检索结果-南通市图书馆

Complex Polynomial Vector Fields Having a Finitely Curved Orbit

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2007年第12期23卷 2247-2252页

作者： B.scDUA Instituto de Matemática C.P.68530Universidade Federal do Rio de Janeiro

The author proves that a non-singular polynomial vector field without invariant lines and having an entire finitely curved transcendent orbit on C^2 must be equivalent to a trivial vector field by a holomorphic change of coordinates. Other classification results are obtained for polynomial vector fields having a finitely curved orbit on C^2.

关键词： holomorphic foliation minimal immersion Huber-Osserman theorem

DIscRETIZATION OF JUMP STOCHASTIC DIFFERENTIAL EQUATIONS IN TERMS OF MULTIPLE STOCHASTIC INTEGRALS

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 1998年第4期16卷 375-384页

作者： Li, CW Wu, sc Liu, XQ City Univ Hong Kong Dept Math Hong Kong Hong Kong Acad Sinica Inst Appl Math Beijing 100080 Peoples R China Acad Sinica Lab Management Decis & Informat Syst Beijing 100080 Peoples R China

In the Stratonovich-Taylor and Stratonovich-Taylor-Hall discretization schemes for stochastic differential equations (SDEs), there appear two types of multiple stochastic integrals respectively. The present work is to approximate these multiple stochastic integrals by converting them into systems of simple SDEs and solving the systems by lower order numerical schemes. The reliability of this approach is clarified in theory and demonstrated in numerical examples. In consequence, the results are applied to the strong discretization of both continuous and jump SDEs.

关键词： Brownian motion Poisson process stochastic differential equation multiple stochastic integral strong discretization

The isotopic abundance and atomic weight of natural uranium

在线全文

学校读者我要写书评

暂无评论

Chinese science Bulletin 1997年第10期42卷 814-817页

作者： Liu, YF Fu, sc China Institute of Atomic Energy Beijing China

THERE are three radioactive nuclides of uranium in nature,234U,235U and 238*** isotopicabundance and atomic weight of unanium was reported *** 1983,the International U-nion of Pure and Applied Chemistry（IUPAC）gave a review of the published *** resultsof the review showed the abundance of uraniums,234U:0.000 055（5）;235U:0.007 200（12）;238U:0.992 745（60）,the atomic weight of uranium,A,（U）=238.028 9（1）.

关键词： isotopic abundance of uranium atomic weight of uranium mass spectrometric measurement.

THREE DIMENSIONAL DYNAMIC ELASTICPLASTIC ANALYSIS OF THE INTERACTION OF A SET OF PERCUSSION BITS WITH ROCK MASSES

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 1995年第4期8卷 364-374页

作者： Song, sc Knasmillner, RE INNER MANGOLIA RES INST MET POB 4BAOTOU 014034PEOPLES R CHINA VIENNA TECH UNIV INST MECHA-1040 VIENNAAUSTRIA

A three dimensional dynamic elastic-plastic finite element analysis of the interaction of percussion bits with rock masses is presented. The dynamic contact problem was investigated with the numerical method developed for high velocity impact calculations[1]. The numerical analysis was carried out for three simultaneously loaded percussion bits arranged on a straight line on the rock surface, the loading time was kept constant throughout this work. The numerical calculation for various strengths of the dynamic load tm the percussion bits shows that a critical minimum dynamic load exists for the generation of plastic deformations in the rock. For this critical value of the load the maximum normal stress of the longitudinal wave in the percussion bit exceeds the yield stress of the rock mass.

关键词： rock masses percussion bits numerical analysis

《人工智能预训练模型第1部分:通用要求》等8项国家标准编制启动

在线全文

学校读者我要写书评

暂无评论

信息技术与标准化 2024年第4期 7-7页

作者：人工智能标准化sc42公众号

3月25—27日,由中国电子技术标准化研究院主办的《人工智能预训练模型第1部分:通用要求》等8项国家标准编制启动会在北京成功召开。中国电子技术标准化研究院介绍了该国家标准的立项情况和现有研究基础。各单位专家围绕预训练模型、风... 详细信息

3月25—27日,由中国电子技术标准化研究院主办的《人工智能预训练模型第1部分:通用要求》等8项国家标准编制启动会在北京成功召开。中国电子技术标准化研究院介绍了该国家标准的立项情况和现有研究基础。各单位专家围绕预训练模型、风险管理。

