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hardness, Wear Resistance and Fracture Toughness of Cast hiduminium/Corundum Particulate Composites

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Journal of Materials Science & Technology 1996年第5期12卷 357-360页

作者： K.h.W.Seah(Dept. of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260)R.S.Kulkarni and S.C.Sharma (Dept. of Mechanical Engineering, R.V.College of Engineering, Mysore Road, Bangalore-560-059, Karnataka, Ind RV COLL ENGN DEPT ENGN MECHBANGALORE 560059KARNATAKAINDIA SJCE DEPT ENGN MECHMYSOREKARNATAKAINDIA

This paper reports some results obtained in an investigation to see how increasing the corundum dispersoid content from 0% to 7% in a matrix of as-cast and wrought hiduminium alloy affects the hardness. wear resistance and fracture toughness of the composite. The results show that as the corundum content is increased, the hardness and the wear resistance increase remarkably,whereas the fracture toughness drops significantly. It was found that Just a minute amount of corundum is sufficient to cause a fairly large change in these mechanical properties. The hardness of the material is also affected signifIcantly by the aging time. Moreover, if other factors are kept constant, hot extrusion improves both its hardness and its wear resistance. whereas the fracture toughness is decreased

关键词： Wear Resistance and Fracture Toughness of Cast hiduminium/Corundum Particulate Composites Book Cast hardness

Properties of Cast hiduminium/Corundum Particulate Composites

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Journal of Materials Science & Technology 1995年第3期11卷 171-175页

作者： K.h. W. Seah(Dept. of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 0511)R.S.Kulkari and S.C.Sharma (Dept. of Mechanical Engineering, R.V.College of Engineering, Mysore Road, Bangalore-560-059, Karnataka, Ind RV COLL ENGN DEPT ENGN MECHBANGALORE 560059KARNATAKAINDIA SJCE DEPT MECH ENGNMYSOREKARNATAKAINDIA

This paper reports some results obtained in an investigation to see how increasing the corundum dispersoid content from o% to 7% in a matrix of hiduminium alloy affects the tensile and compressive strengths, the hardness and the casting characteristics of the composite. The results show that as the corundum content is increased, ultimate tensile strength (UTS)- compressive strength and hardness increase remarkably, whereas fluidity of the molten composite during casting drops significantly. It was found that just a minute amount of corundum is sufficient to cause a fairly large change in the mechanical properties and the fluidity of the molten *** drop in castability is one of the reasons why adding corundum beyond 7 percent is not recommended. If other factors are kept constant, the fluidity is seen to slightly improve if the pouring temperature of the molten metal were increased from 670 to 710℃

关键词： Cast Properties of Cast hiduminium/Corundum Particulate Composites ASM

Accuracy of three-dimensional quantification of left ventricular function using magnetic sensor acquisition: a dynamic in vitro model

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Chinese Medical Journal 2001年第10期114卷 3-6,101页

作者：徐金峰吴瑛李小葵 Ghada Elsedfy 李军 Jongsoo Lee Grispin h Davies David J Sahn 深圳市人民医院超声诊断科深圳518020 Clinical Care Center for Congenital heart Disease Oregon health Sciences University

Objective To evaluate the accuracy of a three-dimensional (3D) magnetic position sensor system in the quantification of ventricular stroke volumes in a dynamic *** A latex balloon model of the left ventricle was suspended in a water bath connected to a pump producing 10 different pulsatile stroke volumes (15-65mi/beat). Scanning was performed using a 5.0 mhz transducer mounted with a Flock of Birds (FOB) magnetic receiver (GE System Five). The probe was scanned to sweep continuously across and over the balloon volume over 3 - 7 seconds. Digital loops were stored on magneto-optical disks and reviewed retrospectively using 3D Echopac software (GE)based on Simpson's method and compared with a two-dimensional (2D) biplane area-length method (1/2L x R) measurements at end systole and end diastole. Both 3D and 2D derived stroke volumes were compared with the reference stroke volume calculated by direct measurement of balloon *** There was an improved correlation between 3D stroke volume and reference stroke volume ( y = 0.91 x + 0.41, r = 0.97, see = 2.83 ml, P = 0.0001 ) compared to 2D stroke volume and reference stroke volume (y=0.49x+8.68, r=0.87, see=3.87 ml, P=0.0011, difference between 2D and 3D P＜0.003).Conclusion 3D magnetic FOB scanning is practical, accurate and should facilitate assessment of left ventricular function.

