Thematische Bibliographien / Voltage filtration

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Auswahl der wissenschaftlichen Literatur zum Thema „Voltage filtration“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 2. Februar 2022

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Zeitschriftenartikel zum Thema "Voltage filtration"

Szymański, Jerzy Ryszard, und Marta Żurek-Mortka. „Ground Leakage Current Caused by Common-Mode Voltage of PWM inverter“. Journal of Civil Engineering and Transport 1, Nr. 1 (31.01.2020): 15–25. http://dx.doi.org/10.24136/tren.2019.002.

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In railway tractive vehicles, three-phase PWM (Pulse Width Modulation) inverters generate parasitic Differential-Mode Voltages (DMV) and Common-Mode Voltages (CMV). Parasitic voltages are a side effect of using the width modulation to shape the phase-to-phase inverter’s voltage. In this article, the authors present a mathematical description of the DM and CM voltages and carry out their spectral analysis. Based on the spectral harmonics analysis, the authors present a method for filtration of harmonics of DM and CM voltages aimed at limiting the capacitance parasitic currents: due to DM voltage – phase-to-phase parasitic current and CM voltage – ground parasitic currents. As the final result of the tests, almost complete elimination of leakage parasitic current form PE shock protection system was achieved.

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Abouelatta, Mohamed Anwar, und Abdelhadi R. Salama. „An Equivalent Electrode System for Efficient Charging of Filtration Media“. Indonesian Journal of Electrical Engineering and Computer Science 3, Nr. 3 (01.09.2016): 646. http://dx.doi.org/10.11591/ijeecs.v3.i3.pp646-654.

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<p>This paper concerns the influence of moving an auxiliary limiting cylinder in X-Y directions on the electrostatic field and corona onset voltage of the dual electrode system employed in the electrostatic filtration process resulting in a “Tri-electrode” system. The Tri-electrode system is applied in order to control the field around the ionized wire and on the ground plate. Accurate calculation of the electrostatic field is obtained using the charge simulation method coupled with genetic algorithms. The calculated field values are utilized in computing the corona onset voltage of the ionized electrode. Laboratory measurements of the onset voltage of the ionized electrode are applied. It is found that the limiting cylinder controls the onset voltage of the ionized wire such that the ionized wire may be in ionized or non-ionized state without changing the position of the ionized wire itself. The numerical onset voltage values agreed satisfactorily with those measured experimentally. </p>

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Zhao, Jin Yu, Zhao Lin Liu und Ju Chuan Shan. „Tunable Fabrication of Electrospun Polyvinyl Alcohol Nanofibrous Membrances for Effective Air Filtration“. Key Engineering Materials 748 (August 2017): 423–27. http://dx.doi.org/10.4028/www.scientific.net/kem.748.423.

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Polyvinyl alcohol (PVA) nanofibrous membrances for effective air filtration were fabricated by electrospinning. Tunable fiber morphologies can be formed by facilely regulating the solution concentration and the applied voltage, and their effect on filtration performance of the PVA membrances were also investigeted. Results show that the PVA membrance exhibits high filtration efficiency of 97.1% and low pressure drop of 113 Pa when the PVA concentration is 8 wt% and the applied voltage is 15 kV with a tip-to-collector distance of 15 cm and a feed rate of 1 ml/h.

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Jiang, Ting Ting, Wei Min Kang und Bo Wen Cheng. „Preparation and Characterization of Electrospun CPVC Nanofiber Nonwovens“. Advanced Materials Research 557-559 (Juli 2012): 456–59. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.456.

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In this paper, the chlorinated poly (vinyl-chloride) (CPVC) nanofiber were successfully prepared via electrospinning of the proper spinning solution, which was obtained by dissolving CPVC granules in N,N-dimethylformamide (DMF) and tetrahydrofuran (THF) mixture. The results indicates that the morphology of the fibers is influenced by solution concentration and applied voltage. The finer and uniform nanofiber is electrospun from total solid content of the spinning solutions at 16wt.% and the spinning voltage at 26kV. The surface potential of CPVC nanofiber nonwovens increases with the spinning voltage and the filtration efficiency increases firstly and then decreases. In spinning voltage of 26 kV, filtration efficiency reaches a maximum of 99.925%.

