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Journal articles on the topic 'Filters'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Trantham, E. Clark. "Minimum uncertainty filters for pulses." GEOPHYSICS 58, no. 6 (1993): 853–62. http://dx.doi.org/10.1190/1.1443469.

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The objective of this paper is to calculate filters with a minimum uncertainty, the product of filter length and bandwidth. The method is applicable to producing minimum uncertainty filters with time or frequency domain constraints on the filter. The calculus of variations is used to derive the conditions that minimize a filter’s uncertainty. The general solution is a linear combination of Hermite functions, where the Hermite functions are summed from low to high order until the filter’s constraints are met. Filters constrained to have zero amplitude at zero hertz have an uncertainty at least

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2

Ahmed, Osman, Shermeen Sheikh, Patrick Tran, et al. "Inferior Vena Cava Filter Evaluation and Management for the Diagnostic Radiologist: A Comprehensive Review Including Inferior Vena Cava Filter-Related Complications and PRESERVE Trial Filters." Canadian Association of Radiologists Journal 70, no. 4 (2019): 367–82. http://dx.doi.org/10.1016/j.carj.2019.06.003.

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Inferior vena cava filters are commonly encountered devices on diagnostic imaging that were highlighted in a 2010 Food and Drug Administration safety advisory regarding their complications from long-term implantation. The Predicting the Safety and Effectiveness of Inferior Vena Cava Filters (PRESERVE) trial is an ongoing after-market study investigating the safety and utility of commonly utilized filters in practice today. While most of these filters are safe, prompt recognition and management of any filter-associated complication is imperative to prevent or reduce the morbidity and mortality

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Li, Luping, Lijuan Dong, Peng Chen, and Kai Yang. "Multi-band rejection filters based on spoof surface plasmon polaritons and folded split-ring resonators." International Journal of Microwave and Wireless Technologies 11, no. 08 (2019): 774–81. http://dx.doi.org/10.1017/s1759078719000369.

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AbstractA dualband rejection filter and a triband rejection filter are proposed in this letter, both of which are implemented by cascading spoof surface plasmon polaritons (SSPPs) of the same structure but with diverse rejection bands. Compared with traditional ones, the proposed filters provide more compact structures, wider rejection bands, and better independent tunability. In the proposed filters, the rejection bandwidth, the center frequency of the rejection band and the filter's cutoff frequency can be adjusted independently. And the different rejection bands in the same filter also can

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Wang, Wenli, and Philip Winters. "Statistically Significant Efficiency Testing of HEPA Filters." Journal of the IEST 47, no. 1 (2004): 101–6. http://dx.doi.org/10.17764/jiet.47.1.bq380t6134311822.

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High Efficiency Particulate Air (HEPA) filter manufacturers must ensure the accuracy of efficiency testing for these filters and, at the same time, keep productivity at a reasonable level. This study describes tests conducted to determine the minimum time required to provide statistically significant efficiencies of HEPA filters using a test system currently in use of HEPA filter production. The test results of over 300 HEPA filters were analyzed in this study. The approaches in IEST RP-CC-007.1: Testing ULPA Filters for statistical analysis of particle counts were followed. A Poisson distribu

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Hruschka, Crassen, Udo Barabas, and Lutz Gohler. "Optical narrow band filter without resonance's." Facta universitatis - series: Electronics and Energetics 17, no. 2 (2004): 209–17. http://dx.doi.org/10.2298/fuee0402209h.

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This paper introduces an optical wave filter, which uses gratings at 45? or 135? inclined grating lines that avoid any resonance's. Therefore, many more options to form the filter shape exist. In general, the filter design can be traced to that of transversal filters (finite impulse response filter, FIR filter). Such an integrated optical wave filter is characterized by steep filter slopes and a narrow pass band (less then 01nm) combined with a high stop band attenuation (more than 40dB) and a linear phase response in the pass band. Compared to conventional Bragg grating filters, the inclined

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6

Wang, Shuaijie, Haitao Wang, Xuefeng Qiu, et al. "Study on the Performance of Filters Under Biogas Slurry Drip Irrigation Systems." Agriculture 15, no. 1 (2024): 30. https://doi.org/10.3390/agriculture15010030.

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Filters are essential components for maintaining the stability of drip irrigation systems, effectively reducing the risk of clogging. However, when applied to slurry drip irrigation systems, the complexity of slurry water quality makes it unclear how different filter types and their combinations affect the hydraulic performance of the system. This study provides a comprehensive performance evaluation of two common filter types and their combinations, considering various flow rates and biogas slurry-to-water ratios under drip irrigation conditions. The results revealed the following key finding

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Wen, Richard, Hunter McCoy, David Tench, et al. "Adaptive Quotient Filters." Proceedings of the ACM on Management of Data 2, no. 4 (2024): 1–28. http://dx.doi.org/10.1145/3677128.

