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Differential coefficient and difference simulation equation of gray model GM (1, 2), representing the relationship between 28d compressive strength and 4-32μ m particle content respectively is
颗粒粒级范围对强度的灰色系统关联度分析结果表明:对于普通硅酸盐水泥,4-8μm颗粒含量对水泥3d抗压强度的影响最大,8-16μm颗粒含量对水泥28d抗压强度的影响最大,对水泥90d抗压强度,则16-24μm颗粒的影响最大。28d抗压强度与4-32μm颗粒含量灰色模型GM(1,2)的微分方程和差分模拟式分别为
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The following conclusions have been made in this paper.(1) Based on CO_2 flux data of eddy covariance, variation characteristics of gross primary productivity in four flux observation stations were studied, which are an alpine meadow, an alpine shrub meadow, a swamp alpine meadow and a steppe alpine meadow at Dongxiong. The results show that photosynthetic capacity of the alpine meadow is the highest, and the annual total GPP is 652.2g C/m~2. Daily-differencing approach is used to analyze the random error of CO_2 fluxes measurements. The results show that the distribution of random error follows more closely follows a double-exponential, rather than a normal distribution, capturing the high peak and thick tail, and the random error varies with environment variables, which violates the assumptions for the ordinary least squares fitting with normality and homoscedasticity, consequently, we introduce maximum likelihood method for parameter optimization.
本文主要在以下几个方面开展工作并获得了一些认知和结论:(1)通过分析样带区域内高寒草甸、高寒灌丛、沼泽化湿地和草原化高寒草甸四个通量观测站点草地生态系统总初级生产力变化特征,研究结果表明HBBT矮嵩草草甸生态系统植被光合作用能力较强,年GPP总量为652.2 gC/m~2,明显高于其他三种生态系统;通过利用"单塔日变化法"获得四站点通量观测数据随机误差,结果表明通量观测随机误差概率分布呈现尖峰厚尾的特征,与正态分布相比,更服从双边指数分布,进一步分析表明通量观测随机误差随环境变量(风速、温度和光合有效辐射)的变化而变化,这违背了普通最小二乘法进行生态过程模型参数优化正态分布且误差同质的假设,因此本研究中引入最大似然法进行生态过程模型参数优化。
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The paper introduced the working principle of flatness signal measurement on pneumatic flatness measuring roller, developed a flatness pattern recognition system by virtual instrument LabVIEW, which was made up of polynomial least square method, orthogonal polynomial least square method, fuzzy pattern recognition based on Euclidean distance.
介绍了气动板形检测辊的板形信号检测原理,详细阐述了普通多项式最小二乘法、正交多项式最小二乘法和基于欧氏距离的模糊模式识别法,利用虚拟仪器LabVIEW软件开发了基于上述三种方法的板形模式识别系统。
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As far as the seven kinds of interpolation approaches are concerned,the precision of ordinary Kriging method is the best one,and the error of statistical model is relatively high,of which the relative error reaches to 9.041%.
在7种插值算法中,采用指数模型模拟半异矩的普通Kriging法计算精度较高,统计模型的误差最大,其最大相对误差为9.041%。
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There was big difference among the 22 different materials in the disease resistance. Translocation lines Pm97033 showed the highest resistance in reaction than others. The percentage of diseased root and severed level were 11.3% and 5.4%; substitution lines Wan7107 showed medium resistance to the fungus, the percentage of diseased root and severity level were 21.4% and 10.6%; F5 generation of common wheat with Till showed higher resistance to take-all fungus than the PS progenies of common wheat with Aegilops tauschii or the other common wheat varieties.
菌饼+菌粒法对宁春4号的致病力明显高于菌饼法和菌粒法,其病根率、严重度和病茎率分别达到100.0%,57.3%和28.6%。22个遗传背景不同的小麦材料间抗病性差异较大,其中小麦-簇毛麦易位系Pm97033的抗病性最强,病根率和严重度分别为11.3%和5.4%;代换系Wan7107次之,病根率和严重度分别为21.4%和10.6%;硬粒小麦-簇毛麦双二倍体(TH1)与普通小麦品种杂交后代的抗病性强于粗山羊草与普通小麦品种杂交后代。
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The subject of this study is mainly to investigate the effect of improving the property of common asphaltic mixture when an appropriate amount of waste rubber powders are added on resisting low temperature cracking with the split cylinder test, the little beam bending test, the bhringkage test and unconfined compressive stress test of laboratory-compacted specimens.
本研究主要应用劈裂试验,小梁弯曲试验,收缩试验和无侧限抗压试验考察了在普通沥青混合料中掺适量废胶粉后对低温抗裂性能的改善效果。试验结果表明:掺3—5%的废胶粉,可以降低沥青混凝土的低温弹性模最和增大其变形均达1—3倍,玻璃化转变温度也比普通沥青乱凝土的低10℃以上。
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Level 4 - Regenerates 40% of the dying hero's max hp. 20% for creeps.
四级 -恢复的生命为所杀英雄最大生命的40%所杀普通单位最大生命的20%。
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Level 2 - Regenerates 20% of the dying hero's max hp. 10% for creeps.
二级 -恢复的生命为所杀英雄最大生命的20%所杀普通单位最大生命的10%。
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Ruili, the first step to achieve a leading readers earliest release, the latest and most abundant, the most accurate information to the pop, urban women's clothing to take to the streets to buy the best guide; Ruili not only favor those identikit Beautiful women are more concerned about looks ordinary but many inner-rich ordinary readers and provide them with cover the beauty of deficiencies in our own guidelines, the proposed use for their own mix of programs, refining them by a novel charm
瑞丽率先做到领先一步向读者发布最早、最新、最丰富、最精准的流行资讯,成为城市女性上街购衣的最佳指南;瑞丽不仅青睐那些容貌靓丽的女性,更关注众多相貌平常而内心丰富的普通读者,为她们提供弥补自身不足的美丽指南,建议她们采用适合自己的搭配方案,提炼她们由内而外的魅力
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Comparison between the stress of swirling and common jet nozzle tells that the former maximum stress is far larger that the latter. It can explain that the wear of swirling jet nozzle is more severe than common jet nozzle. The way how various parameters effect the wear of the nozzle is carefully studied in the article.
对比了旋转磨料射流喷嘴和普通磨料射流喷嘴的应力情况,结果表明:前者的最大应力远大于后者,这可以很好地解释旋转磨料射流喷嘴比普通射流喷嘴磨损严重的现象。
- 推荐网络例句
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I didn't watch TV last night, because it .
昨晚我没有看电视,因为电视机坏了。
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Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.
今年以来,在北京的很多小区里,电梯液晶电视被撤了下来。
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I'm running my simile to an extreme.
我比喻得过头了。