regional State, Ethiopia
.” 2008. Web. 13 Dec 2019.
Vancouver:
Hassen K. Assessment of trypanocidal Drug Resistant Trypanosoma congolense Isolates and Survey on Trypanocidal Drug Management Practices in Western Amhara Regional State, Ethiopia
. [Internet] [Thesis]. Addis Ababa University; 2008. [cited 2019 Dec 13].
Available from: http://etd.aau.edu.et/dspace/handle/123456789/5686.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hassen K. Assessment of trypanocidal Drug Resistant Trypanosoma congolense Isolates and Survey on Trypanocidal Drug Management Practices in Western Amhara Regional State, Ethiopia
. [Thesis]. Addis Ababa University; 2008. Available from: http://etd.aau.edu.et/dspace/handle/123456789/5686
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
California State University – Sacramento
6.
Anderson, Clayton Otis.
The burdens of job history: occupational tenure, race and unemployment duration.
Degree: MA, Economics, 2011, California State University – Sacramento
URL: http://hdl.handle.net/10211.9/867
► There is a persistent gap in the durations of unemployment between races in the U.S. labor market. This paper examines one possible explanation for that…
(more)
▼ There is a persistent gap in the durations of unemployment between races in the U.S. labor market. This paper examines one possible explanation for that gap, differences in job history and human capital acquired on the job. Specific human capital can lead to a mismatch between offers and expectations that can lead to a longer unemployment spell. It is found that the number of jobs reduces the length of unemployment, while the length of the most recent tenure at an occupation is found to increase it. However, neither of these factors explain much of the differences in unemployment durations between race and ethnic groups.
Advisors/Committee Members: Howell, Jessica.
Subjects/Keywords: Unemployment duration; Race; Occupation
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APA (6th Edition):
Anderson, C. O. (2011). The burdens of job history: occupational tenure, race and unemployment duration. (Masters Thesis). California State University – Sacramento. Retrieved from http://hdl.handle.net/10211.9/867
Chicago Manual of Style (16th Edition):
Anderson, Clayton Otis. “The burdens of job history: occupational tenure, race and unemployment duration.” 2011. Masters Thesis, California State University – Sacramento. Accessed December 13, 2019.
http://hdl.handle.net/10211.9/867.
MLA Handbook (7th Edition):
Anderson, Clayton Otis. “The burdens of job history: occupational tenure, race and unemployment duration.” 2011. Web. 13 Dec 2019.
Vancouver:
Anderson CO. The burdens of job history: occupational tenure, race and unemployment duration. [Internet] [Masters thesis]. California State University – Sacramento; 2011. [cited 2019 Dec 13].
Available from: http://hdl.handle.net/10211.9/867.
Council of Science Editors:
Anderson CO. The burdens of job history: occupational tenure, race and unemployment duration. [Masters Thesis]. California State University – Sacramento; 2011. Available from: http://hdl.handle.net/10211.9/867
University of Zambia
7.
Banda, Kamuna,Ackim.
Impact of rainfall variability and agricultural factors on maize yeild in Lusaka Province, 1976 to 2002
.
Degree: 2011, University of Zambia
URL: http://hdl.handle.net/123456789/645
► There are many non climatic factors influencing the agricultural potential of an area, but of the climatic factors, the most important are the distribution in…
(more)
▼ There are many non climatic factors influencing the agricultural potential of an area, but of the climatic factors, the most important are the distribution in time and the amount of rainfall. The purpose of this study is to probe rainfall variability based on the persistence model which follows a theoretical distribution, and the theory of runs which requires that time series of rainfall data be considered as a success or failure about a selected truncation level. The overall objective of the study was to investigate the rainfall patterns, the agricultural factors, some drought run parameters and the frequency of their occurrence during the period 1976-2002 in relation to maize yields. The methodology included the use of probability sampling techniques, time series analysis, magnitude frequency analysis and the principal axis factor analysis in which 15 variables were correlated yielding six factors which were then orthogonally rotated and their factor matrices interpreted in terms of content of the variables that loaded most highly.
The major findings were that there exists high rainfall variation within Lusaka Province whilst coefficients of variation show that Lusaka Province displays no evident trend. It has been established that it were wet spells in drought years that increased maize yields. Lusaka is prone to one-year droughts with the most severe droughts not being the most intense droughts. It has been discovered that before 1988 few factors influenced high maize yields whilst after 1989 the factors at interplay doubled causing Lusaka Province to plummet in rank in level of production. The conclusion was that there was an increase in the length of the growing season without a corresponding increase in maize yield due to the strong influence of the Southern Oscillation Index and Sea Surface Temperatures on rainfall variability. For purposes of implementing study results, recommendations were made. These included the need for an effective early warning unit, adapting farming to wet spells, improved input provision and marketing, and need for further research on individual agricultural factors. Application of study results should help farmers and agricultural officers in adopting the right kind of farming methods adapted to the changing environment and agricultural practices in the country
Subjects/Keywords: Rainfall intensity duration frequencies – Zambia
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Manager
APA (6th Edition):
Banda, K. (2011). Impact of rainfall variability and agricultural factors on maize yeild in Lusaka Province, 1976 to 2002
. (Thesis). University of Zambia. Retrieved from http://hdl.handle.net/123456789/645
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Banda, Kamuna,Ackim. “Impact of rainfall variability and agricultural factors on maize yeild in Lusaka Province, 1976 to 2002
.” 2011. Thesis, University of Zambia. Accessed December 13, 2019.
http://hdl.handle.net/123456789/645.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Banda, Kamuna,Ackim. “Impact of rainfall variability and agricultural factors on maize yeild in Lusaka Province, 1976 to 2002
.” 2011. Web. 13 Dec 2019.
Vancouver:
Banda K. Impact of rainfall variability and agricultural factors on maize yeild in Lusaka Province, 1976 to 2002
. [Internet] [Thesis]. University of Zambia; 2011. [cited 2019 Dec 13].
Available from: http://hdl.handle.net/123456789/645.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Banda K. Impact of rainfall variability and agricultural factors on maize yeild in Lusaka Province, 1976 to 2002
. [Thesis]. University of Zambia; 2011. Available from: http://hdl.handle.net/123456789/645
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cape Peninsula University of Technology
8.
Lind, Jules.
Effect of synthesis duration and HCl acid concentration on the formation of hydrothermally synthesised TiO2 nanoparticles
.
Degree: 2015, Cape Peninsula University of Technology
URL: http://etd.cput.ac.za/handle/20.500.11838/922
► It is known when synthesising nanomaterial on laboratory scale, a variation in a single synthesis parameter may alter the product. Numerous synthesis techniques have been…
(more)
▼ It is known when synthesising nanomaterial on laboratory scale, a variation in a single synthesis parameter may alter the product. Numerous synthesis techniques have been employed in the synthesis of titanium dioxide with varying phase, size and shape. It was found that changes in the phase directly affect their properties and application, such as treating of textile wastewater by photodegradation. However, when synthesising nanoparticles, changes to any reaction parameters and/or kinetics can have a desirable or undesirable effect on titanium dioxide nanoparticles. There is therefore a need to understand how HCl acid concentration (homogeneous catalyst) and shortened gel formation duration affect synthesis of TiO2 nanoparticles and photocatalytic properties.
A sol-gel followed by hydrothermal treatment was employed to synthesise 2.8 grams of titanium dioxide nanorods for the duration of 96 hours, initially. A systematic study was conducted to exploit reaction kinetics by varying HCl acid concentration (3, 4, 5 molar), water feed for TiO2 gel formation (72, 24, 12 hours), and hydrothermal treatment time for the transformation of gel to crystalline TiO2 (1–20 hours). The photocatalytic activity of synthesised TiO2 nanoparticle was evaluated, when irradiated with a UV-C bulb to degrade an industrial textile dye, methylene blue. Systematic studies were successful in identifying the effects HCl acid concentration, gel formation time and lengthened hydrothermal treatment time have on TiO2 nanoparticles’ phase, size and shape. Increased HCl concentrations for shortened gel formation times resulted in mixed phases of TiO2, decreases in particle size and particle shape deformed from nanorods. Increased photocatalytic activity was found for a decrease in the rutile and increase in the brookite phase percentage, but this plateaued after 42% brookite phase. Furthermore, lengthened hydrothermal treatment assisted in phase transformation of particles synthesised at shortened gel formation times for high HCl acid concentrations. Pure rutile TiO2 was synthesised at a sixth of the initial synthesis time. Furthermore, the effects of changes in nanoparticles on the photocatalytic activity was discussed. Moreover, exploiting reaction kinetics resulted in the synthesis of a more efficient photocatalytically active TiO2 nanoparticle sample at shortened synthesis time.
Subjects/Keywords: HCl acid;
TiO2;
Synthesis duration
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APA (6th Edition):
Lind, J. (2015). Effect of synthesis duration and HCl acid concentration on the formation of hydrothermally synthesised TiO2 nanoparticles
. (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/922
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lind, Jules. “Effect of synthesis duration and HCl acid concentration on the formation of hydrothermally synthesised TiO2 nanoparticles
.” 2015. Thesis, Cape Peninsula University of Technology. Accessed December 13, 2019.
http://etd.cput.ac.za/handle/20.500.11838/922.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lind, Jules. “Effect of synthesis duration and HCl acid concentration on the formation of hydrothermally synthesised TiO2 nanoparticles
.” 2015. Web. 13 Dec 2019.
Vancouver:
Lind J. Effect of synthesis duration and HCl acid concentration on the formation of hydrothermally synthesised TiO2 nanoparticles
. [Internet] [Thesis]. Cape Peninsula University of Technology; 2015. [cited 2019 Dec 13].
Available from: http://etd.cput.ac.za/handle/20.500.11838/922.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lind J. Effect of synthesis duration and HCl acid concentration on the formation of hydrothermally synthesised TiO2 nanoparticles
. [Thesis]. Cape Peninsula University of Technology; 2015. Available from: http://etd.cput.ac.za/handle/20.500.11838/922
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Victoria
9.
