Shape-controlled Fe3O4 nanostructure was prepared using polyethylene glycol as a template in a water system at room temperature. Different morphologies of Fe3O4 nanostructures, including spherical, ...cubic, rod-like, and dendritic nanostructure, were obtained by carefully controlling the concentration of the Fe3+, Fe2+, and the molecular weight of the polyethylene glycol. TEM images, XRD patterns and magnetic properties were used to characterise the final product. This procedure for Fe3O4 nanostructure fabrication offers the possibility of a generalised approach to the production of single and complex nanocrystalline oxides with tunable morphology.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
A
bstract
Utilizing 7
.
33 fb
−
1
of
e
+
e
−
collision data taken at the center-of-mass energies of 4.128, 4.157, 4.178, 4.189, 4.199, 4.209, 4.219, and 4.226 GeV with the BESIII detector, the ...branching fraction of the leptonic decay
D
s
+
→ τ
+
ν
τ
via
τ
+
→ μ
+
ν
μ
ν
¯
τ
is measured to be
B
D
s
+
→
τ
+
ν
τ
= (5
.
37
±
0
.
17
stat
±
0
.
15
syst
)%. Combining this branching fraction with the world averages of the measurements of the masses of
τ
+
and
D
s
+
as well as the lifetime of
D
s
+
, we extract the product of the decay constant of
D
s
+
and the
c → s
Cabibbo-Kobayashi-Maskawa matrix element to be
f
D
s
+
|V
cs
|
= (246
.
7
±
3
.
9
stat
±
3
.
6
syst
) MeV. Taking
|V
cs
|
from a global fit in the standard model we obtain
f
D
s
+
= (253
.
4
±
4
.
0
stat
±
3
.
7
syst
) MeV. Conversely, taking
f
D
s
+
from lattice quantum chromodynamics calculations, we obtain
|V
cs
|
= 0
.
987
±
0
.
016
stat
±
0
.
014
syst
.
We observe the process ψ(3686)→p$\overline{p}$η' for the first time, with a statistical significance higher than 10σ, and measure the branching fraction of J/ψ→p$\overline{p}$η' with an improved ...accuracy compared to earlier studies. The measurements are based on 4.48 × 108 ψ(3686) and 1.31 × 109 J/ψ events collected by the BESIII detector operating at the BEPCII. The branching fractions are determined to be $\mathcal{B(ψ(3686)→p\overline{p}η')}$ = (1.10 ± 0.10 ± 0.08)×10-5 and $\mathcal{B(J/ψ →p\overline{p}η')}$ = (1.26 ± 0.02 ± 0.07) ×10-4, where the first uncertainties are statistical and the second ones systematic. Also, the η- η' mixing angle is determined to be -24° ± 11° based on ψ(3686)→p$\overline{p}$η', and -24° ± 9° based on J/ψ→p$\overline{p}$η', respectively.
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CMK, CTK, FMFMET, IJS, NUK, PNG, UM
•Propose a theory for stocky beams.•The beams are characterized by beam-like stresses, but not by span/width ratios.•Propose a new Nodal Line Method for thin- or thick- walled stocky beams.•The shear ...lag problem of a box girder of varying thickness is solved.•The normal stress of a box girder due to restrained torsion is revealed.•The shear stress of a box girder due to shearing forces is discovered.
The nodal-line method (NLM) is proposed for treating the wide-flange stocky thin- or thick-walled beams featured by (1) clear longitudinal axis, (2) low length/width ratio (≤ 3), and (3) three beamlike stress components. The nodal lines parallel to the axis are distributed on all sides (for both thin and thick walls) plus the interior (for thick walls only) of the beam, and used as the reference frame for imposing the 3D displacement field. The axial and transverse displacements of the nodal lines are taken as the unknown functions and used along with interpolation functions to describe the displacement field. By the principle of minimum potential energy, a set of ordinary differential equations (ODE) and boundary conditions are established for the beam, which are solved by existing ODE solvers. The displacements and stresses of the beam so computed can duly account for the shear-lag effect of wide-flange box beams. For long and medium-long beams, the stocky beam reduces to the Bernoulli-Euler or Timoshenko beam, depending on the range of slenderness ratios. Either asymmetric bending, restrained torsion, or cross-sectional warping of box girders can be easily treated. More phenomena will be explored in the exemplar study of various box girders.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK, ZRSKP
Using e+e- collision data corresponding to an integrated luminosity of 2.93 fb-1 taken at a center-of-mass energy of 3.773 GeV with the BESIII detector, we find that the absolute branching fractions ...$\mathcal{B(D^+→K_S^0K^+)}$ = (3.02 ±0.09 ± 0.08) × 10-3, $\mathcal{B(D^+→K_S^0K^+ \pi^0)}$ = (5.07 ± 0.19 ±0.23) × 10-3, $\mathcal{B(D^+→K_L^0K^+)}$ = (3.21±0.11±0.11)×10-3, and $\mathcal{B(D^+→K_L^0K^+\pi^0)}$ = (5.24±0.22±0.22)×10-3, where the first and second uncertainties are statistical and systematic, respectively. The branching fraction $\mathcal{B(D^+→K_S^0K^+)}$ is consistent with the world average value and the other three branching fractions are measured for the first time. We additionally measure the CP asymmetries for the four decays and do not find a significant deviation from zero.
