Relevant bibliographies by topics / Disc filters

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  2. Dissertations / Theses
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Academic literature on the topic 'Disc filters'

Author: Grafiati
Published: 5 June 2025
Last updated: 16 July 2025

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Journal articles on the topic "Disc filters"

1

Ghaffari, Masoud, and Jaber Soltani. "Evaluation and Comparison of Performance in the Disc Filter with Sand Filters of Filtration Equipment in Micro Irrigation Systems." Modern Applied Science 10, no. 8 (2016): 264. http://dx.doi.org/10.5539/mas.v10n8p264.

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At the present time, the need to evacuate organic and green growth of algae contaminants in micro irrigation system is expanding increasingly. The worldwide populace is expanding and as a result of this, the world may encounter extraordinary fresh water shortage. Our water assets are constrained and, subsequently, water treatment and reusing strategies are the main choices for getting crisp and fresh water in the coming decades. This study examines the rate of the impact of green growth of algae existing in micro irrigation system performance on the disc filters and sand tanks in the examination field of water, soil and horticultural and agricultural commercial enterprises Vice-Presidency of Karaj.The analyses were performed in four scenarios comprising of ordinary disc filter together with sand tank, automated disc filter together with sand tank, automated disc filter without sand tank lastly common ordinary disc filter without sand tank. These scenarios were assessed and looked at in three classifications of physical quality of irrigation system water. Data collection and experiments was run up to three months. The results of the experiments demonstrated that concentration of organic and suspended materials is viewed as safe for low flow emitters. In the range of 50 through 100 mg per liter, automated disc filters represented a good performance. In the concentration of 100 mg/l or higher, the performance of disc filters significantly decreased; subsequently it is important to put the sand tank before disc filters.
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Lee, Sang-ik, Jin-Yong Choi, and Won Choi. "Effect of Groove Shape on Head Loss and Filtration Performance of Disc Filters." Water 13, no. 12 (2021): 1683. http://dx.doi.org/10.3390/w13121683.

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To analyze the effect of a groove cross-sectional shape on disc filters, a head loss analysis and filtration performance test were conducted using disc filters with different groove shapes (semi-elliptical- and trapezoidal-shaped grooves). Furthermore, the groove shapes were analyzed using field emission scanning electron microscopy and the relationship between flow rate and head loss was derived from the head loss test. Even if the filters were designed with the same mesh standard, the sectional areas of the grooves were different depending on the shape. Therefore, the head loss was compared under the condition that the grooves have the same sectional area by applying the relationship between head loss and sectional area, and a smaller head loss was observed in the semi-elliptical-shaped groove. Additionally, the semi-elliptical-groove-shaped disc filter was evaluated to sufficiently filter the soil particles corresponding to the 120 mesh standard. Therefore, an optimum disc filter can be designed by considering the cross-sectional shape of the disc groove to reduce energy consumption and provide stable filtration. The elliptical groove shape, which is hydraulically advantageous, is preferred for the disc filter design.
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Dalri, Alexandre B., Gilmar O. Santos, Geffson de F. Dantas, Rogério T. de Faria, José R. Zanini, and Luiz F. Palaretti. "Performance of drippers in two filtering systems using sewage treatment effluent." Revista Brasileira de Engenharia Agrícola e Ambiental 21, no. 6 (2017): 363–68. http://dx.doi.org/10.1590/1807-1929/agriambi.v21n6p363-368.

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ABSTRACT The objective of this study was to evaluate the performance of three models of drippers using treated sewage effluent, pure and diluted, and two types of filters, screen and disc. The treated sewage effluent used in the experiment was collected from the city’s treatment plant. The experiment included 12 lateral lines with three types of emitters to apply pure (100%) and diluted (50%) effluent filtered by screen and disc filters. The combination of those factors set the treatments: T1 (50% effluent diluted in fresh water filtered by a screen filter); T2 (50% effluent diluted in fresh water filtered by a disc filter); T3 (pure effluent filtered by a screen filter); T4 (pure effluent filtered by a disc filter). The results showed that the flat type emitter is less sensitive to clogging, the disc filter is the most suitable to prevent clogging and the use of pure or diluted sewage effluent increases the drippers’ flow rate coefficient of variation.
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Wilén, B. M., M. Cimbritz, T. Pettersson, and A. Mattsson. "Large scale tertiary filtration – results and experiences from the discfilter plant at the Rya WWTP in Sweden." Water Practice and Technology 11, no. 3 (2016): 547–55. http://dx.doi.org/10.2166/wpt.2016.063.

