JaLCDOI 10.18926/46975
フルテキストURL mfe_37_2_001_004.pdf
著者 Sakakibara, Akira| Kanadani, Teruto|
抄録 Effect of addition of Fe on the occurrence of serration in Al-12mass%Zn alloys was investigated. Specimens aged at 293K for various periods after quenching from various temperatures (T(Q)), 398K to 823K, were tensile-tested at room temperature. Serration occurred more easily and more remarkably with decreasing T(Q) for as-quenched specimens: in the case that T(Q)=448K serration was observed both for the binary and Fe added alloys, while in the case that T(Q)=573K none of the three alloys showed serration. For the binary alloy serration was observed only when the aging period was short enough, but addition of Fe to the binary alloy prolonged the aging period where serration could be recognized. Aging rate measured by hardness was remarkably retarded with the increase of Fe addition. These results confirm the interpretation that the serration in Al-Zn alloy occurs in the early stage of aging where small GP zones or solute clusters are formed.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2003-03
37巻
2号
開始ページ 1
終了ページ 4
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 80016019142
JaLCDOI 10.18926/19648
フルテキストURL Mem_Fac_Eng_OU_33_2_1.pdf
著者 Omura, Yasuhiro| 飛田 守孝| 榊原 精| 竹元 嘉利|
抄録 Molecular dynamics simulation of nickel crystal under uniaxial tensile and compressive deformation was performed for single nenocrystal model and twinned nanocrystal model composed of 1550 atoms using EAM (embedded atom method) potential with the object of investigating deformation induced phase tranformation (especially twin deformation). In the case of single nanocrystal model, the evolution and development of twin deformation, (111)[11(2)], is observed under compressive loading in [001] direction, whereas either slip or twin deformation is not recognized under tensile loading. In the case of twinned nanocrystal model, twin, (111)[11(2)], decreases and disappears under tensile loading, and develops under compressive loading, It is suggested from the difference of results between single nanocrystal model and twinned nanocrystal model that it is easy for twin to induce local deformation.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1999-04-27
33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 120002309020
JaLCDOI 10.18926/15406
フルテキストURL Mem_Fac_Eng_OU_27_2_59.pdf
著者 Prokop Jiri| Myojin Sho|
抄録 The paper presents methods for simulation and examination of the performance of a classification yard, including both manual and computer-aided methods. Presented methods are applicable to the simulation and examination of full range of yards of different types and sizes including manually operated as well as highly automated classification yards.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1993-03-25
27巻
2号
開始ページ 59
終了ページ 71
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307384
JaLCDOI 10.18926/14082
フルテキストURL Mem_Fac_Eng_OU_41_1_31.pdf
著者 濱名 良平| 小西 正躬| 今井 純|
抄録 Various kind of productions are made in semiconductor factories, where it employs the production system with multiprocess and multiple Automated Guided Vehicles(AGVs) for transportation. It is difficult to optimize planning of production and transportation simultaneously because of the complicated flow of semifinished products. This paper describes the formulations of production scheduling and transportation routing, and algorithm for simultaneous optimization of plannings by using logic cuts. The entire problem is decomposed to the master problem and the sub problem. If it derives the infeasible solutions, new constraints are added to the master problem to eliminate the solution area including infeasible solutions. The results of about optimality and computation time by using CPLEX solver are shown compared with conventional decomposition method to check up effectivity of proposed method in small size problem, and about optimality and computaion time for large scale problem.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2007-01
41巻
1号
開始ページ 31
終了ページ 43
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308108
JaLCDOI 10.18926/19657
フルテキストURL Mem_Fac_Eng_OU_33_2_19.pdf
著者 山本 恭二| Jiao Xuecheng| Jiao Xuezhen|
