中美自然写作中“鸟”意象的生态意蕴探微——以约翰·缪尔与张炜的生态散文为例

约翰·缪尔被誉为美国自然保护的领袖,其力作《我们的国家公园》曾产生极为广泛的影响。我国作家张炜的散文集《我选择,我向往》蕴涵着浓郁的生态意识。文章运用叙事学相关理论,从叙事方式、叙事话语、叙事视角等方面分析缪尔、张炜上述作品中以＂鸟＂意象为载体的生态意蕴及各自的艺术魅力。     

度量空间的紧覆盖π的（P）映像

本文建立了度量空间的紧覆盖π的（P）映像的内在特征,即证明了X是度量空间的紧覆盖π的（P）映射下的像当且仅当X具有性质（P）的紧有限分解的点星网.     

塑料门窗质量影响的因素分析

本文介绍了塑料门窗的加工制作安装过程中各种对门窗质量的影响因素,并进行了分析,结合实际工作经验指出了具体的要求和措施,从而保证了塑料门窗的质量.     

一种应用于智能电网的多路数据采集系统设计

数据采集技术是信息科学的一个重要分支,更是智能电网中一项重要的技术。设计出了一种具有8通道模拟量输入及开关量输入/输出、日历等功能的通用多路数据采集系统,采用的控制器的核心器件为TI公司的MSP430F149,指出该系统具有功耗低、体积小、易操作等优点。     

Consecutive tracking for ballistic missile based on bearings-only during boost phase

This paper proposes a modified centralized shifted Rayleigh filter(MCSRF) algorithm for tracking boost phase of ballistic missile(BM) trajectory with a highly nonlinear dynamical model based on bearings-only.This paper contributes three folds.Firstly,the mathematical model of an MCSRF for multiple passive sensors is derived.Then,minimum entropy based onedimensional optimization search to adaptively adjust the probability of the different filters for real time state estimation is deployed.Finally,the unscented transform(UT) is introduced to resolve the asymmetric state estimation problem.Simulation results show that the proposed algorithm can consecutively track the BM precisely during the boost phase.In comparison with the unscented Kalman filter(UKF) algorithm,the proposed algorithm effectively reduces the tracking position and velocity root mean square(RMS) errors,which will make more sense for early precision interception.     

高位钻孔瓦斯抽采参数优化设计

基于采空区覆岩裂隙分布规律、覆岩裂隙瓦斯流动规律和高位钻孔抽采技术研究现状,从覆岩"竖三带"、"O"形圈和U型通风条件下采动裂隙瓦斯流动规律出发,找出高位钻孔的理论合理布置区域,指出工作面后方50m范围内覆岩裂隙发育状况是高位钻孔层位设计的关键,针对祁南煤矿32煤层的特点,结合现场采用数值模拟方法模拟不同开采速度条件下覆岩裂隙发育规律,优化设计高位钻孔的抽采参数,在34下2工作面和3410工作面的现场试验中,高位钻孔抽采浓度和抽采率得到大大提高,取得了较好的抽采效果,验证了研究的正确性。     

一类反周期函数插值算子的推广

建立了反周期函数的（0,δP）插值算子,得到了插值问题解的相关结论,是对（0,P（D））插值算子的一种推广.     

说“休”道“闲”

论述"休"、"闲"二字的原初构形意图,梳理二者意义发展的线索及其与相关字词的意义联系。指出休的字形构意与表示哺乳的乳字有相似之处,人对自然物的依赖犹如小孩对母亲的依赖,是文章的一个亮点。     

Studies of layout of world machine tools industry based on patent analysis

As the foundation of an industrialized country nowadays, machine tools industry is regarded as the engine of industrial development of a country. The developed countries, such as USA, Germany and Japan, have widely deployed the technology of using the patent in order to keep their strength in various fields. This research examins the CNC machine tools industry in the world by using the pa- tent analysis method. It first gives an overview about the world patent application in CNC machine tools industry from 1963 to 2010 and divides the development of the industry into five stages. It also lists the patent application of the world top 20 countries, where the top 5 countries are compared. The patents of the world top 10 companies of machine tools manufacturers are mapped according to the international patent classification （IPC）, and the future trends of world machine tools industry are discussed. Finally conclusions and suggestions are presented.