4,582 research outputs found
Probabilistic computational modeling of total knee replacement wear
No full textin both clinical retrieval and experimental wear studies. Recently, computational wear simulations have been shown to predict similar results to in
vitro and retrieval studies. The objectives of this study were to develop a probabilistic wear prediction model capable of incorporating uncertainty
in component alignment, constraint and environmental conditions, to compare computational predictions with experimental results from a knee
wear simulator, and to identify the most significant parameters affecting predicted wear performance during simulated gait. The current study
utilizes a previously verified wear model; the Archard’s law-based wear formulation represents a composite measure, incorporating the effects and
relative contributions of kinematics and contact pressure. Predicted wear was in reasonable agreement in trend and magnitude with experimental
results. After 5 million cycles, the predicted ranges (1–99%) of variability in linear wear penetration and gravimetric wear were 0.13mm and
25 mg, respectively, for the input variability levels evaluated. Using correlation-based sensitivity factors, the coefficient of friction, insert tilt and
femoral flexion–extension alignment, and the wear coefficient were identified as the parameters most affecting predicted wear. Comparisons of
stability, accuracy and efficiency for the Monte Carlo and advanced mean value (AMV) probabilistic methods are also described. The probabilistic
wear prediction model provides a time and cost efficient framework to evaluate wear performance, including considerations of malalignment and
variability, during the design phase of new implants
Reduced repetition rate Yb<sup>3+</sup> mode-locked picosecond fiber laser with hollow core fiber
No full textAnti-resonant guiding negative curvature hollow core fiber operating at a
wavelength of 1064 nm is used in the cavity of an ytterbium (Yb3+)
mode-locked fiber laser to increase cavity length without increasing
the nonlinear phase shift. Repetition rates from 37 to 5.4 MHz are
demonstrated using lengths of hollow core fiber up to 48 m in length.
Each constructed cavity produced coherent 4-ps 1/e2 duration
soliton-like pulses, with no degradation of the pulse peak power or
pulse shape at lower repetition rates. Both the spectral distributions
and the autocorrelations of output pulses are compared along with the
mode-locking and multi-pulse power thresholds
The effects of mis-alignment and background noise in a low energy gamma-ray telescope
No full textSIGLEAvailable from British Library Document Supply Centre- DSC:DX96932 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Past veterinarians in South Africa
No full textAn alphabetical list containing short biographies of all deceased South African veterinarians up to 1990.[compiled by] P.J. (Bill) PosthumusVolume 1: AL -- Volume 2: M-ZAlso available in print http://137.215.9.20/record=b1893606ab2013ab201
Open brief aan den WelEdel. Gestr. Heer P.J. Joubert
No full textleyds-70-7201.pdf created from original pamphlet in the WJ Leyds Collection held in the Africana Section of the Stellenbosch University Library and Information Service.Dutch open letter to P.J. Joubert concerning a railroad concession granted to the author and two of his friends in 1885
Design, Modeling and Simulation of a 52MHz MEMS Gyroscope Device in 1.5um SOI
No full textIn this thesis , a simulation model of a MEMS gyroscope is presented. The model enables mode matching and analysis of the dynamic behavior of a gyroscope. Furthermore, the model allows the optimization the design parameters of the gyroscope. The simulated gyroscope operates at a frequency of 52MHz with amplitudes of 10nm and quality factor of 50,000. Finally, the drive mode measurements are presented at different bias voltages.Microelectronics & Computer EngineeringElectrical Engineering, Mathematics and Computer Scienc
Het gemeentelijk Investeringsraadsel: Het verband tussen gemeentelijke investeringen en lokale welvaartsontwikkeling
No full textDit proefschrift gaat over de vraag in hoeverre in Nederland de lokale welvaartsontwikkeling wordt bepaald door de gemeentelijke investeringsinspanning. Op project niveau is meestal wel het een en ander bekend over de maatschappelijke effecten, maar over de impact van de totale investeringsinspanning ontbreekt zowel fundamentele als toepasbare kennis. Het is een raadsel dat nog opgelost dient te worden. De doelstelling van dit proefschrift is daaraan een bijdrage te leveren.Housing System
Coupled thermo–hydro–mechanical processes for the Dutch radioactive waste repository
No full textDisposal of spent nuclear fuel and long lived radioactive waste in deep clay geological formations is one of the promising options worldwide. In this concept of the geological disposal system, the Boom Clay is considered as a potential host rock when designing a generic waste repository in the Netherlands. For design and evaluation of a repository for geologic disposal of nuclear wastes one of its principal concern is the thermal loading. High-level radioactive waste and spent fuel generate considerable amounts of heat. When those waste types are disposed in a geological repository the elevated thermal effect on the behaviour of soils surrounding nuclear waste disposal give rise to change in hydraulic and mechanical properties is a significant factor for repository design. Understanding these time-dependent phenomena processes in relation to both the effects of pore water dissipation and of the thermal expansion is essential for reliably assessing repository performance and evaluating the safety case. This paper presents some of the investigation on the thermal processes with emphasis on the coupled Thermo-Hydro- Mechanical (THM) processes for the disposal concept of a radioactive waste disposal facility, in Boom Clay at a depth of about 500m.Geo-engineerin
March 22, 1912 Page two If Teddy takes the stump County board proceedings New restaurant to start
No full textRoosevelt, Theodore, 1858-1919; Smith, George; Ackerson, P.J.; Eldridge, William; Hart, DeWitt; Knight, Claude; Lake, Lorena
- …
