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Articles de revues sur le sujet « AC analysis and Butterworth filter »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 1 février 2022

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1

Mishra, Akshansh. "Machine Learning Algorithm for Surface Quality Analysis of Friction Stir Welded Joint." Strojnícky časopis - Journal of Mechanical Engineering 70, no. 2 (2020): 11–20. http://dx.doi.org/10.2478/scjme-2020-0016.

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AbstractThe Friction Stir Welding process usually produces weld members of good quality compared to composite weld made with a standard welding process. However, there is a possibility of the formation of various defects if the input parameters are not properly selected. In the recent case study, an image-based feature recognition system using the Fourier conversion method which is a computer visual recognition tool is developed. Five types of filters like Ideal Filter, Butterworth Filter, Low Filter, Gaussian Filter, and High Pass Filter. The results showed that the high pass filter has more

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Ms. Mohini Dadhe, Ms. Sneha Miskin. "Optimized Wireless Stethoscope Using Butterworth Filter." International Journal of New Practices in Management and Engineering 4, no. 03 (2015): 01–05. http://dx.doi.org/10.17762/ijnpme.v4i03.37.

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Acoustic stethoscope is a primary diagnostic tool used by doctors for effective analysis of various diseases. But, it suffers defects such as low level heart sounds and presence of murmurs. This project aims at developing ‘Noise removal in stethoscope using Butterworth filter’. In this, the low level heart sounds were amplified with high gain pre-amplifier circuit. A review of basic filters like low pass RC filter, Butterworth filter, Chebyshev filter and Bessel filter are done for elimination of murmurs and best suited filter is suggested. Finally, amplified noise free heart sounds are simula

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Cui, Ding Yu, Ke Gui Xin, and Quan Quan Qi. "Structural Modal Analysis Based on HHT and Butterworth Filter." Advanced Materials Research 255-260 (May 2011): 1836–40. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.1836.

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Structural signal is taken self-adaptive decomposition by Hilbert-Huang Transform mainly composed of the EMD(empirical mode decomposition) and HT(Hilbert Transform), which is especially suitable for structural projects in the non-linear, non-stationary signal analysis through local characteristic. However, some weak signal may be ignored by EMD resulting in modal missing. Butterworth filter is an electronic filter designed to have flat frequency response. Considering the influence of noise , Hilbert-Huang Transform and Butterworth band pass filter are applied together to process the structural

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Stojanovic, Vidosav, Negovan Stamenkovic, and Nikola Stojanovic. "Active RC filter based implementation analysis part of two channel hybrid filter bank." Serbian Journal of Electrical Engineering 11, no. 4 (2014): 565–84. http://dx.doi.org/10.2298/sjee1404565s.

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In the present paper, a new design method for continuous-time powersymmetric active RC filters for Hybrid Filter Bank (HFB) is proposed. Some theoretical properties of continious-time power-symmetric filters bank in a more general perspective are studied. This includes the derivation of a new general analytical form, and a study of poles and zeros locations in s-plane. In the proposed design method the analytic solution of filter coefficients is solved in sdomain using only one nonlinear equation Finally, the proposed approximation is compared to standard approximations. It was shown that atte

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D.Yusuf, Samson, Francis C. Maduakolam, Ibrahim Umar, and Abdulmumini Z.Loko. "Analysis of Butterworth Filter For Electrocardiogram De-Noising Using Daubechies Wavelets." International Journal of Electronics and Communication Engineering 7, no. 4 (2020): 8–13. http://dx.doi.org/10.14445/23488549/ijece-v7i4p103.

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Chen, Dixiang, Wuqiang Yang, and Mengchun Pan. "The dynamic response of a Butterworth low-pass filter in an ac-based electrical capacitance tomography system." Measurement Science and Technology 21, no. 10 (2010): 105505. http://dx.doi.org/10.1088/0957-0233/21/10/105505.

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Wang, Yong Jing, Jin Ping Ge, Yin Wang, and Ling Zhang. "Stability Analysis of the AC Filter Capacitor Structure." Applied Mechanics and Materials 664 (October 2014): 326–30. http://dx.doi.org/10.4028/www.scientific.net/amm.664.326.

