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Methylcyclohexane과 Methyl Acetate의 초음파 흡수측정
배종림,김상한 대구대학교 (한사대학) 산업기술연구소 1992 産業技術硏究 Vol.11 No.-
Methylcyclohexane의 축-적도형 이성체간 및 methyl acetate의 cis-trans형 이성체간의 신뢰성 높은 활성화에너지(△H^(*))와 에너지차(△H)를 구하기 위해 초음파흡수측정을 주파수 0.1-10MHz, 온도 5-60℃에 걸쳐 행하였다. 측정법으로는 0.1-10MHz의 범위에서 정확도 좋게 초음파흡수측정이 가능한 plano-concave공명법을 사용하였다. 그 측정결과 methylcyclohexane과 methyl acetate이성체간 활성화에너지를 각각 △H^(*)=10.0kcal/mol, 6.6kcal/mol으로, 이성체간의 에너지차를 각각 △H=1.8kcal/mol, 3.4kcal/mol으로 구하였다.
Bovine serum albumin수용액의 초음파측정
배종림,박성배,김상한 대구대학교 (한사대학) 산업기술연구소 1992 産業技術硏究 Vol.11 No.-
단백질수용액중의 초음파흡수mechanism을 규명하기 위하여 pH7의 소혈청 albumin(BSA)수용액의 초음파흡수측정을 주파수 100kHz에서 1600MHz에 걸쳐 행하였다. 측정방법은 plano-concave공명법(0.1-10MHz), Bragg반사법(12-100MHz)과 고분해능Bragg반사법(120-1600MHz)을 사용하였다. pH7에서의 초음파흡수스퍽트럼은 Davidson-Cole분포식의 거울상인 분포함수를 사용한 완화곡선과 일치하였다. 이 완화현상을 BSA분자의 수화평행에 의한 것으로 해석하였다.
초음파 spectroscopy 시스템을 이용한 액정의 상전이 변화에 관한 연구
배종림,박성배,신영남 대구대학교 기초과학연구소 1998 基礎科學硏究 Vol.15 No.2
A new measuring system for ultrasonic spectroscopy was constructed, utilizing PVDF polymer films as wideband transducers. In a test of its performance, this measuring system was successfully applied to study of the nematic-isotropic phase transition in MBBA liquid crystal. We could be confirmed that the phase transition in MBBA is 47℃. These results shows that the spectroscopy with PVDF transducers takes advantage of studying the phase transition phenomena in liquid crystals.
Poly(sodium 4-styrenesulfonate)과 물의 혼합물에 대한 초음파 흡수측정
이명하,배종림 大邱大學校附設 基礎科學硏究所 2004 基礎科學硏究 Vol.21 No.1
Ultrasonic absorption coefficient in the frequency range of 0.2-2 MHz were measured in of poly(sodium 4-styrenesulfonate) aqueous solution for the concentration range of 5% to 25% by weight. The high-Q ultrasonic resonator method was used for the absorption coefficient at 20℃. The ultrasonic relaxation in poly(sodium 4-styrenesulfonate) aqueous solutions, which may be the result of structural fluctuations of polymer molecules such as the segmental motion of the polymer chains, was observed. Both the absorption and the shear viscosity increased with the poly(sodium 4-styrenesulfonate) concentration, but decreased with temperature.
Poly(acrylic acid)와 물의 혼합물에 대한 초음파 음속측정
이명하,배종림 大邱大學校 基礎科學硏究所 2000 基礎科學硏究 Vol.17 No.2
Ultrasonic velocity at 3 MHz and shear viscosity was measured in an aqueous solution of poly(acrylic acid) over the temperature range of 10~90℃, and the concentration range of 5 to 25% by weight. The velocity exhibits a maximum value at approximately 60, 62, 64, 68 and 70℃ in 25, 20, 15, 10, and 5% concentration solutions, respectively. The ultrasonic velocity increase with concentration at a given temperature. The shear viscosity decreased with temperature and increased with concentration.
