No description available.

Viscoelastic surfactant (VES)-based acid systems have been used successfully in matrix and acid fracturing treatments. However, the existence of Fe (III) as a contaminant in such systems may lead to many problems, due to interactions between VES and Fe (III). Such interactions can reduce the effectiveness of VES-based acid systems and potentially lead to formation damage. In this study, two VES’s were selected and reaction mechanisms between VES and Fe (III) were studied. Rheological properties of these two surfactants were examined with various concentrations of Fe (III). An energy dispersive X-ray spectroscopy (EDS) was used to identify precipitates from reaction products. Inductively coupled plasma (ICP) was applied to measure iron concentrations, and the two-phase titration method was used to determine VES concentrations in all liquid phases of the sample. The effect of several chelating agents on the reaction of VES with Fe (III) was also examined. Experimental results indicate that the apparent viscosity of live VES-based acids (20 wt% HCl, 4 vol% VES) increased from 3 to 131 cp at a shear rate of 100 s-1 at room temperature when the Fe (III) concentration increased from 0 to 2,300 ppm, and started to decrease at higher Fe (III) concentrations. This is because of the electrostatic interactions between negative charged [FeCl4]- groups and positive charged amine groups in VES in live acids. Both surfactants interacted with Fe (III), and precipitates, which are complexes containing iron and VES, were noted at 5,000 ppm and higher concentrations of Fe (III). On the other hand, adding a chelating agent [1:1 mole ratio to Fe (III)] helped in reducing the apparent viscosity of the sample, which means that the chelating agent reacted with Fe (III) and reduced interactions between VES and Fe (III). At the same time, coreflood setup was also used. With a chelating agent, Fe (III) was recovered in 98%, which was much higher than that without any chelating agent (46%). These results provided a clue of the protection effect of a chelating agent on VES-based acid in Fe (III) containing environment. Adding a suitable chelating agent can minimize the impact of Fe (III) on VES-based acids.

Made available in DSpace on 2016-08-29T15:09:13Z (GMT). No. of bitstreams: 1 tese_4597_Daniele Ferreira Mugrabi.pdf: 8497271 bytes, checksum: 8e96b75963e526ffdbdf8138af3b155e (MD5) Previous issue date: 2011-02-22 / Dissomphalus Ashmead (Bethylidae, Pristocerinae) é um gênero de vespas parasitóides cosmopolitas e um dos mais especiosos de Bethylidae, composto por 243 espécies válidas. Dessas, 14 espécies são citadas para a região Oriental, oito conhecidas apenas por exemplares machos e seis conhecidas apenas por fêmeas. Desse total, são conhecidas quatro espécies para a Tailândia (D. browni Terayama, D. chiangmaiensis Terayama, D. thaianus Terayama e D. khaoyaiensis Terayama). A maior parte das contribuições em estudos taxonômicos em Dissomphalus foi dada por Evans e Azevedo e colaboradores que juntos publicaram 196 espécies válidas, grande parte conhecidas apenas para a região Neotropical. Na região Oriental não há tradição de coletas grandes, com isso, os estudos taxonômicos de Dissomphalus propostos para essa região são baseados em poucos exemplares coletados esporadicamente em pontos de alguns países como Sumatra, Tailândia, Taiwan, Borneo, Nepal, Índia e Filipinas. O projeto Thailand Inventory Group for Entomological Research (TIGER), promovido por University of Kentucky e National Science Foundation (NSF Grant n: DEB-0542864), promoveu coletas em toda extensão do território tailandês e coletou 2.051 exemplares machos de Dissomphalus. As coletas foram realizadas ao longo de 24 localidades, incluindo parques nacionais e santuários de animais selvagens, durante o período de 2006 a 2008 utilizando as armadilhas Malaise e Möricke, alçapão e extratores de Winkler. O tratamento taxonômico seguiu Winston (1999). As descrições foram geradas a partir do programa DEscription Language TAxonomy (DELTA) e a chave de identificação foi modificada a partir da chave gerada pelo mesmo programa. Os termos das estruturas corporais adotados nas descrições seguiram Evans (1964) e Azevedo (1999 (c), 2001) e os termos referentes à textura e esculturação do integumento foram propostos por Harris (1979). Os desenhos dos hipopígios foram feitos sob câmara clara adaptada ao microscópio óptico e as imagens das genitálias foram obtidas através do equipamento de Microscopia Eletrônica de Varredura (MEV). Nós encontramos 28 espécies, quatro previamente conhecidas (D. browni Terayama, D. chiangmaiensis Terayama, D. thaianus Terayama e D. wusheanus Terayama) e 24 descritas como novas para a ciência. Além das descrições das espécies novas, as espécies conhecidas tiveram o hipopígio e a genitália descritos e ilustrados. Foi também proposta uma chave de identificação para os machos de Dissomphalus da região Oriental.