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Ahne, Joerg, Qinghai Li, Eric Croiset und Zhongchao Tan. „Electrospun cellulose acetate nanofibers for airborne nanoparticle filtration“. Textile Research Journal 89, Nr. 15 (28.10.2018): 3137–49. http://dx.doi.org/10.1177/0040517518807440.

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Reported in this paper are the effects of tip-to-collector distance, voltage, deposition time and solution concentration on the fiber size distribution and filter quality factor of electrospun cellulose acetate (CA)-based nanofibers. Nanofibrous filter samples were produced by electrospinning in a laboratory setting. The CA solutions were prepared by diluting various concentrations of CA in a 2:1 (w:w) ratio of N,N-dimethylacetamide (concentration 10–20 wt.%). The electrospinning voltages ranged from 8–12 kV, with distances from 10–15 cm and deposition times of up to 30 minutes. The produced nanofibrous filter samples were then analyzed in terms of fiber size distribution and filter quality factor using nanosized sodium chloride particles ranging from 4–240 nm in diameter. The maximum filtration efficiency measured was 99.8% for filter samples obtained with an overall deposition time of 30 minutes. The maximum filter quality factor was 0.14 Pa−1 for a CA concentration of 20 wt.% and a tip-to-collector distance of 15 cm. The average fiber diameters of the fibers were between 175 and 890 nm, and CA concentrations below 15% led to the formation of beads.

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Wei, Liang, Hongnan Zhang und Xiaohong Qin. „Fabricated narrow diameter distribution nanofiber for an air filtration membrane using a double rings slit spinneret“. Textile Research Journal 89, Nr. 6 (21.02.2018): 936–47. http://dx.doi.org/10.1177/0040517518758009.

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A needleless electrospinning setup called “Needleless Double Rings Slit Electrospinning” was proposed for the first time. The control pump transports solution to the double rings slits through an insulated infusion tube. High voltage is applied to the metal ring and electric force exceeds the surface tension and viscosity, and multiple jets are spontaneously formed on the top of solution surface. Different spinning process parameters, including solution concentration, applied voltage, collection distance and spinning time, have an influence on nanofiber diameter distribution. The morphology of nanofibers has been observed using scanning electron microscopy. It is worth noting that narrow diameter distribution nanofibers have been fabricated using a novel double rings slit spinneret. Nanofiber diameter distribution has determined the mean pore diameter, pore diameter distribution, filtration efficiency and filtration resistance. The final results show that the pore size and filtration property for nanofiber membranes are significantly related with nanofiber diameter distribution. Narrow diameter nanofibers have contributed to the improvement of filtration properties for nanofiber membranes.

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Singh, Alka. „Performance Analysis of a Shunt Compensator Controlled Using Modified Synchronous Reference Theory“. Advances in Electrical Engineering 2014 (07.08.2014): 1–10. http://dx.doi.org/10.1155/2014/392187.

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This paper deals with the control of distribution energy resource (DER) connected to a grid connected system feeding nonlinear loads. The DER is controlled to provide power quality improvement capabilities, namely, power factor correction, harmonic reduction, and load balancing. The developed controller is based on modification of synchronous reference theory. It possesses unique features such as filtration and fundamental voltage extraction from the polluted grid voltages to eliminate harmonics and unbalance. Additionally, the control is implemented over the square of DC link voltage. The distributed generation source is realized as a voltage source converter. Both simulation and experimental results prove the effectiveness of control algorithm with nonlinear loads. The control algorithm works well for power factor correction, harmonic reduction, and operation under unbalanced load condition. The dynamics of the system under load change and load unbalancing are well depicted.

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Aliabadi, Majid. „Effect of electrospinning parameters on the air filtration performance using electrospun polyamide-6 nanofibers“. Chemical Industry and Chemical Engineering Quarterly 23, Nr. 4 (2017): 441–46. http://dx.doi.org/10.2298/ciceq160509059a.

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Due to their high filtration efficiency and low basis weight nanofibrous filters are suitable for filtration applications. The objective of this study was to investigate the effect of electrospinning parameters including polymer solution concentration (10-15 wt.%), applied voltage (15-25 kV) and tip-collector distance (7.5-12.5 cm) on the filtration efficiency of polyamide (PA) nanofibers. The morphology of the PA nanofibers was characterized using scanning electron microscope (SEM) analysis. The SEM image results indicated that the average fiber diameter of PA nanofibers was 220 nm at PA solution concentration of 12.5 wt.%, applied voltage of 20 kV, tip-collector distance of 10 cm, flow rate of 0.5 mL h-1, temperature of 25 ?C and humidity of 40%. The obtained results showed that the highest quality factor and efficiency of 7.02?10-2 Pa-1 and 96% were optimal parameters for nanofibrous filters during 30 and 240 min of electrospinning time, respectively. The presented study showed that the morphology optimization of nanofibers is an effective method for improvement of filtration performance.

