Color Image Encryption in CIE L*a*b* Space

Jin, Xin; Chen, Yingya; Ge, Shiming; Zhang, Kejun; Li, Yuzhen; Liu, Yanping; Guo, Kui; Tian, Yulu; Zhao, Geng; Zhang, Xiaokun; Wang, Ziyi

doi:10.1007/978-3-662-48683-2_8

Cited by 13 publications

(3 citation statements)

References 6 publications

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“…The formed heterointerfaces in bimetal chalcogenide can increase the number of catalytically active sites and provide favorable local coordination and electronic structures. [ 20,21 ] For example, the bimetallic chalcogenides, such as ZnS‐SnS, [ 22 ] MoS 2 /Ni 3 S 2 , [ 23 ] and CoSe‐ZnSe [ 24 ] enable electronic reconfiguration and improve the intrinsic activity for promoting sulfur conversion by the interior built‐in electric‐field ( E ‐field) induced by phase boundaries. Although promising progress has been made, electrocatalytic activity is still unsatisfactory for a well‐functioning Li−S battery in terms of boosting the entire sulfur conversion reaction.…”

Section: Introductionmentioning

confidence: 99%

Synergetic Anion Vacancies and Dense Heterointerfaces into Bimetal Chalcogenide Nanosheet Arrays for Boosting Electrocatalysis Sulfur Conversion

Jiang

et al. 2022

Advanced Materials

108

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The slow sulfur conversion reactions severely limit the electrochemical performances of Li−S batteries especially under high sulfur loading and lean electrolyte operation. [6,7] An electrocatalytic approach to boost sulfur conversion reaction in Li−S chemistry has recently been proposed as an effective strategy to overcome these limitations. [8][9][10][11][12] Transition metal chalcogenides (TMCs) are recognized to be effective sulfur electrocatalysts because of their abundance, environment friendliness, and unique electrochemical properties. [13][14][15][16][17] Among them, metal sulfides arouse particular interest because of their high activity, and thermodynamically stable structures. [18] However, TMCs are still suffered from insufficient active sites, inferior durability, and weak conductivity. The notable enhancement of catalytic activity for sulfur redox reaction can be achieved by regulating the morphology and internal crystal structure of TMCs. As for morphology control, in situ growing 2D TMC nanosheet arrays with abundant electroactive sites on conductive substrates could provide efficient pathways for electron/ion transport during the sulfur conversion process. [19] Moreover, it was demonstrated that bimetal chalcogenide hetero-catalysts exhibited higher activity than the single-component counterparts. The formed heterointerfaces in bimetal chalcogenide can increase the number of catalytically active sites and provide favorable local coordination and electronic structures. [20,21] For example, the bimetallic chalcogenides, such as ZnS-SnS, [22] MoS 2 /Ni 3 S 2 , [23] and CoSe-ZnSe [24] enable electronic reconfiguration and improve the intrinsic activity for promoting sulfur conversion by the interior built-in electric-field (E-field) induced by phase boundaries. Although promising progress has been made, electrocatalytic activity is still unsatisfactory for a wellfunctioning Li−S battery in terms of boosting the entire sulfur conversion reaction.The introduction of anion vacancies provides another effective strategy to enhance the electrocatalytic activity of TMCs toward boosted Li−S battery upon discharging/charging process. [25][26][27] Electrons in the Se-defect can be excited into the conduction band, producing a low bandgap in the conduction band which is favorable to the sulfur conversion reaction. [28] Moreover, sulfurvacancies (S-vacancies) can regulate the electronic structure of adjacent atoms, thus reducing the decomposition energy barrier Vacancy and interface engineering are regarded as effective strategies to modulate the electronic structure and enhance the activity of metal chalcogenides. However, the practical application of metal chalcogenides in lithium− sulfur (Li−S) batteries is limited by their low conductivity, rapid decline in catalytic activity, and large volume variation during the discharging/charging process. Herein, bimetal sulfide (CoZn-S) nanosheet arrays with sulfur vacancies and dense heterointerfaces are proposed to accelerate sulfur conversion and improve the perform...

