查询词典 titanium

The effect of ceria and titanium dioxide on photocatalytic degradation of phenol waste water had been compared. It showed that ceria excelled at the removal of phenol than titanium dioxide.

比较了二氧化铈和二氧化钛对苯酚废水光催化降解的效果，二氧化铈对苯酚的去除率优于二氧化钛。

These dendritic NOBIN derived Schiff base ligands have been applied to titanium catalyzed hetero-Diels-Alder reaction of Danishefshy's diene and aldehydes, affording the corresponding 2-substituted 2, 3-dihydro-4H-pyran-4-one in quantitative yields and excellent enantioselectivities (up to 97. 2%ee). Comparing the reactivities and enantioselectivities of reaction catalyzed by the titanium complexes of these Schiff base ligands, it was found that a series of ligands L〓 were superior to the other three series of ligands L〓, L〓 and L〓, a significant positive NLE and a dendrimer effect existed in the L〓 dendritic catalyst system. The disposition of the dendritic wedges and the dendron size in the ligands were observed to have a significant impact on the enantioselectivity of the reaction.

NOBIN衍生的树枝状大分子希夫碱手性配体与钛形成的配合物在催化不对称杂Diels-Alder反应中的应用将得到的四个系列NOBIN衍生的树枝状希夫碱三齿手性配体与四异丙氧基钛形成的配合物用于催化Danishefsky's diene与醛的不对称杂Diels-Alder反应，通过反应条件的优化，获得了定量的收率和最高达97.2％ee值的对映选择性；考察了这四个系列NOBIN衍生的树枝状希夫碱钛配合物的催化活性和对映选择性，结果发现它们的活性次序依次为L〓≈L〓＞L〓＞L〓，对映选择性次序依次为L〓＞L〓＞L〓＞L〓。

P-t curves of titanium hydride and titanium deuteride desorbing hydrogen and deuterium are investigated at 350～550 ℃ by using the method of reaction rate analysis in a constant volume system.

在高真空金属系统上测定了氢化钛和氘化钛在恒容体系中、350~550℃温度下热解吸氢和氘的P-t曲线；应用反应速率分析方法计算了各自在不同温度下的反应速率常数，得到氢化钛和氘化钛热解吸的表观活化能分别为27。

Those results make basis for fabricating discontinuously reinforced titanium matrix composites with high properties and broadening the application area of discontinuously reinforced titanium matrix composites.

这些研究为以后制备高性能的钛基复合材料和拓展钛基复合材料的应用领域打下了坚实的理论基础和为批量生成提供了实用途径。

Titanium or titanium alloy is of nice histocompatibility, which raised the success rate of subgingival false tooth because of little irritation.

钛或钛合金具有良好的组织相容性，对牙龈刺激小，可以增加龈下义齿的成功率。

Based on the features of Panzhihua titanium concentrate,the reasons why titanium recovery is low and aluminum consumption is high when ferrotitanium is smelted in alumino-thermic process were analyzed.

结合攀枝花钛精矿的特点，探讨了采用铝热法冶炼钛铁时钛回收率低、铝耗量高的原因，并提出了相应的解决措施。

Professional manufacturing: electrical circuit board Flashboard frame heat pipe, titanium heating tube, Teflon heaters, precision oven, circuit board hanging tool, circuit board tunnel furnace, SMT equipment, titanium blue.

专业生产制造：电线路板插板架热管、钛加热管、铁氟龙加热器、精密电烤箱、电路板挂具、电路板遂道炉、SMT设备、钛蓝。

Up to now, there is not any intact method which can quantificationally extract and analyze the soluble titanium in soil and fractionate titanium forms.

因此，研究土壤中钛的分级测定，对钛在土壤中的行为和肥力特征都具有重大意义。

Galvanization: 1st, pure titanium series, 2, beta titanium series: The A.

电镀： 1、纯钛系列、2、β钛系列： A。

Our Company is a professional manufacturer in producing precise screw,nut,thread,gasket,nail,hardware accessories,titanium jig of glasses,titanium gemel,ctc.

兴兴达公司是一家专业生产制造精密螺丝、螺母、丝通、垫片、钉子、精密五金配件及眼镜夹口、钛铰链为主的制造商。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。