共查询到20条相似文献，搜索用时 218 毫秒
1.
Joseph Silk 《Astronomy& Geophysics》2007,48(2):2.30-2.38
Joseph Silk of Oxford University presents his 2006 George Darwin Lecture on the cosmological case for dark matter and dark energy. 相似文献
2.
Ramesh Narayan 《Astronomy& Geophysics》2003,44(6):6.22-6.26
The George Darwin Lecture presented at the Royal Astronomical Society, London, 13 December 2002, by Ramesh Narayan . 相似文献
3.
Mike Edmunds 《Astronomy& Geophysics》2005,46(4):4.12-4.17
Mike Edmunds follows the trail of the elements in his George Darwin Lecture, given to the RAS on 10 December 2004. 相似文献
4.
Michael Werner 《Astronomy& Geophysics》2006,47(6):6.11-6.16
In his George Darwin Lecture, Michael Werner celebrates the achievements of the Spitzer Space Telescope, an observatory that owes much of its success to the fact that it is cool by design. 相似文献
5.
《Astronomy& Geophysics》2009,50(2):2.20-2.27
In the 2008 George Darwin Lecture of the Royal Astronomical Society, Alan Watson describes how the Pierre Auger Observatory detects and decodes the very highest energy cosmic rays and what this tells us about their mysterious origins. 相似文献
6.
Jonathan Shanklin 《Astronomy& Geophysics》2003,44(5):5.31-5.32
There are many areas in which professional and amateur co-operation brings benefits to both. Speakers at the RAS-BAA Pro-am discussion meeting on 10 May explored observational work on some of the debris in the solar system. The meeting concluded with a lecture given in memory of the noted amateur astronomer George Alcock. Jonathan Shanklin reports. 相似文献
7.
W. Gentner T. Kirsten D. Storzer G.A. Wagner 《Earth and Planetary Science Letters》1973,20(2):204-210
Darwin Glasses from the recently discovered Darwin Crater in Tasmania were dated by the K-Ar and the fission track methods. The ages by both methods agree and yield a combined age of 0.73 ± 0.04 my for the formation of Darwin Crater and Darwin Glass by an impact. Since an accidental coincidence of this age with the age of Australasian tektites is rather unlikely, we suppose that Darwin Crater is one of many — primary or secondary — impact structures caused by the collision of a meteorite or comet with the earth ～ 0.7 my ago in the region of South East Asia and Australia. 相似文献
8.
Michael Kendall and George Helffrich respond to Alan Douglas's paper in the previous issue of Astronomy & Geophysics with a prototype three-component broadband seismic network for the UK.
There are two boundaries in the Earth's deep interior that are as significant in terms of contrast in material properties and dynamics as the lithosphere–atmosphere boundary, where we live. The natures of the core-mantle boundary and the inner-core/outer-core boundary have significant implications for the stability of the Earth's magnetic field, style of convection, moment of inertia and length of day. An array of broadband three-component seismometers (SPICeD) spanning Scotland, England and France has been deployed with the aim of studying these dramatic interfaces within the Earth. A secondary aim of the deployment was to install a working prototype for a permanent three-component broadband seismic network in the UK, as advocated by Alan Douglas in the previous issue of this journal (Douglas 2001). 相似文献
There are two boundaries in the Earth's deep interior that are as significant in terms of contrast in material properties and dynamics as the lithosphere–atmosphere boundary, where we live. The natures of the core-mantle boundary and the inner-core/outer-core boundary have significant implications for the stability of the Earth's magnetic field, style of convection, moment of inertia and length of day. An array of broadband three-component seismometers (SPICeD) spanning Scotland, England and France has been deployed with the aim of studying these dramatic interfaces within the Earth. A secondary aim of the deployment was to install a working prototype for a permanent three-component broadband seismic network in the UK, as advocated by Alan Douglas in the previous issue of this journal (Douglas 2001). 相似文献
9.
