Subjects -> EARTH SCIENCES (Total: 771 journals)
    - EARTH SCIENCES (527 journals)
    - GEOLOGY (94 journals)
    - GEOPHYSICS (33 journals)
    - HYDROLOGY (29 journals)
    - OCEANOGRAPHY (88 journals)

EARTH SCIENCES (527 journals)            First | 1 2 3     

Showing 201 - 371 of 371 Journals sorted alphabetically
Hydrological Processes     Hybrid Journal   (Followers: 44)
Hydrology and Earth System Sciences     Open Access   (Followers: 38)
ICES Journal of Marine Science: Journal du Conseil     Hybrid Journal   (Followers: 53)
IEEE Geoscience and Remote Sensing Letters     Hybrid Journal   (Followers: 149)
IEEE Geoscience and Remote Sensing Magazine     Hybrid Journal   (Followers: 6)
IEEE Journal of Oceanic Engineering     Hybrid Journal   (Followers: 11)
Indian Geotechnical Journal     Hybrid Journal   (Followers: 4)
Indonesian Journal on Geoscience     Open Access   (Followers: 1)
Inland Waters     Hybrid Journal  
Innovative Infrastructure Solutions     Hybrid Journal  
Interdisciplinary Environmental Review     Hybrid Journal   (Followers: 3)
International Geology Review     Hybrid Journal   (Followers: 17)
International Journal of Advanced Geosciences     Open Access   (Followers: 2)
International Journal of Advanced Remote Sensing and GIS     Open Access   (Followers: 50)
International Journal of Applied Earth Observation and Geoinformation     Open Access   (Followers: 36)
International Journal of Coal Geology     Hybrid Journal   (Followers: 2)
International Journal of Disaster Risk Reduction     Hybrid Journal   (Followers: 18)
International Journal of Earth Sciences     Hybrid Journal   (Followers: 37)
International Journal of Earthquake and Impact Engineering     Hybrid Journal   (Followers: 4)
International Journal of Energetic Materials     Full-text available via subscription  
International Journal of Environment and Geoinformatics     Open Access   (Followers: 4)
International Journal of Geo-Engineering     Open Access   (Followers: 2)
International Journal of Geographical Information Science     Hybrid Journal   (Followers: 55)
International Journal of Geomechanics     Full-text available via subscription   (Followers: 6)
International Journal of Geosciences     Open Access   (Followers: 10)
International Journal of Geosynthetics and Ground Engineering     Full-text available via subscription   (Followers: 3)
International Journal of Geotechnical Earthquake Engineering     Full-text available via subscription   (Followers: 9)
International Journal of Image and Data Fusion     Hybrid Journal   (Followers: 3)
International Journal of Remote Sensing     Hybrid Journal   (Followers: 144)
International Journal of Remote Sensing Applications     Open Access   (Followers: 49)
International Journal of Soil, Sediment and Water     Open Access   (Followers: 4)
International Journal of Speleology     Open Access   (Followers: 3)
Iraqi National Journal of Earth Sciences     Open Access  
iScience     Open Access   (Followers: 1)
Island Arc     Hybrid Journal   (Followers: 5)
ISPRS International Journal of Geo-Information     Open Access   (Followers: 5)
Italian Journal of Geosciences     Open Access  
Izvestiya, Atmospheric and Oceanic Physics     Full-text available via subscription   (Followers: 1)
Izvestiya, Physics of the Solid Earth     Hybrid Journal   (Followers: 2)
Jahresberichte und Mitteilungen des Oberrheinischen Geologischen Vereins     Full-text available via subscription   (Followers: 3)
JETP Letters     Hybrid Journal   (Followers: 3)
Journal of Earth Science & Climatic Change     Open Access   (Followers: 14)
