钢包用新型无烟MgO-C砖和Al_2O_3-MgO-C砖

由于酚醛树脂结合ＭｇＯＣ砖和Ａｌ２Ｏ３ＭｇＯＣ砖在煅烧和使用过程中产生大量烟雾和难闻的气味，导致了环境的污染。日本开发了一种新型无烟ＭｇＯＣ砖和Ａｌ２Ｏ３ＭｇＯＣ砖，该产品采用新型结合剂代替酚醛树脂，新型结合剂对环境无害，与石墨、氧化物骨料的混合性能良好，成型后素坯密度高，且具有足够的烧后强度和体积稳定性。研究表明：与普通酚醛树脂结合ＭｇＯＣ砖相比，新型无烟ＭｇＯＣ砖在加热处理过程中产生的苯酚、甲酚、二甲苯酚和其它有害气体大大减少，抗折强度和耐压强度稍微降低，但体积密度较高，热震…     

MgO对高钙硫铝酸盐水泥性能影响的研究

研究了ＭｇＯ对高钙硫铝酸盐水泥矿物形成及性能的影响,结果表明,含有０．５％的ＭｇＯ即可显著改善生料的易烧性,降低熟料中ｆＣａＯ的含量,促进Ｃ３Ｓ及Ｃ４Ａ３Ｓ两种主要矿物的形成。即ＭｇＯ含量这８％,熟料中ｆＣａＯ的含量亦显著降低,掺加ＭｇＯ使矿物的水化活性提高;当熟料中ＭｇＯ含量为０．５％～５％时,不泥强度显著提高,而达８％时,水泥强度则有所降低。     

聚烯烃与金属粘接用CR/CPE-g-MAH胶粘剂的粘接性能的研究(英文)

采用氯丁橡胶（ＣＲ）和ＭｇＯ与氯化聚乙烯接枝马来酸酐（ＣＰＥ－ｇ－ＭＡＨ）共混,制得聚丙烯（ＰＰ）与金属粘接用胶粘剂,室温固化就能获得较高强度。探讨了ＣＲ和ＭｇＯ含量对胶粘剂粘接强度的影响,并考察了这种胶粘剂的耐水性。研究表明,加入ＣＲ和填料有助于提高粘接强度,当ＣＲ／ＣＰＥ－ｇ－ＭＡＨ的质量比为１∶１,且ＭｇＯ含量为３５％时,粘接强度最大,并具有优良的耐水性。     

稀土偶联剂（REC）对PP／Mg（OH）2体系性能的影响

研究了稀土偶联剂（ＲＥＣ）处理对ＰＰ／氢氧化镁（Ｍｇ（ＯＨ）２）体系的燃烧性能、流动性能、力学性能及老化性能的影响。未经处理的Ｍｇ（ＯＨ）２在填充量超过５０％时,ＰＰ／Ｍｇ（ＯＨ）２体系的ＯＩ≥２８．５,但这时冲击强度不足纯ＰＰ的３０％,熔体流动速率低于０．６ｇ／１０ｍｉｎ;而填料用２．５％（重量）ＲＥＣ处理后,填充量为５０％的体系冲击强度接近纯ＰＰ,ＭＦＲ达２．８ｇ／１０ｍｉｎ;ＲＥＣ对Ｍｇ（Ｏ     

原料性能对镁碳耐火材料的显微结构和性能的影响

ＭｇＯ－Ｃ耐火材料的性能主要取决于ＭｇＯ，石墨和抗氧化剂如金属铝的性能，在本文中，论述了用不同粒度的ＭｇＯ，石墨和Ａｌ，并按重量配比制成不同的耐火材料，研究如强度，抗氧化性等与显微结构有关耐火材料的性能。     

