Performance of SBR-Modified Asphalt Yufeng Cong

A dose of SBR modifier added to asphalt can improve asphalt's performance in stability, permanence, viscosity, and resistance to aging. Better application performances of asphalt pavement are affected directly by proper SBR modifying. This paper shows some investigations that confirm the relationship between the addition of SBR with the structure and the properties of SBR-modified asphalt. This paper also discusses the modified asphalt high temperature property, low temperature ductility, and mechanism of SBR-modified asphalt. The addition of SBR modifier showed an increase in viscosity, softening point, and elastic recovery of modified asphalt with rising temperature. When the temperature rises, the improvement of SBR-modified asphalt in softening point, elastic recovery, and visco-toughness result from SBR cross-linking. Although the lengths of low temperature ductility of SBR-modified asphalt are increased, the viscosities of modified asphalt increase; however, the softening point between the upper layer and lower layer were about 1.8°C after the isolated experiment.     

一点法试井资料处理新方法

目前,在处理一点法试井资料时,取函数α为定值0.25来计算气井的无阻流量,其结果与修正等时试井有很大的偏差。针对上述问题,充分利用了一点法测试不稳定阶段的数据,在理论上推导出了α与有关参数的关系式,利用这个关系式能计算出α的准确值,从而得出气井准确的无阻流量。应用实例证明了新方法是比较可靠的,为以后计算气井无阻流量和开采配产作业提供了准确的依据。     

大牛地气田异常修正等时试井资料求取产能方法

大牛地气田为低渗-致密气田,因存在启动压力梯度等因素,修正等时试井曲线按常规方法处理出现异常,无法准确获取气井的产能方程.采用LIT法和异常曲线校正法对气田异常试井资料进行了重新处理,最终获得气井产能方程,为同类气藏产能试井可能出现的异常资料处理解释探索了新的途径.     

FCC油浆提高废胶粉改性沥青热存储稳定性试验

废胶粉用FCC油浆进行预处理后用于沥青改性,制备出沥青与胶粉间相容性好、高温存储性能稳定的胶粉改性沥青.考察并得出相关工艺条件,同时应用多种评价手段分析改性后沥青的性能,结果表明,预处理后胶粉改性沥青的高温存储性能稳定,低温时柔韧性、抗开裂性能明显提高,高温时稳定性、抗车辙能力及弹性回变性能增强,沥青粘弹区间明显变宽.     

添加剂对工业齿轮油性能影响的研究

研究了硫化烯烃、磷酸酯胺盐、硫磷酸酯极压抗磨剂,含氮杂环衍生物多功能添加剂和防锈剂等,对工业齿轮油抗乳化性能、极压抗磨性能、防锈性能的影响;以及硫化烯烃、磷酸酯盐极压抗磨剂与含氮杂环衍生物多功能添加剂之间的协和效应。试验结果表明:1.2%~1.6%复合添加剂调制的CKD220工业齿轮油中,磷酸脂盐的正确选用可以提高齿轮油的抗乳化性能、防锈性能和减少防锈剂用量。硫化烯烃与磷酸脂盐、含氮杂环衍生物多功能添加剂的合理组合,可以提高齿轮油的极压抗磨性能和防锈性能,减少添加剂总加剂量。     

废胶粉改性沥青性能影响因素研究

分析了制备工艺、胶粉粒径以及外加添加剂对胶粉改性沥青常规使用性能和稳定性的影响。结果表明:在一定的范围内,胶粉粒径细,对沥青性能的改善较好;加入相容剂可改变沥青胶体体系的溶剂化层的结构和性质;交联剂的加入,增大了体系的稳定性。     

修正辛-准粒子法地震波数值模拟

基于Hamilton力学,从分子动力学角度建立了针对地震波传播的空间离散的准粒子体系,在该体系中各个粒子仅与上、下、左、右和4个对角粒子发生相互作用,且认为其作用力和相对位移呈近似线性关系,给出了粒子间的相互作用系数,并将该体系变换至Hamilton系统。在时间离散上,通过在二阶辛格式的基础上构建了一个新的修正辛格式,该格式具有三阶时间精度,并在理论上分析了其数值频散和稳定性。修正辛格式所有的系数均为正系数,符合时间演进方向,且具有长时间计算能力。为了测试修正辛格式和空间准粒子体系的准确性,利用拉梅问题验证对弹性波数值模拟的计算精度和效率,为了测试稳定性,选取Sigsbee 2B速度模型进行验证。结果表明,修正辛格式在数值频散压制和数值稳定性提升等方面具有明显的优势。     

Phase Inversion Strategy to Flexible Freestanding Electrode: Critical Coupling of Binders and Electrolytes for High Performance Li–S Battery

Development of flexible and freestanding electrode is attracting great attention in lithium–sulfur (Li–S) batteries, but the severe capacity fading caused by the lithium polysulfides (PSs) shuttle effect remains challenging. Herein, a completely new polymeric binder of polyethersulfone is introduced. Not only it enables massive production of flexible/current‐free electrode by a novel concept of “phase‐inversion” approach but also the resultant polymeric networks can effectively trap the soluble polysulfides within the electrode, owing to the higher hydrophilicity and stronger affinity properties than the routine polyvinylidene fluoride. Coupling with polysulfide‐based electrolyte, the Li–S cell shows a higher capacity of 1141 mAh g^?1, a lower polarization of 192 mV, and a more stable capacity retention with 100% Coulombic efficiency over 100 cycles at 0.25C. The advantages of favored binder and electrolyte are further demonstrated in lithium‐ion sulfur full battery with lithiated graphite anode, which demonstrates much improved performance than those previously reported. This work not only introduces a novel strategy for flexible freestanding electrodes but also enlightens the importance of coupling electrodes and electrolytes to higher performances for Li–S battery.     

二茂铁及其衍生物修饰电极的研究

二茂铁及其衍生物修饰电极在电催化、电分析和生物传感器等方面具有重要的应用前景。本文对二茂铁及其衍生物修饰电极分类、制备、特点及其应用等方面的研究现状作了归纳和评述。提出了今后研究工作的方向。