捕食

According to the change of the enemy\'s quantity and the qualitative theory of the differential equation, we research the spruce aphides and its predator system. At the same time, we discussion the spruce aphid multiplication model when the natural enemy quantity is a certain value and the periodic oscillating model whose the quantity of the natural enemy changes along with the time. Obtains the stability condition of the balance point and the limit-cycle existing condition, the system presents the dissipative structure\'s character. Finally it explains that this theoretical analysis has certain practical significance regarding the preventing and controlling harmful insect.

第五章，松毛虫与其天敌的关系是食饵和捕食者的关系，根据天敌数量的变化，利用微分方程定性理论，研究松毛虫与天敌系统，讨论天敌数量为一定时的松毛虫增殖模型和天敌数量随时间变化的周期振荡模型，得到正平衡点全局稳定性和极限环的存在条件，通过计算机模拟，说明周期振荡的捕食模型能够呈现典型的时间耗散结构特征，对于防治害虫有一定的实际意义。

We proposed and analyzed a class of Lesli predator-prey model with mutual interference and obtain global asymptotic stability of positive equilibrium point for the model by using the theory and method of stability.

建立并分析一类具有相互干扰的Leslit捕食与被捕食模型，运用稳定性理论及方法得到了该模型正平衡点的全局渐近稳定性。

It is said that millions of sardines migrates from cold sea area for spawn in Capetown to the east for zooplanktons to prey. However, what wait for them are armies of predators, including of porpoies, doradoes, sharks, sea dogs and whales. Some solans and sea-gulls also dive into the sea to attempt to prey sardines, but sometimes they themselves become victims of sharks.

据悉，每年数以百万计的沙丁鱼将从开普敦较冷的产卵水域向东迁徙寻找浮游动物为食，然而等待它们的却是一群猎食大军，其中包括：海豚、剑鱼、鲨鱼、海豹和鲸，在水面之上还有塘鹅和海鸥盘旋着，试图寻找机会潜入水中捕食沙丁鱼，但有时潜入水中的鸟类也会成为鲨鱼的捕食对象。

In chapter 3,by means of Comparison Theorem,we investigate the persistence of a prey-predator system with diffusion and delays .

在第二章，我们运用独立子系统方法考虑了一类具有生理阶段结构的竞争捕食-被捕食系统正周期解的存在性及其全局吸引性。

This paper includes four chapters,the first part is an introduction,the second part is concerned with the state of construct and improvement about the predator-prey sys-tem,the third part is concerned with the state of research about the predator-prey system. Some new directions of predator-prey system are introduced in brief in the fourth part.

本文共分四部分：第一部分是引言；第二部分介绍了捕食者-食饵系统的建立和发展现状；第三部分系统的阐述了捕食者-食饵系统的研究情况；第四部介绍了捕食系统的一些其它的研究方向。

According to the predacity of the nematode-trapping fungi and the growth habit of pine wood nematode Bursaphelenchus xylophilus, this paper tested the B. xylophilus that cultured by the fixed time and quantities. Trying to find out the quantificational test method of trapping rate, by the change of the quantities of B.

本文依据捕食线虫真菌的捕食特性以及松材线虫的生长习性，对松材线虫进行了定时、定量的测定试验，试图通过培养后线虫的种群数量变化，来摸索定量测定捕食率的方法。

The tigers usually prey on deer, tapir, fish, and also farm animals and sometimes in a very unfortunate situation, also human.

这种老虎通常捕食鹿，貘和鱼，现在也捕食家畜，有时候在十分不幸的情况下捕食人。

The former' wave width is medium. It feeds mainly on aquatic small insects of order Diptera and Trichoptera, foraging in 5-20cm above water surface and midium- complicated forest by trawling and aerial feeding. The latter's wave width is shortest, which have disadvantage to discriminate targets from enviroment. It feeds mainly on even smaller insects of order Lepidoptera and Diptera, foraging in wide space or sparse-foliage forest by aerial feeding.

为小型蝙蝠，前者声波带宽中等，主要以水生小型的双翅目、毛翅目为食，在水面5—20cm和中等复杂的林中进行拖网和空中捕食，后者声波带宽最窄，主要以小型的鳞翅目、双翅目昆虫为食，在开阔空间内或稀疏林中进行空中捕食，视觉可能在捕食中具有重要的辅助作用。

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。

In this paper, we consider stage-structured predator-prey models with general functional response of predator and with prey using hawk and dove tactics.

本文主要考虑了捕食者具有一般性功能反应的阶段结构捕食模型以及阶段结构捕食模型中食饵采取鹰鸽对策的问题。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。