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天津城市建设学院学报 2002年第3期8卷 190-193页

作者：王少杰涂光备郑宗和费良斌天津大学环境科学与工程学院天津300072 天津大学太阳能研究所天津300072

通过对影响水箱容积与集热面积合理配比取值若干问题的分析 ,提出了应根据设备投资、热水器服务地区的气象条件等因素 ,来考虑太阳能热水器水箱容积与集热面积合理配比取值的观点 ,给出了以最大收益为目标函数的计算公式。

关键词：水箱容积集热面积太阳能热水器容积面积比非稳态效率

WSGM-SD: An Approach to RESTful Service Discovery Based on Weighted Service Goal Model

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Chinese Journal of Electronics 2016年第2期25卷 256-263页

作者： ZHANG Neng he Keqing WANG Jian LI zheng State Key Laboratory of Software Engineering School of ComputerWuhan University School of Computer and Information Engineering Henan University

Faced with the rapidly increasing Web services, it becomes a challenging issue for users to effectively and accurately discover and reuse services. Existing service discovery approaches are mainly developed for services with WSDL documents, while only a few attention is being paid to services described in natural language,especially to the RESTful services. Towards this issue, we introduce a Weighted service goal model(WSGM) by measuring the weights of service goals extracted from the textual descriptions of services. Based on the WSGM, a novel service discovery approach called Service discovery based on WSGM(WSGM-SD) is proposed. Experiments on Programmable Web, a public Web service repository, demonstrate the effectiveness of the proposed approach.

关键词： RESTful service discovery Weighted service goal model Text mining

EFFECTS OF COUPLING AGENTS ON The CRYSTALLIZATION BEHAVIOR OF PP/T-ZnOw COMPOSITES

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Chinese Journal of Polymer Science 2007年第6期25卷 565-572页

作者： Yong Wang zheng-bao he Zuo-wan Zhou Key Laboratory of Advanced Technologies of Materials Ministry of Education School of Materials Science and Engineering Southwest Jiaotong University Chengdu 610031 China State Key Laboratory of Polymer Materials Engineering （Sichuan University） Chengdu 610065 China

The objectives of this paper are to understand the crystallization behavior of polypropylene （PP） composites with surface modified tetra-needle-shaped zinc oxide whisker （T-ZnOw）. T-ZnOw was surface modified with different coupling agents, such as silane coupling agents （KH-550, KH-560） and titanate coupling agent （NDZ-105）, in order to improve the compatibility between PP and T-ZnOw. DSC and POM were used to characterize the melt and crystallization behavior and the crystalline structures of the composites, respectively. The results show that the surface modified T-ZnOw acts as a nucleating agent of PP crystallization, depending on the coupling agent used for modification. KH-550 and KH-560 have more apparent role in improving the interfacial interaction than NDZ-105 and induce PP crystallization at higher temperature and with smaller spherulites size. The results also suggest that the crystallization behavior depends on not only the content of coupling agent, but also the content of the surface modified T-ZnOw used in the composites.

关键词： PP/T-ZnOw Crystallization behaviour Coupling agent.

Aerosol effects on ozone concentrations in Beijing:A model sensitivity study

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Journal of Environmental Sciences 2012年第4期24卷 645-656页

作者： Jun Xu Yuanhang Zhang Shaoqing zheng Youjiang he State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing 100012 China College of Environmental Sciences Peking University Beijing 100871 China Appraisal Center for Environment ＆ Engineering State Environmental Protection Administration Beijing 100012 China

Most previous O3 simulations were based only on gaseous phase photochemistry. However, some aerosol-related processes, namely, heterogeneous reactions occurring on the aerosol surface and photolysis rate alternated by aerosol radiative influence, may affect O3 photochemistry under high aerosol loads. A three-dimensional air quality model, Models-3/Community Multi-scale Air Quality-Model of Aerosol Dynamics, Reaction, Ionization, and Dissolution, was employed to simulate the effects of the above-mentioned processes on O3 formation under typical high O3 episodes in Beijing during summer. Five heterogeneous reactions, i.e., NO2, NO3, N2O5, HO2, and O3, were individually investigated to elucidate their effects on O3 formation. The results showed that the heterogeneous reactions significantly affected O3 formation in the urban plume. NO2 heterogeneous reaction increased O3 to 90 ppb, while HO2 heterogeneous reaction decreased O3 to 33 ppb. In addition, O3 heterogeneous loss decreased O3 to 31 ppb. The effects of NO2, NO3, and N2O5 heterogeneous reactions showed opposite O3 concentration changes between the urban and extra-urban areas because of the response of the reactions to the two types of O3 formation regimes. When the aerosol radiative influence was included, the photolysis rate decreased and O3 decreased significantly to 73 ppbO3. The two aerosol-related processes should be considered in the study of O3 formation because high aerosol concentration is a ubiquitous phenomenon that affects the urbanand regional air quality in China.

