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Ferrifayalite is a Fe~(3+)-rich silicate mineral. It occurs in the Anshan type-like magnetite deposit of Liaoning Province. Ferrifayalites distribute unevenly and aggregate commonly as bands, with a percentage usually lower than that of magnetites, occasionally reaching to 10%. Crystals of ferrifayalite mainly xenomorphic granular, 0.25—0.7mm. to individually 1mm in diameter. Color blackish, luster submetallic with blackish brown streak. Cleavages of (100) distinct, (010) indistinct. Non magnetic but mediumly...

Ferrifayalite is a Fe~(3+)-rich silicate mineral. It occurs in the Anshan type-like magnetite deposit of Liaoning Province. Ferrifayalites distribute unevenly and aggregate commonly as bands, with a percentage usually lower than that of magnetites, occasionally reaching to 10%. Crystals of ferrifayalite mainly xenomorphic granular, 0.25—0.7mm. to individually 1mm in diameter. Color blackish, luster submetallic with blackish brown streak. Cleavages of (100) distinct, (010) indistinct. Non magnetic but mediumly electro magnetic. Hardness 5.5—6.5 S. G. 3.967.Opaque. Under reflected polarizing microscope, grey in color, anisotropic and with distinct bireflexicon (reflection-pleochroism). Indices of refraction were calculated from reflectivities : ∥ cleavage, N_(546)=2.03±0.04, N_(589)=2.01±0.04;⊥cleavage, N_(546)=2.04±0.04, N_(589)=2.03±0.04. Biref. △_(546)=0.01; △_(589)=0.02.Chemical composition of ferrifayalite rather simple and stable Pe_2O_3 content high, occasionally reaching to 45.1%. Th crystallochemical formula is Fe~(2+)Fe~(3+)(SiO_4)_2.Monoclinic in system. Space group C_(2h)~5-P2_1/b.a=4.808, b=10.171, c=5.824, α=90°.X-ray powder strong lines: 3.488(10), 2.774(9), 2.521(10), 2.405(7), 2.246(7), 1.745(8) etc., some with scattering phenomena.In the curve of D. T. A., there is one heatemitting peak at 700℃.In the infrared absorption spectrograph there are SiO_4 deformation vibration at 840—1120 frequency region.In single crystal structure analysis uses were made with equi-inclination weissenberg multiple film method according to olivine orientation. We had collected seven sets of diffraction photographs of 0kl-2kl, hk0-kh2, hOl, totally 246 independent diffraction spots. The photographs show V_h-D_(2h)-mmm laue symmetry, and on account of the crystal possessing neither gliding plane n nor symmetrical plane m of the spacegroup of olivine D_(2h)~(16)-Pbnm, it is thus determined the sole space group to be C_(2h)~5-P2_1/b. The parameters of the coordinates of every kind atom are determined after crystallochemistry principle and Patterson projection pattern. R_(oxt)=0.23, R_(hko)=0.21.The crystal structure analysis shows that ferrifayalite is an independent mineral with ordered vacant lattice position olivine type structure. It shares some features in common with that of olivine structure type, including a similar orientation of the tetrahedron, but it is different from olivine structure type in consisting of the edgesharing octahedral linear chains instead of the zigzag chains. Fe~(2+) situate at the center of symmetry of olivine, but it is vacant in this mineral at (0, 0, 1/2) and (1/2, 1/2, 1/2) symmetrical centers. Thus the structure becomes an ordered vacant lat- tice position structure.The cleavages, hardness optical properties etc. can all be properly explained with structure.After comparing the chemical composition, physical properties and size of unit cell of this mineral with that of MnO_2-bearing ferrifayalite informed by I. W. Ginsburg, the authors of present paper believe that these wo minerals possibly belong to the same kind of mineral, but the structure as they thought is quite different to ours.

高铁铁橄榄石(ferrifayalite)是富含Fe~(3+)的硅酸盐矿物,产于我国辽宁省似鞍山式磁铁矿矿床中。它在矿石中分布不均匀,多呈条带状产出,含量一般低于磁铁矿,有时含量可高达10%,晶体主要呈他形粒状,粒径0.25—0.7毫米,个别达1毫米。黑色,半金属光泽,条痕为黑褐色,(100)解理清楚,(010)解理不清楚。有中等磁性,具中等电磁性,硬度5.5—6.5,比重3.967。在偏光镜下不透明,反射光下为灰色,非均质,双反射清楚,折射率是由反射率换算的,在‖解理时N_(546)=2.03±0.04,N_(589)=2.01±0.04;⊥解理时,N_(546)=2.04±0.04,N_(589)=2.03±0.04;重屈折△_(546)=0.01,△_(589)=0.02。化学成分简单,较稳定,Fe_2O_3含量高,可达45.1%,结晶化学式为Fe~(3+)Fe_2~(3+)[SiO_4]_2。该矿物属单斜晶系,空间群为C_(2h)~5—P2_1/b。a=4.808,b=10.171,c=5.824,α=90°。粉晶强谱线有:3.488(10),2.774(9),2.521(10),2.40...

