检索结果-南通市图书馆

制造技术与机床 2015年第10期 153-156页

作者：孙兰芳南京汽车集团有限公司江苏南京210061

介绍了西门子840D数控系统的安全集成门锁功能及安全软件极限开关SE功能,以及与之相关的参数。在出现安全集成报警后,通过安全编程逻辑界面进行诊断及维修。

关键词：安全集成 SPL SE

在线全文

学校读者我要写书评

暂无评论

基于蜜蜂采蜜机理的云计算负载均衡策略

计算机应用研究 2016年第4期33卷 1179-1182,1198页

作者：孙兰芳张曦煌江南大学物联网工程学院江苏无锡214122

任务调度是云计算研究中的NP难优化问题,负载均衡问题是任务调度的热点研究内容之一。针对云计算环境中任务分配不够合理、用户服务质量低的问题,提出一种模拟蜜蜂采蜜机理的负载均衡策略。该策略模拟蜂群觅食行为,建立负载均衡模型,被... 详细信息

任务调度是云计算研究中的NP难优化问题,负载均衡问题是任务调度的热点研究内容之一。针对云计算环境中任务分配不够合理、用户服务质量低的问题,提出一种模拟蜜蜂采蜜机理的负载均衡策略。该策略模拟蜂群觅食行为,建立负载均衡模型,被迁移的任务作为侦察蜂更新虚拟机的负载信息,并采用贝叶斯分类算法对虚拟机负载状态进行分类,将任务从重负载虚拟机迁移至轻负载虚拟机,同时满足目标虚拟机中高优先级任务的数量最少,避免了大量任务被调度到同一性能较优的虚拟机上,能够有效减少任务等待时间。实验结果表明,基于蜜蜂采蜜机理的负载均衡策略与传统算法相比,减少了任务响应时间、完工时间和迁移次数,同时更好地满足了用户服务质量需求。

关键词：云计算负载均衡蜜蜂采蜜机理朴素贝叶斯用户服务质量

Divergent responses of runoff to climate change in the upper basins of the Third Pole dominated by westerlies and monsoon

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2024年第8期67卷 2592-2614页

作者： Qikai sun Fengge SU He sun State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100101China

The diverse climates,distribution of snow and glaciers,and geographic locations directly affect the runoff response to climate change in the upper basins of the Third *** present,a comprehensive analysis of runoff variations and their distinct responses to climate change in the westerlies-and monsoon-dominated upper basins is still *** study comprehensively analyzed annual runoff variations in westerlies-dominated basins(the upper basins of the Aksu(UAKS),Syr Darya(USRD),Yarkant(UYK),Hotan(UHT),Amu Darya(UAMD),and Indus(UI))and monsoon-dominated basins(the upper basins of the Yangtze(UYA),Yellow(UYE),Lancang(ULC),Nujiang(UNJ),and Yarlung Zangbo(UYZ))of the Third Pole from 1961 *** multi-source meteorological data and large-scale circulation factors,this study investigated the divergent responses of runoff in the upper basins to climate change,and explored the large-scale circulation mechanisms underlying runoff variations in these upper *** results showed that:(1)The annual runoff in the majority of upper basins(except for the UYE and UYZ)exhibited an increasing trend,and the annual runoff in the UAKS,UYK,and UI showed a significant increasing trend from1961 to *** annual runoff in the upper basins of the Third Pole changed abruptly from decreasing to increasing between the 1980s and 2000s,with the exception of the UYE.(2)The runoff in the monsoon-dominated upper basins has been controlled primarily by changes in precipitation over the past 55 *** contrast,the runoff in the westerlies-dominated upper basins exhibited three distinct long-term responses to climate change:temperature-dominated(UYK and UHT),precipitation-dominated(USRD and UAMD),and the combined influence of precipitation and temperature(UAKS and UI).Since the 1960s,the sensitivity of runoff to warm season temperature changes in the most westerlies-dominated upper basins has decreased,while the response of runoff to precipitation changes has intensified.(3)The stud

关键词： Upper basins of the Third Pole Climate change Westerlies and monsoon Runoff variations Large-scale circulation factors

