冷凝作用对熔岩流动力学性质的影响     

Mrak.  V 郭正府 《国外地质与勘测》1994,(3):1-5,10

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罗马尼亚四个火烧方案的实施情况     

Mache.  V 吴锦莲 《国外石油地质》1993,(1):87-100

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阿尔泰信纽新铜金矿床氧化带形成过程中自然金的组分演化     

N. V. Rosliakova  L. N. Pospelova  V. B. Marshuk 《地质与资源》1994,3(4):306-311

该矽卡岩型铜金矿床位于阿尔泰萨拉寇克申花岗杂岩体与下寡武统火山沉积岩之接触带上，热液型金矿化（360-130℃）多叠加于早期矽卡岩（ > 400℃）之上。金矿化多分布于石榴万一硅灰石矽卡岩中。在氧化作用过程中导致次生成化物富集、自然金的成色降低，原因是金的活动性比银更强。与之同时，在氧化作用过程中自然金有部分银去除，故其成色与内生矿石中自然金相近。因此，在氧化带中自然金的成色具有广阔的离散性特点。为此，在评价深部矿石过程中应充分地加以考虑。  相似文献   

Relationships between the global general circulation and the indian summer monsoon     

M. Sankar-Rao  V. N. Lykossov  E. M. Volodin  A. E. Nikitin  A. I. Degtiarev  Kusuma G. Rao 《大气科学进展》1991,8(2):137-148

The relationships between the global general circulation and the Indian monsoon during active and break phases are investigated with the help of FGGE IIIb data.It was found that the ultralong wave component positive and negative height anomalies over Tibet are associated with active and break monsoon phases respectively. This ultralong wave component has significant effect even upto 22oN over the Indian region which is the monsoon trough region. During a monsoon break, the general circulation was found to be more turbulent in the sense that more waves become energised.It was observed that during a break, blocking prevails over the Siberian region and cold air advection takes place toward Indian region from Siberian region depressing the temperatures over the Indian region by about 1oC. During the break, the Indian region gets connected with higher latitudes by the south winds blowing from polar Soviet re-gions to the Indian region. From active to break phase the zonal component weakens by about 25% from Indian ocean area right upto Alaskan region, along the east coast of Asia.  相似文献   

关于推行地震观测中震级测定新方法的简要说明     

N.V.Kondorskaya 《地震译文集》1990,9(1):52-56

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Monsoon rainfall and southern oscillation responses in the pressures over the Northern Indian Ocean     

K.D. Pras  S.V. Singh 《大气科学进展》1988,5(2):243-251

The pressure variations over the North Indian Ocean during the summer monsoon season have been exam-ined using the monthly data from June to September for the period 1961 to 1968. It is found that these varia-tions can be described by two significant eigenvectors (EV1 and EV2) which together account for 53% of the total variance.The first eigenvector (EV1) represents in phase variation over both, the Arabian Sea and the Bay of Bengal with higher variations over the northern side of the area. The second eigenvector (EV2) depicts the out-of-phase variation between the pressure anomalies over the north and the south of 15°N latitude with two areas of pronounced variation, viz., the head Bay of Bengal and the equatorial region near 65°E longitude.The coefficients of EV1 show significant association with rainfall of West Coast and Central India for the concurrent months. These coefficients also show significant association with the pressure and temperature indices of the Southern Oscillation. The coefficients of EV2 show significant association with the monsoon rainfall of south peninsular India.  相似文献   

1983年土库曼西部Kum—Dag地震的构造特征     

V.G·Trifonov  G·A·Vostrikov  张小冬 《内陆地震》1988,(1)

本文论述了1983年土库曼西部Kum—Dag地震的构造特征,特别是地表变化的形态和运动学以及地球动力特征、第四纪末构造和现代构造模式的背景。 1983年3月14日12时12分54秒在涅比特达格东南40公里处发生了震级M_(LH)=5.7的地震。震后出现了一条地震破裂。我们认为这是地表出现的震源破裂现象并在1983年对此进行了详细调查。我们使用了土库曼地震台网的地震图和N.V Petrova和她在土库曼苏维埃社会主义共和国科学院,地震研究所的同事们所编绘的1983年Kum—Dag原始地震目录。根据这些资料得到主震的震中坐标如下:φ=39.20°N.λ=54.66°E(误差为±25公里)震源深度H=7—8公里。  相似文献   

Technological risk regulation of the subgrade base stability in permafrost areas     

S. Ya. Lutskiy  T. V. Shepitko  Alexey Y. Burukin 《寒旱区科学》2017,9(3):321-324

Maintenance and risk estimation of a weak roadbed condition during the construction period are described.Risk-management procedure for unstable,weak soils is proposed through adjusting the technological loads and real-time monitoring of their influence.The efficiency of implementing maximum allowable vibroloads and the drainage system for strengthening weak soils is shown in the example of the Northern Latitudinal Railway area.  相似文献   

Roadbed, embankment, tower support and culvert stability problems on permafrost     

V. G. Kondratiev 《寒旱区科学》2013,5(4):0377-0386

The history of railway and highway construction in permafrost zones in Russia, the United States, Canada, and China spans more than 110 years. Nonetheless, no railway track or highway has yet been built in such area that is impervious to deformation caused by subsidence resulting from the thawing of ice-rich subgrade soils. This paper presents data on the roadbed states of the Transbaikalian and the Baikal-Amur Railways as well as the Russian "AMUR" Chita-Khabarovsk Highway. It also discusses the feasibility of roadbed stability maintenance using methods based on the reduction of the mean annual ground temperature and roadbed preservation in a permafrost state by means of the natural cooling and heating factors ratio regulation resulting in a reduction of the heat generation in the roadbed and the adjoining area accompanied by an increase of heat consumption with help of the sun-precipitation protective sheds (awnings), rock covers, dolomite powder (reflective paint), cooling tube and thermosyphons as well as tower supports and corrugated pipe culverts stability.  相似文献   

Modelling of Indian Monsoon Rainfall Series by Univariate Box-Jenkins Type of Models     

S.D.Dahale  S.V.Singh 《大气科学进展》1993,(2)

The time domain approach, i.e. Autoregressive (AR) processes, of time series analysis is applied to the monsoon rainfall series of India and its two major regions, viz. North-West India and Central India. Since the original time series shows no modelable structure due to the presence of high interannual variability, a 3-point running filter is applied before exploring and fitting appropriate stochastic models. Out of several parsimonious models fitted, AR(3) is found to be most suitable. The usefulness of this fitted model is validted on an independent datum of 18 years and some skill has been noted. These models therefore can be used for low skill higher lead time forecasts of monsoon. Further the forecasts produced through such models can be combined with other forecasts to increase the skill of monsoon forecasts.  相似文献