Wyniki wyszukiwania - Biblioteka Nauki

1

A least area approach of Hough Transform for pattern recognition in seismic reflection

100%

Nath S. , Behura J.

Acta Geophysica Polonica

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2003

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tom Vol. 51, nr 2

155-164

EN

The intensive computational complexity, storage requirement, recognition of envelopes with parametric equations have rendered the standard Hough Transform interior to the intellectual mechanism of human's visual recognition. In this paper, a Modified Generalized Hough Transform is proposed which implements parametric equation of a straight line to establish relationship among various samples lying on a seismic reflector. It performs thresholding demarcation of interfaces in each window, establishment of continuity of interfaces from one window to another and mid-point smoothing. Based on its application on a zero-offset synthetic seismogram and a migrated CDP section presented here, the algorithm is found to be sensitive to the choice of window length. A time window of six samples or less with an equal degree of scrolling seems to the best suited for pattern recognition using this technique. However, a trade-off is necessary between the window length and the amount of overlap to obtain better reflection continuity.

2

Best approximation in quotient probabilistic normed space

80%

Sen M. , Nath S. , Tripathy B. C.

Journal of Applied Analysis

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2017

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tom Vol. 23, nr 1

53--57

EN

In this article, we study the best approximation in quotient probabilistic normed space. We define the notion of quotient space of a probabilistic normed space, then prove some theorems of approximation in quotient space are extended to quotient probabilistic normed space.

3

Estimation of model parameters from one-dimensional vertical electrical sounding data using evolutionary programming technique

80%

Shahid S. , Nath S. , Sircar A. , Patra H.

Acta Geophysica Polonica

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1999

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tom Vol. 47, nr 3

335-348

EN

Calculus based algebraic algorithms like Singular Value Decomposition, Ridge Regression, Weighted Ridge Regression, etc. were used in the inversion of resistivity data till late 80's. With the advent of high speed computers having higher disk space and parallel processing environment, several global optimization techniques (simulated evolution, simulated annealing, very fast simulated annealing, etc.) are adapted to solve various inherent problems in the inversion of geophysical data. In the present paper an attempt is made to use Evolutionary Programming (EP) technique for the estimation of layer parameters from one-dimensional Vertical Electrical Sounding (VES) data. The algorithm is coded in FORTRAN 77 and tested on both synthetic and actual field data. The results, compared with those obtained by Singular Value Decomposition and borehole lithology, prove the efficiency and robustness of the EP approach.

4

Splat formation and degradation of hydroxyapatite during plasma spraying process

80%

Mittal M. , Nath S. , Prakash S.

Advances in Materials Science

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2011

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tom Vol. 11, nr 2(28)

26-36

EN

Plasma spraying is most used thermal spray process for coating of bioceramic and bioinert materials. It is line of sight technique, easy to use and inexpensive as compared to other processes used for coatings. The main disadvantage of this technique for coating hydroxyapatite (HA) is that due to high temperature of plasma (of the order of 16000°C) HA tends to degrade into amorphous calcium phosphates. These amorphous phases are not desirable and have a tendency to dissolve in body environment. In this article an attempt has been made to understand the plasma spraying process for coating of hydroxyapatite.

5

Cadmium stress-induced oxidative stress and role of nitric oxide in rice (Oryza sativa L.)

70%

Panda P. , Nath S. , Chanu T. T. , Sharma G. D. , Panda S. K.

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nr 5

EN

Cadmium (Cd) is a potential environmental phytotoxicant. The generation of reactive oxygen species (ROS) due to Cd stress is responsible for the induction of oxidative stress in plants. On the other hand, SNP, a NO donor is known to have effect on Cd-induced oxidative stress in plants. We evaluated the effect of NO on the regulation of Cd stress in the rice (Oryza sativa L.) variety MSE-9. Cd treatment was given in the form of 50, 100 and 200 µM, whereas for interaction study, 100 µM of Cd and 100 µM of SNP were used. The result showed that Cd-induced oxidative stress in MSE-9 by generating ROS. However, when SNP was given with Cd stress, it was seen that SNP treatment regulated the stress metabolism in rice seedlings under Cd toxicity by generating NO. It can be said that the SNP in combination with Cd treatment might possess the way to protect rice seedlings under Cd stress.

6

Green tea extract affects porcine ovarian cell apoptosis

61%

Roychoudhry S. , Halenar M. , Michalcova K. , Nath S. , Kacaniova N. , Kolesarova A.

Reproductive Biology

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2018

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tom 18

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nr 1