On a possible mechanism responsible for the differential energy spectrum of relativistic electrons and non-linear low-frequency spectra of cosmic radio sources     

S. Ya. Braude  È. A. Kaner 《Astrophysics and Space Science》1973,20(1):59-70

The paper suggests an explanation of the deviations from the power law which are observed in frequency spectra of discrete radio sources at decametric wavelengths. It has been shown that a possible mechanism of the deviations is a combined effect of the stimulated and spontaneous scattering of relativistic electrons in the turbulent plasma of a source, as well as ionization energy losses thereof. The distribution function of the relativistic electrons, empirically established in an earlier paper (Braudeet al., 1971) has been derived from the kinetic equation. For a number of discrete sources the turbulence energy density and the plasma concentration are deduced with the aid of experimental data on low-frequency radio spectra.

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Possible role of superluminous radiation under pulsar conditions     

V. Ya. Éidman 《Astrophysics》1972,8(4):359-361

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Iron Sulfides in Mudstones within the Carbonaceous Sequence of Donets Basin     

Kizilshtein  L. Ya.  Nastavkin  A. V. 《Lithology and Mineral Resources》2003,38(1):31-35

The genesis of local compact segregations of iron sulfide (pyrite) in mudstones at the roof of some coal seams in the Donets Basin (Donbas) is examined. Arguments presented in the work show that sulfides were formed as a result of bacterial sulfate reduction and hydrogen sulfide generation in zones of organic matter concentration. The lack of any signs of influx of alien components testifies to in situ sulfide accumulations at the syngenetic or early diagenetic stage in bottom sediments of the basin. The shape and structure of pyrite segregations suggest that they could be sulfide bioherms occasionally subjected to mechanical deformation in a liquid mud under the influence of gravitational force or external mechanical (possibly seismic) loads. The obtained data can serve as an additional source of information pertaining to the formation conditions of sulfide ore deposits.  相似文献   

世界性科学难题——地震预报有可能首先在中国实现突破   总被引：5，自引：0，他引：5  

李均之  陈维升  白志强  夏雅琴 《地学前缘》2003,10(1):89-91

采用多学科交叉的地震前兆观测方法 ,成功地做出了一些地震的临震预测及年度 (中期 )预测。可以预测几千km以外的 7级以上大地震。预测地震 3要素 (发震时间、震级及地点 )所达到的精度在地震史上也是罕见的。文中介绍了我们所用的主要地震前兆观测方法 :次声波、地应力、地电脉冲、大地微动、引潮力共振叠加等。文中还介绍了几次较好的临震预测及年度预测震例。从近几年的地震预测实践证明 ,对 7级以上大地震做出准确的预报是可能的。  相似文献   

两次岫岩震群的特征及其预报意义研究   总被引：3，自引：1，他引：2  

张卫东  许世昌  刘旭东  李涯  张秀梅 《东北地震研究》2002,18(1):24-30

本文对1988年1月、1999年11月岫岩两次震群的性质及序列特征作了较系统的分析和研究。结果表明：序列各项特征参数及预测指标都显示出了具有明确意义的预报信息。特别是1999年11月前震序的低b值、低h值及多台小震初动符号和波形特征的高度一致性和稳定性都预示着震源区应力的高度集中和稳定,也为短临预报提供了可靠的信息。此外,前震序列的频度分布的时间结构和能量释放的时间过程也明确显示出“密集－平静－发震”和“增强－减弱－发震”的特点。这种临震预报特征与海域地震前震活动的时空结构和时空过程十分相似。本文还讨论了两震群之间特殊部位发生断层贯通的可能性,并给出震级上限的估计。  相似文献   

柴达木盆地中、新生代构造演化及其对油气的控制   总被引：12，自引：1，他引：12  

吴光大  葛肖虹  刘永江  袁四化  巩庆林  陈言忠  沈亚 《世界地质》2006,25(4):411-417

柴达木盆地中、新生代沉积构造演化经历了5个阶段:早、中侏罗世伸展断陷阶段,晚侏罗世—白垩纪挤压反转阶段,古近纪弱断陷阶段,新近纪的中新世—上新世早期坳陷阶段和上新世晚期—全新世挤压反转阶段。沉积构造演化控制盆地烃源岩的展布,盆地演化过程中的两次挤压反转期是圈闭构造的主要形成期,控制盆地油气分布。  相似文献   

