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Densities, ρ, at atmospheric pressure and coefficients of compressibility, k, at p = (10, 25, 50, 75, 100) MPa were measured for aqueous solutions of N,N,N-trimethylglycine (betaine) at T = (278.15, 288.15, 298.15, 308.15 323.15) K. The experimental data have been used to calculate the following volumetric parameters: the apparent molar volume of betaine, Vϕ,2, the molar isothermal compression, KT,m, and the molar isobaric expansion, EP,m, of solutions at all pressures and temperatures studied. Some parameters for infinite dilute solution of betaine in water were also obtained such as limiting partial molar volumes, V 2 ∞ , limiting partial molar isothermal compressions, K T , 2 ∞ , and limiting partial molar isobaric expansions, E P , 2 ∞ . The variation of all these parameters with composition, temperature, and pressure were discussed from the viewpoint of intermolecular interactions in the system.

An algorithm and a program have been created for efficiently batching the slab charge of a continuous heating furnace. The charge is composed with allowance for each slab’s heating group.

The reaction of Cr(CO)6 with 1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene (1, dppbian) affords a chromium complex with the neutral diimine ligand (dpp-bian)Cr(CO)4 (2). The exchange reactions of the compound [(dpp-bian)Cr(μ-Cl)(THF)]2 (3) with LiOH, PhC≡CNa, [(CH3)3Si]2NK, C5H5Na, and C5Me5Na give the corresponding radical-anion derivatives, viz., [(dpp-bian)Cr(μ-OH)]2 (4), [(dpp-bian)Cr(μ-C≡CPh)]2 (5), (dpp-bian)Cr[N(SiMe3)2]-(THF) (6), (dpp-bian)Cr(C5H5) (7), and (dpp-bian)Cr(C5Me5) (8). The titanium and zirconium complexes with the acenaphthene-1,2-diimine dianion, viz., (dpp-bian)2Ti (9) and (dpp-bian)Zr(Cl)Cp (10), were synthesized by the reactions of Na2(dpp-bian) with TiCl4 and CpZrCl3, respectively. All compounds were characterized by IR spectroscopy and elemental analysis. Diamagnetic derivatives 2, 9, and 10 were additionally studied by 1H NMR spectroscopy. The structures of products 2, 4–8, and 10 were determined by X-ray diffraction.

A gallium(I) carbenoid derived from redox-active diimine 1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene (dpp-bian) in complexes with molybdenum may serve either as a neutral [(dpp-bian)Ga:] or an anionic [(dpp-bian)Ga:](-) two-electron donor depending on the electronic state of the transition metal.

The procedure of alumina support modification by treatment with NO was developed and tested for the improvements in the resistance of supported metal particles against sintering. The stabilization effect caused by a formation of aluminum oxynitrides was clearly demonstrated for the model catalysts bearing supported gold.

The paper presents the results of experimental studies in the field of the formation of ceramic coatings using a complex method combining the benefits of microarc oxidation and cold gas-dynamic spraying. These coatings are characterized by high hardness, wear resistance and are an economical alternative to structural alumina ceramic materials for machine supports.

metal layers are calculated in the regime when size quantization of electron motion and their nonlocal contribution to conductivity play an essential role. In the THz region and in helium temperatures, this regime is realized if the thickness of metal layers is comparable to the skin-depth and metal film becomes partially transparent. Due to size quantization, the Landau damping is also quantized, leading to new resonances in surface impedances of metal film. An avoided crossing of these resonances with Fabry-Perot photonic pass bands gives rise to narrow band gaps where, nevertheless, the density of photonic states does not vanish. Such dark photonic states populating the new band gaps exhibit strongly anomalous dispersion and strong decay, as it is required by the Kramers-Kronig relations. The decay is due to the quantized Landau damping and it remains finite even in the collisionless limit.

The densities ρ and coefficients of compressibility k = ΔV/V0 of a binary mixture {ethylene glycol (1) + tert-butanol (2)} in the temperature range of 278.15–323.15 K and pressures of 0.1–100 MPa over the entire range of compositions of liquid phase state are measured. Found that the coefficients of compressibility k of the mixture increase both with an increase in the concentration of tert-butanol and with a rise in temperature and pressure. The excess molar volumes of the mixture, apparent, partial molar volumes, and limiting partial molar volumes of the components are calculated. It is showed that the excess molar volumes of the mixture are negative and decrease when the pressure increases. The excess molar volumes are described by the Redlich-Kister equation. The partial molar volumes of ethylene glycol sharply decrease in the range of high concentrations of tert-butanol. The dependences of partial molar volumes of ethylene glycol are characterized by the presence of a region of temperature inversion. The “negative compressibility” of the limiting partial volumes of ethylene glycol is revealed.

