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Adipic dihydrazide 말단기 도입에 따른 수분산성 폴리우레탄프리폴리머의 제조와물성
김관영,최희성,노시태 한국공업화학회 2003 응용화학 Vol.7 No.1
Polyurethane dispersions(PUD) were prepared from IPDI, PHMCD, DMPA as anionic site, and ADH as end-capping.This prepolymers were dispersed in the aqueous phase by neutralization emulsification. The polyurethane dispersions were electrostatically stabilized with carboxyl group incorporated into their particles, which were neutralized by TEA(triethylamine).The lhysical properties of aqueous PU prepolymer were investigated by differential scanning calorimetry (DSC), gel permeation chromatography (GPC), dynamic light scattering (DLS), and Rheometer.This procedure contains the effect of molecular weight on the particle size of PUD and on the viscosity were investigated.As the molecular weight of PUDs increascd the particle size and viscosity is not changed.
Hudaya, Chairul,Ahn, Minjeh,Oh, Si Hyoung,Jeon, Bup Ju,Sung, Yung-Eun,Lee, Joong Kee Elsevier 2018 Journal of industrial and engineering chemistry Vol.64 No.-
<P><B>Abstract</B></P> <P>Despite the advantage of chemical vapor deposition (CVD) for realization of large area epitaxial growth of graphene on transition metal catalysts, both etching and transfer process of CVD-grown graphene sheets still remain a big challenge. Here we demonstrate the formation of multilayer graphene (MLG) sheets tailored from C<SUB>60</SUB> thin films on the top of Si/Ni substrate without etching and transfer steps based on Ni films. This self-assembled process separates the MLG sheets from the conductive Ni catalyst, embarking a possibility for direct characterizations of MLG sheets. The fine-tuned C<SUB>60</SUB> films (30nm) are transformed into approximately 17 MLG sheets, thus making it large-area MLG sheets for a variety of direct applications.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Si-Jung Song,Tae-Ho Jeong,Jung-Wha Moon,Han-Vit Park,Si Yung Lee,Kyoung-Hwan Koh 대한견주관절의학회 2018 대한견주관절학회지 Vol.21 No.1
Background: This study was undertaken to compare the outcome of supervised and home exercises with respect to range of motion (ROM), pain, and Single Assessment Numeric Evaluation (SANE). We further correlated the ROM recovery and pain reduction as well. Methods: The study included 49 patients who underwent arthroscopic rotator cuff repair. Rehabilitation was initiated after 4 weeks of immobilization. A total of 29 patients performed supervised exercise 3 times a week. Standardized education and brochures for review were provided to the remaining 20 patients who insisted on home rehabilitation. Statistical analysis was performed for comparing pain Numerical Rating Scale (NRS), SANE, and ROM. In addition, we also evaluated the correlation between pain and ROM. Results: Comparison of the two groups revealed no significant differences in forward flexion, internal rotation, abduction, and pain NRS. However, SANE at the 9th week (63.8 vs. 55.0, p=0.038) and improvement of external rotation from the 5th to the 9th week (17.6 vs. 9.3, p=0.018) were significantly higher in the supervised exercise group as compared to the home exercise group. Correlation of pain NRS with forward flexion, external rotation, internal rotation and abduction were statistically not significant (correlation coefficient=0.032 [p=0.828], -0.255 [p=0.077], 0.068 [p=0.642], and -0.188 [p=0.196], respectively). Conclusions: The supervised rehabilitation after arthroscopic rotator cuff repair showed better improvement in external rotation and higher SANE score after 4 weeks of rehabilitation exercise. However, no statistically significant correlation was observed between the recovery of ROM and short-term pain relief.
성시융(Si-Yung Seong),신은철(Eun-Cheol Shin) 한국지반신소재학회 2015 한국지반신소재학회 논문집 Vol.14 No.2
기존의 비탈면녹화공법인 식생기반재취부공법은 결합력의 부족이나 건조화, 유기물의 부족 등의 문제점들을 보이고 있다. 특히 비산이 심한 지역의 비탈면은 식생피복율이 현저히 떨어지고 시간이 경과함에 고사율이 증가되어 피복율이 더 저하되고 또다시 침식 및 비산이 증가하는 악순환이 이루어지고 있는 상황이다. 따라서 본 연구에서는 침식이나 비산에 저항하기 위해 친환경 토양안정재를 적용하고, 적정 배합비 결정을 위해 장기침수시험과 유수저항시험을 실시하였다. 친환경토양안정재와 기존의 녹화토기반재를 활용한 장기침수시험결과, 토양안정재의 혼합율 0%는 30시간, 2%는 40일 후 100% 붕괴가 발생되었으며, 4% 이상의 혼합비에서는 실험종료시까지 시료의 원형이 그대로 남아 있어 2% 이상의 토양안정재가 극한 조건에서도 형상을 유지하는데 영향을 줄 수 있는 혼합비임을 확인하였다. 또한, 식생기반재의 구조적 안정성을 평가하기 위해 인공강우시험을 40, 45, 55° 경사비탈면에 대해 실시하였으며, 토양안정재의 혼합비 0, 4, 8%에 대해 유수저항시험을 실시하고 침식저항 능력을 평가하였다. 실험결과, 토양안정재의 혼합에 따라 유실률이 급격히 감소하는 경향을 보이는 등 비산을 방지하거나 우수에 의한 침식에 저항하기 위해 적용한 친환경 토양안정재가 큰 유실감소효과를 거둘 수 있을 것으로 판단된다. This paper describes vegetation based soil-media hydroseeding measures that have been previously applied as slope revegetation methods show problems such as insufficient binding force, drying, and insufficient organic matter. In particular, in the case of slope faces in regions where scattering is severe, a vicious circle exists in which remarkably low vegetation cover rates and increases in withering rates over time lead to further decreases in vegetation cover rates, which lead to further increases in erosion and scattering. Therefore, in the present study, environment friendly soil stabilizers were applied for resistance against erosion or scattering and engineering evaluations such as long-term immersion tests and flow resistance tests were conducted to determine appropriate mixing ratios. According to the results of long-term immersion tests utilizing environment friendly soil stabilizers and existing greening soil based materials, 100% collapse occurred at 30 hours and 40 days in the case of soil stabilizer mixing ratios of 0% and 2%, respectively. While the original form of the samples remained intact until the experiment was completed in the case of mixing ratios exceeding 4% indicating that 2% or higher soil stabilizer mixing ratios could affect the maintenance of forms even under extreme conditions. In addition, artificial rainfall tests were conducted on 40, 45, and 55 degree slope faces to evaluate the structural stability of vegetation based materials. Flow resistance tests were conducted on soil stabilizer mixing ratios of 0, 4, 8% to evaluate erosion resistance capability. Based on the results of the tests, environment friendly soil stabilizers applied for prevention of scattering or resistance against erosion by rainwater are considered to provide large effects to reduce losses and loss rates showed a tendency of decreasing rapidly when soil stabilizers were mixed.