检索结果-南通市图书馆

Fracturing,caving propagation and influence of mining on groundwater above longwall panels–a review of predictive models

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2020年第1期30卷 49-54页

作者： bruce Hebblewhite School of Minerals and energy Resources engineering University of New South WalesSydney 2052Australia

Historically there have been a number of different hypotheses and empirical models developed in an attempt to describe the nature of fracturing above longwall panels in underground coal *** motivation for suchmodels varies,ranging fromunderstanding the impact ofmining on surface subsidence,to back-analysis of caving behaviour in the immediate roof behind the longwall *** of the most critical motivating factors that is taking on increased importance in many coalfields,is the need for better understanding,and hence prediction of the impact of mining on overlying strata,particularly strata units acting as aquifers for different groundwater *** paper reviews some of the major prediction models in the context of observed behaviour of strata displacement and fracturing above longwall panels in the southern coalfields of New South Wales,south of *** paper discusses the parameter often referred to as"height of fracturing"in terms of the critical parameters that influence it,and the relevance and appropriateness of this terminology in the context of overlying sub-surface subsidence and groundwater *** paper proposes an alternative terminology for this parameter that better reflects what it is and how it is *** paper also addresses the potential role of major bedding shear planes mobilised by mining and their potential influence on overlying subsidence and groundwater interference.

关键词： Longwall mining Subsidence Groundwater Caving Underground coal mining

A Comment on the Hubble expansion Parameter Tension

在线全文

学校读者我要写书评

暂无评论

Impacts of bovine spongiform encephalopathy and avian influenza on U.S. meat demand

International Journal of Astronomy and Astrophysics（天文学与天体物理学国际期刊） 2024年第1期 61页

作者： bruce Hoeneisen

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2015年第6期14卷 1130-1141页

作者： Jianhong e Mu bruce A McCarl Amy Hagerman David Bessler Department of Applied economics Oregon State University Department of Agricultural economics Texas A&M University Center for epidemiology and Animal Health Veterinary Services Animal and Plant Health Inspection Service United States Department of Agriculture

This paper examines the U.S. meat demand impacts of the announced outbreaks of bovine spongiform encephalopathy（BSe） and avian influenza（AI）. Findings indicate that beef and chicken demand was negatively affected by BSe and AI disease outbreaks. Specifically, in the short run, U.S. consumers shift demand due to both outbreaks but more so due to domestic disease outbreaks than for outbreaks occurring overseas-the impact of U.S. AI outbreaks is about 0.5% for beef and the impact of U.S. BSe cases is around –0.42% for beef and 0.4% for pork, respectively. Regarding the BSe shock on meat demand, there is a high rate of beef demand adjusted from disturbance to the long-run equilibrium and a lower adjustment rate for chicken demand because of the repeated outbreaks of AI worldwide. In the long run, information related to severe, persistently recurring overseas animal disease outbreaks changes U.S. consumers＇ meat consumption patterns. Although effects of animal diseases on U.S. meat demand were statistically significant, the magnitudes were small-the impact of WHO reported human death numbers for AI is 0.005% for beef, –0.002% for pork, and –0.006% for chicken and the impact of U.S. BSe cases is 1.1% for pork and –0.7% for chicken.

关键词： spongiform avian chicken bovine encephalopathy overseas disturbance adjustment pathogenic deaths

Are James Webb Space Telescope Observations Consistent with Warm Dark Matter?

在线全文

学校读者我要写书评

暂无评论

International Journal of Astronomy and Astrophysics（天文学与天体物理学国际期刊） 2024年第1期 45页

作者： bruce Hoeneisen

来源：博看期刊评论

在线全文

博看期刊

学校读者我要写书评

暂无评论

发射市场的客户为何离不开SpaceX

商业周刊（中文版） 2024年第1期 16-17页

作者： bruce einhorn Shinhye Kang Heejin Kim Nicholas Takahashi 融汐(译) 不详

海伦·休比(Helene Huby)想在欧洲太空历史上留下一笔。作为可重复使用太空舱开发商exploration Co.的首席执行官,她帮助自己的初创公司在2022年赢得了阿丽亚娜6号(Ariane6)上的一个便宜位置。阿丽亚娜6号是欧洲打算匹敌马斯克旗下Space... 详细信息