Fisher, Mischa.
CPU product line lifecycles: econometric duration analysis using parametric and non-parametric estimators.
Degree: Department of Economics, 2018, University of Victoria
URL: https://dspace.library.uvic.ca//handle/1828/9294
► This thesis provides a comprehensive history of the statistical background and uses of survival analysis, and then applies econometric duration analysis to examine the lifecycles…
(more)
▼ This thesis provides a comprehensive history of the statistical background and uses of survival analysis, and then applies econometric
duration analysis to examine the lifecycles of product lines within the microprocessor industry. Using data from Stanford University's CPUDB, covering Intel and AMD processors introduced between 1971 and 2014, the
duration analysis uses both parametric and nonparametric estimators to construct survival and hazard functions for estimated product line lifetimes within microprocessor product families. The well-known and widely applied non-parametric Kaplan-Meier estimator is applied on both the entire sample as a whole, and segmented estimate that considers product line lifecycles of Intel and AMD separately, with median survival time of 456 days. The parametric
duration analysis uses both the semi-parametric Cox proportional hazard model, and the fully parametric accelerated failure time model across the Weibull, Exponential and Log-Logistic distributions, which find modest association between higher clock speed and transistor count on diminishing expected time in the marketplace for microprocessors, while the number of cores and other attributes have no predictive power over expected survival times. It is expected that the transistor count and clock speed of a given processor's negative effect on expected
duration, likely captures the co-trending of growth in transistor count with a larger marketplace and broader product categories.
Advisors/Committee Members: Stewart, Kenneth G. (supervisor).
Subjects/Keywords: Duration Analysis; CPU; Econometrics
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APA (6th Edition):
Fisher, M. (2018). CPU product line lifecycles: econometric duration analysis using parametric and non-parametric estimators. (Masters Thesis). University of Victoria. Retrieved from https://dspace.library.uvic.ca//handle/1828/9294
Chicago Manual of Style (16th Edition):
Fisher, Mischa. “CPU product line lifecycles: econometric duration analysis using parametric and non-parametric estimators.” 2018. Masters Thesis, University of Victoria. Accessed December 13, 2019.
https://dspace.library.uvic.ca//handle/1828/9294.
MLA Handbook (7th Edition):
Fisher, Mischa. “CPU product line lifecycles: econometric duration analysis using parametric and non-parametric estimators.” 2018. Web. 13 Dec 2019.
Vancouver:
Fisher M. CPU product line lifecycles: econometric duration analysis using parametric and non-parametric estimators. [Internet] [Masters thesis]. University of Victoria; 2018. [cited 2019 Dec 13].
Available from: https://dspace.library.uvic.ca//handle/1828/9294.
Council of Science Editors:
Fisher M. CPU product line lifecycles: econometric duration analysis using parametric and non-parametric estimators. [Masters Thesis]. University of Victoria; 2018. Available from: https://dspace.library.uvic.ca//handle/1828/9294
Clemson University
10.
Sinanovic, Senad.
Essays on Unemployment Duration in Germany.
Degree: PhD, Economics, 2018, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/2186
► Unemployment duration is critical when evaluating economic policies. In my dissertation, I examine: i) the gender differences in unemployment duration, ii) the effects of housing…
(more)
▼ Unemployment
duration is critical when evaluating economic policies. In my dissertation, I examine: i) the gender differences in unemployment
duration, ii) the effects of housing tenure on unemployment
duration, and iii) the differences in determinants of unemployment between East and West Germans. Despite the evidence of gender differences in
duration of unemployment, its determinants remain not well understood. This paper aims to address the gap in the literature on determinants of unemployment by studying the differences in unemployment
duration between genders and within-gender groups of East and West Germans. I construct unemployment spells from the German Socio-Economic Panel for 1990-2011 to shed more light on the differentials and their association with a partner and children. A simple comparison of median durations and survival functions shows that women's unemployment spells are twice as long as men's, and that these differences nearly triple during the child-bearing and -rearing ages, regardless of location. I find that the differences in unemployment
duration between genders are associated with the presence of young children and a partner. Women's unemployment hazard rates are between 40 and 80 percentage points lower in the presence of children aged 0-4 than comparable men's hazard rates. In addition, West German men and women have hazard rates 20 and 25 percentage points lower than comparable East Germans, even after controlling for non-labor income. I find that the differential in unemployment
duration between Eastern and Western females is associated with the differential effect of young children and a partner. These findings are robust after accounting for unobserved heterogeneity. Homeownership is associated with positive outcomes such as urban sprawl, enacting zoning laws, and lowering crime rates, but there is also evidence of homeownership reducing labor mobility. This paper examines the effects of homeownership on unemployment lengths in Germany. I use unemployment spells from the German Socio-Economic Panel for the period 1990-2011 to estimate the effect of homeownership on unemployment length while controlling for possible self-selection into homeownership. The data suggests that homeowners experience two months shorter
duration of unemployment which translates to a 13 percent higher rate of exits from unemployment after controlling for observables. However, after controlling for self-selection into homeownership, I find that homeownership significantly decreases the exit rate out of unemployment by 56 percent compared to renters. Since the unification of East and West Germany, East Germany underwent economic and institutional transitions which were followed by soaring and persistent unemployment. Previous literature shows that there are tenacious differences between East and West Germans in unemployment
duration and its determinants during first nine years after unification. In this paper, I use the data from the German Socio-Economic Panel to shed light on the differences in…
Advisors/Committee Members: Dr. Paul W. Wilson, Committee Chair, Dr. Babur De los Santos, Committee Co-Chair, Dr. Scott Baier, Dr. Chungsang Lam.
Subjects/Keywords: gender differences; unemployment duration
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APA (6th Edition):
Sinanovic, S. (2018). Essays on Unemployment Duration in Germany. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/2186
Chicago Manual of Style (16th Edition):
Sinanovic, Senad. “Essays on Unemployment Duration in Germany.” 2018. Doctoral Dissertation, Clemson University. Accessed December 13, 2019.
https://tigerprints.clemson.edu/all_dissertations/2186.
MLA Handbook (7th Edition):
Sinanovic, Senad. “Essays on Unemployment Duration in Germany.” 2018. Web. 13 Dec 2019.
Vancouver:
Sinanovic S. Essays on Unemployment Duration in Germany. [Internet] [Doctoral dissertation]. Clemson University; 2018. [cited 2019 Dec 13].
Available from: https://tigerprints.clemson.edu/all_dissertations/2186.
Council of Science Editors:
Sinanovic S. Essays on Unemployment Duration in Germany. [Doctoral Dissertation]. Clemson University; 2018. Available from: https://tigerprints.clemson.edu/all_dissertations/2186
McMaster University
11.
D'Alessandro, Marc.
Development of Intensity-Duration-Frequency Curves Using Local and Regional Scale Methods.
Degree: MSc, 2016, McMaster University
URL: http://hdl.handle.net/11375/20602
► Traditionally civil infrastructure designs were rendered using rainfall data from dated historical records. However, recent studies have shown that the magnitude and intensity of historical…
(more)
▼ Traditionally civil infrastructure designs were rendered using rainfall data from dated historical records. However, recent studies have shown that the magnitude and intensity of historical precipitation events do not exhibit the extreme nature of precipitation events that are projected to occur in the future. Increasing extreme rainfall trends have already been documented in Canada. Therefore there are growing concerns that the aging infrastructure in southern Ontario will be unable to function effectively and as a result the frequency of floods is expected to increase. Updating intensity-duration-frequency (IDF) curves to account for extreme precipitation events is vital to ensure that the consequences of floods are mitigated. This study first reviewed the most robust techniques for updating IDF curves, and applied a select set of approaches to create IDF curves for stations within southern Ontario.
Three robust techniques – the at-site method, the regional frequency analysis method, and a future IDF curve development technique – were compared with one another to determine which technique was most suitable for updating IDF curves in southern Ontario. Results showed that the difference between the at-site method and the regional frequency analysis method was marginal for short return periods, however for larger return periods larger differences were observed. Future IDF statistic results showed that for the 2050s there were minor differences in the increases in rainfall intensities when comparing with the at-site and the regional frequency analysis method. For the 2100s there were larger increases in rainfall intensities compared to the at-site and the regional frequency analysis method, especially for larger return periods. These results suggest that it is worthwhile for regions within southern Ontario to update their IDF curves using the future IDF curve technique, however it is recommended that additional climate models, emission scenarios and downscaling techniques involved in future IDF curve construction are explored.
Thesis
Master of Science (MSc)
Advisors/Committee Members: Coulibaly, Paulin, Earth Sciences.
Subjects/Keywords: Intensity-Duration-Frequency; flooding
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APA (6th Edition):
D'Alessandro, M. (2016). Development of Intensity-Duration-Frequency Curves Using Local and Regional Scale Methods. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/20602
Chicago Manual of Style (16th Edition):
D'Alessandro, Marc. “Development of Intensity-Duration-Frequency Curves Using Local and Regional Scale Methods.” 2016. Masters Thesis, McMaster University. Accessed December 13, 2019.
http://hdl.handle.net/11375/20602.
MLA Handbook (7th Edition):
D'Alessandro, Marc. “Development of Intensity-Duration-Frequency Curves Using Local and Regional Scale Methods.” 2016. Web. 13 Dec 2019.
Vancouver:
D'Alessandro M. Development of Intensity-Duration-Frequency Curves Using Local and Regional Scale Methods. [Internet] [Masters thesis]. McMaster University; 2016. [cited 2019 Dec 13].
Available from: http://hdl.handle.net/11375/20602.
Council of Science Editors:
D'Alessandro M. Development of Intensity-Duration-Frequency Curves Using Local and Regional Scale Methods. [Masters Thesis]. McMaster University; 2016. Available from: http://hdl.handle.net/11375/20602
Uppsala University
12.
Rönnberg, Christina.
Svenskfödda och utlandsfödda kvinnors amningsplanering och amningsduration.
