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The influence of alternating current magnetic fields on the solidification structure of hypoeutectic Al-7%Si alloy was studied.

中文摘要：研究了在交流磁场下凝固的Al-7%Si合金晶内Si溶质元素含量及凝固组织的变化。

The alloys are hypoeutectic in the range of 2-8%Si,which distributed in both α-Fe and Fe_2B phases.

当Si含量为2-8%wt时，Fe-2.5B-XSi是亚共晶组织，Si分布在-αFe和Fe2B相中。

The preliminary results show that the peak of HSiO〓 with the baseline width of about 4ppm in 〓Si-NMR spectrum is getting narrower, which shows that the regularity of the ladderlike polymer is further improved.

初步结果发现〓Si-NMR谱中代表梯形主链上Si原子峰的基线宽度降低到4ppm，表明梯形聚氢基倍半硅氧烷的规整性有进一步提高。

Molal contents of alkalescence component and alumina showed in the Seger-formula were similar to each other in the same series. Mixture of materials was melted at 1 270～1 290 ℃, and treated with heat preservation in the range of crystallization temperatures (at 1120 ℃) for 25 minutes. Results showed: if CaO/MgO≈1, crystallate was melilite when O/Si was cl...

结果显示：CaO/MgO≈ 1时，O/Si值近于3 。1时析出钙镁黄长石，在 3左右同时出现黄长石和透辉石，小于 3为透辉石，继续减小开始产生少量硅灰石；CaO/MgO≈0 。5时，O/Si值大于 3 。1时同时形成钙镁黄长石和透辉石，近于 3时仅出现透辉石。

They are the easy nitridation of Si surface and the poor wetting properties of GaN on Si substrate.

采用低温生长GaN缓冲层，随后进行高温GaN生长的&两步生长法&，对Si上GaN的生长进行了深入系统的研究。

The relationship of the nitridation rate of Al-Mg-Si alloys with temperature from room temperature to 1300℃ was investigated by TG experiments.

通过程序升温法热重实验，考察了Al-Mg-Si合金从室温至1300℃范围氮化反应速率随温度的变化规律，实验验证了Al-Mg-Si合金的直接氮化符合阿累尼乌斯公式。

Si alloy thixotropic deformation behavior has been established. Phenomenologically, An internal variable framework effectively combines the microstructure level structural kinetics with the maroscopic flow behavior.

采用自制的半固态合金固液两相区力学性能测试装置进行半固态Al-7.0％Si合金的触变力学性能的研究，建立了半固态Al-7.0％Si合金触变变形行为的幂律模型。

29Si NMR spectra indicate that SAPO-11 sample with an Si/Al of 0.33 significantly enhances the neighboring region between SAPO region and Si region, and NH_3-TPD results also show it has higher strong acid/weak acid ratio.

33的SAPO-11的SAPO区与Si区的交界区明显扩大，与之对应的NH_3-TPD也表明有较高的中强酸/弱酸比例。

The results show that the SAPO–5 has a pillar-like morphology with the size of about 20 μm×5 μm×5 μm.The ratio of P:Al:Si is 1:1.19:0.67 in its crystal structure, the content of Si is high. The total acidimety fo the SAPO–5 is 578.0 μmol/g , hihger than that of prepared by one step crystalline hydrothermal method.And its initial catalysis character performance on normal butane isomerization reaction reach 24.8 %, higher than that of prepared by one step crystalline hydrothermal method.

实验结果表明：产物为柱状的磷酸硅铝分子筛，其晶粒尺寸大约为20 μm×5 μm×5 μm，其晶体结构中P：Al：Si＝1：1.19：0.67，硅含量较高；采用分段晶化方式制备的SAPO-5分子筛的总酸量为578.0 μmol/g高于一段晶化方式制备的SAPO-5分子筛的总酸量；采用分段晶化生成的SAPO-5分子筛的催化正丁烷异构化反应初始活性可达到24.8 %，远高于一段晶化制备的SAPO-5分子筛的初始活性14.1 %。

The differences in the diffusion ability of Si in the common and rapid solidifiable Al-Si brazing metal were preliminarily investigated and discussed.

实验结果表明，普通钎料和快冷钎料中Si元素在母材基体中的扩散过程基本相同。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。