Journal of Advances in Modeling Earth Systems     Open Access   (Followers: 5)
Journal of African Earth Sciences     Hybrid Journal   (Followers: 11)
Journal of Analytical and Numerical Methods in Mining Engineering     Open Access  
Journal of Applied Geophysics     Hybrid Journal   (Followers: 15)
Journal of Applied Volcanology     Open Access   (Followers: 7)
Journal of Arid Land     Hybrid Journal  
Journal of Asian Earth Sciences     Hybrid Journal   (Followers: 15)
Journal of Asian Earth Sciences : X     Open Access  
Journal of Atmospheric and Oceanic Technology     Hybrid Journal   (Followers: 33)
Journal of Atmospheric and Solar-Terrestrial Physics     Hybrid Journal   (Followers: 133)
Journal of Big History     Open Access   (Followers: 3)
Journal of Coastal Conservation     Hybrid Journal   (Followers: 6)
Journal of Coastal Research     Hybrid Journal   (Followers: 31)
Journal of Contemporary Physics (Armenian Academy of Sciences)     Hybrid Journal   (Followers: 9)
Journal of Contemporary Water Resource & Education     Hybrid Journal   (Followers: 2)
Journal of Earth Science     Hybrid Journal   (Followers: 12)
Journal of Earth System Science     Open Access   (Followers: 52)
Journal of Earth, Environment and Health Sciences     Open Access   (Followers: 2)
Journal of Earthquake and Tsunami     Hybrid Journal   (Followers: 2)
Journal of Earthquake Engineering     Hybrid Journal   (Followers: 14)
Journal of Environment and Earth Science     Open Access   (Followers: 11)
Journal of Environmental & Engineering Geophysics     Hybrid Journal   (Followers: 2)
Journal of Geodesy     Hybrid Journal   (Followers: 9)
Journal of Geodesy and Geoinformation     Open Access   (Followers: 2)
Journal of Geodynamics     Hybrid Journal   (Followers: 6)
Journal of Geography, Environment and Earth Science International     Open Access  
Journal of Geology     Full-text available via subscription   (Followers: 30)
Journal of Geomorphology     Open Access   (Followers: 3)
Journal of Geophysical Research : Atmospheres     Partially Free   (Followers: 133)
Journal of Geophysical Research : Biogeosciences     Full-text available via subscription   (Followers: 34)
Journal of Geophysical Research : Earth Surface     Partially Free   (Followers: 59)
Journal of Geophysical Research : Oceans     Partially Free   (Followers: 60)
Journal of Geophysical Research : Planets     Full-text available via subscription   (Followers: 115)
Journal of Geophysical Research : Solid Earth     Full-text available via subscription   (Followers: 56)
Journal of Geophysical Research : Space Physics     Full-text available via subscription   (Followers: 134)
Journal of Geophysics and Engineering     Hybrid Journal   (Followers: 2)
Journal of Geoscience Education     Hybrid Journal   (Followers: 1)
Journal of Geoscience, Engineering, Environment, and Technology     Open Access   (Followers: 1)
Journal of Geosciences     Open Access   (Followers: 5)
Journal of Geosciences and Geomatics     Open Access   (Followers: 1)
Journal of Geospatial Applications in Natural Resources     Open Access  
Journal of Geotechnical and Geoenvironmental Engineering     Full-text available via subscription   (Followers: 30)
Journal of Geotechnical Engineering     Full-text available via subscription   (Followers: 4)
Journal of Great Lakes Research     Hybrid Journal   (Followers: 5)
Journal of Hydro-environment Research     Full-text available via subscription   (Followers: 13)
Journal of Hydrologic Engineering     Full-text available via subscription   (Followers: 40)
Journal of International Maritime Safety, Environmental Affairs, and Shipping     Open Access   (Followers: 1)
