Time filter

Source Type

Mhuskey T.,NIRT | Gour P.,NIIST
IEEE International Conference on Computer Communication and Control, IC4 2015 | Year: 2015

In this paper design and simulation of reconfigured microstrip patch antenna using metamaterial is proposed. A well known technique of effective substrate thickness is incorporated to improve the impedance bandwidth. The U shape modified ground plan with defective meander shape parasitic patch has been designed and the simulated results are presented. A much more improved bandwidth is obtained when patch is loaded with an open meander line shape. Permeability (μρ) and permittivity (£r) are reconfigured using the Nicolson-Ross-Weir (NRW) method. The simulation parameters satisfy required limits hence making the proposed antenna suitable for C-X Band applications. The antenna is simulated using IE3D software. The percentage impedance bandwidth obtained is 78.79%. © 2015 IEEE.

Raveendran A.E.,NIIST | Paul R.R.,NIIST | Suresh E.,Indian Central Salt and Marine Chemicals Research Institute | Nair V.,NIIST
Organic and Biomolecular Chemistry | Year: 2010

Nucleophilic heterocyclic carbenes (NHCs) have been used for the first time as catalysts in the cyclopropanation of ethyl cyanocinnamates with phenacyl bromide by Michael-initiated ring-closure (MIRC). © The Royal Society of Chemistry 2010.

Naik B.,Birla Institute of Technology and Science | Hazra S.,Birla Institute of Technology and Science | Muktesh P.,Birla Institute of Technology and Science | Prasad V.S.,NIIST | Ghosh N.N.,Birla Institute of Technology and Science
Science of Advanced Materials | Year: 2011

A simple chemical method has been reported for preparation of Ag nanoparticle (AgNP) loaded MCM-41 catalysts. This synthetic method involves in situ reduction of AgNO 3 by citrate ions within the porous structure of MCM-41. The synthesized materials were characterized by powder X-ray diffraction, high resolution transmission electron microscope and N 2 adsorption-desorption surface area and pore size analyzer. The synthesized catalysts possess high surface area with regular pore structure and spherical AgNP inside the pore channels of MCM-41. Synthesized AgNP incorporated MCM-41 materials showed the enhanced catalyst activity for the reduction of 4-nitrophenol to 4-aminophenol at room temperature. © 2011 American Scientific Publishers.

Naik B.,Birla Institute of Technology and Science | Hazra S.,Birla Institute of Technology and Science | Prasad V.S.,NIIST | Ghosh N.N.,Birla Institute of Technology and Science
Catalysis Communications | Year: 2011

Synthesis of uniform, spherical and rod shaped Ag nano particles within the uniform pore channels of mesoporous silica SBA-15 have been reported via a simple chemical method. High resolution transmission electron micrographs showed uniformly distributed spherical and rod shaped nano particles inside the pore channels of SBA-15. Synthesized Ag nano particle incorporated SBA-15 materials were acted as an efficient catalyst for the reduction of 4-nitrophenol to 4-aminophenol. © 2011 Elsevier B.V. All rights reserved.

Pandey S.,NIIST | Chauhan A.S.,NIIST
Smart Innovation, Systems and Technologies | Year: 2014

The communication in today's scenario is mostly rely on web, it will be increases day by day means the dependency of the users for communication is increases on web browsers. So thinking about security during data communication like text and image files will be legitimate. There are several research work are in progress in this direction. In this paper we present an efficient RC4 based secure content sniffing for web browsers which supporting textual files(word, pdf, text), web files(.jsp,.php.html) and image files also. In our proposed work we send the text data and image files by applying RC4 encryption algorithm. Data is then partition in several parts for reducing the file overhead and then the data will be sending with the extra bit of 0 and 1 for identifying the attack. Means our work will secure the encryption mechanism from the traditional file including wide variety of file formats. The effectiveness of our approach is shown by the results. © Springer International Publishing Switzerland 2014.

