The effect of defect complexes on the stability, structural and electronic properties of single-walled carbon nanotubes and boron nitride nanotubes is investigated using the ab initio pseudopotential density functional method implemented in the Castep code. We found more substantial atomic relaxations in the zig-zag carbon nanotube than the armchair one. We find that the B(C)B(c) defect introdu...

We started out with a goal to reduce the probability of error in randomized computation. We saw that using independent runs of the randomized algorithm and then taking majority helps us amplify the success probability. However, this method uses a lot more randomness, often a costly resource, and we would like to amplify the success probability using almost the same amount of randomness as the o...

We explore the consequences of imposing Polyakov’s zig/zag-invariance in the search for a confining string. We first find that the requirement of zig/zaginvariance seems to be incompatible with spacetime supersymmetry. We then try to find zig/zag-invariant string backgrounds on which to implement the minimal-area prescription for the calculation of Wilson loops considering different possibiliti...

A family of expanders is a family of graphs Gn = (Vn, En), |Vn| = n, such that each graph is dn-regular, and the edge-expansion of each graph is at least h, for an absolute constant h independent of n. Ideally, we would like to have such a construction for each n, although it is usually enough for most applications that, for some constant c and every k, there is an n for which the construction ...

Introduction: Isotopic shifts in 150 Sm/ 149 Sm and 158 Gd/ 157 Gd caused by neutron capture effects are useful indicators to characterize the interaction of cosmic rays with planetary materials in space, because 149 Sm and 157 Gd have very large thermal neutron capture cross sections. A recent neutron capture study of the Sm and Gd isotopes of Pesyanoe also shows significant variations of neut...

an experiment was conducted at zahak research station in zabol in 1996-97 to determine the best method of planting and plant density for mixed culture of cucumber and eggplant. in this experiment, yields of two crops were compared in individual and mixed cultures. in both systems the distances between two plant were 25 and 50 cm, and in the mixed culture eggplants were planted in the opposite o...

Zinc-α2-glycoprotein (ZAG) is a recently identified adipokine, assigned to the chromosome 7q22.1. It is a multidisciplinary protein, which is secreted in various body fluids. The ZAG plays roles in lipolysis, regulation of metabolism, cell proliferation and differentiation, regulation of melanin synthesis, cell adhesion, immunoregulation, and so forth. Vitiligo is the most common depigmenting s...

Despite the rarity, large negative linear compressibility (NLC) was observed in metal-organic framework material Zn(HO3PC4H8PO3H)∙2H2O (ZAG-4) in experiment. We find a unique NLC mechanism in ZAG-4 based on first-principle calculations. The key component to realize its large NLC is the deformation of H3O(+) tetrahedron. With pressure increase, the oxygen apex approaches and then is inserted int...

In this work, we present a comparison between two techniques of image compression. In the first case, the image is divided in blocks which are collected according to zig-zag scan. In the second one, we apply the Fast Cosine Transform to the image, and then the transformed image is divided in blocks which are collected according to zig-zag scan too. Later, in both cases, the Karhunen-Loève trans...