Stochastic Modelling of Mineral Exploration Targets     

Talebi  Hassan  Mueller  Ute  Peeters  Luk J. M.  Otto  Alex  de Caritat  Patrice  Tolosana-Delgado  Raimon  van den Boogaart  K. Gerald 《Mathematical Geosciences》2022,54(3):593-621

Mathematical Geosciences - Mineral deposits are metal enrichment anomalies, occurring as local manifestations of the interplay between various geological processes that operate at a wide range of...  相似文献   

Sub-Mesoscale Vortex Streets in the Region of the Shantar Islands (Sea of Okhotsk), According to Satellite Remote Sensing Data     

Zhabin  I. A.  Luk’yanova  N. B. 《Izvestiya Atmospheric and Oceanic Physics》2020,56(12):1615-1620

Izvestiya, Atmospheric and Oceanic Physics - Images in the visible range of the MODIS Terra/Aqua and ETM+ Landsat 7/OLI Landsat 8 satellites are used to study vortex streets (VSes) in the region of...  相似文献   

Estimation of water-vapor and ozone transport in the upper troposphere-lower stratosphere and fluxes through the tropopause during the field campaign at the Sodankyla station (Finland)     

A. N. Luk’yanov  A. Yu. Karpechko  V. A. Yushkov  L. I. Korshunov  S. M. Khaikin  A. V. Gan’shin  E. Kyro  R. Kivi  M. Maturilli  H. Voemel 《Izvestiya Atmospheric and Oceanic Physics》2009,45(3):294-301

Processes of mass exchange through the tropopause at extratropical latitudes are studied. For this purpose, balloon data on ozone and water vapor obtained during the LAUTLOS field campaign were analyzed and a trajectory model was used to analyze the origin of air masses and to calculate fluxes through the tropopause. The results of observations and trajectory modeling showed that tropospheric air masses penetrated into the stratosphere by no more than ～2.5 km above the tropopause level during the campaign. Both tropospheric and stratospheric particles are present in this mixing layer. Backward trajectories showed that, at the anticyclone boundary, tropospheric air penetrates into the stratosphere in the form of fine fibrous structures (filaments). The fluxes through the tropopause were also quantitatively estimated by the Wei method with the use of forward and backward trajectories. The spatial structure of the fluxes through the tropopause coincides with the regions of the tropopause inclination and its folds. The absolute values of the fluxes calculated with the use of the Wei method decrease, depending on the length of trajectories at the expense of the filtering-out of a shallow reversible exchange. It is shown that the exchange depth can be controlled by both vertical fluxes in the troposphere and changes in the level of the tropopause itself. The use of isentropic and three-dimensional trajectories made it possible to estimate the contribution of nonadiabatic processes to the stratosphere-troposphere exchange.  相似文献   

Types of Arctic coasts of Russia     

S. A. Luk’yanova  G. A. Saf’yanov  G. D. Solov’eva  L. M. Shipilova 《Oceanology》2008,48(2):268-274

Typification of the northern coasts of Russia is performed. The spatial distribution and quantitative relations of different types of coasts along the entire Russian Arctic seaside are considered. The types of coasts cover the situation existing over the entire World Ocean. A short-term forecast of the evolution of different coast types under the conditions of climate changes is formulated.  相似文献   

Mechanism of the formation of volcanic chains of French Polynesia     

A. P. Sedov  G. I. Kazakevich  V. V. Matveenkov  L. P. Volokitina  S. V. Luk’yanov  V. A. Rashidov 《Oceanology》2008,48(4):578-587

A possible mechanism of the formation of chains of intraplate seamounts and islands alternative to the “hot spot” hypothesis is considered. It is related to the appearance of additional stresses in the lithospheric plate when it ascends over a mantle inhomogeneity and descends from it. The magnitude of these stresses (～600 bar) is sufficient for formation of deep fracture zones. In the paper, schemes of formation of volcanic chains are described. The formation of the “faults-volcanoes-volcanic chains” sequence may follow two different ways. The first is controlled by the fracture zones formed along the direction of the plate movement. In this case, feeding channels are localized along the boundary of the rise. If the chain is gradually formed simultaneously with the plate motion, the age of the volcanoes along the chain may change in a more or less regular way. The second type is formed by fractures orthogonal to the movement direction. They may be formed when the plate ascends over a mantle inhomogeneity and/or descends from it. In this case, adjacent volcanoes may have similar ages. A combination of these two variants may also be encountered. The mechanism posed allowed us to explain selected facts referring to the volcanic chains of French Polynesia and may be applied to other regions of the Pacific Ocean.  相似文献   

