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Flow characterization of macroporous W-4.8 vol.%ZrO2 alloy during hot deformation with improved constitutive equation and processing maps

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Tungsten 2024年第3期6卷 610-620页

作者： jia-Hao Ye Liu-jie Xu ji-Kang hu School of Materials Science and Engineering Henan University of Science and Technology National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials Henan University of Science and Technology

In this work,isothermal compression experiments of macroporous W-4.8 vol.%ZrO2（W-4.8ZrO2） at 1300-1600℃ and strain rate of 0.005-1 s-1were carried out on a Gleeble-1500D thermo-mechanical *** dynamic recovery of W-4.8ZrO2is the main "softening" *** the basis of Arrhenius model,the initial constitutive equation is established by exploring the influence of temperature,strain rate and rheological *** on Arrhenius model,the relationship between flow stress,strain rate and deformation temperature is *** the influence of strain,the improved constitutive equation and the law of material constant changing with the strain are *** that,the hot processing maps were drawn on the basis of the dynamic material model,which is used to analyze the instability mechanism of the W-4.8ZrO2,and determine the appropriate hot working process parameters(temperature:1350-1450℃,strain rate:0.1-1 s-1).

关键词： Tungsten alloy Flow characteristics Constitutive equation Hot processing maps

Effects of salt stress on rice growth, development characteristics, and the regulating ways： A review

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Journal of Integrative Agriculture 2017年第11期16卷 2357-2374页

作者： Sajid hussain ZHANG Jun-hua ZHONG Chu Zhu Lian-feng CAO Xiao-chuang YU Sheng-miao Allen Bohr James hu ji-jie jiN Qian-yu State Key Laboratory of Rice Biology China National Rice Research Institute Hangzhou 310006 P.R. China

Rice （Oryza safiva L.） is highly susceptible to the rhizosphere salinity than other cereals. High sensitivity has been ob- served, mainly at vegetative and reproductive stages in rice. It is the duty of plant physiologists to comprehend the growth, development, and physiological processes of rice plants under stress. This paper includes the overview of rice growth and developmental processes influenced by salt stress and the regulation pathways involved in these processes. It also includes the promising salt tolerance strategies, i.e., genetic modification techniques, agronomic practices to improve rice growth, yield; and role of phytohormones and their management, especially inhibition of ethylene biosynthesis by using inhibitors 1-methylcyclopropene （1-MCP）. Rice cultivation may be a first choice for improvement of salt tolerance through plant growth regulators and improved cultivation techniques. This study will significantly improve the understanding toward low rice grain yield and poor rice resistance under salt stress and will also stream scientific knowledge for effective utilization of salt affected soils by using different regulating ways.

关键词： rice salt stress ethylene 1-methylcyclopropene (1-MCP) physiology

Succinylation modification:a potential therapeutic target in stroke

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Neural Regeneration Research 2024年第4期19卷 781-787页

作者： jie Lian Wenwu Liu Qin hu Xiaohua Zhang Department of Neurosurgery Ren Ji HospitalShanghai Jiao Tong University School of Medicine Department of Diving and Hyperbaric Medicine Naval Medical CenterNaval Medical University

Stroke is a leading cause of mortality and disability *** cell death triggered by the compromised supply of blood oxygen and glucose is one of the major pathophysiology of strokeinduced brain *** mitochondrial energy metabolism is observed minutes after stroke and is closely associated with the progression of ***,a new type of posttranslational modification,known as lysine succinylation,has been recognized to play a significant role in mitochondrial energy metabolism after ***,the role of succinylation modification in cell metabolism after stroke and its regulation are not well *** aimed to review the effects of succinylation on energy metabolism,reactive oxygen species generation,and neuroinflammation,as well as Sirtuin 5 mediated desuccinylation after *** also highlight the potential of targeting succinylation/desuccinylation as a promising strategy for the treatment of *** succinylation level is dynamically regulated by the nonenzymatic or enzymatic transfer of a succinyl group to a protein on lysine residues and the removal of succinyl catalyzed by *** evidence has suggested that succinylation can regulate the metabolic pathway through modulating the activity or stability of metabolic ***,especially Sirtuin 5,are characterized for their desuccinylation activity and have been recognized as a critical regulator of metabolism through desuccinylating numerous metabolic *** between succinylation and desuccinylation has been implicated in the pathophysiology of *** agents that enhance the activity of Sirtuin 5 have been employed to promote desuccinylation and improve mitochondrial metabolism,and neuroprotective effects of these agents have been observed in experimental stroke ***,their therapeutic efficacy in stroke patients should be validated.

