检索结果-南通市图书馆

Model-based orbital-scale precipitation δ18O variations and distinct mechanisms in Asian monsoon and arid regions

在线全文

学校读者我要写书评

暂无评论

National Science Review 2022年第11期9卷 131-148页

作者： Xiaodong Liu Xiaoxun Xie Zhengtang Guo Zhi-Yong Yin guangshan chen State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences University of Chinese Academy of Sciences Institute of Geology and Geophysics Chinese Academy of Sciences Department of Environmental &Ocean Sciences University of San Diego

The past Asian precipitation δ18O(δ18Op) records from stalagmites and other deposits have shown significant orbital-scale variations, but their climatic implications and regional differences are still not fully understood. This study, as the first attempt of a 300-kyr transient stable isotope-enabled simulation,investigated the characteristics and mechanisms of the orbital-scale δ18Opvariations in three representative regions of Asia: arid Central Asia(CA), monsoonal South Asia(SA) and monsoonal East Asia(EA). The modelling results showed that the variations in the CA, SA and EA annual δ18Opexhibited significant but asynchronous 23-kyr precession cycles. Further analyses revealed that although the precession-induced insolation variation was the ultimate cause of the δ18Opvariation in all three regions, the dominant mechanisms and the involved physical processes were distinct among them. For the CA region, the rainy-season(November–March) temperature effect and water vapour transport by the westerly circulation were identified as the key precession-scale processes linking the October–February boreal mid-latitude insolation to the rainy-season or annual δ18Op. In the SA region, the rainy-season(June–September)precipitation amount effect and upstream depletion of the monsoonal water vapour δ18O served as the main mechanisms linking the rainy-season or annual δ18Opto the April–July insolation variation at the precession scale. For the EA region, however, the precession-scale annual δ18Opwas mainly controlled by the late-monsoon(August–September) and pre-monsoon(April–May) water vapour transport patterns,which were driven by the July–August insolation and the global ice volume, respectively. These results suggest that the climatic implications of the orbital-scale Asia δ18Opvariations are sensitive to their geographic locations as determined by the combined effects of insolation and regional circulation patterns associated with the respective rainy seasons. This study pr

关键词： orbital scale precipitation δ18O transient simulation Asian monsoon arid region

Three-Dimensional Impact Time and Angle Guidance via Controlling Line-of-Sight Dynamics

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Three-Dimensional Impact Time and Angle Guidance via Control...

Cubic Range Shaping Guidance for Maneuvering Targets with Impact Time Constraint

第32届中国控制与决策会议

作者： Tuo Han Yong Xi guangshan chen Qinglei Hu School of Automation Science and Electrical Engineering Beihang University Shanghai Aerospace Control Technology Institute Beijing Advanced Innovation Center for Big-Data Based Precision Medicine Beihang University

In this paper,a three-dimensional guidance law is developed for intercepting a maneuvering target with impact angle constraint at a specified impact *** achieve this goal,the LOS error dynamics is utilized to track a constant LOS signal and a quadratic LOS profile in the pitch and yaw planes,*** designated LOS profile in the yaw plane has a simple structure,i.e.,a quadratic polynomial in *** nullify the LOS tracking errors in finite time,the non-singular terminal sliding mode technique is utilized to obtain the guidance ***,a set of reliable LOS profiles are systematically determined to ensure the feasibility of the guidance *** proposed guidance law can guarantee the desired impact angles and zero miss distance as mandatory ***,a single tuning parameter provides an additional freedom to meet the desired impact ***,numerical results with various engagement scenarios are provided to validate effectiveness of the proposed guidance law.

关键词： Three-Dimensional Guidance Impact Time Impact Angle Line-of-Sight Shaping

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Cubic Range Shaping Guidance for Maneuvering Targets with Im...

Miu-Synthesis Controller Design of the Transverse and Lateral Channels for High Angle of Attack Air-to-Air Missile

第32届中国控制与决策会议

In this paper,a cubic range shaping guidance with impact time constraint is proposed for intercepting maneuvering *** meet the desired impact time,the range dynamics is employed to track the desired range profiles created via a cubic range shaping *** coefficients involved in the range profiles are partially solved with boundary ***,a robust impact time guidance law is constructed to ensure bounded range tracking errors and estimate the target maneuvers as well using inertial delay control and sliding mode *** implemented guidance law involves a single parameter that is limited in a compact region,thus making it easy to be ***,numerical simulations with various cases are conducted to verify the proposed guidance law.

关键词： Guidance Law Range Shaping Impact Time

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Miu-Synthesis Controller Design of the Transverse and Latera...

