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Lead-free thermochromic perovskites with tunable transition temperatures for smart window applications

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Science China Chemistry 2019年第9期62卷 1257-1262页

作者： Jingwen Li Xiaolong Liu Peixin Cui Junmeng Li Tao Ye Xi Wang chuang zhang Yong Sheng Zhao Key Laboratory of Photochemistry Institute of Chemistry Chinese Academy of Science Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China Institute of Soil Science Chinese Academy of Sciences Nanjing 210000 China Department of Physics School of Science Beijing Jiaotong University Beijing 100044 China

The structural flexibility of hybrid perovskite materials allows for phase transition and consequently thermochromic *** we investigate the thermochromic performance in a series of copper-based layered perovskites with organic cations having different alky chain lengths. Their transition temperature is found to be dependent on the organic cations due to molecular motion and hydrogen bond interaction, providing possibilities to prepare thermochromic semiconductors near room temperature for smart window applications.

关键词： lead-free perovskites thermochromic transition alkyl ammonium ions layered structures smart windows

Designing Unpowered Shoulder Complex Exoskeleton via Contralateral Drive for Self-rehabilitation of Post-stroke Hemiparesis

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Journal of Bionic Engineering 2023年第3期20卷 992-1007页

作者： Ning Li Tie Yang Yang Yang Wenyuan Chen Peng Yu chuang zhang Ning Xi Ying Zhao Wenxue Wang State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang110016China Institutes for Robotics and Intelligent Manufacturing Chinese Academy of SciencesShenyang110169China University of Chinese Academy of Sciences Beijing100049China Emerging Technologies Institute Department of Industrial and Manufacturing Systems EngineeringUniversity of Hong KongPokfulamHong Kong999077China Department of General Surgery Shengjing Hospital of China Medical UniversityShenyang110004China

Rehabilitation using exoskeleton robots can effectively remediate dysfunction and restore post-stroke survivors’ physical ability. However, low kinematic compatibility and poor self-participation of post-stroke patients in rehabilitation restrict the outcomes of exoskeleton-based therapy. The study presents an Unpowered Shoulder Complex Exoskeleton (USCE), consisting of Shoulder Girdle Mechanism (SGM), Ball-and-Socket Joint Mechanism (BSM), Gravity Compensating Mechanism (GCM) and Adjustable Alignment Design (AAD), to achieve self-rehabilitation of shoulder via energy transfer from the healthy upper limb to the affected counterpart of post-stroke hemiplegic patients. The SGM and AAD are designed to improve the kinematic compatibility by compensating for displacements of the glenohumeral joint with the adaptable size of USCE for different wearers. The BSM and GCM can transfer the body movement and energy from the healthy half of the body to the affected side without external energy input and enhance the self-participation with sick posture correction. The experimental results show that the USCE can provide high kinematic compatibility with 90.9% movement similarity between human and exoskeleton. Meanwhile, the motion ability of a post-stroke patient’s affected limb can be increased through energy transfer. It is expected that USCE can improve outcomes of home-based self-rehabilitation.

关键词： Unpowered exoskeleton Health-paralysis combination Energy transfer Self-rehabilitation Shoulder mechanism design

Plant-based meat substitutes by high-moisture extrusion:Visualizing the whole process in data systematically from raw material to the products

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Journal of Integrative Agriculture 2022年第8期21卷 2435-2444页

作者： zhang Jin-chuang MENG Zhen CHENG Qiong-ling LI Qi-zhai zhang Yu-jie LIU Li SHI Ai-min WANG Qiang Institute of Food Science and Technology Chinese Academy of Agricultural Sciences/Key Laboratory of Agro-Products ProcessingMinistry of Agriculture and Rural AffairsBeijing 100193P.R.China Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190P.R.China

High-moisture extrusion technology should be considered one of the best choices for producing plant-based meat substitutes with the rich fibrous structure offered by real animal meat ***,the extrusion process has been seen as a“black box”with limited information about what occurs inside,causing serious obstacles in developing meat *** study designed a high-moisture extrusion process and developed 10 new plant-based meat substitutes comparable to the fibrous structure of real animal *** study used the Feature-Augmented Principal Component Analysis(FA-PCA)method to visualize and understand the whole extrusion process in three ways systematically and *** established six sets of mathematical models of the high-moisture extrusion process based on 8000 pieces of data,including five types of *** FA-PCA method improved the R^(2) values significantly compared with the PCA *** Way 3 was the best to predict product quality(Z),demonstrating that the gradually molecular conformational changes(Y^(n'))were critical in controlling the final quality of the plant-based meat ***,the first visualization platform software for the high-moisture extrusion process has been established to clearly show the“black box”by combining the virtual simulation *** the software,some practice work such as equipment installation,parameter adjustment,equipment disassembly,and data prediction can be easily achieved.

