Materials Literature
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The LD converter slag plays an important role in the refining process, mainly in relationship to phosphorus removal. Much is known about the physicochemical characteristics of the slag and its relationship to the process efficiency; however few employ the microstructural aspect for such analysis. In this sense, the ai…
Maraging steels are alloys with Ni-Co-Mo-Ti with ultra-high resistance and broad application, with fundamental interest in the aerospace sector due to high mechanical resistance combined with a good fracture toughness. This steel has been proposed to replace the steels 300M and 4340 in the Brazilian rocket engine case…
For a better understanding of the behaviour of old brick masonry in facing the rising damp problem, multiple tests were made in the laboratory: water absorption, moisture content, apparent porosity, temperature and thermal camera imaging on brick masonry and its components: brick and mortar. This has allowed us to det…
The production of cleaner steel has been demand for a growing market in Brazil and worldwide; and for such steels with low level of inclusions, refinement with addition of calcium has been widely used. That addition leaves a remainder of calcium in steel which may form phases of low melting point with silica and alumi…
Chelating resins are suitable materials for the removal of heavy metals in water treatments. A copolymer, Poly(MMA-co-MA), was synthesized by radical polymerization of maleic anhydride (MA) and methyl methacrylate (MMA), characterized and transformed into multifunctional nanochelating resin beads (80–150 nm) via hydro…
On the basis of Navier — Stokes linear equations for the case of Lame “ thin layer ”, a technique of generating an exact self - similar solution to the hydrodynamic calculation of the elastically deformable thrust bearing with the pr ofile adapted to its bearing surface operating on a three - layer lubricant is presen…
A production facility model to be used und er the deep - hole drilling of large - diameter tube plates with a heterogen eous structure made of hard - to - machine materials is presented. Dynamic properties of the object as a composite membrane with several anchorage points are analyzed. Modes of the workpie ce vibrati…
The asymptotic solution to the problem on the hydrodynamic calculation of the porous double - layer r a dial finite length bearing is provided on the eccentricity ratio levels. The solution is based on full nonlinear Navier — Stokes equations, and on Darcy’s equation. The distinction of the suggested design model is t…
A supplementary friction group in the clutch design increases its load capacity. It is a decided adv antage of adaptive friction clutches of the second generation with combine d feedback. The feedback gain changes depending on the friction coefficient value. The problem of establishing such patterns, and the synthesis…
Some issues of applying the stochastic simulation modeling to the description and stud ying of DNA’s end structures (telomeres) shortening mechanisms are considered. The aim of this research is to study — on the base of the st ochastic and simulation modeling — processes in the cells leading to the telomeres’ length s…
editorial
The authors have previously studied two - dimensional Fredholm integral operators with homogeneous kernels of fiber - singular type. For this class of operators, the symbolic calculus is built using the theory of biloc al operators by V. Pilidi, and Fredholm criterion is formulated through the inversibility of t wo fa…
The applicability of the bionic techniques of artificial bee colonies for the implementation of the classical transpos ition cipher cryptanalysis is considered. The problem is a classical optimization problem to the solution of which the known techniques of artificial bee colonies fallen within a relatively new class…
Simulating a piezoelectric generator which is an element of the energy storage device is considered. A piezoelectric generator appears a cantilever - mounted plate on which the piezoelectric elements are glued, and the inertial mass is attached. Two options of the plate vibration exc itation are investigated. In the f…
The application of a new system - cybernetic approach to the power system synchronous generator control with r egard to their nonlinearity, multidimensionality, and multicoupling, is shown. The main study subject is a nonlinear model of the synchronous generator operating for a high power network. A synergistic synthe…
An axial ly symmetric quasistatic thermoelasticity problem on the indentation of a flat - ended cylindrical punch with a constant temperature at its base into the functionally - graded half - space which elasticity modulus, Poisson ratio, heat conductivity and expansion coefficients are independently continuously vary…
The possibilit y to increase feedback gain and operation accuracy of the adaptive friction clutch is r e vealed at the expense of the friction couple separate force closure of the basic and supplementary friction groups . The load cha racteristic of the clutch is presented i n the form of a curve monotonically i n cre…
Acoustic screens are one of the means to provide sound insulation and noise reduction on its path fr om the source to the target point (TP, the workplace). The advantages of the acoustic screens are constru c tive simplicity, light weight, and relat ively low cost. A distin c tive feature of an acoustic screen as a so…
A solution to the problem on describing experimentally obtained dependences is considered. The autho r’s method is based upon getting some local approximations of fragments of these relations, and their additive reduction to a single analytical expression. This effect is determined using special “allocating” functions…