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Filters trade off accuracy for space and occasionally return false positive matches with a bounded error. Numerous systems use filters in fast memory to avoid performing expensive I/Os to slow storage. A fundamental limitation in traditional filters is that they do not change their representation upon seeing a false positive match. Therefore, the maximum false positive rate is only guaranteed for a single query, not for an arbitrary set of queries. We can improve the filter's performance on a stream of queries, especially on a skewed distribution, if we can adapt after encountering false posit

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Kang, Wei, Li Xia Zhang, and Ji Bo Wan. "Matching Characteristic of Constant Voltage Source Excited Filter in Power System." Applied Mechanics and Materials 427-429 (September 2013): 1072–75. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.1072.

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Filters between voltage source converter and the batteries in power system can be categorized into constant voltage source excited filters. The paper discusses the importance of the matched structure and parameters for power filters. The relation between matched structure and filters output characteristic is demonstrated and the design principle is introduced. The work above proved that even if the filters are designed for the same transfer function, so long as filters load resistance is different, their designed parameters are also different. Traditional power system filter seldom consider it

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Prasad, K. D., and R. Ramadevi. "Analysis and Comparison of Image Enhancement Techniques for Improving PSNR of Liver Images by Median Filtering over Mask Filtering." CARDIOMETRY, no. 25 (February 14, 2023): 990–95. http://dx.doi.org/10.18137/cardiometry.2022.25.990-995.

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Aim: The goal of this research is to employ median filters and mask filters to reduce noise in liver images so that they can be improved. In addition, the Peak Signal to Noise Ratio of both filters’ outputs was examined (PSNR). Materials and Methods: The afflicted and normal liver photos were obtained from the Kaggle website for this investigation. Then, using Matlab software, the mask filtering and median filtering algorithms were run. Clinicalc. com was used to compute sample size, and SPSS software was used to conduct the comparative analysis. This study has two groups, each with a sample s

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Khandelwal, Achala, and Pragya Nema. "Application of PI controller based active filter for harmonic mitigation of grid-connected PV-system." Bulletin of Electrical Engineering and Informatics 10, no. 5 (2021): 2377–83. http://dx.doi.org/10.11591/eei.v10i5.2907.

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The recent trends show the interconnection of PV system with electric grid. With this configuration the issue of harmonics comes into existence. The mounting figure of power-electronic instruments has formed considerable impression on the power-quality of electric supply. Harmonics deformations have conventionally been handled amid the application of passive-LC filters. Active Filter has emerged as a good substitute for passive filters to reduce the harmonics to great extent as it has numerous benefits over the former filters. The active filter’s most vital part is the applied control strategi

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Lu, Feng, Yihuan Huang, Jinquan Huang, and Xiaojie Qiu. "Gas turbine performance monitoring based on extended information fusion filter." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 2 (2018): 483–97. http://dx.doi.org/10.1177/0954410018776398.

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Performance monitoring is a critical issue for gas turbine engine for improving the operation safety and reducing the maintenance cost. With regard to this, variants of Kalman-filters-based state estimation have been employed to detect gas turbine performance, but the classical centralized Kalman filters are subject to heavy computational effort and poor fault tolerance. A novel nonlinear fusion filter algorithm using information description with distributed architecture is proposed and applied to gas turbine performance monitoring. This methodology is developed from federated Kalman filter, a

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Mewada, Hiren K., and Jitendra Chaudhari. "Low computation digital down converter using polyphase IIR filter." Circuit World 45, no. 3 (2019): 169–78. http://dx.doi.org/10.1108/cw-02-2019-0015.

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Purpose The digital down converter (DDC) is a principal component in modern communication systems. The DDC process traditionally entails quadrature down conversion, bandwidth reducing filters and commensurate sample rate reduction. To avoid group delay, distortion linear phase FIR filters are used in the DDC. The filter performance specifications related to deep stopband attenuation, small in-band ripple and narrow transition bandwidth lead to filters with a large number of coefficients. To reduce the computational workload of the filtering process, filtering is often performed as a two-stage

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Ross, Hunter, Huyen Nguyen, Brian Nguyen, et al. "Filter Modified with Hydrophilic and Oleophobic Coating for Efficient and Affordable Oil/Water Separation." Separations 9, no. 10 (2022): 269. http://dx.doi.org/10.3390/separations9100269.

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To mitigate the damage of oil spills, a filter modified with a hydrophilic and oleophobic coating is proposed for affordable and efficient oil separation and recovery from water. The sol–gel method was chosen to produce a colloidal suspension of titanium dioxide particles for its ease of production and its versatility in application for many different substrates, including paper and cloth fabric. After immersing the substrates into a titanium-containing solution, three techniques were applied to increase the production of titanium dioxide—microwave-assisted, refrigeration, and ultra-sonication

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Chen, Zhimin, and Lenan Wu. "Design of Special Impacting Filter for Multicarrier ABPSK System." Mathematical Problems in Engineering 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/921932.

