Parallel mechanisms are characterized by their kinematic structure presented a closed kinematic chain. The end effector of mechanism is then bound to a base of over one arm. This design provides an advantage especially at high stiffness of mechanism and related properties. The disadvantage of such a structure is then usually very limited working space. In terms of simulation modeling is the construction due to its complexity rather problematic. The aim of work is design comprehensive simulation model chosen parallel mechanism and its analysis in selected working modes. Expected to use Adams simulation environment, if necessary. Matlab - SimMechanics and Ansys.

Understanding of beliefs, attitudes, and behaviors toward health issues, such as physical inactivity, within certain populations are often studied to design programs and interventions specific to communities. A total of six elementary schools were chosen in the Mississippi Delta, two elementary schools within three school districts, to provide a deeper understanding of barriers to physical activity. Fortyour parents and guardians of elementary aged children participated in focus groups to discuss current physical activity levels and factors impacting and limiting local children’s physical activity levels. The most frequently reported barriers were environmental issues such as fear of children’s safety, lack of resources, and individual and social constraints such as time, parental influences, and television viewing. Concerns about safety and violence were the most frequently mentioned issues among participants. Collection through other methods of research is needed to further understand and assess the problems faced in this region.

No description available.

Indiana University-Purdue University Indianapolis (IUPUI) / Environmental exposure to lead (Pb) and cannabis use are two of the largest public health issues facing modern society in the United States and around the world. Exposure to Pb in early life has been unequivocally shown to have negative impacts on development, and recent research is mounting showing that it may also predispose individuals for risk of developing substance use disorders (SUD). At the same time, societal and legal attitudes towards cannabis (main psychoactive component delta-9-tetrahydrocannabinol) have been shifting, and many American states have legalized the recreational use of cannabis. It is also the 3rd most widely used drug of abuse in the US, and rates of cannabis use disorder are on the rise. This thesis sets out to establish whether there is a link between early life Pb exposure and later THC-related behavior in C57BL6/J mice, as has been demonstrated for other drugs of abuse. The first aim seeks to answer whether Pb exposure affects physiological THC sensitivity (as measured by the cannabinoid-induced tetrad). The second aim seeks to answer whether Pb exposure affects edible THC self-administration and the development of THC tolerance (also measured by the tetrad). It was hypothesized that Pb exposure would decrease THC sensitivity (Aim 1), would enhance THC self-administration (Aim 2), enhance the development of THC tolerance (Aim 2), and finally that sex-dependent effects of Pb-exposure and THC would be observed (Aims 1 & 2). These hypotheses ended up not being supported, but Aim 1 produced findings indicating that THC sensitivity was increased by Pb exposure, but only in female mice. Future research will hopefully be able to fully explore the implications of these findings.

No

published_or_final_version / Urban Planning / Master / Master of Science in Urban Planning

In this study we assessed growth laws of sub-delta crevasses in the Mississippi River delta plain, experimental laboratory deltas, and compared them to previously studied river dominated large deltas worldwide. Metrics for channel and delta geometry for each system were obtained using a combination of geospatial tools, bathymetric datasets, sediment size, and hydrodynamic observations. Most crevasses and experimental deltas appear to obey delta growth laws suggesting that they exhibit planform metrics similar to larger deltas. However, some channels within each system, exhibit outlier behavior (e.g. asymmetric growth) where channel length is much larger than channel width. Hydrodynamic observations and morphodynamic modeling results, support the role of confinement in governing this response, through direct lateral confinement of the receiving basin width and depth thus guiding channels, and indirect confinement caused by sediment cohesion, whereby natural levees guide the systems asymmetric channel growth.

