系数问题

Secondly, a conjecture about the stability for these systems is proposed based on the sufficient and necessary condition of the isolated transfer function being positive real. When the zeros and poles of the transfer functions lie in the imaginary axis, a known conclusion is derived from the conjecture; while the zeros and poles are on the real axis, a new result is obtained and is proved in this note. Finally, according to the conjecture, an example with poles existing on the complex plane is presented, which is not only interesting but also challenging.

然后， 基于所有孤立部分传递函数都正实的充分必要条件给出了上述系统为稳定的一个猜想，当传递函数的零极点都位于虚轴上时，由这一猜想得到了一个已知的结论；当传递函数的零极点都位于实轴上时，由这一猜想得到了一个新的结论，本文证明该结论是正确的；最后，根据这一猜想，给出了传递函数极点位于复平面的一个例子，它涉及到一类系数矩阵为时变正定矩阵的振动方程的稳定性问题，值得去深入研究。

The invention is capable of increasing the air pressure in the air inlet manifold and improving the aeration coefficient in the cylinder while in instantaneous acceleration, thereby changing the combustion conditions of the internal combustion engine at a medium and low speed, resolving the problem of the poor accelerating performance of the turbocharger at the medium and low speed, improving the output torque at the medium and low speed, optimizing the accelerating performance and greatly shortening the acceleration response time of the automobile; moreover, because the fuel is fully burned, the utilization factor of the fuel is also improved and the discharge capacity of the internal combustion engine is reduced.

本发明能够增加进气歧管内的空气压力，提高加速瞬时缸内的充气系数，从而改变内燃机中低速的燃烧状况，并改变涡轮增压机中低速加速性能差的问题，提高中低速的输出扭矩，优化加速性能，使车辆的加速响应时间大大减短；同时，由于燃料获得了充分燃烧，也提高了燃料的利用率，降低了内燃机的排放量。

The transient free-surface Green function was used to formulate the integral equation on the body surface.

采用时域自由面 Green 函数将定解问题转化为物面上的积分方程，进而求解水动力系数和船舶运动方程。

Numerical simulation of temperature field of soil around the horizontal ground pipe;2. The paper presents a new technique of producing methane with solar heating in cold area,develops the experiment system for producing methane with solar heating,studies the heat-transfer content、temperature difference of heat interchanger and temperature field of soil around the digester fermenting,gives the value of heat .

为解决北方地区由于冬季气温、地温低，沼气生产存在产气率低、使用率低、原料分解率低、沼气使用综合效益差等问题，文章介绍了一种利用太阳能加热制取沼气的方法，建立了太阳能加热制取沼气的试验系统，研究了换热器的加热量、进出口温差以及沼气池周围土壤温度场的变化情况，并给出了换热器的传热系数。

The paper presents a new technique of producing methane with solar heating in cold area,develops the experiment system for producing methane with solar heating,studies the heat-transfer content、temperature difference of heat interchanger and temperature field of soil around the digester fermenting,gives the value of heat .

为解决北方地区由于冬季气温、地温低，沼气生产存在产气率低、使用率低、原料分解率低、沼气使用综合效益差等问题，文章介绍了一种利用太阳能加热制取沼气的方法，建立了太阳能加热制取沼气的试验系统，研究了换热器的加热量、进出口温差以及沼气池周围土壤温度场的变化情况，并给出了换热器的传热系数。

This article analysis the effects of canopy structure: cultivated density and canopy thickness, canopy azimuth angle and gradient, canopy height and interline distance, canopy stretch degree, leaf area coefficient, leaf area density; fruit photosynthesis characteristics: leaf optical characteristics required, changes in law of fruit Pn's season and day; the internal and external effects of photosynthesis; light interception and distribution, the paper puts forward some exiting problems and provides direction for future research.

本文通过对影响叶幕结构的因素：栽植密度与叶幕厚度、叶幕方位角和倾斜度、叶幕高度与行间距离、叶幕开张度、叶面积系数、叶面积密度；果树的光合特性：叶片的需光特性、果树净光合速率的季节和日变化规律；影响光合作用的内、外界因子；光能的截留和分配的分析，提出研究中存在的问题，为以后的研究提供方向。

The main contributions of this dissertation can be summarized as follows:First of all, in the dissertation the linear programming problem whose objective function has interval coefficients is investigated.

全文主要内容如下：首先，对目标函数中具有区间系数的线性规划问题进行了讨论。

Aiming at speed of the program and capacity of hidden information in traditional algorithms as equation reordering, this paper proposed a new algorithm based on inverse number of equation's operand coefficient.

针对方程式重排序等算法存在的程序运行速度、信息隐藏量等问题，提出基于方程式操作数系数排列逆序数的软件水印算法。

Firstly, the strict-feedback nonlinear systems with unknown virtual control coefficients bi have been studied and the problem of its inverse optimality has been solved, that isThe new solvable theorem of inverse optimal gain assignment problem has been proposed through the method of modular design for the original system.

本论文的内容安排如下：第一部分把上述严格反馈系统进一步推广为具有未知虚拟控制系数bi的严格反馈系非线性统并研究其逆最优问题，即第二部分对于推广之前的系统利用模块设计方法提出新的逆最优增益配置定理。

Using the Mindlin theory, the four-node finite element shell modal of healthy and damaged structure is formed; Using Green Function theory, the fluid around the structure is considered to be inviscid, irrotational and incompressible, and then the effect of fluid to structure is translated to the added mass matrix compared with global mass matrix using BEM.

基于Mindlin理论，本文建立了描述健康和损伤的四结点有限元板壳单元模型；基于Green函数理论，将结构所处的流体环境考虑为无粘、无旋、不可压缩的理想流体，推导了三维问题拉普拉斯方程的基本解，并利用边界元方法将流体对结构的影响归结为对结构整体质量矩阵的影响；针对各向同性损伤单元，采取刚度各向整体弱化的方法分析；对于各向异性损伤单元，采用Kachanov理论，引入了x和y两个方向的弹性损伤折减系数。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。