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李原鎭,成德鏞,全永基,申再鉉 대구산업정보대학 1998 논문집 Vol.12 No.2
It was investigated the variation of polarization by the double refraction of light for a calcite crystal. In a calcite there is a single direction called the optics axis, which is an axis of symmetry with respect to both the crystal form and the arrangement of atoms. For a point in calcite, there are three principal sections, one for each pair of opposite crystal faces. A principal section always cuts the surfaces of a calcite crystal in a parallelogram withe angles of 71˚ and 109˚. When a beam of plane-polrized light is directed along the optic axis of calcite crystal, the plane of polarization turns steadily about the direction of the beam and emerges vibrating in some other plane than that at which it entered. The law of Malus is ralationship how the intensity transmitted by the analyzer varies with the angle that its plane of transmission makes with that of the polarizer. The pane polarization, θ was obtained from the law of Malus was 20.2˚
Choi, Eun-Young,Jeon, Min Ku,Lee, Jeong,Kim, Sung-Wook,Lee, Sang Kwon,Lee, Sung-Jai,Heo, Dong Hyun,Kang, Hyun Woo,Jeon, Sang-Chae,Hur, Jin-Mok Elsevier 2017 JOURNAL OF NUCLEAR MATERIALS Vol.485 No.-
<P><B>Abstract</B></P> <P>We present our findings that uranium (U) metal prepared by using the electrolytic reduction process for U oxide (UO<SUB>2</SUB>) in a Li<SUB>2</SUB>O–LiCl salt can be reoxidized into UO<SUB>2</SUB> through the reaction between the U metal and Li<SUB>2</SUB>O in LiCl. Two salt types were used for immersion of the U metal: one was the salt used for electrolytic reduction, and the other was applied to the unused LiCl salts with various concentrations of Li<SUB>2</SUB>O and Li metal. Our results revealed that the degree of reoxidation increases with the increasing Li<SUB>2</SUB>O concentration in LiCl and that the presence of the Li metal in LiCl suppresses the reoxidation of the U metal.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Uranium (U) metal can be reoxidized into UO<SUB>2</SUB> through the reaction between the U metal and Li<SUB>2</SUB>O in LiCl. </LI> <LI> The degree of reoxidation increases with the Li<SUB>2</SUB>O concentration in LiCl. </LI> <LI> The presence of the Li metal in LiCl suppresses the reoxidation of the U metal. </LI> </UL> </P>
Stability of yttria-stabilized zirconia during pyroprocessing tests
Choi, Eun-Young,Lee, Jeong,Lee, Sung-Jai,Kim, Sung-Wook,Jeon, Sang-Chae,Cho, Soo Haeng,Oh, Seung Chul,Jeon, Min Ku,Lee, Sang Kwon,Kang, Hyun Woo,Hur, Jin-Mok Elsevier 2016 Journal of Nuclear Materials Vol.475 No.-
<P><B>Abstract</B></P> <P>In this study, the feasibility of yttria-stabilized zirconia (YSZ) was investigated for use as a ceramic material, which can be commonly used for both electrolytic reduction and electrorefining. First, the stability of YSZ in salts for electrolytic reduction and electrorefining was examined. Then, its stability was demonstrated by a series of pyroprocessing tests, such as electrolytic reduction, LiCl distillation, electrorefining, and LiClKCl distillation, using a single stainless steel wire mesh basket containing fuel and YSZ. A single basket was used by its transportation from one test to subsequent tests without the requirements for unloading.</P>
Factors to Assess for Re-breeding after Parturition in Milking Cows
Sung Jai Park,Kwang-Soo Baek,김현섭,Byeong-Soon Jeon,Tai-Young Her,Hyun-Joo Lim,Seok-Jin Kang,Hyun-June Lee,Woon-Mo Jo,김상범,Young-Hun Jung,Byeong-Seog Ahn 사단법인 한국동물생명공학회 2009 Reproductive & developmental biology Vol.33 No.3
The purpose of this study was to assess for re-breeding concentrate period in postpartum in milking cows. The 48 cows aged 3.5~5.5 years and of 400~600 kg body weight were examined every 3rd day from 15 to 36 day postpartum. Blood samples for progesterone and estradiol 17 β hormone analyses were withdrawn from the coccygeal vein every third day until the end of the experiment. The ovarian follicular numbers were verified and measured using a multi frequency probe. The least squares means are presented for each day by GLM of SAS. The results showed that ovary lengths (right ovary; 1.64±0.62 cm, left ovary; 1.44±0.46 cm) were similar in right and left ovary activity level during estrous cycle of postpartum cows. We were judged completed uterus on day at 2.31±0.17 cm level of cervix diameter. And we were monitoring started at 6.44±2.03 cm from day 15 after postpartum. The results showed that mean plasma concentration of progesterone (3.28 ng/ml) in large follicle gradually increased days 30 in postpartum. And, monitoring of estradiol 17β (22.18 pg/ml) hormone during postpartum period would be useful to predict the ovarian and uterus activity for re-breeding in postpartum milking cows. From these results, we conclude that cervix diameter (mean: 2.31 cm) was very important for reproductive organ recovery standard level of postpartum milking cows, hormone secretion level (P4: 3.28 ng/ml, E2: 22.18 pg/ml) and body condition score (2.5~2.75) level about 30 days in postpartum period.