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选择性是
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  selectivity for
     Result show heteropoly acids and salts of Ti4+,Al3+ etc have very high catalytic activity and selectivity for esterification reaction.
     结果表明,杂多酸和Ti~(4+)、Al~(3+)等高电荷小体积离子的杂多酸盐具有极佳的催化活性和高选择性,是一类优秀的低温型酯化反应催化剂.
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     The catalyst was characterized by TPD MS, TPSR MS and adsorption measurement of C 2H 4 and O 2. The results showed that high C 2H 4/O 2 ratio adsorbed on the catalyst surface was favorable for the increase of selectivity for acetic acid.
     吸附量测定表明 ,吸附在催化剂表面上的C2 H4/O2 比值高对于提高乙酸的选择性是有利的
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     The Cs 2.5H 0.5PW 120 40/SiO 2 catalyst has good activity and selectivity for the etherification of tertiary amylenes and methanol, which could become an excellent solid acid catalyst for the etherification of tertiary olefins and methanol.
     Cs2 .5H0 .5PW1 2 0 4 0 SiO2 催化剂对于叔戊烯与甲醇的醚化反应具有良好的活性与选择性 ,是一种理想的叔戊烯与甲醇的醚化反应的催化剂。
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     Beer's law is obeyed in the range of 0-0.32 μg/mL for Fe*".The apparent molar absorptivity is (3.09×10~5 L· mol~(-1))·cm~(-1) at 744 nm.The proposed method is possible to be a high sensibility and selectivity for determination of Fe*" in pond water and tap water with simplicity,rapidity and accuracy.
     Fe(Ⅱ)在0~0 32μg/mL范围内符合比尔定律,表观摩尔吸光系数为3 09×105,方法具有很好的选择性,是一种简便,快速的富集分离和分析方法,应用于环境水样中铁的测定,结果令人满意。
短句来源
     It is suggestedthat salt tolerance in salt-tolerant variety is mainly due to its higher selectivity for K~+ relative to Na~+ duringtransport to the shoot.
     LD-1从根系至地上部的离子运输过程中,具有较大的 K~+选择性,是它具有较强耐盐性的主要原因.
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  “选择性是”译为未确定词的双语例句
     CO selective oxidation in hydrogen-rich gas over five catalytic systems of CuO/ZrO_2, CuO/MnO_2, MnO_2/CeO_2, CuO/CoO and CuO/CeO_2 were compared. 10%CuO/CeO_2 with the higher CO conversion and selectivity was the most suitable catalyst.
     比较了CuO/ZrO2、CuO/MnO2、MnO2/CeO2、CuO/CoO和CuO/CeO25种催化剂体系对富氢气体中CO选择性氧化的活性,发现CuO摩尔含量为10%的CuO/CeO2催化剂具有较高的CO转化率和选择性,是比较适合该反应的催化剂。
短句来源
     We propose that controlling the reaction heat of producing HCFC-133a and improving the selectivity to HFC-134a is a key to investigation of the reaction.
     认为控制生成HCFC-133a的反应热、提高HFC-134a的选择性是反应研究的关键。
短句来源
     Compared with the achievements of C_3H_6-SCR studies reported in literatures, only ca. 1/3 of the reductant in carbon moles was used in the case of C_2H_2-SCR, which means the selectivity of C_2H_2-SCR is almost 3 times as that of C3H6-SCR.
     该数据与文献使用丙烯为还原剂的较好研究相比仅使用其~1/3碳数的还原剂,这意味着本C_2H_2-SCR研究所得到的选择性是文献丙烯为还原剂所得结果的近3倍。
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     Four Al 2O 3 supports from different sources impregnated with an aqueous solution of the same amount of H 2PtCl 6·6H 2O. The catalysts were characteriaed by TPR,H 2-TPD and micro pulse catalytic chromatographic technique. The experimental results shows that TPR profiles,H 2-TPD spectra,dehydrocyclization activity and selectivity of n hexane are different in four catalysts using differents supports.
     以四种不同来源的Al2O3为载体,采用相同浓度的H2PtCl6·6H2O水溶液浸渍方法制取了四种Pt/Al2O3催化剂.同时使用程序升温还原技术,程序升温脱附技术以及微型脉冲催化色谱技术对其催化剂性能进行表征.实验结果表明,四种催化剂的TPR谱,H2-TPD谱以及正己烷脱氢环化活性和选择性是有差别的
短句来源
     While over hydrothermal treated catalysts,the high selectivity was originated from the depression of isomerization and dealkylation of 4,4'-DMBP.
     而经水热处理后高的选择性是来源于4,4' DMBP的异构化与脱烷基化反应受到抑制。
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  相似匹配句对
     SELECTIVE FLOCCULATION
     选择性絮凝作用
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     Selectivity of erosion
     侵蚀的选择性
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  selectivity for
At a special temperature, the method gives 100:1 selectivity for the perfect complement and single base mutation target.
      
