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Artykuły w czasopismach na temat „Filter technology”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Wu, Zongyang. "The Research on the Bandpass Filter for 5G N79 Band." Highlights in Science, Engineering and Technology 32 (February 12, 2023): 65–72. http://dx.doi.org/10.54097/hset.v32i.4942.

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With the continuous development of communication technology, 5G technology has gradually replaced the original 4G network and has been applied to all walks of life with its advantages of faster connection speed, lower delay, and larger capacity. The RF front-end market has also benefited from the prosperity of 5G, and filters are the most significant business segment in the RF front-end market. Filters are widely used in the 5G network technology hardware because it can significantly ensure the signal's integrity. The shield stripline bandpass filter and the high-resistance silicon-based bandp

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Shirokozhukhova, Anna, Sergey Kovalev, and Alexandr Ryazantsev. "Manufacturing Technology of Multilayer Metal Filters." E3S Web of Conferences 398 (2023): 01043. http://dx.doi.org/10.1051/e3sconf/202339801043.

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The article presents methods for obtaining micro-holes in the manufacture of fine metal filter elements. The analysis of the results of experimental studies of filter samples with holes made by electron beam and electroerosion perforation methods is carried out. The advantages of using multilayer structures in the manufacture of filters are substantiated. The research works carried out contribute to improving the manufacturability of products of new generations of technology, which is important for mechanical engineering.

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RAMÍREZ, JAVIER, UWE MEYER-BÄSE, and ANTONIO GARCÍA. "EFFICIENT RNS-BASED DESIGN OF PROGRAMMABLE FIR FILTERS TARGETING FPL TECHNOLOGY." Journal of Circuits, Systems and Computers 14, no. 01 (2005): 165–77. http://dx.doi.org/10.1142/s0218126605002131.

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FIR filters are routinely used in the implementation of modern digital signal processing systems. Their efficient implementation using commercially available VLSI technology is a subject of continuous study and development. This paper presents the residue number system (RNS) implementation of reduced-complexity and high-performance FIR filters, using modern Altera APEX20K field-programmable logic (FPL) devices. Index arithmetic over Galois fields and the Quadratic Residue Number System (QRNS), along with a selection of a small wordwidth modulus set, are the keys for attaining low complexity an

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Christensen, Morten Lykkegaard, Morten Møller Klausen, and Peter Vittrup Christensen. "Test of precoat filtration technology for treatment of swimming pool water." Water Science and Technology 77, no. 3 (2017): 748–58. http://dx.doi.org/10.2166/wst.2017.593.

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Abstract The technical performance of a precoat filter was compared with that of a traditional sand filter. Particle concentration and size distribution were measured before and after the filtration of swimming pool water. Both the sand and precoat filters could reduce the particle concentration in the effluent. However, higher particle removal efficiency was generally observed for the precoat filter, especially for particles smaller than 10 μm in diameter. Adding flocculant improved the removal efficiency of the sand filter, resulting in removal efficiencies comparable to those of the precoat

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5

Yang, Qinghua, Yao Xu, Yongle Wu, Weimin Wang, and Zhiguo Lai. "A 3.4–3.6 GHz High-Selectivity Filter Chip Based on Film Bulk Acoustic Resonator Technology." Electronics 12, no. 4 (2023): 1056. http://dx.doi.org/10.3390/electronics12041056.

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The development of mobile 5G technology poses new challenges for high-frequency and high-performance filters. However, current commercial acoustic wave filters mainly focus on 4G LTE, which operates below 3 GHz. It is necessary to accelerate research on high-frequency acoustic wave filters. A high-selectivity film bulk acoustic resonator (FBAR) filter chip for the 3.4–3.6 GHz range was designed and fabricated in this paper. The design procedure includes FBAR parameter fitting, filter schematic analysis, and the generation principle of transmission zeros (TZs). The measured results show that th

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6

Mao, Hongquan. "Advancements in Filter Technology: Evolution and Applications." Highlights in Science, Engineering and Technology 97 (May 28, 2024): 112–16. http://dx.doi.org/10.54097/603hn182.

