The Investigation of K Shell X-Ray Fluorescence Parameters for Sulphur Atom in Different 1 ,2,4-Triazoles

The measurement of K shell fluorescence parameters is an easy and practical way to investigate the electronic structures of elements in alloys,compounds or complexes.Since the number of valence electrons will change the screening effect,the measured parameters will be affected from the changes.In this study,the measured parameters were investigated for sulphur element according to the number of CH_2 groups.For the experimental measurements,the samples were excited by 59.5keVγrays from a 241 Am annular radioactive source.The emitted K X-rays from the samples were counted by ab Ultra-LEGe detector with a resolution of 150 eV at 5.9keV.     

基于迭代拟合的集装箱角件边缘检测算法

噪声通常是影响集装箱角件图像中低层次语义信息提取精度的重要因素,传统的边缘检测算法通常通过改进滤波器和阈值来消除图像中的物理噪声和环境噪声,但是却无法去除边缘检测后的噪声,为解决这一问题,提出了一种基于迭代拟合的边缘检测算法。首先,对角件图像进行一系列预处理操作获取边缘点集,其次,使用拟合算法处理点集并且得到函数表达式,然后定义偏差值度量并计算,用于衡量目标点集到拟合或者检测结果的偏差,最后,去除定义下距离拟合结果最远的指定数量的点,如此迭代拟合直至评价函数收敛。实验结果与分析表明,该算法可以有效地去除边缘点集中的非真实边缘点,相比于传统的边缘检测算法更能去除特殊噪声,算法具有收敛速度快、准确率较高、灵活性好等特点。     

Ag60纳米颗粒[{Cl@Ag12}@Ag48(dppm)12]的结构(其中dppm=双(二苯基膦基)甲烷

本文合成一种新的双膦连接Ag₆₀纳米团簇[{Cl@Ag₁₂}@Ag₄₈(dppm)₁₂],并通过X射线晶体学进行表征. 二十面体的银处于核心位置,里面是中心氯化物组成,外面有48 个银原子/离子的包裹,顶端是12个双(二苯基膦基)甲烷(dppm)配体. 同时利用密度泛函理论对阳离子[{Cl@Ag₁₂}@Ag₄₈(dppm)₁₂]⁺进行计算,以确定该结构是否对应于核心数n=58的超原子. DFT计算的优化结构与X射线一致,但是HOMO-LUMO的能差并不能保证其超级稳定性.     

Simultaneous 2D in-plane deformation measurement using electronic speckle pattern interferometry with double phase modulations

Electronic speckle pattern interferometry(ESPI) and digital speckle pattern interferometry are wellestablished non-contact measurement methods. They have been widely used to carry out precise deformation mapping. However, the simultaneous two-dimensional(2D) or three-dimensional(3D) deformation measurements using ESPI with phase shifting usually involve complicated and slow equipment. In this Letter, we solve these issues by proposing a modified ESPI system based on double phase modulations with only one laser and one camera. In-plane normal and shear strains are obtained with good quality. This system can also be developed to measure 3D deformation, and it has the potential to carry out faster measurements with a highspeed camera.     

Structure,stability, catalytic activity,and polarizabilities of small iridium clusters

At the second order Douglas–Kroll–Hess(DKH2) level, the B3 PW91 functional in conjunction with the relativistic all-electron basis set of valence triple zeta quality plus polarization functions are employed to compute bond lengths, dissociation energies, vertical ionization potentials, and the highest occupied molecular orbital-lowest unoccupied molecular orbital energy gaps of the small iridium clusters(Ir_n, n≤8). These results are compared with the experimental and theoretical data available in the literature. Our results confirm the theoretical predictions made by Feng et al. about the catalytic activities of the Ir_4 and Ir_6 clusters. From the optimized geometries, DKH2 calculations of static electric mean dipole polarizabilities and polarizability anisotropies are also carried out. It is the first time that the polarizabilities of small iridium clusters have been studied. For n≤4, the mean dipole polarizabilities per atom present an odd–even oscillatory behavior,whereas from Ir_5 to Ir_8, they decrease with the cluster size increasing. The dependence of the polarizability anisotropy on the structure symmetry of the iridium cluster is verified.     

Exact transverse solitary and periodic wave solutions in a coupled nonlinear inductor-capacitor network

Through two methods, we investigate the solitary and periodic wave solutions of the differential equation describing a nonlinear coupled two-dimensional discrete electrical lattice. The fixed points of our model equation are examined and the bifurcations of phase portraits of this equation for various values of the front wave velocity are presented. Using the sineGordon expansion method and classic integration, we obtain exact transverse solutions including breathers, bright solitons,and periodic solutions.     

Exploring the shadow of a rotating charged ModMax black hole

The research presented in this paper discusses the impact that the parameters of charge(Q) and screening factor(γ) have on properties of the horizon and silhouette of rotating charged Mod Max black holes which were reviewed in [Eur. Phys. J. C(2022) 82:1155] recently, building upon previous findings in the field. Furthermore, the study explores the behavior of null geodesics, which can help us better understand the apparent shape of the black hole’s silhouette,as well as the distortion parameter...     

Magnetic and quadrupole moments of the Zc(4020)+,Zc(4050)+,and Zc(4600)+ states in the diquark-antidiquark picture

The magnetic and quadrupole moments of the Z_c(4020)⁺,Z_c(4050)⁺,and Z_c(4600)⁺ states are calculated within the QCD light-cone sum rules.The compact diquark-antidiquark interpolating currents and the distribution amplitudes of the on-shell photon are used to extract the magnetic and quadrupole moments of these states.The magnetic moments are acquired as μ_Zc=0.50_-0.22^+0.22μ_N,μ     

Square-root parametrization of dark energy in f(Q) cosmology

This paper is a parametrization of the equation of state(Eo S) parameter of dark energy(DE),which is parameterized using square-root(SR) form i.e.wSR=w0 +w1 (z/(z²+1))(1/2), where ω0and ω1 are free constants. This parametrization is examined in the context of the recently suggested f(Q)gravity theory as an alternative to general relativity(GR), in which gravitational effects are attributed to the non-metricity scalar Q with the functional form f(Q) = Q + αQn, where α and n are arbitra...     

Reversed charge transfer induced by nickel in Fe-Ni/Mo2C@nitrogen-doped carbon nanobox for promoted reversible oxygen electrocatalysis

The interaction between metal and support is critical in oxygen catalysis as it governs the charge transfer between these two entities, influences the electronic structures of the supported metal, affects the adsorption energies of reaction intermediates, and ultimately impacts the catalytic performance. In this study, we discovered a unique charge transfer reversal phenomenon in a metal/carbon nanohybrid system. Specifically, electrons were transferred from the metal-based species to N-doped ca...