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A Study of Spiking and Relaxation Oscillations in Nd:YAG Laser Using Measured Laser ParametersShori, Ramesh K 14 September 1993 (has links)
It was shown analytically and experimentally that when the cavity losses are perturbed, the output intensity experiences an amplitude modulation or becomes a regular train of spikes, with the frequency depending on both the frequency of perturbation as well as pump power. Coupled nonlinear rate equations including the cavity perturbation term, are solved numerically by a Runga-Kutta method using experimentally-measured parameter values for Nd: Y AG laser. A continuously pumped Nd: Y AG laser was used to verify this theory.
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”Jämställdhet är när en kvinnlig tönt och en manlig tönt har samma chans” : En kvalitativ studie av synen på jämställdhet bland kommunfullmäktigeledamöter i en inlandskommun i norra SverigeKapell, Maria, Pettersson, Felicia January 2013 (has links)
Denna uppsats är skriven på uppdrag av en mindre kommun i norra Sverige och behandlar ämnet jämställdhet. Syftet var att undersöka synen på jämställdhet bland kommunfullmäktigeledamöter i denna kommun med frågeställningar som handlade om deras personliga upplevelser, kunskaper och attityder kring jämställdhet samt hur man arbetar i kommunen och hur man vill arbeta i framtiden med jämställdhetsfrågor. I syftet ingick även att vägleda kommunen i deras framtida jämställdhetsarbete. Teoretiska utgångspunkter som fungerade som analytiska verktyg var teorier om motståndmot jämställdhet, organisationsteorier och begreppen kvantitativ och kvalitativ jämställdhet. Kvalitativa intervjuer användes som metod, åtta kommunfullmäktigeledamöter valdes ut med hjälp av både ett målinriktat urval och ett bekvämlighetsurval. Vid analys av det empiriska materialet användes Kvales kategoriseringsmodell. De huvudsakliga resultaten visade att jämställdhet tolkades på många olika sätt och kunskapen var varierad. Lika representation bland könen var det vanligast förekommande svaret på frågan vad jämställdhet är och det var tydligt att maktfrågor osynliggjordes i kommunen
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Thinking in painting : Gilles Deleuze and the revolution from representation to abstractionPurdom, Judy January 2000 (has links)
Reading with Gilles Deleuze, this thesis explores art as a production that abandons representation as a formation of identity in favour of an ontology of becoming. I argue that the move to abstraction in painting resonates with the aim of "thought without image" because it counters representation with a radical materiality that returns painting to the movement of matter. In order to situate Deleuze's thinking on art within a trajectory of a philosophy of becoming I open the thesis with a chapter on Bergson and Merleau-Ponty. Here I introduce the notion of 'thinking in painting' and argue that, while in Merleau-Ponty's phenomenology of art painting is a pedagogical investigation of the pre-human, chaotic and invisible 'depth' of a lived visible world, Deleuze takes Bergson's commitment to the possibility of moving beyond the human seriously and reverses the order of perception in order to seize the non-human virtual that eludes actualization. For Deleuze, the task of painting is therefore not to reveal the ontogenesis of the actual and the lived, but to extract the virtual and to embody it as a monument to that event. In abstraction the interest moves from the mechanism of perception to the work of paint, and in the subsequent chapters on Mondrian, Pollock, Klee and Bacon I explore specific practices and their peculiar logic of sensation. In Mondrian we see the strange space of virtuality unleashed when the line is not constrained by the closure of the punctual system, and in Pollock's explosive "all-over" paintings identify that space not as a chaos but as a chaosmosis or machinic heterogeneity. I argue that by understanding these modulating and rhythmic compositions as haptic spaces, we break through the distancing of visibility and can begin to think at the level of expressive matter. I then turn to Klee, and using the famous image of "taking a walk with a line" explore the notion of the emergent figure in the context of Klee's aim to "render visible". What we find is an art where space and the form of expression works on the plane of composition and refers only to the unfolding rhythms of the abstract line. In the final chapter I discuss Bacon's portraits and look at how the multiplicity of the event that is maintained in the diagrammatic composition is drawn into the recognizable face. I conclude that the embodiment of the non-human event forces thought to confront the possibility of the emergent identity that is realized in the abstraction of "thinking in painting".