抄録 A new type of hydrocyclone with a perforated inner cylinder is tested experimentally to study its performance for liquid-solid separation. The size of the cyclone is small so that it may be effective for small particle separation. Two types of the inner cylinder were made : the one has 39.5% void fraction of the perforated surface and the other has 73.5% . The mean particle diameter is 4.5 μ m. It is found that the pressure loss of the cyclone with the inner cylinder is reduced by about 25% compared with that of the ordinary type. The new type cyclone has better separation efficiency.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1999-04-27
33巻
2号
開始ページ 19
終了ページ 24
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002309091
JaLCDOI 10.18926/19622
フルテキストURL Mem_Fac_Eng_OU_31_1_5.pdf
著者 島村 薫| Zhang Chunxiao| 内田 哲也|
抄録 Rigid polymer poly(p-phenylene benzobisthiazole) was crystallized from dilute solution. Electron microscopy showed that upon quenching, flat fibrils with several nm thick were produced. Subsequent heat treatment in solvent changed the fibril into "shish-kebab". On the other hand, by isothermal crystallization, an aggregate of parallel rod-like crystals was obtained. The molecular chains were accommodated normal to the rod. Based on the observation of crystal morphology, the isothermal crystallization mechanism was proposed. Because of regidity of polymer chains and wide distribution of the molecular length, the chain ends were inevitably included within the crystals resulting in crystal defects such as axial shift, lattice curvature and edge dislocation which were directly observed by lattice imaging.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1996-12-27
31巻
1号
開始ページ 5
終了ページ 10
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002309167
JaLCDOI 10.18926/15444
フルテキストURL Mem_Fac_Eng_OU_26_2_129.pdf
著者 東辻 浩夫|
抄録 The spectrum of Schottky noise in ion storage rings is analyzed as density fluctuations in effectively one-dimensional plasmas. Strong coupling effects in these plasmas are discussed in relation to experimental observations.
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 129
終了ページ 138
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307668
JaLCDOI 10.18926/14061
フルテキストURL Mem_Fac_Eng_OU_42_56.pdf
著者 Miyake Takashi| 東辻 千枝子| Nakanishi Kenta| 鶴田 健二| 東辻 浩夫|
抄録 We analyze the ground state of the two-dimensional quantum system of electrons confined in a parabolic potential with the system size around 100. We map the system onto a classical system on the basis of the classical-map hypernetted-chain (CHNC) method which has been proven to work in the integral-equation-based analyses of uniform unbounded systems and then apply classical numerical simulations. We find that the confined system undergoes the transition to the spin polarized state with the decrease of the average density and the corresponding critical value is as low as rs ∼ 0.3 in terms of the usual rs parameter estimated for the average density. As the ground state for given value of the rs parameter, our data give the critical value for the transition around 20 which is consistent with the known possibility. The advantage of our method is a direct applicability to geometrically complex systems which are difficult to analyze by integral equations. The application to the structure like quantum dots reported here is the first example of such applications.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2008-01
42巻
1号
開始ページ 56
終了ページ 59
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308633
JaLCDOI 10.18926/44500
フルテキストURL mfe_045_054_059.pdf
著者 Nekado, Kenta| Takai, Yusuke| Nogami, Yasuyuki| Morikawa, Yoshitaka|
抄録 Recently, pairing–based cryptographies have attracted much attention. For fast pairing calculation, not only pairing algorithms but also arithmetic operations in extension field should be efficient. Especially for final exponentiation included in pairing calculation, squaring is more important than multiplication. This paper considers squaring algorithms efficient for cubic extension field which is often used for pairing implementaions.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2011-01
45巻
開始ページ 54
終了ページ 59
ISSN 1349-6115
言語 English
著作権者 Copyright © by the authors
論文のバージョン publisher
NAID 80021759252
JaLCDOI 10.18926/15389
フルテキストURL Mem_Fac_Eng_OU_30_1_121.pdf
著者 Kuk Hun| 谷野 哲三| 田中 雅博|
抄録 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.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1995-12-28
30巻
1号
開始ページ 121
終了ページ 131
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307414
JaLCDOI 10.18926/14097
フルテキストURL Mem_Fac_Eng_OU_40_1_9.pdf
著者 貫名 高史| 小西 正躬| 西 竜志| 今井 純|