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This paper summarizes the results and experiences from the full-scale discfilter plant at the Rya WWTP. In 2010 the WWTP was extended with post-denitrification and a discfilter plant for tertiary filtration of the effluent in order to meet the new discharge limits of 10 mg total nitrogen and 0.3 mg/l of total phosphorus. The disc filters receive effluent from both the moving bed biofilm reactor (MBBR) and the secondary settlers. The disc filters are equipped with filter cloths with 15 µm pore openings. The concentration of suspended solids was generally kept below 5 mg/l and total phosphorus was <0.2 mg/l for approximately 60% of the days during the experimental period, with generally lower concentration of particles in the effluent from the disc filters during the summer. The mass load of suspended solids from the MBBR was higher compared to the load from the secondary settlers but this did not influence the concentration of suspended solids in the effluent from the disc filters. The particles in the MBBR effluent are larger and easier to filter compared to the secondary settler effluent which contain a larger number of small particles. During passage through the disc filters, some particles break-up leaving a larger number of particles (1–5 µm) in the effluent. Due to their small mass, this does not affect the effluent suspended solids concentration significantly. The removal of indicator and pathogenic microorganisms was only marginal. Since the discfilter plant has been placed in operation, the operational strategies have improved (e.g. more frequent cleaning of the filter cloths) which has increased the treatment capacity. The study demonstrates successful operation of a large discfilter plant with large variation in flow and particle loading.
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Airoldi, Rogerio Pereira da Silva, José Euclides Stipp Paterniani, Tulio Assunção Pires Ribeiro, and Marcelo Jacomini Moreira da Silva. "COMPARAÇÃO ENTRE ELEMENTOS FILTRANTES DE MANTA SINTÉTICA NÃO TECIDA E DE DISCO NO TRATAMENTO DE ÁGUA PARA IRRIGAÇÃO." IRRIGA 8, no. 3 (2003): 218–33. http://dx.doi.org/10.15809/irriga.2003v8n3p218-233.

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COMPARAÇÃO ENTRE ELEMENTOS FILTRANTES DE MANTA SINTÉTICA NÃO TECIDA E DE DISCO NO TRATAMENTO DE ÁGUA PARA IRRIGAÇÃO Rogério Pereira da Silva Airoldi José Euclides Stipp PaternianiTúlio Assunção Pires Ribeiro Marcelo Jacomini Moreira da SilvaDepartamento de Água e Solo, Faculdade de Engenharia Agrícola, Universidade Estadual de Campinas, Campinas, SP. CP 6011, CEP: 13083-970, E-mail:remiro@agr.unicamp.br. 1 RESUMO A pesquisa realizada propôs uma investigação experimental para a avaliação do desempenho dos meios filtrantes disco (130 mm) e manta sintética não tecida na filtração da água utilizada em um sistema de irrigação por gotejamento com fertirrigação organomineral. Utilizou-se água de um reservatório aberto, localizado no campo experimental da Faculdade de Engenharia Agrícola – UNICAMP, onde foi instalado um módulo de irrigação localizada para o estudo. O desempenho dos filtros foi avaliado através de análises físicas, químicas e biológicas da água afluente e efluente aos filtros, e da evolução da perda de carga nos mesmos. A pesquisa foi desenvolvida em três etapas de 30 dias, realizadas em diferentes estações do ano. Os resultados apontaram que não houve diferenças significativas entre os dois elementos filtrantes com relação à remoção de partículas em suspensão na água. No entanto, o filtro de disco apresentou menor perda de carga localizada em relação ao filtro de manta. Desta forma, concluiu-se que, para as condições experimentais de qualidade da água, o filtro de disco apresentou desempenho pouco superior ao filtro de manta. No entanto, podem-se desenvolver filtros especialmente adaptados aos elementos filtrantes de manta sintética para que a eficiência deste elemento supere a do disco, principalmente com relação à perda de carga. UNITERMOS: irrigação localizada, fertirrigação, filtração, qualidade de água. AIROLDI, R. P. da S.; PATERNIANI, J. E. S.; RIBEIRO, T. A. P.; SILVA, M. J. M. da COMPARISON OF NON-WOVEN SYNTHETIC FABRIC AND DISC FILTERS FOR IRRIGATION WATER TREATMENT 2 ABSTRACT The main purpose of this research was to evaluate the disc (130 mm) and non-woven synthetic fabric filter performance in water filtration using a trickle irrigation system with fertigation. The source of water used in this experiment was from an open reservoir, located in the experimental field of the Agricultural Engineer College – UNICAMP, where an experimental trickle irrigation system has been installed. The filter performance was evaluated through water analysis by physical, chemical and biological parameters and the head loss evolution on it. The research was developed over three phases of 30 days each in different seasons. The results have shown that there were not significant differences among filters concerning the water suspended particle removal. However, the disc filter presented lower head loss than the non-woven synthetic fabric filter. Therefore, for these water quality conditions the disc filter presented higher performance than the non-woven synthetic fabric filter, although non-woven synthetic fabric filters should be improved in order to obtain filters with reduced head loss and increased performance. KEYSWORDS: localized irrigation, fertigation, filtration, water quality.
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Zeng, Jiefeng, Peiling Yang, Weijie Liu, and Xudong Xiang. "Influence of Fractal Disc Filter Flow Channel Parameters on Filtration Performance." Applied Sciences 14, no. 17 (2024): 7505. http://dx.doi.org/10.3390/app14177505.

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The research and development of a new disc filter is a key link in intelligent irrigation systems, the core of efficient and water-saving irrigation development, and also an important joint effort to ensure a clean water source in micro-irrigation systems. In this paper, the independent research and development of the fractal flow passage disc filter was taken as the research object, and the disc filter numerical simulation cell (FLUENT) and artificial intelligence technology (Back Propagation Neural Network) were combined to optimize the filter flow channel parameters, including the tilt angle, the length and height of the bottom of the internal section triangle, the taper, the position and number of buffer slots, etc. A new type of disc filter with lower head loss, larger flow capacity, higher filtration efficiency, and longer running time is proposed. It has certain reference value and promotion significance for the future development and design of high-performance disc filters and their wide use.
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Biswas, Jagonnath, Tanbin Ahmed, Sazzad M. S. Imran, and Abul Kalam Azad. "Effective Noise Reduction Filters for Precise Temperature Measurement Using Brillouin Distributed Optical Fiber Sensors." Dhaka University Journal of Applied Science and Engineering 8, no. 1 (2024): 42–50. http://dx.doi.org/10.3329/dujase.v8i1.72992.

