• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 379
  • 349
  • 44
  • 37
  • 33
  • 31
  • 30
  • 9
  • 7
  • 7
  • 7
  • 7
  • 7
  • 7
  • 7
  • Tagged with
  • 1069
  • 346
  • 205
  • 174
  • 139
  • 132
  • 121
  • 120
  • 114
  • 101
  • 96
  • 67
  • 66
  • 65
  • 64
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
531

Vyšetření klinických funkcí u pacientů s roztroušenou sklerózou mozkomíšní - změny po aerobním tréninku / Checking of clinical functions in patients with multiple cerebrospinal sclerosis - changes after the aerobic training

Sobotková, Lenka January 2007 (has links)
The aim of the this dissertation was to introduce a set of examinations of clinical functions in patients with multiple sclerosis (MS), which would be optimum for utilisation in physiotherapeutic practice, and also to compare changes to the individual examinations of this set after the patients underwent therapy consisting of aerobics training. We also monitored the persistence of the therapy's effect a month after its termination. The research was conducted on a set of 6 probands in the case of whom MS had been definitively confirmed, motor handicaps predominated, and the EDSS ranking was 3 to 5. Aerobic training took place twice a week for eight weeks. The intensity and length délka zátěže were stipulated individually according to the zátěžového vyšetření. After the therapy there were significant improvements (a p-value less than 0.05) only in the examination of cognitive functions, though we recorded a relatively significant improvement (a p-value of almost 0.05) in the case of investigations of balance, the functions of the upper limbs, and trembling in the upper limbs. On the other hand there was a relatively significant deterioration in the investigation of dysmetry in the lower limbs. We ascribe the overall minimal improvements in most of the functions investigated partly to the very unfavourable...
532

Physical activity levels and hypertension among University employees in Kigali-Rwanda

Banyangiriki, Jacques January 2009 (has links)
Masters of Science / Hypertension is the leading cause of cardiovascular diseases worldwide. There is evidence of the rising incidence and prevalence of chronic diseases of lifestyle in developing countries. Physical activity has been regarded as a commonly accepted modality for treating hypertension. The aim of this study was to determine if physical activity levels are associated with hypertension among employees of Kigali Institute Science and Technology in Kigali, Rwanda. A quantitative, cross- sectional design was used and all staff members (325 employees) of Kigali Institute of Science and Technology (KIST) represented the study population. Random sampling was used to determine the study sample. Data was collected by means of a self-administered questionnaire adopted from The International Physical Activity Questionnaire (IPAQ).Data analysis was done using Statistical Package for Social Sciences (SPSS) software version 15.0. Descriptive statistics using frequencies, percentages, means, and standard deviations and inferential statistics using Chi-square tests were employed. The data were presented with use of tables, figures, graphs, and pie charts. Ethical issues including obtaining permission for conducting the study,informed consent,anonymity,confidentiality, voluntary participation, and the right to withdraw from the study was observed in this study. The study found a prevalence of 34% participants with hypertension. The prevalence of hypertension was associated with age, smoking, drinking alcohol, suffering for diabetes mellitus, and body mass index (BMI). Over one-fifth of the participants in the physically active group were hypertensive while 68% of the participants in the physically inactive group were hypertensive. This study shows that hypertension status is strongly associated with physical activity levels [X² = 20.381 with(P<0.001)].The study further showed that smoking and suffering from diabetes mellitus were also associated with levels of physical activity (P = 0.003 and p = 0.004 respectively). The current study concludes that physical activity is needed for employees at Kigali Institute of Science and Technology as part of preventive measures for chronic diseases of lifestyle.Therefore, the recommendations were proposed to various categories of people and stakeholders to be actively involved in the promotion of physical activity among employees of Kigali Universities in Rwanda.
533

Comparitive validity of ice-skating performance tests to assess aerobic capacity

Kuisis, S.M. (Suzan Mary) 25 April 2008 (has links)
Please read the abstract in the section 00front of this document / Thesis (DPhil (Human Movement Science))--University of Pretoria, 2008. / Biokinetics, Sport and Leisure Sciences / DPhil / unrestricted
534

