On the basis of numerical method, study has developed a general scheme for solving problems on stress-strain state axially symmetric shell molds. The mathematical model process casting melting metal into molds and hardening castings. results solution problem have showed that stresses σ 22 highest values, 11 order magnitude smaller 33 vary over time space like , but they are 5-10% less in absolute values. calculations show mold starts 31 seconds, meanwhile, tensile occur metal-mold surface...

The analysis of the trends for development technological processes to form shell molds shows that accuracy and purity surface shaped castings are one main criteria level science technology foundry engineering. equations continuum mechanics thermal conductivity numerical method were used build a mathematical model SSS multilayer mold determine temperature fields in solidifying casting, thickness solidified layer stress, strain, displacement layers against each other, as well ferrostatic...

The paper describes a method of vanadium adsorption from acidic solutions on highly-developed surface the activated charcoal, modified by cationic surfactants. It is estimated that in an media polyanions are mainly sorbed. was proved ions copper, nickel, iron, calcium, magnesium, sodium and potassium do not interfere sorption extraction aqueous solution. best values charcoal sorbent obtained pH range 2 to 4, i.e. medium. In medium hydroxides other metals form precipitate, thus enabling...

При склеивании массивной древесины для повышения производительности и сокращения времени отверждения клеевого шва применяют различные методы интенсификации склеивания, например такие, как высокочастотный, инфракрасный, конвективный или контактный нагрев, которые являются энергозатратными. В настоящее время актуальна разработка новых энергоэффективных способов склеивания высокопрочных клеевых композиций, обладающих минимальным временем отверждения. работе рассматривается совершенствование...

The possibility of using an intercalated montmorillonite for separation cesium and strontium radionuclides from aqueous solutions was studied in this work. distribution coefficients Cs Sr were Kd = (2.5 ± 0.2)×103 L/kg. time achieving sorption equilibrium did not exceed 10 minutes that indicates the external diffusion as limiting stage sorption. Adsorption occurs due to formation a monolayer pores sorbent it can be described by Langmuir equilibrium. Separation result poly layer adsorption...

Abstract The article discusses the features of experiment planning in development paint compositions for formation protective and decorative coatings on wood products. Conclusions are drawn about relevance study, problems identified when finishing with epoxy paints varnishes requirements them given, as well a characteristic substrates which coating was formed during experiment. chemical composition based resin is considered. authors proposed structural scheme coating, technology its expected...

A laser with a radial transverse discharge was found to operate effectively at above-atmospheric buffer gas pressures. specific energy output of 25 mJ/cm3 obtained the melting point copper (1500?C) for neon pressure 1.5 atm and pump current density 100 A/cm.

Investigations carried out on a coaxial copper vapor laser showed that, varying the excitation frequency from 0.5 to 6.0 kHz, energy deposited in discharge increased 10 70% of storage capacitor energy. There were two serious limitations increasing pump power, imposed by constriction and generation heat active medium. It was shown that use geometry for zone lasers, with both longitudinal transverse discharges, made it possible increase ultimate power substantially without changing average...

Modified sorbents based on montmorillonite hydrosols were obtained. Sorption of calcium from various solutions was studied. The effect pH and concentration an alkaline agent sorption determined. As opposed to using NaOH as the agent, use Na2CO3 resulted in formation less stable colloidal particles solution and, therefore, process separation occurred more intensively. ions increased with increasing value dosage hydrosol. Thus, modified can be used for aqueous simultaneous elimination a...

Adsorption and coagulation properties of intercalated montmorillonites were studied in aqueous systems containing cesium strontium ions. It was shown that sorption results formation two monomolecular layers this component on the surface montmorillonite. occurs due to monolayer pores mineral. Besides adsorption, sorbent's particles intensified. Slow mixing solution resulted aggregation, large aggregates their sedimentation. aggregation occurred decrease charge as a result ions adsorption....

The paper considers the possibility of using highly dispersed modified aluminosilicates in process extracting hydrogen sulfide from wastewater. problem presence natural waters is due to impossibility such human household activities. Water with a high content sulphide has low organoleptic properties, not suitable for consumption and corrosive. Produced water generated oil production must also be treated. In produced water, further injection into reservoir discouraged, as this can lead...

The article deals with the problem of treatment and purification domestic waste water. Today, many facilities do not have a reagent system are limited only by mechanical biological methods water treatment. We considered possibility using new scheme for wastewater. existing at does always cope tasks It is possible to achieve required values indicators: COD, residual phosphate content, iron etc. under study was treated traditional coagulants (iron chloride aluminum sulfate) highly dispersed...