Success Stories
08/02/2016 14:06

Shock Wave Dynamics in Neutral Gases and Plasma

The project N11/03: Shock Wave Dynamics in Neutral Gases and Plasma won in 2011 grant competition for fundamental research. The project supervisor is Iv. Javakhishvili Tbilisi State University Professor Sulkhan Nanobashvili. The goal of the project was to study in detail the shock wave (SW) evolution and dynamics in both – neutral medium and also plasma. Project tasks were divided in two parts: 1) shock wave evolution and dynamics in neutral gases and 2) shock wave evolution and dynamics in plasma . For accomplishment of project tasks there were created: 1) Universal Vacuum Device . In this device SW dynamics has been studied in neutral gases and also weakly ionized plasma in wide range of pressure. 2) Vacuum Device . In this device different radius ring shape SW multispark dischargers were installed. This way toroidal SW was formed and converging SW cumulation took place in the center of toroid. 3) CO 2 laser complex (main discharge modules, high voltage power supply together with its control panel and bank of capacitors, working gas – CO 2 , He and N - mixture preparation stand etc.) has been practically assembled anew, tested and tuned.           In project accomplishment period: 1) Joint research work has been continued on tokamak COMPASS (Institute of Plasma Physics, Czech Academy of Sciences, Prague, Czech Republic) in order to develop various ultrahigh frequency diagnostic devices, perform their testing and active experiments using these devices.  As a result of experiments the following has been found: 1) It is possible to obtain reliably spherical and plane SW by means of spark discharger in low pressure conditions down to p=3 Torr . 2) When gas pressure decreases shock wave amplitude decreases and Mach number increases. At low pressure p=3 Torr , Mach number reaches M=5.2 . 3) In pressure range p=1÷10 Torr plane shock wave velocity practically does not change at substantial distance (up to 30 cm) from the source. 4) Shock wave amplitude significantly decreases in plasma, while its velocity increases sharply increases by 35 %. 5) Increase of shock wave velocity in plasma takes place due to rise of temperature T=500÷600K (temperature is measured by thermocouple). 6) Decrease of shock wave amplitude in plasma is due to strong dissipation. It is also possible that this is connected also to so called isotope effect, which will be verified by forthcoming research. 7) By means of toroidal multispark discharger source unified SW is formed in reality. This SW propagates towards the center and strong cumulative effect takes place, which is accompanied by strong illumination in the central area and also ejection of strong jets perpendicular to the plane of toroid in both sirections. This effect is very similar to astrophysical jets, which gives motivation for continuation of research. 8) In the area of cumulation formation of Mach Wave is also observed. 9) In case of large diameter (d > 100 mm) multispark shock wave source use, close to the individual point of SW spark source SW front overcomes plasma and plasma does not participate in cumulative effects which take place in the central area. The results obtained in the framework of the project were presented on 4 international conferences and symposiums. They have been also published in scientific journals: 2012, “Toroidal Shock Wave Dynamics Near the Area of Cumulation” In Proc. 25 th Symposium on Plasma Physics and Technology SPPT 25 th , Prague, Czech Republic, June 18-21, 2012. S.Nanobashvili, G.Gelashvili, M.Mdivni-shvili, I.Nanobashvili,G.Rostomashvili 2012, „First Results from EBW Emission Diagnostics on COMPASS" Rev. Sci. Instrum., V.83, 10E327, 2012 AIP Publishing, USA J.Zajac, J.Preinhaelter, J.Urban, S.Nanobashvili, F.Zacek et al. 2013 „Modernization and calibration of interferometer of TOKAMAK Compass“ IEEE,2013,s.571-575. ISBN 978-1-4799-1066-3; IEEE Publishing, USA Varavin M., Zajac J., Žáček F., Nanobashvili S. et al . 2013, „Possible Use of Dynamic Ergodic Divertor as a Contactless Biasing in Tokamaks“ ECA, Vol. 37D, P5.171, 2013 European Physical Society Publishing, EU I.Nanobashvili 2014, “Shock Wave Propagation in Neutral Gases and Weakli ionized Plasma” In Proc. 25 th Symposium on Plasma Physics and Technology SPPT 26 th , Prague, Czech Republic, June 16-19, 2014, S.NanobaSvili, G.GelaSvili, M. MdivniSvili, I.Nanobashvili, G.Rostomashvili, G.Tavxelidze 2014, „New Design of Microwave Interferometer for Tokamak COMPASS“ Telecommunications and Radio Engineering,V.73, N 10, pgs. 935-942, 2014 This journ. consists of  transl. from two Russian journ.: Ele-ktrosvyaz' and Radiotekhnik. Publisher J.Wiley, USA  Varavin M., Zajac J., Žáček F., Nanobashvili S. et al . 2014, „Investigation of Intermittent Burst Characteristics for Bwttwr Understending of Plasma Turbulent Transport in Tokamaks“ Plasma Physics and Technology, V.1, № 1, p.26, 2014 Czech Technical University in Prague, Czech Republic I.Nanobashvili 2014, „Shock Wave Propagation in Neutral Gases and Weakly Ionized Plasma“ Plasma Physics and Technology, V.1, № 2, p.93, 2014 Czech Technical University in Prague, Czech Republic S.Nanobashvili, G.Gelashvili, M.Mdivnishvili,I.Nanobashvili, G. Rostomashvili, G.Tavkhelidze

