minimum n. (pl. minimums, -ma ) 最小,最低,最少限度;【数学】极小(值)。 the irreducible minimum 无法减少的最小限度。 The thermometer reached the minimum for the year. 寒暑表降到当年最低度数。 adj. 最少的,最小的,最低的。 the minimum value 【数学】极小值。
On the basis of contrast maximization autofocusing algorithm ( cma ) , a method based on minimum entropy criteria ( mec ) for sar imagery autofocusing is proposed 在对比度最大化自聚焦算法的基础上,提出了基于图像熵最小准则的自聚焦算法。
In the study of entropy expression of porous media convection - diffusion process , the reason why minimum entropy production principle is uncomformable is analyzed 在多孔介质对流扩散问题的熵产规律的研究中,分析了最小熵产原理在这一问题中的不适应性的原因。
And others are found , and the expression of minimum rate of energy dissipation of flow is re - derived based on the theory of minimum entropy production . ( 2 ) it will be pointed out that the entropy is different from the entropy production in a river system ( 2 )指出河流系统中的熵与熵产生是两个不同的概念,冲积河流在调整过程中,力求使水流的熵产生或能耗率趋于最小值,而不是使熵趋于最大值。
Firstly , the principle of phase gradient autofocus and rank one phase estimate and its advanced are detailed . secondly , it proposes an algorithm of fast maximum contrast phase compensation after discussing its similar algorithm fast minimum entropy phase compensation 讨论了经典的相位梯度自聚焦算法、秩一相位误差算法及其改进形式;在讨论快速最小熵相位补偿算法的基础上,提出了对比度最优相位调整算法,实测数据处理表明了该算法的有效性。
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。
The theory of minimum entropy production or minimum rate of energy dissipation shows that a river is stable when it is in a relative equilibrium condition . ( 3 ) the river facies formulas of alluvial river have been developed using the theory of minimum rate of energy dissipation together with flow continuity and motion equations , suspended load transport or bed load transport equation . ( 4 ) the causes of the river patterns are explained using the theory of minimum rate of energy dissipation ( 3 )基于最小能耗率原理,以水流能耗率作为目标函数,以水流连续方程、水流运动方程及悬移质挟沙力公式或推移质输沙率公式作为约束条件,通过对目标函数求条件极值,分别推导出以悬移质造床为主的显式河相关系式和以推移质造床为主的显式河相关系式。
The two basic theories of non - equilibrium thermodynamics , the minimum entropy production and the dissipative structure , are introduced . it will be shown that , by using the relationship between the entropy production and the rate of energy dissipation , the minimum entropy production is equivalent to the minimum rate of energy dissipation 本文首先介绍了非平衡态热力学的两个基本理论?最小熵产生原理和耗散结构理论,并根据熵产生与能耗率关系,得出最小熵产生原理与最小能耗率原理二者等价的推论。
By analyzing the factors affecting enterprise expansion ratio and redefining the ratio in entropy thinking , the paper points out that expansion must be based on its basic elements of internal strength and weakness such as core competence , and external environment will determine the size of its expansion , speed and scope of the economy in order to achieve the minimum entropy internal and achieve sustainable development , which provides new thinking for expansion strategy and management 摘要通过对影响企业扩张度因素的分析以及熵思想下企业扩张度的重新界定,指出企业扩张必须遵循的原则就是,扩张必须基于自身核心竞争能力等内部基本元素的强弱与外部环境来确定其扩张的规模、速度以及经济范围,以便达到内部熵能最小和持续发展的目的。