Relevant bibliographies by topics / Differential filtration

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Differential filtration'

Author: Grafiati
Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Differential filtration"

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Geiss, Hans C., Parhofer, Donner, and Schwandt. "Low Density Lipoprotein Apheresis by Membrane Differential Filtration (Cascade Filtration)." Therapeutic Apheresis 3, no. 3 (August 1999): 199–202. http://dx.doi.org/10.1046/j.1526-0968.1999.00157.x.

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von Baeyer, Hans, Frank Kochinke, Ingo Schwaner, Rainer Schwerdtfeger, and Wolfgang Schwarztkopff. "Fundamentals and application of differential filtration." Plasma Therapy and Transfusion Technology 8, no. 4 (December 1987): 273–82. http://dx.doi.org/10.1016/s0278-6222(87)80031-1.

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Nagase, Youichi, and Kenji Okada. "Experimental Verification of Governing Differential Equation for Filtration-Constant Pressure Cake Filtration-." Journal of the Society of Powder Technology, Japan 40, no. 11 (2003): 786–94. http://dx.doi.org/10.4164/sptj.40.786.

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Khodagholi, Mohammad, Mohammad Hemmati, and Ali Pour. "Efficient filtration system for paraffin-catalyst slurry separation." Chemical Industry and Chemical Engineering Quarterly 19, no. 2 (2013): 295–301. http://dx.doi.org/10.2298/ciceq120226063k.

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The filtration efficiency for separating liquid paraffin (or water) from a slurry consisting of 25 weight% spherical alumina in a Slurry Bubble Column Reactor (SBCR) comprised of a cylindrical tube of 10 cm diameter and 150 cm length was studied. Various differential pressures (?P) were applied to two separate tubular sintered metal stainless steel filter elements with nominal pore size of 4 and 16?m. The experimental results disclosed that the rate of filtrations increased on applying higher differential pressure to the filter element. Albeit this phenomenon is limited to moderate ?Ps and for ?P more than 1 bar is neither harmful nor helpful. The highest filtration rates at ?Ps higher than 1 bar were 170 and 248 ml/minute for 4 and 16?m respectively. Using water as the liquid in slurry the rate of filtration enhanced to 4 folds, and this issue reveals impact of viscosity on filtration efficiency clearly. In all situations, the total amount of particles present in the filtrate part never exceeded a few parts per million (ppm). The statistical analysis of the SEM image of the filtrate indicated that by applying higher pressure difference to the filter element the frequency percent of larger particle size increases. The operation of filter cake removing was performed with back flashing of 300 ml of clean liquid with pressures of 3-5 bar of N2 gas.
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Svalov, A. M. "Bottom-hole filtration at a positive differential pressure." Soviet Mining Science 25, no. 1 (January 1989): 56–60. http://dx.doi.org/10.1007/bf02528431.

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Atamanyuk, Volodymyr, and Yaroslav Gumnytskyi. "Mass Exchange Dynamics During the Second Filtration Drying Period." Chemistry & Chemical Technology 3, no. 2 (June 15, 2009): 129–37. http://dx.doi.org/10.23939/chcht03.02.129.

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The work is dedicated to theoretical and experimental investigations of kinetics and dynamics of filtration drying of capillary and pore materials, and mineral granulated fertilizers, in particular. The proposed physical model of a moist particle and the differential system of equations which describes heat exchange in the second drying period enables to determine the transfer velocity of mass-exchange zone in a dispersion layer of the material during filtration drying.
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Biswas, Indranil. "Differential operators and flat connections on a Riemann surface." International Journal of Mathematics and Mathematical Sciences 2003, no. 64 (2003): 4041–56. http://dx.doi.org/10.1155/s0161171203212187.

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We consider filtered holomorphic vector bundles on a compact Riemann surfaceXequipped with a holomorphic connection satisfying a certain transversality condition with respect to the filtration. IfQis a stable vector bundle of rankrand degree(1−genus(X))nr, then any holomorphic connection on the jet bundleJn(Q)satisfies this transversality condition for the natural filtration ofJn(Q)defined by projections to lower-order jets. The vector bundleJn(Q)admits holomorphic connection. The main result is the construction of a bijective correspondence between the space of all equivalence classes of holomorphic vector bundles onXwith a filtration of lengthntogether with a holomorphic connection satisfying the transversality condition and the space of all isomorphism classes of holomorphic differential operators of ordernwhose symbol is the identity map.
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Bierck, B. R., and R. I. Dick. "In Situ Examination of Effects of Pressure Differential on Compressible Cake Filtration." Water Science and Technology 22, no. 12 (December 1, 1990): 125–34. http://dx.doi.org/10.2166/wst.1990.0107.