Integrated anaerobic/aerobic bioprocess environments and the biodegradation of complex hydrocarbon wastes

Ehlers, George A C January 2004 (has links)
An investigation of the biodegradation of complex hydrocarbon wastes, with emphasis on chlorinated aromatic compounds, in an anaerobic/aerobic bioprocess environment was made. A reactor configuration was developed consisting of linked anaerobic and aerobic reactors which served as the model for a proposed bioremediation strategy targeting subterranean soil/sediment/aquifer chlorinated phenol-contaminated environments. Here oxygen is frequently limited and sulphate is readily available, as occurs especially in marine sediment and intertidal habitats. In the anaerobic system the successful transformation and mobilization of the model contaminant, 2,4,6-trichlorophenol, was shown to rely on reductive dechlorination by a sulphate-reducing dependent dechlororespiring co-culture. This was followed in the aerobic system by degradation of the pollutant and its metabolites, 2,4-dichlorophenol, 4-chlorophenol and phenol, by immobilized white-rot fungi.The strategy was initially investigated separately in laboratory bench- and intermediate scale reactors whereafter reactors were linked to simulate the integrated biodegradation strategy. The application of the fungal reactor to treat an actual waste stream by degrading complex mixtures of hydrocarbons in a waste oil recycling effluent was also investigated. The mineralization of phenol and 2,4,6-TCP by immobilized fungal cultures was studied in pinewood chip and foam glass bead-packed trickling reactors. The reactors were operated in sequencing batch format. Removal efficiency increased over time and elevated influent phenol and TCP (800 and 85 mg.L⁻¹) concentrations were degraded by > 98 % in 24 – 30 h batch cycles. Comparable performance between the packing materials was shown. Uptake by the packing was negligible and stripping of compounds induced by aeration had a minimal effect on biodegradation efficiency. Reactor performances are discussed in relation to sequencing batch operation and nutrient requirements necessary to sustain fungal activity in inert vs. organic material packed systems. It was shown that a co-culture consisting of sulphate-reducing and dechlororespiring bacteria established in fed-batch and soil flasks, as well as pine chip-packed fluidized bed reactors. Results showed reductive dechlorination of 2,4,6-TCP to be in strict dependence on the activity of the sulphate-reducing population, sulphate and lactate concentrations. Transformation to 2,4-DCP, 4-CP and phenol was enhanced in sulphate deficient conditions. Dechlororespiring activity was found to be dependent on the fermentative activity of sulphate-reducing bacteria, and the culture was also shown to mobilize and dechlorinate TCP in soils contaminated with the pollutant. Linking the systems achieved degradation of the compound by > 99 % through fungal mineralization of metabolites produced in the dechlororespiring stage of the system. pH correction to the anaerobic reactor was found to be necessary since acidic effluent from the fungal reactor inhibited sulphate reduction and dechlorination. The fungal reactor system was evaluated at intermediate-scale using a complex waste oil recycling effluent. Substantial COD reduction (> 96 % in 48 h batch cycles) and removal of specific effluent hydrocarbon components was shown in diluted, undiluted (COD > 37 g.L⁻¹) and 2,4,6-TCP-spiked effluents. Industrial application of the fungal reactor was evaluated in a 14 m³ pilot plant operated on-site at a waste oil processing plant.
535

The use of aerobic exercise as an occupational therapy intervention for post traumatic stress disorder patients

Davis, Phyllis A. 10 March 1994 (has links)
Post Traumatic Stress Disorder (PTSD) is a psychiatric diagnosis receiving increased attention. Occupational therapists are becoming more involved with this diagnosis, particularly with Vietnam Veterans in Veteran Affairs Hospitals. Aerobic exercise is a treatment which has not been explored with this population. Depression and anxiety are symptoms commonly associated with PTSD. This study sought to determine whether aerobic exercise would reduce overall PTSD symptomatology, including depression and anxiety. Three psychological inventories: The Penn Inventory for PTSD, The Beck Depression Inventory (BDI), and The Beck Anxiety Inventory (BAI) and one physiological inventory: The Queens Step Test for VO2 Max were given to eighteen subjects before and after a four week period. Ten subjects engaged in no exercise, and eight subjects participated in an aerobic exercise program. Results indicate that aerobic exercise has a significant effect on reducing depression and anxiety and a marginal effect on their overall symptomatology.
536

