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1.
刘娥  赵宏 《陶瓷》2013,(11):23-25
对珙县原料进行了全面地分析,首先对其外观、干燥性能、化学成分进行分析,其次对烧成性能进行分析,并经分析讨论后得出结论。  相似文献   

2.
本文探讨了光谱分析的定义、工作原理、检测目的、检测方法、对仪器特征进行了分析,对材质特征及功用进行了论述,对以后材质分析工作需要注意的事项-给出了一些建议。  相似文献   

3.
通过对排液管焊口开裂部位进行渗透检验、断口分析、结构设计分析、振动分析、应力状态分析,考虑金属材料化学成分分析和腐蚀介质的成分,对开裂部位的表面裂纹的形貌及产生裂纹的原因进行讨论,并提出了防治措施。  相似文献   

4.
主要介绍了我公司CO产品气的制备工艺,着重对膜分离提纯CO技术的特点进行了探讨,并对膜分离装置产品气的提纯操作、维护进行了分析讨论,同时对其应用于公司其他生产装置代替现有落后工艺的可行性进行了分析。  相似文献   

5.
对纯镁铝尖晶石陶瓷的生产进行了摸索,提出了合理的配方,并对合成、烧成等工艺过程进行了分析,尤其是对添加剂的使用进行了定性、定量的研究。  相似文献   

6.
胜利油田石化总厂重油催化车间气压机BJS1000冷却器接连发生小浮头螺栓断裂故障进行分析,对螺栓化学成分、断口进行了检测,综合分析了螺栓失效的原因,并进行了改进。  相似文献   

7.
海水淡化技术现状及各种淡化方法评述   总被引:33,自引:2,他引:33  
解利昕  李凭力  王世昌 《化工进展》2003,22(10):1081-1084
介绍了海水淡化的各种方法及其原理,对海水淡化技术的研究现状进行了总结,对海水淡化各种方法的能耗、优缺点、适用范围及其发展方向进行了分析讨论,并对海水淡化技术的应用状况进行了分析对比。  相似文献   

8.
本文分析了马西气田位地质构造特征,总结了马西气田的勘探试气情况,对地层压力、温度、产量、渗透性等基本参数进行了归纳,对目前的试气技术进行分析,剖析试气过程中存在的问题,并提出了解决办法,为以后该地区更好地完成试气工作打好基础。  相似文献   

9.
针对储罐清砂困难的问题,目前,胜利油田的污水罐排泥以传统静压排泥方式为主,由于其起步较早、适用范围广、所用设备简单的优点,该技术成为油田应用最多的污水罐排泥技术。近年来,各类重型机械等新型排泥技术逐渐被引入和推广,由于其良好的排泥效果,现在已经进入了较为广泛应用阶段。但是目前没有有效的数值模拟仿真技术对排泥过程进行分析,为此,通过对现场罐底沉积物进行探测,利用Fluent进行了流场仿真,同时对罐底结构进行改进,并对改进方案进行分析,仿真结果对采油厂水罐分析改进提供了有力的支撑。  相似文献   

10.
本文通过动态应变信号的测试及分析,对某设备万向轴断裂的原因进行了故障诊断.通过选用合适的测量电桥和应变计、测试前进行实物标定等技术处理方法,保证了测量信号的准确性。对该设备进行了多工况多循环的信号测试和分析,并采用校核方法,对其万向轴的扭矩传递能力进行了评估,确定了万向轴断裂的原因,提出了相应的改进建议。  相似文献   

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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.  相似文献   

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14.
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.  相似文献   

15.
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.  相似文献   

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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.  相似文献   

19.
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.  相似文献   

20.
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。  相似文献   

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