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A rather intuitive technique known as pole-zero placement is introduced to illustrate the frequency response of the special impacting filters (SIFs) with a pair of conjugate zero-poles and deduce the equation of the pole radii. Based on that, the paper proposes an iterative scheme to derive the parameters of the cascade notch filter. The cost function is determined by the cascading notch filter’s influence on impacting filters, converting the cost function’s least square problem to a filter parameters’ standard quadratic programming problem. Finally, a cascading notch SIF (CNSIF) designed to d

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15

HAAVISTO, P., M. GABBOUJ, and Y. NEUVO. "MEDIAN BASED IDEMPOTENT FILTERS." Journal of Circuits, Systems and Computers 01, no. 02 (1991): 125–48. http://dx.doi.org/10.1142/s0218126691000021.

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Idempotent filters produce a root signal in a single filter pass, i.e. the filter output is invariant to further filterings with the same filter. In this paper median based idempotent filter structures are introduced. Two approaches to generate these filters are studied: weighted median filters and median filter cascades. Two subclasses of n-dimensional idempotent weighted median filters, called Class 1 and Class 2 filters in the paper, are introduced. It is shown that both Class 1 and Class 2 filters suppress impulsive noise from n-dimensional input signals and yet have almost no effect on th

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Deeds, Kyle, Brian Hentschel, and Stratos Idreos. "Stacked filters." Proceedings of the VLDB Endowment 14, no. 4 (2020): 600–612. http://dx.doi.org/10.14778/3436905.3436919.

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We present Stacked Filters, a new probabilistic filter which is fast and robust similar to query-agnostic filters (such as Bloom and Cuckoo filters), and at the same time brings low false positive rates and sizes similar to classifier-based filters (such as Learned Filters). The core idea is that Stacked Filters incorporate workload knowledge about frequently queried non-existing values. Instead of learning, they structurally incorporate that knowledge using hashing and several sequenced filter layers, indexing both data and frequent negatives. Stacked Filters can also gather workload knowledg

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Koigerov, A. S. "Analytical Approach to Designing a Combined-Mode Resonator Filter on Surface Acoustic Waves Using the Model of Coupling of Modes." Journal of the Russian Universities. Radioelectronics 25, no. 2 (2022): 16–28. http://dx.doi.org/10.32603/1993-8985-2022-25-2-16-28.

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Introduction. Bandpass filters are important components that determine the basic characteristics of transmitting and receiving radio electronic equipment. Such filters implemented on surface acoustic waves (SAW) not only demonstrate excellent electrical parameters, but also meet compactness requirements. The relevant research task of reducing the design time and optimizing the filter’s cost can be solved by either using modern computational software or improving existing modeling tools.Aim. To describe the current state and main features of approaches to calculating SAW-based bandpass filters

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Koigerov, A. S. "Analytical Approach to Designing a Combined-Mode Resonator Filter on Surface Acoustic Waves Using the Model of Coupling of Modes." Journal of the Russian Universities. Radioelectronics 25, no. 2 (2022): 16–28. http://dx.doi.org/10.32603/1993-8985-2022-25-2-16-28.

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Introduction. Bandpass filters are important components that determine the basic characteristics of transmitting and receiving radio electronic equipment. Such filters implemented on surface acoustic waves (SAW) not only demonstrate excellent electrical parameters, but also meet compactness requirements. The relevant research task of reducing the design time and optimizing the filter’s cost can be solved by either using modern computational software or improving existing modeling tools.Aim. To describe the current state and main features of approaches to calculating SAW-based bandpass filters

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Ahmed, Mohammed Moyed. "Adaptive Digital Notch Filter for Enhanced Stability in Grid-Connected Inverter Systems." Acta Universitatis Sapientiae, Electrical and Mechanical Engineering 16 (January 8, 2025): 110–23. https://doi.org/10.47745/auseme-2024-0010.

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Grid-connected inverters with LCL filters are crucial components in renewable energy systems, but they face stability challenges due to varying grid impedances and resonant frequencies. This paper presents a novel adaptive digital notch filter designed to enhance the stability of such systems across a wide range of operating conditions. The proposed filter employs a three-step adaptive mechanism: resonance detection, determination of resonant frequency change direction, and dynamic notch frequency adjustment. A comprehensive stability analysis in the z-plane reveals the behavior of the resonan

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Gülünay, Necati. "Noncausal spatial prediction filtering for random noise reduction on 3-D poststack data." GEOPHYSICS 65, no. 5 (2000): 1641–53. http://dx.doi.org/10.1190/1.1444852.

