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Deformation behavior and microstructural evolution during hot compression of an a+b Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy

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International Journal of Minerals,Metallurgy and Materials 2011年第3期18卷 344-351页

作者： Gao-feng Liu Shang-zhou Zhang Li-qing Chen Jian-xun qiu School of Environmental and Materials Engineering Yantai University Yantai 264005 China State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 China

The effect of processing parameters on the flow response and microstructural evolution of the a＋b titanium alloy Ti-6.5Al-3.5Mo-1.5Zr-0.3Si has been studied by conducting isothermal hot compressive tests at a strain rate of 0.01-10 s-1 at 860-1100°C. The true stress-true strain curves of the sample hot-compressed in the a＋b phase region exhibit a peak stress followed by continuous flow softening, whereas in the b region, the flow stress attains a steady-state regime. At a strain rate of 10 s-1, the alloy exhibits plastic flow insta-bilities. According to the kinetic rate equation, the apparent activation energies are estimated to be about 674-705 kJ/mol in the a＋b region and 308-335 kJ/mol in the b region, respectively. When deformed in the a＋b region, the globularization process of the a colony structure occurs, and a dynamic recrystallized microstructures are observed to show bimodal. Dynamic recrystallization can take place in the b region irrespective of starting deformed structures.

关键词： titanium alloys hot pressing deformation microstructural evolution activation energy

Preparation and Electrochemical Properties of xLi2MnO3·（1-x）LiMn2O4 Composites

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Chemical Research in Chinese Universities 2013年第2期29卷 307-310页

作者： YAO Su-mei ZHANG Jing-wen GUO xun qiu Xin-ping Key Laboratory of Organic Optoelectronics and Molecular Engineering Department of Chemistry Tsinghua University Beo'ing 100084 P. R. China

Li2MnO3-doped spinel LiMn2O4 composites were synthesized by sol-gel method to improve the electro- chemical performance of LiMn2O4. The microstructures, morphologies and electrochemical performance of the obtained xLi2MnO3.（1-x）LiMnEO4 composites were characterized by X-ray diffraction（XRD）, scan electron microsco- py（SEM） and a galvanostatic charge-discharge process. It was found that both Li2MnO3 and LiMn2O4 components exist in xLi2MnO3·（1-x）LiMn204（O〈x〈1） composites. The 0.3Li2MnO3·0.7LiMnEO4 composite shows the optimized electrochemical performance, including discharge capacity and cycle stability. It was demonstrated that LiEMnO3-doped spinel LiMn204 cathode material can work at wide potential window with quite good capacity reten- tion and considerably larger reversible capacity compared to single-phase LiMn204 component.

关键词： Spinel Composite Electrochemical performance

Corrosion behavior of pure metals(Ni and Ti)and alloys(316H SS and GH3535)in liquid GaInSn

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Nuclear Science and Techniques 2024年第3期35卷 70-83页

作者： Jian-Hui Yu Hong-Xia Xu Xiang-Xi Ye Bin Leng Han-xun qiu Xing-Tai Zhou School of Materials and Chemistry University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China

In this study,the interactions between a Ga-based liquid metal,GaInSn,and several metal materials,including pure metals(Ni and Ti)and alloys(316H stainless steel(SS)and GH3535),at 650℃were *** aim was to evaluate the corrosion performance and select a suitable candidate material for use as a molten salt manometer diaphragm in thermal energy storage *** results indicated that the alloys(316H SS and GH3535)exhibited less corrosion than pure metals(Ni and Ti)in liquid ***-rich binary intermetallic compounds were found to form on the surfaces of all the tested metal materials exposed to liquid GaInSn,as a result of the decomposition of liquid GaInSn and its reaction with the constituent elements of the metal *** corrosion mechanism for all the tested materials exposed to liquid GaInSn was also investigated and proposed,which may aid in selecting the optimal candidate material when liquid GaInSn is used as the pressure-sensing medium.

