Tesi sul tema "Pandi"
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Pandi, Parthasarathy [Verfasser], e N. [Akademischer Betreuer] Zarzalis. "Direct Pore Level Simulation of Heat Transfer in Open Cell Reticulated Porous Ceramics / Parthasarathy Pandi. Betreuer: N. Zarzalis". Karlsruhe : KIT-Bibliothek, 2016. http://d-nb.info/1093559225/34.
Testo completo
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Kocmanová, Michaela. "Panda a panda". Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-410028.
Testo completoAbstract (sommario):
This diploma thesis presents a project documentation for construction of a zoo pavilion with a restaurant. The structure has to be designed in compliance with regulations for buildings with almost zero energy consumption. Its construction site is located within the existing compound of Prague’s zoo on plot no. 1491/1. The pavilion is proposed to house giant pandas. The building has three floors- one underground and two above. It is covered by a flat green roof. In terms of circulation, the structure is composed from two parts. The first one is formed by premises for the pandas, including necessary facilities for their wellbeing and their breeding; and the second part is visitors’ part, including restaurant, gift shop and amenities. The building is enclosed by two exterior expositions for pandas which are connected with the interior exposition premises by two ramps- tunnels. There is a roof terrace adjacent to the restaurant for visitors to enjoy the view of pandas in their exterior grounds. The vertical structure of the pavilion for giant pandas is a combination of load bearing brick walls and cast-in-place concrete walls- the underground floor and the ground floor is formed by the cast-in-place concrete walls and the upper floor is formed by the brick walls made out of autoclaved aerated concrete blocks. The horizontal structures are formed by prestressed concreted floor panels or in the case of the upper floor by cast-in-place reinforced concrete slabs.
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Kersey, David C. "Reproductive and adrenal endocrinology of the giant panda (Ailuropoda melanoleuca)". Fairfax, VA : George Mason University, 2008. http://hdl.handle.net/1920/3428.
Testo completoAbstract (sommario):
Thesis (Ph.D.)--George Mason University, 2008.Vita: p. 180. Thesis director: Thomas C. Wood. Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Environmental Science and Public Policy. Title from PDF t.p. (viewed Mar. 17, 2009). Includes bibliographical references (p. 156-179). Also issued in print.
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MONSALVE, Johanna Gil. "Oscilação da magnetização em nanocompósitos de Fe3O4/PANI e γFe2O3/PANI". Universidade Federal de Pernambuco, 2017. https://repositorio.ufpe.br/handle/123456789/22658.
Testo completoAbstract (sommario):
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Johanna Gil Monsalve-Mestrado em Física-2017.pdf: 10870901 bytes, checksum: 67643f5c7354715fef750e27e8a09257 (MD5)Made available in DSpace on 2017-12-21T18:46:39Z (GMT). No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) Johanna Gil Monsalve-Mestrado em Física-2017.pdf: 10870901 bytes, checksum: 67643f5c7354715fef750e27e8a09257 (MD5) Previous issue date: 2017-02-15
Estudos recentes mostram que o nanocompósito Fe3O4/PANI tem propriedades magnéticas interessantes, como oscilações sustentadas na magnetização, que foram interpretadas como o resultado de uma reação química oscilante que faz que uma fração do conteúdo de magnetita seja transformada em maghemita e vice-versa [1]. Neste trabalho fizemos estudos adicionais. Variamos parâmetros como temperatura, tipo e concentração de ácidos, além de usar como ponto de partida óxidos comerciais e de tamanho maior. Produzimos ainda nanocompósitos Fe2O3/PANI sob as mesmas condições usando Fe2O3 ao invés de Fe3O4. Para os nanocompósitos produzidos estudamos as propriedades magnéticas e estruturais e a cinética química da reação através da magnetização da solução precursora. Os nanocompósitos Fe3O4/PANI e Fe2O3/PANI foram preparados sob UV (365nm) a diferentes tempos de exposição e sob aquecimento (40, 60 e 80 °C), mediante a dispersão das nanopartículas de magnetita e maghemita em uma solução ácida de anilina. Para o estudo de suas propriedades foram usadas medidas de difração de raios X (DRX), análises termogravimétricas e de calorimetria de varredura diferencial (TGA e DSC). Para a caracterização magnética foi usado um magnetômetro de amostra vibrante (VSM) para obter curvas de histereses, plot de Henkel, verificação das mudanças na transição de Verwey e estudo da cinética química a partir da magnetização da solução líquida precursora dos nanocompósitos. Este último resultado foi analisado segundo modelo presa-predador de Lotka Volterra, um modelo simples, qualitativo, para esse sistema relativamente complexo e caótico. As curvas de histerese dos nanocompósitos sintetizados a 40 ºC mostraram oscilações na magnetização; enquanto que para 60 e 80 °C sob UV mostraram um decréscimo acentuado na magnetização máxima com o tempo de reação. As curvas do plot de Henkel mostraram que predominam efeitos de interação de natureza desmagnetizante. Foi observada a transição Verwey, mas deslocada da temperatura típica para os nanocompósitos sintetizados a 40 ºC, sugerindo que isso seja uma evidência das mudanças do número de oxidação do Fe provocados pela polimerização e radiação UV. Finalmente, usando o modelo Lotka-Volterra e suas propriedades matemáticas intrínsecas, verificamos o efeito nos parâmetros do modelo provocados pela mudança de alguns parâmetros importantes da reação. A caracterização estrutural mediante DRX mostraram que todas as nanopartículas são cristalinas exceto para as amostras de 80 ºC após de 1 h de reação. Os difratogramas para as amostras de Fe3O4/PANI tratadas a 60 ºC mostraram um deslocamento dos picos característicos indicando a transformação magnetita/maghemita/magnetita. Aparece também uma nova fase cristalina, a qual foi indexada como hematita. Por outro lado, não há variações muito significativas do tamanho de cristalito para Fe3O4/PANI, enquanto que para os nanocompósitos Fe2O3/PANI tratados a 60 ºC há um leve aumento no tamanho de cristalito com o tempo de síntese, assim como com o aumento na temperatura. A análise TGA e DSC mostrou que a polimerização é favorecida pelo calor e pelo tempo de reação. Além disso, conforme o esperado pelo modelo proposto por A. C. V de Araújo e col. [1], a polimerização para os nanocompósitos Fe2O3/PANI é mais acelerada que Fe3O4/PANI.
Recent studies show that the Fe3O4/PANI nanocomposite has interesting magnetic properties, such as sustained oscillations in magnetization, which have been interpreted as the result of an oscillating chemical reaction that causes a fraction of the magnetite content to be transformed into maghemite and vice-versa [1]. In this work we did additional studies. Where we had changed parameters such as temperature, type and concentration of acids, as well as using commercial oxides with larger sizes. We have also produced Fe2O3/PANI nanocomposites under the same conditions using Fe2O3 instead of Fe3O4. For the produced nanocomposites, we have studied the magnetic and structural properties as well as the chemical kinetics of the reaction through the magnetization of the precursor solution. The Fe3O4/PANI and Fe2O3/PANI nanocomposites were prepared under UV (365 nm) at different exposure times and under heating (40, 60 and 80 °C) by dispersing the nanoparticles of magnetite and maghemite in an acid solution of aniline. X-ray diffraction (XRD), thermogravimetric and differential scanning calorimetry (TGA and DSC) measurements were used to study their properties. For the magnetic characterization, a vibrating sample magnetometer (VSM) was used to obtain hysteresis curves, Henkel plot, verify changes in the Verwey transition and study the chemical kinetics from the magnetization of the liquid precursor solution of the nanocomposites. This last result was analyzed according to the prey-predator model of Lotka-Volterra, a simple, qualitative model for this relatively complex and chaotic system. The hysteresis curves of the nanocomposites synthesized at 40 ºC showed oscillations in the magnetization; while for 60 and 80 °C under UV showed a marked decrease in the maximum magnetization as function of the reaction time. Henkel plot curves showed that the interaction effects have a predominant demagnetizing nature. Verwey transition was observed, but displaced from the typical temperature for the 40 ºC synthesized nanocomposites, suggesting that this is an evidence of the changes in the oxidation number of Fe caused by polymerization and UV radiation. Finally, using the Lotka-Volterra model and its intrinsic mathematical properties, we verified the effect on the parameters of the model caused by the change of some important parameters of the reaction. The structural characterization by XRD showed that all the nanoparticles are crystalline except for the 80 ºC samples after 1 h of reaction. The diffractograms for the Fe3O4/PANI samples treated at 60 °C showed a shift of the characteristic peaks indicating a magnetite/maghemite/magnetite transformation. A new crystalline phase was observed, which was indexed as hematite. On the other hand, there are not significant variations of the crystallite size for Fe3O4/PANI, whereas for the Fe2O3/PANI nanocomposites treated at 60 °C there is a slight increase in the crystallite size over time as well as with the increase in temperature. The TGA and DSC analysis showed that polymerization is favored by heat and reaction time. In addition, as expected by the model proposed by A. C. V de Araújo et al. [1], the polymerization for the Fe2O3/PANI nanocomposites is more accelerated than for Fe3O4/PANI.
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Huang, Kefan. "Shaping an Iconic Species : From the giant panda to the red panda and the Tibetan antelope". Thesis, Uppsala universitet, Institutionen för arkeologi och antik historia, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-413329.
Testo completoAbstract (sommario):
This thesis is based and developed on the ambiguous and open conception, iconic species, which reveals the relationship between human society and non-human species that goes be- yond its biological status. From the case of the giant panda, I attempt to deconstruct the shap- ing process of an iconic species from multiple perspectives, which includes how a specific cultural context, or a specific historical period contributes to the shaping process and how the government and the public diverge or even clash around the shaping process. Then, I introduce my fieldwork where I through observing both giant pandas and red pandas in the exhibition centres called panda bases to analyse the encountering an iconic species in reality and their different influences on public awareness of the wildlife conservation. I also attempt to explore the various representative forms of an iconic species such as the Tibetan antelope ranging from the mascot to the film and follow the changes of its symbolic meanings in different forms. In conclusion, the thesis is aimed to reflect the hybrid features of the iconic species and pro- vide in-depth interpretation of the endless interactions between the human beings and other species.
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Kelling, Angela S. "Simple visual discrimination training of the giant panda (Ailuropoda melanoleuca)". Thesis, Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04072004-180031/unrestricted/kelling%5Fangela%5Fs%5F200312%5Fms.pdf.
Testo completo
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ANDRADE, Gilson Ferreira de. "Estudo de revestimentos orgânicos contendo pigmentos Pani-ADBS e Pani-Fe3O4 para prevenção de corrosão". Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/18007.
