Materials Literature
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Polyetheretherketone (PEEK) composites have been extensively studied because of the excellent tribological behavior among plastics. However, laboratory specimens and tests are generally discussed, whereas application studies on industrial components are infrequent. In this paper, an injection molded bush made of tribo…
Compass is the popular instrument used in navigation. In the past, compasses were used to determine the coordinate of ships on the sea and position of people in the deep forests. Nowaday with the development of technology, electronic compasses contribute the excellent solutions in navigation, especially in navigation…
The present considered work modification of algorithm Alekseev for reception of the approached decision of a minimax problem of the theory of schedules is considered to system with selectivity of computing units. Keywords: the theory of schedules, a problem of planning, list of algorithm Alekseev.
The research provides a new data about the properties of cultivated environment for developing a power-saving operating elements for grain processing of a farming animal's forage. It received a new quantitative estimations of changing the basic rheological constants of damp grain in processes of rolling, determining t…
Using the method of electroresistance obtains data about course martensite transformations in steel under action of the magnetic field, formations specifying an opportunity stress-assisted martensite in temperature interval МS-МF in which superplasticity is shown. 208 Вестник ДГТУ, 2007. Т.7. №4(35)This opportunity is…
The question of optimization in deep drilling under the adaptive control system with restriction to torque value in drill is considered.
The problem of appearing defects in the form of crack formation on some areas of forgings can be explained by considerable non-uniformity deformation occurred in these areas. To optimize solving the problem in we suggest the method of defining these possible destructive areas.
In this research a method of the hydrodynamic calculation of the composite conic bearing is worked out on basis of the non-stationary equations of Navier-Stokes for the case of the «thin layer» and the Darsy equation with the use of the method of the constructional superposition. This research presents an ap-193 Разде…
A general approach of a mathematical model building of function a cleaning unit of grain with different structural schemes is given, a rational parameters and functional indexes are synthesis.
Conditions of motion stability loss is considering relative to mechanical system, interacting with media, forming in tribocoupling. Conditions of forming and role of dissipative, gyroscopic, potential and circular forces, which formed naturally in tribocoupling and changed in evolution transformation, are shown.
The machinability of a 30 wt% glass fiber reinforced polyamide (PA) was investigated by means of drilling tests. A disk was cut from an extruded rod and drilled on the flat surface: thrust was acquired during drilling at different drilling speed, feed rate and drill diameter. Differential scanning calorimetry (DSC) an…
The present research investigates the morphology, the mechanical, and the viscoelastic properties of rubbery epoxy/clay nanocomposites synthesized by in situ polymerisation of a prepolymer diglycidyl ether of bisphenol-A crosslinked with an aliphatic diamine based on a polyoxypropylene backbone. The inorganic phase wa…
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Given clause is devoted to a statement of algorithm of restoration of a periodic component of a signal in systems with an additive handicap of peak character at absence of aprioristic data on frequency of a restored signal.
It is offered approximate approach to time-suboptimal control for smooth stationary systems with phase constraints are considered. This approach associated with the feedback realization of time-suboptimal control nonlinear systems. The efficiency of the method allows synthesize suboptimal control law by optimal contro…
Results of experimental researches about influence of structure of trumpet steel 20 on characteristics of resistance to destruction are resulted. It is shown, that with the purpose of achievement of the greatest possible characteristics of resistance it is necessary for destruction to determine dependence of these cha…
The casual processes of the sale are considered as casual Poisson flow of the all-stock deals, sizes which also are a random quantity. It is shown that if the known distribution of probability of the sizes of the deals and density of the flow of the buyers, that possible calculate distribution of probability of the si…
There are given the research results conformably to the working accuracy with the help of combined carbide-tipped with heightened thermal conductivity lathe tools. The thermal broadening reduction of the newly-designed combined lathe tools is determined.
In the given work the basic attention is given a problem of construction of control in critical area where it is impossible to define control just as in other non critical areas. As a whole in work the interesting theoretical result which allows to offer new type of regulators for nonlinear objects of control is recei…
Problem of computer model development of Sudan and Guruswami's list decoders for generalized Reed-Solomon codes and concatenated codes is solved. Strict algorithm of list decoding of concatenated codes is given. The block diagram and program realization of decoder are constructed.