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Effect of Hydrogen on Plastic Deformation near Crack-tipof A537 Steel in 3.5%NaCl Solution

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journal of Materials Science & Technology 1996年第3期12卷 227-231页

作者： Wei, Xj li, j Wang, ZF Ke, W State Key Lab. of Corrosion and Protection Institute of Corrosion and Protection of Metals Chinese Academy of Sciences Shenyang 110015 China

A computerized digital speckle-interferometry system was set up to study in-situ the influence of cathodic hydrogen charging on the crack opening displacement and on the plastic strain distribution at corrosion fatigue crack tip for the single-edge notched plate specimens of structural steel in 3.5%NaCl solution with an applied potential of -1400 mV (SCE). Meanwhile, the mono-directional tension tests with smooth specimens were performed in both air and 3.5%NaCl solution under the hydrogen charging conditions. The fracture surface morphology from corrosion fatigue and tension was examined by SEM. The experimental results show that the existence of hydrogen in crack tip material caused an increase of both yield strength and hardening exponent and a decrease of plastic zone size at the corrosion fatigue crack tip.

关键词： PROPAGATION METALS IRON

临床-超声列线图预测急性缺血性脑卒中短期预后

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中国介入影像与治疗学 2024年第6期21卷 338-342页

作者：苏航周志刚李菁郑州大学第一附属医院超声科河南郑州450052 郑州大学第一附属医院放射科河南郑州450052 郑州大学第一附属医院神经介入科河南郑州450052

目的观察临床-超声列线图预测急性缺血性脑卒中(AIS)短期预后的价值。方法回顾性分析168例接受血管内介入治疗的AIS患者,根据治疗后3个月改良Rankin量表评分将其分为预后良好组(n=134)及预后不良组(n=34)。比较组间临床及超声资料,采用... 详细信息

目的观察临床-超声列线图预测急性缺血性脑卒中(AIS)短期预后的价值。方法回顾性分析168例接受血管内介入治疗的AIS患者,根据治疗后3个月改良Rankin量表评分将其分为预后良好组(n=134)及预后不良组(n=34)。比较组间临床及超声资料,采用最小绝对收缩和选择算子(LASSO)算法及Cox回归方程分析AIS短期预后的独立影响因素,以之分别构建临床、超声及临床-超声列线图模型;绘制受试者工作特征曲线,计算曲线下面积(AUC),评估各模型预测AIS短期预后的效能。结果发病至入院时间、美国国立卫生院卒中量表(NIHSS)评分、Alberta卒中项目早期CT评分(ASPECTS)、斑块时间-强度曲线强度均值(TIC-M)及峰值强度(TIC-P)和伽马拟合曲线的AUC均为AIS短期预后的独立影响因素(P均<0.05)。临床、超声及临床-超声列线图模型预测AIS短期预后的AUC分别为0.888、0.758及0.921,以临床-超声列线图模型的预测效能最高(P均<0.05)。结论临床-超声列线图可有效预测AIS短期预后。

关键词：脑卒中超声检查预后

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ESR Study on the Photooxidation Mechanism of Near-Infrared Absorbing Benzothiazolone Cyanine Dye

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Chinese Chemical Letters 1997年第8期8卷 711-714页

作者： li, j Chen, P Zhao, j Zheng, DS Okasaki, T Hayami, M ACAD SINICA INST PHOTOG CHEMBEIJING 100101PEOPLES R CHINA NIPPON KANKAH SHIKISO KENKYUSHO OKAYAMA 701JAPAN

In this paper, the direct photooxidation mechanism of near-infrared absorbing benzothiazolone cyanine dye has been studied by VIS absorption spectroscopy and Electron Spin Resonance (ESR). The technique of spin trapping has been successfully applied to the detection of the photoinduced formation of singlet oxygen (O-1(2)) and superoxide (O-2(-)). It was reveled that the singlet oxygen and superoxide anion all contributed to the photofading of cyanine dye.

关键词： OPTICAL-DATA STORAGE MEDIA GENERATION

Diagnostic value of amino acid consumption test on exocrine pancreatic insufficiency

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World journal of Gastroenterology 2000年第2期6卷 290-292页

作者： Lei ZM li DY li j Wang Q He K Zheng SL Gan YG Luzhou Med Coll Affiliated Hosp Dept Hepatobiliary Surg Luzhou 646000 Sichuan Peoples R China

INTRODUCTIONAmino acid consumption test (AACT) has a highsensitivity and specificity in evaluating exocrinepancreatic insufficiency,but its diagnostic valueto exocrine pancreatic insufficiency in Chinese hasnot been well understood.In this study,the oralreagent stimulating pancreatic secretion (O-AACT)was used instead of cerulein(I-AACT) for amidoacid consumption test and the dignostic efficiency ofO-AACT was evaluated and compared with I-AACTon the exocrine pancreatic insufficiency in Chinese.

关键词： pancreatic insufficiency/diagnosis aminoacid consumption test cerulein cholelithiasis

PROPERTIES OF THREE-DIMENSIONAL MOVEMENT OF SANDY WATER DISCHARGED INTO A LAKE

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journal of Hydrodynamics 2001年第2期13卷 72-76页

作者： Deng, Y. li, j. li, K.F. Zhao, W.Q. State Key Lab. of High Speed Flow Sichuan Univ. Chengdu 610065 China

A Random Trajectory Model (RTM) for solid-liquid two-phase flow based on the Lagrangian Method is presented in this paper. The effects of water drag force, pressure gradient force, buoyancy and virtual mass force on the particles were included and the turbulent dispersion was modeled by random method. Three-dimensional k-Ε model was used to calculate the flow field. A pumped-storage power station, with a natural lake as its upper pool, was taken as a case for the study. Averaged movement trajectories, velocities and the volume-concentration distributions for 5 groups of sediment particles, were predicted with RTM. The possible silted locations in the lake were also predicted.

