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1
Nachtsheim, Stephan. "Emil Lasks Grundlehre /." Tübingen : J.C.B. Mohr, 1992. http://catalogue.bnf.fr/ark:/12148/cb35602055v.
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Kamma, Christina-Stamatia. "Healing of LASIK flaps." Thesis, Cardiff University, 2007. http://orca.cf.ac.uk/54605/.
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The aim of this study was to obtain a better understanding in the healing of LASIK-like flaps using an in vitro organ culture method in bovine corneas. At early stages of the PhD, during protocol optimisation, a 5mm trephine was used to injure bovine corneas. At later stages a custom-made eye holder was used to induce LASIK-like incisions in corneas. Immunohistochemistry for a-smooth muscle actin (aSMA) and cytokeratin was used to monitor myofibroblast and epithelial cell expression, respectively, during the wound healing process. Additionally, the effect of certain cytokines (i.e. TNFa, Fas ligand, TGF-Pi and IL-la) was tested in terms of corneal transparency, myofibroblast expression and tissue mechanical strength during the healing process. The later series of experiments was an attempt to manipulate and improve wound healing after LASIK. Healing in this in vitro system closely followed the effects that are already known from the literature. In addition, preliminary evidence on the cytokine corneas proved that there is a correlation between cytokine type and concentration with the effect in tissue transparency, extend of wound healing response and tissue mechanical strength. X-ray diffraction also provided important information about collagen ultrastructural changes in the corneas during the healing process. Parameters such as fibrillar diameter, spacing, distribution and orientation were studied. Collagen fibrillar diameter and spacing remained constant for control corneas during the organ culture time-span, indicating that this in vitro system does not induce any swelling effects on the tissue. However, injured corneas became significantly swollen (p<0.05) during culture. Swelling effects were more severe in trephined corneas than in LASIK-like injured ones. However, collagen fibrillar diameter remained normal in the periphery of injured corneas, but it increased significantly in areas within and around the wound in trephined samples and in the flap incision site for LASIK-like ones. In both types of wounding, collagen orientation changes were observed and were associated with the process of creating the injury. However, in the case of trephine wounded corneas, tissue swelling and changes in collagen orientation reflected the processes of tissue repair. These differences will determine corneal stability and strength follow trauma and, possibly, refractive surgery. The transparency of the cornea depends on both the collagen and the interstitial proteoglycans. In order to obtain a better insight in ultrastructural changes during the wound healing process molecular modelling techniques were used in order to construct a theoretical model for the core protein of biglycan. This molecule is a dermatan sulphate proteoglycan and its numbers increase up to seven times during wound healing. It is considerably larger than the rest of proteoglycans and molecular modelling also revealed numerous potential collagen interaction sites.
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Björkgren, Andreas, and Henrik Brodin. "First Impression Lasts : The First Meeting." Thesis, Jönköping University, JIBS, Business Administration, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-313.
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When firms are doing business it is important to meet the customer’s expectations. It is often in the first impression (the first time the parties meet in a sales encounter) that the seller fails to do this, sometimes resulting in the prospective customer dropping the whole thought of a business deal and no further relationship is established. The first impression results from the first image and understanding a seller creates in a potential customer: here the latter gets a brief insight into the former’s organization, credibility and overall quality. Each encounter or meeting is an opportunity to achieve trust and build a relationship, but also contains the risk of reducing credibility and losing all chances of a relationship. The purpose of this thesis is to describe and analyse the importance of the first impression when creating and building a business to business relationship and to describe the factors which influence this process. The theoretical framework is based on theories regarding the concept of first impression and the implications of two-way communication during the first encounter. These include the seller’s preparation and categorisation of the customer before each encounter. Other variations of communication concerns verbal and non-verbal communication, generalizations, cultural differences and circumstances where a failure can turn into an advantage. The present qualitative case study is based on interviews with five highly competent respondents with long experience of business relationships. They were chosen after discussions with Walter Carvajal, owner and MD of City Guest Service. The results showed that the first impression was very important in creating a business relationship. Some variables, e.g. gender, had less significance. Generally, the first impression included the small things a person perceived and interpreted during the first encounter. Combined, they determined whether a person chose to do business with the counterpart in question. All aspects of verbal and non-verbal commu-nication formed a basis for judging the other person. Cultural differences increased the acceptance level, reducing the risk of failure, when the parties were from differ-ent cultures.
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Yi, Fan, and n/a. "Optimal Algorithmic Techniques of LASIK Procedures." Griffith University. School of Engineering, 2006. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20070216.152339.
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Clinical wavefront-guided corneal ablation has been now the most technologically advanced method to reduce the dependence of glasses and contact lenses. It has the potential not only to eliminate spherocylindrical errors but also to reduce higher-order aberrations (HOA). Recent statistics show that more than 96% of the patients who received laser in situ keratomileusis (LASIK) treatment reported their satisfaction about the improvement on vision, six months after the surgery. However, there are still patients complaining that their vision performance did not achieve the expectation or was even worse than before surgery. The reasons causing the unexpected post-surgical outcome include undercorrection, overcorrection, induced HOA, and other postoperative diseases, most of which are caused by inaccurate ablation besides other pathological factors. Therefore, to find out the method to optimize the LASIK procedures and provide a higher surgical precision has become increasingly important. A proper method to calculate ablation profile and an effective way to control the laser beam size and shape are key aspects in this research to resolve the problem. Here in this Master of Philosophy degree thesis, the author has performed a meticulous study on the existing methods of ablation profile calculation and investigated the efficiency of wavefront only ablation by a computer simulation applying real patient data. Finally, the concept of a refractive surgery system with dynamical beam shaping function is sketched, which can theoretically overcome the disadvantages of traditional procedures with a finite laser beam size.
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Knight, Susan M. "LAPIS Aids Small Farmers in Lesotho." College of Agriculture, University of Arizona (Tucson, AZ), 1990. http://hdl.handle.net/10150/295684.
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Eurieult, Isabelle. "L'outremer." Paris 5, 1989. http://www.theses.fr/1989PA05P063.
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Литвиненко, Галина Іванівна, Галина Ивановна Литвиненко, Halyna Ivanivna Lytvynenko, and D. S. Yankov. "Power battery that lasts for 30 years." Thesis, Видавництво СумДУ, 2008. http://essuir.sumdu.edu.ua/handle/123456789/16053.
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Wu, Yih-Tyng. "Change of line of sight after lasik /." The Ohio State University, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488203857251318.
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Napier, Amelia Carroll. "Generational Tension in Middle English Lais." W&M ScholarWorks, 1992. https://scholarworks.wm.edu/etd/1539625740.
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Iribarne, Ferrer Yolanda. "Sensibilidad al contaste tras LASIK convencional y personalizado." Doctoral thesis, Universitat de Barcelona, 2006. http://hdl.handle.net/10803/1229.
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OBJETIVOS: Determinar la técnica de LASIK (convencional o personalizada) que consigue una mayor calidad visual en los pacientes intervenidos de cirugía refractiva (en términos de agudeza visual, sensibilidad al contraste y sensación subjetiva), así como comparar su efectividad, eficacia, predictibilidad, seguridad, estabilidad y su repercusión en las aberraciones corneales provocadas tras la cirugía.
MATERIAL Y METODOS:
En una muestra de 27 pacientes con las mismas características en los dos ojos se analiza la calidad visual del paciente, así como las aberraciones pre y postoperatorias tras la aplicación de cirugía refractiva corneal con láser Excímer, realizando un tratamiento convencional en un ojo del paciente y un tratamiento personalizado en el otro ojo. Se realizan controles postoperatorios al día siguiente de la cirugía, a la semana, al mes, a los tres, seis y doce meses.
La calidad visual del paciente se analiza en términos de agudeza visual, sensación subjetiva y sensibilidad al contraste con el test CSV-1000. Las aberraciones se han medido con un aberrómetro basado en el método de Hartmann-Shack. El láser se ha aplicado con el Technolas 217z, que posee la capacidad de realizar un tratamiento LASIK estándar o personalizado.
RESULTADOS:
El tratamiento personalizado consigue una calidad visual levemente superior a la técnica convencional en términos de agudeza visual (sobre todo en ganancia de líneas de visión) y sensibilidad al contraste, pero sin significación estadística a los 12 meses de la intervención.
La predictibilidad, eficacia, seguridad y estabilidad de ambos tipos de técnicas son similares. En cuanto a las aberraciones, el tratamiento personalizado ha conseguido reducir o inducir en menor grado aberraciones de tercer y cuarto orden, pero las de quinto orden han empeorado más en los ojos intervenidos con el tratamiento personalizado.