Journal of Life and Earth Science     Open Access  
Journal of Marine Medical Society     Open Access   (Followers: 1)
Journal of Marine Research     Full-text available via subscription   (Followers: 20)
Journal of Marine Science and Technology     Hybrid Journal   (Followers: 3)
Journal of Marine Systems     Hybrid Journal   (Followers: 9)
Journal of Metamorphic Geology     Hybrid Journal   (Followers: 15)
Journal of Mining Science     Hybrid Journal   (Followers: 2)
Journal of Mountain Science     Hybrid Journal  
Journal of Natural Gas Geoscience     Open Access  
Journal of Ocean and Climate     Open Access   (Followers: 9)
Journal of Oceanology and Limnology     Hybrid Journal   (Followers: 3)
Journal of Petroleum Exploration and Production Technology     Open Access   (Followers: 2)
Journal of Petroleum Science and Engineering     Hybrid Journal   (Followers: 3)
Journal of Petrology     Hybrid Journal   (Followers: 11)
Journal of Plasma Physics     Hybrid Journal   (Followers: 21)
Journal of Population and Sustainability     Open Access  
Journal of Quaternary Science     Hybrid Journal   (Followers: 31)
Journal of Rock Mechanics and Geotechnical Engineering     Open Access   (Followers: 3)
Journal of Sea Research     Hybrid Journal   (Followers: 6)
Journal of Sedimentary Environments     Open Access  
Journal of Seismology     Hybrid Journal   (Followers: 9)
Journal of Spatial Information Science     Open Access   (Followers: 4)
Journal of Structural Geology     Hybrid Journal   (Followers: 26)
Journal of Systematic Palaeontology     Hybrid Journal   (Followers: 7)
Journal of the Atmospheric Sciences     Hybrid Journal   (Followers: 83)
Journal of the Geological Society     Hybrid Journal   (Followers: 17)
Journal of the Royal Society of New Zealand     Hybrid Journal   (Followers: 48)
Journal of the World Aquaculture Society     Hybrid Journal   (Followers: 13)
Journal of Volcanology and Geothermal Research     Hybrid Journal   (Followers: 17)
Journal of Water and Climate Change     Open Access   (Followers: 52)
Journal on Geoinformatics, Nepal     Open Access   (Followers: 1)
Jurnal Ilmiah Perikanan dan Kelautan / Scientific Journal of Fisheries and Marine     Open Access  
Kartografija i geoinformacije (Cartography and Geoinformation)     Open Access  
Lake and Reservoir Management     Hybrid Journal   (Followers: 7)
Landslides     Hybrid Journal   (Followers: 26)
Latin American Journal of Sedimentology and Basin Analysis     Open Access   (Followers: 1)
Lethaia     Hybrid Journal   (Followers: 5)
Letters in Mathematical Physics     Hybrid Journal   (Followers: 4)
Limnologica     Hybrid Journal   (Followers: 4)
Limnology     Hybrid Journal   (Followers: 9)
Lithology and Mineral Resources     Hybrid Journal   (Followers: 3)
Lithos     Hybrid Journal   (Followers: 9)
Malaysian Journal of Geosciences     Open Access  
Marine and Freshwater Research     Hybrid Journal   (Followers: 6)
Marine and Petroleum Geology     Hybrid Journal   (Followers: 21)
Marine Biology Research: New for 2005     Hybrid Journal   (Followers: 2)
Marine Economics and Management     Open Access   (Followers: 3)
Marine Environmental Research     Hybrid Journal   (Followers: 31)
Marine Geodesy     Hybrid Journal   (Followers: 4)
Marine Geology     Hybrid Journal   (Followers: 31)
Marine Geophysical Researches     Hybrid Journal   (Followers: 5)
Marine Georesources & Geotechnology     Hybrid Journal  
Marine Mammal Science     Hybrid Journal   (Followers: 10)
Marine Policy     Hybrid Journal   (Followers: 60)
Mathematical Geosciences     Hybrid Journal   (Followers: 4)
