光化学反应中氩气对激发态锂原子猝灭速率研究

本文对光化学法分离中氩气对2P激发态锂原子的碰撞猝灭速率进行研究.在弱激光作用下,通过对不同氩气压强下的锂原子蒸气吸收光谱和激发态锂原子的荧光发射光谱进行测量,得到氩气对2P激发态锂原子的猝灭速率常数为(12.29±0.92)×10-18m3·s-1.实验结果表明:在光化学锂同位素分离研究中,氩气对锂原子2P激发态的猝灭速率远小于2P激发态锂原子的自发辐射速率,碰撞猝灭效应对分离选择性的影响非常小,可以忽略不计.     

几种吸附材料去除主流烟气中的挥发性醛酮类化合物

研究了分别添加活性炭、竹炭、海泡石、壳聚糖的卷烟复合滤咀对主流烟气中挥发性醛酮类化合物和其他有害物质(如焦油、一氧化碳等)的吸附效果.研究结果表明:壳聚糖滤嘴的吸附性能大干活性炭,竹炭和海泡石;活性炭的吸附性能优于竹炭和海泡石.对于焦油,海泡石的吸附作用最大,竹炭、活性炭有一定的吸附,壳聚糖则无明显影响.壳聚糖对于烟气...     

气相色谱法测定卷烟主流烟气气相物中的二氧化碳气体

采用热导检测器-气相色谱,外标法定量,测定了卷烟主流烟气气相物中的二氧化碳气体,实验结果表明：方法的准确度和精密度均很好,且测定数据可靠,结果令人满意。     

Seyfert1星系黑洞质量与辐射压的研究

从斯隆数字巡天（SDSS）收集了214个Seyfert1星系,其中147个窄线的Seyfert1星系（NLSls）,67个宽线的Seyfert1星系（BLSls）,对其黑洞质量、核球速度弥散、爱丁顿比、5100A光度、红移进行了研究,得到以下结论：1）在进行黑洞质量估算时,应考虑辐射压的影响,特别是窄线Seyfert1星系;2）在考虑辐射压的情况下,窄线Seyfert1星系满足近距正常星系的MBH一盯关系,其吸积未超爱丁顿极限吸积;3）在大样本下Seyfert1星系从窄线Seyfert1星系到宽线Seyfert1星系演化,与他人用其他方法获得的结果是一致的．     

高效液相色谱测定卷烟及其主流烟气中的维生素E

样品用饱和抗坏血酸乙醇溶液萃取,ZORBAX Extend-C18（5μm,4.6×150mm）色谱柱及FLD检测器在激发波长为298nm,发射波长为325nm下检测,流动相为100%甲醇。采用外标法定量,线性相关系数为0.99996,检出限为0.12μg/mL,卷烟及其主流烟气中维生素E平均回收率分别为97.0%和97.4%,RSD分别为0.70%和4.70%。研究表明：烤烟型卷烟烟丝比混合型卷烟烟丝中维生素E含量高,烤烟型卷烟主流烟气比混合型卷烟主流烟气中维生素E含量高,维生素E从卷烟烟丝到主流烟气的迁移率为7%—16%。     

纳米孔材料降低卷烟烟气中多环芳烃和亚硝胺的研究进展

介绍了纳米孔材料的特性,并简要综述了纳米孔材料对PAHs和TSNA的吸附和催化降解机理以及纳米孔材料在降低卷烟烟气中PAHs和TSNA的应用研究进展。     

Tuning Redox Active Polyoxometalates for Efficient Electron-Coupled Proton-Buffer-Mediated Water Splitting