Gupta S.,NIIST | Kumar S.,NIIST
2014 International Conference on Communication and Network Technologies, ICCNT 2014 | Year: 2014

In this paper Design and Analysis of Compact and Broadband High Gain Micro strip Patch Antennas is presented using via hole technique for enhancement in bandwidth. This paper present optimization of inductance using Via hole technique, via hole technique used to reduced losses of ground plane and enhance surface current, the proposed antenna is validated in IE3D Simulator, from the simulation results we found this technique provided broad bandwidth. The proposed antenna used for C-Band application, Microstrip Patch Antenna (MPA) is generally used in modern communication devices and a large part of day-to-day communication is done through it. Study of literature of past few year shows that, the leading work on MPA is focused on designing compact sized broadband microstrip antenna. But inherently MPA have narrow bandwidth so to enhance bandwidth various techniques are engaged. © 2014 IEEE.

Gupta D.,NIIST | Chauhan A.S.,NIIST
Advances in Intelligent Systems and Computing | Year: 2014

Data Mining is the area of research by which we can find relevant patterns from the data set. It is used in several areas. In this paper we are focusing on finding relevant patterns from Positive and Negative Rules. For this we have applied Ant Colony Optimization (ACO) technique on the positive and negative rules. Our algorithm has achieved better global optimum value and chances of finding are improved. So the chances of Positive or relevant rules are more in comparison to the traditional technique. We are also applying the optimization to the negative rules so that there are equal chances for achieving the global optimum. But the negative rules are not qualifying the global optimum value and hence the relevant rules find by our algorithm are verified. © Springer International Publishing Switzerland 2015.

Naik B.,Birla Institute of Technology and Science | Prasad V.S.,NIIST | Ghosh N.N.,Birla Institute of Technology and Science
Powder Technology | Year: 2010

A simple chemical method has been developed for preparation of Ag nanoparticles dispersed on mesoporous silicate matrix, SBA-15. Ag nanoparticles were uniformly dispersed on SBA-15 matrix by using the reduction reaction of AgNO3 with trisodium citrate. The synthesized materials were characterized by using room temperature powder XRD analysis, N2 adsorption-desorption isotherm, high resolution TEM and SEM. It was observed that the synthesized SBA-15 and Ag-SBA-15 have a surface area of 778 and 151 m2/g respectively. The synthesized materials have long range ordering of pores with narrow pore size distribution centered at ∼ 7 nm. Pore structure of SBA-15 remains preserved even after deposition of Ag nanoparticle. This chemical route reported here offers a simple method for preparation of Ag-SBA-15, where unagglomerated Ag nanoparticles (∼ 20 nm) are uniformly dispersed on SBA-15. © 2010 Elsevier B.V. All rights reserved.

Naik B.,Birla Institute of Technology and Science | Prasad V.S.,NIIST | Ghosh N.N.,Birla Institute of Technology and Science
Powder Technology | Year: 2012

In this paper, we report a simple chemical reduction method for synthesis of spherical Ag nanoparticles (average size ~7nm) within mesoporous alumina matrix. Shape and size of the Ag nanoparticles and structure of the catalysts are investigated by using high resolution transmission electron microscopy, diffuse reflectance spectroscopy, N 2 adsorption-desorption analysis, XRD and particle size analysis. The synthesized catalysts possess BET surface area of 281.6m 2/g and average pore size 6.38nm. The synthesized Ag nanoparticle loaded mesoporous aluminas exhibit catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol. © 2012 Elsevier B.V.

Apte S.,DMIETR | Suhane P.,NIIST
International Conference on Electrical, Electronics, Signals, Communication and Optimization, EESCO 2015 | Year: 2015

Renewable energy is an energy it return naturally from the resources. In high-power applications, interleaved uncoupled boost converters has been proposed to increase the output power and to decreases the output ripple. The generally used renewable energy include fuel cells and photovoltaic cells. The IBC is discussed in this paper for renewable energy applications. The applications of interleaved boost converter(IBC) compared to the classical boost converter are lower input current ripple, high efficiency, low electromagnetic emission and improved reliability. In this paper we study uncoupled boost converter using different types of filter. By using this we observe which filter is more efficient on uncoupled inductor for renewable energy. The waveforms of output voltage and inductor current ripple are obtained by using Simulation in MATLAB. Using the results come from simulation result on MATLAB the best of the four filter on uncoupled boost converter is inferred. © 2015 IEEE.

Loading NIIST collaborators
Loading NIIST collaborators