丰中子锶同位素的投影壳模型研究

利用考虑跨壳激发的投影壳模型（PSM）方法,研究了质子数Z=38、中子数N=63和64大形变丰中子101,102Sr同位素的结构性质。主要计算了转动谱、转动惯量和电磁跃迁性质等（如B（E2）和g因子）,并与相应的实验数据进行系统比较和相关的理论预言。结果表明,PSM可以利用理论计算的能带图解释101,102Sr同位素的转动惯量、电磁跃迁随自旋的变化,分析晕带的结构。PSM理论可以很好地再现实验结果,说明PSM方法及其采用的有效相互作用可以外推研究丰中子核区101,102Sr同位素的原子核结构。对于101,102Sr同位素,核子开始填布质子g_9/2和中子h_11/2轨道,通过更为仔细地分析能带图中来自质子g_9/2和中子h_11/2轨道对各转动带的组态成分的贡献,清晰地表明丰中子核结构性质对不同核子填布的依赖。Recently, we have carried out systematically studies on the structural properties of proton number Z=38, neutron number N=63 and 64 neutron-rich isotopes 101,102Sr by using the projected shell model (PSM) with consideration of cross shell excitation. The rotation spectra, the moment of inertia and the electromagnetic transition properties (such as B(E2) and g-factor) are calculated and compared with the corresponding experimental data in this paper. Furthermore, more high spin states are predicted in the calculation and expected to be confirmed experimentally. The results show that the PSM can not only well analyze the structural properties of yrast bands in 101,102Sr but also interpret the variation of the moment of inertia, electromagnetic transition with spins in terms with the theoretical band diagram. The good agreement with the experimental data suggests that the PSM with the adopted effective interactions can be generalized to study the nuclear structure of 101,102Sr isotopes in neutron-rich mass region. For 101,102Sr isotopes, the nucleons begin to fill proton g_9/2 and neutron h_11/2 orbital, the dependence of nuclear structure and properties on the different orbital occupies is described by carefully analyzing the contribution from proton g_9/2 and neutron h_11/2 orbital to the configuration of rotational bands in band diagram.     

用小角度检定仪检定自准直仪

<正> 在FOCT15806-70(自准直仪的检定方法和检定器具)中建议用经纬仪、测角仪和光楔作为检定自准直仪的标准器具。用经纬仪和测角仪检定自准直仪不能认为是一种可取的方法,因为它们本身的误差与被检自准直仪的误     

二烯烃的定向聚合

一、序言化学家很早就有人工合成橡胶的想法,19世紀中叶查明了天然橡胶的結构单位是异戊二烯,接着从松节油制得了异戊二烯,后用鈉聚合。研究工作继续扩充到其他二烯烃。后来,苏联C.B.列別杰夫終于找到了从酒精制造丁二烯的工业化方法,于1932年开始大規模生产丁鈉橡胶,从此开始了合成橡胶的历史。此后,在第二次世界大战初,德国和美国开始生产丁苯橡胶以及其他以丁二烯为主的共聚物,用共聚方法来改善聚丁二烯的性能。异戊二烯的用途一直很少,只少量用在异丁橡胶中。其原因一則是单体来源不易,二則从它未能制得性能良好的橡胶。随着合成橡胶的发展,发現聚合条件、聚合方法对聚合物性     

Laplace 方程的初值问题

Hadamard 曾证明,Laplaee 方程的初值问题的解对初值是不连续依赖的.在经典的意义下,唯一性是显然的.但可解性的条件似乎还没有人给出过.本文在广义函数的范围内讨论初值问题,给出了可解的充分必要条件,证明了唯一性.当初值是 C~m 函数或L_(loc)~p 函数时,解在广义函数的意义下收敛到初值等价于在 C~m 或 L_(loc)~p 的意义下收敛到初值.因此,我们也给出了经典意义下的初值问题可解的充分必要条件.我们还证明解在广义函数的意义下对初值也不连续依赖.     

Determination of 15 polycyclic aromatic hydrocarbons in lotus root by QuEChERS-high performance liquid chromatographyEI北大核心CSCD

A method for the determination of 15 priority polycyclic aromatic hydrocarbonsPAHsin lotus root by QuEChERS technique combined with high performance liquid chromatography HPLC was established. Lotus root samples were extracted by acetonitrilefiltrated after salting out and purified by C18 and primary secondary aminePSAsorbent. Then the 15 kinds of PAHs were analyzed by HPLC with diode array detector or fluorescence detector after being separated by Athena PAHs column. When the 15 kinds of PAHs were analyzed by diode array detectorthe linear relationships were good between 0.02 and 1.0 mg/L with the correlation coefficients above 0.99 for all the 15 kinds of PAHs. The limits of quantitation were 0.02 mg/kg for allthe average recoveries of the 15 kinds of PAHs were 84.7%-117.1%and the relative standard deviations were 0.73%-11%. When the 14 kinds of PAHsexcept for acenaphthyleneanalyzed by fluorescence detectorthe linear relationships were good between 0.001 and 1.0 mg/L with the correlation coefficients above 0.99 for all the 14 kinds of PAHs except for acenaphthylene. The limits of quantitation were 5 μµg/kg for allthe average recoveries of the 14 kinds of PAHsexcept for acenaphthylenewere 69.1%-111.8%and the relative standard deviations were 0.18%-9.7%. Diode array detector and fluorescence detector are complementary. Diode array detector can analyze all the PAHsbut its sensitivity is relatively low. Fluorescence detector is not suitable for acenaphthylene with weak fluorescence signalbut its sensitivity is much higher than that of diode array detector. This method is suitable for simultaneously and quickly determination of 15 kinds of PAHs in lotus root. © 2022, Youke Publishing Co.,Ltd. All rights reserved.     

