Abstract: Disclosed are a colored expandable polystyrene resin having high strength, a method for producing thereof, and an expandable molded product using the same. More specifically, the colored expandable polystyrene resin having high strength of the present invention is characterized in that it is produced by adding nanocalcium carbonate and a colored dye into styrene monomer.

Abstract: The present invention relates to a system and method for detecting the remaining amount of a precursor in a vessel during a chemical vapor deposition (CVD) process. More particularly, the inventive system and method allow accurate measurement of the liquid level of the precursor remaining in the vessel during the CVD process by analyzing signals obtained by transmitting/receiving an ultrasonic wave. Thus, according to the present invention, the liquid level of the precursor can be measured in real time by means of an ultrasonic level sensor, thus preventing damages caused by the exhaustion of the precursor, resulting in a remarkable reduction in inferior products. Also, based on the above measurement results, the optimal replacement time of the precursor can be determined, thus extending the use period of the precursor to the maximum.

Abstract: Provided are methods for manufacturing improved cerium oxide abrasives suitable for forming slurry compositions suitable for CMP processes. The cerium oxide abrasives are produced by the heat treatment of a mixture of a cerium precursor compound and an impurity metal compound under conditions that produce primary cerium oxide particles that are incorporated in larger secondary abrasive particles. The presence of the impurity metal and/or the incompletely oxidized cerium within the secondary abrasive particle tend to reduce its mechanical strength, thereby reducing the likelihood of damaging a substrate surface during a CMP process utilizing such abrasives.