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This study explores the effectiveness of various noise reduction filters in accurately measuring temperature distributions over a 38.2 km single-mode fiber (SMF). Brillouin optical time-domain analysis (BOTDA) sensor is utilized to gather Brillouin gain spectra (BGSs), which are denoised using bilateral filter (BF), guided filter (GF), adaptive Wiener filter (AWF), non-local means filter (NLMF), average filter (AF) and disc filter (DF). The temperature distributions over the SMF are then determined by applying least-squares curve fitting (LSCF). The study assesses the efficacy of noise reduction filters considering signal-to-noise ratio (SNR), uncertainty in temperature measurement (UTM), experimental spatial resolution (ESR) and signal processing speed (SPS). Among six different filters, NLMF outperforms other filters which can provide SNR improvement of 10.22 dB for which the UTM can be improved by 58.93% without deteriorating the ESR of the sensor. The noise reduction using such filter can also provide 6.2% faster SPS. Therefore, NLMF can be considered as an effective noise reduction filter for the precise temperature measurement using BOTDA sensors. DUJASE Vol. 8 (1) 42-50, 2023 (January)
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Conder, J. R., and T. P. Liew. "Fine mist filtration by wet filters—III: Sintered disc filters." Journal of Aerosol Science 20, no. 1 (1989): 59–66. http://dx.doi.org/10.1016/0021-8502(89)90031-1.

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Zhu, Zi Xin, Jun Zhong Zheng, and Dong Chen. "Using Lubricating Oil Filter Debris Analysis to Monitor Abnormal Wear of Aero-Engine." Applied Mechanics and Materials 86 (August 2011): 821–24. http://dx.doi.org/10.4028/www.scientific.net/amm.86.821.

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With the installation of finer oil filters in the lubrication system of aero-engine, the traditional wear analysis techniques such as Rotating Disc Electrode Atomic Emission Spectrometry Analysis (RDE-AES) become less efficient at detecting abnormal wear failure caused by large debris. These filters capture large debris containing large amounts of tribological information about the operation of an aero-engine. Removal and analysis of the filter debris has proved to be an effective tool for aero-engine health management by determining wear modes and observing failure progression providing long lead times for maintenance. An automated aero-engine oil filter debris analysis system was recently developed. This instrument could efficiently complete filter core washing, debris amount and size distribution analysis, and prepare a patch of the debris for further composition analysis.
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Hsu, Ming Wei, Man Long Her, Wen Ko, and Yu Lin Wang. "Design and Analysis of Dual-Mode Double-Ring Resonator for Dual-Band Bandpass Filter Applications." Applied Mechanics and Materials 321-324 (June 2013): 376–82. http://dx.doi.org/10.4028/www.scientific.net/amm.321-324.376.

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In this paper, two types of miniaturized dual-mode bandpass filters (BPF), a single-ring (SR) resonator, and a double-ring (DR) resonator are developed. By applying the capacitive-coupling technique to a dual-mode ring filter, a technique is proposed to miniaturize the dual-mode double-ring filter. An adjustable dual-band bandpass filter is achieved by developing a ring resonator where the two modes are capacitively coupled. Control of the filter center frequency is determined by the diameter of the ring and by the rings annular width. Filter coupling amount can also be adjusted by disturbance (perturbation) of an open stub attached to the annular disc. Proposed filters explore both single- and double-ring architectures. A single-ring resonator acting as a dual bandpass filter to allow 3.8 GHz and 7.8 GHz single is developed. A double-ring resonator to allow 2.05 GHz and 3.9 GHz signals is also developed. The ring resonators are fabricated on RO-4003 substrate, with relative dielectric constant of 3.38, thickness of 0.8 mm, and dielectric loss tangent of 0.0025. Results indicate the filters can be applied in the communications field.
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Dissertations / Theses on the topic "Disc filters"

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Sun, Yongbin. "Development of electromagnetic fluid disc valves." Thesis, University of Surrey, 1993. http://epubs.surrey.ac.uk/843323/.

