Results 1 - 10 of 691
Results 1 - 10 of 691. Search took: 0.027 seconds
|Sort by: date | relevance|
[en] Highlights: • Capillary filling kinetics of deionized water in nanochannels with heights of 50–120 nm were studied. • The position of the moving meniscus was proportional to the square root of time, as predicted by the classical LW equation. • The extracted slopes were significantly smaller than the predictions based on the bulk properties. • This unusual behavior at nanoscale was found to be mainly caused by the electro-viscous effect and dynamic contact angle. We investigated the capillary filling kinetics of deionized water in nanochannels with heights of 50–120 nm. The measured position of the moving meniscus was proportional to the square root of time, as predicted by the LW equation. However, the extracted slopes were significantly smaller than the predictions based on the bulk properties. This unusual behavior was found to be mainly caused by the electro-viscous effect and dynamic contact angle, which was significantly larger than the static angle. In addition, when the filling distance reached about 600 μm, bubbles tended to be formed, leading to the main meniscus was almost immobile.
[en] A measure of complexity for sequentially created symbolic patterns is introduced. The underlying grammatical rules are systematically detected in terms of variable-length prefix-free codewords and arranged on a 'logic' tree. Predictions on the scaling structure of the system are then formulated and compared with the observation. The discrepancy between the two, evaluated through a generalisation of the information gain, characterises the complexity of the system, relative to the unfolding scheme. (author) 1 fig., 20 refs
[en] The creep behavior and deciding factors for creep life have been investigated for Gr.91 in the temperature range between 450 and 725 C. The longest time to rupture was 68755 h. The creep life is inversely proportional to the minimum creep rate multiplied by the increase in creep rate by strain in the acceleration region for a wide range of test temperature and duration. The minimum creep rate depends on both the time to minimum creep rate and the strain to minimum creep rate. The strain to minimum creep rate decreases with decreasing stress, suggesting that the creep deformation in the transient region is significantly inhomogeneous at low stresses. The creep life is correlated with the creep deformation parameters in the transient region so that we can predict the creep life from a short-term creep test for up to the end of transient region, corresponding to less than 30 % of the creep life, without any stress extrapolation. (orig.)
[en] A critical analysis of the Mackay formulation was presented. Most models which simulate the behaviour and trajectory of oil spills on water use the Mackay formulation which predicts the time evolution of the oil surface area. These authors proposed a correction to the oil spreading formulation that takes into account the oil and water physical properties in the Mackay constants, Ak and Bk. It was shown that these Mackay constants are not universal. They are also variable, depending on the oil and water physical properties. The corrected formulation was tested in laboratory experiments with samples from 34 different oil spills. The revised formulation gave more realistic results than the original Mackay formulation. 7 refs., 4 figs
[en] Based on the results of calculating simplified zone structure of element atoms in the condensed state and using the statistical regression method of analysis, a possibility of computing physico-chemical properties of elements of the Periodic System from electronic structures has been shown
[en] Average spectral acceleration, AvgSA, is defined as the geometric mean of spectral acceleration values over a range of periods and it is a ground motion intensity measure used for structural response prediction. One of its advantages stands on the assumption that its distribution is computable from the available GMPEs for spectral acceleration, GMPE-SA, (called here indirect method) without the need for deriving new specific GMPEs for AvgSA, GMPE-AvgSA, (called here direct method). To what extent this assumption is valid, however, has never been verified. As such, we derived an empirical GMPE-AvgSA based on RESORCE ground motion dataset and we compared its predicted values with those from a GMPE-SA via the indirect approach. As expected, the results show that the indirect approach yields median AvgSA estimates that are identical to those of the direct approach. However, the estimates of AvgSA variance of the two methods are identical only if both the GMPE-SA and their empirical correlation coefficients among different SA ordinates are derived from the same record dataset.
[en] We show that dimensionful renormalization parameters such as the renormalization or factorization scale can be completely eliminated from perturbative QCD predictions provided that all the ultraviolet logarithms involving the physical energy scale Q are completely resumed
[en] Calorimetry allows very precise measurements of nuclear material to be carried out, but it also requires relatively long measurement times to do so. The ability to accurately predict the equilibrium response of a calorimeter would significantly reduce the amount of time required for calorimetric assays. An algorithm has been developed that is effective at predicting the equilibrium response. This multi-exponential prediction algorithm is based on an iterative technique using commercial fitting routines that fit a constant plus a variable number of exponential terms to calorimeter data. Details of the implementation and the results of trials on a large number of calorimeter data sets will be presented
[en] Background/Objectives: Equations for predicting body composition are population-specific. The aim of this study is to cross-validate prediction equations previously published for the prediction of body composition using the deuterium oxide dilution (D2O) technique.