关键词： three dimensional echocardiography · left ventricular function · magnetic sensor

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不列颠及其意识形态十字军对阵法国大革命

四川大学学报（哲学社会科学版） 2015年第1期 35-45页

作者：哈里.狄金森辛旭英国爱丁堡大学历史与古典学学院四川大学历史文化学院

1789年法国大革命对英国的政治实践及理念具有深远的影响。尽管一些激进的英国作家们深刻同情法国大革命,并期望大革命的政纲能在英国传播,但绝大多数知识人则投入到规模巨大的舆论战中,意在说服英国民众相信法国革命的信念对英国宪法... 详细信息

1789年法国大革命对英国的政治实践及理念具有深远的影响。尽管一些激进的英国作家们深刻同情法国大革命,并期望大革命的政纲能在英国传播,但绝大多数知识人则投入到规模巨大的舆论战中,意在说服英国民众相信法国革命的信念对英国宪法、政治传统、社会体制、宗教、公共秩序乃至个人财产都是威胁应予以拒斥。他们认为,法国大革命的政治信念是对秩序与稳定的威胁,它会摧毁贵族与君主制,也会威胁私有财产,并由此导致混乱、暴力与恐怖活动。1793到1802年英法开战,英国保守派政治宣传家们力劝对英国政治、社会、经济产生影响的人们认同他们对法国大革命信念的反对立场,从而支持他们在法国恢复旧秩序的战争诉求。本文即探讨并追溯由保守派宣传家们发动的、以其最知名者埃德蒙·伯克领导的这场颇具才干及影响力的政治争论。

关键词：法国大革命法国战争爱德蒙·伯克政治宣传出版物社会秩序

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有氧运动的历史——历经50年,仍在前进中

体育科研 2018年第6期39卷 19-23,64页

作者： Kenneth h.Cooper 朱为模库珀有氧中心美国伊利偌伊大学

《有氧运动》出版至今已有50年,追溯过去,我从未想过医生对于运动在医学实践中价值的态度会发生翻天覆地的变化。在我的一生中,我从未想到能见证平板测试成为完整检查的必要组成部分,没想到缺乏身体活动的重要性影响可与高血压和高胆固... 详细信息

《有氧运动》出版至今已有50年,追溯过去,我从未想过医生对于运动在医学实践中价值的态度会发生翻天覆地的变化。在我的一生中,我从未想到能见证平板测试成为完整检查的必要组成部分,没想到缺乏身体活动的重要性影响可与高血压和高胆固醇齐平,也没想到吸烟会被认为是影响冠状动脉的危险因素。本文介绍了在我和本领域许多同事的工作以及库珀研究中心(The Cooper Institute)的重要工作的影响下,这种缓慢但渐进的转变是如何发生的。1970年6月,我租用了一个研究所,也就是后来的库珀诊所(Cooper Clinic),半年之后,我在那里见到了我的第一个病人,现在库珀中心纵向研究作为世界上最大的比较测量健康水平的数据库,我们不再需要依赖问卷调查和从发表的700多篇学术文献中找寻健身与健康的关联,我们已经证明并且可以有把握地说,"运动是良医",更具体地说,我希望本文能够展示我们和其他人在这项科学研究中所做的工作,此外,即使是最严厉的批评者现在也在说,"这些结果令人印象深刻,不容忽视。"

关键词：运动是良医体适能健康青少年

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论正当反恐法律机制的创建

山东大学学报（哲学社会科学版） 2015年第5期 80-89页

作者：魏华张兰兰山东大学法学院

在确立反恐立场、制定反恐法律、采取反恐行动的过程中,保障国家安全与保障公民权利自由之间的平衡关系,是衡量反恐正当性的标尺。在二者的关系中,将任何一方推向极端的做法都是不可取的,因为国家安全与公民权利自由虽然在行动取向上有... 详细信息

在确立反恐立场、制定反恐法律、采取反恐行动的过程中,保障国家安全与保障公民权利自由之间的平衡关系,是衡量反恐正当性的标尺。在二者的关系中,将任何一方推向极端的做法都是不可取的,因为国家安全与公民权利自由虽然在行动取向上有所不同,但在最终价值取向上却是一致的。国际反恐不能突破国际人权与人道主义法的底线,国家反恐也不能不受人权义务和法律义务的规制。中国的反恐法治化建设,应在反思英美等国反恐问题上的教训基础上,在借鉴其较为完备的反恐立法、反恐机制、反恐措施与经验基础上,破除国家安全和公民权利自由二元对立的思维束缚,平衡好国家安全保障与公民权利自由保障之间的关系,结合中国国情为反恐确立坚实的正当性基础,并在依法治国背景下将之熔铸进体系化的反恐法律体系与机制之中。

关键词：国家安全人权保护正当反恐法治反恐

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单试样测定铝合金JIc的新方法

东北大学学报(自然科学版) 1983年第4期 5-11+129-130+154页

作者：曾梅光,h.L.Marcus 东北工学院金属物理教研室美国得克萨斯大学

本文提出了一个根据载荷-载荷点位移曲线上的柔度变化测定铝合金JIC的单试样法和计算J积分公式: 实验结果表明:使用这种方法测得的JIC值与用多试样法测得结果符合。使用上述公式计算的JIC值和用J=（1+α）/（1+α2）-2A/B（w-α）计算... 详细信息

本文提出了一个根据载荷-载荷点位移曲线上的柔度变化测定铝合金JIC的单试样法和计算J积分公式: 实验结果表明:使用这种方法测得的JIC值与用多试样法测得结果符合。使用上述公式计算的JIC值和用J=（1+α）/（1+α2）-2A/B（w-α）计算的结果相一致。