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This paper explores the historical trajectory and contemporary applications of signal processing filters. From the early days of analog filters to the current digital era, the paper traces their evolution, emphasizing key developments in active RC filters, monolithic integrated op amps, and the transition to switched-capacitor and continuous-time filters. Fundamentals of analog and digital filters are outlined, distinguishing their processing of continuous-time and discrete-time signals. The classification of filters, including low-pass, high-pass, band-pass, and band-stop, is discussed with i

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7

Pa, Pai Shan. "Nano Fabrication Technology of Selective Removal and Optical Assistance." Advanced Materials Research 79-82 (August 2009): 369–72. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.369.

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This study presents a new modus of selective removal technology and an excimer assistance on TFT-LCD above the five generation used to carry out the selective removal of nanostructures layers from optoelectronic flat panel displays’ color filter surface as well as the complete removal from the substrate of the ITO thin-films, RGB layer or resin BM layer. Displays’ color filters are produced using optoelectronic semiconductor fabrication techniques though the low yield during production can still be improved. Through the precise removal process of chemical etching and excimer assistance, the se

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8

Wu, Chi-Fang, Lissette M. Piedra, Lenore E. Matthew, Emily C. Rhodes, and Thanh H. Nguyen. "Water treatment in rural Guatemala: factors associated with the use of biosand water filters." Journal of Water, Sanitation and Hygiene for Development 10, no. 2 (2020): 286–97. http://dx.doi.org/10.2166/washdev.2020.147.

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Abstract Point-of-use water filters are a means to provide clean water vital to the health of people in developing countries. The factors that influence the adoption of this technology include hygiene knowledge, health beliefs related to the use of new technology, and technical issues with using the filter (e.g., water taste and breakage). This study examines how people in Mayan communities in rural Guatemala perceived biosand filters they had received and what factors related to their filter use. Based on the survey and interviewer observations, approximately 53% were regular filter users, 28

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9

Covello, Brian, and Martin Radvany. "Back to the Basics: Inferior Vena Cava Filters." Seminars in Interventional Radiology 39, no. 03 (2022): 226–33. http://dx.doi.org/10.1055/s-0042-1751294.

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AbstractInferior vena cava filters are an important therapeutic option for patients with venous thromboembolism and contraindication to anticoagulation. Indications for filter placement have varied over the previous decades. This article discusses the history of inferior vena cava filter use, with a basic overview of technology and specific devices. Finally, this article reviews emerging filter design and technology. Understanding the basics of inferior vena cava filters is critical to building more robust clinical data for the purpose of improving patient outcomes.

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10

Wavhal, Monika Dattatraya. "Systolic Architecture for High Speed FIR Filter Using VLSI Technology." INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 14, no. 11 (2015): 6211–18. http://dx.doi.org/10.24297/ijct.v14i11.1805.

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The tremendous growth of computer and Internet technology wants the data to be processed athigh speed. Low power consumption, high throughput and optimized hardware are the most important design criteriaâ€™s for VLSI implementation. This project gives an efficient design of high speed FIR filters using systolic architecture. In this paper we have implemented 7th,8th,11th order FIR filter with 8 bit normalized input. To obtain efficient results we have selected B1 design from all the designs of systolic arrays.GF (28) multiplier and XOR adder are used for multiplication and addition in filter.

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11

A. Ibrahim. "On Neutrosophic Transitivity and Absorbent Filters of Basic Logic Algebras." Communications on Applied Nonlinear Analysis 31, no. 5s (2024): 562–70. http://dx.doi.org/10.52783/cana.v31.1091.

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The vital objective of this article is to explore the neutrosophic nature of transitive and absorbent filters in Basic Logic (BL) algebras. We establish the notion of neutrosophic transitive and absorbent filters in BL-algebras with suitable illustrations and examine a few of their properties. Also, we prove that every neutrosophic transitive filter in BL-algebras is a neutrosophic filter. In addition, we confer some necessary and sufficient conditions for a neutrosophic filter to be a transitive filter and an extension property. Further, we obtain (i) Every neutrosophic associative filter is

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12

Farida, Fitri, and Eko Setijadi. "Perancangan Filter Bandpass dengan Teknik Penggabungan Filter Lowpass dan Highpass." Jurnal Sustainable: Jurnal Hasil Penelitian dan Industri Terapan 7, no. 1 (2018): 32–38. http://dx.doi.org/10.31629/sustainable.v7i1.436.

