한국산 빗살방아벌레아과(Melanotinae)의 표본을 동정하고 기록 문헌을 정리한 결과 총 18종이 확인되었다. 그 중 Melanotus속으로는 M.chejuensis sp. nov.와 M. coreanus sp. nov.을 포함하여 11종이 확인되었다. 신종에 대하여 기재하고 각 종들의 성충 및 수컷생식기 사진과 함께 각 속, 종들에 대한 검안표를 작성하여 보고한다.

The superconducting electromagnetic propulsion system has been proposed as one of new alternative propulsion systems. Especially, the helical-type propulsion system has the greatest merit that is able to use the solenoid-type superconducting magnets with high magnetic fields. In this study, calculations of characteristics of the large scale helical-type thruster are carried out on the basis of our experimental results. As a couple of results of calculations, it is found that the thruster efficiency quickly increases with the length of electrode up to about 5 m and then goes up to about 0.9. The thruster efficiency peaks at a certain point (~0.6 m) and then falls as length of pitch increases.

Using a SQUID magnetometer, the diamagnetic susceptibility of NaCl aqueous solution was measured with high accuracy in a magnetic field of up to 6 Tat 25±0.05℃. The NaCl concentrations adopted in this experiment were 0 (water), 7.5, 15, 23, 26.2, 26.6 and 100% (crystal) with the concentration error of ±0.04%. Experimental data was compared with the calculated value of susceptibility derived from dependence of the vapor pressure on NaCl concentration As a result, our measured value was almost in accordance with the calculated value. It was found that the diamagnetic susceptibility shows a decrease of approximately 10% within the saturated concentration (26.2%) and that the susceptibility is one of the effective cause for the concentration dependence in the gas-liquid interface deformation of the NaCl solution.