检索结果-南通市图书馆

Polariton polarization rectifier

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2019年第1期8卷 505-514页

作者： Evgeny S.Sedov yuri G.Rubo Alexey V.Kavokin Westlake University 18 Shilongshan RoadHangzhou 310024 Zhejiang ProvinceChina Institute of Natural Sciences Westlake Institute for Advanced Study18 Shilongshan RoadHangzhou 310024 Zhejiang ProvinceChina Vladimir State University Gorky str.87Vladimir 600000Russia Instituto de Energias Renovables Universidad Nacional Autonoma de Mexico62580 TemixcoMORMexico Spin Optics Laboratory Saint Petersburg State University1 UlianovskayaSt.Petersburg 198504Russia

We propose a novel photonic device,the polariton polarization rectifier,intended to transform polariton pulses with arbitrary polarization into linearly polarized pulses with controllable orientation of the polarization *** is based on the interplay between the orbital motion of the polariton wave packet and the dynamics of the polariton pseudospin governed by the spatially dependent effective magnetic *** latter is controlled by the TE-TM splitting in a harmonic *** show that the unpolarized polariton pulse acquires linear polarization in the course of propagation in a harmonic *** gives the considered structure an extra function as a linear polarizer of polariton pulses.

关键词： field polarized harmonic

Combining thermodynamics with tensor completion techniques to enable multicomponent microstructure prediction

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 2020年第1期6卷 1643-1653页

作者： yuri Amorim Coutinho Nico Vervliet Lieven De Lathauwer Nele Moelans Department of Materials Engineering(MTM) KU LeuvenB-3001 LeuvenBelgium Department of Electrical Engineering(ESAT) KU LeuvenB-3001 LeuvenBelgium Group Science Engineering and TechnologyKU Leuven KulakB-8500 KortrijkBelgium

Multicomponent alloys show intricate microstructure evolution,providing materials engineers with a nearly inexhaustible variety of solutions to enhance material *** microstructure evolution simulations are indispensable to exploit these *** simulations,however,require the handling of high-dimensional and prohibitively large data sets of thermodynamic quantities,of which the size grows exponentially with the number of elements in the alloy,making it virtually impossible to handle the effects of four or more *** this paper,we introduce the use of tensor completion for highdimensional data sets in materials science as a general and elegant solution to this *** show that we can obtain an accurate representation of the composition dependence of high-dimensional thermodynamic quantities,and that the decomposed tensor representation can be evaluated very efficiently in microstructure *** realization enables true multicomponent thermodynamic and microstructure modeling for alloy design.

关键词： microstructure alloy enable

Optimal cutting condition determination for milling thin-walled details

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Manufacturing 2018年第3期6卷 280-290页

作者： Anton Germashev Viktor Logominov Dmitri Anpilogov yuri Vnukov Vladimir Khristal Mechanical Engineering Department Zaporizhzhya National Technical University Zaporizhzhya 69063 Ukraine Zaporozhye Machine-building Design Bureau Progress State Enterprise Zaporizhya Ukraine

This paper presents an approach for determiningthe optimal cutting condition for milling thin-walled ele-ments with complex shapes. The approach is based on theinteraction between the thin-walled detail and its periodicexcitation by tooth passing, taking into account the highintermittency of such a process. The influence of theexcitation frequency on the amplitude of the detail oscil-lation during milling was determined by simulation andexperiments. It was found that the analytical results agreedwith experimental data. The position of the detail when thetooth starts to cut was evaluated through experiments. Theinfluence of this parameter on the processing state is pre-sented herein. The processing stability is investigated andcompared with the proposed approach. Thereafter, spectralanalyses are conducted to determine the contribution of thevibrating frequencies to the detail behavior during processing.

