자료유형
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- THE KOREAN JOURNAL OF ORTHODONTICS(5)
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- BRAIN, DIGITAL, & LEARNING(1)
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- 대한기계학회론문집. TRANSACTIONS OF THE KOREAN SOCIETY OF MECHANICAL ENGINEERS. A. A(1)
- 대한기계학회론문집. TRANSACTIONS OF THE KOREAN SOCIETY OF MECHANICAL ENGINEERS. B. B(1)
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- 전자공학회논문지. JOURNAL OF THE KOREAN INSTITUTE OF TELEMATICS AND ELECTRONICS S. S(1)
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- 한국화재소방학회 논문지= JOURNAL OF KOREAN INSTITUTE OF FIRE SCIENCE & ENGINEERING(1)
전체 선택해제
총 106건 검색
본문검색 결과만 보기
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Multiple Quantum Coherence and Magic Angle in Solid NMR Spectroscopy
Shin. Yong-Jin, Kim. Nam-Su, Ryang. Kyung-Seung, Cho. Gyung-Goo, Jeong. Gwang-Woo 한국자기공명학회 Journal of the Korean magnetic resonance society 13 Pages
한국자기공명학회 Journal of the Korean magnetic resonance society 1999, Vol.3 No.2 127-139 (13 pages)
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Measurement of Refractive Index of Solid Medium by Critical Angle Method When Air Gap is Present
Lim. Hwan-Hong, Kwon. Moon-Soo, Choi. Hee-Joo, Kim. Byoung-Joo, Cha. Myoung-Sik 한국광학회 Journal of the Optical Society of Korea 5 Pages
한국광학회 Journal of the Optical Society of Korea 2008, Vol.12 No.3 210-214 (5 pages)
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엑시며 레이저에 의해 형성된 다결정 실리콘 박막의 Angle wrapping에 의한 깊이에 따른 특성변화
이창우, 고석중, Lee. Chang-U, Go. Seok-Jung 한국재료학회 한국재료학회지 6 Pages
한국재료학회 한국재료학회지 1998, Vol.8 No.10 884-889 (6 pages)
나타났다. 따라서 두께에 따라 결정화되는 상태의 변화를 조사하기 위하여 angle wrapping 방법을 새롭게 도입하여 깊이에 따른 Si층이 5${mu}m$ 이상되도록 angle wrapping한 후에 박막의 두께에 따른 micro-raman spectra를 측정하여 결정화상태에 따른 잔류응력을 조사하였다. 또한 기판의 온도가 상온인 경우에 엑시머 레이저의 밀도가 300mJ/${cm}^2$에서 열처리한 경우에 재결정화된 Si 박막의 잔류응력에 박막의 표면에서 박막의 깊이에 따라 $1.3{ imes}10^10$에서 $1.6{ imes}10^10$을 거쳐 $1.9{ imes}10^10$ dyne/${cm}^2$으로... -
Properties of Glass-Ceramics in the System CaO-TiO2-SiO2 with the Additives of Al2O3, ZrO2 and B2O3 for Use in the Solid Oxide Fuel Cells.