Studies On Catalytic Oxygen Transfer Reactions In Organic Synthesis

Kesavan, V 01 1900 (has links) (PDF)
No description available.
537

The Acute Effects of Aerobic and Resistance Exercise on Blood Glucose Levels in Type 1 Diabetes

Yardley, Jane E. January 2011 (has links)
Aerobic exercise interventions involving individuals with type 1 diabetes have had little positive effect on blood glucose control as reflected by hemoglobin A1c. The few existing interventions involving resistance exercise, either alone or combined with aerobic exercise, while small in sample size, have had better outcomes. The purpose of this research program was to examine the changes in blood glucose levels during activity and for 24 hours post-exercise (as measured by continuous glucose monitoring) when resistance exercise is performed, either on its own or combined with aerobic exercise, as compared to aerobic exercise alone or no exercise. Twelve physically active individuals with type 1 diabetes performed 5 separate exercise sessions in random order separated by at least five days: 1) no exercise/control; 2) aerobic exercise (45 minutes of treadmill running at 60% VO2peak); 3) resistance exercise (45 minutes of weight lifting – 3 sets of 8 repetitions of 7 different exercises); 4) aerobic then resistance exercise (2 and 3 combined with the aerobic exercise first); 5) resistance then aerobic exercise (2 and 3 combined with the resistance exercise first). We found that resistance exercise was associated with a lower risk of hypoglycemia during exercise, less carbohydrate intake during exercise, less post-exercise hyperglycemia and more frequent (but less severe) nocturnal hypoglycemia than aerobic exercise. When aerobic and resistance exercise were combined, performing resistance exercise prior to aerobic exercise (rather than the reverse) resulted in attenuated declines in blood glucose during aerobic exercise, accompanied by a lower need for carbohydrate supplementation during exercise and a trend towards milder post-exercise nocturnal hypoglycemia.
538

Études des mécanismes d’oxydations aérobies des hydrocarbures lourds catalysées par les nanoparticules d’or / Mechanistic studies of the gold-catalyzed aerobic oxidation of bulky hydrocarbons

Guillois, Kevin 25 February 2012 (has links)
L’objectif de ce travail est de proposer un mécanisme réactionnel pour l’oxydation aérobie d’hydrocarbures lourds, alcanes et alcènes, catalysée par les nanoparticules d’or. La co-oxydation du stilbène et du méthylcyclohexane est utilisée comme réaction modèle afin de comprendre les nombreux mécanismes mis en jeu. Le criblage initial d’une large gamme de catalyseurs d’or nous permet de mettre en évidence des effets de support dans cette réaction et d’établir un cahier des charges bien défini pour l’élaboration d’un catalyseur de référence. Une méthode chimique simple est mise au point pour préparer un tel catalyseur. Ce catalyseur, optimisé pour les réactions en milieux organiques apolaires, est ensuite utilisé pour réaliser des études macrocinétiques en variant de nombreux paramètres expérimentaux : température, concentration des réactifs, quantité de catalyseur. Un intermédiaire réactionnel clef, l’hydroperoxyde de méthylcyclohexane, est identifié. Après dosage, l’étude de l’évolution de sa concentration au cours du temps dans les différentes conditions de réaction permet de valider le mécanisme réactionnel existant et de mieux comprendre l’importance de certaines étapes élémentaires / The aim of this work is to propose a mechanism for the gold-catalyzed aerobic oxidation of bulky hydrocarbons, alkanes and alkenes. The co-oxidation of stilbene and methylcyclohexane is used as a model reaction to study different mechanisms which can take place simultaneously. After an initial screening of different gold catalysts in this reaction, essential characteristics of a reference catalyst for organic reactions in apolar media are identified. Based on these requirements, a straight-forward, chemical bottom-up method is designed to prepare this reference catalyst. This catalyst is used for macro-kinetic studies of the co-oxidation by modifying experimental parameters, such as temperature, alkane/alkene ratio, and reactants initial concentration. One key reaction intermediate, 1-methylcyclohexyl hydroperoxide, is identified. After titration, following the evolution of the concentration of this intermediate with time under the various reaction conditions considered validates the existing mechanism and highlight the importance of some elementary steps of the co-oxidation
539

Treadmill validation of the Siconolfi step test.

