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排序方式: 共有178条查询结果,搜索用时 15 毫秒
171.
Virk S. S. Porter W. M. Li C. Rains G. C. Snider J. L. Whitaker J. R. 《Precision Agriculture》2021,22(3):777-799
Precision Agriculture - Maintaining adequate planter downforce is critical for achieving timely and uniform crop emergence across the field. On-farm research studies were conducted in different... 相似文献
172.
Whitaker BJ 《Science (New York, N.Y.)》2011,334(6053):187-188
173.
174.
A bright noctilucent cloud was observed and photographed north-west of Tucson on 15 June 1963. Results of computations indicate that the cloud was at a height of 71 kilometers. The cloud appears to have resulted from the launching of a Scout space vehicle. 相似文献
175.
Shoemaker EM Batson RM Holt HE Morris EC Rennilson JJ Whitaker EA 《Science (New York, N.Y.)》1967,158(3801):642-652
Surveyor V landed in a small crater, 8.5 meters wide and 12.5 meters long, which was probably formed by drainage of surficial fragmental debris into a subsurface fissure. The lunar surface debris layer is exposed in the walls of this crater. At depths below about 10 centimeters, the debris appears to be composed mainly of shock-compressed aggregates, ranging from a few millimeters up to 3 centimeters in diameter, set in a matrix of less-coherent finer particles. Rocky chips and fragments larger than a millimeter are dispersed as a subordinate constituent of the debris. 相似文献
176.
177.
Donald B. Bechtel Jeff D. Wilson W. D. Eustace Keith C. Behnke Thomas Whitaker Gary L. Peterson David B. Sauer 《Cereal Chemistry》1999,76(2):270-275
Wheat contaminated with teliospores of Tilletia controversa Kühn (TCK) was mixed with uncontaminated wheat and processed through the Kansas State University pilot mill. Two 50-bu lots of the contaminated mixture were cleaned, tempered, and milled. Approximately 500 samples of wheat, cleanings, and mill fractions were collected and examined for the presence of intact and broken TCK teliospores. Whole wheat samples (50 g) were washed, sieved through a 60-μm nylon sieve, and pelleted by centrifugation. Contents of the pellet were examined microscopically for the presence of TCK spores. The procedure was modified as needed to accommodate cleanings and mill fractions. Levels of spore contamination in whole wheat samples decreased at each step during the handling process, and large numbers of spores were found in materials that were sieved or aspirated from the grain. Very few spores were found in bran, germ, and shorts; none were detected in red dog or straight-grade flour. The results showed that a high percentage of spores can be removed from wheat by mechanical cleaning but that it is not feasible to remove all of them. 相似文献
178.
Volume is an important characteristic in the evaluation of cakes and cake quality, relating to the underlying structural development of the cake. A method for evaluation of changes in contour and volume during the cake baking process is proposed: the height profile method. Volumes of baked cakes were determined using two standard methods, rapeseed displacement and cross‐sectional tracings, and compared with height profile analysis to determine the accuracy of the new method for cake volume analysis. Height analysis values did not significantly differ from rapeseed and tracing results. The height profile method was used to analyze and calculate changes in volume during the baking process for cakes made with chlorine‐treated and nonchlorine‐treated flours. The method was also able to depict changes in contour of the baking cakes, showing definite differences in contour development between chlorine‐treated and nonchlorinetreated flours. The height profile method of volume determination is a nonintrusive method that can be employed in the study of volumetric and contour changes of cakes while they bake. 相似文献