等性块段指数法的应用与推广     

李同生 《湖南地质》1990,(2)

等性块段指数法是中国地质大学(武汉)詹才高等于1985年创立的,用构造指数和煤层指数定量划分井田勘探类型。本文阐述等性块段指数法的计算方法;较划分煤田勘探类型的其它方法,具有突出的优点及实际应用效果。并提出在我省煤田地质勘探中推广应用的建议。  相似文献   

The Solar Oscillations Investigation - Michelson Doppler Imager     

P. H. Scherrer  R. S. Bogart  R. I. Bush  J. T. Hoeksema  A. G. Kosovichev  J. Schou  W. Rosenberg  L. Springer  T. D. Tarbell  A. Title  C. J. Wolfson  I. Zayer  The MDI Engineering Team 《Solar physics》1995,162(1-2):129-188

The Solar Oscillations Investigation (SOI) uses the Michelson Doppler Imager (MDI) instrument to probe the interior of the Sun by measuring the photospheric manifestations of solar oscillations. Characteristics of the modes reveal the static and dynamic properties of the convection zone and core. Knowledge of these properties will improve our understanding of the solar cycle and of stellar evolution. Other photospheric observations will contribute to our knowledge of the solar magnetic field and surface motions. The investigation consists of coordinated efforts by several teams pursuing specific scientific objectives.The instrument images the Sun on a 1024² CCD camera through a series of increasingly narrow spectral filters. The final elements, a pair of tunable Michelson interferometers, enable MDI to record filtergrams with a FWHM bandwidth of 94 m. Normally 20 images centered at 5 wavelengths near the Ni I 6768 spectral line are recorded each minute. MDI calculates velocity and continuum intensity from the filtergrams with a resolution of 4 over the whole disk. An extensive calibration program has verified the end-to-end performance of the instrument.To provide continuous observations of the longest-lived modes that reveal the internal structure of the Sun, a carefully-selected set of spatial averages are computed and downlinked at all times. About half the time MDI will also be able to downlink complete velocity and intensity images each minute. This high rate telemetry (HRT) coverage is available for at least a continuous 60-day interval each year and for 8 hours each day during the rest of the year. During the 8-hour HRT intervals, 10 of the exposures each minute can be programmed for other observations, such as measurements in MDI's higher resolution (1.25) field centered about 160 north of the equator; meanwhile, the continuous structure program proceeds during the other half minute. Several times each day, polarizers will be inserted to measure the line-of-sight magnetic field.MDI operations will be scheduled well in advance and will vary only during the daily 8-hour campaigns. Quick-look and summary data, including magnetograms, will be processed immediately. Most high-rate data will be delivered only by mail to the SOI Science Support Center (SSSC) at Stanford, where a processing pipeline will produce 3 Terabytes of calibrated data products each year. These data products will be analyzed using the SSSC and the distributed resources of the co-investigators. The data will be available for collaborative investigations.The MDI Engineering Team leaders include: D. Akin, B. Carvalho, R. Chevalier, D. Duncan, C. Edwards, N. Katz, M. Levay, R. Lindgren, D. Mathur, S. Morrison, T. Pope, R. Rehse, and D. Torgerson.  相似文献   

高度计资料监测日本以南黑潮主轴特性的变化   总被引：3，自引：0，他引：3  

王海龙  郭佩芳  钱成春  韩树宗 《热带海洋学报》2003,22(4):84-92

应用1993年至2001年TOPEX／Poseidon(以下简写为T／P)卫星高度计3条下行轨道的沿轨资料，计算分析了日本以南黑潮主轴的摆动特性，发现在1993年和2000—2001年010轨道上有2次空间尺度较大、持续时间较长的弯曲。黑潮处于平直路径时流速比较大；呈稳定弯曲状态时流速与多年平均值相差不大；而黑潮在两种稳态之间转换时，伴随着流速负距平的出现。  相似文献   

南海海面温度的年际模态及其与季风强迫的关系   总被引：1，自引：0，他引：1  

朱秀华  王卫强  周伟东  王东晓  谢强 《热带海洋学报》2003,22(4):42-50

通过对COADS和OISST海洋气象资料的分析，以南海的海面温度异常(SSTA)为指示因子，在研究年际尺度上的南海与大尺度ENSO关系的基础上，进一步探讨了季风强迫下Ekman抽吸对SSTA年际变化的贡献。研究发现，南海SSTA滞后5个月时与：Nifio 3的SSTA相关系数最大，且其年际变化依方差贡献大小，分别有42．7月、25．6月及36．6个月的周期，这3个年际模态基本上能够描述海面温度的年际变异，为南海在大尺度ENSO背景下存在区域响应提供了重要的证据；应用Krause—Turner混合层温度方程对南海异常暖事件的研究表明，除了经向风应力异常，Ekman抽吸也是影响SSTA年际变异的主要因素，在某些异常年份甚至是主导因素，为南海SSTA年际变化的研究提供了重要的补充。  相似文献   

Safety Level and Reliability Index for Bank Slope Stability     

Mai Yuanjian Senior Engineer  the th Harbour Engineering Bureau  The Ministry of Communications of P. R. China  Guangzhou 《中国海洋工程》1997,(2)

