检索结果-南通市图书馆

Multifunctional protective aerogel with superelasticity over−196 to 500℃

Nano Research 2022年第9期15卷 7797-7805页

作者： bo-Wen Liu Min Cao Yi-Ying Zhang Yu-Zhong Wang Hai-bo zhao The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials(MoE) National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan)State Key Laboratory of Polymer Materials EngineeringCollege of ChemistrySichuan UniversityChengdu 610064China

Protective materials that possess superelasticity and multifunctionality over a broad temperature range are urgently needed in various advanced ***,under harsh work conditions,the performance of current materials may largely deteriorate to lose protective ***,we report a bidirectionally oriented multi-walled carbon nanotubes(MWCNTs)-reinforced chitosan carbon aerogel(CS-MWCNT)that possesses superelasticity,high electromagnetic interference shielding,thermal insulation,and infrared stealth at both low temperatures(such as liquid nitrogen)and high temperatures(such as alcohol flames).Highly oriented lamellar arch structures combined with an MWCNTs-reinforced carbon skeleton act as elastic segments to disperse the stress during compression and endow CS-MWCNT with the ability to recover to almost the original size after being compressed at−196-500℃.The lamellar structures make CS-MWCNT thermally insulating and infrared stealth with a low thermal conductivity of~0.03 W/(m·K).Furthermore,a high electromagnetic interference(EMI)shielding effect of 64 dB is realized via an absorption-dominant EMI shielding mechanism derived from the successive inherently conductive carbon lamella,and the EMI shielding performance is largely maintained after treatment under extreme conditions like low temperature,high temperature,as well as cyclic *** work provides a new strategy for the development of temperature-invariant multifunctional aerogels for harsh environment applications.

关键词： superelasticity electromagnetic interference shielding heat insulation infrared stealth extreme environment

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Survey: Typical Security Issues of Software-Defined Networking

引用

China Communications 2019年第7期16卷 13-31页

作者： Yifan Liu bo zhao Pengyuan zhao Peiru Fan Hui Liu Key Laboratory of Aerospace Information Security and Trusted Computing Ministry of Education School of Cyber Science and Engineering Wuhan University Wuhan 430072 China School of Cyber Security and Computer Hebei University Baoding 071002 China

Software-Defined Networking (SDN) has been a hot topic for future network development, which implements the different layers of control plane and data plane respectively. Despite providing high openness and programmability, the “three-layer two-interface” architecture of SDN changes the traditional network and increases the network attack nodes, which results in new security issues. In this paper, we firstly introduced the background, architecture and working process of SDN. Secondly, we summarized and analyzed the typical security issues from north to south: application layer, northbound interface, control layer, southbound interface and data layer. Another contribution is to review and analyze the existing solutions and latest research progress of each layer, mainly including: authorized authentication module, application isolation, DoS/DDoS defense, multi-controller deployment and flow rule consistency detection. Finally, a conclusion about the future works of SDN security and an idealized global security architecture is proposed.

关键词： software-defined networking network security global security security threat

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

DPTSV:A Dynamic Priority Task Scheduling Strategy for TSS Deadlock Based on Value Evaluation

引用

China Communications 2016年第1期13卷 161-175页

作者： zhao bo XIANG Shuang AN Yang TAO Wei School of Computer Science Wuhan University Key laboratory of Aerospace Information Security and Trusted Computing Wuhan University Ministry of Education

This paper analyzes the threat of TCG Software Stack(TSS)/TCM Service Module(TSM) deadlock in multi-user environment such as cloud and discusses its causes and *** addition,this paper puts forward a dynamic priority task scheduling strategy based on value evaluation to handle this *** strategy is based on the implementation features of trusted hardware and establishes a multi-level ready *** this strategy,an algorithm for real-time value computing is also designed,and it can adjust the production curves of the real time value by setting parameters in different environment,thus enhancing its adaptability,which is followed by scheduling and algorithm *** paper also implements the algorithm and carries out its performance *** to the experiment result from Intel NUC,it is shown that TSS based on advanced DPTSV is able to solve the problem of deadlock with no negative influence on performance and security in multi-user environment.

