Detección de puntos débiles de aislamiento acústico en edificación ya construida

El aislamiento acústico es un problema de difícil solución una vez que la obra ya está acabada. En el caso de que la obra esté finalizada y no se cumplan con los valores de calidad acústicos que nos marca la legislación, deben detectarse los puntos débiles que provocan esa deficiencia de aislamiento acústico. La publicación de catálogos de soluciones constructivas hace que el problema no sea el material elegido, sino cómo se han unido estos materiales entre sí. Por tanto, debe analizarse este problema y buscar mecanismos con los que determinar los puntos débiles. En este trabajo se propone un método para la determinación de caminos débiles de transmisión entre un recinto emisor y un recinto receptor. El método obtiene el índice de reducción vibracional, como indicador de estos caminos débiles. Se muestran en el trabajo varios casos estudiados en el propio edificio, y cómo valorar la transmisión que debilita el aislamiento global de todo el conjunto constructivo.

Auto safety: effectiveness of Ford Transmission settlement still at issue.

Mode of access: Internet.

The effect of light truck design variables on top speed, performance, and fuel economy, 1981. Final report.

National Highway Traffic Safety Administration, Office of Research and Development, Washington, D.C.

Automotive manufacturing assessment system. Volume II: product schedules of engine/drivetrain combinations. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Feasibility demonstration of a novel, flat-belt, continuously variable transmission for automotive and electric-hybrid vehicle application. Final report.

Energy Department, Washington, D.C.

Increased fuel economy in transportation systems by use of energy management - third year's program. Final report.

Transportation Department, Washington, D.C.

Evaluation of automobile drivetrain components to improve fuel economy. Final report.

National Highway Traffic Safety Administration, Office of Research and Development, Washington, D.C.

Study and test to confirm automobile drivetrain components to improve fuel economy. Volume I: history of the automobile transmission in the United States. Interim report.

National Highway Traffic Safety Administration, Office of Research and Development, Washington, D.C.

Study and test to confirm automobile drivetrain components to improve fuel economy. Volume II: the drivetrain design process with an automatic transmission. Interim report.

National Highway Traffic Safety Administration, Office of Research and Development, Washington, D.C.

The TAF5L gene on chromosome 1q42 is associated with type 1 diabetes in Russian affected patients

Type 1 diabetes (T1D) is a multifactorial autoimmune disease, with strong genetic component. Several susceptibility loci contribute to genetic predisposition to T1D. One of these loci have been mapped to chromosome 1q42 in UK and US joined affected family data sets but needs to be replicated in other populations. In this study, we evaluated sixteen microsatellites located on 1q42 for linkage with T1D in 97 Russian affected sibling pairs. A 2.7-cm region of suggestive linkage to T1D between markers D1S1644 and D1S225 was found by multipoint linkage analysis. The peak of linkage was shown for D1S2847 (P = 0.0005). Transmission disequilibrium test showed significant undertransmission of the 156-bp allele of D1S2847 from parents to diabetic children (28 transmissions vs. 68 nontransmissions, P = 0.043) in Russian affected families. A preferential transmission from parents to diabetic offspring was also shown for the T(-25) and T1362 alleles of the C/T(-25) and C/T1362 dimorphisms, both located at the TAF5L gene, which is situated 103 kb from D1S2847. Together with the A/C744 TAF5L SNP, these markers share common T(-25)/A744/T1362 and C(-25)/C744/T1362 haplotypes associated with higher and lower risk of diabetes (Odds Ratio = 2.15 and 0.62, respectively). Our results suggest that the TAF5L gene, encoding TAF5L-like RNA polymerase II p300/CBP associated factor (PCAF)-associated factor, could represent the susceptibility gene for T1D on chromosome 1q42 in Russian affected patients.

