Relevant bibliographies by topics / Filter

Academic literature on the topic 'Filter'

Author: Grafiati
Published: 4 June 2021
Last updated: 20 April 2024

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Journal articles on the topic "Filter"

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Makaravičiūtė, Lygita, and Eglė Marčiulaitienė. "CONDUCTIVITY TESTING AND EVALUATION / PAVIRŠINIŲ NUOTEKŲ FILTRO HIDRAULINIO LAIDUMO TYRIMAI IR VERTINIMAS." Mokslas – Lietuvos ateitis 7, no. 4 (September 29, 2015): 436–42. http://dx.doi.org/10.3846/mla.2015.810.

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Surface wastewater is consideredas effluents, which are formed on the surface of urbanized areas. Stormwater treatment is performed out using a variety of filters: sand, grass. Wastewater penetration into the deeper layers is called hydraulic conductivity. After evaluation of the hydraulic conductivity, it is possible to determine the ability of the investigated fillers to entrap the stormwater flow. The hydraulic conductivity tests can indicate which fillers of stormwater filters may influence the more effective stormwater cleaning. Four stormwater filters were tested: crushed autoclaved aerated concrete filter; crushed autoclaved aerated concrete with Meadow grass (Poa pratensis) layer; silica sand filter with Meadow grass (Poa pratensis) layer; silica sand filter. Under in-situ conditions hydraulic conductivity in filters is investigated using Constant-head method. Mathematical modeling program Hydrus-1D presentsthe changes of hydraulic conductivity in each filler layer of the filter. Assessed hydraulic conductivity in filters under in-situ conditions hasn‘t changed only in crushed autoclaved aerated concrete filter (30 000 mm/d). The smallest hydraulic conductivity in filters under in-situ conditions was estimated in silica sand filter with Meadow grass (Poa pratensis) layer, here it was equal to 209.3 mm/d.With mathematical modeling program Hydrus-1D it was found that the hydraulic conductivity in each filter decreases, depending on the depth of filler in the filter. Paviršinėmis nuotekomis laikomos tokios, kurios susidaro ant urbanizuotos teritorijos paviršiaus. Paviršinių nuotekų valymas atliekamas taikant įvairius filtrus – smėlio, augalinius. Nuotekų skverbimasis į gilesnius sluoksnius vadinamas hidrauliniu laidumu. Įvertinus hidraulinį laidumą galima nustatyti tiriamų filtro užpildų gebėjimą sulaikyti atitekėjusių paviršinių nuotekų srautą filtro užpilduose. Atlikus hidraulinio laidumo tyrimus, galima nustatyti, kurie paviršinių nuotekų filtro užpildai gali lemti efektyvesnį paviršinių nuotekų išvalymą. Tiriami keturi paviršinių nuotekų filtrai: smulkinto autoklavinio akytojo betono filtras; smulkinto autoklavinio akytojo betono ir pievinės miglės dangos filtras; kvarcinio smėlio filtras su pievinės miglės danga; kvarcinio smėlio filtras. Natūrinėmis sąlygomis hidraulinio laidumo tyrimas atliekamas, taikant Constant-Head metodą. Matematinio modeliavimo programa Hydrus-1D pateikiama, kaip kinta hidraulinis laidumas kiekviename filtro užpildo sluoksnyje. Nustatytas hidraulinis laidumas filtruose natūrinėmis sąlygomis nekito smulkinto autoklavinio akytojo betono filtre (30 000 mm/d). Mažiausias hidraulinis laidumas natūrinėmis sąlygomis nustatytas kvarcinio smėlio filtre su pievinės miglės (Poa pratensis) augalinės dangos sluoksniu, čia jis nustatytas 209,3 mm/d. Matematinio modeliavimo programa Hydrus-1D nustatyta, kad hidraulinis laidumas filtruose mažėja priklausomai nuo filtro užpildo gylio.
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Tamura, Yoshiro, Ryo Sekiyama, Shu Sasaki, Koji Asami, and Haruo Kobayashi. "RC Polyphase Filter as Complex Analog Hilbert Filter." Applied Mechanics and Materials 888 (February 2019): 29–36. http://dx.doi.org/10.4028/www.scientific.net/amm.888.29.

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This paper presents that the RC polyphase filer has characteristics as a complex analog Hilbert filter. Phase characteristics of the RC polyphase filter have the same as the Hilbert filter. Also its gain characteristics can be approximated as the Hilbert filter; as its order becomes higher, its gain characteristics become closer to the Hilbert filter. We have proved these for 1st to 4th RC polyphase filters, as well as in general n-th order case, and also confirmed with numerical simulations.
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Boyarskaya, N. P., V. P. Dovgun, D. E. Egorov, V. V. Novikov, and D. A. Shandrigin. "Minimization of power losses in passive power filters." Power engineering: research, equipment, technology 23, no. 6 (March 30, 2022): 42–52. http://dx.doi.org/10.30724/1998-9903-2021-23-6-42-52.

