187 research outputs found
Quantum analogue of the spin-flop transition for a spin pair
Quantum (step-like) magnetization curves are studies for a spin pair with
antiferromagnetic coupling in the presence of a magnetic field parallel to the
easy axis of the magnetic anisotropy. The consideration is done both
analytically and numerically for a wide range of the anisotropy constants and
spins up to . Depending on the origin of the anisotropy
(exchange or single-ion), the magnetization curve can demonstrate the jumps
more than unity and the concentration of the unit jumps in a narrow range of
the field. We also point the region of the problem parameters, where the
behavior is quasiclassical for , and where system is substantially
quantum in the limit .Comment: 5 pages, 5 figure
New Method of Plague Agent Lipopolysaccharide Obtaining
Put forward are two alternatives of a new method for optimization of conditions of LPS obtaining and purification from Y. pestis strains; as well as for avoiding application of poisonous and hard-to-remove reagents; for simplification and cost-cutting of the technique; and for rationalization of production waste management. This method involves preliminary salt-water extraction of bacteria, for elimination of easy-dissolving substances, with the subsequent fracturing using ultrasound in lysing buffer (0,1 M Tris-HCl, pH 8,0; 10 mmol of EDTA, 1 % Triton X-100). The first alternative for deproteinization of non-purified endotoxin is the commercial preparation of proteinase K (Sigma), the second one - an enzyme complex - proteovibrin, isolated from waste material accumulated in the process of cholera chemical bivalent vaccine production. Apart from this, introduced has been a phase of sample acidification by applying glacial acetic acid up to pH 3,2-3,4 to decontaminate LPS from nucleic acids. These two variations of the method provide for enhancement of LPS preparation quality as compared to prototype method, and for obtainment of plague agent endotoxin that is hardly distinguishable in physical-chemical properties, homogeneity, immunochemical activity and specificity from the antigen, manufactured by means of water-phenol extraction following Westphal O. technique
Properties of Neutral Charmed Mesons in Proton--Nucleus Interactions at 70 GeV
The results of treatment of data obtained in the SERP-E-184experiment
"Investigation of mechanisms of the production of charmed particles in
proton-nucleus interactions at 70 GeV and their decays" by irradiating the
active target of the SVD-2 facility consisting of carbon, silicon, and lead
plates, are presented. After separating a signal from the two-particle decay of
neutral charmed mesons and estimating the cross section for charm production at