Testo completoAbstract (sommario):
Submitted by Irene Nascimento (irene.kessia@ufpe.br) on 2016-10-18T18:14:55Z
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Tese_Final2016_VersaoDigital.pdf: 7557339 bytes, checksum: a22206b5f13175a64f4d1634bc9f3fc4 (MD5)Made available in DSpace on 2016-10-18T18:14:55Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Tese_Final2016_VersaoDigital.pdf: 7557339 bytes, checksum: a22206b5f13175a64f4d1634bc9f3fc4 (MD5) Previous issue date: 2016-06-08
O presente trabalho trata da obtenção de tinta utilizando dois pigmentos em dois vernizes diferentes (Epóxi–Ep e Poliuretana–PU) e dos testes de eficiência dessas tintas para prevenção da corrosão em aços. Um pigmento a base de Polianilina (Pani) na presença do ácido dodecilbenzeno sulfônico (ADBS) e o outro a base do compósito Pani-Fe3O4. A Pani sintetizada quimicamente foi secada a vácuo e caracterizada pelas técnicas de espectroscopia de Infravermelho e de UV/Vis. As placas de aço carbono SAE 1006 com e sem revestimentos foram submetidas a ensaio cíclico de corrosão em uma câmara de névoa salina (CNS). O monitoramento da corrosão foi feito por análises de fotografia e microscopia óptica. A interação camada-substrato foi investigada por meio da espectroscopia de impedância eletroquímica (EIE) e a superfície dos revestimentos por Espectroscopia Raman. No geral, os resultados indicaram que a Pani-ADBS teve maior desempenho no verniz Ep do que no verniz PU, enquanto o pigmento Pani-Fe3O4 apresentou maior desempenho no verniz PU. Existe evidência de que a Pani-ADBS adicionada ao Ep, na concentração de 0,1%, resulta em melhor proteção do aço ao final do ensaio de 30 dias. O indicativo pode ser visto pela maior resistência (3,95 x 109 ·cm2) e menor capacitância (7,14 x 10-11 F·cm-2). Discussão similar também pode ser feita com o revestimento PU, uma vez que ele apresentou maior resistência da camada (9,81 x 108 ·cm2) e menor capacitância (8,06 x 10-11 F·cm-2). Essa evidência também foi observada pelos resultados de potencial de circuito aberto (Eca). O espalhamento Raman detectou indícios de degradação química dos revestimentos Ep e PU. Baseado nos resultados obtidos neste trabalho é razoável a utilização do modelo ácido-base para explicar o mecanismo de proteção do aço pelos pigmentos Pani-ADBS e Pani-Fe3O4. O mecanismo de proteção do aço ainda carece de mais estudos, entretanto os resultados de potencial de circuito aberto e impedância eletroquímica sugerem que o mecanismo de proteção pode ser explicado por barreira física e em termos de compatibilidade entre o pigmento e a matriz polimérica.
This work describes the production of paints using two pigments in two different polymer matrices (epoxy-Ep and polyurethane-PU) and tests efficiency of these formulations in the prevention of corrosion in steel. A Polyaniline (Pani) based pigment in the presence of a functionalized protonic acid, known as dodecylbenzene sulfonic acid (DBSA) and the other based on Pani-Fe3O4 composite. The chemically synthesized Pani powder was vacuum-dried and characterized by infrared spectroscopy and UV/Vis. The paints were applied to metallic carbon steel SAE 1006 plates. The plates were subjected to cyclic corrosion essay to test the performance of the coatings against corrosion. The film-substrate interaction was investigated by electrochemical impedance spectroscopy (EIS). Raman spectroscopy was used for chemical analysis of surface coatings. It was observed that the Pani-DBSA had its most pronounced effect on the epoxy varnish than in the polyurethane varnish. While the pigment Pani-Fe3O4 showed better performance in the polyurethane varnish. There is evidence that PANI-DBSA added to the Ep at a concentration of 0.1% results in better protection of steel at the end of the 30 day test. This indication can be seen by the increased resistance (3.95 x 109 ·cm2) and a lower capacitance (7.14 x 10-11 F·cm-2). Similar discussion can also be done with the PU coating, as it showed the highest resistance (9.81 x 108 ·cm2) and a lower capacitance (8.06 x 10-11 F·cm-2). These results were confirmed by open circuit the potential (Eoc). The Raman scattering detected chemical evidence of Ep and PU coatings degradation. According to the results obtained in this study, it is reasonable to use the acid-base model to explain the steel protective mechanism by Pani-DBSA and Pani-Fe3O4 pigments. The steel protection mechanism still needs more studies; however, the results of open circuit potential and electrochemical impedance suggest that the protection mechanism can be explained by a physical barrier and in terms of polarity between pigment and matrix.
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Nyberg, Jakob. "Panda Cloud System Management Stjärna Fyrkant Umeå". Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-105411.
Testo completoAbstract (sommario):
Panda Cloud Systems Management (PCSM) is a cloud-based system for monitoring, inventorying and managing computers, servers and networks. Stjarna Fyrkant started its IT-department in August 2014 where they manage for Stjarna Fyrkants computers and networks but also other companies as IT consultants. They have chosen to use PCSM to manage and to monitor these networks. The project was started because Stjarna Fyrkant wants a better insight of the system as they have gone through with the basics of it. They have chosen four areas where they wants to know more about and these are monitoring of computers and servers, SNMP for monitoring other equipment, automated processes such as updating programs and Windows automatically and for Mobile Management (MDM) to manage and monitor iPhones. To make this happen I was given login information to PCSM, two computers and an iPhone to test PCSM and its other functionalities for what Stjarna Fyrkant want to accomplish. For monitors the report will go through about which monitor that exists in the store and in PCSM and later assign these to two groups for monitoring the servers and clients. Then how to monitor other devices via SNMP and how this was applied to the devices that Stjarna Fyrkant has, such as printers. However, this didn’t work for all devices. For maintenance of computers the report analyzes how to keep important updates for programs like Java and .NET but also for Windows. Additionally it was looked into how to remove unnecessary files found on the computers, such as the temporary files. For MDM the report looks in to which functionalities that exists and these were later tested for an iPhone. These functions worked surprisingly fast when it took only a few seconds for them to apply. There were plans to create a product sheet for companies of these features, but this was handed to someone else with more knowledge for design such towards companies.
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Serneguet, Sorli Alvaro. "A multichannel digitizer for the PANDA experiment". Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-229578.
Testo completoAbstract (sommario):
The PANDA Experiment will be one of the future experiments at the Facility for Antiproton and ion Research (FAIR), at Darmstadt, Germany. In the experiment, a stream of frozen hydrogen pellets will traverse vertically an antiproton beam circulating in the accelerator. Collisions of antiproton projectiles with frozen hydrogen pellets will lead to the generation of new particles, which in turn will be measured in the PANDA detector facility. The aim of this thesis is to develop a readout firmware for an ADC (Analog to Digital Converter) prototype, which will be used in the PANDA detector to gather all the necessary information from the antiproton-proton collisions. The firmware takes out interesting parameters of the pulse produced by the collision like amplitude, integral, pedestal or arrival time. The work will include algorithms for pulse recognition, data buffering, data formatting and readout using a Gigabit Transceiver (GTP). Big efforts have been put to achieve a very efficient utilization of the resources and to minimize the latency.
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Yu-Shan, Chevez Abril Victoria. "Response of Flooded Asphalt Pavement using PANDA". Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/96521.
Testo completoAbstract (sommario):
Moisture damage is one of the major causes of deterioration of pavements. An example is the damage caused by flooding. While the effects of pore water pressure in pavement have been studied using finite element modeling, few of the models consider a realistic moving tire and the viscoelastic behavior of the asphalt layer. Consequently, a three-dimensional finite element simulation based on Biot consolidation theory and Schapery's non-linear viscoelasticity model, was developed to accurately simulate and analyze the detrimental effects of saturated layers in asphalt pavements. In addition, a parametric study is conducted to analyze the response of pavements with varying surface and base thickness, base and subgrade permeability, and vehicle speeds under different level of saturation. The results indicate that the effects of pore water pressure be considered in the design of pavements in flood-prone areas and in the proposal of flood management plans. Ultimately, the implementation of a "flood resilient" asphalt pavement could be effective in reducing the cost of road restoration and repair in flood-prone areas.Master of Science
Moisture damage is one of the major causes of deterioration of pavements. An example is the damage caused by flooding. While the effects of pore water pressure in pavement have been studied using finite element modeling, few of the models have accurately modeled the behavior of the asphalt concrete and have not considered the realistic loading conditions. Consequently, a three-dimensional finite element simulation was developed to accurately simulate and analyze the detrimental effects of saturated layers in asphalt pavements. In addition, a parametric study is conducted to analyze the response of pavements with varying surface and base thickness, base and subgrade permeability, and vehicle speeds under different level of saturation. The results indicate that the effects of pore water pressure be considered in the design of pavements in flood-prone areas and in the proposal of flood management plans. Ultimately, the implementation of a "flood resilient" asphalt pavement could be effective in reducing the cost of road restoration and repair in flood-prone areas.
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Ma, Binsong. "Simulation of electromagnetic channels for PANDA@FAIR". Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112234/document.
Testo completoAbstract (sommario):
Le multi-détecteur PANDA (antiProton ANnihilation at DArmstadt) équipera l’anneau de stockage d’antiprotons du complexe d’accélérateurs FAIR (Facility for Antiproton and Ion Research), en construction à Darmstadt et dont les premiers faisceaux sont prévus en 2019. L’expérience cible fixe PANDA est un outil du futur pour la physique hadronique. Avec PANDA, on peut étudier par exemple la spectroscopie des mésons, rechercher de nouveaux états de la matière, comme les boules de glue et les hybrides, étudier la spectroscopie des baryons charmés et multi-étranges, les hypernoyaux, les hadrons dans la matière nucléaire. Les réactions d’annihilation antiproton-proton permettent aussi d’étudier la structure du nucléon, en particulier en utilisant les canaux électromagnétiques de production de paires électron-positron, qui constituent l’objet d’étude de cette thèse. Un problème majeur de l’étude des canaux électromagnétiques, est le bruit de fond hadronique, qui est au moins six ordres de grandeur plus grand que le signal et qui nécessite une excellente identification de particules et une bonne résolution en impulsion. Or, la reconstruction de l’impulsion des électrons et positrons est dégradée par l’émission de photons de Bremsstrahlung le long de leur trace. Dans la première partie de la thèse, j’ai étudié ce problème et développé une méthode, basée sur une correction de l’impulsion des électrons et positrons événement par événement, en utilisant la détection des photons de Bremsstrahlung dans le calorimètre électromagnétique. Cette méthode, qui a été intégrée dans le code de reconstruction officiel de PANDA, PANDAroot, permet une amélioration très significative de la résolution en impulsion des électrons dont peuvent bénéficier toutes les études de canaux de production de paires électron-positron.Dans la deuxième partie, j’ai effectué une étude de faisabilité de la mesure de la réaction antiproton proton → J/Ψ π⁰ dans un modèle utilisant des TDAs (Transition Distribution Amplitudes) pion-nucléon. Les TDAs sont des objets non-perturbatifs qui décrivent la transition entre deux particules différentes. Par exemple, les TDAs pion-nucléon donnent des informations sur les composantes pioniques dans la fonction d’onde du nucléon. Pour cette étude, j’ai utilisé le modèle de TDA pour créer un générateur d’événements, puis j’ai étudié les capacités de réjection du bruit de fond hadronique. L’amélioration de l’efficacité du signal, due à la méthode de correction de Bremsstrahlung a pu aussi être quantifiée. Cette étude pourra être utilisée pour une proposition d’expérience pour PANDAThe multi-purpose detector PANDA (antiProton Annihilation at Darmstadt) will be built at the antiproton storage ring of the FAIR accelerator complex that is under construction in Darmstadt and is expected to provide its first beam in 2019. The fixed target experiment PANDA is a state of the art hadronic physics detector. With PANDA, one can explore a wide range of topics including meson spectroscopy, search for new states of matter such as glue balls and hybrids, charmed and multi-strange baryon spectroscopy, hyper-nuclei, and properties of hadrons in nuclei. Proton antiproton annihilation reactions will also allow to study the structure of nucleons, in particular by exploiting the electromagnetic channel of electron-positron pair production which is the subject of this thesis.One major problem with studies of electromagnetic channels is the hadronic background with cross-sections at least six orders of magnitude larger than the signal, requiring excellent particle identification and good momentum resolution. However the momentum reconstruction for electrons and positrons is degraded due to the emission of Bremsstrahlung photons along their path. In the first part of this thesis, I studied this problem and developed a method based on the correction of the momentum of electrons and positrons event by event, using Bremsstrahlung photons detected in the electromagnetic calorimeter. This method, which has been integrated into PANDAroot, the official PANDA reconstruction code, provides a significant improvement of momentum resolution for electrons, and will be exploitable by any measurement with electron-positron pair in the exit channel.In the second part, I performed a feasibility study of measuring the reaction antiproton p →J/Ψ π⁰ using predictions from a model based on pion-nucleon TDAs (Transition Distribution Amplitudes). TDAs are non-perturbative objects that describe the transition between two particles of different nature. For example, pion-nucleon TDAs contain information about the pionic components in the nucleon's wave function. For this study, I relied on the TDA model to create an event generator, and studied the capability to reject hadronic background. The improvement of the efficiency for the signal due to the Bremsstrahlung correction method was quantified. This study can be used as basis for a proposal of an experiment with PANDA
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Lyon, Lauren M. "Niche Modeling for the Giant Panda, Ailuropoda melanoleuca, and the Original Panda, Ailurus fulgens: Habitat Preferences and Evolutionary Consequences". Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etd/3234.
