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层分离
相关语句
  layer separation
     Boundary Layer Separation Point Real Time Detection System Based on DSP
     基于DSP的边界层分离点实时检测系统
短句来源
     It provided information concerning the turbulent boundary layer separation and reattachment locations and the dimensionalities of the flow.
     它提供了关于测试表面流动结构的定性信息,诸如湍流边界层分离和再附,以及边界层流动的维数等。
短句来源
     Investigation of boundary layer separation control for supercritical airfoil using micro vortex generator
     微型涡流发生器控制超临界翼型边界层分离实验研究
短句来源
     TURBULENT BOUNDARY LAYER SEPARATION,REATTACHMENT AND REDEVELOPMENT OVER A BACK WARD-FACING STEP
     后向台阶湍流边界层分离、再附及发展
短句来源
     The Calculation of Triple-deck Theory of Boundary Layer Separation Flow
     边界层分离流动的三层结构理论计算
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  “层分离”译为未确定词的双语例句
     RESULTS: Seven compounds have been isolated from the n butanol extract, and one compound from the H 2O extract of this plant. They have been identified as (-) epicatechin (I), 2α,3β dihydromyricetin (II), myricetin (III), 2α,3β dihydroquercetin (IV), quercetin (V), esculetin (VI), xanthocerin (VII) and 2,5 dimethoxy p benzoquinone (VIII).
     结果:从正丁醇层分离鉴定了7个化合物,分别为(-)表儿茶精((-)epicatechin,I),2α,3β双氢杨梅树皮素(2α,3βdihydromyricetin,II),杨梅树皮素(myricetin,III),2α,3β双氢槲皮素(2α,3βdihydroquercetin,IV),槲皮素(quercetin,V),七叶内酯(esculetin,VI),文冠木素(xanthocerin,VII);
短句来源
     FTIR spectra exhibited that the surface of the faded samples were mainly covered with Si-O and Si-H.
     FTIR(红外吸收谱)表明多孔层分离后样品表面主要由Si—O、Si—H键组成;
短句来源
     Methods: Matrine in Xuanlijing Liniment was extracted by neutral alumina column chromatography. The chromatographic condition of HPLC included HP ODS Hypersil column, CH3CN-0.01 mol/L H 3PO 4- CH 3CH 2OH (8∶1∶1) as the mobile phase, detected at 205 nm, flow rate 0.8 ml/min and column temperature at room temperature.
     方法 :采用中性氧化铝柱层分离提取 ,HPLC法测定色谱条件以 HP ODSHypersil柱为固定相 ,乙腈 - 0 .0 1mol/ L磷酸水溶液 -无水乙醇 (8∶ 1∶ 1)为流动相 ,检测波长 2 0 5 nm,流速 0 .8ml/ min,柱温为室温。
短句来源
     Results Eight known compounds were isolated from Mesona chinensis Benth. Their structures were identified as:caffeic acid(1),3-(4-ethoxy-3-hydroxy-phenyl)-acrylic acid(2),caffeic acid ethyl ester(3),kaempferol(4),scutalpin(5),2-hexadecyl-octadecanoic acid(6),ursonic acid(7),stigmasterol(8).
     结果从凉粉草体积分数为65%的乙醇提取物的氯仿层和乙酸乙酯层分离得到8个化合物:咖啡酸(1)、3(4乙氧基3羟基苯基)烯丙酸(2)、咖啡酸乙酯(3)、山奈酚(4)、高山黄芩素(5)、2十六烷基-十八烷酸(6)、熊果酸(7)和豆甾醇(8);
短句来源
     Detection Method of Boundary-Layer Separation Point Based on Micro Pressure Sensor Array
     基于微型压力传感器阵列的边界层分离点检测方法
短句来源
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  相似匹配句对
     NUMERICAL SOLUTION OF BOUNDARY LAYER SEPARATED FLOWS
     边界分离数值解
短句来源
     PAPER CHROMATOGRAPHIC SEPARATION AND SPECTROPHOTOMETRIC DETERMINATION OF LYCORINE
     石蒜碱的纸分离和分光光度测定
短句来源
     Separation of Nitrochlorobenzenes
     硝基氯苯的分离
短句来源
     THE SEPARATION OF METHLNAPHTYALENE
     甲基萘的分离
短句来源
     The M layer of the interface phase was showed to be an f.
     界面相的M为f.
短句来源
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  layer separation
Study of laminar boundary layer separation on a cone at an angle of attack
      
If the intensity of the shock wave is greater than the limiting value, a boundary layer separation zone is formed, and the flow rearranges itself so that the intensity of the shock wave 2 ahead of the separation zone (Fig.
      
