Rozprawy doktorskie (dostęp otwarty)

Permanent URI for this collectionhttps://repo.agh.edu.pl/handle/AGH/43120

Zbiór rozpraw doktorskich bronionych w Akademii i gromadzonych w Bibliotece Głównej AGH jest wyjątkową kolekcją z dziedziny nauk inżynieryjno-technicznych, nierozerwalnie związaną z procesem naukowym i badawczym Uczelni i historią edukacji technicznej w Polsce. Kolekcji rozpraw liczącej obecnie ponad 6000 tytułów, dała początek praca inżyniera górnictwa, późniejszego profesora i Rektora Akademii Górniczo-Hutniczej Witolda Budryka pt. „Ruch podsadzki płynnej w rurociągach zamulaniowych”. W dniu 10 września 1928 r. Senat Uczelni nadał Witoldowi Budrykowi, jako pierwszemu w Polsce, tytuł doktora nauk technicznych z zakresu górnictwa. W kolekcji znajdują się między innymi prace profesorów: Andrzeja Bolewskiego, Henryka Góreckiego, Jerzego Grzymka, Franciszka Nadachowskiego. Wśród nich są rozprawy dostępne online w Repozytorium AGH oraz w sposób otwarty jedynie na terminalach komputerowych w Czytelni Oddziału Zbiorów Specjalnych BG AGH.

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Access status: Restricted ,
Strukturalno-litofacjalne uwarunkowania akumulacji węglowodorów w utworach kambru syneklizy bałtyckiej
(1997-05-26) (Data obrony: 2007) Reicher, Beata
Wydział Geologii, Geofizyki i Ochrony Środowiska
The structure of the Baltic basin crystalline basement, structural covering complexes, and evolution of the tectonic regime were presented. The extent of the Cambrian system and its oil and gas productivity were characterized. For the Polish part of the basin, the stratigraphy, lithology and sedimentary environments of the Cambrian deposits, as well as the influence of lithofacial development and diagenetic processes on reservoir properties were discussed. On account of different hydrocarbon accumulation conditions in the eastern, onshore part of the basin, a method was proposed which employs seismic inversion for recognition of variations in lithofacial development and reservoir properties of the Middle Cambrian deposits. Results of the seismic inversion were transformed into models of lithofacial variability with use of statistical relationships between clay content obtained from well-log interpretation and acoustic impedance. As a result of the applied method, in undrilled zones potential sandstone reservoir horizons were identified. For the eastern part of the basin, a method of seismic data interpretation was proposed, which improves reliability of depth imaging and tectonic closure of local, low-amplitude, potential Cambrian hydrocarbon-bearing structures. To build models of velocity fields, two methods of determining the velocity distribution in the Zechstein deposits were used: the "interpretive" and "statistical" ones. High convergence of both the ways of determining the Zechstein complex velocity was demonstrated.
Access status: Open Access ,
Kształtowanie się chemizmu wód w strefie aeracji wapieni górnej jury w południowej części Wyżyny Krakowsko-Częstochowskiej
(2000-01-21) (Data obrony: 2008) Różkowski, Kazimierz
Wydział Geologii, Geofizyki i Ochrony Środowiska
The Kraków-Częstochowa Upland is geologically a unique region of vast carbonate outcrop, forming an unconfined aquifer with a complex hydraulic structure. This thesis aims to characterise the processes as well as the rainwater chemical composition dynamics during infiltration through the aeration zone. The investigations were carried out within cave systems scattered at the southern part of the Upland, mainly at the Zakrzówek horst area. Atmospheric precipitation, with a dominantly acidic character during infiltration through the soil and the Upper Jurassic carbonate environment, significantly modifies the prevalent hydrogeochemical composition. The chemistry of water depends mainly on the lithology of rocks forming the zone of aeration, thus limiting the set of possible dissolved constituents to that present in the geological structure. Diversification results from the solubility products of minerals, variable Eh, pH, thermal conditions, as well as the partial pressure of CO2. Also of significance is the velocity of the migrating solution, which is dependent upon the hydraulic structure of rocks, which determines the contact time of the solvent, being the undersaturated precipitation, with the solid rock environment. Modifications occur with variations in rainfall chemical composition, the state of soil evolution or the character of land development.