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A Lombard manuscript, Paris B.N. Latin 757 : associated manuscripts and the context of their illuminationSutton, Kay Ann January 1984 (has links)
The basis of this study is a close examination of the manuscripts which, in their decoration and illustration, form a stylistic group around the Book of Hours/Missal, Paris, B.N. Latin 757. Those painted in the same style are fr.343, Smith-Lesouef 22, n.a.lat.1673, Latin 8045, all in the Biblioth'que Nationale, and.s.2.3l (Latin 862) in the Biblioteca Estense, Modena. Two other manuscripts which are less closely related to this central group, Paris, B.N. n.a.fr .5243 and Munich Staatsbibliothek Latin 23215, are also discussed. Details of the decoration have made possible the identification of the original owner of two of the Books of Hours, Latin 757 and Smith-Lesouf 22, as Bertrando de' Rossi, conte di San Secondo (c.1346-1396), and of the romance Guiron le Courtois, n.a.fr .5243, as Bernab Visconti. Some aspects both of the finished painting and of the distribution of work in the unfinished manuscripts indicate that these books were the product of collaboration between more than one painter. The division of work however, is usually by process and not by unit and the essential characteristics of the style seem to be dependent upon one artist. Previously the manuscripts in the style of Latin 757 have all been dated to c.1380. Here the sequence in which they were decorated between c.1383 to c.1395 is established. These books are the earliest group of Lombard manuscrits-de-luxe to have survived. This style seems to have evolved in response to the demand for luxury books from the Milanese court. It is suggested here that the interest in illuminated books of Bernab? Visconti and his court may have been more influential than the later and, as far as it is known, restricted patronage of his nephew Giangaleazzo and that, correspondingly, Milan had ascendancy over Pavia as a centre for book-production at the end of the fourteenth century.
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Perceptions of Holocaust memory : a comparative study of public reactions to art about the Holocaust at the Jewish Museum in New York and the Israel Museum in Jerusalem (1990s-2000s)Popescu, Diana January 2012 (has links)
This thesis investigates the changes in the Israeli and Jewish-American public perception of Holocaust memory in the late 1990s and early 2000s, and offers an elaborate comparative analysis of public reactions to art about the Holocaust. Created by the inheritors of Holocaust memory, second and third-generation Jews in Israel and America, the artworks titled Your Colouring Book (1997) and Live and Die as Eva Braun (1998), and the group exhibition Mirroring Evil. Nazi Imagery/Recent Art (2002) were hosted at art institutions emblematic of Jewish culture, namely the Israel Museum in Jerusalem, and the Jewish Museum in New York. Unlike artistic representation by first generation, which tends to adopt an empathetic approach by scrutinizing experiences of Jewish victimhood, these artworks foreground images of the Nazi perpetrators, and thus represent a distancing and defamiliarizing approach which triggered intense media discussions in each case. The public debates triggered by these exhibitions shall constitute the domain for analyzing the emergent counter-positions on Holocaust memory of post-war generations of Jews and for delineating their ideological views and divergent identity stances vis-à-vis Holocaust memory. This thesis proposes a critical discourse analysis of public debates carried out by leading Jewish intellectuals, politicians and public figures in Israel and in America. It suggests that younger generations developed a global discourse which challenges a dominant meta-narrative of Jewish identity that holds victimization and a sacred dimension of the Holocaust as its fundamental tenets.