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THE PURPOSE. Broadband passive filters (BBF) are an effective measure to mitigate harmonic resonance in power systems with nonlinear harmonic producing loads. The disadvantage of simple second-order broadband filters are pure selectivity and excessive fundamental frequency losses. This is especially evident in devices designed for low-order harmonics mitigation. This paper presents new broadband filter configurations with superior performances and low fundamental frequency losses.METHODS. A general method of broadband passive filter design is considered. The filter has the form of single-loaded ladder LC-two-port. Conditions of minimal fundamental frequency loss of the filer are determined.RESULTS. This paper presents new broadband filter configurations with superior damping performances and low fundamental frequency losses. Different broadband filter configurations are compared. The results show that 3-5 order broadband ladder filters have better filtering performance and lower power loss than traditional C-type filters.CONCLUSION. The proposed broadband filters can be used for industrial power systems with powerful nonlinear loads. This will normalize the power quality and at the same time improve the energy efficiency of compensating devices.
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Li, Hai Xia, Zhi Jun Sun, Li Jun Zhao, and Zhan Xu Tie. "Filtration and Pulse Cleaning System for Particle Removal from Gas." Applied Mechanics and Materials 42 (November 2010): 188–91. http://dx.doi.org/10.4028/www.scientific.net/amm.42.188.

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The application of rigid ceramic filter for gas filtration on an industrial scale has shown unstable operation over periods of days. The behavior of the ceramic filtration in further application can be predict by measuring properties of a variety of dust and filtration operation condition. The aim of the experimental investigation is to analysis the pressure distribution inside and outside the ceramic filter along the filter length, and to analyze the pressure drop across the filter along the filter length. Ceramic filter filtration system composes multi-pipe filters for gas clean up is introduced. The operation parameters can be measured by this test system, such as the pressure in the filter cavity and outside the filter surface, velocity outside the filter, gas temperature and humidity, flow rate, dust particle size concentration before gad entering the filter tank and after the gas leaving the filer tank, the pulse cleaning pressure.
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Sytnikov, T. V. "INCREASING Q-FACTOR OF THE DIGITAL SENSOR SIGNALS PROCESSING PATH IN AUTONOMOUS MOBILE ROBOTIC PLATFORMS WITH LIMITED COMPUTING RESOURCES." ELECTRICAL AND COMPUTER SYSTEMS, no. 39(115) (2024): 26–34. http://dx.doi.org/10.15276/eltecs.39.115.2024.3.

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Abstract. The paper is considered the problem of constructing autonomous mobile robotic platform with the possibility of rearranging their characteristics depending on the operating conditions. A new approach is proposed for calculating the parameters of a new connection with a series connection of low-order components of the same type. The resulting ratio allows you to accurately calculate the frequencies of the n-th connection of the same type components. Such a connection allows increasing the quality factor characteristic of the amplitude frequency characteristic and reducing the bandwidth by 3 times with eight connected filters of the same type. Bandpass filters and notch Butterworth filters are considered. Behavior of the AFC for serial connection is described. Key words: amplitude frequency characteristic, phase frequency characteristic, Industry 4.0-6.0, digital filter, bandpass filter, notch filter, quality factor characteristics, frequency dependent component, notch filter based on bandpass filer, serial connection.
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Even, Tomer, Guy Even, and Adam Morrison. "Prefix filter." Proceedings of the VLDB Endowment 15, no. 7 (March 2022): 1311–23. http://dx.doi.org/10.14778/3523210.3523211.

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Many applications of approximate membership query data structures, or filters , require only an incremental filter that supports insertions but not deletions. However, the design space of incremental filters is missing a "sweet spot" filter that combines space efficiency, fast queries, and fast insertions. Incremental filters, such as the Bloom and blocked Bloom filter, are not space efficient. Dynamic filters (i.e., supporting deletions), such as the cuckoo or vector quotient filter, are space efficient but do not exhibit consistently fast insertions and queries. In this paper, we propose the prefix filter , an incremental filter that addresses the above challenge: (1) its space (in bits) is similar to state-of-the-art dynamic filters; (2) query throughput is high and is comparable to that of the cuckoo filter; and (3) insert throughput is high with overall build times faster than those of the vector quotient filter and cuckoo filter by 1.39X--1.46X and 3.2X--3.5X, respectively. We present a rigorous analysis of the prefix filter that holds also for practical set sizes (i.e., n = 2 25 ). The analysis deals with the probability of failure, false positive rate, and probability that an operation requires accessing more than a single cache line.
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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-afilter); (3) a fuzzy filter of a pseudo-BCIalgebra is fuzzya-filter if and only if it is both a fuzzyp-filter and a fuzzyq-filter.
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Sakata, Soichiro, Hideto Takahashi, Katsumi Sato, and Atsushi Takahashi. "Ceramic Chemical Filter for Removal of Organic Contaminants." Journal of the IEST 46, no. 1 (September 14, 2003): 59–65. http://dx.doi.org/10.17764/jiet.46.1.p166m0528hhj0533.

