Impact of resistive MHD plasma response on perturbation field sidebands

Orlov, D M,Evans, T E,Moyer, R A,Lyons, B C,Ferraro, N M,Park, G-Y IOP 2016 Plasma physics and controlled fusion Vol.58 No.7

<P>Single fluid linear simulations of a KSTAR RMP ELM suppressed discharge with the M3D-C<SUP>1</SUP> resistive magnetohydrodynamic code have been performed for the first time. The simulations show that the application of the <I>n</I>  =  1 perturbation using the KSTAR in-vessel control coils (IVCC), which apply modest levels of <I>n</I>  =  3 sidebands (~20% of the <I>n</I>  =  1), leads to levels of <I>n</I>  =  3 sideband that are comparable to the <I>n</I>  =  1 when plasma response is included. This is due to the reduced level of screening of the rational-surface-resonant <I>n</I>  =  3 component relative to the rational-surface-resonant <I>n</I>  =  1 component. The <I>n</I>  =  3 sidebands could play a similar role in ELM suppression on KSTAR as the toroidal sidebands (<I>n</I>  =  1, 2, 4) in DIII-D <I>n</I>  =  3 ELM suppression with missing I-coil segments (Paz Soldan <I>et al</I> 2014 <I>Nucl. Fusion</I> <B>54</B> 073013). This result may help to explain the uniqueness of ELM suppression with <I>n</I>  =  1 perturbations in KSTAR since the effective perturbation is a mixed <I>n</I>  =  1/<I>n</I>  =  3 perturbation similar to <I>n</I>  =  3 ELM suppression in DIII-D.</P>

Stochastic Modelling of Thermokarst Hazard for Gas Pipelines in Uniform Geological Conditions

( Timofey Orlov ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2

The aim of this work is to improve stochastic model of thermokarst depressions appearing and expanding along the gas pipeline on the icy ground. We assume that thermokarst depressions are constantly appearing (i.e. asynchronous start). This stochastic process is running independently for the non-crossing strips during non-crossing periods. So, we can find an equation of the probability of the depressions to appear within a sample strip which depends exclusively on the strip length and time. The main results of this model are: density of lake location should fit Poison distribution and thus the distance between lakes projections to the road should fit exponential distribution. This means that depression appearances are independent events. We used modern high resolution images captured at 1960-2012-2017 years with resolution 0,3-0,7-2 m/pix (Corona, Digital Globe by DigitalGlobe Foundation). There were found 587 newly appeared depressions at the 9 km length pipeline. For newly appeared lakes in homogenous environment the distance between projections of lakes centers to the pipeline fits exponential distribution. It means that lakes location along the road fits Poisson distribution. Projections to the road and to the perpendicular have lognormal distribution. The ratio between these projections fits lognormal distribution. The approach can be implement to the prediction of lake appearance and thermokarst hazard forecast for the unsealed roads in similar environment. The research is done with the support of Russian Geographic Society and Russian Foundation for Basic Research Grant # 17-05-41141.

Assessment of the Probability of Hazardous Process Development for Linear Structures Crossing Peatlands from a Single Time Slice Using Neural Network

( Timofey Orlov ),( Victor Smagin ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2

Peatlands are widespread all over Russia. Linear structures often are being designed and built across them. This work aims to develop a probability assessment technique for hazardous processes developing along with the linear structures. The technique results from the idea of the different probability of hazardous processes depending on the thickness and composition of the peat layer. There are critical thicknesses according to building standard, such as up to 1 m, from 1 to 3 m, more than 3 m. Accordingly, it is important at the first stage to develop a technique which allows us to detect the peat thickness quickly and reliably. In this work, we use a set of actual methods using quantitative parameters of landscape changes for developing landscape metrics, ground-penetrating radar (GPR) profiling, and convolutional neural networks. The analysis reviled that the following set of spatial data is the best for the peat thickness detecting: - Interpretation results of the PCA for the whole set of the optic channels of Sentinel 2. - Boundaries of main bog micro-landscapes. - Peatland topography. - The distance from a zero mark of peat depth. After extrapolation, we have got a peat thickness assessment for the total area under investigation (444 sq.km). The extrapolation error was evaluated using the test data as 18% (percentage of wrong predicted parameters of the testing sample). Now we plan to try to decrease the obtained error. The research was done with the support of the Russian Foundation for Basic Research projects 17-04-01749 and 18-05-00723.

