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Static recrystallization behaviors and mechanisms of 7Mo super-austenitic stainless steel with undissolved sigma precipitates during double-stage hot deformation

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Journal of Iron and Steel Research International 2024年第2期31卷 475-487页

作者： Shi-guang Xu Jin-shan He Run-ze zhang Fu-cheng zhang Xi-{2. Wang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao066004HebeiChina Shandong Provincial Key Laboratory for High Strength Lightweight Metallic Materials Advanced Materials InstituteQilu University of Technology(Shandong Academy of Science)Jinan250353ShandongChina

Static recrystallization(SRX)behaviors and corresponding recrystallization mechanisms of 7Mo super-austenitic stainless steel were studied under different deformation *** order of influence of deformation parameters on static recrystallization behaviors,from high to low,is followed by temperature,first-stage strain and strain ***,the effect of holding time on static recrystallization behaviors is significantly controlled by *** addition,with the increase in temperature from 1000 to 12.0°C,the static recrystallization mechanism evolves from discontinuous static recrystallization and continuous static recrystallization(cSRX)to metadynamic recrystallization and cSRX,and finally to *** cSRX exists at all *** is because high stacking fault energy(56 mJ m−2.promotes the movement of dislocations,making the deformation mechanism of this steel is dominated by planar slip of *** undissolved sigma precipitates promote static recrystallization through particle-stimulated ***,small strain-induced precipitates at grain boundaries hinder the nucleation of conventional SRX and the growth of recrystallized grains,while the hindering effect decreases with the increase in temperature.

关键词： 7Mo super-austenitic stainless steel Double-stage hot deformation Conventional static recrystallization Metadynamic recrystallization Strain-induced precipitation

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西北太平洋中国沿海海面倾斜及其机理初探

海洋学报 2002年第5期24卷 19-25页

作者：张赤军中国科学院测量与地球物理研究所湖北武汉430077

海面倾斜与高程基准密切相关 ,它已经受到大地测量学界和海洋学界的重视 .进一步讨论了大地水准的测量精度 ,指出了大地 (几何 )水准与沿海验潮资料的不符是由于海面的倾斜 ;分析了海面倾斜的机理 ,其中包括海流、海水密度分布、气压、... 详细信息

海面倾斜与高程基准密切相关 ,它已经受到大地测量学界和海洋学界的重视 .进一步讨论了大地水准的测量精度 ,指出了大地 (几何 )水准与沿海验潮资料的不符是由于海面的倾斜 ;分析了海面倾斜的机理 ,其中包括海流、海水密度分布、气压、台风引起的破碎波等的作用 ;提出了用海水异常密度的三维分布计算大地水准面的扰动 ,实质上它反映了海面的倾斜 ,该量占大地水准测量结果的 73% 。

关键词：海面倾斜海流海水密度大地水准面大地测量气压台风破碎波

Enhanced thermal conductivity and mechanical properties of 2. C_(f)/SiC composites modified by in-situ grown carbon nanotubes

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Journal of Advanced Ceramics 2024年第1期13卷 19-33页

作者： Changhui Niu Qing zhang Laifei Cheng Fang Ye Litong zhang Min Huang {2. Yang Science and Technology on Thermostructure Composite Materials Laboratory Northwestern Polytechnical UniversityXi’an 710072China Civil Aviation Department Zhejiang Institute of CommunicationsHangzhou 311112China Zhejiang Provincial Key Laboratory for Cutting Tools Taizhou UniversityTaizhou 318000China

In this work,the effects of carbon nanotubes(CNTs)on the microstructure evolution,thermal conductivity,and mechanical properties of C_(f)/SiC composites during chemical vapor infiltration(CVI)densification were investigated in *** with composites without CNTs,the thermal conductivity,flexural strength,flexural modulus,fracture toughness,interfacial shear strength,and proportional limit stress of specimens with CNTs of 4.94 wt%were improved by 117%,2..8%,67.4%,10.3%,36.4%,and 71.1%,*** improvement was attributed to the role of CNTs in the division of inter-layer pores,which provided abundant vapor growth sites for the ceramic matrix and promoted densification of the whole *** addition,the high thermal conductivity network formed by the overlap of CNTs and the rivet strengthening effect of CNTs were beneficial for synergistic improvement of thermal conductivity and mechanical properties of the ***,this study has practical significance for the development of thermal protection composite components with enhanced thermal conductivity and mechanical characteristics.

