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Improvement of Drill Performance in Metal Cutting Using MoST Solid Lubricant Coatings

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材料热处理学报 2004年第5B期25卷 870-874页

作者： N.R. Thomas D.G. Teer S. hickman Teer Coatings Ltd. West Stone House West Stone Berry Hill Industrial Estate Droitwich WR9 9AS UKTeer Coatings Ltd. West Stone House West Stone Berry Hill Industrial Estate Droitwich WR9 9AS UKTeer Coatings Ltd. West Stone House West Stone Berry Hill Industrial Estate Droitwich WR9 9AS UK

Coated tools are widely used in today’s metal cutting industries and have significantly improved machining productivity through reducing operation costs and time. This paper presents the results of a systematic study of the performance of HSS drills coated with CrTiAIN and drills with a top solid lubricant coating of MoST?. The tests were performed on a Haas vertical machining centre under wet and dry cutting conditions to machine through holes in medium carbon steel workpieces. The feed force and torque were recorded throughout some of the tests using a force dynamometer, while the tool wear was monitored and measured. It was found that MoST? coatings even under accelerated conditions improve the tool life significantly based on their unique properties and very low friction.

关键词：金属切割 MoST 固态润滑剂钻头

Foundations of corporate finince / 2rd ed. 2nd ed.

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Stevens-Johnson Syndrome complicated by obstructive uropathy,pneumothorax,and pneumomediastinum:a case report and literature review

2002年

作者： hickman Kent A.

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Burns & Trauma 2019年第1期7卷 125-131页

作者： Damian Bruce-hickman Xiao Jiang Joshua Jin-Ping Thia Amit Kansal Department of Intensive Care Medicine Ng Teng Fong HospitalSingaporeSingap

Background:Stevens-Johnson Syndrome(SJS)is an acute mucocutaneous eruption with blisters of the skin and haemorrhagic erosions of mucous *** report describes air-leak syndrome and obstructive uropathy occurring simultaneously in a teenage patient affected by *** presentation:A 17-year-old Malay female with SJS suffered from bilateral pneumothoraces,pneumomediastinum,and obstructive uropathy as early complications of her *** required intubation,chest tube insertion,and bilateral ureteric stenting as part of her intensive care *** extracutaneous complications of renal and pulmonary systems were likely secondary to widespread epithelial ***:Despite paucity of cases in adult literature,post-renal causes for acute kidney injury must be considered in SJS,especially in the setting of gross *** point-of-care ultrasonography may be a useful tool for excluding obstructive *** is a rare but documented complication of SJS in paediatric cases and,to a lesser extent,adult *** care should be exercised when caring for mechanically ventilated patients suffering from SJS.

关键词： Stevens-Johnson Syndrome Obstructive uropathy Ureteric stenting Pneumothorax Pneumomediastinum

Inoculation with native grassland soils improves native plant species germination in highly disturbed soil

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Grassland Research 2022年第2期1卷 75-83页

作者： Eric B.Duell Karen R.hickman Gail W.T.Wilson Department of Natural Resource Ecology and Management Oklahoma State UniversityStillwaterOklahomaUSA Kansas Biological Survey University of KansasLawrenceKSUSA Environmental Science Program Oklahoma State UniversityStillwaterOKUSA

Background:Grasslands are globally imperiled,facing continued threats from anthropogenic *** remains a common grassland restoration method,and yet,is typically met with limited success,partially because soils of degraded systems inhibit the germination of native ***:We assessed the germination success of 16 native grassland species sown in soils collected from a degraded grassland converted into a nonnative warm‐season perennial grass,Bothriochloa ischaemum,and areas previously subjected to the eradication of this nonnative *** objectives were as follows:(1)determine native seed germination in soils collected from *** or eradication control sites,compared to germination in native grassland soil,and(2)assess if native soil inoculation improves germination,compared to germination in degraded soils without ***:Germination of native species was exceedingly low when seeded into soil dominated by ***,or in soil previously treated with combinations of herbicide and prescribed fire,relative to native grassland ***,amendments with native grassland soil resulted in germination equivalent to native grasslands,alleviating the negative influences of degraded ***:Our results highlight the role of native soil in improving the germination of desirable plant species following intensive management and soil *** research may improve restoration outcomes for managers focused on the conservation and restoration of grasslands.

