300 research outputs found
Dr. Biplab Sarkar's Quick Files
No full textThe Quick Files feature was discontinued and it’s files were migrated into this Project on March 11, 2022. The file URL’s will still resolve properly, and the Quick Files logs are available in the Project’s Recent Activity
Dr. Biplab Sarkar's Quick Files
No full textThe Quick Files feature was discontinued and it’s files were migrated into this Project on March 11, 2022. The file URL’s will still resolve properly, and the Quick Files logs are available in the Project’s Recent Activity
Synthesis, characterization, crystal structure and DNA-binding study of four cadmium(II) pyridine-carboxamide complexes
No full textTreatment of perchlorate or nitrate salt of cadmium(II) with carboxamide derivatives (L) generated four novel mononuclear metal complexes, represented as [Cd(L )4](ClO4)2 (1a and 1b) and [Cd(L)2(ONO2)2] (2a and 2b) in appreciable yields (L = L1 = N-(furan-2-ylmethyl)-2-pyridine carboxamide and L = L2 = N-(thiophen-2-ylmethyl)-2-pyridine carboxamide). The complexes have been characterized by FT-IR, UV-Visible, elemental analysis and single crystal X-ray crystallographic analysis which revealed eight coordinated cadmium ions, but in different coordination environments, depending on the counter anion used. In addition, electronic absorption, fluorescence spectroscopy and viscosity measurements revealed a significant interaction of the four complexes with CT-DNA via intercalative/groove binding mode. The intrinsic binding constant Kb obtained varies from 0.4 × 10 4 to 1.11 × 10 5 M−1. The results suggest that neutral complexes 2a and 2b bind to DNA in an intercalative mode. On the other hand, cationic complexes 1a and 1b bind with DNA via weak electrostatic/covalent interaction
Dr. Biplab Sarkar's Quick Files
No full textThe Quick Files feature was discontinued and it’s files were migrated into this Project on March 11, 2022. The file URL’s will still resolve properly, and the Quick Files logs are available in the Project’s Recent Activity
Structural Adjustment, Global Trade and the New Political Economy of Development
Get PDFBiplab Dasgupta. Structural Adjustment Global Trade and the New Political Economy of Development. New Delhi. Sage Publications. 1998. Price Indian Rupees 450 (hardback). The author has written a very topical book the relevance of which cannot be understated. At the core of the book the author discusses the concept of the new political economy of development which forms the theoretical underpinnings that lie behind the structural adjustment/ stabilisation programmes of the international financial institutions such as the World Bank and the International Monetary Fund. Biplab Dasgupta has very concisely and succinctly analysed the new political economy of development which has, as its centre-piece, a blind faith in the operation of free-market forces. This can be traced back to the Reagan and Thatcher years, which saw a shift away from interventionist policies to allowing the markets to decide
Biplab Majumdar and His Poetry with Special Attention to Cosmic Convergence
Get PDFBiplab Majumdar is the author of nearly 100 books of poetry, prose, rhyme, translation, novels and short stories. His works are published both in Bengali and English. The contents of this latest volume, Cosmic Convergence, are divided into two parts: Part-A covers the year from January to December and Part-B contains 12 poems on a variety of subjects. The poems are followed by 3 pages of selected comments on Biplab Majumdar’s by a variety of eminent authors. This volume makes possible an assessment of the scope and stature of Majumdar’s work. These poems-often witty and beautiful- are an achievement, a testament to Majumdar’s ongoing power to engage us in his vision. They confirm Majumdar’s reputation as one of India’s finest poets. From evocations of the daily wonders of life to explorations of spirituality, feelings and sensibilities. His celebration of idiom and understanding of the modern mind may help us to understand ourselves
A rigorous approach to the formulation of extended Born‐Oppenheimer equation for a three‐state system
No full textIf a coupled three-state electronic manifold forms a sub-Hilbert space, it is possible to express the non-adiabatic coupling (NAC) elements in terms of adiabatic–diabatic transformation (ADT) angles. Consequently, we demonstrate: (a) Those explicit forms of the NAC terms satisfy the Curl conditions with non-zero Divergences; (b) The formulation of extended Born-Oppenheimer (EBO) equation for any three-state BO system is possible only when there exists coordinate independent ratio of the gradients for each pair of ADT angles leading to zero Curls at and around the conical intersection(s). With these analytic advancements, we formulate a rigorous EBO equation and explore its validity as well as necessity with respect to the approximate one (Sarkar and Adhikari, J Chem Phys 2006, 124, 074101) by performing numerical calculations on two different models constructed with different chosen forms of the NAC elements
Reference to: Chen YG, Li AC, Li WY, Huang MY, Li XB, Chen MQ, et al. The feasibility study of a hybrid coplanar arc technique versus hybrid intensity-modulated radiotherapy in treatment of early-stage left-sided breast cancer with simultaneous-integrated boost. J Med Phys 2017;42:1-8
No full textDerivative based sensitivity analysis of gamma index
No full textOriginally developed as a tool for patient-specific quality assurance in advanced treatment delivery methods to compare between measured and calculated dose distributions, the gamma index (γ) concept was later extended to compare between any two dose distributions. It takes into effect both the dose difference (DD) and distance-to-agreement (DTA) measurements in the comparison. Its strength lies in its capability to give a quantitative value for the analysis, unlike other methods. For every point on the reference curve, if there is at least one point in the evaluated curve that satisfies the pass criteria (e.g., δDD = 1%, δDTA = 1 mm), the point is included in the quantitative score as "pass." Gamma analysis does not account for the gradient of the evaluated curve - it looks at only the minimum gamma value, and if it is <1, then the point passes, no matter what the gradient of evaluated curve is. In this work, an attempt has been made to present a derivative-based method for the identification of dose gradient. A mathematically derived reference profile (RP) representing the penumbral region of 6 MV 10 cm × 10 cm field was generated from an error function. A general test profile (GTP) was created from this RP by introducing 1 mm distance error and 1% dose error at each point. This was considered as the first of the two evaluated curves. By its nature, this curve is a smooth curve and would satisfy the pass criteria for all points in it. The second evaluated profile was generated as a sawtooth test profile (STTP) which again would satisfy the pass criteria for every point on the RP. However, being a sawtooth curve, it is not a smooth one and would be obviously poor when compared with the smooth profile. Considering the smooth GTP as an acceptable profile when it passed the gamma pass criteria (1% DD and 1 mm DTA) against the RP, the first and second order derivatives of the DDs (δD', δD") between these two curves were derived and used as the boundary values for evaluating the STTP against the RP. Even though the STTP passed the simple gamma pass criteria, it was found failing at many locations when the derivatives were used as the boundary values. The proposed derivative-based method can identify a noisy curve and can prove to be a useful tool for improving the sensitivity of the gamma index
Development of p-channel GaN FETs on extremely-low doped p-GaN with Mg-diffused Ohmic contacts
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