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A comparative study of surface characterization and corrosion behavior of micro-arc oxidation treated Ti-6Al-4V alloy prepared by SEBM and SLM

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Journal of Iron and Steel Research International 2023年第1期30卷 165-175页

作者： Qing-bo Yan Tong Xue Shi-feng Liu Wan-lin Wang Yan Wang Xi Song Xin Yang wei-wei shang Xi’an University of Architecture and Technology Xi’an 710055ShaanxiChina School of Metallurgical and Engineering Xi’an University of Architecture and TechnologyXi’an 710055ShaanxiChina School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048ShaanxiChina Shaanxi Steel Group Industrial Innovation Research Institute Co. Ltd.Hanzhong 723000ShaanxiChina

Additively manufactured Ti-6Al-4V(TC4)parts have been successfully employed as artificial implants in dental and orthopedic surgery due to their excellent mechanical ***,the suboptimal corrosion resistance limits their *** surface characterization and corrosion behavior of micro-arc oxidation(MAO)treated TC4 alloy prepared by selective electron beam melting(SEBM)and selective laser melting(SLM)technologies were *** corrosion resistance mechanism of SLM-MAO and SEBM-MAO was clarified through the analysis of the microstructure evolution,surface morphology,and electrochemical *** results show that the anatase-type TiO_(2) is partially transformed into the slankite phase after MAO *** surface roughness of SEBM sample was reduced by MAO coating,while the surface roughness of SLM sample increased after MAO,which is related to the difference between the microstructure of the deposited samples caused by different additive manufacturing *** MAO time was 15 min,SLM-MAO and SEBM-MAO coating displayed the best and the worst corrosion resistance,respectively.

关键词： TC4 alloy Selective laser melting Selective electron beam melting Micro-arc oxidation Corrosion resistance

Elastic fiber regeneration in vitro and in vivo for treatment of experimental abdominal aortic aneurysm

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Chinese Medical Journal 2013年第3期126卷 437-441页

作者： XIONG Jiang GUO wei wei Ren ZUO shang-wei LIU Xiao-ping ZHANG Tao Department of Vascular and Endovascular Surgery Vascular Surgery Center of People's Liberation Army Chinese People's Liberation Army General Hospital Beijing 100853 China

Background The pathological characteristics of abdominal aortic aneurysm （AAA） involved the regression of extracellular matrix （ECM） in aortic walls, especially elastic structure in medial layer. As the major structural protein of aorta, elastin contributes to the extensibility and elastic recoil of the vessels. We hypothesized that overexpression of elastin in vessel walls might regenerate the elastic structure of ECM, restore the elastic structure of the aneurysmal wall, and eventually lead to a reduction of aortic diameters （ADs） in an experimental model of AAA. Methods Tropoelastin （TE） of Sprague Dawley （SD） rat was synthesized by reverse transcription polymerase chain reaction and used to construct adneviral vectors containing elastin precursor protein （AdTE-GFP）. Cultured vascular smooth muscle cells （VSMCs） from aortas of male SD rats were transfected with AdTE-GFP, AdGFP, adenoviral vector （AdNull）, and phosphate buffered saline （PBS）. Immunofluorescence staining was performed to determine the expression of elastin in transfected cells. The expression of elastic fibers in ECM of VSMCs transfected with AdTE-GFP were detected by fluorescence microscopy and transmission electron microscopy （TEM） at 1, 3, and 5 days following gene transfer. The AAA vessel walls were infused with AdTE-GFP or an empty AdNull, or PBS directly into the aneurysmal lumen. ADs of the aneurysms were compared in infused aortas. Formation of new elastic fibers in vivo was assessed by hematoxylin and eosin, and elastic von-Giesson staining. Recombinant elastin-GFP in vivo was identified by immunohistochemical staining. Results Elastic fibers were increased both in ECM of VSMC and in vessel walls after gene transfer. Histological studies revealed that the AdTE-GFP-transduced aortas had elastic fiber regeneration in the aneurysmal walls. The AdTE-GFP-transduced aortas showed a decreased AD （23.04%±14.49%, P 〈0.01） in AAA vessel walls. Conclusions Elastic fibers have been successfully overex

关键词： abdominal aortic aneurysm elastic fiber adenovirus animal model vascular smooth muscle cell ultr astructure

Therapeutic effects of glucosides of Cheanomeles speciosa on collagen-induced arthritis in mice

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Acta Pharmacologica Sinica 2004年第11期 111-117页

作者： Ling-ling ZHANG, wei wei, shang-xue YAN, Xiang-yang HU, Wu-yi SUNInstitute of Clinical Pharmacology, Anhui Medical University, Hefei 230032, China