Quantitative measurements were used to determine the selectivity for the incorporation of isotope-labeled valine residue, which was 96% in the case using AOAA.
      
It was shown that the voltage pulse parameters have an insignificant effect on both the product composition of cyclohexane oxidation and on selectivity for the products cyclohexanone (40.8%), cyclohexanol (49.5%), and water (9.7%).
      
This electrode exhibits much higher selectivity for nitrate and hydrocarbonate ions than ion-selective electrodes based on quaternary ammonium chlorides.
      
It is found that the sensor exhibits high selectivity for ammonia in the presence of vapors of saturated and aromatic hydrocarbons.
      
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The object of the present work is to investigate the characteristics of piezo-electric resonantors which are cut from the natural coloured quartz, and compare the results with those obtained from those plates cut from the ordinary clear quartz in order to see if coloured quartz might be used as piezo-electric material in practice. In this work four points were stressed, they are: (1) the frequency constants of piezo-electric oscillation, (2) its stability, (3) its selectivity and activity and (4) its frequency-temperature...

The object of the present work is to investigate the characteristics of piezo-electric resonantors which are cut from the natural coloured quartz, and compare the results with those obtained from those plates cut from the ordinary clear quartz in order to see if coloured quartz might be used as piezo-electric material in practice. In this work four points were stressed, they are: (1) the frequency constants of piezo-electric oscillation, (2) its stability, (3) its selectivity and activity and (4) its frequency-temperature coefficient curves. Further more a comparison of the characteristics of oscillations before and after the heat-treatment of the material was made. By the results of these experiments it concludes that the natural coloured quartz plates can be excited into piezo-electric oscillation and serve as piezo-electric resonantors. The frequency constant of a Y-cut plate from coloured quartz is about 2% lower than that of same type cut plate from clear quartz, while the frequency constants of the X-cut plate and the AT-cut plate from the coloured and clear quartz are practically the same. The heat-treatment to the three types cut plates of both kinds of quartz has a definite influence on their frequency. This effect is more pronounced to the coloured quartz plates. Likewise, heat-treatment improves, from the point-view of statistics, the selectivity and activity of oscillation of both kinds of quartz. Finally, the values of some coefficients of stiffness of the coloured and clear quartz were discussed.

本文的目的在于研究天然有色水晶在当作压电共振器用时它的压电振荡性能,并与无色水晶在这方面的性能上作一比较,以推断有色水晶是否可以应用到实际的控制电路振荡的工作中去。我们的工作分四方面进行:(一)有色水晶压电振荡的频率常数,(二)有色水晶压电振荡的稳定性,(三)有色水晶压电振荡的选择性及活动性,(四)有色水晶压电振荡的频率——温度系数。并且把有色水晶在用热处理方法去色后的这四方面实验结果与去色前的作一比较。实验的结果证明有色水晶是可以被激发压电振荡的,和无色水晶一样可以作控制电路振荡之用。有色水晶的Y-截法的频率常数比无色水晶的约低2%。至于两种水晶的其余两种X-截法及AT-截法的频率常数基本上无差别。热处理能使两种水晶的三种截法的压电振荡频率有增高的倾向,这效应在有色水晶中更为显著。同样,热处理对于两种水晶三种截法的压电振荡的选择性及活动性,在统计数字上看来是有益处的。最后,就以上测量的结果,推算了并讨论了有色水晶和无色水晶的若干劲度系数异同之点。

The present paper reports on two lamellicorn beetles: Adoretus tennuimacu-latus Waterh. and Liocola brevitarsis Lew. The former belongs to the subfamilyRutelinae and the later Cetoniinae. Adoretus tennuimaculatus has two generations per year at Lientang. Thefirst active period of adults mostly occured in June and the second period inAugust. After 7: 30 at night, the adults went out and stayed on various hostplant leaves feeding or copulating and then back into earth at dawn. Larvaewere not strict in selecting...