Degree: Public Health and Caring Sciences, 2015, Uppsala University
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-266881
► Background: In Sweden, the breastfeeding rate has decreased in recent years. Breastfeeding provides short-term and long-term health effects of the child and the woman.…
(more)
▼ Background: In Sweden, the breastfeeding rate has decreased in recent years. Breastfeeding provides short-term and long-term health effects of the child and the woman. Objective: The aim of this study was to investigate planning and duration of breastfeeding, and examine whether there were differences between Swedish-born and foreign-born women regarding duration of breastfeeding during the child's first year. Design / Methodology: This is a survey in which 3390 women responded to a questionnaire at enrollment prenatal, 2581 women responded to a questionnaire in late pregnancy and 1257 women responded one year after pregnancy. The material was analyzed with descriptive statistics. Results: There were 1135 women who responded to both questionnaires regarding planning and duration of breastfeeding. A significant difference was found between the planned breastfeeding and duration of breastfeeding. There were 260 women who breastfed for a shorter period and 265 who breastfed for a longer period than they had planned. This issue included all women regardless of country of birth. A large proportion of women who breastfed the child at the age of 12 months wanted to continue breastfeeding until the baby was 1-1.5 years or as long as the child himself wanted. It showed no difference regarding duration of breastfeeding between Swedish-born and foreign-born women. The most common reasons why women chose not to breastfeed was that the woman or the child did not want to. The most common reasons that women choose to stop breastfeeding was that the child did not get satisfied or that the child did not want to suckle. Conclusion: Differences were observed regarding breastfeeding planning and duration of breastfeeding. Care needs to focus on providing support and education to women in order to increase motivation to breastfeeding.
Subjects/Keywords: Breastfeeding; duration; ethnicity; planning
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APA (6th Edition):
Rönnberg, C. (2015). Svenskfödda och utlandsfödda kvinnors amningsplanering och amningsduration. (Thesis). Uppsala University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-266881
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rönnberg, Christina. “Svenskfödda och utlandsfödda kvinnors amningsplanering och amningsduration.” 2015. Thesis, Uppsala University. Accessed December 13, 2019.
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-266881.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rönnberg, Christina. “Svenskfödda och utlandsfödda kvinnors amningsplanering och amningsduration.” 2015. Web. 13 Dec 2019.
Vancouver:
Rönnberg C. Svenskfödda och utlandsfödda kvinnors amningsplanering och amningsduration. [Internet] [Thesis]. Uppsala University; 2015. [cited 2019 Dec 13].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-266881.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rönnberg C. Svenskfödda och utlandsfödda kvinnors amningsplanering och amningsduration. [Thesis]. Uppsala University; 2015. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-266881
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
13.
Holmlund, Erik.
Perceptual fluency and duration judgments : An experimental study regarding the effect of fluency on perception of time.
Degree: Psychology, 2016, Umeå University
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-121835
► This study investigated whether perceptual fluency could affect duration judgments. Fluency refers to levels of subjective ease, in which stimuli can be processed (Lanska,…
(more)
▼ This study investigated whether perceptual fluency could affect duration judgments. Fluency refers to levels of subjective ease, in which stimuli can be processed (Lanska, Olds, & Westerman, 2014). The study was conducted with experimental within group factorial design. Visual stimuli were selected from Snodgrass and Vanderwarts (1980) standardized set of 260 pictures. Pairs were made with low and high levels of complexity. Duration was about 1000 milliseconds with .10 variations. 1/3 of pairs were without variation. Participants were asked to judge which image was presented for longest time. Total amount of participants was 37. Main hypothesis was that low levels of complexity would be judged, to a greater frequency, as having been presented for longer duration. Observed mean (M= 20.27, SD = 2.90) was slightly lower than level of chance (M = 21) and the difference was non significant, t(36) = -1.53, p > .13. The null hypothesis was not rejected.
Subjects/Keywords: Perceptual fluency; fluency; duration judgments
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MLA ·
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Export
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APA (6th Edition):
Holmlund, E. (2016). Perceptual fluency and duration judgments : An experimental study regarding the effect of fluency on perception of time. (Thesis). Umeå University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-121835
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Holmlund, Erik. “Perceptual fluency and duration judgments : An experimental study regarding the effect of fluency on perception of time.” 2016. Thesis, Umeå University. Accessed December 13, 2019.
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-121835.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Holmlund, Erik. “Perceptual fluency and duration judgments : An experimental study regarding the effect of fluency on perception of time.” 2016. Web. 13 Dec 2019.
Vancouver:
Holmlund E. Perceptual fluency and duration judgments : An experimental study regarding the effect of fluency on perception of time. [Internet] [Thesis]. Umeå University; 2016. [cited 2019 Dec 13].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-121835.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Holmlund E. Perceptual fluency and duration judgments : An experimental study regarding the effect of fluency on perception of time. [Thesis]. Umeå University; 2016. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-121835
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waterloo
14.
Klein, Michael.
Comparing the Estimation of Internally and Externally Defined Interval Durations.
Degree: 2019, University of Waterloo
URL: http://hdl.handle.net/10012/14364
► In this thesis I distinguish between two types of temporal intervals: internally-defined and externally-defined. Prior research on how humans estimate the durations of temporal intervals…
(more)
▼ In this thesis I distinguish between two types of temporal intervals: internally-defined and
externally-defined. Prior research on how humans estimate the durations of temporal intervals has
been focussed almost entirely on externally-defined intervals. Because internally-defined intervals
have been largely ignored, our level of understanding of how people estimate the durations of these
intervals rests on whether they do so using roughly the same set of mental processes as for
externally-defined intervals. I sought to collect some initial evidence regarding whether people do
indeed estimate the two types of durations using similar processes. A key finding was that
estimating the duration of an externally-defined interval (a stimulus on a computer screen)
interfered with performance on a concurrent task whereas estimating the duration of an internally
defined interval (a response time) did not (Chapter 2). This finding extended to several different
temporal and non-temporal tasks (Chapter 3). The results indicate that processes underlying
estimation of internally-defined intervals may differ in meaningful ways from those underlying
estimation of externally-defined intervals.
Subjects/Keywords: duration estimation; attention; time perception
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APA ·
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Export
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APA (6th Edition):
Klein, M. (2019). Comparing the Estimation of Internally and Externally Defined Interval Durations. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/14364
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Klein, Michael. “Comparing the Estimation of Internally and Externally Defined Interval Durations.” 2019. Thesis, University of Waterloo. Accessed December 13, 2019.
http://hdl.handle.net/10012/14364.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Klein, Michael. “Comparing the Estimation of Internally and Externally Defined Interval Durations.” 2019. Web. 13 Dec 2019.
Vancouver:
Klein M. Comparing the Estimation of Internally and Externally Defined Interval Durations. [Internet] [Thesis]. University of Waterloo; 2019. [cited 2019 Dec 13].
Available from: http://hdl.handle.net/10012/14364.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Klein M. Comparing the Estimation of Internally and Externally Defined Interval Durations. [Thesis]. University of Waterloo; 2019. Available from: http://hdl.handle.net/10012/14364
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Minnesota
15.
Wiczer, David Geoffrey.
Essays in macro and labor economics.
Degree: PhD, Economics, 2013, University of Minnesota
URL: http://purl.umn.edu/156383
► The first chapter studies the rate of long-term unemployment, which spiked during the Great Recession. To help explain this, I exploit the systematic and counter-cyclical…
(more)
▼ The first chapter studies the rate of long-term unemployment, which spiked during the Great Recession. To help explain this, I exploit the systematic and counter-cyclical differences in unemployment duration across occupations. This heterogeneity extends the tail of the unemployment duration distribution, which is necessary to account for the observed level of long-term unemployment and its increase since 2007. This chapter introduces a model in which unemployment duration and occupation are linked; it measures the effects of occupation-specific shocks and skills on unemployment duration. Here, a worker will be paid more for human capital in his old occupation but a bad shock may make those jobs scarce. Still, their human capital partly ``attaches'' them to their prior occupation, even when searching there implies a longer expected duration. Hence, unemployment duration rises and becomes more dispersed across occupations. Redistributive shocks and business cycles, as in the Great Recession, exacerbate this effect.
For quantitative discipline, the model matches data on the wage premium to occupational experience and the co-movement of occupations' productivity. The distribution of duration is then endogenous. For comparison's sake, if a standard model with homogeneous job seekers matches the job finding rate, then it also determines expected duration and understates it. That standard model implies just over half of the long-term unemployment in 1976-2007 and almost no rise in the recent recession. But, with heterogeneity by occupation, this chapter nearly matches long-term unemployment in the period 1976-2007 and 70% of its rise during the Great Recession.
The second chapter studies the link between wage growth and the match of a worker's occupation and skills. The notion here is that if human capital accumulation depends on match quality, poor matches can have long-lasting effects on lifetime earnings. I build a model that incorporates such a mechanism, in which human capital accumulation is affected by imperfect information about one's self. This informational friction leads to matches in which a worker accumulates human capital more slowly and has weaker earnings growth.
To get direct evidence, the chapter pieces together two sets of data on the skills used by an occupation and the skills a worker is particularly good at. Data on occupations describes occupations by the intensity with which they use many dimensions of workers' knowledge, skills and abilities. To pair, we have data on tests taken by respondents in a panel that tracks occupations and earnings. The test designers created a mapping between their tests and the occupational descriptors, which allows us to create two measures. The first measure of match quality is just the dot product between the dimensions of workers' skills and utilization rate of these skills by occupations. The second measure mismatch relative to an optimal matching computed using the Gale-Shapley algorithm for stable pairs. In both, worse matches have significantly slower…
Subjects/Keywords: Duration; Heterogeneity; Occupation; Unemployment; Wages
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APA (6th Edition):
Wiczer, D. G. (2013). Essays in macro and labor economics. (Doctoral Dissertation). University of Minnesota. Retrieved from http://purl.umn.edu/156383
Chicago Manual of Style (16th Edition):
Wiczer, David Geoffrey. “Essays in macro and labor economics.” 2013. Doctoral Dissertation, University of Minnesota. Accessed December 13, 2019.
http://purl.umn.edu/156383.