AIM: To investigate the therapeutic effect of the glucosides of Cheanomeles speciosa (GCS) on the collagen-induced arthritis (CIA) in mice. METHODS: Mice were divided randomly into six groups, including normal, CIA, CIA+GCS (60, 120, and 240 mg/kg) and CIA+glucosides of Tripterygium wilfordii (GTW) groups. CIA model was based on mice. The effect of GCS in CIA mice was measured by paw-swelling, arthritis scores, and histo-pathological assessment of synovium. Indices of thymus and spleens were measured. Thymocytes and splenocytes proliferation, activity of interleukin-1 (IL-1), and interleukin-2 (IL-2) were assayed by MTT and [3H]TdR method. The level of anti-collagen type Ⅱ (CII) antibody in serum and prostaglandin E (PGE) in ankle were assayed by ELISA and ultraviolet spectrophotometer method, respectively. RESULTS: The onset of paw-swelling was on d 24 after injection of emulsion. The peak of secondary inflammation appeared on d 36 and then declined after d 40. GCS and GTW significantly reduced paw-swe

关键词： glucosides Cheanomeles speciosa experimental arthritis inflammation immunity

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弧齿圆柱齿轮理想几何参数及其加工方法

上海交通大学学报 2010年第12期44卷 1735-1740页

作者：宋爱平吴伟伟高尚高文捷扬州大学机械工程学院江苏扬州225009

在分析多种类似弧齿圆柱齿轮的几何形状参数与加工方法后,提出理想的弧齿圆柱齿轮的几何形状参数,分析弧齿齿轮副齿面的啮合特征,并通过对齿面方程和啮合线方程的图形化直观地表达两齿面的啮合状态,得到弧齿圆柱齿轮理想几何参数是:弧... 详细信息

在分析多种类似弧齿圆柱齿轮的几何形状参数与加工方法后,提出理想的弧齿圆柱齿轮的几何形状参数,分析弧齿齿轮副齿面的啮合特征,并通过对齿面方程和啮合线方程的图形化直观地表达两齿面的啮合状态,得到弧齿圆柱齿轮理想几何参数是:弧齿圆柱齿轮凸齿面与凹齿面弧线半径必须相等,在轮齿的不同径向截面上分度圆处的周向齿厚相等、周向槽宽相等、压力角相等.在此基础上,提出渐开线弧齿圆柱齿轮的加工方法与平行连杆式加工装置.

关键词：圆柱齿轮啮合特征周向模数加工方法

γ辐照老化对高庙子天然钠基膨润土力学强度和变形特性影响研究

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岩土力学 2017年第10期38卷 2949-2956页

作者：刘鹏刘俊新冒海军杨仲田刘伟巫尚蔚王文清西南科技大学土木工程与建筑学院四川绵阳621010 西南科技大学工程材料与结构冲击振动四川省重点实验室四川绵阳621010 中交隧道工程局有限公司华南分公司广东广州510000 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室湖北武汉430071 中国辐射防护研究院中核高放废物地质处置评价技术重点实验室山西太原030006 重庆大学资源及环境科学学院重庆400044

为探究高放核废物深地质处置缓冲材料的长期稳定性,以内蒙古高庙子(GMZ)天然钠基膨润土为研究对象,揭示了γ辐照老化作用对高压实天然钠基膨润土样品力学强度和变形特性的影响。采用钴源在室温下对该膨润土进行不同累积剂量的辐照作用,... 详细信息

为探究高放核废物深地质处置缓冲材料的长期稳定性,以内蒙古高庙子(GMZ)天然钠基膨润土为研究对象,揭示了γ辐照老化作用对高压实天然钠基膨润土样品力学强度和变形特性的影响。采用钴源在室温下对该膨润土进行不同累积剂量的辐照作用,分析了辐照前、后膨润土的矿物成分变化,并开展了三轴剪切以及膨胀变形试验。结果表明:γ辐照老化作用引起膨润土部分矿物成分的变化,蒙脱石微观结构稳定性降低并转化为更稳定的硅酸盐和硅铝酸盐矿物;膨润土经过辐照作用后剪切强度有所增长且随辐照剂量增大,矿物成分发生了变化,同等围压下膨润土的剪切峰值强度逐渐提高;随着围压的增大,强度增长的幅度逐渐变缓,辐照剂量对强度的影响减弱,表明围压对膨润土强度的增长有一定的抑制作用;由于辐照后蒙脱石的含量减少,膨润土的膨胀变形性能相应减弱,即膨胀力、自由膨胀应变、有荷膨胀应变等指标降低。

关键词：辐照老化钠基膨润土蒙脱石力学强度膨胀性能

An all-round Al-Chemist with a scientific mind

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National Science Review 2022年第10期9卷 158-168页

