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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
51

Qualidade ambiental nos espaços livres de áreas verticalizadas da cidade de São Paulo\". / Environmental quality in free spaces of verticalized areas of the city of São Paulo

Moreno, Manuel Francisco Navarro 27 March 2001 (has links)
Este trabalho versa sobre a verticalização em São Paulo e seus impactos sobre a qualidade ambiental dos espaços livres. Parte-se do pressuposto de que a não compreensão, por parte do corpo técnico e da população em geral, dos problemas resultantes da verticalização (tais como: sombreamentos, canalização de ventos, alteração da umidade do ar, maior aquecimento e agravamento da poluição) piora a qualidade ambiental dos espaços livres. No corpo do trabalho são introduzidos os procedimentos básicos para o aprimoramento da qualidade ambiental, que devem ser conhecidos e aplicados normalmente no projeto dos espaços livres. Os espaços livres públicos, como as vias, praças e parques, assim como os espaços privados, que são os espaços livres existentes nos lotes, em torno das edificações; têm perdido sua habitabilidade em conseqüência da verticalização e do adensamento urbano, mesmo com a aplicação da atual legislação de uso e ocupação do solo. Implantada em 1972, ela gera espaços livres mais generosos do que anteriormente, com a obrigatoriedade de novos recuos e menores taxas de ocupação. Esta legislação ao determinar espaços livres um pouco maiores, cria condições para que os incorporadores agreguem, aos seus empreendimentos, equipamentos para o lazer, mesmo que essas áreas sejam ambientalmente inadequadas. A qualidade ambiental resultante é analisada sob o aspecto perceptivo-sensorial, considerando-se a influência que o Meio Urbano Verticalizado (malha viária, espaços livres, quadras, lotes e edificações) tem sobre as variáveis ambientais do Meio Natural (radiação solar, ar, água, solo, vegetação e fauna). As variáveis ambientais são analisadas em cinco regiões com bairros densamente verticalizados: a) Centro: Higienópolis; b) Norte: Freguesia do Ó; c) Sul: Moema; d) Leste: Vila Gomes Cardim; e) Oeste: Perdizes. Como resultado, são apresentadas recomendações, implementáveis no processo de projeto, para melhorar a qualidade ambiental nos espaços livres urbanos de áreas verticalizadas. / This thesis turns on the verticalization in São Paulo and its impacts on the environmental quality of free spaces. It breaks of the presupposition that the nonunderstanding, on the part of the technical body and of the population in general, of the resulting problems of the verticalization (such as shadows, canalization of winds, alteration of the humidity of the air, larger heating and worsening of the pollution) worsens the environmental quality of free spaces. In the body of the work the basic procedures are introduced to increase the environmental quality that should be known and usually applied in the project of such spaces. The public free spaces, as roads, squares and parks; as well as the private spaces, that are the existent free spaces in the lots, around the constructions; they have been losing its inhabitability in consequence of the verticalization and the increase of the urban areas, even with the application of the current legislation on use and occupation of the soil. Implanted in 1972, it generates more generous free spaces than previously, with the obligation of new recoils and smaller occupation rates. This legislation when establishing free spaces a little larger, it creates conditions so that the incorporators joins, to its enterprises, equipments for leisure, even if those areas are functionally inadequate for such, even if they never receive sun light or that make funnel-shaped and accelerate the winds. The resulting environmental quality is analyzed under the perceptive-sensorial aspect, considering the influence that the Verticalized Urban Way (its street ensemble, free spaces, blocks, lots and constructions) has on the environmental variables of the Natural Way (solar radiation, air, water, soil, vegetation and fauna). The analysis are applied to five areas with neighborhoods densely verticalized: a) Center: Higienópolis; b) North: Freguesia do Ó; c) South: Moema; d) East: Vila Gomes Cardim; e) West: Perdizes. As result, recommendations presented, to be used in the project process, to improve the environmental quality in the urban free spaces of verticalized areas.
52

Měření mechanické stability budov a stožárů využívaných pro FSO spoje / Measurement of the Mechanical Stability of Buildings and Consoles Used for the FSO Links

Kočvara, Pavel January 2015 (has links)
The Master's thesis deals with the determination of measurement method of deflection the axis of the optical beam from its ideal position, which is caused by action of force of strong winds affecting the positional stability of the building or supporting structure (tower) used for placement of FSO links'heads. The thesis informs the readers about the other causes of deflection of beam axis in a real environment, about methods of determining the position of the beam axis in the plane perpendicular to the beam axis and the basic properties and parameters of the Gauss beams, including the phenomenon of diffraction on the output aperture of the laser transmitter.
53

Podpůrný systém pro správu a řízení FSO transceiveru / Support system for administration and control of FSO transceiver

Janík, Lukáš January 2016 (has links)
Tato práce se zabývá problematikou optických bezkabelových spojů (FSO). V úvodní kapitole jsou diskutovány přednosti, základní principy a dílčí komponenty FSO spojů. Druhá kapitola se zabývá atmosférou z pohledu šířícího se optického svazku, jejím složením, základními veličinami a jevy v ní nastávajícími. V následující kapitole je popsáno několik metod ke zmírnění jevů majících negativní vliv na kvalitu spoje. Druhá část práce se zabývá návrhem podpůrného systému pro FSO, založeném na softcore mikroprocesoru MicroBlaze, návrhem jednoduchého síťového přepínače a síťového rozhraní. Závěr práce pojednává o implementaci webového serveru a tvorbě webové prezentace umožňující vzdálenou správu FSO a jeho komponent.
54

