result 3683 件
| JaLCDOI | 10.18926/15453 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_28_2_13.pdf |
| Author | Kusumoto, Hisao| Hida, Moritaka| Sakakibara, Akira| Nishida, Norihide| Takemoto, Yoshito| Yamada, Masuo| |
| Abstract | 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. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1994-03-15 |
| Volume | volume28 |
| Issue | issue2 |
| Start Page | 13 |
| End Page | 20 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307150 |
| JaLCDOI | 10.18926/15448 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_28_2_1.pdf |
| Author | Takemoto, Yoshito| Sakakibara, Akira| Hida, Moritaka| |
| Abstract | Fine particles of Ti-Mo alloy have been prepared by means of arc method, and investigated on internal structure and phase transformation using HR-TEM and EDS. Martensite phase was observed in a particle containing comparatively low concentration of Mo, and ω phase was also found to exist in a nearly 14 % M0 particle. The structure of the ω phase in the fine particle is expanded and remarkably unstable in comparison with the bulk sample, so that it has disappeared in a few seconds during TEM observation. Moreover, the β structure of Ti-Mo particles has changed to the unusual fcc phase with irradiation of a strong electron beam. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1994-03-15 |
| Volume | volume28 |
| Issue | issue2 |
| Start Page | 1 |
| End Page | 7 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307644 |
| JaLCDOI | 10.18926/15438 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_28_1_61.pdf |
| Author | Takeshita, Yuji| Kohno, Iichiro| |
| Abstract | Knowledge of the unsaturated soil hydraulic properties is essential requirement for prediction of seepage flow and contaminant transport through the vadose zone. Unfortunately, these parameters are usually time consuming and expensive to measure in the field and laboratory. At the present condition, there are few data accumulation for Japanese soils. In this paper, van Genuchten's closed-form expressions are described to estimate unsaturated soil hydraulic properties. To evaluate the adequacy of these expressions, comparisons are performed between observed and calculated unsaturated hydraulic properties for typical Japanese soils. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1993-11-30 |
| Volume | volume28 |
| Issue | issue1 |
| Start Page | 61 |
| End Page | 69 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307801 |
| JaLCDOI | 10.18926/15436 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_26_2_69.pdf |
| Author | Fujii, Tatsuo| Sakata Naoki| Nanba, Tokuro| Osaka, Akiyoshi| Miura, Yoshinari| Takada, Jun| |
| Abstract | (001)-oriented Ti(2)O(3) films were epitaxially grown on a(001)-face of sapphire single-crystalline substrate by an activated reactive evaporation method. The formation ranges of stoichiometric and nonstoichiometric Ti(2)O(3) films were determined as a function of the substrate temperature (Ts), the oxygen pressure (Po(2)) and the deposition rate. Stoichiometric Ti(2)O(3) films were grown at Ts≧673K under Po(2)≧1.0×10(-4)Torr, which showed the metal-insulator transition with a sharp change in electrical resistivity from 3.5×10(-2) to 2.6×10(-3)Ωcm at 361K. Nonstoichiometric films prepared under less oxidized conditions did not exhibit the transition. The nonstoichiometry of the Ti(2)O(3)films was discussed in terms of excess Ti ions. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1992-03-28 |
| Volume | volume26 |
| Issue | issue2 |
| Start Page | 69 |
| End Page | 75 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307639 |
| JaLCDOI | 10.18926/15425 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_26_2_1.pdf |
| Author | Inaba, Hideo| Otake, Hideo| Nozu, Shigeru| |
| Abstract | Radiative characteristics of the frost layer melted by radiative heat are experimentally examined. A frost layer is heated from above by the radiative heat from a halogen lamp set. Thermal radiation of the lamp has the wavelength spectrum characteristics similar to those of the solar radiation. The effect of the environmental temperature upon the frost melting process is clarified in experiments. The optical characteristics of reflectivity, absorptivity and transmissivity of the frost layer during the melting of the frost layer are measured using special measuring instruments. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1992-03-28 |
| Volume | volume26 |
| Issue | issue2 |
| Start Page | 1 |
| End Page | 16 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307428 |
| JaLCDOI | 10.18926/15416 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_26_1_43.pdf |
| Author | Bouzidi, Moncef| Koga, Ryuji| Wada, Osami| Kagawa, Naoki| Hai Xu| Kosaka, Megumi| Sano HIroya| |
