PIEZOQUARTZ GAS SENSOR RESPONSE TO SOME HYDROCARBONS
S.S. Ryasenskii, N.V. Melnikov
Tver state University
Chair of inorganic and analytical chemistry
Proposed the design of the gas sensor based on quartz resonator. Shows the possibility of using it
for defining the content of isooctane and hexane in the air.
Keywords: sensor, resonator, quartz micro balances.
ION-SELECTIVE ELECTRODE FOR DETERMINATION
OF DROTAVERIN DRUGS
G. I. Mantrov, I. V. Kobelinskii, S. S. Ryasenskii
TverStateUniversity
Chair of inorganic and analytical chemistry
The construction and electroanalytical characteristics of ion-selective electrode (ISE) for drotaverine
hydrochloride are described. Ion association complexes of the drug were tested as electroactive
materials for ionometric sensor controls. The ISE was used for direct potentiometry of drotaverine
hydrochloride.
Keywords: ion-selective electrode, complexes, sensor, potentiometry.
WAYS OF LIGNIN PROCESSING WITH BIO OIL OBTAINING
E.I. Shimanskaya, E.M. Sulman, A.A Stepacheva, Yu.М. Lugovoy,
L.Zh. Nikoshvili
Tver State Technical University
Department of Biotechnology and Chemistry
This article examines the processes of hydrogenolysis and oxidation as an alternative to the
pyrolysis of lignin during processing to produce bio.
Keywords: lingnin, hydrogenolysis, hydrotreating, oxidation, pyrolysis.
ЕFFECTS OF STRESS ON THE SKIN (OVERVIEW)
V.V. Zhigulina
Tver State Medical Academy
Department of Biochemistry with the Course of Clinical Laboratory Diagnostics
The article presents a survey of the literature relevant to the influence of stress on the structural
changes in tissues, including the skin, and development of skin diseases. The present paper analyzes
the data on stress proteins, provides the results of the changes in protein, carbohydrate and lipid
indices of the skin under stress and during the post-stress period. New evidence has been received that
under stressful conditions the number of common lipids and common phospholipids in the skin
increases. Special attention is paid to the «delay» of the changes in the skin lipid components under
water and immobilization stress, i.e. the first significant parameter changes occur approximately 24–
48 h after stress.
Key words: stress, stress proteins, skin disorders, oxidative stress, immobilization stress
ELEMENTS OF PREVENTIVE DENTISTRY. IMPACT
OF FLUORIDE ON ORAL HEALTH PROMOTION AND SYSTEMIC FLUOROSIS
PREVENTION
Yu.N. Borinsky1, B.N. Davydov2, E.Yu. Borinskaya1, N.V.Borinskaya3, V.V. Zhigulina1
1
Tver State Medical Academy
Department of Biochemistry with the Course of Clinical Laboratory Diagnostics Faculty of Postgraduate
Studies
2
Department of Pediatric Dentistry
3
Women's consultation number 3
The objective of the study was to assess actual fluoride intake by exclusively breast-fed and mixed-fed
infants, and offer a method of its correction for formula-fed infants to prevent systemic fluorosis. The
study aimed at identifying sources of fluoride and its amount that a fetus receives during prenatal
development and an infant receives after birth during exclusive breastfeeding, mixed feeding or
formula feeding, and developing a method of fluoride intake correction for formula-fed infants.
Results. The study reveals excessive (tens to hundreds of times higher than the safe level) fluoride
intake in infants receiving formula feeding that eventually leads to high prevalence of systemic
fluorosis in children and adults. Conclusion. Controlling fluoride intake by children based on their age
is the best preventive oral health measure.
Keywords: fluoride, dental caries, fluorosis.
VALUE LIQUID COMPLEX MICROELEMENT ADDITIVES. MODERNIZATION
PROCESS FOR PRODUCING
FEED WITH ITS PARTICIPATION
V.V. Lebedev, G.Yu. Rabinovich
TSTU, Tver
Illustrates the use of the preparation of feed additives patented complex liquid containing succinic acid
chelate with trace elements - iron, manganese, zinc, copper, cobalt, selenium, iodine, and methionine.
Proven process and designed equipment allow you to enter the feed additive with a given
concentration and the required performance.
