Correlation between Luminescence and EPR Spectroscopy as Evidence of Ytterbium Pair Formation in Li6Ln(BO3)3:Yb3+ (Ln=Gd,Y) Borate Single Crystals

Synthesized powders and grown single crystals of nominal compositions Li₆Ln(BO₃)₃:Yb³⁺ (Ln=Y, Gd) were investigated by means of powder and single‐crystal X‐ray diffraction (XRD), as well as optical near‐IR spectroscopy in conjunction with electron paramagnetic resonance (EPR) spectroscopy. The appearance of two distinct zero‐phonon lines suggests the existence of two kinds of Yb³⁺ ions in the single crystals. The XRD results exclude the possibility of a phase transition occurring between room and low temperatures. EPR spectra of single crystals show the presence of both isolated ions and pairs of ytterbium ions substituted for Y³⁺. A strong temperature dependence of the intensity of Yb–Yb pairs resonance lines coincides with temperature dependence of emission peak at 978 nm, confirming a common origin of the defect giving rise to these spectra. Calculated from EPR spectra, the distance between pairs of Yb³⁺ is in good agreement with crystallographic ones: R=3.856 Å, R_cryst=3.849 Å.     

增溶性辅料泊洛沙姆188与胆酸聚集形态的介观模拟

为了建立符合中药特点的增溶性药用辅料的筛选与评价方法,本研究以清开灵注射液为研究载体,采用介观动力学方法(MesoDyn)研究其难溶活性成分胆酸与增溶性辅料泊洛沙姆188之间的相互作用,探讨了胆酸对泊洛沙姆188临界胶束浓度的影响及泊洛沙姆188浓度、模拟时间、温度对两者聚集体构型的影响,并采用实验方法验证了部分模拟结果,为中药注射剂增溶性辅料的科学应用提供一定基础.结果表明:在清开灵注射液中活性成分胆酸的存在下,泊洛沙姆188的临界胶束浓度范围为0.6%～0.7%,降低了泊洛沙姆188自身的临界胶束浓度,为使清开灵注射液中的胆酸(3%)全部增溶,泊洛沙姆188浓度应为1.7%.     

关于一类择优增长系统的度分布的注记

本文研究文[1]中提出的一类择优增长系统,说明文[1]中利用主方程法求解系统的平均度分布及稳态度分布是值得商榷的,然后通过考虑系统中空团体的存在的可能性,对系统进行修正,并证明空团体存在的必要性。     

临界或超临界增长分数阶Schrodinger-Poisson方程正解的存在性

本文研究如下分数阶Schrodinger-Poisson方程{(-△)^su+Vx(u)+K(x)φu=f(u)+λ|u|^q-2ux∈R³,(-△)^tφ=K(x)u²,x∈R³其中S∈(3/4,1),t∈(0,1),f是在原点超线性无穷远次临界的连续非线性项,指数q≥2_s^*=6/3-2x.当λ>0充分小时,我们利用变分方法证明上述问题正解的存在性.本文的主要贡献是处理了超临界情形.     

基于ISM与M-F模型的公务员工资普调频率研究

以普调频率为核心的工资增长机制,是我国公务员工资制度改革悬而未决的难点问题,其关键在于分析影响因素并确定普调周期。文章采用ISM、M-F等方法,对我国公务员工资普调频率影响因素进行量化分析,旨在通过研究各因素影响时效的衍变规律,寻求长期稳态下最适宜的普调周期。研究发现,基于时效周期的工资普调影响指标体系包含24项因素,其中CPI等8项流量因素构成短期时效层,自身变化及影响时效短,易波动,综合影响期为1.55年;平均任职时间等13项存量因素构成中期时效层,指标变动具有长期累积性,综合影响期为3.11年;工资差异结构等3项支配因素构成长期时效层,反映工资供求矛盾状态,综合影响期为4.53年;在24项因素综合作用下,系统于2.34年达到了长期稳态水平,各项影响因素实现了最佳平衡,可近似将2.50年设计为普调周期。     

Regularity for obstacle problems without structure conditions

This paper deals with the Lipschitz regularity of minimizers for a class of variational obstacle problems with possible occurrence of the Lavrentiev phenomenon. In order to overcome this problem, the availment of the notions of relaxed functional and Lavrentiev gap is needed. The main tool used here is a crucial Lemma which reveals to be needed because it allows us to move from the variational obstacle problem to the relaxed-functional-related one. This is fundamental in order to find the solutions’ regularity that we intended to study. We assume the same Sobolev regularity both for the gradient of the obstacle and for the coefficients.