关键词： plant-based meat substitutes high-moisture extrusion process extrusion parameters models visualization platform software

Extension of Flow Behaviour and Damage Models for Cast Iron Alloys with Strain Rate Effect

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Chinese Journal of Mechanical Engineering 2024年第3期37卷 297-310页

作者： chuang Liu Dongzhi Sun Xianfeng zhang Florence Andrieux Tobias Gersterc School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China Fraunhofer Institute for Mechanics of Materials(IWM) 79108 FreiburgGermany Fraunhofer Institute for High Speed Dynamics Ernst-Mach-Institute(EMI)79104 FreiburgGermany

Cast iron alloys with low production cost and quite good mechanical properties are widely used in the automotive *** study the mechanical behavior of a typical ductile cast iron(GJS-450)with nodular graphite,uni-axial quasi-static and dynamic tensile tests at strain rates of 10^(-4),1,10,100,and 250 s^(-1)were carried *** order to investigate the influence of stress state on the deformation and fracture parameters,specimens with various geometries were used in the *** strain curves and fracture strains of the GJS-450 alloy in the strain rate range of 10^(-4)to 250 s^(-1)were obtained.A strain rate-dependent plastic flow model was proposed to describe the mechanical behavior in the corresponding strain-rate *** available damage model was extended to take the strain rate into account and calibrated based on the analysis of local fracture *** with the proposed plastic flow model and the damage model were conducted to observe the deformation and fracture *** results show that the strain rate has obviously nonlinear effects on the yield stress and fracture strain of GJS-450 *** predictions with the proposed plastic flow and damage models at various strain rates agree well with the experimental results,which illustrates that the rate-dependent plastic flow and damage models can be used to describe the mechanical behavior of cast iron alloys at elevated strain *** proposed plastic flow and damage models can be used to describe the deformation and fracture analysis of materials with similar properties.

关键词： Dynamic behavior of materials Strain rate dependency Damage model Voce model Cast iron

Imaging a force field via an optically levitated nanoparticle array

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Chinese Physics B 2024年第9期33卷 179-184页

作者： Bihu Lv Jiandong zhang chuang Li Research Center for Novel Computing Sensing and Intelligent Processing Zhejiang LaboratoryHangzhou 311121China School of Mathematics and Physics Jiangsu University of TechnologyChangzhou 213001China

Levitated optomechanical systems represent an excellent candidate platform for force and acceleration *** propose a force-sensing protocol utilizing an optically levitated nanoparticle *** our scheme,N nanoparticles are trapped in an optical cavity using holographic optical *** external laser drives the cavity,exciting N cavity modes interacting simultaneously with the N *** optomechanical interaction encodes the information of the force acting on each nanoparticle onto the intracavity photons,which can be detected directly at the output ports of the ***,our protocol enables real-time imaging of a force field.

关键词： optomechanics levitated nanoparticles force field detection

Early Mineralization Age of the Hengjian Uranium Deposit: Constraints from Zircon SIMS U-Pb Dating

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Acta Geologica Sinica(English Edition) 2020年第1期94卷 212-213页

作者： HE Sheng LI Ziying GUO Dongfa WANG Yongjian zhang chuang GUO Jian FAN Zengwei Beijing Research Institute of Uranium Geology Beijing 100029China

Objective The Hengjian uranium deposit is a typical hydrothermal deposit in the Xiangshan uranium ore *** uranium mineralization ages of the Xiangshan deposits are poorly constrained,and only a few mineralization ages using the pitchblende U–Pb method have been *** ages are commonly discordant and dispersed for abundant inclusions and an open U–Pb *** grains after strong hydrothermal alteration are usually characterized by high common Pb contents,and their U–Pb isochron ages recorded the hydrothermal alteration event without interference of common Pb *** Hengjian gray/grayish-green granite porphyry experienced strong alteration by hydrothermal fluids during the pervasive uranium mineralization in the Xiangshan uranium ore *** mineralization in the Hengjian deposit may had different stages,and strong hydromicatization alteration occurred at a relatively early *** altered zircon U–Pb isochron ages possibly represent relatively early mineralization age of the Xiangshan uranium *** zircon grains from the Hengjian granite porphyry were analyzed using the secondary ion mass spectrometry(SIMS)U-Pb method in this study,and U–Pb isochron ages were measured to constrain the relatively early mineralization age of the Hengjian uranium deposit.

