检索结果-南通市图书馆

Visual Computing for Industry,Biomedicine,and Art 2018年第1期1卷 24-33页

作者： sen jiang Yingguang Li Changqing Liu College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjingChina

For thin-walled parts,uniform allowance to each machining surface is allocated by the traditional machining *** the sequence of the adjacent machining features,it may cause poor stiffness for some side walls due to a minor wall thickness,which may cause the deformation of the final formed parts to be large,or deduce machining efficiency for some machining features due to too thick *** order to address this issue,a non-uniform allowance allocation method based on interim state stiffness of machining features for the finishing of thin-walled structural parts is proposed in this *** this method,the interim state model of machining features is constructed according to the machining sequence of the parts,and the stiffness of the side wall is taken as the evaluation index to allocate reasonable allowance value to the corresponding machining surface to ensure the stiffness requirement of the parts in the machining *** to the finite element simulation results,the non-uniform allowance allocation method proposed in this paper can effectively improve the stiffness of the parts and reduce the deformation of the parts,when compared with the traditional uniform allowance machining method.

关键词： Machining features NC programming Interim state Non-uniform allowance Stiffness

Edge Effects on Growth of Ordered Stress Relief Patterns in Free Sustained Aluminum Films

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 Physics Letters 2010年第6期27卷 156-159页

作者： YU sen-jiang ZHANG Yong-Ju CHEN Miao-Gen Department of Physics China Jiliang University Hangzhou 310018 Department of Physics Taizhou University Linhai 317000 Department of Physics Zhejiang University Hangzhou 310027

An unusual form of ordered stress relief patterns is observed in a nearly free sustained aluminum film system deposited on liquid substrates by the therm^l evaporation method. The edge effects on the growth of the ordered patterns are systematically studied. It is found that the patterns initiate from the film edges, preexisting ordered patterns, or other imperfections of the film. When the patterns extend in the film regions, they decay gradually and finally disappear. If they develop along the boundaries, however, the sizes are almost unchanged over several millimeters. The stress relief patterns look like rectangular waves in appearance, which are proven to evolve from sinusoidal to triangular waves gradually. The morphological evolution can be well explained by the general theory of buckling of plates.

关键词： CRYSTAL growth STRESS relieving (Materials) METALLIC films ELECTROFORMING EVAPORATION (Chemistry) THERMAL analysis CRYSTAL grain boundaries

Porphyrin-based metal-organic framework nanocrystals for combination of immune and sonodynamic therapy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第7期16卷 9633-9641页

作者： sen jiang Congcong Liu Qijia He Kun Dang Weiwei Zhang Yang Tian Department of Chemistry Analytical Instrumentation CenterCapital Normal UniversityBeijing 10048China School of Life Science Capital Normal UniversityBeijing 10048China

Immune therapy based on programmed death-ligand 1(PD-L1)is widely used to treat human *** current strategies to improve immune checkpoint blockade therapy fail in rescuing increased expression of PD-L1 in tumor ***,we for the first time synthesized the metal-organic framework(MOF)nanocrystals of rare-earth element dysprosium(Dy)coordinated with tetrakis(4-carboxyphenyl)porphyrin(TCPP),which show well-defined two-dimensional *** MOF nanocrystals of Dy-TCPP could apparently reduce PD-L1 expression in tumor cells both in vitro and in vivo,and therefore display effective tumor treatment through immune therapy without any immune checkpoint inhibitor *** the sensitivity of TCPP ligand toward ultrasound,the prepared Dy-TCPP can also realize sonodynamic therapy(SDT)besides immune *** addition,the Dy-TCPP nanocrystals can efficiently obtain T_(2)-weight magnetic resonance imaging(MRI)of tumor *** study provides the Dy-TCPP nanocrystals as promising diagnostic MRI-guided platforms for the combined treatment on tumors with SDT and immune ***,this strategy succeeds in reducing the elevated expression of PD-L1 in tumor cells,which might serve as a novel avenue for tumor immunotherapy in future.