Testo completoAbstract (sommario):
The well-known symbol for conservation, the giant panda bear, and the original red panda have been forced into remote habitats due to anthropogenic disturbance, making ecological study difficult. Therefore the first known species distribution model was created to predict the most likely areas of occurrence within the known range of these elusive animals. These models were then projected onto North America and evaluated against existing breeding programs. Additionally, the close proximity of the Gray Fossil Site and the discovery of the most complete fossil red panda specimens in the world allowed ecomorphological comparisons between the modern red panda, Ailurus fulgens and the fossil red panda, Pristinailurus bristoli. Spatial data and morphometric results from this study will aid conservation work and breeding programs globally.
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Jahuira, Huarcaya Viviana Rita. "Actividad antitusiva del extracto acuoso liofilizado de flores de Cosmos peucedanifolius Wedd. (Panti panti) en cobayos, investigación toxicológica en ratones". Doctoral thesis, Universidad Nacional Mayor de San Marcos, 2010. https://hdl.handle.net/20.500.12672/15138.
Testo completoAbstract (sommario):
Identifica los metabolismos secundarios del extracto acuoso liofilizado de las flores de Cosmos peucedanifolius Wedd (panti panti), demuestra la actividad antitusiva, vía oral en Cavia porcellus –cobayos; evalúa toxicidad aguda; subcrónica y análisis histopatológico en órganos del ratón, a fin de determinar su inocuidad. El estudio fitoquímico del extracto acuoso liofilizado de las flores de Cosmos peucedanifolius Wedd se realizó mediante la marcha fitoquímica según O. Lock, 1994, encontrándose metabolitos secundarios como flavonoides, compuestos fenólicos, taninos, alcaloides, saponinas, esteroides, triterpénicos, lactonas sesquiterpénicas, glúcidos, y aminoácidos. Luego, se efectuó la separación de los metabolitos secundarios predominantes en cromatografía de capa fina utilizando diferentes solventes orgánicos y se elucidó las estructuras químicas por espectrofotometría UV-visible, como resultado se determinaron presencia de flavonas. La actividad antitusiva del extracto acuoso liofilizado de Cosmos peucedanifolius Wedd se evaluó a través del método de Ulcelay et al. (1991). Se observó que con dosis de 1000mg/kg produjo una reducción de eventos tusivos 84,6% mayor que la codeína fosfato cuya dosis de 10mg/kg produjo 74,6% de inhibición de toses. Por otro lado, la aplicación de las dosis de 500 y 250mg/kg condujo a inhibiciones de 58.1%, y 50,1% los cuales resultan ser mayores a la aplicación del control negativo (suero fisiológico a 5mL/kg) cuya acción apenas llega a 32.8%. La evaluación de la toxicidad aguda en ratones realizada por el método de la clase toxica aguda 423, a las dosis de 25, 200 y 2000mg/kg, el análisis de leucocitos con coloración Wright y el estudio histopatológico por el método Hematoxilina - Eosina no mostró toxicidad aguda. Finalmente, se evalúo toxicidad subcrónica a las dosis de 250, 500 y 1000mg/kg. con el método dosis repetida 90 días 408 OECD, como resultado no se evidenció alteraciones histopatológicas por lo tanto no presentó toxicidad subcrónica. En conclusión el extracto acuoso liofilizado de las flores de Cosmos peucedanifolius Wedd mostró contenido de flavonas presumiendo sean responsables de la actividad antitusiva, con respecto a la toxicidad aguda y subcrónica no se evidenciaron ni acompañaron signos de algún grado de toxicidad.Tesis
14
Perdue, Bonnie Marie. "Spatial memory recall in the giant panda (ailuropoda melanoleuca)". Thesis, Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26482.
Testo completoAbstract (sommario):
The giant panda (Ailuropoda melanoleuca) is an endangered species and many efforts are being made to ensure its survival, including numerous research studies. However, there has been little investigation of spatial memory in the giant panda. Spatial memory is an important mechanism for survival in the wild, allowing an animal to find and remember the location of food, mates, den sites and avoid predators. Memory assessment in non-human species typically involves the use of recognition, as opposed to recall tasks. The current study tested spatial memory recall in 1.1 giant pandas using a delayed response memory task. The design required a delayed response to a previously lighted location, with varying lengths of delay between the observation phase and the test phase. The male subject reached criterion at 2-, 3-, 4-, 5-, 6-, and 10-second delays. The female subject reached criterion at 2-, 3-, 4-, 5-, 6-, 10-, and 15-second delays. The results support the hypothesis that giant pandas have working memory recall ability for spatial location.
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FERREIRA, Ana Linda Tiago Soares. "Imobilização de Beta Galactosidase em Sephadex-Pani". Universidade Federal de Pernambuco, 2009. https://repositorio.ufpe.br/handle/123456789/17473.
Testo completoAbstract (sommario):
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CAPES
A β-Galactosidase de Aspergillus oryzae foi imobilizada covalentemente em Sephadex G-50 revestido com polianilina (Sephadex-PANI), via glutaraldeído e disposta em coluna vertical (2cm x 10 cm). A microscopia eletrônica de varredura e a analise elementar mostrou a superfície rugosa das pérolas do Sephadex alteradas e a presença de nitrogênio respectivamente após o revestimento com PANI. O fluxo da coluna foi testado (0,125-1,25 mL min-1) e 0,8 mL min-1 foi estabelecido como sendo a melhor condição. A atividade da coluna do derivado enzimático (Sephadex-PANI-β-Galactosidase) foi realizada circulando na coluna uma solução de ortho-nitrophenyl-β-galactoside (ONPG; 3 mL) a um fluxo de 0,8 mL min-1 e o derivado enzimático (Sephadex-PANI-β-Galactosidase) apresentou um pH ótimo (4,5) e temperatura ótima (50 °C) semelhante ao da enzima livre. A quantidade de enzima imobilizada e a retenção específica de atividade enzimática comparada com a enzima solúvel foram 100% e 90%, respectivamente. O derivado enzimático foi reutilizado 10 vezes retendo cerca de 100% da atividade inicial e armazenado por aproximadamente dois anos mantendo 90% da sua atividade. A lactose do leite foi parcialmente convertida em glicose e galactose ao ser circulado na coluna de Sephadex-PANI-β-Galactosidase. Assim, a coluna do derivado enzimático (Sephadex-PANI-β-Galactosidase) pode ser proposta para a remoção contínua de lactose do leite. Futuramente, outras enzimas poderão ser covalentemente imobilizadas em colunas de Sephaedx-PANI e usadas em aplicações biotecnológicas.
β-Galactosidase from Aspergillus oryzae was covalently immobilized onto Sephadex G-50 coated with polyaniline (Sephadex-PANI), via glutaraldehyde, and arranged in a vertical column. The scanning electron microscopy and elemental analyses showed the rugose surface of the Sephadex beads altered and the presence of nitrogen, respectively, after PANI coating. The activity of the Sephadex-PANI-β-Galactosidase column (2cm x 10 cm) was assayed by circulating a solution of ortho-nitrophenyl-β-galactoside (ONPG; 3 mL) at a flow rate of 0.8 mL min-1 and its optima pH and temperature were found to be 4.5 and 50 °C, respectively, similar to those estimated for the free enzyme. The amount of immobilized protein and retention of specific enzymatic activity compared with the free enzyme were 100% and 90%, respectively. The enzymatic column was reused 10-times retainning about 100% of its initial activity. When stored for almost two years the derivative retained about 90% of its initial activity. Milk lactose was partially converted to glucose and galactose by circulating it through the Sephadex-PANI-β-Galactosidase column. Therefore, column of Sephadex-PANI-β-Galactosidase can be proposed for the continuos remotion of lactose from milk. Furthermore, other enzymes can be covalently immobilized on Sephaedx-PANI column and applied in biotechnology.
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Benz-Navarrete, Miguel-Angel. "Mesures dynamiques lors du battage du pénétromètre PANDA 2". Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2009. http://tel.archives-ouvertes.fr/tel-00725564.
Testo completoAbstract (sommario):
Par le caractère hétérogène des sols présents en surface, le dimensionnement et la construction de fondations demandent une bonne connaissance du comportement mécanique du sol et de sa variabilité spatiale. Les essais in-situ constituent dans ce domaine des outils précieux et parmi eux, les plus couramment utilisés à travers le monde, les pénétromètres dynamiques représentent une part prépondérante. Toutefois, ils ne permettent d'obtenir que quelques informations sur le sol, plus particulièrement la résistance de pointe. Par ailleurs, la réduction importante en taille et en coût des capteurs et de l'instrumentation associée permet à l'heure actuelle de mesurer des phénomènes physiques ayant lieu dans des conditions de travail singulières, inconcevables il y a quelques années. C'est dans cette esprit qu'a été développé ce travail à partir de l'essai de pénétration dynamique Panda. L'objectif de ce travail étant de concevoir et de développer de manière simple et économique un pénétromètre dynamique équipé de différents capteurs permettant d'une part d'obtenir la résistance de pointe et d'autre part de déterminer des paramètres supplémentaires gouvernant le comportement en déformation du sol mis en jeu pendant l'enfoncement du cône. Pour ce faire nous avons retenu une méthodologie de travail pluridisciplinaire : analytique, expérimentale et numérique MED.
17
Kliemt, Ralf [Verfasser]. "Simulations with the Panda Micro-Vertex-Detector / Ralf Kliemt". Bonn : Universitäts- und Landesbibliothek Bonn, 2014. http://d-nb.info/1077387008/34.
Testo completo
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Thomé, Erik. "Multi-Strange and Charmed Antihyperon-Hyperon Physics for PANDA". Doctoral thesis, Uppsala universitet, Kärnfysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-182450.
