查询词典 arcs

A semicomplete multipartite digraph is obtained by replacing each edge of a complete multipartite graph by an arc or by a pair of two mutually opposite arcs.

用一条弧或一对方向相反的弧代替完全多部无向图的每一条边所得到的有向图被称为是半完全多部有向图。2002年L。

This class of deposits is characterized by the abundance of iron oxide in the ores and the associated intensive regional sodic alteration. They may occur in Proterozoic intracraton or Phanerozoic continental margin volcanic arcs with nearby intrusive complex or evaporite. The spatially and temporally associated intrusive rocks are magnetite-series granitoids. Mineralization mainly occurs in second order echelon structures near the main regional structure.

该类矿床以矿石中含有大量的铁氧化物且伴有很强的区域性钠质蚀变为特征，可以产于元古代克拉通内或新生代大陆边缘岛弧环境，其周围具火成岩或含蒸发盐层，时空上与之有关的侵入岩为磁铁矿系列花岗岩，矿化主要产于近区域主断裂的羽状次级断裂中。

The Paleoproterozoic Beidahe Group-complex remains as continental shivers in the interior of the North Qilian orogen. In its early stage of development, there occurred abundant amphibolite. The protolith of the amphibolite is basalts. The Alk-∑FeO-MgO plot, REE features and Rittmann index show that the protolith belongs to the calc-alkaline suite and exceptionally shows the subalkaline character. The rock is characterized by higher Al2O3 and ∑FeO and lower Mg#, indicating that it has a higher degree of compositional evolution and that the formation of volcanic rocks is related to activation of older crust. Highly fractionated REE patterns and amphibolite on the Ti-Zr-Y plot, Ni-FeO/MgO plot and Ta/Yb-Th/Yb plot all indicate the characteristics of volcanic arcs and active continental margins. On the geochemical diagram of basalt, the overall REE features are in the main analogous to those of calc-alkaline island-arc basalt, with Sr87/Sr86=0.71617–0.72033,Nd143/Nd144=0.512414–0.512495 and εNd=–2.79 to –4.37,εSr=245.78–305.3, showing that the magma was derived from the crust or subjected to contamination with the lower crust below the continent.

提要：以大陆碎块形式残存于北祁连造山带内部的古元古代北大河岩群早期发育有大量的斜长角闪岩，其原岩为玄武岩，Alk—∑FeO—MgO图解，REE特征，里特曼组合指数等均显示斜长角闪岩属钙碱性系列范围，个别显示弱碱性，斜长角闪岩具有较高的Al2O3，∑FeO和低的Mg#，这些特点反映其成分演化程度较高，表明火山岩的形成与古老地壳的活化有关，有较强分异的稀土元素分配模式，在Ti—Zr—Y图，Ni—FeO/MgO图解和Ta/Yb—Th/Yb图解上斜长角闪岩均显示火山弧或活动大陆边缘的特点，在玄武岩的地球化学形式图，稀土元素整体特征与钙碱性岛弧玄武岩基本相同；87Sr/86Sr=0.716 17～0.720 33， 143Nd/144Nd=0.512 414～0.512 495，εNd=-2.79～-4.37。

A solar phenomenon known as a sundog arcs over the tundra in Churchill, Manitoba, Canada.

太阳的&假日&天文现象半悬于加拿大Manitoba丘吉尔苔原的天际。

Photo of the Day July 01, 2008 Sundog Light Phenomenon, Manitoba, Canada, 2005 Photograph by Norbert Rosing A solar phenomenon known as a sundog arcs over the tundra in Churchill, Manitoba, Canada.

一种太阳的现象已知为幻日呈拱形越过冻土苔原在邱吉尔，Manitoba，加拿大。

And except for the transpolar arcs, the appearance frequences of other three kinds of aurora are related with Kp index.

中山站进入极光带的时间通常在午后，具体时间也与Kp指数有关

The active surges mostly appear around midnight, while the transpolar arcs mainly occur after midnight.

除向日极光弧外，其它形态的极光在中山站的出现情况与Kp指数相关。

By experiment of arc movement process, the viewpoint that arc is split or unsplit into series arcs by deion plates is improved.

通过对电弧在不同结构灭弧室中运动情况的试验分析，提出了电弧能否分成短弧进入栅片的理论观点。

Ablation-controlled arcs compensated by materials being ablated from the capillary wall are of great interest.

通过衬套材料消融补充等离子体从而控制电弧生长的技术具有很好的应用前景。

This paper gives an algorithm for obtaining linesegment and circular arcs by approximating data points and its rigorous proof.

本文给出了一种通过数据点逼近生成直线段和圆弧的算法及其证明。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。