MgO－ZrO_2材料的烧结、显微结构和性能

对会ＺｒＯ２５ｍｏｌ％～２５ｍｏｌ％的ＭｇＯ－ＺｒＯ２材料的烧结，显微结构和力学性能进行了研究。与纯ＭｇＯ材料相比，ＺｒＯ２的添加能起到促进烧结和提高材料强度和抗热震性的作用。１７８０℃烧结试样的显气孔率由１６％降至１％．常温抗折强度由５６ＭＰａ提高到９０ＭＰａ以上，１４００℃高温抗折强度由７．２ＭＰａ提高到４７ＭＰａ以上，热震稳定性也随着ＺｒＯ２含量的增加而提高。     

氧化镁粒度配比对MgO—C砖物理性能的影响

本文叙述了通过ＭｇＯ－Ｃ砖物理性能的控制，以及调节氧化镁颗粒的配比，可提高ＭｇＯ－Ｃ砖的耐热震性，高温抗折强度，并降低热应力。     

MgO对阿利特—硫铝酸盐水泥熟料矿物形成及性能影响的研究

研究了ＭｇＯ对阿利特－硫铝酸盐水泥熟料矿物形成及性能的影响。结果表明，含有适量的ＭｇＯ可改善生料的易烧性，促进ｆＣａＯ的吸收，促进Ｃ３Ｓ及Ｃ４Ａ３Ｓ两种主要矿物的形成，有利于其在熟料中的共存；适量的ＭｇＯ亦可提高水泥的强度；阿利特－硫铝酸盐水泥熟料中可允许有较高的ＭｇＯ存在，使高镁原料的利用成为可能。     

MgO—B2O3—SiO2三元系1100℃等温截面的应用

采用粉末烧结方法制备ＭｇＯ－Ｂ２Ｏ３－ＳｉＯ２三元系不同组成的样品，用Ｘ－射线衍射、岩相和化学分析方法结合研究了１１００℃４０≤ＭｇＯ％〈６０组成范围内的相关系，结果表明可用３ＭｇＯ．Ｂ２Ｏ３－２ＭｇＯ．ＳｉＯ２－２ＭｇＯ．Ｂ２Ｏ３，２ＭｇＯ．Ｂ２Ｏ３－２ＭｇＯ．ＳｉＯ２－ＭｇＯ．ＳｉＯ２，２ＭｇＯ．Ｂ２Ｏ３－ＭｇＯ．ＳｉＯ２－ＳｉＯ２三个三角形表示各平衡相的相关系。应用重心规则计算平衡相量与组成     

Ca0.6Mg0.4Zr4（PO4）6陶瓷的抗热震性

Ｃａ０．６Ｍｇ０．４Ｚｒ４（ＰＯ４）６（简称ＣＭ）陶瓷热震后的强度变化与裂纹扩展依赖于材料的热膨胀系数和轴向膨胀特性。以ＭｇＯ作为烧结助剂的ＣＭ１陶瓷，当热震温差ΔＴ＝８００℃时，残留强度与原始强度相关。作者提出裂纹部分闭合模式解释了上述现象。以ＺｎＯ作烧结助剂的ＣＭ２陶瓷，其强度降低和裂纹扩展符合Ｈａｓｓｅｌｍａｎ提出的脆性陶瓷热震理论。     

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.     

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.     

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.     

Novel polyurethane coating technology through glycidyl carbamate chemistry

Glycidyl carbamate chemistry combines the excellent properties of polyurethanes with the crosslinking chemistry of epoxy resins. Glycidyl carbamate functional oligomers were synthesized by the reaction of polyfunctional isocyanate oligomers and glycidol. The oligomers were formulated into coatings with several amine functional crosslinkers at varying stoichiometric ratios and cured at different temperatures. Properties such as solvent resistance, hardness, and impact resistance were dependent on the composition and cure conditions. Most coatings had an excellent combination of properties. Studies were carried out to determine the kinetics of the curing reaction of the glycidyl carbamate functional oligomers with multifunctional and model amines. Detailed kinetic analysis of the curing reactions was also undertaken. The results indicated that the glycidyl carbamate functional group is more reactive than a glycidyl ether group. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, on October 27–29, 2004, in Chicago, IL.