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精密測定 計器用 Stainless Steel의 諸性質에 미치는 熱處理의 影響
金善泰,安幸根,韓泰鍾 Natural Science Research Institute JEONJU UNIVERSI 1987 전주대학교 자연과학연구소 학술논문집 Vol.2 No.2
The changes of microstructure and hardness with the various heat treatments on the properties of Fe-13.36% Cr-0.37%C stainless steel for precision measuring gauge have been investigated. Type 420 stainless steel has the self-hardenability, because the nose of isothermal transformation diagram located greatly to the right. The highest hradness in the martensite martrix with undissolved carbide is obtained by oil and air cooling treatment after austenizing at 1000-1050℃, for 1/6-1/3hr. In case of low temperature tempering, internal stress is reduced without dissolution of martensite matrix, and hardness reduced slightly. In case of high temperature tempering, hardness is reduced greatly, because the martensite matrix is dissolved into a ferrite and carbide.
토당귀 종자의 형태적 특성과 발아와 입모율에 대한 저장방법,생장조절제 및 프라이밍 처리 효과
안희정,안복주,·김도현,·안영섭,·김영국,박춘근,이상원,·박충범·차선우,·송범헌, 忠北大學校 農業科學硏究所 2015 農業科學硏究 Vol.31 No.1
This study was conducted to have basic and applied informations to establish the cultivation method and to improve the cultivation techniques of Angelica gigas Nakai through investigating the rates of germination and seedling establishment with treatment of plant growth regulator and seed priming. The germination rates of round shape seed were about 0.3~12% higher than those of parallel shape. The germination rates with different storage durations were increased at the level of 25oC and 4oC with the storage days, while they were clearly higher at -20oC compared to those at 4oC and 25oC without the storage durations. With the results of germination rates with treating of plant growth regulator and seed priming, their rates with the round shape seeds were comparatively higher about 6% than those with parallel shape seed and they were increased with increasing of the storage durations. The germination rates were generally appeared higher with GA3 than did those with seed priming. The highest germination rate was appeared at 50 ppm GA3 of plant growth regulator and at -0.5 MPa PEG6000 of seed priming. The germination rates?ㅤ ?ㅤ of Angelica gigas were different with different temperature, storage durations and the treatments of plant growth regulator and seed priming. These results could be used according to different cultivating conditions.
Kim, Min Seon,Jo, Tae Geun,Yang, Minuk,Han, Jiyeon,Lim, Mi Hee,Kim, Cheal Elsevier 2019 Spectrochimica acta. Part A, Molecular and biomole Vol.211 No.-
<P><B>Abstract</B></P> <P>A novel Schiff base chemosensor <B>HMID,</B> ((E)‑1‑((2‑hydroxy‑3‑methoxybenzylidene)amino)imidazolidine‑2,4‑dione), have been designed and synthesized. Sensor <B>HMID</B> showed a selectivity to Zn<SUP>2+</SUP> through fluorescence enhancement in aqueous solution. Its detection limit was analyzed as 11.9 μM. Importantly, compound <B>HMID</B> could be applied to image Zn<SUP>2+</SUP> in live cells. Detection mechanism of Zn<SUP>2+</SUP> by <B>HMID</B> was suggested to be an effect of chelation-enhanced fluorescence (CHEF) by DFT calculations. Moreover, <B>HMID</B> could detect Cu<SUP>2+</SUP> with a change of color from colorless to pink. The selective detection mechanism of Cu<SUP>2+</SUP> by <B>HMID</B> was demonstrated to be the promotion of intramolecular charge transfer band by DFT calculations. Additionally, <B>HMID</B> could be employed as a naked-eye colorimetric kit for Cu<SUP>2+</SUP>. Therefore, <B>HMID</B> has the ability as a ‘single sensor for dual targets’.</P> <P><B>Highlights</B></P> <P> <UL> <LI> New Schiff-base chemosensor <B>HMID</B> was developed for detection of Zn<SUP>2+</SUP> and Cu<SUP>2+</SUP>. </LI> <LI> <B>HMID</B> can detect Zn<SUP>2+</SUP> through “turn on” fluorescence in living cells. </LI> <LI> <B>HMID</B> was used to detect Cu<SUP>2+</SUP> from colorless to pink though ICT mechanism. </LI> <LI> Chemosensor <B>HMID</B> could be used as a practical visible colorimetric test kit for Cu<SUP>2+</SUP>. </LI> <LI> Sensing mechanisms for Zn<SUP>2+</SUP> and Cu<SUP>2+</SUP> by <B>HMID</B> were explained by DFT calculations. </LI> </UL> </P> <P><B>Graphical Abstract</B></P> <P>[DISPLAY OMISSION]</P>
