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simple precursor
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  “simple precursor”译为未确定词的双语例句
     It was found t hat the contents of perovskite in cerami c powders synthesized at similar conditi on was different for different methods. B y the traditional method,(PbO+ZnO+Nb 2O 5+TiO 2) ,ceramic powder with lower cont ent of perovskite can be obtained. By the simple precursor method,(PbO+ZN+TiO 2), ceramic powder with higher content than for traditional methods can be obtained.
     XDR结果表明,相同合成条件下,不同合成方法得到的陶瓷粉末钙钛矿含量不同,其中,传统固相合成法(PbO+ ZnO+ Nb2O5+ TiO2)钙钛矿得率最低,简单先驱体合成法(PbO+ ZN+ TiO2)钙钛矿得率较高,复合先驱体合成法(PbO+ ZNT)钙钛矿得率最高。
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  相似匹配句对
     (c) it is simple.
     (c)简单 ;
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     It is simple to realize.
     新算法有效降低了路由开销,而且实现简单。
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     A simple design is employed to achieve the video-on-demand of the teletext as the precursor of the interactive TV.
     利用电视逆程作为交互电视的先导 ,采用了一种简单的设计方案 ,满足了图文电视节目的视频点播 .
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     A Feminist Precursor
     一个女权主义先行者
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     INDUCED EARTHQUAKE AND PRECURSOR
     诱发地震与诱发性前兆
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  simple precursor
Thus, tRNA4ys is not a simple precursor of tRNA2Lys.
      
The production of these compounds was performed by allowing simple precursor molecules to react under aqueous solutions, at moderate temperatures and short periods of time, with mediation by cyanamide or urea.
      
A simple precursor/product compartmental model was used to estimate fractional rates of conversion and incorporation.
      
We show that L-EGF is a secreted growth factor with a surprisingly simple precursor organization.
      
Kinetic studies provide strong evidence against a simple precursor product relationship between the free RNPs and all of the polysomes.
      
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The synthesis of perovs kite phase for Pb(Zn 1/3 Nb 2/3 ) 0.8 Ti 0.2 ceramic with different synthes is m ethods was studied by XRD.It was found t hat the contents of perovskite in cerami c powders synthesized at similar conditi on was different for different methods.B y the traditional method,(PbO+ZnO+Nb 2O 5+TiO 2) ,ceramic powder with lower cont ent of perovskite can be obtained.By the simple precursor method,(PbO+ZN+TiO...

The synthesis of perovs kite phase for Pb(Zn 1/3 Nb 2/3 ) 0.8 Ti 0.2 ceramic with different synthes is m ethods was studied by XRD.It was found t hat the contents of perovskite in cerami c powders synthesized at similar conditi on was different for different methods.B y the traditional method,(PbO+ZnO+Nb 2O 5+TiO 2) ,ceramic powder with lower cont ent of perovskite can be obtained.By the simple precursor method,(PbO+ZN+TiO 2), ceramic powder with higher content than for traditional methods can be obtained. By compostie precursor method,it can obt ain the power with highest content of pe rovskite.The formation of pyrochlore pha se can be controlled well in processes o f precursor methods.The ceramic powder w ith perovskite content higher than 98 pe rcents can be obtain by composite synthe sis methods with little BaTiO 3 as cryst al stabilizer.Such kind of ceramic powde r possesses broad range of sintering tem perature.The curie temperature of Pb[(Zn 1/3 Nb 2/3 ) 0.8 Ti 0.2 ]O 3 cerami c is 190 °C.The ceramic has higher piezo electric property,and the d 33 of th e ceramic decrease with increasing of si ntering temperature.

采用不同固相合成法对钙钛矿型Pb(Zn1/3Nb2/3)0.8Ti0.2陶瓷材料的合成过程进行了研究。XDR结果表明,相同合成条件下,不同合成方法得到的陶瓷粉末钙钛矿含量不同,其中,传统固相合成法(PbO+ ZnO+ Nb2O5+ TiO2)钙钛矿得率最低,简单先驱体合成法(PbO+ ZN+ TiO2)钙钛矿得率较高,复合先驱体合成法(PbO+ ZNT)钙钛矿得率最高。先驱体合成法具有抑制B位复合钙钛矿固相合成过程中焦绿石相形成的作用。采用复合先驱体合成法以少量钛酸钡作为晶型稳定剂采用适当的合成工艺可以得到钙钛矿纯度大于98% Pb[(Zn1/3Nb2/3)0.8Ti0.2]O3 陶瓷粉末。其具有较宽的烧成温度范围,该陶瓷材料的居里温度为190 °C,具有较高的压电常数,且压电常数随烧结温度的提高而降低。用DTA 对各合成方法的配合料进行了研究,发现,差热特征峰峰位与合成过程中焦绿石的出现和钙钛矿的合成温度有很好的对应关系,差热分析可用以对B位复合钙钛矿合成进行动态研究

