光纤持气率测井仪响应规律的实验研究

为考察现有光纤持气率计在油气水三相流中的响应特性,采用多相流标定装置对其进行测定,系统研究光纤持气率计在油量固定不变含水量不同条件下的持气率响应规律。实验结果表明,当油量为5m3/d、气量小于10m3/d时,持气率随含气量的增大而增大,二者线性变化程度较低;而气量在10～35m3/d之间变化时,持气率随含气量的增大而线性增大。

Effect of substrate temperature on structure and magnetism of Zn0.98Cr0.02O thin films

Zn0.98Cr0.02O thin films were deposited on Si (100) substrates by using magnetron sputtering method. The structure and magnetic properties of the films were characterized by X ray diffractrometry (XRD), X ray photoelectron spectroscopy(XPS), scanning electron microscopy (SEM) and physical property measurement system (PPMS). The effects of substrate temperature on the structures, composition, surface morphology and magnetic properties of the films were studied. XRD patterns show that Zn0.98Cr0.02O thin films with a preferential c axis orientation exhibit the wurtzite structure. XPS spectra reveals that the Cr ions are in a +3 charge state in the films. Magnetization measurements indicate that the Zn0.98Cr0.02O samples exhibit ferromagnetic behavior. Moreover, the ferromagnetic properties become weaker with the increase of the substrate temperature.