We present strategies to tune the redox properties of polyoxometalate clusters to enhance the electron-coupled proton-buffer-mediated water splitting process, in which the evolution of hydrogen and oxygen can occur in different forms and is separated in time and space. By substituting the heteroatom template in the Keggin-type polyoxometalate cluster, H₆ZnW₁₂O₄₀, it is possible to double the number of electrons and protonation in the redox reactions (from two to four). This increase can be achieved with better matching of the energy levels as indicated by the redox potentials, compared to the ones of well-studied H₃PW₁₂O₄₀ and H₄SiW₁₂O₄₀. This means that H₆ZnW₁₂O₄₀ can act as a high-performance redox mediator in an electrolytic cell for the on-demand generation of hydrogen with a high decoupling efficiency of 95.5 % and an electrochemical energy efficiency of 83.3 %. Furthermore, the H₆ZnW₁₂O₄₀ cluster also exhibits an excellent cycling behaviour and redox reversibility with almost 100 % H₂-mediated capacity retention during 200 cycles and a high coulombic efficiency >92 % each cycle at 30 mA cm⁻².     

Synthesis and Crystal Structure of the Optical Activity of （Z）-Nitromethylene Neonicotinoid Analogue

A novel (Z)-nitromethylene neonicotinoid analogue (C23H27Cl2N5O4·2H2O) (II) with optical activity has been synthesized, the structure was characterized by elemental analysis, IR and 1H NMR spectra, and the (Z)-configuration was confirmed by single-crystal X-ray diffraction. The crystal belongs to triclinic, space group P1 with a = 7.4638(3), b = 12.6232(5), c = 15.2990(6), α = 71.907(1), β = 89.397(2), γ = 80.314(1)°, V = 1349.28(9)3, Z = 2, Dc = 1.340 g/cm3, μ = 0.286 mm-1, Mr = 544.43, F(000) = 572, S = 1.056, R = 0.0801 and wR = 0.2366 for 4998 unique reflections with 3012 observed ones (I > 2σ(I)). In the crystal, the dihedral angle between the pyridine and 4-Cl-phenyl rings is 58.13°. Intermolecular O–H···O, C–H···O and C–H···Cl hydrogen bonds involving water molecules stabilize the crystal structure.     

基于近红外光谱的烟叶纵向分切方法

为了研究初烤烟叶纵向分切方法,分别对玉溪K326和昆明红大两个品种3个典型等级初烤烟叶进行纵向等面积分切,并测定不同分切部位的近红外漫反射光谱,利用主成分分析法以及系统聚类法研究初烤烟叶各分切部位的差异性。结果表明:(1)主成分分析对初烤烟叶不同纵切部位的样本有一定的聚类作用,但是需要肉眼判断,带有一定的主观性;(2)系统聚类分析结果表明,昆明红大3个等级样品均是近叶基端(12A部分)为第一类,其余部分为第二类;玉溪K326不同等级分类方法有所不同,但均是近叶基端为一类。(3)本研究认为,不论对于玉溪K326还是昆明红大初烤烟叶品种,均可以切除约占烟叶面积9%—25%(约占烟叶长度15%—30%)的近叶基端部分进行单独切断打叶复烤。研究结果为两段式打叶复烤新技术提供了新的分切方法与理论支持。     

Synthesis,Crystal Structure and Bioactivity of N-Phenethyl-4-hydroxy-4-phenyl Piperidine Hydrochloride

A novel compound N-phenethyl-4-hydroxy-4-phenyl piperidine hydrochloride （C19H24ClNO·H2O） has been synthesized and structurally characterized by elemental analysis, IR, ^1H NMR spectra and single-crystal X-ray diffraction. The crystal belongs to orthorhombic, space group P212121 with a = 8.6306（8）, b = 11.0464（10）, c = 19.3221（18）A^°, V = 1842.1（3）A^°^3, Z = 4, Dc =1.211 g/cm^3,μ = 0.217 mm^-1, Mr= 335.86, F（000） = 720, S = 0.973, R = 0.0420 and wR = 0.1009 for 3627 unique reflections with 3157 observed ones （I 〉 2σ（I））. In the crystal, the dihedral angles made by piperidine ring with two benzene rings are 84.8（6） and 62.5（7）°, respectively. Intermolecular O-H…O and O-H…Cl hydrogen bonds involving water molecules form chains along the b axis, which stabilizes the crystal structure. The preliminary bioactivity tests indicated that the title compound has good effect of cellular growth inhibition to K562 cells and potential bioactivity of anti-leukemia.