著者

Terada T.

出版者

東京帝國大學理學部

雑誌

The Journal of the College of Science, Imperial University of Tokyo, Japan

巻号頁・発行日

vol.21, pp.1-34, 1907-03-20

著者

Tsutsui N. Aoki S. Fukugita M. Hashimoto S. Ishikawa K-I. Ishizuka N. Iwasaki Y. Kanaya K. Kaneko T. Kuramashi Y. Okawa M. Onogi T. Taniguchi Y. Ukawa A. Yoshié T.

出版者

American Physical Society

雑誌

Physical review D (ISSN:15507998)

巻号頁・発行日

vol.70, no.11, pp.111501, 2004-12

被引用文献数

24 15

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We present a quenched lattice QCD calculation of the alpha and beta parameters of the proton decay matrix element. The simulation is carried out using the Wilson quark action at three values of the lattice spacing in the range a[approximate]0.1-0.064 fm to study the scaling violation effect. We find only mild scaling violation when the lattice scale is determined by the nucleon mass. We obtain in the continuum limit,

著者

Aoki S. Fukugita M. Hashimoto S. Ishikawa K-I. Ishizuka N. Iwasaki Y. Kanaya K. Kaneda T. Kaya S. Kuramashi Y. Okawa M. Onogi T. Tominaga S. Tsutsui N. Ukawa A. Yamada N. Yoshié T.

出版者

American Physical Society

雑誌

Physical review D (ISSN:05562821)

巻号頁・発行日

vol.62, no.1, pp.014506, 2000-06

被引用文献数

74 95

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We present a model-independent calculation of hadron matrix elements for all dimension-6 operators associated with baryon number violating processes using lattice QCD. The calculation is performed with the Wilson quark action in the quenched approximation at β=6/g2=6.0 on a 282×48×80 lattice. Our results cover all the matrix elements required to estimate the partial lifetimes of (proton,neutron)→(π,K,η)+(ν̅ ,e+,μ+) decay modes. We point out the necessity of disentangling two form factors that contribute to the matrix element; previous calculations did not make the separation, which led to an underestimate of the physical matrix elements. With a correct separation, we find that the matrix elements have values 3–5 times larger than the smallest estimates employed in phenomenological analyses of the nucleon decays, which could give strong constraints on several GUT models. We also find that the values of the matrix elements are comparable with the tree-level predictions of the chiral Lagrangian.

著者

Shintani E. Aoki S. Ishizuka N. Kanaya K. Kikukawa Y. Kuramashi Y. Okawa M. Taniguchi Y. Ukawa A. Yoshié T.

出版者

American Physical Society

雑誌

Physical review D (ISSN:15507998)

巻号頁・発行日

vol.72, no.1, pp.014504, 2005-07

被引用文献数

47 51

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We carry out a feasibility study for the lattice QCD calculation of the neutron electric dipole moment (NEDM) in the presence of the theta term. We develop the strategy to obtain the nucleon EDM from the CP- odd electromagnetic form factor F-3 at small theta, in which NEDM is given by lim(q2 -> 0 theta)F(3)(q(2))/(2m(N)), where q is the momentum transfer and m(N) is the nucleon mass. We first derive a formula which relates F-3, a matrix element of the electromagnetic current between nucleon states, with vacuum expectation values of nucleons and/ or the current. In the expansion of theta, the parity-odd part of the nucleon- current- nucleon three-point function contains contributions not only from the parity-odd form factors but also from the parity-even form factors multiplied by the parity-odd part of the nucleon two- point function, and, therefore, the latter contribution must be subtracted to extract F-3. We then perform an explicit lattice calculation employing the domain- wall quark action with the renormalization group improved gauge action in quenched QCD at a(-1) similar or equal to 2 GeV on a 16(3) x 32 x 16 lattice. At the quark mass m(f)a = 0: 03, corresponding to m(pi)/m(rho) similar or equal to 0:63, we accumulate 730 configurations, which allow us to extract the parityodd part in both two- and three- point functions. Employing two different Dirac gamma matrix projections, we show that a consistent value for F-3 cannot be obtained without the subtraction described above. We obtain F-3(q(2) similar or equal to 0:58 GeV2)/(2m(N))= -0:024(5) e . fm for the neutron and F-3(q(2) similar or equal to 0: 58 GeV2)/(2mN) = 0:021(6)e . fm for the proton.