The features of the hydrochemical regime in ob inlet during the open water time     

K. V. Artamonova  S. A. Lapin  O. N. Luk’yanova  P. N. Makkaveev  A. A. Polukhin 《Oceanology》2013,53(3):317-326

The hydrochemical features of Ob Inlet in the open-water time were characterized using the data of the surveys during two seasons of different water content. The inlet was subdivided into the “riverine,” “marine,” and intermediate areas being different in the factors determining their hydrochemical regime. The processes occurring in each of the distinguished areas were considered in detail. Special attention was paid to the hydrochemical features in the mixing area of the fresh and saline waters (the frontal zone) within the periods of the maximum and minimum biological activity in the aquatic area of Ob Inlet.  相似文献   

Results of multiyear studies on the dynamics of pollution of lake Baikal by polycyclic aromatic hydrocarbons in the area waste water discharge from the Baikal Pulp and Paper Plant     

A. M. Nikonorov  A. A. Matveev  S. A. Reznikov  V. S. Arakelyan  N. N. Luk’yanova 《Doklady Earth Sciences》2012,443(1):361-364

New data on the concentration and spatial distribution of the benz(a)pyrene and polycyclic aromatic hydrocarbons in bottom sediments in the testing area of the Baikal Pulp and Paper Plant (BPPP) waste water discharge in 1981–1988 and 2010 are presented in this paper. The bottom sediments in this section of the lake are strongly polluted with polycyclic aromatic hydrocarbons.  相似文献   

Determination of Total Sulfur in Fifteen Geological Materials Using Inductively Coupled Plasma‐Optical Emission Spectrometry (ICP‐OES) and Combustion/Infrared Spectrometry     

Lukáš Ackerman  Jan Rohovec  Ondřej Šebek 《Geostandards and Geoanalytical Research》2012,36(4):407-414

A method for the determination of total sulfur in geological materials by inductively coupled plasma‐optical emission spectrometry (ICP‐OES) is described. We show that good results were obtained using this method even for sample types with very low (< 20 μg g^?1) sulfur concentration (e.g., peridotite). Sulfur was determined in fifteen geological reference materials with different sulfur contents. For reference materials with certified sulfur contents, the ICP‐OES method gave results in excellent agreement with certified values, and uncertainties better than 4% RSD. ICP‐OES results for sulfur in other reference materials yielded RSDs better than 10%, where S concentrations were > 100 μg g^?1 (except for diabase W‐2a, 16% RSD). Reference materials with lower sulfur contents (< 40 μg g^?1) showed much higher RSDs (17–18%). Except for RMs with certified values for sulfur, most data obtained by the combustion infrared detection method generally showed higher concentrations than those measured by ICP‐OES and a better RSD (≤ 8% for all materials except DTS‐2b).  相似文献   

METHODOLOGY: A SIMPLE RAINFALL SIMULATOR AND TRICKLE SYSTEM FOR HYDRO-GEOMORPHOLOGICAL EXPERIMENTS     

Shiu-hung Luk  Athol D. Abrahams  Anthony J. Parsons 《自然地理学》2013,34(4):344-356

A simple rainfall simulator is described which consists of stand-alone sprinkling units with cone jet nozzles that spray downward. With a fall height of 4.57 m and water pressure of 67 kPa, the median drop size of the simulated rainfall is 2.40 mm. Rainfall from two units irrigating a 2 by 2.5 m plot has a total kinetic energy of 0.57 J/m²/s which is approximately 90% of the equivalent energy of natural rainfall at the simulation intensity of 72.4 mm/h. To simulate overland flow, perforated trickle pipes were designed that permit overland flow rates to be readily adjusted and closely controlled by simply varying the input water pressure. In field experiments in southern Arizona, rates between 572 to 1400 cm³/s were generated from a 19-mm pipe. Given their low cost, simplicity, and portability, the rainfall simulator and trickle system should be attractive to researchers working in a wide variety of geomorphic environments.  相似文献   

Analog of the surfaces of zero velocity in the restricted elliptic,parabolic, and hyperbolic three-body problem     

L. G. Luk’yanov 《Astronomy Letters》2010,36(11):823-833

The surfaces of minimum energy have been constructed in the noncircular restricted three-body problem, which are a generalization of the surfaces of zero velocity known in the circular problem. The Hill stability, conditional stability, and instability criteria have been established. Some astronomical applications of the results obtained are considered.  相似文献