The Experts below are selected from a list of 73266 Experts worldwide ranked by ideXlab platform
Qibing Pei - One of the best experts on this subject based on the ideXlab platform.
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transparent ultra high loading quantum dot polymer nanocomposite monolith for Gamma scintillation
ACS Nano, 2017Co-Authors: Chao Liu, Tibor Jacob Hajagos, David Kishpaugh, Dustin Chen, Qibing PeiAbstract:Spectroscopic Gamma-Photon detection has widespread applications for research, defense, and medical purposes. However, current commercial detectors are either prohibitively expensive for wide deployment or incapable of producing the characteristic Gamma photopeak. Here we report the synthesis of transparent, ultra-high-loading (up to 60 wt %) CdxZn1–xS/ZnS core/shell quantum dot/polymer nanocomposite monoliths for Gamma scintillation by in situ copolymerization of the partially methacrylate-functionalized quantum dots in a monomer solution. The efficient Forster resonance energy transfer of the high-atomic-number quantum dots to lower-band-gap organic dyes enables the extraction of quantum-dot-borne excitons for Photon production, resolving the problem of severe light yield deterioration found in previous nanoparticle-loaded scintillators. As a result, the nanocomposite scintillator exhibited simultaneous improvements in both light yield (visible Photons produced per MeV of Gamma-Photon energy) and Gamma ...
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Transparent Ultra-High-Loading Quantum Dot/Polymer Nanocomposite Monolith for Gamma Scintillation
2017Co-Authors: Chao Liu, Tibor Jacob Hajagos, David Kishpaugh, Dustin Yuan Chen, Qibing PeiAbstract:Spectroscopic Gamma-Photon detection has widespread applications for research, defense, and medical purposes. However, current commercial detectors are either prohibitively expensive for wide deployment or incapable of producing the characteristic Gamma photopeak. Here we report the synthesis of transparent, ultra-high-loading (up to 60 wt %) CdxZn1–xS/ZnS core/shell quantum dot/polymer nanocomposite monoliths for Gamma scintillation by in situ copolymerization of the partially methacrylate-functionalized quantum dots in a monomer solution. The efficient Förster resonance energy transfer of the high-atomic-number quantum dots to lower-band-gap organic dyes enables the extraction of quantum-dot-borne excitons for Photon production, resolving the problem of severe light yield deterioration found in previous nanoparticle-loaded scintillators. As a result, the nanocomposite scintillator exhibited simultaneous improvements in both light yield (visible Photons produced per MeV of Gamma-Photon energy) and Gamma attenuation. With these enhancements, a 662 keV Cs-137 Gamma photopeak with 9.8% resolution has been detected using a 60 wt % quantum-dot nanocomposite scintillator, demonstrating the potential of such a nanocomposite system in the development of high-performance low-cost spectroscopic Gamma detectors
Chao Liu - One of the best experts on this subject based on the ideXlab platform.
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transparent ultra high loading quantum dot polymer nanocomposite monolith for Gamma scintillation
ACS Nano, 2017Co-Authors: Chao Liu, Tibor Jacob Hajagos, David Kishpaugh, Dustin Chen, Qibing PeiAbstract:Spectroscopic Gamma-Photon detection has widespread applications for research, defense, and medical purposes. However, current commercial detectors are either prohibitively expensive for wide deployment or incapable of producing the characteristic Gamma photopeak. Here we report the synthesis of transparent, ultra-high-loading (up to 60 wt %) CdxZn1–xS/ZnS core/shell quantum dot/polymer nanocomposite monoliths for Gamma scintillation by in situ copolymerization of the partially methacrylate-functionalized quantum dots in a monomer solution. The efficient Forster resonance energy transfer of the high-atomic-number quantum dots to lower-band-gap organic dyes enables the extraction of quantum-dot-borne excitons for Photon production, resolving the problem of severe light yield deterioration found in previous nanoparticle-loaded scintillators. As a result, the nanocomposite scintillator exhibited simultaneous improvements in both light yield (visible Photons produced per MeV of Gamma-Photon energy) and Gamma ...
