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Journal articles on the topic '400Hz'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Cooper, Ronald C., and Evan C. Cooper. "400Hz High Speed Static Transfer Switch." SAE International Journal of Aerospace 1, no. 1 (2008): 946–65. http://dx.doi.org/10.4271/2008-01-2877.

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2

Wu, Di, Qi Jun Wu, and Rong Zhao Zhu. "A Compound Strategy to Optimize the Output Characteristics of Mid-Frequency Inverter." Applied Mechanics and Materials 380-384 (August 2013): 2999–3002. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.2999.

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To improve the stability and output voltage quality of inverter, an new repetitive control strategy for 400Hz Constant Voltage Constant Frequency (CVCF) inverter has been proposed . Based on active damping, this strategy damps the oscillations on the output LC filter of inverter under unload or light load. Using state-observer to weaken the impact of time delay in digital control, a 5.5 kW one-phase 400Hz inverter prototype by this strategy has been tested.The result shows that low THD (about 1.5%) with inductive loads and fast error convergence (2 fundamental periods) can be achieved by this

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3

Wang, Ze Ying, Dong Xing Wang, Yong Shuang Zhang, Yue Yue Wang, Jing Hua Yin, and Hong Zhao. "The Dynamic Characteristics of Al Gate CuPc Thin Film Transistor." Advanced Materials Research 981 (July 2014): 830–33. http://dx.doi.org/10.4028/www.scientific.net/amr.981.830.

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We have fabricated Au/CuPc/Al/CuPc/Au organic thin film transistor (OTFTs) using vacuum deposition with CuPc thin films of stable chemical property and semi conductive Al gate thin film electrode. The static and dynamic characteristics were tested at room temperature. The test results show that the switching speed of the OTFT is ton=2.68ms, toff= 1.32ms, amplification bandwidth is 400Hz, and the cutoff frequency fc=400Hz when inputting 100Hz small square wave signal. Our OTFT has submicron conductive channel, shows operation characteristics of high frequency, high speed and high current densit

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4

Maulana, Irmawan, and Nuryono Satya Widodo. "Sistem Pengolah Musik Sebagai Kontrol Gerak Robot Humanoid." Buletin Ilmiah Sarjana Teknik Elektro 1, no. 2 (2019): 46. http://dx.doi.org/10.12928/biste.v1i2.915.

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Pada Kontes Robot Seni Tari Indonesia (KRSTI), mengharuskan peserta untuk dapat membuat robot yang dapat menari secara otomatis dengan diiringi alunan musik. Tujuan penelitian ini adalah membuat robot humanoid yang dapat menari ketika musik pengiring diputar dan berhenti ketika musik berhenti. Penelitian ini menggunakan IC MSGEQ7 sebagai pengolah musik karena IC ini dapat membaca nilai frekuensi musik secara detail sebanyak tujuh frekuensi yaitu frekuensi 63Hz; 16Hz; 400Hz, 1kHz; 2,5kHz; 6,25kHz; dan 16kHz. Ketujuh frekuensi tersebut dijadikan acuan sebagai isyarat robot untuk bergerak atau be

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5

Pei, Su Ping, and Bi Rui Wu. "The Research and Implementation of the Mid-Frequency Power." Applied Mechanics and Materials 492 (January 2014): 439–42. http://dx.doi.org/10.4028/www.scientific.net/amm.492.439.

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This paper discusses the research and implementation of the mid-frequency power (MFP). The paper analyzes the present research situation and the existence question of 400Hz mid-frequency power supply. Then the research of full digital control realization process of mid-frequency power supply with high power factor and multiple closed-loop feedback (MCLF) is given. The principle and characteristic of the closed-loop control system are provided. Finally the experimental prototype taking DSP of TMS320F2812 type as control device is developed. The experimental results verify the rationality .

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6

Wang, Gui Xin, Shuai Zheng, Wen Juan You, Zhe Heng Zhou, and Yang Li. "The Simulation Research of 5KVA/400Hz Medium Frequency Power Supply in Matlab/Simulink." Applied Mechanics and Materials 668-669 (October 2014): 567–70. http://dx.doi.org/10.4028/www.scientific.net/amm.668-669.567.

