最小量

With the concept, the fractional lower array power is formulated and it is theoretically proved that the power is finite and reasonable for beamforming, provided thatthe fractional order does not exceed the half of the noise characteristic exponent.

根据分数低阶统计量和零阶统计量，这部分提出强冲击噪声环境下表现出稳健的波束形成性能的三种新的波束形成算法：分数低阶最小方差无畸变响应波束形成算法、线性约束最小几何功率波束形成算法和最小几何误差波束形成算法。

In the past, the high frequency resonance technique is usually applied in the envelope detection for a vibration signal with amplitude modulation. When applying the Hilbert transform in the high frequency resonance technique for the envelope detection of vibration signals, the computing burden is very high. On the other hand, when applying the linear least squares analysis method, the computing burden is lower. When applying the envelope detection in the lowest vibration mode, an accelerometer with the low-pass filtering cutoff frequency at 4kHz should be choose.

在过去的研究方法中，振动讯号之振幅调变通常以高频解调分析法应用於包络讯号侦测，而高频解调方法应用希尔伯特转换的包络分析，所需要的计算量是非常的高，若以线性最小平方分析法应用於高频解调分析法中，则所需要的计算量较小，如果以最低模态来估测包络讯号时，可以适当的选取加速规来代替低通滤波器，而加速规的截止频带必须在4kHz左右。

The results indicate that for the same aperture Φ of the prism,Ahrens Nicol prism has the least beam translation,and Thompason inversed Nicol prism has the biggest beam translation.

结果表明：对于相同的棱镜孔径Φ，阿伦斯尼科耳棱镜产生的光束平移量最小，而汤普逊倒尼科耳棱镜产生的光束平移量最大。

According to the principle of gear modification, this paper presented a new method, which determines the modification of spur gear using the dynamic system identification and optimum control theory.

摘 要：提出了一种利用动态系统辨识与最优控制理论相结合确定齿轮修形量的方法：在实际工况下，通过实验采集直齿轮传动系统实际动态信号进行系统辨识，然后求取系统的最优控制，将其转换为振动最小的修形量。

An analysis of living example was carried out by the use of C language programming and obtained the tangential polar coordinates equation of the optimal pitch curve of noncircular chain wheel.

探讨了非圆链轮传动中，基于理论松弛量的非圆链轮节曲线的优选，建立了在最小理论松弛量时，非圆链轮节曲线优选的数学模型，并利用C语言编程进行了实例分析，得出了最优非圆链轮节曲线的切线极坐标方程。

Wear degree decreases, and the wear particle distribution curves become protrusive and precipitous gradually in the initial stage.

通过分析铜合金销与碳钢盘在干摩擦条件下相互对磨所产生的磨粒群和销试样磨损量，发现磨粒的累积分布和微分分布特性随磨损时间的变化而变化：在磨损开始阶段，磨损程度逐渐减小，磨粒群分布曲线由平缓变得逐渐凸、陡；达到磨损平衡状态后，磨损率达到最小，磨粒群微分布曲线的幅值达到最大，横向宽度达到最小；随着销与盘间互适性变弱，磨损程度增大，磨粒分布曲线变得越来越平缓，横向宽度逐渐增大；磨粒分布曲线随磨损时间的变化规律与磨损率随磨损时间的变化规律有明显的对应关系，可为科学诊断和预测摩擦学系统状态提供有用信息。

In chapter 1, regression models with censored data, LSE for censored regression models and LAD estimation for models with fixed censoring point are introduced. Then, we state our main results for LAD estimator of nonlinear regression models with randomly censored data, including consistency, boundedness in probability and asymptotic normality. The proofs of our main theorems are given in detail. In chapter 2, we state the main difficulty of obtaining numerical solution for censored LAD estimation, and recall the history of studies on this problem including some anterior algorithms.

在第一章，首先介绍删失线性回归模型的基本概念和性质，并对已有的估计方法，如最小二乘估计、固定点删失的最小一乘估计等做了简单的回顾；然后，把固定点删失线性回归模型的最小一乘估计方法推广到了随机删失、非线性模型的情形，并得到了估计量的一些渐近性质，如相合性、渐近正态性等；最后，给出主要结果的详细证明过程。

It should be the same important for inventory management in hospitals about inducing inventory cost and higher service level. Many researches have proved that EOQ /ROP model can decrease total inventory cost, but few discuss the impact on stockout.

