Algorithm for Calculation of Radiation View Factors

Tato práce se zabývá výpočtem úhlových faktorů pro přenos tepla radiací. Práce obsahuje matematický popis problému a zabývá se jeho numerickým řešením. Hlavním cílem této práce je vytvoření algoritmu pro výpočet úhlových faktorů pro zadané 3D geometrie a jeho využití pro posouzení tepelného toku. Jako vstupní data slouží CAD modely jednotlivých geometrií popsané pomocí formátu NASTRAN. Výstupem z algoritmu je pak matice úhlových faktorů. Algoritmus je naprogramován v prostředí MATLAB, pro popis modelů pomocí formátu NASTRAN však využívá STAR-CCM+. Algoritmus je navržen i pro výpočet na počítačovém clusteru pro případ složitých geometrií s uvažováním stínění.This thesis deals with a calculation of radiation view factors. The thesis includes mathematical model of the problem and its numerical solution. The main aim of the thesis is the creation of an algorithm for calculation of radiation view factors for given 3D geometries and its application for the heat flux analysis. CAD models of geometries, specified by a NASTRAN file format, are used as an input of the algorithm. Matrix of radiation view factors serves then as an output of the algorithm. The algorithm is programmed in MATLAB, but STAR-CCM+ is used for the NASTRAN specification of separate models. The algorithm is also designed for a computation on a computer cluster for cases of intricate geometries with consideration of shading areas.

The multistorey office building

Návrh nové ocelové nosné konstrukce administrativní budovy ve Zlíně. Budova se skládá ze tří částí. Konstrukce části A je tvořena třemi poli v příčném směru a pěti poli v podélném směru, o dvou nadzemních podlažích. Konstrukce části B je tvořena dvěmi poli v příčném směru a třemi poli v podélném směru, o šesti (5) nadzemních podlažích. Konstrukce části C je tvořena dvěmi poli v příčném směru a pěti poli v podélném směru, o dvou (3, 4) nadzemních podlažích. V obou směrech ve všech částech budovy je osová vzdálenost sloupů ve všech polích 6,0 metrů. Konstrukční výška všech podlaží je 3,5 metrů. Návrh tvaru a rozměrů konstrukce. Stálé, užitné, klimatické zatížení. Výpočet vnitřních sil a dimenzování hlavních nosných prvků pro tři varianty konstrukčního systému. Porovnání variant. Statický výpočet, výkresová dokumentace pro vybranou variantu. Výrobní výkres části budovy.Design of a new steel structure administrative building in Zlín. Structure is consist of three parts. The part A is designed of three fields in the transverse direction and five fields in the longitudinal direction. This part is two-storey. The part B is designed of two fields in the transverse direction and three fields in the longitudinal direction. This part is six-storey (five-storey). The part C is designed of two fields in the transverse direction and five fields in the longitudinal direction. This part is four-storey (three, two-storey). In both directions in all parts of the building is the distance between the columns in all fields of 6,0 meters. Structural elevation of all floors is 3,5 meters. Shape and dimension design. Fixed, utility, climatic load. The purpose is confrontation of inner forces and dimensioning of main supporting elements in three variations of structure. Comparsion of variations. More detailed static calculation, drawings for the selected variant. Detailed drawings for part of building.

High Voltage Switchgear Thermal Distribution Analysis

Cílem této práce je analýza teplotního pole vysokonapěťového rozvaděče. Tato analýza je založena na kombinaci experimentálního měření a CFD simulace proudění vzduchu v prostoru rozvaděče. Na základě výsledků pro referenční geometrii jsou předloženy návrhy na úpravu topologie rozvaděče, které mají za cíl snížení teploty kritických komponent rozvaděče během jeho provozu. Druhá část práce je spojena s problematikou oteplení plošných spojů, jakožto hlavních zdrojů tepla v prostoru rozvaděče. Pro popis závislosti oteplení plošného spoje na jeho charakteru byla použita statistická metoda design experimentu. Výsledky z experimentálního měření jsou podpořeny konečně prvkovým modelem kontaktu spoje.This thesis deals with analysis of thermal field inside high voltage switchgear cabin. It de-scribes applied methodology based on combination of CFD simulation of air flow inside switch-gear cabin and series of experimental measurements. Based on results for reference geometry it provides proposals of switchgear layout modification to decrease temperature rise on switch-gear critical components during its operation. In the second part of this thesis problem of bus-bar joints is discussed. Busbar joints are one of the key thermal sources inside switchgear cab-in. Statistical method of design of experiment is applied for experimental investigation of bus-bar joint temperature rise. Results from design of experiment are supported by finite element simulation of contact in busbar joint.

