result 1449 件
| Author | Fujiwara, Takashi| |
|---|---|
| Published Date | 1987-12-30 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume99 |
| Issue | issue11-12 |
| Content Type | Journal Article |
| Author | Fujimoto, Shunji| Yoshioka, Takashi| Kanda, Shigeto| Otsuka, Nagayasu| |
|---|---|
| Published Date | 1988 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume100 |
| Issue | issue5-6 |
| Content Type | Journal Article |
| Author | Tsuda, Takashi| |
|---|---|
| Published Date | 1987-06-30 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume99 |
| Issue | issue5-6 |
| Content Type | Journal Article |
| Author | Tsuda, Takashi| |
|---|---|
| Published Date | 1987-06-30 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume99 |
| Issue | issue5-6 |
| Content Type | Journal Article |
| Author | Yoshioka, Takashi| |
|---|---|
| Published Date | 1988 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume100 |
| Issue | issue1-2 |
| Content Type | Journal Article |
| JaLCDOI | 10.18926/15811 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_20_1_45.pdf |
| Author | Korenaga Takashi| Moriwake Tosio| Takahashi Teruo| |
| Abstract | A simple system was developed for the fully automatic and continuous measurement of chemical oxygen demand (COD) in wastewater samples based on colorimetry of dichromate. A sample and a solution of sulfuric acid (1+1) containing 2mM potassium dichromate are continuously pumped with a double-reciprocating micro-pump at each flow rate of 0.3 ml/min. The wastewater sample is filtered at first with a 100-mesh stainless filter and then mixed with the dichromate solution in the mixing joint. The mixture is introduced into a reaction coil made of poly(tetrafluoroethylene) tubing (1 mm i.d., 3 mm o.d., and 20 m length), being placed in an oil bath (120℃). After reaction, the mixture passes into a quartz tubular flow-through cell (10 mm path length, 18 μl volume) in a spectrophotometer, and the absorbance is measured at 445 nm. The COD value of the sample is automatically estimated from the amount of decreased absorbance. The system was successfully applied to COD measurement of some waters, and to continuous monitoring of COD in wastewater of university laboratories. The system was also evaluated by comparing with the flow injection analyzer system previously developed by the authors. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1985-11-08 |
| Volume | volume20 |
| Issue | issue1 |
| Start Page | 45 |
| End Page | 52 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307695 |
| JaLCDOI | 10.18926/15798 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_19_2_33.pdf |
| Author | Taniguchi Takeo| Mitsuoka Kazuhiko| Terada Takashi| |
| Abstract | This paper treats the convergence condition of the explicit finite element method (i.e. the time and spatial axes are discretized by using the explicit finite difference method and the weighted residual method, respectively) which is applied for analyzing the heat problem in region with complex boundary configuration and also with several material properties. The main role of this study is the application of the Brauer's theorem. As the results we obtain that the usage of the Brauer's theorem is valid and that the application method of the theorem is presented in this paper. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1985-02-25 |
| Volume | volume19 |
| Issue | issue2 |
| Start Page | 33 |
| End Page | 48 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307201 |
| JaLCDOI | 10.18926/15789 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_19_1_53.pdf |
| Author | Korenaga Takashi| Moriwake Tosio| Takahashi Teruo| |
| Abstract | Three methods for determining chemical oxygen demand (COD) by means of flow injection analysis (FIA) with potassium permanganate, potassium dichromate, or cerium(IV) sulfate as oxidant, developed in this laboratory, are described from the point of view of their operating properties. The permanganate method is the most sensitive and common, but forms manganese(IV) oxide precipitate which blocks the FIA lines and connectors. Addition of phosphoric acid in the reagent system is, however, effective to some extent in order to avoid blocking the flow system. The dichromate method is the most workable and stable, but produces toxic wastes containing chromium(VI). The cerium method is the most probable because cerium(IV) is the strongest oxidant of the three and less poisonous. The last method with cerium(IV) sulfate is therefore recommendable to apply to the continuous monitoring of COD in many situation. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1984-11-26 |
