共查询到20条相似文献，搜索用时 15 毫秒
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Silverman L 《Science (New York, N.Y.)》1944,100(2588):100-101
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田间试验中,经常需要测定许多土壤参数。确定取样数目的传统作法是盲目的,不定量的。本文论述了在确定土壤参数空间独立的前提下,如何经济合理地确定取样数目,并对计算结果的应用范围问题做了讨论。 相似文献
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A guide or template is described which facilitates placing the cylinders on the agar surface in the plate assay of penicillin. The general plan of conducting the assay is discussed and several advantages of the use of the guide are noted. We wish to thank Mr. Albert G. Sterling, instrument maker, for fabricating the guide and the aluminum cylinders. 相似文献
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Kennard EH 《Science (New York, N.Y.)》1918,47(1211):271-272
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Atkinson GF 《Science (New York, N.Y.)》1900,11(268):272-273
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Owen JC 《Science (New York, N.Y.)》1943,97(2508):99-100
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