共享存储多处理机系统中的多级高速缓存

共享存储多处理机系统中，存储子系统的性能是影响整个系统性能的关键之－。我们通过基于访存地址流的模拟，从缺失率，平均访存时间和总线占用三方面，对共享存储多处理机系统中的两种两组缓存方案做了性能比较，并将它们同没有第二级缓存的情形做了性能比较。     

基于多窗口相干性的倾角导向主分量滤波

为了在压制地震数据噪声的同时保持反射结构边缘信息和有效频率成分,研制了基于多窗口相干性的倾角导向主分量滤波方法,该法结合边缘保持滤波,可实现多窗口边界保持和主分量滤波。将此法用于多道地震记录提取有效信号的特征值重构信号,可以提高地震记录的信噪比。利用多窗口相干性扫描和二次曲线/面拟合计算二维/三维地层的精确视倾角,以相干值最大时的倾角导向窗口内的地震道数据作为主分量滤波的输入,实现输入主分量滤波器的子体数据的自动选择。实际资料的应用和分析表明,基于多窗口相干性的倾角导向主分量滤波方法在增强同相轴连续性的同时,也加强了有用的不连续性信息（如断层）,避免了由于滤波作用而引起的地震图像边缘模糊,可清晰地刻画地层的几何形态和展布特征,且能够较好地保持原始地震数据体的有效频率成分和地震纵向分辨率。     

Frequency domain control of quantum state singlet/triplet character and prospects for an all-optical spin switch

In recent years, quantum optics has been expanded from atomic to molecular systems despite much weaker oscillator strengths and complex relaxation pathways that have presented serious challenges in the past. The richness of molecular excitation pathways and the variety of molecular interactions has made it possible to develop novel applications in this field. We have demonstrated how the Autler–Townes effect can be used to control molecular angular momentum alignment and how the Autler–Townes split line shape, combined with accurate control-laser electric field amplitude measurement, can be used to map the absolute magnitude of the molecular internuclear distance dependent electronic transition dipole moment function. In addition, the electric field amplitude in the control laser Rabi frequency can be used as a ‘tuning’ mechanism for the mixing coefficients of energy levels that are weakly perturbed by the spin–orbit interaction, i.e. to control the valence electron spin polarization and the spin multiplicity of molecular quantum. We propose an extension of this control mechanism to an all-optical spin switch.     

考虑时间和空间效应的连续梁桥地震反应分析

当桥梁较长时,不计行波效应和相干效应计算地震反应是不明智的.通过选择合适的参数,时间历程法能得到与反应谱法相近的结果.如忽略行波效应和空间效应,计算结果可能大于或小于一致激励结果.至于多长桥梁需考虑行波效应和相干效应,通常由场地类型和设计经验决定.     

Investigation of Resonant Power Oscillation in Halden Boiling Water Reactor Based on Noise Analysis

In the Halden Boiling Water Reactor (HBWR), a resonant power oscillation with a period around 0.04 Hz is observed at power levels higher than about 9.5 MWt. Although this resonant oscillation is not so strong as to affect the normal reactor operation, it is significant, from the viewpoint of reactor diagnosis, to reveal the cause of this oscillation as well as to understand its characteristics.

Noise analysis based on the autoregressive (AR) modeling technique together with spectral and correlation analyses is performed to investigate the driving source, which indicates that it is attributed to the dynamic interference with the reactor of heat exchange process in two parallel-connected steam transformers.

The present study demonstrates the effectiveness of the technique applied here for determining the so-called noise source inducing variations of quantities in a system together with its applicability to various problems in the field of reactor noise analysis and diagnosis.     

压力问题下的衔接策略研究

分析研究了回答压力问题时的衔接策略。提出了认同策略、调整策略和转换策略,说明了不同策略适用的范围,以期在提问与回答间建立起成功的衔接。     

Measuring the Degree of Convergence among European Business Cycles

The dating of a possible European business cycle has been inconclusive. At this stage, there is no consensus on the existence of such a cycle, or of its periodicity and amplitude, or of the relationship of individual member countries to that cycle. Yet cyclical convergence is the key consideration for countries that wish to be members of the currency union. The confusion over whether and to what degree the UK is converging on the cycles of its European partners, or whether its cycle is more in line with the US, is one example of this lack of consensus. Moreover, countries will vary in the components and characteristics that make up their output cycles at any moment, as well as in the state of their cycle. In this paper we show how to decompose a business cycle into a time-frequency framework. This allows us to decompose movements in output, both at the European level and in member countries, into their component cycles and allows those component cycles (and the coherence between them) to vary in their importance and cyclical characteristics. That then allows us to determine if the inconclusive convergence results obtained so far have appeared because member countries have some cycles in common, but diverge at other frequencies. Jel Classification No: C22, C29, C49, F43, O49     

3D monitoring of delamination growth in a wind turbine blade composite using optical coherence tomography

In this paper, delamination and delamination growth in a glass fiber composite used for the spar webs in wind turbine blades is investigated by optical coherence tomography (OCT). The cross-sectional and volumetric images clearly showed the microstructure and the crack within the specimen. After applying an optimized signal processing algorithm, 3D crack growth measured using OCT were demonstrated for the first time to the best of our knowledge. The crack structures inside the composite material at different stages during the delamination growth were revealed.     

Efficient Handling of Lock Hand-off in DSM Multiprocessors with Buffering Coherence Controllers

Synchronization in parallel programs is a major performance bottleneck in multiprocessor systems.Shared data is protected by locks and a lot of time is spent on the competition arising at the lock hand...     

近场声全息中的声场分解技术

为了系统地探讨偏相干分解和奇异值分解方法在工程上的适用范围,研究了参考传声器布置位置、各声源幅值水平差异和测量噪声等因素对这两种方法的影响.结果表明,在正确使用参考传声器信号排列顺序的前提下,偏相干分解方法的分解效果要优于奇异值分解方法,最后通过音箱试验证明了这个结论.