Non-Existence of Five Dimensional Perfect Fluid Cosmological Model in Lyra Manifold     

G. Mohanty  K. L. Mahanta  R. R. Sahoo 《Astrophysics and Space Science》2006,306(4):269-272

In this paper we have taken an attempt to construct a five dimensional perfect fluid cosmological model within the framework of Lyra manifold. It is found that neither perfect fluid nor dust distributions survive. Finally the exact solutions of the vacuum field equations are obtained.  相似文献   

Bianchi type VI h perfect fluid cosmological model in f(R,T) theory     

B. Mishra  P. K. Sahoo 《Astrophysics and Space Science》2014,352(1):331-336

In this paper, we have investigated Bianchi type VI _h cosmological model filled with perfect fluid in the framework of f(R,T) gravity, where R is the Ricci scalar and T is the trace of the energy-momentum tensor proposed by Harko et al. (Phys. Rev. D 84:024020, 2011). We have obtained the cosmological models by solving the field equations. Some physical behaviors of the model are also studied.  相似文献   

Erratum to: Climate variability and change in mountain environments: some implications for water resources and water quality in the Sierra Nevada (USA)     

Mariza Costa-Cabral  Robert Coats  John Reuter  John Riverson  Goloka Sahoo  Geoffrey Schladow  Brent Wolfe  Sujoy B. Roy  Limin Chen 《Climatic change》2013,116(1):15-16

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The response of Lake Tahoe to climate change   总被引：2，自引：0，他引：2  

G. B. Sahoo  S. G. Schladow  J. E. Reuter  R. Coats  M. Dettinger  J. Riverson  B. Wolfe  M. Costa-Cabral 《Climatic change》2013,116(1):71-95

Meteorology is the driving force for lake internal heating, cooling, mixing, and circulation. Thus continued global warming will affect the lake thermal properties, water level, internal nutrient loading, nutrient cycling, food-web characteristics, fish-habitat, aquatic ecosystem, and other important features of lake limnology. Using a 1-D numerical model—the Lake Clarity Model (LCM) —together with the down-scaled climatic data of the two emissions scenarios (B1 and A2) of the Geophysical Fluid Dynamics Laboratory (GFDL) Global Circulation Model, we found that Lake Tahoe will likely cease to mix to the bottom after about 2060 for A2 scenario, with an annual mixing depth of less than 200 m as the most common value. Deep mixing, which currently occurs on average every 3–4 years, will (under the GFDL B1 scenario) occur only four times during 2061 to 2098. When the lake fails to completely mix, the bottom waters are not replenished with dissolved oxygen and eventually dissolved oxygen at these depths will be depleted to zero. When this occurs, soluble reactive phosphorus (SRP) and ammonium-nitrogen (both biostimulatory) are released from the deep sediments and contribute approximately 51 % and 14 % of the total SRP and dissolved inorganic nitrogen load, respectively. The lake model suggests that climate change will drive the lake surface level down below the natural rim after 2085 for the GFDL A2 but not the GFDL B1 scenario. The results indicate that continued climate changes could pose serious threats to the characteristics of the Lake that are most highly valued. Future water quality planning must take these results into account.  相似文献   

Projected 21st century trends in hydroclimatology of the Tahoe basin     

Robert Coats  Mariza Costa-Cabral  John Riverson  John Reuter  Goloka Sahoo  Geoffrey Schladow  Brent Wolfe 《Climatic change》2013,116(1):51-69

With down-scaled output from two General Circulation Models (the Geophysical Fluid Dynamics Laboratory, or GFDL, and the Parallel Climate Model, or PCM) and two emissions scenarios (A2 and B1), we project future trends in temperature and precipitation for the Tahoe basin. With the GFDL, we also project drought conditions and (through the use of a distributed hydrologic model) flood frequency. The steepest trend (GFDL with A2) indicates a 4–5°C warming by the end of the 21st century. Trends in annual precipitation are more modest with a dip in the latter half of the 21st century indicated by the GFDL/A2 case, but not the others. Comparisons with the Palmer Drought Severity Index show that drought will increase, in part due to the declining role of the snowpack as a reservoir for soil moisture replenishment. Analysis of flood frequency for the largest watershed in the basin indicates that the magnitude of the 100-yr flood could increase up to 2.5-fold for the middle third of the century, but decline thereafter as the climate warms and dries. These trends have major implications for the management of land and water resources in the Tahoe basin, as well as for design and maintenance of infrastructure.  相似文献   

Effects of climate change on thermal properties of lakes and reservoirs, and possible implications   总被引：3，自引：2，他引：1  

