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排序方式: 共有118条查询结果,搜索用时 15 毫秒
1.
Lekshmi S Chattopadhyay Rajib Kaur Manpreet Joseph Susmitha Phani R. Dey A. Mandal R. Sahai A. K. 《Theoretical and Applied Climatology》2022,147(1-2):205-215
Theoretical and Applied Climatology - In the seamless forecast paradigm, it is hypothesized that the reduction in initial error in the dynamical model forecast would help to reduce forecast error... 相似文献
2.
Geophysical flows of practical interest encompass turbulent boundary layer flows. The velocity profile in turbulent flows
is generally described by a log- or a power-law applicable to certain zones of the boundary layer, or by wall-wake law for
the entire zone of the boundary layer. In this study, a novel theory is proposed from which the power-law velocity profile
is obtained for the turbulent boundary layer flow. The new power-law profile is based on the conservation of mass and the
skin friction within the boundary layer. From the proposed theory, analytical expressions for the power-law velocity profile
are presented, and their Reynolds-number dependency is highlighted. The velocity profile, skin friction coefficient and boundary
layer thickness obtained from the proposed theory are validated by the reliable experimental data for zero-pressure gradient
turbulent boundary layers. The expressions for Reynolds shear stress and eddy viscosity distributions across the boundary
layer are also obtained and validated by the experimental data. 相似文献
3.
Sudip Dey Sushmita Paul Chandrani Debbarma Prasamita Sarkar 《Journal of the Geological Society of India》2011,77(4):367-376
The present work concentrates on microstructure imaging for visualising the changes of depositional environment during Tertiary
period. For that purpose Tipam layers of Gajalia fold area in southern Tripura was selected which was deposited during late
Tertiary period under marine-coastal environment. Thin sections of eleven selected samples of the study area were prepared
in the laboratory for microstructure analysis. For visualising the crystalline particles or quartz brightness and contrast
of the image was increased up to maximum level. Surface conditions of the samples were analysed within RGB combination. The
grain size and shapes of the eleven samples tested prove that the depositional environment remained very dynamic through Tertiary
period in the study area. The microstructure and surface conditions also strongly support this view. 相似文献
4.
In Australia, Coal Seam Gas (CSG) is a relatively new source of natural gas commonly advocated as a lower greenhouse gas (GHG) emissions alternative to coal. This study investigates how GHG emissions have been, and potentially could be, assessed within the Australian CSG industry. The research involved a document analysis of several Environmental Impact Statements (EISs) and consultant reports prepared as part of the Environmental Impact Assessment (EIA) process for major CSG projects in New South Wales (NSW) and Queensland (Qld). There were found to be inconsistencies in the conduct of greenhouse assessment by the CSG industry, including how complete and transparent assessments were, as well as how effectively they addressed project emission intensity and cumulative impacts. There were also found to be large inconsistencies between assessments carried out for Qld projects and those for NSW projects, likely because of differences in how assessment requirements are applied by planning bodies. This study also highlights how alternative assessment approaches, such as Cumulative Impact Assessment (CIA) and Strategic Environmental Assessment (SEA), have potential to enable a broader and more consistent understanding of emission sources that cross a range of geographical and project boundaries. 相似文献
5.
Pushp R. Tiwari Sarat C. Kar Uma C. Mohanty Sagnik Dey Palash Sinha P. V. S. Raju M. S. Shekhar 《Acta Geophysica》2014,62(4):930-952
The performance of RegCM4 for seasonal-scale simulation of winter circulation and associated precipitation over the Western Himalayas (WH) is examined. The model simulates the circulation features and precipitation in three distinct precipitation years reasonably well. It is found that the RMSE decreases and correlation coefficient increases in the precipitation simulations with the increase of model horizontal resolutions. The ETS and POD for the simulated precipitation also indicate that the performance of model is better at 30 km resolution than at 60 and 90 km resolutions. This improvement comes due to better representation of orography in the high-resolution model in which sharp orography gradient in the domain plays an important role in wintertime precipitation processes. A comparison of model-simulated precipitation with observed precipitation at 17 station locations has been carried out. Overall, the results suggest that 30 km model produced better skill in simulating the precipitation over the WH and this model is a useful tool for further regional downscaling studies. 相似文献
6.
