bluuebunny/crossref_metadata_2025 huggingface dataset:
3D-kinetic characteristics of slow fatigue crack growth in the aluminum alloy D16T
Authors: Kol’tsoun Yu. I. , Molyavko D. P. , Ignatovskiy A. D. , Khibnik T. A.
Published: May 2017

It is presented the technique based on macro structural analysis of a typical fatigue fracture of a cylindrical specimen of alloy D16T with an annular notch in bending of constructing the diagram of stress intensity coefficient defined the period growth of fatigue crack. Analytical calculation of the change in the exponent m in Peris formula for calculating the speed of fatigue crack growth with respect to depth a in a system with consideration of the increase in the number of cycles N of high-cycle fatigue has be established using experimental data of fatigue fractures of the aluminum alloy D16T. This made it possible to draw the kinematic diagram of a slow fatigue crack growth of D16T in a 3-dimensional coordinate system. Analyzed and numerically determine volumes are formed with the space curve the kinetic diagram of a slow fatigue crack growth. Installed a new kinetic characteristic of fatigue crack growth; i.e. the amount of work of the stress intensity coefficient used to connect parameters of low-cycle fatigue and high-cycle fatigue.
Results of hot tests of an oxygen preburner of a liquid-propellant engine 11D58MF
Authors: Barsukov O. A. , Strizhenko P. P.
Published: May 2017

In this article results of LRE 11D58MF oxygen preburner development are considered. Preburner consist of two zones. In the first zone fuel is burned, in the second zone combustion products are mixed with the rest of oxygen. There were 39 hot test on five preburners performed. Tests were conducted with variable chamber pressure, propellant mixture and initial temperature of gas oxygen. Evaluation of temperature field distribution and uniformity in outer section was performed. Mean temperature of combustion products on the exit section of preburner, obtained from test results, agreed well with theoretical calculations. Operational stability of preburner with various input parameters is confirmed. Design of injection elements and fuel input chamber were improved on order to assure reliability of preburner. Ignition and stop sequence instructions were formulated. Theres need to test three more preburners to complete individual development test series.
Estimation of mass-dimensional characteristics of a complex propulsion unit of earth remote sensing spacecraft
Authors: Kurenkov V. I. , Kucherov A. S. , Yakishik A. A.
Published: May 2017

An estimation method for weight and size characteristics of complex propulsion unit (CPS) of the Earth remote observation spacecraft determination based on calculations of required characteristic velocity needed to carry out various kinds of maneuvering is proposed. Program complex for automated posing and solving of design problems by choosing the design characteristics of CPS is developed based on a problem-oriented programming and implementing the exact approximation concept. Within the concept, optimization of CPS basic design parameters is carried out in implicit form, without setting the mathematical programming problem, which requires formulation of objective functions and limitations. Software package developed in the programming language Java is described. Use of the package is illustrated by determination of CPS parameters needed to provide given characteristic velocity for the spacecraft with given mass. In order to perform quick comparative analysis of alternative design versions of CPS, the package provides import of calculated design parameters into 3D design system wherein original parameterized CPS model may be preliminarily constructed.
Development of a technique of molding small complex parts of gas turbine engines from high-temperature alloys using additive technologies
Authors: Smelov V. G. , Balyakin A. V. , Agapovichev A. V. , Vdovin R. A.
Published: May 2017

Rapid prototyping technologies provide a unique opportunity to receive cost-effective solutions for theproduction of parts by investment casting. Research and development of rapid prototyping technologies allowedto move to a next level of optimization and the introduction of new processes in various areas of industry. At thestage of pilot production, which is characterized by frequent changes in design, the problem of the rapidproduction of cast components becomes crucial. This is mainly due to the complexity and the complexity ofmanufacturing foundry equipment. In turn, the research and development of rapid prototyping technologies haveallowed a new level of optimization and the introduction of new technologies in the investment casting. The aimof this work is to identify opportunities and evaluate accuracy of the size of the casting during investment castingusing rapid prototyping technology. The work was conducted with the use of cross-cutting design in CAM/CAD/CAE systems. The study size and precision parameters of the casting was conducted in coordinatemeasuring machine. The work has been verified the adequacy of the virtual simulation of the process of forminga casting in the casting simulation ProCAST, in comparison with those obtained castings. The study showed thatthe use of rapid prototyping technologies with investment casting can significantly reduce the time for makingcastings, reduce production costs and improve the accuracy of the size of the casting.
Analysis of the results of thermal cycic tests using TC-maps and problems of investigating thermal fatigue of materials
Authors: Tikhomirova E. A. , Sidokhin E. F.
Published: May 2017