关键词： mitochondria metabolism neuroprotection sirtuin 5 stroke succinylation modification

Nanoindentation behavior and creep-induced cracking of long-term crept austenitic steel at 650℃

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Journal of Iron and Steel Research International 2024年第2期31卷 464-474页

作者： Zhen Zhang Yu-hang Duan Shuai Wang jin-shan Chen An-zhe Wang Xiang-yang Mao Yuan-ji Shi jie Zhang Ming Liu Zheng-fei hu School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing211167JiangsuChina jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing211167JiangsuChina jiangsu Wind Power Engineering Technology Center Nanjing210023JiangsuChina Nanjing Vocational University of Industry Technology Nanjing210023JiangsuChina Baoshan Iron&Steel Co. Ltd.Shanghai201900China Fujian Provincial Key Laboratory of Terahertz Functional Devices and Intelligent Sensing School of Mechanical Engineering and AutomationFuzhou UniversityFuzhou350116FujianChina School of Materials Science and Engineering Tongji UniversityShanghai201804China

The grain boundary(GB)damage of long-term crept HR3C(25Cr–20Ni–Nb–N)austenitic steel with solid solution state was investigated by nanoindentation test accompanied with in-situ electron back-scattered *** corresponding microstructure was characterized by scanning electron microscopy and transmission electron *** show that the increase in nanoindentation hardness at the GBs and triple grain junctions may be related to the dislocation accumulation and carbide growth during the *** M23C6 and dislocations piling-up at the GB accelerate the nucleation and coalescence of creep cavity along the *** nanoindentation hardness in grains varies with orientation of the stress *** orientation difference of neighbor grains may induce local high geometrically necessary dislocation densities and strain gradients near the GB,consequently causing stress concentration and subsequent crack growth at specific GBs.

关键词： Austenitic steel Creep Nanoindentation Grain orientation Creep-induced cracking

Oxidation behavior of Ni-based superalloy GH4738 under tensile stress

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Rare Metals 2024年第8期43卷 3913-3920页

作者： ji-Chong hu Hai-Liang huang Chong-Chong Wu Xiao-Yu Sun jie Wang Yan-Hong Yang jing-Long Qu Liang jiang jin-He Dou Yang Chen Institute for Advanced Studies in Precision Materials Yantai UniversityYantai 264005China Department of Management and Engineering Linkoping University58183LinkopingSweden Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Gaona Aero Material Co. LtdBeijing 100081China College of Artificial Intelligence and Big Data Shandong First Medical University and Shandong Academy of Medical SciencesJinan250117China

Revealing the oxidation behavior of superalloys is crucial for optimizing material properties and extending service *** study investigated the oxidation behavior of superalloy GH4738 under stress states at 850℃.High-throughput specimens were fabricated to withstand different stresses at the same *** oxidation s amples were analyzed using the mass gain method to obtain oxidation kinetic *** results show that the external stress below 200 MPa could improve the oxidation resistance of the *** tensile stress increasing,the oxide layer becomes thinner,denser and more complete,while internal oxidation *** tensile stress alters the structure of the external oxide layer from a two-layer to a threelayer *** Cr_(2)O_(3) oxide layer inhibits the outward diffusion of Ti,leading to Ti enrichment at the oxide-matrix interface and altering the oxidation mechanism of GH4738.

关键词： Ni-based Superalloy Oxidation behavior Tensile stress Oxide layer

SciCN:A Scientific Dataset for Chinese Named Entity Recognition

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Computers, Materials & Continua 2024年第3期78卷 4303-4315页

作者： jing Yang Bin ji Shasha Li Jun Ma jie Yu College of Computer National University of Defense TechnologyChangsha410073China

Named entity recognition(NER)is a fundamental task of information extraction(IE),and it has attracted considerable research attention in recent *** abundant annotated English NER datasets have significantly promoted the NER research in the English *** contrast,much fewer efforts are made to the Chinese NER research,especially in the scientific domain,due to the scarcity of Chinese NER *** alleviate this problem,we present aChinese scientificNER dataset–SciCN,which contains entity annotations of titles and abstracts derived from 3,500 scientific *** manually annotate a total of 62,059 entities,and these entities are classified into six *** to English scientific NER datasets,SciCN has a larger scale and is more diverse,for it not only contains more paper abstracts but these abstracts are derived from more research *** investigate the properties of SciCN and provide baselines for future research,we adapt a number of previous state-of-theart Chinese NER models to evaluate *** results show that SciCN is more challenging than other Chinese NER *** addition,previous studies have proven the effectiveness of using lexicons to enhance Chinese NER *** by this fact,we provide a scientific domain-specific *** results demonstrate that our lexicon delivers better performance gains than lexicons of other *** hope that the SciCN dataset and the lexicon will enable us to benchmark the NER task regarding the Chinese scientific domain and make progress for future *** dataset and lexicon are available at:https://***/yangjingla/***.