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A common practice in random noise reduction for 2-D data is to use pseudononcausal (PNC) 1-D prediction filters at each temporal frequency. A 1-D PNC filter is a filter that is forced to be two sided by placing a conjugate‐reversed version of a 1-D causal filter in front of itself with a zero between the two. For 3-D data, a similar practice is to solve for two 2-D (causal) one‐quadrant filters at each frequency slice. A 2-D PNC filter is formed by putting a conjugate flipped version of each quadrant filter in a quadrant opposite itself. The center sample of a 2-D PNC filter is zero. This pape

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Shaikh, Saba S., Suneel D. Kamath, Debashis Ghosh, Robert J. Lewandowski, and Brandon J. McMahon. "Safety and Outcomes of Permanent and Retrievable Inferior Vena Cava Filters in the Oncology Population." International Journal of Vascular Medicine 2020 (February 5, 2020): 1–7. http://dx.doi.org/10.1155/2020/6582742.

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Background. The role for inferior vena cava (IVC) filters in the oncology population is poorly defined. Objectives. Our primary endpoint was to determine the rate of filter placement in cancer patients without an absolute contraindication to anticoagulation and the rate of recurrent VTE after filter placement in both retrievable and permanent filter groups. Patients/Methods. A single-institution, retrospective study of patients with active malignancies and acute VTE who received a retrievable or permanent IVC filter between 2009-2013. Demographics and outcomes were confirmed on independent cha

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Piciu, Dana, Christina Theresia Dan, and Anca Dina. "Gődel filters in residuated lattices." Analele Universitatii "Ovidius" Constanta - Seria Matematica 29, no. 1 (2021): 183–200. http://dx.doi.org/10.2478/auom-2021-0012.

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Abstract In this paper, in the spirit of [4], we study a new type of filters in residuated lattices : Gődel filters. So, we characterize the filters for which the quotient algebra that is constructed via these filters is a Gődel algebra and we establish the connections between these filters and other types of filters. Using Gődel filters we characterize the residuated lattices which are Gődel algebras. Also, we prove that a residuated lattice is a Gődel algebra (divisible residuated lattice, MTL algebra, BL algebra) if and only if every filter is a Gődel filter (divisible filter, MTL filter, B

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Lee, Min-Jeong, Hyeon-Ju Kim, Du-Hong Kang, Jung Woo Lee, and Jung-Yeul Yun. "Microstructure and Pore Characteristics of a Double-Layered Pore Structure Powder Filter Fabricated by the WPS Process." Metals 14, no. 6 (2024): 665. http://dx.doi.org/10.3390/met14060665.

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In order to supply high-purity process gas in the semiconductor manufacturing process, a gas filter is used to remove particles that may be contained in the gas. However, because the gas filters currently in use have simple pore structures, there is a need to increase filtration efficiency through the development of filters with complex pore structures. In this study, a metal powder filter with double-layered pores was manufactured using a Wet Powder Spraying process (WPS) to increase the filtering efficiency of gas filters used in semiconductor manufacturing. The effects of the mixing ratio o

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Yassin, Ali, Hocine Cherifi, Hamida Seba, and Olivier Togni. "Backbone extraction through statistical edge filtering: A comparative study." PLOS ONE 20, no. 1 (2025): e0316141. https://doi.org/10.1371/journal.pone.0316141.

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The backbone extraction process is pivotal in expediting analysis and enhancing visualization in network applications. This study systematically compares seven influential statistical hypothesis-testing backbone edge filtering methods (Disparity Filter (DF), Polya Urn Filter (PF), Marginal Likelihood Filter (MLF), Noise Corrected (NC), Enhanced Configuration Model Filter (ECM), Global Statistical Significance Filter (GloSS), and Locally Adaptive Network Sparsification Filter (LANS)) across diverse networks. A similarity analysis reveals that backbones extracted with the ECM and DF filters exhi

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Zhang, Xiaohong. "On Some Fuzzy Filters in Pseudo-BCIAlgebras." Scientific World Journal 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/718972.

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Some new properties of fuzzy associative filters (also known as fuzzy associative pseudo-filters), fuzzyp-filter (also known as fuzzy pseudo-p-filters), and fuzzya-filter (also known as fuzzy pseudo-a-filters) in pseudo-BCIalgebras are investigated. By these properties, the following important results are proved: (1) a fuzzy filter (also known as fuzzy pseudo-filters) of a pseudo-BCIalgebra is a fuzzy associative filter if and only if it is a fuzzya-filter; (2) a filter (also known as pseudo-filter) of a pseudo-BCIalgebra is associative if and only if it is ana-filter (also call it pseudo-afil

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Namdar, A. "Fuzzy n-fold fantastic filters on hoop algebras." Journal of Algebraic Hyperstructures and Logical Algebras 4, no. 2 (2023): 189–203. http://dx.doi.org/10.61838/kman.jahla.4.2.12.

