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1
Zhang, Peng, Hou Jun Wang, Li Li, and Ping Wang. "Design and Implementation of Intermediate Frequency Generation and Analysis Module for Avionics Test." Advanced Materials Research 1049-1050 (October 2014): 1147–53. http://dx.doi.org/10.4028/www.scientific.net/amr.1049-1050.1147.
Повний текст джерелаАнотація:
To test airborne avionics device, it is necessary to provide signal stimulus for the device under test (DUT) to simulate the real work environment. This paper proposes a hardware module which used to signal generate and analyze. The hardware structure and diagram of logic design are described. The generated waveforms and measurement results are presented. This test module combined with other necessary modules can achieve the test of L band airborne avionics such as ATC, TCAS and TACAN.
2
Li, Chang You, Gui Rong Ye, and Quan Fa Yang. "Design of Flight Data Signal Generator System." Applied Mechanics and Materials 556-562 (May 2014): 5143–47. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.5143.
Повний текст джерелаАнотація:
Aiming at the problem that flight data recorder taken aircraft directly as testing signal resource in the process of development and debugging of the flight data recorder is very difficult, the flight data signal generator based on embedded system is designed, which purpose is to simulate the status signal of aircraft and each component of aircraft during flight, providing test signal source for flight data recorder. Interactive interface was designed on PC by LabVIEW, which was used for setting parameter values of each signal; STM32 microcontroller received the parameter value and controlled each generating module to generate electric signal. All generating modules link with the Bus network, and the network will be easy to increase or decrease generating module. Experiment results show that the flight data signal generating system can simultaneously generate 138 signals, including analog, digital, synchronous, frequency, ARINC429 bus signals etc, and can work stably.
3
Chao, Kuei-Hsiang, and Pei-Lun Lai. "A Fault Diagnosis Mechanism with Power Generation Improvement for a Photovoltaic Module Array." Energies 14, no. 3 (January 25, 2021): 598. http://dx.doi.org/10.3390/en14030598.
Повний текст джерелаАнотація:
This paper aims to develop an online diagnostic mechanism, doubling as a maximum power point tracking scheme, for a photovoltaic (PV) module array. In case of malfunction or shadow event occurring to a PV module, the presented diagnostic mechanism is enabled, automatically and immediately, to reconfigure a PV module array for maximum output power operation under arbitrary working conditions. Meanwhile, the malfunctioning or shaded PV module can be located instantly by this diagnostic mechanism according to the array configuration, and a PV module replacement process is made more efficient than ever before for the maintenance crew. In this manner, the intended maximum output power operation can be resumed as soon as possible in consideration of a minimum business loss. Using a particle swarm optimization (PSO)-based algorithm, the PV module array is reconfigured by means of switch manipulations between modules, such that a load is supplied with the maximum amount of output power. For compactness, the PSO-based online diagnostic algorithm is implemented herein using a TMS320F2808 digital signal processor (DSP) and is experimentally validated as successful to identify a malfunctioning PV module at the end of this work.
4
Duan, Feng Yang, Li Min Chang, and Ye Zhan. "Realization of the Detecting Method for Aircraft Digital Image Transmission System Based on Multi-Processor." Advanced Materials Research 490-495 (March 2012): 2352–56. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.2352.
Повний текст джерелаАнотація:
The technologies of image block, pyramid and multi-threading were used in this program to design the high-speed image generation display module and the processes of image data scheduling and mapping and solve the problems of large-capacity image data modeling and high-speed displaying. The technology of direct digital frequency synthesis (DDS) was used to design the Doppler shifting signal generation module and the multi-processor parallel system architecture, which can analog the Doppler frequency shifting of the data communication signals and solve the problem of the authenticity of communication signals during the simulated flight.
5
Lu, Zhihai, Zhaoxiang Li, and Lei Zhang. "Physiological Index Monitoring of Wearable Sports Training Based on a Wireless Sensor Network." Journal of Sensors 2021 (December 6, 2021): 1–10. http://dx.doi.org/10.1155/2021/7552510.
Повний текст джерелаАнотація:
According to the development needs of wireless sensor networks, this paper uses the combination of embedded system and wireless sensor network technology to design a network node platform. This platform is equipped with a sports training sensor module to measure the physiological indicators of the ward in real time. The network node sends the collected physiological parameters to a remote monitoring center in real time. First, according to the generation mechanism of the physiological index signal and the characteristics of the physiological index signal, the wireless sensor network analysis and processing method are used to denoise the physiological index signal, and the wireless sensor network package is used to extract the characteristics of the physiological index, indicating different types of respiration. The energy characteristics of the sound physiological index signals are different, which verifies the feasibility of the independent component analysis method for separating the physiological index and the physiological index signal of the heart sound. Secondly, the hardware system of physiological index signal acquisition is designed, and the selection principle of the hardware unit is introduced. At the same time, the system structure of the monitor is designed, and then, the wireless sensor network sensor node is researched, the hardware of the wearable monitor system is designed, and the hardware architecture and working mode based on the single-chip MSP430F149 are given. Finally, the wireless hardware platform includes the following main modules: sensor part, preprocessing circuit module, microprocessing module based on MSP430 low power consumption, wireless transceiver module based on RF chip CC2420, and power supply unit used to provide energy.
6
Li, Dang, Jun Lu Wang, Yong Li, Jian Hua Li, and Pin Rong Lin. "A Preliminary Study on CSAMT Anti-Jamming Transmitter System." Advanced Materials Research 962-965 (June 2014): 317–21. http://dx.doi.org/10.4028/www.scientific.net/amr.962-965.317.
Повний текст джерелаАнотація:
On the basis of the relevant identification theory of pseudo-random code signal, the signals of CSAMT are divided into three parts according to the frequency of the signal. The signals which are susceptible to 50Hz interference signal and its harmonic components should be set by pseudo-random code way. Others are set by single square waveform way. The Control and signal generation software of the transmitter system is built on the advanced virtual instrument platform, LabVIEW. The hardware of the transmitter system is mainly composed of host computer, data acquisition card, high-speed optocoupler, IGBT driver module and four IGBT switches. The data acquisition card generate PWM signals, the high-speed optocoupler isolates low-voltage part and high-voltage part. IGBT drive module and four IGBT switches constitute high-voltage part. Entire transmitter system is suitable for different environments and research tasks, the transmit frequency are adjustable, and the pseudo-random code signal has strong capability to suppress the interference signals. The control software on host computer is simple and clear. There is good prospect for the use.
7
Zhao, Huayu. "Design and Application of Human Movement Respiratory and ECG Signal Acquisition System." Journal of Medical Imaging and Health Informatics 10, no. 4 (April 1, 2020): 890–97. http://dx.doi.org/10.1166/jmihi.2020.2950.
Повний текст джерелаАнотація:
To realize the design of mobile phone human movement breathing and electrocardiograph (ECG) signal acquisition system based on Bluetooth transmission, the principle of the generation and detection of ECG and respiratory signal and the guide system of signal acquisition are analyzed. Additionally, the hardware of the system is designed, including the hardware of the signal acquisition system, the design of ADS1292R ECG and respiratory signal acquisition module, the design of the main control chip and the design of the Bluetooth module. Then, the digital filtering processing of the ECG and respiratory signals is completed, including the baseline drift filtering and the suppression of the power frequency interference. The results show that the monitoring system runs well and it can effectively collect ECG and respiratory signals, calculate heart rate and respiratory frequency in real time, and display ECG waveform in real time. To sum up, the monitoring system is of great significance for real-time monitoring of the patient's condition.
