Arindom Banerjee

Discriminant Function Analysis of Mastoid Measurements in Sex Determination

Abstract The purpose of this study was to develop a new standard for determination of sex of fragmentary human skeletal remains, using the mastoid process. It also attempts to assign rank to the commonly measured parameters of mastoid with regards to their sex discriminatory power. Logistic regression was also applied on mastoid variables to validate the results of discriminant functional analysis. The sample study (70 adult macerated skulls with known sex, 35 each male and female) was drawn from the Department of Anatomy and Forensic Medicine, Konaseema Institute of Medical sciences and Research Foundation, Amalapuram. Discriminant function analysis revealed that mastoid process correctly classified the sex in 90 percent of the subjects and mastoid length was found to be the best determinant for sex. A discriminant function equation specific for the present study skeletal population has also been derived from the variables.

AC susceptibility apparatus for use with a closed-cycle helium refrigerator

A low cost mutual inductance bridge is constructed using only operational amplifiers. The bridge is suitable for measurement of AC magnetic susceptibility for a wide variety of magnetic materials. The measurement is done using a closed-cycle helium refrigerator from 16 to 300 K where the minimum detectable moment is 6*10-10 A m2 (6*10-7 EMU). This value could be reduced to 1*10-10 A m2 (1*10-7 EMU) if liquid helium is used as a coolant. The frequency response of this bridge is better than any other conventional one as no inductor is used in the electronic circuitry.

Electrical resistivity in polycrystalline La1.8Sr0.2CuO4 and YBa2Cu3O7−δ - temperature dependence and critical fluctuations

Abstract High resolution electrical resistivity data have been taken from 300 K down to zero-resistance temperatures in polycrystalline La 1.8 Sr 0.2 CuO 4 anf YBa 2 Cu 3 O 7−δ samples. Although there are abundant similar studies in YBaCuO, there is hardly any report in a relatively low T c system like LaSrCuO. The resistivity data of both systems fit better to the metallic formula than the Anderson-Zou (A-Z) relation. Using Aslamazov and Larkins theory of excess conductivity, we find strong evidence of three-dimensional critical fluctuations in both the systems. In the case of YBaCuO, it is possible to go beyond the mean-field region to the critical one through a crossover regime because of its higher T c . In log e -log e plots of excess conductivity vs reduced temperature, we observe continuous curvature for both systems. However, the local slopes found in different regimes are consistent with the theory of Lobb for 3D fluctuations. Such plots are shown to be rather sensitive to the choice of T c .

Effect of optimum thermal treatment on BiSrCaCu2Oy

BiSrCaCu2Oy compositions have been subjected to different atmosphere treatments and cooling schedules after initial calcination and firing in air. The large variation in properties has been explained on the basis of oxygen disorder effects and possible insertion of oxygen in different planes.

Superconducting glass ceramics in BiPbSrCaCuO system

Abstract Glass ceramic based superconductors in four different compositions in BiPbSrCaCuO system have been synthesised. The amorphous flakes were initially produced by crucibleless melting between twin rollers. The as prepared amorphous flakes were semiconductors. The different heat-treatment schedules were estimated from thermal analysis measurements. Characterisation of differently heated samples show that the growth of superconducting phase in the amorphous matrix is dependent upon the heat-treatment schedule. The results of X-ray diffraction data is consistent with the results of resistivity, AC susceptibility and optical microstructure.

QUALITY INDICATORS ARE EFFECTIVE TO MONITOR THE PERFORMANCE LEVEL OF PREANALYTICAL PHASE- A STUDY IN A CLINICAL LABORATORY OF EASTERN INDIA

1Assistant Professor, Department of Biochemistry, IQ City Medical College and Narayana Multispecialty Hospital. 2Assistant Professor, Department of Biochemistry, IQ City Medical College and Narayana Multispecialty Hospital. 3Associate Professor, Department of Biochemistry, IQ City Medical College and Narayana Multispecialty Hospital. 4Professor, Department of Anatomy, IQ City Medical College and Narayana Multispecialty Hospital.