零类

Furthermore, the first-order optimality condition and its equivalent reformulations for generalized semi-infinite max-min programming with a non-compact set are presented using the lower-Hadamard directional derivative and subdifferential.2. Chapter 3 studies the gradient-type methods for unconstrained optimization problems. Section 1 proposes a new class of three-term memory gradient methods. The global convergence property of the method is established. Furthermore, in order to improve the convergence property of the method, a new class of memory gradient projection methods is presented with the property that the whole sequence of iterates converges to a solution to the problem under the conditions such as pseudo-convexity and continuous differentiability of objective function. In section 2, two new classes of methods, called gradient-type method with perturbations and hybrid projection method with perturbations, are proposed. In these methods, non-monotone line search technique is employed, which makes them easily executed in computer.

第3章研究了无约束优化问题的梯度型算法，第1节提出了一类新的三项记忆梯度算法，讨论了算法的全局收敛性，进一步提出了一类新的具有更好收敛性质的记忆梯度投影算法，并证明了该算法在函数伪凸的情况下具有整体收敛性，第2节在非单调步长搜索下提出了带扰动项的梯度型算法及其混合投影算法，这两类算法的一个重要特征就是步长采用线搜索确定而不象许多文献中那样要求步长趋于零，这样更容易在计算机上实现，在较弱的条件下证明了这些算法的全局收敛性，数值算例表明了算法的有效性。

It may be issued at a discount, or it may be stripped of its coupons by a bank and then repackaged as a zero coupon bond.

这类债券可以在发行时加入折扣，或由一家银行除去息票，然后包装成为零息票债券发行

Examples illustrate that some special properties of the diagonally dominant matrix with chain of non-zero elements probably doesn't come into existence for quasi diagonally dominant matrix with chain of non-zero elements.

譬如目前关于拟对角占优矩阵的判定定理就有数十条之多[6-7]，至今仍有许多相关结论发表，其中杨志明[1]给出了拟具非零元素链对角占优矩阵的定义，并就这类矩阵的特征值的分布情况进行了讨论。

The digital simulation can be used to obtain correct fundamental and third harmonic zero sequence voltages at the neutral and the terminal of the generator and flexiblely study the characteristics of various generator stator ground fault protection schemes.

为了研究这类方案，需正确地了解正常与故障条件下中性点与机端零序电压的分布情况。由于不可能在真机定子绕组上人为设置接地故障点，从而给继电的保护研究和调试带来了困难。

Moreover, by employing the product technique, based on the generalized Chirp-like sequence set, two new classes of approximately optimal polyphase sequences with zero correlation zone can be easily generated.

此外，利用序列乘积的技巧，基于广义Chirp-like序列族，本文得到了两类新型实现简单的渐进最佳多相零相关区扩频序列。

Exotic figures from the Arabian Nights and such fabulous personages as Jack and the Bean Stalk enchant the children as well as their parents.

一千零一夜》里充满异国情调的人物，还有象《杰克和豆株》这类寓言中的角色，不但迷住了孩子们，也使他们的父母们心醉神往。

Different from the traditional approach of solving GDA by singular value decomposition,the new algorithm utilizes kernel modified Gram-Schmidt orthogonalization algorithm to extract the optimal transformation matrix directly,which can not only effectively hold the most discriminant information in the null space of within-class scatter matrix,but also make the solution more stable in numeric.

与传统用奇异值分解获取目标特征子空间的方式不同，新算法运用核修正格兰-施密特正交化过程直接提取最优投影变换矩阵，不仅有效地地保留了类内散度矩阵最具辨别力的零空间信息，同时使所求解在数值上更稳定。

According to the current serve as the criterion,and protects decomposing the electrical machinery flowing and carringon the back order and three big kinds of protection null sequence for crossing,but hence what from this forms the integrated protection basic overlay electromotor own the common barrier type.

摘 要：依据电流为判据，将电机保护分解为过流、负序和零序保护3大类，由此构成的综合保护可基本覆盖电动机的所有常见故障类型。

These structures include Double Nominative, Existential Constructions, Pseudo Passives, Null Element, Periphrastic structures, Subject-predicate disagreement. This study aims to investigate the general characteristics of topic-prominent typological interlanguage development of the Chinese English learners in terms of acquiring subject-prominent English syntactic structures in a systematic way.

本实验主要关注三组中国学生在即时口头任务和谨慎翻译任务中出现的六类不同的中介语话题突出类型结构，分别为：双主语结构、存在结构、假被动语态、零成分、迂回结构和主谓不一致。

A novel approach to design zero correlation zone like polyphase codes based on genetic algorithm is proposed.

针对这一问题，提出了一种基于遗传算法的类零相关多相码设计方法。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。