Harkrider,Tiffani L. 05 1900 (has links)
Maximal oxygen uptake (VO2max) is the internationally recognized measure of a person's cardiorespiratory fitness. Currently the most accurate way of assessing one's true VO2max involves the use of maximal exercise tests, which require the use of specialized equipment, and are time consuming and costly. The purpose of this study was to determine the validity of the submaximal Siconolfi step test to estimate VO2max. A second purpose was to determine if body fat percentage improved the validity. Thirty-six individuals underwent a maximal treadmill test, in which VO2max was directly measured, and the step test. Results indicate that, although VO2max estimates generated by the Siconolfi step test are highly correlated to true VO2max (r =.887; p<.01), the values consistently underestimated a person's aerobic fitness. It was also determined that body fat percentage did not contribute to the prediction of VO2max.
540

Avaliação de um sistema combinado filtro anaeróbio/biofiltro aerado submerso com ênfase na recirculação do efluente e na caracterização do lodo / Evaluation of a combined anaerobic filter / aerated submerged biofilter with an emphasis on recycling the effluent and sludge characterization

Lopes, Guilherme Pio dos Reis, 1984- 22 August 2018 (has links)
Orientador: Edson Aparecido Abdul Nour / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo / Made available in DSpace on 2018-08-22T06:33:43Z (GMT). No. of bitstreams: 1 Lopes_GuilhermePiodosReis_M.pdf: 5051359 bytes, checksum: a6baba0b1f286eae52fc0c8f180ebf48 (MD5) Previous issue date: 2013 / Resumo: As vantagens do sistema combinado anaeróbio/aeróbio estão relacionadas às remoções de matéria orgânica e nutrientes, além de poder realizar a recirculação de lodo aeróbio excedente para a unidade anaeróbia a fim de garantir sua estabilidade, simplificando etapas do tratamento do lodo. Porém são poucos os estudos que enfatizam a avaliação da qualidade do lodo de descarte gerado em sistemas combinados que realizam apenas a recirculação do efluente tratado, sem a recirculação do lodo. Dessa forma, este trabalho teve como objetivo avaliar um sistema combinado anaeróbio/aeróbio, em escala de bancada, composto por filtro anaeróbio - FA (volume útil de 32,6 L) seguido de biofiltro aerado submerso - BAS (volume útil de 17,6 L) e de decantador secundário - DEC (volume útil de 7,2 L) com ênfase na recirculação do efluente e na caracterização do lodo gerado. A operação foi realizada de forma a manter otimizada tanto a remoção da matéria orgânica carbonácea e nitrogenada. A alimentação do sistema ocorreu com vazão constante de esgoto sanitário, produzindo um tempo de detenção hidráulica de 23,13 h. Foram avaliadas 5 razões de recirculação do efluente tratado: 0,5; 1,5; 2,0; 4,0 e 6,0 vezes a vazão do efluente bruto. Dentre os principais resultados destaca-se a não influência da razão de recirculação na eficiência de remoção de matéria orgânica, avaliada na forma de DQO, cujos valores se situaram entre 89 a 90%. A cada aumento no valor da razão de recirculação, até o valor de 4,0, houve uma diminuição da concentração de N-NH3 no efluente tratado, com valor de 3,2 ± 9,5 mg N-NH3 L-1, ocasionado tanto pelo efeito de diluição (aumento da recirculação), quanto pela conversão do N-NH3 a compostos oxidados de nitrogênio. A razão de recirculação de 6,0 vezes provocou um aumento na concentração de nitrogênio amoniacal no efluente tratado, 15,2 ± 9,5 mg N-NH3 L-1, indicando ser uma limitação para o processo. O monitoramento da qualidade do lodo de descarte no sistema combinado ocorreu no FA, BAS e DEC, onde foram utilizados como indicadores a relação de sólidos suspensos voláteis/sólidos suspensos totais (SSV/SST) e carbono