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961.
A second order nonlinear differential equation
相似文献
962.
We study the inhomogeneous deformation of a wedge of an incompressible generalized power-law Neo-Hookean material. We find solutions which have a boundary layer structure, in the sense that adjacent to the boundary the solution is inhomogeneous, while in the core region the solution is homogeneous. It is found that such solutions have an associated pressure field that is bounded. Inhomogeneous solutions are also possible when the pressure varies logarithmically with the radial coordinate. We also establish explicit exact solutions for specific values of the parameter. The results reduce to the Neo-Hookean solution when the power law exponent is set to unity. 相似文献
963.
钽离子掺杂对LiFePO4 / C物理和电化学性能的影响 总被引:2,自引:0,他引:2
采用PAM(聚丙烯酰胺)模板-溶胶凝胶法在惰性气氛下合成钽掺杂的LiFePO4/C复合正极材料,考察了钽对目标化合物的物理和电化学性能的影响。研究结果表明,0.33C的电流下充放电时,掺杂前后第2个循环的放电容量分别为138.6 mAh·g-1和155.5 mAh·g-1,循环20次后容量为141 mAh·g-1和156 mAh·g-1。电化学交流阻抗表明,掺杂后的材料阻抗Rct从180 Ω减小到120 Ω。振实密度比掺杂前提高0.312 g·cm-3。 相似文献
964.
965.
Background Pillar[n]arene(PA[n])contains a symmetrical structures,where para-bridge connection between the units looks like a column-like or pillar shape and polygonal structure from side and top views,respectively.The attached groups to the PA[n]are pointing towards the opposite directions along the columnar axis. 相似文献
966.
建立了分散固相萃取净化-超高效液相色谱-串联质谱法快速测定鱼和虾中3类(磺胺类、喹诺酮类、氯霉素类)18种抗生素及2种三苯甲烷类(孔雀石绿、隐色孔雀石绿)兽药残留。样品经磷酸氢二钾溶液水解分散,乙腈提取,提取液经氯化钠脱水、盐析后取乙腈层,经旋转蒸发仪浓缩至近干,残留物用甲醇定容至1.0 mL,C18和PSA(N-丙基乙二胺)填料分散固相萃取净化,过滤膜后经ZORBAX C18色谱柱(50 mm×2.1 mm,1.8 μm)分离,正、负离子多反应监测模式采集数据,同位素内标法定量。实验结果表明,20种兽药在0.2~300 μg/L范围内具有良好的线性关系,检出限为0.1~0.6 μg/kg,定量限为0.3~1.8 μg/kg,相关系数均大于0.99。在1、5和20倍定量限加标浓度水平下,平均回收率为72.5%~118%,相对标准偏差(RSD)为1.9%~9.8%。该方法具有前处理简单、检测效率高、成本低等优点,适用于鱼和虾中多类兽药残留的同时测定。 相似文献
967.
Surfactant molecules containing hydrophobic long alkyl chains and hydrophilic groups can organize into various micellar structures both in bulk solution and at interface. However, because of the dynamical nature of surfactant micelles, efforts directed at fixing their structures in bulk solution by polymerization have met with limited success. Herein, we report a unique and simple method of stabilizing surface micelles of a low molecular weight surfactant 11-acryloyloxyundecyltriethylammonium bromide (AUTEAB) through in situ intramicellar polymerization on the mica surface. Atomic force microscopy (AFM) observations show that the cylindrical micellar structure formed by AUTEAB monomers at the mica/water interface is preserved after the in situ polymerization, and the stability of the polymerized surface micelles is greatly enhanced compared with that of the unpolymerized ones. 相似文献
968.
以cis-1,2-二氰基乙烯-1,2-二硫醇钠(Na2(mnt))、2,2′-联吡啶-1,1′-二氧化物(bipyO2)和NiCl2为原料,合成了一种具有大共轭体系的混配型配合物.用元素分析、差热 热重分析、摩尔电导、红外和紫外光谱对配合物进行表征.该配合物化学式为Ni(mnt)(bipyO2),平面正方形结构,属电中性物质,热分解温度高于335 ℃.不溶于水和常规有机溶剂,可溶于DMSO.该配合物是一种氨敏材料,用它制作的传感器对氨气具有良好的敏感性和选择性;当工作电压为10 V时,在氨气浓度小于2.6 mmol•L-1的范围,传感器的输出信号对氨气呈线性响应.传感器的平均回收率为100.2%,响应时间为20 s,恢复时间为45 s.可用于微量氨的定量分析. 相似文献
969.
Synthesis, Structure and Conductivity of the New Charge-transfer Salt (ET)_2(CH_2=CH-CH_2-SO_3)·H_2O
Zhi LIU Qi FANG* Wen Tao YU Min Hua JIANG De Qing ZHANG Dao Ben ZHU State Key Laboratory of Crystal Materials Shandong University Jinan Institute of Chemistry The Chinese Academy of Sciences Beijing 《中国化学快报》2003,14(4)
ET is one of the most famous electron-donor molecules, which forms charge-transfer complexes (abbr. CT-complexes) with various types of counterions. These complexes have received intense attention because a wide range of physical properties such as conductivity and superconductivity1, ferromagnetism2-4 and nonlinear optical properties5 was found in these materials. Although the majority of the ET-based CT-complexes were prepared by combining with inorganic counterions, CT-complexes with o… 相似文献
970.
A novel molecular entity vacancy model was proposed to describe thermodynamic properties in a multicomponent solution system using its binary interaction parameters only. A derivation of the model for its general expression has been shown in detail. Under some special conditions, this model may be reduced to Flory–Huggins equation, Wilson equation and non-random two liquids (NRTL) equation as well as molecular interaction volume model (MIVM), respectively, and can be verified by Gibbs–Duhem equation, and can express thermodynamic properties of partially miscible systems. The predicted activities are in good agreement with experimental data of some liquid alloys. The results show that the model is of better predictability and reliability because it has a certain physical basis. 相似文献
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