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Preparation of spherical Y_2SiO_5 powders for thermal-spray coating

Particuology 2009年第5期7卷 368-372页

作者： Yangbao Qian Linzhong Du Weigang Zhang State Key Laboratory of Multi-phase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

Yttrium silicate, for its high oxidation resistance, is an important candidate for protective coating for carbon-fiber-reinforced composites at temperatures above 1600 ℃. A novel method, consisting of coprecipitation, spray-drying, heat-treatment and plasma-densification, is developed to prepare Y2SiO5 powders for thermal-spraying. The composition, morphology and flowability of the synthesized Y2SiO5 powders are investigated by XRD, SEM and Hall Flowmeter, respectively. The results show that the synthesized Y2SiO5 powders are nearly spherical with high purity. The apparent density and flowability of the Y2SiO5 powders are 1.87 g/cm^3 and 37 s/50 g, respectively, which lead to a high deposition efficiency of up to 80700 for atmospheric plasma spraying.

关键词： Yttrium silicate Thermal-spraying Oxidation protection coating

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Multi-scale HPC system for multi-scale discrete simulation—Development and application of a supercomputer with 1 Petaflops peak performance in single precision

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Particuology 2009年第4期7卷 332-335页

作者： Feiguo Chen Wei Ge Li Guo Xianfeng He Bo Li Jinghai Li Xipeng Li Xiaowei Wang Xiaolong Yuan State Key Laboratory o fMulti-Phase Complex System Institute of Process Engineering Chinese Academy of Sciences P.O. Box 353 Beijing 100190 China

A supercomputer with 1.0 Petaflops peak performance in single precision, designed and established by institute of Process engineering, Chinese Academy of Sciences, is introduced in this brief communication. A designing philosophy utilizing the similarity between hardware, software and the problems to be solved is embodied, based on the multi-scale method and discrete simulation approaches developed at institute of Process engineering （IPE） and implemented in a graphic processing unit （GPU）-based hybrid computing mode. The preliminary applications of this machine in areas of multi-phase flow, molecular dynamics and so on are reported, demonstrating the supercomputer as a paradigm of green computation in new architecture.

关键词： High-performance computing （HPC） Graphic processing unit （GPU） Lattice Boltzmann method Molecular dynamics Multi-phase flow Multi-scale method Particle method

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Development and Control of Underwater Gliding Robots:A Review

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IEEE/CAA Journal of Automatica Sinica 2022年第9期9卷 1543-1560页

作者： Jian Wang Zhengxing Wu Huijie Dong Min Tan Junzhi Yu the State Key Laboratory of Management and Control for Complex Systems Institute of AutomationChinese Academy of SciencesBeijing 100190 the School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100049China the State Key Laboratory for Turbulence and Complex System Department of Mechanics and Engineering ScienceBIC-ESATCollege of EngineeringPeking UniversityBeijing 100871China

As one of the most effective vehicles for ocean development and exploration,underwater gliding robots(UGRs)have the unique characteristics of low energy consumption and strong ***,by borrowing the motion principles of current underwater robots,a variety of novel UGRs have emerged with improving their maneuverability,concealment,and environmental friendliness,which significantly broadens the ocean *** this paper,we provide a comprehensive review of underwater gliding robots,including prototype design and their key *** the perspective of motion characteristics,we categorize the underwater gliding robots in terms of traditional underwater gliders(UGs),hybrid-driven UGs,bio-inspired UGs,thermal UGs,and ***,their buoyancy driven system,dynamic and energy model,and motion control are concluded with detailed ***,we have discussed the current critical issues and future *** review offers valuable insight into the development of next-generation underwater robots well-suited for various oceanic applications,and aims to gain more attention of researchers and engineers to this growing field.

关键词： Buoyancy driven motion control oceanic applications system development underwater gliding robots

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Identifying different community members in complex networks based on topology potential

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Frontiers of Computer Science 2011年第1期5卷 87-99页

作者： Yanni Han (1) hyn@*** Deyi Li (12) Teng Wang (1) State Key Laboratory of Software Development Environment Beijing University of Aeronautics and Astronautics Beijing 100191 China Institute of Electronic System Engineering Beijing 100039 China

There has been considerable interest in designing algorithms for detecting community structure in real-world complex networks. A majority of these algorithms assume that communities are disjoint, placing each vertex in only one cluster. However, in nature, it is a matter of common experience that communities often overlap and members often play multiple roles in a network topology. To further investigate these properties of overlapping communities and heterogeneity within the network topology, a new method is proposed to divide networks into separate communities by spreading outward from each local important element and extracting its neighbors within the same group in each spreading operation. When compared with the state of the art, our new algorithm can not only classify different types of nodes at a more fine-grained scale successfully but also detect community structure more effectively. We also evaluate our algorithm using the standard data sets. Our results show that it performed well not only in the efficiency of algorithm, but also with a higher accuracy of partition results.

