Moduli and (un)attractor black hole thermodynamics

We investigate four-dimensional spherically symmetric black hole solutions in gravity theories with massless, neutral scalars non-minimally coupled to gauge fields. In the non-extremal case, we explicitly show that, under the variation of the moduli, the scalar charges appear in the first law of black hole thermodynamics. In the extremal limit, the near horizon geometry is $AdS_2\times S^2$ and the entropy does not depend on the values of moduli at infinity. We discuss the attractor behaviour by using Sen's entropy function formalism as well as the effective potential approach and their relation with the results previously obtained through special geometry method. We also argue that the attractor mechanism is at the basis of the matching between the microscopic and macroscopic entropies for the extremal non-BPS Kaluza-Klein black hole.Comment: 36 pages, no figures, V2: minor changes, misprints corrected, expanded references; V3: sections 4.3 and 4.5 added; V4: minor changes, matches the published versio

Study of the Effect of Mold Corner Shape on the Initial Solidification Behavior of Molten Steel Using Mold Simulator

The chamfered mold with a typical corner shape (angle between the chamfered face and hot face is 45 deg) was applied to the mold simulator study in this paper, and the results were compared with the previous results from a well-developed right-angle mold simulator system. The results suggested that the designed chamfered structure would increase the thermal resistance and weaken the two-dimensional heat transfer around the mold corner, causing the homogeneity of the mold surface temperatures and heat fluxes. In addition, the chamfered structure can decrease the fluctuation of the steel level and the liquid slag flow around the meniscus at mold corner. The cooling intensities at different longitudinal sections of shell are close to each other due to the similar time-average solidification factors, which are 2.392 mm/s1/2 (section A-A: chamfered center), 2.372 mm/s1/2 (section B-B: 135 deg corner), and 2.380 mm/s1/2 (section D-D: face), respectively. For the same oscillation mark (OM), the heights of OM roots at different positions (profile L1 (face), profile L2 (135 deg corner), and profile L3 (chamfered center)) are very close to each other. The average value of height difference (HD) between two OMs roots for L1 and L2 is 0.22 mm, and for L2 and L3 is 0.38 mm. Finally, with the help of metallographic examination, the shapes of different hooks were also discussed

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Not AvailableAn experiment was conducted for two years during rabi seasons of 2005-06 and 2006-07 to study the effect of fertigation on yield parameters and economic benefits of Ashwagandha. The treatments consist of three irrigation regimes (I1- Drip irrigation at 100% PE, I2- at 80% PE and I3-60% PE) and three fertility levels(F1 -100%, F2 – 75% and F3 - 50% of recommended dose of N,P,K) with a control having surface irrigation and soil application of fertilizer @30-20-20 kg N, P2O5 and K2O ha-1. The experimental soil was acidic in reaction and sandy loam in texture. Irrigating the crop at 80% PE with 100% recommended dose of fertilizer (RDF) produced the maximum root yield in comparison to other treatment combinations. Drip irrigation produced more root (795 kg ha-1) and seed (78 kg ha-1) yields. NPK uptake increased with an increase in the level of fertilizer. Application of irrigation at 80 % PE helped to absorb maximum amount of 43.41 kg N, 7.57 kg P and 31.95 kg K. Actual soil moisture content was comparatively higher in 100 % PE than 80% PE and 60%PENot Availabl

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Not AvailableA field experiment was conducted at the Central Research Farm of the Directorate of Water Management (Formerly WTCER) during 2006 and 2007 rabi (dry) seasons to study the effect of drip irrigation regimes and fertility levels on economics of mint (Mentha arvensis, L.) in rice based cropping system. The experiment was laid out in factorial randomized block design with three replications. The treatments consist of three irrigation regimes (I1 - drip irrigation at 100% pan evaporation (PE), I2 at 80% PE and I3 at 60% PE) with three fertility levels (F1 - 100%, F2 - 75% and F3 - 50% recommended dose of nitrogen, phosphorous and potassium, NPK) with an extra (control) treatment having surface irrigation and soil application of fertilizer. Irrigation to mint at 100% PE with recommended dose of fertilizer recorded 260 kg oil per hectare. Rice equivalent yield of mint was 13,800 kg ha-1. Drip-fertigation gave more gross, net return and benefit-cost ratio than surface irrigation. Irrigating the crop at 100% PE with 100% RD recorded highest net return of Rs. 80, 402 ha-1 in mint.Not Availabl

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Not AvailableAn experiment was conducted for two years during rabi seasons of 2005-06 and 2006-07 to study the effect of fertigation on yield parameters and economic benefits of Ashwagandha. The treatments consist of three irrigation regimes (I1-Drip irrigation at 100% PE, I2- at 80% PE and I3-60% PE) and three fertility levels(F1-100%, F2 – 75% and F - 50% of recommended dose of N,P,K) with a control having surface irrigation and soil application of fertilizer @30-20-20 kg N, P2O5and K2O ha-1. The experimental soil was acidic in reaction and sandy loam in texture. Irrigating the crop at 80% PE with 100% recommended dose of fertilizer (RDF) produced the maximum root yield in comparison to other treatment combinations. Drip irrigation produced more root (795 kg ha-1) and seed (78 kg ha-1) yields. NPK uptake increased with an increase in the level of fertilizer. Application of irrigation at 80 % PE helped to absorb maximum amount of 43.41 kg N, 7.57 kg P and 31.95 kg K. Actual soil moisture content was comparatively higher in 100 % PE than 80% PE and 60%PE.Not Availabl

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