原子核过渡区的量子相变

在相互作用玻色子模型(IBM) 基础上用O(6) 高阶项代替传统的SU(3) 四极-四极相互作用来研究原子核从振动到转动过渡区的量子相变行为。利用U(5)-SU(3) 和UQ 两种方案,在玻色子数分别为N = 8 和N = 20 不同情况下,研究了原子核的一些低激发态的能级比和电四极跃迁比。结果表明:随着玻色子数N 的增大,系统的量子相变行为得到加强;两种方案都可以用来描述从振动到转动过渡区的原子核的量子相变特征且O(6) 高阶项方案下量子相变行为更为明显。在此基础上,进一步应用这两种方案具体讨论了152Sm 核的低激发态能级和电四极跃迁性质并与实验数据进行对比分析。结果表明,用O(6) 高阶项可以更为合理地描述带内跃迁及不同带之间的带间跃迁性质。With the framework of Interacting Boson Model(IBM), transitional patterns from the spherical to the axially deformed limit of the IBM with a schematic Hamiltonian are studied by replacing the SU(3) quadrupole-quadrupole term with O(6) cubic interaction. But, we use the two schemes to investigate some energy ratios and B(E2) ratios for different bosons N = 8 and N = 20. The results show that with the increasing of the numbers of bosons, the transitional behaviors can be enhanced; the transitional behaviors are very similar in the two schemes. However, there are some distinctive differences for some quantities across the entire transitional region, such as energy levels and ratios, B(E2) values and ratios, and expectation values of the shape variables. Generally speaking, the transition is smoother and the nuclear shape is less well defined in the new scheme. Then we apply the two schemes to the critical point symmetry candidate, such as 152Sm, and find the overall fitting quality of the UQ scheme is better than that of the U(5)-SU(3) scheme, especially for the inter-band E2 transitions in 152Sm.     

Contamination process and laser-induced damage of HfO2/SiO2 coatings in vacuum

The performances of HfO2/SiO2 single- and multi-layer coatings in vacuum influenced by contamination are studied. The surface morphology, the transmittance spectrum, and the laser-induced damage threshold are investigated. The results show that the contamination in vacuum mainly comes from the vacuum system and the contamination process is different for the HfO2 and SiO2 films. The laser-induced damage experiments at 1064 nm in vacuum show that the damage resistance of the coatings will decrease largely due to the organic contamination.     

描述大形变核中对力的硬核Bose-Hubbard模型

讨论了一种描述大形变偶偶核邻近轨道对力相互作用近似的硬核Bose-Hubbard模型.利用代数方法得到了该模型对激发谱和相应波函数的严格解.该结果可推广到具有任意自旋和有限格点的硬核Bose-Hubbard和Fermi-Hub-bard模型中去.     

Electrical control of magnetism in oxides

Recent progress in the electrical control of magnetism in oxides,with profound physics and enormous potential applications,is reviewed and illustrated.In the first part,we provide a comprehensive summary of the electrical control of magnetism in the classic multiferroic heterostructures and clarify the various mechanisms lying behind them.The second part focuses on the novel technique of electric double layer gating for driving a significant electronic phase transition in magnetic oxides by a small voltage.In the third part,electric field applied on ordinary dielectric oxide is used to control the magnetic phenomenon originating from charge transfer and orbital reconstruction at the interface between dissimilar correlated oxides.At the end,we analyze the challenges in electrical control of magnetism in oxides,both the mechanisms and practical applications,which will inspire more in-depth research and advance the development in this field.     

惰性盐辅助合成介孔石墨化碳片及其电容性能

以惰性盐KCl为模板、硝酸镍为金属催化剂镍源、葡萄糖为碳源,通过碳化处理制备了介孔石墨化碳片。利用扫描电子显微镜、透射电子显微镜、X-射线衍射仪和比表面测试仪对介孔石墨化碳片进行了表征。探讨了碳片形成的机理,采用三电极测试体系研究了介孔石墨化碳片电极材料的电化学性能。结果表明,10gKCl制备的碳片比表面积最大（989m²·g^-1）,在6mol·L^-1KOH电解液中,当电流密度为0.5A·g^-1时,比电容达到180F·g^-1;当电流密度达到10A·g^-1时,比电容维持在148F·g^-1,显示了电极具有较好的倍率性能;在10A·g^-1条件下,2000次循环充放电测试后电容没有发生衰减,展示了在超级电容器方面的应用潜力。     

相互作用玻色子模型中振转过渡区的特征研究

详细研究了相互作用玻色子模型中U(5)振动极限到SU(3)转动极限的相变行为.通过对能谱和E2跃迁强度等的分析,说明了在临界点的核具有最大的非刚性. Transitional patterns from the U(5) vibrational limit to the SU(3) rotational limit in the interacting Boson model are studied in detail. The transitional behavior of low-lying energy levels, isomer shifts, E2 transition rates, and some other related quantities across the entire region are investigated. The results show that nuclei in the critical region are most non-rigid.     

SU_3U_1U_1的矢量相干态表示

本文讨论了SU_3的矢量相干态表示。利用K矩阵技术得到了SU_3?U_1?U_1的正交基矢,从而确定了权的多重度。     

正交基下的一些无多重性SUN SON同位标量因子的解析表达式

本文导出了一些SU_N SO_N SO_N－1按 SU_N SU_N－1 SO_N－1态展开系数.利用该系数及已知的SO_N SO_N－1同位标量因子,我们求得了SU_N SO_N关于耦合[w₁w₂0…0]×[w₃0…0]→[w₁w₂0…0]的无多重性同位标量因子的解析表达式.     

兔膝关节软骨及软骨下骨的吡啶诺林的高效液相色谱测定

兔膝关节炎模型的关节软骨及软骨下骨 ,经盐酸水解 ,纤维素CF11分离吡啶诺林 (Pyr) ,高效液相色谱测定其含量 ;采用 μBondapakC18 柱 (10μm,3.9mm×300mm) ,以V 乙腈∶V 水[0.5 %(φ)七氟正丁酸]=25∶75为流动相,荧光检测器在λem 和λex 分别为390nm和297nm的条件下测定Pyr;在0.250～6.00μmol/L的范围内 ,Pyr含量与峰面积有良好的线性关系 ,r=0.9996 ,加标平均回收率是98 % ,相对标准差(n=6)是3.3 % ;样品测定结果显示 ,8周内 ,关节软骨中Pyr含量逐渐下降 ,软骨下骨中Pyr含量在早期下降 ,随后逐渐升高 ;骨胶原Pyr含量的变化是造成尿液Pyr升高的原因。     

meso—四（3,5—二溴—4—羟基苯）卟啉修饰电极测定Pb（Ⅱ）的 …

将ｍｅｓｏ－四（３，５－二溴－４－羟基苯）卟啉与阴离子表面活性剂十二烷基苯磺酸钠一同吸附在汞膜玻炭电极上，制得卟啉修饰电极。该电极对Ｐｂ＾２＋的测定在响应区间有良好的线性关系，电极具有灵敏度高、稳定性好、易清洗、使用寿命长等特点。对Ｐｂ＾２＋的检出限可达１×１０＾－１０ｍｏｌ·Ｌ＾－１数量级，可不用富集直接测定自来水中Ｐｂ＾２＋。