小议沥青路面抗滑性能

本文论述了有关沥青路面的抗滑机理,影响抗滑性能因素、及抗滑性能评价模型等.为路面抗滑性能的研究提供一个参考.     

提高水泥混凝土路而抗滑构造质量初探

通过介绍水泥混凝士路面抗滑构造的施工方法,提出在水泥混凝士路面施工过程中过严格把好原材料关,合理选择施工机具,精心施工和管理是提高水泥浸凝士路面抗滑构造质量的有效途径.     

双层微表处在连霍高速公路商丘段修复车辙的应用

介绍了连霍高速公路商丘段双县微表处的混合料设计、施工技术和使用情况.通车一年的使用情况表明,双层微表处修复车辙效果良好,与原路面粘结牢固,并在一定程度上提高了路面的抗滑和防水性能,可有效修复高速公路沥青路面的早期病害.     

改性沥青材料在路桥工程中的应用

沥青混凝土以其自身诸多的优点被广泛应用于公路路面施工当中。然而,沥青混凝土的离析问题却一直困扰着施工人员。与此同时,车辆的增多及交通荷载的增大,都对公路路面的性能提出了更高要求。改性沥青材料有其诸多的优点,对提高路面的防水性能、抗滑性能、平整陛能、耐磨性能、提高路况质量,延长路面的使用周期都具有十分重要的作用。鉴于此,本文分析了路桥工程中改性沥青施工技术要点,对改性沥青在路桥工程中的应用进行了论述。     

sbs改性沥青路面施工工艺及质量控制

道路工程中,对沥青混凝土路面的性能要求是,必须具有足够的强度、稳定性、平整度、抗滑性和尽可能低的扬尘性.随着我国交通运输业的飞速发展,交通量及车辆大型化、重载超载车的比例不断增加,高温车辙、低温脆裂等病害严重影响着沥青混凝土路面的使用质量.     

浅谈稀浆罩面技术

稀浆罩面技术作为一种应用广泛的预防性养护手段,能够有效预防路面病害的进一步扩展,特别在处理路面早期病害上,可以迅速修复路面,填补车辙,提高路面的平整度、防水性和抗滑性.     

试析水泥砼路面抗折强度的影响因素

水泥砼路面由于直接受车辆荷载的重复作用及环境因素(如温度、湿度)的影响,因而对砼板要求具有较高的抗折强度、耐久性、耐磨性和抗滑性.其中抗折强度是砼路面的一项重要控制指标,其大小是否满足设计要求,将直接影响到路面的整体质量及使用寿命.     

浅谈混凝土路面面层接缝、抗滑与养生

为适应公路建设和交通运输发展的需要,提高我国公路水泥混凝土路面工程的施工技术水平,保证其施工质量,本文从混凝土路面面层接缝、抗滑与养生三个方面进行了详细的阐述.     

浅谈影响高速公路沥青路面平整度的原因

在高速公路建设中由于沥青路面具有表面平整、行车舒适、耐磨抗滑、低噪声、施工周期短、维修简便等特点,而被广泛应用.驾乘人员在高速公路上行驶的第一感觉便是路面的平整度,因此,路面平整度是体现路面质量与行车舒适性的最直接指标.     

高速公路沥青路面施工控制

高速公路能否发挥其应有的作用,很大程度取决路面面层质量.优质路面不但要求有足够的强度、稳定度、平整度,又要兼顾高温稳定性、低温抗裂性、水稳定、抗滑性和永久性等相互制约或矛盾的要求.     

一种咬尾双二进制Turbo码并行译码方案

针对双二进制Turbo译码使用并行、滑动窗联合译码技术时，其咬尾的编码构造和窗分割导致边界状态值难以获取的问题，提出了一种新咬尾Turbo码并行、滑动窗译码方案——扩展交叠方案。该方案采用了边界状态盲估计和滑动窗状态回溯两种新译码技术。相比于传统的边界状态度量传播方法（又称迭代法），新方法一方面提高了边界状态度量的准确性，从而加快了译码收敛速度，一定程度上减小了高信噪比下的性能损失；另一方面避免了存储前一次译码的迭代度量值，更有利于硬件设计。仿真表明，新方案在64左右的中等窗长下即可消除并行和滑动窗影响，逼近原始无并行无滑动窗译码的性能，且窗长越小，其相较传统迭代法带来的译码性能增益就越明显。该方案具有较好的实用性和应用价值，可以满足5G的高速率、低时延和低存储的数据传输要求。     

一种低复杂度的降低MIMO—OFDM峰平比的CARI方法

天线旋转取反算法(CARI)是降低MIMO-OFDM系统峰平功率比(PAPR)的一种性能较优的算法,不足之处是其迭代次数很大。CARI的次最优算法逐次次最优天线旋转取反(SS-CARI)算法虽然可以减小迭代次数,但性能损失又比较大。针对这一问题,提出了一种用滑动窗搜索旋转取反组合的次最优CARI方法,利用滑动窗搜索局部最优的旋转取反组合,既可以避免整体的遍历搜索大大减小CARI算法的计算复杂度,又可以改善SS-CARI的PAPR减小性能。仿真结果表明,该方法能够在系统复杂度与PAPR降低性能上取得很好的折衷。     

