Materials Literature
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One of the effective methods to break the chips is using complex groove in actual cutting. The chips of cylindrical shell material 2.25Cr-1Mo-0.25V in heavy-duty cutting are hard to break and the viscosity of 2.25 Cr-1 Mo-0.25 V is big, and aiming to this, the chip shapes of cylindrical shell material is analyzed thro…
불소가 함유된 폴리우레탄 코팅 용액을 과불화 알코올, toluene diisocyanate와 polycarbonate diol을 출발물질로 사용하여 합성하였다. 이렇게 합성된 불소 함유 폴리우레탄 코팅 용액을 기재인 PC 위에 스핀 코팅 후 $120^{\circ}C$ 에서 열경화시켜 코팅 필름을 제조하였다. 제조된 코팅 필름의 물성을 FT-IR spectroscopy, UV-visible spectrometer, 접촉각 측정기와 연필경도 측정기를 사용하여 분석하였다. 과불화 알코올의 첨가는 코팅 필름의 발수성을 향상시켜, 물 접촉각을 $81^{\circ}C$ 에서…
The conditions (regimes of deposition and thermal treatment) for gas bubble formation in ferroelectric Pb(Ti1–y Zr y )O3 films have been determined by thermal desorption and electron and optical micros-copy. A mechanism of bubble formation has been proposed. This mechanism rests upon the notion that lead can form oxid…
The problem of acoustic scattering of a gaseous spherical bubble immersed within unbounded liquid surrounding is considered in this work. The theory of partial wave expansion related to this problem is revisited. A physical model based on the analogy between acoustic scattering and potential scattering in quantum mech…
Spherical Mumetal nanoparticles fabricated by the electrical wire explosion process in 1% solution of poly(acrylamide-co-acrylic acid) partial sodium salt as the explosion medium and capping agent to prevent particle agglomeration and control the size of nanoparticles. The structure, morphological features were studie…
Using Nb2O5, HF and polyvinyl alcohol as major materials, the nanoparticulate NbO2F was successfully prepared by hydrothermal method. The prepared samples were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), fourier transform infrared spectrometer (FT-IR), and UV-visible diffuse re…
충격하중을 받는 재료의 변형거동에 관한 연구는 공학 및 산업의 다양한 분야에서 관심 받고 있으며, 이들 기계/구조물 부재의 변형 및 파괴거동의 다수는 중간 변형률속도 영역에 해당하는 것으로 알려져 있다. 따라서 이러한 변형률속도역에서 동적변형거동을 고려하는 것이 설계의 필수조건이 되었다. 이들 영역은 준정적과 SHPB 시험장치를 이용하는 고 변형률속도의 중간 영역에 위치하고 있어서, 종래의 적당한 시험장치를 이용하여 중 변형률속도를 얻는 것이 용이하지 않았다. 따라서 중간 변형률속도역에서 재료의 변형 및 파괴거동에 관한 유용한 데이터의 보고는 제한적이다. 본 연구에…
In this paper, we proposed a broadband and polarization-independent negative refractive index (NRI) metamaterial structure for the terahertz range, which is composed of four heart-shaped split-ring resonators (HSRR) and two continuous wires printed on the two sides of a dielectric substrate respectively. The retrieved…
Based on an eco-friendly and cost-effective synthesis route, the controllable assembly of aromatic acids and Zn ions affords highly stable metal–organic frameworks, which show high-performance and long-lived room-temperature afterglow. Such materials, presented by X. Yang and D. Yan on page 897, can be used for energy…
최근에 저가의 고분자 전해질 연료전지(Proton Exchange Membrane Fuel Cells, PEMFC)용 비불소계 전해질 막 연구개발이 활발히 진행되고 있다. 본 연구에서는 sulfonated Poly (ether ether ketone) (sPEEK) MEA 내구성을 시험하기 위해 열화 가속화 기법을 이용하여 막과 전극이 동시에 열화되는 MEA 열화 실험을 진행하였다. 열화 전과 후에 I-V 분극곡선, 수소투과도, 전극 활성 면적, 막 저항과 부하 전달 저항을 측정하여 열화 전과 후를 비교하였다. sPEEK 막의 수소 투과도는 낮았지만, 저가습 OCV…
본 연구에서는 Multi-Walled Carbon Nanotube (MWCNT)와 니켈 분말을 포함하는 전기 전도성 복합체를 제조하여 물성을 비교하였다. 복합체 제조에 앞서, MWCNT 표면을 개질하여 카르복실기(-COOH)와 아미노기(-NH2)를 도입하였으며, 표면 개질 혹은 개질되지 않은 MWCNT와 니켈 분말을 diglycidyl ether of bisphenol A (DGEBA)에 분산하여 전기 전도성 복합체를 제조하였다. 그리고 triethylenetetramine (TETA)를 경화제로 사용하여 전도성 복합체와 혼합한 후, doctor blade법으로 코…
Photodynamic therapy (PDT) is a localized treatment modality, relying on both a photosensitizer and drug activation using a specific wavelength. Widespread use of PDT in brain tumor therapy has been partially hampered by non-targeted phototoxicity towards healthy tissue as well as inefficient delivery across the blood…
The integrated intensity of X-ray diffraction reflections has been measured for a series of epitaxial layers of AIII nitrides (GaN, AlN, AlGaN) grown on different substrates (sapphire, SiC) and characterized by different degrees of structural perfection. It has been shown that, despite a high density of dislocations a…
\n\t\t\t\t\tIn the automotive and other industries, the visual appearance of external surfaces is a key factor in perceived product quality. Traditionally, the quality of an automotive surface finish has been judged by expert human auditors. A set of 17 fibre-reinforced composite plates was previously manufactured to…
On page 4811, Q. Wang, and co-workers describe ferro-electric ceramic nanowire arrays, which exhibit a high electrocaloric effect under low applied electric fields. The prepared lead-free ceramic nanostructured array is highly bendable and stretchable, and retains its excellent electrocaloric response in rigorous mech…
Front Cover: The cover shows the superposition of ethylene polymerization rates with a Ziegler-Natta catalyst at 4 different polymerization times. At the end of each polymerization, we measured the molecular weight distribution (MWD) and average short chain branching frequency (SCB) across the MWD using gel permeation…
Silicon nanowire field-effect transistors (SiNW-FETs) were fabricated in a top–down process on wafer-scale. They can be regarded as nano-sized, long-channel, ion-sensitive fieldeffect transistor devices (ISFETs) and are offering a label-free sensing of DNA molecules based on the detection of the biomolecules' charges.…
Abstract This paper present results of optical spectroscopy studies of interactions of intense plasma streams with a solid target made of carbon fibre composite (CFC). The experiments were carried out within the Rod Plasma Injector (RPI) IBIS facility. The optical measurements were performed first for a freely propaga…
Sodium nanoparticles embedded in porous glass have been studied by NMR. The measurements have been carried out on pulse spectrometers in magnetic fields of 9.4 and 17.6 T in a wide temperature range. Changes in the magnitude and temperature dependence of the 23 Na Knight shift with respect to those in bulk sodium have…
The paper presents a combination of theoretical suggestions, results, and observations allowing to improve the informativeness of hardness testing process in solving problems of metal product assessment while in operation. The hardness value of metal surface obtained by a single measurement is considered to be random.…