50,310 research outputs found
Butterflies of the Rocky Mountain States. Edited by Clifford D. Ferris and F. Martin Brown. University of Oklahoma Press, Norman. 464 pages, incl. 4 color plates. 1981. 15.95 (paper).
(excerpt)
The long awaited guide to the butterflies of the Rocky Mountains will be received with great delight by many lepidopterists who collect butterflies in this rugged and beautiful region
The World of Moths. Michael Dickens and Eric Storey. Macmillan Publishing Co., Inc., New York, 1974. 128 p., 103 plates. $6.95.
(excerpt)
This little book will undoubtedly please the amateur collector and rearer of the exotically and exquisitely colored species such as found in the Saturniidae and Sphing- idae. Of the 103 colored photographic plates, 69 illustrate species from these two popular families. Each species is figured on a white background in sharp and vivid color. One species is figured on a page, except for Epicopeia polydora, which includes a figure of its mimetic model Papilio rhetenor
AN INDEX TO THE DESCRIBED LI1:E HISTORIES, EARLY STAGES AND HOSTS OF THE MACROLEPIDOPTERA OF THE CONTINENTAL UNITED STATES AND CANADA,\u27\u27 by Harrison Morton Tietz, 1972
AN INDEX TO THE DESCRIBED LI1:E HISTORIES, EARLY STAGES AND HOSTS OF THE MACROLEPIDOPTERA OF THE CONTINENTAL UNITED STATES AND CANADA,\u27\u27 by Harrison Morton Tietz, 1972. Two volumes, 1041 p., published by A. C. Allyn for the Allyn Museum of Entomology, Sarasota, Florida. Distributed exclusively in North America by Entomological Reprint Specialists, P.O. Box 77971, Dockweiler Station, Los Angeles, California 90007. Price: $25.00 U.S. per set
Radiative decay of the X(3872) as a mixed molecule-charmonium state in QCD Sum Rules
We use QCD sum rules to calculate the width of the radiative decay of the
meson X(3872), assumed to be a mixture between charmonium and exotic molecular
states with . We find that in a small
range for the values of the mixing angle, , we get the
branching ratio , which is in agreement, with the experimental
value. This result is compatible with the analysis of the mass and decay width
of the mode performed in the same approach.Comment: 7 pages, 9 figures; revised version accepted for publication in Phys.
Rev.
The trumping relation and the structure of the bipartite entangled states
The majorization relation has been shown to be useful in classifying which
transformations of jointly held quantum states are possible using local
operations and classical communication. In some cases, a direct transformation
between two states is not possible, but it becomes possible in the presence of
another state (known as a catalyst); this situation is described mathematically
by the trumping relation, an extension of majorization. The structure of the
trumping relation is not nearly as well understood as that of majorization. We
give an introduction to this subject and derive some new results. Most notably,
we show that the dimension of the required catalyst is in general unbounded;
there is no integer such that it suffices to consider catalysts of
dimension or less in determining which states can be catalyzed into a given
state. We also show that almost all bipartite entangled states are potentially
useful as catalysts.Comment: 7 pages, RevTe
(2317) meson production at RHIC
Production of (2317) mesons in relativistic heavy ion collisions at
RHIC is studied. Using the quark coalescence model, we first determine the
initial number of (2317) mesons produced during hadronization of
created quark-gluon plasma. The predicted (2317) abundance depends
sensitively on the quark structure of the (2317) meson. An
order-of-magnitude larger yield is obtained for a conventional two-quark than
for an exotic four-quark (2317) meson. To include the hadronic effect
on the (2317) meson yield, we have evaluated the absorption cross
sections of the (2317) meson by pion, rho, anti-kaon, and vector
anti-kaon in a phenomenological hadronic model. Taking into consideration the
absorption and production of (2317) mesons during the hadronic stage of
heavy ion collisions via a kinetic model, we find that the final yield of
(2317) mesons remains sensitive to its initial number produced from the
quark-gluon plasma, providing thus the possibility of studying the quark
structure of the (2317) meson and its production mechanism in
relativistic heavy ion collisions.Comment: 12 pages, 6 figure
Global Quantum Discord in Multipartite Systems
We propose a global measure for quantum correlations in multipartite systems,
which is obtained by suitably recasting the quantum discord in terms of
relative entropy and local von Neumann measurements. The measure is symmetric
with respect to subsystem exchange and is shown to be non-negative for an
arbitrary state. As an illustration, we consider tripartite correlations in the
Werner-GHZ state and multipartite correlations at quantum criticality. In
particular, in contrast with the pairwise quantum discord, we show that the
global quantum discord is able to characterize the infinite-order quantum phase
transition in the Ashkin-Teller spin chain.Comment: v3: 7 pages, 6 figures. Published versio
Production of the Y(4260) State in B Meson Decay
We calculate the branching ratio for the production of the meson in
the decay . We use QCD sum rules approach and we consider
the to be a mixture between charmonium and exotic tetraquark,
, states with . Using the value of the
mixing angle determined previously as: , we get the
branching ratio , which
allows us to estimate an interval on the branching fraction in agreement with the experimental
upper limit reported by Babar Collaboration.Comment: 5 pages, 2 figures, 1 table. arXiv admin note: text overlap with
arXiv:1105.134
A Melanic Pieris Rapae from Michigan (Lepidoptera: Pierdae)
The Arthur J. Yates collection of Michigan Lepidoptera, recently donated to Michigan State University (see Fischer, 1967), contained a striking melanic male cabbage butterfly [Pieris rapae (Linnaeus)] (Figs. 1, 2) now incorporated into the MSU series. Yates collected the specimen on 29 May 1934 in Roseville, Macomb County, near the western shore of Lake St. Clair in southeastern Michigan. An examination of the androconia and genitalia, using the characters described by Chang (1963), assured proper identification of the specimen. Although we have found no record of a similar rapae taken in North America, there are some named European forms of various species of Pieris that resemble our specimen
Temporal-mode continuous-variable cluster states using linear optics
I present an extensible experimental design for optical continuous-variable
cluster states of arbitrary size using four offline (vacuum) squeezers and six
beamsplitters. This method has all the advantages of a temporal-mode encoding
[Phys. Rev. Lett. 104, 250503], including finite requirements for coherence and
stability even as the computation length increases indefinitely, with none of
the difficulty of inline squeezing. The extensibility stems from a construction
based on Gaussian projected entangled pair states (GPEPS). The potential for
use of this design within a fully fault tolerant model is discussed.Comment: 9 pages, 19 color figure
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