深井破碎围岩条件下煤巷锚杆构件合理配套

基于徐州矿区张小楼井24302工作面运输平巷的地质条件，在深井破碎围岩条件下进行了煤巷锚杆支护试验，介绍了锚网带索支护技术参数和不同构件配合支护的巷道矿压显现．根据顶板锚杆螺母撕裂和穿过托板与钢带导致的锚杆支护失效问题，在实验室完成了锚杆、托板、钢带和螺母等支护构件配合的力学性能试验．试验表明：直径20mm的螺纹钢锚杆杆体性能稳定，破断载荷均在186kN，杆体和螺母的螺纹配合完好，顶圆底四方螺母能与托板和钢带很好地配合，外接圆直径为38mm的六方螺母与托板和钢带不能很好地配合．深井高应力破碎围岩条件对锚杆支护系统中的锚杆、锚固剂、托板、钢带和螺母等构件的力学性能配合要求高，它们的力学性能应基于锚杆的破断力合理配套．     

准噶尔盆地乌夏地区稠油稠变阶段及其成藏特征分析

乌夏地区稠油分布于距油源玛湖凹陷远距离的断裂上盘中生界超覆尖灭带上,埋深浅,构造简单。表现出高密度、高粘度、高沥青质、高酸值、低蜡、较高凝固点的特征,体现了生物降解原油的基本特征。根据其饱和烃色质谱特征、生物标志化合物降解程度、三环萜烷和孕甾烷含量等将其降解稠变过程划分为4个阶段。长距离通过不整合面运移遭受水洗、生物降解是导致原油稠变的主要因素,其成藏主要与不整合和浅部正断层有关,在后期成藏中对油气有重要的封堵作用。     

前躯体浸渍法制备VO_x/Al_2O_3及其催化二甲醚制甲醛性能

采用前躯体浸渍法合成了VOx/Al2O3催化剂,并采用XRD、Uv-Vis、H2-TPR、NH3-TPD以及吡啶吸附红外等技术对催化剂材料的结构和性能进行了表征,同时考察了催化剂上二甲醚制备甲醛的反应性能。XRD的测试表明,V的氧化物在载体上处于高度分散状态,没有独立的V2O5晶相峰存在。Uv-Vis的测试表明,前躯体浸渍法制备的催化剂较之常规浸渍法制备的催化剂位于更高波数,因而VOx物种在载体表面的分散更加均一。H2-TPR的结果表明前躯体浸渍法制备的催化剂,相对更加容易还原,催化氧化能力更强。NH3-TPD以及吡啶吸附红外的结果表明前躯体浸渍法制备的催化剂相对具有较少的B酸和较弱的酸性。前躯体浸渍法制备的VOx/Al2O3催化剂在DME选择氧化制备甲醛的过程中,具有更高的甲醛的选择性和收率,选择催化的性能更佳。     

视觉文档图像中反渗噪声的去除方法

提出根据直方图特征去除视觉文档图像反渗噪声的方法.对于灰度直方图呈双峰特性的噪声图像,选取适当区域分别进行增强或归一化处理以达到去除反渗噪声的目的;而对于直方图呈单峰特性的含反渗噪声图像,建立了一种基于背景分离的新算法.实验结果表明,该方法可以有效去除视觉文档图像中的反渗噪声.     

电子自旋共振波谱法检测含骨类食品的初步研究

电子自旋共振(Electron spin resonance,ESR)波谱测定是检测含骨类食品自由基的有效方法之一.本工作研究了辐照诱导的含骨类食品的ESR波谱特征、样品制备方法及辐射剂量-效应关系.结果表明,辐照前后ESR波谱图形、g因子和△H皆有明显差异,据此很容易区分辐照与未辐照含骨类食品样品;冷冻干燥和磨碎是样品制备过程中的关键步骤;吸收剂量(0.3-10.1kGy)与ESR信号强度有良好的线性关系;ESR信号的相对强度还与动物种类有关.这为制定我国含骨类辐照食品的ESR检测方法标准提供了依据.     

A kinetic study of Am(III)/humic colloid interactions

The interaction kinetics of the Am(III) ion with aquatic humic colloids is investigated under near-natural conditions by column experiments with a sandy aquifer sample rich in humic substancesforthe appraisal of the migration behavior of Am. The association and dissociation kinetics of the Am ion onto and from humic colloids control the migration of colloid-borne Am. As the contact time between Am and humic colloids prior to introduction into a column is increased, the mobility of colloid-borne Am is enhanced and hence the recovery of Am in the effluent increases. On the other hand, an increase of the migration time and residence time in column, respectively, reduces the Am recovery. Considering these experimental results a refined version of the kinetic model KICAM (Kinetically Controlled Availability Model), which suggests different Am binding modes with humic colloids, was developed. Applying KICAM it is possible to predict static and dynamic experiments affected by the kinetically controlled Am/humic colloid interactions over the range of 1 h up to several months. However, to apply these experimental results to long-term conditions, the Am binding scheme as proposed in KICAM needs to be verified. This paper provides, therefore, a basis for a better understanding of the colloid-borne Am migration in porous aquifer systems.     

一种新的基于相位调制跟踪的电源并联控制方法

研究了抗干扰能力强、控制可靠性高的数字化并联控制技术，提出了一种数字均流控制方法一相位调制跟踪法。该方法将每个模块有功功率、无功功率和同步信号通过相位调制的方法变换为相位变化的周期脉冲信号，然后通过锁相同步的方法使所有并联逆变器模块都跟踪相位最超前，即输出功率最大模块的脉冲信号，从而实现功率均分。该方法具有控制信号分辨率高，抗干扰能力强以及稳定性好等优点，提高了系统均流控制精度；同时，自然实现了民主主从控制，具有好的控制冗余性。克服了线路阻抗变化对系统均流精度的影响。实验结果表明，该方法能较好地实现逆变模块的功率均分，模块间输出电流偏差小于1％。     

高取代度氰乙基纤维素与二醋酸纤维素共混中空纤维纳滤膜的研制

采用高取代度氰乙基纤维素与二醋酸纤维素共混为膜材料,丙酮、二氧六环混合溶剂,以有机醇为主、加入适量其他添加剂为致孔剂,通过冰水凝胶浴干湿法纺丝,制得性能良好的中空纤维纳滤膜,该膜在给水质量浓度1 800 mg/L、操作压力为0.6 MPa、水温25℃条件下,对二价盐CaCl2、一价盐NaCl的水溶液的脱盐率分别大于90%和小于60%,水通量均大于3.5 mL/(cm2.h).还讨论了膜液的组成和纺丝条件对膜性能的影响.     

Excitation of capillary waves in strongly absorbing liquids by a modulated laser beam

Several mechanisms for the excitation of capillary waves and for the development of the average deformation of a liquid surface under the action of a modulated laser beam are considered. The amplitude of the capillary wave in a strongly absorbing solution of the dye LDS 751 in ethylene glycol is experimentally studied as a function of laser intensity. Consecutive changes in the predominant mechanism of the excitation with increasing laser intensity are observed and described. At low laser intensities the mechanism connected with the creation of a surface tension gradient prevails. This mechanism becomes nonlinear with increasing influence of the convective motion. In addition, pressure pulsations of the convective flow start to contribute significantly to the generation process. The resonances of capillary waves in a cylindrical container are also investigated and used for determining the surface tension and viscosity of the liquid.