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Polarized Raman spectroscopy of Cu-poor and Zn-rich single-crystal Cu<sub>2</sub>ZnSnSe<sub>4</sub>
Nam, Dahyun,Kim, Jungcheol,Lee, Jae-Ung,Nagaoka, Akira,Yoshino, Kenji,Cha, Wonsuk,Kim, Hyunjung,Hwang, In Chul,Yoon, Kyung Byung,Cheong, Hyeonsik American Institute of Physics 2014 APPLIED PHYSICS LETTERS Vol.105 No.17
Nam, Dahyun,Cho, Soyeon,Sim, Jun-Hyoung,Yang, Kee-Jeong,Son, Dae-Ho,Kim, Dae-Hwan,Kang, Jin-Kyu,Kwon, Min-Su,Jeon, Chan-Wook,Cheong, Hyeonsik Elsevier 2016 Solar Energy Materials and Solar Cells Vol.149 No.-
<P><B>Abstract</B></P> <P>We found a clear correlation between the solar conversion efficiency and the distribution of the ZnS secondary phase in Cu<SUB>2</SUB>ZnSnS<SUB>4</SUB> (CZTS) solar cells. Five CZTS solar cells were prepared by the two-step process in which sputtered precursor multilayers were sulfurized at different temperatures. In higher efficiency solar cells, the ZnS secondary phase was found to accumulate near the interface between CZTS and MoS<SUB>2</SUB> formed on top of the Mo layer. It was also found that a solar cell with a higher efficiency showed weaker ZnS Raman signal in the MoS<SUB>2</SUB> layer. The highest conversion efficiency of 7.5% was obtained from a solar cell prepared at a sulfurization temperature of 570°C, in which no ZnS was detected in the MoS<SUB>2</SUB> layer. We suggest that in order to obtain a high efficiency CZTS solar cell, it is critical to find a condition that keeps ZnS from the MoS<SUB>2</SUB> layer.</P> <P><B>Highlights</B></P> <P> <UL> <LI> ZnS in the MoS<SUB>2</SUB> layer of Cu<SUB>2</SUB>ZnSnS<SUB>4</SUB> solar cells reduces the efficiency. </LI> <LI> In a high efficiency cell, no ZnS was detected in the MoS<SUB>2</SUB> layer. </LI> <LI> ZnS tends to accumulate in the CZTS layer near the CZTS/MoS<SUB>2</SUB> interface. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
스투키의 가열에 의한 생체 신호 변화 특성에 대한 실험 연구
남다현,김정배,Nam, Dahyun,Kim, Jeongbae 한국교통대학교 융복합기술연구소 2016 융ㆍ복합기술연구소 논문집 Vol.6 No.1
An experiment was performed to show the bio-signal characteristics of the Stuckyi when was heated. To measure the bio-signal of the plant, this study used the electrode with copper(+) and constantan(-). The electrode was directly inserted into the Stuckyi stems. And used T-type thermocouple to measure the inside temperature of the Stuckyi. During the experiments, room temperature also measured with T-type thermocouple. Heating was made with hair dryer periodically that 3 times turned on for heating 5 min and off for non-heating 25 min. Under the situation, the responses of the Stuckyi including voltage potential and inside temperature were measured using data logger(HP-34970A) according to the distances(15cm, 30cm, 45cm) between hair dryer and the plant. Through the experiments, We knew that the inside temperature has similar level and behavior with the room temperature at normal state. And during heating period, the inside temperature and the potential were also simultaneously increased sharply. From the experiments, we revealed that the measuring system of bio-signal of the plant being proposed in this study can be useful to show the Characteristics of the plants.
Koo, Uk,Nam, Kung-Woo,Ham, Ahrom,Lyu, Dahyun,Kim, Bora,Lee, Sung-Jin,Kim, Kyeong Ho,Oh, Ki-Bong,Mar, Woongchon,Shin, Jongheon Kluwer Academic/Plenum Publishers 2011 Neurochem Res Vol.36 No.11
<P>Dopamine (DA), as a neurotoxin, can elicit severe Parkinson's disease-like syndrome by elevating intracellular reactive oxygen species (ROS) levels and apoptotic activity. We examined the inhibitory effects of 3α-acetoxyeudesma-1,4(15),11(13)-trien-12,6α-olide (AETO), purified from the leaves of Laurus nobilis L., on DA-induced apoptosis and α-synuclein (α-syn) formation in dopaminergic SH-SY5Y cells. AETO decreased the active form of caspase-3 and the levels of p53, which were accompanied by increased levels of Bcl-2 in a dose-dependent manner. Flow cytometric and Western blot analysis showed that AETO significantly inhibited DA-induced apoptosis along with suppression of intracellular tyrosinase activity, ROS generation, quinoprotein, and α-syn formation (P?<?0.01). These results indicate that AETO inhibited DA-induced apoptosis, which is closely related to the suppression of intracellular tyrosinase activity and the formation of α-syn, ROS, and quinoprotein in SH-SY5Y cells.</P>