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It was found that the tetrahedrally coordinated Ti in the titanosilicate molecular sieve was the main reason to arise H2O2 decomposition as well as the effect of acid centers of the catalyst.

结果表明，分子筛骨架Ti和其拥有的酸性位是造成H2O2在分子筛上分解的主要原因，非骨架Ti对H2O2分解的影响弱于骨架Ti.H2O2的无效分解直接影响反应物的转化效率。

ESR and UV-vis spectroscopic investigations suggested that the tetrahedrally coordinated iron and vanadium species incorporated within the silica framework.

ESR、紫外可见光谱结果表明铁和钒以高度分散的四配位状态存在于分子筛的骨架中。

FT-IR and UV-vis spectra indicated the existence of tetrahedrally coordinated Ti atoms, which may act as active sites for epoxidation of olefin.

FT-IR和UV-vis结果说明该沸石骨架在存在四配位钛，从而有可能成为催化烯烃环氧化反应的活性中心。

Diffuse-reflectance UV-visible spectroscopy and Raman spectroscopy analysis show that bismuth atoms in Bi-SBA-15 exist in a highly dispersed state, and locate mainly at tetrahedrally coordinated sites.

此外，为了考察进入分子筛中的铋原子的分布，对所合成的样品进行了XPS表征。

Films are obtained via dip-coating process. The results show that the isolated and tetrahedrally coordinated Ti(superscript 4+) which formed Ti-O-Si bondon the pore inner surface of the framework.

实验结果表明，多孔薄膜中的钛离子形成了Si-O-Ti键的孤立四配位形态，使薄膜具有复合型钛离子的催化效果，并且有介孔结构。

The unusual feature of thiscompound can also be described in terms of infinite chains of B3O3 six-memberedrings sharing B atoms, which are all tetrahedrally coordinated by oxygen atoms.

例如，一维螺旋链结构的铀-有机配位聚合物[U3O732]-·H3O+，它的结构中存在由 U3O 构成的螺旋铀氧带。它也表现类似的铀酰发光。

Tetrahedrally coordinated iron in framework-substituted microporous AlPO-5 catalysts are shown to be active and selective for the hydroxylation of benzene to phenol, using nitrous oxide as the oxidant.

四面体配铁架构取代硅微孔-5催化剂载有选择性的活跃和苯羟化苯酚、使用笑气作为氧化剂。

The presence of the strong absorption band around 220nm in UV-Vis spectra and the appearance of the band around 960cm^(-1) in IR spectra demonstrate that the tetrahedrally coordinated Ti-atoms exist in the framework of Ti-containing zeolites.

UV-Vis光谱在220nm处的强吸收峰和骨架在960cm-1处的红外吸收峰均证明在沸石骨架中存在四配位Ti原子。

The octahedral Ti and anatase in the catalyst had a weaker influence on the decomposition of H2O2 than the tetrahedrally coordinated Ti.

了解H2O2无效分解的原因，有利于设计出高活性钛硅分子筛。

ITQ-26 (INSTITUTO DE TECNOLOGIA QUIMICA number 26) is a new crystalline microporous material with a framework of tetrahedral atoms connected by atoms capable of bridging the tetrahedral atoms, the tetrahedral atom framework being defined by the interconnections between the tetrahedrally coordinated atoms in its framework.

ITQ-26(INSTITUTO DE TECNOLOGA QUMICA number 26)是新的结晶微孔材料，其具有通过能够桥联四面体原子的原子连接的四面体原子骨架，该四面体原子骨架通过其骨架中四面体配位原子之间的相互连接来界定。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。