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Self-sustained Oscillation Pulsed Air Blowing System for Energy Saving

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Chinese Journal of Mechanical Engineering 2010年第3期23卷 317-326页

作者： CAI Maolin XU weiqing School of Automatic Science and Electrical Engineering Beihang University Beijing 100191 China

Currently, many studies have been made for years on dimensions of pneumatic nozzle, which influence the flow characteristic of blowing system. For the purpose of outputting the same blowing force, the supply pressure could be reduced by decreasing the ratio of length to diameter of nozzle. The friction between high speed air and pipe wall would be reduced if the nozzle is designed to be converging shape comparing with straight shape. But the volume flow and pressure, discussed in these studies, do not describe energy loss of the blowing system directly. Pneumatic power is an innovative principle to estimate pneumatic system’s energy consumption directly. Based on the above principle, a pulse blowing method is put forward for saving energy. A flow experiment is carried out, in which the high speed air flows from the pulse blowing system and continuous blowing system respectively to a plate with grease on top. Supply pressure and the volume of air used for removing the grease are measured to calculate energy consumption. From the experiment result, the pulse blowing system performs to conserve energy comparing with the continuous blowing system. The frequency and duty ratio of pulse flow influence the blowing characteristic. The pulse blowing system performs to be the most efficient at the specified frequency and duty ratio. Then a pneumatic self-oscillated method based on air operated valve is put forward to generate pulse flow. A simulation is made about dynamic modeling the air operated valve and calculating the motion of the valve core and output pressure. The simulation result verifies the system to be able to generate pulse flow, and predicts the key parameters of the frequency and duty ratio measured by experiment well. Finally, on the basis of simplifying and solution of the pulse blowing system’s mathematic model, the relationship between system’s frequency duty ratio and the dimensions of components is simply described with four algebraic equations. The syst

关键词： energy saving pulse blowing self-sustained oscillation pneumatic power

Polymer-based hybrid materials and their application in personal health

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Nano Research 2023年第3期16卷 3956-3975页

作者： Ran Cao Yanhua Cheng Ruili Wang jin Wen Liping Zhu weiqing Kong Xiaolan Qiao Meifang Zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

With unprecedented properties and functions,polymer-based hybrid materials hold extremely important position in many *** in this review,we summarized applications of polymer-based hybrid materials toward personal ***,theoretical calculation and in-situ visualization used to explore the interfacial interaction and formation of hybrid materials are ***,applications of polymer-based hybrid materials in personal health from proactive protection(anti-bacteria and harmful gas removal),health condition monitoring(breathing and sleep)to disease diagnosis(magnetic resonance imaging),and tissue therapy(dental restoration)are ***,aggregation-induced emission(AIE)organic molecules based optical sensors for personal security and polymer semiconductor for organic thin film transistors are simply ***,we present the future tendency for preparing polymer-based hybrid materials that related with personal health.

关键词： hybrid materials protection monitoring biomedical function

Task allocation based on profit maximization for mobile crowdsourcing

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The Journal of China Universities of Posts and Telecommunications 2020年第1期27卷 26-37页

作者： Hou Yinglin Cheng weiqing School of Computer Science Nanjing University of Posts and TelecommunicationsNanjing 210023China Key Laboratory of Computer Network and Information Integration Southeast UniversityNanjing 211189China

In recent years, with the development of smart devices, mobile users can use them to sense the environment. In order to improve the data quality and achieve maximum profits, incentive mechanism is needed to motivate users to participate. In this paper, reputation mechanism, participant selection, task allocation and joint pricing in mobile crowdsourcing system are studied. A user reputation evaluation method is proposed, and a participant selection algorithm(PSA) based on user reputation is proposed. Besides, a social welfare maximization algorithm(SWMA) is proposed, which achieves task pricing with maximizing the interests of all parties, including both task publishers and mobile users. The social welfare maximization problem is divided into local optimization sub-problems which can be solved by double decomposition. It is proved that the algorithm converges to the optimal solution. Results of simulations verify that algorithms PSA and SWMA are effective.

关键词： mobile crowdsourcing maximum profits reputation mechanism task allocation

提拉法生长铌酸锂单晶的固液界面显微形貌观察

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人工晶体 1985年第Z1期 205-205页

作者：金蔚青周伟庆金吉人中国科学院上海硅酸盐研究所中国科学院上海硅酸盐研究所

本实验通过对轴向生长 LiNbO3单晶的小面区固液界面的显微形貌观察（olympu透光微分干涉显微镜）,追溯了固液界面形貌的动态变化,由{01·2}晶面组成的固液界面逐渐向等温曲面组成的弯曲固液界面演变。它包含了下面一些现象:1.在低过冷... 详细信息

本实验通过对轴向生长 LiNbO3单晶的小面区固液界面的显微形貌观察（olympu透光微分干涉显微镜）,追溯了固液界面形貌的动态变化,由{01·2}晶面组成的固液界面逐渐向等温曲面组成的弯曲固液界面演变。它包含了下面一些现象:1.在低过冷度的生长条件下,固液界面具有由{Ol·2}晶面组成的了 LK（Terrace-Ledgekjnr）模式的特性;随着过冷度的增加 TLK 模式中的台阶（Ledge）和扭折（Kink）的形貌发生

关键词：固液界面铌酸锂单晶提拉法生长过冷度微分干涉显微镜显微形貌扭折凹角组分过冷棱线

Formation of CaO-TiO_2-MgO-Al_2O_3 dual phase inclusion in Ti stabilized stainless steel

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Journal of University of Science and Technology Beijing 2006年第1期13卷 16-20页

作者： Hongguang Zheng weiqing Chen Metallurgical and Ecological Engineering School University of Science and Technology Beijing Beijing 100083 China

The formation of CaO-TiO2-MgO-Al2O3 dual phase inclusion in 321 stainless steel was investigated in the laboratory. The result indicated that the condition for the formation of CaO-TiO2-MgO-Al2O3 in 321 steel is [Ca]〉0.001wt%, [Ti]〉0.1wt%, and [A1]〉0.01wt%. The mechanism is the following： Al2O3 inclusion turns into CaO-Al2O3 after Ca-Si wire is fed into the molten steel; [Mg] is then obtained by reducing MgO in slag or crucible wall by [Al] and [Ti]; finally CaO-Al2O3 inclusion is changed into CaO-TiO2-MgO-Al2O3 by the reaction with [Mg], [Ti], and [O] in the molten steel simultaneously.