DISCUSIÓN:
Al comparar el tratamiento LASIK convencional de la miopía con el personalizado se puede llegar a afirmar que sólo se encuentran sutiles diferencias entre ellos (como la mayor ganancia de líneas de visión en el tratamiento personalizado) pero sin significación estadística. Esto podría ser debido a que las aberraciones de la población seleccionada no son muy elevadas. Por ello se puede considerar que la ablación personalizada puede lograr una mayor calidad visual tras cirugía refractiva si los pacientes tienen altos valores elevados de las aberraciones de alto orden.
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Pilkauskaitė, Eglė. "Skruzdėlių Lasius fuliginosus tako atsistatymo tyrimas (Hymenoptera: Formicidae)." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2004. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2004~D_20040608_165951-14953.
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In 2003 years the behaviour of ant Lasius fuliginosus was explored. The trial was made in two ways: a) by different sizes of white sheet of paper then the weather conditions were sunny, cloudy, rainy; b) turning one part of path by cant of 180.
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Kilfeather, Aoibheann Aoife. "Glaciation, deformation and till porosity : County Laois, Ireland." Thesis, Queen Mary, University of London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413647.
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Mones, Chelsey. "The lasik experts| A small business plan proposal." Thesis, California State University, Long Beach, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10076457.
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The LASIK market in Orange County, CA is extremely saturated, with the exception of the city of Laguna Niguel. This business plan proposes the creation of The LASIK Experts in Laguna Niguel to fulfill the need for such a LASIK center within the city. Based on the detailed financial projections prepared by the company’s management, it is estimated that a bank loan is necessary to begin the company’s operations successfully. The funds will be used to provide the initial working capital for the first three fiscal years.
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Smith, Harrison B. "The Language And Platform Independent Steering (LAPIS) System." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1337879192.
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Netto, Marcelo Vieira. "Efeitos do uso tópico da mitomicina C na prevenção e tratamento da opacidade corneana em coelhos submetidos à ceratectomia fotorrefrativa." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/5/5149/tde-20022009-132232/.
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Objetivos: Determinar os efeitos celulares e o mecanismo de ação da mitomicina C tópica na prevenção e tratamento da opacidade corneana em coelhos submetidos à ceratectomia fotorrefrativa (PRK). Métodos: Foram submetidos à cirurgia de PRK 224 coelhos para correção de -9 dioptrias esféricas, associada à aplicação de mitomicina C tópica ou solução salina balanceada. O nível de opacidade corneana foi avaliado por meio de análise à lâmpada de fenda. Os animais foram sacrificados quatro horas, 24 horas, quatro semanas e seis meses após a cirurgia. A análise imunohistoquímica foi realizada com as técnicas de TUNEL e foram utilizados os anticorpos Ki67 e alpha-SMA para a análise da apoptose celular, replicação celular e formação de miofibroblastos, respectivamente. Resultados: Todos os grupos submetidos à aplicação de mitomicina C apresentaram um maior número de células positivamente marcadas pelo ensaio com TUNEL (indicando maior taxa de apoptose celular) e um menor número de células positivamente marcadas pelo anticorpo Ki67 (indicando menor taxa de replicação celular). Uma menor quantidade de miofibroblastos (células positivamente marcadas pelo anticorpo alpha-SMA) foi identificada após a aplicação profilática da mitomicina C, comparada com sua aplicação com finalidade terapêutica. Além disso, identificou-se uma zona de acelularidade no estroma anterior de córneas tratadas com mitomicina C, persistente por um período mínimo de seis meses. Conclusões: A aplicação da mitomicina C diminuiu signficativamente a formação de opacidade corneana em coelhos. Apesar da mitomicina C ter induzido uma maior apoptose de ceratócitos e miofibroblastos, seu principal mecanismo de ação, responsável pela prevenção da opacidade corneana, decorreu do bloqueio da replicação dos ceratócitos ou outras linhagens celulares progenitoras dos miofibroblastos. A aplicação da mitomicina C na concentração de 0,002% mostrou-se tão eficiente quanto sua aplicação na concentração de 0,02%. Não obstante, uma persistente diminuição da densidade de ceratócitos no estroma anterior pode representar um sinal de alerta para possíveis complicações a longo prazoPurpose: To determine cellular effects and the mechanism through which topical mitomycin C prevents and treats corneal haze after photorefractive keratectomy (PRK) in rabbits. Methods: Minus nine diopters PRK with mitomycin C or balanced salt solution was performed in two hundred and twenty four New Zealand rabbits. Haze level was graded at the slit lamp. Rabbits were sacrificed at 4 hours, 24 hours, 4 weeks or 6 months after surgery and immunohistochemistry was performed with TUNEL assay, Ki67 and alpha-SMA to analyze keratocyte cells apoptosis, keratocyte cells replication and myofibroblast cells formation, respectively. Results: TUNEL-positive cells increased in all mitomycin C groups (representing more keratocyte cells undergoing apoptosis) while Ki67-positive cells decreased significanlty (representing a decreased keratocyte cells replication) following mitomycin C application. A greater decrease in myofibroblasts was noted with prophylactic mitomycin C treatment than therapeutic mitomycin C treatment. There was, however, an anterior stromal acellular zone in eyes treated with mitomycin C that persisted out to the maximum follow-up of 6 months. Conclusion: Mitomycin C application significantly reduced corneal haze formation in rabbits. Its treatment induces apoptosis of keratocytes and myofibroblasts, but the predominate effect in inhibiting or treating haze appears to be at the level of blocked replication of keratocytes or other progenitor cells of myofibroblasts. Treatment with 0.002% mitomycin C appears to be just as effective as higher concentrations (0.02%) in the rabbit model. However, a persistent decrease in keratocyte cells density in the anterior stroma could be a warning sign for future complications
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Tat, Lien Thieu. "LASIK clinical results and their relationship to patient satisfaction /." University of Sydney. Faculty of Health Sciences, 2006. http://hdl.handle.net/2123/1607.
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Doctor of Philosophy (PhD) OrthopticsThe aim of this study was to evaluate the safety and efficacy of LASIK as a refractive surgical procedure, using a repeated measures design to assess satisfaction of patients who had LASIK and to correlate clinical outcomes with detailed measures of patient satisfaction to document long-term viability, monitor changes over time and patients’ functional abilities post-operatively. Method In the study 216 post-LASIK subjects were randomly selected from among patients who underwent simultaneous bilateral LASIK using the Chiron Technolas 217C plano-scan excimer laser with the Chiron ACS (Automated Corneal Shaper) and the Hansatome microkeratome. The subjects were recruited from within one centre, and the procedures were performed by any one of three surgeons. The study also included 100 non-LASIK subjects as a control group, to compare and differentiate ocular symptoms and visual difficulties between LASIK and non-LASIK patients. Clinical data documented included visual acuity, subjective refraction, record of glasses and/or contact lenses prescription, corneal topography with EyeSys and Orbscan, slit lamp examination, surgical details, and any pre-existing eye disease/conditions and previous surgery or injury that might prevent the subjects from achieving their desired visual outcome post-operatively. Subjective patient satisfaction evaluation of the treatment group was assessed by subjects completing a survey questionnaire at 3 months, 6 months, 12 months and 24 months post-operatively. The control group subjects completed a comparable questionnaire and were assessed at baseline and 3 months later. Because the control group subjects did not have any surgical alterations, it was unnecessary for them to have more than one follow-up. Results LASIK achieved relatively high patient satisfaction, with only a small number of dissatisfied patients. It was effective in correcting myopia, hyperopia and astigmatism. However, there was some persistent under-correction in myopic spherical and minus cylindrical refractive errors. Hyperopic spherical correction was less effective, as there were more under- as well as over-correction, and the plus cylindrical correction tended to be under-corrected. The LASIK subjects’ post-operative distance uncorrected visual acuity was not as good as their pre-operative best corrected visual acuity, but it did not significantly correlate with patient satisfaction. The findings were consistent with other studies and confirmed the concept that patient satisfaction is not unidimensional and is not related to outcome solely in terms of visual acuity and residual refractive errors. Other contributing factors included problems with glare, rating of unaided distance and near vision, ability to drive at night, change in ability to perform social/recreational, home and work activities, change in overall quality of life, amount of information given prior to surgery, rating of surgery success, and surgery outcome relative to pre-operative expectations. These variables demonstrated distinctive differences between subjects who were satisfied and dissatisfied. Conclusions The findings of this study are consistent with those of earlier studies. However, the repeated measures design and the comparisons between LASIK subjects and the control group revealed some new insights that were previously undocumented. LASIK achieved high patient satisfaction, and factors associated with satisfaction were predictable, but sources of dissatisfaction were more idiosyncratic and contributing factors were identified.
