Paata Kervalishvili

Paata Kervalishvili
Georgian Technical University · Engineering Physics

PhD, Dr.Sci. Phys-Math.

About

103
Publications
2,945
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186
Citations
Introduction
Quantum Information Technology, Quantum Biophysics, Physics of Nanosystems

Publications

Publications (103)
Conference Paper
Full-text available
This work is about Silicone solar cell efficiency improvement by Graphene lamination
Article
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Atoms and molecules are known the smallest blocks of the matter. However, their substructure represent matter identification, but not sufficient to explain material physical properties like ductility, strength, work function, etc. Today matter structure (atoms or molecules arrangement) investigating is a stationary approach that particles are assum...
Chapter
The main task of this chapter is to comprehensively analyze the spectroscopic properties of nano-bioparticles and estimate oscillation/vibrational modes and the possible resonance wavelength range for the determination of the unique spectra of viruses. The work consists of computer simulation study of nano-bioparticles’ physical properties and met...
Article
Nowadays, water scarcity is one of the most important subject that many scientists are involved. On the other hand, environment pollution is another worrying problem what increase water scarcity via resources pollution. Both effect on human live, then finding comprehensive alternative is inevitable. Natural hydrologic water cycle (Macro Cycle) inve...
Chapter
Full-text available
Nowadays Nanomedicine & Specifically Targeted Drug Delivery has been developed. One of the important factors in DDS is control. DDS promise us control. But controlling in DDS is a little different from macro-controlling. In this article we try to get an overview about DDS and controlling on it. We start with Nanomedicine and in the following we tal...
Conference Paper
The aim of the paper is development of dynamic fractal concept which provides the possibility of study and elaboration of model of substances with small scale structures.
Patent
Photovoltaic silicon solar cell efficiency improvement by graphene thin film is the goal of the patent
Conference Paper
Nowadays, Nanotechnology is one of the most important approach what could be traceable in different applications. Refer to achievements, Nanotechnology via Nanosystems improvement able to create more efficient and feasible systems which solve many crises in the world. According to Feynman idea as the founder of Nano concept, “there is plenty of roo...
Article
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Method of studying spectroscopic properties of nanosized particles and estimation of resonance wavelength range for determination of specific and unique “spectral” signatures in purpose of sensing, identification of nanobioparticles, viruses is proposed. Elaboration of relevant models of viruses, estimation of spectral response on interaction of el...
Conference Paper
Full-text available
Method of studying spectroscopic properties of nanosized particles and estimation of resonance wavelength range for determination of specific and unique "spectral" signatures in purpose of sensing, identification of nanobioparticles, viruses is proposed. Elaboration of relevant models of viruses, estimation of spectral response on interaction of el...
Article
Nowadays, water scarcity beside pollution is one of the most complicated problem in the world that many scientists are involved to find solutions. Most of the alternatives are based on saving and pollution prevention. However, they are useful, but not sufficient in large scale. Pollution not only damage to environment resources, but also decrease f...
Article
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Among the effective and precise energy generation technologies, an ultrasonic wave is one of the most interesting and applicable proximate sources. In order to understand the nature of ultrasound, it is necessary have a basic understanding of sound waves, how they are generated and how they travel through a conducting medium. Ultrasonic waves affec...
Article
Water as the most prominent substance on the earth, needs treatment to use. On the other hand, different impurities with different physical or chemical specifications should be purified by specific additive materials and methods. Recently, Nanomaterials as additives instead of common materials have been used to eliminate water impurities what made...
Chapter
Full-text available
Nowadays Nanomedicine & Specifically Targeted Drug Delivery has been developed. One of the important factors in DDS is control. DDS promise us control. But controlling in DDS is a little different from macro-controlling. In this article we try to get an overview about DDS and controlling on it. We start with Nanomedicine and in the following we tal...
Chapter
Latest achievements of the Georgian scientists in the field of chemical engineering, metallurgy and microwave engineering can facilitate the development and implementation of combined industrial technologies for complex processing of used tires, plastics and other inert polymers, agricultural waste, manganese bearing waste and lowgrade ores and a p...
Chapter
Using reflectance anisotropy spectroscopy and atomic force microscopy we show that the structure and optical anisotropy of CuPc molecular thin films grown on oxidized GaAs(001) depend on a type of the substrate doping. The film grown on the n-doped substrate has the uniform column structure and the largest scale of optical anisotropy, whereas the f...
