6,855 research outputs found
Stigmaeus corticeus Kuznetsov and Wainstein 1977
No full text<i>Stigmaeus corticeus</i> Kuznetsov and Wainstein, 1977 <p> This species was described from Russia (Tatarstan) from soil (Kuznetsov & Wainstein 1977). It was also recorded from Nort-Eastern Ukraine from moss (Khaustov & Kuznetsov 1997). Faraji & Ueckermann (2006) redescribed this species based on specimens from France. This is the first record of <i>S. corticeus</i> from the Crimean peninsula. Material examined. Three females, CRIMEA: Nikita mountain pasture, about 1250 m.a.s.l., from sod, 12 September 2000, coll. Khaustov A.A.</p>Published as part of <i>Khaustov, Alexander A., 2014, New species and new records of mites of the genus Stigmaeus (Acari: Prostigmata: Stigmaeidae) from Crimea, pp. 237-253 in Zootaxa 3794 (2)</i> on page 246, DOI: 10.11646/zootaxa.3794.2.3, <a href="http://zenodo.org/record/228091">http://zenodo.org/record/228091</a>
Hiding data in the structure of the FAT family file system
No full textThe paper researched the methods of technical steganography, namely, based on the hiding of information messages in the structure of the FAT family file system. The basic method based on changing the numbering of cover files clusters is considered, its advantages and disadvantages are researched. An improved method is proposed that allows to significantly increase size of hidden data. The results of the comparative analysis of hiding data in the structure of the FAT family file system are given
Techniques for Raising the Remainder to a Power in the System of Residual Classes
No full textThe article discusses computer calculations implemented in the system of residual classes. These techniques make it possible to implement fast and reliable arithmetic operations, with the possibility of parallelizing computations. We propose a method of raising the raise integer residues to an arbitrary power of a natural number according to an arbitrary module represented by a system of residue classes. The proposed method is rest on a tabular principle of the implementation of arithmetic operations using the code for information compression of tabular data. The novelty of the material of the article lies in the fact that when implementing the method of raising the remainder of integers by an arbitrary modulus to the power of a natural number, the remainders of the numbers are presented in artificial form. The tabular principle ensures the maximum speed realization of operation of raising the remainder of integers realized in the SRC
Stability conditions on Kuznetsov components
Get PDFWe introduce a general method to induce Bridgeland stability conditions on
semiorthogonal components of triangulated categories. In particular, we prove
the existence of Bridgeland stability conditions on the Kuznetsov component of
the derived category of Fano threefolds and of cubic fourfolds. As an
application, in the appendix, written jointly with Xiaolei Zhao, we give a
variant of the proof of the Torelli theorem for cubic fourfolds by Huybrechts
and Rennemo.Comment: 53 pages. Appendix about the Torelli theorem for cubic fourfolds by
A. Bayer, M. Lahoz, E. Macr\`i, P. Stellari, and X. Zhao. Final version to
appear in Ann. Sci. \'Ec. Norm. Sup\'e
Cryptographically properties of random S-boxes
No full textThe results of studies of the properties of random permutations carried out with the participation of the authors are generalized. It is shown that random substitutions overwhelmingly have good cryptographic, and in particular, algebraic properties. The prospects of using random S-blocks to build block symmetric ciphers with improved dynamic rates of arrival to random substitution are substantiated. A refined model of random substitution and the corresponding criteria are proposed, with the help of which one can verify the suitability of substitutions generated randomly for use in modern cipher designs. It is a check, since with a very high probability the checked substitutions will be suitable
Anatoly Kuznetsov, Author of Babi Yar: The History of the Book and the Fate of the Author
No full textThis Introduction to the special issue devoted to Anatoly Kuznetsov, author of Babi Yar: A Document in the Form of a Novel, dwells on the different aspects of the book’s importance, surveys the life of the author as intertwined with the history of this book, suggests a way of reading his other work in the light of Babi Yar, and notes the contributions of the articles collected in this issue
The data errors control in the modular number system based on the nullification procedure
