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chemical methods     
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  化学方法
     The structure of the new triterpenoid saponin was elucidated as 3_O_ α_L_arabinopyranosyl_urs_9(11),12_dien_28_oic acid β_D_glucopyranosyl ester mainly by using 1D, 2D_NMR techniques and chemical methods.
     )的根中分离得到 6个三萜皂甙 ( 1~ 6 ) ,其中化合物 3为一新的三萜皂甙 ,命名为unifloroside,其结构经 1D ,2D_NMR及化学方法鉴定为 3_O_α_L_arabinopyranosyl_urs_9( 11) ,12_dien_2 8_oicacidβ_D_glucopyranosylester。
短句来源
     Methods They were identified by (()~1H-NMR), (()~(13)C-NMR), FAB-MS, CD, 2-dimensional (()~1H-()~1HCOSY) spectra, and chemical methods.
     方法 利用 1 H- NMR,1 3C- NMR,FAB- MS,CD谱及 1 H- 1 HCOSY二维谱与化学方法鉴定。
短句来源
     The chemical structure was determined by 1HNMR, 13CNMR,FABMS,DEPT, 1H-1HCOSY spectra and chemical methods.
     测定其化学结构通过解析其1HNMR、13CNMR、FABMS、DEPT谱及1H-1HCOSY二维谱与化学方法
短句来源
     The structures of przewaquinone A (C_(19) H_(18) O_4, mp 173-5℃) and przewaquinone B (C_(18) H_(12) O_4, mp 242-3℃)were elucidated as (Ⅰ) and (Ⅱ_b) by spectral analyses and chemical methods, respectively.
     中分离到两种新的二萜醌类化合物,取名为紫丹参甲素(C_(19)H_(18)O_4,熔点173~5℃)和紫丹参乙素(C_(14)H_(12)O(4),熔点242~3℃),经物理和化学方法的研究推定其结构式分别为(Ⅰ)和(Ⅱb)。
短句来源
     On the basis of spectroscopic (UV, ~1HNMR, ~(13)CNMR, EI-MS, FAB-MS) analysis, chemical methods and acidic hydrolytic products, their structures were identified as follows, kaempferol (Ⅰ), quercetin (Ⅱ), trifolin (Ⅲ), hyperin (Ⅳ), isoquerci- trin (Ⅴ), kaempferol 3-0-α-L-rhamnosyl- (1→6)-β-D-glucoside (Ⅵ).
     根据光谱分析(UV,~1HNMR,~(13)CNMR,EI-MS,FAB-MS)、化学方法及水解产物,它们的结构被确定为:山奈酚(Ⅰ),槲皮素(Ⅱ),三叶豆甙(Ⅲ),金丝桃甙(Ⅳ),异槲皮甙(Ⅴ),山奈酚-3-0-α-L-鼠李糖基-(1→6)-β-D-葡萄糖甙(Ⅵ)。
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  化学法
     Layered structure LiNi_(1-x)Co_xO_2 positive materials and LiNio LiNi_(0.7)Co_(0.3-x)M_xO_2 (M=A1, Mn) materials of lithium ion secondary batteries were prepared by solid phase mixing reaction and liquid phase chemical methods in this paper.
     本论文采用固相混合和液相化学法在高温热处理下制备了锂离子二次电池用的具有层状结构的LiNi_(1-x)Co_xO_2正极材料及LiNi_(0.7)Co_(0.3-x)M_xO_2(M=Al,Mn)材料;
短句来源
     Results In testing the patient's urine AMY,there was better correlativity between the dry and wet chemical methods,r=0.993.The expected relative bias between two methods was 15.8% at 180 U/L 6.6% at 490 U/L and 3.7% at 980 U/L for urine AMY.
     偏倚估计时样本尿淀粉酶活力为 180U/L、 4 90U/L和 980U/L ,干化学法和湿化学法测定结果的预期相对偏倚分别为 15 8%6 6 %和 3 7%。
短句来源
     Methods The MDA,SOD and TAOC were determined and the value of TAOC/MDA was measured in 60 cases of senile cases and 30 young cases by thiobarbiturates,autoxidation of pyrogallol and Fe 3+/Fe 2+ chemical methods.
     方法  分别用硫代巴比妥法、邻苯三酚自氧化法和Fe3 + /Fe2 + 化学法对 60例老年人及 30例青年人血中MDA、SOD、TAOC进行测定并计算TAOC/MDA比值。
短句来源
     Results obtained by this method were in good accordance with those values deter mined by chemical methods. Relative standard deviations(n=10) for each component were in the range of 0.15%-3.79%.
     该方法与化学法测定结果符合较好,10次制样测量各组分,相对标准偏差在0.15%~3.79%范围内。
短句来源
     Methods A unkown sample in a case was analyzed with FTIR、SEM/EDX、GC/MS and chemical methods.
     方法综合运用傅立叶红外光谱仪(FTIR)、扫描电镜/能谱仪(SEM/EDX)、气质联用仪(GC/MS)、化学法分析等方法。
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  化学知识
     Chemical Methods and Chemical Knowledge in Ancient Chinese Alchemy By Agueous Methods
     中国古代水法炼丹中的化学方法和化学知识
短句来源
  化学手段
     Methods The compounds were separated by means of solvent extraction, chromatography on absorbent resin SP825 and silica gel C_ 18 repeatedly, and their structures were elucidated on the basis of chemical methods and spectral analyses (FAB-MS,~ 1H NMR,~ 13 C NMR,~ 1H-~1H COSY).
     方法采用水煎提取、大孔吸附树脂SP825柱色谱、反相C18柱色谱等进行分离,并通过化学手段和光谱分析(FAB-MS,1HNMR,13CNMR,1H-1HCOSY)鉴定其化学结构。
短句来源
     Their structures and some of the stereochemistry were elucidated by means of various modern spectroscopic techniques and chemical methods.
     运用多种现代波谱技术结合化学手段,确定了它们的化学结构和部分立体构型。
短句来源
     In the presence of ultrasonically dispersed potassium or his-quaternary ammonium salts, 2, 5-piperazinedione condenses with α,β-unsaturated aldenhydes. The stereochemistry of the pmducts. was confirmed and 1H chemical shifts of the products were assigned by sorts of spectroscopic and chemical methods.
     综合运用了多种波谱学方法及化学手段确证并归属了2,5-哌嗪二酮与α,β-不饱和醛在超声波分散金属钾及双季铵盐作用下反应产物的立体化学与核磁共振信号,为研究这个反应提供了有用的信息.
短句来源
     This paper discussed biological and physical methods instead of chemical methods in the current research at home and abroad,and how to control stored grain diseases and insects in safe storage conditions.
     本文探讨了目前国内外研究开发的代替化学手段的生物、物理方法以及如何结合安全的储藏条件控制储藏中的病虫害。
短句来源
     Now new cell fusion methods are resorting to the combined usage of physical and chemical methods to develop a simple and convenient,easy quantification and at the same time can increase the fusion rate.
     现在新的细胞融合方法正在尝试将各种物理、化学手段综合应用,使细胞融合的方法和手段向操作更为简便,便于量化研究,同时又能使融合率得到不断提高的方向发展。
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  chemical methods
Based on strengthening cultivation and management, integrated control measures were put forward including physical, biologic and chemical methods.
      
