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In thepreparation of nickel sulfides, nanocrystalline NiS〓 was prepared by solvent-thermaltechnology. By adding a reductive atmosphere in the system, hexagonal phase NiS,which is a metaphase and stable at high temperature, was formed. TEM shows that theparticles are in nanorod shape.

在甲苯中合成了球形的NiS〓纳米粉,并通过还原气氛的调节制备出NiS亚稳相的纳米棒(1000x15nm),通过前驱物的改变,我们在还原性气氛中还制备出Ni〓S〓纳米粉;同时我们在实验中还发现溶剂对产物的形貌有很大的影响,在乙二胺中作溶剂,分别得到立方形CoS〓和NiS〓及FeS〓纳米棒。

The structures and stabilities of the ground-states for Cu13-nAgn clusters have been studied by Gupta model potential based on tight binding second moment approximation in combination with a genetic algorithm. It is found that the lowest energy structures of the pure clusters (n=0,13) are perfect icosahedron, and the structures for the bimetallic clusters (n=1~10) have stable structure which are slightly deformed with respect to the perfect icosahedron, The Cu atom prefers to occupy the center of the clusters with higher coordination numbers.

在混合团簇基态结构优化的遗传算法方案中增加了交换算子,结合Gupta紧束缚模型势研究了Cu13-nAgn团簇的最低能量结构,选择合适的交换和杂交概率,可有效地提高优化效率,优化结果表明,Cu13和Ag13是全对称的二十面体,n=1~10的混合团簇能形成稳定结构,其构型是在二十面体基础上发生畸变,Cu原子趋于处在团簇中心,随着Ag原子数目的增加,原子间的平均距离单调增加,团簇的结合能单调减小,Cu2Ag12和CuAg12只存在亚稳结构。

However, because of its metastable characteristic and inaccessibility for direct-contact measurement, the specific heat capacity of supercooled metallic liquids is difficult to be completely determined by experiment.

由于深过冷态是一种极易发生相变的亚稳态,因此通过实验获取深过冷液态金属的热物理性质有些是不可能的,有些则是非常困难且代价昂贵的。

The interatomic potential for Al-Mg alloys is different from the others used in the paper. Although it is the EAM type formalism of many-body potential, the functions of this potential are not analytical forms. The functions are described by a numerical set of points, whose values are the parameters to be optimized.

非晶态Ni〓Al加热至晶态结构需要比结晶更慢的加热速率,当加热速率较大时,得到了bcc型结构占有较大比例的结构,这可能是Ni〓Al的一种亚稳结构;当加热速率较小时,可以获得部分有序L1〓结构晶体,不过晶体中仍有少量hcp型结构存在。

Some amorphous binary alloy films have been successfully grown by ion beam assisted deposition .

本文阐述了用离子束辅助沉积技术制备非晶合金薄膜的基本思路,介绍了本研究组在二元合金系统里制备非晶和亚稳晶相的研究结果。

The universal formulases of a average internal energy of atom in metal and the two different kinds of metal atomic interaction potential have been derived by applying to the classical concept of the metalic structure and concerning the Gauss type ball symmetry of the around electronic density of atomic nucleus.

本文介绍了亚稳态Fe50Cu50固溶体晶格常数的测量结果,应用金属结构的经典概念并考虑到原子核周围电子密度的高斯型球对称分布,导出了计算金属中一个原子的平均内能和两种不同金属原子相互作用势的普遍公式。

In this paper, the ways to avert sparkle and metastability are described.

本文较系统地介绍和分析了己有的一些抑制"火花码"与"亚稳态"的方法。

Metastability and how to generate empty and full flag correctly is key in the design of asynchronous FIFO.

避免亚稳态问题及空满控制信号的产生是异步FIFO设计的两个关键。

Finally, this paper has pointed out "race and hazard" as well as "metastability" problem, analyzed producing mechanism, and given some general solution measures.

指出了设计中的"竞争冒险"和饱受困扰之苦的"亚稳态"问题,分析了产生机理,并给出了常用的解决措施。

When metastability occurs the clock-to-out time can be extended beyond the register's nominal tCO time.

亚稳态发生时,clock-to-out时间可能会延伸并超出寄存器名义上的tCO时间。

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