检索结果-南通市图书馆

Intermediate carriers for UAV swarms:problem of fleet composition

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2013年第1期24卷 101-107页

作者： viacheslav Zotov Xiaoguang Gao School of Electronics and Information Northwestern Polytechnical University

This article introduces a fleet composition algorithm for a fleet of intermediate carriers, which should deliver a swarm of miniature unmanned aerial vehicles （mini-UAVs） to a mission area. The algorithm is based on the sequential solution of several knapsack problems with various constraints. The algorithm allows both to form an initial set of required types of intermediate carriers, and to generate a fleet of intermediate carriers. The formation of a fleet of intermediate carriers to solve a suppression of enemy air defense （SEAD） problem is presented to illustrate the proposed algorithm.

关键词： fleet composition knapsack problem linear programming unmanned aerial vehicle (UAV) suppression of enemy air defense (SEAD) logistics.

A novel freemium code SAND(v1.0)for generation of randomly packed beds

在线全文

学校读者我要写书评

暂无评论

Particuology 2024年第12期95卷 198-211页

作者： Nikita Shadymov viacheslav Papkov Dmitry Pashchenko Samara State Technical University Molodogvardeiskaya 244 StSamara443100Russia Department of Mechanical Engineering(Robotics) Guangdong Technion-Israel Institute of Technology241 Daxue RoadShantouGuangdong515063China Faculty of Mechanical Engineering Technion-Israel Institute of TechnologyTechnion CityHaifa3200003Israel Guangdong Provincial Key Laboratory of Materials and Technologies for Energy Conversion Guangdong Technion—Israel Institute of TechnologyGuangdong515063China

The main current approaches for generation of the packed bed models are based on rigid body dynamics(RBD)and Newton's laws(discrete element methods-DEM).This paper deals with the development and analysis of a novel code based on analytical geometry approach for the packed bed *** architecture and main algorithms of the novel code are described and *** parameters of the packed bed generated via the novel code are compared with experimental data and packed beds generated via Blender(RBD),Yade(DEM).The novel code demonstrates many advantages,such as good correlation with experimental data,no overlaps between pellets in the packed bed,and a low computational time for packed bed *** packed bed model can be directly exported *** *** advantages are also demonstrated and *** novel code is attached to this paper and can be freely used by engineers and scientists.

关键词： Packed bed Discrete element method Python-based code CAD software

Emergence of instability-driven domains in soft stratified materials

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 931-936页

作者： Jian Li viacheslav Slesarenko Stephan Rudykh Key Laboratory of Traffic Safety on Track of Ministry of Education School of Traffic&Transportation EngineeringCentral South UniversityChangshaHunan410075China Joint International Research Laboratory of Key Technology for Rail Traffic Safety Central South UniversityChangsha410075China National&Local Joint Engineering Research Center of Safety Technology for Rail Traffic Vehicle Central South UniversityChangsha410075China Cluster of Excellence livMatS@FIT–Freiburg Center for Interactive Materials and Bioinspired Technologies University of FreiburgGeorges-Köhler-Allee 105D-79110FreiburgGermany Department of Mechanical Engineering University of Wisconsin—MadisonMadisonWI53706USA School of Mathematical&Statistical Sciences National University of Ireland GalwayUniversity RoadGalwayIreland

Nature frequently employs the buckling phenomenon to facilitate the formation of complicated patterns across *** knowledge,however,is limited to a small set of buckling-induced microstructure transformations in soft composites;and the pattern formation phenomenon remains largely unknown for a vast pool of material ***,we investigate the unexplored rich domain of soft heterogeneous *** experimentally observe the formation of instability-driven domains in stratified composites with a non-dilute stiff *** illustrate that the discovered domain patterns are energetically favorable over ***,we introduce a closed-form analytical expression allowing us to predict the evolution of the patterns in the post-buckling ***,we show that various patterns can be pre-designed via altering material *** findings can help advance our understanding of the mechanisms governing pattern formations in soft biological tissues,and potentially enable the platform for mechanical metamaterials.

关键词： composites buckling stratified

Influence of Al-5Ti-1B master alloy addition on the grain size of AZ91 alloy

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 Magnesium and Alloys 2017年第3期5卷 313-319页

作者： Andrey Koltygin viacheslav Bazhenov Uralboy Mahmadiyorov National University of Science and Technology“MISiS” Leninskiy pr.4Moscow 119049Russia

The mechanical properties of castings depend on the grain *** is evidence that titanium and boron(Al-5Ti-1B master alloy)affect the grain size of magnesium ***,the influence of the addition of 0-1 wt.%of Al-5Ti-1B master alloy on the grain size of AZ91 magnesium alloy was *** of the alloy was performed in steel and corundum *** study the effect of cooling rate on grain size,cylindrical samples were cast in steel and fireclay *** Al-5Ti-1B master alloy addition did not change the phase composition of the AZ91 *** study demonstrates that the addition of Al-5Ti-1B did not contribute to the grain refinement of the AZ91 alloy,but rather led to its coarsening for samples cast in both the steel and fireclay *** the holding time after the addition of the Al-5Ti-1B master alloy from 15 to 110 minutes also did not lead to significant grain *** mechanical properties of the AZ91 alloy samples slightly improved after Al-5Ti-1B addition.