| Abstract | A numerical technique called as "adjoint spectrum" has been proposed by the authors in a previous work. Two applications of it are presented here. It is demonstrated that by generalizing the aspect of adjoint spectrum it becomes possible to measure densities of mixed gases simultaneously. An experimental proof of this has been carried on and simultaneous measurement of densities of both methane and dinitrogen oxide was realized. On the other hand, it is also reported that frequency shifting of spectra, which is a cause of error in spectrometric measurements, can be corrected by exploiting the adjoint spectrum technique in connection with the Taylor expansion. Numerical examples showing the success of this method are reported as well. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1991-11-30 |
| Volume | volume26 |
| Issue | issue1 |
| Start Page | 43 |
| End Page | 49 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307796 |
| JaLCDOI | 10.18926/15414 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_26_1_27.pdf |
| Author | Tomita, Eiji| Nsunge Felix Chintu| Hamamoto, Yoshisuke| |
| Abstract | Distributions of hydrogen gas concentration in a suddenly started, single shot hydrogen gas jet issuing from a 1 mm diameter injector into still air were measured using laser interferometry method. This unsteady, turbulent free jet flow has also been calculated using the two-equation, high Reynolds number version of k-ε turbulence model and hybrid scheme for treating combined diffusion and convection in the SIMPLE algorithm. The injection pressure was 0.5 MPa for which predicted and measured temporal jet tip penetration distributions indicate that the jet discharged into still air at Mach 0.25. The level of agreement between present prediction and measurement is good in some regions and poor in others. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1991-11-30 |
| Volume | volume26 |
| Issue | issue1 |
| Start Page | 27 |
| End Page | 41 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307648 |
| JaLCDOI | 10.18926/15411 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_29_2_13.pdf |
| Author | Dwianto Gatot| Osaki, Hirokazu| Kajihara, Yasuhiro| |
| Abstract | We propose a method to design the supplying method of parts to an assembly line. Three types of supplying model (Serial, Parallel, and Mixed) are proposed based on the relation between the area of part and that of the transportation equipment. The part is supplied by the pallet on which the all parts of one product are arranged or by the lot of one part. AGV or conveyor are used to transport the pallet. The supplying model is evaluated from the total transportation cost calculated from the price of the transportation equipment and of land. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1995-03-27 |
| Volume | volume29 |
| Issue | issue2 |
| Start Page | 13 |
| End Page | 21 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307903 |
| JaLCDOI | 10.18926/15397 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_30_2_1.pdf |
| Author | Takemoto, Yoshito| Hida, Moritaka| Sakakibara, Akira| |
| Abstract | 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. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1996-03-29 |
| Volume | volume30 |
| Issue | issue2 |
| Start Page | 1 |
| End Page | 7 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307225 |
| JaLCDOI | 10.18926/15392 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_27_1_45.pdf |
| Author | Kagawa, Naoki| Wada, Osami| Hai, Xu| Koga, Ryuji| Sano, Hiroya| Inubushi, Kazuyuki| |
| Abstract | A prototype device based on the tunable diode laser absorption spectrometry was constructed and the atmospheric methane concentration near the terrain in a rice paddy field was measured. An open optical path of 50 m length was employed along with a PbSnTe diode laser. Diurnal change of methane density with 30 seconds temporal resolution was recorded associated with meteorological parameters. A feasibility was proven for a practical application for in situ study of atmospheric methane. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1992-11-25 |
| Volume | volume27 |
| Issue | issue1 |
| Start Page | 45 |
| End Page | 53 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307877 |
| JaLCDOI | 10.18926/15389 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_30_1_121.pdf |
| Author | Kuk Hun| Tanino, Tetsuzo| Tanaka, Masahiro| |
| Abstract | In this paper we provide some theoretical results on stability and sensitivity analysis in convex vector optimization. Given a family of parametrized vector optimization problems, the perturbation maps are defined as the set-valued map which associates to each parameter value the set of minimal points (properly minimal points, weakly minimal points) of the perturbed feasible set with respect to an ordering convex cone. Sufficient conditions for the upper and lower semicontinuity of the perturbations map are obtained. We also provide quantitative properties of the perturbation maps under some convexity assumptions. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1995-12-28 |
