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This all-sky catalogue of unambiguous rotation measure (from a Faraday-thin, one-component, spectrum selection) for 674 galaxies or quasars has been compiled, ordered, and edited from the available literature. All the known applications of the RM distribution toward foreground objects in the Galaxy (i.e., magnetic field in 4 nearby spiral arms and in 4 nearby interstellar magnetic bubbles) have also been catalogued. 相似文献
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Observations of OCS and a search for OC3S are reported, with particular reference to cold dust clouds. OCS has been detected for the first time in dark clouds with a mean fractional abundance relative to hydrogen of approximately 3 x 10(-9); this is approximately 4 times greater than that observed for giant molecular clouds. This results is discussed in the context of molecule formation mechanisms. Observations of the J = 1 --> 0 transition of OCS indicate that this transition is amplifying the background continuum radiation in the direction of Sgr B2. 相似文献
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Erik O. D. Sevre Monica D. Christiansen Matt Broten Shuo M. Wang David A. Yuen 《Visual Geosciences》2008,13(1):125-132
The Sony PlayStation 3 (PS3) offers the computational power of a parallel processor at low cost, which makes it a great starter
unit for development in parallel programming. To explore the capabilities of the unit, we took a simple ray tracing program
and extended it to render triangulated height field data across the PS3’s 6 synergistic processing units (SPUs). We also implemented
the heat averaging equation as a precursor to CFD analysis on the PS3. In our studies, we found the Cell engine in the PS3
to be a powerful machine, however great care must be taken while developing because its unique platform calls for many levels
of optimization to ensure efficiency.
For insight on early work done on modern stream computing and GPU processing look up the Merrimac project and Pat Hanrahan. 相似文献
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The measured effective black-body temperature at the lunar equator is 220 °K, with an estimated probable error of 5 per cent. No variation with lunar phase was detected; if present, and obscured by the random scatter of the observations, it is less than 5 per cent at this frequency. 相似文献
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Broten NW MacLeod JM Avery LW Irvine WM Hoglund B Friberg P Hjalmarson A 《The Astrophysical journal》1984,(1):L25-L29
A new interstellar molecule, methylcyanoacetylene (CH3C3N), has been detected in the molecular cloud TMC-1. The J = 8 --> 7, J = 7 --> 6, J = 6 --> 5, and J = 5 --> 4 transitions have been observed. For the first three of these, both the K = 0 and K = 1 components are present, while for J = 5 --> 4, only the K = 0 line has been detected. The observed frequencies were calculated by assuming a value of radial velocity VLSR = 5.8 km s-1 for TMC-1, typical of other molecules in the cloud. All observed frequencies are within 10 kHz of the calculated frequencies, which are based on the 1982 laboratory constants of Moises et al., so the identification is secure. The lines are broadened by hyperfine splitting, and the J = 5 --> 4, K = 0 transition shows incipient resolution into three hyperfine components. The rotational temperature determined for these observations is quite low, with 2.7 K < or = Trot < or = 4 K. the total column density is approximately 5 x 10(12) cm-2. 相似文献
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北美内陆西部白垩纪脊椎动物生物年代学 总被引：1，自引：1，他引：0
北美西部内陆白垩纪的脊椎动物生物年代学的研究始于19世纪90年代。前人建议的期,即陆生脊椎动物"期"或陆生哺乳动物"期"名已过十二个,但其中具有精确的定义者甚少,仅有少量的建议受到广泛认可和使用。本文定义或重新定义了10个陆生脊椎动物"期",包括了西部内陆从最老至最新的全部白垩纪—Comobluffian期(～提塘期至欧特里沃期)、Buffalogapian期(～巴列姆期至早阿普特期)、Cashenranchian期(～早阿普特期至晚阿尔布期)、Mussentuchian期(～晚阿尔布期至塞诺曼期)、Fencelakean期(土伦期至晚塞农期)、Aquilan期(～晚塞农期至早坎潘期)、Judithian期(～中坎潘期)、Kirtlandian期(～晚坎潘期)、Edmontonian期(～坎潘期末期至早马斯特里赫特期)以及Lancian期(～早马斯特里赫特期晚期)。每一个"期"的开始由一种恐龙或哺乳动物种类的首现来定义,而其结束由后续的"期"的开始来定义。这样定义的脊椎动物生物年代代表了完整的白垩纪时间表。但有些时间段(尤其是Neocomian(尼欧克姆期)的大部分以及部分"中"白垩世的一部分)缺乏足够的脊椎动物化石特征。这些白垩纪陆生脊椎动物"期"构成了一个能使北美西部内陆的脊椎动物的演化历史得以序和解释年代表。 相似文献
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Abstract The often pragmatic division of studies of function (physiology), and the regulation of distribution and abundance of organisms (ecology), as laboratory and field studies respectively, can create an unhelpful intellectual division that runs the risk of ignoring the interaction of physiology, behaviour and environment that regulates the lives of animals in the wild. This review examines the historical and current contribution of ecophysiological research conducted from the University of Auckland's Leigh Laboratory in bridging these paradigms, and generating new insights into animal function and community organisation. The assessment focuses on endocrine control processes, and metabolic and behavioural responses of fish to artificial and natural stressors, and examines tracks of future research needed to underpin understanding of likely effects of predicted environmental change on individuals and populations. 相似文献
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