Organocatalytic asymmetric [3 + 3] annulation of isatin N,N'-cyclic azomethine imines with enals: Efficient approach to functionalized spiro N-heterocyclic oxindoles

An unprecedented chiral secondary amine-catalyzed [3 + 3] annulation of isatin N,N'-cyclic azomethine imines with α,β-unsaturated aldehydes was developed. This strategy allowed the construction of structurally novel spiro N-heterocyclic oxindole derivatives in good yields (up to 91%) and good to excellent enantioselectivities (up to >99% ee), albeit with modest diastereoselectivities (up to 3.1:1 dr).     

库仑滴定法测定钒电池电解液中钒(Ⅲ)与钒(Ⅳ)的含量

钒电池是利用不同价态的钒离子在硫酸电解质溶液中发生氧化还原反应,实现化学能与电能之间的相互转换,从而具有大容量的快速充放电且功率和容量可调节等优点,被相关行业认为是最佳新能源储存介质[1-2]。该电池的容量和充放电效率,与电解液中不同价态的钒离子浓度有关,而该电解液中的钒离子的起始状态通常为钒(Ⅲ,V3+)和钒(Ⅵ,VO2+)混合态,当两种离子浓度的比值为1时,电池比容量达到最大[3-4],因此如何简便、快速且高效的测定V3+和VO2+的含量,对产品的质量控制意义重大。     

Baeyer–Villiger oxidation of cyclohexanone by molecular oxygen with Fe–Sn–O mixed oxides as catalysts

Fe–Sn–O mixed oxides were synthesized and used as catalysts for Baeyer–Villiger oxidation of cyclohexanone, which showed both high catalytic activity and selectivity. X‐ray powder diffraction and scanning electron microscopy suggested that the Fe–Sn–O catalysts had a tetragonal structure with a grain size of 29.3 nm. An ε‐caprolactone yield as high as 98.8% was obtained in a small‐scale experiment (5 mmol of cyclohexanone). In a scale‐up test (20 mmol of cyclohexanone), the cyclohexanone conversion and ε‐caprolactone yield were 96.7 and 96.5%, respectively. In addition, the catalysts can be reused five times without any major decline in catalytic activity. Copyright © 2015 John Wiley & Sons, Ltd.     

He—Ne激光血管内照射与尿激酶治疗脑梗塞对比研究及微观机理初探

将６２例脑梗塞患者随机分为两组,并分别用激光血管内照射（ＩＬＩＢ）及尿激酶进行治疗,继而对两组疗效进行对比性观察、测试及评估。文末对ＩＬＩＢ的作用机理进行了分析。     

印制电路板镀通孔制程可靠性问题与研究技术途径

影响镀通孔制程可靠性因素众多,关系复杂,需要一个有效的技术途径来研究该问题。文中总结了印制电路板镀通孔制程的各个加工步骤和工序的目的,以及制造过程中影响这些目的达成效果的影响因素。分析汇总了印制电路板镀通孔的各种失效模式和机理,及其对应的失效发生的部位和影响因素。在此基础上,明确了进行印制电路板镀通孔制程可靠性研究的技术途径,同时给出了实施这项研究的技术细节。     

基于多因素信任的分布式信任模型

提出了一种基于多因素信任的分布式信任模型,通过引用时效函数来区分不同时间内的信任在直接信任度中的重要性。在计算节点的综合信任值时,通过对节点剩余能量的分析,加入了能量信任值,并通过将通信信任和能量信任结合在一起,适当地调节通信信任和能量信任的权重大小来评价传感器节点的可信度。仿真实验与分析证明,该模型较其他模型,能更快的识别出恶意节点,在节点交互成功率和网络的安全性方面均有大幅提高。     

Polyion micelles with diphase-segregated core: electrostatic self-assembly of poly(ethylene glycol)-<Emphasis Type="Italic">block</Emphasis>-poly(4-vinylpyridium) and tetrakis (4-sulfonatophenyl) porphyrin in solution

The polyion micelles were prepared with poly(ethylene glycol)-block-poly(4-vinylpyridium) (PEG₁₁₄-b-P(4-VPH+)₃₅) and tetrakis (4-sulfonatophenyl) porphyrin (TPPS) in acid aqueous solution. Micellization was investigated by using a combination of static and dynamic laser scattering. UV–Vis spectroscopy revealed that the H- and J-type aggregates of TPPS were formed in the micellar core. Transmission electron microscopy studies of the polyion micelles show that the obtained polyion micelles take a diphase-segregated core, the polymer phase and the incompatible TPPS aggregates phase.     

激光血管内照射改善血液流变学性质的一机理分析及疗效测试

本文用量子力学,对激光血管内照射（ＩＬＩＢ）能改善血液流变学性质的机理制进行了分析,即认为激光确易使纤维蛋白凝块解体,而改善血流流变学性质。此与临床测试结果一致。     

Second-order relative exponent of isotropic turbulence

Theoretical results on the scaling properties of turbulent velocity fields are reported in this letter. Based on the Kolmogorov equation and typical models of the second-order statistical moments (energy spectrum and the second-order structure function), we have studied the relative scaling using the ESS method. It is found that the relative EES scaling exponent S₂ is greater than the real or theoretical inertial range scaling exponent ξ₂, which is attributed to an evident bump in the ESS range.     

低能量氦氖激光血管内照射治疗椎-基底动脉供血不足患者的TCD及BAEP变化

目的：了解低能量氦氖激光血管内照射（ILIB）对椎－基底动脉供血不足（VBI）患者的经颅超声多普勒（TCD）及脑干听觉诱发电位（BAEP）检查的影响。方法：将295例VBI患者分为治疗组（常规治疗＋ILIB治疗）及对照组（常规治疗），治疗前、后分别进行TCD及BAEP检测。结果：治疗组及对照组治疗后较治疗前TCD及BAEP各项参数均有显著改善，治疗组较对照组更着显。结论：ILIB克有改善血液流变学性质及脑血液循环的作用，从而也改善脑的电生理功能。