We present a method for the analysis of the progress of the deformation within a cycle by constructing thediagram TC-maps, where presented dependences of the temperature free thermal deformation elastic deformation,corresponding to the flow limit of the material. The diagram shows the magnitude of the plastic deformationattained at the maximal temperature (Tmax) and its changes in the cycles. The diagram allows permits oneto choose the temperature mode required to obtain the desired deformation parameters in a test. An applicationof the diagram is presented in the case study analyzing the method and results of thermocyclic tests conducted onthe high-heat resistant alloy used for the construction of the blades in the VNKNA-1V turbines. It has been concludedthat under all possible modes the material is subject to plastic deformation within a cycle. Its presencedoes not allow one to conclude the dependence of the lifetime from the magnitude of the maximal stress registeredwithin a cycle.
Results of experimental studies of parameters of low-thrust rocket engines operating on gaseous oxygen-hydrogen fuel
Authors: Ageenko Y. I. , Lapshin E. A. , Morozov I. I. , Pegin I. V. , Ryzhkov V. V.
Published: May 2017

The article presents the results of an experimental study of the thermal parameters and with-standing experimental samples rocket engines gaseous oxygen with thrust 25 N and 100 N. In experimental models rocket engines thrust 25 N and 100 N ignition fuel components arranged in the discharge chamber spark plugs. Scheme carburetion of engines characterized by the interaction of coaxial swirling flows of fuel and oxidant is carried out in two stages. At the same time, realized highly turbulent flow, contributing to the efficient mixing of fuel and oxidizer in a limited volume of the combustion chamber. Cooling chamber traction motor 25 H organized using a gas curtain of fuel from the mixing head and the application of high temperature structural material boronsiliconized graphite, which is made of a combustion chamber and a nozzle. In rocket engines thrust 100N further organized subsonic curtain fuel located at the end of the cylindrical portion of the combustion chamber, but at the same time as the construction material used stainless steel type 12X18H10T. Experimental studies have been tested two structural variants of organization of the ignition process, evaluated the effectiveness of the scheme of mixing hydrogen and oxygen gases. In this case, the following values of specific impulse engines: for rocket engines thrust 25H with the geometric expansion ratio of the nozzle Fа = 45 - 3846 m/s; for rocket engines thrust 100N with Fа = 45 and Fа = 250 respectively 3855 m/s and 4100 m/s. From the point of view of the thermal state in the study design rocket engines propellants, promising is the use of new construction materials, such as ceramics, graphite-based materials with the development of the technology for their production, as well as interfacing to the mixing head, made, usually made of stainless steel. In support of the above, in the use of the camera rocket engines thrust of 25N boron-siliconized graphite allowed during the test the engine for 100 seconds to get the maximum temperature of the outer surface of the chamber at ~ 1045 C.
Investigation of the vibration behavior of a gas turbine engine in icing conditions
Authors: Danilkin S. Yu. , Teleshev V. A.
Published: May 2017

With respect to aeronautical engineering it is focused on the problems of the dynamic strength of parts and units of aircraft engines, namely the resistance of the material under the action of various oscillatory processes (vibration) arising from the operation of such engines. An important aspect of this problem is to ensure the safety of flight in atmospheric icing conditions. Relevance of study is determined, above all, the lack of study of the processes of icing. The paper summarizes the results of processing the experimental data obtained in a test of gas turbine engines in icing conditions at a specialized ground test rig. The stages of the process with regard to icing vibration condition of the engine. In the course of experiments on icing were found in the spectrum of the vibration diagnostic signs of the blades self-oscillations. One of the probable causes of such hazardous processes may be throttling the fan due to ice build-up on the blades straightener or on input parts of the fan. However, for a more detailed description of these phenomena occurring in icing conditions, additional studies, experiments, calculations. This article describes the features of the study of vibrating processes in the engine in such trials. It is discussed the directions for further research on this issue.
Numerical simulation of tonal noise of a bypass engine fan stage
Authors: Pyatunin K. R. , Arharova N. V. , Remizov A. E.
Published: May 2017

With the tightening of the norms of ICAO aircraft noise on the ground is necessary to pay more attention to the acoustic design of power plants. For modern civil aircraft engines with high bypass fan is characterized by a dominant influence on the overall noise level. Due to the fact that the design of the fan and LPC largely determines the design of the engine must still at the project stage to be able to assess the acoustic characteristics of this module. This provides an opportunity to use methods of computational aeroacoustics. The results of numerical simulation of fan tonal noise using commercial code were presented. The results of calculations include the sound pressure level and sound radiation directivity for approach. The simulation was carried out for full nonaxisymmetric case. The possibility of using this method for evaluation of acoustic characteristics aircraft engines fan are analyzed.
Deformation and fracture strength of single-crystal superalloys under static and cyclic loading
Authors: Semenov A. S. , Getsov L. B. , Semenov S. G. , Grishchenko A. I.
Published: May 2017

The peculiarities of short-term resistance to tension/compression, creep, long-term strength and thermal fatigue of single-crystal superalloys for different crystallographic orientations and temperatures are considered. The failure criteria are proposed using a unified measures equivalent stress (strain) for the cubic system, allowing to compute adequate strength and durability of single crystal materials under complex multi-axial inhomogeneous stress state, which is characteristic for gas turbine engine blades during the operation.
Significance and directions of development of rotary piston area of research
Authors: Okorochkov V. V. , Okorochkova V. M. , Shafranov V. V.
Published: May 2017