a threshold energy {\sigma}(c\v{c})=7.1 \pm 2.4(stat.) \pm 1.4(syst.)
\mub/nucleon, some properties of D mesons are investigated. These include the
dependence of the cross section on the target mass number (its A dependence);
the behavior of the differential cross sections d{\sigma}/dpt2 and
d{\sigma}/dxF; and the dependence of the parameter {\alpha} on the kinematical
variables xF, pt2, and plab. The experimental results in question are compared
with predictions obtained on the basis of the FRITIOF7.02 code.Comment: 9 pages, 9 figures,3 table
Alternative approach to electromagnetic field quantization in nonlinear and inhomogeneous media
A simple approach is proposed for the quantization of the electromagnetic
field in nonlinear and inhomogeneous media. Given the dielectric function and
nonlinear susceptibilities, the Hamiltonian of the electromagnetic field is
determined completely by this quantization method. From Heisenberg's equations
we derive Maxwell's equations for the field operators. When the nonlinearity
goes to zero, this quantization method returns to the generalized canonical
quantization procedure for linear inhomogeneous media [Phys. Rev. A, 43, 467,
1991]. The explicit Hamiltonians for the second-order and third-order nonlinear
quasi-steady-state processes are obtained based on this quantization procedure.Comment: Corrections in references and introductio
Comparative Study of Some Physical-Chemical and Immunochemical Properties of Plague Microbe Lipopolysaccharide Preparations Obtained with the Help of Different Techniques
, and degraded polysaccharide (PS) are easily soluble in water and in 0,9 % NaCl solution. They are homogenous and characterized by an adequate degree of purity. Aside from that, it is demonstrated that potentially PS is the most productive molecule fragment of LPS for the construction of plague immunodiagnostic preparation, since despite its decreased cytotoxocity PS retains identity of chemical composition and immunechemical specificity of endotoxin
ΠΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠΈ ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π½ΠΎΠ³ΠΎ ΠΎΠ±ΠΌΠ΅Π½Π° Π² Π»Π°Π½ΡΠ°Π½-ΡΡΡΠΎΠ½ΡΠΈΠ΅Π²ΡΡ ΠΌΠ°Π½Π³Π°Π½ΠΈΡΠ°Ρ , Π΄ΠΎΠΏΠΈΡΠΎΠ²Π°Π½Π½ΡΡ ΠΆΠ΅Π»Π΅Π·ΠΎΠΌ
Based on the data of thermogravimetric analysis the values of the oxygen index (3βΞ΄) in the manganite of the La0.7Sr0.3Mn0.9Fe0.1O3-Ξ΄ composition, obtained by solid-phase reaction technique, have been calculated. The analysis of oxygen sorption-desorption curves showed that the processes of oxygen release and absorption at pO2 = 10 Pa and pO2 = 400 Pa are not reversible. The minima of the derivative dΞ΄/dt = f(T) corresponding to