This objectivist, experimental study investigated the influence of virtual expert systems (VES) on the decision accuracy of non-expert consultants within a technology consulting contact centre environment. Because of the overwhelming availability of conceptual information, non-expert consultants experience challenges in making accurate decisions, and would benefit from augmented technologies, such as VES. VES hold the ability to capture and scale large volumes of decision variables for consideration by human experts when making decisions. A total of 40 participants were randomly selected from contact centres in the Eastern Cape and Gauteng provinces of South Africa for this study. Human logic was captured and scaled into a technology fault finding virtual expert and administered as an experiment to group participants. The experimental and control group participants were randomly assigned to the respective groups of 20 participants each. The control group was exposed to the paper-based, fault-finding manual. The pre-test and post-test data were collected based on four decision accuracy measures, namely individual performance, average call handling time, first call resolution and customer service. The Clarify performance system of the participating technology consulting company was used as data collection tool to record the findings used for Chapter 5. Statistical data analyses were performed using ANOVA and two-tailed significance tests to test the relationship between VES and decision accuracy in the pre-test and post-test phases of the study. The study found that the participant scores on the decision accuracy measures were only statistically significant on the measure of first call resolution measure (significance score of a p value <.05). On the other (three) measures, the scores obtained from experimental group participants showed more improvement than that of the control group participants. Consequently, the hypothesis that the use of VES enhance decision accuracy amongst non-expert technology consultants was accepted and the alternative hypothesis rejected. Some limitations pertaining to the resultant Hawthorne effect (the effect when some employees work harder and perform better when they are participants in an experiment) was noted amongst participants. This effect resulted from the use of team leaders in monitoring performance during the experiment and the involvement of the technology consulting company in determining the performance norms of the identified measures. Another limitation of the study related to the size of the sample where only two provinces were included. The limitation may affect the generalisation of results to other future settings when such a study is repeated. It was recommended that future studies in this field should make provision for a larger population, inclusive of other provinces to avoid these limitations.

This diploma thesis aims to design the cycle route from the village of Nová Ves I to the town of Kolín and to describe its impact on the environment. The researching part of the thesis deals with cycling itself, its history and development. It further decribes the existing infrastructure for cycle paths and clarifies how the cycle paths should be planned properly. It also focuses on constructing of them. The researching part of the thesis next deals with the impact of the cycle trails on the environment and describes it in details. The thesis provides a detailed characterization of the territory. The particular characteristics serve as the basis for designing the most appropriate routing of cycle paths. The analytical part of the thesis contains several analyses which aim to help us find the best solution for designing the cycle route. All the analyses serve as a valuable basis for further decision making and designing the most convenient cycle route between the village of Nová ves I and the town of Kolín. In the designing part of the thesis there are four variants of the cycle route between the village of Nová Ves I and the town of Kolín. Each of them is described in details and evaluated. Eventually the best strategy for the route is selected and it is clarifed and proved by doing own research and measuring with using the mobile applications.

The thesis deals with landscape development in Nová Ves I. The historical development of landscape was based on the evaluation of three maps from different times. The chosen ones were Stable cadastral map (1841), an ortophotomap from 1950´s (1954) and a recent ortophoto map (2015). The first part of the thesis is dedicated to literary research, which is focused on demarcation of related issues. The second part is focused on data processing and analysis. Maps were processed by ArcGIS 10.2 software. Raster data were manually vectorised according to the chosen categories of landscape utilization. The maps of landscape utilization during the times are providing important information about landscape development, mostly in past 170 years. At the end, the results derived from the analysis are put into context with the overall objectives of land consolidation. That show us the possible benefits of land consolidation in area of interest.

The aim of the thesis was to make a constructional-historical research and dendrochronological dating of the roof frame (truss) of St. James´s church in Stará Ves near Bílovce (the district of Novy Jicin). It is the case of the roof frame structure of hammerbeam type which was made from fir timber. The result of the dendrochronological analysis has shown that the trees used for the construction of the roof of the nave were fell down between 1712 and 1713. The trees used for the construction of the roof over the chancel were also fell down between 1712 and 1713. The oak bell stool could not be reliably dendrochronologically dated. The results of the dendrochronological analysis correspond to the historical development of the church found out from the literary and historical sources

No description available.

