The streaming potential coupling coefficient was measured on one sample brau1 at a salinity of 10 g l. This disambiguation page lists articles associated with the title coupling coefficient. The seismoelectric and selfpotential methods are showing promises to characterize both the vadose zone of the earth, hydrocarbon. I want to evaluate self inductance and mutual inductance between the coils then coupling coefficient. An accurate empirical expression is proposed for the measured coupling coefficients which predicts streaming potential coupling coefficients and zeta potential in the salinity range from 0. Coupling coefficient an overview sciencedirect topics. The coupling coefficient of a pair of coils is a measure of the magnetic effect passing. That said, the dependence of a key parameter, the streaming coupling coefficient, with the saturation remains highly debat. A simple equation is derived from neumanns equation for mutual inductance, which is then used to calculate the coupling coefficient. Meaning, pronunciation, translations and examples log in dictionary. Examination of a theoretical model of streaming potential coupling. Pdf measurement of streaming potential coupling coefficient in.
The piezoelectric coupling coefficient of a thickness mode resonatorbased on a longitudinal wave along the threedirectionis limited by the material coupling coefficient k t 2 e 33 2 c 33 d. It equals the ratio of the postsynaptic voltage response over the presynaptic voltage stimulus of two electrically coupled cells. In this study, we present value of streaming potential coupling coefficient in a carbonate rock saturated with various salinities of brine. Analysis of circuits with mutually coupled inductor. Their data are exceptionally good in terms of quality. Derive the equation of velocity modulation in klystron. Streaming potential coupling coefficient at saturation versus salinity for the berea sandstone.
Grajski, ryan tseng and chuck wheatley qualcomm incorporated san diego, ca, usa abstract looselycoupled lc wireless power transfer wpt offers unique, nextgeneration improvements in user experience, and product design and innovation towards the vision. Various efforts to improve the value of me coupling coefficient. We present measurements of the streaming potential coupling coefficient in intact sandstone samples saturated with nacl brines at. The key parameter for electrokinetic phenomena is the streaming potential coupling coefficient and therefore the zeta potential. Coupling coefficient definition of coupling coefficient. If an internal link led you here, you may wish to change the link to point directly to the intended article. A new core flooding system is used to measure simultaneously and, for the first time, both the relative permeability, the resistivity index and the streaming potential coupling coefficient in. The coupling coefficient of conversions between seismic waves and electromagnetic waves is a theoretically involved expression of frequency and streaming potential coupling coefficient. That said, the dependence of a key parameter, the streaming coupling coefficient, with the saturation remains highly debated. Petrophysical properties of saprolites from the oak.
An effective potential theory for transport coefficients across. Jaeger,1 and lukas chrostowski1 1department of electrical and computer engineering, university of british columbia, vancouver, bc v6t 1z4, canada. Streaming potential coupling coefficient versus water saturation. Uvadare digital academic repository examination of a.
The key parameter for those phenomena is the streaming potential coupling coefficient, which is, for example, dependent on the zeta potential of the interface of. Dear all i modelled a 3d spiral coil with two turns, of two different coil separated by distance. That is because of the potential division between two equal capacitors. Mutual inductance of two coils ceis caribbean energy. Measurement of streaming potential coupling coefficient in sandstones saturated with natural and artificial brines at high salinity. Effective potential theory for transport coefficients across coupling regimes. The balancer coil has to be layerwound so as not to decrease the coupling coefficient. A viewpoint on direct methane conversion to ethane and.
Streaming potential an overview sciencedirect topics. The symbols represent experimental data bull and gortner, 1932. Fiber bragg grating modeling yue qiu and yunlong sheng center for optics, photonics and laser laval university stefoy, quebec, g1k 7p4, canada contents 1. Recently luong and sprik published an article that compared measurements that had been made on 20 samples of saturated rock with a number of empirical models and the glover et al. Although the formulas used do not distinguish which coefficient is coupling and which is loss, it is shown how these coefficients can be disentangled based on how they vary with wavelength or device. The thermal coupling coefficient matrix will have nn number of columns and rows where n is the number of different boundary conditions with a specified temperature. Mutual inductance calculator learning about electronics. Mann and owens 17 investigated a nonlinear electromagnetic energy harvester with a bistable potential well. Coupling coefficient definition of coupling coefficient by. Measurement of the streaming potential coupling coefficient for a. Using free software such as ltspice a filter can easily be analyzed with any amount of coupling between the inductors in the filter, but ltspice needs the coefficient of coupling between each inductor pair to do the analysis. Vadose zone journal abstract original research streaming. The seismoelectric and selfpotential methods are showing promises to characterize both the vadose zone of the earth, hydrocarbon reservoirs and co 2 sequestration. A method is developed for extracting the coupling and loss coefficients of ring resonators from the peak widths, depths, and spacings of the resonances of a single resonator.
