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전체 선택해제
총 201건 검색
본문검색 결과만 보기
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A Proposal of an Elastic Modulus Equation for High-Strength and Ultra High-Strength Concrete
Jang. II-Young, Park. Hoon-Kyu, Yoon. Young-Soo 한국콘크리트학회 International journal of concrete structures and materials 6 Pages
한국콘크리트학회 International journal of concrete structures and materials 2006, Vol.18 43-48 (6 pages)
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Nanotribology를 이용한 PMMA 박막의 Hardness와 Elastic Modulus 특성 연구
김수인, 김현우, 노성철, 윤덕진, 장홍준, 이종림, 이창우, Kim. Soo-In, Kim. Hyun-Woo, Noh. Seong-Cheol, Yoon. Duk-Jin, Chang. Hong-Jun, Lee. Jong-Rim, Lee. Chang-Wo 한국진공학회 韓國眞空學會誌 5 Pages
한국진공학회 韓國眞空學會誌 2009, Vol.18 No.5 372-376 (5 pages)
또한 리소그래피에 의하여 생성된 패턴은 이후 세정 공정에서 잔류물을 제거하는 과정에서 패턴 붕괴를 일으키게 되는데 이러한 패턴 붕괴에 대한 방어력은 패턴 형성 물질의 탄성력(Elastic modulus)과 비례하는 것으로 알려져 있다. 이 논문에서 우리는 PMMA의 soft-baking 이후 Hardness(H)와 Elastic modulus(Er)의 변화를 압입력을 25 uN에서 8,500 uN으로 134.52 uN 간격으로 증가시키며 측정하였다. 또한 이 실험에서 Hardness(H)와 Elastic modulus(Er)는 Hysitron사의 Triboindenter를 이용하여 측정하였고 압입팁은 Berkovich... -
Response of temperature dependence of an elastic modulus in microstretch generalized thermoelasticity
Kumar. Rajneesh, Gupta. Rajani Rani 테크노프레스 Structural engineering and mechanics : An international journal 16 Pages
테크노프레스 Structural engineering and mechanics : An international journal 2008, Vol.30 No.5 577-592 (16 pages)
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The influence of combining composite resins with different elastic modulus on the stress distribution of class V restoration: A three-dimensional finite element study
박정길, 허복, 김성교, Park. Jeong-Kil, Hur. Bock, Kim. Sung-Kyo 대한치과보존학회 大韓齒科保存學會誌 14 Pages
대한치과보존학회 大韓齒科保存學會誌 2008, Vol.33 No.3 184-197 (14 pages)
본 연구는 3차원 유한요소분석법적 연구를 통해 쐐기형 비우식성 치경부병소의 복합레진수복에서 다른 탄성계수를 가진 복합레진의 혼합수복이 5급 수복물의 응력분포에 미치는 영향에 대해 알아보고자 하였다. 발거된 상악 제2소구치를 Micro-CT로 스캔한 후 3D-DOCTOR로 3차원유한요소 모형을 제작하였다. 제작된 소구치 모형에 쐐기형 와동과 변형시킨 와동을 형성하고 각 와동을 탄성계수가 서로 다른 혼합형 복합레진 또는 흐름성 복합레진으로 수복하였다. 수복 전, 후 협측교두와 설측교두에 500N의 하중을 가한 후 응력분포를... -
Comparison of the elastic modulus among three dentin adhesives before and after thermocycling
장주혜, 이인복, 조병훈, 김혜영, 손호현, Chang. Ju-Hea, Lee. In-Bog, Cho. Byeong-Hoon, Kim. Hae-Young, Son. Ho-Hyun 대한치과보존학회 大韓齒科保存學會誌 9 Pages
대한치과보존학회 大韓齒科保存學會誌 2008, Vol.33 No.1 45-53 (9 pages)
본 연구는 현재 시판되고 있는 여러 개의 상아질 접착제를 임상 술식에서와 같은 방법으로 사용한 후 열 시효처리를 통해 노화 과정을 재현한 다음 접착 계면의 탄성계수를 측정함으로써 가수분해에 따른 물성변화를 관찰 비교하고자 했다. 발거 한 지 2 주일 이내인 영구 대구치 21 개의 상아질 표면이 노출되도록 삭제하였다. 각각 7개의 치아에 시판되고 있는 3가지 상아질 접착제 (OptiBond FL, Clearfil SE, Xeno III)를 적용한 뒤 광중합 복합 레진(Premisa, Kerr, Orange, CA, USA) 를 1 mm 두께로 쌓아 올렸다. 각 치아를... -
Ultrasound Attenuation in the Assessment of Bone Mineral Density and Elastic Modulus of Human Trabecular Bone
Han. S.M., Kim. M.S. 대한의용생체공학회 의공학회지 6 Pages
대한의용생체공학회 의공학회지 1998, Vol.19 No.2 171-176 (6 pages)
본 연구에서는 뼈의 특성을 파악하는 초음파감쇠 파라미터를 재평가하였다. 초음파 속도, 특정 주파수(0.5MHz)에서의 초음파감쇠 및 광역 밴드 초음파감쇠와 같은 초음파 파라미터들을 해면골 입방체 시편의 세 직교방향(전/후, 내/외, 상/하)에서 측정하였다. 그리고 컴퓨터 영상장치를 사용하여 골밀도를 측정했으며, 골 시편의 무게와 부피를 이용하여 외형밀도도 함께얻었다. 이와같이 구해진 외형밀도와 초음파 속도로부터 초음파 탄성영률을 계산하였다. 주파수 0.5MHz에서의 초음파감쇠와 광역밴드감쇠는 골밀도 및 세 직교방향의... -
Formulation of elastic modulus of concrete using linear genetic programming
Gandomi. Amir Hossein, Alavi. Amir Hossein, Sahab. Mohammad Ghasem, Arjmandi. Parvin 대한기계학회 Journal of mechanical science and technology 6 Pages
대한기계학회 Journal of mechanical science and technology 2010, Vol.24 No.6 1273-1278 (6 pages)
