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Two dimensional and three dimensional model for an inclined blade was evaluated to decide the soil physical properties which is necessary for draft prediction of moldboard plow. From the above model, soil cohesion, soil internal friction, soil-metal friction, soil-metal adhesion and bulk density were decided as soil parameters which are needed for computer simulation. Besides above soil parameters, soil moisture content and soil texture were measured for more information at the Iri, Namyang, Yeoju, Pyeongtaek, Asan, Suwon, Chungju, Milyang, Kimhae, Sangju, Kimpo and Kanghwa area from October to November and from March to May, from 1995 to 1996. The most popular soil texture was silty loam and loam The range of soil bulk density was 1500∼1700 kg/㎥. The range of soil cohesion was 10∼15 kPa and that of internal friction angle was 40∼60 degree. The range of soil-metal friction coefficient and adhesion was 0.3∼0.8 and 1.0∼3.0 kPa.
This study was carried out in order to find out the effects of hypophysectomy on ossa coxae in wister rats. After hypophysectomy, length of os ischii, os ilium, ramus clanialis ossis pubis and index of foramen obturatum were determined individually, and the results were obtained ranging from 1 day to 56 days. The hypophysectomy was capable of controlling the growth of ossa coxae but not capable of controlling the atrophy, degeneration and change of form.
This experiment was made to investigate the change of serum components in albino rats upon gestation period, and the results obtained are summarized as follows. 1. Total lipid in serm was increased as gestation period passed, and high significance with p 0.01 at 18 days was recognized as compared with control group. 2. Cholesterol in serum showed increasing significance with p<0.05 at 12th day and with p<0.01 at 18th day but before 12th day marked tendency was not showed. 3. Total protein in serum was decreased gradually as the process of time and at 18th day the significance (p<0.01) was decreased recognizably. 4. Sodium and Potassium in serum did not change markedly during gestation period. 5. The tendency of gradual decrease in calcium stowed as gestation period passed, and both significance at 12th day and at 18th day were recognized. Phosphorus content was decreasd at 18th days and significance (p<0.05) was recognized.