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As a lofty mountain Nanshan stretches along the southern border of Kansu Corridor. In past two decades a few discussions had been given by some sdholars about its landforms and its quaternary glaciations. Based upon my field works and recent reports, we know that there are some close Connections existed between tectonic movements, geomorphic cycles and correlative deposits; and, Consequently, they may be mutually explained. according to the analysis of the facies and distribution of Cenozoic sediments, We Know...

As a lofty mountain Nanshan stretches along the southern border of Kansu Corridor. In past two decades a few discussions had been given by some sdholars about its landforms and its quaternary glaciations. Based upon my field works and recent reports, we know that there are some close Connections existed between tectonic movements, geomorphic cycles and correlative deposits; and, Consequently, they may be mutually explained. according to the analysis of the facies and distribution of Cenozoic sediments, We Know that there a peneplanation developed on the older rocks of Nanshan till pper pliocene, and the red deposits which extended over the Nansban and its adjacent regions Were laden down in the same time. Probably laterly, a crusalt movement, which included mul iple uplifts, initiated. The present geomorphic features of Nanshan are possibly resulted from them. as the dissected summit-levels, the remnants of old peneplains Can be found on many mountain tops today. As regards quaternary glaciations of Nanshan, a more important sign ification should be ascribed to the uplifts of this mountain. Perhaps boh because of the uplifts and the Climatic changs, in Nanshan two glacio pluvial periods had occured in quaternary. When the glaciers expanded all of the mountain peaks and valleys. Later on, the glacio fluvial waters were Carrying much debris and forming sedimentary units, which have been called inland molasse formation, into piedmont plain. a distinct interval, which indicat a true interglacial stage, have been found in that formation. The following table shows the main geological changes of Cenozoic of Nanshan.

河西走廊之南延伸着雄伟的祁连山,在过去20年中一些学者曾对该山的地貌和其第四纪冰期作过一些探讨。根据本人的野外工作及最近的文献资料,我们看到,在构造运动、地貌循环和相关沉积三者之间有着紧密的联系,因而,它们可以相互解释。分析岩相和新生代沉积的分布,我们得知直到上上新世,祁连山进行着准平原化的过程,同时并沉积下红色沉积,它遍及祁连山内外。后来,地壳运动开始,它包括多次上升。现代的祁连山的面貌即是多次上升的产物。古准平原的遗跡,目前可在许多山顶发现。祁连山的第四纪冰期的发生,山地上升占有重要地位,可能正是由于上升和气候变化的同时作用,祁连山发生两次冰期——多雨时期。当时冰川遍及山峰和谷地,稍后,冰融水携带大量碎屑物质带入山足平原形成内陆磨拉石建造的沉积。在该沉积岩系中发现有一清楚的间断,这代表一次真正的间冰期。祁连山新生代的主要地质事件见84页附表。

The following conclusions can be drawn from the present analysis:(1)It is practical to think that the migration of the moths can be solved into 3 succes-sive components,namely,the“ascending movement”,the“transmigration”and the“descend-ing movement”.The analysis of the last one and its association with certain meteoro-physicalconditions helps us to find out the intrinsic and extrinsic causes affecting such movement aswell as to appreciate their relative values.(2)Through an actual analysis of 163 cases of“sudden...

