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Deformation behaviors of as-built and hot isostatically pressed Ti-6Al-4V alloys fabricated via electron beam rapid manufacturing

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Journal of Materials Science & Technology 2019年第11期35卷 2552-2558页

作者： Z.liu Z.B.Zhao J.R.liu l.wang S.X.Zhu G.Yang S.l Gong Q.J.wang R.Yang institute of metal research chinese academy of sciencesshenyang110016china school of materials science and engineering university of science and technology of chinahefei230000china avic manufacturing technology institute beijing100024china

The deformation behavior of as-built and hot isostatically pressed(HIP)Ti-6Al-4V alloys fabricated using electron beam rapid manufacturing(EBRM)were investigated in this *** deformation characteristics were characterized using a laser scanning confocal microscope and electron back-scattered diffraction(EBSD).In the as-built sample,prismatic slip was the main mode of deformation,as well as a small amount of basal slip and *** planar slip lines with large length scales were observed across severalα*** hot isostatical pressing,prismatic and basal slip were the main mode of deformation,accompanied by abundant cross-slip and multiple slip,and most of the slip lines were blocked within an a *** differences in deformation behavior were associated with the coarsening of a laths and the more retained p phase after HIP compared to the as-built *** cross-slip and multiple slip can lead to superior elongation-to-failure and a greater strain hardening effect in the HIP alloy compared to the as-built sample.

关键词： Electron beam rapid manufacturing Ti-6Al-4V Hot isostatic pressure Mechanical properties Slip behavior

Tunable near- to mid-infrared pump terahertz probe spectroscopy in reflection geometry

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Frontiers of physics 2017年第5期12卷 81-85页

作者： S. J. Zhang Z. X. wang T. Dong N. l. wang International Center for Quantum Materials School of Physics Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China

Strong-field mid-infrared pump-terahertz （THz）probe spectroscopy has been proven as a powerful tool for light control of different orders in strongly correlated materials. We report the construction of an ultrafast broadband infrared pump-THz probe system in reflection geometry. A two-output optical parametric amplifier is used for generating mid-infrared pulses with GaSe as the nonlinear crystal. The setup is capable of pumping bulk materials at wavelengths ranging from 1.2 μm to 15 μm and beyond, and detecting the subtle, transient photoinduced changes in the reflected electric field of the THz probe at different temperatures. As a demonstration, we present 15 μm pump-THz probe measurements of a bulk EuSbTe3 single crystal. A 0.5% transient change in the reflected THz electric field can be clearly resolved. The widely tuned pumping energy could be used in mode-selective excitation experiments and applied to many strongly correlated electron systems.

关键词： mid-infrared pump terahertz spectroscopy

The role of a novel antibacterial substance,cyclic opine-producing lacticaseibacillus rhamnosus lS8 in ameliorating ulcerative colitis:a fecal microbiota transplantation study

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Food Science and Human Wellness 2024年第2期13卷 778-790页

作者： Tao wang Shuang wang Shuchen Dong Ruiling wang Shuxuan wang Jie Yang Xin wang Xin lü College of Food Science and Engineering Northwest Agriculture and Forestry UniversityYangling 712100China Faculty of Food Science and Engineering Kunming University of Science and TechnologyKunming 650500China School of life Science and Technology Xinjiang UniversityUrumqi 830046China

Intestinal microbiota imbalance may worsen the progression of ulcerative colitis(UC).lacticaseibacillus rhamnosus lS8(lR)has the potential ability to regulate microbiota through producing a novel antibacterial substance,cyclic opine:*** study aimed to investigate whether lR could ameliorate dextran sulfate sodium-induced UC in mice via modulating intestinal microbiota using fecal microbiota transplantation(FMT)*** results showed that both lR and FMT attenuated UC as evidenced by 1)alleviating disease activity index and colonic pathology;2)up-regulating MUCs and tight junction proteins;3)increasing oxidative mediators and decreasing antioxidant mediators;4)down-regulating proinflammatory cytokines and *** results were mainly attributable to the microbiota-regulating effect of lR,including increasing beneficial bacteria(like Akkermansia)and its related SCFAs,while decreasing harmful bacteria(like Proteobacteria)and its related lPS,thereby suppressing the hyperactivation of TlR4/NF-κB ***,lR can alleviate UC and is a potential dietary supplement to attenuate UC.

