The role of plicative structures as forecast criteria in the Alakit-Мarkhinsky field (western Yakutia)

2021 ◽  
pp. 6-13
Author(s):  
Dmitry Ivanov ◽  
Alexander Tolstov ◽  
Vyacheslav Ivanov
Keyword(s):  
Opposite Sign ◽  
Kimberlite Pipe ◽  
Pipe Formation ◽  
Regional Factors ◽  
Tectonic Features ◽  
Low Amplitude ◽  
Kimberlite Field

This paper describes the tectonic features of the Alakit-Markha kimberlite field, regional factors of kimberlite magmatism control in this area, structural and tectonic preconditions for kimberlite pipe prospecting. The paper highlights kimberlite pipe formation features and the role of tectonics in this process. The most promising areas are those related to low-amplitude negative structures (e.g. depressions), especially transverse low-amplitude complications of the opposite sign for the main plicative structure: for antiforms (elevations), these are saddle-shaped depressions, and antiform elevations are for synforms (depressions).

Ecological, coenotic and floristic analysis of groups of associations of broadleaved-coniferous forests from central European Russia

2001 ◽  
pp. 38-48 ◽  
Author(s):  
L. B. Zaugolnova ◽  
I. I. Istomina ◽  
E. V. Tikhonova
Keyword(s):  
Wide Distribution ◽  
European Russia ◽  
Coniferous Forests ◽  
Computer Data ◽  
East Europe ◽  
Central European ◽  
Reference Base ◽  
Floristic Analysis ◽  
Regional Factors

Two computer data bases were formed: reference base «Prodromus» including the nomenclature forest syntaxa and experienced geobotanic releves «Forests of European Russia». Ecological, coenotic and floristic analysis of broadleaved-coniferous forests mostly corresponding to association Rhodobryo rosei – Piceetum abietis Korotkov 1986 was conducted with these bases. Releves (305) from South taiga and broadleaved-coniferous subzone were used. The analysis revealed complex syntaxonomy, bo­real-nemoral character and wide distribution ass. Rhodobryo-Piceetum from central European Russia. Ecolo­gical comparison of this association with some no­men­clature types of broadleaved-coniferous communities in East Europe was carried out. Preliminary prodromus for Euro­pean Russian mixed forests is suggested. Role of ecologi­cal, succession and regional factors was shown for dif­ferentiation of syntaxa.

The Propagation Mechanism of a Vortex on the β Plane

2007 ◽  
Vol 37 (9) ◽  
pp. 2316-2330 ◽  
Author(s):  
Peter Jan van Leeuwen
Keyword(s):  
Coriolis Force ◽  
Opposite Sign ◽  
Propagation Mechanism ◽  
Reduced Gravity ◽  
Background Current ◽  
Background Flow ◽  
Coriolis Parameter ◽  
First Order ◽  
Flow Changes

Abstract The propagation velocity and propagation mechanism for vortices on a β plane are determined for a reduced-gravity model by integrating the momentum equations over the β plane. Isolated vortices, vortices in a background current, and initial vortex propagation from rest are studied. The propagation mechanism for isolated anticyclones as well as cyclones, which has been lacking up to now, is presented. It is shown that, to first order, the vortex moves to generate a Coriolis force on the mass anomaly of the vortex to compensate for the force on the vortex due to the variation of the Coriolis parameter. Only the mass anomaly of the vortex is of importance, because the Coriolis force due to the motion of the bulk of the layer moving with the vortex is almost fully compensated by the Coriolis force on the motion of the exterior flow. Because the mass anomaly of a cyclone is negative the force and acceleration have opposite sign. The role of dipolar structures in steadily moving vortices is discussed, and it is shown that their overall structure is fixed by the steady westward motion of the mass anomaly. Furthermore, it is shown that reduced-gravity vortices are not advected with a background flow. The reason for this behavior is that the background flow changes the ambient vorticity gradient such that the vortex obtains an extra self-propagation term that exactly cancels the advection by the background flow. Last, it is shown that a vortex initially at rest will accelerate equatorward first, after which a westward motion is generated. This result is independent of the sign of the vortex.

