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precursor     
相关语句
  前体
    MOCC Precursor Method: Design and Synthesis of Fluorescent Metal-Organic Coordination Polymers
    MOCC前体法:荧光金属—有机配位聚合物的设计与合成
短句来源
    Synthesis of the Precursor of Acyloin Derivatives of Ferrocene——2-Ferrocenyl-2-(Aryl Hydroxymethyl)-1,3-Dithiane
    二茂铁偶姻衍生物前体——2-二茂铁基-2-(芳基羟甲基)-1,3-二噻烷的合成
短句来源
    Studies on Macrocyclic Diterpenoids(Ⅱ) ——Synthesis of the Precursor Compound of (±)-Cembrene-A
    大环二萜类化合物研究(Ⅱ)——(±)-Cembrene-A前体化合物的合成
短句来源
    Studies on Macrocyclic Diterpenoids(Ⅳ)——Synthesis of Isosarcophytol-A Precursor
    大环二萜类化合物的研究(Ⅳ)——Isosarcophytol—A前体化合物的合成
短句来源
    By studying the reaction,the optimal reaction conditions are reaction temperature with 160 ℃,reaction time with 4 h and the ratio of methidium's precursor and DMS with 1 to 5.Under such conditions,the product with purity of(92.3%) could be obtained.
    通过HPLC检测的方法对反应中反应产物的检测,研究表明在反应温度为160℃,反应时间为4 h,甲锭前体与硫酸二甲酯摩尔比为1∶5的条件下,甲锭前体的收率为96.1%,目标产物的纯度可达到92.3%。
短句来源
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  前驱体
    ADSORPTION AND MODIFICATION OF MACROMOLECULAR PEG ON THE ZrO_2 PRECURSOR
    PEG在ZrO_2前驱体表面的吸附及改性作用
短句来源
    A modified cathode material of LiNi1/3Co1/3Mn1/3O2 with the layered structure was prepared by composite doping with F and Si ions under oxygen atmosphere using (Ni1/3Co1/3Mn1/3)(OH)2 as the precursor obtained by co-precipitation method.
    以共沉淀法合成的(Ni1/3Co1/3Mn1/3)(OH)2为前驱体,在氧气氛中合成了层状正极材料LiNi1/3Co1/3Mn1/3O2,用F、Si离子复合掺杂的方法对其进行改性。
短句来源
    The vinyl silazane (VL20) is a kind of liquid ceramic precursor.
    乙烯基硅氮烷(VL20)是一种液态陶瓷前驱体,在光引发剂存在下与巯基化合物快速发生光聚合反应。
短句来源
    Results show that the alumina powder,which was obtained by calcining NH4Al(OH)2CO3 precursor at 1100℃ for 2 hours,had the average particle size of 20 nm,and had no obvious hard agglomeration.
    结果表明,NH4Al(OH)2CO3前驱体经1 100℃煅烧2 h得到的Al2O3粉体性能较好,平均粒径仅为20 nm,粒度均匀,基本没有硬团聚。
短句来源
    Nanocrystalline precursor powders including BaTi_5O_(11) and Ba_4Ti_(13)O_(30) of 30~50 nm were prepared by heat-treating xerogel at 750 ℃.
    干凝胶在750℃热处理得到了物相为BaTi_5O_(11)和Ba_4Ti1_3O_(30)、尺寸为30 ̄50nm的前驱体粉体。
短句来源
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  先驱体
    Preparation and Characterization of Polycarbosilane Precursor for SiC Fiber with Low Specific Resistance
    低电阻率SiC纤维先驱体聚碳硅烷的制备与表征
短句来源
    SYNTHESIS AND CHARACTERIZATION OF PRECURSOR POLYALUMINOCARBOSILANE TO SiC(Al) CERAMIC FIBERS
    SiC(Al)陶瓷纤维先驱体聚铝碳硅烷的合成与表征
短句来源
    Carbon content of PC-P precursor is higher than that of PCS synthesized from PDMS, while silicon content of PC-P is lower than that of PCS.
    PC—P含有Si、C、H、O元素,其C含量高于由PDMS制备的先驱体PCS,而Si含量低于PCS;
