Military Academy

About: Military Academy is a based out in . It is known for research contribution in the topics: Population & Fuzzy logic. The organization has 2478 authors who have published 3003 publications receiving 33188 citations.

A general and easy computational method for functions of fuzzy numbers

Abstract: Dong and Wong (1987) showed that the discretization method of Schmucker(1984) can give quite irregular and incorrect membership functions. The method of Dubois and Prade (1980) requires that the function be increasing over the solution space; and the nonlinear programming method of Baas and Kwakernaak (1977), although exact, requires very restrictive conditions, and its implementation is cumbersome except for the simplest algebraic functions. Therefore, the aim of the paper is to propose a general and easy computational method for functions of fuzzy numbers. We use the maximum (minimum) nonlinear programming method to derive the upper (lower) bound of the α-cut representation of fuzzy sets. Our nonlinear programming problem is to maximize (minimize) the combination of functions of fuzzy numbers, subject to the interval of the α-cut representation for functions of fuzzy numbers. The method has been implemented in a GINO package, and its results are general and efficient

Electronic properties of AA-stacked nanographite ribbons

Abstract: The interlayer interactions in the AA-stacked nanographite ribbons significantly affect density of states, energy gap, band structure, and free carriers. Density of states exhibits many special structures, including plateau, discontinuities, and divergent peaks. Energy gaps of the semiconducting armchair ribbons decline rapidly as the number of ribbons increases. Most of them could exhibit the semiconductor–semimetal transition. Zigzag ribbons are metallic for any ribbon number, while the low energy density of states is drastically changed by the interlayer interactions. Carrier density also depends on the ribbon width and the edge structure. The AA-stacked nanographite ribbons quite differ from the graphite layers or the AB-stacked nanographite ribbons.

Deposition of polycrystalline AIN thin films by coherent magnetron sputtering at temperatures <80dC

Abstract: A1N thin films were reactively deposited onto Al layers on negatively biased glass and Si substrates at temperatures <80°C by coherent magnetron sputtering. The low temperature deposition of the films without substrate heating was achieved by increasing the target-to-substrate distance, and therefore the heating effect of the plasma is relieved. The microstructure and morphology of the films deposited at different bias voltage and target-to-substrate distance were investigated. The films are amorphous when the target is far from the substrate for a bias voltage up to −320V. When the target-to-substrate distance is decreased to 17 cm a preferred (002) orientation of AIN films is observed at a bias voltage of −240 V. Additionally, the deposited films have specular reflectance and no voids can be observed. This low temperature technique can be used for applications in acoustic wave devices due to the improved homogeneity of the films and step coverage.

Nondestructive regimes of laser pulse annealing of glass and ceramic plates

Abstract: In the context of the uncoupled quasistatic thermoelasticity problem, an analytical relation has been obtained, which is the criterion for thermal resistance of nonmetallic materials subjected to laser pulse annealing. The use of this relation make it possible to identify nondestructive laser treatment regimes and calculate the required thermal resistance of materials, both existent and newly developed. The adequacy of the mathematical model has been experimentally verified.

Perturber's charge effect on Stark broadened hydrogen lines in helium plasmas

Abstract: The Stark line profiles for hydrogen Ly α , Ly β , Hα, and Hβ are calculated using the computer simulation method for helium plasmas in the range of electron concentration from 1018 to 10 19 cm −3 at increasing temperature values kT from 7 to 10 eV , according to the experimental measurements in dense plasmas (Bochum experiment). The calculation was carried out at two limiting assumptions about the perturbers: (a) in the helium plasma only singly ionized helium ions occur, and (b) in the plasma the doubly ionized ions exclusively exist. In the paper the ratio of the calculated full half-widths, FWHM(b)/FWHM(a), for these lines are presented. The ratio equals about to 1.1 for Lyβ and Hβ lines, about 1.0 for Hα, and about 0.9 for Lyα line.