捣固成形在耐火材料生产中的应用——捣固成形机的研制与设计

捣固成形，在耐火材料生产领域中，是一种既原始又古老的成形方式。在没有成形设备以前，耐火制品成形大都以捣固方式生产。随着生产工艺的改进和技术进步，出现了摩擦压砖机、油压机、振动成形机、等静压机等设备。这些设备在耐火材料行业的广泛应用、逐渐取代了捣固成形。但这种成形方式，由于在生产超厚和异型制品方面，具有通用成形设备无法取代的作用和成形质量优势，许多耐火材料生产企业至今还继续沿用。     

凝胶注模成形技术的研究与发展

凝胶注模成形是一种近净尺寸成形工艺，是制备形状复杂、成分均匀和可靠性高的陶瓷材料的理想成形工艺。笔者阐述了凝胶注模成形工艺过程和成形原理，以及国内外的研究现状，指出了凝胶注模成形技术的未来发展方向。     

陶瓷零件胶态快速成形技术研究新进展

按照使用陶瓷材料形态的差别将其分为陶瓷粉末快速成形与胶态快速成形两大类,而胶态成形由于成形精度高,可机械加工能力好等特点而备受关注。综述了近年来发展迅速、实用性强的几种陶瓷胶态快速成形技术。着重介绍了各种技术的成形方法和原理、工艺过程及研究现状等,通过比较分析了各种快速成形制造技术在陶瓷零件制造中的特点及其存在的问题,给零件成形时不同技术的选择提供了一些参考,并对胶态成形的进一步发展进行了分析和展望。     

陶瓷注射成形技术进展

陶瓷粉末注射成形是从现代粉末注射成形技术中发展起来的一项新型成形技术。本文着重论述了陶瓷注射成形发展的历史、技术特点、工艺及进展情况，并介绍了CIM的典型产品和应用领域。     

UBE表皮低压贴合成形技术

在需要表皮贴合成形的工艺中，传统的低压成形技术往往会导致表皮材受到损伤。UBE表皮低压贴合成形（DIEPREST）技术以其独特的压模调控成形方法使这一难题得以解决。     

陶瓷注射成形技术进展

陶瓷粉末注射成形是从现代粉末注射成形技术中发展起来的一项新型成形技术。本文着重论述了陶瓷注射成形发展的历史、技术特点、工艺及进展情况，并介绍了CIM的典型产品和应用领域。     

钣金件快速制造技术综述

介绍了一种新的柔性多点成形技术，并介绍了其原理和特点以及存在的问题和可能的解决方法。     

膜片弹簧的成形及热处理

概述了膜片弹簧的结构特点及技术要求，分析介绍了几种典型的成形及热处理工艺，讨论了膜片弹簧成形及热处理工艺优化问题。     

冷等静压成形技术及其在精细陶瓷生产中的应用

简要概述了冷等静压成形技术的发展及现状，着重介绍了这种成形方法的特点及工艺技术要求，以及在精细陶瓷成形方面的应用结果。     

卫生陶瓷快干微压组合注浆成形设备

1前言要使卫生陶瓷产品使用功能良好，造型美观，生产企业必须考虑注浆成形这个非常重要的环节，即成形坯体的强度、合格率、含水率、生产能力等。目前国内外厂家主要采用的成形方法为地滩注浆成形、微压组合注浆成形、低压快排水注浆成形、中压注浆成形及高压注浆成形。为了提高效率、降低成本、保证合格率，快干微压组合注浆成形是近年来卫生陶瓷生产中出现的一种新的成形工艺，代表着注浆成形技术及装备的发展方向。2工作原理注浆成形过程中由于模具的多孔性，可吸收坯浆中的水份，与模具表面接触的泥浆形成一层坯体，随着水份的不断析出…     

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.     

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.     

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。