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
28巻
2号
開始ページ 53
終了ページ 58
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307223
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
23巻
1号
開始ページ 39
終了ページ 48
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307518
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
28巻
2号
開始ページ 59
終了ページ 75
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307850
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
28巻
2号
開始ページ 77
終了ページ 84
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307766
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
23巻
1号
開始ページ 49
終了ページ 60
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307622
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
24巻
1号
開始ページ 1
終了ページ 12
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307588
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
23巻
1号
開始ページ 61
終了ページ 68
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307322
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
23巻
1号
開始ページ 69
終了ページ 82
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307988
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
23巻
2号
開始ページ 1
終了ページ 8
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307294
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
24巻
1号
開始ページ 13
終了ページ 24
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307269
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
24巻
1号
開始ページ 25
終了ページ 39
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307454
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
23巻
2号
開始ページ 9
終了ページ 19
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307693
JaLCDOI 10.18926/15473
フルテキストURL Mem_Fac_Eng_OU_26_2_61.pdf
著者 尾坂 明義| Kawabata Kouji| 難波 徳郎| 高田 潤| 三浦 嘉也|
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
26巻
2号
開始ページ 61
終了ページ 67
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307416
JaLCDOI 10.18926/15474
フルテキストURL Mem_Fac_Eng_OU_24_1_53.pdf
著者 尾坂 明義| Takao Seiji| 小田 喜一| 高田 潤| 三浦 嘉也|
抄録 Electrical resistance and X-ray photoelectron depth profile analysis are studied for antimony doped tin oxide films developed on silica, alkali-free and sodalime slide glass substrates. The sodium ions diffused from the substrates to the films prevented the crystal growth of rutile type tin oxide in the film, resulting in the high electrical resistance. A diffusion layer has been detected for each film with diffuse profiles of multi valent cations (Sn, Si or Ca) at the interface of the tin oxide film and substrate. A greater amount of sodium atoms have been detected in the film developed on the soda-lime glass while almost no sodium atoms have been found in those on the other substrates. This can be explained by the diffusion of the sodium ions in the substrate due to a drastic hydronium-sodium exchange mechanism under highly acidic conditions during the dipping and drying processes.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1989-11-29
24巻
1号
開始ページ 53
終了ページ 61
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307279
JaLCDOI 10.18926/15475
フルテキストURL Mem_Fac_Eng_OU_23_2_21.pdf
著者 Myojin Sho| Yamada Masahito| Fujii Naoto|
抄録 Diversion model and disaggregate behavioral model of logit type are adopted as aggregate and disaggregate estimates, respectively. Diversion model is assumed as a binary choice process including diversion ratio function at each step in the process. Diversion ratio is assumed as a function of generalized-travel-time ratio. The function is identified with each of the two steps of diversion; diverson from rail and bus to car at first and from the rest undiverted to bus at second. The data used are those on inter-regional occupational person trips. Each function are found enough and/or critically significant in the statistical sense. At the begginning, sixteen characteristics variables are enrolled in disaggregate model, which are identified by use of the above data. Six variables are reached finally and are all reasonable. A brief comparison of goodness of fit to the data are made between two models.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1989-03-30
23巻
2号
開始ページ 21
終了ページ 32
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307168
JaLCDOI 10.18926/15476
フルテキストURL Mem_Fac_Eng_OU_24_1_63.pdf
著者 山本 尚武| Isshiki Hiromi| 岡 久雄| 山本 辰馬|
抄録 There is no doubt that many people feel the peace of mind or the pleasures of senses in appreciating music. But the estimation of the effect is very difficult and the objective estimation can be hardly done. This study proposed the objective estimating method of human emotion utilizing galvanic skin reflex (GSR) which reflects a human psychological activity. In this method, not by individual response, but by the series of response and pattern of appearance of GSR, the emotional response under appreciating music was investigated. In the case of appreciation of the same classic music to several subjects, the individual GSR responses are random and remarkable characteristic could not be find on the results. However, on the patterns of appearance of GSR, the patterns obtaining from the same generation are much similar each other and the patterns obtaining from different generation are less similar. It was cleared that the same music gave different effect on different generations.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1989-11-29