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The development of electrohydraulic floating-disc valves at the University of Surrey started in the early 1980's. The progress in the last ten years since then has shown that floating-disc valves have the advantages of fast response time, reliable operation, simple configurations, few critical dimensions with no precision sliding surfaces, leading to low cost design and manufacture. They have great potential to fill the gap between conventional solenoid valves and high precision servo valves. However, limitations existed in previous designs hindering further development; for instance relatively large moving mass, low hydraulic stiffness, difficulty of installing springs and poor null position when operating in proportional control mode. The work presented in this thesis concentrates on improving the disc valve electromagnetic characteristics, hydraulic stiffness, electric power consumption, operating reliability, valve size and cost. A novel diaphragm-disc force motor has been successfully developed through this research. The theoretical study and experimental work has shown that the force motor has the features of high spring stiffness, fast response, improved accuracy and linearity, and miniaturised size. By implementing a pair of permanent ring magnets, the diaphragm-disc force motor also has the advantages of lower electric power consumption, dual-lane for fail safety operation, and higher control accuracy. Due to the use of conventional mild steel instead of Remco B soft iron as the coil magnetic conductor material, the valve manufacturing cost has been further reduced. Above all, this novel configuration shows good prospects of competing with the existing torque motor due to its low cost and simple construction. The research described also involves designing and testing two prototype disc valves for specific applications. A single disc pilot valve associated with the diaphragm configuration and permanent magnet arrangement has been built for use in an aviation engine fuel supply system. It has a dual-lane operating mode with a valve size of 58x50x50 millimetres, which is the smallest valve yet made in the disc valve family. The initial test results showed that the valve has good linearity and a bandwidth of 60 Hz in a blocked-load condition. Another successfully built valve is an improved version of a position controlled double-disc valve for use in vehicle semi-active suspension systems. It has been demonstrated that using proportional plus derivative electronic network compensation, the valve can operate continually in the whole damper control domain with the characteristics of balanced fluid forces and low electric power consumption.
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Lanza, Luciana Fortunato Burgese. "Utilização dos filtros da radiologia computadorizada para a avaliação da opacificação do forame intervertebral associada às hérnias de disco em cães." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/10/10137/tde-03072013-092543/.

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O processamento é uma das principais características da radiografia digital. Diante da frequência da discopatia em cães, a importância do exame radiográfico na investigação inicial desta doença e na orientação de outros exames de imagem (tomografia computadorizada, mielotomografia e imagem por ressonância magnética), buscou-se avaliar a efetiva contribuição das ferramentas de processamento da imagem no diagnóstico das hérnias de disco. Para tanto, foram avaliados 80 forames intervertebrais através da radiologia computadorizada pelos filtros padrão, invertido e realce de borda e a combinação entre esses (padrão e invertido, padrão e realce de borda e realce de borda e invertido) para pesquisa da opacificação do forame intervertebral associada às hérnias de disco em cães. A análise radiográfica foi realizada por dois avaliadores às cegas com tempo de experiência superior a 10 anos em radiodiagnóstico. Foram calculadas as medidas de sensibilidade, especificidade, valores preditivos positivos e negativos, acurácia e razão de verossimilhanças para os respectivos filtros e a combinação destes pelos dois avaliadores. A tomografia computadorizada foi tomada como padrão ouro da detecção de opacificação do forame intervertebral. O coeficiente de kappa e seu respectivo intervalo de 95% de confiança foram utilizados para analisar a concordância dos resultados. Os valores de sensibilidade obtidos pelos avaliadores foram de 58,7% na detecção das opacificações pelo filtro padrão, 52,2% pelo filtro invertido e 50% de sensibilidade no estudo realizado pelo filtro realce de borda. Na combinação entre os filtros padrão e invertido e realce de borda e invertido os valores foram os mesmos com 43,5%, sendo que a sensibilidade do filtro padrão associado com o filtro realce de borda foi de 50%. A acurácia alcançada na detecção das opacificações do forame intervertebral pelos filtros individualmente foi de 78,8% para o filtro padrão, 75% para o filtro invertido e 75,6% para o filtro realce de borda, não apresentando diferenças significativas quando a combinação entre os filtros foi realizada, obtendo-se 76,9% nas associações entre os filtros padrão e invertido e padrão e realce de borda e 75,6% através dos filtros realce de borda e invertido. O processamento da imagem digital pode aumentar a acurácia na detecção das opacificações do forame, no entanto os filtros podem somente realçar uma alteração existente e não aumentar a capacidade de detecção da lesão pelo exame radiográfico simples sendo necessária para tal, a associação de exames de imagem mais sensíveis (mielografia/tomografia computadorizada/ imagem por ressonância magnética). A preferência pessoal na utilização dos filtros também foi comprovada.<br>Processing is a major feature of digital radiography. Given the frequency of disc disease in dogs, the importance of radiographic examination in the initial investigation of this disease and the guidance of other imaging studies (computed tomography, myelography and magnetic resonance imaging), it was evaluate the effective contribution of the processing tools image in the diagnosis of herniated discs. For this, eigthy intervertebral foramina through were evaluated computed radiography by standart filters, reverse and edge enhancement and the combination of these (standard and inverted pattern, standard and edge enhancement and edge enhancement and inverted) in the investigation of opacification of the intervertebral foramen associated with hernia disc in dogs. Radiographic analysis was performed by two raters blind to time of more than 10 years experience in diagnostic radiology. It was calculated measures of sensitivity, specificity, positive and negative predictive values, accuracy and likelihood ratio for the respective filters and the combination of the two evaluators. Therefore, the CT scan was taken as the gold standard of detection opacification of the intervertebral foramen. The kappa coefficient and its corresponding interval of 95% confidence intervals were used to analyze the correlation of the results. The sensitivity values obtained by the evaluators were 58.7% in detecting the opacities of the standard filter, the filter inverted 52.2% and 50% sensitivity in the study by edge enhancement filter. In combination between standard and inverted filters and edge enhancement and inverted values were the same with 43.5%, and the sensitivity of the filter pattern associated with the filter edge enhancement was 50%. The accuracy achieved in the detection of opacities of the intervertebral foramen by the filters individually was 78.8% for the standard filter, 75% to inverted filter and 75.6% for edge enhancement filter, showing no significant differences when the combination between the filters was performed. yielding 76.9% associations between the filters standard and inverted pattern, and pattern and edge enhancement and 75.6% through the filter edge enhancement and inverted. The digital image processing can increase the accuracy in the detection of opacities foramen, however filters can only highlight a change and not increase the existing capacity of lesion detection by simple radiographic examination is necessary association of more sensitive imaging ( myelography / CT / MRI). Personal preference through the use of filters was also confirmed.
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González, Sánchez María Fernanda. "Separate treatment of wash water from sand filter using disc filter technology." Thesis, KTH, Mark- och vattenteknik (flyttat 20130630), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-171843.

