Instrument for alternating current impedance measurements

1983 ◽  
Vol 55 (1) ◽  
pp. 161-163 ◽  
Author(s):  
Sheng Min. Cai ◽  
Tadeusz. Malinski ◽  
Xiang Qin. Lin ◽  
Jian Quan. Ding ◽  
Karl M. Kadish
Keyword(s):  
Alternating Current ◽  
Impedance Measurements

scholarly journals ELECTRIC IMPEDANCE OF SINGLE MARINE EGGS

1938 ◽  
Vol 21 (5) ◽  
pp. 591-599 ◽  
Author(s):  
Kenneth S. Cole ◽  
Howard J. Curtis
Keyword(s):  
Preliminary Data ◽  
Sea Water ◽  
Membrane Conductance ◽  
Glass Tube ◽  
Alternating Current ◽  
Electric Impedance ◽  
Frequency Range ◽  
Impedance Measurements ◽  
Membrane Capacity ◽  
Thin Walled

Alternating current impedance measurements have been made on several single marine eggs over the frequency range from 1 to 2500 kilocycles per second. The eggs were placed in the center of a short capillary made by heating the end of a 2 mm. thin walled glass tube until it nearly closed, and electrodes were placed in the sea water on each side of the egg. When it is assumed that the membrane conductance is negligible, the membrane capacity and internal resistances of unfertilized and fertilized Arbacia eggs agree with the values obtained from suspensions. Preliminary data on centrifugally separated half Arbacia eggs, and whole Cumingia and Chaetopterus eggs are given.

Comparison of Electrical Resistance and Impedance Measurements in Wood in Progressive Stages of Discoloration and Decay

1973 ◽  
Vol 3 (4) ◽  
pp. 593-595 ◽  
Author(s):  
Terry A. Tattar ◽  
George C. Saufley
Keyword(s):  
Direct Current ◽  
Electrical Resistance ◽  
Alternating Current ◽  
Pulsed Current ◽  
Impedance Measurements ◽  
Direct Current Resistance ◽  
Current Resistance

Direct current resistance and alternating current impedance were used to detect and quantify wood in progressive stages of discoloration and decay in living trees. Results were comparable to those obtained with pulsed current under similar conditions.

A note on the use of impedance measurements for the prediction of carcass composition in lambs

1988 ◽  
Vol 47 (2) ◽  
pp. 311-315 ◽  
Author(s):  
J. R. Cosgrove ◽  
J. W. B. King ◽  
D. A. Brodie
Keyword(s):  
Consumer Demand ◽  
Accurate Method ◽  
Alternating Current ◽  
Carcass Composition ◽  
Classification Methods ◽  
Prediction Equations ◽  
Impedance Measurements ◽  
Trained Personnel

The absence of a simple, accurate method of lamb carcass composition assessment presents difficulties in satisfying an increasing consumer demand for leaner meat. Present carcass classification methods, depending on visual appraisal by trained personnel, may be perceived as subjective and consequently little support for the scheme is found within the industry. Ten carcasses of varying weight (19·9 (s.d. 5·9) kg) and side concentration of fat (303·61 (s.d. 102·70) g/kg) were assessed for impedance to the flow of an alternating current (800μΛ at 50Hz) by use of an impedance analyser. Impedance measurements were highly repeatable (> 0·90) and prediction equations for side concentration of fat and lean produced residual s.d.s of 23·25 to 18·80 g/kg and 37·10 to 18·55 g/kg respectively. Impedance measurements may provide an inexpensive, accurate and simple means of assessing lamb carcass composition

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