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A recently developed nonflammable ceramic chemical filter1 provides an alternative to conventional charcoal filters for removing organic airborne molecular contamination2 in cleanroom applications. The ceramic chemical filter is applicable in mini-environments and clean enclosures to handle manufacturing processes of less than 0.1 μm design and 300 mm wafer.
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Aviva, Darma, Abdul Halim, Baso Cante, and Abdul Muis. "Pengaruh Penggunaan Filter Non Original Terhadap Kerusakan Bucket Control Valve Excavator 320D." MEDIA PERSPEKTIF : Journal of Technology 13, no. 1 (September 30, 2021): 18. http://dx.doi.org/10.46964/jtmp.v13i1.1349.

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The hydraulic oil filter is one of the components contained in the hydraulic system which functions to filter the impurities contained in the oil so that it does not circulate into the system. The purpose of this study was to determine the performance of the original and non-original filters in relation to the damage that occurred to the control valve. The results indicated that the damage to the spool valve was caused by hydraulic oil contaminated with water, resulting in corrosion on its surface. Visual inspection of the hydraulic oil filter reveals particles found in the filer element.
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Chen, Yi Qing, Jian Wei Wu, Wang Feng Cai, and Ying Zhong. "Study on Treatment of Odor Containing H2S and NH3 by Industrial Scale Bio-Trickling Filters." Advanced Materials Research 777 (September 2013): 330–33. http://dx.doi.org/10.4028/www.scientific.net/amr.777.330.

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The treatment of H2S and NH3 odor produced in sewage disposal process was carried out in industrial scale bio-trickling filters filled with different kinds of filler. The processing capacity per unit volume and the processing capacity per unit volume filler on odor removal performance for different bio-trickling filter were investigated. The results demonstrate that there are remarkable differences in deodorization performance between different kinds of bio-trickling filters.
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Dissertations / Theses on the topic "Filter"

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Basti, Ahmed. "Développement de méthodes de synthèse pour la conception de filtres hyperfréquences compacts et optimisés en pertes." Thesis, Limoges, 2014. http://www.theses.fr/2014LIMO0023/document.

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Pour les systèmes de communication par satellite, des filtres avec de très bonnes performances électriques sont indispensables afin de rejeter les signaux indésirables dans de nombreuses parties de la chaîne de communication. Les technologies fort-Q peuvent répondre à cette exigence mais elles conduisent souvent à des dispositifs encombrants. D'autre part, les technologies compactes faible-Q souffrent généralement d'une dégradation des performances électriques en termes de pertes d'insertion, de sélectivité et de platitude. Pour répondre à une demande croissante concernant la réduction de la taille, il est essentiel de développer des filtres hyperfréquences compacts avec des performances électriques améliorées.Pour le filtre de réception, le défi est de concevoir un filtre passe-bande compact avec une réponse plate dans la bande passante et une forte réjection hors bande. Les pertes d'insertion ne sont pas cruciales et peuvent être compensées par un amplificateur en laissant ainsi un espace pour la conception de filtre à pertes. Un tel filtre accepte des pertes supplémentaires, qui peuvent être distribués dans le réseau afin de fournir une transmission plate dans la bande passante et une forte sélectivité hors bande.Dans le cadre de cette thèse, des nouvelles méthodes de synthèse de dispositifs de filtrage ont été étudiées et développées dans le but d’améliorer les performances tout en conservant un encombrement réduit. Ces méthodes ont été validées pour la conception de filtres de récepteur dans la charge utile de satellites de télécommunication dans le cadre d’une collaboration entre le laboratoire Xlim, le Centre National d’Etudes Spatiales et Thales Alenia Space
For satellite communication systems, high performance filters are needed in order to reject unwanted signals in many parts of the communication chain. High quality factor (Q) technologies can meet this requirement, but they often lead to bulky devices. On the other hand, compact technologies are generally low Q and suffer from a degradation of electrical performances in terms of insertion loss, selectivity and flatness. To meet a growing demand concerning size reduction, it is essential to develop compact microwave filters with improved electrical performances.For a receive filter, the challenge is to design a compact bandpass filter with a flat response in the passband and a sharp transition in the passband edges. The insertion loss is not crucial and it can be compensated by the amplifier, leaving a room to the design of a lossy filter. Such a filter accepts additional losses, which can be distributed in the network in order to provide a flat transmission in the passband and a sharp selectivity.In this thesis, new synthesis methods for filtering devices have been studied and developed to improve performances while maintaining a small footprint. These methods have been validated for the design of filters for a receiver in payload satellites as part of collaboration between the Xlim laboratory, the France National Space Centre and Thales Alenia Space
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Shadrin, Aleksandr. "Analogové pole pro realizaci programovatelného filtru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-221026.

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The state-variable analog filter topologies are described. Using the transfer function theory and operational configurations suitable for integration and derivation, a new universal filter topology are proposed. The circuit has been implemented in CMOS technology by using six operational amplifiers, eight analog switches and five programming resistor array. Tunable corner frequencies, quality factors and gain are realized. Using the serial peripheral interface or digital memory can be realized this real-time digitally programmable first- and second-order analog filter with the tunable parameters.
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Haidar, Ahmad. "Synthèse de filtres hyperfréquences prenant en compte le comportement dispersif des couplages." Thesis, Limoges, 2018. http://www.theses.fr/2018LIMO0105/document.

