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水熱合成에 의한 Pb(Mn Sb)Ti Zr O₃세라믹의 粉末合成
李明敎 釜山工業大學校 1985 論文集 Vol.27 No.-
Prepration of powder on Pb(Mn??Sb??)??Ti??Zr??O?? Ceramics by Hydrothermal Synthesis Method have been investigated. Observing for X-ray diffraction, powders prepared by Hydrothermal Synthesis were produced when reaction temperature was above 160℃. Sintering density and dielectric constant of sample increased with Hydrothermal Reaction Temperature while decreased rapidly above 240℃.
水熱合成에 의한 Pb(Mn_(⅓)Sb_(⅔))_(0.08)Ti_(0.495)Zr_(0.425)O₃계의 제조와 그 유전특성
洪昌熹,李明敎 동아대학교 공과대학 부설 한국자원개발연구소 1986 硏究報告 Vol.10 No.1
Formation of power and dielectric characteristics of the system Pb(Mn_(⅓) Sb_(⅔) _(0.08)Ti_(0.495) Zr_(0.425)O₃ by hydrothermal synthesis method are descrided. This ceramics by hydrothermal synthesis were formed above 160℃, reaction temperature. The grain size of powders were increased with the rising of hydrothermal reaction temperature and holding time. Sintering density and dielectric constant of sample was maximum nearby 220℃~240℃, reaction temperature.
PVDF와 PZT 混合材料의 電氣機械結合係數에 관한 硏究
趙廷台,李明敎 釜山工業大學校 1995 論文集 Vol.37 No.-
It has been known piezoelectric activity can be generated in synthetic polymer films subjected to a strong DC electric field at elevated temperatures. Polyvinylidene fluoride(PVDF) is best known and commercially most attractive which has been utilized as an active element in many applications ranging from infrared detector to ultrasonic transducers. Lead Zirconate-Lead Titanate(PZT) powders are made from the mole ratio of Pb(Mn1/3Sb2/3)0.08Ti0.49Zr0.425O3 by mixing PbCl2, ZrOCl2, TiCl4, MnCl2 and SbCl3. PVKF-PZT powders are mixed with aceton liquid and make of disc type in diameter 20mm, thickness 0.3mm by the pressure of 20dg/㎠. Poling is done by appling a strong electric field 20kV/cm. Dielectric constant of composite by the mixture ratio is about 30-50 and the value of electro-mechanical coupling factor k is 0.48.
DMA 가스 검지를 위한 ZnO 박막의 aging 효과
김성우,최혁환,이명교,권태하 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
The DMA(Dimethylamine) gas sensors were fabricated with the ZnO-based thin films grown by a RF magnetron sputtering method. The characteristics of the sensors to aging conditions were investicated. The sensors with ZnO-based thin films aged for 72hrs at a temperature of 330 ℃ in oxygen showed high sensitivity, low working temperature and good linearity. The sensors with ZnO-based thin film doped with 0.1 wt.% Pt catalytics and aged for 72hrs at a temperature of 330 ℃ in oxygen showed the maximum sensitivity of 90 at a working temperature of 150 ℃ and to DMA gas of 160 ppm. The sensor was electrically stablized.
RF 마그네트론 스퍼터링 방법을 이용한 ZnO 가스센서의 암모니아 검지특성
최우창,최혁환,이명교,권태하 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
The ammonia gas sensors were fabricated with the ZnO-based thin films grown by a RF magnetron sputtering method in various sputtering gas atmosphere and substrate temperature. We investigated the sensitivity to ammonia gas concentration and working temperature. The sensors of thin films grown in oxygen sputtering gas showed higher sensitivity than those grown in argon sputtering gas. The sensors with ZnO-based thin film doped with MoO_(3)(0.875 wt.%) showed the maximum sensitivity of 70 at a working temperature of 250 ℃ and to ammonia gas of 160 ppm.
김성우,최우창,류지열,박성현,최혁환,이명교,권태하 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
The DMA(Dimethylamine) gas sensors were fabricated with the ZnO-based thin films grown by a RF magnetron sputtering method. We investigated the sensitivity and response time according to temperature variation and DMA gas concentration. The ZnO-based thin film sensors sputtered in oxygen atmosphere showed higher sensitivity than those sputtered in argon atmosphere. The ZnO-based thin film sensors doped with Al_(2)O_(3), In_(2)O_(3) and V_(2)O_(5) and sputtered in oxygen atmosphere showed the maximum sensitivity of 218(working temperature, 250 ℃, DMA gas, 160 ppm) and speedy response time. The ZnO-based thin film sensors doped with Al_(2)O_(3), In_(2)O_(3), TiO_(2) and V_(2)O_(5), sputtered in oxygen atmosphere and aged at 330 ℃ showed the maximum sensitivity of 156(working temperature, 250 ℃, DMA gas, 160 ppm).
