相干体技术在火山岩预测中的应用

火山岩气藏地质特征复杂，岩相变化快，物性变化大，地震响应特征复杂，规律性差，预测困难。三维相干技术可以通过检测同相轴的不连续性，对断层、特殊岩性体进行识别。在松辽盆地北部徐家围子断陷深层火山岩的研究中，利用体属性多算子相干分析技术计算了高分辨率相干体、倾角体和方位角体，并采用HLS（色调、光亮度和饱和度）彩色模型显示这些地震属性体；然后结合三维可视化技术对火山岩的分布范围进行了预测。在相干体切片上，断层清楚，火山口和火山岩体分布范围清晰。     

Self-trapping Characteristics of Partially Coherent Optical Beam in Photonic Crystal Fiber under Compton Scattering

Using the mutually coherent function, the self-trapping of the circle partially coherent optical beam in the total internal reflective photonic crystal fiber（TIRPCF） under Compton scattering is studied. The study shows that the composition of the non-coherent optical beam in the optical spectrum and the diffraction effect are decreased by Compton scattering, and the probability of forming the soliton is greatly increased. The vibration peak value in the propagation, compressed degree, changed cycle, and radius of the soliton are all smaller than those before the scattering, but its coherent radius is larger than that before the scattering. In this propagation, the self-focusing plays a key role.     

A Possible Mechanism for Evading Temperature Quantum Decoherence in Living Matter by Feshbach Resonance

A new possible scenario for the origin of the molecular collective behaviour associated with the emergence of living matter is presented. We propose that the transition from a non-living to a living cell could be mapped to a quantum transition to a coherent entanglement of condensates, like in a multigap BCS superconductor. Here the decoherence-evading qualities at high temperature are based on the Feshbach resonance that has been recently proposed as the driving mechanism for high T_c superconductors. Finally we discuss how the proximity to a particular critical point is relevant to the emergence of coherence in the living cell.     

用相干函数消除系统反共振对燃气流冲击载荷识别结果的影响

在进行燃气流冲击载荷识别时,识别结果中存在系统特性的影响.文献[1]中,用系统的受迫响应进行识别.在识别结果中,系统反共振特性的影响仍不能消除.根据文献[2],用相干函数对识别谱进行修正,在识别结果中可以很好地消除系统反共振特性的影响.     

色噪声环境下信源数目估计的线性插值法

为了减轻加性色噪声对信源数目估计性能的影响,本文提出了一种基于相干矩阵特征值分布曲线线性插值的信号检测方法.构造适当的代价函数,避免了对数似然函数的使用,该方法对色噪声协方差矩阵特征值分散具有稳健性,同时具有较低的计算复杂度和适用于相关甚至相干源等优点.其有效性由大量的计算机仿真结果得到了验证.     

光纤低相干干涉测量法的光谱域处理技术

使用低相干宽带光源可使光纤传感器系统实现高分辨率和大动态范围。本文介绍了在具有这种特点的光源下应运而生的光谱域处理技术。     

A 4D Ray Tracing

We are going to present a survey of techniques using temporal coherence in between frames to render animation sequences with ray tracing. A new method using temporal coherence in the ray space (lightpath of rays) is proposed. The goal of this technique is to factorize intersection and illumination calculations over the frames of the sequence. An optical event springing out many times in the sequence is computed once. The method is based upon 4D intersection calculations between temporal rays and moving objects. At the end of this paper, we present measurements showing the number of rays we need not calculate with our solution. These results come from simulating the algorithm behavior through a graphic and statistic ray analyser tool.     

Towards a temporal coherence management in real-time knowledge-based systems

The multi-agent system paradigm emerges as an interesting approach in the Knowledge-Based System (KBS) field when distributed problem-solving techniques are required. On the other hand, temporal representation and reasoning problems arise in a wide range of KBS application areas where time plays a crucial role. In this paper, we show that when agents run concurrently and access common temporal data, some problems of coherence arise. We analyse the different cases in which an incoherence in temporal information can occur and provide a method to tackle this problem. In this method, conflict management is handled by means of exception handlers and control rules allowing the users to explicitly define their own strategy for temporal coherence solving.     

关于风险度量:期望亏空、最坏条件期望和尾部条件期望的等价定理

风险管理是当今金融行业中最优考虑的事之一，而风险定量化研究又是风险管理的中心任务之一，从方差—协方差、风险价值到条件风险度量(如条件风险价值、尾部条件期望、最坏条件期望以及期望亏空)，已经逐渐被人们所接受并广泛地应用于金融行业和非金融行业。研究了条件风险度量之间的联系，给出了它们之间相等的一个充分必要条件。