查询词典 yttrium

The research was mainly based on the formation condition of crystalline ammonium yttrium carbonate and the variation characteristics of pH value during the crystallization in which NH4HCO3 was used to precipitate yttrium ion.

对碳酸氢铵沉淀钇时碳酸钇铵复盐结晶的形成条件与pH变化特征进行了研究，发现其结晶过程与平衡溶液pH有对应关系。

The external scale of cobalt sulfide and yttrium oxide-surfide particles in the inner scale were found respectively after corrasion in Pa .!$+ lo-'' Pa Q. Beneath the external scale, a region of internal sulfidation-oxidation of yttrium was also present. The comion pduct in lo-' Pa .!$+ 10-l5 Pa Q was only a very thin surface layer of yttrium oxysulfide and an internal oxidation zone of yttrium.

并有助于降低纯Co的腐蚀速率，10＾02Pa硫压下，合金表面形成的腐蚀产物为多层、以为硫化钴，中间层为由两金属化合物怕成分复杂的混合物层，最内层是由氧和硫引起的Y的内腐蚀区；在10＾－3Pa硫压下，合金没有形成外层硫钴，仅在表面形成较薄的Y的硫氧化物，其下为Y的内氧化区。

In the presence of yttrium, lutetium and gadolinium, the fluorescence intensity of the system Eu-SPLX-SDS was enhanced about 5-fold, 5-fold and 4-fold compared with that of the system without yttrium, lutetium and gadolinium.

在确定的最佳实验条件下，铕-SPLX-phen-SDS，铕-SPLX-SDS配位体增敏荧光体系和铕-钇-SPLX-SDS稀土元素共发光体系的荧光强度同铕的浓度分别在5.0×10〓～1.0×10〓mol/L，5.0×10〓～1.0×10〓mol/L，5.0×10〓～5.0×10〓mol/L，1.0×10〓～5.0×10〓mol/L和5.0×10〓～1.0×10〓mol/L范围内呈良好的线性关系，稀土元素铕的检测限分别为1.0×10〓mol/L，7.0×10〓mol/L，1.0×10〓mol/L，2.0×10〓mol/L和4.0×10〓mol/L。

The effect of misch metal and yttrium on the ageing behavior of AZ91 magnesium alloy was investigated.Aluminum compounds of rare earth and yttrium with high melting point were crystallized fiirstly from the melt alloy during the solidifying process and pushed to the crystalllizing face of α phase to inhibit its growing,or became the nucleation of the matrix.

在AZ91镁合金中添加稀土和钇之后，高熔点的铝稀土化合物和铝钇化合物在凝固过程中首先结晶析出，并成为基体相的形核中心，或者被推移到初生α相结晶前沿，阻碍α相的生长，使其铸态组织得到细化。

This dissertation involves the study of the growth dynamics of colloidal particles under unequilibrium and irreversibility condition. Firstly, it is of interest to investigate whether the ideal diffusion or reaction-limited aggregation universal behavior can be observed for the initially polydisperse practical system of basic yttrium carbonate as well. The fractal structure of basic yttrium carbonate aggregate cluster was observed using transmission eletron microscopy. The aggregation kinetics of basic yttrium carbonate colloids was studed using dynamic 1ight-scattering techniques. At 1.00mol/l NaCl solution the fast diffusion-limited aggregation behavior was observed with an increase in the aggregate size over time described by a power law. The aggregates are characterized by a fractal dimension D=1.82. The disordered and ramified cluster is consisted of primary colloidal particles and tenuous and more open. These are in good agreement with those observed for other colloidal system such as colloidal gold (1.86), silica (1.85) and polystyrene latex (1.82) in diffusion-limited aggregation from the static and dynamic light scattering by Lin. Therefore ideal diffusion-limited aggregation behavior can be observed in practical polydisperse system as well. Smoluchwski and fractal theories were used to obtain the aggregation rate constant for initially polydisperse system for the first time.

