刻蚀波导粗糙面散射的矩量法数值分析

用矩量法对刻蚀波导粗糙面的散射特性做出了精确的数值分析基于MonteCarlo方法建立高斯粗糙面数学模型,证明矩量法在分析刻蚀波导散射问题时,是可以应用于不同起伏高度、不同入射角的一种精确而高效的数值方法对不同起伏高度的两种偏振态,分别在小角度入射和大角度入射两种情况的随机散射特性应用矩量法做出了分析并以基于二氧化硅波导的EDG器件为例,分析了由于波导壁粗糙对于器件频谱响应特性的影响.     

用于改善蒸汽驱效果的高温抗盐泡沫剂研究进展

以往的研究理论和矿场实验已经证明,蒸汽泡沫驱是一种有效防止汽窜、提高稠油采收率的方式。本文分析了蒸汽泡沫驱目前所存在的问题,提出了解决办法;回顾了耐温耐盐发泡剂的研究历程,给出了发泡剂的一些合成方法,总结了前人制备高温耐盐发泡剂、复配泡沫体系的研究成果,指出了现有发泡剂的不足;探讨了泡沫产生、流动和稳定机理,从微观方面进一步探寻稳定泡沫的原理;初步介绍了纳米颗粒提高泡沫稳定性的原因,结合泡沫产生和流动的微观机理,分析了纳米颗粒提高蒸汽泡沫驱油效率的实质。最后,展望了蒸汽泡沫驱未来的发展方向。     

中国股评家预测行为的实证研究

本文以 2 0 0 0年在《中国证券报》上发表的股评家的预测文章为样本 ,建立了 3组回归方程来研究股评家对于大盘预测的准确性及影响预测的影响因素。研究结果发现 ,股评家的短期预测平均而言是一个未来大盘收益率的一个反向指标。宠观的经济面信息、前一天的公众舆论和前 3天的大盘平均收益率都对于股评家的预测有显著影响 ,其中以公众舆论的影响作用最大。在这些因素中 ,宏观的经济面信息有助于提高股评家预测的准确性 ,而其他因素则降低了股评家预测的准确性。     

熔拉和腐蚀单模阶跃光纤的模场分析

考虑到包层厚度和包层外介质的影响 ,在单模光纤的高斯近似理论基础上 ,导出了单模阶跃光纤模场半径方程 ,并就光纤在传感等领域应用中常见的熔拉和腐蚀处理两种情况 ,进行了相应的数值计算 ,给出了近似解析解。引入特性转换点 ,对模场特性作了分析。     

向量集值优化问题的最优性条件

提出了集值映射的三种切上导数的概念,利用这些概念,给出了向量集值优化问题的弱有效解,强有效解和各种有效解的充分必要条件.     

Different production sources of light nuclei in ultra-relativistic heavy-ion collisions

We systematically study different production sources of light nuclei in ultra-relativistic heavy-ion collisions with a new method, an exclusive quark combination model + an inclusive hadron recombination model. We take deuterons and ~3 He produced in Pb-Pb collisions at ■= 2.76 TeV as examples to show the contribution of different production sources by studying their rapidity densities dN/dy, yield ratios and transverse momentum(PT)spectra just after hadronization and at the final kinetic freeze-out. We find that about a half of d and a fourth of ~3 He created just after hadronization can survive after the hadronic evolution process. Nucleons from A resonance decays make a much larger contribution to the regeneration of light nuclei at the hadronic phase stage, and this contribution is about 77% and 90% for d and ~3 He, respectively, calculated at the final kinetic freeze-out. In addition, we give an explanation for the constant behaviors of yield ratios d/p and ~3 He/p as a function of the averaged charged multiplicity in Pb-Pb collisions and also provide a possible explanation for the observation that d/p in Pb-Pb collisions is larger by a factor of about two than in pp collisions at LHC energies.     

Statistical method in quark combination model

We present a new method for solving the probability distribution for baryons,antibaryons,and mesons at the hadronization of the constituent quark and antiquark system.The hadronization is governed by the quark combination rule in the quark combination model developed by the Shandong Group.We employ the method of the generating function to derive the outcome of the quark combination rule,which is significantly simpler and easier to generalize than the original method.Furthermore,we use the formula of the quark combination rule and its generalization to study the property of the multiplicity distribution of net-protons.Taking a naive case of quark number fluctuations and correlations at hadronization,we calculate ratios of multiplicity cumulants of final-state net-protons and discuss the potential applicability of the quark combination model by studying hadronic multiplicity fluctuations and the underlying phase transition property in relativistic heavy-ion collisions.     

Multiplicity fluctuation and correlation of mesons and baryons in ultra-relativistic heavy-ion collisions at the LHC

We study the multiplicity fluctuation and correlation of identified mesons and baryons formed at hadronization by the quark combination mechanism in the context of ultra-relativistic heavy-ion collisions. Based on the statistical method of free quark combination, we derive the two-hadron multiplicity correlations, including meson-meson and meson-baryon correlations, and take the effects of quark number fluctuation at hadronization into account by a Taylor expansion method. After including the decay contributions, we calculate the dynamical fluctuation observable ν_(dyn) for Kπ, pπ and Kp pairs and discuss what underlying physics can be obtained by comparing with data from Pb-Pb collisions at sNN~(1/2)=2.76 Te V and simulations from the HIJING and AMPT event generators.     

Wavelet-Transform Spectrum for Quantum Optical States

In the context of quantum mechanics we employ the technique of integration within an ordered product of operators to recast the classical wavelet transform to a squeezing-displacing transform between the mother wavelet vector and the state vector to be transformed. In this way we propose the wavelet-transform spectrum for quantum optical states. For some typical states we obtain numerical results which imply that the spectrum can be used to recognize a variety of quantum optical states, and the inverse wavelet transform has the possibility to play a role in quantum state engineering.     

巧设情境引导探究——探究课堂中的情境创设

1引言 科学探究过程通常在一定情境中进行,探究情境的创设对能否顺利、高效进行探究有重要作用;如果忽视情境创设,离开合理的情境,探究往往是低效的,学生可能会不明确探究方向．