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Ces travaux de thèse concernent la mise au point d’une méthodologie de conception de filtres passe-bandes à couplages dispersifs permettant d’optimiser la sélectivité de ces filtres en générant et en contrôlant la position de zéros de transmission supplémentaires. Un état de l’art sur les différentes approches proposées dans la littérature pour la synthèse de filtres hyperfréquences à couplage dispersif est d’abord proposé. Cette analyse est illustrée par plusieurs exemples concrets, et une structure en particulier, comportant un couplage par plot capacitif, constitue le point de départ des travaux. De nouveaux éléments de couplage dispersifs ont été ensuite proposés, capables de générer aussi bien des couplages positifs que négatifs, permettant ainsi de positionner les zéros de transmission dans la bande stoppée supérieure ou inférieure. Ces éléments ont alors été intégrés dans des structures de filtrage plus complexes pour réaliser par exemple des structures en ligne possédant plusieurs zéros de transmission hors bande ou des filtres multibandes à la sélectivité renforcée. Plusieurs des dispositifs conçus ont été fabriqués et mesurés. Les résultats expérimentaux sont en bon accord avec les simulations validant ainsi l’approche proposée
This thesis report deals with the development of a methodology for the design of bandpass filters including dispersive coupling to optimize the selectivity of these filters by generating and controlling the position of additional transmission zeros. A state of the art on the different approaches proposed in the literature for the synthesis of microwave filters with dispersive coupling is first proposed. This analysis is illustrated by several concrete examples, and a structure in particular, comprising a coupling capacitive post, is the starting point of the work. New dispersive coupling elements were then proposed, capable of generating both positive and negative couplings, thus enabling the transmission zeros to be positioned in the upper or lower stopped band. These elements have then been integrated in more complex filtering structures to achieve, for example, on-line structures having several out-of-band transmission zeros or multiband filters with enhanced selectivity. Many of the devices designed have been manufactured and measured. The experimental results are in good agreement with the simulations validating the proposed approach
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Zlámal, Jiří. "Návrh elektronicky laditelných kmitočtových filtrů v technologii CMOS." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-221016.

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This master thesis deals with the problematics of CT filters and focuses on Gm – C filter. Three linearisation techniques are listed and compared in terms of linear input range, distortion and retuning. In the practical part – second - order low – pass filter is designed and its tuning capabilities are examined.
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Demirsoy, Süleyman Sırrı. "Complexity reduction in digital filters and filter banks." Thesis, University of Westminster, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433680.

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Vrba, Adam. "Analýza a realizace kmitočtového filtru přeladitelného změnou parametru aktivního prvku." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218675.

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This work analyzes tuning capabilities of different fully integrated active filter topologies. Work only deals with continuous time active filters. Topologies described in this work differ in type of active element and in method of frequency tuning. Techniques of tunning are proved on second order low pass filter. Filter topologies are compared from tunning capabilities and from point of total harmonic distortion. The main building block of all filters is integrator.
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Eshghi, Mohammad. "Highly parallel transversal adaptive filter." Ohio : Ohio University, 1988. http://www.ohiolink.edu/etd/view.cgi?ohiou1182785469.

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Rosenbaum, Linnea. "On low-complexity frequency selective digital filters and filter banks." Doctoral thesis, Linköpings universitet, Elektroniksystem, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8930.