Mar 20, 2018 various efforts to improve the value of me coupling coefficient. Two coils are taken coil a and coil b, when current flows through one coil it produces flux. A comparison of methods to measure the coupling coefficient of. As we expected, streaming potential in such core is small but measurable and higher salinity gives smaller streaming potential coupling coefficient. Comment on examination of a theoretical model of streaming.
Coupling changes the filter response in a generally undesirable way. The subscript i indicates the position of the neuron in the network, d is the coupling coefficient between adjacent neurons via electric synapse coupling, d. Coupling coefficient definition and meaning collins. Coupling factor between coils or when the coefficient of coupling, k is equal to 1, unity such that all the lines of flux of one coil cuts all of the turns of the other, the mutual inductance is equal to the geometric mean of the two. The amount of mutual inductance that links one coil to another depends very much on the. Precise control of the coupling coefficient through. Investigation of streaming potential coupling coefficients. Streaming potential coupling coefficient in unsaturated.
Dec 20, 2010 the helmholtzsmoluchowski hs equation is commonly used to relate the streaming potential coupling coefficient of rocks to their zeta potential, pore fluid dielectric permittivity, conductivity, and viscosity despite it being known for almost 80 years that it does not work well for porous media. The steadystate coupling coefficient for direct current dc stimuli i. Relative streaming potential coupling coefficient versus saturation. Read measurement of streaming potential coupling coefficient in sandstones saturated with high salinity nacl brine, geophysical research letters on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at. Streaming potential coupling coefficient in unsaturated carbonate. Download scientific diagram measurement of the streaming potential coupling coefficient for a core sample from the dam. The mutual inductance calculator calculates the mutual inductance of 2 inductors with a coupling coefficient of k, according to the formula shown above. The seismoelectric and self potential methods are showing promises to characterize both the vadose zone of the earth, hydrocarbon reservoirs and co 2 sequestration. Streaming potential coupling coefficient of quartz glass bead. Pdf streaming potential coupling coefficient in unsaturated. Coupling coefficient definition and meaning collins english. Precise control of the coupling coefficient through destructive interference in silicon waveguide bragg gratings xu wang,1,2, yun wang,1 jonas flueckiger,1 richard bojko,3 amy liu,2 adam reid,2 james pond,2 nicolas a.
Magnetoelastic coupling in a potential ferromagnetic 2d atomic crystal. Jan 03, 2014 dear all i modelled a 3d spiral coil with two turns, of two different coil separated by distance. An accurate empirical expression is proposed for the measured coupling coefficients which predicts streaming potential coupling coefficients and zeta potential in. Jun 17, 2014 in this paper, we analyze the coupling coefficient as a function of the distance between two planar and coaxial coils in wireless energy transfer systems. Analytical formulae for the coupling coefficient beta. Frequencydependent streaming potential in a porous transducer. We also developed new scaling laws for the permeability, the streaming potential coupling coefficient and the capillary entry pressure of porous media. Analytical formulae for the coupling coefficient,o between a waveguide and a travelling wave structure j. Pdf streaming potential coupling coefficient of quartz. The theory is developed for frequencies much below the critical frequency at which inertial effects starts to dominate in the navierstokes equation 10 khz. The sensitivity coefficient s i is the normalized measure of the impact of the rate.
This time independent schrodinger equation is then considered for two potentials coupled by a moving \delta potential. The inductance result which is displayed above is in unit. The helmholtzsmoluchowski hs equation is commonly used to relate the streaming potential coupling coefficient of rocks to their zeta potential, pore fluid dielectric permittivity, conductivity, and viscosity despite it being known for almost 80 years that it does not work well for porous media. They found that none of the empirical models could reproduce the streaming potential coefficient. In this paper, we analyze the coupling coefficient as a function of the distance between two planar and coaxial coils in wireless energy transfer systems. Measurement of the electrokinetic coupling coefficient for various rock samples is one of the critical.
The reversal potential of the pump should correspond to the membrane potential against which the pump can no longer translocate a net charge i. Barrere exality corporation a transformer with individual winding inductances l1 and l2 has mutual inductance m between the windings. Saturation was achieved with nacl brines with salinities ranging from 2. Jan 22, 2018 the subscript i indicates the position of the neuron in the network, d is the coupling coefficient between adjacent neurons via electric synapse coupling, d 0 describes the field interaction. The value of the streaming potential coupling coefficient remained constant and was not affected by the backpressure. In the following, the effect of salinity upon the streaming potential coupling coefficient c is discussed at first in saturated condition and then in unsaturated conditions. Resonant inductive coupling or magnetic phase synchronous coupling is a phenomenon with inductive coupling where the coupling becomes stronger when the secondary loadbearing side of the loosely coupled coil resonates. Differential pairs in pcb transmission lines sierra circuits. Collective responses in electrical activities of neurons.
