5,182 research outputs found
Tuning phase-stability and short-range order through Al-doping in (CoCrFeMn)100-xAlx high entropy alloys
For (CoCrFeMn)Al high-entropy alloys, we investigate the
phase evolution with increasing Al-content (0 x 20 at.%). From
first-principles theory, the Al-doping drives the alloy structurally from FCC
to BCC separated by a narrow two-phase region (FCC+BCC), which is well
supported by our experiments. We highlight the effect of Al-doping on the
formation enthalpy and electronic structure of (CoCrFeMn)Al
alloys. As chemical short-range order (SRO) in multicomponent alloys indicates
the nascent local order (and entropy changes), as well as expected
low-temperature ordering behavior, we use thermodynamic linear-response within
density-functional theory to predict SRO and ordering transformation and
temperatures inherent in (CoCrFeMn)Al. The predictions agree
with our present experimental findings, and other reported ones.Comment: 27 pages, 9 figures, 1 tabl
Hecke Transformations of Conformal Blocks in WZW Theory. I. KZB Equations for Non-Trivial Bundles
We describe new families of the Knizhnik-Zamolodchikov-Bernard (KZB)
equations related to the WZW-theory corresponding to the adjoint -bundles of
different topological types over complex curves of genus
with marked points. The bundles are defined by their characteristic classes
- elements of , where is a
center of the simple complex Lie group . The KZB equations are the
horizontality condition for the projectively flat connection (the KZB
connection) defined on the bundle of conformal blocks over the moduli space of
curves. The space of conformal blocks has been known to be decomposed into a
few sectors corresponding to the characteristic classes of the underlying
bundles. The KZB connection preserves these sectors. In this paper we construct
the connection explicitly for elliptic curves with marked points and prove its
flatness
An Assessment of Policy Measures to Support Russia's Real Economy
"This paper presents the results of an analytical project on the design and approbation of methodology for assessing and monitoring the measures taken by the government of the Russian Federation in response to the recent worldwide fiscal crisis. The paper is based on our analysis of about 100 measures initiated between October 2008 and March 2009 to support Russia's real economy. Within the scope of this analysis, we singled out the main beneficiaries according to industry and enterprise scale, and estimated the effects of the measures during the crisis and recovery phases. The paper also describes the major risks the Russian government will face as a result of implementing the aforementioned measures
and identifies the key problems and inconsistencies of the anti-crisis programme." (author's abstract
Localization of possible functional domains in sup2 gene product of the yeast Saccharomyces cerevisiae
AbstractPrimary structures of yeast sup2 gene and polypeptide product coded by the gene are compared with the current nucleotide and amino acid sequence data base. The amino acid sequence of the sup2 product shows homology to elongation factors from different sources. Especially high homology is found in the regions, corresponding to conservative aminoacyl-tRNA- and GTP-binding domains, described in elongation factors and other proteins. The data obtained are discussed in relation to the functions of sup2 polypeptide product in protein synthesis
Chayandinskoye field is the project of new technologies implementation in East Siberia
Modern level of study of structure of Chayandinskoye oil and gas condensate field is characterized by implementation of 3D seismic survey, carried out using a rich azimuth seismic survey system with a fold of 240. Complex seismic and geological conditions within this part of Eastern Siberia dictate high requirements to quality of field 3D seismic operations. A geological section of an area of operations is characterized by Lower Proterozoic formations of crystalline basement and Vendian, Cambrian, Jurassic, Quaternary deposits of the sedimentary cover. The main role in structure of the sedimentary cover is played by clastic and carbonate deposits of Vendian and halogen-carbonate formations of Cambrian Period. Productive part of a section refers to Botuobinsk, Khamakin and Talakh suits and is characterized by a very complex structure of natural reservoirs. Study of productive section structure is caused by need to prepare a field for production drilling and its subsequent development. In order to reveal features of structure of productive part of a section in a region with complex seismic and geological conditions, migration is used up to the summation in the deep region. Wide-azimuth observation system is aimed to study the most important challenges of medium structure such as direction and nature of change in fracture, study of azimuthal anisotropy of velocity characteristics of section and identification of characteristics of elastic properties change. Base technologies to study anisotropy of geological section properties are adapted and introduced into seismic exploration technique. They are as follows: 1) a method based on study of geometric attributes; 2) azimuthal analysis of velocities; 3) azimuth AVO-analysis (AVAZ); 4) anisotropic inversion. Based on results of processing and complex interpretation of seismic data of MOGT-3D works at the Chayandinskoye oil and gas condensate field the most important information about geological structure of sedimentary cover deposits and productive section was obtained. That allowed to significantly clarifying concept of structure of productive formations and geological development of this area. It also allowed determining distribution of reservoirs and evaluating reserves with considered new built structural and tectonic model
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