Italian multicentre study on microbial environmental contamination in dental clinics: a pilot study

The dental practice is associated with a high risk of infections, both for patients and healthcare operators, and the environment may play an important role in the transmission of infectious diseases. A microbiological environmental investigation was carried out in six dental clinics as a pilot study for a larger multicentre study that will be performed by the Italian SItI (Society of Hygiene, Preventive Medicine and Public Health) working group "Hygiene in Dentistry". Microbial contamination of water, air and surfaces was assessed in each clinic during the five working days of the week, before and during treatments. Air and surfaces were also examined at the end of the daily activity. A wide variation was found in microbial environmental contamination, both within the participating clinics and relative to the different sampling times. Microbial water contamination in Dental Unit Water Systems (DUWS) reached values of up to 26 × 10⁴ cfu/mL (colony forming units per millilitre). P. aeruginosa was found in 33% of the sampled DUWS and Legionella spp. in 50%. A significant decrease in the Total Viable Count (TVC) was recorded during the activity. Microbial air contamination showed the highest levels during dental treatments and tended to decrease at the end of the working activity (p < 0.05). Microbial buildup on surfaces increased significantly during the working hours. As these findings point out, research on microbial environmental contamination and the related risk factors in dental clinics should be expanded and should also be based on larger collections of data, in order to provide the essential knowledge aimed at targeted preventive interventions.     

Review on smart home energy management

Presently, the increasing demand for the smart home system has necessitated a holistic approach to the problem and the need for a complete literature review. This paper discusses about the necessity for a smart home and developed an idea of the smart home energy management system with the literature review related to the energy management system scheduling, control, real-time automation, and communication.     

格栅式消能池应用于山地城市排水系统

山地城市的地形坡度较大,排水管道系统的上、下端落差大,因而需设置大量的跌水、消能构筑物,为此,在城市排水管道工程设计中引入了在水利工程上常用的格栅式消能池工艺,并介绍了格栅式消能池的工艺构造、消能机理及设计计算方法。     

新型双污泥脱氮除磷工艺处理生活污水

将活性污泥法与生物膜法相结合，开发出一种新型脱氮除磷处理工艺，成功地解决了传统工艺中硝化细菌与除磷菌之间的泥龄矛盾问题。试验结果表明，该工艺对COD、NH3-N、TP的去除率分别高达85％、95％、90％，同时处理效果稳定，对水质的适应能力也较强。     

State of the practice review of heap leach pad design issues

The authors present a summary of the state of the practice of containment design in copper and gold heap leaching, focusing on recent advancements and how these applications differ from the more conventional landfill design practices. Advancements both within the Americas and worldwide are presented, including consideration of increasing heap depths, which are now approaching 150 m (with ore densities generally in the range of 1500–1800 kg/m³). Liner system performance under these pressures will be reviewed, including the latest developments in drainage pipe performance testing. The authors will also explore the recently emerging technology of using concentrated sulfuric acid pre-curing for copper ores and the related compatibility issues with conventional geomembrane materials.     

有机载热体供热系统在刨花板生产线改造中的应用

本文以实际设计为基础，介绍了有机载热体（导热油）供热系统在刨花板生产线改造中，在热压机以及采用热油式热交换器换成热风和回收油炉烟气余热补充干燥刨花中的应用，运行效果均良好。达到节能、降耗、增产目的，经济效益显著。     

嘉华嘉陵江大桥弱电系统设计

我国的城市大型桥梁及隧道正处在起步发展的阶段,由于这些领域的弱电控制系统具有一定的复杂性、特殊性,故在确定弱电方案时必须充分考虑大型桥梁、隧道等工程长距离、大范围、设备分散性、控制复杂等特点。     

深圳彭年酒店空调设计

彭年酒店按五星级标准设计，分为酒店和办公部分。空调系统划分为4个独立的子系统，空调水系统为一次泵变水量系统，双管制。为解决过渡季节客房需供暖，裙房、地下室需供冷的问题，在管路中增加了客房独立供暖旁路。介绍了该工程的空调设计、空调系统形式、自控方式、空调主要设计参数及运行情况和设计体会。     

武汉三金潭卵形消化池新施工方法

介绍了一种大型卵形消化池的新施工方法,不采用脚手架支撑,而采用自立组合框架模板体系、后嵌入式模板,并辅以中心塔、辐射梁的定位支撑整体系统;并概要介绍了该施工系统设计分析要点。     

优劣系数法在EPS外保温系统选择中的应用

本文运用优劣系数法,对几种常用的EPS外保温系统在保温效果、造价等方面进行了比较,从而选出较经济合理、功能满意的EPS外保温系统,为EPS外保温系统的选择和推广提供了有益的参考。