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Numerical investigation of circle defining curve for two-dimensional problem with general boundaries using the scaled boundary finite element method
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作者 Chung Nguyen VAN 《结构与土木工程前沿:英文版》 EI CSCD 2019年第1期92-102,共11页
The scaled boundary finite element method (SBFEM)is applied to the static analysis of two dimensional elasticity problem,boundary value problems domain with the domain completely described by a circular defining curve... The scaled boundary finite element method (SBFEM)is applied to the static analysis of two dimensional elasticity problem,boundary value problems domain with the domain completely described by a circular defining curve. The scaled boundary finite element equations is formulated within a general framework integrating the influence of the distributed body force,general boundary conditions,and bounded and unbounded domain.This paper investigates the possibility of using exact geometry to form the exact description of the circular defining curve and the standard finite element shape function to approximate the defining curve.Three linear elasticity problems are presented to verify the proposed method with the analytical solution.Numerical examples show the accuracy and efficiency of the proposed method,and the performance is found to be better than using standard linear element for the approximation defining curve on the scaled boundary method. 展开更多
关键词 EXACT GEOMETRY circular defining CURVE general boundaries SBFEM
相互保险组织主要发起会员权利及限制途径探讨 预览
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作者 杨婉青 《河南财经政法大学学报》 2019年第1期47-53,共7页
相互保险作为国际上主要的保险组织形式之一,在全球保险市场中占据重要地位。根据我国保监会要求相互保险组织应由具备良好信誉的主要发起会员发起设立,主要发起会员凭借其为组织筹措初始运营资金及完成其他设立事项而获得的便利条件在... 相互保险作为国际上主要的保险组织形式之一,在全球保险市场中占据重要地位。根据我国保监会要求相互保险组织应由具备良好信誉的主要发起会员发起设立,主要发起会员凭借其为组织筹措初始运营资金及完成其他设立事项而获得的便利条件在相互保险组织内占据控制性地位。由于相互保险组织中处于弱势地位的会员及其他权利主体的权利要求与主要发起会员并不完全一致,因此对主要发起会员权利的适当限制是解决组织内权利冲突和利益失衡的有效方式。立法者和监管者应通过完善制度将主要发起会员的控制权限制在合理范围内。 展开更多
关键词 主要发起会员 控制权 冲突 限制 界限
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多学科圣经研究五十年
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作者 张迎迎(译) 《圣经文学研究》 2019年第1期1-53,共53页
圣经研究作为一个自主和世俗的学科出现,可以追溯至若干时期,尤其能追溯到由宗教改革和启蒙运动引发的文化变迁。然而只是在过去五十年左右,多学科的圣经研究才真正成为独立学科,有别于归属神学而非人文学的圣经学。本文将回溯圣经研究... 圣经研究作为一个自主和世俗的学科出现,可以追溯至若干时期,尤其能追溯到由宗教改革和启蒙运动引发的文化变迁。然而只是在过去五十年左右,多学科的圣经研究才真正成为独立学科,有别于归属神学而非人文学的圣经学。本文将回溯圣经研究这个学科的某些重要主题,特别是世俗化、殖民化和虚构化。这些主题均溯源于文本'意义'如何构成的基本问题,经历了一系列发展。文章最后提出,现在和未来,人文学的圣经研究与神学的圣经学之间的关系将会继续得到更明确的讨论,不过仍不能得到最终解决。 展开更多
关键词 圣经研究 边界 正典 殖民化 批评理论 文化 虚构化 历史 意识形态 意义 复调 圣经学 世俗化 文本 神学
Welding solidification cracking susceptibility and behavior of a Ni-28W-6Cr alloy
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作者 Shuangjian Chen Xiang-Xi Ye +4 位作者 D.K.L.Tsang Li Jiang Kun Yu Chaowen Li Zhijun Li 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第1期29-35,共7页
