Relevant bibliographies by topics / Absorptive filters

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Academic literature on the topic 'Absorptive filters'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Absorptive filters"

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Bonmati-Carrion, Maria Angeles, Javier Padilla, Raquel Arguelles-Prieto, Anna M. Österholm, John R. Reynolds, Juan Antonio Madrid, and Maria Angeles Rol. "Electrochromic selective filtering of chronodisruptive visible wavelengths." PLOS ONE 15, no. 11 (November 5, 2020): e0241900. http://dx.doi.org/10.1371/journal.pone.0241900.

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We present evidence of pupil response modification, as well as differential theoretical melatonin suppression through selective and dynamic electrochromic filtering of visible light in the 400–500 nm range to minimize chronodisruptive nocturnal blue light exposure. A lower activation of intrinsically photosensitive retinal ganglion cells (ipRGCs), the first step for light to reach a human’s internal clock, is related to melatonin secretion therefore avoiding detrimental effects of excessive blue light exposure. Pupillary Light Reflex and Color Naming were experimentally assessed under light filtered by two different coloration states (transmissive and absorptive) of these novel dynamic filters, plus an uncoated test device, in 16 volunteers. Also, different commercial light sources at illuminances ranging from 1 to 1000 lux were differentially filtered and compared in terms of theoretical melatonin suppression. Representative parameters of the pupil responses reflected lower pupil constriction when the electrochromic filters (ECFs) were switched on (absorptive state, blue light is absorbed by the filter) compared to uncoated filters (control sample), but failed to do so under transmissive state (blue light passes through the filter) indicating less activation of ipRGCs under absorptive state (although no significant differences between states was found). Out of eight colors tested, just one showed significant differences in naming between both filter states. Thus, the ECF would have some protecting effect on ipRGC activation with very limited changes in color perception. While there are some limitations of the theoretical model used, the absorptive state yielded significantly lower theoretical melatonin suppression in all those light sources containing blue wavelengths across the illuminance range tested. This would open the way for further research on biological applications of electrochromic devices.
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Gomez-Garcia, Roberto, Jose-Maria Munoz-Ferreras, and Dimitra Psychogiou. "Symmetrical Quasi-Absorptive RF Bandpass Filters." IEEE Transactions on Microwave Theory and Techniques 67, no. 4 (April 2019): 1472–82. http://dx.doi.org/10.1109/tmtt.2019.2895531.

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Wollack, E. J., D. T. Chuss, K. Rostem, and K. U-Yen. "Impedance matched absorptive thermal blocking filters." Review of Scientific Instruments 85, no. 3 (March 2014): 034702. http://dx.doi.org/10.1063/1.4869038.

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Nikolova, Nina, and Emil Nikolov. "Absorptive Repetitive Filters with Operators of Generalized Fractional Calculus." Cybernetics and Information Technologies 13, no. 4 (December 1, 2013): 42–53. http://dx.doi.org/10.2478/cait-2013-0052.

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Abstract : An essentially new class of repetitive fractional disturbance absorptive filters in disturbances absorbing control systems is proposed in the paper. Systematization of the standard repetitive fractional disturbance absorptive filters of this class is suggested. They use rational approximations of the operators for fractional integration in the theory of fractional calculus. The paper discusses the possibilities for repetitive absorbing of the disturbances with integer order filters and with fractional order filters. The results from the comparative analysis of their frequency characteristics are given below.
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Zakirullin, R. S. "Diffraction in grating optical filters with angular-selective light transmission." Computer Optics 44, no. 3 (June 2020): 343–51. http://dx.doi.org/10.18287/2412-6179-co-654.

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The effect of diffraction on the directional light transmittance of grating optical filters designed for smart windows is studied. The filter has an angular selective light transmission due to two thin-film gratings formed by "non-transmissive" (absorptive, reflective or scattering) parallel strips on the surfaces of a single or double glazed window. Methods are considered for calculating the op-timal slope angle of two filter’s gratings, their relative position on the opposite window surfaces and the widths of the strips of both gratings to minimize light transmission on a specific date and time of day for a given latitude and longitude of the building and azimuth of the window. A meth-od has been developed for calculating the diffraction at the input and output gratings of the filter with regard for a complex movement of the Sun relative to the window and a corresponding change in the incidence angle of the solar beams on the gratings. To evaluate a decrease in the light transmittance of the filter due to diffraction, an additional factor is introduced into the calcu-lation equation. Geometric parameters of the filters and diffraction are calculated. The values of the diffraction factor are 0.9999992 and 0.9999998 for single or double glazed windows, respec-tively, i.e., the influence of diffraction on the light transmittance of the grating filter can be ne-glected.
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Dutta, Roy. "A new lumped element bridged-T absorptive band-stop filter." Facta universitatis - series: Electronics and Energetics 30, no. 2 (2017): 179–85. http://dx.doi.org/10.2298/fuee1702179d.

