산 적정에 의한 텅그스텐의 정량 (제2 보)

이원해 대한금속재료학회(대한금속학회) 1973 대한금속·재료학회지 Vol.11 No.1

Wolfrmate 이온, WO₄^=을 염산으로 중화하면 WO₄^=에 결합한 H^+의 평균수(Z)가 1.15보다 작은 영역에서는 산을 가하자 곧 안정된 전극전위가 얻어진다. 그러나 한편 Z>1.15에서는 반응속도가 느려서 전위는 장시간 서서히 변한다. Z=1.15 근방에서는 산을 가한 1분후에 pH 변동은 매분 0.01 내지 0.02 pH 정도이다. 다량의 중성염의 존재하에서 WO₄^=의 중화곡선은 pH 4와 5사이에 큰 pH 변화를 나타낸다. 반응속도가 느린 영역에서 산을 가한후 2내지 3분후 전극 전위를 측정하면 Z=1.148±0.001인 곳에 중화곡선의 변곡점이 생긴다. 이점은 반응속도가 느린 영역이 시작되는 점에 바로 인접해 있으므로 변곡점을 결정하는데 반응속도가 느린 영역에서 다만 1회 또는 2회의 pH 측정만을 필요로 한다. 충분한 량의 중성염의 존재하에서는 변곡점 근방에 전위변화는 매우 커서 반응속도에 기인된 적은 전위변동은 적정의 재현성에 영향이 없었다. 따라서 WO₄^=는 다량의 중성염의 존재하에 전위차 적정으로 재현성있는 적정이 가능하였다. 그리고 탄산염 및 molybdate의 영향을 조사하였으며 wolframate가 isopolyacide들로 존재할 때의 분석법도 기술하였다. The neutralization of wolframate ion, WO₄^=, was studied in the presence of neutral salt. The equilibrium was established quickly for the region smaller than 1.15 of average number of H^+ bound per WO₄^=(Z). For the region of Z>1.15 the potential was found to drift slowly for long time without reaching a stationary value. At the region of Z=1.15 the potential drifted rapidly for tire first one minute after each addition of the acid, and then the rate of the drift was only 0.01 to 0.02 pH unit per minute. The neutralization curve of wolframate shows large potential break in the presence of neutral salt. The inflection point of neutralization curve appears at the point of Z=1.148±0.001 when the potentials were measured two to three minutes later after each addition of acid at the region of slow reaction. Only one or two potential measurements are enough to locate the inflection point at slow reaction range since the inflection point lies at the neighbour of starting point of slow reaction. In the presence of enough neutral salt the potential break was so large that such small changes of potential did not affect the accuracy of the titration. Also the influences of molybdate and carbonate have been studied. Analytical procedure was described for the determination of tungsten in the synthetic mixtures.

아연도금 작업표준

이원해,이주성,조만형 대한금속재료학회 1982 대한금속재료학회 학술대회 개요집 Vol.1982 No.0

핑거루트를 첨가한 탁주의 품질특성

이원해,조재철 (사)한국조리학회 2018 한국조리학회지 Vol.24 No.1

In this study, the traditional takju was manufactured using the finger root, which was recognized as a health functional ingredient, and analyzed the physicochemical and sensory quality characteristics according to the period of fermentation. The pH was significantly low(p<0.05) in all samples until the second day of fermentation, and the pH tended to increase again from the third day of fermentation. The pH value was decreased as the amount of finger root was decreased(p<0.05). The acidity of takju was significantly lower at 0.17~0.21 immediately after fermentation(p<0.05). The acidity of FR0 showed significantly the highest value(p<0.05). The sugar content of takju was significantly increased in all the samples until the 2nd day of fermentation(p<0.05). On the 7th day, it showed the lowest value at 11.01~ 12.63 ° Brix. The sugar content of FR0 was significantly lowest value(p<0.05). The alcohol content of takju was significantly increased as the fermentation proceeded, and the highest value was 11.90~13.50% at 7 days(p<0.05). The alcohol content of RF0 was significantly higher than other samples(p<0.05). As a result of organic acid analysis of finger root takju fermented for 7 days, citric acid(3.35%) showed the highest content of FR3(p<0.05). The content of fructose increased with increasing finger root amount (p<0.05). As a result of sensory evaluation of finger root takju, FR1 and FR2 samples tended to be lower in score than FR0, and FR3 showed the highest score. The overall acceptance value of FR0 was 7.5 and FR3 was 7.57.

아연도금 (亞鉛鍍金) 작업표준

이원해,조만형,이주성 대한금속재료학회 1982 대한금속재료학회 학술대회 개요집 Vol.1982 No.1

방풍나물 분말 첨가 양갱의 품질특성

이원해,유승석,홍기운 (사)한국조리학회 2018 한국조리학회지 Vol.24 No.1

This study developed a new yanggaeng(red bean sweet jelly) by adding Peucedanum japonicum powder from 5% to 20%. It has been evaluated its physicochemical, sensory characteristics and antioxidant activity. The DPPH radical scavenging activity of Peucedanum japonicum powder was 40.53% and the total phenolic compound content was 13.36 mg/100 g. Moisture content of yanggaeng with Peucedanum japonicum powder added 5~15% was 50.24~48.32% significantly higher than in the control group(p<0.05). The hardness of yanggaeng was 2,748.25 g/m2 in control and the PY5 and PY10 were 4,012.05 g/m2 and 4,019.40 g/m2 respectively, significantly higher than control(p<0.05). However, when the amount of Peucedanum japonicum powder was increased by more than a certain rate, it decreased again, as 2,155.39 g/m2 in PY20. As a result of the acceptance test of the yanggaeng, the flavor of yanggaeng with Peucedanum japonicum powder was evaluated significantly higher than control(p<0.05), but PY20 was 5.20 not significantly difference with PY10. The overall acceptance of the yanggaeng showed the lowest value of 4.00 in the control, PY15 showed significantly high value as 7.80(p<0.05). Compared with the control, the acceptance of samples with Peucedanum japonicum powder 5~15% was higher than that of control. It was concluded that 10% and 15% of the Peucedanum japonicum powder could be added for the development of the yanggaeng. According to the above study result, to enhance the utilization of Peucedanum japonicum for developing functional food would be possible, and a new yanggaeng product by adding Peucedanum japonicum would have good potential.

