检索结果-南通市图书馆

Speculations on the mechanisms for the formation and breakup of supercontinents

作者： (英)弗朗西斯·哈斯克尔(francis Haskell)

来源：南通市图书馆图书评论

学校读者我要写书评

暂无评论

Geoscience Frontiers 2013年第2期4卷 185-194页

作者： j.Brendan Murphy R.Damian Nance Department of Earth Sciences.St.francis Xavier University Antigonish.Nova Scotia B2G 2W5Canada Department of Geological Sciences Ohio UniversityAthensOH 45701USA

The supercontinent cycle has had a profound effect on the Earth＇s evolution since the Late Archean but our understanding of the forces responsible for its operation remains *** appear to form by two end-member processes：extroversion,in which the oceanic lithosphere surrounding the supercontinent（exterior ocean） is preferentially subducted（***）,and introversion in which the oceanic lithosphere formed between dispersing fragments of the previous supercontinent（interior ocean） is preferentially subducted（***）.Extroversion can be explained by ＂top-down＂ geodynamics, in which a supercontinent breaks up over a geoid high and amalgamates above a geoid low. Introversion,on the other hand,requires that the combined forces of slab-pull and ridge push（which operate in concert after supercontinent break-up） must be overcome in order to enable the previously dispersing continents to turn *** may begin when subduction zones are initiated along boundaries between the interior and exterior oceans and become trapped within the interior *** speculate that the reversal in continental motion required for introversion may be induced by slab avalanche events that trigger the rise of superplumes from the core-mantle boundary.

关键词： Supercontinent cycle Introversion Extroversion Pangea Rodinia Pannotia

origins of the supercontinent cycle

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2013年第4期4卷 439-448页

作者： R.Damian Nance j.Brendan Murphy Department of Geological Sciences.316 Clippinger Laboratories.Ohio University.Athens.OH 45701.USA Department of Earth Sciences st.Francis Xavier UniversityAntigonishNova Scotia B2G 2W5.Canada

The supercontinent cycle, by which Earth history is seen as having been punctuated by the episodic assembly and breakup of supercontinents, has influenced the rock record more than any other geologic phenomena, and its recognition is arguably the most important advance in Earth Science since plate tectonics. It documents fundamental aspects of the planet＇s interior dynamics and has charted the course of Earth＇s tectonic, climatic and biogeochemical evolution for billions of years. But while the widespread realization of the importance of supercontinents in Earth history is a relatively recent development, the supercontinent cycle was first proposed thirty years ago and episodicity in tectonic processes was recognized long before plate tectonics provided a potential explanation for its occurrence. With interest in the supercontinent cycle gaining momentum and the literature expanding rapidly, it is instructive to recall the historical context from which the concept developed. Here we examine the supercontinent cycle from this perspective by tracing its development from the early recognition of long-term epi- sodicity in tectonic processes, through the identification of tectonic cycles following the advent of plate tectonics, to the first realization that these phenomena were the manifestation of episodic superconti- nent assembly and breakup.

关键词： Supercontinent cyclePlate tectonicsTectonic episodicitySecular trends

美国城市中的流浪猫治理:一项日益重要的公共政策事件

在线全文

学校读者我要写书评

暂无评论

全球城市研究（中英文） 2022年第4期3卷 107-128,191页

作者：彼得·j.沃尔夫弗朗西斯·汉密尔顿胡维(译) 美国动物之友协会美国佛罗里达州埃克德学院不详

市民对当地选举和任命的官员报以期望,期望他们能制定、实施并评估公共政策。近年来,各地市民努力增加美国动物收容所的宠物的活释数量,这得到了动物福利倡导者、主流媒体和决策者的极大关注。城市里的动物收容所的一大挑战是管理泛滥... 详细信息

市民对当地选举和任命的官员报以期望,期望他们能制定、实施并评估公共政策。近年来,各地市民努力增加美国动物收容所的宠物的活释数量,这得到了动物福利倡导者、主流媒体和决策者的极大关注。城市里的动物收容所的一大挑战是管理泛滥成灾的“社区”猫即流浪猫。管理流浪猫主要有三种政策,清除法、诱捕扑杀法、绝育接种放归法(TNVR)。州政府和下级地方政府直接参与流浪猫的管理政策,因而影响其决策的重要因素是公众意见和纳税人资助,尤其是最近呼声甚高的推动“不杀生”动物收容所,即让进入收容所的90%以上的动物活着释放出来。

