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In this paper, we have made a systemic theoretic research on modelling and reshaping several types of spline curves/surfaces in CAGD. And some creative productions are given as follows. At first, the uniform C-B-spline basis is proved to be a normalized totally positive basis, and can be extended to a normalized B-basis. C-B-spline and C-Bézier basis, similar to B-spline basis and Bézier basis in algebraic space, are two bases in algebraic trigonometric space.
本文围绕着CAGD中常用的几种曲线曲面造型和形状调整进行了深入的研究,主要获得了以下一些成果:首先,证明了代数三角空间中的n次均匀C-B-spline基是一组标准全正基,并进一步扩充为一组标准B基。C-B-spline基与C-Bézier基是多项式与三角混合空间中的两组基,是适应工程实践中设计特殊曲线曲面的需要而产生的,类似于多项式空间中的B-spline基与Bézier基,是CAGD中重要的造型工具。
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In other words, localization can be performed based on a general scene. In this thesis, we adopt Spatial Gaussian Mixture Model in image segmentation to describe an image viewed by the robot in spatial domain without any artificial landmark. Secondly, we use a modified combination algorithm by Cyr and Kimia to combine similar data. It is found out that a monotonic relationship exists among the scene registered and its neighborhood in terms of distance. This phenomenon can be used to assist to localize the robot and this work demonstrate the feasibility by several experiments.
本论文中采用高斯混合模型(Gaussian Mixture Model, GMM)来描述空间中的场景,将场景概念化,这样任意的场景皆可以用高斯混合模型来表达,而无需加入大量的人工场景,接著将所获取的每个希望校正点的资料采用由修改后的Cyr and Kimia的结合演算法来减低及统合资料,当场景接近原本的当初建立的场景,经由最大可能性大体上会呈现单调的特色,将辅助机器人修正回原本的位置,以达到协助机器人定位的目标。
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In addition, can also be combined with the occasional inclusion of the tea flowers, fruits to determine if they fruitlet tea, it is estimated that fruit size similar to mung bean, it can be judged for the spring, because the tea is usually in the 9 November insemination is to spend the spring During the tea is a time when the young began to grow.
另外,还可以结合偶尔夹杂在茶叶中的花、果来判断,如果发现有茶树幼果,估计鲜果大小近似绿豆,那么可以判断为春茶,因为茶树通常在9~11月现花授精,春茶期间正是幼果开始成长之际。
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There must be first, a vitious will' In his Introduction to the Principles of Morals and Legislation [2][2] under the heading 'Cases unmeet for punishment' Bentham sets out a list of the main excusing conditions similar to Blackstone's; he then undertakes to show that the infliction of punishment on those who have done , while in any of these conditions, what the law forbids 'must be inefficacious: it cannot act so as to prevent the mischief'.
在其《道德与立法原理导论》中22[2],边沁在"不适用惩罚的情况"这一标题下,列举了一连串与布莱克斯通所列情况相似的主要的免责条件。然后,他力图表明,对在任何这样的情况下实施法律所禁止的行为的人适用惩罚,"必定是无效的:它不可能起到防止损害的作用。"
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In conclusion, Schwann cells from wallerian degenerating facial nerves of rats might bear with similar biological characteristics and functional phenotype to those from sciatic nerves in vitro, and they might be able to produce soluble NTFs for trophic support on facial motoneuron cultures. The establishment of methods for obtaining high-purity facial motoneuron cultures of rats with partially labeled fluorescence should be of significance in contribution to further investigation on facial motoneuron's response to NTFs and other affecting factors.
综上所述,本文通过面神经雪旺氏细胞体外培养条件下生物学特性、功能表型,及其对培养面神经运动神经元细胞的营养活性作用的研究,为在体外条件下研究雪旺氏细胞对面神经运动神经元的营养支持作用时,如何选择细胞来源,提供了实验依据;建立了获得较高纯度并带荧光标记的面神经运动神经元的分离和体外培养方法,为进一步研究影响面神经生长、损伤后再生修复的因素奠定了实验基础。
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Moreover, the actual allele frequency of most varieties deviates far from Hardy-Weinberg equilibrium. All PPB、na 、I、h、Gi and Fst have proved to be the references to elucidate that ISSR is a most powerful tool to analyze genetic diversity, compared with the RAPD marker and the allozyme marker is less strong ordinally. We could divided the 70 samples into A, B, C, D and E five groups using three methods according to genetic distance clustering. There is a bit displacement for few varieties in different clustering maps, but the most are similar to morphological analysis despite that there is still a great difference among cultivars in the same one group. The above results imply that the three methods have the different sensitivity and resolution in genetic distance analysis of close varieties. The Mantel test indicates that the results from the three kinds of markers have the significant correlation, which demonstrates that the number of the used three kinds of markers is enough to exactly detect the diversity of all 70 samples to ideal extent. And these methods can be used to evaluate the diversity of the whole group using the miscellaneous samples instead of the individual sample, of the Gerbera jamesonii are mainly from tissue culture plants. In conclusion, the above study results provide a reference for the application of three kinds of molecular markers to molecular marker-assisted breeding of flower. 2. The genetic diversity among the eight introduced cut-flower varieties of Ranunculus asiatica was analyzed by the ISSR markers. Based on the genetic clustering tree, all the colorful flower varieties are clustered into one group, and the white flower varieties into another group. Moreover, among the former group the yellow flower varieties are clustered into one sub-group, and the reddish flower varieties, such as rose color, pink, nacarat, are clusetered into another sub-group.