Testo completoAbstract (sommario):
The prospects of studying multi-strange and charmed antihyperon-hyperon physics and CP violation in hyperon decays in the upcoming PANDA experiment at FAIR, Germany, have been studied in this thesis. The angular dependence on polarisation parameters in the decay of the spin 3/2 Omega hyperon was calculated using the density matrix formalism. Expressions for the angular distributions in the Ω -> ΛK and the subsequent Λ -> pπ decays were derived. Simulations were performed for the pbar p -> Ξ+ Ξ-, pbar p -> Ω+Ω- and pbar p -> Λc-Λc+ reactions. Special attention was given to the reconstruction of spin variables. It is shown that PANDA will register tens of events per second for the pbar p -> Ξ+Ξ- reaction. This should be compared to the previously existing data of a handfull of events. For the other two reactions the event rates will be lower, but still reasonably high. This will be the first measurements of these reactions. It is shown that spin variables can be reconstructed in all three reactions for all production angles of the hyperons. Simulations concerning the possibility to measure CP violation parameters in hyperon decays were also made for the reactions pbar p- > Λbar Λ and pbar p -> Ξ+Ξ-. It was found that false signals from detector asymmetries disappears if no particle identification criterium is used and the analysis is restricted to events were the hyperon decays occur close to the beam axis. The effect of the magnetic field in the PANDA detector on the measurement of hyperon spin variables was investigated for the case of pbar p -> Λbar Λ. The effect was observed to be small for polarisation and negligible for spin correlations.
19
Panda, Emila [Verfasser]. "The initial oxidation of Al-Mg alloys / Emila Panda". Stuttgart : Max-Planck-Inst. für Metallforschung, 2009. http://d-nb.info/1000621103/34.
Testo completo
20
Kliemt, Ralf [Verfasser]. "Simulations with the Panda Micro-Vertex-Detector / Ralf Kliemt". Bonn : Universitäts- und Landesbibliothek Bonn, 2013. http://d-nb.info/1045276472/34.
Testo completo
21
Benz-Navarrete, Miguel Angel. "Mesures dynamiques lors du battage du pénétromètre PANDA 2". Clermont-Ferrand 2, 2009. http://www.theses.fr/2009CLF21930.
Testo completoAbstract (sommario):
Par le caractère hétérogène des sols présents en surface, le dimensionnement et la construction de fondations demandent une bonne connaissance du comportement mécanique du sol et de sa variabilité spatiale. Les essais in-situ constituent dans ce domaine des outils précieux et parmi eux, les plus couramment utilisés à travers le monde, les pénétromètres dynamiques représentent une part prépondérante. Toutefois, ils ne permettent d'obtenir que quelques informations sur le sol, plus particulièrement la résistance de pointe. Par ailleurs, la réduction importante en taille et en coût des capteurs et de l'instrumentation associée permet à l'heure actuelle de mesurer des phénomènes physiques ayant lieu dans des conditions de travail singulières, inconcevables il y a quelques années. C'est dans cette esprit qu'a été développé ce travail à partir de l'essai de pénétration dynamique Panda. L'objectif de ce travail étant de concevoir et de développer de manière simple et économique un pénétromètre dynamique équipé de différents capteurs permettant d'une part d'obtenir la résistance de pointe et d'autre part de déterminer des paramètres supplémentaires gouvernant le comportement en déformation du sol mis en jeu pendant l'enfoncement du cône. Pour ce faire nous avons retenu une méthodologie de travail pluridisciplinaire : analytique, expérimentale et numérique MED
22
RINALDI, TERESA. ""Mettersi nei panni degli altri": dalle misure alle applicazioni". Doctoral thesis, Università Cattolica del Sacro Cuore, 2020. http://hdl.handle.net/10280/92534.
Testo completoAbstract (sommario):
Questa tesi approfondisce, da un punto di vista teorico e applicativo, l’analisi della capacità di “mettersi nei panni degli altri”definita come un costrutto life-span, si sviluppa dalla prima infanzia ma non smette di evolversi fino all’età adulta. La sua traiettoria evolutiva è legata al contesto, alle interazioni, alle esperienze e allo sviluppo cognitivo ed emotivo degli individui.
Dalla letteratura emerge come tale capacità sia spesso oggetto di sovrapposizioni concettuali con altri costrutti della psicologia dello sviluppo come la “Teoria della Mente" (Premack & Woodruff, 1978; Wimmer & Perner, 1985), detta anche "mindreading" (Baron-Cohen, Jolliffe, Mortimore & Robertson, 1997); il "perspective-taking" (Carpendale & Lewis, 2006; Moll & Meltzoff, 2011; Sullivan, Bennett, Carpenter & Lewis, 2008); la "funzione riflessiva" (Fonagy & Target, 1997); e la "mentalizzazione" (Fonagy, Bateman & Luyten, 2012). Grazie all’approfondimento di tali costrutti, si arriva a comprendere essi siano spesso declinati con il concetto di mentalizzazione, che viene analizzato nella sua evoluzione storica e in relazione ad altri costrutti come il legame di attaccamento (Bowlby, 1969) e la mind-mindedness (Meins, 2002). L’analisi del costrutto prosegue con la presentazione di tre lavori di ricerca che lo esplorano, da un punto di vista teorico (i primi due) e applicativo (il terzo), dalla sua massima evoluzione nell’età adulta fino al suo manifestarsi e potenziarsi in età evolutiva.
La prima ricerca si concentra sulla validazione italiana di una scala che misura l'affettività mentalizzata, un costrutto che integra nel processo di regolazione delle emozioni la mentalizzazione in età adulta. La seconda verifica come la capacità di "mettersi nei panni degli altri", consolidata in preadolescenza, si manifesta all'interno dei legami di attaccamento tra bambini e insegnanti e infine, il terzo lavoro studia se tale capacità possa essere migliorata nel contesto scolastico e avere un impatto sui costrutti relazionali e sociali legati al processo decisionale in campo economico, come l'equità, l'altruismo e la donazione.This thesis explores, from a theoretical and applicative perspective, the ability to "put oneself in the shoes of others", defined as a life-span construct, which develops from early childhood but does not stop evolving until adulthood. Its developmental trajectory is linked to the context, interactions, experiences and cognitive and emotional development of individuals. The literature shows how this capacity is often the subject of conceptual overlaps with other constructs of developmental psychology such as the "Theory of Mind" (Premack & Woodruff, 1978; Wimmer & Perner, 1985), also known as "mindreading" (Baron-Cohen, Jolliffe, Mortimore & Robertson, 1997); perspective-taking (Carpendale & Lewis, 2006; Moll & Meltzoff, 2011; Sullivan, Bennett, Carpenter & Lewis, 2008); the "reflective function" (Fonagy & Target, 1997); and "mentalisation" (Fonagy, Bateman & Luyten, 2012). Thanks to the in-depth study of these constructs, we come to understand that they are often declined with the concept of mentalisation, which is analysed in its historical evolution and in relation to other constructs such as the attachment bond (Bowlby, 1969) and mind-mindedness (Meins, 2002). The analysis of the construct continues with the presentation of three research works that explore it, from a theoretical point of view (the first two) and from an applicative point of view (the third), from its maximum evolution in adulthood to its manifestation and enhancement in developmental age. The first research focuses on the Italian validation of a scale measuring mentalized affectivity, a construct that integrates mentalization in adulthood into the process of emotion regulation. The second examines how the ability to "put oneself in the shoes of others", which is consolidated in preadolescence, manifests itself within the attachment bonds between children and teachers and finally, the third work studies whether this ability can be improved in the school context and have an impact on relational and social constructs linked to economic decision-making, such as fairness, altruism and donation.
23
RINALDI, TERESA. ""Mettersi nei panni degli altri": dalle misure alle applicazioni". Doctoral thesis, Università Cattolica del Sacro Cuore, 2020. http://hdl.handle.net/10280/92534.
Testo completoAbstract (sommario):
Questa tesi approfondisce, da un punto di vista teorico e applicativo, l’analisi della capacità di “mettersi nei panni degli altri”definita come un costrutto life-span, si sviluppa dalla prima infanzia ma non smette di evolversi fino all’età adulta. La sua traiettoria evolutiva è legata al contesto, alle interazioni, alle esperienze e allo sviluppo cognitivo ed emotivo degli individui.
Dalla letteratura emerge come tale capacità sia spesso oggetto di sovrapposizioni concettuali con altri costrutti della psicologia dello sviluppo come la “Teoria della Mente" (Premack & Woodruff, 1978; Wimmer & Perner, 1985), detta anche "mindreading" (Baron-Cohen, Jolliffe, Mortimore & Robertson, 1997); il "perspective-taking" (Carpendale & Lewis, 2006; Moll & Meltzoff, 2011; Sullivan, Bennett, Carpenter & Lewis, 2008); la "funzione riflessiva" (Fonagy & Target, 1997); e la "mentalizzazione" (Fonagy, Bateman & Luyten, 2012). Grazie all’approfondimento di tali costrutti, si arriva a comprendere essi siano spesso declinati con il concetto di mentalizzazione, che viene analizzato nella sua evoluzione storica e in relazione ad altri costrutti come il legame di attaccamento (Bowlby, 1969) e la mind-mindedness (Meins, 2002). L’analisi del costrutto prosegue con la presentazione di tre lavori di ricerca che lo esplorano, da un punto di vista teorico (i primi due) e applicativo (il terzo), dalla sua massima evoluzione nell’età adulta fino al suo manifestarsi e potenziarsi in età evolutiva.
La prima ricerca si concentra sulla validazione italiana di una scala che misura l'affettività mentalizzata, un costrutto che integra nel processo di regolazione delle emozioni la mentalizzazione in età adulta. La seconda verifica come la capacità di "mettersi nei panni degli altri", consolidata in preadolescenza, si manifesta all'interno dei legami di attaccamento tra bambini e insegnanti e infine, il terzo lavoro studia se tale capacità possa essere migliorata nel contesto scolastico e avere un impatto sui costrutti relazionali e sociali legati al processo decisionale in campo economico, come l'equità, l'altruismo e la donazione.This thesis explores, from a theoretical and applicative perspective, the ability to "put oneself in the shoes of others", defined as a life-span construct, which develops from early childhood but does not stop evolving until adulthood. Its developmental trajectory is linked to the context, interactions, experiences and cognitive and emotional development of individuals. The literature shows how this capacity is often the subject of conceptual overlaps with other constructs of developmental psychology such as the "Theory of Mind" (Premack & Woodruff, 1978; Wimmer & Perner, 1985), also known as "mindreading" (Baron-Cohen, Jolliffe, Mortimore & Robertson, 1997); perspective-taking (Carpendale & Lewis, 2006; Moll & Meltzoff, 2011; Sullivan, Bennett, Carpenter & Lewis, 2008); the "reflective function" (Fonagy & Target, 1997); and "mentalisation" (Fonagy, Bateman & Luyten, 2012). Thanks to the in-depth study of these constructs, we come to understand that they are often declined with the concept of mentalisation, which is analysed in its historical evolution and in relation to other constructs such as the attachment bond (Bowlby, 1969) and mind-mindedness (Meins, 2002). The analysis of the construct continues with the presentation of three research works that explore it, from a theoretical point of view (the first two) and from an applicative point of view (the third), from its maximum evolution in adulthood to its manifestation and enhancement in developmental age. The first research focuses on the Italian validation of a scale measuring mentalized affectivity, a construct that integrates mentalization in adulthood into the process of emotion regulation. The second examines how the ability to "put oneself in the shoes of others", which is consolidated in preadolescence, manifests itself within the attachment bonds between children and teachers and finally, the third work studies whether this ability can be improved in the school context and have an impact on relational and social constructs linked to economic decision-making, such as fairness, altruism and donation.
