检索结果-南通市图书馆

Adaptive Stabilization for Uncertain Nonholonomic Dynamic Mobile Robots Based on Visual Servoing Feedback

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

自动化学报 2011年第7期37卷 857-864页

作者： YANG Fang WANG chao-li Control Science and Engineering Department University ofShanghai for Science and Technology Shanghai 200093 P.R. China School of Science Ningbo University of Technology Ningbo315016. P.R. China

nonholonomic 的稳定问题动态活动机器人与一修理(装天花板) 照相机在这份报纸被探讨。首先，一个照相机目标视觉 servoing 运动学的模型被利用针孔照相机模型介绍，一个运动学的稳定控制器为运动学的模型被给。然后，一个适应滑动模式... 详细信息

nonholonomic 的稳定问题动态活动机器人与一修理(装天花板) 照相机在这份报纸被探讨。首先，一个照相机目标视觉 servoing 运动学的模型被利用针孔照相机模型介绍，一个运动学的稳定控制器为运动学的模型被给。然后，一个适应滑动模式控制器被设计面对与照相机系统联系的参量的无常稳定不明确的动态活动机器人。建议控制器不仅对象集体变化那样的结构化的无常而且到象骚乱那样的未组织的柔韧。建议控制系统的稳定性和估计的参数的固定被 Lyapunov 方法严厉地证明。模拟结果被介绍说明控制法律的表演。

关键词：自动化系统自动化技术 ICA 数据处理

An Orthorhombic Phase of Superhard o-BC_4N

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2019年第3期36卷 65-69页

作者： Nian-Rui Qu Hong-chao Wang Qing li Zhi-Ping li Fa-Ming Gao Key Laboratory of Applied Chemistry Yanshan University

A potential superhard o-BC_4 N with Imm2.space group is identified by ab initio evolutionary methodology using CALYPSO code. The structural, electronic and mechanical properties of o-BC_4N are investigated. The elastic calculations indicate that o-BC_4N is mechanically stable. The phonon dispersions imply that this phase is dynamically stable under ambient conditions. The structure of o-BC_4N is more energetically favorable than o-BC_4N above the pressure of 2..1 GPa. Here o-BC_4N is a semiconductor with an indirect band gap of about 3.95 eV, and the structure is highly incompressible with a bulk modulus of 396.3 GPa and shear modulus of 456.0 GPa. The mechanical failure mode of o-BC_4N is dominated by the shear type. The calculated peak stress of 58.5 GPa in the(100)[001] shear direction sets an upper bound for its ideal strength. The Vickers hardness of o-BC_4N reaches 78.7 GPa, which is greater than that of t-BC_4N and bc-BC_4N proposed recently, confirming that o-BC_4N is a potential superhard material.

关键词： An Orthorhombic Phase structure

在线全文

学校读者我要写书评

暂无评论

铅基反应堆海洋核动力发展研究

中国工程科学 2024年第2期26卷 63-73页

作者：吴宜灿柏云清李春京李阳刘少军王芳蒋洁琼吴庆生刘超周丹娜凤麟核团队中子科学国际研究院山东青岛266199 山东大学核科学技术研究院济南250061 山东省中子科学技术重点实验室山东青岛266199 中子科学(重庆)研究院有限公司重庆401331 国科中子能(青岛)研究院有限公司山东青岛266041 不详

铅基反应堆(铅基堆)核动力具有固有安全、小型轻量、长寿高效等突出优点,在先进海洋装备、无人潜航器、深海空间站的能源动力上应用前景广阔;在加快建设海洋强国的背景下,保障海洋能源供给成为重要的基础条件,开展铅基堆海洋核动力发展... 详细信息

