Linear-Differential Cryptanalysis for SPN Cipher Structure and AES

0 Introduction Substitution and permutation network (SPN) structure is one of the most widely used structures in block ciphers. The SPN structure is based on Shannon’s principles of confusion and diffusion[1] and these principles are implemented through …     

Significant overestimation of global aerosol optical thickness by MODIS over land

Global aerosol optical thickness (AOT) data over land obtained from the Moderate Resolu-tion Imaging Spectroradiometer (MODIS) are evaluated through comparisons with AOT data retrieved by Aerosol Robotic Network (AERONET). In general, MODIS overestimates AOT except at a few AERONET sites in Africa and eastern Asia. MODIS/AOTs are, on average, larger than AERONET/AOTs by 0.041 and 0.090 at 470 nm and 660 nm, respectively. The AOT bias at 660 nm is significantly correlated to the surface reflectance at 2130 nm. Both facts suggest that the underestimation of the surface reflectance is the principal reason for this bias at 660 nm. To use the MODIS/AOT at 470 nm is strongly recommended because it is much more reliable than the AOT at 660 nm.     

The existence of global solution and their weak limit of generalized Ginzburg-Landau equations in two dimensions

By the uniform a priori estimate of solution about parameters, we prove the existence of global solution and inviscid limit to a generalized Ginzburg-Landau equations in two dimensions. We also prove that the solution to the Ginzburg-Landau equations converges to the weak solution to the derivative nonlinear Schrödinger equations.     

Qualitative analysis of a strongly coupled prey-predator model

This paper investigates a strongly coupled reaction-diffusion model with Holling-II reaction function in a bounded domain with homogeneous Neumann boundary condition. The sufficient condition for the existence and non-existence of the non-constant positive solutions are obtained. Moreover, we prove that the nonlinear diffusion terms can create non-constant positive equilibrium solutions when the corresponding model without nonlinear diffusion term fails.     

Synthesis and properties of a Pr(III) complex with 2-acetyl- benzimidazoledehyde-glycine Schiff-base ligand

Exhibiting a broad spectrum of biological activities and outstanding optical properties, complexes of d- and rare-earth metals Schiff-base type ligands derived from amino acids attract a great interest of researchers in recent years[1-4]. The metel comple…     

三锥水介旋流器的高硫煤脱硫降灰及其分选原理

为实现高硫煤的脱硫降灰,采用三锥水介旋流器,取华恒高硫煤小于3 mm粒级的煤样进行脱硫实验,探讨三锥旋流器脱硫降灰的粒度下限,分析颗粒在三锥水介旋流器内部的运动特性,得到了颗粒径向速度与颗粒密度和粒度、所处的径向位置、颗粒的切向角速度以及颗粒轴向位置等变量的函数关系式。结果表明:三锥水介旋流器的降灰粒度下限为0.125 mm,脱除黄铁矿硫粒度下限为0.074 mm。该旋流器中产生的自生介质和前两段锥体连接处的淘析作用可以使三锥水介旋流器实现高效分选。     

Surface tension and specific heat of liquid Ni<Subscript>70.2</Subscript>Si<Subscript>29.8</Subscript> alloy

The thermophysical properties of liquid alloys in me-tastable state are of importance for liquid-solid phase transformation under nonequilibrium conditions[1―10]. Sur-face tension and specific heat, two of the most important thermophysical properties, have significant influences on the process of crystal nucleation and growth. Furthermore, it is necessary to obtain these data so as to perform quan-titative research on rapid solidification[3―10]. The tradi-tional measurement methods, however,…     

Image segmentation via mean shift and loopy belief propagation

This paper presents a novel approach that can quickly and effectively partition images based on fully exploiting the spatially coherent property. We propose an algorithm named iterative loopy belief propagation(iLBP) to integrate the homogenous regions and prove its convergence. The image is first segmented by mean shift(MS) algorithm to form over-segmented regions that preserve the desirable edges and spatially coherent parts. The segmented regions are then represented by region adjacent graph(RAG) . Motiv...