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A New sine-Ikeda Modulated Chaotic Key for Cybersecurity

Intelligent Automation & soft Computing 2023年第4期36卷 865-878页

作者： s.hanis Department of Electronics and Communication Engineering Sri Sivasubramania Nadar College of EngineeringChennai603110India

In the recent past,the storage of images and data in the cloud has shown rapid growth due to the tremendous usage of multimedia *** this paper,a modulated version of the Ikeda map and key generation algorithm are proposed,which can be used as a chaotic key for securely storing images in the *** distinctive feature of the proposed map is that it is hyperchaotic,highly sensitive to initial conditions,and depicts chaos over a wide range of con-trol parameter *** properties prevent the attacker from detecting and extracting the keys *** key generation algorithm generates a set of sequences using a designed chaos map and uses the harmonic mean of the gen-erated sequences as the seed ***,the control parameters are modi-ﬁed after each *** change in the control parameters after each iteration makes it difﬁcult for an attacker to predict the *** designed map was tested mathematically and through *** performance evaluation of the map shows that it outperforms other chaotic maps in terms of its parameter space,Lya-punov exponent,bifurcation *** the designed chaotic map with existing chaotic maps in terms of average cycle length,maximum Lyapunov exponent,approximate entropy,and a number of iterations,it is found to be very *** existence of chaos is also proved mathematically using schwartz’s derivative *** proposed key generation algorithm was tested using the National Institute of standards and Technology(NIsT)randomness test with excellent results.

关键词： Bifurcation chaos entropy keyspace cybersecurity key generation

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Carbon Dioxide Fixation Method for Electrosynthesis of Benzoic Acid from Chlorobenzene

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Journal of Natural Gas Chemistry 2007年第3期16卷 273-277页

作者： A.J.Aishah M.A.Hartini s.Normala A.M.Norhuda H.H.N hanis H.M.Razif T.sugeng Faculty of Chemical and Natural Resowrces Engineering Ibnu sina Institute for Fundamental science studies Universiti Teknologi Malaysia81310 UTM SkudaiJohorMalaysia.

Carbon dioxide fixation technique was developed as an alternative dechlorination method of chlorobenzenes. Electrolysis of chlorobenzene was carried out in a one-compartment cell fitted with an aluminium anode and a platinum cathode. Electrolysis in N, N-dimethylformamide （DMF） solution containing 0.1 M of tetrapropylammonium bromide （TPAB） at 0 ℃, 100 ml/min of CO2 flow rate and 120 mA/cm^2 of current density was found to be the optimum conditions of this electrocarboxylation, which gave 72% yield of benzoic acid from chlorobenzene. These conditions were then applied to 1,2-dichlorobenzene and 1,3-dichlorobenzene in order to convert them to their corrcsponding benzoic acids.

关键词： carbon dioxide fixation method electrosynthesis chlorobenzene benzoic acid

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Chicken Eggshell as an Innovative Bioflocculant in Harvesting Biofloc for Aquaculture Wastewater Treatment

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Journal of Renewable Materials 2023年第5期11卷 2321-2332页

作者： Hajjar Hartini Wan Jusoh Nor Azman Kasan Hidayah Manan Nurfarahana Mohd Nasir Fareza hanis Mohd Yunos sofiah Hamzah Ahmad Jusoh Faculty of Ocean Engineering Technology and Informatics Universiti Malaysia TerengganuKuala NerusTerengganu21030Malaysia Institute of Tropical Aquaculture and Fisheries(AKUATROP) Universiti Malaysia TerengganuKuala NerusTerengganu21030Malaysia Faculty of Engineering Universiti Putra MalaysiaUPM SerdangSelangor Darul Ehsan43400Malaysia

Implementation of biofloc technology(BFT)system in aquaculture industry shows high productivity,low feed conversion ratio,and an optimum culture *** study was divided into two *** first phase involved maintaining the water quality using the optimum carbon-to-nitrogen ratio by manipulating pH in culture *** second phase examined the performance of harvesting biofloc(remaining phytoplankton and suspended solids in the system)using chicken eggshell powder(CEsP).This study showed that pH 7 to 8 were the best biofloc performance with high removal percentage of ammonia(>99%)with a remaining ammonia concentration of 0.016 mg L^(−1)and 0.018 mg L^(−1),*** second phase of this study was performed to determine the optimal formulation and conditions of using CEsP as a bio-flocculant in harvesting excess *** use of eggshell showed a higher harvesting efficiency of more than 80%under the following treatment conditions:0.25 g L^(−1)of eggshell dosage;with rapid and slow mixing rates of 150 and 30 rpm,respectively;30 min of settling time;settling velocity of 0.39 mm s^(−1)and pH of 6 to ***,the results indicated that biofloc would be the best green technology approach for sustainable aquaculture wastewater and the CEsP is an organic matrix that environmental-friendly bio-coagulant for biofloc harvesting.

关键词： Chicken eggshell aquaculture biofloc coagulant water quality harvesting

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