检索结果-南通市图书馆

Effects of heat treatment on microstructures and properties of a heterostructured alloy with dissimilar components fabricated by WAAM

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第9期43卷 4441-4461页

作者： Ming-Cai Pan Jun-Qiang Xu Yong peng Ning-Ning Liang Si Lan Qi Zhou ke-Hong Wang School of Materials Science and Engineering Nanjing University of Science and Technology key Laboratory of Controlled Arc Intelligent Additive Manufacturing Technology

Heat treatment significantly influences homogeneous material microstructures and mechanical properties, which can be improved by an optimal heat treatment process. However, heat treatment application to heterogeneous materials presents significant challenges due to compositional and microstructural heterogeneities. Herein,a laminated heterostructured alloy comprising alternating316L stainless steel（SS） and 18Ni300 maraging steel（MS）layers fabricated using wire and arc additive manufacturing was investigated. A solution treatment was applied at900 °C for 0.5 h. Subsequently, the solution-treated and asfabricated（AF） samples were aged at 500 °C for 4 h; these samples were denoted SA and AT, respectively. The AT phase compositions and orientations were similar to those of AF. The SA 316L SS layer resembled that of AF, but the SA 18Ni300 MS layers exhibited a reduced austenite phase fraction and refined grain size, attributable to solid-state transformation. In the AT sample, aging induced the formation of nanoscale acicular ω phase and ellipsoidal Ni3Ti,Fe2Mo, and X precipitates in the 18Ni300 MS ***, the SA precipitates contained acicular Fe Ni2and ellipsoidal ω, Ni3Ti, and X precipitates, and their fractions were lower than those in AT precipitates. The18Ni300 MS layer microhardness in the heat-treated samples increased due to nanoprecipitation, but the 316L SS layer microhardness resembled that of AF. The AT and SA ultimate tensile strengths increased to（1360 ± 50） and（1473 ± 41） MPa, respectively, attributable to precipitation strengthening. The SA 316L SS layer exhibited a high stress-induced martensite fraction, enhancing the ductility of heated samples.

关键词： Heat treatment Laminated heterostructured alloy Mechanical property Microstructure Wire and arc additive manufacturing

Remote sensing of air pollution incorporating integrated-path differential-absorption and coherent-Doppler lidar

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第1期31卷 594-601页

作者： Ze-hou Yang Yong Chen Chun-li Chen Yong-ke Zhang Ji-hui Dong Tao peng Xiao-feng Li Ding-fu Zhou School of Physics Beijing Institute of TechnologyBeijing 100081China Southwest Institute of Technical Physics Chengdu 610041SichuanChina School of Optics and Photonics Beijing Institute of TechnologyBeijing 100081China

An innovative complex lidar system deployed on an airborne rotorcraft platform for remote sensing of atmospheric pollution is proposed and *** system incorporates integrated-path differential absorption lidar(DIAL) and coherent-doppler lidar(CDL) techniques using a dual tunable TEA CO_(2)laser in the 9—11 μm band and a 1.55 μm fiber *** combining the principles of differential absorption detection and pulsed coherent detection,the system enables agile and remote sensing of atmospheric *** static tests validate the system’s real-time detection capabilities,including the measurement of concentration-path-length product(CL),front distance,and path wind speed of air pollution plumes over long distances exceeding 4 *** experiments is conducted with the *** of the pollutant concentration and the wind field is carried out in an approximately 1 km slant range over scanning angle ranges from 45°to 65°,with a radial resolution of 30 m and10 *** test results demonstrate the system’s ability to spatially map atmospheric pollution plumes and predict their motion and dispersion patterns,thereby ensuring the protection of public safety.

关键词： Differential absorption LIDAR Coherent Doppler lidar Remoting sensing Atmospheric pollution

Current control for a shunt hybrid active power filter using recursive integral PI

在线全文

学校读者我要写书评

暂无评论

控制理论与应用（英文版） 2009年第1期7卷 77-80页

作者： Wei ZHAO An LUO ke peng Xia DENG College of Electrical and Information Engineering Hunan University Changsha Hunan 410082 China

This paper presents a current control method for a shunt hybrid active power filter （HAPF） using recursive integral PI algorithm. The method improves the performance of the HAPF system by reducing the influence of detection accuracy, time delay of instruction current calculation and phase displacement of output filter. Fuzzy logic based set-point weighing algorithm is combined in the control scheme to enhance its robustness and anti-interference ability. The proposed algorithm is easy to implement for engineering applications and easy to compute. Experiment results have verified the validity of the proposed controller. Furthermore, the proposed recursive integral PI algorithm can also be applied in the control of periodic current as in AC drivers.

