Nonlinear analysis of laser droplet generation by means of 0–1 test for chaos

We apply the recently improved version of the 0–1 test for chaos to real experimental time series of laser droplet generation process. In particular two marginal regimes of dripping are considered: spontaneous and forced dripping. The outcomes of the test reveal that both spontaneous and forced dripping time series can be characterized as chaotic, which coincides with the previous analysis based on nonlinear time series analysis.     

High-performance Cu/ZnO/Al2O3 catalysts for methanol steam reforming with enhanced Cu-ZnO synergy effect via magnesium assisted strategy

Methanol steam reforming (MSR) is an attractive approach to produce hydrogen for fuel cells.Due to the limited catalyst loading volume and frequent start-ups an...     

Synthesis of tetrasubstituted thiophenes from pyridinium 1,4-zwitterionic thiolates and modified activated alkynes

Pyridinium 1,4-zwitterionic thiolates were applied to a formal [3 + 2] annulation reaction with modified activated alkynes, affording various tetrasubstituted thiophenes with aryl, alkenyl, alkyl or silyl group at the special position. The structural modification of alkyne substrates enabled the synthesis of diverse thiophenes to be achieved using the pyridinium 1,4-zwitterionic thiolates as the sulfur-containing building blocks. This approach is metal-free and catalyst-free.     

亚硝基甲胺异构化的量子化学研究

此文用ＭＮＤＯ方法研究了亚硝基甲胺异构化反应的机理。     

The 23 K superconducting phase YPd2B2C

We have carried out a systematic structural, electric, and magnetic study on Y---Pd---B---C samples with different compositions with emphasis on the as-cast and annealed YPd₅B₃C_0.3 which was first reported to superconduct at 23 K by Cava et al. We found that the tetragonal body-centered YPd₂B₂C with lattice parameters a=3.71 Å and c=10.81 Å is the phase responsible for the 23 K superconductivity and that YPd₂B₂C is metastable, which is consistent with the suggestion made by Cava et al. [1]: it is not stable at high temperatures nor stabilizable by Ni doping, although its isostructural compound, YNi₂B₂C, exists. Two new phases with Y:Pd ratios of 1:7 and 2:3, respectively, have also bee detected.     

非等距三次样条(Ⅰ)型插值函数余项渐近展开

摘要本文利用基样条插值方法,给出非等距I型三次样条插值误差的余项渐近展开式,推广了文献[1]中的结果。     

表面效应对γ-Fe2O3微粉饱和磁化强度的影响

我们制备了直径为80—700A的γ-Fe₂O₃微粉,测量了它的比饱和磁化强度σ_s和比表面积S_a,得出经验公式:σ_s(s=σ_s(∞)(1—aS_a)。假定微粉由两部分组成:第一部分是表面层,在磁场的作用下,它的磁矩只能转到与磁场成某个角度;第二部分是内部,它的磁矩可以转到磁场的方向。从这个简单的模型出发,上述的经验公式可以得到较好的解释。 关键词：     

Eu3+激活的硼钒酸钇的光致发光

找出了合成Eu3+激活的硼钒酸钇铕发光粉的适宜条件和发光最佳化学组分,它是(Y0.94Eu0.06)(V0.69B0.31)O3.7.对其发光光谱的温度依赖关系的研究指出,发光最佳温度在350℃左右.发光的这种温度依赖关系与基质和Eu3+对能量的吸收,以及基质向Eu3+能量传递效率的提高有关.此外,试验结果还表明,在365nm激发下,少显Gd2O3、Zn2GeO4·GeO2:Mn2+等添加剂的加入提高了样品的发光亮度.