铅基反应堆(铅基堆)核动力具有固有安全、小型轻量、长寿高效等突出优点,在先进海洋装备、无人潜航器、深海空间站的能源动力上应用前景广阔;在加快建设海洋强国的背景下,保障海洋能源供给成为重要的基础条件,开展铅基堆海洋核动力发展研究是推动我国海洋装备能源动力技术革新的关键内容。本文总结了海洋核动力的应用场景与发展需求,从技术特征、代表性应用、研制现状等方面系统梳理了铅基堆核动力的发展概况,凝练和剖析了包括核燃料与包壳材料、一回路关键设备、冷却剂工艺与氧测控、先进发电技术在内的铅基堆海洋核动力关键技术。立足国情研判了铅基堆海洋核动力面临的发展挑战,提出了低温铅基堆海洋核动力、高温高效铅基堆海洋核动力、一体化全自然循环铅基堆海洋核动力等可行技术路线。研究建议,强化前瞻性配套专项技术研发、加快部署装备示范工程,将铅基堆纳入重大能源战略、加快建设标准体系,设置国家级联合研发机构、构建科技创新和产业发展新模式,更好服务国家海洋战略并推动海洋核动力跨越式发展。

关键词：铅基反应堆海洋核动力海洋装备深海核电源无人潜航器

In situ Raman,FTIR,and XRD spectroscopic studies in fuel cells and rechargeable batteries

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第4期16卷 4855-4866页

作者： Fan Gao Xiang-Dong Tian Jia-Sheng lin Jin-chao Dong Xiu-Mei lin Jian-Feng li Xiamen Cardiovascular Hospital State Key Laboratory of Physical Chemistry of Solid SurfacesCollege of Chemistry and Chemical EngineeringCollege of EnergyXiamen UniversityXiamen 361005China Department of Chemistry and Environment Science Fujian Province University Key Laboratory of Analytical ScienceMinnan Normal UniversityZhangzhou 363000China

As state-of-the-art electrochemical energy conversion and storage(EECS)techniques,fuel cells and rechargeable batteries have achieved great success in the past ***,modern societies’ever-growing demand in energy calls for EECS devices with high efficiency and enhanced performance,which mainly rely on the rational design of catalysts,electrode materials,and electrode/electrolyte interfaces in EESC,based on in-deep and comprehensive mechanistic understanding of the relevant electrochemical redox *** an understanding can be realized by monitoring the dynamic redox reaction processes under realistic operation conditions using in situ techniques,such as in situ Raman,Fourier transform infrared(FTIR),and X-ray diffraction(XRD)*** techniques can provide characteristic spectroscopic information of molecules and/or crystals,which are sensitive to structure/phase changes resulted from different electrochemical working conditions,hence allowing for intermediates identification and mechanisms *** review described and summarized recent progress in the in situ studies of fuel cells and rechargeable batteries via Raman,FTIR,and XRD *** applications of these in situ techniques on typical electrocatalytic electrooxidation reaction and oxygen reduction reaction(ORR)in fuel cells,on representative high capacity and/or resource abundance cathodes and anodes,and on the solid electrolyte interface(SEI)in rechargeable batteries are *** discuss how these techniques promote the development of novel EECS systems and highlight their critical importance in future EECS research.

关键词： in situ spectroscopy Raman Fourier transform infrared spectroscopy(FTIR) X-ray diffraction(XRD) fuel cells rechargeable batteries

Pressure-tuning domain-wall chirality in noncentrosymmetric magnetic Weyl semimetal CeAlGe

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

Science China(Physics,Mechanics & Astronomy) 2023年第3期66卷 121-129页

作者： Xiaobo He Yuke li Hai Zeng Zengwei Zhu Shiyong Tan Yongjun Zhang chao Cao Yongkang Luo Wuhan National High Magnetic Field Center and School of Physics Huazhong University of Science and TechnologyWuhan 430074China School of Physics and Hangzhou Key Laboratory of Quantum Matter Hangzhou Normal UniversityHangzhou 311121China Science and Technology on Surface Physics and Chemistry Laboratory Mianyang 621908China Institute for Advanced Materials Hubei Normal UniversityHuangshi 435002China Center for Correlated Matter and School of Physics Zhejiang UniversityHangzhou 310058China