Mathematical Physics, Analysis and Geometry     Hybrid Journal   (Followers: 3)
Mediterranean Geoscience Reviews     Hybrid Journal  
Meteoritics & Planetary Science     Hybrid Journal   (Followers: 18)
Meteorologische Zeitschrift     Full-text available via subscription   (Followers: 4)
Mineralium Deposita     Hybrid Journal   (Followers: 4)
Mineralogia     Open Access   (Followers: 2)
Mineralogy and Petrology     Hybrid Journal   (Followers: 2)
Mineria y Geologia     Open Access  
Mining, Metallurgy & Exploration     Hybrid Journal  
Momona Ethiopian Journal of Science     Open Access   (Followers: 5)
Mongolian Geoscientist     Open Access  
Moscow University Geology Bulletin     Hybrid Journal  
Moscow University Physics Bulletin     Hybrid Journal  
Natural Hazards     Hybrid Journal   (Followers: 53)
Natural Hazards and Earth System Sciences (NHESS)     Open Access   (Followers: 10)
Natural Hazards and Earth System Sciences Discssions     Open Access  
Natural Hazards Research     Open Access  
Natural Hazards Review     Full-text available via subscription   (Followers: 16)
Natural Resources & Engineering     Hybrid Journal  
Natural Resources Research     Hybrid Journal   (Followers: 8)
Nature Geoscience     Full-text available via subscription   (Followers: 161)
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen     Full-text available via subscription   (Followers: 3)
Neues Jahrbuch für Mineralogie - Abhandlungen     Full-text available via subscription   (Followers: 1)
Newsletters on Stratigraphy     Full-text available via subscription   (Followers: 2)
Nonlinear Processes in Geophysics (NPG)     Open Access  
Nonlinear Processes in Geophysics Discussions     Open Access  
Ocean & Coastal Management     Hybrid Journal   (Followers: 62)
Ocean Development & International Law     Hybrid Journal   (Followers: 15)
Ocean Dynamics     Hybrid Journal   (Followers: 6)
Ocean Engineering     Hybrid Journal   (Followers: 6)
Ocean Modelling     Hybrid Journal   (Followers: 12)
Ocean Science (OS)     Open Access   (Followers: 7)
Ocean Science Journal     Hybrid Journal   (Followers: 6)
Open Geospatial Data, Software and Standards     Open Access   (Followers: 3)
Open Journal of Earthquake Research     Open Access   (Followers: 3)
Open Journal of Soil Science     Open Access   (Followers: 9)
Ore and Energy Resource Geology     Open Access  
Ore Geology Reviews     Hybrid Journal   (Followers: 11)
Organic Geochemistry     Hybrid Journal   (Followers: 4)
Osterreichische Wasser- und Abfallwirtschaft     Hybrid Journal  
Paläontologische Zeitschrift     Hybrid Journal   (Followers: 4)
Papers in Palaeontology     Hybrid Journal  
Permafrost and Periglacial Processes     Hybrid Journal   (Followers: 5)
Perspectives of Earth and Space Scientists i     Open Access   (Followers: 1)
Petroleum Geoscience     Hybrid Journal   (Followers: 5)
Petroleum Science     Open Access  
Petrology     Full-text available via subscription   (Followers: 6)
PFG : Journal of Photogrammetry, Remote Sensing and Geoinformation Science     Hybrid Journal   (Followers: 4)
Photogrammetrie - Fernerkundung - Geoinformation     Full-text available via subscription  
Physical Geography     Hybrid Journal   (Followers: 8)
Physical Science International Journal     Open Access  
Physics of Life Reviews     Hybrid Journal   (Followers: 1)
Physics of Metals and Metallography     Hybrid Journal   (Followers: 18)
Physics of Plasmas     Hybrid Journal   (Followers: 10)
Physics of the Earth and Planetary Interiors     Hybrid Journal   (Followers: 34)
Physics of the Solid State     Hybrid Journal   (Followers: 7)

