THE MEASUREMENT AND COMPARISON OF TOOTH SHAPE USING PHOTOGRAMMETRY     

C. E. Clark  R. M. Flinn  K. B. Atkinson  E. H. Wickens 《The Photogrammetric Record》1974,8(44):217-221

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SOME RECENT DEVELOPMENTS IN NON-TOPOGRAPHIC PHOTOGRAMMETRY     

K. B. Atkinson 《The Photogrammetric Record》1969,6(34):357-378

Equipment manufactured in connexion with the special applications of photogrammetry has developed from very early designs, often with remarkably few changes. The first section of the paper traces this evolution up to the present time. Architectural photogrammetry has been, since Meydenbauer, one of the most important of these special applications and the second part describes some recent work of this type in England and Jordan.  相似文献   

Observations of upwelling around the Izu Peninsula,Japan: May 1982     

Larry P. Atkinson  Jackson O. Blanton  Charles McClain  Thomas N. Lee  Masayuki Takahashi  Takashi Ishimaru  Joji Ishizaka 《Journal of Oceanography》1987,43(2):89-103

Hydrographic observations between the Izu Peninsula and Oshima Island, Japan, in May 1982, showed upwelling around the tip of the Peninsula and possibly also in the lee of Oshima Island. The upwelling introduced water as cold as 18 C with nitrate concentrations of 3M to the surface. Temperature/salinity analyses indicated that the upwelled water was of Kuroshio characteristics. Slightly fresher water was advected out of Sagami Bay in a coastal counter current.Contribution number 470 from the Shimoda Marine Research Center, University of Tsukuba.  相似文献   

Spatial variability of factors influencing coastal change in the Western Canadian Arctic     

G. K. Manson  S. M. Solomon  D. L. Forbes  D. E. Atkinson  M. Craymer 《Geo-Marine Letters》2005,25(2-3):138-145

Coastal change in the western Canadian Arctic is influenced by coastal morphology, relative sea-level trend and sea-ice and storm climates. The spatial variability of these factors tends to follow general east–west trends suggesting similar trends in coastal erosion hazard, processes and rates of coastal change. The spatial variability in the causes of coastal change is examined in the communities of Tuktoyaktuk, Sachs Harbour, Holman and Kugluktuk.  相似文献   

Underwater television as a fishery-independent method for stock assessment of Norway lobster (Nephrops norvegicus) in the central Adriatic Sea (Italy)     

Morello  Elisabetta B.; Froglia  Carlo; Atkinson  R. J. A. 《ICES Journal of Marine Science》2007,64(6):1116-1123

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Reactions of alkoxy radicals under atmospheric conditions: The relative importance of decomposition versus reaction with O2     

Roger Atkinson  William P. L. Carter 《Journal of Atmospheric Chemistry》1991,13(2):195-210

The reactions of alkoxy radicals determine to a large extent the products formed during the atmospheric degradations of emitted organic compounds. Experimental data concerning the decompositions, 1,5-H shift isomerizations and reactions with O₂ of several classes of alkoxy radicals are inconsistent with literature estimations of their absolute or relative rate constants. An alternative, although empirical, method for assessing the relative importance under atmospheric conditions of the reactions of alkoxy radicals with O₂ versus decomposition was derived. This estimation method utilizes the differences in the heats of reaction, (H)=(H_{decomposition}–H_{O 2 reaction}), between these two reactions pathways. For (H)[22–0.5(H_{O 2 reaction})], alkoxy radical decomposition dominates over the reaction with O₂ at room temperature and atmospheric pressure of air, while for (H)[25-0.5(H_{O 2 reaction})], the O₂ reaction dominates over decomposition (where the units of H are in kcal mol^–1). The utility and shortcomings of this approach are discussed. It is concluded that further studies concerning the reactions of alkoxy radicals are needed.  相似文献   

A re-appraisal of the total biomass and annual production of Antarctic krill     

A. Atkinson  V. Siegel  E.A. Pakhomov  M.J. Jessopp  V. Loeb 《Deep Sea Research Part I: Oceanographic Research Papers》2009,56(5):727-740