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UWB technology started to become an attraction in the field of research since the Federal Communications Commission (FCC) allowing this communication is used for commercial communications at a frequency (3.1 GHz - 10.6 GHz). UWB has a very wide frequency range so that in practice there is often interference due to signal interference. Therefore in UWB system filter design is required to maintain UWB device. In telecommunications, filter is a transmission device that has the function to pass the desired frequency. In this paper designed bandpass filter which is applied for UWB technology. The d

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13

Li, Xun Chao, and Cong Li. "The Development of Household Membrane Filters for Drinking Water Treatment." Applied Mechanics and Materials 535 (February 2014): 446–50. http://dx.doi.org/10.4028/www.scientific.net/amm.535.446.

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The health risks and potential environment damage from unsafe municipal water have greatly accelerated the development of household water filter around the world. Similarly, the emergence of membrane technology in recently decades has greatly stimulated the rapid development and wide applications of membrane filter. The most widely used types of household membrane filters currently include RO membrane filter, UF membrane filter and MF membrane filter. Such filters are commercially available and of broad prospects in spite of membrane fouling. This review looks back over previous developments a

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14

Ozoliņš, O., V. Bobrovs, and G. Ivanovs. "DWDM Transmission Based on the Thin-Film Filter Technology." Latvian Journal of Physics and Technical Sciences 48, no. 3 (2011): 55–65. http://dx.doi.org/10.2478/v10047-011-0021-x.

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DWDM Transmission Based on the Thin-Film Filter Technology A dense wavelength division multiplexing (DWDM) transmission scheme with two thin-film filters (FWHM bandwidth 100 GHz and 200 GHz) has been realized to evaluate the minimum channel interval needed for a satisfactory bit error ratio. For this purpose, detailed research was conducted into the impact of the filters on the optical signal's de-multiplexing in a DWDM system, in which the measurements of eye diagrams and the optical power spectral densities of a received signal were made. From the results of measurements the minimum channel

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15

Ohnmar, Win. "IIR Filter Design for De Nosing Speech Signal using Matlab." International Journal of Trend in Scientific Research and Development 3, no. 3 (2019): 4–8. https://doi.org/10.31142/ijtsrd21576.

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The design of filter has become the core issues of the signal processing. Generally speaking, filter can be divided into analog filter and digital filter. Today, the development of analog filter has been more mature. However, digital filter has many advantages, such as higher stability, higher precision. With the development of digital technology, using digital technology to realize filter function is widely used. A MATLAB based digital filter design procedure designs the filter and applied to the voice signal. In this project, the recorded speech with simulated noises is processed. The speech

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16

Liew, Hui Fang, Syed Idris Syed Hassan, Mohd Fareq bin Abd Malek, et al. "Design of Compact Composite Microstrip Low Pass Filter Using MEMS Technology." Applied Mechanics and Materials 754-755 (April 2015): 581–90. http://dx.doi.org/10.4028/www.scientific.net/amm.754-755.581.

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This paper presents the design technique of a compact composite microstrip filter operating at ultra high frequency (UHF) band and its fabrication using micro-electro mechanical system MEMS technology. The fringing compensation method is applied into the design of the microstrip line transformation from lumped element. The filter lumped circuits and microstrip line circuit were designed and simulated using Advanced Design Software (ADS) and fabricated on silicon substrates to obtain the best filter characteristic based on S-parameter. The measured and simulated results have achieved a good agr

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17

Wright, Kath, Julie Glanville, and Carol Lefebvre. "VP195 Using The ISSG Search Filter Resource In Health Technology Assessment." International Journal of Technology Assessment in Health Care 33, S1 (2017): 240. http://dx.doi.org/10.1017/s0266462317004226.

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INTRODUCTION:Information specialists and others searching for Health Technology Assessments (HTAs) can use the ISSG Search Filter resource (SFR) to identify filters to incorporate into search strategies. This can save time and effort when designing searches and create more efficient searches that retrieve fewer and possibly more relevant database records (link available here: https://sites.google.com/a/york.ac.uk/issg-search-filters-resource/home).What are search filters? Search filters are collections of search terms designed to retrieve selections of records from bibliographic databases. Som

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18

Liu Chongzheng, 刘崇正, 陈建国 Chen Jianguo, and 周涛 Zhou Tao. "Microwave Photonic Filter Technology." Laser & Optoelectronics Progress 45, no. 10 (2008): 32–38. http://dx.doi.org/10.3788/lop20084510.0032.

