Microwaves are non-ionizing electromagnetic radiation. With the growth of technology and increase in demand of cellular services day by day; the presence of microwaves in environment is also increasing. Mostly these services are operated at 945 MHz. The wavelength of microwaves spans from one meter to one millimeter, covering the spectrum from 300 MHz to 300 GHz. These frequencies may affect th...

A semi-empirical model of the infrared (IR) spectrum of the C60 molecule is proposed. The weak IR-active modes seen experimentally in a C60 crystalline sample are argued to be combination modes caused by anharmonicity. The origin of these 2-mode excitations can be either mechanical (anharmonic interatomic forces) or electrical (nonlinear dipole-moment expansion in normal modes coordinates). It ...

The infrared (IR) and Raman spectra of triphenylene with intensities were calculated using both density functional theory (DFT, B3LYP method) and Moller-Plesset perturbation method of second order (MP2) with ccpVDZ basis set. Spectra were compared with experimentally measured; the agreement between the observed and calculated spectra is good in case of IR spectroscopy, MP2 simulated spectra wer...

In the present study, an attempt has been made to prepare an extract by the methanol from Toddalia asiatica leaf and it contains alkaloids. The molecular structure, functional groups, chemical bonds, etc has been analyzed with the help of IR, UV and MS spectrum. The Gaussian software has been used to estimate the theoretical values of vibrational frequencies of IR spectrum and for obtaining pos...

High resolution spectra of Comet 8P/Tuttle were obtained in the frequency range 3440.6–3462.6 cm on 3 January 2008 UT using CGS4 with echelle grating on UKIRT. In addition to recording strong solar pumped fluorescent (SPF) lines of H2O, the long integration time (152 minutes on target) enabled a number of weaker H2O features to be assigned, most of which had not previously identified in cometar...

Multipath dispersion and fluorescent light interference are two major problems in indoor wireless infrared communications systems. Multipath dispersion introduces intersymhol interference at data r a t e s above 10 Mhis, while fluorescent light induces severe narrowband interference to baseband modulation schemes commonly used such as OOK and PPM. This article reviews the research into the appl...

Drastic changes can take place in the structure, dynamics, and thermodynamics of a fluid when it is confined to spaces of molecular dimensions, as compared to its bulk counterpart. Water confinement in the nanometer-scale channels and pores of inorganic open framework materials, such as zeolites, are of great scientific interest. Zeolites are crystalline aluminosilicates, with various controlle...

We conducted a multi-wavelength campaign in September-October, 2002, to observe SS 433. We used 45 meter sized 30 dishes of Giant Meter Radio Telescope (GMRT) for radio observation, 1.2 meter Physical Research Laboratory Infra-red telescope at Mt Abu for IR, 1 meter Telescope at the State Observatory, Nainital for Optical photometry, 2.3 meter optical telescope at the Vainu Bappu observatory fo...

Night vision and related thermal imaging systems play a critical role in the protection of our nation's security. These systems record images using video cameras designed for operation in the infrared (IR) region of the light spectrum. As with any imaging system, increased functionality and new information is gained when discrete portions of the observed light spectrum are analyzed separately u...

We compute joint AM-FM models that characterize infrared targets and backgrounds in the modulation domain. We consider spatially localized structures within an IR image as sums of nonstationary, quasi-sinusoidal functions admitting locally narrowband amplitude and frequency modulations. By quantitatively estimating the modulations that dominate the signal spectrum on a spatially local basis, we...