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Characterization of TiO2 quantum dots synthesized by hydrothermal method
심영재,최경진 한국전기전자재료학회 2016 Transactions on Electrical and Electronic Material Vol.17 No.2
TiO2 quantum dots were synthesized by a hydrothermal method after precipitating titanium hydroxide using Ti(SO4)2 and NaOH solutions. A simple hydrothermal apparatus was manufactured in the laboratory and operated at temperature 100℃, 130℃, and 160℃. Spherical, uniform, and non-aggregated approximately 15 nm in size TiO2 quantum dots were obtained. Properties of synthesized TiO2 quantum dots were characterized using UV/Vis/NIR spectrophotometry, XRD diffractometry, and TEM.
심영재,최경진 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.9
Nano-size BaTiO3 powder was synthesized by relatively simple hydrothermal reaction method. Finely dispersed Ti hydroxide precursor was first precipitated using Ti(SO4)2 and NaOH solution by applying ultrasonic power and washed thoroughly to remove SO4 2- and Na+ ion. Then hydrothermal reaction was done at 160℃ for 6 hrs using solution prepared by washed Ti hydroxide precursor slurry and Ba(OH)2ㆍ8H2O with Ti:Ba mole ratio of 1:1. 200 ~ 500 nm size and uniform size distributed BaTiO3 powder was synthesized by relatively low temperature and simple process. 비교적 간단한 수열합성법에 의해 나노 크기의 BaTiO3 분말을 합성하였다. Ti(SO4)2와 NaOH 용액에 초음파를 가하여 아주 적은 크기의 Ti 수산화물 전구체 슬러리를 먼저 침전 한 후 SO42-와 Na+ 이온을 완전히 제거하기 위하여 세척을 하였다. 그리고 세척된 Ti 수산화물 전구체 슬러리에 Ti:Ba 를 1:1비로 Ba(OH)2•8H2O를 첨가한 후 160℃에서 6시간 동안 수열합성하여 200 ~ 500 nm 크기의 비교적 균질한 분포의 BaTiO3 분말을 비교적 낮은 온도와 간단한 공정으로 제조하였다.
The Briot-Bouquet differential subordination associated with vertical strip domains
심영재,권오상 호남수학회 2017 호남수학학술지 Vol.39 No.4
For real parameters $\alpha$ and $\beta$ such that $\alpha < 1 < \beta$, we denote by ${\cal P}(\alpha,\beta)$ the class of analytic functions $p$, which satisfy $p(0)=1$ and $\alpha < \re \left\{ p(z) \right\} < \beta$ in $\mathbb{D}$, where $\mathbb{D}$ denotes the open unit disk. Let ${\cal A}$ be the class of analytic functions in $\mathbb{D}$ such that $f(0)=0=f'(0)-1$. For $f \in {\cal A}$, $\mu \in \mathbb{C}\setminus \{ 0 \}$ and $\nu \in \mathbb{C}$, let $I_{\mu,\nu}:{\cal A} \rightarrow {\cal A}$ be an integral operator defined by \begin{equation*} I_{\mu,\nu}[f](z) = \1( \frac{\mu+\nu}{z^{\nu}} \int_{0}^{z} f^{\mu}(t) t^{\nu-1} {\rm d}t \2)^{1/\mu}. \end{equation*} In this paper, we find some sufficient conditions on functions to be in the class ${\cal P}(\alpha,\beta)$. One of these results is applied to the integral operator $I_{\mu,\nu}$ of two classes of starlike functions which are related to the class ${\cal P}(\alpha,\beta)$.
SOME RESULTS ON ANALYTIC FUNCTIONS ASSOCIATED WITH VERTICAL STRIP DOMAIN
심영재,권오상 장전수학회 2016 Proceedings of the Jangjeon mathematical society Vol.19 No.4
For real parameters α and β such that α < 1 < β, we denote by Ρ(α, β) the class of analytic functions p, which satisfy p(0) = 1 and the following two-sided inequality: α < R{p(z)} < β (z ∈ D), where D denotes the open unit disk. We denote by S*(α, β), K(α, β), M(α, β) and N(α, β) the classes of normalized analytic functions f, which satisfy that each function zf'(z)/f(z), 1 + (zf"(z)=f'(z)), f'(z) and f(z)/z belongs to the class P(α, β), respectively. In this paper, we βnd some sufficient conditions on functions to be in the class P(α, β). Applying these results, we βnd some inclusion relationships related to the above classes.
Cathode materials of Li ion battery
심영재,문성인,형유업,도칠훈,윤문수 국립경상대학교 공과대학 부설 첨단소재연구소 1994 尖端素材 Vol.4 No.-
Li ion 2차전지는 높은 전지전압, 낮은 자기방전율, High Energy Density High Power Density Non-Toxic, No Memory Effect등의 우수한 특성을 보유하고 있고, 환경적인 측면에서 Lead Acid 전지 및 Ni/Cd 전지 등과 같은 Pb, Cd 및 Hg 등으로 인한 환경오염문제가 없는 고성능 신형전지로써, 92년에 SONY사에서 최초의 시제품을 내놓은 이래 현재 소형녹음기, 캠코더 및 셀룰라폰용으로 시판되고 있으나 세계적으로 Li ion 전지를 생산할 수 있는 회사는 일본의 몇몇 기업으로 한정되어 있는 실정이다.
황산암모늄의 첨가가 산청 백색 카올린으로부터 알루미나의 용출에 미치는 영향
심영재,황규홍,배원태 慶尙大學校 工科大學 附屬 生産技術硏究所 1985 生産技術硏究所論文集 Vol.1 No.-
It were studied the effects of ammonium sulfate as additive, calcination temperature and amount of sulfuric acid for extraction of alumina from Sancheong white kaolin by wet acid process. DTA and XRD indicated that mixtures were decomposed completely at 550℃. Optimum condition for extraction of alumina were as follows. 1. 0.2-0.3 mole of ammonium sulfate to 1 mole of Al₂O₃in kaolin was suitable. 2. calcination temperature was 550℃. 3. 1%, 100cc of H₂SO₄was adaptable to l gr of kaolin. 4. Both α-and γ-Al₂O₃were obtainable. 5. Low-iron kaolin was adaptable to reduce contamination of Alumina from iron.
안충선,심영재,조병두 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.2
Nonlinear exponents and electron trap density variations were observered in ZnO-Bi2O3-MnO2 ternary ZnO varistors as a function of heat treatment temperature. Three kinds of ZnO varistor compositions were selected; i.e. 99.0 ZnO-0.5 Bi2O3-0.5 MnO2, 98.5 ZnO-1.0 Bi2O3-0.5 MnO2, and 98.0 ZnO-1.5 Bi2O3-0.5 MnO2 in mol%. Sintering was done at 1150$^{\circ}C$ for three hours, and heat treatments were done at 500$^{\circ}C$, 700$^{\circ}C$, and 900$^{\circ}C$. When heat treated at 500$^{\circ}C$, nonlinear exponents were increased regardless of the Bi2O3 amount. Increasing heat treatment temperature above 500$^{\circ}C$ resulted in lowering nonlinear exponents. Nonlinear exponents seem to be related to the 0.17 and 0.33 eV electron traps which are possibly of intrinsic origin.