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In the UHV DC transmission engineering, mechanical strength and reliability of the capacitor structure is the premise to resist natural disasters such as earthquake or fierce wind. However, there are some unreasonable design problems or phenomena in which the structural strength and stiffness can not meet the structural stability requirements. In this paper, by using Solid Works software, the solid models of the capacitor structure with tilting layer and without tilting one are presented respectively at first. And then, the dynamic simulations of the structure are carried out by means of finit

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Sharma, Aditi, and Vijay Maheshwari. "Matlab Analysis of Image Smoothening By Butterworth and Gaussian Low Pass Filter." International Journal of Computer Applications 179, no. 50 (2018): 31–36. http://dx.doi.org/10.5120/ijca2018917347.

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Laghari, Wazir Muhammad, Mohammad Usman Baloch, Muhammad Abid Mengal, and Syed Jalal Shah. "Performance Analysis of Analog Butterworth Low Pass Filter as Compared to Chebyshev Type-I Filter, Chebyshev Type-II Filter and Elliptical Filter." Circuits and Systems 05, no. 09 (2014): 209–16. http://dx.doi.org/10.4236/cs.2014.59023.

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Gul, Tuba Nur, and Ali Kircay. "The Design of Fifth-Order Butterworth Lowpass Log-Domain Filter for Bluetooth/Wi-Fi Receiver Using Signal Flow Graph Method." Journal of Circuits, Systems and Computers 26, no. 01 (2016): 1750011. http://dx.doi.org/10.1142/s0218126617500116.

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In this study, a fifth-order lowpass log-domain Butterworth filter, which is appropriate for Bluetooth/Wi-Fi receiver, is designed with signal flow graph approach. The filter is realized by using a unique translinear integrator circuit. Bluetooth and Wi-Fi modes are obtained without changing the circuit configuration. To change the mode of the filter, it is needed to change the cutoff frequency of the filter that can be electronically tuned by adjusting the external currents. Wi-Fi and Bluetooth receivers have 6[Formula: see text]MHz and 600[Formula: see text]kHz cutoff frequencies, respective

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Billett, Henny Heisler, Noah Kornblum, Laurie Jacobs, and Nicholas Gargiulo. "A Preliminary Analysis of Inferior Vena Cava Filters with and without Anticoagulation vs Anticoagulation Only: Readmission and Mortality Rates." Blood 104, no. 11 (2004): 1776. http://dx.doi.org/10.1182/blood.v104.11.1776.1776.

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Abstract Inferior vena cava (IVC) filters are an increasingly popular option for patients with thrombosis and the advent of temporary filters may make this procedure an even more desirable alternative. We decided to evaluate how patients with inferior vena cava filters fared when compared to patients without such filters. A new software program, Clinical Looking Glass, replicates hospital records for statistical access with or without identifiers as defined by IRB-approved protocols. A cohort of patients who had a discharge diagnosis of deep venous thrombosis (DVT) and who had had an IVC filte

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Wang, De Qiang, Shi Liang Dong, and Yuan Jun Zhou. "Analysis of the 18-Pulse ATRU Filtering Characteristics Applied to the Pulse Load." Applied Mechanics and Materials 373-375 (August 2013): 1573–77. http://dx.doi.org/10.4028/www.scientific.net/amm.373-375.1573.

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A popular harmonic current reduction method specifically is to increase the number of rectification pulses such as 18-pulse ATRU. This paper presents a 2-order Butterworth LC filter designed to suppress the DC output voltage ripple of the ATRU. And an EMI filter is designed to overcome the electromagnetic interference caused by the high frequency pulse load. Because of the same position and configuration, the same filter is verified in theory to achieve both purposes. Finally, a simulation model of 18-pulse ATRU is built and the two filter's characteristics in the time domain are tested and an

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Oktivasari, Prihatin, Riandini Riandini, Rahmah A. Fitri, and Sungguh I. Malaon. "Active Filter Analysis on Designing Electronic Stethoscope." Jurnal Elektronika dan Telekomunikasi 19, no. 2 (2019): 51. http://dx.doi.org/10.14203/jet.v19.51-56.

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Early heart disease detection could be vital and some other diagnostic ways are being developed. In this paper, a lowcost tool for a diagnostic that analyzes the digitized heartbeat sound is given. This can be used to detect heart anomalies. The instrument shows the heart sound and also keeps a patient's long-term record for future use. The signal from the heart provides a lot of knowledge about the heart and offers an initial diagnosis recommendation. The electronic stethoscope uses the condenser microphone, preamplifier circuit, and filter circuit. The optimum filter is Butterworth with a fo

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Liao, Jianping, Hexiu Liu, Weibo Li, et al. "3-D Butterworth Filtering for 3-D High-density Onshore Seismic Field Data." Journal of Environmental and Engineering Geophysics 23, no. 2 (2018): 223–33. http://dx.doi.org/10.2113/jeeg23.2.223.

