查询词典 variable-density system

The database administrator can adjust variable parameters to improve the performance of a database system.

DBA 可以通过调整变量参数的值来提高数据库系统的性能。

This paper discusses an intelligent spatial decision support system for variable rate fertilizing of precision agriculture, VRF-ISDSS.

介绍一个具有数据库、知识库、方法库与模型库，用于精细农业中变量施肥的决策支持系统VRF -ISDSS。系统包括农业区的基础地理信息、作物生产知识、作物生长养分需求的数学模型和分析方法。

The results show that: the general variable trend of its spatial structure is of deconcentration,and the factors,including economic development,the change of industrial layout,the transformation of management policies of the port system,the dema...

鉴于此，运用模糊聚类、货种区位商等分析技术，对其体系内的港口等级层次、职能结构的基本特征进行探讨，并在此基础上提出了各港口职能分工的发展方向。

The audible effects are variable and also dependent of the quality of the stereo system in general.

通常，听得见的效应由于这个立体系统的质量而易变以及依靠。

The main research contents and results are given as follows:(1) Principles and characteristics of different types of polarization controllers are analyzed, the compare of the difference of these polarization controllers are discussed based on them, drawn a conclusion that the polarization controller which based on squeezing fiber and has variable delay quantity are suitable for high speed optical communication system.(2) The reset principle of the typical four channel polarization controller which is based on squeezing fiber is analyzed, and the design of its concrete reset scheme is given based on them. The reset process and the corresponding operation list are given in detail.(3) The systematical experiment is made when the typical four channel polarization controller is put into the PMD compensator. The experiment result showed that the channel which needs reset can efficiently return to the mean place, and the effect of reset was good, it didn't cause any badness infection on PMD compensation.(4) A new type optical signal time-domain depolarizer is given, and a new PMD compensate method is given based on it.

由此得出延迟量可变型光纤挤压型偏振控制器适用于高速光通信系统的结论；(2)具体分析了典型的四通道光纤挤压型偏振控制器的复位原理，并在此基础上对其进行了具体复位方案的设计，给出了各种情况下的详细复位流程和相应的复位操作列表；(3)将四通道光纤挤压型偏振控制器应用于偏振模色散补偿器中进行系统实验，实验结果表明，需要复位的通道能有效地回到中间值，复位效果良好，且复位未对PMD补偿产生不良影响；(4)设计了一种新型的光信号时域退偏器，并基于该退偏器提出了一种新型的偏振模色散补偿方法。

In this paper,variable structure control of MIMO 2D discrete system is studied.

研究多输入-多输出2D离散系统的变结构控制。

This design of variable structure sliding mode control for discrete time system using method of approach law is studied.

研究了线性定常离散系统、离散不确定系统、滞后离散确定系统变结构控制策略。

Base on the lumped parameter model of the torsional vibration system of crankshafts with variable inertia and considering the nonlinear elasticity force and nonlinear dissipative force, a six-degree-of-freedom nonlinear dynamical equations with parametric excitation and compulsive force are deduced.

从旋转惯量变化的曲轴扭振系统的集总参数模型出发，同时考虑了系统的非线性弹性力和非线性耗散力，导出了参强联合作用下的六自由度非线性扭转振动微分方程。

Based on the study of the patent, a new variable displacement of double-action vane pump was discussed, which consists of floating blocks. The pump belongs to an automotive hydraulic power steering system, and prosperous utilization is expected.

平衡式变量叶片泵是一种基于专利技术的含有浮动块的断型容积式叶片泵，该泵应用在汽车转向助力泵等工况，是一种较有应用前景的新型叶片泵。

Utilizing plane sectorial domain Hamilton system function via variable substitutes and eigenfunction expansion method, an analytical element is proposed in this paper for the crack analysis of reinforced concrete structures combining the bridging model and Dugdale model. Combined with finite element, nolinear crack problems of reinforced concrete structure can be analyzed.

利用平面扇形域哈密顿体系方程，通过分离变量法及共轭辛本征函数向量展开法，结合Dugdale模型和桥联力模型，推导了钢筋混凝土结构裂纹尖端的解析元列式，将此解析元与普通有限元结合，可用于分析钢筋混凝土的非线性断裂问题。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。