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Decays $\mathcal{x_{cj}}$ (J = 0, 1, 2)→ωφ are studied using (448.1 ± 2.9) × 106ψ(3686) events collected with the BESIII detector in 2009 and 2012. Futhermore, In addition to the previously ...established $\mathcal{x_{c0}}$→ωΦ, the first observation of $\mathcal{x_{c1}}$→ωΦ is reported in this paper. The measured product branching fractions are $\mathcal{B(ψ(3686)→γχ_{c0}) × B(χ_{c0}→ωΦ)}$ = (13.83 ± 0.70 ± 1.01) × 10-6 and $\mathcal{B(ψ(3686)→γχ_{c1}) × B(χ_{c1}→ωΦ)}$ = (2.67 ± 0.31 ± 0.27) × 10-6, and the absolute branching fractions are $\mathcal{B(x_{c0}→ωΦ)}$ = (13.84 ± 0.70 ± 1.08) × 10-5 and $\mathcal{B(x_{c1}→ωΦ)}$ = (2.80 ± 0.32 ± 0.30) × 10-5. Furthermore, we find a strong evidence for $\mathcal{x_{c2}}$→ωΦ with a statistical significance of 4.8σ, and the corresponding product and absolute branching fractions are measured to be$\mathcal{B(ψ(3686)→γχ_{c2})×B(χ_{c2}→ωΦ)}$ = (0.91 ± 0.23 ± 0.12) × 10-6 and $\mathcal{B(x_{c2}→ωΦ)}$ = (1.00 ± 0.25 ± 0.14) × 10-5. Here, the first errors are statistical and the second ones systematic.
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H2AX, a histone H2A variant, has a key role in the cellular response to DNA double-strand breaks (DSBs). H2AX senses DSBs through rapid serine 139 phosphorylation, concurrently leading to the ...formation of phospho-(γ)H2AX foci with various proteins. However, in the cells with different sensitivity to ionizing radiation (IR)-induced DSBs, still incomplete are those specific proteins selectively recruited by γH2AX to decide different cell fates. Because the abundance of γH2AX indicates the extent of DSBs, we first identified IR-induced dose-dependent H2AX-interacting partners and found that Bcl-2-associated transcription factor 1 (BCLAF1/Btf) showed enhanced association with γH2AX only under high-dose radiation. In acutely irradiated cells, BCLAF1 promoted apoptosis of irreparable cells through disturbing p21-mediated inhibition of Caspase/cyclin E-dependent, mitochondrial-mediated pathways. Meanwhile, BCLAF1 co-localized with γH2AX foci in nuclei and stabilized the Ku70/DNA-PKcs complex therein, facilitating non-homologous end joining (NHEJ)-based DSB repair in surviving cells. In tumor cells, BCLAF1 was intrinsically suppressed, leading to formation of anti-apoptotic Ku70-Bax complexes and disruption of Ku70/DNA-PKcs complexes, all of which contribute to tumor-associated apoptotic resistance and cell survival with defective NHEJ DNA repair. For the first time, our studies reveal that, based on the extent of DNA damage, BCLAF1 is involved in the γH2AX-mediated regulation of apoptosis and DNA repair, and is a γH2AX-interacting tumor suppressor.
Abstract We report the first measurement of the absolute branching fraction of the inclusive decay $$\Lambda _c^+ \rightarrow K_S^0X$$ Λ c + → K S 0 X . The analysis is performed using an $$e^+e^-$$ ...e + e - collision data sample corresponding to an integrated luminosity of 567 $$\hbox {pb}^{-1}$$ pb - 1 taken at $$\sqrt{s}$$ s = 4.6 GeV with the BESIII detector. Using eleven Cabibbo-favored $${\bar{\Lambda }}_c^-$$ Λ ¯ c - decay modes and the double-tag technique, this absolute branching fraction is measured to be $${\mathcal {B}}(\Lambda _c^+ \rightarrow K_S^0X)=(9.9\pm 0.6\pm 0.4)\%$$ B ( Λ c + → K S 0 X ) = ( 9.9 ± 0.6 ± 0.4 ) % , where the first uncertainty is statistical and the second systematic. The relative deviation between the branching fractions for the inclusive decay and the observed exclusive decays is $$(18.7\pm 8.3)\%$$ ( 18.7 ± 8.3 ) % , which indicates that there may be some unobserved decay modes with a neutron or excited baryons in the final state.
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DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
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