Based on an e+e− collision data sample corresponding to an integrated luminosity of 567 pb−1 taken at the center-of-mass energy of s=4.6 GeV with the BESIII detector, we measure the absolute ...branching fraction of the inclusive decay Λc+→Λ+X to be B(Λc+→Λ+X)=(38.2−2.2+2.8±0.9)% using the double-tag method, where X refers to any possible final state particles. In addition, we search for direct CP violation in the charge asymmetry of this inclusive decay for the first time, and obtain ACP≡B(Λc+→Λ+X)−B(Λ¯c−→Λ¯+X)/B(Λc+→Λ+X)+B(Λ¯c−→Λ¯+X)=(2.1−6.6+7.0±1.6)%, a statistically limited result with no evidence of CP violation.
Full text
Available for:
CMK, CTK, FMFMET, NUK, UL
The hot deformation behavior of fine grained Inconel 718 superalloy was investigated by compression test in the temperature range of 950 to 1150 °C and strain rate range of 0.1–10 s−1. At low ...temperatures and high strain rates, the flow stress rapidly increased to a peak value with increasing strain at the initial stage of deformation. After attaining peak stress, the flow curves exhibited an obvious phenomenon of flow softening. At high temperatures and low strain rates, the flow curves exhibited typical characteristics of dynamic recrystallization. A strain-compensated Arrhenius type constitutive equation was used to predict the flow behavior of the alloy. The relationship between the material constants (i.e. α, Q, n and lnA) in Arrhenius-type constitutive equation and true strain was established by a fifth order polynomial. The flow stress values predicted by the developed constitutive equations were in good agreement with the experimental values, showing that the developed constitutive equation can give a precise estimate for the flow stress during hot deformation. The processing maps of fine grained Inconel 718 superalloy for hot working at different strains were constructed. The optimum processing parameters were determined to be the deformation temperature of 1100 °C and strain rate of 0.1 s−1.
•Hot deformation behavior of fine grained Inconel 718 superalloy was investigated.•Flow behavior was predict by a strain-compensated Arrhenius type constitutive equation.•Processing map was used to predict flow instability and optimize process parameters.•The optimum processing parameter were determined to be 1100 °C and 0.1 s−1.
The study ofCoNb2O6sits at the confluence of simplicity and complexity: on one hand, the model for Ising chains—the building blocks ofCoNb2O6—in a transverse field can be exactly solved and, thus, ...serves as an archetype of quantum criticality; on the other hand, the weak but nonzero interchain coupling adds geometric frustration to the stage, substantially complicating the phase diagram. Here we utilize low-temperature specific heat and thermal conductivity measurements to study the low-lying magnetic excitations inCoNb2O6and its spin-1 analogNiNb2O6. The thermal conductivity is found to be suppressed around the quantum critical point, where the specific heat is enhanced due to gapless magnetic excitations, pointing to the localized nature of the latter. These results highlight the predominant role of frustration in determining the quantum critical magnetic excitations of spin chains, which may furthermore underlie the remarkable similarities between the phenomenology of these spin-1/2and spin-1 systems.
Full text
Available for:
CMK, CTK, FMFMET, NUK, UL
Using a data sample of ${e}^{+}{e}^{{-}}$ collisions corresponding to an integrated luminosity of $567\text{ }\text{ }{\mathrm{pb}}^{{-}1}$ collected at a center-of-mass energy of $\sqrt{s}=4.6\text{ ...}\text{ }\mathrm{GeV}$ with the BESIII detector, we measure the absolute branching fraction of the inclusive semileptonic ${\mathrm{{\Lambda}}}_{c}^{+}$ decay with a double-tag method. We obtain $\mathcal{B}({\mathrm{{\Lambda}}}_{c}^{+}{\rightarrow}X{e}^{+}{{\nu}}_{e})=(3.95\pm{}0.34\pm{}0.09)%$, where the first uncertainty is statistical and the second systematic. Using the known ${\mathrm{{\Lambda}}}_{c}^{+}$ lifetime and the charge-averaged semileptonic decay width of nonstrange charmed mesons (${D}^{0}$ and ${D}^{+}$), we obtain the ratio of the inclusive semileptonic decay widths $\mathrm{{\Gamma}}({\mathrm{{\Lambda}}}_{c}^{+}{\rightarrow}X{e}^{+}{{\nu}}_{e})/\overline{\mathrm{{\Gamma}}}(D{\rightarrow}X{e}^{+}{{\nu}}_{e})=1.26\pm{}0.12$.
Full text
Available for:
CMK, CTK, FMFMET, NUK, UL
A
bstract
With data samples collected with the BESIII detector at seven energy points at
s
= 3
.
68
−
3
.