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A synchrotron X-ray absorbance technique was used to monitor suspended solids concentration changes in compressible filter cakes formed at different constant pressure differentials. Results for a kaolin slurry and an activated sludge manifested the markedly higher compressibility of the latter sludge. A model developed to describe effects of pressure differential on filtrate production behavior of an ideal compressible slurry indicated that the kaolin slurry behaved as such. However, the activated sludge was not ideal because changes in pressure differential did not cause the idealized change in filtrate production rate. A thin skin of activated sludge solids at the filter medium accounted for the non-ideal compressive behavior. Porewater pressure data acquired 0.86 mm above the filter medium during activated sludge filtration provided evidence of skin formation and its effect - virtually the total pressure drop occurred within this 0.86 mm region throughout cake formation (after which shrinkage began). Hence, significant effective stresses required to consolidate the sludge cake did not develop in most of the cake until cake formation was complete and shrinkage began.
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Manolakos, Spiros, Francy Sinatra, Leila Albers, Kevin Hufford, James Alberti, Erkinjon Nazarov, and Theresa Evans-Nguyen. "Differential Mobility Spectrometry for Inorganic Filtration in Nuclear Forensics." Analytical Chemistry 88, no. 23 (November 7, 2016): 11399–405. http://dx.doi.org/10.1021/acs.analchem.6b01441.

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Ohkubo, Shun. "Logarithmic growth filtrations for -modules over the bounded Robba ring." Compositio Mathematica 157, no. 6 (June 2021): 1265–301. http://dx.doi.org/10.1112/s0010437x21007107.

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In the 1970s, Dwork defined the logarithmic growth (log-growth for short) filtrations for $p$-adic differential equations $Dx=0$ on the $p$-adic open unit disc $|t|<1$, which measure the asymptotic behavior of solutions $x$ as $|t|\to 1^{-}$. Then, Dwork calculated the log-growth filtration for $p$-adic Gaussian hypergeometric differential equation. In the late 2000s, Chiarellotto and Tsuzuki proposed a fundamental conjecture on the log-growth filtrations for $(\varphi ,\nabla )$-modules over $K[\![t]\!]_0$, which can be regarded as a generalization of Dwork's calculation. In this paper, we prove a generalization of the conjecture to $(\varphi ,\nabla )$-modules over the bounded Robba ring. As an application, we prove a generalization of Dwork's conjecture proposed by Chiarellotto and Tsuzuki on the specialization property for log-growth Newton polygons.
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Dissertations / Theses on the topic "Differential filtration"

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Roselli, Marco. "Surgical masks: analysis of their performances and possible solutions for their reusability." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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As a consequence of the high virus spreading capability, the COVID-19 outbreak has led to an uncontrolled situation. Several mask types can be used to limit virus diffusion; however, the present project focuses on surgical masks only. This type of masks, regulated by the EN14683:2019 normative, is intended to be a disposable device with the aim of blocking droplets exiting the wearer's mouth and nose and, further, protecting the wearer from external splashes. The starting point of this project is to investigate the mask reusability; this is a crucial issue because the environmental impact caused by disposable masks is gaining increasing importance. To begin with, the study has focused on the evaluation of how the masks' performances vary over time and, it has proceeded with tests (long-run tests) aimed at evaluating their parameters, the differential pressure and the bacterial filtration efficiency, in two types of situations: an intense and prolonged use and a limited use. The combination of two masks has also been investigated. To find effective regenerating strategies, domestic practices have been investigated, among those the use of alcohol, hand washing and industrial washing. Some tests have been also performed on a surgical mask with an interchangeable filter, in order to verify the effectiveness of the washing procedure. The study has demonstrated that masks behave differently and this mainly depends on the type of filter medium placed inside the structure. Some of them do not exhibit any variation in the investigated parameters, whereas others show a significant decrease only in terms of filtration efficiency. Nevertheless, the reusability can be possible by taking the full advantage of mask performances or by following a proper regenerating method. The mask with interchangeable filter is the most ecofriendly alternative and it has demonstrated to be compliant with the standard requirements even after 25 cycles of industrial washing.
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Bénézet, Cyril. "Study of numerical methods for partial hedging and switching problems with costs uncertainty." Thesis, Université de Paris (2019-....), 2019. http://www.theses.fr/2019UNIP7079.

