Variability of Ice Conditions of the Bering Sea and Assessment of Their Possible Modeling

Oceanology - Various aspects of the seasonal and interannual variability of the sea ice cover are estimated based on all available Bering Sea ice data from 1960 to 2017. The possibility of...     

Dual high‐strength steel eccentrically braced frames with removable links

Structural damage in buildings designed according to the dissipative design philosophy can be significant, even under moderate earthquakes. Repair of damaged members is an expensive operation and may affect building use, which in turn increases the overall economic loss. If damage can be isolated to certain dissipative members realized to be removable following an earthquake, the repair costs and time of interruption of building use can be reduced. Dual structural configurations, composed of a rigid subsystem with removable ductile elements and a flexible subsystem, are shown to be appropriate for the application of removable dissipative element concept. Eccentrically braced frames with removable links connected to the beams using flush end‐plate bolted connections are investigated as a practical way of implementing this design concept. High‐strength steel is used for members outside links in order to enhance global seismic performance of the structure by constraining plastic deformations to removable links and reducing permanent drifts of the structure. Copyright © 2008 John Wiley & Sons, Ltd.     

SIDRA instrument for measurements of particle fluxes at satellite altitudes. Laboratory prototype

The design concept and first set of results are presented for electronic modules of a laboratory prototype of the small-size satellite instrument SIDRA intended for measurements of charged particle fluxes in outer space. The working prototype consists of a detector assembly based on high-purity silicon and fast scintillation detectors, modules of analogue and digital processing, and a secondary power supply module. The first results are discussed of a Monte-Carlo simulation of the instrument with the use of the GEANT4 toolkit and of measurements of the main parameters of charge-sensitive pre-amplifiers, shapers, and peak detectors. Results of calibration measurements with the use of radioactive sources and beams of accelerated charged particles are presented.     

Estimation of Sea Ice Drift on the Sea of Okhotsk Shelves Based on Satellite Data

The features of sea ice drift in the Sea ofOkhotsk are studied using Terra and Aqua satellite MODIS spectroradiometer data. The spatial heterogeneity of sea ice drift in the areas of hydrocarbon fields on the Magadan and Sakhalin shelves is analyzed.     

Zn-kupletskite and hendricksite in the agpaitic phonolites of the Oktyabrskii Massif,Azov region,Ukraine

Doklady Earth Sciences -     

Influence of the Amur River runoff on the hydrological conditions of the Amur Liman and Sakhalin Bay (Sea of Okhotsk) during the spring-summer flood

Hydrographic and satellite observation data obtained in June 2007 enabled to study the influence of the Amur River runoff on the hydrological conditions of the Amur Liman and the Sea of Okhotsk during the spring-summer flood. Salt waters from the Sea of Japan and fresh Amur River waters mix in the estuary (the Amur Liman). Freshened waters flow from the estuary into the Sea of Okhotsk as a jet-like flow drift, which forms a recirculating anticyclonic gyre in the Sakhalin Bay. The coastal current associated with the Amur River flow was obserwed near Sakhalin Island coast. The computed values of dynamic parameters (Kelvin number K=2, Froude number F = 0.4) showed that the Earth rotation and stratification are important factors in the dynamical balance of the Amur River plume during the spring-summer flood event.     

寒区隧道的路基稳定性维护

In cryolithozone conditions the control facilities a three-dimensional temperature mode of a place of crossing by the road embankment cross channel of various assignment for maintenance of structure stability are considered. The management is carried out through regulation by conditions of heat exchange on borders of a structure and in a ground massif. The software complex of thermal and mechanical behaviour computer modeling of structures considered class is created for the decision of control facilities designing tasks. The results of computing experiments show efficiency of application of such means, including as compensatory measures for maintenance of a considered structure stability at possible of a climate warming.     

The structure of the tidal mixing front in the region of Shantar Islands (Sea of Okhotsk) according to data of satellite observations

The location and seasonal variability of the tidal mixing front in the region of Shantar Islands are studied based on an analysis of satellite data. The Shantar tidal mixing front is related to the main features of the oceanographic structure of the northwestern shelf of the Sea of Okhotsk in summer. This front separates the coastal waters mixed by tidal currents and the stratified part of the shelf. The temperature tidal mixing front forms in July after the melting ice cover and disappears in the end of October when the stratification is broken. The mean position of the front changes insignificantly and is determined by the critical value of the Simpson-Hunter parameter (logh/u ₃ = 2.5); the front is located over the isobath of 50 m. The temperature tidal mixing front corresponds to the front in the distribution of chlorophyll a determined from SeaWiFS and MODIS satellite imagery. High (when compared to the stratified part of the shelf) concentrations of chlorophyll a were observed within the zone of intense tidal mixing. Satellite images in the IR range of the spectrum (Landsat-5 TM) demonstrated that the front is dynamically unstable. Mixing effects connected with frontal submesoscale baroclinic eddies have an influence on the structure of the stratified part of the shelf.