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

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    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

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    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

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    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-ΔΔCt. (TIF 498 kb

    Stable Core/Shell CdTe/Mn-CdS Quantum Dots Sensitized Three-Dimensional, Macroporous ZnO Nanosheet Photoelectrode and Their Photoelectrochemical Properties

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    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

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    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 menorrhagia in the vascularity subgroups.

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    <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.

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    <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.

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    <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
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