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Contact analysis of spherical ball and a deformable flat model with the effect of tangent modulus
Sathish Gandhi. V.C., Ramesh. S., Kumaravelan. R., Thanmanaselvi. M. 테크노프레스 Structural engineering and mechanics : An international journal 12 Pages
테크노프레스 Structural engineering and mechanics : An international journal 2012, Vol.44 No.1 61-72 (12 pages)
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Effective buckling length of steel column members based on elastic/inelastic system buckling analyses
Kyung. Yong-Soo, Kim. Nam-Il, Kim. Ho-Kyung, Kim. Moon-Young 테크노프레스 Structural engineering and mechanics : An international journal 22 Pages
테크노프레스 Structural engineering and mechanics : An international journal 2007, Vol.26 No.6 651-672 (22 pages)
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Reliability and validity of a personal computer based muscle viewer for measuring upper trapezius and transverses abdominis muscle thickness
Ju-Ri Jeong, Ju Hee Han, Ji-Eun Cho, Wan-hee Lee 물리치료재활과학회 Physical Therapy Rehabilitation Science 7 Pages
물리치료재활과학회 Physical Therapy Rehabilitation Science 2016, 제 5권 제 3호 8 155-161 (7 pages)
Objective: This study aimed to investigate the reliability and validity of a personal computer-based muscle viewer (PC-BMW) compared with that of a portable ultrasound (P-US) for measuring upper trapezius (UT) and transversus abdominis (TrA) muscle thickness at rest and during contraction. Design: Observational inter-rater reliability study. Methods: Fifty-five healthy participants (25 men, 30 women) participated in this study. PC-BMW and P-US were randomly measured at the UT and TrA muscles.... -
지반공학적 연구를 통한 함안 성산산성의 부엽공법 조사
김진만(Jinman Kim), 이희범(Heebeom Lee), 양숙자(Sukja Yang) 한국고고학회 한국고고학보 22 Pages
한국고고학회 한국고고학보 2012, 제 83집 4 130-151 (22 pages)
한국의 함안에 위치한 성산산성은 삼국시대의 석축산성으로서 축성과정에서 부엽공법을 사용해 학계로부터 크게 주목을 받고 있는 유적이다. 본 연구는 함안 성산산성과 같은 유적의 형성과 활용, 그리고 폐기에 대한 연구를 통해 고고학과 공학 기술이 결합된 유적 해석의 새로운 연구 모델을 제시하고 현대 토목공학기술의 원형을 추적하여 공학기술에 역사적 정체성을 부여하기 위해 수행되었다. 융합연구의 수행 과정에는 연구 대상 유적인 함안성산산성 현장 답사, 관련 문헌 연구, 지반공학적 실험, 그리고 컴퓨터를 이용한 모델링... -
Effects of thermoforming on the physical and mechanical properties of thermoplastic materials for transparent orthodontic aligners
Jeong-Hyun Ryu, Jae-Sung Kwon, Heng Bo Jiang, Jung-Yul Cha, Kwang-Mahn Kim 대한치과교정학회 The Korean Journal of Orthodontics 10 Pages
대한치과교정학회 The Korean Journal of Orthodontics 2018, 제 48권 제 5호 5 316-325 (10 pages)
A+ increased. The flexure modulus for the 0.5-mm-thick Duran, Essix A+, and eCligner specimens increased, whereas that for the 0.75-/1.0-mm-thick Duran and eClginer specimens decreased. In addition, the elastic modulus increased for the 0.5-mm-thick Essix A+ specimens and decreased for the 0.75-mm-thick Duran and Essix ACE and the 1.0-mm-thick Essix ACE specimens. Conclusions: Our findings suggest that the physical and mechanical properties of thermoplastic materials used for the fabrication of... -
Displacement and stress distribution of the maxillofacial complex during maxillary protraction using palatal plates
Jusuk Eom, Mohamed Bayome, Jae Hyun Park, Hee Jin Lim, Yoon-Ah Kook, Seong Ho Han 대한치과교정학회 The Korean Journal of Orthodontics 12 Pages
대한치과교정학회 The Korean Journal of Orthodontics 2018, 제 48권 제 5호 4 304-315 (12 pages)
