Results 21 to 30 of about 484,828 (297)

Improved Calculation of Dynamic Load Capacity for Cylindrical Roller Thrust Bearings: Numerical Update of the Lifetime Reduction Factor η for Bearings with Small and Medium Spin-to-Roll Ratios

Lubricants
The standard procedures for calculating the lifetime of rolling bearings, defined by DIN ISO 281 and ISO/TS 16281, have been revisited in this work with a specific focus on redefining the η factor for cylindrical roller thrust bearings (CRTBs). The new η
Paul Sauvage, Torben Terwey, Benjamin Lehmann, Georg Jacobs   +3 more
doaj   +1 more source

Remaining Useful Life Estimation of Spindle Bearing Based on Bearing Load Calculation and Off-Line Condition Monitoring

Machines, 2023
Spindles are key components of machine tools. An efficient estimation of the spindle condition and its prognosis can improve production efficiency and quality due to predictive maintenance planning.
Jiri Sova, Petr Kolar, David Burian, Petr Vozabal   +3 more
doaj   +1 more source

Theory and it ab initio calculation of radiative lifetime of excitons in semiconducting carbon nanotubes

, 2005
We present theoretical analysis and first-principles calculation of the radiative lifetime of excitons in semiconducting carbon nanotubes. An intrinsic lifetime of the order of 10 ps is computed for the lowest optically active bright excitons.
A. Fetter, Catalin D. Spataru, R. Loudon, R. B. Weisman, Rodrigo B. Capaz, Sohrab Ismail-Beigi, Steven G. Louie   +6 more
core   +1 more source

PROBLEM RAISING: THE QUESTION OF DESIGN PROCEDURES DEPENDING ON THE COMPOSITION OF MIXTURES

Facta Universitatis. Series: Architecture and Civil Engineering
Different pavement structure design procedures have been carried out since 1960s in Hungary. The main principles of the most recent procedure were laid down in 1992 by Ervin Nemesdy, which was an empirical design guide.
Kornel Almassy, Domonkos Koch
doaj   +1 more source

On the Precise Determination of the Fermi Coupling Constant from the Muon Lifetime [PDF]

, 1999
The determination of the Fermi coupling constant, G_F, is examined in the light of recently calculated 2-loop QED corrections and planned experiments to measure the muon lifetime to a level below 1ppm.
Stuart, Robin G., van Ritbergen, Timo
core   +2 more sources

Cumulative Damage and Life Prediction Models for High-Cycle Fatigue of Metals: A Review

Metals, 2021
Fatigue design of engineering structures is typically based on lifetime calculation using a cumulative damage law. The linear damage rule by Miner is the universal standard for fatigue design even though numerous experimental studies have shown its ...
Kris Hectors, Wim De Waele
doaj   +1 more source

Direct calculation of the probability of pionium ionization in the target

, 2007
We performed the first direct calculation of the probability of pionium (pi+pi- atom) ionization in the target. The dependence of the probability of pionium ionization in the target as a function of the pionium lifetime is established. These calculations
B. Adeva, C. Santamarina, E. A. Kuraev, E. Anderson, G. Colangelo, H.-W. Hammer, J. Gasser, J. L. Uretsky, L. G. Afanasyev, L. L. Nemenov, M. Knecht, M. V. Zhabitsky, O. Voskresenskaya, S. M. Bilen’ky, Z. Halabuka   +14 more
core   +1 more source

Anomalous Quasiparticle Lifetime in Graphite: Band Structure Effects [PDF]

, 2001
We report ab initio calculation of quasiparticle lifetimes in graphite, as determined from the imaginary part of the self-energy operator within the GW aproximation.
A. A. Abrikosov, Angel Rubio, B. Holm, Catalin D. Spataru, D. Pines, E. L. Shirley, E. T. Jensen, F. Aryasetiawan, F. Bechstedt, H. J. Monkhorst, I. Campillo, I. Campillo, I. Campillo, J. González, J. González, J. González, J. S. Dolado, K. Ertel, L. Hedin, L. Hedin, L. Zheng, Lorin X. Benedict, M. S. Hybertsen, Miguel A. Cazalilla, N. Troullier, N. W. Ashcroft, P. M. Echenique, Pedro M. Echenique, R. Keyling, S. G. Louie, S. Xu, Steven G. Louie, W. D. Schone, W. Kohn   +33 more
core   +3 more sources

Lifetime calculations in energy levels of Kr vii

Journal of Physics Communications, 2017
Se presentan los cálculos de las vidas útiles para todos los niveles de energía experimentalmente conocidos del espectro del criptón seis veces ionizado (Kr vii). Se utilizó el método relativista de Hartree–Fock que incluye efectos de polarización del núcleo.
M. Raineri, J. Reyna Almandos, Eurico Vasco Amorim, J.O. Souza, E. E. Farias   +4 more
openaire   +2 more sources

Diffusion Simulation and Lifetime Calculation at RHIC [PDF]

, 2009
The beam lifetime is an important parameter for any storage ring. For protons in RHIC it is dominated by the non-linear nature of the head-on collisions that causes the particles to diffuse outside the stable area in phase space. In this report we show results from diffusion simulation and lifetime calculation for the 2006 and 2008 polarized proton ...
Abreu, N.P., Fischer, W., Luo, Y., Robert-Demolaize, G.   +3 more
openaire   +4 more sources