抄録 Controls of the temperature, pressure and flowing quantity are important for the stable operation of the product quality in the distillation tower. The usual measuring way of product quality estimation is made by the off-line analysis. In this paper, online estimation method of product quality is studied for improving the product quality. The estimation method based on stochastic analysis was developed for online estimation. In this paper, the data of temperature, pressure and flow volum in the distillation tower are treated. As the estimation models, RNN (Recurrent Neural Net Work) and PLS (Partial Least Square Regression Method) were adopted. The actual plant data were used in the analysis. Both PLS and RNN models could compensate each other to improve the accuracy in estimation.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2006-01
40巻
1号
開始ページ 9
終了ページ 15
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308095
JaLCDOI 10.18926/14087
フルテキストURL Mem_Fac_Eng_OU_41_1_73.pdf
著者 金谷 健一|
抄録 A rigorous accuracy analysis is given to various techniques for estimating parameters of geometric models from noisy data for computer vision applications. First, it is pointed out that parameter estimation for vision applications is very different in nature from traditional statistical analysis and hence a different mathematical framework is necessary in such a domain. After general theories on estimation and accuracy are given, typical existing techniques are selected, and their accuracy is evaluated up to higher order terms. This leads to a “hyperaccurate” method that outperforms existing methods.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2007-01
41巻
1号
開始ページ 73
終了ページ 92
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308410
JaLCDOI 10.18926/14120
フルテキストURL Mem_Fac_Eng_OU_40_1_36.pdf
著者 内田 厚| 東辻 千枝子| 鶴田 健二| 東辻 浩夫|
抄録 We present a Stochastic-Difference-Equation (SDE) approach to long time-scale molecular dynamics (MD) simulations, which are required for nanosecond-scale phenomena. In this method, the MD trajectory in a fixed time period is obtained as a stationary solution of an action functional based on an error accumulation of the equation of motion along the path, thus reducing the problem to a boundary-value problem, instead of an initial-value problem in the ordinary MD method. We apply the method to formation processes of Cu thin film via nanocluster deposition onto a substrate. The applicability of the SDE algorithm to the problem and the effects of the choice of SDE parameters on the optimization processes of configuration pathway are examined.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2006-01
40巻
1号
開始ページ 36
終了ページ 39
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308517
JaLCDOI 10.18926/14053
フルテキストURL Mem_Fac_Eng_OU_42_1.pdf
著者 Asatani Jun| 甲本 卓也| Toru Fujiwara| Tadao Kasami|
抄録 Two typical examples, the (32, 21, 6) and (64, 45, 8) extended code of primitive permuted BCH codes, are considered. The sets of minimum weight codewords are analyzed in terms of Boolean polynomial representation. They are classied by using their split weight structure with respect to the left and right half trellis sections, and for each class, the standard form is presented. Based on the results, we can generate a proper list of the minimum weight codewords of the codes.
キーワード Boolean polynomial representation extended BCH codes minimum weight codewords binary shift invariance property
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2008-01
42巻
1号
開始ページ 1
終了ページ 9
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308333
JaLCDOI 10.18926/47000
フルテキストURL mfe_36_1_051_057.pdf
著者 Vaillancourt, Chico|
抄録 This is a brief essay on using kinesthetic approaches to learning English as a second language. In the essay, I briefly discuss teaching philosophy and 2 small-scale Technical Engineering projects that I have introduced and completed with my 4(th) year engineering students in the spring of 2001.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2001-12
36巻
1号
開始ページ 51
終了ページ 57
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120003497026
JaLCDOI 10.18926/46999
フルテキストURL mfe_36_1_041_049.pdf
著者 Totsuji, Hiroo| Kishimoto, Tokunari| Totsuji, Chieko| Tsuruta, Kenji|
