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Effects of different root zone heating systems on the microclimate and crop development in solar greenhouses

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International Journal of Agricultural and Biological Engineering 2022年第6期15卷 67-72页

作者： Fen He Jing Tian Liu Wang yong hou Fei Qi Yanping Zhang Libao zhu Zhonghua Li Academy of Agricultural Planning and Engineering Ministry of Agriculture and Rural AffairsBeijing 100125China Key Laboratory of Farm Building in Structure and Intelligent Construction Ministry of Agriculture and Rural AffairsBeijing 100125China Hebei Agricultural University Baoding 071001HebeiChina

Heating greenhouse is indispensable for plant development particularly in winter when the air temperature is *** that sense,root zone heating is more energy-saving than traditional air *** current work was devoted to the study of the effect of two root zone heating systems based on carbon crystal electrothermal film and low temperature hot water pipe on the microclimate and tomato yield in solar *** their performance was tested in the coldest period of winter in yongqing County of Hebei *** results showed that the use of root zone heating system can improve the average substrate temperature by 6.8℃.This microclimate improvement had a positive impact on tomato *** output per square meter has increased by 19%compared to the *** was also noted that the presence of root zone heating leads to a decrease in the development of disease in heated *** on these results,the root zone heating system can be an effective method of improving the environmental temperature of crop plant,which is of great significance for increasing crop yield.

关键词： solar greenhouse root zone heating substrate temperature air temperature tomato trough cultivation

Scalable carbon black deposited fabric/hydrogel composites for affordable solar-driven water purification

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Journal of Materials Science & Technology 2022年第11期106卷 10-18页

作者： Ying Guo Congqi Li Peiling Wei Kai hou Meifang zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Interfacial solar-driven evaporators have presented great potential for water purification owing to their low energy consumption and high steam generation efficiency. However, their further applications are hindered by the high costs and complicated fabrication processes. Here, a scalable bilayer interfacial evaporator was constructed via an affordable technique, in which carbon black deposited nonwoven fabric(CB@NF) was employed as the upper photothermal layer, as well as PVA/starch hybrid hydrogel for selffloating and water transport. Under simulated one sun irradiation, CB@NF layer displayed excellent photothermal conversion performance, whose temperature could increase 30.4 ℃ within 15 min. Moreover,the introduction of starch into PVA endowed the hybrid hydrogels with considerable water-absorption capability on the premise of ensuring mechanical properties. The resultant CB@NF/PVA/starch composites achieved superior interfacial adhesion performance with interfacial toughness at about 200 J *** with good evaporation performance, salt-rejection property and high purification efficiency on pollutants, this evaporation system would become a promising candidate to alleviate water shortage.

关键词： Fabric/hydrogel composite Interfacial solar-driven evaporation Water purification

Simulation and design of a heat-integrated double-effect reactive distillation process for propylene glycol methyl ether production

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Chinese Journal of Chemical Engineering 2022年第12期52卷 103-114页

作者： Ran An Shengxin Chen Shun hou Yuting zhu Chunhu Li Xinbao zhu Ruixia Liu Weizhong An Department of Chemical Engineering Ocean University of ChinaQingdao 266100China Beijing Key Laboratory of Ionic Liquids Clean Process CAS Key Laboratory of Green Process and EngineeringState Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China College of Chemical Engineering Nanjing Forestry UniversityNanjing 210037China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

A double-effect reactive distillation(DERD)process was proposed for the production of propylene glycol methyl ether from propylene oxide and methanol to overcome the shortcoming of low selectivity and high-energy consumption in the tubular plug-flow reactor.A single-column reactive distillation(RD)process was conducted under optimized operating conditions based on sensitivity analysis as a *** results demonstrated that the proposed DERD process is able to achieve more than 95%selectivity of the desired *** that,a design approach of the DERD process with an objective of the minimum operating cost was proposed to achieve further energy savings in the RD *** proposed DERD configuration can provide a large energy-savings by totally utilization of the overhead vapor steam in the high-pressure RD column.A comparison of the single-column RD process revealed that the proposed DERD process can reduce the operating cost and the total annual cost of 25.3%and 30.7%,respectively,even though the total capital cost of DERD process is larger than that of the RD process.

