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In order to eliminate the influence caused by the nonminimum phase characteristic of a common Boost DC／DC converter, Viswanathan K has proposed a novel tristate Boost DC／DC converter. For enhancing performance, the statespace averaging model of this converter was first presented in this paper. Due to the nonlinear nature in this model, an inputoutput feedback linearization technique was adopted, and a complete controllable linear system was obtained. Then a statefeedback control strategy was designed based on this linear system. Simulation results show that the proposed control strategy can assure constant output voltage in a wide range, so as to realize the stability of the system during large fluctuation of power supply and load disturbance. Good dynamic performance can also be achieved.

针对 Viswanathan K为消除普通BOOST DC／DC变换器的非最小相位特性而提出的三态Boost DC／DC变换器，为进一步提高这种电路拓扑的性能，在建立了变换器状态空间平均模型的基础上，针对其多变量、非线性特点，采用输入输出线性化将其转化为一个完全可控的线性系统，在此基础上应用现有成熟的线性控制策略进行了控制系统的设计，并且采用MATLAB进行仿真验证，结果表明：这种非线性控制策略可以确保输出电压在大范围内恒定可调，且即使存在大范围扰动(输入电压和负载变化均较大)的情况下，系统也可以确保稳定性和良好的动态性能。

to reduce the impact of carrier frequency offset in ofdm system,this thesis designs a new carrier frequency offset estimation scheme for ofdm system.the carrier frequency offset estimation includes acquisition and tracking.we adopt variable step size adaptive algorithm.the acquisition range of the proposed algorithm is as large as one half of the overall signal bandwidth.through this method we can not only avoid the feedback by using forward error correction,but also reduce the times of complex multiplication in order to reduce the power consumption of the system.this algorithm not only has low complexity and fast convergence nut also can improve the demodulation performance of ofdm system.computer simulation illustrates the superior performance of the proposed algorithm with regard to estimation accuracy in both awgn channel and multi—path channel.

摘 要：为了减小正交频分复用系统受频率偏差的影响，在ofdm系统中设计了一种新的载波频偏估计算法。频偏估计包括跟踪和捕获两个阶段，文中采用变步长自适应算法来进行跟踪，这个跟踪算法的捕捉范围是整个信号带宽的一半。通过此方法，不但可以利用前向纠错的方式来避免反馈，而且可以缩减复数乘法的次数以降低计算复杂度和系统功耗。该方法运算复杂度低，并具有较好的收敛性，能改善odfm的解调性能。从计算机的仿真效果可以看出无论是在awgn信道上还是在多径信道上都表现出了卓越的性能。

A new scheme to compute the state feedback matrix is developed in this paper.

本文提出了计算状态反馈矩阵的新方法。

The theory of "harmonious forest farm" reckons that:①State-owned forest farm is an exoteric complex-system, which is the coupling of forest ecosystem, forestry economic system, and social system in forest farm;②Harmonious forest farm is the farm constructed under the background of socialist market economy and building a moderately prosperous society;③The features of "harmonious forest farm" are the development of production, the prosperity of life and good ecological environment;This farm is a modern state-owned forest farm, the symbols of which are the high value of itself, the good benefits of wokers and the abundance of forest resources;④The key of it is the harmony of farm and society, farm and environment as well as farmitself——that is to say,"harmonious forest farm" should aim to meet the needs of the country and thesociety; forest management should put maintaining and enhancing biodiversity, forest ecosystem health and integrity to the center; inside the forest farm, there should form the mechanism of balancing interests and learning mechanism for sharing at the core of the executive feedback mechanism of forest management, advancing the workers to form a comradely mutual aid relationship.

其要点是：①国有林场是开放的复杂系统，它由森林生态系统、林业经济系统、林场社会系统耦合而成；②和谐林场是在社会主义市场经济和全面建设小康社会背景下建设的林场；③和谐林场是以生产发展、生活富裕、生态良好为特征，以国有林场价值高、林场职工福利好、森林资源丰富为标志的现代国有林场；④和谐林场的关键是要求林场与社会、林场与环境以及林场自身达到和谐，即"和谐林场"必须以满足国家与社会的需求为目的，在森林资源经营上，始终以维持与提高生物多样性、森林生态系统的健康与完整为中心，在林场内部形成以森林经营方案执行反馈机制为核心的利益均衡机制和学习共享机制，促进林场干部职工形成同志式互助关系。

Happiness is like concentric circles, to give you a starting point, so that feedback is the hope and enthusiasm of many.

幸福就像同心圆，给你一个起点，让回馈它无数的希望与热情。

While navigating concertedly,the communication of the relative location in between the robots and the feedback of the robot enviroment-sensing data and so on both rely on the wireless communication system.

多机器人系统在协调运动时，机器人之间相对位置的通信、机器人环境感知信息的反馈等都依赖于无线数据传输系统。

In DMMCS, there is an alternative distribution of inertial instability column and inertial stability column, at the west and south, there lie negative CVV columns, while negative CVV column is beneficial to deep moist convection.(4) The strong slantwise convection induced by inertial instability, baroclinic instability and conditional symmetry instability will enhance the upper level southerly component. Because of the appearance of the compensated downdraft at the low level of the south side of DMMCS, the low level southerly is intensified, the enhancement of upper- and low-level cores are in favor of the development of DMMCS. And that will do favor for the reinforcement and maintenance of inertial instability, baroclinic instability and conditional symmetry instability, it is a positive feedback process.

深湿对流系统中高层西侧为负MPV2 柱，东侧为正MPV2 柱；(3)深湿对流系统中惯性不稳定柱与惯性稳定柱相间分布，西侧为负CVV 柱，东侧为正CVV 柱，负CVV 柱对深湿对流起激发作用；（4）惯性不稳定、湿倾斜不稳定和条件不稳定产生强的倾斜式对流，而强的倾斜式上升运动加强了深对流系统北侧高层的南风分量，因深对流系统南侧低层出现补偿性下沉气流，因而低层南风加强，高低空急流中心的加强会进一步加强对流的发展，使得惯性不稳定、湿倾斜不稳定和条件不稳定增强和维持，这是一个正反馈过程。

The mechanism was similar to the equivalent barotropic warm core structure. The Conditional Instability of the Second Kind was the primary mechanism of development and maintenance for MCSs in case 2005. As the MCSs intensified and persisted, the latent heating was highly efficient in producing significant enhancement of Mei-Yu front systems. The LLJ intensified by Coriolis acceleration of ageostrophic wind was induced by the effect of latent heat release. The LLJ and the effect of latent heat released reinforce each other in convection system through a positive feedback process.

综合而言，2005年个案中梅雨锋面结构为垂直近乎不倾斜的浅系统，槽线系统不明显，锋面水平温度梯度微弱，低层具有强水平气旋式风切，较似正压系统，个案中MCS发展及维持机制，主要是透过CISK 过程来维持；其过程是由於低层锋面带上之辐合激发对流发展，对流潜热释放造成局部气压梯度增强，因而增强地转风；而潜热释放亦有利低层辐合之增强，产生非地转风，再透过科氏加速增强西南风，使LLJ增强，形成一正向的回馈作用。

Make sure people are honest with you by requesting feedback anonymously and confidentially

你要确保周围的人会对你在悄悄，不记名地做反馈的时候会直言不讳

Feedback takes the form of a congratulatory graphic and sound.

反馈采取的形式祝贺图形和声音。

You can do some assertiveness training.

你可以进行一些自信训练。

We were well on the path to making a rear-wheel-drive global platform," says Mays."

我们正致力于建立一个后轮驱动的平台，"Mays这样说道。"