关键词： AZ91 magnesium alloy Grain refinement Al–5Ti–1B master alloy Ti addition Growth restriction factor

N-环钯化二茂铁衍生物的合成和应用（英文）

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

有机化学 2018年第1期38卷 75-85页

作者： viacheslav I.Sokolov 俄罗斯科学院有机化合物研究所莫斯科119991

近年研究表明二茂铁的环钯化衍生物被广泛地应用于各类偶联反应中,比如Heck反应、Suzuki反应、aza-Claisen重排反应等.主要综述了含氮导向基的二茂铁衍生物的环钯化反应,包括通过不对称诱导或拆分手段合成具有平面手性环钯化合物,基于... 详细信息

近年研究表明二茂铁的环钯化衍生物被广泛地应用于各类偶联反应中,比如Heck反应、Suzuki反应、aza-Claisen重排反应等.主要综述了含氮导向基的二茂铁衍生物的环钯化反应,包括通过不对称诱导或拆分手段合成具有平面手性环钯化合物,基于环金属化反应1,1'-取代二茂铁钯化物的合成,以及其在催化反应的应用.

关键词：环钯化二茂铁基二胺二茂铁基亚胺对映选择性交叉偶联反应 Heck反应 Suzuki反应 aza-Claisen重排

Extended Modules and Ore Extensions

在线全文

学校读者我要写书评

暂无评论

Communications in Mathematics and Statistics 2016年第2期4卷 189-202页

作者： viacheslav Artamonov Oswaldo Lezama William Fajardo Moscow State University MoscowRussia Universidad Nacional de Colombia BogotaColombia

In this paper,we study extended modules for a special class of *** will assume that R is a ring and A will denote the Ore extensionA:=R[X1,...,xn;σ]for whichσis an automorphism of R,xixj=xjxi and xir=σ(r)xi,for eve... 详细信息

关键词： Extended modules and rings Quillen-Suslin's methods Ore extensions

Alpine ecotone in the Siberian Mountains:vegetation response to warming

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 Mountain Science 2021年第12期18卷 3099-3108页

作者： KHARUK viacheslav I. IM Sergei T. PETROV Il’ya A. Sukachev Institute of Forest Federal Scientific CenterRussian Academy of ScienceSiberian BranchAcademgorodok 50/28Krasnoyarsk 660036Russia Siberian Federal University Svobodny str.79Krasnoyarsk 660041Russia Reshetnev Siberian State University of Science and Technology Krasnoyarsky rabochy str.31Krasnoyarsk 660014Russia

Birch(Betula tortuosa)is one of the treeline forming species within the Siberian *** analysed the area dynamics of birch stands and the upslope climb of birch treeline based on the Landsat time series scenes and on-ground *** found that since the warming onset(1970th)birch area increased by 10%,birch stands and treeline boundary were moving upslope with a rate of 1.4 m/yr and 4.0 m/*** upslope shift correlated with air temperatures at the beginning(May-June)and the end(August-October)of the growth ***,no correlation was found between birch upslope migration and *** negatively influenced both birch area growth and birch upslope climb during spring,fall,and *** the windy habitats,birch,together with larch and Siberian pine,formed clusters(hedges)which mitigated the influence of adverse *** clusters are the adaptive pattern for trees’upslope climb within windward *** other adaptation to the harsh alpine ecotone habitat is non-leaf(bark)photosynthesis which supports tree ***,Betula tortuosa upslope climb depends on the wind impact and warming in spring and fall that extended growth *** ongoing warming and observed wind speed decrease on the background of sufficient precipitation,it is expected to further birch advance into alpine tundra in the Siberian Mountains.