Topological magnetic Weyl semimetals have been proposed to host controllable chiral domain walls which bear a great prospect in device applications. To exploit them in applications, it is important to have a proper way to tune and manipulate these domain walls. One possible means is through magnetoelastic coupling. The involvement of rare earth in the lately proposed RAl X(R =rare earth, X = Si and Ge) family magnetic Weyl semimetals may provide such a platform. Here we present the transport and thermodynamic properties of Ce Al Ge under hydrostatic pressure. We find that pressure enhances the antiferromagnetic exchange in Ce Al Ge but essentially retains its magnetic structure. A large topological Hall effect with a pronounced loop shape is observed within the magnetically ordered state, and it splits into two regions under pressure. Such an unusual electromagnetic response is inferred to be a consequence of chiral magnetic domain walls. The unprecedented concomitance of its evolution under pressure and the reentrance of antiferromagnetic order strongly suggest the capability of switching on/off this electromagnetic response in noncentrosymmetric magnetic Weyl semimetals via magnetoelastic coupling.

关键词： magnetic Weyl semimetals loop-shaped topological Hall effect domain wall Weyl point magnetoelastic coupling

Therapeutic effect of secretome from TNF-αstimulated mesenchymal stem cells in an experimental model of corneal limbal stem cell deficiency

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2021年第2期14卷 179-185页

作者： Guo-Hu Di Xia Qi Jing Xu chao-Qun Yu Qi-Long Cao Zhi-Jun Xing Zhi-chao li School of Basic Medicine Qingdao UniversityQingdao266071Shandong ProvinceChina Shandong Eye Institute Qingdao266071Shandong ProvinceChina Qingdao Haier Biotech Co.Ltd. Qingdao266071Shandong ProvinceChina Qingdao Hospital of Traditional Chinese Medicine(Qingdao Hiser Hospital) Qingdao266033Shandong ProvinceChina Department of Gynecology and Obstetrics Qingdao Municipal HospitalQingdao UniversityQingdao266033Shandong ProvinceChina

AIM:To explore the secretome efficacy in tumor necrosis factor(TNF)-αstimulated mouse mesenchymal stem cells(MSCs)in a murine model of corneal limbal alkali ***:Corneal limbal stem cell deficiency(LSCD)was created in the eyes of male C57 *** conditioned medium from TNF-αstimulated MSCs(MSC-CMT)was applied topically for 4 wk,with basal medium and conditioned medium from MSCs as *** opacification,corneal inflammatory response,and corneal neovascularization(NV)were *** epithelial cell apoptosis,corneal conjunctivation,and inflammatory cell infiltration were assessed with TUNEL staining,CK3 and Muc-5 AC immunostaining,and CD11 b immunofluorescence staining,*** effect of TSG-6 was further evaluated by knockdown with short hairpin RNA(sh RNA).RESULTS:Compared to the controls,topical administration of MSC-CMT significantly ameliorated the clinical symptoms of alkali-induced LSCD,with restrained corneal NV,reduced corneal epithelial cell apoptosis,and inhibition of corneal *** addition,MSC-CMT treatment significantly reduced CD11 b+inflammatory cell infiltration,and inhibited the expression of pro-inflammatory cytokines(IL-1β,TNF-αand IL-6).Furthermore,the promotion of corneal epithelial reconstruction by MSC-CMT was largely abolished by TSG-6 ***:Our study provides evidence that MSCCMT enhances the alleviation of corneal alkali injuries,partially through TSG-6-mediated anti-inflammatory protective ***-CMT may serve as a potential strategy for treating corneal disorders.

关键词： MSC-CMT limbal stem cell deficiency TSG-6

Rational design of Sn_(4)P_(3)/Ti_(3)C_(2.Tx composite anode with enhanced performance for potassium-ion battery

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

Rare Metals 2022年第7期41卷 2259-2267页

作者： Jie Zhao chao-lin li Gang Chen Fei Ji Yi-Yong Shen Juan Peng Wen-Hui Wang School of Civil and Environmental Engineering Harbin Institute of TechnologyShenzhen 518055China Shenzhen Environmental Technology Group Co.Ltd. Shenzhen 518049China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China