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Following a brief review of previous work on bandstop filters, the inadequacy of a recent work to obtain a perfect notch or perfect absorption at the notch frequency ?0 is demonstrated. A simple and elegant alternative solution, based on purely analytical arguments, is then presented. The resulting network is shown to achieve perfect matching as well as perfect absorption at the notch frequency and has several other advantages. A comparison has also been made with the conventional bridged-T band-stop filter.
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Chien, Shih-Huan, and Yo-Shen Lin. "Novel Wideband Absorptive Bandstop Filters With Good Selectivity." IEEE Access 5 (2017): 18847–61. http://dx.doi.org/10.1109/access.2017.2752903.

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Baek, Seonghyeon, and Iljae Lee. "Effect of leakage and blockage on the acoustic behavior of particle filters." Noise Control Engineering Journal 67, no. 6 (November 1, 2019): 483–92. http://dx.doi.org/10.3397/1/376744.

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The effects of leakage and blockage on the acoustic performance of particle filters have been examined by using one-dimensional acoustic analysis and experimental methods. First, the transfer matrix of a filter system connected to inlet and outlet pipes with conical sections is measured using a two-load method. Then, the transfer matrix of a particle filter only is extracted from the experiments by applying inverse matrices of the conical sections. In the analytical approaches, the one-dimensional acoustic model for the leakage between the filter and the housing is developed. The predicted transmission loss shows a good agreement with the experimental results. Compared to the baseline, the leakage between the filter and housing increases transmission loss at a certain frequency and its harmonics. In addition, the transmission loss for the system with a partially blocked filter is measured. The blockage of the filter also increases the transmission loss at higher frequencies. For the simplicity of experiments to identify the leakage and blockage, the reflection coefficients at the inlet of the filter system have been measured using two different downstream conditions: open pipe and highly absorptive terminations. The experiments show that with highly absorptive terminations, it is easier to see the difference between the baseline and the defects.
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Rahman, Akhlaq, and Jim Norman. "Influence of Different Packaging and Footprint Technique for Microwave Absorptive Bessel Filter's Performance." International Symposium on Microelectronics 2012, no. 1 (January 1, 2012): 001073–77. http://dx.doi.org/10.4071/isom-2012-thp23.

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In present day's ultra high speed data transmission environment, passive filters play a very important and critical function to achieve high-end system performance, especially in Microwave frequency ranges of 10 GHz or higher. Excellent electrical specification such as accurate −3dB cutoff frequency bandwidth, stable group delay, along with VSWR characteristics are very important parameters for system performance. Filters mechanical specification is similarly important, if not more. Products need not only be in certain size to fit in the board but also needs to be complement with other components. As available space in PCB become miniature for each component, filters footprint as well as via position need to be in certain ways to optimize board space and performance. Packaging material and packaging techniques play significant role to be ease of mass production as well. While some manufacturers like “Wirebonding” packaging, some like “Through Via”, and “Ball Grid Array” is the packaging choice of some manufacturers. Component vendors need to have capability to change component design space, as the system designers' demand for their choice of footprint and packaging environment. Moreover, these stringent mechanical specifications cannot compromise the electrical specification. To realize the effect of different packaging technique, we extensively studied several packaging techniques for Bessel filters with −3dB cutoff frequencies of 7 GHz to 10 GHz. We explored “stud bump ball grid array”, “wirebonding”, and “land grid array” footprint packaging. We modeled different packaging technique and incorporated that into simulation to design the filter. We successfully manufacture surface mount filters with three different footprint packaging. We explored the influence of each packaging technique for electrical performance. We studied the hidden parasitic introduction from each packaging style and the detrimental effect of these to electrical performance, especially for frequency of 7 GHz to 10 GHz. We showed the advantages and disadvantages of all three kind of packaging technology in respect of electrical as well as mechanical specification.
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Терпугов, Даниил, Daniil Terpugov, Н. Акинин, N. Akinin, А. Монахов, and A. Monahov. "Carbon Dioxide Trapping by Alkaline Solutions in Tube Absorber." Safety in Technosphere 6, no. 6 (May 23, 2018): 20–24. http://dx.doi.org/10.12737/article_5af01a5bc18460.05645089.

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Commercially gas emission purification at thermoelectric power stations, ferrous and non-ferrous metallurgy enterprises, and cement and chemical plants is performed by multistage system with filters and cyclones, which trap solid particles, as well as by using different absorptive and adsorptive methods. A possibility of use a tubular absorption column for carbon dioxide trapping is considered in this work.
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Dissertations / Theses on the topic "Absorptive filters"

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Stander, Tinus. "High-power broadband absorptive waveguide filters." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/1157.

