地应力对爆破过程中围岩振动能量分布的影响

对高地应力条件下隧洞爆破开挖过程中围岩振动信号进行小波包分析,得到了振动信号不同频带上的能量分布。实测资料分析结果表明,爆破开挖时,初始地应力动态卸载诱发的围岩振动的频率范围和爆破荷载诱发的围岩振动频率范围基本相同,但地应力卸载诱发的振动中,低频能量占较大的比例;开挖面上的卸载应力值的大小和卸载面的大小共同决定卸载效应的强弱,而这两个因素均与开挖面上的炮孔布置和起爆网络的连接有关。     

Easily attainable new approach to mass yield ferrocenyl Schiff base and different metal complexes of ferrocenyl Schiff base through convenient ultrasonication‐solvothermal method

A new alternative approach with crucial mass yield and high reaction rates is proposed for the synthesis of ferrocenyl Schiff bases using an ultrasonication‐solvothermal method. Equimolar condensation of ferrocenecarboxaldehyde and 2‐aminophenol interact with each other, giving 1‐(1‐[2‐hydroxyphenyl‐2‐imino]methyl)‐ferrocene (FcOH). Furthermore, this ligand forms 1:1 complexes with cobalt(II), nickel(II), copper(II), and palladium(II) ions. From the different spectral data, it is found that metal ions coordinate with ligands through the azomethine group and the deprotonated oxygen of the phenol groups. Moreover, FcOH and their complexes were characterized by elemental analysis, Fourier transform infrared, ¹H nuclear magnetic resonance, and UV‐visible spectrophotometry. The spectral data of FcOH and its metal complexes were discussed in connection with the structural changes due to complexation. Meanwhile, the information about geometric structures can be concluded from the electronic spectra and the magnetic moments. Plainly, electron spin resonance spectra of the Cu(II) complex revealed d_x2?y2 as a ground state, suggesting a square planar geometry around the Cu(II) center. The direct optical band gap energy E_g values of cobalt, nickel, copper, and palladium complexes of FcOH are found to be 3.7, 3.9, 4.6, and 3.65 eV, respectively. 1‐(1‐[2‐Hydroxyphenyl‐2‐imino]methyl)‐ferrocene and its metal complexes were screened for antibacterial activity. The results depict that the metal complexes were found to be more strongly antibacterial than the guardian Schiff base ligand (FcOH) against one or more bacterial species. The minimum inhibitory concentrations of antimicrobial properties of the purified compound were determined using the broth microdilution method.     

The effect of field modulation on the vibrational population of the photoassociated NaK and its dynamics

This paper presents calculation results for the photoassociation of a NaK molecule with a two-color modulated laser and gives a detailed analysis about them.For the two-step photoassociation process in intense fields,the effect of two-color modulated laser parameters,such as relative phase,envelope period,and laser intensity,on the population of the molecular electronic state can be obtained by solving the time-dependent Schrodinger equation through the quantum wave packet method.The numerical simulation shows not only that the influence of laser parameters on the vibrational distribution presents some regularity,but also that a higher population in the ground electronic state can be realized through adjusting these laser parameters.     

Energy absorption buildup factors of some potential bioactive compounds in the energy region 0.015–15 MeV

Kinetic energy released per unit mass relative to air and energy absorption buildup factors has been calculated for some potential bioactive compounds in the energy region of 0.015–15?MeV. The bioactive compounds of 1-aryl-3-dibenzylamino-propane-1-on hydrochloride type Mannich bases were used in this work. Aryl part was changed as C₆H₅ (1), 4-CH₃C₆H₄ (2), C₄H₃S-2-yl (3), 4-FC₆H₄ (4), 4-BrC₆H₄ (5), 4-ClC₆H₄ (6), and 4-NO₂C₆H₄ (7). The energy absorption buildup factors have been calculated for penetration depth of 40 mean free paths. It is observed that kinetic energy released per unit mass relative to air depends on the photon energy and chemical content of compounds. The compounds with least mean atomic number possess the maximum value of energy absorption buildup factors. Also, the energy absorption buildup factors are found the highest in intermediate energy, whereas the lowest in low as well as high energies.     

