著者

Afendi Mohd Abdul Majid M.S. Daud Ruslizam Abdul Rahman A. Teramoto Tokuo

出版者

Elsevier Ltd.

雑誌

International journal of adhesion and adhesives (ISSN:01437496)

巻号頁・発行日

vol.45, pp.21-31, 2013-09

被引用文献数

22 2

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This paper deals with strength and failure prediction as well as reliability issues of adhesive joints of brittle epoxy bonding of two dissimilar adherends. Effects of bond thickness and scarf angle upon the strength of such joints are also addressed. Three kinds of adhesive joints, i.e., butt, scarf and shear joints, are considered. It is found that the strength prediction of various adhesive joints under consideration can be done by establishing interface corner toughness, Hc, parameter. For adhesive joints with an interfacial crack, fracture toughness, Jc, or interfacial toughness, Kc, can be used as a fracture criterion depending on the fracture type observed. The predicted strengths based on these fracture criteria (i.e., Hc, Jc and Kc) are in good agreement with experimental data obtained. Weibull modulus is a suitable parameter to define the strength reliability of adhesive joints. From experimental data, scarf joint of 45° is identified to be preferable since it satisfies both outstanding load-bearing performance and tolerable reliability. In addition, the Weibull statistical method has made possible the strength reliability determination of non-cracked adhesive joints.

著者

Asai Hidehiro Tachiki Masashi Kadowaki Kazuo

出版者

Elsevier

雑誌

Physica. C, Superconductivity and its applications (ISSN:09214534)

巻号頁・発行日

vol.491, pp.35-39, 2013-08

被引用文献数

2 1

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In this study, we investigate numerically the terahertz radiation from the mesa-structured intrinsic Josephson junctions (IJJs). The Sine–Gordon equation for inside of the mesa, and the Maxwell equation for outside of the mesa, are solved simultaneously. We consider the influence of a hot spot in the mesa where jc locally decreases, and calculate the radiation power as a function of the voltage. We observe strong radiation when the ac Josephson frequency satisfies the cavity resonance condition. For this strong radiation from the IJJs mesa, we calculate the radiation patterns. The radiation patterns reflect the existence of two types of internal modes: a uniform background mode and a cavity resonance mode. Furthermore, the radiation patterns are strongly affected by the diffraction at substrate edges.

著者

Klemm Richard A. Delfanazari Kaveh Tsujimoto Manabu Kashiwagi Takanari Kitamura Takeo Yamamoto Takashi Sawamura Masashi Ishida Kazuya Hattori Toshiaki Kadowaki Kazuo

出版者

Elsevier

雑誌

Physica. C, Superconductivity and its applications (ISSN:09214534)

巻号頁・発行日

vol.491, pp.30-34, 2013-08

被引用文献数

19 3

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In order to understand the radiation observed from the intrinsic Josephson junctions in triangular Bi2Sr2CaCu2O8+δ mesas, we calculate the transverse magnetic (TM) electromagnetic modes for thin equilateral cavities. A new set of distinct but degenerate TM modes coexists with the known modes of Helszajn and James, but are expected to lead to distinct radiation angular distribution patterns. Although we have been unable to solve for the exact TM modes of a thin cavity of general acute isosceles triangular shape, we solved exactly the closely related problems of the TM cavity modes of two thin circumscribing “pie-shaped” wedges, which provide highly accurate approximations to very acute isosceles triangular cavities.

著者

Akiyama Shigeki Zaimi Toufik

出版者

SP Versita

雑誌

Central European Journal of mathematics (ISSN:18951074)

巻号頁・発行日

vol.11, no.9, pp.1616-1627, 2013-09

被引用文献数

2 2

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A complex number α is said to satisfy the height reducing property if there is a finite subset, say F, of the ring ℤ of the rational integers such that ℤ[α] = F[α]. This property has been considered by several authors, especially in contexts related to self affine tilings and expansions of real numbers in non-integer bases. We prove that a number satisfying the height reducing property, is an algebraic number whose conjugates, over the field of the rationals, are all of modulus one, or all of modulus greater than one. Expecting the converse of the last statement is true, we show some theoretical and experimental results, which support this conjecture.

著者

Gaitan P. Isozaki H. Poisson O. Siltanen S. Tamminen J. P.

