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Search Results: 1 - 10 of 409585 matches for " Vladimir M. Novikov "
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Development of a Gd Loaded Liquid Scintillator for Electron Anti-Neutrino Spectroscopy
Andreas G. Piepke,S. Wayne Moser,Vladimir M. Novikov
Physics , 1999, DOI: 10.1016/S0168-9002(99)00530-6
Abstract: We report on the development and deployment of 11.3 tons of 0.1% Gd loaded liquid scintillator used in the Palo Verde reactor neutrino oscillation experiment. We discuss the chemical composition, properties, and stability of the scintillator elaborating on the details of the scintillator preparation crucial for obtaining a good scintillator quality and stability.
Generalisations of the Camassa-Holm equation
Vladimir Novikov
Physics , 2009,
Abstract: We classify generalised Camassa-Holm type equations which possess infinite hierarchies of higher symmetries. We show that the obtained equations can be treated as negative flows of integrable quasi-linear scalar evolution equations of orders 2, 3 and 5. We present the corresponding Lax representations or linearisation transformations for these equations. Some of the obtained equations seem to be new.
On problem of polarization tomography, I
Roman Novikov,Vladimir Sharafutdinov
Physics , 2007, DOI: 10.1088/0266-5611/23/3/023
Abstract: The polarization tomography problem consists of recovering a matrix function f from the fundamental matrix of the equation $D\eta/dt=\pi_{\dot\gamma}f\eta$ known for every geodesic $\gamma$ of a given Riemannian metric. Here $\pi_{\dot\gamma}$ is the orthogonal projection onto the hyperplan $\dot\gamma^{\perp}$. The problem arises in optical tomography of slightly anisotropic media. The local uniqueness theorem is proved: a $C^1$- small function f can be recovered from the data uniquely up to a natural obstruction. A partial global result is obtained in the case of the Euclidean metric on $R^3$.
On Classification of Integrable Davey-Stewartson Type Equations
Benoit Huard,Vladimir Novikov
Physics , 2013, DOI: 10.1088/1751-8113/46/27/275202
Abstract: This paper is devoted to the classification of integrable Davey-Stewartson type equations. A list of potentially deformable dispersionless systems is obtained through the requirement that such systems must be generated by a polynomial dispersionless Lax pair. A perturbative approach based on the method of hydrodynamic reductions is employed to recover the integrable systems along with their Lax pairs. Some of the found systems seem to be new.
Creation of a homogeneous plasma column by means of hohlraum radiation for ion-stopping measurements
Steffen Faik,Anna Tauschwitz,Mikhail M. Basko,Joachim A. Maruhn,Olga Rosmej,Tim Rienecker,Vladimir G. Novikov,Alexander S. Grushin
Physics , 2013, DOI: 10.1016/j.hedp.2013.10.002
Abstract: In this work, we present the results of two-dimensional radiation-hydrodynamics simulations of a hohlraum target whose outgoing radiation is used to produce a homogeneously ionized carbon plasma for ion-beam stopping measurements. The cylindrical hohlraum with gold walls is heated by a frequency-doubled ($\lambda_l = 526.5$ $\mu m$) $1.4$ $ns$ long laser pulse with the total energy of $E_l = 180$ $J$. At the laser spot, the peak matter and radiation temperatures of, respectively, $T \approx 380$ $eV$ and $T_r \approx 120$ $eV$ are observed. X-rays from the hohlraum heat the attached carbon foam with a mean density of $\rho_C = 2$ $mg/cm^3$ to a temperature of $T \approx 25$ $eV$. The simulation shows that the carbon ionization degree ($Z \approx 3.75$) and its column density stay relatively stable (within variations of about $\pm7\%$) long enough to conduct the ion-stopping measurements. Also, it is found that a special attention should be paid to the shock wave, emerging from the X-ray heated copper support plate, which at later times may significantly distort the carbon column density traversed by the fast ions.
Interaction of Atoms with Grain Surfaces in Steel: Periodic Dependence of Binding Energy on Atomic Number and Influence on Wear Resistance  [PDF]
Yuri F. Migal, Vladimir I. Kolesnikov, Vladimir N. Doronkin, Evgeni S. Novikov
Advances in Materials Physics and Chemistry (AMPC) , 2012, DOI: 10.4236/ampc.2012.24030
Abstract:

Quantum-chemical calculations of polyatomic clusters simulating a boundary between grains in a surface layer of steel were carried out. Along with iron atoms the clusters contain atoms of alloying and impurity elements which appear on the boundary due to grain boundary segregation or intergrain diffusion. The influence of the chemical composition of a segregate on the strength of coupling between grains and, eventually, on steel wear resistance is analyzed. Results obtained show that the degree of the strength of binding of segregated atoms with atoms of iron in a metal surface layer is an essential factor influencing wear resistance. It is found that the dependence of energy of binding of atoms of different elements with grain surface on the atomic number complies with the periodic law. This fact can be considered as a theoretical base for the prognostication of strength properties of steel with different composition of alloying and impurity elements. Potential energy curves corresponding to the movement of atoms on iron surface are studied. They can be useful for design of the composition of multi-layer coats on steel.

Influence of hydro-meteorological factors on the work of port complexes of the astrakhan region
Novikov Vladimir Ivanovich,Bukharitsin Peter Ivanovich
Vestnik of Astrakhan State Technical University. Series: Marine Engineering and Technologies , 2009,
Abstract: Unsteadiness of climatic and hydrological factors badly influences the work of port complexes of the Astrakhan region, on the activity of all branches of the national economy of the whole North-Caspian region. It causes significant additional material expenses, both in warm and cold seasons. The results of eco-nomic, management and other decisions, taken on the grounds of hydro-meteorological information, are expressed not only by economic, but also social, ecological, organizing, scientific and technological effect, and it is particularly actual during the current financial-economic crisis.
Symmetry structure of integrable non-evolutionary equations
Vladimir S. Novikov,Jing Ping Wang
Physics , 2007,
Abstract: We study a class of evolutionary partial differential systems with two components related to second order (in time) non-evolutionary equations of odd order in spatial variable. We develop the formal diagonalisation method in symbolic representation, which enables us to derive an explicit set of necessary conditions of existence of higher symmetries. Using these conditions we globally classify all such homogeneous integrable systems, i.e. systems which possess a hierarchy of infinitely many higher symmetries.
File mapping Rule-based DBMS and Natural Language Processing
Vjacheslav M. Novikov
Computer Science , 2001,
Abstract: This paper describes the system of storage, extract and processing of information structured similarly to the natural language. For recursive inference the system uses the rules having the same representation, as the data. The environment of storage of information is provided with the File Mapping (SHM) mechanism of operating system. In the paper the main principles of construction of dynamic data structure and language for record of the inference rules are stated; the features of available implementation are considered and the description of the application realizing semantic information retrieval on the natural language is given.
CP violation in the models of fermion localization on a domain wall (brane)
Andrianov, Alexander A.;Andrianov, Vladimir A.;Novikov, Oleg O.
High Energy Physics - Phenomenology , 2013,
Abstract: A brief survey of fermion localization mechanism on a domain wall ("thick brane") generated by a topologically nontrivial vacuum configuration of scalar fields is given. The extension of scalar fields interaction with fermions which supplies fermions with an axial mass is proposed. For several flavors and generations of fermions this extension can entail the Cabibbo-Kobayashi-Maskawa matrix of the Standard Model. As well the model with two scalar doublets which provide a supplementary CP violation mechanism is considered.
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