关键词： Metal materials Liquid GaInSn Corrosion Intermetallic compounds Thermal energy storage systems

Nodeless superconducting gaps in Ca10(Pt(4-δ)As8)((Fe(1-x)Ptx)2As2)5 probed by quasiparticle heat transport

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Science China(Physics,Mechanics & Astronomy) 2016年第5期59卷 16-20页

作者： xun qiu LanPo He XiaoChen Hong ZhenZhang Jian Pan XiaoPing Shen DongLai Feng ShiYan Li State Key Laboratory of Surface Physics Department of Physics and Laboratory of Advanced Materials Fudan University Shanghai 200433 China Shanghai Institute of Space Power Source Shanghai 200245 China Collaborative Innovation Center of Advanced Microstructures Fudan University Shanghai 200433 China

The in-plane thermal conductivity of the iron-based superconductor Ca10（Pt4δAs8）（（Fe1-xPtx）2As2）5 single crystal （＂10-4-8＂, Tc = 22 K） was measured down to 80 inK. In a zero field, the residual linear term ro/T is negligible, suggesting the nodeless superconducting gaps in this multiband compound. In the magnetic fields, r0/T increases rapidly, which mimics the multiband superconductor NbSe2 and LuNi2B2C with highly anisotropic gap. Such a field dependence of K0/T is an evidence for the multiple superconducting gaps with quite different magnitudes or highly anisotropic gap. Compared with the London penetration depth results of the Ca10（Pt3As8）（（Fe1-xPtx）zAs2）5 （＂10-3-8＂） compound, the 10-4-8 and 10-3-8 compounds may have a similar superconducting gap structure.

关键词： iron-based superconductors thermal conductivity superconducting gap structure

Effect of Electric Potentials on Microstructure, Corrosion and Wear Characteristic of the Nitrided Layer Prepared on 2Cr13 Stainless Steel by Plasma Nitriding

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Acta Metallurgica Sinica(English Letters) 2019年第6期32卷 733-745页

作者： Yang Li Shang-Zhou Zhang Jian-xun qiu Yong-Yong He Jun-Jie Xiu Qian-Wen Ye Zhong-Li Liu School of nuclear equipment and nuclear engineering Yantai University.Yantai 264005China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

Plasma nitriding is a widely used technology to enhance the surface performance and extend the service life of alloy *** current research mainly focuses on the influences of time,temperature,gas type and pressure parameters on nitriding behavior,while fewer studies have been conducted on the electric *** paper mainly reports the effect of the electric potential on nitriding *** conditions were set using cathodic,anodic and floating potentials in a plasma nitriding furnace.2Cr13 stainless steel was nitrided at 450°C for 5h in an NH3 *** experimental results show that the nitriding treatment can be well performed under the different electric potentials,but differences exist in microstructures,morphologies and performance results of the modified *** thickness and hardness values of the nitrided layer are ranked as follows:cathodic[anodic[floating *** anodic nitrided surface has an obvious particle deposition layer composed of nitrides and *** and tribological experiments show that the corrosion resistance and wear resistance were significantly improved after a nitriding treatment using the three electric ***,the floating nitriding treatment resulted in the best tribological performance and corrosion resistance.

关键词： Nitriding Stainless steel Wear Corrosion

Aspirin in hepatocellular carcinoma:Is it an out-of-date or promising treatment?

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iLIVER 2022年第1期1卷 55-64页

作者： xun qiu Fengqiang Gao Kai Wang Zhensheng Zhang Chuxiao Shao Xiao Xu Key Laboratory of Integrated Oncology and Intelligent Medicine of Zhejiang Province Department of Hepatobiliary and Pancreatic SurgeryAffiliated Hangzhou First People's HospitalZhejiang University School of MedicineHangzhou310006China Westlake Laboratory of Life Sciences and Biomedicine Hangzhou310024China NHC Key Laboratory of Combined Multi-organ Transplantation Hangzhou310003China Institute of Organ Transplantation Zhejiang UniversityHangzhou310003China Department of Hepatobiliary and Pancreatic Surgery Affiliated Lishui HospitalZhejiang University School of MedicineLishui323000China

Hepatocellular carcinoma(HCC)is one of the most aggressive human malignancies with a dismal survival *** strategies can effectively prevent the occurrence of *** immunotherapy has significantly improved HCC-related survival in recent years,this systemic therapy is very expensive and lays a heavy burden on most HCC ***,which is currently one of the most widely used medications in analgesic and cardiovascular diseases,is reported to have anti-tumor effects on *** importantly,long-term administration of low-dose aspirin does not significantly increase the risk of gastrointestinal *** to its costeffectiveness and wide use,aspirin can be easily applied as an HCC treatment and is affordable for a wide range of ***,deeper understanding and more attention are needed to extend the frontline of aspirin's preventive and therapeutic potential into cancer research and *** this review,we discuss the preventive effect of aspirin on HCC in the context of different etiological factors,including hepatitis B or hepatitis C virus infection,non-alcoholic fatty liver disease,and alcohol-associated liver *** therapeutic role of aspirin in resectable or unresectable HCC management is also ***,the mechanisms underlying the anti-cancer effects of aspirin on HCC are fully reviewed and discussed in the following two aspects:the effect of aspirin on multi-oncogenic signaling pathways in HCC(e.g.,AMPK,Wnt/β-catenin,NF-κB)and aspirinmediated immunometabolic responses in liver *** findings indicate aspirin is a promising agent for populations at risk and HCC patients to prevent or treat HCC.

