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姜乂默,李世鎭,李達遠 충남대학교 농업과학연구소 1990 농업과학연구 Vol.17 No.2
In order to investigate the influence of unconfined compression strength on undisturbed cohesive soil, the unconfined compression test were carried out on the basis of various size of specimen and compression rate. The result of these experiments were summarized as follows. 1. As the section area of specimen increased. the unconfined compression strength was decreased. 2. As the ratio of height and diameter of specimen increased, the unconfined compression strength was decreased. 3. The unconfined compression strength was increased by 3%, but values over the 3% was decreased. 4. As the compression rate increased. the modulus of deformation was increased.
용질배제 특성곡선에 의한 한외여과 막의 세공크기 및 분포예측
김우식,김종국,염경호,이세진 한국화학공학회 1990 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.28 No.2
Polysulfone 막(분획분자량 ; 3,000)을 이용, 분자량이 다른 4종류 dextran 용액의 한외여과 실험을 행하여 구한 음질배제 특성곡선으로부터 확률분포의 개념으로 막 세공크기 및 분포를 예측하였다. 이 결과 용질배제 특성곡선은 대수 정규확률지상에서 직선관계를 나타내었으며, 세공크기 분포변수인 평균값(μ)과 표준편차(θ)는 조작조건 변화에 따른 농도분극 및 용질형태 변형의 영향을 받았다. 용질배제 특성곡선으로부터 구한 polysulfone막의 평균 유효 세공반경은 14Å이었으며, 세공반경 분포는 5-40Å범위이었다. In this study polysulfone membrane (MWCO: 3,000) was used and ultrafiltration experiment was carried out for 4 types of dextran solutions having different molecular weight to obtain the solute rejection characteristic curve, from which the membrane pore size and the distribution could be predicted with the aid of the concept of probability distribution. The result showed that the solute rejection characteristic curve had a linear relation on log-normal probability paper and the mean (μ) and the standard deviation (θ), which are the pore size distribution parameters, were influenced by the concentration polarization and solute conformation according to the operating conditions. The apparent mean pore radius and the pore radius destribution obtained from the solute rejection characteristic curve were 14 Å and in the range of 5-40Å respectively.