24 research outputs found
Local Order and Oxygen Ion Conduction Induced High-Temperature Colossal Permittivity in Lead-Free Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>‑Based Systems
In
this study, an effective method is presented to enhance the dielectric
constant at high temperature through Ba<sup>2+</sup>, Mg<sup>2+</sup> codoped nonstoichiometric Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub> (BNT) relaxor ferroelectric ceramics. The temperature dependence
of permittivity, complex impedance spectrum, and conductivity was
investigated to understand the effect of Ba<sup>2+</sup>, Mg<sup>2+</sup> doping on dielectric properties of BNT. The results show that the
value of dielectric constant of (Ba<sub>0.01</sub>Bi<sub>0.5</sub>Na<sub>0.49</sub>)(Ti<sub>0.9</sub>Mg<sub>0.1</sub>)O<sub>3</sub> ceramics increases 2 orders of magnitude with a very broad temperature
range corresponding to pure BNT ceramics. The results of conductivity
and complex impedance spectrum with various temperatures indicate
that the high-temperature dielectric constant is mainly caused by
oxygen ion conductivity and the interfacial effect. The A-site local
order induced by Ba<sup>2+</sup> doping generates dielectric anomalies,
which results in the broadening temperature range for colossal dielectric
constant. The study provides a new method to obtain a colossal dielectric
constant system with a wide temperature range
Silver-Catalyzed Radical Arylphosphorylation of Unactivated Alkenes: Synthesis of 3‑Phosphonoalkyl Indolines
A silver-catalyzed phosphorylation/cyclization
cascade of <i>N</i>-allyl anilines was developed, allowing
direct access to
3-phosphonoalkyl indolines, which were previously obtainable only
via tedious procedures under harsh/toxic conditions. The unactivated
double bond serves as the radical acceptor, whereas H-phosphonates
or -phosphine oxides act as the radical precursor. This protocol features
simple operation, broad substrate scope, and great <i>exo</i> selectivity, and a gram-scale synthesis could be readily carried
out
Additional file 1: Figure S1. of LncRNA H19 promotes the differentiation of bovine skeletal muscle satellite cells by suppressing Sirt1/FoxO1
The expression profiles of H19 in various tissues of cattle at different postnatal stages. The reference genes is 18S RNA. The relative expression levels of H19 in satellite and C2C12 cells during differentiation were calculated according to the method of 2-ÎÎCt. (TIF 498Â kb
Stable Core/Shell CdTe/Mn-CdS Quantum Dots Sensitized Three-Dimensional, Macroporous ZnO Nanosheet Photoelectrode and Their Photoelectrochemical Properties
A novel photoelectrode based on ZnS/CdTe/Mn-CdS/ZnS-sensitized
three-dimensional macroporous ZnO nanosheet (NS) has been prepared
by electrodeposition and successive ion layer adsorption and reaction
(SILAR) method. The photoelectrode performances were significantly
improved through the coupling of the core/shell CdTe/Mn-CdS quantum
dots (QDs) with ZnO NS, and the introduction of the ZnS layer as a
potential barrier. The photocurrent density systematically increases
from ZnO NS (0.45 mA/cm<sup>2</sup>), CdTe/Mn-CdS/ZnO NS (4.98 mA/cm<sup>2</sup>), to ZnS/CdTe/Mn-CdS/ZnS/ZnO (6.23 mA/cm<sup>2</sup>) under
the irradiation of AM 1.5G simulated sunlight. More important, the
ZnS/CdTe/Mn-CdS/ZnS-sensitized ZnO NS photoelectrode provides a remarkable
photoelectrochemical cell efficiency of 4.20% at −0.39 V vs
Ag/AgCl
Asymmetric Conjugated Molecules Based on [1]Benzothieno[3,2‑<i>b</i>][1]benzothiophene for High-Mobility Organic Thin-Film Transistors: Influence of Alkyl Chain Length
Herein,
we report the synthesis and characterization of a series of [1]benzothieno[3,2-<i>b</i>][1]benzothiophene (BTBT)-based asymmetric conjugated molecules,
that is, 2-(5-alkylthiophen-2-yl)[1]benzothieno[3,2-<i>b</i>][1]benzothiophene (BTBT-T<i>n</i>, in which T and <i>n</i> represent thiophene and the number of carbons in the alkyl
group, respectively). All of the molecules with <i>n</i> ≥ 4 show mesomorphism and display smectic A, smectic B (<i>n</i> = 4), or smectic E (<i>n</i> > 4) phases
and then crystalline phases in succession upon cooling from the isotropic
state. Alkyl chain length has a noticeable influence on the microstructures
of vacuum-deposited films and therefore on the performance of the
organic thin-film transistors (OTFTs). All molecules except for 2-(thiophen-2-yl)[1]benzothieno[3,2-<i>b</i>][1]benzothiophene and 2-(5-ethylthiophen-2-yl)[1]benzothieno[3,2-<i>b</i>][1]benzothiophene showed OTFT mobilities above 5 cm<sup>2</sup> V<sup>–1</sup> s<sup>–1</sup>. 2-(5-Hexylthiophen-2-yl)[1]benzothieno[3,2-<i>b</i>][1]benzothiophene and 2-(5-heptylthiophen-2-yl)[1]benzothieno[3,2-<i>b</i>][1]benzothiophene showed the greatest OTFT performance
with reliable hole mobilities (μ) up to 10.5 cm<sup>2</sup> V<sup>–1</sup> s<sup>–1</sup> because they formed highly
ordered and homogeneous films with diminished grain boundaries
Improvement of dysmenorrhea based on vascularity.
<p>Improvement of dysmenorrhea based on vascularity.</p
Improvement of menorrhagia in the vascularity subgroups.
<p>In Fig 6a, the hypervascular subgroup had the highest percentage of short-term improvement in menorrhagia (81.0%, 68/84), followed by the isovascular subgroup (68.3%, 56/82) and the hypovascular subgroup (60.7%, 37/61). A statistically significant difference was observed among the three subgroups (χ2 = 7.491, p = 0.024). In Fig 6b, which shows the long-term effect, the percentages of improved cases in the hypervascular, isovascular, and hypovascular subgroups were 79.4% (54/68), 61.4% (35/57) and 62.2% (28/45), respectively. There was no statistically significant difference among the three subgroups (χ2 = 5.929, p = 0.052).</p
Classification of vascularity abundance for adenomyosis.
<p>2a) An example of a hypervascular adenomyosis lesion, which shows a strong imaging signal; 2b) an Isovascular lesion with a moderate signal; and 2c) a hypovascular lesion with a weak signal.</p
Classification of the distribution equality of the uterus blood supply.
<p>1a) Similar blood supply levels from the left and right uterine arteries, which is defined as an equal blood supply. 1b) Significantly different blood supply levels from the left and right uterine arteries, which is defined as an unequal blood supply.</p