| Volume | volume19 |
| Issue | issue1 |
| Start Page | 53 |
| End Page | 62 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307292 |
| JaLCDOI | 10.18926/15779 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_2_107.pdf |
| Author | Totsuji Hiroo| Obata Takashi| Funahashi Takahiko| |
| Abstract | The dynamic form factor and the transverse part of the fluctuation spectrum of momentum density are analysed on the basis of the generalized Langevin equation. According to the indication of the result, numerical experiments are extended and it is shown that the transverse fluctuation spectrum contains two kinds of excitations. The frequency moment sum rules are discussed in relation to one of these excitations. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1981-03-30 |
| Volume | volume15 |
| Issue | issue2 |
| Start Page | 107 |
| End Page | 118 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307901 |
| JaLCDOI | 10.18926/15765 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_1_111.pdf |
| Author | Korenaga Takashi| Ikatsu Hisayoshi| Moriwake Tosio| Takahashi Teruo| |
| Abstract | On the flow injection analysis (FIA) of chemical oxygen demand (COD), silver salt was added as an oxidation catalyst for COD substances and a masking agent for halide to improve operating conditions of the FIA apparatus. Both of a proper concentration of potassium permanganate solution and 6.0 % sulfuric acid solution containing 0.1 % silver nitrate are individually pumped up with respective flow rates of 0.51 ml min(-l) and merged into a carrier stream. A 20 μ1 of sample solution is injected into the flow of sulfuric acid solution at just before the merging place. The sample mixed with the carrier solutions in a reaction manifol(polytetrafluoroethylene tubing: 0.5 mm i.d. x 30 m), is passed through a thermostated bath at 100 °c and led to a flow cell for the absorbance measurements at 525 nm. The absorbances are continuously recorded with time. The peaks in the recordings showed good reproducibility and the calibration obtained at a linear concentration range of 0 - 170 mg 1(-1) COD with glucose as standard. The detection limit and precision confirmed with this method were 5 mg 1(-1) and 0.8 %, respectively. Chloride ion up to 200 mg 1(-1) did not interfere without elimination of a silver chloride precipitate. By the present FIA method, several industrial waste water samples were analyzed at a sampling rate of about 40 samples per hour, and their apparent COD values were compared with those found by the manual JIS method. Both of the methods gave the similar results within an error range from -35 to +5 %. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1980-11-29 |
| Volume | volume15 |
| Issue | issue1 |
| Start Page | 111 |
| End Page | 121 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307490 |
| JaLCDOI | 10.18926/15752 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_14_2_119.pdf |
| Author | Korenaga Takashi| Ikatsu Hisayoshi| Moriwake Toshio| Takahashi Teruo| |
| Abstract | A new method based on the principle of flow injection analysis is presented for the semiautomated determination of chemical oxygen demand (COD) in environmental water samples. The method is rapid and continuous, and suitable for the monitoring of COD in wastewaters. The apparatus used was simply constructed by parts commercially available for high performance liquid chromatography. Teflon tubing heated with a boiling water was used as a reactor and simultaneously used for mixing coils and transmission lines. The operating conditions were examined to apply the determination of COD in wastewaters by using glucose as a standard COD substance. The procedures recommended are as follows: Both 4.9x10(-4) M potassium permanganate and 6.7 % sulfuric acid solutions are individually pumped, 20 μl of a sample solution is injected into the flow of the sulfuric acid solution, and then mixed with a mixing joint. The mixed solution is transported to a flow cell situated in a spectrophotometer fixed at a wavelength of 525 nm, and decrements of absorbance are recorded. The peaks were reproducibly obtained at a concentration range of 10 - 200 mg-COD 1(-1). Chloride up to 1000 mg 1(-1) was not interfered at all. Various wastewater samples were analyzed by the proposed method at a sampling rate of 30 samples per hour, and the apparent COD values obtained were compared with the manual COD ones obtained by JIS method. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1980-03-01 |
