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| 1 | Heat-induced Internal Strain Relaxation and its Effect on the Microstructure of Polyacrylonitrile-based Carbon Fiber显示文摘The transformation of the internal strain and its effect on the microstructure of polyacrylonitrile-based carbon fiber during the high-temperature graphitization were investigated.The internal compressive strain within the carbon turbostratic structure was confirmed through a careful analysis by wide-angle X-ray diffraction and Raman spectroscopy.Heat-induced strain/stress relaxation along the fiber axis was observed and was found to have a profound effect on the structure of both the crystallites and microvoids.The results indicated that,the relaxation of residual strain changed the graphite layers from a wrinkled and distorted morphology to a straight and smooth one,and consequently led the crystallites to stack closely and orderly with increasing stack height.The strain relaxation also changed the morphology of crystallites and microvoids,resulting in an anisotropic growth for the latters. | Denghua Li Chunxiang Lu Gangping Wu Yu Yang Zhihai Feng Xiutao Li Feng An Baoping Zhang | 2014 | Journal of Materials Science & Technology2014，30，10： | 5 |
| 2 | Ultra-wide-dynamic-range gas sensing by optical pathlength multiplexed absorption spectroscopy显示文摘Laser absorption spectroscopy(LAS) has become the most widely used laser spectroscopic technique for gas detection due to its capability of accurate quantification and straightforward operation. However, since resolving weak absorption and averting over-absorption are always mutually exclusive, the dynamic range of the LAS-based gas sensor is limited and insufficient for many applications in fundamental study and industry. To overcome the limitation on the dynamic range, this article reports optical pathlength(OPL) multiplexed absorption spectroscopy using a gas cell having multiple internal reflections. It organically fuses together the transmission and reflection operation modes: the former directly uses the entire OPL of the gas cell, while the latter interrogates different internal short OPLs by optical interferometry, yielding >100-fold OPL variation. The achieved dynamic range is more than 6 orders of magnitude that surpasses other LAS techniques by 2–3 orders of magnitude. The proposed method promotes a novel way for the development of large-dynamic-range spectroscopic gas sensors for fundamental studies and industrial applications. | XIUTAO LOU YABO FENG SHUNHU YANG YONGKANG DONG | 2021 | Photonics Research2021，9，2： | 4 |
| 3 | On Algebraic Immunity of Trace Inverse Functions on Finite Fields of Characteristic Two显示文摘The trace inverse functions Tr(λx^(-1)) over the finite field F_(2~n) are a class of very important Boolean functions and are used in many stream ciphers such as SFINKS,RAKAPOSHI,the simple counter stream cipher(SCSC) presented by Si W and Ding C(2012),etc.In order to evaluate the security of those ciphers in resistance to(fast) algebraic attacks,the authors need to characterize algebraic properties of Tr(λx^(-1)).However,currently only some bounds on algebraic immunity of Tr(λx^(-1)) are given in the public literature,for example,the NGG upper bound and the Bayev lower bound,etc.This paper gives the exact value of the algebraic immunity of Tr(λx^(-1)) over F_(2~n),that is,AI(Tr(λx^(-1))) =[2n^(1/2)]- 2,where n ≥ 2,A ∈ F_(2~n) and λ≠ 0,which shows that Dalai's conjecture on the algebraic immunity of Tr(λx^(-1)) is correct.What is more,the authors demonstrate some weak properties of Tr(λx^(-1)) against fast algebraic attacks. | FENG Xiutao GONG Guang | 2016 | Journal of Systems Science & Complexity2016，29，1： | 1 |
| 4 | The Adjacency Graphs of a Class of LFSRs and Their Applications显示文摘Nonlinear feedback shift registers(NFSRs)are widely used in communication and cryptography.How to construct more NFSRs with maximal periods,which can generate sequences with maximal periods,i.e.,de Brujin sequences,is an attractive problem.Recently many results on constructing de Bruijn sequences from adjacency graphs of Linear feedback shift registers(LFSRs)by means of the cycle joining method have been obtained.In this paper we discuss a class of LFSRs with characteristic polynomial p^2(x),where p(x)is a primitive polynomial of degree n≥2 over the finite field F2.As results,we determine their cycle structures and adjacency graphs,and further construct a class of new de Bruijn sequences from these LFSRs. | WANG Hui FENG Xiutao | 2019 | Chinese Journal of Electronics2019，28，6： | 0 |
| 5 | Straightforward Guess and Determine Analysis Based on Genetic Algorithm显示文摘With the development of artificial intelligence,the genetic algorithm has been widely used in many fields.In cryptography,the authors find it is natural to code an individual and design its fitness in a genetic algorithm for a straightforward guess and determine analysis(SGDA,in short).Based on this observation,the authors propose an SGDA based on genetic algorithm.Comparing it with the other three SGDAs based on exhaustive search,MILP method and CPP method respectively,the authors illustrate its effectiveness by three stream ciphers:Small scale SNOW 2.0,medium scale Enocoro-128v2 and large scale Trivium.The results show our method is significantly superior to them,especially for Trivium,the method can find a solution of 165 variables in less than one hour,while the other three methods are not applicable due to its enormous search space of size 2^(619.37).As far as we know,it is a best solution in an SGDA for Trivium so far. | CAO Chunping CEN Zhe FENG Xiutao WANG Zhangyi ZHU Yamin | 2022 | Journal of Systems Science & Complexity2022，35，5： | 0 |
| 6 | Classification and counting on multi-continued fractions and its application to multi-sequences显示文摘In the light of multi-continued fraction theories, we make a classification and counting for multi-strict continued fractions, which are corresponding to multi-sequences of multiplicity m and length n. Based on the above counting, we develop an iterative formula for computing fast the linear complexity distribution of multi-sequences. As an application, we obtain the linear complexity distributions and expectations of multi-sequences of any given length n and multiplicity m less than 12 by a personal computer. But only results of m=3 and 4 are given in this paper. | DAI ZongDuo FENG XiuTao | 2007 | Science in China(Series F)2007，50，3： | 0 |
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