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This paper built 5 KVA / 400 Hz medium frequency power supply AC - DC - AC main circuit, Output filter is designed in detail. Based on SPWM control strategy and the voltage RMS feedback loop and PI adjustment, the Matlab/Simulink simulation model is established, and Harmonics are analyzed, the conclusion is obtained.

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7

Meng, Ai Hua, Ming Fan Li, Jian Jun Zhou, and Yu Liang Pan. "Design and Analysis of Big-Character Printer." Advanced Materials Research 97-101 (March 2010): 2491–95. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.2491.

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The Big-character printer is a dot-matrix print equipment used in industry field. The print head is the key part of it. Sixteen jet valves are arranged in three lines alternated regular framework. Every valve is driven by giant magnetostractive actuator (GMA). The dynamic characters of valve body and GMA have been studied in the paper. The square wave response experiment shows that the valve bandwidth is more than 400Hz. The response plot has a good agreement with the simulation result. Meanwhile, the print dots are clear. Therefore, the BCP based on GMA could fulfill the requirement.

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8

Lv, Yang, Jun Hong Zhang, and Jing Hong Zhao. "A Single-Phase / Three-Phase Transformer Designed for Voltage Detection Unit of 400Hz Converter Excitation Regulator." Advanced Materials Research 1006-1007 (August 2014): 967–71. http://dx.doi.org/10.4028/www.scientific.net/amr.1006-1007.967.

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Design a single-phase / three-phase transformer designed for voltage detection unit of 400Hz frequency ship converter excitation regulator. Transformer has asimilar structure to AC motor, but the rotor is fixed, a single-phase AC power pass into the rotor and three-phase alternating current generated in the stator side. The transformer is used to the detection circuit of voltage regulator , so that the filter capacitor can be reduced, thereby reducing the latency of signal feedback and improve the response speed of the excitation regulator. The experimental results show that, the transformer h

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9

Joung, Seok-Eon, and Dong-Seok Hyun. "An Improved Synchronization Control Scheme of a Low Cost 400Hz Power Supply for No-Break Power Transfer." Transactions of the Korean Institute of Power Electronics 19, no. 5 (2014): 470–74. http://dx.doi.org/10.6113/tkpe.2014.19.5.470.

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10

Li, Miao, and Hui Bin Gao. "Research on Servo Controller for High Speed Tracking System." Applied Mechanics and Materials 65 (June 2011): 88–91. http://dx.doi.org/10.4028/www.scientific.net/amm.65.88.

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To meet requirement of swiftness and minimization for the tracking system as well as realize horizontal high accuracy tracking measurement, the automatic servo tracking measurement system has been designed. The two closed loop control, bisection method and compound control have been applied into the system. Experimental results show that the maximum tracking error can be limited to less than 0.5°and the regulator time can be 0.04s. The control project resonance frequency should be more than 200Hz and the sample frequency should be more than 400Hz to meet the control accuracy requirement. And t

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11

Wang, Yelin, та Hao Cai. "Design of an Ultra-Low Power CT ΣΔ A/D Modulator in 65 nm CMOS for Cardiac Pacemakers: From System Synthesis to Circuit Implementation". International Journal of Electronics and Telecommunications 60, № 1 (2014): 98–104. http://dx.doi.org/10.2478/eletel-2014-0013.

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Abstract A high performance, ultra-low power, fully differential 2nd-order continuous-time ΣΔ analogue-to-digital modulator for cardiac pacemakers is presented in this paper. The entire design procedure is described in detail from the high-level system synthesis in both discrete and continuous-time domain, to the low-level circuit implementation of key functional blocks of the modulator. The power consumption of the designed modulator is rated at 182 nA from a 1.2V power supply, meeting the ultra-low power requirement of the cardiac pacemaker applications. A 65 nm CMOS technology is employed t

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12

Pan, Gong Yu. "Development of High Precision Position Stage and its Performance." Applied Mechanics and Materials 229-231 (November 2012): 592–96. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.592.

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This paper presents a high precision position stage which has the movement range of 0.4 micrometer and 1 nanometer precision. The piezoelectric actuator stage is composed of vertical position control part and horizontal position control part. With the three vertical piezoelectric actuators and three horizontal piezoelectric actuators, the stage can adjust the position in three directions and three angles around. The simulation and experimental results show that the first natural frequencies of the stage in three directions are bigger than 400Hz with the 600kg load, which means that the system

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13

Fan, Sheng Wen, and Yun Zhao. "The Performance Optimization Design of High Frequency and High Voltage Transformer of Electronic Beam Welder." Advanced Materials Research 383-390 (November 2011): 7202–7. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.7202.

