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Model predictive control of indoor thermal environment conditioned by a direct expansion air conditioning system

Building Simulation 2023年第3期16卷 357-378页

作者： Yudong Xia Ming Zhu Aipeng jiang jian wang Xiaoxia Bai Shiming Deng School of Automation(School of Artificial Intelligence) Hangzhou Dianzi UniversityHangzhouChina Department of Building Environment and Energy Engineering The Hong Kong Polytechnic UniversityHong KongChina Department of Mechanical and Industrial Engineering Qatar UniversityDohaQatar

Temperature and humidity are two important factors that influence both indoor thermal comfort and air *** varying compressor and supply fan speeds of a direct expansion(DX)air conditioning(A/C)unit,the air temperature and humidity in the conditioned space can be regulated ***,most existing controllers are designed to minimize the tracking errors between the system outputs with their corresponding settings as quickly as *** energy consumption,which is directly influenced by the compressor and supply fan speeds,is not considered in the relevant controller formulations,and thus the system may not operate with the highest possible energy *** effectively control temperature and humidity while minimizing the system energy consumption,a model predictive control(MPC)strategy was developed for a DX A/C system,and the development results are presented in this paper.A physically-based dynamic model for the DX A/C system with both sensible and latent heat transfers being considered was established and validated by *** facilitate the design of MPC,the physical model was further *** MPC scheme was then developed by formulating the objective function which sought to minimize the tracking errors of temperature and moisture content while saving energy *** on the results of command following and disturbance rejection tests,the proposed MPC scheme was capable of controlling temperature and humidity with adequate control accuracy and *** comparison to linear-quadratic-Gaussian(LQG)controller,better control accuracy and lower energy consumption could be realized when using the proposed MPC strategy to simultaneously control temperature and humidity.

关键词： direct expansion air conditioning humidity control model predictive control variable speed operational efficiency

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Influence of mechanical reduction amount on internal quality of continuous casting billets by thermal and numerical simulation

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Journal of Iron and Steel Research International 2023年第6期30卷 1234-1243页

作者： Dan-qing jiang Shu-jian Sun Han Wu Yang-jian Xu Fu-hai Zhu Zhen-qiang Zhang jiang wang Zhong-ming Ren School of Materials Science and Engineering Shanghai UniversityShanghai 200444China State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200444China

With establishment of thermal and numerical simulation models,the influence of reduction amount on solidification structure,segregation and shrinkage porosity of continuous casting(CC)billets was *** thermal–mechanical coupled simulation results indicated that with an increase in reduction amount,the temperature in the central area decreases,and the reduction efficiency firstly increases and then decreases,reaching the maximum value at reduction amount of 6 *** analysis showed that increasing the reduction amount is beneficial for the refinement of central solidification ***,the internal cracks are more likely to appear at higher reduction *** X-ray computerized tomography results revealed that a higher reduction amount can significantly reduce the volume fraction and equivalent diameter of the central shrinkage porosities of CC billets and increase the sphericity of ***,the macrosegregation of carbon along the central line is improved as the reduction amount increases;while the reduction amount exceeds 8 mm,the segregation degree will not change any more.

关键词： Mechanical reduction Solidification structure Porosity Thermal simulation Continuous casting billet

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High-throughput computational screening of oxide double perovskites for optoelectronic and photocatalysis applications

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Journal of Energy Chemistry 2021年第6期30卷 351-358,I0009页

作者： Xiaowei jiang Wan-jian Yin College of Energy Soochow Institute for Energy and Materials InnovationS(SIEMIS)Soochow UniversitySuzhou 215006JiangsuChina Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of jiangsu Province Soochow UniversitySuzhou 215006JiangsuChina Key Lab of Advanced Optical Manufacturing Technologies of jiangsu Province&Key Lab of Modern Optical Technologies of Education Ministry of China Soochow UniversitySuzhou 215006JiangsuChina

