- 名词
[农业] (土壤适合种子发芽和作物生长的湿度) moisture in the soil 短语和例子
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墒的英文
例句与用法
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- Due to the short distance among the planes which fly in a group , the conventional low resolution radar can not distinguish them in both distance and azimuth ? if we use the technology of isar to resolve the difference among doppler frequency of the targets and obtain a fine resolution cross - cross image , we may separate them , but a long time of coherent processing is needed < , for the formation targets , it can be approximately divided to rigid body and nonrigid body , so for the formation targets , that can be regarded as rigid which has a relative position and an identical movement , can be approximately considered as a large target , and be compensated by translational phase with the rule of minimum entropy , but for the most those cannot accord with the approximation of rigid , being the doppler - frequency of the aim is linear changed , by the relax method with short data , increases the resolving performance of multiple target to the aim in the frequency domain , since cross - range resolution is based on the accumulative time , so it is greatly improve the resolution to formation targets by the instant cross - range image which produced by radon - wigner transformation
低分辨isan成像及干涉技术应用研究一因此直接无法分辨编队目标的架数，我们借鉴isar的技术，通过较长时间的相干积累，在多普勒频域上对目标进行分辨。而对于编队目标，可分为近似刚性的多目标和非刚性的多目标，所以对于可以近似为刚体的编队目标相对位置固定，运动方式一致，可以近似看作一个大目标，采用最小墒准则对平动相位的进行补偿，但是大多数并不满足刚体近似的编队目标，由于目标在相干积累时间的多普勒频率近似呈线性变化，通过对较短数据利用relax的时频分析方法，提高了频率域上目标分辨的性能。由于横向分辨率取块于横向积累时间，所以利用radnwigner变换得到瞬时的一维横向距离像大大提高了对编队目标的分辨，对仿真和实测数据的大量分析结果表明此方法的有效性和可行。 - 2 . defining the entropy space of image and entropy difference , the concept of information entropy is applied to image retrieval . some mathematical properties of entropy are studied , and similarity measurement of image entropy and corresponding algorithm is presented . these techniques can reduce the dimensionality of histogram space from n to l ( n > l ) , increase the image retrieval efficiency , and improve the capability of image retrieval system
将信息论中的信息熵概念引入图象检索，定义了图象墒空间、熵差的概念，研究了图象熵的性质，探讨了基于图象熵的相似性度量方法和实现算法，该方法可将n维直方图空间变为1维，提高了图象检索的效率，改善了图象检索系统的性能。 - It was found : 1 ) the film restrained evaporation surface intensity and had obvious function of rising and keeping moisture , 2 ) the drip irrigation could supply water according to growing requirement and augment of water conflux intensity around crop root , it also had strongly controllable operation and wasted fewer water
覆膜抑制了土壤表面的蒸发面汇，具有明显的提墒保墒作用，滴灌能随时根据作物生长需要及作物根系汇流强度的增大而补充汇流源，可控性很强，水的浪费率很低。 - This experiment was designed according to the special soil moisture in the north in china as well as the different water requirements in the different growth periods of the maize . the author put forward a practical technique by comparing the water - supply conditions in the different periods of time and ensuring the growth target and the yield target under the best water - supply condition
针对北方旱区土壤水分运动存在冬季缓慢散墒、春季进入强烈跑墒期以及玉米在不同生长期需水差异这一特点，试验设计提出了节水渗灌这一技术的田间试验方案，比较不同时期的供水状况，最后确认在最佳的供水条件下的玉米生长指标及产量指标，提出一套较实用的玉米渗灌节水生产技术。