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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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20

P. O. Bykov, A. B. Kuandykov, K. Sh. Aryngazin, A. B. Kalieva, and V. V. Larichkin. "ENVIRONMENTAL ASPECTS OF PROCESSING GRANULAR FILTERS FOR PRIMARY ALUMINUM REFINING." Science and Technology of Kazakhstan, no. 1,2024 (March 29, 2024): 150–58. http://dx.doi.org/10.48081/gonv7323.

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This article presents the results of experimental studies on the involvement in the processing of used filters from ash and slag waste used in the refining of primary aluminum as a filler in the production of concrete for building products. The research was carried out within the framework of grant funding from the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan under the competition «Zhas Galym» under the project IRN AR19175493 «Development of technology for refining primary aluminum with filters with an active surface». The recycling of used gr

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Vanpipe Ltd. "Tubular filter with membrane technology for filter/thickener." Filtration & Separation 33, no. 2 (1996): 119–21. http://dx.doi.org/10.1016/s0015-1882(97)84202-4.

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Simpson, Dakotah J., Roberto Gómez-García, and Dimitra Psychogiou. "Mixed-technology quasi-reflectionless planar filters: bandpass, bandstop, and multi-band designs." International Journal of Microwave and Wireless Technologies 11, no. 5-6 (2019): 466–74. http://dx.doi.org/10.1017/s1759078719000230.

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AbstractThe design of mixed-technology quasi-reflectionless planar bandpass filters (BPFs), bandstop filters (BSFs), and multi-band filters is reported. The proposed quasi-reflectionless filter architectures comprise a main filtering section that determines the power transmission response (bandpass, bandstop, or multi-band type) of the overall circuit network and auxiliary sections that absorb the reflected radio-frequency (RF) signal energy. By loading the input and output ports of the main filtering section with auxiliary filtering sections that exhibit a complementary transfer function with

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Hermida, I. Dewa Putu, Deni Permana Kurniadi, and Iqbal Syamsu. "A Narrow Band Pass Filter Using Technology Surface Mount Technology on Radar Frequency Generators." Indonesian Journal of Electrical Engineering and Computer Science 3, no. 1 (2016): 136. http://dx.doi.org/10.11591/ijeecs.v3.i1.pp136-142.

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A BPF using SMT components. A cut-off frequency on a filter under cooling below LPF which works at freq 310 MHz, while the cut-off frequency below a filter under cooling HPF which works at freq 306 MHz, so that the width of the band This filter is a type of narrow bandwidth filter 4 MHz. An 7 poles filter order with the aim to increase the steepness of the filter is generated, using the elliptic filter family or causer. Stop band width (Fs) to filter under cooling below about 20% in the frequency range 372 MHz, with stop band depth (As) of about 55 dB, while the stop band width (Fs) to filter

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Wen, Hui, and Shu Ming Li. "DSP-Based FIR Filter Design and Circular Buffer Implementation." Advanced Materials Research 403-408 (November 2011): 1755–58. http://dx.doi.org/10.4028/www.scientific.net/amr.403-408.1755.

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The digital filter technology includes two aspects, which are the filter design process and filter realization. The article expounded the basic structure of FIR filter, with examples on the use Matlab to determine the FIR filter coefficient, analysis of the cycle of the buffer zone algorithm Principle, based on the algorithm, combination of filters designed to achieve the input of mixed-signal FIR digital filter. In the end, the filter is given before and after the input and output signal waveform simulation.

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Govorova, Zhanna, Ekaterina Muraveva, Yulia Isachkina, and Vadim Govorov. "Technology of surface runoff purification." E3S Web of Conferences 97 (2019): 06019. http://dx.doi.org/10.1051/e3sconf/20199706019.

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Surface runoff from urban area is a potential source of pollution of water bodies. Characteristics of rainfall runoff in some cities of Russia and foreign countries are given in the article. Traditional wastewater treatment facilities include the mechanical removal of large items, debris and leaves; sand removal; water clarification in accumulative clarifying tanks; chemical dosing, contact filtration and deep purification in sorption filters. Four technological schemes were analyzed. Conceptual difference of the schemes is using a new construction of accumulative clarifying tanks and differen

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MURAKAMI, TAKU. "Filter-Based Pathogen Enrichment Technology for Detection of Multiple Viable Foodborne Pathogens in 1 Day." Journal of Food Protection 75, no. 9 (2012): 1603–10. http://dx.doi.org/10.4315/0362-028x.jfp-12-039.

