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Synthesis of 4-acylpyrazolone Schiff base ligand grafted silica and selectivity in adsorption of lanthanides from aqueous solutions

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Journal of Rare Earths 2009年第5期27卷 870-874页

作者： Ananda S.Amarasekara Onome S.Owereh sukesh k.aghara Department of Chemistry Prairie View A&M University Department of Chemical Engineering Prairie View A&M University

The Schiff base form of the 4-acylpyrazolone ligand was immobilized on the silica surface by reaction of 3-aminopropyl silica with 4-acetyl-5-methyl-2-phenyl-2,4-dihydro-pyrazol-3-one in 97% yield, producing grafted silica with 0.77 mmol/g ligand loading. This surface modified silica was shown to be selective in the adsorption of Yb3+ ions from dilute aqueous solutions, for which 98% adsorption was observed from a 1.0×10-5 mol/L aq. solution at pH 6.7, after 24 h at room temperature. Six other lanthanides studied Eu3+, Gd3+, Nd3+, Tb3+, Sm3+ and La3+ showed moderate to weaker adsorptions of 39%, 28%, 16%, 12%, 11% and 5% respectively under similar conditions.

关键词： 4-acylpyrazolone Schiff-base grafted-silica lanthanides adsorption rare earths

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An experimental investigation on pulse transit time and pulse arrival time using ecg, pressure and ppg sensors

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Medicine in Novel Technology and Devices 2023年第1期17卷 116-122页

作者： sukesh Rao M. Narendra k.C Adithi k. Sanith C.Bangera Department of Electronics and Communication Engineering NMAM Institute of TechnologyNitteNitte Deemed to be UniversityNitte-574110KarnatakaIndia Department of General Medicine K.S.Hegde Medical AcademyNitte Deemed to be UniversityMangaloreKarnatakaIndia

Pulse transit time(PTT)and pulse arrival time(PAT)are explored using multiple sensors connected to the human *** wave velocity(PWV)is indirectly computed using *** conducted a study using ECG,Pressure,and PPG sensor to capture the PAT and PTT information *** PAT and three PTT values were obtained from the *** electrocardiograph(ECG/EkG)is used as a reference signal for three PAT *** values were obtained using pressure and PPG sensors connected at the wrist and fingertip respectively.A pressure sensor module was constructed to measure PTT at the wrist and the results were compared with the other standard reference *** rate variability was found to be relatively lower in both ECG and PPG sensors as compared with pressure sensors at the *** PAT obtained from ECG and PPG sensor was found to have the least variation of 0:386±0:037 sec with 9.58% of the *** at the wrist captured using a pressure sensor was recorded to be 0:026±0:013 sec with 50% of the *** values measured using ECG and pressure sensor were found to be correlating with ECG and *** experimental result indicates different ranges of the PWV which indicates that the flow velocity of the blood varies with different *** can be effectively computed from pressure and PPG sensors,and this makes it possible to extract different pulse features in the wearable devices without the need of ECG signal or PAT as reference.

关键词： Pressure Sensor Pulse Artery Wrist Signal

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