查询词典 selectivity

The study and development of floatation column from the beginning to the end has never departed from its advantage of good selectivity.

浮选柱的研究与开发始终没有离开其选择性好的优势。

Under the optimal reaction conditions of 0.5MPa pressure, at 150℃, H2 gas flow rate of 5000 mLh^(-1) and liquid flow rate of 5.0mLh^(-1), the conversion of furoic acid, selectivity to methyl tetra-hydro-furan formiate and yield of methyl tetra-hydro-furan formiate can reach 99.0%, 98.2% and 97.2%, respectively.

结果表明：在0.5MPa，150℃，氢气流速5000mLh^(-1)，液体流速5.0mLh^(-1)（氢油比为50）时，呋喃甲酸转化率为99.0%，四氢糠酸甲酯的选择性98.2%，产率97.2%。

It is found that conversion of furfuryl alcohol was higher than 99%,and THFA yield and selectivity achieved or were close to 97%by using catalyst Ⅱ with a small quantity of promoters.

对于含少量助剂的镍催化剂Ⅱ，在393 K、4.0 MPa和空速0.25 h\+\{-1\}时，糠醇转化率可达99%以上，四氢糠醇收率和选择性都达到或接近97%。

The THFA yield and selectivity were 2.0%higher than those by using catalyst Ⅰ without promoter,3.0%higher than those by using Raney nickel catalyst under the same reaction conditions and furfuryl alcohol conversion.

在相同反应条件和糠醇转化率条件下，四氢糠醇收率和选择性均比没有助剂的镍催化剂Ⅰ高2.0%，比骨架镍催化剂高3.0%。

Amorphous alloys represent a variety of special materials with short-range ordering while long-range disordering structure which may provide pathways to the excellent catalytic properties, i.e., good anti-poisoning ability, the higher catalytic activity and selectivity in homogeneous hydrogenation of a,p-unsaturated aldehyde, the low and even none environment pollutionUp to now, in hydrogenation of furfural to furfuryl alcohol, the most commonly used catalysts are Cu-Cr dopant Cu-Cr, and Raney Ni et al.

目前，在糠醛催化加氢反应中所用的催化剂主要有Cu-Cr和修饰的Cu-Cr以及Raney Ni等，Cu-Cr催化剂毒性较高，对环境构成严重的危害，而且易阻塞反应器。

The total yield of glucuronic acid and glucuronolactone reached 60% at optimum conditions, and the catalyst had good selectivity.

在Pd负载量为1%、温度70 ℃、pH值为9的条件下，葡萄糖醛酸及内酯的总收率达到60%，反应选择性良好。

The results showed that V_2O_5/C catalyst exhibited obvious activity for glyoxal oxidation and high selectivity of glyoxylic acid.

在确定了催化体系中氧化产物的基础上，建立了比值导数波谱法同时分析乙二醛和乙醛酸，该法为乙二醛催化氧化过程的实时、快速分析提供了新的手段。

The distribution coefficient of oxalic acid was larger than that of glyoxylic acid,and both of them decreased with the pH. The selectivity of oxalic acid to glyoxylic acid also decreased with pH.

在本实验的条件范围内，草酸的分配系数较乙醛酸大，且随溶液pH值的增大而下降，草酸对乙醛酸的分离系数随pH值的增大而减小。

Methods 30 patients with various kinds of uterus tumor and postpartum hemorrhea were treated with uterus arterial embolism with PVA microparticle whose diameter was 300～500 μm, iodized oil emulsion and/or gelatin sponge stick through super-selectivity unilateral or bilateral uterus arte.

方法对30例各类子宫肿瘤和产后大出血患者，通过超选择性双侧或单侧子宫动脉插管，用直径300~500μm的PVA微粒、碘油乳剂和/或明胶海绵条将子宫动脉栓塞。

However, the selectivity in bmimPF6 for 2-heptanone is much higher than those in acidic aqueous solution and in heptene (solvent-free).

在离子液体bmimPF6中，2-庚酮的选择性高于无溶剂和酸性水溶液中的结果。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。