Barock eller bara rock? : En studie av musiklärares frirum - Att bli lärare på riktigt / Baroque or just rock? : A study of music teachers´ free space - To become a teacher

Persson, Daniel January 2021 (has links)
Sammanfattning Syftet i studien är att belysa musiklärarens dilemma i valet mellan musik som uttryck och musik som skolämne. I detta arbete presenteras hur den personliga utvecklingen över tid påverkar prioriteringar och didaktiska val i musiklärares identitetsskapande. Studien bygger på musiklärares livserfarenheter. Empirin omfattar djupintervjuer med tre musiklärare vilka har många års erfarenhet av undervisning i musik. Deras berättelser tolkades och bearbetades utifrån ett sociokulturellt perspektiv för att skapa förståelse för hur de i sin yrkesroll identifierar sig själva som musiker och/eller musiklärare. Vidare hur detta identitetsskapande fått betydelse för musikundervisningen. Resultatet beskriver det frirum och handlingsutrymme lärarna upplever finns i deras praktikmiljö och skapas för musikundervisning. I resultatet framkommer att lärarna pendlar mellan musikerrollen och lärarrollen. Vidare att de utifrån styrdokumenten och sin sociala hemvist ofta uttrycker sin upplevelse av musikens och musicerandets djupare dimension och effekterna därav i deras undervisning. Detta visar hur dilemmat i valet mellan musik som uttryck och musik som skolämne ständigt är närvarande i musikläraryrket. / Abstract The purpose of the study is to shed light on the music teacher's dilemma in the choice between music as expression and music as school subject. This work presents how personal development over time affects priorities and didactic choices for music teachers' identity creation. The study describes three music teachers' life experiences. The method conducted was as in-depth interviews with three music teachers, who have many years of experience in teaching music. Their life stories were interpreted and processed from a socio-cultural perspective with the aim to understand how they in their professional role identify themselves as musicians and/or music teachers. The result shows that a teacher´s identity creation is important for music education. The teacher´s in this study describes how the free space and space of action effect their internship environment and subject for music teaching. The result shows that the teachers commute between the role of musician and the role of teacher. Furthermore, based on the governing documents and their social domicile, they often express their experience of the deeper dimension of music and making music and the effects thereof in their teaching. This shows how the dilemma in the choice between music as expression and music as school subject is constantly present in the music teaching profession.
55

Experimental Study on the Effects of OAM Beams Propagating through Atmospheric Turbulence

Wu, HaoLun 07 August 2023 (has links)
No description available.
56

Contemporary Techniques in the Emerging Free Space Optical Communication Systems

Briantcev, Dmitrii 06 1900 (has links)
The goal of this work is to investigate and advance a research on various topics, vital for the development of the future generations of optical communication technology. In the first part of the work, we present a fast and efficient simulation method of structured light free space optics (FSO) channel effects from propagation through the turbulent atmosphere. Information content encoded on the information-bearing beams relevant to the propagation in the context of the direct detection can be expressed in the form of the decomposition matrix at the receiver. To construct these matrices outside of the experiment, a complete physical simulation of some sort needs to occur. Due to the model assumptions, current beam generation techniques based on the phase-screen approximation method can be very slow and are fundamentally limited in their predictive power. We propose to circumvent that with a data-driven approach for decomposition matrix simulation with a Conditional Generative Adversarial Network (CGAN) synthetic simulator. In the second part, we focus on predicting the beam wander of the beam subject to turbulence at the receiver. We present an Recurrent Neural Network - based simulator, designed to predict the future beam wander position based on the previous measurements. The Recurrent Neural Network (RNN) architecture and training method are described. The proposed approach is demonstrated using under-sampled Gaussian beam experimental data as the worst case and over-sampled simulated data for both Gaussian beams and structured light beams as the best case. In the final part of this work, we discuss the Kramers - Kronig receiver, recently proposed promising pseudo-coherent communication scheme. We detail the operating procedure and developed simulation of this scheme, and provide both experimental and simulation results. In experiment, we present a case of proof-of-concept joint sensing and communication over an optical fiber. In simulation, we present a BER analysis of a KK NN decoder in presence of log-normal turbulence and AWGN.
57

LIMITATIONS OF HOST PLANT USE IN TWO ANDEAN ALTINOTE (NYMPHALIDAE, HELICONIINEA, ACRAEINI), BUTTERFLIES, FROM A TRITROPHIC PERSPECTIVE.

Pedersen, Karen M. 11 May 2015 (has links)
No description available.
58

Combinatorial and Discrete Problems in Convex Geometry

Alexander, Matthew R. 08 November 2017 (has links)
No description available.
59

Design and Implementation of an Optical Tag Reader

Gummalla, Srikanth 17 April 2009 (has links)
No description available.
60

Photonic Crystal Fibers and Optical True Time Delay Engines for Wideband Arrays

Nahar, Niru Kamrun 08 September 2008 (has links)
No description available.

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