关键词： Propylene oxide Reactive distillation Heat integration Propylene glycol monomethyl ether Process simulation

Scheduling Dual-Arm Multi-Cluster Tools With Regulation of Post-Processing Time

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IEEE/CAA Journal of Automatica Sinica 2023年第8期10卷 1730-1742页

作者： Qinghua zhu Bin Li Yan hou Hongpeng Li Naiqi Wu IEEE the School of Computer Science and Technology Guangdong University of TechnologyGuangzhou 510006China the Institute of Systems Engineering and Collaborative Laboratory for Intelligent Science and Systems Macao University of Science and TechnologyMacao 999078China

As wafer circuit width shrinks down to less than ten nanometers in recent years,stringent quality control in the wafer manufacturing process is increasingly *** to the coupling of neighboring cluster tools and coordination of multiple robots in a multi-cluster tool,wafer production scheduling becomes rather *** a wafer is processed,due to high-temperature chemical reactions in a chamber,the robot should be controlled to take it out of the processing chamber at the right *** order to ensure the uniformity of integrated circuits on wafers,it is highly desirable to make the differences in wafer post-processing time among the individual tools in a multicluster tool as small as *** achieve this goal,for the first time,this work aims to find an optimal schedule for a dual-arm multi-cluster tool to regulate the wafer post-processing *** do so,we propose polynomial-time algorithms to find an optimal schedule,which can achieve the highest throughput,and minimize the total post-processing time of the processing *** propose a linear program model and another algorithm to balance the differences in the post-processing time between any pair of adjacent cluster *** industrial examples are given to illustrate the application and effectiveness of the proposed method.

关键词： Cluster tool optimization scheduling

Topology optimization of joint load control with geometrical nonlinearity

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Chinese Journal of Aeronautics 2020年第1期33卷 372-382页

作者： Jie hou Xiaojun GU Jihong zhu Jie WANG Weihong ZHANG State IJR Center of Aerospace Design and Additive Manufacturing Northwestern Polytechnical University710072 Xi’anChina Institute of Intelligence Material and Structure Unmanned System TechnologiesNorthwestern Polytechnical University710072 Xi’anChina MIIT Lab of Metal Additive Manufacturing and Innovative Design Northwestern Polytechnical University710072 Xi’anChina

This paper presents an extended topology optimization approach considering joint load constraints with geo-metrical nonlinearity in design of assembled *** geometrical nonlinearity is firstly included to reflect the structural response and the joint load distribution under large *** avoid a failure of fastener joints,topology optimization is then carried out to minimize the structural end compliance in the equilibrium state while controlling joint loads intensities over *** nonlinear analysis and optimization,a novel implementation of adjoint vector sensitivity analysis along with super element condensation is introduced to address numerical instability *** degrees of freedom of weak regions are condensed so that their influences are excluded from the iterative Newton-Raphson(NR)*** examples are presented to validate the efficiency and robustness of the proposed *** effects of joint load constraints and geometrical nonlinearity are highlighted by comparing numerical optimization results.

关键词： Geometrical nonlinearity Joint load constraint Sensitivity analysis Super element condensation Topology optimization

Application of machine learning to process simulation of n-pentane cracking to produce ethylene and propene

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Chinese Journal of Chemical Engineering 2020年第7期28卷 1832-1839页

作者： Weijun zhu Xingwang Liu Xu hou Jiayao Hu Zhenheng Diao School of Chemical Engineering Changchun University of TechnologyChangchun 130012China School of Mathematics and Statistics Changchun University of TechnologyChangchun 130012China

Modeling light olefin production was one of the main concerns in chemical engineering *** this paper,machine learning model based on artificial neural networks(ANN)was established to describe the effects of temperature and catalyst on ethylene and propene formation in n-pentane *** establishment procedure included data pretreatment,model design,training process and testing process,and the mean square error(MSE)and regression coefficient(R2)indexes were employed to evaluate model *** was found that the learning algorithm and ANN topology affected the calculation ***24223,CGB2423,and LM24223 models were established by optimally matching the learning algorithm with ANN topology,and achieved excellent calculation ***,the stability of GD24223,CGB2423 and LM24223 models was investigated by gradually decreasing training data and simultaneously transforming data *** with GD24223 and LM24223 models,CGB2423 model was more stable against the variations of training data,and the MSE values were always maintained at the magnitude of 10^-3-10^-4,confirming its applicability for simulating light olefin production in n-pentane cracking.

