A Study of Plasma-Sprayed Nanocomposite Coatings Based on Magnesium-Substituted Tricalcium Phosphate

A technique for plasma spraying of a magnesium-substituted tricalcium phosphate powder has been developed; optimum modes of the plasma-jet arc current and the particle size of the sprayed powder have been determined. It has been found that the structure of the resulting coating contains microparticles and nanoparticles with a size of up to 90 μm and up to 100 nm, respectively. The adhesion of the substituted coatings is 13 MPa; on average, it is 20% higher than the adhesion of coatings based on unmodified powders.     

Functional Composites: Low-Temperature Extraction-Pyrolysis Synthesis and Its Properties

Prospects of applying the extraction-pyrolysis method to fabricate complex oxide composites, including nanoscaled ones, based on rare-earth elements, iron, magnesium, bismuth, zirconium, tantalum, niobium, platinum, and other elements bearing practically significant functional properties—magnetic, optical, and catalytical—are investigated. The composition, morphology, and properties of the synthesized functional materials are examined.     

Optimal Tool Design for Grinding Operations

An algorithm is outlined for the design of abrasive tools of optimal structure for a specific grinding operation, ensuring maximum productivity and minimum cost. Systems analysis is employed. Mathematical models for the design calculation are presented, and an example is given to illustrate the optimization of grinding tools.     

Leaching of Radioactive Waste Surrogates from a Glassy Matrix and Migration of the Leaching Products in Gneisses

Changes in the glassy matrix containing high-level waste surrogates after 24-h heating in an autoclave at 300°С with steam at 66% relative humidity were studied. Experiments were performed with an Na–Al–P glass sample containing Cs, Sr, Ce, Nd, and U. The effect of crystallization on the leaching of the elements from the glassy matrix and the form in which the waste surrogates are released into water were determined. The transport of the leaching products in a gneiss sample taken from the core of a borehole of the Yeniseiskii site of the Nizhnekansky massif was studied. REE and U occur in the solution after leaching mainly in the colloidal form. Colloidal particles of elements exhibit high mobility in migration in the rock.     

Optimization of the Sintering Parameters for Materials Manufactured by Powder Injection Molding

Powder Metallurgy and Metal Ceramics - The properties of sintered and heat-treated steels produced from the Catamold 8740 material by powder injection molding were examined. Parts made of the...     

Milk from cows fed a diet with a high forage:concentrate ratio improves inflammatory state,oxidative stress,and mitochondrial function in rats

Excessive energy intake may evoke complex biochemical processes characterized by inflammation, oxidative stress, and impairment of mitochondrial function that represent the main factors underlying noncommunicable diseases. Because cow milk is widely used for human nutrition and in food industry processing, the nutritional quality of milk is of special interest with respect to human health. In our study, we analyzed milk produced by dairy cows fed a diet characterized by a high forage:concentrate ratio (high forage milk, HFM). In view of the low n-6:n-3 ratio and high content of conjugated linoleic acid of HFM, we studied the effects of this milk on lipid metabolism, inflammation, mitochondrial function, and oxidative stress in a rat model. To this end, we supplemented for 4 wk the diet of male Wistar rats with HFM and with an isocaloric amount (82 kJ, 22 mL/d) of milk obtained from cows fed a diet with low forage:concentrate ratio, and analyzed the metabolic parameters of the animals. Our results indicate that HFM may positively affect lipid metabolism, leptin:adiponectin ratio, inflammation, mitochondrial function, and oxidative stress, providing the first evidence of the beneficial effects of HFM on rat metabolism.     

Thermal Analysis of Oxidation of TiB2 Powders for Wettable Composite Protective Coatings for Aluminum Electrolyzer Cathodes

Protection of Metals and Physical Chemistry of Surfaces - The resistance of different TiB2 powders to oxidative degradation is studied by synchronous thermal analysis. The temperature dependence of...