JaLCDOI | 10.18926/14069 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_42_104.pdf |

著者 | Donghui, MA| Torii, Tashiyuki| Shimizu, Kenichi| Matsuba, Akira| |

抄録 | As model specimens of surface film-bonded materials, pure copper films with a thickness of 100μm were bonded to the surface of steel base with epoxy resin, where the tensile residual stress was measured by an X-ray on the surface copper film. The distribution of initial electric resistance was measured on both copper film and base specimen by a direct current potential drop technique. As a result, there was a good agreement between the measured and theoretical values. From the fatigue testing results, it was shown that the measured electric resistance increased with the fatigue crack length on the copper film, which was almost equal to the theoretical value calculated for a central slit in a plate with finite width. This was probably because the fatigue crack was opened due to the tensile residual stress on the film even under unloading condition. In addition, the internal crack length during fatigue was examined by ultrasonic testing for the film-bonded specimen. As a result, there was a difference in the fatigue crack length between the surface copper film and the inner base. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2008-01 |

巻 | 42巻 |

号 | 1号 |

開始ページ | 104 |

終了ページ | 109 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308537 |

JaLCDOI | 10.18926/14096 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_40_1_1.pdf |

著者 | 馬 有理| 清水 憲一| 鳥居 太始之| |

抄録 | A testing for bent fatigue crack propagation under mixed-mode conditions was carried out using fatigue and annealed slant precracks with different slant angles, β ,defined as the angle between loading and precrack directions in a rectangular plate. As a result, bent fatigue crack from the fatigue precrack with β =45deg. propagated under mixed-mode conditions with mode II stress intensity factor (K(II))(est) evaluated from the discontinuous displacement measured along the crack. On the other hand, bent fatigue crack from the fatigue precrack with β =60deg. and from the annealed precracks with both slant angles of β =60deg. and β =45deg. propagated under the mode I behavior. This was because the compressive residual stress near the fatigue precrack caused contact to each other between the upper and the lower surfaces of the precrack with the smaller slant angle β . Furthermore, the fatigue crack propagation rates indicated almost the same relationship for all the data, using the mixed-mode effective stress intensity factor (K(M))(est), calculated from the discontinuous displacement measured along the bent fatigue crack. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2006-01 |

巻 | 40巻 |

号 | 1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 | 120002308402 |

JaLCDOI | 10.18926/17822 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_43_1.pdf |

著者 | Shimizu, Kenichi| Torii, Tashiyuki| Ishida, Koki| |

抄録 | Using a fatigue testing method by which fatigue cracks can be initiated and propagated in a film adhered to cover an elliptical through-hole in a base plate subjected to push-pull cyclic loads, annealed copper films with the thickness of 100μm and those reduced the thickness from the 100μm to 50μm by an electro-polishing were fatigued under a constant stress amplitude with a stress ratio of zero. The crystal rotation behavior with the fatigue crack propagation was investigated by measuring the crystal orientation around the fatigue crack initiated from the notch root before and after fatigue testing, using EBSD (Electron Back-scatter Diffraction) method. Then, the change of crystal orientation with fatigue testing was evaluated quantitatively from the misorientation between the crystal orientation matrix on the same point obtained before and after fatigue testing. As a result, the angle of the crystal rotation obtained from the region showing the high fatigue crack propagation rate was larger than that obtained from the region showing the low fatigue crack propagation rate for the film with the thickness of 100μm, while the fatigue crack propagated faster in the film with the thickness of 50μm than that with the thickness of 100μm regardless of the small crystal rotation angles with the fatigue testing for the film with the thickness of 50μm. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2009-01 |

巻 | 43巻 |

開始ページ | 1 |

終了ページ | 7 |

ISSN | 1349-6115 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308710 |

JaLCDOI | 10.18926/14058 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_42_44.pdf |

著者 | Ogawa Takafumi| 鶴田 健二| 東辻 千枝子| 東辻 浩夫| Hiroshi Iyetomi| |

抄録 | To analyze vibrational properties of Si crystal with a single charge-neutral vacancy, we perform large-scale simulations based on tight-binding molecular-dynamics method. Vibrational modes and frequencies are obtained by diagonalizing dynamical matrix within a harmonic approximation. Results indicate that there exist vibrational modes spatially localized around the vacancy and large frequency shifts associated with the localized modes contribute significantly to reduction of the vibrational free energy. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2008-01 |

巻 | 42巻 |

号 | 1号 |

開始ページ | 44 |

終了ページ | 47 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308412 |

JaLCDOI | 10.18926/14059 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_42_48.pdf |

著者 | 東辻 千枝子| Miyake Takashi| Nakanishi Kenta| 鶴田 健二| 東辻 浩夫| |

抄録 | Based on the mapping introduced by the classical-map hypernetted-chain (CHNC) method, classical numerical simulations, Monte Carlo and molecular dynamics, have been applied to the twodimensional electron fluid and the results are compared with those of quantum Monte Carlo simulations hitherto reported. It is shown that polarization properties of the ground state obtained by the diffusion Monte Carlo method are reproduced within the accuracy of quantum simulations by both of two mapping functions for the quantum temperature which have been proposed within the CHNC method. These results may serve as the basis of numerical simulations based on the CHNC method which are applicable to finite non-periodic systems like quantum dots and systems at finite temperatures. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2008-01 |