The development of small and unmanned aircraft in Russia is hampered by the lack of production of domestic aircraft engines in the power range up to 200 h.p. The main requirement for the aircraft engine is minimal ratio of mass and overall dimensions to output. In a greater degree that is matched by the engines of rotor piston layout. The intensive work on rotor piston engines is carried out abroad by companies of many countries: Britain (UAV), USA (Freedom Motors), Austria (Austro engine) etc. In Russia, at SKBM the works on rotor piston engines were conducted for outboard motor application in cooperation with Rotor Piston Engines Design Bureau of AVTOVAZ. For the satisfaction of needs for small and unmanned aircraft a project of creation of rotor piston engines in the power range of 8-200 h.p. was developed.
Examination of the theoretical possibility of creating a vernier electrorocket engine
Authors: Baigaliev B. E. , Chernoglazova A. V. , Tumakov E. A. , Temnikova S. V.
Published: May 2017

The report examines the possibility of creating a vernier electric rocket engine. All engines feature hightemperature combustion products from the engine nozzle that will be vented to the outside. The proposed motor will operate as follows: the working fluid (liquid) is supply through the porous insert into the combustion chamber via a gear pump. In fluid flow through porous insert, the liquid takes the temperature of the insert and may exceed it under certain conditions. These conditions are low porosity inserts (less than 0.05). The process will proceed in two stages. The first stage liquid is converted to steam, which is then heated to a temperature of the porous insert, and may exceed it as a porous insert can be used the porous materials made of a metal having a melting point from the melting point to the melting point of copper tungsten. In the second stage, the energy obtained in the first step is liberate in the nozzle apparatus for producing thrust. The energy input to the transformation from liquid to vapor and overheating by setting HDTV. Efficiency of these plants is 95%. Thus, the combustion chamber working fluid is at a temperature necessary to achieve the desired parameters of the rocket engine.
Increasing wear resistance of gas turbine engine blades on the basis of improving the process of thermoplastic hardening
Authors: Karpov A. V.
Published: May 2017

The article describes a promising method for hardening treatment that improves the fatigue resistance of the surface layer of the blades of gas turbine engines (GTE), such as the thermoplastic hardening (TPH). It is shown the diagrams of a process for setting a hardening treatment. It is chosen the most rational modes of gas turbine engine blades hardening treatment plants for consideration for TPH. It is presented the principle of operation of installations for TPH and shown their basic design features. It is considered some types of equipment for the study of residual stresses and fatigue resistance. It is obtained the results of experimental studies of residual stresses and fatigue resistance for the consideration of plants for TPH. The results of the main conclusions are made: the greatest impact on the formation of residual stresses at thermoplastic hardening has the intensity of cooling, with an increase in which the value of residual stress increases; the optimum heating temperature is TPH 700 + 50 C and the pressure at the facility coolant cooling system with a controlled (1 - 1.5) MPa, the facility with the cooling system unregulated 0.54 - 0.6 MPa; hardening apparatus with controlled cooling system, as compared with hardening apparatus with irregular cooling system that increases the endurance limit at 3.5-5%, which prolongs the service life of the at 700-1000 hours.
Modeling of intrachamber processes in an oxygen-hydrogen thruster
Authors: Vaulin S. D. , Salich V. L.
Published: May 2017

The result of this work was the creation of the chamber thruster on the perspective oxygen-hydrogen fuel. In the process of designing the used ANSYS CFX system, which was implemented mathematical model of homogeneous multicomponent working body with the mixing and combustion. The calculations were performed on a supercomputer "Tornado" in South Ural State University. The simulation results of the first version of the chamber revealed a non-functional due to the high temperatures in the area of structural elements (external cooling was not provided), and therefore it was decided not to make this chamber. In the process of further computational studies chamber design being modified as long as it was not possible to achieve high combustion efficiency with the presence of structural elements near the zones with temperatures not exceeding the maximum allowed operating temperature of the material. Chamber manufacturer has passed fire tests, which confirmed its performance during long inclusions and showed acceptable power characteristics. It was also a satisfactory agreement between the experimental data with simulation results. Thus, the use of numerical modeling would eliminate the traditional to create new chambers long and costly phase of the comparative tests.
Research of the validity of forecasting low cycle durability of gas turbine engine parts based on Manson’s equation
Authors: Porter А. M. , Bukatyi S. A. , Leshin D. P.
Published: May 2017

The article presents the prediction of low-cycle durability of gas turbine discs and test samples by the method of universal tilt on the basis of the Manson equation and its various modifications. Manson equation obtained by testing of standard specimens in stretching-compression, i.e. an uniaxial stress state and the symmetric cycle of loading. Under complex stress-strain state in the modification of the equations embeded the mean stress of the cycle, but clear guidance for determining it are missing. In this paper we proposed different ways to imagine the average stress. On the basis of verification of various modifications were adopted, the results of tests of standard specimens with circular cross-sections, samples of the lock "swallow's tail" cut from the disks of the compressor, as well as full-scale drive of new and used. The test was carried out from zero cycle of loading close to the real operating conditions of main parts of the gas turbine engine. By comparison of calculation results with the experimental data revealed the most effective ways to refine the Manson equations. It was found a significant effect on low cycle durability of not only the magnitude of deformation of the parts, but the type of stress-strain state. Therefore, the most effective was the using of the stress intensities. It was also established that the refinement equation, introduced by Manson and Muralidharan applicable only for stress states that are close to flat.
Calculation of exciting aerodynamic load on a gas turbine engine compressor blade induced by the effect of a non-uniform gas flow
Authors: Ermakov A. I. , Shklovets A. O. , Fedorchenko D. G.
Published: May 2017