Banks S 《Marine pollution bulletin》2003,47(7-8):325-330
Near daily satellite monitoring of ocean colour using sea viewing wide angle of field viewing sensor (SeaWiFS) allowed the oceanic and near coastal chlorophyll-a distributions to be followed across the Galápagos Marine Reserve (GMR) from space. In the aftermath of the Jessica spill early indications suggested that, compared to the three preceding years 1998-2000, local chlorophyll concentrations over January 2001 were elevated across the Galápagos Marine Reserve [Biological Impacts of the Jessica Oil Spill on the Galápagos Environment: Preliminary Report. Charles Darwin Foundation, Puerto Ayora, Galápagos, Ecuador, 2001]. At the time of the spill the central and eastern extent of the archipelago was experiencing a spatially extensive moderate bloom event (0.5-2.5 mgm(-3) chl-a) extending over the central islands, including the source of the spill and areas of known impact such as the islands of Santa Fé, eastern Santa Cruz and Floreana directly in the advection path.Further investigation shows that chlorophyll across the affected regions of western San Cristóbal, Santa Fé, southeast Santa Cruz, eastern Floreana and eastern Isabela declined in the week directly following the spill event, yet rose in the successive month to levels analogous to preceding years. Although there may have been a localised effect of the spill upon near coast phytoplankton primary production in the short term, the observed variance in the weeks following the spill was not significant in comparison to the normal high variation between years and within the El Ni?o/Southern Oscillation signal. 相似文献
10.
地震学中的“暗物质”——“静地震”与地震预测研究的未来 总被引：11，自引：4，他引：11
正如暗物质的研究是理论物理学和宇宙学中的一个关键性问题，静地震的研究也将为地震预测研究的发展提供一个历史性的机遇。 相似文献
11.
2001年地球物理学的一些进展 总被引：3，自引：9，他引：3
简要回顾了2001年地球物理学的一些进展。指出在用地球系统科学研究整个地球的结构、演化和动力学过程中，地球物理学作为地球科学中主要提供地球内部信息和资料的学科，将成为地球系统科学研究的一个重要内容。讨论了现在的地球和空间科学研究以及环境监到等地球物理技术在反恐怖活动以及在国家军事方面的重要意义及应用。在21世纪能源危机日益严重的情况下，中国急需进行油气资源的二次创业，而天然气水合物研究是能源研究的一个新方向。 相似文献
12.
The relationship between the monsoon rainfall throughout all India, northwest India and peninsular India as well as the onset dates of the monsoon and two indices of southern oscillation (SOI), namely Isla de Pascua minus Darwin (I-D) and Tahiti minus Darwin (T-D) pressure anomaly have been studied for different periods. The study indicates that the monsoon rainfall shows a strong and significant direct relationship with SOI for the concurrent, succeeding autumn and succeeding winter seasons. The magnitude of the direct correlation coefficient for the SOI using (I-D) is enhanced over all India and peninsular India if the above seasons happen to be associated with an easterly phase of the QBO (Quasi-Biennial Oscillation) at 50 mb. The result indicates that the strength of the monsoon plays an important role in the following southern oscillation events in the Pacific Ocean. The premonsoon tendency of the SOI anomaly spring minus winter SOI shows a significant positive correlation with monsoon rainfall over all India, northwest India and peninsular India. The absolute value of the positive correlation coefficient becomes highly enhanced over all India, northwest India as well as peninsular India if the 6-month period from December to March is associated with the westerly phase of the QBO. Hence, the premonsoon SOI tendency parameter can be a useful predictor of Indian monsoon rainfall especially if it happens to be associated with the westerly QBO. Significant negative association is also found between the anomaly of monsoon onset dates and SOI of the previous spring season, the absolute value being higher for SOI (T-D) than for SOI (I-D). The negative correlation coefficient becomes enhanced if the previous springs are associated with a westerly phase of the QBO. It shows that the previous spring SOI has some predictive value for the onset date of Indian monsoon, a positive SOI followed by an early onset of monsoon, andvice versa, especially if it is associated with a westerly phase of the QBO. 相似文献
13.
Peter Coles 《Astronomy& Geophysics》2003,44(3):3.16-3.20
Peter Coles looks at the past, present and future association of astronomy and cosmology with statistical theory. 相似文献
14.
On November George C.Lee the editor-in-chief of our journal-Earthquake Engineering Engineering Vibration 《地震工程与工程振动(英文版)》2007,6(4):I0002
On November 16,2007,George C.Lee,the editor-in-chief of our journal-Earthquake Engineering and Engineering Vibration (EEEV),was among 11 people to receive a 2006 Presidential Award for Excellence in Science,Mathematics and Engineering Mentoring (PAESMEM) from President George W.Bush in a ceremony at the White House. 相似文献
15.