巻 | 42巻 |

号 | 1号 |

開始ページ | 48 |

終了ページ | 52 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308425 |

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 |

巻 | 42巻 |

号 | 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 | 10.18926/14119 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_40_1_31.pdf |

著者 | 小川 貴史| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |

抄録 | We analyze the melting of spherical Yukawa clusters by Monte Carlo simulations. Spherical clusters are expected to be found in dusty plasmas in an isotropic environment such as microgravity and serve as a model for classical clusters. We obtain the specific heat through fluctuations of the potential energy and identify its peak as the transition temperature. Melting temperatures are compared with those of bulk Yukawa systems and it is confirmed that the melting temperature increases and approaches the bulk value with the increase of the system size. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2006-01 |

巻 | 40巻 |

号 | 1号 |

開始ページ | 31 |

終了ページ | 35 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308329 |

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 |

巻 | 40巻 |

号 | 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 | 10.18926/14121 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_40_1_40.pdf |

著者 | 三宅 隆| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |

抄録 | The electron system of arbitrary degeneracy can be mapped onto a classical system where electrons of the same spin are assigned an additional interaction and the effect of degeneracy is taken into account through an imaginative temperature. We apply this method to electrons in quantum dots modeled as two-dimensional electron liquid confined in a finite domain by a harmonic potential. We analyze distribution functions by molecular dynamics instead of solving integral equations which are not so useful in the case without translational invariance. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2006-01 |

巻 | 40巻 |

号 | 1号 |

開始ページ | 40 |

終了ページ | 43 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308268 |

JaLCDOI | 10.18926/14150 |
---|---|

フルテキストURL | Mem_Fac_Eng_39_1_46.pdf |

著者 | 門野 恵典| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |

抄録 | We present a real-space, polynomial-expansion approach to electron dynamics in nanostructured semiconductors. The Chebyshev expansion method is employed for efficient calculation of timeevolution of single-electron wave function. Details of the formulation are described. The method is applied to the electron transport in nanostructured semiconductors such as Si nanowires. The mean-square displacement and diffusivity of electron in Si chains are obtained as functions of length of the chains. The results show clearly ballistic behavior of electron in the pure Si chain. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2005-01 |

巻 | 39巻 |

号 | 1号 |

開始ページ | 46 |

終了ページ | 51 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308231 |

JaLCDOI | 10.18926/14152 |
---|---|

フルテキストURL | Mem_Fac_Eng_39_1_52.pdf |

著者 | 金森 克也| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |

抄録 | Thermal behavior of Coulomb clusters in a three dimensional confining potential is investigated by molecular dynamics simulations for system sizes of 1,000 to 20,288 ions. The specific heat of the system of shell-structured 20,000 ions is peaked almost at the same temperature as the system of bcc-structured 20,288 ions with much sharper structure for the latter. The diffusion coefficient and the peak to valley ratio of the two-dimensional pair distribution function on the outermost shell are obtained both as a function of temperature. The rotational movement of each shell in the system of 104 ions is observed. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2005-01 |

巻 | 39巻 |

号 | 1号 |

開始ページ | 52 |

終了ページ | 55 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308445 |

JaLCDOI | 10.18926/15348 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_35_21.pdf |

著者 | S.kovalenko, Volodymyr| Uno, Yoshiyuki| Okamoto, Yasuhiro| Anyakin, M.| Lutay, A.| Shubul, Khaled Al.| |

抄録 | In electric power industry, there is a problem of achieving stable joint in different components using high productive and efficient technologies. One type of these components is packages of slices for magnetic circuit of electric motors, transformers etc., which need reliable means for their fixing. Laser welding is proposed to solve this problem as an alternative for existing technologies. The development of the laser welding process is presented based on process simulation, study of heat history and comparison with experimental results. Laser beam additional scanning technique is proposed to improve the quality and efficiency of the joining operation. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2001-03-27 |

巻 | 35巻 |

号 | 1-2号 |

開始ページ | 21 |

終了ページ | 28 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307424 |

JaLCDOI | 10.18926/15358 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_35_63.pdf |

著者 | Shinomiya Shigeru| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |

抄録 | 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. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2001-03-27 |

巻 | 35巻 |

号 | 1-2号 |

開始ページ | 63 |

終了ページ | 75 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307673 |

JaLCDOI | 10.18926/15361 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_35_77.pdf |

著者 | Kishimoto Tokunari| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |

抄録 | 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. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2001-03-27 |

巻 | 35巻 |

号 | 1-2号 |

開始ページ | 77 |

終了ページ | 95 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307940 |

JaLCDOI | 10.18926/15382 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_35_207.pdf |