Access status: Open Access ,
Sterowanie rozkładem pola akustycznego generowanego przez źródła wielopunktowe
(2000-11-24) (Data obrony: 2009) Czajka, Ireneusz
Wydział Inżynierii Mechanicznej i Robotyki
This work is analytical and descriptive. The paper discusses ways to control distribution of sound field in the selected area, and a method for controlling distribution of sound field generated by multipoint sources. The control effect is obtained by a change of direction of maximum radiation of multipoint sound source. In this work were derived necessary formulas and presented algorithms for controlling distribution of sound field. Numerical and experimental results was nresented.
Access status: Open Access ,
Techniki symulacji agentowej w zastosowaniu do badania procesów cieplnych
(2001-04-26) (Data obrony: 2006-09-26) Bieniasz, Sławomir
Wydział Elektrotechniki, Automatyki, Informatyki i Elektroniki
The subject of this research is the problems of dynamic, complex systems modeling, in which several processes proceeds at the same time and in the common environment. The essence of the proposed modeling method lies in mapping elementary processes and their interactions, leading to achieving summary effects, that result from concurrent realization of these processes. The suggested idea is based on using the agent approach, where individual agents conduct elementary component actions, giving a result in complex processes occurring in virtual world, represented by this model. The purpose of this work is proving that such approach enables approximate but adequate mapping of the real phenomena, and in consequence predicting their course and introduction of correcting actions (control). The domain of the phenomena being analyzed is thermal processes with a special consideration of the phenomena which appear during cooling and solidification of metal castings. However, the given method is recommendation of modeling and studying a wider class of complex dynamic systems.
Access status: Open Access ,
Określenie energii udaru młotów hydraulicznych na podstawie pomiarów wybranych parametrów pracy
(2001-06-27) (Data obrony: 2007) Szykowny, Krzysztof
Wydział Inżynierii Mechanicznej i Robotyki
The doctor thesis is dedicated to the problem of the determination of the impact of hydraulic hammers, using the indirect method, basing on the measurements of hydraulic parameters. The introductory part of the thesis describes the construction and the principles of functioning as well as the rules of hydraulic hammer operation. The methods of determining the impact energy value were discussed, also the influence of the wear of hammer elements on the values and the runs of their external parameters were determined. A method to determine the hydraulic hammer impact energy was suggested basing on the measurements of the pressure values on hydraulic supply and outflow lines. A testing methodology to verify the method adopted was presented. The testing of the operational parameters of hydraulic hammers under difficult pit exploitation conditions was carried out, the elements of the measurement path were selected and verified as well as the measurement methodology was proposed. The comparison of measurement results made on a specialist diagnostic test bench (the design of the test bench was made by the AGH University of Science and Technology in Kraków with the co-operation of KGHM Polska Miedź S.A. using a strain gauge energy converter) with those performed at the mining pit bottom proved the validity of the assumptions adopted. The paper demonstrates a capability to make an engineering assessment of the hydraulic hammer under the conditions of the hydraulic hammer operation, i.e. at the mine pit bottom. The simple inspection and diagnostic procedure allows to avoid the cost related to the disassembly/assembly, transportation, use of the diagnostic test bench.
Access status: Open Access ,
Zintegrowany system nadzorowania procesu eksploatacji suwnic pomostowych
(2001-06-27) (Data obrony: 2007) Kocerba, Artur
Wydział Inżynierii Mechanicznej i Robotyki
The subject of this thesis is overhead cranes belonging to the group of large dimension rail transport devices. Much impact has been given to the monitoring system of the exploitation process of the transport means, overhead cranes in particular. The aim and argument of the thesis was based on available literature and information obtained from users of overhead cranes. The aim of the thesis is development of methods enabling integrated forming of process of exploitation of materials handling means with the use of known methods and tools. In regard to complexity of the subject the thesis discusses the process of exploitation which covers the usage and service for which the following argument was formed: as a result of integration of data collected form the processes of usage and service of the device it is possible to ensure the desired level of operational reliability. The thesis covers the following scope: model of a system of integrated process of usage and operation of the transport means (particularly overhead cranes) oriented on the relation between the operator and the transport means; method for evaluation of possibilities of performing particular action by the device and its accomplishment by the system consisting of the transport means and its operator in particular besetment; method of managing the process of exploitation of transport means oriented to intentional transport actions and to the automation of the decision process assistance in regard to exploitation process. The subject of tests consisted of a physical (real) model of an overhead crane with Q=l,5[kN] lifting capacity, laboratory overhead crane with Q=150[kN] lifting capacity and an industrial overhead crane with Q=125[kN] lifting capacity. Noting the characteristics of overhead cranes and onerousness of tests in real industrial plant conditions and availability the developed methods and tools were tested on the model first and then verified on the real objects. The comparison between test results on the physical model and the real objects confirmed their usefulness in the field of preliminary tests and validity of its design and building afterwards. Having in mind high complexity of the problem an integrated supervising system of the transport means (overhead crane in particular) exploitation process has been developed for the purpose of the thesis. This system contains the following subsystems: direct action, action assistance and action coordination. Example test results for each subsystem have been presented. They have been analyzed then in order to determine the accepted rate of system effectiveness. The exploitation test results obtained with the use of developed methods and tools together with the performed analysis show the possibility of ensuring the desired reliability in the exploitation process. Therefore it validates the arguments of the thesis. The thesis also depicts the course of future scientific projects directed towards forming of safety and reliability of overhead cranes including quality expectations of the users.