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In this paper, first we introduce the concept of fuzzy n-fold positive implicative filters on hoop algebras and study some of properties. Next we define and study fuzzy n-fold fantastic filters on hoop algebras. Also, the relationship between fuzzy n-fold positive implicative filter and some other fuzzy filters likeness fuzzy n-fold implicative filter and fuzzy n-fold fantastic filters are investigated for example every fuzzy n-fold implicative filter is a fuzzy n-fold positive implicative filter on hoop algebras. Then we obtain some condition equivalent with fuzzy n-fold fantastic filters and

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Jurisic Bellotti, Maja, and Mladen Vucic. "Sparse FIR Filter Design Based on Signomial Programming." Elektronika ir Elektrotechnika 26, no. 1 (2020): 40–45. http://dx.doi.org/10.5755/j01.eie.26.1.23560.

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The goal of sparse FIR filter design is to minimize the number of nonzero filter coefficients, while keeping its frequency response within specified boundaries. Such a design can be formally expressed via minimization of l0-norm of filter’s impulse response. Unfortunately, the corresponding minimization problem has combinatorial complexity. Therefore, many design methods are developed, which solve the problem approximately, or which solve the approximate problem exactly. In this paper, we propose an approach, which is based on the approximation of the l0-norm by an lp-norm with 0 < p < 1

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Rietjens, Judith AC, Wichor M. Bramer, Eric CT Geijteman, Agnes van der Heide, and Wendy H. Oldenmenger. "Development and validation of search filters to find articles on palliative care in bibliographic databases." Palliative Medicine 33, no. 4 (2019): 470–74. http://dx.doi.org/10.1177/0269216318824275.

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Background: Healthcare professionals and researchers in the field of palliative care often have difficulties finding relevant articles in online databases. Standardized search filters may help improve the efficiency and quality of such searches, but prior developed filters showed only moderate performance. Aim: To develop and validate a specific search filter and a sensitive search filter for the field of palliative care. Design: We used a novel, objective method for search filter development. First, we created a gold standard set. This set was split into three groups: term identification, fil

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Jun, Y. B. "Implicative filters of equality algebras treated as fuzzy points." Journal of Algebraic Hyperstructures and Logical Algebras 6, no. 1 (2025): 13–26. https://doi.org/10.61838/kman.jahla.6.1.2.

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The notion of fuzzy points is used to study implicative filters in equality algebras. The concept of implicative (∈, ∈)-fuzzy filters is introduced, and its properties are investigated. The relationship between (∈, ∈)-fuzzy filters, implicative (∈, ∈)- fuzzy filters and positive implicative (∈, ∈)-fuzzy filters are established. Characterizations of implicative (∈, ∈)-fuzzy filters are discussed, and the conditions for the (positive implicative) (∈, ∈)-fuzzy filter to be an implicative (∈, ∈)-fuzzy filter are explored. The extension property for the implicative (∈, ∈)- fuzzy filter is establish

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Avram, Sebastian, and Radu Vasiu. "Passive Power Line Communication Filter Design and Benchmarking Using Scattering Parameters." Applied Sciences 13, no. 11 (2023): 6821. http://dx.doi.org/10.3390/app13116821.

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NB-PLC (narrowband power line communication) is a method of data communication that involves superimposing a relatively high-frequency signal (9 kHz to 500 kHz), which contains data, onto the power grid’s low frequency (50 to 60 Hz) signal. While using the existing power grid as a transmission medium is convenient, the power grid was not designed for this purpose, leading to challenges such as conducted emissions and infrastructure limitations. To overcome these technical challenges, passive filters are necessary. This article presents the design, simulation (using scattering parameters), and

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Jun, Young Bae, Sun Shin Ahn, and Kyoung Ja Lee. "Classes of Int-Soft Filters in Residuated Lattices." Scientific World Journal 2014 (2014): 1–12. http://dx.doi.org/10.1155/2014/595160.

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The notions of int-soft filters, int-softG-filters, regular int-soft filters, andMV-int-soft filters in residuated lattices are introduced, and their relations, properties, and characterizations are investigated. Conditions for an int-soft filter to be an int-softG-filter, a regular int-soft filter, or anMV-int-soft filter are provided. The extension property for an int-softG-filter is discussed. Finally, it is shown that the notion of anMV-int-soft filter coincides with the notion of a regular int-soft filter inBL-algebras.

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Duncan, Guy, and Greg Beresford. "Some analyses of 2-D median f-k filters." GEOPHYSICS 60, no. 4 (1995): 1157–68. http://dx.doi.org/10.1190/1.1443844.

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Two‐dimensional median filters can be designed so that they have properties similar to f-k fan filters. This is done by using the coefficients of a truncated impulse response of an f-k filter as the weight coefficients for the weighted median process. The filter is called a median f-k filter and can be used to discriminate between events on the basis of apparent velocity. The filter appears suitable as a poststack coherency filter because it produces less distortion at wavefield terminations than conventional f-k fan filters. One‐dimensional weighted median filters that include negative coeffi

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Khriji, L. "Vector Directional Distance Rational Hybrid Filters for Color Image Restoration." Journal of Engineering Research [TJER] 2, no. 1 (2005): 1. http://dx.doi.org/10.24200/tjer.vol2iss1pp1-12.

