上微分

For the model with the recruitment part governed by Ricker\'s function, we analyze the stability of the positive equilibrium.

得到了疾病的基本再生数R_0，其计算过程比一般的微分方程模型更为复杂，这是因为此时无病空间上的吸引子可以是平衡点，也可以是周期解或者奇怪吸引子。

After spraying the fermentation supernatant of endophytic actinomycetes GKSHJA and PR1-8, the impact of the endophytic actinomycetes against Sphaerotheca fuliginea histomorphology were tested by the differential interference, and the enzyme activity of POD, SOD, PAL on cucumber leaf treated by spraying endophytic actinomycetes were tested by the spectrophotometer.

对喷施内生放线菌GKSHJA及PR1-8发酵上清液处理后采用微分干涉的方法观测生防菌对白粉菌的组织形态学影响，利用分光光度计测定喷施发酵液后黄瓜叶片内POD、SOD、PAL酶活变化。

A new PID algorithm which combines improved discretely integral PID and inadequacy differential PID,makes the system stabilitate faster and exacter.

控温电路采用线性化电流方式，算法上对积分分离PID算法做出改良，并与不完全微分PID算法结合形成一种优化PID算法，能快速、精确的把温差稳定到目标值，控温精度达到0.01℃。

The aim of this thesis is to study the existence of positive solutions of boundary value problem for nonlinear second order ordinary differential equations , mainly using the fixed point index theory in a cone. The conditions of the existence of positive solutions of the boundary value problem are given in the thesis. We improve the result of the existence of positive solutions either in the sublinear or in the superlinear conditons.

本文主要利用锥上不动点指数定理，解决非线性二阶常微分方程边值问题的正解的存在性问题，并给出了边值问题正解存在的条件，改进了次线性和超线性条件下正解存在的结论。

When these parameters surpass a certain value, the system cannot appear the limitcycle. Through the various parameters\' changing, it demonstrates the forming process of the dissipative structure. Thus it show the dissipative structure\'s characteristic of the trophodynamics predation model and point out the ecological significance of the various parameters in the model.On the fourth chapter, the spruce aphides and its predator model is a predator model.

第四章，以两个捕食者作用于同一食饵的竞争关系模型为例，应用微分方程定性理论，对捕食模型中存在极限环的情况进行了讨论，用MATLAB在相平面上模拟出系统的极限环，此时该体系状态的发展呈现周期振荡趋势，从而揭示出营养动力学为基础的捕食模型耗散结构特征。

Compared with the method of Lg[N00-N], the method of Lgderivative is more accurate. A simple and flexible signal source of multiple decay was designed with the linear adding of many RC charging signals. Two suits of multiple decay data which are acquired independently over a 10th order time span indicate that, the shape of the Lg derivative peak is coherent with its theoretical peak unitarily.

独立进行的两组不同的10 个时间数量级的数据都表明，复杂衰减过程的实验数据的K-Lg微分峰形曲线，与以各元件RC 值计算出的衰减寿命值和测量各单一充电过程的衰减量实验数据为参数，再由理论公式产生的曲线比较，两者在曲线整体形状上有很好的一致性。

As MEMS (Micro Electro-Mechanical Systems) technology progresses rapidly, the synergism between MEMS and biomedical technology becomes closer than ever before. When the uTAS was introduced in the last two decades, many microfluidic chips, microelectrodes, and microreactors are being studied for drug detection, environment detection, gene analysis etc. Due to its small volume, low pollution, low consumable and good portability, uTAS plays a very important role in biomedical, biochemical, environment engineering fields.

随着MEMS(Micro Electro-Mechanical System，微机电系统)制造技术的不断发展，生物医学与其之间的联系越来越紧密，自上世纪90年代初提出uTAS(Micro Total Analysis System，微全分析系统)之后，各种各样的微流控芯片、微反应器、微电极、微分离器等便大量涌现，广泛应用于药物检测、环境监测、基因分析等诸多领域中，并且由于其试剂消耗量少、检测效率高、环境污染小、体积小、易于携带等优点，在生物医学、化学、环境工程等领域受到越来越多的重视。

The electrochemical behavior of bumetanide was studied by differential pulse voltammetry method.The differential pules voltammograms exhibited an oxidation current peak of bumetanide at the potential of +0.896 Vvs.

用微分脉冲伏安法研究了利尿剂类药物布美他尼在玻碳电极上的电化学行为。

Articles could no longer be understood with one quick read-through; derivatives and integrals could not be simply memorized and recited; and skimping on homework meant sacrificing the learning of crucial skills as well as points on exams.

迅速浏览不能够懂得文章，微分和积分不是考记忆就可以重复使用的，在家庭作业上的缺斤少两直接导致了我没能掌握到关键的知识，也没能在考试中取得好成绩。

The equation of ESCDAC is presented. Secondly, Based on this equation and the independent characteristic of observation valves, the ESR of the azimuth measurement error is presented by full - difference of the measurement equation which acts as the precision of ESCDAC.

然后以该方程为基础，根据该方程中各个观测量相互独立的特点，方位测量误差的均方根值可由测向方程的全微分求得，并将其作为电扫描恒差比幅测向的精度，由该精度公式可以看出，电扫描恒差比幅测向有很高的精度，并且在不同的角度上，其精度保持稳定。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。