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Symmetric or asymmetric glide resistance to twinning disconnection?

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npj Computational Materials 2022年第1期8卷 1615-1621页

作者： Mingyu Gong Houyu Ma kunming yang Yue Liu Jian-Feng Nie Jian Wang State Key Lab of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240P.R.China Department of Materials Science and Engineering Monash UniversityClaytonVIC3800Australia Department of Mechanical&Materials Engineering University of Nebraska-LincolnLincolnNE68583USA

Successive gliding of twinning disconnections(TDs)creates three-dimensional twins in parent crystal and accommodates shear *** is generally recognized that TD is subject to the same Peierls stress as it glides forward or backward because of its dislocation character and the twofold rotation symmetry of the twin *** on atomistic simulations,we demonstrate that the glide of TDs may be subject to a symmetric or asymmetric resistance corresponding to step character,symmetric resistance for A/A type steps but asymmetric resistance for A/B type steps,where A and B represent crystallographic planes in twin and ***,we experimentally demonstrate that the asymmetric resistance results in asymmetric propagation and growth of twins in Mg alloys.

关键词： resistance deformation. steps

Simultaneously optimizing pore morphology and enhancing mechanical properties of Al-Si alloy composite foams by graphene nanosheets

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Journal of Materials Science & Technology 2022年第6期101卷 60-70页

作者： Weiting Li Xudong yang kunming yang Chunnian He Junwei Sha Chunsheng Shi Yunhui Mei Jiajun Li Naiqin Zhao Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and EngineeringTianjin UniversityTianjin 300350China Sino-European Institute of Aviation Engineering Civil Aviation University of ChinaTianjin 300300China Collaborative Innovation Center of Chemical Science and Engineering Tianjin UniversityTianjin 300350China Tianjin Key Laboratory of Advanced Joining Technology School of Materials Science and EngineeringTianjin UniversityTianjin 300350China

The integrity and regularity of pore morphology play an important role in determining the mechanical properties of the metallic foam *** conventional methods on refining pore morphology are mainly focused on the optimization of fabrication techniques,however,they are usually inconvenient and ***,incorporating nano reinforcement is considered to be a suitable way to fabricate metallic composite foams accompanied by optimized pore morphology and enhanced mechanical *** this work,through a facile and rapid powder metallurgy foaming method,the aluminum-silicon(Al-Si)alloy composite foams reinforced by graphene nanosheets(GNSs)are successfully *** microstructure analyses reveal that,for the Al-Si alloy foams incorporating the GNSs(GNSs/Al-Si composite foams),the pore size is transformed to be smaller,the pore size distributions become more homogeneous and the pore shape is also refined to a regular and roundish ***,the shape of Si precipitates is found transforming from an irregular long strip(length of~20μm,width of~5μm)to a fine particle state(diameter of~5μm).Moreover,the compressive testing results show that,the 0.4wt%GNSs/Al-Si composite foams own the optimal compression stress of 11.7±0.5 MPa,plateau stress of 10.0±1.0 MPa and energy absorption capacity of 6.8±0.7 MJ/m^(3),which have improvement of 58.1%,53.8%and 51.1%in comparison with the Al-Si alloy foams counterpart,*** present findings may pave a new way for developing new generation of metallic composite foams that with stable microstructure and excellent mechanical performance.

关键词： Metal matrix composites Aluminum foam Graphene Energy absorption

Quad-channel broadband compact multi-antenna GNSS down-converter for high-reliability navigation

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Transportation Safety and Environment 2023年第4期5卷 100-106页

作者： Riyan Wang Bin Li Hongyin He kunming yang Wei Feng Zhijian Chen School of Microelectronics South China University of TechnologyGuangzhou 510640GuangdongChina Guangzhou Runxin Information Technology Co. LtdGuangzhou 510663GuangdongChina

