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Fast prediction for multi-parameters(concentration,temperature and humidity)of indoor environment towards the online control of HVAC system

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Building Simulation 2021年第3期14卷 649-665页

作者： Hao-Cheng zhu Chen Ren Shi-jie Cao School of Architecture Southeast University2 SipailouNanjing27009China Global Centre for Clean Air Research(GCARE) Department of Civil and Environmental EngineeringFaculty of Engineering and Physical SciencesUniversity of SurreyGuildfordSurreyUK Academy of Building Energy Efficiency School of Civil EngineeringGuangzhou UniversityGuangzhou 570006China

Heating,ventilation and air conditioning(HVAC)systems are the most energy-consuming building implements for the improvement of indoor environmental quality(IEQ).We have developed the optimal control strategies for HVAC system to respectively achieve the optimal selections of ventilation rate and supplied air temperature with consideration of energy conservation,through the fast prediction methods by using low-dimensional linear ventilation model(LLVM)based artificial neural network(ANN)and low-dimensional linear temperature model(LLTM)based contribution ratio of indoor climate(CRI_((T))).To be continued for integrated control of multi-parameters,we further developed the fast prediction model for indoor humidity by using low-dimensional linear humidity model(LLHM)and contribution ratio of indoor humidity(CRI_((H))),and thermal sensation index(TS)for *** was used to construct the prediction database for CO_(2),temperature and ***-dimensional linear models(LLM),including LLVM,LLTM and LLHM,were adopted to expand database for the sake of data storage ***,coupling with ANN,CRI_((T)) and CRI_((H)), the distributions of indoor CO_(2) concentration,temperature,and humidity were rapidly predicted on the basis of LLVM-based ANN,LLTM-based CRIm and LLHM-based CRM ***,according to the self-defined indices(i.e.,E_(V),E_(T),E_(H)),the optimal balancing between IEQ(indicated by CO_(2) concentration,PMV and TS)and energy consumption(indicated by ventilation rate,supplied air temperature and humidity)were synthetically *** total HVAC energy consumption could be reduced by 35%on the strength of current control *** work can further contribute to development of the intelligent online control for HVAC systems.

关键词： HVAC system indoor air pollution thermal comfort indoor humidity control

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Crystallization and heat transfer of CaO-SiO2-based slag for high-Mn-high-Al steel

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Journal of Iron and Steel Research International 2020年第7期27卷 788-795页

作者： jie Yang Deng-fu Chen Miao-yong zhu College of Material Science and Engineering Chongqing UniversityChongqing400044China School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

The crystallization and heat transfer of CaO-SiO2-based slag for high-Mn-high-Al steel have been investigated by coupling composition evolution with heat transfer and non-isothermal *** was found that the concentrations of Al2O3 and MnO in the slag were determined by the relative contents of Al and Mn in molten *** temperature of the slag rose with the increase in Al2O3 content first and then fell due to the coupled effects of basicity and Al2O3,and a small amount of MnO cannot change this *** viscosity of slags led to less obvious characterizations of *** crystalline phase analysis suggested that MnO accumulation suppressed the formation of fluorite *** the Al2O3 content increased,the precipitation of cuspidine was replaced by the blocky gehlenite crystals,while the number and the size of nepheline and fluorite crystals both *** to the thickness and the crystallization structure of slags,the heat flux in the slag film first decreased and then increased with higher Al2O3 ***,a new type of CaO-SiO2-based mold slag with high basicity was applied in plant trial,and the change in composition and properties of mold slag was studied.

关键词： High-Mn-high-Al steel Mold slag Al2O3 accumulation Crystallization Heat transfer

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A data-driven approach for modeling and predicting the thrust force of a tunnel boring machine

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第9期24卷 801-816页

作者： Lintao WANG Fengzhang zhu jie LI Wei SUN School of Mechanical Engineering Dalian University of TechnologyDalian 116024China North Automatic Control Technology Institute Taiyuan 030006China

Thrust prediction of a tunnel boring machine(TBM)is crucial for the life span of disc cutters,cost forecasting,and its design *** factors affect the thrust of a *** rock pressure on the shield,advance speed,and cutter water pressure will all have a certain *** addition,geological conditions and other random factors will also influence the thrust and greatly increase the difficulty of modeling it,seriously affecting the efficiency of tunnel *** overcome these challenges,this paper establishes a thrust prediction model for the TBM based on the combination of on-site quality record data and surrogate model ***,the thrust composition and influencing factors are analyzed and the thrust is modeled using a surrogate model based on field *** main factor screening based on the Morris method,the accuracy of the surrogate model is greatly *** Kriging model with the highest accuracy is selected to model the thrust and predict the thrust of the unexcavated *** results show that the thrust model has better thrust prediction by selecting similar conditions for modeling and reasonably increasing modeling *** thrust prediction method of TBM based on the combination of field data and surrogate model can accurately predict the dynamic thrust of the load and can also accurately estimate its statistical characteristics and effectively improve the excavation plan.

