节能环保在建筑给水排水工程中的应用浅述

随着社会污染的情况越来越严重，能源供应越来越紧张，节能、环保越来越引起人们的重视。在现代建筑设计中，节能、环保技术的运用越来越引起国家的重视，并因此出台了一系列的法规，随着技术的发展，运用在环保节能的技术会越来越成熟。     

线锯切割技术的应用与发展

随着电子工业的飞速发展,晶片的应用越来越广泛,晶片加工技术也越来越受到重视,其中晶片切割是制约后续工序中成品率高低的重要工序.文章概述了半导体材料切割技术现状,介绍了线锯切割的技术原理及其切割机理,并提出了线锯切割技术的发展趋势.     

电子信息工程领域计算机网络技术的应用研究

电子信息工程领域中越来越多的应用到计算机网络技术,对计算机网络技术的依赖越来越强。本文对计算机网络技术在电子信息工程领域中的应用情况进行了分析探讨。     

刍议注浆技术在房建工程中的应用

随着时代的发展和科学技术的不断进步,房建工程如雨后春笋般的拔地而起,越来越多的房建工程使得人们对其要求越来越高,而注浆技术施工因具有噪音低和振动小等优势而广泛被人们接受,注浆技术在房建工程中的应用越来越普及。本文主要阐述了房建工程中应用注浆施工技术的意义,探讨了注浆施工技术在房建工程中的应用,最后提出了解决注浆施工技术在房建工程中问题的一些措施。     

抗震技术在房屋结构设计中的应用

高层建筑随着社会的进步、经济的发展变得越来越多、越来越普遍,所以房屋结构设计中对抗震技术的应用逐渐成为建筑的设计的重点。如今,国家对于房屋施工技术也有了越来越高的要求,抗震技术是一个高科技技术。该文对在房屋结构设计中抗震技术的应用的必要性以及原理进行了分析,阐述了在房屋结构设计中如何应用抗震技术,又提出了抗震技术的应用创新,希望能够对我国抗震技术在房屋结构设计中应用的发展以及进步起到促进作用。     

浅析智能控制技术在工程机械控制中的应用

随着我国基础建设规模越来越大,难度也越来越高,对工程机械的性能和操作控制也造成了不小的压力,随着智能控制技术的发展和进步,智能控制技术成为了应对工程机械越来越高的操作需求的有效方法。与传统人工操控工程机械的方式相比,应用智能控制技术后工程机械向着更高效、更安全、更精准的方向发展。本文对智能控制技术在工程机械控制中的应用进行了简要分析,希望能促进智能控制技术在工程机械控制方面的技术进步。     

PDMS在化工管道设计中的应用

随着当代我国科技的高速发展,业内人士对于科研工作提出了越来越高的要求,为了促使工业设计工作的科学性及准确性得到提升,在大型工业设计工作之中,传统二维技术已经基本被淘汰,三维设计技术应用范围则越来越大。当前PDMS技术已经处于较为成熟的状态,并且在我国的化工管道设计工作中得到了越来越多的应用。为了促使PDMS技术在化工管道设计工作中得到越来越高效的应用,对PDMS在化工管道设计中的应用策略进行分析。     

变频电气控制柜的技术创新与节能措施

随着我国经济的高速发展,对石油资源的需要量越来越大,各种油田采油工程也越来越多,对相关技术的应用要求也不断提高,对各种新技术的应用越来越多。在科技不断发展的今天,自动化成为工业发展的重要趋势,尤其是变频技术的使用,进一步提高了对电机的使用效果,降低了电动机的能耗。     

试析图像识别技术在人工智能中的应用

进入新世纪后,国家科学技术获得快速发展,信息化程度越来越高,人工智能技术应用的程度也越来越广泛,其中人工智能中的图像识别技术也更加重要,应用范围不断扩大,因此探讨人工智能中的图像识别技术就显得极为重要,具有较强的现实意义。笔者在本文中首先研究了图像识别技术的原理及其识别模式,然后探讨了图像识别技术工作的过程,探讨了当前几种应用比较广泛的图像识别技术。     

基于PLC的钢厂热连轧感应加热炉控制系统实现

随着节能降耗技术的要求越来越高,大功率感应加热炉技术在钢厂热连轧系统中应用越来越广泛.利用西门子PLC实现对大功率感应加热炉的自动控制,实现对钢铁热连轧的温度分布控制要求.现场应用证明:该技术大大降低了系统整体能耗.     

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.     

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。     

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.     

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。     

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.     

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.