New perspectives on deep carbon cycling

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2024年第8期67卷 2411-2422页

作者： Weidong sun Center of Deep Sea Research Key Laboratory of Ocean Observation and ForecastingInstitute of OceanologyChinese Academy of SciencesQingdao 266071China Laoshan Laboratory Qingdao 266237China University of Chinese Academy of Sciences Beijing 100049China

The proto-atmosphere serves as a crucial starting point for the carbon *** based on atmospheric data from Mars and Venus suggest that Earth's proto-atmosphere contained>110 bar of CO_(2)and>2.6 bar of *** protoatmosphere had over 1000 bar of water vapor during the magma ocean stage,assuming the proto-ocean had a volume of two oceans of *** this stage both water and carbon dioxide were in a supercritical state at the magma-atmosphere *** serpentinization reactions occurred due to rock-water interaction,producing abundant ***,nitrogen is reduced to ammonia,and carbon dioxide to methane,forming carbonate *** proto-atmosphere dominated by methane,ammonia,and hydrogen formed a significant amount of amino acids through *** process is essential not only to the origin of life,but also to the early carbon-nitrogen cycle on *** the Hadean eon,a large amount of CO_(2)was sequestered as carbonate and organic ***,it mainly entered the deep mantle through mantle overturn or *** the mantle transition zone,carbonate undergoes“Redox freezing”,where carbonate is reduced to diamond through oxidation of ferrous iron in the *** the lower mantle,Fe^(2+)undergoes disproportionation reactions,forming Fe^(3+)and metallic *** these,Fe^(3+)mainly resides in bridgmanite,thereby increasing the oxygen fugacity of the lower mantle,while metallic iron falls to the Earth's *** distribution of carbon in the mantle is crucial for deep carbon *** density curves of diamond and mantle peridotite melt intersect at the bottom of the mantle transition zone(about 660 km).This density crossover leads to the accumulation of diamond during the magma ocean *** materials such as subducting slabs enter the lower mantle,compensatory upwelling of lower mantle material *** enters the upper mantle,decomposes,releasing Fe^(3+)ions and oxidizes diamond

关键词： Carbon cycling Proto-atmosphere Amino acids Subduction initiation Passive margin subduction Atmospheric carbon dioxide

探究幼儿园课程游戏化背景下的自然角课程建设

在线全文

学校读者我要写书评

暂无评论

当代家庭教育 2021年第12期 59-60页

作者：孙兰芳江苏省扬州市江都区大桥镇中心幼儿园

本文主要从探究幼儿园课程游戏化背景下的自然角课程建设出发,并结合当下幼儿园的自然角课程开展进行阐述说明,并且根据幼儿身心的特点、学习特征合理的创建游戏化为背景的自然角课程,从而有效的激发幼儿对课程学习的兴趣,积极的参与到... 详细信息

本文主要从探究幼儿园课程游戏化背景下的自然角课程建设出发,并结合当下幼儿园的自然角课程开展进行阐述说明,并且根据幼儿身心的特点、学习特征合理的创建游戏化为背景的自然角课程,从而有效的激发幼儿对课程学习的兴趣,积极的参与到活动当中,并且实现在玩中学习的教学目的。

关键词：幼儿园游戏化模式自然角开展试试分析

在线全文

学校读者我要写书评

暂无评论

数控机床热变形测量补偿技术

科技风 2015年第13期 50-52页

作者：孙兰芳南京汽车集团有限公司江苏南京210061

本文根据数控机床的热变形特性,采用直接测量铣刀的长度变化,来进行热变形补偿,将补偿值写入到工件偏置坐标系中,实现了实时补偿的能力。

关键词：数控机床热变形补偿 NC程序

Fossil Equidae in the Linxia Basin with Biostratigraphic and Paleozoogeographic Significance

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2024年第1期98卷 1-9页

作者： sun Boyang Key Laboratory of Vertebrate Evolution and Human Origins of the Chinese Academy of Sciences Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of SciencesBeijing 100044China

The Linxia Basin is characterized by an abundance of Cenozoic sediments,that contain exceptionally rich fossil *** are abundant in the Linxia Basin,the fossil record of equids in this region including 16 species that represent 10 *** comparison to other classic late Cenozoic areas in China,the Linxia Basin stands out,because the fauna and chronological data accompanying Linxia equids render them remarkably useful for *** anchitheriines in the region,such as Anchitherium and Sinohippus,represent early equids that appeared in the late stages of the middle and late Miocene,*** the equines,most species of Chinese hipparions have been identified in the Linxia Basin and some species of the genera Hipparion and Hippotherium have FAD records for ***,Equus eisenmannae is one of the earliest known species of Equus in the Old World and is well-represented at the Longdan *** species with precise geohistorical distributions can serve as standards for high-resolution chronological units within this *** at the eastern margin of the Tibetan Plateau and subject to considerable uplift,the Linxia Basin has served as a biogeographic transition area for equids throughout the late Cenozoic.