关键词： Tunnel boring machine(TBM) Thrust prediction Surrogate model Morris method

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Mechanism of CeO_(2) synthesized by thermal decomposition of Ce-MOF and its performance of benzene catalytic combustion

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Journal of Rare Earths 2021年第7期39卷 790-796,I0002页

作者： jie Zheng zhuo Wang zhu Chen Shufeng Zuo Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process Shaoxing UniversityShaoxing 312000China

In this paper,the formation mechanism of mesoporous CeO_(2) synthesized by thermal decomposition of Ce-MOF and its performance of benzene catalytic combustion,as well as the structure-activity relationship between them were studied in *** self-assembly process and physicochemical properties of CeO_(2) were characterized by thermogravimetry analysis,powder X-ray diffraction,N2 adsorption/desorption,high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy *** results show that Ce-MOF is completely decomposed into pure mesoporous CeO_(2) when the decomposition temperature is higher than 400℃.At this threshold temperature,CeO_(2)(400) has the largest specific surface area and pore volume of 114 m^(2)/g and 0.152 cm^(3)/g,***_(2)(400) exhibits very high catalytic activity for benzene combustion,which can completely catalyze the degradation of benzene at 260℃.Meanwhile,the mesoporous CeO_(2)(400) supported Pt nanocrystalline catalysts were prepared by high temperature solution-phase reduction ***/CeO_(2)(400)can completely degrade benzene at about 200℃ and represents high durability and good waterresistance for benzene combustion during 100 h of continuous reaction.

关键词： Thermal decomposition Ce-MOF Mechanism Structure-effect relationship Benzene Catalytic combustion

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High-purity, low-Cl V2O5 via the gaseous hydrolysis of VOCl3 in a fluidized bed

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Particuology 2020年第2期18卷 9-15页

作者： Chuanlin Fan jie Xu Haitao Yang Qingshan zhu State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Multiphase Complex Systems.Institute of Process Engineering Chinese Academy of SciencesBeijing 100190China

Present-day all-vanadium redox flow batteries(VRFBs)generally require high purity vanadium oxide as a raw *** chlorination procedure presents distinct technical advantages with regard to preparing high purity vanadium pentoxide(V2O5)using vanadium oxytrichloride(VOCl3)as a highly pure *** efficiently prepare high purity V2Os from VOCl3,a single-step fluidized bed chemical vapor deposition(FBCVD)method was explored in the present *** on thermodynamic analyses,the direct and complete conversion of VOCl3 to V2O5 is difficult,and may result in a small amount of residual Cl in the ***,the effects of temperature and the H2O/VOCl3 molar ratio on the quantity of residual Cl were *** Cl concentration was found to decrease with increasing temperature or increasing H2O/VOCl3 molar ***,Cl was determined to be present only in the form of Cl-V bonds,while Cl-H and Cl-Cl bonds were not detected in a V2O5 product made at 200℃with a H2O/VOCl3 molar ratio of 18.A Cl concentration of less than 0.05 wt%was obtained under the optimal synthesis conditions,demonstrating that the FBCVD method is a viable means of preparing high purity V2O5 via the gaseous hydrolysis of VOCl3.

关键词： Chlorination procedure High purity VOCl3 FBCVD High purity V2O5 Gaseous hydrolysis Chlorine

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Transverse shear and normal deformation effects on vibration behaviors of functionally graded micro-beams

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Applied Mathematics and Mechanics(English Edition) 2020年第9期41卷 1303-1320页

作者： zhu SU Lifeng WANG Kaipeng SUN jie SUN State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China Shanghai Institute of Satellite Engineering Shanghai 201109China

A quasi-three dimensional model is proposed for the vibration analysis of functionally graded(FG)micro-beams with general boundary conditions based on the modified strain gradient *** consider the effects of transverse shear and nor-mal deformations,a general displacement field is achieved by relaxing the assumption of the constant transverse displacement through the *** conventional beam theories including the classical beam theory,the first-order beam theory,and the higher-order beam theory are regarded as the special cases of this *** material proper-ties changing gradually along the thickness direction are calculated by the Mori-Tanaka *** energy-based formulation is derived by a variational method integrated with the penalty function method,where the Chebyshev orthogonal polynomials are used as the basis function of the displacement *** formulation is validated by some comparative examples,and then the parametric studies are conducted to investigate the effects of transverse shear and normal deformations on vibration behaviors.

关键词： quasi-three dimensional theory modified strain gradient theory function-ally graded(FG)micro-beam size effect vibration general boundary condition

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Influence of silane coupling agent on the conversion film forming of galvanized steel treated with cerium salt

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International Journal of Minerals,Metallurgy and Materials 2012年第9期19卷 800-804页

作者： Li-hua Gong rui-rui Tang Yu-qiao zhu Dong-liang Chen School of Material Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

The influence of silane coupling agent on the film forming of galvanized steel treated with cerium salt was studied by scanning electron microscopy （SEM） and X-ray photoelectron spectroscopy （XPS）, and the corrosion resistance of conversion films was analyzed by electro interstitial scanning （EIS）. The results show that silane coupling agent KH-570 has significant influence on the compactness and homogeneity of cerium conversion films, and the process of film forming is promoted by increasing the content of tervalent and tetravalent cerium oxide. The impedance value of the cerium conversion film, especially modified with KH-570, is greater than that of the base metal, which reveals that it is necessary to add silane coupling agent to the film-forming solution in order to improve the corrosion resistance of the conversion film.

