I deal with historical encryption procedures and with their application in teaching in my diploma thesis. I present a brief list of some encryption methods in following chapters which were used from antiquity to the mid-20th century. There are prepared specific worksheets for encryption and decryption in this thesis. For several ciphers, the required tools are included in this work, too.

abstract: Ten regional climate models (RCMs) and atmosphere-ocean generalized model parings from the North America Regional Climate Change Assessment Program were used to estimate the shift of extreme precipitation due to climate change using present-day and future-day climate scenarios. RCMs emulate winter storms and one-day duration events at the sub-regional level. Annual maximum series were derived for each model pairing, each modeling period; and for annual and winter seasons. The reliability ensemble average (REA) method was used to qualify each RCM annual maximum series to reproduce historical records and approximate average predictions, because there are no future records. These series determined (a) shifts in extreme precipitation frequencies and magnitudes, and (b) shifts in parameters during modeling periods. The REA method demonstrated that the winter season had lower REA factors than the annual season. For the winter season the RCM pairing of the Hadley regional Model 3 and the Geophysical Fluid-Dynamics Laboratory atmospheric-land generalized model had the lowest REA factors. However, in replicating present-day climate, the pairing of the Abdus Salam International Center for Theoretical Physics' Regional Climate Model Version 3 with the Geophysical Fluid-Dynamics Laboratory atmospheric-land generalized model was superior. Shifts of extreme precipitation in the 24-hour event were measured using precipitation magnitude for each frequency in the annual maximum series, and the difference frequency curve in the generalized extreme-value-function parameters. The average trend of all RCM pairings implied no significant shift in the winter annual maximum series, however the REA-selected models showed an increase in annual-season precipitation extremes: 0.37 inches for the 100-year return period and for the winter season suggested approximately 0.57 inches for the same return period. Shifts of extreme precipitation were estimated using predictions 70 years into the future based on RCMs. Although these models do not provide climate information for the intervening 70 year period, the models provide an assertion on the behavior of future climate. The shift in extreme precipitation may be significant in the frequency distribution function, and will vary depending on each model-pairing condition. The proposed methodology addresses the many uncertainties associated with the current methodologies dealing with extreme precipitation. / Dissertation/Thesis / M.S. Civil and Environmental Engineering 2013