关键词： ceramic−matrix composites carbon nanotubes microstructure thermal conductivity mechanical properties

A Survey on Blockchain-Based Federated Learning:Categorization,Application and Analysis

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Computer Modeling in Engineering & sciences 2024年第6期139卷 2451-2477页

作者： Yuming Tang Yitian zhang tao Niu Zhen Li Zijian zhang Huaping Chen Long zhang School of Cyberspace Science&Technology Beijing Institute of TechnologyBeijing100081China School of Computer Science&Technology Beijing Institute of TechnologyBeijing100081China Southeast institute of Information Technology Beijing Institute of TechnologyPutian351100China Qianxin Technology Group Co. Ltd.Beijing100044China

Federated Learning(FL),as an emergent paradigm in privacy-preserving machine learning,has garnered significant interest from scholars and engineers across both academic and industrial *** its innovative approach to model training across distributed networks,FL has its vulnerabilities;the centralized server-client architecture introduces risks of single-point ***,the integrity of the global model—a cornerstone of FL—is susceptible to compromise through poisoning attacks by malicious *** attacks and the potential for privacy leakage via inference starkly undermine FL’s foundational privacy and security *** these reasons,some participants unwilling use their private data to train a model,which is a bottleneck in the development and industrialization of federated *** technology,characterized by its decentralized ledger system,offers a compelling solution to these *** inherently prevents single-point failures and,through its incentive mechanisms,motivates participants to contribute computing ***,blockchain-based FL(BCFL)emerges as a natural progression to address FL’s *** study begins with concise introductions to federated learning and blockchain technologies,followed by a formal analysis of the specific problems that FL *** discusses the challenges of combining the two technologies and presents an overview of the latest cryptographic solutions that prevent privacy leakage during communication and incentives in *** addition,this research examines the use of BCFL in various fields,such as the Internet of Things and the Internet of ***,it assesses the effectiveness of these solutions.

关键词： Federated learning blockchain privacy-preserving

Comparison of energy structure and spectral properties of Ce:LaAlO_3 and Ce:Lu_2.SiO_4)O

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Science china(Technological sciences) 2009年第12期52卷 3678-3682页

作者： WANG XiaoDan 1 ,PAN tao 1 ,ZANG taoCheng 1 ,LI JianKang 1 ,ZHAO ZhiWei 2.,{2. LianHan 2.&XU Jun3 1Department of Applied Physics,University of Science and Technology of Suzhou,Suzhou 2.5009,china 2.hanghai {2. of Optics and Fine Mechanics,chinese academy of sciences,Shanghai 2.1800,china 3Shanghai {2. of Ceramics,chinese academy of sciences,Shanghai 2.1800,china 1. Department of Applied Physics University of Science and Technology of Suzhou Suzhou 215009 China 2. Shanghai institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China 3. Shanghai institute of Ceramics Chinese Academy of Sciences Shanghai 201800 China

Undoped LaAlO3 and 1 at.%Ce:LaAlO3 single crystals were grown by the Czochralski *** and fluorescence spectra were measured at room *** energy levels structure of Ce:LaAlO3 was *** this paper,two viewpoints were *** first one is:the energy levels structure of Ce:LaAlO3 is very similar to that of Ce:Lu2.SiO4)O which is a well-known *** the energy levels structure of Ce:LaAlO3 and Ce:Lu2.SiO4)O,the lowest 5d energy level of Ce 3+ is located below the bottom of the conduction band of host crystal and the other higher 5d energy levels of Ce 3+ are located above the bottom of the conduction band of host *** second one is:Ce:LaAlO3 single crystal may not be suitable for scintillation application;by comparing the energy levels structures of Ce:LaAlO3 and Ce:Lu2.SiO4)O,the large energy difference(1.13 eV)between the two lowest 5d energy levels of Ce 3+ in LaAlO3 is a crucial factor that causes the luminescence quenching.

