16 research outputs found
Charm in cosmic rays (The long-flying component of EAS cores)
Experimental data on cosmic ray cascades with enlarged attenuation lengths
(Tien-Shan effect) are presented and analyzed in terms of charm
hadroproduction. The very first estimates of charm hadroproduction cross
sections from experimental data at high energies are confirmed and compared
with recent accelerator results.Comment: 12 pages, 8 figures, LATE
ΠΡΠ΅Π½ΠΊΠ° ΡΠ²ΠΎΠΉΡΡΠ² ΠΊΠΎΡΡΠ½ΠΎΠ·Π°ΠΌΠ΅ΡΠ°ΡΡΠΈΡ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΏΠΎΠ»ΠΈΡΡΠΈΠ»Π΅Π½Π³Π»ΠΈΠΊΠΎΠ»Ρ Π΄ΠΈΠ°ΠΊΡΠΈΠ»Π°ΡΠ° ΠΈ ΠΎΠΊΡΠ°ΠΊΠ°Π»ΡΡΠΈΠ΅Π²ΠΎΠ³ΠΎ ΡΠΎΡΡΠ°ΡΠ° Π½Π° ΠΌΠΎΠ΄Π΅Π»ΠΈ ΠΌΠΎΠ½ΠΎΠΊΠΎΡΡΠΈΠΊΠ°Π»ΡΠ½ΠΎΠ³ΠΎ Π΄ΠΈΠ°ΡΠΈΠ·Π°ΡΠ½ΠΎΠ³ΠΎ Π΄Π΅ΡΠ΅ΠΊΡΠ° Π±Π΅Π΄ΡΠ΅Π½Π½ΠΎΠΉ ΠΊΠΎΡΡΠΈ ΠΊΡΡΡΡ: ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΎΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅
Background. The problem of bone defects replacement is relevant nowadays, that is why many scientists create new synthetic bone substitutes, but the ideal material has not been found so far.
The aims of the study: 1) to determine the suitability of the monocortical defect model in the rat femur diaphysis with additional prophylactic reinforcement with a bone plate for assessing the biological properties of implanted materials using the commercially available ChronOS material as an example; 2) to assess of the osteoconductive properties of composite materials based on poly(ethylene glycol)diacrylate and octacalcium phosphate with architecture Kelvin and gyroid types on the developed model.
Methods. A prospective study, level of evidence II. A monocortical defect of the rat femoral diaphysis (length 7 mm) was produced under anaesthesia in aseptic conditions and fixed with a polyetheretherketone plate and six titanium screws. In the control group, the defect was left empty. In other groups, blocks of one of three materials were implanted ΡhronOS and composites of poly(ethylene glycol)diacrylate and octacalcium phosphate with 3D-printed Kelvin and gyroid architectures. After 3 and 6 weeks, the rats were sacrificed, and histological examination of the defect zone was performed. The amount of newly formed bone tissue was histometricly assessed, followed by statistical processing of the results.
Results. All rats have reached the planned endpoint, and there were no infectious complications or loss of fixation. Histological examination of the defect zone revealed minimal bone growth in the Control group, rather slow bone formation in the Gyroid group, and statistically significantly more pronounced bone formation in the pores of the materials in the Kelvin and Chronos groups.