Self‐Financing Trading Strategies for Sliding, Rolling‐Horizon, and Consol Bonds

The time evolution of a sliding bond is studied in discrete‐ and continuous‐time setups. By definition, a sliding bond represents the price process of a discount bond with a fixed time to maturity. Examples of measure‐valued trading strategies (introduced by Bj"ork et al. 1997a, 1997b) which are based on the price process of a sliding bond are discussed. In particular, a self‐financing strategy that involves holding at any time one unit of a sliding bond is examined (the wealth process of this strategy is referred to as the rolling‐horizon bond). In contrast to the sliding bond, which does not represent a tradable security, the rolling‐horizon bond (or the rolling‐consol bond) may play the role of a fixed‐income security with infinite lifespan in portfolio management problems.     

Why sales reps should welcome information technology: Measuring the impact of CRM-based IT on sales effectiveness

This study seeks to answer the following question: Can sales representatives enhance their performance through their acceptance of information technology (IT) tools? Using data collected from two companies, we show that despite uncertain results and the frequent resistance among salespeople to IT interventions, IT acceptance indeed has a positive effect on sales performance. This occurs because salespeople using IT expand their knowledge and, in turn, gain improved targeting abilities, enhanced presentation skills, and increased call productivity. Thus, sales representatives have a strong incentive to accept IT because doing so is likely to sharpen their own job performance.     

Individual pay for performance in Spain: Cognitive sociology and the subsidiary insider perspective

This article examines how individual pay for performance is interpreted, predominantly by nonmanagerial employees, within the European context, at three subsidiaries of one U.S. multinational corporation in Spain. The study reveals how two levels of the cognitive socialization process color the lens through which employees view pay for performance and reveals how subsidiary founding, politics of resistance, and host‐country effects impact the implementation of the practice. Contrary to past studies in the literature, the study discovered a large number of nonmanagerial employees with a positive interpretation of pay for performance due to the influence of pre‐existing organizational cultural experiences. © 2010 Wiley Periodicals, Inc.     

Global economy in the doldrums

The USA and Japan have been in recession since last spring, and the events of September 11 have further intensified the global downturn. How quickly can the USA s keenly expansive economic policy succeed in overcoming the paralysing effects of the terrorist attacks? Is the euro area sliding into recession or will we soon see a return to economic expansion here?     

An Overview of the Electronic Information Industry in 2008

With European, American and Japanese economies still in recession, external demand remaining weak, total revenues of China＇s electronic information industry witnessed a decline in the first four months of 2009, sliding 2.2 percent year-on-year, according to statistics released by China＇s Ministry of Industry and Information Technology on May 22.     

一种改进的民用GPS异步欺骗技术

针对民用全球定位系统(Global Positioning System,GPS)欺骗中存在的欺骗信号伪码相位同步问题,通过欺骗建模分析得到了主要误差来源于探测系统定位精度。基于传统单路滑动牵引入锁技术,理论分析了功率损失主要来源于载波偏差。针对工程应用中欺骗信号构造时初始码相位超前滞后的不确定带来的欺骗起效时间二值性,提出基于码片误差滞后扩展处理的改进技术,并利用多路并发滑动优化单路滑动时间过长问题。通过软件接收机、商用接收机实验验证了改进的滑动入锁技术在实际应用中具有欺骗起效时间短、欺骗更可靠的特点。该研究成果可为民用GPS欺骗技术研究人员提供参考。     

滑移装载机在粮食仓储中的应用

本文介绍了一种滑移装载机,机动灵活,可实现无人驾驶。     

A study of the effects of repeated commercial launderings on the performance of 50/50 polyester/cotton momie cloth

Samples of brown 50% polyester/50% cotton momie cloth with a fluorocarbon finish were commercially laundered using a carbonate-built detergent in soft (0 ppm) water. The appearance of the laundered samples was assessed by subjective pilling ratings and instrumental colour determinations; the performance properties examined were tear and tensile strength, abrasion resistance and ability to release oil. The results showed that pilling was at its maximum after 20 launderings. The depth of colour decreased with increased number of cycles and, in most cases, was not accompanied by change of hue Tear and tensile strength were not affected by the laundering process. The fluorocarbon finish on the unlaundered control increased the weight loss due to Accelerator abrasion, thus that due to repeated launderings was significantly less. The finish protected the fibres from flex abrasion, increasing the number of cycles required to rupture the fabric and only the sample laundered 60 times had significantly greater resistance. The ability to release oil decreased with increased number of launderings. Oil remaining in the fabric was located in the interstices between yarns.