Access status: Open Access ,
Synteza i weryfikacja algorytmów konwersji protokołów komunikacyjnych w polowych magistralach rozgłoszeniowych
(2001-10-25) (Data obrony: 2008-06-11) Mikluszka, Waldemar
Wydział Elektrotechniki, Automatyki, Informatyki i Elektroniki
The subject of the thesis is to develop a methodology for synthesis and automated verification of conversion alaorithms for fieldbus communication Drotocols. Broadcast and master-slave Communications are considered. The synthesis is based on selection of suitable conversion technique, depending on communication mechanisms. It is based on successive enlargement of the set of functions that together constitute the algorithm, until the verification produces satisfactory results. Specifications of master-slave and broadcast protocols and their conversion algorithms are developed using MTL temporal logic. Liveness and safety conditions are formulated for verification with compositional method. PVS {Prototype Verification System) software is employed for automated verification. A verification scheme involving a prover module from PVS system is developed. A study of broadcast-to-master/slave and master/slave-to-master/slave conversion algorithms is presented, taking standard Modbus and CANopen, and proprietary CANpsw protocols as examples. The methodology proposed has been used for development of CANpsw-Modbus converter prototype, that operates with short cycle while transferring data for logic control and with longer cycle for continuous regulation.
Access status: Open Access ,
Kształtowanie struktury i własności infiltrowanych kompozytów na osnowie stali szybkotnącej
(2001-12-17) (Data obrony: 2007-09) Madej, Marcin
Wydział Inżynierii Metali i Informatyki Przemysłowej
The research work presented in the doctoral dissertation concerned 3 types of infiltrated composites i.e. M3/2 grade high speed steel (M3/2 HSS)-copper containing 7.5% Cu and 0.3% graphite, M3/2 HSS-iron-copper containing either 20 or 50% Fe, and M3/2 HSS-WC-copper containing either 10 or 30% WC. Fourteen HSS-based PM composites were manufactured by infiltrating both green compacts and pre-sintered porous skeletons with copper. The infiltration process comprised two stages, i.e. the production of porous bodies and the subsequent infiltration. The main objective of the research work was to evaluate the combined effects of powder characteristics and production process parameters on the properties of green pre-forms for infiltration, the infiltration itself and on the final microstructure and properties of the composites. Prior to infiltration both the green compacts and porous pre-sintered bodies were tested for density and porosity, and subjected to dilatometric measurements and fractographic studies in order to observe the morphology of capillaries. The infiltrated composites were tested for density, porosity, degree of pore filling with the infiltration metal, hardness, microhardness, transverse rupture strength, resistance to sliding wear, sliding coefficient, and resistance to oxidation at elevated temperatures. They were also subjected to microstructural studies by means of light microscopy and X-ray diffraction phase analysis. Basing on the experimental data it was possible to establish the effects of the number and type of starting components and the production route of the porous pre-forms on the final density, microstructure and properties of the infiltrated composites.
Access status: Open Access ,
Falkowe techniki przetwarzania sygnałów dyskretnych w systemach czasu rzeczywistego
(2001-12-20) (Data obrony: 2007) Półchłopek, Wojciech Tomasz
Wydział Elektrotechniki, Automatyki, Informatyki i Elektroniki
The main issue of the thesis is the development of effective methods implementing reversible integer to integer wavelet transforms (ITI) and their fast real-time signal processing applications. The new concept of the effective implementation of the ITI transform called "Fast Integer Arithmetic Wavelet Transform (FIAWT)" is presented together with its application to FPGA (DWT and undecimated DDWT). The application of the DDWT and FIAWT lifting scheme permitted an efficient implementation of the multistage prewhitening matched filters (and Wiener filters). The R&D activities for the Imaging Cosmic And Rare Underground Signals (ICARUS) particle physical experiment were connected with the development of the universal data compression and signal recognition algorithms. The implementation, mentioned above, is the full real-time realization of the concepts included in the thesis. The hardware-software applications, because of the effective compression algorithm, permitted very high compression ratios (600 times) in the ICARUS DAQ system.
