美式仿古家具在国内畅销之原因探析——以深圳圣亚历山大家具公司为例

近年来,美式家具以其简洁、明晰的线条和得体有度的雕刻装饰,正日趋赢得众多国内消费者的青睐。本文以圣亚力山大家具有限公司为例,对美式仿古家具文化内涵、风格特点及所营造的居室氛围作了阐述。     

环境流计算新方法:水文变化的生态限度法

水文变化的生态限度框架(ELOHA)是环境流理论最新成果。ELOHA要求对河流按照水文情势特征进行分类,相同类型河流的水文—生态关系具有相似性。ELOHA还要求对开发前后水文情势变化进行分析,计算现状水文条件与基准水文条件的偏离程度。ELOHA提出了水文情势变化预期生态响应的若干假定,总结了一套为建立水文—生态关系采用的生态指标。在建立大型水文和生物数据库的基础上,运用统计学方法拟合水文—生态函数关系。最后,各利益相关者对水文变化引起的生态风险进行评估,认定可以接受的生态风险水平,再依据水文—生态曲线,确定环境流标准。     

基于大规模语料库的古文词典构建及分词技术研究

古文献的研究有助于传统文化的继承与发扬,而古文分词则是利用自然语言处理技术对古文献进行分析的重要环节.当前互联网拥有大量古汉语文本和词典方面的数据资料,该文提出利用互联网大规模古文语料构建古文基础词典;进而通过互信息、信息熵、位置成词概率多特征融合的新词发现方法从大规模古籍文本中建立候补词典;最终将基础词典与候补词典融...     

改进鱼群算法在模拟机运动洗出优化中的应用

飞行模拟器是模拟和复现真实飞行活动的重要设备,一直以来模拟器的模拟效果也是备受关注的.但是,基于经典洗出算法来还原运动轨迹的运动平台存在参数设置保守、模拟效果不佳等问题,因此本文提出一种基于改进人工鱼群算法的滤波器参数优化方法.该方法基于人体前庭感知误差模型得到相应的目标函数,再利用改进后的鱼群算法对滤波器中的自然截止频率进行寻优,最后通过在Simulink中建立的仿真模型对优化后的滤波器参数进行仿真验证.结果表明:相比于经典洗出算法与基本人工鱼群算法,经改进后算法得到的新参数在算法洗出中可以有效提高运动的感知效果,减小运动误差,并且能够节约更多的运动空间.     

GB 18655—2002中车载零部件发射测量骚扰限值的选择方法

通过实际的两个测试案例,分析讨论了在运用GB18655—2002对车载零部件进行发射测试时,选用适当的骚扰限值的方法。认为以标准中的辐射/传导骚扰的符合性判断流程图为主,宽带骚扰举例及窄带骚扰源的定义为辅,综合考虑,才能选择出适当的骚扰限值,得到正确的测试结果。     

Study of the solubility of Pb,Bi and Sn in aluminum by mixed CALPHAD/DFT methods: Applicability to aluminum machining alloys

The aim of this work is a formulation of a thermodynamic model for the development of new aluminum machining alloys. The three additives Bi, Pb and Sn have proven to help machining. Hence, a review of the literature showed that the liquid phase equilibria and thermodynamic data for the three binary systems Al-Bi, Al-Pb and Al-Sn is very thorough but the limited information for the FCC solution required the use of Density Functional Theory (DFT) to predict thermodynamic data. The partial heat of mixing of these three machining additives in Al(FCC) are obtained and the results helped to improve the thermodynamic model using the CALPHAD method. It was shown that for all three binary systems, the thermodynamic data obtained at three fixed compositions and that obtained for a very dilute solution gave different enthalpy curves. The thermodynamic model was used to compute the ternary systems Al-Bi-Pb, Al-Bi-Sn and Al-Pb-Sn and small adjustable parameters were added to reproduce the literature data.     

A 1916 World War I notebook of Luigi Sacco

Letters, notes, and above all an original notebook by Luigi Sacco dated 1916 have shed new light on the establishment and development of the “Ufficio (or Reparto) Crittografico” of the Italian Army Headquarters in World War I. Three decrypted messages, unpublished until now, are included with Sacco’s comments.