Results 1 to 10 of about 17,793 (302)
مجلة علوم ذي قار, 2019 Chopper is an important component in optical system. It represents a device, which changes the angle between the coordinate and vision lines of the target for the electrical signal. The chopper modulates the optical signal by a frequency dependent on the
Mohammed L. Jabbar +1 more
doaj +2 more sources
Reactive compensation scheme of three phase unbalance based on AC chopper device
Gong-kuang zidonghua, 2013 The paper proposed a scheme of using AC chopper device to compensate three phase unbalanced system dynamically and gave the device structure. The simulation result verified that the AC chopper device can adjust output voltage by changing duty ratio, and ...
CHENG Shun-zu, GUO Xi-jin, LI Su-ying
doaj
Auto-Phase-Locked Time-Resolved Luminescence Detection: Principles, Applications, and Prospects
Frontiers in Chemistry, 2020 Time-resolved luminescence measurement is a useful technique which can eliminate the background signals from scattering and short-lived autofluorescence. However, the relative instruments always require pulsed excitation sources and high-speed detectors.
Qisheng Deng, Zece Zhu, Xuewen Shu
doaj +1 more source
Speed/Torque Estimation and Control of a DC Machine in Four Quadrants Operation Modes
مجلة النهرين للعلوم الهندسية, 2018 Transfer function characteristics of a DC machine are used in this paper to estimate speed and torque in four quadrant operation modes. Estimation speed and torque control based on a DC machine transfer function is implemented by measuring the DC ...
Rakan Khalil Antar
doaj +1 more source
Influence of Crowbar and Chopper Protection on DFIG during Low Voltage Ride Through
Energies, 2018 The energy sector is evolving rapidly, namely due to the increasing importance of renewable energy sources. The connection of large amounts of wind power generation poses new challenges for the dynamic voltage stability analysis of an electric power ...
Rita M. Monteiro Pereira +3 more
doaj +1 more source
EngFor high-voltage signal detection applications, an auto-zero and chopper operational amplifier (OPA) is proposed in this paper. With the auto-zero and chopper technique, the OPA adopts an eight-channel Ping-Pong mechanism to reduce the high-frequency ...
Zhifeng Chen +3 more
doaj +1 more source
Research on Beam Pulsing Technology of Low Energy Beam Transport Line for Proton Linear Accelerator
Yuanzineng kexue jishuBeam pulsing technology serves as a critical methodology in modern accelerator systems, offering substantial improvements in beam quality enhancement, time-resolved measurement capabilities, space charge effect mitigation, and operational flexibility ...
QIN Cheng, YANG Yu, YANG Jinghe, WANG Changqiang, LI Liang, LYU Yuepeng, ZHU Zhibin, WANG Guobao
doaj +1 more source
Oftalʹmologiâ, 2018 Objective: Comparative analysis of the results of phacoemulsification (FEC) with the use of developed and classic technologies for fragmentation of the lens nucleus in patients with pseudoexfoliation syndrome (PES). Patients and methods.
V. M. Malov +4 more
doaj +1 more source
THE LOWER PALEOLITHIC INDUSTRY OF ANKHE IN VIETNAM WITH THE SO-CALLED MOVIUS LINE
Tạp chí Khoa học Đại học Đà Lạt, 2019 From 2014 to 2019, four of 23 Lower Paleolithic sites were excavated by a joint Vietnamese - Russian team of archaeologists in Ankhe town, Gialai province. The An Khe industry is characterized by a collection of stone tools made of local river and stream
Nguyễn Khắc Sử
doaj +1 more source
A Low-Noise Direct Incremental A/D Converter for FET-Based THz Imaging Detectors
Sensors, 2018 This paper presents the design, implementation and characterization results of a pixel-level readout chain integrated with a FET-based terahertz (THz) detector for imaging applications. The readout chain is fabricated in a standard 150-nm CMOS technology
Moustafa Khatib, Matteo Perenzoni
doaj +1 more source