Keywords: liquid complex additive, trace elements, technological scheme and equipment for the
preparation of feed.
PROPERTIES OF CATIONIC SURFACTANTS IN THE SOLUTION OF CHEMICAL
COPPER PLATING
L.I. Voronchikhina, O.E. Zhuravlev, N.V. Verolaynen, N.I. Krotova,
I.A. Presnyakov
Tver State University
The properties of the cationic surfactants pyridinium series which differ in length and structure of the
hydrocarbon radical. It has been established that the tested salts resistant to hydrolysis plating solution.
The presence of components of copper plating solution has no effect on the colloid-chemical
properties examined salts.
Keywords: surfactants, plating, copper plating.
SYNTHESIS, SPECTRAL CHARACTERISTICS
AND PHYSICOCHEMICAL PROPERTIES
OF TETRACHLOROFERRATE (III) N-DETSILPIRIDINIUM
O.E. Zhuravlev, L.I. Voronchihina, N.I. Krotova
Tver State University
Synthesized low-temperature ionic liquid tetrachloroferrate (III) N-detsilpiridinium. The dependence
of density and absolute viscosity with temperature. Investigated the thermal stability and magnetic
properties of ionic liquid. Quantum-chemical calculations of the structure density functional DFT
library B3LYB using the basis 6-31G (d, p) .
Keywords: ionic liquids, paramagnetism, quantum-chemical calculations, thermal stability,
physicochemical properties, tetrachloroferrate.
STUDY OF FREE RADICALS ELECTRONIC STRUCTURE
IN FRAMEWORK QUANTUM THEORY
OF ATOMS IN MOLECULE. 1-ALKEN-1-ILS.
V.N. Sitnikov1, E. M. Chernova1, V. V. Turovtsev1.2, Yu. D. Orlov1
1
Tver state university
Tver state medical academy
2
Equilibrium structures of CH3(CH2)nCH=CH free radicals were found by method B3LYP/6311++G(3df, 3pd), and their electronic density distributions were studied in framework of «quantum
theory of atoms in molecule» (QTAIM).
Keywords: quantum theory of atoms in molecule, electron density distribution, inductive effect, charges at
atoms, spin density, relation «structure - property».
STUDY OF FREE RADICALS ELECTRONIC STRUCTURE
IN FRAMEWORK QTAIM. 1-ALKEN-2-ILS
V.N. Sitnikov1, E. M. Chernova1, V. V. Turovtsev1.2, Yu. D. Orlov1
1
2
Tver state university
Tver state medical academy
Equilibrium structures of CH3(CH2)nC=CH2 free radicals were found by method B3LYP/6311++G(3df, 3pd), and their electronic density distributions were studied in framework of «quantum
theory of atoms in molecule» (QTAIM).
Keywords: quantum theory of atoms in molecule, electron density distribution, inductive effect, charges at
atoms, spin density, relation «structure - property».
SELF-ASSEMBLY IN THIN BLOCK COPOLYMER FILMS
I. Neratova
Ulm University, Ulm, Germany
Leibniz Institute of Polymer Research, Dresden, Germany
Solvent evaporation from symmetric diblock copolymer solution was simulated by dissipative particle
dynamics. The kinetics of lamella phase formation upon solvent evaporation process was compared
with the self-assembly in a diblock copolymer melt. The role of a solvent during the evaporation
process is discussed. It was found that during the solvent evaporation process the equilibrium
morphology is reached escaping local energy minima, whereas the self-assembly of diblock
copolymers in a melt is following different kinetic paths with many metastable states.
Keywords: dissipative particle dynamics, diblock copolymer film, lamellar phase, solvent evaporation.
RAPID METHOD ASSESSING RATIO OF ENANTIOMERES
OF LACTIC ACID CYCLIC DIMERS
L.E. Karpukhin, V.M. Spiridonova, E.A. Brovina, T.I. Samsonova,
A.G. Petrov, S.I. Shkurenko
AO «VNIISV», Tver
The formation of self-crystalline phase of the racemic mixture of optically active isomers of lactide
was discovered. The crystals of this phase is significantly different from the crystals of optically pure
enantiomers, which allows the use of optical microscopy as a rapid method for assessing the quality of
lactide.
Keywords: lactic acid, microscopy, lactide.
