查询词典 Si

It is introduced that Si- Ca- Ba- Al alloy is smelted with carbon- thermal process in submerged electric furnace,and it is indicated that Si- Ca- Ba- Al alloy is a new effective deoxidant and desulphurizing agent,and has a wide application future.

介绍了碳热法冶炼 Si- Ca- Ba- Al合金的生产实践，指出 Si- Ca- Ba- Al作为高效的脱硫脱氧剂，应用前景广阔。

Based on an analysis of symmetry, the dispersion relations near the Δ valley in strained Si(subscript 1-x)Ge (0≤x.45)/(001),(111),(101) Si are derived using the KP method with perturbation theory.

基于对称性分析，应用KP微扰理论确定了应变Si(下标 1-x)Ge(0≤x.45)/(001)，(111)，(101)Si的Δ能谷附近的色散关系。

The equilibrium phase diagram of Ti-Si-C ternary system and the estimates of the unknown thermodynamic data of carbides and silicates were used to calculate stabilized chemical potential and to draw the stabilized chemical potential diagram s of Ti-Si-C ternary system.

收集并计算了 Ti－Si－C三元系在 1200℃温度下各组元化合物的热力学数据，利用Ti－Si－C三元系在该温度下的平衡相图以及对碳化物未知热力学数据所做的估算，计算该三元系中各组元化学位并作出的相应的化学位稳定性相图。

The effect of mould temperature on the eutectic Si morphology of Al-Si alloy is investigated.

研究了模具温度对Al-Si合金中共晶Si形貌的影响。

National measurement standards may be primary standards, which are primary realizations of the SI units or agreed representations of SI units based on fundamental physical constants, or they may be secondary standards which are standards calibrated by another national metrology institute.

国家测量标准可以是基准，它们是 SI 单位的原级实现或是以基本物理常量为根据的 SI 单位约定的表达式，或是由其他国家计量院所校准的次级标准。

NOTE 3 Calibration laboratories that maintain their own primary standard or representation of SI units based on fundamental physical constants can claim traceability to the SI system only after these standards have been compared, directly or indirectly, with other similar standards of a national metrology institute.

注3： 持有自己的基准或基於基本物理常量的 SI 单位表达式的校准实验室，只有在将这些标准直接或间接地与国家计量院的类似标准进行比对之后，方能宣称溯源到 SI 单位制。

In this thesis, the AlN thin films were deposited on SiO2/Si and GaN/Sapphire substrates respectively for layered structure SAW devices by Helicon sputtering system. Laser ultrasound system was used to measure the acoustic wave velocity of AlN/SiO2/Si layered structure. Frequency response and insertion loss were measured by an HP8510C vector network analyzer to analysis insertion loss, sidelobe and quality factor. The results showed the possibility of incorporating thin films SAW devices with other semiconductor devices.

本研究使用回旋溅镀系统分别在SiO2/Si、GaN/Sapphire两种基板上沉积AlN并制作层状表面声波元件，并利用雷射超音波系统量测AlN/SiO2/Si结构之表面波速及机电耦合系数，再利用网路分析仪量测其频率响应，分析其插入耗损、 sidelobe、品质因子Q，以比较不同基材所制作之层状表面声波元件之特性，此研究成果初步验证AlN层状表面声波元件与半导体元件整合之可行性。

Effects of P modification on primary Si in hypereutectic Al-Si die casting alloy with different cooling rates were investigated.

以过共晶压铸铝合金为对象，研究了P变质对不同冷却速度下初晶Si组织的影响。发现P变质处理前后随冷却速度的增加，初晶Si尺寸减小的变化趋势十分相似，并且都存在一个明显的突变区域。

Experimental analysis showed that the liquid electrical resistivity of Al-Si alloy was nonlinear with temperature, and the viscosity interruptedly exponential with temperature. The liquid physical properties of Al-Si alloy were affected by not only liquid temperature but also microinhomogeneity.

实验研究表明，Al-Si合金液态电阻率和温度呈非线性关系，粘度和温度呈间断指数曲线关系，Al-Si合金液态物性不仅受温度而且受微观不均匀性影响。

The heat-reaction characteristics of Ni/Si and TiN/Ni/Si structure and the regularity for forming the NiSi film have been studied deeply and formed the excellent Ni-salicide shallow junction diode.

文中对Ni／Si和TiN／Ni／Si的热反应特性以及NiSi薄膜的形成规律进行了详细的研究。制备了优质的Ni硅化物浅结二极管。

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。