关键词： metal-organic frameworks(MOFs) nanosheet porphyrin immune therapy sonodynamic therapy(SDT)

Adaptive dynamic sliding mode control for space manipulator with external disturbance

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 Control and Decision 2019年第4期6卷 236-251页

作者： Jing Zhao sen jiang Fei Xie Xian Wang Zeyun Li School of Automation Nanjing University of Posts and TelecommunicationsNanjing 210023People’s Republic of China jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing Nanjing 210042People’s Republic of China School of Electrical and Automation Engineering Nanjing Normal UniversityNanjingPeople’s Republic of China

In this paper,a novel adaptive dynamic sliding mode control(ADSMC)methodology is developed for space manipulator control systems with external *** proposed ADSMC approach can make the systems stable and accurately track the desired signals in the presence of external ***,the simplified dynamic model of the manipulator is ***,the proposed adaptive dynamic sliding mode(ADSM)controller is given,which is proved to be able to guarantee high tracking accuracy via effectively estimating the disturbance ***,experimental results show that the dynamic sliding mode controller proposed in this paper can not only track the desired trajectory,but also present strong robustness for external disturbance,meanwhile effectively reduce the chattering phenomenon generated by switching between different sliding mode surfaces.

关键词： Manipulator adaptive sliding mode control external disturbance chattering phenomenon

Microstructural evolution and mechanical properties of a new Ni-based heat-resistant alloy during aging at 750℃

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 2017年第5期24卷 513-519页

作者： Zhong-liang Tian sen-bao jiang Zheng-zong Chen Han-sheng Bao Zheng-dong Liu Institute for Special Steels Central Iron and Steel Research Institute College of Material Science & Engineering Taiyuan Science & Technology University

Microstructural evolution and mechanical properties of a new candidate Ni-based heat-resistant alloy for advanced ultra-supercritical （A-USC） steam turbine rotors were investigated during aging at 750℃ up to 10000 h. The evolutions of γ＇ particles inside austenitic grain and M_23 C_6 carbides along grain boundaries were characterized according to their morphologies, distributions, and growth kinetics. Mean radius of the γ＇ spherical particles grew from 20.3 to 90.0 nm after aging for 10000 h, and;the corresponding coarse- ning behavior was conformed to the law of Lifschitz-Slyosovd-Wagner （LSW）. The weight fraction of γ＇ particles slightly increased from 10.0 to 12.0 wt. % after aging of long duration at 750 ℃.The Cr-rich M_23C_6 carbides discontinuously precipitated along grain boundaries, while other detrimental phases were not formed during the aging treatment, and hence the strength of grain boundary was enhanced by these discontinuously distributed carbides. The critical size of γ＇ had a direct influence on the maximum hardness of this alloy. Moreover, this alloy presented a good impact toughness for the safety after long time aging at high temperature.

关键词： Aging Precipitation Microstruetural evolution Mechanical property Heat-resistant alloy

The hard X-ray nanoprobe beamline at the SSRF

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第7期35卷 79-88页

作者： Yan He Hui jiang Dong-Xu Liang Zhi-sen jiang Huai-Na Yu Hua Wang Cheng-Wen Mao Jia-Nan Xie Ai-Guo Li Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai201210China

The hard X-ray nanoprobe beamline BL13U is a phase-Ⅱ beamline project at the Shanghai Synchrotron Radiation *** beamline aims to enable comprehensive experiments at high spatial resolutions ranging from 50 to 10 nm. The X-ray energy range of the beamline, 5–25 keV, can detect most elements in the periodic table. Two operating modes were designed to accommodate the experimental requirements of high-energy resolution or high photon flux, respectively. X-ray nanofluorescence, nanodiffraction, and coherent diffraction imaging are developed as the main experimental techniques for BL13U. This paper describes the beamline optics, end station configurations, experimental methods under development, and preliminary test results. This comprehensive overview aims to provide a clear understanding of the beamline capabilities and potential applications.

关键词： Shanghai synchrotron radiation facility Hard X-ray nanoprobe X-ray nanofocusing

Fabry–Prot resonance coupling associated exceptional points in a composite grating structure

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第5期27卷 209-214页

作者： Zhi-sen jiang De-Jiao Hu Lin Pang Fu-Hua Gao Ping Wang Key Laboratory of High Energy Density Physics and Technology of Ministry of Education Sichuan University Chengdu 610065 China College of Physical Science and Technology Sichuan University Chengdu 610065 China Guangdong Provincial Key Laboratory of Optical Fiber sensing and Communications Institute of Photonics Technology Jinan University Guangzhou 510632 China

The exceptional point（EP） is a significant and attractive phenomenon in an open quantum system. The scattering properties of light are similar to those in the open quantum system, which makes it possible to achieve EP in the optic system. Here we investigate the EP in a Fabry–P′erot（F–P） resonant coupling structure. The coupling between different types of F–P resonances leads to a near zero reflection, which results in a degeneration of eigenstates and thus the appearing of EP. Furthermore, the multi-wavelength EPs and unidirectional invisibility can be achieved which may be used in integrated photonics systems.