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Nous apportons dans cette thèse quelques contributions à l’étude théorique et numérique de certains problèmes de contrôle stochastique, ainsi que leurs applications aux mathématiques financières et à la gestion des risques financiers. Ces applications portent sur des problématiques de valorisation et de couverture faibles de produits financiers, ainsi que sur des problématiques réglementaires. Nous proposons des méthodes numériques afin de calculer efficacement ces quantités pour lesquelles il n’existe pas de formule explicite. Enfin, nous étudions les équations différentielles stochastiques rétrogrades liées à de nouveaux problèmes de switching, avec incertitude sur les coûts
In this thesis, we give some contributions to the theoretical and numerical study to some stochastic optimal control problems, and their applications to financial mathematics and risk management. These applications are related to weak pricing and hedging of financial products and to regulation issues. We develop numerical methods in order to compute efficiently these quantities, when no closed formulae are available. We also study backward stochastic differential equations linked to some new switching problems, with costs uncertainty
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Мягкий, Олександр Валерійович. "Підвищення завадостійкості теплової дефектоскопії багатошарових конструкцій та трубопроводів." Thesis, Харківський національний університет радіоелектроніки, 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/40779.

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Дисертаційна робота на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.11.13 – прилади і методи контролю та визначення складу речовини. – Харківський національний університет радіоелектроніки, Харків, 2019. Дисертація присвячена підвищенню завадостійкості теплової дефектоскопії багатошарових стільникових конструкцій і трубопроводів шляхом зниження завад в тепловому неруйнівному контролі як за рахунок вибору режиму контролю за критерієм максимуму відношення сигнал / завада, так і за допомогою подальшої комп'ютерної обробки отриманих експериментальних даних. Запропоновано теплофізичні моделі багатошарових стільникових конструкцій і трубопроводів. Розроблено програмний пакет "TermoPro_TFH_Statistic" і на його основі проведено чисельні експерименти по вибору режимів теплової дефектоскопії. Проведено ряд натурних і лабораторних експериментів з дослідження впливу завад на тепловий неруйнівний контроль. Розроблено ряд фільтрів, а також послідовність їх застосування для істотного зниження рівня завад при проведенні ТДС. Завдяки цьому підвищилась чутливість теплової дефектоскопії до виявлення дефектів типу "непроклей" в стільникових структурах – розмір порогового дефекту знижений з 6 мм до 3 мм, а достовірність їх виявлення зросла на 17-20%.
The dissertation on the receipt of scientific degree of candidate of engineering sciences on speciality 05.11.13 – devices and methods of testing and materials composition determination. Kharkiv National University of Radio Electronics, Kharkiv, 2019. The dissertation is devoted to the question of immunity to interference improvement in the thermal non-destructive testing of multilayered honeycomb constructions and pipelines, both by the monitoring mode selection with the criterion of maximum signal-to-interference ratio, and by the further computer processing of obtained experimental data. Thermophysical models of multilayered honeycomb constructions are proposed. The software package "TermoPro_TFH_Statistic" was worked out and number of experiments at the thermal flaw detection modes selection were performed on its basis. A number of full-size and laboratory-scale experiments were conducted to investigate the interference effect on thermal non-destructive testing. A number of filters have been worked out, as well as the sequence of their use to significantly reduce the interference level during the thermal flaw detection. Due to this, the sensitivity of thermal defectoscopy to detection of defects of the "non-adhesive" type in honeycomb structures increased – the size of the threshold defect was decreased from 6mm to 3mm, and the reliability of their detection increased by 17-20%.
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Мягкий, Олександр Валерійович. "Підвищення завадостійкості теплової дефектоскопії багатошарових конструкцій та трубопроводів." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/40777.

