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"reactance inversion" at low frequencies in a child undergoing treatment of a cystic fibrosis exacerbation

Pediatric Investigation 2019年第4期3卷 257-260页

作者： Julian Lewis Allen Clement L.Ren Joseph McDonough Charles C.Clem Division of Pulmonary Medicine The Children's Hospital of PhiladelphiaPhiladelphiaPAUSA Riley Hospital for Children Indiana University School of MedicineIndianapolisIndianaUSA

Introduction:Impulse oscillometry(IOS)employs high frequency sinusoidal or impulse pressure and flow waveforms to interrogate the mechanical properties of the respiratory *** has special applications to preschool and younger children who may have difficulty performing the repetitive forced expiratory maneuvers required for *** presentation:We present a case illustrating improvements of respiratory system mechanics measured by IOS in a 6-year-old child with cystic fibrosis(CF)who demonstrated clinical and radiological improvement after a course of therapy with hospitalization and intravenous antibiotics,and initiation of a cystic fibrosis transmembrane regulator(CFTR)protein corrector/potentiator *** also report a new finding:observed lower than expected reactance at low compared to high frequencies("reactance inversion").Conclusion:reactance inversion may reflect parallel pathway inhomogeneities in resistance and elastance or intrabreath airway inertance changes in young children with *** study is needed in children with airway obstruction due to asthma,cystic fibrosis,and chronic lung disease of infancy to demonstrate the prevalence of this finding and whether it is specific to a measurement device.

关键词： Cystic fibrosis Exacerbation Impulse oscillometry reactance reactance inversion

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CALCULATION OF SATURABLE LEAKAGE reactanceS OF SQUIRREL CAGE ASYNCHRONOUS MOTORS

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Journal of Southeast University(English Edition) 1991年第2期7卷 66-75页

作者：钱巍 Department of Electrical Engineering

A general method of calculating the saturable leakage reactances of squirrelcage asynchronous motors is *** method synthesized the variety of effectswhich affect the saturation of leakage magnetic *** the saturable reactances canbe precisely evaluated in any running *** computation results of Y-series mo-tors are in good agreement with the test ones.

关键词： squirrel cage asynchronous motors/magnetic circuit saturation leakage reactance

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Impedance analysis of Labisia pumila plant water status

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Information Processing in Agriculture 2015年第3期2卷 161-168页

作者： Diyana Jamaludin Samsuzana Abd Aziz Desa Ahmad Hawa Z.E.Jaafar Department of Biological and Agricultural Engineering Faculty of EngineeringUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Department of Crop Science Faculty of AgricultureUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia

Labisia pumila(Kacip fatimah)is a popular medicinal plant in *** constituents of this plant have been reported to possess anticancer,antioxidant and anti-inflammatory *** growth and production of *** is greatly influenced by the plant water *** techniques to measure plant water status are generally based on the plant soil moisture,which apparently did not indicate the real water content inside the *** are other techniques to measure directly on the plant such as based on leaf water potential(LWP)and relative water content(RWC).However,these techniques are destructive and time *** this study,four levels of evapotranspiration replacement(ER)treatment which were 100%ER,75%ER,50%ER and 25%ER was applied to 30 polybags of *** *** plant water status was measured using an impedance spectroscopy technique.A pair of electrocardiogram(ECG)electrode connected to an impedance analyzer board was used to measure the impedance value of the leaf samples *** water status parameters such as LWP,RWC,volumetric moisture content(VMC),and leaf thickness were measured using standard *** results show that after 20 weeks of treatment,25%ER had the highest impedance value ranged from 0.10 MX to 0.15 MX at the frequency of 70–100 *** resistance of 100%ER at 20 weeks of treatment increased from 0.70 kX to 1.23 kX as the reactance decreased from 0.51 kX to 0.28 ***,the resistance of 25%ER increased from 1 kX to 1.10 kX as the reactance decreased from 0.88 kX to 0.83 *** polynomial regression of impedance measurements with plant water status parameters(VMC,leaf thickness,LWP and RWC)shows that LWP and RWC had the highest R2(0.78,0.73).The results show that impedance measurement technique is auspicious to evaluate plant water status.

关键词： Impedance spectroscopy Plant water status Labisia pumila Impedance reactance Resistance

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Drinking a Structured Water Product on Markers of Hydration,Airway Health and Heart Rate Variability in Thoroughbred Racehorses:a Small-scale,Clinical Field Trial

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Veterinary Science Research 2020年第1期2卷 1-15页

作者： Michael Ivan Lindinger Foster Northrop The Nutraceutical Alliance BurlingtonONCanada Northrop Equine LouisvilleKYUSA

Racehorses in training are in situations of repeated stress that may have effects on hydration and *** was hypothesized that daily consumption of a structured water(SW)product for 4 weeks will result in improved hydration,improved upper airway health and increased heart rate *** groups of Thoroughbred racehorses matched for physiological,training and racing attributes were studied for 4 *** group(n=17)received 10 L(about 15%)of their daily water as SW(followed by ad libitum filtered deep well water)and the control group(n=15)only filtered deep well *** samples and bioelectrical impedance analysis(BIA)measures were obtained at baseline,2 and 4 *** was assessed using *** upper airway was assessed by nasopharyngeal endoscopy at baseline and weekly within 60 minutes of *** weekly breeze days heart rate was recorded at rest,during exercise and recovery and data were analysed for heart rate *** to controls,horses drinking SW showed increased hydration improved upper airway health post-breezing and increased heart rate *** is concluded that drinking 10 L daily of SW increased hydration and may have conferred some wellness benefits.

关键词： Heart rate variability Bioelectrical impedance analysis Upper airway reactance Phase angle Resistance BIA

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New “Intellectual Networks” (Smart Grid) for Detecting Electrical Equipment Faults, Defects and Weaknesses

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Smart Grid and Renewable Energy 2012年第3期3卷 159-164页

作者： Alexander Yu. Khrennikov Federal Grid Company of United Energy System Moscow Russia.

The most important elements of “intellectual networks” (Smart Grid) are the systems of monitoring the parameters of electrical equipment. Information-measuring systems (IMS), which described in this paper, were proposed to use together with rapid digital protection against short-circuit regimes in transformer windings. This paper presents an application’s experience of LVI-testing, some results of the use of Frequency Response Analysis (FRA) to check the condition of transformer windings and infra-red control results of electrical equipment. The LVI method and short-circuit inductive reactance measurements are sensitive for detecting such faults as radial, axial winding deformations, a twisting of low-voltage or regulating winding, a losing of winding’s pressing and others.

关键词： Intellectual Networks Smart Grid Monitoring System Electrical Equipment Information-Measuring System Frequency Response Analysis Transformer Winding Fault Diagnostic Low Voltage Impulse Method Short-Circuit Inductive reactance Measurement

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