Gaussian smoothed SAR image spectra have been evaluated from 512 x 512 pixel subscenes of image mode ERS-1 SAR scenes off Goa, Visakhapatnam, Paradeep and Portugal. The two recently acquired scenes off Portugal showed the signature of swell of wavelength 200m and internal waves of wavelength > 400m. Only internal waves of wavelength > 400m were seen in the scene off Goa observed on 11 March 199...

The effects of the pumping wavelength and their power on the gain flattening of a fiber Raman amplifier (FRA) are investigated. The multi-wavelength pumping scheme is utilized to achieve gain flatness in FRA. It is proposed that gain flatness becomes better with increase in number of pumping wavelengths applied. We have achieved flat gain with 0.27 dB fluctuation in a spectral range of 1475-160...

Certain approximations commonly used in the absolute calibration of a scanning monochromator are examined in terms of the response of the instrument to a monochromatic input. The absolute irradiance due to any spectral feature in the neighborhood of lambda(0) is commonly computed from the expression W = AB(lambda(0))/H(lambda(0)) where A is the area of the spectral feature as recorded by the mo...

This paper describes the feature stabilities for four basic image transformations, while examining an image feature extraction method using 2D Gabor filters, as an exmple. The basic transformations are intensity change, scaling, translation, and rotation. Based on the consideration about intensity change and scaling, feature normalization methods were proposed. Moreover, optimal sampling resolu...

The performance of different chemometric approaches was evaluated in the spectrophotometric determination of pharmaceutical mixtures characterized by having the amount of components with a very high ratio. Principal component regression (PCR), partial least squares with one dependent variable (PLS1) or multi-dependent variables (PLS2), and multivariate curve resolution (MCR) were applied to the...

Dispersible microscale mirror particles were synthesized by linkage of citrate-coated gold nanoparticles and 3-aminopropylsilyl-modified Ca2Nb3O10 perovskite nanoplates. The mirror particles reflect 14-19% of light in the 500-800 nm wavelength interval with retention of polarization. Due to their directional reflection properties, laser-irradiated micromirror dispersions in solvents exhibit Bro...

- The increasing demand for high-quality coffee has led to making various tests guarantee the quality of be accepted in market. This study aimed know caffeine content Robusta Luwak roasted at different temperatures. used this is pure and mixed with rice. was conducted using roasting temperatures, namely 190⁰C 240⁰C. additional material combined rice mass fractions 10%, 20%, 30%, 40%, 50%. absor...

We present narrow band images of the gravitational lens system Q 2237+0305 made with the Nordic Optical Telescope in eight different filters covering the wavelength interval 3510-8130 Å. Using PSF photometry fitting we have derived the difference in magnitude vs. wavelength between the 4 images of Q 2237+0305. At λ = 4110 Å, the wavelength range covered by the Strömgren-v filter coincides with ...

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