Charge and potential distributions near edge and screw dislocations in an ionic crystal
Charge and potential distributions near edge and screw dislocations in an ionic crystal
А.I. Kolomiitsev
The equilibrium charge of potential distributions have been deduced for screw and edge dislocations; this distribution is due to the dimensional effect and due to the modulus effect.
Show AbstractThe steady state in а reverberation field
The steady state in а reverberation field
I.V. Lebedeva and А.А. Shkol'nikova
The spatial uniformity of the acoustic field has been examined over the frequency range 100-4000 Hz for the reverberation chamber at Moscow University. The diffuse absorption coefficient for а resonant absorber has been measured bу the intensity method with various noise passbands, and the results are compared with those from the reverberation method with the same signals.
Show AbstractMutual synchronization of two relaxation oscillators
Mutual synchronization of two relaxation oscillators
G.А. Sidorova
Mutual synchronization to а single reference level is considered for oscillators producing triangular waves. The regions of existence of synchronous states are deduced and the staЫlity of these is considered.
Show AbstractThe UHF detection mechanism in а reflex klystron
The UHF detection mechanism in а reflex klystron
Yu.А. Pirogov
It is found that а virtual cathode is produced in the reflection space of the klystron, and detection occurs Ьу sorting of electrons in а velocity-modulated electron beam, with consideraЫe effects from the space charge. The voltagecurrent characteristic of the detecting gap has nodal points, which correspond to zero and turning points in the detected current. The calculated results agree well with experimental tests.
Show AbstractTheory of Mossbauer diffraction
Theory of Mossbauer diffraction
А.G. Grigoryan and V.А. Belyakov
The theory is developed in the kinematic appгoximation fоr crystals containing magnetic and nonuniform electric fields. Equations аге derived fоr the intensity and polarization of the radiation emitted bу the nucleus, together with the scattering amplitude fоr а nucleus, the coherent-scattering cross section fоr а crystal, and the polarization of the radiation in Bragg peaks when the quadrupole interaction is small compaгed with the magnetic one. The diffraction is discussed in deta1l fоr yttriurn garnet fеrritе γ_3Fе_2(FеО_4)_3.
Show AbstractPhase structure of the adjacent pressure field and of the oscillator speed of an unbounded circular cylinder
Phase structure of the adjacent pressure field and of the oscillator speed of an unbounded circular cylinder
А.I. Kartavenko, V.А. Kirshov, and О.S. Tonakanov
А theoretical study has been made of the phase picture in the near field for а fixed distance from а surface of an infinite cylinder for 1 ≤kro≥ 8. Measurements have been made of the phase differences between the individual components of the vibrational velocity for an acoustically soft finite cylinder; the agreement with theory is satisfactory.
Show AbstractGeneral properties of the root loci for equations with complex coefficients
General properties of the root loci for equations with complex coefficients
G.А. Bendrikov, V.I. Ogorodnikova, and N.А. Sukhacheva
Неrе we examine the general properties of the root loci for characteristic equations of order n with complex coefficients. We get such equations in the dynamics of а two-dimensional system with identical channels and antisymmetric cross-over positive and negative feedback couplings. We consider geometrical and analytical methЪds of constructing the root loci and the plane of complex frequencies, and derive equations for the root loci and the formulas for the loci parameters. An example is given to illustrate the use of the method in research on а two-dimensional servo system for angular following.
Show AbstractMethods for the approximate solution of the proЫem of Thomson system synchronization
Methods for the approximate solution of the proЫem of Thomson system synchronization
А.S. Kovalenko
The proЫem of the action of а small external sinusoidal emf on а Thomson-type oscillatory system is considered approximately in two limiting cases (for "hard" and "soft" limitation of the amplitude deviations from the equilibrium value, equal to the amplitude of free oscillations). The theoretical results are verifield experimentally.
Show AbstractWave function of а charged particle in а varying magnetic field
Wave function of а charged particle in а varying magnetic field
Yu.G. Pavlenko
An accurate solution of the Schrodinger equation is obtained for а charged particle in а magnetic field which varies in an arbitrary manner.
Show AbstractDiffraction of cold neutrons at ferromagnetic Bloch walls. Elastic scattering
Diffraction of cold neutrons at ferromagnetic Bloch walls. Elastic scattering
М. Bushev
The traditional methods of studying domain structure primarily give information on the structure of the specimen surface. Neutron diffraction techniques еnаЫе one to "illuminate" the ferromagnetic domains, and to investigate their structure in thick specimens. The elastic scattering cross section of cold neutrons scattered bу а plane-parallel domain structure is obtained taking into account the internal structure of the ferromagnetic Bloch walls. The experimental method is discussed. It is shown that for the majority of materials а diffraction pattern can only bе observed for а structures period 1 ≤ I0^{-5} cm.
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