短句来源
    The precursor Polyaluminocarbosilane (PACS) to SiC(Al) ceramic fibers was synthesized by the reaction of Aluminum acetylacetonate (Al(AcAc)_3) with polysilacarbosilane (PSCS), which was prepared by the thermolysis and condensation of polydimethylsilane (PDMS).
    利用聚二甲基硅烷(PDMS)热解聚合的液相产物聚硅碳硅烷(PSCS)与乙酰丙酮铝(Al(AcAc)3)反应制备了SiC(Al)陶瓷纤维的先驱体聚铝碳硅烷(PACS)。
短句来源
    precursor for BCN compound C_3N_6H_6(H_3BO_3)_2 was synthesized with C_3N_6H_6 and H_3BO_3 as raw materials in aqueous solution.
    以三聚氰胺和硼酸为原料在水溶液中反应合成出了一种新的BCN化合物先驱体C3N6H6(H3BO3)2。
短句来源
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  前驱物
    When the ZnO mixed with SnCl2·2H2O were used as precursor,many different shapes of Sn doped ZnO crystals were obtained. And the rate of growth along c-axic was weakened apparently,so the positive polar face c{0001} can expose more area. And also exposed negative polar-c{0001},positive pyramidal face p{1010},negative pyramidal face-p{101 1} and hexagonal face m{1010}.
    当前驱物中添加SnCl2.2H2O可以明显影响部分晶体形态,使正极面c轴方向的生长速度受到抑制,较大面积显露正极面c{0001},同时也显露负极面-c{000 1}、正锥面p{10 10}、负锥面-p{101 1}和柱面m{10 10}。
短句来源
    A mixed oxalate precursor of ZnFe2O4 was prepared from Fe(NO3)3·9H2O, Zn(NO3)2·6H2O and H2C2O4·2H2O by solid-state reaction at room temperature. According to Hass low, a circulating system of the chemical reactions was designed to determine the ΔH values of reactants and resultants in the reaction.
    采用Fe(NO3)3·9H2O、Zn(NO3)2·6H2O和H2C2O4·2H2O,以室温固相法制备出ZnFe2O4的混合前驱物
短句来源
    The enthalpy of the solid state reaction to prepare the precursor of ZnFe2O4 was calculated to be 406.21 kJ/mol, indicating that the reaction is endothermic.
    计算了硝酸铁、硝酸锌和草酸固相反应焓变:ΔHr=406.21kJ/mol,获得了固相反应制备ZnFe2O4的混合前驱物相关热化学参数,证明了该反应是吸热反应。
短句来源
    According to the character of VO2 taking phase transition at near 68 ℃,using the mixture gas of high pure hydrogen and high pure nitrogen as precursor,VO2-xNy thin films are synthesized at low temperature by microwave plasma enhanced procesesses using V2O5 as molecular precursors through coating film on glass slice.
    选用V2O5为前驱物,通过在玻璃片上镀膜,利用高纯氢和高纯氮作为气源,采用微波等离子体增强法,在低温条件下合成了氮杂二氧化钒(VO2-xNy)样品。
短句来源
    Sn-doped TiO2 film has been successfully grown on glass substrate by hydrothermal technique with Ti(SO4)2 carbamide and SnCl4 as precursor,precipitate and dopant, respectively.
    以Ti(SO4)2为前驱物,尿素为沉淀剂,SnCl4为掺杂剂,采用水热法制备出Sn-TiO2薄膜。
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  precursor
The overall process involves three steps: preparation of insoluble carboxyl-containing grafted starch copolymer (ISC), formation of precursor (ISC-Co), decomposition of ISC-Co, and phase transition of Co3O4 nanoparticles.
      
