Under the action of the illuminating electron beam in an electron microscope, dislocations in Al-Mg alloys start to move during examination. It was found that screw dislocations move and change easily their moving direction producing many double cross-slip traces, and that slip and cross-slip first occur on those {111} planes lying close to the position at 45°with the foil surface. The cross-slip ...
Variations of internal friction in the course of strain-aging at room temperature of slightly cold-worked Al-0.1% Mg alloy were measured with a torsion pendulum and an internal friction peak (versus aging time) exhibiting anomalous amplitute effect was observed. When the internal friction of a fully aged specimen was measured with the temperature going up and down, internal friction peaks (versus ...
Assuming the metals to be an isotropic, unbounded and homogenous elastic continuum, the tetrahedral and octahedral position energy of interstials (C,N,O and H) in b.c.c. metals (Fe, W, Mo, Ta and Nb) are evaluated by means of the concept of elastic dipole. The results show that all of them occupy the octahetral positions except H, which in W, Mo, Ta and Nb favours the tetrahedral position, and the...
The influence of transverse magnetic field on surface a.c. field-effect in germanium has been studied, and a different interpretation from other inverstigators is proposed. According to our experimental results, it may be considered that the influence of magnetic field on surface field-effect is predominantly referred to the additional change in conductance of sample caused by the "magnetic-concen...
Using the zone-levelling technique, homogeneous alloys of the AlSb-GaSb-InSb system were obtained. The homogenized specimens were studied by means of the X-ray (Debye-Scherrer) method and differential thermal analysis. These results showed that in the above mentioned system solid solutions occur in all range of compositions. The liquidus projection of the AlSb-GaSb-InSb system and the relation bet...
This paper analyzes, with single energy-level recombination-centre model, the phase-shift lifetime of excess carriers in semiconductors under sinusoidal injection. Hence are obtained the difference and sameness between phase-shift lifetime and static state lifetime as well as transient state lifetime:1. The phase-shift lifetime in relation with the injection frequency decreases as the frequency in...
The relation between the subtracted dispersion relations for the low energy pion-nucleon scattering and the usual Lagrangian formulation under the renormalization treatment is discussed in the present paper. It is shown that the subtraction actually represents the renormalization of the interaction constants. Using the subtracted dispersion relations we have treated the problem of the S-wave pion ...
In this paper, we discuss the lepton structure and the (μ-e mass-difference on the basis of the "muonic charge" model. Some general theorems concerning the lepton structure are demonstrated. For example, it is shown that the form factors of "muonic charge" current and of electric current of charged lepton having anomalous interaction are equal. As a result, this lepton would posses a "muonic momen...
In this work we report experimental studies of the critical magnetic field for indium films of different thicknesses alloyed with 2 at.% and 3 at.% of tin, thus furnishing, for the first time, experimental data of Hc~d for the case of finite electronic mean free path. From these data, it is concluded that the critical magnetic field of thin films can only be discussed in the light of the non-local...
In ferromagnets and antiferromagnets, the coupling between phonons and magnons cannot be overlooked, because of the exchange interaction changing with the distance between the magnetic ions. In this article, the possible effect of this coupling on the infrared absorption in magnetic insulators has been considered. The transition involved consists of the excitation of an optical phonon by the inter...