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powder of
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     In this paper,TiB2powder of 99.34% purity is prepared by vacuum carbothermic reduction of TiO2 and B2O3 based on the thermodynamics analysis of the reaction TiO2+B2O3+5C→TiB2+5CO↑.
     在对碳热还原反应TiO2+B2O3+5C→TiB2+5CO↑进行热力学计算的基础上,采用真空碳热还原TiO2和B2O3的方法,制备出了纯度达99.34%的TiB2粉末
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     Permanent magnetic powder of nanocomposite Nd_2Fe_(14)B/α-Fe prepared by mechanical milling
     机械球磨法制备纳米晶复相Nd_2Fe_(14)B/α-Fe永磁粉末
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     0.5 g powder of PVRs was added to 10 mL water, which were infused into the mice by 10 mL/kg;
     取粉末提取物0.5g,加水10mL,按10mL/kg灌胃;
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     The nanocrystalline powder of Al-15%Pb-4%Si-1%Sn-1.5%Cu (mass%) were prepared by mechanical alloying.
     通过机械合金化制备了 Al-15%Pb-4%Si-1%Sn-1.5%Cu(质量分数)纳米晶粉末
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     PREPARING COMPOSITE POWDER OF WC Co Cr 2C 3 BY MECHANICAL ALLOYING
     用机械合金化制备超细WC-Co-Cr_3C_2复合粉末
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  “powder of”译为未确定词的双语例句
     Study on the Preparation and Characteristics of the Nanometer Powder of Realgar, Margarita and Rhizoma Coptidis
     珍珠、雄黄和黄连纳米粉体的制备与特性研究
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     Photogeneration of Hydrogen fom Water Using the Powder of(Zn·Cd)S:Ag
     (Zn.Cd)S:Ag光解水放氢的研究
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     Study on the Transformation Induced by Powder of Metal Nickel and Nickel Chloride in Cultured Syrian Hamster Embryo Cells
     金属镍粉和氯化镍对叙利亚地鼠胚胎细胞转化的研究
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     PREPARATION OF ULTRAFINE POWDER OF TiO_2 BY LASER IRRADIATION
     激光加热气化法制备TiO_2超细粉
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     PREPARATING ULTRAFINE POWDER OF Al(OH)_3,γ-AIOOH AND Al_2O_3 BY PRECIPITATIONH YDROTHE RMAL-CALCINING
     沉淀—水热法制备超细Al(OH)_3γ—AlOOH和Al_2O_3
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  相似匹配句对
     Powder Coating
     粉末涂料
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     Powder electropainting
     粉末电泳涂漆
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     Levelling of Powder Coatings
     粉末涂料的流平问题
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     Micritization of Ti(C,N) Powder
     Ti(C,N)粉末的微晶化
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  powder of
Redispersion of Highly Disperse Powder of Titanium Dioxide in Aqueous Medium
      
The adsorption of nitrogen on a powder of nanocrystalline silicon at 77 K is studied, and adsorption isotherms obtained for nanocrystalline silicon and nonporous silica adsorbents with identical specific surface areas are compared.
      
A finely crystalline powder of the tetragonal solid solution based on zirconia with a crystal size of less than 40 nm is synthesized from zirconium and cerium peroxides.
      
The thermal expansion of polycrystalline barium diborate prepared by crystallization of the glass powder of the same composition is investigated.
      
The application of the proposed method is illustrated using a nanocrystalline powder of tungsten carbide WC.
      
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A method for preparing the high acid-consuming-capacity dried aluminium hydroxide powder by the use of alum and soda or other alkali substance as raw material is described. 1) The best results were obtained by using soda as raw material for preparing the alkali solution. 2) The alum solution was added to the alkali solution until pH 5.5-6.5 was reached. 3) The sulfate was removed almost completely by washing with potassium bicarbonate solution(0.4%) before drying. 4) The aluminium hydroxide gel can be dried...

A method for preparing the high acid-consuming-capacity dried aluminium hydroxide powder by the use of alum and soda or other alkali substance as raw material is described. 1) The best results were obtained by using soda as raw material for preparing the alkali solution. 2) The alum solution was added to the alkali solution until pH 5.5-6.5 was reached. 3) The sulfate was removed almost completely by washing with potassium bicarbonate solution(0.4%) before drying. 4) The aluminium hydroxide gel can be dried completely under 100-105℃(ca. 6 hrs.) without influencing the antacid activity. 5) The highest acid-consuming-capacity of the dried powder of aluminium hydroxide gel(free from any free alkali) was determined to be 315.9 ml, i.e. one gram dried sample will neutralize 315.9ml 0.1N HCl.

1.以明礬液倒入碳酸钠溶液中,混合液之酸度须控制为pH6(±0.5)。 2.所得膠体,先用普通水洗滌,继用0.4%碳酸氢钾溶液在抽氣漏斗上洗滌。除去硫酸鹽之手續须一次完成之,烘乾以後即不能重行处理,否则,制酸力急速下降。 3.乾燥可控制在90—110℃(约6—10小时),大量烘乾时应注意湿空氣之排出。 4.产品的制酸力一般为250—280毫/克,最高达315.9毫升/克;硫酸鹽之含量远低於药典规定;游离鹼亦远低於苏联药典之规定。

In the present paper a method for the isolation of ergometrine from ergot by means of ion exchange is described. The air-dried powder of ergot was extracted with 0.05N HC1 and the extract was passed over the ion exchange resin. It was found that out of six ion exchange resins of sulphonated styrene-divinylbenzene type, the best for the adsorption of ergot alkaloids from the extract was the resin with 2% cross-linking in hydrogen form. Adsorption was optimum at pH 3.5—5.9. After treatment with 5% NH4OH,...

