Remote results of treatment of compression fractures of the calcaneus]

Late results of treatment in fractures of the calcanean bone were studied in 72 patients within the terms from 2 to 11 years. In 41 of these cases a grave compression fracture of the calcanean bone was observed, in 9--there was a damage of both calcanean bones. 37 patients were treated clinically and 4--under outpatient conditions. Skeletal extension was used in 12 patients during 10--25 days, in 3--it was complicated with suppuration. Manual reposition was employed in 19 cases, and it was not used in 6. It is the author's opinion that permanent and one-moment skeletal extension by multiple pins inserted under general aneshesia and roentgeno-telecontrol should be preferred.     

Electrosynthesized molecularly imprinted polypyrrole films for enantioselective recognition of l-aspartic acid

The electrosynthesis, overoxidation and characterization of l-aspartic acid (l-Asp) imprinted polypyrrole (PPy) films have been performed by using electrochemical quartz crystal microbalance (EQCM). Following the determination of the optimal electrosynthesis parameters for the formation of a smooth and uniform PPy/l-Asp films, the overoxidized polypyrrole (oPPy) matrix templated with either l- or d-aspartic acid (l-, d-Asp) was evaluated as a potential enantioselective recognition element. Under potentiodynamic conditions and in strongly acidic media a significantly higher sensitivity of the l-Asp acid imprinted overoxidized polypyrrole film (oPPy/l-Asp) for l-Asp than d-Asp was observed. The results suggest the feasibility of preparing molecularly imprinted films by electropolymerization for the enantioselective recognition of amino acids and the suitability of EQCM for both monitoring the selective recognition as well as to electrochemically modulate the binding process.     

Bottom‐Up Synthesis of Advanced Carbonaceous Anode Materials Containing Sulfur for Na‐Ion Batteries

The fabrication of sulfur‐containing carbonaceous anode materials (CS) that show exceptional activity as anode material in Na‐ions batteries is reported. To do so, a general and straightforward bottom‐up synthesis of CS materials with precise control over the sulfur content and functionality is introduced. The new synthetic path combined with a detailed structural analysis and electrochemical studies provide correlations between i) the sulfur content and chemical species and ii) the structural, electronic, and electrochemical performance of the associated materials. As a result, the new CS substances demonstrate excellent activity as Na‐ion battery anode materials, reaching capacity values above 500 mAh g^?1 at a current density of 0.1 A g^?1, as well as high reversible sodium storage capabilities and excellent cycling durability. The results reveal the underlying working principles of carbonaceous materials, alongside the storage mechanism of the Na⁺ ions in these advanced sodium‐ion battery anode materials and provide a new avenue for their practical realization.     

Scientific and practical approaches to creating ceramic refractory materials and technology

A comprehensive methodological approach is proposed for resolving metallurgical problems within the scope of a multistage problem formula “composition – structure – properties” – “technology” – “thermal shock-corrosion-erosion-resistant material” followed by development of material technology and objects conforming to refractory conditions and operating regimes in heating units. Practical scientific approaches are considered for forming heat and corrosion resistant refractory materials. A general structural model is proposed for ceramic refractory technology making it possible by computer modelling to perform systematic analysis, prediction and calculation of specific technological parameters in the main production stages.     

Modeling and calculation of the temperature fields in two-layer articles

A mathematical model and algorithm for calculation of the temperature fields for two-layer articles are developed. Using the new algorithm a program is created and numerical calculations of the temperature fields that develop in a two-layer article (nonswirl nozzle) in the course of preparation of the pony ladle of a continuous-casting machine for service and in its operating regime are performed. With the use of the program and computer software (in light of experimental results) it becomes possible to perform calculations and predict the sintering mode of ceramic refractory materials as well as optimize the temperature and time heat-treatment diagrams of one-and two-layer articles.     

Extraction of high-energy particle beams through the yoke of the synchrocyclotron magnet

A method of obtaining collimated beams of high-energy particles (in particular, pions) is described; this method makes use of the yoke of the synchrocyclotron magnet as the main shield against the direct radiation of the accelerator. The collimators, which are set into channels drilled in the yoke of the magnet, make it possible to obtain beams of pions with energies up to 400 Mev.Deceased.In conclusion, we wish to express our gratitude to A. V. Chestnoi and B. I. Zamolodchikov for valuable advice, to K. A. Baicher and S. I. Zhigoman for drilling the holes in the magnet yoke, and to P. T. Pavlov for the construction of the collimators which were installed in the yoke.