Work is devoted to the creation of a design procedure of the exciting loads occurring on the impeller blades of GTE in situations of uneven circumferential gas load. The presence in the path of the engine bluff bodies, such racks engine mounts, causing substantial circumferential flow unevenness. Consequently, in blades having dangerous resonant vibrations that can lead to product failure. Determination of amplitude of the excited harmonics in the design phase will assess the severity of forced oscillations of the blades. The technique of determining the excitation of harmonics in the flow allows the calculation of the amplitude, to determine the impact of structural changes in the running of the engine on them. The finite element model consists of the inlet guide vane, rotor blades and bearing racks. Gas dynamic load is determined in units of rotor blades, but a small number of blades, eg for fan impellers, the accuracy of the excitation amplitudes of harmonics may be insufficient. Using the capabilities of Ansys CFX, gas-dynamic load is defined in additional areas path between the rotor blades. In work changing amplitudes of harmonics based on the number of measurement points of load.
Experience in the development of 11Д58MФ liquid rocket engines
Authors: Smolentsev A. A.
Published: May 2017

The article presents an analysis of the design work carried out in the design of liquid rocket engine (LRE) 11Д58MФ developed by JSC "RSC" Energy "for the upper stage (RB) ДМ. The developed liquid fuel rocket engine has a number of features that require innovative approaches to its design. The structure of the engine including experienced combustion chamber, the control system with functions for diagnostics and emergency protection, power supply of oxidizer and fuel tank with elements of devices that provide a guaranteed intake of propellants during his multiple inclusions, blocks thrusters operating on gaseous oxygen and providing impetus prelaunch booster and orientation in flight.The cooling chamber is performed without the use of liquid oxygen internal cooling is performed with a nozzle chamber with uncooled high expansion rationozzle. Workflow efficiency in the combustion chamber is provided by a slit mixing head, which uses the circuit components of mixed fuel: jet fuel into razing oxidant stream.Basic design and engineering solutions for combustion chamber: the use of a slit mixer-term head of the engine, performing geometry of cooling path with variable height, thickness and angle of the ribs to the axis of the chamber, the technology of manufacturing, assembly and soldering the mixing head and combustion chamber have been experimental testing. The LRE-linen design process was defined the composition ofpneumohydroautomaticequipment, small draft engines block, autonomous system universal and can be used in the development of similar engines.
11D58MF combined propulsion unit operating on oxygen-hydrogen fuel for an average-sized booster
Authors: Lupyak D. S. , Smolentsev A. A. , Sokolov B. A. , Tumanin E. N. , Tupitsin N. N.
Published: May 2017

This paper describes the expediency of creation a combined propulsion unit with oxygen-hydrocarbon fuel for advanced upper stage of the middle class rockets based on the multifunctional liquid-propellant rocket engine 11D58MF. The appearance of the upper stage with 11D58MF engine, comparative analysis of the developing and exploitation upper stages are presented. The peculiarities of 11D58MF engine notes. At present there is a number of objective reasons and circumstances in which it is necessary to carry out works on the creation of propulsion with oxygen-hydrocarbon fuel in the domestic space industry. This propulsion can be used as in creation of advanced upper stage for the space launch complex with family of the middle class launch vehicles "Souz" in launch site "Vostochniy" as in creation of upper stages for the light and ultra light class launch vehi cles. At that upper stage with new propulsion will be able to compete with the blocks that are being in developing or exploitation at present.
Assessing the influence of surface hardening on the endurance limit of specimens made of steel 40X using residual stresses of reference specimen
Authors: Sazanov V. P. , Vakulyuk V. S. , Shadrin V. K. , Surgutanov N. A. , Shlyapnikov P. A.
Published: May 2017

The possibility of the employment of reference specimens hardened simultaneously with the parts has been examined for the hydroblasting influence estimation on the parts with concentrators endurance limit on the example of hollow cylindrical parts made of steel 40 with circular cuts of semicircular profile with the radius 0,3 mm. The investigation has shown that the difference between residual stresses values found by calculating and experimental methods doesnt exceed 8% in smooth specimens, in specimens with cuts 6%. Under the hydroblasting influence on the endurance limit estimation in conditions of bending in the case of symmetric cycle for hollow cylindrical specimens made of steel 40Х with cut of radius 0,3 mm its been established that the employment of residual stresses distribution calculated by the initial deformations of reference specimen let predict the specimens endurance limit increase under stress concentration conditions to an approximation of 8%. It has been shown that its reasonable to use the average integral residual stresses criterion calculated through the dangerous section surface layer thickness equal the non-propagating fatigue crack critical depth for the prediction of the endurance limit increase of hardened by hydroblasting specimens made of steel 40 with stress concentrators.
Influence of argon, propane and ethane viscous dissipation on the thermal state of a porous plate
Authors: Baygaliev B. E. , Tumakov A. G. , Tumakov E. A. , Ibragimov A. I.
Published: May 2017