关键词：多试样法位移曲线裂纹扩展量 Ic 铝合金轻有色金属合金单试样法柔度

Impact of metabolic dysfunction-associated steatotic liver disease on COVID-19 hospitalizations:A propensity-matched analysis of the United States

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World Journal of Virology 2024年第1期13卷 51-60页

作者： Abdullah Sohail hassam Ali Pratik Patel Subanandhini Subramanium Dushyant Singh Dahiya Amir h Sohail Manesh Kumar Gangwani Sanjaya K Satapathy Department of Internal Medicine University of Iowa Roy J and Lucille A Carver College of MedicineIowaIA 52242United States Division of Gastroenterology and hepatology East Carolina University/Brody School of MedicineGreenvilleNC 27858United States Department of Gastroenterology Mather Hospital/Hofstra University Zucker School of MedicineNY11777United States Department of Internal Medicine East Carolina University Brody School of MedicineGreenvilleNC 27834United States Division of Gastroenterology Hepatology&MotilityThe University of Kansas School of MedicineKansas CityKS 66160United States Department of Surgery University of New MexicoAlbuquerqueNM 87106United States Department of Internal Medicine The University of ToledoToledoOH 43606United States Section on Gastroenterology and hepatology North Shore University Hospital and Long Island Jewish Medical CenterManhassetNY 11030United States

BACKGROUND Metabolic dysfunction-associated steatotic liver disease(MASLD),formally known as nonalcoholic fatty liver disease,is the most common chronic liver disease in the United *** with MASLD have been reported to be at a higher risk of developing severe coronavirus disease 2019(COVID-19)and ***,most studies are single-center studies,and nationwide data in the AIM To study the influence of MASLD on COVID-19 hospitalizations during the initial phase of the *** We retrospectively analyzed the 2020 National Inpatient Sample(NIS)database to identify primary COVID-19 hospitalizations based on an underlying diagnosis of MASLD.A matched comparison cohort of COVID-19 hospit-alizations without MASLD was identified from NIS after 1:N propensity score matching based on gender,race,and comorbidities,including hypertension,heart failure,diabetes,and *** primary outcomes included inpatient mortality,length of stay,and hospitalization *** outcomes included the prevalence of systemic *** A total of 2210 hospitalizations with MASLD were matched to 2210 hospitalizations without MASLD,with a good comorbidity ***,there was a higher prevalence of severe disease with more intensive care unit admissions(9.5%vs 7.2%,P=0.007),mechanical ventilation(7.2%vs 5.7%,P=0.03),and septic shock(5.2%vs 2.7%,Phe MASLD cohort than in the non-MASLD ***,there was no difference in mortality(8.6%vs 10%,P=0.49),length of stay(5 d vs 5 d,P=0.25),and hospitalization costs(42081.5$vs 38614$,P=0.15)between the MASLD and non-MASLD *** The presence of MAFLD with or without liver cirrhosis was not associated with increased mortality in COVID-19 hospitalizations;however,there was an increased incidence of severe COVID-19 *** data(2020)predates the availability of COVID-19 vaccines,and many MASLD patients have since been *** will be interesting to see if these trends are

关键词： COVID-19 Metabolic dysfunction-associated steatotic liver disease Prevalence hospital charges Inpatient resource utilization

“regObs”——一个可分享安全管理观测资料的工具

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大坝与安全 2023年第4期 67-71页

作者： P.h.hiller G.h.Midttømme R.Ekker 崔弘毅(翻译) 许传桂(校核) 挪威水资源和能源局不详

及早发现问题、异常现象和事故是对洪水、地质灾害事件等进行有效干预的关键。大坝业主及有关部门必须从一开始就关注这类事件的发展。分享信息对所有相关人员都是有价值的。邀请专业人士和公众参与观测,从而增加安全管理中的观测员人... 详细信息

及早发现问题、异常现象和事故是对洪水、地质灾害事件等进行有效干预的关键。大坝业主及有关部门必须从一开始就关注这类事件的发展。分享信息对所有相关人员都是有价值的。邀请专业人士和公众参与观测,从而增加安全管理中的观测员人数。在挪威,通过利用拥有群众资源的regObs工具,公众和大坝业主能简单地完成相关观测资料的报告和分享。regObs可在“水”、“土”、“雪”和“冰”等预先定义的主题内进行观测,可从网站***获取,也可以从移动应用商店获取。它使用开放的数据政策,每个人都可以注册提交观测资料,也可以看到所有的观测资料。观测有地理坐标作为参考,并遵循基于特定主题的预定义形式。图片和注释也可以轻松地添加在观测资料中。这些观测资料为应急响应行动和全国洪水、滑坡和雪崩预报服务提供了有用的信息。笔者也举例说明了regObs的使用,并强调了其为大坝业主带来的益处。

关键词：挪威 regObs 观测信息分享