scholarly journals Development of mathematical model of extraction from lupine with cheese serum by applying low-frequency mechanical vibrations

2019 ◽  
Vol 81 (1) ◽  
pp. 36-41 ◽  
Author(s):  
J. I. Shishatsky ◽  
A. M. Barbashin ◽  
S. A. Nickel
Keyword(s):  
Balance Equation ◽  
Atmospheric Pressure ◽  
Effective Diffusion ◽  
Low Frequency ◽  
Pressure Change ◽  
Mechanical Vibrations ◽  
Capillary Impregnation ◽  
Initial Stage ◽  
Impregnation Time ◽  
Substance Transfer

It is noted that the model is designed to create the largest possible pressure change in the cheese whey in the extractor, since the rate of transfer of the target components is proportional to the pressure difference at the ends of the capillaries. The mathematical description of impregnation as the main or important auxiliary operation is given in detail. The equations for the impregnated part of the capillary, the ratio of impregnation rates at different times are given. From the above dependencies, the equation Washburne regarding the time of impregnation. The formulas for calculating the volume of extractant passed through the capillary, serum and forced out of the capillary air taking into account the viscous resistance of the latter. After integration of the equation of the speed of capillary impregnation of the obtained expression allows to estimate the final value of the impregnation in the initial stage. For different cases of capillary impregnation expressions are written at atmospheric pressure, vacuuming and overpressure. The introduction of dimensionless values allowed to simplify the solution and to obtain an expression for calculating the time of pore impregnation. The analysis of the equation of dimensionless impregnation time taking into account the application of low-frequency mechanical vibrations is made. It is noted that the processes of impregnation and extraction occur simultaneously, so the impregnation time is often neglected, which impoverishes the understanding of the physics of the process, reduces the accuracy of the calculation. Taking into account the diffusion unsteadiness of the process of substance transfer due to hydrodynamic unsteadiness, the equation containing the effective diffusion coefficient is written. The equation of unsteady diffusion for a spherical lupine particle in a batch extractor is supplemented with initial and boundary conditions. Taking into account the balance equation, the kinetic equation of the process is obtained. We studied the distribution of pores in the particle lupine along the radii and squares, the calculated value of the porosity of the particle. The values of De and Bi are determined by the method of graphical solution of the balance equation, the equation of kinetics and the parameters included in these equations. Conclusions on the work.

The driving frequency effects on the atmospheric pressure corona jet plasmas from low frequency to radio frequency

2011 ◽  
Vol 18 (4) ◽  
pp. 043503 ◽  
Author(s):  
Dan Bee Kim ◽  
H. Jung ◽  
B. Gweon ◽  
S. Y. Moon ◽  
J. K. Rhee ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Atmospheric Pressure ◽  
Low Frequency ◽  
Driving Frequency ◽  
Frequency Effects

Association between atmospheric pressure change and variceal bleeding

2000 ◽  
Vol 118 (4) ◽  
pp. A966
Author(s):  
Rafal Sadurski ◽  
Peter B. Cotton ◽  
Michael B. Wallace
Keyword(s):  
Variceal Bleeding ◽  
Atmospheric Pressure ◽  
Pressure Change

Continental shelf waves and their influence on the circulation around the Great Barrier Reef

1983 ◽  
Vol 34 (1) ◽  
pp. 23 ◽  
Author(s):  
E Wolanski ◽  
AF Bennett
Keyword(s):  
Continental Shelf ◽  
Great Barrier Reef ◽  
Sea Level ◽  
Atmospheric Pressure ◽  
Low Frequency ◽  
Internal Tides ◽  
Wind Component ◽  
Barrier Reef ◽  
Longshore Current ◽  
Shelf Waves

Winds and atmospheric pressure, sea level and water currents were measured at several locations over the continental shelf, both east and west of the Great Barrier Reef, between 14.5�s. and 20�S., from June to November 1980. The dominant wind direction changed from westward over the Coral Sea to north- westward (roughly parallel to the shore) over the shelf. A strong non-tidal low-frequency signal in all sea- level and longshore current data was found, highly coherent from site to site and strongly correlated with the longshore wind component over the shelf, though not with the atmospheric pressure. A model of wind- driven barotropic shelf waves is used to explain a number of observations, such as the invariance of temporal fluctuations of longshore current with distance from shore, and the northward longshore propagation of oceanic disturbances at a speed equal to twice that of the first-mode barotropic free shelf wave, a speed one order of magnitude smaller than that of the wind system. The low-frequency current fluctuations resulted in large water displacements, up and down the coast. Low-frequency cross-shelf currents were much weaker and less coherent. Two upwelling mechanisms are internal tides and internal Kelvin waves coupled to the barotropic shelf waves.