Objective: The purpose of this study was to analyze initial displacement and stress distribution of the maxillofacial complex during dentoskeletal maxillary protraction with various appliance designs placed on the palatal region by using three-dimensional finite element analysis. Methods: Six models of maxillary protraction were developed: conventional facemask (Type A), facemask with dentoskeletal hybrid anchorage (Type B), facemask with a palatal plate (Type C), intraoral traction using a... -
The effects of posterior retraction on the displacement of the maxilla
Bo-Yeong Yoo, Jong-Chul Kim 대한치과교정학회 The Korean Journal of Orthodontics 13 Pages
대한치과교정학회 The Korean Journal of Orthodontics 1996, 제 26권 제 6호 5 691-703 (13 pages)
Three-dimensional finite element model was made from adult skull to find desirable direction of retraction force to treat skeletal class II malocclusion. The retraction force of 400g was applied to the first molar. The direction of the force application was 23° downward, parallel, 23° upward and 45` upward to the occlusal plane. The stress distribution and the displacement within the maxilla were analyzed by three-dimensional finite element method. The findings obtained were as follows: 1.... -
Continuous straight archwire에 의하여 발생하는 force system의 분석
최광철(Kwang-Chul Choy), 손병화(Byung Hwa Sohn) 대한치과교정학회 The Korean Journal of Orthodontics 10 Pages
대한치과교정학회 The Korean Journal of Orthodontics 1996, 제 26권 제 3호 6 281-290 (10 pages)
Edgewise bracket에 continuous straight archwire를 장착 했을 때 각 bracket에 발생하는 force system은 statically indeterminate system이기 때문에 임상적으로 측정이 어렵다. 이에 본 연구는 linear beam theory를 도입하여 full arch에 straight wire가 장착된 경우 geometry(a/b), 재질, 단면의 모양, interbracket distance에 관계없이 발생 가능한 모든 상태를 설명할 수 있는 식을 유도하고 일례의 분석을 통하여 다음과 같은 결과를 얻었다. 1. Bilateral fixed beam의 양끝에서 발생하는 force system을 알 수 있는 계산식을... -
CONTINUOUS ARCHWIRE의 FORCE SYSTEM에 대한 3차원 유한 요소법적 연구
노 준(Joon Row), 유영규(Young-Kyu Ryu) 대한치과교정학회 The Korean Journal of Orthodontics 16 Pages
대한치과교정학회 The Korean Journal of Orthodontics 1996, 제 26권 제 1호 2 17-32 (16 pages)
3 dimensional elastic beam이 continuous arch의 형태와 유사한 점에 착안하여 continuous arch의 force system을 분석하고자 하였으며, 이를 위해 다양한 형상을 갖는 3개의 bracket geometry를 표본형상으로 설정하고 기울기, 변위 및 interbracket distance에 따른 힘과 moment의 변화양상을 분석하고, 저자가 임의로 제작한 불규칙한 치아배열을 갖는 3차원 모형을 일례로하여 0.016NiTi archwire를 bracket내에 삽입했을 때 발생되는 초기 힘과 moment를 분석 비교해본 결과 다음과 같은 결론을 얻었다. 1. Bracket의 변위 또는... -
급속 구개 확장 장치 종류가 상악골 주변 봉합에 미치는 영향에 대한 유한요소해석
김유완, 문윤식, 성상진 대한구순구개열학회 대한구순구개열학회지 10 Pages
대한구순구개열학회 대한구순구개열학회지 2012, 제 15권 2호 1 51-60 (10 pages)
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Low Intensity Resistance Exercise Training with Blood Flow Restriction: Insight into Cardiovascular Function, and Skeletal Muscle Hypertrophy in Humans
Song-YoungPark, YiSubKwak, rewHarveson, JoshuaCWeavil, KookE.Seo 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2015, Vol.19 No.3 1 191-196 (6 pages)
Attenuated functional exercise capacity in elderly and diseased populations is a common problem, and stems primarily from physical inactivity. Decreased function and exercise capacity can be restored by maintaining muscular strength and mass, which are key factors in an independent and healthy life. Resistance exercise has been used to prevent muscle loss and improve muscular strength and mass. However, the intensities necessary for traditional resistance training to increase muscular strength... -
The Molecular Basis and Physiological Implications of Red Cell Deformability
Chien, Shu 대한생리학회 대한생리학회지 14 Pages
대한생리학회 대한생리학회지 1991, 제 25권 제 2호 1 101-114 (14 pages)
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가토(家兎) 외경동맥(外經動脈)의 신장도(伸張度)에 대(對)하여
이동일(Lee, Dong-Il), 주영은(Choo, Young-Eun) 대한생리학회 대한생리학회지 10 Pages
대한생리학회 대한생리학회지 1973, 제 7권 제 2호 8 49-58 (10 pages)
