Analysis, Synthesis, and Evaluation of the Transient Response of Television Apparatus

Bedford, A.V.; Fredendall, G.L.

doi:10.1109/jrproc.1942.232365

Cited by 15 publications

(3 citation statements)

References 4 publications

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“…Teorell [24] and Cuthbert and Painter [5,6] determined the parameters of the network from an approximate reconstruction of the frequency response by Fourier analysis [1], and a similar procedure was used here. Calculations were carried out with the aid of the University of Liverpool's (5) and (6) became zero.…”

Section: Analysis Ofmentioning

confidence: 99%

“…Analysis of exact responses plus error showed that this gave useful results (see below). The maximum frequency at which impedance can usefully be calculated is 1/2At; in fact, the accuracy of the method used here decreases at much lower frequencies [1]. The value of A t for the Fourier analysis was decreased by interpolation between adjacent values of Vt read from the oscilloscope traces; interpolation was also necessary to obtain an equally-spaced series of values from readings at the two sweep rates.…”

Section: Analysis Ofmentioning

confidence: 99%

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Aldosterone-induced moulting in amphibian skin and its effect on electrical capacitance

Smith

1975

J. Membrain Biol.

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The resistance and capacitance of the isolated amphibian skin have been determined from measurements of the response of the voltage across the skin to small steps to current. Previous work indicates that the electrical impedance of frog skin, when the skin is bathed with Ringer's solution on both sides, is largely determined by the properties of the functional outward-facing membrane of the skin, the outer membrane of the stratum granulosum (P.G. Smith, 1971, Acta Physiol. Scand. 81:355). This membrane can be represented by a resistance and capacitance in parallel. Aldosterone, which induces conversion of the s. granulosum into a cornified cell layer and transformation of the cell layer below into a new s. granulosum, also causes a transient rise in resistance and a short-lived decrease in capacitance to about one-half its initial value. It is suggested that these electrical changes are caused by the transitory presence of two functional outward-facing membranes in series. The method of determining resistance and capacitance from the voltage response is discussed in the Appendix.

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Section: Analysis Ofmentioning

confidence: 99%

Section: Analysis Ofmentioning

confidence: 99%

Aldosterone-induced moulting in amphibian skin and its effect on electrical capacitance

Smith

1975

J. Membrain Biol.

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“…6b shows the type used by us in our previous paper (Cuthbert & Painter, 1969). (Our method was similar to that employed by Bedford & Fredendall (1942) and did not employ the correction for phase shift recommended by Teorell (1946), but usually gave loci passing through R 00. We considered this essential since Roo was the most accurately determined point.)…”

Section: Appendixmentioning

confidence: 99%

Capacitance changes in frog skin caused by theophylline and antidiuretic hormone

Cuthbert

Painter

1969

British J Pharmacology

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. Impedance loci for frog skins have been calculated by computer analysis from voltage transients developed across the tissues. . Attention has been paid to simultaneous changes in conductance and capacitance of skins treated either with antidiuretic hormone (ADH) or with theophylline. These drugs always caused an increase in conductance and usually the skin capacitance also increased. However, changes in conductance were not correlated with capacitance changes. . Changes in capacitance caused by the drugs may represent pore formation in the barrier to water flow, since both drugs increase hydro‐osmotic flow in epithelia. If this interpretation is correct, then 0.14% of the membrane area forms water‐permeable pores in response to a maximal dose of ADH. This value is somewhat less than the value obtained previously (0.3%) by graphical analysis. . A theoretical account is given of the relative accuracy of the computer method and the graphical method for voltage transient analysis.

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Deflection Amplifiers

Czech¹

1965

Oscilloscope Measuring Technique

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Analysis, Synthesis, and Evaluation of the Transient Response of Television Apparatus

Cited by 15 publications

References 4 publications

Aldosterone-induced moulting in amphibian skin and its effect on electrical capacitance

Aldosterone-induced moulting in amphibian skin and its effect on electrical capacitance

Capacitance changes in frog skin caused by theophylline and antidiuretic hormone

Deflection Amplifiers

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