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negative-ion
相关语句
  负离子
     Air negative-ion concentration in waterfall in People's Park is 5760/cm3, which is the highest of the whole town.
     公园绿地中空气负离子浓度最高,于人民公园雒水岐小瀑布跌水处可达5760个/cm~3,空气质量指数Ci值远远超过1,平均为7.69;
短句来源
     Negative-ion element impurities breakdown model
     负离子元素杂质破坏模型
短句来源
     There are some disadvantages of existing purification methods (eg. High-efficiency filtration, Negative-ion purificatin, UV-oxidation purification, Nano-photocatalysis, Non-thermal plasma), such as low energy utiliztion, low purification life, low purification efficiency and low entire purification efficiency.
     吸附过滤技术、负离子净化技术、紫外净化技术、纳米光催化技术和低温等离子体净化技术等现有的净化技术存在能量利用率低、净化寿命短、净化效率低、完全净化率低等问题,不能很好地满足室内低浓度空气污染物净化的需要,因而有必要对净化技术进行改进,提高室内低浓度空气污染物的净化效率,减少中间有毒有害物质的生成,提高能量利用效率。
短句来源
     Vibrating Type Negative-ion Test Device and its Measurement Method
     振动型负离子测试装置与测试方法探讨
短句来源
     The results thow that yields of the negative ions exhibit a strong dependence on the velocity of the incident projetilis and the negative-ion yields for D+ and H+ of the same energy are independent of the thickness of the carbon targets.
     结果表明,负离子产额与入射离子的速度有关; 在同一能量下D~+和H~+离子的负离子产额都与靶厚度无关。
短句来源
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  “negative-ion”译为未确定词的双语例句
     METHODS The ginsenosides were isolated by analytical HPLC, then the positive- and negative-ion API-MS/MS of constituents collected from HPLC were measured.
     方法利用HPLC与API-MS/MS分析。
     The Direct Negative-ion ESI-MS Analyses of Neutral Fullerenes
     中性富勒烯分子的直接电喷雾质谱分析
短句来源
     Synthesis of Polyurethane Emulsion of Negative-ion Type
     阴离子型聚氨酯乳液的合成
短句来源
     This index is greatly higher than pure Pinus massoniana Lamb.'s index. The decrease-dust ratio of arbor-shrub-grass collocation type is 61.47%, the decrease-bacterial ratio is 56.8%,the CI value of air negative-ion is 2.34. The special boundary layer and double-layer structure type of suburb greenland greatly affect the city environment quality.
     以乔灌草配置类型的减尘率高达61.47%,减菌率为56.8%,空气质量评价指数CI值为2.34。 城郊绿地独特的下垫面及复层结构类型对城市环境质量良性的生态影响是显著的、多效的。
短句来源
     The small negative-ion concentration was higher in garden area than in habitation, in campus, and in traffic road.
     道路交通区的小正离子浓度最大,园林绿化区最低,居住区和文教区相当。 道路交通区的大正离子浓度最大,园林绿化区最小,居住区和文教区相当;
短句来源
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  相似匹配句对
     and V.P. tests are negative.
     MR和 V.P.
短句来源
     Gram-negative;
     革兰氏染色阴性;
短句来源
     ON THE “NEGATIVE PLANNING”
     论“反规划”
短句来源
     On negative good-will
     再议负商誉
短句来源
     Negative Derivative and Its Application
     负导数及其应用
短句来源
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  negative-ion
The negative-ion distribution is broader, less stable, and the average mobility shifts from about 2.1 to 1.7 cm2 volt-1 sec-1 with the addition of water vapor.
      
This negative-ion resputtering can result in amorphization or re-sputtering of the phosphor films.
      
Overall, 26 of the 30 metabolites could be covered between the positive and negative-ion modes.
      
The difference in negative-ion mass spectra of isomeric N-(methylsulfonyl)anilines has been revealed.
      
