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The results show t hat yttrium exists as the form of compound (Al2Y) in AZ31 magnesium alloy, and dystectic Al2Y as the heteromorphic nucleation emerges firstly in the cou rse of alloy precipitation, which refines the alloy's microstructure and obviou sly improves the mechanical properties at room and high temperature. The average grain size of AZ31 magnesium alloy containing Y is reduced by 35.82%. Tensile s trength, yield strength and elongation percentage reach 212 MPa, 147 MPa, and 7. 5% at room temperature respectively, and 117 MPa, 98 MPa, and 10.2% at 200 ℃ re spectively.

结果表明，Y在AZ31 镁合金中主要以块状Al2Y化合物形式存在；高熔点的Al2Y在合金凝固过程中首先析出，成为凝固的异质形核剂，从而细化了合金组织，改善了室温和高温力学性能；由于Y的强化，含Y AZ31镁合金平均晶粒尺寸降低幅度约为35.82 %；室温抗拉强度、屈服强度和延伸率分别为 212 MPa， 147 MPa和7.5%，200 ℃时分别为117 MPa， 98 MPa和10.2%。

Three counter-examples of topological space are proposed in this study: There are two metric spaces, X and Y, in which and are isometric, whileand are not isometric; Non-metric tight regular space is a counter-example of the separation of topological space; No non-zero continuous linear functionals of the linear topological space is a counter-example of linear topological space.

这里给出三个反例，存在两个度量空间X与Y，使X^2与Y^2等距而X与Y并不等距是拓扑空间中的反例；存在不可度量化的紧的完全正规空间是拓扑空间分离性的反例；不存在非零连续线性泛函的线性拓扑空间是线性拓扑空间的反例。

Consider singular growth curve model as follows : Y = ABC + E , where A , C are all known matrices, B is an unknown matrix of regression coefficients , Y is a matrix of observations and E =(1,(2),... is matrix of random errors .

考虑奇异增长曲线模型：Y=ABC+E，其中A、C均为已知矩阵，B是未知回归系数阵，Y为观测资料阵，E=ε_((1)…ε_(n′为随机误差阵，假定Eε_(iε_(i′=∑，i=1，2…n，Eε_(iε_(j′=0，i≠j，这里∑≥0。

Consider singular growth curve model as follows : Y = ABC + E , where A , C are all known matrices, B is an unknown matrix of regression coefficients , Y is a matrix of observations and E =(1,(2),...

中文摘要：考虑奇异增长曲线模型：Y=ABC+E，其中A、C均为已知矩阵，B是未知回归系数阵，Y为观测资料阵，E=ε_((1)…ε_(n′为随机误差阵，假定Eε_(iε_(i′=∑，i=1，2…n，Eε_(iε_(j′=0，i≠j，这里∑≥0。

Calidonian granites are widely developed in the Yema Nanshan area in the western segment of the Qilian orogenic belt. The geochemical characteristics of most of the granites are similar to those of adakites: SiO2≥56%, Al2O3≥15.0%, low MgO (average 2.04%), high Sr (257-889μg/g, average 546.42μg/g), low Y (7.1-25.3μg/g,average 16.67μg/g), average Sr/Y=5.89, no pronounced Eu anomaly and Sr positive anomaly. Adakites in this area have five rock types, quartz diorite, quartz monzodiorite, quartz monzonite, monzogrannite and hornblende granite. These rocks commonly contain hornblende, belonging to I-type granites.

提要：祁连西段野马南山一带发育大量的加里东期花岗岩，其中大部分花岗岩具有与adakite岩相似的地球化学特征，SiO2≥56%， Al2O3≥15.0％，低MgO（平均2.04％），高Sr(257～889μg/g，平均值546.42μg/g)，低Y（7.1～25.3μg/g，平均16.67μg/g），Sr/Y平均为35.89μg/g，Eu无明显负异常，Sr正异常，Adakite岩石类型有石英闪长岩、石英二长闪长岩、石英二长岩、角闪花岗岩、二长花岗岩，岩石中普遍含有角闪石，属I型花岗岩，地球化学图解反映该花岗岩形成环境为板块碰撞前的岛弧型，锆石U-Pb同位素年龄为444+38/-33 Ma，处在祁连造山带板块俯冲收缩阶段，因此可以推断野马南山埃达克质Adakite花岗岩是俯冲板片部分融熔和壳幔岩浆混合形成的。

Moony, Wormtail, Padfoot, and ProngsGroup of students at Hogwarts c. 1970-1978 Y-10 to Y-2

四个霍格沃茨的学生，就学期间大约在1970－1978（Y-10 to Y-2

The metalloproteins which are widely distributed in vivo are very important target molecules of NO. A new Y/〓 reaction system which can form Y-NO bond has been established and has been used to measure the NO affinity of metalloporphyrins as metalloprotein models. Three kind of bond energies of the Co-NO bonds in series of cobalt nitrosyl tetraphenylporphyrins have been determined by thermodynamic cycles combined with calorimetric measurements and relevant electrochemical data.

本文以金属卟啉模拟体内重要的NO靶分子金属蛋白，通过确立新的适于量热和电化学测定的Y／〓成Y-NO键反应体系，利用合适的热力学循环，建立了新的适于金属卟啉体系的NO亲合势的测定方法，得到了苯腈中系列亚硝基四苯基钴卟啉Co-NO键的键能，即钴卟啉NO亲合势的定量标度，以表征钴卟啉的NO结合能力。

Here the Y axis was set to the standard axis system Y axis, and a 15 degrees angle was set in relation to an edge parallel to the X axis.

这里Y轴的设置方式如同标准轴系统Y轴的设置方式，15度表示绕X轴转动的角度。

The human Y chromosome is paternally inherited in a haplotype model. This feature make the Y-specific polymorphic markers are very useful in different fields of science, including genealogy, population genetics and forensic science.

人类Y染色体为正常男性特有、其大部分非重组区呈父系单倍型遗传等特点，使得Y染色体特异的多态性遗传标记成为人类学、群体遗传学及法医学等领域中非常有用的工具。

Berlin wool work and similar petit point stitcher y resembles the heavil y shaded, opulent st y les of cross-stitch, and sometimes also used charted patterns on paper.

柏林羊毛工作和类似的小点stitcher y 类似于重阴影，华丽的风格的挑花，有时也用在纸面上绘制图案。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。