Chapter
A synchrotron-radiation photoemission study of the electronic structure of the clean SiC(111) surface and the ultrathin Ba/SiC(111) interface has been first performed. The SiC sample is grown by a new method of epitaxy of low-defect unstressed nanoscaled silicon carbide films on silicon substrates. The process of the Ba/SiC(111) interface formation...
Article
The boundary problem discussed concerns the energy state of an electron in a system of immovable electrically charged particles. The main principle followed was that the atoms of the substance (neutral and ionized) are not themselves systems and consist of discrete material particles (the Rutherford model). According to the principles of unified fi...
Conference Paper
Energy play roles in all of human aspects then today find a reliable source is one of the most important subjects. A suitable energy source, should response different points of view such as quantity and environment side effects. Nowadays, fossil fuel is the main energy source in the world but it is exhaustible and it emits gases that damage enviro...
Conference Paper
Full-text available
Nowadays quantum information science and technology is in a state of theoretic completeness; much is invested to research quality physical solution for quantum computer and applications, so the field is led by physicists and information science and technology professionals. In this paper we'll try to present and analyze the philosophy and nature of...
Article
Ultrasonic wave as a high frequency longitudinal wave passes through liquid, makes acoustic cavitation and forms fine bubbles in low pressure region of fluid. Because of pressure decrease thermodynamic phase changes the liquid to gas. Liquid atomizing effect, which produces the fine nanoparticles of liquid, is the basis of the water purification. U...
Chapter
Experimental research was carried out using representative samples of manganese processing waste disposed in Georgia to achieve secondary recovery of high-purity metallic manganese and form the waste. Manganese hydroxide obtained through microwave ammonium chloride processing of manganese containing sludge was used for obtaining manganese sulphate,...
Chapter
In the modeling process of big systems such as different disasters, one of the main points is data collection: data quantity and quality, its manifold and accuracy. The modeling of this kind of processes includes: data mining and recognition (creation of a database), data processing and treatment (knowledge base preparation), and elaboration of con...
Chapter
A comparative study of the nitride and sulfide chemisorbed layers as the surface passivants are done for (100) surfaces of InAs and GaAs. A chemical model which describes formation of such layers in hydrazine-sulfide and water sodium sulfide solution is developed. According to the model after wet chemical treatment in the hydrazine – sulfide soluti...
Chapter
The present work deals with the recent developments of Georgian scientists and scientific institutions in the field of microwave enhanced processing of mining and metallurgical, polymeric, agricultural, municipal, medical, phytoremediation and radioactive waste and microwave assisted synthesis of nanoparticles and nanomaterials, which can form a sc...
Chapter
Full-text available
The ability to detect rapidly, directly and selectively individual virus particles has the potential to significantly impact healthcare, since it could enable diagnosis at the earliest stages of replication within a host’s system. Simultaneous acquisition of the vibrational and electronic fingerprints of molecular systems of biological interest, at...
Article
Georgia could serve as a unique natural testing ground for the development of green industry using advanced technologies for industrial processing of hazardous waste. The goal of the reported work was to improve on the current methods of reprocessing waste by using a combination of a microwave enhanced method of processing used tyres and plastic re...
Book
This collection of selected review papers focuses on topics such as digital radiation sensors and nanosensory systems for nanotechnology applications and integrated X-ray/PET/CT detectors; nanophosphors and nanocrystal quantum dots as X-ray radiation sensors; the luminescence efficiency of CdSe/ZnS QD and UV-induced luminescence efficiency distribu...
Article
Existing energy generation and distribution systems of the South Caucasus were inherited from the Soviet era and are deficient for ensuring sustainable energy security. Paradoxically, all the three countries of the region - Armenia, Azerbaijan and Georgia - are experiencing a shortage of energy resources since the 2005s and are obliged to import di...
Conference Paper
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The geometrical behaviour of the conductivity of gold coated textiles for applications in textile electrodes, to be used in measuring biomedical signals is examined. Flexible fibrous sensors in dimensions of 3x3cm from Kevlar yarns coated with gold were produced. The deposition steps were optimized and the obtained layers are characterised with dif...
Conference Paper
Full-text available
In the last decade quantum information theory and technology evolve and show their great potential. There are a set of problems for which it's more efficient and even not possible with classical communication to solve than with quantum equivalent. The best known example is Quantum Key Distribution (QKD), though there are quantum non-locality (entan...