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High-frequency digital inverter power supply has the advantages of small, no noise, high efficiency, small ripp- le, and perfect protection, therefore, is gradually replacing the traditional electron beam welder which uses the 400Hz frequency generator. However, with more high frequency of the power supply, the design of the transformer used by the high-frequency high-voltage electron beam welding becomes difficult. Therefore, this paper put forward a diversified transformer mode and a voltage doubling rectifier circuit, which were used to reduce the transformer turns ratio, thus reducing the

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14

Yang, Chun Yan, Yun Hao, Bozhe Wang, Hai Yuan, and Liu Hui Li. "Effect of Laser Processing Parameters on Microhole Quality of Aluminium Nitride Ceramics." Key Engineering Materials 871 (January 2021): 277–83. http://dx.doi.org/10.4028/www.scientific.net/kem.871.277.

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A picosecond laser in spin-cutting mode was used to drill 500μm diameter microholes on 150μm thick aluminium nitride ceramic. The effects of laser processing parameters such as the laser power, scanning speed, and defocus amount on the microhole quality were studied. The results show that as the laser power increases, the inlet and outlet diameters of the holes increase, the taper decreases slightly, and the thickness of the recast layer decreases evidently. The scanning speed has no obvious effect on the diameter and taper of the hole; however, the hole can not be drilled through when the spe

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15

Hafez, Ahmed, and Ali Yousef. "Multi-Pulse Diode Rectifier for More-Electric Aircraft Applications: Parallel versus Series Topologies." Iraqi Journal for Electrical and Electronic Engineering 13, no. 1 (2017): 138–44. http://dx.doi.org/10.37917/ijeee.13.1.15.

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This article analyzes thoroughly the performance of the Multi-Pulse Diode Rectifiers (MPDRs) regarding the quality of input/output voltage and currents. Two possible arrangements of MPDRs are investigated: series and parallel. The impact of the DC side connection on the performance of the MPDRs regarding the operation parameters and rectifier indices are comprehensively examined. Detailed analytical formulas are advised to identify clearly the key variables that control the operation of MPDRs. Moreover, comprehensive simulation results are presented to quantify the performance and validate the

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16

Liu, Gang, Quan Zhi Yang, and Bao Sheng He. "Field Test of Wellbore Anti-Collision Monitoring System." Advanced Materials Research 605-607 (December 2012): 744–49. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.744.

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Avoiding well collision has become an increasingly critical challenge for the drilling industry in recent years. The wellbore Anti-collision Monitoring system is developed because the vibrations caused by an approaching drill bit can be monitored from the existing well casing and used to pre-alarm the wellbore collision. By analyzing the time-domain signal collected by the system in different drilling conditions, the influences of the drilling parameters (RPM and WOB) on drill bit signal are identified; and by analyzing the frequency-domain signal, the characteristic frequency range (200-400Hz

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17

Tao, Ye, Shou Fu Geng, and Hou Wei Lian. "Dumping Tags Based on Active RFID." Advanced Materials Research 215 (March 2011): 29–32. http://dx.doi.org/10.4028/www.scientific.net/amr.215.29.

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In view of the problems that Security personnel who faced with an emergency response can not be timely in the process of duty, we propose and establish a monitoring system based on active RFID technology. The system uses active RFID Reader and the communication protocol between Reader and the host computer to monitor the status of security personnel. Tag’s configuration allows more flexible application of the tag and we can use the configuration to change the parameters of the tag. The tag's size is small and it has flexible applicability and strong adaptability. Test results showed that the t

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18

Zhang, Wen Bin, and Hong Juan Ge. "A Novel Control Strategy Based on Virtual dc Voltage Feedback for an Improved Three-Phase to Single-Phase Matrix Converter." Applied Mechanics and Materials 291-294 (February 2013): 2452–58. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.2452.