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Дисертаційна робота на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.11.13 - прилади і методи контролю та визначення складу речовини. – Харківський національний університет радіоелектроніки, Харків, 2019. Дисертація присвячена підвищенню завадостійкості теплової дефектоскопії багатошарових стільникових конструкцій і трубопроводів шляхом зниження завад в тепловому неруйнівному контролі як за рахунок вибору режиму контролю за критерієм максимуму відношення сигнал / завада, так і за допомогою подальшої комп'ютерної обробки отриманих експериментальних даних. Запропоновано теплофізичні моделі багатошарових стільникових конструкцій і трубопроводів. Розроблено програмний пакет "TermoPro_TFH_Statistic" і на його основі проведено чисельні експерименти по вибору режимів теплової дефектоскопії. Проведено ряд натурних і лабораторних експериментів з дослідження впливу завад на тепловий неруйнівний контроль. Розроблено ряд фільтрів, а також послідовність їх застосування для істотного зниження рівня завад при проведенні ТДС. Завдяки цьому підвищилась чутливість теплової дефектоскопії до виявлення дефектів типу "непроклей" в стільникових структурах – розмір порогового дефекту знижений з 6 мм до 3 мм, а достовірність їх виявлення зросла на 17 -20%.
The dissertation on the receipt of scientific degree of candidate of engineering sciences on speciality 05.11.13 – devices and methods of testing and materials composition determination. Kharkiv National University of Radio Electronics, Kharkiv, 2019. The dissertation is devoted to the question of immunity to interference improvement in the thermal non-destructive testing of multilayered honeycomb constructions and pipelines, both by the monitoring mode selection with the criterion of maximum signal-to-interference ratio, and by the further computer processing of obtained experimental data. Thermophysical models of multilayered honeycomb constructions are proposed. The software package "TermoPro_TFH_Statistic" was worked out and number of experiments at the thermal flaw detection modes selection were performed on its basis. A number of full-size and laboratory-scale experiments were conducted to investigate the interference effect on thermal non-destructive testing. A number of filters have been worked out, as well as the sequence of their use to significantly reduce the interference level during the thermal flaw detection. Due to this, the sensitivity of thermal defectoscopy to detection of defects of the "non-adhesive" type in honeycomb structures increased – the size of the threshold defect was decreased from 6mm to 3mm, and the reliability of their detection increased by 17-20%.
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Dandapani, Aditi. "Enlargement of Filtration and the Strict Local Martingale Property in Stochastic Differential Equations." Thesis, 2016. https://doi.org/10.7916/D8XW4JZ2.

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In this thesis, we study the strict local martingale property of solutions of various types of stochastic differential equations and the effect of an initial expansion of the filtration on this property. For the models we consider, we either use existing criteria or, in the case where the stochastic differential equation has jumps, develop new criteria that can can detect the presence of the strict local martingale property. We develop deterministic sufficient conditions on the drift and diffusion coefficient of the stochastic process such that an enlargement by initial expansion of the filtration can produce a strict local martingale from a true martingale. We also develop a way of characterizing the martingale property in stochastic volatility models where the local martingale has a general diffusion coefficient.
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Beuger, Abraham L. "The impact of water content and other environmental parameters on toluene removal from air in a differential biofiltration reactor : a thesis submitted in the partial fulfilment of the requirements for the degree of Doctor of Philosophy in Chemical and Process Engineering in the University of Canterbury /." 2008. http://hdl.handle.net/10092/1932.

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Books on the topic "Differential filtration"

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Membrane separations technology: Single-stage, multistage, and differential permeation. Amsterdam: Gulf Professional Pub., 2003.

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Beli͡aev, A. I͡U. Usrednenie v zadachakh teorii filʹtrat͡sii. Moskva: Nauka, 2004.

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Espedal, M. S. Filtration in porous media and industrial application: Lectures given at the 4th session of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Cetraro, Italy, August 24-29, 1998. Edited by Fasano A, Mikelić A, and Centro internazionale matematico estivo. Berlin: Springer, 2000.

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Le Jan, Y. (Yves), 1952- and Li X.-M. (Xue-Mei) 1964-, eds. The geometry of filtering. Basel: Birkhäuser, 2010.

