基于TCP/IP协议的地震波形数据实时传输技术在数字地震台网联网中的应用     

吕金水  黄文辉 《华南地震》2001,21(3):37-41

介绍了TCP/IP传输协议及其在广东省数字地震台网联网中进行地震波形准实时传输应用的技术思路和解决方案.  相似文献   

地震数据数字化及实时传输     

彭伟荣  闵祥仪  张幼敏  常千军  王斌  尹志文  张昱  李发科 《地震工程学报》1996,(1)

简要地介绍了地震数据国际交换试验系统和台站地震数据实时采集传输系统的组成、各部分的特性与功能、地震数据数字化及实时传输过程。  相似文献   

预破裂中声波信号参数特性     

巴卡.  M 《内陆地震》1996,10(1):79-85

通过对岩石样品进行变形及破坏试验，研究断裂形成过程中的声发射记录（ＡＥ），以找到能解释地震前兆现象的方法．另外，对试验过程中获得的大量数据及资料进行了数理统计处理．  相似文献   

A NEW QUANTITATIVE WAY FOR DETERMINING LEAF AREA INDEXAND NET PRIMARY PRODUCTIVITY IN REGIONAL SCALE   总被引：1，自引：0，他引：1  

Zhang Renhua 《地理学报(英文版)》1996,(4)

IntroductionThemaJorpurposeforremotesensingistoobtuinqUantitativevaluabledrirmationonvanousaPplicahons.PanicularlybiophysicalparametersinwionalandglobalscaleareofintereSttoanumberofdomams.ForinStancem,croPyteldestiInatinleafareaindex,chiorophyllcontentandheightofcroparecruaalindex.EvaPotranSirationinroponalscalenedstogctdistnbtaloninformationofcrophdghttoinferrowiessOfsuffoceandsoon.AsthoopthenormaldifferenceVegetaonindex(NDVI)hasbecameaverypoPularmethodtoeinmateLAI,therelationshipbet…  相似文献   

声波在两种多孔介质界面上的反射和透射   总被引：11，自引：1，他引：11       下载免费PDF全文

乔文孝  王宁 《地球物理学报》1992,35(2):242-248

本文导出了声波在两种多孔介质界面上反射、透射的一般计算公式.作为例子,数值计算了P₁波入射于界面时,P₁、P₂和S波的反射、透射系数与声波频率、入射角等量之间的关系.结果表明,各种模式波的反射、透射系数与入射角、多孔介质性质有关,在Biot特征频率附近与频率有关,并用界面两侧的法向能流相等验证了结果的正确性.若把多孔介质当作均匀固体处理,将会得到显著不同的结果.  相似文献   

岩石蠕变破坏实验研究及其对地震预报的意义          下载免费PDF全文

赵阿兴 《地震地质》1992,14(1):89-95

通过对不同温度和围压条件下济南辉长岩的蠕变破坏实验结果和声发射特征分析,本文提出以岩石蠕变破坏应变做为岩石蠕变破坏判据。建立了岩石蠕变破坏应变的经验关系式。依据实验结果得到相应的济南辉长岩蠕变破坏应变参数,进一步探讨了预报岩石蠕变破坏和地震的方法  相似文献   

肇东陨石低钙辉石超微结构的研究   总被引：1，自引：1，他引：1  

黄婉康  王岩国 《矿物学报》1992,12(2):102-110,T002

在肇东陨石低钙辉石中观察到各种堆垛缺陷,包括斜方-单斜辉石相转变、畴结构、2.7nm长周期结构以及自然界极为罕见的奇数倍八面体层堆垛缺陷——1.35nm等。高分辨像所揭示的1.35nm的新特征是可以重复两次。文中提出1.35nm的结构是“A+B+A-”型。1.35nm片晶仅见于3,4型球粒陨石,因而它可作为由原顽火辉石淬冷形成的、末遭受后期热变质的典型结构。奇数倍0.9nm宽度单斜辉石片晶在吉林陨石(H5)、安龙陨石(H5)及东台陨石(LL6)中均有出现,它表明这些陨石的辉石都曾由原顽火辉石转变而成。 肇东陨石低钙辉石中相当频繁的相变以及高能量的奇数倍0.45nm层堆垛缺陷的存在,可能表明该陨石形成于退变质过程。  相似文献   