Regional factors of grain crop yield growth in the dynamics of recent years

2021 ◽  
pp. 29-36
Author(s):  
Yuriy P. Bondarenko ◽  
Keyword(s):  
Crop Yield ◽  
Crop Yields ◽  
Methodological Approach ◽  
Climatic Conditions ◽  
Grain Production ◽  
Fixed Assets ◽  
Production Complex ◽  
Grain Crop ◽  
Regional Factors

In view of the significant increase in grain production in Russia, a methodological approach is proposed to analyze the significance of regional factors of grain crop yield growth in the country in recent years, especially against the background of the lack of expansion of acreage under grain crops. Based on the results of the calculations, the effectiveness of the influence of climatic, financial, infrastructural and production factors on the growth of grain yield was described. It is concluded that various factors had different effects on the growth of grain crop yields in regions with high-, medium - and low-intensity grain production complex. The role of reducing the influence of financial factors on the growth of grain yields and a sharp increase in the role of agro-climatic conditions is noted. The revealed trend of increasing depreciation of fixed assets of agriculture as a whole is particularly emphasized, with a slight increase in the volume of their renewal and modernization in the leading regions in terms of grain crop yield growth. Without taking appropriate measures to reduce the depreciation of fixed assets in the near future, this will result in a sharp decline in the achieved volumes of grain production in the country.

Depolarizing-electrode monophasic curves and myocardial infarction ST shift

1962 ◽  
Vol 202 (1) ◽  
pp. 35-40 ◽  
Author(s):  
Gordon E. Dower ◽  
William G. Ziegler ◽  
Margaret A. Geddes ◽  
John A. Osborne
Keyword(s):  
Myocardial Infarction ◽  
Reference Electrode ◽  
Membrane Resistance ◽  
Potassium Ion ◽  
Subtraction Technique ◽  
Cell Interior ◽  
Satisfactory Explanation ◽  
Low Amplitude

The in vivo monophasic curves of the potential variations between an intracellular microelectrode and a remote reference electrode show irregular upstrokes. These can be removed by subtracting from them the ECG recorded from a wire loop surrounding the microelectrode. Since similar irregularities are present in the upstrokes of monophasic curves obtained from potassium-ion depolarizing electrodes, the effect of a similar subtraction technique was tried. Again, sigmoid upstrokes were obtained. The role of the potassium ion is to render the membrane inexcitable at the electrode. The result is that the electrode follows the potential changes of the cell interior with a lag determined by a time constant due to the membrane resistance and the capacitance of the electrode to the rest of the animal. Since the ST changes in myocardial infarction can be considered low amplitude monophasic patterns superimposed on the ECG, and it has been found that the release of potassium from damaged muscle can produce monophasic patterns, it now seems possible to present a satisfactory explanation of such changes.

‘Premier’ evidence for prolonged kimberlite pipe formation and its influence on diamond transport from deep Earth

Geology ◽  
2018 ◽  
Vol 46 (10) ◽  
pp. 843-846 ◽  
Author(s):  
Sebastian Tappe ◽  
Ashish Dongre ◽  
Chuan-Zhou Liu ◽  
Fu-Yuan Wu
Keyword(s):  
Kimberlite Pipe ◽  
Deep Earth ◽  
Pipe Formation

scholarly journals The Role of the U.S. in Terrorism in the Middle East

2016 ◽  
Vol 9 (3) ◽  
pp. 31
Author(s):  
Sadegh Piri ◽  
Ali Yavar Piri
Keyword(s):  
Middle East ◽  
Geographical Region ◽  
Foreign Countries ◽  
Widespread Phenomenon ◽  
Regional Factors ◽  
Points Of View ◽  
Development And Evolution ◽  
The U.S

Terrorism is a widespread phenomenon with a long history reflecting broad and contradictory points of view. This phenomenon has wide aspects occurring in different ways which is not belonging to a specific geographical region. Though, undoubtedly, the prevalence of terrorism in a particular area, e.g. the Middle East indicates the true potential of this given region for emergence and existence of this phenomenon. This paper tries to show the role of foreign countries, i.e. the U.S., besides exploring regional factors contributing to development and evolution of terrorism in the Middle Eater.

