查询词典 conduction

On the basis of the current situation and developing trend of modeling methods of DC-DC switching converters discussed, a circuit averaging method is put forward to model nonideal basic converters operating in the continuous conduction mode.

在对 DC-DC 开关变换器建模方法的现状及发展趋势进行深入分析的基础上，提出了一种非理想基本变换器在连续工作模式下的电路平均建模方法。

To clear the melanin conduction channel, Nubia permanent black so that the resulting melanin can be transported up to each of the normal root hair

疏通黑色素传导通道，努比亚永久黑使生成的黑色素可以正常的运达每一根头发

This thesis is divided into six parts. The first chapter is preface, the current status of research in the inverse problems for parabolic partial differential equations is reported; the second chapter is "regularization methods for numerical differentiation and their applications ", in this chapter we investigate many regularization methods from a viewpoint of regularization theory and algorithm, some applications in the inverse problems for parabolic partial differential equations are given; the third chapter is "spectral regularization methods". Based on Fourier analysis, within the framework of regularization theory, we apply the spectral methods to some ill-posed problems. Many numerical experiments are done in order to show the validity of the methods; the fourth chapter is devoted to wavelet dual least squares method and a revised wavelet method; in the fifth chapter,we combine finite difference method with method of lines and apply it to the backward heat conduction problem in time; in the sixth chapter "identification problems for unknown source ", the essence and the degree of two problems related to source identification are pointed out, at the same time, some numerical methods are reported.

本文分为六个部分，第一章前言简要分析了国内外抛物型偏微分方程反问题的研究现状；第二章数值微分的正则化及其应用从正则化理论和算法的角度出发，考察了许多正则化方法，还给出了数值微分在抛物型偏微分方程反问题的一些应用；第三章谱正则化方法是在Fourier分析的基础上，在一般正则化理论的框架下，给出了这种方法在各种不适定问题中的应用，数值实验表明谱方法是有效的；第四章研究了小波对偶最小二乘方法和改进的小波方法；第五章主要研究了有限差分方法结合线方法在时间反向热传导问题中的应用；第六章是未知源识别问题，主要指出了两类未知源问题的不适定程度和不适定本质，同时报告了一些数值方法。

According to thermal conduction theories of anisotropic materials that are irradiated with continuously modulated laser, a photothermal measuring method about the thermal conductivity tensor and the orientation of the principal axis of the conductivity of arbitrarily opaquely anisotropic materials is given based on the theories of So(3) group rotation.

以在连续调制光辐照下的各向异性介质的热传导理论为基础，通过So(3)群转动理论，导出不透明各向异性介质的热导张量和热导主轴方向的光热测量方法。

Through the calculating of doping materials, we can see electrons are easy to transation or transfer, which strengthens the conduction properties of materials. Especially the stability of materials doping with Mn or Al is more strong, and the ionizing energy is more lower. These indicate that the electrons in the outest orbit are easier to lose, that is to say the Li+ ions are easier to imbed into materials. The discharge voltage of material doping with Co decreases, the oxidization of electrolyte is more difficult, and the cycling performance is improved.

通过对掺杂材料的计算可见掺杂后电子更容易跃迁或转移，增强了材料的导电性能，其中掺锰和掺铝的材料稳定性更强，电离能降低，说明失去最外层电子更容易，也就是说锂离子在材料中嵌入和脱出更加容易；掺钴之后材料的放电电压降低，电解液氧化的可能性减小，循环性能得到改善。

The stored electrons are readily discharged on demand upon addition of electron acceptors such as thiazine and oxazine dyes (reduction potential less negative than that of the SWCNT conduction band) to the TiO2–SWCNT suspension.

Kamat强调，只有当半导体颗粒和碳纳米管二者的费米能达到平衡，电子转移才会停止，因此，32个碳原子捕获一个电子是受到系统能量限制的保守估计。

objective:to evaluate junction rhythm and atria pacemaking to show pathway conduction block as successful ablation indicatives applied in avnrt of slow pathway ablation and compare the difference of discharge time and ablation targets to ablation endpoint. methods:153 patients with avnrt were performed slow pathway radiofrequency ablation.

目的：评价以出现交界性心律与心房起搏显示慢径前传导阻滞作为有效消融指标在房室结折返性心动速慢径消融中应用，比较这两种有效消融指标判断方法在慢径消融达到消融终点时的放电时间与消融靶点数的差异性。

Regarding to different successful ablation monitoring indicatives, patients were divided into ablation group in traditional methodand ablation group with atria pacemaking showing slow pathway conduction block as successful ablation indicative.86of groupⅰ presented junction rhythm in dischargeing 15s or early pacemade then consecutively discharged 60～90 seconds; in groupⅱ 67 patients after dischargeing 15s showed junction rhythm or after early pacemaking delayed dischargeing to 20s then stopped dischargeing.

按不同的有效消融判断指标分为传统方法消融组和以心房起搏显示慢径前传导阻滞作为有效消融指标消融组。i组86例在放电后15 s内以出现交界心律或早搏后继续放电60~90 s；ii组67例放电15 s内出现交界心律或早搏后延迟放电至20 s停止放电，以术前av1﹕1最短间期心房刺激（s1s1）显示慢径前传阻滞后停止起搏继续放电至60 s。

The parabolic partial differential equation is an important type of mathematical physical equations. It can describe the problems of heat conduction, seepage flow and diffusion, et al.

抛物型偏微分方程是描述热传导、渗流、扩散等过程的一类重要的数学物理方程。

This article bases on the knowledge of ordinary differential equation, mathematical and physical equations and equation of reactive pervasion. It researches the blow-up critical exponents of heat conduction type which is parabolic equations with nonlinear boundary constraints.

本篇论文以常微分方程与数学物理方程，反应扩散方程的知识为理论基础，讨论了热传导问题的临界指数问题，该问题是一个带齐次边界条件的非线性抛物型问题。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。