关键词： TCG software stack/TCM service module deadlock multi-user trusted platform module real-time value

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Dynamic Measurement Protocol in Infrastructure as a Service

引用

Tsinghua Science and Technology 2014年第5期19卷 470-477页

作者： Shuang Xiang bo zhao An Yang Tao Wei School of Computer Wuhan University

Infrastructure as a Service （laaS） has brought advantages to users because virtualization technology hides the details of the physical resources, but this leads to the problem of users being unable to perceive their security. This defect has obstructed cloud computing from wide-spread popularity and development. To solve this problem, a dynamic measurement protocol in laaS is presented in this paper. The protocol makes it possible for the user to get the real-time security status of the resources, thereby solving the problem of guaranteeing dynamic credibility. This changes the cloud service security provider from the operator to the users themselves. This study has verified the security of the protocol by means of Burrow-Abadi-Needham （BAN） logic, and the result shows that it can satisfy requirements for innovation, privacy, and integrity. Finally, based on different laaS platforms, this study has conducted a performance analysis to demonstrate that this protocol is reliable, secure, and efficient.

关键词： Burrow-Abadi-Needham (BAN) logic real-time security trusted dynamic measurement

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

DATA CONTEXT MODEL IN THE PRO-CESS INTEGRATION FRAMEWORK

引用

Chinese Journal of Mechanical Engineering 2008年第2期21卷 104-107页

作者： zhao bo YAN Yan NING Ruxin LI Shiyun School of Mechanical and Vehicular Engineering Beijing Institute of Technology Beijing 100081 China Shanghai Hudong-zhonghua Shipbuilding （group） Co. Shanghai 200129 China

Process integration is the important aspect of product development process. The recent researches focus on project management, workflow management and process modeling. Based on the analysis of the process, product development process is divided into three levels according to different grains from macroscopy to microcosm. Our research concentrate on the workflow and the free-grained design process. According to the need of representing the data and the relationships among them for process integration, context model is introduced, and its characters are analyzed. The tree-like structure of inheritance among context model＇s classes is illustrated; The relationships of reference among them are also explained. Then, extensible markup language （XML） file is used to depict these classes. A four-tier framework of process integration has been established, in which model-view-controller pattern is designed to realize the separation between context model and its various views. The integration of applications is applied by the encapsulation of enterprise＇s business logic as distributed services. The prototype system for the design of air filter is applied in an institute.

关键词： Context model Process integration Extensible markup language(XML) Model-view-controller(MVC) Service

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Study on the early warning mechanism for the security of blast furnace hearths

引用

International Journal of Minerals,Metallurgy and Materials 2013年第4期20卷 345-353页

作者： Hong-bo zhao Shou-feng Huo Shu-sen Cheng State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing North Billion Technology Co. LTD.

The campaign life of blast furnace （BF） hearths has become the limiting factor for safety and high efficiency production of modern BFs. However, the early warning mechanism of hearth security has not been clear. In this article, based on heat transfer calculations, heat flux and erosion monitoring, the features of heat flux and erosion were analyzed and compared among different types of hearths. The primary detecting elements, mathematical models, evaluating standards, and warning methods were discussed. A novel early warning mechanism with the three-level quantificational standards was proposed for BF hearth security.

关键词： blast furnaces hearths erosion heat flux warning

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Porous carbon/Fe composites from waste fabric for high-efficiency electromagnetic wave absorption

引用

Journal of Materials Science & Technology 2022年第31期126卷 266-274页

作者： Jin-bo Cheng Hai-bo zhao Ai-Ning Zhang Yan-Qin Wang Yu-Zhong Wang Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials(MoE) State Key Laboratory of Polymer Materials EngineeringNational Engineering Laboratory for Eco-Friendly Polymer Materials(Sichuan)College of ChemistrySichuan UniversityChengdu 610064China

Nowadays,a large amount of waste fabrics has brought huge environmental and resource problems,while the traditional recycling routes are downcycling with low efficiency and complex separation ***,we demonstrate a green and facile route to up-recycle waste fabrics(cotton-polyester blending or cotton fabrics)into a high-performance microwave *** this design,an assistant coating was deposited onto the fiber surface of the waste fabric through the assembly of tannic acid-Fe^(2+)(TA-Fe^(2+)),which effectively catalyzed the polymer fiber into highly graphitized porous carbon fiber at high ***,the Fe nanoparticles from the reduction of Fe^(2+)ions were evenly embedded on the surface of porous carbon ***,the resultant porous carbon/Fe composites with hierarchi-cal microstructures displayed excellent microwave absorption ***,the microwave ab-sorber from waste polyester-cotton blended fabric could reach a minimum reflection loss(RL)of-50.5 dB at a thin coating thickness of 1.7 mm,and the minimum RL from waste cotton fabric absorber reached-47.1 dB at a thickness of 2.5 *** work provides a new idea to convert waste fabrics into high value-added microwave absorbing materials in a simple and environmentally friendly way,which will help reuse resources and protect the environment.