Evaluation of IDDM8 susceptibility locus in a Russian simplex family data set

Type 1 diabetes (TID) susceptibility locus, IDDM8, has been accurately mapped to 200 kilobases at the terminal end of chromosome 6q27. This is within the region which harbours a cluster of three genes encoding proteasome subunit beta 1 (PMSB1), TATA-box binding protein (TBP) and a homologue of mouse programming cell death activator 2 (PDCD2). In this study, we evaluated whether these genes contribute to TID susceptibility using the transmission disequilibrium test of the data set from 114 affected Russian simplex families. The A allele of the G/A1180 single nucleotide polymorphism (SNP) at the PDCD2 gene, which was significant in its preferential transfer from parents to diabetic children (75 transmissions vs. 47 non-transmissionS, x(2) = 12.85, P corrected = 0.0038), was found to be associated with T1D. G/A1180 dimorphism and two other SNPs, C/T771 TBP and G/T(-271) PDCD2, were shown to share three common haplotypes, two of which (A-T-G and A-T-T) have been associated with higher development risk of TID. The third haplotype (G-T-G) was related to having a lower risk of disease. These findings suggest that the PDCD2 gene is a likely susceptibility gene for TID within IDDM8. However, it was not possible to exclude the TBP gene from being another putative susceptibility gene in this region. (c) 2005 Elsevier Ltd. All rights reserved.

Physical and MAC layer techniques for next generation satellite communications

In this thesis, we consider four different scenarios of interest in modern satellite communications. For each scenario, we will propose the use of advanced solutions aimed at increasing the spectral efficiency of the communication links. First, we will investigate the optimization of the current standard for digital video broadcasting. We will increase the symbol rate of the signal and determine the optimal signal bandwidth. We will apply the time packing technique and propose a specifically design constellation. We will then compare some receiver architectures with different performance and complexity. The second scenario still addresses broadcast transmissions, but in a network composed of two satellites. We will compare three alternative transceiver strategies, namely, signals completely overlapped in frequency, frequency division multiplexing, and the Alamouti space-time block code, and, for each technique, we will derive theoretical results on the achievable rates. We will also evaluate the performance of said techniques in three different channel models. The third scenario deals with the application of multiuser detection in multibeam satellite systems. We will analyze a case in which the users are near the edge of the coverage area and, hence, they experience a high level of interference from adjacent cells. Also in this case, three different approaches will be compared. A classical approach in which each beam carries information for a user, a cooperative solution based on time division multiplexing, and the Alamouti scheme. The information theoretical analysis will be followed by the study of practical coded schemes. We will show that the theoretical bounds can be approached by a properly designed code or bit mapping. Finally, we will consider an Earth observation scenario, in which data is generated on the satellite and then transmitted to the ground. We will study two channel models, taking into account one or two transmit antennas, and apply techniques such as time and frequency packing, signal predistortion, multiuser detection and the Alamouti scheme.

Designing a Computer Vision System for Underwater Robotic Interventions

This thesis deals with the challenging problem of designing systems able to perceive objects in underwater environments. In the last few decades research activities in robotics have advanced the state of art regarding intervention capabilities of autonomous systems. State of art in fields such as localization and navigation, real time perception and cognition, safe action and manipulation capabilities, applied to ground environments (both indoor and outdoor) has now reached such a readiness level that it allows high level autonomous operations. On the opposite side, the underwater environment remains a very difficult one for autonomous robots. Water influences the mechanical and electrical design of systems, interferes with sensors by limiting their capabilities, heavily impacts on data transmissions, and generally requires systems with low power consumption in order to enable reasonable mission duration. Interest in underwater applications is driven by needs of exploring and intervening in environments in which human capabilities are very limited. Nowadays, most underwater field operations are carried out by manned or remotely operated vehicles, deployed for explorations and limited intervention missions. Manned vehicles, directly on-board controlled, expose human operators to risks related to the stay in field of the mission, within a hostile environment. Remotely Operated Vehicles (ROV) currently represent the most advanced technology for underwater intervention services available on the market. These vehicles can be remotely operated for long time but they need support from an oceanographic vessel with multiple teams of highly specialized pilots. Vehicles equipped with multiple state-of-art sensors and capable to autonomously plan missions have been deployed in the last ten years and exploited as observers for underwater fauna, seabed, ship wrecks, and so on. On the other hand, underwater operations like object recovery and equipment maintenance are still challenging tasks to be conducted without human supervision since they require object perception and localization with much higher accuracy and robustness, to a degree seldom available in Autonomous Underwater Vehicles (AUV). This thesis reports the study, from design to deployment and evaluation, of a general purpose and configurable platform dedicated to stereo-vision perception in underwater environments. Several aspects related to the peculiar environment characteristics have been taken into account during all stages of system design and evaluation: depth of operation and light conditions, together with water turbidity and external weather, heavily impact on perception capabilities. The vision platform proposed in this work is a modular system comprising off-the-shelf components for both the imaging sensors and the computational unit, linked by a high performance ethernet network bus. The adopted design philosophy aims at achieving high flexibility in terms of feasible perception applications, that should not be as limited as in case of a special-purpose and dedicated hardware. Flexibility is required by the variability of underwater environments, with water conditions ranging from clear to turbid, light backscattering varying with daylight and depth, strong color distortion, and other environmental factors. Furthermore, the proposed modular design ensures an easier maintenance and update of the system over time. Performance of the proposed system, in terms of perception capabilities, has been evaluated in several underwater contexts taking advantage of the opportunity offered by the MARIS national project. Design issues like energy power consumption, heat dissipation and network capabilities have been evaluated in different scenarios. Finally, real-world experiments, conducted in multiple and variable underwater contexts, including open sea waters, have led to the collection of several datasets that have been publicly released to the scientific community. The vision system has been integrated in a state of the art AUV equipped with a robotic arm and gripper, and has been exploited in the robot control loop to successfully perform underwater grasping operations.

