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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。

First, mathematical foundation of synchronization, i.e. the theory of parameter estimation is introduced. Then, DA/DD or NDA timing synchronization methods based on the ML estimation of timing parameter are presented. They are all widely applied in actual digital communication systems. Interpolation theory in digital signal processing has application in timing synchronization, which makes the sampling clock independent of the timing control so that timing adjustment is realized completely through digital disposal. The issue of interpolation in timing synchronization is discussed.

首先,介绍了定时同步实现的数学基础,即信号参数估计理论;从定时参数的最大似然估计出发,介绍了基于数据辅助的定时同步方法和基于非数据辅助的定时同步方法,他们在实际的数字通信系统中均有广泛应用;论文探讨了数字信号处理中插值理论在定时同步中的应用,它使得接收端的采样时钟独立于定时控制,定时调整完全通过数字处理方法得以实现。

For example,speaking 555 timer flakes and intergrated operate amplifier CA3140 to control,it is a normal thing that the timer is coming out,But today this timer adopt 555 timer oscillatory circuit as at time base signal pulse input,choise magnificated intergrated flake CA3140 to manger ,make the timing of 555 steady state time lagmay be increase one hundred multiple.

由于集成块集成度高,功能强,功耗低,速度快,价格便宜,实用灵活,开发周期短等优点,从上个世纪开始,随着各种各样的集成芯片的问世,比如说555定时器芯片和CA3140集成运算放大器芯片,定时器的形成已经是很普通的事情,但今天这个定时器采用555定时器振荡电路作为时基信号脉冲输入,选择可放大的集成运算放大器3140控制器,使555的稳态延时范围可以增加100倍。

One of the wine regions to have developed this century is just eight degrees south of the equator, in northern Brazil, in what is, basically, tropical desert where vines would be expected to stand no chance but, thanks to cunningly timed irrigation from the nearby S?o Francisco river, are tricked into two full growing seasons a year, thereby halving production costs per bottle.

本世纪已经开发出的葡萄酒产区之一就位于南纬8度巴西北部,在这片基本上属于热带的沙漠里,人们想不到葡萄在那里有生存的希望,但来自附近圣弗朗西斯科河定时的灌溉,使得这里每年有两个完整的葡萄生长季节,这令每瓶葡萄酒的成本降低了一半。

When outdoors, children must use a waterproof, sweatproof sunscreen with an SPF of at least 30 that blocks both UVA and UVB all of the time; reapply often. Wear a hat with a wide brim and cover arms and legs with a lightweight layer of clothing.

在户外时,SLE的孩子必须使用含有SPF 30以上防水防汗的防晒霜,来阻绝阳光中的UVA及UVB,不定时的补擦防晒霜是必须的,但同时间也别忘了戴寛边帽及穿著轻薄的衣服来覆盖手臂及腿。

Revenue for retail packaged products, products licensed to original equipment manufacturers, and perpetual licenses for current products under our Open and Select volume licensing programs generally is recognized as products are shipped, with a portion of the revenue recorded as unearned due to undelivered elements including, in some cases, free post-delivery telephone support and the right to receive unspecified upgrades/enhancements of Microsoft Internet Explorer on a when-and-if-available basis.

零星打包产品,授权给配套供应商的产品,在开放选择项目下批量永久授权的当前产品的收入一般被认为是已发出/提货产品的收入,在有些情况下,部分已记收入由于非交付原因不能实现,非交付原因包括:免费的发运后电话支持和IE非定时的升级。

Programmers need to learn to think like security professionals, to some extent, so that their influence on the architecture of the software they develop will tend toward greater security; network administrators and architects need to learn such skills to ensure that their implementations of networking technologies will not create terrible security debacles waiting to happen; Web developers need to think like a security professional, with all the practical paranoia that entails, so that they will realize the ways publicly accessible Web applications and services can be abused and twisted to nefarious ends, and plan accordingly.

在一定程度上,程序员需要学会像安全专家那样思考,从而影响他们所开发的的软件结构,将倾向于更大的安全;网络管理员和建筑师需要学习这种技能,以确保其实施的网络技术将不会产生定时的可怕安全事故。网页开发者需要像安全专家那样思考,利用所有必需的实际揣测,从而察觉到可公开访问的Web应用程序和服务可以被滥用和扭曲到相应的违法目的、计划的途径。

Programmers need to learn to think like security professionals, to some extent, so that their influence on the architecture of the software they develop will tend toward greater security; network administrators and architects need to learn such skills to ensure that their implementations of networking technologies will not create terrible security debacles waiting to happen; Web developers need to think like a security professional, with all the practical paranoia that entails, so that they will realize the ways publicly accessible Web applications and services can be abused and twisted to nefarious ends, and plan accordingly.

