One of the primary missions of the National Weather Service (NWS) is to use a network of more than 150 NEXRAD radar installations to monitor weather for threats to life and property. Large hail produced by severe thunderstorms is a major focus of this mission. An algorithm known as the Maximum Estimated Size of Hail (MESH) algorithm is in operational use to diagnose the presence and size of hail. This study aims to use dual-Doppler observations as well as the MESH algorithm to test the idea that storms that rotate produce larger hail. Previous studies have used polarimetric radar products to detect the presence of large hail and dual-Doppler methods have been used to study embryonic hail, but no research has tested the theory of hail and rotating storms with observational evidence. A set of 59 case studies was gathered; each included a hail report submitted by a trained weather spotter or NWS employee and complete radar observations through the depth of a storm from two radars. The radar observations were resampled to a three-dimensional Cartesian grid and a dual-Doppler analysis was run on each case study. A strong correlation (stronger even than the MESH algorithm) was found between measured vorticity and hail size, lending credence to the idea that rotating storms do indeed have a higher ceiling for hail production. However, no correlation was found between MESH error and rotation. Further research will be required to evaluate whether or not this relationship can be used to augment the MESH algorithm so as to improve its skill. / Master of Science / The National Weather Service (NWS) uses a nationwide network of long-range weather radars to monitor the atmosphere over the United States. One of the primary applications of that network is to protect life and property by identifying and monitoring storms capable of producing large hail. The probable size of hail is estimated using an algorithm on raw radar data. This study uses multi-radar analysis methods to establish a metric for storm rotation, which is used in conjunction with the operational hail size algorithm to test the theory that rotating storms produce larger hail. A set of 59 case studies, each composed of data from a pair of radars as well as a measured hail size from a storm spotter, was gathered and analyzed. Analysis resulted in three values per case study: actual hail size, predicted hail size, and storm rotation intensity. Storm rotation and actual hail size were found to be strongly correlated, lending credence to the idea that rotation increases a storm’s hail production ceiling. However, no strong correlation was found between the operational algorithm’s error and storm rotation. Additional research will be required to determine if the relationship between rotation and actual hail size can be used to improve the skill of current operational algorithms.

In part ONE of this thesis, including the most up to date information on SARS virology, disease transmission, pathogenesis and laboratory diagnosis will be summarized and presented, including the results of many studies in which I have participated (these references will be underlined as they appear in text). This of course summarizes knowledge that is now known in 2006 but was largely unknown during the initial outbreak. In part TWO, six original clinical studies performed at PWH will be presented: study (1) describes the clinical manifestations and severity of SARS, and its potential to cause major hospital outbreaks; (2) demonstrates the importance of epidemiological linkage in diagnosing SARS; (3) reports the clinical outcomes of a stepwise treatment protocol, which includes the use of corticosteroid therapy as an immunomodulant; (4) demonstrates that corticosteroid therapy can retard viral clearance, and should be used judiciously; (5) demonstrates that a more robust humoral response is associated with severe SARS, thus indicating that passive immunity treatment strategies seem only suitable either during early illness or as prophylaxis; and (6) shows that SARS has few early discriminating laboratory features compared to other causes of community-acquired pneumonia, thus a high index of suspicion is needed to recognize this infection in the absence of worldwide transmission. A thorough review of the relevant published material will be included in the discussion section of each study. / Severe Acute Respiratory Syndrome (SARS) is an emerging infectious disease caused by a novel coronavirus. It caused a global outbreak in 2003, resulting in more than 8000 infections, 700 deaths, and major social and economic disruption. In the initial phase of the SARS outbreak, the medical profession had no knowledge regarding the responsible pathogen, nor the clinical manifestations of SARS and the course of illness. There was no reliable diagnostic tool and no known effective therapy. But for the first time in medical history, we witnessed the rapid accumulation of knowledge on a disease as it evolved, which in turn assisted its management and control. / Since conducting randomized-controlled trials during the 2003 crisis was almost impossible, most of the presented studies are either descriptive or case-controlled in design. However, these studies have laid foundations for recent and future research into the clinical diagnosis and management of SARS. Moreover, the construction of the SARS clinical database has contributed to the work of other investigators, which has resulted in over thirty-six publications. It is my hope that these research endeavors can contribute to the understanding of this emerging, deadly disease. / Lee Lai Shun, Nelson. / "April 2006." / Source: Dissertation Abstracts International, Volume: 69-01, Section: B, page: 0205. / Thesis (M.D.)--Chinese University of Hong Kong, 2007. / Includes bibliographical references (p. 264-292). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstracts in English and Chinese. / School code: 1307.

