4,331 research outputs found
Analysis of double- production in decay at next-to-leading-order QCD accuracy
In this article, we study in detail the double- yield through
decay at the next-to-leading-order (NLO) QCD accuracy within the
nonrelativistic QCD factorization. At the tree level, the pure QCD diagrams
predict a branching ratio of ;
however, the inclusion of the QED diagrams would augment this prediction by
approximately 2-3 orders of magnitude. After incorporating the QCD corrections,
the QCD results exhibit a considerable increase, whereas the QED results
undergo a substantial reduction. Combining the QCD and QED contributions at NLO
in , it is observed that the prediction of , which
displays a fairly steady dependence on the renormalization scale, is
significantly lower than the upper limits released by CMS.Comment: v2: 15 pages, 3 figures, and 2 tables. Matches with published version
in JHE
Effect of Astragalus membranaceus (Fisch) Bunge extract on streptozocin-induced diabetic in rats
Purpose: To investigate the effect of Astragalus membranaceus (Fisch.) Bunge. extract (AMBE) on streptozotocin-induced diabetic rats.Methods: The aqueous extract of AMB was obtained by steeping the dried Astragalus membranaceus (Fisch.) Bunge. in water at 60 oC three times, each for 1 h, before first drying in an oven at 100 oC and then freeze-drying the last extract thus obtained. Diabete model rats was induced by a single intraperitoneal injection of a freshly prepared solution of streptozotocin (50 mg/kg). The rats were randomly divided into 6 groups of ten rats each: negative control group, normal control group, reference group (glibenclamide1 mg/kgbody weight) as well as AMB extract groups, namely, 40, 80 and 160 mg/kg body weight. Antihyperglycemic effect was measured by blood glucose and plasma insulin levels. Oxidative stress was evaluated in liver and kidney by antioxidant markers, viz, lipidperoxidation (LPO), superoxide dismutase (SOD), reduced glutathione (GSH), glutathione peroxidase (GPx) and catalase (CAT), while blood serum levels of creatinine and urea were also determined in both diabetic control and treated rats.Results: Compared with diabetic rats, oral administration of AMBE at a concentration of 160 mg/kg daily for 30 days showed a significant decrease in fasting blood glucose (109.438 ± 3.52, p < 0.05) and increased insulin level (13.96 ± 0.74, p < 0.05). Furthermore, it significantly reduced biochemical parameters (serum creatinine, 0.86 ± 0.29, p < 0.05) and serum urea (45.14 ± 1.79, p < 0.05). The treatment also resulted in significant increase in GSH (49.21 ± 2.59, p < 0.05), GPx (11.96 ± 1.16, p < 0.05), SOD (14.13 ± 0.49, p < 0.05), CAT (83.25 ± 3.14, p < 0.05) level in the liver and kidney of diabetic rats.Conclusion: The results suggest that AMBE may effectively normalize impaired antioxidant status in streptozotocin-induced diabetes in a dose-dependent manner. AMBE has a protective effect against lipid peroxidation by scavenging free radicals and is thus capable of reducing the risk of diabetic complications.Keywords: Astragalus membranaceus, Diabetic, Antihyperglycemic, Antioxidant Oxidative stress, Fasting blood glucos
Ethyl 4-anilino-3-nitrobenzoate
In the title compound, C15H14N2O4, the aromatic rings are oriented at a dihedral angle of 78.33 (3)°. An intraÂmolecular N—H⋯O hydrogen bond results in a non-planar six-membered ring with a flattened-boat conformation. In the crystal structure, interÂmolecular N—H⋯O hydrogen bonds link the molÂecules. π–π contacts between the phenyl rings and both the phenyl and benzene rings, [centroid–centroid distances = 3.841 (3) and 3.961 (3) Å] may further stabilize the structure
4-Chloro-3-nitroÂbenzonitrile
In the title compound, C7H3ClN2O2, the Cl, C and N atoms are coplanar with the aromatic ring. In the crystal structure, weak interÂmolecular C—H⋯O and C—H⋯N hydrogen bonds link the molÂecules. The π–π contact between the benzene rings, [centroid–centroid distances = 3.912 (3) Å] may further stabilize the structure
Pre-Attentive Processing of Mandarin Tone and Intonation: Evidence from Event-Related Potentials
Possible origin of Triticum petropavlovskyi based on cytological analyses of crosses between T. petropavlovskyi and tetraploid, hexaploid, and synthetic hexaploid (SHW-DPW) wheat accessions
Intraspecific hybridization between Triticum petropavlovskyi Udacz. et Migusch., synthetic hexaploid wheat (SHW-DPW), and tetraploid and hexaploid wheat, was performed to collect data on seed set, fertility of F1 hybrid, and meiotic pairing configuration, aiming to evaluate the possible origin of T. petropavlovskyi. Our data showed that (1) seed set of crosses T. petropavlovskyi × T. polonicum and T. petropavlovskyi × T. aestivum cv. Chinese Spring was significantly high; (2) fertility of hybrids T. petropavlovskyi × T. polonicum and T. petropavlovskyi × T. aestivum ssp. yunnanense was higher than that of the other hybrids; (3) fertility of F1 hybrids SHW-DPW × T. dicoccoides and SHW-DPW×T. aestivum ssp. tibetanum was significantly high; and (4) c-value of T. petropavlovskyi × T. polonicum and T. petropavlovskyi × T. aestivum cv. Changning white wheat was also significantly high. The results indicate that the probable origin of T. petropavlovskyi is divergence from a natural cross between T. aestivum and T. polonicum, via either spontaneous introgression or breeding effort
Newton-Cartan Gravity and Torsion
We compare the gauging of the Bargmann algebra, for the case of arbitrary
torsion, with the result that one obtains from a null-reduction of General
Relativity. Whereas the two procedures lead to the same result for
Newton-Cartan geometry with arbitrary torsion, the null-reduction of the
Einstein equations necessarily leads to Newton-Cartan gravity with zero
torsion. We show, for three space-time dimensions, how Newton-Cartan gravity
with arbitrary torsion can be obtained by starting from a Schroedinger field
theory with dynamical exponent z=2 for a complex compensating scalar and next
coupling this field theory to a z=2 Schroedinger geometry with arbitrary
torsion. The latter theory can be obtained from either a gauging of the
Schroedinger algebra, for arbitrary torsion, or from a null-reduction of
conformal gravity.Comment: 21 page
Photometric observations of flares on AD Leo from GWAC-F30 and TESS
We observed active M dwarf star AD Leo for 146 hr in photometry by GWAC-F30
and also analyzed 528-hr photometric data of the star from TESS. A total of 9
and 70 flares are detected from GWAC-F30 and TESS, respectively. Flare
durations, amplitudes and energies are calculated. The distributions of the
three properties and FFDs are given. Within the same energy range of flares,
the FFDs of AD Leo obtained in this research and the previous study are
basically consistent, which suggests that the magnetic activity of this star
has not significantly changed compared to that decades ago. Comparing with the
average FFD of M-type stars, AD Leo's FFD is twice higher, indicating that its
magnetic activity is more active than that of the average level of the M-type.
Based on TESS light curve, AD Leo's rotation period is calculated as
2.21 day , supporting the result given in previous
research. During the decay phase of the most energetic flare from TESS, we
identified QPPs and determined a 26.5-min oscillation period, which is
currently the longest period for AD Leo, suggesting that long periodic physical
process existed during flare of this star
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