Femtosecond parabolic pulse nonlinear compression with gas-filled hollow-core fiber

We study theoretically the spectral intensity evolutions of the femtosecond Gaussian and parabolic pulses with different initial pulse energies and compare the nonlinear compressions of these pulses based on a meter-long hollow-core fiber filled with neon for different initial pulse durations. The pulses are first coupled into gas-filled hollow-core fiber for spectrum broadening, then compressed by the optimal chirp compensation. The parabolic pulse possesses a shorter pulse duration, larger peak power, and cleaner wings than Gaussian pulse. The properties are useful for compressing the pulses and thus generating the high-energy, short-duration pulses.     

量子随机Cable方程的白噪声分析方法

本文讨论了广义算子及其Wick积意义下的非线性量子随机Cable方程.在给出解的存在唯一性定理的基础上,证明了解对初值过程的连续依赖性及其他性质.     

Joint nonlinear electrical equalization in coherent optical PDM DFT-spread-OFDM systems

We propose a joint nonlinear electrical equalization approach in coherent optical discrete-Fourier-transform spread orthogonal-frequency-division-multiplexing(DFT-spread-OFDM) systems with polarization division multiplexing(PDM).This method is based on an adaptive Volterra series expansion for nonlinear distortions of two orthogonal polarizations.The nonlinear electrical equalization is validated through numerical simulation of 100-Gb/s quadrature phase shift keying and 200-Gb/s 16 quadrature amplitude modulation PDM DFT-spread-OFDM systems.     

平方协变差和连续半鞅的推广Ito^公式

令X是连续半鞅，f是R上的局部可积函数。本文我们将证明，只要∫0tf(Xs)ds存在，那么平方协变差存在且等于-∫Rf(a)daLta,Lat是X的局部时。因此对具有导数f的绝对连续函数F，有推广的Ito^公式F（Xt)=F(X0) ∫0tf(Xs)dXs 1/2[f(X),X]t。     

GENERALIZED OPERATORS AND OPERATOR-VALUED DISTRIBUTIONS IN QUANTUM FIELD THEORY

The relation between generalized operators and operator-valued distributions is discussed so that these two viewpoints can be used alternatively to explain quantum fields.     

随机微分方程终值问题的弱解(英)

设｛Wt．Ft．t∈［0．T］｝为概率空间（Ω，P）上的标准α维Brown运动，为由它生成的自然σ－代数流．本文讨论了如下随机微分方程终值问题弱解的存在性：其中ξ∈L2（Ω，P；Rn），g：［0，T」×Rn×Rnd→Rn为有界可测函数．此外，还讨论了它在金融市场期权定价问题中的应用．     

从《花样漳州》看闽南文化的传播策略

电视节目创新应坚持和弘扬社会主义先进文化,用充满内涵的文化节目鼓舞人、感召人。《花样漳州》是漳州电视台的一档人文生态栏目,讲述漳州人的生活状态和闽南文化烙印。本文通过对节目的剖析、概括,分析了栏目在视听视觉、叙述视点、形象视野方面的创新特点,重点展现了议程设置、意象、媒体融合等传播实践,为新时代中华优秀文化的自觉传承、自信传播提供了参考建议。     

Field-free molecular orientation enhanced by tuning the intensity ratio of a three-color laser field

We theoretically study the field-free molecular orientation induced by a three-color laser field. The three-color laser field with a large asymmetric degree can effectively enhance the molecular orientation. In particular, when the intensity ratio of the three-color laser field is tuned to a proper value of I_3: I_2: I_1= 0.09 : 0.5 : 1, the molecular orientation can be improved by ～ 20% compared with that of the two-color laser field at intensity ratio I_2: I_1= 1 : 1 for the same total laser intensity of 2×10~(13)W/cm~2. Moreover, we investigate the effect of the carrier-envelope phase(CEP) on the molecular orientation and use the asymmetric degree of the laser field to explain the result. We also show the influences of the laser intensity, rotational temperature, and pulse duration on the molecular orientation. These results are meaningful for the theoretical and experimental studies on the molecular orientation.     

基于旋转框的建筑物检测方法与应用

精准地检测建筑物目标在城市规划、灾情评估、军事侦察等方面均有重要意义。针对流行的目标检测方法采用最小包围矩形表示实例不能对多方向型的建筑物进行精确定位的问题,构建了一种端到端的基于旋转框的建筑物检测方法,所提出的方法以RoI Transformer为基础,在不同的特征提取网络上进行实验研究。研究结果表明,模型ResNet+RoI Transformer对多方向型建筑物有较好的检测结果。利用所提出的模型搭建建筑物提取原型系统,系统可以对多种配置模型进行训练,支持对任意尺寸的高分辨率遥感影像进行检测,并可将检测结果转换为矢量文件,不仅在工程上大大降低了人工矢量化带来的成本,还可以为城市规划部门提供快速、准确的建筑基础数据。     

A MODEL FOR WHITE NOISE ANALYSIS IN P-ADIC NUMBER FIELDS

ＡＭＯＤＥＬＦＯＲＷＨＩＴＥＮＯＩＳＥＡＮＡＬＹＳＩＳＩＮＰ－ＡＤＩＣＮＵＭＢＥＲＦＩＥＬＤＳ（黄志远）￥ＡｎｄｒｅｗＫｈｒｅｎｎｉｋｏｖ（ＭｏｓｃｏｗＩｎｓｔ．ｏｆＥｌｅｃｔｒｏｎｉｃＥｎｇｉｎｅｅｒｉｎｇ，１０３４９８，Ｚｅｌｅｎｏｇｒａｄ，Ｋ－...