가토(家兎)의 외경동맥(外頸動脈)의 신장도(伸張度)를 알기 위(爲)하여 좌측(左側) 외경동맥(外經動脈)을 절단(切斷)하여 적출(摘出)하고 전혈질(全血質)과 횡절편(橫切片) 및 종절편(縱切片)을 작성(作成)한 후(後) 생리적식염수(生理的食鹽水) 중(中)에 둔 군(群)과 동일(同一)한 방법(方法)으로서 얻은 각(各) 혈질표본(血質標本)을 0.15 mM 및 0.30 mM의 ATP 용액중(溶液中)에 둔 군(群)에서 각각(各各) 15분(分), 45분(分) 및 75분(分)에서 길이 일장력곡선중(一張力曲線中) 탄성(彈性)의 한계(限界) 내(內)에서 Hooke의... -
고막(鼓膜)의 탄성도(彈性度)와 파열장력(破裂張力)에 관(關)한 연구(硏究)
이영식(Lee, Young-Shik) 대한생리학회 대한생리학회지 8 Pages
대한생리학회 대한생리학회지 1968, 제 2권 제 1호 6 39-46 (8 pages)
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부분 관통 구멍이 있는 인장판의 주응력 분포 차이 해석
박상현, 김영철, 김명수, 백태현 인문사회과학기술융합학회 예술인문사회융합멀티미디어논문지 8 Pages
인문사회과학기술융합학회 예술인문사회융합멀티미디어논문지 2017, 제 7권 제 2호 42 437-444 (8 pages)
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철근콘크리트 연결보 대체상세의 구조성능 검증에 대한 실험적 연구
김선웅, 박완신, 장영일, 윤현도, 엄남용, 김선우 인문사회과학기술융합학회 예술인문사회융합멀티미디어논문지 8 Pages
인문사회과학기술융합학회 예술인문사회융합멀티미디어논문지 2015, 제 5권 제 2호 22 199-206 (8 pages)
최근 들어 동북아 아시아 지역에 지진의 발생빈도가 급격하게 늘어나고 있는 상황이다. 지진 발생 시 수 많은 가옥의 붕괴, 사회기반 시설의 파괴는 물론 수많은 인명피해가 발생되고 있어 이에 따른 대책이 필요한 실정이다. 따라서 지진에 대해 효과적으로 거동하는 재료 및 구조시스템에 대한 연구 가 국내·외적으로 활발히 수행되고 있는 가운데 지진에 대해 효과적으로 거동하는 내진시스템 가운데 하나인 연결보에 대한 연구가 활발히 수행되고 있다.[1]. 그러나 이러한 연결보는 ACI 318-05 및 318-08 규준식에 의하면 폭이 좁은... -
Diagnosis and Characterization of Middle-ear and Cochlear Functions
Rong Z. Gan 한국청각언어재활학회 Audiology and Speech Research 18 Pages
한국청각언어재활학회 Audiology and Speech Research 2013, 제 9권 제 2호 1 95-112 (18 pages)
Hearing impairment is one of the most common physical disabilities in the world. Conductive hearing loss results from dysfunction of the middle ear, and sensorineural hearing loss results from abnormalities within the cochlea or central nervous system. To improve the diagnosis of hearing loss and develop new technologies for restoration of hearing, changes of the middle ear and cochlear functions in relation to ear structural disorders in hearing impaired ears need to be characterized. This... -
Effect of the surface modification using MWCNTs with different L/D by two different methods of deposition on the IFSS of single carbon fiber-epoxy resin composite
Minerva L. Herrera-Sosa, Alex Valadez-Gonz?lez, Humberto V?zquez-Torres, Pierre G. Mani-Gonz?lez, Pedro J. Herrera-Franco 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 3 18-27 (10 pages)
Multiwall carbon nanotubes (MWCNT) with two different (L/D) aspect ratios (7±2 μm/140±30 nm and 0.5?2 μm/8?15 nm) were surface treated using nitric acid (HNO3) and polyethyleneimine (PEI) prior to their deposition on carbon fibers (CF). Before the hierarchical reinforcement with CF-MWCNT, the CFs were treated with 3-glycidoxypropyltrimethoxysilane, a coupling agent (Z6040) and with poly(amidoamine) (PAMAM) a dendrimer containing an ethylenediamine core and amine surface groups. The MWCNT... -
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)
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 carbon fiber SMC composites with vinyl ester resin and effect of carbon fiber content on mechanical properties
Haksung Lee, Mongyoung Huh, Jaeyoung Yoon, Dasom Lee, Seonyul Kim, Shinjae Kang 한국탄소학회 Carbon Letters 4 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 11 101-104 (4 pages)
Fiber reinforced composites are being used in the automotive industry and other manufacturing fields. Their properties, including high specific stiffness, strength and weight reduction make fiber composite materials an attractive replacement for metal components. The development of composites like carbon fiber reinforced plastic and related production technologies have contributed to the increasing application of fiber composite materials. Many new components have recently been adapted,... -