The use of computed tomography for control homogeneity of steel fiber-concrete structures

Inappropriate processing of and deposition the mixture during the manufacturing process fiber-concrete structures, the fibers are often unevenly distributed. May experience a grouping of wires, which reduces the overall homogeneity and the quality of steel fiberconcrete structures. The paper deals with the development for monitoring the distribution of fibers in hardened steel fiber-concrete structures using industrial computed tomography.Nevhodným zpracováním a ukládáním směsi během výrobního procesu drátkobetonu jsou vlákna často nerovnoměrně rozložena. Může docházet k seskupení drátků, což snižuje celkovou homogenitu a tím kvalitu drátkobetonových konstrukcí. Příspěvek se zabývá možnostmi kontroly rozložení vláken ve ztvrdlém drátkobetonu pomocí průmyslové tomografie

High-resolution electric field and temperature distributions in positive streamers

In this work, we aim to take a detailed experimental picture of the positive streamer. We apply optical emission spectroscopy to the first negative system (FNS, (Formula presented.)) of (Formula presented.) and the second positive system (SPS, C3Πu → B3Πg) of N2. Large, centimeter wide, and highly reproducible streamers are created in pure nitrogen and synthetic air, at pressures ranging from 33 to 266 mbar. Direct time resolved spectral imaging of the space charge layer resulted in spatiotemporal maps of the calculated reduced electric field strength (E/N) and rovibrational temperature in sub-nanosecond and sub-millimetre resolution. The E/N peaks at approximately 540 and 480 Td, directly in front of the space charge layer, for synthetic air and pure nitrogen respectively, as determined by using the intensity ratio method of FNS and SPS. A global model for pure nitrogen in PLASIMO uses the experimentally determined E/N distribution to draw a picture of the gas kinetics around the space charge layer passage. In addition, the results of the global model serve as a reference to interpret the rotational and vibrational temperatures obtained from experimental FNS and SPS emissions.</p

Cement Kiln By-Pass Dust: An Effective Alkaline Activator for Pozzolanic Materials

Cement kiln by-pass dust (CKD) is a fine-grained by-product of Portland clinker manufacturing. Its chemical composition is not suitable for returning back into feedstock and, therefore, it has to be discharged. Such an increasing waste production contributes to the high environmental impact of the cement industry. A possible solution for the ecological processing of CKD is its incorporation into alkali-activated blast furnace slag binders. Thanks to high alkaline content, CKD serves as an effective accelerator for latent hydraulic substances which positively affect their mechanical properties. It was found out that CKD in combination with sodium carbonate creates sodium hydroxide in situ which together with sodium water glass content increases the dissolution of blast furnace slag particles and subsequently binder phase formation resulting in better flexural and compressive strength development compared to the sample without it. At the same time, the addition of CKD compensates the autogenous shrinkage of alkali-activated materials reducing the risk of material cracking. On the other hand, this type of inorganic admixture accelerates the hydration process causing rapid loss of workability

Chemical composition and antimicrobial properties of the essential oils of two Guadua Kunth species (Poaceae-Bambusoideae)

Bamboos are described as one of the most important renewables, easily obtained, and valuable of all forest resources. Brazil is the country with the greatest diversity of bamboo species in the New World [1]. One of the most important bamboo groups growing in South America belongs to the Guadua genus, from which two species, G. angustifolia Kunth. and G. chacoensis (Rojas Acosta) Londoño & P.M. Peterson, are morphologically closely related. Due to the taxonomic difficulties presented by the Guadua complex, the main objective of this work was to evaluate the potential of their volatile oils for distinguishing the closely related species and to evaluate new potential applications for these plants. Leaves of the taxa were collected at an Experimental Unit from the Agronomical Institute from Campinas (IAC) located in Tatuí-SP. The essential oils were obtained by hydrodistillation for 4 h, and component identification was performed by GC/MS [2]. The yields were found to be 0.027% and 0.00079% (w/w), for G. angustifolia and G. chacoensis, respectively. Terpenes and terpene-related compounds accounted for most of the compositions of the two samples. The major compounds of G. angustifolia oil were hexahydrofarnesyl acetone (23.1%) and (Z)-phytol (21.3%), while G. chacoensis oil was characterized by (E)-β-ionone (8.8%), hexadecanoic acid (6.8%), hexadecenoic acid (6.5%), (Z)-phytol (5.3%) and (E)-α-ionone (5.0%). The antimicrobial activity was assayed by a microdilution method in microplates [2] against Aspergillus brasiliensis, Candida albicans, Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus; none of the oils exerted any considerable activity (MIC > 250 µg/mL), as only extracts with MIC < 100 µg/mL can be considered as candidates for developing new antimicrobial agents [3]

