光学元件激光预处理技术

国外学者用1064 nm激光对pickoff镜进行预处理,发现损伤阈值平均提高38.8%。国内研究者用CO2激光中度抛光后,熔石英基片的损伤阈值提到了30%左右,激光波长、扫描方式等对处理效果影响也比较明显。介绍了三种公认的预处理机制,将离线与在线处理方式做了简单地比较,并对国内外激光预处理技术的发展和前景进行了展望。     

偏振态的高速实时测量方法的研究

偏振态的测量在光通信领域有着重要的作用,因此越来越受到人们的关注。在分析现有方案的基础上,推导出了新的斯托克斯计算公式,以此公式为依据提出了一种能对高速变化的偏振态进行实时测量的新方案,并对可能产生的误差因素进行了分析。给出了制作实用化测量模块所要达到的器件要求和制作工艺。     

紫外分光光度法测定路边青中多酚含量

用紫外分光光度法测定了路边青中多酚含量,并对实验结果进行了方法学考查。实验测得路边青中多酚含量为1.7293%,平均加标回收率为99.4%,加标回收的RSD为1.7%。精密度、重复性和稳定性分析的相对标准偏差分别为0.29%、0.41%和0.35%。     

奥扎格雷对蘑菇酪氨酸酶的抑制动力学

抗血小板凝聚药奥扎格雷不仅抑制酪氨酸酶单酚酶活性,而且对二酚酶具有很强抑制。导致单酚酶活力和二酚酶活力下降50%的奥扎格雷浓度(IC50)分别为1.35mmol/L和3.45mmol/L。奥扎格雷对单酚酶的抑制效应主要表现于酶催化反应的延滞时间有明显的延长。奥扎格雷对二酚酶的抑制作用表现为可逆的竞争性和非竞争性混合型抑制。     

不良导体导热系数的测量与探讨

根据利用物体散热速率求传热速率的实验思想,给出了橡胶盘导热系数的实验结果。并对散热速率做了分析,给出了一个修正方案。     

Advances in methods and algorithms in a modern quantum chemistry program package

Advances in theory and algorithms for electronic structure calculations must be incorporated into program packages to enable them to become routinely used by the broader chemical community. This work reviews advances made over the past five years or so that constitute the major improvements contained in a new release of the Q-Chem quantum chemistry package, together with illustrative timings and applications. Specific developments discussed include fast methods for density functional theory calculations, linear scaling evaluation of energies, NMR chemical shifts and electric properties, fast auxiliary basis function methods for correlated energies and gradients, equation-of-motion coupled cluster methods for ground and excited states, geminal wavefunctions, embedding methods and techniques for exploring potential energy surfaces.     

Infrared spectra and intensities of the H2O and N2 complexes in the range of the nu1- and nu3-bands of water

The IR spectra of complexes of water with nitrogen molecules in the range of the symmetric (nu(1)) and antisymmetric (nu(3)) bands of H(2)O have been studied in helium droplets. The infrared intensities of the nu(3) and nu(1) modes of H(2)O were found to be larger by factors of 1.3 and 2, respectively, in the N(2)-H(2)O complexes. These factors are smaller than those obtained in recent theoretical calculations. The conformation of the N(2)-H(2)O complex was estimated. Spectra and IR intensities of the (N(2))(2)-H(2)O and N(2)-(H(2)O)(2) complexes were also obtained and their structures are discussed.     

Multi-mode Spiral Wave in a Coupled Oscillatory Medium

Multi-mode spiral wave and its breakup in 1-d and 2-d coupled oscillatory media is studied here by theoretic analysis and numerical simulations. The analysis in 1-d system shows that the dispersion relation curve could be nonmonotonic depending on the coupling strength. It may also lead to the coexistence of different wave numbers within one system. Direct numerical observations in 1-d and 2-d systems conform to the prediction of dispersion relation analysis. Our findings indicate that the wave grouping can also be observed in oscillatory media without tip meandering and waves with negative group velocity can occur without inhomogeneity.     

On the Hybrid Power Mean Involving the Two-Term Exponential Sums and Polynomial Character Sums

The main purpose of this paper is using the analytic method and the properties of trigonometric sums and character sums to study the computational problem of one kind hybrid power mean involving two-term exponential sums and polynomial character sums. Then the authors give some interesting calculating formulae for them.     

Stochastic Maximum Principle for Forward-Backward Regime Switching Jump Diffusion Systems and Applications to Finance

The authors prove a sufficient stochastic maximum principle for the optimal control of a forward-backward Markov regime switching jump diffusion system and show its connection to dynamic programming principle. The result is applied to a cash flow valuation problem with terminal wealth constraint in a financial market. An explicit optimal strategy is obtained in this example.