Lee. Jun-Suk, Park. Min-Jin, Shin. Hyun-Ick, Lee. Jae-Chun 한국세라믹학회 The Korean journal of ceramics 5 Pages
한국세라믹학회 The Korean journal of ceramics 1999, Vol.5 No.4 336-340 (5 pages)
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A study on the contact angles of a water droplet on smooth and rough solid surfaces
Park. Ju-Young, Ha. Man-Yeong, Choi. Ho-Jin, Hong. Seung-Do, Yoon. Hyun-Sik 대한기계학회 Journal of mechanical science and technology 10 Pages
대한기계학회 Journal of mechanical science and technology 2011, Vol.25 No.2 323-332 (10 pages)
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Dynamic Structure of Bacteriorhodopsin Revealed by $^{13}C$ Solid-state NMR
Saito. Hazime, Yamaguchi. Satoru, Tuzi. Satoru 한국광과학회 Journal of photoscience: an international journal officail organ of the Korean Society of Photoscien 4 Pages
한국광과학회 Journal of photoscience: an international journal officail organ of the Korean Society of Photoscien 2002, Vol.9 No.2 110-113 (4 pages)
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Effects of Self-stretching with Mobilization on Hip Range of Motion in Individuals with Hip Internal Rotation Deficits
Dong-Kyu Lee, In-Joon Uh 한국임상움직임치료학회 한국임상움직임치료학회지 9 Pages
한국임상움직임치료학회 한국임상움직임치료학회지 2021, 제 1권 제 1호 6 45-53 (9 pages)
Background : Both stretching and joint mobilization are effective for hip internal range of motion (ROM) recovery. In particular, stretching of the hip external rotators and posterior/lateral glide mobilization are used to improve hip internal rotation (IR) ROM. However, no study has examined the effects of simultaneous stretching and joint mobilization. Objectives : The purpose of this study was to investigate the effects of stretching with mobilization (SWM) on hip IR ROM and flexion abduction... -
Prevalence, toxin gene profile, antibiotic resistance, and molecular characterization of Clostridium perfringens from diarrheic and non-diarrheic dogs in Korea
Jung-Whan Chon, Kun-Ho Seo, Dongryeoul Bae, Ji-Hee Park, Saeed Khan, Kidon Sung 대한수의학회 Journal of Veterinary Science 7 Pages
대한수의학회 Journal of Veterinary Science 2018, 제 19권 제 3호 6 368-374 (7 pages)
Clostridium perfringens causes diarrhea and other diseases in animals and humans. We investigated the prevalence, toxin gene profiles, and antibiotic resistance of C. perfringens isolated from diarrheic dogs (DD) and non-diarrheic dogs (ND) in two animal hospitals in Seoul, Korea. Fecal samples were collected from clinically DD (n = 49) and ND (n = 34). C. perfringens was isolated from 31 of 49 DD (63.3%) and 21 of 34 ND dogs (61.8%). All C. perfringens strains were positive for the ... -
Laparoscopic left hepatectomy in swine: a safe and feasible technique
Hua Zhang, Tao Liu, Yue Wang, Hai-feng Liu, Jian-tao Zhang, Yan-shuang Wu, Lei Lei, Hong-bin Wang* 대한수의학회 Journal of Veterinary Science 6 Pages
대한수의학회 Journal of Veterinary Science 2014, 제 15권 제 3호 10 417-422 (6 pages)
A purely laparoscopic four-port approach was created for left hepatectomy in pigs. A polyethylene loop was placed on the left two hepatic lobes for traction and lift. Next, penetrating ligation of the lobes using of a double row of silk sutures was performed to control bleeding. A direct hepatic transection was completed using a monopolar hook electrode without meticulous dissection of the left hepatic vein. The raw surface of the liver was coagulated and sealed with fibrin glue. Lobes were... -
Evaluation of the Perkins handheld applanation tonometer in horses and cattle