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Three-dimensional seismic survey is widely applied, but 3-D filtering technology has yet to be fully utilized for the analysis of seismic field data. The common approach is to first filter inline and then crossline. However, an effective 3-D filtering method is expected to eliminate coherent noise, such as the ground roll. We propose a 3-D Butterworth filtering method in the time-space domain. Firstly, a Butterworth-type filter in the frequency-wavenumber-domain is designed to suppress the linear noise with a specific apparent velocity. Secondly, transforming this filter to the time and space

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Issever Grochová, Ladislava, and Petr Rozmahel. "On the Ideality of Filtering Techniques in the Business Cycle Analysis Under Conditions of European Economy." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 63, no. 3 (2015): 915–26. http://dx.doi.org/10.11118/actaun201563030915.

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The paper deals with the applications and comparison of various filtering techniques, which is an integral part of the business cycles identification and their further analysis. In particular, the paper examines four high-pass and band-pass filters and compares them to an ideal filter. The gain function is estimated and shown by the periodogram to assess the filters’ efficiency in the extraction of undesired periods in the time series. The monthly data of industrial production indices of chosen EU countries are used to analyse the filtering techniques. The results show the Butterworth filter a

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Kim, Chan-Ki, Jin-Young Kim, and Jin-Chul Sin. "TRV Analysis for AC Filter Circuit Breaker in HVDC System." Transactions of the Korean Institute of Power Electronics 20, no. 4 (2015): 369–74. http://dx.doi.org/10.6113/tkpe.2015.20.4.369.

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Senini, S., and P. J. Wolfs. "The coupled inductor filter: analysis and design for AC systems." IEEE Transactions on Industrial Electronics 45, no. 4 (1998): 574–78. http://dx.doi.org/10.1109/41.704884.

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Indrasari, Widyaningrum, Mitra Djamal, Wahyu Srigutomo, and Nur Hadziqoh. "High Sensitivity Fluxgate Sensor for Detection of AC Magnetic Field: Equipment for Characterization of Magnetic Material in Subsurface." Advanced Materials Research 896 (February 2014): 718–21. http://dx.doi.org/10.4028/www.scientific.net/amr.896.718.

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A magnetic material characterization at subsurface of soil using portable controlled source electromagnetic (CSEM) methods needs a continuous signal which has frequency more than 1 kHz. This signal can be obtained from the function generator which its output was amplified by a power amplifier with a gain of 16 times. The AC output current of the power amplifier can be varied from 0.1 A 0.45 A at frequency of 5 kHz. To generate an AC magnetic field, the output of the power amplifier is then connected to the solenoid with a ferrite-core coils number of 130 and diameter of 3 cm. The AC magnetic f

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Podder, Prajoy, Md Mehedi Hasan, Md Rafiqul Islam, and Mursalin Sayeed. "Design and Implementation of Butterworth, Chebyshev-I and Elliptic Filter for Speech Signal Analysis." International Journal of Computer Applications 98, no. 7 (2014): 12–18. http://dx.doi.org/10.5120/17195-7390.

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Mahdi Khafaga, Ali S. "Performance Analysis and Comparison of narrowband noise passing through filter types (Elliptic) and (Butterworth)." Journal of Physics: Conference Series 1973, no. 1 (2021): 012009. http://dx.doi.org/10.1088/1742-6596/1973/1/012009.

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Subhashini, N., and A. Brintha Therese. "Performance Analysis of Different Electrical Filters in 10G Hybrid Passive Optical Network." International Journal of Engineering & Technology 7, no. 4 (2018): 6652. http://dx.doi.org/10.14419/ijet.v7i4.15758.

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With growing number of applications and network traffic, optic fibers are extensively used in the access part of the network. Passive Optical Networks (PON) in particular, Ethernet PON (EPON) networks based on Time Division Multiple Access (TDMA) are more prominently used in many parts of the world. Though Wavelength Division Multiplexing (WDM) PON has its own advantages, considering the cost and utilisation of such networks in the access part makes it less useful. On the other hand, Hybrid PON network combines the advantages of both EPON and WDM PON Networks. The objective of this paper is to

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Kubanek, David, Jaroslav Koton, Jan Jerabek та Darius Andriukaitis. "(N + α)-Order low-pass and high-pass filter transfer functions for non-cascade implementations approximating butterworth response". Fractional Calculus and Applied Analysis 24, № 3 (2021): 689–714. http://dx.doi.org/10.1515/fca-2021-0030.

