検索結果 9297 件
| JaLCDOI | 10.18926/15473 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_26_2_61.pdf |
| 著者 | Osaka, Akiyoshi| Kawabata Kouji| Nanba, Tokuro| Takada, Jun| Miura, Yoshinari| |
| 抄録 | Mullite-dispersed silica ceramics were prepared through sol-gel processing by the use of tetraethoxy silane, aluminium nitrate and aluminium isopropoxide as the Si and Al sources where HCl and HN0(3) were the catalyst. Effect of the starting materials, solvents and catalysts was examined on the gelation time or temperature of mullite precipitation. Apparent activation energy of gelation ranged from 80 to 95kJ/mol. The presence of AI in the sols elongated the gelling time suggesting the formation of chelate bonds between AI and Si-OR or Si-OH bonds. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1992-03-28 |
| 巻 | 26巻 |
| 号 | 2号 |
| 開始ページ | 61 |
| 終了ページ | 67 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307416 |
| JaLCDOI | 10.18926/15472 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_23_2_9.pdf |
| 著者 | Kuroda Tsutomu| 大崎 紘一| 松田 正明| Fujisawa Keita| |
| 抄録 | Multi-item flexible manufacturing systems have been spread to correspond the short life-cycle and the diversification of products. Part handling plays an important role to operate multi-functional robot efficiently in these systems, and many jigs are widely used to hold a part. They should be exchanged at once according to changing products. In this paper, we propose a pin jig which holds a part with two pins, and design method of the position, length and diameter of those pins for a cylindrical part. This jig has the following characteristics. As a surface of the jig is inclined to use gravity, the part can be fixed without any external forces. Therefore the structure of jig becomes simple, and loading and unloading of a part becomes easy for a robot hand. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1989-03-30 |
| 巻 | 23巻 |
| 号 | 2号 |
| 開始ページ | 9 |
| 終了ページ | 19 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307693 |
| JaLCDOI | 10.18926/15471 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_24_1_25.pdf |
| 著者 | 梶原 康博| 大崎 紘一| |
| 抄録 | An expert system, in which preconditions and rules are expressed in logical formulas, is developed to support the scheduling of an automated job shop type multi-item assembly line. This system has the foIIowing characteristics to apply any case of schedulings: (1)Forward scheduling orbackward scheduling can be made. (2)The criterion on the input order of products, the dispatching process at each assembly station, and the selection of products from a buffer can be selected from several priority criteria. (3)Layout, number and velocity of vehicles, and the capacity of each buffer can be changed. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1989-11-29 |
| 巻 | 24巻 |
| 号 | 1号 |
| 開始ページ | 25 |
| 終了ページ | 39 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307454 |
| JaLCDOI | 10.18926/15470 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_24_1_13.pdf |
| 著者 | Uno, Yoshiyuki| Nakajima, Toshikatsu| Endo, Osamu| |
| 抄録 | The generation mechanism of crater in electrical discharge machining is analyzed with a single pulse discharge device for alloy tool steel, black alumina ceramics, cermet and cemented carbide, investigating the gap voltage, the discharge current, the shape of crater, the wear of electrode and so on. The experimental analysis makes it clear that the shape of crater has a characteristic feature for the kind of workpiece. The shape of electrode, which changes with the wear by an electric spark, has a significant effect on the shape of crater. The diameter and the depth of crater have a close relation to the discharge energy for alloy tool steel, black alumina ceramics and cermet, while those for cemented carbide are related to the discharge current. The shape factor which is the ratio of the depth to the diameter of crater is different for the work material. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1989-11-29 |
| 巻 | 24巻 |
| 号 | 1号 |
| 開始ページ | 13 |
| 終了ページ | 24 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307269 |
| JaLCDOI | 10.18926/15469 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_23_2_1.pdf |
| 著者 | Kamiyabu, Hideto| 榊原 精| Maeda, Hironobu| 飛田 守孝| |
| 抄録 | Surface tension (γ(L)) and contact angle (θ) of gallium related to wettability on Teflon and other substrates (Al(2)O(3), SiO(2), glass, graphite, BN, AI, Ni, As etc.) were investigated. The values of Teflon were 0.70(6)N/m and 158° in pure argon atmosphere, and the ones of other substrates were listed in a table in this text. We were interested especially in the relative values, γ(L)'s, on the substrates as compared with γ(L) on Teflon substrate. Liquid Ga showed spreading wetting on pure Ni metal and adhesional wetting on Al (supposed to be covered by A1(2)O(3)) and on metallic polycrystal As. Surface tension of Ga was remarkably decreased by a kind of oxide contamination due to oxygen in air. The surface layer coated by the contamination was of amorphous state nearly same as liquid Ga. The amorphous coat caused liquid Ga rather high supercooling of △T~35K. It seems that the contamination layer (oxide fi1m) smeared the crystal nucleation sites on the free surface of liquid Ga |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1989-03-30 |
