查询词典 atom

These compounds are of substantial interest both inviewpoints of theory and practical applications, mainlyunder the stimulus to achieve synthetic models either foractive sites of iron-sulfur proteins or for transitionmetal catalysts. This thesis describes the synthesis, structures andconformations of 51 new iron-sulfur cluster complexes,which have been characterized by elemental analysis andstandard spectroscopic methods. In addition, single-crystalX-ray diffraction analyses were performed for 4 representa-tive new compounds. Reactivities of μ-〓 with mono- and di- Grig-nard reagents derived intermediates toward various organicelectrophilic substrates were studied, along with complexa-tion of arynyl-containing iron-sulfur clusters by 〓Thus, several bridged, non-bridged, monomeric, dimeric,homonuclear, heteronuclear iron-sullfur and iron-sulfur co-balt-carbon cluster complexes were synthesized. A novelreaction and convenient route for the synthesis in highyield of tetranuclear iron complexes 〓 containing atetracoordinated sulfur atom was discovered, whereas aplausible mechanism based on experimental results was propo-sed for the formation of the new cluster type.

鉴于有机铁硫原子簇化学在基础理论发展和应用方面的重要意义，因此我们开展了这一课题的研究，并取得以下主要成果： 1、本文共合成了51个新有机铁硫及含钴碳簇基的有机铁硫原子簇配合物，除用元素分析，NMR，IR，MS法表征其结构和构象外，还用X-光衍射技术测得四个代表性配合物的单晶结构和构象； 2、我们业已发现炔基Grignard试剂同〓可形成一种&开环&与&闭环&中间物的平衡混合物，研究该平衡混合物同各种亲电试剂的反应； 3、研究发现了一种可高产率地形成〓含〓四配位硫挛合簇的新化学反应并对此反应提出了—种有趣的反应机理； 4、首次由1，4-二溴丁烷双Grignard试剂与〓制得一种新型铁硫簇双硫阴离子活性中间体，并进而研究了它的亲核反应性能； 5、找到了通过〓的光化学反应来合成簇合物〓-〓的一条有实用价值的新路线。

To determine the uncertainty of the content of arsenic in monosodium glutamate with Hydrid Atom-fluorometry.

目的 确定氢化物原子荧光光度法测定味精中砷的不确定度主要来源，从而提高测定的准确性。

Methods Hydrid Atom-fluorometry was applied to determine the uncertainty of arsenic content.

采用国家标准GB/T 5009.11-2003氢化物原子荧光光度法对味精中砷测定的不确定度进行评定。

The basic characteristics of the Stark map of Ba atom are as follows: in weak-electric field, the Rydberg states with small angular momentum numbers show a quadratic Stark effect, and those with large angular momentum numbers no longer degenerate and show a linear Stark effect, which is hydrogenic.

研究结果表明：在弱电场下，低角动量态由于具有较大的量子亏损而随着电场强度显示出二次Stark效应；而高角动量态由于量子亏损为零，并在电场下解除简并，随着电场强度的增加而呈现线性Stark分裂，具有显著的类氢性质。

The method of Hydrogenide generate-atom fluorescence spectrum is used to determinate the trace selenium elements content in electrolytic manganese.

运用条件试验，精密度实验及回收率测定对氢化物发生－原子荧光光谱法测定低硒电解锰中微量硒进行试验和研究。

We should set up the quick and accurate method of Hydrogenide generate-atom fluorescence spectrum for the determination of the trace Selenium elements content in Electrolytic Manganese, advance exit of Electrolytic Manganese.

建立氢化物发生－原子荧光光谱法测定低硒电解锰中微量硒的快速、准确的检测方法，促进低硒电解锰的出口。

In thecase of hyperspherical coordinates,the Schrodingerequation for many-electron atom can be changed into asimple second-order coupled hyperradial differentialequation,which indicates that it may be exactly solved.

超球坐标下，多电子原子的〓方程，可化为形式上非常简单的二阶超球径耦合常微分方程，这就预示了严格求解的可能性。

3DAP constructional atom map demonstrated that Si and Al are rejected from the alloy carbide, whereas Mn and V were inhomogeneously distributed.

非碳化物形成元素Si和Al主要分布在碳化物/基体界面处； V和Mn主要分布在碳化物内层，而Mo和Nb分布在整个碳化物区域。

Here, it is well-known that a photoexcited ketone undergoes an intersystem crossing to a triplet state and then abstracts a hydrogen atom from an organic molecule.

在这里，它是人所共知的一个photoexcited酮经历了一间通道的一个三重态，然后摘要一氢原子由一个有机分子。

A chromium free conversion coating at least equivalent in corrosion protective quality to conventional chromate conversion coatings can be formed on metals, particularly cold rolled steel, by a dry-in-place aqueous acidic liquid comprising: a component of anions, each of said anions consisting of at least four fluorine atoms and at least one atom of an element selected from the group consisting of titanium, zirconium, hafnium, silicon, and boron, and, optionally, ionizable hydrogen atoms, and optionally, one or more oxygen atoms; a component of cations of elements selected from the group consisting of cobalt, magnesium, manganese, zinc, nickel, tin, zirconium, iron, and copper; the ratio of the total number of cations of this component to the total number of anions of component being at least 1:5; sufficient free acid to give the composition a pH in the range from 0.5 to 5.0; a component selected from the group consisting of phosphorus-containing inorganic oxyanions and phosphonate anions; and a component selected from the group consisting of water-soluble and water-dispersible organic polymers and polymer-forming resins and, preferably, also including a component selected from the group consisting of tungstate, molybdate, silicotungstate, and silicomolybdate anions.

通过对包含以下成分的含水酸性液体进行干燥，可以在金属上形成无铬的转换涂层，该涂层与普通铬酸盐转换涂层相比，至少在抗腐蚀质量上等效：$_一种阴离子成分，所述各个阴离子包括至少4个氟原子，至少选自钛、锆、铪、硅与硼元素中的1个原子。任选地可离解的氢原子，任选地1个或多个氧原子；$_一种选自钴、镁、锰、锌、镍、锡、锆、铁与铜元素的阳离子成分，上述成分的阳离子总数与成分内的阴离子总数之比至少为1∶5；$_足够的游离酸以使该组合物的pH值在0.5～5.0的范围内；$_一种选自含磷的无机含氧阴离子与膦酸盐阴离子的成分；$一种选自水溶性与水可分散性有机聚合物与聚合物形成的树脂的成分，优选还包括一种选自钨酸盐、钼酸盐、钨硅酸盐与钼硅酸盐阴离子的成分。

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％。