The precursor was proved to be [Zn5(OH)6(CO3)2] by TG-DTG-DTA and IR analysis.
      
This precursor was calcined at 300°C for 1, 2 and 3 hours respectively, and then the nanocrystalline ZnO of different grain size were obtained.
      
Steam produced during the decomposition process accelerated the sintering of MgO, and MgO with surface area as high as 412 m2 · g-1 was obtained through calcining its precursor in flowing dry nitrogen at 520°C for 4 h.
      
ZrWMoO8 powders with different morphologies were obtained using ammonium tungstate, molybdate tungstate and zirconium tungstate as the starting materials by dehydrating the precursor ZrWMoO7(OH)2(H2O)2.
      
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Highly active supported Ziegler-Natta catalyst for olefin polymerization has been prepared by a modification of known method. MgCl2 was treated consecutively with n-C4H9OH, SiCl4 and TiCl4. The intermediate product in each step of the catalyst preparation has been characterized by means of IR spectra. The observed changes in characteristic IR absorption bands of Si- O bond (1065cm-1, str.), Ti- O bond (1058cm-1, str.; 625cm-1, bending) and C- O bond (1036cm-1, and 1033 cm-1 str.) in the Si- O- C and Ti- O-C...

Highly active supported Ziegler-Natta catalyst for olefin polymerization has been prepared by a modification of known method. MgCl2 was treated consecutively with n-C4H9OH, SiCl4 and TiCl4. The intermediate product in each step of the catalyst preparation has been characterized by means of IR spectra. The observed changes in characteristic IR absorption bands of Si- O bond (1065cm-1, str.), Ti- O bond (1058cm-1, str.; 625cm-1, bending) and C- O bond (1036cm-1, and 1033 cm-1 str.) in the Si- O- C and Ti- O-C groups, as well as of Si- Cl bond (609 cm-1 and 593cm-1, asym.str.), and Ti- Cl bond (499cm-1 and 478cm-1, asym str.), show that there are Ti- O- C groups in catalyst precursor (before mixing with AlR3) Details of designation of the above-mentioned bond have been given. The changes in IR spectra of the samples from consecutive steps of catalyst preparation can be explained by the following reactions,The active component TiCl4 might be bound to the MgCl2 support via an oxygen bridge, or Cl bridge. So, catalyst precursor may be denoted as

本文用红外(IR)光谱研究MgCl_2—C_4H_9OH—SiCl_4—TiCl_4体系聚烯烃高效催化剂,记录了催化剂制备各阶段的液相产物、固相产物及固相产物的汽油悬浮液的IR光谱。我们指定1065cm~(-1)、1036cm~(-1)和609、593cm~(-1)双峰相应为结合在MgCl_2上的C_4H_9OSiCl_3的υ_(Si-O)、υ_(C-O)和υ_(as)(S_1-Cl)吸收带;1058cm~(-1)、1033cm~(-1)、625cm~(-1)以及499、478cm~(-1)双峰相应为结合在MgCl_2上的C_4H_9OTiCl_3的υ_(Ti-O)、υ_(C-O)、δ_(Ti-O)以及υ_(as)(Ti-Cl)吸收带。实验结果支持了我们以前提出的关于这种催化剂体系的化学负载机理和活性中心性质的设想。

In order to observe and identify the intermediates and the change of the catalyst under reaction conditions, we have designed and assembled a high temperature and high pressure infrared spectrophotometer cell. The cell, constructed from stainless steel with NaCl or CaF3 windows, can withstanb 100 atm, and 200℃ The measurement system consists of autoclave, circulating pump and spectrophotometer cell. The infrared spectra are recorded using a Microlab-600 infrared spectrophotometer. The temperature and pressure...

In order to observe and identify the intermediates and the change of the catalyst under reaction conditions, we have designed and assembled a high temperature and high pressure infrared spectrophotometer cell. The cell, constructed from stainless steel with NaCl or CaF3 windows, can withstanb 100 atm, and 200℃ The measurement system consists of autoclave, circulating pump and spectrophotometer cell. The infrared spectra are recorded using a Microlab-600 infrared spectrophotometer. The temperature and pressure in the cell are the same as that in the autoclave, so that it can be used in ''in situ" tracing the behaviour of liquid, gase and liguid-gas mixtures.For the hydroformylation reaction of proplene with rhodium-phosphine complex catalyst, the transition of catalyst precursor Rh(acac) (CO) (PPh3) to active species RhH(CO)2(PPh3)3 has been recorded under the industrial reaction conditions (t =100℃, p=17atm. butyl aldehyde as solvent). If the pressure of synthetic gas is rather low, only RhH(CO) (PPh3) 3 can be identified. The active species RhH(CO)2(PPh3)2 disappears while the catalyst loses its reactivity. The oxidation of the ligand PPh3 and the formation of OPPh3 have been characterized under the oxygen atmosphere. In this case, the deactivation of catalysts, the formation of catalyst dimer, oxidation of proplene to acetone and the dynamics of CO oxidation to form CO2 have been traced.In this paper, the experimental method concerning the ''in situ" infrared tracing technique, high temperature and high pressure I. R spectrophotometer cell have been described and some experimental data and results have been given.