Oxide double perovskites A2 B’B"O6 are a class of emerging materials in the fields of optoelectronics and *** to the chemical flexibilities of perovskite structures,there are multiple elemental combinations of cations A,B’,and B",which leading to tremendous *** this study,we comprehensively screened stable oxide double perovskite A2 B’B"O6 from a pool of 2,018 perovskite candidates using a high-throughput computational *** considering a tolerance factor(t)-octahedral factor(μ) phase diagram,138 candidates with Fm 3 m, P21/c,and R3 c phases were selected and systematically studied via first-principles calculations based on density functional *** screening procedure finally predicted the existence of 21 stable perovskites,and 14 among them have never been *** with existing experimental results demonstrates that the prediction accuracy for perovskite formability is approximately 90%.The predicted oxide double perovskites exhibit quasi-direct bandgaps ranging from 0 to 4.4 eV with a significantly small direct-indirect bandgap difference,balanced electron and hole effective masses,and strong optical *** newly predicted oxide double perovskites may enlarge the pool of material candidates for applications in optoelectronics and *** study provides a route for computational screening of novel perovskites for functional applications.

关键词： Oxide double perovskites First-principles calculations High-throughput Optoelectronics Photocatalysis

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椒样薄荷脱毒苗的规模化生产研究

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安徽农业科学 2017年第17期45卷 122-123,173页

作者：郭丹丽王自健蒋新明路喆李敏徐盼盼王朴新疆生产建设兵团第四师农业科学研究所新疆伊宁835000

[目的]更新伊犁地区的椒样薄荷品种,对伊犁地区椒样薄荷进行提纯及复壮。[方法]采用组培技术对椒样薄荷品种进行茎尖脱毒、离体快繁及大规模生产。以椒样5号为材料,研究大规模生产下椒样薄荷茎尖分化、增殖、生根的最适激素浓度。[结果... 详细信息

[目的]更新伊犁地区的椒样薄荷品种,对伊犁地区椒样薄荷进行提纯及复壮。[方法]采用组培技术对椒样薄荷品种进行茎尖脱毒、离体快繁及大规模生产。以椒样5号为材料,研究大规模生产下椒样薄荷茎尖分化、增殖、生根的最适激素浓度。[结果]可使用白砂糖和琼脂条代替蔗糖、琼脂,降低经济成本;大规模生产时,最适椒样薄荷增殖培养基为1/2 MS+0.5 mg/L 6-BA+0.01 mg/L NAA,最适生根培养基为1/2 MS+0.10 mg/L NAA。[结论]大规模组培不同阶段所使用基本培养基不同,激素组合也不同,大规模生产时以经济节约为主;利用茎尖快繁技术可快速更新换代椒样薄荷品种。

关键词：椒样薄荷脱毒苗组织培养提纯复壮

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Experimental Study on Engineering Behavior of Solidified Soil for Scour Repair and Protection

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China Ocean Engineering 2024年第4期38卷 625-635页

作者： WU Xiao-ni LI Ru-yu SHU jian TANG Chao CHEN Jin-jian wang Hui-li jiang Hai-li wang Xiao State Key Laboratory of Ocean Engineering Department of Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Road and Bridge Group Co. Ltd.Shanghai 200433China Shanghai Engineering Research Center of Urban Infrastructure Renewal Shanghai 200032China jiangsu Kunze Technology Co. Ltd.Nanjing 210000China

A new scour countermeasure using solidified slurry for offshore foundation has been proposed *** solidified slurry is pumped to seabed area around foundation for scour protection or pumped into the developed scour holes for scour repair as the fluidized material solidifies *** the pumping operation and solidification,the engineering behaviors of solidified slurry require to be considered synthetically for the reliable application in scour repair and protection of ocean engineering such as the pumpability related flow value,flow diffusion behavior related rheological property,anti-scour performance related retention rate in solidification and bearing capacity related strength property after *** this study,a series of laboratory tests are conducted to investigate the effects of mix proportion(initial water content and binder content)on the flow value,rheological properties,density,retention rate of solidified slurry and unconfined compressive strength(UCS).The results reveal that the flow value increases with the water content and decreases with the binder *** the solidified slurry exhibits Bingham plastic behavior when the shear rate is larger than 5 s^(-1).The Bingham model has been employed to fit the rheology test results,and empirical formulas for obtaining the density,yield stress and viscosity are established,providing scientific support for the numerical assessment of flow and diffusion of solidified *** rate of solidified slurry decreases with the water flow velocity and flow value,which means the pumpability of solidified slurry is contrary to anti-scour *** unconfined compressive strength after solidification reduces as the water content increases and binder content decreases.A design and application procedure of solidified soil for scour repair and protection is also proposed for engineering reference.