由三种分子标记的分析结果可以看出,等位基因平均值、观察杂合度、Fis值、Fit值皆较高,表明非洲菊等位基因较丰富,杂合基因偏多,且绝大部份品种的实际等位基因频率在品种内偏离了Hardy-Weinberg equilibrium;PP8、na、Ⅰ、h、Gi及Fst皆表明,ISSR检测遗传多样性的能力最强,其次是RAPD,等位酶最低;根据遗传距离进行聚类,三种方法都把70个品种分成A、B、C、D、E五个大组,每一组中除少数品种发生位移外,大部份品种分类结果相似,且与形态分析结果有相似性,但在每一组中,品种间的聚类差别较大,表明这三种方法在近距离品种间检测遗传变异时灵敏度及分辨力不同;Mantel检测表明,三种标记的分析结果有显著相关性,表明所用的三种分子方法的标记数量已经可以相对无偏地检测到70个品种间遗传变异;非洲菊为组培苗,三种标记的检测结果皆表明,混合样品可以作为个体样品的代表,对整个居群的遗传多样性进行评价;这些研究结果可为三种分子标记方法在花卉分子辅助育种中的进一步应用提供借鉴。
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After some generations the population diversity would be greatly reduced and the algorithm might lead to a premature convergence to a local optimum. To circumvent these shortcomings, the chaotic dynamic system is introduced in the studies of chemometric algorithms. The chaotic mapping itself is very sensitive to the initial state in a manner similar to the statistical randomness but with its underlying patterns appearing to be phantasmagoric in a deterministic style.
神经网络是一个优异的非线性建模工具,但其突出的缺点就是潜在的预收敛到局部最优点或过拟合导致的错误预报模式;遗传算法用于优化过程其目的是为了避免陷入局部最优点,但事实上由于在传统遗传算法的进化过程中只有少数最好的成员被保留下来用于产生子代成员,经过一定代数的进化后群体成员的多样性就会显著下降,也很可能过早收敛到局部最优点。
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Perhaps you can think of a sudden stop to the bench and enough to the vase, which is the most critical step, often referred to as the inspiration (similar to the phenomenon of biological mutations, changes that have taken place here is to change the stool is so used to sitting concept), do this step you have to be "stool" and "their own bodies," the two concepts linked in the minds of, and conducted a pilot course of thinking: First of all, looked at the high stool, probably determine the If we stand on the next top is likely to be enough on a vase, and they feel that they can certainly climb up stool.
你突然想到也许可以通过站到凳子上而够到花瓶,这是最关键的一步,通常称为灵感(这个现象类似于生物中的突变,这里发生的变化是改变了凳子只是用来坐的这样的观念),做到这一步时你已经将&凳子&和&自己的身体&这两个概念在头脑里联系起来了,并且进行了一个思想试验过程:首先看了看凳子的高度,大概判断了下自己如果站在上头很可能就可以够着花瓶了,并且觉得自己肯定可以爬到凳子上去。
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From the above seems to show the failure, the author estimated that the fault is mostly the work of the subsidiary CRT circuit damage occurred because the cathode-ray tube voltage of the focus is very prone to failure similar to the above phenomenon, the phenomenon that gave rise to such failure is due mainly to display work over time, then the CRT focus very near the jack attached to a lot of dust very easily, which encountered wet dust easily lead to the air tubes of focus very significantly decrease the performance of socket contacts, then a cathode-ray tube focus to the natural voltage decline will be affected down, so that we could monitor the performance will be prone to poor focus, image display is a relatively vague.
从上面的显示故障现象来看,笔者估计该故障现象多半是显像管附属的工作电路发生了损坏,因为显像管的聚焦极电压十分容易发生类似上面的故障现象,引起这种故障现象的原因主要是显示器工作时间一长,那么显像管的聚焦极插孔附近很容易附着不少灰尘,这些灰尘遇到潮湿的空气后容易导致显像管的聚焦极插孔接触性能大大下降,那么一来显像管的聚焦极电压自然就会受到影响而下降下来,这样的话显示器也就容易出现聚焦性能不好、图象显示比较模糊的现象了。
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Say:"This very easy guess, must be black with white, be like people to say of black bottom white point the cloth be similar."
第一个说:&这很容易猜,一定是黑的和白的,像人们说的黑底白点布一样。&
- 推荐网络例句
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This one mode pays close attention to network credence foundation of the businessman very much.
这一模式非常关注商人的网络信用基础。
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Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.
扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。
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There is no differences of cell proliferation vitality between labeled and unlabeled NSCs.
双标记神经干细胞的增殖、分化活力与未标记神经干细胞相比无改变。