为了观察和监测反应条件下中间产物和催化剂的变化,自行设计并安装了高温高压红外流动池。池体用不锈钢制成,窗口材料为NaCl或CaF_2。它可承受100atm和200℃。整个测量系统包括高压釜、循环泵、红外池等。用Microlab-600型红外分光光度计记录图谱。池内温度和压力与反应釜桐同,可对反应液体、气体或气液混合物进行“原位”追踪。 当用铑膦络合物催化剂进行丙烯氢甲酰化反应时,在近于工业反应条件下(t=10O℃,P=17atm,正丁醛溶剂),检测到催化剂母体Rh(acac)(CO)(PPh_3)转化为活性物种RhH(CO)_2(PPh_3)_2;在合成气压力较低时,只转化为RhH(CO)(PPh_3)_3;此活性物种随催化剂失活而消失。催化剂加氧失活后,检测到配位体三苯基膦氧化为氧化三苯基膦,催化剂生成二聚物,丙烯氧化成丙酮,追踪到原料气CO氧化为CO_3的动态过程。 本文对“原位”红外光谱实验方法、高温高压红外池作了介绍,并给出有关实验数据和结果。

Jowict's procedure of synthesizing the complex MoO[S2P(OEt)2]2 has been improved, and two new methods have been found. The new adduct .MoO[S2P-(OEt)2]2(EtO2CN = NCO2Et) and five new adducts MoO(S2CNEt2)2·(Ac) (Ac = CH≡CCH2OH, CH≡CCH2OEt, CH≡CCH2Cl, CH≡CCH2Br, HOCH2C≡CC_ H2OH) have been synthesized.It has been found that it is the Mo(Ⅳ) complexes that combine with alkynes, and that the greater the capability of sulfur-containing .ligands to supply electrons, the easier will be the Mo(Ⅳ) complexes to combine with...

Jowict's procedure of synthesizing the complex MoO[S2P(OEt)2]2 has been improved, and two new methods have been found. The new adduct .MoO[S2P-(OEt)2]2(EtO2CN = NCO2Et) and five new adducts MoO(S2CNEt2)2·(Ac) (Ac = CH≡CCH2OH, CH≡CCH2OEt, CH≡CCH2Cl, CH≡CCH2Br, HOCH2C≡CC_ H2OH) have been synthesized.It has been found that it is the Mo(Ⅳ) complexes that combine with alkynes, and that the greater the capability of sulfur-containing .ligands to supply electrons, the easier will be the Mo(Ⅳ) complexes to combine with and activate C-C triple bond.According to the rule mentioned above, we deem that the probable suggested by Hodgson etal. on the basis of EXAFS, is reasonable. Recently, Prof. Lu Jiaxi et al. have proposed the probable precursors of FeMo-co, i. e. compounds of G-series. Among these compounds, we believe KB ([MoFeS2(SH)2Cl2]2-) may be the real active species.

本文改进了Jownt合成MoO[S_2P(OEt)_2]_2的方法,还发现了两个新的合成方法。合成了新加合物MoO(S_2CNEt_2)_2·(Ac)(Ac=CH≡CCH_2OH,CH≡CCH_2OEt,CH≡CCH_2C1,CH≡CCH_2Br,HOCH_2C≡CCH_2OH)和MoO[S_2P(OEt)_2]_2·(EtO_2CN=NCO_2Et)。研究了Mo_2O_3[S_2P(OEt)_2]_4·、MoO(S_2P(OEt)_2)_2、Mo_2O_3(S_2CNEt_2)_4、MoO(S_2CNEt_2)_2,Mo_2O_3(S_2COEt)_4(以下分别简写为P(5)、P(4)、N(5)、N(4),O(5))络合和活化炔类化合物的性能,并发现与炔键络合的是Mo(Ⅳ)络合物,且含硫配位体的供电子能力愈强,Mo(Ⅳ)络合物络合和活化炔键的能力亦愈强。

 
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