关键词： Gut barrier Gut microbiota Fecal microbiota transplantation lacticaseibacillus rhamnosus Oxidative stress Ulcerative colitis

Study on the dynamic mechanical properties of winding-block axial structure considering short circuit strain rate effect

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High Voltage 2024年第2期9卷 380-390页

作者： Xinyu wang Ping wang Jianghai Geng Zikang Zhang Fangcheng lü Shuguo Gao Hebei Provincial Key laboratory of Power Transmission Equipment Security Defense North China Electric Power UniversityBaodingChina State Grid Hebei Electric Power Research Institute ShijiazhuangChina

Transformers may suffer multiple short-circuit impacts during long-term operation,and axial instability is one of the typical types of serious accidents caused by short-circuit *** axial instability form of the winding-block structure is analysed,and the dynamic solution of the winding short-circuit electromagnetic force is obtained by estab-lishing the three-dimensional magnetic-circuit-force multi-physical field coupling simulation *** influence of strain rate on the cushion block constitutive equation is corrected,and the modified model is verified by short-circuit impact test and quasi-static *** research results show that for 110 kV 31.5 MVA transformers,the maximum electromagnetic axial resultant force of winding is 363.16 kN,and the ultimate tilt force is 1214.2 *** pre-tightening force configuration is accordingly recom-mended to range from 363.16 to 608.28 kN,which is narrowed by 18.49%compared with the static calculation method;Meanwhile,adding a logarithmic strain rate correction term to the classical constitutive equation of the cushion block can achieve a good correction of the stress-strain relationship with the coefficient of determination above 0.99,and the cushion block has a larger elastic modulus under high strain rate *** research results provide an important theoretical reference for the axial stability structure of transformers.

关键词： axial correction structure

IN　SITUlASER　RAMAN　SPECTROSCOPY　OF　THERMAl　DECOMPOSITION　OF　AMMONIUM　TUNGSTATE

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Chinese Chemical letters 1995年第12期6卷 1085-1086页

作者： li, XS Zhu, BZ wang, l Miao, YF Xin, Q Chinese Acad Sci Dalian Inst Chem Phys State Key Lab Catalysis Dalian 116023 Peoples R China Henan Coll Educ Dept Chem Zhengzhou 450003 Peoples R China

The mechanism of thermal decomposition of ammonium tungstate has been studied by to situ laser Raman spectroscopy (lRS) combined with thermal gravimetric analysis (TG), differental thermal analysis (DTA) and X-ray dif...

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基于FXR-FGF19通路研究益生菌对胆总管结石患者胆汁酸代谢的影响

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胃肠病学 2024年第1期29卷 10-14页

作者：叶绿望王丛范俊维蒋婷杜梦燕陈卫刚刘芳石河子大学医学院 832002 石河子大学第一附属医院消化内科

背景:胆总管结石在取石术后有较高的复发率。近年研究表明肠道微生态失衡与胆固醇结石的形成有关。目的:探究益生菌干预对胆固醇结石高危人群血清脂多糖(lPS)以及胆汁酸代谢指标的影响。方法:选取2021年6月—2023年6月在石河子大学第一... 详细信息

背景:胆总管结石在取石术后有较高的复发率。近年研究表明肠道微生态失衡与胆固醇结石的形成有关。目的:探究益生菌干预对胆固醇结石高危人群血清脂多糖(lPS)以及胆汁酸代谢指标的影响。方法:选取2021年6月—2023年6月在石河子大学第一附属医院行ERCP取石术的胆总管结石患者60例,收集胆汁和粪便样本行细菌培养。将患者随机分为对照组和益生菌干预组,对照组取石术后予常规支持治疗,干预组在常规治疗的基础上服用双歧杆菌三联活菌肠溶胶囊420 mg,每日2次,连续6个月。检测治疗前后革兰阴性菌细胞壁成分lPS、胆汁酸代谢关键分子成纤维细胞生长因子19(FGF19)和胆汁酸合成限速酶胆固醇7α-羟化酶(CYP7A1)血清水平的变化。结果:胆总管结石患者胆汁、粪便细菌培养显示主要致病菌为大肠埃希菌和肺炎克雷伯菌。ERCP取石术后6个月,患者血清lPS、FGF19水平明显降低,CYP7A1水平明显升高(P均lPS水平,同时调节胆汁酸经肠肝循环代谢的经典通路法尼酯X受体(FXR)-FGF19通路,从而减少胆汁中的胆固醇过饱和,降低胆固醇结石的形成概率。