abstract: Severe weather affects many regions of the United States, and has potential to greatly impact many facets of society. This study provides a climatological spatial analysis by county of severe weather warnings issued by the National Weather Service (NWS) between January 1st, 1986 to December 31st, 2017 for the contiguous United States. The severe weather warnings were issued for county-based flash flood, severe thunderstorm, and tornado phenomena issued through the study period and region. Post 2002 severe weather warnings issued by storm warning area were included in this study in the form of county-based warnings simultaneously issued for each affected county. Past studies have researched severe weather warnings issued by the NWS, however these studies are limited in geographic representation, study period, and focused on population bias. A spatial analysis of severe weather warning occurrences by county identify that (a) highest occurrences of flash flood warnings are located in the desert Southwest and Texas, (b) severe thunderstorm warning occurrence is more frequent in Arizona, portions of the Midwest, the South, and the Mid and South Atlantic states, (c) the tornado activity regions of Tornado Alley and Dixie Alley (i.e. Colorado, Kansas, Oklahoma, Arkansas, Texas, Louisiana, Mississippi, Alabama, Tennessee, and Illinois) contained the highest occurrences of tornado warnings, and (d) the highest instances of aggregate warning occurrences are found in the desert Southwest, the Midwest, and the Southern regions of the United States. Generally, severe weather warning “hot spots” tend to be located in those same regions, with greater coverage. This study concludes with a comparison of local maxima and general hot spot regions to expected regions for each phenomenon. Implications of this study are far reaching, including emergency management, and has potential to reduce risk of life. / Dissertation/Thesis / Masters Thesis Geography 2019

Engagement is the active involvement in experiences which allows for development. For children with severe mobility impairments however, challenges arise in accessing experience which can lead to learned helplessness. Due to these challenges powered mobility has been suggested as a mechanism for the provision of self-initiated access to experiences. However, powered mobility is out of reach of the majority of children with disabilities in South Africa hence a non-powered alternative has been sought. This study sought to determine the effect of non-powered, self-initiated mobility on the engagement of young children, with severe mobility impairment, in play. A multiple probe design across participants was used. Four participants, aged 2 years 10 months to 6 years 9 months with severe mobility impairment (Gross Motor Function Classification Scale (GMFCS) level V) underwent a minimum of 5 baseline sessions, followed by 8 intervention sessions. Engagement was measured during each session using the Individual Child Engagement Record –Revised (ICER-R). The data was analysed using visual graphic and statistical analysis. All participants demonstrated an improvement in engagement in play with the introduction of non-powered, self-initiated mobility. A reciprocal deterioration in non-engagement was also recorded. A decrease in engagement in play at the start of intervention was attributed to the focus of engagement being on mobility skills as the device was introduced but this reverted as the participants spent more time on the mobility device. Functional abilities were identified as having a greater role in engagement than age. The introduction of non-powered, self-initiated mobility correlated with the improvement of engagement of young children with severe motor impairment. Non-powered, self-initiated mobility is a viable, cost effective mechanism for mobility at a young age. / Thesis (PhD)--University of Pretoria, 2015. / Centre for Augmentative and Alternative Communication (CAAC) / PhD / Unrestricted

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In light of the increasing number of mentally ill inmates in the criminal justice system, felony mental health courts aim to de-criminalize these individuals and link them to appropriate types of treatment within the community. Few studies have investigated the successful linkage of community-based treatment among felony mental health court participants. More specifically, there is an absence of research on the efficacy of pharmacotherapy on recidivism status among felony mental health court defendants. This retrospective study used archival data to determine if receiving pharmacotherapy will increase duration of time between arrests and keep felony mental health court participants out of the criminal justice system longer. The study also aimed to investigate if psychotropic medication use helped to reduce the risk of violent arrests among those participating in the felony mental health program. Lastly, it evaluated whether drugs from specific classes had more of an effect on recidivism status than others. Cox regression analyses, with propensity score adjustments, were used to determine if psychotropic medication keeps felony mental health court participants out of the criminal justice system longer. Cox regression analysis was also used to determine if specific drugs from different classes had more of an effect on time to re-arrest than others. Lastly, a binary logistic regression, with propensity score adjustments, was used to determine if psychotropic medication helped to reduce the risk of future violent offenses after entry into the FMHC program. All analyses included covariates to control for any potentially confounding factors to the outcome. The study yielded non-significant results when testing whether or not the use of psychotropic medication had an impact on the time to re-arrest, and on risks of future violent offenses.

The purpose of this study is to investigate six teachers' experience in the use of tablets in teaching for students with severe intellectual disability. With this purpose the following questions were asked; in which teaching situations do teachers for students with severe intellectual disability use tablets, for what purposes do teachers state that the tablet is used in teaching students with severe intellectual disability and what are the advantages and disadvantages for students with severe intellectual disability with using the tablet in education? To find this out the method of qualitative interviews was applied. The thesis is based on the research area "curriculum theory", here translated "theory of teaching". The study is based on Dillons model of what constructs a curriculum/teaching situations. Six teachers working with students with severe intellectual disability were interviewed. All the teachers had the experience of using the tablet in education. All the teachers felt that the tablet was a very motivating and multifunctional tool for teaching. It concluded that the tablet was used both as a tool for communication and an alternative/complement to the more traditional teaching materials that already exist within the foundation for students with severe intellectual disability.

