检索结果-南通市图书馆

Worlds and Antiworlds

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 Modern Physics 2014年第15期5卷 1537-1545页

作者： Alexey v. Klimenko vladimir A. Klimenko Physics Department Chelyabinsk State University Chelyabinsk Russia

In the framework of the theory of the gravitational field, which distinguishes between particles and antiparticles, it is shown that even in the Early Universe its disintegration occurred into areas consisting of baryons (worlds), and areas consisting of antibaryons (antiworlds). It is hypothesized that astronomers have observed worlds and antiworlds for fifteen years. They are, according to the authors, objects that can be seen as relatively bright spots against the almost uniform background of cosmic microwave radiation, having a characteristic angular size of quarter degree.

关键词： Cosmology Particles Antiparticles Worlds Antiworlds Gravitational Field

Deep‐learning powered whispering gallery mode sensor based on multiplexed imaging at fixed frequency

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Opto-Electronic Advances 2020年第11期3卷 1-9页

作者： Anton v.Saetchnikov Elina A.Tcherniavskaia vladimir A.Saetchnikov Andreas Ostendorf Applied Laser Technologies Ruhr University BochumBochum 44801Germany Radio Physics Department Belarusian State UniversityMinsk 220064Belarus Physics Department Belarusian State UniversityMinsk 220030Belarus

During the last decades the whispering gallery mode based sensors have become a prominent solution for label-free sensing of various physical and chemical *** the same time,the widespread utilization of the approach is hindered by the restricted applicability of the known configurations for ambient variations quantification outside the laboratory conditions and their low affordability,where necessity on the spectrally-resolved data collection is among the main limiting *** this paper we demonstrate the first realization of an affordable whispering gallery mode sensor powered by deep learning and multi-resonator imaging at a fixed *** has been shown that the approach enables refractive index unit(RIU)prediction with an absolute error at 3×10^(-6) level for dynamic range of the RIU variations from 0 to 2×10^(-3) with temporal resolution of several milliseconds and instrument-driven detection limit of 3×10−*** sensing accuracy together with instrumental affordability and production simplicity places the reported detector among the most cost-effective realizations of the whispering gallery mode *** proposed solution is expected to have a great impact on the shift of the whole sensing paradigm away from the model-based and to the flexible self-learning solutions.

关键词： optical microresonator sensing machine learning whispering gallery mode multiplexing

Physics Base &Conceptual views Complex of Ball Lightning

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Physics 2010年第4期1卷 251-275页

作者： Anton v. Pinchuk vladimir A. Pinchuk 不详

The complex of conceptual views about ball lightning (BL) as containing surplus electrical charge quasi- stationary material foundation with distinctions between levels of translation temperature and exciting tem- peratures of chemical bonds and electron energy states has been offered and is substantiated in the paper. The being formed complex is grounded upon overstepping the limits of generally accepted physical base and is aimed at all-round substantiation of jointly observed in nature manifestations of BL. Within the limits of the being formed complex the possibility of localization of ball lightning in airspace is confirmed. The nature of the one’s radiate capacity is substantiated. The role of environment as source that feeds BL with energy is established. Power supply mechanisms, conditions and peculiarities of BL’s characteristics reproduction through lifetime are specified. The formations channels of energy resources of BL are turned out. Levels of BL’s energy potentialities, both permissibility proper and wide diapason of variation of the ones (multi-faces of ball lightning) as well as the capability of BL to overcome any barriers from dielectric materials by means of penetration through inanes in body of barriers and then to restore the one’s characteristic (octopus’s effect) are substantiated. Adequacy of being formulated conceptual views as a whole is confirmed.

关键词： Ball Lightning Natural Anomaly

Frequency-Concentration Dependence of Optical Activity of a Non-Ideal 1D-Superlattice

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 Modern Physics 2011年第12期2卷 1574-1578页

作者： vladimir v. Rumyantsev Stanislav A Fedorov 不详

In the present work the widths of layers constituting the non-ideal superlattice are much bigger then the characteristic scales of space dispersion. In such a case the contribution of individual layers to gyrotropy can be regarded as independed. Thus the corresponding optical quantities can be expressed through the layers’ gyrotropic characteristics. This approach is applied to calculate the specific rotation angle of plane of polarization of light propagating through a nonideal 1D-superlattice, which varies in composition as well as in layers’ width. We carry out numerical calculation of the frequency dispersion of optical activity of a non-ideal superlattice, which includes impurity layers with point defects.