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This paper presents an improved topology for three-phase to single-phase matrix converter (3-1 MC), and discusses the power decoupling method, closed-loop control strategy, etc. These studies make the single-output MC have good features, such as sinusoidal input current, low total harmonic distortion (THD), compensating the shortcomings of traditional 3-1 MC caused by the output power pulsation. According to the improved scheme, a novel closed-loop control strategy based on virtual dc voltage feedback is proposed. The strategy completes the closed-loop control of 3-1 MC by taking the virtual d

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19

Khalid, Saifullah, Anurag Tripathi, and V. M. Mishra. "Comparison of Constant Instantaneous Power Control & Synchronous Rotating Frame Strategy for Total Harmonic Reduction in Aircraft System (400Hz)." Advanced Materials Research 768 (September 2013): 287–97. http://dx.doi.org/10.4028/www.scientific.net/amr.768.287.

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Two different control strategies for extracting reference currents for shunt active power filters have been evaluated and their performances have been compared under various non linear loads. Comparison of the compensation ability of different control strategies based on THD and speed will be done and suggestions will be given for the selection of strategy to be used under different load. The simulated results using MATLAB model are presented and they will clearly prove the effectiveness of the proposed control method of aircraft shunt APF.

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20

Binkowski, Tomasz. "A Conductance-Based MPPT Method with Reduced Impact of the Voltage Ripple for One-Phase Solar Powered Vehicle or Aircraft Systems." Energies 13, no. 6 (2020): 1496. http://dx.doi.org/10.3390/en13061496.

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This paper presents a novel maximum power point tracking method for photovoltaic inverters with a single phase connection to the onboard 400Hz vehicle or aircraft grid, supplying drives operating in a critical mode. By taking into account that the power fluctuations cause voltage ripples at the termini of photovoltaic panels connected to the DC-link capacitor, this paper proposes a conductance base maximum power point tracking method. The impact of varying voltage has been reduced to ensure the constant reference current for the grid current calculation problem, which has been reported in prev

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21

Yin, Jing Hua, Shu Ting Gao, and Ming Hua Chen. "The Stress Distribution and Influence of VDMOS Device Based on ANSYS." Advanced Materials Research 981 (July 2014): 936–39. http://dx.doi.org/10.4028/www.scientific.net/amr.981.936.

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In this paper, the device of VDMOS packaged in a TO-220C power is acted as research object. ANSYS finite element software simulation is used to build the three dimension model, the software is also used to imitate the stress distribution under the frequency of 220Hz ~ 400Hz. The simulation result shows that the stress of the chip of corresponding to the empty space is bigger than the others as the increasing frequency on the boundary of bonding layer and the chip, which easily leads to micro deformation of the bonding layer and the micro crack of the chip. The value of stress effects by changi

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22

LI, Jing, Zhiying MA, Jianming LI, and Lizhan XU. "Arc Erosion of Silver/Tungsten Contact Material under Low Voltage and Small Current and Resistive Load at 400Hz and 50Hz." IEICE Transactions on Electronics E94-C, no. 9 (2011): 1356–61. http://dx.doi.org/10.1587/transele.e94.c.1356.

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23

Pearson, Matthew R., Mark J. Eaton, Eszter Szigeti, et al. "Damage Detection in Composite Materials Using Airborne Acoustics." Key Engineering Materials 569-570 (July 2013): 72–79. http://dx.doi.org/10.4028/www.scientific.net/kem.569-570.72.

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Composite materials are increasingly being used in a wide range of structural applications in place of metallic materials. This presents a new range of challenges when considering the monitoring of damage and failure in complex components. This paper explores these challenges and presents a potential monitoring method using airborne acoustics which is both non-contact and easily implemented. A carbon composite panel was manufactured and statically loaded in tension until failure. During the test, Digital Image Correlation (DIC) was used to measure full field surface strain in the panel. An arr

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24

Wang, Shi Bin, Cheng Bo Yu, Lin Du, Cai Xin Sun, and Jia Yang. "Response Sensitivity of Faraday Magneto-Optical Effects of Ferrofluid." Materials Science Forum 663-665 (November 2010): 1221–24. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.1221.

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The transmitted intensity and the modulation depth of plane polarized light are implemented to investigate influences of the low frequency external magnetic field on the ferrofluid film. The frequency of AC magnetic field is modulated from 5Hz to 400Hz, and the thickness of ferrofluid films are changed as 12 μm, 25 μm, 140 μm and 520 μm, and the mass concentration of magnetic nanoparticles is 5 %, 10 %, 20 % and 33.6 %, respectively. The experimental results show that (1) the mean value of the optical transmittance of ferrofluid film is decided by the thickness of ferrofluid film and the mass

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25

Sadeghi, Maryam, and Majid Gholami. "Intelligent Universal Transformers Online Adaptive Control via Artificial Neural Network." Advanced Materials Research 433-440 (January 2012): 3923–28. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.3923.