Welding solidification cracking of alloys is associated with the range of solidification temperature that can be greatly affected by the amount of refractory metals and other additives. In this work, solidification cr... Welding solidification cracking of alloys is associated with the range of solidification temperature that can be greatly affected by the amount of refractory metals and other additives. In this work, solidification cracking of Ni-28W-6Cr alloy with high W content was studied by gas tungsten arc welding, showing that the welding current, alloying elements and precipitates all affect the cracking susceptibility. The lengths of cracks increase linearly with the welding current in the range from 150 to 250 A. The relatively high cracking susceptibility is mainly attributed to the high content of Si, which tends to segregate with other elements including W, Cr, Mn as films or components with low melting point in the last solidification stage and weaken the binding force of grain boundaries. Moreover, the existence of precipitated continuous eutectic M6C carbides in the grain boundaries also acts as nucleation sites of crack initiation, and the cracks often propagate along solidification grain boundary. 展开更多
关键词 WELDING SOLIDIFICATION CRACKING SUSCEPTIBILITY Ni-W-Cr ALLOY Chemical composition Grain boundaries
言论自由及其边界的政治哲学反思
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作者 韩升 刘晓慧 《吉首大学学报:社会科学版》 CSSCI 北大核心 2019年第2期95-101,共7页
言论自由能够促成知识与真理形成和分享以开启民智,能够规范和约束政治权力以确保民主健全,能够促成和完善互信体系以降低社会运行成本,能够培育和养成正直健全的公民人格以达成积极自我实现。在肯定言论自由的价值与意义的同时,还必须... 言论自由能够促成知识与真理形成和分享以开启民智,能够规范和约束政治权力以确保民主健全,能够促成和完善互信体系以降低社会运行成本,能够培育和养成正直健全的公民人格以达成积极自我实现。在肯定言论自由的价值与意义的同时,还必须要考虑言论自由的边界与限度。强调言论自由并非意味着国家和政府的退场与缺席,言论自由意味着言论主体自身具有理性负责态度和能力。要把言论自由放大到自我与他者和谐交往所构成的生活共同体中来看待,将自身生活于其中的生活共同体视为自身言论表达的背景和处境,由此通达去暴力的现代话语政治。 展开更多
关键词 言论自由 边界 生活共同体 话语政治
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Effects of helium implantation on mechanical properties of (Al0.31Cr0.20Fe0.14Ni0.35) O high entropy oxide films
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作者 杨朝明 张坤 +3 位作者 裘南 张海斌 汪渊 陈坚 《中国物理B:英文版》 SCIE EI CAS CSCD 2019年第4期286-292,共7页
It is widely accepted that helium(He) bubbles can prevent dislocations from moving and causing hardening and embrittlement of the material. However, He can affect the mechanical properties of materials in various ways... It is widely accepted that helium(He) bubbles can prevent dislocations from moving and causing hardening and embrittlement of the material. However, He can affect the mechanical properties of materials in various ways. In this work,ultrafine nanocrystal high entropy oxide(HEO) films with He implantation are prepared by using a radio frequency(RF)reactive magnetron sputtering system to investigate the effects of He bubbles located at grain boundary on the mechanical properties of the films. The mechanical properties of the HEO films are investigated systematically via nanoindentation measurements. The results indicate that the grain boundary cavities induced by He implantation can degrade the hardness,the elastic modulus, and the creep resistance of the HEO films. The mechanical properties of the HEO films are sensitive to the interaction between the He bubbles and the dominating defects. 展开更多
关键词 HELIUM ACCUMULATION grain boundaries MECHANICAL properties high-entropy OXIDES
个人信息刑法保护之界限研究
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作者 陈璐 《河南大学学报:社会科学版》 CSSCI 北大核心 2018年第3期72-78,共7页