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Transparent Ultra-High-Loading Quantum Dot/Polymer Nanocomposite Monolith for Gamma Scintillation
2017Co-Authors: Chao Liu, Tibor Jacob Hajagos, David Kishpaugh, Dustin Yuan Chen, Qibing PeiAbstract:Spectroscopic Gamma-Photon detection has widespread applications for research, defense, and medical purposes. However, current commercial detectors are either prohibitively expensive for wide deployment or incapable of producing the characteristic Gamma photopeak. Here we report the synthesis of transparent, ultra-high-loading (up to 60 wt %) CdxZn1–xS/ZnS core/shell quantum dot/polymer nanocomposite monoliths for Gamma scintillation by in situ copolymerization of the partially methacrylate-functionalized quantum dots in a monomer solution. The efficient Förster resonance energy transfer of the high-atomic-number quantum dots to lower-band-gap organic dyes enables the extraction of quantum-dot-borne excitons for Photon production, resolving the problem of severe light yield deterioration found in previous nanoparticle-loaded scintillators. As a result, the nanocomposite scintillator exhibited simultaneous improvements in both light yield (visible Photons produced per MeV of Gamma-Photon energy) and Gamma attenuation. With these enhancements, a 662 keV Cs-137 Gamma photopeak with 9.8% resolution has been detected using a 60 wt % quantum-dot nanocomposite scintillator, demonstrating the potential of such a nanocomposite system in the development of high-performance low-cost spectroscopic Gamma detectors
Olga Kocharovskaya - One of the best experts on this subject based on the ideXlab platform.
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nuclear quantum memory and time sequencing of a single Gamma Photon
arXiv: Quantum Physics, 2018Co-Authors: Xiwen Zhang, R.n. Shakhmuratov, Wente Liao, Alexey Kalachev, Marlan O Scully, Olga KocharovskayaAbstract:A $\Gamma$-ray-nuclear quantum interface is suggested as a new platform for quantum information processing, motivated by remarkable progresses in $\Gamma$-ray quantum optics. The main advantages of a $\Gamma$ Photon over an optical Photon lie in its almost perfect detectability and much tighter, potentially sub-angstrom, focusability. Nuclear ensembles hold important advantages over atomic ensembles in a unique combination of high nuclear density in bulk solids with narrow, lifetime-broadening Mossbauer transitions even at room temperature. This may lead to the densest long-lived quantum memories and the smallest size Photon processors. Here we propose a technique for $\Gamma$ Photon quantum memory through a Doppler frequency comb, produced by a set of resonantly absorbing nuclear targets that move with different velocities. It provides a reliable storage, an on-demand generation, and a time sequencing of a single $\Gamma$ Photon. This scheme presents the first $\Gamma$-Photon-nuclear-ensemble interface opening a new direction of research in quantum information science.
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compression of the waveform of a Gamma Photon into a train of short pulses in an optically dense oscillating mossbauer absorber
Radiophysics and Quantum Electronics, 2017Co-Authors: V A Antonov, I R Khairulin, Y V Radeonychev, Olga KocharovskayaAbstract:We study the potential of a method for manipulating the spectral-temporal characteristics of the Mossbauer γ Photon on the basis of resonant interaction of the electromagnetic field of a single Photon with an oscillating nuclear absorber. It is shown that the absorber enrichment by a resonant nuclide and an increase in its optical density allow one to considerably increase the peak probability of detecting the Photon behind the absorber and improve the obtained-pulse shape. The estimates for the γ radiation of the Mossbauer nuclide 57Co with a Photon energy of 14.4 keV and a lifetime of 141 ns of the excited state, which interacts with the oscillating resonant absorber enriched by the 57Fe nuclei, are given and the possibility of compressing the waveform of an incident Photon into a train of pulses with durations of 10 ns and peak intensity two times exceeding that in the absence of the absorber is shown.