Conclusions. Bone defect in this model was not spontaneously filled with bone tissue and allowed us to study the biological properties of bone substitutes (the ability to biodegrade and osteoconductive properties). The osteoconductive properties of a composite material based on poly(ethylene glycol)diacrylate and octacalcium phosphate with a Kelvin architecture are higher than with a gyroid architecture and are comparable to that of the ΡhronOS.ΠΠΊΡΡΠ°Π»ΡΠ½ΠΎΡΡΡ. ΠΡΠΎΠ±Π»Π΅ΠΌΠ° Π·Π°ΠΌΠ΅ΡΠ΅Π½ΠΈΡ Π΄Π΅ΡΠ΅ΠΊΡΠΎΠ² ΠΊΠΎΡΡΠΈ Π°ΠΊΡΡΠ°Π»ΡΠ½Π° Π² Π½Π°ΡΡΠΎΡΡΠ΅Π΅ Π²ΡΠ΅ΠΌΡ, ΠΏΠΎΡΡΠΎΡΠ½Π½ΠΎ Π²Π΅Π΄ΡΡΡΡ ΠΏΠΎΠΈΡΠΊΠΈ Π½ΠΎΠ²ΡΡ
ΡΠΈΠ½ΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΊΠΎΡΡΠ½ΠΎΠ·Π°ΠΌΠ΅ΡΠ°ΡΡΠΈΡ
ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ², ΠΎΠ΄Π½Π°ΠΊΠΎ ΠΈΠ΄Π΅Π°Π»ΡΠ½ΡΠΉ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π» Π½Π΅ Π½Π°ΠΉΠ΄Π΅Π½ Π΄ΠΎ ΡΠΈΡ
ΠΏΠΎΡ.
Π¦Π΅Π»ΠΈ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ: 1) ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ ΠΏΡΠΈΠ³ΠΎΠ΄Π½ΠΎΡΡΠΈ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΠΌΠΎΠ½ΠΎΠΊΠΎΡΡΠΈΠΊΠ°Π»ΡΠ½ΠΎΠ³ΠΎ Π΄Π΅ΡΠ΅ΠΊΡΠ° Π΄ΠΈΠ°ΡΠΈΠ·Π° Π±Π΅Π΄ΡΠ΅Π½Π½ΠΎΠΉ ΠΊΠΎΡΡΠΈ ΠΊΡΡΡΡ Ρ Π΄ΠΎΠΏΠΎΠ»Π½ΠΈΡΠ΅Π»ΡΠ½ΡΠΌ ΠΏΡΠΎΡΠΈΠ»Π°ΠΊΡΠΈΡΠ΅ΡΠΊΠΈΠΌ Π°ΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ ΠΏΡΠΈ ΠΏΠΎΠΌΠΎΡΠΈ Π½Π°ΠΊΠΎΡΡΠ½ΠΎΠΉ ΠΏΠ»Π°ΡΡΠΈΠ½Ρ Π΄Π»Ρ ΠΎΡΠ΅Π½ΠΊΠΈ Π±ΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ²ΠΎΠΉΡΡΠ² ΠΈΠΌΠΏΠ»Π°Π½ΡΠΈΡΡΠ΅ΠΌΡΡ
ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² Π½Π° ΠΏΡΠΈΠΌΠ΅ΡΠ΅ ΠΊΠΎΠΌΠΌΠ΅ΡΡΠ΅ΡΠΊΠΈ Π΄ΠΎΡΡΡΠΏΠ½ΠΎΠ³ΠΎ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π° ΡhronOS; 2) ΠΎΡΠ΅Π½ΠΊΠ° ΠΎΡΡΠ΅ΠΎΠΊΠΎΠ½Π΄ΡΠΊΡΠΈΠ²Π½ΡΡ
ΡΠ²ΠΎΠΉΡΡΠ² ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ½ΡΡ
ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΏΠΎΠ»ΠΈΡΡΠΈΠ»Π΅Π½Π³Π»ΠΈΠΊΠΎΠ»Ρ Π΄ΠΈΠ°ΠΊΡΠΈΠ»Π°ΡΠ° ΠΈ ΠΎΠΊΡΠ°ΠΊΠ°Π»ΡΡΠΈΠ΅Π²ΠΎΠ³ΠΎ ΡΠΎΡΡΠ°ΡΠ° Ρ Π°ΡΡ
ΠΈΡΠ΅ΠΊΡΡΡΠΎΠΉ ΠΠ΅Π»ΡΠ²ΠΈΠ½Π° ΠΈ ΡΠΈΠΏΠ° Π³ΠΈΡΠΎΠΈΠ΄ Π½Π° ΡΠ°Π·ΡΠ°Π±ΠΎΡΠ°Π½Π½ΠΎΠΉ ΠΌΠΎΠ΄Π΅Π»ΠΈ.
