9,236 research outputs found
Ground-state phase diagram of the Kondo lattice model on triangular-to-kagome lattices
We investigate the ground-state phase diagram of the Kondo lattice model with
classical localized spins on triangular-to-kagome lattices by using a
variational calculation. We identify the parameter regions where a
four-sublattice noncoplanar order is stable with a finite spin scalar chirality
while changing the lattice structure from triangular to kagome continuously.
Although the noncoplanar spin states appear in a wide range of parameters, the
spin configurations on the kagome network become coplanar as approaching the
kagome lattice; eventually, the scalar chirality vanishes for the kagome
lattice model.Comment: 7 pages, 3 figure
Global attractors for doubly nonlinear evolution equations with non-monotone perturbations
This paper proposes an abstract theory concerned with dynamical systems
generated by doubly nonlinear evolution equations governed by subdifferential
operators with non-monotone perturbations in a reflexive Banach space setting.
In order to construct global attractors, an approach based on the notion of
generalized semiflow is employed instead of the usual semi-group approach,
since solutions of the Cauchy problem for the equation might not be unique.
Moreover, the preceding abstract theory is applied to a generalized Allen-Cahn
equation whose potential is divided into a convex part and a non-convex part as
well as a semilinear parabolic equation with a nonlinear term involving
gradients
Stability of non-isolated asymptotic profiles for fast diffusion
The stability of asymptotic profiles of solutions to the Cauchy-Dirichlet
problem for Fast Diffusion Equation (FDE, for short) is discussed. The main
result of the present paper is the stability of any asymptotic profiles of
least energy. It is noteworthy that this result can cover non-isolated
profiles, e.g., those for thin annular domain cases. The method of proof is
based on the Lojasiewicz-Simon inequality, which is usually used to prove the
convergence of solutions to prescribed limits, as well as a uniform extinction
estimate for solutions to FDE. Besides, local minimizers of an energy
functional associated with this issue are characterized. Furthermore, the
instability of positive radial asymptotic profiles in thin annular domains is
also proved by applying the Lojasiewicz-Simon inequality in a different way
New trends in active filters for improving power quality
Since their basic compensation principles were proposed around 1970, active filters have been studied by many researchers and engineers aiming to put them into practical applications. Shunt active filters for harmonic compensation with or without reactive power compensation, flicker compensation or voltage regulation have been put on a commercial base in Japan, and their rating or capacity has ranged from 50 kVA to 60 MVA at present. In near future, the term of active filters will cover a much wider sense than that of active filters in the 1970s did. The function of active filters will be expanded from voltage flicker compensation or voltage regulation into power quality improvement for power distribution systems as the capacity of active filters becomes larger. This paper describes present states of the active filters based on state-of-the-art power electronics technology, and their future prospects toward the 21st century, including the personal view and expectation of the author</p
Sellars on Functionalism and Normativity
The term âfunctionalismâ is usually heard in connection with the philosophy of mind or cognition. The functionalism of Wilfrid Sellars, however, is in the first instance as response to the worries about the metaphysics not of mental states, but of meaning. Only late in his career did Sellars explore the possibility of extending his functionalism into an account of cognition. It has been suggested, though, that Sellarsâ extension of his functionalist theory into subpersonal territory is not successful. In particular, there is a worry abroad that in order to be a functionalist about cognitive states, Sellars must succumb to a special form of the Myth of the Given. In this essay I will review and elucidate what I take to be the structure of Sellarsâ functionalism, defending it from this worry. I will suggest a resolution of some apparent textual contradictions based in part on the chronology of Sellarsâ writing, with the assumption that later writings express Sellarsâ more nuanced views.
Draft of 2009
Human cell line (HGC-27) derived from the metastatic lymph node of gastric cancer
A cell line (HGC-27) was established by culture of the metastatic lymph node from a gastric cancer patient diagnosed histologically as undifferentiated carcinoma. HGC-27 cells were polygonal or short spindle-shaped and adhered to glass surfaces as a monolayer. The cells were probably derived from gastric cancer cells, as their origin from mesenchymal tissues can be excluded morphologically and enzyme-histochemically. Enzyme activities were generally negative or low, except for adenosine triphosphatase, lactic dehydrogenase and leucine aminopeptidase. These scanty findings might reflect the undifferentiated character of the original tumor cells. The cloning efficiency was 5.3% in liquid medium and 1.0% in soft agar. The doubling time was about 17 hr. Chromosomal analysis revealed a mode of 109 and 110 chromosomes.</p
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