推广真空除氧技术 降低油田注汽锅炉能耗

油田稠油热采注汽锅炉的除氧系统先后经历了热力除氧、海绵铁除氧、真空膜式除氧、真空除氧等发展阶段,其中热力除氧和海绵铁除氧由于达不到节能环保要求逐渐被替换为真空除氧,本文介绍了真空除氧器在实际应用中的探索和尝试。     

我国气体氧分析仪的研究现状

本文介绍了我国气体氧分析仪的应用领域、分类,详细描述了电化学原理氧分析器（电化学氧测定仪、原电池氧测定仪、氧化锆氧分析仪）和顺磁式原理氧分析仪的组成、原理、技术参数（测量范围、响应时间、示值误差、零点漂移、量程漂移、重复性等）,并且结合当前市场上普遍使用的仪器分别对百分含量氧分析仪和微量氧分析仪的国内外发展现状进行了比较。     

机载制氧系统氧浓度测试技术研究

高性能战斗机上已广泛使用分子筛机载制氧系统。飞行中,机载制氧系统供给飞行员吸入气中的氧浓度可用来评价系统的产氧能力,以及是否满足高空呼吸生理要求。通过氧浓度检测装置,获得了实际飞行中的氧浓度,为机载制氧系统的飞行试验鉴定提供了依据。     

新型的氧传感器

最近日本电池株式会社应用铅电池及燃料电池技术成功地研制出一种新型的氧传感器。它是伏打电池式氧传感器的一种,使用了新组分的电解液,不仅弥补了以往氧传感器的不足,而且开拓了氧传感器的新的应用领域,如氧孵化器的氧浓度分析及麻醉时的     

工业锅炉除氧设备的计算机控制系统

本文介绍了工业锅炉除氧的必要性、除氧的现状、除氧的方法及其原理;并阐述了除氧设备的计算机控制系统,及DKNK多功能控制器的功能和特点。     

结构新颖的低位集成真空除氧设备

结构新颖的低位集成真空除氧设备黑龙江省机械制造学校赵志宽贺东伟锅炉给水中的氧对锅炉各主要部件及管道均有严重腐蚀，影响了锅炉的安全运行，为此国家标准规定凡蒸发量在２ｔ／ｈ以上的锅炉必须除氧。目前锅炉除氧的方法有热力除氧，普通真空除氧、解析除氧、化学除氧...     

ZP型除氧装置研究

阐述了水除氧的意义，介绍了ＺＰ型除氧装置的研制情况、除氧原理、试验结果和经济效益。     

车用氧传感器的使用与维护

简述了氧传感器的功能，构造、工作原理及其类型，分析了氧传感器的故障原因，指出了氧传感器的故障诊断与维修方法。     

国内变压吸附制氧技术的发展现状及应用创新

简述了国内外变压吸附制氧技术的发展,介绍了变压吸附制氧技术的特点和主要应用领域,对变压吸附制氧技术的发展做出了展望。     

转炉氧枪装置设计

通过对转炉氧枪装置设计过程介绍,分析了氧枪横移车、升降小车以及氧枪刮渣器设计中的要点,提出了针对氧枪装置在保证转炉炼钢生产过程的连续性、可靠性以及安全性和维护便利性等方面的一套全新的设计方案,使氧枪装置使用维护性能得到较大提高,所提到的新型结构氧枪已在多个转炉炼钢生产现场得到验证。     

固相微萃取和气相色谱-质谱法测定北京酱牛肉中的挥发性成分

采用顶空固相微萃取和气相色谱-质谱法（Head Space Solid Phase Microextraction Gas Chromatgraphy-Mass Spectrometry,HSSPME—GC—MS）对北京传统酱牛肉中的挥发性香气物质进行了测定,总共检测出68种风味化合物,其中包括醛类49.12%、酮类0.84%、醇类4.85%、烃类13.29%、酯类2.61%、酚醚类11.33%和含硫含氮及杂环化合物6.55%,另外还有11.41%的其它类物质,其中醛、酮和含硫含氮及杂环化合物中含有北京传统酱牛肉的主要香味成分。     

螺旋锥齿轮珩磨轮的制造方法

对用于螺旋锥齿轮珩磨加工的珩磨轮模具制造的关键技术进行深入研究。介绍珩磨轮齿面准均布网格点的计算方法,通过计算这些准均布网格点及其径矢和法矢,建立齿面上每一个网格点的拨模极限导程的数学模型。通过计算齿面上这些网格点的可行的螺旋线导程,判断其交集是否为空集,并以此作为判断是否出现拨模干涉的依据。针对已经出现的拨模干涉,提出拨模导程的优化方法以及干涉的修正方案和齿面光顺过程。详细讨论金属模具的逐点成形和展成加工方法以及它们各自的适用范围和可加工性,并以刀倾法为例,阐述加工螺旋锥齿轮珩磨轮的金属凸模的计算步骤,为螺旋锥齿轮珩磨轮的制造提供理论依据。     

Qualitative criteria for dynamic buckling of imperfection sensitive nonconservative systems

A qualitative dynamic buckling analysis of imperfection-sensitive non-conservative dissipative systems under path-dependent loading in regions of divergence is presented. Despite the lack of potential for this type of loading a total energy-balance equation allows us to establish a sufficient criterion for dynamic buckling, the counterpart of that valid for potential systems. Moreover, using energy and geometrical considerations for the channel of motion, one can obtain for a 2-DOF model dynamic buckling loads (DBLs) which are practically exact for vanishing but non-zero damping and very accurate for non-zero damping. Numerical results show the efficiency and reliability of the proposed qualitative analysis.     

