检索结果-南通市图书馆

Nano Research 2022年第6期15卷 5705-5711页

作者： Wei-Xing Chen nikolay v.tkachenko Alvaro Muñoz-Castro Alexander I.Boldyrev Zhong-Ming Sun State Key Laboratory of Elemento-Organic Chemistry Tianjin Key Lab of Rare Earth Materials and ApplicationsSchool of Materials Science and EngineeringNankai UniversityTianjin 300350China Department of Chemistry and Biochemistry Utah State University0300 Old Main HillLoganUT 84322-0300USA Grupo de Química Inorgánicay Materiales Moleculares Facultad de IngenieriaUniversidad Autonoma de ChileEl Llano SubercaseauxSantiago 2801Chile

In this work,we report the synthesis and characterization of two novel Ru-containing Zintl clusters:[Sn_(19){Ru(COD)(en)}_(2)]^(4−)and[Sn_(20){Ru(COD)}_(2)]^(6−).The synthesized compounds not only expand the family of Ru-Sn cluster systems but also shed light on the structure of heterometallic complexes in a previously unknown range of tin *** single-crystal X-ray diffraction(XRD)analysis reveals the dimeric nature of the *** different assembly patterns of the formal[Sn(η^(3)-Sn_(9))]monomer were observed:the dimerization through the vertex fusion process and the direct dimerization through the formation of 2c–2e Sn–Snσ*** both clusters,the density functional theory calculations reveal the locallyσ-aromatic nature of the[Sn(η^(3)-Sn_(9))]monomer resulting in two independent magnetic shielding *** believe that our findings will help the community to further explore the fascinating chemistry of polystannide clusters.

关键词： heterometallic clusters aromaticity polystannide ruthenium Zintl anion

Synthesis and Structure of Binary Copper/Silver-Arsenic Clusters Derived from Zintl Ion As_(7)^(3-)

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 Journal of Chemistry 2022年第1期40卷 65-70页

作者： Wei-Qiang Zhang nikolay v.tkachenko Lei Qiao Alexander I.Boldyrev Zhong-Ming Sun State Key Laboratory of Elemento-Organic Chemistry Tianjin Key Lab for Rare Earth Materials and ApplicationsSchool of Materials Science and EngineeringNankai UniversityTianjin 300350China Department of Chemistry and Biochemistry Utah State University 0300 Old Main HillLoganUT 84322-0300USA

Polyarsenides containing coinage metals,[As_(7)Cu(PPh_(3))]^(2-)(1)and[M_(2)As_(14)]^(4-)(M=Cu,2;Ag,3),were synthesized by reactions of the nominal composition K_(3)As_(7) with Group 11 metal *** possible intermediate,cluster 1,was isolated from the solution phase through subtle changes in reaction conditions in the formation process of complex ***,we establish the pathway of the bimetallic bridged clusters[Cu_(2)As_(14)]^(4-)by the oxidation of the[As_(7)Cu(PPh_(3))]^(2-).Quantum chemical calculations reveal the presence of metallophilic interaction in clusters 2 and 3.

关键词： Polyarsenide cluster Reaction mechanism Zintl ions Covalently bound Metallophilic interaction

Modeling of ultrafast X-ray induced magnetization dynamics in magnetic multilayer systems

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 2022年第1期8卷 2044-2052页

作者： K.J.Kapcia v.tkachenko F.Capotondi A.Lichtenstein S.Molodtsov L.Müller A.Philippi-Kobs P.Piekarz B.Ziaja Center for Free-Electron Laser Science CFEL Deutsches Elektronen-Synchrotron DESYNotkestr.8522607HamburgGermany Institute of Spintronics and Quantum Information Faculty of PhysicsAdam Mickiewicz University in PoznańPoznańPoland Institute of Nuclear Physics Polish Academy of SciencesKrakówPoland European XFEL GmbH SchenefeldGermany Elettra-Sincrotrone Trieste S.C.p.A TriesteBasovizzaItaly University of Hamburg HamburgGermany Deutsches Elektronen-Synchrotron DESY Notkestr.8522607HamburgGermany

In this work,we report on modeling results obtained with our recently developed simulation tool enabling nanoscopic description of electronic processes in X-ray irradiated ferromagnetic *** this tool,we have studied the response of Co/Pt multilayer system irradiated by an ultrafast extreme ultraviolet pulse at the M-edge of Co(photon energy~60 ev).It was previously investigated experimentally at the FERMI free-electron-laser facility,using the magnetic small-angle X-ray scattering *** simulations show that the magnetic scattering signal from cobalt decreases on femtosecond timescales due to electronic excitation,relaxation,and transport processes both in the cobalt and in the platinum layers,following the trend observed in the experimental *** confirmation of the predominant role of electronic processes for X-ray induced demagnetization in the regime below the structural damage threshold is a step toward quantitative control and manipulation of X-ray induced magnetic processes on femtosecond timescales.