8
Ling, Bowen, and Ilenia Battiato. "Module-Fluidics: Building Blocks for Spatio-Temporal Microenvironment Control." Micromachines 13, no. 5 (May 14, 2022): 774. http://dx.doi.org/10.3390/mi13050774.
Повний текст джерелаАнотація:
Generating the desired solute concentration signal in micro-environments is vital to many applications ranging from micromixing to analyzing cellular response to a dynamic microenvironment. We propose a new modular design to generate targeted temporally varying concentration signals in microfluidic systems while minimizing perturbations to the flow field. The modularized design, here referred to as module-fluidics, similar in principle to interlocking toy bricks, is constructed from a combination of two building blocks and allows one to achieve versatility and flexibility in dynamically controlling input concentration. The building blocks are an oscillator and an integrator, and their combination enables the creation of controlled and complex concentration signals, with different user-defined time-scales. We show two basic connection patterns, in-series and in-parallel, to test the generation, integration, sampling and superposition of temporally-varying signals. All such signals can be fully characterized by analytic functions, in analogy with electric circuits, and allow one to perform design and optimization before fabrication. Such modularization offers a versatile and promising platform that allows one to create highly customizable time-dependent concentration inputs which can be targeted to the specific application of interest.
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Yu, Liu. "Circuit Design of Electronic Igniter of MCU Used in Biogas Power Generation." Advanced Materials Research 986-987 (July 2014): 1775–79. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1775.
Повний текст джерелаАнотація:
According to the technical requirement of biogas power generation system, introducing the working principle of electronic igniter which is controlled by MCU; Designing and developing the electronic igniter which used STC 89 C-52 RC MCU as the core;Having completed the hardware circuit designs of power supply module, main control module and ignition module of electronic igniter. After testing the signal of circuit, it meets the technical requirements of biogas power generation system.
10
Lu, Xu Guang, Ji Hua Tian, Xiao Han, and Jin Ping Sun. "A High Bandwidth Signal Generation System Based on FPGA." Applied Mechanics and Materials 198-199 (September 2012): 1743–47. http://dx.doi.org/10.4028/www.scientific.net/amm.198-199.1743.
Повний текст джерелаАнотація:
A Wideband Signal Generation System for radar and Electronic Warfare is presented. This system uses two DACs each can work at 1Gsps with 14-bit resolution and generate 500MHz bandwidth signal. The DDWS (Direct digital wave synthesis) method is used for signal generation and the data transfer and controlling is based on FPGA. The data for signal generation is stored in ZBT-SRAM and the system can communicate with the controller module through PC104+ interface. The system structure, implementation and test results are described in detail.
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Qi, Jian, Qun Sun, Xiaoliang Wu, Chong Wang, and Linlin Chen. "Design and Analysis of a Low Cost Wave Generator Based on Direct Digital Synthesis." Journal of Electrical and Computer Engineering 2015 (2015): 1–17. http://dx.doi.org/10.1155/2015/367302.
Повний текст джерелаАнотація:
Signal generators are widely used in experimental courses of universities. However, most of the commercial tests signal generators are expensive and bulky. In addition, a majority of them are in a fixed working mode with many little-used signals. In order to improve this situation, a small sized and highly accurate economic signal generator based on DDS technology has been developed, which is capable of providing wave signals commonly used in experiments. Firstly, it is introduced the basic principles of DDS and is determined the overall scheme of the signal generator. Then, it proposes a design of the hardware, which include power supply module, display module, keyboard module, waveform generating module based on DDS chip, and the minimum system module based on C8051F010. The signal generator was designed to output sine and square waveforms, and the other achieved performances included the frequency range 0.1 Hz–12.5 MHz, the frequency resolution 0.05 Hz–0.1 Hz, the output amplitude 1.0–4.5 V, the frequency accuracyKfmin=94.12% andKfmax=99.99%, and the signal distortionRTHDmin=0.638% andRTHDmax=11.67%.
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Li, Xiao Wen, Mao Yue Wang, and Dan Wang. "The Research on PRACH Receiver and the DSP Implementation." Applied Mechanics and Materials 543-547 (March 2014): 2518–21. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.2518.
Повний текст джерелаАнотація:
In LTE system, random access plays an important role in both uplink time adjustment and initial access of UE. This paper analyzes the theory of the related signal detection and the correlation calculation, and proposes a method to detect the received sequence in the receiver. And at last, it presents the implementation on DSP including the baseband signal processing module, Local frequency domain ZC sequence generation module and Correlation calculation module. In a word, it provides a solution for implement the PRACH receiver on hardware.
13
Wang, Jun, Moudao Li, Weibin Jiang, Yanwei Huang, and Ruiquan Lin. "A Design of FPGA-Based Neural Network PID Controller for Motion Control System." Sensors 22, no. 3 (January 24, 2022): 889. http://dx.doi.org/10.3390/s22030889.
Повний текст джерелаАнотація:
In the actual industrial production process, the method of adaptively tuning proportional–integral–derivative (PID) parameters online by neural network can adapt to different characteristics of different controlled objects better than the controller with PID. However, the commonly used microcontroller unit (MCU) cannot meet the application scenarios of real time and high reliability. Therefore, in this paper, a closed-loop motion control system based on BP neural network (BPNN) PID controller by using a Xilinx field programmable gate array (FPGA) solution is proposed. In the design of the controller, it is divided into several sub-modules according to the modular design idea. The forward propagation module is used to complete the forward propagation operation from the input layer to the output layer. The PID module implements the mapping of PID arithmetic to register transfer level (RTL) and is responsible for completing the output of control amount. The main state machine module generates enable signals that control the sequential execution of each sub-module. The error backpropagation and weight update module completes the update of the weights of each layer of the network. The peripheral modules of the control system are divided into two main parts. The speed measurement module completes the acquisition of the output pulse signal of the encoder and the measurement of the motor speed. The pulse width modulation (PWM) signal generation module generates PWM waves with different duty cycles to control the rotation speed of the motor. A co-simulation of Modelsim and Simulink is used to simulate and verify the system, and a test analysis is also performed on the development platform. The results show that the proposed system can realize the self-tuning of PID control parameters, and also has the characteristics of reliable performance, high real-time performance, and strong anti-interference. Compared with MCU, the convergence speed is far more than three orders of magnitude, which proves its superiority.
14
Chung, Chin Ming, and Chun Chin Lin. "A Study of Solar Energy Produce Hydrogen Combine Fuel Cell Generator System." Applied Mechanics and Materials 284-287 (January 2013): 1173–76. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.1173.
Повний текст джерелаАнотація:
This paper aims to study the solar energy produce hydrogen combine fuel cell generation system. Utilization digital signal processor of power conversion for solar charging system for the overall system control center to achieve all stability of power system The system consists of a solar module to DC 14V 37W, PEMFC power generation 30W, digital signal processor( TMS320LF2407), assembly of bipolar electrolyzer and power converter The self –made hydroxide ion film of this experiment is excellent performance in separating hydrogen from Oxygen, so the hydrogen purity can be as high as 99.2%,and the generating efficiency of the fuel cell can be maintained at 29%.
