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Prediction and evaluation of optimum quenching temperature and microstructure in a 1300 MPa ultra-high-strength Q&P steel

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Journal of Iron and Steel Research International 2022年第2期29卷 307-315页

作者： Peng-fei gao Ju-hua Liang Wei-jian Chen Feng Li Zheng-zhi Zhao Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation Beijing100083China Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefei230031AnhuiChina

The quenching and partitioning steel is the representative of the third generation of advanced high-strength *** effect of quenching temperature on the microstructure and mechanical property of ferrite-containing quenching and partitioning steel was studied by intercritical annealing quenching and partitioning *** preparing a test steel with a tensile strength of 1300 MPa and total elongation of 19%,it is found that the actual optimum quenching temperature was lower than that calculated according to the constrained carbon *** results indicate that the martensite start temperature of the austenite was overestimated when considering the diffusion of carbon *** grain size which is affected by low temperature and the existence of ferrite during intercritical annealing influenced the optimum quenching temperature.A scheme considering the diffusion of various alloying elements and austenite grain size was proposed and *** this scheme,the optimum quenching temperature of intercritically annealed quenching and partitioning steel with complex microstructures was well predicted.

关键词： Quenching and partitioning Constrained carbon equilibrium Retained austenite Martensite start temperature Plasticity Quenching temperature

A kinetic study and factor analysis of solar thermochemical membrane reactors for syngas production

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Science China Technological Sciences 2025年第1期 207-221页

作者： Jiaxin XING Chao XU Xiangyu SUN Xin XIA fei JIN Qiongqiong jianG Jiale gao Key Laboratory of Power Station Energy Transfer Conversion and System of MOE School of Energy Power and Mechanical EngineeringNorth China Electric Power University Department of Chemistry University College London School of Chemistry and Chemical Engineering Ningxia Key Laboratory of Solar Chemical Conversion TechnologyState Ethnic Affairs CommissionNorth Minzu University

Solar thermochemical conversion technologies are promising for effectively utilizing solar energy by capturing the full spectrum of solar radiation. To overcome the challenges of low energy conversion efficiency and intermittency faced by solar thermochemical conversion, these technologies can be effectively integrated with membrane reactor technology. Although the performance of solar thermochemical membrane reactors has been experimentally tested, the chemical reactions and oxygen transport mechanisms during the energy conversion process remain poorly understood. This study introduces a resistance network model to elucidate the interactions between interfacial reactions and bulk diffusion during simultaneous oxidationreduction reactions on both sides of the membrane. We analyzed the oxygen flux of the membrane reactor under various operating conditions using this model to identify the reaction/transport-limiting side of the overall process. The most effective solar membrane reactor configuration utilizes natural gas and CO2, facilitating clean conversion of fossil fuels with significant advantages in fuel production and energy efficiency. Introducing CH4lowers the overall reaction temperature, maintains low oxygen partial pressure on the sweep side, and produces a synthesis gas with a 2:1 H2/CO molar ratio. Finally, a sensitivity analysis was used to explore the relationship between overall fuel production performance and operational parameters,highlighting the critical role of this research in enhancing the reaction and transport performance of membrane reactors and advancing the development of solar-driven thermochemical fuel production technologies.

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MPI-RCDD: A Framework for MPI Runtime Communication Deadlock Detection

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Journal of Computer Science & Technology 2020年第2期35卷 395-411页

作者： Hong-Mei Wei jian gao Peng Qing Kang Yu Yan-fei Fang Ming-Lu Li Department of Computer Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China jiangnan Institute of Computing Technology Wuxi 214083China