本论文研究胶粒的非平衡不可逆聚集动态学，分为两个部分，第一部分是通过实验研究一个新的初始多分散的碱式碳酸钇胶粒实际体系中，聚集标度性质的普适性，即使用透射电子显微技术观测聚集粒子簇的分形结构，使用动态激光光散射研究碱式碳酸钇胶粒的聚集动力学，胶粒带电而产生静电排斥作用使得碱式碳酸钇胶粒处于稳定状态，当加入电解质NaCl溶液时，碱式碳酸钇胶粒间的Debye-Hückel屏蔽距离缩短，从而降低静电排斥能垒，引起胶粒发生不可逆聚集，加入电解质NaCl的浓度为1.00mol/l时，碱式碳酸钇胶粒进行快速聚集，经历扩散控制聚集机理，形成结构疏松、更为开放的分形聚集粒子簇，其分形维数为1.82，碱式碳酸钇胶粒聚集增长动力学遵循幂函数增长规律，与Lin等使用静态激光光散射和动态激光光散射测量硅胶(1.85)、金胶(1.86)和聚苯乙烯胶乳(1.82)在扩散控制聚集状态形成聚集粒子簇的分形维数值以及粒子簇聚集增长的动力学规律相一致，表明胶粒聚集标度性质的普适性质在初始多分散的实际体系中也是存在的，首次由动态激光光散射的实验数据得到初始多分散胶粒分形粒子簇的聚集速率常数，并且其值与Smoluchowski聚集速率理论预期相符。

The corrosion product in 10-3 Pa S2 + 10-15 Pa O 2 was only a very thin surface layer of yttrium oxysulfide and an internal oxi dation zone of yttrium.

在10-3 Pa硫压下，合金没有形成外层硫化钴，仅在表面形成较薄的Y的硫氧化物，其下为Y的内氧化区。

The article considers that the magnetic material layer of MPCs is bismuth-substituted yttrium iron garnet which is ferromagnetic material, and the isotropic material layers are GGG, GaAs, SiO2, etc. Those materials have different relative permittivities.

文中所模拟的磁性光子晶体，其主要磁性层为亚铁磁性材料的渗入铋之钇铁石镏石(Yttrium Iron Garnet， YIG，)，而等向性介质则采用、GaAs等材料，其分别具有不同的相对介电常数。

The main contents and conclusions are as follows:(1) Synthesis of 1,6-hexamethylenedicarbamate catalyzed by yttrium nitrate Yttrium nitrate was employed as the catalyst in the synthesis of 1,6-hexamethylenedicarbamate from alkyl carbamates.

主要内容和结论如下：(1)硝酸钇为催化剂合成1，6-己二氨基甲酸酯采用硝酸钇作为小分子氨基甲酸烷基酯和1，6-己二胺合成1，6-己二氨基甲酸酯的催化剂。

In order to increase the peak depth of nitrogen atoms during the nitrogen plasma ion implantation of Ti-6Al-4V alloy, the rare earth metal yttrium was used to increase the implantation and diffusion depth of nitrogen atoms. In the experiment, the yttrium ions were implanted under the voltage of 20 kV firstly, and then the nitrogen ions were implanted under 30 kV.

为了提高氮离子体浸没离子注入Ti-6Al-4V合金时氮原子的峰值深度，利用钇来增加氮在基体中的注入深度和扩散深度，先用20 kV的电压进行钇离子体浸没离子注入处理，然后用30 kV的电压进行氮离子体浸没离子注入处理。

WANG Lang-ping, TANG Bao-yin, WANG Xiao-feng, WANG Song-yan, LIU Ai-guo, TIAN Xiu-bo (National Key Laboratory of Advanced Welding Production and Technology, Harbin Institute of Technology, Harbin 150001, China)Abstract: In order to increase the peak depth of nitrogen atoms during the nitrogen plasma ion implantation of Ti-6Al-4V alloy, the rare earth metal yttrium was used to increase the implantation and diffusion depth of nitrogen atoms. In the experiment, the yttrium ions were implanted under the voltage of 20 kV firstly, and then the nitrogen ions were implanted under 30 kV.

为了提高氮等离子体浸没离子注入Ti-6Al-4V合金时氮原子的峰值深度，利用钇来增加氮在基体中的注入深度和扩散深度，先用20 kV的电压进行钇等离子体浸没离子注入处理，然后用30 kV的电压进行氮等离子体浸没离子注入处理。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。