Silvia Franco Andrade, Daniel Silva Kupper, Luiz Fernando Rodrigues de Pinho, Elizabeth Cunha Franco, Marcus Vin?cius Felix Fabr 대한수의학회 Journal of Veterinary Science 6 Pages
대한수의학회 Journal of Veterinary Science 2011, 제 12권 제 2호 10 171-176 (6 pages)
The objective of this study was to evaluate and validate the accuracy of the Perkins handheld applanation tonometer for measuring intraocular pressure (IOP) in horses and cattle. Both eyes of 10 adult horses and cattle were evaluated in a postmortem study. The eyes from 10 clinically normal adult horses and cattle were also examined after bilateral auriculopalpebral nerve block and topical anesthesia for an in vivo study. IOP was measured postmortem using direct manometry (measured with an... -
Spectral Doppler ultrasound in the major arteries of normal conscious immature micropigs
Joohyun Jung, Jinhwa Chang, Sunkyoung Oh, Mincheol Choi 대한수의학회 Journal of Veterinary Science 5 Pages
대한수의학회 Journal of Veterinary Science 2010, 제 11권 제 2호 10 155-159 (5 pages)
Spectral waveform analysis of blood flow velocity in the major arteries of six healthy, conscious immature micropigs was determined using Doppler ultrasonography. Doppler spectral tracings were recorded from the external iliac artery, femoral artery, and renal arcuate artery. Tracings were also taken from three parts of the common carotid artery and two parts of the abdominal aorta. Spectral Doppler parameters included peak systolic velocity, early diastolic velocity, peak systolic... -
Ultrasonographic evaluation of renal dimension and resistive index in clinically healthy Korean domestic short-hair cats
In-Chul Park, Hye-Sun Lee, Jong-Taek Kim, So-Jeong Nam, Ran Choi, Ki-Seok Oh, Chang-Ho Son, Changbaig Hyun* 대한수의학회 Journal of Veterinary Science 6 Pages
대한수의학회 Journal of Veterinary Science 2008, 제 9권 제 4호 12 415-420 (6 pages)
Renal length, height, width, resistive index (RI), size of cortex, and medulla were determined by renal ultrasonography in 50 healthy Korean domestic short-hair cats. In the sagittal plane, the renal length was 3.83 ± 0.51 cm (mean ± SD) in the left kidney and 3.96 ± 0.48 cm in the right kidney, whereas the renal height was 2.42 ± 0.27 cm in the left kidney and 2.36 ± 0.28 cm in the right kidney. In the transverse plane, the renal height was 2.42 ± 0.28 cm in the... -
Effects of continuous force application for extrusive tipping movement on periapical root resorption in the rat mandibular first molar
Yoshiro Matsumoto, Siripen Sringkarnboriboon, Takashi Ono 대한치과교정학회 The Korean Journal of Orthodontics 7 Pages
대한치과교정학회 The Korean Journal of Orthodontics 2018, 제 48권 제 5호 8 339-345 (7 pages)
Objective: The purpose of this study was to clarify the effects of continuous force application for extrusive tipping movement and occlusal interference on periapical root resorption in the rat mandibular first molar. Methods: We constructed an appliance comprising a titanium screw implant with a cobalt– chromium post as the anchorage unit and a nickel–titanium closed coil spring (50 cN) as the active unit. Force was applied on the mandibular left first molar of rats for 8 (n = 10)... -
상악골 전방 견인이 상악골체의 변위에 미치는 영향
고정석(Jeong-Seok Ko), 김종철(Jong-Chul Kim) 대한치과교정학회 The Korean Journal of Orthodontics 13 Pages
대한치과교정학회 The Korean Journal of Orthodontics 1995, 제 25권 제 5호 3 543-555 (13 pages)
골격근 부정교합에 대한 악정형 치료시, 바람직한 악정형 효과를 얻기 위해서는 악정형 장치의 역학 현상에 대한 분석이 필요하다. 상악의 저성장에 기인한 골격성 III급 부정교합의 치료를 위한 상악골의 전방견인시 바람직한 견인력 방향과 견인 위치를 알아보기 위해, 성인 두개골을 대상으로 3차원 유한 요소 모델을 제작하여, 제1소구치와 제1대구치에서 각각 교합평면에 평행 또는 20° 하방으로 500g의 전방 견인력을 주어 상악골체의 각 부분에서 응력과 변위를 분석하여 다음과 같은 결과를 얻었다. 1. 모든 경우 상악골이... -