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En filterbank består av flera filter som arbetar tillsammans för att dela upp en signal i olika frekvensband. De kan också användas för att slå ihop signaler separerade i frekvensplanet till en enda. Sedan tidigt 70-tal har man lärt sig att designa förlustfria filterbankar som alltså inte introducerar några som helst fel i systemet. Sådana filterbankar kallas PR-filterbankar, där PR står för 'perfekt rekonstruktion'. Exempel på applikationer där filterbankar används är bildkodning, audiokodning, kommunikationssystem och omvandling av analoga signaler till digitala (A/D-omvandling). Under de senaste åren har det framkommit att genom att lätta på kraven gällande perfekt rekonstruktion, går det att markant minska den erforderliga aritmetiska komplexiteten. Eftersom de flesta system i sig inte är förlustfria, kan man utan att egentligen påverka den totala prestandan tillåta små fel i filterbanken, så l¨ange dessa fel är försumbara i jämförelse med andra felkällor som t.ex. kvantisering och avrundning. Avhandlingen behandlar digitala filter och likformiga icke-PR-filterbankar. Merparten av filterbankarna är realiserade med någon slags moduleringsteknik (cosinus-, sinus- eller komplexmodulering). Den röda tråden genom avhandlingen är kombinationen av tämligen smala övergångsband och samtidigt låg aritmetisk komplexitet. Ett sätt att uppnå denna kombination är att använda sig av en teknik som heter frekvenssvarsmaskning och förkortas FRM. Denna metod har på ett framgångsrikt sätt använts i avhandlingen. En potentiell nackdel med FRMmetoden är att den medför en längre fördröjning genom systemet. Därför föreslås också ett sätt att syntetisera FRM-filter med låg fördröjning. Här optimeras filtren både med avseende på komplexitet och fördröjning samtidigt. En annan metod som utnyttjats för att kombinera relativt smala övergångsband med låg aritmetisk komplexitet är att använda IIR filter istället för FIR filter. Ett flertal exempel på filter och filterbankar, optimerade och syntetiserade i Matlab, illustrerar fördelarna med de föreslagna filter- och filterbanks-klasserna.
Filter banks are systems of several filters with a common input or a common output. They are used whenever a signal needs to be split into different frequency bands. Since the early seventies, the theory of digital filter banks has developed to a mature state. Today there exist numerous ways to design filter banks for different applications, such as image and audio coding, transmultiplexing in communication systems, echo cancellation, and analog-to-digital (A/D) conversion systems. However, earlier work has to a large extent been on the transfer function level, whereas in this thesis work, efficient realizations, important in e.g. low-power applications, are in focus. Further, most of the previous work have been focused on the perfect reconstruction (PR) case, which is, for many applications an unnecessarily severe restriction. It has been show that by relaxing the requirements on perfect reconstruction, and allowing the filter banks to have some errors, the arithmetic complexity can be reduced significantly. This thesis treats digital filters and uniform non-PR filter banks. A major part of the filter banks are realized using different modulation schemes (complex, cosine, or sine modulation). The governing idea through the thesis is the combination of frequency selectivity and low arithmetic complexity. One example on how to achieve frequency selective digital filters and filter banks with low arithmetic complexity is to use the frequency-response masking (FRM) approach. This approach together with the idea of using IIR filters instead of FIR filters is successfully used in the thesis. The price to pay for the reduced arithmetic complexity using FRM filters is unfortunately a longer overall delay. Therefore, some work has ben done in the field of low-delay FRM FIR filters as well. These filters are optimized on both low delay and low arithmetic complexity simultaneously. A number of design examples are included in order to demonstrate the benefits of the new classes of filters and filter banks.
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Rosenbaum, Linnéa. "On low-complexity frequency selective digital filters and filter banks /." Linköping : Department of Eelectrical Engineering, Linköpings universitet, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8930.

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Anderson, Martin S. "Design of two-dimensional PCAS digital filters and filter banks." Thesis, University of Warwick, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307968.

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Books on the topic "Filter"

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Filter. Charleston, S.C: CreateSpace, 2010.

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Evans, Mary. Filter. London: Institute of International Visual Arts (inIVA), 1997.

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Pariser, Eli. FILTER BUBBLE. München: Carl Hanser Verlag GmbH & Co. KG, 2012. http://dx.doi.org/10.3139/9783446431164.

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Hess, Wolfgang. Digitale Filter. Wiesbaden: Vieweg+Teubner Verlag, 1993. http://dx.doi.org/10.1007/978-3-322-96768-8.

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Marchthaler, Reiner, and Sebastian Dingler. Kalman-Filter. Wiesbaden: Springer Fachmedien Wiesbaden, 2017. http://dx.doi.org/10.1007/978-3-658-16728-8.

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Schmidt, Herrad, and Manfred Schwabl-Schmidt. Digitale Filter. Wiesbaden: Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-08526-1.

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Moschytz, George S., and Markus Hofbauer. Adaptive Filter. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-18250-1.

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Schmidt, Herrad, and Manfred Schwabl-Schmidt. Digitale Filter. Wiesbaden: Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-03523-5.

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No filter. New York: Bloomsbury Publishing, 2018.

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Filter design. Oxford, [England]: Newnes, 1997.

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Book chapters on the topic "Filter"

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Giron-Sierra, Jose Maria. "Kalman Filter, Particle Filter and Other Bayesian Filters." In Signals and Communication Technology, 3–148. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2540-2_1.

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Pirkle, Will C. "Audio Filter Designs: IIR Filters." In Designing Audio Effect Plugins in C++, 257–300. Second edition. | New York, NY : Routledge, 2019.: Routledge, 2019. http://dx.doi.org/10.4324/9780429490248-11.

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Pirkle, Will C. "Audio Filter Designs: FIR Filters." In Designing Audio Effect Plugins in C++, 434–57. Second edition. | New York, NY : Routledge, 2019.: Routledge, 2019. http://dx.doi.org/10.4324/9780429490248-16.

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Shive, John N., and Robert L. Weber. "Filter." In Ähnlichkeiten in der Physik, 135–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-76110-2_11.

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Burger, Wilhelm, and Mark James Burge. "Filter." In Digitale Bildverarbeitung, 93–124. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-04604-9_5.

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Seifart, M. "Filter." In Automatisierungstechnik 2, 159–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-58298-1_18.