MLA Handbook (7th Edition):
Wiczer, David Geoffrey. “Essays in macro and labor economics.” 2013. Web. 13 Dec 2019.
Vancouver:
Wiczer DG. Essays in macro and labor economics. [Internet] [Doctoral dissertation]. University of Minnesota; 2013. [cited 2019 Dec 13].
Available from: http://purl.umn.edu/156383.
Council of Science Editors:
Wiczer DG. Essays in macro and labor economics. [Doctoral Dissertation]. University of Minnesota; 2013. Available from: http://purl.umn.edu/156383
University of Connecticut
16.
McGraw, Daniel.
Evaluation of NEXRAD-based sub-daily Intensity Duration Frequency Curves over CONUS.
Degree: MS, Environmental Engineering, 2018, University of Connecticut
URL: https://opencommons.uconn.edu/gs_theses/1190
► The establishment of design storm parameters is a critical step in hydrologic design and flood-risk management. Intensity-duration-frequency (IDF) curves are commonly used as they…
(more)
▼ The establishment of design storm parameters is a critical step in hydrologic design and flood-risk management. Intensity-
duration-frequency (IDF) curves are commonly used as they yield the expected intensity of a given storm
duration and frequency of occurrence. Due to the long record length and reliability of the data, rain gauges have been used historically to generate at-point IDF curves. However, limitation in gauge coverage or distribution can result in uncertainties in IDF generation from the data interpolation methods. A potential solution to this limitation is the incorporation of radar-based Quantitative Precipitation Estimates (QPEs) in deriving IDF relationships. Radar-based estimates offer areal coverage where rain gauges may not exist, however are associated with other limitations such as the space/time resolution of the radar measurement and also errors from atmospheric attenuation, beam blockage, and range effect.
The objective of this work is to evaluate the usability of radar-based estimates for deriving IDF curves. Evaluation is carried out over continental United States, focusing on the major climatic zones defined by the Koppen climate classification system, along with a separate evaluation grouping based on an elevation threshold. The Radar QPE are based on the National Weather Service Stage IV data, a bias corrected product mosaicked over the continental United States at 4km spatial and hourly temporal resolution. Reference precipitation estimates were based on NOAA hourly gauge observations available from 1948 to 2017.
The gauges were selected through a quality control process to assure gauges had at least 50 years of record with less than 10% of missing data. The radar pixels covering the location of the gauges were selected for comparison. To compare between the short record lengths of the radar product (2002-2017), the annual maximum series of each gauge was sampled with replacement into a synthetic 15-year annual maximum series and bootstrapped 1000 times. IDF relationships were generated by fitting a generalized extreme value distribution to the annual maximum series for durations of 1 h, 3 h, 6h, 12 h, and 24 h.
The results of the analysis highlight the uncertainty in radar-based IDF curves due to the short record length of the radar QPE uncertainty and further emphasize the geographical dependence of the accuracy in IDF estimates. Findings from this study are expected to offer valuable insight on the analysis of radar-based rainfall climatology for hydrologic designs and further advance current knowledge on the use of remote sensing observations for frequency analysis of precipitation extremes.
Advisors/Committee Members: Emmanouil Anagnostou, Efthymios Nikolopoulos, Xinyi Shen, Emmanouil Anagnostou.
Subjects/Keywords: NEXRAD; IDF; Intensity-duration-frequency
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APA (6th Edition):
McGraw, D. (2018). Evaluation of NEXRAD-based sub-daily Intensity Duration Frequency Curves over CONUS. (Masters Thesis). University of Connecticut. Retrieved from https://opencommons.uconn.edu/gs_theses/1190
Chicago Manual of Style (16th Edition):
McGraw, Daniel. “Evaluation of NEXRAD-based sub-daily Intensity Duration Frequency Curves over CONUS.” 2018. Masters Thesis, University of Connecticut. Accessed December 13, 2019.
https://opencommons.uconn.edu/gs_theses/1190.
MLA Handbook (7th Edition):
McGraw, Daniel. “Evaluation of NEXRAD-based sub-daily Intensity Duration Frequency Curves over CONUS.” 2018. Web. 13 Dec 2019.
Vancouver:
McGraw D. Evaluation of NEXRAD-based sub-daily Intensity Duration Frequency Curves over CONUS. [Internet] [Masters thesis]. University of Connecticut; 2018. [cited 2019 Dec 13].
Available from: https://opencommons.uconn.edu/gs_theses/1190.
Council of Science Editors:
McGraw D. Evaluation of NEXRAD-based sub-daily Intensity Duration Frequency Curves over CONUS. [Masters Thesis]. University of Connecticut; 2018. Available from: https://opencommons.uconn.edu/gs_theses/1190
Northeastern University
17.
Terrado, Kate.
What time is it: signatures of duration.
Degree: M.F.A., Department of Art + Design, 2018, Northeastern University
URL: http://hdl.handle.net/2047/D20289839
► Designs immediate challenge is not optimizing the way we approach the pragmatic it is about establishing an understanding of the endurance and duration of the…
(more)
▼ Designs immediate challenge is not optimizing the way we approach the pragmatic it is about establishing an understanding of the endurance and duration of the artifacts we make. This thesis argues for the integration of temporal principles into the process and practice of design; it encompasses experiments as a way to reflect on and articulate the values of duration. Understanding temporal form as it relates to design gives a better view into the potential of broader possibilities, as well as a more robust and precise way to describe choices and preferences.
Subjects/Keywords: design; duration; temporal form; time
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APA (6th Edition):
Terrado, K. (2018). What time is it: signatures of duration. (Masters Thesis). Northeastern University. Retrieved from http://hdl.handle.net/2047/D20289839
Chicago Manual of Style (16th Edition):
Terrado, Kate. “What time is it: signatures of duration.” 2018. Masters Thesis, Northeastern University. Accessed December 13, 2019.
http://hdl.handle.net/2047/D20289839.
MLA Handbook (7th Edition):
Terrado, Kate. “What time is it: signatures of duration.” 2018. Web. 13 Dec 2019.
Vancouver:
Terrado K. What time is it: signatures of duration. [Internet] [Masters thesis]. Northeastern University; 2018. [cited 2019 Dec 13].
Available from: http://hdl.handle.net/2047/D20289839.
Council of Science Editors:
Terrado K. What time is it: signatures of duration. [Masters Thesis]. Northeastern University; 2018. Available from: http://hdl.handle.net/2047/D20289839
NSYSU
18.
Chen, Hui-Yui.
The Effectiveness Study of THSRC Operation Organization.
Degree: Master, EMBA, 2014, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0628114-160849
► The Government of the Republic of China has awarded the Taiwan High Speed Railway Co.(THSRC) a concession to design, build and operate a high speed…
(more)
▼ The Government of the Republic of China has awarded the Taiwan High Speed Railway Co.(THSRC) a concession to design, build and operate a high speed railway in west Taiwan. The concession period is 35 years commencing from July 1998 and all the revenue operation shall be followed the agreement with government within the concession period. Revenue operation has been conducted since January 2007 after the completion of construction, and it has experienced more than seven years. The high speed railway offers journey time around 90 minutes from Taipei in the north to Kaohsiung in the south. It makes Taiwan into a new stage of âone day peripheral circleâ and it becomes major vehicle in the west corridors approximately 345km from Taipei in the north to Kaohsiung in the south.
High Speed Railway(HSR) project has been planned during Taiwanâs rapidly economic growth period, and all the five major private investors have much optimism on financial and ridership. In order to speed up the HSR construction their have more than 2,000 professional engineers from 20 countries to join the project and lot of them have been transferred into operation organization in the later. Their shall have many discrepancies in the organization management between construction
duration and operation
duration, however the management regime of construction was seldom changed. It would not only cause some activities of revenue operation with inconsistent and low effectiveness, but also make operation cost increasing. Additionally ridership cannot reach the expected target has also cause financial difficulties.
The study is using company strategic, material procurement & management and engineering elements to investigate the key factors of operation organization with low effectiveness through HSR maintainer opinion.
Now no matter the operation strategic of THSRC is project finance or sustainable management, reducing operation cost would be the major strategic to be faced in the near future. It is expected the studying can be as a reference by operator to consider reduction operation cost.
Advisors/Committee Members: Bih-Shiaw Jaw (committee member), Ming-Chu Yu (chair), Christina Yu-ping Wang (committee member), Meng-Siou Li (chair).
Subjects/Keywords: Construction Duration; Operation Duration; BOT(Built Operation & Transfer)
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APA (6th Edition):
Chen, H. (2014). The Effectiveness Study of THSRC Operation Organization. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0628114-160849
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chen, Hui-Yui. “The Effectiveness Study of THSRC Operation Organization.” 2014. Thesis, NSYSU. Accessed December 13, 2019.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0628114-160849.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chen, Hui-Yui. “The Effectiveness Study of THSRC Operation Organization.” 2014. Web. 13 Dec 2019.
Vancouver:
Chen H. The Effectiveness Study of THSRC Operation Organization. [Internet] [Thesis]. NSYSU; 2014. [cited 2019 Dec 13].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0628114-160849.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chen H. The Effectiveness Study of THSRC Operation Organization. [Thesis]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0628114-160849
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Dalhousie University
19.
Brown, Catherine.
RATES AND DETERMINANTS OF BREASTFEEDING EXCLUSIVITY AND
DURATION IN NOVA SCOTIA WOMEN.
Degree: MS, Department of Community Health &
Epidemiology, 2012, Dalhousie University
URL: http://hdl.handle.net/10222/15236
► This population-based retrospective cohort study describes breastfeeding patterns and identifies the determinants of longer exclusive breastfeeding among 4,533 mother-infants pairs in two regions of Nova…
(more)
▼ This population-based retrospective cohort study
describes breastfeeding patterns and identifies the determinants of
longer exclusive breastfeeding among 4,533 mother-infants pairs in
two regions of Nova Scotia, Canada between 2006 and 2009.
