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        • 전도도계의 제작에 관한 연구

          강용환,최석남,박병빈 공주대학교 사범대학 과학교육연구소 1980 과학교육연구 Vol.12 No.1

          A low-cost student type conductance meter have been developed for the measurement of conductivity of electrochemical system. This instrument measures an impedance range from ?? Ohm with 2% accuracy. And this instrument could be applied to measure the rapid chemical reaction.

        • Copper(II)-L-Serine Complex에 관한 Polarography

          박병빈,金容範,柳承泰 忠州大學校 1973 한국교통대학교 논문집 Vol.6 No.-

          A polarograpic study on the behavior of Cu(II)-L-Serine Complex system in alkaline nitrate medium was performed to observe the effect of ligand concentration and pH. The kinetic parameters of the irreversible reduction of the complex were evaluated. We can be up to the conclusion that at least two molecules of L-Serine and a hydroxyl ion [OH??] are participitated in the equilibrium of the complex in the electrode reactions as follows; ??

        • 원소와 주기율에 대한 Computer 학습 Program연구

          박병빈,김재현 공주대학교 사범대학 과학교육연구소 1983 과학교육연구 Vol.15 No.1

          Two kinds of microcomputer programs were constructed for the instruction of elements and periodic properties. the first program can display 14 kinds of data for 103 elements, and the second show dinamical chang of atomic radius, density, electronegativity and frist ionization potential as graph. These could be used for teaching materials in chemical education and as reference programs to develop the more advanced CAI programs.

        • 미분폴라로그래프의 제작

          박병빈,고영환 공주대학교 사범대학 과학교육연구소 1996 과학교육연구 Vol.27 No.1

          낱알 회로(digital circuit)와 빗댐 회로(analog circuit)를 혼용하여 저렴하고 간단한 미분 폴라로그래프를 제작하였다. 수은 방울 치개 및 신호 채취(signal sampling)계의 시각 배열(timing sequence) 회로에는 낱알 소자를, 정전압 전원, 비탈 발생 및 신호 채취계에는 빗댐 소자를 각각 이용하였다. 그리고 빗댐 회로의 스윗칭에는 광 트랜지스터를 사용하였다. A method has been developed for instrumenting differential polarography. Digital circuitry is used for the timing sequence, and analog elements for the potentiostat, ramp generation, and sampling. And photo-transistor swiches are used to turn analog devices on and off. It is simple and much less expensive than commercial equipment used in now-a-day. The result of experiment which illustrate the performance of the device are presented.

        • 교류폴라로그래프의 제작 : fundamental and second harmonic

          박병빈,최석남 공주대학교 사범대학 과학교육연구소 1988 과학교육연구 Vol.20 No.1

          An alternating current polargraph (fundamental and second harmonic) has been constructed using operational ampliers. This instrument is capable of phase sensitive detection and phase angle detection at the frequency of 70,140,280,560,1120Hz respectively. The AC and cyclic voltammogram of cd²+ show that this instrument could be applied to measure electrochemical onalysis and reaction.

        • KCI등재

          [화학] 위상각 측정에 의한 적정의 정확한 종말점 검출법에 관한 연구

          박병빈(Byung-Bin Park),신호상(Ho-Sang Shin),이한형(Han-Hyoung Lee) 한국분석과학회 1999 분석과학 Vol.12 No.4

