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Microstructure and corrosion behavior of Mg-Sn-Ca alloys after extrusion

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中国有色金属学会会刊：英文版 2009年第1期19卷 40-44页

作者： T. ABU LEIL N. HORT W. DIETZEL C. BLAW ERT y. HUANG K. U. KAINER K. P. RAO GKSS Forschungszentrum Geesthacht GmbH Max-Planck Strasse 1 Geesthacht 21502 Germany City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong

Mg-Sn-Ca alloys promise a reasonable corrosion resistance in combination with good creep resistance, likely due to the presence of Ca2-xMgxSn and other phases. The selected alloys with 3% Sn and Ca in the range of 1%-2% have been extruded in order to achieve more homogeneous microstructure compared with the as-cast alloys. Optical microscopy(OM) and X-ray diffraction(XRD) techniques were used to study the microstructure and phases of these alloys. The corrosion behavior of these alloys was investigated by means of salt spray test and potentio-dynamic measurements. The results obtained on the alloys Mg-3Sn (T3), Mg-3Sn-1Ca (TX31), and Mg-3Sn-2Ca (TX32) indicate the presence of the same phases in as-cast and after extrusion, namely Mg2Sn, Ca2-xMgxSn, and Ca2-xMgxSn/Mg2Ca, respectively. However, due to the occurrence of extensive recrystallization in the extrusion process, the grain size has significantly reduced after extrusion. The reduction leads to the improvement of the corrosion resistance after extrusion which is then comparable with the commercial alloy AZ91D.

关键词： Mg-Sn-Ca合金腐蚀镁合金金属腐蚀

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生物医学工程与肌腱、韧带的修复和再生

生命科学 2009年第2期21卷 198-200页

作者： WOO Savio L-y 美国匹兹堡大学Swanson工程学院生物工程系

肌腱韧带的损伤修复是临床医学实践中的热点和难点,其近几年的进展很大一部分应归功于生物医学工程与临床实践结合。本文主要介绍了当前生物医学工程领域对于韧带肌腱损伤研究的几大热点问题,并介绍了作者在膝关节前交叉韧带损伤的生物... 详细信息

肌腱韧带的损伤修复是临床医学实践中的热点和难点,其近几年的进展很大一部分应归功于生物医学工程与临床实践结合。本文主要介绍了当前生物医学工程领域对于韧带肌腱损伤研究的几大热点问题,并介绍了作者在膝关节前交叉韧带损伤的生物工程修复研究方面所取得的初步成果,后者对于临床实践具有重要意义。

关键词：生物医学工程肌腱韧带损伤前交叉韧带腱病

Development of a high-strength Mg alloy with superior ductility through a unique texture modification from equal channel angular pressing

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Journal of Magnesium and Alloys 2021年第3期9卷 1007-1018页

作者： L.B.Tong J.H.Chu W.T.Sun Z.H.Jiang D.N.Zou S.F.Liu S.Kamado M.y.Zheng School of Metallurgical Engineering Xi'an University of Architecture and TechnologyXi'an 710055China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Jilin UniversityChangchun 130025China Department of Mechanical Engineering Nagaoka University of TechnologyNagaoka 940-2188Japan

In the current study,a homogenous ultra-fine grained microstructure with average grain size of 1.0μm is achieved in the Mg-Zn-Ca-Mn alloy through the reduplicative equal channel angular pressing(ECAP)at 300℃,and the mechanical properties are remarkably improved,with room-temperature yield strength of 269.6 MPa and elongation of 22.7%.The twinning deformation results in a discontinuous recrystallization behavior in the initial stage of *** further deformation,the continuously dynamic recrystallization contributes to an obvious grain refinement *** activation of non-basal slip system leads to the formation of a unique basal texture,which is related to the elevated ECAP temperature and the decreased grain *** grain refinement and texture modification derived from ECAP process result in the increase of yield strength,while the cracked secondary phase particles are beneficial to the enhanced ductility,through reducing the stress concentration and hindering premature failure.