Despite much research on Euphausia superba, estimates of their total biomass and production are still very uncertain. Recently, circumpolar krill databases, combined with growth models and revisions in acoustics have made it possible to refine previous estimates. Net-based databases of density and length frequency (KRILLBASE) yield a summer distributional range of ～19×10⁶ km² and a mean total abundance of 8×10¹⁴ post-larvae with biomass of 379 million tonnes (Mt). These values are based on a standardised net sampling method but they average over the period 1926–2004, during which krill abundance has fluctuated. To estimate krill biomass at the end of last century we combined the KRILLBASE map of relative krill density around Antarctica with an acoustics-derived biomass estimate of 37.3 Mt derived for the Scotia Sea area in 2000 by the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR). Thus the CCAMLR 2000 survey area contains 28% of the total stock, with total biomass of ～133 Mt in January–February 2000. Gross postlarval production is estimated conservatively at 342–536 Mt yr^?1, based on three independent methods. These are high values, within the upper range of recent estimates, but consistent with the concept of high energy throughput for a species of this size. The similarity between the three production estimates reflects a broad agreement between the three growth models used, plus the fact that, for a given population size, production is relatively insensitive to the size distribution of krill at the start of the growth season. These production values lie within the envelope of what can be supported from the Southern Ocean primary production system and what is required to support an estimated predator consumption of 128–470 Mt yr^?1. Given the range of recent acoustics estimates, plus the need for precautionary management of the developing krill fishery, our net-based data provide an alternative estimate of total krill biomass.  相似文献   

青海锡铁山铅锌矿床硫同位素地球化学研究——深源与海水硫的混合   总被引：5，自引：0，他引：5  

祝新友  王莉娟  朱谷昌  邓吉牛  樊俊昌 《岩石学报》2010,26(3):657-666

锡铁山铅锌矿床发育较为完整的喷流沉积系统,包括管道相、近喷口相、远端沉积相及各种喷流沉积岩,并有后期改造作用形成的脉状铅锌矿体。本文通过喷流沉积系统各部位硫化物硫同位素的分析,不同部位硫化物硫同位素组成不同,且规律性变化。以黄铁矿分析结果为例,网脉状石英钠长岩δ34S=+0.8‰,代表供给系统的硫化物脉2.95‰,非层状矿体4.48‰,层状矿体3.25‰,炭质片岩为+6.26‰,后期改造型铅锌矿脉为+2.93‰。代表管道相的网脉状石英钠长岩黄铁矿具有深源(幔源)的硫同位素组成,而矿体或大理岩上盘炭质片岩具有海水硫来源的特点。矿体的硫介于二者之间,更靠近炭质片岩的硫化物同位素组成,其来源可能更多受海水硫酸盐的制约,即锡铁山矿床硫具有混合来源性质,主要是海水硫酸盐的还原,部分来源于深部卤水的供给。硫的还原方式以生物细菌还原为主。层状矿体中硫同位素组成由早至晚δ34S逐渐降低,表明层状矿体成矿作用过程中,发生了生物成因的H2S的大量加入。  相似文献   

Penetrometry of granular and moist planetary surface materials: Application to the Huygens landing site on Titan     

Karl R. Atkinson  John C. Zarnecki  Martin C. Towner  Timothy J. Ringrose  Axel Hagermann  Andrew J. Ball  Mark R. Leese  Gunter Kargl  Mark D. Paton  Ralph D. Lorenz  Simon F. Green 《Icarus》2010,210(2):843-851

The Huygens probe landed on the then unknown surface of Titan in January 2005. A small, protruding penetrometer, part of the Surface Science Package (SSP), was pushed into the surface material measuring the mechanical resistance of the ground as the probe impacted the landing site. We present laboratory penetrometry into room temperature surface analogue materials using a replica penetrometer to investigate further the nature of Titan’s surface and examine the sensor’s capabilities. The results are then compared to the flight instrument’s signature and suggest the Titan surface substrate material consists of sand-sized particles with a mean grain size ～2 mm. A possible thin 7 mm coating with mechanical properties similar to terrestrial snow may overlie this substrate, although due to the limited data we are unable to detect any further layering or grading within the near-surface material. The unusual weakening with depth of the signature returned from Titan has, to date, only been reproduced using a damp sand target that becomes progressively wetter with depth, and supports the suggestion that the surface may consist of a damp and cohesive material with interstitial liquid contained between its grains. Comparison with terrestrial analogues highlights the unusual nature of the landing site material.  相似文献   

A BIOGRAPHICAL TRIBUTE TO PROFESSOR E. H. THOMPSON     

K. B. Atkinson  † 《The Photogrammetric Record》1977,9(50):193-211

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