关键词： aerosol heterogeneous reactions ozone radiative influence

Unification of identifiers in the Sea-Cloud system

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Frontiers of Computer Science 2018年第4期12卷 749-762页

作者： zheng he Kunpeng BAI Dongdai LIN Chuankun WU State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Beijing 100093 China School of Cyber Security University of Chinese Academy of Sciences Beijing 100049 China

The Sea-Cloud Innovative and Experimental Environment is designed for the Strategic Priority Research Program of the ＂Next Generation of Information Technology for Sensing China＂. It was founded by the Chinese Academy of Sciences. There will be billions of heterogeneous devices in the ＂Sea＂ domain. Without unified identifier standards for these devices, issues such as confusion of identifier standards and duplicate identifiers might arise when using these devices in the Sea-Cloud Environment. This paper proposes a unified identifier scheme for the Sea-Cloud system based on different existing identifier standards for different types of devices in the Sea domain. Furthermore, this paper defines a unique identifier for every person who uses smart devices in the Sea domain. Keywords the Sea-Cloud system, identifier standard, Internet of Things

关键词： the Sea-Cloud system identifier standard Internet of Things

Operating condition influences on PCDD/Fs emissions from sinter pot tests with hot flue gas recycling

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Journal of Environmental Sciences 2012年第5期24卷 875-881页

作者： Yongmei Yu Minghui zheng Xianwei Li Xiaolei he State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences P.O. Box 2871 Beijing 100085 China Research Institute of Baoshan Iron & Steel Co. Ltd. Shanghai 201900 China

This study was designed to clarify the influence of operating conditions on the formation and emissions of polychlorinated-p-dibenzodioxins and dibenzofurans （PCDD/Fs） from a sintering process with hot flue gas recycling. A pilot scale sinter pot with simulated flue gas recycling was developed, and four key operational parameters, including temperature, oxygen content of the simulated waste flue gas, the coke rate of the sintering mixture, and the quicklime quality, were selected for exploring PCDD/Fs formation. The results showed that the temperature of the recycled flue gas had a major affect on PCDD/Fs formation, and a high temperature could significantly increase their formation during sintering. A clear linear correlation between the temperature of recycling flue gas and PCDD/Fs emission （r = 0.93） was found. PCDD/Fs could be reduced to a certain extent by decreasing the level of oxygen in the recycled flue gas, while sintering quality was unchanged. The coke rate had no significant influence on the formation of PCDD/Fs, but the quality of quicklime used in the sintering mixture could affect not only the amount of PCDD/Fs emissions but also the sintering productivity. Compared with a benchmark sinter pot test, PCDD/Fs emissions markedly decreased with improvements to quicklime quality. However, the reduction in PCDD/Fs emissions realized by using high-quality quicklime was limited by the temperature of the inlet gas. The highest reduction achieved was 51% compared with conventional quicklime when the temperature of the inlet gas was 150°C.

关键词： PCDD/Fs sintering recycling flue gas formation mechanism

Integrated guidance and control design of a flight vehicle with side-window detection

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Chinese Journal of Aeronautics 2018年第4期31卷 749-764页

作者： Tianyu zheng Yu YAO Fenghua he Denggao JI Department of Astronautics Harbin Institute of Technology Harbin 150080 China Beijing Institute of Nearspace Vehicle's Systems Engineering Beijing 100083 China

This paper considers the guidance and control problem of a flight vehicle with sidewindow detection. In order to guarantee the target remaining in the seeker＇s sight of view, the line of sight and the attitude of the flight vehicle should be under some constraints caused by the sidewindow, which leads to coupling between the guidance and the attitude dynamics model. To deal with the side-window constraints and the coupling, a novel Integrated Guidance and Control（IGC）design approach is proposed. Firstly, the relative motion equations are derived in the body-Line of Sight（LOS） coordinate system. And the guidance and control problem of the flight vehicle is formulated into an IGC problem with state constraints. Then, based on the singular perturbation method, the IGC problem is decomposed into the control design of the quasi-steady-state subsystem and the boundary-layer subsystem which can be designed separately. Finally, the receding horizon control is applied to the control design for the two subsystems. Simulation results show the effectiveness of the proposed approach.