出版者

Society for Industrial and Applied Mathematics

雑誌

SIAM journal on mathematical analysis (ISSN:00361410)

巻号頁・発行日

vol.45, no.3, pp.1675-1690, 2013-05

被引用文献数

5

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We consider an inverse boundary value problem for the heat equation on the interval $(0,1)$, where the heat conductivity $\gamma(t,x)$ is piecewise constant and the point of discontinuity depends on time: $\gamma(t,x) = k^2 \ (0 < x < s(t))$, $\gamma(t,x) = 1\ (s(t) < x < 1)$. First, we show that $k$ and $s(t)$ on the time interval $[0,T]$ are determined from a partial Dirichlet-to-Neumann map: $u(t,1) \to \partial_xu(t,1), \ 0 < t < T$, $u(t,x)$ being the solution to the heat equation such that $u(t,0)=0$, independently of the initial data $u(0,x)$. Second, we show that another partial Dirichlet-to-Neumann map: $u(t,0) \to \partial_xu(t,1), \ 0 < t < T$, $u(t,x)$ being the solution to the heat equation such that $u(t,1)=0$, restricts the pair $(k,s(t))$ to, at most, two cases on the time interval $[0,T]$, independently of the initial data $u(0,x)$.

著者

Afendi Mohd Teramoto Tokuo Bakri Hairul Bin

出版者

Elsevier Ltd.

雑誌

International journal of adhesion and adhesives (ISSN:01437496)

巻号頁・発行日

vol.31, no.6, pp.402-411, 2011-09

被引用文献数

68 16

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In this study, strength of epoxy adhesively bonded scarf joints of dissimilar adherends, namely SUS304 stainless steel and YH75 aluminum alloy is examined on several scarf angles and various bond thicknesses under uniaxial tensile loading. Scarf angle, θ=45°, 60° and 75° are employed. The bond thickness, t between the dissimilar adherends is controlled to be ranged between 0.1 and 1.2 mm. Finite element (FE) analysis is also executed to investigate the stress distributions in the adhesive layer of scarf joints by ANSYS 11 code. As a result, the apparent Young's modulus of adhesive layer in scarf joints is found to be 1.5–5 times higher than those of bulk epoxy adhesive, which has been obtained from tensile tests. For scarf joint strength prediction, the existing failure criteria (i.e. maximum principal stress and Mises equivalent stress) cannot satisfactorily estimate the present experimental results. Though the measured stress multiaxiality of scarf joints proportionally increases as the scarf angle increases, the experimental results do not agree with the theoretical values. From analytical solutions, stress singularity exists most pronouncedly at the steel/adhesive interface corner of joint having 45–75° scarf angle. The failure surface observations confirm that the failure has always initiated at this apex. This is also in agreement with stress-y distribution obtained within FE analysis. Finally, the strength of scarf joints bonded with brittle adhesive can be best predicted by interface corner toughness, Hc parameter.

著者

清家 竜介

出版者

[出版者不明]

巻号頁・発行日

2010-07

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制度:新 ; 報告番号:甲3167号 ; 学位の種類:博士(学術) ; 授与年月日:2010/7/15 ; 早大学位記番号:新5456

著者

出村 裕英

出版者

物性研究刊行会

雑誌

物性研究 (ISSN:08272997)

巻号頁・発行日

vol.82, no.3, pp.435-440, 2004-06-20

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この論文は国立情報学研究所の電子図書館事業により電子化されました。

著者

Benseman T. M. Gray K. E. Koshelev A. E. Kwok W.-K. Welp U. Minami H. Kadowaki K. Yamamoto T.

出版者

American Institute of Physics

雑誌

Applied physics letters (ISSN:00036951)

巻号頁・発行日

vol.103, no.02, pp.022602, 2013-07

被引用文献数

107 8

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Stacks of intrinsic Josephson junctions in high-temperature superconductors enable the fabrication of compact sources of coherent terahertz radiation. Here, we demonstrate that multiple stacks patterned on the same Bi2Sr2CaCu2O8+δ crystal can—under optimized conditions—be synchronized to emit high-power THz-radiation. For three synchronized stacks, we achieved 610 μW of continuous-wave coherent radiation power at 0.51 THz. We suggest that synchronization is promoted by THz-waves in the base crystal. We note that synchronization cannot be achieved in all samples. However even in these cases, powers on the 100-μW scale can be generated.

著者

Liu Chunguang Shi Wansheng Kim Mijung Yang Yingnan Lei Zhongfang Zhang Zhenya

出版者

Elsevier Ltd.

雑誌

International journal of hydrogen energy (ISSN:03603199)

巻号頁・発行日

vol.38, no.18, pp.7246-7252, 2013-06

被引用文献数

22

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Photocatalytic pretreatment of waste activated sludge (WAS) using a flat photocatalytic reactor was undertaken. Photocatalytic pretreatment enhanced the release of soluble substances from WAS, in which the soluble protein and soluble carbohydrate concentration increased by about 50% and 80%, respectively. Significant removal of heavy metal ions from the liquid phase of WAS was also achieved after photocatalytic pretreatment. In addition, the highest hydrogen yield and the highest concentration of volatile fatty acids (VFAs) were achieved from the photocatalysis pretreated WAS by batch anaerobic digestion (55 °C). The cumulative hydrogen yield from photocatalysis pretreated WAS was 211.0 ml/l-sludge, much higher than those from UV pretreated WAS (111.0 ml/l-sludge) and from raw WAS (93.0 ml/l-sludge). The results indicate that photocatalysis is a promising WAS pretreatment method for the enhancement of biohydrogen production, probably due to the photo-oxidation of organics and simultaneous photo-reduction of heavy metal ions in WAS.

