多变量的

A new efficient method of numerical iteration solution to the boundary value problem was put forward.

结合航天飞机和飞马火箭的制导律，进行了制导技术的开发，提出了一种新的基于该控制律的火箭真空段运动的多变量边值问题的有效数值迭代解法。

In order to eliminate the influence caused by the nonminimum phase characteristic of a common Boost DC／DC converter, Viswanathan K has proposed a novel tristate Boost DC／DC converter. For enhancing performance, the statespace averaging model of this converter was first presented in this paper. Due to the nonlinear nature in this model, an inputoutput feedback linearization technique was adopted, and a complete controllable linear system was obtained. Then a statefeedback control strategy was designed based on this linear system. Simulation results show that the proposed control strategy can assure constant output voltage in a wide range, so as to realize the stability of the system during large fluctuation of power supply and load disturbance. Good dynamic performance can also be achieved.

针对 Viswanathan K为消除普通BOOST DC／DC变换器的非最小相位特性而提出的三态Boost DC／DC变换器，为进一步提高这种电路拓扑的性能，在建立了变换器状态空间平均模型的基础上，针对其多变量、非线性特点，采用输入输出线性化将其转化为一个完全可控的线性系统，在此基础上应用现有成熟的线性控制策略进行了控制系统的设计，并且采用MATLAB进行仿真验证，结果表明：这种非线性控制策略可以确保输出电压在大范围内恒定可调，且即使存在大范围扰动(输入电压和负载变化均较大)的情况下，系统也可以确保稳定性和良好的动态性能。

The research employs three variable VAR systems and the result shows that in different regions the causality of scale and efficiency index between financial intermediation and economic growth is different because of the differentials of regional economic development. Finally, the authors suggest that the financial intermedia...

通过运用多变量VAR系统的研究表明：金融中介的规模指标和效率指标与经济增长在各地区间的因果关系不一致，这与地区间经济发展水平的差异有直接关系，中西部地区的金融中介机构为更好地促进本地区经济增长应该扩大对非国有企业的贷款。

Subsequently, for guaranteeing the independence of analyzed factors, the principal components analysis method was conducted to avoid the collinearity problem in the assessment of landslide susceptibility. The new scenario was carried out in the logisticl regression analysis method and produced a new landside susceptibiltiy map.

地质科学家的判别经验分析确定的评价要素存在相互重叠的共线性问题是不可避免的，为了保证评价要素的独立性，判别式的主成分多变量分析法被执行确定了新的评价要素；随后LR模型被再次执行绘制了新的滑坡危险等级地图。

Because of the nonuniqueness in the positional solution, it's not easy to test the performance of the coordinated control system. So the model of NN was built to convert the vector of the length of 6 jars into the vector of the position of the motion deck. It's fast and accurate for the lengthwise direction. The state space system model of the six degree freedom motion simulator was built by the equations of electrodraulic servo mechanism and the multi-body dynamics equation of the six degree freedom motion simulator,the vector of the length of 6 jars was the control variable.

本文结合六自由度运动模拟器的多体动力学方程和电液伺服驱动机构的特性，经简化得出了具有实际意义的六自由度运动模拟器整体系统的状态空间方程式，通过分析该系统的稳定条件和能控性，采用状态反馈对系统的状态方程式进行合理配置，从而建立了以运动模拟器杆长向量为控制变量的运动模拟器整体控制系统，并将该控制系统输出的杆长向量转换为位置向量。

This paper described a experiment study of remote sensing systematic analysis on natural resource and environment Change monitoring. Main methods concern changed factor extraction through the brightness statistics, ratio and texture analysis; matching multi-temporal remote sensing data, normalized difference comparison,"brightness" and "greenness" difference analysis of principal components method by using image processing system; updating renewable natural resources changed map through overlaying or partly revising multi-temporal maps by using geographical information system; establishing mathematic model, such as: variable correlation regional regression and tendency surface analysis etc., for researching renewable natural resource change law.

本文叙述了有关资源环境动态遥感监测研究方面的初步探索性工作，主要包括利用图像处理系统，根据专题变化因素的光谱亮度统计进行密度、比值和纹理处理、不同时期遥感信息的复合处理和规一化差值及主成分分析法的"亮度"、"绿度"差值分析；利用地理信息系统，采用覆盖分析和局部更新法进行再生资源变化图件的快速更新，以及为研究再生资源动态变化规律，而进行的多变量相关、区域回归分析方法。

To the schoduling problems arised in FMS, we develop an extended approximate Brownian network model for the multistation inulticlass queueing with general service time distribution, unreliable stations and finite buffers under balanced heavy loading conditions.

本文针对FMS的调度问题，考虑到多台机器、机器不可靠及缓冲库容量有限等特点，在满负载平衡的条件下，建立了一种近似的布朗网络模型，然后基于求解这个模型的最优控制问题而得到的最优队长和最优空闲时间，提出了一种最优控制策略，包括排序策略和输入控制策略，因为不涉及随机变量的分布类型，所以本文的方法适用于一般的FMS。

The coring was successfully operated on the winter ice-cover of the lake in 2000 and the pioneer practice of the ""off-the-ice"" coring proves to be very useful and economic for taking quality cores from lakes in northern China.A multidisciplinary investigation has been carried out on core HQH4, one of the three 11-m-long cores. Results from previous investigation include lithostratigraphy, radiocarbon dating, paleoecology of Ostracoda, stable isotopic record of ostracod shells, total nitrogen and organic carbon, C/N ratio, 81 C of organic matter etc.

在对深度为11米的HQH4岩芯开展了~(14)C年代学、岩性地层学、介形类古生态及介壳稳定同位素、有机碳和总氮及C/N比值、有机碳同位素等多学科综合分析测试和研究工作的基础上，本硕士学位论文研究侧重开展了：1HQH4岩芯烧失量(Loss-on-ignition)的系统分析测定及该地层学变量的古湖泊和环境变化意义的研究；2沉水植物川蔓藻化石种子生态学特征及其在黄旗海湖泊水位重建和气候变化研究方面的重要意义的研究。

The application of multi-factor non-financial indexes is helpful for us to detect potential risk sources and find out the key discriminators for corporate business distress, as a result, improving the effect of evaluation model.

在评价中使用多因素的非财务指标可从不同侧面探测经营困境潜在的险源，搜寻对经营困境具有较强辨识力的变量，从而提升模型的评价效果。

In order to keep the D-stability of multivariable system with respect to parameter uncertainty, the largest region in which the parameters of the system are allowed to perturb is constrained by the region D in complex plane and its nominal system.

摘要为了保证具有参数不确定性的多变量系统的D-稳定性，它们的参数最大允许摄动范围将受到复平面中区域D以及标称系统的限制。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。