关键词：人工智能风险管理通用要求国家标准立项情况电子技术标准化启动

异构人工智能加速器统一接口(AICL)标准正式启动实施试验验证单位持续征集中

在线全文

学校读者我要写书评

暂无评论

信息技术与标准化 2024年第3期 7-7页

作者：人工智能标准化sc42公众号

1月17日,新一代人工智能标准与应用工信部重点实验室学术委员会会议在北京成功召开。会上,凝聚人工智能计算产业共识《异构人工智能加速器统一接口AICL》课题通过评审。该课题将推动异构人工智能加速器互联互通,提升异构智算系统的集成... 详细信息

1月17日,新一代人工智能标准与应用工信部重点实验室学术委员会会议在北京成功召开。会上,凝聚人工智能计算产业共识《异构人工智能加速器统一接口AICL》课题通过评审。该课题将推动异构人工智能加速器互联互通,提升异构智算系统的集成部署效率,目前已取得显著成效。同时,T/CESA 1303—2023《人工智能异构人工智能加速器统一接口》AICL团体标准正式发布并启动实施,试验验证单位持续征集中。AICL(全称AI Computing Library,人工智能计算库),是基于《人工智能异构人工智能加速器统一接口》等国家标准的跨架构.

关键词：人工智能统一接口团体标准重点实验室异构 AIC 互联互通集成部署

之江同心·科学家+企业家圆桌会议暨灵巧手标准筹备会顺利召开

在线全文

学校读者我要写书评

暂无评论

信息技术与标准化 2024年第6期 7-7页

作者：人工智能标准化sc42公众号

为深入追踪灵巧手产业发展趋势,以标准推动企业形成发展合力,支撑产业高质量发展,全国信标委人工智能分委会人形机器人(具身智能)工作组联合组长单位上海人工智能研究院联合浙江省新昌县政府,于2024年5月30日举行“之江同心·科学家+企... 详细信息

为深入追踪灵巧手产业发展趋势,以标准推动企业形成发展合力,支撑产业高质量发展,全国信标委人工智能分委会人形机器人(具身智能)工作组联合组长单位上海人工智能研究院联合浙江省新昌县政府,于2024年5月30日举行“之江同心·科学家+企业家圆桌会议暨灵巧手标准筹备会”。来自高校及灵巧手企业的30余位专家参会。

关键词：组长单位产业发展趋势人工智能人形机器人灵巧手浙江省新昌县企业家支撑产业

Geographic variation in sexual selection and implications for speciation in the Barn Swallow

在线全文

学校读者我要写书评

暂无评论

Chinese Birds 2015年第1期5卷 30-42页

作者： Elizabeth sc scordato Rebecca J Safran Department of Ecology and Evolutionary Biology The University of Colorado

Barn Swallows(Hirundo rustica), a group of passerine birds comprised of six closely related subspecies, are well known throughout their nearly worldwide distribution, in part because of their close association with human settlements.A tractable species for both individual-based and population-level studies, Barn Swallows are a prominent model system in evolutionary, ecological, and behavioral research. Here we review work on sexual selection and population divergence in this species complex, focusing on comparative studies among populations and *** summarize variation in the targets of mate choice and in the information conveyed by sexually selected traits, and conclude that the benefits advertised by different traits may vary geographically. Finally, we consider the role of sexual selection as a driver of population divergence in this widespread and phenotypically variable species complex.

关键词： Barn Swallow Geographic variation Natural selection Sexual selection Speciation Tail streamers Ventral color

在线全文

学校读者我要写书评

暂无评论

全国信标委人工智能分委会会议周在杭州开幕

信息技术与标准化 2024年第5期 5-5页

作者：人工智能标准化sc42公众号

4月23日,全国信标委人工智能分委会(以下简称“分委会”)会议周开幕式在杭州召开。工信部科技司副司长甘小斌、浙江省经信厅副厅长何国强出席会议并讲话。中国工程院院士王国栋,工信部科技司三级调研员刘傲,国资委规划发展局副处长邢相... 详细信息

4月23日,全国信标委人工智能分委会(以下简称“分委会”)会议周开幕式在杭州召开。工信部科技司副司长甘小斌、浙江省经信厅副厅长何国强出席会议并讲话。中国工程院院士王国栋,工信部科技司三级调研员刘傲,国资委规划发展局副处长邢相烨,全国信标委人工智能分委会秘书长、中国电子技术标准化研究院信息技术研究中心主任董建等领导和专家参加本次会议。

关键词：信息技术研究中国工程院院士副厅长人工智能何国强国资委工信部调研员