Based on the experimental data, the molar isothermal compressibilities, molar isobaric expansibilities, thermal pressure coefficients, internal pressures of a liquid phase mixture {ethylene glycol (1) + tert-butanol (2)} are calculated for a wide spectrum of compositions in the range of pressures of 0.1–100 MPa and temperatures of 278.15–323.15 K. Shown that the dependences of molar isothermal compressibilities KT, m, molar isobaric expansibilities EP, m, and isochoric thermal pressure coefficients β on the mole fraction of tert-butanol in the mixture are characterized by the absence of extrema typical of aqueous systems. The manifestation of negative partial expansibility and negative partial expansibility of ethylene glycol in the mixture is found. The thermal pressure coefficients decrease with an increase in the mole fraction of tert-butanol at all pressures and temperatures. A rise in the pressure increases the thermal pressure coefficient, while a rise in the temperature decreases its value due to a decrease of free space in the mixture. An increase in the concentration of tert-butanol leads to an increase in the negative temperature coefficient of internal pressure ΔPint/ΔT, which indicates a weakening of intermolecular interaction at these compositions.

Densities of {water (1) + glycerol (2)} binary mixture have been measured with vibrational densimeter over the whole concentration range within the temperature interval 278.15–348.15 K. Excess molar volumes and molar isobaric expansions of the mixture, apparent and partial molar volumes, as well partial molar isobaric expansions of water and glycerol in the mixture, limiting partial molar volumes and limiting partial molar isobaric expansions of water and glycerol have been calculated. It was shown that the mixture densities increased on the glycerol molar fraction rising at every temperature studied, and at low glycerol concentrations this increase was more pronounced. Magnitudes of excess molar volumes of the mixture were negative at all temperatures. But the deviation from ideality decreased with temperature growth. Molar isobaric expansions of the mixture increased almost linearly when glycerol concentration went up. Concentration dependences of partial molar isobaric expansions of water and glycerol were characterized by extremes occurrence.

The reactions of iron diiodide with one and two equivalents of the monopotassium salt of 1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene (dpp-BIAN) in diethyl ether gave the complexes [(dpp-BIAN)FeI]2 (1) and (dpp-BIAN)2Fe (2), respectively. The bis-ligand complex (tms-BIAN)2Fe (3) was synthesized by the exchange reaction of the monosodium salt of 1,2-bis(trimethylsilylimino)acenaphthene (tms-BIAN) with iron diiodide. The reaction of FeI2 with tms-BIAN affords the chelate complex (tms-BIAN)FeI2 (4), whereas the reaction of FeBr2·2H2O with tms-BIAN is accompanied by elimination of trimethylsilyl groups to form the tris-ligand acenaphthene-1,2-diimine complex [(H2BIAN)3Fe][FeBr3·THF]2 (5) containing two types of iron ions. Compounds 1–5 were characterized by IR spectroscopy and elemental analysis. The molecular structures of 1–5 were determined by single-crystal X-ray diffraction. For high-spin complexes 1–3, the temperature-dependent magnetic susceptibilities were measured in the range of 4–300 K.

Molar isothermal compressions, molar isobaric expansions, molar coefficients of thermal pressure, and internal pressures of {water (1) + ethylene glycol (2)} mixture over the whole concentration range, as well as partial molar isothermal compressions and partial isobaric expansions of water in ethylene glycol and of ethylene glycol in water at infinite dilution were calculated at pressures from 0.1 to 100 MPa and at temperatures from 278.15 to 323.15 K. It was revealed that concentration dependences of molar isothermal compressions KT,m, molar isobaric expansions EP,m, and thermal pressure coefficients, β, on ethylene glycol molar fraction had extremes. Temperature and baric dependences of internal pressure of the mixture were almost linear, and coefficients of these dependences at low ethylene glycol concentrations differed from those coefficients for water, ethylene glycol, and their mixtures with high diol content. Analysis of the volume characteristics obtained confirmed both hydrophilic and hydrophobic ethylene glycol nature.