상악 4절치의 후방견인시 나타나는 현상에 관한 유한요소법적 분석
천옥진(Ok-Jin Cheon), 김태우(Tae-Woo Kim), 서정훈(Cheong-Hoon Suhr) 대한치과교정학회 The Korean Journal of Orthodontics 17 Pages
대한치과교정학회 The Korean Journal of Orthodontics 1995, 제 25권 제 5호 2 525-541 (17 pages)
상악치열에서 제 1 소구치를 발거하고, 이 위치로 견치를 후방이동시킨 상태에서 retraction archwire를 사용하여 상악 4절치를 한 묶음으로 후방견인시켰을 때 초기에 나타나는 모든 힘 체계와 개개치아의 이동양상을 살펴보고 바람직하지 않은 치아이동을 감소시키기 위한 방안을 모색하고자 본 연구를 시행하였다. 먼저 유한요소법을 이용하여 상악 치아와 치근막의 해부학적 형태 및 생체적 특성을 컴퓨터로 재현시키고 모형화된 브라켓을 부착시킨 후, beam요소를 사용하여 5종의 retraction loop를 하나씩 부여한 다섯 가지의... -
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.... -
TiN Ion-Plating이 교정용 브라켓의 접착강도에 미치는 영향
김석용(Seok-Yong KIM), 권오원(Oh-Won KWON), 김교환(Kyo-Han KIM) 대한치과교정학회 The Korean Journal of Orthodontics 15 Pages
대한치과교정학회 The Korean Journal of Orthodontics 1997, 제 27권 제 1호 13 157-171 (15 pages)
TiN ion-plating이 교정용 브라켓의 접착강도에 미치는 영향을 알아보기 위하여 세 종류의 서로 다른 기저면형태를 가지는 스테인레스 스틸제의 브라켓을 선택하고, TiN ion-plating 된 브라켓과 ion-plating 되지 않은 브라켓을 치아에 접착시켰을 때 초기 및 장기 접착강도, 접착계면의 주사전자현미경 관찰, 파단면의 주사전자 현미경과 관찰을 비교 분석하여 다음과 같은 결론을 얻었다. • TiN ion-plating을 하지 않은 경우 24시간 후의 접착강도는 Micro-Loc 형이 5.89±1.77 MPa, Foil Mesh 4.27±1.12 MPa,... -
‘좌우대칭 자’를 활용한 5학년 학생들의 점대칭도형의 의미 이해
김순영, 이광호 한국교원대학교 뇌기반교육연구소 Brain, Digital, & Learning 18 Pages
한국교원대학교 뇌기반교육연구소 Brain, Digital, & Learning 2019, 제 9권 제 3호 12 253-270 (18 pages)
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Responses of Inferior Olive Neurons to Stimulation of Semicircular Canals
Sah-HoonPark, JongSeongPark, MinSuLee, JungWooShin 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 6 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2002, Vol.6 No.4 4 193-198 (6 pages)
In spite of abundant anatomical evidences for the fiber connection between vestibular nuclei and inferior olivary (IO) complex, the transmission of vestibular information through the vestibulo- olivo-cerebellar climbing fiber pathway has not been physiologically established. The aims of the present study were to investigate whether there are IO neurons specifically responding to horizontal rotation and also in which subregions of IO complex these vestibularly-activated neurons are located. The... -
Validation of the Munich ChronoType Questionnaire in Korean Older Adults
Hyera Ryu, Eun Yeon Joo, Su Jung Choi, Sooyeon Suh 대한신경정신의학회 Psychiatry Investigation 8 Pages
대한신경정신의학회 Psychiatry Investigation 2018, 제 15권 제 8호 5 775-782 (8 pages)
Objective_This study aimed to evaluate psychometric properties of the Munich ChronoType Questionnaire (MCTQ) in a sample of Korean older adults. Methods_One-hundred ninety two participants aged 65 and over completed interview-based questionnaires about chronotype, insomnia, depression, and anxiety. Additionally, a small subset of subjects completed a 7-day sleep diary and actigraphy measurements. Results_Morningness-Eveningness Questionnaire (MEQ) scores were significantly negatively correlated... -
精神科 入院患者의 自殺에 對한 몇 가지 臨床的 考察
李相換, 趙斗英 대한신경정신의학회 신경정신의학 7 Pages
대한신경정신의학회 신경정신의학 1981, 제 20권 제 1호 4 36-42 (7 pages)
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사람 적혈구막의 (Na＋+K+)-ATPase/Na+, K+ Pump의 Target Size
하종식(Hah, Jong-Sik), Jung, Chan Y. 대한생리학회 대한생리학회지 10 Pages
대한생리학회 대한생리학회지 1985, 제 19권 제 1호 2 15-24 (10 pages)