This method is less laborious, more rapid, and ecologically cleaner than contemporary chemical methods.
      
myxofaciens (4), and their structures were elucidated using NMR spectroscopy and chemical methods.
      
Unsubstituted 1,3-poly(glycerol phosphate) and two sugar-1-phosphate polymers were identified in the cell wall of Brevibacterium linens VKM Ac-2159 by NMR spectroscopy and chemical methods.
      
A Study of Complexes of Organophosphorus Compounds with BF3 by IR Spectroscopy and Quantum-Chemical Methods: The Conformational
      
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General formulas for the. critical temperature and the discontinuity of the ipecific heat of a, superlattice are obtained by the generalized quasi-chemical method, The results may be applied to any approximation.

本文应用推广准化学方法求得二元超格结晶在任何几近计算中之临界温度及比热突变公式。

The generalization of the quasi-chemical method of Fowler and Guggenheim in the statistical theory of superlattices made by one of the authors is extended to a binary alloy of any composition. The formulae are very similar to those for the composition 1:1. The alloy AuCu3 is treated in more detail.

本文推广准化学方法二元合金超格学说中之应用於合金之任何组成成分,所得式与组成在一比一时者极相似。最後对於AuCu_3之合金有较详之讨论。

The chemical method of organic qualitive analysis is rather time consuming. This paper presents a simple method of identification, utilizing the data obtained chiefly from a few physical measurements. The method is also suitable for identifying new compounds and compounds whose derivation is unknown.Physical properties, such as density, refractive index, boiling point and viscosity are related to the molecular weight and to the chemical constitution of a molecule. The system presented,...

The chemical method of organic qualitive analysis is rather time consuming. This paper presents a simple method of identification, utilizing the data obtained chiefly from a few physical measurements. The method is also suitable for identifying new compounds and compounds whose derivation is unknown.Physical properties, such as density, refractive index, boiling point and viscosity are related to the molecular weight and to the chemical constitution of a molecule. The system presented, based on these correlations, enables one to tell the kind as well as the number of functional groups, to detect the presence and the nature of a ring be it saturated or unsaturated, cyclic or heterocyclic, and to construct the empirical formula of the compound. With the empirical formula, and the kind and number of functional groups established, it is possible by the use of references, such as Beilstein and Chemical Abstracts, to list the physical properties of all possible known isomers. Often the detail structure of nknown can be reasonably ascertained by comparing the physical properties of the unknown with those of the known compounds.The method presented covers liquid substances containing carbon, hydrogen and oxygen only, but the same principle is applicable to those compounds containing sulfur, nitrogen, phosphorus and halogens.

本文提出一有机定性分析的简单方法,主要是根据几种物理常数。这法亦适用于鉴定新的或不知来源的化合物。物理性质,如密度、折射率、沸点及粘度,与分子量及化学结构有关。根据此关系可测定官能团的种类及数目;检验有无环;并求得化合物的实验式。知道实验式及官能团的种类、数目后,可从参考书中查出所有可能异构体的物理性质。比较未知物与已知物的物理性质后,通常即能推定未知物的结构式。本文所述方法只可用于含碳、氢及氧的液态化合物,但同样原理应可用于含硫、氮、磷及卤素的化合物。

 
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