坑道透视中磁偶极发射天线的试验研究     

韦宏鹄 《煤田地质与勘探》1992,20(3):47-50

坑道电磁波透视中,用磁偶极发射天线代替电偶极发射天线后,测量工作速度快、效率高,经与电天线作对比观测,其效果几乎与电天线一样,同步及反射观测所获异常明显。试验结果表明,采用磁天线作为发射天线是可行的。  相似文献   

Lower palaeozoic and precambrian petroleum source rocks and the coalification path of alginite     

Miryam Glikson  Dennis Taylor  Douglas Morris 《Organic Geochemistry》1992,18(6)

Organic-rich samples derived from a Middle Cambrian Formation in the Georgina Basin, and from the Middle Proterozoic of the McArthur Basin in northern and central Australia, yielded alginite ranging from immature oil shale material to overmature residue. A maturation scale has been developed based on the thermal evolution of alginite as determined from reflectance and fluorescence. The coalification path of alginite is marked by jumps in contrast to the linear path of wood-derived vitrinite. Six zones have been recognised, ranging from undermature (zone I), through the mature (zones II/III), followed by a stable stage of no change (zone IV) to the overmature (zones V and VI). The onset of oil generation in alginite as evident from the present study is at 0.3% R_{o Alg.} and is expressed in a change of fluorescence from yellow to brown, and a coalification jump from 0.3 to 0.6% R_o of Alg. In many boreholes zone III can be distinguished between 0.6 and 0.8% R_o of Alg. where subsequent oil generation occurs. Zones II and III represent the oil window.A zone of little or no change designated zone IV, at of alginite follows zones II/III. A marked coalification jump characterises zone V, where a pronounced change in reflectance occurs to >1.0% R_{o Alg.}, signifying peak gas generation. The border of oil preservation lies at the transition of zone V and VI, at 1.6% R_{o Alg.} In zone VI gas generation only occurs.Comparison of reflectance results with experimental and geochemical pyrolysis data supports high activation energies for hydrocarbon generation from alginite, and therefore a later onset of oil generation than other liptinite macerals (i.e. cutinite, exinite, resinite) as well as a narrow oil window.Transmission electron microscopy (TEM) confirms that alginite does not go through a distinct intermediate stage but that the percentage of unreacted organic matter decreases as maturation proceeds. A clear distinction can be made in TEM between immature alginite, alginite after oil generation, and alginite residue following gas generation. Alginite beyond 1.6% R_o acquires very high densities and the appearance of inertinite in TEM.Bitumens/pyrobitumens make a pronounced contribution to the organic matter throughout the basins and have been shown to effect pyrolysis results by suppressing T_max. The bitumens/pyrobitumens have been divided into four groups, based on their reflectance and morphology, which in turn appears to be an expression of their genetic history. Their significance is in aiding the understanding of the basins' thermal history, and the timing of oil and gas generation.  相似文献   

Estimation of abl Parameters Using the Vertical Velocity Measurements of an Acoustic Sounder   总被引：2，自引：0，他引：2  

J. A. Kalogiros  C. G. Helmis  D. N. Asimakopoulos  P. G. Papageorgas 《Boundary-Layer Meteorology》1999,91(3):413-449

The friction velocity, the surface heat flux and the height of the Atmospheric Boundary Layer (ABL) are important parameters. In this work, vertical velocity variance ( _w ² ) and wind velocity structure parameter (C _v ² ) profiles estimated by acoustic sounder measurements are used, along with similarity relations, to estimate these parameters in the unstable Atmospheric Boundary Layer and the friction velocity in the stable one. The data were collected by two acoustic sounders with different height range and resolution under various atmospheric conditions (stability) and at two experimental sites in different terrain. The C _v ² profiles are estimated using gate difference of the vertical velocity measurements and the assumption of local isotropy. The vertical velocity data are corrected for the significant effects of noisy measurements and sampling volume averaging on the _w ² and C _v ² estimations using original techniques that are presented in this work. The results of the similarity method using acoustic sounder data are compared against estimates of the corresponding atmospheric parameters obtained from direct measurements. The comparison confirms the ability of the method to provide reasonably accurate estimates of these parameters especially in the middle of the day.  相似文献