查询词典 tungsten

Electrodes for DC welding are normally pure tungsten with 1 to 4% thoria to improve arc ignition.

其它添加物氧化镧、氧化铈据称具有更优越的性能。

F Electrodes for DC welding are normally pure tungsten with 1 to 4% thoria to improve arc ignition.

其它添加物氧化镧、氧化铈据称具有更优越的性能。

In the past, pure tungsten was the only choice for AC TIG welding.

在过去，唯一的选择是纯钨交流TIG焊。

Q: What type of tungsten should I use for AC and DC TIG welding?

问：我应该用什么样的交直流TIG焊钨电极？

Analyze the necessarily and possibility of tungsten detect in automatic TIG welding system.

分析了TIG焊自动焊接设备钨极检测的必要性与可行性。

The result indicate that: the electrodeposition of zinc on nickel and tungsten substrates involves instantaneous three-dimensional nucleation. The coating is the best when the current density is 4mA/cm2 and the temperature is 80 ℃. The coating by the method of the impulse electrodeposition is better than the direct current electrodeposition. Especially when f is 100Hz, ton/toff is 2/8 and J is 8mA/cm2, the coating is clean and uniformity. The crystal size is nearly 0.3μ m .

结果表明：阴极反应为准可逆反应，锌离子在镍电极和钨电极上形核是三维瞬时形核半球形扩散长大过程，直流电流密度为4mA/cm2，温度为80 ℃时，镀层质量最好；脉冲电沉积得到的镀层要优于直流电沉积得到的镀层，尤其在脉冲宽度为2ms，脉冲间隔为8ms，电流密度为8mA/cm2时，得到的镀层光滑而均匀，颗粒大小接近0.3μm。

Ages of such minerals as muscovite, quartz, tourmaline and beryl from the Lushui tungsten-tin deposit in western Yunnan were determined by 40Ar-39Ar method. The trace K minerals all form saddle-shaped age spectra of excess 40Ar.

中文摘要：采用40Ar-39Ar计时方法测定滇西泸水钨锡矿床的白云母、石英、电气石和绿柱石等矿物的年龄，其中微量K矿物均形成含过剩40Ar的马鞍形年龄谱。

P. P. Raevski〓, and pointed that this polarization at grain boundary between WO〓 monoclinic and triclinic phases causes a modification to Schottky barrier is origin of nonlinear electrical characteristic of tungsten oxide polycrystalline ceramics.

Raevski〓的铁电半导体非线性电输运理论模型的框架内，我们重点考虑了铁电极化对WO〓陶瓷非线性电输运特性的影响，指出由于三斜和单斜晶相的共存，在其晶界处存在的电极化可以对Schottky势垒产生一种修正，是导致出现压敏现象的一个重要因素。

Tungsten trioxide , as one kind of functional materials with great potential for technological application...

三氧化钨是一种具有广泛应用前景的功能材料，在诸如电致变色、气体探测和化学催化等方面已得到较系统的研究。

Instead, for higher current applications, it is best to grind your tungsten to a truncated tip.

反之，高电流应用，这是一个最好的磨你钨截短冰山。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。