Notice of RetractionAnalysis of Shear Behavior for Medium and Heavy Plate
With the continuous development of large-scale software, the theory of finite element, and computer speed, so the accuracy has been continuously improved for numerical analysis of finite element. The numerical analysis method of finite element has become increasingly widely used in dealing with practical engineering problems, the calculated model was established by elastic-plastic theory under taking into account the factors including materials work-hardening, the velocity of cutting edge and so on. The law of stress and deformation has done a detailed analysis of deformation zone during shearing continuous casting slab based on the model. It can gain the largest shear force by the travel curve of shear stress, and seek the numerical simulation method for tilting shear force and energy parameters of the shearing machine, reach the purpose of less experiment and reducing the cost analysis. The results provide an effective way to determine the maximum shear stress and enhancement the useful rate of the cutting edge.
RESEARCH OF THREE-DIMENSIONAL DISTRIBUTION OF INTERNAL STRESS IN STRIP COILING PROCESS
In cold strip coiling process, the stress distribution in coil is determined by shape, crown and the transverse distribution of coiling tension At the same time, the influence on stress distribution of friction between strip and drum, between strip and strip can't be ignored In addition, due to the gap between layers, the coil must be treated as anisotropic body Based on above factors, a new three dimensional mathematic model has been developed to calculate the internal stress distribution in coil, and study the coiling tension control to reduce coil sticking rate in the bell type annealing furnace
Ozonation of polycyclic aromatic hydrocarbons in oil/water-emulsions: mass transfer and reaction kinetics.
The ozonation of highly condensed polycyclic aromatic hydrocarbons (PAH) was studied in oil/water-emulsions, which are comparable to poorly water-soluble PAH in industrial wastewaters and at contaminated sites. As there was a lack of knowledge about the ozonation in oil/water-emulsions, first the ozone mass transfer was studied and optimized from the gas to the water phase and from the water to the oil phase. The ratio of mass transfer and oxidation reaction was determined by the Hatta-number and revealed a slow, quasi homogeneous reaction of ozone with PAH inside the oil droplets. Because the ozone gas concentration had no influence under the optimized conditions, the selective PAH-ozonation could be described microkinetically by a direct ozone reaction of pseudo-first order regarding PAH-concentrations. The determined PAH mean reaction rate constants of 1.02 min(-1) in oil/water-emulsions are in the upper range as found for PAH dissolved in water. These results give a new insight into the ozonation in the three-phase systems and into the treatment of highly condensed, hardly biodegradable PAH.