<p>In forensic investigations, verification of digital recordings is an important as-pect. There are numerous methods to verify authentication of recordings, but itis difficult to determine when the media was recorded. By studying the electricalnetwork frequency, one can find a unique signature and then match the recordingto this signature. By matching a recorded signal to a database, which contains allnecessary information, one can find the time when the recording was made.</p>

In forensic investigations, verification of digital recordings is an important as-pect. There are numerous methods to verify authentication of recordings, but itis difficult to determine when the media was recorded. By studying the electricalnetwork frequency, one can find a unique signature and then match the recordingto this signature. By matching a recorded signal to a database, which contains allnecessary information, one can find the time when the recording was made.

Authentication of recordings is an important task in forensic sciences. When processing audio or video material, some tasks might be related to determining whether or not the material has been edited or falsified in any way, or in other cases, to determine at what point in time a recording was made. The transition from analog to digital media has provided a solid foundation for the process of determining recording times by using the frequency variations in the electrical network, when interferences from the network are present in the investigated recording. This thesis describes a method of how to record the frequency of the electrical network in order to establish a reference database, evaluates several methods to isolate and extract the disturbances from recordings as well as suggests methods of how to search the database in order to locate the time of a recording. It is concluded, that each of the methods suggested has both advantages and disadvantages, depending on the state of the examined recording. Tests are also conducted in order to determine, whether or not, battery powered recording equipment is susceptible to recording the disturbances, or harmonics thereof, from electromagnetic fields near conducting wire or other electrical equipment. It is found that the fundamental frequency disturbance is usually difficult to detect, but also, that it is not uncommon that harmonics can be present in the recordings from the battery powered devices tested. Included in this thesis are also the results of the development of a graphical user interface for Matlab, where some of the features include the possibility to filter sound files, estimate frequency patterns and perform database searches, as well as the evaluation of a frequency analysis software. Both intended to serve as an aid for locating and extracting the disturbances of interest, as well as for finding the corresponding frequency patterns in the established database.

Cette thèse concerne l'analyse de propagation de dommages dans une structure hybride métal/composite assemblée par collage structural. L'approche choisie est basée sur l'identification expérimentale du taux de restitution d'énergie, G, pour une sollicitation en mode I et II. L'éprouvette de type DCB (Double Cantilever Beam), qui a d’abord été adaptée pour être représentative de la structure hybride, permet de construire la R-Curve (évolution de G en fonction de la longueur de fissure, a) et d'étudier la cinétique de propagation de fissure sous sollicitations dynamiques. La même étude a été portée sur l’éprouvette ENF (End Notched Flexure). Une machine d’essais a été créée afin de réaliser les essais quasi-statiques et dynamiques. Un caisson thermique a été conçu pour faire des essais en température et regarder son impact sur les propriétés de la mécanique de rupture des adhésifs. L'originalité de ce travail est le pilotage des essais dynamiques à ΔG imposé, ce qui permet de s'affranchir de la dépendance de G à la longueur du dommage pour le mode I.Les résultats obtenus mettent en évidence les variations des vitesses de propagation (da/dN) à différentes conditions environnementales en mode I et II sur des assemblages composite/métal collés. / This thesis explains the analysis of damage propagation in a metallic/composite hybrid structure, assembled with structural adhesives. The chosen approach is based on the experimental identification of the energies release rates for a solicitation in mode I and II. The DCB (Double Cantilever Beam) specimen, which design was first adapted in order to adequately represent the hybrid structure, allows the construction of the R-Curve (evolution of G versus the crack length, a) and the study of the crack speed propagation under dynamic solicitations. The same study was carried out on the ENF specimen (End Notched Flexure).A testing machine was created in order to perform quasi-static and dynamic tests. A thermal chamber was designed to carry out temperature tests and observe the impact of the latter on the fracture mechanics properties of the adhesives. Performing dynamic tests with an imposed ΔG, which allows one to overcome the dependence of G to the damage length in mode I, is what makes this work original.The obtained results highlight the variation of the speed propagation in different environmental conditions, for mode I and II, on composite/metal bonded assemblies.

The behaviour of spot welded joints is to be studied in shear mode by using the end notched flexure (ENF) specimen. The specimen counts on several spot welds spaced with the same gap along the entire length except for the notch. Different configurations of the test specimen spacing gap and spot diameter are to be preliminary designed in software PTC-CREO 2.0 in order to obtain accurate results. The results obtained from the software are to be compared with the experimental analysis performed by means of a servo-hydraulic testing machine. Both the virtual and the experimental results will be used to extract the stress-shear displacement relation around the first spot weld which is in contact with the notch, that is, the corresponding cohesive law. In addition, a comparison between adhesive and spot weld behaviours will be carried out by means of analytical equations in order to prove an existing equalisation between each other. Despite assuming several sources of error and after facing some problems related to the experimental work, accurate convergences between experimental and theoretical results were not accomplished in any of the three tests performed in lab. Due to the plastic deformation of the specimens in lab, the cohesive law was possible to be extracted only from the theoretical analysis, but not from the experimental one. In its place, the load-shear displacement was extracted. Some alternatives to solve this issue and to improve the performance of the tests are given at the end of this paper.