关键词： Integrated guidance and control Receding horizon control Side-window detection Singular perturbation Terminal guidance

Multicomponent polymerization of sulfur, chloroform and diamine toward polythiourea

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Science China Chemistry 2023年第3期66卷 870-877页

作者： Nan zheng he Gao Zihui Jiang Wangze Song Department of Polymer Science and Engineering School of Chemical EngineeringDalian University of TechnologyDalian 116024China

The efficient utilization of elemental sulfur(S8) for developing high value-added chemicals is a global concern considering its abundant sources and yearly accelerating environmental issues. However, it has been a long-standing challenge to directly transform elemental sulfur to sulfur-containing polymer, especially via an environmentally benign manner. herein, a unique chemo-differentiating multicomponent polymerization(MCP) of elemental sulfur, chloroform, and diamine is reported to construct polythiourea based on amine-involved two sequential reactions including isothiocyanation and nucleophilic *** strategy features isocynide-free monomers as starting materials, mild conditions, high molecular weights(up to72,900 g/mol) and desired yields(up to 83%). With the advantages of inactive isocyanation and active nucleophilic addition, the stoichiometric balance of amine and isothiocyanate could be delicately controlled to afford various polythioureas with high molecular weights. The polythioureas have been further utilized in the Cu-based aqueous catalysis and Hg-based ion adsorption.

关键词： multicomponent polymerization elemental sulfur polythiourea environmental friendliness

Multi-input multi-output random vibration control using Tikhonov filter

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Chinese Journal of Aeronautics 2016年第6期29卷 1649-1663页

作者： Cui Song Chen Huaihai he Xudong zheng Wei State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics

Noises always disturb the control effect of an environment test especially in multi-input multi-output(MIMO) systems. If the frequency response function matrices are ill-conditioned, the noises in the driving forces will be amplified and the response spectral lines may awfully exceed their tolerances. Most of the major biases between the response spectra and the reference spectra are produced by the amplified noises. However, ordinary control algorithms can hardly reduce the level of noises. The influences of the noises on both the auto- and cross-power spectra are analyzed in this paper. As a conventional frequency domain method on the inverse problem, the Tikhonov filter is adopted in the environment test to suppress the exceeding spectral lines. By altering regularization parameters gradually, the auto-power spectra can be improved in a closed control loop. Instead of using the traditional way of selecting regularization parameters, we observe the coherence change to estimate noise eliminations. Incidentally, the requirement of coherence control can be realized. The errors of the phase are then studied and a phase control algorithm is introduced at the end as a supplement of cross-power spectra control. The Tikhonov filter and the proposed phase control algorithm are tested numerically and experimentally. The results show that the noises in the vicinity of lightly damped resonant peaks are more stubborn. The response spectra are able to be greatly improved by the combination of these two methods.

关键词： Coherence Environmental testing Multi-input multi-output(MIMO) Noise Phase control Tikhonov filter

Facile 3D cell culture protocol based on photocurable hydrogels

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Bio-Design and Manufacturing 2021年第1期4卷 149-153页

作者： Mingjun Xie Yating zheng Qing Gao Yong he State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Engineering for Life Group(EFL) Suzhou 215101China

Introduction Why 3D cell culture urgently needed?Tissue engineering has extremely influenced the development process of basic biological studies and biomedical *** quite a long time,the vast majority of these researches have been relying on the experimental results of conventional two-dimensional(2D)cell culture in flask,petri dish or well ***,these 2D culture results could be very different with or even totally opposite to the actual situations in vivo where cells grow inside a 3D extracellular matrix(ECM).Therefore,3D cell culture has been playing a more and more significant role because of its higher accuracy and authenticity[1–4].

关键词： has culture quite