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Shear Band Formation in AISI 4340 Steel Under Dynamic Impact Loads:Modeling and Experiment

Acta Metallurgica Sinica(English Letters) 2013年第4期26卷 378-384页

作者： Daniel Odoh Gbadebo Owolabi Akindele Odeshi horace Whitworth Department of Mechanical Engineering Howard University Department of Mechanical Engineering University of Saskatchewan57 Campus DriveSaskatoonSKS7N 5A9Canada

In this study, the occurrence of the adiabatic shear bands in AISI 4340 steel under high velocity impact loading was investigated using finite element analysis and experimental tests. The cylindrical specimen subjected to the impact load was divided into different regions separated by nodes using finite element method in ABAQUS environment with boundary conditions specified. The material properties were assumed to be lower in the region where the probability of strain localization is high based on prior experimental results in order to initialize the formation of the adiabatic shear bands. The finite element model was used to determine the maximum flow stress, the strain hardening, the thermal softening, and the time to reach the critical strain for the formation of adiabatic shear bands. Experimental results show that deformed bands were formed at low strain rates and there was a minimum strain rate required for the formation of the transformed band in the alloy and the cracks were initiated and propagated along the transformed bands leading to fragmentation under the impact loading. The susceptibility of the adiabatic shear bands to cracking was markedly influenced by the strain-rates and the initial material microstructure. The simulation results obtained were compared with the experimental results obtained from the AISI 4340 steel under high strain-rate loading in compression using split impact Hopkinson bars. A good agreement between the experimental and simulation results was obtained.

关键词： Adiabatic shear bands Finite element model Strain hardening Thermal softening Johnson-Cook model AISI 4340 steel

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Students’Misconceptions are Falsely Measured by Concept Inventory Tests While Lack of Prior Knowledge is Ignored

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Journal of Contemporary Educational Research 2019年第2期3卷 1-11页

作者： horace Crogman Department of Physics San Bernardino Valley CollegeCA92410United States Research and Development The Institute of Effective ThinkingRiversideCAUnited States Department of Physics Mount San Antonio CollegeCA91789United States

Concept inventory(CI)tests are used to measure students’*** article investigated and concludes that the current format of these tests is unable to measure students’misconceptions since the answers choices do not reflect student lack of prior knowledge,time lapse between when they learned the subject matter and when they try to recall it,and the conditions through which students construct their *** are better suited as tools to evaluate the effectiveness of pedagogical effectiveness and language in communicating the material to the students.

关键词： concept inventory conceptual conflict misconception misunderstanding

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基于协同神经网络的仿射不变性检索相似性度量方法(英文)

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红外与毫米波学报 2002年第5期21卷 327-331页

作者：戚飞虎赵同 horace HSIp 上海交通大学计算机科学与工程系 Image Computing Group Department of Computer Science City University of Hong Kong 200030 Hong Kong

根据协同神经网络 ,提出了一种新的控制参数———序矢量 ,并着重研究了其在图像检索方面的相关性质 .在此基础上 ,针对商标图像检索 ,提出了一种高效的基于元素的仿射不变性度量方法 .实验表明 ,该检索算法抗噪、抗缺损能力强 ,同时对... 详细信息

根据协同神经网络 ,提出了一种新的控制参数———序矢量 ,并着重研究了其在图像检索方面的相关性质 .在此基础上 ,针对商标图像检索 ,提出了一种高效的基于元素的仿射不变性度量方法 .实验表明 ,该检索算法抗噪、抗缺损能力强 ,同时对于平移、旋转、缩放具有不变性 .

关键词：图像检索相似性度量仿射不变性协同神经网络

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Proteins in DNA methylation and their role in neural stem cell proliferation and differentiation

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Cell Regeneration 2021年第1期10卷 64-75页

作者： Jiaqi Sun Junzheng Yang Xiaoli Miao horace HLoh Duanqing Pei Hui Zheng Bioland Laboratory(Guangzhou Regenerative Medicine and Health Guangdong Laboratory) #188 Kaiyuan Ave.Science CityHuangpu DistrictGuangzhou 510700China CAS Key Laboratory of Regenerative Biology Guangzhou Institutes of Biomedicine and HealthChinese Academy of SciencesGuangzhou 510530China Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine Guangzhou 510530China Institutes for Stem Cell and Regeneration Chinese Academy of SciencesBeijing 100101China School of Life Science Westlake UniversityHangzhou 310024China