15
Zhang, Deng Pan, and Zhi Qiang Gao. "Design and Implementation of Controllable Noise Source." Applied Mechanics and Materials 329 (June 2013): 283–87. http://dx.doi.org/10.4028/www.scientific.net/amm.329.283.
Повний текст джерелаАнотація:
To meet the characteristic diversity need of noise source in the product sound quality research, a parameter-controlled noise generation method is presented. The developed method is based on speech signal processing and programming. The system architecture of the controllable noise source is studied, and the implementation method of each module of the system is detailed. Modular design achieves data transfer and parameter control flexibly and conveniently between modules such as system calibration, basic acoustic signal production and conditioning, audio output control. Programming implement a controllable noise source platform based on the Visual C + + with friendly interface and reliable output.
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Taguchi, Takeyoshi, Christian Brönnimann, and Eric F. Eikenberry. "Next generation X-ray detectors for in-house XRD." Powder Diffraction 23, no. 2 (June 2008): 101–5. http://dx.doi.org/10.1154/1.2912455.
Повний текст джерелаАнотація:
A novel type X-ray detector, called PILATUS, has been developed at the Paul Scherrer Institut in Switzerland during the last decade. PILATUS detectors are two-dimensional hybrid pixel array detectors, which operate in single-photon counting mode. PILATUS detectors feature a very wide dynamic range (1:1 000 000), very short readout time (<3.0 ms), no readout noise, and very high counting rate (>2×106counts/s/pixel). In addition, a lower energy threshold can be set in order to suppress fluorescence background from the sample, thus a very good signal-to-noise ratio is achieved. The combination of these features for area detectors is unique and thus the PILATUS detectors are considered to be the next generation X-ray detectors. The basic building block of all the detectors is the PILATUS module having an active area of 83.8×33.5 mm2. The PILATUS 100K is a complete detector system with one module. PILATUS detector systems can have other configurations, including large area systems consisting of 20 to 60 modules that can cover up to an area of 431×448 mm2. Such large systems are mainly used for macromolecular structure determination, such as protein crystallography and small angle X-ray scattering. The PILATUS 100K detector can be easily adapted to many systems; the single-module detector is integrated to an in-house X-ray diffraction (XRD) system. Examples of XRD measurements with the PILATUS 100K detector are given.
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Liu, Bo, Lijia Zhang, Xiangjun Xin, and Lei Liu. "Flexible generation of optical nonuniform bit-mapping signal based on InP transmitter module." Optics Letters 39, no. 2 (January 6, 2014): 220. http://dx.doi.org/10.1364/ol.39.000220.
Повний текст джерела
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Georgopoulou, Antonia, Anton W. Bosman, Joost Brancart, Bram Vanderborght, and Frank Clemens. "Supramolecular Self-Healing Sensor Fiber Composites for Damage Detection in Piezoresistive Electronic Skin for Soft Robots." Polymers 13, no. 17 (September 2, 2021): 2983. http://dx.doi.org/10.3390/polym13172983.
Повний текст джерелаАнотація:
Self-healing materials can prolong the lifetime of structures and products by enabling the repairing of damage. However, detecting the damage and the progress of the healing process remains an important issue. In this study, self-healing, piezoresistive strain sensor fibers (ShSFs) are used for detecting strain deformation and damage in a self-healing elastomeric matrix. The ShSFs were embedded in the self-healing matrix for the development of self-healing sensor fiber composites (ShSFC) with elongation at break values of up to 100%. A quadruple hydrogen-bonded supramolecular elastomer was used as a matrix material. The ShSFCs exhibited a reproducible and monotonic response. The ShSFCs were investigated for use as sensorized electronic skin on 3D-printed soft robotic modules, such as bending actuators. Depending on the bending actuator module, the electronic skin was loaded under either compression (pneumatic-based module) or tension (tendon-based module). In both configurations, the ShSFs could be successfully used as deformation sensors, and in addition, detect the presence of damage based on the sensor signal drift. The sensor under tension showed better recovery of the signal after healing, and smaller signal relaxation. Even with the complete severing of the fiber, the piezoresistive properties returned after the healing, but in that case, thermal heat treatment was required. With their resilient response and self-healing properties, the supramolecular fiber composites can be used for the next generation of soft robotic modules.
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Toledo, Sergio, Edgar Maqueda, Marco Rivera, Raúl Gregor, Pat Wheeler, and Carlos Romero. "Improved Predictive Control in Multi-Modular Matrix Converter for Six-Phase Generation Systems." Energies 13, no. 10 (May 25, 2020): 2660. http://dx.doi.org/10.3390/en13102660.
Повний текст джерелаАнотація:
Distributed generation systems are emerging as a good solution as part of the response to the world’s growing energy demand. In this context multi-phase wind generation systems are a feasible option. These systems consist of renewable AC sources which requires efficient and controlled power conversion stages. This work proposes a novel predictive current control strategy that takes advantage of a multi-modular matrix converter topology in the power stage of a six-phase generation system. The proposed method uses a coupling signal between the modules to decrease the error and the total harmonic distortion compared to independent control of each module. Experimental results validate the new control strategy showing the improvement regarding the target parameters.
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Han, Bang Cheng, Dan He, Fang Zheng Guo, Yu Wang, and Bing Nan Huang. "The FPGA-Based Phase-Locked Loop Speed Control System of BLDCM for Magnetically Suspended Control Moment Gyroscope." Applied Mechanics and Materials 80-81 (July 2011): 1249–57. http://dx.doi.org/10.4028/www.scientific.net/amm.80-81.1249.
Повний текст джерелаАнотація:
A phase-locked loop (PLL) control system based on field programmable gates array (FPGA) is proposed through analyzing the model of three-phase unipolar-driven BLDCM (brushless direct current motor) to enhance the reliability and accurate steady-state speed for magnetically suspended control moment gyroscope (MSCMG). The numerical operation module, PLL module and current-loop control module are designed based on FPGA using very-high-speed integrated circuit hardware description language (VHDL) to realize the control law of the digital system. The pulse width modulation (PWM) generating module for Buck converter, the commutation signal generating module for the inverter and ADC module are designed for driving the motor and sampling the current signal. The PLL is analyzed and optimized in the paper and all the modules are verified using the software of ModelSim and the experiments. The simulation and experiment results on BLDCM of MSCMG show that the stability of the motor velocity can reach 0.01% and 0.02% respectively by the PLL technology based on FPGA, which is difficult to be obtained by conventional proportion integral different (PID) speed control.
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Xia, Zhijie, Yusong Wang, Ke Gong, and Wei Chen. "An in situ stretching instrument combined with low field nuclear magnetic resonance (NMR): Rheo-Spin NMR." Review of Scientific Instruments 93, no. 3 (March 1, 2022): 033905. http://dx.doi.org/10.1063/5.0080767.