著者 | 中西 透| Fujiwara Toru| |

抄録 | In the group signature scheme with a trusted party, a verifier can determine whether or not a signature is made by a member of the group, but cannot identify the member who signed the signature. In case of dispute later on, the signer can be identified by the trusted party. However, for efficient group signature schemes proposed so far, removing a member from the group can be not efficiently performed. In this paper, a group signature scheme with an easy membership canceling is proposed. By sending a request to use a resource together with the group signature on it to the manager of the resource, the manager can control anonymous accesses to the resource. In such an application, the proposed group signature scheme is suitable for canceling of the access privilege. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2001-03-27 |

巻 | 35巻 |

号 | 1-2号 |

開始ページ | 207 |

終了ページ | 212 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002307232 |

JaLCDOI | 10.18926/17826 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_43_8.pdf |

著者 | Umeda Ryosuke| 東辻 千枝子| 鶴田 健二| 東辻 浩夫| |

抄録 | Metamaterial which has negative permittivity and permeability is investigated via computer simulations. Effects of the nanostructure on dielectric and magnetic properties of the material are taken into account by introducing the Drude-Lorentz model in the materials dispersion. We include multi-band process in the dielectric response in order to reproduce accurately experimental values of bulk Au thin film. Size effect on the dispersion is examined by comparing the model with that of a noble metal particle. Based on the dispersion model constructed, we analyze the electromagnetic response of nanostructured metamaterials to evanescent waves at microwave and optical frequencies via finite-difference time-domain simulatioins on parallel computer. A re- focusing and an amplification of the evanescent waves propagating through a metamaterial, consisting of metal slab/vacuum stacking, is demonstrated for the frequencies of 30GHz and 744THz. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2009-01 |

巻 | 43巻 |

開始ページ | 8 |

終了ページ | 15 |

ISSN | 1349-6115 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308833 |

JaLCDOI | 10.18926/17829 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_43_16.pdf |

著者 | Kurose Tomoyuki| 鶴田 健二| 東辻 千枝子| 東辻 浩夫| |

抄録 | The finite-difference time-domain (FDTD) method has been applied to the calculation of the phonon band structure of two-dimensional (2D) phononic crystals, consisting of metal cylinders placed periodically in liquid. By comparing several combinations of materials for metal cylinder and liquid, we analyze the dependence of the band structures on sound speed and density of liquid media. Moreover, the negative refraction of the acoustic waves is observed at the interfaces between phononic crystal slab and the liquid. We find that an acoustic“lens effect”with the slab appears due to the negative refractions. The relationship between the focal intensity in the lens effect and the band structure is discussed. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2009-01 |

巻 | 43巻 |

開始ページ | 16 |

終了ページ | 21 |

ISSN | 1349-6115 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308928 |

JaLCDOI | 10.18926/17831 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_43_22.pdf |

著者 | 東辻 浩夫| Chai Hong| 東辻 千枝子| 鶴田 健二| |

抄録 | For the transfer of quantum information and the creation of entangled states, the application of tuned spin chains, systems of spins with the nearest-neighbor coupling tuned so as to give high efficiency, has been proposed and some examples of high performance have been given by several authors. In this article, the effect of deviations from tuned values and the effect of resultant asymmetry are investigated through numerical simulations and theoretical analyses. It is shown that there exists a system where the transfer efficiency is comparable with exactly tuned ones and, at the same time, robust to noises in the coupling constants. It is also shown that the effect of asymmetry on the efficiency of entanglement creation is of the second order when the asymmetry is small. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 2009-01 |

巻 | 43巻 |

開始ページ | 22 |

終了ページ | 26 |

ISSN | 1349-6115 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002308966 |

JaLCDOI | 10.18926/19671 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_33_2_51.pdf |

著者 | 東辻 浩夫| 鶴田 健二| 東辻 千枝子| |

抄録 | Density functional molecular dynamics method is applied to hydrogen plasma in the domain of liquid metallic hydrogen. Tentative results for the proton-proton pair distribution function and the electron-proton pair distribution function are obtained. It is shown that with the increase of the parameter γ(s), we have increasingly strong screening of proton charge by electrons and the decrease of electron density in the domain between protons. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 1999-04-27 |

巻 | 33巻 |

号 | 2号 |

開始ページ | 51 |

終了ページ | 59 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002309192 |

JaLCDOI | 10.18926/19673 |
---|---|

フルテキストURL | Mem_Fac_Eng_OU_33_2_61.pdf |

著者 | 東辻 浩夫| 鶴田 健二| 東辻 千枝子| |

抄録 | The behavior of multicomponent plasmas in the Penning-Malmberg traps is discussed with the parameters corresponding to experiments with antiprotons and cryogenic electrons. The relaxation times for the energy transfer antiprotons to electrons and between parallel and perpendicular components of electrons are estimated. It is shown that, depending on the values of parameters, both the former and the latter can be the bottleneck in the cooling process. |

出版物タイトル | Memoirs of the Faculty of Engineering, Okayama University |

発行日 | 1999-04-27 |

巻 | 33巻 |

号 | 2号 |

開始ページ | 61 |

終了ページ | 69 |

ISSN | 0475-0071 |

言語 | English |

論文のバージョン | publisher |

NAID | 120002309106 |