• 공업화학
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• 제3권4호
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• pp.710-716
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• 1992

에틸페닐카바메이트를 $120^{\circ}C$, 79 atm에서 전이금속촉매와 할로겐화 알칼리금속을 조촉매로하여 아닐린의 산화적 카르보닐화반응에 의하여 합성하였다. 산화제로서 산소를 사용하였으며 반응속도를 조사하고 활성화에너지를 추정하였다. 5시간 반응후 전환율은 100%, 선택도는 95%이었고 촉매로서는 Pd촉매가 Rh촉매보다 약간 효과가 좋았으며 조촉매로서의 효율은 KI>KBr>KCl 순이었다. $75^{\circ}C$에서 $120^{\circ}C$사이에서 온도의 증가에 따라 반응속도가 증가되었으며 반응은 겉보기 1차반응이었고 활성화 에너지는 5% Pd/C와 5% Rh/C에서 각각 5.647, 5,780 kcal/mol이었다.

• 한국농공학회지
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• 제24권4호
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• pp.92-98
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• 1982

The major objective of this study was to investigate the heat resistance of epoxy resin mortar. For this purpose, these tests of compressive and bending strength were accomp- olished with various heating temperature (40˚C, 60˚C, 80˚C, 100˚C, 120˚C), and with various mixing ratio (1: 2, 1: 4, 1: 6, 1: 8, 1:10, 1:12, 1:14). The exprimental resin was to be Epi-Bis type epoxy resin, which is widely used as construction materials. The results obtained are summarized as follows; 1. The variations of color tone started to begin at 60˚C, and it has come out very heavy at 120˚C. It was assumed that the decrement of weight resulted from carbonization were about 0.22% at 100˚C, and about 0.34% at 120˚C. 2. The compressive and bending strength were increased with temperature rise up to 80˚C, but these were made rapid decrease when the given temperature was over. And so, the mean decrement of compressive and bending strength at 120˚C reached up to 35.5% and 26.4%, respectively. 3. The regression equation between compressive and bending strength for epoxy resin mortar under heat exposure were obtained as follows; od=0. 371oc+39. 23 (r=0. 986) And the estimated value of bending strength was corresponded to about 37 percent in comparing with that of the compressive strength. 4. Consquently, the heat resistance temperature of epoxy resin mortar was to be around 80˚C, and it was generally very low values. But it was regarded that the epoxy resin mortar will not be difficult with materials of civil engineering works and agricultural structures.

• 한국재료학회지
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• 제6권9호
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• pp.943-949
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• 1996

카올린에서 추출된 황산알루미늄 용액으로부터 촉매담체용 r-AI2O3분말 합성에 대하여 연구하였다. 황산알루미늄 용액을 교반중의 에탄올(ethanol)에 적하하여 단일상(single phase)의 AI2(So4)3 18H2O석출물을 제조하고 이 석출물의 하소로부터 r-AI2O3분말을 합성하였다. 이 분말을 100$0^{\circ}C$에서 2시간 하소하였을 때 열적안정성을 보였으나, 120$0^{\circ}C$-2시간 하소에서 $\alpha$-AI2O3 로 전이하였다. r-AI2O3의 열적안정성에 미치는 BaO 첨가의 영향을 조사 연구하였다. 첨가량은 r-AI2O3에 대해서 1.0-6.0wt%로 하였다. BaO를 4.0wt%첨가한 시료는 AI2O3-BaO.6AI2O3(hexa-aluminate)혼합상생성으로 인하여 120$0^{\circ}C$에서 r-AI2O3의 전이를 방지하는데 효과적이었다. BaO를 4.0wt%첨가한 시료와 BaO를 첨가하지 않은 시료에 대하여 r-AI2O3$\longrightarrow$ $\alpha$-AI2O3전이에 따른 비표면적을 조사하여 보았다. 120$0^{\circ}C$-2시간에서 BaO 4.0wt% 첨가한 시료와 BaO를 첨가하지 않은 시료의 비표면적은 각각 95$m^2$/g과 50$m^2$/g을 유지하였다.