飞秒激光参数对四态阶跃型分子光电子能谱的影响

利用含时波包法研究三激光场中四态阶跃型K₂分子光电子能谱的Autler-Townes（AT）分裂.研究第二束激光场强和波长对AT分裂的影响.共振时,光电子谱为对称三分裂,非共振时,不对称三分裂逐渐变为双分裂.波长增加,谱峰以不等位移向低能方向移动.边峰间距不随波长的改变而改变,随场强增强而增大.研究结果为进一步从第一性原理的理论研究提供有用的信息,为实现分子的光控制及量子调控提供重要参考.     

Influence of laser fields on the vibrational population of molecules and its wave-packet dynamical investigation

The time-dependent wave packet method is used to investigate the influence of laser-fields on the vibrational population of molecules.For a two-state system in laser fields,the populations on different vibrational levels of the upper and lower electronic states are given by wavefunctions obtained by solving the Schro¨dinger equation with the splitoperator method.The calculation shows that the field parameters,such as intensity,wavelength,duration,and delay time etc.can have different influences on the vibrational population.By varying the laser parameters appropriately one can control the evolution of wave packet and so the vibrational population in each state,which will benefit the light manipulation of atomic and molecular processes.     

Triorganotin(IV) Derivatives of Bidentate Schiff Bases: Synthesis and Spectral Studies

Abstract

Reaction of tri-n-butyl tin(IV) chloride with the sodium salt of Schiff bases [salicylidene-2-aminopyridine (sapH), salicylidene-2-amino-4-picoline (sapicH), salicylidene-2-methyl-1-aminobenzene (o-smabH), salicylidene-4-methyl-1-aminobenzene (p-smabH), salicylidene-1- aminobenzene (sabH), salicylidene-3-nitro-1-aminobenzene (snabH)] in MeOH-C₆H₆ mixture in 1:1 molar ratio produced complexes of the type [Buⁿ ₃Sn(sb)] (where sb = Schiff bases). All complexes obtained were characterized by elemental analysis (C, H, N, and Sn), infrared (IR), nuclear magnetic resonance (NMR; ¹H, ¹³C, and ¹¹⁹Sn), and TOF-MS spectroscopic studies. These complexes were found to be monomeric, colored viscous liquids and are soluble in polar solvents (methanol, ethanol, DMSO, and DMF). On the basis of ¹¹⁹Sn NMR observations, a five coordination geometry around tin(IV) atom in these complexes is proposed tentatively.     

应用化学计量学技术研究同时定量分析重叠光谱

在八种化学计量学除噪技术比较研究的基础上,研制了小波包变换Elman回归神经网络方法(WPERNN)用于研究重叠光谱的同时定量测定。结合小波包变换和Elman回归神经网络改进除噪质量及回归能力。通过最佳化,选择了小波函数、小波包分解水平和Elman回归神经网络(ERNN)的结构及参数。两个程序PWPERNN和PERNN被设计执行WPERNN和ERNN方法计算。七种化学计量学方法用于比较研究。实验结果显示WPERNN方法是成功的且优于其他六种方法。     

一种新型多速率归零码全光帧时钟提取系统

提出了一种新型的、低成本的多速率归零(RZ)码全光帧时钟提取方案。采用低精细度的法布里-珀罗滤波器(F-P)直接提取不同速率的帧时钟,保证帧时钟的快速建立和快速消失。利用不同的偏振延时干涉仪(PDI)和低自由光谱区(FSR)的法布里-珀罗滤波器构成组合滤波器以实现多速率帧时钟提取。利用半导体光放大器(SOA)的自增益调制效应(SGM)对组合滤波器提取的帧时钟进行整形,降低帧时钟的幅度噪声和时间抖动。实验中,利用光开关切换不同的偏振延时干涉仪构成不同自由光谱区的组合滤波器实现了10 GHz、20 GHz和40 GHz的帧时钟提取,得到了高质量、低时间抖动的多速率帧时钟信号。     

Knotted Picture of Unknown Quantum State in Process of Quantum Teleportation

This paper gives the knotted picture of the unknown quantum state in the process of quantum teleportation and the surgical knotted operations of the unitary operators operated on the teleported quantum state.