检索结果-南通市图书馆

Effect of rare earth Nd^(3+)doping contents on physical,structural,and magnetic properties of Co-Ni spinel ferrite nanoparticles

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2023年第11期41卷 1746-1753,I0004页

作者： Junjiao Li muhammad Yousaf Qaisar Hayat muhammad Akbar Asma Noor mak Yousaf Shah Fenghua Qi Yuzheng Lu Department of Electronic and Engineering Nanjing Vocational Institute of Mechatronic TechnologyNanjing211306China Energy Storage Joint Research Centre School of Energy and EnvironmentSoutheast UniversityNanjing210096China Shenzhen key Laboratory of Laser Engineering Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics EngineeringCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen518060China Hubei Collaborative Innovation Centre for Advanced Organic Chemical materials Faculty of Physics and Electronic ScienceHubei UniversityWuhan430062China College of Electronic and Engineering Nanjing Xiaozhuang UniversityNanjing211171China

Rare earth(RE)low doping has a significant influence on the structural,morphological,and magnetic properties of spinel ferrite ***,rare earth neodymium(Nd)oxide was fully doped into spinel ferrite with a composition of Co_(0.80)Ni_(0.20)Nd_xFe_(2-x)O_4(x=0.0,0.05,0.10,and 0.15)using the sol-gel auto combustion *** analysis of the synthesized samples with low doping of Nd using X-ray diffraction(XRD)and Rietveld refinements reveals a pure single-phase cubic structure,while the second phase appears with increasing content of Nd^(3+)at x=0.10 and *** electron microscopy(SEm)and high-resolution transmission electron microscopy(HR-TEm)show well-shaped spherical grains within the nanometer range of the pure Co_(0.80)Ni_(0.20)Fe_(2)O_(4) sample,while larger grains with the presence of agglomeration are observed with doping of Nd^(3+)into the spinel ferrite *** magnetic parameters,i.e.,saturation magnetization m_s,remanence and magnetic moments exhibit decreasing trend with Nd^(3+)doping and m_s values are in 65.69 to 53.34 emu/g *** coercivity of the Nd-doped Co-Ni spinel ferrite sample was calculated to be 1037.76 to~827.24 *** work demonstrates remarkable improvements in the structural and magnetic characteristics of Nddoped Co-Ni spinel ferrite nanoparticles for multiple versatile applications.

关键词： Co-Ni spinel ferrites Rare earth Nd^(3+)doping Structural analysis magnetic evaluations

室内通风系统气流噪声预测方法的改进(英文)

在线全文

学校读者我要写书评

暂无评论

华南理工大学学报（自然科学版） 2007年第B10期35卷 104-107页

作者：麦卓明香港理工大学屋宇设备工程系

管道气流噪声是室内通风系统中的常见问题.由于后期改造十分困难,在设计阶段对由管道内障碍物等因素产生的气流噪声进行精确的预测计算是非常必要的.目前已有一些管道气流噪声预测的基本方法,但是很多预测手段都基于传统声学测量得到的... 详细信息

管道气流噪声是室内通风系统中的常见问题.由于后期改造十分困难,在设计阶段对由管道内障碍物等因素产生的气流噪声进行精确的预测计算是非常必要的.目前已有一些管道气流噪声预测的基本方法,但是很多预测手段都基于传统声学测量得到的数据.笔者近来不依赖于传统的测量数据,研究了运用计算流体动力学理论对管道内气流噪声进行预测的可行性,文中讨论了采用该方法遇到的问题以及近期在采用计算流体动力学计算气流噪声方面的研究工作.

关键词：声压级气流管道气流噪声预测通风系统

A Stochastic model for the Control of Intelligent Assembly Robots

在线全文

学校读者我要写书评

暂无评论

A Stochastic Model for the Control of Intelligent Assembly R...

Layer-by-layer alloying of NIR-Ⅱ emissive m50(Au/Ag/Cu)superatomic nanocluster

第十九届中国控制会议

作者： k．L．mak H．Y．k．Lau m．C．C．Ngan Department of Industrial and manufacturing Systems Engineering The University of Hong kong Pokfulam RoadHong Kong Department of Industrial and manufacturing Systems Engineering The University of Hong kong Pokfulam RoadHong Kong Department of Industrial and manufacturing Systems Engineering The University of Hong kong Pokfulam RoadHong Kong

＜正＞The topic of automated assembly is widely addressed by the robotics communities. However, so far there is no systematic framework to assist the construction of an intelligent robot control system. Even systems so called intelligent systems are not truly intelligent when they are compared to human. It is therefore essential to define and analyse the necessary intelligence criteria that an intelligent robot should posses. Such criteria are then implemented on an appropriate control platform so as to enhance the intelligence of the robot. As such, one of the principal aims of this paper is to discuss and identify the criteria of machine intelligence that are central to achieving an intelligent robot. With these criteria as basis, the paper then presents an intelligent framework that is based on the stochastic hidden markov model （Hmm）. This framework consists of a number of functional blocks for the design and implementation of an intelligent robot control system. Each functional block is responsible for a corresponding feature with specific intelligent capabilities. The paper starts with a review of the applications of Hmm in automated assembly, which is followed by the description of the main features and architecture of the proposed framework.