Повний текст джерелаАнотація:
An in situ stretching instrument combined with low field nuclear magnetic resonance (LF-NMR) was designed and developed, namely, Rheo-Spin NMR. The time resolved stress–strain curve together with the corresponding NMR signal can be simultaneously obtained. The Rheo-Spin NMR contains the functional modules, including (1) the in situ stretching module, (2) the NMR signal acquisition module, and (3) the cavity of the NMR positioning module. The unique ring-like shape of the sample is used to replace the traditional dumbbell sample due to limited space in the NMR probe, and the whole ring-like sample will be deformed during the uniaxial stretching process, which avoids the generation of interference signals from the undeformed sample. The designed stretching assembly made by zirconia ceramics is manufactured to match and stretch the ring-like samples. The strain rate can be tuned within the range of 10−5–10−2 s−1 with the maximum stretching ratio λmax of ∼3.8. The in situ stretching experiments combined with LF-NMR were carried out successfully with natural rubber of different fractions of carbon black. The time-resolved T2 relaxometry was adopted to evaluate segmental relaxation during uniaxial deformation which, for the first time, provides the direct and in situ molecular dynamics information. The Rheo-Spin NMR is promising to provide more in-depth insights into the structure and dynamics evolution of polymer products under real service conditions.
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Kremenetskaya, Y. A., S. E. Markov, and Yu V. Melnyk. "Structural optimization of optoelectronic components in millimeter-wave radio-transmitting modules." Semiconductor Physics, Quantum Electronics and Optoelectronics 23, no. 04 (November 19, 2020): 424–30. http://dx.doi.org/10.15407/spqeo23.04.424.
Повний текст джерелаАнотація:
The paper analyzes the effect of structure inherent to optoelectronic radio-transmitting modules of a phased array antenna (PAA) on the noise characteristics in the millimeter range (MMR) of waves. Considered are promising structures of MMR modules for generating radiation with a phased array for communication systems based on optoelectronic technologies. The promising types of photodiodes that are used to form MMR radio signals as well as the distance and physical limitations for photodetectors associated with a limited bandwidth and nonlinear response characteristics have been analyzed. Mathematical modeling of the oscillation of the output current after the optoelectronic conversion of the signal and noise characteristics of the radio-transmitting modules capable to form MMR radiation in PAA has been carried out. The analysis of the nonlinearity of the sensitivity of photodiodes in the high-frequency regions of formation of radio signals has been carried out. The necessity to structurally optimize optoelectronic components in the MMR transmission module has been shown depending on the noise characteristics of the output signal. It has been shown that fundamental studies of nonlinear characteristics and factors limiting the band of photodetectors are important tasks for further developing MMR telecommunications of the next generations.
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Zhao, Qingchun, Maohai Zhai, Wenbo Shi, and Bin Wu. "Generation of Tunable Microwave Frequency Comb Utilizing a Semiconductor Laser Subject to Optical Injection from an SFP Module Modulated by an Arbitrary Periodic Signal." Complexity 2020 (June 8, 2020): 1–7. http://dx.doi.org/10.1155/2020/9504152.
Повний текст джерелаАнотація:
In this paper, a microwave frequency comb (MFC) is generated from a semiconductor laser subject to optical injection from a commercial small form-factor pluggable (SFP) optical module which is modulated by an arbitrary periodic signal. A sinusoidal signal or square wave signal is employed as the arbitrary periodic signal instead of the electric pulse signal adopted in the former references. When the frequency of the modulated signal is 1 GHz, the MFC with a maximal bandwidth of 15 GHz can be obtained. In addition, taking a sinusoidal signal as an example, the influence of the injection optical power to the slave laser and the modulation frequency of the optical module on the generation of the MFC is analyzed in detail. Finally, the results of MFC generated with a square wave signal injection are presented. The experimental results of this paper provide an important reference for the practical applications of MFC.
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Ksenofontov, D. G., and V. N. Kostin. "Implementation of digital methods to analyze eddy-current signals based on the E14-440 module." Diagnostics, Resource and Mechanics of materials and structures, no. 6 (December 2021): 32–36. http://dx.doi.org/10.17804/2410-9908.2021.6.032-036.
Повний текст джерелаАнотація:
Nondestructive testing methods utilize various sensors, and different signal types require different processing methods. Digital implementation of signal processing methods can expand the variety of methods implemented by one system. An eddy-current test system based on the E14-440 module has been developed. Quadrature amplitude demodulation and fast Fourier transformation are implemented to analyze the signal. The amplitude, phase, and complex parts of the signal are calculated. It is shown that both methods are applicable and allow elimination of some analog circuits. However, digital signal processing significantly depends on conversion rates and synchronization between generation and pickup of the signal.
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Pragathi, B., and M. Suman. "Controlling of PV-STATCOM for Increasing Power Transmission based on VHDL Signal Generation." International Journal of Engineering & Technology 7, no. 3.12 (July 20, 2018): 84. http://dx.doi.org/10.14419/ijet.v7i3.12.15868.
Повний текст джерелаАнотація:
Along with Generation of power, distribution of power is equally important.The power produced by the solar farm are utilized only during daytime, the solar farm remain idle during night and operate below capacity in initial morning and late afternoon. A grid connected solar farm uses photovoltaic (PV) arrays for generation of DC power which is transformed to AC using inverter modeling. A FACTS family device STATCOM is centered on a voltage source converter which operates as a rectifier and an inverter is used to enhance steady power transmission limits with reactive power, voltage and damping control. A majorsection of the STATCOM is a voltage source converter which is also anessential element of PV solar module. A novel concept was proposed by which PV solar module can be operated as a STATCOM, known as PV-STATCOM in the night-time and day time. VLSI technology is used to generate the trigger pulses for three phase inverter using the VHDL programming language to generate the signal for the control of inverter section in STATCOM. The HDL compiling and FPGA implementation is done using MATLAB/SIMULINK.
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Lee, Seongjun, Namgyu Lim, Wonseon Choi, Yongtak Lee, Jongbok Baek, and Jungsoo Park. "Study on Battery Charging Converter for MPPT Control of Laser Wireless Power Transmission System." Electronics 9, no. 10 (October 21, 2020): 1745. http://dx.doi.org/10.3390/electronics9101745.
Повний текст джерелаАнотація:
Herein, the voltage and current output characteristics of a laser photovoltaic (PV) module applied to a wireless power transmission system using a laser beam are analyzed. First, an experiment is conducted to obtain the characteristic data of the voltage and current based on the laser output power of the laser PV module, which generates the maximum power from the laser beam at a wavelength of 1080 nm; subsequently, the small-signal voltage and current characteristics of the laser PV module are analyzed. From the analysis results, it is confirmed that the laser PV module has a characteristic in which the maximum power generation point varies according to the power level of the laser beam. In addition, similar to the solar cell module, it is confirmed that the laser PV module has a current source and a voltage source region, and it shows a small signal resistance characteristic having a negative value as the operating point goes to the current source region. In addition, in this paper, by reflecting these electrical characteristics, a method for designing the controller of a power converter capable of charging a battery while generating maximum power from a PV module is proposed. Since the laser PV module corresponds to the input source of the boost converter used as the power conversion unit, the small-signal transfer function of the boost converter, including the PV module, is derived for the controller design. Therefore, by designing a controller that can stably control the voltage of the PV module in the current source, the maximum power point, and voltage source regions defined according to the output characteristics of the laser PV module, the maximum power is generated from the PV module. Herein, a systematic controller design method for a boost converter for laser wireless power transmission is presented, and the proposed method is validated based on the simulation and experimental results of a 25-W-class boost converter based on a microcontroller unit control.