Based on statistics and analysis of the safety factor of unstable bank slopes,the relation be-tween safety level and reliability index of stability is studied and discussed,and then the elementary cali-brating calculation is carried out to the levels of safety and reliability for bank slope stability in the rangeof safety factors stipulated in existing China Technical Specifications for Port Engineering—FoundationPart(1987)and to those reached by some stable bank slopes already built.The results show that the relia-bility index β in the effective stress method is able to reach a high value of 2.4～4.1(mid-value 3.25),while the value of β in other three kinds of total stress method can just reach a lower value of 0.5～2.8(mid-value 1.65),which are in conformity with the engineering experience in China,and thus acceptable.Some suggestions are also given in this paper to the adoption of the value of β_0—objective reliability indexfor bank slope stability.  相似文献   

The Biology of the Spotted Seatrout Stephen A. Bortone (Ed.), Published by CRC Press, Boca Raton, Florida, 312 pp., ISBN 0849311292, £99.     

The Biology of the Spotted Seatrout 《Estuarine, Coastal and Shelf Science》2005,63(4):704-705

  相似文献   

The New Form of Time-Dependent Mild Slope Equation for Random Waves     

Zhang Yonggang  Li Yucheng Teng Bin Doctor Degree Candidate  The National Key Laboratory of Coastal  Offshore Engineering  Dalian University of Technology  Dalian Professor  The National  Key Laboratory of Coastal  Offshore Engineering  Dalian University of Technology  Dalian Associate Professor  The National Key Laboratory of Coastal  Offshore Engineering  Dalian University of Technology  Dalian 《中国海洋工程》1995,(4)

The mild-slope equation derived by Berkhoff (1972), has widely been used in the numerical calculation of refraction and diffraction of regular waves. However, it is well known that the random sea waves has a significant effect in the refraction and diffraction problems. In this paper, a new form of time-dependent mild slope equation for irregular waves was derived with Fade approximation and Kubo's time series concept. The equation was simplified using WKB method, and simple and practical irregular mild slope equation was obtained. Results of numerical calculations are compared with those of laboratory experiments.  相似文献   

Sequences Characterization of Microsatellite DNA Sequences in Pacific Abalone(Haliotis discus hannai)   总被引：1，自引：0，他引：1  

Kijima Akihiro 《中国海洋大学学报(英文版)》2007,(1)

1 Introduction Microsatellites or simple sequence repeats (SSRs) are tandemly repeated motifs of one to six bases found in all prokaryotic and eukaryotic genomes analysed to date (Zane et al., 2002). Due to their hyper-variable and co-dominant nature, relatively high abundance and random distribution in the genome, microsatellites are among the most efficient class of molecular markers. Such repeats display high polymorphism because of variation in repeat length and can be rapidly analysed t…  相似文献   

Albedo control of seasonal South Polar cap recession on Mars     

Frédéric Schmidt  Sylvain Douté  Bernard Schmitt  Mathieu Vincendon  Jean-Pierre Bibring  Yves Langevin  The OMEGA Team 《Icarus》2009,200(2):374-394

Over the last few decades, General Circulation Models (GCM) have been used to simulate the current martian climate. The calibration of these GCMs with the current seasonal cycle is a crucial step in understanding the climate history of Mars. One of the main climatic signals currently used to validate GCMs is the annual atmospheric pressure cycle. It is difficult to use changes in seasonal deposits on the surface of Mars to calibrate the GCMs given the spectral ambiguities between CO₂ and H₂O ice in the visible range. With the OMEGA imaging spectrometer covering the near infra-red range, it is now possible to monitor both types of ice at a spatial resolution of about 1 km. At global scale, we determine the change with time of the Seasonal South Polar Cap (SSPC) crocus line, defining the edge of CO₂ deposits. This crocus line is not symmetric around the geographic South Pole. At local scale, we introduce the snowdrop distance, describing the local structure of the SSPC edge. Crocus line and snowdrop distance changes can now be used to calibrate GCMs. The albedo of the seasonal deposits is usually assumed to be a uniform and constant parameter of the GCMs. In this study, albedo is found to be the main parameter controlling the SSPC recession at both global and local scale. Using a defrost mass balance model (referred to as D-frost) that incorporates the effect of shadowing induced by topography, we show that the global SSPC asymmetry in the crocus line is controlled by albedo variations. At local scale, we show that the snowdrop distance is correlated with the albedo variability. Further GCM improvements should take into account these two results. We propose several possibilities for the origin of the asymmetric albedo control. The next step will be to identify and model the physical processes that create the albedo differences.  相似文献   

第十四批天文学名词的推荐译名     

中国天文学会天文学名词审定委员会 《天文学进展》2007,25(1):96-99

中国天文学会名词审定委员会从1985年起开始在《天文学进展》发表天文学名词的推荐译名,到2006年已公布了13批共2151个名词。现再推荐第14批129个名词,其中大多数是近年出现的天文学新词,希望读者在使用过程中对译名提出改进意见．  相似文献