查询词典 chemistry

The performance and mechanism of corrosion inhibitions of POCA were studied bymethods such as weight-loss, electrochemistry, EDS, XPS and quantum chemistry. It isfound that POCA is cathodic corrosion inhibitor, having synergistic effect with HEDP andZn~(2+). The P and O atoms of phosphono have important electron density contribution toHOMO orbital and the electron gross orbital population is bigger than 1, so it is easy toform absorbing location between phosphono and metal resulting in good corrosioninhibition on mild steel.

通过利用失重法、电化学方法、扫描电镜、X光电子能谱、X-射线能谱和量子化学方法研究膦酰基羧酸的缓蚀性能及其机理，发现POCA是一种阴极型缓蚀剂，与HEDP、Zn~(2+)具有优良的协同增效作用；POCA分子中的膦酰基基团的P原子和O原子对HOMO轨道电荷密度贡献较大，且其轨道电子布居数均大于1，因此比较容易通过膦基与金属形成吸附位而对碳钢具有良好的缓蚀作用；对铜合金具有一定的腐蚀作用，但腐蚀作用比HEDP等有机膦药剂要小得多，同时与BTA具有优良的相容性，添加1mg／L的BTA则可以有效地防止铜合金的腐蚀。

Several transient compounds were synthesized by the homo- and heterogeneous reactions of reactive halogen compounds, In-situ ultraviolet photoelectron spectroscopy and photoionization mass spectroscopy as well as theoretical calculations were used to study their molecular structures, stability and molecular orbital properties, their electronic structures and geometric structures were obtained for the first time; Simultaneously, the electronic structure and thermal dissociation of acetyl peroxynitrate and trifluoroacetyl peroxynitrate which have great importance in the atmospheric chemistry were studied; The substituent effects of series of halopyridines and halothiophenes were studied by the ultraviolet photoelectron spectroscopy method for the first time. The atmospheric chemical reaction between peroxyacetyl radicals with IO radicals as well as the dissociation of the most stable isomer of CH3COIO3 were calculated by density functional theory, it was found that the CH3COOIO2 isomer may be act as a new reservoir of inorganic iodine in the stratosphere.

通过活性卤素的系列均相与非均相化学反应合成了几种瞬态物种，采用原位紫外光电子能谱和光电离质谱结合量子化学理论计算对化合物的分子结构、稳定性以及分子轨道特性进行了研究，首次获得了这些物种的电子结构和几何结构的信息；同时研究了大气中有重要作用的乙酰过氧硝酸酯和三氟乙酰过氧硝酸酯的电子结构性质及热解过程；采用紫外光电子能谱手段首次研究了系列卤代吡啶和噻吩的取代基效应；通过量子化学理论计算研究了乙酰基过氧自由基与IO自由基的大气化学反应及其最稳定异构体CH3COOIO2的解离，发现该物种可能是无机碘化合物在平流层中的储库物种。

Its well-defined crystal structure and surface abundance of silanol groups offer good supports to study the surface organometallic chemistry.

沸石分子筛是一类性能优良和用途广泛的无机材料，其确定的晶体结构和丰富的表面羟基为表面金属有机化学的研究提供了良好基体。

Content Five parts will be given: 1 the relationship of organometallic chemistry and Nobel Prize and its scientific meaning.

课程内容：课程主要内容有：1）金属有机化合物与诺贝尔化学奖的成果的科学意义。2）金属有机试剂在精细有机合成中的应用。

This volume of Topics in Organometallic Chemistry is designed to provide the specialist and non-specialist alike with a much needed overview of recent developments.

这卷的Organometallic 题目化学被用于提供无论专家还是非专家有非常需要的概述的新近发展。

Their just-published study in the Journal of Medicinal Chemistry shows that compounds containing the metals Ruthenium and Osmium can kill ovarian and colon cancer cells.

他们近日在美国《医学化学杂志》上发表报告称，他们发现用钌和锇制成的化合物，可以杀死结肠癌和卵巢癌的癌细胞。

It was a club overflowing with chemistry.

这是支充满了气势的球队。

THe application foreground on physics,biology,chemistry and overspeed optic communication is widened by the research.

进一步拓宽了超短脉冲在物理、生物、化学以及超高速光纤通信等领域的应用范围。

The AM1 method was used for a quantum chemistry study of the phenol hydroxylation reaction mechanism. The possible reaction path of the phenol and oxyhydrogen free radical was optimized, and the structures of stable intermediates in the reaction mechanism were also obtained.

本文还首次采用AM1方法对苯酚羟基化反应机理进行了量子化学研究，将苯酚与氢氧自由基的反应沿可能的反应路径进行几何优化，得到反应历程上相关驻点稳定构型的三维结构。

CuI is a P-type semiconductor material with 3.2eV bandwidth and stable performance in chemistry and physics. Its resistivity can be changed with concentration, and CuI film is transparent for visible band of light.

CuI是一种高带隙宽度的P型半导体材料，带宽为3.2ev，物理化学性质稳定，制备成本低廉，电阻率可随浓度改变，在可见光范围内透明等优点。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。