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Espedal, M. S., and A. Mikelic. Filtration in Porous Media and Industrial Application: Lectures given at the 4th Session of the Centro Internazionale Matematico Estivo (C.I.M.E.) held ... Mathematics / Fondazione C.I.M.E., Firenze). Springer, 2001.

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Niaudet, Patrick, and Alain Meyrier. Minimal change disease. Edited by Neil Turner. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199592548.003.0055_update_001.

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Minimal change disease is the most common cause of nephrotic syndrome in childhood but is not rare in adults. The factors altering permeability of the glomerular filtration barrier are not known, but podocyte structure is significantly altered in the condition and it seems certain that this cell is the target of whatever factors are responsible for the condition. It is still not clear that it is immunologically mediated and many of the agents used to treat it have direct effects on the podocyte. The differential diagnosis includes any other disease causing nephrotic syndrome, and a renal biopsy narrows this down. In children, steroid unresponsiveness is often used as a diagnostic test, and consideration of genetic or other pathologies reserved for patients who show no or poor steroid responsiveness.
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Lopez, Berenice, and Patrick J. Twomey. Biochemical investigation of rheumatic diseases. Oxford University Press, 2013. http://dx.doi.org/10.1093/med/9780199642489.003.0062.

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It is important for rheumatologists to have an understanding of biochemical tests including an awareness of their limitations. The biological variability of an analyte both within and between individuals, the limitations of the measurement technology, the sensitivity of laboratory internal quality control and external quality assurance procedures, as well as interlaboratory variations in practices including sample collection procedures, may all impact on the interpretation of a result. Biochemical tests are often requested to monitor organ-specific dysfunction arising as an adverse consequence of pharmacotherapy or as a component of a systemic rheumatic disease, although dysfunction may also reflect infection or coincidental pathology. Patients with rheumatic diseases are at high risk of renal and hepatic disease. Serum creatinine and its derivative estimated glomerular filtration rate (eGFR) are the most readily available surrogate markers of GFR and are used to assess renal impairment and monitor its course. However, the use of creatinine alone lacks sensitivity and a substantial loss of function must occur before creatinine levels are increased. Additional biochemical screening for kidney damage can be performed by assessment of glomerular integrity, including proteinuria or albuminuria and haematuria. A wide spectrum of rheumatic diseases can affect the liver with various degrees of involvement and hepatic pathology. These often present with cholestatic or hepatitic biochemical profiles. The medical management of rheumatic diseases also involves medications that are hepatotoxic, and routine monitoring of liver function is recommended. This approach is not problem-free and may be improved by quantitative determinations of non-invasive markers of liver fibrosis in the future. Together with imaging techniques, biochemical tests play an important role in the assessment and differential diagnosis of metabolic bone disease.
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Book chapters on the topic "Differential filtration"

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Meirmanov, Anvarbek. "Isothermal Liquid Filtration." In Atlantis Studies in Differential Equations, 1–65. Paris: Atlantis Press, 2013. http://dx.doi.org/10.2991/978-94-6239-015-7_1.

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Meirmanov, Anvarbek. "Isothermal Liquid Filtration." In Atlantis Studies in Differential Equations, 241–63. Paris: Atlantis Press, 2013. http://dx.doi.org/10.2991/978-94-6239-015-7_6.

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Meirmanov, Anvarbek. "Filtration in Composite Incompressible Media." In Atlantis Studies in Differential Equations, 169–239. Paris: Atlantis Press, 2013. http://dx.doi.org/10.2991/978-94-6239-015-7_5.

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Meirmanov, Anvarbek. "Filtration of a Compressible Thermo-Fluid." In Atlantis Studies in Differential Equations, 67–87. Paris: Atlantis Press, 2013. http://dx.doi.org/10.2991/978-94-6239-015-7_2.

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Meirmanov, Anvarbek. "Double Porosity Models for a Liquid Filtration." In Atlantis Studies in Differential Equations, 135–67. Paris: Atlantis Press, 2013. http://dx.doi.org/10.2991/978-94-6239-015-7_4.

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Knopov, Pavel S., and Olena N. Deriyeva. "Filtration and Prediction Problems for Stochastic Fields." In Estimation and Control Problems for Stochastic Partial Differential Equations, 93–134. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-8286-4_3.

