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Effects of electrochemical oxidation of carbon fibers on interfacial shear strength using a micro-bond method
Dong-Kyu Kim, Kay-Hyeok An, Yun Hyuk Bang, Lee-Ku Kwac, Sang-Yub Oh, Byung-Joo Kim 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2016, Vol.19 4 32-39 (8 pages)
II, ULVAC-PHI; Chigasaki, Japan). The single-fber contact angle was measured using a Kruss K-100SF (Kruss GmbH Ltd., Hamburg, Germany) with 1 μg weight resolution. A tensile test of the fber was carried out on a Favigraph semiautomatic device (Textechno Company, Monchengladbach, Germany). The gauge length of the fber was 20 mm and the draw-off clamp speed was set at 1 mm/min. A micro-bond... before and after electrochemical-oxidation-treatment were characterized using field emission scanning electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and single-fiber contact angle. The mechanical interfacial shear strength of the CFs/epoxy matrix composites was investigated by using a micro-bond method. From the results, electrochemical oxidation treatment introduced oxygen functional groups and increased roughness on the... -
Studies on Nanostructures Amorphous Carbon by X-ray Diffraction and Small Angle X-ray Scattering
K.Dasgupta, P.S.R.Krishna, R.Chitra, D.Sathiyamoorthy 한국탄소학회 Carbon Letters 4 Pages
한국탄소학회 Carbon Letters 2003, Vol.4 No.1 2 10-13 (4 pages)
of RDF vs r correspond to the frequently occurring atom-atom distances and the area under the peak is equal to the average number of atom pairs within the partic- ular range of distances [4]. The interference function [5] I(Q) is given by (1) where Q=4π (sinθ)/λ, 2θ is the scattering angle, λ is the I Q( ) I coh a Q( ) i n ∑xifi 2 Q( ) xifi Q( ) i n ∑ 2 = Carbon Science ..PAGE:2 Studies on... -
Injury and inflammation detection by the application of microcurrent through the skin
Timothy Hui-Jerrold Petrofsky 물리치료재활과학회 Physical Therapy Rehabilitation Science 8 Pages
물리치료재활과학회 Physical Therapy Rehabilitation Science 2013, 제 2권 제 1호 6 31-38 (8 pages)
average of 17% after 5 minutes (p<0.05), remained decreased for 30 seconds, and returned to non-occlusive levels after 2 minutes of normal circulation. The results indicate that the microcurrent decrease was not due to blood flow, and most likely from hypoxic cellular damage. For the re- liability phase, the coefficients of variation averaged 10.3% for the shoulder, 14.8% for the low back, and... and distance between the electrodes. Finally, measurements over sprained ankle were compared to measurements over comparable uninjured areas on the same injured subject. Results: For the blood flow test phase, microcurrent significantly decreased an average of 17% after 5 minutes (p<0.05), remained decreased for 30 seconds, and returned to non-occlusive levels after 2 minutes of normal circulation. The results indicate that the microcurrent decrease was not due to blood flow, and most likely fro... -
인접 자연치를 침범한 임플란트와 침범받은 자연치의 임상적 예후
구정귀, 윤필영, 최용훈, 이양진, 안교진, 이희진, 김영균 대한치과이식임플란트학회 Journal of Dental Implant Research 10 Pages
대한치과이식임플란트학회 Journal of Dental Implant Research 2015, 제 34권 1호 3 12-21 (10 pages)
of two implants failed and removed, and the average survival rate was 94.9%. As for the state of invaded natural teeth, 27 teeth (69.2%) functioned in a sound and vital state. Three invaded teeth (7.7%) were extracted and nine teeth (23.1%) functioned without problems after receiving root canal treatment. Conclusions: Within the limitation of and short-term evaluation, invasion of implant to... 임플란트는 치조골, 인접치 및 대합치의 상태에 따라 식립 위치가 결정된다. 치조골의 상태에 따라 식립각도에 제한이 있는 경우가 있 으며, 주변 인접치의 해부학적 배열 상태에 따라 임플란트 식립 위치 및 각도를 고려해야 한다1). -
Evaluation of Pathogenic Variability Based on Leaf Blotch Disease Development Components of Bipolaris sorokiniana in Triticum aestivum and Agroclimatic Origin
한국식물병리학회 The Plant Pathology Journal 11 Pages
한국식물병리학회 The Plant Pathology Journal 2018, 34권 2호 2 93-103 (11 pages)
of South Asian countries. The average yield loss due to leaf blotch in South Asia and India has been estimated to be 19.6% and 15.5%, respectively and Yield losses reached up to 80% to 100% under most severe con- ditions of infection (Joshi and Chand, 2002). Rice-wheat *Corresponding author. Phone) 08801922264339, FAX) +88-041-731244 E-mail) hure_jannat888@yahoo.com This is an Open Access... Leaf blotch of wheat caused by Bipolaris sorokiniana is a major constraint to wheat production, causing significant yield reduction resulting in severe economic impact. The present study characterizes to determine and compare pathogenic variability exist/not based on components of leaf blotch disease development and level of aggressiveness due to agroclimatic condition of B. sorokiniana in wheat. A total of 169 virulent isolates of B. sorokiniana isolated from spot blotch infected leaf from... -
Mechanical and electrical properties of cement paste incorporated with pitch-based carbon fiber
Inkyu Rhee, Jin Hee Kim, Sang Hee Park, Sungho Lee, Bong Ryeul Ryu, Yoong Ahm Kim 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2017, Vol.23 4 22-29 (8 pages)
