Abstract The thermal capacity of solid nitrogen in the temperature range 2.6 to 15°K is investigated using an adiabatic calorimeter original construction. analysis results this paper and literature data on allow information about character rotational motion molecules crystalline be obtained. so‐called orientation defects give a considerable contribution near (35.6°K) phase transformation. In high‐temperature β‐phase practically free rotation molecule occurs.

In recent years, quantitative analysis of the magnetosphere-ionosphere coupling and electrodynamics polar ionosphere received much attention. Though remarkable progress has been made in this field by using a variety magnetogram inversion techniques order to infer global ionospheric current distribution, there is still need for modeling currents locally, over certain region, comparison with other geophysical ground-based satellite observations. This paper presents simple method estimating...

The energetics and structural properties of native, substitutional interstitial defects in NiAl have been investigated by first-principles methods. In particular, we determined the formation energies composition conserving established that so-called penta defect, which consists four vacancies on Ni sublattice antisite Al sublattice, is main source NiAl. We show this due to strong Ni-site preference also calculated site substitution behaviour Cu, Pd, Pt, Si, Ti, Cr, V, Nb, Ta Mo their effect...

On the basis of digital magnetometers from International monitor auroral geomagnetic effects (IMAGE) and European incoherent scatter (EISCAT) meridional chains in Scandinavia dynamics eastward westward electrojets during main phase magnetic storms are considered. For intense storm on May 10–11, 1992, with Dst = −300 nT, magnetograms subauroral midlatitudinal stations Leningrad, Borok, Moscow were examined. It is found that electrojet center shifts equatorward as | increases. The located at...

Abstract. We investigate variations in the location and intensity of auroral electrojets during magnetic storms substorms using a numerical method for estimating equivalent ionospheric currents based on data from meridian chains observatories. Special attention was paid to complex structure their interrelationship with diffuse discrete particle precipitation field-aligned dusk sector. During magnetospheric eastward electrojet (EE) evening sector changes local time cusp latitudes (Φ~77°)...

An efficient method is developed to achieve improved dispersion of detonation nanodiamond particles in amorphous thermoplastic matrices. For an estimation the distribution slices, a optical and transmission electron microscopy used. The complex set mechanical properties polymer-nanodiamond composites considered: tensile properties, Izod impact strength Brinell hardness. It found that reinforcing toughening effects uniformly-dispersed nanoparticles on polymer matrices pronounced at lower...

Comparison of X‐ray diffraction patterns from aluminium composites with agglomerated and non‐agglomerated nanodiamond reinforcement showing Roentgen radiation micro‐absorption. An absorption model was developed to clarify the physical essence this phenomenon.

This article examines the influence of loads, conventionally divided into static and cyclic ones, corrosion acting together on structural elements metal structures metro escalators. The dynamics processes are determined by environment, degree which, depending geographical location based seasonality, can vary from non-aggressive to highly aggressive. This, with simultaneous occurrence deformations (a stressed state is created in structure), lead fatigue failures. structure escalator this case...

The article describes the simulation of ontogenesis rock mineral aggregate with debatable genesis. Lenses or stokes weakly deformed rocks are found in South Urals block kyanite-bearing stratified Borisovskiye Sopki, structure which corresponds to structures igneous rocks. Induced surfaces joint simultaneous growth observed all minerals — muscovite, kyanite, quartz, rutile, pyrite, monazite, xenotime and zircon. This is a paragenesis (eutectics). An interesting fact that large quartz...

Identification of non‐agglomerated nanodiamonds in an aluminum matrix at a content 3–10 vol% was performed on compacted specimens using KMC‐2 beamline the BESSY II synchrotron. Composites were produced by mechanical alloying process that allowed uniform distribution individual primary nanodiamond particles metal matrix, as verified scanning electron microscopy investigation composite granule's surface. The study demonstrated for first time application synchrotron radiation could effectively...

After detonation synthesis, primary nanodiamond particles are around 4–6 nm in size. However, they join into agglomerates with larger parameters and weak bonds between particles. The introduction of a metal matrix can lead to the weakness composites. This paper demonstrates possibility obtaining non-agglomerated distribution nanodiamonds inside matrix. fabrication method was based on mechanical alloying create additional stresses deformations by phase transformations during treatment...

Abstract The heat capacity of solid tetrafluoromethane has been measured in the temperature range 2 to 20 °K. analysis results this paper and literature data on allow make conclusions about character motion molecules crystalline CF 4 . An “extra” near phase transformation T λ = 76.09 °K is due orientational disordering. dependence Δ C or well described by logarithmic function ∼ lg ∼|– | λ|.

Abstract We show that the use of mechanical alloying makes it possible to produce metal matrix composites with uniformly distributed nonagglomerated nanodiamond (ND) reinforcing particles. An aluminium has been used for this study. X‐ray analysis shows a composite structure containing nanoparticles 4–6 nm can significantly slow down process recrystallization during heating, which becomes evident only when material is heated above 350 °C. Higher volume fractions diamond lead higher starting...

Polyakovite-(Ce), ideally REE 4 Mg Cr3+2 Ti2 Si4 O22, monoclinic, a 13.398(1), b 5.6974(5), c 11.042(1) A, β 100.539(2)°, V 828.6(2) A3, a:b:c = 2.3516:1:1.9381, space group C 2/ m , Z 2, is new mineral species from the Ilmen Mountains, southern Urals, Russia. It of hydrothermal origin; associated minerals are calcite, dolomite, fluororichterite, phlogopite, forsterite, monazite-(Ce), clinohumite, chromite and davidite-(Ce). occurs as irregular grains up to 3 cm in diameter euhedral crystals...

The absence of acute toxicity pristine fullerene C60 (3.5–8.9 mg/kg) after intraperitoneal injection water soluble C60/PVP complex to rats was shown.