探讨妊娠糖尿病运用个体化营养膳食的影响

目的了解妊娠期糖尿病专业治疗中行个体化营养膳食疗法对其妊娠结局以及血糖控制水平产生的影响。方法选择130例因妊娠期糖尿病进入江西省萍乡市人民医院的患者,以膳食疗法的差异分组:62例Ⅰ组施以常规膳食疗法,68例Ⅱ组则施以个体化营养膳食疗法,再对两组病例血糖值及其妊娠结局专业统计、观察。结果施以两种膳食疗法后,62例Ⅰ组FPG值(5.60±0.90)mmol/L,68例Ⅱ组(4.47±0.49)mmol/L,(P<0.05);同时Ⅱ组2h PG值及其妊娠结局等都优于Ⅰ组,(P<0.05)。结论对于患有糖尿病的妊娠期患者,通过施以个体化营养膳食疗法,可实现对妊娠结局的充分改善,值得推荐应用。     

Error Estimation for Eigenvalues of Unbounded Linear Operators and an Application to Energy Levels in Graphene Quantum Dots

The eigenvalue problem for linear differential operators is important since eigenvalues correspond to the possible energy levels of a physical system. It is also important to have good estimates of the error in the computed eigenvalues. In this work, we use spline interpolation to construct approximate eigenfunctions of a linear operator using the corresponding eigenvectors of a discretized approximation of the operator. We show that an error estimate for the approximate eigenvalues can be obtained by evaluating the residual for an approximate eigenpair. The interpolation scheme is selected in such a way that the residual can be evaluated analytically. To demonstrate that the method gives useful error bounds, we apply it to a problem originating from the study of graphene quantum dots where the goal was to investigate the change in the spectrum from incorporating electron–electron interactions in the potential.     

有界原子模型的原子结构计算

本文根据有界原子模型,通过对Dirac方程的求解,计算了H、Fe在不同物质密度、不同边界条件下的原子结构。结果发现:当物质密度较小时,近似于自由原子时的情况;当物质密度较大时,原子的外壳层电子能级有较大的变化。并且根据H在不同物质密度、不同边界条件下的原子结构的分析,展现了H的能带图象。     

分析指认固体中稀土离子4f-5d跃迁光谱的简单模型

概要介绍和总结最近由段昌奎等人提出,并经发展扩充的用以分析指认固体中稀土离子f-d跃迁光谱的简单模型,以及对Nd³⁺、Sm³⁺、Eu³⁺、Eu²⁺、Tb³⁺、Ho³⁺、Er³⁺的f-d激发光谱及Nd³⁺的d-f辐射谱的成功应用。也论及值得进一步研究的其他离子的f-d谱。     

Thermally Stimulated Current Observation of Trapping Centers in Undoped GaSe Layered Single Crystals

Undoped p‐GaSe layered single crystals were grown using Bridgman technique. Thermally stimulated current measurements in the temperature range of 10‐300 K were performed at a heating rate of 0.18 K/s. The analysis of the data revealed three trap levels at 0.02 , 0.10 and 0.26 eV. The calculation for these traps yielded 8.8 × 10^‐27, 1.9 × 10^‐25, and 3.2 × 10^‐21 cm² for capture cross sections and 3.2 × 10¹⁴, 1.1 × 10¹⁶, and 1.2 × 10¹⁶ cm^‐3 for the concentrations, respectively.     

Enhanced damping of a cantilever beam by axial parametric excitation

A uniform cantilever beam under the effect of a time-periodic axial force is investigated. The beam structure is discretized by a finite-element approach. The linearised equations of motion describing the planar bending vibrations of the beam structure lead to a system with time-periodic stiffness coefficients. The stability of the system is investigated by a numerical method based on Floquet’s theorem and an analytical approach resulting from a first-order perturbation. It is demonstrated that the parametrically excited beam structure exhibits enhanced damping properties, when excited near a specific parametric combination resonance frequency. A certain level of the forcing amplitude has to be exceeded to achieve the damping effect. Upon exceeding this value, the additional artificial damping provided to the beam is significant and works best for suppression of vibrations of the first vibrational mode of the cantilever beam.     

稀土氟碳酸盐矿物的拉曼光谱研究

研究了氟碳钡铈矿Ｃｅ２Ｂａ［ＣＯ３］３Ｆ２、氟碳钙铈矿Ｃｅ２Ｃａ［ＣＯ３］３Ｆ２和氟碳铈矿Ｃｅ［ＣＯ３］２Ｆ等矿物的拉曼光谱特征。结果表明,钡稀土氟碳酸盐矿物（氟碳钡铈矿、氟碳铈钡矿、黄河矿）的Ｒａｍａｎ光谱特点是,ν１和ν２为单峰值,ν３和ν４为双峰值。钙稀土氟碳酸盐矿物（氟碳钙铈矿）的拉曼光谱带中ν１和ν４为双峰值,ν２和ν３为单峰值。稀土氟碳酸盐矿物（氟碳铈矿）的Ｒａｍａｎ光谱的特点是,ν１、ν２和ν４为单峰值,ν３为双峰值。