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Thesis (PhD (Electrical and Electronic Engineering))--University of Stellenbosch.
ENGLISH ABSTRACT: This dissertation presents a synthesis method for broadband high-power absorptive microwave lters by cascading a wide stop-band wa e-iron lter with an absorptive harmonic pad. The classical image impedance synthesis methods for wa e-iron lters are updated to allow for non-uniform boss patterns, which enable control over both the stop-band attenuation and pass-band re ection of the lter. By optimising an accurate circuit model equivalent, computationally intensive numerical EM optimisation are avoided. The nonuniform wa e-iron lter achieves the same electrical speci cation as similar lters in literature, but in a smaller form factor. The prototype presented displays less than -21 dB in-band re ection over 8.5 - 10.5 GHz, with stop-band attenuation in excess of 50 dB over the harmonic bands 17 - 31.5 GHz and 30 dB over the 34 - 42 GHz. The prototype is designed to handling 4 kW peak power incident in the transmitted band, and is 130 mm in length. Minimal full-wave tuning is required post-synthesis, and good agreement is found between synthesised and measured responses. Additionally, a completely novel oblique wa e-iron boss pattern is proposed. For the absorptive harmonic pad, transversal broadwall slots in rectangular waveguide, coupling to an absorptive auxiliary guide, are investigated in the presence of standing wave surface current distributions. An accurate circuit model description of the cascaded structure is developed, and optimised to provide a required level of input match in the presence of an arbitrary re ective lter. Using numerical port parameter data of the wa eiron lter, a harmonic pad is developed that provides -12.5 dB input re ection match across the band 17 - 21 GHz with up to 1 kW peak incident power handling capability, yet is only 33 mm in length. Again, good agreement is found between synthesised and measured responses of the cascaded structure.
AFRIKAANSE OPSOMMING: Hierdie proefskrif stel 'n sintesetegniek voor vir wyeband, ho edrywing absorberende mikrogol lters deur 'n kaskade kombinasie van 'n verlieslose wafelyster lter met 'n wye stopband, en 'n absorberende harmoniekdemper. Die klassieke sintesemetodes vir wafelyster lters word aangepas om nie-uniforme tandpatrone toe te laat, wat beheer oor beide die lter se stopband attenuasie en deurlaatband weerkaatsing moontlik maak. Deur die optimering van 'n akkurate stroombaanmodel van die lter kan berekeningsintensiewe numeriese EM optimering vermy word. Die nieuniforme wafelyster lter behaal dieselfde spesi kasies as soortgelyke gepubliseerde lters, maar is meer kompak. Die vervaardigingsprototipe handhaaf minder as -21 dB intreeweerkaatsing oor die deurlaatband van 8.5 - 10.5 GHz, asook attenuasie van meer as 50 dB oor die stopband 17 - 31.5 GHz en 30 dB oor 34 - 42 GHz. Die prototipe is ontwerp om 4 kW intree kruindrywing te hanteer in die deurlaatband, en is 130 mm lank. Die metode vereis minimale verstellings tydens volgolf simulasie, en die meetresultate stem goed ooreen met die gesintetiseerde gedrag. 'n Nuwe skuinstandpatroon word ook voorgestel vir wafelyster lters. Vir die harmoniekdemper word transversale bre ewandgleuwe in reghoekige gol eier wat koppel na 'n absorberende newegol eier ondersoek in die teenwoordigheid van staandegolfpatrone in oppervlakstroom. 'n Akkurate stroombaanmodel van 'n gleufkaskade word ontwikkel, en geoptimeer om 'n vereiste intreeweerkaatsing te bewerkstellig in samewerking met 'n arbitr^ere weerkaatsende lter. Deur gebruik te maak van poortparameterdata van die wafelyster lter word 'n 33 mm lange hamoniekdemper ontwikkel wat 'n maksimum intreeweerkaatsing van -12.5 dB oor die band 17 - 21 GHz handhaaf vir kruindrywingsvlakke van tot 1 kW. Goeie ooreenstemming tussen gesintetiseerde en gemete resultate word weereens waargeneem vir die volledige saamgestelde struktuur.
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Ben, Reddad Khalid. "Absorption percutanée et métabolisme de filtres solaires." Paris 11, 1994. http://www.theses.fr/1994PA11XXXX.

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Katskov, DA. "Graphite filter atomizer in atomic absorption spectrometry." Elsevier, 2006. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000798.

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Graphite filter atomizers (GFA) for electrothermal atomic absorption spectrometry (ETAAS) show substantial advantages over commonly employed electrothermal vaporizers and atomizers, tube and platform furnaces, for direct determination of high and medium volatility elements in matrices associated with strong spectral and chemical interferences. Two factors provide lower limits of detection and shorter determination cycles with the GFA: the vaporization area in the GFA is separated from the absorption volume by a porous graphite partition; the sample is distributed over a large surface of a collector in the vaporization area. These factors convert the GFA into an efficient chemical reactor. The research concerning the GFA concept, technique and analytical methodology, carried out mainly in the author's laboratory in Russia and South Africa, is reviewed. Examples of analytical applications of the GFA in AAS for analysis of organic liquids and slurries, bio-samples and food products are given. Future prospects for the GFA are discussed in connection with analyses by fast multi-element AAS.
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Thompson, Timothy V. "Solid-state NMR studies of absorption onto activated carbon." Thesis, Durham University, 1995. http://etheses.dur.ac.uk/5228/.