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Abstract The formula of the all-pole low-pass frequency filter transfer function of the fractional order (N + α) designated for implementation by non-cascade multiple-feedback analogue structures is presented. The aim is to determine the coefficients of this transfer function and its possible variants depending on the filter order and the distribution of the fractional-order terms in the transfer function. Optimization algorithm is used to approximate the target Butterworth low-pass magnitude response, whereas the approximation errors are evaluated. The interpolated equations for computing the

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Mohd Nor, Nurul Izza, Kriyang Shah, Jack Singh, and Zaliman Sauli. "Film Bulk Acoustic Wave Resonator Filter for Ku-Band Applications." Applied Mechanics and Materials 321-324 (June 2013): 1614–19. http://dx.doi.org/10.4028/www.scientific.net/amm.321-324.1614.

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The design and analysis of Ku-band ladder-type filters based on film bulk acoustic wave resonator (FBAR) is presented. The proposed FBAR filter has an insertion loss of-3dB, out-of-band rejection of-12dB, centre frequency of 15.5GHz with 3dB bandwidth of 1.0GHz. Based on the characteristics of the FBAR filter, the expected characteristics of FBAR resonators are determined by using the Butterworth Van Dyke (BVD) equivalent circuit.

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DJORDJEVIĆ, ANTONIJE, DEJAN TOŠIĆ, and MILICA DJURIĆ-JOVIČIĆ. "A THEOREM ON REPEATED FILTERING." Journal of Circuits, Systems and Computers 23, no. 10 (2014): 1450136. http://dx.doi.org/10.1142/s0218126614501369.

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Repeatedly passing a signal through a low-pass filter may resemble using a Gaussian or hyper-Gaussian filter. Conditions are established for this resemblance. A theorem on approximation of Gaussian and hyper-Gaussian filters by a cascade of simple filters is established and the corresponding phase and group delay characteristics are analyzed. The theorem and the analysis are exemplified by cascading moving-average filters and the first-order Butterworth filters.

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Guo, Fei, Mai Yu Zhou, Mei Zhao, Xiu Yng Fan, and Man Zhao. "Filtering of Digital Hologram." Advanced Materials Research 710 (June 2013): 763–67. http://dx.doi.org/10.4028/www.scientific.net/amr.710.763.

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With the development of computer technology and high-resolution charge coupled device (CCD), digital holography is widely used. However, there are noises in digital hologram inevitably, which is very unfavorable to reconstruct hologram and analysis fringes. From two aspects: frequency domain and space domain, we adopted mean filter, medium filter and Butterworth low-pass filter to remove the noise in digital hologram obtained with experiment. The experimental result showed that digital hologram was clearer and its contrast was enhanced. There was better reconstructing effect.

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SU, HSIAO WEI, and YICHUANG SUN. "PERFORMANCE ANALYSIS AND COMPARISON OF MULTIPLE LOOP FEEDBACK OTA-C FILTERS." Journal of Circuits, Systems and Computers 14, no. 04 (2005): 685–720. http://dx.doi.org/10.1142/s0218126605002581.

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This paper is concerned with performance analysis and comparison of multiple loop feedback (MLF) operational transconductance amplifier and capacitor (OTA-C) filters. General formulas for analysis of sensitivity, maximum input signal and noise based on the matrix method of MLF OTA-C filters are derived for canonical and noncanonical all-pole and finite transmission zero architectures. These formulas can be readily used for performance evaluation of any MLF filters. For illustrating the use of the formulas and comparison of different structures, the performances of inverse-follow-the-leader-fee

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Desai, Vishal, Srisowmya Sanisetty, Benjamin Steber, et al. "Intermediate Frequency AC Signal Analysis for Bionanosensor." Journal of Nanotechnology 2011 (2011): 1–9. http://dx.doi.org/10.1155/2011/617196.

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Nanobiosensors are devices which incorporate nanomaterials to detect miniscule quantities of biological and chemical agents. The authors have already developed a novel bionanosensor (BNS) for quick, efficient, and precise detection of bacterial pathogens using the principles of CNT-DNA interaction and DNA hybridization. The detection ability of the (BNS) was observed to be independent of the device resistance. Two new methods (low-pass filter (LPF) and curve fitting (CF)) were developed for better analysis of the BNS. These methods successfully model the BNS. Evidence is provided to elucidate

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Yu, Bing, David Gabriel, Larry Noble, and Kai-Nan An. "Estimate of the Optimum Cutoff Frequency for the Butterworth Low-Pass Digital Filter." Journal of Applied Biomechanics 15, no. 3 (1999): 318–29. http://dx.doi.org/10.1123/jab.15.3.318.