Background:Epigenetic modifications,namely non-coding RNAs,DNA methylation,and histone modifications such as methylation,phosphorylation,acetylation,ubiquitylation,and sumoylation play a significant role in brain *** methyltransferases,methyl-CpG binding proteins,and ten-eleven translocation proteins facilitate the maintenance,interpretation,and removal of DNA methylation,*** forms of methylation,including 5-methylcytosine,5-hydroxymethylcytosine,and other oxidized forms,have been detected by recently developed sequencing *** evidence suggests that the diversity of DNA methylation patterns in the brain plays a key role in fine-tuning and coordinating gene expression in the development,plasticity,and disorders of the mammalian central nervous *** stem cells(NSCs),originating from the neuroepithelium,generate neurons and glial cells in the central nervous system and contribute to brain plasticity in the adult mammalian *** body:Here,we summarized recent research in proteins responsible for the establishment,maintenance,interpretation,and removal of DNA methylation and those involved in the regulation of the proliferation and differentiation of *** addition,we discussed the interactions of chemicals with epigenetic pathways to regulate NSCs as well as the connections between proteins involved in DNA methylation and human ***:Understanding the interplay between DNA methylation and NSCs in a broad biological context can facilitate the related studies and reduce potential misunderstanding.

关键词： DNA methylation Neural stem cells DNA methyltransferases Methyl-CpG binding proteins Ten-eleven translocations Vitamin C

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Shepherding Public Discourse Practices： Homiletic Form Aligned to the Logic Operative in Racial Rhetoric and Public Theological Discourse for Secular Liberal Democracies

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Cultural and Religious Studies 2016年第9期4卷 576-588页

作者： Maury Jackson horace Crogman La Sierra University HMS Richards Divinity School Riverside USA The Institute of Effective Thinking Riverside USA College of the Desert Palm Spring USA

Given that preaching is the primary mode of public theological discourse for most Christian ministers, an intellectual virtue of verbal restraint is required when practicing public theology and it is wise to address the ways that homilies can shepherd public discourse practices. A theology of rhetoric includes the homilist＇s moral purpose. Homilies either enhance public discourse or pervert it. This essay sketches a pattern of sermon movement that respects the logic operative in public theology, given the social context of America. Homilies can help cultivate the pastoral care of public rhetoric by modeling discourse that nurtures the politics of accountability. While many call for a public ethos where divergent moral voices engage each other in highly contested arenas, a precondition to practicing effective public theology requires that one exercises discourse in a way that respects the social limits on the free exercise of religion. It is important that a public theology of rhetoric clarifies the original social agreement for acceptable religious discourse in the public arena. Homiletics, as a dimension of practical theology, can teach preachers methods of pastoral care for public discourse. The social agreement in liberal democracies to contain the combative nature of religious discourse assumes a logic that is circumscribed by commitments to （1） religious pluralism, （2） theological agnosticism, and （3） epistemological pragmatism. Here we propose that a sermon＇s form, which implicitly touches upon these commitments, can tap into the basic modes of persuasion in secular liberal societies. This respects the moral purposes previously agreed upon and expected of partisans during highly contestable times. This calls for incarnational humility on the part of the Christian public theologian and it guides her/his practice.

关键词： homiletics liberal democracy secularization Bonhoeffer radical theology rhetoric

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BRICS Bank Challenges the Exorbitant Privilege of the U.S. Dollar

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China International Business 2014年第8期 32-37页

作者： horace G. CAMPBELL

At the end of the sixth Brazil, Russia, India, China and South Africa （BRICS） summit in Fortaleza,Brazil on July 16, 2014, the leaders announced the Fortaleza Action Plan. This was in the context of the Fortaleza Declaration＇ where the leaders reinforced their position that BRICS would be an international force in challenging the neo-liberal policies of the Washington Consensus. Touching on areas of major destabilization in the world - from Syria to Sudan and from Ukraine to Iraq - the leaders spelt out the need for new paths to peace and for strengthening the United Nations to resolve the outstanding questions of war and insecurity.

关键词：金砖特权过度美元银行新自由主义领导人俄罗斯

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Avoidance of Cross-Tier Interference from Open Access Femtocells to Macrocell Users

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通讯和计算机（中英文版） 2012年第8期9卷 929-941页

作者： Shahryar Saleem horace King School of Engineering and Science Victoria University Melbourne Victoria 8001 Australia

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The Twisted Fate of the King James Version and the Black Religious Experience in America

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Cultural and Religious Studies 2019年第9期7卷 490-497页

作者： Maury Jackson horace Crogman La Sierra University RiversideUSA California State University Dominguez Hills Carson CAUSA

The only version of the Bible African slaves in the English colonies known to exist was the King James Version(KJV).In reflecting on the 400th centennial of the arrival of African captives to America and the 1611 King James Version,African American church scholars do well to mark this occasion,not so much for what the biblical text did to reform the church in Europe,but to commemorate its role in forming a *** they published the King James Scripture,those 54 language scholars of 1611 no doubt understood the impact they would make as reformers of European *** may not have imagined their work would have such a profound impact on the formation of a community of abducted *** fellow brothers and sisters in captivity would teach the purveyors of the King James Version how subversive their text is to human political,economic,and religious institutions.

