185 research outputs found
Mining waste utilization in the production of building materials
Possibilities of utilization of Olenegorsk iron ore deposit and Khibiny apatite-nepheline ore deposit overburden rocks (Kola Peninsula, Russia) in the production of building materials have been considered. It has been shown that overburden rocks minerals, particularly nepheline, chemically react with cement phase thereby consolidating the contact zone. According to the obtained results the overburden rocks can be used in road building, civil and industrial engineering
Utilization of ferrous-magnesium slag for production of binding materials
Utilization of Pechenganickel, Severonickel and Norilsk Nickel smelter plants ferrous-magnesium slag for production of Portland slag cement, lime-slag cement and alkali-activated slag cement has been considered. Influence of mechanical activation of ferrous-magnesium slag, in air and in carbon dioxide atmosphere, on its binding properties has been studied. It has been shown that preliminary mechanical activation in CO2 results in an increase of compressive strength of alkali-activated slag cement. Interaction between mechanically activated slag and liquid glass has been characterized using SEM and microprobe technique
[Review] Biographical Dictionary of the Social Movements in Modern Japan
© 2012, Pleiades Publishing, Ltd. Variations in the atmospheric integrated water vapor obtained from the phase measurement by satellite navigation systems’ receivers are discussed. The comparison between numerical weather reanalysis fields and solar photometer measurements has shown an agreement with a relative deviation of less than 10%. Intraseasonal processes of 3–45 days in length significantly contribute to variations in the atmospheric integrated water vapor; their amplitude is 1–4 kg/m2. Variations with periods from 3 to 10 days are the most frequent
Variations in the atmospheric integrated water vapor from phase measurements made with receivers of satellite navigation systems
© 2012, Pleiades Publishing, Ltd. Variations in the atmospheric integrated water vapor obtained from the phase measurement by satellite navigation systems’ receivers are discussed. The comparison between numerical weather reanalysis fields and solar photometer measurements has shown an agreement with a relative deviation of less than 10%. Intraseasonal processes of 3–45 days in length significantly contribute to variations in the atmospheric integrated water vapor; their amplitude is 1–4 kg/m2. Variations with periods from 3 to 10 days are the most frequent
Variability of GPS-derived zenith tropospheric delay and some result of its assimilation into numeric atmosphere model
The total zenith tropospheric delay (ZTD) is an important parameter of the atmo- sphere and directly or indirectly reflects the weather processes and variations. This paper presents a hardware and software complex for continuous measurements and prediction of atmospheric thermodynamics and radiowaves refraction index. The main part is a network of ground-based spatially separated GPS-GLONASS receivers, which allows the remote sensing zenith tropo- spheric delay. GPS-Derived Zenith Tropospheric Delay shows the day to day variation and mesoscale spatial and temporal variability. Comparison with the numerical weather reanalysis fields and solar photometer measurements showed agreement with the relative deviation of less than 10%. Hardware-software complex includes the numerical model of the atmosphere on a computational cluster. A variational assimilation system was used to examine the comparative impact of including satellite derived total zenith tropospheric delay from GPS and GLONASS ground observations. Preliminary results show that the initial field of radiowaves refraction index was improved by assimilating the satellite derived ZTD
PEN: a low energy test of lepton universality
Allowed charged meson decays are characterized by simple dynamics, few
available decay channels, mainly into leptons, and extremely well controlled
radiative and loop corrections. In that sense, pion decays represent a
veritable triumph of the standard model (SM) of elementary particles and
interactions. This relative theoretical simplicity makes charged pion decays a
sensitive means for testing the underlying symmetries and the universality of
weak fermion couplings, as well as for studying pion structure and chiral
dynamics. Even after considerable recent improvements, experimental precision
is lagging far behind that of the theoretical description for pion decays. We
review the current state of experimental study of the pion electronic decay
, or , where the
indicates inclusion and explicit treatment of radiative decay events. We
briefly review the limits on non-SM processes arising from the present level of
experimental precision in decays. Focusing on the PEN
experiment at the Paul Scherrer Institute (PSI), Switzerland, we examine the
prospects for further improvement in the near term.Comment: 11 pages, 5 figures; paper presented at the XIII International
Conference on Heavy Quarks and Leptons, 22-27 May 2016, Blacksburg, Virginia,
US
PEN experiment: a precise measurement of the pi+ -> e+ nu decay branching fraction
A new measurement of , the decay
branching ratio, is currently under way at the Paul Scherrer Institute. The
present experimental result on constitutes the most accurate test
of lepton universality available. The accuracy, however, still lags behind the
theoretical precision by over an order of magnitude. Because of the large
helicity suppression of the decay, its branching ratio is
susceptible to significant contributions from new physics, making this decay a
particularly suitable subject of study.Comment: 4 pages, 3 figures, talk given at the Tenth Conference on the
Intersections of Particle and Nuclear Physics (CIPANP 2009), La Jolla/San
Diego, CA, 26-31 May 2009; to appear in Proceedings to be published by the
American Institute of Physic
Spin physics with antiprotons
New possibilities arising from the availability at GSI of antiproton beams,
possibly polarised, are discussed. The investigation of the nucleon structure
can be boosted by accessing in Drell-Yan processes experimental asymmetries
related to cross-sections in which the parton distribution functions (PDF) only
appear, without any contribution from fragmentation functions; such processes
are not affected by the chiral suppression of the transversity function
. Spin asymmetries in hyperon production and Single Spin Asymmetries
are discussed as well, together with further items like electric and magnetic
nucleonic form factors and open charm production. Counting rates estimations
are provided for each physical case. The sketch of a possible experimental
apparatus is proposed.Comment: Presented for the proceedings of ASI "Spin and Symmetry", Prague,
July 5-10, 2004, to be published in Czech. J. Phys. 55 (2005
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