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Editorial: Materials Research - Ibero-american Journal of Materials

Effect of specimen size and loading conditions on indirect tensile test results

Due to the difficulties inherent in the direct measurement of concrete tensile strength, experimental methods have been devised to determine this property indirectly. One such method, the splitting or indirect tensile test, also known as the Brazilian test, is widely used for its convenience and applicability to fresh…

Synthesis and characterization of novel organotin carboxylate maleimide monomers and copolymers

Two novel tributyltin carboxylate maleimide monomers, tributyltin(maleimido)acetate and tributyltin(4-maleimido)benzoate, were synthesized by condensation reaction of maleimidoacetic acid or 4-maleimidobenzoic acid with bis(tributyltin) oxide. Copolymerization of these monomers with styrene was carried in dioxane at 7…

MODELING THE ALLOCATION OF HAZARDOUS SUBSTANCES INTO THE AIR OF WORKING AREA STATIONS RUN THE MACHINE-BUILDING PLANTS

We obtain polynomial dependence, which can be used for theoretical calculation of the most likely content of harmful substances in exhaust gases at various operating modes of the machines when they were run and tested and, subsequently, to predict the quality of air in industrial premises obkatochnyh sites that will h…

THE DYNAMIC PROPERTIES OF THE CENTRIFUGAL DEVICE FOR THE SUPERFICIAL ENTERING OF MINERAL FERTILIZERS

The research of dynamic properties of the centrifugal devices for distribution of mineral fertilizers on a field surface adaptably to substantiation of the admissions on fluctuation of the process parameter. The admissions on proportionality of giving of the fertilizers on a distributing device, an average quadratic i…

INFORMATIONAL SYSTEM FOR PROGRAM PERFORMANCE ESTIMATION

Huge amount of similar informational systems available today inevitably causes the problem of 'the right choice'. There are plenty of ways to estimate product quality today, however most of them either gives subjective results or requires plenty of computations to be made by user. An alternate way of comparing two or…

DAMPING OF THE VIBRATIONS OF A GRIPPING DEVICE OF AN INDUSTRIAL ROBOT IN A REGIME OF A TWO CURRENTS DYNAMIC SLOWDOWN OF AN ASYNCHRONOUS MOTOR WITH FREQUENCY CONTROL

A method of reducing the amplitude of fluctuations in moving body of the industrial robot, gripping device in positioning mode. A feature of the method is to use two currents dynamic slowdown an asynchronous motor, running on a «autonomous voltage inverter - induction motor» in the frequency control. Program forming t…

THE OPTIMIZATION OF THE MODEL OF THE STRENGTHENED LAYER BY THE SURFACE STRENGTHENING

The parameters of the imitative model of multilayer conductive ferromagnetic media to achieve the optimal precision of modeling are determined. The experimental investigation of the distribution of physicomechanical and electromagnetic properties along the thickness of the sample have been carried out. The standard ep…

WELDED CONNECTION OF ROD PARTS WITH BODY PARTS BY ELECTRO PERCUSSIVE WELDING

The welded joints of the type of rod parts and body part are applied in machine-building and building. To get such joints for nonferrous metals and alloys by arc welding is extremely difficult. For these purposes especially for welding large sized parts it would be advisable to use electro percussive welding with magn…

SOCIAL EQUITY AND SOCIAL DISPARITY OF CONDITION MODERN RUSSIA

The article is devoted to the social problem disparity of division people in class, equity and social disparity. The devoted to the philosophical aspects of finding mean in the common in the modern Russia.

FLAW'S RECONSTRUCTION IN MULTI-LAYERS COMPOSITES

There are offered methods of faults reconstruction in stratified composites - stratifications (the interface flaws). Inverse geometrical problems of reconstruction of flaws are reduced to a solution of sequence of systems of the BIE obtained on the basis of reciprocity theorem of operations at established oscillations…

UNSTABLE OF THE CRYSTALLINE LATTICE BEFORE MARTENSITE TRANSFORMATION AND INFLUENCE OF THE EXTERNAL MAGNETIC FIELD IN THESE CONDITION

Will analysed thermodynamic conditions corresponding to unstable of crystalline lattice before martensite transformation, is considered phenomenas appearing in condition of unstable, is executed theoretical analysis of the possible structured conditions which detectable experimental, is considered phenomena superplast…

DETERMINATION OF COORDINATES OF COG'S SIDES OF THE GEARS WITH ELLIPTIC PROFILE

Results of theoretical definition of coordinates of a cog side having in normal cross-section the elliptic profile are presented. Equations connecting angular and linear dimensions of cogs in face and normal cross-sections are obtained. The offered technique is usable for a determination of coordinates of the profile…

STAND FOR TEST HYDRAULIC MACHINES WITH RECUPERATION OF THE ENERGY

The principle scheme of the stand is оffered for test the hydraulic machines with economy of the energy. Happens to its mathematical model and information about its preliminary analysis.

REVIEW OF INTERNATIONAL COMPARATIVE STUDIES OF SCHOOL STUDENT EDUCATIONAL ACHIEVEMENTS

This article offers a brief review of the current state of international comparative studies in the field of education. This direction is of a practical interest, as in Russia a number of international and national projects is currently underway, and a great interest is displayed to the foreign experience which is hel…

Natural fibre reinforced polymer composites – are short natural fibres really reinforcements or just fillers?

editorial

СHAOTIC COMMUTATING WITH THE DUNKL DIFFERENTIATION LINEAR OPERATORS ON THE SPACE OF ANALYTIC FUNCTIONS

We give representation of linea continuous operator, commutating with Dankle differentiation. These operators turn out to be chaotic and hypercyclic.

THE PECULIARITIES OF USING OF THE INNOVATION TECHNOLOGIES AT COLLEGES

In terms of crisis in the modern society the developing education lets us keep the intelligent mentality of young generation end develop it without any difficulties. It will assist to work out and drill modern the professional skills of young people The technology of making psychological conditions helps to develop ri…

MATHEMATICAL MODEL OF FORMATION OF NOISE OF VIBROSHOCK HARDENING OF LONGERONS OF HELICOPTERS

In article the mathematical model of formation of noise of the stand of vibroshock hardening of longerons of helicopters is resulted. Power methods speeds of fluctuations of separate subsystems and bearing system as a whole pay off. Dependences of vibrating capacity entered from a working environment in walls of conta…

AUTONOMY AND INTELLIGENCE OF MECHATRONICS OBJECTS

In clause the representation about man-mechatronics systems is entered; on the basis of the analysis of interaction of the man and machine of object the concepts of autonomy and level intelligence are formulated, the dependences for definition of the appropriate estimations are offered.