In New Zealand, approximately 10% of births are considered premature, that is less than 37 weeks gestation. With advances in medical technology, young infants are surviving gestation periods as few as 23 weeks. It is expected that many of these severely premature infants will demonstrate some problem in their academic, or cognitive function including language functioning. It is agreed that children who are born severely premature often present with language problems, the nature of the difficulties are not clear. Research examining language abilities that involve cognitive functions such as inference generation have demonstrated that children born prematurely exhibit difficulties with phonologic short-term memory and executive function. Language tasks such as inference understanding require children to integrate real-world knowledge with the linguistic information to generate and produce language that is more complex. The aim of this study was to discover if the language of children born severely premature differs from that of language-age matched peers. This study examined high-level language abilities of school-age children born severely prematurely, specifically, language tasks that involved executive functions including working memory, story inferencing, and recognising absurdities. Six children who were born less than 28 weeks gestation participated in this study. Their results on the above measures were compared to a language-aged matched comparison group, determined by performance on a standardised test. It was hypothesised that the children born severely premature would not differ from their language-age matched peers on measures of general language ability but differences would exist on measures of language processing and inferencing. The findings overall showed little difference between the preterm group and their language-age matched peers on measures except for the measure of chronological age. Although no group difference was found for the measure of working memory, a larger variance on this measure was observed in the preterm group.

Scanning strategies for research and operational applications were developed for meteorological measurements with an experimental PAR, the MWR-05XP. A tornadic storm sampling strategy was developed with a 502.26 ms volumetric update and a resolution of 1.8 Az x 2 El x 150 m range. A sampling strategy for severe thunderstorm clusters was developed with a 10 second volumetric update and a resolution of 1.8 Az x 2 El x 300 m range. An operational weather scanning strategy was developed with an 81 second volumetric update and a resolution of 1.8 Az x 2 El x 150 m range. In general, for the acquisition of weather data, single frequency phased array radars offer only a slight sampling advantage over conventional scanning radars. This research verified that for meteorological sampling with the MWR-05XP, frequency diversity, coupled with electronic elevation scanning, offers a significant sampling advantage over conventional radars. The combination of electronic beam steering and frequency diversity produces a synergistic reduction in sampling time that increases the overall volumetric update rate. This research has also shown that, based on assumptions about the MWR-05XP operating parameters, it is possible to incorporate operational weather scanning into the radar's multifunction capability.

Magister Artium (Psychology) - MA(Psych) / Over time, the ‘normal’ experience of pregnancy transitioned to the hospital setting, leading to a discourse steeped in the notions of risks and complications. Risks and complications refer to health problems expectant women may experience, causing them to have a high-risk pregnancy. High-risk pregnancy refers to a pregnancy that negatively affects the health of the mother, the baby, or both, and evoking a range of emotional and psychological experiences. Research on high-risk pregnancy is predominantly found in the medical arena. Such research usually concerns the disease, while women’s emotional/psychological experiences are not sufficiently documented. For this reason, the objectives of this study was to explore the emotional and psychological experiences of women in the reviewed articles throughout their high-risk pregnancies, and identify the medical conditions and complications in the same reviewed articles. Ethics clearance was obtained from the senate research committee at UWC. The systematic review examined qualitative studies, including the qualitative components of mixed method studies published between January 2006 and June 2017. The databases that were searched are EbscoHost, JSTOR, Sage Journals Online, ScienceDirect, SpringerLink, Sabinet, Scopus, Emerald eJournals Premier, Pubmed, as well as Taylor and Francis Open Access eJournals. The study evaluated the literature found on these databases for methodological quality by using three stages of review (i.e. abstract reading, title reading, and full-text reading) and applying a meta-synthesis to the current evidence on the research topic. The findings provide empirical evidence based on sound research that medical conditions and complications (i.e. HELLP syndrome, thrombophilia, gestational diabetes, maternal near-miss syndrome, foetal abnormality, preterm birth, hypertension, and uterine rupture) are associated with women’s emotional and psychological experiences (i.e. fear, shock, feeling frightened, sadness, worry, alienation, frustration, grief, guilt, anger, ambivalence, despair, upset, loneliness and isolation, anxiety, depression, and PTSD) throughout their high-risk pregnancies. As a result of this, survivors of severe pregnancy complications have subsequent psychological and emotional challenges. It is therefore recommended that future researchers consider including quantitative studies in a systematic review on the same topic.