检索结果-南通市图书馆

Frontiers of Earth Science 2016年第3期10卷 560-569页

作者： Sergey V. TROFIMENKO Victor G. BYKOV nikolay V. SHESTAKOV nikolay N. GRIB Hiroaki TAKAHASHI Institute of Tectonics and Geophysics Far Eastern Branch Russian Academy of Sciences Khabarovsk 680000 Russia North-Eastern Federal University Neryungri 678960 the Republic of Sakha (Yakutia) Russia Institute for Applied Mathematics Far Eastern Branch Russian Academy of Sciences Vladivostok 690041 Russia Far Eastern Federal University Vladivostok 690041 Russia Institute of Seismology and Volcanology Graduate School of Science Hokkaido University Sapporo 060-0810 Japan

This study provides new insights into the nature of seasonal variations in coordinate time series of GPS sites located near active faults and methods of their modeling. Monthly averaged coordinate time series were analyzed for several pairs of collocated GPS sites situated near the active fault intersection area, in close proximity to the central part of the northern boundary of the Amurian plate and the vicinity of the San Andreas Fault zone. It is concluded that the observed seasonal variations are best described by a breather function which is one of the solutions of the well-known sine-Gordon equation. The obtained results suggest that, in this case, the source of seasonal variations may be caused by the appearance of solitary strain waves in the fault intersection system, which may be qualitatively treated as standing waves of compression-extension of the geological medium. Based on statistical testing, the limits of applicability of the suggested model have been established.

关键词： space geodetic surveys oscillatory move-ments of crustal blocks seasonal variations Amurianmicroplate

Current approaches to the management of patients with cirrhotic ascites

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2019年第28期25卷 3738-3752页

作者： Dmitry Victorovich Garbuzenko nikolay Olegovich Arefyev Department of Faculty Surgery South Ural State Medical University Chelyabinsk 454092 Russia Department of Pathological Anatomy and Forensic Medicine South Ural State Medical University Chelyabinsk 454092 Russia

This review describes current approaches to the management of patients with cirrhotic ascites in relation to the severity of its clinical manifestations. The PubMed database, the Google Scholar retrieval system, the Cochrane Database of Systematic Reviews, and the reference lists from related articles were used to search for relevant publications. Articles corresponding to the aim of the review were selected for 1991-2018 using the keywords:“liver cirrhosis,”“portal hypertension,”“ascites,”“pathogenesis,”“diagnostics,” and “treatment.” Uncomplicated and refractory ascites in patients with cirrhosis were the inclusion criteria. The literature analysis has shown that despite the achievements of modern hepatology, the presence of ascites is associated with poor prognosis and high mortality. The key to successful management of patients with ascites may be the stratification of the risk of an adverse outcome and personalized therapy. Pathogenetically based approach to the choice of pharmacotherapy and optimization of minimally invasive methods of treatment may improve the quality of life and increase the survival rate of this category of patients.

关键词： Liver cirrhosis Ascites Diuretics Large volume paracentesis Peritoneovenous shunting Transjugular intrahepatic portosystemic shunting

Preface: Modern studies of variable stars

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2019年第3期19卷 1-2页

作者： nikolay N.Samus Sheng-Bang Qian Institute of Astronomy Russian Academy of Sciences Yunnan Observatories Chinese Academy of Sciences

In this Mini-Volume, seven papers written on the basis of talks selected from those presented at the scientific conference "Modern studies of variable stars," commemorating Prof. M. A. Svechnikov(1933–2011), are published. The conference covered a variety of variable-star topics; the papers in this Mini-Volume deal with close, mainly eclipsing, binaries, Herbig Be stars and stellar molecular masers, with an accent on stellar catalogs of different kinds. We briefly review the contents of these papers.