在《网络安全法》加大侵犯个人信息违法行为处罚力度、两高最新司法解释进一步扩充刑法第253条之一构成要件的背景下,行政法与刑法的界限问题、刑法自身的边界问题变得非常突出,直接影响到罪与非罪的认定。个人信息的刑法保护不仅遭遇... 在《网络安全法》加大侵犯个人信息违法行为处罚力度、两高最新司法解释进一步扩充刑法第253条之一构成要件的背景下,行政法与刑法的界限问题、刑法自身的边界问题变得非常突出,直接影响到罪与非罪的认定。个人信息的刑法保护不仅遭遇行政处罚和刑罚的界限分歧,还遭遇第253条之一构成要件要素自身的界限分歧,主要包括:"公民个人信息"范围的扩大使其边界范围模糊不清;"国家有关规定"的虚置化与冲突性导致其难以发挥罪状的限定作用;"人肉搜索"型侵害行为的范围具有不确定性;"非法收集"型侵害行为的入罪标准不具有实际可操作性。个人信息刑法保护问题本身跨越了宪法、行政法与刑法等法律部门的界限,其界限分歧问题实际上是刑法与宪法、刑法与行政法的界限问题,建立个人信息保护的宪法和行政法秩序、全面搭建个人信息保护的伦理秩序和规则体系可解决该问题。 展开更多
关键词 个人信息 刑法 第253条之一 界限
边界消弭的文本呈现:后人类时代的非自然叙事 预览
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作者 舒凌鸿 《思想战线》 CSSCI 北大核心 2018年第6期123-128,共6页
在后人类时代不断向前发展的过程中,非自然叙事作品也体现了这一时代特色,无论形式还是内容,都体现了后人类时代发展的必然结果:各种概念边界的逐渐消弭。一方面,非自然叙事文本通过反模仿、超常规的方式,凸显非人类叙述者的存在,并呈... 在后人类时代不断向前发展的过程中,非自然叙事作品也体现了这一时代特色,无论形式还是内容,都体现了后人类时代发展的必然结果:各种概念边界的逐渐消弭。一方面,非自然叙事文本通过反模仿、超常规的方式,凸显非人类叙述者的存在,并呈现出叙述者身份的不稳定性;另一方面,在非自然叙事实践中,作者的奇思妙想,在文本的想象世界中完成虚构与现实的无缝对接,同时也在不同文类之间,进行虚构性文本和非虚构性文本的融合试验。大量非自然叙事文本尝试消弭文学中尤为重要的二元观念:虚构与真实的界限。 展开更多
关键词 后人类 非自然叙事 边界 消弭 虚构
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Optimization of Shanghai Marine Environmental Monitoring Sites in the Identification of Boundaries of Different Water Quality Grades 预览
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作者 FAN Haimei GAO Bingbo +4 位作者 WANG Jinfeng QIN Xiaoguang LIU Pengxia HU Maogui XU Peng 《中国海洋大学学报:英文版》 SCIE CAS CSCD 2018年第4期846-854,共9页
Water quality is critical to ensure that marine resources and the environment are utilized in a sustainable manner. The objective of this study is therefore to investigate the optimum placement of marine environmental... Water quality is critical to ensure that marine resources and the environment are utilized in a sustainable manner. The objective of this study is therefore to investigate the optimum placement of marine environmental monitoring sites to monitor water quality in Shanghai, China. To improve the mapping or estimation accuracy of the areas with different water quality grades, the monitoring sites were fixed in transition bands between areas of different grades rather than in other positions. Following bidirectional optimization method, first, 18 candidate sites were selected by filtering out specific site categories. Second, three of these were, in turn, eliminated because of the rule defined by the changes in the areas of water quality grades and by the standard deviation of the interpolation errors of dissolved inorganic nitrogen(DIN) and phosphate(PO_4-P). Furthermore, indicator kriging was employed to depict the transition bands between different water quality grades whenever new sampling sites were added. The four optimization projects of the newly added sites reveal that, all optimized sites were distributed in the transition bands of different water grades, and at the same time in the areas where the historical sites were sparsely distributed. New sites were also found in the overlap region of different transition bands. Additional sites were especially required in these regions to discriminate the boundaries of different water quality grades. Using the bidirectional optimization method of the monitoring sites, the boundaries of different water quality grades could be determined with a higher precision. As a result, the interpolation errors of DIN and PO_4-P could theoretically decrease. 展开更多
