Universal inequalities on complete noncompact smooth metric measure spaces

In this paper, we obtain universal inequalities for the eigenvalues of the Dirichlet problem and clamped plate problem of drifting Laplacian on (\(n+1\))-dimensional (\(n\ge 4\)) complete noncompact simply connected smooth metric measure spaces which meet some conditions of the sectional curvature and radial weighted Ricci curvature.     

Interaction of the La(III)–Morin Complex with Human Serum Albumin

Journal of Solution Chemistry - Lanthanum (La) is one of the most reactive rare earth elements, whose carbonate had been approved by the FDA for marketing as a treatment drug for hyperphosphatemia....     

Synthesis and Characterization of the cis-Dicyanoiron(Ⅱ) Building Block and Its Interactions with Selected Metal Ions

In this work, a cis-dicyanoiron(Ⅱ) building block, cis-Fe~(Ⅱ)(bpy)_2(CN)_2(1, bpy = 2,2?-bipyridine), has been prepared and fully characterized by IR, electronic absorption spectra, elemental analysis, cyclic voltammetry and single-crystal X-ray diffraction analysis. The interactions of complex 1 with selected metal ions, such as Cu(Ⅱ), Fe(Ⅲ), Pb(Ⅱ), Fe(Ⅱ), Cr(Ⅲ), Cd(Ⅱ), Co(Ⅱ), Zn(Ⅱ), Ni(Ⅱ) and Mn(Ⅱ), were investigated employing electronic absorption spectroscopy. The electronic absorption spectroscopy indicates Cu(Ⅱ), Fe(Ⅲ), Cr(Ⅲ), Cd(Ⅱ), Co(Ⅱ), Zn(Ⅱ) and Ni(Ⅱ) ions steadily coordinate with 1 via cyanide, respectively. Fluorescent emission intensity of 1 increased upon the addition of Zn(Ⅱ) ion, quenched by adding ions Cu(Ⅱ), Fe(Ⅲ) and Pb(Ⅱ), and it was almost unchanged when adding the Fe(Ⅱ), Cr(Ⅲ), Cd(Ⅱ), Co(Ⅱ), Ni(Ⅱ) and Mn(Ⅱ) ions.     

Chaotic behavior of a stack of intrinsic Josephson junctions at the transition to branching for overcritical currents

Phase dynamics of a stack of coupled intrinsic Josephson junctions was investigated in the framework of capacitively coupled Josephson junctions with diffusion current model. We study the transition from the current-voltage characteristic specific to Josephson junctions arrays with small dissipation and weak coupling between the junctions to the arrays with strong coupling between the junctions and high dissipation. Low dissipative arrays of Josephson junctions are characterized by the absence of branching for overcritical currents which appears for highly dissipative arrays. Described branching appears due to charging on the superconducting layers and charge traveling waves generation. Arrays of Josephson junctions with intermediate values of coupling and dissipation parameters are characterized by the chaotic behavior, confirmed by positive Lyapunov exponent, and branching on the current voltage characteristic for both sub- and overcritical currents.     

单镜面附近激发态极化原子的自发辐射简

利用格林函数和费米黄金定律,我们计算了单镜面附近的激发态极化原子的自发辐射率.结果表明:原子的自发辐射与原子的极化偶极距取向有关,并且随着原子与镜面间距的增大,辐射率呈现正弦形式的振荡.当偶极距取向与镜面方向平行时,自发辐射的正弦式振荡最为激烈.但是随着极化方向与镜面方向夹角的增大,自发辐射的振荡越来越弱.当偶极距取向与镜面垂直时,振荡几乎消失.利用光子的闭合轨道理论,我们可以发现激发态原子偶极距取向影响辐射光子数的多少,从而可以改变原子的自发辐射率.     

EXFAS electron spectroscopy as a new tool of local characterisation of copper in Cu-Beta zeolite

EXFAS spectroscopy has been applied for the first time to the study of the local characterisation of reduced copper in zeolites. The oscillating features observed beyond the Cu M_2,3VV Auger transition have been isolated and analysed following the standard EXAFS procedure.     

Study on the Synergism Effect of Lomefloxacin and Ofloxacin for Bovine Serum Albumin in Solution by Spectroscopic Techniques

Both lomefloxacin (LOM) and ofloxacin (OFL) have a powerful ability to quench the fluorescence of bovine serum albumin (BSA). The fluorescence quenching action is much stronger when the two drugs coexist. The synergism between LOM and OFL was studied using fluorescence and ultraviolet spectroscopy under imitated physiological conditions. The results show that static quenching and non-radiation energy transfer are the main reasons for the fluorescence quenching. The synergism results in both the reduction of the binding stability between drugs and BSA and an increase of the free drug concentration, which will increase the efficacy of drugs. The thermodynamic parameters at different temperatures were calculated and the binding distances r between the drugs and BSA were obtained based on Försters theory of non-radiation energy transfer. The synchronous fluorescence spectra indicated that the effect of synergism affected the conformation of BSA.     

Electron localization of H_2~+ in a dc electric field

A dc electric field is utilized to steer the electron motion after the molecular ion H_2~+ is excited by an ultrashort ultraviolet laser pulse. The numerical simulation shows that the electron localization distribution and the dissociation control ratio are dependent on the polarization direction and amplitude of the dc electric field. Most electrons of the dissociation state move opposite to the dc electric field and stabilize at the dressed-up potential well, for the dressed-down well is occupied by the electrons of the 1 sσ_g state.     

Synthesis,crystal structures,and catalytic property of dioxomolybdenum(VI) complexes with hydrazones

Two new dioxomolybdenum(VI) complexes, [MoO₂(L₁)] _n · 0.5 _n CH₃OH (I) and [MoO₂(L₂)(CH₃OH)] (II), where L1 and L₂ are the dianionic form of N′-[1-(4-diethylamino-2-hydroxyphenyl)methylidene]isonicotinohydrazide and N′-(2-hydroxy-4-methoxybenzylidene)-3-methylbenzohydrazide, respectively, were prepared and structurally characterized by physicochemical and spectroscopic methods and single-crystal X-ray determination. For complex I, a polymeric structure is obtained, which is linked by coordination of the pyridine N atoms to the Mo atoms of other [MoO₂(L₁)] units. Complex II is a mononuclear molybdenum compound. In both complexes, the Mo atoms are in octahedral coordination. The catalytic properties of the complexes indicate that they are efficient catalysts for sulfoxidation.