Sixty years after the death of Sir Arthur Eddington OM, FRS, the RAS held a Commemoration Meeting to recall his outstanding contributions to astronomy, cosmology and the popularization of science, organized by John D Barrow and Leon Mestel . 相似文献
16.
The Peter Gruber Foundation, along with the International Congress of Distinguished Awards, has instituted the world's first award devoted to cosmology, with a cash prize of $150 000.
Click HERE to view the article. 相似文献
Click HERE to view the article. 相似文献
17.
James W. Skehan 《Journal of Geodynamics》2004,37(3-5):301
Nicholas Rast died in Lexington, Kentucky on 28 August 2001, five months after his retirement as the first holder of the Hudnall Chair of Geology, Department of Geological Sciences, University of Kentucky. Born in Teheran in 1927, his early education was in Iran; his university education from 1948 was at University College London and University of Glasgow. His brilliant career as a university professor and award-winning researcher began in Aberystwyth, University of Wales, University of Liverpool, and continued in North America at the University of New Brunswick, Canada, and at the University of Kentucky, USA. Rast's published research consists of over 100 books and papers as well as abstracts in scientific journals. The abstracts represent topics which Nick Rast and his collaborators presented to participants at scientific meetings, symposia, and conferences; he was never one to let a good idea lie fallow, and I think it is accurate to say that every abstract evolved into a published paper. Wherever Nick worked he became deeply involved in influential activities of the geological societies of the country and in so doing left his imprint on the policies of these societies in England, Wales, Scotland, Ireland, Mexico, Canada and the United States. The organization of this retrospective deals generally with the chronology of Nick Rast's life and career. It includes a selection from among his most significant peer-cited reviewed publications, all of which are listed at the end of this chapter. From this list I have attempted to highlight some of the most important ideas contained in these publications. In addition I have interspersed a few colorful reminiscences by Nick's many friends, colleagues, and former students. These recalls were part of my “Rastfest” retirement banquet illustrated lecture which is now available on the Kentucky departmental website. 相似文献
18.
Nigel Weiss FRAS 《Astronomy& Geophysics》2001,42(3):3.10-3.17
Nigel Weiss recounts his Presidential Address 2001, given to the RAS A&G Ordinary Meeting on 9 February 2001.
Recent high-resolution observations, from the ground and from space, have revealed the fine structure of magnetic features at the surface of the Sun. At the same time, advances in computing power have at last made it possible to develop models of turbulent magnetoconvection that can be related to these observations. The key features of flux emergence and annihilation, as observed by the MDI experiment on SOHO, are reproduced in kinematic calculations, while three-dimensional numerical experiments reveal the dynamical processes that are involved. The pattern of convection depends on the strength of the magnetic field: as the mean field decreases, slender rising plumes give way to a regime where magnetic flux is separated from the motion and then to one where locally intense magnetic fields nestle between broad and vigorously convecting plumes. Moreover, turbulent convection is itself able to act as a small-scale dynamo, generating disordered fields near the solar surface. 相似文献
Recent high-resolution observations, from the ground and from space, have revealed the fine structure of magnetic features at the surface of the Sun. At the same time, advances in computing power have at last made it possible to develop models of turbulent magnetoconvection that can be related to these observations. The key features of flux emergence and annihilation, as observed by the MDI experiment on SOHO, are reproduced in kinematic calculations, while three-dimensional numerical experiments reveal the dynamical processes that are involved. The pattern of convection depends on the strength of the magnetic field: as the mean field decreases, slender rising plumes give way to a regime where magnetic flux is separated from the motion and then to one where locally intense magnetic fields nestle between broad and vigorously convecting plumes. Moreover, turbulent convection is itself able to act as a small-scale dynamo, generating disordered fields near the solar surface. 相似文献
19.
Valerio Faraoni 《水文研究》2004,18(9):1735-1743
By applying the technique of conformal transformation of the metric, widely used in general relativity and cosmology, the analysis of groundwater flow in an anisotropic aquifer (in which the hydraulic conductivity is a tensor) is reduced to the case of an isotropic one. This reduction is achieved for a particular conformal factor of the transformation. Examples of application of this technique are given. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
20.
《Astronomy& Geophysics》2008,49(4):4.39-4.39
Prof. Reinhard Genzel, Associate of the Society since 1994, Darwin Lecturer in 2007, and Director of the Max Planck Institute for Extraterrestrial Physics has been awarded the Shaw Prize in Astronomy for 2008. 相似文献