It is shown that the extended quadratic residue code of length 20 over GF(7) is a unique self-dual [20, 10, 9] code C such that the lattice obtained from C by Construction A is isomorphic to the 20-dimensional unimodular lattice D 20, up to equivalence. This is done by converting the classification of such self-dual codes to that of skew-Hadamard matrices of order 20.

The largest minimum weight of a self-dual doubly-even binary (n, k, d) code is d = 4bn/24c+ 4. Of such codes with length divisible by 24, the Golay Code is the only (24, 12, 8) code, the Extended Quadratic Residue Code is the only known (48, 24, 12) code, and there is no known (72, 36, 16) code. One may partition the search for a (48, 24, 12) self-dual doubly-even code into 3 cases. A previous ...

The problems of catalyst deactivation and optimization the mixed feedstock become more relevant when residues are involved as a catalytic cracking feedstock. Through numerical experimental studies cracking, we optimized composition in order to minimize by coke. A pure vacuum gasoil increases yields wet gas gasoline (56.1 24.9 wt%). An increase ratio up 50% reduces yield due 19.9%. However, this...

The practicability of a pyrometallurgical scheme for raw material processing is established as result the analysis methods intended to dearsenate and process gold-arsenic concentrates well equipment execution. conceptual design vacuum without forced movement dispersed in sublimator reaction zone materials proposed. In-process tests sublimation arsenic sulfides from gravity flotation received Ba...

The first part of the project is mainly about changing of slag compositions and see it affect on the inclusions in the ladle furnace. The second part of the project is to study the influence of stirring (EMGAS) on the large inclusions in the steel by changing stirring conditions. The project has done at Uddeholm AB, Hagfors. First, the scrap is melted in ARC furnace then moved to the ladle de-s...

The toric residue is a map depending on n + 1 divisors on a complete toric variety of dimension n . It appears in a variety of contexts such as sparse polynomial systems, mirror symmetry, and GKZ hypergeometric functions. In this paper we investigate the problem of finding an explicit element whose toric residue is equal to one. Such an element is shown to exist if and only if the associated po...

Objective: The main objective pursued in this paper is to investigate the energy consumption for drying of potato slices using vacuum-infrared drying method. Methods: Drying of potato slices with the thicknesses of 1, 2 and 3 mm were conducted at vacuum levels of zero (without vacuum), 20, 80 and 140 mm [Hg], infrared radiation at power levels of 100, 150 and 200 W in the three repetition. Resu...

Objective: The main objective pursued in this paper is to investigate the energy consumption for drying of potato slices using vacuum-infrared drying method. Methods: Drying of potato slices with the thicknesses of 1, 2 and 3 mm were conducted at vacuum levels of zero (without vacuum), 20, 80 and 140 mm [Hg], infrared radiation at power levels of 100, 150 and 200 W in the three repetition. Resu...

Upgrading the coal is a process that increases calorific value of low-rank through decreasing moisture content coal. This method usually uses mixed heavy oil to close opened pores after upgrading. The additives have molecule structure like oil. aim this study determine effect on and upgrading process. Coal in applies several variations i.e., particle size mass with an additive which mixture vac...