影响凸轮检测精度的问题与对策

针对目前国内在发动机凸轮检测中 ,选择检测基准、确定检测位置、测头切换、最小判别等方面存在的带有普遍性的影响凸轮检测准确性的问题进行了分析 ,并参照 GB/T1 1 82 -1 996和 GB/T1 6671 - 1 996,以“最小条件”为依据 ,从发动机凸轮升程和转角是非线性函数关系入手 ,对选择凸轮检测基准原则、确定凸轮检测位置 (求解检测起始转角 )方法、凸轮升程检测数据的处理、凸轮升程合格性的判定等进行了论述     

Application of MOS based electronic nose for the prediction of banana quality properties

This study deals with the examination of the ability of a low-cost electronic nose (e‐nose) for prediction of banana quality indices such as total soluble solids (TSS), titratable acidity (TA), pH and firmness at different shelf-life stages. The relationships between sensor array responses of e-nose and quality indices of banana were established by means of partial least squares (PLS), multiple linear regression (MLR) and support vector regression (SVR) techniques. All models for firmness and TSS showed a good prediction performance. However for the TA and pH, there were a poor correlation with the signal of the e-nose in MLR and PLS models. The results proved that performance of SVR models for prediction of the quality indices of banana were better than others, with high correlation coefficients of the cross validation (R² = 0.8852 for firmness, 0.9608 for TSS, 0.7607 for pH and 0.7033 for TA) and relatively low RMSE values of 1.1716 for firmness, 0.9308 for TSS, 0.1523 for pH and 0.0267 for TA. Finally, these results demonstrated that e-nose has the potential of becoming a reliable instrument to estimate chemical and physical properties of banana from signals of an e-nose system.     

制药企业设备管理对策探讨

设备是企业在生产过程中使用最为重要的生产工具,设备不仅让企业的技术和生产质量得到了保证,也标志着企业经济现代化发展的进程,因此设备在企业生产中尤为重要。尤其是制药企业,设备管理的好坏可以说是关系着制药企业的经济命脉,生死存亡。但是,现在大多数的制药企业在设备的管理上并没有引起足够的重视,现状存在着很多的问题,在对制药企业的设备管理进行多年研究的基础上,就设备管理上存在的重点问题进行了分析,并提出了几点建议一起探讨。     

Approximate Formula for the Contact between Truncated Surfaces and Frictional Characteristics of a Journal Bearing in Mixed Lubrication

This paper presents an approximate formula for the contact of a non‐Gaussian distribution of truncated surfaces, which is useful for mixed lubrication theory, and gives a method for the determination of the truncation parameters in this formula from a measured roughness profile. Using this approximate formula for a contact, the approximate formula for the friction coefficient of a journal bearing in mixed lubrication, which was previously proposed by the authors, is modified for truncated surfaces, and the frictional characteristics are demonstrated for various parameters of truncated roughness using the modified formula.     

Standardization in optical coating characterisation

1Introduction Theproductionofopticalthinfilmswith advancedqualityisanenablingtechnologyfor manyinnovativeapplicationsoflasersandmod ernoptics.Prominentexamplesinindustrial productionenvironmentscanbefoundinlaser materialprocessingormicro lithography,where theeconomicefficiencyisdirectlycoupledtothe opticallossesandthelifetimeofthebeamsteer ingorimagingsystems.Alsoinresearchandde velopmentoflasersystemsformedicalapplica tions,opticalmetrology,andinformationtech nology,opticalcomponentshavetoful…     

Simplified theories of flat rolling—II. Comparison of calculated and experimental results

A simplified inhomogeneous solution for the roll pressure has been used as the basis for computing consistent precise estimates of roll force and roll torque from the theory of cold flat rolling. The accuracy of the new method is established in this paper by re-analysing previous data for the rolling of prestrained copper, data for the rolling of annealed mild steel and results for the rolling of low carbon steel with lubrication. Both Swift's stress-strain law and a polynomial function are used to represent the experimental yield data for the rolled materials.     

A handheld support system to facilitate stereological measurements and mapping of branching structures

BranchSampler is a system for computer-assisted manual stereology written for handheld devices running Windows CE. The system has been designed specifically to streamline data collection and optimize sampling of tree-like branching structures, with particular aims of reducing user errors, saving time, and saving data in formats suited for further analysis in other software, for example, a spreadsheet. The system can be applied in a wide range of applications, from biomedical science to agriculture and horticulture. It can be applied for sampling nested generations of lung bronchioles and renal arterioles or for collection and optimizing sampling of crops for precision agriculture. Although the system has been designed specifically for sampling branching structures, it is sufficiently flexible to be used for other applications involving nested stereological designs. We describe the system specifications, software and Graphical User Interface development, functionality and application of the handheld system using four examples: (a) sampling monkey lung bronchioles for estimation of diameter and wall thickness (b) sampling rat kidney for estimating number of arteries and arterioles in a specific generation (c) mapping fruit (apple) tree yield in an orchard and (d) estimating the total leaf surface area of chrysanthemum plants in a greenhouse.