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F. Brossa A. Cigada R. Chiesa L. Paracchini C. Consonni 《Journal of materials science. Materials in medicine》1994,5(12):855-857
The purpose of this work is to evaluate the effects of post-deposition heat treatments on high and low crystallinity hydroxyapatite coatings on Ti6Al4V alloy. HA layers were produced by the vacuum plasma spray (VPS) technique, and the desired degrees of crystallinity were obtained by changing the deposition parameters. An analysis of the mechanical properties of the coatings and their adhesion to the substrate has been done by shear strength test. X-ray diffraction analysis was used to detect the structure and the chemical components in which HA dissociates during the deposition process and heat treatments. The data obtained indicates that heat treatments can increase the crystallinity of HA, but they also introduce a mechanical degradation of the coatings. After heat treatments, it was also observed that a large amount of tetracalcium phosphate was formed. 相似文献
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Branching and pruning: An optimal temporal POCL planner based on constraint programming 总被引:2,自引:0,他引:2
A key feature of modern optimal planners such as graphplan and blackbox is their ability to prune large parts of the search space. Previous Partial Order Causal Link (POCL) planners provide an alternative branching scheme but lacking comparable pruning mechanisms do not perform as well. In this paper, a domain-independent formulation of temporal planning based on Constraint Programming is introduced that successfully combines a POCL branching scheme with powerful and sound pruning rules. The key novelty in the formulation is the ability to reason about supports, precedences, and causal links involving actions that are not in the plan. Experiments over a wide range of benchmarks show that the resulting optimal temporal planner is much faster than current ones and is competitive with the best parallel planners in the special case in which actions have all the same duration.1 相似文献
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This study, which deals with the distribution of hydrocarbons in seven types of rabbit tissues, was done for the purpose of
providing information that might help shed light on the biological relevance of the hydrocarbons in mammalian metabolism.
Liver, kidneys, brain, spleen, skeletal muscle, perinephric adipose, and a sample of blood serum were collected from a single
animal for analysis of their hydrocarbon composition. The analytical methodology consisted of solvent extraction, saponification
(adipose), elution chromatography on hydrated alumina, and combined gas chromatography-mass spectrometry. Hydrocarbons were
detected in all of the tissues examined at concentrations estimated to range from 0.1 to 0.01% of the total lipid extracted.
Three quite distinct distribution modes were recognized. The bulk of the identified components consisted of normal, saturated,
nonterpenoid hydrocarbons in the C16 to C33 range. Squalene, phytene, phytadiene, and pristane were the only terpenoids detected. Nonterepenoid branched (iso andanteiso) hydrocarbons were identified unequivocally and in significant amounts in the muscle only. The adipose was the only tissue
which was relatively rich in monoalkenes, and its overall hydrocarbon composition closely resembled that of the feed. The
results of the study are not consistent with metabolic inertness. The observed qualitative and quantitative differences might
reflect function and metabolic activities of the individual organs in a way yet to be elucidated.
Presented in part at the AOCS Spring Meeting, New Orleans, April, 1976. 相似文献
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Blends of unsaturated polyester resin and polyvinylacetate (PVAc) were cured between two glass slides. In this case, the low-profile
effect arises by fissuring with a fractal geometry. This paper shows how the fractal dimension of the fissures depends on
the PVAc amount and on the cure temperature. These results are discussed with the present knowledge about the polyester network
morphology in two phases more or less co-continuous. 相似文献
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Vincent J. Senn 《Journal of the American Oil Chemists' Society》1969,46(9):476-478
Cold-pressed peanut oil was separated into chromatographically homogeneous fractions by column chromatography. The fatty acid
composition of the major fractions was determined by gas chromatography. The phosphatides, and especially the cephalins, had
a higher palmitate content than did the triglycerides. Palmitate was the dominant fatty acid in the phosphatidyl-serines. 相似文献
9.
Kaouthar?DeghdakEmail authorView authors OrcID profile Vincent?T’kindt Jean-Louis?Bouquard 《Journal of Scheduling》2016,19(4):467-478
In this paper, we consider a large-scale evacuation problem after a major disaster. The evacuation is assumed to occur by means of a fleet of buses, thus leading to scheduling the evacuation operations by buses [(bus evacuation problem (BEP)]. We propose time-indexed formulations as well as heuristic algorithms such as greedy algorithms and a matheuristic. This matheuristic uses the former formulation to improve the best solution obtained by the greedy heuristics. In computational experiments, we analyze and evaluate the efficiency of the proposed solution algorithms. 相似文献
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