关键词： Bothriochloa ischaemum invasive species restoration soil inoculation

On Merging Cover Inequalities for Multiple Knapsack Problems

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Open Journal of Optimization 2015年第4期4卷 141-155页

作者： Randal hickman Todd Easton Department of Mathematical Sciences United States Military Academy West Point USA Industrial and Manufacturing Systems Engineering Department Kansas State University Manhattan USA

This paper describes methods to merge two cover inequalities and also simultaneously merge multiple cover inequalities in a multiple knapsack instance. Theoretical results provide conditions under which merged cover inequalities are valid. Polynomial time algorithms are created to find merged cover inequalities. A computational study demonstrates that merged inequalities improve the solution times for benchmark multiple knapsack instances by about 9% on average over CPLEX with default settings.

关键词： Multiple Knapsack Problem Cutting Plane Cover Inequality Inequality Merging Pseudocost Integer Programming

Cohort-based long-term ozone exposure-associated mortality risks with adjusted metrics:A systematic review and meta-analysis

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The Innovation 2022年第3期3卷 43-55页

作者： Haitong Zhe Sun Pei Yu Changxin Lan Michelle WLWan Sebastian hickman Jayaprakash Murulitharan Huizhong Shen Le Yuan Yuming Guo Alexander T.Archibald Centre for Atmospheric Science Yusuf Hamied Department of ChemistryUniversity of CambridgeCambridge CB21EWUK Department of Earth Sciences University of CambridgeCambridge CB23EQUK School of Public Health and Preventive Medicine Monash UniversityMelbourneVIC 3004Australia Institute of Reproductive and Child Health Key Laboratory of Reproductive HealthNational Health Commission of the People’s Republic of ChinaBeijing 100191China Department of Epidemiology and Biostatistics School of Public HealthPeking UniversityBeijing 100191China School of Environmental Science and Engineering Southern University of Science and TechnologyShenzhen 518055China National Centre for Atmospheric Science Cambridge CB21EWUK

Long-term ozone(O_(3))exposure may lead to non-communicable diseases and increase mortality ***,cohort-based studies are relatively rare,and inconsistent exposure metrics impair the credibility of epidemiological evidence *** provide more accurate meta-estimations,this study updates existing systematic reviews by including recent studies and summarizing the quantitative associations between O_(3) exposure and cause-specific mortality risks,based on unified exposure ***-metric conversion factors were estimated linearly by decadal observations during 1990-2019.

关键词： mortality ozone diseases

大数据分析法的可访问性视域下中美中小企业贸易风险防范研究

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大数据分析法的可访问性视域下中美中小企业贸易风险防范研究

作者： Alexander James hickman 西南大学

学位级别：硕士

近几年来中美贸易紧张,特别是今年激烈的中美贸易战给两国经济贸易的各个方面带来了很大的影响,但这两国之间的贸易仍是世界经济贸易的重要组成部分,这两国也在长期的贸易中跟彼此形成了很强依赖关系。其中中美中小企业是中美贸易的主... 详细信息

