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Journal of Thermal Science 2022年第5期31卷 1367-1379页

作者： BAI tao LIU Ye yan Gang YU Jianlin Department of Refrigeration and Cryogenic Engineering School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an710049China

In this paper,an ejector enhanced high-temperature heat pump with dual-pressure condensation and evaporation is proposed to improve the system *** analyses of the system operation characteristics are conducted using energetic and exergetic *** performance comparisons among the basic cycle,parallel compression cycle,and ejector enhanced cycle are conducted with six different refrigerants,including R245fa,R600a,R1234ze(Z),R1336mzz(Z),R1224yd(Z),and R1233zd(E).The results demonstrate that environmentally-friendly refrigerant R1234ze(Z)would be a promising alternative *** with the basic cycle and parallel compression cycle at selected operation conditions,29.5%and 12.6%improvements in COP,and 16.7%and 11.1%higher system exergy efficiency are achieved in the ejector enhanced cycle on *** volumetric heating capacity of the ejector enhanced cycle is increased by 15.7%–21.7%.The ejector enhanced cycle outperforms the other two cycles in high-temperature heat pump applications at the large temperature lift and temperature rise in the heat *** assessment offers an option to improve the energy utilization efficiency of the high-temperature heat pumps.

关键词： thermodynamics exergy high-temperature heat pump ejector dual-temperature condensation/evaporation

Iontronic components: From liquid- to solid-states

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Nano Research 2023年第12期16卷 13343-13357页

作者： tao Xiao Xing Zhao Yuchun Zhang Yong yan CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Chemistry and Biological Engineering University of Science and Technology BeijingBeijing 100083China

In modern electronics,the ionic charges have not occupied the same role as the electrons mainly because of their relatively low ***,these“slow”charge carriers contribute to brain computing with high efficiency and extremely low power *** by the“ionic”life,iontronic components have recently attracted considerable *** this review,we first introduce the progress of iontronic devices operating with the involvement of water,specifically,two types of systems—nanofluidic and ***,the issues and challenges within these liquid-state ionic devices are *** avoid the negative impact of water,we also propose two solid-state materials—ionogels and charged metal nanoparticles—to construct several basic ionic devices such as diodes and ***,we summarize this review and outlook the promising directions for the further developments of iontronic devices.

关键词： ionic charges liquid-/solid-state diode transistor

Performance Analysis of an Ejector Enhanced Two-Stage Auto-Cascade Refrigeration Cycle for Low Temperature Freezer

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Journal of Thermal Science 2021年第6期30卷 2015-2026页

作者： BAI tao LU Yu yan Gang YU Jianlin Department of Refrigeration and Cryogenic Engineering School of Energy and Power EngineeringXi5an Jiaotong UniversityXi'an 710049China

In this paper,an ejector enhanced two-stage auto-cascade refrigeration cycle(EARC)using ternary mixture R600a/R32/R1150 is proposed for application of-80℃*** EARC cycle,an ejector was employed to recover the expansion work in the throttling processes and lifted the suction pressure of the *** performances of the ejector enhanced two-stage auto-cascade refrigeration cycle and conventional auto-cascade refrigeration cycle(CARC)were compared using thermodynamic analysis *** influences of the important operation parameters including mass fraction ratio of the mixture,fluid quality at the second separator inlet,condensation temperature,evaporation temperature,and expansion ratio of expansion valve on the performances of EARC cycle were discussed in *** results indicate that ternary mixture R600a/R32/R1150 has the optimal mass fraction ratio of 0.45/0.2/0.35 with respect to the maximum *** EARC cycle yields higher performance than the CARC cycle in terms of COP,exergy efficiency and volumetric refrigeration *** 4.9%-36.5%improvement in COP and 6.9%-34.3%higher exergy efficiency could be obtained in EARC cycle comparing with CARC *** finding of this study suggests that the EARC cycle has a promising application potential for low temperature freezing.

关键词： two-stage auto-cascade refrigeration zeotropic mixture ejector performance improvement exergy analysis

Influence of reaction of Al2O3 and carbonaceous materials in Al2O3–C refractories on aluminum and carbon pick-up of iron

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Journal of Iron and Steel Research International 2020年第1期27卷 55-61页

作者： Yao-wu Wei yan-jun Dong tao Zhang Jun-feng Chen Wen yan The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina

Carbon-containing Al2O3 refractory crucibles and pure Al2O3 refractory crucible were fabricated to study the effect of carbon-containing Al2O3-C refractories on aluminum and carbon pick-up of *** crucibles with pure iron powder were placed in a vacuum induction furnace and heated at 1600℃ for regular time under flowing argon *** Al and C contents of iron samples were analyzed,and iron samples were also investigated using a field scanning electron microscope equipped with energy-dispersive *** results showed that carbon materials did affect the interac?tion of(Al2O3-C)/Fe system,carbothermal reduction in alumina occurred in the reaction system and the extent of reactions depended on the kinds of carbon materials.