2nd International School: Autumn Lectures in Tbilisi - Nuclear Physics in Medicine

15/01/2016 16:46
In 2015, a joint scientific and educational competition Foundation  Shota Rustaveli and Research Center Jülich in Germany, won the project N SS_15_2_002 entitled "2nd International School: Autumn Lectures in Tbilisi - Nuclear Physics in Medicine", led by Professor of the Georgian Technical University, Ketevan Kotetishvili. On October 4-14, at GTU Department of Physics organized “Autumn Lectures in Tbilisi-2”, within the scope of agreement signed between GTU and Julich Scientific-Research Center (Germany).  The lectures and practical works within “Autumn Lectures in Tbilisi-2” covered Nuclear Physics and Medical Physics The lectures were delivered by Professors of Cologne, Aachen and Bonn Universities (Germany), including Director of Julich Scientific-Research Center, Prof. Sebastian Shmidt, Director of Institute  Nuclear Physics  (IKP) Prof. Hans Stroeher, Director of Institute Neuroscience and Medicine  (INM) ,Prof. Nadim Jon Shah, Director Central Institute for Engineering, Electronics and Analytics (ZEA) Prof.Ghaleb Natour, Prof. Detlev Gotta (IKP). DR.Andro Kacharava  (IKP) Dr.Irakli Keshelashvili (IKP), Prof.Farida Grinberg (INM),Dr. Jorg Wolters (ZEA), Prof. Diter Evershei  (Bonn University). The representatives of  the target groups are PhD students, Masters students, Bachelors  and high achievers school groups who were interested in nuclear physics and medical physics issues. Lectures consist of theoretical and practical exercises it. The importance was drawn towards the usage of nuclear  physics in medicine  and on the recent research made in Julich Scientific-Research Center . Six students were selected for the participation in the internship programme in Julich Scientific-Research Center ,this will encourage the integration of Georgian students into the international science research centers.  

All optical amplifying and coding devices with combined waveguides

15/01/2016 16:05
Research Project No AR-30/12: “All optical amplifying and coding devices with combined waveguides” has been selected in 2012 applied research grant competition. Project manager – Associate Professor from Ivane Javakhishvili Tbilisi State University – Ramaz Khomeriki The ultimate goal of the project was an investigatin of amplification possibility of optical signals in combined metal-dielectric subwavelength waveguides in case of side illumination of the waveguide. Under such condition it is possible to introduce a nontrivial boundary condition inducing signal amplification in the carrying waveguide. Thus by implementation of this project it has been made possible to suggest all optical transistor and diode devices based solely on linear effects. Schematic presentation of such a setup is presented in the figure below. According to project manager information, it is shown that negative refraction effect could be realized for solitonic waves in nonlinear periodic dielectrics. By this it is possible to achieve aberration free focusing under realistic experimental conditions. Project Results: The main achievement of the project is a suggestion of all optical linear amplification mechanism. Besides that the results could be generalized for completely different physical contexts, particularly, photonic amplification scheme is similar to “atomic chip” development studies, since light propagation in photonic crystals has a same mechanism as a dynamics of cold atoms in optical lattices. In the figures below we present the simulations of analogous amplification of optical signals in photonic crystals. The results obtained under the funding has been reported at international conferences and published in high impact factor journals:     All-optical amplification in metallic subwavelength linear waveguides 2013, Phys. Rev. A, 87, 053806 APS Ramaz Khomeriki, Jérôme Leon Dynamics of Localized Modes in a Composite Multiferroic Chain 2013, Phys. Rev. Lett. 111, 117202 APS L. Chotorlishvili, R. Khomeriki, A. Sukhov, S. Ruffo, J. Berakdar Dipolar needles in the microcanonical ensemble: Evidence of spontaneous magnetization and ergodicity breaking 2013, Europhys. Lett., 104, 17011 EPS G. Miloshevich, Th. Dauxois, R. Khomeriki, S. Ruffo Creation and amplification of electromagnon solitons by electric field in nanostructured multiferroics 2015, Phys. Rev. B. 91, 041408(R) APS R. Khomeriki, L. Chotorlishvili, B. Malomed, J. Berakdar Landau–Zener tunneling in multiferroic composites 2015, New Journal of Physics, 17, 013030 APS R. Khomeriki, L. Chotorlishvili, J. Berakdar Linear Amplification of Optical Signal in Coupled Photonic Crystal Waveguides 2015, Photonics Technology Letters, IEEE, 27, 639 IEEE V. Jandieri, R. Khomeriki Instabilities and relaxation to equilibrium in long-range oscillator chains 2015, Phys. Rev. E 91, 032927 APS G. Miloshevich, J.P. Nguenang, Th. Dauxois, R. Khomeriki, S. Ruffo

