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31.
Oil shales are rocks that contain organic matter and are used as a low-grade fuel for energy production. The oil shale combustion process produces large quantities of ash as combustion wastes. These residues contain a high concentration of calcium anhydrite (CaSO4) and calcium carbonate (CaCO3), which can be utilized to neutralize acidic wastes (e. g., wastes from the phosphate industry) .Using untreated oil shale bottom ash as partial substitutes for aggregates, natural sand, and cement in concrete mixtures has resulted in a significantly decreased performance of the concrete mixtures. However, by blending the oil shale with acidic materials, the concrete properties improved, as manifested by the development of compressive strength and the workability of the concrete mixtures. In the current study, it was shown that treatment of the oil shale ash with the acidic waste of the Israeli phosphate industry or with phosphoric acid significantly improves the properties of the concrete mixtures, by partial replacement of the natural aggregates and sand by the treated oil shale ash. 相似文献
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Given a feedback system with uncertain nonlinear plant, it is required that the plant's output, to a set of command inputs, will satisfy certain specifications, i.e., will be bounded between a maximum response β(t) and a minimum response α(t). A rigorous synthesis technique to solve this problem using an LTV controller is developed. A design example is included, and it is shown that the LTV design has much lower bandwidth as compared to LTI designs. All design steps utilize the well-established QFT technique for LTI SISO uncertain systems. The methodology also suits rejection of disturbances at the plant's input or output, and for output specifications for nonzero initial conditions. © 1997 by John Wiley & Sons, Ltd. 相似文献
34.
A. Yaniv 《Propellants, Explosives, Pyrotechnics》1988,13(4):106-110
The performance of redundant pyrotechnic delays is analyzed. It is found that the average delay time of a redundant cluster of delays is shorter than the corresponding average of the individual delays. Also, the standard deviation of the cluster delay time is smaller than the corresponding individual delay standard deviation. These two effects are found to be monotonic functions of the number of delays in the cluster. The effect of the delay reliability on the cluster statistics is shown to be qualitatively similar to a reduction in the effective cluster size. 相似文献
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36.
Ariel Felner Yaron Shoshani Yaniv Altshuler Alfred M. Bruckstein 《Autonomous Agents and Multi-Agent Systems》2006,12(1):3-34
Physical A* (PHA*) and its multi-agent version MAPHA* are algorithms that find the shortest path between two points in an
unknown real physical environment with one or many mobile agents [A. Felner et al. Journal of Artificial Intelligence Research, 21:631–679, 2004; A. Felner et al. Proceedings of the First International Joint Conference on Autonomous Agents and Multi-Agent Systems, Bologna, Italy, 2002:240–247]. Previous work assumed a complete sharing of knowledge between agents. Here we apply this
algorithm to a more restricted model of communication which we call large pheromones, where agents communicate by writing and reading data at nodes of the graph that constitutes their environment. Previous
works on pheromones usually assumed that only a limited amount of data can be written at each node. The large pheromones model assumes no limitation on the size of the pheromones and thus each agent can write its entire knowledge at a node. We
show that with this model of communication the behavior of a multi-agent system is almost as good as with complete knowledge
sharing. Under this model we also introduce a new type of agent, a communication agent, that is responsible for spreading the knowledge among other agents by moving around the graph and copying pheromones. Experimental
results show that the contribution of communication agents is rather limited as data is already spread to other agents very
well with large pheromones 相似文献
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38.
I.E. Klein J. Sharon A.E. Yaniv H. Dodiuk D. Katz 《International Journal of Adhesion and Adhesives》1983,3(3):159-162
Chemical interactions in the primed aluminium/adhesive interphase were examined using IR reflectance spectroscopy. For the case of epoxy primers and polyurethane adhesives, a new absorption was detected and was attributed to an isocyanate group, formed by reaction between the epoxide primer and the polyurethane adhesive. When polyurethane adhesive was applied on a polyurethane primer, such a primer-adhesive interaction was not noticed. 相似文献
39.
A new approach is suggested for calculating and measuring the two-dimensional magnetic field of an array of cylindrical ferromagnetic bars in a uniform magnetic field. The field is determined with allowance for mutual magnetization of the bars in a finite array. It is shown that the array can amplify the external uniform field and its gradient to different degrees, thereby increasing the magnetic forces. The method is reasonably accurate and convenient in use; theory and experimental results are in good agreement. 相似文献
40.
A new technique, whereby the so-called "iso-directional-force lines" may be illustrated directly, is proposed. The method is based on the levitation forces acting on a particle immersed in paramagnetic fluid in nonhomogeneous magnetic field. An ordered set of capillaries, each containing a small particle suspended in the fluid, may be used to depict the iso-directional-force lines by the equilibrium positions of the particles. Once the field is mapped (by a selected standard system), its characteristics are known, with respect to any other fluid particle combinations. The latter is of significance for research and technology. 相似文献