新农村建设的生态之路

新农村建设是党中央提出的伟大正确决策,解决好"三农"问题将有利于我国建立和谐发展的新局面。然而在推动农村经济发展的过程中,生态环境的保护变得越来越重要,农村生态环境的破坏已成为制约我国农村经济健康发展的因素之一。本文概述了保护农村生态环境的意义及农村生态环境现状,同时对农村如何在保护生态的基础上发展经济提出相应的对策。     

Safety concerns related to modular/prefabricated building construction

The US construction industry annually experiences a relatively high rate of fatalities and injuries; therefore, improving safety practices should be considered a top priority for this industry. Modular/prefabricated building construction is a construction strategy that involves manufacturing of the whole building or some of its components off-site. This research focuses on the safety performance of the modular/prefabricated building construction sector during both manufacturing and on-site processes. This safety evaluation can serve as the starting point for improving the safety performance of this sector. Research was conducted based on Occupational Safety and Health Administration investigated accidents. The study found 125 accidents related to modular/prefabricated building construction. The details of each accident were closely examined to identify the types of injury and underlying causes. Out of 125 accidents, there were 48 fatalities (38.4%), 63 hospitalized injuries (50.4%), and 14 non-hospitalized injuries (11.2%). It was found that, the most common type of injury in modular/prefabricated construction was ‘fracture’, and the most common cause of accidents was ‘fall’. The most frequent cause of cause (underlying and root cause) was ‘unstable structure’. In this research, the accidents were also examined in terms of corresponding location, occupation, equipment as well as activities during which the accidents occurred. For improving safety records of the modular/prefabricated construction sector, this study recommends that future research be conducted on stabilizing structures during their lifting, storing, and permanent installation, securing fall protection systems during on-site assembly of components while working from heights, and developing training programmes and standards focused on modular/prefabricated construction.     

Injuries and their burden in insured construction workers in Iran, 2012

The present study used disability adjusted life years (DALY) to estimate the burden of external cause of injuries in construction workers insured in Iran in 2012. The Global Burden of Disease method (2010) was used to estimate the years of life lost due to death (YLL) and years of life lost due to disability (YLD). DALY was calculated as the sum of YLL and YLD. There were 5352 injured construction workers in Iran (11.25 individuals per 1000). Falling was the most common incidence and included 2490 individuals (46.53%). Totally, DALY was estimated 18,557 years for all age groups and both genders including 17,821 YLD (96%) and 736 YLL (4%). The DALY related to construction work is high in Iran and it has notably affected the young. Hence more preventive methods should be applied to reduce the overall burden of specific external cause of injuries especially in young and inexperienced workers.     

一种稀疏重建的多基地雷达多目标定位算法

采用距离和信息的多基地雷达多目标投影定位算法中,距离向脉冲压缩后分辨率降低,需要已知空间中目标个数。针对此问题,提出了一种稀疏重建的多基地雷达多目标定位方法。该方法利用多个接收机中目标稀疏度相同的特点,通过构造平均重构残余误差变化率和平均散射系数变化率作为正交匹配追踪(OMP)算法迭代终止判定条件,自适应地终止OMP算法的同时获得稀疏重建信号以及信号稀疏度的估计值,提高了距离向分辨率,获得了对空间中目标个数的估计。仿真实验表明所提算法有效抑制了距离向主瓣展宽和旁瓣串扰,提高了距离向分辨率。同时,所提算法在不同噪声环境下能准确估计空间中目标个数并提取其空间位置,实现对空间中目标的准确定位。     

Perceived Project Value,Opportunistic Behavior,Interorganizational Cooperation,and Contractor Performance

Predictors of contractor performance have attracted the attention of researchers in the developed world. However, research from sub-Saharan Africa to corroborate these findings has remained sparse. What exists is speculative and at best anecdotal. Using data from construction firms in Uganda, this study finds that commitment to the project, perceived value of the project, interorganizational cooperation, and opportunistic behavior are significant predictors of contractor performance. This has both policy and managerial implications, which we present in this paper.     

国内外电力建设工程质量监督管理模式的比较分析

文章在我国电力工程质量监督体系调整的背景下。介绍了我国电力建设工程质量监督管理的组织机构和监管程序。并以美国和英国为代表．分析其电力工程质监的组织机构设置与发电许可证申请程序,总结了国外电力工程监管的经验和特征,提出了加强和完善我国电力建设工程质量监督管理的建议,以促进我国电力工程质量监管水平的提高。     

The British Airways Heritage Collection: an ethnographic ‘history’

This article develops an ethnographic account of the development and history of the British Airways Heritage Centre (BAHC). Responding to several observations throughout the literature, we report on our experiences of engagement with British Airways’ archives over a 25-year period. In doing so our focus is on the much-neglected history of archives as powerful influences on how corporate histories are written. The ethnographic account is rooted in ANTi-History, an approach to historiography, that focuses on the production of history as knowledge of the past by following a number of human (e.g. archive volunteers) and non-human (e.g. airline artefacts) actors to reassemble the elements that constitute an archive at a point in time. To that end, we trace the inter-relationships between histories of British Airways and the development of the BAHC. We conclude that a focus on the various human and non-human relationships that constitute an archive can help the researcher to identify the hidden influences on the production of history that can otherwise serve to enrol him or her.     

利用ACE值构造QC-LDPC码

为进一步提升中短码长下准循环低密度奇偶校验(Quasi-cyclic Low-density Parity-check,QC-LDPC) 码的纠错性能,提出了一种综合短环数目和环连通性的QC-LDPC码构造方法。首先,采用Golomb规则构造QC-LDPC码,对基矩阵中的部分元素进行替换预处理,初步降低短环数目;其次,采用所提的利用近似环外信息度（Approximate Cycle Extrinsic message degree,ACE）的消环掩模算法来优化QC-LDPC码,使得掩模后的校验矩阵具有较大的ACE平均值,最终完成QC-LDPC码的构造。该构造方法简单、通用性强,在短环数目和连通性间进行了平衡。与只考虑减少短环数目、增大围长等方法相比,该方法构造的QC-LDPC码有更加优异的纠错性能。     

“双高计划”呼唤高职院校补齐教师队伍建设短板

教师是兴教之本、立教之源,是实施"双高计划"建设最重要、最直接的力量。大力加强教师队伍建设是高职院校高质量发展的迫切要求。当前高职院校教师队伍存在总量不足、高层次人才短缺、双师素质不高、创新能力不强等问题,必须引育结合、创新机制、激发活力,补齐短板,提升整体实力和水平。