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Manendo, Trevor. "A Phylogenetic Analysis of North American Lasius Ants Based on Mitochondrial and Nuclear DNA." ScholarWorks @ UVM, 2008. http://scholarworks.uvm.edu/graddis/146.
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The ant genus Lasius (Formicinae) arose during the early Tertiary approximately 65 million years ago. Lasius is one of the most abundant and widely distributed ant genera in the Holarctic region, with 95 described species placed in six subgenera: Acanthomyops, Austrolasius, Cautolasius, Chthonolasius, Dendrolasius and Lasius. Many species of Lasius have been central to numerous species-level studies and the focus of many ecological, agricultural, and behavioral investigations. The focus of this study was to use molecular phylogenetic analysis of 781 base pairs of the mitochondrial gene cytochrome oxidase I (COI) and 251 base pairs of an anonymous nuclear gene (ANG) to address questions about the evolutionary relationships of North American Lasius species and subgenera. These relationships were used to better understand the biological and evolutionary complexities associated with these species given their North American distributions. The resulting hypotheses generated in this study from the analyses of these genes produced unexpected patterns of phylogenetic placement of Lasius species and subgenera. A number of biological processes alone or together could explain these patterns, including interspecific hybridization and gene introgression, incomplete lineage sorting, and the presence of multiple cryptic species.
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Zaune, Katharina. "Vergleichende Untersuchungen der Schnittdicke und Schnittqualität von LASIK-Mikrokeratomen." Diss., lmu, 2004. http://nbn-resolving.de/urn:nbn:de:bvb:19-28024.
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Feltham, Mark Hayes Optometry & Vision Science Faculty of Science UNSW. "Factors which affect refractive outcome following LASIK for myopia." Awarded by:University of New South Wales. School of Optometry and Vision Science, 2004. http://handle.unsw.edu.au/1959.4/20800.
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Purpose: To improve the predictability, accuracy and stability of laser in-situ keratomileusis (LASIK), by evaluating the clinical, procedural and tissue response factors that affect refractive outcomes. Methods: Myopic LASIK surgeries (n=5,978) were carried out using the Technolas planoscan and Nidek EC-5000 excimer lasers. Clinical variables associated with a refractive outcome of within ??0.50 D of the target were identified using regression analysis. Possible procedural variations such as the timing of the procedure and accuracy of both the chosen keratome and excimer laser were evaluated. The predictability and accuracy of the ablation was assessed by measuring changes in corneal thickness during and after the procedure. Factors influencing the stability of refractive outcome were assessed. Results: Clinical factors associated with a refractive outcome of within ??0.50 D of the target included; corrections less than 5.00 DS (OR 0.21x, 95% CI 0.11-0.40x compared with corrections over -5.00 DS[referent]), patients younger than 40 years (patients over 50 OR 8.27x, 95% CI 3.41-20.03x, patients 40 to 50 years OR 1.93x, 95% CI 0.96-3.90x, compared with patients under 40[referent]) and average pre-operative curvatures between 43.50 and 45.50D (OR 0.39x, 95% CI 0.18-0.83 compared with curvatures of less than 43.50D [referent]). Refractive stability was improved using optic zone sizes between 5.5-6.0 mm, reduced myopic corrections, flatter pre-operative corneal curvatures and thicker corneal flaps (R??=25%, p<0.001). Procedural factors associated with poorer outcomes included: thinner measured flap thickness, deeper ablations and the use of the automated corneal shaper (ACS) microkeratome with a novice surgical team (R??=34%, p < 0.001). Delaying the ablation from 20 to 90 seconds (s) after flap lift was associated with a more stable refractive outcome at three months (p=0.017). In the 90 s following flap lift, the cornea thinned by 5??3%. The ablation rate per scan varied between procedures, however, the effect on refractive outcome was small (r=0.15, p=0.267). Changes in central corneal thickness indicated refractive stability (p=0.039). Conclusions: Applying the optimal clinical and procedural factors as described afforded a refractive outcome in a further 8% of cases, resulting in 94% to 96% of cases within ??0.50 DS of target. Refractive predictability was limited due to the inability of the keratome to produce a consistent corneal flap thickness and unexpected changes in corneal thickness. The accuracy of refractive outcome will decrease with larger ablations. The degree of refractive inaccuracy with high refractive corrections (> -10.00 D) can be over 1.00 D.
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Marcolino, Cristiano da Silva. "LabSis : um ambiente para desenvovimento de aplicações sismicas Matlab." [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287064.
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Orientadores: Martin Tygel, Rodrigo PortugalDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica, Instituto de Geociencias
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Resumo: O pacote computacional Matlab é uma ferramenta de uso generalizado no meio acadêmico pelas suas vantagens de programação simples e direta e uso fácil de gráficos e visualizações, permitindo rapidamente implementações iniciais de algoritmos e procedimentos em uma série de aplicações. Em contrapartida às facilidades operacionais, os programas Matlab não possuem a eficiência computacional exigidas das linguagens de programação propriamente ditas (tais como Fortran e C, por exemplo). Tais propriedades fazem com que o Matlab seja, por excelência, um pacote de obtenção de "primeiras versões", dedicadas a testes em "problemas pequenos". Numa segunda etapa, os programas Matlab devem ser submetidos aos procedimentos de praxe da engenharia de software, incluindo a mudança de linguagem de programação para uso final em problemas práticos. Tal característica explica porque o Matlab seja tão utilizado na academia, em particular no ensino e elaboração de dissertações e teses. No caso específico do Laboratório de Geofisica Computacional da Unicamp, uma variedade de programas Matlab foi desenvolvida, visando aplicações ao ensino e a pesquisa de métodos de processamento de dados geofisicos, com ênfase aos métodos sísmicos. Devido aos focos específicos e sem muita conexão entre si, os programas foram desenvolvidos sem uma unidade de concepção, resultando na dificuldade de sinergia e utilização dos programas por um público mais amplo ou mesmo por outros alunos e usuários do próprio Laboratório. O LabSis, desenvolvido nesta dissertação, surge como um pacote integrador destas funções, utilizando as ferramentas gráficas do Matlab para criar uma interface simplificada e intuitiva ao usuário. O LabSis é formado por "funções casca", as quais fazem a ponte entre os algoritmos originais e o usuário. O uso destas funções casca libera o programador da tarefa de alterar as funções externas que compõem o LabSis, mantendo assim a filosofia dos autores dos programas originais. O fato de ter sido escrito totalmente em Matlab, toma o Labsis um software de código aberto, permitindo a qualquer programador a introdução de novas funções e programas. Uma vez que não é compilado em nenhum sistema específico, podendo assim ser executado em qualquer sistema onde o Matlab esteja instalado, toma o LabSis um software multi-plataforma. Construído para ser um pacote que englobe funções presentes e futuras, o LabSis contém, em sua versão atual, algoritmos (simples) de modelagem por traçado de raios, aproximação de Bom e integral Kirchhoff, análise de velocidades NMO, transformada T - P e análise de variação de amplitude com afastamento (AVO), migração Kirchhoffem profundidade e demigração Kirchhoff. O dado pode ser a qualquer momento visualizado através de uma feITamenta de "plotagem" de dados sísmicos. O programa permite ao usuário trabalhar com vários dados sísmicos ao mesmo tempo, sendo possível alternar entre eles a qualquer momento. O programa é totalmente gráfico, liberando o usuário de recorrer à linha de comando. No entanto essa opção existe, sendo útil para o caso de sucessivas repetições com ligeira variação de parâmetros. O LabSis é integrado com o pacote InterSis, um software também desenvolvido no Laboratório de Geofisica Computacional da Unicamp, e que consiste de uma interface gráfica para programas de modelagem de dados sísmicos. Com auxílio do InterSis, é possível gerar um modelo geológico e exportá-lo para o LabSis onde o mesmo é utilizado nas suas várias funções. Uma outra possibilidade é a utilização do InterSis para a modelagem de dados sísmicos e transferi-Ios para o LabSis para tarefas de processamento ou imageamento. A importação de dados no formato Seismic Unix (SU), bem conhecido na comunidade geofisica acadêmica e profissional, faz com que o LabSis possa se comunicar sem dificuldades com o mundo externo, permitindo a utilização de dados gerados por outros softwares. LabSis é um software didático, desenvolvido primordialmente para o ensino e a pesquisa, com o objetivo de tomar possível o entendimento e a verificação, na prática, de conceitos teóricos expostos em sala de aula. Tais características fazem com que o LabSis seja um atraente pacote para ser utilizado em cursos de graduação e pós-graduação. Por ser um programa leve, o LabSis não requer grandes exigências de máquina (a não ser que o dado utilizado assim o exija). Finalmente, o caráter integrador do LabSis permite sua utilização como plataforma unificada paras várias aplicações, em particular na área de modelagem e imageamento de dados sísmicos