m 2/g. The average diameter of the silica fume particles was 0.15 μm. The ultra- fne particles of silicon dioxide as a by-product were grabbed in the manufacturing process of silicon metal and ferro-silicon. The mixing process was performed using a standard Hobart-like mixer (Kenwood mixer, Japan), as specifed in ASTM C 305- 14. All dried materials, including the cement and silica fume, were... The compressive strength and electrical resistance of pitch-based carbon fiber (CF) in cementitious materials are explored to determine the feasibility of its use as a functional material in construction. The most widely used CFs are manufactured from polyacrylonitrile (PAN-based CF). Alternatively, short CFs are obtained in an economical way using pitch as a precursor in a melt-blown process (pitch-based CF), which is cheaper and more eco-friendly method because this pitch-based CF is basically... -
Fabrication of nitrogen doped ordered mesoporous carbon derived from glucosamine with hybrid capacitive behaviors
Deyi Zhang, Mei Han, Yubing Li, Bing Wang, Yi Wang, Kunjie Wang, Huixia Feng 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2017, Vol.23 2 9-16 (8 pages)
a higher angle, implying ap- parent framework shrinkage during the carbonization process. As shown in Table 1, the cell parameter (a) of the fabricated NOMC materials was calculated to be 9.39 nm, which was low- er than that of the SBA-15 template (10.97 nm). The ordered mesoporous structure of the fabricated NOMC materials was further confrmed by scanning electron micro- scope (Fig. 4a and b)... This paper introduces a nitrogen-doped ordered mesoporous carbon (NOMC) derived from glucosamine with hybrid capacitive behaviors, achieved by successfully combining electrical double-layer capacitance with pseudo-capacitance behaviors. The nitrogen doping content of the fabricated NOMC reached 7.4 at% while its specific surface area (SBET) and total pore volume reached 778 m2 g?1 and 1.17 cm3 g?1, respectively. A dual mesoporous structure with small mesopores centered at 3.6 nm and large... -
Hole quality assessment of drilled CFRP and CFRP-Ti stacks holes using polycrystalline diamond (PCD) tools
Dave Kim, Aaron Beal, Kiweon Kang, Sang-Young Kim 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2017, Vol.23 1 1-8 (8 pages)
an optical micro- scope with a digital measuring device. Fig. 5. Effect of tool wear and drilling (a) high and (b) low speed on hole pro les. CFRP, carbon ber reinforced plastic. Fig. 6. E ect of tool wear and speed on hole surface roughness parameters, Ra and Ry. Error bars indicate the standard deviation. (a) Average hole sur- face Ra every 20 holes, (b) average hole surface Ry every 20 holes.... drilled for the next 20 holes with the same drill bit. CFRP holes and CFRP-Ti stack holes were evaluated in terms of machined hole quality. The main tool wear mechanism of PCD drills is micro-fractures that occur when machining the Ti plate of the stack. Tool wear increases the instability and the operation temperature when machining the Ti plate. This results in high drilling forces, large hole diameter errors, high surface roughness, wider CFRP exit thermal damage, and taller exit Ti burrs. -
High-energy-density activated carbon electrode for organic electric-double-layer-capacitor using carbonized petroleum pitch
Poo Reum Choi, Sang-Gil Kim, Ji Chul Jung, Myung-Soo Kim 한국탄소학회 Carbon Letters 11 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 8 70-80 (11 pages)
of solvent shells around the electrolyte ions; thus, the average distance between the pore wall and the center of the ions was reduced. The surface normalized specifc capacitances (μF/cm 2) are also shown in Table 1. These values increased continuously with the increase of the pre-carbonization temperature and rose dra- matically in the temperature range of 8001000°C. The SSAs and pore... Activated carbons (ACs) have been used as electrode materials of electric double-layer capacitors (EDLC) due to their high specific surface areas (SSA), stability, and ecological advantages. In order to make high-energy-density ACs for EDLC, petroleum pitch (PP) precarbonized at 500?1000°C in N2 gas for 1 h was used as the electrode material of the EDLC after KOH activation. As the pre-carbonization temperature increased, the SSA, pore volume and gravimetric capacitance tended to decrease, but... -
Bulk graphite: materials and manufacturing process
Sang-Min Lee, Dong-Su Kang and Jea-Seung Roh 한국탄소학회 Carbon Letters 12 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.3 1 135-146 (12 pages)
to thousands, with the average falling between 300-1000 [50]. Pitch as binder offers the advantages of low softening point, low melt viscosity, high carbon yield, and ease of graphitiza- tion. During heat treatment, pitch attains low viscosity through the emission of oxidized functional groups, sulfur, and nitrogen. At around 400°C-450°C, pitch forms anisotropic liquid crystals, and this is... Graphite can be classified into natural graphite from mines and artificial graphite. Due to its outstanding properties such as light weight, thermal resistance, electrical conductivity, thermal conductivity, chemical stability, and high-temperature strength, artificial graphite is used across various industries in powder form and bulk form. Artificial graphite of powder form is usually used as anode materials for secondary cells, while artificial graphite of bulk form is used in steelmaking...