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Adaptive control is a novel methodology introducing for dynamic identification and control of nonlinear system in case of unknown parameters and absence of precise mathematical model. The Artificial Neural Networks (ANNs) suggest the parallel algorithm in resolving paradigms and result on a robust control fashion in which learning algorithm resembling to the biological brain. Back propagation algorithm is proposed for updating the ANN weighting factors through the on line learning procedure. This research is carry out to investigate the ANN trained algorithm to elaborate the switching angle si

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26

Sadeghi, Maryam, and Majid Gholami. "Robust Adaptive Fuzzy Logic Controllers for Intelligent Universal Transformers in ADA." Advanced Materials Research 403-408 (November 2011): 5038–44. http://dx.doi.org/10.4028/www.scientific.net/amr.403-408.5038.

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Intelligent Universal Transformer (IUT) will comprise in Advanced Distribution Automation (ADA) with a new invention in control and management in future. It evolves with a high speed traditional transformer in addition to power electronic base construction will eventuate to oil elimination, dimensional size and weight reduction. Adaptive Fuzzy Logic Control (AFLC) is an adaptive progressed method with the high system performance capability being raised even on the uncertainty conditions. It enhances system stability, improves flexibility and releases designers from precise mathematical model u

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27

Spyropoulos, B., and M. Maragkos. "A Low Cost Ionizing Radiation Monitoring System." HNPS Proceedings 7 (December 5, 2019): 221. http://dx.doi.org/10.12681/hnps.2421.

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It was aim of this project the development of a low - cost system, managing signals coming - out of several detectors (ionization chambers, Nal - detectors, Geiger - Mueller etc.) installed in different areas, monitoring radiation levels. The output of such detectors is a spike - like waveform, that may be introduced to a Schmitt - trigger, producing equal frequency quadratic pulses, that are counted. Alternatively, the output may be introduced to an amplified waveform V(t), corresponding to the monitored rate, will be digitized through a PCL - 812PG A/D I/O card and introduced to a PC (at lea

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28

Krishnamani, Divya Bharathi, P. A. Karthick, and Ramakrishnan Swaminathan. "VARIATION OF INSTANTANEOUS SPECTRAL CENTROID ACROSS BANDS OF SURFACE ELECTROMYOGRAPHIC SIGNALS." Biomedical Sciences Instrumentation 57, no. 2 (2021): 356–60. http://dx.doi.org/10.34107/yhpn9422.04356.

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Surface electromyography (sEMG) is a technique which noninvasively acquires the electrical activity of muscles and is widely used for muscle fatigue assessment. This study attempts to characterize the dynamic muscle fatiguing contractions with frequency bands of sEMG signals and a geometric feature namely the instantaneous spectral centroid (ISC). The sEMG signals are acquired from biceps brachii muscle of fifty-eight healthy volunteers. The frequency components of the signals are divided into low frequency band (10-45Hz), medium frequency band (55-95Hz) and high frequency band (95-400Hz). The

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29

Zhang, Jin Qiu, Jie Yue, Lei Zhang, Jin Feng Jia, and Zhi Zhao Peng. "Design of Magnetorheological Damper Control System for Vehicle Suspension." Applied Mechanics and Materials 278-280 (January 2013): 1436–41. http://dx.doi.org/10.4028/www.scientific.net/amm.278-280.1436.

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The damping force of Magnetorheological damper (MRD) can be controlled in a certain range by applying a steady magnetic field to reduce vehicle suspension vibration effectively. This paper presents the analysis of the damping characteristics of the twin-tube MRD, and the design of embedded control system for Twin-tube MRD used to semi-active vehicle suspension. The laws of varying damp force with current, displacement and frequency are investigated by testing for the damper, for instance the relationship curve of damping force vs. current. The control system is composed of controllable current

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Salehi, Mohsen, Hooshang Heshmat, and James F. Walton. "Advancements in the Structural Stiffness and Damping of a Large Compliant Foil Journal Bearing: An Experimental Study." Journal of Engineering for Gas Turbines and Power 129, no. 1 (2004): 154–61. http://dx.doi.org/10.1115/1.2360598.