关键词： stars variable-stars binaries-ISM general

Controlling light with light using coherent metadevices: all-optical transistor, summator and invertor

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2015年第1期4卷 360-366页

作者： Xu Fang Kevin F MacDonald nikolay I Zheludev Optoelectronics Research Centre&Centre for Photonic Metamaterials University of Southampton SO171BJUK Centre for Disruptive Photonic Technologies TPINanyang Technological UniversitySingapore 637371Singapore

Although vast amounts of information are conveyed by photons in optical fibers,the majority of data processing is performed electronically,creating the infamous‘information bottleneck’and consuming energy at an increasingly unsustainable *** potential for photonic devices to directly manipulate light remains unfulfilled due largely to a lack of materials with strong,fast optical *** this paper,we show that small-signal amplifier,summator and invertor functions for optical signals may be realized using a four-port device that exploits the coherent interaction of beams on a planar plasmonic metamaterial,assuming no intrinsic *** redistribution of energy among ports can provide nonlinear input-output signal dependencies and may be coherently controlled at very low intensity levels,with multi-THz bandwidth and without introducing signal distortion,thereby presenting powerful opportunities for novel optical data processing architectures,complexity oracles and the locally coherent networks that are becoming part of the mainstream telecommunications agenda.

关键词： all-optical data processing coherent control photonic metamaterials

The left-right side-specific endocrine signaling:implications for neurological deficits in stroke and neurodevelopmental disorders

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2022年第11期17卷 2431-2433页

作者： Georgy Bakalkin nikolay Lukoyanov Igor Lavrov Mengliang Zhang Department of Pharmaceutical Biosciences Uppsala University Departamento de Biomedicina da Faculdade de Medicina da Universidade do Porto Instituto de Investiga??o e Inova??o em SaúdeInstituto de Biologia Molecular e Celular Department of Neurology Mayo Clinic Department of Molecular Medicine University of Southern Denmark

Brain injury-induced neurological deficits typically develop on the contralateral side of the body and include abnormal posture,motor weakness,and *** is believed that the interruption of descending neural pathways th... 详细信息

关键词： neurological typically deficit

A Semantic Approach to Workflow Management and Reuse for Research Problem Solving

在线全文

学校读者我要写书评

暂无评论

Data Intelligence 2022年第2期4卷 439-454页

作者： nikolay A.Skvortsov Sergey A.Stupnikov Federal Research Center"Computer Science and Control"of the Russian Academy of Sciences Moscow 119333Russia

The investigation proposes the application of an ontological semantic approach to describing workflow control patterns,research workflow step patterns,and the meaning of the workflows in terms of domain *** approach can provide wide opportunities for semantic refinement,reuse,and composition of *** reasoning allows verifying those compositions and implementations and provides machine-actionable workflow manipulation and problem-solving using *** described approach can take into account the implementation of workflows in different workflow management systems,the organization of workflows collections in data infrastructures and the search for them,the semantic approach to the selection of workflows and resources in the research domain,the creation of research step patterns and their implementation reusing fragments of existing workflows,the possibility of automation of problemsolving based on the reuse of *** application of the approach to CWFR conceptions is proposed.

关键词： Workflow reuse Workflow patterns,Domain ontology Canonical workflow framework for research,CWFR Principles of FAIR data

Mechanochemical Synthesis and Characterization of Nanocrystalline Copper-Cobalt Ferrites

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2015年第3期28卷 367-372页

作者： nikolay Velinov Dimitar Dimitrov Kremena Koleva Krassimir Ivanov Ivan Mitov Institute of Catalysis Bulgarian Academy of Sciences Department of Chemistry Agricultural University

Nanocrystalline copper-cobalt ferrites with composition Cu_（1-x）Co_xFe_2O_4,where x = 0.2 and 0.8,were synthesized by mechanochemical treatment of co-precipitated *** ferrite powders were characterized by XRD and Mossbauer *** proved obtaining of spinel ferrites with crystallite size smaller than 10 *** of crystallite size of samples with increasing of mechanochemical treatment duration was established,*** properties of obtained ferrites were tested in reactions of oxidation of CO,methanol and dimethyl *** catalytic activity of nanocrystalline copper-cobalt ferrites toward CO and CH_3OH（about 100% conversions of CO and CH_3OH at 160 ℃）and moderate activity toward（CH_3）_2O oxidation were *** results obtained revealed that the Co/Cu atomic ratio is an important factor determinant the behavior of catalysts toward methanol and DME oxidation.