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This is a study of adsorption on three activated carbon substrates using solid- state NMR. The adsorbates used as probe molecules included a range of phosphates, phosphonates and deuterated water. High-resolution (^31)p and (^2)H NMR spectra have been obtained using magic-angle spinning and a single-pulse regime. The deuterium results include the generation of an adsorption isotherm. The traditional gravimetric analysis and NMR experiments were run concurrently. These results showed that the NMR technique was qualitatively and quantitatively accurate, while the proven adsorption isotherm theory could be applied to the NMR results. The additional information given by the (^2)H NMR results showed evidence of two distinct adsorption sites. Initial adsorption in the micropores gives a peak shifted by 6 ppm to low frequency of the liquid (^2)H(_2)O. This peak was broadened due to restricted motion in the micropores. The second peak was observed only at high relative humidities and was attributed to adsorption on the external surface or in macropores. The chemical shift was similar to that of the pure liquid. The (^31)p NMR results were used to directly observe the adsorption of phosphates with a range of molecular sizes. The NMR data were used to calculate the micropore accessibility for each phosphate. Differences in the adsorption mechanism were recorded, and direct comparison for each carbon gave some structural information. It was possible to follow competition reactions over time periods of 1 min to 24 hours. A battlefield simulation was studied, with (^2)H(_2)O and a phosphate competing for the adsorption sites. The NMR results showed that the phosphate was preferentially adsorbed into the micropores, displacing the (^2)H(_2)O However, the addition of (^2)H(_2)O to a carbon saturated with a phosphate enabled more phosphate to be adsorbed into the micropores via a cooperative mechanism. Measurements of the transverse relaxation for adsorbed molecules suggest that the broad micropore signal consists of some overlapping peaks. The peaks width similar chemical shift are attributed to adsorption in pores with differing dimensions. The natural linewidth involves broadening caused by restricted anisotropic motion within the micropores.
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Shehata, Hussein A. H. "HVAC systems using flexible fibre impeller fans." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297764.

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Ngobeni, P., C. Canario, DA Katskov, and Y. Thomassen. "Transverse heated filter atomizer: atomic absorption determination of Pb and Cd in urine." Journal of Analytical Atomic Spectroscopy, 2003. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000894.

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A transverse heated filter atomizer (THFA) was applied to the direct determination of Cd and Pb in urine, and its analytical performances were investigated using a PerkinElmer SIMAA 6000 atomic absorption spectrometer. Seronorm certified human urine reference materials and six realistic samples collected locally were used for the method validation. The urines were diluted ten- or five-fold with 0.2% HNO3. Cd and Pb nitrate solutions were employed as standards. Recoveries of the elements from the urine samples were investigated with the analyte addition method. Compared to the transverse heated graphite atomizer (THGA) with a platform, the THFA provided a significant reduction of spectral background and chemical interferences from the urine matrix, without the use of chemical matrix modifiers, a 1.5–2 times increase of the determination sensitivity and, therefore, a reduction of limits of detection up to 0.018 and 0.2 mg L21 for Cd and Pb, respectively. The use of a THFA collector made from carbon fiber and a tungsten wire improved recoveries of lead and cadmium in urine (¢92%). A sampling temperature 150 uC enabled us to skip the drying period, thus a significantly reduced temperature program was obtained. The accuracies of the measurements of Cd and Pb in the Seronorm urine materials were in good agreement with the recommended values: 4.1 ¡ 0.1 mg L21 of Cd (recommended 5) and 92 ¡ 1 mg L21 of Pb (recommended 85). The lifetime of the THFA for Pb determination was longer than 700 firings, with the sensitivity loss not more than 25% after 500 firings.
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Huong, Srei Pisei. "Etude de la photostabilité et de l'absorption cutanée des filtres solaires." Aix-Marseille 2, 2008. http://www.theses.fr/2008AIX22955.