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A new class of nonlinear filters, called vector-directional distance rational hybrid filters (VDDRHF) for multispectral image processing, is introduced and applied to color image-filtering problems. These filters are based on rational functions (RF). The VDDRHF filter is a two-stage filter, which exploits the features of the vector directional distance filter (VDDF), the center weighted vector directional distance filter (CWVDDF) and those of the rational operator. The filter output is a result of vector rational function (VRF) operating on the output of three sub-functions. Two vector directi

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SHUI, PENG-LANG, and XIAO-LONG WANG. "2M-BAND INTERLEAVED DFT MODULATED FILTER BANKS WITH PERFECT RECONSTRUCTION." International Journal of Wavelets, Multiresolution and Information Processing 06, no. 04 (2008): 499–520. http://dx.doi.org/10.1142/s021969130800246x.

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In this paper, we propose a new family of perfect reconstruction (PR) complex filter banks, named interleaved discrete Fourier transform modulated filter banks (Interleaved DFT-FBs). In the filter banks, the analysis filters are generated by interlaced exponential modulating two different analysis prototype filters, and the synthesis filters are generated by two different synthesis prototype filters via the same manner. The filter banks have a simple polyphase structure similar to DFT modulated filter banks (DFT-FBs). More importantly, the proposed Interleaved DFT-FBs can achieve critically sa

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Maharta Pemayun, A. A. Gede, I. Nym Budiastra, and I. W. Rinas. "ANALISIS EFESIENSI TRAFO DAYA TERHADAP PENGOPERASIAN BEBERAPA JENIS HARMONIC FILTER." Jurnal SPEKTRUM 7, no. 4 (2020): 76. http://dx.doi.org/10.24843/spektrum.2020.v07.i04.p10.

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Nonlinear load is one of the causes of harmonics in utility systems. To reduce harmonicdistortion that appears, usually in utility systems, Harmonic Filters are operated such as:passive filters, active filters, series hybrid filters and hybrid shunt filters. Harmonic distortion thatoccurs will increase losses in the utility system. Losses that appear will affect the efficiency ofthe Power transformer being operated. From the analysis results, the order of the best to worstfilter efficiency is hybride filter (? = 97.26%), active filter (? = 96.72%) and passive filter (? =95.73%).

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Li, Luping, Lijuan Dong, Peng Chen, and Kai Yang. "A low insertion loss low-pass filter based on single comb-shaped spoof surface plasmon polaritons." International Journal of Microwave and Wireless Technologies 11, no. 08 (2019): 792–96. http://dx.doi.org/10.1017/s1759078719000564.

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AbstractThis paper presents a low insertion loss low-pass filter based on the spoof surface plasmon polariton (SSPP) with single comb-shape. Compared with traditional ones, the proposed filter provides lower insertion loss and return loss by optimizing the structural parameters of the mode conversion and SSPP parts. According to the measurement results, the average insertion loss of the fabricated filter is 0.41 dB and the return loss of which at the near-zero-hertz band is &lt;−25.9 dB. The S parameter comparison result between the unoptimized and optimized filters demonstrates that the o

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Schauland, Sam, Joerg Velten, and Anton Kummert. "Detection of Moving Objects in Image Sequences using 3D Velocity Filters." International Journal of Applied Mathematics and Computer Science 18, no. 1 (2008): 21–31. http://dx.doi.org/10.2478/v10006-008-0002-2.

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Detection of Moving Objects in Image Sequences using 3D Velocity FiltersA movement analysis of objects contained in visual scenes can be performed by means of linear multidimensional filters, which have already been analyzed in the past. While the soundness of the results was convincing, interest in those systems declined due to the limited computational power of contemporary computers. Recent advances in design and implementation of integrated circuits and hardware architectures allow realizing velocity filters if then-D system is carefully adapted to the analyzed problem. In this paper, the

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Wang, Zixuan. "Different Methods of Linear Phase IIR Filer Realization." Highlights in Science, Engineering and Technology 27 (December 27, 2022): 167–71. http://dx.doi.org/10.54097/hset.v27i.3739.

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Signal processing has become one of the most popular research topics. Researchers have designed a variety of digital filters to exclude unwanted random noises during the transmission or extract part of the signal in the desired range. There is a prevalent trend for digital filters to replace analog ones since they do not require hardwires. All the performances are operated on a single processor and are free from the effect of external factors. Finite impulse response (FIR) and infinite impulse response (IIR) filters in digital filters respectively provide infinite and finite impulse responses.