Negative-ion mass spectra of some N-mesyl derivatives of o-(cycloalk-2-enyl)-, o-(cycloalk-1-enyl)-, o-(pent-2-enyl)-, o-dibromo
      
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In a wide pH range, the change of acidity of silicic acid solution was studied during the process of polymerization, it was found that when the initial acidity of the solution was higher than that of the isoelectric point, the hydroxyl ion concentration of the solution decreased during polymerizaion and the increment, △[OH], was therefore negative, and when the initial acidity was lower, △[OH~-] increased with the concentration of silicic acid and the initial pH of the solution. On the basis of the theory proposed...

In a wide pH range, the change of acidity of silicic acid solution was studied during the process of polymerization, it was found that when the initial acidity of the solution was higher than that of the isoelectric point, the hydroxyl ion concentration of the solution decreased during polymerizaion and the increment, △[OH], was therefore negative, and when the initial acidity was lower, △[OH~-] increased with the concentration of silicic acid and the initial pH of the solution. On the basis of the theory proposed previously that polymerization of silicic acid proceeds according to two different mechanisms, the above findings are explained. When the initial acidity of the solution was high, polymerization of silicic acid proceeded by olation of a neutral molecule with a positive ion of the acid, and during the whole process, hydrogen ions were given out and hence hydroxyl ion concentration decreased. When the acidity was low, polymerization of silicic acid was oxolation of a neutral molecule with a negative ion of the acid with elimination of a hydroxyl ion and hence the amount of this ion in solution increased during the process. When the acidity was at the isoelectric point and in its neighborhood, both olation and oxolation took place during the polymerization process, and so no noticeable change in pH of the solution was observed.

一、在較广pH范圍内,研究了硅酸在聚合过程中溶液酸度变化的現象。在硅酸溶液原始酸度小於等电点的pH值吋,溶液原始氢氧离子濃度与最后氫氧离子濃度之差△[OH]为負值;大於等电点时,△[OH]值随原始pH值和濃度增高而增加。二、根据以前所提硅酸聚合的两种机制,說明了在原始溶液酸度小於等电点pH值时,硅酸的聚合是硅酸的中性分子和負离子的氧鍵合作用,有氢氧离子釋出,故溶液中的这种离子增多;原始溶液酸度大於等电点pH值时,硅酸的聚合作用中有氫离子釋出,故溶液中氫氧离子減少;在等电点及具附近,硅酸同时以两种方式聚合,故溶液酸度无显著变化。

The Polymerization of styrene under γ-irradiation at-78℃ in ethyl bro- mide solution at different concentration was investigated. The rate of polyme- rization increases with the decreasing of styrene concentration; at low conce- ntration level, it passes through a maximum, then falls down rapidly. The molecular weight of the polymer obtained varies slightly at monomer concent- ration above 15 mol. %, but it drops rapidly with the decreasing of monomer concentration. The G value of initiation, calculated from...

The Polymerization of styrene under γ-irradiation at-78℃ in ethyl bro- mide solution at different concentration was investigated. The rate of polyme- rization increases with the decreasing of styrene concentration; at low conce- ntration level, it passes through a maximum, then falls down rapidly. The molecular weight of the polymer obtained varies slightly at monomer concent- ration above 15 mol. %, but it drops rapidly with the decreasing of monomer concentration. The G value of initiation, calculated from the total energy absorbed by solvent and monomer, does not depend upon the monomer conce- ntration. From the experimental results and preliminary kinetic data, one may consider that the polymerization reaction proceeds by an ionic mechanism. The formed from the ethyl bromide by radiolysis anticipates the initiation directly. In the presence of ethyl bromide, hot electron is mainly captured by the and formed into negative ion; the styryl cation is quite unstable, it does not initiate polymerization directly. When the monomer concentration is sufficient high, termination proceeds through monomer transfer reaction, and monomolecular termination is more favourably at low monomer concentration. Good agreement between the proposed schemes and experimentally determined values was observed. The influence of aditives to the conversion further comfirms that polymerization proceeds by ionic mechanism, the free radical mechanism constitutes only a neglectable portion(<1%).

