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  1. Article: Dramatically Enhanced Mechanical Properties of Nano-TiN-Dispersed n-Type Bismuth Telluride by Multi-Effect Modulation.

    Lin, Shengao / Li, Jing / Yan, Heng / Meng, Xianfu / Xiang, Qingpei / Jing, Hang / Chen, Xiaoxi / Yang, Chuting

    Materials (Basel, Switzerland)

    2024  Volume 17, Issue 8

    Abstract: Bismuth telluride ( ... ...

    Abstract Bismuth telluride (Bi
    Language English
    Publishing date 2024-04-22
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma17081919
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Stretchable thermoelectric generator for wearable power source and temperature detection applications

    Shi, Yaoguang / Lü, Xiaozhou / Xiang, Qingpei / Li, Jing / Shao, Xiaojun / Bao, Weimin

    Energy conversion and management. 2022 Feb. 01, v. 253

    2022  

    Abstract: Wearable thermoelectric generators are attracting tremendous interest due to their capability of converting the human body heat into electricity for powering electronics. In order to reduce the parasitic thermal resistance and enhance the efficiency of ... ...

    Abstract Wearable thermoelectric generators are attracting tremendous interest due to their capability of converting the human body heat into electricity for powering electronics. In order to reduce the parasitic thermal resistance and enhance the efficiency of the energy harvesting process, the compliance of the device is required by introducing stretchable structures or materials. Thus, in this work, we present a novel stretchable thermoelectric generator (STEG) with 50 pairs of bulk thermoelectric legs connected by the kirigami-inspired flexible electrodes. The device was fabricated by a sacrificial layer assisted soldering fabrication method and its generation performances were characterized under natural and forced convection, as well as constant temperature difference conditions, respectively. The results indicated that the generated power density of the STEG under convection was enhanced by improving the cold-side air velocity, and the power density of the device under constant temperature difference conditions could be promoted with order of magnitudes to 2.7 mW/cm² at ΔT = 50 K. Besides, the STEG features reliable during the cycling of 30 % tensile strain load and bending with a radius of 5 mm, respectively. Finally, various practical applications of the STEG were investigated including the wearable power supply and temperature detector for human proximity/contact testing and high-temperature alert. Our results demonstrate that the proposed STEG configuration displays high output performance that could be utilized for wearable electronics applications.
    Keywords administrative management ; air ; body temperature ; compliance ; convection ; electricity ; electronics ; energy conversion ; heat tolerance ; humans ; tensile strength ; thermoelectric generators
    Language English
    Dates of publication 2022-0201
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2000891-0
    ISSN 0196-8904
    ISSN 0196-8904
    DOI 10.1016/j.enconman.2021.115167
    Database NAL-Catalogue (AGRICOLA)

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  3. Article ; Online: Re-construction of a HPGe detector precise modeling for efficiency calibration.

    Zhang, Changfan / Hu, Guangchun / Zeng, Jun / Xiang, Qingpei / Guo, Xiaofeng / Gong, Jian

    Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

    2021  Volume 180, Page(s) 110059

    Abstract: High purity germanium (HPGe) detector is a preferred choice for determining the activity of the radioactive samples for nuclear diagnostics of Inertial Confinement Fusion (ICF) experiments. Although the amounts of the radiochemical sample are limited, ... ...

    Abstract High purity germanium (HPGe) detector is a preferred choice for determining the activity of the radioactive samples for nuclear diagnostics of Inertial Confinement Fusion (ICF) experiments. Although the amounts of the radiochemical sample are limited, activity measurement at a close distance between the detector window and the radioactive source is a feasible method. Efficiency calibration of gamma rays at a close distance from the surface of a HPGe detector is crucial. Considering the problem of the coincidence at a close distance, the alternative way is to construct a precise model of the HPGe detector and then to calculate efficiency accurately at an arbitrary distance from the surface of the HPGe detector using Monte Carlo method. In this paper, internal geometry and structure except for dead layers of the HPGe detector is obtained by X-ray radiography and 3D reconstruction. The optimal dead layers of the germanium crystal are determined by tracing the minimal sum squared residual (SSR) of gamma-ray efficiencies between calculations and measurements for standard planar sources. Nonhomogeneous distribution of the dead layer is supposed according to the inner structure on the Ge crystal. The final results show that the corrected model improves the accuracy of the calculated efficiencies.
    Language English
    Publishing date 2021-12-07
    Publishing country England
    Document type Journal Article
    ZDB-ID 1142596-9
    ISSN 1872-9800 ; 0883-2889 ; 0969-8043
    ISSN (online) 1872-9800
    ISSN 0883-2889 ; 0969-8043
    DOI 10.1016/j.apradiso.2021.110059
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    In stock of ZB MED Cologne/Königswinter

