824 research outputs found
New Darboux Transformation for Hirota-Satsuma coupled KdV System
A new Darboux transformation is presented for the Hirota-Satsuma coupled KdV
system. It is shown that this Darboux transformation can be constructed by
means of two methods: Painlev\'{e} analysis and reduction of a binary Darboux
transformation. By iteration of the Darboux transformation, the Grammian type
solutions are found for the coupled KdV system.Comment: LaTeX 2.09, 10 page
Decouple a coupled KdV system of Nutku and O\~{g}uz
A coupled KdV system with a free parameter proposed by Nutku and O\~{g}uz is
considered. It is shown that the system passes the WTC's Painlev\'{e} test for
arbitrary value of the parameter. A further analysis yields that the parameter
can be scaled away and the system can be decoupled.Comment: LaTeX 209, 4 page
Thiophene-2-carbaldehyde 2,4-dinitrophenylhydrazone
In the approximately planar molecule of the title compound, C11H8N4O4S, the dihedral angle between the thiophene and benzene rings is 5.73 (10)°. In the crystal structure, bifurcated inter/intramolecular N—H⋯(O,O) hydrogen bonds are present. The intermolecular links lead to inversion dimers containing an R
2
2(12) graph-set motif
Coupled KdV equations derived from atmospherical dynamics
Some types of coupled Korteweg de-Vries (KdV) equations are derived from an
atmospheric dynamical system. In the derivation procedure, an unreasonable
-average trick (which is usually adopted in literature) is removed. The
derived models are classified via Painlev\'e test. Three types of
-function solutions and multiple soliton solutions of the models are
explicitly given by means of the exact solutions of the usual KdV equation. It
is also interesting that for a non-Painlev\'e integrable coupled KdV system
there may be multiple soliton solutions.Comment: 19 pages, 2 figure
MECHANISMS UNDERLYING ACTION OF XINMAILONG INJECTION, A TRADITIONAL CHINESE MEDICINE IN CARDIAC FUNCTION IMPROVEMENT
Background: As a bioactive composite extracted from American cockroach, Xinmailong injection (XML) is used for the
treatment of congestive heart failure (CHF) in China. Clinical data has provided evidence that XML has positive inotropic
properties. The objective of this study was to assess the mechanisms involved in the therapeutical effect of XML on CHF.
Materials and Methods: The effects of XML on the cardiac function in isolated rat heart were measured. A Ca2+ imaging
technology was used in rat cardiomyocytes (H9c2 cells) to reveal the role of XML on Ca2+ channels. Meanwhile, the effects of
XML on the activities of Na+/K+ ATPase and sodium/calcium exchanger were measured. In addition, the level of reactive
oxygen species and the protein expressions for the superoxide dismutase and hemeoxygenase were determined in the
cardiomyocytes.
Results: The results showed that XML increased the electrical impulse-induced [Ca2+]i in H9c2 cells, which was dependant on
extracellular Ca2+ and was abolished by ML218-HCl (a T-type Ca2+channels antagonist) but not nimodipine (a L-type
Ca2+channels antagonist). Ouabain, a Na+/K+-ATPase inhibitor, increased the electrical impulse-induced [Ca2+]i, which was
significantly inhibited by XML. Moreover, XML markedly inhibited the Na+/K+ ATPase activity in H9c2 cells. In addition,
XML notably reduced the production of reactive oxygen species and enhanced the protein expressions of antioxidant
enzymes including superoxide dismutase 1, superoxide dismutase 2 and hemeoxygenase 1 in H9c2 cell.
Conclusion: Our findings pave the ways to the better understandings of the therapeutic effects of XML on cardiovascular
system
A simulation study on the measurement of D0-D0bar mixing parameter y at BES-III
We established a method on measuring the \dzdzb mixing parameter for
BESIII experiment at the BEPCII collider. In this method, the doubly
tagged events, with one decays to
CP-eigenstates and the other decays semileptonically, are used to
reconstruct the signals. Since this analysis requires good separation,
a likelihood approach, which combines the , time of flight and the
electromagnetic shower detectors information, is used for particle
identification. We estimate the sensitivity of the measurement of to be
0.007 based on a fully simulated MC sample.Comment: 6 pages, 7 figure
The CDEX-1 1 kg Point-Contact Germanium Detector for Low Mass Dark Matter Searches
The CDEX Collaboration has been established for direct detection of light
dark matter particles, using ultra-low energy threshold p-type point-contact
germanium detectors, in China JinPing underground Laboratory (CJPL). The first
1 kg point-contact germanium detector with a sub-keV energy threshold has been
tested in a passive shielding system located in CJPL. The outputs from both the
point-contact p+ electrode and the outside n+ electrode make it possible to
scan the lower energy range of less than 1 keV and at the same time to detect
the higher energy range up to 3 MeV. The outputs from both p+ and n+ electrode
may also provide a more powerful method for signal discrimination for dark
matter experiment. Some key parameters, including energy resolution, dead time,
decay times of internal X-rays, and system stability, have been tested and
measured. The results show that the 1 kg point-contact germanium detector,
together with its shielding system and electronics, can run smoothly with good
performances. This detector system will be deployed for dark matter search
experiments.Comment: 6 pages, 8 figure
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