关键词： Mechanochemical synthesis Nanocrystalline Ferrites Mossbauer spectroscopy Catalysis

Synchronous machine performance under geomagnetic disturbances

在线全文

学校读者我要写书评

暂无评论

High Voltage 2021年第5期6卷 894-903页

作者： Ilja Boguslawsky nikolay Korovkin Victor Popov Olga Sokolova Peter the Great St.Petersburg Polytechnic University St.PetersburgRussia Paul Scherrer Institute(PSI) VilligenSwitzerland

Geomagnetic disturbances(GMDs)are known to disturb power system equipment *** danger is associated with geomagnetically induced currents(GICs)occurring at the Earth's surface during *** do not endanger power system operation conditions by *** main challenge posed by GICs to power system states is the change in power system equipment operation conditions provoked by GIC *** primary avenue of blackout caused by GMDs is through power ***,in turn,can impair the operation of other power system equipment such as syn-chronous *** powerful synchronous machines are not designed and engineered to cope with the negative impacts of ***,the actual legal norms are inadequate in this *** the grid's resiliency to such an event is highly interesting to the *** physical processes in synchronous machine windings triggered by GICs and limitations brought to power grid operations are ***,the idea of the impact of GMDs on the power grid operation is *** analysis of the impact of GMDs on synchronous machines is performed in the second *** the end,the power system response under GMDs is studied.

关键词： geomagnetic Earth performance

Preface: Stars and interstellar medium

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2018年第8期18卷 1-3页

作者： nikolay N.Samus Yan Li Institute of Astronomy Russian Academy of Sciences Yunnan Observatories Chinese Academy of Sciences

This issue presents proceedings of the ＂Stars and Interstellar Medium＂ section of the All- Russian Astronomical Conference VAK-2017. Sixteen papers （selected from about 70 talks） cover dif- ferent problems related... 详细信息

关键词： stars: binaries - ISM general - ISM clouds

“Plasmonics”in free space:observation of giant wavevectors,vortices,and energy backflow in superoscillatory optical fields

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2019年第1期8卷 1161-1169页

作者： Guanghui Yuan Edward T.F.Rogers nikolay I.Zheludev Centre for Disruptive Photonic Technologies The Photonic InstituteSchool of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore Optoelectronics Research Centre and Centre for Photonic Metamaterials University of SouthamptonHighfieldSouthampton SO171BJUK Institute for Life Sciences University of SouthamptonHighfieldSouthampton SO171BJUK

Evanescent light can be localized at the nanoscale by resonant absorption in a plasmonic nanoparticle or taper or by transmission through a ***,a conventional lens cannot focus free-space light beyond half of the wavelength λ.Nevertheless,precisely tailored interference of multiple waves can form a hotspot in free space of an arbitrarily small size,which is known as ***,we report a new type of integrated metasurface interferometry that allows for the first time mapping of fields with a deep subwavelength resolution ~λ/*** findings reveal that an electromagnetic field near the superoscillatory hotspot has many features similar to those found near resonant plasmonic nanoparticles or nanoholes:the hotspots are surrounded by nanoscale phase singularities and zones where the phase of the superoscillatory field changes more than tenfold faster than a freepropagating plane *** with high local wavevectors are pinned to phase vortices and zones of energy backflow(~λ/20 in size)that contribute to tightening of the main focal spot size beyond the Abbe-Rayleigh *** observations reveal some analogy between plasmonic nanofocusing of evanescent waves and superoscillatory nanofocusing of free-space waves and prove the fundamental link between superoscillations and superfocusing,offering new opportunities for nanoscale metrology and imaging.

关键词： metrology free wave