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本文介绍了塑料在汽车,情报通信,电子,家电,办公机器,电线电缆,机械部件,船舶,航空宇航,铁道车辆,原子能设备,包装容器,医疗等领域的应用实例。 相似文献
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陶瓷美术作品的艺术魅力,在于巧用艺术手法,艺术手法大致可分引用,映衬,象征,双关,拟人,夸张,借代,对比,比喻,渲染等类,巧用这些手法,能大大地增强作品的艺术感染力。 相似文献
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2001—2002年国外塑料工业进展 总被引:7,自引:0,他引:7
CHINA PLASTICS INDUSTRY Editorial Office 《塑料工业》2003,31(3):1-21,25
收集了2001年7月到2002年6月有关国外塑料工业的相关期刊资料,介绍了2001年到2002年国外塑料工业的发展情况,提供了世界各地域塑料原材料的产量及构成比,日本,美国,加拿大,德国,法国,比利时,墨西哥,芬兰,西班牙等国家的树脂产量,消费量及增长率,以及日本,西欧,北美等地区的不同品种塑料原料消费量和增长率统计,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),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)不同品种的顺序,对树脂的产量,消费量及合成工艺,产品应用开发,树脂品种的延伸及应用的进一步扩展等有关技术作了详细的介绍。 相似文献
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2004年12月28日,《腐植酸》杂志迁址,改版,增期后第一届编辑委员会在北京圆山大酒店召开。参加编委会的委员来自中国科学院,中国农科院,中国农业大学,中国矿业大学,北京理工大学,北京化工大学,黑龙江省林科院,河南省科学院,山东科技大学, 相似文献
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报道了用盐酸,氢氟酸,高氯酸溶样,以稀盐酸为介质,空气-乙烯火焰原子吸收法连续测定地质样品中的Cu,Pb,Zn,Fe,Co,Ni,Cr,Li,Mn,Rb,K,Na,方法简单快速,并讨论了仪器工作条件和主要干扰因素的消除,对于地质标样,测定结果的相对标准偏差不超过5%。 相似文献
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考察了六水合硝酸锌、四水合磷酸锌、七水合硫酸锌、氧化锌、碳酸锌、碱式碳酸锌、氢氧化锌、甲酸锌、二水合乙酸锌、二水合环己烷丁酸锌(ZCHBDH)以及二水合硬脂酸锌,在1,5-萘二胺(NDA)与碳酸二甲酯(DMC)甲氧基羰基化合成1,5-萘二氨基甲酸甲酯(NDC)反应中的催化性能。结果表明,六水合硝酸锌和氧化锌等无机锌盐对该甲氧基羰基化反应没有催化作用,而二水合乙酸锌、ZCHBDH以及二水合硬脂酸锌对该甲氧基羰基化反应却有催化活性。当该甲氧基羰基化反应在n(DMC)∶n(ZCHBDH)∶n(NDA)=37∶0.03∶1的条件下于150℃反应5 h,NDA的转化率为100%,NDC的选择性达99%。 相似文献
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以含氨基有机酸和氧化锌为原料,制备了4种含氨基锌盐,对产品进行了分析;以硬脂酸锌做对照物,测试了甘氨酸锌、氨三乙酸锌、对氨基苯磺酸锌、邻氨基苯甲酸锌对PVC的热稳定性能,通过热老化箱实验法、刚果红试纸法对含氨基锌盐及其复配系统进行了综合评价。结果表明,含氨基的锌盐对PVC具有较好的长期热稳定性能,与硬脂酸钙具有较好的协同作用。 相似文献
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Preliminary comparative studies of zinc and zinc oxide electrodes on corrosion reaction and reversible reaction for zinc/air fuel cells 总被引:1,自引:0,他引:1
Even though Zn/air energy system is considered to be a promising power energy source, it has been limited to be applied for an electrically rechargeable system basically due to the problem of the irreversible reaction and the corrosion reaction. In this paper a novel attempt has been made to compare the behavior of zinc electrode with a zinc oxide electrode and a modified zinc oxide electrode containing zinc oxide and lead oxide. The hydrogen overpotential is favorable in the zinc electrode, and the modified zinc oxide electrode shows the improved properties showing the more negative potential than the case of the zinc oxide electrode. Investigations of cyclic voltammogram reveal that the pure zinc electrode is irreversible, while both the zinc oxide and the modified zinc oxide electrodes are reversible. However, as far as dendrite formation is concerned there is no marked improvement in case of the zinc oxide and the modified zinc oxide electrodes. 相似文献
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D. C. Joyce D. G. Edwards C. J. Asher L. C. Bell 《Nutrient Cycling in Agroecosystems》1988,17(3):235-250
Thermoplastic matrix controlled-release (C.R.) zinc fertilizers are produced by extruding a mixture of zinc salt and inert polymer material. Three methods of laboratory evaluation were used to characterize a range of C.R. zinc formulations differing in concentration and nature of zinc salt, carrier matrix, and size. The methods were (i) electron microscopy, (ii) zinc emission into water, and (iii) zinc diffusion in indicator-agar. These methods complemented each other, with electron microscopy elucidating physical features governing zinc release from the fertilizer pellets. Finely divided particles of soluble zinc salt, for instance, were associated with formulations whose release characteristics approached theoretical (time)0.5 -order release kinetics. Apart from zinc particle size, other factors controlling zinc emission characteristics were the type of zinc salt, the zinc loading, and pellet size. Varying the polymer matrix materials had little or no effect on zinc release from the C.R. zinc formulations compared in this study. 相似文献
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Field experiments with wheat were conducted for two years on flood plain alluvial soils to study the effectiveness of soil application of zinc sulphate and zinc oxide at 0, 15, 45, 60, 75 and 90 days after sowing. Yield and zinc uptake of wheat increased significantly with the application of zinc. Delaying the application of both zinc sulphate and zinc oxide up to 45 days of sowing did not adversly affect the zinc nutrition of wheat. However, delaying the application for 75 or 90 days after sowing eliminated the response. Zinc sulphate, when applied within 60 days of sowing performed better than zinc oxide. In a laboratory study, zinc sulphate maintained a higher level of zinc in the soil solution than zinc oxide at least over a 3-week period. 相似文献
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