  First | 1 2 3     

Similar Journals
Journal Cover
Journal of Contemporary Physics (Armenian Academy of Sciences)
Journal Prestige (SJR): 0.229
Number of Followers: 9  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1934-9378 - ISSN (Online) 1068-3372
Published by Springer-Verlag Homepage  [2469 journals]
  • Electrode Material for Supercapacitors Based on Products of Solid Phase
           Pyrolysis of Metal-Phthalocyanines

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      Abstract: Ni@C nanocomposites in a graphite-like carbon matrix and cobalt nanoparticles in carbon nanotubes were obtained by solid-phase pyrolysis of nickel phthalocyanine (NiC32N8H16) and cobalt phthalocyanine (CoC32N8H16). The metal concentrations in the carbon matrix in both cases in Ni/C and Co/C are the same—12 wt %. The structure and morphology of the obtained samples were studied by high-resolution scanning and transmission electron microscopy as well as X-ray diffraction. The capacitive and resistive characteristics of the obtained Ni/C and Co/C compounds as an electrode material for supercapacitors (SC) have been investigated. The specific capacitances measured by cyclic voltammetry are 12 F/g and 8 F/g for Ni/C and Co/C samples, respectively. The synthesized compounds can become a promising electrode material for super capacitors with an electrolyte solution of H2SO4.
      PubDate: 2022-03-01
       
  • Fraunhofer Diffraction by a Slit into a Homogeneous Anisotropic Medium

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      Abstract: Fraunhofer diffraction of light by a slit on an opaque screen located between a vacuum and a homogeneous anisotropic medium in the absence and in the presence of absorption at different orientations of the optical axis of the medium relative to the slit is considered. The well-known formula for the diffraction in a vacuum is generalized, with the inclusion of the case of diffraction into a uniaxial anisotropic medium in the absence of absorption. A formula is obtained that makes it possible to determine the directions of the diffraction minima and maxima taking into account this absorption.
      PubDate: 2022-03-01
       
  • Thermodynamics of Physical Approximations to Non Deterministic Polynomial
           Complete Problems

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      Abstract: Non deterministic polynomial complete problems are playing an essential role in nowadays communications, security and many other fields. One of the well-known NP-complete problems is the Examination Timetabling problem. Given the information about the courses and the students that have taken some of those courses as well as the time slots for the exams of those courses the problem asks if there is a timetable such that no student has two exams simultaneously. We are modeling this NP-complete problem as a system of particles with one dimensional motion. After adding some interactions between the particles based on the problem we are simulating the motion and arriving to an equilibrium. We then use the equilibrium state to group the particles together where each cluster represents a time slot. To discuss the physics of this model we use the Replica method to find the free energy functional of this system. A hypothesis is formulated that all or at least most numerical solutions for NP-complete problems can be brought to this model with some configuration of interactions between the particles.
      PubDate: 2022-03-01
       
  • Registration of Brain Radio Signals and Their Bispectral Analysis

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      Abstract: Using the probe antenna of the applicator, radio frequency signals (RFS) of the human brain are recorded. A method for digital processing of recorded RFS in the LabVIEW environment using spectral and bispectral analysis is proposed. As a result of spectral analysis, it was revealed that the human brain emits RFR in the megaHertz range, and as evidenced by the results of bispectral analysis, some groups of spectral components of RFR of the brain exhibit an internal correlation. The results of these studies can be useful for identifying fast processes in the human brain, for understanding the nature of these processes, and, as a result, for the diagnosis and treatment of various human diseases associated with the brain.
      PubDate: 2022-03-01
       
  • Superconductor-Insulator Transition in Ultra-Thin Sb2Te3 Nanoplates

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      Abstract: The conductivity of single-crystal nanoplates of the Sb2Te3 topological insulator has been investigated. A sharp drop in resistance occurs in ultrathin Sb2Te3 nanoplates at a temperature of about 4 K, which is a manifestation of superconductivity. The results show that the presence of an optimal degree of disorder is a necessary condition for the onset of superconductivity. A superconductor-insulator transition, tunable by a magnetic field, is observed in these nanoplates. The temperature dependence of the magnetoresistance in fields below the critical value (B < BC) shows a successive transformation of a weak antilocalization anomaly into a superconducting transition. The value of the correlation length exponent ν = 0.75 ± 0.05 was obtained using the scaling theory.
      PubDate: 2022-03-01
       
