检索结果-南通市图书馆

Effect of shot peening on microstructure,nanocrystallization and microhardness of Ti-10V-2Fe-3Al alloy surface

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 Iron and Steel Research International 2019年第1期26卷 52-58页

作者： hai-zhong zheng Sheng-hua Guo Qin-hao Luo Xiao-yong Shu Gui-fa Li National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology Nanchang Hangkong UniversityNanchang 330063JiangxiChina

Severe plastic deformation of Ti-10V-2Fe-3Al alloy in the surface region was caused by shot peening at air pressure of 0.6 MPa with processing time ranging from 1 to 45 *** results showed that the thickness of surface deformation layer was proportio nal to the processing time,the microhardness of the shot-peened surface in creased from 280 to 385 HV,and the depth of highly hardening layers arrived at 200μ*** was worth noting that a grain size gradient from nanocrystalline on the surface toward coarse grain in the matrix was obtained during the shot peening process and the minimum grain size in the top surface after shot peening was about 100-200 nm.

关键词： Ti-10V-2Fe-3Al alloy Shot peening treatment Surface nanocrystallization Martensitic transformation Microhardness

Adaptive Trajectory Tracking Control for Nonholonomic Wheeled Mobile Robots:A Barrier Function Sliding Mode Approach

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

IEEE/CAA Journal of Automatica Sinica 2024年第4期11卷 1007-1021页

作者： Yunjun zheng Jinchuan zheng Ke Shao Han Zhao Hao Xie hai Wang the School of Mechanical Engineering Hefei University of TechnologyHefei 230009China the School of Science Computing and Engineering TechnologiesSwinburne University of TechnologyHawthorn VIC 3122Australia the School of Civil Aviation Northwestern Polytechnical UniversityXi’an 710072China the Shanghai Aerospace Control Technology Institute Shanghai 201109 the School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China the College of Science HealthEngineering and EducationMurdoch UniversityPerth WA6150Australia

The trajectory tracking control performance of nonholonomic wheeled mobile robots(NWMRs)is subject to nonholonomic constraints,system uncertainties,and external *** paper proposes a barrier function-based adaptive sliding mode control(BFASMC)method to provide high-precision,fast-response performance and robustness for *** with the conventional adaptive sliding mode control,the proposed control strategy can guarantee that the sliding mode variables converge to a predefined neighborhood of origin with a predefined reaching time independent of the prior knowledge of the uncertainties and disturbances *** advantage of the proposed algorithm is that the control gains can be adaptively adjusted to follow the disturbances amplitudes thanks to the barrier *** benefit is that the overestimation of control gain can be eliminated,resulting in chattering ***,a modified barrier function-like control gain is employed to prevent the input saturation problem due to the physical limit of the *** stability analysis and comparative experiments demonstrate that the proposed BFASMC can ensure the prespecified convergence performance of the NWMR system output variables and strong robustness against uncertainties/disturbances.

关键词： Adaptive sliding mode barrier function nonholonomic wheeled mobile robot(NWMR) trajectory tracking control

Optimized design of LED freeform lens for uniform circular illumination

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science C(Computers and Electronics) 2012年第12期13卷 929-936页

作者： Peng LIU Reng-mao WU Zhen-rong zheng hai-feng LI Xu LIU State Key Laboratory of Modern Optical Instrumentation Zhejiang University Hangzhou 310027 China

An optimization method is proposed for designing an LED freeform lens which produces a uniform circular pattern with high energy *** method is composed of three main aspects:design of the initial guess,parameterization of the freeform surface,and construction of the merit *** initial guess is created by solving an ordinary differential equation *** approach of selecting optimization points is introduced for parameterization of the freeform *** merit function is constructed by use of the irradiance uniformity and the efficiency of the *** examples are given,and the results show that the irradiance distribution is well controlled with a maximum uniformity(the relative standard deviation of irradiance,RSD) of 0.0122 and a maximum efficiency of 93.88%.This optimization method can be generalized to design freeform lenses with different lighting patterns or without rotational symmetry.

