scholarly journals Synthesis, Characterization and Electrical Admittance Study of LaCrO3 Perovskite Compound

2019 ◽  
Author(s):  
Mustafa Coskun
Keyword(s):  
Electrical Admittance

Detection of bark lesions caused by Phytophthoracinnamomi in Eucalyptusmarginata with the plant impedance ratio meter and the Shigometer

1987 ◽  
Vol 17 (10) ◽  
pp. 1228-1233 ◽  
Author(s):  
Joanna T. Tippett ◽  
Joanne L. Barclay
Keyword(s):  
Water Content ◽  
Electrical Resistance ◽  
Water Status ◽  
Healthy Tissue ◽  
Plant Tissues ◽  
Tissue Water Content ◽  
Tissue Water ◽  
Impedance Ratio ◽  
New Instrument ◽  
Electrical Admittance

A new instrument, the plant impedance ratio meter (PIRM), has been used to determine the extent of lesions caused by Phytophthoracinnamomi Rands in Eucalyptusmarginata Sm. The performance of the PIRM, which measures electrical admittance (the inverse of impedance) of plant tissues at two frequencies (from which an impedance ratio is calculated), was evaluated and compared with that of the Shigometer. The electrical admittance measured at 1 and 10 kHz (PIRM) and the electrical resistance (Shigometer) of healthy tissue varied with both the depth of tissue probed and the water status of stems. However, the impedance ratios (calculated from the admittance values) remained relatively constant for healthy tissue and changes were independent of depth of probing. Hence, changes in ratios indicated a change in tissue condition or necrosis rather than changes in either tissue water content or depth of probing. The impedance ratios recorded for healthy bark tissues were consistently higher than those for the P. cinnamomi lesions in E. marginata. Trends in electrical resistance measured across the boundaries of the lesions with the Shigometer were variable depending on lesion age. The PIRM was used successfully to detect P. cinnamomi lesions in E. marinate and lesion fronts were predicted to an accuracy of ± 7.2 mm (n = 150), lesions being up to 1.0 m long at the time stems were harvested.

Noninvasive Measurement of Hematocrit by Electrical Admittance Plethysmography Technique

1980 ◽  
Vol BME-27 (3) ◽  
pp. 156-161 ◽  
Author(s):  
Ken-Ichi Yamakoshi ◽  
Hideaki Shimazu ◽  
Tatsuo Togawa ◽  
Masakazu Fukuoka ◽  
Hiroshi Ito
Keyword(s):  
Noninvasive Measurement ◽  
Electrical Admittance ◽  
Admittance Plethysmography

Electrical Admittance Spectroscopy for Piezoelectric MEMS

2013 ◽  
Vol 22 (2) ◽  
pp. 295-302 ◽  
Author(s):  
Donghwan Kim ◽  
Nishshanka N. Hewa-Kasakarage ◽  
Sang H. Yoon ◽  
Karen D. Kirk ◽  
Michael Kuntzman ◽  
...  
Keyword(s):  
Admittance Spectroscopy ◽  
Electrical Admittance ◽  
Piezoelectric Mems

Peribronchial electrical admittance measures lung edema and congestion in the dog

1980 ◽  
Vol 49 (2) ◽  
pp. 337-341 ◽  
Author(s):  
J. E. McNamee ◽  
M. L. Brodman
Keyword(s):  
Pulmonary Edema ◽  
Electrical Impedance ◽  
Interstitial Fluid ◽  
Quantitative Measure ◽  
Lung Edema ◽  
Control Value ◽  
Interstitial Pulmonary Edema ◽  
Electrical Admittance ◽  
Peripheral Airway ◽  
Catheter Tip

A new method has been developed to detect interstitial pulmonary edema. This method utilizes the unique arrangement of air and interstitial fluid within the lung. A 1.3-mm-diam twin catheter electrode was wedged in a peripheral airway of the lung. The electrical impedance measured at 35 kHz between these catheter-tip electrodes was 1,540 ± 240 omega (mean ± SD; n = 10) in the anesthetized closed-chest dog. Intravenous infusion of 1-3 liters 0.154 M NaCl increased extravascular water per gram of dry lung from a control value of 3.54 ± 0.27 to 4.1-5.14. Peribronchial electrical impedance decreased in proportion to the amount of saline infused reaching a minimum of 550 omega. No signs of alveolar flooding were present during the experiments. Linear regression performed on peribronchial electrical admittance (PEA) as a function of extravascular water per gram of dry lung (ELW) resulted in the following relationship: PEA = 0.72 ELW - 1.81; r = 0.95. It is concluded that this method is a sensitive quantitative measure of lung interstitial fluid and can detect pulmonary edema and congestion in the dog lung before alveolar flooding occurs.

Fischerella sp. biomass measurement by using graphite electrodes

2019 ◽  
Vol 28 (6) ◽  
pp. 33-38
Author(s):  
José Martín Márquez-Villa ◽  
Juan Carlos Martínez-Espinosa ◽  
Juan Carlos Rodríguez-Sierra
Keyword(s):  
High Reliability ◽  
Electric Circuit ◽  
Dry Weight ◽  
Electrical System ◽  
Graphite Electrodes ◽  
Living Biomass ◽  
Electrical Admittance ◽  
Physical Quantities

For several decades, the electrical admittance has been very useful for the determination of physical quantities, such as the characterization of some electrical properties of interest in organic samples. In this work, an electrical system based on graphite electrodes to determine the amount of living biomass of the cyanobacteria Fischerella sp. is proposed. Cyanobacteria are phototrophic microorganisms with applications on bioremediation, pharmaceutics, medicine, among others. The strain was characterized in BG-11 medium and cultured at different biomass concentrations. Samples were evaluated by electrical admittance and contrasted by the technique of dry weight in order to correlate the results registered by the/a proposal electric circuit. Scanning frequencies from admittance went in an order from 10 Hz to 1 000 000 Hz. Also, they showed a reproducibility, getting deviations of 6.45 × 10-5. This electrical system can be used to evaluate Fischerella sp. living biomass concentrations with high reliability.

Evaluation of the Parallel Conductor Theory for Measuring Human Limb Blood Flow by Electrical Admittance Plethysmography

1982 ◽  
Vol BME-29 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Hideaki Shimazu ◽  
Ken-Ichi Yamakoshi ◽  
Tatsuo Togawa ◽  
Masakazu Fukuoka ◽  
Hiroshi Ito
Keyword(s):  
Blood Flow ◽  
Limb Blood Flow ◽  
Electrical Admittance ◽  
Admittance Plethysmography ◽  
Parallel Conductor ◽  
Human Limb
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