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Estudo Istópico dos Arenitos da Formação Ipú e Serrote Santana, noroeste do Ceará. / Istópico Study of the Sandstones of the Ipú and Serrote Santana Formation, northwest of Ceará.Soares, Francisca Robenia Ferreira January 2017 (has links)
SOARES, Francisca Robênia Ferreira. Estudo Isotópico dos Arenitos da Formação Ipú e Serrote Santana, noroeste do Ceará. 2017. 133 f. Dissertação (Mestrado em Geologia)- Universidade Federal do Ceará, Fortaleza, 2017. / Submitted by JOÃO CAVALCANTI JUNIOR (jbeniciojunior@yahoo.com.br) on 2017-06-19T16:00:03Z
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Previous issue date: 2017 / The Ipú Formation composes the basal portion of the Serra Grande Group, Parnaíba Basin,
and consists of sandstones and conglomerates deposited by interlaced fluvial systems during
the Silurian. In the state of Ceará, these rocks appear in the Serra da Ibiapaba, presenting great
expositions, forming hills and plateaus, on the northeast and east edges of the basin. The
Morrote de Santana has an extension of approximately 30 km, is elongated in the NE-SW
direction and consists of conglomeratic sandstones and sandstones. This silicystic sequence is
aligned in the same direction as the rocks of the Ipú Formation. Although it is frequently
correlated with the Ipú Formation, the rocks that make up the Morrote Santana are separated
from the same in about 70 km, by expositions of epochal rocks (Jaibaras Group) and pre-
Cambrian. In this context, the objective of the present study is to test the hypothesis that the
Santana de Acaraú mound represents a testimonial hill of the Ipú Formation. The
methodology used in the research involved geological reconnaissance techniques for the
description of lithotypes and sample collection and Sm-Nd petrographic and isotopic analysis.
The selected areas are located in the vicinity of Santana de Acaraú and Guaraciaba do Norte
municipalities, north-west of Ceará, in the transition between the Middle Coreaú and Ceará
Central Domains along the Sobral-Pedro II Line. These regions are bordered by rocks of the
basement (Ceará Group) and lithotypes of the Jaibaras Basin, in addition to a siliciclastic
sequence consisting of conglomerates, sandstone conglomerates, both with polymetallic
characteristics, conglomerate sandstones with criss-cross and icnofossils, and medium
sandstones Thick with ribbed cross laminations. The collected samples are representative of
the more homogeneous portions of the sedimentary rocks recognized in the field, which were
analyzed microscopically and isotopically, to determine their isotopic signatures. The
petrographic study verified mature rocks and sub - sills, with a framework consisting of quartz
grains and matrix occurring in a small amount (between 3-6%), of arenitic and sometimes
clayey composition. These characteristics allow to classify these rocks as quatzo-sandstones.
The isotopic signatures obtained showed little variation in the amounts of εNd (18.41 - 20.15)
and TDM model ages varying between 3.21-2 Ga and 3.43-1.73 Ga, for the sediments present
in the regions near Santana de Acaraú and Guaraciaba do North, respectively. The TDM ages
indicate paleoproterozoic sources and archives for both areas and the low variation in εNd
values reinforce the idea of the same source, evidencing evidence that the arenitic body of
Santana de Acaraú represents a testimonial hill of the Ipú Formation.
Key Words: Isotopic Geology, Sm-Nd Isotopes, Parnaíba Basin, Serrote Santana, Ipu
Formation / A Formação Ipú compõe a porção basal do Grupo Serra Grande, Bacia do Parnaíba, e é
constituída por arenitos e conglomerados depositados por sistemas fluviais entrelaçados,
durante o Siluriano. No estado do Ceará, essas rochas afloram na Serra da Ibiapaba,
apresentando grandes exposições, formando serras e chapadas, nas bordas nordeste e leste da
bacia. O Morrote de Santana possui extensão de, aproximadamente, 30 km, encontra-se
alongado na direção NE-SW e está constituído por arenitos e arenitos conglomeráticos. Essa
sequência siliclástica encontra-se alinhada na mesma direção que as rochas da Formação Ipú,
Apesar de ser frequentemente correlacionado a Formação Ipú, as rochas que compõe o
Morrote Santana encontram-se separadas da mesma em cerca de 70 km, por exposições de
rochas eopaleozóicas (Grupo Jaibaras) e pré-cambrianas. Dentro desse contexto, o objetivo do
