626 research outputs found
Quark number scaling of hadronic spectra and constituent quark degree of freedom in -Pb collisions at TeV
We show that the experimental data of spectra of identified hadrons
released recently by ALICE collaboration for -Pb collisions at
TeV exhibit a distinct universal behavior --- the quark
number scaling. We further show that the scaling is a direct consequence of
quark (re-)combination mechanism of hadronization and can be regarded as a
strong indication of the existence of the underlying source with constituent
quark degree of freedom for the production of hadrons in -Pb collisions at
such high energies. We make also predictions for production of other hadrons.Comment: 5 pages, 3 figure
4-Chlorophenyl 2-oxo-2H-chromene-3-carboxylate
In title compound, C16H9ClO4, the coumarin ring system is approximately planar [maximum deviation = 0.056 (1) Å] and is oriented with respect to the benzene ring at an angle of 22.60 (7)°. Intermolecular C—H⋯O hydrogen bonding is present in the crystal
Phosphorescent Molecularly Doped Light-Emitting Diodes with Blended Polymer Host and Wide Emission Spectra
Stable green light emission and high efficiency organic devices with three polymer layers were fabricated using bis[2-(4 -tert-butylphenyl)-1-phenyl-1H-benzoimidazole-N,C 2 ] iridium(III) (acetylacetonate) doped in blended host materials. The 1 wt% doping concentration showed maximum luminance of 7841 cd/cm 2 at 25.6 V and maximum current efficiency of 9.95 cd/A at 17.2 V. The electroluminescence spectra of devices indicated two main peaks at 522 nm and 554 nm coming from phosphor dye and a full width at half maximum (FWHM) of 116 nm. The characteristics of using blended host, doping iridium complex, emission spectrum, and power efficiency of organic devices were investigated
Neoline from Aconitum flavum Hand
The title compound, C24H39NO6 [systematic name: (1α,6α,14α,16β)-N-ethyl-6,16-dimethoxy-4-methoxymethylaconitane-1,8,14-triol], is a C19-diterpenoid alkaloid from the roots of Aconitum flavum Hand. The molecule has an aconitane carbon skeleton with four six-membered rings and two five-membered rings. Both five-membered rings adopt envelope conformations. Two six-membered rings adopt chair conformations, whereas the other two adopt boat conformations. Intramolecular O—H⋯O and O—H⋯N and intermolecular O—H⋯O hydrogen bonds are present in the structure. In the crystal, one methyl group is disordered over two sites with an occupancy ratio of 0.70 (3):0.30 (3)
Oosporein from Tremella fuciformis
The title compound [systematic name: 3,3′,6,6′-tetrahydroxy-4,4′-dimethyl-1,1′-bi(cyclohexa-3,6-diene)-2,2′,5,5′-tetraone], C14H10O8, was isolated from Tremella fuciformis. The molecule has 2 symmetry, with the mid-point of the C—C bond linking the cyclohexadienedione rings located on a twofold rotation axis. In the molecule, the ring is approximately planar, with an r.m.s. deviation of 0.0093 Å, and the two rings make a dihedral angle of 67.89 (5)°. Intermolecular O—H⋯O hydrogen bonding occurs in the crystal structure
Stochastic Linear-quadratic Control Problems with Affine Constraints
In this paper, we investigate the stochastic linear-quadratic control
problems with affine constraints in random coefficients case. With the help of
the Pontryagin maximum principle and stochastic Riccati equation, the dual
problem of original problem is established and the feedback solution of the
optimal control problem is obtained. Under the Slater condition, the
equivalence is proved between the solutions to the original problem and the
ones of the dual problem, and the KKT condition is also provided for the dual
problem. Finally, an invertibility assumption is given for ensuring the
uniqueness of the solutions to the dual problem
The spin measurement of MAXI J1348-630 using the Insight-HXMT data
We report the results of fitting Insight-HXMT data to the black hole X-ray
binary MAXI J1348-430, which was discovered on January 26th, 2019, with the Gas
Slit Camera (GSC) on-board MAXI. Several observations at the beginning of the
first burst were selected, with a total of 10 spectra. From the residuals of
fits using disk plus power law models, X-ray reflection signatures were clearly
visible in some of these observations. We use the state-of the-art relxill
series reflection model to fit six spectra with distinct reflection signatures
and a joint fit to these spectra. In particular, we focus on the results for
the black hole spin values. Assuming Rin = RISCO, the spin parameter is
constrained to be 0.82+0.04-0.03 with 90% confidence level (statistical only).Comment: Revisions to MNRAS are submitted, and comments are welcome
- …