The report provides information of using a differential equation of the temperature field of the porous plate, derived taking into account the heating of the skeleton due to the forces of friction when pushing the coolant through the porous plate. Temperature field of the porous plate is determined for different values of porosity and different types of coolant under the boundary conditions of the third kind. Calculation of the temperature field of the porous plate, taking into account the dissipation implemented through programs compiled in Matlab. When the porosity of the insert 0,20 viscous dissipation effect is present, but negligible. Increasing porosity does not lead to significantly different calculation of the temperature condition of the porous insert with and without consideration of viscous dissipation. So keeping the viscous dissipation per thermal state of the porous insert with a porosity of more than 0.2 is not washed away. It was found that the porosity of the matrix is observed increase its temperature. Results showed that when the water flow to the final boundary of the matrix, we can observe both an increase and a decrease in temperature, which indicates the importance of taking account of viscous dissipation and proper selection of both costs and porosities, and the kind of coolant.
Creation of a data retrieval system for choosing the optimal cutting tool in manufacturing aircraft engine parts
Authors: Shulepov A. P. , Meshcheryakov A. V. , Ramzaeva E. A.
Published: May 2017

The article presents the algorithm of a tool selection for edge machining cutting based on a number of principle criteries on selection of a cutting blade shape, tool-mounting system, tool material. The work gives a description of interface and database structure of information storage and retrieval system dealing with the selection of cutting tool and cutting mode in manufacturing of aircraft engine parts. There are a number of basic criterions that have an impact on the selection of the cutting plate, fastening systems of tool and a cutting material such as the type of the process (roughing, light roughing, wiping); the dimensional accuracy; the power burden of the technological system; the rigidity of the technological system; the size and the type of the material blank; the accuracy of the material blank; surface layer condition of the material blank (peel, scale pits, etc); the amount of the dimensional allowance properties of the work material; the diameter of the bore hole under conditions of the internal work; the direction of feed motion at each cutting pass; the work surface profile; technological features of the equipment (the efficiency of the spindle, the rotating frequency the maximum feed, the maximum diameter of the material blank, the maximum length of the material blank, the type and the size of the tool holder, availability of the metal-cutting compound); the maximum value of the depth-of-cut for each operation; surface quality requirements of the work part; the machining conditions (continuous interrupted and impact cut, constant and variable depth-of-cut); required productivity of the tool; required tool life.
Specifying perforated skin parameters in manufacturing honeycomb panels of soundproof structures
Authors: Molod M. V.
Published: May 2017

The article describes the geometric characteristics and features of technology of constructive elements of welded, glued and brazed honeycomb panels used in sound-absorbing constructions channels air intakes and engine casings. Discusses the advantages and disadvantages of various methods for obtaining the perforation drilling electric discharge method: a method of punching sheet at press. Analyse the advantages and disadvantages of each method. In the technique and the dependences for determination of harvesting and the perforation zone boundaries, as well as forming process diagram of perforated paneling. The managing foiling program is developed to meet the geometry, kinematics of the punch press, mechanical characteristics and mathematical model of process of formation. This technique allows you to significantly reduce the number of signs of rejection of the process. One of the most important problems of forming plating method of covering is the uneven distribution of deformations on the surface of the workpiece. To solve this problem, the proposed method of reducing inequality deformation along the contour of the workpiece from the special inserts installed in the press.
Laser measurement systems for structural elements’ spacing check
Authors: Mordasov V. I. , Sazonnikova N. A. , Nonin A. S.
Published: May 2017

In order to improve monitoring of the provisions of parts during assembly, final operations and subsequent operation the laser measuring system is designed to control the angular position of the structure. In relation to the task, it is necessary to realize a small-sized measuring rotary system providing high accuracy (error of not more than 1.5...2 angular seconds) when significant working distance between the test object and the autocollimator (up to 20 meters) and a relatively wide measurement range (10...12 angular. minutes). The method of "straight angled serifs" was constructed to solve this problem. Measuring channel implements a triangulation method. In accordance with the method of each video camera measures the viewing angles of the laser diode located at the checkpoint. Control surface areas has two phases: the control position of seats held without technological loads and after loading. In the result of the revealed analysis the following primary errors were established to determine the precision measurement of linear and angular coordinates of the test object: the measurement error of the coordinates of the center of the image of the measuring mark on the CCD matrix measuring opto-electronic transducer, due to noise and resolution the receiving area and the measurement uncertainty is determined by the deviation of the focal length of the lens from the nominal value.
Formation of spread in resonance stresses in bladed disks with non-identical blades and loose vibration conectedness
Authors: Ermakov A. I. , Urlapkin A. V. , Fedorchenko D. G.
Published: May 2017