TV a.G: A PROGRAMAÇÃO TELEVISIVA PAULISTA ANTES DA GLOBO

A programação é a alma da emissora, ela dá identidade ao canal e é o verdadeiro produto da TV. A grade de programação faz parte de uma estratégia que busca atrair o máximo de audiência possível e, principalmente, mantê-la fiel. Na década de 1970, a TV Globo alcançou o primeiro lugar de audiência com um modelo de grade que, em linhas gerais, permanece até hoje, como por exemplo, o sanduíche novela-telejornal-novela. Mas como era programação televisiva antes da Globo? Quais os gêneros de programas mais comuns? O era exibido no horário nobre? Como era a programação da então líder TV Tupi? Da glamurosa TV Excelsior? Da TV Record de Paulo Machado de Carvalho? E da pequena TV Paulista que funcionava num apartamento? Nas duas primeiras décadas da TV brasileira é que surgiram as pesquisas de audiência, o videoteipe, as transmissões via satélite e o início da formação das redes. Como algumas dessas tecnologias influenciaram a programação? Por meio de uma metodologia quantitativa e qualitativa, baseada em pesquisa bibliográfica, observação de dados e em entrevistas com profissionais do setor, esta pesquisa de caráter exploratório se baseia em dois eixos estruturais: 1) Rever os principais critérios de classificação de gêneros televisivos e, com esta classificação, fazer a segunda parte do estudo: 2) Analisar as características de programação das quatro emissoras comerciais de maior audiência da TV aberta paulista, nas décadas de 1950 e 1960.

ISTO NÃO É TV, É MTV: linguagem da MTV brasileira

A MTV brasileira está no ar há 15 anos no Brasil e desde o início de suas transmissões, em 1990, evoluiu consideravelmente a variedade de programas que oferece diariamente em sua grade de programação, saindo da simples reprodução de videoclipes. Essa variedade de programas, no entanto, é caracterizada por uma unidade discursiva que diferencia a MTV das outras emissoras de televisão aberta. Enquanto outras emissoras trabalham com gêneros diferentes de programas, em especial as que compõem a grade de programação de televisão aberta, a MTV consegue criar uma grade de programação diversificada, sempre direcionada a um público específico: o universo jovem. Objetivou-se realizar uma leitura qualitativa da linguagem do material simbólico que esta emissora produz a uma faixa de público especializada, subsidiada pela análise crítica de discurso, a semiótica e os estudos teóricos da Comunicação Social. Compõem o corpus de análise, os programas e vinhetas inéditos da semana de 23 a 29 de janeiro de 2006. Não foram consideradas as reprises. Demonstrou-se que é possível identificar uma estrutura discursiva que compõe uma linguagem, um discurso, que caracterizam a MTV e a diferenciam de outros canais de televisão aberta e a cabo. Uma linguagem que combina elementos do universo de sua principal audiência, os jovens. Palavras-chave: comunicação, MTV, análise de discurso, semiótica, jovem.