71 GeV, corresponding to an integrated luminosity of 333 pb
−
1
, we present a study of the Λ ...transverse polarization in the
e
+
e
−
→
Λ
Λ
¯
reaction. The significance of polarization by combining the seven energy points is found to be 2.6
σ
including the systematic uncertainty, which implies a non-zero phase between the transition amplitudes of the
Λ
Λ
¯
helicity states. The modulus ratio and the relative phase of EM-
psionic
form factors combined with all energy points are measured to be
R
Ψ
=
0.71
−
0.10
+
0.10
±
0.03 and ∆Φ
Ψ
=
23
−
8.0
+
8.8
±
1.6
°
, where the first uncertainties are statistical and the second systematic.
In this study, the performance of titanium tetrachloride (TiCl
4) coagulation and flocculation is compared with commonly used coagulants such as aluminum sulfate (Al
2(SO
4)
3), polyaluminum chloride ...(PACl), iron chloride (FeCl
3), and polyferric sulfate (PFS) in terms of water quality parameters and floc properties. TiCl
4 flocculation achieved higher removal of UV
254 (98%), dissolved organic carbon (DOC) (84%) and turbidity (93%) than other conventional coagulants. Charge neutralization and physical entrapment of colloids within coagulant precipitates and adsorption, seemed to play a significant role during TiCl
4 flocculation, while the main mechanism for conventional coagulants was bridge-aggregation and adsorption. The aggregated flocs after TiCl
4 flocculation showed the fastest growth rate compared to the other coagulants, with the largest floc size (801
μm) occurring within 8
min. The floc strength factor of PACl, Al
2(SO
4)
3, PFS, FeCl
3 and TiCl
4 was 34, 30, 29, 26 and 29, respectively, while the floc recovery factor of the TiCl
4 coagulant was the lowest. Based on the results of the above study, it is concluded that the TiCl
4 flocculation can reduce the hydraulic retention time of slow and rapid mixing, however, careful handling of sludge is required due to the low recoverability of the aggregated floc.
Display omitted
Selective laser melting (SLM) is widely used to process Inconel 625 alloy powders to manufacture functional components. The SLM process parameters significantly affect the bonding of ...melting powders and the substrate or deposited layer, the geometry of melt pool, and the microstructure of end-use components. In this study, single track SLM experiments were carried out to investigate the melt pool geometry on a lab-made facility with a wide range of laser power and scan speed and the fixed laser beam diameter and layer thickness. A process map for SLM of Inconel 625 alloy was developed. Four types of single track formation have been identified and characterized. The contact angle of the melt pool tends to decrease with the increase of laser power. The track height, surface roughness, and contact angle were found to be independent of scan speed. Surface integrity of the tracks was also analyzed in terms of surface roughness, microstructure, grain size, and microhardness. In addition, the influence of process parameters on the microstructure in the tracks was investigated. A typical columnar dendrite microstructure was observed in the tracks due to the rapid cooling process. At high laser powers, larger primary dendritic arm spacing was formed in the tracks, which has higher hardness than that of the heat affected zone (HAZ).
Simultaneous detection of multiple trace cancer associated serum miRNA biomarkers is considered as a feasible method for early cancer screening and diagnosis. In the present work, an ultrasensitive ...SERS sensor was prepared based on an Ag nanorod array SERS substrate by assembling special hairpin-shaped molecular beacons (MBs) for the detection of multiple lung cancer-related miRNA biomarkers. The portable SERS sensor exhibits excellent performance for the qualitative and quantitative detection of miRNAs, with advantages of ultra-sensitivity, good specificity, uniformity, reproducibility and stability, as well as remarkable reusability. By monitoring the SERS signal quenching of the MBs in the presence of target miRNA biomarkers, three lung cancer related-miRNAs (miRNA-21, miRNA-486, and miRNA-375) in buffer and human serum were simultaneously assayed using the SERS sensor array, and the limits of detection of the three miRNAs in human serum are 393 aM, 176 aM, and 144 aM, respectively. The reliable results demonstrate that the proposed SERS sensor array can be a promising candidate with great potential for the screening and clinical diagnosis of cancer in the early stage.
ABSTRACT
We report the phase-connected timing ephemeris, polarization pulse profiles, Faraday rotation measurements, and Rotating-Vector-Model (RVM) fitting results of 12 millisecond pulsars (MSPs) ...discovered with the Five-hundred-meter Aperture Spherical radio Telescope (FAST) in the Commensal Radio Astronomy FAST survey (CRAFTS). The timing campaigns were carried out with FAST and Arecibo over 3 yr. 11 of the 12 pulsars are in neutron star–white dwarf binary systems, with orbital periods between 2.4 and 100 d. 10 of them have spin periods, companion masses, and orbital eccentricities that are consistent with the theoretical expectations for MSP–Helium white dwarf (He WD) systems. The last binary pulsar (PSR J1912−0952) has a significantly smaller spin frequency and a smaller companion mass, the latter could be caused by a low orbital inclination for the system. Its orbital period of 29 d is well within the range of orbital periods where some MSP–He WD systems have shown anomalous eccentricities, however, the eccentricity of PSR J1912−0952 is typical of what one finds for the remaining MSP–He WD systems.
PDF
