Informatics Publishing Limited

Shilpa Jindal ¹, N. Gupta ¹

Affiliations
1 Department of Electronics Electrical and Communication Engineering, PEC University of Technology, Sector 12, Chandigarh, IN

Abstract

The wide-ranging services of the Internet have caused the rapid increase of bandwidth requirements on the access networ that can be achieved by relying on fiber optics for future networks. OCDMA is a technology to realize multiplexing transmission and multiple access by coding in the optical domain, supporting multiple simultaneous transmissions in the same timeslot, space and frequency. It is another technology of multiplexing and multiple access. Performance of OCDMA is based on coding techniques. Through this communication various codes for these networks proposed by researchers are discussed like zero cross correlation codes, Perfect Difference Code Set based , optical orthogonal codes, Quasi optical orthogonal codes ,Constant Weight Symmetric OOC, Constant Weight Asymmetric OOC, Variable Weight OOC, Prime Codes, Modified Prime Codes, Time Spreading codes , Frequency Hopping Codes, Linear Congruence codes, Quadratic Congruence codes, Extended Quadratic Congruence codes, Bipolar Codes , Costas Arrays e.t.c and the codes proposed by authors based on two models A and B .Based on their methodology comparison thereof is drawn that the codes given by researchers are easy to construct and have good properties.

Keywords

Optical Code Division Multiple Access, Optical Orthogonal Codes, Prime Sequences, 1d, 2d, 3d, Algebraic Congruent Operator, Linear Congruent Operator, Quadratic Congruent Operator, Hyperbolic Congruent Operator, Cubic Congruent Operator, Galois Field, Golomb.

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N. Gupta ¹

Affiliations
1 Department of Computer Science and Engineering, Govt. Engineering College, Bikaner, Rajasthan, IN

Abstract

Elliptic Curve Cryptography or Cryptosystem (ECC) is one of the public-key cryptosystem. The main advantage and benefit of ECC instead of RSA is that it gives equivalent security by using smaller key then in RSA; thereby it consumes less number of resource and also less amount of memory. There are various advantages of ECC over RSA such as low bandwidth usage, low computational time and small key size; it can also be used for image encryption. Through this paper image encryption with using ECC is presented. It discusses the encryption, compression and decryption of image using ECC on matlab as platform.

Keywords

Cryptography, Decryption, Elliptic Curve, Encryption.

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N. Gupta ¹, J. Sabat ¹

Affiliations
1 Regional Plant Resource Centre, Bhubaneswar (Orissa), IN

Abstract

An attempt Was made to evaluate the salt tolerance behaviour of Aspergillus sp. and Bacillus sp. isolated on Brain heart infusion agar from muddy water of Bhitarkanika mangrove ecosystem by growing them under different salt concentration in broth medium . It was observed that fungus could tolerate salt stress upto 16% where as bacteria could be able to grow upto 11 %. The Aspergillus sp. showed increase in growth with the increasing concentration of NaCl where as bacteria declined its growth in this condition. It was observed that acidic metabolites was produced by fungus, therefore, its pH was decreased with the increasing level of NaCl . Simultaneously, bacteria did not show any significant changes in pH of filtrate of different saline treated cultures. The protein content in the culture filtrate of fungus increased in higher concentration of salt . However, bacteria did not behave in the same manner rather showed negative effect of salinity on growth. The present attempt made to analyze the salt stress in fungus and bacteria was of primary nature that provided us various clues to work further.

Keywords

Mangrove, Saline, Fungi, Bacteria, Salt Tolerant, NaCl, Halotolerant.

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J. Sabat ¹, N. Gupta ¹

Affiliations
1 Microbilogy laboratory, Division of Biotechnology, Regional Plant Resource Centre, Bhubaneswar (Orissa), IN

Abstract

Sixty isolates of Streptomyces were isolated from heavy metal contaminated soils of different mines of Orissa.. These isolates were studied for their gram staining properties, extra cellular and fermentative activity. All cultures were branching and rods, gram positive. They showed varied performance during the biochemical and enzymatic tests and analysis. The importance of these isolates is discussed with respect to their distribution in such a extreme habitat of heavy metal contaminated soils of mines of Orissa.

Keywords

Streptomyces, Mines, Matal Contaminated Soil.