Submitted by Erika Demachki (erikademachki@gmail.com) on 2015-03-13T20:51:57Z No. of bitstreams: 2 Dissertação - Geovane Miranda Ferreira - 2010.pdf: 1112321 bytes, checksum: e69a5e93643d9b7879c12725fd642a20 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Approved for entry into archive by Erika Demachki (erikademachki@gmail.com) on 2015-03-13T20:59:55Z (GMT) No. of bitstreams: 2 Dissertação - Geovane Miranda Ferreira - 2010.pdf: 1112321 bytes, checksum: e69a5e93643d9b7879c12725fd642a20 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2015-03-13T20:59:55Z (GMT). No. of bitstreams: 2 Dissertação - Geovane Miranda Ferreira - 2010.pdf: 1112321 bytes, checksum: e69a5e93643d9b7879c12725fd642a20 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2010-08-20 / Fundação de Amparo à Pesquisa do Estado de Goiás - FAPEG / The aim objective of this study was to evaluate the association of the classifications subjected of bone tissue in areas to dental implants and compare it with objective parameters for assessment of primary stability: final insertion torque (TIF) and the frequency of resonance (AFR). Method: 52 patients previously selected partially edentulous were treated with 135 dental implants (TI Cortical Titamax - Neodent ®, Curitiba, PR, Brazil) in the posterior and anterior maxilla (N = 58) and mandible (N = 77) using method conventional two stage. The diameter of the implants ranged from 3.75 mm to 5.0 mm and length of 9.0 mm to 15.0 mm. The bone sites selected for rehabilitation with implants were subjectively classified as bone quality by three independent observers using three subjective methods different: radiographs panoramic and periapical and tactile perception of the operator during drilling site implantable - classification of Lekholm & Zarb original (L&Zoriginal); panoramic radiograph and periapical - classification of Lekholm & Zarb modified (PP), trabecular bone pattern - classification Lindh (Lindh). And objectively assessed by recording the final insertion torque (TIF) obtained electronically by the engine BLM 600 Plus Driller or manually by the turnstile and through analysis of resonance frequency (AFR) obtained at the time of implant installation and four months later, during to reopen. Results: The TIF ranged from 15 to 80 Ncm (Mean = 37.91, SD = 16.87) showing a significant correlation with the ratings L&Zoriginal, PP, AFR initial and reopened and the diameter of the implants (p <0.01). The initial ISQ values ranged from 37-90 (mean = 73.31, SD = 9.80) and ISQ reopening ranged from 22 to 95 (mean = 77.86, SD = 10.08) with significant correlation of the initial ISQ and reopened with all sorts of subjective type bone, with the TIF and the diameter of the implants (p <0.01). The classification of type bone that he thought the tactile perception of the operator (L&Zoriginal) group had better ability to predict the values of EP (AFR and TIF). In conclusion, the classification of L&Zoriginal is an effective method for predicting values of EP and modifications in the implementation of the method as originally proposed could undermine that assertion. / O objetivo desse estudo foi avaliar a associação das classificações do tecido ósseo em áreas submetidas a implantes dentários e compará-la com parâmetros objetivos de avaliação da estabilidade primária: torque de inserção final (TIF) e análise de freqüência de ressonância (AFR). Método: 52 pacientes parcialmente edêntulos e previamente selecionados foram tratados com 135 implantes dentários (Titamax TI Cortical – Neodent®, Curitiba, PR, Brasil) em região posterior e anterior de maxila (N=58) e mandíbula (N=77) utilizando método convencional de dois estágios com perspectiva de reabilitação com prótese fixa. O diâmetro dos implantes variou de 3,75mm a 5,0mm e o comprimento de 9,0mm a 15,0mm. Os sítios ósseos selecionados para reabilitação com implantes foram classificados subjetivamente quanto à qualidade óssea por 3 examinadores independentes usando 3 métodos subjetivos diferentes: radiografia panorâmica e periapical e a percepção tátil do operador durante a perfuração do sítio implantável – classificação de Lekholm & Zarb original (L&Zoriginal); radiografia panorâmica e periapical – classificação de Lekholm & Zarb modificada (PP); padrão ósseo trabecular em radiografias periapicais– classificação de Lindh (Lindh) e avaliados objetivamente por meio do registro do torque de inserção final (TIF) obtido eletronicamente ou manualmente pela catraca e através da análise de freqüência de ressonância (AFR) obtida no momento da instalação do implante e quatro meses após, durante a reabertura. Resultados: O TIF variou de 15 a 80 Ncm (Média=37,91; SD=16,87) mostrando significante correlação com as classificações L&Zoriginal, PP, a ISQ inicial e reabertura e com o diâmetro dos implantes (p<0,01). Os valores de ISQ inicial variaram de 37 a 90 (Média=73.31, SD = 9.80) e o ISQ reabertura variou de 22 a 95 (Média=77.86, SD = 10.08) com correlação significativa da ISQ inicial e reabertura com todas as classificações subjetivas do tipo ósseo, com o TIF e com o diâmetro dos implantes (p<0,01). A classificação do tipo ósseo que considerava a percepção tátil do operador (L&Zoriginal) foi a que teve melhor capacidade de predizer os valores da EP (AFR e TIF). Em conclusão, a classificação de L&Zoriginal é um método eficaz para predizer valores de EP e modificações na execução do método como originalmente proposto podem comprometer a referida afirmação.

A presente dissertação tem como objetivo principal estudar a propagação acústica em escoamentos monofásicos. Para tal, são analisados sinais transientes de pressão fornecidos por sensores instalados em posições conhecidas na linha de teste, através do estudo de técnicas de análise de sinais, a fim de investigar se as variações do conteúdo espectral dos sinais são influenciadas pela ocorrência de vazamentos no duto. A análise dos sinais foi realizada nos planos temporal, frequencial, tempo-frequência e estatístico. Os resultados experimentais foram obtidos no oleoduto piloto do NETeF - Núcleo de Engenharia Térmica e Fluidos da USP - Universidade de São Paulo, com uma seção de testes com 1500 metros e diâmetro de 51,2 mm, com escoamento monofásico de água. Os resultados obtidos através da análise tempo-frequência mostraram-se satisfatórios, sendo esta técnica capaz de identificar a composição espectral instantânea de um sinal, ou seja, foi eficiente na identificação de picos de amplitude da frequência ao longo do eixo temporal. Além disso, a análise probabilística, através do desvio-padrão do sinal também mostrou-se eficiente exibindo uma disparidade significativa entre os sinais com e sem vazamento. / The present dissertation reports on the study of the acoustic propagation in single-phase flow. It analyzes the transient signals provided by pressure sensors in known locations in the test line through the study of signal analysis techniques to investigate if the variations in spectral content of the signals are influenced by the occurrence of leaks in the pipe. The analysis of signals was performed in the time, frequency, time-frequency and statistical plans. The experimental results were obtained in a 1500 meter-long and 51.2 millimeter-diameter pilot pipeline at the Center of Thermal Engineering and Fluids, with single-phase flow of water. The results obtained by time-frequency analysis were satisfactory, allowing identifying the spectral composition of an instantaneous signal, i.e., the analysis was effective in identifying the frequency amplitude peaks along the time axis. Moreover, probabilistic analysis using the standard deviation of the signal was also efficient, displaying a significant disparity between the signals with and without leakage.

