Number of found documents: 2513

Pulse Generator for Φ-OTDR in VPI photonics
Čučka, Milan
English
The paper focuses on Φ–OTDR (Optical Time Domain Reflectometry) systems which need short time duration and high powered pulses for proper function, because the backscattered signal is weak for proper detection. The article includes a simulation of the signal generator for Φ–OTDR sensoric systems in simulation software. Designed generator allows to try pulses, with different time of duration, pulse repetition frequency and power. The article also includes scientific notation of backscattered signal and a short description of the used systems. Keywords: Optical fiber sensors; Pulse generator; Simulations; VPIphotonics; Φ–OTDR Available in a digital repository NRGL
Pulse Generator for Φ-OTDR in VPI photonics

The paper focuses on Φ–OTDR (Optical Time Domain Reflectometry) systems which need short time duration and high powered pulses for proper function, because the backscattered signal is weak for proper ...

Čučka, Milan
Vysoké učení technické v Brně

Comparison of Results Optained Using Monte Carlo and Ansys Fluent in Analysis Differentially Pumped Chamber
Bílek, Michal; Hlavatá, Pavla
English
The goal of this thesis is the analysis of a gas flow running through the drain channels within the apertures of differentially pumped chamber of the Environmental Scanning Electron Microscope (ESEM). This thesis contains a verification of current simulation results of gas flow within the differentially pumped chamber published by D. Danilatos using Monte Carlo method in comparison with simulation results achieved by using simulation program ANSYS Fluent, which uses the mechanism of continuum for its calculations. Keywords: ANYSY Fluent; Environmental Scanning Electron Microscope; ESEM; Monte Carlo Available in a digital repository NRGL
Comparison of Results Optained Using Monte Carlo and Ansys Fluent in Analysis Differentially Pumped Chamber

The goal of this thesis is the analysis of a gas flow running through the drain channels within the apertures of differentially pumped chamber of the Environmental Scanning Electron Microscope (ESEM). ...

Bílek, Michal; Hlavatá, Pavla
Vysoké učení technické v Brně

Sensitive Analysis of IR Heat Emitter for Soldering
Skácel, Josef; Otáhal, Alexandr
English
This paper deals with the possibility of simulation in ANSYS. Research is focused on the sensitive analysis of heat emitters. The first part is about basic properties of infrared heat emitter. For soldering is necessary to use heat emitter with the homogenous thermal field. In this case was used two types of wire arrangement. Classics spiral and type with two winding for the better homogenous thermal field. Next part deals with steady-state thermal simulation and transient simulation of heat emitter in ANSYS Workbench. Keywords: ANSYS; heat emitter; sensitive analysis; reflow Available in a digital repository NRGL
Sensitive Analysis of IR Heat Emitter for Soldering

This paper deals with the possibility of simulation in ANSYS. Research is focused on the sensitive analysis of heat emitters. The first part is about basic properties of infrared heat emitter. For ...

Skácel, Josef; Otáhal, Alexandr
Vysoké učení technické v Brně

Study of Electrochemical Behaviour of Gold Nanostructured Surfaces
Kynclová, Hana
English
Recently, nanostructured surfaces have been extensively studied due to their possibility to use them in construction of electrochemical sensors and biosensors. We have prepared tungsten working electrode modified with gold nanocolumns via galvanic deposition of gold ions through anodic alumina nanoporous template. This nanostructured surface was subsequently electrochemically characterized by cyclic voltammetry using K3[Fe(CN)6]/K4[Fe(CN)6] probe and compared with the results measured on a flat gold electrode. The electroactive areas for both types of electrodes were evaluated and compared. It was found that the nanostructured area affected the response on lower scan rates (up to 25 mV.s-1) and increased the response at higher scan rates (higher than 50 mV.s-1) which is probably related to penetration of electrolyte solution among nanocolumns. Nevertheless, this fact can help in speed of analyses of huge amount of samples. Keywords: nanostructured electrode; electrochemistry; cyclic voltammetry; gold electrode; nanoporous alumina Available in a digital repository NRGL
Study of Electrochemical Behaviour of Gold Nanostructured Surfaces

Recently, nanostructured surfaces have been extensively studied due to their possibility to use them in construction of electrochemical sensors and biosensors. We have prepared tungsten working ...

Kynclová, Hana
Vysoké učení technické v Brně

Supercapacitor Parameters Dependence on Charging Duration
Kuparowitz, Tomáš
English
Supercapacitor (SC) parameters dependence on charging time is analyzed for Nesscap 2.7V / 10F. Charging was performed using constant current in the range from 0.5 A to 5 A. Reciprocal capacitance (C-1) was calculated. It linearly decreases with applied charge. During SC charging, the effective distance of charges on electrode-electrolyte interface decreases, due to the charge distribution being altered by mobile ions inside electric field. Ions are at first moving by drift, and then by diffusion processes. Effective thickness of electrolyte negative charge is determined from reciprocal capacitance. The effective thickness varies between 2.6 nm and 2.1 nm. Keywords: Supercapacitor; electrolyte effective thickness; constant current charging; supercapacitor charging characteristic evaluation; supercapacitor charging duration; ultracapacitor Available in a digital repository NRGL
Supercapacitor Parameters Dependence on Charging Duration

Supercapacitor (SC) parameters dependence on charging time is analyzed for Nesscap 2.7V / 10F. Charging was performed using constant current in the range from 0.5 A to 5 A. Reciprocal capacitance ...