关键词： magnetization multilayer cobalt

Dynamics of a fluid-filled curvilinear pipeline

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2018年第6期39卷 905-922页

作者： v.A.RUKAvISHNIKOv O.P.tkachenko Computing Center of Far-Eastern Branch Russian Academy of Sciences

A mathematical model is presented, and numerical experiments are performed to describe the mechanics of the slow movement of a pipeline. The problem reduction algorithm to one-dimensional formulation is offered. Results of numerical experiment for the model problem are adduced. The proposed mathematical model is found to adequately describe the dynamics of known phenomena of pipes. The cross-sections of the extended curvilinear thin-walled pipeline are numerically demonstrated to experience warping, which has experimental confirmation in the literature.

关键词： bent pipeline numerical experiment hydroelasticity shell theory

A new insight into the nature of seasonal variations in coordinate time series of GPS sites located near active faults

在线全文

学校读者我要写书评

暂无评论

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

Fluctuating fine-scale spatial genetic structure in the common shrews (Eulipotyphla, Mammalia)

在线全文

学校读者我要写书评

暂无评论

Integrative Zoology 2023年第3期18卷 469-492页

作者： nikolay A.SHCHIPANOv Artem v.ARTAMONOv Sergey v.TITOv Svetlana v.PAvLOvA A.N.Severtsov Institute of Ecology and Evolution Russian Academy of SciencesMoscowRussia Department of Zoology and Ecology Penza State UniversityPenzaRussia

The spatial genetic structure is a topical issue in the studies of various aspects of ecology and *** the multilocus autocorrelation method with hypervariable microsatellite genetic markers,we investigated aﬁne-scale pattern of genetic structure in 5 local populations of the common shrew Sorex araneus separated by distances of 300–1000 m(the Moscow chromosomal race).Spatial genetic autocorrelation analysis based on 5 microsatellite loci(expected heterozygosity>0.79)with 90 alleles revealed a consistent pattern of signiﬁcant positive genetic *** testing the autocorrelation at multiple scales from 25 to 500 m,we found that positive spatial genetic structure is detectable in distance classes ofvely correlated with a higher ratio of nonresident individuals to residents’activity(number of captures).In contrast to nonresident animals,the residents demonstrated prominent genetic *** difference(FST)between the populations was signiﬁcant(0.016–0.051)and comparable with that between populations of different races analyzed previously(0.016–0.038).FST was not associated with geographic *** demographic patterns allowed us to propose a scheme of genetic-structure dynamics involving periodic appearance of more related local groups and renewal of allelic proﬁles fromаcommon pool where the alleles are *** scheme predictsﬂuctuating genetic structure and random similar differences among local populations.

关键词： demographic pattern geneﬂow microsatellite spatial autocorrelation

RF thermal and new cold part design studies on a TTF-Ⅲ input coupler for Project-X

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 Physics C 2012年第2期36卷 173-178页

作者： PEI Shi-Lun Chris E Adolphsen LI Zeng-Hai nikolay A Solyak Ivan v Gonin Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China SLAC National Accelerator Laboratory Menlo ParkCalifornia 94025USA Fermi National Accelerator Laboratory Batavia 60510IllinoisUSA

An RF power coupler is one of the key components in a superconducting （SC） linac. It provides RF power to the SC cavity and interconnects different temperature layers （1.8 K, 4.2 K, 70 K and 300 K）. The TTF-Ⅲ coupler is one of the most promising candidates for the High Energy （HE） linac of Project X, but it cannot meet the average power requirements because of the relatively high temperature rise on the warm inner conductor, so some design modifications will be required. In this paper, we describe our simulation studies on the copper coating thickness on the warm inner conductor with RRR values of 10 and 100. Our purpose is to rebalance the dynamic and static loads, and finally lower the temperature rise along tbe warm inner conductor. In addition, to get stronger coupling, better power handling and less multipacting probability, one new cold part design was proposed using a 60 mm coaxial line; the corresponding multipacting simulation studies have also been investigated.

关键词： RF thermal effect TTF-Ⅲ input coupler multipacting dynamic RF power loss static thermal loss

Ion-conducting Membranes Based on Bacterial Cellulose Nanofibers Modified by Poly(sodium acrylate-co-2-acrylamido-2-methylpropanesulfonic acid)

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第3期42卷 333-343,I0007页

作者： Elizaveta v.Batishcheva nikolay N.Smirnov Natalya v.Bobrova Maria P.Sokolova Michael A.Smirnov Institute of Macromolecular Compounds Russian Academy of SciencesBolshoy pr.31Saint Petersburg 199004Russia

