四鞍座设备的强度校核

将卧式容器的多鞍座问题转化为多个双鞍座卧式容器来计算。利用三弯矩方程,分别计算各鞍座处的弯矩、支承力和极值弯矩,找出最大弯矩和鞍座反力。按NB/T 47042—2014《卧式容器》中的公式和方法进行应力计算及校核,得到强度校核结果。     

接管弯矩在筒体中引起的局部应力

对按管弯矩在圆筒形压力容器中引起的局部应力进行了试验研究及三维有限元分析。研究工作的范围包括3台具有不同d/D比值的试验容器。研究结果表明：由接管弯矩（包括纵向弯矩及横向弯矩）在圆柱形容器及接管中引起的应力有明显的局部性；同时表明，横向接管弯矩M_c在容器横向截面产生的应力与同样大小的纵向接管弯矩M_L在容器纵向截而内产生的应力大得多。研究结果与WRC.107及WRC．297等计算方法的结果进行了比较。     

接管弯矩作用下筒体—补强圈补强区局部应力的试验研究

本文对接管弯矩作用下压力容器开孔－补强的局部应力进行了试验研究。研究范围包括三台具有不同ｄ／Ｄ比及补强圈补强的试验容器。试验结果表明，在接管弯矩作用下，容 筒体在补强圈补强范围内的局部应力，特别是孔边的应力集中明显降低，但由于几何形状的不连续及焊缝的作用，在补强圈边缘特别是容器横向截面内出现了较大的不连续性应力，试验结果同时表明，接管横向弯矩Ｍ０在容器横向截面内产生的应力比接管纵向弯矩ＭＬ在容器纵     

超长卧式容器的多支承设计和计算

本文根据三弯矩方程来叙述超长式容器的设计及计算。     

接管弯矩作用下筒体-补强圈补强区局部应力的试验研究

本文对接管弯矩作用下压力容器开孔-补强区的局部应力进行了试验研究。研究范围包括三台具有不同d/D比及补强圈补强的试验容器。试验结果表明,在接管弯矩作用下,容器筒体在补强圈补强范围内的局部应力,特别是孔边的应力集中明显降低,但由于几何形状的不连续及焊缝的作用,在补强圈外边缘特别是容器横向截面内出现了较大的不连续性应力,试验结果同时表明,接管横向弯矩M_o在容器横向截面内产生的应力比接管纵向弯矩M_L在容器纵向截面内产生的应力要大很多。     

多支座卧式容器的受力分析和强度计算

本文根据材料力学理论,对多支座卧式容器进行受力分析,给出了剪力和弯矩的计算方法,并对容器的应力计算进行分析,可作为工程设计参考。     

特殊卧式容器的载荷分析

对于封头及筒体处安装较大部件的卧式容器 ,应考虑这些部件引起的载荷。本文针对附加载荷作用的三种情况 ,分析了载荷的性质 ,推导出附加载荷作用时特殊卧式容器剪力与弯矩的计算公式     

特殊卧式容器的载荷分析

对于封头及筒体处安装较大部件的卧式容器 ,应考虑这些部件引起的载荷。本文针对附加载荷作用的三种情况 ,分析了载荷的性质 ,推导出附加载荷作用时特殊卧式容器剪力与弯矩的计算公式。     

基础沉降量对三鞍座卧式容器的影响

本文从理论上 ,将基础沉降量对三鞍座卧式容器中的支承反力与弯矩的影响进行尝试性公式推导。供参考。     

RT桨搅拌槽内液位对轴弯矩的影响

采用高精度的应变式传感器技术,实验研究了搅拌槽内不同液位对搅拌轴弯矩的影响规律.研究结果表明：操作液位对搅拌轴弯矩的幅值特性和频率特性有着重要影响,在临界液位以下,搅拌轴的弯矩很不稳定,当高于临界液位,搅拌轴弯矩将趋于相对稳定,研究结果对搅拌轴的设计具有指导意义.     

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.     

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.     

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.     

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.