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Article
Open AccessTerahertz Third-Harmonic Generation in Topological Insulators Based on Bismuth and Antimony Chalcogenides
Terahertz third-harmonic generation in topological insulators based on bismuth and antimony chalcogenides has been experimentally investigated. It has been found that the third-harmonic conversion efficiency i...
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Article
Bioavailability of the Tablet Dosage Form of a Benzimidazole Derivative Possessing Antiplatelet Activity
The bioavailability of the tablet dosage form of pharmaceutical substance RU-891, i.e., 9-(3,4-dihydroxyphenacyl)-2,3-dihydroimidazo[1,2-a]benzimidazole hydrobromide, was investigated. The main pharmacokinetic pa...
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Article
Direct Measurement of the Correlation Function of Optical–Terahertz Biphotons
The second-order correlation function which characterizes the quantum correlation between the optical and terahertz photons generated under spontaneous parametric down-conversion has been measured for the firs...
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Article
Open AccessTerahertz signatures of ultrafast Dirac fermion relaxation at the surface of topological insulators
Topologically protected surface states present rich physics and promising spintronic, optoelectronic, and photonic applications that require a proper understanding of their ultrafast carrier dynamics. Here, we...
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Article
Bioequivalence of RU-31 Tablet Dosage Form
The bioequivalence of the tablet dosage form of RU-31 substance was studied. The main pharmacokinetic parameters were determined. The actual relative bioequivalence index was calculated and turned out to be ~1...
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Article
Development of a Quantitative Determination Method for a Benzimidazole Derivative with Laboratory Code RU-31 and Antimigraine Activity in Biological Samples
A quantitative determination method for drug substance RU-31, a derivative of a methoxyphenylimidazo - [1,2-α]benzimidazole possessing antimigraine activity, in biological samples was developed. This method ha...
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Article
Quantitative Determination of Rutin in Biological Samples of Rats Upon Administration of Primula veris L. Herbal Dense Extract
Rutin contents in biological samples of blood plasma, cardiomyocytes, and mitochondria of cardiomyocytes in rats after administration of Primula veris L. dense herbal extract were determined using a quantitative ...
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Article
Generation of Optical—Terahertz Biphotons and Detection of Their Terahertz Component under Frequency-Nondegenerate Parametric Down-Conversion
The conditions for the generation and detection of quantum-correlated pairs of optical and terahertz photons in the process of strongly frequency-nondegenerate parametric down-conversion of light are investiga...
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Article
Method Development for Quantitative Determination of the Gaba Derivative Solifen
An HPLC method for quantitative determination of the new biologically active GABA derivative Solifen was developed. The method sensitivity, compound retention time and UV absorption maximum were determined. Th...
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Article
Quantitative Determination of Ivabradine and Its N-Demethylated Metabolite in Volunteer Blood and Urine
An HPLC method was developed for quantitative determination and pharmacokinetic analysis of ivabradine and its N-demethylated metabolite using the new internal standard domperidone. The method is highly sensit...
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Article
Quantitative HPLC Determination of γ-Aminobutyric Acid Derivative Mefebut in Bioassays
A quantitative HPLC method was developed for analyzing mefebut in pharmacokinetic studies. The method was highly sensitive and selective and could be used for determinations in bioassays. The optimized sample-...
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Article
Bioequivalence of a Dosage form of the New Drug Mefebut
The bioequivalence of mefebut drug substance and its tablet dosage form was investigated by studying the main pharmacokinetic parameters and calculating the relative bioavailability. The results showed that me...
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Article
Terahertz-radiation generation in low-temperature InGaAs epitaxial films on (100) and (411) InP substrates
The spectrum and waveforms of broadband terahertz-radiation pulses generated by low-temperature In0.53Ga0.47As epitaxial films under femtosecond laser pum** are investigated by terahertz time-resolved spectrosc...
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Article
Photoinduced gratings in a Sn2P2S6 ferroelectric crystal with the period depending on the optical pump power
The light scattering in the form of ring structures in Sn2P2S6 crystals at the propagation of intense laser pump radiation along the b crystallographic axis is detected. Radiation passing through a crystal is com...
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Article
Complex extraordinary dielectric function of Mg-doped lithium niobate crystals at terahertz frequencies
We study the dispersion of the extraordinary dielectric function real and imaginary parts in the wide terahertz-frequency range of the lowest polariton branch for bulk LiNbO3 and Mg:LiNbO3 crystals. At frequencie...
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Article
Relationship Between Impact Strength and Stress Intensity Factor K 1c for Steels Used in Manufacturing Petrochemical Equipment
The dependence of fracture toughness (stress intensity factor K1c) for steels on their mechanical properties (yield strength and impact energy) taking account of the effect of temperature is considered. The natur...
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Article
Methods, models, and means of efficiency improvement in the estimation of the technical condition and residual service life of technical devices
In order to improve the efficiency and quality of estimation of the technical condition and residual service life of technical devices, a special approach has been devised, based on informational support and t...
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Article
Pharmacokinetic Properties of a New Glutamic Acid Derivative Glutaron
Inhomogenous distribution of glutaron in organs and tissues was found after intravenous and peroral administration: the agent demonstrated high affi nity to organs with high degree of vascularization (lungs an...
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Article
Support of Decision-Making Based on a Production Approach in the Performance of an Industrial Safety Review
It is shown that production-based expert systems may be used to support decision-making in the performance of an industrial safety review, in particular, in solving problems related to compilation of a technic...
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Article
Non-collinear generation of the second optical harmonic in strontium-barium niobate crystals with needle-like microdomains
The structure of the spatial spectra from the second harmonic (SH) of yttrium-aluminum-garnet neodymium laser radiation during quasi-phase-matched generation is studied in a spatially inhomogeneous nonlinear m...
