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运用比较分析法、调查法等科学研究方法,对木材、竹材、金属、塑料4种材料的成型加工特性、连接工艺特性、表面处理特性进行了整合,对比了4种材料加工特性的优劣势,分析了4种材料加工特性在家具设计中的运用,最终验证了掌握材料加工特性是实现家具产品造型理想效果的前提与保障,为利用材料加工特性进行家具设计提供参考。 相似文献
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北五味子成花特性的研究现状及展望 总被引:1,自引:0,他引:1
对北五味子的成花特性研究现状进行了较系统的阐述 ,并结合相关领域不同树种成花特性的研究现状 ,分析了北五味子成花特性研究的不足 ,为北五味子成花特性的进一步研究及解决生产中存在的问题 ,提出一些看法。 相似文献
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本论文探索了一条确定缓冲特性方法的新途径,通过测定缓冲材料的静态特性与一次动态;中击数据为基础,建立数学模型,利用最小二乘法进行误差分析,并使用Madab/Simulink软件仿真出缓冲特性曲线。这种方法得出的缓冲特性曲线准确性高、试验周期短,待理论成熟必将成为今后缓冲材料特性测试的主要方法。 相似文献
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系统调查观光桃园昆虫群落结构及其优势种的时空生态位并进行测定.结果表明:昆虫群落结构丰富,桃园有昆虫9目25科34种,桃蛀果蛾、梨小食心虫、桃蛀野螟、桃潜蛾、桑白盾蚧、桃蚜、小花蝽、异色瓢虫、黑带食蚜蝇、叶色草蛉、黑缘红瓢虫等是桃园昆虫的优势种.昆虫群落物种数、个体数、多样性指数、均匀度指数随时间变化而波动.生态位宽度在害虫亚群落中为:桑白盾蚧>桃蚜>桃潜蛾>梨小食心虫>桃蛀野螟>桃蛀果蛾,天敌亚群落中为:黑缘红瓢虫>异色瓢虫>黑带食蚜蝇>叶色草蛉>小花蝽.黑缘红瓢虫与害虫的生态位重叠值均较大,而且与桑白盾蚧在时间上的同步性和空间上的同域性均优于其他天敌,是桃园天敌的优势种群. 相似文献
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对受红腹柄天牛不同危害程度的罗浮栲韧皮部和木质部中可溶性糖含量进行测定,分析可溶性糖含量与红腹柄天牛危害之间的关系。结果表明:在天牛取食活动期,不同受害程度罗浮栲的韧皮部和木质部可溶性糖含量差异明显,尤其韧皮部的变化比木质部更加强烈;受害初期的植株,可溶性糖含量与未受害相比显著减少,冬季当幼虫和成虫进入休眠期后,不同受害程度罗浮栲韧皮部和木质部中可溶性糖的含量与未受害植株相比差异程度趋向缓和。表明可溶性糖含量可作为监测罗浮栲植株受红腹柄天牛为害程度的参考。 相似文献
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In the present study, the suitability of different predatory bug species, such as Dicyphus tamaninii Wagner, Macrolophus pygmaeus (Rambur), Orius albidipennis Reuter, Orius majusculus Reuter and Orius sauteri Poppius, for the biological control of Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae), were investigated. Development of the predatory bug species, their reproduction as well as their daily and total prey consumption over a 18-day period with F. occidentalis larvae or various stages of Tetranychus urticae Koch (Acari: Tetranychidae) individuals as prey species were studied during the experiments in the laboratory. In further experiments, the efficiency of D. tamaninii, M. pygmaeus, O. albidipennis and O. majusculus in controlling F. occidentalis under glasshouse conditions was investigated. Results showed that all the predators could develop under the experimental conditions with either F. occidentalis larvae or different stages of T. urticae as prey. When F. occidentalis larvae were offered as prey, the shortest duration of development was observed for O. albidipennis with a mean of 17.7 days, while D. tamaninii took the longest to develop with a mean of 36.3 days. With different stages of T. urticae as prey, the duration of development ranged from 19.3 days in O. albidipennis to 42.9 days in M. pygmaeus. Mean daily fecundity ranged from 0.8 eggs/female for O. majusculus to 2.2 eggs/female for O. sauteri with F. occidentalis larvae as prey and from 0.6, O. majusculus, to 2.3 eggs/female/day, O. sauteri, when different stages of T. urticae were offered as prey. Over the 18-day reproduction period, O. sauteri was the most fecund predatory species, laying a mean total of 31.6 and 31.3 eggs/female with F. occidentalis and T. urticae as prey, respectively. Daily consumption from F. occidentalis larvae ranged between 5.5 individuals consumed per day by O. majusculus and 29.1, by O. sauteri. When different stages of T. urticae were offered as prey, maximal consumption was observed in D. tamaninii with a mean of 29.0 individuals/day, while O. albidipennis consumed the least with an average of 8.1 preys/day. Over the 18-day prey consumption period, D. tamaninii consumed the highest mean number of 422.8 F. occidentalis larvae, while O. majusculus only consumed 98.8 larvae. Also, D. tamaninii had the maximum consumption of different stages of T. urticae with a mean of 522.4, while M. pygmaeus and O. albidipennis consumed the least, with an average of 146.1 and 146.0, respectively. The predatory bugs D. tamaninii, M. pygmaeus, O. albidipennis and O. majusculus significantly reduced the density of F. occidentalis on hybrids of Euphorbia milii, Serissa foetida and Saintpaulia ionantha in the glasshouse, which confirms their efficiency against this pest on different hosts under controlled climatic conditions. 相似文献
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针对哈尔滨市南岗区果戈里大街的路面设计、施工状况的调查,分析了沥青路面裂缝原因与几个因素的关系,并结合有关资料提出一些防治措施。 相似文献
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科技论文写作基本规范 总被引:3,自引:0,他引:3
针对《经济林研究》部分来稿中存在的论文基本要素不全、论文层次划分和编排方法不符合规范要求、计量单位使用混乱、参考文献著录不规范的问题,介绍了科技论文写作中的相关国家标准和规范,并做了部分实例示范。 相似文献