关键词： Hidden markov models intelligent robots control systems architecture force 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

Nano Research 2022年第6期15卷 5569-5574页

作者： Xiao-Hong ma Jing-Tao Jia Peng Luo Zhao-Yang Wang Shuang-Quan Zang Thomas C.W.mak Henan key Laboratory of Crystalline molecular Functional materials Henan International Joint Laboratory of Tumor Theranostical Cluster MaterialsGreen Catalysis Centerand College of ChemistryZhengzhou UniversityZhengzhou 450001China Department of Chemistry The Chinese University of Hong KongHong Kong 999077China

The intermetallic synergy plays a critical role in exploring the chemical-physical properties of metal ***,the controlled doping or layer-by-layer alloying of atom-precise metal nanoclusters(NCs)has long been a challenging *** this work,two novel alloy nanoclusters[PPh_(4)]_(4)[Ag_(32)Cu_(18)(PFBT)_(36)]((AgCu)_(50))and[PPh_(4)]_(4)[Au_(12)Ag_(20)Cu_(18)(PFBT)_(36)](Au_(12)(AgCu)_(38)),where PFBT is pentafluorobenzenethiolate,with shell-by-shell configuration of m_(12)@Ag_(20)@Cu_(18)(PFBT)_(36)(m=Ag/Au)were synthesized by a facile one-pot co-reduction ***,a fingerprint library of[Ag_(50)−xCux(PFBT)_(36)]^(4−)(x=0 to 50)from Ag_(50)to Cu_(50)has been successfully established as revealed by electrospray ionization mass ***-crystal X-ray diffraction analysis of trimetallic Au_(12)(AgCu)_(38)confirmed the layer-by-layer alloying under reducing *** is more,(AgCu)_(50)and Au12(AgCu)_(38)both show broad photoluminescence(PL)peak in the second near-infrared(NIR-II)window,and the Au doping in the innermost shell considerably enhances the photoluminescence *** work not only offers an insight in the process of metal cluster alloying but also provides a platform to study the doping-directed PL properties in the multimetallic cluster system.

关键词： alloy nanocluster second near infrared(NIR-II)emission superatom doping

Production systems and important antimicrobial resistant-pathogenic bacteria in poultry:a review

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

Journal of Animal Science and Biotechnology 2023年第2期14卷 481-500页

作者： Philip H.W.mak muhammad Attiq Rehman Elijah G.kiarie Edward Topp moussa S.Diarra Guelph Research and Development Centre Agriculture and Agri-Food Canada(AAFC)GuelphONCanada Department of Animal Biosciences University of GuelphGuelphONCanada London Research and Development Center AAFCLondonONCanada.

Economic losses and market constraints caused by bacterial diseases such as colibacillosis due to avian pathogenic Escherichia coli and necrotic enteritis due to Clostridium perfringens remain major problems for poultry producers,despite substantial efforts in prevention and *** have been used not only for the treatment and prevention of such diseases,but also for growth ***,these practices have been linked to the selection and spread of antimicrobial resistant bacteria which constitute a significant global threat to humans,ani-mals,and the *** break down the antimicrobial resistance(AmR),poultry producers are restricting the antimicrobial use(AmU)while adopting the antibiotic-free(ABF)and organic production practices to satisfy consum-ers’***,it is not well understood how ABF and organic poultry production practices influence AmR profiles in the poultry gut *** Gram-negative(Salmonella enterica serovars,Campylobacter jejuni/coli,***)and Gram-positive(Enterococcus spp.,Staphylococcus *** ***)bacteria harboring multiple AmR determinants have been reported in poultry including organically-and ABF-raised *** this review,we discussed major poultry production systems(conventional,ABF and organic)and their impacts on AmR in some potential pathogenic Gram-negative and Gram-positive bacteria which could allow identifying issues and opportuni-ties to develop efficient and safe production practices in controlling pathogens.

关键词： Antibiotic-free Antimicrobial resistance Conventional feeding Organic Poultry

在线全文

学校读者我要写书评

暂无评论

铌酸锶钡薄膜的微结构与电光性能的研究

光学学报 2002年第10期22卷 1170-1175页

作者：叶辉 melanie m T Ho mak C L 浙江大学现代光学仪器国家重点实验室杭州310027 香港理工大学应用物理系及材料研究中心

本文叙述了使用溶胶凝胶法在mgO(0 0 1)的衬底上制备铌酸锶钡薄膜的过程 ,膜层厚度可达 5 μm。通过X射线衍射、摇摆曲线、扫描、拉曼散射光谱等方法研究了薄膜的微结构性能 ,实验发现 ,铌酸锶钡薄膜具有了较好的 (0 0 1)方向的优先... 详细信息

