Quantitative interpretation of self-potential anomalies due to spherical ore bodies     

Virendra Mohan  Randhir Singh 《Pure and Applied Geophysics》1972,96(1):134-139

Summary A quantitative method of interpreting self-potential anomaly caused by a spherical ore body using downward continuation method is presented. Master curves to determine the depth, radius and angle of polarization have been prepared.  相似文献   

Is India pulling its weight? India’s nationally determined contribution and future energy plans in global climate policy     

Aniruddh Mohan  Timon Wehnert 《Climate Policy》2019,19(3):275-282

Ahead of the Conference of Parties (COP) 24 where countries will first take stock of climate action post Paris, this paper assesses India’s progress on its nationally determined contribution (NDC) targets and future energy plans. We find that, although India is well on track to meet its NDC pledges, these targets were extremely modest given previous context. Furthermore, there is considerable uncertainty around India’s energy policy post 2030 and if current plans for energy futures materialise, the Paris Agreement’s 2 degrees goal will be almost certainly unachievable. India’s role in international climate politics has shifted from obstructionism to leadership particularly following the announcement of withdrawal by the United States from the Paris Agreement, but analysis reveals that India’s ‘hard’ actions on the domestic front are inconsistent with its ‘soft’ actions in the international climate policy arena. Going forward, India is likely to face increasing calls for stronger mitigation action and we suggest that this gap can be bridged by strengthening the links between India’s foreign policy ambitions, international climate commitments, and domestic energy realities.

Key policy insights

• India’s NDC pledges on carbon intensity and share of non-fossil fuel capacity are relatively modest given domestic context and offer plenty of room to increase ambition of action.

• India’s ‘soft’ leadership in global climate policy can be matched by ‘hard’ commitments by bringing NDC pledges in line with domestic policy realities.

• There is significant uncertainty around future plans for coal power in India which have the potential to exceed the remaining global carbon budget for 2 degrees.

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Bi‐Solute Sorption of Estrogens at Low Concentration: Two‐ and Three‐Parametric Analysis     

A. Kiran Kumar  P. Suresh Babu  S. Venkata Mohan 《洁净——土壤、空气、水》2012,40(11):1236-1243

Competitive sorption of estriol (E3) and 17α‐ethinylestradiol (EE2) was studied on activated charcoal. Better sorption of E3 (88.9%) and EE2 (69.5%) was observed with single‐solute sorption system than with bi‐solute sorption system. Single‐solute sorption kinetics of E3 and EE2 were evaluated with two (Langmuir and Freundlich) and three (dual mode and Song) parameter models. Freundlich model (R², 0.9915 (E3); 0.9875 (EE2)) showed good prediction compared to other models for single‐solute sorption. Adsorption capacity documented reduced efficacy (86.4% (E3); 65.9% (EE2)) due to induced competitive behavior between the estrogens in aqueous phase. Bi‐solute adsorption kinetics of E3 and EE2 were described by IAST with two and three parameter models. Among these models, IAST‐Freundlich model (R², 0.9765 (E3); 0.9985 (EE2)) was best in predicting bi‐solute sorption of E3 and EE2 by activated charcoal. All these models showed favorable representation of both single‐ and bi‐solute sorption behaviors.  相似文献   

Bioremediation Potential of Arthrospira platensis (Spirulina) against Chromium(VI)          下载免费PDF全文

Sundaramoorthy Balaji  Thiagarajan Kalaivani  Chandrasekaran Rajasekaran  Ramamoorthy Siva  Mohan Shalini  Ranjan Das  Varun Madnokar  Prajakta Dhamorikar 《洁净——土壤、空气、水》2015,43(7):1018-1024

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Evaluation of the Soil Conservation Service curve number methodology using data from agricultural plots   总被引：1，自引：0，他引：1  

Mohan Lal  S. K. Mishra  Ashish Pandey  R. P. Pandey  P. K. Meena  Anubhav Chaudhary  Ranjit Kumar Jha  Ajit Kumar Shreevastava  Yogendra Kumar 《Hydrogeology Journal》2017,25(1):151-167

The Soil Conservation Service curve number (SCS-CN) method, also known as the Natural Resources Conservation Service curve number (NRCS-CN) method, is popular for computing the volume of direct surface runoff for a given rainfall event. The performance of the SCS-CN method, based on large rainfall (P) and runoff (Q) datasets of United States watersheds, is evaluated using a large dataset of natural storm events from 27 agricultural plots in India. On the whole, the CN estimates from the National Engineering Handbook (chapter 4) tables do not match those derived from the observed P and Q datasets. As a result, the runoff prediction using former CNs was poor for the data of 22 (out of 24) plots. However, the match was little better for higher CN values, consistent with the general notion that the existing SCS-CN method performs better for high rainfall–runoff (high CN) events. Infiltration capacity (fc) was the main explanatory variable for runoff (or CN) production in study plots as it exhibited the expected inverse relationship between CN and fc. The plot-data optimization yielded initial abstraction coefficient (λ) values from 0 to 0.659 for the ordered dataset and 0 to 0.208 for the natural dataset (with 0 as the most frequent value). Mean and median λ values were, respectively, 0.030 and 0 for the natural rainfall–runoff dataset and 0.108 and 0 for the ordered rainfall–runoff dataset. Runoff estimation was very sensitive to λ and it improved consistently as λ changed from 0.2 to 0.03.  相似文献   