• Journal of Ginseng Research
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• 제39권3호
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• pp.274-278
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• 2015

Background: Steaming of ginseng is known to change its chemical composition and biological activity. This study was carried out to investigate the effect of different steaming time-scales on chemical constituents and antiproliferative activity of Vietnamese ginseng (VG). Methods: VG was steamed at $105^{\circ}C$ for 2-20 h. Its saponin constituents and antiproliferative activity were studied. The similarity of chemical compositions between steamed samples at $105^{\circ}C$ and $120^{\circ}C$ were compared. Results: Most protopanaxadiol and protopanaxatriol ginsenosides lost the sugar moiety at the C-20 position with 10-14 h steaming at $105^{\circ}C$ and changed to their less polar analogues. However, ocotillol (OCT) ginsenosides were reasonably stable to steaming process. Antiproliferative activity against A549 lung cancer cells was increased on steaming and reached its plateau after 12 h steaming. Conclusion: Steaming VG at $105^{\circ}C$ showed a similar tendency of chemical degradation to the steaming VG at $120^{\circ}C$ except the slower rate of reaction. Its rate was about one-third of the steaming at $120^{\circ}C$.

• Journal of the Korean Wood Science and Technology
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• 제47권1호
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• pp.40-50
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• 2019

The aim of this study was to investigate the effects of density, temperature, size, and grain direction on measurement of moisture contents (MC) of wood materials non-destructively. The MC of different sizes of solid wood, glulam, and CLT from larch (larix kaempferi, $560kg/m^3$) and pine (pinus koraiensis, $430kg/m^3$) were measured using the dielectric type and resistance type meters. The specimens were conditioned in the environmental chamber to be equilibrium moisture content (EMC) of 12 % and 19 %. When density setting in dielectric type meter was increased from $400kg/m^3$ to $600kg/m^3$, the MCs of specimen (S-L-100-E) were decreased from 13.4 % to 11.3 %. However, when wood group (WG) setting in resistance type meter was changed from WG1 to WG4, the measured MCs were increased from 9.2 % to 12.3 %. When temperature setting in resistance type meters was changed from 0 to $35^{\circ}C$, the MC was decreased from 17.0 % to 13.0 %. The MCs measured by dielectric type meter for larger specimens (S-L-100-E_11.3 %, G-L-240-E_11.7 % and C-L-120-E_12.8 %) were higher than those of small size specimens (S-L-30-E_8.7 %, G-L-150-E_10.3 %, and C-L-90-E_9.7 %). The MCs measured by resistance type meter for larger specimens (G-L-240-E_11.6 % and C-L-120-E_13.3 %) were also higher than those of small size specimens (G-L-150-E_10.4 %, and C-L-90-E_11.8 %). The resistance type meter was not affected by the grain direction but the dielectric type meter were affected by the grain direction. The MC measured by resistance type meter for G-L-120-E perpendicular to grain direction was 11.5 % and the measured MC parallel to grain direction was 11.3 %. The MC measured by dielectric type meter parallel to grain direction (12.1 %) was higher than that measured perpendicular to grain direction (10.7 %).

• 한국세라믹학회지
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• 제33권1호
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• pp.101-109
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• 1996

The mechanical propertieso f sintered AlN with the addition of alumina were investigated The flexural strength of the AlN dispersed ALON specimens was higher than that of ALON and fracture toughness showed similar tendency. The high-temperature flexural strength of specimens which 50 and 64.3 mol% alumina was added to AlN was constant up to 100$0^{\circ}C$ with about 290 and 420 MPa respectively but abruptly decreased at 120$0^{\circ}C$ In the specimens which contained 5 and 30mol% alumina the flexural strength increased to about 14% at 100$0^{\circ}C$ and did not decrease at 120$0^{\circ}C$ compared to at room temperature.

• 한국식품과학회지
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• 제23권3호
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• pp.366-369
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• 1991

압출성형가공(extrusion cooking)에 의한 단백질의 조직화 메카니즘을 해석하기 위해 난백lysozyme을 고압조건에서 가열처리한 모델계 시료의 불용화 현상과 분자량적인 변화를 조사하였다. $100,\;300,\;600\;kg/cm^2$의 고압조건에서 $70,\;120,\;150^{\circ}C$로 가열온도가 높은 시료일수록 용해성은 감소하였으며 $200^{\circ}C$로 가열한 시료에서는 처리압력이 증가할수록 용해도가 현저히 감소하였다. $150^{\circ}C$와 $200^{\circ}C$로 가열처리한 시료에서는 dimer 이상의 polymer가 생성되었고 monomer보다 분자량이 작은 band의 생성도 인정되었는데 그 추정 분자량은 약 $6,000{\sim}9,000$의 분포이었으며 이 보다 저분자의 peptide는 존재하지 않았다. $120^{\circ}C$에서 가열한 시료의 고분자 형성은 주로 분자간 disulfide 결합에 의한 것이었고 $150^{\circ}C$ 이상으로 가열한 시료의 고분자 형성에는 disulfide결합 이외의 분자간 결합도 상당수 관여한 것으로 판단된다.