关键词： Illumination design Lenses Light emitting diode(LED) Non-imaging optics

The role of synphilin-1 in the pathogenesis of Parkinson’s disease

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2006年第4期22卷 239-243页

作者： Rui zheng hai-Yan ZHOU Sheng-Di CHEN Department of Neurology and Institute of Neurology Shanghai Jiaotong University School of Medicine Shanghai 200025China

Parkinson’s disease (PD) is one of the commonest neurodegenerative disorders characterized by the loss of dopaminergic (DAergic) neurons in the substantia nigra and the appearance of Lewy bodies (LBs), whose cytoplasmic inclusions are highly enriched with ubiquitin, synphilin-1, α-synuclein and parkin. Synphilin-1 is an α-synuclein-binding protein and a major component of LBs. It is widely accepted that synphilin-1 is involved in the pathogenic process of PD. This review will provide an overall view of the role of synphilin-1 in the pathogenesis of Parkinson’s disease and the latest findings in this field.

关键词： synphlin- 1 Parkinson's disease α-synuclein

New Exact Solutions and Interactions Between Two Solitary Waves for (3+1)-Dimensional Jimbo-Miwa System

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第5期49卷 1245-1248页

作者： MA Song-Hua FANG Jian-Ping HONG Bi-hai zheng Chun-Long College of Mathematics and Physics Lishui University Lishui 323000 China

By means of an extended mapping approach and a linear variable separation approach, a new family of exact solutions of the （3＋1）-dimensional Jimbo-Miwa system is derived. Based on the derived solitary wave solution... 详细信息

关键词： (3+1)-dimensional Jimbo-Miwa system exact solutions localized excitations the interactionsbetween two solitary waves

在线全文

学校读者我要写书评

暂无评论

改性聚丙烯纤维对水泥砂浆性能影响研究

砖瓦 2024年第6期 23-25页

作者：许哲涛郑海华张晓倩山东省建筑工程质量检验检测中心有限公司山东济南250031 山东珞珈计量检测有限公司山东济南250031

采用包覆改性法对聚丙烯纤维进行改性处理,研究了改性纤维对水泥砂浆力学性能的影响。试验结果表明:改性聚丙烯纤维掺量为0.6%时,试样强度达到峰值,其3d、28d抗折强度和抗压强度分别为4.34MPa、7.62MPa和22.14MPa、43.25MPa,较未掺纤维... 详细信息

采用包覆改性法对聚丙烯纤维进行改性处理,研究了改性纤维对水泥砂浆力学性能的影响。试验结果表明:改性聚丙烯纤维掺量为0.6%时,试样强度达到峰值,其3d、28d抗折强度和抗压强度分别为4.34MPa、7.62MPa和22.14MPa、43.25MPa,较未掺纤维试样B1分别提高了9.05%、8.24%和15.61%、10.19%。采用SEM对聚丙烯纤维表面微观形貌及试样断口形貌进行观察,探讨了改性聚丙烯纤维对水泥砂浆试样的增强机制。

关键词：水泥砂浆改性聚丙烯纤维微观形貌

转录因子IRF3充分活化在调节先天抗病毒免疫反应中的作用机制解析

在线全文

学校读者我要写书评

暂无评论

中国兽医科学 2024年第2期54卷 282-282页

作者： Wei-Wei Li Xu-Xu Fan Zi-Xiang Zhu Xue-Jing Cao Zhao-Yu Zhu Dan-Shi Pei Yi-Zhuo Wang Ji-Yan Zhang Yan-Yi Wang hai-Xue zheng State Key Laboratory for Animal Disease Control and Prevention College of Veterinary Medicine Lanzhou University Lanzhou Veterinary Research Institute Chinese Academy of Agricultural Sciences Lanzhou China Key Laboratory of Special Pathogens and Biosafety Wuhan Institute of Virology Center for Biosafety Mega-Science Chinese Academy of Sciences Wuhan China Gansu Province Research Center for Basic Disciplines of Pathogen Biology Lanzhou China