  • Dynamics of Charged Complex Molecules in Aqueous Solution

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      Abstract: The results of theoretical modeling of the dynamics of a charged large molecule in an aqueous solution under the influence of gravity, vertical electric field, and drag force are presented. Computations were carried out for the DNA molecule. It is shown that one can smoothly control the speed of movement of a molecule by an electric field so that it is possible to carry out accurate sequencing by the tunneling current method. It was also shown that the speed of movement of a molecule can be reduced to some decimal cm/s, which is equivalent to sequencing 105–106 nucleoids per second.
      PubDate: 2022-03-01
       
  • Gas- and Biosensors Made from Metal Oxides Doped with Carbon Nanotubes

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      Abstract: Single wall version of carbon nanotubes (SWCNTs) is promising for the detection of many important gases including gases exhaled by the organism. Properties of such CNT-noble metal sensors, detectors of gases exhaled by the organism, biosensors and other applications of CNT sensors in medicine are reported. Very promising is the realization of gas sensors based on metal oxides (especially SnO2) doped with CNTs. VOC sensors based on ruthenate multi-walled carbon nanotubes coated with tin-dioxide nanoparticles (MWCNTs/SnO2) nanocomposite structures were prepared and investigated in Yerevan State University (YSU) using three methods. The optimal conditions, operating temperature and the mass ratio of the components are established for the manufacturing of acetone and toluene as well as ethanol and methanol vapors detectors. The results of research works related to the study of MWCNT-SnO2 nanocomposite sensors of propylene glycol (PG), dimethylformamide (DMF) and formaldehyde (FA) vapors are also presented in this paper. The dependence of the sensor response on gas concentration is linear.
      PubDate: 2022-03-01
       
  • Methodological Research to Improve the Extraction of Near-Threshold
           Quasi-Real Photoproduction of J/Ψ-Meson Process on Nucleons from
           Experimental Data of Electroproduction on Hydrogen Nuclei, Obtained by
           CLAS12 Setup

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      Abstract: This work describes the methodological part of the analysis on the study of the near-threshold quasi-real photoproduction of vector mesons on nucleons. The analysis uses experimental data obtained at the CLAS12 (Cebaf Large Acceptance Spectrometer) of the CEBAF (Current Beam Accelerator Facility) of the Jefferson Laboratory (USA). The experimental data on the scattering of 10.6 GeV electrons by a liquid hydrogen target is investigated. The work describes methods for the selection and identification of the final states of completely exclusive near-threshold reactions of (Eγ ≥ 8.2 GeV) quasi-real (Q2 ≈ 0) photoproduction of J/ѱ mesons. A step-by-step description of the mechanism for identifying the selection of the final state of a lepton pair and the recoil nucleon is presented. It is shown how the parameters of the distributions of kinematic quantities characteristic of the reactions under study change in the course of the analysis.
      PubDate: 2022-03-01
       
  • Spin-Dependent Multichannel Scattering of Electron in a Quantum Wire with
           a Point Defect

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      Abstract: The tunneling passage of a microparticle with a spin through a three-dimensional delta potential embedded in a quantum wire with a characteristic effect of dimensional quantization is considered. This effect results in multichannel scattering, which does not occur in one-dimensional problems. The particle is also affected by a magnetic field directed along the wire which generally takes unequal constant values on both sides of the barrier. Analytical expressions for the scattering coefficients and the spin polarization coefficient of multichannel scattering are obtained. Several special cases of the obtained formulas are considered. The dependences of the mentioned coefficients on the particle energy, the parameters of the potential barrier and nanotube, and the magnetic field are investigated in a single-channel approximation in detail.
      PubDate: 2022-03-01
       
  • Gas Flowmeter Based on Vibrating Wires

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      Abstract: The paper proposes a new type of gas flowmeters based on measurements of the deformations of the thermal field of the heater in the presence of a flow using vibrating wires. The advantage of such flowmeters as compared with the known ones using a similar thermal principle of operation is the improved accuracy of temperature measurements compared to resistance thermometers or thermocouples. The use of thin wires can also increase the speed of flowmeters. The use of wires 20–30 mm long allows the creation of wide-aperture inlet holes for gas streams. A natural property of the developed flowmeters is also in their bidirectionality. A sample of a flowmeter based on vibrating wires was made and the calibration experiments were carried out. An experiment was carried out in which a flowmeter was used to measure the acceleration.
      PubDate: 2022-03-01
       
