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purity
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  纯度
     Purity Identification of tomato hybrid by RAPD markers & Searching for RAPD markers linked to the WO and Tm-2 gene in tomato
     RAPD法鉴定番茄杂种纯度及番茄WO和TM-2基因RAPD标记的研究
短句来源
     Study on New Techniques to Produce High Purity Magnesium Carbonate and Magnesia from Magnesite and Dolomite
     白云石、菱镁矿生产高纯度碳酸镁和氧化镁新工艺研究
短句来源
     Studies on Production Security and Variety Purity Identification Technology of Hybrid Rice
     杂交水稻生产安全及种子纯度鉴定技术研究
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     The Freguency Spectrum Purity Analysis for an Output Signal of a Digital Frequency Synthesizer
     数字式频率合成器输出信号频谱纯度的分析
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     Ultrasonic Method For Analysing The Chlorine Gas Purity In Indusiry
     分析工业氯气纯度的超声方法
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  纯度的
     Determination of Radiochemical Purity of ~(125)I-TOC and ~(125)I-F-PGA
     ~(125)I-TOC和~(125)I-F-PGA放射化学纯度的测定
短句来源
     Results: The average of purity of extracted DNA is 1.58,the average of concentration of that is 58.6 ng/μL,and the molecular weight of that is about 23 kb,without RNA.
     结果,提取DNA纯度的平均值1.58,浓度的平均值58.6 ng/μL,分子量大约23 kb,无RNA污染.
短句来源
     Measuring of Radiochemical Purity of Myocardial Imaging Agent ~(99)Tc~mN(NOEt)_2
     心肌显像剂~(99)Tc~mN(NOEt)_2放化纯度的分析
短句来源
     The Influence of Preparative Condition on the Size and Purity of Fe_3O_4 Ultrafine Particles
     制备条件对Fe_3O_4超微粒粒度和纯度的影响
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     THE SEPARATION OF HIGH PURITY ~(233)Pa FROM ~(237)Np
     从~(237)Np中分离高纯度的~(233)Pa的新方法
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  纯净度
     wood knife threshing(0.8 cm sieve) got the most seed number,937.3 g seeds were extracted from 10 kg materials,showing 8.37% damage,88.33% seed purity and 92.33% germination rate,ranked the second among eight methods.
     木刀脱粒机脱粒法(筛孔直径0.8 cm)获得的种子数量最多,10 kg种子材料可获得937.3 g种子,种子的破损率也较小,为8.37%,种子的纯净度为88.33%,种子的发芽率高达92.33%,仅次于人工锤打脱粒法。
短句来源
     The weldability, deposited metal's mechanical properties and purity of the new developed shell butt welding SAW material as the same level compared with Kobe Steel US-521HD/PF-500D.
     研制的容器主焊缝埋弧焊材与国外典型的埋弧焊焊材在焊接工艺性能和熔敷金属力学性能及纯净度方面对比,结果表明研制焊材与日本神户制钢所的US-521HD/PF-500D焊材相当。
短句来源
     The experimental results showed that the purity of vacuum-refined steel was remarkably improved, thus its fracture toughness increased markedly.
     试验结果表明,通过真空感应炉和真空自耗炉两次真空冶炼工艺,提高了钢的纯净度,明显改善钢的断裂韧度。
短句来源
     the demonstrative quantity of seeds was 10.3kg/667m2 according to the thousand-seed weight,nursery germinating rate,seed purity and unit yield of seedlings.
     根据种子千粒重、场圃发芽率、种子纯净度和单位面积产苗量等估算出红楠种子理论播种量为10.3kg/667m2。
短句来源
     In order to improve the purity of Austenitic Stainless Steel lCrl8Ni9Ti used in aviation,smelting process by vacuum induction furnace was studied. The results have shown that through controlling element content to Cr/Ni≤l. 80,7.7≤Ti/C≤15.5,Al<0.10% of lCrl8Ni9Ti smelted by VIF,intergranular corrosion was avoided,crazing of the steel was decreased to enhance the plastic properties as well.
     为提高航空用奥氏体不锈钢1Cr18Ni9Ti的纯净度,使用真空感应炉熔炼(VIM),对1Cr18Ni9Ti的冶炼工艺进行了研究,结果表明:控制Cr/Ni≤1.80,7.7≤Ti/C≤15.5,Al<0.10%,可以避免晶间腐蚀发生,并且可以减少管材开裂,提高热塑性。
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  “purity”译为未确定词的双语例句
     Theory and Application Studies on Preparing High Purity Zinc in the System of Zn(Ⅱ)-NH_3-NH_4Cl-H_2O
     Zn(Ⅱ)-NH_3-NH_4Cl-H_2O体系制备高纯锌理论及应用
短句来源
     Study on Isolation, Purity, Pharmacological Activity and Mechanism of Trametes Versiolor Polysaccharide
     云芝多糖分离、纯化、药理活性及其作用机制研究
短句来源
     Analyses on the Current Status of Seed Purity in Main Grain and Oil Crop Hybrids in Sichuan Province and Studies on the Management Countermeasures
     四川粮油作物杂交种质量现状分析及管理对策研究
短句来源
     Theory and Application Studies on Preparing High Purity Zinc in the System of Zn(Ⅱ)-NH_3-NH_4Cl-H_2O
     Zn(Ⅱ)-NH_3-NH_4Cl-H_2O体系制备高纯锌理论及应用
短句来源
     APPLICATION OF THIOKINASE IN THE RAPID DETERMINATION OF COENZYME A PURITY
     硫激酶在快速测定辅酶A中的应用
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  purity
Starting with isovanillin, a two-step sequence involving reductive amination and N-benzylation was performed to provide the compounds in good purity.
      