作者： Qing Zhu Fei Zhang Yan Huang Hengyu Xiao Lu Yuan Zhao Xu Chun Zhang Tao Song Xin Sheng Tang Xiang Li Guo He Bao Chen Chong Jun Yi Zhou Yi Han Zhang Baicheng Zhang Jia Qi Cao Man Luo Song Wang Gui Lin Ye Wan Jun Zhang Xin Chen Shuang Cong Donglai Zhou Huirong Li Jialei Li Gang Zou wei wei shang Jun Jiang Yi Luo Hefei National Research Center for Physical Sciences at the Microscale School of Chemistry and Materials Science University of Science and Technology of China School of Information Science and Technology University of Science and Technology of China Hefei Ji Shu Quantum Technology Co.Ltd Hefei National Laboratory University of Science and Technology of China

The realization of automated chemical experiments by robots unveiled the prelude to an artificial intelligence(AI) *** AI-based systems or robots with specific chemical skills have been demonstrated,but conducting all-round scientific research remains ***,we present an all-round AI-Chemist e quipped with scientific data intelligence that is capable of performing basic tasks generally re quired in chemical *** on a service platform,the AI-Chemist is able to automatically read the literatures from a cloud database and propose experimental plans *** can control a mobile robot in-house or online to automatically execute the complete experimental process on 14workstations,including synthesis,characterization and performance *** experimental data can be simultaneously analysed by the computational brain of the AI-Chemist through machine learning and Bayesian optimization,allowing a new hypothesis for the next iteration to be *** competence of the AI-Chemist has been scrutinized by three different chemical *** the future,the more advanced all-round AI-Chemists equipped with scientific data intelligence may cause changes to the landscape of the chemical laboratory.

关键词： AI-Chemist computational brain mobile robot machine reading all-round research

基于极限学习机的交直流混合配电网无功电压控制方法

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电力系统装备 2021年第13期 80-81页

作者：尉尚伟刘瑞峰山西清新新能源科技有限公司山西大同037000

针对传统控制方法在配电网无功电压控制过程中存在网损较大、影响配电网运行效率等问题,结合极限学习机开展对配电网无功电压控制方法的设计研究。通过构建交直流混合配电网无功电压控制目标函数,基于极限学习机的控制变量编码设计了一... 详细信息

针对传统控制方法在配电网无功电压控制过程中存在网损较大、影响配电网运行效率等问题,结合极限学习机开展对配电网无功电压控制方法的设计研究。通过构建交直流混合配电网无功电压控制目标函数,基于极限学习机的控制变量编码设计了一种新的控制方法。再通过对比实验,验证了本文的控制方法与传统控制方法相比网损得到有效降低,提高了能源的转化效率,有效节约了电力能源。

关键词：极限学习机交直流混合配电网无功电压

3β-乙酰氧基-5α,6β-双羥基-6α-甲基-25D-螺甾的重排反应

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化学学报 1962年第6期 385-387页

作者：周維善朱惠祥中国科学院有机化学研究所南京大学化学系进修生

C6上有α-位甲基的甾体副肾皮激素不仅比可的松（cortisone）的疗效更强,而且无纳素保留的副作用。如在C6上再加入一双键如△6-6-甲基可的松,除6α-甲基副肾皮激素的作用外,还有利尿作用。3β-乙酰氧基-5α,6β-双羟基-6α-甲基-25D-螺... 详细信息

C6上有α-位甲基的甾体副肾皮激素不仅比可的松（cortisone）的疗效更强,而且无纳素保留的副作用。如在C6上再加入一双键如△6-6-甲基可的松,除6α-甲基副肾皮激素的作用外,还有利尿作用。3β-乙酰氧基-5α,6β-双羟基-6α-甲基-25D-螺甾（I）是合成△6-6-甲基副肾皮激素的重要中间体。我们在用甲酸试行脱水反应时,希望获得△6-

关键词：重排反应可的松激素甲酸蚁酸饱和脂肪酸甲基链烷基紫外吸收光谱

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吐哈油田水平井新技术应用效果浅析

西南石油大学学报（自然科学版） 2007年第S1期29卷 34-38,6页

作者：李旭东彭玮魏尚武杨均奇康毅吐哈油田公司勘探开发研究院新疆哈密839009

吐哈油田自1996年以来,积极推广应用水平井开发新技术,使水平井技术在吐哈油田开发中的应用规模迅速扩大并取得较好的效果。在水平井开发实践中,不断探索、总结和完善,逐步形成了一套适合吐哈油田不同油藏特点的水平井应用技术方法,主... 详细信息

吐哈油田自1996年以来,积极推广应用水平井开发新技术,使水平井技术在吐哈油田开发中的应用规模迅速扩大并取得较好的效果。在水平井开发实践中,不断探索、总结和完善,逐步形成了一套适合吐哈油田不同油藏特点的水平井应用技术方法,主要包括水平井地质设计技术、水平井跟踪导向技术,确保了水平井在吐哈油田的应用效果,进一步推动了水平井技术在吐哈油田的进步和发展。红南油田底水油藏的高效开发、鲁克沁油田深层稠油油藏开发获得突破等实例证明,所述技术具有较强的实用性、有效性。

关键词：水平井开发新技术应用效果吐哈油田