关键词： Power electronics Shunt hybrid active power filter Recursive integral PI Fuzzy inference

在线全文

学校读者我要写书评

暂无评论

近现代西藏民用航空建设发展研究综述

西藏研究 2022年第6期197卷 134-142页

作者：彭科中国民用航空飞行学院新津分院四川成都611431

自近代以来,西藏民航的建设与发展倍受中央和地方政府的关注重视。因受各种不利因素影响,西藏民航的建设与发展虽然已经取得举世瞩目的辉煌成就,但改革开放前关于西藏民航建设与发展的记述、研究资料数量稀少,内容有限,改革开放后有关... 详细信息

自近代以来,西藏民航的建设与发展倍受中央和地方政府的关注重视。因受各种不利因素影响,西藏民航的建设与发展虽然已经取得举世瞩目的辉煌成就,但改革开放前关于西藏民航建设与发展的记述、研究资料数量稀少,内容有限,改革开放后有关记叙和研究才渐趋多元且日益繁荣。

关键词：近现代西藏民航建设发展文献

基于“形神一体”理论针刺治疗中风后痉挛性偏瘫的体会

在线全文

学校读者我要写书评

暂无评论

中医康复 2024年第4期1卷 58-61页

作者：兰玉娟王隐羽杨硕廖越司元红彭克江刘明辉贵州中医药大学贵州贵阳550003 贵州中医药大学第二附属医院贵州贵阳550003

痉挛性偏瘫是中风后常见的后遗症,其发生关键在于毒邪损伤元神、残害形体,属于“形神共病”之疾病,治疗上需“形”“神”同调。吾师刘明辉医师在“形神一体”理论指导下总结了针刺治疗中风后痉挛性偏瘫的处方,即调神取背部夹脊穴(双侧1... 详细信息

痉挛性偏瘫是中风后常见的后遗症,其发生关键在于毒邪损伤元神、残害形体,属于“形神共病”之疾病,治疗上需“形”“神”同调。吾师刘明辉医师在“形神一体”理论指导下总结了针刺治疗中风后痉挛性偏瘫的处方,即调神取背部夹脊穴(双侧1、3、5、7、9、11、13、15、17与2、4、6、8、10、12、14、16,两组穴位隔日交替使用)+头针(病灶同侧)顶颞前斜线中2/5、顶颞后斜线中2/5、顶旁2线行针刺;调形取患肢拮抗肌筋节点行小针刀,取得了良好的疗效。本文总结刘明辉医师的临床经验,以期为临床治疗中风后痉挛性偏瘫提供新思路。

关键词：中风痉挛性偏瘫形神一体针刺

在线全文

学校读者我要写书评

暂无评论

农村医养结合国家给付义务的立法优化

南方金融 2023年第6期 72-85页

作者：彭科湖南师范大学法学院湖南长沙410081 湖南中医药大学马克思主义学院湖南长沙410208

农村医养结合是一种创新型养老模式,能有效应对老年人医疗服务和生活照顾叠加的需求。国家应当积极承担给付义务,以此推进农村医养结合事业发展。农村医养结合国家给付义务立法是农村老年人医养权利的根本保障。然而,现行农村医养结合... 详细信息

农村医养结合是一种创新型养老模式,能有效应对老年人医疗服务和生活照顾叠加的需求。国家应当积极承担给付义务,以此推进农村医养结合事业发展。农村医养结合国家给付义务立法是农村老年人医养权利的根本保障。然而,现行农村医养结合国家给付义务的立法存在缺陷,在基地设施建设、财政资金投入、基本服务供给等方面的国家给付义务条款过于笼统,在法律制度供给、组织体系建设、配套程序设置等方面的国家给付义务构造不够完备。下一步,可从目的性和手段性两个方面优化农村医养结合国家给付义务法律体系。一方面,明确国家给付义务的立法指向,厘定其良法生成要义、立法价值取向及规范目标。另一方面,完善具体立法内容,健全手段性农村医养结合国家给付义务规范机制,以切实保障农村老年人医养权利。

关键词：人口老龄化医养结合养老保险医疗保险护理保险

Multiple Roles of HIV-1 Capsid during the Virus Replication Cycle

在线全文

学校读者我要写书评

暂无评论

Virologica Sinica 2019年第2期34卷 119-134页

作者： Mariia Novikova Yulan Zhang Eric O. Freed ke peng Virus-Cell Interaction Section HIV Dynamics and Replication Program Center for Cancer Research National Cancer Institute Frederick MD 21702 USA State key Laboratory of Virology Wuhan Institute of Virology Chinese Academy of Sciences Wuhan 430071 China

