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期刊论文 7

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2021 1

2018 1

2016 3

2007 2

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准静态强度 1

机械连接 1

疲劳 1

自冲摩擦铆焊 1

自冲铆接 1

软件定义网络;网络功能虚拟化;量子遗传算法;网络中间件 1

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Solution properties and self-association of multi-blocks like copolymer P(AM/AA) prepared by template

ZHANG Yuxi, WU Feipeng, LI Miaozhen, WANG Erjian

《化学科学与工程前沿(英文)》 2007年 第1卷 第1期   页码 68-71 doi: 10.1007/s11705-007-0014-8

摘要: The association and properties of multi-block like copolymers (TP) of acrylamide (AM) and acrylic acid (AA) prepared by template copolymerization in aqueous solution were studied. The results showed that the copolymers of this type exhibited a significant structure effect compared with that of similar random copolymers (CP) obtained by copolymerization in the absence of template. Decreasing the value of pH or adding Ca ion to the copolymer solution will make phase separation occur. The TEM images demonstrated that the phase separation caused by Ca ion was due to the formation of extensively intermolecular cross-linking. With the increase of the pH value of copolymer solution, the changes of the solution viscosity was similar with that of homopolyacrylic acid, which originally increased and then decreased. But the increase range of template copolymer was higher than that of homopolyacrylic acid. TEM images indicated that at the maximal viscosity the copolymer obtained in the presence of template formed coiled aggregates.

关键词: aqueous solution     homopolyacrylic     copolymer solution     significant structure     presence    

Metabolic flux analysis on arachidonic acid fermentation

JIN Mingjie, HUANG He, ZHANG Kun, YAN Jie, GAO Zhen

《化学科学与工程前沿(英文)》 2007年 第1卷 第4期   页码 421-426 doi: 10.1007/s11705-007-0077-6

摘要: The analysis of flux distributions in metabolic networks has become an important approach for understanding the fermentation characteristics of the process. A model of metabolic flux analysis of arachidonic acid (AA) synthesis in ME-1 was established and carbon flux distributions were estimated in different fermentation phases with different concentrations of N-source. During the exponential, decelerating and stationary phase, carbon fluxes to AA were 3.28%, 8.80% and 6.97%, respectively, with sufficient N-source broth based on the flux of glucose uptake, and those were increased to 3.95%, 19.21% and 39.29%, respectively, by regulating the shifts of carbon fluxes via fermentation with limited N-source broth and adding 0.05% NaNO at 96 h. Eventually AA yield was increased from 1.3 to 3.5 g · L. These results suggest a way to improve AA fermentation, that is, fermentation with limited N-source broth and adding low concentration N-source during the stationary phase.

关键词: AA     different fermentation     concentration N-source     exponential     metabolic    

Metal cation removal by P(VC-r-AA) copolymer ultrafiltration membranes

Nachuan Wang, Jun Wang, Peng Zhang, Wenbin Wang, Chuangchao Sun, Ling Xiao, Chen Chen, Bin Zhao, Qingran Kong, Baoku Zhu

《化学科学与工程前沿(英文)》 2018年 第12卷 第2期   页码 262-272 doi: 10.1007/s11705-017-1682-7

摘要: A series of amphiphilic copolymers containing poly(vinyl chloride-r-acrylic acid) (P(VC-r-AA) ) was synthesized and used to prepare membranes via a non-solvent induced phase separation method. The prepared membranes were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, and water contact angle and zeta potential measurements. The copolymer P(VC-r-AA) chains did not dissolved in a coagulation bath, indicating that the AA segments were completely retained within the membrane. Enriching degree of AA segments in surface layer was 2 for copolymer membrane. In addition, the introduction of AA segments made the membrane electronegative and hydrophilic so that the membrane was sensitive to the solution pH. The fouling resistance, adsorption of Cu(II), Cr(III) and Ce(IV) ions and the desorption properties of the membranes were also determined. The copolymer membranes exhibited good antifouling performance with a fouling reversibility of 92%. The membranes also had good adsorption capacities for Cu(II), Cr(III) and Ce(IV) ions. The optimal pH for Cu(II) adsorption was 6 and the copolymer membrane has potential applications for low concentration Cu(II) removal.

关键词: poly(vinyl chloride-r-acrylic acid)     negatively charged PVC membrane     anti-fouling     heavy metal adsorption     Cu(II) removal    

铝合金AA5182-O自冲摩擦铆焊与自冲铆接工艺比较研究 Article

马运五, 山河, 牛嗣哲, 李永兵, 林忠钦, Ninshu Ma

《工程(英文)》 2021年 第7卷 第12期   页码 1741-1750 doi: 10.1016/j.eng.2020.06.015

摘要:

本文分别采用自冲铆接(SPR)和自冲摩擦铆焊(F-SPR)工艺连接铝合金AA5182-O。

关键词: 自冲铆接     自冲摩擦铆焊     机械连接     准静态强度     疲劳    

一种基于改进量子遗传算法的虚拟服务部署方法 Article

Gang XIONG,Yu-xiang HU,Le TIAN,Ju-long LAN,Jun-fei LI,Qiao ZHOU

《信息与电子工程前沿(英文)》 2016年 第17卷 第7期   页码 661-671 doi: 10.1631/FITEE.1500494

摘要: 现有网络中间件设备在引入新的网络功能中发挥了重要作用,但是,由于传统硬件化的中间件设备缺乏服务的灵活性和扩展性,因此中间件的管理和创新也一直是网络运营商面临的严峻挑战。近年来,新的网络技术(如网络功能虚拟化(NFV)和软件定义网络(SDN))为设计廉价高效的中间件服务体系结构提供了有效途径,然而,对如何在业务流量接受附加虚拟服务的情况下保证网络传输效率,业界关注仍较少。因此,为了降低网络传输延迟,本文针对在NFV和SDN环境中的服务部署问题展开研究。首先,本文设计了一个服务部署决策框架,并提出基于整数线性规划的服务部署模型以达到降低网络传输延迟的目的。其次,基于改进的量子遗传算法设计了一个启发式方案,从而有效求解服务部署的优化模型。最后,实验结果表明,本文所提方法可以自动计算得到优化的服务部署方案。与对比方法相比,本文方法可以实现更低的网络整体传输延迟,其中较之随机部署策略可平均降低30%的流量传输时延。

关键词: 软件定义网络;网络功能虚拟化;量子遗传算法;网络中间件    

security Project supported by the National Basic Research Program (863) of China (No. 2015AA05002

Yi-nan WANG,Zhi-yun LIN,Xiao LIANG,Wen-yuan XU,Qiang YANG,Gang-feng YAN

《信息与电子工程前沿(英文)》 2016年 第17卷 第5期   页码 465-478 doi: 10.1631/FITEE.1500446

摘要: This paper establishes a new framework for modeling electrical cyber-physical systems (ECPSs), integrating both power grids and communication networks. To model the communication network associated with a power transmission grid, we use a mesh network that considers the features of power transmission grids such as high-voltage levels, long-transmission distances, and equal importance of each node. Moreover, bidirectional links including data uploading channels and command downloading channels are assumed to connect every node in the communication network and a corresponding physical node in the transmission grid. Based on this model, the fragility of an ECPS is analyzed under various cyber attacks including denial-of-service (DoS) attacks, replay attacks, and false data injection attacks. Control strategies such as load shedding and relay protection are also verified using this model against these attacks.

关键词: Cyber-physical systems     Cyber attacks     Cascading failure analysis     Smart grid    

mobile robot Project supported by the National High-Tech R&D Program (863) of China (No. 2009AA04Z220

Feng-yu ZHOU,Xian-feng YUAN,Yang YANG,Zhi-fei JIANG,Chen-lei ZHOU

《信息与电子工程前沿(英文)》 2016年 第17卷 第4期   页码 365-374 doi: 10.1631/FITEE.1500272

摘要: To overcome the shortcomings of existing robot localization sensors, such as low accuracy and poor robustness, a high precision visual localization system based on infrared-reflective artificial markers is designed and illustrated in detail in this paper. First, the hardware system of the localization sensor is developed. Secondly, we design a novel kind of infrared-reflective artificial marker whose characteristics can be extracted by the acquisition and processing of the infrared image. In addition, a confidence calculation method for marker identification is proposed to obtain the probabilistic localization results. Finally, the autonomous localization of the robot is achieved by calculating the relative pose relation between the robot and the artificial marker based on the perspective-3-point (P3P) visual localization algorithm. Numerous experiments and practical applications show that the designed localization sensor system is immune to the interferences of the illumination and observation angle changes. The precision of the sensor is ±1.94 cm for position localization and ±1.64? for angle localization. Therefore, it satisfies perfectly the requirements of localization precision for an indoor mobile robot.

关键词: Mobile robot     Localization sensor     Visual localization     Infrared-reflective marker     Embedded system    

标题 作者 时间 类型 操作

Solution properties and self-association of multi-blocks like copolymer P(AM/AA) prepared by template

ZHANG Yuxi, WU Feipeng, LI Miaozhen, WANG Erjian

期刊论文

Metabolic flux analysis on arachidonic acid fermentation

JIN Mingjie, HUANG He, ZHANG Kun, YAN Jie, GAO Zhen

期刊论文

Metal cation removal by P(VC-r-AA) copolymer ultrafiltration membranes

Nachuan Wang, Jun Wang, Peng Zhang, Wenbin Wang, Chuangchao Sun, Ling Xiao, Chen Chen, Bin Zhao, Qingran Kong, Baoku Zhu

期刊论文

铝合金AA5182-O自冲摩擦铆焊与自冲铆接工艺比较研究

马运五, 山河, 牛嗣哲, 李永兵, 林忠钦, Ninshu Ma

期刊论文

一种基于改进量子遗传算法的虚拟服务部署方法

Gang XIONG,Yu-xiang HU,Le TIAN,Ju-long LAN,Jun-fei LI,Qiao ZHOU

期刊论文

security Project supported by the National Basic Research Program (863) of China (No. 2015AA05002

Yi-nan WANG,Zhi-yun LIN,Xiao LIANG,Wen-yuan XU,Qiang YANG,Gang-feng YAN

期刊论文

mobile robot Project supported by the National High-Tech R&D Program (863) of China (No. 2009AA04Z220

Feng-yu ZHOU,Xian-feng YUAN,Yang YANG,Zhi-fei JIANG,Chen-lei ZHOU

期刊论文