Determination of Fecal Shedding Rates and Genotypes of Swine Hepatitis E Virus (HEV) in Korea
KIM, Sung-Eun,KIM, Mi-Young,KIM, Do-Geun,SONG, Young-Jo,JEONG, Hyun-Jeong,LEE, Sang-Won,LEE, Joong-Bok,PARK, Seung-Yong,SONG, Chang-Seon,OH, Soon-Jin,YOO, Han-Sang,CHOI, In-Soo Japanese Society of Veterinary Science 2008 The Journal of veterinary medical science Vol.70 No.12
<P>Hepatitis E virus (HEV) infection induces an acute hepatitis or a subclinical disease in humans. It is known that HEV is a zoonotic agent and pigs are major reservoirs of HEV. This study was conducted to determine the fecal shedding rates of HEV in various age groups of pigs and identify the genotypes of swine HEV prevailing in Korea. A total of 565 fecal samples were collected from suckling piglets, post-weaning pigs, growing pigs, and sows at 12 swine farms. RT-PCR was used to detect the presence of swine HEV in the feces. Every swine farm examined in this study had HEV-infected pigs. The fecal shedding rates of the swine HEV at individual farms were in the range of 2.1-35.4%. The overall fecal shedding rate of HEV in individual pigs was 17.5%. The HEV shedding rates of suckling piglets, post-weaning pigs, growing pigs and sows in their feces were 6.3, 16.3, 38.0 and 9.3%, respectively. When the genotypes of swine HEVs identified in this study were determined, they were all grouped into genotype 3. They were further subdivided into subtype 3a together with human and swine HEVs isolated in the U.S.A.</P>
Low-temperature wafer-scale growth of MoS<sub>2</sub>-graphene heterostructures
Kim, Hyeong-U,Kim, Mansu,Jin, Yinhua,Hyeon, Yuhwan,Kim, Ki Seok,An, Byeong-Seon,Yang, Cheol-Woong,Kanade, Vinit,Moon, Ji-Yun,Yeom, Geun Yong,Whang, Dongmok,Lee, Jae-Hyun,Kim, Taesung Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.470 No.-
<P><B>Abstract</B></P> <P>In this study, we successfully demonstrate the fabrication of a MoS<SUB>2</SUB>-graphene heterostructure (MGH) on a 4 inch wafer at 300 °C by depositing a thin Mo film seed layer on graphene followed by sulfurization using H<SUB>2</SUB>S plasma. By utilizing Raman spectroscopy and high-resolution transmission electron microscopy, we have confirmed that 5–6 MoS<SUB>2</SUB> layers with a large density of sulfur vacancies are grown uniformly on the entire substrate. The chemical composition of MoS<SUB>2</SUB> on graphene was evaluated by X-ray photoelectron spectroscopy, which confirmed the atomic ratio of Mo to S to be 1:1.78, which is much lower than the stoichiometric value of 2 from standard MoS<SUB>2</SUB>. To exploit the properties of the nanocrystalline and defective MGH film obtained in our process, we have utilized it as a catalyst for hydrodesulfurization and as an electrocatalyst for the hydrogen evolution reaction. Compared to MoS<SUB>2</SUB> grown on an amorphous SiO<SUB>2</SUB> substrate, the MGH has smaller onset potential and Tafel slope, indicating its enhanced catalytic performance. Our practical growth approach can be applied to other two-dimensional crystals, which are potentially used in a wide range of applications such as electronic devices and catalysis.</P> <P><B>Highlight</B></P> <P> <UL> <LI> Practical growth for 2D MoS<SUB>2</SUB>-graphene heterostructure (MGH) was introduced. </LI> <LI> Low-temperature sulfurization of Mo thin film was realized by H<SUB>2</SUB>S plasma. </LI> <LI> As-grown MoS<SUB>2</SUB> film on graphene naturally contains large number of active sites. </LI> <LI> The MGH was shown enhanced electrocatalytic performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>