关键词： Named entity recognition dataset scientific information extraction lexicon

A 16-bit 18-MSPS flash-assisted SAR ADC with hybrid synchronous and asynchronous control logic

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Journal of Semiconductors 2024年第6期45卷 3-12页

作者： Junyao ji Xinao ji Ziyu Zhou Zhichao Dai Xuhui Chen jie Zhang Zheng jiang Hong Zhang School of Microelectronics Xi'an Jiaotong UniversityXi'an 710049China Qingdao Hi-image Tech.Co.Ltd. Qingdao 266100China

This paper presents a 16-bit,18-MSPS(million samples per second)flash-assisted successive-approximation-register(SAR)analog-to-digital converter(ADC)utilizing hybrid synchronous and asynchronous(HYSAS)timing control logic based on an on-chip delay-locked loop(DLL).The HYSAS scheme can provide a longer settling time for the capacitive digital-to-analog converter(CDAC)than the synchronous and asynchronous SAR ***,the issue of incomplete settling or ringing in the DAC voltage for cases of either on-chip or off-chip reference voltage can be solved to a large *** addition,the fore-ground calibration of the CDAC’s mismatch is performed with a finite-impulse-response bandpass filter(FIR-BPF)based least-mean-square(LMS)algorithm in an off-chip FPGA(field programmable gate array).Fabricated in 40-nm CMOS process,the proto-type ADC achieves 94.02-dB spurious-free dynamic range(SFDR),and 75.98-dB signal-to-noise-and-distortion ratio(SNDR)for a 2.88-MHz input under 18-MSPS sampling rate.

关键词： SAR ADC control logic reference ringing DAC incomplete settling

Water molecules regulation for reversible Zn anode in aqueous zinc ion battery:Mini-review

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Chinese Chemical Letters 2024年第8期35卷 50-61页

作者： jie Zhou Quanyu Li Xiaomeng hu Weifeng Wei Xiaobo ji Guichao Kuang Liangjun Zhou Libao Chen Yuejiao Chen State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

With the low cost,excellent safety and high theoretical specific capacity,aqueous zinc-ion batteries(AZ-IBs)are considered as a potential rival for lithium-ion batteries to promote the sustainable development of large-scale energy storage ***,the notorious Zn dendrites and low Coulombic effi-ciency(CE)limit further development of AZIBs,due to the unstable electrochemical deposition/stripping behavior of Zn anode in aqueous zinc ion *** this review,critical issues and advances are summarized in electrolyte engineering *** strategies are focused on active water molecules during electrochemical process,including high-concentration electrolytes,ionic liquids,gel-polymer elec-trolytes and functional *** suppressed active water molecules,the solvation and de-solvation behavior of Zn^(2+)can be regulated,thereby modulating the electrochemical performance of Zn ***,the inherent problems of these strategies are discussed,and some promising directions are pro-vided on electrolytes engineering for high performance Zn anode in AZIBs.

关键词： Electrolyte engineering Aqueous zinc ion battery Zinc metal anode Dendrite suppression Mildly acidic electrolyte

聚乳酸类缓释型支架材料的研究与应用意义(英文)

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中国临床康复 2005年第46期9卷 178-180页

作者：胡稷杰裴国献南方医科大学南方医院创伤骨科广东省广州市510515

目的:聚乳酸是具有良好的生物相容性和生物降解特性的聚合物,是美国食品和药品管理局(FDA)认可的一类可植入体内的生物材料。细胞因子在组织工程骨构建中的促进成骨、血管化等作用越来越受到广泛关注。但外源性细胞因子在体内半衰期较短... 详细信息

目的:聚乳酸是具有良好的生物相容性和生物降解特性的聚合物,是美国食品和药品管理局(FDA)认可的一类可植入体内的生物材料。细胞因子在组织工程骨构建中的促进成骨、血管化等作用越来越受到广泛关注。但外源性细胞因子在体内半衰期较短,不能在骨修复局部聚集和保持相对较高浓度。主要分析聚乳酸及其衍生化合物材料可作为多肽及蛋白质类药物的载体,通过其自身降解来调节药物释放,用于骨组织工程研究的研究现状与应用前景。资料来源:应用计算机检索Medline1993/2004文章,检索词为“polylac-ticacid,bonemorphogeneticprotein,vascularendothelialgrowthfactor,TGF-β”,限定语言English;检索中国期刊网1993/2004医药卫生类文章,限定语言种类中文。资料选择:纳入标准:①有关聚乳酸及其衍生物构建骨组织工程支架的研究。②聚乳酸类支架负载细胞因子研究。排除标准:①陈旧文献。②重复研究。资料提炼:共收集到96篇与聚乳酸组织工程支架相关文献,其中23篇纳入引用。资料综合:①聚乳酸/聚乳酸和聚羟基乙酸的共聚物是一种良好的可生物降解的控释骨架,且具有支架和缓释的双重作用。聚乳酸是最早作为骨、软骨组织工程的支架材料,也是目前运用最广泛的骨组织工程材。②骨形态发生蛋白是应用于骨组织工程最多的因子,负载、缓释骨形态发生蛋白的聚乳酸类支架研究最为深入,未见血管内皮生长因子负载于聚乳酸类支架材料研究。结论:对于可缓释多种因子的聚乳酸类支架材料的开发与应用已经成为骨组织工程支架新的热点。

关键词：迟效制剂聚合物/代谢聚羟基乙酸/代谢聚乳酸/代谢支架生物降解细胞因子类