关键词： Constraints from Zircon SIMS U-Pb Dating Early Mineralization Age of the Hengjian Uranium Deposit

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水泥回转窑一键升温系统的开发与应用

水泥技术 2024年第2期 28-33页

作者：赵华张闯马纯辉李志丹臧剑波中才邦业(杭州)智能技术有限公司浙江杭州310022 湖州槐坎南方水泥有限公司浙江长兴313100

某7 500t/d水泥熟料生产线采用回转窑系统一键升温方案,应用新型智能控制平台软件,内置标准升温曲线程序,通过人工设置参数,改造现场装置及执行机构,按照烟室温度节点,控制中控设备开关量与执行器模拟量,实现了水泥回转窑的一键升温,达... 详细信息

某7 500t/d水泥熟料生产线采用回转窑系统一键升温方案,应用新型智能控制平台软件,内置标准升温曲线程序,通过人工设置参数,改造现场装置及执行机构,按照烟室温度节点,控制中控设备开关量与执行器模拟量,实现了水泥回转窑的一键升温,达到了“慢升温、不回头、均匀烘窑”的升温要求,大大降低了劳动强度,有效减少了因升温速率不当导致的耐火材料损坏,实现了升温过程中启停设备及参数调整的标准化。

关键词：水泥回转窑一键升温升温曲线智能控制耐火材料

End-to-End Joint Multi-Object Detection and Tracking for Intelligent Transportation Systems

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Chinese Journal of Mechanical Engineering 2023年第5期36卷 280-290页

作者： Qing Xu Xuewu Lin Mengchi Cai Yu‑ang Guo chuang zhang Kai Li Keqiang Li Jianqiang Wang Dongpu Cao School of Vehicle and Mobility Tsinghua UniversityBeijing 100084China Horizon Information Technology Co. Ltd.Beijing 100096China School of Transportation Science and Engineering Beihang UniversityBeijing 100191China Dongfeng USharing Technology Co. Ltd.Wuhan 430000China Department of Mechanical and Mechatronics Engineering University of WaterlooWaterlooON N2L 3G1Canada

Environment perception is one of the most critical technology of intelligent transportation systems(ITS).Motion interaction between multiple vehicles in ITS makes it important to perform multi-object tracking(MOT).However,most existing MOT algorithms follow the tracking-by-detection framework,which separates detection and tracking into two independent segments and limit the global ***,a few algorithms have combined feature extraction into one network;however,the tracking portion continues to rely on data association,and requires com‑plex post-processing for life cycle *** methods do not combine detection and tracking *** paper presents a novel network to realize joint multi-object detection and tracking in an end-to-end manner for ITS,named as global correlation network(GCNet).Unlike most object detection methods,GCNet introduces a global correlation layer for regression of absolute size and coordinates of bounding boxes,instead of ofsetting *** pipeline of detection and tracking in GCNet is conceptually simple,and does not require compli‑cated tracking strategies such as non-maximum suppression and data *** was evaluated on a multivehicle tracking dataset,UA-DETRAC,demonstrating promising performance compared to state-of-the-art detectors and trackers.

关键词： Intelligent transportation systems Joint detection and tracking Global correlation network End-to-end tracking

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疏松砂岩多层气藏钻井难点及优化对策

能源与节能 2024年第2期 127-132页

作者：宋维春张闯赵维超邢星黄成贵中国石油青海油田公司钻采工艺研究院甘肃敦煌736202

涩北气田是典型的疏松砂岩气藏,具有纵向气层多、储层疏松非均质性强、敏感性矿物多等地质特征。利用大量的气藏地质、动态监测和钻录测资料,剖析钻井施工中存在的问题和技术难点,开展优化对策研究。结果表明:1)储层疏松、薄互层多、矿... 详细信息

涩北气田是典型的疏松砂岩气藏,具有纵向气层多、储层疏松非均质性强、敏感性矿物多等地质特征。利用大量的气藏地质、动态监测和钻录测资料,剖析钻井施工中存在的问题和技术难点,开展优化对策研究。结果表明:1)储层疏松、薄互层多、矿化度高和开发后期纵向压力系统紊乱是影响优快钻井施工的主要因素;2)针对钻井施工中井控风险大、井身结构确定困难的问题,通过优化研究确定了不同气藏、不同深度、不同部位井的井身结构;3)针对比较突出的井漏问题,研发适宜的低伤害、能有效抑制黏土膨胀的MEG (甲基葡萄糖苷)钻井液体系;4)针对固井质量难以保证的问题,采用纳米基低密度水泥浆、工艺改进和精细施工等措施得以解决。认为,优化技术对策应用效果明显,解决了钻井技术难点,实现了疏松砂岩多层气藏快速安全钻井。

关键词：疏松砂岩气藏井身结构固井质量井漏低密度水泥浆