气候与环境试验设备的特殊安全要求 （1）设备的分类、范围、试验与标志要求

气候与环境试验设备是十分重要的实验室设备之一,文章分类介绍了最新国家标准草案系列气候与环境试验设备的基本类别、范围、试验以及与GB4793.1的通用要求对照相比,设备在标志与文件,电击或电灼伤,机械危险,火焰从设备内向外蔓延,过高温,液体和液体压力的影响,辐射影响,包括激光源、声压力和超声压力,释放的气体、爆炸和内爆,化学和生物危险以及原器件等方面通常应考虑的特殊安全要求,他们将作为设备设计、制造、检验时确保产品安全性与可靠性的重要依据。该系列标准已经成功转化为IEC61010-1-012国际标准新项目草案。     

湿膜式填料直接蒸发冷却空调的节能效果

探讨湿膜式填料直接蒸发冷却空调在纺织厂应用的节能效果.以无锡某纺织厂织造车间240台喷气织机为例,分别采用传统喷水室与湿膜式填料直接蒸发冷却空调进行对比测试分析.结果表明:在基本相同的气候条件下处理的最大送风量为1.3×105 m3/h时,湿膜式填料直接蒸发冷却空调比传统喷水室节约占地面积39 m2,节省装机功率15.1kW～32.7kW,并提出了进一步的改进建议.认为:针对性地组合应用间接蒸发冷却技术可以实现更有效的节能效果.     

中央空调系统的能量分析

对风机盘管+新风系统（FC+OA）的中央空调系统进行了能量平衡分析。给出了中央空调系统的能量平衡模型和能量平衡方程,并对中央空调系统的各子系统进行了能量分析。依据中央空调系统的能量分析计算实例,给出了提高中央空调系统能量利用率的有效途径。     

铜山口矿难选伴生钼矿石小型试验研究

铜山口矿铜原矿伴生钼品位较高,而生产的铜精矿含钼品位低且波动大。因此通过小型试验研究,分析铜精矿含钼品位低的原因,并提出可行的优化指标措施,指导现场生产。     

Effect of conditioning method on direct methanol fuel cell performance

We investigated the effect of the conditioning methods on improving the direct methanol fuel cell (DMFC) performance. The DMFC performance after the conditioning was measured using a newly developed single cell having an Ag/Ag₂SO₄ reference electrode, which is not influenced by methanol. As a result, we succeeded in developing an original two-step conditioning method in which the conditioning by fueling H₂ gas is conducted prior to a conventional DMFC conditioning. The anode and cathode characteristics after the two-step conditioning were measured with respect to a reference electrode. Based on the obtained i-E curves, the two-step conditioning is found to improve the methanol oxidation performance at the anode and also suppress the decline of the O₂ reduction performance at the cathode. The high DMFC performance based on the two-step conditioning is well explained by the anode and cathode characteristics.     

压电传感器在动平衡测量系统中的设计与应用

传感器是动平衡测量系统中的重要元件之一,是一种将不平衡量产生的振动信号不失真地转变成电信号的装置.利用压电式力传感器作为动平衡测量系统中的敏感元件来测量不平衡质量引起的振动.重点阐述了该压电式力传感器的结构设计、安装位置设计及振动信号检测中的关键问题.同时,详细分析了该传感器的信号调理电路特点.现场实验结果表明,设计的压电式力传感器在动平衡测量中的性能良好.     

污泥化学调理研究现状

污泥调理作为污泥脱水过程的重要环节,对后续处理起着至关重要的作用,介绍了作为主要调理方法的化学调理原理及一些常用的化学调理剂,并对将来的研究方向进行了展望和概括。     

日本动燃团沥青固化示范工厂着火／爆炸事件分析及教训

本文介绍了日本动燃团沥青固化示范工厂着火／爆炸事件的过程,并讨论了事件发生的原因,提出了值得吸取的教训。     

Procedures for conditioning W- and Ni-moderators for application in positron-scattering measurements

We report recipes for the successful conditioning of tungsten and nickel moderators, for application in positron-scattering experiments. In addition, the comparative performance of those moderators, as a result of these procedures, is assessed.     

Improved solutions for ill-conditioned problems involved in set-membership estimation for fault detection and isolation

Set-membership (SM) estimation implies that the computed solution sets are guaranteed to contain all the feasible estimates consistent with the bounds specified in the model. Two issues often involved in the solution of SM estimation problems and their application to engineering case studies are considered in this paper. The first one is the estimation of derivatives from noisy signals, which in a bounded uncertainty framework means obtaining an enclosure by lower and upper bounds. In this paper, we improve existing methods for enclosing derivatives using Higher-Order Sliding Modes (HOSM) differentiators combining filtering. Our approach turns the use of high order derivatives more efficiently especially when the signal to differentiate has slow dynamics. The second issue of interest is solving linear interval equation systems, which is often an ill-conditioned problem. This problem is reformulated as a Constraint Satisfaction Problem and solved by the combination of the constraint propagation Forward Backward algorithm and the SIVIA algorithm. The two proposed methods are tested on illustrative examples. The two methods are then used in a fault detection and isolation algorithm based on SM parameter estimation that is applied to detect abnormal parameter values in a biological case study.