Chirp-free optical-signal generation using dual-and-direct current-voltage modulation of transistor lasers

2020 ◽  
Vol 45 (9) ◽  
pp. 2474
Author(s):  
Chien-Ting Tung ◽  
Shu-Wei Chang ◽  
Chao-Hsin Wu
Keyword(s):  
Direct Current ◽  
Optical Signal ◽  
Signal Generation ◽  
Current Voltage ◽  
Transistor Lasers ◽  
Direct Current Voltage

scholarly journals Energy Flux on a Micromotor Operating under Stationary Direct Current Voltage

2021 ◽  
pp. 127197
Author(s):  
Wenyu Zhang ◽  
Kohei Ohara ◽  
Yasunao Okamoto ◽  
Erika Nawa-Okita ◽  
Daigo Yamamoto ◽  
...  
Keyword(s):  
Energy Flux ◽  
Direct Current ◽  
Current Voltage ◽  
Direct Current Voltage

Experimental Study on Direct Current Voltage Assisted Carbonated Water-Flooding Mechanism in Tight Oil Reservoir

2021 ◽  
Author(s):  
Rukuan Chai ◽  
Yuetian Liu ◽  
Yuting He ◽  
Qianjun Liu ◽  
Wenhuan Gu
Keyword(s):  
Crude Oil ◽  
Direct Current ◽  
Oil Recovery ◽  
Co2 Sequestration ◽  
Water Flooding ◽  
Current Voltage ◽  
Direct Current Voltage ◽  
Carbonated Water ◽  
Ft Icr Ms ◽  
Ft Icr

Abstract Tight oil reservoir plays an increasingly important role in the world energy system, but its recovery is always so low. Hence, a more effective enhanced oil recovery (EOR) technology is urgently needed. Meanwhile, greenhouse effect is more and more serious, a more effective carbon capture and sequestration (CCS) method is also badly needed. Direct current voltage assisted carbonated water-flooding is a new technology that combines direct current voltage with carbonated water-flooding to enhance oil recovery and CO2 sequestration efficiency, simultaneously. Experimental studies were conducted from macroscopic-scale to microscopic-scale to study the performance and mechanism of direct current voltage assisted carbonated water-flooding. Firstly, core flood experiments were implemented to study the effect of direct current voltage assisted carbonated water on oil recovery and CO2 sequestration efficiency. Secondly, contact angle and interfacial tension/dilatational rheology were measured to analyze the effect of direct current voltage assisted carbonated water on crude oil-water-rock interaction. Thirdly, total organic carbon (TOC), gas chromatography (GC), and electrospray ionization-fourier transform ion cyclotron resonance-mass spectrometry (ESI FT ICR-MS) were used to investigate the organic composition change of produced effluents and crude oil in direct current voltage assisted carbonated water treatment. Through direct current voltage assisted carbonated water-flooding experiments, the following results can be obtained. Firstly, direct current voltage assisted carbonated waterflooding showed greater EOR capacity and CO2 sequestration efficiency than individual carbonated water and direct current voltage treatment. With the increase of direct current voltage, oil recovery increases to 38.67% at 1.6V/cm which much higher than 29.07% of carbonated water-flooding and then decreases, meanwhile, CO2 output decreases to only 35.5% at 1.6V/cm which much lower than 45.6% of carbonated water-flooding and then increases. Secondly, in direct current voltage assisted carbonated water-flooding, the wettability alteration is mainly caused by carbonated water and the effect of direct current can be neglected. While both carbonated water and direct current have evident influence on interfacial properties. Herein, with direct current voltage increasing, the interfacial tension firstly decreases and then increases, the interfacial viscoelasticity initially strengthens and then weakens. Thirdly, GC results indicated that crude oil cracking into lighter components occurs during direct current voltage assisted carbonated water-flooding, with the short-chain organic components increasing and the long-chain components decreasing. Meanwhile, TOC and ESI FT ICR-MS results illustrated that CO2 electroreduction do occur in direct current voltage assisted carbonated water-flooding with the dissolved organic molecules increases and the emergence of formic acid. Conclusively, the synergy of CO2 electrochemical reduction into formic acid in aqueous solution and the long-chain molecules electrostimulation pyrolysis into short ones in crude oil mutually resulted in the enhancement of crude oil-carbonated water interaction. This paper proposed a new EOR & CCS technology-direct current voltage assisted carbonated water-flooding. It showed great research and application potential on tight oil development and greenhouse gas control. More work needs to be done to further explore its mechanism. This paper constructs a multiscale & interdisciplinary research system to study the multidisciplinary (EOR&CCS) problem. Specifically, a series connected physical (Core displacement, Contact angle, and Interfacial tension/rheology measurements) and chemistry (TOC, GS, and ESI FT ICR-MS) experiments are combined to explore its regularity and several physics (Atomic physics) and chemistry (Electrochemistry/Inorganic Chemistry) theories are applied to explain its mechanisms.

Two modes of a plasma jet excited by a direct current voltage

2016 ◽  
Vol 25 (2) ◽  
pp. 025022 ◽  
Author(s):  
Xuechen Li ◽  
Panpan Zhang ◽  
Wenting Bao ◽  
Pengying Jia ◽  
Jingdi Chu
Keyword(s):  
Direct Current ◽  
Plasma Jet ◽  
Current Voltage ◽  
Direct Current Voltage

Direct Current Voltage Bias Effect on Laser-Induced Switching Bistability in VO$_{2}$-Based Device

2012 ◽  
Vol 5 (10) ◽  
pp. 102201 ◽  
Author(s):  
Giwan Seo ◽  
Bong-Jun Kim ◽  
Jeongyong Choi ◽  
Yong Wook Lee ◽  
Hyun-Tak Kim
Keyword(s):  
Direct Current ◽  
Bias Effect ◽  
Voltage Bias ◽  
Current Voltage ◽  
Direct Current Voltage

scholarly journals Surface acoustic wave amplification by direct current-voltage supplied to graphene film

2015 ◽  
Vol 106 (2) ◽  
pp. 023505 ◽  
Author(s):  
Z. Insepov ◽  
E. Emelin ◽  
O. Kononenko ◽  
D. V. Roshchupkin ◽  
K. B. Tnyshtykbayev ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Direct Current ◽  
Graphene Film ◽  
Wave Amplification ◽  
Current Voltage ◽  
Direct Current Voltage

An Intelligent Starter–Generator for Power-Supply Systems of Aircraft with Increased Direct-Current Voltage

2018 ◽  
Vol 89 (1) ◽  
pp. 1-4
Author(s):  
M. A. Kiselev ◽  
F. R. Ismagilov ◽  
V. E. Vavilov ◽  
D. Yu. Pashali ◽  
N. L. Babikova
Keyword(s):  
Direct Current ◽  
Power Supply ◽  
Current Voltage ◽  
Direct Current Voltage ◽  
Starter Generator ◽  
Supply Systems

Direct current voltage increment due to ac coupling in a high Tc superconducting coil

1998 ◽  
Vol 73 (26) ◽  
pp. 3932-3934 ◽  
Author(s):  
N. Shaked ◽  
I. A. Al-Omari ◽  
A. Friedman ◽  
Y. Wolfus ◽  
M. Sinvani ◽  
...  
Keyword(s):  
Direct Current ◽  
High Tc ◽  
Superconducting Coil ◽  
Current Voltage ◽  
Direct Current Voltage
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