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J. Sabat ¹, N. Gupta ¹

Affiliations
1 Microbiology Laboratory, Division of biotechnology Regional Plant Resource Centre, Bhubaneswar 751 015 (Orissa), IN

Abstract

Seven fungi were isolated from heavy metal mine soils of Joda (Orissa) , India. These fungi exhibited tolerance to manganese salt in broth culture under laboratory conditions. The growth of Aspergillus sp. 3 and Cunnighamella sp. was found to be more in 0.2% concentration of manganese.

Keywords

Manganese, Metal Tolerance, Fungi, Bacteria , Growth.

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K. K. Yadav ¹, N. Chouhan ², R. Thubstan ², S. Norlha ², J. Hariharan ², C. Borwankar ², P. Chandra ², V. K. Dhar ¹, N. Mankuzhyil ², S. Godambe ², M. Sharma ², K. Venugopal ², K. K. Singh ¹, N. Bhatt ², S. Bhattacharyya ¹, K. Chanchalani ², M. P. Das ², B. Ghosal ², S. Godiyal ², M. Khurana ², S. V. Kotwal ², M. K. Koul ², N. Kumar ², C. P. Kushwaha ², K. Nand ², A. Pathania ², S. Sahayanathan ¹, D. Sarkar ², A. Tolamati ², R. Koul ³, R. C. Rannot ⁴, A. K. Tickoo ⁵, V. R. Chitnis ⁶, A. Behere ⁷, S. Padmini ⁷, A. Manna ⁷, S. Joy ⁷, P. M. Nair ⁷, K. P. Jha ⁷, S. Moitra ⁷, S. Neema ⁷, S. Srivastava ⁷, M. Punna ⁷, S. Mohanan ⁷, S. S. Sikder ⁷, A. Jain ⁷, S. Banerjee ⁷, Krati ⁷, J. Deshpande ⁷, V. Sanadhya ⁸, G. Andrew ⁸, M. B. Patil ⁸, V. K. Goyal ⁸, N. Gupta ⁸, H. Balakrishna ⁸, A. Agrawal ⁸, S. P. Srivastava ⁹, K. N. Karn ⁹, P. I. Hadgali ⁹, S. Bhatt ⁹, V. K. Mishra ⁹, P. K. Biswas ⁹, R. K Gupta ⁹, A. Kumar ⁹, S. G. Thul ⁹, R. Kalmady ¹⁰, D. D. Sonvane ¹⁰, V. Kumar ¹⁰, U. K. Gaur ¹⁰, J. Chattopadhyay ¹¹, S. K. Gupta ¹¹, A. R. Kiran ¹¹, Y. Parulekar ¹¹, M. K. Agrawal ¹¹, R. M. Parmar ¹¹, G. R. Reddy ¹², Y. S. Mayya ¹³, C. K. Pithawa ¹⁴

Affiliations
1 Astrophysical Sciences Division, Bhabha Atomic Research Centre, Mumbai 400 085, India; Homi Bhabha National Institute, Mumbai 400 085, India, IN
2 Astrophysical Sciences Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
3 Formerly at Astrophysical Sciences Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
4 Raja Ramanna Fellow at Astrophysical Sciences Division, Mumbai 400 085, India, IN
5 Deceased, IN
6 Department of High Energy Physics, Tata Institute of Fundamental Research, Mumbai 400 005, India, IN
7 Electronics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
8 Control and Instrumentation Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
9 Center for Design and Manufacture, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
10 Computer Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
11 Reactor Safety Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
12 Formerly at Reactor Safety Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
13 Formerly at Reactor Control Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
14 Formerly at Electronics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN

Abstract

The MACE telescope has recently been commissioned at Hanle, Ladakh, India. It had its first light in April 2021 with a successful detection of very high energy gamma-ray photons from the standard candle Crab Nebula. Equipped with a large light collector of 21 m diameter and situated at an altitude of ~4.3 km amsl, the MACE telescope is expected to explore the mysteries of the non-thermal Universe in the energy range above 20 GeV with very high sensitivity. It can also play an important role in carrying out multi-messenger astronomy in India.

Keywords

Gamma-ray astronomy, high energy radiative processes, non-thermal Universe, telescope.

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