Calculation of α decay half-lives for superheavy elements using the double folding model＊

α decay half-lives of some new synthesized superheavy elements, possibly synthesized superheavy elements and decay products are calculated theoretically within the WKB approximation by using microscopic α-nucleus interaction potentials. These nuclear potentials between the α particle and daughter nuclei are obtained by using the double folding integral of the matter density distribution of the α particle and daughter nuclei with a density-dependent effective nucleon-nucleon interaction, in which the zero-range exchange term is supplemented. The calculated α decay half-lives are compared with those of the different models and experimental data. It is shown that the present calculation successfully provides the half-lives of the observed decays for some new superheavy elements and therefore gives reliable predictions for α decay of possibly synthesized superheavy elements in future experiments.     

Synthesis, Characterization, Crystal Structure and Stability of a Ternary Cu(Ⅱ) complex with 1,10-Phenanthroline and L-Valinate

Introduction It is important to research the mixed-ligand copper complexes containing bioligands,such as amino acids, nucleic acids and proteins,in exploring the functional mechanism of microelement copper in organism because the reaction of any micronutrient with two or more bioligands in the concentrated bioligands background gives mixed-ligand ternary complexes, which are more stable[1]and related with storage of substance and transportation of metal ions in the life process.     

GC-MS分析氧化亚铁硫杆菌培养液的挥发性成分

GC- MS联用技术对耐强辐射微生物氧化亚铁硫杆菌 [Thiobacillus ferroxidans(T.f) ]的挥发性代谢产物进行了研究 ,发现 4 3种代谢物 ,由标准谱图鉴定了其中 2 3种化合物。     

Lattice Boltzmann模型在CFD中应用

近年来,格子Boltzmann方法(LBM)已发展为一种模拟流体和物理问题的新颖的、有前景的数值方法,在许多领域的各种数值问题求解上取得很大的成功.文章介绍了一种模拟复杂流动的高效建模数值算法Lattice Boltzmann方法,和它的基本原理及其应用.并通过两个实例数值模拟计算,说明Lattice Boltzmann方法正确、有效,并展示了广阔的应用前景,为今后更深入的研究和广泛应用打下基础.     

On the Diophantine Equation x2 - kxy ＋ y2 ＋ 1x = 0

Let l be a given nonzero integer.The authors give an explicit characterization of the positive integer k that makes the Diophantine equation x2-kxy+y2+lx=0 have infinitely many positive integer solutions(x,y).     

FTIR光谱仪中基于定镜调整的动镜运动控制研究

动镜是FTIR光谱仪中唯一不断运动的部件,动镜的匀速运动性能以及动镜与定镜的准直性好坏影响干涉效果和光谱图质量,直接制约着仪器的精度和分辨率,对仪器整体指标起着重要作用。文章围绕FTIR光谱仪中干涉仪动镜运动的匀速性以及其与定镜的准直性展开研究,使用相位检测技术对定镜的姿态作出动态调整以补偿动镜与定镜间的倾斜夹角,并且设计了具有磁悬浮特点的动镜支撑系统。文章采用改进的模糊PID控制算法实现动镜运动速度的精确调节,对该控制方案从硬件设计和算法上实现。结果表明所研发的动镜运动控制系统具有足够的精度和实时性,能够保证FTIR光谱仪中干涉仪所需的准直性及动镜匀速性的要求。     

低曝光条件下遥感相机微振动量检测

针对搭载平台颤振对遥感相机成像的影响,利用辅助高速面阵CCD相机拍摄高帧频图像序列,通过像元合并来补偿曝光时间不足,增加图像的亮度、对比度和信噪比,同时结合一种区域选择算法来选择用于计算的图像区域,最后使用灰度投影算法对振动位移量进行估计.实验数据表明,提出的改进算法误差为一个像元,在准确性和稳定性方面均明显优于原始算法.     

γ-Al2O3负载Cr促进SO2-4/ZrO2固体超强酸研究

将Ｃｒ促进的ＳＯ＾２－４／ＺｒＯ２（ＳＺ）固体超强酸Ｃｒ－ＳＺ负载于γ－Ａｌ２Ｏ３载体上,制成Ｃｒ－ＳＺ／Ａｌ２Ｏ３系列固体超强酸,利用探针反应考察了其超强酸性,中强酸性和弱酸性的变化情况,详细研究了样品的比表面、硫含量、ＺｒＯ２晶化情况及正丁烷低温异构化反应活性,结果发现,负载后部分Ｃｒ－ＳＺ的正丁烷低温异构化反应活性显著提高,含铬样品酸强度和脱氢性能的增强对其正丁烷异构化反应活性的提高均有贡献,样品酸性和脱氢性之间的合适匹配使Ｃｒ－ＳＺ／Ａｌ２Ｏ３显示出很高的正丁烷异构化反应活性。     

Quantum Effects of a Dissipative Mesoscopic Circuit with Mutual Inductance

We study the quantum fluctuations of the charge and current of two L-C dissipative mesoscopic circuit with the mutual inductance in the vacuum state.Our results show that the system state will evolve to a squeezed coherent state under the effect of external source.We find that the squeezing amplitude parameter is relative to the parameters of circuit and the mutual-inductance coefficient in the existence of dissipation.When the circuit has no dissipation or there is complete coupling between two meshes,the squeezing amplitude parameter only depends on the capacitance‘s ratio.     

关于广义Ramanujan-Nagell方程的一点注记

本文研究了广义Ramanujan-Nagell方程的正整数解,利用初等方法,得到了它的所有偶数解,从而部分地解决了该方程的求解问题.