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This paper presents the results of an experimental investigation into the dynamic structural stiffness and damping characteristics of a 21.6‐cm(8.5in.)-diameter compliant surface foil journal bearing. The goal of this development was to achieve high levels of damping without the use of oil, as is used in squeeze film dampers, while maintaining a nearly constant dynamic stiffness over a range of frequencies and amplitudes of motion. In the experimental work described herein, a full compliant foil bearing was designed, fabricated, and tested. The test facility included a non-rotating journal loc

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31

Alabi, A. B., T. Akomolafe, J. A. Ajao, N. Coppede, O. A. Babalola, and A. E. C. Ihekwaba. "Development of Vernonia Amygdalina Photosynthetic Membraneless Electrochemical Cell." Journal of New Materials for Electrochemical Systems 16, no. 1 (2012): 33–40. http://dx.doi.org/10.14447/jnmes.v16i1.44.

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Experimental analyses of Vernonia amygdalina pigment from plant collected in Ilorin, Nigeria, have been carried out using spectrophotometer, 1H nuclear magnetic resonance (400Hz) and X-ray diffractometer. Biological membraneless electrochemical cells were fabricated using ground hydrated chlorophyll containing tissues.  The cells were assembled by compaction of hydrated pigment housed in an air-tight 6.5 cm3 cylindrical container, with similar electrodes of copper material. Experimental results showed that the visible part of the electromagnetic spectrum is strongly absorbed at 412

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Dong, Ren G., John Z. Wu, Daniel E. Welcome, and Thomas W. McDowell. "Estimation of Vibration Power Absorption Density in Human Fingers." Journal of Biomechanical Engineering 127, no. 5 (2005): 849–56. http://dx.doi.org/10.1115/1.1992526.

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The absorption of hand-transmitted vibration energy may be an etiological factor in vibration-induced disorders. The vibration power absorption density (VPAD) may be a better measure of energy than the total power absorption of the hand-arm system. The objectives of the present study are to develop a method to estimate the average absorption density in the fingers and to investigate its basic characteristics. Ten healthy male subjects were used in this study. The biodynamic response of the fingers in a power grip subjected to a broad-band random excitation was measured under three grip forces

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Sadeghi, Maryam, and Majid Gholami. "Developing Adaptive Neuro-Fuzzy Inference System for Controlling the Intelligent Universal Transformers in ADA." Advanced Materials Research 433-440 (January 2012): 3969–73. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.3969.

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This approach is carry out for developing the Adaptive Neuro-Fuzzy Inference System (ANFIS) for controlling the forthcoming Intelligent Universal Transformer (IUT) in regard of voltages and current control in both input and output stages which is optimized by particle swarm optimization. Current or voltages errors and their time derivative have been considered as the inputs of Nero Fuzzy controller for elaborating the firing angles of converters in IUT basic construction. ANFIS constructed from a fuzzy inference system (FIS) in which the membership function parameters are tuned according to th

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Liu, Chia Ju, Chin Fei Huang, Chia Yi Chou, et al. "The Influence of 40 Hz Electromagnetic Wave Induce Phase-Synchronization on Brain." Applied Mechanics and Materials 311 (February 2013): 491–96. http://dx.doi.org/10.4028/www.scientific.net/amm.311.491.

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Auditory phase-synchronization near 40Hz is reportedly related to sensory stimulation. This study applied the phase synchrony analysis and Bi-coherence analyses to analyze the electroencephalographic measurements. Four experimental stages were conducted with 34 healthy high school students to collect the data: (A) resting with eyes closed, (B) listening to the classical music, (C) resting with eyes closed, and (D) listening to popular music. The result shows that the whole brain phase-synchronization occurs at 40Hz and lasts about 400 ms, which is quite different from the estimated 40Hz phase-

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Tang, Ding Kang, Jian Guo Zhang, and Yuan Shan Liu. "All-Fiber 40GHz Femtosecond Pulse Train Source." Advanced Materials Research 529 (June 2012): 169–72. http://dx.doi.org/10.4028/www.scientific.net/amr.529.169.

