GE Sensing中标新疆独山子石化项目

在2006年8月，2007年2月与3月，世界领先的专业提供先进测量和传感技术解决方案的厂商GE Sensing，相继赢得了中国迄今最大的石油化工项目——新疆独山子项目中的超声波流量计、微量水分析仪和微量氧分析仪的合同。     

OXYMAT6E型氧分析仪的应用

文章阐述了OXYMAT6E型氧分析仪的工作原理和结构特点，以及它在PTA抑制和输送中的应用情况，并对目前氧分析系统提出改造方案。     

我国“八五”科技攻关重大成果微量氧分析器

我国“八五”科技攻关重大成果微量氧分析器四川仪表九厂研制的微量氧分析器是采用化学反应的原理进行微量氧分析的。仪器的测量元件是采用技术先进的三电极结构的原电池。仪器备有电解氧装置，可方便地进行校准；备有自动加水装置，减少了日常维护工作量；传送器内自动恒...     

磁力机械式氧分析仪预处理系统的改进

在监测焦炉煤气氧含量的磁力机械式氧分析仪系统中，采样预处理系统是一个重要环节。在介绍磁力机械式氧分析仪的工作原理和采样预处理系统结构的基础上，结合现场实际，分析了采样预处理系统存在的问题，提出了相应的改进措施，经实施后收到了良好的效果，分析仪运行稳定、测量准确，过滤纸和分析仪测量室的寿命延长。     

溶解氧对氧分析仪测量精度的影响及消除方法

上海宝钢化工有限公司在焦炉煤气主管道上共装有2台氧分析仪，负责监控煤气中的氧气含量，保证煤气中的氧气含量小于1VOL％，对公司的安全生产起到重要作用。     

磁氧分析仪在喷煤制粉系统中的应用与研究

为降低无烟煤的用量,现代化高炉喷煤都以喷吹大量的烟煤为目标.但是烟煤制粉过程中过高的O2含量会导致爆炸现象的发生,为此必须采用更为可靠的设备和手段来检测O2浓度.通过对磁氧分析仪的工作原理、控制系统结构及各组成环节的控制功能的阐述,介绍了其在生产中的实际应用情况,并分析了磁氧分析仪的日常维护和常见故障排除.实际应用表明,磁氧分析仪为制粉系统的安全运行提供了保障.     

智能型氧量分析仪的设计

本文分析了氧化锆的测氧原理，介绍了智能型氧量分析仪的软、硬件组成，并提供了分析仪的电路原理图。文章对如何采用软件方法提高分析仪的测量精度进行了详细阐述。该智能型氧量分析仪经过现场安装测试，具有精度高、可靠性好、工作稳定、成本低、调试方便等特点，具有广阔的应用前景。     

防爆型2100C过程总有机碳分析仪在水中油监测的应用

论述了2100C过程总有机碳分析仪紫外催化与化学动力氧化，载气抽提，非色散红外分析流程的工作原理和基本结构，给出了防爆区域循环冷却水中微量油泄漏连续监测的典型应用。     

基于氧传感器微弱信号处理电路的设计与分析

氧气浓度检测是当前气体检测的重点领域,氧传感器信号处理属于微弱信号处理,针对氧传感器探测器出来的微弱信号进行分析,设计改进了一款微弱信号处理电路,经过严格的参数计算、逐级精密放大和滤波,经过仿真测试,电路具有很高的信噪比,实现了微弱信号的精密放大。最后进行了两级测试,首先测试了微弱信号处理电路在氧传感器中的应用,测试误差小,再将此氧传感器应用于氧分析仪中,经过测试,氧分析仪线性误差小于±3%RS,一天的漂移误差约为±2 FS。验证了处理电路的正确性和有效性。     

DD-10型电导式微量Co、Co_2分析仪的故障检查与分析

DD-10型电导式微量CO、CO_2分析仪广泛应用于化工、化肥等工厂中。本文作者即根据自己在实际工作中的体会,比较详细地介绍了这种分析仪各组成部分的故障检查、分析及处理方法。     

The energy demands of portable gas analysis system carriage during walking and running

The aim of this study was to evaluate the carriage of a portable gas analyser during prolonged treadmill exercise at a variety of speeds. Ten male participants completed six trials at different speeds (4, 8 and 12 km h^? 1) for 40 min whilst wearing the analyser (P) or where the analyser was externally supported (L). Throughout each trial, respiratory gases, heart rate (HR), perceptions of effort and energy expenditure (EE) were measured. Significantly higher EE occurred during P12 (p = 0.01) than during L12 (855.3 ± 104.3; CI = 780.7–930.0 and 801.5 ± 82.2 kcal; CI = 742.7–860.3 kcal, respectively), but not at the other speeds; despite this, perceptions of effort and HR responses were unaffected. This additional EE is likely caused by alterations to posture which increase oxygen demand. The use of such systems is unlikely to affect low-intensity tasks, but researchers should use caution when interpreting data, particularly when exercise duration exceeds 30 min and laboratory-based analysers should be used where possible.     

激光在线测氧仪与电捕焦油器联锁控制的开发与应用

介绍激光在线测氧仪、电捕焦油器的选型与应用,以及在集散控制系统中实现氧含量的实时检测、电捕焦油器远程控制、与氧含量信号的联锁控制.     