A Study of the Response of a Small Porous Chamber to Forced Oscillation

1966 ◽  
Vol 88 (1) ◽  
pp. 25-32
Author(s):  
R. L. Peskin ◽  
E. Martinez
Keyword(s):  
Phase Angle ◽  
High Frequency ◽  
Gas Flow ◽  
Low Frequency ◽  
Pressure Change ◽  
Analytical Investigation ◽  
Frequency Curve ◽  
Cylindrical Chamber ◽  
Gas Damping ◽  
Vibrating Systems

An analytical investigation of the pressure response to forced volume oscillations of a shallow cylindrical chamber with a porous end is undertaken. Investigation is in the frequency domain. Both infinite and finite-length chambers are considered. The irreversible gas flow introduces a frequency-dependent phase angle between volume and pressure change. Pressure leads volume at low frequency, and the phase angle becomes zero at high frequency. Curve characteristics suggest applications such as gas damping of vibrating systems.

scholarly journals Hidden role of intermolecular proton transfer in the anomalously diffuse vibrational spectrum of a trapped hydronium ion

2017 ◽  
Vol 114 (24) ◽  
pp. E4706-E4713 ◽  
Author(s):  
Stephanie M. Craig ◽  
Fabian S. Menges ◽  
Chinh H. Duong ◽  
Joanna K. Denton ◽  
Lindsey R. Madison ◽  
...  
Keyword(s):  
Proton Transfer ◽  
Low Frequency ◽  
Zero Point ◽  
Binding Pocket ◽  
Strongly Coupled ◽  
Hydronium Ion ◽  
Initial Stage ◽  
Intermolecular Proton Transfer ◽  
Symmetrical Configuration ◽  
Background Absorption

We report the vibrational spectra of the hydronium and methyl-ammonium ions captured in the C3v binding pocket of the 18-crown-6 ether ionophore. Although the NH stretching bands of the CH3NH3+ ion are consistent with harmonic expectations, the OH stretching bands of H3O+ are surprisingly broad, appearing as a diffuse background absorption with little intensity modulation over 800 cm−1 with an onset ∼400 cm−1 below the harmonic prediction. This structure persists even when only a single OH group is present in the HD2O+ isotopologue, while the OD stretching region displays a regular progression involving a soft mode at about 85 cm−1. These results are rationalized in a vibrationally adiabatic (VA) model in which the motion of the H3O+ ion in the crown pocket is strongly coupled with its OH stretches. In this picture, H3O+ resides in the center of the crown in the vibrational zero-point level, while the minima in the VA potentials associated with the excited OH vibrational states are shifted away from the symmetrical configuration displayed by the ground state. Infrared excitation between these strongly H/D isotope-dependent VA potentials then accounts for most of the broadening in the OH stretching manifold. Specifically, low-frequency motions involving concerted motions of the crown scaffold and the H3O+ ion are driven by a Franck–Condon-like mechanism. In essence, vibrational spectroscopy of these systems can be viewed from the perspective of photochemical interconversion between transient, isomeric forms of the complexes corresponding to the initial stage of intermolecular proton transfer.

Plasma Grafit Polymerized Styrene as an Electron-beam Resist

1998 ◽  
Vol 544 ◽  
Author(s):  
Shinzo Morita ◽  
Shinji Ogawa ◽  
Mikinori Suzuki ◽  
Md. Abul Kashem
Keyword(s):  
Electron Beam ◽  
Plasma Polymerization ◽  
Quartz Crystal ◽  
Low Frequency ◽  
Electrode System ◽  
Pulsed Plasma ◽  
Pulse Modulation ◽  
Plate Electrode ◽  
Initial Stage ◽  
Pulsed Plasma Polymerization

AbstractPlasma graft polymerized styrene was formed by a reactor with a parallel plate electrode system on a pulsed plasma polymerized styrene film in a monomer vapor, where the pulsed plasma polymerization was performed by a low frequency 100%pulse modulation of 13.56 MHz power source in styrene vapor. The pulse duration was varied in the range of 0.01∼1 sec and ON time/duty cycle ratio was 1/10 and 1/20. The processes were monitored by a quartz crystal microbalance. The initial stage of plasma polymerization and grafting are discussed in this paper. Also sub 100 nm lines and spaces pattern on the resist delineated by an electron-beam pattering machine was developed by hexane.

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