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The purpose of this study is to evaluate the convenience and effectiveness of using a disc filter to treat washing water from the sand filters at Sundet wastewater treatment plant. The disc filter is used aiming for the reduction of suspended solids and phosphorus. The study was divided in two main experimental stages. During the first stage laboratory jar-tests were performed in order to identify which flocculation aid was more suitable, this was further on used to improve the water treatment. Based on the laboratory trials results, two different polymers (1 and 2) were chosen to be tested at pilot scale. The second stage involved the pilot filter operation itself; this period was as well divided in two sub-stages where filter cloths with two different pore openings were tested. During the first sub-stage the pilot operated with an 18 μm pore opening filters cloth and both polymers. At the end of the first half polymer 1 showed to be more efficient and so it was further used throughout the second sub-stage in combination with a 10μm pore opening filter cloth. As from theoretical knowledge the phosphorus and suspended solid removal were expected to be between 75% and 90%, results which were achieved during both laboratory trials and pilot filter. The best results were observed with the 10μm pore opening filter cloth and polymer 1. Also, additional results from pilot trials performed at Sundet after the study period are presented.
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Eraydin, Mert Kerem. "Evaluation of Novel Fine Coal Dewatering Aids." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/34182.

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The costs of cleaning fine coal are substantially higher than those of cleaning coarse coal. Therefore, many many coal companies in the U.S. choose to discard fine coal (150 micron x 0) by means of 6-inch diameter hydrocyclones. The cyclone overflows are stored in fine coal impoundments, which create environmental concerns and represent loss of valuable national resources. The major component of the high costs of cleaning fine coal is associated with the difficulty in fine coal dewatering. Therefore, the availability of efficient of fine coal dewatering methods will greatly benefit companies. In the present study, three different novel dewatering aids have been tested. These include Reagents W (RW), Reagent U (RU), and Reagent V (RV). These reagents are designed to increase the contact angles of the coal samples to be dewatered, which should help decrease the Laplace pressure of the water trapped in filter cake and, hence, increase dewatering rate. They were tested on i) the fresh coal samples from Consolidation Coal Corporation's Buchanan Preparation Plant, ii) a composite drill core sample from the Smith Branch Impoundment, Pinnacle Mine Mining Company, and iii) a blend of coals from the Smith Branch Impoundment, thickener underflow, and thickener feed. The coal samples were used initially for laboratory-scale tests using a 2.5-inch diameter Buchner vacuum filter. The results showed that the use of the novel dewatering aids can reduce the cake moisture up to 50% over what can be achieved without using any dewatering aid. The use of the dewatering aids also increased the kinetics of dewatering by up to 6 times, as measured by cake formation times. On the basis of the laboratory test results, pilot-scale continuous vacuum filtration tests were conducted using a 2-feet diameter Peterson vacuum disc filter. The cake moistures obtained in the pilot-scale test work were similar to those obtained in the laboratory tests, while the fast dewatering kinetics observed in the laboratory tests was manifested as higher throughput. It was found that high-shear agitation is essential for achieving low cake moistures and high throughput.<br>Master of Science
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Smith, Brian Derek Ernan. "Synthesisable VLSI architectures for disk drive and telecommunication applications." Thesis, Queen's University Belfast, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263511.

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Ohlsson, Henrik. "Studies on Design and Implementation of Low-Complexity Digital Filters." Doctoral thesis, Linköping : Dept. of Electrical Engineering, Univ, 2005. http://www.ep.liu.se/diss/science_technology/09/49/index.html.

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Gustafsson, Oscar. "Contributions to low-complexity digital filters /." Linköping : Univ, 2003. http://www.bibl.liu.se/liupubl/disp/disp2003/tek837s.pdf.

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Deng, Ken Kan. "Piezoelectric MEMS disk resonator and filter based on epitaxial Al0.3Ga0.7As Films." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/4157.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2006.<br>Thesis research directed by: Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Zhu, Xi. "High frequency CMOS integrated filters for computer hard disk drive and wireless communication systems." Thesis, University of Hertfordshire, 2008. http://hdl.handle.net/2299/2069.