关键词： Ce:LaAlO3 Ce:Lu2.SiO4)O energy-level absorption luminescence

A sponge-based iron-tannic-acid hydrogel interface evaporator designed for clean water production

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Science china(Technological sciences) 2024年第5期67卷 1579-1591页

作者： zhang ZeKun LI ChengLong tao HuaYu GE Bo zhang YongLe ZHAO LiMin LIU JunChang REN GuiNa zhang ZhaoZhu School of Materials Science and Engineering Liaocheng UniversityLiaocheng252059China School of Environmental and Material Engineering Yantai UniversityYantai264405China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China

Due to the rapid advancement of technologies,there has been a significant increase in the discharge of industrial wastewater,and freshwater is becoming a scarce ***,research on solar evaporators is mainly focused on the efficient production of clean water,with less emphasis on the removal of residual pollutants remaining in the original *** this study,problems,including the difficult recovery of catalyst powder and the difficult removal of floating organic matter are solved by co-depositing low-surface-tension zirconia particles and bismuth tungstate onto the floating *** and melamine sponges were combined to solve the problem that traditional hydrogels lack mechanical *** excellent water-repellent effect can be seen from the contact angle between the liquid globule and canvas/felt,which is greater than 155°.The steam generation rate of the assembled evaporation system is 1.78 kg m^(-2.h^(-1),and its purification efficiency for methyl orange and rhodamine B exceeds 99%.This study presents a novel strategy for treating wastewater contaminated with organic dyes,aiming to solve problems including environmental damage,water pollution,and water scarcity.

关键词： oil removal non-wetting interface

Silence of Synaptotagmin VII inhibits release of dense core vesicles in PC12.cells

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Science china(Life sciences) 2009年第12期52卷 1156-1163页

作者： LI JiangLi1, XIAO Yang1, ZHOU Wei1, WU ZhengXing1, zhang RongYing1· & XU tao1,2. 1 Key Laboratory of Molecular Biophysics of the Ministry of Education, {2. of Biophysics and Biochemistry, College of Life Science and Technology, Huazhong University of Science and Technology, {2. 430074, china 2.National Key Laboratory of Biomacromolecules, {2. of Biophysics, chinese academy of sciences, Beijing 100101, china. Key Laboratory of Molecular Biophysics of the Ministry of Education Institute of Biophysics and Biochemistry College of Life Science and Technology Huazhong University of Science and Technology Wuhan 430074 China National Key Laboratory of Biomacromolecules Institute of Biophysics Chinese Academy of Sciences Beijing 100101 China

Synaptotagmin VII (Syt VII), which has a higher Ca2. affinity and slower disassembly kinetics with lipid than Syt I and Syt IX, was regarded as being uninvolved in synaptic vesicle (SV) exocytosis but instead possibly as a calcium sensor for the slower kinetic phase of dense core vesicles (DCVs) release. By using high temporal resolution capacitance and amperometry measurements, it was demonstrated that the knockdown of endogenous Syt VII attenuated the fusion of DCV with the plasma membrane, reduced the amplitude of the exocytotic burst of the Ca2.-triggered DCV release without affecting the slope of the sustained component, and blocked the fusion pore expansion. This suggests that Syt VII is the Ca2. sensor of DCV fusion machinery and is an essential factor for the establishment and maintenance of the pool size of releasable DCVs in PC12.cells.