          임피던스 위상각 적정법을 산화환원적정, 산염기적정, 착화적정 그리고 침전적정에 적용하여 정확한 종말점 검출법을 연구하였다. 일정한 교류전류가 두 백금전극사이를 통과하도록 하였고 그중 하나는 0.1 ㎠ 또는 0.026 ㎠의 표면적을 가진 초소형 분극전극이었고 다른 하나는 1 ㎠의 표면적을 비분극전극을 사용하였다. 과망간산칼륨에 의한 옥살산의 산화환원적정에서 임피던스 위상각 적정법을 적용하였을때 50 ㎂, 0.0005 M 이상의 농도에서 뚜렷한 종말점을 얻었고, 50 ㎐ 근방의 주파수 영역에서 가장 확실한 종말점을 얻을 수 있었다. NaOH에 의한 인산의 산염기 적정에서 0.001 M 수산화나트륨에 의한 0.001 M 인산의 적정시 임피던스 위상각 적정법을 적용하여 50 ㎂, 주파수 25-97 ㎐의 넓은 주파수 영역에서 뚜렷한 제1당량점을 얻었다. 이는 전도도의 반대 개념으로서의 임피던스의 변화량이 종말점을 기점으로 변곡하고 이에따라 위상각이 변화하는데 원인됨을 알았다. 또한 제2당량점에서는 임피던스 위상각 적정법으로 뚜렷한 종말점을 얻지 못하였다. 이는 Na₂HPO₄의 가수분해를 막기 위하여 적정시 과량으로 첨가되는 NaCl에 의한 방해로 생각된다. 0.1 M EDTA에 의한 0.01 M 황산구리의 착화적정시에는 위상각 측정으로 적정종말점을 찾기 보다는 “다른위상” 임피던스 Z"을 측정하여 종말점을 알아내는 것이 유리함을 알았다. AgNO₃에 의한 Cl-의 침전적정에 있어 100 ㎂, 0.1 M 농도에서 임피던스 위상각 적정법을 적용하여 명확한 종말점을 얻었고, 15-30㎐ 범위에서 가장 안정적인 뚜렷한 변화를 볼 수 있었다. 그러나 0.01 M 농도에서는 임피던스 위상각의 뚜렷한 변화를 볼 수 없었다. 본 연구에서 임피던스 위상각 적정법을 산화환원적정, 산염기적정, 착화적정 그리고 침전적정시의 종말점 검출을 위해 사용하였을 때 대부분 성공적이었으며 이는 적정시 종말점을 정확히 측정하는 목적에 활용 할수 있음을 보여주는 것이다. A study on the application of impedance phase angle for redox titration, acid-base titration, chelate titration and precipitation titration has been carried out. A constant alternating current was passed between two platinum electrodes. One of them was a polarizable micro-electrode of 0.1 ㎠ or 0.026 ㎠ surface area and the other a non-polarizable large electrode of 1 ㎠ surface area dipped in the solution to be titrated. The impedance and the phase angle of the titration cell were measured with lock-in amplifier to obtain well behaved titration curve respectively. In titration of oxalic acid vs. potassium permanganate, the end-point was obtained successfully from the phase angle titration curve. In this experiment, the concentration of 0.0005 M to 0.05 M, the current of 50 ㎂ and the frequency of near 50 ㎐ were used. In titration of phosphoric acid vs. sodium hydroxide, the first end-point was obtained successfully on the optimum experimental condition of 0.001 M concentration, 50 ㎂ current and 25~97 ㎐ frequency. However, the end-point in titration of cupric sulfate vs. disodium-EDTA couldn't be obtained clearly. The end-point was obtained with the out-of-phase impedance curve on the experimental condition of 0.01 M concentration, 100 ㎂ current, 5~35 ㎐ frequency range. In titration of sodium chloride vs. silver nitrate, the end-point was obtained successfully on the experimental condition of 0.1 M concentration, 100 ㎂ current and 5~47 ㎐ frequency range. This study showed that the impedance phase angle was applicable for the detection of the end-points in redox titration curve, acid-base titration curve, chelate titration curve and precipitation titration curve.

        • 페닐히드라진과 브롬의 반응속도에 관한 연구

          박병빈,양재호,홍춘표 공주대학교 사범대학 과학교육연구소 1984 과학교육연구 Vol.16 No.1

          The reaction of phenylhydrazin with bromine in sulfuric acid solution has been studied kinetically. The rate constants for φNHNH₂+Br₂and φNNH+Br₂has been measured ?? and ?? respectively in 0.1 M H₂SO₄and 0.1 KBr at 15℃ and the activation parameters on the two steps reaction were determined. The pseudo-second-order rate constant is a approxinately in versely proportional to hydrogen-ion concentration when the concentration of sulfuric acid is lower than 1M.

        • SCOPUSKCI등재

          히드라진과 브롬의 반응의 메카니즘에 관한연구

          최규원,박병빈,Q. Won Choi,Byoung Bin Park 대한화학회 1975 대한화학회지 Vol.19 No.6

          히드라진과 브롬의 반응속도를 직접 혼합법 및 일정전류 전해법에 의한 브롬화 이온의 전이시간을 측정하는 방법으로 측정하여, 황산 및 브롬화칼륨의 농도가 작을 때에 2차 반응속도 상수는 각각 $10^5\;및\;10^3mole^{-1}sec^{-1}$로 얻어졌다. 이는 $N_2H_4+Br_2{\rightarrow}N_2H_2,k_1=10^5$ 및 $N_2H_2+Br_2{\rightarrow}X,k_2=10^3$인 것으로 간주된다. 황산과 브롬화 이온의 농도가 클때에는 속도상수가 크게 감소하나 그 원인은 해명하지 못하였다. The rate constant for the $N_2H_4-Br_2$ reaction has been measured in sulfuric acid media by direct mixing method and chronopotentiometric method. The former gave 105 mole-1 l sec-1 whereas the latter 103 mole-1 l sec-1. It has been inferred that the former represents the rate constant for $N_2H_4-Br_2$ {\rightarrow} $N_2H_2$ and the latter for $N_2H_2+Br_2$ {\rightarrow} X. When the concentrations of KBr and $H_2SO_4$ are both high, drastic reduction of rate constant has been observed.