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Ma, Chao-Tsung, Zhen-Yu Tsai, Hung-Hsien Ku, and Chin-Lung Hsieh. "Design and Implementation of a Flexible Photovoltaic Emulator Using a GaN-Based Synchronous Buck Converter." Micromachines 12, no. 12 (December 20, 2021): 1587. http://dx.doi.org/10.3390/mi12121587.
Повний текст джерелаАнотація:
In order to efficiently facilitate various research works related to power converter design and testing for solar photovoltaic (PV) generation systems, it is a great merit to use advanced power-converter-based and digitally controlled PV emulators in place of actual PV modules to reduce the space, cost, and time to obtain the required scenarios of solar irradiances for various functional tests. This paper presents a flexible PV emulator based on gallium nitride (GaN), a wide-bandgap (WBG) semiconductor, and a based synchronous buck converter and controlled with a digital signal processor (DSP). With the help of GaN-based switching devices, the proposed emulator can accurately mimic the dynamic voltage-current characteristics of any PV module under normal irradiance and partial shading conditions. With the proposed PV emulator, it is possible to closely emulate any PV module characteristic both theoretically, based on manufacturer’s datasheets, and experimentally, based on measured data from practical PV modules. A curve fitting algorithm is used to handle the real-time generation of control signals for the digital controller. Both simulation with computer software and implementation on 1 kW GaN-based experimental hardware using Texas Instruments DSP as the controller have been carried out. Results show that the proposed emulator achieves efficiency as high as 99.05% and exhibits multifaceted application features in tracking various PV voltage and current parameters, demonstrating the feasibility and excellent performance of the proposed PV emulator.
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Flores, David, Salvador Hidalgo, and Jesús Urresti. "New generation of 3.3kV IGBTs with monolitically integrated voltage and current sensors." Facta universitatis - series: Electronics and Energetics 28, no. 2 (2015): 213–21. http://dx.doi.org/10.2298/fuee1502213f.
Повний текст джерелаАнотація:
Although IGBT modules are widely used as power semiconductor switch in many high power applications, there are still reliability problems related to the current unbalance between paralleled IGBTs that may destroy the whole module and, eventually, the power system. Indeed, short-circuit and overvoltage events can also destroy some of the IGBTs of the power module. In this sense, the instantaneous monitoring of the anode current and voltage values and the use of a more intelligent gate driver able to work with the signals of each particular IGBT of the module would enhance its operating lifetime. In this sense, the paper describes the design, optimization, fabrication and basic performances of 3.3kV-50A punch-through IGBTs for traction and tap changer applications where anode current and voltage sensors are monolithically integrated within the IGBT core.
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Geng, Wei Dong, Hao Yang Fan, Zu Jun Sun, Yan Yan Liu, Kai Zhou, Hao Ran Yang, and Xiao Peng Li. "Modular Design of Control System for Photovoltaic Inverter." Advanced Materials Research 860-863 (December 2013): 156–62. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.156.
Повний текст джерелаАнотація:
This paper analyzes the modular design method of the photovoltaic power generation system and presents a 5KW solar power inverter with variety of operating modes. Depending on the signal interface model, the hardware circuit is divided into several modules, including DC-DC main power circuit, DC-DC control circuit, DC-AC main power circuit, DC-AC control circuit and auxiliary power supply module. The circuit detail design is given and this system has been already used in the solar power stations. The circuit has a reusable and beneficial photovoltaic inverter standardized design. The experiment results prove that this system has features of reliability, easy maintenance, strong scalability and meets the requirements of the solar-energy generation system.
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Kalla, Hamoudi, David Berner, and Jean-Pierre Talpin. "Automated Generation of Synchronous Formal Models from SystemC Descriptions." Journal of Circuits, Systems and Computers 28, no. 04 (March 31, 2019): 1950061. http://dx.doi.org/10.1142/s0218126619500610.
Повний текст джерелаАнотація:
SystemC is one of the most popular electronic system-level design language and it is embraced by a growing community that seeks to move to a higher level of abstraction. It lacks however a standard way of integrating formal methods and formal verification techniques into a SystemC design flow. In this paper, we show how SystemC descriptions are automatically transformed into the formal synchronous language Signal, while conserving the original structure and enabling the application of formal verification techniques. Signal provides a simple semantics of concurrency and time, and allows verification with an existing theorem prover and model checker. The approach that we propose consists of two steps: the extraction of the structure and the transformation of the behavior. In the first step, SystemC model is analyzed and the structural information is extracted. In the second step, for each SystemC module, the corresponding Signal behavior is generated and filled into the already prepared Signal structure.
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Gao, Juanjuan, Fei Tian, Chong Lyu, and Xianhua Qiao. "Design and Implementation of a Heating Treatment System for Vitiligo Skin Disease Based on Medical Ultrasound." Journal of Healthcare Engineering 2021 (March 9, 2021): 1–11. http://dx.doi.org/10.1155/2021/6634846.
Повний текст джерелаАнотація:
Vitiligo is relatively common clinically. It is an acquired and persistent skin and mucosal pigment depigmentation disease. As a noninvasive and nonradioactive treatment, high-energy ultrasound has been applied to skin diseases of vitiligo. Treatment achieved good clinical results. This article analyzes the structure of the original medical ultrasound system for vitiligo and finds the deficiencies and missing components of the system. On the basis of the original design scheme, a new structural scheme was designed, which solved the shortcomings of the original system and added missing parts. Subsequently, according to actual application requirements and specific component performance, the schematic design, including audio and video input, output and storage, DDR3, Ethernet, and the design of key circuits, such as power supply modules, are specifically introduced. Later, in the PCB design, the contents including stacking, layout, routing, and simulation of key signals were introduced in detail. The design includes a probe excitation signal generation module, excitation signal parameter control module, high voltage and temperature monitoring module, and corresponding power conversion module. This paper is mainly to develop a vitiligo skin disease heating treatment array system based on the principle of both cost and performance. This paper is based on the nonrigid registration algorithm of the FFD model and HPV interpolation and the nonrigid registration algorithm combining shape information and SIFT method. In the focused ultrasound treatment system, the image-guided positioning and monitoring functions are realized. Studies have shown that when the peak voltage of the transmitter circuit is 55 V, the sound power is 0.28 W. It can be seen that the transmitting circuit system designed in this article is a relatively stable and reliable system, which is suitable for the ultrasound treatment of vitiligo skin diseases.
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Wei, Wei, Tao Peng, and Li Ye. "Pulse interference identification and suppression for OFDM signal." Journal of Physics: Conference Series 2108, no. 1 (November 1, 2021): 012028. http://dx.doi.org/10.1088/1742-6596/2108/1/012028.