ΠΠ°ΡΠ΅ΡΠΈΠ°Π» ΠΈ ΠΌΠ΅ΡΠΎΠ΄Ρ. ΠΠΎΠ½ΠΎΠΊΠΎΡΡΠΈΠΊΠ°Π»ΡΠ½ΡΠΉ Π΄Π΅ΡΠ΅ΠΊΡ Π΄ΠΈΠ°ΡΠΈΠ·Π° Π±Π΅Π΄ΡΠ΅Π½Π½ΠΎΠΉ ΠΊΠΎΡΡΠΈ ΠΊΡΡΡ ΡΠ°Π·ΠΌΠ΅ΡΠΎΠΌ 7 ΠΌΠΌ Π² Π΄Π»ΠΈΠ½Ρ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΠΈΠ»ΠΈ ΠΏΠΎΠ΄ Π½Π°ΡΠΊΠΎΠ·ΠΎΠΌ Π² Π°ΡΠ΅ΠΏΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΡΠ»ΠΎΠ²ΠΈΡΡ
ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΉ ΠΈ ΡΠΈΠΊΡΠΈΡΠΎΠ²Π°Π»ΠΈ ΠΏΠΎΠ»ΠΈΡΡΠΈΡΡΡΠΈΡΠΊΠ΅ΡΠΎΠ½ΠΎΠ²ΠΎΠΉ ΠΏΠ»Π°ΡΡΠΈΠ½ΠΎΠΉ ΠΈ ΡΠ΅ΡΡΡΡ ΡΠΈΡΠ°Π½ΠΎΠ²ΡΠΌΠΈ Π²ΠΈΠ½ΡΠ°ΠΌΠΈ. ΠΡΡΡ ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»ΡΠ»ΠΈ ΡΠ»ΡΡΠ°ΠΉΠ½ΡΠΌ ΠΎΠ±ΡΠ°Π·ΠΎΠΌ Π½Π° ΡΠ΅ΡΡΡΠ΅ Π³ΡΡΠΏΠΏΡ ΠΏΠΎ 12 ΠΎΡΠΎΠ±Π΅ΠΉ Π² ΠΊΠ°ΠΆΠ΄ΠΎΠΉ. Π Π³ΡΡΠΏΠΏΠ΅ ΠΠΎΠ½ΡΡΠΎΠ»Ρ Ρ ΠΆΠΈΠ²ΠΎΡΠ½ΡΡ
ΠΊΠΎΡΡΠ½ΡΠΉ Π΄Π΅ΡΠ΅ΠΊΡ Π½Π΅ Π·Π°ΠΏΠΎΠ»Π½ΡΠ»ΠΈ. Π£ ΠΆΠΈΠ²ΠΎΡΠ½ΡΡ
Π² Π³ΡΡΠΏΠΏΠ΅ Π₯ΡΠΎΠ½ΠΎΡ Π΄Π΅ΡΠ΅ΠΊΡ Π·Π°ΠΏΠΎΠ»Π½ΡΠ»ΠΈ ΠΏΠΎΠ΄Π³ΠΎΡΠΎΠ²Π»Π΅Π½Π½ΡΠΌ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠΌ chronOS Π² Π²ΠΈΠ΄Π΅ ΠΏΠΎΠ»ΡΡΠΈΠ»ΠΈΠ½Π΄ΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π±Π»ΠΎΠΊΠ°, Π² Π³ΡΡΠΏΠΏΠ΅ ΠΠ΅Π»ΡΠ²ΠΈΠ½ ΠΈΡΡΠ»Π΅Π΄ΡΠ΅ΠΌΡΠΌ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠΌ Ρ Π°ΡΡ
ΠΈΡΠ΅ΠΊΡΡΡΠΎΠΉ ΠΠ΅Π»ΡΠ²ΠΈΠ½Π°, Π² Π³ΡΡΠΏΠΏΠ΅ ΠΠΈΡΠΎΠΈΠ΄ ΠΈΡΡΠ»Π΅Π΄ΡΠ΅ΠΌΡΠΌ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠΌ Ρ Π°ΡΡ