Simplicial Algebra, Homology Theories, K-theory and Applications for Algebraic and Topological Structures

15/01/2016 13:33
The project entitled “Simplicial Algebra, Homology Theories, K-theory and Applications for Algebraic and Topological Structures” (ref. number DI/12/5-103/11) under the leadership of Alexander Chigogidze, dean of Science and Technology of the College of Staten Island of the City University of New-York, won 2011 year Open Call “Joint research activities with foreign scientists originated from Georgia”. The project was focused on issues relevant to modern algebra and algebraic topology. Similar themes are investigated in all the major mathematical centers over the world. The scientific results obtained, during the project, are important for the development of appropriate field in Georgia and in general as well.    Four Georgian students were involved in research activity of the project, who gained valuable scientific experience  for the project time. Now all of them continue their studies under the Georgian - German joint doctoral program at Goettingen University (G.Nadareishvili, A.Tavkhelidze  -  Cosupervisors: Professors H.Inassaridze and R.Mayer; G.Arabidze, I.Nanobashvili  -  Cosupervisors: Professors N.Inassaridze, R.Mayer and Chen chang Zhu).   One of the main values of the project  consists in supporting by the project team the scientific development of non-abelian, equivariant homological and homotopical algebra, cyclic and Hochschild homologies, K-theory and category theory by presenting important scientific results.   Another significant value of the realized project is to further strengthen the scientific society of mathematicians in Georgia, to intensify their professional international contacts, by the means of joint research and also new opportunities of European education for students.   Within the project, 12 scientific articles have been published in peer - reviewed international highly - rated mathematical journals.