24
Steinen, Marcell [Verfasser]. "Feasibility studies for the high precision X-ray spectroscopy of heavy Ξ− hyperatoms at PANDA using the PANda GErmanium Array PANGEA / Marcell Steinen". Mainz : Universitätsbibliothek Mainz, 2020. http://d-nb.info/1211846660/34.
Testo completo
25
Woolaway, Kathryn. "Internal translation initiation of Rhopalosiphum padi virus mRNA". Thesis, University of Surrey, 2002. http://epubs.surrey.ac.uk/843126/.
Testo completoAbstract (sommario):
Rhopalosiphum padi viras (RhPV) is one of several picorna-like viruses that infect insects; sequence analysis has revealed distinct differences between these agents and mammalian picornaviruses. RhPV has a single-stranded positive sense RNA genome of about 10kb; unlike the genomes of the Picornaviridae, however, this genome contains two long open reading frames (ORFs). ORF1 encodes the virus non- structural proteins, while ORF2 specifies the structural proteins. Both ORFs are preceeded by long untranslated regions (UTRs). The intergenic UTR is known to contain an internal ribosome entry site (IRES) that directs non-AUG-initiated, translation of ORF2. The 5' UTR of RhPV was assayed for IRES activity by translating synthetic bicistronic mRNAs containing this sequence in a variety of systems. The 5' UTR contains an IRES element that directs internal initiation of protein synthesis from an AUG codon in mammalian. Drosophila and plant in vitro systems and in vivo in an insect non-aphid cell line. In contrast, the encephalomyocarditis virus IRES only functions in mammalian in vitro and in vivo systems. The RhPV 5' IRES element has features in common with picornavirus IRES elements, in that no coding sequence is required for IRES function, but also with cellular IRES elements, as deletion analysis indicates that this IRES element does not have sharply defined boundaries. IRES activities of the 5' UTRs of other insect picorna-like viruses Acyrthosiphon pisum virus (APV) and the type 2 insect picorna-like virus Sacbrood viras (SBV) were also examined. Both viruses were shown to contain IRES elements that functioned in mammalian and plant in vitro systems and in vivo in an insect non-aphid cell line. Comparison of the IRES activities of RhPV with APV and SBV showed the RhPV 5' IRES element to be more efficient than both the APV and SBV IRES elements in mediating internal initiation of protein synthesis.
26
Cristovan, Fernando Henrique. "Preparação e caracterização de blendas de PANI/ABS". Universidade Federal de São Carlos, 2009. https://repositorio.ufscar.br/handle/ufscar/6116.
Testo completoAbstract (sommario):
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Polyaniline (PANI) chemical synthesis was monitored in situ by means of electrochemical impedance, open circuit potential (Voc) and mass variation. We verify that the final properties of the polymer could be practically defined after inflection point in the potential profile. The impedance data were decisive to understand this behavior, showing only a small change after inflection point. Impedance results and mass variations during the synthesis contributed to understand the induction mechanisms that occur in the initial stages of the polymerization process. Also, it was performed an investigation on the influence of different variables (temperature, monomer:oxidant molar ratio, oxidant, pH value, use of inert salts at high concentrations) in the PANI chemical synthesis process as well as in its physicochemical properties. In this work, it was estimated the characteristic points of PANI through the Voc measurements during the chemical synthesis, based on an experimental design methodology. This methodology allowed an efficient mapping of PANI synthesis process as well as its interactions with each variable previously described. The results indicated that the oxidant employed in the synthesis influences in the final chemical and physical properties of this polymer. The studies performed on the final properties of PANI were the degree of oxidation and electric resistivity. Moreover, the yield the degree of polymerization was also evaluated. The experimental design methodology was also used in order to understand the influence of the preparation conditions on the final properties of the blends in poly(acrylonitrile-butadiene-styrene) (ABS) and polyaniline obtained by the co-dissolving components in a common organic solvent. The variables evaluated were the PANI content in the blend, m-cresol:chloroform rate (solvent ratio), dopant (DBSA or CSA) and acrylonitrile content in the ABS. The results showed that these variables are able to change significantly the flexibility and electric conductivity of the blends. On the other hand, the dopant used mainly influences in the conductivity, suggesting that the DBSA is the better for the development of PANI/ABS blends more conductive. After better prepare conditions of the blends, the percolation threshold was established at around 3 wt% of PANI, forming a flexible blend with conductivity of approximately 3 S.cm-1. The optical properties of the blend films were characterized by UV Vis-NIR. The conduction mechanisms of the blends were investigated using a dc electric conductivity in the range from 80 to 320 K. Using the Mott s theory, it was found that the conductivity in the blends is a threedimensional variable range hopping mechanism. The Mott s temperature values, density of states at the Fermi energy, average hopping distance and barrier height for the blends were calculated and discussed in this work. Also, two possible technological applications were proposed to the PANI/ABS system, including: composite varistors and antistatic or electromagnetic protection of electronic devices. The varistors were prepared with 30% of PANI, which showed a low rupture voltage at around 10 V and a non linearity coefficient of approximately 9,2. On the paint shape and when deposited on cardboard, this material can be employed as protector system of electronic devices. Another important characteristic is the conductivity of this material, which is controlled by the number of paint layers deposited on the cardboard.
A síntese química da polianilina (PANI) foi monitorada in situ por meio das técnicas de impedância eletroquímica, potencial de circuito aberto (Voc) e variação de massa. Foi detectado que as propriedades finais do polímero são definidas logo após o do máximo da curva de Voc e antes do platô final. Os dados de impedância foram decisivos para o entendimento desta característica, apresentando somente uma pequena variação depois do máximo de Voc. Os dados de impedância e variação de massa durante a síntese também contribuíram para a compreensão dos processos que ocorrem durante o período de indução da síntese da PANI. Em seguida, foi feita uma investigação da influência das variáveis de síntese tais como: temperatura, razão monômero:oxidante, tipo de agente oxidante, pH e o uso de LiCl na síntese química da PANI, bem como nas propriedades físico-químicas do polímero obtido. Para avaliar as influências destas variáveis na síntese da PANI foi utilizada a técnica de Voc e para avaliar pontos característicos foi empregada a metodologia de planejamento fatorial. Esta técnica permitiu estabelecer um rápido e compreensivo mapeamento do processo de síntese da PANI, e a importância de cada variável bem como suas interações. A variável que mais influenciou em todos os estágios do processo foi tipo de agente oxidante. Depois, foram estudas as propriedades finais do polímero tais como grau de oxidação e resistividade elétricas. O rendimento de polimerização também foi avaliado, todas estas respostas também foram avaliadas utilizando um planejamento fatorial que, por sua vez, mostrou que a variável que mais influencia nas propriedades finais do polímero é o tipo de agente oxidante. Em um segundo momento, foram estudadas as influências das condições de preparo das blendas de PANI com o poli(acrilonitrila-butadieno-estireno) (ABS) preparadas pelo método de codissolução de ambos os componentes em um solvente comum através de um planejamento fatorial. As variáveis estudadas foram: quantidade de PANI nas blendas, razão m-cresol;clorofórmio, tipo de dopante (DBSA ou CSA), concentração de dopante e teor de acrilonitrila no ABS. As respostas monitoradas foram a flexibilidade e a condutividade elétrica das blendas obtidas. Os resultados mostraram que a quantidade de PANI nas blendas e o teor de acrilonitrila no ABS foram as variáveis que mais influenciaram em ambas as respostas. O tipo de dopante mostrou somente influência na resposta condutividade, onde o DBSA se mostrou o melhor dopante para se obter blendas de PANI/ABS mais condutoras. Depois das melhores condições de preparo estabelecidas, o limite de percolação do sistema foi determinado, onde o valor estimado foi de 3% em massa de PANI na blenda, apresentando uma condutividade de 3 S.cm-1. Para se compreender o mecanismo de condutividade das amostras, foi feito um estudo da condutividade DC das blendas no intervalo de temperatura de 80-320 K. Os dados foram tratados aplicando a teoria de Mott, onde o mecanismo de condutividade obedece ao modelo de Saltos de Tamanhos Variáveis em três dimensões, e os parâmetros de Mott foram estimados. Duas aplicações para o sistema PANI/ABS foram propostas. Onde preparados compósitos varistores de PANI/ABS, sendo que o material preparado com 30% de PANI apresentou uma tensão de ruptura de aproximadamente 10 V e um coeficiente de não linearidade de 9,2, com estes valores o compósito pode ser utilizado na proteção de equipamentos eletrônicos. Na outra aplicação proposta neste trabalho, foi preparada uma tinta de PANI-DBSA/ABS, que foi depositada sobre papelão, a resistência elétrica do material pode ser controlada pelo número de camadas de tinta. Deste modo o material pode ser utilizado na proteção antiestática e eletromagnética também de componentes eletrônico.
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Anderson, Clare. "Kala Pani : Indian convicts in Mauritius, 1815-1853". Thesis, University of Edinburgh, 1997. http://hdl.handle.net/1842/21268.
Testo completoAbstract (sommario):
Between 1815 and 1837 almost fifteen hundred Indian convicts were transported from the Presidencies of Bengal and Bombay and the colony of Ceylon to the Indian Ocean island of Mauritius. Transportation was then abandoned. After the convicts' arrival in Mauritius, they were put to work on various private and public works projects on the island. They were a crucial labour supply in important sectors of the rapidly expanding Mauritian economy. Above all they built and maintained the island's necessary infrastructure. This thesis begins with an analysis of the context in which a system of transportation was set up in the Indian Presidencies. It is shown that transportation was a 'humanist' penal strategy, given particular resonance in the South Asian region due to colonial perceptions of the significance of race and caste there. At the same time, transportation was implemented as an economic strategy. It removed relatively costly prisoners from the Indian jails and satisfied the demand for certain categories of labour in Mauritius, which could not easily be procured from among the island's existing workforce. Extensive analysis is then made of a highly original source: convict ship indents. It is clear that the convicts came from the margins of Indian society, comprising groups which had been placed under the most pressure by East India Company penetration into north India. The focus of the thesis then shifts to Mauritius and the operation of the convict system there. The main thrust of the remaining chapters is that although transportation was founded on 'disciplinary' principles, these were often far removed from the actual practices of convict management. The convicts' labour capacity was exploited, but this was sometimes challenged through convict resistance. Otherwise, there was a general lack of surveillance and control over the convicts which led to their widespread integration in Mauritian society - through cohabitation, religious activities, leisure and acquisition of private property - despite colonial directives to effect their social segregation. These conclusion lead to serious reservations about Foucauldian understandings of the matters addressed, which tend to totalise the effects of disciplinary and surveillance technologies.
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Nordhage, Örjan. "On a Hydrogen Pellet Target for Antiproton Physics with PANDA". Doctoral thesis, Uppsala University, Department of Nuclear and Particle Physics, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7137.
Testo completoAbstract (sommario):
The PANDA experiment is a part of the future FAIR accelerator facility and will study the strong interaction by detecting the reaction products from antiproton-proton annihilations in a near full solid-angle configuration. One option for the internal proton target in PANDA is frozen micro-spheres of hydrogen, so-called pellets.
Such a pellet target is interesting because of the unique characteristics it offers; the high target thickness, the small interaction volume, the minimal gas load on the vacuum system, and the possibility of tracking individual pellets. Nevertheless, it is possible to allocate the bulky equipment needed to produce the pellets at a few meters away from the beam. This way particle detectors can be located close and almost fully around the interaction point.