orgânico total (COT). Esses valores foram correlacionados com aqueles obtidos em ensaio adaptado de respirometria de Bartha, utilizado com a finalidade de obter uma maior compreensão sobre o grau de estabilidade biológica. Apesar do lodo descartado do DEC possuir SSV/SST de 0,92 a 0,94, ele apresentou menores taxas de produção específica de CO2 no ensaio de respirometria, 0,056 a 0,073 mg CO2 mg SSV-1 dia-1. Como referência utilizou-se lodo não estabilizado de uma ETE em escala real, que apresentou valor médio de 0,087 ± 0,020 mg CO2 mg SSV-1 dia-1, com uma relação de SSV/SST de 0,70. O conjunto dos resultados, em especial o ensaio de respirometria, indicou que o lodo de descarte do DEC apresentava estabilização biológica, não havendo a necessidade de sua recirculção para a unidade anaeróbia / Abstract: The advantages of the combined anaerobic/aerobic relate to the removal of organic matter and nutrients, and can accomplish the recirculation of the surplus aerobic sludge to anaerobic unit to ensure its stability, simplifying steps of sludge treatment. But there are few studies that emphasize the quality evaluation of sludge discard generated in combined systems that perform only the recirculation of treated effluent without recirculation of sludge. Thus, this study aimed to evaluate a system combined anaerobic/aerobic, bench scale, composed of anaerobic filter - AF (useful volume of 32,6 L) followed by aerated submerged biofilter - ASB (useful volume of 17,6 L) and settling tank - ST (volume of 7,2 L) with emphasis on recirculation of the effluent and sludge generated in the characterization. The operation was performed in order to maintain optimal removal of both carbonaceous and nitrogenous organic matter. The system feeding occurred with constant flow of sewage, producing a hydraulic retention time of 23,13 h. We evaluated 5 reasons recirculation of treated effluent: 0,5; 1,5; 2,0; 4,0 and 6,0 times the flow of raw wastewater. Among the main results stands out the not to influence the recirculation ratio on removal efficiency of organic matter, measured as COD, whose values were between 89 - 90%. Every increase in the value of the recirculation ratio, until the value of 4,0, there was a decrease in the N-NH3 concentration in the treated effluent with a value of 3,2 ± 9,5 mg N-NH3 L-1, so much occasioned for the dilution effect (increased of the recirculation), and by the conversion of ammonia nitrogen for oxidized nitrogen compounds. The reason of recirculation of 6,0 times provoked an increase in the concentration of ammonia nitrogen in the treated effluent, 15,2 ± 9,5 mg N-NH3 L-1, indicating to be a limitation the process. The monitoring of the quality of the discard sludge in the combined system happened in the AF, ASB and ST, where they were used as indicators the relationship to volatile suspended solids/total suspended solids (VSS/TSS) and total organic carbon (TOC). These values were correlated with those obtained from respirometry assay adapted from Bartha's respirometric method, used in order to obtain a better understanding of the degree of biological stability. In spite of the discarded sludge of ST to possess VSS/TSS of 0,92 to 0,94, it presented smaller taxes of specific production of CO2 in the respirometry assay, 0,056 to 0,073 mg CO2 mg VSS-1 dia-1. As a reference we used non-stabilized sludge from a full-scale WWTP, which showed a mean value of 0,087 ± 0,020 mg CO2 mg VSS-1 dia-1, with a ratio of VSS/TSS 0,70. The set of results, in particular the respirometry test indicated that the discard sludge of ST had biological stabilization, without the need to drive your recirculation anaerobic / Mestrado / Saneamento e Ambiente / Mestre em Engenharia Civil

Page generated in 0.0413 seconds