一般材料的模量会随温度的增加而降低,但相变会导致模量的异常软化,使得其模量与温度的关系表现为dE/dT＞0.正常材料的dE/dT＜0的温度范围是整个温度区间,而dE/dT＞0对应的温度区间则比较狭窄,结合目前的模量软化结果,发现单一的结构相变或磁性相变或有序化相变,其dE/dT＞0对应的温度区间均不超过50K,当相变结束时,其模量变化特征又呈现正常的dE/dT＜0.这种狭窄的区域使得其实际应用价值
Recently,a giant strain of 0.45％was observed in 92(Bi1/2Na1/2)TiO3-6BaTiO3-2(K,Na)NbO3(BNT-BT-2KNN)(with 2 mol％KNN)incipient piezoceramic at room temperature,which is higher than the strain of a comme
β钛合金(体心立方结构)冷加工后产生多种物相，如{112}孪晶、ω相(非密排六方结构)，在电子衍射时，多种物相或晶体一起参与，使得衍射花样变复杂。单晶电子衍射花样可以查阅标准电子衍射花样快速标定，而多种晶体产生的复合衍射花样没有所谓的"标准花样"。为此，我们可以在各相(材料中可能的几个相或孪晶)之间建立位向关联，使晶面、晶向指数在不同晶体坐标中可以互相转换，结合衍射规律，我们就能绘制出这种标准的复
利用分子动力学方法,模拟包含不同取向{10(-12)}＜10(-1)(-1)＞孪晶界的纳米孪晶镁的单轴拉伸与单轴压缩行为.通过使加载方向与孪晶界呈不同角度,研究不同取向下不同的变形机制.由此揭示了在含有孪晶界的纳米孪晶中不同取向{10(-12)}＜10(-11)＞纳米孪晶镁在单轴荷载下的变形机制.
A narrow linewidth 1908nm Tm:YLF laser was established based on a Volume Bragg Grating(VBG) as the reflection mirror,the maximum output power of 15.53W when the incident pump power of 48.2W was obtain
Nd:YAG laser as the most commonly used solid-state laser light source,can realize CW and pulse operation at room temperature in a variety of ways,but for the working materials,laser transparent polycr
To obtain high single pulse energy and high beam quality second harmonic generation,a double-arched LDA stagger pumped electro-optic Q-switched Nd:YAG with a convex-concave compensate resonator system
A diode-pumped acousto-optic(AO)Q-switched master oscillator power amplifier (MOPA) all-solid-state laser with high repetition rate and high pulse energy is demonstrated by using a master oscillator p
High contrast grating (HCG) is a subwavelength nanostructure which can supply high reflectance and wide reflectivity bandwidth.
The process of cell mitosis is very important for understanding the cell reproduction,which involves multiply molecules function cooperatively.