        • 한국 전통차의 중금속 흡착 연구

          최감우,박병빈,류해일 공주대학교 사범대학 과학교육연구소 1998 과학교육연구 Vol.29 No.1

          한국의 전통차(보리, 옥수수, 결명차, 녹차, 두충차)는 물 속에 녹아 있는 인체에 해로운 중금속을 제거하는데 아주 효과적인 것이 실험적으로 증명되어졌다. 차들은 중금속에 대해서 선택적으로 흡착력을 나타내었는데 납(??)은 옥수수, 녹차, 두충차에서 카드뮴(??)은 보리, 녹차, 두충차에서, 수은(??)은 옥수수를 제외하나 모든 차에서 흡착이 잘되었다. 한국 전통차는 양이온을 대부분 잘 흡착하지만 음이온(??)은 흡착되지 않았었다. 전통차는 양이온만을 주로 흡착제거하는 양이온 교환체에 해당한다. 한국 전통차의 흡착제거율은 금속의 산화수가 클수록(??등) 떨어지는데 산화수가 커지면 중금속에 결합하는 흡착제(이온교환체)의 숫자가 많아져야 하기 때문에 흡착력이 떨어지는 것으로 여겨진다. 차를 끓이는 동아나 용액의 pH는 점점 감소하여 약산성이 되는데 이것은 금속과 결합하는 자리에서 떨어져 나온 수소이온의 농도가 증가하기 때문이다. In this study on the metal ion adsorption by the traditional korean teas, it is turned out to be very effective to use the traditional korean tea, for removing harmful heavy metals in water. Lead ion(Ⅱ) is adsorbed by Corn tea, Green tea and Cassiotoralinne tea. Cadmium ion(Ⅱ) is adsorbed by Barley tea, Green tea and Cassiotoralinne tea. Doochung tea is much more effective in removing heavy metals than the other teas used in this study. And ?? is well adsorbed by many teas except Corn tea. The traditional korean teas adsorb heavy metal-cation but don't adsorb anion like ??, ??, and ??, so the traditional korean teas are cation-exchanger. Elimination rate of tea adsorption on heavy metals of high oxidation number metal ion [ex : As(Ⅲ)] is low because the metals need more cation-exchangers. While boiling the teas, the pH of teas are reduced by degrees of pH5∼6. It is because that the number of hydrogen ion is increased by exchanging hydrogen ion with metal ion.

        • 中學校 科學科의 實驗實習 敎材의 開1發硏究Ⅰ

          郭宗欽,朴炳彬,李元求,宋寅命,崔斗文 공주대학교 사범대학 과학교육연구소 1981 과학교육연구 Vol.13 No.1

          The present condition of science education has been investigated b means of questionaires, interviews and referring to literature, and the points at issue gave been extracted on the basis of them, and in consideration of the problems various materials for experiment and practice have been developed to be used for the effective inquiry learning. The present condition and problems of science education in junior high schools are as follows; 1) Science teacher's backgrounds for their teaching profession and majors are good, but they are overburdened and the classes are overcrowded. 2) The textbooks now in use contain too much contents, the levels are high, and the books lack in appropriateness. 3) Especially the contents Presented for experimental activities require too many tasks to be digested in a given time. 4) Experimental facilities or instruments are unsatisfatory in their quantity or quality, and instruments or teaching materials that can be used effectively are far from being sufficient. Futhermore, some experimental instruments are too crude to work successfully. 5) Students' elementary knowledge is not sufficient, and the degrees of their interest or understanding are low. 6) With the teaching methods still conservative and the teachers unable to give satisfactory inquiry leaning. the students are disencouraged. 7) Support of experimental facilities, encouragement of teachers, appropriate school inspection, and administrative or financial aids are desired. In this study, materials for every branch of science have been developed to be available for the effective performance of experiments and practices through inquiry. The materials developed in this study are as follows. 1. The following materials are presented in physics: the relations between the heat quantity of water and the temperature change, and between the heat quantity of the electric heat line and the electric current, for group experiments; the observation of Brown motion, Law of Archimedes, altimeters, comparing the heat capacity of metals, the transmission of radiation, the frictional electricity, the interaction of electric current with magnetic needle, and Fleming's right-hand rule, as the reference materials of demonstration; a program learning materials for diffusion of light with experimental kit utilized in learning the properties of light; a program learning material on the diffraction of light with an experimental kit utilized in learning the diffraction and interference of light. 2. In chenistry, the experimental materials for electrolysis are presented as the teaching-learning material of group experiment. Besides, the errors in the experimental materials and inappropriate expressions in the textbooks now in use are corrected and completed: 3. In biology, problems have been extracted by means of questionaires about the general learning contents and the analisis of Japanese textbooks, and the materials for experiment have been developed. The observation of somatic cell division, that of mold, and that of prothallium are presented as the materials for group experiment. Inquiry learning based on experiment and practice should be settled on the scenes of learning, and the suggestions are made to the effect as follows. 1) The quantity of learning should be reduced, and the levels lowered in the new textbooks. 2) The development and distribution of individual learning materials for the master learning are desirable. 3) The items for group experiment should be reduced to the minimum, and the thorough inquiry learning should be pursued, and the greater part should be replaced by the demonstrative experiments or audio-visual materials. 4) The experimental instruments should be manufactured and distributed on the national scale to ensure their solidity and accuracy. 5) The atmosphere in which inquiry learning is performed by the teacher's creative efforts is greatly needed, To support this conditioning, exhibitions of scientific works should be held continually, science museums operated, the research centers of science education cooperated, new materials for practice developed and studied, and the corporations for research of science education fostered. 6) The measures to lighten the teachers' burden and to encourage them should be contrived.

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