关键词： Al2O3-C refractory Liquid iron Aluminum pick-up Carbon pick-up Carbothermal reduction

Pathways toward wearable and high-performance sensors based on hydrogels:toughening networks and conductive networks

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National Science Review 2023年第9期10卷 286-306页

作者： Junbo Zhu Jingchen tao Wei yan Weixing Song Beijing Key Laboratory for Optical Materials and Photonic Devices Department of Chemistry Capital Normal University

Wearable hydrogel sensors provide a user-friendly option for wearable electronics and align well with the existing manufacturing strategy for connecting and communicating with large numbers of Internet of Things *** is attributed to their components and structures,which exhibit exceptional adaptability,scalability,bio-compatibility,and self-healing properties,reminiscent of human *** review focuses on the recent research on principal structural elements of wearable hydrogels:toughening networks and conductive networks,highlighting the strategies for enhancing mechanical and electrical *** hydrogel sensors are categorized for an extensive exploration of their composition,mechanism,and design *** review provides a comprehensive understanding of wearable hydrogels and offers guidance for the design of components and structures in order to develop high-performance wearable hydrogel sensors.

关键词： hydrogels electronic skin toughening networks conductive networks wearable sensors

Resilient performance of self-centering hybrid rocking walls with curved interface under pseudo-static loading

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Earthquake Engineering and Engineering Vibration 2024年第1期23卷 65-85页

作者： Su Xing yan Shi Sun Xianglei Wang tao School of Civil Engineering Shenyang Jianzhu UniversityShenyang 110168China PetroChina East China Design Institute Co. Ltd.Qingdao 266000China Qingdao Country Garden Bolin Real Estate Co. Ltd.Qingdao 266100China

Frame and rocking wall(FRW)structures have excellent resilient performance during ***,the concrete at interfacial corners of rocking walls(RWs)is easily crushed due to local extreme compression during the rocking *** innovative RW with a curved interface is proposed to prevent interfacial corners from producing local damage,enhancing its earthquake resilient performance(ERP).The precast wall panel with a curved interface is assembled into an integral self-centering hybrid rocking wall(SCRW)by two post-tensioned unbonded prestressed ***,two ordinary energy dissipation steel rebars and two shear reinforcements are arranged to increase the energy dissipation capacity and lateral *** SCRW specimens and one monolithic reinforced concrete(RC)shear wall(SW)were tested under pseudo-static loading to compare the ERPs of the proposed SCRW and the SW,focusing on studying the effect of the curved interface on the *** key resilient performance of rocking effects,failure modes,and hysteretic properties of the SCRW were *** results show that nonlinear deformations of the SCRW are concentrated along the interface between the SCRW and the foundation,avoiding damage within the *** restoring force provided by the prestressed tendons can effectively realize self-centering capacity with small residual deformation,and the resilient performance of the SCRW is better than that of monolithic *** addition,the curved interface of the SCRW makes the rocking center change and move inward,partially relieving the stress concentration and crush of *** rocking range of the rocking center is about 41.4%of the width of the SCRW.

关键词： self-centering hybrid rocking wall(SCRW) monolithic shear wall(SW) earthquake resilient performance(ERP) curved interface rocking center

Triple-Helix Structured Model Based on Problem-Knowledge-Solution Co-evolution for Innovative Product Design Process

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Chinese Journal of Mechanical Engineering 2020年第6期33卷 49-63页

作者： Qian Hui yan Li Ye tao Hongwei Liu Innovation Method and Creative Design Key Laboratory of Sichuan Province Chengdu610065China School of Mechanical Engineering Sichuan UniversityChengdu610065China

A design problem with deficient information is generally described as wicked or *** information insufficiency leaves designers with loose settings,free environments,and a lack of strict boundaries,which provides them with more opportunities to facilitate ***,to capture the opportunity behind the uncertainty of a design problem,this study models an innovative design as a composite solving process,where the problem is clarified and resolved from fuzziness to satisfying solutions by interplay among design problems,knowledge,and ***,a triple-helix structured model for the innovative product design process is proposed based on the co-evolution of the problem,solution,and knowledge spaces,to provide designers with a distinct design strategy and method for innovative *** three spaces interact and co-evolve through iterative mappings,including problem structuring,knowledge expansion,and solution *** mappings carry the information processing and decision-making activities of the design,and create the path to satisfying ***,a case study of a reactor coolant flow distribution device is presented to demonstrate the practicability of this model and the method for innovative product design.