Project management of information system implementation

Hlavním tématem této práce je metodika projektového řízení aplikovaná na implementaci informačního systému. Jedná se o analytické zpracování a zhodnocení postupů a metod managementu modernizace procesů správy a řízení zásob a výnosů v podobě prodeje vstu-penek v prostředí příspěvkové organizace ve státní správě České republiky. Cílem bakalářské práce je vybrat vhodný standard projektového řízení, využít tyto znalosti pro analýzu realizovaného projektu a následně k sepsání doporučení pro zvýšení efektivity projektového řízení v organizaci Muzeum v Bruntále. Teoretická část se zabývá poznatky z odborné literatury na zvolené téma. Jsou zde zmíněny světově uznávané standardy projektového řízení, z nichž je vybrána optimální metodika pro praktický příklad. Práce se podrobně zabývá řízením projektu podle PRINCE2, zachycuje aplikovatelné metody a postupy, které poté aplikuje na zvolený projekt. Analytická část představí příspěvkovou organizaci Muzeum v Bruntále, která se v minulém roce rozhodla pro modernizaci jedno z jejich klíčových informačních systémů. Konkrétně se jedná o rezervační systém, jehož hlavní funkcionality jsou tisk a správa vstupenek, elek-tronická správa stavu zásob a kontrola správního oddělení organizace nad jednotlivými objekty. V podrobném zpracování se práce zaměřuje od procesu plánování, rozhodování a samotného zavádění systému až po analýzu nákladů a přínosů pro podnik. Dosažené poznatky a nalezená doporučení může vedení organizace Muzeum využít pro kontrolu již realizovaného projektu a pro případné upravení interní podnikové metodiky projektového řízení.The main theme of this thesis is a project management methodology applied to the imple-mentation of an information system. A nonprofit organization in the state administration of the Czech Republic is implementing a new system supporting processes of inventory gov-ernance and revenue in form of ticket sales. The management procedures and methods are analytically processed and evaluated. The aim of the thesis is to choose the appropriate standard of project management. Use this knowledge to analyze the completed project and subsequently find a recommendation to enhance the effectiveness of the project management in the organization Muzeum v Brun-tále. The theoretical part is focused on the expert knowledge from literature on the selected top-ic. In the thesis there are mentioned internationally recognized project management stand-ards. One of them is selected as an optimal methodology for the practical example. The paper describes project management using PRINCE2, it captures applicable methods and procedures, which are then applied to the selected project. Analytical part introduces organization Muzeum v Bruntále. The organization decided to modernize one of their key information systems last year, specifically the system for reser-vations. The main functionality of the system is printing and management of tickets, e-governance by electronic inventory control. The main part of the paper focuses the process of planning, decision making and implementation of the system itself to analyze the costs and benefits for the company. Achieved findings and recommendations can help the management of the museum to check the completed project or the management can improve the internal corporate meth-odology of project management

Implementation of Voice Transmition Quality Algorithms on Mobile Platform

katedra měřen

Medication Application As a Nursing Activity

This bachelor thesis focuses on medication administration as a nursing activity and has two main objectives. The first one was to identify mistakes made by nurses when preparing medication or applying medicaments to patients. Another was the analysis of the views of general nurses on the appropriateness of the use of certain medical aids and equipment related to the preparation and administration of drugs and their actual use in their clinical practice when working with patients. This thesis outlines the basic theory of drugs, methods of preparation, various ways of administration to the patient and also possible mistakes that the general nurses may make when handling drugs. Furthermore, the thesis presents results of research conducted during clinical practice in the hospital, which focuses on the proper preparation and administration of drugs by general nurses. The research was based on the covert observation of 20 general nurses working in different hospital wards. It focused on compliance with selected hygiene and safety rules when handling drugs and the use of selected aids to prepare the application of drugs to patients. In addition, the answers from the questionnaire survey, which was attended by 62 general nurses from various medical facilities, but mainly from hospitals, are analysed here. Using statistical methods, hypotheses concerning the influence of age, gender, education and length of practice of general nurses on the use of selected nursing aids and compliance with selected rules were tested. In conclusion, the most important findings concerning the satisfaction of general nurses with the current system of preparation and application of drugs at their workplaces are given, as well as the findings concerning non-compliance with certain hygienic standards. Finally, recommendations are presented that the hospital should adopt in order to increase the awareness of general nurses about this problem and to arrange a remedy