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The purposes of this study were (a) to develop a procedure for objectively determining the optimum cutoff frequency for the Butterworth low-pass digital filler, and (b) to evaluate the cutoff frequencies derived from the residual analysis. A set of knee flexion-extension angle data in normal gait was used as the standard data set. The standard data were sampled at different sampling frequencies. Random errors with different magnitudes were added to the standard data to create different sets of raw data with a given sampling frequency. Each raw data set was filtered through a Butterworth low-pa

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Lee, Kyoung-Jun, Honnyong Cha, Jong-Pil Lee, Dong-Wook Yoo, and Hee-Je Kim. "Experimental and Numerical Analysis of a Simple Core Loss Calculation for AC Filter Inductor in PWM DC-AC Inverters." Journal of Power Electronics 13, no. 1 (2013): 113–21. http://dx.doi.org/10.6113/jpe.2013.13.1.113.

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Yiming, Ji, Wu Fangjie, and Huang Yong. "Analysis of the influence of the filter breaker restrike on the AC filters." Journal of Engineering 2019, no. 16 (2019): 2663–69. http://dx.doi.org/10.1049/joe.2018.8651.

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Zhu, Xiao Jun, Tao Chen, Wei Fang, Luo Jiang Qian, and Yi Yu Wen. "RTDS-Based Simulate Analysis of AC Filters Switch Method in HVDC Converter for Voltage Stability." Advanced Materials Research 756-759 (September 2013): 4250–53. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.4250.

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In most of the AC-DC hybrid power transmission system AC filters is widely applied to stabilize voltage level in addition to filter harmonic. However, the voltage stability of AC bus is greatly influenced by action sequence of switching AC filters in group. The paper presents the concept of reactive characteristics of the convertor and AC filters, using reactive and voltage control mode to switch them. The modeling, control, and principle of operation for the AC-side switching filters are described. The voltage level is controlled via regulating action of switching filters by step. The salient

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Barginear, M. F., M. L. Lesser, M. Strakhan, et al. "Anticoagulation vs. vena caval filters in cancer patients with venous thromboembolism: Improved survival with anticoagulation." Journal of Clinical Oncology 24, no. 18_suppl (2006): 8553. http://dx.doi.org/10.1200/jco.2006.24.18_suppl.8553.

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8553 Background: Cancer patients (pts) have an increased incidence of venous thromboembolism (VTE). Inferior vena caval (IVC) filters are used extensively in the US; over 40,000 are inserted annually. The impact on survival of cancer pts receiving IVC filters has not been studied. Methods: A retrospective study examined 154 consecutive cancer pts with VTE in order to compare the effects of IVC filter placement with anticoagulation (AC) therapy on overall survival (OS), as measured from the time of VTE. Pts were classified into three treatment groups: AC (n=58), IVC filter (73), or combination

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Huang, Zhenzhen, Qiang Niu, and Shuo Xiao. "Human Behavior Recognition Based on Motion Data Analysis." International Journal of Pattern Recognition and Artificial Intelligence 34, no. 09 (2019): 2056005. http://dx.doi.org/10.1142/s0218001420560054.

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The development of sensor technologies and smart devices has made it possible to realize real-time data acquisition of human beings. Human behavior monitoring is the process of obtaining activity information with wearables and computer technology. In this paper, we design a data preprocessing method based on the data collected by a single three-axis accelerometer. We first use Butterworth filter as low-pass filtering to remove the noise. Then, we propose a KGA algorithm to remove abnormal data and smooth them at the same time. This method uses genetic algorithm to optimize the parameters of Ka

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En, De, Yang Yang Liu, Na Na Wei, Huang He Wei, and Xiao Guang Chen. "Analysis of AC Chopping Control Voltage Regulation Circuit and MATLAB Simulation." Applied Mechanics and Materials 143-144 (December 2011): 164–68. http://dx.doi.org/10.4028/www.scientific.net/amm.143-144.164.

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In the power electronic circuits, AC chopping control voltage regulation circuit through change the chopped device conduction time, it can easily change output voltage size. Load currents do not include low-order harmonic, they contain only higher harmonic which are relevant to the switch period , they are easy to filter out. So the power efficiency is high and it is characterized of high performance. This paper introduces a kind of widely used AC chopping control voltage regulation circuit and we simulate it by simulink. The result fully embodies the superiority of this kind of circuit.

