National Repository of Grey Literature 276 records found  1 - 10nextend  jump to record: Search took 0.07 seconds. 

Current state and prospects of scintillation materials for detectors in SEM
Schauer, Petr ; Bok, Jan
The two principal quantities are important for assessing the quality of each imaging system. Firstly, it is the detective quantum efficiency (DQE), which is primarily a measure of image noise. As the DQE is determined by signal to noise ratio (SNR), the efficient and noise-free components are the key to the high DQE. Second, not less important indicator of image quality is also the modulation transfer function (MTF). MTF describes the ability of adjacent pixels to change from black to white in response to patterns of varying spatial frequency, and hence it determines the actual capability to show fine detail, whether with full or reduced contrast. Using a scanning imaging system the fast components are the key to the good MTF. In a scintillation electron detector of scanning electron microscope (SEM) the scintillator is the most crucial component, because it significantly influences both the DQE and MTF. The aim of this study is to assess the scintillation materials suitable for SEM detectors characterized by the both high efficiency and fast decay characteristic.

Current source for measuring purposes
Chevalier, Stanislav ; Vorel, Pavel (referee) ; Patočka, Miroslav (advisor)
Goal of this semestral thesis is to design power converter which is to be used for measurement. The converter consists of two forward converters in push-pull topology. The converter is to behave as a constant current source with maximum open-circuit voltage of 1000V. Maximum current is 5A. The current range is split into three sub-ranges, to meet the strict requirements on ripple current. The range of currents is 0-5A. The operating frequency of converter is 34KHz. The converter will be charged using two portable electric generators with output voltage 230V.

Current questions of income tax (double dividend taxation)
Kouba, Stanislav ; Vítek, Leoš (advisor) ; Klazar, Stanislav (referee)
This thesis deals with the topic which si common called double dividend taxation or double taxation of corporations. It is very current topic in Czech republic in this time beacause since 1 January 2015 there is amendment of income tax code which completely changes the dividend taxation. This change can be evaluated as a one of the most progresive changes since 1989 in area of income taxation in Czech republic. This thesis will not only evaluate this change, but it will evaluate more variants of solving the problems with double taxation. The target of thesis is to find the best solution between theoretic and practicly used solutions. The next target is the analysis of these solutions from their material and procedure aspects.

Agricultural operations and their impact on the environment
BÁRTŮ, Lukáš
The thesis focuses on agricultural activities in terms of their noise influence and impact on the environment. Agricultural activities are in this particular thesis biogas plant, dryer of agricultural commodities and stable of young cattle. The aim of the thesis is the noise measurement in different areas at two different seasons vegetation season and non-vegetation season. The thesis focused on selection of appropriate locations for measurement, noise measurement nearby to the noise polluting source, noise pollution by the nearest habitation and measurement of climatic conditions. These measurements were followed by the calculation of equivalent noise level and their evaluation according to the legislation. Based on the gathered data and carried calculation it could be concluded, that the noise pollution of the agricultural activities in only contribution to the current noise pollution level. However gathered do not show values which would be significantly close to the hygienic noise limits for protected outdoor areas. In the thesis, there were also suggested noise reducing corrective actions, which could partly eliminate the noise pollution from agricultural activities.

Jan Křtitel Vaňhal- Concerto in D Major, Life and Work
Gablas, Milan ; ŽALUD, Radomír (advisor) ; HUDEC, Jiří (referee)
The thesis discusses a Czech composer living in Vienna, Jan Křtitel Vaňhal, and his concerto D major for double bass and orchestra. The aim was to contribute to better understanding of the piece so that it would be easier for many interprets to study it. The first part of the thesis focuses on the basic biography of the author and it outlines the current state of research. Chapters about the galant style and the development of classicist concerto in the second part are meant to clarify the musicological context of the piece. The third part is the core of the entire thesis. It analyses the concerto D major in the adaptation for double bass and piano and it aims to assess Vaňhal’s composition style.