Multivariate logistic and proportional hazard regression analyses
were used to model breastfeeding practices. While 64.1% (95%
CI=62.7-65.5) of mothers initiated breastfeeding, only 10.4%
(9.5-11.4) of mothers exclusively breastfed for the recommended six
months; 21% (19.7-22.3) of mothers continued to breastfeed at six
months, but not exclusively. Six risk factors are independently
associated with poorer breastfeeding practices: lower maternal
education, no partner, higher pre-pregnancy body mass index,
smoking during pregnancy, no breast contact between dyads within
one hour of birth, and no intention of breastfeeding. Rates of
exclusive breastfeeding remain lower in these districts than
elsewhere in Canada. Understanding determinants of longer exclusive
breastfeeding is critical to assist policy makers and health care
providers in better supporting mothers and newborns.
Advisors/Committee Members: N/A (external-examiner), Dr. Kathleen MacPherson (graduate-coordinator), Dr. Donald Langille (thesis-reader), Dr. Gordon Flowerdew (thesis-reader), Dr. Linda Dodds (thesis-reader), Dr. Linda Dodds (thesis-supervisor), Received (ethics-approval), Not Applicable (manuscripts), Not Applicable (copyright-release).
Subjects/Keywords: Breastfeeding duration; exclusive breastfeeding; Nova
Scotia; determinants
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APA (6th Edition):
Brown, C. (2012). RATES AND DETERMINANTS OF BREASTFEEDING EXCLUSIVITY AND
DURATION IN NOVA SCOTIA WOMEN. (Masters Thesis). Dalhousie University. Retrieved from http://hdl.handle.net/10222/15236
Chicago Manual of Style (16th Edition):
Brown, Catherine. “RATES AND DETERMINANTS OF BREASTFEEDING EXCLUSIVITY AND
DURATION IN NOVA SCOTIA WOMEN.” 2012. Masters Thesis, Dalhousie University. Accessed December 13, 2019.
http://hdl.handle.net/10222/15236.
MLA Handbook (7th Edition):
Brown, Catherine. “RATES AND DETERMINANTS OF BREASTFEEDING EXCLUSIVITY AND
DURATION IN NOVA SCOTIA WOMEN.” 2012. Web. 13 Dec 2019.
Vancouver:
Brown C. RATES AND DETERMINANTS OF BREASTFEEDING EXCLUSIVITY AND
DURATION IN NOVA SCOTIA WOMEN. [Internet] [Masters thesis]. Dalhousie University; 2012. [cited 2019 Dec 13].
Available from: http://hdl.handle.net/10222/15236.
Council of Science Editors:
Brown C. RATES AND DETERMINANTS OF BREASTFEEDING EXCLUSIVITY AND
DURATION IN NOVA SCOTIA WOMEN. [Masters Thesis]. Dalhousie University; 2012. Available from: http://hdl.handle.net/10222/15236
California State University – Northridge
20.
Over, Jonathan David.
Irradiance modeling for solar powered aircraft.
Degree: MS, Department of Mechanical Engineering, 2012, California State University – Northridge
URL: http://hdl.handle.net/10211.2/1622
► Starting from the Sun and accounting for every scintilla of irradiance lost on the way to the surface of a solar array, sizing solar arrays…
(more)
▼ Starting from the Sun and accounting for every scintilla of irradiance lost on the way to the surface of a solar array, sizing solar arrays for sustained flight is an optimization problem that balances power requirements and mass limitations in aviation. Accounting for each step is arduous but rudiment. The work presented here accomplishes that task and will be used to construct a working aircraft model by the CSUN Engineering Design Team for research purposes as well as for competition use. The methodology incorporated for this work involved extensive use of theoretical and empirical models as well as historical meteorological data. The conglomeration of equations, relations, and tables were uniformly analyzed and optimized using several Microsoft Excel Spreadsheets. Conclusive results and graphs confirmed that the irradiance at any given time is the driving parameter in calculating the daily solar energy per square meter and the maximum solar power required. In the case of irradiance calculations, percent differences compared to historical data were less than 2%. The crux of this work is the accurate irradiance predictions, maximizing performance of solar arrays and satisfying power requirements stipulated by any application, particularly in the case for an aircraft.
Advisors/Committee Members: Fox, Timothy W. (advisor), Schwartz, Sidney H. (committee member).
Subjects/Keywords: daylight duration; Dissertations, Academic – CSUN – Engineering – Mechanical.
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APA (6th Edition):
Over, J. D. (2012). Irradiance modeling for solar powered aircraft. (Masters Thesis). California State University – Northridge. Retrieved from http://hdl.handle.net/10211.2/1622
Chicago Manual of Style (16th Edition):
Over, Jonathan David. “Irradiance modeling for solar powered aircraft.” 2012. Masters Thesis, California State University – Northridge. Accessed December 13, 2019.
http://hdl.handle.net/10211.2/1622.
MLA Handbook (7th Edition):
Over, Jonathan David. “Irradiance modeling for solar powered aircraft.” 2012. Web. 13 Dec 2019.
Vancouver:
Over JD. Irradiance modeling for solar powered aircraft. [Internet] [Masters thesis]. California State University – Northridge; 2012. [cited 2019 Dec 13].
Available from: http://hdl.handle.net/10211.2/1622.
Council of Science Editors:
Over JD. Irradiance modeling for solar powered aircraft. [Masters Thesis]. California State University – Northridge; 2012. Available from: http://hdl.handle.net/10211.2/1622
21.
Krishna M.
The structure of labour markets; An inquiry into job search methods occupational mobility
and duration of search.
Degree: 2014, INFLIBNET
URL: http://shodhganga.inflibnet.ac.in/handle/10603/19499
► How labour markets operate in an economic system? has long been a dominant area of newlineresearch in economics, and that has received tremendous scholarly attention…
(more)
▼ How labour markets operate in an economic system?
has long been a dominant area of newlineresearch in economics, and
that has received tremendous scholarly attention from diverse
newlinefields of social sciences. The functioning of the labour
markets, according to conventional newlinewisdom, is primarily
confined to the two fundamental axioms of market: demand and
supply. newlineFrom a pragmatic point of view, these two axioms
represent two principal agents: workers newlineand firms. More
aptly, while the former represents the supply of labour, the latter
represents newlinethe demand for labour. Put it in a slightly
different way, whilst the supply of labour deals newlinewith the
number of people who participate in the labour markets, the demand
for labour newlinerepresents the firms that decide how many workers
to be hired. What is essentially important newlineis that two
agents workers and firms- possess two distinct motives. On the one
hand, when newlinethe workers tend to maximise their well-being,
called utility, firms, on the other hand, attempt newlineto
maximise profit. The conflicting interests between the workers
decision to participate in newlinethe labour markets and the firm s
decision to hire workers are determined by wage rates, newlinewhich
are paid for the productive services rendered by workers. Quite
clearly, with related to newlinethe level of wage earnings, the
demand for and the supply of labour move in opposite
newlinedirection. When the level of wages increases, workers are
more likely to supply their newlineproductive services, but few
firms are willing to hire them, and vice versa. In a competitive or
newlinea free market economy, these conflicting interests
ultimately attain an equilibrium point, a newlinesituation of
market in which the demand for and the supply of labour are equal.
In fact, this newlinesimplistic representation of the operation of
the labour markets can also be interpreted from newlinetwo distinct
angles. newline
Appendices p. 149-154, References p.
155-159.
Advisors/Committee Members: Paul Bino.
Subjects/Keywords: Information; Search; Occupational mobility; Duration of
search
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Manager
APA (6th Edition):
M, K. (2014). The structure of labour markets; An inquiry into job search methods occupational mobility
and duration of search. (Thesis). INFLIBNET. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/19499
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
M, Krishna. “The structure of labour markets; An inquiry into job search methods occupational mobility
and duration of search.” 2014. Thesis, INFLIBNET. Accessed December 13, 2019.
http://shodhganga.inflibnet.ac.in/handle/10603/19499.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
M, Krishna. “The structure of labour markets; An inquiry into job search methods occupational mobility
and duration of search.” 2014. Web. 13 Dec 2019.
Vancouver:
M K. The structure of labour markets; An inquiry into job search methods occupational mobility
and duration of search. [Internet] [Thesis]. INFLIBNET; 2014. [cited 2019 Dec 13].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/19499.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
M K. The structure of labour markets; An inquiry into job search methods occupational mobility
and duration of search. [Thesis]. INFLIBNET; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/19499
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Leiden University
22.
Valk, Denise Maria van der.
Spelgedrag jonge kinderen met ASS en kinderen met taalproblemen: onderzoek naar verschillen in duur, speelgoed en spelniveau.
Degree: 2012, Leiden University
URL: http://hdl.handle.net/1887/20036
► In dit onderzoek waren 22 kinderen met ASS en 26 kinderen met een taalstoornis (gemiddelde leeftijd in maanden: 24,5, SD = 6,66) betrokken. De proefpersonen…
(more)
▼ In dit onderzoek waren 22 kinderen met ASS en 26 kinderen met een taalstoornis (gemiddelde leeftijd in maanden: 24,5, SD = 6,66) betrokken. De proefpersonen namen deel aan het Screening Onderzoek Sociale Ontwikkeling (SOSO) in het UMC in Utrecht. Bij alle kinderen werd daar een screening naar de vroege kenmerken van autisme afgenomen en kinderen met een hoge score werden geïncludeerd (ESAT; Dietz, Swinkels, Van Daalen, Van Engeland & Buitelaar, 2006). Dit onderzoek was gericht op het onderzoeken van mogelijke verschillen in spelgedrag tussen kinderen met ASS en kinderen met een taalstoornis. Spelgedrag werd hiervoor gedefinieerd als de duur van het spelen, het soort speelgoed waarmee gespeeld werd en het spelniveau (manipulatief, relationeel, functioneel en symbolisch spelniveau). Spelobservaties zijn gedaan met een observatieschaal van Baranek et al. (2005). Uit dit onderzoek bleek dat kinderen met autisme meer met de bal en de auto (motorisch stimulerend speelgoed) speelden en kinderen met een taalstoornis meer een voorkeur hadden voor een boek en een puzzel. Uit deze resultaten blijkt dat verschillen al op jonge leeftijd te vinden zijn. Interventie zou dus al vroeg gestart kunnen worden om zo, de uit eerder onderzoeken gevonden achterstanden op spelniveau op latere leeftijd, te kunnen voorkomen.