(Na++K+)-ATPase은 α 와 β의 두 subunits로 구성되어 있으며, 분자량이 약 300,000 daltons 정도되는 것으로 보아 α2β2의 형태로 존재할 것으로 알려져 왔다 한편, 사람 적혈구막에 있는 Na+, K+ Pump는 glycolytic enzymes과 complex를 이루고 있으리라는 보고도 있다. 우리는 이 실험에서 in situ상태의 사람 적혈구막(Na++K+)-ATPase의 분자량을 측정하기 위하여, 소위 말하는 ‘Target theory’를 radiation에 의한 ouabain sensitive한 Na+이동과, intact한 cells과 ghosts에서의 ATP가수분해능력의 inactivation data에... -
임프란트 상부 구조물의 상호 호환성에 관한 연구
최희수 대한치과이식임플란트학회 Journal of Dental Implant Research 10 Pages
대한치과이식임플란트학회 Journal of Dental Implant Research 2008, 제 27권 2호 7 53-62 (10 pages)
치과계의 blue ocean 으로 임프란트가 각광을 받으면 서 현재 대한민국은 전 세계 임프란트 시장의 각축장 이 되고 있다. Br°anemark의 osseointegration 개념을 바탕으로 한 다양한 형태의 나사형 임프란트가 시장 을 주도하고 있으며 현재 미국에서만 80여종, 한국에 서도 50여종의 임프란트가 사용되고 있다.(Table 1)1) 전 세계적으로는 약 350 여종의 제품이 치과 임 프란트 시장을 형성하고 있는 것으로 알려져 있다. -
상악동에 인접하여 식립된 짧은 임프란트에 경사력이 작용하는 경우에 대한 유한요소해석적 연구
유원재, 이규복 대한치과이식임플란트학회 Journal of Dental Implant Research 13 Pages
대한치과이식임플란트학회 Journal of Dental Implant Research 2004, 제 23권 1호 3 19-31 (13 pages)
임프란트 시술의 장기적인 성공을 위해서는 임프란 트에 의해 주위골에 유도되는 응력의 수준을 가급적 낮출 필요가 있다.1) 골응력은 임프란트와 골조직간에 일어나는 하중전달의 결과이므로, 그 하중전달경로를 구성하는 임프란트의 재질2), 크기와 형상3,4), 임프란 트/골 계면의 특성 및 하중의 유형과 골의 상태5)등 여 러 인자들이 응력 분포에 영향을 미친다. -
효율적인 SOLAR CAR 파워 시스템을 위한 병렬구조의 최대전력 추적기 설계 및 해석
심재민, 김일송 인문사회과학기술융합학회 예술인문사회융합멀티미디어논문지 8 Pages
인문사회과학기술융합학회 예술인문사회융합멀티미디어논문지 2016, 제 6권 제 10호 57 585-592 (8 pages)
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예비교사를 위한 생물 읽기자료 개발
김경호 공주교육대학교 초등교육연구원 교육논총 23 Pages
공주교육대학교 초등교육연구원 교육논총 2019, 56권 1호 2 16-38 (23 pages)
초등학교 과학 교과서 내용 가운데 포함되는 과학 읽기 자료의 중요성은 여러 연구에서 강조하고 있다. 특히 과학사를 읽기 자료에 편집하는 것이 학생들의 과학 학습에 긍정적인 영향을 준다는 연구가 많이 있다. 본 연구에서는 공주교육대학교 학생들이 선택하여 읽고 인증을 받는 교양 도서 가운데 과학사와 관련된 도서를 보다 효과적으로 학생들에게 읽을 수 있도록 안내하는 방안을 구안하였다. 선택한 도서의 저자가 과학사나 과학을 전공하지 않은 일반 저술가인 점이 고등학교에서 자연계열을 이수하지 않은 공주교육대학교... -
단일 버너 석탄 연소로에서 합성가스 재연소에 관한 연구
한국열환경공학회 열환경공학 2020, 제 15권 1호 5 47-55 (9 pages)
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PCBs함유 폐기물 처리를 위한 플라즈마 용융기술
박현서, 송현선, 박동화, 유병수 한국열환경공학회 열환경공학 17 Pages
한국열환경공학회 열환경공학 2011, 제 8권 1호 7 51-67 (17 pages)
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Graphitization of PAN-based carbon fibers by CO₂ laser irradiation
Liangbo Yao, Weimin Yang, Sanyang Li, Yang Sha, Jing Tan, Ying An, Haoyi Li 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 13 97-102 (6 pages)
Graphite fibers are materials with a high specific modulus that have attracted much interest in the aerospace industry, but their high manufacturing cost and low yield are still problems that prevent their wide applications in practice. This paper presents a laser-based process for graphitization of carbon fiber (CF) and explores the effect of laser radiation on the microstructure of CF. The obtained Raman spectra indicate that the outer surface of CF evolves from turbostratic structures into a... -
Study on properties of eco-friendly reduction agents for the reduced graphene oxide method
Young-il Na, Young Il Song, Sun Woo Kim, Su-Jeong Suh 한국탄소학회 Carbon Letters 9 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 1 1-9 (9 pages)
We studied the basic properties and fabrication of reduced graphene oxide (rGO) prepared using eco-friendly reduction agents in the graphene solution process. Hydrazine is generally used to reduce graphene oxide (GO), which results in polluting emissions as well as fixed nitrogen functional groups on different defects in the graphene sheets. To replace hydrazine, we developed eco-friendly reduction agents with similar or better reducing properties, and selected of them for further analysis. In... -
Dispersions of partially reduced graphene oxide in various organic solvents and polymers
