Tapas Kumar Pal

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Symmetric Key Cryptography is one of the prominent means of secure data transfer through unreliable channel. It requires less overhead than Public Key Cryptosystem. We present here, a new algorithm based on 2-d geometry using property of circle, and circle-centered angle. It is a block cipher technique but has the advantage of producing fixed size encrypted(More)
Three different forms of casts are produced by earthworm species of rubber plantation. These are tower-like casts (Metaphire houlleti, Eutyphoeus gammiei, Eutyphoeus gigas, Eutyphoeus scutarius, Eutyphoeus assamensis, Eutyphoeus callosus, Eutyphoeus comillahnus, Eutyphoeus turaensis, Eutyphoeus sp.), composite irregular casts (Pontoscolex corethrurus,(More)
The objective of the study was to develop and characterize Diclofenac Diethylamine (DDEA) transdermal patch using Silicone and acrylic adhesives combination. Modified solvent evaporation method was employed for casting of film over Fluoropolymer coated polyester release liner. Initial studies included solubilization of drug in the polymers using(More)
This study describes development and subsequent validation of a reversed phase high performance liquid chromatographic (RP-HPLC) method for the estimation of ursodeoxycholic acid used to solubilize cholesterol gallstones, in conventional tablet dosage formulation and in prepared dosage form. The chromatographic system was achieved in a BDS Hypersil C8(More)
A coherent study of tuning properties of resonant-cap IMPATT oscillator at Ka-band has been carried out by mechanical and electronic means. It is experimentally observed that output power of IMPATT oscillator passes through a maximum, with an optimum combination of cap diameter and cap height. An empirical relation is obtained between cap diameter and(More)
The device efficiency of a silicon SDR (p + nn +) IMPATT diode at Ka-band has been studied by using small signal simulation and field swing upto 50 % of the maximum dc electric field. It is found that the d.c. to r.f. conversion efficiency of the SDR IMPATT diode decreases with the increase in field swing upto 50 %, from 8.98% to 7.84%. An integrated heat(More)
Sulphamethoxazole and trimethoprim are separately microencapsulated with polyacrylic resin: Eudragit RS 100. The data so obtained from the drug release have been analyzed according to the different existing kinetic models (1) Zero order (2) First order and (3) Higuchi Matrix Kinetics. It is observed that in both the cases of single component and binary(More)
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