Advisors/Committee Members: Naber, dr. F.B.A (advisor), Stoutjesdijk, drs. R (advisor).
Subjects/Keywords: play; ASD; SLI; duration; toys; manipulative
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APA (6th Edition):
Valk, D. M. v. d. (2012). Spelgedrag jonge kinderen met ASS en kinderen met taalproblemen: onderzoek naar verschillen in duur, speelgoed en spelniveau. (Masters Thesis). Leiden University. Retrieved from http://hdl.handle.net/1887/20036
Chicago Manual of Style (16th Edition):
Valk, Denise Maria van der. “Spelgedrag jonge kinderen met ASS en kinderen met taalproblemen: onderzoek naar verschillen in duur, speelgoed en spelniveau.” 2012. Masters Thesis, Leiden University. Accessed December 13, 2019.
http://hdl.handle.net/1887/20036.
MLA Handbook (7th Edition):
Valk, Denise Maria van der. “Spelgedrag jonge kinderen met ASS en kinderen met taalproblemen: onderzoek naar verschillen in duur, speelgoed en spelniveau.” 2012. Web. 13 Dec 2019.
Vancouver:
Valk DMvd. Spelgedrag jonge kinderen met ASS en kinderen met taalproblemen: onderzoek naar verschillen in duur, speelgoed en spelniveau. [Internet] [Masters thesis]. Leiden University; 2012. [cited 2019 Dec 13].
Available from: http://hdl.handle.net/1887/20036.
Council of Science Editors:
Valk DMvd. Spelgedrag jonge kinderen met ASS en kinderen met taalproblemen: onderzoek naar verschillen in duur, speelgoed en spelniveau. [Masters Thesis]. Leiden University; 2012. Available from: http://hdl.handle.net/1887/20036
Leiden University
23.
Lunter, Femke.
De relatie tussen slaapduur en inhibitie en de rol van extraversie bij kinderen van 9 tot en met 11 jaar.
Degree: 2014, Leiden University
URL: http://hdl.handle.net/1887/22967
► Sleep deprivation and disturbances are a common problem among children (prevalence of 25-40 percent) and have impact on executive functioning, such as inhibition. Studies in…
(more)
▼ Sleep deprivation and disturbances are a common problem among children (prevalence of 25-40 percent) and have impact on executive functioning, such as inhibition. Studies in adults demonstrated that temperament influences this association. This study examined extraversion as a moderator of the association between sleep
duration and inhibition in 401 school-aged children (183 boys and 218 girls) aged 9 to 12 years old. Children filled out the Early Adolescent Temperament Questionnaire-Revised (EATQ-R) and completed a three minute version of a revised Psychomotor Vigilance Task Go/No-Go. Their parents kept a sleep log for one week. ANCOVA results showed no significant association between average sleep
duration on weekdays and inhibition, neither a significant association between extraversion and inhibition. No significant interaction effect was found for average sleep
duration on weekdays with extraversion on inhibition. To conclude, no relationship between sleep
duration and inhibition was found. Extraversion can’t be seen as a moderator for the association between sleep
duration and inhibition. In order to enhance the knowledge concerning sleep deprivation, future research should focus on the association between sleep deprivation or sleep difficulties and executive functioning, as well as temperamental traits moderating this relation.
Advisors/Committee Members: van der Heijden, dr. K.B (advisor).
Subjects/Keywords: children; sleep duration; temperament; extraversion; inhibition
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APA (6th Edition):
Lunter, F. (2014). De relatie tussen slaapduur en inhibitie en de rol van extraversie bij kinderen van 9 tot en met 11 jaar. (Masters Thesis). Leiden University. Retrieved from http://hdl.handle.net/1887/22967
Chicago Manual of Style (16th Edition):
Lunter, Femke. “De relatie tussen slaapduur en inhibitie en de rol van extraversie bij kinderen van 9 tot en met 11 jaar.” 2014. Masters Thesis, Leiden University. Accessed December 13, 2019.
http://hdl.handle.net/1887/22967.
MLA Handbook (7th Edition):
Lunter, Femke. “De relatie tussen slaapduur en inhibitie en de rol van extraversie bij kinderen van 9 tot en met 11 jaar.” 2014. Web. 13 Dec 2019.
Vancouver:
Lunter F. De relatie tussen slaapduur en inhibitie en de rol van extraversie bij kinderen van 9 tot en met 11 jaar. [Internet] [Masters thesis]. Leiden University; 2014. [cited 2019 Dec 13].
Available from: http://hdl.handle.net/1887/22967.
Council of Science Editors:
Lunter F. De relatie tussen slaapduur en inhibitie en de rol van extraversie bij kinderen van 9 tot en met 11 jaar. [Masters Thesis]. Leiden University; 2014. Available from: http://hdl.handle.net/1887/22967
Leiden University
24.
Weber, Nina.
De rol van slaapduur in de relatie tussen slaapproblemen en het gedrag van kinderen.
Degree: 2015, Leiden University
URL: http://hdl.handle.net/1887/34865
► Sleep problems in children are common and can affect their health. This study examined whether sleep duration mediates the association between sleep problems and behavioral…
(more)
▼ Sleep problems in children are common and can affect their health. This study examined whether sleep
duration mediates the association between sleep problems and behavioral problems in children from nine to eleven years. The study consisted of a research among a group of 482 children, 220 boys and 260 girls (two unknown). The mean age of the children was 10.5 years (SD = 0.83). Their parents were asked to fill out the Sleep Disturbance Scale for Children (SDSC) and the Strengths and Difficulties Questionnaire (SDQ), which were used to measure sleep disturbances and internalizing and externalizing behavioral problems of the children respectively. In addition, parents kept an online sleep diary for a week to collect information about the sleep
duration of the child. Regression analyses showed a significant association between sleep problems and both internalizing (β = .24) and externalizing behavioral problems (β = .26), as well as a significant negative association between sleep problems and sleep
duration (β = -.21). Sleep
duration and - both internalizing and externalizing - behavioral problems were not significantly related. The results therefore suggest that sleep
duration did not mediate the association between sleep problems and behavioral problems. The overall findings highlight the importance that parents should be aware of sleep problems underlying the behavioral problems of their child. Besides, sleep problems may serve as a warning for a higher risk of developing behavior problems. The findings of this study may be useful in interventions to treat, control or prevent sleep and behavioral problems. It should however be noted that other factors could influence the association between sleep problems and behavioral problems and more research is needed to further explore this association.
Advisors/Committee Members: Vermeulen, M.C.M (advisor), Heijden, K. B. van der (advisor).
Subjects/Keywords: sleep problems; sleep duration; behavioral problems
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APA (6th Edition):
Weber, N. (2015). De rol van slaapduur in de relatie tussen slaapproblemen en het gedrag van kinderen. (Masters Thesis). Leiden University. Retrieved from http://hdl.handle.net/1887/34865
Chicago Manual of Style (16th Edition):
Weber, Nina. “De rol van slaapduur in de relatie tussen slaapproblemen en het gedrag van kinderen.” 2015. Masters Thesis, Leiden University. Accessed December 13, 2019.
http://hdl.handle.net/1887/34865.
MLA Handbook (7th Edition):
Weber, Nina. “De rol van slaapduur in de relatie tussen slaapproblemen en het gedrag van kinderen.” 2015. Web. 13 Dec 2019.
Vancouver:
Weber N. De rol van slaapduur in de relatie tussen slaapproblemen en het gedrag van kinderen. [Internet] [Masters thesis]. Leiden University; 2015. [cited 2019 Dec 13].
Available from: http://hdl.handle.net/1887/34865.
Council of Science Editors:
Weber N. De rol van slaapduur in de relatie tussen slaapproblemen en het gedrag van kinderen. [Masters Thesis]. Leiden University; 2015. Available from: http://hdl.handle.net/1887/34865
University of Edinburgh
25.
Wallmén, Ebba.
The Enhancing Cognitive Effects of Musicianship and Bilingualism: Differences Within and Across Bimodal Tasks of Attention and Time Perception.
Degree: 2011, University of Edinburgh
URL: http://hdl.handle.net/1842/6139
► Abstract Background: Previous studies have shown cognitive enhancement effects of well-practiced experiences that involve executive cognition, such as musical and language abilities (e.g. Bialystok and…
(more)
▼ Abstract
Background: Previous studies have shown cognitive enhancement effects of well-practiced experiences that involve executive cognition, such as musical and language abilities (e.g. Bialystok and DePape, 2009).
Aims: The present study aims to investigate whether there is a difference in the enhancement of executive processing between monolingual-musicians and bilinguals, and what the effects may be for people with intensive musical experience as well as linguistic experience, and confidence in two or more languages. A battery of attentional and temporal attentional tasks, as well as
duration discrimination and temporal comparison tasks were administered.
Methods: There were a total of 73 participants taking part in the study, based on their music and language abilities the participants were divided into four groups: Bilinguals, Monolingual-Musicians, Bilingual-Musicians and one control group consisting of monolingual non-musicians. The groups were compared on four different executive functioning tasks, all involving sustained and selective attention, response suppression and
duration estimation, looking at performance for both auditory and visual stimuli.
Results: The results suggest a positive effect of musicianship across all tasks, except the last temporal comparison tasks. Bilinguals performed comparatively poorly, and there was a suggestive effect of bilingualism being at a disadvantage for the tasks involved in the study, as the Bilingual-Musicians did not show any potential enhancement effect of performance based on language experience, whereas musicianship had a clear additive effect on pitch discrimination.