关键词： complex network community structure,topology potential overlapping nodes

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China’s carbon neutrality:an extensive and profound systemic reform

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Frontiers of Environmental Science & engineering 2023年第2期17卷 1-7页

作者： Xi Lu Dan Tong Kebin He State Key Joint Laboratory of Environment Simulation and Pollution Control and School of Environment Tsinghua UniversityBeijing 100084China Institute for Carbon Neutrality Tsinghua UniversityBeijing 100084China Beijing Laboratory of Environmental Frontier Technologies Tsinghua UniversityBeijing 100084China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084China Department of Earth System Science Ministry of Education Key Laboratory for Earth System ModelingInstitute for Global Change StudiesTsinghua UniversityBeijing 100084China

China is the largest developing economy and carbon dioxide emitter in the world,the carbon neutrality goal of which will have a profound influence on the mitigation pathway of global climate *** transition towards a carbon-neutral society is integrated into the construction of ecological civilization in China,and brings profound implications for China’s socioeconomic ***,we not only summarize the major challenges in achieving carbon neutrality in China,but also identify the four potential new opportunities:namely,the acceleration of technology innovations,narrowing regional disparity by reshaping the value of resources,transforming the industrial structure,and co-benefits of pollution and carbon ***,we provide five policy suggestions and highlight the importance of balancing economic growth and carbon mitigation,and the joint efforts among the government,the enterprises,and the residents.

关键词： Carbon neutrality Energy structure Technology-dependent society Coordinated mitigation for air pollutants and CO_(2)

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system of systems complexity and decision making

System of systems complexity and decision making

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2012 7th International Conference on system of systems engineering, SoSE 2012

作者： Zhang, Yingchao Beijing Institute of System Engineering Science and Technology on Complex Systems Simulation Laboratory Beijing China

ISBN: (纸本)9781467329750

complexity in system of systems (SoS) is a key factor in SoS decision making. This paper analyzes the main characteristics of SoS, especially its complexity in terms of monolithic emergence, component systems adaption and uncertainty in SoS evolution. It further discusses the effects of SoS complexity on SoS decision making. In light of SoS complexity, the paper figures out the major problems that need to be addressed in four areas, namely SoS adaption, abnormity analysis in SoS evolution, exploratory analysis of SoS capability and SoS simulation. In conclusion the paper proposes a preliminary SoS decision making model based on the analysis of SoS adaption. © 2012 IEEE.

关键词： system of systems

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An analysis method for contribution degree of C4ISR system based on operational effectiveness

An analysis method for contribution degree of C4ISR system b...

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IASTED International Conference on Modelling and simulation, MS 2012

作者： Yu, Qin-Zhang Zhang, Ying-Chao Hu, Run-Tao Shen, Zhi-Ming Zhang, Jing Beijing Institute of System Engineering Science and Technology on Complex Systems Simulation Laboratory Beijing China

ISBN: (纸本)9780889869264

C4ISR system is the multiplicator of system of Armament systems (SoAS). An analysis method for Contribution Degree of C4ISR system is proposed in the paper. Firstly, Overall-Effect based evaluation method for operational effectiveness of SoAS is introduced. Secondly, Contribution Degree of C4ISR system is defined and experiment flow based on exploratory simulation is designed. On this basis, an analysis method for Contribution Degree of C4ISR system is put forward. Finally, a simulation experiment is executed to prove the effectiveness of the method.

关键词： C4ISR system Contribution Degree Analysis Method Operational Effectiveness Multiplying circuits simulation test evaluation method armament WWOX gene

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High-resolution ladar for multidimension detection: Design, modeling, and simulation

High-resolution ladar for multidimension detection: Design, ...