关键词： exceptional point Fabry-Perot resonance metallic grating

RECENT PROGRESS IN THE PROJECT OF SPACE SOLAR TELESCOPE

在线全文

学校读者我要写书评

暂无评论

空间科学学报 2002年第z1期22卷 21-28页

作者： JIN Shengzhen WANG sen YANG Shimo jiang Aimin SUN Caihong National Astronomical Observatory The Chinese Academy of Sciences Beijing 100012 P. R. China National Astronomical Observatory The Chinese Academy of Sciences Beijing 100012 P. R. China National Astronomical Observatory The Chinese Academy of Sciences Beijing 100012 P. R. China National Astronomical Observatory The Chinese Academy of Sciences Beijing 100012 P. R. China National Astronomical Observatory The Chinese Academy of Sciences Beijing 100012 P. R. China

In this paper, we introduce some process of the project of Space Solar Telescope in recent two years. The astronomic requirements have been further identified,the mission and operation requirements have been assessed, and some critical technologies have been performed. According to the time schedule, it is esti mated that the engineering model of the spacecraft would be completed and put into test operation in the end of 2004 and the spacecraft would be launched in about 2007.

关键词： Main telescope, Mechanics, Electronics

Clinical characteristics of pulmonary hypertension in bronchiectasis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Medicine 2016年第3期10卷 336-344页

作者： Lan Wang sen jiang Jingyun Shi Sugang Gong Qinhua Zhao Rong jiang Ping Yuan Bigyan Pudasaini Jing He Zhicheng Jing Jinming Liu Department of Cardio-Pulmonary Circulation Shanghai 200433 China Department of Radiology Shanghai Pulmonary Hospital Tongji University School of Medicine Shanghai 200433 China Thrombosis and Vascular Medicine Center State Key Laboratory of Cardiovascular Disease Fu Wai Hospital Peking Union Medical College and Chinese Academy of Medical Sciences Beijing 100037 China

Pulmonary hypertension （PH）, as a complication of bronchiectasis, is associated with increased mortality. However, hemodynamic characteristics and the efficacy of pulmonary arterial hypertension （PAH） therapies in patients with bronchiectasis and PH remain unknown. Patients with bilateral bronchiectasis and concurrent PH were included in the study. Patient characteristics at baseline and during follow-up, as well as survival, were analyzed. This observational study was conducted in 36 patients with a mean age of 51.5 years （range, 17-74 years）. The 6 min walking distance was 300.8 ± 93.3 m. The mean pulmonary arterial pressure （PAP） was 41.5 ± 11.7 mmHg, cardiac output was 5.2 ± 1.4 L/min, and pulmonary vascular resistance was 561.5 ± 281.5 ***-5. The mean PAP was 〉 35 mmHg in 75% of the cases. Mean PAP was inversely correlated with arterial oxygen saturation values （r = -0.45, P = 0.02）. In 24 patients who received oral PAH therapy, systolic PAP was reduced from 82.4 ±27.0 mmHg to 65.5 ± 20.9 mmHg （P = 0.025） on echocardiography after a median of 6 months of follow-up. The overall probability of survival was 97.1% at 1 year, 83.4% at 3 years, and 64.5% at 5 years. Given the results, we conclude that PH with severe hemodynamic impairment can occur in patients with bilateral bronchiectasis, and PAH therapy might improve hemodynamics in such patients. Prospective clinical trials focusing on this patient population are warranted.

关键词： bronchiectasis hemodynamics pulmonary hypertension

Common trunk of the right accessory renal artery and right inferior phrenic artery originating from the thoracic artery:An unreported variation

在线全文

学校读者我要写书评

暂无评论

Journal of Interventional Medicine 2021年第3期4卷 152-154页

作者： Lingling Li Bing Jie Dong Yu Xu Ma sen jiang Department of Radiology Shanghai Pulmonary HospitalTongji University School of Medicine507 Zhengmin RoadShanghai200433China

Accessory renal arteries(ARAs)are common and usually originate from the abdominal aorta and the renal *** phrenic arteries(IPAs)can also arise from the abdominal aorta or its *** this paper,we present the first case of a common trunk of the right ARA and right IPA arising from the thoracic artery at the level of T10,which was discovered by multidetector-row computed tomography in pretherapeutic evaluation and clearly confirmed by selective *** is important to recognize this anatomical variation when performing cardiovascular and interventional radiological procedures.

关键词： Renal artery Inferior phrenic artery Thoracic artery Anatomic variation