A high-reliability broadband high-linearity down-converter for multi-antenna global navigation satellite system(GNSS)receiver is presented in this *** on direction-of-arrival estimation,the multi-antenna GNSS receiver can separate the GNSS signals from the interfering signals and suppress harmful broadband radio frequency *** drive the off-chip 50Ω2 resistive load and meet the stringent requirements of linearity,a quad-channel down-converter with a broadband common-gate low-noise transcon-ductance amplifier,current-driven passive mixer and novel bridge mode transimpedance driving amplifier have been proposed to contruct the multi-antenna *** operating frequency of this down-converter is from 1.15 to 1.65 GHz,covering all bands for global positioning system(GPS),Beidou navigation satellite system(BDS),global navigation satellite system(GLONASS)and *** measured results show that the proposed quad-channel down-converter achieves+38 dBm output 3rd order intercept point(OIP3)and+17 dBm OP1dB(output-referred 1 dB compression point),9.5 dB to 12.9 dB noise figure(NF)across the variable gain of 10 dB to 27 dB and approximately 47 dB channel isolation.

关键词： down-converter radio frequency(RF)front-end multi-antenna receiver quad-channel global navigation satellite system(GNSS) broadband

AN ALGEBRAIC ALGORITHM TO VOLTERRA SERIES REPRESENTATION OF A NONLINEAR NETWORK

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Journal of Electronics(China) 1989年第3期6卷 203-212页

作者：王柏勇杨山 Yunnan Institute of Technology Kunming Tianjin University Tainjin

It is important to solve the nth-order Volterra kernel or nonlinear transfer function indescribing a nonlinear network by the Volterra *** on an auxiliary algebraic expression ofthe Volterra series,an algebraic algorithm is proposed to evaluate the nth-order Volterra kernel andnonlinear transfer function in regular,triangular and symmetric *** addition,the complexity ofthe algebraic algorithm is improved.

关键词： Nonlinear network Volterra series Algorithm

Full T-cell activation and function in teleosts require collaboration of first and co-stimulatory signals

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Zoological Research 2024年第1期45卷 13-24页

作者： Wei Liang Kang Li Haiyou Gao kunming Li Jiansong Zhang Qian Zhang Xinying Jiao Jialong yang Xiumei Wei State Key Laboratory of Estuarine and Coastal Research School of Life SciencesEast China Normal UniversityShanghai 200241China Laboratory for Marine Biology and Biotechnology Qingdao National Laboratory for Marine Science and TechnologyQingdaoShandong 266237China

Mammalian T-cell responses require synergism between the first signal and co-stimulatory ***,whether and how dual signaling regulates the T-cell response in early vertebrates remains *** the present study,we discovered that the Nile tilapia(Oreochromis niloticus)encodes key components of the LAT signalosome,namely,LAT,ITK,GRB2,VAV1,SLP-76,GADS,and PLC-γ*** components are evolutionarily conserved,and CD3εmAb-induced T-cell activation markedly increased their ***,at least ITK,GRB2,and VAV1 were found to interact with LAT for signalosome *** of the first signal,the NF-κB,MAPK/ERK,and PI3K-AKT pathways were activated upon CD3εmAb ***,treatment of lymphocytes with CD28 mAbs triggered the AKT-mTORC1 pathway downstream of the co-stimulatory *** CD3εand CD28 mAb stimulation enhanced ERK1/2 and S6 phosphorylation and elevated NFAT1,c-Fos,IL-2,CD122,and CD44 expression,thereby signifying T-cell ***,rather than relying on the first or co-stimulatory signal alone,both signals were required for T-cell *** T-cell activation was accompanied by marked apoptosis and cytotoxic *** findings suggest that tilapia relies on dual signaling to maintain an optimal T-cell response,providing a novel perspective for understanding the evolution of the adaptive immune system.

关键词： Oreochromis niloticus CD3 CD28 T cells Adaptive immunity Evolution

Activation of biomass-derived porous carbon for supercapacitors:A review

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Chinese Chemical Letters 2024年第7期35卷 121-138页

作者： Zixuan Guo Xiaoshuai Han Chunmei Zhang Shuijian He kunming Liu Jiapeng Hu Weisen yang Shaoju Jian Shaohua Jiang Gaigai Duan Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsCollege of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China Institute of Materials Science and Devices Suzhou University of Science and TechnologySuzhou 215009China Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou 341000China Fujian Provincial Key Laboratory of Eco-Industrial Green Technology Key Laboratory of Green Chemical Technology of Fujian Province UniversityCollege of Ecological and Resources EngineeringWuyi UniversityWuyishan 354300China