The potential application of high-capacity Sn_(4)P_(3)anode for potassium-ion batteries(PIBs)is hindered by the poor cycle stability mainly rooted from the huge volume changes upon cycling and low electronic *** address the above issues,sandwich-like struc-tured Sn_(4)P_(3)/Ti_(3)C_(2.T_(x)was designed and synthesized as anode material for *** a result,Sn_(4)P_(3)/Ti_(3)C_(2.T_(x)pre-sents superior cycle stability(retains a capacity of 103.2.mAh·g^(-1)even after 300 cycles at 1000 mA·g^(-1))and rate capability(delivers 60.7 mAh·g^(-1)at high current density of 2.00 mA·g^(-1)).The excellent electrochemical perfor-mance of sandwich-like structured Sn_(4)P_(3)/Ti_(3)C_(2.Tx is orig-inated from the synergistic effect between Sn_(4)P_(3)and Ti_(3)C_(2.T_(x),where Ti_(3)C_(2.T_(x)acts as a conductive matrix to facilitate electron transfer and buffer the volume change of Sn_(4)P_(3)particles upon cycling,while Sn_(4)P_(3)serves as pillars to prevent the collapse and stacking of Ti_(3)C_(2.T_(x)***,significant capacitive contribution is demonstrated as a major contributor to the excellent rate capability.

关键词： Sn_(4)P_(3) Ti_(3)C_(2. TxAnode material Potassium-ion battery

Mechanical property statistical analysis of Gd50Al30Co2. amorphous wires for providing reference to design requirements of cooling system

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2018年第3期25卷 261-267页

作者： Bin Luo Hong-xian Shen lin lin Hai-chao li Da-wei Xing Jian-fei Sun School of Mechatronics Engineering Harbin Institute ofTechnology Harbin 150001 Heilongjiang China School of Materials Science and Engineering HarbinInstitute of Technology Harbin 150001 Heilongjiang China

Gd50Al3oCo2. wires show excellent magnetocaloric properties and high heat exchange rate due to the microsize. The Weibull and lognormal methods were used for systematically analyzing its mechanical properties for matching the design requirements in cooling system. The wire exhibits average fracture strength of-969.5 MPa and typical fracture behavior of amorphous character. Moreover, the distributions of stresses for tensile strains at 10 values are estimated by probability plot and Chi-square goodness-of-fit test. The random stresses were best fitted by lognormal probability distribution for most studied cases; however, fracture strength was best fitted by Weibull probability distribution. It is interesting to note that the mean and standard deviation of the stresses （to reach specific tensile strain） increase as the tensile strain grows, accompanied by the coefficients of variation of stresses which decrease smoothly. It is concluded that the inhomogeneity of material does cause the scatter of stresses growth, and the scatter could be considerably large.

关键词： Gd50Al30Co2. amorphous wire Tensile property Statistical analysis Variation coefficient

Cerium-yttrium binary oxide microflower:synthesis,characterization and catalytic dehydration property

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

Rare Metals 2021年第7期40卷 1785-1800页

作者： Cheng Pan Ben-Hua Huang chao Fan Xiao-Yong li Pei-Gen Su A-Qun Zheng Yang Sun Department of Applied Chemistry School of ScienceXi’an Jiaotong UniversityXi’an 710049China

Cerium dioxide has a comparatively lower Ce4+/Ce3+redox pair,which leaves abundant oxygen vacancies on oxide lattice,also making incorporation of foreign ion and subsequent applications feasible and *** this work,a series of cerium-yttrium mixed oxides were prepared by using polyvinylpyrrolidone as major template through sol-gel,which were further employed as catalyst for dehydration of aniline with formic acid into *** reveal that synthetic samples have a variety of morphologies including nanoparticle,microflower,and uniform *** monitoring of particle size,zeta potential,and ultravioletvisible(UV-Vis)of preparative solution indicate that selfassembly of polyvinylpyrrolidone and its subsequent reaction with metal ion determines sample *** catalytic dehydration,all samples show high dehydration efficiencies that are comparable to those from anhydrous Na2.O4 and combination of dicyclohexylcarbodiimide with 4-dimethylaminopyridine and dichloromethane shows better outputs than *** association with structural analysis,cerium looks more active than yttrium,while yttrium mainly plays as a structure-directing and *** micro-/nanofabrication of rare earth composites and their catalytic applications.

关键词： Cerium-yttrium binary oxide Microflower Morphology Formation monitoring Catalytic dehydration