关键词： Innovative design Problem-knowledge-solution co-evolution Design activity Design process Product design

A New Flatness Pattern Recognition Model Based on Cerebellar Model Articulation Controllers Network

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Journal of Iron and Steel Research International 2008年第5期15卷 32-36页

作者： HE Hai-tao LI yan College of Information Science and Engineering Yanshan University Qinhuangdao 066004 Hebei China

In the traditional flatness pattern recognition neural network, the topologic configurations need to be rebuilt with a changing width of cold strip. Furthermore, the large learning assignment, slow convergence, and local minimum in the network are observed. Moreover, going by the structure of the traditional neural network, according to experience, the model is time-consuming and complex. Thus, a new approach of flatness pattern recognition is proposed based on the CMAC （cerebellar model articulation controllers） neural network. The difference in fuzzy distances between samples and the basic patterns is introduced as the input of the CMAC network. Simultaneously, the adequate learning rate is improved in the error correction algorithm of this neural network. The new approach with advantages, such as high learning speed, good generalization, and easy implementation, is efficient and intelligent. The simulation results show that the speed and accuracy of the flatness pattern recognition model are obviously im proved.

关键词： flatness pattern recognition CMAC neural network fuzzy distance

Behavioral Feature and Correlative Detection of Multiple Types of Node in the Internet of Vehicles

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Computers, Materials & Continua 2020年第8期64卷 1127-1137页

作者： Pengshou Xie Guoqiang Ma tao Feng yan yan Xueming Han School of Computer and Communications Lanzhou University of TechnologyLanzhou730050China Department of Computing Faculty of Science and EngineeringMacquarie UniversitySydneyNSW 2109Australia

Undoubtedly,uncooperative or malicious nodes threaten the safety of Internet of Vehicles(IoV)by destroying routing or *** this end,some researchers have designed some node detection mechanisms and trust calculating algorithms based on some different feature parameters of IoV such as communication,data,energy,etc.,to detect and evaluate vehicle ***,it is difficult to effectively assess the trust level of a vehicle node only by message forwarding,data consistency,and energy *** order to resolve these problems,a novel mechanism and a new trust calculating model is proposed in this ***,the four tuple method is adopted,to qualitatively describing various types of nodes of IoV;Second,analyzing the behavioral features and correlation of various nodes based on route forwarding rate,data forwarding rate and physical location;third,designing double layer detection feature parameters with the ability to detect uncooperative nodes and malicious nodes;fourth,establishing a node correlative detection model with a double layer structure by combining the network layer and the perception ***,we conducted simulation experiments to verify the accuracy and time of this detection method under different speed-rate topological conditions of *** results show that comparing with methods which only considers energy or communication parameters,the method proposed in this paper has obvious advantages in the detection of uncooperative and malicious nodes of IoV;especially,with the double detection feature parameters and node correlative detection model combined,detection accuracy is effectively improved,and the calculation time of node detection is largely reduced.

关键词： IoV behavioral feature double layer detection feature correlation analysis correlative detection model

Adsorption of arsenate on lanthanum-impregnated activated alumina:In situ ATR-FTIR and two-dimensional correlation analysis study

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Chinese Chemical Letters 2015年第2期26卷 200-204页

作者： Qian-tao Shi Wei yan State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of Sciences

Lanthanum modified materials have been widely used for the removal of hazardous *** this study,in situ ATR-FTIR and two-dimensional correlation analysis were employed to investigate the adsorption mechanism of arsenate（As（V）） on lanthanum-impregnated activated alumina（LAA）.Our results showed that electrostatic interaction attracted As（V） anions to the LAA surface,and then As（V） could form monodentate configuration on the LAA surface at pH *** result of 2D-COS showed that two coexistent adsorbed As（V） species,H2AsO4^- and HAsO4^2-,were adsorbed on the LAA surface without specific sequence at different pH conditions,indicating a negligible role of the incorporated protons of As（V） on the adsorption affinity to LAA *** results of this study reveal insights into LAA surface complexes on the molecular scale and provide theoretical support to new metal oxides design for efficient arsenic removal.

关键词： Arsenic Adsorption Lanthanum-impregnated activated alumina Two-dimensional(2D) correlation