COLD CURING OF VINYL ESTER RESINS
AND MEANING OF POSTCURE PROCESS
I.I. Spiridonov1,2, E.I. Laguseva1
1
2
TSTU, Tver
JSC "Tverstekloplastik", Tver
The mechanism of curing vinyl ester resins has been reviewed as an irreversible process. The
change of the surface hardness of the samples as a function of time and temperature of postcure has
been studied. The study is important in the manufacture of large and thick-walled composite
products and constructions.
Keywords: vynil ester resin, surface hardness, postcure.
APPLICATION OF ELECTROLYTE MODELS
FOR CORRELATION OF VAPOR-LIQUID EQUILIBRIUM DATA
IN THE TERNARY SYSTEMS
«METHANOL – ACETONE – ALKYLPYRIDINIUM SALT»
A.N. Evdokimov, A.V. Kurzin, A.D. Trifonova, M.A. Radin,
O.V. Fedorova
Saint-Petersburg State Technological University of Plant Polymers
Institute of Technology
Electrolyte models NRTL, UNIQUAC и UNIFAC were used for correlation of vapor-liquid
equilibrium data in the systems methanol – acetone – N-butylpyridinium hexafluorophosphate and
methanol – acetone – N-benzylpyridinium tetrafluoroborate. These models represent the experimental
data with required accuracy. Average mean absolute deviations of mole fraction of solvents in vapor
phase were 0,006–0,008.
Keywords: vapor-liquid equilibrium, methanol, acetone, N-butylpyridinium hexafluorophosphate, Nbenzylpyridinium tetrafluoroborate, electrolyte models, NRTL, UNIQUAC, UNIFAC.
INFLUENCE OF IMMERSION LIQUID ON UV SPECTRA OF POROUS POLYMERIC
MATERIALS
V.E. Sitnikova, S.D. Khizhnyk, I. S. Kuryndin, G. K. Elyashevich,
P.M. Pakhomov
1
2
Tver State University, Tver
Institute of Macromolecular Compounds, Russian Academy of Science, St. Petersburg
The effect of immersion liquid on the scattering in the UV spectra of porous films of polyethylene,
track membranes of PP and PET with different pore sizes was investigated using a spectroscopic
approach. It is shown that for the leveling effect of scattering, can be used an immersion liquids
with a refractive index close to the value of the refractive index of the sample and with affinity
between the liquid and the sample.
Keywords: porous PE film, the spectroscopic approach, total porosity, pore size distribution
INVESTIGATION OF THE ELECTRON STRUCTURE
OF La(Fe1-хCoх)Siy COMPOUNDS BY MEANS OF HALL EFFECT
D.Yu. Karpenkov1, F.O. Denisov1, K.P. Skokov2, E.L. Airiyan1,
A.Yu. Karpenkov1, Yu.G. Pastushenkov 1
1
Tver State University
Department of Magnetism
2
Technical University of Darmstadt, Darmstadt, Germany
Investigation the electron structure of La(Fe1-хCoх)Siy compounds was studied by means of anomalous
and normal Hall effect in a wide range of magnetic field and temperatures. It was found that for alloys,
characterized with the first order transition from ferromagnetic state to paramagnetic state, the main
mechanism of conductivity is hole conductivity. In the vicinity of the Curie point the sign of normal
Hall effect coefficient tends to change. With the substitution of iron atoms with cobalt in these
compounds together with change of order of phase transition a change to the electron conductivity is
observed. Anomalous Hall effect in these compounds is mainly determined by the contribution from
the external skew scattering mechanism.
Keywords: anomalous and normal Hall effect, the electronic structure, materials for magnetic
refrigeration.
MICROSTRUCTURE AND MAGNETIC DOMAIN
STRUCTURE OF Со3В
O.V. Zhdanova, M.B. Lyakhova, E.M. Semenova, D.Yu. Karpenkov, A.Yu. Karpenkov
Tver State University
The microstructures and magnetic domain structures of coarse-grained Co-B alloy were examined
with optical microscopy and scanning electron microscopy. It was shown that Co3B phase contain
stripe domain structure and branching of magnetic domains. Co3B magnetic domain structure is
typical for orthorhombic ferromagnetic.
Keywords: metallography, microstructure, magnetic domain structure, ferromagnetic