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Weber, Joa. "The Backward $$ \lambda $$ -Lemma and Morse Filtrations." In Analysis and Topology in Nonlinear Differential Equations, 457–66. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04214-5_27.

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Protter, Philip. "A connection between the expansion of filtrations and Girsanov's theorem." In Stochastic Partial Differential Equations and Applications II, 221–24. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/bfb0083949.

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Arnold, V. I., S. M. Gusein-Zade, and A. N. Varchenko. "The coefficients of series expansions of integrals, the weight and Hodge filtrations and the spectrum of a critical point." In Singularities of Differentiable Maps, 351–93. Boston, MA: Birkhäuser Boston, 1988. http://dx.doi.org/10.1007/978-1-4612-3940-6_14.

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Arnold, V. I., S. M. Gusein-Zade, and A. N. Varchenko. "The coefficients of series expansions of integrals, the weight and Hodge filtrations and the spectrum of a critical point." In Singularities of Differentiable Maps, Volume 2, 351–93. Boston: Birkhäuser Boston, 2012. http://dx.doi.org/10.1007/978-0-8176-8343-6_13.

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Conference papers on the topic "Differential filtration"

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Taschereau, Richard, and Arion F. Chatziioannou. "Preclinical dual-energy x-ray computed tomography through differential filtration." In 2008 IEEE Nuclear Science Symposium and Medical Imaging conference (2008 NSS/MIC). IEEE, 2008. http://dx.doi.org/10.1109/nssmic.2008.4774467.

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Bakhtiyarov, S. I., G. M. Panakhov, E. M. Abbasov, A. N. Omrani, and A. S. Bakhtiyarov. "Polymer Adsorption Phenomena in Porous Media Filtration Problems." In ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78551.

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This paper represents the results of the mathematical modeling of the chemical flood process in oil reservoirs. The mathematical model of a problem resulted in solution of the differential equations in private derivatives with initial boundary conditions. In non-uniform net area the problem is replaced with a discrete problem by means of combination of obvious and implicit-difference schemes increasing accuracy order and is solved by double-sweep method. The effective decision algorithms of one-dimensional problem as adsorption and convectional diffusion equations are obtained.
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Brekke, Olaf, and Lars E. Bakken. "Performance Deterioration of Intake Air Filters for Gas Turbines in Offshore Installations." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22454.

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Efficient inlet air filtration is a key element for limiting fouling, erosion, and corrosion in the compressor section of offshore gas turbine installations. Current filtration systems are normally successful in preventing serious erosion and corrosion problems in the compressor section, but significant performance deterioration caused by compressor fouling still remains a challenge. This performance deterioration increases fuel consumption and emissions and has a particularly severe economic impact when it reduces oil and gas production. Operating experience from different offshore installations has shown that the deterioration rate in gas turbine performance increases when the turbines are operating in wet or humid weather and that the differential pressure loss over the intake system is affected by ambient humidity. An experimental test rig has been built in the laboratory at the Norwegian University of Science and Technology (NTNU) in order to increase understanding of the fundamentals related to gas turbine inlet air filtration. This paper presents the results from an experimental investigation of the performance of gas turbine inlet air filter elements that have been in operation offshore. Performance under both dry and wet conditions is assessed. Different types of filter elements show significantly different changes in differential pressure signature when exposed to moisture, and all of the tested filter elements demonstrate a loss of accumulated contamination after operating in wet conditions. Hence, contaminants originally accumulated by the filter elements are re-entrained into the airstream on the downstream side of the filters when they are exposed to moisture. The change in differential pressure signature as a result of operating in wet conditions demonstrates another weakness of solely applying differential pressure for condition monitoring of the filter system.
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Skerlos, Steven J., N. Rajagopalan, Richard E. DeVor, Shiv G. Kapoor, and Robert A. Sanford. "Model of Biomass Concentration in Membrane Filtration Recycling Systems Subject to Single Substrate-Limited Growth Kinetics." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1887.

