化学工程技术经验交流会议技术报告摘要

1、浮动舌形塔板的流体力学及传质试验报告(兰州石油机械研究所) 浮动舌形塔板是一种并流喷射型塔板,利用气相喷射将液相分散进行传质。在结构上的特点是:将固定舌形塔板的舌片做成张角可以从0°到20°自由开闭的活动舌片,舌片制作简便开启灵活。经过实验室内的试验证明:此塔具有压降低,操作弹性比大,泄漏量小,制造安装方便,流体不会成片状喷射等优点。     

鳍片管束分离器气固两相流动特性的PDA试验研究

<正>引言 惯性分离器与旋风分离器相比具有结构简单、易于布置、运行费用低等优点,因此广泛应用于循环流化床锅炉中。现有的许多惯性分离器都占据一个很大的水平烟道,使过热器布置不便,且对材质要求高,不能很好地满足大型化循环流化床锅炉的需要。浙江大学开发的新型鳍片管束撞击式分离器,其分离元件是由鳍片焊在锅炉中垂直布置的过热管束或对流管束上构成,从而将分离与强化传热相结合,分离性能试验研究表明其具有高效、低阻、结构紧凑、能强化传热、降低磨损等优点。为进一步研究鳍片管束分离器的分离、传热、磨损等特性,本文用三维粒子动态分析仪（3D-PDA）对其流动特性进行了冷态试验研究,并考虑了来流风速和鳍片结构对流动特性的影响。本文对测试结果进行了分析讨论,这些结果为鳍片管束分离器的优化设计以及气固分离机理的研究奠定了良好的基础。     

强化垂直潜流人工湿地氨氮去除试验研究

引入空气导管强化垂直潜流人工湿地复氧效果,进而提高其处理高氨氮农村生活污水时的氨氮去除能力。在连续一个月的跟踪考察试验中发现垂直潜流人工湿地引入空气导管后,氨氮平均去除率可达87.05%,出水氨氮质量浓度达到城镇污水处理厂污染物排放标准(GB 18918-2002)一级B排放标准;引入空气导管可显著提高垂直潜流人工湿地大气复氧能力,强化复氧量约为1.22 g/(m2.h);基质内部通气状况更有利于硝化细菌繁殖生长,硝化能力比传统垂直潜流人工湿地提高近一倍。     

计算机硬盘用胶的选择条件

1　前言粘接技术在电子工业中得到了越来越多的应用 ,但国内在这方面的报道却不多。众所周知 ,计算机是通过磁头从硬盘磁碟中读取或写入信息的。而磁头就是用胶粘剂粘在折片上 ,再经其它加工工艺制成磁头臂组合 ,然后安装在计算机硬盘中的。下面就以计算机的硬盘为例 ,介绍计算机硬盘用胶的选择条件。2　胶粘剂的选择2 1　工艺简介磁头与折片粘接工作程序是 :把少量的胶加在折片前端的舌片上 ,再由夹具夹着磁头放在舌片加胶处。用一定强度的紫外光照射数秒钟 ,使胶粘剂初固化 ;然后从自动粘合机中取出 ,经加工处理后放入烘箱 ,在设定的温度…     

中心圆柱电极EHD强化垂直管内沸腾换热的实验研究

以R123为工质采用中心圆柱电极对垂直管内沸腾换热的EHD强化进行了实验,得出了沸腾传热系数与电场强度、热流密度等相关参数的关系.测试了外加电场的电流以及击穿电场强度.从外加电场影响气泡的成长、跃离和运动规律的角度对EHD强化垂直管内沸腾换热的机理进行了分析.     

一种轮胎硫化机装胎机构的爪片

一种轮胎硫化机装胎机构的爪片,由挂胎板、连接板和护板组成,其挂胎长度介于长爪片挂胎板和短爪片挂胎板之长度之间,在挂胎板中腰外侧垂直连接着连接板,在挂胎板中腰垂直连接着连接板,在挂胎板中腰的连接板与下端头之间连有护板。该爪片挂胎板具有足够的导入长度,不会刮损胶囊,同时其刚性好,对中精度高（专利号 ZL 00246605.8）。 XJ-03摘自《实用新型》6.20第17卷25号 一种轮胎硫化机装胎机构的爪片     

螺旋片强化的套管式换热器壳侧传热特性

为揭示螺旋片强化套管式换热器壳侧传热的机理,以指导此类换热器的进一步强化,对螺旋片强化的套管式换热器壳侧的传热和阻力特性进行了实验研究,并与光滑内管换热器进行了比较;利用可实现的k-ε湍流模型,对螺旋片强化的套管式换热器壳侧流体的流动和传热特性进行了数值模拟,研究了正交螺旋坐标系下壳侧螺旋通道中的流场结构.实验结果表明...     

粗糙管换热器带自旋流的复合强化传热技术

介绍了粗糙管换热器中沿传热管轴向间隔分置旋流片的两区协同强化传热方法。旋流片使流体产生螺旋流,螺旋流在离开旋流片之后依靠自身的运动惯性保持一定距离的自旋流,对管道近壁区与中心区产生互动的协同传热强化。此外,该方法也可用于管间,除了对管间管束的机械支撑外,旋流片也可使管间流体产生自旋运动,实现壳程流体的两区协同传热强化。对现有工业系统的换热器技术升级、实现节能降耗意义重大。     

论垂直管理后的区县环境监测工作

介绍了河北省垂直管理改革的案例,分析了区县环境监测站存在的问题及面临的挑战,指出垂直管理后区县环境监测工作的思路是转变旧观念,加强监测队伍建设,实现人员转型升级,全面提升质量管理,强化执法监测职能,最终做好环境监管执法。     

换热器肋片的最小熵产优化研究

<正>肋片作为一种非常高效的强化传热技术,不仅是作为二次传热面,扩大传热面积,并促进流体介质扰动来强化换热,同时其增加的传热面积也会造成相对增加的流动阻力.关于肋片强化传热与增大流阻的综合评判准则在文献[1]中已有论述     

Sapindaceae,cyanolipids, and bugs

Scentless plant bugs (Heteroptera: Rhopalidae) are so named because adults of the Serinethinae have vestigial metathoracic scent glands. Serinethines are seed predators of Sapindales, especially Sapindaceae that produce toxic cyanolipids. In two serinethine species whose ranges extend into the southern United States,Jadera haematoloma andJ. sanguinolenta, sequestration of host cyanolipids as glucosides renders these gregarious, aposematic insects unpalatable to a variety of predators. The blood glucoside profile and cyanogenesis ofJadera varies depending on the cyanolipid chemistry of hosts, and adults and larvae fed golden rain tree seeds (Koelreuteria paniculata) excrete the volatile lactone, 4-methyl-2(5H)-furanone, to which they are attracted.Jadera fed balloon vine seeds (Cardiospermum spp.) do not excrete the attractive lactone. Loss of the usual heteropteran defensive glands in serinethines may have coevolved with host specificity on toxic plants, and the orientation ofJadera to a volatile excretory product could be an adaptive response to save time.Mention of a commercial product does not consititute an endorsement by the USDA.     

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.     

2008～2009年世界塑料工业进展

收集了2008年7月～2009年6月世界塑料工业的相关资料,介绍了2008～2009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、环氧树脂、不饱和聚酯树脂)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。     

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.