Structural and Mechanical study of thermally annealed Tungsten Nitride thin films
Publication date: Available online 11 July 2016 Source:Perspectives in Science Author(s): P.L. Moharana, Sharmistha Anwar, Aminul Islam, Shahid Anwar Tungsten nitride films were deposited by RF reactive magnetron sputtering using Tungsten target. The films were subsequently annealed under high vacuum at different temperatures (700°C to 850°C) for 2hours each. The phase of the films were obtained using X-Ray diffraction. EDAX and Nano-indentation tests were carried out to obtain the elemental composition and hardness respectively. XRD results of the as prepared film show the formation of pure fcc W2N phase and...
Source: Perspectives in Science - July 14, 2016 Category: Science Source Type: research
Design of a Polynomial Ring based Symmetric Homomorphic Encryption Scheme
Publication date: Available online 12 July 2016 Source:Perspectives in Science Author(s): Smaranika Dasgupta, S.K. Pal Security of data, especially in clouds, has become immensely essential for present-day applications. Fully homomorphic encryption (FHE) is a great way to secure data which is used and manipulated by untrusted applications or systems. In this paper, we propose a symmetric FHE scheme based on polynomial over ring of integers. This scheme is somewhat homomorphic due to accumulation of noise after few operations, which is made fully homomorphic using a refresh procedure. After certain amount of homomor...
Source: Perspectives in Science - July 14, 2016 Category: Science Source Type: research
DIDATTICA DELLA CHIMICA E TRASPOSIZIONE DIDATTICA Parte seconda - Un’approccio didattico alla costruzione del concetto di trasformazione chimica
Publication date: Available online 7 June 2016 Source:Perspectives in Science Author(s): Elena Ghibaudi, Ezio Roletto, Alberto Regis Questa seconda parte illustra un esempio di trasposizione didattica realizzata in Italia, in classi della scuola secondaria di II grado. Oggetto della trasposizione sono i concetti di trasformazione chimica, di reazione chimica e di equazione di reazione; un risultato di questo percorso è l’introduzione della distinzione fra le nozioni di atomo e molecola da parte degli allievi stessi, come ipotesi necessaria per interpretare la fenomenologia osservata. L’approccio adottato in ...
Source: Perspectives in Science - June 7, 2016 Category: Science Source Type: research
Security Threats and Their Mitigation in Infrastructure as a Service
Publication date: Available online 5 June 2016 Source:Perspectives in Science Author(s): Bineet Kumar Joshi, Mohit Kumar Shrivastava, Bansidhar Joshi Cloud computing is a hot technology in the market. It permits user to use all IT resources as computing services on the basis of pay per use manner and access the applications remotely. Infrastructure as a Service (IaaS) is the basic requirement for all delivery models. Infrastructure as a service delivers all possible it resources (Network Components, Operating System, etc.) as a service to users. From both users and providers point of view: integrity, privacy and ...
Source: Perspectives in Science - June 5, 2016 Category: Science Source Type: research
Electromechanical modelling of tapered ionic polymer metal composites transducers
Publication date: Available online 29 April 2016 Source:Perspectives in Science Author(s): Rakesha Chandra Dash, Sujoy Mukherjee Ionic polymer metal composites (IPMCs) are relatively new smart materials that exhibit a bidirectional electromechanical coupling. IPMCs have large number of important engineering applications such as micro robotics, biomedical devices, biomimetic robotics etc. This paper presents a comparison between tapered and uniform cantilevered Nafion based IPMCs transducer. Electromechanical modelling is done for the tapered beam. Thickness can be varied according to the requirement of force and de...
Source: Perspectives in Science - June 2, 2016 Category: Science Source Type: research
Flow characteristics of air in square duct using delta wing vortex generators
Publication date: Available online 30 April 2016 Source:Perspectives in Science Author(s): Mahesh R. Ingalagi, Vadiraj V. Katti Performance improvement in terms of improving heat transfer coefficient and reducing pressure drop becomes essential in heat exchange applications and a large number of methods for reducing pressure drop exist in the literature and the present work is an investigation on use of delta wings as vortex generators for reducing pressure drop. Methodology includes air from a blower entering the test section through orificemeter and differential-micro manometer to measure the flow rate and pressu...
Source: Perspectives in Science - June 2, 2016 Category: Science Source Type: research
Wear characterization and modelling of Mn−steel liners used in rock crushers
Publication date: Available online 30 April 2016 Source:Perspectives in Science Author(s): Rahul Sinha, A.K. Mukhopadhyay There are several techniques such as surface profilometry, advanced technique of electron microscopy and optical methods which have been used by researchers to determine the measurement of wear and it is found useful to understand the surface geometry of the material. In mining industries, wear is acute in rock crusher. This work explores the characterization of wear observed on the surface of liner material of roll crusher crushing coal. Wear characterization like ploughing, scratching, cavitie...