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Operational transconductance amplifier and capacitor (OTA-C) filters have outstood among different types of filter due to high frequency and low power capabilities in the main stream digital CMOS technology. They have been widely used in computer hard disk drive (HDD) and wireless communication transceivers. OTA-C filters based on cascade and passive ladder simulation are well-known. However, multiple loop feedback (MLF) OTA-C filters which have certain advantages still have the scope for further research. So far there have been no explicit formulas for current-mode leapfrog (LF) filter design and performance evaluation of current-mode MLF OTA-C filters are still lacking. From application viewpoints, read channels for computer hard disk drives require very high frequency continuous-time filters. This automatically disqualifies active- RC/MOSFET-C filters and OTA-C filters become the only solution. In wireless communications, active-RC/MOSFET-C filters have been proved useful for mobile systems whose baseband frequency falls below a few MHz. However, for wireless LANs with the frequency of several tens of MHz, OTA-C filters are a strong candidate. Whilst in HDD read channels, cascaded OTA-C architectures have been most utilized and in wireless receivers, OTA-C structures based on ladder simulation have been popular, MLF OTA-C filters have not been practically used in either of the applications. This thesis describes some novel designs and applications of multiple loop feedback OTA-C filters with extensive CMOS simulations. Analogue filters for computer hard disk drive systems are first reviewed; the state of the art and design considerations are provided. Three VHF linear phase lowpass OTA-C filters are then designed, which include a seventh-order and a fifth-order current-mode filter based on the follow-the-leader-feedback (FLF) structure and a seventh-order voltage-mode filter using the inverse FLF (IFLF) configuration. These filters all have very low power consumption. The synthesis and design of general current-mode LF OTA-C filters are conducted next. Iterative design formulas for both all-pole and finite-zero functions are derived and explicit formulas for up to sixth-orders are given. These formulas are very easy to use for designing any type of characteristics. Subsequently, linear phase lowpass OTA-C filter design for HDD read channels using LF structures are investigated in details. A current-mode filter and a voltage-mode filter using the fifth-order LF structure are presented. The two filters can operate up to 800MHz and have very small passband phase ripple. Analogue filters for wireless communication baseband applications are also reviewed thoroughly in this thesis, where the design of a fourth-order current-mode FLF Butterworth lowpass OTA-C filter for multi-standard receivers is presented. Then two fifth-order current-mode elliptic lowpass OTA-C filters based on respective LF and FLF structures for wireless communication baseband are designed. Fifth-order voltage-mode IFLF and LF elliptic lowpass filters are also presented. All these MLF baseband filters designed can operate up to 40MHz to cover all important wireless and mobile standards. Simulations show that the LF structures have better dynamic range and stopband attenuation performances than the FLF and IFLF configurations.
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Malmqvist, Robert. "Tuneable recursive active monolithic microwave integrated circuit filters /." Linköping : Univ, 2001. http://www.bibl.liu.se/liupubl/disp/disp2001/tek698s.pdf.

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Books on the topic "Disc filters"

1

Niffenegger, Bill. Photoshop Filters Toolkit Disk. RH Information Group, 1994.

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Active Filter Design Handbook Disk. John Wiley and Sons Ltd, 1987.

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Fred J. Taylor - undifferentiated. Digital Filter Design Software for the IBM PC With Disk. Marcel Dekker, 1987.

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Rorabaugh, C. Britton. Circuit Design and Analysis: Featuring C Routines/Book and Disk. McGraw-Hill Companies, 1991.

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Rorabaugh, C. Britton. Circuit Design and Analysis: Featuring C Routines/Book and Disk. McGraw-Hill Companies, 1991.

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Padilla, Luis, Kamyre Neyra, Vladimir Huacasi, and Sonia Macedo. Efecto antibacterial in vitro del extracto etanolico de Hibiscus sabdariffa L. sobre cepas de Streptococcus mutans. Instituto Universitario de Innovación Ciencia y Tecnología Inudi Perú, 2022. http://dx.doi.org/10.35622/inudi.b.012.

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La caries dental es una de las enfermedades más frecuentes a nivel mundial y debido a su prevalecía se comenzó a utilizar la fitoterapia como tratamiento alternativo, la Hibiscus sabdariffa L. posee gran variedad de propiedades terapéuticas de las cuales en este estudio destaca su actividad antibacterial. Objetivo: El objetivo de esta investigación fue determinar el efecto antibacterial in vitro del extracto etanólico de Hibiscus sabdariffa L. sobre cepas de Streptococcus mutans a las 24 y 48 horas. Materiales y métodos: La investigación fue aplicativa de diseño experimental y medición prospectiva. La muestra fue obtenida de pacientes que firmaron el consentimiento informado para así poder obtener las cepas de Streptococcus mutans. Se cultivaron en 16 placas Petri y en cada placa se distribuyeron 7 discos de papel filtro N°4, la técnica fue de difusión por disco de Kirby Bauer con pozos, con un total de 112 discos y pozos; las placas Petri se dividieron en 4 grupos de acuerdo a las concentraciones del extracto etanólico de Hibiscus sabdariffa L. que se obtuvo por maceración con alcohol al 96% para obtener una muestra al 100% extracto etanólico de Hibiscus sabdariffa L. y para obtener las concentraciones de 25%, 50% y 75% se utilizó alcohol para realizar las diluciones. Se consideró la clorhexidina al 0.12% como control positivo y al agua destilada como control negativo. Resultados: Sé demostró que la Hibiscus sabdariffa L. tiene efecto inhibitorio. El mejor efecto se registró a las 48 horas al 100% de concentración. Obteniendo un halo de inhibición de 14.23mm. Conclusión: El extracto etanólico de la Hibiscus sabdariffa L. sí tiene efecto antibacterial in vitro sobre las cepas de Streptococcus mutans.
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Book chapters on the topic "Disc filters"

1

Pal, Deepika, Vikrant Bhateja, Archita Johri, and Babita Pal. "Localization of Optic Cup-Disc in Retinal Images Using Morphological Filters for Glaucoma Detection." In Smart Computing Techniques and Applications. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0878-0_80.

