难以控制

The PID parameter fuzzy self-adjusting controller is designed with the help of MATLAB and used in simulation and practice.

双旋翼多输入多输出系统TRMS由于非线性和强耦合，难以建立数学模型和控制，故提出PID参数模糊自整定的控制方法。

The efficiency is poor and the precision is unassured in traditional jacked-pipe construction surveying. Control system in jacked-pipe construction surveying with total station is introduced, which adopts single-station and simultaneously center-line-taking and elevation control. In the process, the instrument is connected with portable computer providing corresponding software. The locus of spots is shown in time, the center line direction of pipe and the deviation of elevation is directly obtained at the same time.

传统的顶管施工测量，效率低而昆精度又难以保证，本文介绍的全站仪顶管施工测量控制系统，采用一站式实时中线和高程控制，仪器与便携式电脑连接配以相应软件，不仅即时显示测点的轨迹，同时可直接得到管中线方向及高程的偏差。

For thermodynamic and kinetic reasons, a relatively large number of materials can not be directively synthesized by self-propagating high-temperature synthesistechnology. In addition, SHS process is generally difficult to effectively control. These limitations retard the further development of SHS technology. In this project, the imposition of an external electric field is utilized to activate self-sustaining reactions and to simultaneously control SHS process.

为了扩大自蔓延高温合成技术的合成材料范围，并实现对SHS过程的有效控制，本项目分别以反应热小和反应速率低的反应体系为对象，利用外加电场诱发了体系的自蔓延燃烧，合成了在普通SHS工艺下难以合成的材料；同时，将外加电场作为SHS技术中一个重要的工艺参数，同步实现了对SHS过程的柔性控制。

Constitution or criminal law can get effect instantly on controlling death penalty.However,the substantive control ways have some insuppressible localization.

尽管通过宪法或者刑法可以对死刑控制起到立竿见影的效果，但是，通过实体控制死刑，存在难以克服的局限性。

In present practical industry process, most are nonlinear, multivariant and strong coupling plants, which math model often is difficult to get, so the utilization of the traditional decoupling control methods in its control is limited.

现代工业的生产过程大都是具有非线性、多变量强耦合的复杂工业过程，其数学模型往往难以建立，因此限制了传统解耦控制方法在其控制中的应用。

Moreover , tight monetary policies are ineffective because the money supply by People's Bank of China is at least partially passive when Dollar gluts .

运用从紧货币政策强行控制通货膨胀是难以达到理想效果的，因为引发通货膨胀的很大一部分原因在于美元的泛滥，控制增发货币的闸口并不完全在中国人民银行掌握之中。

Sex selection by manipulating the conditions of sperm-oocytes fertilization would be one of the most practicable and widely used methods.

控制受精环境即可控制性别，这种方法不需昂贵的仪器设备或者药品，易实践，可普遍应用，其经济效益和社会效益难以估量。

ABSTRACT Motived by the status of theoretical studies and the requirements of engineering applications in the fuzzy control system, the characters of fuzzy logic systems are analyzed, the mathematic model of a class of fuzzy logic system is built, especially the ways how to use the model to identify the nonlinear dynamic system and design the adaptive control system are researched deeply in this paper.

本论文根据模糊控制理论研究的发展现状、存在的主要问题以及工程实际应用的基本要求，分析了模糊逻辑系统的特性，建立起一类模糊逻辑系统的数学模型，并对其用于非线性动态系统辨识与自适应控制系统设计方法等方面进行了深入的研究，为解决某些传统方法难以解决的工程实际问题提供了新的思路。

It's difficult to obtain optimal control by the conventional control methods for cement raw material mill's complicated working situations.

针对水泥厂生料磨机的复杂运行工况，常规控制方法难以取得良好的控制效果。

How to exactly measure the coal mass of pulverizer in fossil power plant is one of primary causes that the efficiency of milling control is low and the automation is difficult to running. Aiming at the limitation of evidential theory, As the neural network has self-organize, self-learn, collateral distributing manage, strong fault tolerant and robustness, we combined the evidential theory and the neural network and put forward a two-step fusion method.

火电厂中钢球磨煤机筒内存煤量的测量问题一直是制粉控制效率低和自动控制难以投入运行的主要原因之一，针对D-S 证据理论存在的不足，而利用神经网络具有的自组织、自学习、并行分布处理、高度容错性和鲁棒性的特点，本文提出了一种将证据理论与神经网络相结合的数据融合方法，并将其用于解决球磨机存煤量的测量问题。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。