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Sanders, Ross H., Barry D. Wilson, and Robert K. Jensen. "Accuracy of Derived Ground Reaction Force Curves for a Rigid Link Human Body Model." International Journal of Sport Biomechanics 7, no. 4 (1991): 330–43. http://dx.doi.org/10.1123/ijsb.7.4.330.

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This study investigated whether force data could be derived accurately using segment inertia data determined by the elliptical zone method (Jensen, 1976), automatic digitizing from high-speed video using a Motion Analysis VP110 system, and for an activity that does not require flexion of the thorax. The criterion fonctions were the force-time records of the jumps recorded at 500 Hz by a Kistler 9281B force platform. A second-order Butterworth digital filter was used to smooth the derived data, with frequency cutoffs being selected on the basis of root mean square error of the smoothed function

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Han, Jingang, Shuoshuo Sun, Shouzhi Zheng, Yang Gao, Yide Wang, and TianHao Tang. "FFT-based selective harmonic current control of AC filter capacitors for audible noise analysis." Measurement and Control 54, no. 3-4 (2021): 408–16. http://dx.doi.org/10.1177/00202940211000078.

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With the development of High Voltage Direct Current (HVDC) and ultra HVDC, a growing number of high voltage film filter capacitors have been installed for harmonic suppression. But the capacitors generate severe audible noise in the converters, which has become more and more serious. Then it is important to imitate the practical working situation of capacitors for the research of noise characteristics to improve the capacitive performance in lab. In this paper, a FFT-based harmonic current control method is proposed for audible noise analysis of AC filter capacitor. Firstly, mathematical model

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HWANG, YUH-SHYAN, JIANN-JONG CHEN, and JEN-HUNG LAI. "A FULLY DIFFERENTIAL THIRD-ORDER VHF Gm–C FILTER BASED ON LINEAR TRANSFORMATION TECHNIQUES." Journal of Circuits, Systems and Computers 16, no. 02 (2007): 221–31. http://dx.doi.org/10.1142/s0218126607003587.

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A fully differential third-order very high frequency (VHF) Gm–C filter based on linear transformation (LT) techniques is presented in this paper. The systematic design method and the procedure are developed to realize LT Gm–C filters efficiently. A third-order Butterworth lowpass filter embedded bandgap and bias circuits with 200 MHz cutoff frequency is implemented in the TSMC 0.18 μm 1P6M process. The total harmonic distortion (THD) of the proposed filter is - 43 dB with input signal 0.5 V p-p and output loading capacitance 1 pF at 200 MHz. Power dissipation is 9.77 mW under 1.8 V supply volt

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Jin, Ou Yang, Yan Song Li, and Jun Liu. "Research of Signal Processing Based on Kalman Filter and Particle Filter." Applied Mechanics and Materials 548-549 (April 2014): 1080–84. http://dx.doi.org/10.4028/www.scientific.net/amm.548-549.1080.

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The current transducer is the premise condition of electricity measurement, relay protection, monitoring and diagnosis system, and power system analysis. This paper introduces the principle and signal to noise characteristics of optical current transducer (OCT), which is based on Faraday Magneto-optic effect. Then, proposed uses the kalman filter and particle filtering method to improve the output SNR of OCT, for the OCT has a low SNR. At last, Establish the both particle filter dynamic model for AC and DC situation, After choosing appropriate parameters of the kalman filtering and particle fi

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Abdullah, Shahrum, Edisah Putra Teuku, Zaki Nuawi Mohd., and Mohd Nopiah Zulkifli. "Vibrational Fatigue Analysis of a Strain Loading Using the Frequency and Wavelet Filtering Methods." Key Engineering Materials 462-463 (January 2011): 124–29. http://dx.doi.org/10.4028/www.scientific.net/kem.462-463.124.

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This paper presents a comparison work between the filtering methods of fatigue strain loadings using the frequency spectrum and the wavelet transform (WT), in which a raw loading signal can be simplified for purpose of simulation. For this reason, the Fast Fourier Transform (FFT) and the Morlet wavelet algorithms were used in order to transform the vibrational fatigue time series into the frequency domain signal, leading to the observation of the frequency characteristics of the signal. To retain high amplitude cycles in the FFT algorithm, a low pass filter technique was applied to remove the

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Iinuma, K., and M. Takebe. "Transport Analysis of RF Drift-velocity Filter Employing Crossed DC and AC Electric Fields for Ion Swarm Experiments." Australian Journal of Physics 48, no. 3 (1995): 491. http://dx.doi.org/10.1071/ph950491.

