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Application of tellurium in free-cutting steels

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Journal of Iron and Steel Research International 2018年第8期25卷 787-795页

作者： ping Shen Qian-kun Yang Dong Zhang Yan-xin Wu Jian-xun Fu State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced Ferrous Metallurgy School of Materials Science and Engineering Shanghai UniversityShanghai 200444 China Institute of Material Science and Engineering National Taiwan University Taipei 10617 Taiwan China

Te is widely used in iron and steel industry. After adding a certain amount of Te in the steel, many physical and chemical properties can be improved. As a free-cutting element, a small amount of Te can significantly improve the machinability of steel. The existing form of Te in the steel, the modification law of MnS inclusion by Te and the influence rule and mechanism of Te on the machinability of steel are summarized and expounded in detail, providing a reference for further study and development of Te-containing free-cutting steels.

关键词： Tellurium - Inclusion Sulfide modification Free-cutting steel

Optimized in vivo performance of acid-liable micelles for the treatment of rheumatoid arthritis by one single injection

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Nano Research 2019年第2期12卷 421-428页

作者： Qin Wang Yan Li Xiaoyan Chen Hao jiang Zhirong Zhang xun Sun Key Laboratory of Drug Targeting and Drug Delivery Systems Ministry of Education West China School of Pharmacy Sichuan University Chengdu 610041 China

Current therapeutic limitations existed in effective treatment of rheumatoid arthritis (RA) have motivated numerous researches on finding new *** to the non-targeted distribution and uncontrollable in vivo performance which hinder the effective treatment for RA,we designed an acid-responsive polymeric micelle formulation by attaching the dexamethasone (Dex) to the side chains of a wheat-like polyethylene glycol (PEG) derivate via a hydrazone *** self-assembly micelles with the diameter around 50 nm could passively migrate to inflamed *** presence of hydrazone linkers avoided the drug leakage in circulation and ensured the preferential release in acidic arthritic ***,we evaluated how the polymer-drug micelles with different density of drug payloads influenced the release pattem,pharmacokinetics and biodistribution,as well as the most importantly,the duration of the therapeutic *** exploration would offer the chemical and structural basis for designing and optimizing the nanocarriers for enhanced therapeutic efficacy.

关键词： rheumatoid arthritis pH-responsive micelles dexamethasone

Prospects of fuel cell technologies

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National Science Review 2017年第2期4卷 163-166页

作者： Shuangyin Wang San ping jiang State Key Laboratory of Chem/Bio-Sensing and Chemometrics College of Chemistry and Chemical EngineeringHunan University Fuels and Energy Technology Institute and Department of Chemical Engineering Curtin University

Fuel cells(FCs) are efficient and clean devices to electrochemically convert the chemical energy of fuels such as hydrogen,natural gas(NG),methanol,ethanol and hydrocarbons to electric energy with significantly high e... 详细信息

关键词： cell Prospects of fuel cell technologies PAFC PEMFC

Measurement feedback control of nonlinear systems:a small-gain approach

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Journal of Control and Decision 2020年第1期7卷 64-89页

作者： Tengfei Liu Zhong-ping jiang State Key Laboratory of Synthetical Automation for Process Industries Northeastern UniversityShenyang 110004People’s Republic of China Department of Electrical and Computer Engineering New York UniversityBrooklynNYUSA

This paper presents a new tool for feedback control design of nonlinear systems in the presence of non-smooth measurement *** introduce a small-gain design approach to robust control of nonlinear uncertain systems with disturbed *** a design ingredient,a modified gain assignment technique for measurement feedback control of nonlinear uncertain systems is *** a recursive control design approach,the closed-loop system is transformed into a network of input-to-state stable(ISS)systems and the influences of the measurement errors are represented by ISS *** feedback control objective is achieved by applying the cyclic-small-gain theorem to the closed-loop ***,event-triggered control of nonlinear systems is studied in a unified framework of measurement feedback control.

关键词： Nonlinear systems measurement error nonlinear small-gain theorem input-to-state stability

Analysis on composition and inclusions of ballpoint pen tip steel

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International Journal of Minerals,Metallurgy and Materials 2018年第4期25卷 420-428页

作者： Qian-kun Yang ping Shen Dong Zhang Yan-xin Wu Jian-xun Fu State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced Ferrometallurgy School of Materials Science and Engineering Shanghai University

Ballpoint pen tip steel, a super free-cutting stainless steel, exhibits excellent corrosion resistance and good machining properties. In this study, inductively coupled plasma spectroscopy, metallographic microscopy, and scanning electron microscopy were used to determine the elemental contents in five ballpoint pen tips and their components, morphologies, and inclusion distributions. The results showed that the steels were all S–Pb–Te super free-cutting ferritic stainless steel. The free-cutting phases in the steels were mainly Mn S, Pb, and small amounts of Pb Te. Mn S inclusions were in the form of chain distributions, and the aspect ratio of each size inclusion in the chain was small. The stress concentration effect could substantially reduce the cutting force when the material was machined. Some of the Pb was distributed evenly in the steel matrix as fine particles（1–2 μm）, and the rest of the Pb was distributed at the middle or at both ends of the Mn S inclusions. The Pb plays a role in lubrication and melting embrittlement, which substantially increases the cutting performance. Pb Te was also usually distributed in the middle and at both ends of the Mn S inclusions, and Te could convert the sulfides into spindles, thereby improving the cutting performance of the steel.