Abstract: The Matlab package is a tool of widespread use in the academic environment, because of its advantages in simple direct programming, graphs and visualization tools. It allows initial implementations of algorithms and procedures very quickly in a series of applications. As a counterpar to the above good qualities, Matlab programs do not exhibit the computational efficiency that is found in typical programming languages (such as Fortran and C), as required for "final production codes". Such properties make the Matlab a package for "prototype codes". On a later stage, Matlab programs can be submitted to standard software engineering procedures, that contemplate a more adequate programming language for final use in practical problems. This characteristic of Matlab illustrates why it is so widely used in academia, especially for teaching and research purposes. In the specific case of the Laboratory of Computational Geophysics at Unicamp, a variety of Matlab programs have been developed in the last few years, mainly in the area of seismic data processing. Due to their very specific focus and lack of a common interface, the programs did not benefit from any conceptual unity that would allow more widespread application, even for users of the Laboratory. LabSis, developed in this thesis, appears as an integrator package of these functions, using the graphic tools of Matlab to create a simplified and intuitive interface for the user. LabSis is composed as a series of "wrapper functions", which make the bridge between the original algorithms and the final user. The employment of these wrapper functions frees the programmer from the task of altering the external functions that compose LabSis, maintaining the author's original program philosophy. The fact of being totally written in Matlab tums LabSis software an open source application, allowing any user to introduce new functions and programs. Since LabSis it is not compiled in any specific system (namely, it can be executed on any system where Matlab is installed), it also a multi-platform software. Built to be a package to include present and future functions, LabSis contains, in the current version, programs designed for modelling (using ray tracing, Bom and Kirchhoffmethods), NMO velocity analysis, computation of T - P transforms, amplitude versus offset (AVO) analysis, kirchhofftrue-amplitude migration and demigration. Visualization of results is always available by means of a tool that plots seismic data. The program allows the user to work simultaneously with several data sets, switching between them at any moment. The program is a graphical user interface (GUI) application. The user does not need to use command lines, however, that option exists, being useful for the case of successive repetitions with small variation of parameters. LabSis is integrated with the InterSis package, a software also developed at the Laboratory of Computational Geophysics of Unicamp, that consists of a graphic interface for seismic data modelling programs. With the aid of InterSis, it is possible to generate a geological model and export it to LabSis. Another possibility is to use InterSis to produce synthetic seismograms and transfer the datasets to LabSis for processing or imaging tasks. The possibility to import data in the Seismic Unix (SD) format, enables LabSis to communicate with the external world, allowing the use of data generated by other softwares. LabSis is a didactic software, specifically developed for teaching and research, with the aim of verifying in practice, many theoretical concepts exposed in the c1assroom. Such characteristics make LabSis attractive to Undergraduate and Graduate Programs that have geophysical data processing among their topics of interest. LabSis has not heavy requirements of computational speed or memory, unless the volume of data used demands it. LabSis integrated structure, makes possible its use as a small developrnent an communication platform to a wide range of users
Mestrado
Reservatórios e Gestão
Mestre em Ciências e Engenharia de Petróleo
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Wright, Philip John. "Population ecology of Lasius flavius F. on chalk grassland." Thesis, Goldsmiths College (University of London), 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394318.
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Lasius flavus F. is a common ant species on chalk grasslands in the south of England. This thesis examines the effects of the management regimes and environmental conditions of these grasslands, on the characteristics of the ant populations. The null hypothesis of the study was that the characteristics of L. flavus populations are not significantly affected by variation in: 1) management procedures, 2) the physical environment, 3) the biological environment. The ant populations, management regimes and environmental characteristics of twenty sample areas were investigated and subjected to intensive analysis to examine this hypothesis. The null hypothesis was rejected. The population of ants that an area of chalk grassland supports, depends on both the management of that area and the environmental conditions. In the short term (2 to 4 years) more intense management leads to significant reductions in the sizes of the soil mounds built by the ant colonies, and reductions in the sexual productivity and sexual investment ratios of the colonies. In the longer term (over 10 years) the density of mounds is also reduced. The most important environmental characteristic of the grasslands is the soil water regime. Drier areas support a lower density of colonies with smaller mounds. The numbers of root aphids (the major food source of the ant) are reduced by increased grazing intensity. Other invertebrate groups are also affected by the management regime and the physical environment of the sample areas.
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Raczkowski, Joseph Martin. "Phylogeny and founding stage of Lasius (Acanthomyops) (Hymenoptera: Formicidae)." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1221749471.
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Perkins, Anne Witt. "Learning and Study Strategies Inventory (LASSI): A validity study." W&M ScholarWorks, 1991. https://scholarworks.wm.edu/etd/1539618615.
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The purpose of this study was to examine the construct and predictive validity of the Learning and Study Strategies Inventory (LASSI). The LASSI is an instrument designed to assess utilization of learning and study strategies and methods for the purpose of measuring strategy use, diagnosing deficiencies, and prescribing intervention. The literature suggests that valid instruments of this type are sadly lacking. The LASSI User's Manual, however, presents no statistical evidence of instrument validity. The need for this verification became crucial with The College of William and Mary's selection of the inventory for administration to the 1990 freshman class. Using data obtained from this administration and a subsequent retest, statistical analyses were conducted to confirm instrument reliability and examine construct and predictive validity. Results indicated that while reliable, the ten LASSI scales possessed no construct validity, as measured by factor analysis, and low predictive validity when first semester college grade point average was the performance criterion. Until the completion of further research, the validity of the LASSI is at best suspect, and use of the instrument is not recommended.
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Goggin, Michael Joseph. "Outcome and complications of photorefractive keratectomy for myopia and astigmatism /." Title page, table of contents and aims only, 2003. http://web4.library.adelaide.edu.au/theses/09MS/09msg613.pdf.
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Reitt, Markus [Verfasser], Uta [Akademischer Betreuer] Lass, and Gerd [Akademischer Betreuer] Lüer. "Untersuchung kulturbedingter Kategorisierungspräferenzen bei chinesischen und deutschen Probandinnen und Probanden / Markus Reitt. Gutachter: Uta Lass ; Gerd Lüer. Betreuer: Uta Lass." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2013. http://d-nb.info/1044051736/34.
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Lass, Christoph [Verfasser]. "Homotopie-Methoden zum Lösen von Optimalsteuerungsproblemen / Christoph Lass." Greifswald : Universitätsbibliothek Greifswald, 2015. http://d-nb.info/1078385408/34.
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Scholtz, Sibylle [Verfasser]. "Vom Lesestein zur LASIK – die Geschichte der Sehhilfen / Sibylle Scholtz." Aachen : Shaker, 2006. http://d-nb.info/1170536530/34.
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De, la Cornillere Wendy-Lynne. "Participants’ experience of the Bishop Lavis Rehabilitation Centre stroke group." Thesis, Stellenbosch : University of Stellenbosch, 2007. http://hdl.handle.net/10019.1/1695.