In order to identify the factors having influences on the thermal stability of the compounds in the VPO system, an ethylenediamine templated vanadium phosphate (H3NCH2CH2NH2)4·3H2O (for short V9P8-4en) with threedimensional openframework was synthesized through hydrothermal reaction of simple precursors V2O5, H3PO4, NH2(CH2)2NH2(en) and H2O at a mole ratio of 055∶69∶36∶265 at 170 ℃ for 5 days using the molecular selfassembly technique, and the relation of compositionstructurethermal...

In order to identify the factors having influences on the thermal stability of the compounds in the VPO system, an ethylenediamine templated vanadium phosphate (H3NCH2CH2NH2)4·3H2O (for short V9P8-4en) with threedimensional openframework was synthesized through hydrothermal reaction of simple precursors V2O5, H3PO4, NH2(CH2)2NH2(en) and H2O at a mole ratio of 055∶69∶36∶265 at 170 ℃ for 5 days using the molecular selfassembly technique, and the relation of compositionstructurethermal stability of the compound is characterized and studied by FT-IR, TG-DTA, XRD, SEM and chemical analysis from the viewpoint of crystal chemistry. The results of researches indicate that the compound remains stable below 350 ℃,and the structure collapse is results from the decomposition and removal of organic templates in the compound, which breaks the hydrogen bonding between en and VPO network and destroys the charge balance in the whole structure. One of the ways to enhance the thermal stability of V9P8-4en is to improve the linkage among structural blocks and to weaken the bonding between template and network of the compound.

为了探讨影响V-P-O体系孔道结构化合物热稳定性的因素,以V2O5、H3PO4作为简单的无机前驱物、乙二胺作模板,利用分子自组装技术,水热法合成了三维孔道结构化合物(H3NCH2CH2NH2)4[VⅢ(H2O)2(VⅣO)8(OH)4(HPO4)4(PO4)4(H2O)2]·3H2O(简称V9P8-4en),并借助化学分析、FT-IR、TG-DTA、XRD及SEM等手段,从晶体化学角度对其进行了系统研究.结果表明:该化合物的热稳定温度为350℃,结构破坏主要是由于有机模板分子与骨架间的氢键破裂,导致结构失去支撑和电荷失衡等原因所致.提出加强骨架自身的稳定性及减弱模板与无机骨架间的键合强度,是可望提高此类化合物热稳定性的主要途径.

The Pauson-Khand-type reaction, the metal-mediated [2+2+1] cycloaddition of alkene, alkyne, and carbon monoxide to generate 2-cyclopentenones, whose use allows the construction of synthetically useful and biologically interesting five-memberd carbocycles in a convergent and atom economic way starting from structurally simple precursors, has received increasing attention over the past two decades. Many efforts have been devoted to realizing Pauson-Khand-type reaction in a more efficient and reliable way....

The Pauson-Khand-type reaction, the metal-mediated [2+2+1] cycloaddition of alkene, alkyne, and carbon monoxide to generate 2-cyclopentenones, whose use allows the construction of synthetically useful and biologically interesting five-memberd carbocycles in a convergent and atom economic way starting from structurally simple precursors, has received increasing attention over the past two decades. Many efforts have been devoted to realizing Pauson-Khand-type reaction in a more efficient and reliable way. The most successful among these approaches is based on the use of transition metals (Rh, Ti, Ru, Ir) other than cobalt. Despite these studies, there are serious limitations in aspects of the catalyst and the reaction species. In the last two years, however, dienes as the substitute of alkynes are used in the transition metal catalyzed Pauson-Khand reaction. The major novelty of this approach can be characterized by the increased reaction rate under easily controlled and mild conditions. This paper deals with the novel discoveries based on studies of Rhodium-catalyzed Pauson-Khand reaction and the application of dienes in Rhodium-catalyzed [2+2+1] cycloaddition. We believe that this development means that we are now entering a new age of catalytic dienyl Pauson-Khand reaction.

 综述了近年来铑催化Pauson_Khand反应的研究新近展.最近两年,双烯作为传统的Pauson_Khand反应中炔的替代物被应用在反应里,以往对Pauson_Khand反应的改进都是从催化剂和添加剂出发,而双烯的应用则从本质上推动了该反应,使人们看到了Pauson_Khand反应的诱人前景.重点讨论了双烯在铑催化Pauson_Khand反应中的应用.

 
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