Water technologies and the environment: Ramping up by scaling down

The world is facing a global water crisis. Already, deficiencies in water supply and water quality are causing widespread human suffering. About 1.1 billion people lack access to clean water, and 2.6 billion do not have access to improved sanitation facilities. Everyday, 4500 children throughout the world die from preventable diseases caused by the lack of clean water and sanitation. China, India, and the United States are all facing major shortages of freshwater, and water pollution is having serious impacts on public health and the environment in both China and India. Major investments in science and technology will be required to address the water issues of the future. A new generation of innovative, small-scale technologies is needed to prevent and control pollution, and to restore watersheds. Creative, collaborative approaches to addressing the world's decline in freshwater resources are urgently needed.     

破解铸造企业用工荒的一些思考与措施

面对现阶段愈演愈烈的用工荒,从宏观与微观两方面分析了用工荒产生的成因、特点、分布,利用人力资源管理理论,阐述了一些企业用工方面存在的典型问题以及用工误区,提出了一些建设性的意见与措施。     

Anti‐corrosion additive for concrete

The Building Research Institute in Warsaw has developed an organic concrete additive, known as Dikszopt, which is derived from tanning oak extract. Tests, mostly in the laboratory but some in application trials, show that it has a remarkable ability to protect reinforcing steel against corrosion, notably in carbonized concrete. It also appears to improve the consistency of the concrete mix and retard the setting time, as discussed in this article from the Institute.     

Occupational exposure to noise and the cardiovascular system: A meta-analysis

The aim of our meta-analysis is to evaluate the association between the modifications of the cardiovascular system and chronic exposure to noise in occupationally exposed subjects.We considered the articles published from 1950 to May 2008. Only 15 papers were conforming to the inclusion criteria identified for this meta-analysis. A total of 18,658 workers were divided in three groups according to the level of noise exposure as measured in the original studies (High Exposure, HE, Intermediate Exposure, IE, Low Exposure, LE). A preliminary evaluation of the type of data allowed for a classification of the type of performed measurements. Two classes of variables were identified: Class I, composed by continuous variables (systolic blood pressure, SBP, diastolic blood pressure, DBP, and heart rate, HR) and Class II, composed by not continuous variables (prevalence of hypertension and prevalence of ECG abnormalities). For each variable the calculation of heterogeneity was performed. For continuous variables the calculation of ES and its significance were performed while Odds Ratio (OR) and its significance were calculated for not continuous variables.The results show a statistically significant increase of SBP and DBP in HE workers compared to LE and IE workers while HR is statistically higher in HE participants compared to LE participants. The prevalence of both hypertension and ECG abnormalities is statistically higher in HE workers compared to LE and IE workers.Taking into account both the extremely high heterogeneity among studies and the ES/OR values we suggest a particular attention to the measurement and evaluation of SBP, DBP and HR in workers with chronic exposure to noise. Also ECG for workers with chronic exposure to noise is suggested in order to identify and evaluate possible abnormalities noise could be a concurrent cause of.     

433MHz物联网开发平台的设计与开发

物联网是当前信息领域中研究的热点。本文以CC1110芯片为核心,利用温湿度、烟雾、亮度等传感器结合自主开发的WIA-PA协议栈软件,研制了一种基于433MHz频段的物联网开发平台。利用该平台提供的开发套件,可方便地开发智能家居、环境监测等应用系统。目前,重庆伟岸测器利用本平台已成功开发了无线热能表系统。     

Re-engineering the tender code for construction works

The UK's NJCC Code of Procedure for Single Stage Selective Tendering (now withdrawn) and its successor, the CIB's Code of Practice for the Selection of Main Contractors are criticized in the light of decisions of the common law courts with regard to regulation of the tendering process. It is argued that a new ‘Tendering Code’ should be produced in the style and format of a contract document which reflects not only the statutory regulation imposed on public bodies, but common law decisions of the courts. The nature of this tendering contract is explained as a means of regulating the tendering process. Issues discussed are: dealing with errors and irregularities found in tenders; dealing with non-compliant tenders; dealing with tender withdrawal prior to its acceptance or rejection; making provisions as to time for submission of tenders and dealing with late tenders; making provision for submission of tender by fax or other electronic means; making provision for evaluation of tenders received; and imposing or negotiating reductions in price with tenderers prior to acceptance. The paper concludes that the common law obligations placed on the owner to treat all tenderers equally and fairly and to apply the tender conditions when evaluating tenders and awarding contracts seems to be good common sense and of commercial advantage, not only to the immediate parties concerned but also to the wider community.     

日常生活视角下城市慢行交通系统规划探讨--以呼和浩特市一环核心区慢行交通系统规划为例

新型城镇化背景下城乡规划视角需要回归真实的日常生活,作为市民日常生活基本组成的慢行交通应该在城市中享有优先权。结合呼和浩特一环核心区慢行交通系统规划实践,尝试性探讨日常生活视角下慢行交通系统规划的方法与策略,认为在方法上需要注重个体空间体验和公众参与,在规划策略上要建立密网渗透、环境宜人有特色、衔接高效的慢行交通系统。     

浅埋深综放工作面过冲刷带时支架-围岩相互作用关系研究

 摘要：神东保德矿81304工作面过地表冲刷带时出现工作面液压支架被压死事件。本文根据工作面地质条件及现场情况,运用“支架-围岩”相互关系推演了支架被压死的过程,分析地质变化因素对“压架”事件的影响,建立综放工作面围岩-支架稳定性力学模型。通过分析可知,当综放工作面支架支护强度不足时,支架支护效率会急剧下降;工作面上覆基岩厚度陡增40m是导致保德矿支架被压死的主要因素。     

软件自动化测试方案的效益分析

首先对手工测试与自动化测试进行比较,然后提出自动化测试方案选择需要考虑的方面,并结合工作实践,给出了一种自动化测试投资回报率的计算方法,论述了自动化测试带来的效益,并指出自动化测试的引入应当选择合适的时机,实现手工测试和自动化测试实现完美结合。     

模块递阶式教学在景观设计课程中的应用——以大连理工大学环境设计专业为例

通过对模块教学概念、发展现状和基本特性的分析,阐述在景观设计课程中应用模块教学模式的重要性及现实意义,并以大连理工大学环境设计专业的景观设计课程为例,详细论述根据教学内容开创的"1+2+3+N"的模块递阶式教学模块,旨在提高学生学习的自主能力及培养进行景观设计的基本技能和创新精神。