The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform
Lipeng Wang - One of the best experts on this subject based on the ideXlab platform.
-
Disintegration of waste activated sludge by a combined treatment of alkaline-modified eggshell and Ultrasonic Radiation
Journal of Environmental Chemical Engineering, 2017Co-Authors: Yulin Xiang, Yukun Xiang, Lipeng WangAbstract:Abstract In order to improve disintegration performance of waste activated sludge, alkaline-modified eggshell and Ultrasonic Radiation were introduced. Eggshell was subjected to modification treatment to produce calcium oxide (CaO). The calcium oxide was characterized by X-ray diffraction (XRD) and thermogravimetric analysis (TGA). XRD patterns showed CaO intense peaks. TGA profile indicated the components of eggshell were constant at above 850 °C. The alone and combined treatment effects of alkaline-modified eggshell and Ultrasonic Radiation on the disintegration of waste activated sludge were studied. The combination of alkaline-modified eggshell and Ultrasonic Radiation treatment processes could enhanced the disintegration of waste activated sludge. Optimum conditions were pH of 12, Ultrasonic power of 330 W, and disintegration time of 15 min for the combined treatment process. The disintegration efficiency of waste activated sludge reached 45% under the optimized condition. The combined process of alkaline-modified eggshell and Ultrasonic Radiation was effective and feasible to disintegrate waste activated sludge.
Philip L. Marston - One of the best experts on this subject based on the ideXlab platform.
-
Excitation of a vertical liquid capillary jet waveguide by modulated Ultrasonic Radiation pressure
The Journal of the Acoustical Society of America, 2007Co-Authors: Joel B. Lonzaga, David B. Thiessen, Philip L. MarstonAbstract:The excitation of a liquid capillary jet issuing from a nozzle is investigated using internally applied modulated Ultrasonic Radiation pressure. The transducer used here is more efficient than one used in prior studies [J. B. Lonzaga et. al., J. Acoust. Soc. Am. 116, 2598 (2004)] and is suitable for nozzle velocities as low as 25 cm/s. At low velocities, the liquid jet is significantly tapered. As a consequence of the taper, the acoustic cutoff frequency increases with increasing distance from the nozzle. For ultrasound propagation down the jet from the nozzle, finite‐element calculations of the Radiation pressure show that the radial stress at the cutoff location is significantly larger than at any other region of the jet. Two distinct capillary modes exist and are conjectured to be excited near the cutoff location by modulated Radiation pressure: one traveling upward and the other traveling downward. In a certain range of modulation frequencies, the latter is an exponentially growing mode and leads to t...
-
Liquid jet response to internal modulated Ultrasonic Radiation pressure and stimulated drop production
The Journal of the Acoustical Society of America, 2007Co-Authors: Joel B. Lonzaga, David B. Thiessen, Curtis F. Osterhoudt, Philip L. MarstonAbstract:Experimental evidence shows that a liquid jet in air is an acoustic waveguide having a cutoff frequency inversely proportional to the jet diameter. Ultrasound applied to the jet supply liquid can propagate within the jet when the acoustic frequency is near to or above the cutoff frequency. Modulated Radiation pressure is used to stimulate large amplitude deformations and the breakup of the jet into drops. The jet response to the modulated internal Ultrasonic Radiation pressure was monitored along the jet using (a) an optical extinction method and (b) images captured by a video camera. The jet profile oscillates at the frequency of the Radiation pressure modulation and where the response is small, the amplitude was found to increase in proportion to the square of the acoustic pressure amplitude as previously demonstrated for oscillating drops [P.L. Marston and R.E. Apfel, J. Acoust. Soc. Am. 67, 27-37 (1980)]. Small amplitude deformations initially grow approximately exponentially with axial distance along the jet. Though aspects of the perturbation growth can be approximated from Rayleigh's analysis of the capillary instability, some detailed features of the observed jet response to modulated ultrasound are unexplained neglecting the effects of gravity.
-
P2L-5 Modulated Ultrasonic Radiation Pressure: Liquid Jet Response and Stimulated Breakup
2006 IEEE Ultrasonics Symposium, 2006Co-Authors: Joel B. Lonzaga, David B. Thiessen, Philip L. MarstonAbstract:Double sideband suppressed carrier excitation is utilized to achieve modulated Ultrasonic Radiation pressure (MURP). MURP is shown to be an effective method to stimulate low-frequency drop production rates from large laminar liquid jets. The jet deformation oscillates and drops are generated at the frequency of the MURP and when the jet deformation is small its amplitude is experimentally found to be proportional to the Radiation pressure amplitude; both are manifestations of the oscillating Radiation pressure effect. The method was previously demonstrated for acoustically levitated drops
-
Capillary bridge modes driven with modulated Ultrasonic Radiation pressure
Physics of Fluids, 1996Co-Authors: Scot F. Morse, David B. Thiessen, Philip L. MarstonAbstract:The method of modulated Ultrasonic Radiation pressure, previously used to drive the capillary modes of drops and bubbles, is used to excite the capillary modes of a cylindrical oil bridge in a Plateau tank. Specific modes may be selected by adjusting the modulation frequency and the location or orientation of the bridge in the Ultrasonic field. Mode frequencies were measured as a function of the slenderness for the lowest two axisymmetric modes and two nonaxisymmetric modes. The frequencies of the lowest modes agree with an approximate theory which neglects viscous corrections where the interfacial tension is a fitted parameter.
