检索结果-南通市图书馆

Management of Control Impacts Based on Maximizing the Spread of Influence

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2019年第3期16卷 341-353页

作者： Alexander Tselykh vladislav Vasilev Larisa Tselykh Institute of Computer Technologies and Information Safety Southern Federal University.Rostov-on-Don 344006.Russia Department of Economics and Business Rostov State University of EconomicsRostov-on-Don 344002.Russia

The choice of fulcrums for control of socio-economic systems represented by direc ted weighted signed graphs is a topic of current *** article proposes a new method for identifying nodes of impact and influential nodes,which will provide a guaranteed positive system response over the growth *** task is posed as an optimization problem to maximize the ratio of the norms of the accumulated increments of the growth vector and the exogenous impact *** algorithm is reduced to solving a quadratic programming problem with nonlinear *** selection of the most effective vertices is based on the cumulative gains of the component projections onto the solution *** examples arc provided to illustrate the effectiveness of the proposed method.

关键词： Directed weighted graphs control impact spread of influence optimization algorithm growth model

Optimizing signal collection efficiency of the VIPA-based Brillouin spectrometer

在线全文

学校读者我要写书评

暂无评论

Journal of Innovative Optical Health Sciences 2015年第4期8卷 39-45页

作者： Zhaokai Meng vladislav V.Yakovlev Texas A&M University College StationTX 77843USA

Brillouin spectroscopy is an emerging tool for microscopic optical imaging as it allows for non-invasive and direct assessment of the viscoelastic properties of *** advances of background-free confocal Brillouin spectrometer allows investigators to acquire the Brillouin spectra for turbid samples as well as transparent ***,due to strong signal loss induced by the imperfect optical setup,the Brillouin photons are usually immersed in background *** this report,we proposed and experimentally demonstrated multiple approaches to enhance the signal collction eficiency.A signal enhancement by>4 times can be observed,enabling ob-servation of ultra-weak signals.

关键词： Brillouin spectroscopy confocal microscope microscopic mechanical property specific imaging

Unraveling effects of electron correlation in two-dimensional Fe_(n)GeTe_(2)(n=3,4,5)by dynamical mean field theory

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2023年第1期9卷 1453-1468页

作者： Sukanya Ghosh Soheil Ershadrad vladislav Borisov Biplab Sanyal Department of Physics and Astronomy Uppsala UniversityBox-51675120 UppsalaSweden

The Fe_(n)GeTe_(2) systems are recently discovered two-dimensional van-der-Waals materials,exhibiting magnetism at room *** sub-systems belonging to Fe_(n)GeTe_(2) class are special because they show site-dependent magnetic *** focus on the critical evaluation of magnetic properties and electron correlation effects in Fe_(n)GeTe_(2)(n=3,4,5)(FGT)systems performing first-principles *** different ab initio approaches have been used primarily,viz.,(i)standard density functional theory(GGA),(ii)incorporating static electron correlation(GGA+U)and(iii)inclusion of dynamic electron correlation effect(GGA+DMFT).Our results show that GGA+DMFT is the more accurate technique to correctly reproduce the magnetic interactions,experimentally observed transition temperatures and electronic *** inaccurate values of magnetic moments,exchange interactions obtained from GGA+U make this method inapplicable for the FGT *** determination of magnetic properties for this class of materials is important since they are promising candidates for spin transport and spintronic applications at room temperature.

关键词： temperature theory dimensional

Microfracture Characterization in Sandstone Reservoirs:A Case Study from the Upper Triassic of Syria's Euphrates Graben

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Earth Science 2022年第4期33卷 901-915页

作者： Ibrahem Yousef Vladimir Morozov vladislav Sudakov Ilyas Idrisov Institute of Geology and Petroleum Technologies Kazan Federal UniversityKazan 420111Russia

