氨纶纤维的生产技术及发展趋势

本文概述了氨纶纤维的用途、生产方法和生产工艺，对氨纶纤维技术发展趋势、国内外氨纶纤维现况进行了分析，并着重对熔纺氨纶丝进行了介绍，对国内氨纶纤维的发展及外资企业抢滩中国氨纶市场的现象提出建议。     

关于隧洞围岩破坏特征的连续-离散耦合分析

为探究不同侧压系数下断面形状对隧洞破坏特征的影响,基于齐热哈塔尔地区地质条件,构建连续-离散耦合数值模型,从洞室围岩塑性区演化、洞室围岩位移及裂纹发育状态进行探讨.结果表明:断面形状相同时,随着侧压系数的增加,洞室顶底板塑性区变化较为明显,且位移集中区域由两帮转移至顶底板;洞室顶底板始终为拉剪复合破坏,而两帮则随着侧压系数的增加由张拉破坏变为拉剪复合破坏;侧压系数一定时,圆形断面洞室破坏程度最小.     

论全媒体时代我国政府形象的塑造

信息技术的不断突破,传统媒介与新兴媒介的日益融合,使得我们正在迈向一个集“数字化”和“信息化”于一体的全媒体时代。全媒体的发展弥补了传统媒体的不足,有助于政府形象的即时塑造和修复,它作为一把“双刃剑”,也为政府形象的塑造带来了严峻的挑战。     

Reconsidering the Relationship between Inflation and Relative Price Variability

It has long been popularly believed that the relationship between inflation and relative price variability (RPV) is positive and stable. Using disaggregated CPI data for the United States and Japan, however, this study finds that the relationship is neither linear nor stable over time. The overall relationship is approximately U‐shaped around a nonzero threshold inflation rate. RPV therefore changes not with the inflation rate per se, but with the deviation of inflation from the threshold inflation rate. More importantly, the relationship is by no means stable over time but instead varies significantly in a way that coincides with regime changes of inflation or monetary policy. The relationship was positive during the period of high inflation of the 1970s and the early 1980s, as has been documented by a number of previous studies, whereas it takes a U‐shape profile during the Great Moderation. The results are robust to the use of core inflation, which excludes the traditionally volatile prices of food and energy. This paper then presents a modified version of the Calvo‐type sticky price model to describe the observed empirical regularities. Simulation experiments show that the modified Calvo model fits the data well, and that the underlying relationship hinges upon the degree of price rigidity, which is systematically related to inflation regime. For countries and periods with low inflation rates, the relationship takes a U‐shape as price adjustment is more sticky. In a high‐inflation environment, when price setting becomes more flexible, the U‐shaped profile vanishes.     

一种新的SC—FDE系统粗定时同步算法

定时同步是单载波频域均衡(SC-FDE)系统的一项关键技术,其中的粗定时同步算法决定着同步收敛速度,由Schmidl和Cox提出的传统算法中出现的测度峰值平台影响着粗同步的精度与速度。通过训练符号格式的重新设计,利用其中4个相同部分良好的相关特性,提出了一种基于特殊训练符号的粗同步算法。仿真结果表明,在高斯白噪声信道和多径衰落信道条件下,新算法定时偏差估计的方差和均值接近于理论值,粗定时同步能够精确地完成,较好解决了测度峰值平台问题。     

Development Zones Flourish in Beijing

Based on the Beijing Municipal Govern- ment's plans for developing the city and neighboring suburbs,and after more than 10 years in development,the Beijing De- velopment Zones have taken shape,each with their own characteristics.Beijing now has three state- level development zones:Zhongguancun Science Park,the Beijing Economic and Technological De-     

预应力梁高强、超早强混凝土的配制技术

本文介绍了水泥掺减水剂、减水剂和水泥双掺粉煤灰与减水剂和水泥双掺磨细矿碴的三个配合比设计方案,比较了52.5MPa水泥和42.5MPa的配制效果,同时也比较了各种掺合料在不同掺量时的配制强度,配制出了3天达设计等级强度90%,可同时满足预制梁和连续梁施工技术要求的高强、超早强预应力混凝土配合比设计方案。     

退休老年人身体形态与力量素质相关关系的研究

近年来老年人的身体健康现状日益成为人们关注的焦点问题之一,为了对退休老年人的身体健康状况有进一步的了解,对58-68年龄段退休老年人进行身体形态和力量素质的测试。研究发现身高与握力（r=0.659）、体重和握力（r=0.655）均有显著相关性,且呈正相关趋势,身高与体重（r=-0.243）呈负相关。因此在适度原则下,应加强以力量素质为主的体育锻炼,其对于提高身体素质,增进健康有非常重要的意义。     

科技创新与服务外包产业升级的关联弹性研究 ——基于创新城市与服务外包示范城市的数据分析

服务外包产业升级是以高科技、高附加值的高端服务及研发环节转移为主要特征的全球产业结构升级的必然趋势。基于服务外包产业知识密集型的产业特点,本文从科技创新的视角,选取全国服务外包示范城市与创新城市的交叉样本作为研究对象,通过主成分分析法以及逐步回归法确定了影响服务外包产业升级的重要科技创新因素,包括企业R&D经费支出占产品销售收入比重和人均GDP,具有潜在驱动倾向的科技创新因素包括大专院校在校学生数、专业技术人员占就业人员比重、R&D经费支出与GDP比例等。在此基础上,本文通过构建回归方程,计算分析自变量的弹性灵敏度指数,根据计算结果提出应从挖掘专业人才潜力、增加科技投入强度等方面推动服务外包产业的升级。     

Typologies of Banner Advertisements’ Attributes: A Content Analysis

The web has received significant amount of attention from advertising and consumer researchers investigating the impact of banner advertisement on consumers’ psychological and behavioral responses. However, no typology of banner advertisement has been identified yet, and the selection of banner advertisements as advertising stimuli has been carried out on the premise of personal judgment rather than scientific methodology. The identification of typology is important because different banner advertisement, such as static and pop-up, elicit different consumers’ responses. In addition the identification of a typology constitutes an advance to mid-range theory in a research domain. Hence, the purpose of this research is to identify the typologies of banner advertisements’ attributes such as type, number, shape, location, and size using content analysis. Specifically, nine banner advertisement types are identified as well as the typology of number, shape, location, and size of banner advertisements. Contributions of the research are discussed.