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Parameshappa, G., and D. Jayadevapp. "Efficient uniform digital filter bank with linear phase and FRM technique for hearing aids." International Journal of Engineering & Technology 7, no. 1.9 (2018): 69. http://dx.doi.org/10.14419/ijet.v7i1.9.9738.

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This paper attempts to present an uniform digital filter bank based on linear phase FIR and IIR filters applied for Frequency Response Masking (FRM) technique in hearing aid applications.In the proposed filter bank, nine uniformly spaced sub-bands are formed with the help of half band filters and masking filters. These nine channel FIR filter bank is realized using an interpolated half band linear phase FIR filter and an appropriate number of masking FIR filters. The nine channel IIR filter bank is realized using an interpolated half band approximately linear phase IIR filter and an appropriat

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Malleswari, V. S. Naga, G. Luka, Bhagyalakshmi Kothuru, T. Srinivasa Rao, and V. Amarendra Babu. "Application of Neutrosophic implicative filters and Neutrosophic positive implicative filters in Lattice implication algebra." International Journal of Neutrosophic Science 21, no. 1 (2023): 69–79. http://dx.doi.org/10.54216/ijns.210106.

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We introduced Neutrosophic implicative filters and Neutrosophic positive implicative filters in Lattice implication algebra. We proved some properties and equivalent conditions of both the filters. Finally we proved that “Every Neutrosophic positive implicative filter is a Neutrosophic implicative filter” and “Every Neutrosophic positive implicative filter is a Neutrosophic filter”.

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Lu, Hao, Xiaorun Hao, Ling Yang, et al. "Recent Advances in AlN-Based Acoustic Wave Resonators." Micromachines 16, no. 2 (2025): 205. https://doi.org/10.3390/mi16020205.

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AlN-based bulk acoustic wave (BAW) filters have emerged as crucial components in 5G communication due to their high frequency, wide bandwidth, high power capacity, and compact size. This paper mainly reviews the basic principles and recent research advances of AlN-based BAW resonators, which are the backbone of BAW filters. We begin by summarizing the epitaxial growth of single-crystal, polycrystalline, and doped AlN films, with a focus on single-crystal AlN and ScAlN, which are currently the most popular. The discussion then extends to the structure and fabrication of BAW resonators, includin

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Smirnov, A. V. "Optimization of digital filters performances simultaneously in frequency and time domains." Russian Technological Journal 8, no. 6 (2020): 63–77. http://dx.doi.org/10.32362/2500-316x-2020-8-6-63-77.

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Wide used method of digital filters design consists in transformation of analog filter-prototype with required performances into digital filter. This method is applicable if the transformation preserves optimality of filter performances under specified set of quality indexes (QI). It was denoted earlier that such situation is possible when gain-frequency response (GFR) and phase-frequency response are optimized simultaneously. The task of simultaneous optimization of digital filters GFR and step response (SR) is also important but yet a little explored. Alternative method of this problem solvi

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Kaufman, Amanda R., Lisa M. Casanova, and Mark D. Sobsey. "Efficacy of a ceramic siphon household water filter for removal of pathogenic microorganisms: lifespan volume test." Journal of Water, Sanitation and Hygiene for Development 1, no. 2 (2011): 102–11. http://dx.doi.org/10.2166/washdev.2011.037.

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Treatment of drinking water at the point of use (POU) has demonstrated health benefits for people who have access only to microbially contaminated drinking water. In this work, the ceramic siphon POU water filter was evaluated for its ability to reduce indicator microorganisms in test waters. During batch challenge tests, the filter reduced Escherichia coli in filtered water by 7 log10 (99.999987%) and bacteriophage MS2 by 0.12 log10 (24.0%). Next, a novel continuous flow dosing system allowing sewage-amended feed water to constantly pass through the filters allowed for determination of change

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Xin, Xiao Long, Peng Fei He, and Yong Wei Yang. "Characterizations of Some Fuzzy Prefilters (Filters) inEQ-Algebras." Scientific World Journal 2014 (2014): 1–12. http://dx.doi.org/10.1155/2014/829527.

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We introduce and study some types of fuzzy prefilters (filters) inEQ-algebras. First, we present several characterizations of fuzzy positive implicative prefilters (filters), fuzzy implicative prefilters (filters), and fuzzy fantastic prefilters (filters). Next, using their characterizations, we mainly consider the relationships among these special fuzzy filters. Particularly, we find some conditions under which a fuzzy implicative prefilter (filter) is equivalent to a fuzzy positive implicative prefilter (filter). As applications, we obtain some new results about classical filters inEQ-algebr

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Park, Jang Jin, Jin Myung Shin, Jae Hwan Yang, Young Hee Baek, and Geun Il Park. "Fabrication and performance of fl y ash granule filter for trapping gaseous cesium." Nukleonika 60, no. 3 (2015): 565–70. http://dx.doi.org/10.1515/nuka-2015-0104.