关键词 BIDIRECTIONAL OPTIMIZATION method boundaries of water quality GRADES CHANGJIANG River ESTUARY and its adjacent areas transition bands indicator kriging
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行政保障类事业单位的改革实践与发展定位 预览
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作者 邓金霞 《中国人事科学》 2018年第5期21-29,共9页
政府购买服务与事业单位改革高度相关,推进政府购买公共服务的过程,实际上也是鉴别事业单位,包括行政保障类事业单位,承担的服务是否能够并且适宜由市场进行配置的过程,是推进事业单位改革的重要方式。在政府购买服务的政策文件中,对于... 政府购买服务与事业单位改革高度相关,推进政府购买公共服务的过程,实际上也是鉴别事业单位,包括行政保障类事业单位,承担的服务是否能够并且适宜由市场进行配置的过程,是推进事业单位改革的重要方式。在政府购买服务的政策文件中,对于公益类、行政保障类事业单位在政府购买服务中的角色界定不明晰;在政府购买服务的实践中,行政保障类事业单位的参与有利有弊。深化事业单位改革应明确行政保障类事业单位的范围和特点,结合组织间合作的相关理论,考虑一体化、市场化以及混合合作等多种改革可能性。 展开更多
关键词 事业单位 行政保障类 政府购买 组织边界 改革定位
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杜诗“沉郁顿挫”的界域与表现特征
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作者 魏耕原 《古代文学理论研究》 CSSCI 2018年第2期193-212,共20页
对于杜诗的“沉郁顿挫”,向来有不同说法,虽然有所分歧,但基本上大同小异,有把“沉郁”与“顿挫”交叉混淆的趋向.我们认为“沉郁”是就内容而言,“顿挫”则属表现手法.前者是指内容的广阔深厚,后者主要是指语句与章法的抑扬张弛.二者... 对于杜诗的“沉郁顿挫”,向来有不同说法,虽然有所分歧,但基本上大同小异,有把“沉郁”与“顿挫”交叉混淆的趋向.我们认为“沉郁”是就内容而言,“顿挫”则属表现手法.前者是指内容的广阔深厚,后者主要是指语句与章法的抑扬张弛.二者合构成杜诗重、大、深的风格. 展开更多
关键词 杜诗风格 沉郁 顿挫 界域 表现特征
Precise Location of Earthquakes at the Eastern Boundaries of the Sichuan-Yunnan Rhombic Block
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作者 Fu Ying Hu Bin +1 位作者 Long Feng Wang Shiyuan 《中国地震研究:英文版》 CSCD 2018年第4期470-481,共12页
Based on the seismic station data sets from Sichuan and Yunnan provinces,we employed a multi-step seismic location method(Hypo2000+Velest+HypoDD)to precisely locate the 7,787 earthquakes that occurred during 2010-2015... Based on the seismic station data sets from Sichuan and Yunnan provinces,we employed a multi-step seismic location method(Hypo2000+Velest+HypoDD)to precisely locate the 7,787 earthquakes that occurred during 2010-2015 along the eastern boundaries of the Sichuan-Yunnan rhombic block,namely from southern Dawu to the Qiaojia segment.The final results show that location precision is greatly advanced and epicenter distribution exhibits good consistency with the linear distribution of the seismic faults.Earthquake distribution is quite intensive at the intersection region in the southern segment of the Xianshuihe fault,the Anninghe fault zone,the Xiaojinhe fault zone and the Daliangshan fault zone to the east.The depth profile of seismicity shows a clear stepwise activity along the active seismic fault zones.The profile crossing the faults of the Xianshuihe,Anninghe,and Daliangshan presents a complex interaction among faults near the multiple faults intersection region,Shimian,where the earthquakes are obviously divided into two groups in depth.Earthquakes are very rare at the depth of 15km-20km,which is consistent with the region of the plastic rheology between 14km-19km calculated by Zhu Ailan et al.,(2005). 展开更多
关键词 EASTERN boundaries of Sichuan-Yunnan rhombic BLOCK PRECISE LOCATION Hypo2000 HypoDD
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纳米金属材料热稳定性及其表征方法研究进展