the maxima of the oxygen extraction rate indicate the complex character of changes in the oxygen desorption rate from manganite. The decrease in the heating and cooling rate from 6.6 to 2.6 K/min resulted in a significant change in the value βΞ΄, indicating the dependence of anion mobility on the oxygen concentration in the magnet structure. It has been revealed that in the La0.7Sr0.3Mn0.9Fe0.1O3-Ξ΄ manganite the oxygen desorption kinetics is well described by the exponential dependence on the Cramers model, which implies no return of desorbed oxygen to the sample. This model indicates the non-stationarity of the diffusion flux through the barrier during desorption of oxygen from samples. The calculation of the activation energy of oxygen desorption by the Merzhanov method at various partial pressures of oxygen has shown that at the initial stage of oxygen extraction from La0.7Sr0.3Mn0.9Fe0.1O3-Ξ΄, the activation energy of oxygen desorption has a minimum value (ΠΠ° = 103.7 kJ/mol at Ξ΄ = 0.005) and as the concentration of oxygen vacancies increases, it rises reaching saturation (ΠΠ° = 134.3 kJ/mol at Ξ΄ = 0.06). It is assumed that with an increase in the concentration of oxygen vacancies, an interaction occurs between them, followed by the processes of their ordering with the formation of associates.ΠΠ° ΠΎΡΠ½ΠΎΠ²Π°Π½ΠΈΠΈ Π΄Π°Π½Π½ΡΡ
ΡΠ΅ΡΠΌΠΎΠ³ΡΠ°Π²ΠΈΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π°Π½Π°Π»ΠΈΠ·Π° ΡΠ°ΡΡΡΠΈΡΠ°Π½Ρ Π·Π½Π°ΡΠ΅Π½ΠΈΡ ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π½ΠΎΠ³ΠΎ ΠΈΠ½Π΄Π΅ΠΊΡΠ° (3βΞ΄) Π² ΠΌΠ°Π½Π³Π°Π½ΠΈΡΠ΅ ΡΠΎΡΡΠ°Π²Π° La0,7Sr0,3Mn0,9Fe0,1O3-Ξ΄, ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ ΡΠ²Π΅ΡΠ΄ΠΎΡΠ°Π·Π½ΡΡ
ΡΠ΅Π°ΠΊΡΠΈΠΉ. ΠΡΠΈ Π°Π½Π°Π»ΠΈΠ·Π΅ ΠΊΡΠΈΠ²ΡΡ
ΡΠΎΡΠ±ΡΠΈΠΈ-Π΄Π΅ΡΠΎΡΠ±ΡΠΈΠΈ ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π° ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ ΠΏΡΠΎΡΠ΅ΡΡΡ Π²ΡΠ΄Π΅Π»Π΅Π½ΠΈΡ ΠΈ ΠΏΠΎΠ³Π»ΠΎΡΠ΅Π½ΠΈΡ ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π° ΠΏΡΠΈ ΠΏΠ°ΡΡΠΈΠ°Π»ΡΠ½ΠΎΠΌ Π΄Π°Π²Π»Π΅Π½ΠΈΠΈ pO2 = 10 ΠΠ° ΠΈ 400 ΠΠ° Π½Π΅ ΡΠ²Π»ΡΡΡΡΡ ΠΎΠ±ΡΠ°ΡΠΈΠΌΡΠΌΠΈ. ΠΠΈΠ½ΠΈΠΌΡΠΌΡ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄Π½ΠΎΠΉ dΞ΄/dt = f(T), ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΡΡΠΈΠ΅ ΠΌΠ°ΠΊΡΠΈΠΌΡΠΌΠ°ΠΌ ΡΠΊΠΎΡΠΎΡΡΠΈ Π²ΡΠ΄Π΅Π»Π΅Π½ΠΈΡ ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π°, ΡΠ²ΠΈΠ΄Π΅ΡΠ΅Π»ΡΡΡΠ²ΡΡΡ ΠΎ ΡΠ»ΠΎΠΆΠ½ΠΎΠΌ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠ΅ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ ΡΠΊΠΎΡΠΎΡΡΠΈ Π΄Π΅ΡΠΎΡΠ±ΡΠΈΠΈ ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π° ΠΈΠ· ΠΌΠ°Π½Π³Π°Π½ΠΈΡΠ°. Π£ΠΌΠ΅Π½ΡΡΠ΅Π½ΠΈΠ΅ ΡΠΊΠΎΡΠΎΡΡΠΈ Π½Π°Π³ΡΠ΅Π²Π° ΠΈ ΠΎΡ
