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效应
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    INHIBITING PROPERTIES OF 2,2,6,6-TETRAMETHYL-4-OXO-PIPERIDINE-1-OXYL AND ITS SYNERGISTIC ACTION WITH QUINONES
    2,2,6,6-四甲基-4-氧-哌啶氮氧自由基的阻聚及其同醌类化合物的协同效应
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    QUANTITATIVE RELATIONSHIP BETWEEN EXALTATION OF MOLECULAR REFRACTION AND CHEMICAL REACTIVITY Ⅰ. A CONJUGATIVE INDEX σE
    超加折射度与结构活性的定量关系 Ⅰ.共轭效应参数σ_E
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    RESEARCH ON 2,5-DISUBSTITUTED OXAZOLE(Ⅱ)
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    SYNERGISM OF 2,2,6,6-TETRAMETHYL-4-HYDROXY PIPERI- DINE AND 2,2,6,6-TETRAMETHYL-4-HYDROXY-PIPERIDINE- N-OXYL WITH 2-HYDROXY-4-OCTYLOXY-BENZOPHENONE (UV-531) IN PHOTO-STABLIZATION OF POLYPROPYLENE FILMS
    2,2,6,6-四甲基哌啶醇和2-羟基-4-辛氧基二苯甲酮对聚丙烯膜光稳定作用的协同效应
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p-Nitrobromobenzene was prepared from the sodium salt of α-p-Nitrophe-nyl-β-acetyl-hydrazine by bromination and subsequent addition of copper catalyst.Similary,α-p-nitrophenyl-pyridine was obtained by adding pyridine instead ofcopper catalyst.

(一)α-对硝基苯-β-乙醯肼钠盐溴化后,加进铜催化剂,即有放氮效应,产品为对硝基溴苯。(二)用吡啶代替铜催化剂,亦放出氮气,产品为α-对硝基苯吡啶.

By means of Friedel-Crafts reaction, the following compounds were prepared from 4-methyl- imidazolone-2 and four different ω-carbethoxy acyl halides: 4-methyl-5-(δ-carbethoxy-γ-methyl- butyryl)-imidazolone-2, 4-methyl-5-(δ-carbethoxy-γ, γ-dimethylbutyryl)-imidazolone-2, 4-methyl- 5-(ω-carbethoxy-n-nonanoyl)-imidflzolone-2, and 4-methyl-5-(ω-carbethoxy-n-heptadecanoyl)- imidazolone-2. With PtO_2 as catalyst, they were readily reduced to the four corresponding imidazolidone compounds. These compounds were hydrolyzed...

By means of Friedel-Crafts reaction, the following compounds were prepared from 4-methyl- imidazolone-2 and four different ω-carbethoxy acyl halides: 4-methyl-5-(δ-carbethoxy-γ-methyl- butyryl)-imidazolone-2, 4-methyl-5-(δ-carbethoxy-γ, γ-dimethylbutyryl)-imidazolone-2, 4-methyl- 5-(ω-carbethoxy-n-nonanoyl)-imidflzolone-2, and 4-methyl-5-(ω-carbethoxy-n-heptadecanoyl)- imidazolone-2. With PtO_2 as catalyst, they were readily reduced to the four corresponding imidazolidone compounds. These compounds were hydrolyzed with 1 N NaOH and then followed by acidification to give the following acids: 4-methyl-5-(δ-carboxy-y-methylbutyl)- imidazolidone-2, 4-methyl-5-(δ-carboxy-γ, γ-dimethylbutyl)-imidazolidone-2, 4-methyl-5-(ω-car-boxy-n-nonanyl)- imidazolidone-2, and 4-methyl-5-(ω-carboxy-n-heptadecanyl)-imidazolidone-2. Microbiological tests indicated that the first three acids are good anti-biotins towards lactobacillus casei and saccharomyces cerevisiae strain No. 139. Due to its extreme insolubility in water, the last compound has not yet been tested for its microbiological activity.

