应用微型探针测量油藏物理模拟饱和度变化

采用了电极系测量原理,用先进的双压模技术和耐氧化、耐腐蚀的高技术材料制造出了能够测量油藏物理模拟中动态饱和度变化的微型探针;应用饱和度探针测量出了不同实验的一维模型饱和油、水驱油过程中不同位置的饱和度变化;应用Buckley-Leverett方程理论计算出一维模型出口的端面饱和度,并与靠近出口位置实际测量的饱和度进行了对比分析,实验结果与理论计算结果验证了用该项技术测量物理模拟饱和度变化是可行的.     

电子信息工程专业实践教学体系的构建与实施

根据我校电子信息工程专业的课程体系的设置与整体优化,分析了影响当前高校人才培养质量的实践教学环节的基本特点,对实践教学体系的构建进行了阐述,并提供了实践教学的实施方案。     

“学教翻转”教学模式的开发与应用

"学教翻转"是一种先学后教的颠覆传统课堂教学的教学模式,通过对课堂教学中教与学活动的颠倒安排,实现以学员为中心的个性化教学,培训效果显著。本文介绍了"学教翻转"教学模式的理论依据及内涵,阐明了"学教翻转"教学环节实施步骤、方法及重点关注事项,分析了"学教翻转"在培训中的实际效果,指出了"学教翻转"在企业培训中的推广价值和应用前景。     

红甜菜甜菜红素降血脂作用的实验研究

探讨红甜菜甜菜红素对高血脂小鼠的降血脂效果。通过喂食高脂饲料的方法建立高血脂症小鼠模型,将受试样品分别以高、中、低三个浓度剂量给高血脂小鼠灌胃,空白组和高血脂模型组灌胃蒸馏水,连续灌胃30d后,拨眼球取血,进行总胆固醇、甘油三酯、低密度脂蛋白胆固醇和高密度脂蛋白胆固醇浓度的测定。结果显示:红甜菜甜菜红素能降低高血脂小鼠血液中总胆固醇(中剂量组p<0.05,高剂量组p<0.01)、甘油三酯(中剂量组p<0.05,高剂量组p<0.01)和低密度脂蛋白胆固醇(中剂量组p<0.05,高剂量组p<0.01)的浓度,提高高密度脂蛋白胆固醇(高剂量组p<0.05)的浓度。甜菜红素具有明显的降血脂功效。     

Synthesis and characterization of porous 4VP-based adsorbent for Re adsorption as analogue to 99Tc

Technetium (99Tc),a major fission product in nuclear reactors,of high yield,long-half-life and high mobility in the environment must be removed in nuclear fuel reprocessing.Considering rhenium (Re) and Tc are both VIIB elements,Re is a good chemical analogue to 99Tc.Herein,we use Re as a substitution of 99Tc to study adsorption and desorption behavior.Porous 4-vinylpyridine-divinylbenzene-based (4VP-DVB) adsorbent containing tertiary amine groups is synthesized by suspension polymerization and characterized by BET,TGA,SEM and laser particle size analyzer.The adsorbent has high adsorption efficiency toward Re(Ⅶ) in 0.1 mol/L nitric acid solution,and the adsorption equilibrium can be achieved in 30 min.The adsorption kinetics of Re(Ⅶ)follows pseudo-second-order rate equation,the adsorption isotherm matches well with the Langmuir isotherm,and the adsorption capacity of Re(Ⅶ) on 4VP-DVB adsorbent is 352.1 mg/g at 298 K.Thermodynamic study reveals that the adsorption process is exothermic.This adsorbent is of separation convenience when a fixed-bed column is used,compared to the batch adsorption treatment.     

基于前馈控制器的数字阀动态性能研究

数字伺服阀是未来伺服阀发展的一个重要方向。数字伺服阀大多采用驱动机构直接驱动阀芯滑动的方式,驱动机构的动态性能很大程度上决定了整阀的性能,根据负载特性和实际应用对高动态的要求,在传统PI控制的基础上,加入了前馈控制器,并对其进行了控制算法理论模型等效、幅频和相频分析、程序算法设计及具体实验验证,实验结果表明,前馈控制的引入有效的改善了数字阀的动态性能。     

铁煤集团电信综合业务管理系统的建设

随着电信市场的日益宽松和活跃,企业专网的职能也在发生着变化,从单纯服务与本企业的生产管理转向面向市场.为加强管理、提高竞争力、更好地服务于用户从而提高企业经济效益,建立这套基于大型数据库的专网电信企业内的电信业务管理平台,已成必然.其目的就是要构造全新的通信部门全局计算机管理模式,实现信息最大限度共享,极大提高各岗位工作人员工作效率和通信部门的管理水平,赢得用户的信任,占领有限的市场,降低运营成本,提高企业竞争能力,从而保障企业健康、稳定、持续的发展.     

Impact of ripening on manganese-doped ZnSe nanocrystals

We examine the impact of growth kinetics on the incorporation of Mn dopants into ZnSe nanocrystals. We synthesize such particles, also known as colloidal quantum dots, and use optical spectroscopy to extract information about the average number of Mn impurities per nanocrystal as the reaction proceeds. We find that this number increases with particle growth until the Zn and/or Se precursors are depleted in the reaction solution. If the reaction is continued further, then ripening of the colloid begins and the average number of Mn per nanocrystal decreases, even as the particles slowly increase in size. We show that this effect, which is detrimental for enhanced doping, can be avoided if the reactant concentration is maintained by addition of more reactants. We consider several explanations and conclude that intraparticle ripening, in which material is redistributed on the same nanocrystal due to evolution of the particle shape, is the most consistent with experimental observations.     

Enhanced fracture properties of ZrB2-based composites by in-situ grown SiC nanowires

To improve the fracture properties of ZrB₂-based composites, SiC nanowires (SiC_nw) were introduced into the powder mixtures via an in-situ growth method and the composites were fabricated by hot pressing. Microstructure observations found that the SiC_nw with a diameter of less than 100?nm presented twisted morphology and homogeneously distributed among ceramic particles. It was also found that the SiC_nw could inhibit the grain growth of ZrB₂-based composites. Compared to that of composites without SiC_nw, the fracture toughness and the work of fracture for the composites with SiC_nw were 7.17?MPa?m^1/2 and 205?J?m^?2, which increased by 61.1% and 91.6%, respectively. The main enhancing mechanisms could be associated with the obvious crack deflection, crack branching and pull out of SiC_nw. The SiC_nw could refrain the crack opening and reduce the stress intensity in front of crack tips, which absorbed more energy and improved the fracture properties.     

棉浆黑液-酚醛复合凝胶堵剂的制备与性能评价

为有效利用棉浆黑液、减少环境污染,以碱法棉浆黑液、苯酚、甲醛和聚丙烯酰胺为原料,通过水热法制备了黑液-酚醛复合凝胶,通过红外光谱、热重分析和扫描电镜对凝胶结构进行了表征,研究了苯酚加量对凝胶的影响,评价了凝胶的耐盐性、耐酸碱腐蚀性和封堵效果。结果表明,黑液-酚醛复合凝胶网络致密紧凑,热分解温度为200℃。苯酚加量为2%～4%的凝胶的成胶时间为24～14 h,含水率为72%～75%,吸水倍数为3.60%～3.92%。该凝胶具有黏度低、易泵入的优点,且具有良好的耐盐、耐酸碱性能。凝胶的封堵效果良好,对人工模拟岩心的封堵率大于99%。利用棉短绒黑液制备油田堵剂,不仅可以改善黑液污染,还可降低稠油开采成本。图4表3参13