Повний текст джерелаАнотація:
Abstract The new generation smart meter is the core node of information acquisition and flows in the power Internet of Things (IoT). Because it is powered by the low-voltage power line, various short-time pulse interference signals in the line can be easily coupled to the received signal of the communication module embedded in the meter, resulting in the degradation of communication performance. In view of this situation, an identification-suppression algorithm of the short-time pulse-interference signal is proposed. The core idea is to comprehensively judge the existence of the interference signal and its specific position in the time domain based on the energy ratio of adjacent OFDM symbols and the change of mean square error value between frequency domain amplitude signals. Based on this, an interference energy elimination scheme with an adaptive threshold is realized. Theoretical analysis and simulation results show that the scheme has low computational complexity, high accuracy of pulse interference identification and position judgment, and can effectively reduce the energy of pulse interference signal, and thus improving the decoding performance of OFDM while it receives signals.
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Aksshaya, B., G. Madhura L. V., Nivethashri S, Vishnuvarthini T, and Mohankumar N. "Design And Analysis of Analog TRNG Using Sample and Hold Circuit." International Journal of Engineering & Technology 7, no. 3.8 (July 7, 2018): 69. http://dx.doi.org/10.14419/ijet.v7i3.8.15222.
Повний текст джерелаАнотація:
Implementation of analog True random number generators is inevitable in almost all the security applications and encryption protocols nowadays. Although many digital True Random Number Generators are available, we proposed a method of random number generation using analog module of mixed signals. In actual fact generation of True Random Numbers is by utilizing the sample and hold circuit which is controlled by another random clock source, and a post processing circuit for generation of unpredictable binary sequence of numbers. The primary input source is an analog signal, essentially highly random noise from the external environment. The high unpredictability, less resource and simple circuit design are some highlights of the proposed work. Finally, the randomness is evaluated using NIST test suites and results are plotted and analyzed.
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Tan, Xiao Long, Jia Zhou, and Wen Bin Wang. "Simulation of Function Generator." Advanced Materials Research 986-987 (July 2014): 1854–57. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1854.
Повний текст джерелаАнотація:
The function generator is the classic analog adder circuit, either independently or as an intermediate for its links embedded in complex circuits, have a very wide range of applications. Function generator can be used as the signal source to produce for research, teaching, experimental signals for different purposes such as how to make it more accurate and stable signal generation, has been widespread concern and research; Similarly, construction work adder circuit commonly used as a module, accurate input-output relationship is also very worth exploring. Therefore, this paper, on both a profound theoretical analysis, based on the modeling and simulation through the more figurative exposition of both operating characteristics, application to increase its theoretical basis.
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Chueprasert, Warunchit, and Danai Phaoharuhansa. "Study of Regenerative Braking System and Brake Force using Pulse Width Module." MATEC Web of Conferences 306 (2020): 01004. http://dx.doi.org/10.1051/matecconf/202030601004.
Повний текст джерелаАнотація:
This paper aims to develop regenerative braking using pulse width module (PWM) control. It concerns frequency of regenerative braking period which is used to control regenerative braking. It is usually restricted by the electric power generation of AC synchronous axial motor. It is measured by motor bench tester. It indicates electronic brake torque and regenerative current. The resistance torque and regenerative current characteristics are expressed as second order polynomial equation. The results present the comparison between pulse signal and full period signal. The maximum deceleration is 10 Hz signal at 2.14 m/s2, which is not exceed deceleration of brake comfort. The harvest energy at 10 Hz PWM control is 1.40 Wh. It is closely to use full period regenerative brake, but 10 Hz PWM control has comfortable than other frequencies and efficiency is 54.3 percent.
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Schless, Ton. "The Relevance of Low Temperature Co-fired Ceramic Module Packaging in the 5G Market." International Symposium on Microelectronics 2017, no. 1 (October 1, 2017): 000773–78. http://dx.doi.org/10.4071/isom-2017-wp31_147.
Повний текст джерелаАнотація:
Abstract 5th Generation Telecommunications Technology, 5G, is emerging to provide the market with even higher data rates and bandwidth and lower response times than the 4th generation telecommunications technology, 4G/LTE, that is currently deployed. With commercial 5G networks coming on-line in 2020 the network providers and infrastructure companies are quickly developing devices and systems to meet the demand of the 5G market. Since high data rates and high bandwidths demand high frequency microwave, MW, devices, Low-Temperature Co-fired Ceramic, LTCC, is one of the materials of choice for those modules in a 5G system that require the high 3D integration, high signal integrity, high reliability and high power performance of LTCC. LTCC has proven for more than two decades now to exhibit these qualities in high-frequency telecommunication applications. This paper explores the relevance of LTCC technology in the module packaging market in the 5G market.
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Cohen, Kenneth D., Bradley R. Berg, and Ingrid H. Sarelius. "Remote arteriolar dilations in response to muscle contraction under capillaries." American Journal of Physiology-Heart and Circulatory Physiology 278, no. 6 (June 1, 2000): H1916—H1923. http://dx.doi.org/10.1152/ajpheart.2000.278.6.h1916.
Повний текст джерелаАнотація:
In hamster cremaster muscle, it has been shown previously that contraction of skeletal muscle fibers underlying small groups of capillaries (modules) induces dilations that are proportional to metabolic rate in the two arteriolar generations upstream of the stimulated capillaries (Berg BR, Cohen KD, and Sarelius IH. Am J Physiol Heart Circ Physiol 272: H2693–H2700, 1997). These remote dilations were hypothesized to be transmitted via gap junctions and not perivascular nerves. In the present study, halothane (0.07%) blocked dilation in the module inflow arteriole, and dilation in the second arteriolar generation upstream, the branch arteriole, was blocked by both 600 mosM sucrose and halothane but not tetrodotoxin (2 μM). Dilations in both arterioles were not blocked by the gap junction uncoupler 18-β-glycyrrhetinic acid (40 μM), and 80 mM KCl did not block dilation of the module inflow arteriole. These data implicate a gap junctional-mediated pathway insensitive to 18-β-glycyrrhetinic acid in dilating the two arterioles upstream of the capillary module during “remote” muscle contraction. Dilation in the branch arteriole, but not the module inflow arteriole, was attenuated by 100 μM N ω-nitro-l-arginine. Thus selective contraction of muscle fibers underneath capillaries results in dilations in the upstream arterioles that have characteristics consistent with a signal that is transmitted along the vessel wall through gap junctions, i.e., a conducted vasodilation. The observed insensitivities to 18-β-glycyrrhetinic acid, to KCl, and to N ω-nitro-l-arginine suggest, however, that there are multiple signaling pathways by which remote dilations can be initiated in these microvessels.
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Clayton, James E. "Flex-DIMM – A New High Density Module Form Factor." International Symposium on Microelectronics 2015, no. 1 (October 1, 2015): 000806–9. http://dx.doi.org/10.4071/isom-2015-thp31.
Повний текст джерелаАнотація:
The Dual In-Line Memory Module (DIMM) has remained relatively unchanged for the past two decades, with exception of an increase in PCB size, I/O pads and layer count. A new generation called Flex-DIMM is introduced by replacing the rigid-PCB substrate with a thin, bifurcated, flexible circuit that enables several improvements; including a thinner cross-section, better signal integrity with lower layer count, better thermal dissipation and ability to be directly mated to the surface of a motherboard. Originally intended for RDIMM applications, the new module may be an ideal solution for clustered microservers.