This thesis is devoted to the optimization of a pellet target. To perform measurements, a Pellet-Test Station was built at The Svedberg Laboratory, Uppsala. For the first time, experimental results show the pellet distribution in space and time, and in addition, the vacuum along the pellet pipes. Furthermore, dedicated measurements carried out at CELSIUS/WASA demonstrate the existence of pellet heating as a result of beam-target interactions.
In performing calculations, the potential problems with pellet heating at PANDA are outlined. Moreover, to look at the consequences for the desired physics, a reaction involving short-lived D-mesons has been used to show the advantages of pellets compared to a more spacious target.
In conclusion, these studies lead to a deeper understanding of the pellet properties, which makes it possible to suggest future improvements, such as cooling with no vibrations.
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Nordhage, Örjan. "On a hydrogen pellet target for antiproton physics with PANDA /". Uppsala : Acta Universitatis Upsaliensis, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7137.
Testo completo
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Löfgren, Johan. "Vacuum calculations for hydrogen pellet targets at WASA and PANDA". Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-222973.
Testo completoAbstract (sommario):
We have performed calculations in order to evaluate the vacuum conditions for the twohadron physics experiments WASA and PANDA. WASA is an ongoing experiment whereasPANDA is an experiment under construction. There is an interest in improving the vacuumconditions for these experiments in order to reduce background interactions. The experimentswere modelled as longitudinal conductance limited vacuum systems in the molecular flowregime and the calculations were performed with VAKLOOP. The approach was to fit amodel of WASA to measurement data and then extend this model to PANDA in order tomake predictions. The model of WASA was successful in the sense that it reproduced themeasurement data within the measurement uncertainty. The model of PANDA showed somediscrepancies in comparison with calculations from the Target Technical Design Report ofPANDA, but an overall similar pressure profile is obtained. Finally, we have considered a wayof improving the conditions at PANDA by including extra pumping capacity in the system,concluding that lowering the pressure at the interaction point for PANDA is challenging. Anoutlook for further modelling is to make a more detailed comparison between our model andthe one from the Target Technical Design Report.
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Potužáková, Karolína. "Změna v přístupech v SEO po updatech Penguin a Panda". Master's thesis, Vysoká škola ekonomická v Praze, 2014. http://www.nusl.cz/ntk/nusl-198614.
Testo completoAbstract (sommario):
Search engine algorithms are constantly improved in order to provide the highest quality and most relevant results for the user. Google algorithm updates called Panda and Penguin have recently been one of the most significant and many websites that use black hat SEO techniques were hit by them. Nowadays, using this search optimization's techniques raises the risk of Google penalty, which in most of the cases cause decrease in traffic from organic search. The aim of this thesis is to describe techniques of search engine optimization (SEO) and their possible impact on website's ranking. The thesis also aims to verify whether Penguin and Panda updates have the impact on websites for which the methods of black hat SEO have been used and specify the result of this impact. In the theoretical part of this thesis it is described function of search engines Seznam.cz and Google, their algorithm change in history and possible factors on which the ranking score is based. Briefly are also described tools, which can be used to identify and analyze possible causes of penalization. After reading this thesis, the reader will have a basic orientation in search engine optimization methods and their appropriate use. Also, he will be able to recognize possible causes of Google penalty and propose an appropriate strategy for its removal.
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Morisset, Natalie Carleton University Dissertation Geology. "Stableisotope and radioisotope geochemistry of the Panda Hill carbonatite, Tanzania". Ottawa, 1992.
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Pantaleoni, Marco <1995>. "Un ponte finanziario tra Italia e Cina: i Panda Bonds". Master's Degree Thesis, Università Ca' Foscari Venezia, 2019. http://hdl.handle.net/10579/16083.
Testo completoAbstract (sommario):
Negli ultimi anni, in Cina, è andata diffondendosi l'utilizzo di particolari strumenti finanziari obbligazionari: i Panda Bonds. Ultimamente, in seguito al memorandum firmato a marzo 2019 tra Italia e Cina, è stata portata all'attenzione della cronaca nazionale l'esistenza di tali strumenti. Infatti, con questo accordo, si prevede l'emissione da parte della Cassa Depositi e Prestiti di un quantitativo pari a 5 miliardi di renminbi di queste obbligazioni.
L'obiettivo di questa tesi è cercare di individuare i benefici che tale operazione finanziaria comporta e allo stesso tempo analizzare tutti i rischi che vengono assorbiti dall' istituzione finanziaria italiana (CDP) e che possono pesare sulla sua operatività di lungo periodo.
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Sun, Pei. "The Effect of Early Rearing Experience on Adult Reproductive Behavior in Captive Giant Pandas and Spectacled Bears". Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7618.
Testo completoAbstract (sommario):
The present study examined the relationship between early rearing experience and reproductive competence in captive adult giant pandas (Ailuropoda melanoleuca) and spectacled bears (Tremarctos ornatus). Life history information of 52 giant pandas and 34 spectacled bears were obtained from the International Studbook and by interviewing staff at institutions housing the subjects. The early rearing experience variables included duration of mother rearing, social access within 1-yr period following maternal separation, and birth origin. Correlation, Chi-square, and logistic regression analyses were used to analyze the data. Contrary to findings from studies with other animals, the results generally suggest that early rearing experience is not related to adult reproductive success in giant pandas and spectacled bears. Alternative explanation and limitation of the study were discussed; suggestions were made for future study.
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Tun, Hein Min. "Microbial community structure and function in the gut of giant panda (Ailuropoda melanoleuca)". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/197106.
Testo completoAbstract (sommario):
Giant pandas are unique animals because of their digestive system is similar to carnivores but they have in fact adapted to a plant diet with bamboo as their main food source. According to fossils records, giant pandas were omnivorous approximately 7 million years ago, becoming almost vegetarian after 4.6 to 5 million years of evolution. However, their genome and anatomical structure do not favor bamboo digestion. For more than a decade, researchers have been questioning the underlying mechanism of their ability to digest bamboo. In 2010, the genome of giant panda was completed, which confirmed that their genome had no gene encoding for cellulolytic enzymes. Thus, the gut microbiota of giant panda, which has been hypothesized to play a key role in bamboo digestion, has garnered unprecedented attention. Researchers are also interested in the giant panda’s gut microbes due to their potential application in biomass conversion.
In Chapters 2 and 3 of this thesis, the microbial catalog of the giant panda’s gut microbiota was characterized, showing possible age-related microbial dysbiosis. Moreover, the microbiota, both bacterial and fungal was highly individualized because very few operational taxonomic units were shared among the four pandas in this study. Novel homoacetogens were also identified in the giant panda using functional gene clone-library sequencing. Using metagenomic sequencing, I uncovered the first evidence of human and animal related viruses in the giant panda’s gut. In addition to the community structure, I also determined the metabolic pathways of the microbiome. From KEGG annotation, a metabolic pathway for both cellulose and hemicellulose metabolism was identified. Comparative metagenomic analysis indicated that the giant panda’s gut microbiome was taxonomically and functionally distinct from those in mammals.
In Chapters 4 and 5, a total of 97 species of bacteria were isolated and identified using biochemical assays. Four of these bacteria showed powerful cellulolytic and hemicellulolytic activities on solid media. The gram-positive bacteria (HKUOP_BS) and the gram-negative bacteria (HKUOP_A14) were found to be rod shaped, facultative anaerobes that had the ability to powerfully hydrolyze both cellulose and hemicellulose using intracellular and extracellular enzymes respectively.
In Chapter 6, I determined the complete genome of a cellulolytic bacterium, Klebsiella oxytoca HKUOPL1, from giant panda and further described the annotated virulence, drug resistant, functional and potential horizontal transferring genes. The phylogenomic tree indicated that K. oxytoca HKUOPL1 closely resembled the K. oxytoca KCTC 1686 strain commonly used in 2,3-butanediol production.
In captive giant pandas, a mucous excretion episode usually occurs with mild to severe colic. To understand the host-microbial interactions during this episode, bacterial communities were compared between mucous excreta and normal feces. The shifts in community abundance (especially flooding of Clostridia) may be associated with the mucous excretion episode.
This study provides a better understanding of the microbial community structure and function in the giant panda’s gut.published_or_final_version
Biological Sciences
Doctoral
Doctor of Philosophy
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Sandhaus, Estelle Ann. "Variation of Feeding Regimes: Effects on Giant Panda (Ailuropoda melanoleuca) Behavior". Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7617.
Testo completoAbstract (sommario):
Giant pandas in captivity are typically fed discrete amounts of highly concentrated food on a fixed time schedule, in addition to limited amounts of fresh bamboo throughout the day. In response to informal observations that these animals engage in a number of undesirable behaviors just prior to the predictable feeding of concentrated meals, we examined the existing feeding regime at the Research Base of Giant Panda Breeding in Chengdu, Peoples Republic of China. We sought to determine whether undesirable behaviors were occurring more frequently before the delivery of meals than at other times of day and whether modified feeding regimes would result in a more species-appropriate activity budget overall. As predicted, female giant pandas spent significantly more time engaged in door-directed/human-oriented behavior, stereotypic behavior, and non-stereotypic locomotion in the 30-minute periods prior to the feeding of concentrated meals. When placed on a modified feeding schedule in which frequency of bamboo provisioning was increased (total amount was held constant), significant differences were not found between study phases for the above-mentioned behaviors of interest, though a visual trend towards a decline in stereotypic behavior during the experimental phase was noted. Male pandas, when placed on a less predictable feeding schedule, did not exhibit significant behavioral differences in behaviors of interest between experimental phases or observation periods. These findings may be attributable in part to the low power inherent in the small sample size. However, visual trends that may be indicative of feeding anticipatory activity (FAA) were apparent. It appears that giant pandas, like many other animal species cited in the literature, are sensitive to periodic feeding regimes, though it is less clear as to which regime modifications will prove most beneficial.
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Snyder, Rebecca Jo. "A behavioral and hormonal study of giant Panda (Ailuropoda Melanoleuca) reproduction". Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/29528.
Testo completo
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Cowie, Euan Niall. "Development of a prototype for the novel disc DIRC for PANDA". Thesis, University of Glasgow, 2013. http://theses.gla.ac.uk/4334/.
Testo completoAbstract (sommario):
The PANDA experiment is a planned experiment for the FAIR upgrade to GSI in Darmstadt, Germany. It aims to probe the nature of hadronic matter and the Strong nuclear force to unprecedented levels of accuracy and precision. A general purpose detector, covering 4-Pi solid angle, will reside on the High Energy Storage Ring (HESR) racetrack-type accelerator. The HESR will provide a beam of variable momentum anti-Protons which impinge upon a proton target internal to the PANDA detector. To fulfil the physics programme the detector will utilise two Cherenkov detectors based on the Detection of Internally Reflection Cherenkov radiation (DIRC) principle, one in a barrel configuration and one in an disc configuration. A proposed design for the disc configuration DIRC is the Focussing Lightguide Disc DIRC(FLDD). In addition to the novel geometry the FLDD proposes to use a unique hardware element to correct for the chromatic dispersion present in DIRC detectors. Lithium Fluoride was selected to correct for this dispersion and was found to reduce the angular spread resulting by a factor of ~4.7, in agreement with the predicted reduction. A full optical simulation of a prototype accurately reproduced all of the features observed at test beam. Therefore to perform the Pion/Kaon separation required for the PANDA physics programme the design needs a detector surface split into 64 channels or a resolution of 0.78125mm per pixel. Further study of the focussing lightguide element is required to access the full performance of the FLDD design.