The Euphrates Graben is located in eastern *** Upper Triassic Mulussa F Formation sandstones serve as the primary reservoir intervals in the majority of the graben *** study’s findings were based on core studies:petrographic examination of thin sections,scanning electron microscope(SEM),imaging of backscatter scanning electron microscope(BSE),X-ray microprobe examinations,and carbon-oxygen stable isotope analysis of microfracture-filling *** of the most common types of microfracture found in the investigated sandstones are intragranular or intracrystalline microfractures,grain boundary or grain-edge microfractures,and transgranular(crossing grains)*** microfractures that are open and free of secondary mineralization improve sandstone storage and ***,microfractures that are cemented and filled with secondary mineralization reduce storage and *** siderite and pyrite cements were identified within the microfractures and the nearby sandstone *** anhedral or euhedral siderites are thought to form during shallow burial diagenesis,whereas poikilotopic siderites are thought to form during deep burial *** pyrite is believed to be a diagenetic cement,which is attributed to the reduction of iron oxides present in the sediments in the presence of *** reflect tectonic,overpressure,and diagenetic *** of tectonic origin are associated with folding and thrust activities over the Euphrates Graben area,and they were formed at the beginning of the Upper Triassic with siderite and pyrite cement equilibration temperatures of approximately 100–105℃,and they continued forming from the middle to the end of the Upper Triassic with cement equilibration temperatures of approximately 90–100℃in conjunction with the first phase of the Euphrates *** related to diagenetic and overpressure processes are tension microfractures and wer

关键词： microfracture sandstone Upper Triassic Mulussa F Euphrates Graben Syria

Cementation Characteristics and Their Effect on Quality of the Upper Triassic, the Lower Cretaceous, and the Upper Cretaceous Sandstone Reservoirs, Euphrates Graben, Syria

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2021年第6期32卷 1545-1562页

作者： Ibrahem Yousef Vladimir Morozov vladislav Sudakov Ilyas Idrisov Institute of Geology and Petroleum Technologies Kazan Federal UniversityKazanRussia

This article presents the results of cementation characteristics and their effect on sandstone reservoir quality of the Upper Triassic Mulussa F, the Lower Cretaceous Lower Rutbah, and the Upper Cretaceous Post Judea Sandstone formations in selected fields in the Euphrates Graben area, Syria. This study emphasises the role of cementation in the evaluation of the diagenetic history of the sediments, developing effective porosity, as well as evaluation of reservoirs stimulation procedures and potential for formation damage of the sandstone reservoirs. Quartz cement is present as well developed tabular or pyramidal syntaxial overgrowths. Kaolinite cement is present as vermicular aggregates which are most abundant within sandstones of the Mulussa F Formation. Carbonate cements include siderite and dolomite. Four lithofacies were identified within the studied formations;lithofacies-1 and 2 correspond to fluvial depositional environments, lithofacies-3 and 4 correspond to fluvial to estuarine channel environments. The Post Judea Sandstone and the Lower Rutbah reservoir units are typically lithofacies-3 sequences in which quartz overgrowths are the dominant cement. Because the total cement is more extensive in the Post Judea Sandstone Formation than in the Lower Rutbah Formation, resulting in high porosity(up to 26%) and permeability(6 000 mD), the reservoir quality is predicted to be best in the Post Judea Sandstone Formation. The reservoir units in the Mulussa F Formation contain the highest cement volumes comprised of early siderite and kaolinite, which, with the development of compaction-resisting quartz overgrowths and resultant compactional pore volume loss, has resulted in typically lower porosity being preserved than in the Lower Rutbah and Post Judea Sandstone formations.

关键词： cementation diagenesis reservoirs quality Euphrates Graben Syria

A pilot study of the dynamics of tissue oxygenation in vivo using time-resolved phosphorescence imaging

在线全文

学校读者我要写书评

暂无评论

Journal of Innovative Optical Health Sciences 2021年第5期4卷 15-24页

作者： Natalia Kazachkina Julia Lymar vladislav Shcheslavskiy Alexander Savitsky A.N.Bach Institute of Biochemistry Research Center of Biotechnology of the Russian Academy of Sciences Moscow 119071Russian Federation Institute of Experimental Oncology and Biomedical Technologies Privolzhsky Research Medical University Sq Minin and Pozharsky10/1603005 Nizhny Novgorod Russian Federation Becker and Hickl GmbH Nunsdorfer Ring 7-912277 BerlinGermany