Chapter
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Solid state nuclear track detectors (SSNTDs) have been widely used as sensors of radon and progeny in long-term dosimetry because they exhibit high detection properties while their cost is very low. Alpha-particle energy calculating codes, specific for every incident particle, increase the Monte-Carlo simulation time significantly. The expression o...
Conference Paper
Last achievements in information science and technology illuminated some important approaches and ways to increase the human security through different scientific methods and technology innovations. Elaboration of new information systems including nanosensory instruments and quantum sensory devices create the unique possibilities to develop new met...
Article
The structure of an active Erbium-Doped Distributed Bragg Reflector (ED-DBR) and a Fiber Bragg Grating (ED-FBG) is simulated using a rigorous transmission line model and an approximate version of the coupled-mode theory, respectively. The basic calculation steps and assumptions of the proposed simulation models are described and the key parameters...
Article
Development of sensory elements, devices and novel information technologies based systems is unique for solving organization difficulties of multiparametral and precise measurements of hydrocarbons and related substances. An effective prevention implies sensory system that provides combines and interprets applicable individual information in due ti...
Article
Existing energy generations technologies both electrical and thermal based on the burning of natural energy carriers are dangerous for biosphere of our planet. It became obvious that the further intensive development of modern energetic and transport leads to large-scale ecological crisis. During last decade attention of worldwide frontier research...
Article
Quantum effects in nanostructured magnetic solid state materials open the new ways for preparing the novel electromagnetic devices with unique characteristics. At the same the electron spin based quantum effects are fully determined of formation and growing properties of molecular clusters of these solid state materials which are united in plane an...
Chapter
Quantum computation can be understood as a generalization of classical computation: The possible states of a quantum computer are superposition of bit strings, where the tensor factor is called a quantum bit or qubit. To evaluate the computational complexity of an algorithm, either classical or quantum, it is necessary to specify a set of elementar...
Chapter
Modern molecular nanotechnology methods and tools make possible to manipulate of nano scale disorders and create principally new materials and devices for information technologies operating as charge, and spin degree of freedom of carriers. The central task of such researches is creation of nano structured materials with different electro magnetic...
Article
In this paper the dependencies between the relaxation period of electrons and the energy of mobility and temperature in a quasi-two dimensional, nondegenerate semiconductor nanostructure, using a common model of the admixture centre, are calculated. The electrons' relaxation period and their mobility depend on the depth of the nanostructure, and ev...
Article
This paper deals with the generalization of the problem of sustainable development, the concept of which is based on the assumption that societies need to manage three types of resource (economic, social, and natural). The field of sustainable development can be conceptually broken into three constituent parts (subfields): environmental sustainabil...
Article
A teqnique for preparing of Pr2S3 crystalline thin films through vacuum-thermal evaporation from independent sources of component is developed. The films deposited are doped with lead and cadmium atoms. The reflectance and transparence spectra of the films are measured in the photon energy 0.2-3.3 eV at 300 K temperature. The frequency analysis of...
Article
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The structural and transport properties of GaAs / Mn / GaAs / In <sub>x</sub> Ga <sub>1-x</sub> As / GaAs quantum wells (x≈0.2) with Mn  δ -layer (4–10 at . %) , separated from the well by a GaAs spacer, have been studied. The hole mobility in the investigated structures has exceeded the values known for magnetic III-V heterostructures by two order...
Chapter
It is shown that performed technological, physical-mechanical andradiation tests clearly indicate the prospects of using Neutron Absorbing Elements (NAE) based on B-10 and some rare-earth compounds during the creation of highly effective Control and Safety System (CSS) rods for fast neutron nuclear energetic reactors. Particular attention was paid...
Conference Paper
A complex system by definition is open; its boundaries in accordance with the system's nature must be transparent, and the same time characteristic feature of complex systems is nesting. Following these, paper is consecrated to the new algorithm of the optimal distribution of material, energy or informational fluxes in the big dimensional and compl...
Article
The aim of this paper is to give a brief overview of recent advances in the area of semiconductor nanomaterials, which represent extremely promising applications for materials with the spin-polarized transport of the charge carriers. It is shown on the basis of the last theoretical and experimental achievements that the development of diluted semic...