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Melo, Luciana de Oliveira. "Blendas condutoras a base de água para proteção à corrosão". Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/46/46132/tde-28032007-180524/.
Testo completoAbstract (sommario):
A obtenção de blendas condutoras a base de água, ainda é pouco explorada e apresenta uma interessante alternativa ao uso de compostos poluentes como os cromatos na proteção à corrosão metálica. Os polímeros condutores apresentam propriedades anti-corrosivas e podem ser processados em meio aquoso, eliminando o uso de solventes orgânicos altamente tóxicos e agressivos para o meio ambiente. O presente trabalho consiste no estudo da proteção da corrosão metálica por revestimento de filmes de blendas contendo Poli(anilina) (PANI). As blendas foram obtidas à partir da mistura de uma suspensão aquosa de PANI com uma dispersão aquosa de Poli(metil metacrilato). O uso de técnicas como potencial zeta, espalhamento de luz dinâmico, análise térmica e microscopia eletrônica de varredura permitiram a caracterização da mistura homogênea obtida. Medidas através do método da sonda de quatro pontas mostraram que as blendas apresentam condutividade mesmo com baixas quantidades de PANI e a técnica de espectroscopia Raman mostrou a presença da forma condutora deste polímero nos filmes das blendas. Técnicas como microscopia óptica, potencial a circuito aberto, voltametria linear e espectroscopia de impedância eletroquímica permitiram avaliar a proteção à corrosão de eletrodos metálicos de ferro, cobre e níquel recobertos com filmes das blendas de PANI em diferentes meios corrosivos. As blendas mostraram eficiência contra a corrosão e apresentam-se como um novo material não poluente para a proteção à corrosão metálica.The development of water-based conducting blends has not yet been very much explored and it presents itself as an interesting alternative to the use of polluting compounds such as chromates in the protection of metals from corrosion. The conducting polymers present anti-corrosion properties and can be processed in aqueous medium, eliminating the use of organic solvents, which are highly toxic and threatening to the environment. This thesis is based on the study of protection from metallic corrosion using poly(aniline) (PANI) coating blends. The blends have been obtained by mixing a PANI aqueous suspension with a poly(methyl metacrylate) aqueous dispersion. Techniques such as zeta potential, dynamic light scattering, thermal analysis and scanning electronic microscopy allowed the characterization of the homogeneous mixture obtained. Measurements carried out by the four-point probe method showed that the blends present conductivity even despite low PANI quantities. In addition, the Raman spectroscopy technique showed the presence of the conducting form of this polymer on the blend films. Techniques such as optical microscopy, open-circuit potential, linear voltammetry and impedance spectroscopy allowed the evaluation of the corrosion protection of the iron, copper, and nickel metallic electrodes coated with PANI blend films in different corrosives mediums. The blends showed efficiency against corrosion and they are therefore a new environmentally friendly material for metallic corrosion protection.
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Pagotto, Josias Falararo. "Métodos de proteção contra a corrosão de ligas metálicas". Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/75/75134/tde-24022014-111216/.
Testo completoAbstract (sommario):
Neste trabalho foram estudadas soldas TIG (Tungsten Inert Gas) nos aços inoxidáveis 304 e 316, e no aço carbono 1020. As alterações das microestruturas foram investigadas por microscopias óptica (MO) e eletrônica de varredura (MEV), enquanto que a corrosão destas regiões foi estudada por análises de polarização potenciodinâmica. Um sistema miniaturizado de análise corrosão, denominado sensor pontual de corrosão (SPC), foi utilizado com o objetivo de analisar a estreita região dos cordões de solda, estudando assim a influência da corrente de solda na corrosão desta região nos aços inoxidáveis 304 e 316. Os resultados mostraram que a alteração da estrutura cristalina na solda tornou esta região menos susceptível à corrosão que o material base, e o aumento da corrente de solda intensificou ainda mais este efeito, pela formação de estruturas mais compactas. No caso do aço carbono 1020 (mais susceptível à corrosão), o estudo da corrosão de sua solda foi feito utilizando técnicas eletroquímicas globais (potencial de circuito aberto, PCA, e espectroscopia de impedância eletroquímica, EIE) e técnicas de corrosão localizadas (espectroscopia de impedância eletroquímica localizada, EIEL, e técnica do eletrodo vibratório de varredura, TEVV). Para proteção contra a corrosão do aço inoxidável e suas soldas, foi utilizado um revestimento de polianilina (PAni) na forma de base esmeraldina; análises de polarização potenciodinâmica mostraram a eficiência deste revestimento protetor. Para o aço carbono 1020, devido à sua maior facilidade de oxidação, foi sintetizado um revestimento protetor a base de PAni e nanotubos de TiO2 (PAni/n-TiO2). As variáveis estudadas na síntese do polímero foram: temperatura de síntese, meio reacional, grau de dopagem do polímero (condutor ou isolante) e número de camadas. Os polímeros e compósitos foram caracterizados por espectroscopias nas regiões do ultravioleta-visível (UV-vis) e infravermelho (IV), MEV e espectroscopia de energia dispersiva de raios-X (EDX). Os aços recobertos com os filmes foram analisados por MO e MEV, EDX, e por ensaios eletroquímicos de polarização potenciodinâmica, PCA e resistência de polarização, além de ensaio de corrosão acelerada em câmara de névoa salina. As melhores condições encontradas foi para o revestimento de PAni/n-TiO2 desdopado (base esmeraldina) sintetizado a 25°C em meio de H2SO4, e com 3 camadas; o n-TiO2 apresentou um efeito de aumento da aderência do filme ao substrato metálico.In this work TIG (Tungsten Inert Gas) welds have been studied in the 304 and 316 stainless steels, and in the 1020 carbon steel. The changes in the microstructure were investigated by optical microscope (OM) and scanning electronic microscope (SEM), and the corrosion behavior in these zones were studied by potentiodynamic polarization analysis. A miniaturized corrosion analysis device, named corrosion punctual sensor, has been used to analyze the close weld bead, researching for the influence of the weld current in the corrosion process in this zone of the 304 and 316 stainless steels. The results showed that the change in the crystalline structure of the weld zone became this region less susceptible to corrosion process than their base material, and the increase in the weld current intensified this effect, by the formation of more compact structures. In the case of the 1020 carbon steel (more susceptible to corrosion processes), the corrosion in its weld zone was researched by global (like open potential circuit, OCP, and electrochemical impedance spectroscopy, EIS) and localized (like localized electrochemical impedance spectroscopy, LEIS, and scanning vibrating electrode technique, SVET) electrochemical techniques. For protecting stainless steels and their weld zones against corrosion processes, a polyaniline (PAni) coating in the emeraldine base form was used; potentiodynamic polarization analysis showed the efficiency of this protective coating. For the 1020 carbon steel, due to its mayor oxidation susceptibly, a protective coating of PAni and TiO2 nanotubes (PAni/n-TiO2) was synthesized. The variables researched were: synthesis temperature, reaction medium, degree of doping of the polymer (conductor or insulator) and number of layers. The polymers and composites were characterized by ultraviolet visible (UV-vis) and infrared spectroscopies, SEM and Energy Dispersive X-Ray Spectroscopy (EDX). The coated steels were analyzed by OM, MEV and EDX spectroscopies, and by potentiodynamic polarization, OCP and polarization resistance electrochemical measurements, besides accelerate corrosion tests in a salt spray chamber. The best conditions found for the dedoped PAni/n-TiO2 coatings (emeraldine base) were: temperature of synthesis of 25°C, H2SO4 as reaction medium, and with 3 layers; n-TiO2 has presented an effect of increasing the adherence of the coating with the steel.
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Jäkel, René. "Resolution Studies for the Micro Vertex Detector of the PANDA Experiment and the Reconstruction of Charmed Mesons for Specific Hadronic Channels". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-25497.
Testo completoAbstract (sommario):
The PANDA experiment is planned as part of the extended GSI facility FAIR to investigate hadronic reactions in antiproton-proton annihilations. An excellent beam quality and high luminosity is expected which allows the investigation of hadronic reactions such as the spectroscopy of the charmonium system. To ensure different studies of hadronic systems an universal detector is being designed, the PANDA detector. A high resolution Micro Vertex Detector (MVD), as part of the whole setup, is an important component of the track and vertex reconstruction. A mayor part of this work were simulation studies to investigate the resolution ability of the vertex detector. For this the development and implementation of reconstruction algorithms and their integration to the track and vertex reconstruction were an essential part to allow the detailed study of the resolution of the MVD and the whole apparatus under realistic assumptions. The track and vertex reconstruction ability of the detector is shown exemplarily for the channels antiproton-proton into two charged pions and into J/psi and photon. The expected hadronic background for physics observables requires a high selection power of the experimental setup, especially for the investigation of the charmonium system above the DD(bar) threshold. For this particular energy region no experimental data exist and the PANDA experiment can contribute to understand the binding of charmed mesonic systems. Charmonium states can decay to open-charm channels which provide a clear signature in the detector from the charged D-Meson decays. In this work the high selection ability of the experimental setup was investigated for two reaction channels. Under the assumption of an expected low reaction cross section the clear identification of the DD(bar) decay channel was shown, even for the presence of a huge hadronic background. This allows a clear identification of the DD(bar) decay channel and mayor background resources for this channel were discussedDas PANDA Experiment wird Teil der geplanten Ausbaustufe FAIR als Erweiterung zur GSI und wird die Untersuchung von hadronischen Reaktionen in Antiproton-Proton Annihilationen ermöglichen. Durch die zu erwartende exzellente Strahlqualität und hohe Luminosität ergeben sich vielfältige Möglichkeiten zur Untersuchung von Hadronenwechselwirkungen, wie beispielsweise die genaue Spektroskopie des Charmoniumsystems. Um vielfältige Untersuchungen verschiedenster hadronischer Systeme zu gewährleisten, wurde der Aufbau eines universellen Detektors geplant, des PANDA Detektors. Dazu ist ein hochauflösender Vertexdetektor (MVD) eine wichtige Komponente, um im Zusammenspiel mit weiteren Detektorkomponenten zur Spur- und Vertexrekonstruktion beitragen zu können. Im Rahmen dieser Arbeit wurden detaillierte Simulationen durchgeführt, die das Auflösungsvermögen des Vertexdetektors charakterisieren, ganz besonders im Hinblick auf die Rekonstruktion verschiedener physikalischer Kanäle. Dafür war die Entwicklung und Implementierung von Algorithmen zur Rekonstruktion der zu erwartenden Detektordaten und deren Integration in den Spurfit zur Teilchenrekonstruktion eine Grundvoraussetzung. Dadurch ist es möglich das Auflösungsvermögen des MVD und des gesamten experimentellen Aufbaus unter realistischen Bedingungen zu testen und zu optimieren. Die Spur- und Vertexrekonstruktion wird anhand der Kanäle Antiproton-Proton nach zwei geladenen Pionen und nach J/Psi Photon evaluiert. Der zu erwartende hadronische Untergrund stellt hohe Anforderungen an die Selektionskraft des experimentellen Aufbaus, bezüglich der physikalischen Observablen, dar. Dies ist besonders für die Untersuchung des Charmoniumsystems oberhalb der DD(quer)-Schwelle von Bedeutung, wofür kaum experimentelle Untersuchungen vorliegen und der PANDA Detektor zukünftig einen entscheidenden Beitrag zum Verständnis gebundener mesonischer Systeme beitragen kann. Zuständen im Charmoniumsystem ist es erlaubt in Open-Charm-Kanäle zu zerfallen, die eine eindeutige experimentelle Signatur mittels der D-Zerfälle in geladene Teilchen im Detektor erlauben. Im Rahmen dieser Arbeit konnte anhand zweier grundlegender Reaktionen gezeigt werden, dass selbst unter ungünstigen Annahmen über den zu erwartenden Wirkungsquerschnitt, der noch nicht schwellennah vermessen wurde, das stark unterdrückte Signal gegenüber Untergrundereignissen hinreichend angereichert werden kann. Dies erlaubt eine klare Identifizierung des DD(quer)-Ausgangskanales, wobei die wesentlichen Untergrundbeiträge identifiziert und diskutiert werden
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Silva, Daiane Piva Barbosa da. "Desenvolvimento de estruturas do tipo bi-camada baseadas em camadas auto-organizadas e polianilina para a proteção contra a corrosão de ligas de alumínio". Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-13082010-152925/.