Oxygenation of tissues plays an important role in the development and progression of tumor to treatment *** of metalloporphyrines phosphorescence quenching by oxygen is one of the ways to measure dynamics of the oxygen concentration in the tissues by phosphorescence lifetime imaging of meso-tetra(sulfophenyl)tetrabenzoporphyrin Pd(Ⅱ)(TBP)using the time-correlated single photon counting(TCSPC)*** has been shown that phosphorescence lifetime of the sensor in S37 tumor in vivo varied in the range of 130 to 290μs after both topical and intravenous administration of *** indicates that oxygen level in tumors was lower compared to normal tissues where TBP phosphorescence has not been *** lifetimes of TBP increased in the solid tumor and in the muscle after photodynamic therapy of solid tumor that demonstrates oxygen consumption during treatment and possibly stopping the blood flow and hence the oxygen supply to the tissues.

关键词： Phosphorescence oxygen sensor metalloporphyrines TCSPC

Crystals based on solid solution of Ag_(1-x) Tl_xBr_(1-x) I_x for the manufacturing of IR fibers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Optics Letters 2015年第9期13卷 6-8页

作者： Alexandr Korsakov Liya Zhukova Dmitrii Salimgareev vladislav Zhukov Ural Federal University named after the first President of Russia

For the development of fiber optics for the range from 0.2 to 50.0 μm, one needs light-stable, nonhygroscopic, ductile crystals that would be transparent within this spectral range and have a lack of cleavage, and from which the flexible infrared （IR） fibers are extruded. The crystals based on solid solutions of silver and monadic thallium haides meet the conditions listed above. Consequently, by differential thermal and x ray analyses, we study the TIBr-TII phase diagram using the crystals with optimal compositions, which we grow ourselves. We also manu- facture light-stable nanocrystalline IR fibers that are transparent at longer wavelengths compared with AgC1-AgBr fibers.

关键词： I_x for the manufacturing of IR fibers Crystals based on solid solution of Ag IR

Evaluation of SiC-porcelain ceramics as the material for monolithic catalyst supports

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2014年第3期3卷 230-239页

作者： Oleg SMORYGO Alexander MARUKOVICH Vitali MIKUTSKI vladislav SADYKOV Powder Metallurgy Institute 41Platonov Str.220005MinskBelarus Boreskov Institute of Catalysis 5Lavrentiev Ave.630090NovosibirskRussia

Mechanical and thermal properties of SiC-porcelain ceramics were studied in the wide SiC content range of 0-95%.Microstructure evolution,shrinkage at sintering,porosity,mechanical strength,elastic modulus,coefficient of thermal expansion(CTE)and thermal conductivity were studied depending on SiC *** optimal sintering temperature was 1200℃,and the maximum mechanical strength corresponded to SiC content of 90%.Parametric evaluation of the ceramic thermal shock resistance revealed its great potential for thermal cycling *** was demonstrated that the open-cell foam catalyst supports can be manufactured from SiC-porcelain ceramics by the polyurethane foam replication process.

关键词： SiC porcelain mechanical properties thermal properties foam

Adaptive Algorithm for Accelerating Direct Isosurface Rendering on GPU

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2018年第3期16卷 222-231页

作者： Sergey Belyaev Pavel Smirnov vladislav Shubnikov Natalia Smirnova the Department of Applied Mathematics Institute of Applied Mathematics and MechanicsPeter the Great St.Petersburg Polytechnic UniversitySt.Petersburg 195251 EPAM Systems Inc. Newtown PA 18940

Direct isosurface volume rendering is the most prominent modern method for medical data *** is based on finding intersection points between the rays corresponding to pixels on the screen and isosurface. This article describes a two-pass algorithm for accelerating the method on the graphic processing unit(GPU). On the first pass, the intersections with the isosurface are found only for a small number of rays, which is done by rendering into a lower-resolution texture. On the second pass, the obtained information is used to efficiently calculate the intersection points of all the other. The number of rays to use during the first pass is determined by using an adaptive algorithm, which runs on the central processing unit(CPU) in parallel with the second pass of the rendering. The proposed approach allows to significantly speed up isosurface visualization without quality loss. Experiments show acceleration up to 10 times in comparison with a common ray casting method implemented on GPU. To the authors’ knowledge, this is the fastest approach for ray casting which does not require any preprocessing and could be run on common GPUs.

关键词： Adaptive algorithms isosurface rendering ray casting volume visualization