Hye Min Kim, Seo Gyun Kim, Heon Sang Lee 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2017, Vol.23 8 55-62 (8 pages)
We report on the dispersion state of partially reduced graphene oxide (PRGO) in organic solvents, namely methyl ethyl ketone, ethyl acetate, methylene chloride, toluene, and xylene, by controlling the carbon to oxygen (C/O) atomic ratio of the PRGOs. A two-phase solvent exchange method is also proposed to transfer PRGO from water to an aprotic solvent, such as methyl ethyl ketone. We achieve relatively good dispersion in aprotic and non-polar solvents by controlling the C/O atomic ratio of the... -
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)
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... -
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)
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... -
Nitrogen-doped carbon nanosheets from polyurethane foams and removal of Cr(VI)
Jiaqi Duan, Baohua Zhang, Huailin Fan, Wenzhong Shen, Shijie Qu 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 7 60-69 (10 pages)
hydrothermal carbonization following ZnCl2 chemical activation. Scanning electron microscopy, thermogravimetric analysis, Fourier transform infrared spectroscopy, solid state 13C nuclear magnetic resonance (NMR) spectra and X-ray photoelectron spectroscopy were used to characterize the nitrogen-doped carbon nanosheet structure and composition. The removal of Cr(VI) by the N-doped carbon nanosheets was investigated. The results showed that the maximum removal capacity for chromium of 188 mg/g was... -
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... -
A simple method to determine the surface energy of graphite
Jinseo Lee, Bumjae Lee 한국탄소학회 Carbon Letters 4 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 15 107-110 (4 pages)
Graphite is a material condensed from aromatic hydrocarbon that forms an infinite plane that exhibits an amphoteric feature. Structurally, a number of benzene rings form a solid planar sheet. A number of layers are formed from numerous unit cells, a so-called grapheme. A graphene sheet has an electron structure, which expands π-electrons into a two dimensional space. Graphite has AB-stacked bilayers of graphene. Because the interaction between two sheets is weak, their electronic structure may... -
Study of complex electrodeposited thin film with multi-layer graphene-coated metal nanoparticles
Young-Lae Cho, Jung-woo Lee, Chan Park, Young-il Song, Su-Jeong Suh 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 8 68-73 (6 pages)
We have demonstrated the production of thin films containing multilayer graphene-coated copper nanoparticles (MGCNs) by a commercial electrodeposition method. The MGCNs were produced by electrical wire explosion, an easily applied technique for creating hybrid metal nanoparticles. The nanoparticles had average diameters of 10?120 nm and quasispherical morphologies. We made a complex-electrodeposited copper thin film (CETF) with a thickness of 4.8 μm by adding 300 ppm MGCNs to the electrolyte... -
Effect of carbonization temperature on crystalline structure and properties of isotropic pitch-based carbon fiber
Jung Dam Kim, Jae-Seung Roh, Myung-Soo Kim 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 6 51-60 (10 pages)