The paper discusses the forced vibrations of mistunedbladed disks and loose vibration connectedness on the example of the model disk. It is shown that such wheels in separate frequency bands are losing the main features characteristic of systems with a small deviation from rotational symmetry. This leads to a qualitative change in the nature of their oscillations about the exciting harmonics. Otherwise becomes a mechanism for the formation of these scatter resonant stresses. It is found that the resulting vibrations in the bladed disks with a mistuning and loose vibration connectedness are a superposition of vibrations in several successively excited forms one family, the number of which may be up to a number of limited order of symmetry of the system occurring in the frequency range, depending on the accuracy of the blades.
Development of the construction of a gas turbine engine vane with built-in vortex tubes
Authors: Veretennikov S. V. , Barinov S. N.
Published: May 2017

This paper presents the results of numerical and experimental studies of heat transfer of swirling flows in channels and cyclonic vortex tubes using as a working medium of air and superheated steam. The research results of the calculation depends on the number of elements of the computational domain and on the time step. The experimental data were compared non-adiabatic of the vortex tube in air and water vapor. Numerical study of conjugate heat transfer vane turbine with two integrated eddy energy separators with superheated steam as a coolant. Given flow characteristic of the blade, the dependence of the cooling efficiency of the coolant flow and temperature distribution obtained in the material of the blade.
Overwintering of Aenasius arizonensis (Girault) (=Aenasius bambawalei Hayat) (Hymenoptera:Encyrtidae) under Screen House/Semi-Natural Conditions
Authors: Rathee Mandeep , Ram Pala
Published: May 2017

Overwintering studies were carried out by placing newly emerged adults of the parasitoid, Aenasius arizonensis (Girault) (=Aenasius bambawalei Hayat) (Hymenoptera: Encyrtidae) and one day old mummies of Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae) (i.e. parasitoid in pupal stage) during winter season under screen house conditions in 2012- 13. Maximum mean pupal period of male and female parasitoids was 86.47 and 92.67 days, respectively, when mummies were exposed on 5th December followed by 73.69 and 82.83 days, respectively. When exposed on 20th December the emergence of parasitoid adults from the overwintering mummies seemed to be well synchronized with ambient weather conditions. This implies that there is no diapause in A. arizonensis. There was no adult emergence until 10th standard week due to prevailing low temperature conditions during December and January with average maximum and minimum temperatures of 20.9, 6.4°C and 17.1, 4.1°C, respectively. Emergence of parasitoid adults from overwintering mummies of different exposure dates viz., December 05 and December 20, 2012; January 04, January 19, February 03 and February 18, 2013 started from 11th standard week (first week of February), reached maximum in 14th standard week (first week of March) and continued until 16th standard week (third week of March). Maximum temperature ranged between 20.3 and 29.6°C and minimum between 6.6 and 12.5°C during the period of adult emergence. Adult parasitoids successfully overwintered when provided with honey. Males survived for 52-84 days (69.33 days) and females survived for 69-103 days (83.40 days) during winter season in absence of host, when exposed on 5th December, 2012. Our results demonstrate that the parasitoid is able to successfully overwinter as pupa and adult via combination of slow development and increased adult longevity. This information seems to be useful in enhancing population of this parasitoid in spring when A. arizonensis can suppress solenopsis mealybug on cotton crop.
Effect of Native and Non-native Hosts on the Biology of Acerophagus papayae Noyes and Schauff, the Introduced Parasitoid of Paracoccus marginatus Williams and Granara De Willink
Authors: Nisha R. , Kennedy J. S.
Published: May 2017

The bioecology study of any parasitoid using alternative hosts imposes divergent selection pressures on parasitoid populations. In this study, we investigated the bioecology potential of parasitoid Acerophagus papayae Noyes and Schauff on papaya mealybug Paracoccus marginatus Williams and Granara De Willink from different plant hosts. The parameters studied were adult longevity (survival of progeny), fecundity and productivity of female mealybugs and sex ratio of progenies of P. marginatus. The results showed significant differences in bioecology of parasitoid on their natal host (P. marginatus from papaya) compared with the non-natal hosts (P. marginatus from non papaya hosts). It is also compared with honey concentration solution and potato sprouts. The parasitoid is well adapted to the natal host that is papaya compared to others host. However, parasitoids showed a similar high fitness on both natal and non natal hosts. This results could be used to increase the effectiveness of biological control programme on different views.
First Report of Larval Parasitism of Ethmia nigroapicella Saalmüller (lepidoptera: Gelechioidea: Ethmiidae) by Therophilus festivus (Muesebeck) (Braconidae: Agathidinae) in India
Authors: Gupta Ankita , Sanjeev Umeshkumar
Published: May 2017

Larval parasitism of Ethmia nigroapicella Saalmüller (Lepidoptera: Gelechioidea: Ethmiidae) by Therophilus festivus (Muesebeck) is reported from Karnataka, India. This is the first illustrated record of solitary parasitism by T. festivus on its host E. nigroapicella.
Biocontrol of Rhizoctonia solani Root Rot of Chilli by Bacillus subtilis formulations under Pot Conditions
Authors: Narasimhan Ashwini , Shivakumar Srividya
Published: May 2017

