The development of titanium silicide - boron doped polysilicon resistive temperature sensors

Thin films of titanium silicide $(TiSi_2$) formed on heavily boron-doped polycrystalline silicon $(poly-Si/B^+)$ were applied for the first time for resistive temperature sensing. The temperature sensors exhibited a high-temperature coefficient of resistance of 3.8 x 10^{-3}^{\circ}\mathrm{C}^{-1}, a linear dependence of resistance on temperature and an excellent thermal and electrical stability up to 800 $^{\circ}\mathrm{C}$. This work discusses the fabrication method and the morphological and electrical characterization of the $TiSi_2/poly-Si$ thin film resistors throughout the stages of its formation

Quantum-chemical calculation of 1-bis(dimethlamino)-4-bis(trimethylsilyl)- 2,3-diphospha-1,3-butadiene

According to the results of ab initio quantum-chemical calculation 1-bis(dimethylamino)-4-bis-(trimethylsilyl-2,3-diphosphabuta-1,3-diene exists as an E-isomer where electronic delocalization occurs involving donor dimethylamino and acceptor trimethylsilyl groups and also the multiple P=C bonds

The dipole moments and structure of organophosphorus compounds: Vector-additive scheme

The dipole moments of bonds formed by phosphorus in different coordination states were generalized, tabulated, and analyzed. The general and "fractional" vector-additive schemes for calculating dipole moments are discussed. The high electronic lability of the majority of bonds formed by phosphorus was shown to require care in the use of their polarities for studying the spatial structure of organophosphorus derivatives and electronic interactions in them. In all instances, the environment of the phosphorus atom in model compounds should be closest to that in the molecule under study. Using the method of dipole moments in combination with the complementary electro- and magnetooptical and spectral methods increases the reliability of the results. Copyright © 2005 by Pleiades Publishing, Inc

Theoretical conformational analysis of organophosphorus compounds

Published data on the theoretical conformational analysis of acyclic tri- and tetracoordinate phosphorus compounds by quantum-chemical methods are generalised and systematised. Theoretical results are compared with experimental data for a wide range of such compounds. The main characteristics and fine conformational details of their structures are considered. © 2005 Russian Academy of Sciences and Turpion Ltd

Local antibiotic therapy options for treating acute rhinosinusitis in children

The article presents various types of acute rhinosinusitis progression in pediatric practice depending on the duration of the disease, based on the available modern consensus papers and clinical guidelines. The main clinical terminology of the nosological forms of rhinosinusitis was determined, and aspects of their differential diagnosis and stages of the treatment were studied. The authors provided insight into disease pathogenesis, taking into account literature review data on the spectrum of the most common bacterial agents of the nose and paranasal sinuses pathologies. The available data on the treatment of rhinosinusitis are summarized from the perspective of consensus papers and modern clinical guidelines of the Ministry of Health of the Russian Federation, the use of which for the prescription of treatment is the most important quality criterion for medical care provided. A clinical case of the treatment of acute bacterial uncomplicated rhinosinusitis in a 12-year-old child is described. In this case, an aerosolized form of topical antibiotic therapy combined with a mucolytic component was used as a drug of choice alongside with the standard irrigation-elimination therapy and nasal decongestants, which gives an advantage in achieving the maximum effective concentration of the active substance at the site of inflammation. A drug with a mucoactive effect helps to decrease mucus viscosity and discharge, and at the same time facilitates the entry of an active substance into the tissues and inhibits bacterial adhesion to the epithelium of the respiratory tract. Antibacterial component – thiamphenicol, a derivative of chloramphenicol with a mechanism of action associated with inhibition of bacterial protein synthesis has a broad spectrum of action and a maximum degree of accumulation and action in the site of inflammation due to the method of delivery to the epithelium of the respiratory tract

Mechanism of the hydrolysis reactions of 1-hydroxysilatrane and 1-hydroxygermatrane, 2,2-dihydroxysilocane and 2,2-dihydroxygermocane

© 2016 Taylor & Francis Group, LLC.The mechanism of the hydrolysis reactions of 2,2-dihydroxysilocane, 2,2-dihydroxygermocane, 1-hydroxysilatrane, and 1-hydroxygermatrane was studied by the density functional theory method. According to the quantum chemical calculations, the reactions of hydrolysis for 2,2-dihydroxysilocane and 2,2-dihydroxygermocane are characterized by the lower values of activation energy than for 1-hydroxysilatrane and 1-hydroxygermatrane. The ring configurations of the hydrolysis products are stable due to the presence of transannular interaction N→X (X = Si, Ge) and intramolecular hydrogen bond in their molecules

Conformational analysis of 1,3,2-dioxaphospholane and pyrocatehine phosphite with Oc(O)Cf 3 exocyclic substituents

Conformational analysis of 1,3,2-dioxaphospholane-2-yl-2,2,2- trifluoroacetate and 4,5-benzo-1,3,2-dioxaphosphole-2-yl-2,2,2-trifluoroacetate was carried out by dipole moment method and quantum chemical calculations (DFT B3LYP/6-31G). © 2013 Copyright Taylor and Francis Group, LLC

Polarity of selected derivatives of diselenophosphinic acid

© 2017, Pleiades Publishing, Ltd. Polarity of diselenophosphinates in benzene solution has been determined by second Debye method. We suggest that these compounds exist as a mixture of several conformers with cis and gauche arrangement of substituents at the phosphorus atom with respect to the P=Se bond

Mechanism of the Reactions of (2,2-Dimethyl-1-((Trimethylsilyl)Oxy)Propylidene)-(Trimethylsilyl)Phosphine with Nucleophilic and Electrophilic Reagents

Copyright © 2015 Taylor & Francis Group, LLC. The mechanism of the reaction of 3,3-dimethyl-2-trimethylsiloxy-1-trimethylsilyl-1-phosphabut-1-ene with bis(phenylendioxy)chlorophosphorane was studied by the density functional theory method. According to the quantum chemical calculations this interaction occurs in parallel on two reaction centers: PII atom (electrophilic substitution) and O atom (nucleophilic substitution)

Conformational analysis of 2-substituted nitroethenes

Experimental and theoretical conformational analysis of polyfunctional 2-substituted nitroethenes was carried out by the method of dipole moments and density functional theory calculations. It was established that the nitro and ester (or trichloromethyl) groups are trans-arranged in the molecules of 2-trichloromethyl-(ethoxycarbonyl)-1-nitro- and 1-bromo-1-nitroethenes, i.e., nitroalkenes have E-configuration, their bromo-containing analogues have Z-configuration, and s-cis-orientation of the C=C and C=O double bonds is preferred for nitroacrylates. 2,3-Dibromo-3-nitroacrylates have untrivial Z-configuration in solution. © 2010 Springer Science+Business Media, LLC