• 한국식품영양학회지
• /
• 제9권2호
• /
• pp.217-222
• /
• 1996

We studied about analyzing carbamate pesticides, organochlorine, organophosphorus pesticides simultaneously using by GC/MSD. For this, instead of HPLC which is generally used in analyzing carbamate pesticides, GC was used and all hydrogen of -NH group in carbamate pesticides were substituted for trifluoroacetyl group which is stable at heat And eight pesticide resdidues were not detected in nine samples circulated in the city.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 1997년도 춘계학술대회 논문집
• /
• pp.239-243
• /
• 1997

The heat generation is the most important problem in the motor integrated spindle. Double cooling jacket in necessary to reduce the thermal displacement and to get the stable temperature disribution for the housing. In this study, the effects of temperature distribution and thermal displacement for the spindle system according to the variation of cooling oil flow rate are investigated experimentally on the motor-integrated spindle with double cooling jacket system. The experimental spindel system is composed with the angular contact steel ball bearings, oil-air lubrication, air or oil jacket cooling system.

• 약학회지
• /
• 제16권2호
• /
• pp.108-112
• /
• 1972

S-Trifluoroacetoxy-trihalomethyl mercaptans were prepared by reacting metal salt of trihaloacetic acid with perhalomethyl mercaptans in the closed vessel. And besides, certain decomposed states of these products by heat and U.V. were studied by Infra red, N.M.R., molecular weight determination and chemical analysis methods. The results showed that the more fluorine substituted compounds were more stable than the less fluorine substituted ones.

• 한국생물물리학회:학술대회논문집
• /
• 한국생물물리학회 1997년도 학술발표회
• /
• pp.39-39
• /
• 1997

Native strain of inhibitory SERPINS (Serine protease inhibitors) is thought to be used in the facile conformational switch to play biological regulation. Many heat stable variants of $\alpha$$_1$-antitrypsin, a prototype of inhibitory serpins, increased their stability by reducing the native strain.(omitted)

• Journal of the Korean Wood Science and Technology
• /
• 제38권1호
• /
• pp.17-26
• /
• 2010

본 연구에서는 최근 새로운 활엽수 조림수종으로써 주목받고 있는 백합나무 제재목의 재질개선을 통한 부가가치 향상을 모색하고자 하였다. 이를 위해 이전 연구에서 삼나무의 재질개선 방법으로써 적용가능성이 확인된 $200^{\circ}C$ 내외의 고온 열처리방법을 적용하였으며, 백합나무 재색제어에 적합한 적정 열처리 조건 구명 및 열처리에 따른 재질변화 평가를 수행하였다. $200^{\circ}C$의 열처리 조건에서 백합나무 심 변재 사이의 재색차이가 줄어드는 경향을 확인하였으며, 이러한 경향은 처리시간이 증가함에 따라 더 크게 나타났다. 열처리재의 평형함수율이 무처리재에 비해 50% 정도 낮아 목재의 사용과정에서 나타나는 수분에 의한 성능저하를 예방할 수 있을 것으로 기대되었으나, 백합나무의 친환경 방부처리 기술로써 열처리의 적용 가능성은 삼나무에 비해 낮게 나타났다. 열처리재의 역학성능 변화는 삼나무와 거의 유사한 경향을 보였으며, 향후 백합나무의 용도를 개발하는데 있어서 이러한 물성 변화가 고려되어야 할 것이다. 열처리에 의한 물성변화의 원인을 규명하기 위한 미세구조 관찰 결과 에서는 특별한 변화를 확인할 수 없었으며, 추후 물성변화의 원인규명을 위한 추가적인 연구가 요구되었다.

• Journal of the Korean Wood Science and Technology
• /
• 제37권4호
• /
• pp.330-339
• /
• 2009

본 연구에서는 삼나무 재색제어에 적합한 적정 열처리 조건을 구명하고, 열처리에 따른 다양한 재질변화를 평가하고자 하였다. 국산 삼나무에 대한 온도제어 열처리를 통하여, $170^{\circ}C$ 이상의 열처리 조건에서 심변재 사이의 재색차이가 줄어드는 경향을 확인하였으며, 이러한 경향은 처리시간이 증가함에 따라 더 크게 나타났다. 열처리재의 평형함수율이 무처리재에 비해 50% 정도 낮아 목재의 사용과정에서 나타나는 수분에 의한 성능저하 문제를 예방할 수 있을 것으로 기대되며, 열처리가 부후균에 대한 내후성 증가에도 영향하는 것으로 확인됨에 따라 친환경 방부처리 기술로써 열처리의 적용에 대한 본격적인 연구가 필요할 것으로 판단된다. 열처리재의 역학성능은 무처리재에 비해 대체로 증가하는 것으로 나타났으나, 연성이 감소함으로 인하여 충격휨흡수에너지는 크게 감소하는 결과를 보여 열처리재의 용도를 결정하는데 있어서 이러한 물성 변화가 고려되어야 할 것이다. 열처리에 의한 물성변화의 원인을 규명하기 위하여 미세구조의 변화를 관찰하였으나 특별한 차이는 나타나지 않았다. 따라서 화학성분의 변화를 분석함으로써 물성변화의 원인을 규명하는 추가적인 연구가 필요할 것으로 여겨진다.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2001년도 춘계학술대회논문집D
• /
• pp.49-53
• /
• 2001

