frequency source
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Chen Ji ◽  
Ralph J. Archuleta

Abstract We investigate the relation between the kinematic double-corner-frequency source spectral model JA19_2S (Ji and Archuleta, 2020) and static fault geometry scaling relations proposed by Leonard (2010). We find that the nonself-similar low-corner-frequency scaling relation of JA19_2S model can be explained using the fault length scaling relation of Leonard’s model combined with an average rupture velocity ∼70% of shear-wave speed for earthquakes 5.3 < M< 6.9. Earthquakes consistent with both models have magnitude-independent average static stress drop and average dynamic stress drop around 3 MPa. Their scaled energy e˜ is not a constant. The decrease of e˜ with magnitude can be fully explained by the magnitude dependence of the fault aspect ratio. The high-frequency source radiation is generally controlled by seismic moment, static stress drop, and dynamic stress drop but is further modulated by the fault aspect ratio and the relative location of the hypocenter. Based on these two models, the commonly quoted average rupture velocity of 70%–80% of shear-wave speed implies predominantly unilateral rupture.

Sensors ◽  
2022 ◽  
Vol 22 (2) ◽  
pp. 504
Ranran Zhao ◽  
Yuming Zhang ◽  
Hongliang Lv ◽  
Yue Wu

This paper realized a charge pump phase locked loop (CPPLL) frequency source circuit based on 0.15 μm Win GaAs pHEMT process. In this paper, an improved fully differential edge-triggered frequency discriminator (PFD) and an improved differential structure charge pump (CP) are proposed respectively. In addition, a low noise voltage-controlled oscillator (VCO) and a static 64:1 frequency divider is realized. Finally, the phase locked loop (PLL) is realized by cascading each module. Measurement results show that the output signal frequency of the proposed CPPLL is 3.584 GHz–4.021 GHz, the phase noise at the frequency offset of 1 MHz is −117.82 dBc/Hz, and the maximum output power is 4.34 dBm. The chip area is 2701 μm × 3381 μm, and the power consumption is 181 mw.

Desheng Zhou ◽  
Jingfeng Tang ◽  
Qiang Liu ◽  
Liwei Zhou ◽  
Liqiu Wei ◽  

Abstract Breaking through the corona discharge current limit and improving the ionization and acceleration process are beneficial to improve the performance of the electroaerodynamic thruster. In this paper, a dual-frequency source of DC and NSP (nanosecond pulse) are applied to generate ionic wind. Electrical, optical and thrust characteristics are compared for the electroaerodynamic thruster with and without the NSPD (nanosecond pulse discharge). The experimental results indicate that the thrust characteristics are enhanced under the effect of dual-frequency sources. Moreover, the inception DC voltage to generate ionic wind is much lower.

2021 ◽  
Vol 150 (5) ◽  
pp. 3914-3928
J. A. Castro-Correa ◽  
M. Badiey ◽  
T. B. Neilsen ◽  
D. P. Knobles ◽  
W. S. Hodgkiss

2021 ◽  
Vol 28 (11) ◽  
pp. 113504
Xiao-Yan Sun ◽  
Yu-Ru Zhang ◽  
You-Nian Wang ◽  
Jian-Xin He

Abel T. Gumaran ◽  
Danna Karyl Jane C. Talde

This study aimed to analyze how identification worked as a key to persuasion among agents in Frontrow Enterprise, an MLM company. Specifically, it sought to find the prevalent source of identification, identification strategy used by the Frontrow agents in their speeches, and their level of persuasion. This study employed descriptive-qualitative design which utilized critical analysis using the Theory of Identification and Consubstantiality. Results show that the highest frequency source of identification found in the speeches is the idealistic identification and the highest frequency identification strategy is the common ground. Based on the findings of the study, it can be concluded that persuasion is manifested using shared interest, attitude, perceptions, values, beliefs, and ideas through establishing common grounds with the audience. KEYWORDS: Multi-level Marketing, Identification and Consubstantiality, Level of Persuasion, Agents’ Speeches, Sources of Identification, Identification Strategies

PLoS ONE ◽  
2021 ◽  
Vol 16 (9) ◽  
pp. e0257192
Tadeusz Chełkowski ◽  
Dariusz Jemielniak ◽  
Kacper Macikowski

As Free and Open Source Software (FOSS) increases in importance and use by global corporations, understanding the dynamics of its communities becomes critical. This paper measures up to 21 years of activities in 1314 individual projects and 1.4 billion lines of code managed. After analyzing the FOSS activities on the projects and organizations level, such as commits frequency, source code lines, and code comments, we find that there is less activity now than there was a decade ago. Moreover, our results suggest a greater decrease in the activities in large and well-established FOSS organizations. Our findings indicate that as technologies and business strategies related to FOSS mature, the role of large formal FOSS organizations serving as intermediary between developers diminishes.

Hongbo Yin ◽  
Dahai Ni ◽  
Kun Chen ◽  
Decai Zhang ◽  
Cheng Chen

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