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Xin, Baomin, und Milton L. Lee. „Voltage programming in capillary electrochromatography“. Journal of Microcolumn Separations 11, Nr. 4 (1999): 271–75. http://dx.doi.org/10.1002/(sici)1520-667x(1999)11:4<271::aid-mcs4>3.0.co;2-#.

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Abukhanafer, Ghassan, Alaa H. Al-Fatlawi und Hassan H. Joni. „Effect of Pulse Electric Field on Water Characteristics as a Disinfection Function in Filtration Unit“. Engineering and Technology Journal 39, Nr. 1A (25.01.2021): 116–22. http://dx.doi.org/10.30684/etj.v39i1a.1632.

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This paper studied the impact of the addition of pulse electric-filed low voltage (PEF-LV) in the filtration process by designing, constructing, and operating a pilot-scale. The Disinfectant process (DP) demonstrated several benefits in terms of efficiency and ease of application, without the use of any chemical additive. This system contains two pairs of silver mesh electrodes inside the filtration column test with a low pulse voltage for killing microorganisms. The parametric effects of DP performance, such as alternating current pulse frequency and the voltage applied were investigated. The effect of PEF-LV on the biological, physical, and chemical characteristic of water was studied. The transmission electron microscopy (TEM) was used to examine the change of the cell wall morphology of Escherichia coli, Staphylococcus aureus cells for influent, and treated water. The results show the removal efficiency of E. coli and S. aureus 96 % at 30 V and 0.5 Hz.

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Dissertationen zum Thema "Voltage filtration"

Thome, Brian Matthew. „Increasing the scale of electrophoretic true moving bed enantiomer separations using voltage gradients and filtration enhancement“. Online access for everyone, 2006. http://www.dissertations.wsu.edu/Dissertations/Fall2006/b_thome_110706.pdf.

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Gábel, Marián. „Spínaný stejnosměrný laboratorní zdroj 30V 60A“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442786.

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The master thesis deals with design of a switched DC power supply with output parameters of 30 V 60 A. The power supply uses the connection of two single switch forward converters with opposite phase. The topology was chosen based on a comparison of specific schematics in the first part. The body of the thesis is covered in chapter which deals with design and analysis of power circuits of the converter. The chapter describes detailed design of pulse transformers, dimensioning of semiconductors and cooling system of the converter. For lower power losses, the system of synchronous rectifying is chosen at the output of the circuit. The regulation of the output is based on cascade structure with a superior voltage and dependent current loop. Appropriate over current protection is provided by sensing the output current and using current transformers for primary current measure.

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Yu, Xiaoxi. „Valorisation de la biomasse lignocellulosique humide par la mise en place de procédés d'extraction et de séparation des polyphénols et des protéines : cas des tiges de colza“. Thesis, Compiègne, 2015. http://www.theses.fr/2015COMP2246.

