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10 results on '"polarization experiment"'

1. Influence of the Microstructure on the Corrosion Behavior of Brazed Al-layers

Author

Tan, Yuan (author) and Tan, Yuan (author)

Abstract

Aluminium alloy is widely used in the industry, while aluminium brazing sheets are mainly applied in heat-exchanger. The corrosion mechanism and corrosion behaviors have been studied in recent years. The aim of this thesis is to explore the difference of corrosion performance and microstructure at the distinguished regions in two specific systems - alloy FAB913 and alloy 8125. The samples were etched by GDOES sputtering in order to evaluate the corrosion performance at different depths. Electrochemical and SKPFM experiments were carried out to elucidate the differences in corrosion rate and surface potential. Furthermore, the microstructure changes after corrosion were observed by SEM analysis. The results indicate that the re-solidified clad surface was susceptible to localized corrosion attack while the heat affected area and diffusion zone show good corrosion performance. Furthermore, the Cu- and Si- content played a crucial role in the corrosion resistance of the alloys., Materials Science and Engineering

Published
2020

2. MAGNETIC MOMENT OPERATOR OF NON-DIRAC PARTICLES AND SOME ELEMENTS OF POLARIZATION ep-EXPERIMENTS.

Author

SLAD, L. M.

Subjects
*MAGNETIC moments, *OPTICAL polarization, *MATHEMATICAL models, *DIRAC function, *MAGNETIC fields, *PROTON scattering, *PHYSICS experiments
Abstract

An explicit form of the magnetic moment tensor operator for non-Dirac particles with rest spin-1/2 and its essential difference from the spin operator are established. Possible consequences of the last fact for the description of the spin rotation in the magnetic field and for the values of magnetic moments of some nuclei, as well as the impact of this and other facts on the validity of modeling the azimuthal asymmetry of the secondary-scattered protons in polarization ep-experiments are noted. [ABSTRACT FROM AUTHOR]

Published
2013
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3. Reassessment of conventional polarization technique to measure partial electronic conductivity of electrolytes

Author

Lee, Kyung-Ryul, Lee, Jong-Ho, and Yoo, Han-Ill

Subjects
*POLARIZATION (Electricity), *CONDUCTIVITY of electrolytes, *ELECTRODES, *OXIDES, *MOLECULAR probes, *ESTIMATION theory, *SOLID oxide fuel cells
Abstract

Abstract: Two-probe Hebb–Wagner polarization technique has been widely used to determine the partial electronic conductivity of an ionic conductor. The crucial, but often ignored pre-requisite with this technique is that the electronic over-potential at the electrodes be small enough to be neglected. In our own earlier experiences, however, this pre-requisite is not always true. In this study, we constructed a noble, 4-probe polarization cell, which allows measuring the true partial electronic conductivity without any electrode over-potential problem. We applied this new technique to 10m/o Gd-doped CeO2 (GDC) and compared the results with those from the conventional 2-probe technique. According to the comparison, electronic conductivity of GDC from 2-probe technique is always underestimated by 2–3 times while the 4-probe technique has turned out to be in perfect agreement with the estimated value from the total conductivity in its exclusively n-type regime. In this study we will report the experimental details of this noble 4-probe polarization technique as well as its viability in partial conductivity measurement. [Copyright &y& Elsevier]

Published
2010
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4. Spin rotation as an element of polarization experiments on elastic electron–proton scattering

Author

Slad, Leonid M.

Abstract

Abstract: The validity of some rules in the classical theory of spin, which are followed by the Bargmann–Michel–Telegdi formula for a relativistic particle spin rotation in a constant homogeneous magnetic field, is analyzed. In the framework of the quantum theory, we give examples where these rules are violated. Consequences for polarization experiments are discussed. [Copyright &y& Elsevier]

Published
2010
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5. The gas depletion factor in galaxy clusters: implication from Atacama Cosmology Telescope Polarization experiment measurements

Author

Tonghua Liu, Shuo Cao, Marek Biesiada, Sylwia Miernik, Jingzhao Qi, Xiaogang Zheng, and Zong-Hong Zhu

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), Physics and Astronomy (miscellaneous), FOS: Physical sciences, lcsh:Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Computer Science::Digital Libraries, 01 natural sciences, lcsh:QB460-466, 0103 physical sciences, Cluster (physics), lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010303 astronomy & astrophysics, Engineering (miscellaneous), Astrophysics::Galaxy Astrophysics, Galaxy cluster, Physics, COSMIC cancer database, 010308 nuclear & particles physics, Gas depletion, polarization experiment, Atacama Cosmology Telescope, Redshift, Baryon, lcsh:QC770-798, Mass fraction, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

The gas depletion factor $\gamma(z)$, i.e., the average ratio of the gas mass fraction to the cosmic mean baryon fraction of galaxy clusters, plays a very important role in the cosmological application of the gas mass fraction measurements. In this paper, using the newest catalog of 182 galaxy clusters detected by the Atacama Cosmology Telescope (ACT) Polarization experiment, we investigate the possible redshift evolution of $\gamma(z)$ through a new cosmology-independent method. The method is based on non-parametric reconstruction using the measurements of Hubble parameters from cosmic chronometers. Unlike hydrodynamical simulations suggesting constant depletion factor, our results reveal the trend of $\gamma(z)$ decreasing with redshift. This result is supported by a parametric model fit as well as by calculations on the reduced ACTPol sample and on the alternative sample of 91 SZ clusters reported earlier in ACT compilation. Discussion of possible systematic effects leaves an open question about validity of the empirical relation $M_{tot}$-$f_{gas}$ obtained on very close clusters. These results might pave the way to explore the hot gas fraction within large radii of galaxy clusters as well as its possible evolution with redshift, which should be studied further on larger galaxy cluster samples in the upcoming X-ray/SZ cluster surveys., Comment: 9 pages, 6 figures, 1 table. Comments welcome

Published
2019

6. Polarized targets and beams

Author

Meyer, W., Araki, H., editor, Ehlers, J., editor, Hepp, K., editor, Kippenhahn, R., editor, Weidenmüller, H. A., editor, Zittartz, J., editor, Beiglböck, W., editor, Menze, D., editor, Pfeil, W., editor, and Schwille, W. J., editor

Published
1985
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7. Polarization experiments

Author

Althoff, K.H., Ehlers, J., editor, Hepp, K., editor, Kippenhahn, R., editor, Weidenmüller, H. A., editor, Zittartz, J., editor, Beiglböck, W., editor, Arenhövel, Hartmuth, editor, and Saruis, Anna Maria, editor

Published
1981
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