금속 창연의 저해정제

이원해,이승평 대한금속재료학회(대한금속학회) 1971 대한금속·재료학회지 Vol.8 No.4

진해조는 가운데를 cell의 저면에는 닿지 않고 Bi-amalgam에만 닿도록 격막으로 막은 두개의 compartment로 되어 있어서 Bi-amalgam은 자유로이 다닐 수 있으나 전해액은 한쪽에서 다른쪽으로 다니지 못하게 하였다. stirrer로 교만하고 있는 Bi-amalgam의 한쪽은 anode로, 다른쪽은 cathode로 작용하도록 하였다. refining solution으로 사용한 전해액의 성분은 Bi(ClO₄)₃와 HClO₄이며, Cathode 전류 밀도는 5A-15A/dm²가 가장 좋았고, 전류 효율은 100%였다. 98% Bi를 사용하여 amalgam refining을 해본 결과 5-9s보다 더 순수한 Bi를 얻을 수 있었다.

행정학과 교과과정 개선을 위한 모색

이원일(李遠?),허철행(許喆行) 한국지방정부학회 2003 지방정부연구 Vol.7 No.3

수용액에서 Ti(OH)4 및 Fe(OH)3 의 우라늄흡착거동에 관한 연구

이원해,김진현 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.7

With a view to studying the possibility of separating uranium from aqueous solution by coprecipitation, the carrier properties of ferric and titanium hydroxides were examined. The results obtained were as follows. The values of pH at which uranium started to coprecipitate with the carriers were 3.0 for Ti(OH)₄, 4.0 for Fe(OH)₃ and optimum pH values to obtain maximum recovery of uranium were 6.0∼10.0 for Ti(OH)₄, 6.0∼8.0 for Fe(OH)₄, respectively. It was found that the HCO₃ ion had a negative effect on uranium adsorption when its concentration was higher than 5.0mM. And the relation between equilibrated uranium adsorption and the concentration of uranium in the aqueous solution followed Freundlich's isotherm formula in the region of low concentration. The uranium in the aqueous solution which was not adsorbed was determined by Arsenazo III method.

요오드 용액에서 팔라듐의 용해 속도론

이원해,최준철 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.10

A series of experiments were performed to investigate the kinetics of dissolution reaction between palladium powder and iodide solution. This investigation examined the effects of oxygen, pH, iodide and iodine concentration, initial PdI₄² concentration and temperature on the dissolution of palladium. A half order reaction rate was found with respect to I₃^- and a third order reaction rate with respect to I^-. But the reaction rate was decreased with increasing initial concentration of PdI₄^(2-). The activation energy of reaction was 2.4kJ/mole, which implied that the dissolution reaction was controlled by the diffusion reaction.

포도막염 환자의 임상병리학적 연구

이원해 순천향대학교 1992 논문집 Vol.15 No.4

The author conducted a retrospective study of 40 patients with uveitis, ages ranged from 14 to 73, and classified those patients as anterior uveitis, panuveitis and pars planitis. The frequencies of occurence, causes and clinical laboratory tests were compared to those. The results were as follows. 1. Of the 40, 33(82.5%) were anterior uveitis, 3(7.5%) were posterior uveitis, 2(5%) were panuveitis. 2(5%) were pars planitis. Of the 40, 22(55%) were idiopathic, 4(10%) were Behcet's disease, 3(7.5%) were traumatic. 2. Of the 40. 27(67.5%) have positive findings that is one or more among the 12 classes of clinical laboratory tests. 13(32.5%) have negative findings in overall tests. 3. In the roentgenography, 1(2.5%) has positive finding, and 3(7.5%) have positive findings in the routine urinary analysis. 4. In the test of complete blood count, 11(27.5%) showed increased blood count. Neutrophil count was higher in the posterior and panuveitis than in the anterior uveitis and panplanitis. 5. In the test of erythrocyte sedimentation rate, panuveitis showed the highest value, anterior uveitis showed the lowest value in average. 6. 1(2.5%) was positive in teh test of VDRL and FTA-ABS, all were negative in the test of antinuclear antibody test, 2(5%) were positive in teh test of rheumatoid factor. 7. In the Behcet's skin test, 2(5%) were positive, of whom, one was anterior uveitis, 1(33%) with posterior uveitis, 1(50%) with pars planitis. 8. In the test of ELISA, 18(55%) showed positive ratio in the patients with anterior uveitis, 1(33%) with posterior uveitis, 1(50%) with pars planitis. 9. In the test of serum electrophoresis, 1(33%) showed the positive ratio in the posterior uveitis, 1(50%) with panuveitis, 2(6%) with anterior uveitis. 10. All of 12 recurrent cases(30%) had anterior uveitis. Of these patients, 42% showed increased WBC count, while 27.5% showed increased WBC count in the uveitis patients with first attack.