检索结果-南通市图书馆

Innovative boron nitride-doped propellants

Defence Technology（防务技术） 2016年第2期12卷 69-80页

作者： Thelma MANNING Richard FIELD Kenneth KLINGAMAN michael fair John BOLOGNINI Robin CROWNOVER Carlton P.ADAM Viral PANCHAL Eugene ROZUMOV Henry GRAU Paul MATTER michael BEACHY Christopher HOLT Samuel SOPOK USA rmy RDECOM ARDEC Picatinny Arsenal NJ USA pH Matter LLC Columbus OH USA Benet Laboratory Watervliet NY USA

The U.S. military has a need for more powerful propellants with balanced/stoichiometric amounts of fuel and oxidants. However, balanced and more powerful propellants lead to accelerated gun barrel erosion and markedly shortened useful barrel life. Boron nitride(BN) is an interesting potential additive for propellants that could reduce gun wear effects in advanced propellants(US patent pending 2015-026P). Hexagonal boron nitride is a good lubricant that can provide wear resistance and lower flame temperatures for gun barrels. Further, boron can dope steel, which drastically improves its strength and wear resistance, and can block the formation of softer carbides. A scalable synthesis method for producing boron nitride nano-particles that can be readily dispersed into propellants has been developed. Even dispersion of the nano-particles in a double-base propellant has been demonstrated using a solvent-based processing approach. Stability of a composite propellant with the BN additive was verified. In this paper, results from propellant testing of boron nitride nano-composite propellants are presented, including closed bomb and wear and erosion testing. Detailed characterization of the erosion tester substrates before and after firing was obtained by electron microscopy,inductively coupled plasma and x-ray photoelectron spectroscopy. This promising boron nitride additive shows the ability to improve gun wear and erosion resistance without any destabilizing effects to the propellant. Potential applications could include less erosive propellants in propellant ammunition for large, medium and small diameter fire arms.

关键词：复合推进剂六角氮化硼硼掺杂创新型 X射线光电子能谱仪电感耦合等离子体腐蚀测试仪合成方法

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Method for rapid on-site identification of VOCs

引用

Journal of Environmental Sciences 2009年第7期21卷 1005-1008页

作者： Justin D fair William F Bailey Robert A Felty Amy E Gifford Benjamin Shultes Leslie H Volles Department of Chemistry University of Connecticut Storrs Connecticut 06269-3060 USA. INFICON Inc. 2 Technology Place East Syracuse New York 13057 USA

Rapid on-site identification of volatile organic compounds （VOCs） in ambient air is an important first step in remediation efforts. This study describes modification of a commercially available, portable GC/MS system and development of an analysis protocol for rapid （〈 3 min） sampling and identification of VOCs typically found at contaminated sites at the low ppbv level.

关键词： field analysis gas chromatograph mass spectrometer toxic industrial chemicals thermal desorption

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

OBSERVATIONS ON TEACHING ENGLISH WRITING IN CHINA

引用

理工高教研究 2004年第3期23卷 108-110页

作者： Lynn fair

作者在武汉一所重点大学教授英语的经验表明 ,中国学生的英文写作普遍存在很大问题。中国加入世贸组织后 ,与外界打交道的机会越来越多 ,此外 ,许多大学生毕业后想继续到英语国家学习。英语写作能力的提高将有助于国际间的相互交流和理... 详细信息

作者在武汉一所重点大学教授英语的经验表明 ,中国学生的英文写作普遍存在很大问题。中国加入世贸组织后 ,与外界打交道的机会越来越多 ,此外 ,许多大学生毕业后想继续到英语国家学习。英语写作能力的提高将有助于国际间的相互交流和理解 ,以及个人目标的实现。在本论文中 ,作者指出了导致英语写作能力差的主要原因 ,即受本国语言的影响太深 ,教学缺乏持续性 ,学生对写作态度不认真。针对这些原因作者提出了促进英语写作能力提高的6点想法。

关键词：大学英文写作英语教学写作能力写作态度教学策略

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

2012 China Market Suppliers List

引用

China's Foreign Trade 2012年第8期 82-83页

作者： Canton fair Online 黑龙江省富裕县塔哈乡经济和社会事业发展管理中心

Company name: Guangzhou Double Fish Sports Goods Group Co., *** Double Fish Sports Goods Group Co., Ltd. is one of the biggest sports goods manufacturers in China. The major production lines and machines are

关键词：中国市场供应商乒乓球拍名单体育用品国际竞争公司名称生产线

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

项目申请需要公关和攻关吗?

