检索结果-南通市图书馆

Hard magnetic properties of melt-spun nanocomposite Y_(16)Fe_(78)B_(6)ribbons

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2023年第2期42卷 602-605页

作者： Liang Sun Kuo-She Li Hong-Wei Li Dun-Bo Yu Yang luo jin-Ling jin Shuo Lu Ning-tao Quan GRIREM Advanced Materials Ltd General Research Institute for Nonferrous MetalsBeijing100088China

Melt-spun Y_(16)Fe_(78)B_(6)ribbons were prepared by the melt-spinning technique with pure elements Y,Fe and Fe-B alloy n *** ribbons are mainly composed of Y_(2)Fe_(14)B,YFe_(2)andα-Fe *** phase appears at the wheel velocity of>35 m·s^(-1).For the ribbons prepared at optimum wheel velocity and heat treatments,the coercivity,remanence and maximum energy product are239.5 kA·m^(-1),0.61 T and 32.7 kJ·m-3,*** an investigation of Henkel plots of ribbons,it is found that intergrain exchange coupling leads to the enhancement of *** coercivity mechanism of ribbons prepared at 35 m·s^(-1)is mainly controlled by inhomogeneous pinning of domain *** phase component and magnetic properties change with annealing temperature and *** optimum magnetic properties are obtained with the ribbon quenched at 35 m·s^(-1)and annealed at 700℃for10 min.

关键词： Melt spinning Permanent magnets Y-Fe-B alloys Magnetic hardening

Numerical analysis on shock-cylinder interaction using immersed boundary method

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2017年第9期60卷 1423-1432页

作者： luo Kun luo YuJuan jin Tai FAN JianRen State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 China

The problem of shock interaction with a rigid circular cylinder has been investigated using a compressible immersed boundary method coupled with high-order weighted-essentially non-oscillatory(WENO) ***,the accuracy of the developed code is ***,influences of the incident shock Mach number on the flow-field structure and dynamic drag coefficient,as well as time evolution of the flow field are *** different shock Mach number,the flow structure shows very different *** a given dimensionless time,both the normalized shock detachment distance and the normalized vertical distance from the highest point of the primary reflected shock to the centerline of the cylinder decreases with increasing shock Mach ***,location of the upper triple point varies non-monotonically with shock Mach *** a case with given shock Mach number,the trajectory of the upper triple point and the time evolution of the normalized vertical distance from the highest point of the primary reflected shock to the centerline of the cylinder can both be predicted by linear ***,the time evolution of the normalized shock detachment distance is biased to be ***,time evolution of force exerted on the cylinder is quite unsteady for a case with given shock Mach number and given cylinder *** small shock Mach number,there exists a negative valley,and it disappears when the incident shock Mach number increases to a large value,e.g.,***,correlations to predict the occurrence of the peak drag and its value under different shock Mach numbers have been proposed.

关键词： shock-cylinder interaction immersed boundary method shock Mach number flow structure unsteady force

Microstructure and Mechanical Properties of Tortoise Carapace Structure Bio-Inspired Hybrid Composite

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2018年第9期31卷 945-952页

作者： Bao-Shuai Han Yan-jin Xu En-Yu Guo tao jing Hong-Liang Hou Liang-Shun luo AVIC Manufacturing Technology Institute BeijingBeijing 100024China School of Materials Science and Engineering HarbinInstitute of TechnologyHarbin 150001China School of Materials Science and Engineering DalianUniversity of TechnologyDalian 116024China School of Materials Science and Engineering TsinghuaUniversityBeijing 100084China

A turtle carapace bio-inspired Ti matrix hybrid composite was successfully fabricated in this work. This composite incorporates two parts： the Ti-Al intermetallic multilayered composite and continuous SiC fibers-reinforced Ti matrix composite. In the Ti-Al intermetallic multilayered composite part, a series of Ti-Al intermetallics compounds, including Ti3Al, TiAl, TiAl2 and TiAl3, were formed between the Ti layers. In the continuous SiC fibers-reinforced Ti matrix composite part, SiC fibers and Ti matrix were found to be bonded well through weak interface reaction. Flexural strength of this material reached 1.21 ±0.16 GPa, measured by three-point bending test. The deformation features suggest that the hierarchical structure combining ductile Ti layers/matrix with brittle high-strength Ti-Al intermetallics layers/SiC fibers can effectively enhance the mechanical properties of the bio-inspired hybrid composite.