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作者 郝尧 李小东 +1 位作者 庞锦标 王柱 《武汉大学学报:理学版》 CSCD 北大核心 2018年第3期189-210,共22页
高温条件下,纳米金属材料晶粒易于长大,导致其强度、硬度等力学性能的退化,这一问题限制了纳米金属材料的工艺发展及应用.纳米金属合金的热稳定性研究致力于通过动力学或热力学手段抑制纳米晶粒高温下的生长,提高纳米金属材料的热稳定性... 高温条件下,纳米金属材料晶粒易于长大,导致其强度、硬度等力学性能的退化,这一问题限制了纳米金属材料的工艺发展及应用.纳米金属合金的热稳定性研究致力于通过动力学或热力学手段抑制纳米晶粒高温下的生长,提高纳米金属材料的热稳定性.本文简要地介绍了纳米金属材料研究中的热力学与动力学机理发展,重点梳理了纳米金属材料热稳定性研究所涉表征方法,包括X射线衍射仪(XRD)、电子显微镜系统(SEM和TEM)、聚焦离子束成像系统(FIB)、热分析系统(TA)、原子探针系统(APT)等,系统地介绍了有限配比纳米合金(纳米铁合金、纳米铜合金、纳米铝合金等)和多元纳米合金(纳米合金钢、氧化物弥散增韧纳米合金等)的热稳定性理论和实验研究,并对当前纳米金属材料的热稳定性研究进行了总结. 展开更多
关键词 纳米金属材料 晶界 晶粒生长 热稳定性
走廊地带多重边界叠合与多民族共同体生成——兼论河西走廊区域研究范式与民族学意义 预览
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作者 李建宗 《思想战线》 CSSCI 北大核心 2018年第4期17-26,共10页
走廊地带地处多个地理板块的连接处,加上其构型的特征,在走廊内外出现了一些边界。这些边界不仅仅是地理意义上的边界,还是文化边界、民族边界。边界的出现,意味着多元耦合的可能性与必然性及新的共同体生成。河西走廊地处四大"地理—... 走廊地带地处多个地理板块的连接处,加上其构型的特征,在走廊内外出现了一些边界。这些边界不仅仅是地理意义上的边界,还是文化边界、民族边界。边界的出现,意味着多元耦合的可能性与必然性及新的共同体生成。河西走廊地处四大"地理—文化"板块之间,既是周边四大区域文化的边界,也是一个多元文化的耦合地带,在此基础上形成了一个西北多民族共同体。这也是河西走廊的民族学意义,同时还为区域研究提供了一种新的范式。 展开更多
关键词 走廊地带 边界 多民族共同体 河西走廊
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Effect of the simultaneous application of a high static magnetic field and a low alternating current on grain structure and grain boundary of pure aluminum
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作者 Chengshuai Li Shaodong Hu +2 位作者 Zhongming Ren Yves Fautrelle Xi Li 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2018年第12期2431-2438,共8页
Effect of the simultaneous application of a high static magnetic field and a low alternating electric current on the solidification structure of pure aluminum has been investigated.Results show that the refinement of ... Effect of the simultaneous application of a high static magnetic field and a low alternating electric current on the solidification structure of pure aluminum has been investigated.Results show that the refinement of the solidification structure is enhanced by the electric current under a certain magnetic field.However, when the magnetic field intensity exceeds a certain value,the refinement is i.mpaired under a certain electric current.The observation by electron backscattered diffraction (EBSD)shows the complex fields have led to the increase of the low angle boundaries with the refinement.Moreover,the application of the static gradient magnetic field is capable of modifying the distribution of the refined grains.The above results may be attributed to the formation of the cavities during the electromagnetic vibration process and the high magnetic field. 展开更多
关键词 Complex FIELDS HIGH magnetic field REFINEMENT GRAIN boundaries
COAL GEOLOGY
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《中国地质文摘:英文版》 2018年第4期109-110,共2页
In order to clarify coal accumulation law in Mid — lower Jurassic in southwest Tarim, through the procedures of comprehensive analysis of previous studies, using profiles, drilling, well logging, core materials, by f... In order to clarify coal accumulation law in Mid — lower Jurassic in southwest Tarim, through the procedures of comprehensive analysis of previous studies, using profiles, drilling, well logging, core materials, by facies changes directions, identifying sedimentary facies and establishing sequence framework, fan, fan delta, delta, lakes and swamps sedimentary facies were identified. By systematic analysis the types of sedimentary facie, sedimentary boundary characteristics and distribution, two sequence boundaries and four sequence boundaries were recognized. 展开更多