著者

Ito Hiroshi Maeda Tetsuhiko Nakano Akihiro Hwang Chul Min Ishida Masayoshi Kato Atsushi Yoshida Tetsuya

出版者

Elsevier Ltd.

雑誌

International journal of hydrogen energy (ISSN:03603199)

巻号頁・発行日

vol.37, no.9, pp.7418-7428, 2012-05

被引用文献数

132 11

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Experimentalstudy on proton exchange membrane (PEM) electrolyzer was carried out focusing on the effect of pore structural properties of currentcollectors, such as porosity and pore diameter. Various titanium (Ti)-felt substrates with different porosities and pore diameters (measured by capillary flow porometry) were used as the anode currentcollector. Results show that when the mean pore diameter of the currentcollector was larger than 10 μm, the electrolysis performance improved with decreasing pore diameter. In contrast, changes in porosity had no significant effect on the cell performance when the porosity exceeded 0.50. The flow pattern of two-phase flow in the flow channel was discussed in terms of its relationship to bubble size and to pore diameter of the currentcollector. Finally, correlation between the calculated membrane resistance and the measured pore diameter of the currentcollectors suggest that larger bubbles generated from larger pores tend to become long bubbles in the channel, thus hindering the water supply to the membrane.

著者

辻 加代子 金 美貞 ツジ カヨコ Tsuji Kayoko Kim Mijeong

出版者

大阪大学大学院文学研究科日本語学講座

雑誌

阪大日本語研究 (ISSN:09162135)

巻号頁・発行日

vol.21, pp.183-198, 2009-02

著者

科学技術政策研究所 科学技術動向研究センター

出版者

科学技術政策研究所 科学技術動向研究センター

巻号頁・発行日

2010-12 (Released:2012-03-14)

著者

Kuwayama Hidekazu Ishida Shuji

出版者

Nature Publishing Group

雑誌

Scientific reports (ISSN:20452322)

巻号頁・発行日

vol.3, pp.2272, 2013-07

被引用文献数

49

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Solitons have been observed in various physical phenomena. Here, we show that the distinct characteristics of solitons are present in the mass cell movement of non-chemotactic mutants of the cellular slime mould Dictyostelium discoideum. During starvation, D. discoideum forms multicellular structures that differentiate into spore or stalk cells and, eventually, a fruiting body. Non-chemotactic mutant cells do not form multicellular structures; however, they do undergo mass cell movement in the form of a pulsatile soliton-like structure (SLS). We also found that SLS induction is mediated by adhesive cell-cell interactions. These observations provide novel insights into the mechanisms of biological solitons in multicellular movement.

著者

Komatsu Tetsuro Sekiya Takeshi Nagata Kyosuke

出版者

Nature Publishing Group

雑誌

Scientific reports (ISSN:20452322)

巻号頁・発行日

vol.3, pp.2187, 2013-07

被引用文献数

14

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The expression of adenovirus late genes is shown to require viral DNA replication, but its mechanism remains elusive. Here we found that knockdown of CTCF suppresses viral DNA replication as well as late, but not early, gene expression. Chromatin immunoprecipitation assays indicated that CTCF binds to viral chromatin depending on viral DNA replication. These findings depict CTCF as a critical regulator for adenovirus genome functions in late phases of infection.

著者

犬井 善壽

出版者

筑波大学平家部会

雑誌

筑波大学平家部会論集

巻号頁・発行日

vol.4, pp.52-56, 1994-07-25

著者

崔 忠煕

出版者

筑波大学平家部会

雑誌

筑波大学平家部会論集

巻号頁・発行日

vol.4, pp.38-51, 1994-07-25

著者

小井土 守敏

出版者

筑波大学平家部会

雑誌

筑波大学平家部会論集

巻号頁・発行日

vol.4, pp.29-37, 1994-07-25

著者

李 鮮瑛

出版者

筑波大学平家部会

雑誌

筑波大学平家部会論集

巻号頁・発行日

vol.4, pp.15-28, 1994-07-25

著者

早稲田大学図書館利用者支援課

出版者

紀伊國屋書店

雑誌

紀伊國屋書店ニュース

巻号頁・発行日

vol.7-8, pp.6-9, 2013-07-16