http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
여러수준의 산성비가 고추씨의 발아율 및 모 생육에 미치는 영향
차병진,이재춘 충북대학교 농업과학기술연구소 1994 農業科學硏究 Vol.11 No.2
In the experiment to determine the effect of simulated acid rain(SAR) of various pH on the germination rate and the growth of Capsicum annum cv. Komyung(red pepper), the low pH of SAR accerlated the grrmination of the seeds even though the effect of pH was not statistically significant. After 10 days of SAR treatment, soil pH dropped to a great extent. There was, however, little change in tap water treatment(control) . In SAR of low pH(2.5, 3.0), soil pH was lower than that of control after 10 days of treatment, but, it became lower after 20 days of treatment in high pH(3.5, 4.0, 4.5) SAR. Visible symptoms caused by SAR were white spot and marginal necrosis of the leaves. The lower the pH of SAR, the more the number of spots per leaf and the number of spotted leaves. Decrease in pH of SAR increased the severity of damage and reduced the period that the first visible symptom appeared. Effect of SAR on the DW/FW ratio of red pepper seedlings was not significant. Either in dry weight or fresh weight, root/shoot ratio of the seedlings, however, varied significantly by the pH of SAR. That is to say, root growth of SAR-treated seedlings was inhibited compared to that of tap water-treated seedlings.
Copper billet열간압출의 정상상태 유한요소해석에 관한 연구
이춘만,전병우 國立 昌原大學校 産業技術硏究所 1999 産技硏論文集 Vol.13 No.-
This study is concerned with a study on steady-state finite element analysis of hot extrusion for copper billet. The design of extrusion dies is still an art rather than science. Die design for a new extrusion is developed from through in-plant trials. In the present paper, axisymmetric steady-state finite element simulation program is developed. Steady-state assumption is used for both the analyses of deformation and temperature. The developed program is effectively used to simulate two cases of extrusion processes. Distributions of temperature, effective strain rate, mean strain rate and mean stress are studied for an effective design of an extrusion die.
多數의 不偏推定量을 合成하기 위한 알고리듬에 關한 硏究
林炳春 春川敎育大學 1986 論文集 Vol.26 No.-
This thesis concerns the linear combination of several or many unbiased estimates of success probability in Bernoulli trials under various sampling plans. Binomial, negative binomial, and their curtailed sampling plans are considered. The criteria combining them is to minimize the variance of resulting estimate which is also to be unbiased. Thus a mathematical model can be constructed, the objective function of which implies the minimization of the variance of combined unbiased estimate and the constraint of which implies the sum of weights equals to one. An algorithm finding approximated optimal values of weights is constructed and some examples are presented.
강병모,박계춘 木浦大學校 工業技術硏究所 1997 工業技術硏究誌 Vol.7 No.-
ZnO and Al2O3 powders were mixed in 1:1 mole ratio and ball-milled with ethanol for 3h. After the pressing process, the mixtures were sintered at 700°C~1300°C for 5 h in air to form ZnAl2O4. Structural properties were analyzed by X-ray diffraction patterns : optical properties by sbsorption spectra with UV-VIS-NIR Spectrophotometer : microstructural properties by SEM : photoluminescent properties by using PL Measuring System. In result, ZnAl2O4 phosphor is crystallized at 1100°C and optical bandgap is calculated at 4.65 eV. PL spectra were shifted to longer wavelengths with increasing temperature and was appeared around 780mm at 1300°C. Additionally, the peak intensity was very strong at 800°C and was declined with increasing temperature.