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사육밀도에 따른 턱수염 도마뱀(Bearded dragon)의 부상 형태와 빈도 조사
전승엽,Jeon, Seung-Yeop 한국환경과학회 2022 한국환경과학회지 Vol.31 No.4
This study was conducted to determine the injury type and frequency of bearded dragons during single and group breeding according to stocking density, for 16 weeks. A total of 14 bearded dragons compromising three groups were selected for this study. Six and four bearded dragons bred in a cage of 45 cm × 45 cm × 45 cm were designed as group A and B, respectively. Group C was made of four partitions (20 cm × 20 cm × 20 cm) of equal size in the kennel, and the dragons, four in number, were reared alone. Injury type criteria were given 1 score each in 6 stages. Most of the injury types in group A were primary tail cutting, which was 1 point, depending on the score, except for 4 scores. The injury type of group A varied, that is 1, 2, 3, and 5 scores, and the pattern lasted for 2 to 9 weeks. After 10 weeks, the dragons showed no response to injury type, except 4 scores at 11 weeks and 2 scores at 14 weeks with a frequency of one, respectively. The representative injury types of the group B were primary tail cutting, which was 1 point, and the scores of the injury type from 2 to 11 weeks were the highest; the frequency of occurrence at 1 and 2 scores was 5 times and 3 times, respectively, and the frequency of occurrence at 3 scores was twice. In addition, 5 scores were found to have the lowest frequency of occurrence. Solitary breeding showed no response to the type of injury for 16 weeks. Consequently, single breeding with an appropriate stocking density did not affect stress, and it could be expected a positive aspect for pet welfare.
전기방사에 의한 섬유상 질화알루미늄 합성 및 특성 평가
전승엽,황진아,주제욱,전명표 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.7
Aluminum nitride fibers were synthesized by carbothermal reduction and nitridation of precursor fibers obtained by electrospinning. The starting materials used to synthesize the AlN fibers were Al(NO3)3・9H2O and urea. Polyvinylpyrrolidone with increasing viscidity was used as the carbon source to obtain a composite solution. The mixed solution was drawn into a plastic syringe with a stainless steel needle, which was used as the spinneret and connected to a 20 kV power supply. A high voltage was supplied to the solution to facilitate the formation of a dense net of fibers on the collector. The precursor fibers were dried at 100℃ and then heated to 1,400℃ for 1 h in a microwave furnace under N2 gas flow for the carbothermal reduction and nitridation. X-ray diffraction studies indicated that the synthesized fibers consisted of the AlN phase. Field emission scanning electron microscopy studies indicated that the diameter of the calcined fibers was approximately 100 nm. 질화알루미늄 (AlN) 나노섬유를 전기방사를 이용하여 열탄소 환원질화법으로 합성하였다. 방사용액을 제조하기 위한 출발 물질로서 금속염인 Al(NO3)3 수화물, 질화알루미늄 합성반응에서의 연료로 Urea, 방사를 위한 고분자 화합물인 PVP(Polyvinylpyrrolidone, 1300K)를 탄소원으로 이용한다. 출발물질의 용매로는 DMF가 첨가된 ethanol를 주로 한다. 용매로 DMF와 ethanol 비를 1:3 질량비로 하여 점도도 600cP에서 가장 이상적인 전기방사가 가능함을 확인하였다. 전기방사 섬유상을 얻기 위해 전기방사 장치의 인가전압을 20KV 까지 하여 유량 10um/min 로 전기 방사된 섬유상을 얻었다. 이후, 마이크로웨이브 열처리 방식으로 1400도 1시간 N2 분위기 3L/min 조건으로 하여 최종 합성된 평균직경 100nm인 질화알루미늄 나노 섬유를 XRD와 FE-SEM으로 확인하였다.
2P-199 The Synthesis of Size-Controlled Metal Nanoparticles and NIR Reflective Properties
전승엽,( A. A. Rokade ),김진모,손대희,박성수 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
The shielding of solar energy has drawn attention due to growing demands of environmental comfort and of improving the energy efficiency of buildings. The method of blocking infrared rays through absorption is widely used. However, since the absorption of infrared rays increases the temperature of the absorber and the room temperature, the cooling energy saving effect is reduced. To overcome these problems, there is a growing demand for materials that reflect infrared. In this study, we synthesized metal nanoparticles of various sizes according to various conditions and studied the reflection characteristics according to the size of metal nanoparticles. The materials were characterized by TEM, SEM and UV-Vis-NIR spectroscopy.