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Ce travail de thèse concerne l'étude et l'évaluation de l'extraction et de la séparation de molécules d'intérêt à partir des résidus de colza. L'impact des différents traitements (broyage, champs électriques pulsés, décharges électriques de hautes tensions et ultrasons) sur l'amélioration de l'extraction des polyphénols et des protéines à partir des tiges de colza a été comparé. Ces traitements permettent d'endommager les membranes et/ou parois cellulaires de manière mécanique, électrique ou acoustique, facilitant ainsi la libération des composés intracellulaires vers le milieu extérieur. La cinétique d'extraction, le rendement en polyphenols totaux et en protéines et la consommation énergétique sont principalement étudiés. De plus, l'efficacité des traitements étudiés pour l'extraction des polyphénols et protéines, en fonction du degré de maturité de la plante a été étudiée. Les méthodes testées pour la séparation des extractibles (polyphénols et protéines) concernent la coagulation, la filtration membranaire ainsi que le couplage de ces deux méthodes afin de réduire la consommation de solvants organiques et la rétention des polyphénols au cours de séparation. La séparation des extractibles a été évaluée par le biais de l'analyse de pureté et du taux de rétention. Enfin, des effets positifs du traitement électrique sur l'étape de séparation des extractibles tels que l'augmentation du flux du perméat et la diminution du colmatage ont été remarqués
This thesis work concerns the study and the evaluation of the extraction and the separation of valuable compounds from rapeseed residues. The impact of different treatments (grinding, pulsed electric fields, high voltage electrical discharges and ultrasound) on the enhancement of the extraction of polyphenols and proteins from rapeseed stems was compared. These treatments can damage cell membranes and 1 or cell walls mechanically, electrically or acoustically, thus facilitating the release of intracellular compounds to the surroundings. The extraction kinetics, yield of total polyphenols and proteins and energy consumption were mainly studied. In addition, influences of plant maturity on the efficiency of studied treatments for the extraction of polyphenols and proteins have been studied. The methods tested for the separation of extractives (polyphenols and proteins) include coagulation, membrane filtration and the combination of these two methods in order to reduce the consumption of organic solvents and the retention ofpolyphenols during separation. The separation of extractives was evaluated by means of analysis of purity and relative removal. Finally, positive effects of electrical treatment on the extractive separation step such as the increase ofpermeate flux and the decrease of membrane fouling have been observed

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Šimoník, Petr. „Měřič odstupu signálu od šumu obrazových signálů“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217681.

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The diplomma thesis is dealing with possibilities of Signal to noise ratio measurement by method, which is based on direct measurement. It is chosen the most suitable method – signal and noise separation to two different parallel signal branches, where is measured signal strength in one branch and root mean square value in the other. The thesis is consisted of a concept of detail block scheme of Signal to noise ratio meter, which was designed in terms of theoretical knowledge. Particular functional blocks were circuit-designed, the active and passive parts were chosen and their function were described. There were made simulation and displayed input and output time flows. There is designed the whole connection of engineered Signal to noise ratio meter in the last part of my thesis. The double-sided board of printed circuit is contained too. It was created simple programme for supervisor micro-processor. Thereby were constructed complete bases for realization.

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Yi, Liao Ben, und 廖本逸. „Effect of the Corona Discharge on the Electrostatic Voltage and the Filtration Efficiency of Electret PP / PTFE Composites“. Thesis, 2000. http://ndltd.ncl.edu.tw/handle/69817442490005124440.

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碩士
逢甲大學
紡織工程學系
88
At the moment of striding new century, improving technology promotes our living standard, however, the pollution it brings are destroying our living environment. It has been an important research direction of preventing this visible or invisible destruction, especially the project of filtering micro-dust in air. So far, the electret filter material made by the way of conona discharge is the most effective one. Therefore, in this moment, it is essential to develope the technique of electret filters in great demand. In this study, we discuss the influence of process parameters (e.q. discharge voltage, discharge time, and material compositions) on the electrostatic voltage and the electric field intensity of electret filters. The relationships between pressure drop, filtration efficiency, different discharge voltage and composite types are also involved. The parameters available in this study are as follows: discharge voltages are from 5 kV to 35 kV in stepwise of 10 kV, discharge times of 20 sec, 13 sec, 10 sec, 8 sec and 6 sec, materials including five compositions consist of PP nonwoven fabrics with weight of 10 and 15 g/m2 and PTFE film with thickness of 25, 40 and 70 mm , high-pressure temperature: 115 ℃ and electrode: 3 wires type. For increasing the electrostatic voltage of electret composites, we used an 165 w ultraviolet (UV) rays for increasing initiation ability of out-layer electron, that is capable of increasing polarization. The experimental results show that the electric field intensity is increased with the discharge voltage before it reaches the optimal value. Independent of material, the optimal value is about 10 kV smaller then the voltage of spark discharge. Furthermore, this value also reveals a better filtration efficiency and a relative high-pressure drop. Theoretically, the longer the material is charged by the electrode, the more the air is ionized and the larger is the electric field intensity. The experimental results are quit coincide with the principle. The filtration efficiency as well as pressure drop is also increased with the discharge time.

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Chen, Ting-Lung, und 陳定隆. „Study on innovative stainless steel mesh filter for oil mist filtration -Development of inertial impactor and multi-layered high-voltage electrostatic mesh filter“. Thesis, 2019. http://ndltd.ncl.edu.tw/handle/va84zr.