关键词： Hepatocellular carcinoma Aspirin Chemoprevention Cancer therapy Oncogenic signaling Immunometabolic response

Role of the portal system in liver regeneration:From molecular mechanisms to clinical management

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Liver Research 2024年第1期8卷 1-10页

作者： Hanzhi Xu xun qiu Zhoucheng Wang Kai Wang Yawen Tan Fengqiang Gao Marcos Vinicius Perini Xiao Xu Zhejiang University School of Medicine HangzhouZhejiangChina Key Laboratory of Integrated Oncology and Intelligent Medicine of Zhejiang Province HangzhouZhejiangChina Department of Surgery University of MelbourneAustin HealthHeidelbergVictoriaAustralia

The liver has a strong regenerative capacity that ensures patient recovery after hepatectomy and liver *** portal system plays a crucial role in the dual blood supply to the liver,making it a significant factor in hepatic *** surgical strategies,such as portal vein ligation,associating liver partition and portal vein ligation for staged hepatectomy,and dual vein embolization,have high-lighted the portal system's importance in liver *** hepatectomy or liver trans-plantation,the hemodynamic properties of the portal system change dramatically,triggering regeneration via shear stress and the induction of ***,excessive portal hyperperfusion can harm the liver and negatively affect patient ***,as the importance of the gut-liver axis has gradually been revealed,the effect of metabolites and cytokines from gut microbes carried by portal blood on liver regeneration has been *** these perspectives,this review outlines the molecular mechanisms of the portal system's role in liver regeneration and summarizes therapeutic strategies based on the portal system intervention to promote liver regeneration.

关键词： Portal system Liver regeneration Hemodynamic properties Gut microbiota Therapeutic strategies

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红松仁脂肪的近红外光谱定量检测

江苏农业学报 2018年第3期34卷 692-698页

作者：仇逊超哈尔滨金融学院计算机系黑龙江哈尔滨150030

为实现红松仁脂肪无损、简便检测,利用近红外光谱分析技术对红松仁脂肪进行定量分析,用偏最小二乘法构建去壳红松仁脂肪定量分析模型,采用多种预处理方法优化模型,并且利用间隔偏最小二乘法、反向间隔偏最小二乘法、无信息变量消除法进... 详细信息

为实现红松仁脂肪无损、简便检测,利用近红外光谱分析技术对红松仁脂肪进行定量分析,用偏最小二乘法构建去壳红松仁脂肪定量分析模型,采用多种预处理方法优化模型,并且利用间隔偏最小二乘法、反向间隔偏最小二乘法、无信息变量消除法进行特征波段的筛选。结果表明,红松仁光谱经一阶导数预处理后建立的模型最佳;波段优选可以提升模型质量,其中反向间隔偏最小二乘法的筛选结果最佳,其松仁脂肪模型校正集相关系数为0.911 4,验证集相关系数为0.882 0,验证集均方根误差为0.646 8。可见,经过优化后,模型的预测性能较好,实现了去壳红松仁脂肪的快速、无损检测。

关键词：近红外光谱红松仁脂肪定量检测

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国家可持续竞争力研究——以美国为典型例证

财经问题研究 2001年第6期 20-24页

作者：邱询旻东北财经大学博士后流动站辽宁大连116025

在信息网络时代 ,一个国家如何提升和保持其竞争力是各国政府普通关注的问题 ,也是经济学家不断探索的重大课题。针对当前国际上关于国际竞争力研究存在的问题和不足 ,我提出了“可持续竞争力”的新范畴 ,并以美国经济发展的持续性特点... 详细信息

在信息网络时代 ,一个国家如何提升和保持其竞争力是各国政府普通关注的问题 ,也是经济学家不断探索的重大课题。针对当前国际上关于国际竞争力研究存在的问题和不足 ,我提出了“可持续竞争力”的新范畴 ,并以美国经济发展的持续性特点为例证进行比较研究 ,得出下述结述 :可持续竞争力是实现一国经济超常发展的根本道路 ;创新是实现可持续竞争力的最重要渠道 ;合理的制度安排和创新制度是实现可持续竞争力的根本保证 ;可持续竞争力的基础是制衡的竞争 ;

关键词：美国经济可持续竞争力制度创新制衡