| Volume | volume30 |
| Issue | issue1 |
| Start Page | 121 |
| End Page | 131 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307414 |
| JaLCDOI | 10.18926/15386 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_30_1_111.pdf |
| Author | Ye Ju| Tanaka, Masahiro| Tanino, Tetsuzo| |
| Abstract | Mutation is one of the important operators in genetic algorithm. In traditional genetic algorithm, mutation is activated stochastically. In this way it is unknown and cannot be controlled for which individuals to be mutated. Therefore, it is unavoidable that some good individuals are destroyed by mutation and then the evolutionary efficiency of the genetic algorithm is dampened. Owing to this kind of destructivity of mutation, the operator of mutation has to be limited within a very small probability, and the potentiality of mutation is consequently limited. In this paper, we present an evolutionary chain-based mutation and a control strategy of reasonable competition, in which the heuristic information provided by the evaluation function is well utilized. This method avoids the blindness of stochastic mutation. The performance improved in this method is shown by two examples, a fuzzy modeling for the identification of a nonlinear function and a typical combinatorial optimization problem-the traveling salesman problem. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1995-12-28 |
| Volume | volume30 |
| Issue | issue1 |
| Start Page | 111 |
| End Page | 120 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307635 |
| JaLCDOI | 10.18926/15384 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_30_1_99.pdf |
| Author | Wang, Ming| Wada, Osami| Koga, Ryuji| |
| Abstract | A cylindric mirror was used, in place of a parabolic mirror, to collimate the crescent blue laser beam radiated from the Cerenkov SHG in channel waveguide configuration. The cylindric mirror radius is requested to be twice the focal length of the parabolic mirror. The focusing effect of the cylindric mirror in collimation can be compensated by slightly lifting the mirror in its normal direction. Under the condition that the mirror was declined by 5.56° and lifted by 25 μm, we got the collimated beam with divergence angle less than 1.3 mrad. In the focusing experiment, the collimated beam was focused with spotsize of 1.8 μm. The details on the analysis and experiment are reported. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1995-12-28 |
| Volume | volume30 |
| Issue | issue1 |
| Start Page | 99 |
| End Page | 110 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307418 |
| JaLCDOI | 10.18926/15371 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_35_163.pdf |
| Author | Uchiyama Hiromitsu| Miyazaki Satoshi| Osaki, Hirokazu| Kajihara, Yasuhiro| Munesawa, Yoshiomi| Matsuki Katsunori| |
| Abstract | We develop an assembly robot system for assembling the flexible belt-shaped subject. An image processing method is developed to recognize the belt-shaped subject. This method is able to determine the grasping point and grasping angle for piking up a subject by a multiple hands unit. CAD information is used to determine the grasping point. The multiple hands unit is developed, which is able to grasp all grasping points of a subject at a time. In addition, the image processing method is used to judge whether a subject is fastened accurately at right position or not during the assembly. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2001-03-27 |
| Volume | volume35 |
| Issue | issue1-2 |
| Start Page | 163 |
| End Page | 168 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307229 |
| JaLCDOI | 10.18926/15367 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_30_1_9.pdf |
| Author | Ding Ronggui| Osaki, Hirokazu| |
| Abstract | Decision Support Systems (DSS) have been taken as hopeful support tools for decision making for more than 20 years. There are a lot of literatures on DSS, but most of them are not so practical as the designers expected. This paper points out the crux of this situation and argues that the research on DSS should pay some more attention to the decision making activities before the model using stage. A method named "Problem Situation Decomposing Graph (PSDG)" is presented in this paper for helping the decision maker(DM) elicit the decision making problems. A PSDG is an acycle AND/OR logical directed graph, and which includes all the factors affecting the problem situation based on the DM's knowledge. The logical nodes and parameter determining methods in PSDG can reflect the DM's decision making style. This paper introduces some basic concepts of PSDG, discusses some of its characteristics, and proposes a logical adjacency matrix for PSDG representation and analysis. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1995-12-28 |