Access status: Open Access ,
Wpływ mikrododatków i azotu na hartowność stali średniowęglowej z 2% Cr
(2002-01-18) (Data obrony: 2007-09-24) Staśko, Renata
Wydział Inżynierii Metali i Informatyki Przemysłowej
In work results of investigations of increased nitrogen content (in the rangę of 0.004÷0,04 %) and microalloying additions of V, Ti, Nb, Al on hardenability and austenite grain size of 0,4 %C, 2 %Cr are presented. Investigations were carried out on 26 laboratories melts. The hardenability of steels were carried out using austenitising temperature in the range 840÷1000°C. Using thermodynamic model the chemical composition of austenite as well as content of undissolved carbonitrides and nitrides were calculated and their effect on hardenability and austenite grain size was investigated. It was found, that in studied steel the increase of nitrogen content without microalloying additions decreases the hardenability of steel and increases susceptibility for austenite grain growth. However introduction microalloing additions at enlarged content of nitrogen permitted to get high hardenability at low grain of austenite at suitable temperature of hardening. Values of estimated ideal critical diameters were in the range 100 to 200 mm. Results of investigations permitted to affirm synergetic effect Mn and Cr onto hardenability of steel. Quantitative and qualitative analysis carbonitrides were carried out The effect of microalloying and nitrogen contents on mechanical properties of heat treated steel was investigated. Introduction of microalloing elements in steel with increased nitrogen content resulted in increasing tensile properties and decreasing impact strength of quenched and tempered steel.
Access status: Open Access ,
Reduction of energy losses in CMOS circuits considering die temperature
(2002-05-23) (Data obrony: 2008) Gołda, Adam
Wydział Elektrotechniki, Automatyki, Informatyki i Elektroniki
In this dissertation, the elaboration of predictive techniques used in dynamic power management has been presented. The supervisors that are dedicated to managing these predictive methods, which are based on DCT, DFS, and DVS techniques, have also been worked out. These techniques belong to rare methods of energy minimisation that take into account chip temperature. The author of this dissertation has analysed each component of energy consumption by means of theoretical investigations, simulations, and measurements. The temperature influence on each part of energy losses have also been taken into account. The considerations have been performed for wide range of technologies from 3 $\mu$m to 32 nm. The next stage is consideriation of thermal phenomena in solids and electro-thermal interactions. Using original software EThS and test chips designed by the author the electro-thermal models are matched and verified. The new predictive techniques that are based on common DCT, DFS, and DVS methods have been worked out. They are dedicated to high efficiency systems in order to keep theirs throughput on the possible maximum level. They consist in cooperation of supervisory unit with operating system that has to deliver data about the curreni and future process requirements of power consumption. The simply shape of equations, which describes the behaviour of theirs supervisors, allows dired implementation in neural networks. The presented supervisors can also be easily applied in the other hardware or software. Not only the supervisors turn a profit in energy consumption, they also gain in performance.
Access status: Open Access ,
Mikrostruktura i właściwości biomateriałów tytanowych po obróbce powierzchniowej
(2002-06-24) (Data obrony: 2006-12-05) Biel, Magdalena
Wydział Inżynierii Metali i Informatyki Przemysłowej
The aim of the study was to determine the influence of surface treatment methods on mechanical and tribological properties of metallic materials applied in medicine. The investigation was performed on titanium and Ti6A17Nb alloy after nitridation under glow discharge and after duplex surface treatment. The last method combines nickel electroless chemical deposition with a glow discharge assisted plasma treatment. Complex, quantitative and qualitative analysis of nano/microstructure of formed layers and bulk materials was carried out. Advanced methods of analytical transmission electron microscopy and atomic force microscopy were applied. Influence of surface treatments on layers topography, microhardness, Young modulus and wear friction resistance was determined. Adhesion of formed layers to bulk materials was estimated as well. The results obtained showed that hard multilayers formed during nitridation under glow discharge and duplex surface treatment significantly improve microhardness and wear resistance of the investigated materials.
