Research of modes of electropulse processing for an intensification of processes of deformation of trumpet preparations from titanic alloys

The growing requirements to accuracy of manufacturing of details of flying devices including fromti-tanic alloys,results in substantial growth of labour input of their manufacturing.It speaks that titanic al-loys have rather low module of elasticity,high durability,resilient after removal of loading that results innecessity of performance of honing works after manufacturingfromthemdetails.Nowштамповочноеmanu-facture has progressive the equipment and new ways of punching of details …     

Conductivity of ion-replaced forms of clinoptilolite

Though recently researchers are paying great attention to the physics of zeolites,the theory of theseminerals conductivityis practically undeveloped.That is whythe paperis ai med at studyingtheinfluence ofthe exchange cation on the clinoptilolite conductivity.The clinoptilolite is a widely spread natural zeolite,havingindustrial value.In this connection samples were received onthe basis of monofractions of this mineral processed by1Mchlorides solutions of alkaline metals(Lithium,Sodiumand Po…     

Optimization of industrial structure： crux of the transition of mining cities

The rise and development of mining cities in our country take an extremely special status and play an important role in the national economy and social development. However, there are many problems in mining cities and their industrial structure. To realize the transition of mining cities, we must optimize the industrial structure. According to the theory of the optimization of industrial structure, the strategy is to organize regional enterprise groups, develop cluster economy, continuing industry and circular economy, and promote the rationalization of cities and regional industrial structure.     

Influence of inhomogeneity of grain-boundary region of nanocristalline materials on elastic properties

The data on nanocrystalline materials Young s modulus measurement showit to haveless value compa-ring with this of polycrystalline materials . Effective bulk Young s modulus decreases as grain size decrea-ses . One of possible and,eventually , mainfactors for this decreaseis the presence of grain-boundary phasewhere Young s modulusis different fromone for grainitself .Asit is shownin[1],the application of Reuss ,Voigt and three-di mensional models for the calculation of nanocrystalline mater…     

Assurance of operate reliability of rolling stock

The safety of movement of rolling stock is mainly related to operate reliability of conjugated parts ofrunning carriages which are characterized by their ability of no failure operation in complex conditions ofservice and have a sufficient high strength and wear resistance . Variation of the characteristics of compo-nents because of irregular wear has an effect on a decrease of reliability function pairs operation,since theinteraction of many main components of running carriages is realized thr…     

Improvement of mechanical properties of steel sheet

Best properties are peculiar to marquenched structural steels of the following alloying system:Si+Mn+Cr,Si+Mn+Cr+Ni,Cr+Ni+Mo with carbon content of0.2%through0.5%.It is a matter of com-mon knowledge that all the potentialities of i mprovingthe mechanical properties of structural steels by allo-ying and final heat treat ment through individual heating as a terminal operation have been practically ex-hausted.Withthisin view,the method of integrated deformation andthermal production(IDT-prod…     

Computer simulation of combustion of mine fires

According to control theories, mine fires can be considered as an unsteady process after the normal ventilation system is disturbed. Applied the principal of physical chemistry and thermal fluid mechanics, the parameters models of the unsteady state system have been given, such as fuel combustion rate, heat of combustion, concentration, temperature, heat losses, heat resistance, work of expansion and heat pressure difference. The results of the calculation agree approximately with the results of the test. By the computer simulation, it is shown that the main factor of producing the throttling effect is the fire rate, second is the heat resistance and the heat pressure difference. The rate of heat flow that passes through the airway wall is the maximum on the surface, and decrease with time. The heat transfer progresses only within the range of 0..5 m away from theairway wall during combus-tion for 2 hours. It‘s variable for the mass flux rate and the percentage concentration of the gas along the airway of the downstream. When the delayed time is very small, the varidtion can be neglected. Viscosity resistance is the main part of the heat resistance, second is the expansion resistance that is less than tens Pascal when Mach number is very small. Work of expansion is principally tumed into heat losses, only a very small part is consumed by the work of the heat resistance and the inertia acceleration.     

Increase of mechanical properties of hot plate due to introduction of a cycle of high-speed asymetry of work rolls on four-high mill 5000

Asymmetry of plastic deformationfor hot plate mill is reached,first of all,due to a mismatch of linearspeeds of work rolls.The mismatch of speeds of rolls results too occurrenceinthe center of deformation ofa zone with opposite directedforces of friction andincreases a shift component of deformation,that favora-bly affects study of a microstructure of rolled stock[1,2].Realization of process of asymmetry carried out with the help of software and automation of technolo-gy.This systemprovides in…     

Application of fuzzy integrated evaluation in the safety of coal industry of China

Based on fuzzy integrated evaluation theory, the safety of coal industry was analyzed, the factors affecting the safety of coal industry was considered, and its fuzzy integrated estimating theory and results were given. Finally this paper proposed a new method of industry safety estimation. According to this method, we can integrate the factors affecting coal industry and deal with the parameters and targets of evaluating factors by quantitative analysis, thus give a scientific and reasonable safety degree analyzing evaluation.     

