Showing papers by "China University of Petroleum published in 1998"
TL;DR: A broad overview of the general area of polymer tribology is presented in this paper, where the progress in understanding the field over the past decade is reviewed under the three topics of rubber tribology, plastic tribology and tribology of polymer composites.
205 citations
TL;DR: In the Ordovician Majiagou Group in the Ordos area, North China Platform, this paper, the dolostones can be divided into four types: mud-sized to silt-sized crystalline dolomite crystals not associated with gypsum and halite beds (type I), mottled siltsized to fine sand-sized dolombite crystals (type II), coarse saccharoidal dolomeric dolomers (fine saccharionic dolomen), and coarse sand-size dolomines (co
29 citations
TL;DR: Carbon dioxide reforming with methane to synthesis gas has been investigated in terms of the effects of active metal loading, feed ratio, and reaction temperature on catalyst activity and stability as discussed by the authors, and the results showed that active metal load and feed ratio can significantly affect the performance of catalysts.
Abstract: Carbon dioxide reforming with methane to synthesis gas has been investigated in terms of the effects of active metal loading, feed ratio, and reaction temperature on catalyst activity and stability...
27 citations
Journal Article•
16 citations
TL;DR: In this paper, five fundamental types of gravity-flow limestones are recognized: slide limestones, debris-flow Limstones, grain flow limstones, turbidity-current limestones and rockfall limestones.
15 citations
TL;DR: Riazi and Daubert's correlations for predicting critical properties and molecular weights have been revised with an extended database as mentioned in this paper, and the results show reasonable improvement over previous correlations and show that the normal boiling points of the systems investigated range up to 418 °C.
Abstract: Riazi and Daubert's (Riazi, M. R.; Daubert, T. E. Hydrocarbon Process. 1980, 59, 115) correlations for predicting critical properties and molecular weights have been revised with an extended database. The normal boiling points of the systems investigated range up to 418 °C, and the specific gravities range up to 1.175. The results show reasonable improvement over previous correlations
10 citations
1 citations
TL;DR: In this article, a tensor product finite-element equation based on a variational form of Biot's SH-wave equations was derived. But the complexity of the algorithm was not reduced by complex methods of solving linear equations and the memory space required was of the order of magnitude of the variable vector used.
Abstract: Summary When a SH-wave travels through a porous material, the grain acceleration generates a divergence-free streaming current only in the SH article motion plane. That induces an electric field with the same polarization as the particle displacement. The induced streaming current acts as a current source in the transient electromagnetic diffusive equation. The electroseismic (EOS) equations have the form of Biot’s equations coupled to Maxwell’s equations. The SH wave couples to the electromagnetic wave field components of the TE mode. This paper is concerned with an improved finite-element method (FEM) of solving of Biot’s SH-wave equations. It is well known that conventional finite-element algorithms usually solve super large bandwidth multidimensional finiteelement matrix equations iteratively so that they require much computational time and memory storage. They are limited to simulate large models or multi-variable dynamic wave equations. The accuracy is usually reduced by complex methods of solving linear equations. We derived a tensor product finite-element equation based on a variational form of Biot’s SH-wave equations. The new finite-element equation is expressed as single-dimensional mass and stiffness matrixes instead of the two-dimensional mass and stiffness matrixes. Considering the new form of the finiteelement matrix equation, we developed a conditionally stable algorithm that only deals with tri-diagonal matrixes on the condition of piecewise linear interpolation function. Hence, the memory space the new algorithm required is of the order of magnitude of the space the variable vector used. Methods of solving the tri-diagonal finite-element matrix equation are usually independent of the accumulated rounding-off errors so that this algorithm is improved in accuracy. Numerical tests showed that the new finite-element algorithm is very efficient.