查询词典 threshold intensity

Automatic threshold choice is difficult and important to color images edge detection, First of all, on the base of human visual properties, threshold versus intensity function of human visual system are researched and analyzed, by using method of mathematic modeling and the result of saturation research, function of least color difference that can be perceptible by visual systems in detecting edge is given.

摘要自动阀值选取是彩色图像边缘检测的难点和关键问题，首先从人类的视觉特性出发，分析了人类视觉系统的亮度感知门限函数，利用数学建模方法和色度学方面的研究成果，给出人类视觉系统对彩色图像边缘所能识别的最小彩色差函数。

Based on Stuart et al.'s electron density evolution equation, the electron density evolution process in fused silica film irradiated by short-pulse laser for τ∈[0.015] ps were studied by means of numerical method. The effects of initial electron density N and laser pulse width τ on laser threshold intensity I and damage threshold fluence. F were analyzed respectively.

基于STUART等人的电子密度演化方程，运用数值模拟方法，研究了脉宽为τ∈[0.01， 5]ps范围内单脉冲激光作用下熔融石英薄膜中电子密度演化过程；讨论了初始电子密度、激光脉冲宽度对阈值功率密度和阈值能量的影响；分析了初始电子密度、激光脉冲宽度对多光子离化及雪崩离化的影响。

It is presented that indirect assimilation experiment of CMW data from TCFM method improves effectively not only on vertical velocity field but for precipitation.4 Based on theory analysis, E-Ir relationship is brought forward with two electrification mechanisms. One is inductive mechanism, i.e., cloud particles collide with precipitation particles then flick away, the other is noninductive mechanism because of different temperature, i.e., bigger supercooled cloud particles collide and freeze with hail particles combined with ice scraps. By means of CINRAD and FY2C data assimilation, precipitation intensity Ir can be obtained, then electric field intensity E, discharge time and locations can be achieved with supposed threshold 300KV/m. Though it can not distinguish between IC (Intra-Cloud) lightning and CG (Cloud-to-Ground) lightning, results are still comparable to LLS observations.5 Example analysis shows that the relationship between precipitation data from AMS and CG data from LLS is not very clear.

同化实验对于台风眼区的螺旋形雨带贡献显著，说明TCFM云导风资料同化实验不仅有效调整了模式的垂直速度场，还对降水模拟有了明显改善。4通过理论分析，利用云粒子与极化降水粒子碰撞并弹离的感应起电机制和较大过冷云滴与雹粒碰冻并产生冰屑的温差起电机制下得到的E-Ir，由雷达、卫星遥感资料直接和间接同化模拟得到Ir，来反推E，了解雷暴云中闪电强度的平面分布，设置放电阈值为300KV/m，推算出放电的位置和首次发生闪电的时间。

Chapter four studies the chaotic responses in a system consisting of simple pendulum and harmonic oscillator under bounded noise excitation. Firstly, the Melnikov function of the two-degree-of-freedom system under Hamiltonian perturbation is derived. The essential condition of the autonomous system for the probable onset of chaos is obtained, the Poincare maps of the system under small Hamiltonian perturbation and the effect of increasing perturbation on the Poincare maps are studies. Then for the non-autonomous system under damping and harmonic or bounded noise excitation, the largest Lyapunov exponent and Poincare maps are calculated. From the analysis of the largest Lyapunov exponent, the critical criterion for the onset of chaos, and the conclusion that the threshold of bounded noise amplitude for the onset of chaos in the system increases as the intensity parameter of Wiener process increases are obtained. The result from the analysis of Poincare maps is in agreement with that obtained from the Largest Lyapunov exponent. The effect of varying damping coefficient and intensity parameter of Wiener process is also analyzed.

第四章研究了有界噪声激励下的两自由度单摆—谐振子系统的混沌运动，首先推导了该两自由度系统仅在Hamilton扰动下的Melnikov函数，得到该自治系统可能产生混沌的必要条件；研究了该系统在小的Hamilton扰动和增大摄动情形下的Poincare截面；然后对有阻尼、谐和或有界噪声激励下的非自治系统数值计算了其最大Lyapunov指数和Poincare截面；从Lyapunov指数分析得到了这个两自由度系统产生混沌运动的临界条件及产生混沌的临界激励幅值随Wiener过程强度参数值的增大而增大的结论，Poincare截面分析的结果亦符合Lyapunov指数分析的结论；研究了Wiener过程强度参数、阻尼系数变化对Poincare截面的影响。

RS comply with the special growth law,does not have" threshold "characteristics.lt depends not only on the intensity of pump beam but also on the intensity of Stokes beam itself.

tokes束的增长不仅依赖于泵浦波的强度，而且也和自身的强度有关系。

We studied the effect of the coupling strength between the emission dipole and the electric field of the cavity on the emission intensity for the first time, and found that when the emitter located at the antinode of the electric field of the cavity the PL intensity reached its maximum, while at the node of the electric field the PL intensity reached its minimum.

通过理论推导确定了金属穿透深度和反射相移的表达式，并设计腔长为λ／2的对称金属镜腔结构，通过改变金属的厚度得出不同厚度金属的穿透深度，与我们给出的公式的结果基本一致，从而为精确地设计微腔器件提供了理论指导。

Analyses Ⅲ crack creep fracture under the influence of the initial co_linear array of microcracks antiplane using macrocrack_microcrack inteaction model and the theory of stress intensity factors for creep fracture,and presents the relation between the concrete antiplane Ⅲ crack stress intensity factors for creep fracture and the initial stress intensity factors was obtained.

依据宏观裂纹—微裂纹相互作用模型和蠕变断裂应力强度因子理论，对具有初始等距共线微裂纹列影响的反平面Ⅲ型裂纹体的蠕变断裂问题进行了分析。

At 0-60 ℃, the maximum fluorescence intensity of GCS-EPF decreased on heating and the relationship between fluorescence intensity and the change of temperature was linear; At pH=0-13.5, its fluorescence intensity increased with basification and completely disappeared at very acidic pH.

结果表明，修饰后水溶性壳聚糖的水溶液、固体粉末和薄膜在520 nm附近具有较强的荧光发射，其荧光强度不仅在0-60 ℃时对度有较快敏感响应，同时在pH=0-13.5时对pH也有较快敏感响应，具有双重敏感响应，因此可将其作为温度荧光探针和pH荧光探针的高分子材料。

Luminous intensity: the light source in a given direction within a unit solid angle as the light source luminous flux launched at the direction of the luminous intensity, or light intensity, I used to that unit candela.

发光强度：光源在某一给定方向的单位立体角内发射的光通量称为光源在该方向的发光强度，简称光强，常用I来表示，单位为坎德拉。

To measure, calculate, display, print sound intensity sound pressure, sound power, three dimensional sound intensity spectrum, equal intensity contour are all deeply studied.

本文就声强、声压、三维声强谱、等声强线以及A计权、1/3倍频程的测量、计算、显示、打印等进行了深入的研究，并编制了一整套运行于Windows平台的图形化多文档界面声强测量分析软件。

Liapunov—Schmidt method is one of the most important method in the bifurcation theory.

Liapunov—Schmidt方法是分叉理论的最重要方法之一。

Be courteous -- even when people are most discourteous to you .

要有礼貌──即使当別人对你最不礼貌的时候。