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    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
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  4. Article: Comprehensive performance prediction and power promotion for wearable thermoelectric generator with flexible encapsulation in practical application

    Liu, Youhong / Shi, Yaoguang / Li, Jing / Guo, Xiaofeng / Wang, Yancheng / Xiang, Qingpei / Guo, Simao / Ze, Rende / Zeng, Jun / Xiang, Yongchun / Hao, Fanhua

    Energy conversion and management. 2020 Sept. 15, v. 220

    2020  

    Abstract: With ability of converting the heat harvested from human body into electricity, the wearable thermoelectric generators (WTEGs) are attracting lots of interests for self-powered electronic devices. However, the output power density of the WTEG is limited ... ...

    Abstract With ability of converting the heat harvested from human body into electricity, the wearable thermoelectric generators (WTEGs) are attracting lots of interests for self-powered electronic devices. However, the output power density of the WTEG is limited for supplying the electronic devices. Therefore, the performance enhancement by optimal design of the developed WTEGs is needed. In this paper, a method of comprehensive modeling of a WTEG is proposed by considering all essential components and realistic boundary conditions. By solving the model with finite element modeling (FEM) method, the calculation performances agree well with experimental results at various temperature difference and load resistance. Through the temperature and voltage distribution of the WTEG obtained, the effects of side heat loss and heat conduction of the encapsulation are revealed. Besides, the impact of the thermal conductivity of encapsulation and the geometric dimensions of thermoelectric legs on the output performance are explored. Finally, the performance prediction results indicate that at the temperature difference of 15 K, the output power of the WTEG with optimized design can be improved about 598.1% with matched loading resistance compared to the device with original design.
    Keywords administrative management ; density ; design ; dimensions ; electric potential difference ; electricity ; electronic equipment ; encapsulation ; energy conversion ; finite element analysis ; geometry ; heat transfer ; humans ; models ; paper ; prediction ; temperature ; thermal conductivity ; thermoelectric generators
    Language English
    Dates of publication 2020-0915
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-light
    ZDB-ID 2000891-0
    ISSN 0196-8904
    ISSN 0196-8904
    DOI 10.1016/j.enconman.2020.113080
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: Oxygen implanted Ni/NiO exchange bias system: fabrication, structure and magnetic property.

    Fa, Tao / Chen, Tianxiang / Xiang, Qingpei / Yao, Shude

    Journal of nanoscience and nanotechnology

    2012  Volume 12, Issue 2, Page(s) 1059–1062

    Abstract: Ion implantation is used to build a nanometer scale anti-ferromagnetic (AFM) cluster embedded exchange bias (EB) system. Ni film with a thickness of 100 nm is deposited on the Si (100) substrate using magnetron sputtering, 140 keV O+ is chosen to implant ...

    Abstract Ion implantation is used to build a nanometer scale anti-ferromagnetic (AFM) cluster embedded exchange bias (EB) system. Ni film with a thickness of 100 nm is deposited on the Si (100) substrate using magnetron sputtering, 140 keV O+ is chosen to implant into the Ni film to form NiO AFM clusters, of which the size is estimated by X-ray diffraction based on synchrotron radiation (SR-XRD). By measuring hysteresis loop after field-cooling, significant shifts of loop along the applied field are observed. By increasing the implantation dose up to 3 x 10(17)/cm2 and annealing samples in N2 atmosphere, we discuss the origin of EB effect observed and the size confinement effect which lowers down the Néel temperature (T(N)) of NiO cluster to below room temperature.
    Language English
    Publishing date 2012-04-18
    Publishing country United States
    Document type Journal Article
    ISSN 1533-4880
    ISSN 1533-4880
    DOI 10.1166/jnn.2012.4265
    Database MEDical Literature Analysis and Retrieval System OnLINE

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