Effect of water temperature on catchability of Atlantic cod (Gadus morhua) to the bottom-trawl survey in the southern Gulf of St Lawrence     

Swain  D. P.; Poirier  G. A.; Sinclair  A. F. 《ICES Journal of Marine Science》2000,57(1):56-68

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Time-varying transformations for Hill–Clohessy–Wiltshire solutions in elliptic orbits     

Ryan E. Sherrill  Andrew J. Sinclair  S. C. Sinha  T. Alan Lovell 《Celestial Mechanics and Dynamical Astronomy》2014,119(1):55-73

The relative motion of chief and deputy satellites in close proximity with orbits of arbitrary eccentricity can be approximated by linearized time-periodic equations of motion. The linear time-invariant Hill–Clohessy–Wiltshire equations are typically derived from these equations by assuming the chief satellite is in a circular orbit. Two Lyapunov–Floquet transformations and an integral-preserving transformation are here presented which relate the linearized time-varying equations of relative motion to the Hill–Clohessy–Wiltshire equations in a one-to-one manner through time-varying coordinate transformations. These transformations allow the Hill–Clohessy–Wiltshire equations to describe the linearized relative motion for elliptic chief satellites.  相似文献   

Report of the IAU/IAG/COSPAR working group on cartographic coordinates and rotational elements of the planets and satellites: 1991   总被引：1，自引：1，他引：0  

M. E. Dames  V. K. Abalakin  A. Brahic  M. Bursa  B. H. CHovitz  J. H. Lieske  P. K. Seidelmann  A. T. Sinclair  Y. S. Tjuflin 《Celestial Mechanics and Dynamical Astronomy》1992,53(4):377-397

Every three years the IAU/IAG/COSPAR Working Group on Cartographic Coordinates and Rotational Elements of the Planets and Satellites revises tables giving the directions of the north poles of rotation and the prime meridians of the planets and satellites. Also presented are revised tables giving their sizes and shapes.  相似文献   

Report of the IAU/IAG/COSPAR Working Group on Cartographic Coordinates and Rotational Elements of the Planets and Satellites: 1985   总被引：1，自引：1，他引：0  

M. E. Davies  V. K. Abalakin  M. Bursa  T. Lederle  J. H. Lieske  R. H. Rapp  P. K. Seidelman  A. T. Sinclair  V. G. Teifel  Y. S. Tjuflin 《Celestial Mechanics and Dynamical Astronomy》1986,39(1):103-113

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Regional divisions     

Robert Sinclair Secretary‐Treasurer  David Simonett Chairman  George M. Howe Secretary  Robert B. McNee Secretary 《The Professional geographer》2013,65(1):29-31

A geographic perspective is utilized to test the hypothesis that the legal labels homicide and assault represent essentially similar behaviors. The data base describes some 1200 homicide and 32 000 serious assault victimizations in Dallas, TX, for 1981–85. Detailed comparisons across urban neighborhoods (differentiated by socioeconomic status) examine the demographic, temporal, locational, and weapons characteristics of both types of serious violence. The analysis indicates strong congruence between the offenses with respect to most attributes, implying that violence data should be classified differently for behavioral analyses.  相似文献   

Basin Research at Twenty     

Hugh Sinclair 《Basin Research》2008,20(1):1-2

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The Potential for Environmentally Sound Development of Marine Deposits of Potassic and Phosphatic Minerals Offshore,Southern Africa     

S. K. P. Coles  C. I. Wright  D. A. Sinclair  P. Van den Bossche 《Marine Georesources & Geotechnology》2013,31(2):87-110

Extensive potassium and phosphorous-rich mineralization occurs on the outer continental shelf of the southern and west coasts of South Africa and Nambia. This article reviews the potential of exploiting these deposits in an environmentally sound manner for the manufacture of fertilizer. At present, reserves of potash and phosphate fertilizer are exploited from terresterial deposits, the majority being surface mined. The use of fertilizer in South Africa has shown no growth in the past 13 years, and, in some years, usage has even declined. On average, over the last decade, South Africa has consumed 2 million Mt of fertilizer (including nitrogen) per annum, the vast majority of phosphate fertilizer being produced by FOSKOR from the Phalaborwa Igneous Complex. Potash fertilizer is imported into South Africa. Although fertilizer consumption is expected to decrease in the short-term, there are good future prospects for the domestic and international fertilizer market. Considerable research into both glauconitic (containing K 2 O) and phosphatic deposits along the southern African continental shelf indicate that these sedimentary deposits have a complex genesis and mineralization. Of the total K 2 O reserves of 1300 million Mt on the southern African margin, 1000 million Mt is located off the southern African west coast, and the remainder situated on the Agulhas Bank. The largest glauconite concentration ( - 300 million Mt K 2 O) off southern Africa lies west of Saldanha Bay, South Africa. The distribution of P 2 O 5 off southern Africa is dominated by the vast deposit between Walvis Bay and Luderitz, Nambia. This reserve is estimated to contain 1000 million Mt of greater than 5% P 2 O 5 in a relatively small area of about 10000 km2. The phosphorite deposit south of Saldanha Bay constitutes a reserve of - 3500 million Mt of apatite and the deposit on the Agulhas Bank comprises 5500 million Mt. The phosphate deposit off Saldanha Bay occurs as an extensive, low to medium grade deposit. Although vast resources of potash and phosphatic minerals occur along the southern African outer continental shelf the expensive nature of marine exploitation may render most of these deposits, especially the phosphates, subeconomic. The low price of fertilizer andextensive natureontheonland deposits, although confined to asmallnumber of countries, mean that it will not be financially viable to extract these deposits. Assuming high grade glauconitic sand with the right composition can be located, the high market price indicates good future prospects for these potash deposits.  相似文献   