Limitations on the use of perovskite-structure oxides in gas sensing as a result of the concurrent operation of separate mechanisms

This paper addresses the consequences of operating a semiconducting oxide gas sensor with appreciable oxygen ion mobility within a temperature range where equilibration of the bulk oxygen content and surface reactions with reducing gases can proceed simultaneously. The investigations focus on the behaviour of an example of a perovskite material (LaFe_0.95W_0.05O₃) stemming from standard perovskites, but having all alkaline ions substituted by rare earth, on its resistance and stability against sulfur-containing gases (H₂S) and on its sensitivity towards some important reducing gases (carbon monoxide, ethanol, methane, propane). The experimental results provide responses to these latter four gases which are distorted by the superimposition of responses involving bulk oxygen equilibration upon the surface reactions with reducing gases. It is concluded that, although perovskite-structure oxides remain useful for oxygen monitoring at high temperature, their deployment for sensing reducing gases is problematical.     

Deep UV based DOAS system for the monitoring of nitric oxide using ratiometric separation techniques

The investigation of an ultra violet DOAS (differential optical absorption spectroscopy) sensor based on fibre-optic technology for the monitoring of nitric oxide gas in an exhaust environment is described. Cross-sensitivity issues with other gases present in the environment were realised and ratiometric separation techniques were developed in order to reduce the sensor's susceptibility to these interferences. Experimental results describing the calibration of the sensor against a commercial analyser and tests documenting the sensor's operating capabilities within the exhaust of an engine are presented. The lower limit of detection for the sensor was found to be 5 ppm with response times of 3.4 s.     

海量自动气象站分钟数据存储检索系统设计

地面自动气象站的时空密度不断增加,产生的观测数据量呈指数级增长,传统的关系型数据库在海量数据存储与检索方面存在能力不足、检索性能下降等问题。鉴于此,本文设计一种自动站分钟数据存储与检索系统。使用Quartz定时采集自动站分钟文件并解码入库;应用HBase分布式数据库建立分钟数据存储模型;针对多要素查询需求,应用Elasticsearch建立辅助索引,实现HBase的二级索引。系统测试结果表明,分钟数据入库平均耗时54.6 s,二级索引完整可靠,数据检索结果返回时效达到毫秒级,能够满足业务应用中对自动站分钟数据存储和检索时效的要求。     

氧化镍氧传感器的研究

NiO是一种由金属缺位而形成的P型半导体,在较高的温度下(600℃以上),NiO材料的电阻率与氧分压有关,而且杂质对其性能影响很大。掺入一价杂质(Li_2O),材料电阻率降低,氧分压对其影响减弱;掺入三价杂质(Al_2O_3),材料电阻率增高,氧分压对其影响加强。据此,我们做出了直热式烧结型氧传感器,并将其用于气相色谱仪中,测量高纯气体(N_2,Ar)中微量氧,还制备了 Ni_(1-x)MgO_x材料的氧传感器,降低了还原性气体对测氧的干扰。     

The effects of temperature, relative humidity and reducing gases on the ultraviolet response of ZnO based film bulk acoustic-wave resonator

This study investigated the influence of temperature, relative humidity and reducing gases on the ultraviolet (UV) response of ZnO based film bulk acoustic-wave resonator (FBAR). As temperature increased, the UV response of the FBAR degraded. This was attributed to the softening of the ZnO film with increasing temperature. Water molecules can replace adsorbed oxygen on the ZnO surface. At high relative humidity, more oxygen was replaced by water. In this way, the density of the ZnO film increased and less oxygen was left on the surface to be desorbed by UV, both of which contributed to a lower UV response. Reducing gases, such as acetone, can react with the surface adsorbed oxygen and reduce the density of the ZnO film, resulting in UV response degradation.     

Prediction of Harvard Pack Index from the result of an 11 min progressive exercise test and anthropometric measurements in coalminers

The Harvard pack test and an 11 min progressive treadmll test (belt speed 80m min^?1 incline increasing by l·4%min^?1 for 10min) have been applied to 378 healthy male mine rescue workers aged 20-45 yr. During the treadmill test measurements were made of ventilation, cardiac frequency and stroke volume. Measurements were also made of ventilatory capacity, body dimensions, fat free mass and heart volume

The results show that the Harvard pack index (HPI) may be predicted from the last minute cardiac frequency (LMfC) during the progressive treadmill test according' to the following relationship: HPI = 147?0·22 age?0·39 LMfC, the coefficient of variation about this relationship is 10·4%

The inclusion in the prediction relationship of fat free mass, cardiac frequency at an oxygen uptake of 67mmol min^?1 and stroke volume which in combination are significantly correlated with the HPI, also of leg length, ambient temperature and smoking history, which are not so related, do not materially improve the accuracy of the prediction. Current smoking is associated with a relatively low quantity of body fat and high ventilation minute volume during exercise but is not correlated with the exercise cardiac frequency. Evidence is presented why the submaximal cardiac frequency reflects the physical condition of the subjects.     

一种应用于隔爆试验装置中的新型自动配气系统

针对应用于隔爆试验装置中的传统配气方法存在配气速度慢、系统体积较大的问题,设计了一种基于质量流量法的自动配气系统。该系统采用质量流量控制器精确控制多种不同气体的流量,输出的多种气体经混合装置均匀混合后,由O2分析仪和H2分析仪实时监测混合气体的体积分数。测试结果表明,该配气系统配气速度快、结构简单,配制的多种气体体积分数精度能满足GB 3836.2—2010的要求。     

林木固碳释氧量预测的BP神经网络模型研究

为了实现林木固碳释氧量的数字化估算,针对现有估算方法的不足,提出了基于BP神经网络的林木固碳释氧量的预测模型。基于对神经网络理论和固碳释氧量估算模型的研究,分析了林木在生长季节的CO2通量变化趋势,采用规范化方法对训练样本预处理,进行BP神经网络训练,并结合弛豫涡旋积累法和箱式法,建立了CO2通量神经网络模型。实验结果表明,所建模型具有较好的泛化性能,能够比较准确地估算出林木的固碳释氧量。