Sophia University

About: Sophia University is a education organization based out in Tokyo, Japan. It is known for research contribution in the topics: Nonlinear system & Catalysis. The organization has 4986 authors who have published 7657 publications receiving 106567 citations. The organization is also known as: Jōchi Daigaku.

Compressive Behavior of Multiply Delaminated Composite Laminates Part 1: Experiment and Analytical Development

Abstract: The basic mechanics and mechanism concerning compressive stability of composite laminates with multiple circular delaminations is studied analytically and experimentally. An experimental program, employing two types of quasi-isotropic laminates with a conventional and toughened epoxy resin, is used to evaluate the validity of the mechanistic model and further demonstrate the accuracy of finite element analysis conducted in the associated paper. Embedded delaminations are introduced at regular intervals in the thickness direction. The loading edges are fixed, and the side edges are simply supported. Although the buckling load does not depend on the matrix resin toughness, the strength is affected by the toughness. In the analysis, a buckling equation is derived using the Rayleigh-Ritz method, based on classical plate theory and solved as an eigenvalue problem. This method is chosen due to its efficiency. As the buckling mode of the lowest buckling load becomes physically admissible due to the assumptions of equally spaced delaminations and the classical plate theory, the contact problem does not need to be considered, that is, all of the delaminated portions deform by the same amount and do not overlap one another even without any constraints. The buckling loads analytically obtained agree well with experimental and finite element results described in the associated paper. The effects of size and number of circular delaminations on the buckling and failure load are also discussed in detail.

Selective separation of water–ethanol mixture through synthetic polymer membranes having carboxylic acid as a functional group

Abstract: Separation of water–ethanol mixture through a membrane was carried out by pervaporation using a membrane which provided a hydrogen-bonding interaction. A membrane obtained from poly(acrylic acid-co-acrylonitrile) was effective for a selective separation of water from aqueous ethanol solution by pervaporation technique. Spectroscopic and flux analyses verified that this high selectivity toward water was attributed to the hydrogen-bonding interaction between water and acrylic acid (carboxylic acid) unit in the membrane. On the other hand, a membrane from poly(acrylic acid-co-styrene) preferentially permeated ethanol in the low water feed concentration region.

Numerical estimation of the β function in two-dimensional systems with spin-orbit coupling

Abstract: We report a numerical study of Anderson localization in a two-dimensional (2D) system of noninteracting electrons with spin-orbit coupling. We analyze the scaling of the renormalized localization length for the 2D SU(2) model and estimate its $\ensuremath{\beta}$ function over the full range from the localized to the metallic limits.

Quantum receivers with squeezing and photon-number-resolving detectors for M -ary coherent state discrimination

Abstract: We propose quantum receivers with optical squeezing and photon-number-resolving detectors (PNRDs) for the near-optimal discrimination of quaternary phase-shift-keyed coherent state signals. The basic scheme is similar to the previous proposals [e.g., Izumi et al., Phys. Rev. A 86, 042328 (2012)] in which displacement operations, on-off detectors, and electrical feedforward operations were used. Here we study two types of receivers, one of which installs optical squeezings and the other uses PNRDs instead of on-off detectors. We show that both receivers can attain lower error rates than that in the previous scheme. In particular, we show the PNRD-based receiver has a significant gain when the ratio between the mean photon number of the signal and the number of the feedforward steps is relatively high, in other words, when the probability of detecting two or more photons at each detector is not negligible. Moreover, we show that the PNRD-based receiver can suppress the errors due to dark counts, which the receiver with the on-off detector cannot do with a small number of feedforwards.