关键词： King James Black American Black Church Black History Religious Education

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基于耳石微化学的黄海沿岸刀鲚生境指纹研究

基于耳石微化学的黄海沿岸刀鲚生境指纹研究

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作者： horace MENSAH 南京农业大学

学位级别：硕士

黄海位于东海以北。从长江口通往韩国济州岛的一线分界了东、黄海。黄海本身（不包括渤海）的面积约为380,000平方公里;其平均深度为44米,最大深度约为152米。刀鲚通常分布在中国长江的中下游、黄海和东海及其沿岸河流。朝鲜半岛西部沿... 详细信息

黄海位于东海以北。从长江口通往韩国济州岛的一线分界了东、黄海。黄海本身（不包括渤海）的面积约为380,000平方公里;其平均深度为44米,最大深度约为152米。刀鲚通常分布在中国长江的中下游、黄海和东海及其沿岸河流。朝鲜半岛西部沿海和日本有明海水域也有分布。这种鱼类通常栖息在近海水域和淡水河流中。由于其味道鲜美且具有很高的营养价值,其价格也十分昂贵。作为洄游性的种类,每年产卵季节刀鲚都会从沿海水域溯河洄游到淡水地区。洄游行动的发生、时间和程度可对其资源种群的生态过程产生重大影响。值得注意的是,了解鱼类种群的空间结构及其内部和之间的连通性是可持续渔业管理的一个重要先决条件。值得注意的是,值得注意的是,长江中的刀鲚可能会进入黄海南部觅食,甚至成为黄海水域的一种“典型“种类。然而,目前对黄海近岸水域刀鲚的溯河洄游生活史尚研究不足。本研究的目的是分别使用电子探针微区分析（EPMA）分析了黄海近岸两个不同水域的刀鲚（第1组:采自启东（QDCE）水域、第2组:采自大洋港（DYCE）水域）耳石中锶和钙的环境特征,并确定这些刀鲚经历过的生境。本研究选择耳石微化学是由于它能够确定出生起源或孵化区,确定成鱼的来源水域,并估计种群结构和区分种群类型,以满足确定生境依存、生活史特征和洄游模式的目的。本研究所分析的这两个水域的刀鲚耳石面分布分析及定量线分析结果表明,启东水域的所有样本都显示出类似的模式。刀鲚耳石面分布分析及定量线分析表明来自黄海启东水域采样点的刀鲚显示了一个更宽的蓝色核心区域（低Sr:Ca比＜3）,显示这一部分刀鲚个体出生在淡水中,并在淡水环境中度过了较长时间。然后与核心区域相邻区域显示为蓝色和绿色或黄色之间交替,这与刀鲚的洄游行为相对应。它们利用淡水产卵,再利用河口环境进行育幼、栖息、索饵,并在一定程度上将黄海作为索饵和生长区,而大洋港水域刀鲚中除1个体外,所有个体都具有复杂的Sr:Ca比率变化性。从每个个体的面分布分析结果显示,根据耳石核心及周围区域的Sr:Ca值,本研究中的刀鲚可以分为三组,即第1组为蓝色核心,核心周围蓝色区域明显较宽。第2组为蓝色核心,核心周围区域较短。相比之下,第3组具有的绿色核心区域,表明其为河口孵化型。核心周围的区域交替出现蓝色和绿色或淡黄色,显示了它们的洄游特征。总体而言,黄海的刀鲚具有淡水和河口孵化两种早期生活史。该物种在淡水和河口之间频繁迁移,大部分具有在黄海中索饵的经历。本研究提供了对黄海两个不同地点的刀鲚生境利用特征的综合见解,为今后在这些重要地区对这种珍贵的鱼类进行有效管理、保护和可持续利用提供了非常有用的基本信息。

关键词：刀鲚黄海耳石锶钙电子探针微量分析生活史

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A robust watermarking scheme for 3D triangular mesh models

A robust watermarking scheme for 3D triangular mesh models

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第一届信号与信息处理联合学术会议

作者： horace H.S.Ip Research Centre for Media Technology Department of Computer Science City University of Hong Kong Tat Chee Avenue KowloonHong

In this paper we propose a robust 3D model watermarking scheme for triangle meshes. Our approach embeds watermark information by modifying the length of the vectors that link vertices to the centre of the model. Particularly, our approach is able distribute information corresponds to a bit of the watermark over the entire model and the strength of the watermark signal is adaptive with respect to the local geometry of the model. Experiments show that this watermarking scheme is robust against attacks such as mesh simplification, addition of noise, and model cropping.

关键词： Digital watermarking 3D model Triangular naeshes.

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