查询词典 ni

The effect of zeolites ion-exchanged by transition metals on thermal catalytic cracking reaction is studied. The product distributions of the cracking reactions catalyzed by theβor ZSM-5 zeolites exchanged with transition metals are different from that catalyzed by corresponding Hzeolites, which means the mechanism of cracking reactions has varied. Group Ⅷ metals Fe, Co, Ni and Cu, Zn are shown to be of strong catalytic activity of oxidative dehydrogenation, while Ti and Cr are not of oxidative activity. Catalyzed by zeolites or catalyst containing Ag, conversion of thermal catalytic cracking reactions and the yield of ethylene increase while the yield of propylene does not decrease. Silver can not only promote the formation of carbonium ion, but also convert carbonium ion into free-radical via redox reaction. The weak adsorption of olefins on silver reduces the occurrence of hydrogen transfer and dehydrogenation. As a result, the yield of light olefins is favored by silver in the catalyst.

采用过渡金属交换的分子筛作为催化剂，进行催化热裂解制取乙烯的反应，研究发现，在β沸石分子筛和ZSM-5分子筛中引入过渡金属后，催化热裂解反应的产物分布与相应的氢型分子筛相比有了较大的变化，说明过渡金属的加入对于催化热裂解反应的机理具有影响，Ⅷ族金属如Fe、Co、Ni和第Ⅰ、Ⅱ副族Cu、Zn表现出较强的氧化脱氢活性，产物中氢气、焦炭的产率很高，Ti、Cr则未表现出氧化作用：分子筛及催化剂中引入银后，催化热裂解反应的转化率和乙烯的产率有了提高，丙烯产率没有很大的变化，说明银在催化热裂解反应中能够促进正碳离子的生成，又有可能通过氧化-还原作用部分改变反应机理，促进了自由基的生成，并且由于银对烯烃的吸附很弱，其氢转移反应和脱氢、加氢活性比较低，有利于烯烃产率的提高。

The results of experiment are summarized as follows: The 24h-LC_(50) of Ni、 Hg and PCP to Chironomus plumosus Larva are 5.7g/L, 3.54μg/L、0.11mg/L, respectively ; The 48h-LC_(50) are 1.4g/L、2.64μg/L、 0.09mg/L, respectively.

实验结果简述如下： Ni、Hg和五氯酚对羽摇蚊幼虫24h-LC_(50)和48h-LC_(50)分别为5.7g／L、1.4g／L；3.54mg／L、2.64mg／L和0.11mg／L、0.09mg／L。

Compared with the casing of permanent magnetic material Al-Ni-Co and permanent magnetic Ferrite, NdFeB has stronger coactivity andmax; which can attract heavy objects weighing over six hundred and forty pounds times its weight.

相对于Al-Ni-Co系永磁和铁氧体永磁材料，钕铁硼具有极高的磁能积和娇顽力，理论上可等于自身重量的640倍重物。

Compared with the casing of permanent magnetic material Al-Ni-Co and permanent magnetic Ferrite, NdFeB has stronger coactivity andmax; which can attract heavy objects weighing over six hundred and forty pounds times its weight.

相对于Al-Ni-Co系永磁和铁氧体永磁材料，钕铁硼具有极高的磁能积和娇顽力，理论上可等于自身重量的640倍重物。高能量密度的优点使钕铁硼永磁材料在现代工业和电子技术中获得了广泛应用。

The content of major elements, such as Fe, Mg, Ca and Al, and trace elements, such as Ti, Sr, Ni, Cr and Co, is linearly correlated to that of SiO2, which suggests that the different volcanic rocks in the basin should be the product of fractional crystallization of congenetic magmas. The parental magma may be generated by the partial melting of an enriched mantle wedge formed by the metasomatism of slab-derived fluids in an active continental margin tectonic setting.

FeO、MgO、CaO、Al2O3、TiO2等主元素和Sr、Ni、Cr、Co等微量元素的含量与SiO2含量呈明显的线性相关关系，表明该区火山岩可能是同源岩浆分异的产物，岩石形成於活动大陆边缘的构造环境，并由遭受消减板块流体交代的富集地幔楔部分熔融而形成。

Ni, W., S. Crain, and D.

Ni， W。， S。 Crain与 D。

Compared to the hydrogen storage material 70Mg30C and MgH2, the crystallitic carbon and the catalysts of Ni and Al cut down the dehydrogenation time, increased the dehydrogenation capacity of hydrogen storage material, and reduced its apparent activation energy. And the dehydrogenation kinetics performance was improved.

与储氢材料70Mg30C及纯MgH2相比，微晶碳和催化剂Ni、Al缩短了储氢材料的放氢时间，加快了放氢速度，提高了放氢量，降低了表观活化能，放氢动力学性能得到了改善。

The fatigue cracking in Ni〓Al SC at room temperature is characterized by the stage Ⅰ crystallographic cracking.

在室温下，Ni〓Al单晶体中的疲劳开裂是第一阶段性质的晶体学开裂。

Three isomorphic pendant derivatives based on monovacant Keggin heteropolytungstate [SiW11O39]8- as building block have been synthesized through the decoration of Co-Im complexes using bench method:5Na_4H_2[SiW_(11)O_(39)CoIm]_(0.63)[SiW_(11)O_(39)Co(H_2O)]_(0.37)·7H_2O (1)_6[SiW_(11)O_(39)NiIm]_(0.8)[SiW_(11)O_(39)Ni(H_2O)]_(0.2)·7H_2O (2)_4Na_6[SiW_(11)O_(39)MnIm]_(0.69)[SiW_(11)O_(39)Mn(H_2O)]_(0.31)·7.5H_2O (3) Complexes 1–3 are the first examples of crystallographically characterized 3d-transition metal mono-substituted POMs with an antenna organic ligand synthesized under normal bench conditions.

以单缺位Keggin型杂多钨硅酸盐[SiW11O39]8-为建筑单元，在水溶液中通过过渡金属-咪唑配合物的修饰，成功地获得了三个同构的悬臂式衍生物：5Na_4H_2[SiW_(11)O_(39)CoIm]_(0.63)[SiW_(11)O_(39)Co(H_2O)]_(0.37)·7H_2O (1)_6[SiW_(11)O_(39)NiIm]_(0.8)[SiW_(11)O_(39)Ni(H_2O)]_(0.2)·7H_2O (2)_4Na_6[SiW_(11)O_(39)MnIm]_(0.69)[SiW_(11)O_(39)Mn(H_2O)]_(0.31)·7.5H_2O (3)它们是第一例在常规水溶液条件下合成得到的X-射线表征的3d-过渡金属取代的悬臂式多酸衍生物。

The influence of dopants Ti and Ni on the dehydrogenation properties of NaAlH4 was studied by means of first principles.

利用第一性原理方法研究了掺杂元素Ti， Ni对NaAlH4放氢性能的影响。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