| Volume | volume14 |
| Issue | issue2 |
| Start Page | 119 |
| End Page | 129 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307775 |
| JaLCDOI | 10.18926/15688 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_10_2_45.pdf |
| Author | Himei Toyoji| Nakanishi Senichiro| Komatubara Hitoshi| Kawata Sigeo| Onishi Fujio| Tabuchi Takashi| |
| Abstract | When a transformer is energized, the inrush of abnormally high magnetizing current may be noted for a short time until normal flux conditions are established. This may cause the failure of a protective relay, so many preventives are usually accepted for the purpose of normal relay performance. The authors, instead, now have tried to control the inrush current itself, by means of the soft starting method using two reverse parallel thyristors. In this paper, the method to control the inrush current itself, is presented by the soft-starting method using thyristors. The experimental results of this Method verifies the good controlability of the transient magnetic flux of a transformer and then the availability of the control of magnetizing inrush current in the cases of a single phase connection and a three phase one. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1976-01-27 |
| Volume | volume10 |
| Issue | issue2 |
| Start Page | 45 |
| End Page | 54 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307871 |
| JaLCDOI | 10.18926/15572 |
|---|---|
| Title Alternative | A NEW COLORIMETRIC DETERMINATION OF BORIC ACID, BORIC ACID AND FLUORINE CONTENTS OF THERMAL WATERS IN TOTTORI PREFECTURE. |
| FullText URL | 006_034_038.pdf |
| Author | Ashizawa, Takashi| |
| Abstract | A new colorimetric method of determination of boric acid was devised, using ion-exchange resin, mannit and bromthymolblue. With this method determination of boric acid becomes capable by adding one ounce of mannit and ten cc. of resin to an ordinary set for the investigation of mineral waters. This method is suitable for the waters.containing little amount of boric acid and for the samples of small amount. Thermal waters in Tottori Prefecture contain four mg of fluorine and ten mg of metabolic acid per liter in average. |
| Publication Title | 岡山大学温泉研究所報告 |
| Published Date | 1952-03 |
| Volume | volume6 |
| Start Page | 34 |
| End Page | 38 |
| ISSN | 0369-7142 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002307833 |
| JaLCDOI | 10.18926/15569 |
|---|---|
| Title Alternative | CONCENTRATION OF RADIOACTIVE ELEMENTS IN THERMAL. WATERS BY ION EXCHANGE RESIN AND ITS APPLICATION ON ANALYSIS. |
| FullText URL | 006_025_033.pdf |
| Author | Ashizawa, Takashi| |
| Abstract | The author succeeded to concentrate Radium B, Radium C, Thorium B etc. in thermal waters of Misasa almost completely without carrier using ion exchange resin and sulfonated coal. Ion exchange resin is useful for the determination of Th B in the mineral waters. The condition of ion exchange reaction concerning lead and bismuth was investigated. |
| Publication Title | 岡山大学温泉研究所報告 |
| Published Date | 1952-03 |
| Volume | volume6 |
| Start Page | 25 |
| End Page | 33 |
| ISSN | 0369-7142 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002307922 |
| JaLCDOI | 10.18926/15565 |
|---|---|
| Title Alternative | CHROMATOGRAPHIC ANALYSIS OF METALS WITH ORGANIC REAGENTS (2) ANALYTICAL METHOD OF PALADIUM. |
| FullText URL | 006_020_024.pdf |
| Author | Ashizawa, Takashi| |
| Abstract | 0.005r of paladium is detectable by the dithizone chromatographic method. Its absorption band is bluish green and situates between the brownish purple hand of nickel and violet band of cobalt. A micro amount of paladium, such as contained in rocks, can be determined by the dithizone chromatographic method. Interfering ions are eliminated by the combination of copper sulfide and nickel dimethylglyoxime methods. Analytical methods of paladium, nickel, cobalt, and copper by paper chromatograph were investigated. |
| Publication Title | 岡山大学温泉研究所報告 |
| Published Date | 1952-03 |
| Volume | volume6 |
| Start Page | 20 |
| End Page | 24 |
| ISSN | 0369-7142 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002307184 |
| JaLCDOI | 10.18926/15563 |
|---|---|
| Title Alternative | DIRECT COLORIMETRIC AND DIRECT TITRIMETRIC DETERMINATION OF CALCIUM WITH NEW REAGENT (SUPPLEMENTARY REPORT) |
| FullText URL | 006_015_019.pdf |
| Author | Ashizawa, Takashi| |