김정구,배종림 大邱大學校附設 基礎科學硏究所 1998 基礎科學硏究 Vol.14 No.2
고분자 압전 필름인 PVDF를 이용하여 단일박막과 이층박막의 초음파 변환기에 대해 impulse 응답특성과 AC 펄스에 대한 삽입손실의 주파수 특성을 이론식으로 계산하여 확인하여 보았다. 그 결과 impulse 응답특성은 aluminum을 backing 물질로 하였을 경우 air backing에 비하여 short pulse를 나타내었으며, 단일박막의 변환기가 이층박막에 비하여 short pulse일음 알 수 있었다. 또한 삽입손실을 이용하여 주파수 특성을 조사한 결과 이층 박막의 변환기가 단일박막에 비하여 광대역의 특성을 나타냄을 알 수 있었다. We have studied response properties of ultrasonic transducer with multi-layer piezoelectric polymer films [poly (vinylidene fluoride)]. When impulse wave was applied to the ultrasonic transducer, the dependence of the response properties was investigated theoretical calculations. The transducer of one-layer shows short impulse response better than double-layers. When the insertion loss was calculated theoretically to the PVDF multi-layer transducers. The frequency character of double-layer show wideband better than one-layers.
PVDF 초음파 변환기를 이용한 고분자 물질의 초음파 spectroscopy에 관한 연구
김정구,배종림 大邱大學校附設 基礎科學硏究所 1998 基礎科學硏究 Vol.15 No.1
We fabricated ultrasonic spectroscopy system that can be study on properties of matter for a medium using PVDF ultrasonic transducer. A thing of this sort has the advantage of frequency properties compared with existing ultrasonic spectroscopy system. It is shown that our new ultrasonic spectroscopy system with PVDF ultrasonic transducer can successfully classify PE, PC, PMMA, PYFE polymers with the attenuation of ultrasonic spectra, and PTFE exhibits the most of absorption coefficient. We could be confirmed existence and size of bubbles in the inside of PMMA. These results shows that the spectroscopy system with PVDF transducer takes advantage of NDT instruments.
광 회절 초음파 공명법에 의한 methyl acetate의 cis-trans의 회전이성 완화의 연구
김신환,배종림 大邱大學校附設 基礎科學硏究所 1998 基礎科學硏究 Vol.15 No.2
Ultrasonic absorption measurements in methyl acetate have been carried out over the frequency range 0.1 - 10 MHz at temperature of 5-30℃ using a high-Q ultrasonic resonator method using optical diffraction which is useful for ultrasonic relaxation around 1 MHz. The results showed a typical spectrum of a single relaxation process, from which the relaxation frequency was determined. The temperature dependence of relaxation frequency gives the activation enthalpy(ΔH^(#)) between axial and equatorial isomers of methyl acetate, which are ΔH^(#)=6.6 kcal/mol.
Jong-Rim Bae,Jeong Koo Kim,이창우 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.2
Adenosine 3',5'-cyclic monophosphate (cAMP) is a second messenger responsible for a multitude of cellular responses. In this study, we utilized β-cyclodextrin (β-CD) as an artificial receptor with a hydrophobic cavity to elucidate the inclusion kinetics of cAMP in a hydrophobic environment using the ultrasonic relaxation method. The results revealed that the interaction of cAMP with β-CD followed a single relaxation curve as a result of host-guest interactions. The inclusion of cAMP into the β-CD cavity was found to be a diffusion-controlled reaction. The dissociation of cAMP from the β-CD cavity was slower than that of adenosine 5'-monophosphate (AMP). The syn and anti glycosyl conformations of adenine nucleotides are considered to play an important role in formation of the inclusion complex. Taken together, our findings indicate that hydrophobic interactions are involved in the inclusion complex formation of cAMP with β-CD and provide insight into the interactions of cAMP with cAMP-binding proteins.