关键词： Alpine biomes Treeline shift rate Treeline ecotone Siberian mountain forests Betula tortuosa Forest densification Tree clustering

Effects of temperature on critical resolved shear stresses of slip and twining in Mg single crystal via experimental and crystal plasticity modeling

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2023年第6期11卷 2027-2041页

作者： Kwang Seon Shin Lifei Wang Mingzhe Bian Shihoon Choi Alexander Komissarov viacheslav Bazhenov Magnesium Technology Innovation Center Department of Materials Science and EngineeringSeoul National University1 Gwanak-roGwanak-guSeoul 08826Republic of Korea Laboratory of Medical Bioresorption and Bioresistance Moscow State University of Medicine and DentistryDelegatskaya 20/1Moscow127473 Russia Shanxi Key Laboratory of Advanced Magnesium-Based Materials College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China Departments of Advanced Components and Materials Engineering Sunchon National UniversitySuncheonJeonnam57922Republic of Korea Laboratory of Hybrid Nanostructured Materials National University of Science and Technology"MISiS"Leninskiy pr.4Moscow119049 Russia Casting Department National University of Science and Technology"MISiS"Leninskiy pr.4Moscow119049 Russia

Magnesium(Mg)single crystal specimens with three different orientations were prepared and tested from room temperature to 733 K in order to systematically evaluate effects of temperature on the critical resolved shear stress(CRSS)of slips and twinning in Mg single *** duplex non-basal slip took place in the temperature range from 613 to 733 K when the single crystal samples were stretched along the*** contrast,the single basal slip and prismatic slip were mainly activated in the temperature range from RT to 733 K when the tensile directions were inclined at an angle of 45°with the basal and the prismatic plane,*** self-consistent(VPSC)crystal modeling simulations with genetic algorithm code(GA-code)were carried out to obtain the best fitted CRSSs of major deformation modes,such as basal slip,prismatic slip,pyramidalⅡ,{1012}tensile twinning and{1011}compressive twinning when duplex slips accommodated ***,CRSSs of the basal and the prismatic slip were derived using the Schmid factor(SF)criterion when the single slip mainly accommodated *** the CRSSs of major deformation modes obtained by the VPSC simulations and the SF calculations,the CRSSs for basal slip and{1012}tensile twinning were found to show a weak temperature dependence,whereas those for prismatic,slip and{1011}compressive twinning exhibited a strong temperature *** the comparison of previous results,VPSC-GA modeling was proved to be an effective method to obtain the CRSSs of various deformation modes of Mg and its alloys.

关键词： Magnesium Single crystal Critical resolve shear stress Slip Twinning

Warming hiatus-and evergreen conifers in Altay-Sayan Region,Siberia

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2018年第12期15卷 2579-2589页

作者： viacheslav I.KHARUK Sergei T.IM Il'ya A.PETROV Sukachev Institute of Forest Federal Scientific CenterRussian Academy of ScienceSiberian BranchAcademgorodok 50/28Krasnoyarsk660036Russia Siberian Federal University Suobodny str.79Krasnoyarsk 660041Russia Reshetnev Siberian State University of Science and Technology Krasnoyarsky rabochy str.31Krasnoyarsk 660014Russia

"Warming hiatus" occurred in the AltaySayan Mountain Region, Siberia in c. 1997–2014. We analyzed evergreen conifer(EGC) stands area(satellite data) and trees(Siberian pine, Pinus sibirica Du Tour, Siberian fir, Abies sibirica Ledeb.) growth increment(dendrochronology data) response to climate variables before and during the hiatus. During the hiatus, EGC area increased in the highlands(>1000 m)(+30%), whereas at low and middle elevations(<1000 m. a.s.l.) the EGC area decreased(-7%). The EGC area increase was observed on the rain-ward northwest slopes mainly. In highlands, EGC area increase mainly correlated with summer air temperature, whereas at low and middle elevations EGC area decrease correlated with drought index SPEI and vapor pressure deficit(VPD). EGC mortality(fir and Siberian pine) in lowland was caused by the synergy of water stress(inciting factor) and barkbeetle attacks(contributing factor). Tree growth increment(GI) dynamics differs with respect to elevation. At high elevation(1700 m) GI permanently increased since warming onset, whereas at the middle(900 m) and low elevations(450 m) GI increased until c. 1983 yr. with followed depression. That GI "breakpoint" occurred about a decade before hiatus onset. In spite of growth depression, during hiatus GI was higher than that in pre-warming period. At high elevation, GI positively responded to elevated June temperatures and negatively to moisture increase(precipitation, root zone moisture content, VPD, and SPEI). At low elevation GI negatively responded to June temperatures and positively to moisture increase. For both, low and high elevation, these patterns persisted throughout the study period(1967–2014). On the contrary, at middle elevations GI dependence on climate variables switch after breakpoint year(1983). Before breakpoint, June air temperature(positive correlation) and moisture(negative correlations) controlled GI. Further temperature increase leads GI depression and switched correlation signs

关键词： Growth increment Warming hiatus Warming impact Conifer decline Tree growth Tree mortality Conifer mortality Water stress