湖北十堰蓝色“水波纹”绿松石的谱学特征

“水波纹”绿松石是一种在外观上呈现水波纹状花纹图案的天然绿松石,产量稀少却深受消费者喜爱,前人对绿松石的研究较丰富,但对“水波纹”绿松石的研究较少。对一块基底呈浅蓝白色,条纹呈蓝绿色的“水波纹”绿松石样品用显微激光拉曼光谱仪、显微红外光谱仪、微区X射线衍射、激光剥蚀电感耦合等离子体质谱仪、扫描电镜、显微紫外-可见-近红外光谱仪等测试其各种性能。结果表明,条纹区与非条纹区的主要矿物均为绿松石;红外光谱和拉曼光谱均显示绿松石的光谱;条纹区与非条纹区的化学成分不同,条纹区Al₂O₃,SiO₂,MgO,V,Co,Ni,U及Y,Mo,Cd的含量较非条纹区含量高,而非条纹区P₂O₅,CuO,K₂O及Na₂O的含量较条纹区含量高;扫描电镜微形貌显示,条带区的晶体多为厚板状、晶体颗粒大、排列紧密,几乎不可见孔隙,非条带区的晶体多为大小不一的柱状、碎片状,杂乱排列,可见孔隙;微区X射线衍射表明条带区的结晶度较非条带区的结晶度高;显微紫外-可见-近红外光谱表明条带区与非条带区的致色离子相同,均在426和660 nm处有可见吸收峰,致色离子均为Fe3+和Cu2+。“水波纹”绿松石样品的谱学特征表明,条纹处与非条纹处的颜色差异与致色离子没有明显关系,而颜色及透明度差异与绿松石的结晶程度、致密程度有主要关系,“水波纹”绿松石中绿松石结晶度的变化表明了绿松石形成环境的不稳定性,结晶度的周期性变化表明了形成绿松石的外界环境具有周期性变化的规律,为研究绿松石的颜色成因及绿松石的成矿环境提供数据支撑。     

评福里斯及季莫列娃合著的普通物理学教程

普通物理学的教科书,特别是大学物理系使用的普通物理学教科书,应该满足一系列必需的要求。列宁曾经指示过在所有的讲授课程中和在所有与这课程相应的教科书中,什么样的条件是最重要的。列宁写道:“在所有的学校中,最重要的是讲义中的政治思想方向。”由此可知,有关普通物理学课程的教科书首先就是应该有思想方向的。这意味着:在书中不仅     

现场拉曼光谱研究聚吡咯的去质子和氧化降解

利用电化学现场拉曼光谱结合循环伏安法，研究了中性和碱性溶液中聚吡咯（ＰＰＹ）膜的行为及其结构，结果表明，氧化ＰＰＹ中吡咯环Ｎ原子上的Ｈ失去发生去质子化，形成一种醌式结构，由于该酯式结构的出现使ＰＰＹ的Ｃ＝Ｃ伸缩振动峰发生分裂，且因该酯式结构不能被进一步氧化，以致ＰＨ值增大，去质子化程度提高，ＰＰＹ变得较难被氧化，而使其可逆性也受到一定程度的破坏，在ＰＨ－１３的强碱性溶液中，ＰＰＹ膜在正于０Ｖ的电位     

射频功率对富硅-氮化硅薄膜结构及性质影响

采用等离子体增强化学气相沉积法,以SiH4、NH3和N2为反应气源,通过改变射频功率制备富硅-氮化硅薄膜材料.利用傅里叶变换红外吸收光谱,紫外-可见光透射光谱,扫描电镜等对薄膜材料结构与性质进行表征.实验表明,随着射频功率的逐渐增加,薄膜光学带隙缓慢减小、有序度增加,薄膜材料中的Si-H键、N-H键缓慢减小,Si-N键增多.分析结果发现,适量的增加射频功率有利于提高样品反应速率,使薄膜有序度增加,致密性增强,提高薄膜质量,但过高的射频功率会使薄膜质量变差.     

Na-Mg共掺杂ZnO薄膜的结构和光学性质

利用溶胶-凝胶法,在普通载玻片上使用旋转涂膜技术制备了具有c轴择优取向生长的Na-Mg共掺杂的ZnO薄膜。用XRD、SEM、光致发光(PL)及透射光谱对薄膜样品进行了表征。结果表明:Na-Mg共掺杂有利于ZnO薄膜的c轴择优取向生长,并且随着Na+掺杂浓度的增加,晶粒尺寸先增大后减小;通过比较不同掺杂浓度ZnO薄膜的PL谱,推测发光峰值位于380nm的紫外发射与ZnO的自由激子复合有关;发现掺入Mg的确能使ZnO禁带宽度增大,掺杂组分为Na0.04Mg0.2Zn0.76O时,其PL谱只有一个很强的紫光发射峰,其近带边紫外光发射强度较未掺杂的ZnO增强了近10倍,极大地提高了薄膜紫外发光性能;并且随Na+浓度增加薄膜透光性减弱。