拟-?-渐近非扩张映像的修改的Halpern-Mann-型迭代的强收敛定理及应用

该文的目的是修改拟-φ-渐近非扩张映像的Halpern-Mann-型迭代算法.并证明,仅在一极限条件下,该迭代算法在Banach空间的框架下具有强收敛性.结果改进和推广了文献[4,6-7,11-13]以及其他一些人的最新结果.     

Highly efficient deep blue light emitting devices based on triphenylsilane modified phenanthro[9, 10‐d]imidazole

Highly efficient deep blue fluorescent material (SiPIM) based on phenanthro[9, 10‐d]imidazole (PPI) and triphenylsilane is designed and synthesized. SiPIM presents a narrow deep blue emission, high quantum yield, high thermal stability and good morphological stability. A non‐doped vacuum‐deposited device using SiPIM as active layer achieves an extremely high external quantum efficiency of 6.29% with true deep blue CIE coordinates of (0.163, 0.040). The solution‐processed device is also tried due to the good solubility of SiPIM, which displays a maximum η_ext of 2.40% and CIE coordinates of (0.157, 0.041).     

Synthesis, structure, aggregation-induced emission, self-assembly, and electron mobility of 2,5-bis(triphenylsilylethynyl)-3,4-diphenylsiloles

2,5-Bis(triphenylsilylethynyl)-3,4-diphenylsiloles with different 1,1-substituents [XYSi(CPh)(2) (C-C≡C-SiPh(3))(2)] (Ph=phenyl) were synthesized in high yields by the Sonogashira coupling of 2,5-dibromo-3,4-diphenylsiloles with triphenylsilylacetylene, and two of these were characterized crystallographically. Crystal structures and theoretical calculations showed that the new silole molecules had higher conjugation than 2,5-diarylsiloles. They possessed low HOMO and LUMO energy levels due to the electron-withdrawing effect of the triphenylsilylethynyl groups. Cyclic voltammetry analysis revealed low electron affinities, which were comparable to those of perfluoroarylsiloles. B3LYP/6-31* calculations demonstrated that the new siloles possessed large reorganization energies for electron and hole transfers and high electron mobilities. A mobility of up to 1.2×10(-5) cm(2) V(-1) s(-1) was obtained by the transient electroluminescence method, which was about fivefold higher than that of tris(8-hydroxyquinolinato)aluminum, a widely used electron-transport material, under the same conditions. All of the silole molecules possessed high thermal stability. Although, their solutions were weakly emissive, their nanoparticle suspensions and thin films emitted intense blue-green light upon photoexcitation, demonstrating a novel feature of aggregation-induced emission (AIE). Polarized emissions were observed in the silole crystals. The addition of solvents, which did not dissolve the silole molecules, into silole-containing solutions caused self-assembly of the molecules, which produced macroscopic fibrils with strong light emissions.     

温差电现象物理教学演示仪

利用半导体制冷片既可由温差产生电能输出又可由输入的电能制冷的原理,研制了可用于物理教学演示的温差电现象演示仪。     

Molecular dynamics simulation of multivalent-ion mediated attraction between DNA molecules

All atom molecular dynamics simulations with explicit water were done to study the interaction between two parallel double-stranded DNA molecules in the presence of the multivalent counterions putrescine (2+), spermidine (3+), spermine (4+) and cobalt hexamine (3+). The inter-DNA interaction potential is obtained with the umbrella sampling technique. The attractive force is rationalized in terms of the formation of ion bridges, i.e., multivalent ions which are simultaneously bound to the two opposing DNA molecules. The lifetime of the ion bridges is short on the order of a few nanoseconds.     