关键词： Mg alloy ECAP Microstructural evolution High strength Superior ductility

Dynamic of Scalar Bosons in Aharonov-Bohm Magnetic Field

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Journal of Applied Mathematics and Physics 2024年第1期12卷 268-276页

作者： Frédéric D. y. Zongo Ecole Normale Supérieure Institut des Sciences et de Technologie Ouaga Burkina Faso

We study the dynamic of scalar bosons in the presence of Aharonov-Bohm magnetic field. First, we give the differential equation that governs this dynamic. Secondly, we use variational techniques to show that the following Schrödinger-Newton equation: , where A is an Aharonov-Bohm magnetic potential, has a unique ground-state solution.

关键词： Scalar Boson Aharonov-Bohm Magnetic Field Schrödinger-Newton Equation Ground-State Solution

SOME LOWER PERMIAN OSTRACODS FROM WESTERN HUPEH

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古生物学报 1954年第2期 246-264页

作者： y.T.HOU Institute of Palaeontology,Academia Sinica

IntroductionThe material described in the present paper was collected from the LowerPermian Chihsia limestone by *** and *** in 1951 dur-ing their excursion in Western *** Chihsia limestone is underlain by theMaan Coal series containing Lepidodendron ituense and is succeeded by the Mao-kou limestone bearing Verbeekina *** most characteristic fossils collect-ed from the Chihsia limestone are:Hayasakaia elegantula yabe et Hayasaka,Fistulipora chinensis yoh,Stylidophyllum of intermidicum Huang,*** Huang,Corwenia *** *** Ostracods came

关键词： SOME LOWER PERMIAN OSTRACODS FROM WESTERN HUPEH length 古生物 node line view 化石 than

Tectonic and Seismotectonics Survey in Behbahan

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Open Journal of Geology 2016年第2期6卷 103-108页

作者： S. y. Zolfegharifar M. Bosak Department of Civil Engineering Yasooj Branch Islamic Azad University Yasooj Iran Department of Geotechnics & Transportation Faculty of Civil Engineering Universiti Teknologi Malaysia Johor Bahru Malaysia

Among the natural hazards, destructive earthquakes are the most common cause of casualties and financial losses and human deaths several times more in developing countries than developed countries. By increasing urbanization and construction process, construction activities and because Behbahan is a new city and is located near active faults, earthquake risk is increasing and will have disastrous results. Historical data also indicate destructive earthquakes in 1052 and 1085 with the magnitudes of 8.6 and 8.5 on the Richter scale which destroyed Arjan and killed many people. Due to frequent earthquakes in Behbahan as well as numerous small and large faults around it, the city has high seismic potential. So locating new developments and constructions should be more accurate.

关键词： Seismotectonics Zagros Fault Arjan Behbahan

广泛耐药革兰阴性菌感染的实验诊断、抗菌治疗及医院感染控制:中国专家共识

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中国感染与化疗杂志 2017年第1期17卷 82-92页

作者：王明贵 X.Guan L.He B.Hu J.Hu X.Huang G.Lai y.Li y.Liu y.Ni H.Qiu Z.Shao y.Shi M.Wang R.Wang D.Wu C.Xie y.Xu F.yang K.yu y.yu J.Zhang C.Zhuo 复旦大学附属华山医院抗生素研究所上海200040 Chinese XDR Consensus Working Group

广泛耐药革兰阴性杆菌(XDR-GNB),是指除1~2类抗菌药物(主要指多黏菌素和替加环素)外,几乎对所有类别抗菌药物均不敏感的革兰阴性杆菌。XDR-GNB常见于肠杆菌科细菌、鲍曼不动杆菌、铜绿假单胞菌和嗜麦芽窄食单胞菌等。近年来,中国XDR-GN... 详细信息