关键词： Thin-walled detail High-speed milling Stability Surface finish

High resolution imaging using scanning ion conductance microscopy with improved distance feedback control

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2008年第6期18卷 671-677页

作者： Nicholas Johnson Victor Ostanin Andrew Shevchuk yuri Korchev David Klenerman Department of Chemistry University of CambridgeLensfield RoadCambridge CB2 1EWUnited Kingdom Division of Medicine Imperial College LondonMRC Clinical Sciences CentreHammersmith CampusLondon W12 0NNUnited Kingdom

Microscopy is an essential technique for observation on living *** is currently great interest in applying scanning probe microscopy to image-living biological cells in their natural environment at the nanometer *** ion conductance microscopy is a new form of scanning probe microscopy,which enables non-contact high-resolution imaging of living biological *** on a scanned nanopipette in physiological buer,the distance feedback control uses the ion current to control the distance between the pipette tip and the sample ***,this feedback control has diculties over slopes on convoluted cell surfaces,which limits its *** this study,we present an improved form of feedback control that removes the contribution of up to the third-order slope from the ion current signal,hence providing a more accurate signal for controlling the *** show that this allows faster and lower noise topographic high-resolution imaging.

关键词： Living biological cells Scanning ion conductance microscopy Distance feedback control

Local-environment dependence of stacking fault energies in concentrated solid-solution alloys

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2019年第1期5卷 1032-1038页

作者： Shijun Zhao yuri Osetsky G.Malcolm Stocks Yanwen Zhang Materials Science and Technology Division Oak Ridge National LaboratoryOak RidgeTN 37831USA Department of Mechanical Engineering City University of Hong KongHong KongChina Department of Materials Science and Engineering University of TennesseeKnoxvilleTN 37996USA

Concentrated solid-solution alloys(CSAs)based on 3d transition metals have demonstrated extraordinary mechanical properties and radiation resistance associated with their low stacking fault energies(SFEs).Owing to the intrinsic disorder,SFEs in CSAs exhibit distributions depending on local atomic *** this work,the distribution of SFEs in equiatomic CSAs of NiCo,NiFe,and NiCoCr are investigated based on empirical potential and first-principles *** show that the calculated distribution of SFEs in chemically disordered CSAs depends on the stacking fault area using empirical potential *** on electronic structure calculations,we find that local variations of SFEs in CSAs correlate with the charge density redistribution in the stacking fault *** further propose a bond breaking and forming model to understand and predict the SFEs in CSAs based on the local structure *** is shown that the perturbation induced by a stacking fault is localized in the first-nearest planes for NiCo,but extends up to the third nearest planes for NiFe and NiCoCr because of partially filled d electrons in Fe and Cr.

关键词： alloys fault stacking

Atomistic material behavior at extreme pressures

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 2016年第1期2卷 93-96页

作者： Laurent Karim Béland yuri N Osetsky Roger E Stoller Materials Science and Technology Division Oak Ridge National LaboratoryOak RidgeTNUSA

Computer simulations are routinely performed to model the response of materials to extreme environments,such as neutron(or ion)*** latter involves high-energy collisions from which a recoiling atom creates a so-called atomic displacement *** cascades involve coordinated motion of atoms in the form of supersonic *** shockwaves are characterized by local atomic pressures 415 GPa and interatomic distances o2Å.Similar pressures and interatomic distances are observed in other extreme environment,including short-pulse laser ablation,high-impact ballistic collisions and diamond anvil *** cascade simulations using four different force fields,with initial kinetic energies ranging from 1 to 40 keV,show that there is a direct relationship between these high-pressure states and stable defect *** important shortcoming in the modeling of interatomic interactions at these short distances,which in turn determines final defect production,is brought to light.

关键词： extreme defect latter

Gene editing applications to modulate crop flowering time and seed dormancy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

aBIOTECH 2020年第4期1卷 233-245页

作者： Olena Kishchenko Yuzhen Zhou Satyvaldy Jatayev yuri Shavrukov Nikolai Borisjuk Jiangsu Key Laboratory for Eco-Agricultural Biotechnology around Hongze Lake School of Life SciencesHuaiyin Normal UniversityHuai’anChina Jiangsu Collaborative Innovation Centre of Regional Modern Agriculture and Environmental Protection Huaiyin Normal UniversityHuai’anChina Institute of Cell Biology and Genetic Engineering NAS of UkraineKievUkraine Faculty of Agronomy S.Seifullin Kazakh AgroTechnical UniversityNur-SultanKazakhstan College of Science and Engineering Biological SciencesFlinders UniversityAdelaideAustralia

Gene editing technologies such as CRISPR/Cas9 have been used to improve many agricultural traits,from disease resistance to grain ***,emerging research has used CRISPR/Cas9 and other gene editing technologies to target plant reproduction,including major areas such as flowering time and seed *** related to these areas have important implications for agriculture,as manipulation of flowering time has multiple applications,including tailoring crops for regional adaptation and improving ***,understanding seed dormancy will enable approaches to improve germination upon planting and prevent pre-harvest ***,we summarize trends and recent advances in using gene editing to gain a better understanding of plant reproduction and apply the resulting information for crop improvement.

