To investigate the relation of NOx emission and consumption rate in a direct injection diesel engine with a multihole nozzle under same fuel consumption and rpm, a naphthyl ethylenediaming method on NO, emission and Tektronix oscilloscop on the indicator diagrams have been used. Comparisons of the NOx emission and fuel consumption rate made on various conditions have led to the fllowing results. 1. The higher the injection pressure in the later injection time the lower NOx emission and the fuel consumption rate have been attained. 2. By the change of nozzle hole diameter under the same injection pressure, the NOx emission was much more lowered in the small diameter than large one, but fuel consumption rate was in inverse proption to the NOx emission. 3. The effect of injection spray angle, 1ndn on NOx emission, fuel consumption rate under same injection time and injection pressure was neglectable.
The optical properties of the sea water were studied by use of underwater photometers in the coastal waters of Busan, from December 1975 to May 1976. The absorption coefficient of the sea water in the area ranged from 0.223 to 0.901 and the mean was 0.355. Maximum valae of monthly mean was 0.454 in December, while the minium was 0.301 in January. The transparency in winter was higher than that in spring and the mean was 4. 7 meters. The relation between absorption coefficient (m) and transparency (D) was m= 1. 67/ D. The rate of light penetration at 5 m-layer in the area ranged from 1. 73 to 24.09 percent and the mean was 13.63 percent, while the rate at 10 m-layer ranged from 0.067 to 8.05 percent and the mean was 2.95 percent.
1. Around the Jeju Island, 214 fish species are described by some authors, of which 53 species are regarded as major fishes for the object of commercial fishing. 2. Major fishing method around the Jeju Island are scoop net for anchovy, gill net for mackerels, long line for sea breams. For large pelagic fishes such as yellow tail, tolling method are expected.
A series of physical oceanographic investigations of the circulation in the Kwang Bay' were carried out seven times from May 1974 to May 1975 every other month. The average water transports through the southern entrance of the' Kwang Yang Bay were approximately 1,014×I06m3/half-tide in ebb current and 278×106m3</TEX/half-tide in flood current, while at the Noryang Sudo there were approximately 405.6×I06m34/half-tide in ebb current, and 282×106m3 /half-tide in flood current, at the maximum current intensity. The water from Seomjin River flows into the bay at an annual average rate of 84×I06m3/half-tide, the rate being fluctuated from month to month from 6.0×106m3 to 11. 5×I06m3 per half-tide.
겨울철 북서태평양인 캄차카 부근 해역에 영향을 주는 저기압의 특성을 종합,분석하고 그 발달기구를 규명하기 위하여 기상월보(1966~1974년) 9닌분과 일본 기상철 발행의 인쇄기일도(1970~1974년)5년분을 사용 분석한 결과를 요약하면 다음과 같다. 1) 겨울철 우리나라 부근에서 발현하는 저기압의 총수는 157개 였다. 이것을 월별로 보면 12월 1월에 각각 48개였고,2월에는 61개 발생했으며 경로별로는 BD경로, 즉 중국에서 발생하여 한국을 통과한 뒤 일본의 북해도로 진입하는 저기압은 총 53개로 전체의 36%로 가장 많았으며, CD경로 즉 대만 부근에서 발생하여 동해를 통과하는 저기압은 총 15개로 전체의 13%로 가장 적었다. 2)저기압 강하도는 A경로 일때가 제일 적었고, CD경로 일때가 가장 컸다. 또한 풍속변화량은 C,CD경로일 대가 최대였고, A경로 일때가 최소였다. 3)저기압이 통과하는 상층에 Jet류가 전일에 비해서 하강, 남하할 경우에는 한기중의 막대한 양이 저기압 후면으로 강하하면, 이에 따르는 위치 에너지의 감량이 저기압을 발달시킨다. 반면에 Jet류가 본래의 상태로 정체하고 있는 경우에는 위치에너지의 변화가 거의 없으므로 저기압은 별로 발달하지 않으며,만일 발달한다고 해도 해면 증발등과 같은 지상조건에 따를 뿐이다. 4)700mb면 등온선의 상층골과 기온극대축(혹은 극소축)의 상관위치 관걔는 저기압 발달에 많은 영향을 준다.