查询词典 symmetry

That is one of the best results in asymmetric catalyzed pinacol coupling reaction, which indicates that the tetradentate chiral Schiff-bases with C〓 symmetry and rigid structure may be developed into practical applications.

这说明，具有C〓对称性且其核心结构具有刚性的四齿Schiff--Base是最有希望获得有实用价值的新的手性化合物。

Expanding pinacol reductive coupling reaction into asymmetric one with both diastereoselectivity and enantioselectivity may lead to its application in synthesising medicaments and biologic active compounds with structure of vicinal diol. Asymmetric pinacol coupling reaction is also the most compact and effecient method in synthesizing chiral ligands or chiral auxiliary with C〓 symmetry.

将这一反应发展成为既有高度的非对映选择性，又有高度对映选择性的不对称偶联反应在合成许多含有手性邻二醇结构的药物或生物活性物质将有更重要的应用，同时不对称Piancol偶联反应也是合成C〓对称性的邻二醇多用途手性配体或手性助剂的最为简捷有效的方法。

Results show that for KEMAR mannequin,pinnae destroy the front-back symmetry of HRTF above 5～6 kHz,while for human subjects it reduces to 2.5 kHz because of the locations of ears.

结果表明，在5 kHz至6 kHz以上的频率，耳廓破坏了头相关传输函数的前后对称性；而受耳道入口位置的影响，真人受试者的头相关传输函数在2.5 kHz以上的频率就开始出现前后不对称。

It has been described as work that "relies on geometry and symmetry, fusing curvilinear shapes into pixilated, cleverly impressionistic jigsaw puzzles".

他的作品被称作「依托几何和对称，将曲线融入搞怪之中，机智运用印象主义的智力拼图」。

It is concluded that ions are condensed gradually in the process of heat treatment polytungstate acid,the symmetry of the WO6 octahedral is improved and the strength of the WOWbond is increased.

TG-DTA和IR分析结果表明，随着热处理温度的提高，薄膜中多聚钨酸离子进一步缩合，WO6八面体对称性逐渐增强。

At last ,this thesis discuss some prefatorial problems of symmetry in the world of physics.

最后，对对称性在物理世界中的一些前言问题做简要论述。

The quadrifilar helix antenna is widely used in the space communication, as it has globe symmetry band and good circular polarization.

四臂螺旋天线由于其优良的圆对称半球波束特性，良好的广角极化特性，在空间通信中得到广泛的应用。

The unusual quality of one tie up of the space-energy make the gravitation of quantum spatial measurement cosmic energy, lave the absolute point of unusual quality one tie up of in cosmic time-space, come to do not symmetrically gradually belong to stabilization thus at reductively fluctuate, not can reversely strides across reach the stable state of limitedly relatively not symmetry, come to do the circle of shut locus thus infinite continuous stable strides across.

宇宙能量的宇称量子的空间能使引力的一维奇性，偏离在宇宙时空中的一维奇性的绝对点，成不对称地递归于稳定而在缩小地波动，不可逆地跨越到有限地相对不对称的稳定状态，成为闭合轨迹圆而无限延续的稳定跨越。

A novel approach that uses distributed active agents to extract the basic reflectional symmetry axes in gray images is presented in this paper .

该方法可以提取任意灰度图像中的基本反射对称轴，并且易于并行实现，关于自然图像的实验结果表明了它的有效性。

In the following figures , shade the least number of squares to construct figures with reflectional symmetry .

在以下各图中，把作出反射对称图所需最少数目的正方形涂上阴影，并绘画各对称轴。

The circulation, consumption and reproduction of the trilogy have not only testified to its historical significance and literariness, but also invested it with new meanings.

该三部曲的流通、消费与再生产不仅验证了其历史意义及文学性，而切还赋予它以新的意义。

If he thought that he could buy me off, he would be wrong.

如果他认为他可以收买我，那他就大错特错了。