| JaLCDOI | 10.18926/15405 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_30_2_39.pdf |
| 著者 | 東辻 千枝子| |
| 抄録 | A simple model for oxygen ion conduction in perovskite compounds is proposed. The potential for an oxygen ion is calculated as the sum of the long range Coulomb potential and short range repulsive potential in a cubic lattice. The activation energy is estimated as the difference in the values of potential at the barrier and at the stable site. When appropriate conditions are satisfied, the activation energy has a minimum as a function of lattice constant in accordance with recent experiments. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1996-03-29 |
| 巻 | 30巻 |
| 号 | 2号 |
| 開始ページ | 39 |
| 終了ページ | 43 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307769 |
| JaLCDOI | 10.18926/15402 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_30_2_27.pdf |
| 著者 | 東辻 浩夫| 岸本 篤也| 東辻 千枝子| |
| 抄録 | The behavior of the Yukawa system in external one-dimensional force fields is analyzed by the molecular dynamics simulation. The formation of layered structures at low temperatures is observed and the relation between the number of layers and characteristic parameters of the system is obtained. Since the Yukawa system serves as a model of clouds of dust particles in plasmas (dusty plasma) which play an important role in plasma processes of semiconductor engineering, the results may be useful to control the quality of semiconductor wafers in such processes. In simulations, periodic boundary conditions are imposed in two dimensions and deformations of periodic boundaries are allowed in order to reduce the effect of boundaries without giving too much constraint on the symmetry. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1996-03-29 |
| 巻 | 30巻 |
| 号 | 2号 |
| 開始ページ | 27 |
| 終了ページ | 37 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307582 |
| JaLCDOI | 10.18926/15401 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_30_2_21.pdf |
| 著者 | Tachibana Hiroyuki| 東辻 浩夫| |
| 抄録 | In order to apply quantum waveguides to electronic devices, we calculate the electrostatic potential in the split-gate quantum wire and establish the relation between the electrostatic potential and the square well potential which is usually assumed in simulations of these waveguides. The height and width of the square well potential are expressed as simple functions of the gate voltage and their dependencies are clarified. The results may be useful in calculating the characteristics of electronic devices based on quantum waveguides as functions of controllable parameters such as gate voltage. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1996-03-29 |
| 巻 | 30巻 |
| 号 | 2号 |
| 開始ページ | 21 |
| 終了ページ | 25 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307620 |
| JaLCDOI | 10.18926/15397 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_30_2_1.pdf |
| 著者 | 竹元 嘉利| 飛田 守孝| 榊原 精| |
| 抄録 | The mechanism of brittle fracture in Ti-14mass % Mo alloy aged for 1x10(6)s at 623K was studied using transmission electron microscopy (TEM) and dynamic hardness test (DHT) on the structure deformed by means of tensile elongation at elevated temperature or cold rolling. Many band products were observed by TEM in either deformed specimens. These band products were identified to neither slips nor twinning bands, moreover, they were different from α , α ' and α " phases. The band product consisted of β phase and granular unknown phase which was transformed by deformation from ω phase. The newly discovered phase, named β" phase, in the band products had a body-centered triclinic structure. The β" was similar to the ω zone with respect to the morphology and the concentration of Mo, but it resembled β in structure. The result of DHT on the band products and the matrix showed that the band products were softer than the matrix. It is suggested that the band products are easily deformed because of the disappearance of obstacles such as ω phase, and consequently behave like paths to lead cracks preferentially. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1996-03-29 |
| 巻 | 30巻 |
| 号 | 2号 |
| 開始ページ | 1 |
| 終了ページ | 7 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307225 |
| JaLCDOI | 10.18926/15393 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_30_2_15.pdf |
| 著者 | 岡 久雄| 藤原 史朗| |
| 抄録 | An estimation of muscle fatigue is very important study and many laboratory researchers had done actively in this field. The excellent measurement and analysis methods, however, have not established yet. The aim of this study was to investigate the muscle fatigue of low back, caused by sitting on the vehicle seat for a long time. The muscle viscoelasticity and the EMG (Electromyogram) were measured. The authors proposed the objective muscle fatigue index that was obtained from the result of PCA (Principal Component Analysis) by using the measured varlables. The objective muscle fatigue index suggests an adequate correlation with the subjective fatigue on the vehicle seat. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1996-03-29 |
| 巻 | 30巻 |
| 号 | 2号 |
| 開始ページ | 15 |
| 終了ページ | 20 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307965 |
| JaLCDOI | 10.18926/15387 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_30_2_9.pdf |
| 著者 | 榊原 精| Kanadani, Teruto| |
| 抄録 | Fatigue strength of Al-Cu alloy was examined by a repeated tensile mode when the specimens were aged and reversion annealed. The specimen quenched from 723K and aged fully around room temperature showed fatigue strength which depended on the existence of soft layer, while the specimen quenched from 723K and aged in the same way showed fatigue strength independent of the existence of the soft layer. Fatigue strength of the specimen, of which the soft surface layer was removed, was the same for either quenching temperature. Fatigue strength became higher when the soft surface layer was thickened with reversion annealing for 600s at 323K after aging. The soft surface layer was thought to increase fatigue strength of the aged Al-Cu alloy as well as Al-Zn alloy. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1996-03-29 |
| 巻 | 30巻 |
| 号 | 2号 |
| 開始ページ | 9 |
| 終了ページ | 13 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307694 |