Article
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[P. Kervalishvili, Z. Gogua, L. Chkhartishvili. Novel approach to estimation of ground state energies of shallow and deep donors in tetrahedrally bonded semiconductors. Int. J. Nano Syst., 2008, 1, 1, 99-104.]: A unified model of the impurity center is suggested. Thereupon ground state energies of the substituent donor impurities in tetrahedrally c...
Article
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The development of semiconductive nanostructures for spinelectronics is discussed. Nanostructures constructed from inorganic solids such as semiconductors have new electronic and optical properties because of their size and quantization effects. The significance of spintronics is understood by perspectives of the development and creation of new typ...
Article
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A short overview is given of recent advances in the field of nanosemiconductors, which are suitable as materials for spin polarized transport of charge carriers. On the basis of last theoretical and experimental achievements it is shown that development of diluted and wide forbidden zone semiconductors with controlled disorders as well as their mol...
Article
Full-text available
A short overview is given of recent advances in the field of nano semiconductors, which are suitable as materials for spin polarized transport of charge carriers. On the basis of last theo- retical and experimental achievements, it is shown that development of diluted and wide forbidden zone semiconductors with controlled disorders as well as their...
Article
Full-text available
There is given a short overview of recent advances in the field of nanosemiconductors, which are suitable as materials for spin polarized transport of charge carriers. On the basis of latest theoretical and experimental advances, it is shown that the development of diluted and wide-gap semiconductors with controlled disorders as well as their molec...
Article
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. Boron carbide thin films have been produced by a method of laser plasma deposition. Depending on the experimental conditions, amorphous, polycrystalline and oriented films have been produced. The investigations of the composition and energy characteristics of the laser plasma have been carried out. The experiments showed that the plasma formed du...
Chapter
Distributed systems and networks of differentiated services are fair in the way that different types of traffic can be associated with different network services, and so with different quality levels. In the systematic development of distributed systems it is necessary to use the basic system models using the interface, distribution and state tran...
Article
Full-text available
Boron carbide thin films have been produced by a method of laserplasma deposition. Depending on the experimental conditions, amorphous, polycrystalline and oriented films have been produced. The investigations of the composition and energy characteristics of the laser plasma have been carried out. The experiments showed that the plasma formed durin...
Article
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The results of an investigation of amorphous and crystalline β-rhombohedral boron isotopic oxidation are presented. Boron-10 and boron-11 are different oxidation velocities dependent on the boron structure. This was established by comparative derivatographic investigations; the activation energies of oxidation were computed for each case. To explai...
Article
Investigations of defect production and annealing in moderately and heavily doped p-Si subjected to low-temperature electron irradiation at 2.5 MeV have been made. Removal rates of charge carriers were found to be about 2 cm-1 over the doping range studied. Recovery of the charge carrier concentration is not significant after annealing at room temp...
Article
The electron energy spectra of diborides of 3d-metals ScB2, TiB2, VB2, CrB2, and MnB2 are calculated ab initio. Thermodynamic properties and stability of these compounds are investigated at low temperatures. An analysis of the low-temperature heat capacity and magnetic properties of diborides has made it possible to establish a number of parameters...
Article
The electronic energy spectra were calculated ab initio for 3d-metal diborides: ScB2 , TiB2 , VB2 , CrB2 , and MnB2 . The thermodynamic properties and stability of these compounds are investigated in the low temperature region. The low temperature heat capacity and magnetic properties of the diborides were analysed which permitted us to find parame...
Article
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B 4 C in the form of thin films is of a special interest for design of neutron fluence probe. B 4 C films were produced by laser sputtering method and in this case, boron enriched in 10 B isotope up to 90% was used to increase 10 B (n, d) 7 L nuclear reaction cross section. B 4 C films were deposited on sapphire substrates. Depending on depositi...
Article
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Experimental results on the investigation of sensitive elements made of 10B-enriched boron carbide films and designed for neutron detection are described. The amorphous and crystalline films are deposited onto a heated sapphire substrate with a pulse-periodic laser. The samples are irradiated both by thermal and fast neutrons in a nuclear reactor....
Article
Full-text available
Boron and Boron carbide thin semiconductor films were produced by method for laser spraying. In the experiments, pulsed solid-state laser on an YAG:Nd crystal was used, the frequency of pulse following being 50 Hz. Depending on the experimental conditions, amorphous, polycrystalline and oriented films were produced on NaCl, silicon and saphire back...