关键词： Boundary conditions Computer simulation Lakes Sand Three dimensional Two phase flow Velocity

由超拍电子伏特加速器产生的超高能伽马射线气泡

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Science Bulletin 2024年第4期69卷 449-457页

作者： LHAASO Collaboration Zhen Cao Chuandong Gao Cong li Ruo-Yu liu Ruizhi Yang 不详 Key Laboratory of Particle Astrophyics&Experimental Physics Division&Computing Center Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China TIANFU Cosmic Ray Research Center ChengduChina Institute of Frontier and Interdisciplinary Science Shandong UniversityQingdao 266237China School of Astronomy and Space Science Nanjing UniversityNanjing 210023China University of Science and Technology of China Hefei 230026China

We report the detection of aγ-ray bubble spanning at least 100deg2 in ultra-high energy(UHE)up to a few PeV in the direction of the star-forming region Cygnus X,implying the presence super PeVatron(s)accelerating protons to at least 10 PeV.A log-parabola form with the photon indexΓ(E)=(2.71±0.02)+(0.11±0.02)×log10(E/10 TeV)is found fitting the gamma-ray energy spectrum of the bubble well.UHE sources,“hot spots”correlated with very massive molecular clouds,and a quasi-spherical amorphousγ-ray emitter with a sharp central brightening are observed in the bubble.In the core of~0.5°,spatially associating with a region containing massive OB association(Cygnus OB2)and a microquasar(Cygnus X-3),as well as previously reported multi-TeV sources,an enhanced concentration of UHEγ-rays is observed with 2 photons at energies above 1 PeV.The general feature of the bubble,the morphology,and the energy spectrum,are reasonably reproduced by the assumption of a particle accelerator in the core,continuously injecting protons into the ambient medium.

关键词： Cosmic rays γ-rays Interstellar medium Star cluster

Synthesis and Catalyzing Behavior of Olefin Polymerization of cis-Cyclopentene Bridged Titanocenes

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Chinese Chemical Letters 2000年第11期11卷 979-980页

作者： li j.S. Xiong C.H. Ma Y.Q. li j. Chen X. Inst. of Elemento-Organic Chemistry Nankai University Tianjin 300071 China Department of Chemistry Tianjin Normal University Tianjin 300070 China

Two cis-cyclopentene bridged titanocenes have been synthesized. Two homogeneous Ziegler catalysts prepared by activation of synthesized compounds with methylalumoxane are active for ethylene polymerization reactions.

关键词： cis Ti Synthesis and Catalyzing Behavior of Olefin Polymerization of cis-Cyclopentene Bridged Titanocenes

Effects on the Surface Passive Film of Carbon Anode on Cell Behavior

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Chinese Chemical Letters 1997年第2期8卷 175-176页

作者： Ma, SH li, j jing, XB Wang, FS ACAD SINICA CHANGCHUN INST APPL CHEMPOLYMER PHYS LABCHANGCHUN 130022PEOPLES R CHINA

The properties of the films formed in the electrolyte of PC/DME liClO4 on two kinds of carbon materials were examined by cathodic polarization measurements. The result suggested that the films on both carbon electrode... 详细信息

关键词： DME Effects on the Surface Passive Film of Carbon Anode on Cell Behavior Cell

CARBON MATERIALS FOR liTHIUM ION BATTERIES

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Chinese Chemical Letters 1996年第4期7卷 389-390页

作者： Ma, SH li, j jing, XB Wang, FS ACAD SINICA CHANGCHUN INST APPL CHEMPOLYMER PHYS LABCHANGCHUN 130022PEOPLES R CHINA

ＣＡＲＢＯＮＭＡＴＥＲＩＡＬＳＦＯＲＬＩＴＨＩＵＭＩＯＮＢＡＴＴＥＲＩＥＳ￥ＳｈｕＨｕａＭＡ；ＪｉＬＩ；ＸｉａＢｉｎＪＩＮＧａｎｄＦｏＳｏｎｇＷＡＮＧ（ＰｏｌｙｍｅｒＰｈｙｓｉｃｓＬａｂｏｒａｔｏｒｙ，Ｃｈａｎｇｃｈ... 详细信息

ＣＡＲＢＯＮＭＡＴＥＲＩＡＬＳＦＯＲＬＩＴＨＩＵＭＩＯＮＢＡＴＴＥＲＩＥＳ￥ＳｈｕＨｕａＭＡ；ＪｉＬＩ；ＸｉａＢｉｎＪＩＮＧａｎｄＦｏＳｏｎｇＷＡＮＧ（ＰｏｌｙｍｅｒＰｈｙｓｉｃｓＬａｂｏｒａｔｏｒｙ，ＣｈａｎｇｃｈｕｎＩｎｓｔｉｔｕｔｅｏｆＡｐｐｌ...

关键词： ION CARBON MATERIALS FOR liTHIUM ION BATTERIES