24巻
1号
開始ページ 63
終了ページ 72
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307670
JaLCDOI 10.18926/15477
フルテキストURL Mem_Fac_Eng_OU_23_2_33.pdf
著者 Ishihara Yuji| 山本 恭二|
抄録 This paper deals with the low Mach numbers flow of a rarefied vapour past a liquid sphere accompanied with condensation and evaporation at its surface. The linearized Bhatnager-Gross-Krook(B-G-K} equation is used for the analysis, and from it the integral equations of the density, temperature and flow velocities are derived. These integral equations are solved numerically over a wide range of the Knudsen number covering from the slip flow to the nearly free molecular flow. The drag on the sphere is also calculated and is compared with that of previous work.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1989-03-30
23巻
2号
開始ページ 33
終了ページ 44
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307401
JaLCDOI 10.18926/15478
フルテキストURL Mem_Fac_Eng_OU_23_2_45.pdf
著者 谷口 健男| Fujiwara, Kohji|
抄録 This paper includes a solver for a large sparse set of linear algebraic equations which are obtained by the application of the finite element method to static structural problems. Proposed method is a modification of Robust Incomplete Choleski-Conjugate Gradient Method, which belongs to Preconditioned Conjugate Gradient Method suitable for supercomputers. Through a number of numerical experiments the authors show that Robust Incomplete Choleski-Conjugate Gradient Method sometimes fails in to obtain the solutions, secondly they clarify the reason of the failures from the theoretical viewpoint, and finally they propose a modification of the robust method by the introduction of the theoretical result. Proposed method is as effective as the original, and it can overcome the demerit of Robust Method which is clarified through numerical experiments.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1989-03-30
23巻
2号
開始ページ 45
終了ページ 55
ISSN 0475-0071
言語 Japanese
論文のバージョン publisher
NAID 120002307820
JaLCDOI 10.18926/15479
フルテキストURL Mem_Fac_Eng_OU_24_1_73.pdf
著者 岡 久雄| Isayama Yoshiharu| 山本 尚武| 山本 辰馬|
抄録 There is a small vibration which goes undetected by the naked eyes. It is called a microvibration (MV) or a minor tremor (MT). The MV on the body surface is expected to apply to a clinical examination of the autonomic nervous system. It is not cleared why and how the MV occurs, but there are many papers about its occurrence and clinical application. In this study, MV measuring system, its estimation and basic characteristics are examined. The difference between head MV and thenar MV, individual MV and diurnal and seasonal change are discussed. The power spectrum of MV is obtained using an autoregressive model.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1989-11-29
24巻
1号
開始ページ 73
終了ページ 80
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307633
JaLCDOI 10.18926/15480
フルテキストURL Mem_Fac_Eng_OU_25_1_1.pdf
著者 Gao Hong| 和田 力| 則次 俊郎|
抄録 How to reduce and simplify the calculation for image recognition is a very attractive and important issue in order to realize the real time control of a robot based on the image recognition results. This paper describes a method of extracting 2 - dimensional geometrical features of cubic objects based on the normal vector distributions from the visual information obtained with the laser range finder to reduce the calculation of the image recognition. In this research a laser beam is scanned in the horizontal plane to which the cubic objects stand vertically and the laser spot is detected with a TV camera every sampling time. These spots make an intermittent locus which includes some special lines corresponding to the cubic objects. To extract the features of the cubic objects, we utilize the normal vectors formed on the locus. If some normal vectors distribute in the same direction and the origin of the normal vectors are very close to their neighbor's, these normal vectors can be classified into the same class, -the straight line class. Because the normal vectors on the neighbor surfaces of the cubic objects are vertical to each other, we use this property to determine the pair of straight lines which belong to the cubic objects. Making the histogram based on the normal vectors with the same direction, we obtain the peaks which are supported by the points on the cubic object surfaces. Then, the points can be extracted from the set of points on the whole locus inversely according to the relations with the peaks and the features of the cubic object can be extracted by applying method of least square to these extracted points. The experiments proved the availability of the proposed processing algorithm.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1990-12-14
25巻
1号
開始ページ 1
終了ページ 13
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308010