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Seifart, M. "Filter." In Handbuch der Meß- und Automatisierungstechnik, 437–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-662-07701-6_28.

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Seifert, Franz. "Filter." In Elektrotechnik fur Informatike, 176–94. Vienna: Springer Vienna, 1988. http://dx.doi.org/10.1007/978-3-7091-3285-2_6.

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Bächtold, Werner, and Otto Mildenberger. "Filter." In Mikrowellentechnik, 14–58. Wiesbaden: Vieweg+Teubner Verlag, 1999. http://dx.doi.org/10.1007/978-3-322-91594-8_2.

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Meerkötter, Klaus. "Filter." In Informationstechnik kompakt, 81–125. Wiesbaden: Vieweg+Teubner Verlag, 1999. http://dx.doi.org/10.1007/978-3-322-90262-7_2.

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Conference papers on the topic "Filter"

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Mahlab, Uri, and Joseph Shamir. "Phase-only entropy optimized filter by simulated annealing." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.tuc5.

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The recently introduced concept of entropy optimized filters1 led to optical correlators of very good discrimination even in the presence of substantial noise. Various numerical procedures were found to be quite effective in the generation of regular holographic filters. However, the convergence of most of these algorithms was inadequate for phase-only filters due to the fast variations in these filters. In this work we show that procedures of simulated annealing are suitable also for the generation of phase-only filters leading to high quality performance. To improve the process of filter generation, electrooptic architectures are proposed for their implementation.
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Weinmeister, Justin, Dustin Ottinger, and Charlotte Barbier. "Helium Degassing Filter for Mercury Process Gas Liquid Separator." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-72699.

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Abstract Testing was conducted to find a suitable filter to help separate helium gas from the Spallation Neutron Source’s mercury process loop. This filter is proposed for installation on the gas-liquid separator (GLS) vent line to prevent a column of liquid mercury from flowing outside of the process loop shielding in the service bay. The filter’s desired properties are to prevent the passage of liquid mercury, provide minimal resistance to helium flow, resist radiation, operate for the lifetime of the target, be replaceable, and have a reliable construction. Testing concluded that the Mott Corporation POU-10-S series of filters provided the best performance available. The filters could stop most liquid mercury passage while allowing helium passage at nominal pressures above the GLS in standard conditions. This result has several implications for the design of the GLS vent system.
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Wilcox, Melissa, David Ransom, and Hector Delgado-Garibay. "Filter Failure During High Humidity Conditions." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-23641.

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The operation of a gas turbine, by its basic design, requires it to ingest enormous quantities of air. Even in relatively clean environments, a gas turbine may ingest hundreds of pounds of foreign matter each year of various sizes. Also, the more advanced the turbine design, the more sensitive it is to the quality of the air ingested. Filtration is applied to the inlet air to provide protection against the effects of contaminated air. Filters used with gas turbines are designed to remove a specified amount of particular contaminants. One type of filter is the high efficiency filter. These are often installed in order to capture particles less than ten microns. These filters are sometimes susceptible to water penetration. If the filter is not designed to remove water, then water can absorb soluble contaminants and carry them through the filter into the inlet of the gas turbine. In the case where harmful contaminants travel through the filter with the water, this can be potentially damaging to the gas turbine. For example, salt is soluble and can lead to hot corrosion in the turbine section. If water is allowed to reach the high efficiency filters then the water may carry contaminants through the gas turbine. In order to mitigate this phenomenon, many filter systems have mist removal systems. Even with a good mist removal system, humidity can reach the high efficiency filters. As humid air flows past the high efficiency filters, the decrease in air pressure can lead to water condensing on the filters. A procedure is presented in this paper which shows that filters that have been fully or near fully loaded with contaminants may experience condensation in an environment with high humidity. This paper reviews a thermodynamic analysis that is used to determine the conditions that must be met in order to experience this phenomenon. The possible occurrence of condensation further demonstrates the criticality of replacing inlet filters as soon as the filter pressure loss shows an upward trend.
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Batdorf, Brian J., Mike Jacobson, and Angus Macleod. "Cesium Atomic Resonance Filter." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.fmm3.

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Atomic resonance filters (ARF) have the unique property of simultaneously being wide angle and extremely narrowband. ARFs depend on atomic excitation of a contained gas at one wavelength and the fluorescence at a longer wavelength. By sandwiching the gas between two edge filters (the input filter transmitting at and below the excitation wavelength and the output filter transmitting at and above the fluorescence wavelength) the combination has throughput only from the gas resonance.
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Hanson, A. C., Robert D. Buzzard, James C. Kirsch, Jeffrey A. Loudin, and Don A. Gregory. "Composite filter for reducing target illumination angle dependence." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.thpp5.

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It has been found that binary phase only filters made of real-world scenes are sensitive to changes in the target illumination angle. The illumination angle dependence for several cases will be measured, and a novel technique for reducing this illumination angle sensitivity will be introduced. A filter composed of sections of several filters is used to reduce scene illumination dependence. These filters are made with the target illuminated from different angles, and the resultant filter is more tolerant to changes in target illumination. The filter construction technique as well as results obtained when such a filter is used will be discussed.
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Hall, Randolph L. "Experimental Aspects of Rugate Filter Fabrication." In Optical Interference Coatings. Washington, D.C.: Optica Publishing Group, 1995. http://dx.doi.org/10.1364/oic.1995.ma4.

