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RISS 인기검색어
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- 저자 : Rahul Singhal (검색결과 3 건)
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Rahul Dev Mishra,Pramod Kumar Singhal 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.5
Microstrip patch antenna is a low profile antenna which has low gain and narrow bandwidth. In this paper a RMPA at 2.4835 GHz is designed for mounting antenna in exposure system. Exposure system is a chamber made up of wood in which two antennas of same frequency mounted. One antenna is used for radiation while other one for reception. The RMPA designed using CST software with gain of 2.8647 dB. In exposure system animals like rats can be placed for observing effects from Wi-Fi systems. These effects are applicable to humans also. For observing effects gain is not sufficient so there is need of gain enhancement. There are numerous techniques of gain enhancement but I proposed antenna array technique. Antenna array which is a collection of radiating elements are very versatile and synthesize a required pattern that can not be achieved using single element. So here two rectangular patches of same size and frequency connected as an array. The gain of array system is 5.6692 dB. Hence there is 97.89% increase in the gain of RMPA.
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말호트라,Rahul Singhal,Asha Chaubey,Sandeep K. Sharma,Ashok Kumar 한국물리학회 2005 Current Applied Physics Vol.5 No.2
Rapid advances in biosensors have recently been reported. This has been possible due to rapid growth in the development of newbiomaterials such as conducting polymers, copolymers and sol gels etc and the reported improvements in sensing techniques. Bio-sensors are miniaturized devices employing biochemical molecular recognition as the basis for a selective analysis. The response gen-erated as a result of biochemical reaction is detected by a transducer to give a signal (optical/electrical/thermal) that can be used withor without amplication for the estimation of the concentration of an analyte in a given test sample. Among the various biosensors,electrochemical sensors, especially amperometric biosensors presently hold a leading position.Due to specicity, portability, simplicity, high sensitivity, potential ability for real-time and on-site analysis coupled with thespeed and low cost, biosensors have been projected to have applications in food analysis, environment control, clinical detection,drug and agriculture industries etc. Besides this, biosensors oer exciting opportunities for numerous decentralized clinical applica-tions, ranging from emergency room screening, home self testing and alternative site testing, continuous and real-time in vivo mon-itoring. New generation of biosensors combining new bioreceptors with the ever-growing number of transducers is emerging. Thepresent paper highlights some of the recent advances in the area of biosensors contributed by our laboratory..
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Large tuning of Surface Plasmon Resonance of Au-fullerene nanocomposite
Ritu Vishnoi,Satakshi Gupta,Ganesh D. Sharma,Rahul Singhal 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.1
Gold–fullerene C 60 nanocomposite thin fi lms prepared by thermal co-deposition were irradiated by a high energy beam of120 MeV Ag ions using Pelletron accelerator. Absorption spectra revealed a large and progressive tuning of surface plasmonresonance wavelength when the fi lms were irradiated at higher fl uences. This blue shift (~ 119 nm) can be ascribed to theevolution of fullerene into amorphous carbon upon bombardment of high energy ions at higher fl uences and causes a shiftin refractive index of the matrix. Raman spectra ascertained this transformation with the presence of two bands: D and Gband. Ion irradiation also leads to the formation of bigger size Au nanoparticles with well defi ned spherical shape at higherfl uences as confi rmed by TEM. XRD results demonstrated decrease in FWHM of diff raction peaks indicating the increasein particle size which is in agreement with the result obtained from TEM analysis.
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