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enhancement of
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  增强
     STUDY ON RESOLUTION ENHANCEMENT OF FOURIER TRANSFORM SPECTROSCOPY
     Fourier变换光谱分辨率增强技术研究
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     Construction of MUC1 DNA vaccine and enhancement of anticancer immunity with co-delivery of GM-CSF adjuvant
     MUC1基因疫苗的构建及GM-CSF增强其抗肿瘤免疫的实验研究
短句来源
     Study on Enhancement of Gas-Liquid Mass Transfer by Fine Particles in Slurry System
     浆料体系中细颗粒增强气液传质研究
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     In Vitro Study on the Enhancement of Aminopeptidase N/CD13 Inhibitor Ubenimex on the Inducing-differentiation Activity of All-trans-retinoic Acid in Acute Promyelocytic Leukemia Cells and the Mechanism of This Effect
     氨肽酶N/CD13抑制剂乌苯美司增强全反式维甲酸诱导急性早幼粒白血病细胞分化作用及其机制的研究
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     Experimental Studies on the Enhancement of TRAM Flap Survival in the Rat by Recombinant Adenovirus-mediated VEGF_(165) Gene
     重组腺病毒载体介导的VEGF_(165)基因增强大鼠TRAM皮瓣存活的实验研究
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  强化
     Enhancement of mucosal and cellular immune responses of mice with HPV16 L1-E7 DNA priming and HPV16 L1 protein boosting vaccination after nasal vaccination
     滴鼻接种HPV16 L1-E7 DNA初始引发及HPV16 L1 VLP强化免疫可增强小鼠黏膜和细胞免疫
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     ENHANCEMENT OF PULSE TUBE REFRIGERATION WITH He-H_2 MIXTURE AND Er_3NiH_x PACKING
     He-H_2混合工质与Er_3NiH_x填料强化脉管制冷性能
     (3)delayed enhancement of regional bowel in 33 patients(82.5%);
     (3)肠壁局部延迟强化(33,82.5%);
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     Enhancement of Boiling R134a/R142b Refrigerants Mixtures on TubeBundles
     替代工质R134a/R142b管束外沸腾传热强化实验研究
短句来源
     Heat Transfer Enhancement of Boiling Refrigerant Mixtures of R134a/R142b
     混合制冷工质R134a/R142b池核沸腾传热强化研究
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  “enhancement of”译为未确定词的双语例句
     Enhancement of Sensitivity of Bladder Tumor Cells to MMC by Liposome Conjugated C-myc Antisense Oligonucleotides and Expression of C-myc Oncoprotein in Bladder Cancer
     反义c-myc寡核苷酸提高膀胱癌细胞对MMC的敏感性和c-myc癌基因蛋白在膀胱移行细胞癌表达的临床意义
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     Study on Agricultural Mechanization and the Enhancement of Agricultural International Competitiveness in China
     中国农业机械化与提高农业国际竞争力研究
短句来源
     Enhancement of Radiosensitivity in Hep G2 Cells by a Mutant I κ B α Gene Transfection
     mIκBα基因转染肝癌细胞(Hep G2)的辐射增敏作用
短句来源
     Enhancement of Telomerase and NF-Kappa B Activation in Vincristine-resistant Human Gastric Cancer Cells
     端粒酶和核因子-kappa B在胃癌细胞长春新碱耐药中的作用研究
短句来源
     Enhancement of Ganglioside GD1a on Epidermal Growth Factor Induced Signal Transduction
     神经节苷脂GD1a对表皮生长因子诱导的信号转导的增强作用
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  enhancement of
The first result is an enhancement of the Paley-Wiener type constant for nonharmonic series given by Duffin and Schaefer in [6] and used recently in some applications (see [3]).
      
Enhancement of wave and acceleration of electron in plasma in the external field
      
This paper investigates the enhancement of Langmuir and ion-acoustic wave and the acceleration of the electron in collisionless plasma, in the presence of an external transverse field.
      
We observe great enhancement of SHGs in the one-dimensional photonic crystals (PCs) with defects consisting of multiple photonic quantum wells made of nonlinear material when the frequency of fundamental wave aims at one of the defect states.
      
Enhancement of Kerr nonlinearity and its application to entangled state discrimination
      
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Recently, attention has been directed to the effect of chelation upon thephysiological action of certain chemical compounds. A number of investiga-tors, especially Albert and his coworkers have demonstrated the importantrole played by the chelation structure of 8-hydroxyquinoline in producingfungicidal action. Our preliminary tests on p-nitrobenzaldehyde (ⅩⅩⅪ) ascompared with o-hydroxy-p-nitrobenzaldehyde (ⅩⅩⅩ) and on o-methoxy-p-nitroacetophenone (ⅩⅢ) as compared with o-hydroxy-p-nitroacetophenone(Ⅻ) confirmed...