Isotropic pitch-based fibers produced from coal tar pitch with the melt-blowing method were carbonized at temperatures ranging from 800 to 1600oC to investigate their crystalline structure and physical properties as a function of the carbonization temperature. The in-plane crystallite size (La) of the carbonized pitch fiber from X-ray diffraction increased monotonously by increasing the carbonization temperature resulting in a gradual increase in the electrical conductivity from 169 to 3800... -
Synthesize multi-walled carbon nanotubes via catalytic chemical vapour deposition method on Fe-Ni bimetallic catalyst supported on kaolin
Aliyu A, Abdulkareem AS, Kovo AS, Abubakre OK, Tijani JO, Kariim I 한국탄소학회 Carbon Letters 18 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 5 33-50 (18 pages)
In this study, Fe-Ni bimetallic catalyst supported on kaolin is prepared by a wet impregnation method. The effects of mass of kaolin support, pre-calcination time, pre-calcination temperature and stirring speed on catalyst yields are examined. Then, the optimal supported Fe-Ni catalyst is utilised to produce multi-walled carbon nanotubes (MWCNTs) using catalytic chemical vapour deposition (CCVD) method. The catalysts and MWCNTs prepared using the optimal conditions are characterized using high... -
Mechanical properties of epoxy composites reinforced with ammonia-treated graphene oxides
Mi-Seon Park, Sangmin Lee, Young-Seak Lee 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 1 1-7 (7 pages)
The effects of ammonia-treated graphene oxide (GO) on composites based on epoxy resin were investigated. Ammonia solutions of different concentrations (14?28%) were used to modify GO. Nitrogen functional groups were introduced on the GO surfaces without significant structural changes. The ammonia-treated GO-based epoxy composites exhibited interesting changes in their mechanical properties related to the presence of nitrogen functional groups, particularly amine (C-NH2) groups on the GO... -
Adsorption capability of activated carbon synthesized from coconut shell
Md Shariful Islam, Bee Chin Ang, Samira Gharehkhani, Amalina Binti, Muhammad Afifi 한국탄소학회 Carbon Letters 9 Pages
한국탄소학회 Carbon Letters 2016, Vol.20 1 1-9 (9 pages)
Activated carbon was synthesized from coconut shells. The Brunauer, Emmett and Teller surface area of the synthesized activated carbon was found to be 1640 m2/g with a pore volume of 1.032 cm3/g. The average pore diameter of the activated carbon was found to be 2.52 nm. By applying the size-strain plot method to the X-ray diffraction data, the crystallite size and the crystal strain was determined to be 42.46 nm and 0.000489897, respectively, which indicate a perfect crystallite structure. The... -
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)
in the melt spinning of molten mesophase 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 th... -
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)
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... -
Carbon rich fly ash and their nanostructures
Numan Salah, Sami S. Habib, Zishan H. Khan, Ahmed Alshahrie, Adnan Memic, Attieh A. Al-ghamdi 한국탄소학회 Carbon Letters 9 Pages
한국탄소학회 Carbon Letters 2016, Vol.19 3 23-31 (9 pages)
Carbon rich fly ash was recently reported to have compositions that are ideal for use as a precursor and catalyst for carbon nanotube growth. This fly ash powder is mostly composed of pure carbon, predominantly present as sp2. In this work, the effect of sonication time on the morphology and structural properties of carbon rich fly ash particles is reported. The obtained results show that ultrasound treatment is an effective tool for producing ultrafine particles/fragments with higher porosity,...