关键词： Bio-inspired composite Hierarchical structure Cracks propagation Flexural property

TOFD detection of shallow subsurface defects in aluminum alloy thin plates by half-skip mode-converted wave

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第6期37卷 454-463页

作者： Shijie jin Zhicheng WANG Zhongbing luo NDT&E Laboratory Dalian University of TechnologyDalian 116085China

Aluminum alloy is widely applied to the aerospace ***,the inspection of thin plates using Time-of-Flight Diffraction(TOFD)technique is restricted by the near-surface dead zone because of the coupling between diffracted longitudinal wave and lateral *** halfskip mode-converted wave is introduced to decrease dead zone and detect defects in aluminum alloy thin plates by increasing ray path and propagation *** quantitative correlation for the diffracted shear wave from longitudinal back-wall wave is deduced in combination with the acoustic path,realizing the accurate location of shallow subsurface *** and experimental results indicate that the dead zone is decreased by 38% by the half-skip mode-converted wave,and the location errors are within 5% for the aluminum alloy plate with a thickness of 7.0 *** to other alternative TOFD techniques,half-skip mode-converted wave has better response amplitude and positioning accuracy,demonstrating strong applicability in TOFD inspection of thin plates.

关键词： Ultrasonic testing Time-of-Flight Diffraction(TOFD) Dead zone Half-skip mode-converted wave Quantitative detection

Neural Dynamics for Distributed Collaborative Control of Manipulators With Time Delays

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2022年第5期9卷 854-863页

作者： Long jin Xin Zheng Xin luo School of Information Science and Engineering Lanzhou UniversityLanzhou 730000 IEEE State Key Laboratory of Integrated Services Networks Xidian UniversityXi’an 710071China School of Computer Science and Technology Chongqing University of Posts and TelecommunicationsChongqing 400065 Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714China

Time-delay phenomena extensively exist in practical systems,e.g.,multi-agent systems,bringing negative impacts on their *** work analyzes a collaborative control problem of redundant manipulators with time delays and proposes a time-delayed and distributed neural dynamics *** assumptions that the network topology is fixed and connected and the existing maximal time delay is no more than a threshold value,it is proved that all manipulators in the distributed network are able to reach a desired *** proposed distributed scheme with time delays considered is converted into a time-variant optimization problem,and a neural dynamics solver is designed to solve it ***,the proposed neural dynamics solver is proved to be stable,convergent and ***,the allowable threshold value of time delay that ensures the proposed scheme’s stability is *** examples and comparisons are provided to intuitively prove the validity of the proposed neural dynamics scheme and solver.

关键词： Distributed collaborative control neural dynamics redundancy resolution repetitive motion planning(RMP) time delay

Cucurbitacin B suppresses metastasis mediated by reactive oxygen species(ROS) via focal adhesion kinase(FAK) in breast cancer MDA-MB-231 cells

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Natural Medicines 2018年第1期16卷 10-19页

作者： luo Wei-Wei ZHAO Wen-Wen LU jin-Jian WANG Yi-tao CHEN Xiu-Ping State Key Laboratory of Quality Research in Chinese Medicine Institute of Chinese Medical Science University of Macao

Metastasis is responsible for the majority of cancer-related deaths and prevention of metastasis remains a big challenge for cancer therapy. Cucurbitacin B(Cuc B) is a natural triterpenoid with potent anticancer activities while its effect on metastasis remains unclear. In the present study, the inhibitory effect and mechanisms of Cuc B on metastasis were investigated in MDA-MB-231 breast cancer cells. The cells were treated with or without Cuc B, and the cytotoxicity was determined by MTT assay. The effect of Cuc B on metastasis was evaluated with wound healing, transwell, and adhesion assays. Furthermore, the adhesion of cancer cells to endothelial cells was determined. The protein expression was determined by Western blotting. Cuc B(< 100 nmol·L~^(-1)) showed no obvious cytotoxicity to MDA-MB-231 cells, but significantly inhibited migration, invasion, and adhesion to Matrigel, fibronectin, type I collagen, and endothelial cells. Cuc B dramatically inhibited the phosphorylation of focal adhesion kinase(FAK) and paxillin in dose-and time-dependent manners. Furthermore, Cuc B induced intracellular reactive oxygen species(ROS) generation, which could be reduced by N-acetyl-l-cysteine(NAC). In addition, NAC pretreatment could reverse Cuc B-induced suppression of migration and adhesion, expression of FAK, but showed no effect on paxillin expression. In summary, Cuc B suppressed ROS-dependent metastasis through FAK pathway in breast cancer MDA-MB-231 cells, demonstrating novel mechanisms for the anticancer effects of Cuc B.

