Zobrazeno 1 - 10
of 32
pro vyhledávání: '"T. W. Capehart"'
Autor:
Gavin Pereira, Yang-Tse Cheng, David Munoz-Paniagua, Andreas Lachenwitzer, Masoud Kasrai, Thomas A. Perry, T. W. Capehart, Peter R. Norton
Publikováno v:
Tribology - Materials, Surfaces & Interfaces. 1:4-17
The interaction of a friction modifier and a calcium phenate detergent additive, with zinc dialkyl dithiophosphates (ZDDPs) in the formation of antiwear films on A383, has been studied using synchrotron radiation and nanoindentation techniques. X-ray
Autor:
Thomas A. Perry, Masoud Kasrai, Gavin Pereira, Yang-Tse Cheng, B. H. Frazer, Andreas Lachenwitzer, Pupa U. P. A. Gilbert, T. W. Capehart, Peter R. Norton
Publikováno v:
Tribology Letters. 26:103-117
The simulation of the lubrication of aluminum–silicon (Al–Si) alloy cylinder-bore conditions is an important goal in automotive tribology. This study describes the use of X-ray absorption near edge structure (XANES) to determine the macro-chemist
Publikováno v:
Tribology Transactions. 49:454-472
The traction fluid is a critical component of a toroidal-continuously variable transmission (T-CVT). As the medium that transmits power through the toroids, the traction fluid needs to provide a high traction coefficient and retain low dynamic viscos
Publikováno v:
Journal of Alloys and Compounds. 353:74-85
Density functional calculations of the electronic structure and enthalpy of formation Δ H of LaNi 5 and LaNi 5 H 7 are reported. Single-crystal elastic constants and Voigt–Reuss–Hill polycrystalline moduli were calculated for both materials usin
Autor:
T. W. Capehart, Yang-Tse Cheng
Publikováno v:
Journal of Materials Research. 18:827-832
Several procedures have previously been advanced for extracting constitutive relations from the force–displacement curves obtained from indentation. This work addresses the specific problem of determining the elastic modulus E, yield stress Y, and
Publikováno v:
Journal of Applied Physics. 85:1654-1657
We have fabricated magnetostrictive composites containing Sm1−xNdxFe2 in an Fe matrix by hot pressing. The magnetostrictive component was prepared by heat treating melt-spun precursors, a method we find capable of producing the MgCu2-type phase for
Autor:
Gregory P. Meisner, T. W. Capehart, J. F. Herbst, R. K. Mishra, C. D. Fuerst, Frederick E. Pinkerton
Publikováno v:
Physical Review B. 55:11496-11501
In ${\mathrm{Ce}}_{2}$${\mathrm{Fe}}_{14}$B and ${\mathrm{Ce}}_{2}$${\mathrm{Fe}}_{17}$, cerium is mixed valent and nonmagnetic. Any structural or compositional modification of these intermetallics which induces cerium to become trivalent and develop
Publikováno v:
Physical Review B. 52:7907-7914
Publikováno v:
Journal of Magnetism and Magnetic Materials. 139:359-363
Pseudoternary La2-xCexFe14B compounds having the tetragonal Nd2Fe14B crystal structure have been prepared over the entire 0≤x≤2 composition range. With appropriate heat treatment schedules, samples which were single-phase or nearly so were obtain
Publikováno v:
Journal of Applied Physics. 72:676-679
Using x‐ray‐absorption near‐edge spectroscopy (XANES) the Pr valence in the pseudoternary Pr2(CoxFe1−x)14B compounds has been directly determined. Praseodymium LIII edge XANES structures were obtained for the x=0, 0.3, 0.5, 0.7, and 1 composi