关键词： Light Propagation Non-Ideal 1D-Superlattice Optical Activity Exciton Region of the Spectrum

Alterations of morphology of lymphoid organs and peripheral blood indicators under the influence of gold nanoparticles in rats

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 Innovative Optical Health Sciences 2016年第1期9卷 47-56页

作者： Alla B.Bucharskaya Svetlana S.Pakhomy Olga v.Zlobina Galina N.Maslyakova Olga v.Matveeva Irina O.Bugaeva Nikita A.Navolokin Boris N.Khlebtsov vladimir A.Bogatyrev Nikolai G.Khlebtsov valery v.Tuchin Saratov State Medical University 112 B.Kazach'ya str.Saratov 410012Russia Institute of Biochemistry and Physiology of Plants and Microorganisms RAS 13 Entuziastov Prospekt.Saratov 410049Russia Saratov State University 83 Astrakhanskaya str.Saratov 410012Russia§Institute of Precise Mechanics and Control of Russian Academy of Sciences 24Rabochaya str.Saratov 410028Russia Interdisciplinary Laboratory of Biophotonics Tomsk State University 36 Lenina str.Tomsk 634050Russia

At present,gold nanoparticles(GNPs)are widely used in biomedical applications such as cancer diagnostics and ***,the potential toxicity hazards of these nanomaterials and human safety concerns are gaining significant ***,we report the effects of prolonged peroral administration of GNPs with different sizes(2,15 and 50 nm)on morphological changes in lymphoid organs and indicators of peripheral blood of laboratory *** experiment was conducted on 24 white mongrel male rats weighing 180–220 g,gold nanospheres sizes 2,15 and 50nm were administered orally for 15 days at a dosage of 190g/kg of animal body *** GNPs were conjugated with polyethylene glycol to increase their biocompatibility and *** size-dependent decrease of the number of neutrophils and lymphocytes was noted in the study of peripheral blood,especially pronounced after administration of GNPs with size of 50 *** stimulation of myelocytic germ of hematopoiesis was recorded at morphological study of the bone *** signs of strengthening of the processes of differentiation and maturation of cellular elements were found in lymph nodes,which were showed as the increasing number of immunoblasts and large *** quantitative changes of cellular component morphology of lymphoid organs due to activation of migration,proliferation and di®erentiation of immune cells indicate the presence of immunostimulation effect of GNPs.

关键词： Gold nanoparticles lymphoid organs morphological changes bone marrow examination

Transcriptional and temporal response of Populus stems to gravi-stimulation

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 Integrative Plant Biology 2018年第7期60卷 578-590页

作者： Matthew Zinkgraf Suzanne Gerttula Shutang Zhao vladimir Filkov Andrew Groover USDA Forest Service Pacific Southwest Research Station 1731 Research Park Drive Davis CA 95618 USA Department of Computer Science University of California Davis One Shields Avenue Davis CA 95618 USA State Key Laboratory of Tree Genetics and Breeding Research Institute of Forestry Chinese Academy of Forestry Beijing 100091 China Department of Plant Biology University of California Davis One Shields Avenue Davis CA 95618 USA

Plants modify development in response to external stimuli, to produce new growth that is appropriate for environmental conditions. For example, gravistimulation of leaning branches in angiosperm trees results in modifications of wood development, to produce tension wood that pulls leaning stems upright. Here, we use gravistimulation and tension wood response to dissect the temporal changes in gene expression underlying wood formation in Populus stems. Using time-series analysis of seven time points over a 14-d experiment, we identified 8,919 genes that were differentially expressed between tension wood （upper） and opposite wood （lower） sides of leaning stems. Clustering of differentially expressed genes showed four major transcriptional responses, including gene clusters whose transcript levels were associated withtwo types of tissue-specific impulse responses that peaked at about 24-48h, and gene clusters with sustained changes in transcript levels that persisted until the end of the 14-d experiment. Functional enrichment analysis of those clusters suggests they reflect temporal changes in pathways associated with hormone regulation, protein Iocalization, cell wall biosynthesis and epigenetic pro- cesses. Time-series analysis of gene expression is an underutilized approach for dissecting complex develop- mental responses in plants, and can reveal gene clusters and mechanisms influencing development.

关键词： Jan Traas University of Lyon France

An efficient synthetic approach towards new 5,5'-diaryl-2,2'-bipyridine-based fluorophores

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2017年第5期28卷 1099-1103页

作者： Alexey P.Krinochkin Dmitry S.Kopchuk Nikolay v.Chepchugov Grigory A.Kim Igor S.Kovalev Matiur Rahman Grigory v.Zyryanov Adinath Majee vladimir L.Rusinov Oleg N.Chupakhin Ural Federal University Yekaterinburg 620002Russian Federation Postovsky Institute of Organic Synthesis of RAS(Ural Division) Yekaterinhurg 620990Russian Federation Department of Chemistry Visva-Bharati(A Central University)Santiniketan 731235India

An efficient approach has been developed for the synthesis of 5,5＇-diaryl-2,2＇-bipyridines via their 1,2,4-triazine *** notable advantages of the present method are：The possibility of varying the aromatic substituents in the positions 5 and 5＇ of bipyridine core and the possibility for obtaining 2,2＇-bipyridines bearing a fused cyclopentene core to increase the solubility in organic *** 5,5＇-diaryl-2,2＇-bipyridines exhibited an intense emission in a range of ca.422-521 nm in acetonitrile solution;depending on the nature of the aromatic substituents and the presence of annulated cyclopentene *** from that,the significant bathochromic shifts of the both absorption and emission maxima were observed in comparison with a number of previously described similar *** some cases the significant increasing of the fluorescence quantum yields took place.