Recently, attention has been directed to the effect of chelation upon thephysiological action of certain chemical compounds. A number of investiga-tors, especially Albert and his coworkers have demonstrated the importantrole played by the chelation structure of 8-hydroxyquinoline in producingfungicidal action. Our preliminary tests on p-nitrobenzaldehyde (ⅩⅩⅪ) ascompared with o-hydroxy-p-nitrobenzaldehyde (ⅩⅩⅩ) and on o-methoxy-p-nitroacetophenone (ⅩⅢ) as compared with o-hydroxy-p-nitroacetophenone(Ⅻ) confirmed this view. The two compounds with chelation structures areinvariably more active than the corresponding compounds where this kindof structure is no more possible (see Table 1). This result encourages us toextend the examination on the so-called dehydrochloramphenicol (Ⅱ), ananalogue of chloramphenicol (Ⅰ) but devoid of the antibiotic activities of thelatter, except those against M. tuberculosis and fungi. Our project is to introduce a hydroxyl group to the position ortho to thecarbon side-chain in (Ⅱ), producing α-dichloroacetamido-β-hydroxy-o-hydroxy-p-nitropropiophenone (Ⅲ), a compound in which chelation will be possible, andto compare its antibiotic activities with those of (Ⅱ) in which there is nochelation. To make sure that any enhancement of activity is not due to substitutionat the ortho position, the hydroxyl group of Ⅲ was methylated so as to makechelation impossible in the resulting compound, α-dichloroacetamido-β-hydroxy-o-methoxy-p-nitropropiophenone (Ⅳ). Furthermore, compounds with simplerstructure, (ⅩⅩ), (ⅩⅪ), (ⅩⅤⅢ), and (ⅩⅩⅨ), in which the hydroxymethylgroup is lacking and consequently does not contain any asymmetric carbonatom, are also examined. In all these cases, compounds able to form chelationring invariably showed higher antibiotic activities than the correspondingcompounds unable to do so (see Table 1). The function of the nitro group in these molecules has also been considered.When this group in (Ⅲ) or (Ⅳ) is changed to an amino group, there is suchmarked decrease of activity in the resulting compounds (Ⅴ) or (Ⅳ) thatneither of them showed any activity below a concentration of 400 γ/ml. As compared with chloramphenicol, compound Ⅲ is almost as effectiveagainst Gram-positive bacteria, especially St. Aureus, but is much less effectiveagainst Gram-positive bacteria. The present authors are of the opinion thatthe mechanisms of antibiotic action of the two compounds must be different. Compound ⅩⅢ was obtained from o-methoxy-p-nitroethylbenzene (Ⅹ) byoxidation with potassium permanganate buffered with manganese nitrate.Compound Ⅹ was in turn prepared from o-amino-p-nitroethylbenzene (Ⅶ)through diazotization, hydrolysis, and methylation with dimethylsulfate.Methylation of Ⅻ also gave ⅩⅢ. As to compound Ⅻ, it was obtained in two ways: (1) Demethylation ofcompound ⅩⅢ with hydrobromic acid or anhydrous aluminum bromide incarbon disulfide, the latter procedure giving better results, (2) oxidation of themethoxymethyl ether (Ⅸ) of compound Ⅷ with potassium permanganate toyield compound Ⅺ followed by hydrolysis with dilute hydrochloric acid. Ourproduct did not depress the melting point of a sample prepared fromm-nitrophenol through Fries rearrangement according to Gerecs et al.Derivatives of Ⅻ have been prepared, they are: the acetate (Ⅻa) and itsα-bromo-derivative (ⅩⅠⅤa), the benzoate (Ⅻb)and its α-bromo-derivative(ⅩⅠⅤb). Compounds Ⅻ and ⅩⅢ were then separately subjected to the five-stepsynthesis recorded in the literature [8, 11--13] for the preparation of dehydrochlo-ramphenicol, namely: (1) bromination to give ⅩⅠⅤ and ⅩⅤ, (2)treatmentwith urotropine to give ⅩⅠⅤ and ⅩⅠⅡ, (3) hydrolysis to give ⅩⅤⅢ and ⅩⅠⅩ,(4) dichloroacetylation to give ⅩⅩ and ⅩⅪ or acetylation to give ⅩⅩⅡ andⅩⅩⅢ, and (5)condensation with formaldehyde in the presence of sodiumhydroxide (for Ⅲ and ⅩⅩⅣ) or sodium bicarbonate (for Ⅳ and ⅩⅩⅤ)(see scheme). When compound ⅩⅩⅤ was subjected to hydrolysis by hydrochloric acid, acompound was obtained, which is believed to be a diketene (ⅩⅩⅥ). When compound ⅩⅩⅢ was treated with acetyl chloride, a compoundC_(11)H_(10)O_4N_2 was obtained. This formula corresponds to 2-methyl-5-(o-methoxy-p-nitrophenyl)-oxazoline (ⅩⅩⅦ). The amino-compounds Ⅴ, Ⅵ, ⅩⅩⅤⅢ and ⅩⅩⅨ were obtained from thecorresponding nitro-compounds by reduction with sodium hydrosulphite.

