萨拉齐收费网架检测与分析

钢网架结构是一种结构受力合理、刚度大、重量轻、杆件单一、制作安装方便的空间结构体系,在近一二十年来获得蓬勃发展,并在大跨度、大柱网、大面积的公共和工业建筑中得到广泛应用。主要对钢结构工程的网架节点、剪应力等方面的检测技术进行全过程的跟踪分析,重点研究了大跨度钢网架结构的各种检测技术在实际工作中的运用。通过理论研究和实例分析,最后得出了一些结论和建议,为以后的工程实践提供参考。     

一种扩展多站无源探测定位范围的新方法

长基线时差定位体制的多站无源探测定位系统对采用窄波束发射的辐射源存在一定的难度,影响其实际使用.文中以多站无源探测定位装备的单个侦察站为基础,利用空频域信息实现对目标辐射源的单站无源定位.在保持现有系统硬件不变的基础上,设计了单多站一体化无源探测定位系统结构,讨论了系统实现的关键技术和解决途径,并通过仿真方法提出了单站无源定位对角度、角速度、多普勒频率参数测量的要求,这对改造现有的多站无源定位系统和扩展多站无源探测定位范围具有一定的参考意义和应用价值.仿真实验表明,单站无源定位系统对角度的测量精度要达到mrad量级,角速度的测量精度要达到mrad/s量级,多普勒频率变化率的测量精度要达到Hz/s量级.     

汉语作为第二语言的关系从句习得难度调查

通过句子连接的语言测试任务和调查39名外国留学生汉语关系从句的习得情况,以及分析研究中心词位置和关系从句类型对汉语关系从句习得的影响,并与关系从句习得的八种假设进行对照,结果发现：（1）中心词位置对汉语关系从句的习得没有产生显著的影响;（2）关系从句的类型对习得的影响是显著的;（3）中心词位置还与关系从句的类型交互作用影响二语习得。这主要是由关系从句的加工策略与汉语关系从句的句法结构两个因素共同作用的结果。     

主流意识形态网络风险防御的路径依赖

网络意识形态安全问题涉及不同的层次。总体而言,它自内而外分为文化主权独立、网络阵地巩固、信息边疆完整三个层次。在信息化迅猛发展的态势下,它们均面临不同程度的挑战。为此,应加强意识形态的风险防御。在坚守文化主权的前提下,认识和弥补自身的文化缺憾,不断提升主流意识形态的网络影响力。同时,面对网络文化传播方式和渗透方式的变迁,拓展主流意识形态的网络阵地。还应建立国家“防火墙”,保护信息边疆,从而构筑起多重安全防线。     

Rank-based outlier detection

We propose a new approach for outlier detection, based on a ranking measure that focuses on the question of whether a point is ‘central’ for its nearest neighbours. Using our notations, a low cumulative rank implies that the point is central. For instance, a point centrally located in a cluster has a relatively low cumulative sum of ranks because it is among the nearest neighbours of its own nearest neighbours, but a point at the periphery of a cluster has a high cumulative sum of ranks because its nearest neighbours are closer to each other than the point. Use of ranks eliminates the problem of density calculation in the neighbourhood of the point and this improves the performance. Our method performs better than several density-based methods on some synthetic data sets as well as on some real data sets.     

The calculation of outlier detection statistics

This paper presents a routine that calculates four outlier detection statistics. The routine determines a series of points that are identified as possible outliers, and calculates the values that can be used to test them. These values can be used in an iterative procedure to detect multiple outliers.     

Impact of Childhood Socioeconomic Position on Self‐Rated Health Trajectories of South Korean Adults

The aim of this study was to examine the impact of childhood socioeconomic position (SEP) on adult health trajectory in South Korea. Seven waves of data from the Korea Welfare Panel Study (KOWEPS, 2007–2012; Korea Institute for Health and Social Affairs, 2014 ) were analyzed using latent growth curve analysis. Health condition was measured by self‐assessment. The major independent variables were indicators of childhood and adult SEP. The findings suggest that those who perceive their childhood economic condition to be more affluent are more likely to assess their health to be better at the intercept. The insignificant effect of childhood economic condition on the slope and the quadratic term suggest that the initial gap remains over time. On the other hand, a disruption in education as a result of poverty was significantly associated with the intercept, slope, and quadratic term. The results suggest that although the large gap at wave 1 somewhat decreases, the gap in health remains because of the significant quadratic term. Childhood SEP has a a lasting effect on adult health trajectories, after controlling for adult SEP. Significant findings support policies and programs that are targeted to reduce socioeconomic disparities in childhood to enhance equality and public health.     

Blind source separation filters-based-fault detection and isolation in a three tank system

Fault detection and Isolation takes a strategic position in modern industrial processes for which various approaches are proposed. These approaches are usually developed and based on a consistency test between an observed state of the process provided by sensors and an expected behaviour provided by a mathematical model of the system. These methods require a reliable model of the system to be monitored which is a complex task. Alternatively, we propose in this paper to use blind source separation filters (BSSFs) in order to detect and isolate faults in a three tank pilot plant. This technique is very beneficial as it uses blind identification without an explicit mathematical model of the system. The independent component analysis (ICA), relying on the assumption of the statistical independence of the extracted sources, is used as a tool for each BSSF to extract signals of the process under consideration. The experimental results show the effectiveness and robustness of this approach in detecting and isolating faults that are on sensors in the system.     

Theoretical limits of component identification in a separable nonlinear least-squares problem

We provide theoretical insights into component identification in a separable nonlinear least-squares problem in which the model is a linear combination of nonlinear functions (called components in this paper). Within this research, we assume that the number of components is unknown. The objective of this paper is to understand the limits of component discovery under the assumed model. We focus on two aspects. One is sensitivity analysis referring to the ability of separating regression components from noise. The second is resolution analysis referring to the ability of de-mixing components that have similar location parameters. We use a wavelet transformation that allows to zoom in at different levels of details in the observed data. We further apply these theoretical insights to provide a road map on how to detect components in more realistic settings such as a two-dimensional nuclear magnetic resonance experiment for protein structure determination.     

凡俗世界的歌者--论池莉小说的平民意识

池莉是当代中国文坛执著于颂扬市井平民凡俗生活的作家之一.她坚守平民价值立场,显现出歌颂庸常人物、凡俗人生的写作姿态;运用洒脱通达、幽默风趣而又不动声色的叙述话语和平民化的人物语言,真诚地面对现实人生,描摹日常生活的原生形态;展现困在爱情婚姻中的市井平民的生活.