박성현,최우창,김성우,류지열,최혁환,이명교,권태하 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
The microheaters with Si_(3)N_(4)(1500Å)/SiO_(2)(3000Å)/Si_(3)N_(4)( 1500Å) diaphragm were fabricated by thin film technology and silicon micromachining techniques. Pt and poly-Si(n+) materials were used as heater materials of microheater. Pt temperature sensor was fabricated to detect the temperature of microheaters. The thermal analysis including temperature distribution on diaphragm and power consumption of the microheater were executed by the FEM method and heat transfer equations. The power consumption of the Pt and poly-Si(n+) heaters were measured and compared to that of thermal analysis by FEM simulation.
최우창,김성우,류지열,박성현,최혁환,이명교,권태하 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
The ammonia gas sensors were fabricated with the ZnO-based thin films grown by a RF magnetron sputtering method. We investigated the sensitivity and response time according to temperature variation and ammonia gas concentration. The sensors sputtered in oxygen atmosphere showed higher sensitivity than those sputtered in argon atmosphere. The Au(0.3 wt.%) doped-ZnO thin film sensors aged at 330 ℃ showed the maximum sensitivity of 28 and good response time at a working temperature of 250 ℃ and to 160 ppm ammonia gas. The Pt(0.1 wt.%) doped-ZnO thin film sensors showed the maximum sensitivity at a low working temperature of 200 ℃.
Mathematical Models of Competitive Adsorption of Inorganic Anions in Soils
Lee, Kyo Suk,Lee, Dong Sung,Lee, Jae Bong,Joo, Rhee Na,Lee, Myong Yun,Chung, Doug Young Korean Society of Soil Science and Fertilizer 2015 한국토양비료학회지 Vol.48 No.6
Competition among anion species in solution for same sorption sites and soil surface can be of major significance in determining the effective mobility of any potentially adsorbing species. Major soil anion species include $OH^-$, $F^-$, $Cl^-$, $HCO_3{^-}$, $CO_3{^-}$, $NO_3{^-}$, $SO_4{^{2-}}$, and $PO_4{^{3-}}$. And some micro nutrients such as boron and molybdenum exist as $H_2BO_3{^-}$ and $MoO_4{^{2-}}$, as do some heavy metals such as chrome and arsenic as $CrO_4{^{2-}}$ and $HAsO_4{^{2-}}$. Pesticides such as 2,4,5-T and 2,4-D also exist as anions. Many anion species are retained by more complex mechanisms than the simple electrostatic attractions involved in most cation adsorption reactions. In binary system composed of two anions, the adsorption of one anion is influenced by the other anion due to the competition for the available and limited binding sites in soil constituents. The specifically adsorbed anions may compete more effectively for sorption sites than that of nonspecifically adsorbed anion. In this study, we aim to evaluate the mathematical models to determine the magnitude of concentration variations in adsorption due to competitive interactions between anions introduced to a system in binary mixtures.
Mathematical Models of Competitive Adsorption of Inorganic Anions in Soils
Kyo Suk Lee,Dong Sung Lee,Jae Bong Lee,Rhee Na Joo,Myong Yun Lee,Doug Young Chung 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.6
Competition among anion species in solution for same sorption sites and soil surface can be of major significance in determining the effective mobility of any potentially adsorbing species. Major soil anion species include OH<SUP>-</SUP>, F<SUP>-</SUP>, Cl<SUP>-</SUP>, HCO₃<SUP>-</SUP>, CO₃<SUP>-</SUP>, NO₃<SUP>-</SUP>, SO₄<SUP>2-</SUP>, and PO₄<SUP>3-</SUP>. And some micro nutrients such as boron and molybdenum exist as H₂BO₃- and MoO₄<SUP>2-</SUP>, as do some heavy metals such as chrome and arsenic as CrO₄<SUP>2-</SUP> and HAsO₄<SUP>2-</SUP>. Pesticides such as 2,4,5-T and 2,4-D also exist as anions. Many anion species are retained by more complex mechanisms than the simple electrostatic attractions involved in most cation adsorption reactions. In binary system composed of two anions, the adsorption of one anion is influenced by the other anion due to the competition for the available and limited binding sites in soil constituents. The specifically adsorbed anions may compete more effectively for sorption sites than that of nonspecifically adsorbed anion. In this study, we aim to evaluate the mathematical models to determine the magnitude of concentration variations in adsorption due to competitive interactions between anions introduced to a system in binary mixtures.