关键词： galvanized metal cerium compounds thin films silanes coupling agents

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Alternative Strategy for Development of Dielectric Calcium Copper Titanate‑Based Electrolytes for Low‑Temperature Solid Oxide Fuel Cells

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Nano-Micro Letters 2025年第1期17卷 310-332页

作者： Sajid Rauf Muhammad Bilal Hanif Zuhra Tayyab Matej Veis MAKYousaf Shah Naveed Mushtaq Dmitry Medvedev Yibin Tian Chen Xia Martin Motola Bin zhu College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060People’s Republic of China Department of Inorganic Chemistry Faculty of Natural SciencesComenius University BratislavaIlkovicova684215 BratislavaSlovakia Energy Storage Joint Research Center School of Energy and EnvironmentSoutheast UniversityNanjing 210096People’s Republic of China Hydrogen Energy Laboratory Ural Federal University620002 EkaterinburgRussia Laboratory of Electrochemical Devices Based on Solid Oxide Proton Electrolytes Institute of High Temperature Electrochemistry620066 EkaterinburgRussia School of Microelectronics Hubei UniversityWuhan 430062People’s Republic of China

The development of low-temperature solid oxide fuel cells(LT-SOFCs)is of significant importance for realizing the widespread application of *** has stimulated a substantial materials research effort in developing high oxide-ion conductivity in the electrolyte layer of *** this context,for the first time,a dielectric material,CaCu_(3)Ti_(4)O_(12)(CCTO)is designed for LT-SOFCs electrolyte application in this *** individual CCTO and its heterostructure materials with a p-type Ni_(0.8)Co_(0.15)Al_(0.05)LiO_(2−δ)(NCAL)semiconductor are evaluated as alternative electrolytes in LT-SOFC at 450–550℃.The single cell with the individual CCTO electrolyte exhibits a power output of approximately 263 mW cm^(-2) and an open-circuit voltage(OCV)of 0.95 V at 550℃,while the cell with the CCTO–NCAL heterostructure electrolyte capably delivers an improved power output of approximately 605 mW cm^(-2) along with a higher OCV over 1.0 V,which indicates the introduction of high hole-conducting NCAL into the CCTO could enhance the cell performance rather than inducing any potential short-circuiting *** is found that these promising outcomes are due to the interplay of the dielectric material,its structure,and overall properties that led to improve electrochemical mechanism in CCTO–***,density functional theory calculations provide the detailed information about the electronic and structural properties of the CCTO and NCAL and their heterostructure CCTO–*** study thus provides a new approach for developing new advanced electrolytes for LT-SOFCs.

关键词： LT-SOFCs Dielectric CaCu_(3)Ti_(4)O_(12) Semiconductor Ni_(0.8)Co_(0.15)Al_(0.05)LiO_(2−δ) Ionic conductivity Heterostructure electrolyte

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Multipartite Entanglement in Heisenberg Model

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Communications in Theoretical Physics 2008年第6期49卷 1449-1452页

作者： REN jie zhu Shi-Qun School of Physical Science and Technology Suzhou University Suzhou 215006 China

The effects of anisotropy and magnetic field on multipartite entanglement of ground state in Heisenberg XY model are investigated. The multipartite entanglement increases as a function of the inverse strength of the external field when the degree of anisotropy is finite. There are two peaks when the degree of anisotropy is γ=±1. When the degree of anisotropy increases further, the multipartite entanglement will decrease and tend to a constant. The threshold of the inverse strength of the external field for generating multipartite entanglement generally decreases with the increasing of qubits.

关键词： multipartite entanglement ground state Heisenberg model

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Parametric Gait Online Generation of a Lower-limb Exoskeleton for Individuals with Paraplegia

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Journal of Bionic Engineering 2018年第6期15卷 941-949页

作者： Tianjiao Zheng Yanhe zhu ZongweiZhang Sikai Zhao jie Chen jie Zhao State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin 150001 China School of Mechanical Engineering and Automation Northeastern University Shenyang 110819 China

Lower-limb exoskeletons can provide paraplegics with the ability to restore gait function. In the community ambulation, the user would frequently meet different floors, doorsills, and other obstacles. Therefore, parametric gait generation is a significant issue for this kind of exoskeletons. In this paper, a parametric gait online generation approach is proposed, which combines a parametric gait control method with a torque compensation control strategy, based on the state machine. In the torque compensation control, the reference tra- jectories of joint positions are obtained through compensating gravity, inertia, and friction, which is intent on the natural and well-directed source data. Based on the reference trajectories, the parametric gait control method is established, in which the gait can be controlled via three parameters： velocity, step-length, and step-height. Two test cases are performed on three healthy subjects. The results demonstrate that the parametric gait can be online generated smoothly and correctly, meanwhile every variable step can be triggered as users expect. The effectiveness and practicability of the gait generation approach proposed in this paper are validated. In addition, this research is the foundation of autonomous gait planning.

关键词： exoskeleton parametric gait gait online generation paraplegic bionic design

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