The chilli crop suffers massive yield loss due to root rot caused by Rhizoctonia solani. An increase of 10 × 105 root colonizing units/cm was obtained as a result of Bacillus subtilis in vitro root colonisation assay post germination. Shelf life studies of the formulations revealed stable population level of the biocontrol agent upto 180th day (30°C - 1.6 × 108; 4°C - 1.9 × 108) in talc and upto 150th day in lignite (30°C - 1.5 × 108; 4°C - 1.3 × 108). Soil, seed, foliar spray and dip treatment methods of B. subtilis and chlorothalonil brought about a considerable enhancement of all biometric parameters and reduced disease incidence compared to the untreated control. In comparison to the untreated control (50 g and 21 g fresh and dry weight, respectively), highest plant fresh weight (76.84 g) and dry weight (34.17 g) was achieved by the Seed application method. Comparison of plant height revealed maximum values 70 cm (soil application) and 77 cm (dip treatment) with B. subtilis application which was analogous to chlorothalonil treatment (56.5 cm with soil application and 70.33 cm with dip treatment) which was considerably superior to the untreated control (58.2 cm with dip treatment and 61 cm with soil application, respectively). Root dip treatment showed considerable increase in root length with B. subtilis (33 cm) and chlorothalonil (28.5 cm) when compared to untreated control (15 cm). Growth promotion was better with Root dip application while disease control was achieved better with seed application. A 66% and 84% reduction in incitation of disease was noticed with soil and seed application methods, respectively.
É possível ensinar a genética para alunos cegos?
Authors: Faria Mauro Luiz Da Hora , Costa Janilda Pacheco da , Delou Cristina , Teixeira Gerlinde Agate Platais Brasil
Published: May 2017

O uso de modelos tridimensionais é uma estratégia que facilita ensinar temas considerados difíceis para muitos professores no ensino médio, mesmo para classes que não têm alunos com necessidades educacionais especiais. Tivemos como objetivo, portanto, desenvolver um modelo tátil que auxiliasse na compreensão da estrutura do DNA e de sua replicação. Para tanto, adaptamos os passos descritos por Miotto para a construção de modelos táteis. O resultado foi a construção da matriz e das estruturas básicas da molécula de DNA, em papelão coberto com diferentes texturas. As placas de acetato em alto relevo foram preparadas após a aprovação por um aluno cego, que informou que a escala e as texturas escolhidas possibilitaram a identificação da estrutura como um todo e de suas partes, que foram testadas e aprovadas por alunos cegos na sala de recursos de uma Escola Pública Estadual.Palavras-chave: Construtivismo. Linguagem da ciência e da sala de aula. Ensino de ciências. Educação especial. Genética.Teaching genetics to blind-students – is it possible?AbstractThe use of three-dimensional models is a strategy that facilitates teaching contents considered difficult for many high school teachers even in classes that do not have students with special educational needs. Our objective was to develop a tactile model that helps the understanding of the DNA structure and its replication. To achieve this, we adapted the steps proposed by Miotto for the production of tactile models. As a result, we constructed the matrix of the basic structures of the DNA molecule in cardboard covered with different textures. After approval by a blind student, who reported that the scale and textures chosen allowed identification of the structure as a whole and its parts, we prepared the high relief acetate plates. These were tested and approved by blind students in the “resource class” of a State Public School.Keywords: Constructivism. Science and classrooms language. Science education. Special education. Genetics.
El tranvía de Bogotá, 1882-1951
Authors: Correa Juan Santiago , Jimeno Santiago , Villamizar Marianela
Published: May 2017

Este artículo analiza la evolución del sistema de tranvías en Bogotá y el desarrollo empresarial que lo acompañó en el periodo 1882-1951, para entender la relación de la élite con este proyecto y de qué manera la aparición de nuevas tecnologías de transporte incidieron en el diseño de la ciudad y en la dinámica social y económica, así como su efecto en los sectores populares.
Elementary Proof of Strong Normalization for Atomic F
Authors: Ferreira Fernando , Ferreira Gilda
Published: May 2017

We give an elementary proof (in the sense that it is formalizable in Peano arithmetic) of the strong normalization of the atomic polymorphic calculus Fat (a predicative restriction of Girard’s system F).
Commutative Energetic Subsets of BCK-Algebras
Authors: Jun Young Bae , Roh Eun Hwan , Song Seok Zun
Published: May 2017

The notions of a C-energetic subset and (anti) permeable C-value in BCK-algebras are introduced, and related properties are investigated. Conditions for an element t in [0, 1] to be an (anti) permeable C-value are provided. Also conditions for a subset to be a C-energetic subset are discussed. We decompose BCK-algebra by a partition which consists of a C-energetic subset and a commutative ideal.
Axiomatization of a Basic Logic of Logical Bilattices
Authors: Takano Mitio
Published: May 2017

A sequential axiomatization is given for the 16-valued logic that has been proposed by Shramko-Wansing (J Philos Logic 34:121–153, 2005) as a candidate for the basic logic of logical bilattices.
Categorical Abstract Logic: Hidden Multi-Sorted Logics as Multi-Term π-Institutions
Authors: Voutsadakis George
Published: May 2017