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Abstract Membrane filtration has the ability to limit microbiological growth in metalworking fluids (MWFs). To appropriately design and size a membrane filtration system for this application, the rate of microbial removal must be assessed relative to microbial population (biomass) growth. This research utilizes the Monod Equation describing biomass growth limited by a single substrate to evaluate if biomass levels can be maintained below a prescribed level in a perfectly mixed MWF system. The model for predicting biomass in the MWF system is obtained by numerical solution of a system of coupled nonlinear differential equations. The model solution permits membrane filtration design and sizing decisions based on microbial growth data specific to MWF chemistries, microbial species, and manufacturing facilities. It is revealed that the ratio of the filtration rate to the MWF volume must exceed the maximum specific growth rate of microorganisms to control biomass concentrations in the system under arbitrary initial substrate and contamination levels. The control of microbial growth in the system also requires that appropriate cleaning intervals be selected for the membrane filtration process tank. The microbial rejection coefficient, which is characteristic to a given membrane, has a dominant impact on the required cleaning interval.
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Kuznetsov, Ivan A., Warren Jasper, Srinivasan Rasipuram, Andrey V. Kuznetsov, Alan Brown, and Alexei V. Saveliev. "Development of Plasma Textile for Nanoparticle Filtration and Bacterial Deactivation." In ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icnmm2012-73019.

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A novel woven textile material capable of generating stable low temperature plasma was created. This resulted in enhancing the capture efficiency of nanoparticles when the material was used as a filter as well as exhibiting anti-bacterial properties. The primary supposition of the study is that a micro-plasma array can be embedded into a textile fabric to induce a plasma sheath that filters and deactivates bacterial pathogens coming into contact with the fabric. The work proceeded through a series of steps: (1) determining the optimal type of plasma discharge; (2) finding the ideal wire electrode material, radii and placement to achieve stable uniform generation of non-thermal plasmas; (3) modeling the electric field surrounding the electrodes to evaluate the impact of an insulating textile on the electrode system; (4) testing various polymers and developing a plasma textile based on electrode geometries found in experimentation; (5) measuring the filtration efficiencies of the plasmas using a differential mobility and a condensation particle counter; and (6) testing the textile fabric’s ability to deactivate bacteria. The work confirmed the existence of sustainable, uniform plasma on the surface of the developed fabric capable of capturing over 98% of bacteria-sized particles and deactivating tested bacteria.
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Chadwick, Chris. "Self Cleaning High Efficiency Particulate Air (HEPA) Filtration Without Interrupting Process Flow." In ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2011. http://dx.doi.org/10.1115/icem2011-59347.

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The strategy of protecting the traditional glass fibre HEPA filtration train from it’s blinding contamination and the recovery of dust by the means of self cleaning, pre-filtration is a proven means in the reduction of ultimate disposal volumes and has been used within the Fuel Production Industry. However, there is an increasing demand in nuclear applications requiring elevated operating temperatures, fire resistance, moisture resistance and chemical composition that the existing glass fibre HEPA filtration cannot accommodate, which can be remedied by the use of a metallic HEPA filter media. Previous research suggests that the then costs to the Department of Energy (DOE), based on a five year life cycle, was $29.5 million for the installation, testing, removal and disposal of glass fibre HEPA filtration trains. Within these costs, $300 was the value given to the filter and $4,450 was given to the peripheral activity. Development of a low cost, cleanable, metallic, direct replacement of the traditional filter train will the clear solution. The Bergman et al work has suggested that a 1000 ft^3/min, cleanable, stainless HEPA could be commercially available for $5,000 each, whereas the industry has determined that the truer cost of such an item in isolation would be closer to $15,000. This results in a conflict within the requirement between ‘low cost’ and ‘stainless HEPA’. By proposing a system that combines metallic HEPA filtration with the ability to self clean without interrupting the process flow, the need for a tradition HEPA filtration train will be eliminated and this dramatically reduces the resources required for cleaning or disposal, thus presenting a route to reducing ultimate costs. The paper will examine the performance characteristics, filtration efficiency, flow verses differential pressure and cleanability of a self cleaning HEPA grade sintered metal filter element, together with data to prove the contention.
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Yaroshenko, E. A., and A. M. Salnikov. "Obtaining of discontinuous solutions from multivalued solutions of nonlinear differential equations in the problem of multiphase filtration of hydrocarbons." In 2017 Tenth International Conference Management of Large-Scale System Development (MLSD). IEEE, 2017. http://dx.doi.org/10.1109/mlsd.2017.8109709.