scholarly journals The Politics of Negotiating EU Readmission Agreements: Insights from Morocco and Turkey

2014 ◽  
Vol 16 (1) ◽  
pp. 69-95 ◽  
Author(s):  
Sarah Wolff
Keyword(s):  
Migration Policy ◽  
Irregular Migration ◽  
Similar Position ◽  
The Subject ◽  
Regional Factors ◽  
External Migration

Abstract The subject of this article is the politics of instrumentation of eu Readmission Agreement (eura) negotiations with Morocco and Turkey. Refusing to sign an eura for more than ten years, they share a similar position of ‘hard bargainers’. Recently though a ‘negotiation turn’ took place, Turkey initialling an eura in June 2012 and Morocco committing to sign an eura within the framework of a Mobility Partnership (mp) in June 2013. Unpacking the role of eu incentives and third countries’ preferences, this article reveals that beyond the function of this instrument to co-opt third countries in eu’s fight against irregular migration, a series of obstacles forced the eu to revise the design of eura and to take into account domestic and regional factors. This article engages with the meanings and representations carried by euras in third countries and implications for the logic of consequences and appropriateness within the framework of EU external migration policy.

scholarly journals A Plethora of Epigenetic Minerals Reveals a Multistage Metasomatic Overprint of a Mantle Orthopyroxenite from the Udachnaya Kimberlite

Minerals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 264
Author(s):  
Dmitriy I. Rezvukhin ◽  
Taisia A. Alifirova ◽  
Alexander V. Golovin ◽  
Andrey V. Korsakov
Keyword(s):  
Melt Inclusions ◽  
Kimberlite Pipe ◽  
Mantle Metasomatism ◽  
Crystal Chemical Formula ◽  
Mineral Inclusions ◽  
Reaction Zones ◽  
Geochemical Analyses ◽  
Individual Grains ◽  
Kimberlite Field ◽  
Intergranular Space

More than forty mineral species of epigenetic origin have been identified in an orthopyroxenite from the Udachnaya-East kimberlite pipe, Daldyn kimberlite field, Siberian platform. Epigenetic phases occur as: (1) Mineral inclusions in the rock-forming enstatite, (2) daughter minerals within large (up to 2 mm) crystallized melt inclusions (CMI) in the rock-forming enstatite, and (3) individual grains and intergrowths in the intergranular space of the xenolith. The studied minerals include silicates (olivine, clinopyroxene, phlogopite, tetraferriphlogopite, amphibole-supergroup minerals, serpentine-group minerals, talc), oxides (several generations of ilmenite and spinel, rutile, perovskite, rare titanates of the crichtonite, magnetoplumbite and hollandite groups), carbonates (calcite, dolomite), sulfides (pentlandite, djerfisherite, pyrrhotite), sulfate (barite), phosphates (apatite and phosphate with a suggested crystal-chemical formula Na2BaMg[PO4]2), oxyhydroxide (goethite), and hydroxyhalides (kuliginite, iowaite). The examined epigenetic minerals are interpreted to have crystallized at different time spans after the formation of the host rock. The genesis of minerals is ascribed to a series of processes metasomatically superimposed onto the orthopyroxenite, i.e., deep-seated mantle metasomatism, infiltration of a kimberlite-related melt and late post-emplacement hydrothermal alterations. The reaction of orthopyroxene with the kimberlite-related melt has led to orthopyroxene dissolution and formation of the CMI, the latter being surrounded by complex reaction zones and containing zoned olivine grains with extremely high-Mg# (up to 99) cores. This report highlights the utility of minerals present in minor volume proportions in deciphering the evolution and modification of mantle fragments sampled by kimberlitic and other deep-sourced magmas. The obtained results further imply that the whole-rock geochemical analyses of mantle-derived samples should be treated with care due to possible drastic contaminations from “hiding” minor phases of epigenetic origin.

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