在一定程度上,程序员需要学会像安全专家那样思考,从而影响他们所开发的的软件结构,将倾向于更大的安全;网络管理员和构建师需要学习这种技能,以确保其实施的网络技术将不会产生定时的可怕安全事故。网页开发者需要像安全专家那样思考,利用所有必需的实际揣测,从而察觉到可公开访问的Web应用程序和服务可以被滥用和扭曲到相应的违法目的、计划的途径。

Specialized introduction: This specialized raise has the electronic technology and the information system elementary knowledge, can be engaged in each kind of electronic installation and the information system research, the design, the manufacture, the application and the development higher project technology talented person Main curriculum: The signal and the system, the digital signal processing, the correspondence principle, the microcomputer principle and the connection technology, the monolithic integrated circuit principle and the application technology, the DSP technology and the application, the EDA technology, the construction of data, embedded Linux using the programming, the feeling measure technical, the electric circuit theory series curriculum, the computer technology series curriculum and so on individual hobby * software and hardware research and development computer correspondence literature ping pong photography The experience and the personal experience * 2006.6.29-7.8 compile the staff management system management system using the C language, its basic service activity includes: The staff information warehousing, the revision, the inquiry, the insertion, deletes the staff information and so on * 2006.7.10-7.20 monolithic integrated circuit curriculum design period completes the stopwatch the design, namely the initialization timer is 99:99, 0 starts using the monolithic integrated circuit timer fixed time, fixed time arrives when 0s to transmit the signal to cause the buzzer bell, and may realize suspends, the continuation and the replacement function * 2007.7.2- 7.8 practises in Luoyang Big dragon Peony Communication facility Limited company, does has liquid crystal display monitor telephone one, simultaneously visited has served under somebody's banner the correspondence company, and studied has simulated the telephone the design electric circuit, had understood its basic principle * 2007.7.4- 7.18 completed the DSP curriculum in the school to design, realizes the FIR numeral filter, namely transmitted 25 from DSPThe height level, after advocates AC01 D/A to transform the simulation square-wave, then passes to again from AC01 carries on A/D to transform, produces the data signal, after the DSP numeral filter, finally produces the sine wave * 2008.8.1-8.15 to practise in the Zhejiang Jiang hua abundant power tool limited company, studies the computer software and hardware maintenance.

专业介绍:本专业培养具备电子技术和信息系统的基础知识,能从事各类电子设备和信息系统的研究、设计、制造、应用和开发的高等工程技术人才主要课程:信号与系统、数字信号处理、通信原理、微机原理与接口技术、单片机原理与应用技术、DSP技术及应用、EDA技术、数据结构、嵌入式Linux应用编程、感测技术、电路理论系列课程、计算机技术系列课程等个人爱好*软硬件研发计算机通信文学乒乓球摄影实践经验及个人经历* 2006.6.29-7.8 利用C语言编写员工管理系统,其基本业务活动包括:员工信息入库,修改、查询、插入、删除员工信息等* 2006.7.10-7.20 单片机课程设计期间完成秒表的设计,即初始化定时器为99:99,利用单片机定时器0开始定时,定时到0s时发送信号使蜂鸣器响铃,并可实现暂停、继续和复位功能* 2007.7.2- 7.8 在洛阳巨龙牡丹通信设备有限公司实习,做有液晶显示屏电话机一部,同时参观了旗下通信公司,并学习了模拟电话的设计电路,懂得了其基本原理* 2007.7.4- 7.18 在校完成DSP课程设计,实现FIR数字滤波,即从DSP发送25个高低电平,经主AC01 D/A 转换成模拟方波,然后再传给从AC01进行A/D转换,生成数据信号,经DSP数字滤波,最后生成正弦波* 2008.8.1-8.15 在浙江华丰电动工具有限公司实习,学习电脑软硬件维护。

"Sakhalin II is an environmental time bomb," said Ilyse Hogue, director the Global Finance Campaign at Rainforest action Network.

库页岛二期工程是一个定时的环境炸弹,热带雨林行动网络的Llyse Hogue说,库页岛是一个典型的从珍贵的海洋生态系统中掠取资源的案例。

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As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸,那乌黑、忧郁的眼睛,她便会相信,他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失

But because of its youthful corporate culture—most people are hustled out of the door in their mid-40s—it had no one to send.

但是因为该公司年轻的企业文化——大多数员工在40来岁的时候都被请出公司——一时间没有好的人选。