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International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging

作者： Wei, Yu-Fei Fei, Jin-Dong Mi, Qiang Gao, Yang Beijing Electronic System Engineering Institute Beijing 100854 China Key Laboratory of System Simulation Beijing Simulation Center Beijing 100854 China

ISBN: (纸本)9780819476630

As the development of application requirements, to obtain more information of the object is an important direction in many research fields. Not only 2-D image, but also range and velocity information are required. Hence, the imaging laser radar technology, which can obtain 3-D or even 4-D information, has been paid more attention. Because of the high range resolution character and direct Doppler frequency shift measurement function, frequency modulation / continuous wave (FM/CW) imaging laser radar can be called a 4-D imaging system. The modulated laser floodlights a moving object, and then the reflecting light is received by optical system and captured by a focal plane array. After obtaining a series of images, the range-Doppler processing algorithm is performed on the pixels with the same position in all the images to calculate the object's range and velocity information, and then a 4-D image (angle - angle - range - velocity) with high accuracy is obtained. This paper describes the FM/CW ladar system's principle, and presents an improved process algorithm to solve the problem of the traditional range-Doppler algorithm's limit used for high velocity object. The simulation results in typical object situation prove that the improved process algorithm could increase the velocity measurement range effectively. © 2009 SPIE.

关键词： Optical radar

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Effect of SiO_(2)/Al_(2)O_(3)ratio on the conversion of methanol to olefins over molecular sieve catalysts

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Frontiers of Chemical Science and engineering 2011年第1期5卷 79-88页

作者： Qian WANG Lei WANG Hui WANG Zengxi LI Xiangping ZHANG Suojiang ZHANG Kebin ZHOU Graduate University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Multiphase Complex System Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

A series of SAPO-34 molecular sieves with different SiO_(2)/Al_(2)O_(3)ratios have been synthesized for the methanol-to-olefin(MTO)*** physico-chemical properties are characterized by various techniques such as X-ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),Fourier transform infrared spectroscopy(FT-IR)and N2 *** results are compared with those of the commercial HZSM-5,which show that the crystallinity and particle diameter of SAPO-34 as well as HZSM-5 increase with SiO_(2)/Al_(2)O_(3)*** variation of BET surface area of SAPO-34 is different from that of HZSM-5 and the sample with SiO_(2)/Al_(2)O_(3)ratio of 0.4 exhibits the highest BET surface ***-IR spectra indicate that HZSM-5 has both Brǿnsted and Lewis acid sites and Brǿnsted acid sites are stronger,whereas SAPO-34 samples are dominated only by Lewis acid *** the SiO_(2)/Al_(2)O_(3)ratio increases,propylene and butylenes become the predominant product of the MTO reaction over *** contrast,the main products of this reaction catalyzed by SAPO-34 are ethylene and *** to the product distribution,the reaction mechanism over HZSM-5 catalysts is proposed.

关键词： HZSM-5 SAPO-34 methanol-to-olefin(MTO) SiO_(2)/Al_(2)O_(3)ratio

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A Macro-Mechanical Study for Capturing the Dynamic Behaviors of a Rate-Dependent Elastomer and Clarifying the Energy Dissipation Mechanisms at Various St rain Rates

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Acta Mechanica Solida Sinica 2022年第2期35卷 228-238页

作者： Shahzad Fateh Ali Jitang Fan Jianqing Feng Xiangquan Wei State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Aerospace System Engineering shanghai Shanghai 201109China

A strain-rate-sensitive polyurethane elastomer is numerically investigated to reveal improved impact characteristics and analyze the concerned rate dependencies and dynamic energy dissipation features.A physical constitutive model in view of amorphous molecular struc-ture of the elastomer is proposed by relating the macro-mechanical behaviors to micro-structural changes through molecular transitions and flow *** distinct relaxation processes are considered because of entangled molecular net works,with each possessing a unique activation *** calibration with experimental data,finite element simulations based on the model are *** to the loading rate,the structural entropy of molecular chain entanglements,rate-dependent yielding,plateau flow and densification are well predicted by the *** investigations are extended further regarding the material recoverability and accordingly,strain energy absorptions are illustrated.A power law function is proposed for designing the energy absorption relation to the applied loading ***,the inherent mechanisms causing the dynamic energy absorptions are analyzed with notable clarifications of post-experimental observations obtained via scanning elec Iron microscopy.

关键词： Elastomer Constitutive model Energy absorption Ratedependent Scanning electron microscopy

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