(1)利用Friedel-Crafts反應,由4-甲基-2-氧代-二氫化咪唑及四個不同的醯氯羧酸酯,得到下列四個化合物:4-甲基-5-(δ-乙氧羰基-γ-甲基丁醯)-2-氧代-二氫化咪唑,4-甲基-5-(δ-乙氧羰基-γ,γ-二甲基丁醯)-2-氧代-二氫化咪唑,4-甲基-5-(ω-乙氧羰基-正壬醯)-2-氧代-二氫化咪唑及4-甲基-5-(ω-乙氧羰基-正十七醯)-2-氧代-二氫化咪唑。 (2)用Cr_(2)O_3精製過的乙酸爲溶劑,PtO_2爲觸媒,這四個4-甲基-2-氧代-二氫化咪唑的衍生物,很順利的吸收相當於3分子的氫,還原為相對應的4-甲基-2-氧代-四氫化咪唑的衍生物,水解後得到下列四個酸:4-甲基-5-(δ-羧基-γ-甲基丁基)-2-氧代-四氫化咪唑,4-甲基-5-(δ-羧基-γ,γ-二甲基丁基)-2-氧代-四氫化咪唑,4-甲基-5-(ω-羧基-正壬基)-2-氧代-四氫化咪唑及4-甲基-5-(ω-羧基-正十七基)-2-氧代-四氫化咪唑。前三者已作過初步的微生物效應試驗,對於lactobacillus casei及saccharomyces cerevisiae都有顯著的反促生素效應。第四個化合物因為...

(1)利用Friedel-Crafts反應,由4-甲基-2-氧代-二氫化咪唑及四個不同的醯氯羧酸酯,得到下列四個化合物:4-甲基-5-(δ-乙氧羰基-γ-甲基丁醯)-2-氧代-二氫化咪唑,4-甲基-5-(δ-乙氧羰基-γ,γ-二甲基丁醯)-2-氧代-二氫化咪唑,4-甲基-5-(ω-乙氧羰基-正壬醯)-2-氧代-二氫化咪唑及4-甲基-5-(ω-乙氧羰基-正十七醯)-2-氧代-二氫化咪唑。 (2)用Cr_(2)O_3精製過的乙酸爲溶劑,PtO_2爲觸媒,這四個4-甲基-2-氧代-二氫化咪唑的衍生物,很順利的吸收相當於3分子的氫,還原為相對應的4-甲基-2-氧代-四氫化咪唑的衍生物,水解後得到下列四個酸:4-甲基-5-(δ-羧基-γ-甲基丁基)-2-氧代-四氫化咪唑,4-甲基-5-(δ-羧基-γ,γ-二甲基丁基)-2-氧代-四氫化咪唑,4-甲基-5-(ω-羧基-正壬基)-2-氧代-四氫化咪唑及4-甲基-5-(ω-羧基-正十七基)-2-氧代-四氫化咪唑。前三者已作過初步的微生物效應試驗,對於lactobacillus casei及saccharomyces cerevisiae都有顯著的反促生素效應。第四個化合物因為在水中溶度太低,故尚未能作它的微生物效應試驗。

High-frequency titration curves are discussed for various methods of experimental determination (the Q-meter, Z-meter and F-meter methods), using equivalent circuits for C-type and L-type titrating cells. It has been found that for the cases of L-type cell with Q-determination and C-type cell with Z- or F-determination, the quantity measured in the course of titration changes monotonously with .the increase of conductivity of the solution. In these cases, the high-frequency titration curve should be similar...

High-frequency titration curves are discussed for various methods of experimental determination (the Q-meter, Z-meter and F-meter methods), using equivalent circuits for C-type and L-type titrating cells. It has been found that for the cases of L-type cell with Q-determination and C-type cell with Z- or F-determination, the quantity measured in the course of titration changes monotonously with .the increase of conductivity of the solution. In these cases, the high-frequency titration curve should be similar in shape to that obtained in an ordinary conductometric titration. Two mistakes appearing in literature are here pointed out. (1) The equivalent parellel circuit and the equivalent series circuit for the C-type titrating cell do give the identical result for the value of the conductance of the solution which gives the maximum loss of high-frequency energy in the cell. (2) The appearance of a maximum high-frequency loss with increasing conduc- tance of the solution in the C-type cell is not the result of the Debye-Falkenhagen effect. The use of Pt wire electrodes in direct contact with solution for high-frequency titration is suggested. Satisfactory titration curves have been obtained with wire electrodes and a series capacitor to act as a C-type cell with much less shielding troubles.

1.對高頻滴定用的C式和L式滴定池,Q表法,Z表法及F表法测定得到的滴定曲線,與溶液電導改變的關係,用等效電路的理論,作了全面的討論。除C式滴定池Q表法測定,文獻中已有討論外,L式滴定池Q表法測定時,和C式滴定池Z表法和F表法測定時,滴定過程中測定的量都與溶液的電導值單調變化。 2.指出了文獻中的錯誤。C式滴定池應用等效串聯電路與等效並聯電路計算的結果,是完全等同的。C式滴定池的高頻電能損耗與溶液中電解質濃度的關係,與Debye-Falkenhagen效應無關。 3.提出了用鉑絲電極直接插入溶液的高頻滴定法。

 
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