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Study of the Dynamic Characteristics of A Cone-Shaped Recovery System on Submarines for Recovering Autonomous Underwater Vehicle

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China Ocean Engineering 2020年第3期34卷 387-399页

作者： MENG Ling-shuai LIN Yang GU Hai-tao SU Tsung-Chow State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang 110016China Institutes for Robotics and Intelligent Manufacturing Chinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China Florida Atlantic University Boca RatonFL 33431USA

National navies equip their submarines with Autonomous Underwater Vehicle(AUV)*** has become an important component of submarine development in technologically-advanced *** advanced and reliable recovery systems directly improves the safety and operational efficiency of submarines equipped with *** this paper,based on aerial refueling technology,a cone-shaped recovery system with two different guiding covers(closed structure and frame structure)is applied to the *** taking the Suboff model as the research object,STAR-CCM was used to study the influence of the installation position of the recovery system,and the length of the rigid rod,on the Suboff *** was found that when the recovery system is installed in the middle and rear of the Suboff model at the same velocity and the same length of the rigid rod,the Suboff model has the good stability and less *** experiences the largest drag when being installed in the front of the rigid ***,when the recovery system is installed in the front and middle of the rigid rod,the drag increases as its length increases,and the lift decreases as its length *** with the closed structure guiding cover,the Suboff model will have less drag and better stability when the recovery system uses the frame structure guiding ***,the deflection and vibration of the rigid rod were also analyzed via mathematical theory.

关键词： cone-shaped recovery system submarine computational fluid dynamics(CFD) hydrodynamics deflection vibration

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Roasting decomposition of mixed rare earth tailings by CaO in reducing atmosphere

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Rare Metals 2017年第9期36卷 764-768页

作者： shuai Yuan He Yang Xiang-xin Xue Yan Zhou School of Materials and Metallurgy Northeastern University Institute of Metallurgy Resources and Environmental EngineeringShenyang 110004China

In Baotou rare earth tailings ore, the grade of rare earth is close to that of the raw ore nearly. The rare earths are discarded in tailings dam caused by a serious waste of resources. First of all, the decomposition products of bastnaesite-and monazite-mixed rare earth tailings in CaO in reducing atmosphere were studied by means of X-ray diffraction（XRD）. The results show that the normal products are CeO2, Ce2O3, Ca5F（PO4）3, and Ce（0.75）Nd（0.25）O（1.875）, and there are no REPO4 and ***, the roasted product was extracted in HCl, and the relationship among roasting time,roasting temperature,CaO addition, and extraction temperature was studied by the quadratic regression-orthogonal analysis. Through analysis, the optimum process conditions of mixed rare earth tailings extracted are obtained as follows： roasting time of 60 min, roasting temperature of 800℃, CaO addition of 30%, extraction temperature of 80℃, and extraction ratio of 99.18%.

关键词： Mixed rare earth tailings Reducing roasting Leaching ratio

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Application of Synchrotron X-Ray Imaging and Diffraction in Additive Manufacturing:A Review

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Acta Metallurgica Sinica(English Letters) 2022年第1期35卷 25-48页

作者： Naying An Sansan shuai tao Hu Chaoyue Chen Jiang Wang Zhongming Ren State Key Laboratory of Advanced Special Steels School of Materials Science and EngineeringShanghai UniversityShanghai200444China

Additive manufacturing(AM)is a rapid prototyping technology based on the idea of discrete accumulation which off ers an advantage of economically fabricating a component with complex geometries in a rapid design-to-manufacture ***,various internal defects,such as balling,cracks,residual stress and porosity,are inevitably occurred during AM due to the complexity of laser/electron beam-powder interaction,rapid melting and solidification process,and microstructure *** existence of porosity defects can potentially deteriorate the mechanical properties of selective laser melting(SLM)components,such as material stiff ness,hardness,tensile strength,and fatigue resistance *** X-ray imaging and diffraction are important non-destructive means to elaborately characterize the internal defect characteristics and mechanical properties of AM *** paper presents a review on the application of synchrotron X-ray in identifying and verifying the quality and requirement of AM ***,microstructures and mechanical properties of printed components characterized by synchrotron X-ray imaging and diffraction are summarized in this ***,this paper also elaborates on the online characterization of the evolution of the microstructure during AM using synchrotron X-ray imaging,and introduces the method for measuring AM stress by X-ray diffraction(XRD).Finally,the future application of synchrotron X-ray characterization in the AM is prospected.