关键词： ballpoint pen tip free-cutting stainless steel inclusions lead tellurium

Recent advances in bioinspired vision systems with curved imaging structures

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Rare Metals 2024年第4期43卷 1407-1434页

作者： Ze-ping He xun Han Wen-Qiang Wu Zhang-Sheng Xu Cao-Feng Pan CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing100083China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing100049China ZJU-Hangzhou Global Scientific and Technological Innovation Center School of Micro-Nano ElectronicsZhejiang UniversityHangzhou311200China Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen518060China

Limited by the planar imaging structure,the commercial camera needs to introduce additional optical elements to compensate for the curved focal plane to match the planar image *** results in a complex and bulky *** contrast,biological eyes possess a simple and compact structure due to their curved imaging structure that can directly match with the curved focal *** by the structures and functions of biological eyes,curved vision systems not only improve the image quality,but also offer a variety of advanced ***,we review the recent advances in bioinspired vision systems with curved imaging ***,we focus on their applications in implementing different functions of biological eyes,as well as the emerging curved neuromorphic imaging systems that incorporate bioinspired optical and neuromorphic processing *** addition,the challenges and opportunities of bioinspired curved imaging systems are also discussed.

关键词： Bioinspired Curved vision system Compound eye Chambered eye Neuromorphic

Nano-scale compositional oscillation and phase intergrowth in Cu_(2)S_(0.5)Se_(0.5) and their role in thermal transport

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Journal of Materials Science & Technology 2021年第20期79卷 222-229页

作者： Yuyu Wei ping Lu Chenxi Zhu Kunpeng Zhao xun Shi Lidong Chen Fangfang Xu State Key Laboratory of High Performance Ceramics and Superfine Microstructures Shanghai Institute of CeramicsChinese Academy of Sciences(CAS)Shanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Solid solution alloying is a promising strategy to establish high performance *** alloying different elements,phase structures and phase compositions may vary accompanied by appearance of variety of interesting microstructures including mass fluctuation,lattice strain,nano-scale defects and spinodal decomposition,all of which may greatly influence the electrical and specifically the thermal transport of the *** the present study,atomic structures of Cu_(2)S_(0.5)Se_(0.5) solid solution have been examined by using atom-resolved electron microscopy in order to investigate the structure-correlated physical insights for the abnormal thermal transport in this solid *** the exceptional intergrowth nanostructures were *** solid solution consists of two high symmetrical phases,*** hexagonal and cubic phase,which alternately intergrow to form highly oriented ultra-thin lamellae of nano or even,unit cell *** compositional oscillation in Se/S atomic ratio during alloying is responsible for the phase stability and intergrowth *** unique binary phase intergrowth nanostructures make great contribution to the ultra-low lattice thermal conductivity comparable to glass and extremely short phonon mean free path of only 1.04Å,peculiar continuous hexagonal-to-cubic structural transformation without a critical transition temperature and its corresponding abnormal changes of thermal characters with *** present study further evokes the unlimited possibilities and potentials for tailoring nanostructures by alloying for improved thermoelectric performance.

关键词： Thermoelectric Solid solution Intergrowth nanostructures Compositional oscillation Structural transformation Thermal transport

A Planning Method for Operational Test of UAV Swarm Based on Mission Reliability

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Computer Modeling in Engineering & Sciences 2024年第8期140卷 1889-1918页

作者： Jingyu Wang ping jiang Jianjun Qi College of Systems Engineering National University of Defense TechnologyChangsha410073China Beijing Special Engineering Design Institution Beijing100028China

The unmanned aerial vehicle(UAV)swarm plays an increasingly important role in the modern battlefield,and the UAV swarm operational test is a vital means to validate the combat effectiveness of the UAV *** to the high cost and long duration of operational tests,it is essential to plan the test in *** solve the problem of planning UAV swarm operational test,this study considers the multi-stage feature of a UAV swarm mission,composed of launch,flight and combat stages,and proposes a method to find test plans that can maximize mission ***,a multi-stage mission reliability model for a UAV swarm is proposed to ensure successful implementation of the mission.A multi-objective integer optimization method that considers both mission reliability and cost is then formulated to obtain the optimal test *** study first constructs a mission reliability model for the UAV swarm in the combat ***,the launch stage and flight stage are integrated to develop a complete PMS(Phased Mission Systems)reliability ***,the Binary Decision Diagrams(BDD)and Multi Objective Quantum Particle Swarm Optimization(MOQPSO)methods are proposed to solve the *** optimal plans considering both reliability and cost are *** proposed model supports the planning of UAV swarm operational tests and represents a meaningful exploration of UAV swarm test planning.

关键词： UAV swarm PMS MOQPSO BDD mission reliability operational test planning

Zero-bit watermarking resisting geometric attacks based on composite-chaos optimized SVR model

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The Journal of China Universities of Posts and Telecommunications 2011年第2期18卷 94-101页

作者： GAO Guang-yong jiang Guo-ping Center for Control & Intelligence Technology Nanjing University of Posts and Telecommunications Nanjing 210003 China School of Information Science & Technology Jiujiang University Jiujiang 332005 China

The problem to improve the performance of resisting geometric attacks in digital watermarking is addressed in this *** on the optimized support vector regression（SVR）,a zero-bit watermarking algorithm is *** proposed algorithm encrypts the watermarking image by using composite chaos with large key space and capacity against prediction,which can strengthen the safety of the proposed *** using the relationship between Tchebichef moment invariants of detected image and watermarking characteristics,the SVR training model optimized by composite chaos enhances the ability of resisting geometric *** analysis and simulations demonstrate that the proposed algorithm herein possesses better security and stronger robustness than some similar methods.

关键词： Tchebicbef moment invariants composite chaos SVR zero-bit watermarking