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On the basis of theories of high-level visual processing subsystems and by following Sternberg's element-adding study pattern, serial studies were made to investigate the plasticity of visual cognitive ability in space. The results show that different degrees of plasticity and stability do exist in the cognition processing of visual space. Moreover, plasticity and flexibility in judgments of appearance swirl and quantitative spatial relationship and in command of visual characteristics are found greater in these studies than those obtained by means of appearance scanning, movement inference and judgment of categorical space relation.

视觉空间能力认知可塑性系列研究以高水平视觉加工子系统理论为基础,以斯滕伯格的加因素法为研究范式,通过对视觉空间任务的练习效应与年龄效应的检验表明,视觉空间认知加工中存在着的不同程度的可塑性与稳定性,结果显示出表象旋转、数量空间关系判断和视觉特征提取任务明显要比表象扫描、运动推断以及类别空间关系判断表现出较强的可塑性和易变性特点。

Luminescence evolutions of GaN irradiated by low energy electron beam before and after hydrogenation has been investigated by means of cathodoluminescence, combined with the diffusion properties of hydrogen in GaN.

本文结合氢在GaN中的扩散特性,运用阴极荧光谱,对氢化前后低能电子束辐照下GaN带边发光强度的演变进行了研究。

Firstly determine approximately the position of projection center by adopting the method of DR imagery, and then approaches the accurate position by means of point of golden section.

采用实验的方法,利用标准钢丝样本和直尺样本,先采用DR成像的方法大致确定投影中心的位置,然后利用黄金分割点逼近准确位置。

The experimental method was adopted, and the standard steel wire sample and ruler sample were utilized. Firstly determine approximately the position of projection center by adopting the method of DR imagery, and then approaches the accurate position by means of point of golden section.

采用实验的方法,利用标准钢丝样本和直尺样本,先采用DR成像的方法大致确定投影中心的位置,然后利用黄金分割点逼近准确位置。

By means of the qualitative and quantitative analyses on the characteristic of energy spectrum of the scaling functions, the stuitable region of this numerical method of inversion in the image by inversion is given.

通过对小波尺度函数的低带通谱特性的定性与定量讨论,给出了这一反演方法所得原像函数的适用域。

It is well known that the multi-value CDMA spreading codes can be designed by means of a pair of mirror multi-rate filter-banks based on some optimizing criteria. The dissertation indicates that there exists a theoretical bound in the performance of its circular correlation property, which can be described by an explicit expression.

研究了基于两带镜像多速率滤波器组来设计的多值CDMA扩展码的方法,并推导出了基于这种方法设计的码序列在循环相关特性方面所能达到的极限,以及达到此理论极限时应满足的条件;在此基础上,提出了一种基于熵最大化准则来产生CDMA扩展码的设计方法。

Any of various vascular plants that reproduce by means of spores rather than by seeds,including the ferns and related plants,such as club moss es and horsetails.

蕨类植物任一种通过孢子而不是种子繁殖的维管状植物,包括蕨类和相关的植物,如石松和马尾

By means of scientifically determining the membership function of each factor and establishing the weight of each factor by constructing the judging matrix through binary taxis, the optimal one was selected from nine schemes made up of different combination of room structural parameters, which could ensure not only safety production but also better economic profit.

通过合理确定评价指标的隶属度函数和利用二元排序法构造判断矩阵确定各评价指标的权重,对9种方案进行了综合评判,确定了最优方案,选出了合理的矿房结构参数,既可保证矿山的安全生产,又可保证矿山经济效益。

Based upon all above-mentioned, a mathematical representation for multi-material structures is proposed by means of vector level sets, and the general structure topology optimization can be expressed by a constrained functional minimization problem of a set of level set functions.

同时,还提出了在有效约束切空间上构造的非线性映射技术,以改进向量水平集的演化方向,可提高计算效率2到3倍。

Using level-set method, mathematical representation for contimuum structures is proposed by means of the vector of level-set, and the general structure topology optimization can be expressed by a constrained functional minimization problem of a set of level set functions.

其次利用水平集方法将一般拓扑优化问题描述为一组水平集函数的约束泛函极小化问题,应用敏度分析,给出了此泛函极小化数值迭代求解公式,即水平集演化方程。

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With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务,乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐,因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。

Closes the eye, the deep breathing, all no longer are the dreams as if......

关闭眼睛,深呼吸,一切不再是梦想,犹如。。。。。。