近几年来中美贸易紧张,特别是今年激烈的中美贸易战给两国经济贸易的各个方面带来了很大的影响,但这两国之间的贸易仍是世界经济贸易的重要组成部分,这两国也在长期的贸易中跟彼此形成了很强依赖关系。其中中美中小企业是中美贸易的主要组成部分,对两国来说中小企业都是重要的经济因素且占据了很高的比重,其促使两国在创新、技术和社会的各方面都取得了很大的进步。但是经营和管理一家进行中美国际贸易的企业有很多困难,除了受限于国际贸易的许多规定之外,公司还必须承担在海外开展业务的外生性风险和内生性风险,以及由于自身特性劣势所导致在进行国际贸易时的阻碍。目前大多数在国际上经营的中小企业通过保险、留置和风险管理等机制保护自己,但是这些管理机制受到时间空间的影响比较大,时效性比较差。风险管理的一种形式是处理业务决策,一个明智的商业决定可以规避风险;另一种方式是获取信息,由于大数据时代的到来,给国际贸易带来了新的机遇和挑战,也给中小企业国际贸易带来机会以及找到风险防御的新的有效方式,现在获取信息的最新最快的方法之一是大数据分析(关于市场、竞争对手、合作伙伴、管理、产品、出货量等信息),如果更多在海外开展业务的中国和美国中小企业能够获得大数据信息和分析技术,市场整体的风险管理将有所改善。然而由于目前大数据的可访问性并不高,进行国际贸易的中美中小企业使用大数据分析技术的并不多,并未能够及时地改进自身风险管理手段,如何通过提高大数据的可访问性,对中美中小企业国际贸易风险进行防御有待研究。此研究通过文献调查法、问卷调查法、数理统计和逻辑分析法对办理中美国际贸易业务的中美中小企业进行调查研究。通过查阅期刊杂志文献和新闻资讯、报纸等了解到更多的研究主题的背景,以及得到一些支持笔者观点的论据,通过对近年来进行中美国际贸易的具有一定代表性的中美中小企业发放问卷,对之后获得的资料进行整理,使用SPSS软件对获得的数据进行分析,分析当大数据的可访问性提高,办理国际贸易业务的中美中小企业是否更积极的使用大数据分析方法来提高对风险的防御,进而分析大数据的可访问性如何提高中美中小企业贸易的风险防御。通过对收集的资料和数据分析表明:首先,随着大数据可访问性的提高,来自中国和美国的更多跨国经营的中小企业将能够及时获得最新准确的信息以做出更好的商业决策,从而很大程度地改善风险管理;第二,由于中小企业的伙伴关系有限和规模较小以及经营半径小,有些中小企业习惯于旧的风险防范管理模式,认为不需要过多的商业研究和决策才能获得更多的利润,且认为过度的风险管理对这些中小企业来说是增加负担,有些中美中小企业则是因为没有能力负担投资支出所以选择不用;第三,中美中小企业贸易存在许多风险;第四,市场上存在着对大数据信息分析的这种需求;第五,文中将大数据划分为3个属性来定义它的可访问性:可负担性、简单性和相关性,大数据的可访问性对中美中小企业贸易风险管理产生了积极影响,数据分析的可访问性提高能够促使中美中小企业在国际贸易中更好的规避风险以及获得更大的收益。通过对大数据可访问性对中美中小企业贸易的风险防御的影响研究分析,文章针对相关问题提出了一些建设性的建议,希望通过此论文让更多的中美中小企业重视大数据分析的使用,从而促进中美两国中小企业贸易的顺利进行,以及让彼此获得更大的效益和发展。

关键词：大数据可访问性中小企业中美贸易国际贸易

Integrated Principles of Zoology 11th ed.

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A Methodology for Producing Uniform Distribution of UO2 in a Tungsten Matrix

2001年

作者： Cleveland P. hickman Roberts Larson

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Journal of Physical Science and Application 2015年第4期5卷 255-262页

作者： Dennis S. Tucker Andrew O'Connor Robert hickman NASA EM32 MSFC Alabama 35812 United State of America Department of Nuclear Engineering Purdue University West Lafayette Indiana 47907 United States of America

We report a method to produce a uniform mixture of uranium dioxide spherical particles in a tungsten matrix. This method involves mixing 0.5 weight percent of high density polyethylene binder with 60 volume percent uranium dioxide spheres and 40 volume percent tungsten powders. Initially, hafnium oxide spheres were used as a surrogate for uranium dioxide spheres. The HfO2/W/PE powders were thoroughly mixed in a Turbula, then mixed on a hot plate above the drop point of the binder. These powders were then densified using spark plasma sintering. Microstructure was evaluated using scanning electron microscopy, density was measured and hardness measurements were made. Initial carbon content of the powders were measured and carbon content of the sintered materials was measured. Subsequently, W/UO2/Binder powders were mixed using the same methodology to ensure the process could be used for this system. These powders were sintered using hot isostatic pressing and microstructures evaluated. The resultant microstructures contained uniform distribution of HfO2 and UO2 particles in the tungsten matrix with very low carbon content.

关键词： Nuclear propulsion tungsten depleted uranium oxide hafnium oxide powder processing spark plasma sintering.