Human immunodeficiency virus-1 capsid(HIV-1 CA) is involved in different stages of the viral replication cycle. During virion assembly, CA drives the formation of the hexameric lattice in immature viral particles, while in mature virions CA monomers assemble in cone-shaped cores surrounding the viral RNA genome and associated proteins. In addition to its functions in late stages of the viral replication cycle, CA plays key roles in a number of processes during early phases of HIV-1 infection including trafficking, uncoating, recognition by host cellular proteins and nuclear import of the viral preintegration complex. As a result of efficient cooperation of CA with other viral and cellular proteins, integration of the viral genetic material into the host genome, which is an essential step for productive viral infection, successfully occurs. In this review, we will summarize available data on CA functions in HIV-1 replication, describing in detail its roles in late and early phases of the viral replication cycle.

关键词： Human immunodeficiency virus-1 (HIV-1) Capsid (CA) Assembly Post entry Uncoating and nuclear import Inhibitor

Preparation of spherical spinel LiCr_(0.04)Mn_(1.96)O_4 cathode materials based on the slurry spray drying method

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2009年第6期28卷 618-623页

作者： JIANG Qinglai HU Guorong peng Zhongdong DU ke CAO Yanbing TANG Daichun School of Metallurgical Science and Engineering Central South University Changsha 410083 China

Regular spherical chromium doped spinel lithium manganese oxides （LiCr0.04Mn1.96O4） with an average particle size of about 20μm were prepared by the slurry spray drying process. The materials were compared with non-spherical LiCr0.04Mnl.96O4 materials prepared by the common drying process, and all materials were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, laser particle analyzer and Brunaner-Emmett-Teller （BET） specific surface area test. Electrochemical performances of these cathode materials were studied by cyclic voltammetry （CV）, electrochemical impedance spectroscopy （EIS） and Li/LiCr0.04Mn1.9604 battery test. The results show that the spherical active material is single spinel structure, compact, and with narrow particle size distribution and low BET specific surface area. Compared with the non-spherical material, the spherical material prepared by the spray drying process shows a lower electrochemical impedance, a fewer electrochemical polarization and a better charge/discharge rate capability and capacity retention at elevated temperatures.

关键词： lithium-ion battery spinel LiMn2O4 spray drying chromium doping

Geographic Variations in the Prevalence,Awareness,Treatment,and Control of Dyslipidemia among Chinese Adults in 2018–2019:A Cross-sectional Study

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2023年第4期36卷 313-323页

作者： ZHANG Mei peng ke ZHANG Xiao LIU Yi Shu LIU Xiao Ying HAN Gui Yuan SHI Yu HUANG Zheng Jing LI Chun ZHAO Zhen Ping WANG Li Min LI Yi Chong National Center for Chronic and Non-communicable Disease Control and Prevention Chinese Center for Disease Control and PreventionBeijing 100050China National Clinical Research Center for Cardiovascular Diseases ShenzhenFuwai Hospital Chinese Academy of Medical SciencesShenzhen 518057GuangdongChina The George Institute for Global Health 2042New South WalesAustralia School of Medical Science Faculty of Medicine and HealthUniversity of Sydney2006New South WalesAustralia

Objective To investigate the spatial patterns of the prevalence,awareness,treatment,and control rates of dyslipidemia at the provincial level in *** A national and provincial representative cross-sectional survey was conducted among 178,558 Chinese adults in 31 provinces in China's Mainland in 2018–2019,using a multi-stage,stratified,cluster-randomized sampling ***,as households,were selected,followed by a home visit to collect *** descriptive and linear regression procedures were applied in the *** The overall prevalence of dyslipidemia was 35.6%,and wide geographic variations of prevalence,treatment,and control rates of dyslipidemia were identified among 178,558 eligible participants with a mean age of 55.1±13.8 *** highest-lowest difference regarding the provincial level prevalence rates were 19.7%vs.2.1%for high low-density lipoprotein cholesterol,16.7%vs.2.5%for high total cholesterol,35.9%vs.5.4%for high triglycerides,and 31.4%vs.10.5%for low high-density lipoprotein *** treatment rate of dyslipidemia was correlated with the socio-demographic index(P<0.001),urbanization rate(P=0.01),and affordable basic technologies and essential medicines(P<0.001).Conclusion Prevailing dyslipidemia among the Chinese population and its wide geographic variations in prevalence,treatment,and control suggest that China needs both integrated and localized public health strategies across provinces to improve lipid management.

关键词： Lipids management Dyslipidemia Public health Chinese