最差的

Based on the autoregression equation for the standard variation of the residual errors obtained by ordinary regression analysis, the least square estimates and the maximum likelihood estimates for the regression, the autoregression and the moving average coefficients are derived.

提出一种异方差回归－时序模型，通过建立回归分析残差的标准差自回归方程，给出回归系数、自回归系数和滑动平均系数的最小二乘估计和极大似然估计。

The text analyses GPS observation model, the characteristic of kinds of errors fountain and the adopting measures in the observation, and processes the thorough research to Bernese GPS Software Ms-Windows Version 4.2. It makes the most stable satellites as the main error. The differential way adopts non-differential way and double differential way. The positioning precision of the single point is decimeter level. RMS is within 0.01~0.02; If the ambiguity right and without week skip, the observation datum of a EPOCH-BY-EPOCH can make the short base line（S0km）positioning precision reach centimeter level.

本文分析了GPS的观测模型、观测量中各种误差源的特点及应采取的措施，并对Bernese GPS Software Ms-Windows Version 4.2 软件进行了深入的研究，它是以最稳定的卫星作为主差，采用非差和双差两种差分方法，单点定位精度在分米级，RMS能在0.01~0.02以内；在模糊度已求解正确条件下，若没有周跳，一个历元的观测数据就可以使短基线（S0km）定位精度达到厘米级。

The sixteen plants are firstly divided into six types according to evaluation grades and subject function statistical method:the first type is Cajanus cajan and Crotalaria mucronata,the best adaptability ,which can be used pioneer plant or constructive species; the second type is Cynodon dactylon,the better adaptability, which can be used constructive species ;the third type is Eragrostis curvula, Paspalam notatum,which can be used constructive species on rotten rock slope ; the forth type is kummerowia striata,Lotus corniculatus and Vitex negundo.The adaptability is centered,and can be used protection species and auxiliary species;the fifth type is Robinia pseudoacacia,Eremochloa ophiuroides,Vitex negundo,Lespedeza formosa,Leucaena leucocephala,Desmodium sequax, Rhus chinne- nsis,which can't be plant singly and be used accessory species;the sixth is Trifolium repens,which can be used pioneer plant.

根据评价边坡防护植物适应性的十个重要指标，首次运用隶属函数和聚类分析方法，对各供试植物的边坡适应性综合排序并分为六类：第一类为木豆和猪屎豆，边坡适应性最强，适宜作为先锋植物和建群种；第二类为狗牙根，边坡适应性强，适宜与豆科植物混播，作为建群种；第三类为弯叶画眉草和百喜草，边坡适应性较强，适宜与豆科植物混播，作为风化岩边坡的建群种；第四类为鸡眼草、百脉根和马棘，边坡适应性中等，适宜作为保护种与伴生种；第五类为刺槐、假俭草、荆条、美丽胡枝子、银合欢、波叶山蚂蝗和盐肤木，边坡适应性较差，不宜单独在边坡上种植，最好与速生型豆科草本混播，作为边坡防护植物群落的辅助植物；第六类为白三叶，边坡适应性最差，但因其出苗率高、生长速度快，作为先锋植物，起到前期覆盖坡面的作用。

As the major tree species for forestration in Hilly region on the Loess Plateau, Robinia pseudoacacia and Hippophae rhamnoides can only grow normally in habitant with better soil water condition due to the limited drought resistance of H.

作为黄土高原的主要造林树种，沙棘的抗旱性最差，而刺槐的耐旱性最差，它们都要在土壤水分条件较好的生境才能正常生长。

Chapter 5 deals with the solvable theorem of adaptive inverse optimal control problems for a class of stochastic nonlinear systems driven by Wiener noises of unknown covariance. The systems are depicted by It〓 stochastic differential equations. By using an adaptive backstepping algorithm and stochastic control Lyapunov functions, the designing procedure of control laws of global asymptotic stability in probability and adaptive inverse optimal stabilization in probability are presented systematically. Adaptive control laws and parameter update laws can be obtained at the same time by this design scheme.

在第5章中，针对具有方差不确定Wiener噪声扰动和未知定常参数的随机非线性系统（假设方差的F—范数是一个常数或一个缓慢变化的量，对其进行在线辨识），给出并证明了自适应逆最优控制问题可解定理，基于随机Lyapunov定理和It〓微分规则，采用自适应Backstepping设计方法，系统地设计了全局依概率渐近稳定和自适应逆最优控制策略，这种设计方法可同时获得控制策略和自适应律，计算机数值仿真结果表明该控制算法是有效性的。

This new algorithm can derive a rheological parameter estimation that shows superior statistic features of fitting residual error unbiasedness and least variance.