No full textA method for error control in the modular number system (MNS) based on the use of the zeroing procedure is proposed. Error control in the MNS is a non-positional operation and requires the development of special methods, designed to increase the efficiency of this procedure. This method is designed to verify the correct implementation of the computing process of computer systems and components. It is assumed that the error in one module remainder does not affect the residual values corresponding to other modules (bases) of the MNS. The essence of the proposed method is that, when performing the procedure of zeroing in the MNS, the operation of determining is combined in time, in accordance with the digits ai(i-1) and an(i - i1) +1 of the number A(i-1), the zeroing constant ZC(i) and the calculation operation for the values of ai(i -1) and an(i - - i1) +1 of the following digits ai(+ i)1 and an(i-)i of the number A(i). This makes it possible to increase the efficiency of information control, presented in the modular number system
Paravillersia grata Kuznetsov 1978
No full textParavillersia grata Kuznetsov, 1978 (Figs. 6–9) Paravillersia grata Kuznetsov, 1978: 50, fig. 1. FIGURE 6. Paravillersia grata Kuznetsov, 1978, female: A—seta ve, B—seta sci, C—seta c 1, D—seta e 2, E—seta f 1, F—seta h 1. Supplementary description. FEMALE (Figs. 6–9). Dorsal idiosomal setae not so heavily barbed as in original description (Fig. 6), distinctly thickened distally and sparsely barbed in distal half. Setae c 1 and d 1 almost clavate. Diameter of eyes 12. Length of dorsal setae: vi 37, ve 55, sci 38, sce 45, c 1 37, c 2 20, d 1 40, d 2 40, e 1 53, e 2 43, f 1 58, h 1 44, h 2 37. Distances between setae: vi– vi 37, ve–ve 82, sci–sci 150, c 1 – c 1 140, d 1 – d 1 135, d 2 – d 2 250, e 1 – e 1 135, e 2 – e 2 205, f 1 – f 1 92. Сallosities situated very close to each other (Fig. 7 A); inner callosity bean-like, outer oval. Setae c 2 situated on humeral shield (Fig. 7 A). Length of ventral setae: 1 a 32, 1 b 28, 1 c 26, 2 b 28, 2 c 23, 3 a 31, 3 b 24, 3 c 25, 4 a 24, 4 b 20, 4 c 19, ag 1 18, ag 2 19, ag 3 18, ps 1 20, ps 2 15, ps 3 15. Gnathosoma (Fig. 7 B). Palps as in P. jamaliensis sp. nov. Rostrum of subcapitulum long, similar with that of P. j am al i e n s i s sp. nov. Setae or 1 thickened and curved. Length of subcapitular setae: m 25, n 24, or 1 13, or 2 18. Legs (Figs. 8–9). Empodial raylets weakly capitate. Leg I (Fig. 8 A). Coxae I posterodorsally with seta-like supracoxal setae (el). Setae d on tibia and (p), (tc), (ft) on tarsus represented by eupathidia. Setae d, l” on genu and d on femur distinctly thickened, baculiform, sparsely barbed. Seta k 10. Solenidion ω 21 long, finger-shaped; solenidion φ 12 long baculiform, φp attenuate, 25 long. Leg II (Fig. 8 B). Setae d on tibia, p’ and tc’ on tarsus represented by eupathidia. Setae d on genu and femur distinctly thickened, baculiform, sparsely barbed. Solenidion ω 14 long, finger–shaped; solenidion φ 20 long, attenuate. Seta k 6 long. Leg III (Fig. 9 A). Solenidion ω 6 long, baculiform; solenidion φ 18 long, attenuate. Setae d on tibia, genu and femur distinctly thickened, baculiform, sparsely barbed. Leg IV (Fig. 9 B). Solenidion ω 4 long, baculiform; solenidion φ 21 long, attenuate. Setae d on tibia, genu and femur distinctly thickened, baculiform, sparsely barbed. Material examined. Holotype female, RUSSIA: Voronezh Province, Voronezh, in litter under coniferous, 30 October 1972, coll. N.N. Kuznetsov. Type deposition. The holotype is deposited in the mite collection of the Nikita Botanical Gardence, Yalta, Crimea, Russia. Remarks. The female holotype is in rather bad condition, especially idiosoma and I provided only supplementary description because some body structures are almost invisible. The dorsal body setae are not so heavily barbed as in the original description. Setae c 2 are situated on the humeral shield instead out of the shield in the original description.Published as part of Khaustov, Alexander A., 2014, A new species of the genus Paravillersia (Acari: Prostigmata: Stigmaeidae) from Western Siberia, with supplementary description of Paravillersia grata Kuznetsov, 1978 in Zootaxa 3873 (1), DOI: 10.11646/zootaxa.3873.1.5, http://zenodo.org/record/22878
Testing of Code-Based Pseudorandom Number Generators for Post-Quantum Application
No full textThis article presents the results of studies of design pseudorandom sequence generators using code-based cryptosystems. The resistance of this generators type is based on the complexity of solving the syndrome decoding problem, which allows to provide resistance to classic cryptanalysis and cryptanalysis using quantum computing. The article describes the principles of constructing a classic Fisher-Stern generator and proposes a new approach to design a code-based generator that can be applied in the post-quantum period. Heuristic testing of the presented generators was also conducted in terms of a period length, a sequence generation speed, and a resistance of the generators, which revealed the Fisher-Stern generator deficiency. It is a difference between a theoretical and a practical period of the generated sequences, which is eliminated in the proposed generator by adding two components: a linear feedback shift register and an adder
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