The hydrodynamics of a gas-liquid-solid circulating fluidsized bed was investigated. A new regime, the three phase circulating fluidization regime, was discovered for the first time. The characteristics of this regime were compared with that of the conventional fluidization regime and the transport regime. The particle circulation rate and the gas and solids holdups in circulating fluidization regime were studied.On a ttudit I'hydrodynamique d'un lit fluidid circulant gaz-liquide-solide. Un nouveau r6gime, le d g h e de fluidisation circulant triphasique, a t t t dkouvert pour la premikre fois. Ses caractkristiques sont cornparks h celles du rtgime de fluidisation classique et du rtgime de transport. On a thidit la vitesse de circulation des particules et les retentions de gaz et de solides en rCgime de fluidisation circulant.
The texture of an extra low-carbon and high strength bake-hardening sheet steel (i.e. ELC-BH sheet) processed in our laboratory through a new invented technology has been investigated by means of ODF method, so that the cause of the very high ?--value
The PPP rail transit projects develop rapidly in China, due to its many participants, long construction period, large scale and other characteristics, causing lots of risks in the construction process. It need to evaluate its risk to identify key risks. Considering the features of PPP and rail transit projects, the three level index system of risk assessment in the whole life cycle of the PPP rail transit projects are established, which combines the characteristics of PPP project. The fuzzy semantic quantization operator and the normalized decision matrix are used in the CUOWGA operator to improve it. The improved CUOWGA operator and Shapley function are combined to evaluate the index system of risks. This model not only eliminates the subjective assumptions of decision data in the operation process, but also considers the correlation in different risks, and makes the evaluation result more accurate. Finally, the science and effectiveness of the combined model is verified by a case.
The process of releasing hydrogen from nickel foil permeated with hydrogen is investigated by XRD and a laboratory EXAFS equipment which is attached on a X-ray spectrometer. The results obtained by these two methods show that the phase content of NiH decrease exponentially in this process We also determine a definite atomic ratio of Ni and H in NiH phase and point out the location of hydrogen in the lattice. This laboratory. EXAFS equipment is proved to be suitable for the study of this kind of problem.
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