不稳的

The last three joints of PБ-211 robot are controlled by symmetric valve controlling asymmetric cylinder system.

由于对称阀控制非对称缸两个运动方向上系统的开环增益及某些参数的不同，使得两个方向上的动态特性不对称，主要表现在超调量、调节时间、振荡次数和稳态误差等几个方面，这种本质上的非线性和非对称性给系统控制带来困难。

Three classes of equivalent system methods which are used in finding high order flight control systems low order equivalent are studied. The first class methods are the classical frequency domain-based equivalent system methods which recommended by MIL-F-8785C and MIL-STD-1797A. Five longitudinal low order equivalent systems and fourteen lateral ones are discussed in detail and some pieces of advice are given. Also conduct an investigation in the time domain-based equivalent system methods .

研究了求取高增稳飞机的低阶等效系统的几种方法：研究了经典的频域等效系统方法，针对纵向5种、横向14种构型的低阶等效系统进行了拟配实践，并提出一些有益的看法；以频域等效系统方法为基础，提出了时域等效系统新方法；以最小二乘辨识为基础，提出了两种纵向短周期低阶等效系统时域辨识方法(等效延迟时间τ_q参与或不参与)。

The positions at cavity mirror of ray which propagates back and forth in the CCP laser resonator are analyzed, it shows that the CCP resonator with three equal dihedral angle errors (three dihedral angle errors are not 0) is an unstable resonator.

对在腔内往返传输的光线在镜面上的位置进行了分析，结果表明：3个二面角误差相同且不为零的角锥棱镜构成的谐振腔为约束非稳腔。

A new discrete reaching law is presented to improve the reaching process of discrete exponential reaching law.The discrete-time variable structure control system designed by this reaching law can not only weaken the chattering and control the system state approach to zero diminishingly,but also keep the basic property of quasi-sliding mode which can cross the switching surface step by step.This method improves the reaching process and enhances the control quality of the control system.

为了改善离散指数趋近律的趋近过程，提出了一种新的趋近律，利用该趋近律设计的变结构控制器，不仅能够大幅度削弱抖振，使系统运动最终趋于原点不存在稳态振荡，而且能使系统的准滑动模态保持步步穿越切换面的基本属性，有效地改善了趋近过程，提高了控制品质。

In fact, the flow in stirred tank is unstable, and the fluxion changed from time to time, as well as space. Macro-instabilities are the most apparent.

事实上，搅拌槽内流体流动是非稳态的，槽内流体在相当大的时间和空间尺度上存在着流动的明显变化，宏观不稳定现象是其中明显变化的一种情况。

The first part of the whole, including: the main-scale displacement and the identification, map type, weight and general layout of calculating the focus of the plan is formally established; into the second performance, including: self-transformation and-line mapping, static water Calculation and static hydraulic curve, the stability of floating state calculation; third dip into the calculation; summed up into the fourth part, based on an evaluation of the design, lessons learned, the comprehensive knowledge.

第一部分为总体部分，包括：排水量及主尺度的确定、型线图、重量重心计算和总布置正式图的确定；第二部分为性能部分，包括：仿式变换与型线图绘制、静水力计算及静水力曲线图、稳性浮态计算；第三部分为大倾角计算；第四部分为总结部分，为本次设计作出评价，总结经验教训，综合所学知识。什么专业的？搞这么复杂的东西。报酬就免了，给了我也拿不到。

Cervical spondylosis is due to cervical back muscle strain as well as the unbalanced paravertebral muscle strength caused by long-term working with head drop, which thereby leads to a set of syndrome: cervical intervertebral disc degeneration, narrow intervertebral space, unstable vertebrae unit, protruded or extruded nucleus pulpous; hyperosteogeny, ligament pachynsis, narrow neural canal or nerve root canal; oppressed nerve root and spinal cord, stimulated vertebral artery and sympathetic nerve; aching and discomfort cervix; numbness and disability of the body; functional disorder in relieving the bowels; dizziness and nausea, etc.

颈椎病的原理及颈椎功能锻炼的原理 Theory of Cervical Spondylosis and Cervical Vertebrae Dirigation 颈椎病是由于长期低头工作等原因所导致的项背肌劳损、颈椎周围肌群肌力不平衡，从而使颈椎间盘退变、椎间隙狭窄、椎节失稳、髓核脱出或突出、骨质增生、韧带肥厚，使椎管或神经根管狭窄，压迫脊髓、神经根、刺激椎动脉及交感神经，出现颈部酸痛不适、躯体麻木无力、大小便功能障碍、头晕恶心等症状的一组综合症。

It is impossible for China to develop its economy out of the context of the broad world economy.

中国的经济离不开世界，我们虽然出现了经济的企稳回升，但是我们许多企业的经营状况还没有根本好转，它们主要靠政策的支撑。

In the present paper, two new hypotheses are proposed that the outward normal of the dendrite surface is parallel to the gradient of the actual supercooling, and that the dendrite growth is capable to minimize the solute transfer .

但是，以往的研究中，枝晶组织和枝晶生长这两个密切相关的问题一直被分隔开来进行研究；在稳态枝晶生长理论研究中，由于枝晶界面真实形状问题没能解决，迄今为止，比较有希望的理论模型都是建立在"枝晶界面的旋转抛物面假设"这样一个早已被认定不是枝晶界面真实形状的"基础"上。

First, the criteria of iterative calculation are founded on the basis of the conservation relationships of system charge and refrigerant mass flow rates.

针对目前制冷系统稳态仿真算法设计不规范造成的概念和逻辑上的混淆，提出一种通用的算法设计方法。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。