Nonlinear junction locator with the possibility of identifying nonlinear objects

It is concept of nonlinear radar with the ability to identify nonlinear object using DSB-signal in the role of the probe. The block diagram developed nonlinear junction radar. Here formalized tasks that are necessary for the efficient operation of the nonlinear radar, which helps to raise the accuracy of the identification of objects that include elements with nonlinear current-voltage characteristics

Clínica e reprodução de bovinos leiteiros

O presente relatório resulta do estágio curricular realizado na área de Clínica de Espécies Pecuárias, no âmbito do Mestrado Integrado em Medicina Veterinária. Na primeira parte, são descritas as explorações onde o estágio se realizou e as atividades desenvolvidas nas mesmas. Numa segunda parte, efetuou-se uma revisão bibliográfica sobre os fatores reprodutivos que afetam explorações leiteiras e, numa terceira parte, desenvolve-se análise dos índices reprodutivos nas explorações onde decorreu o estágio. No presente trabalho pretendeu-se descrever os principais fatores que influenciam os parâmetros reprodutivos de uma exploração de bovinos de leite, de modo a perceber a ação destes em regime intensivo, comparando duas formas de assistência veterinária, permanente e periódica. Os dados foram tratados graficamente para avaliar os principais índices reprodutivos. O estudo revelou que as altas produções leiteiras estão associadas a maiores problemas reprodutivos e que a assistência veterinária é um fator muito importante no desenvolvimento, implementação e controlo dos programas reprodutivos; Abstract: Practice and Reproduction of dairy cattle. The present report has been produced, as part of the master's degree in Veterinary Medicine. In the first part a description of the developed activities during the training post is presented. In the second part there is a review of the literature on the reproductive factors affecting the performance in dairy cattle. In the third part of the present work, an analysis of the reproductive performance on two hosting farms was produced. We described the main factors influencing the reproductive parameters of dairy production in order to understand their effects on both farms under evaluation, having in account the differences of veterinary services (internal and external). Our study showed that dairy production units with high production are associated with higher reproductive problems and, the veterinary activity on dairy health management is a very important factor on the development, implementation and monitoring of reproductive programs

Impact of the architecture of dye sensitized solar cell-powered electrochromic devices on their photovoltaic performance and the ability to color change

The functional layers arrangement in a dye sensitized solar cell electrochromic device (DSSC-EC) on the energy conversion efficiency and on the ability to change the color is studied. The highest power conversion efficiency of ca. 7% and good color change in closed circuit conditions was observed with electrochromic WO3 deposited on the counter-electrode of the DSSC. When WO3 layer was applied over the photoanode, the DSSC-EC displayed less power conversion efficiency - 3.4%, but a more intense color change was observed under illumination and opened external circuit. Response of the photocurrent vs. applied potential, incident photon-to-current conversion efficiency and optical behavior of the DSSC-EC were assessed and discussed considering optical properties of the components of the device and their energy bands alignment. Smart window and self-powered proof-of-concept pixelated device operating on DSSC-EC are presented

Use of ultra-wideband signals in nonlinear radar

The analysis is given of the ways to improve the sensitivity of nonlinear radar to eavesdropping devices having small dimensions and having in its composition nonlinear objects. We investigated the method to increase the sensitivity by using, as the probe signal ultra-wideband pulses together with the harmonic signal of microwave frequency, which could result in intermodulation effect, through which run the identification nonlinear objects among the plurality of reflectors, which do not apply to non-linear objects

Pulse modulation for ultra-wideband communication systems

The basic types of pulse modulation used for ultra-wideband communication systems are considered. The interactions between a modulated signal and additive white Gaussian noise are analyzed. The most noiseproof and optimum types of modulation for practical implementation are defined

Calculation of thin-walled rods by numerical methods

Thin-walled steel structures are used extensively in construction. They have become a common design solution for low-rise building, attics, walling multistory building. When modeling thin-walled structures the integrated system SCAD Office is widely used. SCAD Office is a suite of programs designed to perform the calculations of the strength and structural design of various kinds. The system, in particular, includes a program for creating spatial models, forum, formation and calculation of geometrical characteristics of sections, consul strength calculation of structures, SCAD. Modeling of thin-walled elements can be carried out easily in the Forum included in SCAD Office, or directly SCAD. The main objective of this work was to develop a technique for constructing finite-element simulation models of such elements