AIRS红外高光谱卫星数据反演卷云光学厚度和云顶高度

基于大气红外探测器L1B红外高光谱辐射观测资料,结合中分辨率成像光谱仪(moderate resolution imaging spectroradiometer, MODIS)云产品数据,利用通用大气辐射传输模式(combined atmospheric radiative transfer model,CART),根据模式模拟和AIRS实际观测亮温的亮温差,研究从AIRS红外波段1 070～1 135 cm-1高光谱数据反演卷云的光学厚度和云顶高度。将反演的卷云光学厚度与云顶高度作为输入参数模拟计算650～1 150 cm-1波段卷云大气顶的辐射亮温谱,并将模拟值与AIRS观测亮温谱进行了对比分析。将反演的卷云光学厚度和云顶高度和AIRS的760通道(900.56 cm-1,11.1 μm)的亮温以及MODIS卷云反射率进行了对比分析。最后将反演的卷云云顶高度和MODIS云顶高度进行了对比分析。研究结果表明：反演所使用的650～1 150 cm-1波段模式模拟和观测亮温谱吻合得很好,说明CART可以较好的模拟AIRS亮温谱。反演的卷云参数与AIRS在大气窗口区的760通道(900.56 cm-1,11.1 μm)的亮温的分布满足低亮温对应较大的卷云光学厚度和高云顶高度。反演的卷云参数和MODIS卷云的反射率分布满足高卷云光学厚度和云顶高度对应高卷云反射率。反演的卷云云顶高度和MODIS的卷云云顶高度之间线性相关系数相对较高,且都在8.5～11.5 km的概率较高,两者的概率分布趋势一致。说明CART可以用于反演卷云的性质,反演结果具有一定的可靠性。     

Separation of Variables in Multi-Hamiltonian Systems: An Application to the Lagrange Top

Starting from the tri-Hamiltonian formulation of the Lagrange top in a six-dimensional phase space, we discuss the reduction of the vector field and of the Poisson tensors. We show explicitly that after the reduction to each symplectic leaf, the vector field of the Lagrange top is separable in the Hamilton–Jacobi sense.     

对称陀螺的旋进和章动的简化讨论

引入陀螺总角动量的旋进角速度,从运动学角度讨论高速自转陀螺的旋进和章和简便方法给出旋进角速度和章动角速度的定量关系式并讨论近似结果。     

ITO‐free top emitting organic light emitting diodes with enhanced light out‐coupling

Bottom emitting organic light emitting diodes (OLEDs) can suffer from lower external quantum efficiencies (EQE) due to inefficient out‐coupling of the generated light. Herein, it is demonstrated that the current efficiency and EQE of red, yellow, and blue fluorescent single layer polymer OLEDs is significantly enhanced when a MoO_x(5 nm)/Ag(10 nm)/MoO_x(40 nm) stack is used as the transparent anode in a top emitting OLED structure. A maximum current efficiency and EQE of 21.2 cd/A and 6.7%, respectively, was achieved for a yellow OLED, while a blue OLED achieved a maximum of 16.5 cd/A and 10.1%, respectively. The increase in light out‐coupling from the top‐emitting OLEDs led to increase in efficiency by a factor of up to 2.2 relative to the optimised bottom emitting devices, which is the best out‐coupling reported using solution processed polymers in a simple architecture and a significant step forward for their use in large area lighting and displays.     

高兴趣、宽知识、阔视野、强能力的 数学建模培训模式

本文讲述了厦门大学以全国大学生数学建模竞赛为驱动,通过十多年的探索,打造了一支勇于创新的数学建模教学团队,在教学方法、教学理念、教学模式上进行了富有成效的创新性改革。厦门大学精心打造《数学建模》精品课程体系、坚持将数学建模的思想融入数学的主干课程教学中,建立数学建模创新实验室,参与学科建设,坚持研教结合和高层次人才培养,取得了良好的效果,并以此辐射全国,具有很好的示范作用。     

