难控制的

The requirement of control system specification constantly and diversely changes which results in the problem that the control software is hard to program and test. In order to deal with the problem, the theory of control system design based a high level extended Petri net is discussed in this paper.

为了解决现代控制系统的规模越来越大，柔性要求越来越高，所导致的控制软件的编制和调试越来越难的问题，本文主要探讨了基于一种高级扩展Petri网的控制系统设计理论。

As a result, a simple control method can not improve the dynamic performance of speed servo system. Integrated the advantages of self-adaptive control, fuzzy control and PID control, an intelligent dual module NC servo controller, called self-adaptive fuzzy PID controller is designed according to the modular design principle.

在光干涉弹流油膜测量系统中，速度伺服系统的控制参数和结构参数是影响速度伺服系统性能的主要因素，且具有时变性和不确定性，采用单一的控制策略很难达到提高速度伺服系统的动态性能的目的。

In this case, it is necessary to study and explore control measure integrated with intelligent theory based on the characteristic of time-delay system.

然而，时滞系统很难靠单一的控制方法来完善解决，针对时滞系统的特点，研究和探索与智能理论相结合的控制方法就显得十分必要。

The median time to achieve a neutrophile count of 0.5×109/L was 10 days after the last dose of chemotherapy in regimen A,and the time was 16 days in regimen B.The average SLEDAI decreased from 9.2 to 4.4,and the proteinuria decreased from to (0~+) in 3 weeks after the treatment.Two cases with complication of hemolytic anemia and 1 with thrombocytopenia before the treatment recovered to normal or nearly normal hemogram respectively.Among these 5 cases,1 patient had a short time improvement during the therapy,but died 50 days later because of refractory thrombosis of renal vein; 4 other patients achieved complete or partial remission within 5~16 months follow-up.

结果方案1从CTX结束算起，中性粒细胞恢复到0.5×109/L平均需10d，方案2从Ara-C结束起，中性粒细胞恢复到0.5×109/L需16d；治疗3周时 SLEDAI平均从9.2降至4.4，尿蛋白从降至(0~+)，合并有重度难治性贫血或血小板减少者，治疗后血红蛋白或血小板分别恢复正常或接近正常；方案2治疗的1例由于肾血管血栓形成未能控制，病情短暂好转后再度恶化，1个月后死于DIC和肾功能衰竭；另4例随访5~16个月，病情基本控制。

Experimental results verify that the model is more efficient and securer than traditional access control model.

近年来，访问控制模型在企业的管理系统中得到广泛的应用，但是，通常很难正确方便地管理访问控制策略，这主要表现在以下2个方面：(1)随着管理系统中用户数量的增加和程序复

But the added capacitance spur track makes the control of the rectifier much more complex.

但是电容支路的引入，将使传统的控制策略很难达到优良的控制效果。

ABSTRACT: The curriculum"Automatic control principle" is of strong practice, and there exits many difficult problems such as practice,prelect for many years.so its difficult for teachers to impress students lively and profoundly only by lectures and the performance of teaching is not very good.

摘 要：自动控制原理专业是一门实践性很强的学科，历年来存在着讲课难、实践难等老大难问题，课堂上的讲解并不能给学生留下鲜明而深刻的印象，教学效果很不理想，所以必须寻找新的教学途径，提高教学效果。

I. By the recommendation of preferential combos for restaurant, foreigners who feel difficult to choose restaurants under a foreign sky can easily find suitable restaurants and control budgets effectively.

一、 通过对餐饮店特惠套餐的推荐，让在异国他乡选餐厅难、点菜难的外籍人士可以方便挑选到适合的餐饮店，并能有效控制预算。

The research shows that the method excellently resolves the technique problems in model description, reasoning and simulation with the model, and the process of control system analysis and design, which gives the important impetus on intelligent modeling and control theory on uncertain systems characterized by lucking quantitative description tools.

研究结果表明这种方法在模型表示、模型推理与仿真、控制系统分析设计过程均很好地解决了技术难题，对难定量描述的不确定性系统智能建模与控制理论研究具有重要的推动作用。

We think this must surely be a smokescreen for preventing explicit political content, since sexual content is itself a form of control. There is no better way on earth to castrate collectivised protest than to have everyone sitting in their bedroom, atomised and alienated , doing things they want to do in private .

第三个原因是认知差距，这使我们很难只从表面去看绿坝软件：中国人认为他们能够通过控制色情来预防社会动乱，而我们认为这一定是罩在政治控制外面的烟幕，因为性的内容本身就是一种控制方式。

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。