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Abstract Although a disk-type fly ash filter has shown a good performance in trapping gaseous cesium, it has difficulty in charging filters into a filter container and discharging waste filters containing radioactive cesium from a container by remote action. To solve the difficulty of the disk-type fly ash filter, five types of granule filters, including a ball type, tube type, and sponge-structure type have been made. Among them, the best filter type was chosen through simple crucible tests. The five types of granule filters packed into containers were loaded into five alumina crucibles of 50

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Satyanarayana, Dr S. V. V., K. Teja Sri, K. Madhavi, G. Jhansi, and B. Jaya Sri. "Design and Implementation of High Speed Low Power Decimation Filter for Hearing AID Applications." International Journal of Recent Technology and Engineering (IJRTE) 12, no. 1 (2023): 27–32. http://dx.doi.org/10.35940/ijrte.a7564.0512123.

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This work is focused on designing and implementing a decimation filter specifically intended for use in hearing aid applications. The filter utilizes distributed arithmetic (DA) and is described in this brief. Our proposal involves the development of a reconfigurable finite impulse response (FIR) filter, which utilizes both offset binary code (OBC) and binary distributed arithmetic (DA) techniques. Additionally, we utilize canonic signed digit (CSD) representation to develop decimation filters, which include the CIC filter, half band filter, and corrector filter. In this work, we have implemen

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Sotelo, Diana C., Nancy Ornelas-Soto, and Johann F. Osma. "Novel Magnetic Polymeric Filters with Laccase-Based Nanoparticles for Improving Congo Red Decolorization in Bioreactors." Polymers 14, no. 12 (2022): 2328. http://dx.doi.org/10.3390/polym14122328.

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In this work, five different magnetic biofilters, containing magnetic nanoparticles (142 nm), immobilized laccase on nanoparticles (190 nm) and permanent magnetic elements, such as neodymium magnets and metallic meshes, were designed, manufactured and tested. The five types of filters were compared by measuring the decolorization of Congo Red dye inside bioreactors, the half-life of the filters and the amount of magnetic nanoparticle and enzyme lost during multiple cycles of operation. Filters containing laccase immobilized on magnetite (Laccase-magnetite), permanent magnets and metallic mesh

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PAI, K. R., K. V. V. MURTHY, and V. RAMACHANDRAN. "COMPLEMENTARY POLE-PAIR FILTERS AND POLE-PARAMETER TRANSFORMATIONS." Journal of Circuits, Systems and Computers 06, no. 04 (1996): 319–50. http://dx.doi.org/10.1142/s0218126696000224.

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It is well known that the poles of a Butterworth filter (BF) are uniformly placed on the unit circle in the s-plane. If the order of the filter is a binary power (i.e., n=2k, k being an integer), then the pole-locations of such Butterworth filters exhibit very interesting symmetry properties in the s-plane. In this paper, first we point out that the pole-vectors of the Butterworth filters (of order n=2k) can be subjected to “prescribed symmetrical swinging”, such that certain symmetry properties present in the original pole-pattern can be maintained invariant. Then, we introduce a new family o

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Prijono, Wahju Adi, and Naufal Kurnia Rizki. "Perencanaan Rancang Bangun Microstrip Band Pass Filter dengan Struktur Tapped Input Hairpin pada Aplikasi Jaringan Mid-band 5G Telkomsel." Jurnal EECCIS (Electrics, Electronics, Communications, Controls, Informatics, Systems) 16, no. 1 (2022): 20–23. http://dx.doi.org/10.21776/jeeccis.v16i1.1492.

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Microstrip filter is a type of Radio Frequency (RF) filter that uses a thin electrical conductor separated from the ground plane by using a dielectric called the substrate. Microstrip filters are generally printed on Printed Circuit Boards or PCBs where high-frequency signals are directed from one part of the system to another with high efficiency. There are several types that can be applied to the operation of microstrip filters, one of which is a band pass filter. Band pass filter is a filter that can pass a signal with a certain frequency that is limited by a low cut-off frequency and a hig

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Biradar, Nagashettappa, M. L. Dewal, and Manoj Kumar Rohit. "Edge Preserved Speckle Noise Reduction Using Integrated Fuzzy Filters." International Scholarly Research Notices 2014 (October 30, 2014): 1–11. http://dx.doi.org/10.1155/2014/876434.

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Echocardiographic images are inherent with speckle noise which makes visual reading and analysis quite difficult. The multiplicative speckle noise masks finer details, necessary for diagnosis of abnormalities. A novel speckle reduction technique based on integration of geometric, wiener, and fuzzy filters is proposed and analyzed in this paper. The denoising applications of fuzzy filters are studied and analyzed along with 26 denoising techniques. It is observed that geometric filter retains noise and, to address this issue, wiener filter is embedded into the geometric filter during iteration

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