著者

Chambless D. L. Ollendick T. H. 西村 美佳

出版者

日本行動分析学会

雑誌

行動分析学研究 (ISSN:09138013)

巻号頁・発行日

vol.19, no.1, pp.81-105, 2005-04-25

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アメリカ合衆国における、証拠に基づく心理療法(evidence-based psychology)の実践を増加させようとする努力の結果、経験的に支持された心理的介入についての情報を明らかにし、同定し、普及させるための特別委員会が組織されるに至った。この論文ではアメリカ合衆国やイギリスなどにおける、経験的に支持された処遇(empirically supported treatment, EST)を展望した特別委員会や他のグループの活動成果と、ESTとして同定された処遇のリストを要約して示すことにする。研究方法論や、外的妥当性や、研究の有用性、そしてEST展望過程の信頼性と透明性を含めた、ESTの同定と普及をめぐる論争についても、展望することにする。

著者

Chambless D. L. Ollendick T. H. 西村 美佳

出版者

一般社団法人 日本行動分析学会

雑誌

行動分析学研究 (ISSN:09138013)

巻号頁・発行日

vol.19, no.1, pp.81-105, 2005

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アメリカ合衆国における、証拠に基づく心理療法(evidence-based psychology)の実践を増加させようとする努力の結果、経験的に支持された心理的介入についての情報を明らかにし、同定し、普及させるための特別委員会が組織されるに至った。この論文ではアメリカ合衆国やイギリスなどにおける、経験的に支持された処遇(empirically supported treatment, EST)を展望した特別委員会や他のグループの活動成果と、ESTとして同定された処遇のリストを要約して示すことにする。研究方法論や、外的妥当性や、研究の有用性、そしてEST展望過程の信頼性と透明性を含めた、ESTの同定と普及をめぐる論争についても、展望することにする。

著者

GNANAMANICKAM S.S. MEW T.W.

出版者

日本植物病理学会

雑誌

日本植物病理學會報 (ISSN:00319473)

巻号頁・発行日

vol.58, no.3, pp.380-385, 1992-07-25

被引用文献数

4

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いもち病は熱帯地方の畑栽培稲作の大きな障害である。本報告は, 薬剤に代わる病害防除法として蛍光性Pseudomonas細菌の利用を示唆した。本細菌はいもち病菌分生胞子の発芽を抑制する。FeCl_3 を培地に加えても効力が減退しないので, 抑制の機作はシデロフォア形成によるものではなく, 抗いもち病菌性抗生物質の生産によるものと思われる。本細菌液へのイネ種子の浸漬および立毛苗への細菌の散布によって葉いもち病, 穂首いもち病を軽減することができる。

著者

Umeda T. Isoya J. Morishita N. Ohshima T. Kamiya T. Gali A. Deák P. Son N. T. Janzén E.

出版者

American Physical Society

雑誌

Physical review B (ISSN:10980121)

巻号頁・発行日

vol.70, pp.235212, 2004-12

被引用文献数

50

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The carbon vacancy is a dominant defect in 4H-SiC, and the "EI5" electron-paramagnetic-resonance (EPR) spectrum originates from positively charged carbon vacancies (VC+) at quasicubic sites. The observed state for EI5, however, has been attributed to a motional-averaged state with the C3v symmetry, and its true atomic structure has not been revealed so far. We here report low temperature (<40 K) EPR measurements on EI5 and show that this center has a C1h-symmetric structure due to Jahn-Teller distortion. We also performed ab inito calculations of the hyperfine tensors for EI5, and obtained a good agreement between experiment and theory in not only their principal values but also their principal axis directions. A good agreement was also demonstrated for the EI6 center (hexagonal-site VC+) in this paper. The transition from EI5(C1h) to EI5(C3v) was found to be thermally activated and its activation energy was measured as 0.014 eV.

著者

Umeda T. Ishitsuka Y. Isoya J. Son N. T. Janzén E. Morishita N. Ohshima T. Itoh H. Gali A.

出版者

American Physical Society

雑誌

Physical review B (ISSN:10980121)

巻号頁・発行日

vol.71, pp.193202, 2005-05

被引用文献数

55

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Carbon vacancies (VC) are typical intrinsic defects in silicon carbides (SiC) and so far have been observed only in the form of positively charged states in p-type or semi-insulating SiC. Here, we present electron-paramagnetic-resonance (EPR) and photoinduced EPR (photo-EPR) observations of their negatively charged state (V_C^-) in n-type 4H-SiC. This EPR center (called HEI1) is characterized by an electron spin of 1/2 in a Si-Si antibonding state of VC. First-principles calculations confirm that the HEI1 center arises from V_C^- at hexagonal sites. The HEI1 spectrum shows a transition between C1h and C3v symmetries due to a fast reorientation effect reflected in the nature of this defect. The photo-EPR data suggest that V_C^2- is the dominant form of VC when the Fermi level lies 1.1 eV below the conduction band.

