建筑结构工程抗震设计思路及策略的浅述

对于建筑工程项目的具体设计来看,结构方面的有效设计处理是比较重要的一个方面,而这种建筑结构工程的设计处理又需要全面考虑各个方面的重要参数指标,比如对于抗震性能就需要进行重点关注,保障其能够具备理想的设计处理效果。本文就重点围绕着建筑结构工程抗震设计思路及其相应设计策略进行了简要分析和论述。     

长输管道竣工测量数据处理方法研究

为提高管道竣工测量数据处理效率,设计了一种长输管道竣工测量数据处理方法.采集了长输管道竣工测量数据,进行数据驱动预处理,设计了长输管道竣工测量数据集成监控处理平台,实现了管道竣工测量数据处理.实验结果表明,设计方法的处理时间短,处理效率高.     

长沙市固体废弃物处理场渗沥液处理工程

长沙市固体废弃物处理场渗沥液处理工程是目前国内达到垃圾填埋场污染物排放限制(GB 16889-2008)要求的大型渗沥液处理厂,于2010年6月建成,最大处理规模达到1 500 t/d,采用(A/O)2-MBR+RO/NF处理工艺设计。经运行验证,处理系统稳定高效,出水水质良好达标。文中对工程概况、污水特点、工艺流程、单元设计及运行效果进行了说明,并对本项目设计经验进行了总结。     

公路软土地基处理设计方法探讨

近年来,我国公路建设项目越来越多。软土地基是公路工程施工过程中的常见问题,需要专业设计人员结合土层的具体情况进行科学合理的处理方法。文章从软土路基这个角度进行探讨,对公路软土地基处理设计方法进行论述。     

广东某危废站尾水深度处理工程设计案例分析

以广东某危废站处理规模为900 m3/d的尾水深度处理工程为例,进行了工艺设计解析.工程采用垂直流人工湿地工艺处理含盐且水质波动大的危废站尾水,在设计时着重填料种类和结构的优化、配水及出水系统的设计,并充分考虑出水异常情况下的处理方法,设计了不同的运营模式,保证出水达到地表水IV类标准.该工程是一项集污水处理、科普教育...     

公路路基路面设计中的软基处理分析

本文以公路路基路面设计中的软基处理为主题展开论述,首先分析了公路软土路基特点,然后重点针对公路路基路面设计中软基处理的具体内容进行了分析探讨。     

基础选择与地基处理方法概述

在地基基础设计中包括了对基础的设计和对地基的处理，二者是密不可分的。地基处理的好坏将直接关系到基础的选型和造价。本文就地基的处理进行的讨论。在地基基础设计中，基础的选型必须根据上部结构的荷载、地基土体的承载力和工程造价综舍各方面的情况进行确定。     

给水厂排泥水处理系统设计

通过设计干泥量的计算方法,确定排泥水处理规模。根据排泥水处理系统工艺流程,对排泥水收集、调节、浓缩和脱水工艺进行分析,并对其中排水池、排泥池、浓缩池、平衡池和脱水工艺的设计要点进行总结。     

某化工企业给水工程改造工艺设计

某化工企业扩建中所需生产新水量、循环冷却水量和消防水量增加都很大。为了满足扩建后工艺用水量的要求,结合厂区给水工程情况和工艺需水量,进行了厂区给水工程工艺和处理设施改造设计。改造内容涉及水源地取水泵房、输水管线、水厂处理构筑物、二级泵房、消防泵房和厂区给水管网等。对厂区生活给水系统,包括深井取水设施、处理装置、消毒设施、二级泵房等进行了新建设计。为节约用水和便于管理,对扩建所需的循环冷却水系统按独立运行方式进行设计;并根据建设单位要求对厂区原循环冷却水系统进行工艺改造设计。     

陕西延长乙苯装置地基基础的防渗设计

根据《湿陷性黄土地区建筑规范》及地质勘察报告提供的有关数据,该设计需要对地基进行处理.通过几种地基处理方案比较,明确了防渗处理方法;介绍了施工顺序、技术要点、注意事项,并通过分析,提出了基础选型,以便于设计人员选用.     

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.     

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.     

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.     

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。     

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.     

ICP-MS法测定地球化学样品中As、Cr、Ge、V等18种微量痕量元素的研究

建立了测定地球化学样品中包括As、Cr、Ge、V等18种微量、痕量元素的ICP-MS方法。地化试样用HF-HNO3混酸分解后,以1 1 HNO3溶解干渣。由于制样不使用盐酸,避免了Cl对As、Cr、Ge、V的质谱干扰。用国家一级地球化学标准物质GBW 07309制备溶液优化仪器工作参数,并用于校准。方法测定限(6s)为:0.007~6.4μg/g,精密度(RSD%,n=12)为:29%~9.4%,经过国家一级地球化学标准物质的分析验证,结果与标准值吻合。方法已应用于国土资源调查的试样分析。