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slow Gamma Photon with a doublet structure time delay via a transition from destructive to constructive interference of collectively scattered radiation with the incoming Photon
Physical Review A, 2009Co-Authors: R.n. Shakhmuratov, Joseph Odeurs, Farit G. Vagizov, Olga KocharovskayaAbstract:Single Gamma Photon propagation in a dense absorptive medium with two widely spaced resonances is experimentally studied. After an initial fast decay, a revival of the Photon amplitude in the form of a bump, exceeding the probability amplitude of the incident Photon, is observed. The irradiation time of this bump delays approximately by the lifetime of the excited nuclei in the absorber. This effect is explained by the interference of the incoming radiation with the collectively scattered radiation, the phase of which is modulated with the frequency of the doublet splitting. Initially, the destructive interference changes to a constructive one, distinguishing the storage and retrieval stages of the Photon propagation in a dense medium, i.e., the collective absorption and collective re-emission processes.
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slow γ Photon with a doublet structure time delay via a transition from destructive to constructive interference of collectively scattered radiation with the incoming Photon
Physical Review A, 2009Co-Authors: R.n. Shakhmuratov, Joseph Odeurs, Farit G. Vagizov, Olga KocharovskayaAbstract:Single $\ensuremath{\Gamma}$ Photon propagation in a dense absorptive medium with two widely spaced resonances is experimentally studied. After an initial fast decay, a revival of the Photon amplitude in the form of a bump, exceeding the probability amplitude of the incident Photon, is observed. The irradiation time of this bump delays approximately by the lifetime of the excited nuclei in the absorber. This effect is explained by the interference of the incoming radiation with the collectively scattered radiation, the phase of which is modulated with the frequency of the doublet splitting. Initially, the destructive interference changes to a constructive one, distinguishing the storage and retrieval stages of the Photon propagation in a dense medium, i.e., the collective absorption and collective re-emission processes.
Juliann G Kiang - One of the best experts on this subject based on the ideXlab platform.
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combined therapy of pegylated g csf and alxn4100tpo improves survival and mitigates acute radiation syndrome after whole body ionizing irradiation alone and followed by wound trauma
Radiation Research, 2017Co-Authors: David L. Bolduc, Min Zhai, Juliann G Kiang, Joan T Smith, Marsha N Anderson, Connie Ho, Suping JiangAbstract:Exposure to ionizing radiation alone or combined with traumatic tissue injury is a crucial life-threatening factor in nuclear and radiological incidents. Radiation injuries occur at the molecular, cellular, tissue and systemic levels; their mechanisms, however, remain largely unclear. Exposure to radiation combined with skin wounding, bacterial infection or burns results in greater mortality than radiation exposure alone in dogs, pigs, rats, guinea pigs and mice. In the current study we observed that B6D2F1/J female mice exposed to 60Co Gamma-Photon radiation followed by 15% total-body-surface-area skin wounds experienced an increment of 25% higher mortality over a 30-day observation period compared to those subjected to radiation alone. Radiation exposure delayed wound healing by approximately 14 days. On day 30 post-injury, bone marrow and ileum in animals from both groups (radiation alone or combined injury) still displayed low cellularity and structural damage. White blood cell counts, e.g., neutrophi...
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combined therapy of pegylated g csf and alxn4100tpo improves survival and mitigates acute radiation syndrome after whole body ionizing irradiation alone and followed by wound trauma
Radiation Research, 2017Co-Authors: David L. Bolduc, Min Zhai, Juliann G Kiang, Joan T Smith, Marsha N Anderson, Bin Lin, Suping JiangAbstract:Exposure to ionizing radiation alone or combined with traumatic tissue injury is a crucial life-threatening factor in nuclear and radiological incidents. Radiation injuries occur at the molecular, cellular, tissue and systemic levels; their mechanisms, however, remain largely unclear. Exposure to radiation combined with skin wounding, bacterial infection or burns results in greater mortality than radiation exposure alone in dogs, pigs, rats, guinea pigs and mice. In the current study we observed that B6D2F1/J female mice exposed to 60Co Gamma-Photon radiation followed by 15% total-body-surface-area skin wounds experienced an increment of 25% higher mortality over a 30-day observation period compared to those subjected to radiation alone. Radiation exposure delayed wound healing by approximately 