Variations of modal composition of granitic rocks in some regions around the pacific     

Adrew B. Vistelius  D. N. Ivanov  Yochimasa Kuroda  Carlos Ruiz Fuller 《Mathematical Geology》1970,2(1):63-80

Granitic rocks from the Andes and from Japan, Kurile Islands, and Kamchatka have been investigated in their modal composition determined. Principal components analysis of the data reveals that there is three main factors influencing variation of modal composition of rocks that can be interpreted in forms of petrological processes. There is a similarity in results of the investigation of rocks from Japan, Kamchatka, and Andean regions.  相似文献   

Cosmic-ray energetics in the supernova remnant Cassiopeia A     

K. S. Stankevich  V. P. Ivanov 《Astronomy Letters》2001,27(5):292-296

Based on the observed radio spectrum for the supernova remnant Cassiopeia A, we have established that it represents synchrotron radiation of relativistic electrons with a nonpower-law energy spectrum in the form of Kaplan-Tsytovich’s standard distribution. The total density of relativistic electrons is 10^?3 cm^?3, only 20% of which form the radio spectrum. The particle number ratio of the proton-nuclear and electron cosmicray components inside the shell differs significantly from the mean Galactic ratio (100) and probably does not exceed unity.  相似文献   

Possibility of convective energy exchange between the components of a contact binary system     

L. N. Ivanov 《Astrophysics》1976,12(3):311-317

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Information about the Sixth Baltic Stratigraphic Conference, August 23–25, 2005, St. Petersburg     

T. N. Koren’  A. V. Dronov  I. Yu. Evdokimova  A. V. Zhuravlev  A. O. Ivanov  O. L. Kossovaya  Yu. V. Savitsky  T. Yu. Tolmacheva 《Stratigraphy and Geological Correlation》2006,14(4):458-460

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The effect of gross primary production, net primary production and net ecosystem exchange on the carbon fixation by chemical weathering of basalt in northeastern Iceland     

Marin Ivanov Kardjilov  Sigurdur Reynir Gíslason  Gudrún Gísladttir 《Journal of Geochemical Exploration》2006,88(1-3):292

The overall objective of this study is to define and interpret the annual dissolved inorganic carbon (DIC) flux in selected river catchments in North Eastern Iceland. The flux stems primarily from chemical weathering of basalt. The DIC flux out of the catchments is compared with the spatial distribution of the various vegetation communities and their gross primary production (GPP), net primary production (NPP) and net ecosystem exchange (NEE). There is no correlation between the DIC flux and the GPP, but one between DIC and NPP. The DIC flux is highly dependent on the NEE, which in turn is governed by the area extent of wetlands in these catchments. A variation by a factor 5 of the NEE results in a variation by a factor 2.8 in the river dissolved inorganic flux.  相似文献   

Major episodes of geologic history of Isidis Planitia on Mars     

M.A. Ivanov  H. Hiesinger  G. Erkeling  F.J. Hielscher  D. Reiss 《Icarus》2012,218(1):24-46

We have mapped the area of Isidis Planitia (1–27°N, 75–103°E) in order to assess the geologic history of this region using modern data sets such as MOLA topography and the high-resolution images provided by the HRSC, CTX, and HiRISE cameras. Results of our mapping show that the geologic history of Isidis Planitia consists of three principal episodes. (1) Impact dominated episode (Noachian, until ～3.8 Ga): During this time, the oldest materials in the study area were formed mostly by impact reworking and mass-wasting. Other processes (e.g., volcanism and fluvial/glacial activity) likely operated at this time but played a subordinate role. (2) An episode related to volcanic and fluvial/glacial activities (late Noachian–early Amazonian, ～3.8–2.8 Ga): Volcanism appears as the most important process at the beginning of this episode (～3.8–3.5 Ga) and was responsible for the formation of a large circum-Isidis volcanic province by the early Hesperian epoch. Volcanic materials covered large portions of the Isidis rim, almost completely buried the previous crater record on the floor of the Isidis basin, and probably were the major contributors to the filling of the basin. Fluvial/glacial processes prevailed closer to the end of the episode (early Hesperian–early Amazonian, ～3.5–2.8 Ga) and were responsible for widespread resurfacing in the Isidis Planitia region, mostly at ～3.1–3.4 Ga. Glaciers and/or ice sheets probably resulted in a massive glaciation of the rim and the floor of the Isidis basin. The total volume of material eroded from the Isidis rim by glacial and fluvial activity is estimated to be about 35,000–50,000 km³, which is equivalent to a composite layer about 40–60 m thick on entire floor of the basin. More important, however, is that the eroded materials were likely saturated with ice/water and could form wet deposits on the floor. (3) Wind-dominated episode (since early Amazonian, ～2.8 Ga): Wind activity dominated the later geologic history of Isidis Planitia but resulted only in minor modification of the surface.  相似文献   

Coronal Mass Ejections and the Index of Effective Solar Multipole     

V. N. Obridko  E. V. Ivanov  A. ?zgü?  A. Kilcik  V. B. Yurchyshyn 《Solar physics》2012,281(2):779-792

The paper considers the relationship between the cyclic variations in the velocity of coronal mass ejections (CME) and the large-scale magnetic field structure (LSMF) in cycles 21??C?23. To characterize a typical size of the LSMF structure, we have used the index of the effective solar multipole (ESMI). The cyclic behavior of the CME occurrence rate and velocity proved to be similar to that of ESMI. The hysteresis observed in variations of the CME maximum velocity is interpreted as a manifestation of different contributions from the two field structures (local and global magnetic fields) in different phases of the 11-year activity cycle. It is suggested that cyclic variations in the maximum velocity of coronal mass ejections are due to different conditions for the formation of the complexes of active regions connected by coronal arch systems, which are the main source of high-velocity CMEs.  相似文献   

Carbonate–Alkaline Metasomatites of the Peschanoe Uranium Occur (Western Baikal Region): Mineral-Geochemical and Isotope-Geochemical Characteristics     

Savelyeva  V. B.  Bazarova  E. P.  Demonterova  E. I.  Ivanov  A. V. 《Geology of Ore Deposits》2021,63(1):54-78

Geology of Ore Deposits - Abstract—Metasomatic alterations in cataclased granites of the Primorsky Complex PR1 in the Southern Siberian Craton are represented by albitization and...  相似文献   

Vertical Mixing in the Active Layer of the Black Sea     

V. A. Ivanov  A. N. Morozov 《Doklady Earth Sciences》2018,482(2):1328-1330

The averaged parameters of vertical turbulent mixing in the active layer of the Black Sea are discussed according to small-scale synchronous measurements of the profiles of current velocity and conditional density.  相似文献   

A Tidal Semidiurnal Harmonic in the Black Sea Dynamics according to Numerical Modeling Results     

V. A. Ivanov  V. B. Zalesny  A. N. Lukyanova  A. V. Bagaev 《Doklady Earth Sciences》2018,480(1):607-610

The parameters of barotropic and baroclinic oscillations in the subinertial range have been obtained by numerical simulations of the Black Sea circulation using a model developed at the Marchuk Institute of Numerical Mathematics, Russian Academy of Sciences. The structures and periods of barotropic and baroclinic seiches are in good agreement with the known theoretical predictions and results of numerical modeling of seiches obtained for the Black Sea subbasins.  相似文献