Concentration of hepatitis A and B virus antigens using water-soluble polymers

A possibility of using reversibly sedimented polymeric system for the concentration of hepatitis A and B virus antigen has been demonstrated. As polymeric systems, tetrasole-containing polyelectrolytes and interpolymeric complex polymethacryl acid-poly-1-vinylpyrrolidone were used, capable of sedimenting in acid medium and dissolving in media with the neutral pH.     

Production process and the properties of lightweight articles made from ZrO2

Conclusions The rheological and technological properties of mineralized foams based on ZrO₂ suspensions stabilized with Y₂O₃ and foams with gummy resin emulsions have been studied.It is shown that the concentration, the grain composition of the suspension, the foam/solid ratio, and the addition of gypsum have a significant effect on the properties of the foam masses and end products.Lightweight foam blocks of significant size have been obtained; these have excellent user properties.Translated from Ogneupory, No. 8, pp. 40–44, August, 1981.     

Equipment for injection moulding of thermosetting materials based on ceramic and metal-ceramic powders

Results of design and process investigations of the construction of technological equipment for injection moulding of articles with complex shapes from thermosetting materials based on ceramic and metal-ceramic powders are presented. Numerical simulation of the proces of heat transfer is conducted. The parameters of a commercial plant (GShP-2) and of a newly designed plant for injection moulding are determined. The newly designed plant produces a uniform distribution of temperature in the functional loop and creates a thermosetting material and injectible material that are uniform in terms of properties.     

Study of aeroabrasive wear of hot-pressed materials of the B4C-TiB2 system

The results of the studies of aeroabrasive wear of hot-pressed materials of the B₄C-TiB₂ system at different angles of abrasive particles attacks have been considered. It has been shown that the materials wear resistance is essentially affected by the relation of phases in the composite. The formation of 5–10 wt % titanium diboride in a B₄C composite have been defined to provide a high wear resistance because of the increase of the fracture toughness K _Ic from 3.8 to 4.4 MPa·m^1/2 on retention of the high hardness (H _V = 20–23 GPa).     

Equipment for injection moulding of thermosetting materials based on ceramic and metal-ceramic powders

Results of design and process investigations of the construction of technological equipment for injection moulding of articles with complex shapes from thermosetting materials based on ceramic and metal-ceramic powders are presented. Numerical simulation of the proces of heat transfer is conducted. The parameters of a commercial plant (GShP-2) and of a newly designed plant for injection moulding are determined. The newly designed plant produces a uniform distribution of temperature in the functional loop and creates a thermosetting material and injectible material that are uniform in terms of properties.     

Development of Ceramic Items Injection Moulding Technology Using Computer Modeling

Powder Metallurgy and Metal Ceramics - Research projects in foreign materials science were analyzed. Specific technological methods for forming ceramic items were examined. The study presents a...     

Computer Simulation of Physical and Mechanical Processes Running in the Reaction Cells of High-Pressure Installations in the Course of Synthesis of Diamonds

We study the problem of finite-element simulation of coupled nonlinear nonstationary processes of electric conductivity, heat conduction, and thermoplasticity taking into account the phase transitions in the materials. As a practical application, we develop a procedure of computer simulation of the process of spontaneous crystallization of diamonds. We solve the problem of determination of the fields of temperature, stresses, and concentrations of phases in the reaction volume of a high-pressure installation and in the local diamond–melt–graphite system in the course of crystallization of diamonds. It is discovered that these fields are strongly coupled, the solutions obtained for the reaction mixture and local system are characterized by a pronounced mutual influence, and the effect of self-regulation of pressure in the reaction zone exists and takes the form of oscillations of pressure about the line of the graphite–diamond phase transition.