选择性的

The inventive has excellent activity of diolefin hydrogenation and selectivity, sulfur resistance and arsenic resistence, extremely excellent pyrolysis gasoline selective hydrogenation performance, can meet the process requirements of pyrolysis gasoline selective hydrogenation.

本发明的催化剂具有优异的双烯加氢活性和选择性，以及抗硫和抗砷能力，具有十分优异的裂解汽油选择性加氢性能，能够适应裂解汽油选择性加氢的工艺要求。

This paper provides a comprehensive review and critical analysis on the different reaction pathways for catalytic conversion of glycerol into commodity chemicals, including selective oxidation, selective hydrogenolysis, selective dehydration, pyrolysis and gasification, steam reforming, thermal reduction into syngas, selective transesterification, selective etherification, oligomerization and polymerization, and conversion of glycerol into glycerol carbonate.

本文提供了一个全面的审查和批判性分析的不同的反应途径甘油催化转化成商品的化学品，包括选择性氧化，选择性氢解，选择性脱水，热解气化，重整，热还原成合成气，选择交换，选择性醚化，齐聚和聚合，并转换成甘油甘油碳酸盐。

Six hundred and forty-two patients (aged 10 months to 37 years) were treated with combined operations of different operations, including traditional operations on soft tissue release, osteotomy, selective posterior rhizotomy, selective rhizotomy and converse anastomosis, neurectomy, etc. The follow-up period ranged from 6 months to 4 years (mean 18 months).

方法］应用传统的软组织松解延长手术、截骨手术、选择性脊神经后根切断术、脊神经后根选择性切断逆向吻合术，以及选择性周围神经切断等手术，对642例年龄在10个月～37岁的脑瘫病人采用不同的手术组合治疗，随访6个月～4年，平均18个月。

Whenpyridine was used as reductive decomposing agent, the expecting cholest-4-en-3,6-dione-22-al was obtained. However, when Zn/HOAc was used to decomposethe ozonide, C-4,5 double bond was further reduced to give cholest-3,6-dione-22-al as main product. 2 For the side-chain construction of compound (1), the solid-liquid phase-transfer Wittig reaction was used. When (3-methyl-2-oxobutyl)-triphenylarsonium bromide was used as reagent, the reaction can be carried out inmild reaction condition and the yield is higher than that when phosphorane wasused.

但使用Zn／HOAc作为分解剂时，却得到其氢化产物胆甾-3， 6-二酮-22-醛；2在甾体支链引入过程中，采用固-液相转移Wittig反应的方法，用(3-甲基)-2-氧丁基三苯基溴化胂作为试剂，反应在非常温和的条件下便可完成，而且产率比传统采用膦烷的方法更高；3在对某些甾酮化合物的选择性还原反应研究时，发现在〓还原体系中，当加入某些金属离子后，反应有更好的区域选择性和立体选择性。

At the heavy metal concentration of 3-4ppm, our study on adsorption capacity, adsorption selectivity of montmorillonite, illite and kaolinite to Cu〓、 Pb〓、 Zn〓、 Cd〓、 Cr〓 shows that the adsorption capacity is mainly determined by the capacity of exchangeable cations and the adsorption capacity of the three clay minerals decreases in this sequence: montmorillonite ＞＞ illite＞kaolinite. It is found that clay minerals have obvious adsorption selectivity to various heavy metals. Montmorillonite exhibits a stronger affinity to Cr〓 and Cu〓 while kaolinite and illite sorb Cr〓 and Pb〓 more effectively. At the same heavy metal concentration, adsorption amount of clay minerals to heavy metals increase with increasing pH value of the solution.

在痕量浓度下，研究了蒙脱石、伊利石、高岭石三种粘土矿物对Cu〓、Pb〓、Zn〓、Cd〓、Cr〓五种重金属离子的吸附容量、吸附选择性及其介质条件对吸附量的影响，结果表明，粘土矿物的阳离子交换容量越大，对重金属离子的吸附容量也越大，其大小顺序为蒙脱石＞＞伊利石＞高岭石；同时，不同粘土矿物对重金属离子具有明显的吸附选择性，蒙脱石对Cr〓和Cu〓有较好的选择性，伊利石和高岭石则对Cr〓和Pb〓有较好的选择性；随着吸附溶液pH值的增大，其吸附量有增加的趋势。

In a tritrophic system,the acceptability and suitability of five kinds of plants by Cyrtopeltis tenuis Reuter were observed in the laboratory under no-choice and choice situations,respectively.The results from choice experiments with C.tenuis adults showed that there were no significant differences among plant and pest systems except cole+aphids.

在温室内采用笼罩观察，通过选择性和非选择性试验，在两营养级的基础上进一步研究了三营养级体系中烟盲蝽对5种不同植物种类的选择性。

D. of the catalyst increased, i. e. the acid volume of the catalyst increased, the conversion for isobutene and the selectivity for trimer increased also, while the selectivity for dimer decreased, and the selectivity for tetramer was almost unchanged.

D。增加时，即催化剂的酸量增加时，异丁烯的转化率和三聚物的选择性也增加，但二聚物的选择性降低，四聚物的选择性则几乎没有变化。

Its very difficult to support metal on the surface of crude CNTs. Compared with Pt/C,Pt/CNTs have higher performances in term of efficiency and selectivity. It can be concluded that the interaction between metal and CNTs favors both the high activity and selectivity in cinnamaldehyde hydrogenation.

Pt/CNTs在选择性肉桂醛的选择性加氢中表现出很高的加氢活性和选择性，这是由于纳米碳管外表面独特的结构以及纳米碳管和金属之间相互作用的结果。

Palladium loadings of 1.39%, 3.0%, and 5.85% showed high activity and selectivity in the Heck coupling of iodobenzene with styrene (conversions of 76-84%, selectivities of 84-87%) and methyl acrylate (89-100% conversions and 100% selectivities).

钯全部1.39%、3.0%、和5.85%的表现高活性、选择性与苯乙烯啥米耦合碘(1976年至1984年改建成选择性84-87%)和甲基丙烯酸(89-100转换成选择性和100%)。

Advances in ethylene selective trimerization catalysts, especially composition, activity and cost of trimerization catalysts and their overall selectivity to 1-hexene.

对乙烯选择性三聚反应进行了论述，着重分析了催化剂的组成、活性、成本和1-己烯的总选择性，并展望了烯烃选择性齐聚反应的发展。

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％。