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碩士
國立臺灣大學
應用力學研究所
107
Fine particulate matter (PM2.5) is a critical and imperative problem in Asia. It has been classified as the 1A carcinogen by The United Nations International Agency for Research on Cancer (IARC). According to the latest TEDS 9.0 (Taiwan Emission Data System 9.0), it shows that oil mist emissions from restaurants account for 6.39% of the total PM2.5 emissions in 2013. This ratio is even higher than power supply industries that only contributes 3.64％ of total emission. For housewives who do not smoke in Taiwan, their risk to develop lung cancer can increase by 3.2% to 12.2% through a long term exposure of oil mist at high temperature. Therefore, an effectively control to oil mist emissions is a very important task nowadays However, common commercial fiber-based filters can be quickly masked by oil mist and are needed to be replaced frequently. In order to prolong the lifetime of the fiber filter, an inertial impactor plate and stainless steel mesh filter are used in this paper. They are less likely to clog when filtering oil mist and oils can be directed for collection by design of oil trenches. Furthermore, a high voltage stainless steel mesh array with a high electric field are also introduced to collect charged particles in the air for long term usage. For the impactor developed in this study, liquid channels are designed in the inertial impactor plate, and the filtered oil droplets are collected and drained in the channel. At the flow rate of 45 cm/s, the oil mist with aerodynamic diameter larger than 6 μm can be filtered. For the particles smaller than aerodynamic diameter of 6 μm can be captured by the multi-layered high-voltage electrostatic mesh filter. A high electric field is applied to the multi-layered mesh filter for improving filtration efficiency. Parameters include the electric field, the number of filter layers, the filtration flow rate and the filter structure. Finally, we developed a 27-layer 100-mesh stainless steel filter driven under 1.4 kV/mm electric field with the optimal performance. At a filtration flow rate of 15 cm/s, the filtration efficiency of particles with particle size larger than 50 nm is above 50%, and the filtration of particles with particle size larger than 120 nm reached 70%. This method provides means to reduce the oil mist loading on the back fiber filter and prolong its lifetime for long term usage.

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Buchteile zum Thema "Voltage filtration"

Yudoyono, Gatut, Diky Anggoro, Lutfi Fitria Ningsih und Rizki Romadoni. „Fabrication of PVA/Carbon-Based Nanofibers Using Electrospinning“. In Nanofibers - Synthesis, Properties and Applications. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96175.

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Nanofibers are widely used in various fields, including water filtration. In the development of nanofibers as water filtration, a mixture of carbon in a polymer solution is often used. Nanofibers can be made by several methods such as multicomponent fiber spinning techniques, melt blowing, electrospinning. Electrospinning is currently a simple development method but can produce nanofibers with a small fiber diameter, it is easy to develop and many parameters can be controlled. Parameters that affect the results of the nanofibers that are formed include flow rate or syringe pump flow rate and high voltage dc high voltage. Various types of nanofibers can be produced from various types of polymers, both natural polymers and synthetic polymers. Generally, because they have properties and characteristics such as high surface area, small pore size, and the possibility to be developed in various applications. Therefore, this chapter discusses the electrospinning of carbon nanofibers using PVA polymer.

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„Application of Biopolymeric Electrospun Nanofibers in Biological Science“. In Materials Research Foundations, 156–201. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901076-7.

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Biopolymers are those class of macromolecules which are found in nature or extracted from the living organisms. Various structures and properties of the biopolymers-based materials are well researched till to date. These mainly includes hydrogels, bio glasses, bio inks, biocomposites, fibers and others. These biopolymers-based structures have some limitations. However, Biopolymers have some common advantages (i.e., non-toxicity, easy availability, monodispersity, degradability, and better solubility etc.) and disadvantages (i.e., poor thermal and chemical stabilities, brittleness etc.). To overcome these disadvantages, it is necessary to tailor these polymers by few emerging techniques like “Electrospinning”. Electrospinning is one of the easiest techniques to prepare nanofibers from polymeric solutions by applying high voltage. Obtained nano/micro structural polymeric fibers have good properties like high surface area, porosity and low weights etc. The materials having high surface area and porosity can easily interact with cells and tissues, are better mobile vehicles for drugs, as well as possess good filtration and adsorption abilities. Thus, these one-dimensional structures of the biopolymers are very useful in various fields of biomedical especially water sanitation/desalination, tissue engineering, drug delivery and scaffolds. Various biopolymers like chitosan, chitin, sodium alginate, guar gum, polylactic acid and others are successfully fabricated as fibers and used in various fields of biomedical.