Specifics of nursing care fot patients with tinitus
PÁNKOVÁ, Zuzana
Tinnitus is the technical term for an unpleasant perception of the inner sound source, i.e. for rustle, which may be known as the noise in the head, fizz and ringing in the ears. Symptoms of tinnitus feels about 15% of the population. At the age of 65 years it has been almost every second. Tinnitus is not itself considered as a disease, but as a symptom, which may be a sign of other health problems, mental and physical kind. We distinguish subjective and objective tinnitus. Objective can hear usually and another man, subjective not, it is actually audible hallucinations, which occurs in most cases. Tinnitus is considered one of the great mysteries of human ear. Exposure to intense noise increases the risk of its occurrence. For example, frequent stays in noisy ambience, such as concerts, music festivals, night clubs or listening to music players at high volume levels. An accompanying physical symptom is often a hearing loss. A possible cause may be even injuries of the head, neck, vascular disease, or just an ear inflammation. It is recommended to avoid foods with excessive levels of salt, alcohol, nicotine, caffeine and some painkillers. For the diagnosis of tinnitus is required to undergo the complex medical examination, which includes a summary of the case history, medical examination and the audiological assessment. The first step is to visit a general practitioner and an otolaryngologist. Currently there is no approved drug specifically for the treatment of tinnitus. Most treatment options are based on the suppression of tinnitus, together with a reduction of stress. The patient can be helped by improving circulation in the blood vessels and in the cochlea. Therapy can also include elements of education, such as relaxation techniques and psychological therapy. There is the possibility of alternative treatments (acupuncture). This disease is due to its character very demanding on the psyche of the patient. People affected by tinnitus complain of impaired quality of rest and sleep, but also concentration, suffer mentally and physically. Often are they irritated and due to difficulties feel the uncomfortableness, what a relationship with their surroundings disturbs even more. They can have serious psychic problems. An integral part in the diagnosis and treatment of tinnitus, is a nurse. Audiometric examination is carried out by an audiological nurse, aligns the body and the head during otoscopic examination, blood draw and obviously has great effect on the mental preparation of the patient. During therapy nurse establishes a peripheral venous catheter, it is responsible for the proper application of vasodilator infusions, which consists not only in knowledge of the principles of administration of the infusion, but also in the proper patient education. Specificity of a work of nurses in hyperbaric oxygen therapy follows from a technical background, and the need for special physical, mental training and patient education. Research investigations have revealed the specifics of nursing care for patients with tinnitus, the most important seems to patient communication and education, furthermore, a specific examination methods (audiometry), the specifics of treatment (vasodilator infusions, hyperbaric oxygen therapy). The diversity in responses of patients to tintius, the impact of tinnitus on quality of life, needs and problems of patients with tinnitus - this all are the specifics, which nursing staff should know and adequately respond to them. The research shows, that the questioned nurses have general knowledge and skills in treating patients with tinnitus. They know the available investigative and therapeutic methods, problems of patients, know how to tinnitus evaluate and observe. Striking is the fact, that one interviewed nurse has had low professional skills with blood draw, venous catheter application and could not handle the preparation and application of a vasodilator infusion.