Manjari Bagchi Rachid Ouyed Jan Staff Subharthi Ray Mira Dey † Jishnu Dey ‡ 《Monthly notices of the Royal Astronomical Society》2008,387(1):115-120
We study the effects of temperature on strange stars. It is found that the maximum mass of the star decreases with the increase of temperature, as at high temperatures the equations of state become softer. Moreover, if the temperature of a strange star increases, keeping its baryon number fixed, its gravitational mass increases and its radius decreases. This leads to a limiting temperature, where it turns into a black hole. These features are the result of a combined effect of the change of gluon mass and the quark distribution with temperature. We report on a new type of radial oscillation of strange stars, driven by what we call 'chromothermal' instability. We also discuss the relevance of our findings in the astrophysics of core collapse supernovae and gamma-ray bursts. 相似文献
7.
Bioturbation is a typically small scale yet potentially significant geological process altering rock properties by reworking. For many years, bioturbation studies found application in exploration geology to estimate paleobathymetry, interpreting depositional environment and identifying key stratigraphic surfaces. These act as vital inputs to the geological models, for determination of source rock potential, reservoir quality and modeling of petroleum systems. Recently geologists extended the application of bioturbation studies to address production related challenges. Recognizing the bioturbation effects and incorporating them in reservoir simulation models can improve production predictions and enhanced oil recovery operations. This paper discusses bioturbation and its effects on reservoir quality, its performance and production. 相似文献
8.
Joyjit Dey R Jayangonda Perumal Subham Sarkar Anamitra Bhowmik 《Journal of Earth System Science》2017,126(6):83
In the NW Sub-Himalayan frontal thrust belt in India, seismic interpretation of subsurface geometry of the Kangra and Dehradun re-entrant mismatch with the previously proposed models. These procedures lack direct quantitative measurement on the seismic profile required for subsurface structural architecture. Here we use a predictive angular function for establishing quantitative geometric relationships between fault and fold shapes with ‘Distance–displacement method’ (D–d method). It is a prognostic straightforward mechanism to probe the possible structural network from a seismic profile. Two seismic profiles Kangra-2 and Kangra-4 of Kangra re-entrant, Himachal Pradesh (India), are investigated for the fault-related folds associated with the Balh and Paror anticlines. For Paror anticline, the final cut-off angle \(\beta =35{^{\circ }}\) was obtained by transforming the seismic time profile into depth profile to corroborate the interpreted structures. Also, the estimated shortening along the Jawalamukhi Thrust and Jhor Fault, lying between the Himalayan Frontal Thrust (HFT) and the Main Boundary Thrust (MBT) in the frontal fold-thrust belt, were found to be 6.06 and 0.25 km, respectively. Lastly, the geometric method of fold-fault relationship has been exercised to document the existence of a fault-bend fold above the Himalayan Frontal Thrust (HFT). Measurement of shortening along the fault plane is employed as an ancillary tool to prove the multi-bending geometry of the blind thrust of the Dehradun re-entrant. 相似文献
9.
Himadri Bhusan Sahoo Subhasish Tripathy Sk. Md. Equeenuddin Prafulla Kumar Sahoo 《Environmental Earth Sciences》2014,72(1):243-250
The ability of ochre to remove Pb(II) and Cu(II) from aqueous media has been studied by batch sorption studies varying the contact time, initial metal concentration, initial solution pH and temperature to understand the adsorption behaviour of these metals through adsorption kinetics and isotherms. The pH of the solution and the temperature controlled the adsorption of metal ions by ochre and rapid uptake occurred in the first 30 min of reaction. The kinetics of adsorption followed a pseudo-second-order rate equation (R 2 > 0.99) and the isotherms are well described by the Freundlich model. Adsorption of metals onto ochre is endothermic in nature. Between the two metals, Pb(II) showed more preference towards the exchangeable sites on ochre than Cu(II). This study indicates that ochre is a very effective adsorbent in removing Pb(II) and Cu(II) from the aqueous environment with an adsorptive capacity of 0.996 and 0.628 mg g?1 and removal efficiency of 99.68 and 62.80 %, respectively. 相似文献
10.
One interesting method of constraining the dense matter Equations of State is to measure the advancement of the periastron of the orbit of a binary radio pulsar (when it belongs to a double neutron star system). There is a great deal of interest on applicability of this procedure to the double pulsar system PSR J0737-3039 (A/B). Although the above method can be applied to PSR A in future within some limitations, for PSR B this method cannot be applied. On the other hand, the study of genesis of PSR B might be useful in this connection and its low mass might be an indication that it could be a strange star. 相似文献