关键词： Additive manufacturing Synchrotron X-ray imaging X-ray diffraction Defect formation Mechanical properties Residual stress

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Fabrication and sustained release properties of porous hollow silica nanoparticles

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Science China Chemistry 2010年第3期53卷 555-560页

作者： Xu, Hong tao Wang, xin Shou tao, Lei Ming Wu, Si xin Key Laboratory for Special Functional Materials of Ministry of Education Henan University Kaifeng 475004 China

MCM-41-type mesoporous silica nanospheres(MSN) have been prepared using n-cetyltrimethylammonium bromide(CTAB) as a soft *** pseudo-moire' rotational pattern inside the MSN results in many interior *** mesoporous silica(HMS) spheres were synthesized by solvent extraction of the template from *** morphology and structure of MSN and HMS were studied by TEM,XRD and nitrogen sorption techniques.A model drug,bromocresol green dye,was packed inside different regions of HMS through impregnation at different pressures and temperatures,and the drug release performance of the resulting materials was *** results showed that vacuum evaporation of solvents may enhance the controlled release properties.

关键词： pseudo-moire’ rotational pattern hollow silica release

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Identification of sources of pollution and contamination in water distribution networks based on pattern recognition

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第7期13卷 559-570页

作者： tao tao Ying-jun LU Xiang FU Kun-lun xin College of Environmental Science and Engineering Tongji University Shanghai 200092China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China

An intrusion of contaminants into the water distribution network (WDN) can occur through storage tanks (via animals, dust-carrying bacteria, and infiltration) and pipes. A sensor network could yield useful observations that help identify the location of the source, the strength, the time of occurrence, and the duration of contamination. This paper proposes a methodology for identifying the contamination sources in a water distribution system, which identifies the key characteristics of contamination, such as location, starting time, and injection rates at different time intervals. Based on simplified hypotheses and associated with a high computational efficiency, the methodology is designed to be a simple and easy-to-use tool for water companies to ensure rapid identification of the contamination sources, The proposed methodology identifies the characteristics of pollution sources by matching the dynamic patterns of the simulated and measured concentrations. The application of this methodology to a literature network and a real WDN are illustrated with the aid of an example. The results showed that if contaminants are transported from the sources to the sensors at intervals, then this method can identify the most possible ones from candidate pollution sources. However, if the contamination data is minimal, a greater number of redundant contamination source nodes will be present. Consequently, more data from different sensors obtained through network monitoring are required to effectively use this method for locating multi-sources of contamination in the WDN.

关键词： Contamination Identification Water distribution network (WDN)

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Isothermal reduction kinetics and mineral phase of chromium-bearing vanadium–titanium sinter reduced with CO gas at 873–1273 K

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International Journal of Minerals,Metallurgy and Materials 2018年第2期25卷 145-152页

作者： Song-tao Yang Mi Zhou tao Jiang Xiang-xin Xue School of Metallurgy Northeastern UniversityShenyang 110819China School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051China Key Laboratory of Liaoning Province for Recycling Science of Metallurgical Resources Shenyang 110819China

Reduction of chromium-bearing vanadium–titanium sinter（CVTS） was studied under simulated conditions of a blast furnace, and thermodynamics and kinetics were theoretically analyzed. Reduction kinetics of CVTS at different temperatures was evaluated using a shrinking unreacted core model. The microstructure, mineral phase, and variation of the sinter during reduction were observed by X-ray diffraction, scanning electron microscopy, and metallographic microscopy. Results indicate that porosity of CVTS increased with temperature. Meanwhile, the reduction degree of the sinter improved with the reduction rate. Reduction of the sinter was controlled by a chemical reaction at the initial stage and inner diffusion at the final stage. Activation energies measured 29.22–99.69 k J/mol. Phase transformations in CVTS reduction are as follows： Fe_2O_3→Fe_3O_4→FeO→Fe; Fe_2TiO_5→Fe_2TiO_4→FeTiO_3; FeO·V_2O_3→V_2O_3; FeO·Cr_2O_3→Cr_2O_3.

关键词： sinter kinetics reduction mineral phase

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Sintering behaviors and consolidation mechanism of high-chromium vanadium and titanium magnetite fines

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International Journal of Minerals,Metallurgy and Materials 2015年第9期22卷 917-925页

作者： Mi Zhou tao Jiang Song-tao Yang Xiang-xin Xue School of Materials and Metallurgy Northeastern University

To achieve high efficiency utilization of high-chromium vanadium-titanium magnetite （V-Ti-Cr） fines, an investigation of V Ti42r fines was conducted using a sinter pot. The chemical composition, particle parameters, and granulation of V-Ti-Cr mixtures were analyzed, and the effects of sintering parameters on the sintering behaviors were investigated. The results indicated that the optimum quicklime dosage, mixture moisture, wetting time, and granulation time for V-Ti-Cr fines are 5wt%, 7.5wt%, 10 min, and 5-8 min, respectively. Meanwhile, the vertical sintering speed, yield, tumbler strength, and productivity gains were shown to be 21.28 mm/min, 60.50wt% , 58.26wt%, and 1.36 t·m^-2·h^-1, respectively. Furthermore, the consolidation mechanism of V-Ti-Cr fines was clarified, revealing that the consolidation of a V-Ti-Cr sinter requires an approximately 14vo1% calcium ferrite liquid-state, an approximately 15vo1% silicate liq- uid-state, a solid-state reaction, and the recrystallization of magnetite. Compared to an ordinary sinter, calcium ferrite content in a V-Ti-Cr sinter is lower, while the perovskite content is higher, possibly resulting in unsatisfactory sinter outcomes.

