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Aluminum-free low-modulus Ti–C composites that exhibit reduced image artifacts during MRI
Kim, Sung-Chul,Lee, Hong-Jun,Son, Seong-Guk,Seok, Hyun-Kwang,Lee, Kang-Sik,Shin, Seung-Young,Lee, Jae-Chul Elsevier 2015 ACTA BIOMATERIALIA Vol.12 No.-
<P><B>Abstract</B></P> <P>Feasibility studies were performed to determine the suitability of a novel synthesis technique for fabricating multifunctional composite materials for orthopedic implants. By blending paramagnetic Ti powder with diamagnetic graphite and consolidating the resulting mixtures, Ti–C composites that cannot be feasibly obtained via conventional alloying techniques or ingot metallurgy were synthesized. The synthesized composite material exhibited extremely low magnetic susceptibility (χ=67.6×10<SUP>−6</SUP>), and, as a result, exhibited fewer artifacts during magnetic resonance imaging. The strength of the composite material (σ=770MPa) was such that it could support external loads to which the human body is subjected, but its Young’s modulus was low (<I>E</I> =81.9 GPa) such that it could mitigate the stress-shielding effect. The material was also free from toxic elements such as Al and V and, thus, can be considered less harmful.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
리튬 이온 이차전지를 위한 부극용 Si 특성에 관한 연구
김성호,이상헌,박일현,김민철,우태욱,손영국 부산대학교 생산기술연구소 2000 生産技術硏究所論文集 Vol.59 No.-
리튬이온이차전지의 부극으로 Si를 사용하였다. 부극용 Si전극을 1회 충방전 시 Li이온이 탈 삽입될 때 각각의 전압에서 XRD 회절분석을 통하여 Li이온이 이동하여 Si와 반응하는 것을 조사하였다. 순환전압전류 및 충방전 시험을 통하여 전기 화학적 특성을 측정해본 결과 부극으로써 Si의 산화환원 반응이 양호하게 이루어졌으며 충방전에 대한 cycle number가 증가할수록 비가역적인 산화환원반응 및 부피변화로 인해 싸이클 특성 감소함을 나타내었다. Si with anode is used Li ion secondary batteries During Li ion intercalating at first cycle, XRD analysis studies at others voltages showed that Li ions are moved and reacted to Si The electrochemical properties of Si anode materials were evaluated by cyclic voltammetry and charge/discharge test. With cycle number increasing, cyclic characteristics are decreased for irreversible reduction/oxidation and volume change.
Effects of Elevated CO₂ on Maize Growth
Young-Guk Kim,Young-Son Cho,Jong-Ho Seo,Sok-Dong Kim,Jin-Chul Shin,Ho-Ki Park 韓國作物學會 2008 Korean journal of crop science Vol.53 No.1
The effects of CO2 enrichment on growth of maize (Zea mays L.) were examined. Parameters analyzed include growth characteristics, yields, photosynthetic rates, evaporation rates and photosynthesis-related characteristics under elevated CO2 . The plants were grown in growth chambers with a 12-h photoperiod and a day/night temperature of 28/21~circC at the seedling stage and 30/23~circC from the silking stage. The plants were exposed to two elevated CO2 of 500, 700ppm and ambient levels (350 ppm). Chalok 1 and GCB 70 germinated three days after seeding, and germination rates were faster in the elevated CO2 than the control. Germination rates displayed significant differences among the CO2 treatments. At the seedling stage, leaf area, top dry weight, and photosynthetic rates, and plant height indicated positive relationship with elevated CO2 concentrations. At the 5~6 leaf stage, CO2 concentration also indicated positive relationship with plant height, leaf area, top dry weight, and photosynthetic rates. At the silking stage, increased plant height of Chalok 1 was noted in the CO2 treatments compared to the control. No significant differences were noted for GCB 70, in which leaf area decreased but photosynthetic rates increased progressively with CO2 concentration. Stomatal aperture was a little bigger in the elevated CO2 than the control. CO2 concentration was negatively related to stomatal conductance and transpiration rates, resulting in high water use efficiency.
Soybean photosynthetic parameters to soil water content and CO2 concentration
Young-Son Cho,Sok-Dong Kim,Young-Guk Kim,Bon-Chul Koo,Jong-Ho Seo,Won-Ha Yang,Young-Han Yun 한국작물학회 2008 한국작물학회 학술발표대회 논문집 Vol.2008 No.10
Changing climate, especially water content(WC) and CO2 (CD) concentration could be effect on the growth of soybean and seed yield. So we evaluated the effects of WC and CD on the physiological characteristics of newly developed soy cultivars in growth chamber. Ten soy cultivars evaluated in three [CO2] levels (CD1, 350; CD2, 500; CD3, 700ppm) and three water content (WC1: 30%, WC2: 40, WC3: 50%) in the pot in growth chamber. Increased [CO2] from 350 to 500 and 500 to 700ppm enhanced crop growth parameters greatly and grain yield, however, grown in CD3 enhanced plant height increasing speed, and shortened growing duration, however, they were grow very weakly and it resulted in lodging problem. High soil water content (WC3) hampered growth and yield of soybean in three CD treatments and the degree was lower in CD1 and CD2 than CD3. In this results we can conclude increasing [CO2] in Korean peninsular might be decrease lodging resistance, especially high moisture content, so, plant breeders and physiologists need to develop improved lodging resistance cultivars under high water content and high CO2 content.