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Les produits de protection solaire font partie de l’arsenal nécessaire pour une protection indispensable contre les méfaits des rayonnements UV. Toutefois malgré leurs caractères indispensables, des risques potentiels existent : une photoinstabilité des filtres, avec la présence possible des produits de dégradation, une irrégularité de l’épaisseur du film protecteur appliqué induisant une protection diminuée, un passage de la barrière cutanée par les filtres ou par leurs produits de dégradation, une mauvaise utilisation du produit par le consommateur. La photoréactivité de deux filtres solaires éthylhexyl p-méthoxy cinnamate (OMC) et butylméthoxydibenzoylméthane (BMDBM ou DBM) ont été étudié dans différentes conditions, (i) en volume à l'aide de solutions diluées dans des solvants de polarité variable, (ii) en couche mince à l'aide de solutions concentrées dans des solvants nonvolatils et (iii) dans des produits solaires commerciaux. Pour l’OMC, la caractéristique spectroscopique de l’isomère Z a été déterminée, avec son facteur de réponse obtenue par Chromatographie Liquide à Haute Performance. Le rapport des deux isomères E et Z a été mesuré dans chaque état d'irradiation. L'incidence de la photoisomérisation sur le facteur de protection solaire (FPS) a été évaluée sur la base des calculs déduits du concept du film irrégulier. La diminution du FPS, qui peut excéder 30 %, dépend principalement du taux d'isomérisation de l’OMC mais également de la composition des produits de protection solaire. Puisque l'isomérisation de l’OMC est rapide et imprévisible, il est impossible d'obtenir une bonne corrélation entre les mesures du FPS in vivo et in vitro, si les mesures in vitro ne sont pas précédées du processus d'irradiation entraînant l'isomérisation de l'OMC. Pour le DBM, nous avons trouvé que sa sensibilité à la lumière dépend des conditions expérimentales. DBM est stable dans un solvant polaire tel que l'alcool, tandis que dans un solvant non polaire (Hexane), DBM subit un déplacement réversible de l’équilibre tautomérique. Ce phénomène inattendu est inhibé par une modification minime de la polarité du solvant. Les produits de photodégradations ont analysés par chromatographie liquide - spectromètre de masse (CLHP-SM), pour pouvoir les identifier, en détectant leurs masses moléculaires. L'incidence de la photodégradation sur la valeur du FPS a été mesurée. Les travaux sur la photoréactivité des filtres solaires OMC et DBM ont été publiés dans une revue internationale. L’étude in vitro du passage transdermique des filtres solaires et de leurs produits de dégradation est effectuée sur la peau de l’oreille de porc installée sur des cellules de diffusion. Elle démontre que l’absorption cutanée de ces deux filtres est très faible
The sunscreen product belongs to the arsenal necessary for an essential protection against the harmful effect of UV radiations. Although their essential character, the potential risks exist: a photoinstability of the filters, with the possible presence of the breakdown products (photodegradation product), an irregularity thickness of protective film applied inducing a decreased protection, a passage of the cutaneous barrier by the filters or their breakdown products, a misuse of the product by the consumer. The photoisomerization of two sun filter ethylhexyl p-methoxycinnamate (OMC) and butylmethoxydibenzoylmethane (BMDBM or DBM) were studied under various conditions, (i) by irradiating diluted solutions using various solvents, (ii) by irradiating thin layers of concentrated solutions in non-volatile solvents, and (iii) by irradiating thinly applied commercial sunscreen products. The spectroscopic characteristics of the Z isomer were determined, along with its response factor in HPLC analysis. The ratio of the two isomers E and Z was measured under each condition of irradiation. The incidence of photoisomerization in the sun protection factor (SPF) was evaluated on the basis of calculations deduced from the concept of irregular film developed by O’Neill. The decrease in SPF, which can exceed 30%, is primarily dependent upon the rate of isomerization of OMC but also on the composition of sunscreen products. As isomerization of OMC is rapid and its rate unpredictable, it is in theory impossible to obtain good correlation between measurements of SPF in vivo and those in vitro, if measurements in vitro are not preceded by the process of irradiation precipitating isomerization of OMC. The behaviour of DBM clearly showed that its sensitivity to light is dependent on experimental conditions. DBM is stable in a polar solvent such as alcohol, whereas in a non-polar solvent (Hexane), DBM is undergoing a reversible displacement of tautomeric equilibrium. This unexpected phenomenon is inhibited by a very small modification of polarity. The photodegradation products were detected using liquid chromatography–mass spectrometer (LC/MS), to detect their molecular masses and thus obtain a broad idea of their identity. The incidence of photodegradation on the SPF value was measured. The studies of photoreactivity of the sun filters OMC and DBM has been published in an international journal. The in vitro transdermal penetration study of the UV filters and their breakdown products will be carried out on the skin of the pig’s ear installed on diffusion cell. The results show that the cutaneous absorption of the two filters is very low
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Lemaitre-Aghazarian, Virginie. "Etude "in vitro" sur cellules de diffusion du passage transdermique et/ou transmembranaire des filtres solaires et rétinoi͏̈des." Aix-Marseille 2, 1996. http://www.theses.fr/1996AIX22534.

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Mohammedi, Mourad. "Etude de matériaux de garnissage en vue d'une réduction géométrique des filtres biologiques dans le cadre de l'assainissement autonome." Limoges, 1998. http://www.theses.fr/1998LIMO0024.