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Conventional foodborne pathogen assays currently used in the food industry often require long culture enrichments to increase pathogen levels so they can be detected. Even using sensitive real-time PCR assays, culture enrichment at least overnight is necessary especially for detection of pathogens with slow growth rates such as Listeria monocytogenes. To eliminate this cumbersome enrichment step and detect minute amounts of pathogens within 1 day, filter-based pathogen enrichment technology was developed utilizing a unique combination of glass fiber depth filter and porous filter aid materials

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Chen, Pu, Guangxi Li, and Zhiyuan Zhu. "Development and Application of SAW Filter." Micromachines 13, no. 5 (2022): 656. http://dx.doi.org/10.3390/mi13050656.

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With the in-depth advancement of the fifth generation (5G) mobile communication technology, the technical requirements for filters are also constantly improving. Surface acoustic wave (SAW) filters are widely used in home TV, mobile communications, radio frequency filters and radar due to their simple structure, few mask layers, easy miniaturization, and low cost. Through the continuous improvement of communication technology, SAW has developed into various high-performance acoustic filters from bulk SAW with the support of some new architectures, new materials and advanced modeling techniques

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Brügger, A., K. Voßenkaul, T. Melin, et al. "Reuse of filter backwash water by implementing ultrafiltration technology." Water Supply 1, no. 5-6 (2001): 207–14. http://dx.doi.org/10.2166/ws.2001.0116.

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Membrane filtration allows safe retention of microorganisms when treating filter backwash water from conventional drinking water filters. The permeate of the membrane plant can thus be reused to produce drinking water. The benefits are a higher yield of the drinking water treatment plant and a minimised wastewater production. This paper discusses the results of a pilot study, cost data and full-scale operation experiences concerning the application of ultrafiltration to treat filter backwash water. The effectiveness of ultrafiltration was assessed with regard to flux, cost and permeate quality

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Kercher, Kent, and Ronald F. Sing. "Overview of Current Inferior Vena Cava Filters." American Surgeon 69, no. 8 (2003): 643–48. http://dx.doi.org/10.1177/000313480306900802.

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Inferior vena cava (IVC) filter technology has expanded dramatically over the past decade. Improvements in catheter and filter technology have allowed for the safe and rapid insertion of IVC filters from multiple venous access sites, using increasingly lower-profile percutaneous delivery systems. While the currently available filters have slightly different designs and insertion techniques, all function in a similar fashion to prevent venous thromboembolic propagation through the inferior vena cava. This article describes the construction and deployment mechanisms of the various filters that a

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A, Srinivaas, and Vishnu R. "Performance Analysis and Testing of Aftermarket Filters." International Journal of Engineering & Technology 7, no. 3.8 (2018): 42. http://dx.doi.org/10.14419/ijet.v7i3.8.15216.

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Aftermarket segment is one of the promising and growing section in automobile industry. The popularity of this section is due to the low cost and high replacement rate. Best filters among many will survive in the market. Different Filter manufacturers develop filters for same purpose but varies in their construction. There are a wide variety of aftermarket performance filters for the same type of OEMs. They vary in their brand name, filter area, filter medium, price, service life and method of install. The presence of increased number of aftermarket performance filters has prompted automotive

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Lü, Shaobo, Ruisheng Wang, Jing Ma, et al. "Design and manufacture of super-multilayer optical filters based on PARMS technology." Advanced Optical Technologies 7, no. 1-2 (2018): 49–55. http://dx.doi.org/10.1515/aot-2017-0075.

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AbstractThree multilayer interference optical filters, including a UV band-pass, a VIS dual-band-pass and a notch filter, were designed by using Ta2O5, Nb2O5, Al2O3and SiO2as high- and low-index materials. During the design of the coating process, a hybrid optical monitoring and RATE-controlled layer thickness control scheme was adopted. The coating process was simulated by using the optical monitoring system (OMS) Simulator, and the simulation result indicated that the layer thickness can be controlled within an error of less than ±0.1%. The three filters were manufactured on a plasma-assiste

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Molodkina ina, L. M., Yu A. Korostelyova, A. N. Chusov, et al. "Filter Material Diamix Aqua as a Media for a Contact Filter in Water Treatment Technology." Ecology and Industry of Russia 26, no. 4 (2022): 44–49. http://dx.doi.org/10.18412/1816-0395-2022-4-44-49.