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Konferenzberichte zum Thema "Voltage filtration"

Parit, Ajinkya B., H. T. Jadhav und R. A. Wanjari. „An inbuilt passive harmonic filtration transformer for low voltage distribution network“. In 2017 International Conference on Circuit ,Power and Computing Technologies (ICCPCT). IEEE, 2017. http://dx.doi.org/10.1109/iccpct.2017.8074272.

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Huang, Lei, und Zhixiong Guo. „Nano Filtration and Sensing of Aminoglycosides Using Whispering-Gallery Mode Resonators“. In ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/mnhmt2012-75174.

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For the first time optical WGM micro resonator embedded in a microelectrofluidic system with integrated functions in sensing and nano filtration was proposed. Aminoglycosides were considered as the analyte molecules. The filtration process and analyte concentration were traced by measuring the WGM resonance frequency shift. A correlation between the frequency shift, and the analyte feed concentration and the applied voltage gradient was obtained, which reveals a linear relationship between the resonance frequency shift and the analyte concentration and an exponential growth with the applied voltage gradient. The applied voltage gradient influences the filtration capability through its effect on adsorption and desorption processes. The second-order WGM was found to be able to provide a higher sensitivity as compared with the first-order. The WGM sensor was found to function at pico Molar concentration.

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Wang, Feipeng, Chunxiang Wan, Jian Li, Zhengyong Huang, Fan Fan und Gang Wen. „Effect of Fluorination and Isothermal Crystallization on Polypropylene Electret Fiber Films for Transformer-oil Filtration“. In 2018 IEEE International Conference on High Voltage Engineering and Application (ICHVE). IEEE, 2018. http://dx.doi.org/10.1109/ichve.2018.8642078.

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Yeckel, Christopher, und Randy Curry. „Pulsed breakdown characterization of two dielectric oils with a BST nanoparticle suspension and varying filtration pore size“. In 2010 IEEE International Power Modulator and High Voltage Conference (IPMHVC). IEEE, 2010. http://dx.doi.org/10.1109/ipmhvc.2010.5958316.

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Aronu, Obinna, Harvey Abramowitz und Agbai George Nnanna. „Membrane Fouling Mitigation in Water Filtration Using Piezoelectrics“. In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11313.

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Abstract The clogging of filtration membrane by particles otherwise known as fouling is a major concern in membrane filtration technology due to severe flux reduction associated with it, which results to the reduction of membrane lifespan, reduced system performance and increased process and operating costs in industries that utilize membrane in their production process. This is because the cleaning or replacement of the fouled membrane requires production to be interrupted for the cleaning process or the entire system to be shut down for the replacement process to take place, leading to great loses to the industries involved. Many approaches have been devised over the years through research to tackle this problem, some of which not only undermine the performance of the filtration membrane but also contribute to great loses to industries that apply them. Cheaper and more efficient means of fouling control remains the key to salvaging this problem. This work proposes a water filtration system in which piezoelectric crystals attached at strategic points on a tubular polyvinylidene fluoride (PVDF) membrane are used to increase flux and delay the clogging of the pores of the filtration membrane by particles during water filtration. Filtration tests with mud solution show that the membrane vibrated with piezoelectrics reduced the clogging of the pores and increased permeate flux of the filtration process as compared with the case where the membrane was not vibrated with piezoelectrics, suggesting that vibrating the system with piezoelectrics is a good fouling reduction method that can be used in fluid separation processes. To optimize the permeate flux production of the system and fouling reduction, the anti-fouling effects of the piezoelectric crystals on the membrane surface is investigated through experiments together with the effects of voltage application, positioning and placement distance of the piezoelectrics and some other variables involved in this work.

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Deng, Dawei, Shicheng Li und Guochao Fan. „Determination of space-charge distribution under ultra-high-voltage direct current transmission lines based on air filtration method“. In 2019 3rd International Conference on Electronic Information Technology and Computer Engineering (EITCE). IEEE, 2019. http://dx.doi.org/10.1109/eitce47263.2019.9094883.