| Volume | volume30 |
| Issue | issue1 |
| Start Page | 9 |
| End Page | 17 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307826 |
| JaLCDOI | 10.18926/15362 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_35_97.pdf |
| Author | Yamasaki, Susumu| Kurose, Yoshinori| |
| Abstract | In this paper, we formulate a new integrity constraint in correlation with 3-valued stable models in an abduction framework based on general logic programs. Under the constraint, not every ground atom or its negation is a logical consequence of the theory and an expected abductive explanation, but some atom may be unspecified as a logical consequence by an adjustment. As a reflection of the integrity constraint with an adjustment, we augment an adjusting derivation to Eshghi and Kowalski abductive proof procedure, in which such an unspecified atom can be dealt with. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2001-03-27 |
| Volume | volume35 |
| Issue | issue1-2 |
| Start Page | 97 |
| End Page | 135 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307812 |
| JaLCDOI | 10.18926/15361 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_35_77.pdf |
| Author | Kishimoto Tokunari| Totsuji, Chieko| Tsuruta, Kenji| Totsuji, Hiroo| |
| Abstract | In order to perform the large-scale molecular dynamics simulation of the Yukawa system, a mathematical expression for molecular dynamics using the fast multipole method is described. The model simulations are also performed to test the performance of our implementation of the FMM. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2001-03-27 |
| Volume | volume35 |
| Issue | issue1-2 |
| Start Page | 77 |
| End Page | 95 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307940 |
| JaLCDOI | 10.18926/15360 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_34_27.pdf |
| Author | Wei, He| Koga, Ryuji| Iokibe, Kengo| Wada, Osami| Toyota, Yoshitaka| |
| Abstract | In spring of 1998, Asian dust was observed with a Mie LIDAR in Okayama University, which can measure depolarization ratio. Three events of intense Asian dust were occurred in the period and medially detailed structure of atmosphere was found after examining records. Asian dust was distinguished from water droplets and the possibility to study three dimensional dynamic structure of atmosphere were demonstrated. |
| Keywords | Mie lidar Asian dust (KOSA) depolarization ratio backscattering ratio range normalized |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2000-03-27 |
| Volume | volume34 |
| Issue | issue1-2 |
| Start Page | 27 |
| End Page | 37 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307539 |
| JaLCDOI | 10.18926/15359 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_34_19.pdf |
| Author | Okada, Akira| Uno, Yoshiyuki| Okajima, Isao| |
| Abstract | In EDM, the machining characteristics greatly depend on the energy distribution. Therefore, it is very important to clarify the energy distribution for understanding various phenomena in EDM. In this paper, the energy distribution in EDM with graphite electrode is investigated by measuring the temperatures of electrode and workpiece. Experimental analysis shows that the material removal rate depends on energy density while the electrode wear greatly depends on the adhesion of heat resolved carbon from machining fluid, and the energies distributed into electrode and workpiece are almost constant regardless of pulse duration. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2000-03-27 |
| Volume | volume34 |
| Issue | issue1-2 |
| Start Page | 19 |
| End Page | 26 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307707 |
| JaLCDOI | 10.18926/15358 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_35_63.pdf |
| Author | Shinomiya Shigeru| Totsuji, Chieko| Tsuruta, Kenji| Totsuji, Hiroo| |
| Abstract | We present a theoretical study of Si(1-x)Ge(x) alloys based on tight-binding molecular dynamics (TBMD) calculations. First, we introduce a new set of nonorthogonal tight-binding parameters for silicon and germanium based on the previous work by Menon and Subbaswamy [Phys. Rev. B 55, 9231 (1997); J. Phys: Condens. Matter 10, 10991 (1998)]. We then apply the method to structural analyses of Si(1-x)Ge(x) alloys. The equilibrium volume and atomic structure for a given x are obtained by the TBMD method. We also calculate the bulk modulus B, elastic constants C(11), C(12) and C(44) as a function of x. The results show that the moduli vary monotonically, but nonlinearly, between the values of Si crystal and Ge crystal. The validity of the results is also discussed. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2001-03-27 |
| Volume | volume35 |
| Issue | issue1-2 |
| Start Page | 63 |
| End Page | 75 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307673 |