关键词： Genome editing CRISPR/Cas9 Flowering time Florigen Seed dormancy

Isotopic Composition of Atmospheric Precipitation in the Cis-Ural Region

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3期33卷 831-838页

作者： Alena S.Kazantseva Olga I.Kadebskaya yuri V.Dublyansky Mining Institute of the Ural Branch of the Russian Academy of Sciences PermRussia Institute of Geology University of InnsbruckInnsbruckAustria

Using the Global Network of Isotopes in Precipitation(GNIP)method at three stations in the Cis-Ural region(Iskor,Perm,and Kungur),the monitoring results of the isotope composition of atmospheric precipitation conducted in 2016-2019 are *** lines of meteoric waters were obtained for each station and for the Cis-Ural region as a *** latitudinal zoning of changes in isotope parameters from north to south in the Cis-Ural region is noted,which is related to meteorological *** northern regions are characterized by isotopically light values compared to the southern ***,the correlation relationship between the isotopic compositions of atmospheric precipitation and meteorological parameters at each station is *** analysis data show that about 50%-90%of variations in the isotopic composition of precipitation within the annual cycle are determined by the air *** the same time,the amount of precipitation shows a relationship between the average strength and the isotopic composition of precipitation for a series of observations at Kungur Station;for a series of observations at Iskor and Perm stations,there is no *** in the relationship with meteorological data are explained by different sources of moisture introduction to the station and,accordingly,the formation of the isotopic composition of *** flow of moisture is controlled by the transfer of air masses in different directions,the formation of cyclones and ***,for the northern part of the region during the year is characterized by the predominance of cyclones,whereas for the southern-anticyclones.

关键词： precipitation isotopic composition Cis-Ural region correlation relationship Spear-man’s correlation coefficient

Nitrogen and Carbon Isotope Data of Olenekian to Anisian Deposits from Kamenushka/South Primorye, Far-Eastern Russia and Their Palaeoenvironmental Significance

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2018年第4期29卷 837-853页

作者： yuri D Zakharov Micha Horacek Alexander M Popov Liana G Bondarenko Far Eastern Geological Institute of Russian Academy of Sciences (Far Eastern Branch) Stoletiya Prospect 159 Vladivostok 690022 Russia BLT Wieselburg Research Center HBLFA Francisco-Josephinum Wieselburg 3250 Austria Institute of Lithospheric Research Vienna University Vienna 1090 Austria

The Kamenushka Formation, exposed in the northern part of South Primorye （Kamennshka-1 and Kamenushka-2 sections）, is one of the few localities in the world with richly fossiliferous Lower-Upper Olenekian sedimentary successions. Lower to Middle Triassic ammonoid-, brachiopod- and conodont-bearing silty-clayey deposits of the Kamenushka-1 and Kamenushka-2 sections have been isotope-geochemically investigated in detail. As a result, these sections, together with the previously investigated Abrek Section, exposed in the southern part of South Primorye, provide almost complete ^15Non- and ^13Corg- records for the Lower Triassic of this region. Nine N- isotope intervals and the five negative C-isotope excursions, reflecting, apparently, unstable climatic and hydrological conditions, have been distinguished in the Lower Triassic of South Primorye. On the basis of the new C-isotope data the Mesohedenstroemia bosphorensis Zone （upper part）, Shimanskyites shimanskyi and Neocolumbites insignis zones of South Primorye are correlated now with the Lower Smithian part of the Yinkeng Formation, the Upper Smithian part of the Helongshan Formation and the Middle Spathian part of the Nanlinghu Formation in South China, respectively, as has been observed in the Abrek, Kamenushka-2, West Pingdingshan and Majiashan sections.

关键词： Triassic N- and C-isotopes palaeoclimatology bio- and chemostratigraphy Pri- morye Russia.