审计意见、高管财务背景与内部控制缺陷修正

文章运用2010~2014年度沪深两市A股上市公司的相关数据,首先检验了审计意见与内部控制缺陷修正之间的相关性,结果表明上年收到“不清洁”审计意见的企业在当年更有可能进行内控缺陷的整改与修正;进一步通过分组回归发现,高管中具有财务背景特征的成员比例越高,进行缺陷整改的概率更大,一方面表明外部审计非标准审计意见对内部控制治理效用可能赖于管理层的配合,另一方面也折射出高管人力资源有效配置的重要性。而对披露缺陷修正信息的企业进行跟踪研究,发现这类企业在后续年度仍然会收到“不清洁”的审计意见,反映出这些上市公司的缺陷整改可能浮于表面,并不是实施有效的。     

Probing top-quark operators with precision electroweak measurements

In the standard model effective field theory, operators involving the top quark are generally difficult to probe and can generate sizable loop contributions to electroweak precision observables measured by past and future lepton colliders. Could the high precision of electroweak measurements compensate for loop suppression and provide competitive reaches on these operators? Would the inclusion of these contributions introduce too many additional parameters for a meaningful global electroweak analysis to be performed? In this paper, we perform a detailed phenomenological study to address these two important questions. Focusing on eight dimension-6 operators that generate anomalous couplings between electroweak gauge bosons and third-generation quarks, we calculate their one loop contributions to \begin{document}$ e^+e^- \to f\bar{f} $\end{document} processes, both on and off the Z-pole, and the \begin{document}$ e^-e^+ \to WW $\end{document} process. A global analysis is performed with these eight operators and those that contribute to the above processes at tree level using measurements at the LEP, SLC, and several low energy experiments. We find that although current electroweak precision measurements are sensitive to the one-loop effects of top-quark operators, it is difficult to separate them from the operators that contribute at tree level, making a global analysis rather challenging. Under further assumptions (for instance, new physics contributes to only third generation quark operators and the S and T parameters), competitive reaches may be obtained in a global fit. Another important finding of our study is that the two operators that generate the dipole interactions of the bottom quark have a significant impact on the Z-pole measurements and should not be omitted. We also discuss the implications of the recently reported W-boson mass measurement at the CDF for our results. Finally, we estimate the reaches of future lepton colliders in probing top-quark operators with precision electroweak measurements.     

翻身陀螺的原理简析

描述了翻身陀螺的实验现象,简要介绍了对翻身陀螺的研究史,定性地对普通陀螺和翻身在旋转过程中受力进行了分析。通过对二者受力情况的对比,说明了翻身陀螺翻身现象产生的原因。又从能量角度简要分析了翻身陀螺的运动过程,进一步说明摩擦力是陀螺翻身现象产生的根源。最后总结了翻身陀螺的物理实验带来的启发。     

Pseudoclassical Dynamics of the Kicked Top

The kicked rotor and the kicked top are two paradigms of quantum chaos. The notions of quantum resonance and the pseudoclassical limit, developed in the study of the kicked rotor, have revealed an intriguing and unconventional aspect of classical–quantum correspondence. Here, we show that, by extending these notions to the kicked top, its rich dynamical behavior can be appreciated more thoroughly; of special interest is the entanglement entropy. In particular, the periodic synchronization between systems subject to different kicking strength can be conveniently understood and elaborated from the pseudoclassical perspective. The applicability of the suggested general pseudoclassical theory to the kicked rotor is also discussed.     

“互联网+”背景下新工科多循环镶嵌式“工”型人才的培养模式1)

“互联网+”和制造技术的融合,驱动着产业迅速发展。在“新工科”背景下,本文总结提炼出了“工”型人才概念,提出多循环嵌套式的教育 理念,培养兼具专业素质技能、创新探究能力、责任与时代担当的卓越工程人才。并在实践与不断优化中形成了“课堂—实验—科研”三位一 体的教学模式。致力于为国家建设提供专业素质技能过硬、创新探究能力突出、富有责任与时代担当的工程技术人才保障。