  • Magnetic Field Inside a Two-Wire Spiral Line

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      Abstract: A direct current streamlined loop formed by two diametrically opposite spirals of a linear or ribbon wire is a deflector for nonrelativistic electrons and a spiral undulator for relativistic electrons. In this work, analytical expressions are obtained for the three components of magnetic induction inside a two-wire spiral line (TSL), which differ significantly from similar expressions used in scientific works. In particular, in the paraxial region, where electrons interact with the magnetic field, the radial component of the magnetic induction is not an increasing function of the radial coordinate, but a decreasing one. This result is important because the description of the physical characteristics of a free-electron laser or deflector requires taking into account the exact trajectories of the bunch electrons. The obtained correct formulas for the potential of the magnetic field and the components of the magnetic induction are also necessary to determine the values of the resonant frequencies of electromagnetic waves excited by a quasi-stationary sinusoidal voltage inside the TSL.
      PubDate: 2022-03-01
       
  • Rocking Curves of X-Ray Asymmetrical Laue Diffraction in a Crystal with
           the Third-Order Nonlinear Response

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      Abstract: The X-ray Laue asymmetrical diffraction in a perfect crystal with a plane entrance surface is considered taking into account the third-order nonlinear response of a crystal. Using the exact solutions, the rocking curve dependence on the angular departure from the exact Bragg direction and the intensity of the incident wave is investigated. The dependence of rocking curves on the asymmetry degree of diffraction geometry is studied. The obtained results can be used in the preparation of X-ray beams with the given parameters and for object investigations as well.
      PubDate: 2022-03-01
       
  • Test Electron Beams Based on the Linear Accelerator Complex LUE-75 of A.I.
           Alikhanyan National Scientific Laboratory

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      Abstract: Based on the linear electron accelerator LUE-75 of the A.I. Alikhanyan National Scientific Laboratory a technique for obtaining controlled primary electron beams with an intensity of 10–20 electrons per second in the energy range 15–75 MeV for elementary particle detectors calibration was developed and used. Joint work with the V.P. Dzhelepov Laboratory of Nuclear Problems (JINR, Dubna, RF) showed the efficiency of the technique.
      PubDate: 2022-03-01
       
  • Observation of Electroconvection in Nematic Liquid Crystals by X-Ray
           Interferometric Method

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      Abstract: The electroconvection (EC) phenomenon arising in nematic liquid crystals (NLC) of type E7 under the influence of an external electric field was recorded by the method of X-ray interferometry. The character of the refractive indices of the ordinary (no) and extraordinary (ne) waves is studied, and the moment of the appearance of EC in the NLC is determined. It is shown that the phenomenon of electroconvection occurs when no and ne coincide. It is also shown that in the E7 type NLC, where there are no free charge carriers, under the influence of an external electromagnetic field an EC phenomenon can occur as a consequence of the formation of bound charges.
      PubDate: 2021-10-01
      DOI: 10.3103/S1068337221040083
       
  • Spectral Properties of YAP:Yb Laser Crystals with Additional Li+ and Hf4+
           Ions

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      Abstract: In the present work single crystals of yttrium orthoaluminate (YAlO3) activated with Yb3+ ions and additional nonisovalent Li+ and Hf4+ impurities were grown. Comparative measurements of spectral characteristics of crystals including those exposed to gamma-ray irradiation were carried out to reveal the functional role of additional impurities. On the basis of the results obtained, the mechanisms of incorporation and charge compensation mechanisms of Li+ and Hf4+ ions in YAlO3:Yb are considered and the efficiency of using these impurities is shown to obtain crystals with a low concentration of anion vacancies and associated color centers.
      PubDate: 2021-10-01
      DOI: 10.3103/S1068337221040125
       