Π»Π°ΠΆΠ΄Π΅Π½ΠΈΡ ΠΎΡ 6,6 Π΄ΠΎβ2,6βΠ/ΠΌΠΈΠ½ ΠΏΡΠΈΠ²Π΅Π»ΠΎ ΠΊ ΡΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠΌΡ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ Π·Π½Π°ΡΠ΅Π½ΠΈΡ βΞ΄, ΡΡΠΎ ΡΠΊΠ°Π·ΡΠ²Π°Π΅Ρ Π½Π° Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΡ ΠΏΠΎΠ΄Π²ΠΈΠΆΠ½ΠΎΡΡΠΈ Π°Π½ΠΈΠΎΠ½ΠΎΠ² ΠΎΡ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΠΈ ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π° Π² ΡΡΡΡΠΊΡΡΡΠ΅ ΠΌΠ°Π³Π½Π΅ΡΠΈΠΊΠ°. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ Π² ΠΌΠ°Π½Π³Π°Π½ΠΈΡΠ΅ La0,7Sr0,3Mn0,9Fe0,1O3-Ξ΄ ΠΊΠΈΠ½Π΅ΡΠΈΠΊΠ° Π΄Π΅ΡΠΎΡΠ±ΡΠΈΠΈ ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π° Ρ
ΠΎΡΠΎΡΠΎ ΠΎΠΏΠΈΡΡΠ²Π°Π΅ΡΡΡ ΡΠΊΡΠΏΠΎΠ½Π΅Π½ΡΠΈΠ°Π»ΡΠ½ΠΎΠΉ Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΡΡ ΠΏΠΎ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΠΡΠ°ΠΌΠ΅ΡΡΠ°, ΠΊΠΎΡΠΎΡΠ°Ρ ΠΏΠΎΠ΄ΡΠ°Π·ΡΠΌΠ΅Π²Π°Π΅Ρ ΠΎΡΡΡΡΡΡΠ²ΠΈΠ΅ Π²ΠΎΠ·Π²ΡΠ°ΡΠ΅Π½ΠΈΡ Π΄Π΅ΡΠΎΡΠ±ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π° Π² ΠΎΠ±ΡΠ°Π·Π΅Ρ. ΠΠ°Π½Π½Π°Ρ ΠΌΠΎΠ΄Π΅Π»Ρ ΡΠΊΠ°Π·ΡΠ²Π°Π΅Ρ Π½Π° Π½Π΅ΡΡΠ°ΡΠΈΠΎΠ½Π°ΡΠ½ΠΎΡΡΡ Π΄ΠΈΡΡΡΠ·ΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΏΠΎΡΠΎΠΊΠ° ΡΠ΅ΡΠ΅Π· Π±Π°ΡΡΠ΅Ρ ΠΏΡΠΈ Π΄Π΅ΡΠΎΡΠ±ΡΠΈΠΈ ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π° ΠΈΠ· ΠΎΠ±ΡΠ°Π·ΡΠΎΠ². ΠΡΠΎΠ²Π΅Π΄Π΅Π½Π½ΡΠΉ ΡΠ°ΡΡΠ΅Ρ ΡΠ½Π΅ΡΠ³ΠΈΠΈ Π°ΠΊΡΠΈΠ²Π°ΡΠΈΠΈ Π΄Π΅ΡΠΎΡΠ±ΡΠΈΠΈ ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π° ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ ΠΠ΅ΡΠΆΠ°Π½ΠΎΠ²Π° ΠΏΡΠΈ ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΠΏΠ°ΡΡΠΈΠ°Π»ΡΠ½ΡΡ
Π΄Π°Π²Π»Π΅Π½ΠΈΡΡ
ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π° ΠΏΠΎΠΊΠ°Π·Π°Π», ΡΡΠΎ Π½Π° Π½Π°ΡΠ°Π»ΡΠ½ΠΎΠΌ ΡΡΠ°ΠΏΠ΅ Π²ΡΠ΄Π΅Π»Π΅Π½ΠΈΡ ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π° ΠΈΠ· La0,7Sr0,3Mn0,9Fe0,1O3-Ξ΄ ΡΠ½Π΅ΡΠ³ΠΈΡ Π°ΠΊΡΠΈΠ²Π°ΡΠΈΠΈ Π΄Π΅ΡΠΎΡΠ±ΡΠΈΠΈ ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π° ΠΈΠΌΠ΅Π΅Ρ ΠΌΠΈΠ½ΠΈΠΌΠ°Π»ΡΠ½ΠΎΠ΅ Π·Π½Π°ΡΠ΅Π½ΠΈΠ΅ (ΠΠ° = 103,7 ΠΊΠΠΆ/ΠΌΠΎΠ»Ρ ΠΏΡΠΈ Ξ΄ = 0,005) ΠΈ ΠΏΠΎ ΠΌΠ΅ΡΠ΅ ΡΠ²Π΅Π»ΠΈΡΠ΅Π½ΠΈΡ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΠΈ ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π½ΡΡ
Π²Π°ΠΊΠ°Π½ΡΠΈΠΉ ΠΎΠ½Π° ΡΠ²Π΅Π»ΠΈΡΠΈΠ²Π°Π΅ΡΡΡ Ρ Π²ΡΡ
ΠΎΠ΄ΠΎΠΌ Π½Π° Π½Π°ΡΡΡΠ΅Π½ΠΈΠ΅ (ΠΠ° = 134,3 ΠΊΠΠΆ/ΠΌΠΎΠ»Ρ ΠΏΡΠΈ Ξ΄ = 0,06). Π‘Π΄Π΅Π»Π°Π½ΠΎ ΠΏΡΠ΅Π΄ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½ΠΈΠ΅, ΡΡΠΎ Ρ ΡΠ²Π΅Π»ΠΈΡΠ΅Π½ΠΈΠ΅ΠΌ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΠΈ ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π½ΡΡ
Π²Π°ΠΊΠ°Π½ΡΠΈΠΉ ΠΏΡΠΎΠΈΡΡ
ΠΎΠ΄ΠΈΡ Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΠ΅ ΠΌΠ΅ΠΆΠ΄Ρ Π½ΠΈΠΌΠΈ Ρ ΠΏΠΎΡΠ»Π΅Π΄ΡΡΡΠΈΠΌ ΠΏΡΠΎΡΠ΅ΠΊΠ°Π½ΠΈΠ΅ΠΌ ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ² ΠΈΡ
ΡΠΏΠΎΡΡΠ΄ΠΎΡΠ΅Π½ΠΈΡ Ρ ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ Π°ΡΡΠΎΡΠΈΠ°ΡΠΎΠ²
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