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…     

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 …     

Numerical simulation of UCG process with the aim of increasing calorific value of syngas

The determination of operational parameters in the underground coal gasification(UCG)process should be considered in two aspects:first,the total coal in each UCG panel must be gasified and second,the calorific value of the produced gas should be acceptable.The main aim of this study is to present a model that meets these aspects and increasing the calorific value of syngas during this process.In order to achieve those aims,eight different increasing scenarios were devised for total gasification of coal per panel.These scenarios included:increasing oxygen injection rate(scenario 1),the amount of steam injection(scenario 2),operation time(scenario 3),cavity pressure(scenario 4),increase operation time and cavity pressure simultaneously(scenario 5),increase steam injection speed and oxygen injection rate simultaneously(scenario 6),increase in cavity pressure,operating time,steam injection rate and oxygen injection rate simultaneously(scenario 7)and also simultaneous increase in the operating time and steam injection rate(scenario 8).The results showed that for producing syngas with a higher calorific value,the following parameters had the most positive effects respectively:operation time,cavity pressure,steam injection rate and oxygen injection rate.Finally,the model validation was performed for the Centralia LBK-1 UCG pilot and the results showed that this model is very close to reality.     

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…     

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…     

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.     

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.     

Fractal characteristics of electric properties of coal

In the light of fractal geometry theory, the characteristics of coal＇s electric parameters （including dielectric constant, alternating conductivity, dielectric loss angle tangent and electric polarization constant） were studied by using literature data. The results are shown that the electrical properties of coal have fractal characteristic. The fractal dimensions of dielectric, alternating conductivity, dielectric loss angle tangent were obtained, and are relative to the content of pyrite sulfur, heat and ash content of coal.     

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!     

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…     

Dynamic model of normal behavior of rock fractures

Based on laboratory tests of artificial fractures in mortar material, established the dynamic constitutive model of normal behaviour of rock fracture,. The tests were systematically conducted under quasi-static and dynamic monotonic loading conditions. The fractures were of different numbers of asperities in contact and were subsequently of different initial contact areas, which imitated the natural rock fractures. The rate of compressive load applied normal to the fractures covers a wide range from 10^-1 MPa/s （quasi-static） up to 10^3 MPa/s （highly dynamic）. The normal stress-closure responses of fractures were measured for different loading rates. Based on the stress-closure relation curves measured, a nonlinear （hyperbolic） dynamic model of fracture, normal behaviour, termed as dynamic BB model, was proposed, which was modified from the existing BB model of static normal behaviour of fractures by taking into account the effect of loading rate.     

Feasibility analysis of remedial scheme of Qilongcun landfill

Based on hydro-geological of Qilongcun landfill, the transportation mathematical model of leachat was established. The boundaries conditions and replenishment of model were determined, The leachate COD density and the water level were simulated, and the model was identified, and then the right model was defined. The right model was used to simulate leachate COD density in the interior, exterior, and peripheral of landfill. The results show that the COD densities are not high. The pollution is slight in the interior of landfill and is little in the exterior of landfill. They are proving the overburden on top of landfill and drain around the landfill is right. The max. density on the south of landfill shows it is scientific that the cisterns are building on the south of landfill. The paper shows the remediation scheme is feasible.     

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…     

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.     

Many Kinds of Pets

Many people have pets.Dogs and cats are popular pets.But some people like different kinds of pets.Rabbits or turtles can be good pets.They aren't noisy.And some people keep lizards or snakes for pets.They are quiet,too.Birds can be good pets,too.But monkeys,bears and alligators are not good pets.They are wild.They can be dangerous.     

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…