A new clustering method using an augmentation to the self organizing maps

A technique is developed using Self Organizing Maps (SOM) to efficiently cluster the data and it is compared with existing clustering Techniques such as K-Means clustering, Hierarchical clustering and SOM Clustering. The proposed technique is used to cluster an Earthquake dataset and the performance is compared with the other existing clustering technique. The experimental results show that the proposed clustering method demonstrated better results as compared to other clustering methods

Effects of Isothermal and Adiabatic Thermal Loadings on Size and Strain Rate Dependence of Copper Nanowire

In the present paper, the size and strain rate effects on ultra-thin <100>/{100} Cu nanowires at an initial temperature of 10 K have been discussed. Extensive molecular dynamics (MD) simulations have been performed using Embedded atom method (EAM) to investigate the structural behaviours and properties under high strain rate. Velocity-Verlet algorithm has been used to solve the equation of motions. Two different thermal loading cases have been considered: (i) Isothermal loading, in which Nose-Hoover thermostat is used to maintain the constant system temperature, and (ii) Adiabatic loading, i.e., without any thermostat. Five different wire crosssections were considered ranging from 0.723 x 0.723 nm2 to 2.169 x 2.169 nm2. The strain rates used in the present study were 1 x 109 s-1, 1 x 108 s-1, and 1 x 107 s-1. The effect of strain rate on the mechanical properties of copper nanowires was analysed, which shows that elastic properties are independent of thermal loading for a given strain rate and cross-sectional dimension of nanowire. It showed a decreasing yield stress and yield strain with decreasing strain rate for a given cross-section. Also, a decreasing yield stress and increasing yield strain were observed for a given strain rate with increasing cross-sectional area. Elastic modulus was found to be ~ 100 GPa, which was independent of processing temperature, strain rate, and size for a given initial temperature. Reorientation of <100>/ {100} square cross-sectional copper nanowires into a series of stable ultra-thin pentagon copper nanobridge structures with dia of ~ 1 nm at 10 K was observed under high strain rate tensile loading. The effect of isothermal and adiabatic loading on the formation of such pentagonal nanobridge structure has been discussed.Defence Science Journal, 2009, 59(3), pp.252-259, DOI:http://dx.doi.org/10.14429/dsj.59.151

The Role of Silicon Content on Environmental Degradations of T91 Steels

T91 grade steels showed a gradual enhancement in tensile ductility at ambient temperature due to an increase in Si content from 0.5 to 2.0 weight percent (wt.%). However, the ultimate tensile strength was reduced only above 1.5 wt.% Si. The corrosion potential became more active in an acidic solution with increasing temperature. The cracking susceptibility in a similar environment under a slow-strain-rate (SSR) condition was enhanced at higher temperatures showing reduced ductility, time to failure, and true failure stress. Cathodic potentials applied to the test specimens in SSR testing caused an enhanced cracking tendency at 30 and 60°C, suggesting hydrogen embrittlement as a possible mechanism of failure. Cracking of precracked and wedge-loaded double-cantilever-beam specimens was enhanced at higher initial stress intensity factors. In general, steels with 2.0 wt.% Si showed inferior corrosion resistance. A combination of cleavage and intergranular brittle failure was seen in the tested specimens depending on the type of testing

Probing the CP-violating light neutral higgs in the charged higgs decay at the LHC

The CP-violating MSSM allows existence of a light neutral Higgs boson (MH150 GeV) in the CPX scenario in the low tan β (5)region, which could have escaped the LEP searches due to a strongly suppressed H1ZZ coupling. This parameter space corresponds to a relatively light H+ (MH+<Mt), which is predicted to decay dominantly into the WH1 channel. Thus one expects to see a striking tt- signal at the LHC, where one of the top quarks decays into the bbb-W channel, via t→bH±, H±→WH1 and H1→bb-. The characteristic correlation between the bb-,bb-W and bbb-W invariant mass peaks is expected to make this signal practically free of the SM background. Our parton level Monte Carlo simulation yields upto 5000 events, for L=30 fb-1, over the parameter space of interest, after taking into account the b-tagging efficiency for three or more b-tagged jets

Epoxy-glass Microballoon Syntactic Foams for Blast Mitigating Applications

Polymeric syntactic foams refer to a class of cellular material created using preformed hollow spheres bound together with a polymeric matrix. These cellular materials possess exceptional ability to respond against high impact dynamic loads. This paper is an attempt to fabricate polymeric syntactic foams of epoxy containing hollow glass microballoon at varying loading (40 % - 60 %) and explore their potential towards blast mitigation. The tensile, compressive and flexural strength were found to be inversely proportional to the microballoon loading in the quasi-static regime. The strain rate sensitivity of the foams was confirmed by performing high strain rate studies using split hopkinson pressure bar. The flow stress of these foams was found to increase with increasing strain rates. The syntactic foams were subjected to controlled transient blast loadings using a shock tube. The samples remained intact and no strain was observed on the strain gauge, even under a blast load of ~ 90 psi, which clearly highlight their potential as core materials for blast mitigating applications

'Cashew Apple' Juice Blend with Mango, Pineapple and Sapota for Improving Quality of RTS Beverages and Economic Feasibility Thereof

The present study on value-addition in cashew apple (Anacardium occidentale L.) juice by blending it with mango, pineapple and sapota juices for preparation of RTS beverage was conducted during the year 2012-2013 at Horticultural College and Research Institute, Dr. YSR Horticultural University, Andhra Pradesh, in Completely Randomized Design (CRD) with 3 replications and 10 treatments. In the present investigation, 'cashew apple' juice extracted from the fruit was blended with fruit juices of mango, pineapple and sapota in various proportions. RTS beverages prepared from different blends of cashew apple juice were evaluated for physico-chemical and organoleptic properties at 0, 30 and 60 days of storage, and significant differences were observed. RTS beverage prepared from a blend of 25% cashew apple juice + 75% mango juice (T3) recorded a gradual decrease in pH, titrable acidity and ascorbic acid content from 0 to 60 days after storage, whereas, density of the blended juice increased gradually at 0 to 30 days of storage; thereafter it decreased. Total soluble solids, reducing sugars and TSS/Acid ratio gradually increased from 0 to 60 days of storage, followed by 25% cashew apple juice + 75% pineapple juice (T6). Organoleptic score for RTS prepared from 25% cashew apple juice + 75% mango juice blend (T3), followed by 50% cashew apple juice + 50% mango juice blend (T2), 25% cashew apple juice + 75% pineapple juice blend (T6) and 50% cashew apple juice + 50% pineapple juice blend (T5), were found to be high on quality, viz., colour, taste and overall acceptability, up to 60 days of storage, and were economical for RTS preparation