关键词：城市流浪猫动物收容公共管理政策

在线全文

学校读者我要写书评

暂无评论

BooK REVIEW

International journal of Digital Earth 2014年第3期7卷 173-174页

作者： j.L.van Genderen Department of Earth observation Science Faculty of Geoinformation Science and Earth observation University of Twente

only one Earth:the long road via Rio to sustainable development,edited by *** and ***,London and New York,Routledge,Taylor&francis Group,2012,312 pp.,(hbk),ISBN 978-0-415-54025-4 This well-written book traces the history and development of the long,and often painful,journey from the original Stockholm Summit of 1972,via the Rio Conference of 1992,to the‘RIo+20’held this year.

关键词： Rio Earth journey

《病人既是受害者又是传播者:伦理学与传染病》

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

《病人既是受害者又是传播者:伦理学与传染病》

作者： Margaret P.Battin Leslie P.francis j.A.jacobson Charles B.Smith

Bioethical Inquiry(2009)6:249-250.2009New York:oxford University Press,ISBN 019533583X这本新书是哲学家和医生的集体努力,既作为生命伦理学领域的声明,又是给医学、公共卫生和生命伦理学学生的有价值的课文。它写得很亲切,优美,...

Bioethical Inquiry(2009)6:249-250.2009New York:oxford University Press,ISBN 019533583X这本新书是哲学家和医生的集体努力,既作为生命伦理学领域的声明,又是给医学、公共卫生和生命伦理学学生的有价值的课文。它写得很亲切,优美,令人折服,又具有刺激性。Battin和她的同事从既是生物学的,又是社会文化的深刻见解开始:人全都一起生活在潜在的和实际的疾病网络之中。即使当他们眼下没有生病,也没有意识到传播的可能的时候,不

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

肾主骨的实质和骨碎补

肾主骨的实质和骨碎补

Experimental investigations of transient pressure variations in a high head model francis turbine during start-up and shutdown

中华中医药学会第二十一届全国中医肾病学术会议

作者：龙勉李顺祥肖江峰王健 Scott Lozanoff Benjamin j.Luft francis johnson Department of Complementary and Alternative Medicine University of Hawai'i at Manoa.John A.Burns School of Medicine 96813 USA 湖南省中医药研究院药化室江苏江山制药厂 Department of Anatomy Biochemistry and Physiology University of Hawai'i at ManoaJohn A.Burns School of Medicine 96813 USA Department of Medicine State University of New York at Stony Brook11794-8160 Department of Chemistry State University of New York at Stony Brook11794-3400 USA

背景:中国中医药学脏腑理论中关于肾的理论重点强调"肾主骨,开窍于耳".在几千年的临床医疗实践中以其作为诊断和治疗原则都能取到很好的效果.例如,在诊断中,一般认为肾虚的病人常常继发骨质疏松或耳聋.在治疗骨质疏松或耳聋时都会选材...

背景:中国中医药学脏腑理论中关于肾的理论重点强调"肾主骨,开窍于耳".在几千年的临床医疗实践中以其作为诊断和治疗原则都能取到很好的效果.例如,在诊断中,一般认为肾虚的病人常常继发骨质疏松或耳聋.在治疗骨质疏松或耳聋时都会选材选择入肾经或补肾的药材,从提高肾功能入手.现代医学观察到66%需要肾移植的病人同

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

journal of Hydrodynamics 2014年第2期26卷 277-290页

作者： TRIVEDI Chirag CERVANTES Michel j. GANDHI B.K. oLE DAHLHAUG G. Division of Fluid and Experimental Mechanics Department of Engineering Sciences and Mathematics Lule? University of Technology Department of Mechanical and Industrial Engineering Indian Institute of Technology Water Power Laboratory Department of Energy and Process Engineering Norwegian University of Science and Technology