在存货管理上，成本与服务是天平的二边，一昧的降低存货成本或提高服务水准都不是最适化的管理。1915年Harris提出经济订购量(Economic Order Quantity， EOQ)模式，以总成本最小的概念决定订购量，此理论也广泛的应用在各产业中。

By time-varying filtering, we realize the signal selectivity and interference suppression, especially for the signals with time-varying power spectrum. It is shown herein that conventional eigenstructure based methods are lower dimensional special case of the time-frequency subspace fitting method. The closed-form array response estimation algorithms for blind source separation in wireless communication is also developed in the dissertation by exploiting the data structure of second-order statistics of the array output in the presence of multipath. The proposed method achieves array response estimation with little constraint on signal property and propagation environment such as scatters or angular spread. Moreover, the array utilized here can be of arbitrary geometry and even uncalibrated. Since the closed-form solution is obtained, no misconvergency may occur and large amount of computation can be saved. The equivalent feed model and corresponding optimization designation are proposed to realize the downlink multi-user selective transmission. By coherent and non-coherent superposition of the electromagnetical field, multiple beams can be formed using a single array, so that each co-channel user signal is transmitted in each beam and will not interfered with each other. The proposed system scheme implements the digital beamforming and the channel allocation in the base band, therefore is suitable for the utilization of the radio software technology. The feasibility and effectiveness of the proposed model are proved by the RF experiment.

在窄带条件下，GSC－SSF方法还可以提高阵列的虚拟孔径，从而提高估计的性能；可以证明，Cyclic DOA 和SC-SSF方法可看作该方法的特例或近似； 3、提出了二维GSC－SSF方法和宽带谱相关DOA矩阵方法，利用信号的循环平稳特性解决了宽带条件下二维 DOA 估计问题，并具有阵元数少、计算量较小的特点； 4、提出了时频子空间拟合和宽带时频DOA估计算法，将联合时频分析的理论和方法引入到阵列信号的空间谱估计研究中，利用时变滤波实现信号选择性测向和干扰抑制，特别适合于谱时变信号；可以证明传统特征结构法可看作是时频子空间拟合方法的特例； 5、提出了多用户环境下阵列响应的估计方法——CARE方法，该方法对信号结构和传播参数（主要是散射源分布与角度散布）的约束较少，适用于各种几何结构的阵列甚至未校准的阵列，能够直接得到阵列响应的闭式解，因此计算量小、稳健性好，不存在收敛问题； 6、提出了针对多用户下行选择性发送的阵列等效激励模型、优化设计方法及其系统实现方案，通过空间场的相干叠加与非相干叠加使得单一阵列能够形成多个波束，并保证各波束内的用户信号各不相同且相互干扰最小；其系统方案具有在基带实现数字波束成形、信道分配并便于软件无线电实现的特点，其有效性已得到外场实测数据的证实。

Simultaneously founding the mechanical modelof the seeder and analyse engine's libration when it was running at 50r/s,42r/s,38r/s,25r/s,7r/s influence on arranging seeds and use damping spring and latex to reduce libration about this part. Analysed the treading and swerving capability of the Paddy direct-seeding machine. Research results indicate: only boat motherboard's front across baffle's angle is 30 degree, the section shape of motherboard is undee, depth of section is 30mm, direct seeding engine stepped resistance and soil is least, turning

研究结果表明：当船底板前横挡板角度为30度、底板截面形状为波浪形、底板截面深度为30mm时，直播机在行走时行走阻力最小，壅土最少，转弯时转弯阻力最小；当发动机38r／s时，发动机对排种盘的振动影响最大，加刚度为100N／mm的减振弹簧或厚度为35mm的橡胶后，排种盘的振动量会大大降低，减振后的振动对排种无重大影响；仿真结果还显示，排种器力学模型、直播机行走、转弯性能和排种性能合理。

What are your goals and strategies for growth?

你的成长目标和策略是什么？

And unto the angel of the church in Sardis write; These things saith he that hath the seven irits of God, and the seven star I know thy works, that thou hast a name that thou livest, and art dead.

3：1 你要写信给撒狄教会的使者，说，那有神的七灵和七星的，说，我知道你的行为，按名你是活的，其实是死的。