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L'objectif de ce travail est d'observer le comportement de materiaux filtrants tres differents vis-a-vis de criteres dont depend la qualite d'une epuration biologique. Les criteres retenus sont l'hydrodynamique du filtre insature, la capacite d'aeration des massifs, ainsi que leur aptitude a eliminer les matieres en suspension. Les materiaux les mieux adaptes pour une reduction geometrique des filtres biologiques utilises en assainissement autonome sont recherches. L'etude hydrodynamique des materiaux repose sur la determination de leur capacite de retention de l'eau et les temps de sejour moyens dans le filtre. Une methode systemique a ete developpee et permet de caracteriser la quantite totale d'eau mise en jeu dans un massif filtrant. La caracterisation des massifs suivant leur capacite d'aeration consiste a calculer les constantes de transfert propres a chacun des materiaux. Des modeles traduisant l'evolution des concentrations en oxygene dissous en fonction de la charge appliquee et de la hauteur du massif sont proposes. L'aptitude des massifs a eliminer (retention mecanique-hydrolyse) les matieres en suspension a ete etudiee en utilisant des particules synthetiques (amidon insoluble de pomme de terre). Une etude du mecanisme de capture est effectuee sur deux materiaux distincts (sable et sepiolite) et un modele de filtration en profondeur est applique. Il faut noter que les conditions operatoires retenues s'ecartent de celles rencontrees dans la litterature. Un modele general couplant la retention mecanique et la degradation biologique est propose et des simulations numeriques sont presentees. Ces calculs ont ete effectues en utilisant des constantes cinetiques d'hydrolyse des particules determinees experimentalement. Ces diverses etudes ont permis de selectionner la sepiolite et les deux zeolithes (clinomin et chabamin). L'epuration biologique d'un effluent septique menee sur ces materiaux revele d'excellents rendements epuratoires pour une charge de 5 cm. J#-#1. Une elevation de la charge hydraulique est pratiquee (25 cm. J#-#1) et montre que de bonnes performances epuratoires sont conservees, ce qui laisse presager qu'une reduction geometrique des filtres garnis de ces materiaux est possible.
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Allegrini, Charles. "Etude par spectroscopie infrarouge à transformée de Fourier de l'adsorption de gaz sur filtres à charbon actif." Aix-Marseille 3, 1993. http://www.theses.fr/1993AIX30040.

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L'efficacite d'un systeme d'epuration d'air, deja existant et operant en milieu confine, a ete testee. Ce systeme qui utilise des filtres a charbon actif, doit fonctionner avec une vitesse de passage de l'air pollue particulierement elevee. Les polluants etudies sont co (1500 ppm), so2 (100 ppm), no2 (50 ppm) et hcl (500 ppm). Un nouvel appareillage capable de generer des atmospheres polluees de facon dynamique a ete mis au point et une methode quantitative basee sur la spectroscopie irtf est decrite. De nombreuses courbes de percee experimentales ont pu ainsi etre etablies en tenant compte de differents parametres comme la masse et la granulometrie du charbon actif et la section des filtres. Dans un second temps, nous avons modelise ces differentes courbes de percee. Cette modelisation nous a montre que le charbon actif n'etait pas sature dans les conditions d'analyse et nous a permis de determiner dans un temps relativement court, les equations generales de la cinetique d'adsorption des polluants et les quantites de polluants adsorbes (capacites d'adsorption). En resume, cette etude a permis d'optimiser le fonctionnement du systeme d'epuration d'air
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Books on the topic "Absorptive filters"

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Program, Canada Centre For Mineral and Energy Technology Mineral Research. On Filter Self-Absorption and Loading Characteristics. S.l: s.n, 1985.

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González, Zacarías León. Percutaneous Absorption of UV Filters Contained in Sunscreen Cosmetic Products. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-01189-9.

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González, Zacarías León. Percutaneous Absorption of UV Filters Contained in Sunscreen Cosmetic Products: Development of Analytical Methods. Springer, 2013.

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González, Zacarías León León. Percutaneous Absorption of UV Filters Contained in Sunscreen Cosmetic Products: Development of Analytical Methods. Springer, 2016.

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Improvement in suppression of pulsed Nd: YAG laser light with iodine absorption cells for filtered Rayleigh scattering measurements. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1997.

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Ellison, David H., and Arohan R. Subramanya. Clinical use of diuretics. Edited by Robert Unwin. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199592548.003.0033.

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Diuretics are widely employed to treat extracellular fluid volume expansion caused by heart failure, cirrhosis of the liver, nephrotic syndrome, and chronic kidney disease. Major classes of diuretic inhibit sodium reabsorption along the proximal tubule, the loop of Henle, the distal convoluted tubule, and the connecting and collecting tubules. Loop diuretics have the highest ceiling of action and often form the cornerstones of diuretic treatment of oedema. Members of this class are short-acting drugs, with different bioavailabilities, the specifics of which contribute importantly to a rational and effective approach to their use. They are not filtered substantially because they are all protein bound. They enter tubules by secretion along the proximal tubule, thereby gaining access to the Na-K-2Cl cotransporter of the thick ascending limb. Their dose–response curves are sigmoidal and altered by several disease processes. Chronic administration can elicit adaptive processes along the nephron that limit their efficacy. Distal convoluted tubule diuretics, such as the thiazides, inhibit NaCl absorption along the distal convoluted tubule. While used predominantly to treat hypertension, they are also useful to treat oedema, especially when combined with loop diuretics. Drugs acting along the connecting tubule and collecting duct either inhibit Na+ channels directly or block mineralocorticoid receptors. These drugs are effective in states of very high aldosterone secretion, and can also be used to reduce the hypokalaemia caused by other classes of diuretics. An evidence-based approach to treating the oedematous patient is described.
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Book chapters on the topic "Absorptive filters"

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Mecchia, Marco, Cecilia Pretorius, Peter Stacey, Markus Mattenklott, and Emma Incocciati. "X-Ray Absorption Effect in Aerosol Samples Collected on Filter Media." In Silica and Associated Respirable Mineral Particles, 139–68. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2013. http://dx.doi.org/10.1520/stp156520130035.