著者

NIIDA Sumaru UEMURA Satoshi HARADA Etsuko T.

出版者

電子情報通信学会

雑誌

IEICE transactions on communications (ISSN:09168516)

巻号頁・発行日

vol.E96-B, no.8, pp.2069-2075, 2013-08

被引用文献数

2

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As mobile multimedia services expand, user behavior will become more diverse and the control of service quality from the user's perspective will become more important in service design. The quality of the network is one of the critical factors determining mobile service quality. However, this has mainly been evaluated in objective physical terms, such as delay reduction and bandwidth expansion. It is less common to use a human-centered design viewpoint when improving network performance. In this paper, we discuss ways to improve the quality of web services using time-fillers that actively address the human factors to improve the subjective quality of a mobile network. A field experiment was conducted, using a prototype. The results of the field experiment show that time-fillers can significantly decrease user dissatisfaction with waiting, but that this effect is strongly influenced by user preferences concerning content. Based on these results, we discuss the design requirements for effective use of time-fillers.

著者

Shunsuke MURAI Tomohiko MATOBA Christopher T. NELSON Takuya KOMINE Koji FUJITA Xiaoqing PAN Katsuhisa TANAKA

出版者

公益社団法人 日本セラミックス協会

雑誌

Journal of the Ceramic Society of Japan (ISSN:18820743)

巻号頁・発行日

vol.121, no.1416, pp.710-713, 2013-08-01 (Released:2013-08-01)

参考文献数

21

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We have prepared composites with anisotropic microstructure consisting of silver nanoparticles and zinc oxide pillars using an oblique angle deposition technique, and examined the optical response originating from their anisotropic morphology. The sample was obtained in three steps. First, the assembly of silver nanoparticles was prepared on a silica glass substrate by electron-beam deposition of the silver thin film and subsequent heat treatment. Next, zinc oxide was obliquely grown by using a pulsed laser deposition. Finally the zinc oxide was crystallized by the post annealing to make an array of inclined pillars grown on the top of the silver nanoparticles. The structure and morphology of the composites were elucidated by a combination of X-ray diffraction analysis and transmission electron microscopy. Optical rotation spectroscopy clarifies that the composite shows optical birefringence due to its inclined pillar morphology. The optical rotation spectrum exhibits two peaks, one being associated to the localized surface plasmon resonance of the silver nanoparticles and the other the excitons in the zinc oxide pillars. The present fabrication method is simple and can be applied to obtain anisotropic composites with relatively large dimensions.

著者

IITAKA T.

雑誌

Nature

巻号頁・発行日

vol.430, pp.442-445, 2004

被引用文献数

2 221

著者

Hara K. O. Usami N. Toh K. Baba M. Toko K. Suemasu T.

出版者

American Institute of Physics

雑誌

Journal of applied physics (ISSN:00218979)

巻号頁・発行日

vol.112, no.08, pp.083108, 2012-10

被引用文献数

83

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Excess-carrier recombination mechanisms in undoped BaSi2 epitaxial films grown by molecular beam epitaxy on n-type silicon substrates have been studied by the microwave-detected photoconductivity decay measurement. The measured excess-carrier decay is multiexponential, and we divided it into three parts in terms of the decay rate. Measurement with various excitation laser intensities indicates that initial rapid decay is due to Auger recombination, while the second decay mode with approximately constant decay to Shockley-Read-Hall recombination. Slow decay of the third decay mode is attributed to the carrier trapping effect. To analyze Shockley-Read-Hall recombination, the formulae are developed to calculate the effective lifetime (time constant of decay) from average carrier concentration. The measurement on the films with the thickness of 50–600 nm shows that the decay due to Shockley-Read-Hall recombination is the slower in the thicker films, which is consistent with the formulae. By fitting the calculated effective lifetime to experimental ones, the recombination probability is extracted. The recombination probability is found to be positively correlated with the full width at half-maximum of the X-ray rocking curves, suggesting that dislocations are acting as recombination centers.