| 巻 | 23巻 |
| 号 | 2号 |
| 開始ページ | 1 |
| 終了ページ | 8 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307294 |
| JaLCDOI | 10.18926/15468 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_23_1_69.pdf |
| 著者 | 東辻 浩夫| Takei Makoto| |
| 抄録 | The statistical properties of two-dimensional systems of charges in semiconductor superlattices are analyzed and the dispersion relation of the plasma oscillation is calculated. The possibility to excite these oscillations by applying the electric field parallel to the structure is discussed. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1988-11-22 |
| 巻 | 23巻 |
| 号 | 1号 |
| 開始ページ | 69 |
| 終了ページ | 82 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307988 |
| JaLCDOI | 10.18926/15467 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_23_1_61.pdf |
| 著者 | 山本 尚武| 山本 辰馬| |
| 抄録 | Skin impedance satisfies the Cole-Cole arc's law. The change of skin impedance during GSR (Galvanic Skin Reflex) can be expressed by the change of equivalent parallel resistance approximately. Using these characteristics, the complicated change of skin impedance during GSR can be determined continuously from the measurement value in one frequency point. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1988-11-22 |
| 巻 | 23巻 |
| 号 | 1号 |
| 開始ページ | 61 |
| 終了ページ | 68 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307322 |
| JaLCDOI | 10.18926/15466 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_24_1_1.pdf |
| 著者 | 吉田 彰| 大上 祐司| 藤井 正浩| |
| 抄録 | To clarify the effects of a drive system lubricant additive upon rolling fatigue of rollers manufactured from carburized and hardened steel, three types of oil were used as lubricants: one mineral base oil and the other two mineral base oils to which an S-P additive package and ATF additive package were added, respectively. These specimens were tested for sliding/rolling fatigue and examined for failure on the surface, rolling fatigue strength, and other properties. Roller surface temperatures and inter-roller frictional coefficients were found scarcely affected by the type of oil used. Irrespective of the difference in oil type, failure on the surface was found to be entirely spalling attributable to cracks generated in the subsurface. The depth at which spalling cracks had taken place was found nearly coincident with the depth at which a ratio of reversing orthogonal shear stress to hardness had amplitude A(Tyz/Hv) maximized. These depths were larger as Hertz stress became more prominent. Nevertheless, they were found hardly affected by the type of oil. Although rolling fatigue strength did not show a significant difference dependent upon the type of oil, it may be said that fatigue life would be somewhat negatively affected by an extreme pressure coated film with a content of sulfur and phosphorus. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1989-11-29 |
| 巻 | 24巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 12 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307588 |
| JaLCDOI | 10.18926/15465 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_23_1_49.pdf |
| 著者 | 岡 久雄| 山本 辰馬| Isayama Yoshiharu| |
| 抄録 | In the field of dental study it is most fundamental and necessary to estimate the condition of periodontium. In order to examine a mechanical characteristics of periodontium, the theoretical displacement response to periodontal mechanical model (three elements model) are strictly solved in case of some pulse excitations. Impact excitations (rectangular, triangular and half-cycle sine pulse) are given in physical and mathematical definitions and complete solutions to the impact excitations are provided. The triangular pulse excitation which is obtained by means of a fracture of pencil-lead is most suitable. The mechanical parameters of periodontium are given using this input excitation. This is experimentally confirmed by artificial tooth model. The obtained mechanical characteristic of the periodontal tissues can be applied to clinical diagnosis. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1988-11-22 |
| 巻 | 23巻 |
| 号 | 1号 |
| 開始ページ | 49 |
| 終了ページ | 60 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307622 |
| JaLCDOI | 10.18926/15464 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_28_2_77.pdf |
| 著者 | 尾坂 明義| Kawamura Haruyuki| 三浦 嘉也| |
| 抄録 | Amorphous films of lead oxyfluorosilicate were prepared with a rf-sputtering technique, and the distribution profiles of the component elements and chemical states of the fluoride ions were analyzed with an X-ray photoelectron spectrometer. Si atoms with an expanded coordination, O(4)Si-F, were present near the surface, and O(3)Si-F units were present in the deeper part of the films. Electrical resistance indicated transition to a conduction state for the films containing fluoride ions, while the films were crystallized to precipitate low quartz by the irradiation of He-Ne laser of 3 mW up to 1 sec. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1994-03-15 |
| 巻 | 28巻 |
| 号 | 2号 |
| 開始ページ | 77 |
| 終了ページ | 84 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307766 |