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We experimentally demonstrate an all-fiber method to generate a high-quality femtosecond pulse train with a repetition rate of 40GHz. A continuous wavelength laser together with an intensity modulator is used to generate an initial pulse train with a repetition rate of 40GHz. Highly nonlinear fiber (HNLF) together with single mode fiber is utilized to compress the initial pulse from 7.8ps to 985fs. The autocorrelation trace has a good sech 2 profile with no pedestal. This pulse source has a potential to be multiplexed to a higher repetition rate for its narrow pulse width. This method is high-

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SUMIKAWA, Hiromi, Ei-ichiro SUZUKI, and Nobuya NAGASHIMA. "400MHz H-NMR spectra of amino acids." Journal of the Spectroscopical Society of Japan 37, no. 3 (1988): 185–200. http://dx.doi.org/10.5111/bunkou.37.185.

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Teng, Yue, Jian Min Gao, and Chang Jian Liu. "Development of Droplets Penetrating Roots Performance Test Device and Tests Applied this Device in Ultrasonic Aeroponic System." Applied Mechanics and Materials 680 (October 2014): 288–91. http://dx.doi.org/10.4028/www.scientific.net/amm.680.288.

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Extremely flourishing roots of aeroponic plant lead droplets difficult to penetrate into the core of roots. This phenomenon is so-called “external is wet but internal is dry” and seriously affects areoponic efficiency, even result in aeroponic culture failure. In order to research droplets penetrating roots performance in ultrasonic aeroponic system, an intelligent test device was developed. This device included two ultrasonic nozzles whose working frequencies were 1.7MHz and 40kHz respectively, nozzles’ drive circuit, acquisition system of humidity and temperature based on ARM 9.0 and axial f

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Gao, Yang, Ying Duan Chen, Shi Wei Xi, Ying Bin Zheng, and Chao Zhang. "Development of the 400MHz Power Durable SAW Filter." Key Engineering Materials 483 (June 2011): 381–86. http://dx.doi.org/10.4028/www.scientific.net/kem.483.381.

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Rapid development of wireless communication system requires high frequency and high power surface acoustic wave (SAW) filter. For SAW RF MEMS devices on diamond film, they have higher working frequency and more power endurance. A SAW RF MEMS filters on diamond film is designed. Its center frequency is 400MHz, and the line width of its Inter Digital Transducer (IDT) is 5μm. The diamond film on silicon substrate is customized by the CAEP ultra-hard material Co. 2μm thick ZnO piezoelectric film is deposited on diamond film by RF sputtering method. XRD analysis shows that the ZnO film has good C-a

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Frost, Elizabeth A. M. "Monitoring of Stimulus-Induced 40Hz Brain Oscillations." Journal of Neurosurgical Anesthesiology 11, no. 3 (1999): 223. http://dx.doi.org/10.1097/00008506-199907000-00022.

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&NA;. "Ionic basis for intrinsic 40Hz neuronal oscillations." NeuroReport 5, no. 4 (1994): 531. http://dx.doi.org/10.1097/00001756-199401120-00044.

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Kamei, Toshihisa, Yozo Utsumi, and Nguyen Thanh. "The 40GHz band duplexer with E-plane planar circuit." IEICE Electronics Express 4, no. 17 (2007): 549–54. http://dx.doi.org/10.1587/elex.4.549.

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Filho, E. Santos, Y. Saijo, A. Tanaka, T. Yambe, and M. Yoshizawa. "Fractal dimension of 40MHz intravascular ultrasound radio frequency signals." Ultrasonics 48, no. 1 (2008): 35–39. http://dx.doi.org/10.1016/j.ultras.2007.08.006.

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Zimbran, Adela. "Evaluation of Periodontal Tissues Using 40MHz Ultrasonography. Preliminary report." Medical Ultrasonography 15, no. 1 (2013): 6–9. http://dx.doi.org/10.11152/mu.2013.2066.151.az1ept2.

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Li, P. Y., Qiang Liu, Wu Run An, and Shu Juan Li. "Finite Element Simulation of Ultrasonic Incremental Forming." Materials Science Forum 836-837 (January 2016): 452–61. http://dx.doi.org/10.4028/www.scientific.net/msf.836-837.452.

