Made available in DSpace on 2014-10-09T12:28:15Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:04:05Z (GMT). No. of bitstreams: 0 / O 67Ga é um importante radiofármaco usado para identificar processos inflamatórios em doenças crônicas, diagnóstico por imagem de tumores em tecidos moles e a possibilidade de avaliar o resultado para intervenção terapêutica. Neste trabalho desenvolveu-se um módulo de processamento de 67Ga, com o objetivo de reduzir as intervenções na célula quente, causadas pela oxidação dos materiais metálicos e desgastes nas mangueiras das bombas peristálticas, que soltavam resíduos e bloqueavam a passagem através das válvulas utilizadas no processo. Utilizaram-se materiais como: acrílico, PVC, PEEK e teflon e vácuo como meio de transferência de fluidos líquidos na maioria dos procedimentos, com estas modificações obteve-se redução no comprimento das mangueiras de transferência, aumentando o rendimento do processo com menos intervenções para manutenção e menos tempo de exposição dos trabalhadores à radiação, garantindo a qualidade e reduzindo-se o tempo do processamento. Utilizando-se um sistema móvel para deslocamento do módulo de processamento, facilitou-se a limpeza e manutenção da célula que opera com material radioativo, atendendo-se a Resolução da Diretoria Colegiada da ANVISA que dispõe sobre as Boas Práticas de Fabricação de Medicamentos (RDC-17). / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

O presente trabalho, apresenta resultados da investigação experimental e da análise computacional acerca do método de ensaio de anéis de aço para obtenção do valor do coeficiente de atrito, existente na região de contato entre as matrizes e os corpos de prova. Buscando atingir os objetivos, foi feito um planejamento do experimento, através do programa MINITAB (2000), levando-se em consideração as variáveis do processo para forjamento a quente de peças para indústria automotiva, os experimentos foram realizados nos laboratórios da Universidade Federal do Rio Grande do Sul (UFRGS). A simulação do ensaio de anel permitiu uma boa estimativa da redução de diâmetros dos mesmos, bem como, do fluxo de material no interior dos anéis e da superfície neutra. A análise estatística dos resultados mostrou que a variável mais importante a afetar o coeficiente de atrito foi a temperatura, seguindo-se do tipo de revestimento das ferramentas, velocidade e material. Para um estudo mais pormenorizado do efeito do material a ser forjado, do recobrimento das ferramentas e da rugosidade das mesmas no coeficiente de atrito será necessário um maior número de repetições dos experimentos. / The present work introduces the result of the experimental investigation and computing analyses regarding the method of trial with steel rings as to obtain the value of friction coefficient, which exist in the contact area between the tools and test bodies. Aiming to reach the objectives, a design of experiments was established through the program MINITAB (2000) taking into account the process variables in order to hot forge parts for the automotive industry, being such experiments accomplished at the laboratories of the Universidade do Rio Grande do Sul (UFRGS). The simulation trial of the ring allowed for good estimate of its diameters reduction as well as internal material flow in the rings and in the neutral surface. The static analyses of the results demonstrated that the most important isolated variable to affect the friction coefficient was temperature, followed by the type of tools covering, velocity and material. However a bigger number of experiments repetitions will be necessary in order to reach a more detailed study about the effect of the material to be forged, of tools covering and roughness in the friction coefficient as well.

No description available.

Slow seismic velocity anomalies are commonly imaged beneath subducting slabs in tomographic studies, yet a unifying explanation for their distribution has not been agreed upon. In South America two such anomalies have been imaged associated with subduction of the Nazca Ridge in Peru and the Juan Fernandez Ridge in Chile. Here we present new seismic images of the subslab slow velocity anomaly beneath Chile, which give a unique view of the nature of such anomalies. Slow seismic velocities within a large hole in the subducted Nazca slab connect with a subslab slow anomaly that appears correlated with the extent of the subducted Juan Fernandez Ridge. The hole in the slab may allow the subslab material to rise into the mantle wedge, revealing the positive buoyancy of the slow material. We propose a new model for subslab slow velocity anomalies beneath the Nazca slab related to the entrainment of hot spot material.

The Springfontein Prospect is a Tertiary aged epithermal Hot Spring deposit that was investigated for precious metal mineralisation. It is located some 14 kilometres due west of East London (Cape Province), within Beaufort Group sediments and Karoo dolerite. Prior to the work described in this case study, the location was known for it's abundant plant fossils and barite mineralisation. A gossan sample collected near the main barite vein returned 1,07 g/t Au and 26,6 g/t Ag. Remote sensing studies of the site revealed a set of north-south lineaments paralleling the barite vein system. Geophysical surveys confirmed this orientation and revealed an extensive alteration system underlying the prominent sinter terrace. A detailed soil geochemical survey returned elevated values in the classical epithermal gold mineralisation element suite (Rg, Tl, As, Bi, Sb, Te, Mo, Ba and Pb - Bonham, 1986). Trenching of geochemical anomalies revealed zones of intense argillic alteration and vein stockworks). Four percussion and three diamond drill holes intersected a 'feeder-fissure' system of veins, alteration and brecciation, but failed to repeat gold levels seen at surface. Mineralogical and petrographic studies of the cores determined temperatures of formation of important indicator minerals (e.g. adularia and zeolites). Litho-geochemical work revealed mercury (and thallium) to be most elevated in the feeder systems. Stratigraphic and paleontological observations determined that the Springfontein Tertiary deposit was clearly different to the other siliceous (silcrete) units that crop out in the Eastern Cape region. A number of distinguished visitors to the prospect, with epithermal deposit experience, confirmed that the characteristics and dimensions of the system is within those of mineralised deposits elsewhere. A brief review of current epithermal models are presented. The conceptual geological model for the Springfontein prospect evolved through the exploration programme. The final consensus is that it best fits Bonham's (1986) alkalic model and the Tertiary epithermal event was sustained by rifting associated with the break-up of Gondwanaland.