The Dairy Calves Mortality : the Causes of Death during Ten Yearsin a Large Dairy Farm
Tai Young Hur,Young–,Hun Jung,Seog–,Jin Kang,Chang yong Choe,Ui Hyung Kim,Il Sun Ryu,Dong Soo Son,Kwang Soo Baek,Kwang Seok Ki,Hyun June Lee,Eung Gi Kwon,Guk Hyun Suh,Young Il Cho 대한수의학회 2012 대한수의학회 학술대회발표집 Vol.2012 No.-
Effects of Elevated $CO_2$ on Maize Growth
Kim, Young-Guk,Cho, Young-Son,Seo, Jong-Ho,Kim, Sok-Dong,Shin, Jin-Chul,Park, Ho-Ki The Korean Society of Crop Science 2008 Korean journal of crop science Vol.53 No.1
The effects of $CO_2$ enrichment on growth of maize (Zea mays L.) were examined. Parameters analyzed include growth characteristics, yields, photosynthetic rates, evaporation rates and photosynthesis-related characteristics under elevated $CO_2$. The plants were grown in growth chambers with a 12-h photoperiod and a day/night temperature of $28/21^{\circ}C$ at the seedling stage and $30/23^{\circ}C$ from the silking stage. The plants were exposed to two elevated $CO_2$ of 500, 700ppm and ambient levels (350 ppm). Chalok 1 and GCB 70 germinated three days after seeding, and germination rates were faster in the elevated $CO_2$ than the control. Germination rates displayed significant differences among the $CO_2$ treatments. At the seedling stage, leaf area, top dry weight, and photosynthetic rates, and plant height indicated positive relationship with elevated $CO_2$ concentrations. At the $5{\sim}6$ leaf stage, $CO_2$ concentration also indicated positive relationship with plant height, leaf area, top dry weight, and photosynthetic rates. At the silking stage, increased plant height of Chalok 1 was noted in the $CO_2$ treatments compared to the control. No significant differences were noted for GCB 70, in which leaf area decreased but photosynthetic rates increased progressively with $CO_2$ concentration. Stomatal aperture was a little bigger in the elevated $CO_2$ than the control. $CO_2$ concentration was negatively related to stomatal conductance and transpiration rates, resulting in high water use efficiency.
정지영 ( Ji Young Jung ),유도현 ( Do Hyeon Yu ),신성식 ( Sung Shik Shin ),손창호 ( Chang Ho Son ),오기석 ( Ki Seok Oh ),허태영 ( Tai Young Hur ),정영훈 ( Young Hun Jung ),최창용 ( Chang Yong Choi ),서국현 ( Guk Hyun Suh ) 한국동물위생학회 2015 韓國家畜衛生學會誌 Vol.38 No.3
The incidence of second-grade milk production in 9 dairy farms of South Korea was investigated from May 2011 to March 2012, and the serum composition of cows producing first- and second-grade milk in 14 farms including the 9 farms was analyzed. The incidence rate of second-grade milk production of 402 cows in nine dairy farms located in the central and southwestern regions of Korea was 15.4% with the highest rate being 34.4%. Seasonal morbidity was higher during late winter (February) and early summer (June) with the highest rate observed in February (32.6%) followed by November (33.3%). Second-grade milk was most frequently found within one month postpartum (34.1%) while only 3.5% was found during the first 60∼90 days of lactating period (n=785, 5 herds). The morbidity increased thereafter (P<0.05) with the highest observed between 270∼300 days of lactation (36.1%). The acidity was not significantly different between second-grade (0.159±0.026%) and first-grade milk (0.158±0.027%). Blood serum analysis of 371 cows in the 14 dairy farms indicated that aspartate aminotransferase (AST) level was significantly higher (P<0.001) in cows producing second-grade milk while albumin was significantly lower (P<0.001) than cows producing first-grade milk. Total protein and triglyceride was also significantly low along with glucose, non-esterified fatty acid and blood urea nitrogen in cows producing second-grade milk. Statistical analysis including sensitivity, specificity and positive/negative prediction values showed that lactating cows with high AST, low albumin, total protein and triglyceride levels in the serum tended to produce second-grade milk. It was concluded that serological parameters, especially live functional and metabolic-related serum compositions (AST, albumin, total protein and triglyceride), were significantly influenced in cows producing second-grade milk.