本文叙述了使用溶胶凝胶法在mgO(0 0 1)的衬底上制备铌酸锶钡薄膜的过程 ,膜层厚度可达 5 μm。通过X射线衍射、摇摆曲线、扫描、拉曼散射光谱等方法研究了薄膜的微结构性能 ,实验发现 ,铌酸锶钡薄膜具有了较好的 (0 0 1)方向的优先取向性能 ,并且随着薄膜厚度的增加 ,其晶体取向性也会随之不断改进。熔石英的透明衬底上生长的SBN薄膜具有较大的电致双折射效应 ,其有效电光系数能够高达 6 6 2× 10 -11m/V。

关键词：铌酸锶钡薄膜微结构电光性能光纤通信

Low-Cost High-Performance 10 G Transmitter and Receiver Optical Subassembly

在线全文

学校读者我要写书评

暂无评论

光学学报 2003年第S1期23卷 607-608页

作者： k.S. Cheng E. Cheung R. Cheung S. Cheung A. Chow C.W. Fan H.W. Ho A. Hui m.W.k. mak S.k. Lam S.L. Lau k.S. Lee A. Siu S.k. Yau F. Tong Hong kong Applied Science and Technology Research Institute 18F Gateway Tower 6 Tsim Sha Tsui Hong KongChina Also at the Information Engineering Department The Chinese University of Hong Kong Shatin Hong Kong China

We describe briefly here the recent R&D activities in the optical subassembly packaging technologies at the Hong kong Applied Science and Technology Research Institute (ASTRI). We have designed, developed and prototyped multiple of low-cost high performance packages for serial and parallel transmitters and receivers, in particular, the novel chip-in-plastic (CiP) package designed for 10G serial transmission for data communications.

关键词： Science and Technology serial transmission data communications high performance Hong kong

Interacting with α7 nAChR is a new mechanism for AChE to enhance the inflammatory response in macrophages

在线全文

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2020年第10期10卷 1926-1942,2020页

作者： Etta Y.L.Liu Yingjie Xia Xiangpeng kong maggie S.S.Guo Anna X.D.Yu Brody Z.Y.Zheng Shinghung mak miranda L.Xu karl W.k.Tsim key Laboratory of Food Quality and Safety of Guangdong Province College of Food ScienceSouth China Agricultural UniversityGuangzhou 510642China Shenzhen key Laboratory of Edible and medicinal Bioresources the Hong Kong University of Science and TechnologyShenzhen 518057China Division of Life Science Center for Chinese Medicinethe Hong Kong University of Science and TechnologyHong kongChina

Acetylcholine(ACh)regulates inflammation viaα7 nicotinic acetylcholine receptor(α7 nAChR).Acetylcholinesterase(AChE),an enzyme hydrolyzing ACh,is expressed in immune cells suggesting non-classical function in inflammatory ***,the expression of PRimA-linked G4 AChE was identified on the surface of *** lipopolysaccharide-induced inflammatory processes,AChE was upregulated by the binding of NF-κB onto the ACHE ***,the overexpression of G4 AChE inhibited ACh-suppressed cytokine release and cell migration,which was in contrast to that of applied AChE ***,a DNA construct without enzymatic activity,was adopted to identify the protein role of AChE in immune *** of G4 AChEmt induced cell migration and inhibited ACh-suppressed cell *** co-localization ofα7 nAChR and AChE was found in macrophases,suggesting the potential interaction ofα7 nAChR and ***,immunoprecipitation showed a close association ofα7 nAChR and AChE protein in cell ***,the novel function of AChE in macrophage by interacting withα7 nAChR was *** with hydrolysis of ACh,AChE plays a direct role in the regulation of inflammatory *** such,AChE could serve as a novel target to treat age-related diseases by antiinflammatory responses.

关键词： macrophage AChE Cholinergic anti-inflammatory pathway α7 nAChR

在线全文

学校读者我要写书评

暂无评论

室内空调系统中空气流动的CFD研究

华北电力大学学报（自然科学版） 2003年第2期30卷 71-77页

作者：朱永波姜根山 C.m.mak 北京长城航空测控技术研究所北京100080 华北电力大学应用物理系河北保定071003 香港理工大学屋宇设备工程学系

室内环境质量受到越来越多的重视。室内环境质量包括声环境、光环境、热环境和室内空气质量(IAQ)。室内空气质量(IAQ)会影响建筑物内部人群的工作效率和健康状况。开发了一种计算流体力学(CFD)软件,并用来模拟了几种典型的室内空调系统... 详细信息

室内环境质量受到越来越多的重视。室内环境质量包括声环境、光环境、热环境和室内空气质量(IAQ)。室内空气质量(IAQ)会影响建筑物内部人群的工作效率和健康状况。开发了一种计算流体力学(CFD)软件,并用来模拟了几种典型的室内空调系统中的气体流动。这些算例能够用来改进和优化空调系统部件的设计。CFD软件模拟算例的结果图显示了流动的压力分布和速度场。采用有限体积法Ni格式求解N.S方程,并为更好地模拟粘性流动,使用了k-ε湍流模型。

关键词：空调系统空气流动室内环境质量