At shipyards, to enable design cooperation with engineering companies or to meet ship owner's requirements, there is a need to translate ship models from one ship CAD system to another ship CAD system. In this paper, a method for translating pipe models from Aveva Marine to SmartMarine3D is introduced. Related data and architecture of translation system are addressed and specific details to be considered during translation are explained. The introduced method has been implemented and tested in a shipyard.

When collecting dust samples from coal-fired power plant chimneys, a nozzle specially designed with an inlet shape of circle type is used for constant velocity suction. However, it is cumbersome to use nozzles with different areas depending on the flow rate. In this study, the effect of the nozzle inlet shape of the isokinetic sampler on the performance of constant velocity suction was evaluated through simulation. The simulations were conducted using the realizable k−ε model, which is known to be suitable for separation flow analysis for particles of 1–50 μm. The turbulent flow fully developed before reaching the inlet of the sampling probe, and the flow rate was set under the condition that the uniformity was secured at approximately 92% at least. The aspiration ratio was employed for evaluating the degree of constant velocity aspiration of the isokinetic sampling probe. It was found that the larger the particle diameter and the faster the flow rate, the larger the aspiration ratio for both the circular and ellipsoidal inlets. In particular, compared with the circular inlet, the aspiration ratio of the sampler with ellipsoidal inlet was closer to 1 in the free-flow velocity range, from 5 to 15 m/s. For this reason, if the ellipsoidal inlet nozzle is used by adjusting only the length parallel to the major axis, the maintenance cost is expected to be reduced compared to the circle-type nozzle.

This study was conducted to examine the genetic diversity and population structure of 17 Brassica juncea populations in Korea. The technique of random amplified polymorphic DNA (RAPD) produced 60 polymorphic loci and 18 monomorphic loci. In a simple measure of intraspecies variability by the percentage of polymorphic bands, the Jindo population of Cheonnam showed the highest (29.5%). The cultivar exhibited the lowest variation (12.8%). Mean number of alleles per locus (A) and the effective number of alleles per locus (AE) were 1.221 and 1.167, respectively. As the typical populations of this species were small, isolated, and patchily distributed in their natural populations, they maintained a low level of genetic diversity of fourteen primers. On a per locus basis, total genetic diversity values (HT) and interlocus variation in the within-population genetic diversity (HS) were 0.347 and 0.141, respectively. On a per-locus basis, the proportion of total genetic variation due to differences among populations (GST) was 0.589. This indicated that about 58.9% of the total variation was among populations.The estimate of gene flow, based on GST, was very low among Korean populations of B. juncea (Nm=0.617). These results suggest that the geological distance dispersal of wild B. juncea is the best event. RAPD markers are very effective in classifying natural population levels of B. juncea in Korea.

No abstract

In this study, the geometry of a popular wave plate type mist eliminator used in the wet flue gas desulfurization process was improved. Subsequently, the equipment was fabricated and experimentally evaluated. A mist eliminator is a type of inertial particle collector, whose collection efficiency is proportional to the velocity of the gas phase. However, as the amount of reentrainment is also proportional to the gas phase velocity, the gas phase flow rate is limited. Reentrainment is one of the most crucial issues in a mist eliminator and likely to occur as the input of the liquid phase and flow rate of the gas phase increase. To resolve this problem, the projection angle of the improved mist eliminator is modified by 30° compared to that of the conventional one while maintaining the cross-section. Under low flow rate conditions, the modified mist eliminator showed a similar pressure drop and overall collection efficiency compared to those of the conventional equipment. However, under conditions where re-entrainment was significant, the modified mist eliminator showed better performance in draining droplets than the conventional one.As a result, the modified mist eliminator attained higher overall collection efficiency.