After the crude product is recrystallized from tetrahydrofuran (THF), the final product is obtained with purity above 99%.
      
The polycrystalline materials of SrWO4 were synthesized by means of a solid phase reaction with analytical purity SrCO3 and WO3 at high temperature.
      
The purity of CPS-0 was determined by HPLC and the structure was elucidated by monosaccharide composition analysis, methylation analysis, GC, GC-MS, NMR spectral (1H-NMR, 13C-NMR, HMQC), UV, IR, and elemental analysis.
      
After AACH has been calcined at 1200°C for 2 h, the ultrafine α-Al2O3 with uniform particle size, spherical shape, and more than 99.97% purity is obtained and its powder is well dispersed.
      
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An addition product which is very likely a β-sultone was obtained from the spontaneous reaction between chlorotrifluoroethylene and sulfur trioxide as a distillable colorless liquid (Ia+Ib; b. p. 76.0—76.5°, n_D~(20°) 1.3672, d~(21.8°) 1.71). Its structure was elucidated by elementary analysis, determinations of molecular weight and saponification equivalent, and its infrared spectrum. Preliminary studies of its chemical behavior are also here reported.Similarly, from the reaction of sulfur trioxide with 4,...

An addition product which is very likely a β-sultone was obtained from the spontaneous reaction between chlorotrifluoroethylene and sulfur trioxide as a distillable colorless liquid (Ia+Ib; b. p. 76.0—76.5°, n_D~(20°) 1.3672, d~(21.8°) 1.71). Its structure was elucidated by elementary analysis, determinations of molecular weight and saponification equivalent, and its infrared spectrum. Preliminary studies of its chemical behavior are also here reported.Similarly, from the reaction of sulfur trioxide with 4, 5-dichloroperfluoropentene1 (IV), 4, 6, 7-trichloroperfluoroheptene-1 (V)、4, 6, 8, 9-tetrachloroperfluorononene-1 (VI) and 4, 6, 8, 10, 11-pentachloroperfluoroundecene-1(VII) compounds were also obtained namely; (VIII) (b. p. 79.8—80.0°/63.7mm, n_D~(22.2°) 1.3642)、(IX) (b. p. 56°/0.17 mm, n_D~(20.5°) 1.3800)、(X) (b. p. 81—82°/0.08 mm, n_D~(20°) 1.3893)、 and (XI) (b. p. 115—116°/0.40 mm, n_D~(20°) 1.3949). The yields ranged between 70% and 80%.The addition of sulfur trioxide to 4, 4-dichloropernuorobutene-1 and 2,3-dichloroperfiuorobutene-2 yielded products of lesser purity. From the same reactions, the formation of products which possibly were the carbyl sulfates of these two butenes were noted. The products obtained from the reaction of sulfur trioxide with 1, 2-dichloroperfluoroethene and perfluoropropene were mixtures.

本文报告三氧化硫和氯三氟乙烯的加合反应,以及由此而得的一衍生物。各种定量分析、化学反应和光谱结果指示最合理结构是一个四员杂环的β-磺内酯(Ia+Ib)。对于这一个衍化物的化学性能,也作了初步的研究。同样的,从液体三氧化硫与4,5-二氯全氟戊烯-1、4,6,7-三氯全氟庚烯-1、4,6,8,9-四氯全氟壬烯-1、4,6,8,10,11-五氯全氟十一烯-1的加合反应产物内,经分馏后也可以得到颇为纯粹的同类衍化物(β-磺内酯),产率为70—80%。4,4-二氯全氟丁烯-1以及2,3-二氯全氟丁烯-2与三氧化硫反应后所得的产物则不甚纯净;1,2-二氯二氟乙烯以及全氟丙烯与三氧化硫的反应产物则更不纯净。

In the presesnt paper, two methods for the determination of rare earth impu-rities ia "purified" cerium are described. (1) The sample to be analyzed is converted into chlorides (concentration 10mg CeO_2/ml and acidity 1: 19 HCl). Transfer a drop of the prepared solution tothe flat top of graphite electrode previously treated with liquid paraffin. The elec-trodes are dried on a hot plate and then excited in an A. C. arc (220 V, 5 Amp).Spectrograph, ISP--51 (with UF-85 autocollimating camera tube). Slit, 0.01...