Babenyshev and Martins proved that two hidden multi-sorted deductive systems are deductively equivalent if and only if there exists an isomorphism between their corresponding lattices of theories that commutes with substitutions. We show that the π-institutions corresponding to the hidden multi-sorted deductive systems studied by Babenyshev and Martins satisfy the multi-term condition of Gil-F´erez. This provides a proof of the result of Babenyshev and Martins by appealing to the general result of Gil-F´erez pertaining to arbitrary multi-term π-institutions. The approach places hidden multi-sorted deductive systems in a more general framework and bypasses the laborious reuse of well-known proof techniques from traditional abstract algebraic logic by using “off the shelf” tools.
Польско-русская жаргонная омонимия
Authors: Невзорова-Кмеч Елена
Published: May 2017

Настоящая статья посвящена освящению одной из важных и актуальных в настоящее время тем – межъязыковым омонимии близкородственных языков – польского и русского. Глубокое изучение лексических и фразеологических единиц польского и русского языков с эквивалентной формой и различной семантикой началось не так давно, поэтому есть лакунарные зоны в исследовании межъязыковой омонимии. Одной из них является систематическое описание межъязыковых соответствий омонимичного характера в области жаргона. Попытка освятить некоторые проблемы предпринимается в представляемой работе. Внимание сосредоточено на двух связанных друг с другом вопросах, а именно: какова специфика трак­товки терминов межъязыковая омонимия и межъязыковой омоним в случае их применения при описании жаргонного материала и как образуются жаргонные омонимы. Для решения этих вопросов был проанализирован жаргонный материал польского языка в сопоставлении с материалом русского языка с точки зрения существующих между ними семантических отношений. Особый упор делается на изучение этимологии межъязыковых сопоставлений омонимичного характера.
Nazwy części twarzy w językach słowiańskich
Authors: Rytter Grażyna
Published: May 2017

Szkic etymologiczny prezentuje 19 wyrazów, w większości o zasięgu ogólnosłowiańskim. Są one tematycznie związane z psł. *tvarь. Artykuł zawiera również uwagi o tradycji kulturowej Słowian, która prawemu oku przypisuje atrybut „szczęśliwe”, lewemu – „nieszczęśliwe”. Do najstarszych i najpowszechniejszych wierzeń zachowanych w folklorze słowiańskim należy przekonanie, że ludzkie oko ma moc rzucania uroku czy klątwy.
Z wyciągów archiwalnych województwa łódzkiego: o metrykach parafialnych drugiej połowy XIX i początku XX wieku
Authors: Iacovou Anna
Published: May 2017

Artykuł jest poświęcony opisowi dokumentów zawartych w księgach metrykalnych pochodzących z przełomu XIX/XX wieku z terenów województwa łódzkiego. Do analizowanych tekstów należą akty urodzenia (chrztu), akty ślubu i akty zgonu. Autorka przedstawia krótką historię kształtowania się tych dokumentów w Polsce od XVI wieku, analizuje ich zawartość, specyficzną budowę, oraz zwraca uwagę na ważniejsze zjawiska językowe. Ponadto w artykule zamieszczono przykłady aktów metrykalnych zarówno w języku polskim, jak i w rosyjskim z uwagi na fakt, iż pod zaborem rosyjskim dokumenty te pisane były po rosyjsku od 1868 roku.
О некоторых аспектах передачи фразеологизмов в русско-польском переводе
Authors: Jóźwiak Jolanta
Published: May 2017

В статье рассматриваются проблемы, с которыми сталкивается переводчик в процессе перевода фразеологических единиц. Анализируя примеры переводческих соответствий, автор пытается показать, каким образом стремление сохранить внутреннюю форму фразеологизма влияет на выбор соответствия. Для оценки и объяснения переводческих решений используются элементы когнитивного метода.
Словообразование русского студенческого жаргонa
Authors: Sosnowski Jan
Published: May 2017

Жаргон – это разновидность речи, используемая преимущественно в устном общении какой-то социальной группой, характеризующейся определённым положением в обществе, взаимными интересами или одинаковым возрастом её членов.В данной статье подвергается анализу словообразование имён существительных современного студенческого жаргона. Источником исследуемой лексики послужили словари русского молодёжного, в том числе и студенческого, жаргона, материалы студенческих форумов, а также лексические единицы, полученные от русских студентов в результате опроса.Самые популярные способы образования имён существительных студенческого жаргона – это морфологический способ (вместе с аббревиацией и усечением производящей основы), метафоризация и заимствование иноязычных слов. Важную функцию выполняет также использование фонетической мимикриии. Студенты играют словами, применяют каламбуры. Их языку свойственны шутливость и экспрессия.
Советская действительность сквозь призму aнекдота (лингвокультурологический аспект)
Authors: Wierzbiński Jarosław
Published: May 2017

В статье представлено на материале анекдота как вида текста описание советской действительности. Очерчивается тематическая разнородность ситуативных контекстов в анекдоте, а также прослеживается специфика лексического, грамматического и стилистического маркеров анекдота как характерных показателей эпохи. Используемые в разработке межкультурные параллели позволяют еще более оттенить и подчеркнуть специфику русской ментальности той поры.