Access status: Open Access ,
Wykorzystanie specjalizowanych architektur sprzętowych do realizacji krytycznych czasowo zadań sterowania
(2002-06-27) (Data obrony: 2007) Piątek, Paweł
Wydział Elektrotechniki, Automatyki, Informatyki i Elektroniki
A control of dynamic systems with controllers developed using special hardware architectures based on FPGA circuits was described in this PhD thesis. Two main hypothetical proposition were formulated:Application of controllers developed using special hardware architectures can substantially improve control quality of dynamic systems. There is possible to realize a number of classical and advanced control algorithms with usage of specialized programmable circuits. Concept of "relatively fast plant" was introduced in the thesis. It means that the relative speed of the plant dynamics was defined with reference to reaction time of control system. A computational systems that can provide control for fast plants was described. The PhD thesis contains description of selected digitization methods and selected methods providing realization of linear SISO controllers. Discussion was illustrated by example of PID controllers. The magnetic levitation system was chosen as example of a relatively fast plant. A number of experiments were performed with this plant and its mathematical model. Experiments were provided with usage of three type control systems: PC computer, microcontroller based and the last one based on FPGA circuit. The obtained results of experiments has justified the theses
Access status: Open Access ,
Budowa optymalnych modeli uczenia na podstawie wtórnych źródeł wiedzy
(2003-02-27) (Data obrony: 2008) Paja, Wiesław Andrzej
Wydział Elektrotechniki, Automatyki, Informatyki i Elektroniki
In the research a new conception of knowledge extraction from data has been developed. The characteristic feature of this approach was the multiple (i.e. by means of different machine learning tools) analysis of a primary source of knowledge (e.g. decision table), which supplied multi¬ple learning models, called here secondary sources of knowledge. Two different methods were used in the re¬ search. The first one relies on a separate optimization of each developed secondary source. The second method was distinctly different. In the first step, all developed secondary sources (decision rules) were merged together and then, the entire joined (large) model, was optimized using the same set of generic operations. To generate learning models (in the form of decision rules) a few well-known machine learning algorithms were used. In the next step, these learning models (secondary sources) have been optimized using a set of generic optimization operations. Improved models for both methods, were then evaluated - via testing the classification accuracy. To summarize results obtained, it might be stated that the optimization of learning models, using generic operations, yielded quite interesting and satisfactory results. Namely, the error rate, number of rules, average number of conditions decreased, and average value of rule strength in- creased. The improvement of learning models will play a significant role in a case of very extended models, i.e. models which contain very large set of rules.
Access status: Open Access ,
Określanie warunków elektrochemicznego otrzymywania $ZnSe$ z roztworów wodnych
(2003-03-11) (Data obrony: 2006) Kowalik, Remigiusz
Wydział Metali Nieżelaznych
The II-VI wide band-gap semiconductors are very interesting materials because of their potential application in electronic devices like electroluminescence diodes, lasers or light detectors. They can be used in producing data storage devices, display devices or multijunction solar cells. There are many methods for the preparation of these materials. Electrodeposition has been found to be a very good method to fabricate thin films of compound semiconductors. It is low-cost and simple method with many advantages as: possibility of a deposition on large surface areas (even irregular), and assures precise control of this process by adjusting several parameters. The main goal of this work is to analyze the mechanism and kinetics of the electrosynthesis of zinc selenide by electrochemical process from aqueous solution. The voltammetric, hydrodynamic and electrogravimetric measurements were carried out under following condition: concentration of $ZnSO_{4} \; \; 0,1-0,8 \; mol/dm^{3}, \; H_{2}SeO_{3} \; 0,001-0,008 \; mol/dm^{3}, \; pH=2$, temperature 25-75°C. Subsequently process of deposition was carry out under potentiostatic conditions. The influence of deposition potential, the composition and temperaturę of the electrolyte on the stoichiometry composition and morphology of the obtained deposits were examined.
Access status: Open Access ,
Analiza efektywności modulacji wielotonowej z transformatą kosinusową
(2003-04-24) (Data obrony: 2010) Dańda, Jacek
Wydział Elektrotechniki, Automatyki, Informatyki i Elektroniki
Subject of this dissertation is analysis of multitone transmission in terms of data rate and bit error rate. It focuses on data transmission in digital subscriber loop (DSL). DSL networks can use both single carrier modulations, and multitone modulations, that split input data stream into substreams, transmitted in separate frequency bands. Major advantage of multitone modulations is robustness against narrowband noise, which allows optimization of data rate. On the other hand, a big drawback is its computational complexity. Thesis are as follows: a) in a multitone transmission FFT can be replaced with the DCT, b) in a multitone transmission reduction of Peak to Average Power Ratio (PAPR) is possible, using an algorithm of low computational complexity. Key aspects include: a new constellation diagram for DCMT, design of DCMT modulator and demodulator, a detailed comparison with the DMT, and a description of a new PAPR reduction method for a multitone transmission. Simulations show that the DCMT transmission, in comparison to the DMT, allows for a greater data rate and robustness against the white noise.