Testo completoAbstract (sommario):
Um método amplamente utilizado na proteção contra a corrosão de ligas de alumínio é a formação de camadas de conversão de cromo. Na busca de métodos \"ambientalmente amigáveis\" de proteção contra corrosão existe a possibilidade da utilização de polímeros condutores, como a polianilina (PAni), que pode atuar por efeito barreira, assim como pela absorção de cargas provenientes da solução e / ou camadas auto-organizadas (SAM, do inglês \"self assembled monolayers\"), onde a proteção pode ocorrer de forma indireta, quando a SAM atua como promotora de adesão para outros revestimentos ou de forma direta, quando a própria monocamada bloqueia o acesso de substâncias responsáveis pela corrosão, à superfície protegida. Neste trabalho é proposta a utilização de bi-camadas baseadas de propil-trimetóxi-silano (PTMS) + PAni e octadecil-trimetóxi-silano (ODTMS) + PAni para a proteção contra a corrosão das ligas de alumínio AA1050, AA2024 e AA7075. Para os ensaios de corrosão foram utilizadas as técnicas de potencial de circuito aberto, curvas de polarização potenciodinâmica e espectroscopia de impedância eletroquímica. Análise de microscopia óptica e microscopia eletrônica de varredura (MEV) foram realizadas antes e após os ensaios de corrosão para verificar a eficiência de proteção contra corrosão dos revestimentos propostos. Adicionalmente foram realizados testes de névoa salina e aderência, além da caracterização das ligas por MEV e espectroscopia de energia dispersiva de raios X (EDX). Os resultados obtidos demonstram que os tratamentos utilizados resultaram em melhoras na resistência contra a corrosão na seguinte ordem: PTMS < ODTMS < PAni < PTMS + PAni < ODTMS + PAni, sendo que este último o que apresenta os melhores resultados como maiores deslocamentos do Ecorr para valores mais positivos, diminuição da icorr, menor número de pontos de corrosão após a realização das curvas de polarização, maiores valores de impedância total em todo o intervalo de frequência utilizado e maior resistência à exposição à névoa salina.A method widely used in corrosion protection of aluminum alloys is the formation of conversion layers of chromium. In search of \"environmentally friendly\" corrosion protection methods there is the possibility of using conducting polymers such as polyaniline (PAni), which can act by barrier effect or absorbing charged particles from the solution and / or self-assembled monolayers (SAM), where protection may occur indirectly, when the SAM acts as a promoter of adhesion to other coatings, or directly, when the monolayer blocks the access of aggressive substances to the surface. This work proposes the use of bi-layers based on propyl-trimethoxy-silane (PTMS) + PAni and octadecyl-trimethoxy-silane (ODTMS) + PAni for corrosion protection of aluminum alloys AA1050, AA2024 and AA7075. For the corrosion tests were used different techniques such as: open circuit potential, potentiodynamic polarization curves and electrochemical impedance spectroscopy. Analysis of optical microscopy and scanning electron microscopy (SEM) were performed before and after the corrosion tests in order to verify the efficiency of the proposed coatings in corrosion protection. Additionally, tests of salt spray and adhesion were made, in addition to the characterization of the alloys by SEM and X-ray dispersive energy. The results show that the treatments resulted in improvements in corrosion resistance in the following order: PTMS < ODTMS < PAni < PTMs + PAni < ODTMS + PAni. The last one gives the best results such as larger shifts of the Ecorr to more positive values, decrease of the icorr, fewer corrosion points after the polarization curves, higher values of total impedance in the entire range of frequency used and more resistant to the exposure to salt spray.
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Céspedes, Gallardo Fernando. "Colegio Luz de América con internado. Institución: Prefectura del departamento de Pando". Universidad Mayor de San Andrés. Programa Cybertesis BOLIVIA, 2008. http://www.cybertesis.umsa.bo:8080/umsa/2008/cespedes_gf/html/index-frames.html.
Testo completoAbstract (sommario):
Hoy en día la educación popular es una de las mayores preocupaciones de la sociedad, pues de ella depende el desarrollo económico, social, científico, técnico y cultural del país y del mundo entero. “La filosofía de la educación delega en los padres el derecho de la educación de sus hijos; pero cuando los padres no pueden hacer uso de este derecho, es la comunidad la que debe ayudarlos. Pero no siempre, una comunidad puede resolver este problema por si misma, entonces es el estado a quien corresponde auxiliarla y asistir en este derecho". (Durheim). Pensamos que se debe optar por brindar verdaderas herramientas que sirvan de apoyo a quienes tienen el gran peso de formar a la nińez. Para dar una respuesta al problema de la educación, es necesario crear unidades escolares que atiendan las necesidades de los nińos y adolescentes; adecuando el funcionamiento de las infraestructuras de acuerdo a los sistemas y métodos pedagógicos implantados; teniendo en cuenta los progresos y cambios que se producen constantemente en la pedagogía. Ello exige diseńar los espacios educativos necesarios para una enseńanza completa, que facilite la labor del educador y colabore a dar una educación integral a nińos y adolescentes. El proporcionar una infraestructura adecuada es tal vez el mejor incentivo para que el educando alcance un buen desarrollo físico e intelectual. Con estas consideraciones y permaneciendo en nuestras mentes las impresiones recibidas en visitas a escuelas urbanas y rurales, en conversaciones con maestros y maestras sobre su angustia ante el reto de implantar los planteamientos de cambio de la Reforma Educativa en el aula y demás ambientes educativos, este trabajo intenta ser una respuesta a como realizar esos cambios, pues contando con los medios será más fácil trabajar por una mejor calidad en la educación
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Quagli, Tommaso [Verfasser]. "Hardware developments for the strip detector of the PANDA MVD / Tommaso Quagli". Gießen : Universitätsbibliothek, 2015. http://d-nb.info/1080120238/34.
Testo completo
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Grape, Sophie. "PWO Crystal Measurements and Simulation Studies of Anti-Hyperon Polarisation for PANDA". Licentiate thesis, Uppsala universitet, Kärnfysik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-142861.
Testo completoAbstract (sommario):
The Gesellschaft für Schwerionenforschung (GSI) facility in Darmstadt, Germany, will be upgraded to accommodate a new generation of physics experiments. The future accelerator facility will be called FAIR and one of the experimentsat the site will be PANDA, which aims at performing hadron physics investigations by colliding anti-protons with protons. The licentiate thesis consistsof three sections related to PANDA. The first contains energy resolutionstudies of PbWO4 crystals, the second light yield uniformity studies of PbWO4 crystals and the third reconstruction of the lambda-bar-polarisation in the PANDA experiment. Two measurements of the energy resolution were performed at MAX-Lab in Lund, Sweden, with an array of 3x3 PbWO4 crystals using a tagged photon beam with energies between 19 and 56 MeV. For the April measurement, the crystals were cooled down to -15 degrees C and for the September measurement down to -25 degrees C. The measured relative energy resolution,
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Bianco, Simone [Verfasser]. "Tracking and vertex reconstruction with the PANDA Micro-Vertex-Detector / Simone Bianco". Bonn : Universitäts- und Landesbibliothek Bonn, 2013. http://d-nb.info/104497155X/34.
Testo completo
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Schmidt, Mustafa Andre [Verfasser]. "Particle identification with the Endcap Disc DIRC for PANDA / Mustafa Andre Schmidt". Gießen : Universitätsbibliothek, 2018. http://d-nb.info/1153334860/34.
Testo completo
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Pérez, Andrade Gabriela. "Production of the Σ0-bar hyperon in the PANDA experiment at FAIR". Thesis, Uppsala universitet, Kärnfysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-375552.
Testo completoAbstract (sommario):
The PANDA experiment is one of the main pillars of the Facility for Antiproton and Ion Research (FAIR), currently under construction in Darmstadt, Germany. PANDA will be a fixed target experiment designed for the study of non-perturbative phenomena of the strong interaction. Strange hyperon production is governed by m(s) ~ 100 MeV, which corresponds to the confinement domain. Thus, hyperons are suitable probes in this energy region. This work is a simulation study focused on the feasibility of studying the production of Σ0-bar and Λ hyperons in the pbar p -> Σ0-bar Λ reaction with the PANDA detector. A 10^4 events sample simulated at p(beam) = 1.771 GeV/c is used to perform a single-tag (inclusive) and a double-tag (exclusive) event selection. From the former, it is concluded that the single-tag method does not provide with the clean signal required for spin observables extraction. In contrast, exclusive event selection provides with a signal reasonably clean from combinatorial background and completely clean from generic hadronic background events. A signal (Σ0-bar Λ) reconstruction efficiency of ε = 5.3 ± 0.2 % is obtained for exclusive event selection. The corresponding signal to background ratio is S/B(Total) ~ 6 and the significance value is ~ 21. In addition, an exclusive event selection is performed on a 10^4 events sample simulated at p_(beam) = 6 GeV/c. Almost all the generic hadronic background events are removed by the applied selection criteria. At this beam momentum, the obtained signal efficiency is ε = 6.1 ± 0.3%, the signal to total background ratio is S/B(Total) ~ 4 and the significance is ~22. Both efficiencies are smaller compared to a previous simulation study on this channel, but are large enough to enable a study of the exclusive production of the pbar p -> Σ0-bar Λ reaction at PANDA. The difference between the results of this thesis work and the previous work is attributed to the more realistic implementation of the signal production mechanism, as well as the detector and reconstruction algorithms.
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Vivar, Anaya Judith. "Población funeraria en las Huacas Pando y Santa Cruz (Valle del Rímac)". Pontificia Universidad Católica del Perú, 2014. http://repositorio.pucp.edu.pe/index/handle/123456789/113757.
Testo completo
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Borrami, Sina. "A control unit for a Digitizer System for the PANDA Electromagnetic Calorimeter". Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-421560.
Testo completoAbstract (sommario):
PANDA is the next generation hadron physics detector under construction at the Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany to accurately detect and parameterize particles with kinetic energies from 1MeV to 8GeV. PANDA is a 4π detector and due to its unique shape, all the readout electronic from ADC modules, power supplies, and a controller unit is housed in the liquid-cooled crates mounted inside the detector. Therefore, the readout electronics are exposed to a high level of magnetic field and radiation. The controller unit as the critical component of the digitization system with adequate radiation resiliency governs the crate. The control unit manages power supplies, monitors the radiation damages of each ADC modules, offer a mechanism to re-program the ADC module firmware, and finally features a redundant communication for the crate over fiber optics. The purpose of this thesis is to study and design the controller unit hardware that meets the specification of the PANDA experiment.