Deep-sea fisheries: yesterday, today, and tomorrow

Alexei M. Orlov 한국수산해양기술학회(구 한국어업기술학회) 2018 한국수산해양기술학회 학술발표대회 Vol.2018 No.11

Russia`s Policy Perspective toward the Korean Peninsula: Security Aspect

( Vladimir A. Orlov ) 국방대학교 안보문제연구소 2000 The Korean Journal of Security Affairs Vol.5 No.2

Capital-Labor Caomplementarities In R &D Production and the Lingering Effects of Economic Slowdowns

ALEXEI G. ORLOV;JOHN ROUFAGALAS 경제연구소 2008 Journal of Economic Development Vol.33 No.1

In an attempt to advance our understanding of the potential long-run benefits of macroeconomic stabilization policies, the paper studies the long-term effects of economic slowdowns. We construct a discrete-time endogenous growth model, in which a recession, defined as a reduction in resource utilization for a limited number of periods, may have long-lasting detrimental effects on the growth path of the economy. We study the long-term consequences of recessions of various durations and intensities by comparing an economy that grows at steady state rates to one that experiences a recession. The long-run effects of a recession are estimated as the discounted present value of the output differences of the two economies. Our results show that even mild recessions, such as those observed in the last 50 years in the U.S., can have long-lasting adverse level effects on output. A typical recession that causes a 1% reduction in GDP for one year, after which the economy returns to its steady-state 3% growth rate, may result in output losses whose present value is equivalent to 6.5% of the pre-recession output.

Capital-Labor Complementarities in R&D Production and The Lingering Effects of Economic Slowdonws

Alexei G. Orlov,John Roufagalas 중앙대학교 경제연구소 2008 Journal of Economic Development Vol.33 No.1

In an attempt to advance our understanding of the potential long-run benefits of macroeconomic stabilization policies, the paper studies the long-term effects of economic slowdowns. We construct a discrete-time endogenous growth model, in which a recession, defined as a reduction in resource utilization for a limited number of periods, may have long-lasting detrimental effects on the growth path of the economy. We study the long-term consequences of recessions of various durations and intensities by comparing an economy that grows at steady state rates to one that experiences a recession. The long-run effects of a recession are estimated as the discounted present value of the output differences of the two economies. Our results show that even mild recessions, such as those observed in the last 50 years in the U.S., can have long-lasting adverse level effects on output. A typical recession that causes a 1% reduction in GDP for one year, after which the economy returns to its steady-state 3% growth rate, may result in output losses whose present value is equivalent to 6.5% of the pre-recession output.

Recombination and optical properties of dislocations gliding at room temperature in GaN under applied stress

Vergeles, P.S.,Orlov, V.I.,Polyakov, A.Y.,Yakimov, E.B.,Kim, Taehwan,Lee, In-Hwan Elsevier 2019 Journal of Alloys and Compounds Vol.776 No.-

<P><B>Abstract</B></P> <P>The recombination and optical properties of dislocations in GaN introduced at room temperature by applied stress have been studied. It is observed that under the application of local shear stress of a few tens of MPa the dislocation glide in the parallel to the surface basal planes and in the planes intersecting the surface is activated at room temperature. It is shown that dislocations of dislocation half-loops gliding in the planes intersecting the surface can demonstrate both radiative and nonradiative recombination. Basal plane dislocations are shown to increase the nonradiative recombination rate. It is observed that the low-energy electron beam irradiation stimulates the dislocation glide both in the basal plane and the planes inclined to the surface, this effect being weaker for the basal plane. The analysis of electron irradiation effect on the dislocation related cathodoluminescence band suggests that this band is due to recombination involving complexes of point defects. These complexes are believed to be generated by gliding of the dislocation segments emerging at the surface.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Recombination properties of dislocations in GaN after a Vickers indentation are studied. </LI> <LI> Dislocation glide in the basal plane and planes inclined to the surface is activated at room temperatures. </LI> <LI> Dislocation half-loops gliding in the planes inclined to the surface demonstrate radiative recombination of charge carriers. </LI> <LI> Low-energy electron beam irradiation stimulates the dislocation glides. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Nickel phosphate molecular sieves VSB-5 as heterogeneous catalysts for synthesis of monosaccharides from formaldehyde and dihydroxyacetone

Delidovich, Irina V.,Timofeeva, Maria N.,Orlov, Alexander Yu.,Panchenko, Valentina N.,Hasan, Zubair,Jhung, Sung Hwa,Taran, Oxana P.,Parmon, Valentin N. The Royal Society of Chemistry 2012 NEW JOURNAL OF CHEMISTRY Vol.36 No.11

<P>Condensation of dihydroxyacetone with formaldehyde was found to be effectively catalyzed by nickel phosphate molecular sieves (VSB-5 and Fe–VSB-5) in neutral aqueous medium. In the presence of VSB-5 the main products are erythrulose and 3-pentulose, while Fe–VSB-5 favours the formation of only erythrulose.</P> <P>Graphic Abstract</P><P>Condensation of dihydroxyacetone with formaldehyde was found to be effectively catalyzed by nickel phosphate molecular sieves (VSB-5 and Fe–VSB-5) in neutral aqueous medium. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2nj40363c'> </P>

Requirements on a computer bank of knowledge

Alexander S. Kleschev,Vasiliy A. Orlov 한국지능정보시스템학회 2001 한국지능정보시스템학회 기타 간행물 Vol.- No.-