Submitted by Renata Lopes (renatasil82@gmail.com) on 2018-11-22T11:04:41Z No. of bitstreams: 1 maraisaaparecidapintoresende.pdf: 6162684 bytes, checksum: 81f875f5effd371befe15f0ee40da393 (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2018-11-23T12:58:47Z (GMT) No. of bitstreams: 1 maraisaaparecidapintoresende.pdf: 6162684 bytes, checksum: 81f875f5effd371befe15f0ee40da393 (MD5) / Made available in DSpace on 2018-11-23T12:58:47Z (GMT). No. of bitstreams: 1 maraisaaparecidapintoresende.pdf: 6162684 bytes, checksum: 81f875f5effd371befe15f0ee40da393 (MD5) Previous issue date: 2018-09-19 / CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / O objetivo deste estudo clínico controlado randomizado microtomográfico foi comparar a qualidade óssea entre dois métodos diferentes de preservação do rebordo alveolar e avaliar as estabilidades primária e secundária dos implantes instalados nessas regiões. Vinte pacientes foram divididos aleatoriamente em dois grupos de tratamento após uma única extração dentária. Dez alvéolos foram enxertados com fosfato de cálcio bifásico (SBC, n = 10) associado a um retalho de tecido conjuntivo subepitelial pediculado para o fechamento primário. Dez alvéolos foram selados com uma restauração provisória de pôntico ovóide (PROV, n = 10) sem material de enxertia. Após 12 meses, 9 pacientes perderam-se no acompanhamento e 11 pacientes receberam implantes dentários. As biópsias ósseas foram avaliadas por microtomografia computadorizada (8 μm), quanto às características do osso trabecular. Valores de torque de inserção (ITV) e quociente inicial de estabilidade do implante (ISQI) foram registrados no momento da instalação dos implantes. O ISQ também foi registrado aos 7 dias, 30 dias e 60 dias pós-operatórios. Todos os onze pacientes tiveram os implantes osseointegrados sem intercorrências. O grupo PROV apresentou trabéculas mais espessas (0,17 ± 0,03) em relação ao grupo SBC (0,11 ± 0,03) (p = 0,03). O osso trabecular foi mais anisotrópico em PROV (0,3 ± 0,08) comparado com SBC (0,1 ± 0,07) (p = 0,01). O grupo PROV apresentou menor superfície óssea (26,02 ± 10,36) que o grupo SBC (40,09 ± 10,94) (p = 0,05). Além disso, o PROV apresentou ISQ inicial mais alto (72,3 ± 21) em comparação com o SBC (67 ± 3,9) (p = 0,05). O osso trabecular revelou diferenças na microarquitetura entre os dois métodos de preservação do rebordo alveolar e ambos os métodos foram satisfatórios para a instalação do implante e resultaram em altos valores de ITV e ISQ. / This randomized controlled clinical microtomographic trial aimed to compare the bone quality between two different methods of alveolar ridge preservation and to evaluate the primary and secondary implant stability. Twenty patients were randomly divided into two groups following a single tooth extraction: SBC group (n=10), sockets were grafted with alloplastic biphasic calcium phosphate and a pedicle subepithelial connective tissue flap was used for primary closure; and PROV group (n=10), sockets were sealed with an ovate pontic provisional restoration. After 12 months, 11 patients received dental implants, with nine patients lost to follow-up. Bone biopsies were evaluated by microcomputed-tomography (8 μm) to determine cancellous bone characteristics. Insertion torque values (ITV) and initial implant stability quotient (ISQI) were recorded at installation. The ISQ was also recorded 7, 30 and 60 days after the implant was installed. All implants showed uneventful osseointegration. The PROV group presented thicker trabeculae (0.17±0.03) compared to the SBC group (0.11±0.03; p 0.03). Trabeculae bone was more anisotropic in the PROV group (0.3±0.08) compared with the SBC group (0.1±0.07; p 0.01). The PROV group presented less bone surface (26.02±10.36) than the SBC group (40.09±10.94; p 0.05). Also, PROV showed higher ISQI (72.3±21) than SBC (67±3.9; p 0.05). The characteristics of the trabecular bone differed between the two alveolar ridge preservation methods and the both preservation methods gave satisfactory results with regard to implant placement, and both resulted in high values for ITV and ISQ.