Orientador: Elenice Deffune / Banca: Marcos Andrey Cipriani Frade / Banca: Luciana Patrícia Abbade / Resumo: O hemocomponente gerador da cola de fibrina home made é a fração do plasma fresco congelado. Neste os fatores I (fibrinogênio), VIII, XIII, von Wilebrand e fibronectina estão presentes em elevada concentração. O fibrinogênio, fator I da coagulação sangüínea, sofre ativação nos processos de injúria tecidual onde são desencadeados os fenômenos hemostáticos que culminam com a formação de uma rede resistente de fibrina na qual existem leucócitos, hemácias e plaquetas. O gel de plaquetas é um hemocomponente obtido a partir de concentrado de plaquetas ou de plaquetaféres com adição de gluconato de cálcio e trombina e tem sido alvo de muitos estudos na última década sua participação no processo de cicatrização, especialmente porque libera fatores de crescimento no leito de feridas promovendo a reparação fisiológica tecidual. Neste estudo avaliou a ação de curativos bioativos home made: células tronco mesenquimais incorporadas ao gel de plaquetas laminares com laserterapia, no processo de cicatrização de feridas crônicas. Foram avaliados feridas crônicas em membros inferiores, de 5 pacientes, sendo predominantemente feridas decorrentes de seqüelas de hanseníase. O gel laminar de plaquetas mostrou-se ser um promissor meio de microencapsulação de células tronco mesenquimais, fibroblastos e queratinócitos. Nas feridas tratadas com células tronco mesenquimais, incorporadas ao gel laminar de plaquetas, foi observada melhora clínica considerável, tanto na cicatrização, quanto na redução das manifestações inflamatórias e dolorosas, nos 5 pacientes / Abstract: The blood components of fibrin glue generator home made is the fraction of fresh frozen plasma. In the factors I (fibrinogen), VIII, XIII, von Wilebrand and fibronectin are present in high concentration. Fibrinogen, blood coagulation factor I, undergoes activation in the processes of tissue injury where the phenomena are triggered hemostatic culminating in the formation of a strong fibrin network in which there are leukocytes, red blood cells and platelets. The platelet gel is a blood components obtained from platelet concentrate with the addition of calcium gluconate and thrombin and has been the subject of many studies over the last decade due to their involvement in the healing process, especially because it releases factors growth in the wound bed to promote the physiological tissue repair. This study evaluated the action of bioactive dressings home made: mesenchymal stem cells embedded in the laminar platelet gel with laser therapy in the healing of chronic woundsChronic wounds were evaluated in the lower limbs of five patients, predominantly due to wounds sequelae of leprosy. The laminar platelet gel showed to be a promising be means of microencapsulation of mesenchymal stem cells, fibroblasts and keratinocytes. In wounds treated with mesenchymal stem cells embedded in the laminar platelet gel, significant clinical improvement was observed both in healing and in reducing inflammatory and painful manifestations in 5 patients / Mestre

abstract: This research summarizes the validation testing completed for the material model MAT213, currently implemented in the LS-DYNA finite element program. Testing was carried out using a carbon fiber composite material, T800-F3900. Stacked-ply tension and compression tests were performed for open-hole and full coupons. Comparisons of experimental and simulation results showed a good agreement between the two for metrics including, stress-strain response and displacements. Strains and displacements in the direction of loading were better predicted by the simulations than for that of the transverse direction. Double cantilever beam and end notched flexure tests were performed experimentally and through simulations to determine the delamination properties of the material at the interlaminar layers. Experimental results gave the mode I critical energy release rate as having a range of 2.18 – 3.26 psi-in and the mode II critical energy release rate as 10.50 psi-in, both for the pre-cracked condition. Simulations were performed to calibrate other cohesive zone parameters required for modeling. Samples of tested T800/F3900 coupons were processed and examined with scanning electron microscopy to determine and understand the underlying structure of the material. Tested coupons revealed damage and failure occurring at the micro scale for the composite material. / Dissertation/Thesis / Masters Thesis Civil, Environmental and Sustainable Engineering 2018

This thesis focuses on problematics of fracture mechanics. It aimes to comprehensively explain theoretical knowledge in both Czech Republic and abroad, where a research of this field is taken more often. Based on theoretical research best way to determine fracture toughness was selected. For this purpose three sets of spruce specimens (using three different adhesives) were created and tested by 3ENF test under the mode II while being monitored by digital image correlation method. From these values strain release rate energy and fracture toughness of tested specimens were determined. The thesis compares found data and analyses their correlations.

