上模

The strategies of high order sliding mode control and sliding mode control with integral action are proposed. Without losing the virtue of robustness and the ability of eliminating disturbance, these strategies can minimize the chattering phenomenon which is quite common in conventional sliding mode control.

在研究中，提出了高阶滑模控制和带积分的滑模控制方法，这两种方法在保证了常规滑模控制的强鲁棒性和抗扰动能力的前提下，可以在很大程度上削弱抖振，对常规的滑模控制有较大的改进。

The title of this article is the estimate of the essential norm of a compositionoperator between Bloch-type spaces in the unit ball of C^n. That is to say, making useof the tool of the essential norm ,we get the upper estimate and the lower estimate ofthe composition operator which we have studied .In addition, we get a sufficient andnecessary condition for the composition operator to be compact.

本文主要讨论了单位球上Bloch型空间之间复合算子的本性模估计，即用本性模这个工具来研究复合算子并给出了我们所研究算子的本性模的上界和下界估计，并由此可以得到相应算子紧的充要条件。

Put die on the die seat, adjust cross- plate and transducer draging plate of up and down, so that the steel needle can be inserted into die hole to adjust the pressure of weight, and then place the abrasive, open power switch of ultrasonic and rotating switch of die seat.

模具放在模座上，调节十字脱板及换能器上下拖板，使钢针插入模孔内，调整砝码压力，然后放上磨料，打开超声波电源开关和模座旋转开关。

According to the demand of high magnetic field power supply, reference is increased with a set ramp rate and stops at a set stable value, so reference system is composed of digital setting and digit to analog converting circuit. But the stability of reference is mostly guaranteed by the performance of D/A circuit, so D/A circuit is particularly studied in reference system. The scheme of D/A circuit, the selection of DAC and its voltage reference, hardware anti-jamming design and PCB design are discussed in detail, and software of remote control and PLC are discussed in brief. Zero-flux DC current transformer well satisfies the demands of the high stability of Load current detection unit, so the principle of zero-flux DC current transformer is analyzed; in the mean time a project which detects the long term stability is designed. During 8 hours, analog signal which is detected with high precision digit multimeter is recorded in computer at 1HZ frequency by GPIB communication. The drift error source and related parameters are explained in the compare-amplify part. Detailed subtraction circuit is designed; also amplifier chip and periphery components are selected and verified according to the theory of error analysis.

根据强磁场电源的需求，参考源应按照软件设定的斜率逐渐上升到设定稳态值，则参考源系统应由数字给定和数模转换电路两大部分组成，而参考源的稳定度主要依靠完成数模转换功能的模拟电路的性能来保证，因此本文对参考源系统的研究以数模转换电路为重点，分别从电路方案的确定、数模转换芯片及其基准电压源的选取和验证、电路板硬件抗干扰和PCB设计几方面进行了论述，然后对数字给定部分的远控组态和PLC程序设计作了简要介绍；采用零磁通原理的直流电流转换器很好地满足了对负载电流检测单元高稳定度的需求，本文详细分析了零磁通检测的原理，并在选定此种类型电流转换器的基础上设计了一套检测长期稳定度的方案，8小时内以1秒为采样周期，通过计算机Labview程序和高精度数字电压表的GPIB通讯，将被高精度数字电压表数字化后的模拟信号采样值连续记录至计算机中；比较放大环节简要阐述了漂移产生的原因和相关参数指标，确定了具体的减法电路形式，并根据误差分析理论对运算放大器和外围元器件进行了选取和验证。

Moreover, we define weak principally quasi-injective modules and study Jacobson radical of endomorphism ring of weak principally quasi-injective modules.

