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    Determination of Palladium and Rhodium and Impurities in Platinum Gauze by ICP-AES Minus Equivalent Concentration Method
    ICP-AES等效浓度差减法测定铂网中的钯铑及杂质元素
    SiO2,the main component of quartz sand,is usually determined by HF-H2SO4.Through this way we eliminated the silicon,and then weighed the impurities after being sintered at 800℃.
    测定石英砂中SiO2的含量时,通常先用HF-H2SO4处理,使硅逸去,然后在800℃下灼烧、称重,利用差减法计算。
    Results showed that the grain yield of rice with combining application of N, P, K or combination of chemical fertilizer and organic manure could maintain approximately 6 000 kg hm-2. N recovery (difference method) in the two treatments averaged from 42%~49%. As compared with those treatments of lacking a certain element, its grain yield increased by 30%~40% and N recovery increased by 10%~20%.
    研究结果表明:氮肥与磷、钾肥配合,化肥与有机肥配施两个处理的稻谷产量稳定在6000 kg hm-2左右,氮肥利用率(差减法)平均为42%~49%,比缺少某一元素处理,增加产量30%~40%,氮肥利用率提高10~20个百分点。
    A STUDY ON THE ACCURATE METHOD OF DETERMINING THE COPPER CONTENT IN SALT OF COPPER BY THE EDTA IN THE MINUS WAY
    EDTA差减法准确测定铜盐中铜含量方法的研究
    RE were 59%, 26%, and 24% determined by 15N dilution method when FN applied at PI, MT and basal, and which were 67%, 54%, and 45% estimating by 'difference method' respectively;
    在热带地区,~(15)N示踪法测定的水稻对幼穗分化期追肥的的吸收利用率为59%,对分蘖期追肥和基肥的吸收利用率分别为26%和24%,差减法测定值分别为67%、54%和45%;
    According to difference method, the "true" volume of the physical models were measured, which was 13260cm3 and regarded as the analysis foundation of the precision of the volume that was calculate by DEM.
    根据体积差减法测量实体模型的体积作为数据精度分析的体积“真值”,该值为13260cm~3,作为采用DEM进行体积计算的基准值;
    In the cotton harvest time, sampling to analyze, according to the subtraction counts nitrogen fertilizer utilization is 48.58%~53.15% in the cotton with drip irrigation, utilization of phosphorus is 18.73%~24.84%.
    收获期棉株取样化验分析,根据差减法求得滴灌棉花氮肥利用率为48.58%~53.15%,磷肥利用率为18.73%~24.84%。
    The actual lithium contents obtained by method of difference have been compared with that of control samples contaning Li_2O<0.11%, the absolute deviation is found to be less than . 03%.
    用差减法所得真实鋰含量与管理矿样比较,其耙对誤差(当Li_2O%小于0.11%时)小于+0.03%
    As(V) was evaluated by difference.
    以差减法求得As(V)含量。
    The Raman spectra of UO_2~(2+), Th~(4+), Nd~(3+)--TTA Complexes and theiradducts with TBP or TOPO was studied. The influence of the solvent-benzeneon the spectra can be avoided by substracting benzene spectrum from that of thecomplexes or adducts mentioned above.
    本文测定了UO_2~(2+),Th~(4+),Nd~(3+)—TTA络合物和它们与TBP,TOPO协萃化物在苯溶液中的拉暑光谱,采用差减法消除了溶剂苯对光谱的影响,并对给出的光谱进行了辩认和讨论。
    The total Cr was determinated under same conditions after the sample was treated with basic KMnO4,and the concentration of Cr(Ⅲ) was finally obtained by taking a difference.
    将试样经碱性KMnO_4法氧化处理后,在相同条件和系统中测定总铬,用差减法得到Cr(Ⅲ)含量。
    The other is used for the determination of total Sb amount by selective hydrolysis of Sb at pH 1.0-1.5 to separate Sb from foreign ions. The amount of Sb (Ⅴ) is calculated by deduction.
    另一份试液在pH1.0~1.5使锑离子水解与干扰离子分离,测定总锑量,用差减法求出Sb(Ⅴ)含量。
    Hg22+was oxidized HG2+by KMnO4 solution and determined Hg22+ and Hg2+. At last,counted Hg、Hg22+Hg2+ Content of the Sample by means of Sbutraction.
    另一份用高锰酸钾氧化Hg22+为Hg2+,测定Hg22+、Hg2+含量,然后用差减法求出Hg、Hg22+和Hg2+的含量。
    Asparagus bean absorbed 48. 6% of P2O5, 21. 7% of N and 28. 0% of K2O from soil, others were supplemented by fertilizing and root nodule bacterium.
    据差减法计算,豇豆吸收N的46.8%、P2O5的21.7%、K2O的28%来自于土壤,其余养分则由施肥及根瘤菌作用补充。
    but above 20 mg/L, the interferences on fluorologging can be over-comed by minusing modified asphalt fluorescence intensity.
    当污染高于20mg/L时,用荧光强度差减法可以消除钻井液污染造成的那部分荧光干扰;
    The Se() and organic Se are determined by difference after reduction of the Se() with HCl and digestion of the organic Se with HNO3HClO4,respectively.
    利用盐酸还原硒(Ⅵ)和HNO3-HClO4消化有机硒后,用差减法分别测出硒(Ⅵ)和有机硒。
    Cr(Ⅵ) was extracted and measured from pH4.5 buffer solution with APDC_MIBK extraction system. Cr(Ⅲ) was calculated by subtraction method.
    以APDC_MIBK为萃取体系 ,在 pH为 4 .5的缓冲溶液中萃取测定铬 (Ⅵ ) ,以差减法求铬 (Ⅲ ) .
    Determination of Fe 2O 3, Al 2O 3, CaO, MgO, MnO 2, NiO, TiO 2 with emission spectrum method and determination of K 2O, Na 2O with flame photometric method were studied. The content of SiO 2 was got by difference method.
    本文研究了发射光谱法测定Fe2 O3 、Al2 O3 、CaO、MgO、MnO、NiO、TiO2 和火焰光度法测定K2 O、Na2 O ,然后以差减法得出SiO2 含量。
    A new system for spectrophotometric simultaneous determination of copper and cobalt with 5(5nitro2pyridylazo)2,4diaminotoluene(5NO2PADAT) has been developed,which is based on the different stabilities between Cu*!
    基于Cu ,Co 与5 (5 硝基 2 吡啶偶氮) 2,4 二氨基甲苯(简称5 NO2 PADAT)在弱酸性介质中均可发生灵敏的显色反应,但铜络合物可被EDTA或强酸分解,而钴络合物不被分解的特点,利用差减法建立了铜、钴同时测定的新方法。
    A new method for simultaneous spectrophotometric determination of Zinc(Ⅱ) and Copper(Ⅱ) with 3,5-diCl-DMPAP in the presence of OP was studied.
    研究了在乳化剂OP存在下,以2 (3,5 二氯 2 吡啶偶氮) 5 二甲氨基酚(3,5 diCl DMPAP)为显色剂使铜和锌同时显色,再以硫脲 硫代硫酸钠掩蔽铜,利用两次所测吸光度之差以差减法同时测定铜、锌。
 

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