Materials Literature
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용융중합에 의해 상업적으로 생산된 중점도급의 poly(butylene terephthalate)(PBT)를 이용하여 고상중합을 실시하였다. 고상중합에 따른 PBT의 분자량이 증가할수록 카르복실 말단기는 감소하였으며, 121℃, 상대습도 100%조건(PCT)에서 시간에 따른 카르복실 말단기의 변화 및 물성의 변화를 관찰하였다. PCT 시간에 따라 카르복실 말단기는 증가하였는데, 초기 카르복실 말단기가 적을수록 증가 기울기는 낮은 거동을 보였다. PCT 시간에 따른 인장강도, 충격강도, 및 굴곡강도는 일정 시간이 지나면 급격하게 감소하였는데, 초기 카르복실 말단기가 적…
피롤 단량체는 균일하고 접착력 있는 폴리피롤 고분자로 알루미늄 합금 전극 위에 성공적으로 전착되었다. 다양한 농도의 질산으로 산성화된 전해질 용액 안에서 전하보상 상대이온이면서 메트릭스의 역할을 하는 폴리스티렌설포네이트 고분자를 첨가하면 첨가량에 따라 폴리피롤 고분자의 표면 모폴로지와 전기적 특성이 변화됨을 보고한다. 일정한 전하 밀도(1 mAcmSUP-2/SUP)에서 수행된 전압-시간 중합 곡선은 폴리피롤이 초기 핵 생성 단계에서 2차원적인 성장으로 전이하는 전압 거동을 나타내었다. SEM-EDS 분석을 이용한 이 필름들의 특성은 전압-시간 곡선에서 예상되었던 것…
본 연구에서는 Nb₂OSUB5/SUB/SiO₂ 두개의 버퍼층위에 기판온도 (상온∼400℃) 에 따른 ITO 박막을 DC 마그네트론 스퍼터링 법으로 증착하여 전기적 및 광학적 특성을 조사하였다. 기판온도가 상승함에 따라 그레인 크기 증가에 기인한 결정성 향상 때문에 비저항이 낮아지는 경향을 나타내었다. 기판온도 400℃ 에서 증착한 ITO 박막이 3.03×10SUP-4/SUP Ω·cm 의 비저항과 86.6 Ω/sq. 의 면저항으로 가장 우수한 값을 나타내었다. 광학적 특성을 측정한 결과, 기판온도가 상승함에 따라 가시광 영역 (400∼800nm) 에서의 평균 투과도는…
Zinc(II) complexes of (benzoimidazolyl)amine ligands, N-(1H-benzoimidazol-2-ylmethyl)aniline (L1) and N-(1H-benzoimidazol-2-ylmethyl)-2-bromoaniline (L2), [Zn2(L1)2(OBz)4] (1), [Zn₂(L2)₂(OBz)₄] (2) and [Zn(L1)₂(OAc)₂] (3) have been employed in the ring-opening polymerization of lactides. The complexes were found to fo…
황을 포함하는 고리형 아크릴레이트 단분자를 사용하여 고굴절률의 공중합 아크릴고분자 4종을 합성하였다. 황을 포함한 7-각 고리, 1,3-dithiane, 1,3-dithiolane 유도체를 사용하여 4가지의 아크릴 단분자를 합성하였고, 이를 methyl methacrylate(MMA)와 중량비로 3:7의 공중합고분자를 합성하였다. 오존(O₃)과 3-chloroperoxybenzoic acid (m-CPBA)를 사용하여 고분자에 포함된 황을 산화시켜 각각 SO와 SO₂를 갖는 고분자를 얻었다. 적외선 흡수 분광법(FTIR)과 수소핵자기공명분광(1H NMR) 분석을 통…
A calcium source is necessary for calcite precipitation within soil particles by microbial decomposition of urea and a calcium chloride is usually used. The harmful environmental impact of calcium chloride on road, ground and plants is severe. In this study, an eggshell with vinegar is investigated for an environmenta…
Proteins are the principal executive biomolecules of life. Their existence is required to drive and regulate countless physiological and biochemical activities within the cell. The study of biochemistry and biology are therefore frequently concerned with monitoring the presence, distribution, and function of proteins.…
Interference between competing motor memories is well-documented in sensorimotor adaptation. Interference is typically assessed using an ABA paradigm wherein participants first adapt to one rotation (Task A), then to an opposite rotation (Task B), and finally are re-exposed to the original rotation (Task A). Interfere…
In the process of electron beam flue gas treatment (EBFGT), most energy is spent on NOx removal. The dose distribution in the reactor is not uniform and the flue gas flow pattern plays an important role in the process efficiency. It was found that proper construction of the reactor may increase the energy efficiency o…
Owing to the limitations of conventional synthesis methods for iron nanoparticles and its wide range of environmental applications, there is a need to develop green synthesis protocols by exploring newer biological resources. In this study, for the first time, Turmeric ( Amaranthusspinosus L.) leaves were used to synt…
Based on the second generation wavelet and information entropy, in this paper, we recognize the partial discharge pattern using the second generation wavelet (SGWT) and adaptive BP. Firstly, feature extraction of discharge signals are obtained using the SGWT and information entropy. Then, the extracted features are fe…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
In view of lack of literature data on the constituents of medicinal plants used in Sudanese ethno medicine , the present study was designed to identify the constituents of the fixed oil from roots of Sudanese Maerua pseudopetalosa.This important plant is used traditionally in Sudanese ethno medicine . GC-MS analysis r…
ETUDE INTROQUCIION Considérons un gaz comprimé à l'état liquide dans une enceinte si nous lui appliquons une détente suffisamment brusque 1 et *amenant à une pression où il devrait normalement être à l'état gazeux, il demeure à l'état liquide ou encore en n surchauffe "cet état se modifie, et l 1 ébullition sera provo…
CO2 has an enormous impact on the environment. Increase in CO2 concentration in the atmosphere is found to be a key factor that degrades air quality significantly and leads to global warming. Thus, CO2 concentration has become an important indicator to tell the degree of air pollution. How to detect CO2 at a very low…
Problem of the determination of the composition of high-purity rare-earth metal salts is discussed. Prospects of the application of direct chemical methods to the determination of the water content of crystal hydrates of rare-earth metal salts used in the GET 173-2013 State Primary Standard of Mass Fraction and Mass (…
Controlled synthesis is always expected in nanoscale structures and phosphorous nanotubes with predefined chiralities are very important to electronic devices with tunable bandgap. Here, we demonstrate by molecular dynamics simulations incorporating theoretical analysis that a zigzag phosphorene nanoribbon can be asse…
The performances of sodium nitrite and dimethylethanolamine (DMEA) inhibitors have been compared in mitigating corrosion of rebar steels in simulated pore solution containing sea water and carbonates. The simulated solution was prepared by dissolving saturation amounts of alkali hydroxides and sulphates in sea water a…
A method and algorithm of identification of physical and thermophysical parameters of the thin-walled systems under external influence is considered. It is suggested to determine unknown descriptions of material from the decision of inverse problem of thermoelasticity with the use of different ways of approximation of…
EDITORIAL This issue of A&G is something of a celebration of radio astronomy, with a focus on the observations coming from the upgraded e-MERLIN, now providing radio images – such as the one on our cover – enhancing our view of black holes, jets and other high-energy phenomena. But e-MERLIN is just the start. The Squa…