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S. C. Tiwari 《Biology and Fertility of Soils》1993,16(4):293-295
The effects of fertilization with N, P, K, and organic manure (alone or in combination) on earthworm populations, biomass, and casting activity were measured in a cultivated soil (organic C 1.5%, annual rainfall 2000–2300 mm). These applications of fertilizer caused significant increases in earthworm numbers, biomass, and casts. N alone or in combination with P and K also influenced these earthworm parameters significantly. The inorganic NPK fertilizer in combination with organic manure had a significantly greater effect on earthworm activities than NPK fertilizer alone, and therefore the addition of organic matter appears advisable in order to obtain maximum benefits from NPK fertilizer in this soil. 相似文献
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本文对高速公路桥梁建设中混凝土的浇筑进行了介绍和分析 ,谈了混凝土浇筑原则、混凝土的入模、浇筑混凝土的几种方法等 ,并提出了注意事项。 相似文献
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以铸渗法改善零件表面性能为基础,结合工作研究,评述分析了近年来国内的研究成果,归纳总结了影响消失模铸渗质量的几个主要因素,提出了消失模铸渗工艺今后发展中应当解决的问题。 相似文献
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大型铸件的振动时效工艺参数研究 总被引:1,自引:0,他引:1
振动时效用于降低铸件内应力十分有效,但大型铸件的振动时效参数制定较为困难。使用有限元分析软件ANSYS对床身进行了振动时效模拟,根据模态分析和谐响应分析的结果进行工艺参数制定。生产实践表明工艺参数结果较为合理。 相似文献
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Rings of wire placed on the soil surface of two pastures containing populations of Lumbricidae were recovered after 52 months. They had been buried at the rate of 9–10 mm per year. At a forest site where only Megascolecidae were present there was no burial. At the pasture sites, populations of Lumbricidae in tubes of soil sterilized with methyl bromide 52 months earlier were indistinguishable from those in untreated soils. 相似文献
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宋一萍 《拖拉机与农用运输车》2011,38(4):38-41
介绍西门子PROFIBUS-DP总线在铸造静压线上的实际应用,并通过西门子S7-400的PLC和三菱变频器A7NP通讯卡通讯的实例,来实现网络通讯的功能。 相似文献
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[目的]研究利用植物蛋白制备可食肠衣膜的技术方法,并对蛋白膜理化性质进行分析比较,优选更适合制备肠衣的蛋白膜。[方法]以天然植物蛋白(玉米醇溶蛋白、大豆分离蛋白)为原料,适当加入添加剂甘油、谷氨酰胺转氨酶等,增强延展性和柔韧性,分别采用机械挤压法和流延法制备植物蛋白肠衣膜。以质构仪穿刺数据为评价指标,比较不同工艺条件对肠衣膜强度的影响,并对比2种植物蛋白肠衣膜的理化性质。[结果]谷氨酰胺转氨酶酶解后流延法制备的大豆分离蛋白肠衣膜的蛋白含量、含水率以及穿刺强度分别达到70.2%、11.8%以及0.632 kg,各项指标高于挤压法制备的玉米醇溶蛋白肠衣膜。[结论]大豆分离蛋白较玉米醇溶蛋白更适合制备成肠衣膜。 相似文献
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