Conclusion: Even though musicians were found to perform better on all tasks, this does not necessarily suggest modularity-specificity, but could be generalized enhanced cognitive phenomena originating from original cognitive differences, e.g. a better working memory, that does not relate to musicianship per se. The results also suggest that bilinguals might have low response inhibitory control, as opposed to conceptual control, which could relate to misperception of time.
Advisors/Committee Members: Bak, Thomas.
Subjects/Keywords: Bilingual; Musical ability; cognitive enhancement; duration discrimination
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APA (6th Edition):
Wallmén, E. (2011). The Enhancing Cognitive Effects of Musicianship and Bilingualism: Differences Within and Across Bimodal Tasks of Attention and Time Perception. (Thesis). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/6139
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wallmén, Ebba. “The Enhancing Cognitive Effects of Musicianship and Bilingualism: Differences Within and Across Bimodal Tasks of Attention and Time Perception.” 2011. Thesis, University of Edinburgh. Accessed December 13, 2019.
http://hdl.handle.net/1842/6139.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wallmén, Ebba. “The Enhancing Cognitive Effects of Musicianship and Bilingualism: Differences Within and Across Bimodal Tasks of Attention and Time Perception.” 2011. Web. 13 Dec 2019.
Vancouver:
Wallmén E. The Enhancing Cognitive Effects of Musicianship and Bilingualism: Differences Within and Across Bimodal Tasks of Attention and Time Perception. [Internet] [Thesis]. University of Edinburgh; 2011. [cited 2019 Dec 13].
Available from: http://hdl.handle.net/1842/6139.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wallmén E. The Enhancing Cognitive Effects of Musicianship and Bilingualism: Differences Within and Across Bimodal Tasks of Attention and Time Perception. [Thesis]. University of Edinburgh; 2011. Available from: http://hdl.handle.net/1842/6139
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Kansas
26.
Crist, Rachel.
Terror Attacks and the Duration of Civil War.
Degree: MA, Global and International Studies, Center for, 2015, University of Kansas
URL: http://hdl.handle.net/1808/19026
► Several factors that scholars have thought relate to the duration of civil war including: low per capita income, ethnic divisions, resources/contraband, and terrain were found…
(more)
▼ Several factors that scholars have thought relate to the
duration of civil war including: low per capita income, ethnic divisions, resources/contraband, and terrain were found to have no correlation to the
duration of civil war. Another factor that scholars have suggested relates to the
duration of civil war is rebel group strength. It has been found that a rebel group with weak military capacity may prolong a civil war. Weak rebel groups use irregular tactics and an irregular tactic that a weak rebel group may use is terrorist attacks. The contribution of this thesis is that it analyzes a variable that few scholars have looked at which is tactics, specifically terrorist attacks, to see whether or not terrorist attacks are related to the
duration of civil war. The findings suggest that the number of terror attacks relates to the
duration of civil war. A high number of terrorist attacks is a sufficient condition, but not a necessary condition for a prolonged civil war.
Advisors/Committee Members: Kennedy, John (advisor), Wuthrich, Michael (cmtemember), Joslyn, Mark (cmtemember).
Subjects/Keywords: Political Science; Civil; Duration; Terror; Terrorist; War
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APA (6th Edition):
Crist, R. (2015). Terror Attacks and the Duration of Civil War. (Masters Thesis). University of Kansas. Retrieved from http://hdl.handle.net/1808/19026
Chicago Manual of Style (16th Edition):
Crist, Rachel. “Terror Attacks and the Duration of Civil War.” 2015. Masters Thesis, University of Kansas. Accessed December 13, 2019.
http://hdl.handle.net/1808/19026.
MLA Handbook (7th Edition):
Crist, Rachel. “Terror Attacks and the Duration of Civil War.” 2015. Web. 13 Dec 2019.
Vancouver:
Crist R. Terror Attacks and the Duration of Civil War. [Internet] [Masters thesis]. University of Kansas; 2015. [cited 2019 Dec 13].
Available from: http://hdl.handle.net/1808/19026.
Council of Science Editors:
Crist R. Terror Attacks and the Duration of Civil War. [Masters Thesis]. University of Kansas; 2015. Available from: http://hdl.handle.net/1808/19026
The Ohio State University
27.
Parsons, Mitchell William.
Prediction of Transient Cooling Behavior in Short-Duration
Facilities.
Degree: MS, Mechanical Engineering, 2011, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1312379529
► For many years designers have been pushing turbine inlet temperatures to higher and higher levels in order to create more efficient gas turbine engines.…
(more)
▼ For many years designers have been pushing
turbine inlet temperatures to higher and higher levels in order to
create more efficient gas turbine engines. To keep hot section
components from melting, advancements in turbine materials and
cooling schemes are being explored. One area of research has been
focused on the internal passages for cooled turbine vanes and
blades. The Ohio State University Gas Turbine Laboratory (OSU GTL)
is currently conducting an experimental program to investigate the
heat transfer characteristics for internal coolant passages using a
multiple passage serpentine channel
configuration. The internal heat transfer
experimental configuration requires cooling gas at a specific
temperature. Traditionally at OSU GTL, coolant gas is supplied from
a supply tank operating in a blowdown mode. It has proven difficult
to maintain the cooling gas at the desired temperature due to the
heating effect of the supply tubing and internal passages.
This thesis develops a model that utilizes a
simplified form of the non-dimensional heat exchanger equations to
predict fluid temperatures for cooling supply components operating
over a wide range of conditions and geometries. Heat exchangers are
typically designed with long non-dimensional lengths and short
non-dimensional times. However, short non-dimensional lengths and
long non-dimensional times are characteristics of cooling system
components. Even though the two types of components have
drastically different physical geometries and non-dimensional
quantities, the simplified non-dimensional equations can be used to
model both components. By providing an analytical understanding of
the problem as well as a numerical design code, various components
undergoing transient heat transfer can be modeled and unique
designs can be evaluated. The application of the numerical code
reaches beyond the internal heat transfer program and can be
applied to a variety of different heat transfer projects at the OSU
GTL.
Advisors/Committee Members: Dunn, Michael (Advisor).
Subjects/Keywords: Mechanical Engineering; cooling; transient; short-duration
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APA (6th Edition):
Parsons, M. W. (2011). Prediction of Transient Cooling Behavior in Short-Duration
Facilities. (Masters Thesis). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1312379529
Chicago Manual of Style (16th Edition):
Parsons, Mitchell William. “Prediction of Transient Cooling Behavior in Short-Duration
Facilities.” 2011. Masters Thesis, The Ohio State University. Accessed December 13, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1312379529.
MLA Handbook (7th Edition):
Parsons, Mitchell William. “Prediction of Transient Cooling Behavior in Short-Duration
Facilities.” 2011. Web. 13 Dec 2019.
Vancouver:
Parsons MW. Prediction of Transient Cooling Behavior in Short-Duration
Facilities. [Internet] [Masters thesis]. The Ohio State University; 2011. [cited 2019 Dec 13].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1312379529.
Council of Science Editors:
Parsons MW. Prediction of Transient Cooling Behavior in Short-Duration
Facilities. [Masters Thesis]. The Ohio State University; 2011. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1312379529
Universiteit Utrecht
28.
Dohmen, W.
Duration of colonization with extended-spectrum β-lactamase-producing Enterobacteriaceae.
Degree: 2014, Universiteit Utrecht
URL: http://dspace.library.uu.nl:8080/handle/1874/294832
► Extended Spectrum Beta-Lactamase-producing Enterobacteriaceae (ESBL-PE) are an emerging concern in public health. Antimicrobial use, hospitalization and foreign travel are associated with human carriage of ESBL-PE.…
(more)
▼ Extended Spectrum Beta-Lactamase-producing Enterobacteriaceae (ESBL-PE) are an emerging concern in public health. Antimicrobial use, hospitalization and foreign travel are associated with human carriage of ESBL-PE.
Duration of carriage with ESBL-PE can vary. The main objective of this thesis is to provide an overview of the current scientific knowledge on persistence of ESBL carriage in humans. In addition, risk factors for
duration of ESBL carriage will be described. After a literature search, 14 studies met the criterion that
duration of ESBL-PE was assessed. Eight studies were conducted in patients, two in NICU patients, and four in non-patients (travelers, adopted children, medical students). Approximately half of adult (hospitalized) patients carried ESBL-PE after 6 months (range 33-53%). After 12 months, this percentage was around 25%. Median carriage time was reported from 98 days till more than 9 months. For a minority of patients carriage time was more than three years. Prolonged carriage with ESBL-PE was associated with outpatient oral use of antibiotics, urine catheters, chronic wounds, immobility and percutaneous gastrostomy, E. coli phylogroup B2, and CTX-M group 9. In NICU patients, median carriage time was 12.5 months, but carriage persisted after 12 months for 5% of individuals. Prolonged
duration was observed for K. pneumonia or K. oxytoca species compared to S. marcensens, antibiotic treatment and caesarian section. Of travelers, 24% carried ESBL-producing E. coli after 3-8 months. Mean carriage time for 22 adopted children from Mali was 9 months. Out of 41 Chinese medical students, 68% remained colonized for 4 months. Results vary greatly and are hard to compare or generalize for many reasons such as small sample size, different definitions for
duration, persistence and clearance, absence of molecular information, selection bias, and global differences. A longer
duration of carriage with ESBL-PE might influence the risk of carriage with ESBL-PE for the patient itself and transmission to household members and the general population. Routine screening and/or contact restriction is suggested for previously ESBL-PE positive patients. Perhaps focus should be more on prevention of transmission than on clearance, because clearance is hard to accomplish. To estimate
duration of carriage with ESBL-PE in the general population, large studies are needed.
Advisors/Committee Members: Heederik, D..