Comparative numerical evaluation for the low velocity impact behavior of T300 and T800 composite system
Jae-Seok Choi, Heung Soap Choi, Soo-Jin Park, Myung Kyun Park 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 9 89-95 (7 pages)
Carbon fiber reinforced polymer (CFRP) composites have been used for many decades for extreme light weight design purposes in various areas, such as the aerospace industry, automobiles, sports goods and etc. because they provide the advantages of high specific strength and high rigidity [1]. In particular, the fuselage and wings of various aircraft, as well as the load bearing structures and components of mechanical and civil engineering systems are currently being manufactured with CFRP.... -
Synthesis and characterization of carbon doped TiO₂ photocatalysts supported on stainless steel mesh by sol-gel method
JO. Tijani, OO. Fatoba, TC. Totito, WD. Roos, LF. Petrik 한국탄소학회 Carbon Letters 12 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 6 48-59 (12 pages)
This study synthesized pure anatase carbon doped TiO₂ photocatalysts supported on a stainless steel mesh using a sol-gel solution of 8% polyacrylonitrile (PAN)/dimethylformamide (DMF)/TiCl₄. The influence of the pyrolysis temperature and holding time on the morphological characteristics, particle sizes and surface area of the prepared catalyst was investigated. The prepared catalysts were characterized by several analytical methods: high resolution scanning electron microscopy (HRSEM), energy... -
Graphene accelerates osteoblast attachment and biomineralization
Jia Ren, Xiaogang Zhang, Yao Chen 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 5 42-47 (6 pages)
exhibited vinculin expression throughout the cell body. The rougher and wrinkled surface morphology, higher elastic modulus and easy out-of-plane deformation associated with GF were considered to promote cell adhesion. Also, the biomineralization of GF was assessed by soaking in simulated body fluid, and the GF exhibited enhanced mineralization ability in terms of mineral deposition, which almost pervaded the entire GF surface. Our results suggest that graphene promotes cell adhesion, activity... -
Thermo-electrical properties of randomly oriented carbon/carbon composite
Thakur Sudesh Kumar Raunija, N. Supriya 한국탄소학회 Carbon Letters 11 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 3 25-35 (11 pages)
The aim of the work was to investigate the thermo-electrical properties of low cost and rapidly produced randomly oriented carbon/carbon (C/C) composite. The composite body was fabricated by combining the high-pressure hot-pressing (HP) method with the lowpressure impregnation thermosetting carbonization (ITC) method. After the ITC method step selected samples were graphitized at 3000°C. Detailed characterization of the samples’ physical properties and thermal properties, including thermal... -
The impact fracture behaviors of CFRP/EVA composites by drop-weight impact test
Sun-Ho Go, Hong-Gun Kim, Hee-Jae Shin, Min-Sang Lee, Hyun-Gyung Yoon, Lee-Ku Kwac 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 4 23-32 (10 pages)
A drop weight impact test was conducted in this study to analyze the mechanical and thermal properties caused by the changes in the ratio of carbon fiber reinforced plastic (CFRP) to ethylene vinyl acetate (EVA) laminations. The ratios of CFRP to EVA were changed from 10:0 (pure CFRP) to 9:1, 8:2, 6:4, and 5:5 by manufacturing five different types of samples, and at the same time, the mechanical/thermal properties were analyzed with thermo-graphic images. As the ratio of the CFRP lamination was... -
