Bc介子非轻子两体衰变

计算Bc介子非轻子两体衰变Bc→X+Y,末态强子之一X是P波Xc态或hc态过程的衰变宽度.强子跃迁矩阵元写成形状因子的形式,形状因子表示初态末态介子波函数的重叠积分,介子波函数采用势模型理论求得.     

磁场对方形量子阱线中类氢杂质束缚能的影响

采用无限深势阱模型,变分法计算了磁场对截面为方形的一维量子阱线中类氢杂质基态束缚能的影响,同时还讨论了施主离子位置的变化对束缚能的影响。计算结果表明外加磁场使得体吵缚能增加,杂质离子位于阱中心时,束缚能最大,位于正方形的某个角点时,束缚能最小。     

水热条件下影响晶体生长的因素

着重对水热法生长晶体过程中的影响因素进行了分析.高压釜内温度分布、溶液(或溶剂)填充度、浓度和pH值、杂质等会对生成晶体的形状、结构、颜色、生长速度、晶体缺陷和晶体质量产生影响.     

有限深抛物量子阱中的类氢杂质态

运用三参数变分法,研究了在垂直于生长方向的磁场作用下抛物量子阱中类氢杂质态的束缚能和1s→2p-态跃迁能.结果表明,束缚能和跃迁能随阱宽变化有一极大值;束缚能随磁场单调增加,而跃迁能随磁场的变化出现了极小值.     

矢量双轻子与大型强子对撞机上的Higgs数据

考虑到反常磁矩aμ对RM331模型自由参数的限制,本文计算了矢量双轻子V±,U±±对Higgs衰变过程h→γγ和h→Zγ的贡献.数值结果显示:在合理的参数范围内,矢量双轻子可解释LHCγγ产生道的相关数据.     

鄂霍次克海东南部180ka BP以来底栖有孔虫δ~(13)C轻值事件

对鄂霍次克海东南部OS03-1岩芯180 ka BP以来底栖有孔虫内生种Uvigerina spp.进行了稳定氧碳同位素分析,发现了112~109 ka BP(Ⅵ),102~90 ka BP(Ⅴ),85~76 ka BP(Ⅳ),57~54 ka BP(Ⅲ),44~40 ka BP(Ⅱ)和17~10 ka BP(Ⅰ)的6次δ13C轻值事件,其中发生于102~90 ka BP的轻值事件Ⅴ中的δ13C降幅最大,达到了2.5‰,其他事件中均达到1‰以上.研究认为,这些δ13C轻值事件可能由表层生产力增高、鄂霍次克海中层水形成减弱、最低含氧带加强等因素共同引起.古菌生物标志物结果表明,这些δ13C轻值事件没有受到天然气水合物分解和甲烷气体释放的影响.     

Preparation of Zn-doped TiO2 nanotubes electrode and its application in pentachlorophenol photoelectrocatalytic degradation

Zn-doped titanium oxide （TiO2） nanotubes electrode was prepared on a titanium plate by direct anodic oxidation and immersing method in sequence. Field emission scanning electron microscopy （FESEM） showed that the Zn-doped TiO2 nanotubes were well aligned and organized into high density uniform arrays with diameter ranging from 50 to 90 nm. The length and the thickness were about 200 and 15 nm respectively. TiO2 anatase phase was identified by X-ray diffraction （XRD）. X-ray photoelectronspectroscopy （XPS） indicated that Zn ions were mainly located on the surface of TiO2 nanotubes in form of ZnO clusters. Compared with TiO2 nanotubes electrode, about 20 nm red shift in the spectrum of UV-vis absorption was observed. The degradation of pentachlorophenol （PCP） in aqueous solution under the same condition （initial concentration of PCP： 20 mg/L; concentration of Na2SO4：0.01 mol/L and pH： 7.03） was carried out using Zn-doped TiO2 nanotubes electrode and TiO2 nanotubes electrode. The degradation rates of PCP using Zn-doped TiO2 nanotubes electrode were found to be twice and 5.8 times as high as that using TiO2 nanotubes electrode by UV radiation （400 μw/cm^2） and visible light radiation （4500 μw/cm^2）, respectively. 73.5% of PCP was removed using Zn-doped TiO2 nanotubes electrode against 45.5% removed using TiO2 nanotubes electrode in 120 min under UV radiation. While under visible light radiation, the degradation efficiency of PCP was 18.4% using Zn-doped TiO2 nanotubes electrode against 3.2% using TiO2 nanotubes electrode in 120 min. The optimum concentration of Zn doping was found to be 0.909%. The PCP degradation efficiencies of the 10 repeated experiments by Zn-doped TiO2 nanotubes electrode were rather stable with the deviation within 3.0%.     

轻骨料混凝土综述

本文介绍了轻骨料混凝土的概念,以及根据砂的种类、骨料的堆积密度和颗粒强度、骨料的来源等的分类,论述了轻骨料混凝土所具有的轻质高强、保温性好、耐火性能好、抗震性能好、耐久性好、综合经济效益好等特点,阐述了轻骨料混凝土的研究和应用情况。     

Characterization of impurities in the bulk drug lisinopril by liquid chromatography/ion trap spectrometry

Two trace impurities in the bulk drug lisinopril were detected by means of high-performance liquid chromatography coupled with mass spectrometry （HPLC/MS） with a simple and sensitive method suitable for HPLC/MSn analysis. The fragmentation behavior of lisinopfil and the impurities was investigated, and two unknown impurities were elucidated as 2-（6-amino- l-（l-carboxyethylamino）- l-oxohexan-2-ylamino）-4-phenylbutanoic acid and 6-amino-2-（l-carboxy-3-phenylpropylamino）-hexanoic acid on the basis of the multi-stage mass spectrometry and exact mass evidence, The proposed structures of the two unknown impurities were further confirmed by nuclear magnetic resonance （NMR） experiments after preparative isolation.     

型钢轻骨料混凝土梁抗弯承载力计算

基于简单叠加法,考虑型钢对混凝土的约束,提出型钢轻骨料混凝土梁抗弯承载力的改进叠加法计算公式.改进叠加法在混凝土承载力项中引入了混凝土抗弯承载力修正系数αrc.对8个型钢轻骨料混凝土梁和8个型钢普通混凝土梁的抗弯承载力修正系数进行分析,分析结果表明:当总含钢率与纵筋配筋率的比值在3.4%～10.8%时,αrc和该比值成正比,αrc的范围为1.0～2.0,改进的公式和钢筋混凝土梁抗弯承载力计算公式相衔接.试验结果对比表明:改进叠加法具有足够的精度,同时适用于型钢轻骨料混凝土梁和型钢普通混凝土梁.