Access status: Open Access ,
Symulacje Monte-Carlo procesów starzenia biologicznego i ewolucji populacji
(2003-04-28) (Data obrony: 2007) Sitarz, Mikołaj
Wydział Fizyki i Informatyki Stosowanej
Results of computer simulations of biological population evolution are presented in thesis. The basis of the model, is an influence of deleterious mutations on the mortality of individuals. Things that has been done so far using Penna model, and new results achieved by author are presented. Dissertation contains: analysis of the characteristics of decreasing number of genetic families (achieved result differ from that known from literature), effect of the genomes becoming less diverse, and the discussion on the problem of partner selection in sexual version of the model.
Access status: Open Access ,
Wpływ mikrododatków na hartowność stali z borem
(2003-05-26) (Data obrony: 2010) Pelczar, Marta
Wydział Inżynierii Metali i Informatyki Przemysłowej
The effect of microalloying elements ($V,Ti,Nb,Al$) on the hardenability, the microstructure and mechanical properties of low alloyed steel $30CrMo4$ with addition of boron in the range of $0-0.008 m.\%$ was investigated. For investigations 10 laboratory melts were used. For investigrations different methods were applied, enabling the complex analysis of the effect of the chemical composition as well as heat treatment parameters on the hardenability, microstructure and mechanical properties of investigated steel. For analysis the content of the boron dissolved in austenite and effectively decreasing the rate of its decomposition the thermodynamic model was used. The effect of dissolved boron as well as undissolved carbonitride and nitrides BN and A1N on the hardenability and austenite grain growth were investigated. The investigations of the chemical composition of steel and heat treatment on the mechanical properties of investigated steel were carried out. Results of investigations have shown, that hardenability of low alloy steel for quenching and tempering can be significantly increased by addition of $0.003\%B$ with complex addition of $0.2%\V$ and $0.04\%Ti$. Addition of V below $0.2%$ is not efficient in order to increase the efficiency of B as intensifier of hardenability especially at higher nitrogen content because the relatively low chemical affinity of vanadium to nitrogen in comparison with boron.
Access status: Open Access ,
Sieciowy system agentowy w geoinformatyce obrazowej
(2003-06-12) (Data obrony: 2007) Twardowski, Mariusz
Wydział Geodezji Górniczej i Inżynierii Środowiska
Thesis constitutes an attempt to develop method of using mobile agent system for searching and acqire imagery data, from sparse database over Internet, for the purpose of photogrammetry. It includes description of current network protocols and methods of sharing geodata used so far. Furthermore aplied mobile agent system and set of complementary written programs were presented, as well as photogrammetry basics for algorighms of those programs. Last part of thesis was dedicated to critilcal evaluation of correctness, efficiency and uniqueness of designed method. All stages of project were made with open source software. Research has proved that agent system in connection with other network transmission methods can be sucessfully used as means to obtain imagery data. Sparse database may contain aerial photos, but due to modular architecture of system its easy to expand it to support other kind of images. It's been estabilished, that thanks to designed method, time of aquiring data has reduced and realibility of data access has improved, when compared to traditional methods.
Access status: Open Access ,
Spektroskopia oscylacyjna pierścieni krzemotlenowych w strukturach krzemianów i siloksanów
(2003-09-29) (Data obrony: 2007-06-15) Jastrzębski, Witold
Wydział Inżynierii Materiałowej i Ceramiki
Silicates and siloxanes are an important group of chemical compounds. Most silicates (cyclosilicates, phyllosilocates, tectosilicates) are composed of silicooxygen rings. The aim of this work is to better understand vibrational spectra of cyclosilicates by modeling spectra of properly chosen siloxanes (which are easier to understand being the spectra of molecular crystals). Ab initio calculations for different silicooxygen clusters are the tool which permits to interpret spectra of siloxanes. As a result of such procedure, the "ring bands" in pseudolattice (600-800 cm-1) region are distinguished. Ring bands are divided into the characteristic ones (symmetric and antisymmetric involving the whole ring) and other ring bands. Furthermore, characteristic bands for $Si_{4}O_{4}, Si_{6}O_{6}, Si_{8}O_{12}$ and $Si_{12}O_{18}$structural units are described.