激光雷达距离欺骗干扰技术研究

文章主要介绍激光雷达测距的原理,激光测距机的组成及各部分的功能,根据其原理,介绍一种常用的距离欺骗的方法-数字储频技术,阐述其距离假目标欺骗的原理,对其工作过程进行仿真。研究表明,采用数字储频技术能够有效的进行欺骗,这种技术既可以用于掩护空防,又可以用于干扰敌方并诱敌开机,暴露其真实的兵力部署,因此具有相当大的军事意义。     

How much exercise are older adults living in nursing homes doing in daily life? A cross-sectional study

Information on the amount of exercise practised by nursing home (NH) residents is scarce. This study aimed at describing NH residents’ participation in exercise classes, as well as to examine whether the presence of a professional exercise instructor in the facilities is associated with residents’ exercise habits. The cross-sectional data of 5402 residents (median age = 88 years; mostly women (75.2%)) from 163 NHs in France were analysed. Adjusted logistic and linear regressions were performed to examine whether the presence of a professional exercise instructor in the NH was associated with exercise habits: exercise participation, frequency, duration, and levels. From the 5402 participants, 1914 were participating in exercise classes provided in the NH. Most of them had an exercise frequency of 1x/week or less. Median duration of exercise sessions was 45 min. Exercise levels were rated as: highly active (n = 487), intermediately active (n = 1096), and poorly active (n = 331). The presence of a professional exercise instructor working in the facility was significantly associated with exercise participation and with higher exercise frequencies and levels, and session duration. In conclusion, the presence of professional exercise instructors is associated with better exercise habits in NH residents. Improved exercise habits may potentially be translated into better health in this population.     

2005-2014年图书情报学4刊发文著者的统计分析

通过对2005—2014年图书情报学4刊论文著者的统计,对合著率、著者发文规律、高产著者年龄、地区及单位分布进行分析,并归纳国内图书情报学的发展规律。     

A corpus-based comparison of the use of divide and separate

Divide and separate are semantically similar,however,in English teaching and learning,it is not easy to explain how they are used and learners of English often confuse them.Based on the Corpus of Contemporary American English(COCA),this essay compares the use of these two words by analyzing the collocations with prepositions,cardinal numbers and nouns.     

溶胶凝胶法制备NiZn铁氧体的性能研究

通过溶胶凝胶法制备NixZn1-xFe2O4(x=0.2,0.4,0.6,0.8)铁氧体粉体.XRD显示制备的样品具有良好的尖晶石结构.研究了其磁性能比如密度、起始磁导率、Q值和截止频率.     

An efficient method of addressing ectopic beats: new insight into data preprocessing of heart rate variability analysis

Heart rate variability (HRV) analysis is affected by ectopic beats. An efficient method was proposed to deal with the ectopic beats. The method was based on trend correlation of the heart timing signal. Predictor of R-R interval (RRI) value at ectopic beat time was constructed by the weight calculation and the slope estimation of preceding normal RRI. The type of ectopic beat was detected and replaced by the predictor of RRI. The performance of the simulated signal after ectopic correction was tested by the standard value using power spectrum density (PSD) estimation, whereas the results of clinical data with ectopic beats were compared with the adjacent ectopic-free data. The result showed the frequency indexes after ectopy corrected had less error than other methods with the test of simulated signal and clinical data. It indicated our method could improve the PSD estimation in HRV analysis. The method had advantages of high accuracy and real time properties to recover the sinus node modulation.     

我国英语专业学生话语标记使用策略调查分析

话语标记语对话语的整体连贯和构建起着重要作用。运用大量的真实语料调查了我国学生口语话语标记的使用情况,并从定量、定性的角度分析比较高分组和低分组学生使用话语标记时存在的差异及导致这种结果的可能原因,将对二语学习者提高口语会话策略、口语教学和口语能力测评等提供一定的借鉴意义。     

论中国少数民族服饰中蕴含的图腾文化

针对我国少数民族服饰中的图腾文化,介绍了图腾文化的源流,论述了图腾在服饰上的物态化体现及常见的物态化手段,分析了服饰图腾的缤纷化特征,以及在不同民族和相同民族的不同支系两个层面上的含义,并以动物图腾中常见的老虎、公牛、神鹰、犬、蛇和青蛙为例,归纳了常见共用图腾纹样及其共有民族,总结出服饰图腾纹样的广谱化特征。     

时间之环——《解忧杂货店》的时间变形

《解忧杂货店》是日本当代推理小说家东野圭吾的一部非推理小说。在该作品中,作者非但没有制造凶杀案与寻找真相的紧张感,反而给读者带来满满的感动以及拼搏向上的正能量。东野圭吾的这部作品除了选材精妙之外,他通过灵活变换叙述时间是小说的叙事时间形成了一个封闭的圆环,从而使五个故事环环相扣,结构十分独特。笔者试图以时距为线索来分析这部作品的魅力。