Approximate calculation of the critical pressures for turbulent boundary layer separation and attachment in supersonic flow
      
Theory of laminar boundary layer separation in supersonic flow
      
Necessary condition for three-dimensional boundary layer separation
      
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The active principle of Hemerocallis thunbergii Baker was isolated by extraction from the pulverized drug with chloroform in Soxhlet apparatus. By chromatography on aluminium oxide, a yellow powder (sample Ⅰ) was obtained, which became brownish and sintered above 243℃, and finally melted at 266—269℃ under decomposition. Its LD_(50) to mice was 0.95 mg/20 g body weight. Recrystallization from dimethyl formamide yielded orange red crystals (sample Ⅱ), which also became brownish, sintered above 240℃ and melted...

The active principle of Hemerocallis thunbergii Baker was isolated by extraction from the pulverized drug with chloroform in Soxhlet apparatus. By chromatography on aluminium oxide, a yellow powder (sample Ⅰ) was obtained, which became brownish and sintered above 243℃, and finally melted at 266—269℃ under decomposition. Its LD_(50) to mice was 0.95 mg/20 g body weight. Recrystallization from dimethyl formamide yielded orange red crystals (sample Ⅱ), which also became brownish, sintered above 240℃ and melted at 268—269℃ under decomposition. Its effect and toxicity were greatly dropped; the LD_(50) could not be determined below 60 mg/20g. But the effect and the toxicity reappeared when the dose was greatly increased. Dissolve the orange red crystals in sodium hydroxide solution and then acidify by diluted hydrochloric acid, a yellow powder (sample Ⅲ) was again obtained, which also became brownish, sintered above 240℃, and melted at 268—269℃ under decomposition. Its LD_(50) was 0.34 mg/20 g. The results of experimental therapy of schistosomiasis japonica in mice indicated that the effect of the drug was parallel to its toxicity. The samples Ⅰ,Ⅱ and Ⅲ showed no depression on the determination of the mixed melting point. Their infrared spectrum and that of their acetyl derivatives were all identical. Paper chromatographic tests with three different solvent systems showed in each case only one reddish-violet spot on spraying with ferric chloride reagent. These results indicated that the samples, Ⅰ, Ⅱ and Ⅲ may be the one and same compound whose empirical formula is C_(16)H_(14)O_4. The name "hemerocallin" was suggested for the active principle obtained.

百合科萱草属萱草根(Hemerocallis thunbergii Baker),系一种治疗血吸虫病的中药。經过氯仿提取,通过氧化鋁色层分离,能获得一种黄色粉末(萱草根成分Ⅰ),在243℃时变棕色,266—269℃时熔融(分解)。經用小白鼠測毒試驗,LD_(50)为0.95毫克/20克,同时出現疗效。用甲酰二甲胺重結晶,得橘紅色結晶(萱草根成分Ⅱ),在240℃时变棕色,268—269℃时熔融(分解),毒性与疗效却大大降低,但当剂量增大时,毒性与疗效又同时出現。继以碱液溶解結晶,加酸酸化,又得黄色粉末(萱草根成分Ⅲ),在240℃时变棕色,268—269℃时熔融(分解),LD_(50)为0.34毫克/20克。萱草根成分Ⅰ,Ⅱ,Ⅲ虽然毒性大小有差別,但是,在化学上均为弱酸性物貭,它們的溶解情况、显色反应和熔点等都相同;而且,相互間的混合熔点也不降低;在紅外綫吸收光譜上,所呈現的吸收峯也相一致;紙上层析試驗,在三种不同的溶解系統中,均得相似的一个斑点;它們在相同条件下进行乙酰化,分別获得熔点为240—241℃的白色板状結晶,相互間的混合熔点也不降低,紅外綫吸收光譜也相一致。根据上述結果,从化学上看来,萱草...