ΠΈΡΠ΅ΠΊΡΡΡΠΎΠΉ ΡΠΈΠΏΠ° Π³ΠΈΡΠΎΠΈΠ΄. Π§Π΅ΡΠ΅Π· 3 ΠΈ 6 Π½Π΅Π΄. ΠΊΡΡΡ Π²ΡΠ²ΠΎΠ΄ΠΈΠ»ΠΈ ΠΈΠ· ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ° ΠΈ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΠΈΠ»ΠΈ Π³ΠΈΡΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ Π·ΠΎΠ½Ρ Π΄Π΅ΡΠ΅ΠΊΡΠ°. ΠΠ°ΡΠ΅ΠΌ Π²ΡΠΏΠΎΠ»Π½ΡΠ»ΠΈ Π³ΠΈΡΡΠΎΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΡΡ ΠΎΡΠ΅Π½ΠΊΡ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²Π° Π½ΠΎΠ²ΠΎΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½Π½ΠΎΠΉ ΠΊΠΎΡΡΠ½ΠΎΠΉ ΡΠΊΠ°Π½ΠΈ Ρ ΠΏΠΎΡΠ»Π΅Π΄ΡΡΡΠ΅ΠΉ ΡΡΠ°ΡΠΈΡΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΎΠ±ΡΠ°Π±ΠΎΡΠΊΠΎΠΉ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΎΠ².
Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. Π Ρ
ΠΎΠ΄Π΅ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ° Π²ΡΠ΅ ΠΆΠΈΠ²ΠΎΡΠ½ΡΠ΅ Π΄ΠΎΡΡΠΈΠ³Π»ΠΈ ΠΏΠ»Π°Π½ΠΈΡΡΠ΅ΠΌΠΎΠΉ ΠΊΠΎΠ½Π΅ΡΠ½ΠΎΠΉ ΡΠΎΡΠΊΠΈ, ΠΈΠ½ΡΠ΅ΠΊΡΠΈΠΎΠ½Π½ΡΠ΅ ΠΎΡΠ»ΠΎΠΆΠ½Π΅Π½ΠΈΡ ΠΈ ΠΏΠΎΡΠ΅ΡΡ ΡΠΈΠΊΡΠ°ΡΠΈΠΈ Π·Π°ΡΠΈΠΊΡΠΈΡΠΎΠ²Π°Π½Ρ Π½Π΅ Π±ΡΠ»ΠΈ. ΠΡΠΈ Π³ΠΈΡΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠΌ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΈ Π·ΠΎΠ½Ρ Π΄Π΅ΡΠ΅ΠΊΡΠ° Π²ΡΡΠ²Π»Π΅Π½ ΠΌΠΈΠ½ΠΈΠΌΠ°Π»ΡΠ½ΡΠΉ ΡΠΎΡΡ ΠΊΠΎΡΡΠΈ Π² Π³ΡΡΠΏΠΏΠ΅ ΠΠΎΠ½ΡΡΠΎΠ»Ρ, Π΄ΠΎΡΡΠ°ΡΠΎΡΠ½ΠΎ ΠΌΠ΅Π΄Π»Π΅Π½Π½ΠΎΠ΅ ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΊΠΎΡΡΠΈ Π² ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π΅ Π³ΡΡΠΏΠΏΡ ΠΠΈΡΠΎΠΈΠ΄ ΠΈ ΡΡΠ°ΡΠΈΡΡΠΈΡΠ΅ΡΠΊΠΈ Π·Π½Π°ΡΠΈΠΌΠΎ Π±ΠΎΠ»Π΅Π΅ Π²ΡΡΠ°ΠΆΠ΅Π½Π½ΠΎΠ΅ ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΊΠΎΡΡΠ½ΠΎΠΉ ΡΠΊΠ°Π½ΠΈ Π² ΠΏΠΎΡΠ°Ρ
ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² Π² Π³ΡΡΠΏΠΏΠ°Ρ
ΠΠ΅Π»ΡΠ²ΠΈΠ½ ΠΈ Π₯ΡΠΎΠ½ΠΎΡ.
