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Deformation behavior and microstructure of an Al-Zn-Mg-Cu-Zr alloy during hot deformation

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International Journal of Minerals,Metallurgy and Materials 2010年第1期17卷 46-52页

作者： liang-ming Yan Jian Shen jun-peng li zhou-bing li Xiao-dong Yan General Research Institute for Nonferrous Metals Beijing 100088 China

The hot deformation behavior and microstructures of Al-7055 commercial alloy were investigated by axisymmetric hot compres- sion at temperatures ranging from 300℃ to 450℃ and strain rates from 10^-2 to 10 s^-1, respectively. Microstructures of deformed 7055 alloy were investigated by transmission electron microscopy （TEM）. The dependence of peak stress on deformation temperature and strain rate can be expressed by the hyperbolic-sine type equation. The hot deformation activation energy of the alloy is 146 kJ/mol. Moreover, the flow stress curves predicted by the modified constitutive equations are reasonably consistent with the experimental results, which confirms that the proposed deformation constitutive equations can provide evidence for the selection of hot forming parameters. TEM results indicate that dy- namic recovery is the main softening mechanism during hot deformation.

关键词： aluminum alloys dynamic recovery hot compression deformation behavior constitutive equation

Investigation on UV-curing Reprocessable Thermosets Bearing Hindered Urea Bonds and Their Composites with Modified Zinc Oxide Nanoparticles

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Chinese Journal of Polymer Science 2024年第6期42卷 751-765页

作者： jun-Hao zhou li-Ming Tang Key Laboratory of Advanced Materials of Ministry of Education of China Department of Chemical EngineeringTsinghua UniversityBeijing100084China

In this study,a series of hindered urea bond(HUB)containing polyurethane-urea methacrylate prepolymers and a none HUB containing polyurethane methacrylate prepolymer were prepared using isobornyl methacrylate as the reactive diluent via one-pot *** prepolymers were characterized fully by various ***,their thermosets were fabricated via UV curing in presence of a photo initiator,and their mechanical property and thermal behavior were investigated and *** from the none HUB containing thermoset,the HUB containing thermosets(defined as PUT)could be recycled and reprocessed by hot press under relatively mild conditions with high recovery ratio of mechanical ***,zinc oxide(ZnO)nanoparticles were modified with 3-(trimethoxysilyl)propyl methacrylate and the modified ZnO(defined as ZnO-TPM)was dispersed and polymerized into PUT matrix to prepare their *** influence of ZnO-TPM on the mechanical performance of the composites was evaluated,which indicated that the Young’s modulus and tensile strength increased gradually to the maximum values at ZnO-TPM content of 1 wt%and then *** composites also displayed good reprocessability with improved recovery ratio compared to the pure PUT *** addition,the composite materials exhibited strong UV absorption capacity,implying their potential application in the circumstance where UV-shielding was required.

关键词： Polyurethane-urea methacrylate Hindered urea bond ZnO nanoparticles Reprocessing UV curing

Diverse interactions of five core type Ⅲ effectors from Ralstonia solanacearum with plants

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Journal of Genetics and Genomics 2023年第5期50卷 341-352页

作者： Shen Cong jun-zhou li Zheng-Zhong Xiong Hai-Lei Wei Key Laboratory of Microbial Resources Collection and Preservation Ministry of Agriculture and Rural AffairsInstitute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijing 100081China

Ralstonia solanacearum is a widespread plant bacterial pathogen that can launch a range of type Ⅲ effectors(T3Es)to cause *** this study,we isolate a pathogenic *** strain named P380 from tomato *** out of 12 core T3Es of strain P380 are introduced into Pseudomonas syringae DC3000D36E separately to determine their functions in interacting with ***3000D36E that harbors each effector suppresses FliC-triggered Pti5 and ACRE31 expression,ROS burst,and callose ***,RipU,and RipW elicit cell death as well as upregulate the MAPK cascades in Nicotiana *** derivatives RipC1^(△DDXDX(T/V))and RipW^(△DDKXXQ)but not RipAE^(K310R) fail to suppress ROS ***,RipAE^(K310R) and RipW^(△DDKXXQ) retain the cell death elicitation *** and RipW are associated with salicylic acid and jasmonic acid pathways,*** and RipAQ significantly promote the propagation of DC3000D36E in *** five core T3Es localize in diverse subcellular organelles of nucleus,plasma membrane,endoplasmic reticulum,and Golgi *** suppressor of G2 allele of Skp1 is required for RipAE but not RipU-triggered cell death in *** results indicate that the core T3Es in *** play diverse roles in plantpathogen interactions.