关键词：益生菌脂多糖类胆总管结石胆汁酸代谢法尼酯X受体胆固醇7-α-羟化酶

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Optical spectroscopy study of charge density wave order in Sr3Rh4Sn13 and(Sr0.5Ca0.5)3Rh4Sn13

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Science China(Physics,Mechanics & Astronomy) 2017年第4期60卷 51-56页

作者： W.J.Ban H.E wang C.W.Tseng C.N.Kuo C.S.lue N.l.wang Institute of Physics Chinese Academy of SciencesBeijing 100190China Department of Physics Cheng Kung UniversityTainan 70101China International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China

We perform optical spectroscopy measurement on single-crystal samples of Sr3Rh4Sn13 and （Sr0.5Ca0.5）3Rh4Sn13. Formation of CDW energy gap was clearly observed for both single-crystal samples when they undergo the phase transitions. The existence of residual Drude components in σ1（ω） below Tcow indicates that the Fermi surface is only partially gapped in the CDW state. The obtained value of 2A/kBTcow is roughly 13 for both Sr3Rh4Sn13 and （Sr0.5Ca0.5）3Rh4Sn13 compounds, which is considerably larger than the mean-field value based on the weak-coupling BCS theory. The measurements provide optical evidence for the strong coupling characteristics of the CDW phase transition.

关键词： charge density wave optical spectroscopy intermetallic compounds

Variational data encoding and correlations in quantum-enhanced machine learning

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Chinese Physics B 2024年第9期33卷 298-306页

作者： Ming-Hao wang Hua l¨u School of Physics Hubei UniversityWuhan 430062China School of Science Hubei University of TechnologyWuhan 430068China

leveraging the extraordinary phenomena of quantum superposition and quantum correlation,quantum computing offers unprecedented potential for addressing challenges beyond the reach of classical *** paper tackles two pivotal challenges in the realm of quantum computing:firstly,the development of an effective encoding protocol for translating classical data into quantum states,a critical step for any quantum *** encoding strategies can significantly influence quantum computer ***,we address the need to counteract the inevitable noise that can hinder quantum *** primary contribution is the introduction of a novel variational data encoding method,grounded in quantum regression algorithm *** adapting the learning concept from machine learning,we render data encoding a learnable *** allowed us to study the role of quantum correlation in data *** numerical simulations of various regression tasks,we demonstrate the efficacy of our variational data encoding,particularly post-learning from instructional ***,we delve into the role of quantum correlation in enhancing task performance,especially in noisy *** findings underscore the critical role of quantum correlation in not only bolstering performance but also in mitigating noise interference,thus advancing the frontier of quantum computing.

关键词： quantum machine learning variational data encoding quantum correlation

Two-stage double peaks ageing and its effect on stress corrosion cracking susceptibility of Al-Zn-Mg alloy

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Journal of Materials Science & Technology 2018年第7期34卷 1250-1257页

作者： Y.l.wang H.C.Jiang Z.M.li D.S.Yan D.Zhang l.J.Rong CAS Key laboratory of Nuclear Materials and Safety Assessment Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China

Different artificial two-stage ageing behaviors and their effect on stress corrosion cracking （SCC） susceptibility of AI-Zn-Mg alloy have been investigated. The experimental results show that two hardness peaks present on the second-stage ageing-hardening curve when the first-stage ageing is dealt with comparatively lower temperature than the conventional one. The first peak is caused by dispersive and evenly distributed G.P. zones, while η ′phases and coarsened G.P. zones contribute to the second peak. Tensile strength of experimental alloy raises 9.6% （33.2 MPa） and SCC susceptibility decreases 38.9% by applying the second peak ageing regime instead of conventional T73. AI-Zn-Mg alloy obtains high strength and SCC resistance due to its finely dispersive matrix precipitates （MPts）, coarsened and discontinuous grain boundary precipitates （GBPs）, as well as the narrow precipitate free zone （PFZ） in the second peak ageing condition. 2017 Published by Elsevier ltd on behalf of The editorial office of Journal of Materials Science ＆ Technology.

关键词： Al-Zn-Mg alloy Two-stage ageing Double peaks ageing Stress corrosion cracking (SCC) susceptibility Grain boundary precipitates (GBPs)