On the Attractive Force of an Elliptical Gaussian Ring     

Vashkov’yak  M. A. 《Solar System Research》2021,55(5):467-474

Solar System Research - A numerical-analytical method for analyzing the orbital evolution of a planetary satellite under the influence of a perturbing body moving in an elliptical orbit is...  相似文献   

Evaluating the Diffuse Runoff from Urban Territories in the Volga Basin: Case Study of Rostov City     

Bolgov  M. V.  Zav’yalova  E. V.  Zaitseva  A. V.  Osipova  N. V. 《Water Resources》2020,47(5):673-681

Water Resources - The study is focused on examining and simulating the formation processes of the runoff and pollution export in the case of Rostov (Rostov Velikii), a town in the Volga basin. The...  相似文献   

Runoff response of a small agricultural basin in the argentine Pampas considering connectivity aspects     

María Guadalupe Ares  Marcelo Varni  Celio Chagas 《水文研究》2020,34(14):3102-3119

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Assessment of the influence of horizontal diaphragms on the seismic performance of vernacular buildings     

Javier Ortega  Graça Vasconcelos  Hugo Rodrigues  Mariana Correia 《Bulletin of Earthquake Engineering》2018,16(9):3871-3904

The awareness and preservation of the vernacular heritage and traditional construction techniques and materials is crucial as a key element of cultural identity. However, vernacular architecture located in earthquake prone areas can show a particularly poor seismic performance because of inadequate construction practices resulting from economic restraints and lack of resources. The horizontal diaphragms are one of the key aspects influencing the seismic behavior of buildings because of their major role transmitting the seismic actions to the vertical resisting elements of the structure. This paper presents a numerical parametric study adopted to understand the seismic behavior and resisting mechanisms of vernacular buildings according to the type of horizontal diaphragm considered. Detailed finite element modeling and nonlinear static (pushover) analyses were used to perform the thorough parametric study aimed at the evaluation and quantification of the influence of the type of diaphragm in the seismic behavior of vernacular buildings. The reference models used for this study simulate representative rammed earth and stone masonry vernacular buildings commonly found in the South of Portugal. Therefore, this paper also contributes for a better insight of the structural behavior of vernacular earthen and stone masonry typologies under seismic loading.  相似文献   

Equilibrium modeling of the beach profile on a macrotidal embayed low tide terrace beach     

Clara Lemos  France Floc’h  Marissa Yates  Nicolas Le Dantec  Vincent Marieu  Klervi Hamon  Véronique Cuq  Serge Suanez  Christophe Delacourt 《Ocean Dynamics》2018,68(9):1207-1220

Eleven-year long time series of monthly beach profile surveys and hourly incident wave conditions are analyzed for a macrotidal Low Tide Terrace beach. The lower intertidal zone of the beach has a pluriannual cycle, whereas the upper beach profile has a predominantly seasonal cycle. An equilibrium model is applied to study the variation of the contour elevation positions in the intertidal zone as a function of the wave energy, wave power, and water level. When forcing the model with wave energy, the predictive ability of the equilibrium model is around 60% in the upper intertidal zone but decreases to 40% in the lower intertidal zone. Using wave power increases the predictive ability up to 70% in both the upper and lower intertidal zones. However, changes around the inflection point are not well predicted. The equilibrium model is then extended to take into account the effects of the tide level. The initial results do not show an increase in the predictive capacity of the model, but do allow the model free parameters to represent more accurately the values expected in a macrotidal environment. This allows comparing the empirical model calibration in different tidal environment. The interpretation of the model free parameter variation across the intertidal zone highlights the behavior of the different zones along the intertidal beach profile. This contributes to a global interpretation of the four model parameters for beaches with different tidal ranges, and therefore to a global model applicable at a wide variety sites.  相似文献   

Structure of Prominences with Normal and Inverse Polarities     

Korolkova  O. A.  Solov’ev  A. A. 《Geomagnetism and Aeronomy》2019,59(7):858-863

Geomagnetism and Aeronomy - Based on the measurements of their magnetic fields, solar prominences can be divided into two types: filaments with normal (N) or inverse (I) polarity. In an N-type...  相似文献   

Solar System Collisions with Dense Interstellar Gas Clouds and Radiocarbon Traces of Periods with “Abnormally Low” Solar Modulation of Cosmic Rays     

Vasil’ev  G. I.  Konstantinov  A. N.  Kudryavtsev  I. V.  Ogurtsov  M. G.  Ostryakov  V. M.  Pavlov  A. K.  Frolov  D. A. 《Geomagnetism and Aeronomy》2019,59(8):1075-1080

Geomagnetism and Aeronomy - The causes of a sharp increase in the radiocarbon content in the Earth’s atmosphere for periods with abnormally low solar modulation of galactic cosmic rays (GCRs)...  相似文献   

Changes in the Period of Negative Superhumps of Type SU UMa Dwarf Novae. II. NY Her (2017 and 2020)     

Pavlenko  E. P.  Sosnovskii  A. A.  Antonyuk  K. A.  Antonyuk  O. I.  Pit’  N. V.  Kokhirova  G. I.  Rakhmatullaeva  F. J.  Baklanov  A. V. 《Astrophysics》2021,64(3):293-305

Astrophysics - Photometric studies of the type SU UMa dwarf nova NY Her were made during 2017 and 2020 at the Crimean Astrophysical Observatory and at the Sanglokh Observatory over a total of 77...  相似文献   

Estimation of the Ionospheric Effects of Geomagnetic Disturbances Based on Data from Wakkanai Station     

Legen’ka  A. D.  Khegai  V. V. 《Geomagnetism and Aeronomy》2020,60(5):577-585

Geomagnetism and Aeronomy - Ionosonde measurements of the critical frequency of the ionospheric F2 layer (foF2) at Wakkanai station (Japan) are analyzed with the method of superposed epochs. The...  相似文献   

Effects of intensive aquifers exploitation on groundwater salinity in coastal wetlands     

Malva Mancuso  Lucía Santucci  Eleonora Carol 《水文研究》2020,34(11):2313-2323

The coastal plain of the Río de la Plata constitutes a large wetland which develops on the right margin of the river estuary. Anthropic activities such as intensive exploitation of groundwater carried out in the vicinity of the wetland can modify the natural hydrological regime. The aim of this work is to asses the effects of intensive aquifer exploitation in coastal wetlands using hydrogeological models. Such models allow to evaluate changes in the environmental conditions of wetland at regional level. The hydrogeological model exposed in this work shows how the intensive groundwater exploitation affects the wetland area, generating important variations both in the groundwater flows and in the salinity of the groundwater. Identification of these modifications to the environment is important to generate guidelines leading to minimize these affectations.  相似文献