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Thesis (MPhil (Interdisciplinary Health Sciences. Speech-Language and Hearing Therapy. Centre for Rehabilitation Studies))--University of Stellenbosch, 2007.Current emphasis for rehabilitation in South Africa remains on individual intervention within the move towards primary health care. Primary health care is the strategy that has been adopted by the South African department of health to bring access and equity in health care services. Even so, the burden of providing effective rehabilitative services with limited resources requires innovative strategies, such as the use of therapeutic groups, to address certain aspects of rehabilitation. These strategies must be proven effective. There is a paucity of literature detailing the uses of group therapy in physical rehabilitation, and particularly the use of interdisciplinary group work in stroke rehabilitation. Furthermore, evidence shows that stroke survivors feel ill equipped to return to their communities despite rehabilitation. Stroke is a major cause of death and disability in South Africa, and is a condition shown to benefit from rehabilitation. These factors led to the selection of the Bishop Lavis Rehabilitation Centre stroke group as the setting for this study, which aims to describe the range of experiences relating to attendance or non-attendance of those referred to this programme. This descriptive study, employing quantitative means (to describe the demographic details of the participants) and qualitative means (to describe the experiences of participants), was conducted with twenty participants. Data was collected by means of an administered questionnaire. Following that, a focus group discussion involving six participants was used to gather in-depth information. Quantitative data was analysed with the assistance of a statistician, utilising the computer program, Statistica. The Chi-Squared, Kruskal-Wallis and ANOVA tests were used, with p>0.05 showing statistical significance. Qualitative data was thematically analysed, whereby data was categorised by means of an inductive approach. The study population consisted of 20 participants, with an average age of 59 years, of whom 15 were female and five male. The stroke group provided meaning to participants on two levels. On a psychosocial level, the phenomena of universality (identifying with others in a similar position), development of socialising techniques, imparting information and cohesiveness emerged strongly. On the level of meaning related to stroke recovery, improvement in ability to execute activities of daily living, mobility and strength were most frequently mentioned. Transportation issues were most commonly mentioned as factors negatively influencing attendance. Staff attitude and activities of the programme were most often cited as positive factors. Given the positive response of study participants, and the programme’s ability to sustain intervention with limited resources, it was concluded that this programme has a valid place within stroke rehabilitation in Bishop Lavis. Recommendations in terms of the group programme included investigating methods of providing transportation, providing childcare facilities and expanding the content of educational sessions. Further recommendations were to maintain the positive attitude of staff and the current activities of the programme. Frequency of group outings should also be increased and compensatory strategies for inclement weather must be explored.
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Camphor, Freda Mary. "Unemployed youth in Bishop Lavis, Cape Town: Aspirations and capabilities." University of the Western Cape, 2018. http://hdl.handle.net/11394/6811.
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Magister Artium (Development Studies) - MA(DVS)This study took place in Bishop Lavis, a small community in Cape Town on the Cape Flats, Republic of South Africa. Stratified random sampling was used to select ten unemployed youths that resided in the area. The problem that prompted this investigation and that needed to be addressed was the high unemployment rate amongst the youth and how their aspirations and capabilities contribute to their state of well-being. This community is subjected to extreme poverty, inequality and gangsterism. This places a heavy burden on their ability to escape deprivation and the harsh realities of not ever being able to find a job. These inferior conditions in the community impact heavily on their quality of life. As the youths develop into maturity, their inability to enter the labour market deprives them of aligning their dreams, capabilities and aspirations to the new demands of the labour market. The study is based on the Capability Approach and it is used as an evaluative tool to assess the aspirations and capabilities of the participants. The objective of the study was to bring us closer to understanding how aspirations are developed and whether such aspirations can assist the youths in transforming their capabilities into a functioning. What we learned from this study was that the aspirations of youths failed to develop from an early age and their responsiveness to opportunities has to do with their value system and adaptation to their environment. This qualitative study required consent from the participants and ethical approval from UWC research structures. Through semi-structured interviews, information about the participants’ capabilities and aspirations were recorded and analysed. Based on this analysis and evaluation, new assessment model and assessment tools are proposed as an intervention strategy for policymakers.
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Gippet, Jérôme. "Patrons de distribution, dispersion par l’Homme et variations intraspécifiques au sein des paysages urbanisés : réponses des fourmis à l’urbanisation." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1286/document.
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L'urbanisation est un processus complexe tant par les mécanismes historiques, sociaux, économiques et environnementaux qu'il implique que par les multiples modifications qu'il provoque au sein des écosystèmes. Ainsi, les paysages urbanisés sont soumis à des changements spatialement et temporellement abrupts des conditions environnementales comme la température au sol et dans l'air, la fragmentation des habitats et les concentrations de divers polluants. Pourtant, malgré leur apparente inhospitalité pour la biodiversité, les milieux urbanisés sont de véritables écosystèmes où de nombreuses espèces, natives et invasives, sont capables de survivre et même de prospérer. L‟ « écosystème urbain » est désormais considéré comme un élément important du fonctionnement des environnements densément peuplés, de la santé et du bien être humain ainsi que de la conservation de la biodiversité. De manière plus fondamentale, l'urbanisation, au même titre que le changement climatique et les processus d'invasions biologiques, est une « expérience grandeur nature » nous offrant l'opportunité de comprendre les règles d'assemblage des communautés biologiques, les processus de sélection d'habitat et de dispersion ou encore les processus évolutifs d'adaptation et de diversification. Ce travail s'inscrit dans ce cadre de pensée en se proposant d'étudier les conséquences écologiques et évolutives de l'urbanisation à différents niveaux d'organisations biologiques chez les Formicidae. Cette thèse comprend 4 chapitres s'organisant autour des thèmes et questions suivants : Chapitre 1 : Urbanisation et communautés biologiques : Comment l'urbanisation affecte-t-elle la distribution des espèces à l'échelle du paysage ? Chapitre 2 : Urbanisation et dispersion par l'être humain : Conceptualisation et modélisation du rôle des activités humaines et des réseaux de transports dans la dispersion d'espèces. Chapitre 3 : Urbanisation et interactions biotiques : L'urbanisation affecte-t-elle les patrons de co-invasions d'un couple invasif hôte-parasite introduits indépendamment ? Chapitre 4 : Urbanisation et variations intraspécifiques : Les populations urbaines et rurales présentent-elles des différences de traits biologiques ? Nos résultats démontrent qu'en tant que changement multifactoriel, l'urbanisation affecte de manière complexe la composition des communautés biologiques en modifiant de manière idiosyncrasique la distribution des espèces natives et invasives. En effet, chacune des 7 espèces de fourmis étudiées était affecté par une combinaison unique de facteur environnementaux associés à l'urbanisation (p.ex. fragmentation des milieux ouverts, température de surface) mais également au climat (Chapitre 1, Gippet et al. 2016 Urban Ecosystems). Parce qu'ils concentrent des activités humaines, les paysages urbanisés sont le théâtre de multiples invasions biologiques. En effet, l'être humain déplace de nombreuses espèces, leur permettant de franchir des barrières biogéographiques mais aussi de se propager au sein des paysages. Afin de provoquer la discussion autour du concept de la dispersion des espèces par l'Homme, nous proposons un nouveau point de vue général centré sur les activités humaines (Chapitre 2, Partie 1, Gippet et al. soumis) ainsi qu'un modèle de propagation secondaire d'espèce invasive par les activités humaines : MoRIS, dont la principale innovation est d'utiliser la structure du réseau de transport pour influencer la direction des événements de dispersion (Chapitre 2, Partie 2, Gippet et al. In prep). La suite est à retrouver sur la version téléchargeable du manuscritUrbanization is a complex process involving simultaneous changes in several environmental conditions, including ground and air temperature (urban heat island effect), habitat fragmentation and chemical pollution. These changes are often associated with biodiversity loss and changes in ecosystems functioning. However, more than a sink for biodiversity, urban areas constitute true ecosystems where many native and alien species survive and even grow stable populations. The “urban ecosystem” is now considered as an important element in the functioning of densely populated environments, in human health and well-being, as well as in biodiversity conservation. More fundamentally, urbanization constitutes “real life experiment” offering ecologists an opportunity to better understand ecological and evolutionary processes over fine spatial and temporal scale. This thesis investigates ecological and evolutionary consequences urbanization at different biological organization levels using ants (Formicidae) as biological models. First, at the biological community level, we showed that native and alien ant responses to urbanization were species-specific as each species was affected by its own set of environmental changes associated with urbanization (e.g., fragmentation, ground temperature) and climate. Second, we explored the little studied process of human-mediated dispersal by (i) proposing a novel theoretical framework focusing on human activities rather than directly on species and (ii) developing an innovative simulation model of dispersal by transport in terrestrial landscapes, MoRIS (Model of Routes of Invasive Spread). Third, we investigated how urbanization affected novel biotic interactions between an alien ant species (Lasius neglectus), an alien ectoparasite fungus (Laboulbenia formicarum) and native ant species. We showed that urbanization impacted the size of L. neglectus colonies, which were smaller in urban area, as well as L. formicarum prevalence on L. neglectus, which was higher in urban areas. Finally, we investigated intraspecific variations between urban and rural conspecifics of an urban tolerant species: Lasius niger. We found that urban young queens were smaller and lighter, less stressed by high temperature and performed multiple mating more often than rural young queens. In common garden, colony founding success were globally similar but urban incipient colonies produced significantly less pupae (and consequently workers). We also found that workers produced in common garden experiments were more variable in size (higher head width variance in both inter- and intra-colony) in urban colonies than in rural colonies. No evidence for genetic differentiation between urban and rural populations was found, suggesting that gene flow was not disrupted between urban and rural populations. All our results converge to a renewed vision of ecological and potential evolutionary dynamics occurring in urban environments. Further investigation will be necessary to assess how ecological processes influence evolutionary trajectories in urban ecosystems, using both ecological (e.g. ant densities and abundances along the urban gradient) and genomic approaches (e.g. using “genotyping by sequencing” methods to identify genes responsible for adaptation to urbanization)
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Lass, Jan-F. [Verfasser]. "Untersuchungen zur Entwicklung einer magnesiumgerechten Strangpresstechnologie / Jan-F. Lass." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2015. http://d-nb.info/1069208159/34.