关键词： Machine learning ANN Calculation accuracy Light olefins n-Pentane cracking

Task Scheduling for Multi-Cloud Computing Subject to Security and Reliability Constraints

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IEEE/CAA Journal of Automatica Sinica 2021年第4期8卷 848-865页

作者： Qing-Hua zhu Huan Tang Jia-Jie Huang Yan hou School of Computer Science and Technology Guangdong University of TechnologyGuangzhou 510006China

The rise of multi-cloud systems has been *** safety-critical missions,it is important to guarantee their security and *** address trust constraints in a heterogeneous multi-cloud environment,this work proposes a novel scheduling method called matching and multi-round allocation(MMA)to optimize the makespan and total cost for all submitted tasks subject to security and reliability *** method is divided into two phases for task *** first phase is to find the best matching candidate resources for the tasks to meet their preferential demands including performance,security,and reliability in a multi-cloud environment;the second one iteratively performs multiple rounds of re-allocating to optimize tasks execution time and cost by minimizing the variance of the estimated completion *** proposed algorithm,the modified cuckoo search(MCS),hybrid chaotic particle search(HCPS),modified artificial bee colony(MABC),max-min,and min-min algorithms are implemented in CloudSim to create *** simulations and experimental results show that our proposed method achieves shorter makespan,lower cost,higher resource utilization,and better trade-off between time and economic *** is more stable and efficient.

关键词： Multi-cloud environment multi-quality of service(QoS) reliability security task scheduling

Molecular levers enable anomalously enhanced strength and toughness of cellulose nanocrystal at cryogenic temperature

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Nano Research 2023年第5期16卷 8036-8041页

作者： YuanZhen hou Jun Xia ZeZhou He YinBo zhu HengAn Wu CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsCAS Center for Excellence in Complex System MechanicsUniversity of Science and Technology of ChinaHefei 230027China Faculty of Civil Engineering and Mechanics Jiangsu UniversityZhenjiang 212013China

The quest for widespread applications especially in extreme environments accentuates the necessity to design materials with robust mechanical and thermodynamic *** all existing materials yield temperature-variant mechanical properties,essentially determined by their different atomic bonding *** general,weak non-covalent interactions are considered to diminish the structural anti-destabilization of covalent crystals despite the toughening ***,starting from multiscale theoretical modeling,we herein reveal an anomalous stabilizing effect in cellulose nanocrystals(CNCs)by the cooperation between the non-covalent hydrogen bonds and covalent glucosidic skeleton,namely molecular levers(MLs).It is surprising to find that the hydrogen bonds in MLs behave like covalent bindings under cryogenic conditions,which provide anomalously enhanced strength and toughness for *** analyses demonstrate that the unique dynamical mechanical behaviors from ambient to deep cryogenic temperatures are synergetic results of the intrinsic temperature dependence veiled in MLs and the overall thermo-induced CNC destabilization/*** the consequence,the variation trend of mechanical strength exhibits a bilinear temperature dependence with~77 K as the turning *** underlying investigations not only establish the bottom–up interrelations from the hydrogen bonding thermodynamics to the crystal-scale mechanical properties,but also facilitate the potential application of cellulose-based materials at extremely low temperatures such as those in outer space.

关键词： cellulose nanocrystal molecular lever thermodynamic stability thermo-mechanical behavior cryogenic temperature

On-line optimal autonomous reentry guidance based on improved Gauss pseudospectral method

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Science China(Information Sciences) 2014年第5期57卷 244-259页

作者： SUN yong hou MingZhe DUAN GuangRen LIANG XiaoLing Center for Control Theory and Guidance Technology Harbin Institute of Technology Nanjing Research Institute of Electronics Technology

The on-line optimal autonomous reentry guidance of the hypersonic vehicle is proposed based on the improved Gauss pseudospectral method(IGPM).The autonomous reentry guidance requires the hypersonic vehicle can generate the optimal trajectory for the latest flight mission on line and track the new trajectory well under the *** two problems are simplified into a nonlinear optimal control problem with nonlinear *** IGPM is introduced to solve the above two *** trajectory has to change according to the flight mission and therefore the new optimal trajectory can be obtained by IGPM within about10 *** optimal feedback guidance law is used to track the reference trajectory to handle the *** order to deal with the CPU time delay,which comes from optimizing the new trajectory,the new on-line optimal autonomous reentry guidance is ***,the numerical simulation shows that the proposed autonomous guidance can generate optimal trajectory for the new flight mission and have a high tracking accuracy.

关键词： optimal autonomous reentry guidance improved gauss pseudospectral method hypersonic vehicle optimal feedback guidance