A conventional flame type gas combustion major portion of heat is transferred to the body by convection due to small radiant ability of the gas flame. Increasing the radiation component of heat flux in the combustion zone allows to augment the efficiency of gas utilization. Such effect can be reached by using radiative gas burner applied to metal mesh combustion. Basically the gas radiant burner consists of metallic mesh of high heat resisting steels. In terms of this regards, we have made the burner consisted of metal mesh and measured the radiative flame stability of natural gas/air mixture on the metal mesh burner. The pressure loss through the metal mesh is defined by pressure-velocity slope. The more increased the pressure-velocity slope of the metal mesh is, the wider the stable zone of radiave flame on the metal mesh burner is. And the augmentation of mixture flowrate through the metal mesh make narrow the permissible range of equivalence ratio.

• BMB Reports
• /
• 제42권12호
• /
• pp.812-816
• /
• 2009

To screen chaperone proteins from Schizosaccharomyce pombe (S. pombe), we prepared recombinant citrate synthase of the fission yeast as a substrate of anti-aggregation assay. Purified recombinant citrate synthase showed citrate synthase activity and was suitable for the substrate of chaperone assay. Several heat stable proteins including aspartyl aminopeptidase (AAP) for candidates of chaperone were screened from the supernatant fraction of heat-treated crude extract of S. pombe. The purified AAP migrated as a single band of 47 kDa on SDS-polyacrylamide gel electrophoresis. The native size of AAP was estimated as 200 kDa by a HPLC gel permeation chromatography. This enzyme can remove the aspartyl residue at N-terminus of angiotensin I. In addition, AAP showed the heat stability and protected the aggregation of citrate synthase caused by thermal denaturation. This study showed that S. pombe AAP is a moonlight protein that has aspartyl aminopeptidase and chaperone activities.

• Macromolecular Research
• /
• 제11권6호
• /
• pp.481-487
• /
• 2003

Polypyrrole (PPy) was coated sequentially by chemical and electrochemical methods on a woven fabric, giving rise to a fabric having high electrical conductivity. We investigated the effects of the preparation conditions on the various properties of the resulting fabric. The PPy-coated fabric with optimum properties was obtained when it was prepared sequentially by chemical polymerization at the elevated temperature of 100$^{\circ}C$ under a pressure of 0.9 kgf/$\textrm{cm}^2$ and then electrochemical polymerization with a 3.06 mA/$\textrm{cm}^2$ current density at 25 $^{\circ}C$ for 2 hrs with the separator plate. The surface resistivity of the resulting fabric was as low as 5 Ω/$\square$ .The PPy-coated fabric prepared under the optimum conditions showed practically applicable heat generating property. When electrical power was supplied to the fabric using a commercial battery for a mobile phone (3.6 V, LGLl-AHM), the temperature of the fabric increased very quickly from room temperature to ca. 55 $^{\circ}C$ within 2 min and was maintained for ca. 80 min at that temperature. The heat generating property of the fabric was extremely stable, exhibiting similar behavior over 10 repeated cycles. Therefore, we suggest that the PPy-coated fabric in this study may be practically useful for many applications, including flexible, portable surface-heating elements for medical or other applications.

• 대기
• /
• 제25권2호
• /
• pp.193-203
• /
• 2015

A large aperture scintillometer (LAS) was deployed with an optical path length of 2.1 km to estimate turbulent sensible heat flux (${\mathcal{Q}}_H$) over a highly heterogeneous urban area. Scintillation measurements were conducted during cold season in November and December 2013, and the daytime data of 14 days were used in the analysis after quality control processes. The LAS-derived ${\mathcal{Q}}_H$ show reasonable temporal variation ranging $20{\sim}160W\;m^{-2}$ in unstable atmospheric conditions, and well compare with the measured net radiation. The LAS footprint analysis suggests that ${\mathcal{Q}}_H$ can be relatively high when the newly built-up urban area has high source contribution of the turbulent flux in the study area ('northwesterly winds'). Sensitivity tests show that the LAS-derived ${\mathcal{Q}}_H$ are highly sensitive to non-dimensional similarity function for temperature structure function parameter, but relatively less sensitive to surface aerodynamic parameters and meteorological variables (temperature and wind speed). A lower Bowen ratio also has a significant influence on the flux estimation. Overall uncertainty of the estimated daytime ${\mathcal{Q}}_H$ is expected within about 20% at an upper limit for the analysis data. It is also found that stable atmospheric conditions can be poorly determined when the scintillometry technique is applied over the highly heterogeneous urban area.