Modeling and calculation of bed score around large-diameter vertical cylinder under wave action     

I. Sh. Khalfin 《Water Resources》2007,34(1):49-59

The results of studying the scour of bed composed of fine and coarse sand around models of large-diameter vertical cylinder under the effect of regular waves are presented. Comparison of the results of experiments with fine and coarse sand showed essential qualitative and quantitative distinctions between the two cases. The results of experiments with coarse sand were used to derive, for the first time, a formula for the estimation of the score depth, including two similarity criteria—the sediment motion factor (SM-factor), and Keulegan-Carpenter number. This formula is applicable to both the engineering analysis of the scour depth of gravel bed or protective riprap by crashed rock or fine stone and the approximate prediction of the scour depth of sand bed around structures under real storm conditions. The conditions for correct modeling of wave scour around structures with large horizontal dimensions are considered and the irrelevance of modeling such scour with the use of fine-sand models is demonstrated.  相似文献   

Neutron stars in the bimetric scalar—tensor theory of gravitation. II. solutions with a variable scalar field     

L. Sh Grigorian  P. F. Kazarian  H. F. Khachatrian 《Astrophysics》1998,41(1):85-88

Solutions of the equations of the bimetric scalar—tensor theory of gravitation with a variable scalar field are found for configurations of superdense matter with different versions of the equation of state. The possible existence of static superdense and supermassive configurations is established for all of the versions of the equation of state of superdense matter used. Translated from Astrofizika, Vol. 41, No. 1, pp. 131–135, January-March, 1998.  相似文献   

Meteorological modification of particulate air pollution and visibility patterns at Phoenix,Arizona     

Dr. Sh. B. Idso  Dr. K. R. Cooley 《Theoretical and Applied Climatology》1981,29(3):229-237

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Young magmatism in Afghanistan as the consequence of the neocene-quaternary tectonic movements     

V.M. Chmyriov  V.I. Dronov  Sh. Abdullah 《Tectonophysics》1979,52(1-4)

A considerable portion of the territory of Afghanistan, having structures of the Mediterranean folded belt, has been subjected to a general tectonomagmatic activization over the Miocene through to the present, resulting in different (predominantly oscillating) tectonic movements, intrusive magmatism, terrestrial volcanism, mineral occurrences, and springs of carbonated and nitrous thermal water.Three types of young magmatism and volcanism products have been recognized in Afghanistan:

1. (1) Miocene alkaline granite intrusions, described as the Share—Arman Complex, resulted from the early orogenic stage of the Late Alpine geosynclinal troughs development and were restricted to transversal uplifts, in both the geosynclinal structures and on their extension, in the surrounding median masses. These transversal uplifts also play the role of mineralization-controlling structures.

2. (2) Late orogenic—Early Quaternary volcanics (the Dash-i-Nawar Complex) cropping out by the periphery of median masses and at the marginal uplifts of the Late Alpine folded area and also restricted to the transversal uplifts with the confined fault zones to them.

3. (3) Alkaline carbonatitic (the Khanneshin Complex) and trachybasaltic (the SarLogh Complex) Early—Middle Quaternary volcanics in the inner parts of the Central Afghanistan Median Mass and in the southeastern segment of the Turan Plateau.

Areas with products of Middle Quaternary volcanism are restricted to knot areas of the major subcrustal faults which are currently active.  相似文献   

Evolution of an active continental margin as exemplified by the Alpine history of the Caucasus     

Sh.A. Adamia  M.B. Lordkipanidze  G.S. Zakariadze 《Tectonophysics》1977,40(3-4):183-199

A plate-tectonics model of the Alpine evolution of the Caucasus is suggested. According to the model, in the Jurassic-Neocomian the Caucasian territory comprised the shelf of the East European platform, the marginal sea of the Great Caucasus, the Pontian-Transcaucasian island arc, the Anatolian-Minor Caucasian oceanic basin (Tethys) and the Iranian-Turkish microcontinent. Along the northern margin of the oceanic basin a convergent plate juncture extended. Part of the Caucasus, situated north of this plate boundary, represented the West Pacific-type active margin of the East European platform. In the Middle Cretaceous the Iranian-Turkish microcontinent collided with the Pontian-Transcaucasian island arc and as a result the Transcaucasian-Minor Asian continental block originated. In the central part of the latter an extensive Paleogene andesitic belt formed, with the Black Sea-Adjara-Trialetian and Talysh-South Caspian basaltic rift troughs on its rear (northern) side (incipient Black Sea and South Caspian basins). Major plate boundary shifted south, into the Zagros-Taurus basin, though the Anatolian-Minor Caucasian suture zone remained mobile in the Upper Cretaceous and Paleogene. From the Oligocene, under conditions of ongoing convergence of the Eurasian and Afro-Arabian continental blocks, the present-day intracontinental mountainous foldbelt has developed.  相似文献   

Relationship of Solar Radio Emission at λ=1.43m and Optical Processes in the Sun     

Sh. Makandarashvili  N. Oghrapishvili  D. Japaridze  D. Maghradze 《Astrophysics》2016,59(3):383-388

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Theory of gravitation taking into account the part played by the vacuum. II     

L. Sh. Grigoryan  G. S. Saakyan 《Astrophysics》1986,24(3):338-344

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Application of Rock Mass Characterization for Determining the Mechanical Properties of Rock Mass: a Comparative Study     

Mahmoud Hashemi  Sh. Moghaddas  R. Ajalloeian 《Rock Mechanics and Rock Engineering》2010,43(3):305-320

The results of geotechnical explorations, engineering geological investigation (including laboratory and in situ tests) and field observations have been used, along with borehole logging charts, to obtain the rock mass geotechnical data. Based on the data, the rock mass along the Sabzkuh water conveyance tunnel route was classified by rock mass rating (RMR), Q-system (Q), rock mass index (RMi) and geological strength index (GSI) (3 methods). A new series of correlations were established between the systems based on the data collected from the study area. These relationships were then compared with those reported in the literature, and two new relations were recommended. The classifications were utilized to calculate mechanical properties (rock mass strength and deformation modulus) of the rock mass along the tunnel according to available empirical relations, and to distinguish the upper-bound and lower-bound relations.  相似文献   

    

I. Sh. Khalfin 《Water Resources》2007,34(3):357

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On the calculation of spurious velocity signal produced by atmospheric differential extinction in whole-disk oscillation measurements     

Sh. Ehgamberdiev  I. Khamitov 《Solar physics》1991,133(1):81-88

The systematic diurnal signal drift in full-disk solar oscillation measurements has been calculated taking into account differential rotation, the inclination of the rotational axis of the Sun with respect to the picture plane, the limb-darkening function and a realistic estimation of the sky transparency, slightly variable during the day. An illustration of this method on the Kumbel (U.S.S.R.) IRIS data is presented and discussed.  相似文献