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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.
31

Numerické simulace teplotního a vlhkostního pole ve dřevě v prostředí se zvýšenou teplotou

Kubelková, Květa January 2015 (has links)
The thesis deals with numerical simulation of temperature field with internal heat sources and experimental verification of this model in an environment where the high temperatures are applied (during thermal modification of wood). The work was further extended by analysis of coupled heat and monture transfer in the wood. Designed mathematical models are solved numerically using software COMSOL Multiphysics based on the finite element analysis (FEM). The chemical reactions occur due to decomposition of woodconstituents (cellulose, hemicelluloses and lignin) are taken into account in present study. These reactions are usually not solid in known models. The results of numerical simulations of temperature field, including pyrolysis model, are compared with experimental measurements for verification of the proposed model. Contribution of this thesis is the possible application of the proposed model for the design and optimization of thermal modification Schedule with respekt to wood species and sample dimensions.
32

Espectroscopia do núcleo 23Mg acima do limiar de decaimento de prótons com interesse para astrofísica nuclear / Spectroscopy of 23Mg nucleus above the proton threshold of interest to nuclear astrophysics

Alessandro Luiz de Lara 05 November 2018 (has links)
O conhecimento das reações nucleares que ocorrem no interior das estrelas permite estudar como será a evolução destes astros e as relações de abundância entre os isótopos de alguns elementos. Em alguns casos, a detecção de elementos traços pode ser útil para inferir a ocorrência de eventos explosivos, como novas e supernovas. Um destes elementos é o 22Na, cuja abundância depende da reação de captura de próton 22Na(p, ?)23Mg. Assim, o estudo dos estados de ressonância do 23Mg, é importante para compreender o mecanismo de reação e determinar a abundância do 22Na. O núcleo de 23Mg ainda participa do ciclo NeNa na fase AGB da evolução de estrelas de massa média. Com essa motivação propomos o estudo espectroscópico do núcleo 23Mg por meio da reação de transferência 24Mg(3He, 4He)23Mg, cujos dados experimentais foram obtidos no laboratório Tandem-Orsay (França), com o uso de um feixe de 3He de 25 MeV. As ressonâncias de interesse do núcleo 23Mg estudadas nesse trabalho estão compreendidas na faixa de energia de excitação 7.5 MeV a 9.5 MeV. Os estados de ressonância do 23Mg foram populados com a interação do feixe com o alvo de natMg, e as partículas de 4He foram analisadas com o espectrógrafo Split-pole. Os espectros de posição das partículas de 4He foram então calibrados em rigidez magnética, por meio de um polinômio de segunda ordem. Após a calibração os espectros de rigidez magnética foram transformados em espectros de energia de excitação. Nesses espectros pudemos identificar e estudar a presença de contaminantes. Vários estados abaixo e alguns estados acima do limiar de decaimento foram observados e identificados. Dentre os estados acima do limiar estão os estados: 7.586, 7.648, (7.782 e 7.786), 7.855, 8.076, 8.163, 8.420, 8.453, 8.943 e 8.990 MeV do 23Mg. Sendo que apenas os estados 7.586 e 8.163 tem o spin J=5/2+ estabelecido. Ao final apresentamos uma discussã / The knowledge of the nuclear reactions that take place inside the stars allows to study how the evolution of this star will be and the relations of abundance between the isotopes of some elements. In some cases the detection of trace elements can be useful to infer about the occurrence of explosive events, as novae and the supernovae. One of these elements is the 22Na, whose abundance depends on the proton capture reaction 22Na(p, ?)23Mg. The gamma radiation photon with energy 1.275 MeV emitted by 22Na may be a novae type event indicator. Thus, the study of the resonance states of 23Mg is important to understand the mechanism of reaction and determine the 22Na abundance. The nucleus of 23Mg still participate in the cycle NeNa in the AGB phase of the evolution of average stars. With this motivation, we propose to study the spectroscopy of the 23Mg by the 24Mg(3He, 4He)23Mg neutron transfer reaction, whose experimental data were obtained in the Tandem-Orsay facility (France), using the 3He beam of energy 25 MeV. The resonances of interest for this work are in the range of 7.5 MeV up to 9.5 MeV, above the decay threshold for protons. The resonance states of 23Mg were obtained with the interaction of the beam with the natMg target, and the 4He particles were analyzed in a Split-pole spectrograph. The position spectra were then calibrated in magnetic rigidity by means of a second-order polynomial function. The effects of the contaminants were analyzed by converting the spectra into excitation energy, in which it was possible to separate the states 7.586, 7.648, (7.782 e 7.786), 7.855, 8.076, 8.163, 8.420, 8.453, 8.943 e 8.990 MeV of 23Mg. Finally we present a qualitative discussion of the angular distribution for some states and we discuss the possibilities for the future.
33

Kompaktní formy bydlení v Brně, Černá Pole / High-density, Low-rise housing in Brno, Černá Pole

Kuba, Jonáš January 2017 (has links)
The aim of the thesis is to design a compact housing with appropriate public services in the current barracks area in Černá Pole which is 16.97 ha large. The project respects existing buildings as it continues with a block structure of urban rental houses. The result is the area unification and creating a new local centre. The project strives for a functional urban development as it emphasizes the concept functionality, clarity and purity.
34

Generel bezbariérových tras v městské části Královo Pole / Generel of barrier-free routes in the city district of Královo Pole