关键词： scour repair and protection solidified soil pumpability strength flow properties anti-scour performance

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Mechanical defect identification for gas‐insulated switchgear equipment based on time‐frequency vibration signal analysis

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High Voltage 2021年第3期6卷 531-542页

作者： Yao Zhong jian Hao Ruijin Liao Xupeng wang Xiping jiang Feng wang State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing UniversityChongqingChina State Grid Chongqing Electric Power Company Chongqing Electric Power Research Institute ChongqingChina Shandong Taikai High‐Volt Switchgear Co. Ltd.Technology CenterTaianChina

Mechanical defect is an important reason for the failure of gas‐insulated switchgear(GIS)*** on the time‐frequency characteristic vibration signal analysis on five kinds of mechanical defects,a novel intelligent algorithm model combining complementary ensemble empirical mode decomposition(CEEMD)and genetic al-gorithm improved kernel fuzzy mean clustering(GAKFCM)was proposed to identify the mechanical defect ***,the mechanical defect platform and detection sys-tem were *** CEEMD and IMF sensitivity factors were used to analyse the time‐frequency signal of five kinds of vibration defects,and the feature extraction was performed on the processed vibration ***,the mechanical vibration defect recognition model was established based on the GAKFCM algorithm and its validity was *** show that the developed detection system can detect mechanical vibration signals *** values,frequency band lines and entropy can reflect the energy attenuation and distribution differences for different type of me-chanical defect vibration *** proposed GAKFCM clustering model combining the above vibration feature parameters can effectively find and diagnose the mechanical defect of GIS *** recognition accuracy reaches 96.74%,especially for the loose contact seat bolts and poor contact failures of the disconnector.

关键词： defect analysis vibration

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Interface interaction between SiO_(2) and magnetite under high temperature:particle migration and inhibition mechanism

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Journal of Iron and Steel Research International 2024年第3期31卷 561-572页

作者： Yao-zu wang jian-liang Zhang Qiang Cheng Hui-qing jiang Zheng-jian Liu Yu-bo Tan School of Intelligent Science and Technology University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Advanced Engineering University of Science and Technology BeijingBeijing 100083China

Silicon is one of the main gangue components in iron ore,usually in the form of quartz and *** studies have shown that SiO_(2) has a two-sided effect on the consolidation of pellets during high-temperature oxidation roasting of ***,it is very difficult to capture the structural evolution and migration mechanisms during high-tem-perature roasting process by existing experimental ***,the influence of SiO_(2) on the consolidation behavior of magnetite was studied through a series of roasting experiments and molecular dynamic *** results show that the consolidation index and particle growth index decrease with the increase in SiO_(2) content in the *** 1573 K,the liquid phase promotes the recrystallization growth of hematite at high *** dynamic study shows that it is difficult for quartz SiO_(2) to form sintering neck with Fe_(2)O_(3).When the calcination temperature is higher than 1400 K,the Fe_(2)O_(3)-Fe_(2)SiO_(4) system produces a considerable sintering neck structure after *** atomic migration ability of Fe_(2)SiO_(4) is much higher than that of Fe_(2)O_(3).The higher atomic migration ability of Fe_(2)SiO_(4) is the main reason for the formation of the sintering neck.