  • Critical Wavelength in the Metal Waveguide Partially Filled with Nonlinear
           Crystal

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      Abstract: The bandwidth in the system of the nonlinear optical crystal partially filling the cross-section of a rectangular metal waveguide is investigated. Partial filling of a metal waveguide with a nonlinear optical crystal is used to ensure the phase matching for an effective generation of THz radiation in a nonlinear crystal when it is illuminated with the femtosecond optical laser pulse. The critical wavelengths of a metal waveguide with a central symmetric arrangement of crystal plates in the waveguide are numerically calculated depending on the degree of partial filling and the dielectric permittivity of the crystal. It is shown that partial filling of the waveguide with crystal results in an expansion of the bandwidth of the fundamental mode of the odd type Н10, without improving the propagation conditions for the nearest higher even mode Н20, but on the contrary, at a certain degree of filling with the crystal excludes its occurrence.
      PubDate: 2021-10-01
      DOI: 10.3103/S1068337221040113
       
  • Hydrogen Peroxide Semiconductor Sensors

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      Abstract: The results of studies of many types of semiconductor H2O2 sensors are discussed in this review of 185 articles about hydrogen peroxide. The properties of electrochemical detectors, sensors based on organic and inorganic materials, graphene, and nano-sensors are analyzed. Optical and fluorescent sensors, detectors made of porous materials, quantum dots, fibers, and spheres are briefly discussed. The results of our studies in the YSU of hydrogen peroxide sensors made from solid solutions of carbon nanotubes with semiconducting metal oxides are also presented in the review. The fundamentals of the manufacture of biomarkers of respiration containing hydrogen peroxide vapors, which make it possible to judge the degree of a person’s illness with various respiratory diseases (asthma, lung cancer, etc.), are discussed.
      PubDate: 2021-10-01
      DOI: 10.3103/S1068337221040046
       
  • Description of Helix-Coil Transition in Heteropolymers in Frame of GMPC

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      Abstract: The work is devoted to the study of the behavior of heterogeneous biopolymers during the melting of the secondary structure. A random bimodal biopolymer is generated. Each component corresponds to its transfer matrix of GMPC, by multiplying these transfer matrices the free energy of the system is calculated. It is shown that for a length of 5000 repeating units, the reduced free energy does not depend on the realization of the system (primary structure). The corresponding denaturation curves show that the transition point is well defined as a linear combination of the corresponding homopolymers, but the profile of the curves depends on the implementation. The behavior of the number of junctions between the helical and coiled states is calculated. An unexpected result is obtained that the racemic heteropolymer with a length of 5000 repeated units is divided into about 10 sections during the melting process. We associate this with the behavior of correlation in the system, which will be investigated further.
      PubDate: 2021-10-01
      DOI: 10.3103/S106833722104006X
       
  • To the Problem of Description of the Wave Field Radiating by a System of
           Point Coherently Sources

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      Abstract: A consistent approach is developed to the description of a scalar wave field generated by a system of point coherently emitting sources. In particular, the problem of the maxima and minima of the intensity of the superposition field under the conditions of Fraunhofer diffraction is discussed. The problem of determining the serial number of the wave field maxima is investigated. Generalization of the classical result related to interference, when an initial phase shift is present at two sources, is carried out.
      PubDate: 2021-10-01
      DOI: 10.3103/S1068337221040095
       
  • Hard X-Ray Phase-Contrast Laboratory Microscope Based on Three-Block
           Fresnel Zone Plate Interferometer

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      Abstract: A device based on a three-block Fresnel zone plate interferometer is proposed for hard X‑ray phase-contrast imaging. The device combines a low requirement for the coherence of the initial radiation (the interferometer operates in the amplitude division mode) with an optical magnification of the image. A numerical simulation of the image formation is carried out, taking into account the limited source–interferometer distance, the size and spectral width of the X-ray source. The calculations show that the proposed set-up can be used as a phase-contrast microscope using laboratory hard X-ray sources.
      PubDate: 2021-10-01
      DOI: 10.3103/S1068337221040058
       
 
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