Source: Perspectives in Science - June 2, 2016 Category: Science Source Type: research
Effectiveness of ANN for seismic behaviour prediction considering geometric configuration effect in concrete gravity dams
In this study, an Artificial Neural Networks (ANN) model is built and verified for quick estimation of the structural parameter obtained for a concrete gravity dam section due to seismic excitation. The database of numerous inputs and outputs obtained through Abaqus which are further converted into dimensionless forms in the statistical software (MATLAB) to build the ANN model. The developed model can be used for accurate estimation of this parameter. The results showed an excellent capability of the model to predict the outputs with high accuracy and reduced computational time. (Source: Perspectives in Science)
Source: Perspectives in Science - May 30, 2016 Category: Science Source Type: research
Inhibitory action of dextran on the corrosion of 6061Al–15%(v) SiC(P) composite in HCl medium
Publication date: Available online 29 April 2016 Source:Perspectives in Science Author(s): B.P. Charitha, Padmalatha Rao Dextran, a biopolymer was used as an eco-friendly inhibitor to control the corrosion of 6061Al–15%(v) SiC(P) composite in 0.25M HCl medium. The electrochemical studies like potentiodynamic polarization method, electrochemical impedance spectroscopy techniques were adopted. Evaluation of kinetic and thermodynamic parameters was done. Inhibitor adsorption on the surface of the composite was confirmed by surface morphology studies like SEM and EDX studies. Maximum inhibition efficiency of 80% was ...
Source: Perspectives in Science - May 30, 2016 Category: Science Source Type: research
New approximation algorithms for solving graph coloring problem – An experimental approach
Publication date: Available online 30 April 2016 Source:Perspectives in Science Author(s): Raja Marappan, Gopalakrishnan Sethumadhavan, R.K. Srihari Some of the real world applications require the solution to graph coloring problem, an NP-hard combinatorial optimization problem. χ(G), the chromatic number of a graph G, the minimum number of colors required to color the vertex set V(G) with adjacent vertices assigned with different color can also be obtained using evolutionary methods. This paper exhibits two new approximation methods of solving graph coloring based on μ ½(G), the median of the degrees V(G). In...
Source: Perspectives in Science - May 30, 2016 Category: Science Source Type: research
An improved method to estimate the fractal dimension of colour images
In this study, the improved differential box counting method is applied to the 24 bit representation of RGB color images to extract the roughness of color images. The validation of the proposal is performed by generating twelve different synthesized color images in terms of small variation of intensity value in RGB space and compared with previously three well defined existing methods that are weighted sum, average and desaturation method. The results showed that our proposed method is able to capture the accurate sharp variation of roughness as compared to the existing methods. (Source: Perspectives in Science)
Source: Perspectives in Science - May 30, 2016 Category: Science Source Type: research
Solving channel allocation problem using new genetic operators – An experimental approach
Publication date: Available online 2 May 2016 Source:Perspectives in Science Author(s): Raja Marappan, Gopalakrishnan Sethumadhavan, U. Harimoorthy Channel allocation schemes are required in mobile networks to allocate bandwidth and channels to mobile stations. The main objective of channel allocation is to achieve maximum efficiency by means of channel reuse by avoiding adjacent and co-channel interferences among nearby cells or networks that share the bandwidth. Channel allocation problem, an NP-hard problem, which means an exact solution cannot be found in polynomial time. Evolutionary and heuristic algorithms...
Source: Perspectives in Science - May 24, 2016 Category: Science Source Type: research
Design and development of semantic web-based system for computer science domain-specific information retrieval
Publication date: Available online 27 April 2016 Source:Perspectives in Science Author(s): Ritika Bansal, Sonal Chawla In semantic web-based system, the concept of ontology is used to search results by contextual meaning of input query instead of keyword matching. From the research literature, there seems to be a need for a tool which can provide an easy interface for complex queries in natural language that can retrieve the domain-specific information from the ontology. This research paper proposes an IRSCSD system (Information retrieval system for computer science domain) as a solution. This system offers advance...
Source: Perspectives in Science - May 23, 2016 Category: Science Source Type: research
Computational simulation of multi-strut central lobed injection of hydrogen in a scramjet combustor
Publication date: Available online 21 May 2016 Source:Perspectives in Science Author(s): Gautam Choubey, K.M. Pandey, Deepak Sharma, Ajoy Debbarma Multi-strut injection is an approach to increase the overall performance of Scramjet while reducing the risk of thermal choking in a supersonic combustor. Hence computational simulation of Scramjet combustor at Mach 2.5 through multiple central lobed struts (three struts) have been presented and discussed in the present research article. The geometry and model used here is slight modification of the DLR (German Aerospace Center) scramjet model. Present results show t...
Source: Perspectives in Science - May 21, 2016 Category: Science Source Type: research
Assessment of Thermal energy by Varying Process parameters of Dyeing process in Textile Industries
This study relates with the assessment of dyeing processes for textile materials using actual operational data. The objective of the current work is to tackle the effects of the process parameters on energy utilization rates. The water inlet temperature, process temperature, process time and liquor ratio were the key parameters that affect energy consumption rates. A detailed study was conducted for small the scale textile industry in depth for the different processes involved, operating parameters (mass to liquor ratio (MLR), Process Temperature and Process Time) and to study effects of Process Temperature, Process Time a...
Source: Perspectives in Science - May 18, 2016 Category: Science Source Type: research