Green method for preparation of ion-conducting membranes(ICM) based on bacterial cellulose nanofibers(CNF) modified by a copolymer of sodium acrylate and 2-acrylamido-2-methylpropanesulfonic acid was elaborated. FTIR and NMR data confirmed grafting of polyacrylate onto cellulose surface. Formation of porous structure of the ICM was controlled by SEM and AFM. The maximal ionic conductivity of the membranes reaches 1.5 and 3.1 mS·cm^(-1)(60 ℃ and 98% relative humidity) when they are saturated with water or H_2SO_4(1 mol·L^(-1)) electrolyte,respectively. Prepared ICM was tested as a separator in a symmetrical supercapacitor with electrodes based on polyaniline hydrogel. The assembled cell demonstrate ability to operate at high current density up to 100 A·g^(-1) maintaining specific capacitance 165 F·g^(-1). Maximal specific capacitance of 289 F·g^(-1) was achieved at current density 1 A·g^(-1). Retaining of 90% of initial capacitance after 10000 of charge-discharge cycles proves high electrochemical stability of prepared ICM.

关键词： Bacterial cellulose Ion conductivity Porous membrane Supercapacitor

Methods for the use of the best Russian innovations in forest fire detection and suppression

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2021年第6期32卷 2255-2263页

作者： Alexander A.Martynyuk vera A.Savchenkova nikolay A.Korshunov Roman v.Kotelnikov All-Russian Research Institute of Silviculture and Mechanization of Forestry(ARRISMF) Institutskaya str.15PushkinoMoscow regionRussia141202

This paper addresses the final stage of the study concerning the practical use of the best Russian methods,technologies and means for detecting and extinguishing forest fires in *** general,the work is aimed at increasing the effectiveness of the forest fire protection system by improving the methodological and technical support for the use of the best new *** the course of the study,analytical methods have been applied,tested and used in silviculture,while developing and improving the regulatory legal and methodological *** on the selection of research directions in the preliminary stages of work,analysis of the current state,use,and the development forecast of the most effective and promising technologies was carried *** addition,for detecting,controlling and extinguishing forest fires,including a comparative analysis of their economic efficiency,methods for practical use of the best Russian innovations was developed.A significant number of new developments have accumulated which,for a number of reasons,have not been *** into account the current state and dynamics of these promising methods,technologies,means of detecting and extinguishing forest fires,this study substantiates the development forecast of these promising innovations and their *** structure includes general provisions,concepts and terminology,regulatory support,the procedure for assessing the feasibility and effectiveness of the innovations,as well as a list of recommended documents for studying the use of technology for detecting,controlling and extinguishing forest *** methods will help meet modern requirements for the protection of forests from wildfires,and present an algorithm for their implementation in practice.

关键词： Forest protection Fire suppression Wildfire Efficacy

Anomalous Laterally Stressed Kinetically Trapped DNA Surface Conformations

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2021年第8期13卷 263-280页

作者： valery v.Prokhorov nikolay A.Barinov Kirill A.Prusakov Evgeniy v.Dubrovin Maxim D.Frank-Kamenetskii Dmitry v.Klinov Federal Research and Clinical Center of Physical-Chemical Medicine Malaya Pirogovskaya1aMoscow 119435Russian Federation A.N.Frumkin Institute of Physical Chemistry and Electrochemistry RASLeninsky prospect Moscow 199071 Russian Federation 3 Moscow Institute of Physics and TechnologyInstitutskiy per.9Dolgoprudny141700 MoscowRussian Federation Lomonosov Moscow State University Leninskie gory1-2Moscow 119991Russian Federation Department of Biomedical Engineering Boston University44 Cummington MallBoston MA02215USA

Up to now,the DNA molecule adsorbed on a surface was believed to always preserve its native *** belief implies a negligible contribution of lateral surface forces during and after DNA adsorption although their impact has never been ***-resolution atomic force microscopy was used to observe that stiff DNA molecules kinetically trapped on monomolecular films comprising one-dimensional periodically charged lamellar templates as a single layer or as a sublayer are oversaturated by sharp discontinuous kinks and can also be locally melted and *** argue that kink/anti-kink pairs are induced by an overcritical lateral bending stress(>30 pNnm)inevitable for the highly anisotropic 1D-1D electrostatic interaction of DNA and underlying rows of positive surface *** addition,the unexpected kink-inducing mechanical instability in the shape of the template-directed DNA confined between the positively charged lamellar sides is observed indicating the strong impact of *** previously reported anomalously low values of the persistence length of the surface-adsorbed DNA are explained by the impact of the surface-induced low-scale *** sites of the local melting and supercoiling are convincingly introduced as other lateral stress-induced structural DNA anomalies by establishing a link with DNA high-force *** results open up the study in the completely unexplored area of the principally anomalous kinetically trapped DNA surface conformations in which the DNA local mechanical response to the surface-induced spatially modulated lateral electrostatic stress is essentially *** underlying rich and complex in-plane nonlinear physics acts at the nanoscale beyond the scope of applicability of the worm-like chain approximation.

关键词： DNA surface conformations Kinetic trapping Lateral stress Periodically charged surface DNA kinks