1,253 research outputs found
A study of physicochemical properties, volatile component analysis and antioxidative properties of honey
No full textHoney samples from five different floral origins were analysed through solid phase microextraction (SPME) with objective to identify and compare their volatile organic compound profile. In addition, the levels of water, HMF, free proline, total acidity, diastase activity and sugar content have also been reported. The samples showed adequate water and HMF content. Total phenolics varied from 75.6 to 98.5mg/g, while total flavonoids were comprised between 1.86 and 4.93 mg/g, expressed as quercetin equivalents (the lowest and highest values were also found for Eucalyptus honey and neem honey, respectively). The IC50 value for DPPH has been found to be ranged from 4.97 to 9.45mg/ml. The highest DPPH RSA was found in Eucalyptus honey, followed by mustard honey and neem hone
Search for violation in decays and observation of the Cabibbo-suppressed decay
No full textWe search for violation by measuring a -odd asymmetry in the
Cabibbo-suppressed decay, and
in the Cabibbo-favored and
decays. We use 980 of data collected by the Belle detector running at the KEKB
asymmetric-energy collider. The -violating -odd parameter
is measured to be
and
where the first
uncertainty is statistical and the second is systematic. We also report the
first observation of the Cabibbo-suppressed decay . The branching fraction is measured relative to
that of the analogous Cabibbo-favored decay :
Crystal structure and anisotropic magnetic properties of new ferromagnetic Kondo lattice compound Ce(Cu,Al,Si)2
No full textSingle crystals of the new compound CeCu0.18Al0.24Si1.58 have been grown by high-temperature solution growth method using a eutectic Al-Si mixture as flux. This compound is derived from the binary CeSi2 (tetragonal α-ThSi2-type, Pearson symbol tI12, space group I41/amd) obtained by partial substitution of Si by Cu and Al atoms but showing full occupation of the Si crystal site (8e). While CeSi2 is a well-known valence-fluctuating paramagnetic compound, the CeCu0.18Al0.24Si1.58 phase orders ferromagnetically at TC=9.3 K. At low temperatures the easy-axis of magnetization is along the a-axis, which re-orients itself along the c-axis above 30 K. The presence of hysteresis in the magnetization curve, negative temperature coefficient of resistivity at high temperatures, reduced jump in the heat capacity and a relatively lower entropy released up to the ordering temperature, and enhanced Sommerfeld coefficient (≈100 mJ/mol K2) show that CeCu0.18Al0.24Si1.58 is a Kondo lattice ferromagnetic, moderate heavy fermion compound. Analysis of the high temperature heat capacity data in the paramagnetic region lets us infer that the crystal electric field split doublet levels are located at 178 and 357 K, respectively, and Kondo temperature (8.4 K) is of the order of TC in CeCu0.18Al0.24Si1.58
Search for CP violation in D s + → K S 0 K − π + π + decays using triple and quadruple products
No full textAbstract We perform the first search for CP violation in D s + → K S 0 K − π + π + decays. We use a combined data set from the Belle and Belle II experiments, which study e + e − collisions at center-of-mass energies at or near the Υ(4S) resonance. We use 980 fb −1 of data from Belle and 428 fb −1 of data from Belle II. We measure six CP-violating asymmetries that are based on triple products and quadruple products of the momenta of final-state particles, and also the particles’ helicity angles. We obtain a precision at the level of 0.5% for D + → K S 0 K − π + π + decays, and better than 0.3% for D s + → K S 0 K − π + π + decays. No evidence of CP violation is found. Our results for the triple-product asymmetries are the most precise to date for singly-Cabibbo-suppressed D + decays. Our results for the other asymmetries are the first such measurements performed for charm decays
Measurement of the branching fractions for Cabibbo-suppressed decays D+→K+K−π+π0 and D(s)+→K+π−π+π0 at Belle
No full textWe present measurements of the branching fractions for the singly Cabibbo-suppressed decays D+→K+K−π+π0 and D+s→K+π−π+π0, and the doubly Cabibbo-suppressed decay D+→K+π−π+π0, based on 980 fb−1 of data recorded by the Belle experiment at the KEKB e+e− collider. We measure these modes relative to the Cabibbo-favored modes D+→K−π+π+π0 and D+s→K+K−π+π0. Our results for the ratios of branching fractions are B(D+→K+K−π+π0)/B(D+→K−π+π+π0)=(11.32±0.13±0.26)%, B(D+→K+π−π+π0)/B(D+→K−π+π+π0)=(1.68±0.11±0.03)%, and B(D+s→K+π−π+π0)/B(D+s→K+K−π+π0)=(17.13±0.62±0.51)%, where the uncertainties are statistical and systematic, respectively. The second value corresponds to (5.83±0.42)×tan4θC, where θC is the Cabibbo angle; this value is larger than other measured ratios of branching fractions for a doubly Cabibbo-suppressed charm decay to a Cabibbo-favored decay. Multiplying these results by world average values for B(D+→K−π+π+π0) and B(D+s→K+K−π+π0) yields B(D+→K+K−π+π0)=(7.08±0.08±0.16±0.20)×10^−3, B(D+→K+π−π+π0)=(1.05±0.07±0.02±0.03)×10^−3, and B(D+s→K+π−π+π0)=(9.44±0.34±0.28±0.32)×10^−3, where the third uncertainty is due to the branching fraction of the normalization mode. The first two results are consistent with, but more precise than, the current world averages. The last result is the first measurement of this branching fraction
