Results 221 to 230 of about 2,345 (277)

An efficient image encryption scheme based on double affine substitution box and chaotic system

The Integration VLSI Journal, 2021
Privacy of information is one of the most important and unavoidable issues in our digitally advance era. A huge amount of information transmitted over different servers and networking protocols.
Majid Khan, Sajjad Shaukat Jamal, Mohammad Mazyad Hazzazi   +2 more
exaly   +2 more sources

Algorithm for determining pure pointedness of self-affine tilings

Advances in Mathematics, 2011
Overlap coincidence in a self-affine tiling in Rd is equivalent to pure point dynamical spectrum of the tiling dynamical system. We interpret the overlap coincidence in the setting of substitution Delone set in Rd and find an efficient algorithm to check
Shigeki Akiyama
exaly   +2 more sources

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Substitution & transposition on images by using advanced affine cipher

2014 International Conference on Multimedia Computing and Systems (ICMCS), 2014
Abdelmalek Azizi
exaly   +2 more sources

Electron affinities of substituted nitrobenzenes

Canadian Journal of Chemistry, 1989
The electron affinities of 14 substituted nitrobenzenes including nitrobiphenyls were determined by measurement of electron transfer equilibria [1] in the gas phase with a pulsed high pressure mass spectrometer: A− + B = A + B− [1]. These data, when combined with previous determinations from this laboratory, lead to electron affinities for 35 ...
S. Chowdhury, H. Kishi, G. W. Dillow, P. Kebarle   +3 more
openaire   +2 more sources

Proton affinities of substituted cyanides

Journal of Molecular Structure: THEOCHEM, 1986
Abstract Molecular orbital calculations at the ab initio STO-3G, 3–21G, 4–31G, and 6–31G* bases have been made for the relative proton affinities of an extended series of substituted cyanides, XCN. It is shown that geometry optimization at the 3–21G level is adequate and that 3–21G//3–21G calculations give very similar results to those obtained at ...
Stephen Marriott, Ronald D. Topsom, Carlito B. Lebrilla, Ilmar Koppel, Masaaki Mishima, Robert W. Taft   +5 more
openaire   +1 more source

Proton affinities of substituted methylamines

Journal of Molecular Structure: THEOCHEM, 1989
Abstract Molecular orbital calculations at the ab initio STO-3G, 3-21G, 6-31G and 6-31G∗ (5D) bases have been performed for the relative proton affinities of an extended series of substituted methylamines, XCH2NH2. The minimal basis STO-3G calculations give closest agreement with experiment averaged over all substituents for which comparisons are ...
Tony Silvestro, Ronald D. Topsom, Charles W. Bock, Robert W. Taft   +3 more
openaire   +1 more source

Electrophile Affinity: A Reactivity Measure for Aromatic Substitution

Journal of the American Chemical Society, 2009
The reactivity and regioselectivity of the electrophilic chlorination, nitration, and alkylation of benzene derivatives were rationalized by comparing literature data for the partial rate factors (ln f) for these S(E)Ar processes with theoretical reactivity parameters.
Gergana, Koleva, Boris, Galabov, Judy I, Wu, Henry F, Schaefer, Paul von R, Schleyer   +4 more
openaire   +2 more sources

Vertical electron affinities in substituted trimethylsilanes

Journal of Organometallic Chemistry, 1997
Abstract The gas-phase negative electron affinities obtained by means of electron transmission spectroscopy (ETS) in the series (CH3)3SiX (with X = I, Br, Cl, Si(CH3)3, SCH3, OCH3, N(CH3)2, CH3) are compared. The electron-acceptor properties of these compounds increase when the substituent contains third-row (or heavier) elements.
MODELLI A, SCAGNOLARI F, DISTEFANO, Giuseppe, DAL COLLE, Maurizio   +3 more
openaire   +1 more source

Systematically Modulating Aptamer Affinity and Specificity by Guanosine-to-Inosine Substitution

Analytical Chemistry, 2022
Aptamers are widely used in small molecule detection applications due to their specificity, stability, and cost effectiveness. One key challenge in utilizing aptamers in sensors is matching the binding affinity of the aptamer to the desired concentration range for analyte detection.
Brea A. Manuel, Sierra A. Sterling, Aimee A. Sanford, Jennifer M. Heemstra   +3 more
openaire   +2 more sources

Intrinsic proton affinity of substituted aromatics

1998
It is shown that the MP2(fc)/6-31G*//HF/6-31G* + ZPE(HF/6-31G*) model reproduces very well the experimental proton affinities in a large number of substituted benzenes and naphthalenes. Extensive applications of this model revealed that the proton affinity of polysubstituted aromatics followed a simple additivity rule, which have been rationalized by ...
Maksić, Zvonimir, Maksić, Mirjana
openaire   +1 more source