Molar isothermal compressions, molar isobaric expansions, molar coefficients of thermal pressure, and internal pressure were calculated over the whole concentration range of {water (1) + tert -butanol (2)} mixture at pressures from 0.1 to 100 MPa and temperatures from 278.15 to 323.15 K. It was revealed that the extremes, observed on concentration dependences of molar isothermal compression K T , m and molar isobaric expansion E P , m of the mixture, became more pronounced with pressure growth and temperature lowering. Values of molar thermal pressure coefficients of the mixture sharply rose at compositions with small TBA mole fraction and then decreased practically linearly with the alcohol content increasing. Temperature and pressure dependences of the mixture internal pressure were almost linear, and at low TBA concentrations changed significantly from the dependences of water, tert -butanol and their mixtures at large alcohol content.

The coefficient of compressibility, k = ΔV/Vo, of {water (1) + tert-butanol (2)} binary mixture was measured at pressures from 0.1 to 100 MPa and temperatures from 278.15 to 323.15 K over the concentration range of liquid mixture occurrence. The whole composition range from 0 to 1 tert-butanol mole fraction was studied at 323.15 K only because of the mixture freezing at lower temperatures. Over the whole pressure range in question partial molar volumes of the components at all temperatures studied and excess molar volumes of the mixture only at 323.15 K were calculated. It was shown that when pressure increased, the values of excess molar volume decreased, and minimum on concentration dependence of VE on tert-butanol mole fraction shifted to the region of low tert-butanol content. For every pressure studied extremes were observed on the concentration dependences of partial molar volumes of the mixture components. The values of limiting partial molar volumes increased with temperature growth and tended to maximum at pressure slightly higher of 100 MPa.

Hundreds of genetic variants in SCN5A, the gene coding for the pore-forming subunit of the cardiac sodium channel, Na(v) 1.5, have been described in patients with cardiac channelopathies as well as in individuals from control cohorts. The aim of this study was to characterize the biophysical properties of 2 naturally occurring Na(v) 1.5 variants, p.R689H and p.R689C, found in patients with cardiac arrhythmias and in control individuals. In addition, this study was motivated by the finding of the variant p.R689H in a family with sudden cardiac death (SCD) in children. When expressed in HEK293 cells, most of the sodium current (I(Na)) biophysical properties of both variants were indistinguishable from the wild-type (WT) channels. In both cases, however, an ∼2-fold increase of the tetrodotoxin-sensitive late I(Na) was observed. Action potential simulations and reconstruction of pseudo-ECGs demonstrated that such a subtle increase in the late I(Na) may prolong the QT interval in a nonlinear fashion. In conclusion, despite the fact that the causality link between p.R689H and the phenotype of the studied family cannot be demonstrated, this study supports the notion that subtle alterations of Na(v) 1.5 variants may increase the risk for cardiac arrhythmias.

The coefficient of compressibility, k = ΔV/Vo, of {water (1) + ethylene glycol (2)} binary mixture was measured at pressures from 0.1 to 100 MPa and temperatures from 278.15 to 323.15 K over the whole concentration range. At all state parameters the following characteristics were calculated: excess molar volumes of the mixture, V m E ; changes of excess molar Gibbs energy, Δ P o → P G m E ; changes of excess molar entropy, Δ P o → P S m E ; changes of excess molar enthalpy, Δ P o → P H m E ; mixing enthalpy, H m E , of water with ethylene glycol at high pressure, and partial molar volumes of the components. It was shown that the coefficients of compressibility, k, sharply decreased over the concentration interval x2 = 0 –0.2, where x2 was ethylene glycol mole fraction, and further changed insignificantly. It was revealed that excess molar volumes were negative at all temperatures studied and went down with pressure increasing. The dependence of partial molar volumes of the mixture components on ethylene glycol mole fraction passes extreme at all isobars. Limiting partial molar volumes of water and ethylene glycol decrease with pressure growth. The mixture compression leads to its ordering due to new hydrogen bonds formation.

The chemical and phase compositions of the starting titanium-magnetite concentrate and that reduced at t < 1150°C are investigated. The influence of the developed method of reduction on the degree of reduction of iron titanates and the phase distribution of iron and titanium in the reduced ash is investigated.