第30届中国控制与决策会议

作者： Liao Huannian Zhong Kewei Ye Saixian chen guangshan Xia Bin Shanghai Aerospace Control Technology Institute

The new generation air-to-air missile is supposed to provide high manoeuvrability. For this demand, the high angle of attack to flight is needed. Aiming at the problem of strong cross-couplings caused by high angle of attack, it’s difficult to satisfy the requirements of the robust stability and robust performance for the ordinary controller design of single channel. The paper takes advantage of multivariable design by Miu-Synthesis control. The method of transverse and lateral double channel design was adopted. And the Miu-Synthesis controller was computed. The effectiveness is validated by simulation comparison between the new method and the single channel classical control design method.

关键词： High Angle of Attack Strong Cross-Couplings Transverse and Lateral Double Channel Design Miu-Synthesis Control

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

物流MIS中的信息技术研究

电脑学习 2008年第4期 6-7页

作者：陈广山辽宁对外经贸学院副教授大连116052

论述了物流系统中的信息技术。

关键词：物流信息技术数据挖掘 GIS GPS

在线全文

学校读者我要写书评

暂无评论

IP层的安全机制研究

电脑开发与应用 2008年第9期21卷 52-54页

作者：陈广山辽宁对外经贸学院信息技术系大连116052

IP层在TCP/IP体系结构中具有非常重要的意义,但由于其设计中的"友好"性导致其安全问题也非常明显。对IP层的安全问题进行了分析,并对其安全体系结构IPSec的原理进行了研究,主要介绍了其体系结构的模型、安全协议、安全策略和安全通信机... 详细信息

IP层在TCP/IP体系结构中具有非常重要的意义,但由于其设计中的"友好"性导致其安全问题也非常明显。对IP层的安全问题进行了分析,并对其安全体系结构IPSec的原理进行了研究,主要介绍了其体系结构的模型、安全协议、安全策略和安全通信机制等问题。

关键词： IPSec 安全体系结构 SA IKE

在线全文

学校读者我要写书评

暂无评论

现代职业教育资源市场化的保障机制研究

计算机时代 2015年第4期 75-76页

作者：陈广山辽宁对外经贸学院辽宁大连116052

国务院发布的开展现代职业教育的文件,为大多数地方本科高校开展现代职业教育,培养技术/技能型人才进行了明确的定位。然而,现代职业教育的开展需要大量教育资源特别是实践资源的支撑。针对如何解决现代职业教育资源不足的问题,提出了... 详细信息

国务院发布的开展现代职业教育的文件,为大多数地方本科高校开展现代职业教育,培养技术/技能型人才进行了明确的定位。然而,现代职业教育的开展需要大量教育资源特别是实践资源的支撑。针对如何解决现代职业教育资源不足的问题,提出了教育资源市场化的策略,并从学校、企业、教育行政管理部门的角度研究了建立教育资源市场化保障机制的方法,以确保现代职业教育有效、务实地开展。

关键词：现代职业教育教育资源市场化技术技能型人才保障机制

在线全文

学校读者我要写书评

暂无评论

基于WPF的UI设计模式研究

鸡西大学学报（综合版） 2016年第8期16卷 32-35页

作者：陈广山辽宁对外经贸学院辽宁大连116052

在使用编程语言设计UI的模式中,UI与数据的交互采用的是事件驱动的消息处理机制,数据与UI耦合度高,不利于UI的设计与软件的后期维护。基于WPF的UI设计对传统模式进行了改进,在事件驱动的基础上引入了数据驱动的理念,让数据重归核心地位... 详细信息

在使用编程语言设计UI的模式中,UI与数据的交互采用的是事件驱动的消息处理机制,数据与UI耦合度高,不利于UI的设计与软件的后期维护。基于WPF的UI设计对传统模式进行了改进,在事件驱动的基础上引入了数据驱动的理念,让数据重归核心地位。MVVM是基于WPF技术的开发模式,它利用XMAL和Data Binding技术,使代码和UI得到很好的分离,既有益于UI设计者与程序员的合作,又增加了用户的体验。

关键词： UI WPF MVVM 数据驱动绑定

在线全文

学校读者我要写书评

暂无评论

基于“角色”的民办高校课程建设研究

计算机时代 2014年第3期 62-63页

作者：陈广山辽宁对外经贸学院信息管理系高等教育研究室辽宁大连116052

课程建设的理论应该与其专业人才培养的目标相匹配,定位于应用型人才培养的民办高校应该以"就业为导向"开展务实的专业教育,其课程建设应该为学生未来职业角色的扮演服务。把角色理论应用于民办高校的课程建设,目的是通过"角色课堂"中... 详细信息

课程建设的理论应该与其专业人才培养的目标相匹配,定位于应用型人才培养的民办高校应该以"就业为导向"开展务实的专业教育,其课程建设应该为学生未来职业角色的扮演服务。把角色理论应用于民办高校的课程建设,目的是通过"角色课堂"中的角色扮演缩小角色期望与角色现实间的距离,培养学生的职业技能。实践证明,基于角色的课程理论能够深化学生对于职业角色的认识,有利于学生未来职业的发展。

关键词：角色职业民办高校课程建设应用