Africa, China and the 'new' economic geography of development   总被引：6，自引：5，他引：1  

Giles Mohan  Marcus Power 《Singapore journal of tropical geography》2009,30(1):24-28

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Metamorphism and Isotopic Evolution of Granulites of Southern India: Reference to Neoproterozoic Crustal Evolution     

A. Mohan  M. Jayananda 《Gondwana Research》1999,2(2):251

Granulites are important component of high-grade metamorphic rocks reflecting intense conditions observed for crustal rocks in terms of temperature, and pressure. This review paper demonstrates how these high-grade granulites are critical to understanding the evolution of the lower continental crust with special reference to southern India. Geothermobarometric traverse across different granulite blocks in southern India shows wide ranging P-T conditions of metamorphism (700–1000 ° C, and 5–10 kbar). The sapphirine-, orthopyroxene-sillimanite, and spinel -bearing quartz-deficient granulites recognised from parts of southern granulite terrain (Ganguvarpatti, Kiranur, and Palani hill ranges etc.) show oriented sillimanite aggregates pseudomorph after course twinned kyanite, staurolite + kyanite assemblages, and corroded blebs of gedrite within orthopyroxene, suggesting a prograde stage of a clockwise P-T evolution. Evidence of ITD history comes from the textures in which an early Mg-rich garnet (X_Mg 52–60) with orthopyroxene (up to 10% Al₂O₃) involving sillimanite breakdown forming variety of symplectites having combinations of orthopyroxene, sapphirine, cordierite, and spinel. These spectacular reaction textures, and mineralogic sensors from the high-grade rocks establish a prograde clockwise P-T-t path with notable decompressive history (ITD) in the southern granulite terrain. The inferred P-T-t paths have been further integrated with the recent geochronological, and isotopic data to constrain the timing, and duration of metamorphism, emplacement of the magmatic protolith for characterising the evolution of the granulites, and their bearing on the geodynamic implications. Based on the emerging evidence for Neoproterozoic tectonothermal imprints in the southern granulite terrain, history of the assembly of dispersed fragments is also addressed within the East Gondwana framework.  相似文献   

Denitrification Kinetics of High‐Strength Nitrate in Granular Sludge Reactors          下载免费PDF全文

Tulasi V. Krishna Mohan  Yarlagadda V. Nancharaiah  Vayalam P. Venugopalan  Pedapati M. Satya Sai 《洁净——土壤、空气、水》2018,46(8)

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Paleoclimatic and diagenetic history of the late quaternary sediments in a core from the Southeastern Arabian Sea: Geochemical and magnetic signals     

Venigalla Purnachandra Rao  Pratima Mohan Kessarkar  Meloth Thamban  Shiva Kumar Patil 《Journal of Oceanography》2010,66(1):133-146

Geochemical and rock-magnetic investigations were carried out on a sediment core collected from the SE Arabian Sea at 1420 m depth in oxygenated waters below the present-day oxygen minimum zone. The top 250 cm of the core sediments represent the last 35 kaBP. The · ¹⁸O values of Globigerinoides ruber are heaviest during the Last Glacial Maximum (LGM) and appear unaffected by low-saline waters transported from the Bay of Bengal by the strong northeast monsoon and West Indian coastal current. The signatures of Bølling-Allerød and Younger Dryas events are distinct in the records of magnetic susceptibility, organic carbon (OC) and · ¹⁸O. Glacial sediments show higher OC, CaCO₃, Ba, Mo, U and Cd, while the early-to-late Holocene sediments show increasing concentrations of OC, CaCO₃, Ba, Cu, Ni and Zn and decreasing concentrations of Mo, U and Cd. Productivity induced low-oxygenated bottom waters and reducing sedimentary conditions during glaciation, and productivity and oxygenated bottom waters in the Holocene are responsible for their variation. The core exhibits different stages of diagenesis at different sediment intervals. The occurrence of fine-grained, low-coercivity, ferrimagnetic mineral during glacial periods is indicative of its formation in organic-rich, anoxic sediments, which may be analogous to the diagenetic magnetic enhancement known in sapropels of the Mediterranean Sea and Japan Sea. The glacial sediments exhibiting reductive diagenesis with anoxic sedimentary environment in this core correspond to reductive diagenesis and intermittent bioturbation (oxygenation) reported in another core in the vicinity. This suggests that the poorly oxygenated bottom water conditions during glacial times should not be generalized, but are influenced locally by productivity, sedimentation rates and sediment reworking.  相似文献   

Inter-comparison of model-predicted wave heights with satellite altimeter measurements in the north Indian Ocean   总被引：1，自引：0，他引：1  

Abhijit Sarkar  M. Mohan  Raj Kumar 《Ocean Engineering》1997,24(9):879-885

A numerical model based on a wind-wave energy transport formulation of Toba is developed to generate hindcast wave height data for the equatorial and the north Indian Ocean, which is otherwise a data-sparse region. The intercomparison between model-predicted wave heights for three years (1987–1989) obtained utilising analysed surface wind fields' data, and model grid averaged GEOSAT Altimeter significant wave height data showed moderate match, particularly for H_S greater than 1 m.  相似文献