Lutein and lutein esters in marigold flowers by high performance chromatography

Lutein and lutein esters in marigold flowers was quantitatively determined by high performance chromatography (HPLC) with ODS-C18 column. A mixture of CH3CN-CH3OH-CH3COOCH2CH2 with volume ratio of 55:1:44 was used as mobile phase at a flow rate of 1.0mL/min and detection was carried out at 480 nm. The column temperature was about 20℃. The contents of lutein and lutein esters were determined by analytical curve of lutein since lutein and lutein esters have the same spectral characteristics. Determination results of hexane extracts and saponified samples of lutein show that the saponification transforms the esters into free lutein. The increase of the content of dipalmitate and palmitate stearate reveals that the reaction includes transesterifications.     

氧化石墨烯复合膜处理含油废水的研究进展

氧化石墨烯（GO）膜在水处理方面有较好效果,但纯氧化石墨烯膜的稳定性、抗污性差,水通量 低,对于油水分离不能达到最优效果。引入功能材料通过物理和化学方法改性后,得到氧化石墨烯修饰复合膜 和氧化石墨烯基复合膜,其水通量、抗污性和油水分离效率都得到有效提高。文章简要介绍了国内外具有代表 性的氧化石墨烯复合膜在含油废水处理方面的研究,探讨了复合膜去除含油废水的机理,并总结和展望了氧化 石墨烯复合膜材料的发展前景。     

焙烧态水滑石吸附水中钒酸根的研究

采用共沉淀法合成了Mg/Al物质的量比为2∶1的水滑石(LDH),773K煅烧得到其煅烧产物(CLDH),研究了CLDH对钒酸根的吸附性能,分别考察了吸附剂用量、钒酸根浓度、吸附时间和温度等因素对钒酸根吸附效果的影响,并探讨了吸附热力学。结果表明,CLDH对钒酸根有很强的吸附能力,在293～313K温度范围内,CLDH的最大吸附量随着温度的升高而逐渐增大(79.8～92.9mg/g),吸附等温线很好地符合Langmuir方程(R20.999),吸附自由能(ΔG0)为-2.47～-3.81kJ/mol,是自发的物理吸附过程;CLDH吸附钒酸根为熵增过程,熵变为67.23J/(mol·K)。     

提高某厂铅烟灰铟浸出率的研究

对某厂铅烟灰提铟工艺进行了研究,提出了硫酸化焙烧－水浸的浸出工艺流程,使铟的浸出率提高到88％以上。     

Enantioselective extraction of clorprenaline enantiomers with hydrophilic selector of sulfobutylether-β-cyclodextrin by experimentand modeling简

Enantioselective extraction of hydrophobic clorprenaline （CPE） enantiomers from organic phase to aqueous phases with sulfobutylether-β-cyclodextrin （SBE-β-CD） as the selector was investigated with insight into a number of important process variables, such as the type of organic solvent, concentration of selector, pH, and temperature. Equilibrium of the extraction system was modeled using a reactive extraction modcl with a homogeneous aqueous phase reaction. The important parameters of this model were determined experimentally. The physical distribution coefficients for molecular and ionic CPE were determined as 0.3 and 8.93, respectively. The equilibrium constants of the complexation reaction with SBE-β-CD were determined as 152 and 110 L/mol for R- and S-CPE, respectively. Results show that the experimental data agree with the model predictions perfectly. Comprehensively considering the experiment and model, the extraction conditions are optimized and the best extraction conditions are： pH of 6.0, SBE-β-CD concentration of 0.04 tool/L, and temperature of 5 ℃, providing the enantioselectivity （a） of 1.25, the fraction of R-CPE （φR） in aqueous phase of 0.71 and performance factor （pf） of 0.025.     

基于Spark的并行遗传算法在旅行商问题中的应用

传统遗传算法存在早熟现象,而且其在海量数据模型下的求解精度和可扩展性也有待提高。为了改进上述问题,在研究孤岛模型和细粒度模型优势基础上,利用遗传算法自身的并行性,提出一种仿细粒度的粗粒度并行模型,基于spark实现了一种双层并行的遗传算法。将改进算法应用于旅行商问题Berlin52数据集的求解,实验结果表明,与传统的并行模型相比,改进后的算法可以明显缩短计算时间,增大搜索范围,早熟现象也得到了改善。     

基于Pro/E的刀具资源管理系统的研究与开发

针对Pro/E系统刀具管理功能存在的不足，建立了刀具基础数据库与刀具三维参数化模型，介绍了刀具资源管理系统的总体框架，提出了刀具智能化选择的方法，利用Pro/Toolkit二次开发工具开发了刀具资源管理系统并在实践中得到了应用。     

氨基酸的柱前衍生高效液相色谱分析述评

综合报道了氨基酸的各种柱前衍生高效液相色谱分析技术，比较了各自的优缺点，并指出了新的发展方向。     

D-(+)-对二苯甲酰酒石酸插层水滑石的组装与表征

以Mg0.67Al0.33(OH)2(CO3)0.165.0.58H2O为前体(主体),乙醇为分散剂,在pH=6,温度140℃条件下用离子交换法组装了大分子D-(+)-对二苯甲酰酒石酸(DBTA,客体)插层水滑石。并用XRD,FTIR,DSC-TG,ICP,EA等手段对样品进行了表征。结果表明,通过控制离子交换条件,可成功将手性大分子DBTA插入水滑石,得到的材料结构完整,晶相单一,具有良好的层状结构,其层间距由0.76 nm扩大为1.98 nm。DBTA插入后,分解温度由297℃上升到387℃,复合水滑石材料的热稳定性大幅提高。