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  • Wiley  (4)
  • 1
    In: Angewandte Chemie, Wiley, Vol. 131, No. 49 ( 2019-12-02), p. 17998-18006
    Abstract: Metal halide perovskites have emerged as a new generation of X‐ray detector materials. However, large‐sized MAPbI 3 single crystals (SCs) still exhibit lower performance than MAPbBr 3 SCs in X‐ray detection. DFT (density functional theory) simulations suggest the problem could be overcome by alloying large‐sized cations at the A site. The alloyed process could notably decrease the electron–phonon coupling strength and increase the material defect formation energy. Accordingly, centimeter‐sized alloyed DMAMAPbI 3 (DMA=dimethylammonium) and GAMAPbI 3 (GA=guanidinium) SCs are obtained. Electrical characterizations confirm the GAMAPbI 3 SCs display improved charge collection efficiency. It also exhibits a remarkable reduction of dark current, an important figure of merit for X‐ray detectors. With a judiciously designed device architecture, the overall detector performance confirms GAMAPbI 3 SCs as one of the most sensitive perovskite X‐ray detectors to date.
    Type of Medium: Online Resource
    ISSN: 0044-8249 , 1521-3757
    URL: Issue
    RVK:
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 505868-5
    detail.hit.zdb_id: 506609-8
    detail.hit.zdb_id: 514305-6
    detail.hit.zdb_id: 505872-7
    detail.hit.zdb_id: 1479266-7
    detail.hit.zdb_id: 505867-3
    detail.hit.zdb_id: 506259-7
    Location Call Number Limitation Availability
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  • 2
    Online Resource
    Online Resource
    Wiley ; 2019
    In:  Angewandte Chemie International Edition Vol. 58, No. 49 ( 2019-12-02), p. 17834-17842
    In: Angewandte Chemie International Edition, Wiley, Vol. 58, No. 49 ( 2019-12-02), p. 17834-17842
    Abstract: Metal halide perovskites have emerged as a new generation of X‐ray detector materials. However, large‐sized MAPbI 3 single crystals (SCs) still exhibit lower performance than MAPbBr 3 SCs in X‐ray detection. DFT (density functional theory) simulations suggest the problem could be overcome by alloying large‐sized cations at the A site. The alloyed process could notably decrease the electron–phonon coupling strength and increase the material defect formation energy. Accordingly, centimeter‐sized alloyed DMAMAPbI 3 (DMA=dimethylammonium) and GAMAPbI 3 (GA=guanidinium) SCs are obtained. Electrical characterizations confirm the GAMAPbI 3 SCs display improved charge collection efficiency. It also exhibits a remarkable reduction of dark current, an important figure of merit for X‐ray detectors. With a judiciously designed device architecture, the overall detector performance confirms GAMAPbI 3 SCs as one of the most sensitive perovskite X‐ray detectors to date.
    Type of Medium: Online Resource
    ISSN: 1433-7851 , 1521-3773
    URL: Issue
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 2011836-3
    detail.hit.zdb_id: 123227-7
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  • 3
    Online Resource
    Online Resource
    Wiley ; 2016
    In:  Journal of Clinical Laboratory Analysis Vol. 30, No. 5 ( 2016-09), p. 776-778
    In: Journal of Clinical Laboratory Analysis, Wiley, Vol. 30, No. 5 ( 2016-09), p. 776-778
    Abstract: Colonoscopy can assess disease activity and severity of ulcerative colitis (UC) accurately, but it is invasive and costly. Role of noninvasive biomarkers of intestinal inflammation in evaluation of patients with UC is not well understood. In this study, we assessed fecal eosinophil cationic protein (FECP), fecal myeloperoxidase (FMPO), and fecal calprotectin (FC) as surrogate markers of disease activity and severity in patients with UC, and then evaluated effect of the combination of these markers. Methods Sixty‐three UC patients and 59 cases of age‐matched controls were investigated. All patients underwent clinical, endoscopic, and histological assessment for disease activity and severity. Fecal samples were analyzed for FECP, FC, and FMPO. Results All three fecal biomarkers were elevated in patients compared with controls ( P = 0.000). Significant differences were found between inactive UC and controls ( P = 0.000). Cases with severe UC had significantly higher FECP levels than those with mild UC ( p 〈 0.05), but there were no significant differences in FC and FMPO levels among disease severity groups. All three biomarkers showed positive correlation with Ulcerative Colitis Activity Index (UCAI). The areas under the ROC curve of FECP, FC, and FMPO were 0.939, 0.783, and 0.785, respectively. Sensitivity and specificity of fecal biomarkers in assessing disease activity were FECP—88.46%, 89.47%; FC—80.77%, 68.42%; and FMPO—84.62%, 63.16%. Conclusions All three fecal biomarkers could be used as surrogate markers for assessing disease activity of UC, and FECP provided superior discrimination than FMPO and FC. Moreover, FECP could distinguish between mild disease and severe disease group.
    Type of Medium: Online Resource
    ISSN: 0887-8013 , 1098-2825
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2016
    detail.hit.zdb_id: 2001635-9
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  • 4
    Online Resource
    Online Resource
    Wiley ; 2020
    In:  Acta Geologica Sinica - English Edition Vol. 94, No. 5 ( 2020-10), p. 1635-1650
    In: Acta Geologica Sinica - English Edition, Wiley, Vol. 94, No. 5 ( 2020-10), p. 1635-1650
    Abstract: As a case study of spatial and temporal variations in earthquake stress drops between the 2008 Ms 8.0 Wenchuan and 2013 Ms 7.0 Lushan earthquakes, we computed 1828 stress‐drop values for earthquakes with magnitudes 1.7 ≤ M L ≤ 5.0 during an eight‐year time span before and after major earthquakes. We divide the study area into three subregions (the southern segment of the Longmen Shan fault zone; the southwestern junction of the Longmen Shan and Sichuan Basin; and the southwestern margin of the Sichuan Basin) and calculate individual event stress drops in each. The results show that regions of alternating high and low stress drop are found on either side of the southwestern segment of the Longmen Shan fault zone. During the two‐year period after the 2008 Ms 8.0 Wenchuan earthquake, the stress state of the southern Longmen Shan fault shows no significant change. A marked increase in stress level appears about 18 months before the 2013 Ms 7.0 Lushan earthquake near the Lushan hypocenter zone. Two months after the Ms 7.0 event, the stress drops suddenly attenuate, with significantly less seismic energy release per event. We find that changes in the patterns of high and low stress drop values are consistent with the process of stress accumulation or transfer from the pre‐mainshock to post‐mainshock periods. The results indicate that major earthquakes are the dominant cause of temporal and spatial evolution in stress levels. Stress drop variations show obvious temporal and spatial patterns that may suggests subtle changes in the character of stress fields on faults and spatial variations related to local intense compression and tectonic effects.
    Type of Medium: Online Resource
    ISSN: 1000-9515 , 1755-6724
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 2420386-5
    SSG: 6,25
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