查询词典 neutral point

Chapter 3 emphasizes on the case that the considered systems contain not only impulse but also time delay. We mainly investigate impulsive parabolic systems with time delay and neutral impulsive parabolic systems. Section 3.1 discusses the oscillation of impulsive parabolic systems with time delay under Robin boundary condition and obtains some useful criteria via first order impulsive differential inequalities with time delay. Section 3.2 studies the oscillation of neutral impulsive parabolic systems under Neumann boundary condition and Robin boundary condition, respectively, and obtains some sufficient conditions for oscillation and strong oscillation via first order neutral impulsive differential inequalities.

第三章针对于"脉冲"与"时滞"共存的复杂情形，仍采用反证法讨论了含时滞的脉冲偏微分系统的振动理论，具体研究了脉冲时滞抛物系统和中立型脉冲时滞抛物系统。3.1节考虑了脉冲时滞抛物系统的振动理论，借助于一阶脉冲时滞微分不等式的解的性质，得到了满足Robin边界条件的脉冲时滞抛物系统的若干振动准则；3.2节考虑了中立型脉冲时滞抛物系统的振动理论，借助于一阶中立型脉冲时滞微分不等式的解的性质，分别给出了满足Neumann边界条件和Robin边界条件的中立型脉冲时滞抛物系统的若干振动和强振动准则。

In the paper, we mainly study the existence and stability of equilibrium of neutral cellular neural network modeland periodic solution of neutral cellular neural network modelwhich both models are described by nonlinear neutral delayed differential equations.

本文主要研究了由非线性中立型时滞微分方程描述的中立型细胞神经网络模型的平衡点和模型的周期解的存在性及稳定性。

The results show that when the fire located below the neutral plane and the vertical shafts have more openings, the smoke spread upward and was discharged from the upside holes due to the buoyancy and stack effect; when the fire located above the neutral plane, the smoke was discharged from the upside holes and the floors under the neutral plane holding relatively smokeless.

试验结果表明：火源位于中性面以下且开口较多时，由于浮力及烟囱效应的作用，烟气向上蔓延并由上部开口排出；火源位于中性面以上时，烟气由中性面以上开口排出，中性面以下各层保持相对无烟。

Neutral differential equations with variable sign coefficients are separated into neutral differential equations with positive and negative coefficients by transformation. According to the characteristic of these equations, a real number set with supremum is constructed, and sufficient conditions for oscillation of all solutions to neutral equations with variable sign coefficients are obtained.

通过变换将具有变号系数的中立型微分方程分解为具有正负系数的中立型微分方程；分析具有正负系数中立型微分方程的特征，构造存在上确界的实数集；并对中立型微分方程的解作细致分析，得到了具有变号系数中立型微分方程所有解振动的充分条件。

Neutral differential equations with variable sign coefficients are separatedinto neutral differential equations with positive and negative coefficients bytransformation.According to the characteristic of these equations,a real number setwith supremum is constructed,and sufficient conditions for oscillation of all solutionsto neutral equations with variable sign coefficients are obtained.

通过变换将具有变号系数的中立型微分方程分解为具有正负系数的中立型微分方程；分析具有正负系数中立型微分方程的特征，构造存在上确界的实数集；并对中立型微分方程的解作细致分析，得到了具有变号系数中立型微分方程所有解振动的充分条件。

To determine the role of neutral trehalase during storage stability of spores, we constructed a M.anisopliae RNAi transformant and an overexpression transformant. Analysis of these transformants revealed that the expression level of the neutral trehalase gene in RNAi transformant(No 688) was reduced to 50% of which found in wild type and the overexpression transformant(No 113) showed approximatlely 2-fold higher levels of neutral trehalase mRNA than that found in wild-type control.

构建了中性海藻糖酶基因RNA干扰载体和超表达载体，采用电转法和基因枪法转化金龟子绿僵菌CQMa102，获得了RNA干扰转化子和超表达转化子，比较这两种转化子和出发菌株的mRNA表达情况，发现RNA干扰转化子中性海藻糖酶mRNA表达受到抑制，而超表达转化子中性海藻糖酶mRNA的表达量是出发菌株的2倍。

Particularly, the neutral anion fluorescence chemical sensor uses cholic acid molecules as the molecule frame, and introduces a neutral thiourea or ureido to the positions of a 3 bit carbon atom and a 24 bit carbon atom to be used as a bonding unit; a fluorescence chemical functional group is introduced to the positions of the 3 bit carbon atom and the 24 bit carbon atom or to other positions and used as a signal unit, and then a neutral anion fluorescence chemical sensor is synthesized.

具体而言是以胆酸分子为分子骨架，在其3位碳原子和24位碳原子上引入中性硫脲或脲基，作为键合单元；在3位碳原子和24位碳原子上或其他位置引入具有荧光化学官能团，作为信号单元，合成中性阴离子荧光化学传感器。

You can start with the image of neutral grey zone for color cast judgement, and the region as the target tube do with gray scale of neutralized, that is, set the value with a neutral color cast of neutral grey area.

可以不后从图像的洋性灰地区怠工色偏鉴定，并以该地区为标的目的用滴管怠工同灰度级的洋性冻，即用洋性值撤销色偏的洋性灰地区。

The transition dipole moments of neutral and charged Green1 are compared using 3D transition density, which reveal the orientation and strength of transition dipole moments. The charge redistribution of neutral and charged Green1 upon excitation are shown and compared with 3D charge difference density. The electron-hole coherences of neutral and charged Green1 upon excitation are investigated with 2D site representation.

用3D跃迁密度方法对中性和带电的Green1的跃迁偶极矩进行比较，可显示出跃迁偶极矩的取向和强度；用3D电荷差异密度方法显示出激发后的中性和带电的Green1电荷重新分布，也进行了比较：用2D实空间分析方法来研究中性和带电的Green1处于激发态时的电子空穴相干性。

A study on dyeing performance of superfine fiber PA/PU synthetic leather with neutral dyes ;2. Kinetics of ultrasonic dyeing of wool with neutral dyes ;3. Dyeing behaviors of neutral dyes tuffs on supermicro PA/PU synthetic leather are discussed.

采用中性染料对超细锦纶PU合成革染色，通过正交试验优化染色工艺条件：染浴pH值4，染色温度90℃，染料浓度4%~6%，浸染时间80 min，匀染剂用量1。

A historical region of southwest France between the Pyrenees and the Garonne River. The duchy of Aquitaine was joined with France after the marriage of Eleanor of Aquitaine to King Louis VII in1137, but its possession was disputed after her subsequent marriage to Henry II of England.

阿基坦法国西南部一个历史地区，位于比利牛斯山和加隆河之间，在1137年阿基坦的埃莉诺与国王路易斯七世结婚之后阿基坦公国加入法国，但当她再嫁英国亨利二世后，其归属权便受到争议

There are moments when I look at the smiling , happy faces of my expectant staff and wonder how they will cope when confronted by an outraged housemaster along with an unrepentant and recalcitrant bleached blond teenager in 18 years ' time .

有时候，我看着那些满怀期待的员工微笑，幸福的脸，想着当他们遇到一位愤怒的宿舍管理员和一位不知悔改，叛逆，而且将头发染成白色的18岁少年时，他们会如何处理。