关键词： stainless steel titanium inclusion formation condition mechanism

Strategic Investment in Transmission and Energy Storage in Electricity Markets

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Journal of Modern Power Systems and Clean Energy 2022年第1期10卷 179-191页

作者： Kunpeng Tian weiqing Sun Dong Han Department of Control Science and Engineering University of Shanghai for Science and TechnologyShanghaiChina Department of Electrical Engineering University of Shanghai for Science and TechnologyShanghaiChina

The variability of renewable energy and transmission congestion provide opportunities for arbitrage by merchants in deregulated electricity *** strategically invest to maximize their *** paper proposes a joint investment framework for renewable energy,transmission lines,and energy storage using the Stackelberg game *** the upper level,merchants implement investment and operation strategies for deregulated transmission and energy storage to maximize *** the middle level,central planners seek to maximize social welfare through investments in centralized renewable energy and energy *** the lower level,independent system operators jointly optimize the energy and reserve markets to minimize the total operating *** are remunerated through financial rights,which are a settlement method based on locational marginal *** trilevel optimization problem is reformulated as a tractable single-level one using Karush-Kuhn-Tucker(KKT)conditions and strong duality *** interaction between merchants and central planners is studied with an example based on the IEEE 30-bus test *** assignment of weight coefficients to the corresponding stochastic scenarios can help merchants avoid investment risk,and their effectiveness is verified with the IEEE 118-bus test system.

关键词： Strategic investment Stackelberg game model financial right locational marginal price merchant central planner

The Study of Mechanisms and Morphologies of Anisotropic Salol Crystal Growth in Melt

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人工晶体 1988年第Z1期 161-161页

作者：林晶金蔚青何崇藩 Shanghai Institute of Ceramics Academia Sinica China

In situ observation method is used to study the crystal growth mechanismsand morphologies of salol(phenyl salicylate,C13H10O3) in *** situ obser-vation system contains an Olympus polarizing *** a conven-tional TV came... 详细信息

关键词： In rate The Study of Mechanisms and Morphologies of Anisotropic Salol Crystal Growth in Melt

New insight into the effect of interface supercapacitance on the performance of titanium dioxide/carbon nanowire array for photoelectrochemical water oxidation

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Chinese Chemical Letters 2021年第11期32卷 3359-3363页

作者： Zhuofeng Hu weiqing Guo School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation TechnologySun Yat-sen UniversityGuangzhou 510006China School of Environmental and Chemical Engineering Foshan UniversityFoshan 528000China

The electrode/electrlyte interface is of great signifance to photoelectrochemical(PEC)water oxidation as the reaction mainly occur ***,we focus on the effect of supercapactance of the electrode/electrlyte interface on the performance of *** is discovered that the supercapacitor on the interface is crucial because it links the charge transport and solution ion adsorption on its two *** this study,we demonstrate an approach to promote the performance of TiO_(2)nanowire array(TiO_(2)NWs)photoanode in photoelectrochemical cells(PECs)by increasing its supercapacitance.A 2−5 nm carbon layer was coated and the interface supercapacitance increases by about 150 *** enhances the separation rate of electron-hole pairs by collecting more ***,it also promotes the water oxidation rate by adsorbing more OH−on its *** a result,the photocurrent density of C-TiO_(2)NWs was about 8 times higher than that of its carbon-free *** approach of increasing the supercapacitance of photoanodes would be attractive for enhancement of the efficiency of PECs and this work demonstrate the importance of supercapacitance of the interface for PECs.

关键词： TiO_(2) Carbon Supercapacitor Photoelectrochemical Water oxidation

Effect of Boron Content on the Microstructure and Magnetic Properties of Non-oriented Electrical Steels

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Journal of Wuhan University of Technology(Materials Science) 2015年第3期30卷 574-579页

作者：万勇 CHEN weiqing State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Metallurgical Engineering Anhui University of Technology

The effects of boron content in the range of 0-0.0082 wt%, on the inclusion type, microstructurc, texture and magnetic properties of non-oriented electrical steels have been studied. After final annealing, the addition of excess boron（w（B0〉0.004 1 wt%） led to the formation of Fe2B particles. As boron content increased, grain size increased and reached a maximum in steel with 0.004 1 wt% boron. Furthermore, steel containing 0.004 1 wt% boron had the strongest { 100} fiber texture, Goss texture and the weakest { 111 } fiber texture among the five tested steels. Flux density firstly rapidly increased and then suddenly decreased with increasing boron content and reached a maximum in steel with 0.004 1 wt% boron. Conversely, core loss first sharply decreased and then abruptly increased with the increase of boron content and reached a minimum in steel containing 0.004 1 wt% boron. Steel containing 0.004 1 wt% boron obtained the best magnetic properties, predominantly through the development of optimum grain size and favorable texture.

关键词： boron non-oriented electrical steel grain size texture magnetic property