1.本文叙述自邻氨基-对硝基乙苯开始分别经过九步或八步反应,合成α-二氯乙酰胺基-β-羟基-邻羟基对硝基苯丙酮(Ⅲ)和α-二氯乙酰胺基-β-羟基-邻甲氧基对硝基苯丙酮(Ⅳ),以及一些有关的化合物。 2.硝基化合物Ⅲ及Ⅳ均可以低亚硫酸钠还原成相应的氨基化合物,α-二氯乙酰胺基-β-羟基-邻羟基-对氨基苯丙酮(Ⅴ)和α-二氯乙酰胺基-β-羟基-邻甲氧基-对氨基苯丙酮(Ⅵ)。 3.曾试验邻羟基-对硝基苯甲醛与对硝基苯甲醛,及邻羟基-对硝基苯乙酮与邻甲氧基对硝基苯乙酮等两对化合物的抗菌效力。结果凡有氢键钳合结构的化合物均有较强的抗菌作用。 4.曾试验化合物Ⅲ,Ⅳ,Ⅴ,Ⅵ及其相应的去羟甲基化合物ⅩⅩ,ⅩⅪ,ⅩⅩⅧ和ⅩⅩⅨ对金色葡萄球菌,枯草杆菌,大肠杆菌和副伤寒菌B型的抑制作用。在此等化合物中(除去Ⅴ),凡有酚基与羰基形成钳合结构的化合物均有比较强的抗菌作用。化合物Ⅲ对金色葡萄球菌的抑制效力接近于氯霉素,但对革兰氏阴性菌的效力低于氯霉素;这种不一致的现象可能是Ⅲ的抗菌作用机理与氯霉素不同。

The branching ratio R+=W(K~+→2π)/W(K~0→2π)is estimated from the late experimental data of R_0=W(K_1~0→2π~0)/W(K_1~0→2π)and the knowledge of π-π interactions. It is shown that if there is a resonance in the I=0 of the two points then the enhancement of the R_+ can be well explained.

利用目前K_(2π)衰变分枝比R_0=W(K_1~0→π~0+π~0)/W(K_1~0→π~0+π~0)+W(K_1~0→π~++π~-)的实验数据和π-π作用方面的有关知識,估計了衰变分枝比R_+=W(K~+→π~++π~0)/W(K_1~0→π~0+π~0)+W(K_1~0→π~++π~-);结果表明,如果存在一个I=o S波π-π共振,則能很好地解釋R_+的增加。

Using BCS wave functions and projective wave functions, the relative values of α—reduced width, |M|~2, for _(84)Po even-even isotopes and _(85)At odd-even isotopes have been calculated. A simple method has beem used to calculate the transition matrix elements with projective wave functions. The |M|~2 values given by the projective wave functions are gleater than those of the BCS wave functions by a factor from 2.5 to 6, and greater than those of the single particle model by one order of magnitude. Hence, the...

Using BCS wave functions and projective wave functions, the relative values of α—reduced width, |M|~2, for _(84)Po even-even isotopes and _(85)At odd-even isotopes have been calculated. A simple method has beem used to calculate the transition matrix elements with projective wave functions. The |M|~2 values given by the projective wave functions are gleater than those of the BCS wave functions by a factor from 2.5 to 6, and greater than those of the single particle model by one order of magnitude. Hence, the enhancement of α—decay probabilities due to the pair correlation is amount to an order. In compare with experimental data, the numerical values of α—reduced width and their variation vensus mass number A are better described by projective wave function than by BCS wave function or by single particle model.

利用BCS波函数和投影波函数计算了_(84)Po偶-偶同位素及_(8)At奇—偶同位素基态的α约化宽度的相对值|M|~2。对於投影波函数的跃迁矩阵元的计算给出了一个简便的方法。用投影波函数计算得的|M|~2值比用BCS波函数的大2.5-6倍,比单粒子模型给出的值大一个数量极,因此对关联可以使α衰变几率增加一个数量级左右。用了投影波函数后,α约化宽度随质量数A变化的相对趋势与实验值符合的程度也比用BCS波函数和单粒子模型的结果有改进。

 
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