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dynamic equilibrium
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dynamic equilibrium
Based on the multifractal trends in short-term dynamic structures of exchange markets, the minimal-intensity dissipation mode is shown to be closest to the dynamic equilibrium mode.
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Dynamic equilibrium of forward and reverse chain reactions in the quinoneimine-hydroquinone system
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Dynamic equilibrium shape of a film of viscous or viscoelastic liquid
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A theoretical and experimental investigation has been made into the dynamic equilibrium shape of an axisymmetric film of liquid formed when a jet encounters an obstacle.
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This model takes into account the multiple inversion of the active center (fast dynamic equilibrium) from the iso-specific to the nonspecific state during chain growth.
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Spectral measurement on selected 7-aminocoumarin derivatives demonstrates that both their absorption and fluorescence emission in a variety of solvents exhibit no detectable change in spectral profile upon addition of certain organic compounds such as phenyl halides, benzene, toluene and cyclohexane. In several cases,however,the fluorescence intensity and lifetime are increased, accompanied by a small shift of emission peak to shorter wavelength, and this fluorescence enhancement is clearly depended on the ... 测定了在有卤代苯等存在时,一些7-胺基香豆素在不同溶剂中的吸收和发射谱及荧光寿命。所得结果表明,具有给电子能力的有机添加物可对非刚性7-胺基香豆素衍生物在极性溶剂中的荧光起增强作用。基于荧光衰变动力学的分析及添加物的荧光增强能力与其氧化电位的线性关系,提出荧光增强作用的机理是添加物通过分子间电荷转移作用使香豆素分子激发态不发光的TICT态向发光的ICT态转化所致。 文摘来源 New types of ZSM-35 zeolites were synthesized by replacing Si or Al ontetrahedron sites with B,P,or Fe in the system C_2H_8N_2-Na_2O-B_2O_3 (or Fe_2O_3)-SiO_2 (or P_2O_5)-H_2O.The hydrothermal conditions were discussed.Their char-acteristics were determined by X-ray powder diffraction,scanning electronmicroscopy,thermal analysis,infrared spectroscopy and BET.These ZSM-35zeolites were compared with respect to their catalytlc behaviors in the iso-merizatiom of o-xylene by pulsed-chromatographic technique.The ... 在C_2H_8N_2-Na_2O—B_2O_3(或Fe_2O_3)-SiO_2(或部分P_2O_5)-H_2O 体系中合成了一类新型沸石——BZSM-35、FeZSM-35和PZSM-35沸石分子筛。讨论了生成单一晶相上述含杂原子沸石的水热合成条件,并表征了其物理化学特性.用脉冲微反技术考察邻二甲苯异构化反应的研究结果表明,BZSM-35沸石使对二甲苯的选择性明显增加,产物中对二甲苯平衡浓度达到23%,这个数值已接近热力学平衡值.而PZSM-35和FeZSM-35沸石均使二甲苯异构化反应的选择性及活性下降. 文摘来源 The present work is to investigate the effect of annealing temperature Tan on microst-ructure and superstructure of HEPP fibers by FRS-XRSA and SAXS. The results show that: FRS-XRSA is a new reasonable method for studying the preferred orientation polymers, It was found that as Tan increases, the melting-crystallization-remelting-processes approach a dynamic equilibrium and the twisted lamellae, which is different from previous literatures, works, extends gradually; long periodicity increases li... 本文是继应用WAXD与SAXS研究退火时间对HEPP结构影响后的第二部分工作,即退火温度的影响。结果指出:FRS-XRSA是研究择优取向聚合物结晶与取向的合理方法;HEPP的X_c~x与L_(kkl)随T_(an)存在着熔融-结晶-再熔融及趋于平稳的过程,当t_(an)=30min,T_(an)≥140℃是较佳结晶条件;与前人工作不同,HEPP中的片晶似呈扭曲状,且随T_(an)增加,扭曲片晶向伸展片晶转变,当T_(an)≥140℃,伸展取向渐趋稳定;SAXS结果指出,d随T_(an)线性增加,d_c在T_(an)从110°—120℃出现剧变增厚,d_0的变化与晶粒的熔融和片晶的增厚相对应,片晶层是由二层晶粒堆砌而成。T_(an)与t_(an)相比,两者对HEPP的结构都有明显的影响。 文摘来源 << 更多相关文摘
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