絮凝法处理酸活化漂洗液

简述了聚丙烯酰胺絮凝剂的类型及絮凝机理，讨论了影响絮凝效果的因素。通过分析获得适宜吸附絮凝条件为：每t拈土用聚丙烯酰胺80g左右，配制成0．05％的胶液分次使用，原矿粒度控制在80目左右，能加速活化浆料粒子尤其是微粒子的沉降，效果十分显著，可提高漂洗液固体物絮凝质量。     

“黄马甲”运动:星火何以燎原

正法国"黄马甲"运动在短短一个月内席卷全国,其自发性、暴力性、扩散性惊人,至2018年12月22日仍无全国性领袖,却已造成8人死亡、数百人受伤、数千人被捕,甚至将"火势"蔓延至比利时、德国、荷兰、加拿大等国。人们在感叹"法国大革命精神不朽"的同时,不禁要思索此次危机的"星火"由何而来,何以迅速燎原,又将对法国产生怎样的影响。     

超市款台结算方式的优化调整

排队现象是一种在现实生活中经常遇见的情景,在超市款台结算时,为了使顾客在支付货款时的排队时间尽量地缩短,提高顾客对超市的满意程度,同时降低因雇用收款员而支付的成本。针对超市款台结算方式的优化调整,即:如何减少顾客的排队时间,使用运筹学排队论理论建立了仿真模型。并对现有系统和倡议系统进行比较,最终得出在多次仿真的情况下倡议系统比较合理,所以应该提倡超市使用此系统。     

X射线荧光分析方法在毒重石-钡解石-钡白云石型钡矿评价中的应用

XRFA technology can effectively locate ore bodies in exploring and evaluating the witherite-barytocalcite-barytodolomite type barium deposit. The regression equation for identifying rich, middle-rich, and poor ore and rocks is BaO=0.5614-3.127×10^-5I_f. The X-ray fluorescence intensity limitation for ore and rock is I_f=24 350, those for the poor ore and middle-rich ore, and the middle-rich ore and rich ore are I_f=29 467 and I_f=33 000, respectively. The determined X-ray fluorescence intensity curves vary little in amplitude, and the patterns go gently and stable. So XRFA can be used to survey geological-geochemical profiles and trace back ore bodies. There is no systematic error between the ore grade measured by XRFA and the Ba content measured by chemical analysis. This confirms the effectiveness of XRFA in evaluating this type of barium ores.     

一类二阶时滞微分方程解的渐近性态

本文讨论一类二阶时滞微分方程解的渐近性态,得到两个比较定理.     

镧掺杂纳米TiO2应用助剂筛选及其对农药残留的光催化降解效果

通过润湿分散剂(十二烷基苯磺酸钠ABS-Na、木质素磺酸钠SL和羧甲基纤维素钠CMC)和载体(白炭黑、高岭土)的筛选,确定了60%稀土镧掺杂纳米TiO2可湿性粉剂(WP)的最优配方。试验结果表明:十二烷基苯磺酸钠为2%,木质素磺酸钠6%,采用高岭土作载体,可湿性粉剂的悬浮率达到了98.12%,润湿时间为4.09 s,且冷贮、热贮合格。通过克百威溶液在太阳光下的消失情况来研究La-TiO2可湿性粉剂的光催化降解效果。试验表明:稀土镧掺杂后的纳米TiO2光催化活性得到了提高,且使用La-TiO2可湿性粉剂能进一步提高克百威的光催化降解效果,当降解效果达最大时,La-TiO2最佳用量为0.2 g.L-1,而直接使用La-TiO2粉末,其最佳用量为0.4 g.L-1。     

Gain and Noise Figure of a Double-Pass Waveguide Amplifier Based on Er/Yb-Doped Phosphate Glass

A waveguide amplifier is fabricated by Ag^＋-Na^＋ two-step ion exchange on Er/Yb-doped phosphate glass. The spectroscopic performance of glass and the properties of channel waveguide are characterized. A double-pass configuration is adopted to measure the gain and noise figure （NF） of the waveguide amplifier, and the comparison of gain and NF for the single and double-pass configuration of the waveguide amplifier is presented. The results show that the double-pass configuration can make the gain increase from 8.8dB （net gain 2.2dB/cm） of the single-pass one to 14.6dB （net gain 3.65dB/cm） for small input power at 1534nm, and the NF are all lower than 5.5dB for both the configurations.     

3种芳胺系物质测定关联结构荧光光谱的量子化学研究

采用量子化学半经验THF/PM3方法,RB3LYP/6-31G方法和RHF/6-31G方法分别对测定苯胺系的关联结构,测定间甲苯胺的关联结构和测定对氨基苯甲酸的关联结构进行构形伏化和振动分析,证明其结构的稳定性,并用RHF/PM3-CIS方法分别计算了它们的荧光光谱,所得结果与实给值基本一致.