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The operational characteristics of the RF drift-velocity filter developed recently by us to separate a mixture of gaseous ions are examined theoretically. The solutions of the appropriate transport equations provide an analytical formula for the transmission efficiency of the filter in terms of the mobility and diffusion coefficient of the ions, the electric field strength, the RF frequency and the filter dimension. Using the experimental transport data for Li+ /Xe and Cs+ /Xe, the formula was tested and we find that it adequately accounts for the degree of ion separation achieved by the filte

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Liu, Xiao Gang, and Bing Zhao. "Based on the CO₂ Gas Shielded Welding Molten Pool Image Edge Detection Algorithm." Applied Mechanics and Materials 437 (October 2013): 840–44. http://dx.doi.org/10.4028/www.scientific.net/amm.437.840.

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This paper use the passive vision system through high-speed camera collects molten pool images; and then according to the frequency domain characteristics of the weld pool image Butterworth low-pass filter; gradient method for image enhancement obtained after pretreatment. Research Roberts, Sobel, Prewitt, Log, Zerocross, and Canny 6 both traditional differential operator edge detection processing results. Through comparison and analysis of choosing threshold for [0.1, 0. Canny operator can get the ideal molten pool edge character, for subsequent welding molten pool defect recognition provides

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Ionescu, Filip, Nwabundo Anusim, Eva Ma, et al. "Inferior Vena Cava Filter Retrieval Trends: A Single Center Experience." Blood 134, Supplement_1 (2019): 4690. http://dx.doi.org/10.1182/blood-2019-129366.

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Background: Inferior vena cava (IVC) filters are indicated in patients with deep vein thrombosis (DVT) or pulmonary embolism (PE) who either have contraindications to or have failed anticoagulation (AC). Given rising concerns about their safety and efficacy, the FDA has issued a communication urging clinicians to remove filters (optimally, within 90 days post-implantation). According to national data retrieval rates remain low. Our study aimed to assess IVC filter retrieval rates and factors that influence retrieval. Methods: This is a single center, retrospective cohort study of patients who

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CREBIER, Jean-Christophe, Thanh-Hai PHUNG, Van-Sang NGUYEN, et al. "DC-AC Isolated Power Converter Array. Focus on Differential Mode Conducted EMI." Electronics 8, no. 9 (2019): 999. http://dx.doi.org/10.3390/electronics8090999.

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This paper introduces the implementation of a DC–AC step up isolated converter from associations of bidirectional Conversion Standard Cells (CSCs). The designed multi-cell converter is an array of standardized converter cells. It is described and then compared to a reference converter with respect to differential mode conducted electro-magnetic interference (EMI). The paper outlines the motivation for developing a generic multi-cell approach before underlining the benefits from the point of view of conducted EMI when implementing power converter arrays (PCAs). In particular, it is shown that i

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Ye, Xijun, Xueshuai Chen, Yaxiong Lei, Jiangchao Fan, and Liu Mei. "An Integrated Machine Learning Algorithm for Separating the Long-Term Deflection Data of Prestressed Concrete Bridges." Sensors 18, no. 11 (2018): 4070. http://dx.doi.org/10.3390/s18114070.

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Deflection is one of the key indexes for the safety evaluation of bridge structures. In reality, due to the changing operational and environmental conditions, the deflection signals measured by structural health monitoring systems are greatly affected. These ambient changes in the system often cover subtle changes in the vibration signals caused by damage to the system. The deflection signals of prestressed concrete (PC) bridges are regarded as the superposition of different effects, including concrete shrinkage, creep, prestress loss, material deterioration, temperature effects, and live load

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Guo, Hong Tao, Bin Bin Lv, Li Yu, Yu Yan, and Xi Ping Kou. "Research on Data Processing Method for Continuously-Varying Dynamic Pressure Flutter Test." Applied Mechanics and Materials 397-400 (September 2013): 2177–81. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.2177.

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For the continuously-varying dynamic pressure flutter test data in the high-speed wind tunnel; this paper analyzes the strengths and weaknesses of the data Processing Method in this field. The data selection and stacking mode is improved. A Butterworth IIR digital filter is used for digital filtering. The power spectral density function is computed by Fourier transform of the autocorrelation function. A pick-hold method is used to predict the flutter critical point. It is indicated that our method features high accuracy and efficiency by theoretical analysis and wind tunnel flutter test.

