氨法脱硫烟气在线连续监测系统采样净化预处理装置改造

介绍氨法脱硫烟气在线连续监测系统的配置及其构成,分析了存在的问题。2011年7月,对第2期烟气在线连续监测系统采样与预处理装置进行了改造,改造后采样管路无结晶、不堵塞;2012年4月,对第1期烟气在线连续监测系统采样和预处理装置也进行了相应的改造,以防止采样管线因出现铵盐结晶而堵塞,确保检测精度,保证了烟气在线连续监测系统的长周期正常运行。     

浅谈石油化工企业可燃/有毒气体报警系统的设计

可燃/有毒气体报警系统在石油化工企业中有着广泛的需求和大量的应用。简单叙述可燃/有毒气体报警系统的设计步骤和注意事项,包括检测气体的确定、探测器的布置和安装、联动控制和布线等。     

建筑综合布线工程系统的屏蔽与接地

本文阐述了综合布线系统中的屏蔽技术及综合布线系统接地的结构和应符合的规定,综合布线系统作为建筑智能化不可缺少的基础设施,其系统屏蔽及接地系统的好坏将直接影响到综合布线系统的运行质量,故而显得尤为重要。     

基于GPRS技术的烟气实时监控系统

基于GPRS技术设计了一套烟气实时监控系统,应用GSM网络提供的GPRS无线上网业务,实现对烟气参数的远程检测、实时监控功能。该系统构建简单,站点扩充容易,并不受地理位置限制。试运行表明系统稳定可靠,操作方便。     

综合布线在某电话系统改造中的应用

随着科学技术的迅猛发展,以电话业务为主的通信网逐渐向综合业务数字网过渡,综合布线取代单一、昂贵、复杂的传统布线是科技发展的必然趋势。结合某院电话系统改造工程,分析了综合布线系统的特点、适用范围。指出应根据工程的实际情况和用户的客观需要,以及现场具体条件来确定综合布线系统的综合范围。     

锅炉烟气氧含量测量技术的优化分析研究

目前锅炉厂多数采用氧化锆传感器来测量烟气含氧量，其长时间使用会导致堵塞，使检测精度下降。而采用PSO-LSSVM算法建立软测量模型，通过利用现有锅炉DCS系统，建立烟气含氧量软测量系统，并通过OPC技术完成Win CC和MATLAB数据的实时互换，实现烟气氧含量的在线检测。实践应用表明，实测值和软测量值的绝对误差仅在0.01～0.025范围内波动，有利于及时修整现场氧化锆传感器。     

化工自动控制系统的应用体会

综述了自动控制技术发展现状以及其在化工领域的应用情况,从温度检测布线环节、流量测量仪表选用、计量仪表温差补偿以及温度检测套管安装等角度论述了自控系统应用体会。     

医院网络综合布线系统工程设计与实现

网络综合布线系统是现代高新技术应用的基础,同时信息化社会发展的趋势。进行结构化综合布线,对于提升信息服务质量和现代经济发展具有重大影响。以广州前海人寿医院项目为例,在阐述医院大楼综合布线必要性的基础上,就综合布线系统的内涵及特性进行分析,并指出网络综合布线工作区子系统、水平子系统、管理子系统、垂直干线子系统、设备间子系统的设置要点。期望有利于提升网络综合布线系统建设质量,进而为医院信息化管理与服务提供保证。     

智能大厦综合布线系统

文章阐述了综合布线系统的需求和产生,着重论述了综合布线系统的组成、系统设计标准、规范和一般设计方法及最终达到的系统性能     

无线应变测试系统在钻机井架检测中的应用

应力测试是石油钻机井架检测的主要项目之一,传统的应变测试系统缺点是需要大量布线,效率低下。针对传统有线应变测试系统存在的问题,设计了基于无线网络的钻机井架应变测试系统。这种无线测试系统具有测试精度高、稳定性强、高效率、高可靠性、低功耗等优点,适合钻机井架检测中应用。     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Many Drugs of Abuse May Be Acutely Transformed to Dopamine,Norepinephrine and Epinephrine In Vivo

It is well established that a wide range of drugs of abuse acutely boost the signaling of the sympathetic nervous system and the hypothalamic–pituitary–adrenal (HPA) axis, where norepinephrine and epinephrine are major output molecules. This stimulatory effect is accompanied by such symptoms as elevated heart rate and blood pressure, more rapid breathing, increased body temperature and sweating, and pupillary dilation, as well as the intoxicating or euphoric subjective properties of the drug. While many drugs of abuse are thought to achieve their intoxicating effects by modulating the monoaminergic neurotransmitter systems (i.e., serotonin, norepinephrine, dopamine) by binding to these receptors or otherwise affecting their synaptic signaling, this paper puts forth the hypothesis that many of these drugs are actually acutely converted to catecholamines (dopamine, norepinephrine, epinephrine) in vivo, in addition to transformation to their known metabolites. In this manner, a range of stimulants, opioids, and psychedelics (as well as alcohol) may partially achieve their intoxicating properties, as well as side effects, due to this putative transformation to catecholamines. If this hypothesis is correct, it would alter our understanding of the basic biosynthetic pathways for generating these important signaling molecules, while also modifying our view of the neural substrates underlying substance abuse and dependence, including psychological stress-induced relapse. Importantly, there is a direct way to test the overarching hypothesis: administer (either centrally or peripherally) stable isotope versions of these drugs to model organisms such as rodents (or even to humans) and then use liquid chromatography-mass spectrometry to determine if the labeled drug is converted to labeled catecholamines in brain, blood plasma, or urine samples.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Novel polyurethane coating technology through glycidyl carbamate chemistry

Glycidyl carbamate chemistry combines the excellent properties of polyurethanes with the crosslinking chemistry of epoxy resins. Glycidyl carbamate functional oligomers were synthesized by the reaction of polyfunctional isocyanate oligomers and glycidol. The oligomers were formulated into coatings with several amine functional crosslinkers at varying stoichiometric ratios and cured at different temperatures. Properties such as solvent resistance, hardness, and impact resistance were dependent on the composition and cure conditions. Most coatings had an excellent combination of properties. Studies were carried out to determine the kinetics of the curing reaction of the glycidyl carbamate functional oligomers with multifunctional and model amines. Detailed kinetic analysis of the curing reactions was also undertaken. The results indicated that the glycidyl carbamate functional group is more reactive than a glycidyl ether group. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, on October 27–29, 2004, in Chicago, IL.