Synthesis of carbon-coated LiMn0.8Fe0.2PO4 materials via an aqueous rheological phase-assisted solid-state method

Journal of Solid State Electrochemistry - Synthesis method is crucial to the improved electrochemical performances of LiMnPO4 materials with poor electronic and ionic conductivity for large-scale...     

Highlighting the possible secondary interactions in the role of balhimycin and its analogues for enantiorecognition in capillary electrophoresis

It is believed that the enantiorecognition mechanism based on macrocyclic antibiotics involves multimodal interactions via hydrogen bonding, π–π interaction, steric hindrance, hydrophobic interaction and so on. A variety of enantiomeric N-benzoylated amino acids were separated using balhimycin (A) or its analogues bromobalhimycin (B) and dechlorobalhimycin (C) as chiral mobile phase additive using a CE method, which combined the partial filling technique with the dynamic coating technique and the co-EOF electrophoresis technique. The enantioresolution and the migration time were highly relevant to the structure of analytes, especially to the substitutions on the N-tagged benzoyl moiety of the amino acids. A steric effect and π–π interaction based mechanism is proposed in order to explain some observed enantioresolution differences between positional isomers. Notably dechlorobalhimycin exhibited the best enantioresolution for several N-benzoylated derivatives of leucine, which was rarely observed for N-dansylated amino acid derivatives. The hydrophobicity difference of the aglycone pocket among three chiral selectors was assumed to account for this behaviour.     

Determination of D,L‐serine in midbrain of Parkinson's disease mouse by capillary electrophoresis with in‐column light‐emitting diode induced fluorescence detection

A capillary electrophoresis method with in‐column light‐emitting diode induced fluorescence detection is described for simultaneous determination of D ,L ‐serine in the midbrain of a Parkinson's disease mouse. D ,L ‐Serine was derivatized with fluorescein isothiocyanate, and chiral separation and determination of D ,L ‐serine derivatives were performed on a laboratory‐built capillary electrophoresis system with in‐column light‐emitting diode induced fluorescence detector using γ‐cyclodextrin as chiral selector. Using this method, the levels of D ‐ and L ‐serine in the midbrains of Parkinson's disease mice were determined. When compared to controls, the levels of D ‐ and L ‐serine showed significant differences. The result suggested that the biosynthesis and the transportation of endogenous D ,L ‐serine may participate in Parkinson's disease pathogenesis.     

含丙氧甲基冠醚侧基的线型聚甲基硅氧烷液膜离子传输性能

烯丙氧甲基１５－冠－５和１８－冠－６与甲基二氯硅烷进行硅氢加成，再与端羟基硅油反应，三甲基氯硅烷封端，得到两种冠醚含量适中、结构确定的含冠醚侧基的线型聚甲基硅氧烷．以两种聚合物冠醚为流动载体，采用大块液膜装置，研究了载体和阳离子的种类、成盐阴离子的种类、载体的浓度及盐的浓度对离子迁移的影响，并考察了膜的稳定性．     

对使用主成分进行绩效指标值排名的讨论

对《基于数据的Goodgrant基金最优投资策略》一文使用主成分分析进行综合评价,对候选学校绩效指标值排名进行了探讨。首先,综合前人研究与本题实际,指出使用主成分分析进行综合评价存在的争议与不足;然后,分别建立TOPSIS模型和综合评价模型对候选学校的绩效指标值进行排名,并对不同方法得到的结果进行对比。结果表明,TOPSIS模型和综合评价模型得到的排名具有高度一致性,前50名重合率达98%,而与主成分分析综合评价的重合率仅有6%,说明使用TOPSIS等传统评价模型对候选学校绩效指标值进行排名更合适。     

N-Heterocyclic carbene-mediated oxidative esterification of aldehydes: ester formation and mechanistic studies

An unexpected N-heterocyclic carbene-catalyzed esterification of α,β-unsaturated aldehydes including aromatic aldehydes with reactive cinnamyl bromides in the presence of air oxygen or MnO(2) as an oxidant is described. In the presence of oxygen, halogenated and electron-deficient aldehydes react smoothly to furnish esters in good yields. Great efforts have been made on mechanistic studies to deduce a plausible mechanism, based on the experimental results and isotopic labeling experiment.     

空温式翅片管气化器非稳态结霜速率分析

观测了某实际运营的空温式翅片管气化器附近湿空气流动状态。基于热力学理论和湿空气流动状态建立了空温式翅片管气化器表面非稳态结霜模型,推导了非稳态结霜速率的关系式,分析了不同工况下非稳态结霜速率影响因素。非稳态结霜速率随湿空气温度、相对湿度和气流速度增加而增加,其主要影响因素为湿空气温度和相对湿度,而气流速度影响相对较小。非稳态结霜速率分析为精确计算空温式翅片管气化器传热特性提供了一定理论依据。     

Solar-Driven CO2 Conversion via Optimized Photothermal Catalysis in a Lotus Pod Structure

Photothermal CO₂ reduction is one of the most promising routes to efficiently utilize solar energy for fuel production at high rates. However, this reaction is currently limited by underdeveloped catalysts with low photothermal conversion efficiency, insufficient exposure of active sites, low active material loading, and high material cost. Herein, we report a potassium-modified carbon-supported cobalt (K⁺−Co−C) catalyst mimicking the structure of a lotus pod that addresses these challenges. As a result of the designed lotus-pod structure which features an efficient photothermal C substrate with hierarchical pores, an intimate Co/C interface with covalent bonding, and exposed Co catalytic sites with optimized CO binding strength, the K⁺−Co−C catalyst shows a record-high photothermal CO₂ hydrogenation rate of 758 mmol g_cat⁻¹ h⁻¹ (2871 mmol g_Co⁻¹ h⁻¹) with a 99.8 % selectivity for CO, three orders of magnitude higher than typical photochemical CO₂ reduction reactions. We further demonstrate with this catalyst effective CO₂ conversion under natural sunlight one hour before sunset during the winter season, putting forward an important step towards practical solar fuel production.