关键词： magnetite chromium vanadium titanium ore sintering consolidation mineralogy

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On Basic Constraint Qualifications for Infinite System of Convex Inequalities in Banach Spaces

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Acta Mathematica Sinica,English Series 2007年第1期23卷 65-76页

作者： xin tao YE Chong LI Department of Mathematics Zhejiang University Hangzhou 310027 P. R. China Department of Mathematics Nanjing Xiaozhuang Institute Nanjing 210038 P. R. China Department of Mathematics Zhejiang University Hangzhou 310027 P R China

The BCQ and the Abadie CQ for infinite systems of convex inequalities in Banach spaces are characterized in terms of the upper semi-continuity of the convex cones generated by the subdifferentials of active convex functions. Some relationships with other constraint qualifications such as the CPLV and the Slate condition are also studied. Applications in best approximation theory are provided.

关键词： system of convex inequalities basic constraint qualification Abadie constraint qualification best approximation

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Hazard and vulnerability evaluation of water distribution system in cases of contamination intrusion accidents

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Frontiers of Environmental Science & Engineering 2012年第6期6卷 839-848页

作者： Kunlun xin tao tao Yong WANG Suiqing LIU College of Environmental Science and Engineering Tongji UniversityShanghai 200092China Zhejiang Urban&Rural Planning Design Institute Hangzhou 300072China

In this paper, it proposed an index system for hazard and vulnerability evaluations of water distribution networks, based on the simulation of contamination events caused by pollutant injections at different junctions. It attempted to answer the following two questions in the case of contamination events： 1） Which are the most hazardous junctions？ 2） Which are the most vulnerable junctions？ With EPANET toolkit, it simulated the propagation of the contaminant, and calculated the peak concentration of the contaminant and mass delivered at different nodes. According to types of consumers, different weights were assigned to the consumer nodes for assessing the influence of the contaminant on the consumers. Using the method proposed herein, both the hazard index and vulnerability index were calculated for each node in the pipe network. The presented method was therefore applied to the water network of the city of Zhenjiang, which contains two water plants, two booster pump stations with storage tanks. In conclusion, the response time, the relationships between the peak concentration of contami- nant and the total absorption are the most important factors in hazard and vulnerability evaluation of the water distribution network.

关键词： water distribution network hazard vulner-ability contaminant accident

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Polydimethylsiloxane assisted supercritical CO2 foaming behavior of high melt strength polypropylene grafted with styrene

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Frontiers of Chemical Science and Engineering 2016年第3期10卷 396-404页

作者： Weixia Wang shuai Zhou Zhong xin Yaoqi Shi Shicheng Zhao Shanghai Key Laboratory of Multiphase Materials Chemical Engineering East China University of Science and Technology Shanghai 200237 China State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China Shanghai Key Laboratory of Catalysis Technology for Polyolefin Shanghai Research Institute of Chemical Industry Shanghai 200062 China

Foamable high melt strength polypropylene （HMSPP） was prepared by grafting styrene （St） onto polypropylene （PP） and simultaneously introducing poly- dimethylsiloxane （PDMS） through a one-step melt extru- sion process. The effect of PDMS viscosity on the foaming behavior of HMSPP was systematically investigated using supercritical CO2 as the foaming agent. The results show that the addition of PDMS has little effect on the grafting reaction of St and HMSPP exhibits enhanced elastic response and obvious strain hardening effect. Though the CO2 solubility of HMSPP with PDMS （PDMS-HMSPP） is lower than that of HMSPP without PDMS, especially for PDMS with low viscosity, the PDMS-HMSPP foams exhibit narrow cell size distribution and high cell density. The fracture morphology of PDMS-HMSPP shows that PDMS with low viscosity disperses more easily and uniformly in HMSPP matrix, leading to form small domains during the extrusion process. These small domains act as bubble nucleation sites and thus may be responsible for the improved foaming performance of HMSPP.

关键词： high melt strength polypropylene (HMSPP),polydimethylsiloxane (PDMS) supercritical CO2 foaming behavior

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