Dubšíková, Karolína January 2020 (has links)
This diploma thesis deals with research of barrier-free design requirements in public space for Slovak Republic, Republic of Poland, Federal Republic of Germany and Republic of Austria. Then the main barrier-free design requirements for traffic structures are compared to requirements in Czech Republic. In the second part of this thesis is elaborated Generel of barrier-free routes in the city district of Královo Pole, which contains of creating four routes connecting important obejcts in the city district of Královo Pole. Following is a detailed analysis of those routes, a comparison with a decree, a methodology and a proposal for repairs.
35

RADNICE - VĚC VEŘEJNÁ, Správní centrum městské části Brno-sever / CITY HALL - RES PUBLICA, The administrative center of the district of Brno-sever

Lindovská, Lucie January 2015 (has links)
The objective was to design a new city hall for the biggest district of Brno: Brno-sever. The site determined for the new city hall is a brownfield of old barracks in Brno - Černá Pole. An important part of the task was to decide what to do with the whole area, and to find the ideal position for the nex city hall within this site. In my design, the hall is situated at the crossroad oh the Provazníkova, Jugoslávká and Mathonova street. The goal was not to overwhelm the environment, but to integrate this new building between the old and the new structure. The new city hall is remarkable by its size, mass and dark basalt facade. It is not much higher than the surrounding buildings and has only four floors. Groundfloor is dedicated to public acitivities (library, post office, community center) while the city hall itself occupies the three remaining floors.
36

Radnice Brno – Sever / New town hall for the district Brno-North

Petrík, Marek January 2015 (has links)
The building is situated into new urban structure with a simple grid of regular blocks and streets in Cerna Pole, Brno Sever. It is designed as a solitaire which enters the park with a half of his platform. The house is sunk into the ground and his parter is interestingly and playfully communicating surrounding. House was created from a modified block as inversion of its mass. The house can be entered from both sides. From the north side and from the south side. Matter is 21m high and has a and spans 42 x 49.5 m. The key element of the plan and the communication is hinged open staircase in the hall.
37

RADNICE - VĚC VEŘEJNÁ, Správní centrum městské části Brno-sever / CITY HALL - RES PUBLICA, The administrative center of the district of Brno-sever

Szabóová, Veronika January 2015 (has links)
Abstract The new Town Hall of Brno-sever is located in today´s barracks in Černá Pole. It is situated on the very prominent corner of Provazníkova street and Gen. Píka avenue. In contrast to the residential structure, the Town Hall opens to the public and creates a new square lined with trees. The Town Hall consists of three objects: the building with offices and the building with halls are connected with a bridge. The third object is the observation tower.
38

Automatizace měření EM pole měřičem Narda NBM-550 / Automatization of EM field measurement by Narda NBM-550

Kopecký, Petr January 2011 (has links)
The diploma thesis deals with the measurement of electromagnetic fields by the meter NARDA NBM 550. The aim of the paper is to introduce the possibilities of measurement of the electromagnetic field by this device, to study the feasibility of communication with computer, to create control program and to check its functionality. A description of the electromagnetic field properties is followed by the identification of the device main functions. Additionally, the operating program is described together with the draft of measuring workplace with its realization. The results of probationary measurements are presented in the end of the thesis.
39

A STUDY OF THE ELIMINATION OF THE INFINITE POLE IN THE POLE-DIPOLE ELECTRICAL RESISTIVITY ARRAY

2015 December 1900 (has links)
The pole-dipole (PD) electrical resistivity array is used as part of a geophysical technique, which can be used in exploration for mineral, geothermal and hydrological resources. Furthermore, it can be used in archaeological investigations. The PD array is useful in obtaining large depths of investigation, but the array requires one pole to be planted at a greater distance from the other electrodes. Placing the infinite pole is time consuming and costly, especially in rough terrains. It can also be a liability in populated areas. Previous data inversion software assumes the infinite pole to be planted at infinity. Therefore, the field data collected has to mimic the assumptions of the inversion software. Some recent inversion programs use all 4-electrode positions for data inversion. In this case, is a good approximation of infinity for the infinite pole still necessary? Is the depth of investigation still the same or relevant with a non-infinite, infinite pole? Is the resolution of the cross-sections retained? To answer the above questions a Generalized Electrode Array (GEA) 1 dimensional (1D) inversion program is used. Different sets of field data were collected with non-infinite pole (NIP) PD arrays; these arrays are set up as PD arrays with an infinite pole planted relatively close to or on the survey lines itself. A COMSOL finite element model were modelled with varying infinite pole distances to identify the distance required for the retention of the depth of investigation and resolution of the PD array. Modelling from GEA shows the NIP distances do not affect the 1D inversion accuracy of the resistivity nor the layer thickness. The field data indicates that it is necessary to have an infinite pole, but the distance to the infinite pole can be substantially less than 10 times the array length, which is the usual rule of thumb for infinite pole placement. With 3 dimensional (3D) COMSOL modelling results, it indicates a minimum pole distance to be 2.5-array length to retain the depth of investigation and precision of the inverted sections of the PD array.
40

Review of Alternative Construction Methods for Transmission Towers

Stevens, David John January 2014 (has links)
It is important to ensure that Transpower is prepared to deliver upcoming transmission tower refurbishment projects that are located on sites with difficult access. This project reviews the availability, capability and cost of utilising alternative construction methods and any associated wider issues. The focus of this report is on how Transpower can more effectively utilise helicopters and gin poles for transmission tower erection and material delivery on remote sites.

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