Increase in late Neogene denudation of the European Alps confirmed by analysis of a fission-track thermochronology database     

A.J. Vernon  P.A. van der Beek  H.D. Sinclair  M.K. Rahn 《Earth and Planetary Science Letters》2008,270(3-4):316-329

A sharp increase in deposited sediment volume since Pliocene times has been observed worldwide and in particular around the European Alps. This phenomenon has been linked to a rise in denudation rates controlled by an increase of either climatic or tectonic forcing. Observation of in-situ cooling histories for orogens is critical to assess the reality of the inferred increase in denudation rates, and to determine whether this phenomenon is widespread or localized at active tectonic structures. We exploit the unique density of fission-track ages in the Western European Alps to reconstruct cooling isoage surfaces and to estimate exhumation rates on the orogen scale between 13.5 and 2.5 Ma. Our novel technique is based on the association of isoage contours with age–elevation relationships. It uses map-view interpolation, enabling a spatio-temporal analysis of exhumation rates over the entire Western Alps. The resulting exhumation histories reconstructed for eight areas of the Western Alps display strong similarities in timing and rates with orogen-wide average denudation rates inferred from sediment volumes. This consistency validates the use of both techniques for the study of an orogen characterized by strong relief and high recent exhumation rates. We conclude that exhumation rates in the Western Alps have increased more than twofold since Late Miocene times. This increase may have been locally modulated by the distinct response of different tectonic units.  相似文献   

The ecology, distribution, and abundance of midwater fishes of the Subarctic Pacific gyres     

R. J. Beamish  K. D. Leask  O. A. Ivanov  A. A. Balanov  A. M. Orlov  B. Sinclair 《Progress in Oceanography》1999,43(2-4)

We describe the distribution and abundance of the midwater fish community, between 200 m and 500 m, in the North Pacific. The main area of interest was the Subarctic Pacific gyres, but we include species from the Bering Sea and the Sea of Okhotsk. There were 196 species identified in each gyre, 38 of which were common to both gyres. The most abundant species belong to the family Myctophidae and the most ecologically important myctophid probably is Stenobrachius leucopsarus. This species could have a biomass of approximately 21 million tonnes (t) in the Subarctic Pacific (including the Bering Sea and Sea of Okhotsk). S. leucopsarus is a small (about 8 cm maximum length) fish that lives up to 7 years. It is prey for a variety of other fishes, birds and mammals and may migrate into the mixing layer each evening where it feeds mainly on euphausiids and copepods.The total abundance of midwater fishes appears to be large relative to total catches of other fish in the same areas. The vertical migratory behaviour of some of the residents provides a mechanism to transfer production out of the mixing layer. The movement into the surface layer by some fishes at night indicates that dynamic changes occur in the midwater community between the day and night, and the ecosystem dynamics in the surface layer are different in the day and in the night. This behaviour and the huge biomass relative to commercial species means that the dynamics of fish communities in the Subarctic Pacific are complex and need to be studied over a 24 hour period. The large biomasses may eventually attract commercial interest, thus it is important to establish international, cooperative programs now to learn more about the dynamics of these populations and the relationships with other species.  相似文献   

The Solar Mass-Ejection Imager (SMEI) Mission     

B. V. Jackson  A. Buffington  P. P. Hick  R. C. Altrock  S. Figueroa  P. E. Holladay  J. C. Johnston  S. W. Kahler  J. B. Mozer  S. Price  R. R. Radick  R. Sagalyn  D. Sinclair  G. M. Simnett  C. J. Eyles  M. P. Cooke  S. J. Tappin  T. Kuchar  D. Mizuno  D. F. Webb  P. A. Anderson  S. L. Keil  R. E. Gold  N. R. Waltham 《Solar physics》2004,225(1):177-207

We have launched into near-Earth orbit a solar mass-ejection imager (SMEI) that is capable of measuring sunlight Thomson-scattered from heliospheric electrons from elongations to as close as 18 to greater than 90 from the Sun. SMEI is designed to observe time-varying heliospheric brightness of objects such as coronal mass ejections, co-rotating structures and shock waves. The instrument evolved from the heliospheric imaging capability demonstrated by the zodiacal light photometers of the Helios spacecraft. A near-Earth imager can provide up to three days warning of the arrival of a mass ejection from the Sun. In combination with other imaging instruments in deep space, or alone by making some simple assumptions about the outward flow of the solar wind, SMEI can provide a three-dimensional reconstruction of the surrounding heliospheric density structures.  相似文献