Made available in DSpace on 2014-07-29T15:04:35Z (GMT). No. of bitstreams: 1 Heliane Fernandes Lourenco Santos.pdf: 3020264 bytes, checksum: a7e1539c84e1a7748f8b59f145cea8c0 (MD5) Previous issue date: 2011-05-27 / INTRODUCTION: The policy of humanization of prenatal care, labor and delivery within the Health System recommends actions that should guarantee women the benefits of scientific advances, and ultimately, allow and encourage the practice of female citizenship, rescuing empower women in the process parturitivo, ensuring privacy, easy access to consultations and examinations, information and procedures proven beneficial. Avoiding unnecessary interventions, sharing with the mother decisions on measures to be adopted and establishing relationships based on ethical, social and professional (MINISTRY OF HEALTH, 2006). The study aims to analyze the adoption of standards of humane care to prenatal care, labor and birth, from the perspective of women served by the Health System in Goiânia, Goiás METHODOLOGY: A descriptive and exploratory qualitative approach. Data collection took place from May to July 2010 in Goiânia, Goiás For data collection we used semi-structured interview. RESULTS: The profile of the subjects were 21 pregnant women aged 18-31 years, most had high school, lived in a stable income and a minimum wage. Were prepared two thematic categories: Pre-natal care and childbirth and birth. It was found that prenatal was easy access to exams and the Family Health Strategy. However the Centers for Integral Health was difficult to access appointments. It found no or little information about the process parturitivo prevailed and the will or medical decision in choosing the type of delivery. During labor and delivery practices walking, freedom of position, power and right to analgesia were less evident, the right of the accompanying family is still not respected. Breastfeeding was encouraged after birth, rooming-in was seen as a place of abandonment and loneliness. The perception of the mother and birth care in the public health data direct to lack of education of health professionals. CONCLUSION: The data pointed to situations such as difficult access to prenatal care, lack of conduct and procedures to be adopted, absence of women's participation in decision making and lack of support in childbirth, situations that contradict with the policy advocated by humanizing prenatal care, labor and birth. / INTRODUÇÃO: A política de humanização da assistência ao pré-natal, parto e nascimento no âmbito do Sistema Único de Saúde preconiza ações que deve garantir à mulher os benefícios dos avanços científicos, e fundamentalmente, permitir e estimular o exercício da cidadania feminina, resgatando a autonomia da mulher no processo parturitivo, garantindo a privacidade, o fácil acesso a consultas e aos exames, a informação e, procedimentos comprovadamente benéficos. Evitando-se intervenções desnecessárias, compartilhando com a gestante as decisões sobre condutas a serem adotadas e estabelecendo relações baseadas em princípios éticos, sociais e profissionais (MINISTÉRIO DA SAÚDE, 2006). O estudo tem por objetivo analisar a adoção das normas de assistência humanizada ao pré-natal, parto e nascimento, sob a ótica das mulheres atendidas pelo Sistema Único de Saúde, em Goiânia, Goiás. METODOLOGIA: Estudo descritivo e exploratório de abordagem qualitativa. A coleta de dados se realizou no período de maio a julho de 2010 em Goiânia, Goiás. Para coleta de dados utilizou-se entrevista semi-estruturada. RESULTADOS: O perfil dos sujeitos foram 21 parturientes com idade entre 18-31 anos, a maioria tinha ensino fundamental, vivia em união estável e renda um salário mínimo. Elaboraram-se duas categorias temáticas: Assistência pré-natal e O parto e nascimento. Identificou-se que no pré-natal foi fácil o acesso aos exames e consultas na Estratégia Saúde da Família. Entretanto nos Centros de Atenção Integral a Saúde houve dificuldade de acesso às consultas. Constatou-se ausência ou pouca informação acerca do processo parturitivo e preponderou à vontade ou decisão médica na escolha do tipo de parto. Durante trabalho de parto e parto as práticas de deambulação, liberdade de posição, alimentação e direito à analgesia foram pouco evidenciadas, o direito do acompanhamento familiar ainda é pouco respeitado. O aleitamento materno foi incentivado após o parto, o alojamento conjunto foi visto como espaço de abandono e solidão. A percepção da parturiente quanto à assistência ao parto no Sistema Único de Saúde os dados direcionam para falta de educação dos profissionais de saúde. CONCLUSÃO: Os dados apontaram para situações como dificuldade de acesso ao pré-natal, desinformação das condutas e procedimentos a serem adotados, ausência da participação da mulher na tomada de decisão e ausência do acompanhante no parto, situações que contradizem com o preconizado pela Política de humanização ao pré-natal, parto e nascimento.

This paper deals with two-dimensional Finite Element Analysis of the End Notched Flexure (ENF) specimen. The specimen is known to be unstable if the crack length is shorter than some critical crack length acr. A geometric linear two-dimensional Finite Element (FE) analysis of the ENF specimen is performed to evaluate acr for isotropic and orthotropic elastic materials, respectively. Moreover, the Mode II Energy Release Rate (ERR) JII and the compliance of the specimen are calculated. The influence of anisotropy is studied. Comparisons are made with the results from beam theory. This work is an extension of previous work.