| JaLCDOI | 10.18926/15463 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_28_2_59.pdf |
| 著者 | 西垣 誠| Sun Yao| 河野 伊一郎| |
| 抄録 | In this paper, first, an elasto-plastic consitituve equation for unsaturated soil was developed by considering of the basically behavior of unsaturated soil. Second, the results of a number of triaxial test and a set of rigid foundation model tests were simulated by using this constitutive equation, the agreement between observed and computed results was satisfactory and confirms the possibilities of this constitutive equation. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1994-03-15 |
| 巻 | 28巻 |
| 号 | 2号 |
| 開始ページ | 59 |
| 終了ページ | 75 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307850 |
| JaLCDOI | 10.18926/15462 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_23_1_39.pdf |
| 著者 | 尾坂 明義| Yuasa Motokazu| 三浦 嘉也| 高橋 克明| |
| 抄録 | Sodium borosilicate gels of compositions similar to that of Vycor(R) glass like 80SiO(2).15B(2)O(3).5Na(2)O (wt%) were prepared from hydrolysis and polycondensation of metal alkoxides under the HCl catalysis. Variation of specific surface area and porosity with temperature indicated that closed pores were opened below 400℃, and collapsed above 450℃ after the porosity reached a maximum value around 450℃. The structural evolution was examined due to IR spectra and a phase separation in the gels was observed. The solubility of the gels into 1N-HCl was studied as a function of the treatment temperature. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1988-11-22 |
| 巻 | 23巻 |
| 号 | 1号 |
| 開始ページ | 39 |
| 終了ページ | 48 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307518 |
| JaLCDOI | 10.18926/15461 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_28_2_53.pdf |
| 著者 | 東辻 千枝子| Matsubara Takeo| Miyata Satoru| |
| 抄録 | One of the best known solid solution of perovskites is the PbTiO(3)-PbZrO(3) system which is usually abbreviated as PZT. In the phase diagram of this system, there is a drastic phase change from tetragonal to rhombohedral at the molar ratio around 50:50. The PZT crystals are widely used as a practical piezoelectric material because of its very strong piezoelectric effect near this morphotropic phase boundary. We try to explain this anomaly in piezoelectric constant by a phenomenological theory. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1994-03-15 |
| 巻 | 28巻 |
| 号 | 2号 |
| 開始ページ | 53 |
| 終了ページ | 58 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307223 |
| JaLCDOI | 10.18926/15460 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_28_2_45.pdf |
| 著者 | 東辻 浩夫| 橋本 成仁| 奈良 重俊| |
| 抄録 | Difficulties in simulating systems composed of classical and quantum particles lie in the treatment of the many-body interactions between quantum particles and the geometrical variety of configurations of classical particles. In order to overcome these difficulties, we have developed some numerical methods and applied them to simple cases. As for stationary states, the finite element method provides us with sufficient geometrical freedom. Combined with the Kohn-Sham equation based on the density functional theory, this method virtually satisfies our requirement. In order to investigate time-dependent phenomena, we apply the time-dependent Kohn-Sham equation. Adopting the finite difference method, we are able to follow the development of quantum many-body system. As an example, we estimate the effects of the potential height, the electric field, and many-body interactions in some transition processes in quantum wells coupled by a tunneling barrier. This example is important in itself in relation to semiconductor superlattices and also serves as a benchmark for quantum simulations, variety of geometry corresponding to that of classical particles. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1994-03-15 |
| 巻 | 28巻 |
| 号 | 2号 |
| 開始ページ | 45 |
| 終了ページ | 52 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307158 |
| JaLCDOI | 10.18926/15459 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_23_1_31.pdf |
| 著者 | 三浦 嘉也| Yuasa Motokazu| 尾坂 明義| 高橋 克明| |
| 抄録 | Sodium borosilicate gels of compositions similar to that of Vycor(R) glass like 80SiO(2).15B(2)O(3).5Na(2)O(wt%) were prepared from hydrolysis and polycondensation of tetraethyl orthosilicate, trimethyl borate, and sodium methylate under the HCl catalysis. Variation of the gelation time is examined as a function of the mixing ratio of the starting materials and the catalyst. The thermal behavior of the gels has been discussed on the basis of their TG and DTA traces. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1988-11-22 |
| 巻 | 23巻 |
| 号 | 1号 |
| 開始ページ | 31 |
| 終了ページ | 38 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307464 |
| JaLCDOI | 10.18926/15458 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_28_2_33.pdf |
| 著者 | Wang, Ming| Ahmed, Anis| 和田 修己| 古賀 隆治| |
