Excel在电化学阻抗谱实验中的应用

利用Excel数据处理功能和图表功能,处理电化学阻抗谱实验中的实验数据,确定可疑数据的取舍、处理数据,绘制FATT50与电化学元件(CR)阻抗的关系曲线,利用趋势曲线进行线性回归并分析实验结果。

微波波导负载阻抗测量与匹配虚拟仿真实验系统设计

负载阻抗测量和匹配是微波技术课程中的重要知识点,也是微波工程实践中的常用技术。基于虚拟现实技术与微波技术理论,该文设计研制的一套面向波导系统中负载阻抗测量和匹配的虚拟仿真实验系统,不仅高度仿真了实物器件的外观,而且具有较好的操作性和交互性,与实物实验教学相结合,大大提升了波导系统中阻抗测量与匹配的实验教学效果。

Permeability Estimation of Shale Oil Reservoir with Laboratory-derived Data: A Case Study of the Chang 7 Member in Ordos Basin

The shale oil reservoir within the Yanchang Formations of Ordos Basin harbors substantial oil and gas resources and has recently emerged as the primary focus of unconventional oil and gas exploration and development.Due to its complex pore and throat structure,pronounced heterogeneity,and tight reservoir characteristics,the techniques for conventional oil and gas exploration and production face challenges in comprehensive implementation,also indicating that as a vital parameter for evaluating the physical properties of a reservoir,permeability cannot be effectively estimated.This study selects 21 tight sandstone samples from the Q area within the shale oil formations of Ordos Basin.We systematically conduct the experiments to measure porosity,permeability,ultrasonic wave velocities,and resistivity at varying confining pressures.Results reveal that these measurements exhibit nonlinear changes in response to effective pressure.By using these experimental data and effective medium model,empirical relationships between P-and S-wave velocities,permeability and resistivity and effective pressure are established at logging and seismic scales.Furthermore,relationships between P-wave impedance and permeability,and resistivity and permeability are determined.A comparison between the predicted permeability and logging data demonstrates that the impedance–permeability relationship yields better results in contrast to those of resistivity–permeability relationship.These relationships are further applied to the seismic interpretation of shale oil reservoir in the target layer,enabling the permeability profile predictions based on inverse P-wave impedance.The predicted results are evaluated with actual production data,revealing a better agreement between predicted results and logging data and productivity.

基于EMI技术的质量流量计U型管动态测试研究

针对质量流量计U型管(以下简称U型管)的频率特性对质量流量计的性能影响较大的问题,以U型管为研究对象,研究施加动态信号后,其导纳和阻抗值变化对其频率特性的影响。首先,搭建了声学实验和压电阻抗实验平台,对U型管进行了声学实验和阻抗实验;其次,对U型管进行了模态分析,并将实验结果与模态分析结果进行了比较,得到了两者一致的结果;最后,搭建了对U型管施加动态信号的阻抗实验平台,对U型管的共振区、低频非共振区、高频非共振区分别进行了实验。研究结果表明:当扫频信号接近所加的共振信号时,会发现明显的共振现象,且共振信号对U型管固有特性的影响大于非共振信号。

微小孔超声电火花复合加工通孔变幅杆设计

超声电火花复合加工在微小孔制备方面应用颇多,其常见问题有:在生产同一批零件更换电极丝时,不能保证二次装夹的精度;加工过程中,电蚀废屑堆积会造成各种不良影响等。基于以上问题设计了一种轴心通孔式变幅杆,并在变幅杆两端增加两个定位螺柱。为保证微小孔加工的精度和圆度,选择了两种稳定性高的变幅杆(悬链线形和圆锥形)进行分析。将预先设计的变幅杆在SolidWorks软件建模后导入ANSYS软件中进行有限元分析,观察仿真结果与设计参数的异同,通过调节变幅杆长度进行参数优化,降低谐振频率的误差。最终选择圆锥形变幅杆加工出实物,应用阻抗分析实验验证了该圆锥形变幅杆的可行性。

Petrologic composition model of the upper crust in Bohai Bay basin,China,based on Lamé impedances

Seismic attributes, such as P- and S-wave velocity, Poisson＇s ratio, and acoustic impedances, all generally can be used for distinguishing different rock types. The nonuniqueness can be largely reduced using Lame impedances instead of acoustic impedances as additional constraints. We have followed this method to constitute a petrologic composition model of the upper crust in the Bohai Bay basin, China. We briefly review the seismic parameters used for discrimination of rock types and focus our attention on the sensitivity of different combinations of parameters to determine the composition of materials. Corrections for pressure and temperature are performed in order to compare elastic wave velocities and densities measured at room temperature and surface pressure in laboratory with those for representative rock parameters. In a second step, we find the rock classes in the tested area by contrasting known data to laboratory measurements on a variety of rock samples extracted in the area. The basic field data are P-wave velocity values collected along a seismic profile conducted in the Bozhong Depression. The different rock types belonging to a particular rock class are finally constrained by the seismic velocities, Poisson＇s ratio, density, acoustic impedance, and Lame imoedance related to the topmost 10 km of the Bohai Bav crust.

Ultrasonic power features of wire bonding and thermosonic flip chip bonding in microelectronics packaging

The driving voltage and current signals of piezoceramic transducer (PZT) were measured directly by designing circuits from ultrasonic generator and using a data acquisition software system. The input impedance and power of PZT were investigated by using root mean square (RMS) calculation. The vibration driven by high frequency was tested by laser Doppler vibrometer (PSV-400-M2). And the thermosonic bonding features were observed by scanning electron microscope (JSM-6360LV). The results show that the input power of bonding is lower than that of no load. The input impedance of bonding is greater than that of no load. Nonlinear phase, plastic flow and expansion period, and strengthening bonding process are shown in the impedance and power curves. The ultrasonic power is in direct proportion to the vibration displacement driven by the power, and greater displacements driven by high power (>5 W) result in welding failure phenomena, such as crack, break, and peeling off in wedge bonding. For thermosonic flip chip bonding, the high power decreases position precision of bonding or results in slippage and rotation phenomena of bumps. To improve reliability and precision of thermosonic bonding, the low ultrasonic power (about 1-5 W) should be chosen.

Cold-Test Experimental Research of an S-Band Broadband High Power CCTWT

Cold-test experiment of an S-band broadband high power coupled-cavity traveling-wave tube(CCTWT)is introduced in this paper.The dispersion characteristic,the synchronous voltage and the interaction impedance of this S-band CCTWT are measured.The experimental results are in agreement with the numerical simulation values.