NiO／活性炭催化氧化降解水中LAS研究

以NiO／活性炭为催化剂,并加入H2O2,催化氧化降解100mL50mg／L十二烷基苯磺酸钠（LAS）。结果表明,H2O2用量为4．9mrnol／L,温度为50℃,pH值在3～4之间,反应时间为2．0h,LAS降解率接近80％,CODMn。去除率为71.6％。     

IMBR-A/O工艺处理表面活性剂废水的研究

试验采用膜生物反应器(MBR)工艺处理阴离子表面活性剂废水。通过考查水力停留时间、容积负荷对反应器处理直链烷基苯磺酸钠(LAS)效果的影响,确定了最佳的水力停留时间为10.4h,容积负荷为0.058kg LAS/(m3.d),此时LAS的去除率达到最高,为99.5%。结果表明,LAS的去除主要是靠微生物的降解作用。     

Stability of size-based scheduling disciplines in resource-sharing networks

Size-based scheduling strategies such as Shortest Remaining Processing Time first (SRPT) and Least Attained Service first (LAS) provide popular mechanisms for improving the overall delay performance by favoring smaller service requests over larger ones. The performance gains from these disciplines have been thoroughly investigated for single-server systems, and have also been experimentally demonstrated in web servers for example. In the present paper we explore the fundamental stability properties of size-based scheduling strategies in multi-resource systems, such as bandwidth-sharing networks, where users require service from several shared resources simultaneously. In particular, we establish the exact stability conditions for the SRPT and LAS disciplines in various limiting regimes. The results indicate that size-based scheduling strategies may fail to use the available resources efficiently, and in fact cause instability effects, even at arbitrarily low traffic loads, and will therefore not yield optimal delay performance. The qualitative findings confirm the tendency for users with long routes and large service requirements to experience severe performance degradation.     

改性玉米芯活性炭的制备条件研究

研究以玉米芯为原料,十二烷基本磺酸钠为改性剂制取玉米芯活性炭的最佳工艺条件。通过单因素实验和正交试验得出玉米芯活性炭的最佳条件是:振荡温度为35℃,振荡时间为3h,玉米芯与十二烷基本磺酸钠的料液比为1:6,十二烷基本磺酸钠质量分数为9%,各因素的影响顺序为振荡温度料液比LAS质量分数振荡时间,并对普通玉米芯及市售活性炭吸附性能的对比进行了一定的探讨。     

高浓度洗消废水混凝沉淀效果及影响因素研究

针对某洗消废水中含有极高浓度的表面活性剂LAS,直接排放会对环境造成明显破坏的问题,以聚合氯化铝(PAC)为混凝剂,以聚丙烯酰胺(PAM)为助凝剂,以氧化钙(CaO)调节水样pH值,设计均匀实验和单因素实验确定了不同浓度洗消废水混凝沉淀效果和主要影响因子。结果表明,污染物去除效果的主要影响因子随废水浓度而变。当PAC投加量为3 000 mg·L-1、PAM的投加量为15 mg·L-1、CaO投加量为4 000 mg·L-1时,可去除废水中60%以上的CODCr、70%以上的LAS和90%以上的浊度,表明混凝沉淀是处理洗消废水的有效方法。     

基于VBA的测井原始数据处理方法

目前主流测井仪器生成的ASCII,LAS,WIS文件格式,在卡奔BendlinkEx等测井解释软件中无法直接加载。以处理LAS文件适应卡奔导入要求为例,介绍以ExcelVBA为基础的测井数据处理方法。利用VBA进行编程,首先通过"格式化格式"函数处理单个文件,删除卡奔软件加载时多余的信息,保留测井作业范围内各种曲线每个采点上的数值,并生成目的格式TXT文件;然后利用"批量处理"函数,对工区所有测井LAS文件进行批量处理,一次性进行所有LAS文件向BendlinkEx可识别的TXT文件的转换,完成测井解释数据准备工作。该方法极大地降低了重复性数据操作,减少了人工参与和人为错误的发生,提高了工作效率,对地球物理和地质开发研究具有重要意义。     

Evaluation of Fatigue and Rutting Behavior of Asphalt Binder Containing Warm Additive

In this research study, Sasobit as warm additive was used to modify original binder (60/70 penetration grade). The binder fatigue and rutting performance was evaluated through linear amplitude sweep (LAS) and multiple stress creep and recovery test, respectively. Results indicated that 3% Sasobit modified binder has the highest percent recovery value and the lowest J_nr value, but had the highest sensitivity to a sudden increase in the stress level inside the asphalt mixture. The LAS test results demonstrated that the fatigue behavior of asphalt binders modified with 1% Sasobit is the highest one.     

用吸附处理工艺去除饮用水中阴离子表面活性物质的实验研究

采用活性炭、沸石和硅藻土三种常用吸附剂,通过静态实验和动态实验对饮用水中低浓度阴离子表面活性物质(LAS)的去除进行了考察.静态实验结果表明,用吸附法可有效地去除LAS,并且在通常条件下受温度、pH影响不显著,但在有机物如腐殖酸浓度较高的情况下LAS的吸附明显受到抑制.动态实验比较了不同LAS浓度、不同吸附剂对流出曲线的影响,并求出LAS的孔扩散系数和液膜扩散系数.考察LAS和腐殖酸双组分溶液穿透时间及饱和分数的结果表明,腐殖酸为控制化合物,因此实际应用中只需要考虑腐殖酸的去除即可满足LAS的去除要求.     

SiCNW-Cf/LAS复合材料的制备和电磁波吸收性能EI北大核心CSCD

采用热蒸发法,以乙炔黑为碳源,在碳纤维(Cf)布上制备不同摩尔硅碳比的SiC纳米线(SiCNW)。通过浆料浸渍及真空烧结工艺,以不同摩尔硅碳比下制备的SiCNW-Cf作为中间夹层制备SiCNW-Cf/LAS(Li2O-Al2O3-SiO2)复合材料。结果表明:随着摩尔硅碳比的减小,SiCNW的直径不断减小,产量先增加后减小,并在摩尔硅碳比为1∶3时达到最高。摩尔硅碳比为1∶1时,所制备的SiCNW-Cf/LAS具有对电磁波的最低反射损耗-40.9dB(7GHz,3mm)。摩尔硅碳比为1∶3时,所制备的SiCNW-Cf/LAS具有吸收电磁波的最大有效带宽4.61GHz(Ku波段,1.5mm)。SiCNW-Cf/LAS复合材料优异的吸波性能归因于其对电磁波较高的介电损耗、散射损耗以及LAS对材料与空间阻抗匹配的调整。     

Linear alkylbenzene sulfonate detergency behavior in water containing magnesium ions

Detergency performance of linear alkylbenzene sulfonate (LAS) in water containing magnesium ions has been investigated. LAS showed the same behavior with magnesium as with calcium, on a qualitative basis. However, the detergency performance with magnesium is significantly higher than with calcium.