抄録 The ground state of spherical clusters of charged particles of one species confined by the three-dimensional parabolic potential is investigated by molecular dynamics simulations with the system size from N = 5000 to N = 1.2 × 10(5) . The cohesive energy per particle is compared between the shell-structured clusters and spherical finite bcc lattices with relaxed surfaces, the former and the latter being the ground states for small systems and for the large enough systems, respectively. It is shown that, when N > N(c)(N(c) > N), finite bcc lattices with relaxed surfaces (the shell structures) have stronger cohesion than the shell structures (finite bcc lattices with relaxed surfaces) and the critical value of the transition N(c) is estimated to be 10(4) < N(c) < 1.4 × 10(4) . The nucleation of the bcc lattice in the shell-structured cluster of 2 × 10(4) ions is observed.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2001-12
36巻
1号
開始ページ 41
終了ページ 49
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 80015112663
JaLCDOI 10.18926/15166
フルテキストURL Mem_Fac_Eng_OU_31_1_19.pdf
著者 東辻 浩夫| 岸本 篤也| 東辻 千枝子|
抄録 As a model of dusty plasmas in external fields, Yuka.wa system in a one-dimensional external field is analyzed by molecular dynamics simulations and theoretical approaches. It is shown that particles form clear thin layers (sheets) at low temperatures and the number of layers changes discretely with characteristic parameters of the system, accompanying the rearrangements of whole system from nearly equipartitioned layers to also nearly equipartitioned layers. The number, positions and populations of layers are obtained as functions of characteristic parameters. The shell (sheet) model which has been successful for confined one-component plasmas is extended to this system and results of numerical experiments are reproduced to a good accuracy. The effect of cohesive energy in each layer is of essential importance to reproduce discrete changes in the number of sheets.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1996-12-27
31巻
1号
開始ページ 19
終了ページ 33
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002307616
JaLCDOI 10.18926/46949
フルテキストURL mfe_38_1-2_029_032.pdf
著者 Totsuji, Hiroo| Totsuji, Chieko| Ogawa, Takafumi| Tsuruta, Kenji|
抄録 The structure of dust particles in dusty plasmas under microgravity has been analyzed by molecular dynamics simulation. The charge neutrality condition satisfied by the system composed of dust particles and ambient plasma is properly taken into account. It is shown that dust particles form shell structures at low temperatures and the number of shells are obtained as a phase diagram in the plane of two parameters characterizing the system: the number of particles and the strength of screening. It is also shown that these structures are almost independent of the strength of screening.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2004-03
38巻
1-2号
開始ページ 29
終了ページ 32
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 80016863328
JaLCDOI 10.18926/19636
フルテキストURL Mem_Fac_Eng_OU_32_23.pdf
著者 東辻 浩夫| 岸本 篤也| 東辻 千枝子|
抄録 Parameters characterizing the structure ot confined Yukawa system are estimated for 'dusty plasmas', clouds of charged macroscopic particles formed near the boundary between plasma and the sheath and leviated by negatively biased electrode. When we have dust particles with different ratios of charge to mass, they form a two-dimensional Yukawa mixture or separate two-dimensional one-companent Yukawa systems, depending on the charge density in the sheath and number density of dust particles. In order to provide a basis for numerical simulations on Yukawa mixtures including Coulombic case, we summarize mathematical expressions necessary for molecular dynamics.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1998-04-20
32巻
1-2号
開始ページ 23
終了ページ 41
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002309150
JaLCDOI 10.18926/14088
フルテキストURL Mem_Fac_Eng_OU_41_1_93.pdf
著者 Tarequl Islam Bhuiyan| 中西 真| 藤井 達生| 高田 潤|
抄録 Co-precipitation method has been employed to fabricate neodymium substituted hematite with different compositions from the aqueous solution of their corresponding metal salts. Thermal analysis and X-ray diffraction studies revealed the coexistence of Fe(2)O(3) and Nd(2)O(3) phases up to 1050℃ and formation of solid solution phase among them at 1100℃ and above temperatures, which was evidenced by shifting of the XRD peaks. Unit cell parameters and the cell volumes of the samples were found to increase by adding Nd(3+) ions in the reaction process. FESEM studies showed the suppression of particle growth due to the presence of Nd(3+) ions. Spectroscopic measurement evidenced that neodymium substituted hematite exhibited brighter yellowish red color tone than that of pure α-Fe(2)O(3).
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2007-01
41巻
1号
開始ページ 93
終了ページ 98
ISSN 0475-0071
言語 English
論文のバージョン publisher
NAID 120002308163