Computer study of elastic properties of small nanoparticles

The density functional theory and the method of pseudopotentials (quantum mechanical calculationsfromfirst principles) were used to study reactions of small nanoparticles aluminum(2 -13 atoms) ,silicon(5 -18 atoms) and zirconia (18 -30 atoms) on compression and tension.It has been found that elasticmodules (Young modules) decrease withincreasing of the number of atomsin nanoparticles ,however theirvalues overesti mate those typical for bulk materials . Differences of atomic structures and elas…     

Effect of mechanical properties of matrises on the tribological behaviour of particulatereinforced aluminium alloy composites

In recent yearsincreasinginterest is beingfocused onthe tribological performance of metal matrix com-posites ( MMCs) . The complex wear tests showthat tribological behavior of MMCs depends onthe testingconditions (i .e .type of contact applied load and speed of relative motion) as well as on material parame-ters ,such as properties of the reinforcing phase (nature ,size ,geometry and hardness) ,properties of thematrix (strength and ductility) and also characteristics of the bonding between r…     

Influence of the substrate thickness on texture of tape

1 IntroductionThree different approaches are applied to increase the engineering current densuity of the coated con-ductor . The first is to enhance the critical current density of the YBCOfil m[1 -3]. The secondis toincreasethe thichness of the YBCOfil m[1 -3]. The third is to reduce the thickness of the metallic tape[4]. For theRABi TS technique the metallic tape has to provide the cube texture for the epitaxial fil m and sufficientstrength . Therefore it is necessarytoincrease the tap…     

Life of Mozart

Wolfgang Amadeus Mozart was born on January 27,1756.His hometown was Salzburg,Austria.He was a musical genius.He created more than 600 works of music.Greg:What are you reading about,Megan?Megan:A really famous person.Greg:Who?Megan:Mozart!     

Numerical simulation of influence of shear dilatancy on deformation characteristics of shear band-elastic body system

The paper was numerically focused on investigation of deformation, failure and instability of shear band-surrounding elastic reck system in plane strain direct shear test considering shear dilatancy according to fast lagrangian analysis of continua (FLAC). The adopted failure criterion was a composite Mohr-Coulomb criterion with tension cut-off and post-peak constitutive relation of rock, i.e. linear strain-softening. Numerical results show that dilation angle affects the responses of elements, the number and the position of yielded elements. Increasing dilation angle results in higher load-carrying capability of elements, higher deformation or strain corresponding to peak stress, less brittle post-peak stress-deformation curve. Strain-hardening behavior can occur if dilation angle is high.Therefore, shear band-elastic reck body system tends to be stable and rock burst does not occur as dilation angle is increased. Moreover, the number of yielded elements is increased with dilation angle increase and two‘ parallel plastic zones initially generated in the middle of two loading ends of specimen no longer remain collinear, reflecting increase in deformation resistant of the system. Evolution of volumetric strain rate was investigated based on three-dimensional curved surface diagrams. Approximately, volumetric strain rate concentration regions coincide with plastic zones. Volumetric strain rate in yielded elements is very evident. However, in elastic zones volumetric strain has not been nearly changed throughout the numerical tests.     

Extraction of precious metals from technogenic placers of primorye

The centuries-old mining of gold fromplacers of Pri morye resulted in significant exhaustion of its re-serves.This has not failed to adversely affect the production of precious metals.At the same ti me,thereare grounds to assume that potential resource of placers of the regionis far fromfull exhaustion.It can beinferred if only by the fact that inthe process of service,onlylarge particles of metals were evacuatedfromplacers,and small and fine particles,the share of which is about20%of the init…     

Anticorrosive properties of extracts from waste of rice processing

The application of corrosion inhibitors for metal protection is one of the most si mple and accessiblemethod.Different classes of organic substances areinvestigated as corrosioninhibitors,unfortunately,onlya feworganic substances possess a unique combination of the physical,chemical and toxicological proper-ties,allowing to use themas effective and environmentally safe inhibitors for mild steel corrosion.In thisconnection search of new,cheap and ecologically safe corrosion inhibitors is an act…     

Analysis of the mechanic characteristics of the damage propagation of rock under 4riaxial stress condition

The advanced computerized tomography is applied to study the damage propagation of rock. The real-time CT scanning is carried out to the damage propagation of rock under triaxial stress condition. The damage propagation constitutive relation of rock under triaxial stress condition is analyzed at last.     

Formation of new functional materials and device heterostructures on the basis of nanosystems of superionic conductors

Search for conditions of conservation of fast ionic transport (FIT) in nanosystems of advanced superi-onic conductors (ASIC)[1 -4]and synthesis of newtypes of device thin-fil mheterostructures on this basis isa fundamental scientific problem. ASICs (α-AgI ,solid electrolytes of the family RbAg4I5,etc .) are crys-tals with a record highlevel of ionic conductivity and alowvalue of activation energy E~0 .1 eV.The crys-tal structure of ASICis close to opti mal for FIT, however it is dist…     

Effect of electric potential and heating on surface of KCl

The purpose of the work is research of morphology of structural changes of a surface{100}crystalsKCl under action of heating and electric field potential enclosed to one of fasets of a crystal.In experi ments used samples with the sizes20×8×2÷3mm which was prepared froma large block.One side of a crystal contacted to an electrode.Reliability of contact was provided by a powder(10mi-crons)of a researched crystal which at heating and si multaneous compression conglomerated with a crystaland …