百合科萱草属萱草根(Hemerocallis thunbergii Baker),系一种治疗血吸虫病的中药。經过氯仿提取,通过氧化鋁色层分离,能获得一种黄色粉末(萱草根成分Ⅰ),在243℃时变棕色,266—269℃时熔融(分解)。經用小白鼠測毒試驗,LD_(50)为0.95毫克/20克,同时出現疗效。用甲酰二甲胺重結晶,得橘紅色結晶(萱草根成分Ⅱ),在240℃时变棕色,268—269℃时熔融(分解),毒性与疗效却大大降低,但当剂量增大时,毒性与疗效又同时出現。继以碱液溶解結晶,加酸酸化,又得黄色粉末(萱草根成分Ⅲ),在240℃时变棕色,268—269℃时熔融(分解),LD_(50)为0.34毫克/20克。萱草根成分Ⅰ,Ⅱ,Ⅲ虽然毒性大小有差別,但是,在化学上均为弱酸性物貭,它們的溶解情况、显色反应和熔点等都相同;而且,相互間的混合熔点也不降低;在紅外綫吸收光譜上,所呈現的吸收峯也相一致;紙上层析試驗,在三种不同的溶解系統中,均得相似的一个斑点;它們在相同条件下进行乙酰化,分別获得熔点为240—241℃的白色板状結晶,相互間的混合熔点也不降低,紅外綫吸收光譜也相一致。根据上述結果,从化学上看来,萱草根成分Ⅰ,Ⅱ,Ⅲ可能是同一种物貭,这种物貭系治疗血吸虫病的有效成分。經药理試驗証明,成分Ⅰ,Ⅱ,Ⅲ的药理作用尚有程度上的不同,这种現象可能与化学結构有关,尚待更多实驗闡明。这个化合物暫定名为萱草根素(hemerocallin),分子式为C_(16)H_(14)O_4。

A method for the paper chromatographic separation and subsequent spectrophotometric determination of lycorine in plant drugs is described. 4g of the powdered sample is extracted with 95% ethanol in a Soxhlet apparatus. The ethanolic extract is concentrated and then dissolved with hot 70% ethanol to a volume of 10ml. Exactly 0.1ml of the clear solution is taken for paper chromatography on a sheet of Whatman No. 1 paper with n-C_4H_9OH-C_2H_5OH-NH_4OH-H_2O (90:10:1:97 v/v), by which lycorine can be separated from...

A method for the paper chromatographic separation and subsequent spectrophotometric determination of lycorine in plant drugs is described. 4g of the powdered sample is extracted with 95% ethanol in a Soxhlet apparatus. The ethanolic extract is concentrated and then dissolved with hot 70% ethanol to a volume of 10ml. Exactly 0.1ml of the clear solution is taken for paper chromatography on a sheet of Whatman No. 1 paper with n-C_4H_9OH-C_2H_5OH-NH_4OH-H_2O (90:10:1:97 v/v), by which lycorine can be separated from other alkaloids in the sample. Lycorine is viewed under u.v. light as a greenish-blue fluorescent spot, which is cut from the paper and macerated for 4 to 8 hours with exactly 5 ml of ethanol. The optical density of the ethanolic solution is determined at 288 mμ in a spectrophotometer, ethanol being used as a blank. The amount of lycorine is calculated from a standard graph. The percent recovery of pure lycorine is 93.7±1.1% by this method, and this should be taken into account in calculating the lycorine content of the sample. The average deviation of the method is±5%.

用95%酒精回流提取石蒜总生物碱,经用正丁醇:乙醇:氢氧化铵:水(90:10:1:97 v/v)混合液的上层溶液为推进剂,进行上行纸层分离后,石蒜碱可以很好地与石蒜中其他生物碱分开。纸上的石蒜碱在萤光灯下呈蓝绿色斑点,斑点经酒精洗脱后,可在紫外分光光度计波长288毫微米处测其含量。本法的回收率为93.7±1.1%,样品分析时的平均百分偏差约为±5%。

~~

进行了撫順残植煤的化学—工艺性质的評述。研究了残植煤各岩相組分(鏡煤类物质、孢子残体、树脂体)的一次焦油的組成;特别详细地采用紅外光譜和色层分离方法研究了树脂体焦油。撫順残植煤是很好的低溫干餾的原料。在热载体並流、多次往复循环实驗炉中进行的低溫干餾結果表明,可从残植煤得到较高收率的轻质化学产品和大量宝貴的煤气。采用色层分离法系統研究了撫順残植煤焦油的中性油的族組成。首次研究了低溫焦油中丙酮可溶性酚的組成。結果表明,在氮气流中进行甲基化,用色层法分离酚甲醚,並随后用化学、物理方法鑑定各組分,可以认为是比較好的一种研究重餾分混合酚的方法。

 
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