15/01/2016 12:24
15/01/2016 12:23

Developmentof Technologies of New Generation Diabetic Foods

According to the results of 2012 research grant competition, there was granted the Project N AR - 30/25 “ Developmentof Technologies of New Generation Diabetic Foods ” headed by Manana Karchava, Professor of the Akaki Tsereteli State University. The goal of the research project was to develop technologies for manufacturing new-generation diabetic products, which not only would protect the body from excess carbohydrates, but they would be also able to activate the body’s protective physiological mechanism, improve immunity, normalize the overall condition of the body, and, as a consequence, to increase the quality of life of people with diabetes.  Result / Product :  There have been developed technologies for manufacturing of crucially new for consumer market diabetic confectionery products with high nutritive value as follows: diabetic wheat and fruit (apple, quince, feijoa, citrus) crackers, diabetic ship biscuits, diabetic fruit cakes, traditional Easter cakes, spice-cakes, almond biscuits, nut cookies, walnut biscuits, cheesecakes and tarts, diabetic sour cream tarts, diabetic walnut tarts and pastry; tarts and pastry with fruit powder, lenten tarts and pastry. There have been developed technologies for manufacturing of diabetic non-alcoholic beverages based on Georgian mineral waters. With support from Science Foundation, within the project GNSF/ST 07/7 – 256 “ Diabetic bread and other products processing  Technologie” ), there have been also developed technologies for manufacturing of diabetic bread (protein- and fiber-enriched bread, vitamins bread, iodinated bread; low-caloric lavashi), floury precooked goods (diabetic khachapuri, pizza and khinkali), diabetic bread roll and diabetic macaroni.    Novelty of technologies is proved by Georgian patents as follows: Diabetic protein- and fiber-enriched bread  (Patent   P  4168) Diabetic vitamins bread (Patent   P 5614) Diabetic iodinated bread (Patent   P 5631) Diabetic low-caloric lavashi  (Patent   P 5834) Diabetic khachapuri (Patent   P 5835) Diabetic bread roll (Patent   P 5836) Diabetic pizza (Patent   P 5837) Diabetic khinkali (Patent   P 5263) Diabetic macaroni (Patent   P 5264) There have been prepared the applications for utility patents on the following technologies: Method for producing diabetic pastry  (Application   №13501/01) Composition of ingredients for diabetic crackers  (Application    №13647/01) Composition of ingredients for  diabetic beverages with high biological value  (Application    №13696/01) New technologies have been developed for providing a low glycemic and inulinic indexes and high nutrition value of the developed products.    A low glycemic index has been achieved in the following products: in baked products by increasing the content of crude gluten and by using low-glycemic and low-insulinic (nontraditional for bakery and flour confectionery goods) plant raw materials with low content of starch.    To provide high nutrition value of diabetic products, there have been used in these technologies the natural protein- and fiber-enriched, vitamins, antioxidant supplements rich with biologically active substances, berries, medicinal plants and Georgian mineral waters. All the developed products have passed clinical trials in the V. Iverieli Endocrinology-Metabology-Dietology Center of Georgia and at the Kutaisi Church Hospital’s St. David the Bulder Xenon. On the basis of carried out clinical trials, the low glycemicity of new products has been proved (a glycemic index lower than 45 units), and the recommendations for introducing in nutrition of patients with diabetes (type 2).     All the products produced by using new technologies have passed manufacturing testing at the Kutaisi Multi-Profile Food Enterprise “Gurmani” Ltd. (manufacturer-company). There have been drawn up the reports on manufacturing testing and approved the temporary technological guidelines. The resultant product is not only of diabetic purpose, but it is of dietary purpose as well for people suffering from excess weight, dyslipidemias and metabolic syndrome, and what is no less important – it is a healthy diet food for any healthy person.    Presentation  

15/01/2016 12:22
15/01/2016 12:08

On asymptotic behavior of solutions of functional-differential and discrete equations

15/01/2016 11:54
The project N 31/09 “On asymptotic behavior of solutions of functional-differential and discrete equations” by the professor of Iv. Javakhishvili Tbilisi State University Roman Koplatadze won the 2012 year competitions in fundamental grant. The purpose of the grant was to create the new study methods for asymptotic behavior of solutions of differential  and discrete equations. The new results was found about existing of  vanished, oscillated, and unbounded solutions of functional differential  equations. It was investigated essential nonlinear and almost linear differential equations, generalized of Emden-Fowler nonlinear and linear differential  equations. This type of equations were learned as first time.  Furthermore, problems about oscillation of solutions of discrete equations were learned, where optimal results are obtained. These results are the generalize of the before well known results, which were published in 5 international (Impact Factor) and 3 reviewed scientific journals. "On asymptotic behavior of solutions of generalized Enmden-Fowler differential equations with delay argument". 2014, Art. ID 168425, 13pp. Abstract and Applied Analysis Hindawi Publishing Corporation, R. Koplatadze, A. Domoshnitski. " Oscillation criteria for first order linear difference equations with several delay arguments”. 17 (2014), no. 2, 248-267. Nonlinear Oscillations, Springer, R. Koplatadze, S. pinelas. "Oscillation criteria for differential equations with several non-monotone arguments”. 53 (2015), no. 3, 14pp. Funkcialaj Ekvacioj Japan Publications Trading Go. Ltd. R. Koplaradze, J. Infante, I. Stavroulakis. "The specific properties of solutions of first order differential equations with several delay arguments”. 50 (2015), no. 5, 229-235. Journal of Contemporary Mathematical  Analysis Springer, .R. Koplatadze. "On higner order generalized Emden-Fowler differential equations with delay arguments". 18 (2015), no. 4, 507-526. Nonlinear Oscillations, Springer, R. Koplatadze, A. Domoshnitski. ”On oscillatory properties of solutions of n-th order generalized Emden-Fowler differential equations with delay argument”. 40 (2014), 32-38, Reports of Seminar of I. Vekua Institute of Applied Mathematics R. Koplatadze. ”Oscillation criteria for difference equations with severaldelay arguments”. 40 (2014), 28-31, Reports of Seminar of I. Vekua Institute of Applied Mathematics, R. Koplatadze. ”Oscillation criteria for differential and discrete equations with several delays”. 18 (2014), 3-10, Bulletin of TICMI, R. koplatadze.
15/01/2016 11:11