7,948 research outputs found
Effect of Kondo resonance on optical third harmonic generation
We use the method of dynamical mean field thoery, to study the effect of
Kondo resonance on optical third harmonic generation (THG) spectra of strongly
correlated systems across the metal-insulator transition. We find that THG
signals are proportional to the quasiparticle weight of the Kondo peak, and
are precursors of Mott-Hubbard gap formation.Comment: ICM 2006 (kyoto) proceedin
Emergence of world-stock-market network
In the age of globalization, it is natural that the stock market of each
country is not independent form the other markets. In this case, collective
behavior could be emerged form their dependency together. This article studies
the collective behavior of a set of forty influential markets in the world
economy with the aim of exploring a global financial structure that could be
called world-stock-market network. Towards this end, we analyze the
cross-correlation matrix of the indices of these forty markets using Random
Matrix Theory (RMT). We find the degree of collective behavior among the
markets and the share of each market in their structural formation. This
finding together with the results obtained from the same calculation on four
stock markets reinforce the idea of a world financial market. Finally, we draw
the dendrogram of the cross-correlation matrix to make communities in this
abstract global market visible. The dendrogram, drawn by at least thirty
percent of correlation, shows that the world financial market comprises three
communities each of which includes stock markets with geographical proximity
Angelica keiskei, an emerging medicinal herb with various bioactive constituents and biological activities.
Angelica keiskei (Miq.) Koidz. (Umbelliferae) has traditionally been used to treat dysuria, dyschezia, and dysgalactia as well as to restore vitality. Recently, the aerial parts of A. keiskei have been consumed as a health food. Various flavonoids, coumarins, phenolics, acetylenes, sesquiterpene, diterpene, and triterpenes were identified as the constituents of A. keiskei. The crude extracts and pure constituents were proven to inhibit tumor growth and ameliorate inflammation, obesity, diabetics, hypertension, and ulcer. The extract also showed anti-thrombotic, anti-oxidative, anti-hyperlipidemic, anti-viral, and anti-bacterial activities. This valuable herb needs to be further studied and developed not only to treat these human diseases but also to improve human health. Currently A. keiskei is commercialized as a health food and additives in health drinks. This article presents a comprehensive review of A. keiskei and its potential place in the improvement of human health
Modules with Finite Cousin Cohomologies Have Uniform Local Cohomological Annihilators
Let A be a Noetherian ring. It is shown that any finite A--module M of finite
Krull dimension with finite Cousin complex cohomologies has a uniform local
cohomological annihilator. The converse is also true for a finite module M
satisfying (S_2) which is over a local ring with Cohen--Macaulay formal fibres.Comment: 9 pages, to appear in Journal of Algebr
On functions with strongly δ-semiclosed graphs
In 1997, Park et al. [5] offered a new notion called δ-semiopen sets which are stronger than semi-open sets but weaker than δ-open sets. It is the aim of this paper to introduce and study some properties of functions with strongly δ-semiclosed graphs by utilizing δ-semiopen sets and the δ-semi-closure operator
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