978-1-5090-3474-1; International audience; In the context of human-robot collaboration, an efficient impact detection is essential for safe operation. Residual-based collision detection relies on the difference between the estimated and actual motor torques. However, in these model-based methods uncertainties affect the residual in the same structural way as a collision does, leading to potential false alarms. This paper proposes to quantify the influence of uncertainties on residual generation methods based on the inverse dynamic model for both rigid and elastic-joint robots. These uncertainties-induced errors are investigated depending on their origin (parameters estimation or numerical differentiation). Boundaries of these errors are determined along a given trajectory and account as the minimum threshold of detectability of a collision. These results are illustrated in simulation.

The transmission of THz electromagnetic waves via a slab of layered superconductor in the presence of dc magnetic field ${H}_{0}$ is theoretically studied. We demonstrate that the external dc field turns the layered superconductor into nonuniform medium with spatially and frequency-dependent dielectric permittivity. Even a relatively weak dc magnetic field, when the superconductor is in the Meissner state, significantly affects the transmittance of the layered superconductor. Moreover, the proper choice of ${H}_{0}$ can provide the perfect transparency of the slab. In addition, the dc magnetic field changes the dependence of the transmittance on the slab thickness, the frequency, and the incident angle of the wave. Thus, it can serve as an effective tool to control the transmissivity of layered superconductors.

In the course of mathematical modeling, correlations have been established between the parameters of the input and output holes of the pneumatic chamber and the speed of its filling and deflation at a preset temperature. Mathematical relationships, which describe the pneumatic chamber filled with air at the preset initial conditions at a certain moment of time, have been obtained. The experimental data match with the theoretical ones with the specified degree of accuracy.

The article describes the experience of treatment of 66 patients with liver abscess. 38 patients were operated using a traditional open method. 28 – minimally invasive technologies under control of ultrasonography. The majority of liver abscess of the right share was localized in 7 th and 8 th segments, the left share – 3d and 4 th . The volume of liquid formations ranged from 1-2 ml to 1.2 l. The liver abscess was, as a rule, secondary. The use of minimally invasive technologies is an effective method of treatment of liver abscess, it allows to significantly reduce the frequency of complications, duration of hospitalization and a quality of patient’s life. Lethal cases were not recorded.

We theoretically study eigenstates of electromagnetic field inside a one-dimensional photonic crystal containing a defect slab of layered superconductor. Basing on the transfer matrix formalism along with the electrodynamics of Josephson plasma, we obtain the dispersion relations describing the THz electromagnetic modes localized on defect. We consider both symmetric and antisymmetric configuration of defect in photonic crystal. The comparison of the dispersion spectra of the localized states for the layered-superconducting defect and the pure insulating defect reveals the features of the studied system. Теоретически исследованы собственные состояния электромагнитного поля в одномерном фотонном кристалле, содержащем дефектную пластину из слоистого сверхпроводника. Основываясь на методе трансфер-матрицы, с использованием электродинамики джозефсоновской плазмы, получены дисперсионные соотношения, описывающие терагерцевые электромагнитные моды, локализованные на дефекте. Рассмотрены симметричная и антисимметричная конфигурации дефекта в фотонном кристалле. Сравнение дисперсионных спектров локализованных состояний для сверхпроводящего и диэлектрического дефектов позволяет выявить особенности изучаемой системы. Теоретично вивчені власні стани електромагнітного поля в одновимірному фотонному кристалі, що містить дефектну пластину з шаруватого надпровідника. Ґрунтуючись на методі трансфер-матриці, з використанням електродинаміки джозефсонівської плазми, отримані дисперсійні співвідношення, які описують терагерцові електромагнітні моди, що локалізовані на дефекті. Розглядаються симетрична і антисиметричну конфігурації дефекту в фотонному кристалі. Порівняння дисперсійних спектрів локалізованих станів для надпровідного і діелектричного дефектів дозволило виявити особливості системи, що досліджується.

Ternary and quaternary Ill-V alloys obtained by metal-organic vapor-phase epitaxy (MOVPE) grow very often with some degree of atomic ordering. Atomic ordering reduces the symmetry of the crystal lattice and thus drastically changes optical properties of the alloy. Moreover, the photoluminescence (PL) emission becomes polarized and its study helps to understand the atomic arrangement within the crystal lattice. In this work we experimentally studied the polarization of the PL emission from different crystallographic planes of several quaternary III-V semiconductor alloys grown on GaAs substrates by MOVPE. We compare the measured PL emission polarization angular patterns with those calculated with a model made for ternary alloys and discuss the limits of application of this model for quaternaries. It is found that the experimentally obtained polarization patterns are consistent with the existence of different ordering crystallographic planes for III- and for V-group atoms. (C) 2015 Elsevier B.V. All rights reserved.