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Ahmad, Naseer, Anwar Khalil Sheikh, Mostafa Elshafie und Hussain Al-Qahtani. „Design and Development of Instrumentation and Data Acquisition for a Photovoltaic Driven Community Scale RO Desalination System and its Performance Studies“. In ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/esda2014-20403.

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This work is related to the design and development of instrumentation, data acquisition and graphical user interface of Photovoltaic driven Reverse Osmosis system for monitoring and performance evaluation purposes. Installed PV system comprises of 12 PV panels, trackers, batteries and inverter whereas RO system is equipped with pre filters, pumps, energy recovery devices and filtration membranes. Proper instrumentation is carried out in PV system to measure the irradiation, temperatures, voltage and current at various points. Moreover various sensors are used to measure the pressures, flows, salinities at RO unit. Signal conditioning circuits are designed to adjust sensor output signals for computer interface. A simple moving average filter is used to suppress the measurement noise. The experimental investigation of PVRO system is carried out by using LabVIEW interface capabilities. The developed system reveals and stores the pronounced impact of measured variables on the PV output power and specific energy consumption of the RO filtration system. The online data display in multi-scale window frame is very informative for system operation and analysis. During the experimental run of PVRO system using the developed DAQ system, the PV system generated 7.5kWh of energy during the whole day operation. Feed water having 7100ppm salinity and its flow rate was set to 850 lit/hour by adjusting the RPM of the high pressure pump. Clean water flow rate is recorded to be at 465 lit/hour having salinity of 115 ppm during the RO operation. Specific energy consumption of RO system comes out to be 2.083kWh/m3 for 7100ppm salinity of feed water.

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Kim, Bongsu, und Yi Zhao. „Programmable Micropatterning of Polymer Nanofibers“. In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-40614.

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This paper reports programmable micropatterning of electrospun nanofibrous materials using a collector chip that consists of an array of independently controllable microelectrodes. The microelectrodes on the collecting chip are prepared by standard photolithography. By programming the local electrical field using excited and floating electrodes, the collector chip allows patterning of microstructures with controllable characteristics. The difference of electrostatic force between the excited and the floating electrodes increases the patterning contrast of electrospun nanofibers. The arbitrary geometries are successfully patterned on the array of 6 × 6 electrodes by independently programmable control of the voltage of each electrode. The experimental result also shows that it is possible to control the porosity and alignment of fibers. This method provides a simple yet highly reliable approach for creating combined micro/nanostructures of polymer nanofibers in a cost effective manner, which has great potential in functional tissue engineering, filtration, and chemical sensing. The work is also expected to foster the use of nanofibers in microdevices for on-chip biochemical analysis, and controlled infiltration and proliferation. The resulting nanofibers with controllable porosity are especially useful for the construction of tissue engineering scaffolds with morphological and functional similarity with natural tissues.

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Bingham, Bruce C., Atanas A. Atanasov und John P. Parmigiani. „The Design and Fabrication of an Electrochemical Machining Test Apparatus“. In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-66299.

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The removal of residual casting material from gating has traditionally been performed by abrasive grinding techniques. However, high amounts of belt wear can occur when working with high strength alloys, especially those typically seen in the aerospace industry. An alternative machining process called electrochemical machining (ECM) uses electrolysis to precisely remove material at high rates. ECM has many advantages over conventional grinding: no tool wear, no induced mechanical or thermal stresses, and high removal rates independent of material hardness or strength. The industrial application of ECM to residual casting material removal can potentially realize large cost savings and decreased component processing time by eliminating belt wear and increasing material removal rates. The approach taken in this work is the design and fabrication of a laboratory apparatus for the purpose of testing the ECM of casting material. Commercial ECM machines, while more powerful, can be excessively large and cost prohibitive when performing an initial feasibility study. Many times these commercial machines are calibrated to mass produce a specific part, and do not have the level of variability desired for laboratory experimentation. The test apparatus presented provides a robust and relatively low cost method of investigating the applicability of ECM to this purpose. The device is comprised of an electrolyte filtration and delivery system, a stable machining enclosure, and a single axis computer controlled tool. The ECM variables that can be adjusted include electrolyte temperature, mass flow rate, applied voltage, tool feed rate, and electrode gap. Process data from these variables is collected via multiple sensors in the machine and provides real-time feedback to users. A universal tool connection and workpiece fixture allows for different experimental setups to be easily tested. From experimentation with this test apparatus, it will be possible to identify optimum methods for the ECM of these residual casting artifacts.

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