基于邻苯二酚的可降解黏合剂的制备及表征

以氨基化聚乙二醇(mPEG-NH2)为大分子引发剂,制备了基于邻苯二酚[如3,4-二羟基苯丙酸(DHPPA)和3,4-二羟基苯丙胺即多巴胺(Dopamine)]的仿生黏合剂聚乙二醇单甲醚-聚赖氨酸-g-3,4-二羟基苯丙酸[mPEG-b-P(LL-g-DHPPA)]和聚乙二醇单甲醚-聚谷氨酸-g-3,4-二羟基苯丙胺[mPEG-b-P(LG-gDopamine)].用核磁共振波谱(NMR)、傅里叶变换红外光谱(FTIR)和凝胶渗透色谱(GPC)等方法表征了mPEG-b-P(LL-g-DHPPA)和mPEG-b-P(LG-g-Dopamine)的结构.mPEG-b-P(LL-g-DHPPA)和mPEG-b-P(LG-gDopamine)的接枝度分别为30%和28.6%,即每个聚合物分子链上分别接上了13.5个DHPPA单体和13个Dopamine单体.剪切强度测试结果表明,mPEG-b-P(LL-g-DHPPA)更有利于黏合剂的固化并能提高黏合剂的内聚强度.     

谐振式光子带隙光纤陀螺一体化方案（英文）

实现了使用光子带隙光纤的一体化谐振式光纤陀螺方案,设计并制作了谐振腔中基于微光学结构的耦合器。实验测得制作的谐振腔清晰度为3.7。搭建了基于该谐振腔的陀螺系统,并对其主、次偏振态的谐振曲线进行了实际测量。实验结果测得该系统60s零漂为2.45(°)/s,及1h长期稳定性为7.11(°)/s。同时,实现了对应陀螺输出±50(°)/s(积分时间10s)及±100(°)/s(积分时间10s)的模拟转速实验,验证了该陀螺系统的Sagnac效应。分析得到耦合损耗是影响该陀螺系统性能的主要因素。验证了该谐振腔结构具有应用于陀螺系统的可行性,为谐振式光纤陀螺性能进一步提高提供了参考。     

$\beta$阶星象函数和凸象函数的几个充分条件的扩展

本文目的是研究了两个新算子$\mathcal{E}_{\alpha, \lambda}^{\gamma}$和$H_{m}^{l}(\alpha_1)$的星形和凸性的几个充分条件, 分别与定义在单位圆盘的广义Mittag-Leffler函数$E_{\alpha, \lambda}^{\gamma}$和广义超几何函数有关.本文得出的结果与早期的一些已知结果建立联系.     

On the uniform strong approximation of Marcinkiewicz type for multivariable continuous functions

The rate of uniform strong approximation of Marcinkiewicz type for multivariable continuous func-tions is obtained in this paper as follows:‖1/k 1 k∑j=0|Sj(f)- f|q‖≤C/k 1 k∑j=0 Eqj(f),where Sj (f) denotes the square partial Fourier sum of f and Ej (f) denotes the square best approximation of f by trigonometric polynomials of degree (j, j, … ,j),j = 0,1, 2,….     

1,2-二芳基乙烯分子无损读取研究

1,2-二芳基乙烯类光致变色分子具有优良的热稳定性和耐疲劳性.它们作为新一代的光存储材料以及分子器件中光电微观性质控制的分子开关,引起了人们的重视.本文介绍了1,2-二芳基乙烯类光致变色分子的合成方法和光致变色性质,重点综述了这类分子在无损读取光存储材料方面的研究进展.     

Darcy-Stokes方程的一种局部稳定化有限元方法

1 引 言 {σu-v△u+▽p=f在Ω ▽·u=0在Ω (u)=0在(e)Ω 其中u=(u1,u2)为二维向量,Ω(c)R2是多边形区域,σ,v是粘性系数(σ,V不能同时为零),f表示外力.     

Using a precursor in lamellar structure for the synthesis of uniform ZnS nanocrystals

Uniform ZnS nanocrystals of about 15?nm were prepared through a low temperature hydrothermal approach by treating Zn-PhPO nanosheets with Na₂S aqueous solution. Both the precursor and the final product were studied by the means of X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The photo-luminescent spectrum of the synthesized ZnS nanocrystals showed their good crystalline nature. Based on this study, the precursor structure-controlling effect was discussed, and in addition, the relevant factors possibly affecting the particle formation and the growth possessed were applied in the discussion to interpret the transformation mechanism. Further research showed that both the structure characters of the precursors and the mass transportation which occurred during the synthesis greatly affected the morphology and organization state of the final products. This research may provide some facts on the structure-controlling approaches along with a general method for the preparation of uniform sulfide nanocrystals.     

Synthesis and electrochemical performance of nanoporous Li4Ti5O12 anode material for lithium-ion batteries

Nanoporous Li₄Ti₅O₁₂ (N-LTO) was prepared by sol–gel method using monodisperse polystyrene spheres as a template and followed by calcination process. The as-prepared N-LTO has a spinel structure, large special surface area, and nanoporous structure with the pore average diameter of about 100?nm and wall thickness of 50?nm. Electrochemical experiments show that N-LTO exhibits a high initial discharge capacity of 189?mAh?g^?1 at 0.1?C rate cycled between 0.5 and 3.0?V and excellent capacity retention of 170?mAh?g^?1 after 100?cycles. EIS and CV analysis show that N-LTO has a higher mobility for Li⁺ diffusion and a higher exchange current density, indicating an improved electrochemical performance. It is believed that the nanoporous structure has a larger electrode/electrolyte contact area, resulting in better electrochemical properties at high charge/discharge rates.