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Lass, Jan-Frederik [Verfasser]. "Untersuchungen zur Entwicklung einer magnesiumgerechten Strangpresstechnologie / Jan-F. Lass." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2015. http://nbn-resolving.de/urn:nbn:de:gbv:089-8185519092.
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Thomas, Scott James 1961. "Modeling and testing the LASI electromagnetic subsurface imaging systems." Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/282186.
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Three frequency-domain electromagnetic subsurface profiling systems have been developed which use frequencies from 30Hz to 30kHz, 1kHz to 1MHz, and from 30kHz to 30MHz respectively. The systems operate in the near-field and measure the ellipticity of the magnetic field. A grounded wire or a vertical magnetic dipole is used as the transmitter antenna. The receiving antennas consist of three mutually orthogonal antennas which are placed on the ground in an arbitrary orientation. Instead of performing rotations in three-dimensional complex space, a simple two-dimensional rotation operating in the complex plane is used to find ellipticity and relative tilt angle in three dimensions. Cross-talk between the receiver coils and corrections for coil misalignment are corrected using fixed coefficients. By employing cross-talk and coil misalignment corrections, coil-orientation invariance is achieved. Algorithms using one-dimensional computer modeling are developed to determine the expected minimum and maximum depths of penetration as a function of system noise and anomaly amplitude. Optimum target depth is computed from three-layer one-dimensional computer modeling and compares well with the magneto-telluric depth in the far-field. A large 100,000 gallon concrete-lined basin has been designed and constructed to perform full-scale physical modeling of the system response to various objects. The basin has been filled with water to simulate a conductive medium and a variety of targets have been submerged in the basin to simulate targets. Initial results indicate data can be collected from surveys over the basin to train neural networks. Trained neural networks can then perform real-time modeling during routine surveys.
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Yilmaz, Seval. "Untersuchung von Hornhautoberfläche und Hornhautbrechkraft nach LASIK zur Behandlung der Hyperopie /." Frankfurt a.M, 2008. http://opac.nebis.ch/cgi-bin/showAbstract.pl?sys=000259459.
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Abahussin, Mohammad. "Study of corneal ultrastructure in normal and post-LASIK human eyes." Thesis, Cardiff University, 2008. http://orca.cf.ac.uk/54709/.
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Laser
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Carrera, Betzabel Noemi Silva. "Estudo de propriedades de termoluminescência e ressonância paramagnética eletrônica de lapis lazuli." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-24062015-163152/.
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Lapis Lazuli é um mineral de silicato, que foi objeto do presente estudo. Trata-se de uma solução sólida complexa de outros quatro minerais de silicato, a saber: sodalita, noselita, huainita, e lazurita. Essa composição da solução sólida não permite estimar a porcentagem de cada mineral componente, no analise de fluorescência de raios X, onde se obteve que os principiais óxidos componentes do lapis lazuli são, (em % mol) SiO_2 (33,2), CaO (16,3), MgO (12,1) e Al_2 O_3 (10,1) e, em menor concentração , Na_2 O (6,10), SiO_3 (5,90), Fe_2 O_3 (2,05), K_2 O (1,90) e outros óxidos em concentrações menores. Para a caracterização da amostra de lapis lazuli, foram utilizados termoluminescência (TL), ressonância paramagnética eletrônica (EPR) e técnicas de espectroscopia de reflectância. Em TL, é claro, as curvas de emissão da amostra natural, irradiada ou com tratamento térmico têm sido utilizadas. Uma curva de emissão da amostra natural apresentou picos em 296°C e a 372°C , mas as amostras irradiadas mostraram picos em 140°C, 250°C e 350°C. Logo mostrou - se que o pico em 140°C, é na verdade, uma sobreposição dos picos em 116°C e 160°C. O segundo pico cresce linearmente com a dose até cerca de 7000-8000 Gy. O lápis-lazúli apresenta um decaimento anômalo. O primeiro pico decaiu a partir de 3400 (u.a) para 1700 (u.a), em 45 horas, o segundo pico decaiu a partir de 8500(u.a) para 3000 (u.a), nas mesmas 45 horas. Para a Avaliação da parâmetros E e s, o método de forma de pico e Tm- Tstop. O terceiro método com base em diversas taxas de aquecimento para a leitura TL, com a utilização direta do método resultou em valores de E e s irrealistas. Não se encontrou a explicação por que, mas ao fazer deconvolução das curvas de emissão para cada taxa de aquecimento encontramos resultados mais realistas. A deconvolução mostrou quatro picos em 110°C, 146°C, 191°C 245°C, com valores E, respectivamente iguais a 1,229 eV ; 1,23eV; 1,24eV e 1,25eV . O espectro de EPR da amostra experimental apresentou seis sinais de Mn^(2+) e um sinal grande de Fe^(3+) com g= 2,0. A irradiação da ordem de dezenas de kGy produzido um sinal em torno de g=2,003 devido ao centro em F induzido pela radiação. O espectro de refletância mostra um vale em torno de 600 a 800 nm, que corresponde a uma banda de absorção do mesmo comprimento de onda e é responsável pela coloração azul.Lapis Lazuli is a natural silicate mineral investigated in the present work. It is a complex solid solution of four other silicate minerals, sodalite, Nosean, Hanyne and Lazurite. This compositon of solid solution does not allow the estimate of the percentage of each mineral component from the result of X ray fluorescence analysis, which has revealed as main oxide components of lapis lazuli as (in mol % ) SiO_2 (33,2), CaO (16,3), MgO (12,1) and Al_2 O_3 (10,1) and in smaller concentrations Na_2 O (6,10), SiO_3 (5,90), Fe_2 O_3 (2,05), K_2 O (1,90) plus others in even smaller concentration. For the characterization of the lapis lazuli sample, we used thermoluminescence (TL), electronic paramagnetic resonance (EPR) and reflectance spectroscopy techniques. In TL, of course, glow curves of natural or irradiated or annealed samples have been used.\\\\ A typical glow curve presented peaks at 296.5°C and at 372°C, but irradiated sample has shown peaks at 140°C, 250°C and 350°C. Later it was shown that 140 °C peak is actually a superposition of 116°C and 160°C peaks. The second peak is the prominent one and its height grows linearly with the dose up to about 7000 to 8000 Gy. Lapis lazuli presents an anomalous fading. The first peak decays from 3400 (a.u.) to 1700 (a.u.) in 45 hours, the second peak decays from 8500 (a.u.) to 3000 (a.u.) in the same 45 hours. For the evalution of parameters E and s, peak shape method and Tm-Tstop methods have been used. The third method based on various heating rates for TL reading, with the direct use of method yielded unrealistic E and s values. We did not find explanation why, but doing the deconvolution of glow curves for each heating rate we found more realistic results. The deconvolution has shown four peaks at 110°C, 146°C, 191°C ands 245°C with E-values, respectively equal to 1.229eV, 1,23eV, 1.24eV and 1,25 eV. The EPR spectrum of natural sample consisted of six signals of Mn^(2+) and strong Fe^(3+) signal at g=2,0. The irradiation of the order of tens of kGy produced a signal around g=2,003 due to radiation induced F-center. The reflectance spectrum shows a dip around 600- 800nm which corresponds to an absorption band of the same wavelength and is responsible for blue colour.
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Depickere, Stéphanie. "Etude des dynamiques et des mécanismes de l'agrégation dans les soviétés de fourmis, en particulier chez lasius niger (L. )." Paris 13, 2003. http://www.theses.fr/2003PA132011.