Thermoelectric Seebeck and Peltier effects of single walled carbon nanotube quantum dot nanodevice
H. A. El-Demsisy, M. D. Asham, D. S. Louis, A. H. Phillips 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 2 8-15 (8 pages)
The thermoelectric Seebeck and Peltier effects of a single walled carbon nanotube (SWCNT) quantum dot nanodevice are investigated, taking into consideration a certain value of applied tensile strain and induced ac-field with frequency in the terahertz (THz) range. This device is modeled as a SWCNT quantum dot connected to metallic leads. These two metallic leads operate as a source and a drain. In this three-terminal device, the conducting substance is the gate electrode. Another metallic gate... -
The effect of the spinning conditions on the structure of mesophase pitch-based carbon fibers by Taguchi method
Zhao Jiang, Ting Ouyang, Xiangdong Yao, Youqing Fei 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2016, Vol.19 11 89-98 (10 pages)
pitch to produce carbon fibers. The textures of the obtained carbon fibers were radial with varied crack angles, as observed by scanning electron microscopy and polarized optical imaging. The diameter, crack angle, preferred orientation, and tensile modulus of the produced samples were examined to investigate the influence of four spinning variables. The relative importance of the variables has been emphasized for each characteristic. The results show that thicker carbon fiber can be obtained wi... -
Effect of fiber-matrix adhesion on the fracture behavior of a carbon fiber reinforced thermoplastic-modified epoxy matrix
H.J. Carrillo-Escalante, A. ?lvarez-Castillo, A. Valadez-Gonz?lez, P. J. Herrera-Franco 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2016, Vol.19 6 47-56 (10 pages)
In this study, the fracture behavior of a thermoplastic-modified epoxy resin reinforced with continuous carbon fibers for two levels of fiber-matrix adhesion was performed. A carbon fiber with commercial sizing was used and also treated with a known silane, (3-glycidoxy propyl trimethoxysilane) coupling agent. Toughness was determined using the double cantilever test, together with surface analysis after failure using scanning electron microscope. The presence of polysulfone particles improved... -
Phenylethynyl-terminated polyimide, exfoliated graphite nanoplatelets, and the composites: an overview
Donghwan Cho, Lawrence T. Drzal 한국탄소학회 Carbon Letters 11 Pages
한국탄소학회 Carbon Letters 2016, Vol.19 1 1-11 (11 pages)
In efforts to characterize and understand the properties and processing of phenylethynyl-terminated imide (LaRC PETI-5, simply referred to as PETI-5) oligomers and polymers as a high-temperature sizing material for carbon fiber-reinforced polymer matrix composites, PETI-5 imidization and thermal curing behaviors have been extensively investigated based on the phenylethynyl end-group reaction. These studies are reviewed here. In addition, the use of PETI-5 to enhance interfacial adhesion between... -
Microstructural changes of polyacrylonitrile-based carbon fibers (T300 and T700) due to isothermal oxidation (1): focusing on morphological changes using scanning electron microscopy
Seong-Moon Oh, Sang-Min Lee, Dong-Su Kang, Jae-Seung Roh 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2016, Vol.18 3 18-23 (6 pages)