Synthesis, Crystal and Electronic Structure of the Quaternary Magnetic EuTAl4Si2 (T = Rh and Ir) Compounds
No full textSingle crystals of the quaternary europium compounds
EuRhAl4Si2 and EuIrAl4Si2 were synthesized by using the
Al−Si binary eutectic as a flux. The structure of the two quaternary compounds has been refined by single crystal X-ray diffraction. Both compounds are stoichiometric and adopt an ordered derivative of the ternary KCu4S3 structure type (tetragonal tP8, P4/mmm). The two compounds reported here represent the first example of a quaternary and truly stoichiometric 1:1:4:2 phase crystallizing with this structure type. In light of our present results, the structure of the BaMg4Si3 compound given in literature as representing a new
prototype is actually isotypic with the KCu4S3 structure. Local spin density approximation including the Hubbard U parameter (LSDA + U) calculations show that Eu ions are in the divalent state, with a significant hybridization between the Eu 5d, Rh (Ir) 4d (5d), Si 3p and Al 3p states. Magnetic susceptibility measured along the [001] direction confirms the divalent nature of the Eu ions in EuRhAl4Si2 and EuIrAl4Si2, which order magnetically near ∼11 and ∼15 K, respectively
Topological AdS black holes surrounded by Chaplygin dark fluid: From stability to geometrothermodynamic analysis
No full textImplementing the concept of Dark Fluid with a Chaplygin-like equation of
state within General Relativity, we construct a new higher-dimensional, static,
and spherically symmetric anti-de Sitter (AdS) black hole solution. Energy
conditions are explored alongside curvature singularity tools. The inspection
at the level of the phase structure and critical behavior is carried out
in the context of the extended phase space, where the cosmological constant
appears as pressure. Our findings disclose non-trivial similarities between the
small/large phase transition of AdS black holes surrounded by Chaplygin dark
fluid and van der Waals systems' liquid/gas phase transition. This analysis
offers insights into the physical interpretation of the diagram and
identifies critical exponents that reveal the scaling behavior of thermodynamic
quantities close to criticality in a universal manner. We finally deepen our
understanding of the thermodynamic properties and microstructure of AdS black
holes by leveraging the geometrothermodynamic formalism. Specifically, we
employ tools, including Weinhold, Ruppeiner, Hendi-Panahiyan-Eslam-Momennia
(HPEM) and Quevedo classes I and II. We show that each class of metrics
predicts either the physical limitation point and/or the phase-transition
critical points, with HPEM and Quevedo formulations providing richer
information about the phase transitions. Altogether, this study contributes to
advancing our knowledge of the role of Chaplygin gas in General Relativity and
thoroughly examining the thermodynamic phase structure of high-dimensional AdS
black holes under extreme conditions.Comment: 26 pages, 11 labeled figure, accepted for publication in Phys. Dark.
Uni
Measurement of the time-integrated CP asymmetry in decays using Belle and Belle II data
No full textWe measure the time-integrated CP asymmetry in decays reconstructed in events collected by the Belle and Belle II experiments. The corresponding data samples have integrated luminosities of 980 fb and 428 fb, respectively. The decays are required to originate from the decay, which determines the charm flavor at production time. A control sample of decays is used to correct for production and detection asymmetries. The result, , is consistent with previous determinations and with CP symmetry
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No full textMeasurement of the branching fractions of → D(*)K− and → D(*) decays at Belle II
No full textWe present measurements of the branching fractions of eight B0 → D(∗)+K-K(∗)0(S), B- → D(∗)0 K− K(*)0(S) decay channels. The results are based on data from SuperKEKB electron-positron collisions at the Y(4S) resonance collected with the Belle II detector, corresponding to an integrated luminosity of 362 fb^−1 . The event yields are extracted from fits to the distributions of the difference between expected and observed B meson energy, and are efficiency-corrected as a function of m(K− K(*)0(S) ) and m(D(∗) K(*)0(S) ) in order to avoid dependence on the decay model. These results include the first observation of B0 → D+ K− K0S , B− → D∗0 K−K0S, and B0 → D∗+ K− K0S decays and a significant improvement in the precision of the other channels compared to previous measurements. The helicity-angle distributions and the invariant mass distributions of the K − K(*)0(S) systems are compatible with quasi-two-body decays via a resonant transition with spin-parity JP = 1− for the K − K0S systems and JP = 1+ for the K− K∗0 systems. We also present measurements of the branching fractions of four B0 → D(∗)+ D-s , B− → D(∗)0 D-s decay channels with a
precision compatible to the current world averages
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