ΠΠ°ΠΊΠ»ΡΡΠ΅Π½ΠΈΠ΅. Π Π°Π·ΡΠ°Π±ΠΎΡΠ°Π½Π½Π°Ρ ΠΌΠΎΠ΄Π΅Π»Ρ Π΄Π΅ΡΠ΅ΠΊΡΠ° ΠΊΠΎΡΡΠΈ ΡΠΏΠΎΠ½ΡΠ°Π½Π½ΠΎ Π½Π΅ Π·Π°ΠΏΠΎΠ»Π½ΡΠ΅ΡΡΡ ΠΊΠΎΡΡΠ½ΠΎΠΉ ΡΠΊΠ°Π½ΡΡ ΠΈ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΠ΅Ρ ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΡΡ ΠΈΠ·ΡΡΠ΅Π½ΠΈΠ΅ Π±ΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ²ΠΎΠΉΡΡΠ² ΠΊΠΎΡΡΠ½ΠΎΠΏΠ»Π°ΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² (ΡΠΏΠΎΡΠΎΠ±Π½ΠΎΡΡΡ ΠΊ Π±ΠΈΠΎΠ΄Π΅Π³ΡΠ°Π΄Π°ΡΠΈΠΈ ΠΈ ΠΎΡΡΠ΅ΠΎΠΊΠΎΠ½Π΄ΡΠΊΡΠΈΠ²Π½ΡΠ΅ ΡΠ²ΠΎΠΉΡΡΠ²Π°). ΠΡΡΠ΅ΠΎΠΊΠΎΠ½Π΄ΡΠΊΡΠΈΠ²Π½ΡΠ΅ ΡΠ²ΠΎΠΉΡΡΠ²Π° ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ½ΠΎΠ³ΠΎ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π° Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΏΠΎΠ»ΠΈΡΡΠΈΠ»Π΅Π½Π³Π»ΠΈΠΊΠΎΠ»Ρ Π΄ΠΈΠ°ΠΊΡΠΈΠ»Π°ΡΠ° ΠΈ ΠΎΠΊΡΠ°ΠΊΠ°Π»ΡΡΠΈΠ΅Π²ΠΎΠ³ΠΎ ΡΠΎΡΡΠ°ΡΠ° Ρ Π°ΡΡ
ΠΈΡΠ΅ΠΊΡΡΡΠΎΠΉ ΠΠ΅Π»ΡΠ²ΠΈΠ½Π° Π²ΡΡΠ΅, ΡΠ΅ΠΌ Ρ Π°ΡΡ
ΠΈΡΠ΅ΠΊΡΡΡΠΎΠΉ ΡΠΈΠΏΠ° Π³ΠΈΡΠΎΠΈΠ΄, ΠΈ ΡΠΎΠΏΠΎΡΡΠ°Π²ΠΈΠΌΡ Ρ ΡΠ°ΠΊΠΎΠ²ΡΠΌΠΈ Ρ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π° ΡhronOS
Measuring the deposited energy by the scintillation calorimeter in the ATIC experiment
Energy Spectra of Abundant Nuclei of Primary Cosmic Rays from the Data of ATIC-2 Experiment: Final Results
The final results of processing the data from the balloon-born experiment
ATIC-2 (Antarctica, 2002-2003) for the energy spectra of protons and He, C, O,
Ne, Mg, Si, and Fe nuclei, the spectrum of all particles, and the mean
logarithm of atomic weight of primary cosmic rays as a function of energy are
presented. The final results are based on improvement of the methods used
earlier, in particular, considerably increased resolution of the charge
spectrum. The preliminary conclusions on the significant difference in the
spectra of protons and helium nuclei (the proton spectrum is steeper) and the
non-power character of the spectra of protons and heavier nuclei (flattening of
carbon spectrum at energies above 10 TeV) are confirmed. A complex structure of
the energy dependence of the mean logarithm of atomic weight is found.Comment: 4 pages, a paper for 30th Russian Cosmic Ray Conference (2008, St.