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Díaz-Araujo, Marcolino Humberto, Aurelio Medina-Rios, Manuel Madrigal-Martínez, and Luis Arthur Cleary-Balderas. "Analysis of Grid-Connected Photovoltaic Generation Systems in the Harmonic Domain." Energies 12, no. 24 (2019): 4785. http://dx.doi.org/10.3390/en12244785.

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In this contribution, a harmonic domain (HD) model of grid-connected photovoltaic (PV) generation systems is proposed. The topology of the PV generation system contains a PV array connected to a DC/DC converter and a DC/AC converter, coupled to the grid through a filter. The individual components of the PV system are modeled in the HD. The PV array is represented as a Thevenin equivalent, whereas the DC/DC converter and the DC/AC converter are represented in the HD using switching function matrices. The periodic steady-state solution of the PV system is obtained through simple matrix/vector op

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Samman, Faizal Arya, Ma'arif Hasan, and Tirza Damayanti. "Side Effects of Damping Element Insertion in LCL Filter for DC/AC Inverter." International Journal of Power Electronics and Drive Systems (IJPEDS) 9, no. 1 (2018): 443. http://dx.doi.org/10.11591/ijpeds.v9.i1.pp443-456.

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The negative impacts or side effects of a damper circuit insertion in an LCL passive filter utilized to filter DC/AC inverters output voltage is presented in this paper. For comparative study, this paper discusses two damping configurations, namely series and parallel damping, as well as the LCL filter without damping element. Four criteria are used to explore the impacts of the damper circuits, i.e. their total harmonic distortions (THDs), the output voltage amplitude, the output power and the power efficiency. Theoretically and emphirically shown by previous studies, the damper can indeed re

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Tsybin, Yu N. "MONITORING THE AFR OF THE INFORMATION SIGNAL FILTER OF A FLUX-GATE MAGNETOMETER ON THE EXAMPLE OF A SINGLE LINK BUTTERWORTH FILTER." Kontrol'. Diagnostika, no. 257 (2019): 40–49. http://dx.doi.org/10.14489/td.2019.11.pp.040-049.

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The content of this paper relates to the field of monitoring the parameters of a magnetic field (MF) meter with a MF a fluxgate sensor. The article directly discusses the control method for the amplitude frequency response (AFR) of the second harmonic filter of an EMF fluxgate meter. The purpose of the work is to minimize the workplace (WP) equipment for magnetometer monitoring. We suggest an AFR monitoring method based on three readings. As an input signal source, while monitoring an AFR filter, we suggest the use of a WP fluxgate meter. The fluxgate meter is installed in a magnetic screen. T

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Tüzün, Reşat, and Nursel Akçam. "Design of Microstrip Low Pass Filters." Academic Perspective Procedia 1, no. 1 (2018): 47–55. http://dx.doi.org/10.33793/acperpro.01.01.13.

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Microstrip filters have a significant role in Radio Frequency/Microwave applications. Microstrip filters are common on microwave circuits, satellite communications, radars, test equipments and so on. Because microstrip filters are compact, cheap and easy to produce, they are highly preferred for microwave applications. Microwave filter; microwave system is a two-ported element used to control the frequency response at a certain point by attenuating the frequencies in the stop band by transmitting in the frequency band. Typical frequency responses are low pass, high pass, band pass and band sto

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Piplai, Tropita, Arun Kumar, and Babu J. Alappat. "Removal of mixture of ZnO and CuO nanoparticles (NPs) from water using activated carbon in batch kinetic studies." Water Science and Technology 75, no. 4 (2016): 928–43. http://dx.doi.org/10.2166/wst.2016.521.

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The aim of this study was to understand the effects of pH (5, 6, 7, 8, 9) and activated carbon (AC) concentration (0.01, 0.1, 1, 10, 100 g/L) on the removal of a colloidal solution of nanoparticles (NPs) (ZnO + CuO) using AC in batch kinetic studies. Results revealed that adsorption capacities of AC for Zn and Cu (individually) were 0.9 ± 0.028 mg/g (91.3% removal) and 0.95 ± 0.036 mg/g (95.6% removal) in deionized water and 0.6 ± 0.038 mg/g (78% removal) and 0.75 ± 0.078 mg/g (83% removal) in wastewater at pH 8 (Zn) and pH 6 (Cu) respectively. In a colloidal solution mixture of zinc oxide nan

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