定向

It can be concluded that to meet with the ideal separation effect in a relative short period, the following optional selection of experimental conditions should be carried on strictly: centrifuge rotor and gradient medium, which will influence separation capability; gradient density range, shape and slope, which is very important in separation degree; the methods of reorienting rotor,low and high rotor speed exchange and Gmax could be used in order to shorten separating time.

通过研究认为在相对短的时间内要达到理想的分离效果，应该对以下实验条件进行优化选择并严格控制：包括实验中影响分离本领的转头、梯度介质选择；为获得满意分离度应严格选择梯度的密度范围、梯度形状以及梯度的斜率；为了缩短分离时间，可采用重定向梯度、二次变速及Gmax等方法。

Except one case, we can prove that the new graph operation preserving fully orientability.

我们会证明除了一个特殊的未知情况之外，这个新的图运算能保持图的可全定向性质。

We discuss the following graph operations that preserve fully orientability: the union of two graphs whose intersection is an edge, addition of a path of length at least 2 and addition of an edge between two vertices of degree 2 with a unique common neighbor.

我们会讨论下列几种能保持可全定向性质的图运算：将两个交集为一个边的图取联集、加入一个长度至少为2的路径及将两个度数为2且仅有一个共用邻点的不相邻点相连。

In order to implement Boolean operations on open or closed mesh models with different complexities correctly,a new algorithm for 3D mesh model by using Boolean operations is presented,which is based on the orientability of manifold meshes and the topological relationship of the meshes.

为了快速正确地对各种复杂程度的网格模型进行空间布尔运算，根据复式网格的可定向性建立各元素间的拓扑关系，并根据这些拓扑关系判断网格面片的最终去舍，得到布尔运算结果。

Using combinatorial thoughts and topological methods,a closed curve system that contains the most number of non-contractible,pair-wise disjoint and pair-wise non-homotopic closed curves on the orientable surface is investigated.

利用组合数学的思想、拓扑的方法研究在可定向曲面上，一类含有个数最多的不可收缩的、两两不相交、互不同伦的圈系统及其性质，得出了关于这些圈的一些拓扑定性性质，并给出这些圈在曲面上的位置分布。

Motivated by this problem, in this paper, we give an upper-embeddable property of one kind of digraphs in orientable surfaces.

受此问题的启发，本文给出了一类有向图在可定向曲面上是上可嵌入的性质。

Finally,further generalizes the given graphs to obtain a new type of graph and gives a description about genus distribution of orientable embeddings for this type of graph.

最后把上面图类进一步推广，得到了一类更一般的图，并对其可定向嵌入的亏格分布进行了刻画。

Market or that market, the company or those companies, Wang look at all unabated, orientable additional shares from the original "catalyst" into "agents of thin."

市场或市场，该公司或这些公司，王都有增无减，定向增发新股看从原来的"催化剂"变成"代理人薄。"

We prove that $2$-degenerate graphs, Halin graphs, graphs with maximum degree at most 3 and graphs with $d_{min} leq 1$ are fully orientable.

我们会证明所有的2-退化图、Halin图、最大度小於或等於3的图及dmin小於或等於1的图皆为可全定向的。

Effects of surface orientation on the isothermal and cyclic oxidation behavior of directionally solidified IC-6 alloy were studied by means of TGA, SEM/EDAX and SEM/EPMA.

采用TGA、EDAX及XRD等研究了定向凝固IC-6合金表面取向对其等温、循环氧化行为的影响。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。