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Palombini, Diego, Maciej Jankowski, and Ernesto Limiti. "Downconverting Module Architectures for High Performance Multipixel Cameras." International Journal of Microwave Science and Technology 2013 (April 15, 2013): 1–8. http://dx.doi.org/10.1155/2013/586158.
Повний текст джерелаАнотація:
Multipixel cameras represent an emerging topology for arrays receivers, improving speed and accuracy of both security scanning systems and radioastronomical sky surveys by means of a matrix of phased elements. Difficulties in the generation and proper distribution to each pixel of the local oscillator signal still limit their use to frequency ranges below a few GHz or at least seriously affect the complexity of the implementable cameras. This work presents a full comparison between two possible system architectures, alternatively based on LO frequency multiplication or subharmonic mixing strategies, aiming to overcome the aforesaid limitations: design and performance of two compact test vehicles in MMIC technology, both operating in the Q-band frequency range with ultrabroadband IF section, are reported.
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Analia, Riska, Jan Hong, Joshua Mangkey, Susanto, Daniel Pamungkas, Hendawan Soebhakti, and Abdullah Sani. "Use of the Human Walking Gait Cycle for Assistive Torque Generation for the Hip Joint Exoskeleton." Journal of Robotics 2021 (December 7, 2021): 1–12. http://dx.doi.org/10.1155/2021/5561600.
Повний текст джерелаАнотація:
The development of an assistive robot to assist human beings in walking normally is a difficult task. One of the main challenges lies in understanding the intention to walk, as an initial phase before walking commences. In this work, we classify the human gait cycle based on data from an inertial moment unit sensor and information on the angle of the hip joint and use the results as initial signals to produce a suitable assistive torque for a lower limb exoskeleton. A neural network module is used as a prediction module to identify the intention to walk based on the gait cycle. A decision tree method is implemented in our system to generate the assistive torque, and a prediction of the human gait cycle is used as a reference signal. Real-time experiments are carried out to verify the performance of the proposed method, which can differentiate between various types of walking. The results show that the proposed method is able to predict the intention to walk as an initial phase and is also able to provide an assistive torque based on the information predicted for this phase.
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Groß, Felix, Nick Träger, Frank Schulz, Markus Weigand, Thomas Dippon, and Joachim Gräfe. "A high frequency builder software for arbitrary radio frequency signals." Review of Scientific Instruments 93, no. 3 (March 1, 2022): 034704. http://dx.doi.org/10.1063/5.0082934.
Повний текст джерелаАнотація:
While the frequencies accessible by signal generators steadily rise, the synthesization of complex and arbitrary waveforms with high frequency components remains challenging, especially when restricted by an external reference clock. In this article, we present a comprehensive software package combined with state-of-the-art hardware as a solution for the generation of highly sampled, arbitrary radio frequency waveforms. The software can be used to conduct both synchronous and heterodyne pump–probe experiments due to a variety of different synchronization modules. While both kinds of modules allow for standard waveforms, such as sines, pulses, and bursts, as well as any arbitrary signal, the heterodyne modules additionally are not restricted by the reference clock frequency. Both the output and the synchronization module can be adapted to support additional measurement devices. Due to the modular software structure, individual classes can be exchanged while maintaining all functionalities. The software provides a user friendly graphical interface that allows us to compose, save, and load complex arbitrary waveforms within only a few steps. The frequency selectivity provided by the software-hardware combination allows us to directly target specific excitation states of physical systems. Conducting a heterodyne scanning transmission x-ray microscopy experiment, we are able to demonstrate the capabilities of the software when paired with a high sample rate arbitrary waveform generator. The heterodyne synchronization modules allow for unlimited flexibility leveraging arbitrary waveform generation to their full power. By solving the challenges of synthesizing highly complex electromagnetic waves, the software enables a large variety of experiments to be performed more conveniently.
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Pyatakovich, F. A., K. F. Makkonen, and T. I. Yakunchenko. "BIOTECHNICAL SYSTEM TO GENERATIONS EEG LIKE SIGNAL." Bulletin of Siberian Medicine 12, no. 2 (April 28, 2013): 104–12. http://dx.doi.org/10.20538/1682-0363-2013-2-104-112.
Повний текст джерелаАнотація:
The Purpose – realization of the structure specialized biooperated module to generations EEG-like signal directed on personalization and reinforcement to efficiency of the treatment. In work are used methods of modeling, system technical analysis and constructing.The conclusion: Its were designed models of the formulas of the action, which provide presenting on electrodes for stimulation modulated current by means of signal of the pulse and breathings within the range of changeable frequencies 7–13–7 Hz or 14–26–14 Hz.
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Asif, Rameez, Rabeea Basir, and Ramshah Ahmad. "Signal Processing Algorithms for Down-Stream Traffic in Next Generation 10 Gbit/s Fixed-Grid Passive Optical Networks." Advances in OptoElectronics 2014 (June 22, 2014): 1–4. http://dx.doi.org/10.1155/2014/296781.
Повний текст джерелаАнотація:
We have analyzed the impact of digital and optical signal processing algorithms, that is, Volterra equalization (VE), digital backpropagation (BP), and optical phase conjugation with nonlinearity module (OPC-NM), in next generation 10 Gbit/s (also referred to as XG) DP-QPSK long haul WDM (fixed-grid) passive optical network (PON) without midspan repeaters over 120 km standard single mode fiber (SMF) link for downstream signals. Due to the compensation of optical Kerr effects, the sensitivity penalty is improved by 2 dB by implementing BP algorithm, 1.5 dB by VE algorithm, and 2.69 dB by OPC-NM. Moreover, with the implementation of NL equalization technique, we are able to get the transmission distance of 126.6 km SMF for the 1 : 1024 split ratio at 5 GHz channel spacing in the nonlinear region.
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Han, Zhenyu, Hongyu Jin, Maoyue Li, and Hongya Fu. "An Open Modular Architecture Controller Based Online Chatter Suppression System for CNC Milling." Mathematical Problems in Engineering 2015 (2015): 1–13. http://dx.doi.org/10.1155/2015/985837.
Повний текст джерелаАнотація:
In milling processes, chatter is a kind of sudden relative vibration appearing between the cutter and the workpiece, which results in poor part quality, accelerated tool wear, and shortened spindle life. In this paper, an open modular architecture controller (OMAC) of machine tool which integrates the algorithms including chatter recognition, compensation command generation, and execution is proposed with the aim of providing an integrated solution for milling chatter suppression in CNC kernel. To effectively identify chatter, experiments are designed to determine the optimal installation place of accelerometer and then triaxial cutting forces and acceleration signals are compared to see which are more sensitive to chatter onset. In terms of data processing, 16 sampling points in time domain are chosen to perform online fast Fourier transform (FFT) in consideration of signal effectiveness and computational efficiency. To implement real-time chatter suppression in CNC kernel, a simplified dynamic model of milling system is used to obtain the relationship between chatter frequency and spindle speed. Finally, an adaptive control module which completes force signal extraction and processing by FFT and has the ability to modify related cutting parameters is designed to interact with other modules in OMAC where data acquisition thread and interpolation thread are synchronized. The proposed system is experimentally validated.