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Substantial theoretical work has been done in the area of gradient-index filters since Jacobsson's original paper in 19661-18. In 1982, the term rugate (from the Latin, rugatus meaning wrinkled) filter was coined by the Air Force Materials Directorate to describe a particular class of gradient-index filters, namely multiple, superimposed, sinusiodally varying refractive index profiles. This paper will present various experimental aspects of rugate filter fabrication and show examples of fabricated filters.
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Greenlee, Alison, Timothy Murray, Victor Lesniewski, Mark Jeunnette, and Amos G. Winter. "Design and Testing of a Low-Cost and Low-Maintenance Drip Irrigation Filtration System for Micro-Irrigation in Developing Countries." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-35351.

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The cylindrical filters presently used in <1000 m2 drip irrigation systems are frequently clogged, increasing pressure loss and lowering the flow rate through the filters. This work investigates the mechanisms for this clogging and proposes an alternative filtration design that would enable both more reliable and lower maintenance filtering. This proposed system is compatible with existing drip irrigation systems and could be made inexpensively with plastic bottle manufacturing equipment. To compare the proposed design to off-the-shelf options, a drip irrigation test setup was built to measure the pressure loss across different filters as particles accumulated. These experiments confirmed that pleated cartridge filters, with high effective surface area, incurred lower pressure losses than cylindrical filters. These tests revealed that the greatest reason for clogged performance was that filtered particles (not the cartridge filter itself) eventually restricted the flow of water through the system. This inspired the redesign of the filter housing such that the housing extended far below the filter, providing a catch basin away from the filter for the particles to settle. Fixing the filter independently of the bottom casing significantly improved the overall performance of the filtration system, reduced the maintenance requirement necessary from the user, and would enable inexpensive manufacturing via blow molding. This paper experimentally demonstrates that the cartridge filter inside the redesigned housing can filter out over 2 kg of sand while maintaining less than a .03 bar pressure drop across the filter at a flow rate of 25 l/s.
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Li, Feng, Minghu Jiang, Lixin Zhao, and Yong Zhang. "Separation Characteristics Study on Hydrocyclone-Filter." In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57012.

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In order to improve the oilfield waste water treatment efficiency, a new type separation equipment hydrocyclone-filter is developed. With the main separating structure manufactured with PE-X series capillary material, the hydrocyclone-filter’s separating capability and the relationship between the oil concentration in the filtered water and the filtering speed are all discussed in detail. The tests in lab indicate that the top separating efficiency 99.5% can be gained when the split-ratio is 15% on the PE-8 capillary material cyclone body, and the value 15% is the optimal split-ratio to all type cyclone separating body (PE-X series).The new equipment hydrocyclone-filter offers a new measure to the sewage treatment in oil field.
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Dowski, Edward R., and W. Thomas Cathey. "Modern wavefront-based optical anti-aliasing filter." In International Optical Design Conference. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/iodc.1998.lfb.4.

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We have developed a completely new type of optical anti-aliasing filter that offers both high performance and low cost. In contrast to other wavefront-based anti-aliasing filters, this new filter can operate with multiple aperture stop positions. And in addition, this type of filter sufficiently attenuates all spatial frequencies beyond the CCD detector bandlimit. Many of the most popular anti-aliasing filters currently in use just null out very narrow bands of spatial frequencies.
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Sahay, Chittaranjan, Suhash Ghosh, Joseph Daniel Premkumar, and Siva Pooja Ramachandran. "Effect of Filter Type and Filter Size on Roundness/Circularity Measurement Using Different Mathematical Algorithms." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23575.

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Abstract In the manufacturing industry, it is almost inconceivable to produce a rotating component without a minimal amount of roundness tolerance. The importance of studying roundness form deviations of circular and cylindrical features is to avoid the excessive lateral or axial runout deviations of the rotating and reciprocating parts during dynamic operations. Considering the precision that industries require now and will require in the future, the authors of this article have chosen roundness (also called circularity per ASME Standards) as the measurable parameter. In order to arrive at precise results, the roundness of a near-to-perfect cylinder is measured on an accurate spindle and turn-table type measuring instrument. Roundness profile, when measured, can be filtered in various ways to reduce or eliminate unwanted details, with a cut-off value set in terms of undulations per revolution (UPR), which gives valuable information about how the component may function, under specific conditions. Looking at real-life roundness graphs it is clear that information exists in the data at different frequencies. A classic example is ovality, which indicates an irregularity that occurs two times in one complete revolution. The workpiece would be said to have two lobes or two UPR. Multiple lobes may be present on a component, a condition contributing to either problems of fit with mating components or part functionality. Additionally, usage of recommended or generalized filter, yields data that approximately lies in the range of acceptability. Thus, there is a strong need to thoroughly understand the effect of filter size and type on roundness (form error for fit) and part functionality. Many published articles have investigated novel filters to accurately and efficiently calculate roundness. However, no work was found in literature that would present the filter size and type selection criteria and correlate it with roundness depending on mathematical method of calculating roundness and further to part functionality. This paper focusses on the investigation of filter type and size effect on roundness based on different mathematical methods of roundness error calculations. By varying parameters like the filter type (Gaussian 50%, 75% and RC Filters), the filter sizes (1 through 500 UPR) and the methods of measuring the roundness — (Least Squares Circle (LSC), Minimum Circumscribed Circle (MCC), Maximum Inscribed Circle (MIC) and Minimum Zone Circles or Separation (MZC or MZS)), roundness at different heights of the workpiece is evaluated. A clear trend is observed from the results, which can further help one to choose filters and their respective sizes for the respective design intent or the application in question.
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Reports on the topic "Filter"