Molecular Networking,Network Pharmacology,and Molecular Docking Approaches Employed to Investigate the Changes in Ephedrae Herba before and after Honey-Processing

Raw Ephedrae herba (REH) and honey-processed Ephedrae herba (HEH) were the different decoction pieces of Ephedrae herba (EH). Honey-processing that changes REH into HEH has been shown to relieve cough and asthma to a synergistic extent. However, the chemical markers and the synergistic mechanism of HEH need to be further studied. In this study, the ultra-high performance liquid chromatography coupled with hybrid quadrupole time of flight mass spectrometry (UPLC-Q-TOF-MS) and molecular networking (MN) were used to investigate the chemical composition of REH and HEH, which led to the identification of 92 compounds. A total of 38 differential chemical markers for REH and HEH were identified using principal component analysis (PCA) and orthogonal partial least squares discriminant analysis (OPLS-DA). Network pharmacology suggests that the synergistic effect of HEH in relieving cough and asthma may be due to 31 differential chemical markers acting through 111 biological targets. Among them, four compounds and two targets probably played an important role based on the results of molecular docking. This study enriched our knowledge about the chemical composition of REH and HEH, as well as the synergistic mechanism of HEH.     

Recent Research and Application Prospect of Functional Oligosaccharides on Intestinal Disease Treatment

The intestinal tract is an essential digestive organ of the human body, and damage to the intestinal barrier will lead to various diseases. Functional oligosaccharides are carbohydrates with a low degree of polymerization and exhibit beneficial effects on human intestinal health. Laboratory experiments and clinical studies indicate that functional oligosaccharides repair the damaged intestinal tract and maintain intestinal homeostasis by regulating intestinal barrier function, immune response, and intestinal microbial composition. Functional oligosaccharides treat intestinal disease such as inflammatory bowel disease (IBD) and colorectal cancer (CRC) and have excellent prospects for therapeutic application. Here, we present an overview of the recent research into the effects of functional oligosaccharides on intestinal health.     

MgO粒子掺杂对NdBCO超导块材熔化温度的影响

采用改进后的顶部籽晶熔渗生长(RE+011 TSIG)工艺,通过在固相先驱粉中掺杂不同含量的MgO来有效地提高NdBCO籽晶的熔化温度,从而成功地制备出直径为32 mm的大尺寸单畴SmBCO超导块材.结果表明,MgO的掺杂对NdBCO超导块材的熔化温度有着明显的提高,随着固相先驱粉中MgO掺杂量的增加,Mg²⁺离子逐渐进入到Nd123相的晶格中,当掺杂量达到16 wt%时呈现出饱和状态,且NdBCO超导块材的熔化温度提高近18℃,可有效地抑制在制备SmBCO超导块材的过程中出现的NdBCO籽晶熔化现象.     

四点剪切加载下混凝土裂纹扩展路径研究

混凝土在四点剪切加载条件下,断裂试件失稳基本上为Ⅱ型,随着裂纹的扩展,裂纹会出现分叉、偏斜,就存在断裂路径选择问题,当裂纹由水泥砂浆垂直入侵骨料时,裂纹可能穿过骨料扩展或绕过骨料沿界面扩展该文建立了四点剪切加载条件下,裂纹扩展路径选择模型,并以实验进行验证.     

Sulfone-Embedded Heterocyclic Narrowband Emitters with Strengthened Molecular Rigidity and Suppressed High-Frequency Vibronic Coupling

Sulfone-embedded heterocyclics are of great interest in organic light-emitting diodes (OLEDs), however, exploring highly efficient narrowband emitters based on sulfone-embedded heterocyclics remains challenging. Herein, five emitters with different sulfur valence state and molecular rigidity, namely tP, tCPD, 2tCPD, tPD and tPT, are thoroughly analysed. With restricted twisting of flexible peripheral phenyl by strengthening molecular rigidity, molecular emission spectra can be enormously narrowed. Further, introducing the sulfone group with bending vibration in low-frequency region that suppresses high-frequency vibration, sharp narrow full-widths at half-maximum of 28 and 25 nm are achieved for 2tCPD and tPD, respectively. Maximum external quantum efficiencies of 22.0 % and 27.1 % are successfully realized for 2tCPD- and tPD-based OLED devices. These results offer a novel design strategy for constructing narrowband emitters by introducing sulfone group into a rigid molecular framework.