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The study of the filter material Diamix Aqua (Diamix Aqua) by LLC "Diamix" (Ulyanovsk) was carried out. The modes of preliminary washing of the filtering material Diamix Aqua have been worked out; the efficiency of the process of purification of model systems and natural waters from impurities that determine their color and turbidity has been determined. The Diamix Aqua performance characteristics were evaluated vs. quartz sand for the purification of surface natural low turbid colored waters with increased oxidizability on contact filters at water treatment plants using aluminum sulfate as a

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Yüksel, E., Ö. Akgiray, A. M. Saatçi, H. Z. Sarikaya, and I. Koyuncu. "Effect of ozone injection location on filter performance in direct filtration." Water Science and Technology 46, no. 9 (2002): 171–77. http://dx.doi.org/10.2166/wst.2002.0232.

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Two identical pilot scale sand filters were operated in parallel to study the effects of preozonation in direct filtration. No coagulants were used. The influent of one filter was ozonated, whereas the influent to the second filter was aerated. Significantly improved reduction in turbidity, particle count, and iron was observed with the filter receiving preozonated water. The head loss development rate was increased as a result of using ozone. In a second set of experiments, the effects of ozone injection point on filter performance were investigated. Two identical filters both receiving preoz

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Wang, Hongyu, Jiajie He, and Kai Yang. "Partial nitrification of non-ammonium-rich wastewater within biofilm filters under ambient temperature." Water Science and Technology 62, no. 7 (2010): 1518–25. http://dx.doi.org/10.2166/wst.2010.424.

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This study evaluated the partial nitrification performances of two biofilm filters over a synthetic non-ammonium-rich wastewater at a 20°C room temperature under both limited DO (∼2.0 mg/L) and unlimited DO (∼4.0 mg/L) conditions. The two filters were each of 80 cm long and used different biofilm carriers: activated carbon and ceramic granule. Results showed that partial nitrification was accomplished for both filters under the limited DO condition. However, the effluent NO2-N was higher in the ceramic granule filter than in the activated carbon filter, and was less susceptible to the influent

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Breda, I. L., L. Ramsay, D. A. Søborg, R. Dimitrova, and P. Roslev. "Manganese removal processes at 10 groundwater fed full-scale drinking water treatment plants." Water Quality Research Journal 54, no. 4 (2019): 326–37. http://dx.doi.org/10.2166/wqrj.2019.006.

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Abstract Manganese (Mn) removal in drinking water filters is facilitated by biological and physico-chemical processes. However, there is limited information about the dominant processes for Mn removal in full-scale matured filters with different filter materials over filter depth. Water and filter material samples were collected from 10 full-scale drinking water treatment plants (DWTPs) to characterise the Mn removal processes, to evaluate the potential use of enhancers and to gain further insight on operational conditions of matured filters for the efficient Mn removal. The first-order Mn rem

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B., A. Ankidawa, and A. Tope A. "Design of Slow Sand Filter Technology for Rural Water Treatment in Girei, Adamawa State, North Eastern Nigeria." Asian Journal of Environment & Ecology 3, no. 3 (2017): 1–7. https://doi.org/10.9734/AJEE/2017/34395.

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Treatment of water has a great influence on the use of water for domestic use both in rural and urban areas. Slow sand filtration involves the use of beds of sand for the filtration of water. The reason for designing slow sand filter for rural water treatment is to make treatment of water easy and qualitative. This research involves the use of three tanks, filter beds, filter media and filtrate tanks. Raw water is filtered by the layers of different sand particles, and conveyed by pipe after filtration to the filter media that has diatomite as the sieving agent which filters the water before b

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Vanderzwaag, Jason C., James W. Atwater, Karen H. Bartlett, and Derek Baker. "Field Evaluation of Long-Term Performance and Use of Biosand Filters in Posoltega, Nicaragua." Water Quality Research Journal 44, no. 2 (2009): 111–21. http://dx.doi.org/10.2166/wqrj.2009.012.

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Abstract An evaluation was conducted in 2007 on biosand filters that were installed in Posoltega, Nicaragua in 1999 and 2004.The objectives were to characterize the condition and use of filters eight and three years after installation, determine filter performance of those filters still in use, and identify determinants of successful long-term use and performance. Methods consisted of household identification, user questionnaires, and water quality testing. Of the 234 filters installed, only 24 were found to still be in use. Average log reductions were 1.73 (98%) for total coliforms, 1.36 (96%

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Długosz, Rafał, Andrzej Rydlewski, and Tomasz Talaśka. "Novel, low power, nonlinear dilatation and erosion filters realized in the CMOS technology." Facta universitatis - series: Electronics and Energetics 28, no. 2 (2015): 237–49. http://dx.doi.org/10.2298/fuee1502237d.