翻译后修饰在调节Ⅰ型干扰素分泌过程中发挥关键作用。转录因子IRF3作为关键接头分子,其活性受到多种翻译后修饰的严格调控,包括磷酸化、de SUMOylation、泛素化和乙酰化等。目前,关于TBK1介导的IRF3磷酸化如何驱动IRF3完全活化的文献... 详细信息

翻译后修饰在调节Ⅰ型干扰素分泌过程中发挥关键作用。转录因子IRF3作为关键接头分子,其活性受到多种翻译后修饰的严格调控,包括磷酸化、de SUMOylation、泛素化和乙酰化等。目前,关于TBK1介导的IRF3磷酸化如何驱动IRF3完全活化的文献报道非常有限。因此,了解IRF3磷酸化和活化状态之间的关联性具有重要的生理学意义。

关键词： Ⅰ型干扰素生理学意义翻译后修饰转录因子活化状态分泌过程文献报道泛素化

Field observation of wave overtopping at sea dike using shore-based video images

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2021年第4期33卷 657-672页

作者： Shan-hang Chi Chi Zhang Ti-ti Sui Zhu-bin Cao Jin-hai zheng Jiang-shan Fan State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjing210098China Key Laboratory of Ministry of Education for Coastal Disaster and Protection Hohai UniversityNanjing210098China College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing210098China Rizhao Port Group Co. Ltd.Rizhao276826China

Wave overtopping at a sea dike was observed using video images during a storm in July 2018 at Rizhao Coast,China.A shore-based video monitoring system was mounted to collect coastal images with a sample frequency of 1 Hz in the beginning 10 min of each hour during daylight.A method to extract the frequency,location,width and duration of individual overtopping events based on the shore-based video monitoring system was developed.A total of 6252 individual overtopping events were detected over a 360m long sea dike during the storm of 10 h in a safe and labor-saving way,enabling a detailed analysis of the temporal and spatial variation of wave *** temporal variation of overtopping duration,frequency and volume is basically in sync with the change of tidal level(R=0.87,0.82 and 0.76,respectively).The increase of wave height increases the overtopping frequency *** found a high correlation between the hourly observed data and the predicted results of two commonly used *** the previous field measurements of overtopping that were limited in a single location,significant spatial variation of overtopping in the alongshore direction is *** overtopping volume varies with a factor of 6 within the range of several wave *** is further revealed that the spatial variation of overtopping is highly correlated with the alongshore variation of surf zone width with a correlation coefficient of *** present study suggests the feasibility of shore-based video monitoring technique to capture the main features of wave overtopping at coastal dikes,providing new possibilities to monitor wave overtopping in the field and to improve prediction tools.

关键词： Wave overtopping coastal video monitoring field measurement temporal and spatial variations storm events

Cascade reaction-based fluorescent probe for detection of H2S with the assistance of CTAB micelles

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

Chinese Chemical Letters 2016年第12期27卷 1793-1796页

作者： hai-Rong zheng Li-Ya Niu Yu-Zhe Chen Li-Zhu Wu Chen-Ho Tung Qing-zheng Yang Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China College of Chemistry Beijing Normal University Beijing 100875 China University of the Chinese Academy of Sciences Beijing 100049 China

We report a turn-on fluorescent probe for H2S through a cascade reaction using a new trap group 4- （bromomethyl）benzoate, based on excited-state intramolecular proton transfer （ESIPT） sensing mechanism. The probe showed good selectivity and high sensitivity towards H2S and it was capable of detecting and imaging H2S in living HeLa cells, indicating its potential biological applications.

关键词： Hydrogen sulfide Fluorescent probe Cascade reaction ESIPT Micelles