The following conclusions can be drawn from the present analysis:(1)It is practical to think that the migration of the moths can be solved into 3 succes-sive components,namely,the“ascending movement”,the“transmigration”and the“descend-ing movement”.The analysis of the last one and its association with certain meteoro-physicalconditions helps us to find out the intrinsic and extrinsic causes affecting such movement aswell as to appreciate their relative values.(2)Through an actual analysis of 163 cases of“sudden high catch”that happened inthe 985“favorable air current for moth-carrying”conditions,it is realized that in theprocess of decending movement the intrinsic habitual response should not be neglected.It isquite possible that such movement is the“kinetic reaction”under certain external environmentalconditions.The most important factors that determine whether moths would decend in a certaindistrict or not,might be the“circadian rhythm”and the meteoro-physical conditions.(3)It is found that the association of“sudden high catch”and certain weather condi-tions is close and significant.Moreover,under different weather conditions,the conditionalprobabilities are all different.(4)Among the weather conditions,“cyclonic center”,“cold front area”and“thunder-storm”are all favorable for the decending movement of migrating moths.Raining weatherranks next to the above mentioned ones;while under the so-called“general weather conditions”,the frequency of occurrence of“sudden high catch”is relatively low(see Table 4).(5)A possible mechanism of the decending behavior has been discussed.It is pointed outthat“cyclonic pocket”,“air disturbance”and“decending air movement”may constitue thephysical causes of such reaction.Rainfall in a certain degree may also favor the descent ofmoths,while the ascending air movement may be unfavorable for such movement.

本文对气流场与粘虫迁飞关系作了分析,表明在900—950mb 层(即400—900米高度)气流场中有适于携虫的气流存在。在各类气象条件下,粘虫蛾发生突增的条件概率,其结果(在气流有利于携虫的前提下):无条件概率值为0.1665;各条件概率值分别为:在雷暴状况下发生突增的条件概率为 0.4000;在降雨状况下发生突增的条件概率为 0.2812;在冷锋区发生突增的条件概率为 0.3720;在暖锋区发生突增的条件概率为 0.2222;在气旋中心区发生突增的条件概率为 0.4000;在“一般性天气”发生突增的条件概率为 0.1166;因此,初步结论是:气旋中心区、冷锋区、与雷暴均显著地有利于扩迁粘虫蛾的降落,而降雨、暖锋区、虽然也有或多或少的有利倾向,但是不够显著。由于在“一般性天气”条件下亦有相对多的蛾量突增的现象发生,这表明很可能降落过程与运转过程不同,在一定程度上与粘虫本身的自主性降落有关。估计这很可能与粘虫蛾的“生物钟”反应有所联系。在本文中亦对各种气象物理事件对于扩迁粘虫蛾降落过程的可能作用机制作了讨论。

A method for finding the statistical properties of scattered fields caused by scatterers is established. The chief points of this method are the applications of the theory of random time-varying networks and the theory of streams of random events in queueing theory. An expression of space-time correlation function of scattered fields is established by this method. More factors, such as the random motions of scatterers, the statistical dependence between these motions, the inhomogeneities (including stratified...

A method for finding the statistical properties of scattered fields caused by scatterers is established. The chief points of this method are the applications of the theory of random time-varying networks and the theory of streams of random events in queueing theory. An expression of space-time correlation function of scattered fields is established by this method. More factors, such as the random motions of scatterers, the statistical dependence between these motions, the inhomogeneities (including stratified inhomogeneity) of propagation medium, the dispersion and absorption by the medium, the differences between scatterers, and the like, are taken into account in this expression. These factors are always unnegligible in most practical problems. Moreover, the functional forms of transmitted signals, directivity of radiation, spatial distribution of scatterers, scattering coefficients, etc. are unrestricted in this expression.As an example, the statistical properties of back scattering of underwater sound by the bubbles, the random motions of which are caused by the waves, are studied.

本文提出了一种寻求散射体羣的散射场的统计性质的方法.该法要点在于运用随机时变网络理论及排队论中关于随机事件流的理论.借助于此法,本文建立了散射场的空间-时间相关函数的表示式.与其他作者已建立的公式相较,该式计及一系列常为实际问题所不容忽略的因素,例如诸散射体的随机变速运动及其间的统计关联,传播媒质的非均匀性(包括分层非均匀性)、吸收及色散,以及诸散射体性质的相异性等等,并且对发射信号、辐射方向性、散射体羣的空间分布及散射系数等等的函数形式均未给予任何限制.

 
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