Competition of resonant and nonresonant paths in resonance-enhanced two-photon single ionization of He by an ultrashort extreme-ultraviolet pulse

We theoretically study the pulse-width dependence of the photoelectron angular distribution (PAD) from the resonance-enhanced two-photon single ionization of He by femtosecond ($\lesssim 20$ fs) extreme-ultraviolet pulses, based on the time-dependent perturbation theory and simulations with the full time-dependent Schr\"odinger equation. In particular, we focus on the competition between resonant and nonresonant ionization paths, which leads to the relative phase $\delta$ between the $S$ and $D$ wave packets distinct from the corresponding scattering phase shift difference. When the spectrally broadened pulse is resonant with an excited level, the competition varies with pulse width, and, therefore, $\delta$ and the PAD also change with it. On the other hand, when the Rydberg manifold is excited, $\delta$ and the PAD do not much vary with the pulse width, except for the very short pulse regime.Comment: 5 pages, 5 figures, 1 tabl

Complex Eigenfunction Method for Bending Analysis of Rectangular Plates

The present article will give a Fadle eigenfunction analysis of rectangular plates in flexure by means of complex matrix algebra. Rectangular plates have many structural applications, and their flexural analysis is thus of considerable importance. The solution of the flexural problems of classical elasticity generally involves the satisfaction of the homogeneous biharmonic equation and the imposed boundary conditions. Although these boundary value problems have been the subject of many investigators and the literature is replete with numerous solu-tions, many problems of practical interest have not been solved with respect to the actual imposed boundary conditions. Fadle and Papkovitch were the first to present a method for solving rectangular plate problems by the use of complex biharmonic eigenfunction. The utility of a representation in terms of a Fadle eigenfunction series is contingent on the ability to express arbitrary functions in terms of the series. Each term of a series of these functions satisfies the governing differential equation (nabla)4w = 0 and certain homogeneous boundary conditions on two parallel edges identically. In addition, each term of the general eigenfunction series, when written for finite rectangular plates, contains two arbitrary complex constants which can be used to satisfy arbitrary boundary conditions on the remaining two edges. Thus, the use of these eigenfunction permits the simultaneous satisfaction of the boundary conditions on all four sides of the rectangular plate. An approximate expansion formula is developed and applied to the flexural rectangular plate problem. The analysis can be made for complex quantitiesas as these appear, and needs not to separate real parts from imaginary ones, because these can be evaluated numerically with digital computers.Article信州大学工学部紀要 32: 23-42 (1972)departmental bulletin pape

非瞬間解釈に関する実験結果の解釈について

Brennan and Pylkkänen (2008) claim to have obtained experimental evidence for aspectual coercion (with a specific direction). However, their conclusion is invalid. For one thing, they misconstrued the issue. For another, their result does not support their conclusion; rather, in the absence of a hitherto unknown new interpretation, a comparison of their result with the previous findings in the literature supports a noncoercion analysis that Brennan & Pylkkänen believe to have succeeded in dismissing

Evidence from Coarticulation Sensitivity

Phonemic perception exhibits coarticulation sensitivity, phonotactic sensitivity and lexical sensitivity. Three kinds of models of speech perception are found in the literature, which embody different answers to the question of how the three kinds of sensitivity are related to each other: two-step models, one-step models and lexicalist models. In two-step models (Church, 1987), phonemes are first extracted, and phonotactic repairs are subsequently made on the obtained phoneme string; both phonemic categorization and phonotactic repair are sublexical, and coarticulation sensitivity should only affect initial (pre-phonotactic) phonemic categorization. In one-step models (Dehaene-Lambertz et al., 2000; Dupoux et al., 2011; Mehler et al., 1990), phonemic categorization and phonotactic repair are sublexical and simultaneous; phonotactic repairs themselves depend on coarticulation cues. Such models can be implemented in two different versions: suprasegmental matching, according to which a speech signal is matched against phonotactics-respecting suprasegmental units (such as syllables), rather than phonemes, and slot filling, according to which a speech signal is matched against phonemes as fillers for slots in phonotactics-respecting suprasegmental units. In lexicalist models (Cutler et al., 2009; McClelland & Elman, 1986), coarticulation sensitivity and/or phonotactic sensitivity reduce to lexical sensitivity. McClelland & Elman (1986) claim a lexicalist reduction of phonotactic sensitivity; Cutler et al.'s (2009) make a claim implying lexicalist reductions both of phonotactic sensitivity and of coarticulation sensitivity. This thesis attempts to distinguish among those models. Since different perceptual processes are assumed in these three models (whether sublexical units are perceived, or how many stages are involved in perceptual processing), our understanding of how speech perception works crucially depends on the relative superiority of those three kinds of models. Based on the results available in the past literature on the one hand, and on the results of perceptual experiments with Japanese listeners testing their coarticulation sensitivity in different settings on the other, this thesis argues for the superiority of the slot filling version of one-step models over the others. According to this conclusion, phonemic parsing (categorization) and phonotactic parsing (repair) are separate but parallel sublexical processes

Phonemic categorization and phonotactic repair as parallel sublexical processes : evidence from coarticulation sensitivity

Phonemic perception exhibits coarticulation sensitivity, phonotactic sensitivity and lexical sensitivity. Three kinds of models of speech perception are found in the literature, which embody different answers to the question of how the three kinds of sensitivity are related to each other: two-step models, one-step models and lexicalist models. In two-step models (Church, 1987), phonemes are first extracted, and phonotactic repairs are subsequently made on the obtained phoneme string; both phonemic categorization and phonotactic repair are sublexical, and coarticulation sensitivity should only affect initial (prephonotactic) phonemic categorization. In one-step models (Dehaene-Lambertz et al., 2000; Dupoux et al., 2011; Mehler et al., 1990), phonemic categorization and phonotactic repair are sublexical and simultaneous; phonotactic repairs themselves depend on coarticulation cues. Such models can be implemented in two different versions: suprasegmental matching, according to which a speech signal is matched against phonotactics-respecting suprasegmental units (such as syllables), rather than phonemes, and slot filling, according to which a speech signal is matched against phonemes as fillers for slots in phonotactics-respecting suprasegmental units. In lexicalist models (Cutler et al., 2009; McClelland & Elman, 1986), coarticulation sensitivity and/or phonotactic sensitivity reduce to lexical sensitivity. McClelland & Elman (1986) claim a lexicalist reduction of phonotactic sensitivity; Cutler et al.’s (2009) make a claim implying lexicalist reductions both of phonotactic sensitivity and of coarticulation sensitivity. This thesis attempts to distinguish among those models. Since different perceptual processes are assumed in these three models (whether sublexical units are perceived, or how many stages are involved in perceptual processing), our understanding of how speech perception works crucially depends on the relative superiority of those three kinds of models. Based on the results available in the past literature on the one hand, and on the results of perceptual experiments with Japanese listeners testing their coarticulation sensitivity in different settings on the other, this thesis argues for the superiority of the slot filling version of one-step models over the others. According to this conclusion, phonemic parsing (categorization) and phonotactic parsing (repair) are separate but parallel sublexical processes

Weighted Constraints in Phoneme Perception

The roles played by two allophonic constraints in the perception of stop consonants in Japanese are discussed. If the finding reported in this paper is real, it means that different constraints are utilized with different strengths

21 Figure Sines and Cosines with Radian Arguments

Article信州大学工学部紀要 23: 35-76 (1967)departmental bulletin pape

Operational Method for Various Continuous Beams

Article信州大学工学部紀要 24: 1-22 (1968)departmental bulletin pape