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8

Kumar, Deepan Kishore, Adarsh Venkataraman Ganesan, Sundaram Swaminathan, Niti Nipun Sharma, and Ravi Kant Mittal. "A Novel MEMS Device for Selective Surface Adsorption of Lead (II) Ions From Blood Using Carbon Aerogel." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-66306.

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In this paper, we propose to design, simulate and fabricate a novel device design that would be capable of removing heavy metal ions like Lead or Arsenic from the Blood serum. The basic design of the device comprises of micro-needles at the inlet and the outlet, followed by a micro-channel where is blood is made to flow through a series of alternating constrictions. Every constriction has a coating of Carbon Aerogel to remove the Heavy metal ions like Pb. The design also eliminates the need for a valve or a micro pump as we ensure unidirectional flow by having fewer needles at the outlet as compared to the inlet and be placed in two regions of differential pressure. The present device (with surface dimensions of 100 × 150 × 75 microns) allows for blood filtration at the rate of 62.55 ml per week. Since the device has a slow filtration rate, multiple such Point-of Care device would be worn by the affected patients.
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Sheyman, Vladimir, and Mulchand S. Rathod. "Heat Transfer Between Particulates and Surface in a Vibrofluidized Layer." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41490.

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The apparatus, in which fluidization of the particulates is obtained by filtration of the gas in the upward direction through the layer of the particulates, is widely used in the industry for various types of processes. This gas serves as source of fluidized agent and the heat transfer carrier. In particular, the fluidized bed creates a favorable condition to carry out numerous heterogeneous processes. In spite of a significant advantage of this hydrodynamics regime, there are some drawbacks. The fluidization occurs only when sufficient filtration velocity of gases is achieved. In some cases when there is a significant difference in particulate sizes, this condition is not acceptable, and for a layer of fine particulates, such type of fluidization cannot be obtained at all. In the latter case, a combination of vibration and filtration of very small amount of gas through the layer is used, and the heat transfer to the solids occurs by conduction from the heating surface. In this paper, a set of differential equations for the heat and mass transfer are formulate and solved for variable and constant temperature of the heating surface. As a result, a relationship of the solid temperatures as a function of time is established. An experimental research also was performed. A comparison of the experimental research data and theoretical analysis shows that the deviation does not exceed 10%. The experimental research also shows that the main influence on the intensity of the mass transfer process has the amplitude of vibration and to the lesser extent the effects of frequency of vibration.
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Losito, R., M. Sternbach, A. Masson, M. Paguin, A. Boyer, and A. Trepanier. "HEMOSTATIC PARAMETERS DURING PREPARATION OF LEUKOCYTE-POOR BLOOD." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644159.

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Non-hemolytic febrile transfusion reactions are believed to be due to sensitization to granulocytes. Leukocyte removal can diminish or prevent the reaction. Use of the Pall filter (Pall Bio Medical Prod. Corp.) has resulted in some patient reactions. The purpose was to re-investigate this filter in vitro and compare it to the Imugard (Terumo) and the Erypur (Organon Teknika) filters and study their influence on hemostatic activation pathways. Method: RBC cones., aged 5 or 10 days, were centrifuged (5,200 R. P. M., 4°C, 15 m.). Cells were leftundisturbed for 6-24 hours before filtration. Hematological parameters analysed included: leukocyte, red cell and platelet counts, differential and scanning electron microscopy. Activation studies related to clotting, fibrinolysis, kinin and complement pathways including both biological and immuno-assays; they consisted of the recal time, PTT, pro time, Factors I, VIII, XII, HMW kininogen, kallikrein, F. D. P., AT-III, alpha 2-macroglobulin, alpha 1-antitrypsin, plasminogen, Cl inactivator, C3, C4 and C5. Over 75 filtrations have been performed. Results of cell recovery are illustrated in table below. Changes in tests related to activation were minimal with the Pall filter while a wide spectrum of derangements were common with the other twofilters.Conclusion: it appears the Erypur filter gives optimal results in the removal of leukocytes and platelets, whereas there is good recoveryof red cells by the Pall and Imugard filters. Secondly, the Pall filter (nylon) does not appear to be involved with the contact pathways whereas Erypur (cellulose acetate) and Imugard (cotton) have an influenceon these pathways.
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