关键词： Ralstonia solanacearum TypeⅢsecretion system Effectors PTI ETI

Pseudomonas Cyclic lipopeptide Medpeptin:Biosynthesis and Modulation of Plant Immunity

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Engineering 2023年第9期28卷 153-165页

作者： Yi-lin Gu jun-zhou li Yan li Shen Cong Jing Wang Yi-Nan Ma Hai-Lei Wei State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China Key Laboratory of Microbial Resources Collection and PreservationMinistry of Agriculture and Rural AffairsInstitute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijing 100081China Institute of Vegetables and Flowers Chinese Academy of Agricultural SciencesBeijing 100081China

The multifunctional secondary metabolites known as cyclic lipopeptides(CLPs),which are produced by a large variety of bacteria,have become a key category of plant immunity ***-CLPs(PsCLPs)are extremely diverse in structure and biological ***,an understanding of CLP-plant structure–function interactions currently remains ***,we identify medpeptin,a novel CLP from Pseudomonas mediterranea that consists of 22 amino *** is synthesized by a non-ribosomal peptide synthase(NRPS)gene cluster and regulated by a quorum-sensing *** research indicates that medpeptin does not exhibit antimicrobial activity;instead,it induces plant cell death immunity and confers resistance to bacterial *** transcriptome analysis and virus-induced gene silencing(VIGS)reveal a set of immune signaling candidates involved in medpeptin *** of a cell-wall leucine-rich repeat extensin protein(NbLRX3)or a receptor-like protein kinase(NbRLK25)—but not BAK1 or SGT1—compromises medpeptin-triggered cell death and resistance to pathogen infection in Nicotiana *** findings point to a noncanonical mechanism of CLP sensing and suggest perspectives for the development of plant disease resistance.

关键词： Pseudomonas Cyclic lipopeptide Cell death Leucine-rich repeat extension(LRX) Medpeptin Receptor-like kinase(RLK)

Syntheses,Characterizations and Crystal Structures of (E)-2-Methyl-1,3-diphenylisothiouronium Iodide and 1,3-Dibenzyl-2-methylisothiouronium Iodide

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Chinese Journal of Structural Chemistry 2015年第5期34卷 695-702页

作者： XIONG Xin-Xing li Di zhou jun-li XU Bao-Ming HUANG Qin WANG Long-Sheng Institute of POM-based Materials School of Chemistry and Chemical EngineeringHubei University of Technology

Two thiouronium iodide salts,（E）-2-methyl-1,3-diphenylisothiouronium iodide（1） and 1,3-dibenzyl-2-methylisothiouronium iodide（2）,were synthesized and characterized by single-crystal X-ray diffraction,1H NMR,IR,UV-vis and luminescence ***-crystal X-ray diffraction reveals that compound 1 crystallizes in monoclinic system,P21/n space group with a = 11.273（2）,b = 10.318（2）,c = 12.962（3） A,β = 99.03（3）°,V = 1489.0（5） A^3 and Z = 4;compound 2 crystallizes in monoclinic system,C2/c space group with a = 11.706（2）,b = 14.119（3）,c = 20.930（4） A,β = 103.84（3）°,V = 3358.8（12） A^3 and Z = *** thiouroniums of both compounds are Y-shaped planar structures to form a cross-conjugated *** averaged bond lengths of C-N and C-S indicate the presence of ＂Y＂ *** researches on UV-vis and luminescence spectra of compounds 1 and 2 indicate that they can form inclusion complex with β-CD in the aqueous solution.

关键词： organosulfur thiouronium "Y" aromaticity hydrogen bond β-CD

Engineering phonon thermal transport in few-layer PdSe_(2)

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Frontiers of physics 2024年第3期19卷 135-141页

作者： Meilin li Huanhuan Sun jun zhou Yunshan Zhao Phonon Engineering Research Center of Jiangsu Province Center for Quantum Transport and Thermal Energy ScienceInstitute of Physics Frontiers and Interdisciplinary SciencesSchool of Physics and TechnologyNanjing Normal UniversityNanjing 210023China

Engineering phonon transport in low-dimensional materials has great significance not only for fundamental research,but also for thermal management applications of electric ***,due to the difficulties of micro and nano processing and characterization techniques,the work on tuning phonon transport at nanoscale are *** this work,by introducing Ar+plasma,we probed the phonon transport in two-dimensional(2D)layered semiconductor PdSe_(2)under different defect *** using thermal bridge method,the thermal conductivity was measured to decrease by 50%after a certain Ar+irradiation,which implied a possible phase ***,Raman characterizations were performed to show that the Raman sensitive peaks of PdSe_(2)was red-shifted and finally became disappeared with the increase of defect concentration.“Defect engineering”proves be a practical strategy in tuning the phonon thermal transport in low-dimensional materials,thus providing guidance for potential application in designing thermoelectric devices with various emerging materials.

