简评VAN地震预报方法     

Tsel.  GA 高伟 《世界地震译丛》1997,(2):58-60

评估一种地震预报方法预报准确与否的标准，不应仅仅依赖于应用抽象而严格的统计定律的方法，而忽视的地震现象的具体特点。断层破裂过程与掷股子不能相拼并论的。本文的结论是如何我们采用Ｍｕｌａｒｇｉａ，Ｇａｓｐｅｒｉｎｉ（１９９２）在评估ＶＡＮ方法时所提出的方法，那么，即使是一种理想的地震方法，也会在前兆和震间表现出某种“不确定”的联系，每次ＶＡＮ预报需单独评估，同时必须考虑所有具体情况和信息，震中位置预报  相似文献   

边界层扩散问题的相似理论与经验推导     

Ethr.  GA  杨建忠 《山西气象》1989,(1):42-48

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GPS在尼日利亚基本测量控制网中的应用     

Oyen.  GA 段贻民 《测绘译丛》1993,(1):11-16,10

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Comparison of velocity-log data collected using impeller and electromagnetic flowmeters     

Newhouse MW  Izbicki JA  Smith GA 《Ground water》2005,43(3):434-438

Previous studies have used flowmeters in environments that are within the expectations of their published ranges. Electromagnetic flowmeters have a published range from 0.1 to 79.0 m/min, and impeller flowmeters have a published range from 1.2 to 61.0 m/min. Velocity-log data collected in five long-screened production wells in the Pleasant Valley area of southern California showed that (1) electromagnetic flowmeter results were comparable within +/-2% to results obtained using an impeller flowmeter for comparable depths; (2) the measured velocities from the electromagnetic flowmeter were up to 36% greater than the published maximum range; and (3) both data sets, collected without the use of centralizers or flow diverters, produced comparable and interpretable results. Although either method is acceptable for measuring wellbore velocities and the distribution of flow, the electromagnetic flowmeter enables collection of data over a now greater range of flows. In addition, changes in fluid temperature and fluid resistivity, collected as part of the electromagnetic flowmeter log, are useful in the identification of flow and hydrogeologic interpretation.  相似文献   

The Spectroscopic Orbit of the Planetary Companion Transiting HD 209458     

Mazeh T  Naef D  Torres G  Latham DW  Mayor M  Beuzit JL  Brown TM  Buchhave L  Burnet M  Carney BW  Charbonneau D  Drukier GA  Laird JB  Pepe F  Perrier C  Queloz D  Santos NC  Sivan JP  Udry S  Zucker S 《The Astrophysical journal》2000,536(1):L55-L58

Three new silicon-bearing radicals of astrophysical interest, SiCCH and the two nearly isoenergetic isomers SiCN and SiNC, were detected in a laboratory discharge in their X2Pi ground states by Fourier transform microwave and millimeter-wave absorption spectroscopy. Hyperfine structure was observed in the low rotational transitions of the (2)Pi(1/2) ladder, and well-resolved Lambda-doubling was observed in both fine-structure ladders. With the spectroscopic constants derived from the laboratory measurements, the spectra of all three can be calculated to an uncertainty of less than 0.1 km s(-1) in equivalent radial velocity over the entire range of interest to radio astronomers. SiCN, with a dipole moment of 2.9 D, is probably the most promising of the three for astronomical discovery.  相似文献   

Thermal treatment as a method to control transfers of invasive biofouling species via vessel sea chests     

Piola RF  Hopkins GA 《Marine pollution bulletin》2012,64(8):1620-1630

This study examined the efficacy of heated seawater for the treatment and remediation of fouled vessel sea chest habitats. In laboratory trials, three temperature regimes (37.5°C for 60 min, 40°C for 30min and 42.5°C for 20 min) were tested on a range of temperate taxa commonly found in sea chests. Field validation trials further assessed the efficacy of heat treatment within a replica sea chest environment. During laboratory trials, 100% mortality was achieved across all three treatments for the majority of taxa; the exceptions being the barnacle Elminius modestus and the oyster Crassostrea gigas. Temperature tolerance limits observed in the laboratory were successfully replicated under simulated sea chest conditions; however, a failure to achieve even heat distribution was an obstacle to achieving uniform mortality. This study provides guidance on the temperature/exposure parameters required for vessels plying temperate latitudes, and demonstrates that heated seawater has potential for controlling biofouling in vessel sea chests.  相似文献   

地球内核的旋转和磁性     

Glat.  GA 高玉芬 《世界地震译丛》1999,(1):62-66

地球发电机三维数值模拟说明,地球固内核相对于地幔的超（速）旋转是由内核和液体外核内的东向热风之间的耦合来维持的。这种机制类似于同步电动机的机制,在地球磁场的产生中也起着重要作用。  相似文献   

评《大陆下地壳》     

豪.  GA 梁慧云 《地震科技情报》1994,(8):36-38

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科威特沙漠风成沉积物与气侯,土壤和植被的关系     

AL－N.  GA  周纪侠 《世界沙漠研究》1989,(2):8-13

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New approaches to the study of population dynamics in cities of Moscow Oblast     

Gornostayeva GA  Petrov PV 《Soviet geography》1990,29(1):66-77

New approaches to the study of population growth, spatial distribution, and urbanization in the USSR are presented. "Quantitative analysis of historical trends in city growth rates within Moscow Oblast (1926-1984) reveals two major components or city types: a group of cities with below-(oblast) average rates for each of five periods of analysis (1926-39, 1939-59, 1959-70, 1970-79, 1979-84) and a second category experiencing above-average growth until 1970, with subsequent reduction of rates below the oblast average."  相似文献