著者

T. Makino

出版者

The Botanical Society of Japan

雑誌

植物学雑誌 (ISSN:0006808X)

巻号頁・発行日

vol.23, no.267, pp.59-75, 1909 (Released:2007-04-05)

被引用文献数

4 6

著者

T.B.Aldrich 著

出版者

日進堂

巻号頁・発行日

1911

著者

Ide T Isozaki H Nakata S Siltanen S

出版者

Institute of Physics

雑誌

Inverse problems (ISSN:02665611)

巻号頁・発行日

vol.26, no.3, pp.035001, 2010-03

被引用文献数

12 12

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Assume one is given a three-dimensional bounded domain with an unknown conductivity distribution inside. Further, suppose that the conductivity consists of a known background and unknown anomalous regions (inclusions) where conductivity values are unknown and different from the background. A method is introduced in Ide et al (2007 Commun. Pure Appl. Math. 60 1415–42) for locating inclusions approximately from noisy localized voltage-to-current measurements performed at the boundary of the body. The method is based on the use of complex geometrical optics solutions and hyperbolic geometry; numerical testing is presented in the aforementioned paper for the two-dimensional case. This work reports the results of computational implementation of the method in dimension three, where both the simulation of data and the computerized inversion algorithm are more complicated than in dimension two. Three new regularizing steps are added to the algorithm, resulting in significantly better robustness against noise. Numerical experiments are reported, suggesting that the approximate location of the inclusions can be reliably recovered from the data with a realistic level of measurement noise. Potential applications of the results include early diagnosis of breast cancer, underground contaminant detection and nondestructive testing.

著者

ガルシア G.W. マックフアーレン R.A. ラロ C.H.O. ヨンクマン T. ビプタ N. 牧田 登之

出版者

日本野生動物医学会

雑誌

Japanese journal of zoo and wildlife medicine (ISSN:13426133)

巻号頁・発行日

vol.6, no.2, pp.61-66, 2001-09

参考文献数

7

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トリニダード・トバコ(ウエストインディズ)が英国から独立した1962年にコクリコは国鳥に指定されたが,1963年のハリケーンで森林の被害が甚大であったので森林の辺縁で棲みつくようになり農民から害鳥扱いされている。1980年の野生動物規制改定から保護鳥から害鳥に扱いが変わったため,コクリコ(ワキアカヒメシヤクケイ)の保存が危機的になってきている。コクリコの繁殖のために,トリニダードの動物園でのコクリコの飼育状態とトバコでコクリコを飼育している推定15名のうち5名(4ヶ所)に面接し,質問状を送った10名中の2名から返答を得たことを併せて報告する。コクリコの肉は蛋白質(24.1%)に富み脂肪が少ない(0.4%)ので健康食品として注目されている。コクリコ飼育者はすべて40歳以上の男性で趣味として飼っている。この人達は,アグーチ,ペッカリー,イグアナ等他の野生動物も飼っている。飼育中のコクリコは,動物園でもトバコの4ヶ所でも,地面や巣箱に産卵し,ふ化にも成功している。季節性はないようである。野生でコクリコが繁殖している南米本土に近いトリニダードで野生コクリコが見られず,トリニダードより北東25km離れたトバコではコクリコが土着であるのは興味深い。

著者

Avsar E Hatta Y Flensburg C Ollitrault J-Y Ueda T

出版者

IOP

雑誌

Journal of physics. G, Nuclear and particle physics (ISSN:09543899)

巻号頁・発行日

vol.38, no.12, pp.124053, 2011-11

被引用文献数

9 16

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High-multiplicity proton–proton collisions at the LHC may exhibit collective phenomena such as elliptic flow. We study this issue using DIPSY, a brand-new Monte Carlo event generator which features almost-NLO BFKL dynamics and describes the transverse shape of the proton including all fluctuations. We predict the eccentricity of the collision as a function of the multiplicity and estimate the magnitude of elliptic flow. We suggest that flow can be signaled by a sign change in the four-particle azimuthal correlation.

著者

PAINE R. T.

雑誌

American Naturalist

巻号頁・発行日

vol.100, pp.65-75, 1966

被引用文献数

34 3225

著者

Hosokawa S. Inui M. Kajihara Y. Matsuda K. Ichitsubo T. Pilgrim W. -C. Sinn H. Gonzalez L. E. Gonzalez D. J. Tsutsui S. Baron A. Q. R.

出版者

American Physical Society

雑誌

PHYSICAL REVIEW LETTERS (ISSN:00319007)

巻号頁・発行日

vol.102, no.10, 2009-03

被引用文献数

125

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The transverse acoustic excitation modes were detected by inelastic x-ray scattering in liquid Ga in the Q range above 9  nm-1 although liquid Ga is mostly described by a hard-sphere liquid. An ab initio molecular dynamics simulation clearly supports this finding. From the detailed analysis for the S(Q, ω) spectra with a good statistic quality, the lifetime of 0.5 ps and the propagating length of 0.4–0.5 nm can be estimated for the transverse acoustic phonon modes, which may correspond to the lifetime and size of cages formed instantaneously in liquid Ga.