Aspects of a method of investigating the distributed load on oscillating wings

The paper discusses the method and technique of an experiment and also some results of the investigation of the unsteady pressure on the surface of a rectangular wing executing oscillations with angular amplitude * = 3° at Strouhal numbers p* = 0.113 (p* = /v, where * is the angular frequency, b is the chord of the wing, and v is the velocity of the oncoming flow).Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 5, pp. 178–181, September–October, 1981.     

Magnetic properties of the HoMn2Ge2 intermetallic compound

The magnetic properties of a tetragonal intermetallic compound, namely, HoMn₂Ge₂, are investigated experimentally and theoretically. The experimental temperature dependences of the initial magnetic susceptibility and the lattice parameters are obtained in alternating and static magnetic fields. The magnetization curves are measured in strong magnetic fields up to 50 T. The parameters of the crystal field and Ho-Mn and Mn-Mn exchange interactions are determined, and the temperature dependence of the magnetic field of the phase transition from an antiferromagnetic phase to a ferromagnetic phase in a magnetic field aligned along the tetragonal axis is calculated.     

Sea-level muon spectrum in the energy range 1–10 TeV from the data of underground experiments

Within an adjoint approach, the properties of the muon component in various types of rock and in water are calculated with allowance for fluctuations of energy losses in all muon-interaction processes. The behavior of the muon spectrum at sea level is established on the basis of a comparison of the muonabsorption curves obtained in this way and experimental data from underground facilities. It is shown that the deficit of the calculated muon flux obtained with the aid of data from direct measurements of the spectra of primary nuclei and Reggeon models of nuclear interactions is not less than 50% in the energy range 1–10 TeV.     

A new quasi-Ising magnet

We have performed measurements of the magnetization and differential magnetic susceptibility of Dy_0.62Y_2.38Fe₅O₁₂ single crystals in pulsed magnetic fields up to 45 T at liquid-helium temperature for three orientations of the external field: H‖[100], H‖[110], and H‖[111]. It was found that the magnetization reversal in the rare-earth magnetic subsystem occurs via several phase transitions, whose number depends on the direction of the external field, as is characteristic for Ising magnets. The anomalies in the field dependences of the magnetization are interpreted on the assumption of quasi-Ising ordering of the rare-earth ions. Pis’ma Zh. éksp. Teor. Fiz. 67, No. 8, 552–556 (25 April 1998)     

Angular distributions of 240-keV protons transmitted through insulating capillaries

The processes of interaction of accelerated protons with the surface of insulating capillaries have been investigated to determine the character of motion of particles during such interaction. The angular distributions of 240-keV protons transmitted through glass capillaries have been measured, and splitting of the distribution into a series of lines equally spaced from each other is revealed.     

Solid-State Gas Sensors

Journal of Analytical Chemistry - The main directions in developing solid-state gas-sensitive sensors are considered, i.e., catalytic (including semiconductor), electrochemical, thermoelectric,...     

Deficit of the calculated muon flux at sea level for E µ ≳ 100 GeV: Analysis of possible reasons

The reasons why a deficit of the calculated muon flux for E _μ ≳ 100 GeV arises if use is made of data from direct measurements of the spectra of primary cosmic rays and present-day nuclear-interaction models are considered. It is shown that this problem may stem from significantly underestimating the primary-nucleon flux in balloon-borne experiments employing the technique of emulsion chambers. This procedure relies on an extrapolation of accelerator data; therefore, it is necessary to estimate, on the basis of various Reggeon models of hadron interactions, the systematic error introduced by this circumstance in the results of the measurements. Such an analysis would make it possible to refine the behavior of the spectra of primary cosmic rays, to reduce the methodological part of the error in the calculation of the fluxes of secondary cosmic rays in the atmosphere, and to draw more precise conclusions on the flaws in present-day interaction models without invoking new accelerator data. Original Russian Text ? A.A. Lagutin, A. G. Tyumentsev, A. V. Yushkov, 2006, published in Yadernaya Fizika, 2006, Vol 69, No. 2, pp. 293–302.     

Estimation of the PCR mass composition in the energy range 1017–1019 eV on the basis of multicomponent analysis of the characteristics of EASs detected at the Yakutsk array

The characteristics of longitudinal and radial extensive air shower development derived from the results of detection of the charged particle flux and Cherenkov light in extensive air showers at the Yakutsk array. To estimate the primary cosmic ray composition, a combination of the parameters X_max and ρ₆₀₀ and the database simulated using the CORSIKA code (QGSJET model) for showers generated by five types of nuclei (p, He, C, Si, Fe) in the energy range 10¹⁷–10¹⁹ eV were used. Application of the multicomponent method made it possible to divide the showers into three groups (p + He), C, and (Si + Fe) and estimate their percentage. The error in identifying nuclei in the energy range 10¹⁷–10¹⁸ eV does not exceed 30%.