There is growing concern for increased frequency of extreme events due to several severe floods and droughts occurring globally in recent years. Improving knowledge on the complexity of hydrological systems and interactions with climate is essential to be able to determine drivers and predict changes in the future. This is especially true in cold regions such as the Swedish Subarctic. This thesis explored changes in high peak flows and linked trends to climate. Trend analyses were applied on 18 catchments in the Swedish Subarctic over their entire periods of record and a common period (1990-2013) among the data to explore changes in flood magnitude, flood occurrence, mean summer flow, snowmelt onset and center of mass. Further, a flood frequency analysis was applied using the extreme value type I (Gumbel) distribution and selected flood percentiles were tested for stationarity. The results show the complexity of the hydrological system and interactions with climate. No clear overall pattern could be determined suggesting that changes are happening at catchment scale. Indications for a shift in flow regime from snowmelt-dominated to rainfall-dominated are evident with all significant trends pointing towards lower flood magnitudes in the spring flood, earlier flood occurrence and snowmelt onset, and decreasing mean summer flows. The shift in flow regime suggests that air temperature is more clearly reflected in streamflow than precipitation in the Swedish Subarctic. Decreasing trends in flood magnitude and mean summer flows are suggestive of permafrost thawing, which agrees with the increasing trends in the annual minimum flow. Long streamflow records can further link variability in streamflow to multidecadal atmospheric circulations over the North Atlantic. Most evident are changes towards lower mean summer flows (ten catchments significant at a 95% confidence interval) and earlier snowmelt onset (eight catchments significant). Trends in the selected flood percentiles show indications towards an increase in extreme events over the entire period (significant for four catchments), with all significant trends being positive. Over the common period, no pattern is notable and the sensitivity of trend analyses is evident.

This thesis deals with vibration diagnostics and on-line monitoring systems of several producers. Furthermore, this thesis contains a description and evaluation of measuring the vibrations of the machine tool spindle when machining test samples with different cutting conditions and evaluating the surface quality of test samples.

This master thesis is focused on the diagnostics of vibrations and noise of an internal combustion engine. The work also includes a summary of the current state of knowledge in which the quantities used, transmission paths, measuring devices and the possibilities of performing frequency analysis are analysed. As part of the technical experiment on which this work is based, vibrations and noise on the tractor engine are measured. The obtained data are then further processed using the BK Connect program. Subsequently, a frequency analysis is performed, specifically an order analysis. The conclusion of the analysis consists of an evaluation of individual orders that cause excitation that occur in the investigated motor.

The goal of this thesis is to create a methodology for measuring vibration on the aircraft construction with using optical system and perform basic frequency analysis. Work shortly discusses the theoretical foundations of aeroelastic phenomenon and methods of solving its own deflection shapes and frequencies. In the practical part is measurement methodology designed for simple vibration of clamped rods and then is applied to a frequency analysis of the wing.

The Human brain consists of mutually connected neuronal populations that build anatomically and functionally separated structures. To understand human brain activity and connectivity, it is crucial to describe how these structures are connected and how information is spread. Commonly used methods often work with data from scalp EEG, with a limited number of contacts, and are incapable of observing dynamic changes during cognitive processes or different behavioural states. In addition, connectivity studies almost never analyse pathological parts of the brain, which can have a crucial impact on pathology research and treatment. The aim of this work is connectivity analysis and its evolution in time during cognitive tasks using data from intracranial EEG. Physiological processes in cognitive stimulation and the local connectivity of pathology in the epileptic brain during wake and sleep were analysed. The results provide new insight into human brain physiology research. This was achieved by an innovative approach which combines connectivity methods with EEG spectral power calculation. The second part of this work focuses on seizure onset zone (SOZ) connectivity in the epileptic brain. The results describe the functional isolation of the SOZ from the surrounding tissue, which may contribute to clinical research and epilepsy treatment.