中立型时滞微分方程解的渐近性

本文研究了一类具有分布时滞的中立型微分方程解的渐近性质     

CO_2与正辛烷和正十四烷最小混相压力的实验研究

提出了用细管驱替法测定ＣＯ＿２与正辛烷、正十四烷最小混相压力的方法，研究了液相的组成和温度对最小混相压力的影响；将所测定的值与前人所建立的有关关联式、关联图的预测结果做了比较。结果表明，细管法是可靠的，可推广应用于混相驱生产方案的制定；由实验结果发现，油相组成对注ＣＯ＿２体系最小混相压力的影响很小，但随着温度的升高，最小混相压力增大。     

(弱电统一)模型SU(2)×U(1)×U′(1)研究

许多文献中讨论了SU(2)_L×(T_3)_R×U_V(1)这种特殊的模型,并得到了氢原子物理实验的证明。本文提出了一个更为普遍的弱电统一模型SU(2)×U(1)×U′(1),并将表示参数化,提出了“类氢原子”的新概念。     

Effects of -NO2 and -NH2 functional groups in mixed-linker Zr-based MOFs on gas adsorption of CO2 and CH4

This study was undertaken to evaluate the effects of mixing BDC-NO_2 and BDC-NH_2 linkers in the synthesis of Zrbased metal organic frameworks(Zr-MOFs) on their adsorption and separation of CO_2 and CH_4. Ui O-66 with single or binary-NO_2 and-NH2 samples were synthesized under solvothermal conditions and activated by solvent exchanging using methanol. Structural analyses of the materials were conducted using FTIR, XRD, TGA,SEM,1 HNMR and N2 adsorption/desorption techniques and adsorption of CO_2 and CH_4 at high pressures and different temperatures(273 and 298 K) was investigated. It was found that Ui O-66-NH2 exhibited higher CO_2 and CH_4 adsorption capacities than those of Ui O-66-NO_2. Addition of-NH_2 functional group in Ui O-66-NO_2 could enhance CO_2 and CH_4 adsorption due to the extra CO_2 adsorption sites of-NH_2 functional groups. Addition of-NO_2 functional group to Ui O-66-NH2 at a low loading could also increase CO_2 and CH_4 adsorption, however,a high loading of NO_2 functional group to Ui O-66-NH2 would result in decreased adsorption.     

盐酸氯丙嗪在碳纤维电极上伏安行为研究

通过循环伏安法，研究了盐酸氯丙嗪在不同的pH底液条件下在碳纤维电极上的氧化还原性质，得出了底液pH值与盐酸氯丙嗪的氧化峰电势及峰电流之间的关系，确定了碳纤维电极上伏安法检测盐酸氯丙嗪的最佳实验条件．     

Room-temperature facile synthesis of MnO2on carbon film via UV-photolysis for supercapacitor

A facile UV-photolysis method has been developed to synthesize birnessite-type MnO_2 nanosheets on carbon film at room temperature for supercapacitor electrode materials. The results clearly demonstrated that the specific capacitance of carbon/MnO_2 composite electrodes was controlled by the adjustable UV-photolysis reaction time in KMnO_4 solution. For the optimized composite electrode obtained after 2 h reaction, a superior specific capacitance of 277 Fg~(-1) was achieved at current density of 0.2 Ag~(-1). This finding suggests that UV-photolysis is a potential method to fabricate MnO_2 on carbon film for supercapacitor.     

碳纤维木质复合材料电镜图像分析及形态特征研究

图像分析同图像处理、计算机图形学等研究内容密切相关,而且相互交叉重叠.将改进的抗噪声能力强并考虑邻域像素的模糊C均值聚类算法应用到碳纤维木质复合材料研究中,经过试验验证取得了满意的分割结果.然后对分割结果进行碳纤维特征参数提取,并设置一个碳纤维分布形态参数r来区分电镜图像中碳纤维有无黏连成束.本研究为碳纤维木质复合材料均匀化识别提供了便捷的方法,同时也为后期构建碳纤维木质复合材宏微观模型提供数据支持.     

脉冲阴极弧放电制备碳膜及其性能研究

使用自行搭建的高压脉冲大电源,并且利用PLC的控制SCR触发装置产生微秒级单脉冲进行了弧光放电。在一定电压、一定气压、一定距离下,进行了薄膜制备,对薄膜进行了电镜分析和XRD分析。说明在合适的电压、气压和距离下,用该套设备可以制备出比较均匀、结晶性能比较好的薄膜。     

偶数阶中立型微分方程的振动准则

给出了判断一类n阶微分方程振动性的充分条件,推广和改进了中立时滞微分方程的许多结果。     

包含平面四价碳的一个新家族(英文)

本文预测一类由碱土金属包围的含平面四价碳的新化合物,通过原子轨道分析和对键临界点的拓扑电子密度分析分别研究了其电荷稳定和成键情况。并且研究了分子的磁性质。这些包含平面四价碳的分子体系通过电子和力学性质得以稳定。D4hSi4B4H4还可以用来稳定平面四价氮离子。