Experimental work is based on measurement of temperature dependence of noise using helium cryostat and study of amplitude and mean time of capture and emission as a function of electric field intensity and charge carrier concentration in channel. These results will be used to improve generation-recombination model of noise origin and localization of traps. Tutor: Pavelka Jan, doc. Thesis deals with a study of electromagnetic emission EME signals and description of their features in order to experimental study of degradation processes, leading to total destruction of model specimens under mechanical loading, and localization of these processes.
EME signals are of stochastic nature and are processed by similar principles as those, which are used in speech recognition.
Electronic Noise and Fluctuations in Solids by Sh. Kogan (1996, Hardcover)
Aim of the work is determination of appropriate signal features of emission events in time domain, frequency domain and time-frequency domain. The subject of the research will be the studies of the properties of nanocomposites for electrical insulating products for high-voltage applications, e. The objective of the iresearch work will be the implementation of nanoparticles into electrical insulating compounds with the aim to improve their properties, in particular their electric breakdown strength and ability to withstand partial discharges and electric treeing and to reduce their dielectric losses.
Tutor: Liedermann Karel, doc. Decreasing the dimensions in integrated circuits currently 32 nm brings about an increase of interconnect capacitance and thus the reduction of the signal propagation speed. The limiting factor for a further improvement of electronic device performance thus become not the properties of semiconductor devices themselves but rather interconnect delays and, hence, too, high magnitudes of parasitic capacitances. One of the options for the reduction of interconnect capacitances is the reduction of the permittivity dielectric constant, k of thin-layer insulating layers capacitance is directly proportional to permitivity.
Two major routes are available: replacement of polar Si-O bonds with less polar Si-F or Si-C bonds or raising the porosity intentional introduction of air voids. The work on this topic will require experimental work in sample preparation and design, studies of the theory of low-k dielectrics and the measurement of electrical properties of developed material systems. The subject of the research will be dielectric properties of nanocomposites for electrical insulation. These materials are based on thermosetting resins, mostly epoxides, containing finely dispersed SiO2, TiO2, Al2O3 or WO3 microfillers and nanofillers, eventually more complex chemical formulations.
The presence of nanoparticles with dimensions of some 10 — 20 nm favorably affects the withstand capability of nanocomposites to partial discharges and electrical treeing and, hence, the breakdown strength as well as the degradation resistance.
This in turn brings the possibility to manufacture electrical equipment e. An important issue concerning all nanocomposites is the presence of a large number of interfaces. They are to due to the presence of nanoparticles with complex shapes neither planar nor spherical.
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These interfaces exhibit a low stability, which may later cause substantial changes of electrical properties in the course of ageing. One of the objectives of the proposed research would therefore be to study the behavior of nanocomposites in the course of accelerated ageing. The work on this topic will require experimental work in sample preparation and design, studies of the relation between microphysical structure and electrical properties and the measurement of electrical properties of developed material systems.
The objective of the research is the investigation of electrical properties of CCTO ceramics i. Attention will be focused toward the identification of mechanisms leading to high dielectric constant permittivity of the order — and, subsequently, on the modification of CCTO ceramics formulation in order to reduce dielectric loss and to extend the frequency interval, in which the dielectric constant retains its high value, up to the GHz range Materials exhibiting high permittivity are needed for new applications, particularly in integrated circuits and in capacitors.
In capacitors, high-k dielectrics are used in order to attain higher energy densities and thus to reduce the size of capacitors themselves. The work on this topic will require experimental work in sample preparation and design, studies of the theory of high -k dielectrics and the measurement of electrical properties of developed material systems. Micro-cracks creation in mechanical loaded solids is accompanied by origin of electromagnetic EME and acoustic AE signals. These signals may be used for study of micro-cracks formation evolution, their characteristics finding and their localization.
EME and AE methods are usable in electrical engineering, mechanical engineering, civil engineering or in geophysics. The goal will be determination of micro-cracks primary parameters and their localization in concrete, granite and in modern composite materials for structural applications. Analysis of EME and AE signals origin and propagation will be performed in these materials and models will be suggested.
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- electronic noise and fluctuations in solids.
The methodology for determination of selected primary parameters and micro-cracks localization will be suggested and verified. The solution of hydraulic press control via PC and realization of automated set-up will be an important part of the work. Supercapacitors are used as peak power sources mostly in automobile industry and space applications.
Expected life time of components in space applications is 10 years at least. Long term reliability estimation is in the meantime based on the monitoring of the electrical parameters change after the accelerated life tests. The components passing the tests with parameters values in the given limits are certified for the further use.
Product | Electronic Noise and Fluctuations in Solids
It can be supposed, that the accelerated life tests create additional defects in the studied structures. Within the PhD. Key learning outcomes. Occupational profiles of graduates with examples. Issued topics of Doctoral Study Program.
Advanced methods for measurement and analysis of solar cell loss-making mechanisms in the process of their conversion efficiency improving A large number of inhomogeneities and defects appear in solar cells during their manufacturing due to their large surface area. Electronic noise as another information source for detection in sensorics Thesis deals with a study of elctronic noise in order to develop a non-traditional technique for evaluation of output sensor signal considering direct component and also its fluctuation.
Fiber-optic sensors for passive NDT methods Fiber-optic sensors offers wide spectrum of applications nowadays. Characterization of structural defects of perspective thin-film solar cells Subject of doctoral thesis will be non-destructive study of defect regions in the structure of perspective Cu InGa Se2 thin-film solar cells. Modern methods for study of solar cell characteristics The main problem in the process of the solar cell conversion efficiency and service life improving is to find their basic parameters.
Radiation transfer in electric arc plasma Radiation energy transfer influences significantly physical processes occuring in the plasma, it plays important role in many devices in plasma processing devices. Source characterization of electromagnetic emission using signal features Thesis deals with a study of electromagnetic emission EME signals and description of their features in order to experimental study of degradation processes, leading to total destruction of model specimens under mechanical loading, and localization of these processes.
Study of dielectric and insulating materials with low permittivity Decreasing the dimensions in integrated circuits currently 32 nm brings about an increase of interconnect capacitance and thus the reduction of the signal propagation speed. Study of electrical insulation materials containing nanoparticles The subject of the research will be dielectric properties of nanocomposites for electrical insulation.
Electronic zero-point fluctuation forces inside circuit components
Add a Book Review. Electronic Noise and Fluctuations in Solids. Author: Sh. Publish Date: Aug 28, Details Description Reviews Author: Sh. Publisher: Cambridge University Press. Weight: 2. Product Description. Customer Book Reviews Five Stars. Nice book, covers important details on the subject and is very well written. Four Stars.