关键词： Up recycling Microwave absorption Waste fabrics Thin thickness

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A characteristic modeling method of error-free compression for nonlinear systems

引用

Control Theory and Technology 2021年第3期19卷 375-383页

作者： Bin Meng Yun-bo zhao Jing-Jing Mu Science and Technology on Space Intelligent Control Laboratory Beijing Institute of Control EngineeringBeijingChina Department of Automation University of Science and Technology of ChinaBeijingChina China Aerospace Science and Technology Corporation BeijingChina

The existence of error when compressing nonlinear functions into the coefficients of the characteristic model is known to be a key issue in existing characteristic modeling approaches,which is solved in this work by an error-free compression *** first define a key concept of relevant states with corresponding compressing methods into their coefficients,where the coefficients are continuous and bounded and the compression is ***,we give the conditions for decoupling characteristic modeling for MIMO systems,and sequentially,we establish characteristic models for nonlinear systems with minimum phase and relative order two as well as the flexible spacecrafts,realizing the equivalence in the characteristic model ***,we explicitly explain the reasons for normalization in the characteristic model theory.

关键词： Characteristic modeling Relevant states Error-free compression Flexible spacecraft Normalization

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

On-chip boost regulator with projected off- and on-time control

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第8期10卷 1223-1230页

作者： Xiao-ru XU Meng-lian zhao Xiao-bo WU Institute of VLSI Design Zhejiang University Hangzhou 310027 China

The boost type power supplies are widely used in portable consumer electronics to step up the input voltage to adapt for the high voltage applications like light-emitting diode(LED) driving and liquid crystal display(LCD) *** these applications,a regulator with small volume,fewer external components and high efficiency is highly *** paper proposes a projected off-and on-time boost control scheme,based on which a monolithic IC with an on-chip VDMOS with 0.2 Ω on-state resistance RDS-ON was implemented in 1.5 μm bipolar-CMOS-DMOS(BCD) process.A 12 V,0.3 A boost regulator prototype is presented as *** projected off-time and modulated on-time in continuous conduction mode(CCM),a quasi fixed frequency,which is preferred for ripple control,is *** projected on-time and modulated off-time in discontinuous conduction mode(DCM),pulse frequency modulation(PFM) operation,which is beneficial to light load efficiency improvement,is achieved without extra control *** results show that an efficiency of 3% higher than that of a conventional method under 0.5 W output is achieved while a step load transient response comparable to that of current mode control is maintained as well.

关键词： boost regulator Integrated circuits Pulse frequency modulation Projected off-time Projected on-time

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Hollow MOF capsule encapsulated amino-functionalized ionic liquid for excellent CO_(2) catalytic conversion

引用

Chinese Journal of Chemical Engineering 2021年第12期34卷 124-130页

作者： bo-Yun Liu Min-Jie Chen Liang Yang bo zhao Tao Xia Gang-Gang Chang School of Power Engineering Naval University of EngineeringWuhan 430033China School of Chemistry Chemical Engineering and Life ScienceWuhan University of TechnologyWuhan 430070China

The engineering of highly efficient and stable heterogeneous catalysts for catalytic conversion of CO_(2) to high value-added products is highly desirable but presents a great challenge. Herein, we reported the synthesis of a series of multifunctional IL@H-Zn/Co-ZIF composite catalysts with a unique porous hollow capsule structure and encapsulated amino-functionalized ionic liquids(ILs). The unique hollow capsule structure of IL@H-Zn/Co-ZIF provides sufficient space for loading active ILs([C_(2)NH_(2) Mim+][Brà]) and fast mass transfer of substrate molecules during catalysis. Furthermore, the microporous Zn-ZIF shell can effectively avoid the leaching of active ILs. Benefiting from the unique hollow structure, the resultant IL@H-Zn/Co-ZIF demonstrated excellent catalytic performance(>95% yield), and good recyclability(still remained about 90% activities after 5 cycles) when applied in the CO_(2) cycloaddition reaction under solvent and co-catalyst free conditions.

关键词： MOFs Catalyst Hollow capsule CO_(2)capture Ionic liquids

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：