thesis submitted to the School of Animal, Plant and Environmental Sciences, Faculty of Science, University of the Witwatersrand, Johannesburg in fulfillment of the requirements for the degree of Masters in Science. Johannesburg 2016. / The Okavango Delta in northern Botswana contains the largest, unfenced lion population in southern Africa, and is one of the most important population strongholds for the species on the continent. Despite its conservation importance, however, little information has been published on the drivers of lion ecology in this unique wetland ecosystem. In the Okavango Delta, the annual flood pulse causes dramatic seasonal contractions of available dry land, and consequently variable distribution and abundance of prey. Lions must therefore adapt to a dynamic environment not only on an annual basis, but also on a longer time-scale as inundation patterns cycle from periods of low to high floods. The main aim of the study was to determine which social and ecological factors were most important in determining lion population demographics and social organisation in the unique wetland environment of the Okavango Delta. Data were intensively collected on demographic rates and social organisation of five resident lion prides in the south-western Okavango Delta from 1997 to 2004, during which inundation patterns shifted from low to high floods. We investigated the effects of two ecological factors, namely prey availability and flood extent, and one social factor, namely intra-specific competition, on lion social organisation and population demographics. Lions occurred at high densities, and the population was regulated socially and not by resource limitation. Our results indicated that competition with neighbours exerted the most extensive influence on the lion population and significantly affected the survival of young cubs and reproductive rates. Competition reduced pride size, but contrary to our expectations, also negatively influenced sub-group size, indicating that territorial disputes do not drive sub-group patterns in the Okavango Delta. Prey availability did not appear to be an important limiting factor for the population, and group sizes were inversely related to prey availability, most likely due to habitat saturation resulting in higher levels of recruitment. Prey availability only influenced survival of young cubs, which are most vulnerable to nutritional stress. Higher levels of flooding led to smaller pride and sub-group sizes, indicating that higher flood levels for extended periods may lead to a decline in lion densities due to increased competition for available dry land. While flooding exerted no direct effect on demographic rates, we posit that habitat conversion during high flood cycles causes a decline in prey, resulting in a time-lagged effect on the lion population. Our results show that during low flood cycles when herbivore abundance is high, lions occur at high densities and are largely self-regulated. However, as flood levels increase, prey availability declines and lions are placed under increasing pressure for space and resources, which could ultimately lead to population decline. From a conservation perspective, the south-western Okavango Delta population is thus most vulnerable during periods of high floods, when lion densities naturally decline, and lions may be pushed towards the veterinary fence where human-lion conflict is high. Future studies should focus on how anthropogenic threats around the Okavango Delta threaten the viability of the lion population in this conservation area, and seek to secure important corridors to neighbouring populations. Keywords: lion, Panthera leo, social organisation, pride size, population demographics, survival reproduction, Okavango Delta, flooding, competition, prey abundance / LG2017

INTRODUCTION: Since 2006, the Advisory Committee for Immunization Practices (ACIP) has recommended routine vaccination of adolescent girls at ages 11 or 12 years with 3 doses of human papillomavirus (HPV) vaccine to prevent cervical cancer. Cervical cancer disparities exist for several populations in the United States. The topic is scantly documented in scholarly literature with modest knowledge of the uptake of the HPV vaccine in the Delta region. AIM: To examine the HPV vaccination coverage estimates in the counties and parishes that comprise the Delta Regional Authority (DRA) and compare with other non-DRA counties or parishes and the rest of US. This will provide vaccination coverage estimates for adolescent females in the DRA designated Delta region that will provide public health professionals with data for policy and programmatic decision-making. METHODS: We combined data from multiple survey years (2008-2012) from the National Immunization Survey-Teen (NIS-Teen). We conducted bivariate analyses to describe the distribution across selected socio-demographic characteristics and multivariable logistic regression models to produce adjusted prevalence ratios. RESULTS: Teens in the DRA had lower HPV vaccine initiation and completion rates compared to Non- DRA counties or parishes and the Rest of the US. The 3-dose HPV vaccination series completion rate among those who had initiated HPV vaccination and had 24 weeks between their first dose and the NIS interview date was 60.9% (95% CI: 55.8 – 65.8) among adolescent females in the DRA compared to 66.9 (95% CI: 63.7-70.0) of adolescent females in the Non-DRA counties and 67.6% (95% CI: 66.2-69.0) in the rest of the US. CONCLUSION: The low HPV vaccination coverage among adolescents in the DRA showed that it is important to implement additional strategies to increase HPV vaccination coverage that will prevent cancers associated with HPV in the DELTA Region. Stronger provider recommendations and awareness are important for increasing HPV vaccine uptake.

The thesis introduces a new technique that is an alternative method instead of applying deltas to literal file sequentially to retrieve a version from a repository. To my best knowledge / this is the first investigation about delta combination for copy/insert instruction type with many experimental results and conclusions. The thesis proves that the delta combination eliminates unnecessary I/O process for intermediate versions when delta application is considered, therefore reduces I/O time. Deltas are applied to literal sequentially to generate the required version in the classical way. Replace algorithm combines delta files which would be applied in delta application as combined delta, and applies it to literal to generate the required one. Apply runs in O (size (D)) time where D is the destination file and size (D) is its size. To retrieve nth version in a chain where 1st version is literal, it requires n-1 time apply. Replace algorithm runs in O (i + c * log2 n) time where i is the total length of all inserts, c is the total length of all copies in destination delta, and n is the number of instructions in source delta. To retrieve the same nth version, it requires n-2 time replace and one apply.