Petersburg
Two Mathematically Equivalent Versions of Maxwell's Equations
This paper is a review of the canonical proper-time approach to relativistic
mechanics and classical electrodynamics. The purpose is to provide a physically
complete classical background for a new approach to relativistic quantum
theory. Here, we first show that there are two versions of Maxwell's equations.
The new version fixes the clock of the field source for all inertial observers.
However now, the (natural definition of the effective) speed of light is no
longer an invariant for all observers, but depends on the motion of the source.
This approach allows us to account for radiation reaction without the
Lorentz-Dirac equation, self-energy (divergence), advanced potentials or any
assumptions about the structure of the source. The theory provides a new
invariance group which, in general, is a nonlinear and nonlocal representation
of the Lorentz group. This approach also provides a natural (and unique)
definition of simultaneity for all observers. The corresponding particle theory
is independent of particle number, noninvariant under time reversal (arrow of
time), compatible with quantum mechanics and has a corresponding positive
definite canonical Hamiltonian associated with the clock of the source.
We also provide a brief review of our work on the foundational aspects of the
corresponding relativistic quantum theory. Here, we show that the standard
square-root and the Dirac equations are actually two distinct
spin- particle equations.Comment: Appeared: Foundations of Physic
Spontaneous Lorentz Violation via QED with Non-Exact Gauge Invariance
We reconsider an alternative theory of the QED with the photon as a massless
vector Nambu-Goldstone boson and show that the underlying spontaneous Lorentz
violation caused by the vector field vacuum expectation value, while being
superficial in gauge invariant theory, becomes physically significant in the
QED with a tiny gauge non-invariance. This leads, through special dispersion
relations appearing for charged fermions, to a new class of phenomena which
could be of distinctive observational interest in particle physics and
astrophysics. They include a significant change in the GZK cutoff for UHE
cosmic-ray nucleons, stability of high-energy pions and W bosons, modification
of nucleon beta decays, and some others.Comment: 15 pages, to appear in Eur.Phys.J.
New precision measurement of the - and -meson masses
A new high precision measurement of the - and -meson masses
has been performed at the VEPP-4M collider using the KEDR detector. The
resonant depolarization method has been employed for the absolute calibration
of the beam energy. The following mass values have been obtained:
MeV,
MeV.
The relative measurement accuracy has reached for and
for , approximately 3 times better than in the previous
precise experiments.Comment: 12 pages, 4 tables, 10 figure
Improving the reliability of operation of electromechanical devices by means of ionistor-battery backup
This article is devoted to the problem of improving the operation reliability of electromechanical devices and devices at electric power industry facilities. Particular attention is paid to the fact that in the Russian power system electromechanical devices and devices designed for a voltage class of 110 kV and higher are still the majority compared to microprocessor and microelectronic devices. Given their long service life and the inability to promptly replace all devices at once, improving the reliability of their operation is highly relevant. A schematic solution to the problem is developed. The scientific novelty of the proposed solution is of the fact that the redundant power supply circuit with operating current of electromechanical devices offers a consolidated use of innovative electric power storage devices, namely ionistors and classic rechargeable batteries combined according to a special circuit. This solution maximizes the operation reliability of both electromechanical devices and devices themselves, as well as their automatic control
Ensuring efficient operation of electromechanical systems with frequency regulation with periodic voltage sags
The article reflects influence of high-power electricity consumers on control elements of frequency control of electric drive. Solution of problem of eliminating influence of voltage dips on electromechanical systems by means of a modern method of reactive power compensation is presented. Graphs of power, current, voltage versus time are presented, graphs of voltage curve are analyzed in detail with proposal of method of its normalization