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Li, Suixian, and Liyan Zhang. "Optimal Sensitivity Design of Multispectral Camera Via Broadband Absorption Filters Based on Compressed Sensing." In Springer Proceedings in Physics, 329–39. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49184-4_33.

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León González, Zacarías. "Development of a Chromatographic Method to Estimate the In Vitro Percutaneous Absorption of Hydrosoluble UV Filters." In Springer Theses, 37–55. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01189-9_2.

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Yo-Shen Lin and Jhih-Ying Shao. "Absorptive planar bandstop filters." In Advances in Planar Filters Design, 177–218. Institution of Engineering and Technology, 2019. http://dx.doi.org/10.1049/sbew535e_ch7.

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Lee, Tae-Hak, Sang-Gyu Lee, Jean-Jacques Laurin, and Ke Wu. "Reconfigurable Filter Design." In Adaptive Filtering - Recent Advances and Practical Implementation [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97446.

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This chapter discusses recent development of reconfigurable filters. The technical terminology reconfigurable means that a circuit is designed in a way to have various electrical characteristics comparing with one which has a static feature. For the filter design, the various electrical characteristics can be considered as the filter can tune its operating frequency, bandwidth, and/or have multiple operational modes, that is, bandstop or bandpass modes. Also, recently, the filters that can exhibit an improved impedance matching performance over its stopband have been reported. It provides more options for the filter designers to realize the reconfigurable filters having reflective and/or absorptive frequency response types to satisfy a prior given requirement. In this chapter, recently devised filter designs will be covered and essential frequency tuning elements to realize the reconfigurable characteristic will be introduced as well.
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Verma, Karunendra Kumar, V. M. Mishra, and Niraj Kumar. "Application of Novel Techniques in Active Power Filter." In Applications of Artificial Intelligence in Electrical Engineering, 158–91. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-2718-4.ch010.

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Traditionally, the major part of the electrical power is generally consumed by the non-linear loads due to frequent application of the semiconductor devices in the form of domestic and industrial loads. This results from distortion in the actual supply voltage waveform at the source end due to the interference of the multiple harmonics generated out of semiconductor devices used at load end and excessive absorption of the reactive power. The insufficiency of these compensation techniques leads to the advent of the phase multiplication techniques as well as the most reliable and economic active power filtering scheme. A deep analysis showing tedious waveforms using the ORCAD simulation package for the various kind of loads in conjunction with the single-phase active power filter shunted to the single-phase line at the load end for the two current control techniques (i.e., hysteresis band current control, triangularization of current control) has been done. The results are analyzed and tested to lead the optimistic approach for APF (active power filters).
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Raniero, Walter, Gianantonio Della Mea, and Matteo Campostrini. "Functionalization of Surfaces with Optical Coatings Produced by PVD Magnetron Sputtering." In Research Perspectives on Functional Micro- and Nanoscale Coatings, 170–207. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-5225-0066-7.ch007.

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This chapter describes the functionalization of the surface of the glass through thin film inorganic coatings. Such filters called dichroic filters, following the physical principle of interference of light using the rules of optical physics. The design of the optical multilayer materials with high and low refractive index and optimizing the predetermined optical responses. The AFM quantify the real thickness and, calibrate the deposition plant, using as an input data for the simulation to evaluate the dispersion index refraction and absorption. The dichroic filters separate the incident radiation into two or more predetermined optical bands. The materials used are deposited using PVD Reactive Magnetron Sputtering, allows to increase the deposition rate, to obtain good homogeneity range of the surface deposited. The set point of deposition which allows to obtain stoichiometric oxides is analyzed with the technique RBS. These optical filters, also called dichroic are applied in the research field of the splitting photovoltaic concentration.
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Shelby, J. E. "OPTICAL MATERIALS | Color Filter and Absorption Glasses." In Encyclopedia of Modern Optics, 440–46. Elsevier, 2005. http://dx.doi.org/10.1016/b0-12-369395-0/00871-x.

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Taylor, Nic. "Modeling Atmospheric Absorption with a Low-Pass Filter." In Game Audio Programming 3, 51–68. CRC Press, 2020. http://dx.doi.org/10.1201/9780429331251-5.

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Lodge, James P. "General Atomic Absorption Procedure for Trace Metals in Airborne Material Collected on Filters." In Methods of Air Sampling and Analysis, 608–18. Routledge, 2017. http://dx.doi.org/10.1201/9780203747407-122.

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Conference papers on the topic "Absorptive filters"

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Maljutin, N. D., A. G. Loschilov, and A. A. Ladur. "Circuits of combined absorptive filters." In Telecommunication Technology" (CriMiCo 2008). IEEE, 2008. http://dx.doi.org/10.1109/crmico.2008.4676470.