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This paper briefly describes the principle of the ultrasonic single point incremental forming of the sheet metal. In which we established the finite element model and finished the finite simulation with ABAQUS. According to the simulation result, we analyzed the influence law of vibration frequency of the axis on the distribution of the stress and strain of the sheet metal, the thickness, and the axial force in the process of ultrasonic single point incremental forming of the sheet metal. The result shows that the influence on the stress and thickness of the sheet metal is minimal, and the inf

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Nan, Qiu, and Fan Yin Hai. "Digital Controlled High Power Mid-Frequency Pulsed Power Supply." Advanced Materials Research 108-111 (May 2010): 1332–37. http://dx.doi.org/10.4028/www.scientific.net/amr.108-111.1332.

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In this article a novel scheme of high power mid-frequency pulse power supply is proposed. The supply is made up of two major stages. First stage is dual interleaved buck chopper stage in order to make the DC bus and output pulse voltage controllable. Second stage is a inverter converting the DC voltage into a series of square AC voltage pulse. IGBT module(300A-1200V) is used as the main switch device for the proposed supply is a high power application. As we know large capacity power IGBT module can hardly work as high as 40Khz[1], so to solve this problem, interleaved control scheme is incor

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Yousefi, M., D. Koozehkanani, H. Jangi, N. Nasirzadeh, and J. Sobhi. "A –5 dBm 400MHz OOK Transmitter for Wireless Medical Application." International Journal of Electronics and Telecommunications 60, no. 2 (2014): 193–98. http://dx.doi.org/10.2478/eletel-2014-0024.

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Abstract A 400 MHz high efficiency transmitter for wireless medical application is presented in this paper. Transmitter architecture with high-energy efficiencies is proposed to achieve high data rate with low power consumption. In the on-off keying transmitters, the oscillator and power amplifier are turned off when the transmitter sends 0 data. The proposed class-e power amplifier has high efficiency for low level output power. The proposed on-off keying transmitter consumes 1.52 mw at -5 dBm output by 40 Mbps data rate and energy consumption 38 pJ/bit. The proposed transmitter has been desi

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Zhao, Xia. "Inset-Fed Patch Antenna for LTE Application." Applied Mechanics and Materials 130-134 (October 2011): 4020–23. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.4020.

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In this paper, a rectangle patch antenna at 2.53GHz is designed for LTE system. In order to acquire the desired center frequency, width of the conductor in the antenna is adjusted before and after impedance matching. At last, the patch antenna get 2.96dB gain and VSWR less than 1.8 during bandwidth of 40MHz.

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Kim, Hyun Ji, and Sung Hoon Kim. "Comparative Investigation into the Electromagnetic Wave Shielding Effectiveness of Different Type Carbon-Based Fabrics." Key Engineering Materials 803 (May 2019): 81–87. http://dx.doi.org/10.4028/www.scientific.net/kem.803.81.

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Different type carbon-based fabrics, namely woven or nonwoven fabric, were employed to investigate the electromagnetic wave shielding effectiveness of the fabrics in the wide operating frequency range, namely 0.4GHz to 40GHz. The surface and cross sectional morphologies of the fabrics, their electrical conductivities, and their electromagnetic wave shielding effectiveness were investigated. In the case of woven fabric, the value of the electrical conductivity was much different according to the measuring direction in the woven fabric. For the nonwoven fabric, however, this value was independen

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Nasrulloh, Mohammad Dicky. "Designing a Digital Filter Based Crossover Audio System Using STM32L4." Jurnal Jartel: Jurnal Jaringan Telekomunikasi 9, no. 4 (2019): 13–18. http://dx.doi.org/10.33795/jartel.v9i4.141.

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Analog telecommunication system equipment is now starting to develop and be replaced with digital telecommunication systems, one of them is in the audio signal processing. The focus of audio processing is audio crossover. Audio crossover in development there are still many who use analog systems. This analog system has disadvantages when adjusting the sound balance because it still uses analog filters to balance it. It is necessary to develop a technology that aims to create a digital-based crossover audio system using the STM32L4, so that by using this digital-based signal processing it is ab

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Aoyagi, Masaru, Masaki Yokota, Jiro Harada, and Yosio Koike. "Clinical application of 40Hz event related potential for audiometry." AUDIOLOGY JAPAN 29, no. 2 (1986): 108–16. http://dx.doi.org/10.4295/audiology.29.108.

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