引用

中国科学基金 2005年第6期19卷 352-353页

作者：公平单位不详

本文披露了基金项目申请中利用公关和攻关的不良手段获取不应有的项目资助的现象,对这些不良行为给以了批评。这一现象不但在基金申请中有蔓延的趋势,而且已经波及成果评定、博士点申请以及开放实验室的评估等领域。尽管目前还只是少数... 详细信息

本文披露了基金项目申请中利用公关和攻关的不良手段获取不应有的项目资助的现象,对这些不良行为给以了批评。这一现象不但在基金申请中有蔓延的趋势,而且已经波及成果评定、博士点申请以及开放实验室的评估等领域。尽管目前还只是少数人的行为,但这种不正之风对学术环境的腐蚀和恶劣影响是相当严重的。本文还对如何杜绝这种现象的发生提出了建议。

关键词：项目申请公关和攻关学术腐败不正之风公关基金申请开放实验室项目资助不良行为成果评定

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Inorganic Elements in Eggs of Two Cavity-Nesting Passerine Species at and around Los Alamos National Laboratory, Los Alamos, New Mexico

引用

Journal of Environmental Protection 2018年第9期9卷 932-947页

作者： Shannon Marie Gaukler Charles Dean Hathcock Jeanne Marie fair Environmental Stewardship Group Los Alamos National Laboratory Los Alamos NM USA Biosecurity and Public Health Los Alamos National Laboratory Los Alamos NM USA

Los Alamos National Laboratory (LANL) was established in 1943 as part of the Manhattan Project to build nuclear weapons, and currently operates as a national research laboratory. As part of an ongoing assessment of site-related ecological risk at LANL, western bluebird (Sialia mexicana) and ash-throated flycatcher (Myiarchus cinerascens) eggs were collected from 1997 to 2012 and analyzed for 18 inorganic elements. Concentrations of many inorganic elements in eggs were below reporting limits. Between species comparisons revealed that western bluebird eggs had higher levels of barium while ash-throated flycatcher eggs had higher levels of mercury. No statistically significant differences were observed in concentrations of inorganic elements in western bluebird eggs collected from the study area (which consists of areas within the current and historic LANL boundary) and from a non-industrial reference site;nor were any statistically significant differences observed between two canyons of interest, known to have received effluents and storm water runoff from LANL facilities, and the non-industrial reference site. Inorganic element levels detected in western bluebirds were typically within the range measured in eggs of other passerine in the published literature. These data suggest that concentrations of inorganic elements in passerine eggs collected from the study area appear to be at levels causing negligible risks to local bird populations.

关键词： Ash-Throated Flycatcher Biomonitoring Metals Western Bluebird

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

fair Practices in Europe

引用

Data Intelligence 2020年第1期2卷 257-263,319页

作者： Peter Wittenburg michael Lautenschlager Hannes Thiemann Carsten Baldauf Paul Trilsbeek Max Planck Computing and Data Facility Gießenbachstraße 285748 GarchingGermany DKRZ Ringgold standard institution Bundesstr.45aHamburgHamburg 20146Germany Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4-6Berlin 14195Germany MPI for Psycholinguistics Wundtlaan 1Nijmegen 6525 XDThe Netherlands

Institutions driving fundamental research at the cutting edge such as for example from the Max Planck Society(MPS)took steps to optimize data management and stewardship to be able to address new scientific *** this paper we selected three institutes from the MPS from the areas of humanities,environmental sciences and natural sciences as examples to indicate the efforts to integrate large amounts of data from collaborators worldwide to create a data space that is ready to be exploited to get new insights based on data intensive science *** this integration the typical challenges of fragmentation,bad quality and also social differences had to be *** all three cases,well-managed repositories that are driven by the scientific needs and harmonization principles that have been agreed upon in the community were the core *** is not surprising that these principles are very much aligned with what have now become the fair *** fair principles confirm the correctness of earlier decisions and their clear formulation identified the gaps which the projects need to address.

关键词： Infrastructure fair Metrics GO fair Matrix

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

利用井口套管气压缩延长抽油井的寿命

引用

油气田开发工程译丛 1993年第3期 37-40页

作者： fair.,PW 罗景琪

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

fair： A Call to Make Published Data More Findable, Accessible, Interoperable, and Reusable

引用

Molecular Plant 2018年第9期11卷 1105-1108页

作者： Leonore Reiser Lisa Harper michael Freeling Bin Han Sheng Luan The Arabidopsis Information Resource/Phoenix Bioinformatics Fremont CA 94538 USA Maize Genome Database/United States Department of Agriculture Albany CA 94710 USA Department of Plant Biology University of California Berkeley CA 94720 USA National Center for Gene Research CAS Center for Excellence in Molecular Plant Sciences Institute of Plant Physiology and Ecology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200233 China These authors contributed equally to this article

Biology has become an information-dense, data-intensive enterprise that requires the ability to access, integrate, and compute on large amounts of data. To enable better use of data, stakeholders （scientists, curators, librarians, and journal publishers） have established standards to ensure that data are findable, accessible, interoperable.

关键词：

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

第十二届上海国际机床展展后报告

引用

制造技术与机床 2010年第9期 10-11页

作者： Shanghai International Machine Tool fair Organizing Committee 上海国际机床展组委会

今年以来，国际和国内的经济呈现出非常复杂的走势：一方面，随着国际金融危机的渐行渐远，国际上各主要经济逐渐企稳向好，尤其是中国、印度等新兴国家经济体快速回升，极大地增强了人们的信心；另一方面，经济的回暖尚不稳定，特别是... 详细信息

今年以来，国际和国内的经济呈现出非常复杂的走势：一方面，随着国际金融危机的渐行渐远，国际上各主要经济逐渐企稳向好，尤其是中国、印度等新兴国家经济体快速回升，极大地增强了人们的信心；另一方面，经济的回暖尚不稳定，特别是上半年希腊等欧洲国家出现了严重的主权债务危机，冲击了刚见起色的世界经济。

关键词：国际国家经济机床上海金融危机欧洲国家世界经济不稳定

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：