关键词 clarify COAL ACCUMULATION SEDIMENTARY FACIES boundaries and FOUR SEQUENCE
Effect of the frequency of high-angle grain boundaries on the corrosion performance of 5wt%Cr steel in a CO2 aqueous environment 预览
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作者 Hui-bin Wu Tao Wu +3 位作者 Gang Niu Tao Li Rui-yan Sun Yang Gu 《矿物冶金与材料学报:英文版》 SCIE EI CAS CSCD 2018年第3期315-324,共10页
The corrosion behavior of 5wt%Cr steel tempered at different temperatures was investigated by immersion testing and electrochemical testing in a CO2 aqueous environment. When the tempering temperature exceeded 500... The corrosion behavior of 5wt%Cr steel tempered at different temperatures was investigated by immersion testing and electrochemical testing in a CO2 aqueous environment. When the tempering temperature exceeded 500°C, the corrosion rate increased. The corrosion layers consisted of Cr-rich compounds, which affected the corrosion behaviors of the steels immersed in the corrosive solution. The results of electrochemical experiments demonstrated that 5wt%Cr steels with different microstructures exhibited pre-passivation characteristics that decreased their corrosion rate. Analysis by electron back-scattered diffraction showed that the frequency of high-angle grain boundaries (HAGBs) and the corrosion rate were well-correlated in specimens tempered at different temperatures. The corrosion rate increased with increasing HAGB frequency. 展开更多
关键词 CHROMIUM steel GRAIN boundaries microstructure corrosion performance TEMPERING temperature
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场域、边界及其产生的条件——评“项目制”研究
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作者 张向东 《华东师范大学学报:哲学社会科学版》 CSSCI 北大核心 2018年第6期121-126,176共7页
“项目制”研究的吸引力和创新性在于其叙事结构的丰富性、生动性和对日常生活实践的深化阐释,这种过程分析的经验研究有效弥补了纯理论研究的抽象性和单一性。但是“项目治国”的过高定位,又导致后来研究者过度化、模式化应用,这一教... “项目制”研究的吸引力和创新性在于其叙事结构的丰富性、生动性和对日常生活实践的深化阐释,这种过程分析的经验研究有效弥补了纯理论研究的抽象性和单一性。但是“项目治国”的过高定位,又导致后来研究者过度化、模式化应用,这一教条化的应用反过来扼杀了其自身的丰富性和多元化的特征。因此,这一研究如果要实现相关研究者的宏大抱负的话,多元研究范式的比较和反思性批判必不可少,而不是对相关领域自身研究视而不见。 展开更多
关键词 “项目制” “项目治国” 场域 边界 条件
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网络暴力探析 预览
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作者 邱赛兰 《科教文汇》 2018年第34期186-188,共3页
互联网的高速发展,快速建构起一个新型社会——网络社会,由于参与网络社会人数极具增加,在实施网络行为中滋生出许多新的社会问题,网络暴力就是其中的问题之一。本文拟对网络暴力进行分析,明确其内涵,区分其与行使相关权利的界限,为净... 互联网的高速发展,快速建构起一个新型社会——网络社会,由于参与网络社会人数极具增加,在实施网络行为中滋生出许多新的社会问题,网络暴力就是其中的问题之一。本文拟对网络暴力进行分析,明确其内涵,区分其与行使相关权利的界限,为净化网络社会环境作出努力。 展开更多
关键词 网络暴力 特征 界限
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从边疆研究的视角看中国地域文化研究
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作者 马大正 《地域文化研究》 2018年第6期4-4,149共2页
开展中国地域文化研究时,应该将中国边疆文化作为一个整体思考、探究;应正确处理好边疆民族文化特色化发展的三个辩证关系;应把边疆民族地区的社会融合战略的构建与实施,作为中国地域文化研究的一项重要内容予以关注,并进行深入的探讨。
关键词 边疆 民族 文化 中国地域文化研究
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