Polyacrylonitrile (PAN)-based carbon fibers have high specific strength, elastic modulus, thermal resistance, and thermal conductivity. Due to these properties, they have been increasingly widely used in various spheres including leisure, aviation, aerospace, military, and energy applications. However, if exposed to air at high temperatures, they are oxidized, thus weakening the properties of carbon fibers and carbon composite materials. As such, it is important to understand the oxidation... -
A review: role of interfacial adhesion between carbon blacks and elastomeric materials
Min-Joo Kang, Young-Jung Heo, Fan-Long Jin, Soo-Jin Park 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2016, Vol.18 1 1-10 (10 pages)
Carbon blacks (CBs) have been widely used as reinforcing materials in advanced rubber composites. The mechanical properties of CB-reinforced rubber composites are mostly controlled by the extent of interfacial adhesion between the CBs and the rubber. Surface treatments are generally performed on CBs to introduce chemical functional groups on its surface. In this study, we review the effects of various surface treatment methods for CBs. In addition, the preparation and properties of CB-reinforced... -
A review: synthesis and applications of graphene/chitosan nanocomposites
Hui Yuan, Long-Yue Meng, Soo-Jin Park 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2016, Vol.17 No.1 2 11-17 (7 pages)
Recently, with continuous developments in the field of materials science, graphene oxide (GO) has emerged as a promising material with excellent electrical, thermal, mechanical, and optical properties, which play important roles in most fields. Researchers have achieved considerable progress with graphene. Chitosan (CS) is a natural polymer that has been studied intensively owing to its specific formation, high chemical resistance, and excellent physical properties. These outstanding properties... -
Advances in liquid crystalline nano-carbon materials: preparation of nano-carbon based lyotropic liquid crystal and their fabrication of nano-carbon fibers with liquid crystalline spinning
Yong-Mun Choi, in Jung Jun Yeon, Hwang Seung Min, Kim Hyeonsu Jeong, Bon-Cheol Ku, Munju Goh 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.4 1 223-232 (10 pages)
This review presents current progress in the preparation methods of liquid crystalline nanocarbon materials and the liquid crystalline spinning method for producing nano-carbon fibers. In particular, we focus on the fabrication of liquid crystalline carbon nanotubes by spinning from superacids, and the continuous production of macroscopic fiber from liquid crystalline graphene oxide. -
Manufacturing and characteristics of PAN-based composite carbon fibers containing cellulose particles
Jee-Woo Yang, Da Young Jin, Ji Eun Lee, Seung Goo Lee, Won Ho Park 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.3 7 203-210 (8 pages)
such as the heat treatment temperature of the cellulose particles and the amount of cellulose added, the thermal and mechanical properties of the PANbased carbon fibers were investigated. The results show that it is possible to manufacture composite carbon fibers with low thermal conductivity. That is, thermal conductivities were reduced by the cellulose particles in the PAN based carbon fibers while at the same time, the tensile strength loss was minimized, and the tensile modulus increased. -
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)
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...