The present paper reports on two lamellicorn beetles: Adoretus tennuimacu-latus Waterh. and Liocola brevitarsis Lew. The former belongs to the subfamilyRutelinae and the later Cetoniinae. Adoretus tennuimaculatus has two generations per year at Lientang. Thefirst active period of adults mostly occured in June and the second period inAugust. After 7: 30 at night, the adults went out and stayed on various hostplant leaves feeding or copulating and then back into earth at dawn. Larvaewere not strict in selecting the soil but most of them lived in the garden soil,mound soil and. clay landside. Liocola brevitarsis has only one generation per year at Lientang. The adultperiod was from June to September and some of them lengthened out mid-Octo-ber. Adults flied out at day time and sucked the different part of hosts: as theflesh of fruit, the juice of tree and the corn ear, once in a few days. Larvaeselected the soils more strictly. They concentrated in compost and rich humussoil. Controlling methods: (1) To spray 0.5%γ666 or 25% DDT emulsion (250water:1 emulsion) once to the host leaves was effective in protecting against theadults of Adoretus till its last period of activity. (2) To shake the tree to makethe adults of Adoretus fall down and then unroll a piece of white cloth underthe tree to gather the adults. (3) To make a bamboo cylinder, 12-16 in. long,which was filled with rotten fruits and nectar, and trap all the adults of Liocolain this cylinder. (4) To clean out the compost before June in order to kill mostof the larvae and pupae of Liocola.

1.本文所述的两种金龟子,其一为茶色金龟子,属鞘翅目,金龟子科中的Rutelinae亚科,其二为铜色白纹金龟子,属Cetoniinae亚科。 2.茶色金龟子在莲塘一年发生二代。其第1次成虫盛期多在6月。第2次则在8月;铜色白纹金龟子,一年仅发生一代,其成虫出现期为6至9月,少数可延长到10月中旬。 3.茶色金龟子的成虫,为夜出性,傍晚7时半后,即开始出土,停息在多种寄主植物的叶片上,取食或交配,拂晓时飞返土中。铜色白纹金龟子的成虫,为日出性,取食成熟果子,玉米苞穗及多种树木的浆汁,亦喜取食。既钻入后,可连续数日不出。 4.两种金龟子的幼虫,都栖息在土中。茶色金龟子幼虫以在菜园土中、丘陵黄土地及属于粘壤性质的田塍内为多,对于土壤性质选择,较不严格。铜色白纹金龟子幼虫则多集中在腐熟的堆肥及腐殖质极丰富的土中,对于土壤,有比较严格的选择性。 5.关于防治方法:茶色金龟子在成虫期曾试用了0.5%γ体666粉及25%DDT乳剂(1份加水250份〕喷撒,第1种药适用于叶面较粗糙的植物,第2种则可用于叶面较光滑的植物,只要喷撒1次,便能在整个成虫发生期中,避免其飞来取食。铜色白纹金龟子的成虫,则可采用竹筒诱杀,筒高12—1...

1.本文所述的两种金龟子,其一为茶色金龟子,属鞘翅目,金龟子科中的Rutelinae亚科,其二为铜色白纹金龟子,属Cetoniinae亚科。 2.茶色金龟子在莲塘一年发生二代。其第1次成虫盛期多在6月。第2次则在8月;铜色白纹金龟子,一年仅发生一代,其成虫出现期为6至9月,少数可延长到10月中旬。 3.茶色金龟子的成虫,为夜出性,傍晚7时半后,即开始出土,停息在多种寄主植物的叶片上,取食或交配,拂晓时飞返土中。铜色白纹金龟子的成虫,为日出性,取食成熟果子,玉米苞穗及多种树木的浆汁,亦喜取食。既钻入后,可连续数日不出。 4.两种金龟子的幼虫,都栖息在土中。茶色金龟子幼虫以在菜园土中、丘陵黄土地及属于粘壤性质的田塍内为多,对于土壤性质选择,较不严格。铜色白纹金龟子幼虫则多集中在腐熟的堆肥及腐殖质极丰富的土中,对于土壤,有比较严格的选择性。 5.关于防治方法:茶色金龟子在成虫期曾试用了0.5%γ体666粉及25%DDT乳剂(1份加水250份〕喷撒,第1种药适用于叶面较粗糙的植物,第2种则可用于叶面较光滑的植物,只要喷撒1次,便能在整个成虫发生期中,避免其飞来取食。铜色白纹金龟子的成虫,则可采用竹筒诱杀,筒高12—16寸,筒内盛腐熟果子及蜜,贴靠枝杆悬挂,能将圆内所有成虫,全部诱入筒中。此外,前一种成虫,并可利用外出?

~~

在不同组成的催化剂(K_2O-Cr_2O_3-Al_2O_3)上进行了庚烷芳烃化反应,研究了催化剂中钾、铬浓度的改变对于芳烃化活性和碳沉积性能的影响.铬浓度增加时,芳烃化活性和碳沉积性能平行增加,两者比值保持不变.催化剂中加入氧化钾后,芳烃化活性显著增加而碳沉积性能则显著降低.因此,氧化钾是铬铝催化剂的一个具有良好选择性的助催化剂.

 
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