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Abendroth, Martin, Shahin Takht Firouzeh, Meinhard Kuna, and Bjoern Kiefer. "Determination of the Temperature-Dependent Fracture and Damage Properties of Ceramic Filter Materials from Small Scale Specimens." In Multifunctional Ceramic Filter Systems for Metal Melt Filtration. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-40930-1_23.

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AbstractOpen cell ceramic foam filters are used to improve the quality of metallic cast products. They play a major role on reducing the number of inclusions within the microstructure of the cast product and restraining the liquid flow inside the mold. The newly developed carbon-bonded alumina ceramics are investigated considering the mechanical and thermal loads of the filtration process. The aim of this project is to assess the strength, the fracture mechanical behavior, and the damage properties of the filter material. Since the tiny struts of the foam have different properties than the common bulk material specimen, small specimens of millimeter size are needed. Within this work, a combination of experiments and numerical simulations are conducted for various mechanical tests at temperatures up to 1500 $${}^{\circ }\text {C}$$ ∘ C . The first test is the small punch test (SPT), where a small disk-like specimen is supported on a circular die and loaded with a spherical tipped punch until failure of the disk occurs. The small punch fracture stress is obtained from the experiments, as well as the corresponding parameters of the Weibull distribution necessary for the evaluation of the cold modulus of rupture (CMOR). Furthermore, a modified version of the SPT, the so called ball on three ball test (B3B), is carried out. In the B3B test, miniaturized disk-shaped specimens are supported with three spherical balls and loaded with a spherical tipped punch until failure. Hereby, the fracture mechanical parameters, such as the fracture toughness, are identified with the help of numerical simulations. Moreover, the Chevron notched beam test (CNB) is used to determine the fracture toughness of the ceramics. The final test is the Brazilian disc test (BDT), where compressive loads are exerted on the specimen leading to tensile stresses along the specimen diameter, perpendicular to the applied load direction. This test is employed to determine the Young’s modulus, the yield stress and the fracture toughness. In general the simplicity of all these tests, their setup, application, and results evaluation, in addition to the ease of specimens production, make them very attractive. The size of these specimens is about one order of magnitude smaller than that of common standard tests. The accompanying numerical simulations are inevitable to extract from the measurements the wanted mechanical properties.
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Dashtbozorg, Behdad, Jiong Zhang, Fan Huang, and Bart M. ter Haar Romeny. "Automatic Optic Disc and Fovea Detection in Retinal Images Using Super-Elliptical Convergence Index Filters." In Lecture Notes in Computer Science. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-41501-7_78.

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Zilly, Julian G., Joachim M. Buhmann, and Dwarikanath Mahapatra. "Boosting Convolutional Filters with Entropy Sampling for Optic Cup and Disc Image Segmentation from Fundus Images." In Machine Learning in Medical Imaging. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-24888-2_17.

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Rangayyan, Rangaraj M., Xiaolu Zhu, and Fábio J. Ayres. "Detection of the Optic Disc in Images of the Retina Using Gabor Filters and Phase Portrait Analysis." In IFMBE Proceedings. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89208-3_111.

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Dianwen, Liu, and Xu Kuangdi. "Rotary Disk Vacuum Filter." In The ECPH Encyclopedia of Mining and Metallurgy. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-0740-1_533-1.

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Gooch, Jan W. "Filter Paper Disk Method." In Encyclopedic Dictionary of Polymers. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_13753.

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Dianwen, Liu. "Rotary Disk Vacuum Filter." In The ECPH Encyclopedia of Mining and Metallurgy. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-2086-0_533.

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White, Peter C. "A Rotating Filter Disc Alternative to Photodiode Array Detection Systems." In BIOACTIVE ANALYTES, Including CNS Drugs, Peptides, and Enantiomers. Springer US, 1986. http://dx.doi.org/10.1007/978-1-4757-1892-8_26.

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Castilho, Leda R., F. Birger Anspach, and W. D. Deckwer. "Separation of Mammalian Cells Using a Specially Designed Rotating Disc Filter." In Animal Cell Technology: From Target to Market. Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0369-8_89.

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Conference papers on the topic "Disc filters"

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Mae, Masahiro. "Data-Driven Multiple Resonant Filter Design Integrating Notch Filters and Peak Filters in Dual-Stage Actuator Hard Disk Drives." In 2025 IEEE International Conference on Mechatronics (ICM). IEEE, 2025. https://doi.org/10.1109/icm62621.2025.10934774.

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Michniewich, James J. "Field Experience with Corrosion of Computer Equipment." In CORROSION 1985. NACE International, 1985. https://doi.org/10.5006/c1985-85324.