Comparison between experimental data and the prediction of our model associated with the van genuchten model. Equivalent circuits of mutually coupled inductors as was already mentioned in the second topic, when the magnetic field of one coil reaches a second. Coupling coefficient, or coupling factor, may refer to. We focus on pointing out the inherent obstacles in the development of the catalytic ocm technology by analyzing thermodynamic and kinetic features of the process. Bendtwist coupling potential of wind turbine blades.
Analysis of the coupling coefficient in inductive energy. A viewpoint on direct methane conversion to ethane and ethylene using oxidative coupling on solid catalysts. We measured the streaming potential coupling coefficient of natural saturated and unsaturated carbonate rocks. The coupling coefficient is the ratio of the opencircuit actual voltage ratio to the ratio that would obtain if all the flux coupled from one circuit to the other. A resonant transformer of this type is often used in analog circuitry as a bandpass filter. Magnetoelastic coupling in a potential ferromagnetic 2d. The coupling coefficient is a measure of synaptic strength of an electrical synapse. Streaming potential coupling coefficient of quartz glass. Dec 10, 2015 recently luong and sprik published an article that compared measurements that had been made on 20 samples of saturated rock with a number of empirical models and the glover et al. Seismoelectric coupling in unsaturated porous media. Streaming potential coupling coefficient and permeability for sample. When the coefficient of coupling, k is equal to 1, unity such that all the lines of flux of one coil cuts all of the turns of the second coil, that is the two coils are tightly coupled together, the resulting mutual inductance will be equal to the geometric mean of the two individual inductances of the coils. We study a kleingordonmaxwell system, in a bounded spatial domain, under neumann boundary conditions on the electric potential.
Amplitude coefficients a e, a o for even and odd modes and cumulative phase difference. Coupling coefficient article about coupling coefficient by. Examination of a theoretical model of streaming potential coupling coefficient. Nov 01, 2009 read measurement of streaming potential coupling coefficient in sandstones saturated with high salinity nacl brine, geophysical research letters on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Return loss and mutual coupling cofficient of a microstrip. There may be up to 20 different boundary temperature conditions giving a 2020 l2d matrix. Osa extracting coupling and loss coefficients from a.
Measurement of streaming potential coupling coefficient on. The experimental results show that streaming potential coefficient and streaming current. Coupling coefficient definition is an abstract number representing the degree in which the performance of either of two coupled systems influences that of the other. Analytical formulae for the coupling coefficient beta between. Measurement of streaming potential coupling coefficient in.
For sufficiently small data, we find infinitely many static solutions. The ratio of the maximum change in energy of an electron traversing an interaction space to the product of the peak alternating gap voltage and the. The electrokinetic effect in a molecular electronic system can be characterized by the streaming potential coupling coefficient, which is the ratio of. Kleingordonmaxwell systems with nonconstant coupling. The magnitude of the coupling coefficient increased with decreasing salinity, similarly to the trend observed for sandstones. Streaming potential coupling coefficient is obtained by the slope of linear regression through the plot of stabilized voltage verses pressure difference at different flow rates and the streaming potential coupling coefficient of the specific brine composition and silica particle sample can be determined by eq. By applying the developed method for analysis of a commercial wind turbine blade structure it is demonstrated that a bendtwist coupling magnitude of up to 0. A user enters the coupling coefficient, k, inductor l1, and inductor l2, and the result will automatically be calculated and shown. Osa extracting coupling and loss coefficients from a ring.
The first coil has n1 turns and carries a current i1 which gives rise to a magnetic field b1 g. Although the formulas used do not distinguish which coefficient is coupling and which is loss, it is shown how these coefficients can be disentangled based on how they vary with wavelength or device parameters. When the coefficient of coupling, k is equal to 1, unity such that all the lines of flux of one coil. The coupling coefficient is related to mutual inductance and self inductances in the following way. It is important for a balancer coil for coldcathode fluorescent lamps to have a high coupling coefficient between coils. Coupling coefficient article about coupling coefficient.
754 1409 798 1650 1514 974 1050 320 462 1537 267 1497 1391 1413 358 1550 378 1273 1094 406 1487 541 1432 1463 805 264 1302 153 289 791 1076 1113 493 926 1419