Due to the advantages of renewable,low pollution and wide distribution of biomass resources,it is selected as the electrode material for *** carbon-based electrode materials,specific surface area and pore structure have a great *** and summarizing the influence of activation on pore structure will greatly broaden this *** on the activation mechanism of activator,this paper summarizes the latest progress of biomass activation applied to supercapacitors,including traditional physical and chemical activation methods and non-traditional methods such as biological activation method,self-activation method,template assisted activation method and green activator ***,the challenges,strategies and prospects for the future development of biomass-derived carbon material activation are pointed *** summary,this review will help researchers choose appropriate strategies to design biomass-derived carbon electrode materials for supercapacitors,thereby promoting the application of biomass materials.

关键词： Biomass-derived Activation Pore structure Electrochemistry Supercapacitor

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仿蜘蛛救援机械臂结构设计与研究

重庆理工大学学报（自然科学） 2018年第8期32卷 88-93页

作者：杨昆明西安航空学院西安710077

针对非结构化环境下的救援任务,结合生物界蜘蛛腿部的运动特性,设计了一种仿蜘蛛式救援机械臂。基于机构学数学基础的拉格朗日方程求解救援机械臂的动力学模型。鉴于救援机器人的实时性、自适应等特性,分析径向基函数神经网络的控制策略... 详细信息

针对非结构化环境下的救援任务,结合生物界蜘蛛腿部的运动特性,设计了一种仿蜘蛛式救援机械臂。基于机构学数学基础的拉格朗日方程求解救援机械臂的动力学模型。鉴于救援机器人的实时性、自适应等特性,分析径向基函数神经网络的控制策略,提出基于径向基函数神经网络救援机械臂的控制策略。采用径向基三层前向网络设计救援机器人的控制方案,重点探讨了救援机器人单关节的神经网络控制方法,并对其进行Matlab仿真。结果表明:所设计的控制方法可实现救援机械臂的自适应性和鲁棒性。

关键词：仿生设计动力学模型神经网络控制

球磨对碳纳米管增强泡沫铝基复合材料压缩与吸能性能的影响

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复合材料学报 2018年第6期35卷 1518-1524页

作者：杨旭东杨昆明邹田春赵乃勤中国民航大学中欧航空工程师学院天津300300 天津大学材料科学与工程学院天津300072 中国民航大学天津市民用航空器适航与维修重点实验室天津300300

因碳纳米管(CNTs)具有优异的性能,被认为是金属基复合材料理想的增强体,因此如何制备得到CNTs增强体均匀分散的金属基复合材料一直是本领域的研究热点。本文通过原位化学气相沉积(CVD)、短时球磨和填加造孔剂的工艺成功制备了CNTs增强... 详细信息

因碳纳米管(CNTs)具有优异的性能,被认为是金属基复合材料理想的增强体,因此如何制备得到CNTs增强体均匀分散的金属基复合材料一直是本领域的研究热点。本文通过原位化学气相沉积(CVD)、短时球磨和填加造孔剂的工艺成功制备了CNTs增强的泡沫铝基复合材料,着重研究了球磨过程对复合泡沫铝的微观形貌、压缩性能和吸能性能的影响规律。结果表明,随着球磨时间的延长,CNTs的分散性提高并逐步嵌入铝基体中,使复合泡沫铝的组织均匀性得到改善。相对于未球磨的含CNTs 3.0wt%的复合泡沫材料,当球磨时间增加至90min时,复合泡沫铝的孔壁硬度、屈服强度和吸能能力分别提高了67%、126%和343%。

关键词：碳纳米管泡沫铝能量吸收粉末冶金微观组织

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测控系统虚拟仪器网络设计

微计算机信息 2005年第9S期21卷 149-150,107页

作者：杨坤明四川省彭州市西华大学计算机数理学院 611930

本文就网络化测控系统的虚拟仪器平台模型的搭建及网络通信技术进行介绍,利用DataSocket控件实现的C/S模式和B/S模式下实现网络通信;并就其实现过程和各模块作了详细阐述。

关键词： DATASoCKET 虚拟仪器网络化测控系统 C/S,B/S