关键词： phonon transport PdSe_(2) defects thermal bridge method

Design,synthesis and antifungal activities in vitro of novel tetralin compounds

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Chinese Chemical Letters 2008年第3期19卷 264-268页

作者： Hui Tang You jun zhou Yao Wu li Jia Guo Lv Can Hui Zheng jun Chen Ju Zhu Department of Medicinal Chemistry School of Pharmacy Second Military Medical University Shanghai 200433 China

Novel chiral tetralin compounds were designed and synthesized, and their antifungal activities in vitro were tested. The results showed that all of target compounds had potent antifungal activities, and were stronger than that of control compounds tetrahydroisoquinolines. The binding model of lead molecules in the active site of CYP51 of Candida albicans showed that lead compound specifically interacted with the amino acids residues in the active site, without binding with the heme of CYP51, which was different from azole antifungal drugs. The present study might afford a novel lead molecule to develop non-azole CYP51 inhihitars of fungi.

关键词： Antifungal Chiral tetralins Lanosterol 14α-demethylase Design Synthesis

Progress in the generation of spinal cord organoids over the past decade and future perspectives

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Neural Regeneration Research 2024年第5期19卷 1013-1019页

作者： Gang zhou Siyuan Pang Yongning li jun Gao Department of Neurosurgery Peking Union Medical College HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijingChina Department of International Medical Service Peking Union Medical College HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijingChina

Spinal cord organoids are three-dimensional tissues derived from stem cells that recapitulate the primary morphological and functional characteristics of the spinal cord in *** emerging bioengineering methods have led to the optimization of cell culture protocols,spinal cord organoids technology has made remarkable advancements in the past *** literature search found that current spinal cord organoids do not only dynamically simulate neural tube formation but also exhibit diverse cytoarchitecture along the dorsal-ventral and rostral-caudal ***,fused organoids that integrate motor neurons and other regionally specific organoids exhibit intricate neural circuits that allows for functional *** qualities make spinal cord organoids valuable tools for disease modeling,drug screening,and tissue *** utilizing this emergent technology,researchers have made significant progress in investigating the pathogenesis and potential therapeutic targets of spinal cord ***,at present,spinal cord organoid technology remains in its infancy and has not been widely applied in translational *** of the next generation of spinal cord organoids will depend on good manufacturing practice standards and needs to focus on diverse cell phenotypes and electrophysiological functionality evaluation.

关键词： development organoid-on-a-chip pluripotent stem cells progress spinal cord diseases spinal cord organoids vascularization

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住宅厨房的通风优化模拟

武汉理工大学学报 2024年第7期46卷 91-97页

作者：张露黄军心周亮周军莉康鑫彭杨东桂树强彭建斌武汉理工大学土木工程与建筑学院武汉430070 中冶武勘工程技术有限公司武汉430080

基于实际住宅厨房和烹饪过程,建立物理模型并进行厨房环境CFD模拟,模拟结果与实测结果吻合很好。提出基于专用空调设备、双排风口油烟机和空气幕的厨房环境优化策略,对优化前后环境进行数值模拟对比分析。结果表明:优化后夏季备菜阶段... 详细信息

基于实际住宅厨房和烹饪过程,建立物理模型并进行厨房环境CFD模拟,模拟结果与实测结果吻合很好。提出基于专用空调设备、双排风口油烟机和空气幕的厨房环境优化策略,对优化前后环境进行数值模拟对比分析。结果表明:优化后夏季备菜阶段的平均温度下降15.7%,烹饪阶段平均温度下降20%,人体周围CO_(2)平均浓度接近380 ppm,人体呼吸区域油烟平均浓度接近0 ppm;优化后冬季备菜阶段的平均温度上升了65.4%,烹饪阶段平均温度上升了136%,人体呼吸区CO_(2)平均浓度不到500 ppm,人体呼吸区域油烟平均浓度接近0 ppm。

关键词：住宅厨房热舒适空气幕室内空气质量 CFD