presente estudo consiste em testar a hipótese de que o morrote de Santana de Acaraú
representa um morro testemunho da Formação Ipú. A metodologia utilizada na pesquisa,
envolveu técnicas de reconhecimento geológico, para descrição dos litotipos e coleta de
amostras e análise petrográfica e isotópica Sm-Nd. As áreas selecionadas localizam-se nas
proximidades dos municípios de Santana de Acaraú e Guaraciaba do Norte, noroeste do
Ceará, na transição entre os Domínios Médio Coreaú e Ceará Central, ao longo do
Lineamento Sobral-Pedro II. Essas regiões encontram-se bordejadas por rochas do
embasamento (Grupo Ceará) e litotipos da Bacia do Jaibaras, além de uma sequência
siliciclástica constituída por conglomerados, conglomerados areníticos, ambos com
características polimiticas, arenitos conglomerados com estratificação cruzada acanalada e
icnofósseis e arenitos médios a grossos com estratificações cruzadas acanaladas. As amostras
coletadas são representativas das porções mais homogêneas das rochas sedimentares
reconhecidas em campo, as quais foram analisadas microscopicamente e isotopicamente, para
determinação de suas assinaturas isotópicas. O estudo petrográfico constatou rochas maduras
e submaduras, com arcabouço constituído por grãos de quartzo e matriz ocorrendo em pouca
quantidade (entre 3-6 %), de composição arenítica e, por vezes, argilosa. Tais características
permitem classificar essas rochas como quatzo-arenitos. As assinaturas isotópicas obtidas
apresentaram pouca variação nas quantidades de εNd (18,41- 20,15) e idades modelo TDM
variando entre 3.21 - 2 Ga e 3.43-1.73 Ga, para os sedimentos presentes nas regiões próximas
a Santana de Acaraú e Guaraciaba do Norte, respectivamente. As idades TDM indicam fontes
paleoproterozóicas e arquenas para ambas as áreas e a baixa variação nos valores de εNd,
reforçam a ideia de mesma fonte, constatando indícios de que o corpo arenítico de Santana de
Acaraú representa um morro testemunho da Formação Ipú.
Palavras
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Interações entre átomos de Rydberg frios em processos de transferência populacional / Cold Rydberg atoms interactions in population transfer processesJader de Souza Cabral 02 April 2013 (has links)
Neste trabalho, apresentamos um amplo estudo das interações de longo alcance entre átomos de Rydberg frios na presença de campos elétricos estáticos. Nós observamos a transferência de população do estado quase molecular nD + nD para o estado (n+2)P após excitação pulsada na região de 29 ≤ n ≤ 41 em uma amostra de Rb aprisionada em uma armadilha magneto-óptica. A taxa de transferência pode ser manipulada com a presença de campo elétrico estático. Para explicar tais observações um modelo teórico multiníveis foi utilizado. O estudo de evolução temporal da população em (n+2)P mostrou que a dinâmica do processo é condizente com a interpretação clássica de uma transição diabática no domínio temporal. Utilizando um laser de excitação contínuo, realizamos experimentos envolvendo estados nD + nD, para 37 ≤ n ≤ 45, e estados nS + nS, para 39 ≤ n ≤ 47, onde foi possível estudarmos processos de transferência de população com resolução da estrutura fina. Também realizamos experimentos, tanto para estados nD quanto nS, para verificar a importância da estrutura hiperfina da estado fundamental no processo de transferência de população. / In this work, we present an extensive study of long-range interactions between cold Rydberg atoms in the presence of static electric fields. We have observed the population transfer from the quasi-molecular nD + nD state to the (n +2) P state after pulsed excitation for 29 ≤ n ≤ 41 in a sample of Rb trapped atoms in a magneto-optical trap. The transfer rate can be manipulated by the static electric field. To explain such observations, a multilevel theoretical model was used. The study of the time evolution of the population (n +2) P indicates that the dynamics of the process is consistent with a classical interpretation of a nonadiabatic transition in time domain. Using a CW laser excitation, experiments involving states nD + nD, for 37 ≤ n ≤ 45 states and nS + nS for 39 ≤ n ≤ 47, where performed with high spectral resolution. We also performed experiments for both states, nD and nS, to verify the importance of the hyperfine structure of the ground state in the process of population transfer.