Penetration of the power generated using wind and solar energy to electrical grid network causing several incidents of the grid tripping, power outage, and frequency drooping. This has increased restart （star-stop） cycles of the hydroelectric turbines significantly since grid connected hydroelectric turbines are widely used to manage critical conditions of the grid. Each cycle induces significant stresses due to unsteady pressure loading on the runner blades. The presented work investigates the pressure loading to a high head （ He = 377 m, De = 1.78 m） francis turbine during start-stop. The measurements were carried out on a scaled model turbine （HM = 12.5 m, DM = 0.349 m）. Total four operating points were considered. At each operating point, three schemes of guide vanes opening and three schemes of guide vanes closing were investigated. The results show that total head variation is up to 9% during start-stop of the turbine. on the runner blade, the maximum pressure amplitudes are about 14 kPa and 16 kPa from the instantaneous mean value of 121 kPa during rapid start-up and shutdown, respectively, which are about 1.5 times larger than that of the slow start-up and shutdown. Moreover, the maximum pressure fluctuations are given at the blade trailing edge.

关键词： francis turbine pressure fluctuations start-up shutdown transient

An update on the influence of natural climate variability and anthropogenic climate change on tropical cyclones

在线全文

学校读者我要写书评

暂无评论

Tropical Cyclone Research and Review 2023年第3期12卷 216-239页

作者： Suzana j.Camargo Hiroyuki Murakami Nadia Bloemendaal Savin S.Chand Medha S.Deshpande Christian Dominguez-Sarmiento juan jesús Gonz´alez-Alem´an Thomas R.Knutson I.-I.Lin Il-ju Moon Christina M.Patricola Kevin A.Reed Malcolm j.Roberts Enrico Scoccimarro Chi Yung(francis)Tam Elizabeth j.Wallace Liguang Wu Yohei Yamada Wei Zhang Haikun Zhao Lamont-Doherty Earth observatory Columbia UniversityPalisadesNYUSA National oceanographic and Atmospheric Administration/Geophysical Fluid Dynamics Laboratory PrincetonNJUSA University Corporation for Atmospheric Research BoulderCOUSA Vrije University Amsterdam AmsterdamNetherlands Federation University Australia BallaratVictoriaAustralia Indian Institute of Tropical Meteorology Ministry of Earth SciencesPuneIndia Instituto de Ciencias de la Atmosfera y Cambio Clim´atico Universidad Nacional Autonoma de Mexico(UNAM)Mexico CityMexico Spanish State Meteorological Agency(AEMet) MadridSpain National Taiwan University TaiwanChina jeju National University JejuRepublic of Korea Iowa State University AmesIAUSA Stony Brook University Stony BrookNYUSA Met office ExeterUnited Kingdom Fondazione Centro Euro-Mediterraneo sui Cambiamenti Climatici BolognaItaly The Chinese University of Hong Kong Hong KongChina old Dominion University NorfolkVAUSA Fudan University ShanghaiChina japan Agency for Marine-Earth Science and Technology YokohamaJapan Utah State University LoganUTUSA Nanjing University of Information Science and Technology NanjingChina

A substantial number of studies have been published since the Ninth International Workshop on Tropical Cyclones(IWTC-9)in 2018,improving our understanding of the effect of climate change on tropical cyclones(TCs)and associated hazards and *** studies have reinforced the robustness of increases in TC intensity and associated TC hazards and risks due to anthropogenic climate *** modeling and observational studies suggested the potential influence of anthropogenic climate forcings,including greenhouse gases and aerosols,on global and regional TC activity at the decadal and century time ***,there are still substantial uncertainties owing to model uncertainty in simulating historical TC decadal variability in the Atlantic,and the limitations of observed TC *** projected future change in the global number of TCs has become more uncertain since IWTC-9 due to projected increases in TC frequency by a few climate models.A new paradigm,TC seeds,has been proposed,and there is currently a debate on whether seeds can help explain the physical mechanism behind the projected changes in global TC *** studies also highlighted the importance of large-scale environmental fields on TC activity,such as snow cover and air-sea *** projections on TC translation speed and medicanes are new additional focus topics in our *** and future research are proposed relevant to the remaining scientific questions and assisting policymakers.

关键词： tropical climate variability