In the present paper a method for the isolation of ergometrine from ergot by means of ion exchange is described. The air-dried powder of ergot was extracted with 0.05N HC1 and the extract was passed over the ion exchange resin. It was found that out of six ion exchange resins of sulphonated styrene-divinylbenzene type, the best for the adsorption of ergot alkaloids from the extract was the resin with 2% cross-linking in hydrogen form. Adsorption was optimum at pH 3.5—5.9. After treatment with 5% NH4OH, the alkaloids were removed from the resin with acetone-ether (3:7) or acetone-chloroform (7:3) in a Soxhlet. Ergometrine can be separated from the other ergot alkaloids with chloroform in which the former is insoluble as solvated crystals. A procedure for the isolation of ergometrine from ergot has been proposed, and small scale runs gave yields of 60—70% (based upon the ergometrine content of the ergot).

研究了利用离子交换树脂从麦角中分离麦角新碱的方法.用0.05N盐酸溶液从麦角粉末中提取出总生物碱,然后通过离子交换树脂.在6种国产不同交联度的苯乙烯磺酸氢型树脂中,以强酸1—2树脂对酸水提取液中麦角生物碱的交换量最高.酸水提取液的pH以3.5—5.9较为合适.试验证明,采用先碱化树脂,使麦角生物碱游离,再在Soxhlet提取器中用丙酮-乙醚(3:7)或丙酮-氯仿(7∶3)混合溶剂洗脱生物碱的方法,不但可以得到较高的洗脱率,同时节省了有机溶剂.以后利用麦角新碱能与氯仿形成复合结晶,却又难溶于氯仿的特性,可以使麦角新碱与其他麦角生物碱分离.小量试制结果,麦角新碱的收率为60—70%.

The leafhopper, Empoasca subrufa Melichar is one of the important insect pests ofrice, wheat, sugarcane, sorghum, etc. in South China. The plants thus damaged willshow numerous white spots on the leaves. The rice seedlings, under serious attack, witherrapidly. While at the later stage of development of rice it reduces the seed weight. The present study, conducted during 1957--1959 in Foochow and Minhou of Fukienprovince, deals with the biology of the insect. Four and sometimes five generations ayear are usually...

The leafhopper, Empoasca subrufa Melichar is one of the important insect pests ofrice, wheat, sugarcane, sorghum, etc. in South China. The plants thus damaged willshow numerous white spots on the leaves. The rice seedlings, under serious attack, witherrapidly. While at the later stage of development of rice it reduces the seed weight. The present study, conducted during 1957--1959 in Foochow and Minhou of Fukienprovince, deals with the biology of the insect. Four and sometimes five generations ayear are usually found. At the last generation the adults occur in October and Novem-ber in rice field, and after the crop has been harvested, they move to wheat and sugar-cane fields and to other cereal weeds along the sides of streams, pool and ponds wherethey overwinter. During the winter its destructive activity is still going on when theaverage daily temperature is above 11℃. The longevity of the female adults in summeris about 33 days, and the male adults 21 days, whereas that of the last generationadults lasts about 7 months. The duration of the egg stage in different generations variesfrom 5 to 14 days. The nymphal stage in different generations varies from 18--24 days.In summer, the preoviposition stage takes about 15 days. The adult lays its eggs singly in the midrib of the leaf of rice. In the earlier stageof the growth of rice, eggs are laid in the first and second leaves from the base, whileat the later stage, eggs are found mostly in the third leaf. In day time it rests uponthe upper and the middle parts of the crop. It moves higher toward the morning andevening. At mid-day it goes downward. It begins to appear in the rice field in March and then multiplies rapidly in May orJune. The population, decreasing during July and August, rises again in September. Theraining season in spring favors its growth and multiplication. In the control of this leafhopper, it is advisable to use: 1) 25% DDT emulsionmixed with wettable 6% γ BHC in 1:1:500, 2) a mixed powder of 5% DDT and0.5% γ BHC in 1:1 concentration, 3) an emulsion of 25% DDT in 1:300--400 partsof water, and 4) a powder of 2.5--5% DDT. Besides, based upon the study of its lifehistory and habits, clearing of weeds in winter before the wheat emerges is also con-sidered effective.

白翅叶蝉是福建省水稻的重要害虫,苗期受害严重者,整片稻苗苍白,甚至枯死;早稻孕穗、抽穗期常大量发生为害,影响谷粒饱满度,造成减产。福州和闽侯地区一年发生4代,部分5代。成虫越冬。冬季日平均温度达11℃以上时仍能取食为害。春季成虫侵入稻田,4月下旬前后大量产卵,5月中旬虫数激增,5月下旬或6月初达到高峰。早稻收割时由于农事活动引致若虫大量死亡。晚稻田于8、9月虫数较多,但危害不如早稻严重。10月中旬以后成虫逐渐离开稻田,迁往越冬场所。 寄主植物幼嫩茂密和较大湿度的小生境有利于白翅叶蝉的发育繁殖。大发生的气候因子主要是春季多雨。适宜的温湿度范围为温度20—25℃,相对湿度85—90%。 DDT单独使用或DDT与666混用防治白翅叶蝉都能收到满意的效果。早稻秧田宜在播种后两周施药防治;本田于5月中旬虫口密度开始增长之际施药,亦能抑制为害。冬季小麦出土以前清除田边杂草,也是一项有效的防治措施。

 
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