另外我们还在主拟内射R-模的基础上定义了弱主拟内射R-模，利用零化子对弱主拟内射模上自同态环的Jacobson根的性质进行了讨论。

The metal mold design nowadopt a form of one mole but six cayities ,this way can improve theefficiency;the mold's joint face is theball's neutral plane,that makes the mold openedconvenient;In the gating,the runner and the riser is the same ,andthis design adopt scum riser,that make sure a better routing andmake sure the casting's feeding;the mold usegravity to lockwasher itself;the core's materialis quartz sand,and spread high tempearature resistant dope on it;Inthe design, same taper in the guide bush of the core box is neededto make sure open the mold easily;The insert blocks of the core boxare made by numercial control processing,this way reduce the costof production; the scale division positioner make sure the samespecification has better interchangeability,also,as all themachining can be finished on the general machine tool,it make thecost low,so it can be spreaded abundant in the medium and minorenterprise;when workout the mold's processingtechnology,this design adopt the rough's two endplane as benchmark,the ball cavities are machined by scale divisionpositioner;then use Autocad,Pro/e to draw planar and threedimension blueprint,use Pro/e to make three-dimensionalanimation.

本次设计的群铸模具采用一模六腔形式，生产效率高；模具分型面选择磨球的中性面，使得分模方便；浇注系统采用浇冒口一体形式和集渣包设计，保证了良好的加工工艺和补缩；锁模方式为重力锁模；砂芯采用石英砂，并在表层涂以耐高温涂料；芯盒导套选择一定的锥度，使取模容易；芯盒镶块运用数控加工，降低了生产成本；分度胎具保证了同种规格模具具有良好的互换性，而且因为所有加工基本都可以在普通机床上完成，生产成本低，可以为中小型企业普遍采用；在加工工艺编制过程中，采用两端面互为基准，球腔用专业夹具加工；Autocad，Pro/e分别制作了模具的二维和三维立体图，并运用Pro/e制作了三维动画演示。

Place the die on model base, adjust the cross board and dragging board of transducer to make the steer needle insert into the model pole, then put on abrasive, open up the switch of ultrasonic power and model base circumrotation.

模具放在模座上，调节十字脱板及换能器上下拖板，使钢针插入模孔内，然后放上磨料，打开超声波电源开关和模座旋转开关。

Spatial pattern of the sea surface temperature appears a basin mode consistent with the isobaths in SCS, while the wind field exhibits a weak winter or summer monsoonal characteristic. The MOCM in different season may reflect a positive SST-evaporation-wind feedback which may be stronger in winter than in other seasons.

结果发现；第一模态为最显著模态，模态协方差贡献比在四季均超过80%，空间上SST表现为与南海等深线相一致的海盆模态，风场上主要表现为弱的冬季风或弱的夏季风，各个季节的海－气耦合模态都主要反映了SST-蒸发－风反馈这样1种正反馈的海－气相互作用过程，而且冬季风期间这种相互作用要更强烈些。

The first step of this method is to remove the noises of image edge using wavelet modulus maximum's performance in multi-scale and Lipschitz exponent relation,and then adopts dynamic threshold,that is,former scale modulus image's mean modulus is used as next scale's modulus image threshold.Finally,this arithmetic is tested in image databases of cars.

一种改进的小波模极大值不变矩算法，首先利用小波模极大值在多尺度上的表现与Lipschitz指数的关系去除图像边缘的噪声点，然后采用动态确定阈值的方法，利用前一个尺度下模图像的平均模值作为后一个尺度下模图像的阈值，最后将此算法应用于汽车图像库。

Considering the design parameters of the BEPCⅡ, in the case of one cavity type being adopted, the thesis analyzes the RF performance of accelerating mode, the suppression of higher order modes , and the restriction caused by HOMs against beam current threshold.

结合BEPCⅡ的设计参数，论文对其中一种腔型在BEPCⅡ上使用时加速模式的微波性能、高次模的抑制效果以及高次模对储存流强阈值的限制等方面进行了分析，并在铝模型腔上测量了加铁氧体高次模抑制器前后，超导腔中各种谐振模式的有载品质因子及其频率的分布。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。