Kuparowitz, Tomáš
Vysoké učení technické v Brně

Epoxy Resin with Aaluminium Oxide Nanofiller and its Dielectric Properties
Lontrasová, Aneta
English
Topic of this paper is dielectric properties of epoxy resins, containing nanoparticles of Al2O3. Dielectric spectroscopy was used during epoxy nanocomposite diagnostics. These new materials are candidates for use in manufacturing modern insulators, where it can aid in reducing their dimensions. This research also focuses on studying dielectric properties of Al2O3 nanofiller over long periods. Large number of nanoparticles and area between them in epoxy matrix means higher number of weak spots, which may be the source of defects and may lead to increased deterioration of nanocomposites compared to composites without nanoparticles. Keywords: epoxy resin; spectroscopy; relaxation; diagnostics; Al2O3 nanofiller Available in a digital repository NRGL
Epoxy Resin with Aaluminium Oxide Nanofiller and its Dielectric Properties

Topic of this paper is dielectric properties of epoxy resins, containing nanoparticles of Al2O3. Dielectric spectroscopy was used during epoxy nanocomposite diagnostics. These new materials are ...

Lontrasová, Aneta
Vysoké učení technické v Brně

Microstructural Defects of Solar Cells Investigated by a Variety Diagnostics Methods
Škvarenina, L’ubomír
English
This paper discusses the application of a variety diagnostic methods applicable to the solar cells. More objective results about solar cells quality and reliability are possible to obtain by using a various methods. Diagnostic methods described in this paper are based on a dark and illuminated J–V characteristics, a investigation of noise in a wide range of frequency and a radiation detection at a di erent spectral range, namely by an electroluminescence and a thermography method. These methods are primarily more appropriate for a detection or a localization of microstructure defects when a reverse-bias stress is applied. However, the analysis of a forward-bias conditions is included in an investigation of J–V characteristics as well. Keywords: Solar Cells; J–V curve; Noise; Electroluminescence; Thermal Imaging; Defects Available in a digital repository NRGL
Microstructural Defects of Solar Cells Investigated by a Variety Diagnostics Methods

This paper discusses the application of a variety diagnostic methods applicable to the solar cells. More objective results about solar cells quality and reliability are possible to obtain by using a ...

Škvarenina, L’ubomír
Vysoké učení technické v Brně

Town House and the City: The search for beauty: Look up!
Kalouda, Petr
Czech
The topic is a quantitative analysis of the subjective perception of a town house and its visual factor. Its direct influence on the environment, affecting the locality and passers-by was observed. The focus is on the evaluation of the exterior and a correlation with its function and the suitability of the investment. The respondent group is composed of professionals and laymen. The correlation between the visual factor of a Town house, the attractiveness of areas and the house was unveiled. Keywords: town house; metropolitan house; satisfaction component; facade; building aesthetic; Brno Available in a digital repository NRGL
Town House and the City: The search for beauty: Look up!

The topic is a quantitative analysis of the subjective perception of a town house and its visual factor. Its direct influence on the environment, affecting the locality and passers-by was observed. ...

Kalouda, Petr
Vysoké učení technické v Brně

Earthen Space – Workshop at the Faculty of Architecture, Brno University of Technology
Neumayerova, Eva; Bazik, Lenka
Czech
The Earthen Space workshop for students of FA BUT took place in the autumn of 2020 and included a review of the teaching concept for students of architecture’s work with earth within the faculty project. This article describes the course and the content of the workshop, analyses the creation and teaching procedures from the perspective of the organisers and creators of the concept, and records the results of the project. It also assesses the potential of practical experience with earthen building material in the education of architects. Keywords: earthen building material; vocational education in architecture; earthen construction workshop Available in a digital repository NRGL
Earthen Space – Workshop at the Faculty of Architecture, Brno University of Technology

The Earthen Space workshop for students of FA BUT took place in the autumn of 2020 and included a review of the teaching concept for students of architecture’s work with earth within the faculty ...

Neumayerova, Eva; Bazik, Lenka
Vysoké učení technické v Brně

An exploratory study of Nantou Ancient Village revitalisation focusing on visual, cognitive and structural aspects
Nikodijevic, Jaksa; Grujic, Milica
Czech
In the absence of spatial diversity, there is a need for additional elements that will enable the recognition of the space in which we are. These elements are landmarks. In order for a certain thing to be considered a landmark, it must be unique and recognisable either by its properties (size, shape, colour, materialisation, etc.) or by the location where it is located in space. Landmarks and zones with a strong character provide a strong identification of the space with its peculiarity. This paper analyses the identity of the urban settlement of Nantou Old Town as a historical cluster located in the attractive location in the Nanshan District of Shenzhen City, with over 800 residential and commercial units. The study was conducted experimentally on a number of respondents who are regular or occasional consumers in Nantou settlement, through a closed questionnaire, from which we got answers to the initial questions: how successful is the revitalisation of this cultural-historical settlement, what are the landmarks, how simple is orientation through the settlement and what method is most common in wayfinding (landmark or navigation app), does a consumer’s choice in wayfinding device and landmark physical characteristics (colour, texture and form) depend on personal dimensions (gender, age, educational level and familiarity with environment). Keywords: wayfinding; landmarks; navigation app; Shenzhen City; Nantou ancient village Available in a digital repository NRGL
An exploratory study of Nantou Ancient Village revitalisation focusing on visual, cognitive and structural aspects

In the absence of spatial diversity, there is a need for additional elements that will enable the recognition of the space in which we are. These elements are landmarks. In order for a certain thing ...

Nikodijevic, Jaksa; Grujic, Milica
Vysoké učení technické v Brně

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