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Colling, Amber J. "A comparison of three methods of measuring central corneal thickness in normal and thinned corneas." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1275058650.
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Slama, Dirk [Verfasser], Rüdiger [Akademischer Betreuer] Zarnekow, Heiner [Akademischer Betreuer] Lasi, Rüdiger [Gutachter] Zarnekow, and Heiner [Gutachter] Lasi. "IgniteWorx: Design and evaluation of a system-supported methodology for IIoT project setup / Dirk Slama ; Gutachter: Rüdiger Zarnekow, Heiner Lasi ; Rüdiger Zarnekow, Heiner Lasi." Berlin : Technische Universität Berlin, 2019. http://d-nb.info/1201725208/34.
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Dunkel, Sharon Lynn. "Displacement and redemption in the Lais of Marie de France." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28040.
Full textAbstract:
In the endless cycle of life and death, the issues of love and marriage are a constant and recurrent theme of literature. The man, as a foreigner, comes to court the woman with the intent of taking her away from her parents and bringing her into his own home. He must first convince the woman to leave the paternal location. The hearth, the center of the new home and the symbol of his wife, constitutes the one constant and stable aspect of the man's otherwise nomadic existence. The tensions and conflict inherent in this masculine struggle serve to mold and prepare the man for his future role as the protector and provider of his home and society.
The woman, for her part, must also undergo -a spatial displacement. Not only must she travel to the new domicile, but she must also be prepared to change and adapt herself to the idea of leaving her birthplace. The vertical movement from the tower to the grove by way of the bedroom constitutes the process of maturation for the lady. Once she has proven herself capable of adulthood, the woman will assist her mate in gaining access to the society he had originally rejected in his search for self. Thus the woman serves as the instrument of God in redeeming the man while maintaining her own individuality, seen in the parallel process of displacement which she experiences. The reader response to the text of the Lais is based upon the realization that the reader also experiences a type of spatial displacement similar to that of the protagonists. Marie, through the use of a variety of literary mechanisms, forces the recipients of the text to go back in time and space to the mythic locale of Bretaigne. The purpose of this narrative technique is that, through identification with the various characters, each reader learns the proper methods of social interaction. In other words, the twelve stories form a manual of courtly etiquette.
The Lens of Marie de France are not only for entertainment but for edification as well.Arts, Faculty of
French, Hispanic, and Italian Studies, Department of
Graduate
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Lass, Dennis [Verfasser], and Wittko [Akademischer Betreuer] Francke. "Phytochemische Untersuchungen an einheimischen Baumpilzen / Dennis Lass. Betreuer: Wittko Francke." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2013. http://d-nb.info/1035503964/34.
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Roussel, François-Gabriel. "L'éthique amoureuse dans les lais des XIIe et XIIIe siècles." Paris 3, 1985. http://www.theses.fr/1985PA03A107.
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Hessenauer, Matthias. ""La Lumière as lais" : Pierre de Peckhams Vermittlung scholastischer Theologie /." Wiesbaden : L. Reichert, 1989. http://catalogue.bnf.fr/ark:/12148/cb35712583v.
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Zahn, Ulrike. "Liebeskonzeption und Erzählverfahren in den Lais der Marie de France /." [S. l.] : [s. n.], 1987. http://catalogue.bnf.fr/ark:/12148/cb39909668m.
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Varghese, J. (Jobin). "MoO₃, PZ29 and TiO₂ based ultra-low fabrication temperature glass-ceramics for future microelectronic devices." Doctoral thesis, Oulun yliopisto, 2019. http://urn.fi/urn:isbn:9789526222172.
Full textAbstract:
Abstract This thesis describes a detailed investigation of new glass 10Li₂O−10Na₂O−20K₂O−60MoO₃ (LNKM), ceramic (α-MoO₃) and ceramic-commercial glass (PZ29-GO17, rutile TiO₂-GO17) composites to satisfy the future requirements for ultra-low fabrication temperature materials and their associated processes. The initial part of the thesis is devoted to the development of the LNKM glass by a glass-melting and quenching process, followed by an investigation into its structural, microstructural and microwave dielectric properties. The prepared glass had ultra-low glass transition and melting temperatures of 198 and 350 °C, respectively. The glass pellet heat-treated at 300 °C had a relative permittivity (εr) of 4.85 and a dielectric loss (tan δ) of 0.0009 at 9.9 GHz. The temperature dependence of the relative permittivity was (τε) 291 ppm/°C. Another part of the work concerns α-MoO₃ ceramic, its preparation by uniaxial pressing and sintering at 650 °C followed by an investigation of its structural, microstructural, thermal and microwave dielectric properties. It had an εr of 6.6, tan δ of 0.00013 (at 9.9 GHz) and τε of 140 ppm/°C. In addition to this, a functional ultra-low temperature co-fired composite was developed based on commercial PZ29 and 50 wt.% of GO17 glass followed by tape casting and co-firing with Ag at 450 °C. The average values of the piezoelectric (d₃₃) and voltage (g₃₃) coefficients were 17 pC/N and 30 mV/N, respectively. The sintered sample had an average CTE value of 6.9 ppm/°C measured in the temperature range of 100–300 °C. The εr and tan δ of the sintered substrates were 57.8 and 0.05 at 2.4 GHz, respectively. Additionally, a new ceramic-glass composite was developed using rutile TiO₂-GO17, and co-fired with Ag at 400 °C. It had an average CTE value of 8.3 ppm/°C measured in the temperature range of 100–300 °C. This composite substrate showed εr of 15.5 and tan δ 0.003, at 9.9 GHz. Moreover, it also had τε of -400 ppm/°C at 9.9 GHz measured in the temperature range of −40 to 80 °C. The findings of the thesis reveal the feasibility of the ultra-low temperature co-fired ceramic (ULTCC) technology for high-frequency telecommunication devices as well as for electronics packages. Additionally, a first step to develop functional ULTCC has been takenTiivistelmä Tässä väitöskirjassa kuvataan uuden lasin 10Li₂O−10Na₂O−20K₂O−60MoO₃ (LNKM), keraamin (α-MoO₃) sekä keraami-lasi (PZ29-GO17, rutiili TiO₂-GO17) komposiittien tutkimustulokset, jotka mahdollistavat tulevaisuuden sähkökeraamisten materiaalien ja komponenttien valmistuksen ultra-matalissa valmistuslämpötiloissa. Väitöskirjan alkuosa keskittyy LNKM lasin kehitykseen lasin sulatus- ja karkaisuprosessilla, sekä tämän materiaalin mikrorakenteen sekä mikroaaltoalueen dielektristen ominaisuuksien tarkasteluun. Valmistetulla lasilla oli ultra-matala lasittumislämpötila 198 °C sekä sulamislämpötila 350 °C. Lasipelletin, joka lämpökäsiteltiin 300 °C:ssa, suhteellinen permittiivisyys (εr) oli 4,85 ja dielektriset häviöt (tan δ) 0,0009 9,9 GHz taajuudella. Suhteellisen permittiivisyyden lämpötilariippuvuus (τε) oli 291 ppm/°C. Toinen osa työtä käsittelee α-MoO₃ keraamia, josta valmistettiin näytteet mikrorakenne ja mikroaaltoalueen dielektristen ominaisuuksien tutkimuksiin aksiaalisella puristuksella ja sintraamalla 650 °C:ssa. Valmistetun materiaalin suhteellinen permittiivisyys oli 6,6, häviöt 0,00013 (9,9 GHz:ssa) ja permittiivisyyden lämpötilariippuvuus 140 ppm/°C. Näiden lisäksi kehitettiin toiminnallinen ultra-matalan lämpötilan yhteissintrattu komposiitti perustuen kaupalliseen pietsosähköiseen keraamiin (PZ29) ja lasiin (GO17). Komposiitista valmistetiin monikerrosrakenne nauhavalulla ja yhteissintraamalla hopeaelektrodien kanssa 450 °C:ssa. Keskimääräiset arvot pietsosähköiselle varausvakiolle (d₃₃) sekä jännitevakiolle (g₃₃) olivat 17 pC/N ja 30 mV/N. Sintratun näytteen keskimääräinen lämpölaajenemiskerroin oli 8,3 ppm/°C lämpötila-alueella 100–300 °C. Tämän komposiittisubstraatin suhteellinen permittiivisyys oli 15,5 ja häviötangentti 0,003 9,9 GHz:n taajuudella. Lisäksi suhteellisen permittiivisyyden lämpötilariippuvuus oli -400 ppm/°C samalla 9,9 GHz:n taajuudella, kun lämpötilan mittausalue oli −40–80 °C. Tämän väitöstyön tulokset osoittavat ultra-matalan lämpötilan yhteissintrattavan keraamiteknologian (ULTCC) soveltuvuuden korkean taajuuden tietoliikennesovelluksiin ja elektroniikan pakkausteknologiaan. Lisäksi työssä on otettu ensimmäiset askeleet funktionaalisten ULTCC materiaalien kehittämiseksi
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Githaiga, Nyambura. "Building Peace that Lasts: A Study of State-Led Peacebuilding in Kenya." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/35664.