In the presesnt paper, two methods for the determination of rare earth impu-rities ia "purified" cerium are described. (1) The sample to be analyzed is converted into chlorides (concentration 10mg CeO_2/ml and acidity 1: 19 HCl). Transfer a drop of the prepared solution tothe flat top of graphite electrode previously treated with liquid paraffin. The elec-trodes are dried on a hot plate and then excited in an A. C. arc (220 V, 5 Amp).Spectrograph, ISP--51 (with UF-85 autocollimating camera tube). Slit, 0.01 mm.Photographic plate, NIKFI Ⅱ. Using the line pairs (La 4333.74)/(Ce 4330.90'), (Pr 4225.33)/(Ce 4229.63'), (Nd 4061.09)/(Ce 4057.30) and (Y 4374.94)/(Ce 4376.88')La, Pr, Nd & Y can be determined quantitatively in the concentration ranges0.055--0.62%, 0.089--1.29%, 0.052%--0.59% and 0.025--0.40% respectively. Theroot mean square deviations of single determination amount to ±4.7%, ±10.8%,±7.0% and ±7.0% respectively. (2) For cerium samples of high purity, ether extraction is used to removemost of the cerium so that the rare-earth impurities can be concentrated. Becauseof its relatively simple spectrum, the element Y has been used as carrier and in-ternal standard. The concentrate, also in the form of chloride solution (concentration1 mg rare-earth oxides/ml), is excited and photographed by the same method asmentioned in (1) The line pairs used are: (La 4238.38)/(Y 4235.73'), (La 3988.52)/(Y 3951.60'), (Pr 4222.98)/(Y 4235.73) and (Nd 4232.38)/(Y 4235.73')With a sample of 100 mg (1 mg Y_2O_3 added as internal standard), the analyticalsensitivities reach 0.01%, 0.025% and 0.028% for La, Pr and Nd respectively. Theerror of the method amounts to about ±10%.

本工作报告铈中杂质镧、镨,钕及钇的两种光谱测定方法。(1)将试样的氯化物溶液滴于经液体石腊处理过的碳电极上,干燥后以交流电弧激发进行摄谱。采用线对 La 4333.74/Ce 43330.90,Pr 4225.33/Ce4229.63,Nd 4061.09/Ce 4057.30及Y 4374.94/Ce 4376.88时测定灵敏度分别可达0.055%,0.089%,0.052%,0.025%。单次摄谱的均方误差分别为±4.7%,±10.8%,±7.0%及±7.0%。 (2)对于较纯的铈,则采用乙醚萃取先行分离,以浓缩其中所含的杂质,并采用谱线较少的元素钇作内标及载体,以补偿分离过程中损失。浓缩物仍以氯化物溶液状态用上述的激发方法进行摄谱。采用下列线对: La 4238.38/Y 4235.73,La 3988.52/Y 3951.60,Pr 4222.98/Y 4235.73,Nd 4232.38/Y 4235.73取样100毫克时,镧、镨及钕的测定灵敏度分别可达0,01%;0.025%及0.028%。一般误差约在±10%左右。

Design data for high purity toluene recovery from platformate by extractive distillation with phenol, were obtained by a pilot plant study. The extractive distillalations column, 200mm in diameter, possessed 44 bubble cap plates and had a Capacity o?processing 250 kilograms of feed per day. The platformate was first prefractionated to 70-117℃, which contained 0.8% benzene and 48% toluene by weight. The heart cut was then used as the feed for the extractive distillation. The recommended operating conditions...

Design data for high purity toluene recovery from platformate by extractive distillation with phenol, were obtained by a pilot plant study. The extractive distillalations column, 200mm in diameter, possessed 44 bubble cap plates and had a Capacity o?processing 250 kilograms of feed per day. The platformate was first prefractionated to 70-117℃, which contained 0.8% benzene and 48% toluene by weight. The heart cut was then used as the feed for the extractive distillation. The recommended operating conditions were as follows: phenol/feed ratio, 4; reflux ratio, 4-5; feed temperature, 120℃; phenol inlet temperature, 130℃. The actual plates of rectifying, stripping and phenol recovery section were 19, 20 and 5 respectively. The recovery of nitration grade toluene from the feed was 97-98%. When losses in prefractionation, acid washing and redistillation were included, the net recovery of toluene from the platformate was 93%. The result of this study gave the data for designing of full scale production plants.

为了提供以苯酚为溶剂用抽提蒸馏法从铂重整生成油中抽取纯甲苯的工业装置设计依据和操作条件,进行了日处理量为250公斤的中型试验。抽提蒸馏塔为一直径200毫米,拥有44个塔盘的泡帽塔。铂重整生成油先经预分馏切割成70—119℃馏份,其中苯含量为0.8%(重量),甲苯含量为48%(重量)。然后将该馏分进行抽提蒸馏,合理操作条件为酚油比4:1(体积比);回流比4.5;油进口温度120℃;酚进口温度130℃。精馏段塔盘数为19,汽提段塔盘数为20,酚回收段塔盘数为5。产品经酸碱洗涤和再蒸馏后为硝化级纯度的甲苯,抽提蒸馏的甲苯收率可达97—98%(重量)。如包括预分馏损失,则甲苯的收率为96%(重量)。酸碱洗涤和再蒸馏损失一般可按3%计,因此,纯甲苯净收率为93%(重量)。试验结果提供了工业装置的设计数据。

 
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