Effects of high working pressure on dielectric properties of sputtered (Ba,Sr)TiO3 films on Ir electrodes

2003 ◽  
Vol 21 (4) ◽  
pp. 1464-1468
Author(s):  
Chih-Haung Lai ◽  
Y. C. Wu ◽  
S. Ma
Keyword(s):  
Dielectric Properties ◽  
Working Pressure ◽  
High Working Pressure

Experimental and theoretical studies on the pressure fluctuation of an internal gear pump with a high pressure

2018 ◽  
Vol 233 (3) ◽  
pp. 987-996 ◽  
Author(s):  
Ying-Yuan Liu ◽  
Yi-Ran Li ◽  
Le-Qin Wang
Keyword(s):  
Pressure Pulsation ◽  
Rotational Frequency ◽  
Gear Pump ◽  
Operating Pressure ◽  
Pressure Pulsations ◽  
Working Pressure ◽  
High Rotational Speed ◽  
Gear Ring ◽  
Internal Gear ◽  
High Working Pressure

In this paper, the flow ripple equation is derived to analyze the effect of working condition on pressure pulsations of an internal gear pump. Results indicate that working pressure has a significant effect on pressure fluctuation of the internal gear pump, while the rotating speed has a complex influence on the pressure pulsation behavior. Then, pressure pulsations of the internal gear pump under different working conditions are discussed by experimental investigations. Results show that the internal gear pump taken for analysis has a low-pressure pulsation at a high working pressure and a relatively high rotational speed. Regarding the frequency spectrum of the pressure pulsation, the dominant frequency is Z* fn, i.e. the product of the tooth number of the driving gear (gear shaft) and its rotational frequency for many working conditions, caused by the inevitable unsteady discharge process of gear pumps. It transforms to the rotational frequency of the gear shaft ( fn) for a high rotational speed or a high operating pressure, but to the rotating frequency of the internal gear ring (2/3 fn) only for a high operating pressure. The occurrence of the two frequencies (2/3 fn and fn) may result from the deformation of the gear ring and the gear shaft under the unbalanced radial forces caused by a high working pressure. Moreover, the frequency spectrum of the inlet pressure pulsation presents some differences from that of the outlet pressure pulsation. This is because the inlet pressure may be influenced by cavity generated at the suction side of the pump.

High-Working-Pressure Sputtering of ZnO for Stable and Efficient Perovskite Solar Cells

2019 ◽  
Vol 1 (3) ◽  
pp. 389-396 ◽  
Author(s):  
Abhishek Thote ◽  
Il Jeon ◽  
Hao-Sheng Lin ◽  
Sergei Manzhos ◽  
Takafumi Nakagawa ◽  
...  
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Working Pressure ◽  
High Working Pressure

Stresses in Amorphous Gd-Fe Alloy Thin Films Deposited by Magnetron Sputtering

1990 ◽  
Vol 188 ◽  
Author(s):  
Zhi-Feng Zhou ◽  
Qi-Gang Zhou ◽  
Yu-Dian Fan
Keyword(s):  
Thin Films ◽  
Magnetron Sputtering ◽  
Compressive Stress ◽  
Bias Voltage ◽  
Negative Bias ◽  
Negative Bias Voltage ◽  
Working Pressure ◽  
Planar Magnetron ◽  
Very High ◽  
High Working Pressure

ABSTRACTAmorphous Gd-Fe alloy thin films were made by D.C. planar magnetron sputtering under various deposition conditions (e.g., film thickness, composition, working pressure of Ar, negative bias voltage and deposition rate). The stress, the film composition and the content of entrapped Ar in the films were measured respectively. The experimental results showed that in this case the working pressure of Ar and the negative bias voltage did not change the composition of the films, and the stresses were all compressive except for the films deposited in a very high working pressure of Ar. The origin of the compressive stress can be attributed to the atomic peening effect produced by fast neutral working gas atoms rebounded from the sputtering target. The magnitude of the compressive stress depends not only on the amount of Ar atoms incorporated in the films but also on the film microstructure such as the packing density.

Theoretical and experimental study on sealing performance of a novel ultra-high pressure bursting disc

2020 ◽  
pp. 095440892095989
Author(s):  
Chao Yang ◽  
Hu Hui ◽  
Song Huang
Keyword(s):  
High Pressure ◽  
Mechanical Analysis ◽  
The Novel ◽  
Device Structure ◽  
Working Pressure ◽  
Burst Test ◽  
Ultra High Pressure ◽  
Sealing Performance ◽  
Sealing Ring ◽  
High Working Pressure

Bursting disc overpressure relief device services as the last safety barrier in preventing catastrophic overpressure of the pressure vessel. The design of ultra-high pressure bursting disc device is a tough engineering issue as it requires both strength and sealing reliability under ultra-high working pressure. In this paper, a novel ultra-high pressure bursting disc device is proposed as well as the sealing structure is designed. Firstly, the novel bursting disc device structure is introduced. Then, the wall thickness of the sealing ring is designed based on elastoplastic mechanical analysis. Numerical simulation is also conducted to investigate the mechanical and sealing performance theoretically. At last, the strength and the reliability of the sealing performance is proved by hydraulic burst test.

Inner Defect Induced Crack Growth Analysis and Fatigue Life Prediction for Anthropogenic CO2 Pipelines

2012 ◽  
Vol 204-208 ◽  
pp. 2981-2984 ◽  
Author(s):  
Qiao Jin ◽  
Ming Li ◽  
Quan Wen
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Crack Growth ◽  
Growth Analysis ◽  
Working Pressure ◽  
Inner Pressure ◽  
Transmission Pipeline ◽  
Finite Element Procedure ◽  
Co2 Transportation ◽  
High Working Pressure

One approach to limiting CO2 emissions from oxidation of carbon-based fuels is to capture the CO2 and store it, possibly in onshore or offshore subsurface geologic formations. From the CO2 transportation structure perspective, a critical component of this approach is the pipeline transportation of supercritical or dense CO2. In CCS, the pipelines undertaking a CO2 transportation task suffer various loads, the effects of which is easily aggravated due to the existence of a high working pressure (above 7.4MPa) and inner corrosion. For the application of anthropogenic CO2 pipe transportation technique, this paper will address a LEFM-based finite element method which can evaluate fatigue life for a CO2 transmission pipeline containing a semicircle inner defect. Specifically, a portion of welded round steel pipeline is selected as the object of our analysis. Under the inner pressure fluctuation scenarios, an FRANC2D finite element procedure is generated to simulate mode-I crack extension from a given inner edge crack, which initiates from the half circle defect,and the corresponding stress intension factors(SIFs), , and its increment, , varied with different cracking depths, are calculated and compared. Afterwards, the fatigue lives for the pipeline with the defects of different sizes are obtained by using a modified Paris formula which can analyze the influence of crack closure and stress ratio. Thus, the relation between the fatigue life of CO2 pipelines and the dimension of the inner defect can be determined by performing the proposed fatigue crack growth analysis.

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