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In this paper we propose novel, binary-tree, asynchronous, nonlinear filters suitable for signal processing realized at the transistor level. Two versions of the filter have been proposed, namely the dilatation (Max) and the erosion (Min) one. In the proposed circuits an input signal (current) is sampled in a delay line, controlled by a multiphase clock. In the subsequent stage particular samples are converted to 1-bit digital signals with delays proportional to the values of these samples. In the last step the delays are compared in digital binary-tree structure in order to find either the Mi

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Ma, Yue, Qifei Du, Wei Zhang, Cheng Liu, and Hao Zhang. "A Miniaturized Bandpass Filter with Wideband and High Stopband Rejection Using LTCC Technology." Electronics 13, no. 1 (2023): 166. http://dx.doi.org/10.3390/electronics13010166.

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This paper designs an L-band wide stopband bandpass filter by applying low-temperature cofired ceramic (LTCC) technology to the global positioning system (GPS) frequency band. Taking the Chebyshev filter as a prototype, an equivalent collector element (capacitive and inductor) structure is adopted to fully use the three-dimensional package structure of LTCC to reduce the filter size. The filter is integrated into an eight-layer LTCC dielectric, and the series–parallel connection of the collector elements in the resonance unit is utilized to produce out-of-band transmission zeros, while the inp

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Chen, Xueying. "Simulation and discussion of typical radio frequency filters." Journal of Physics: Conference Series 2634, no. 1 (2023): 012014. http://dx.doi.org/10.1088/1742-6596/2634/1/012014.

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Abstract The demand for filters is increasing as the frequency bands for 5G expand. RF filters become the segment with the largest market share of RF front-end chips. More crowded frequency bands, as well as thinner and lighter communication equipment, necessitate higher filter performance. In this paper, several technologies for the implementation of Radio Frequency filter are presented. Essentially three types are considered: (i) Lumped Element (LC) Filter and Integrated Passive Devices (IPD) technology; (ii) Acoustic Wave Filter; and (iii) a composite filter design that combines acoustic an

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He, Hong, Shuai Bao, Hang Li, Da Jian Zhang, and Ming Feng Hou. "The Filter Technology of Switching Power Supply." Advanced Materials Research 204-210 (February 2011): 482–85. http://dx.doi.org/10.4028/www.scientific.net/amr.204-210.482.

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The basic principle of switching power supply EMI filter was described. The circuit principle of passive EMI filter and several topology circuit of active EMI filter were introduced. Active EMI filter with feedforward, active EMI filter without current detection sensors installed and active EMI filter for three-phase inverter motor were researched. The problem that following the frequency rising of switching power supply, the EMI noise pollution was becoming more and more serious than before was solved. These growing pollutions had resulted in widespread application of EMI filter technology an

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Li, Jiajie. "Design and hardware implementation of FIR digital filter." Applied and Computational Engineering 72, no. 1 (2024): 288–93. http://dx.doi.org/10.54254/2755-2721/72/20241040.

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This article is about the hardware application of one of the basic filters (FIR filter) often used in digital signal processing. First, it introduces the development process of FIR digital filter and the development of FIR digital filter today, and then introduces FIR digital filter. The part combined with hardware, including the research on the hardware implementation technology of the programmable digital filter based on the emictor, the combination with the memistor and the combination with the programmable logic device FPGA is the second most typical research on the combination of digital

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Alberti, M., L. Meixner, A. Rückerl, M. Eder, H. E. Endres, and K. Bock. "“Sensor-filter”—Intelligent micro filter system in foil technology." Sensors and Actuators A: Physical 202 (November 2013): 197–203. http://dx.doi.org/10.1016/j.sna.2013.01.015.

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Alberti, M., L. Meixner, A. Rückerl, M. Eder, H. E. Endres, and K. Bock. "“Sensor-Filter”–Intelligent Micro Filter System in Foil Technology." Procedia Engineering 47 (2012): 212–15. http://dx.doi.org/10.1016/j.proeng.2012.09.121.