Yulin Xiang - One of the best experts on this subject based on the ideXlab platform.
-
Disintegration of waste activated sludge by a combined treatment of alkaline-modified eggshell and Ultrasonic Radiation
Journal of Environmental Chemical Engineering, 2017Co-Authors: Yulin Xiang, Yukun Xiang, Lipeng WangAbstract:Abstract In order to improve disintegration performance of waste activated sludge, alkaline-modified eggshell and Ultrasonic Radiation were introduced. Eggshell was subjected to modification treatment to produce calcium oxide (CaO). The calcium oxide was characterized by X-ray diffraction (XRD) and thermogravimetric analysis (TGA). XRD patterns showed CaO intense peaks. TGA profile indicated the components of eggshell were constant at above 850 °C. The alone and combined treatment effects of alkaline-modified eggshell and Ultrasonic Radiation on the disintegration of waste activated sludge were studied. The combination of alkaline-modified eggshell and Ultrasonic Radiation treatment processes could enhanced the disintegration of waste activated sludge. Optimum conditions were pH of 12, Ultrasonic power of 330 W, and disintegration time of 15 min for the combined treatment process. The disintegration efficiency of waste activated sludge reached 45% under the optimized condition. The combined process of alkaline-modified eggshell and Ultrasonic Radiation was effective and feasible to disintegrate waste activated sludge.
Merritt Maduke - One of the best experts on this subject based on the ideXlab platform.
-
Dynamic response of model lipid membranes to Ultrasonic Radiation force.
PloS one, 2013Co-Authors: Martin Loynaz Prieto, Omer Oralkan, Butrus T. Khuri-yakub, Merritt MadukeAbstract:Low-intensity ultrasound can modulate action potential firing in neurons in vitro and in vivo. It has been suggested that this effect is mediated by mechanical interactions of ultrasound with neural cell membranes. We investigated whether these proposed interactions could be reproduced for further study in a synthetic lipid bilayer system. We measured the response of protein-free model membranes to low-intensity ultrasound using electrophysiology and laser Doppler vibrometry. We find that Ultrasonic Radiation force causes oscillation and displacement of lipid membranes, resulting in small (
-
dynamic response of model lipid membranes to Ultrasonic Radiation force
PLOS ONE, 2013Co-Authors: Martin Loynaz Prieto, Omer Oralkan, B T Khuriyakub, Merritt MadukeAbstract:Low-intensity ultrasound can modulate action potential firing in neurons in vitro and in vivo. It has been suggested that this effect is mediated by mechanical interactions of ultrasound with neural cell membranes. We investigated whether these proposed interactions could be reproduced for further study in a synthetic lipid bilayer system. We measured the response of protein-free model membranes to low-intensity ultrasound using electrophysiology and laser Doppler vibrometry. We find that Ultrasonic Radiation force causes oscillation and displacement of lipid membranes, resulting in small (<1%) changes in membrane area and capacitance. Under voltage-clamp, the changes in capacitance manifest as capacitive currents with an exponentially decaying sinusoidal time course. The membrane oscillation can be modeled as a fluid dynamic response to a step change in pressure caused by Ultrasonic Radiation force, which disrupts the balance of forces between bilayer tension and hydrostatic pressure. We also investigated the origin of the Radiation force acting on the bilayer. Part of the Radiation force results from the reflection of the ultrasound from the solution/air interface above the bilayer (an effect that is specific to our experimental configuration) but part appears to reflect a direct interaction of ultrasound with the bilayer, related to either acoustic streaming or scattering of sound by the bilayer. Based on these results, we conclude that synthetic lipid bilayers can be used to study the effects of ultrasound on cell membranes and membrane proteins.
Yukun Xiang - One of the best experts on this subject based on the ideXlab platform.
-
Disintegration of waste activated sludge by a combined treatment of alkaline-modified eggshell and Ultrasonic Radiation
Journal of Environmental Chemical Engineering, 2017Co-Authors: Yulin Xiang, Yukun Xiang, Lipeng WangAbstract:Abstract In order to improve disintegration performance of waste activated sludge, alkaline-modified eggshell and Ultrasonic Radiation were introduced. Eggshell was subjected to modification treatment to produce calcium oxide (CaO). The calcium oxide was characterized by X-ray diffraction (XRD) and thermogravimetric analysis (TGA). XRD patterns showed CaO intense peaks. TGA profile indicated the components of eggshell were constant at above 850 °C. The alone and combined treatment effects of alkaline-modified eggshell and Ultrasonic Radiation on the disintegration of waste activated sludge were studied. The combination of alkaline-modified eggshell and Ultrasonic Radiation treatment processes could enhanced the disintegration of waste activated sludge. Optimum conditions were pH of 12, Ultrasonic power of 330 W, and disintegration time of 15 min for the combined treatment process. The disintegration efficiency of waste activated sludge reached 45% under the optimized condition. The combined process of alkaline-modified eggshell and Ultrasonic Radiation was effective and feasible to disintegrate waste activated sludge.