Full textAbstract:
The concept of peacebuilding evokes the image of international interventions in countries emerging from civil wars. Despite the visibility of this engagement, post-civil war peacebuilding is just one form of peacebuilding. As a response to smaller scale violent conflicts, ongoing peacebuilding interrupts cycles of violence and prevents the escalation of violent conflict. The 2007/8 post-election violence in Kenya captured international attention due to the scope and magnitude of the conflict. In 1992 and 1997, Kenya had experienced lower levels of electoral violence. The recurring and escalatory nature of violent conflict implies that peacebuilding should be a strategic response, earlier on, to prevent violence from reaching new levels. Since 2002, the Kenyan state has actively engaged in peacebuilding. This study on state-led peacebuilding in Kenya deviates from the typical post-war interventions to analyse peacebuilding as an ongoing preventative response by national actors to intermittent violence.
This thesis seeks to explain the impact of this state-led peacebuilding approach on the practice and prospect of peace. To do so, I first explore the multiple conceptions of peace held by those engaged in this approach to understand what type of peace is being built. Second, I analyse the paradox of the state in peacebuilding and how the role of the state has influenced the nature of peacebuilding and consequently the prospects for peace. The state in peacebuilding presents a paradox because of the state’s direct and indirect involvement in violent conflict as well as the top-down nature of state engagement. Third, I interrogate the relationship between the institutionalisation of peacebuilding and the sustainability of peacebuilding and peace. I find that state-led peacebuilding in Kenya has raised the profile of peacebuilding, improved the synergy between peacebuilding actors and increased the inflow of resources available to build peace. This positive influence is countered by the negative implications of the state’s role in promoting a reductive conceptualisation of peace and unsustainably institutionalising peace building. I conclude that, though the state has a role to play in peacebuilding, the contradictory implications of state-led peacebuilding challenge the sustainability of peacebuilding and peace.
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Mailleux, Anne-Catherine. "Les Règles de comportements à l'origine des stratégies alimentaires chez Lasius niger." Doctoral thesis, Universite Libre de Bruxelles, 2002. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211473.
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Peters, Simone Maxine. "Researching Race, Space and Masculinities in Bishop Lavis: A Critical Ethnographic Study." Doctoral thesis, Faculty of Humanities, 2021. http://hdl.handle.net/11427/33729.
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Research done on ‘coloured' men and communities have problematized ‘coloured' masculinities and communities. Studies showed ‘coloured' men to be the most likely to perpetrate violence and rape. These studies further suggest that violence, drug abuse, gangsterism and alcoholism are a prominent feature of ‘coloured' communities, one such community being Bishop Lavis. Such narratives have led to this complex group of people and their communities being reduced to negative stereotypes. This research aimed to showcase more holistic and alternative narratives on Bishop Lavis, its community and ‘coloured' identities through a critical ethnographic methodology. Multiple methods to collect the data was utilised, namely narrative interviews with eight community stakeholders and six older men (aged 35 and above). Additionally, a Photovoice method was used with six men (aged 18 to 34), where a focus group, individual narrative interviews, and visual (photographs) and narrative data were collected. The data was analysed using multiple theoretical frameworks and data analysis tools to highlight the complexities of the participant's lived experiences. The results found that participants used their talk to challenge dominant narratives that exist on ‘coloured' men and communities and confirm and reproduce stigmatised narratives . Furthermore, it was found that race, location, gender, class and other identities intersected to produce particular experiences for the participants.
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Lam, Wing-wah Phoebe. "A systematic review of postoperative treatments for laser eye surgery." Hong Kong : University of Hong Kong, 2002. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25549686.
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Puig, Galy Javier José. "Uso de biópticos (ICL y Lasik) para la corrección de la alta miopía." Doctoral thesis, Universitat Autònoma de Barcelona, 2001. http://hdl.handle.net/10803/4233.
Full textAbstract:
OBJETIVOS: Determinar la eficacia, predictibilidad, estabilidad y seguridad de la cirugía refractiva mediante "Biópticos" (combinación del implante de una lente fáquica de cámara posterior y láser in situ queratomileusis) en pacientes afectos de altas miopías.
Describir el procedimiento quirúrgico y mostrar los resultados visuales y refractivos del mismo.
MATERIAL Y MÉTODOS:
Hemos analizado 102 ojos de 63 pacientes afectos de alta miopía, intervenidos mediante el implante de una lente fáquica de cámara posterior tipo ICLTM y láser in situ queratomileusis (Lasik).
El seguimiento postoperatorio medio fue de 19 meses (rango: 12-36 meses).
RESULTADOS:
El equivalente esférico medio preoperatorio fue de -18,20 ± 4,21 D., con un astigmatismo medio asociado de -1,87 ± 1,57 D. La media aritmética del equivalente esférico tras implantar la lente fáquica y antes de realizar el Lasik fue de -2,59 ± 2,04 D. El equivalente esférico medio tras el procedimiento Bióptico completo resultó ser de -0,28 ± 0,33 D., con un cilindro medio de -0,53 ± 0,35 D.
El 100% de los pacientes se encontraban postoperatoriamente en el rango de ± 1,00 D. respecto a la emetropía, mientras el 95,09% lo hacían en el rango de ± 0,50 D.
Las refracciones postoperatorias se mantuvieron estables durante los sucesivos controles, sin cambios estadísticamente significativos.
La agudeza visual sin corrección mejoró en todos los casos. La agudeza visual corregida se mantuvo igual o mejoró postoperatoriamente en todos los casos excepto en dos. La media de ganancia de agudeza visual corregida postoperatoria fue de dos líneas de Snellen.
Todos los pacientes se mostraron muy satisfechos con los resultados obtenidos.
DISCUSIÓN:
El uso combinado de lentes fáquicas de cámara posterior tipo ICLTM y Láser in situ queratomileusis (Lasik) constituye un método efectivo y predecible para corregir la alta miopía.
Es frecuente la mejoría postoperatoria de la agudeza visual corregida de estos pacientes. Los resultados muestran una considerable seguridad del procedimiento a corto y medio plazo, así como una gran estabilidad refractiva.
PURPOSE:
To determine the efficacy, predictability, stability and safety of "Bioptics" refractive surgery (combined posterior chamber phakic intraocular lens implantation and laser in situ keratomileusis) in eyes with extreme myopia.
To report the technique and to assess the results (refraction and visual acuity) of this surgical procedure.
MATERIAL AND METHODS:
We analyzed the results of 102 eyes that received a posterior chamber hydrogel-collagen plate phakic IOL (ICLTM) and also underwent secondary Lasik for the correction of extreme myopia.
Mean follow-up was 19 months after the Lasik procedure (range 12 to 36 months).
RESULTS:
Mean preoperative spherical equivalent refraction was -18,20 ± 4,21 D., and mean refractive cylinder was -1,87 ± 1,57 D. Mean spherical equivalent refraction after IOL implantation and before Lasik was -2,59 ± 2,04 D. Mean postoperative spherical equivalent refraction one year after the Lasik portion of the double Bioptics procedure was -0,28 ± 0,33 D., and mean refractive cylinder was -0,53 ± 0,35 D.
One hundred percent were within ± 1,00 D. and 95,09 % were within ± 0,50 D. of emmetropia at last examination.
The refractions remained stable with a statistically insignificant change during follow-up.
Uncorrected visual acuity improved in all cases. Best spectacle-corrected acuity remained the same or improved in all but two cases. Mean best spectacle-corrected acuity gain after the double procedure was two Snellen lines.
Patient satisfaction with the final visual outcome was very high.
CONCLUSIONS:
Combined posterior chamber phakic IOL implantation with ICLTM lens and Lasik (Bioptics) is an effective and reasonably predictable method for correcting high myopia.
Gains in spectacle-corrected visual acuity were common, and results demonstrated good short-medium term safety and refractive stability.