| Abstract | The author improved the accuracy of the direct colori metric method of calcium determination with azocal-A using an electrophotometer and made an investigation of interfering ions concerning this method. With this improved method calcium content of 0.2-several mgs per liter can be determined using only 5cc. of river water sample with an error of 土10%. Only 2 minutes are enough for a single determination and this method surpassed the ordinary oxalate method in accuracy. |
| Publication Title | 岡山大学温泉研究所報告 |
| Published Date | 1952-03 |
| Volume | volume6 |
| Start Page | 15 |
| End Page | 19 |
| ISSN | 0369-7142 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002307466 |
| JaLCDOI | 10.18926/15561 |
|---|---|
| Title Alternative | CHEMICAL STUDIES ON MISASA HOT SPRING (17) RADIUM B CONTENT AND ITS MEASURING METHOD. |
| FullText URL | 006_012_014.pdf |
| Author | Ashizawa, Takashi| |
| Abstract | With a newly devised method of Ra. B determination using Dithizone extraction the author measured the Ra. B contents of Misasa and Sekigane Hot Springs. This method is applicable to the weakly radioactive waters. Radium B content of Misasa Hot Spring rangeS from 3.0 to 7.2×10(-9) Curie units per liter and the distance of its radon soure from the issuing point was estimated to be 3-25土5 minutes. |
| Publication Title | 岡山大学温泉研究所報告 |
| Published Date | 1952-03 |
| Volume | volume6 |
| Start Page | 12 |
| End Page | 14 |
| ISSN | 0369-7142 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002307330 |
| JaLCDOI | 10.18926/15541 |
|---|---|
| Title Alternative | CHEMICAL STUDIES ON MISASA HOT SPRING (16) ON SINTER DEPOSITS. |
| FullText URL | 006_004_011.pdf |
| Author | Ashizawa, Takashi| |
| Abstract | A calcareous sinter, siliceous sinter, flowers of sulfur, mangan wad, and ferric oxide were found as thermal deposits in Misasa. And the most strongly radioactive sinter deposit in Japan, mangan as its chief constituent, occured in Misasa. A mechanism of its biological production was investigated, but proved negligible. The color of deposits was described with the degree of hue, luminosity and saturation. No simple relationship was recognized between the color, content of iron or mangan, and radioactivity. The soluble silica in thermal waters does not coprecipitate with iron and aluminum at room temperature, but it coprecipitates with aluminum at high temperature. Magnesium ion in spring waters is effective on the coprecipitation of aluminum. A colloidal silica does not exist in the thermal waters of Misasa, but in the thermal sinter deposit an alkalin soluble colloidal silica was contained less than 0.1 per cent. Coexisting bicarbonate ion is proved to be effective on the production of calcareous sinter. Fluorine and arsenic were found concentrated in the sinter deposit. |
| Publication Title | 岡山大学温泉研究所報告 |
| Published Date | 1952-03 |
| Volume | volume6 |
| Start Page | 4 |
| End Page | 11 |
| ISSN | 0369-7142 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002307393 |
| JaLCDOI | 10.18926/15535 |
|---|---|
| Title Alternative | FLOCCULATION VALUE OF MINERAL WATERS. |
| FullText URL | 005_082_083.pdf |
| Author | Ashizawa, Takashi| |
| Abstract | Flocculation value of 24 mineral waters was measured with colloidal solution of iron hydroxide. There exists a negative correlation (r=-0.72, Fo=(r(2)(N-2))/(1-r(2)) =21.6 >F=8.10 n1=1 n2=20 α=0.01) between the logarithms of sulfate ion concentration of the mineral waters and their Flocculation value. |
| Publication Title | 岡山大学温泉研究所報告 |
| Published Date | 1951-08 |
| Volume | volume5 |
| Start Page | 82 |
| End Page | 83 |
| ISSN | 0369-7142 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002307827 |
| JaLCDOI | 10.18926/15534 |
|---|---|
| Title Alternative | MICROANALYSIS OF ALUMINUM AND IRON. |
| FullText URL | 005_076_081.pdf |
| Author | Ashizawa, Takashi| |
| Abstract | アルミニウムと鉄の満足な分離定量法は,現在知られていない.微量のアルミニウムの定量法としては,各種色素のレーキ生成による比色法もあるが,最も優れた方法はオキシン法である.鉄定量は専ら各種の比色法又は容量法に依っているが,微量の場合は実際にはロダン法が用いられている.食塩泉に存在 する様な,1l中数mg以下の,アルミニウム及び鉄の実用的な分析方法を確立する必要を感じ,従来法を改良し,満足な結果に到達した.鉄はロダン法又はサリチル酸法,アルミニウムはヘマトキシリン,又はアルミノン,オキシン法が用いられた.本法の特徴は,鉄をロダン錯塩としてアミルアルコールで完全に抽出し定量し,残液でアルミニウムをアルミノン,オキシン等で定量する一貫した方法であることにある.現在のアルミノン法は鉄の妨害のために実用化されていない.鉄の定量の際の弗素の影響は余り関心を持たれていないが,温泉水には著量の弗素を含むものがある.それでこの妨害を避けて,サリチル酸法に硝酸トリウムを用い,正確に,比色する方法を考案した. |
| Publication Title | 岡山大学温泉研究所報告 |
| Published Date | 1951-08 |
| Volume | volume5 |
| Start Page | 76 |
| End Page | 81 |
| ISSN | 0369-7142 |
| Related Url | http://eprints.lib.okayama-u.ac.jp/15926 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002307272 |
