The carcass traits, the muscle fiber characteristics and the meat quality traits were evaluated using 200 crossbred pigs. The muscle mass was divided into heavy or light groups according to the carcass weight and the loin‐eye area measurements. In addition, the proportion of the fast‐twitch glycolytic muscle fiber was divided into high or normal groups according to the area percentage of type IIb fiber. Heavier pigs contained larger loin‐eye area and muscle fibers, and also had more total muscle fibers than the lighter ones. The high group showed lower muscle pH, protein solubility, and also showed higher R‐value, drip loss and lightness than the normal group. These results suggest that an increase in total fiber number combined with a higher percentage of oxidative muscle fibers has a beneficial effect on increasing the muscle mass without deteriorating the meat quality.
This study evaluated the performance of a hybrid panel that can overcome the current problem of corrosion of the steel panels of improved movable weirs when they are exposed to a sulfate and calcium chloride environment such as sea water. A hybrid panel with glass fiber-reinforced polymer (GFRP) layers on both sides of a steel panel means that the central panel is not exposed to the external elements, which can avoid corrosion problems. In this study, to maximize the hybrid panel’s strength and durability, the moisture absorption characteristics and the durability in an accelerated environment were evaluated. The test results were considered to indicate no durability issues as the final absorption ratio was approximately 2.0% or less in all environments. Also, from the accelerated deterioration test results when the steel panel processed by sand blasting was applied in all accelerated deterioration environments, it satisfied the residual strength level of 65% or more. However, in the case without surface processing, upon exposure to MgSO4 solution, it did not satisfy the standard residual strength level of 65%. These results show that sand blasting on the surface of a steel panel is adequate for hybrid panels for improved movable weirs.
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