• Korean Chemical Engineering Research
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• 제54권1호
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• pp.1-5
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• 2016

목질계 바이오매스를 이용하여 효소를 사용하지 않고 발효당을 얻기 위해 황산을 이용한 당화를 수행하였다. 바이오매스로는 pinus rigida와 palm농업 부산물인 EFB를 사용하였다. 산을 이용한 당화에서는 당의 과분해 생성물을 줄이기 위한 당화조건을 생각해 보아야 한다. 따라서 본 연구에서는 목질계 바이오매스를 이용한 2단 산당화를 수행하였다. 산을 이용한 1차 가수분해에서는 72 wt%의 황산을 이용하여 $80^{\circ}C$에서 반응시켰을 경우 가장 높은 당화율을 보였고 pinus rigida와 EFB 각각 11.49 wt%, 32 wt%의 당화율을 보였다. 이후 1차 가수분해에서 얻은 액상을 9~15 wt%의 산농도가 되도록 묽혀 $50{\sim}120^{\circ}C$의 온도로 2차 가수분해를 진행했다. 2차 가수분해시 9%의 황산농도와 $120^{\circ}C$의 온도조건에서 80분간 반응시켰을 때 최종 글루코오스 당화율은 pinus rigida의 경우 86.8 wt.% (39 g/L), EFB의 경우 95.3 wt%(32.4 g/L)를 얻을 수 있었다. 각 단계에서 분석된 결과는 물질수지를 통해 확인하고 당화 효율을 비교해 보았다.

• 한국기계가공학회지
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• 제13권2호
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• pp.131-136
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• 2014

In this paper, a fire resistance test was carried out in accordance with the change of the insulation conditions on the exposed side and unexposed side of a coaming to obtain the optimal insulation conditions for class H-120 insulation in connection with specimen1 of the preceding paper for an evaluation of the fireproof performance of fire dampers according to hydrocarbon fire conditions. In the test results, specimen2(88 mm, $171^{\circ}C$) met the class H-120 insulation conditions, but specimen3(76mm, $181^{\circ}C$) exceeded the thermal insulation acceptance criteria at 110 minutes. Therefore, specimen2(88 mm) represents the optimal insulation conditions as a possible lightweight materialas compared to specimen1. From a comparison of the test results, we concluded that the temperature increase of the coaming insulation surface was influenced by conductive heat from the bulkhead and that the coaming surface was influenced by radiant heat from the blade and coaming.

• 대한임상검사과학회지
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• 제36권2호
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• pp.98-109
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• 2004

The lower limit of detection, precision, setting method of target value, reportable range determination, recovery, linearity, and comparison study with another equipment was evaluated for the Toshiba-120FR chemistry autoanalyzer which was newly introduced at the Daejeon Veteran Hospital in Dec. 2003. Nineteen kinds of test for AST, ALT, ALP, LDH, GGT, TP, ALB, GLU, T-cho, T-bil, TG, UA, CAL, IP, AMY, HDL-C, LDL-C, Cre and BUN were performed to evaluate the lower limit of detection, precision, setting method of target value, reportable range determination, recovery, linearity, and comparison study with other equipment according to the NCCLS guidelines(EP5-A, EP6-P, EP9-A). The Toshiba-120FR autochemical analyzer showed good precision for all tested items. The data concerning the lower limit of detection, precision(total CV 0.47%~3.65%), setting method of target value, reportable range determination, recovery(93%~111%), linearity($R^2=0.997{\sim}0.999$), and comparison study(r=0.977~0.999) with other equipment was acceptable for all tested items. The results of evaluation for the Toshiba-120FR autochemical analyzer showed that this equipment could be used as an alternative to other equipment.