To improve interaction on the phase boundary of polymer composites, we used functional additives, mechanoactivation method, and ultrasound. In the case of the use of serpentine as a modifier of polytetrafluoroethylene (PTFE), the introduction of magnesium nanospinel (NS) as functional additive resulted in the increase of wear resistance of composite in 2500 times. Effect of ultrasonic irradiation on the composites comprising phlogopite was considered. IR data have shown that NS influences the intensification of the tribological processes. In sonicated composites the intensity of the IR spectra of oxidized fragments depends on the content of NS and correlates with the wear resistance. This work was supported by the Ministry of Education and Science of the Russian Federation, state assignment no. 11.512.2014/K.

The quasi-isentropic compressibility of helium and deuterium plasmas at pressures of up to 1500–2000 GPa has been measured using devices with spherical geometry and an X-ray diagnostic complex comprising three betatrons and a multichannel imaging system with electro-optic gamma detectors. A deuterium density of 4.5 g/cm3 and a helium density of 3.8 g/cm3 have been obtained at pressures of 2210 and 1580 GPa, respectively. The internal energy of a deuterium plasma at the indicated pressure is about 1 MJ/cm3, which is about 100 times greater than the specific energy of condensed chemical explosives. Analysis of the obtained data shows that the degree of helium ionization under the achieved plasma compression parameters is about 0.9.

Methane bubble fluxes in gas flares from bottom sediments in Lake Baikal were estimated for the first time using hydroacoustic methods. Earlier work has demonstrated the occurrence of gas seeps both inside and outside of areas where bottom simulating reflectors were identified in seismic profiles. Fluxes ranged from 14 to 216 tons per year, with the flux for the entire area of the central and southern basins ranging from 1,400 to 2,800 tons per year. Comparison with other water bodies showed that fluxes from the most intensive Baikal flares were similar to those in the Norwegian and Okhotsk seas. Gas hydrates decompose at the lower boundary of the gas hydrate stability zone due to sedimentation. Calculation of the amount of methane produced due to sedimentation gave a total of between 2,600 and 14,000 tons per year for the central and southern basins of the lake. Based on rough estimation, the total flux from shallow- and deep-water gas seeps is similar to the amount of methane produced due to sedimentation. This suggests that gas hydrates possibly occupy much more than 10 % of the pore volume near the base of the gas hydrate stability zone, or that there are other reasons for gas hydrate dissociation and bubble flux from these bottom sediments.

Densities of ethylene glycol(1) + tert -butanol(2) mixtures were measured between (278.15–348.15) K at atmospheric pressure over the entire composition range with a vibrating tube densimeter. It was found that specific volume of mixture increases with growth of tert -butanol concentration at all temperatures under study. Excess molar volumes, apparent and partial molar volumes of ethylene glycol and tert -butanol, coefficients of isobaric expansion of mixture and partial molar isobaric expansion of the components were calculated. Excess molar volumes of the mixture are negative at all temperatures, and deviation from ideality is increased with temperature rise. Excess molar volumes were described by Redlich–Kister equation. Partial molar volumes of ethylene glycol decrease sharply at x 2 → 1. Temperature dependence of partial molar volumes of ethylene glycol is characterized by inversion at х 2 ≈ 0.7. The “negative expansion” of limiting partial volumes of ethylene glycol was observed. Coefficients of isobaric expansion of the mixtures increased with rise both of tert -butanol concentration and temperature.

A large clinical material (1693 patients with rheumatic diseases — RD, 2066 operations) was used to develop a three-level medical rehabilitation system using differentiated, including high-technology surgical methods depending on the nosology, RD stage, localization of joint diseases of the upper and lower extremities during adequate drug therapy. A positive result persisting for 1 to 20 years was achieved in 60—92% of cases.