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Section: Introductionmentioning

confidence: 99%

Synergetic Anion Vacancies and Dense Heterointerfaces into Bimetal Chalcogenide Nanosheet Arrays for Boosting Electrocatalysis Sulfur Conversion

Jiang

et al. 2022

Advanced Materials

108

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“…[ 5 ] In the last decades, tremendous efforts have been made to mitigate the above issues through a combination of sulfur and various conductive hosts by chemical and/or physical interaction. [ 6–10 ] Although the cycle stability and rate ability of those sulfur cathodes are obviously improved, the inactive hosts contribute to the dead weight, which leads to low sulfur content in the entire electrodes, inhibiting the practical application of LSBs. Modification of separators (including interlayers) in LSBs has been verified to be a simple and effective strategy to suppress the polysulfides’ shuttle effect.…”

Section: Introductionmentioning

confidence: 99%

A Mott–Schottky Heterogeneous Layer for Li–S Batteries: Enabling Both High Stability and Commercial‐Sulfur Utilization

Shi

Zheng

Zhang

et al. 2022

Advanced Energy Materials

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electric vehicles. [1,2] However, the further scaled application of commercial LIBs encounters a "bottleneck": the overall energy density is approaching the ceiling due to the restriction of theoretical specific capacity of insertion-type oxide cathodes (≈250 mAh g −1 ) and graphite anodes (372 mAh −1 ). In order to satisfy the increasing demand for higher energy densities particularly under the extended application such as unmanned aerial vehicles, cargo aircraft, electric vehicles, and the exploration of novel storage system is of great significance. [3] Sulfur is earthabundant, low-cost, and environment friendly. More inspiring, lithium-sulfur batteries (LSBs) based on sulfur cathodes exhibit much higher theoretical specific capacity (1675 mAh g −1 ) through the multielectron redox reaction process, showing great potential for high-performance energy storage devices. [4] Despite the promising prospects, the practical application of LSBs is still impeded by several challenges, such as electrical insulation of sulfur and discharge products (Li 2 S/Li 2 S 2 ), severe shuttle effect of long-chain polysulfides (LiPSs, Li 2 S n , 4 ≤ n ≤ 8), low sulfur utilization, and large volume expansion (≈80%), which are critically fatal for the cycle stability and power density. [5] In the last decades, tremendous Lithium-sulfur batteries (LSBs) are severely impeded by their poor cycling stability and low sulfur utilization due to the inevitable polysulfide shuttle effect and sluggish reaction kinetics. This work reports a Mott-Schottky RGO-PANI/MoS 2 (RPM) heterogeneous layer modified separator for commercialsulfur-based LSBs through the vertical growth of molybdenum sulfide (MoS 2 ) arrays on the polyaniline (PANI) in situ reduced graphene oxide (RGO). Due to the synergistic effects of the "reservoir" constructed by MoS 2 and RGO-PANI, strong absorbability, high conductivity, and electrocatalytic activity, RPM exhibits a successive "trapping-interception-conversion" behavior toward lithium polysulfides. As a result, the LSBs assembled using a commercialsulfur as the cathode and RPM as modified layer exhibit high sulfur utilization (3.8 times higher than that of the unmodified separator at 5 C), excellent rate performance (553 mAh g −1 at 10 C), and outstanding high-rate cycle stability (524 mAh g −1 after 700 cycles at 5 C). Moreover, even at a high sulfur loading of 5.4 mg cm −2 , a favorable areal capacity of 3.8 mAh cm −2 is still maintained after 80 cycles. Theoretical calculations elucidate that such a systematic strategy can effectively suppress the shuttling effect and boost the catalytic conversion of intercepted polysulfides. This work may provide a feasible strategy to promote the practical application of commercial-sulfur-based LSBs.

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“…Figure11 Histogram analysis of the Arabic language. (a1), (b1) and (c1) histograms of plain table that were chosen randomly.…”

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confidence: 99%

A Chaos-Based Encryption Algorithm for Database System

Albahrani

Lafta²,

Ghayad³

2023

JCSANDM

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This paper introduces a new Database Transposition, Substitution and XORing Algorithm (DTSXA) based on using chaotic maps. It is based primarily on two well-known security properties: confusion and diffusion. A random number generator was depended on to produce the keys for the algorithm of encryption and decryption. The encryption of the Arabic language in addition to the English language was done, besides it can encrypt a table, individual row and individual column. The suggested algorithm was obeyed and analyzed by different tests involving brute force attack analyses, statistical attack analyses (security analysis histogram, correlation coefficient analysis and information entropy analysis), key sensitivity analysis, differential attack analysis, and mean square error analysis. This algorithm passed all the applied analyses well-deservedly, which indicates that the presented encryption algorithm has a high security level due to its large key space and high sensitivity to the change in the cipher keys.

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Color Image Encryption in CIE Lab* Space

Cited by 13 publications

References 6 publications

Synergetic Anion Vacancies and Dense Heterointerfaces into Bimetal Chalcogenide Nanosheet Arrays for Boosting Electrocatalysis Sulfur Conversion

Synergetic Anion Vacancies and Dense Heterointerfaces into Bimetal Chalcogenide Nanosheet Arrays for Boosting Electrocatalysis Sulfur Conversion

A Mott–Schottky Heterogeneous Layer for Li–S Batteries: Enabling Both High Stability and Commercial‐Sulfur Utilization

A Chaos-Based Encryption Algorithm for Database System

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