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Abstract All electronic computer equipment is affected by water vapor, airborne particulates and parts per billion quantities of corrosive gases. A study of field problems has been made over the last several years by monitoring the actual computer site environments and doing laboratory tests on filters, modules and disk products. This study has revealed how the many environmental variables interact with each other and how they effect certain parts of the computers and disks. Our equipment has had design changes incorporated so that it can survive in marginal contaminated sites. Severely contaminated sites would require the customer to chemically filter or isolate the computer site from the contamination source. The ultimate value of this study was to influence design improvements, specify site environmental limits, to train field personnel to recognize potential corrosive sites, and how to protect computer electronic equipment. This paper will use a small percentage of the field studies to show how the corrosive variables actually effect computer equipment.
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Hahn, Jürgen. "Vacuum disc filters go beyond." In Paste 2023: 25th International Conference on Paste, Thickened and Filtered Tailings. University of Alberta and Australian Centre for Geomechanics, Edmonton and Perth, 2023. http://dx.doi.org/10.36487/acg_repo/2355_68.

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Barnett, John, and Ben Otsap. "Diffusion bonded, high efficiency etched disc filters." In 35th Joint Propulsion Conference and Exhibit. American Institute of Aeronautics and Astronautics, 1999. http://dx.doi.org/10.2514/6.1999-2328.

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Cirneanu, Stefan, Loretta Ichim, and Dan Popescu. "Improvement of Optic Disc Localization using Gabor Filters." In 2018 41st International Conference on Telecommunications and Signal Processing (TSP). IEEE, 2018. http://dx.doi.org/10.1109/tsp.2018.8441261.

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Ostergaard, Halsey, Patrick Dailey, Mahabub Alam, and John Parmigiani. "Permeability Testing of Ceramic Foam Filters." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-52101.

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The construction and validation of an apparatus for measuring the permeability of ceramic foam filters (CFFs) at varying water flow rates is presented here. Commercially available CFFs are specified by pores per inch, which does not uniquely determine the flow characteristics of CFFs. Permeability, the pressure drop per unit filter thickness as a function of velocity, is desired for modeling and quality control purposes. Permeability is typically described with the Forchheimer equation, which can be broken into linear (Darcy) and quadratic (non-Darcy) components. Linear dependence comes from laminar flow at low flow rates, and is scaled by viscosity, while the square dependence dominates at high flow rates, and is scaled by fluid density. CFF measurement systems are not commercially available, and while several examples are found in literature, they are expensive and labor intensive to operate, and are usually limited to specific sizes of filter. The methodology, apparatus, and verification work presented here aims to reduce the cost, time, and complexity of measuring the permeability of commercially available CFFs of different sizes and porosities. Water is used as the working fluid, which is pumped through a CFF held in a modular cartridge. Pressure transducers are mounted close to the filter on either side. For testing different diameters of commercially available CFFs, different inlet and outlet pipe sizes are used to approximately match the diameter of the filter. This approach avoids the need for computational modeling of an effective filter diameter when the pipe and filter diameters do not match. Long, straight rigid pipe runs are used on the inlet to ensure fully developed flow profiles. Flow is measured with a magnetic flow meter. Pressure drop and flow rate are recorded at discrete flow rates after allowing the system to settle to a constant flow rate. A continuously variable methodology was evaluated and rejected. During testing, it was found that the decreased viscosity of water heated by the pump during long testing runs affected the measured permeability. To compensate, water temperature is measured during each run, and the viscosity is calculated for each run. The linear and quadratic permeability coefficients are determined by fitting a quadratic model through pressure drop data as a function of flow rate. In order to verify the accuracy of the device, a validation disc was created. A 49.6 mm disc of aluminum was drilled with 1,467 evenly spaced holes. An analytical formula from literature was used to calculate the theoretical permeability of the array. The measured permeability was below the calculated value, but surface defects in the disk were shown to have a large impact on measured permeability.
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Zhang, Bob, and Fakhreddine Karray. "Optic disc and fovea detection via multi-scale matched filters and a vessels' directional matched filter." In 2010 International Conference on Autonomous and Intelligent Systems (AIS). IEEE, 2010. http://dx.doi.org/10.1109/ais.2010.5547050.

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Hahn, Jürgen, Reinhard Bott, and Thomas Langeloh. "Economical dewatering of tailings for mine backfill with high performance disc filters." In Eleventh International Symposium on Mining with Backfill. Australian Centre for Geomechanics, Perth, 2014. http://dx.doi.org/10.36487/acg_rep/1404_01_hahn.

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Deleniv, A., A. Eriksson, and S. Gevorgian. "Four-Pole Tunable Band-Pass Filters Based on Two Dual Mode SrTiO3 Disc Resonators." In 32nd European Microwave Conference, 2002. IEEE, 2002. http://dx.doi.org/10.1109/euma.2002.339265.

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Zilly, Julian G., Joachim M. Buhmann, and Dwarikanath Mahapatra. "Boosting Convolutional Filters with Entropy Sampling for Optic Cup and Disc Image Segmentation from Fundus Images." In Ophthalmic Medical Image Analysis Second International Workshop. University of Iowa, 2015. http://dx.doi.org/10.17077/omia.1039.

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Reports on the topic "Disc filters"

1

Capsule- and disk-filter procedure. US Geological Survey, 2016. http://dx.doi.org/10.3133/twri9a55.2.1.a.

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