We study transport properties of a single-mode waveguide with rough boundary. As is known, propagating waves in such waveguides are attenuated because of two mechanisms of surface scattering: the amplitude mecha- nism and the square-gradient mechanism. While the former is known since long ago, the latter was recently predicted. In general, they compete with one another and, then, it is difficult to study them individually. Here, by means of appropriate long-range correlations specified by two correlation parameters and embedded in the disordered boundary of the waveguide, we man- age to separate these mechanisms and stop the competition. Specifically, we arrange different intervals of wave numbers in which they manifest themselves alone. This situation allows one to study the different nature of these scattering mechanisms. (© 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

The structure and the electrical and mechanical properties of Al-Mg-0.22 wt % Sc-0.15 wt % Zr alloys with various magnesium contents (0, 1.5, 4.5 wt %) are experimentally studied during the decomposition of the solid solution of scandium and zirconium in the states after solidification from a melt (cast ingots) and after subsequent multicycle equal-channel angular pressing (microcrystalline structure). The dependences of electrical resistivity ρ, microhardness HV, macroelasticity limit σ0, and yield strength σy on the annealing temperature and time are analyzed.

Densities of glycerol (1) + tert-butanol (2) mixtures were measured over the temperature range 293.15 to 348.15 K at atmospheric pressure, over the entire composition range, with a vibrating tube densimeter. Excess molar volumes, apparent and partial molar volumes of glycerol and tert-butanol, thermal isobaric expansivities of the mixture and partial molar expansivities of the components were calculated. The excess molar volumes of the mixtures are negative at all temperatures, and deviations from ideality increase with increasing temperature. Excess molar volumes were fitted to the Redlich–Kister equation. Partial molar volumes of glycerol decrease with increasing tert-butanol concentration. The temperature dependence of the partial molar volumes of glycerol is characterized by an inversion at x2≈0.7. “Negative expansion” of the limiting partial volumes of glycerol was observed.

Spliceosomes remove introns from primary gene transcripts. They assemble de novo on each intron through a series of steps that involve the incorporation of five snRNP particles and multiple non-snRNP proteins. In mammals, all the intermediate complexes have been characterized on one transcript (MINX), with the exception of the very first, complex E. We have purified this complex by two independent procedures using antibodies to either U1-A or PRPF40A proteins, which are known to associate at an early stage of assembly. We demonstrate that the purified complexes are functional in splicing using commitment assays. These complexes contain components expected to be in the E complex and a number of previously unrecognized factors, including survival of motor neurons (SMN) and proteins of the SMN-associated complex. Depletion of the SMN complex proteins from nuclear extracts inhibits formation of the E complex and causes non-productive complexes to accumulate. This suggests that the SMN complex stabilizes the association of U1 and U2 snRNPs with pre-mRNA. In addition, the antibody to PRPF40A precipitated U2 snRNPs from nuclear extracts, indicating that PRPF40A associates with U2 snRNPs.

Hutchinson-Gilford Progeria Syndrome (HGPS) is a severe premature aging syndrome that affects children. These children display characteristics associated with normal aging and die young usually from cardiovascular problems or stroke. Classical HGPS is caused by mutations in the gene encoding the nuclear structural protein lamin A. This mutation leads to a novel version of lamin A that retains a farnesyl group from its processing. This protein is called Progerin and is toxic to cellular function. Pre-lamin A is an immature version of lamin A and also has a farnesylation modification, which is cleaved in the maturation process to create lamin A.

A series of works, dealt with nontrivial nonlinear stationary and nonstationary phenomena accompanying the flow of the transport current through thin pure single-crystal samples of metals at low temperatures, are discussed. The mechanism of the nonlinearity is magnetidynamical and related with an effect of the intrinsic magnetic field of the current on electron trajectories and, thus, on metal conductivity. The magnetodynamic nonlinearity leads to the nontrivial effect of drop of the resistance in thin samples with increasing the current. At high currents when a radius of curvature of electron trajectories in the intrinsic field of the current becomes smaller than cross sectional dimensions the effect of pinching of the current appears (pinch effect). In this case with increasing the current, the drop of the resistance is replaced by its increase. Experimental investigations of nonlinear current-voltage characteristics of thin cadmium and tungsten samples are also discussed. In these experiments, not only...