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Uhlig, Peter, Juergen Kassner, Carsten Guenner, and Elke Noack. "Microwave Filter Design Optimized for Ceramic Multilayer Technique." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2016, CICMT (2016): 000199–202. http://dx.doi.org/10.4071/2016cicmt-tha23.

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Abstract Low Temperature Co-fired Ceramic (LTCC) is a proven packaging technology for microwave and millimetre-wave applications. Advanced low-loss material systems and improved manufacturing technology facilitate economic and highly reliable packaging solutions for automotive, telecom, medical and security applications. One of the virtues of LTCC is the option to integrate all kinds of components into the multilayer. Embedded passives include resistors, capacitors and inductors. Moving matching networks and filters into inner layers is further increasing density of integration. Microwave filt

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Zhang, Zhi Hong, Bao Feng Zhang, and Guang Quan Li. "Filter Technology in the Switching Power Supply." Advanced Materials Research 787 (September 2013): 726–30. http://dx.doi.org/10.4028/www.scientific.net/amr.787.726.

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With the increase of switching frequency of power switch, EMI noise pollution becomes more and more serious. In order to solve this problem, in this paper, the switch power supply filter and passive EMI filter, active EMI filter is studied. It mainly research active EMI filter with feed forward , non-inductive current detection device of active EMI filter and active EMI filter for three-phase inverter motor. To solve this problem which is that EMI noise pollution has become more serious along with the increase of switching frequency switch power supply, the increasingly serious pollution make

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Beg, Parveen. "Tunable First-Order Resistorless All-Pass Filter with Low Output Impedance." Scientific World Journal 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/219453.

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This paper presents a voltage mode cascadable single active element tunable first-order all-pass filter with a single passive component. The active element used to realise the filter is a new building block termed as differential difference dual-X current conveyor with a buffered output (DD-DXCCII). The filter is thus realized with the help of a DD-DXCCII, a capacitor, and a MOS transistor. By exploiting the low output impedance, a higher order filter is also realized. Nonideal and parasitic study is also carried out on the realised filters. The proposed DD-DXCCII filters are simulated using T

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Sharroush, Sherif, and Yasser Abdalla. "A Real-Time Electronically Tunable All-MOS Universal Biquadratic Voltage-Mode Filter." Jordan Journal of Electrical Engineering 9, no. 2 (2023): 242. http://dx.doi.org/10.5455/jjee.204-1671142029.

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— In this paper, an electronically tunable universal biquadratic voltage-mode filter that is based only on MOS transistors is proposed. Configuration of the proposed filter is simple and there is no need to use component matching. Since the proposed filter contains only MOS transistors, it is very suitable for implementation in system-on-chip (SoC) applications. The cutoff frequency of the lowpass (LP) and highpass (HP) filters as well as the center frequency and the bandwidth of the bandpass (BP) and bandstop (BS) filters can be controlled either in a continuous range or in a discrete manner

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Chinda, Francis E., Socheatra Seoung, Sovuthy Cheab, Muhammad S. Yahya, and Huzein F. Hawari. "Design of Compact Parallel-Connected Chained Function Filters." Journal of Electromagnetic Engineering and Science 23, no. 3 (2023): 283–93. http://dx.doi.org/10.26866/jees.2023.3.r.169.

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The design of compact parallel-connected chained function filters is presented in this paper. The proposed filters will offer reduced sensitivity to manufacturing tolerance within the specified bandwidth in comparison to conventional Chebyshev filters for C-band applications. A new filtering function according to a chained configuration is derived for fourth-order filters, and the synthesis procedures are presented. To demonstrate the feasibility of this approach, the circuit simulation based on parallel-connected topology is performed in an advanced design system, while the design and simulat

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Latvala, Arto. "Multilayer Intermittent Sand Filter." Water Science and Technology 28, no. 10 (1993): 125–32. http://dx.doi.org/10.2166/wst.1993.0218.

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For developing intermittent sand filters more compact laboratory tests were arranged at Suomenoja Wastewater Research Station in Espoo, Finland. The purpose of these experiments was to develop this method to become multilayer. Multilayer means here two or three influent pipe systems in the same filter instead of one. These influents can be used simultaneously. This means that it is possible to increase the BOD-loading of the filter. However effluent quality depends on the BOD-loading of the filter. If BOD-loading is increased, then BOD of the effluent also increases in respect to BOD-load. How

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