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Article
Iron-Ruthenium Catalysts for Ammonia Synthesis: the Relationship of Structure and Function
The interrelation of the structure and catalytic properties of hydrogen-reduced iron-ruthenium systems in the ammonia synthesis reaction is studied by X-ray diffraction (XRD), as well as conversion and absorpt...
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Article
Phase Equilibria in the Sm2O3–Fe2O3–Ta2O5 System: Structural Transitions and Magnetic Properties of the Solid Solution Sm2 – xFe1 + xTaO7
An isothermal section of the Sm2O3–Fe2O3–Ta2O5 system was constructed in the subsolidus region at 1200°C. A region of the Sm2 – xFe1 + xTaO7 solid solution with the cubic pyrochlore structure (space group Fd ...
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Article
Microwave-Stimulated Conversion of a Tar/Lignin Blend into Hydrocarbons in a Plasma-Catalytic Mode
The study is devoted to the conversion of tar and iron-modified lignin under the action of microwave radiation. Lignin containing 0.5 wt % Fe absorbs about 80% of the supplied microwave radiation (2.45 GHz), w...
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Article
Static and Dynamic Characteristics of Machine Tools with an Adhesive–Mechanical Support System
The design of supporting components in machine tools on the basis of an adhesive–mechanical support system is considered. Hindrances to the wide use of such components are considered. An algorithm is proposed ...
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Article
Simulation of Dampers Made of Viscoelastic Materials
Taking dam** into account in the problems of structural dynamics is an important and nontrivial problem. Its complexity is primarily determined by the required specification of correct characteristics of the...
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Article
Conceptual Design of Metal-Cutting Machines
The basic steps for rapid development and conceptual design of metal-cutting machines are proposed. The benefits of design on the basis of determinate efficiency criteria are noted.
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Article
m-Cresol Chemisorption on a Porous Iron-Containing Sorbent Prepared from the Carbon Residue after Lignin Processing: II.1 Effect of m-Cresol Chemisorption on the Structural Features of Iron-Containing Components
The structure of Fe-containing components of the carbon adsorbent prepared from the residue after carbon dioxide lignin reforming stimulated by microwave radiation was studied before and after the m-cre...
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Article
Structural Transformation of a (1 – x)Fe2O3–xRuO2 Nanosystem at Different Reduction Temperatures
The phase composition and structure of oxide and hydrogen-reduced iron–ruthenium systems are studied using conversion and adsorption Mössbauer spectroscopy, as well as X-ray diffraction methods. In samples wit...
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Article
Improving the Machining Process in Band-Saw Systems
In machining on band-saw systems, the kinetics of the working unit with variable inclination is considered. A new design is proposed for the band cutter. Units assisting in the effective control of band-saw mo...
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Article
Dialog-Based Calculation of Dimensional Relations between Machine Parts
We consider computer software for automated calculation of the dimensional relations of machines in terms of the rated values and tolerances, in the light of the selected method for ensuring precision.
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Article
Fibrillar Biocomposite Based on Poly(3-hydroxybutyrate) Nanofibers and Iron Oxide Magnetic Nanoparticles
Novel biodegradable biocomposites based on poly(3-hydroxybutyrate) nanofibers with embedded iron oxide nanoparticles enriched with 57Fe isotope have been studied by transmission electron microscopy (TEM), Mössbau...
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Article
Forced Vibration of an Annular Cross Section in Combined Cutting and Deformation
The sha** process in the combined cutting and deformation of flexible hollow shafts is considered. Deformation of the cross section is taken into account.
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Article
Structure, Magnetic and Photochemical Properties of Fe–TiO2 Nanoparticles Stabilized in Al2O3 Matrix
Fe–TiO2 nanoparticles with Fe concentration from 0.24 to 5 wt % were synthesized in a Al2O3 matrix through multiple impregnations from organic solutions of Ti n-butoxide and Fe acetylacetonate. Microstructure, mo...
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Article
Cutters for Machining End Channels
The article outlines a new approach to the design of specialized high-performance cutters for the machining of end channels.
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Article
New Milling-Machine Design
For many years, the structure of milling and drilling machines has remained basically the same: the spindle chuck is attached in cantilever fashion to the vertical column. In the present work, a new configurat...
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Article
Fe-containing nanoparticles used as effective catalysts of lignin reforming to syngas and hydrogen assisted by microwave irradiation
Active iron-containing nanosized components have been formed on the lignin surface. The metal was deposited on the lignin from an ethanol solution of Fe(acac)3 and from a colloid solution of iron metal particles ...
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Article
Chemical assembly of the heteronuclear pivalate complex with the LiI and FeIII ions
The heteronuclear complex [Fe4Li2(O)2(Piv)10(H2O)2] (1, Piv is the pivalic acid anion) was obtained by refluxing FeIII pivalates with LiI pivalates in toluene and isolated as the 1•PhCH3 solvate with a toluene mo...
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Article
Hybrid Biodegradable Nanocomposites Based on a Biopolyester Matrix and Magnetic Iron Oxide Nanoparticles: Structural, Magnetic, and Electronic Characteristics
The structural, electronic, and magnetic properties of iron oxide nanoparticles encapsulated in hybrid biodegradable therapeutic systems based on poly-3-hydroxybutyrate and chitosan are comprehensively studied...
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Article
Hydrogen Sulfide-Resistant Bifunctional Catalysts for the Steam Reforming of Methane: Activity and Structural Evolution
Results are presented from studying an iron–nickel catalyst for the steam reforming of methane, synthesized by epitaxial coating on the surface of spherical pellets of commercial γ-Al2O3. It is shown the catalyst...
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Article
Hybrid materials based on polymethylsilsesquioxanes containing Fe, Pt, and Fe–Pt metallic nanoparticles
New hybrid materials based on Pt, Fe, and Pt–Fe nanoparticles stabilized in a matrix of polymethylsilsesquioxane nanogel and ultrahigh molecular weight polyethylene (UHMWPE) were prepared. Metal vapor synthesi...