The message passing interface (MPI) has become a de facto standard for programming models of highperformance computing, but its rich and flexible interface semantics makes the program easy to generate communication deadlock, which seriously affects the usability of the system. However, the existing detection tools for MPI communication deadlock are not scalable enough to adapt to the continuous expansion of system scale. In this context, we propose a framework for MPI runtime communication deadlock detection, namely MPI-RCDD, which contains three kinds of main mechanisms. Firstly, MPI-RCDD has a message logging protocol that is associated with deadlock detection to ensure that the communication messages required for deadlock analysis are not lost. Secondly, it uses the asynchronous processing thread provided by the MPI to implement the transfer of dependencies between processes, so that multiple processes can participate in deadlock detection simultaneously, thus alleviating the performance bottleneck problem of centralized analysis. In addition, it uses an AND⊕OR model based algorithm named AODA to perform deadlock analysis work. The AODA algorithm combines the advantages of both timeout-based and dependency-based deadlock analysis approaches, and allows the processes in the timeout state to search for a deadlock circle or knot in the process of dependency transfer. Further, the AODA algorithm cannot lead to false positives and can represent the source of the deadlock accurately. The experimental results on typical MPI communication deadlock benchmarks such as Umpire Test Suit demonstrate the capability of MPIRCDD. Additionally, the experiments on the NPB benchmarks obtain the satisfying performance cost, which show that the MPI-RCDD has strong scalability.

关键词： high-performance computing message passing interface(MPI) communication deadlock deadlock detection AND⊕OR model

An efficient and facile procedure for synthesis of octyl polyglucoside

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Chinese Chemical Letters 2007年第10期18卷 1173-1175页

作者： Ying Wu Jiu gao Yu Xiao fei Ma jian She Zhang Department of Chemistry School of Science Tianjin University Tianjin 300072 China

Nonionic surfactant alkyl polyglucoside （APG） was prepared by direct glycosidation of alkyl alcohol with glucose in the presence of sulfate acid-silica gel （H2SO4/SiO2） as solid acidic catalyst. The quantity of catalyst was only of 1 wt%, based on the glucose, and the conversion of glucose was close to 100% at 110 ℃ in 1.5 h. The product was characterized by FT-IR, mass and ^1H NMR spectra. The degree of polymerization （DP） of the glucose in the product was 1.37, and critical micelle concentration （CMC） of product was only 0.0104 wt%.

关键词： Alkyl polyglucoside Sulfate acid-silica gel Solid acidic Catalyst

Synthesis of aliphatic amidediol and used as a novel mixed plasticizer for thermoplastic starch

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Chinese Chemical Letters 2008年第4期19卷 395-398页

作者： jian She Zhang Jiu gao Yu Ying Wu Xiao fei Ma School of Science Tianjin UniversityTianjin 300072PR China

In this paper,aliphatic amidediol was synthesized and mixed with glycerol used as a plasticizer for preparing thermoplastic starch（AGPTPS）.The yield of aliphatic amidediol was 91%.FF-IR expressed that the mixture of aliphatic amidediol and glycerol formed stronger and stable hydrogen bond with starch molecules compared to the native *** scanning electron microscope（SEM）native cornstarch granules were proved to transfer to a homogeneous continuous *** being stored for a period time at room temperature,the mechanical properties of AGPTPS were also *** a mixed plasticizer,aliphatic amidediol and glycerol would be practical to extend TPS application scopes.

关键词： Thermoplastic starch Aliphatic amidediol Glycerol Plasticizer

Two New Eremophilenolides from Ligularia tongolensis

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Chinese Chemical Letters 2005年第8期16卷 1053-1055页

作者： Yi Feng HAN Dong Qing fei Kun gao Zhong jian JIA State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000

Chemical investigation of L. tongolensis afforded two new eremophilenolides, which were identified as 3β-（2＇-methylbutanoyloxy）-8βH-eremophil-7（11）-en-12, 8α（14, 6α）-diolide （1）and 8βH-eremophil-3, 7（11）-dien-12, 8α （14, 6α）-diolide （2）. Their structures were established by spectroscopic methods including 2D NMR experiments.

关键词： Ligularia tongolensis Compositae eremophilenolide sesquiterpene.

