空心转子等壁厚定子螺杆泵技术现场试验可行性分析

由于常规螺杆泵定子橡胶簿厚不均，摩擦受热温度也不相同，而且橡胶部件对工作的环境、工况性能又极为敏感，所产生的变形也就不一致，如果再改变其工作的性能，增大工作扭矩，这样就更会使泵的工作性能下降，发生早期失效，缩短泵的使用寿命。为了改进常规螺杆泵定子技术的不足，减小定子型线变形对螺杆泵工作性能的影响、提高螺杆泵的工作性能、延长其使用寿命，开发研究了空心转子等壁厚定子螺杆泵，等壁厚定子螺杆泵的特殊结构设计，解决了常规螺杆泵定子技术的不足，提高螺杆泵的工作性能，延长其使用寿命，本文通过对设计结构原理、现场试验效果分析，论述了空心转子等壁厚定子螺杆泵技术可行性。     

螺杆泵采油工艺的合理应用

介绍了螺杆泵采油工艺，并从井下管柱配套，转速调整技术，工况测试诊断，直驱式螺杆泵，连续杆装置等方面阐述了螺杆泵采油工艺及其配套技术的应用，同时，分析了螺杆泵采油工艺的未来发展。     

用氧化锌晶须改善稠油冷采中螺杆泵定子的耐磨性能

随着采油工艺技术的不断发展，螺杆泵采油技术在稠油出砂冷采中得到了普遍应用。并取得了巨大的经济效益。但在生产过程中，螺杆泵易因砂磨而失效。这主要是由于砂子的存在。使得泵中的元件发生缓慢的剪切作用。从而造成螺杆泵持续使用寿命平均为10～12月。通过螺杆泵的工作原理，分析了定子在工作过程中的受力状况，列出了造成螺杆泵磨损的因素。得出了螺杆泵的磨损分布规律，进而分析了螺杆泵橡胶定子在稠油携砂冷采中的磨损机理，最后提出了在传统的螺杆泵生产材料丁腈橡胶的基础上，用氧化锌晶须对其进行改性来提高螺杆泵在稠油冷采工况下的耐磨性。     

螺杆泵井高流压的原因及治理方法

螺杆泵采油技术是目前应用较广泛的人工举升采油方式，在油田生产中占有重要位置。由于螺杆泵井是一种特殊的有杆泵采油，不可避免地会出现各种机械故障，再加上管理不到位以及客观因素的影响等，使螺杆泵井出现高流压现象，降低了螺杆泵井产液量。能够及时发现、分析、诊断、处理螺杆泵井在生产过程中出现的高流压状态，将产量影响降低到最小，实现经济效益最大化。     

螺杆泵在粘胶制备应用中存在的问题及改进措施

简要阐述了螺杆泵的应用特点及与其它泵的对比，指出了螺杆泵在粘胶制备应用中存在的问题，并结合生产实际采取了相应的改进措施。通过对螺杆泵材质、结构、机械密封的改进，降低了故障率、提高了使用寿命。     

热采工艺中螺杆泵定子橡胶的研究与应用

随着各大油田对稠油开发日益受到重视，螺杆泵热采工艺已成为各油田针对稠油开采的一个重要的研究方向。稠油井以蒸汽吞吐开采为主，注气后井温较高，为200摄氏度以上，而普通螺杆泵耐温仅为90摄氏度，致使注气后不能直接下泵生产，螺杆泵应用受到很大局限。近年来我国在高温螺杆泵研制方面获得突破性进展，通过在多个油田现场应用，性能基本达到设计及生产要求     

探讨螺杆泵在原油集输中的应用

近年来随着技术的发展，螺杆泵开始越来越多的被广泛应用，本文从螺杆泵技术发展概况和应用范围。工作原理出发进行探讨。     

螺杆泵井优化设计模型的建立及优化软件应用效果分析

随着螺杆泵作为新兴的举升方式在国内各油田大规模的推广,螺杆泵井合理的优化设计成为提高螺杆泵井的管理水平的关键。目前螺杆泵井优化设计方法及软件较多,应用比较成熟的有加拿大C—FER公司推出的PC-PUMP软件和东北石油大学开发的《螺杆泵系统优化设计软件》。可对新投产螺杆泵井和在用螺杆泵井进行单井优化和参数优选,本文主要是针对优化设计软件优化模型建立并对软件的实际应用效果进行分析评价,这对提高螺杆泵设计水平及螺杆泵井系统效率,充分发挥螺杆泵工艺的整体技术优势具有重要指导意义。     

螺杆泵电参分析泵况实验

随着螺杆泵采油系统在油田生产中的广泛应用,油井故障不可避免的发生在生产过程中,目前针对螺杆泵泵况分析的手段量油和憋泵都有一定的局限性,不能准确的判断螺杆泵工况。不清楚扶正器对螺杆泵生产的影响。因此有必要对螺杆泵井工况分析技术进行研究,以提高螺杆泵采油技术水平及经济效益。本文通过模拟螺杆泵杆断与泵漏失所取得的数据进行分析,研究螺杆泵扶正器对电流、扭矩和能耗的影响。总结管理办法,对螺杆泵管理起到一定的指导作用。     

螺杆泵制造模式分析及影响因素探讨

将我国螺杆泵制造业现状同国外进行比较,主要从螺杆泵的定子转子结构、加工制造和检验方面寻找与国外螺杆泵制造业之间的差距,对螺杆泵的制造模式可行性进行分析和研究,进一步扩大螺杆泵的生产规模,为我国螺杆泵生产效率的提高提供有力依据。     

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.     

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.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料，介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比，介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序，对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。     

Inorganic/organic nanocomposite coatings: The next step in coating performance

Inorganic/organic hybrid materials have considerable promise and are beginning to become a major area of research for many coating usages, including abrasion and corrosion resistance. Our primary approach is to prepare the inorganic phase in situ within the film formation process of the organic phase. The inorganic phase is introduced via sol-gel chemistry into a thermosetting organic phase. By this method, the size, periodicity, spatial positioning, and density of the inorganic phase can be controlled. An important aspect of the inorganic/organic hybrid materials is the coupling agent. The initial task of the coupling agent is to provide uniform mixing of the oligomeric organic phase with the sol-gel precursors, which are otherwise immiscible. UV-curable inorganic/organic hybrid systems have the advantages of a rapid cure and the ability to be used on heat sensitive substrates such as molded plastics. Also, it is possible to have better control of the growth of the inorganic phase using UV curing. It is our ultimate goal to completely separate the curing of inorganic and organic phases to gain complete control over the morphology, and hence optimization of “all” the coating properties. Thus far, it has been found that concomitant UV curing of the inorganic and organic phases using titanium sol-gel precursors afforded nanocomposite coatings which completely block the substrate from UV light while maintaining a transparent to visible light. Also, it has been found that the morphology of the inorganic phase is highly dependent on the concentration and reactivity of the coupling agent. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004, in Chicago, IL.