| 抄録 | Proposed here is a convenient optical system to collimate the crescent shaped blue laser beam radiated from a Cerenkov SHG in channel waveguide configuration. This collimation system is consisted of a parabolic mirror and has a very large tolerance to the mirror displacement. The anisotropy of the nonlinear crystal on which the waveguide is fabricated has been taken into account. The optimum mirror location is given to obtain a collimated blue laser beam with an aberration less than 0.07λ. By using an objective lens, the collimated beam can be focused down to a thin beam with the spot size less than 1μm. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1994-03-15 |
| 巻 | 28巻 |
| 号 | 2号 |
| 開始ページ | 33 |
| 終了ページ | 44 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307149 |
| JaLCDOI | 10.18926/15456 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_28_2_21.pdf |
| 著者 | 山本 恭二| Jiao Xuezhen| |
| 抄録 | An experimental investigation has been made of the cyclone dust collector with a perforated internal rotating cylinder. The size of the rotating cylinder is of 0.5D, where D is the diameter of the cyclone body, and is the same size as the outlet tube. The dust collection efficiency as well as the pressure loss has been measured when the inlet flow speed is 9 ~ 21 m/s and the rotating speed of the cylinder is 37 ~ 63 m/s. The velocity and pressure distributions were also measured. It is found that the collection efficiency decreases and the pressure loss increases as the rotating speed increases. It is also shown that both the inward radial velocity and the upward vertical velocity become large as the rotating cylinder increases its speed. As a whole, the rotation of the internal cylinder makes worse performance of the cyclone dust collector. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1994-03-15 |
| 巻 | 28巻 |
| 号 | 2号 |
| 開始ページ | 21 |
| 終了ページ | 31 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307575 |
| JaLCDOI | 10.18926/15455 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_23_1_1.pdf |
| 著者 | 松田 正明| 大崎 紘一| |
| 抄録 | Display equipment has been used as communication media in the factory, office, and home. In order to communicate effectively, it is necessary to clarify the characteristics of eye movement in the case of looking at the display. The development of Eye Camera enables us to measure eye movement during work, so that we can collect the many data of eye movement during work. In this study, we proposed a method to evaluate the visual work using the distribution of visual points in X and Y axis. The cumulative distribution is approximated by the logistic curve which shows the symmetry and kurtosis by the parameter. The proposed method was applied to the three typical display models, that is, the digital meter model, reading model, and game model. In the digital meter model, the visual points were distributed symmetrically along the meters, and the symmetry and kurtosis of the distribution varied by the arranged direction of the meter. In the reading model, the visual points were distributed nearly symmetrically and uniformly in each axis and they were moved around the character and line from the period of spectrum analysis. In the game model, the visual points moved according to the target and were distributed symmetrically in the Y axis. And whether the target moved vertically or horizontally, the kurtosis of the distribution became equal in each axis. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1988-11-22 |
| 巻 | 23巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 12 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307354 |
| JaLCDOI | 10.18926/15454 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_22_63.pdf |
| 著者 | Myojin Syo| Kishino Keiichi| Yamada Masahito| |
| 抄録 | The paper is a case study mode choice in interregional occupational person trips. Disagregate behavioral model of logit type is applied to the occupational person trips from Tsuyama area in Okayama Prefecture to Osaka area. The model turned out to give asignificant explanation of the interregional mode choice characteristics. Travel time, travelling expenses and " with or wi thout heavy baggage " were found to be significant. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1988-03-31 |
| 巻 | 22巻 |
| 開始ページ | 63 |
| 終了ページ | 70 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307421 |
| JaLCDOI | 10.18926/15453 |
|---|---|
| フルテキストURL | Mem_Fac_Eng_OU_28_2_13.pdf |
| 著者 | Kusumoto, Hisao| 飛田 守孝| 榊原 精| Nishida, Norihide| 竹元 嘉利| 山田 益男| |
| 抄録 | The strain in Si substrate induced by locally ion-plated thin film of TiN was observed by X-ray topograph (Lang technique). Circular TiN film was deposited on one side of the Si surface. In all topographs the highest blackness attributed to kinematical diffraction effect occurred at the film edge. Rosette pattern with four-lobes was observed around the film. Blackness as a whole increased with the film thickness. Strain was observed in the depth direction of substrate by limited projection method. When the slit width was narrowed, the kinematical images disappeared, and white images appeared at the film edge. All the contrast disappeared when the TiN film was completely removed in boiling HNO(3). The strain induced by the film deposition was proved to be elastic. |
| 出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |
| 発行日 | 1994-03-15 |
| 巻 | 28巻 |
| 号 | 2号 |
| 開始ページ | 13 |
| 終了ページ | 20 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307150 |