关键词： Equidae Cenozoic biostratigraphy paleozoogeography Linxia Basin

Achieving simultaneously high conversion and high selectivity for light olefins directly producing from syngas

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第3期67卷 753-754页

作者： Yuhan sun Shanxi Research Institute Huairou Research LaboratoryTaiyuan 030032China Institute of Carbon Neutrality ShanghaiTech UniversityShanghai 201210China

The activity and selectivity are two primary indexes of a successful catalyst for chemical reactions. However,achieving a high activity and a high selectivity simultaneously is a long-standing challenge in catalysis, the socalled activity-selectivity trade-off. In the article recently published in Science, a research team led by Prof.

关键词： selectivity simultaneous catalysis

在线全文

学校读者我要写书评

暂无评论

聚乙烯醇水溶性薄膜生产工艺研究

农业工程学报 2008年第7期24卷 247-250页

作者：陈志周牟建楼王林迟建于志彬孙兰芳河北农业大学食品科技学院保定071001

聚乙烯醇水溶性薄膜可通过自然因素迅速降解,符合环保要求,是一种新型绿色包装材料。本试验以聚乙烯醇为主要原料,加入增强剂、增塑剂、乳化剂和脱膜剂,制成固含量为15.0%～18.0%的水溶性胶,在钢板上流延涂布成膜,经干燥后揭膜。通过单... 详细信息

聚乙烯醇水溶性薄膜可通过自然因素迅速降解,符合环保要求,是一种新型绿色包装材料。本试验以聚乙烯醇为主要原料,加入增强剂、增塑剂、乳化剂和脱膜剂,制成固含量为15.0%～18.0%的水溶性胶,在钢板上流延涂布成膜,经干燥后揭膜。通过单因素试验和正交试验对聚乙烯醇水溶性薄膜的制备材料、工艺条件进行了研究,结果表明:聚乙烯醇浓度为11.0%,可溶性淀粉1.0%,甘油4.0%,吐温80为1.0%,硅油0.8%。在80～90℃下干燥20min,可得到性能较好的水溶性薄膜。

关键词：聚乙烯醇水溶性薄膜成膜工艺

ONE-PARAMETER FINITE DIFFERENCE METHODS AND THEIR ACCELERATED SCHEMES FOR SPACE-FRACTIONAL SINE-GORDON EQUATIONS WITH DISTRIBUTED DELAY

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2024年第3期42卷 705-734页

作者： Tao sun Chengjian Zhang Haiwei sun School of Mathematics and Statistics Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong University of Science and TechnologyWuhan 430074China Department of Mathematics University of MacaoMacaoChina

This paper deals with numerical methods for solving one-dimensional(1D)and twodimensional(2D)initial-boundary value problems(IBVPs)of space-fractional sine-Gordon equations(SGEs)with distributed *** 1D problems,we construct a kind of oneparameter finite difference(OPFD)*** is shown that,under a suitable condition,the proposed method is convergent with second order accuracy both in time and *** implementation,the preconditioned conjugate gradient(PCG)method with the Strang circulant preconditioner is carried out to improve the computational efficiency of the OPFD *** 2D problems,we develop another kind of OPFD *** such a method,two classes of accelerated schemes are suggested,one is alternative direction implicit(ADI)scheme and the other is ADI-PCG *** particular,we prove that ADI scheme can arrive at second-order accuracy in time and *** some numerical experiments,the computational effectiveness and accuracy of the methods are further ***,for the suggested methods,a numerical comparison in computational efficiency is presented.

关键词： Fractional sine-Gordon equation with distributed delay One-parameter finite difference methods Convergence analysis ADI scheme PCG method