广泛耐药革兰阴性杆菌(XDR-GNB),是指除1~2类抗菌药物(主要指多黏菌素和替加环素)外,几乎对所有类别抗菌药物均不敏感的革兰阴性杆菌。XDR-GNB常见于肠杆菌科细菌、鲍曼不动杆菌、铜绿假单胞菌和嗜麦芽窄食单胞菌等。近年来,中国XDR-GNB的发生率呈不断上升趋势,由于缺乏有效的治疗药物,XDR-GNB感染成为公共卫生安全的一大威胁。我国有关感染的临床、微生物学及临床药理学专家们就XDR-GNB感染的实验室诊断、临床诊疗和医院感染控制等问题深入讨论,形成此共识。其中细菌药敏试验的抗菌药物品种及结果判定标准遵循美国临床和实验室标准化协会(CLSI)、欧洲抗菌药物敏感性试验委员会(EUCAST)或美国食品与药物监督管理局(FDA)的指南。研究提示长疗程使用广谱抗菌药物是引发XDR-GNB感染最重要的危险因素。根据现有的临床研究和实验室数据,共识提供治疗各种XDRGNB感染的联合用药推荐方案,其中常用的抗菌药物有替加环素、多黏菌素、碳青霉烯类、氨基糖苷类和磷霉素等。同时建议实行严格的感染控制措施,包括手卫生、接触隔离、主动筛查、环境消毒、去定植和抗菌药物应用管理等遏制XDRGNB感染的传播。

关键词：广泛耐药肠杆菌科细菌鲍曼不动杆菌铜绿假单胞菌嗜麦芽窄食单胞菌抗菌治疗

Numerical analysis of thermal process in the near field around vertical disposal of high-level radioactive waste

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Journal of Rock Mechanics and Geotechnical Engineering 2014年第1期6卷 55-60页

作者： H.G.Zhao H.Shao H.Kunz J.Wang R.Su y.M.Liu CNNC Key Laboratory on Geological Disposal of High-level Radioactive Waste Beijing Research Institute of Uranium Geology(BRIUG) Federal Institute for Geosciences and Natural Resources(BGR)

For deep geological disposal of high-level radioactive waste(HLW)in granite,the temperature on the HLW canisters is commonly designed to be lower *** criterion dictates the dimension of the *** on the concept of HLW disposal in vertical boreholes,thermal process in the nearfield(host rock and buffer)surrounding HLW canisters has been simulated by using different *** results are drawn as follows:(a)the initial heat power of HLW canisters is the most important and sensitive parameter for evolution of temperaturefield;(b)the thermal properties and variations of the host rock,the engineered buffer,and possible gaps between canister and buffer and host rock are the additional key factors governing the heat transformation;(c)the gaps width and thefilling by water or air determine the temperature offsets between them.

关键词： High-level radioactive waste(HLW) Vertical disposal Engineered barrier system(EBS) Thermal conductivity properties

Conn’s Syndrome Secondary to Adrenal Adenoma

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Open Journal of Clinical Diagnostics 2016年第4期6卷 47-51页

作者： Sahil N. Fulara Nasir y. Fulara Department of Medicine Jaslok Hospital and Medical Research Center Mumbai India

Primary hyperaldosteronism is not as uncommon as we thought, and by recent estimates the prevalance may be as high as 11% among hypertensives. We present a case of a 33 years old male patient came with a complaint of headache in occipital area & weakness in both lower limb since 4 weeks. The patient was a diagnosed case of hypertension and was already on tablet Atenolol (25 mg) once a day. At the time of admission, the patient was found to have a pulse of 96/min and blood pressure of 170/100 mm of Hg. Power was 3/5 for both right and left lower limbs. At the time of admission, serum potassium was 2.8. As a result, the patient was shifted to tablet Metroprolol and Amlodipine (50 + 5 mg) once a day. We also added tablet Cilnidipine (10 mg) and Telmisartan (80 mg) once a day and syrup Potklor thrice a day with water. The patient was sent for renal artery doppler, urine for metanephrines and vanillylmandelic acid, serum aldosterone, plasma aldosterone/plasma renin activity ratio (PAC/PRA ratio), urinary aldosterone, urinary cortisol and adrenocorticotrophic hormone level and computed tomography (CT) abdomen to rule out hyperaldostronism. Plasma aldosterone/plasma renin activity ratio, urinary aldosterone was high and CT abdomen revealed a solitary nodule in the left adrenal gland measuring 1.2 × 1.0 cm in maximum transverse diameter, which was suggestive of adrenal adenoma. Diagnosis of Conn’s syndrome secondary to adrenal adenoma was made. The patient was advised tablet Aldactone (25 mg) once a day and serum electrolytes were repeated which showed normalization with normal blood pressure.

关键词： Primary Hyperaldosteronism Hypokalemia Headache Adenoma Hypertension