Monitoring the charge bunch-by-bunch for the SSRF storage ring:Development and application

Bunch charge uniformity controlling is very important for top-up operation of the storage ring. In order to monitor filling pattern and measure the bunch charge precisely, a PXI waveform digitizer-based data acquisition system has been developed to retrieve bunch charge information from BPM pickup signals. An effective sampling rate is extended to 400 GHz by waveform rebuilding technology, which overlays multi-turn data into single turn with real time sampling rate of 8 GHz. An on-line evaluation indicates that resolution and linearity of the charge measurement are better than 0.5% at input range of 0.5-12 nC.     

图形识别中的预览效应

预览搜索是研究视觉搜索的新范式,本文以正五、六边形为实验材料,采用预览搜索范式,考察图形识别中是否存在预览效应及其产生的认知机制。结果发现:(1)当新、旧客体颜色不一致时,产生了完整的预览效应;(2)当新、旧客体颜色一致时,只产生了部分预览效应。说明图形识别中存在预览效应,且它是基于旧客体"位置"和"颜色"抑制共同作用的。     

鸭江大桥连续刚构0#块托架施工设计

利用有限元数学模型分析连续刚构0#块托架施工特点、受力特性,较为详细地阐述了鸭江大桥连续刚构0#块托架的施工工艺、施工难点和施工方案。     

A framework for mining interesting high utility patterns with a strong frequency affinity

High utility pattern (HUP) mining is one of the most important research issues in data mining. Although HUP mining extracts important knowledge from databases, it requires long calculations and multiple database scans. Therefore, HUP mining is often unsuitable for real-time data processing schemes such as data streams. Furthermore, many HUPs may be unimportant due to the poor correlations among the items inside of them. Hence,the fast discovery of fewer but more important HUPs would be very useful in many practical domains. In this paper, we propose a novel framework to introduce a very useful measure, called frequency affinity, among the items in a HUP and the concept of interesting HUP with a strong frequency affinity for the fast discovery of more applicable knowledge. Moreover, we propose a new tree structure, utility tree based on frequency affinity (UTFA), and a novel algorithm, high utility interesting pattern mining (HUIPM), for single-pass mining of HUIPs from a database. Our approach mines fewer but more valuable HUPs, significantly reduces the overall runtime of existing HUP mining algorithms and is applicable to real-time data processing. Extensive performance analyses show that the proposed HUIPM algorithm is very efficient and scalable for interesting HUP mining with a strong frequency affinity.     

The Impact of Selective Oxidation on the Phase Transformation in the Sub‐Surface of Advanced High Strength Steels

The present paper contributes in the discussion of heterogeneous gas/metal reactions by discussing the influence of the dew point (dp) during intercritical annealing on the sub‐surface constitution. Annealing trials with different Advanced High Strength Steels (AHSS) were carried out and the element distribution within the sub‐surface was analysed by glow discharge optical emission spectrometer (GD‐OES). For modelling purpose the gained element distribution data were adjusted in a way that the selective oxidation products were considered within the sub‐surface element profiles. Several transformation temperatures along the depth profiles according to the adjusted GD‐OES data have been computed for the dp ?30 °C and +5 °C. In all cases the according models have been implemented in Matlab. The thermodynamic data have been obtained via the Matlab‐ThermoCalc interface. Empirical equations have been applied for the determination of the bainite and martensite start temperatures. It is shown that the sub‐surface constitution and the transformation temperature differ significantly. In most cases the change of the transformation temperature within the surface and sub‐surface reaches up to 100 °C compared to the bulk. For a Dual‐Phase (DP) Steel with C(0.15%)Mn(1.7%)Al(1.7%)Cr(0.5%), the change of the A_e1‐temperature is with 300 °C significantly higher. However one has to keep in mind that the 2‐phase composition can not be assumed to be constant during intercritical annealing. It is therefore concluded that for the purpose of simulating the selective oxidation processes during intercritical annealing of AHSS the continuous change of the sub‐surface constitution must be incorporated in the future work.     

余东古镇空间结构研究

余东，古称“凤城”是南通海门境内为数不多有城池的千年古镇。四面环绕的护城河、类似凤凰展翅的总体布局形成的古镇自然空间显示着古镇选址的意涵和营造的独具匠心；延伸至南门外的南北大街和众多的东西向小巷形成鱼骨状的街道布局，特殊的环境造就典型的江北水空间特征，具有商业、居住、宗教的功能建筑以及类型丰富的街道界面和古镇肌理变化形成的物质空间彰显着千年古镇昔日的地位和繁华。     

2010年我国房屋市政工程生产安全事故分析

依据住房和城乡建设部事故快报,对2010年我国房屋市政工程生产安全事故的总体状况进行分析,并从地区分布、季节分布、时间分布、类型分布四个方面剖析我国房屋市政工程生产安全事故分布情况。进一步分析高处坠落、物体打击、坍塌三种主要事故类型的分布规律和特点,提出相应的防范措施。     

关于二阶模糊随机过程均方Henstock-Stieltjes积分

研究了二阶模糊随机过程均方Henstock-Stieltjes积分的分部积分法，给出了二阶模糊随机过程第一形式均方Henstock-Stieltjes积分和第二形式均方Henstock-Stieltjes积分的存在性条件．这些结论对研究模糊随机过程积分和微分方程的理论将起到很重要的作用．     

Beyond Electromagnetic and Mechanical World‐views: J. Larmor's Models of Matter and Energy in the Early 1890s

In the last decades of the nineteenth century, the relationship between matter and energy was widely debated, mainly in the context of electromagnetic theories. In the 1880s and early in the 1890s, Larmor swung between Helmholtz and Maxwell's theoretical models. In 1893, he put forward a renewed Maxwellian approach centred around the relationships between electricity and matter, and between electric and chemical phenomena. Both the electromagnetic theory and the theory of matter were based on the assumption of a rotationally elastic aether. In 1894, he introduced the ‘electron’, namely a subatomic unit of matter and electric charge, stemming from a continuous aether as a knot of rotational energy. He tried to connect continuous models to discrete models; he tried to connect the intimate nature of matter to the intimate nature of energy. In particular, he aimed at unifying physics, starting from a primitive medium, whose motions could produce regular structures and regular perturbations. New bold hypotheses, like electrons' ‘steady motion’ inside atoms, were the price Larmor had to pay for that integration. I find that Larmor's theoretical contribution cannot be qualified as an electromagnetic world‐view, just because he tried to go beyond a purely mechanical or a purely electromagnetic foundation of physics.