Obtaining of information about the IMF evolution from an analysis of the geomagnetic field data     

N. Ya. Maksimov 《Geomagnetism and Aeronomy》2006,46(5):635-637

A comparison of the time variations in the geomagnetic field characteristics (the u and aa indices of geomagnetic activity) with the variation in the solar magnetic dipole inclination shows close agreement between these variations. The linear correlation coefficients between the u and aa indices, the u index and solar magnetic dipole inclination, and the aa index and solar magnetic dipole inclination are 0.93, 0.45, and 0.49, respectively. This makes it possible to extend studying the IMF evolution in the 11-year cycle of solar activity to the 170-year period beginning from 1835. It has been indicated that the time variation in the heliospheric current sheet (HCS) surface deviation from the solar magnetic equator plane, calculated based on the actual HCS configuration, is in good agreement with the time variation in the amplitude of the Fourier series second harmonics in a harmonic analysis of the series of daily data on the IMF sign in the vicinity of the Earth. The linear correlation coefficient is 0.9 in this case.  相似文献   

On a homogeneous representation of seismic history in large regions     

R. E. Tatevossian  A. Ugalde  Zh. Ya. Aptekman  A. E. Petrosyan 《Izvestiya Physics of the Solid Earth》2006,42(2):124-131

The possibility to obtain a more complete and unbiased long-term history of seismic shakings over large territories than is explicitly reported from inhabited localities is discussed in the paper. An approach proposed for this purpose consists in complementing the spatial distribution of the macroseismic effect of earthquakes by calculated intensities at localities where information on felt shakings is absent. The calculated intensity is obtained on the basis of data on the epicentral intensity and location of epicenters provided by earthquake catalogs. This approach is applied to the analysis of the history of seismic shaking in Spain. The calculated intensities are shown to be comparable in accuracy with the ordinary practice of intensity determinations at national seismological centers.  相似文献   

A trigger mechanism of nonlinear mechanoelectric conversions in mineralized faults     

Z. -Yu. Ya. Maibuk 《Izvestiya Physics of the Solid Earth》2006,42(10):838-849

Polymetallic ores yield evidence of semiconductor textures creating irregularly distributed trap zones of electric charges produced by electrochemical reactions and mechanoelectric conversions. Such zones bounded by natural barriers can contain charges concentrated in separate parts of an ore-bearing province and reside in this state for a long time. If this equilibrium is disturbed, the energy (electric charges) is redistributed and signals of pulsed electromagnetic emission in the radiowave frequency range (PEERFR) are radiated. The set of properties of polymetallic ores recorded under in situ conditions and studied in the laboratory suggests a trigger mechanism of PEERFR signal generation. The triggering threshold of this mechanism depends on mining and geological conditions and the concentration and structure of ores. The energy released in ores can be many times larger than the activation energy of this process.  相似文献   

The source and aftershocks of the Altai (Chuya) earthquake of 2003     

S. S. Arefiev  Zh. Ya. Aptekman  V. V. Bykova  I. V. Matveev  A. G. Mikhin  S. G. Molotkov  K. G. Pletnev  V. V. Pogrebchenko 《Izvestiya Physics of the Solid Earth》2006,42(2):167-177

Results derived from processing of data of field observations in the epicentral zone of the Altai earthquake of 2003 are presented. Accurate location of aftershocks showed that their spatial distribution is in good agreement with the source rupture outcropping on the Earth’s surface. According to aftershock data, the source had a length of 75 km and a maximum width of 20 km and extended in the vertical direction for 17 km; the displacement in the source averaged 2.5 m. Clusters identified in the aftershock cloud define variously dipping planes. The location of hypocenters by regional, national, and global seismic networks is not accurate enough to examine spatial features of the aftershocks.  相似文献