关键词： Cucurbitacin B Metastasis ROS FAK Breast Cancer

High catalytic activity for formaldehyde oxidation of an interconnected network structure composed of δ-MnO_(2) nanosheets and γ-MnOOH nanowires

在线全文

学校读者我要写书评

暂无评论

Advances in Manufacturing 2020年第4期8卷 429-439页

作者： Ying tao Rong Li Ai-Bin Huang Yi-Ning Ma Shi-Dong Ji Ping jin Hong-Jie luo State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050.People's Republic of China Institute for the Conservation of Culture Heritage Shanghai UniversityShanghai 200444.People's Republic of China University of Chinese Academy of Sciences Beijing 100049People's Republic of China Department of Criminal Science and Technology Jiangsu Police InstituteNanjing 210031People's Republic of China

Among the transition metal oxide catalysts,manganese oxides have great potential for formaldehyde(HCHO)oxidation at ambient temperature because of their high activity,nontoxicity,low cost,and polybasic *** this work,a MnO_(2)-based catalyst(M-MnO_(2))with an interconnected network structure was successfully synthesized by a one-step hydrothermal *** M-MnO_(2) catalyst was composed of the main catalytic agent,δ-MnO_(2) nanosheets,dispersed in a nonactive framework material of γ-MnOOH *** catalytic activity of M-MnO_(2) for HCHO oxidation at room temperature was much higher than that of the pure δ-MnO_(2) *** is attributed to the special interconnected network *** special interconnected network structure has high dispersion and specific surface area,which can provide more surface active oxygen species and higher surface hydroxyl groups to realize rapid decomposition of HCHO.

关键词： MnO_(2) Formaldehyde Catalytic oxidation Hydrothermal synthesis

Sustainable preparation of graphene-analogue boron nitride by ball-milling for adsorption of organic pollutants

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 Journal of Chemical Engineering 2022年第2期35卷 73-81页

作者： Haofeng Wu Yanhong Chao Yan jin Duanjian tao Xiaowei Li jing luo Guohua Xia Linhua Zhu Wenshuai Zhu School of Pharmacy Jiangsu UniversityZhenjiang 212013China College of Chemistry and Chemical Engineering Jiangxi Normal UniversityNanchang 330022China School of Chemistry and Chemical Engineering Jiangsu UniversityZhenjiang 212013China Key Laboratory of Tropical Medicinal Plant Chemistry of Education Hainan Normal UniversityHaikou 571158China

The method of fabricating low-cost adsorbents with high activity and durability via a convenient and ecofriendly procedure is of great importance to wastewater treatment. Herein, a high-efficient mechanical exfoliation strategy was proposed to facilely prepare few-layered graphene-analogue boron nitride(BN) via a one-step non-organic solvent assisted wet ball mill procedure. Ball-milling treatment increased the specific surface area of BN 3.5-fold by reducing the thickness to ~3 layers with 45 min. The exfoliated BN exhibited strikingly improved sorption performance to organic contaminants with around 124% and 116% increased removal efficiency respectively for oxytetracycline(OTC) and Rhodamine B(RhB) as compared to the bulk BN. Batches sorption experiments showed that the sorption processes were thermodynamic endothermic, and well fitted to pseudo-second-order kinetic model and Freundlich isotherm equation. The π-π stacking interaction, hydrophobic effect and electrostatic interaction were proposed as the dominated sorption mechanism. In addition, no significant decline in adsorptive removal ability for the sorbent after 5 times recycling. The results indicate that the ball-milling exfoliation is a fast, green,sustainable and promising strategy for synthesis of highly potent BN based two-dimensional layered adsorbents.

关键词： Boron nitride Ball mill Exfoliation Adsorption Water treatment

健全全面从严治党体系:基本概念、内在要素与实践路径

在线全文

学校读者我要写书评

暂无评论

学习论坛 2025年第1期 25-32页

作者：罗星中国纪检监察学院党建教研部北京100877

全面从严治党体系是一个由诸多要素按照一定结构形成的复杂整体,是管党治党各领域各方面相互贯通、有机结合形成的体系。全面从严治党体系生成于中国共产党管党治党的具体实践中,具有理论基础深厚性、参与主体多元性、任务布局全面性、... 详细信息

全面从严治党体系是一个由诸多要素按照一定结构形成的复杂整体,是管党治党各领域各方面相互贯通、有机结合形成的体系。全面从严治党体系生成于中国共产党管党治党的具体实践中,具有理论基础深厚性、参与主体多元性、任务布局全面性、治理过程常态性、方法路径多样性的特点。新时代全面从严治党体系包含了组织体系、教育体系、监管体系、制度体系、责任体系五大部分。“五大体系”相互联系、有机贯通,明确了全面从严治党的基本内容、重点领域与内在逻辑。健全全面从严治党体系,要坚持和加强党的全面领导,持续深化党的建设制度改革,在铲除腐败滋生土壤和条件上下更大功夫,丰富全面从严治党体系的理念方法和工作机制,加强对全面从严治党体系的学理阐释。

关键词：全面从严治党体系监督责任党的领导