关键词： Sintering neck Crystal growth Consolidation Molecular dynamics SiO_(2)

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Erasable Ferroelectric Domain Wall Diodes

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Chinese Physics Letters 2021年第1期38卷 121-124页

作者： Wei Zhang Chao wang jian-Wei Lian Jun jiang An-Quan jiang State Key Laboratory of ASIC&System School of MicroelectronicsFudan UniversityShanghai 200433China

The unipolar diode-like domain wall currents in LiNbO3 single-crystal nanodevices are not only attractive in terms of their applications in nonvolatile ferroelectric domain wall memory,but also useful in half-wave and full-wave rectifier systems,as well as detector,power protection,and steady voltage *** traditional diodes,where the rectification functionality arises from the contact between n-type and p-type conductors,which are unchanged after off-line production,ferroelectric domain wall diodes can be reversibly created,erased,positioned,and shaped,using electric *** demonstrate such functionality using ferroelectric mesa-like cells,formed at the surface of an insulating X-cut LiNbO_(3) single *** the application of an in-plane electric field above a coercive field along the polar Z axis,the domain within the cell is reversed to be antiparallel to the unswitched bottom domain via the formation of a conducting domain *** wall current was rectified using two interfacial volatile domains in contact with two side Pt *** the nonvolatile inner domain wall,the interfacial domain walls disappear to turn off the wall current path after the removal of the applied electric field,or under a negative applied voltage,due to the built-in interfacial imprint *** novel devices have the potential to facilitate the random definition of diode-like elements in modern large-scale integrated circuits.

关键词： switched ferroelectric interfacial

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Novel Nanotrees of Crystalline Nickel Formed via Electrolytic Approach

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Nano-Micro Letters 2011年第4期3卷 264-269页

作者： jian wang Liying Zhang Liangming Wei Chuanhai jiang Yafei Zhang Key Laboratory for Thin Film and Microfabrication of the Ministry of Education Research Institute of Micro/Nano Science and TechnologySchool of Materials Science and EngineeringShanghai Jiao Tong University

Tree-shaped nickel nanocrystals with long main trunk and highly ordered branches were prepared via electrolytic method in ethylene glycol solution. The morphology and structures of nanotrees of crystalline nickel can be controlled by the processing of the surfactant(PVP) and electrolytic voltage. Magnetic property measurements at room temperature indicated that the as-prepared nanotrees of crystalline nickel possess higher saturation magnetism(MS) and coercivity(HC) than those of corresponding bulk nickel materials.

关键词： Nickel crystals Nanotrees Hysteresis loop Thermogravimetric analysis

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Integrity assurance of GNSS-based train integrated positioning system

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Science China(Technological Sciences) 2011年第7期54卷 1779-1792页

作者： LIU jiang TANG Tao GAI BaiGen wang jian CHEN Dewang State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing 100044 China School of Electronic and Information Engineering Beifing Jiaotong University Beijing 100044 China

This paper presents a novel Autonomous Integrity Monitoring and Assurance （AIMA） scheme for integrity assurance of the GNSS-based train integrated positioning system. In this scheme, integrity assurance strategies are combined with a three-stage hierarchical architecture, considering the coupling effects among sensor collection, sensor fusion and matching decision level in train integrated positioning. In sensor collecting stage, the AIMA scheme deals with sensor faults and failures with a PCA-based fault detection, diagnosis and isolation approach. In multi-sensor fusion stage, a novel cubature point H0o filter is presented to enhance the fault tolerance capability, and a hybrid approach is applied to indicating and monitoring the protection level of position estimation, concerning both the estimating covariance and measurement slopes. In map matching stage, hypothesis testing with specific test statistic is carried out to determine effectiveness of positioning results. Position calculation will be invalid with an alarm triggered if the specific integrity criterion is not satisfied in any stage. Since independent solutions are applied in AIMA, integrity assurance is closely coupled with information processing in train integrated positioning. Numerical results of the three cases correspond to the hierarchical architecture with field data and simulations are presented to illustrate features and applicability of the proposed AIMA scheme and specific solutions.

关键词： train positioning integrated positioning GNSS integrity assurance

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