场地土对基岩峰值加速度放大效应分析

通过实际土层地震反应结果的统计分析和强震加速度观测结果的对比, 讨论了不同场地条件对基岩峰值加速度的放大效应及其特点。该分析可为地震动参数区划图编制和地震安全性评价中场地效应的估计、由基岩地震动估算场地地面地震动提供参考。     

场地土的随机地震反应分析

研究了剪切模量随深度呈线性变化时场地土的随机地震反应分析方法, 分别建立了基岩输入地震动加速度功率谱函数为白噪声和过滤白噪声时场地土的随机地震反应分析理论。     

The Minimal Occupancy Level of the Clathrate Hydrate Host Lattice and the Intercalation Heat of the Guest Molecules in the Chlorine Hydrates

The minimal occupancy level (θ_min) of the clathrate lattice of gas molecules is defined as the number of guest molecules in the host clathrate lattice, which can stabilize the thermodynamically unstable empty cage by covering the energy demand of the transformation of hexagonal ice into empty clathrate lattice (ΔH_trans). The θ_min values for chlorine hydrate were determined from the n = f(p)_T=const. relationship and the average molar intercalation heat of chlorine in the type I clathrate lattice was also calculated for both type of cavities.     

Thermodynamic and structural study of pyrene-1-carboxaldehyde/DNA interactions by molecular spectroscopy: Probing intercalation and binding properties

The binding of pyrene-1-carboxaldehyde (1-PyCHO) with ctDNA was investigated through absorption, intrinsic and induced circular dichroism, viscosity measurements and steady-state fluorescence. The binding and the number of monomer units of the polymer involved in the binding of one dye molecule (site size) have been quantified. The results indicated that the 1-PyCHO molecule binds to the ctDNA in an intercalative mode. The spectroscopic evidence of this intercalation process is also corroborated by the effect of urea, iodide-induced fluorescence quenching of pyrene-1-carboxaldehyde and competitive binding using a fluorescent intercalator, SYBR Green I (SG). The induced circular dichroism (ICD) spectra of pyrene-1-carboxaldehyde complexed with ctDNA show that pyrene-1-carboxaldehyde intercalates into ctDNA and that the intercalation orientation of pyrene to the DNA base-pairs long axis is heterogeneous. On the other hand, the intrinsic circular dichroism (CD) spectra show a stabilization of the right-handed B form of ctDNA, due to the intercalation process.     

Synthesis and characterization of new magnetically recoverable molybdenum nanocatalyst for epoxidation of olefins

New heterogeneous molybdenum catalyst was prepared through covalent attachment of a Schiff base ligand on the surface of silica coated magnetite nanoparticles via aminopropyl spacer and subsequent complexation with MoO₂(acac)₂. The prepared nanocatalyst was characterized with Fourier transform infrared spectroscopy, X-ray diffraction, scanning and transmission electron microscopies and vibrating sample magnetometry. Catalytic epoxidation of some olefins and allylic alcohols by prepared nanocatalyst using tert-butyl hydroperoxide and cumene hydroperoxide as oxidants was achieved with good activities and selectivities.     

Modelling of the Potentiometric Response of ENFETs Based on Enzymatic Multilayer Membranes

Based on the modified site‐binding model, the response of urea‐sensitive enzymatic field effect transistors (ENFETs) is fitted. The effect of two types of surface sites (silanol and amine sites) and of additional polymeric permselective membrane on the sensitivity of the biosensor is discussed. It is found that the dependence of the slope of the sensor response versus pUrea, on the buffer concentration and on the diffusion of the urea in the enzymatic membrane can be translated by a parameter α that depends on the membrane composition. Moreover, the enhancement of the sensor sensitivity by deposition of additional permselective membranes can be illustrated by a parameter δ that depends on the association of additional permselective membranes and a buffer; the higher values of parameter δ are obtained with a Nafion membrane associated with a phosphate buffer.     

Kerr效应对T-C模型中原子布居数的影响

应用全量子理论，研究了Kerr介质中双模压缩真空场与耦合二能级原于相互作用系统原子布居差的时间演化规律，讨论了初始压缩因子、介质与辐射场的耦合强度对原子布居时间演化的影响。结果表明，随着Kerr效应的加强，原于布居的崩塌一回复周期变短，以至消失，振荡幅度减小。     

Skyrme-Hartree-Fock approach to the change of level occupancy of low mass halo nuclei

With a new parameterization of potential parameters which reproduces the ground state properties of shell closed nuclei fairly accurately, the role of occupancy of 2s _1/2 level in determining the halo structures of ¹⁷O, ¹⁶N, ¹⁵C, ¹⁴B, ¹³Be have been investigated. The results show interesting cross over of level occupancies which may explain the increase in interaction radii.