The densities of {water (1) + tert-butanol (2)} binary mixture were measured over the temperature range (274.15 to 348.15) K at atmospheric pressure using “Anton Paar” digital vibrating-tube densimeter. Density measurements were carried out over the whole concentration range at (308.15 to 348.15) K. The following volume parameters were calculated: excess molar volumes and thermal isobaric expansivities of the mixture, partial molar volumes and partial molar thermal isobaric expansivities of the components. Concentration dependences of excess molar volumes were fitted with Redlich–Kister equation. The results of partial molar volume calculations using four equations were compared. It was established that for low alcohol concentrations at T ⩽ 208 K the inflection points at x2 ≈ 0.02 were observed at concentration dependences of specific volume. The concentration dependences of partial molar volumes of both water and tert-butanol had extremes at low alcohol content. The temperature dependence of partial molar volumes of water had some inversion at х2 ≈ 0.65. The temperature dependence of partial molar volumes of tert-butanol at infinite dilution had minimum at ≈288 K. It was discovered that concentration dependences of thermal isobaric expansivities of the mixture at small alcohol content and low temperatures passed through minimum.

Compressibility coefficients k were measured for binary ethylene glycol (EG)-dimethyl sulfoxide (DMSO) mixtures over the whole composition range at pressures of 0.1–100 MPa and temperature 308.15 K. Excess molar volumes of mixtures, partial molar volumes of EG and DMSO, and changes in the excess molar Gibbs energy were calculated. The concentration dependences of compressibility factors k passed a minimum at pressures of ∼10 MPa. The k coefficient increased as the pressure grew, and the dependence became linear. The composition dependences of the specific volumes of mixtures passed minima at x ∼ 0.5 as the pressure increased (x is the mole fraction of dimethyl sulfoxide). The excess molar volumes were negative (EG-DMSO mixtures formed with compression). Changes in the excess molar Gibbs energy characterized the stabilizing action of pressure on the EG-DMSO system.

734 Industries that rely on the packing and transporta� tion of freeflowing materials include metallurgy, con� struction, agriculture, food production, and the petro� chemical complex. In the delivery of freeflowing products from the producer to the consumer, they must be packaged, most often in soft modules, such as flexible containers, big bags, and elastic film. Flexible containers (sacks) are most common; their size (gen� erally no more than 5-50 kg) is limited by human car� rying capacity. They consist of a sleevelike body, a sewn or glued bottom, and a mouth. A system of hinged levers provides the basis for automatic manipulation of the flexible container as it is filled. Existing systems contain capture elements in the form of pins, moved by one or more pneumatic cylinders (1-3). These automatic manipulation devices can grab a flexible container lying in a heap

The thermodynamic properties of a highly compressed deuterium plasma have been measured using an explosive spherical experimental chamber. The experiment has been performed with an X-ray diffraction complex consisting of three betatrons and a multichannel optoelectronic system of the detection of X-ray images of the process of the explosive spherical compression of deuterium. The density of the shock-compressed deuterium plasma ρ = (4.3 ± 0.7) g/cm3 at the pressure P = 1830 GPa has been detected at the initial pressure of gaseous deuterium P 0 = 267 atm and the temperature T 0 = 10.5°C. Under such conditions, the plasma is strongly nonideal (Γ ∼ 450) with the degenerate (nλ 3 ∼ 280) electron component and with an electron density of about 2.8 × 1023 cm−3.

Densities, ρ, and compressibility coefficients, k = (vo − v)/vo, of ethylene glycol (1) + dimethylsulfoxide (2) mixtures were measured over the whole concentration range at pressures of (0.1 to 100) MPa and temperatures of (278.15 to 323.15) K. Excess molar volumes, isothermal compressibility, and thermal isobaric expansivity coefficients as well as thermal pressure coefficients were calculated. It was revealed that concentration dependences of specific volumes, v, at some state parameters passed a minimum. The shift of minimum position to molar fraction x2 = 0.5 was observed with increasing pressure and decreasing temperature. The negative excess molar volumes, VmE, indicated a compression of EG (1) + DMSO (2) systems when mixing. Composition dependences of isothermal compressibility, κT, and thermal isobaric expansivity coefficients, α, as well as thermal pressure coefficients, β, were near-linear. Both increasing and decreasing of κT and β values were observed with x2 increase depending on temperature ...