Article
Some of the problems of hydrogen, nitrogen, and oxygen behavior in boron, which is a promising material for the development of sensitive elements in gas sensors of improved radiation resistance, were studied. Using gas and thermal gravimetric analysis methods the interaction of these gases with boron was investigated, and the influence of temperatu...
Article
Solid monocrystalline CdS films have been obtained by the method of hot walls on oxidized silicon substrates by graphoepitaxy. Morphological investigations of the initial stages of growth have been carried out with the help of a raster electron microscope. The structure of the grown film is studied by means of X-ray diffractometry, and its composit...
Article
Some peculiarities in the behaviour of hydrogen, nitrogen and oxygen impurities in ceramic samples of boron carbide and aluminium dodecaboride with semiconductor features have been studied. The relationship between the gas content in the items produced by hot compaction and sintering, and their density and thermal and electric conductivity is deter...
Article
The measurement errors of the neutron activation method can be reduced when one knows the precise number of nuclei of the target isotope and the length of the irradiation and when a well-founded technique of measuring the sample activity is available. One must also take into account self-shielding of the samples during their irradiation, with the s...
Article
The technique for thermal and epithermal neutron flux detection, as well as for slow neutron spectrum measuring, based on formation of silicon with electron conductivity by neutron transmutation doping, was developed. The method suggested is simple, gives the opportunity to work with almost nonradioactive specimens in wide temperature range, as wel...
Article
Full-text available
In this work we studied the possibility of producing thin epitaxial films from boron carbide using the method of laser spraying. (AIP)
Article
In this work we provide experimental results showing the possiblity of kinetic and thermodynamic evaluation of chemical activity of boron existence forms comparing heat capacity, determination of their arrangement according to the number of activities, as well as comparing activity of boron enriched with 10B and 11B isotopes (enriched 98.7 and 99.5...
Article
Full-text available
The study of IR MPD of HCIC =CBCI2H molecule by CO,.-laser is presented. We provide experimental results showing high degree of fragmentation of this molecule (down to elementary boron) during nonequilibrium laser induced radical bimolecular reactions. KEY WORDS: Multiphoton dissociation, CO2-1aser. HCIC CBCI_H molecules, nonequilibrium laser-chemi...
Article
Measurements for the absorption efficiency of the following cadmium-containing neutron absorber compositions are reported: CdO-ZrO/sub 2/, CdO-CaO, CdS-SiC, and CdS-B/sub 4/C. The efficiency of the materials in tablet form was measured with the uranium-graphite F-1 reactor and in the critical water-water Mayak assembly in the I.V. Kurchatov Institu...
Article
The results are presented of metallographic, x-ray phase, electron diffraction, and electron microscopic examination of the structure of specimens of large-block crystals of boron carbides produced by growing in the argon-arc plasma. Special attention is given to the effect of laser treatment on detection of structural imperfections and changes in...
Article
We describe the principle of neutron dosimetry using the (n, ..cap alpha..) conversion of the isotope ¹°B; the semiconductivity of amorphous and crystalline boron can be used to advantage in a wide energy range including both thermal and fast neutrons. In this case, the sensitive element of the instrument can be formed by an amorphous boron film...
Article
The authors report on the deposition (induced by radiation of a CO//2 laser) of boron particles from the gas phase of molecules of alkenes HClC equals CBCl//2H, and also on mass transfer of particles along the beam onto which the processes of isotopically selective multiphoton dissociation and secondary chemical reactions are superimposed. The latt...
Article
The method of high-resolution electron microscopy was used to examine the structure and constitution of boron films produced by laser-chemical reactions in the field of a pulsed CO//2 laser. The results show that the film represents the statistically distributed structural elements, i. e. , clusters of boron atoms with the icosahedral structure. It...
Article
The interaction of oxygen with powders of elementary crystalline boron of ..cap alpha.. and ..beta.. rhombohedral modifications was studied by the methods of differential-thermal analysis and thermogravimetric analysis in the temperature range 25-1000/sup 0/C.
Article
The results of analyzing the thermodynamic and mechanical equilibrium at the phase boundary of three phases show that the angles between the interfacial surfaces at the three-phase line are not thermodynamic constants of solidified matter. Since irreversible heat transfer must take place in the solid and liquid phases in solidification of the melt,...