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Rankowski, J. F. "Absorptive bandpass filters for NVIS-compatible crewstations." In Optical Engineering Midwest '95. SPIE, 1995. http://dx.doi.org/10.1117/12.216822.

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Lebl, A., M. Mileusni, B. Pavic, and J. Radivojevic. "Absorptive Filters in the Realization of RCIED Activation Jamming." In 2019 IEEE 31st International Conference on Microelectronics (MIEL). IEEE, 2019. http://dx.doi.org/10.1109/miel.2019.8889582.

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Psychogiou, Dimitra, Ruiyi Mao, and Dimitrios Peroulis. "Series-cascaded absorptive notch-filters for 4G-LTE radios." In 2015 IEEE Radio and Wireless Symposium (RWS). IEEE, 2015. http://dx.doi.org/10.1109/rws.2015.7129726.

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Psychogiou, Dimitra, Roberto Gomez-Garcia, and Dimitrios Peroulis. "RF-design of narrowband absorptive bandstop filters for UHF applications." In 2015 IEEE 16th Annual Wireless and Microwave Technology Conference (WAMICON). IEEE, 2015. http://dx.doi.org/10.1109/wamicon.2015.7120362.

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Psychogiou, Dimitra, and Roberto Gomez-Garcia. "Substrate-Integrated Coaxial Bandpass Filters With Symmetrical Quasi-Absorptive Response." In 2020 XXXIIIrd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS). IEEE, 2020. http://dx.doi.org/10.23919/ursigass49373.2020.9232162.

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Psychogiou, Dimitra, and Roberto Gomez-Garcia. "Quasi-Absorptive Substrate-Integrated Bandpass Filters Using Capacitively-Loaded Coaxial Resonators." In 2020 IEEE/MTT-S International Microwave Symposium (IMS). IEEE, 2020. http://dx.doi.org/10.1109/ims30576.2020.9223880.

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Chieh, Jia-Chi Samuel, and Jason Rowland. "X-band frequency selective limiter using absorptive notch filters embedded multiplexers." In 2017 IEEE/MTT-S International Microwave Symposium - IMS 2017. IEEE, 2017. http://dx.doi.org/10.1109/mwsym.2017.8059035.

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Psychogiou, Dimitra, Roberto Gomez-Garcia, Derek Scarbrough, Charles L. Goldsmith, and Dimitrios Peroulis. "Design of high-Q absorptive bandstop filters with static and reconfigurable attenuation." In 2015 IEEE MTT-S International Microwave Symposium (IMS2015). IEEE, 2015. http://dx.doi.org/10.1109/mwsym.2015.7166860.

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Guyette, Andrew C., Ian C. Hunter, and Roger D. Pollard. "Design of absorptive microwave filters using allpass networks in a parallel-cascade configuration." In 2009 IEEE MTT-S International Microwave Symposium Digest (MTT). IEEE, 2009. http://dx.doi.org/10.1109/mwsym.2009.5165801.

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Reports on the topic "Absorptive filters"

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Lemire, Guy. Absorptive Reflectionless Filters. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.7375.

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Dickens, Brian, and Eric Byrd. Programs to Estimate UV Dosage and Damage. National Institute of Standards and Technology, September 1999. http://dx.doi.org/10.6028/nist.ir.7500.

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The system of programs described in this paper is concerned with estimating the damage ensuing from exposure of specimens in dry and humid atmospheres to UV and visible radiation covering the solar range. Damage is monitored quantitatively by changes in IR spectra. The dose is estimated from UV spectra of the lamps and the interference filters (used to isolate a particular wavelength range). The dosage is estimated from the dose and the UV absorption of the specimens themselves. These programs allow rapid estimation of dosage and damage from regions of data, and manipulation and processing of the massive amounts of data required to carry out such comprehensive tests in a complete yet user-friendly manner.
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Barnett, J. Matthew, Valerie I. Cullinan, Debra S. Barnett, Truc LT Trang-Le, Mary Bliss, Lawrence R. Greenwood, and Marcel Y. Ballinger. Results of Self-Absorption Study on the Versapor 3000 Filters for Radioactive Particulate Air Sampling. Office of Scientific and Technical Information (OSTI), February 2009. http://dx.doi.org/10.2172/949086.

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Barnett, J. Matthew. Results of Self-Absorption Study on the Versapor 3000 Filters for Radioactive Particulate Air Sampling. Office of Scientific and Technical Information (OSTI), August 2008. http://dx.doi.org/10.2172/949137.

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Smith, Brian M., J. Matthew Barnett, and Marcel Y. Ballinger. Assessment of the Losses Due to Self Absorption by Mass Loading on Radioactive Particulate Air Stack Sample Filters. Office of Scientific and Technical Information (OSTI), January 2011. http://dx.doi.org/10.2172/1004502.

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Edwards, Hunter, and John Barnett. Collective Analysis of Alpha Particle Losses Due to Self-Absorption by Mass Loading on Radioactive Particulate Glass Fiber Filters. Office of Scientific and Technical Information (OSTI), February 2021. http://dx.doi.org/10.2172/1765838.

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