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Mohd Hussain, Mohd Najib, Ahmad Maliki Omar, and Intan Rahayu Ibrahim. "Harvesting Maximum Power from Mismatch Module of PV System Using PO Buck-Boost Converter." Advanced Materials Research 953-954 (June 2014): 95–98. http://dx.doi.org/10.4028/www.scientific.net/amr.953-954.95.
Повний текст джерелаАнотація:
This paper presents a simulation and laboratory test of Photovoltaic (PV) module incorporated with Positive Output (PO) Buck-Boost Converter for harnessing maximum energy from the solar PV module. The main intention is to invent a system which can harvest maximum power point (MPP) energy of the PV system in string-connection. The model-based design of the controller and maximum power point tracking (MPPT) algorithm for the system were implemented using MATLAB SIMULINK software. For laboratory execution, the digital microcontroller of dsPIC30F digital signal controller (DSC) was used to control the prototype of PO buck-boost converter. The code generation via MPLAB Integrated Development Environment (IDE) from model-based design was embedded into the dsPIC30F using the SKds40A target board and PICkit 3 circuit debugger. The system was successfully simulated and verified by simulation and laboratory evaluations. A physical two PV module of PV-MF120EC3 Mitsubishi Electric is modeled in string connection to represent a mismatch module. While in laboratory process, a string-connection of 10W and 5W PV module is implemented for the mismatch module condition.
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Ovcharenko, B. D., V. K. Bagdasarov, V. V. Bukin, T. V. Dolmatov, D. D. Chesalin, V. B. Tsvetkov, and S. V. Garnov. "Laser gain module small-signal gain increase due to suppression of parasitic generation with pump geometry optimization." Laser Physics 30, no. 9 (August 10, 2020): 095003. http://dx.doi.org/10.1088/1555-6611/aba59e.
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Zhao, Jing, Hao Nie, and Jing Yu. "A IF Signal Precessing System Design Based on Software Radio Platform." ITM Web of Conferences 17 (2018): 01014. http://dx.doi.org/10.1051/itmconf/20181701014.
Повний текст джерелаАнотація:
Software radio is a definition of a design thought about how to implement flexible functions by using fixed hardware platform. Any platform based on this is characterized to be universal, standardized, modular, open and highly flexible. Due to some realistic reasons, a software radio platform is hard to be realized. So, most signal processing is operated after mixing. According to software radio requirements, a “FPGA+ADC+DAC” structure is designed. Compared with former processors, this module has broad application prospects with the small size, low power, configurable and programmable feathers. It has multifunction, such as generating IF signals, performing digital down conversion and realizing the synchronous demodulation and the other functions. This module also provides the extended host interface to communicate with upper computers. According to the practical test, take MSK signal for example, if the bit rate is 1Mb/s, bit error rate is lower than 10-6.
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Janu, Premysl, and Sang Van Doan. "Multifunctional Signal Generator for Calibration System of Jet Engine Exhaust Gas Temperature Measurement." Periodica Polytechnica Transportation Engineering 47, no. 1 (August 9, 2017): 25–28. http://dx.doi.org/10.3311/pptr.9452.
Повний текст джерелаАнотація:
One of the most important systems of an aircraft jet engine is exhaust gas temperature measurement system that ensure right function of the engine. Temperature of the gas flowing from the engine turbine is quite high. There is one way, how to measure high temperature and it is by thermocouple. So the main aim of the paper is to describe creation and correct function analysis of a thermocouple simulator. Thermocouple generates very low voltage depending on a temperature that ranges from units micro-volts to several tens of millivolts. Generating of such low voltage using simulator is not easy, because this voltage may move at levels of noise. Voltage generation is performed by digital-analogue converter, which is controlled by a microcontroller via SPI bus. The generated voltage is further reduced to a level corresponding to the voltage output of the thermocouple. Several calibration waveforms are performed belonging to appropriate thermocouple type for multifunctional use. Only positive temperatures are generated, because exhaust gas temperature measurement system is aimed at high temperatures. The power supply circuit offers two options. It is supply from accumulator for its portability or from the laboratory power supply. Surface mounted devices are selected in terms of module miniaturization. The newest device base is chosen for modern design of the module. The temperature waveform is generated by the way of polynomial approximation with correction. Dependence of real generated voltage on the voltage, which is defined by appropriate thermocouple type standard and errors evaluation, is used as a proof of proper function.
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Shin, Jaehee, Sungho Ji, Jiyoung Yoon, and Jinhyoung Park. "Module-Type Triboelectric Nanogenerators Capable of Harvesting Power from a Variety of Mechanical Energy Sources." Micromachines 12, no. 9 (August 29, 2021): 1043. http://dx.doi.org/10.3390/mi12091043.
Повний текст джерелаАнотація:
In this study, we propose a module-type triboelectric nanogenerator (TENG) capable of harvesting electricity from a variety of mechanical energy sources and generating power from diverse forms that fit the modular structure of the generator. The potential energy and kinetic energy of water are used for the rotational motion of the generator module, and electricity is generated by the contact/separation generation mode between the two triboelectric surfaces inside the rotating TENG. Through the parametric design of the internal friction surface structure and mass ball, we optimized the output of the proposed structure. To magnify the power, experiments were conducted to optimize the electrical output of the series of the TENG units. Consequently, outputs of 250 V and 11 μA were obtained when the angle formed between the floor and the housing was set at 0° while nitrile was set as the positively charged material and the frequency was set at 7 Hz. The electrical signal generated by the module-type TENG can be used as a sensor to recognize the strength and direction of various physical quantities, such as wind and earthquake vibrations.
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Whitehurst, Angelique, Melanie H. Cobb, and Michael A. White. "Stimulus-Coupled Spatial Restriction of Extracellular Signal-Regulated Kinase 1/2 Activity Contributes to the Specificity of Signal-Response Pathways." Molecular and Cellular Biology 24, no. 23 (December 1, 2004): 10145–50. http://dx.doi.org/10.1128/mcb.24.23.10145-10150.2004.
Повний текст джерелаАнотація:
ABSTRACT Current understanding of cell regulatory systems suggests a diverse array of extracellular stimuli commonly recruit a limited cadre of core signal transduction modules to drive discrete stimulus-specific responses. One such module is the Raf-MEK-extracellular signal-regulated kinase (ERK) kinase cascade. Little information exists about how this pathway can be appropriately coupled to discrete cell biological processes. Contributing factors may include regulation of the duration, amplitude, and/or subcellular compartmentalization of active ERK1/2. To define properties of ERK1/2 that may help mediate stimulus-selective signal propagation, we have examined the dynamic behavior of native ERK1/2 activation at the single-cell level. In primary human cell cultures, ERK1/2 activation is not an all-or-none response. Instead, the amount of active ERK1/2 in individual cells accumulated in proportion to the concentration of external stimulus. The variable degree of ERK1/2 activation correlated well with the degree of ERK1/2 effector activation. Therefore, the relative amplitude of ERK1/2 activation within a cell can be modulated and may contribute to the generation of stimulus-specific biological responses. Importantly, we also found that the capacity of active ERK1/2 to accumulate in the nucleus and drive immediate-early gene expression is dependent upon the nature of the inductive signal, but independent of the amplitude of ERK1/2 activation. Therefore, nuclear accumulation of active ERK1/2 is a discrete regulated step that can direct the function of the kinase in response to specific stimuli.