3,026 research outputs found
The Williams Conjecture is false for irreducible subshifts
We show the Williams Conjecture is false for irreducible shifts of finite
type by examining relative sign-gyration numbers of conjugacies between shifts
with no points of period one or two.Comment: 14 pages, published versio
Non-stationarity of isomorphism between AF algebras defined by stationary Bratteli diagrams
We first study situations where the stable AF-algebras defined by two square
primitive nonsingular incidence matrices with nonnegative integer matrix
elements are isomorphic even though no powers of the associated automorphisms
of the corresponding dimension groups are isomorphic. More generally we
consider neccessary and sufficient conditions for two such matrices to
determine isomorphic dimension groups. We give several examples.Comment: 16 page
The influence of gender and cultural values on savoring in Korean undergraduates
The present study investigated antecedents of savoring beliefs and responses in a sample of South Korean college students. Historically, Korea has been strongly influenced by Chinese Confucianism, which emphasizes not only gender-role differentiation and patriarchal norms, but also the dampening of emotions as a culturally appropriate style of positive emotional regulation. We hypothesized that Korean females, relative to males, would reject traditional Asian cultural values in order to gain more empowerment, and would, as a result, report a greater capacity to savor positive experience. Confirming the hypotheses, Korean women, compared to men, reported stronger disagreement with traditional Asian values, greater overall savoring ability, greater capacity for cognitive elaboration, and less use of dampening and greater use of amplifying as savoring responses to positive events. Path analyses supported our hypothesized mediational model in which Korean women, relative to men, more strongly rejected traditional Asian values, which predicted less dampening (but only marginally greater amplifying). We conclude that among young Korean adults: (a) savoring is a relevant concept; (b) traditional Asian values tend to promote dampening of positive emotions; and (c) women more strongly reject traditional cultural values, tend to engage in less dampening and greater amplifying, and perceive greater savoring capacity, relative to men
Enhanced overall efficiency of GaInN-based light-emitting diodes with reduced efficiency droop by Al-composition-graded AlGaN/GaN superlattice electron blocking layer
AlxGa1-xN/GaN superlattice electron blocking layers (EBLs) with gradually decreasing Al composition toward the p-type GaN layer are introduced to GaInN-based high-power light-emitting diodes (LEDs). GaInN/GaN multiple quantum well LEDs with 5- and 9-period Al-composition-graded AlxGa1-xN/GaN EBL show comparable operating voltage, higher efficiency as well as less efficiency droop than LEDs having conventional bulk AlGaN EBL, which is attributed to the superlattice doping effect, enhanced hole injection into the active region, and reduced potential drop in the EBL by grading Al compositions. Simulation results reveal a reduction in electron leakage for the superlattice EBL, in agreement with experimental results. (C) 2013 AIP Publishing LLC.open1133sciescopu
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