Sustainable recycling of titanium from TiO2 in spent SCR denitration catalyst via molten salt electrolysis

Spent catalyst used for denitration by selective catalytic reduction (spent SCR denitration catalysts) is one of the important urban mines due to the high conte...     

Cooling curve thermal analysis,phase constitution,and solidification characteristics of cast Mg–5Gd–2Y–xNd–Zr alloys

Journal of Thermal Analysis and Calorimetry - Mg–RE alloys are high-strength magnesium alloys with great application potential. The solidification pathways and microstructure formation of...     

强恒磁场对动物血清中锌铜影响的研究

用ＡＡＳ研究了加磁前后的家兔和小鼠血清中锌，铜含量的变化。结果表明，家兔加磁１６天后血清中锌较加磁前无显著差异（Ｐ＞０．０５），而血清中铜则显著降低（Ｐ＜０．０５）；小鼠加磁１６天，血清中锌，铜较对照组均有显著的降低（Ｐ＜０．０１）。     

ICP-AES法测定林蛙组织中多种微量元素方法研究

本文主要研究ICP AES法测定林蛙中多种微量元素的方法试验 ,实验确定加入 5 0 0mL硝酸、 0 5 0mL高氯酸 ,放置 2 4h后 ,可控恒温电热板上升温至 12 0℃消化溶解 ,湿法制备样品 ,不仅能满足ICP AES法测定的要求 ,而且同时具备样品处理方法简单、快速、准确、经济等特点。其方法的相对误差在 0 17%～ 10 0 %之间 ,精密度在 0 4 3%～ 9 96 %之间。实验数据证明该方法完全可以满足同类样品的等离子体发射光谱法测定微量元素的要求。     

Amplified DNA Detection Sensitivity Using Streptavidin－Biotinylated Protein Complex： Characterization by Electrochemical Impedance Spectroscopy

Thioi-terminated oligonucleotide was immobilized to gold sur-face by self-assembly method. A novel amplification strategy was introduced for improving the sensitivity of DNA hybridiza-tion using biotin labeled protein-streptavidin network complex. This complex can be formed in a cross-linking network of molecules so that the amplification of the response signal will be realized due to the big molecular size of the complex. It could be proved from the impedance technique that this amplification strategy caused dramatic improvement of the detection sensitivi-ty. These results give significant advances in the generality and sensitivity as it is applied to biosensing.     

年龄相关的半线性种群扩散系统的最优收获控制

研究年龄相关的半线性种群扩散系统的最优收获控制问题，证明了最优收获控制的存在性，得到了收获控制为最优的必要条件和由偏微分方程与变分不等式所构成的最优性组，由最优性组确定最优控制．     

K2NaAlF6:Ce3+和KAlF4:Ce3+磷光体的光谱特性

采用高温固相反应法,在Ar气氛中,合成了K2NaAlF6和KAlF4基质化合物.分别测定了它们的结构,并计算了晶胞参数.测定了K2NaAlF6:Ce3+和KAlF4:Ce3+磷光体的激发光谱和荧光光谱,根据Ce3+的光谱结构的特点,讨论了Ce3+的取代格位.     

具有1/ch~2界面的介质光波导的模方程

运用有效折射率法和WKB法导出了具有1/ch~2界面的介质光波导的近似模方程.实算表明用此模方程可方便迅速地分析和计算这类光波导的传输特性,并能得到较为精确的结果.     

一种新型银溶胶的制备、表征及其SERS活性的研究

报道了用一种化学还原方法制备银溶胶的新方法。用紫外-可见光谱和透射电镜研究银纳米粒子的形成过程,粒子形状及粒径分布。结果表明,在反应初期形成球形和棒状两种形状的银纳米粒子,随着反应的进行,大部分的棒状粒子逐渐变为球形粒子,最终棒状粒子少于银纳米粒子总数的3%。因此,最终得到了一种形状均一的,平均粒径为17nm银纳米粒子。同时也用紫外-可见光谱研究了Cl-的加入对这种银纳米粒子光谱性质的影响,结果表明Cl-加速了银纳米粒子的聚集。这种银溶胶有着较高的SERS活性。     

Purification and Structure Identification of Hyaluronic Acid

Polysaccharide produced by mutated strain of Streptococcus zooepidemicus was purified by the procedures including Savage method, quaternary ammonium compound precipitation, DEAE-cellulose(DE52) chromatography and Sephadex G-75 gel filtration. The structure of the purified polysaccharide has been characterized by means of chemical composition analysis,13C NMR spectrum, infrared spectrum and circular dichroism (CD). All the results showed that the purified polysaccharide was hyaluronic acid (HA). The single helix conformation of the purified HA was determined by Congo red experiment. The molecular weight of the HA was about 1.16×106D, which was measured by viscosity method.