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  • AIP Publishing  (4)
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  • AIP Publishing  (4)
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  • 1
    In: Applied Physics Letters, AIP Publishing, Vol. 110, No. 18 ( 2017-05-01)
    Abstract: In this study, the electrocaloric effect (ECE) of Bi0.5Na0.5TiO3–0.06BaTiO3 (BNT–0.06BT) ceramic has been directly measured using a home-made adiabatic calorimeter. The maximum adiabatic temperature change (ΔT) approaches 0.86 K under an electric field of 5 kV/mm at 110 °C, which provides experimental evidence for optimizing the ECE near the type–I pseudo–first–order phase transition (PFOPT). Most importantly, a considerable ΔT value can be maintained over a wide temperature range well above the temperature of the PFOPT under a high electric field. In addition, ΔT is closely related to the structural transition and electric field strength. This work provides a guideline to investigate the high ECE in BNT–based ferroelectric ceramics for applications in cooling technologies.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    RVK:
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 2
    Online Resource
    Online Resource
    AIP Publishing ; 2021
    In:  Journal of Renewable and Sustainable Energy Vol. 13, No. 4 ( 2021-07-01)
    In: Journal of Renewable and Sustainable Energy, AIP Publishing, Vol. 13, No. 4 ( 2021-07-01)
    Abstract: Variability and intermittency are the intrinsic nature of wind and solar resources. Expanded wind and solar power development in China requires a deeper understanding of their differences in variability and intermittency, both spatially and temporally. To address this issue, this study provides a systematic quantitative comparison of the variability and intermittency between wind and solar resources across China. Compared with wind resources, solar resources show regular spatial patterns and highly similar temporal characteristics. Solar resources usually have larger daily variation amplitudes (1.0–3.5 times) and are more intermittent (1.0–10.0 times) than wind resources in most regions. Solar resources fluctuate 1.0–8.0 times faster than wind resources in western Xinjiang, most of central and southern China, and north and east of northeast China. However, the variation rate of solar resources is approximately 0.1–0.5 times the wind resources in the Qinghai–Tibet plateau and East China Sea. In general, wind and solar resources fluctuate faster and are more intermittent in spring and autumn. Onshore wind resources are more variable and intermittent in the periods of 6:00–12:00 and 16:00–22:00. However, the variability and intermittency of offshore wind resources are weak and have very small intra-day changes compared with onshore wind resources. Solar resources are usually more variable and intermittent during the periods of 2–4 h after sunrise and 2–4 h before sunset. Furthermore, the intra-day changes in the variability and intermittency of solar resources are significantly greater than the inter-month changes. Those quantitative insights contribute to better and more efficiently mitigate the variability and intermittency of wind and solar resources.
    Type of Medium: Online Resource
    ISSN: 1941-7012
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2444311-6
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  • 3
    In: Journal of Applied Physics, AIP Publishing, Vol. 133, No. 1 ( 2023-01-07)
    Abstract: Muography is a rapidly developing and non-destructive tomographic technology that uses cosmic ray muons. Due to the natural presence and deeper penetration of cosmic ray muons, scientists have performed various pioneer studies in fields, such as customs security, the internal imaging of volcanoes, scientific archaeology, and others. With unique advantages, muography has gained increasing attention from archaeologists as a novel and innovative tool to investigate large-scale archaeological sites. This approach may be especially helpful for identifying endangered cultural relics and monuments. In the work, we employ a compact, rugged, and portable muon imaging system, CORMIS (COsmic Ray Muon Imaging System), deployed at up to six measurement locations to perform a case study of three-dimensional muography in Xi’an city, China. Cultural cities, such as Xi’an, have long histories and could benefit from innovative techniques used to investigate, conserve, and protect large historical sites. In this paper, we present in detail a high resolution survey on a rampart of a Xi’an defensive wall in demand of urgent protection. The survey data are carefully processed with advanced statistical methods newly introduced in muography, and the results indicate density anomalies inside the rampart with unprecedented levels of precision. The density anomalies are potential safety hazards and need to be eliminated as soon as possible. The successful implementation of this survey significantly encourages more engagement on the tangible application of high-precision 3D muography in archaeological investigations and protection projects around the world.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 4
    In: AIP Advances, AIP Publishing, Vol. 7, No. 8 ( 2017-08-01)
    Abstract: The pore structure plays an important role to understand methane adsorption, storage and flow behavior of geological materials. In this paper, the multi-tests including N2 adsorption, mercury intrusion porosimetry (MIP) and CT reconstruction have been proposed on Tashan lamprophyre samples. The main findings are listed: (1) The pore size distribution has a broad range ranging from 2-100000nm, among which the adsorption pores ( & lt;100nm) occupies the mainly specific surface areas and pore volume while the seepage pores ( & gt;100nm) only account for 34% of total pore volume. (2) The lamprophyre open pores are mainly slit-like/plate-like and ink-bottle-shaped pores on a two-dimensional level. The lamprophyre 3D pore structure shows more stochastic and anisotropic extension on the z axis to form a complex pore system on a three-dimensional level. (3) The closed pores ( & gt;647nm) occupy averaged 74.86% and 72.75% of total pores ( & gt;647nm) volume and specific surface area indicating a poor connectivity pore system. The revealed results provide basic information for understanding the abnormal methane emission reasons in similar geological conditions with lamprophyre invasions.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 2583909-3
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