海伦·休比(Helene Huby)想在欧洲太空历史上留下一笔。作为可重复使用太空舱开发商exploration Co.的首席执行官,她帮助自己的初创公司在2022年赢得了阿丽亚娜6号(Ariane6)上的一个便宜位置。阿丽亚娜6号是欧洲打算匹敌马斯克旗下SpaceX公司系列火箭的产品。

关键词：初创公司阿丽亚娜首席执行官 Hub 开发商

The art and science of species delimitation

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

Current Zoology 2015年第5期61卷 846-853页

作者： bruce RANNALA Department of evolution and ecology University of California Davis Davis CA 95616 USA

DNA-based approaches to systematics have changed dramatically during the last two decades with the rise of DNA barcoding methods and newer multi-locus methods for species delimitation. During the last half-decade, partly driven by the new sequencing technologies, the focus has shifted to multi-locus sequence data and the identification of species within the frame-work of the multi-species coalescent （MSC）. In this paper, I discuss model-based Bayesian methods for species delimitation that have been developed in recent years using the MSC. Several approximate methods for species delimitation （and their limitations） are also discussed. explicit species delimitation models have the advantage of clarifying more precisely what is being delimited and what assumptions we are making in doing so. Moreover, the methods can be very powerful when applied to large multi-locus datasets and thus take full advantage of data generated using today＇s technologies [Current Zoology 61 （5）： 846-853,2015].

关键词： Bayesian species delimitation Species concepts Multi-species coalescent

Architectural and personal influences on neishborin8 behaviors;

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

Frontiers of Architectural Research 2016年第2期5卷 194-201页

作者： bruce K. Fersuson Derek e. Ferguson 1027 Parkview Bird Pittsburgh PA 15217 USA Virginia Commonwealth University Richmond VA 23284 USA

Architectural and personal influences on neighboring behaviors were studied in a residential neighborhood using both qualitative informal conversations, and systematic recording of activity in the neighborhood＇s social space. This dual approach produced new insights into neighboring behaviors and social networks. It was discovered that the residents who participated in the social space were only a portion of the resident population. There was an additional neighborhood-based network whose neighboring was not conducted in the social space; instead it was maintained by direct house-to-house contact. It was also found that some individuals chose not to participate in any neighborhood social network. The social space was an effective neighboring venue for those residents who chose to use it, but did not attract commingling of groups. Contrary to an assumption in previous neighboring research, there are social groups which develop and maintain themselves without participation in a social space.

关键词： Neighborhood Social network Community Residential design Shared space

Study of electron Beam Surfi-sculpt during Composite Materials Joining

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2011年第S4期40卷 292-296页

作者： bruce Dance The Welding Institute(TWI) Cambridge CB1 6ALUK

electron beam surfi-sculpt is a new metal surface processing technology,which is widely used in the areas of materials surface treatment,composite materials manufacturing,and so *** this paper,comeld technology,which was an application technology of electron beam surfi-sculpt during composite materials area,was *** tensile experiments results and failure forms of Ti6Al4V/Carbon fibre single step joints were compared with different joining methods,such as slick embedding,adhesive bonding,riveting and *** was found that comeld joint had more advantage of tensile property than other joining *** the same time,tensile process of comeld joint was analyzed with numerical simulation,and key factors of protrusions influenced tensile property were obtained,which was of importance to structure design and joint property improvement.

关键词： electron beam surfi-sculpt comeld joining methods tensile experiments numerical simulation

A review of the geomechanics aspects of a double fatality coal burst at Austar Colliery in NSW,Australia in April 2014

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2017年第1期27卷 3-7页

作者： Hebblewhite bruce Calvin Jim School of Mining engineering UNSWSydney 2052Australia

A coal burst occurred on 15 April, 2014 at the Austar Coal Mine, located west of Newcastle, NSW,Australia. The burst resulted in fatal injuries to two men working as part of the mining crew at the development face. At the time, a continuous miner was being used to mine a longwall development gate road through heavily structured coal, at a depth of approximately 550 m. A number of pre-cursor bumps had occurred on previous shifts, emanating from the coal ribs of the roadway, in proximity to the coal *** paper reviews the geological, geotechnical and mining conditions and circumstances leading up to the coal burst event; and presents and discusses the available evidence and possible interpretations relating to the geomechanical behaviour mechanisms that may have been critical factors in this incident. The paper also discusses some key technical and operational considerations of ground support systems and mining practices and strategies needed for operating in such conditions in the future.

关键词： Underground coal mining Roadway development Strata controlCoal burst Coal geology Mine safety