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Studies on long lasting optical properties of Eu^(2+) and Dy^(3+) doped di-barium magnesium silicate phosphors

Chinese Chemical Letters 2015年第9期26卷 1187-1190页

作者： ravi shrivastava Jagjeet Kaur Govt.VYT PG Autonomous College

Di-barium magnesium silicate phosphors doped with europium and dysprosium were prepared under a weak reducing atmosphere.X-ray diffraction pattern of the sample was also done that confirmed the proper preparation of the *** electron microscope（SEM） images confirmed that the sample has regular surface and uniform grain size *** studies of phosphorescence decay of Ba2MgSi2O7：Eu^2＋,Dy^3＋ phosphors with different concentration of Dy^3＋ were *** phosphor with 0.5/1.5 mol%of Eu/Dy,exhibited optimum green color afterglow *** emission is expected to arise due to transition of Eu^2＋ ions from any of the sublevels of 4f^65d^1 configuration to ^8S（7/2） level of the 4f7 *** a suitable trap depth,the trap concentration is expected to be proportional to the concentration of Dy^3＋.These traps are responsible for holding the charge career for a reasonable time,subsequently for increasing the time of ***,optimum Dy3＊ concentration produces the longer afterglow duration with higher intensity of luminescence *** depth were also calculated using thermoluminescence glow curve which was indicative of formation of traps suitable for long afterglow.

关键词： Phosphorescence XRD Persistence luminescence Trapping center

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Understanding and controlling the variables for stromal vascular fraction therapy

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World Journal of Stem Cells 2024年第8期16卷 784-798页

作者： Naveen Jeyaraman Sandeep shrivastava VR ravi Arulkumar Nallakumarasamy Aditya Pundkar Madhan Jeyaraman Department of Orthopaedics Datta Meghe Institute of Higher Education and ResearchWardha 442004MaharashtraIndia Regenerative Medicine Mother Cell Regenerative CentreTiruchirappalli 620017Tamil NaduIndia Department of Orthopaedics Jawaharlal Nehru Medical CollegeDatta Meghe Institute of Higher Education and ResearchWardha 442004MaharashtraIndia Department of Orthopaedics ACS Medical College and HospitalDr MGR Educational and Research InstituteChennai 600077Tamil NaduIndia

In regenerative medicine,the isolation of mesenchymal stromal cells(MSCs)from the adipose tissue’s stromal vascular fraction(SVF)is a critical area of *** review meticulously examines the isolation process of MSCs,starting with the extraction of adipose *** choice of liposuction technique,anatomical site,and immediate processing are essential to maintain cell *** delve into the intricacies of enzymatic digestion,emphasizing the fine-tuning of enzyme concentrations to maximize cell yield while preventing *** review then outlines the filtration and centrifugation techniques necessary for isolating a purified SVF,alongside cell viability assessments like flow cytometry,which are vital for confirming the efficacy of the isolated *** discuss the advantages and drawbacks of using autologous vs allogeneic SVF sources,touching upon immunocompatibility and logistical considerations,as well as the variability inherent in donor-derived *** choices,the selection between hypo-dermic needles vs liposuction cannulas,and the role of adipose tissue lysers in achieving cellular dissociation are evaluated for their impact on SVF *** protocols are also analyzed for their part in ensuring the integrity of the *** necessity for standardized MSC isolation protocols is highlighted,promoting reproducibility and successful clinical *** encourage ongoing research to deepen the understanding of MSC biology and therapeutic action,aiming to further the field of regenerative *** review concludes with a call for rigorous research,interdisciplinary collaboration,and strict adherence to ethical and regulatory standards to safeguard patient safety and optimize treatment outcomes with MSCs.

关键词： Mesenchymal stromal cells Stromal vascular fraction Adipose tissue Autologous stromal vascular fraction Stromal vascular fraction isolation

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TL Glow Curve Study, Kinetics, PL and XRD Analysis of Mn2+Doped CaAl2O4Phosphors

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Journal of Minerals and Materials Characterization and Engineering 2012年第11期11卷 1081-1084页

作者： Jagjeet Kaur Nemana Subramanyam Suryanarayana Beena Jaykumar Vikas Dubey ravi shrivastava Huma Nazli Baig Department of Physics Vishwanath Yadav Tamaskar Post Graduate Autonomous College Durg India

The present paper reports Thermoluminescence (TL) Glow curve of Mn2+ doped CaAl2O4 phosphor with different UV exposure time. The Glow peak shows general order kinetics and evaluation of kinetic parameters was done by peak shape method. Calculations of Trap Depth were done with Chen’s different methods and order of kinetics, activation energy and frequency factor are calculated. The recorded glow curve shifts towards higher temperature with increasing intensity as a function of UV exposure time until 30 minutes where it is seen that the peak shifts towards low temperature side and intensity also decreases. The peaks were found at 345?C, 356.83?C, 358?C and 356.73?C respectively using the heating rate 6.7?C/s. The PL (photoluminescence) excitation spectra show peaks at 248 nm and 362 nm whereas emission spectra shows peaks between 364 nm and 551 nm. Sample was characterized by XRD technique.

关键词： Phosphors Photoluminescence Thermoluminescence Kinetic Parameters Trap Depth

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Assessment of bone condition by acoustic emission technique: A review

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Journal of Biomedical Science and Engineering 2009年第3期2卷 144-154页

作者： Sharad shrivastava ravi Prakash Birla Institute of Technology and Science Pilani India.

The paper deals with the review of acoustic emission technique in biomedical field. The re-view is done with the aim to provide an overview of the use of AE technique in biomedical field, mainly concentrated on the AE behavior of bone under different loading conditions, its depend-ence on strain rate, in osteoporosis, monitoring the fracture healing process of bone. The over-all conclusion from the review was that almost all the studies in bone indicated that the initial AE occurs only in the plastic region and just prior to yield. That means the use of AE tech-nique for clinical application cannot be consid-ered as a safe technique, but the early occur-rence of AE events from callus promises the application of AE technique for monitoring the fracture healing process. The negligible effect of soft tissues on AE response of bone prom-ises AE to become a non-invasive method for assessment of bone condition.

关键词： Acoustic Emission Assessment Strain Rate Callus Fracture Healing Osteoporosi

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