研究了苯乙烯在不同浓度溴乙烷溶液中,-78℃γ-射线辐射聚合。聚合 速度随苯乙烯浓度减小而上升,在低浓度区通过最大值然后迅速下降。所得聚 合物分子量在单体浓度15%(克分子)以上变化不大,而低浓度范围内,随单 体浓度降低迅速下降。按溶剂及单体获得的总能量计算引发G值随浓度变化不 大。根据实验结果及动力学初步演算可认为,聚合反应是按离子历程进行的。 溴乙烷辐照生成C离子直接参与引发。当溴乙烷存在下,热电子主要被其 俘获形成负离子,而苯乙烯正离子不稳定,不直接引发聚合反应。在单体浓度 较高时终止反应通过单体转移,在低浓度时,为单分子终止。所获结果与实验 事实较好地符合。 添加物对转化率的影响进一步证明了聚合按离子历程进行.自由基聚合部 分极少(小于1%),可忽略不计。

Solubility data of KClO4 in mixed solvents, namely, methanol-benzene, methanol-toluene, methanol-Carbontetrachloride and methanol-cyclohexane, are reported in this paper, The "free ion" concentrations of KC1O4 and KNO3 are calculated by using the association constants given by A,D'Aprano and C. W. Davies[2] of these salts in methanol, The medium activity coefficients fMX expressed in terms of S0/Smand (S0)±/(Sm)± are approximately equal and related to rnol fraction XNc of nonelectrolytes in the mixed solvents...

Solubility data of KClO4 in mixed solvents, namely, methanol-benzene, methanol-toluene, methanol-Carbontetrachloride and methanol-cyclohexane, are reported in this paper, The "free ion" concentrations of KC1O4 and KNO3 are calculated by using the association constants given by A,D'Aprano and C. W. Davies[2] of these salts in methanol, The medium activity coefficients fMX expressed in terms of S0/Smand (S0)±/(Sm)± are approximately equal and related to rnol fraction XNc of nonelectrolytes in the mixed solvents by the following empirical formula: lg/MX = kXNe where So and Sm are solubilities of salts in methanol and mixed solvensts respectively; the Subscript ± is used for the "free ion" and k is a constant. The formula for the Solvation number of electrolyte n+ +n-=-2lgfMX/lgφP is not valid for KClO4 in these Mixed solvents, where n+ +n- is the sum of the solvation number of positive and negative ion; φp is the volume fraction of methanol in mixed solvents, This result indicates that the solvation layer of ClO4 is not entirely formed by the methanol molecules and the nonelectrolyte exerts some effects on the solvation layer too.experimental data of KNO3, formulas of the solubility and of Solvation numbers are quoted from the former paper of li, Huang and liu[1].

本文测定了KClO_4在甲醇-苯,甲醇-甲苯,甲醇-四氯化碳及甲醇-环己烷四个混合溶剂中的溶解度。使用A.D'Aprano[4]和C.W.Davies[2],报告的KClO_4及KNO_3在甲醇中的缔合常数,计算得“自由离子”浓度。盐的介质效应活度系数f_(MX)以S_o/Sm或S_(o+)、D_(m±)的表示值趋近相等,与非电解质的摩尔分数X_(Ne的关系符合经验公式:1gf_(MX)=kX_(Ne),这里S+o和S_m分别是盐在甲醇和混合溶剂中的溶解度;脚注(±)标识“自由离子”;k为常数。电解质的溶剂化数公式:n_++n_-=-21gf_(MX)/1gφ_ρ,对KClO_4在这些混合溶剂中的情况并不适用,这里n_++n_-是正、负离子溶剂化数之和;φ_p是甲醇在混合溶剂中的体积分数。这个结果表明ClO_4~-的溶剂化层不是完全由甲醇分子所形成,非电解质也影响着ClO_4~-在这些溶剂中的溶剂化层。 KNO_3的实验数据,溶解度公式和溶剂化数公式是引自李芝芬、黄子卿、刘瑞麟以前的论文。

 
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