洛阳方言的方位和时间后缀

洛阳方言中有而普通话没有的方位后缀有20个、普通话里有而洛阳方言中没有的方位后缀有4个、洛阳方言与普通话都有的方位后缀有7个（包含零形式后缀）;洛阳方言中有而普通话没有的时间后缀有7个、洛阳话和普通话里都有的时间后缀有6个（包含零形式后缀）。总体上讲,洛阳方言与普通话在方位和时间后缀的使用方面既有共性又有差别,差别大于共性。     

海南五指山苦丁茶黄酮含量测定的研究

通过测定海南五指山不同等级苦丁茶中黄酮的含量,并与国内其他地区的苦丁茶黄酮含量比较,发现五指山苦丁茶有较好的药用价值,具备良好的地域竞争优势和发展前景。     

A simple method for estimating parameters of the location–scale distribution family

The purpose of this paper is to estimate the parameters of the location–scale distribution family. As a special case, the method is used for estimating the parameters of the normal distribution and Cauchy distribution. For the Cauchy distribution, neither the moment estimation method nor the maximum likelihood estimation method works properly for estimating the parameters. The quantiles for obtaining confidence intervals and point estimates for the parameters of the two-parameter Cauchy distribution are given in the paper. It is shown that the estimators obtained in this paper are unbiased with respect to the median and possess some optimal properties.     

Modified BLUEs and BLIEs of the location and scale parameters and the population mean using ranked set sampling

Ranked set sampling (RSS) is a sampling procedure that can be used to improve the cost efficiency of selecting sample units of an experiment or a study. In this paper, RSS is considered for estimating the location and scale parameters a and b>0, as well as the population mean from the family F((x?a)/b). Modified best linear unbiased estimators (BLUEs) and best linear invariant estimators (BLIEs) are considered. Numerical computations with different location-scale distributions and different sample sizes are conducted to assess the efficiency of the suggested estimators. It is found that the modified BLIEs are uniformly higher than that of BLUEs for all distributions considered in this study. The modified BLUE and BLIE are more efficient when the underlying distribution is symmetric.     

Linear estimation for the extended exponential power distribution

Tiao and Lund [The use of OLUMV estimators in inference robustness studies of the location parameter of a class of symmetric distributions. J Amer Statist Assoc. 1970;65(329):370–386] tabulated the coefficients of the best linear unbiased estimators (BLUEs) of location and scale for a particular family of symmetric distributions. This family was a reparameterization of the extended exponential power distribution (EEPD) with the shape parameter restricted to be greater than or equal to one. In this work, we consider the BLU estimation of the location and scale parameters of the EEPD when the shape parameter is one-third and one-half. We obtain closed-form expressions for the single and product moments of the order statistics when the shape parameter is in general in the form of a reciprocal of an integer. These expressions are then used to determine the BLUEs and the corresponding variances for complete samples of size 20 and less. We consider some other linear estimators of the location and scale parameters and then compare them with the BLUEs. Finally, we present a numerical example to illustrate the developed results.     

内源性眼跳前注意转移的时间进程

研究采用双任务范式、运用眼动追踪系统探讨内源性眼跳前注意转移的机制及其时间进程。结果发现:1.内源性眼跳前已经发生注意转移;2.内源性眼跳前注意转移从眼跳准备期最初就存在。一旦在眼跳指令得到加工后,注意转移迅速开始,并且在开始的50ms至100ms左右增速最快。从整个过程来看,注意转移至目标位置的程度随时间的向后推移而不断增大;3.眼跳目标与当前注视位置的间距对于注意在时间上的转移程度没有显著影响。在相对当前注视点较远的位置,被试对目标特征的平均辨别正确率显著低于较近位置。     

移动LBS用户接受模型的实证研究

移动互联网中具备移动性、社交性和基于位置的服务(LBS,location based service)最具发展潜力。通过分析文献和研究调研提出扩展后的技术接受模型(TAM),并且对最终模型的假设条件用统计软件进行了验证。实证证明了移动LBS业务的使用意向受感知易用性、感知娱乐性、网络外部性和隐私这四大因素的显著影响。最后对本研究结果进行了讨论,在指出研究意义的同时指出了不足之处。     

三机无源定位二维布阵优化研究

针对三机无源定位二维布阵优化问题,提出了基于有效定位区面积最大准则的最优布阵方法.文中以三机时差定位、频差定位及时频差定位为例,描述了三机无源定位模型,接着基于克拉美-罗限引入了有效定位区的概念,并以其面积最大作为布阵优化准则,通过仿真研究了二维布阵优化问题.仿真结论反映了三机时差、频差及时频差定位体制的不同特性,具有较强的实际指导意义.     

试论城头山遗址古城的规划——兼论我国城镇化建设的规划问题

作为我国最古老的城市,城头山古城的规划遵循着古老的天人合一哲理,体现着华夏民族智慧,在城市定位、空间布局方面为我们留下了丰富的遗产。其城市定位比较全面、合理;其空间布局方位明确、主次分明、功能分区相互协调。城头山古城规划对我国正在进行的城镇化建设具有无可置疑的启迪意义:在城镇定位规划方面,既从历史与实际出发,又着眼于长远发展;既突出重点,又兼顾其他。在城镇空间布局规划方面,追求科学、和谐与自然,坚持以人为本。