Comparison of LAMP,GeneXpert,Mycobacterial Culture,Smear Microscopy,***,TBAg/PHA Ratio for Diagnosis of Pulmonary Tuberculosis

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Current Medical Science 2021年第5期41卷 1023-1028页

作者： Yan DENG Yi-fei DUAN Shu-pei gao jian-miao WANG Department of Respiratory and Critical Care Medicine Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Department of Infection Control Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China

Objective:To investigate the application value of loop-mediated isothermal amplification(LAMP),GeneXpert,mycobacterial culture,smear microscopy,***(TSPOT),ratio of TB-specific antigen to phytohemagglutinin(TBAg/PHA ratio)in the detection of mycobacterium tuberculosis in the bronchoalveolar lavage ***:A retrospective analysis was performed on the patients who underwent bronchoscopy from December 2018 to November 2019 in Tongji *** patients with positive tuberculosis culture or positive GeneXpert in bronchoalveolar lavage fluid were selected as the case group,and those without tuberculosis served as the control *** receiver operating characteristic(ROC)curve was used to evaluate the diagnostic value of LAMP,GeneXpert,culture,smear microscopy,TSPOT,and TBAg/PHA ***:For the patients with positive cultures as case,the sensitivity of LAMP,GeneXpert,smear microscopy,TSPOT and TBAg/PHA ratio was 73.49%,89.16%,25.30%,80.00%,33.85%,respectively,the specificity was 99.00%,100.00%,99.00%,86.00%,100.00%,respectively,the area under the ROC curve(AUC)was 0.849,0.938,0.633,0.830,0.669,*** the patients with positive GeneXpert as case,the sensitivity of LAMP,mycobacterial culture,smear microscopy,TSPOT and TBAg/PHA ratio was 73.20%,74.23%,22.68%,68.92%,29.73%,respectively,the specificity was 99.00%,100.00%,99.00%,86.00%,100.00%,respectively,the AUC was 0.853,0.878,0.623,0.775,0.649,***:The sensitivity of GeneXpert was *** sensitivity and diagnostic value of LAMP were slightly lower than those of GeneXpert,and were similar to tuberculosis *** sensitivity of smear microscopy was *** specificity of TSPOT was *** TBAg/PHA ratio>0.2 was used as a diagnostic index,the specificity was improved,but the sensitivity was low.

关键词： pulmonary tuberculosis bronchoalveolar lavage fluid loop-mediated isothermal amplification GeneXpert TSPOT

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The Green

Acta Seismologica Sinica(English Edition) 2001年第2期14卷 196-202页

作者： LU jian-fei 1. jiangsu University of Science and Technology 212013 Zhenjiang Jiangsu China 2. Shanghai Jiaotong University 200030 Shanghai China

By using integral transform methods, the Green’s functions of horizontal harmonic force applied at the interior of the saturated half-space soil are obtained in the paper. The general solutions of the Biot dynamic equations in frequency domain are established through the use of Hankel integral transforms technique. Utilizing the above-mentioned general solutions, and the boundary conditions of the surface of the half-space and the continuous conditions at the plane of the horizontal force, the solutions of the boundary value problem can be determined. By the numerical inverse Hankel transforms method, the Green’s functions of the harmonic horizontal force are obtainable. The degenerate case of the results deduced from this paper agrees well with the known results. Two numerical examples are given in the paper.

关键词： Biot theory Hankel transforms Green’s function asymmetric P315.9

Spherical Orthotomic and Spherical Antiothotomic

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Acta Mathematica Sinica,English Series 2007年第9期23卷 1673-1682页

作者： jian fei XIONG Department of Mathematics Qingdao University Qingdao 266071 P. R. China

In this paper the spherical orthotomic and the spherical antiorthotomic are defined and their local diffeomorphic types are determined.

关键词： spherical curve spherical orthotomic spherical antiorthotomic singularity