Magnetic Resonance and its Electromagnetic Essence
MOLÁKOVÁ, Markéta
This fact is reflected in the aims of the thesis, which lie in using the Curricular Process Theory and the already researched quantum dimension of magnetic resonance for defining the electromagnetic foundation of magnetic resonance in such a form that would be suitable for students of "Radiology assistant" and other related programs. Considering the set aims and the use of applied quantitative research, the thesis presents the following hypotheses: 1) It is possible to create an educational text for students of "Radiology assistant" and related study programs by applying the Curricular Process Theory. 2) The distribution of respondents' knowledge will have a theoretical distribution similar to the normal distribution. First, it was necessary to analyse the current state of research on the subject of "Electromagnetic foundation of magnetic resonance for radiology assistants" based on the Curricular Process Theory. The present study examines the Electromagnetic Field Theory, especially the description and deduction of Maxwell's four equations for electromagnetic field, defines mathematical operators needed for describing Maxwell's equations, describes the causes of changes in electric and magnetic fields (wells and vortices), and also mathematically proves that the electromagnetic field spreads in the air a s a wave. Then, it was needed to adjust the form of these physical facts to students of "Radiology assistant" and other related study programs. It resulted in creating a simple educational text (see Appendix 1), whose suitability for the educational target group was verified by a statistical evaluation. Consequently, the first hypothesis that it is possible to create an educational text for students of "Radiology assistant" and related study programs by applying the Curricular Process Theory was confirmed. The functionality of the educational text was verified by an experimental seminar. The seminar was organised for the students of "Radiology assistant" study program at The Faculty of Health and Social Sciences at the University of South Bohemia in České Budějovice and it was accompanied by a PowerPoint presentation. The students who did not participate in the seminar were sent the educational text (and test) in the electronic form. In order to verify the knowledge gained during the experimental seminar and from the educational text, the defined electromagnetic foundation (educational text) was reflected in a test with 13 questions with four alternative options for each there was only one correct option for each question. The test was taken by respondents and the results were statistically evaluated. The type of research used in the thesis is applied quantitative research. The verification of the hypotheses was based on the use of appropriate methods of descriptive and mathematical statistics as well as the use of non-parametric testing, the so called Pearson Chi-Square test (Goodness of Fit). On the whole, 35 tests were processed. Empirical frequency distributions obtained by scoring the tests were matched with the so called Gaussian distribution. Thanks to the use of non-parametric testing, it was possible to confirm the second hypothesis that the distribution of respondents' knowledge will have a theoretical distribution similar to the normal distribution. Therefore, the statistical evaluation confirmed that the educational text is suitable for the needs and possibilities of the respondents and their knowledge distribution is close to the normal distribution. The acquired results show that the knowledge of the respondents was in agreement with the expected assumption of the normal distribution.

Optimization capital charges in VaR model utilizing dynamic risk management strategies
Kyjonková, Petra ; Baxa, Jaromír (advisor) ; Doležel, Pavel (referee)
Diploma thesis "Optimization capital charges in VaR model utilizing dynamic risk management strategies" deals with banks opportunity to reduce Basel capital requirements via estimation volatility in VaR model for separate time periods differently. It analyses current crisis, its sources, process, but especially its influence of new worldwide accepted regulatory standards, which require nearly doubled regulatory capital. Regarding high impact to industry return on equity the thesis discusses the possibility of dynamic capital optimization based on alternating conservative and aggressive risk management strategies. Empirical part of thesis tests outcomes of volatility modeling based on historical quotes of six European indexes since 2003, which are classified by volatility levels and broken down into several time periods. We suggest approach which enables financial institutions to reduce the impact of new Basel rules on their ROE, while they meet all VaR model conditions defined by the regulator. However, there are also negative consequences of this lowering level of capital represented by increasing failure rates of models. Although banks are able by suggested approach to achieve capital reduction by 20 percent, they are in the same time forced to use one of a very aggressive strategies. Dynamic...

Optimalization of CMOS Chip Interconnection Process for Higher Current Load
Novotný, Marek ; Mach,, Pavel (referee) ; Hulenyi,, Ladislav (referee) ; Szendiuch, Ivan (advisor)
This work deals with silicon chip interconnection with a view to high current up to 10A. A wire bonding method is used for interconnection. The first part of investigation is focused on the modeling and simulation by the help of program ANSYS. Thermo mechanical stressing and current density is important parts of this research. Stress and current density distribution are results of the first part. The experimental part describes transition resistance, electro migration and thermal process in the connection of wire and chip pad. A controlled current source (0 – 10A) is used for measurement. The current source makes it possible to 4-point method measurement with sampling rate 1,5MHz.

Social Networks' Business Models
Vojtěšek, Cyril ; Jandoš, Jaroslav (advisor) ; Kafka, Daniel (referee)
This paper examines popular social networks from the financial point of view. It analyses four social networks which fall into three categories: social networks (Facebook), communities (YouTube and LinkedIn) and microblogging services (Twitter). Each of these services is specific and is described in a separate chapter. The main aim of the paper is to analyze the social networks' business models. They are explained in the part two which is the most significant and largest part of the paper. It follows the first part which discusses the question whether it is possible to find out the real market value of a social network. Part three involves the author's suggestions, how to amend the current business models and if it is possible to put up a new model. The final part of the paper offers the comparison between the current situation and the situation back in the year 1999 which ended up in the burst of the dot com bubble.