2,2-二硝基丙醇最新合成进展及其应用

综述了氧化硝化法、氯化硝化法、铁氰化钾路线、电化学法等合成2,2–二硝基丙醇(DNPOH)的进展,并且比较了它们的特点,最后提出了洁净的电化学法是很有前途的绿色合成方法。另外,简述了DNPOH作为关键中间体在合成含能增塑剂和含能黏合剂中的应用情况。     

基于网络的地理信息系统研究

基于网络的地理信息系统是近年来地理信息系统发展的方向之一。文中介绍了国家基础设施（NII）和国家空间数据基础设施（NSDI）,分析了信息高速公路（ISH）与地理信息系统之间的关系。提出网络地理信息系统的组织方式及网络地理信息系统的模型。     

Hierarchical flaky porous carbon derived from waste polyimide film for high-performance aqueous supercapacitor electrodes

The development of electric vehicles is increasing the demand for supercapacitors, for which carbon materials can make excellent electrodes. In this study, waste scraps of polyimide (PI) film were used to fabricate several flaky porous carbon materials for use as supercapacitor electrodes. The pore structure and functional groups of the porous carbons were tailored by KOH activation. The relationships between pore structure, the carbon matrix, functional groups, and electrochemical performance were investigated via N₂ adsorption, XRD, Raman spectroscopy, FT-IR, XPS, and electrochemical measurements. The flaky porous carbon materials have a graded distribution of hierarchical pore structures and are rich in O/N functional groups. They have an outstanding capacitance retention rate and a high specific capacitance of 482 F g^?1, which is higher than those of PI film-based porous carbons prepared by physical activation and of commercial activated carbon electrodes. Their flaky structure endows them with lower impedance than commercial AC. The materials were used to fabricate electrodes for symmetrical supercapacitors, which displayed high energy densities and excellent cycling stability. This work provides an environmentally benign strategy for the re-use of waste PI film.     

虾青素微球对酸奶品质与风味的影响

以虾青素微球、鲜牛乳为原料,制备虾青素微球酸奶,评价虾青素微球对酸奶的乳酸菌活菌数、质构、感官评分、贮藏期虾青素稳定性的影响,并采用顶空气相色谱-离子迁移谱对酸奶挥发性有机物进行分析.结果 表明:虾青素微球对乳酸菌活菌数有积极作用,对酸奶的质构无显著性影响(P＞0.05);当虾青素添加量为6 mg/100 g时,虾青素...     

碳酸锶渣中锶的盐酸-氯化铵浸取工艺研究

随着电子、有色金属、航空航天等行业的快速发展,锶及锶盐的市场需求越来越大。以碳还原法生产碳酸锶的含锶工业废渣为原料,以盐酸-氯化铵为浸取剂,探究了浸取时间、浸取温度、盐酸-氯化铵物质的量比对废渣中锶浸取率的影响。在单因素实验的基础上,采用3因素3水平的Box-BehnKen响应面分析法对锶浸取工艺做了优化,确定了浸取锶的最优工艺条件。结果表明：在盐酸与氯化铵物质的量比为4.32、浸取时间为104 min、浸取温度为33 ℃的最优工艺条件下,经过4次重复性实验,所得的锶浸取率平均值为95.15%,标准偏差为0.146 2,相对标准偏差为0.153 7%,与预测值相对误差仅为0.17%,所选因素对锶浸取率影响由大到小顺序：浸取时间、盐酸-氯化铵物质的量比、浸取温度,以期为锶渣中锶资源的回收利用提供参考。