Preparation of CaO-SiO2-P2O5 glass by Sol-gel route

Typical CaO-SiO2-P2O5 glass has been synthesized though sol-gel technique. Thermal analysis was carried out to evaluate the transformation temperature of glass. XRD analysis indicates the presence of several impurities along with amorphous phase

Do All BPS Black Hole Microstates Carry Zero Angular Momentum?

From the analysis of the near horizon geometry and supersymmetry algebra it has been argued that all the microstates of single centered BPS black holes with four unbroken supersymmetries carry zero angular momentum in the region of the moduli space where the black hole description is valid. A stronger form of the conjecture would be that the result holds for any sufficiently generic point in the moduli space. In this paper we set out to test this conjecture for a class of black hole microstates in type II string theory on $T^6$, represented by four stacks of D-branes wrapped on various cycles of $T^6$. For this system the above conjecture translates to the statement that the moduli space of classical vacua must be a collection of points. Explicit analysis of systems carrying a low number of D-branes supports this conjecture.Comment: LaTeX, 42 pages; v2: minor corrections, some new results adde

BPS State Counting in N=8 Supersymmetric String Theory for Pure D-brane Configurations

Exact results for the BPS index are known for a class of BPS dyons in type II string theory compactified on a six dimensional torus. In this paper we set up the problem of counting the same BPS states in a duality frame in which the states carry only Ramond-Ramond charges. We explicitly count the number of states carrying the lowest possible charges and find agreement with the result obtained in other duality frames. Furthermore, we find that after factoring out the supermultiplet structure, each of these states carry zero angular momentum. This is in agreement with the prediction obtained from a representation of these states as supersymmetric black holes.Comment: 26 pages; v2: minor corrections in section 5; v3: typos correcte

Sonomammographic and sonoelastographic evaluation of benign and malignant breast lesions and its correlation with fine needle aspiration cytology

Background: Breast cancer affects 25.8% of women worldwide. Mammography and ultrasound have sensitivity, but invasive breast biopsies and aggressive biopsies are essential. Sonoelastography is a non-invasive imaging method that can measure tissue stiffness related to different pathologic conditions, such as cancer. Objective is to assess the diagnostic accuracy of sonomammography and sonoelastography in diagnosing breast lesions as benign or malignant in correlation with fine needle aspiration cytology (FNAC) as gold standard. Methods: This study was conducted on 52 female patients with breast mass and sensitivity, specificity, negative predictive value (NPV), positive predictive value (PPV), kappa and p value of conventional gray scale ultrasound and ultrasonography (USG) elastography were calculated and compared with that of FNAC. Ultrasound was performed using grayscale and elastography mode on GE LOGIQ P9 ultrasound equipment with a 7-12 MHz linear-array transducer. All cases with breast lesions identified on ultrasound elastography underwent FNAC. Results: The sensitivity, specificity, PPV, NPV of sonoelastography were 78.5, 94.7, 84.6, 92.3 with kappa 0.75 and p value <0.0001. Similarly, sensitivity and specificity for strain ratio were 85.7 and 97.4, and that for size ratio were 85.7 and 100 respectively. These results are comparable to or better than results for conventional ultrasound. Conclusions: Breast elastography makes it easier to classify BIRADS 3 category lesions which are benign but still confused as malignant on conventional USG. BIRADS category 3 and 4 lesions with benign findings on sonoelastography can be downgraded to category 2 and 3 respectively thus reducing the number of false positive malignancy cases and biopsy

Quark mass, scale and volume dependence of topological charge density correlator in Lattice QCD

We study the two-point Topological Charge Density Correlator (TCDC) in lattice QCD with two degenerate flavours of naive Wilson fermions and unimproved Wilson gauge action at two values of lattice spacings and different volumes, for a range of quark masses. Configurations are generated with DDHMC algorithm and smoothed with HYP smearing. In order to shed light on the mechanisms leading to the observed suppression of topological susceptibility with respect to the decreasing quark mass and decreasing volume, in this work, we carry out a detailed study of the two-point TCDC. We have shown that, (1) the TCDC is negative beyond a positive core and radius of the core shrinks as lattice spacing decreases, (2) as the volume decreases, the magnitude of the contact term and the radius of the positive core decrease and the magnitude of the negative peak increases resulting in the suppression of the topological susceptibility as the volume decreases, (3) the contact term and radius of the positive core decrease with decreasing quark mass at a given lattice spacing and the negative peak increases with decreasing quark mass resulting in the suppression of the topological susceptibility with decreasing quark mass, (4) increasing levels of smearing suppresses the contact term and the negative peak keeping the susceptibility intact and (5) both the contact term and the negative peak diverge in nonintegrable fashion as lattice spacing decreases.Comment: 7 pages, 5 figures, talk presented at-The 30th International Symposium on Lattice Field Theory-Lattice 2012, June 24-29, 2012 Cairns, Australi

Response of Children with Down Syndrome To Physical Activity Programme On Motor Proficiency And Functional Abilities

Down syndrome occurs because of an abnormality characterized by an extra copy of genetic material on all or part of the 21st chromosome. The study was done with a purpose know the response of children with Down syndrome to physical activity programme on motor proficiency and functional abilities. 30 children (15 each in experimental and control group) having Down syndrome between the age group of 10-18 years were selected. Training programme of 55 minutes only to the experimental group was given, thrice a week for a period of 12 weeks. Bruininks Oseretsky test for motor proficiency (BOTMP), which provides an overall view of a child’s motor development, was administered. For assessing functional ability Fr. Thomas Felix’s Functional ability questionnaire (Felix, 1994) was used. Descriptive Statistics and Analysis of covariance (ANCOVA) were employed as statistical tool. The analysis of data revealed that the experimental group improved significantly in six of the motor proficiency skills and in all three functional ability variables by following 12 weeks of the physical activity programme. However, in rest eight motor proficiency skills, positive improvement was present; but it was not enough for statistical significance