关键词： Synaptotagmin VII dense core vesicles exocytosis RNA-mediated interference (RNAi)

The Effects of Thickness and Location of PCMon the Building’s Passive Temperature-Control–A Numerical Study

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Energy Engineering 2024年第3期121卷 681-702页

作者： Zhengrong Shi JieRen tao zhang Yanming Shen College of Energy and Mechanical Engineering Shanghai University of Electric PowerShanghai201306China Research and Development Center Heatmate New Energy Technology Co.Ltd.Shanghai200090China Shanghai Non-Carbon Energy Conversion and Utilization institute Shanghai Jiao Tong UniversityShanghai200240China

Building energy consumption and building carbon emissions both account for more than 2.%of their total national values in *** employing phase change material(PCM)for passive temperature control shows a promising prospect in meeting the comfort demand and reducing energy consumption ***,there is a lack of more detailed research on the interaction between the location and thickness of PCM and indoor natural convection,as well as indoor temperature *** this study,the numerical model of a passive temperature-controlled building integrating the developed PCM module is established with the help of *** which,the actual weather condition of Beijing city is set as the boundary conditions and the indoor natural convection is simulated with the consideration of radiation *** effects of PCM’s thickness and location on the internal temperature field are analyzed and *** results show that the room could maintain within the human comfort temperature range with the longest ratio of 94.10%and the shortest ratio of 51.04%as integrating *** comparison,the value is only 2..70%without *** room’s maximum temperature fluctuation can also be improved;it could be lowered by 64.4%compared to the normal *** the quantity of PCM is sufficient,further increasing the PCM amount results in a temperature fluctuation reduction of less than 0.1°C and does not increase the comfort *** PCM on the wall induces an apparent variation in indoor temperature along the vertical ***,placing PCM on the roof can lead to a heat transfer rate difference of up to seven *** optimal placement of PCM depends on the difference between the environmental and phase change *** the difference is positive,placing PCM on the roof is more effective;conversely,the opposite *** to the results over the entire cycle,PCM application on vertical walls yields better *** significant diffe

关键词： Phase change materials passive temperature regulation numerical simulation temperature field

Paddy Soil Stability and Mechanical Properties as Affected by Long-Term Application of Chemical Fertilizer and Animal Manure in Subtropical china

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Pedosphere 2007年第5期17卷 568-579页

作者： LI Jiang-tao zhang Bin School of Geographic and Oceanographic sciences Nanjing University Nanjing 210093 （China） institute of Soil Science Chinese Academy of Sciences Nanjing 210008 （China）

Wet stability, penetration resistance （PR）, and tensile strength （TS） of paddy soils under a fertilization experiment for 2. years were determined to elucidate the function of soil organic matter in paddy soil stabilization. The treatments included no fertilization （CK）, normal chemical fertilization （NPK）, double the NPK application rates （2.PK）, and NPK mixed with organic manure （NPK＋OM）. Compared with CK, Fertilization increased soil organic carbon （SOC） and soil porosity. The results of soil aggregate fragmentation degree （SAFD） showed that fast wetting by water was the key fragmentation mechanism. Among the treatments, the NPK＋OM treatment had the largest size of water-stable aggregates and greatest normal mean weight diameter （NMWD）（P ≤ 0.05）, but the lowest PR and TS in both cultivated horizon （Ap） and plow pan. The CK and 2.PK treatments were measured with PR 〉 2.0 MPa and friability index 〈 0.2., respectively, in the Ap horizon, suggesting that the soils was mechanically unfavourable to root growth and tillage. In the plow pan, the fertilization treatments had greater TS and PR than in CK. TS and PR of the tested soil aggregates were negatively correlated to SOC content and soil porosity. This study suggested that chemical fertilization could cause deterioration of mechanical properties while application of organic manure could improve soil stability and mechanical properties.

关键词： soil aggregate stability chemical fertilization organic matter penetration resistance tensile strength