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Karns, Tristan, Kirk Reeves, and Murray Moore. Filter Test System for Nuclear Container Filters. Office of Scientific and Technical Information (OSTI), October 2020. http://dx.doi.org/10.2172/1673345.

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Putnam, Roger S. Aggregate Filter. Fort Belvoir, VA: Defense Technical Information Center, March 1989. http://dx.doi.org/10.21236/ada215029.

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Taylor, S., J. Lever, K. Burgess, R. Stroud, D. Brownlee, L. Nittler, A. Bardyn, et al. Sampling interplanetary dust from Antarctic air. Engineer Research and Development Center (U.S.), February 2022. http://dx.doi.org/10.21079/11681/43345.

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We built a collector to filter interplanetary dust particles (IDPs) larger than 5 µm from the clean air at the Amundsen Scott South Pole station. Our sampling strategy used long duration, continuous dry filtering of near-surface air in place of short duration, high-speed impact collection on flags flown in the stratosphere. We filtered ~107 m³ of clean Antarctic air through 20 cm diameter, 3 µm filters coupled to a suction blower of modest power consumption (5–6 kW). Our collector ran continuously for 2 years and yielded 41 filters for analyses. Based on stratospheric concentrations, we predicted that each month’s collection would provide 300–900 IDPs for analysis. We identified 19 extraterrestrial (ET) particles on the 66 cm² of filter examined, which represented ~0.5% of the exposed filter surfaces. The 11 ET particles larger than 5 µm yield about a fifth of the expected flux based on >5 µm stratospheric ET particle flux. Of the 19 ET particles identified, four were chondritic porous IDPs, seven were FeNiS beads, two were FeNi grains, and six were chondritic material with FeNiS components. Most were <10 µm in diameter and none were cluster particles. Additionally, a carbon-rich candidate particle was found to have a small ¹⁵N isotopic enrichment, supporting an ET origin. Many other candidate grains, including chondritic glasses and C-rich particles with Mg and Si and FeS grains, require further analysis to determine if they are ET. The vast majority of exposed filter surfaces remain to be examined.
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Hawley and Thorson. PR-015-15603-R02 Effect of Upstream Piping Components on Ultrasonic Flow Meter Accuracy. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), May 2016. http://dx.doi.org/10.55274/r0010915.

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This project investigated the velocity profile downstream from three commercially available dry gas filters and the effect of this profile on an ultrasonic meter installed in an AGA 9 default configuration. The inlet profile and condition of the filter element were varied to determine the sensitivity on the profile exiting the filter.
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Hawley and Thorson. PR-015-15603-R01 Effect of Upstream Piping Components on Ultrasonic Flow Meter Accuracy - Unblinded. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), May 2016. http://dx.doi.org/10.55274/r0010875.

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This project investigated the velocity profile downstream from three commercially available dry gas filters and the effect of this profile on an ultrasonic meter installed in an AGA 9 default configuration. The inlet profile and condition of the filter element were varied to determine the sensitivity on the profile exiting the filter.
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Morrison, Robert W. NBC Filter Performance. Fort Belvoir, VA: Defense Technical Information Center, October 2001. http://dx.doi.org/10.21236/ada397007.

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Alvin, M. A., T. E. Lippert, E. S. Diaz, and E. E. Smeltzer. Filter Component Assessment. Office of Scientific and Technical Information (OSTI), December 1996. http://dx.doi.org/10.2172/420334.

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Alvin, M. A., T. E. Lippert, E. S. Diaz, and E. W. Smeltzer. Filter component assessment. Office of Scientific and Technical Information (OSTI), November 1995. http://dx.doi.org/10.2172/124978.

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Hill, D., and H. E. Martinez. HEPA filter jointer. Office of Scientific and Technical Information (OSTI), February 1998. http://dx.doi.org/10.2172/650221.

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Canant, Philip A., Gary B. Bessee, and Scot A. Hutzler. Filter Effectiveness Evaluation. Fort Belvoir, VA: Defense Technical Information Center, August 2013. http://dx.doi.org/10.21236/ada621660.

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