No description available.

M.Ing. / The refrigerant R22, which is currently used in hot water heat pumps, delivers a maximum hot water temperature of 60 to 65 °C. This temperature is adequate for domestic use, but low if compared to temperatures that can be delivered by fossil fuels and direct electric resistance systems. This limits the potential applications of hot water heat pumps. In this study two analytical design methodologies were developed that can be used to predict the performances of water-to-water heat pumps. The first design methodology is for a pure R22 heat pump and the second for a non-azeotropic refrigerant mixture of R22 and R142b. These design methodologies were used as tools together with three methods of comparison to determine the influence of a non-azeotropic refrigerant mixture (R22 mixed with R142b) on the performance of a hot water heat pump. It was found in certain cases that, depending on the concentrations, not only are increased hot water temperatures possible but also an improved heating capacity, an improvement in the coefficient of performance and a reduction in pressure ratio of the compressor.

abstract: More than 200 hikers are rescued annually in the greater Phoenix area. This study examined the impact of hiking in hot (HOT), dry temperatures versus moderate (MOD) temperatures on dietary intake behaviors as well as markers of heat stress. Twelve recreational mountain hikers climbed “A” Mountain four consecutive times (4-miles) on a HOT day (WBGT=31.6 °C) and again on a MOD day (WBGT= 19.0 °C). Simulated food and fluid behavior allowed participants to bring what they normally would for a 4- mile hike and to consume both ad libitum. The following heat stress indicators (mean difference; p-value), were all significantly higher on the HOT hike compared to the MOD hike: average core temperature (0.6 °C; p=0.002), average rating of perceived exertion (2.6; p=0.005), sweat rate (0.54; p=0.01), and fluid consumption (753; p<0.001). On the HOT hike, 42% of the participants brought enough fluids to meet their individual calculated fluid needs, however less than 20% actually consumed enough to meet those needs. On the MOD hike, 56% of participants brought enough fluids to meet their needs, but only 33% actually consumed enough to meet them. Morning-after USG samples ≥1.020 indicating dehydration on an individual level showed 75% of hikers after the HOT hike and 67% after the MOD hike were unable to compensate for fluids lost during the previous day’s hike. Furthermore, participant food intake was low with only three hikers consuming food on the hot hike, an average of 33.2g of food. No food was consumed on the MOD hike. These results demonstrate that hikers did not consume enough fluids to meet their needs while hiking, especially in the heat. They also show heat stress negatively affected hiker’s physiological and performance measures. Future recommendations should address food and fluid consumption while hiking in the heat. / Dissertation/Thesis / Masters Thesis Nutrition 2020

Introduktion/Bakgrund: Hot och våld på arbetsplatser är ett globalt problem och mest drabbade är de inom hälsosektorn. Sjuksköterskor har visats vara mest drabbade eftersom de jobbar närmast patienterna. Patienter som kommer till akutmottagningar har höga förväntningar och lite tålamod, vilket ibland resulterar i frustration och aggression. Syfte: Att belysa sjuksköterskors upplevelser av hot och våld på akutmottagning. Metod: Litteraturstudie som utformats enligt Polit och Beck (2021) nio steg. Bearbetning och analys av data utfördes strategiskt gentemot syftet och slutligen återstod 13 vetenskapliga artiklar som studien baserats på. Resultat: Sjuksköterskors upplevelser av hot och våld redovisades genom fyra följande teman; att känna sig otrygg, att känna sig otillräcklig, att uppleva psykiska konsekvenser och behov av stöd. Slutsats: Studiens resultat visade att sjuksköterskorna känner sig otrygga på arbetsplatsen och att de riskerar att bli utsatta för hot och våld. Många av sjuksköterskorna drabbas av kortvariga och långvariga psykiska konsekvenser som ångest, depression, stress och känslor av dålig motivation och otillräcklighet. Bland annat till följd av otillräckligt eller uteblivet stöd från verksamheten efter våldsincident.

The project deals with the effect of the airflow and temperature on the gold wirebond due to possible application in hot-wire anemometry. Theoretical fundamentals of wirebonding and hot-air anemometry are included in the text. From the area of anemometry, there is also a detailed description of measurement principles, areas of application and measuring instruments. The practical part of the text deals with design of the experimental sensor for hot-wire anemometry with use of the gold wirebond, including also the verification of the sensor's properties.