14 days. On day 30 post-injury, bone marrow and ileum in animals from both groups (radiation alone or combined injury) still displayed low cellularity and structural damage. White blood cell counts, e.g., neutrophils, lymphocytes, monocytes, eosinophils, basophils and platelets, still remained very low in surviving irradiated alone animals, whereas only the lymphocyte count was low in surviving combined injury animals. Likewise, in surviving animals from radiation alone and combined injury groups, the RBCs, hemoglobin, hematocrit and platelets remained low. We observed, that animals treated with both pegylated G-CSF (a cytokine for neutrophil maturation and mobilization) and Alxn4100TPO (a thrombopoietin receptor agonist) at 4 h postirradiation, a 95% survival (vehicle: 60%) over the 30-day period, along with mitigated body-weight loss and significantly reduced acute radiation syndrome. In animals that received combined treatment of radiation and injury that received pegylated G-CSF and Alxn4100TPO, survival was increased from 35% to 55%, but did not accelerate wound healing. Hematopoiesis and ileum showed significant improvement in animals from both groups (irradiation alone and combined injury) when treated with pegylated G-CSF and Alxn4100TPO. Treatment with pegylated G-CSF alone increased survival after irradiation alone and combined injury by 33% and 15%, respectively, and further delayed wound healing, but increased WBC, RBC and platelet counts after irradiation alone, and only RBCs and platelets after combined injury. Treatment with Alxn4100TPO alone increased survival after both irradiation alone and combined injury by 4 and 23%, respectively, and delayed wound healing after combined injury, but increased RBCs, hemoglobin concentrations, hematocrit values and platelets after irradiation alone and only platelets after combined injury. Taken together, the results suggest that combined treatment with pegylated G-CSF and Alxn4100TPO is effective for mitigating effects of both radiation alone and in combination with injury.
David Kishpaugh - One of the best experts on this subject based on the ideXlab platform.
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transparent ultra high loading quantum dot polymer nanocomposite monolith for Gamma scintillation
ACS Nano, 2017Co-Authors: Chao Liu, Tibor Jacob Hajagos, David Kishpaugh, Dustin Chen, Qibing PeiAbstract:Spectroscopic Gamma-Photon detection has widespread applications for research, defense, and medical purposes. However, current commercial detectors are either prohibitively expensive for wide deployment or incapable of producing the characteristic Gamma photopeak. Here we report the synthesis of transparent, ultra-high-loading (up to 60 wt %) CdxZn1–xS/ZnS core/shell quantum dot/polymer nanocomposite monoliths for Gamma scintillation by in situ copolymerization of the partially methacrylate-functionalized quantum dots in a monomer solution. The efficient Forster resonance energy transfer of the high-atomic-number quantum dots to lower-band-gap organic dyes enables the extraction of quantum-dot-borne excitons for Photon production, resolving the problem of severe light yield deterioration found in previous nanoparticle-loaded scintillators. As a result, the nanocomposite scintillator exhibited simultaneous improvements in both light yield (visible Photons produced per MeV of Gamma-Photon energy) and Gamma ...
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Transparent Ultra-High-Loading Quantum Dot/Polymer Nanocomposite Monolith for Gamma Scintillation
2017Co-Authors: Chao Liu, Tibor Jacob Hajagos, David Kishpaugh, Dustin Yuan Chen, Qibing PeiAbstract:Spectroscopic Gamma-Photon detection has widespread applications for research, defense, and medical purposes. However, current commercial detectors are either prohibitively expensive for wide deployment or incapable of producing the characteristic Gamma photopeak. Here we report the synthesis of transparent, ultra-high-loading (up to 60 wt %) CdxZn1–xS/ZnS core/shell quantum dot/polymer nanocomposite monoliths for Gamma scintillation by in situ copolymerization of the partially methacrylate-functionalized quantum dots in a monomer solution. The efficient Förster resonance energy transfer of the high-atomic-number quantum dots to lower-band-gap organic dyes enables the extraction of quantum-dot-borne excitons for Photon production, resolving the problem of severe light yield deterioration found in previous nanoparticle-loaded scintillators. As a result, the nanocomposite scintillator exhibited simultaneous improvements in both light yield (visible Photons produced per MeV of Gamma-Photon energy) and Gamma attenuation. With these enhancements, a 662 keV Cs-137 Gamma photopeak with 9.8% resolution has been detected using a 60 wt % quantum-dot nanocomposite scintillator, demonstrating the potential of such a nanocomposite system in the development of high-performance low-cost spectroscopic Gamma detectors