高铁铁橄榄石(ferrifayalite)是富含Fe~(3+)的硅酸盐矿物,产于我国辽宁省似鞍山式磁铁矿矿床中。它在矿石中分布不均匀,多呈条带状产出,含量一般低于磁铁矿,有时含量可高达10%,晶体主要呈他形粒状,粒径0.25—0.7毫米,个别达1毫米。黑色,半金属光泽,条痕为黑褐色,(100)解理清楚,(010)解理不清楚。有中等磁性,具中等电磁性,硬度5.5—6.5,比重3.967。在偏光镜下不透明,反射光下为灰色,非均质,双反射清楚,折射率是由反射率换算的,在‖解理时N_(546)=2.03±0.04,N_(589)=2.01±0.04;⊥解理时,N_(546)=2.04±0.04,N_(589)=2.03±0.04;重屈折△_(546)=0.01,△_(589)=0.02。化学成分简单,较稳定,Fe_2O_3含量高,可达45.1%,结晶化学式为Fe~(3+)Fe_2~(3+)[SiO_4]_2。该矿物属单斜晶系,空间群为C_(2h)~5—P2_1/b。a=4.808,b=10.171,c=5.824,α=90°。粉晶强谱线有:3.488(10),2.774(9),2.521(10),2.405(7),2.246(7),1745(8)等,线条有弥散现象。差热分析曲线上700℃处有一放热峰。红外光谱在460—620频率段为SiO_4为变形振动,840—1120频率段为SiO_4的伸缩振动。单晶结构分析系用等倾斜魏森堡多重胶片法按橄榄石定向,共收集了0kl—2kl,hk0—hk2,h0l七套照片,246个非零独立衍射点。照片上显示出V_h—D_(2h)—mmm劳埃对称,因为在[010]方向的魏森堡图上见到约40%的h+l=2n+1弱衍射点以及在P(VW)原子间向量投影图上没有P(OW)的哈格峰,这就证明晶体中不存在橄榄石空间群D_(2h)~(16)—Pbnm中的n滑移面和m对称面。所以确定唯一空间群C_(2h)~5—P2_1/b。各种原子的坐标参数是根据结晶化学原理和原子间向量投影图确定的R_(okl)=0.23,R_(hko)=0.21。晶体结构分析表明,高铁铁橄榄石是一具有序缺席橄榄石结构型的独立矿物,在结构上具有橄榄石结构的某些相同特征,包括一个相同的四面体方位,但所不同的是以公用稜连结的八面体直链代替了锯齿状链。Fe~(2+)位于对称中心1上。但本矿物在(0,0,1/2)及(1/2,1/2,1/2)对称中心位置上Fe~(2+)作有序空缺席来实现。矿物的解理、硬度、光性等物性在结构上都得到合理的解释。作者对高铁铁橄榄石结构分析时发现该矿物与铁橄榄石之间存在一个Fe~(3+)代替Fe~(2+)的异价类质同象系列的问题。Fe~(2+)被Fe~(3+)按其xFe~(2+)换2/3xFe~(3+)的方式所代替,因此在一些等值结构位置上形成空缺,当空缺位置由无序缺席代替变为有序缺席代替时,其结果必然导致晶体结构由高对称变为低对称。高铁铁橄榄石就是这种量变到质变的产物。它属于不完全的类质同象系列。按元素周期表对角线发展的类质同象代替规律,作者认为也适用于过渡元素的异价离子间的置换,从高铁铁橄榄石这一事实与在其他硅酸盐矿物中所观察到的情况是一致的。根据矿物的化学成分、物理性质及晶胞大小与I. W.金兹堡等人所报道的含MnO_2Ferrifayalite比较,本文作者认为二者可能属于同类矿物,但他们认为该矿物是由锰铁橄榄石+Fe_2O3、+SiO_2三个物相所组成的非独立矿物,他们推测该矿物的结构与本文显然是不相同的。

Dalinghe Turbidite is a group of very thick sandstones and conglomerates interbe- dded within a set of dark grey claystones,the Third Interval of Shahejie Formation of Oligocene.It may be subdivided into four sandbodies in vertical section;environmentally, these sandbodies are identified as upper and middle fan of a turbidite fan,respectiv- ely.Hydrocarbon accumulation in Dalinghe turbidite sandbodies takes advantage of the better matching between depositional facies and structure or fault.There are mainly four...

Dalinghe Turbidite is a group of very thick sandstones and conglomerates interbe- dded within a set of dark grey claystones,the Third Interval of Shahejie Formation of Oligocene.It may be subdivided into four sandbodies in vertical section;environmentally, these sandbodies are identified as upper and middle fan of a turbidite fan,respectiv- ely.Hydrocarbon accumulation in Dalinghe turbidite sandbodies takes advantage of the better matching between depositional facies and structure or fault.There are mainly four kinds of deposit-structural matching and then four kinds of trap for oil (gas) pools are formed.

大凌河浊积砂体,属下第三系渐新世沙河街组三段,为一套巨厚砂砾岩并夹于黑灰色泥岩之中,纵向上共分四个砂体,在浊积扇沉积部位分别属于上扇区和中扇区。大凌河浊积砂体的油气富集,取决于岩相带与断层、构造两者的有利配置。主要存在着四种有利配置,从而形成四类不同规模、不同圈闭条件的油气藏。

Charaters of Yanan group and Zhiluo group of Jurassic system in Jiaoping, Shanxi Province are discussed in aspects of lithology, lithofacies, cycle, and evolution.

本文从岩性、岩相、旋回及演化等方面讨论陕西焦坪侏罗系延安组和直罗组的沉积特征。岩性特征表明,延安组属灰色复陆屑建造,直罗组为红色复陆屑建造。根据沉积剖面结构、成因标志划分出河床滞留、河床、天然堤、决口扇、河漫滩、洪泛平原和岸后沼泽等相,组成具二元结构的旋回。作者重点剖析J_(1-2)y_2和J_2Z_1二段的剖面结构,确定前者为高弯度河,后者为低弯度河。延安组属于气候温湿、沼泽发育的冲积平原,后期转向半干旱气候。古河流由低弯度河向高弯度河,接着又向小型高弯度河方向演化。低弯度河两侧利于成煤。直罗组属半干旱气候的冲积平原,演化特征与上述情况相似,但无沼泽沉积。总之,本区随着构造向稳定状态发展,建造由构造控制转变为古地理控制。

 
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