This study made it possible to determine by the application of thermodynamics in finished time, the points of instruction necessary to the development of a regulation system for the rationalization of the power consum...This study made it possible to determine by the application of thermodynamics in finished time, the points of instruction necessary to the development of a regulation system for the rationalization of the power consumption in a cold store. These points were obtained by determining the optimal variations of temperature as well to the condenser and the evaporator corresponding to the minimum capacity absorptive by the compressor for a maximum COP.展开更多
Surface texture of the mouthguard affects the sense of adaptation in the athlete and further affects hygiene. The aim of this study was to investigate the changes over time in surface roughness after finish polishing ...Surface texture of the mouthguard affects the sense of adaptation in the athlete and further affects hygiene. The aim of this study was to investigate the changes over time in surface roughness after finish polishing of ethylene vinyl acetate (EVA) sheets and before and after finishing liquid application, and to evaluate its effectiveness. Total of 160 specimens of EVA (3 × 3 mm) were divided into 4 groups according to polishing condition (control = unpolished;RB = Robinson-brush;LF = Lisko-Fine, and MW = Mouthguard-wheel). Polishing was performed at low speed by using a straight headpiece. The rotation speed was 5000, 4000 and 6000 rpm for RB, LF, and MW, respectively. Next, a finishing liquid was applied to each specimen. Changes over time in surface roughness before and after application of the finishing liquid were compared by a non-contact surface shape measuring machine. The arithmetic average height (Sa) was measured. The measurement time points were before application, immediately after application, and at 5, 10, and 15 min after application. The changes over time of the surface roughness of the sheet before and after application of the finishing liquid were analyzed by two-way analysis of variance and Bonferroni’s multiple comparison tests. Surface roughness of the specimen before application became coarse in the order of control;MW, LF and RB, and Sa were about 0.21 μm, 2.03 μm, 2.94 μm, and 4.72 μm, respectively. That showed the same order after finishing liquid application. Significant decrease in Sa for RB and LF were seen at 10 min after application and at 5 min after application, respectively. Sa of MW was not significantly different before and after application. The results of this study showed that a lubricity of about 1.0 μm increases within 5 - 10 min of application of finishing liquid, but in cases where polishing was performed to about 2.0 μm;the application of finishing liquid has no ef-fect.展开更多
To determine mirror surface finishing conditions and efficient and economical superfinishing conditions for pure titanium and titanium alloys,an abrasive film is used when superfinishing is performed under varying con...To determine mirror surface finishing conditions and efficient and economical superfinishing conditions for pure titanium and titanium alloys,an abrasive film is used when superfinishing is performed under varying conditions.These conditions include the workpiece rotation speed,the oscillation speed,the contact pressure of the roller,the hardness of the roller,and the type of abrasive film.The superfinishing device is applied to polishing a thin and long cylindrical bar.A micro-finishing film and a lapping film were used as abrasive films.Al2O3 grains or SiC grains were used as abrasives.The surface roughness of a polished workpiece was measured using a stylus-type surface-roughness measuring instrument.As a result,the conditions to improve the polishing surface efficiently include high values for the workpiece rotation speed,oscillation speed and contact pressure.The roller hardness has no effect on the efficient polishing conditions.The mirror finish of a surface can be created using lapping film of 3 μm with Al2O3 grains after polishing to a steady surface roughness under the efficient polishing conditions.展开更多
The combustion mechanisms of PP / Viscose blend fabrics are briefly discussed, and the factors affecting flame retarding(FR) effect are analyzed. Apart from this, the choice of processes of FR finish is also discussed...The combustion mechanisms of PP / Viscose blend fabrics are briefly discussed, and the factors affecting flame retarding(FR) effect are analyzed. Apart from this, the choice of processes of FR finish is also discussed in this paper. Other factors such as coating add-on, curing temperature and time are studied too. The results show that the factors above all have different extent of influence upon FR effect.展开更多
文摘This study made it possible to determine by the application of thermodynamics in finished time, the points of instruction necessary to the development of a regulation system for the rationalization of the power consumption in a cold store. These points were obtained by determining the optimal variations of temperature as well to the condenser and the evaporator corresponding to the minimum capacity absorptive by the compressor for a maximum COP.
文摘Surface texture of the mouthguard affects the sense of adaptation in the athlete and further affects hygiene. The aim of this study was to investigate the changes over time in surface roughness after finish polishing of ethylene vinyl acetate (EVA) sheets and before and after finishing liquid application, and to evaluate its effectiveness. Total of 160 specimens of EVA (3 × 3 mm) were divided into 4 groups according to polishing condition (control = unpolished;RB = Robinson-brush;LF = Lisko-Fine, and MW = Mouthguard-wheel). Polishing was performed at low speed by using a straight headpiece. The rotation speed was 5000, 4000 and 6000 rpm for RB, LF, and MW, respectively. Next, a finishing liquid was applied to each specimen. Changes over time in surface roughness before and after application of the finishing liquid were compared by a non-contact surface shape measuring machine. The arithmetic average height (Sa) was measured. The measurement time points were before application, immediately after application, and at 5, 10, and 15 min after application. The changes over time of the surface roughness of the sheet before and after application of the finishing liquid were analyzed by two-way analysis of variance and Bonferroni’s multiple comparison tests. Surface roughness of the specimen before application became coarse in the order of control;MW, LF and RB, and Sa were about 0.21 μm, 2.03 μm, 2.94 μm, and 4.72 μm, respectively. That showed the same order after finishing liquid application. Significant decrease in Sa for RB and LF were seen at 10 min after application and at 5 min after application, respectively. Sa of MW was not significantly different before and after application. The results of this study showed that a lubricity of about 1.0 μm increases within 5 - 10 min of application of finishing liquid, but in cases where polishing was performed to about 2.0 μm;the application of finishing liquid has no ef-fect.
基金work supported by the Second Stage of Brain Korea 21 Projects of Korea
文摘To determine mirror surface finishing conditions and efficient and economical superfinishing conditions for pure titanium and titanium alloys,an abrasive film is used when superfinishing is performed under varying conditions.These conditions include the workpiece rotation speed,the oscillation speed,the contact pressure of the roller,the hardness of the roller,and the type of abrasive film.The superfinishing device is applied to polishing a thin and long cylindrical bar.A micro-finishing film and a lapping film were used as abrasive films.Al2O3 grains or SiC grains were used as abrasives.The surface roughness of a polished workpiece was measured using a stylus-type surface-roughness measuring instrument.As a result,the conditions to improve the polishing surface efficiently include high values for the workpiece rotation speed,oscillation speed and contact pressure.The roller hardness has no effect on the efficient polishing conditions.The mirror finish of a surface can be created using lapping film of 3 μm with Al2O3 grains after polishing to a steady surface roughness under the efficient polishing conditions.
文摘The combustion mechanisms of PP / Viscose blend fabrics are briefly discussed, and the factors affecting flame retarding(FR) effect are analyzed. Apart from this, the choice of processes of FR finish is also discussed in this paper. Other factors such as coating add-on, curing temperature and time are studied too. The results show that the factors above all have different extent of influence upon FR effect.