Density of the water-ethylene glycol binary mixtures was measured in the entire range of compositions in the temperature range 278–333.15 K (6 values) at atmospheric pressure using a vibration densimeter. Mixtures with low concentrations of ethylene glycol were studied at 15 temperatures in the range of 274–333.15 K. Excess molar volumes VmE, the partial molar volumes of water -V1 and ethylene glycol, -V2, the coefficients of thermal volume expansion α of the mixture, the partial molar volume coefficients of thermal expansion of water \( \bar V_1 \) and ethylene \( \bar V_2 \) were calculated. Excess molar volumes were described using the Redlich-Kister equation. The density ρ of the mixture was found to increase with the increasing ethylene glycol concentration at all temperatures, but at low content of ethylene glycol the dependence ρ = f(T) of the mixture at ∼276.5 K passed through a maximum. The coefficient α increases sharply in the composition range 0 277 K is positive for all compositions. The dependences \( \bar \alpha _1 \) = f (x) and \( \bar \alpha _2 \) = f (x) are complex in whole temperature range and are characterized by the presence of an extremum. VmE values are negative at all temperatures, and upon increase in the temperature the deviation from ideality decreases (x is the mole fraction of ethylene glycol).

Using the experimental data on the densities at atmospheric pressure and compressibility coefficients, k=(Vo-V)/Vo, of water + FA mixture the changes in the following thermodynamic parameters were calculated under the pressure increase up to 100 MPa within the temperature range from 288.15 to 323.15 K: excess molar Gibbs energy, ΔPo→PGmE, excess molar entropy ,ΔPo→PSmE, and excess molar entropy ΔPo→PHmE. It was established that ΔPo→PGmEvalues were negative over the whole concentration range and minima appeared on ΔPo→PGmE= f(x2) functions at x2≈0.33. The pressure growth up to 100 MPa resulted in ΔPo→PGmE absolute values increase within entire concentration and temperature intervals. The changes in entropy component, -(ΔPo→PTSmE), of ΔPo→PGmEvalues were almost canceled by the enthalpy component changes. Minimal values of ΔPo→PSmE corresponded to x2≈ 0.33, exactly at that composition 2Н2О-FA associate formed. The isobaric temperature lowering caused the structure ordering also at x2≈ 0.33. The pressure growth promoted the increasing in exothermicity of the mixing enthalpies, HmE, of water and formamide. The changes in HmE value under the mixture compression are indicative of the larger exothermal contribution from new H-bonds formation as compared with the endothermic contribution from the decreasing in the total amount of hydrogen bonds. The temperature lowering decreases ΔPo→PHmEvalues as well; maximal isotherms dispersion is observed at concentrations corresponding to maximal content of 2:1 or 1:1 associates of water and FA.

The method for recycling of rubber of different composition in granular state by introducing them into the polymerization medium at the synthesis of butadiene-styrene rubber was considerd. It was shown that rubber made on basis of such rubber, exhibits better physical and mechanical properties than at introducing grinded vulcanizate at producing these mixtures on rolls as well as through rubbers thermomechanical regeneration.

The variations of excessmolarthermodynamic characteristics: Gibbs energyΔP0→PGmE, entropy ΔP0→PSmE and enthalpy ΔP0→PHmE forthe mixture of water +ethylenediamine in the temperature range of 288.15-323.15K and pressures increase up to 100 MPa were calculated. Concentration dependences ofΔP0→PGmE, ΔP0→PSmE иΔP0→PHmE versus mole fractionof ethylenediamine (x2) at all values ofpressure studied were characterized by the presenceof maxima. A correlation of the mixture melting diagramand change in excess molar entropy from concentration (D Po→pSmE=f(x2))was found.

The localization length has been derived for one-dimensional bi-layered structures with random perturbations in the refractive indices for each type of layers. Main attention is paid to the comparison between conventional materials and those consisting of mixed right-hand and left-hand materials. It is shown that the localization length is described by the universal expression for both cases. The analytical results are confirmed by numerical simulations., 4 pages, 2 figures; new figures and discussion, slightly corrected abstract

The resonant quantization of Landau damping in far-infrared absorption spectra of metal nano-thin films is predicted within the Kubo formalism. Specifically, it is found that the discretization of the electromagnetic and electron wave numbers inside a metal nanoslab produces quantum nonlocal resonances well-resolved at slab thicknesses smaller than the electromagnetic skin depth. Landau damping manifests itself precisely as such resonances, tracing the spectral curve obtained within the semiclassical Boltzmann approach. For slab thicknesses much greater than the skin depth, the classical regime emerges. Here the results of the quantum model and the Boltzmann approach coincide. Our analytical study is in perfect agreement with corresponding numerical simulations.