Materials Literature
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This study examines conductive noise in long distance cables in a subsea environment. The inverters currently used in subsea plants generate conducted noise, which is the cause of damage and insulation failure of electric motor bearings. In particular, it is important to analyze the characteristics of transient voltag…
CAB는 광학적 특성이 우수한 생분해성 수지이나 취약한 가공성으로 인해 필름 어플리케이션에 제한되어 있다. 본 실험에서는 비교적 가공성이 우수한 폴리락틱산을 이용하여 CAB의 가공성을 향상시키고, 충격보강제 도입으로 기계적 물성을 보완하고자 하였다. 이전 실험에서 PLA/CAB binary 블렌드의 PLA75CAB25조성이 상용성을 보이는 것을 확인하였으므로 PLA75CAB25 조성에 한하여 충격보강 연구를 수행하였다. 이축압출기를 이용하여 충격보강제를 도입하고, $140^{\circ}C$ (hopper)- $200^{\circ}C$ (die)의 온도 범위에서 20…
In the present study, a candid approach using mechanical oxidation, for modification of multi-walled carbon nanotubes (CNTs) has been utilized, and its advantages over conventional acid oxidation methods have been established. Higher concentration of acidic groups was found in case of mechanically oxidized CNTs (i.e.,…
Quantum Information![Figure][1] Artist's view of a diamond defect PHOTO: WOLFGANG PFAFF Quantum information processing relies on the ability to store, manipulate, and propagate information encoded in quantum states of matter. Doing so, however, may destroy or compromise these delicate quantum states. Pfaff et al. pres…
Carbon Nanotubes (CNTs) filled with metals can be used in capacitors, sensors, rechargeable batteries and so on. In this study, the process of Nickel filling into single wall CNTs was studied by molecular dynamics (MD) simulation. Three models consisting of Nickel atoms and CNTs were established. These models were coo…
Photovoltaics Perovskite films received a boost in photovoltaic efficiency through controlled formation of charge-generating films and improved current transfer to the electrodes. Zhou et al. lowered the defect density of the film by controlling humidity while the perovskite film formed from lead
나일론66/실리케이트 복합체를 자동차 부품 소재로 적용하기 위해서 충격특성 개선에 대한 연구가 요구된다. 이축압출기(twin screw extruder)를 이용하여 나일론66/실리케이트 복합체를 실란계열의 ${\gamma}$ -APS로 처리한 실리케이트 사용과 MAH가 그라프트된 옥텐계 ${\alpha}$ 올레핀을 첨가한 경우로 하여 제조하였다. 실란처리된 실리케이트의 화학구조는 적외선 분광기(FT-IR)을 이용하여 측정하였고, 나일론66/실리케이트 복합체의 열적특성, 실리케이트 삽입여부 및 아이조드 충격강도를 DSC, TGA, XRD, 그리고 Izod 시험기를 이…
The on-line partial discharge (PD) in stator windings of air-cooled gas turbine (GT) generator (119.2MVA, 13.8kV) is measured and analyzed in this paper. This generator was designed by global vacuum pressure impregnation (VPI). The generator failed two times at top bar (16T) of phase B in the stator slot. Six epoxy-mi…
This paper discusses study of torque ripple minimization employing an improved TDF(torque distribution function)-based instantaneous torque control to reduce acoustic noise and vibration problem of the SRM. As the flux linkage of the SRM is a nonlinear function of phase current and rotor position, design of optimal co…
In 1934, Arthur Lindo Patterson showed that a map of interatomic vectors is obtainable from measured X-ray diffraction data without phase information. Such maps were interpretable for simple crystal structures, but proliferation and overlapping of peaks caused confusion as the number of atoms increased. Since the peak…
Introduction The quest to mimic nature is now reaching a new chapter. Whereas in the past, structural and functional characteristics served as inspiration for designs and materials, with attention given to mesoscopic and, perhaps, microscopic aspects, the arsenal of new experimental techniques and computational method…
Deliberately introducing defects into photonic crystals is an important way to functionalize the photonic crystals. We prepare a special large-scale three-dimensional (3D) photonic crystal (PC) with designed defects by an easy and low-cost method. The defect layer consists of photoresist strips or air-core strips. Fie…
In this study, the reducing agent hydrazine and precipitator NaOH were used with NiCl 2 as a starting material in order to compound Ni-based material with spherical nano characteristics; resulting material was used as an anode for SOFC.Synthetic temperature, pH, and solvent amounts were experimentally optimized and th…
\n Neste trabalho, foi realizado o crescimento de nanotubos de carbono pela técnica de deposição química a vapor (CVD) térmica catalítica, utilizando-se filmes finos de níquel como material catalisador, gás metano (CH4) como fonte de hidrocarboneto e nitrogênio (N2) como gás de arraste. Amostras processadas sobre film…
RH contain higher amount of carbon and silicon, which is an ideal source for the production of Silicon carbide (SiC). The aim of this work is to prepare SiC powder from rice husks (RH) by simple synthesis route. Silicon carbide is an important non-oxide ceramic which has diverse industrial applications. It is reinforc…
Physical properties of semiconductors are much more changed by disorder than metals or insulators, and are the most interesting field for fundamental research. The author has studied on several kinds of disordered semiconductor films. One of the author's contributable materials to this field is hydrogenated amorphous…
Introduction Many biological structures require light weight. The prime examples are birds, whose feathers, beaks, and bones are designed to maximize performance while minimizing weight. Other examples are plants, where the same requirements operate. Figure 10.1 illustrates two examples of structures designed to have…
The mixed compound NaH2(PO4)0.48(AsO4)0.52.H2O, which has been examined by Raman spectroscopy, XRD powder and dielectric, exhibits solid–solid phase transitions and one reversible solid–liquid phase transition. Besides, the investigation of dehydration behavior of sodium dihydrogenate phosphate-arsenate monohydrate wa…
A enzima nucleosídeo hidrolase (NH) se encontra largamente distribuída na natureza e, por não ter sido encontrada ainda em mamíferos, tem sido vista como um alvo ideal para a quimioterapia seletiva de doenças parasitárias e infecções bacterianas como o antraz. Apesar da disponibilidade de quimioterapia contra o antraz…
By introducing higher order strain gradient terms and an internal length parameter (the gradient elastic coefficient) into the constitutive stress-strain relation for the analysis of a bar, a corresponding elastic modulus is herein derived, which includes the classical and gradient elastic terms. With this, the micro-…