Subjects/Keywords: Extended-Spectrum Beta-Lactamases; Duration; Colonization
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APA ·
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MLA ·
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Export
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Manager
APA (6th Edition):
Dohmen, W. (2014). Duration of colonization with extended-spectrum β-lactamase-producing Enterobacteriaceae. (Masters Thesis). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/294832
Chicago Manual of Style (16th Edition):
Dohmen, W. “Duration of colonization with extended-spectrum β-lactamase-producing Enterobacteriaceae.” 2014. Masters Thesis, Universiteit Utrecht. Accessed December 13, 2019.
http://dspace.library.uu.nl:8080/handle/1874/294832.
MLA Handbook (7th Edition):
Dohmen, W. “Duration of colonization with extended-spectrum β-lactamase-producing Enterobacteriaceae.” 2014. Web. 13 Dec 2019.
Vancouver:
Dohmen W. Duration of colonization with extended-spectrum β-lactamase-producing Enterobacteriaceae. [Internet] [Masters thesis]. Universiteit Utrecht; 2014. [cited 2019 Dec 13].
Available from: http://dspace.library.uu.nl:8080/handle/1874/294832.
Council of Science Editors:
Dohmen W. Duration of colonization with extended-spectrum β-lactamase-producing Enterobacteriaceae. [Masters Thesis]. Universiteit Utrecht; 2014. Available from: http://dspace.library.uu.nl:8080/handle/1874/294832
Georgia State University
29.
Schilling, Katharine A.
Characteristics and Etiology of Moderate-to-Severe Diarrhea of Acute, Prolonged Acute, and Persistent Duration among Children Less than 5 Years Old in Rural Western Kenya, 2008-2010.
Degree: MPH, Public Health, 2010, Georgia State University
URL: https://scholarworks.gsu.edu/iph_theses/146
► Worldwide, diarrheal disease is the second leading cause of death in children under 5 years old. Data on diarrhea of extended duration is limited.…
(more)
▼ Worldwide, diarrheal disease is the second leading cause of death in children under 5 years old. Data on diarrhea of extended
duration is limited. We described the characteristics associated with acute, prolonged acute and persistent diarrhea in Kenyan children less than 5 years of age participating in the Global Enterics Multicenter Study. Children presenting at a clinic were enrolled if they met the case definition for acute moderate-to-severe diarrhea defined as >3 loose stools in the last 24 hrs, within 7 days of illness onset, with >1 of the following: sunken eyes, skin tenting, dysentery, IV rehydration, or hospitalization. To determine diarrhea
duration, the child’s caretaker was asked to recall the number of days the child had diarrhea in the 7 days pre-enrollment, and to record each day of diarrhea post-enrollment on a form for 14 days. Stool specimens were collected at enrollment, and the post-enrollment form was collected during a home visit. We defined acute diarrhea (AD) as <6 days>
duration, prolonged acute diarrhea (ProD) as 7-13 days, and persistent diarrhea (PD) as >14 days. From January 31, 2008 to January 24, 2010, 557 children with acute moderate-to-severe diarrhea were enrolled. Using the Wilcoxon rank-sum test, Kruskal-Wallis test, and Cox Proportional Hazards Model we examined the relationship between the
duration of diarrhea by gender, age, and various etiologic agents. We found no association between gender and the
duration of diarrhea. Age was associated with diarrhea of extended
duration; children less than or equal to 11 months of age were 1.3 times more likely to experience diarrhea of longer
duration than their counterparts. We found Cryptosporidium to be more associated with ProAD and PD. Children infected with Cryptosporidium were 1.5 to 1.7 times more likely to have diarrhea with a longer
duration than their counterparts. Based on these results, interventions related to diarrhea and diarrhea of extended
duration should focus more closely on young children, especially children less than 24 months of age.
Advisors/Committee Members: Dr. Richard Rothenberg, MD, MPH, FACP, Dr. Eric Mintz, MD, MPH.
Subjects/Keywords: Diarrhea; Duration; Kenya; Children; Etiology; Public Health
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APA (6th Edition):
Schilling, K. A. (2010). Characteristics and Etiology of Moderate-to-Severe Diarrhea of Acute, Prolonged Acute, and Persistent Duration among Children Less than 5 Years Old in Rural Western Kenya, 2008-2010. (Thesis). Georgia State University. Retrieved from https://scholarworks.gsu.edu/iph_theses/146
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Schilling, Katharine A. “Characteristics and Etiology of Moderate-to-Severe Diarrhea of Acute, Prolonged Acute, and Persistent Duration among Children Less than 5 Years Old in Rural Western Kenya, 2008-2010.” 2010. Thesis, Georgia State University. Accessed December 13, 2019.
https://scholarworks.gsu.edu/iph_theses/146.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Schilling, Katharine A. “Characteristics and Etiology of Moderate-to-Severe Diarrhea of Acute, Prolonged Acute, and Persistent Duration among Children Less than 5 Years Old in Rural Western Kenya, 2008-2010.” 2010. Web. 13 Dec 2019.
Vancouver:
Schilling KA. Characteristics and Etiology of Moderate-to-Severe Diarrhea of Acute, Prolonged Acute, and Persistent Duration among Children Less than 5 Years Old in Rural Western Kenya, 2008-2010. [Internet] [Thesis]. Georgia State University; 2010. [cited 2019 Dec 13].
Available from: https://scholarworks.gsu.edu/iph_theses/146.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Schilling KA. Characteristics and Etiology of Moderate-to-Severe Diarrhea of Acute, Prolonged Acute, and Persistent Duration among Children Less than 5 Years Old in Rural Western Kenya, 2008-2010. [Thesis]. Georgia State University; 2010. Available from: https://scholarworks.gsu.edu/iph_theses/146
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of California – San Diego
30.
Full, Kelsie Marie.
24-Hours of Heart Health: An Analysis of Sleep Duration and Cardiovascular Disease in the OPACH Cohort.
Degree: PubHlth (Health Behav)JtDocSDSU, 2018, University of California – San Diego
URL: http://www.escholarship.org/uc/item/08502900
► Background: Cardiovascular Disease (CVD) is the most prevalent chronic disease in the aging population. Older women are at greatest risk for CVD, higher than their…
(more)
▼ Background: Cardiovascular Disease (CVD) is the most prevalent chronic disease in the aging population. Older women are at greatest risk for CVD, higher than their male counterparts. Disparities in the incidence and prevalence of CVD and CVD risk factors in older women, suggest that current prevention strategies are not effective for these populations. Research shows that post-menopausal women experience difficulty adapting to age-related changes in sleep. Considering 1/3 of the day is spent sleeping, sleep duration is a potential modifiable CVD lifestyle risk factor worthy of greater exploration. Aging research to date has included a focus on the cardiometabolic associations of sleep duration, including large-scale epidemiological studies and meta-analyses concluding that inadequate sleep duration and poor sleep quality are associated with increased development, progression, and severity of CVD and CVD comorbidities. Research, however, has mostly employed self-reported sleep measures, focused on Caucasian populations and has not considered sleep as part of the 24 hour day. There is a need for research to examine the relationship between sleep duration and CVD risk in an older population of women, and to determine if insufficient sleep duration, short or long, is a CVD risk factor worthy of further examination. Methods: This dissertation leverages data from the unique “Objective Physical Activity and Cardiovascular Health” (OPACH) study among 6489 women, ages 63-99, recruited from a Women’s Health Initiative cohort. Women wore ActiGraph GT3X+ accelerometers on the hip for 24 hours per day and completed a daily sleep log over a 7-day period. In addition to accelerometer-measured 24-hour activity data, the OPACH study includes measures of physical functioning, lifestyle questionnaires, and clinical biomarkers. Participants were contacted yearly to provide updated medical history including self-report of CVD events with follow-up up to 5 years. Sleep data were scored according to a standard protocol using sleep logs. Chapter 1 assessed if sleep duration, measured with accelerometers, is associated with numerous cardiometabolic markers, including measures of insulin resistance, inflammation and body composition in older women. Chapter 2 was an examination of the relationship between sleep duration and the Reynolds Risk Score, a clinically relevant composite CVD risk score. In Chapter 3, the relationship between cardiovascular events over 3-5 years of follow-up and self-reported sleep duration and accelerometer-measured sleep duration was examined. Results: Chapter 1 found significant associations between sleep duration and markers of cardiometabolic health. Several of these relationships suggested the relationship was u-shaped, with short and long sleep associated with higher cardiometabolic values. Chapter 2 further explored this relationship and demonstrated that sleep duration is non-linearly associated with 10-year estimated CVD risk among older women. In Chapter 3, there was no significant increase in CVD risk for…
Subjects/Keywords: Public health; Aging; Cardiovascular Disease; Sleep Duration
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APA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Full, K. M. (2018). 24-Hours of Heart Health: An Analysis of Sleep Duration and Cardiovascular Disease in the OPACH Cohort. (Thesis). University of California – San Diego. Retrieved from http://www.escholarship.org/uc/item/08502900
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Full, Kelsie Marie. “24-Hours of Heart Health: An Analysis of Sleep Duration and Cardiovascular Disease in the OPACH Cohort.” 2018. Thesis, University of California – San Diego. Accessed December 13, 2019.
http://www.escholarship.org/uc/item/08502900.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Full, Kelsie Marie. “24-Hours of Heart Health: An Analysis of Sleep Duration and Cardiovascular Disease in the OPACH Cohort.” 2018. Web. 13 Dec 2019.
Vancouver:
Full KM. 24-Hours of Heart Health: An Analysis of Sleep Duration and Cardiovascular Disease in the OPACH Cohort. [Internet] [Thesis]. University of California – San Diego; 2018. [cited 2019 Dec 13].
Available from: http://www.escholarship.org/uc/item/08502900.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Full KM. 24-Hours of Heart Health: An Analysis of Sleep Duration and Cardiovascular Disease in the OPACH Cohort. [Thesis]. University of California – San Diego; 2018. Available from: http://www.escholarship.org/uc/item/08502900
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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Open Access Theses and Dissertations