关键词： 2 2'-Bipyridines 1 2 4-Triazines Aza-Diels-Alder reaction Fluorescence

在线全文

学校读者我要写书评

暂无评论

沿阿穆尔板块西边界的活动断层(蒙古领土)

地学前缘 2022年第1期29卷 245-265页

作者： vladimir A.SANKOv Anna v.PARFEEvETS Andrey I.MIROSHNITCHENKO Aleksey v.SANKOv Amgalan BAYASGALAN Sodnomsambuu DEMBEREL Institute of the Earth’s Crust Siberian Branch of the Russian Academy of SciencesIrkutsk 664033Russia Irkutsk State University Irkutsk 664003Russia Institute of Astronomy and Geophysics of the Mongolian Academy of Sciences Ulaanbaatar 51Mongolia

阿穆尔板块西部边界在蒙古境内的空间位置尚不清楚,并且活动断层构造及其沿线地壳的应力状态研究较少。本文在沿此边界的三个区域——杭爱—肯特构造鞍部、布尔古特地块(鄂尔浑—土拉交汇处)和色楞格地块(包括色楞格凹陷和布伦—努鲁隆... 详细信息

阿穆尔板块西部边界在蒙古境内的空间位置尚不清楚,并且活动断层构造及其沿线地壳的应力状态研究较少。本文在沿此边界的三个区域——杭爱—肯特构造鞍部、布尔古特地块(鄂尔浑—土拉交汇处)和色楞格地块(包括色楞格凹陷和布伦—努鲁隆起),利用空间图像解译、地形起伏度分析、地质构造资料以及构造压裂和沿裂缝位移资料重建构造古应力,对活动断层进行研究。研究表明,活动断裂继承了古生代和中生代古构造的非均质性。这些断层沿着板块边界并不是单一的带,而是成簇的。它们的运动取决于走向:亚纬向断层是具有一定逆分量的左旋走滑断层,北西向断层是逆断层或逆冲断层,通常具有右旋走滑分量,海底断层是右旋走滑断层,北东向断层是正断层。位于色楞格凹陷和杭爱东部的断裂构造的活动始于上新世。逆断层和走滑断层与上新世情况不符,但多与更新世地貌相符,表明其活动年代较晚,为更新世时期。利用构造断裂和沿断裂的位移,重建活动断裂带变形末阶段的应力应变状态,结果表明断裂在最大挤压轴的北北东和北东方向上以压缩和走滑为主。只有在色楞格凹陷内,以扩张和走滑类型的应力张量为主,且在最小挤压轴的北西走向尤为显著。在南部,杭爱东部(鄂尔浑地堑)内有1个以扩张机制为主的局部区域,说明蒙古中部断裂在更新世—全新世阶段的活动以及现代地震活动主要受与印度斯坦和欧亚大陆汇聚过程相关的东北方向的附加水平挤压的控制。使研究区地壳产生走滑变形、贝加尔湖裂谷发散活动以及阿穆尔板块东南运动的另一个因素是东南方向软流圈流动对岩石圈底部的影响。阿穆尔板块和蒙古地块之间的边界在构造结构上是零碎的,代表了覆盖整个蒙古西部变形带的边缘部分。

关键词：活动断层古应力状态断层运动学碰撞的远程效应阿穆乐板块蒙古

Plasma transport simulation under different conditions and optimization analysis of dual-stage grid ion thruster

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2023年第7期36卷 388-399页

作者： Yajie HAN Guangqing XIA Bin SUN Chang LU Junjun ZHANG vladimir A.SAETCHNIKOv State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentDalian University of TechnologyDalian 116024China Key Laboratory of Advanced Technology for Aerospace vehicles of Liaoning Province Dalian University of TechnologyDalian 116024China Collaborative Innovation Center of Micro&Nano Satellites of Hebei Province North China Institute of Aerospace EngineeringLangfang 065000China Physics and Aerospace Technology Department Belarusian State UniversityMinsk 220030Belarus

In order to study the extraction and acceleration mechanism of the dual-stage grid,a three-dimensional model based on the Particle-In-Cell/Monte Carlo Collision(PIC/MCC)method is ***-stage grid ion thruster is a new type of electrostatic ion thruster,which can break through the limitations of traditional gridded ion thrusters,and greatly improve the specific *** high performance also makes the grid sensitive to operating *** this paper,the influence of grid parameters on xenon ion thruster’s performance in a wide range is systematically simulated,and the optimal operating condition is *** the over-focusing of the plume,and the transparency of the screen grid are improved,and the grid corrosion is reduced through simulation *** specific impulse under the given working conditions is 9877.24 s and the thrust is 7.28 *** on the simulation optimization,the limitation of the dual-stage grid is *** grid performs well under high voltage conditions(>3000 v)but not well under low voltage conditions(v).Finally,since argon is cheaper and more advantageous in future engineering applications,the plasma distribution and grid extraction ability under xenon and argon are analyzed and compared to study the flexibility of the dual-stage grid ion *** simulation results show that a set of optimal parameters is only applicable to the corresponding propellant,which needs to be optimized for different propellant types.

关键词： 3D modeling Dual-stage grid Ion thruster PIC/MCC method Plasma simulation