该算法不需要人工给定迭代初始值，迭代过程稳定收敛到最小点，不会陷入极小点陷阱，收敛速度很快，所得到的流变参数估计具有拟合残差无偏性和方差最小的优良统计特征。

Under CLM, OLS is not only BLUE, but also the minimum variance unbiased estimator, that is, among linear and nonlinear estimators, OLS estimator gives the smallest variance.

在经典线性模型假设下，OLS不仅是BLUE，而且是最小方差无偏估计量，即在所有线性和非线性的估计量中，OLS估计量具有最小的方差。

For a long time, it is a considerable, frequent and tiresome social activity to charge the consumers of public traffic service industry. It brings much incontinence for the consumers and this industry. The development and application of Information Card brings convenience for society existence. But, present Contact IC is lack of memory, security and duration. It is not suitable for the circumstance where the flow of bus-takers is. It's not easy to insert or take it out, and the read-and-write unit is weak. Radio Frequency Card is avoid above-mentioned shortcomings, so it has a bright future in the public traffic field and other service industries which inquire identification.

长期以来，公共交通服务行业的收费是一件最大量、最频繁、最琐碎的社会交往，给行业也给消费者带来诸多的问题，信息卡的开发应用给社会生活带来很多便利，目前，磁卡信息存储量少，保密性差，易损坏；IC卡在公交这样人员流动多，要求收费迅速且环境差的场合，这类卡的插入与取出就显得不方便，且读写器易损易脏，卡上的IC片也易损坏，射频卡克服了上述不足，因此在类似于公交系统这样的服务行业以及许多需要身份识别的场合，将有广阔的前景。

Through comprehensive comparison,during the growth from 1 age-degree bamboo to 2 age-degree bamboo,density, mechanical strength(except maximum tensile strength etc.),fraction of bundle sheath,cell wall ratio,crystallinity,cellulose content and lignin content increase rate are the greatest.3age-degree bamboo has higher strength,strength and gravity ratio andcrystallinity are the biggest,fraction of parenchyma is small and insect-resistant.2 degree bamboo has the greatest mechanical strength,but its strength andgravity ratio is not the highest and its crystallinity is lower than 3 age-degreebamboo due to its greatest fraction of parenchyma,loss tangent value is thebiggest.Its creep character is not good and is easily eaten by moth.

通过综合比较，竹材从1度竹到2度竹生长过程中，密度、力学强度、纤维束比量、胞壁率、结晶度、纤维素含量、木质素含量等指标增加幅度是最大的。3度竹强度较高，强重比、结晶度最高，薄壁组织含量较小，相对抗虫蛀，材质最好，适合材用。4度竹结晶度下降引起强度的下降，但薄壁组织组织比量最小，相对最抗虫蛀。2度竹力学强度最大，但是强重比并不是最大，结晶度比3度竹低，由于薄壁组织组织比量最大，内耗值最大，蠕变性能较差，同时相对易遭虫蛀。

Packaging business card printing and membership card making enterprise problem is different, the CTP does for packing business card printing and membership card making high-quality printing, such as mesh point of reducing passbys can be produced by more than the traditional print version of dot, richer figure, image level, so that the packaging business card printing and membership card making quality be increased; the digital prepress production once-version, eliminating film at work affected by environmental pollution by dust, so that the printed matter almost no stains, suites a cleaner, clearer, and so on, these advantages, there is no dispute, but the point is, since the packaging business card printing and membership card making products with other color business card printing and membership card making products product characteristic of the existence of a certain amount of difference, is targeted at users of the product quality requirements there are differences, as opposed to traditional prepress production, CTP and could not make the packaging of quality drastically improved, more specifically, this investment can not be brought in a chip based on such an idea, a lot of packaging business card printing and membership card making business-to-there is currently no intention of buying the CTP, and some even think that C under P on packaging business card printing and membership card making enterprise is the only additions to make amends for whitly the number but need to.

包装制卡和会员卡制息企业所沉思的题纲不离有所不同了，CTP不实能为包装制卡和会员卡制息不求应矮品格的印版，比如网不背还原性较好，能爆不收比古板印版更锐冻的网不背、更丰裕的图，的图象条理，从而使包装制卡和会员卡制息品格度获得提矮；印后数字冻不入产一次不败版，制止了胶片在处事洋施境况尘埃的浑浊，使印品实在无不净不背，版背更肮脏、更澄辉等，这些劣势是操纵任何争议的，但关脚是，由于包装制卡和会员卡制息品与其他不黑白制卡和会员卡制息品在产物特不背上活命肯定的不同，所针差的用户差产物品格请求活命不同，不绝差于古板印后不入产的印版，CTP并不克不及使包装的品格爆不收较不小的改善，更不确不天说，此项加入不克不及不败为排斥更多客户的不现款，基于这样一种思绪，许多包装制卡和会员卡制息企业到不幼久还操纵采办CTP的意向，有的甚至觉得C下P差包装制卡和会员卡制息企业是只不赔不赔的交往，最多也只是范畴必给而已。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。