As sondagens elétricas verticais (SEV) e as sondagens eletromagnéticas no domínio do tempo (TDEM) são muito usadas em estudos ambientais, hidrogeológicos e em exploração mineral. A interpretação desses dados feita individualmente com modelos unidimensionais normalmente acarreta em resultados ambíguos. Isso acontece devido ao fato de que cada metodologia enxerga a subsuperfície de uma forma diferente. No caso da SEV as estruturas resistivas são bem detectadas, já no caso da sondagem TDEM as estruturas condutivas é que são detectadas com melhor precisão. Outra diferença é a capacidade da SEV conseguir identificar melhor as estruturas rasas, por outro lado, as sondagens TDEM permitem investigar as estruturas mais profundas. Nesta pesquisa foram exploradas as potencialidades das SEVs e das sondagens TDEM, visando obter uma interpretação dos dados mais consistentes. Neste sentido foi desenvolvido um programa em Matlab para a inversão conjunta 1D de dados de SEV e TDEM, na qual explora \"o melhor\" de ambos os métodos. O algoritmo desenvolvido foi testado inicialmente com dados sintéticos e posteriormente foi empregado em dados reais adquiridos na bacia sedimentar do Paraná, na região de Bebedouro no Estado de São Paulo. O resultado final da inversão conjunta de dados de SEV/TDEM permitiu obter um modelo geoelétrico que mais se assemelha às condições geológicas reais, e cujas ambigüidades, que são inerentes ao processo de interpretação, foram minimizadas. Os resultados tanto com dados sintéticos quanto com dados reais foram são bastante promissores, mostram uma melhor recuperação dos meios modelados e um grande potencial de aplicações em estudos geocientíficos, em particular em estudos hidrogeológicos. / Electrical (DC) and transient electromagnetic (TEM) soundings have been used in a great number of environmental, hydrological and mining exploration studies. The data interpretation usually is done individually by 1D models resulting in ambiguous results. This fact can be explained by how the two different methodologies observe the medium below the surface. The vertical electrical sounding (VES) is good at marking very resistive structures, while the transient electromagnetic sounding (TEM) is very sensitive to map conductive structures. Another difference is that the VES detects better shallow structures, while the TEM soundings can reach deeper ones. In this research we explore the potentials of the both VES and TEM soundings, in order to obtain a more consistent interpretation of the data. In this way, a Matlab program for the joint inversion for DC and TEM soundings was developed aiming explore the best of the both methods. Initially, the algorithm was tested with synthetic data and after were used real data from Paraná Sedimentary Basin in Bebedouro region, São Paulo State. The geoelectrical model obtained from joint inversion of DC and TEM data are more similar to the real geological condition and the ambiguities were minimized. The results with synthetic and real data shows that the joint inversion of DC/TEM is better for recovering the simulated models and shows a great potential in geological studies, particularly in hidrogeological studies.

As sondagens elétricas verticais (SEV) e as sondagens eletromagnéticas no domínio do tempo (TDEM) são muito usadas em estudos ambientais, hidrogeológicos e em exploração mineral. A interpretação desses dados feita individualmente com modelos unidimensionais normalmente acarreta em resultados ambíguos. Isso acontece devido ao fato de que cada metodologia enxerga a subsuperfície de uma forma diferente. No caso da SEV as estruturas resistivas são bem detectadas, já no caso da sondagem TDEM as estruturas condutivas é que são detectadas com melhor precisão. Outra diferença é a capacidade da SEV conseguir identificar melhor as estruturas rasas, por outro lado, as sondagens TDEM permitem investigar as estruturas mais profundas. Nesta pesquisa foram exploradas as potencialidades das SEVs e das sondagens TDEM, visando obter uma interpretação dos dados mais consistentes. Neste sentido foi desenvolvido um programa em Matlab para a inversão conjunta 1D de dados de SEV e TDEM, na qual explora \"o melhor\" de ambos os métodos. O algoritmo desenvolvido foi testado inicialmente com dados sintéticos e posteriormente foi empregado em dados reais adquiridos na bacia sedimentar do Paraná, na região de Bebedouro no Estado de São Paulo. O resultado final da inversão conjunta de dados de SEV/TDEM permitiu obter um modelo geoelétrico que mais se assemelha às condições geológicas reais, e cujas ambigüidades, que são inerentes ao processo de interpretação, foram minimizadas. Os resultados tanto com dados sintéticos quanto com dados reais foram são bastante promissores, mostram uma melhor recuperação dos meios modelados e um grande potencial de aplicações em estudos geocientíficos, em particular em estudos hidrogeológicos. / Electrical (DC) and transient electromagnetic (TEM) soundings have been used in a great number of environmental, hydrological and mining exploration studies. The data interpretation usually is done individually by 1D models resulting in ambiguous results. This fact can be explained by how the two different methodologies observe the medium below the surface. The vertical electrical sounding (VES) is good at marking very resistive structures, while the transient electromagnetic sounding (TEM) is very sensitive to map conductive structures. Another difference is that the VES detects better shallow structures, while the TEM soundings can reach deeper ones. In this research we explore the potentials of the both VES and TEM soundings, in order to obtain a more consistent interpretation of the data. In this way, a Matlab program for the joint inversion for DC and TEM soundings was developed aiming explore the best of the both methods. Initially, the algorithm was tested with synthetic data and after were used real data from Paraná Sedimentary Basin in Bebedouro region, São Paulo State. The geoelectrical model obtained from joint inversion of DC and TEM data are more similar to the real geological condition and the ambiguities were minimized. The results with synthetic and real data shows that the joint inversion of DC/TEM is better for recovering the simulated models and shows a great potential in geological studies, particularly in hidrogeological studies.