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Avaliação Clínica de Pacientes Submetidos à Frenectomias Labiais com Laser de Nd:YAG e Cirurgia ConvencionalMedeiros Júnior, Rui 24 May 2012 (has links)
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Previous issue date: 2012-05-24 / O objetivo do estudo foi comparar resultados clínicos pré, trans e pós-operatórios relacionados às frenectomias labiais realizadas pela técnica convencional e com laser de Nd:YAG. Quarenta pacientes foram distribuídos em 2 grupos: G1 - cirurgia pela técnica convencional (n=22) e G2 – cirurgia com laser de Nd:YAG (n=18). O tipo de inserção do frênulo, sangramento, tempo cirúrgico, necessidade de sutura, medo pré-operatório e desconforto pós-operatório foram avaliados. A maioria dos frênulos (90%) foi classificado como de inserção papilar ou transpapilar e não houve diferença relacionada ao medo pré-operatório entre os grupos (p=0,593). Os pacientes do G2 não necessitaram de sutura (p<0,001) e apresentaram ausência de sangramento trans-operatório na maioria dos casos (p<0,001), acarretando em uma redução do tempo cirúrgico (p<0,001). Este estudo revelou algumas vantagens da terapia realizada com laser de Nd:YAG relacionadas ao ato operatório, entretanto não foi observada uma superioridade nos resultados clínicos pós-operatórios de dor e função oral.
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Avaliação comparativa entre o uso do laser de Nd: YAG ou cirurgia convencional em lesões compatíveis com granuloma piogênicoRAMEIRO, Ana Carine Ferraz 22 February 2017 (has links)
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Previous issue date: 2017-02-22 / O Granuloma piogênico (GP) é uma proliferação de tecido conjuntivo a um estímulo ou lesão, geralmente solitária, séssil benigna apresentando-se como crescimento hemorrágico. O laser de Nd:YAG (λ=1.064 nm) é uma importante ferramenta de tratamento cirúrgico dos tecidos moles bucais, principalmente lesões vasculares. O objetivo deste trabalho foi avaliar à exérese de lesões diagnosticadas como granuloma piogênico através da técnica convencional em comparação com o laser de Nd: YAG (λ=1.064 nm) com base em parâmetros clínicos pré, trans e pós- cirúrgicos. Neste trabalho foram incluídos 30 pacientes, 15 deles submetidos à exéreses de lesões de granuloma piogênico pelo uso do Laser de Nd:YAG (λ=1.064 nm) (G1) e os demais pela técnica convencional (G2). Os dados foram avaliados com um nível de significância de 5% (p<0,05). No grupo submetido ao laser de Nd:YAG (λ=1.064 nm) observou-se uma diferença estatisticamente significante entre os pacientes quanto ao tempo médio gasto para a realização dos procedimentos cirúrgicos onde uso do laser reduziu o tempo em cerca de 3 minutos (p<0,001), houve uma menor ocorrência de sangramento durante a cirurgia (p<0,001) e uma reduzida necessidade de sutura. Os pacientes tratados através do método convencional relataram menor sensação de medo antes da cirurgia (p<0,001), necessitaram de uma menor quantidade de tubetes para anestesia infiltrativa (p<0,001). Com relação à dor sentida pelos pacientes no período pós-operatório foi observado que em ambos os grupos, passados quinze dias da cirurgia, não houve relato de dor moderada ou severa entre os pacientes. Os resultados apresentados são indicativos da superioridade do uso do laser de alta potência Nd:YAG (λ=1.064 nm) em cirurgias na cavidade oral. / Piogenic Granuloma (GP) is a proliferation of connective tissue to a stimulus or lesion, usually solitary, benign sessile presenting as hemorrhagic growth. The Nd: YAG laser (λ = 1064 nm) is an important tool for the surgical treatment of oral soft tissues, mainly vascular lesions. The objective of this study was to evaluate the exertion of lesions diagnosed as pyogenic granuloma by the conventional technique in comparison with the Nd: YAG laser (λ = 1064 nm) based on pre, trans and post- surgical clinical parameters. In this study 30 patients were included, 15 of them submitted to exogenous lesions of granuloma pyogenic by the use of Nd: YAG laser technique (λ = 1064 nm) (G1) and the others by the conventional technique (G2). The data were evaluated with a significance level of 5% (p <0.05). In the group submitted to Nd: YAG laser (λ = 1064 nm), a statistically significant difference was observed among patients regarding the average time spent performing the surgical procedures where laser use reduced the time in about 3 minutes (p < 0.001), there was a lower occurrence of bleeding during surgery (p <0.001) and a reduced need for suturing. Patients treated using the conventional method reported a lower sensation of fear of fear before surgery (p <0.001), requiring a smaller number of tubes for infiltrative anesthesia (p <0.001). Regarding the pain felt by the patients in the postoperative period, it was observed that in both groups, after fifteen days of surgery, there was no report of moderate or severe pain among the patients. The results presented are indicative of the superiority of the use of the high power laser Nd: YAG (λ = 1,064 nm) in surgeries in the oral cavity.