G. B. Sahoo  S. G. Schladow  J. E. Reuter  R. Coats 《Stochastic Environmental Research and Risk Assessment (SERRA)》2011,25(4):445-456

Meteorologic-driven processes exert large and diverse impacts on lakes’ internal heating, cooling, and mixing. Thus, continued global warming and climate change will affect lakes’ thermal properties, dynamics, and ecosystem. The impact of climate change on Lake Tahoe (in the states of California and Nevada in the United States) is investigated here, as a case study of climate change effects on the physical processes occurring within a lake. In the Tahoe basin, air temperature data show upward trends and streamflow trends indicate earlier snowmelt. Precipitation in the basin is shifting from snow to rain, and the frequency of intense rainfall events is increasing. In-lake water temperature records of the past 38 years (1970–2007) show that Lake Tahoe is warming at an average rate of 0.013°C/year. The future trends of weather variables, such as air temperature, precipitation, longwave radiation, downward shortwave radiation, and wind speed are estimated from predictions of three General Circulation Models (GCMs) for the period 2001–2100. Future trends of weather variables of each GCM are found to be different to those of the other GCMs. A series of simulation years into the future (2000–2040) is established using streamflows and associated loadings, and meteorologic data sets for the period 1994–2004. Future simulation years and trends of weather variables are selected so that: (1) future simulated warming trend would be consistent with the observed warming trend (0.013°C/year); and (2) future mixing pattern frequency would closely match with the historical mixing pattern frequency. Results of 40-year simulations show that the lake continues to become warmer and more stable, and mixing is reduced. Continued warming in the Tahoe has important implications for efforts towards managing biodiversity and maintaining clarity of the lake.  相似文献   

A note on new find of thick copper and associated precious metal mineralisation from Alwar basin of North Delhi Fold Belt, Rajasthan     

Israil Khan  Dinesh Kumar Rai  Prabodha Ranjan Sahoo 《Journal of the Geological Society of India》2013,82(5):495-498

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Naturally occurring radionuclides and rare earth elements in weathered Japanese soil samples     

Sarata K. Sahoo  Masahiro Hosoda  Ganesh Prasad  Hiroyuki Takahashi  Atsuyuki Sorimachi  Tetsuo Ishikawa  Shinji Tokonami  Shigeo Uchida 《Acta Geophysica》2013,61(4):876-885

The activity concentrations of ²²⁶Ra and ²²⁸Ac in weathered Japanese soils from two selected prefectures have been measured using a γ-ray spectroscopy system with high purity germanium detector. The uranium, thorium, and rare earth elements (REEs) concentrations were determined from the same soil samples using inductively coupled plasma mass spectrometry (ICP-MS). For example, granitic rocks contain higher amounts of U, Th, and light REEs compared to other igneous rocks such as basalt and andesites. Therefore, it is necessary to understand the interaction between REEs and nature of soils since soils are complex heterogeneous mixture of organic and inorganic solids, water, and gases. In this paper, we will discuss about distribution pattern of ²³⁸U and ²³²Th along with REEs in soil samples of weathered acid rock (granite) collected from two prefectures of Japan: Hiroshima and Miyagi.  相似文献   

An integro-differential equation approach to study the scattering of water waves by a floating flexible porous plate     

Santanu Koley  Trilochan Sahoo 《地球物理与天体物理流体动力学》2013,107(5):345-356

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Lower bound solutions for uplift capacity of strip anchors adjacent to sloping ground in clay     

Jagdish Prasad Sahoo  Sunil Khuntia 《Marine Georesources & Geotechnology》2018,36(4):405-416

Numerical solutions have been obtained for the vertical uplift capacity of strip plate anchors embedded adjacent to sloping ground in fully cohesive soil under undrained condition. The analysis was performed using finite element lower bound limit analysis with second-order conic optimization technique. The effect of anchor edge distance from the crest of slope, angle and height of slope, normalized overburden pressure due to soil self-weight, and embedded depth of anchor on the uplift capacity has been examined. A nondimensional uplift factor defined as F_cγ owing to the combined contribution of soil cohesion (c_u), and soil unit weight (γ) is used for expressing the uplift capacity. For an anchor buried near to a sloping ground, the ultimate uplift capacity is dependent on either pullout failure of anchor or overall slope failure. The magnitude of F_cγ has been found to increase with an increase in the normalized overburden pressure up to a certain maximum value, beyond which either the behavior of anchor transfers from shallow to deep anchor or overall slope failure occurs.  相似文献