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Avaliação comparativa do uso do laser de Nd:YAG ou cirurgia convencional no tratamento de hiperplasia fibrosa inflamatóriaCANUTO, Thais Sayonara Romão 23 January 2017 (has links)
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Previous issue date: 2017-01-23 / CAPES / O objetivo desse estudo preliminar foi avaliar e comparar resultados clínicos pré, trans e pós-operatórios relacionados às exéreses de lesões diagnosticadas como hiperplasia fibrosa realizadas pela técnica convencional e com laser de Nd:YAG. Vinte pacientes foram distribuídos em dois grupos: G1 - cirurgia com laser de Nd:YAG (n=10) e G2 – cirurgia pela técnica convencional (n=10). O tamanho da lesão de hiperplasia fibrosa, consistência, tipo de inserção, medo pré-operatório, quantidade de tubetes anestésicos, intensidade de sangramento, tempo cirúrgico, necessidade de sutura e desconforto pós-operatório foram avaliados. Os dados obtidos foram avaliados com valor de significância de 5% (p < 0,05). Não houve diferença relacionada ao medo pré-operatório entre os grupos (p=0,485). Do ponto de vista transcirúrgico foi observado um tempo médio de 2,7 minutos para o procedimento a laser contra 7,8 minutos no procedimento convencional (p=0,037). Os pacientes do grupo G1 apresentaram menor intensidade de sangramento (p=0,001), não necessitaram de sutura (p<0,001) e menor uso de analgésico no pós-cirúrgico (p=0,05). A presente pesquisa aponta vantagens nos resultados clínicos trans e pós-operatórios em tratamentos de hiperplasias fibrosas realizadas com laser de Nd:YAG, quando comparados com a cirurgia convencional. Estudos adicionais com um maior número de pacientes são necessários para melhor elucidar as vantagens da cirurgia a laser. / The aim of the study was to compare pre, trans and post surgery clinical results related to the exeresis of lesions diagnosed as imflammatory fibrous hyperplasia performed by the conventional technique compared to Nd: YAG laser. Twenty patients were divided into 2 groups: G1 - Nd: YAG laser surgery (n = 10) and G2 - conventional surgery (n = 10). The data were evaluated with a significance level of 5% (p <0.05). From the transsurgical point of view, an average time of 2.7 minutes was observed for the laser procedure versus 7.8 minutes in the conventional procedure (p = <0.05). Patients in the G1 group had less bleeding (p = <0.05), discomfort only in the first hour after the surgical procedure and need for analgesics in only 10% of the patients, in the first 6 days after the procedure. Regarding the G2 group, there was a need for suture in all the exesions (p> 0.05), a greater bleeding and 50% of the patients used analgesics until eight days after surgery. The results of the present study indicate advantages in the accomplishment of exéreses of IFH lesions with the use of Nd:YAG laser when compared to conventional surgery. Additional studies with a greater number of patients are needed to better elucidate the advantages of laser therapy.
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