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3篇 您的检索式:作者名="Yaoqing Liu"
    题名 作者 年代 出处 被引量
1Photoluminescence spectra of nano-structured ZnO thin films显示文摘Yu Feng Yingxue Zhou Yaoqing Liu Guobin Zhang Xinyi Zhang 2006Journal of Luminescence2006,,:1
2Toward long-range adaptive communication via information centric networking显示文摘As Internet of Things(IoT)applications become more prevalent and grow in their use,a limited number of wireless communication methods may be unable to enable dependable,robust delivery of information.It is necessary to enable adaptive communication and interoperability over a variety of wireless communication media to meet the requirements of large-scale IoT applications.This paper utilizes Named Data Networking(NDN),an up-and-coming Information-Centric Network architecture,to interconnect differing communication links via the network layer,and implements dynamic forwarding strategies and routing mechanisms which aid in the efficient dissemination of information.This work targets the creation of an interface technique to allow NDN to be transported via LoRa.This is acheived via the coupling of LoRa and WiFi using the NDN Forwarding Daemon(NFD)to create a universal ad hoc network.This network has the capacity for high range and multi-hop Device-to-Device(D2D)communication together with compatibility with other network communication media.Testing of the system in a real environment has shown that the newly created ad hoc network is capable of communicating over a several kilometer radius,while making use of the features provided by NDN to capitalize upon various links available to enable the efficient dissemination of data.Furthermore,the newly created network leverages NDN features to enable content-based routing within the LoRa network and utilize content-based routing techniques.Anthony Dowling Lauren Huie Laurent Njilla Hong Zhao Yaoqing Liu 2021Intelligent and Converged Networks2021,2,1:0
3A new oxyapatite red phosphor Eu^(3+)-doped Ca_(3)Y_(7)(BO_(4))(SiO_(4))_(5)O:Synthesis,structure and luminescence properties显示文摘A series of new oxyapatite red phosphors Ca_(3) Y_(7)(BO_(4)) (SiO_(4))_(5) O doped with different concentrations of Eu^(3+)were successfully synthesized by high temperature solid state method.The X-ray diffraction(XRD)Rietveld refinement results show that the structure of the phosphor belongs to space group P6_(3)/m and Eu^(3+)ion replaces Y^(3+)ion.The emission spectrum consists of the characteristic emission peaks corresponding to Eu^(3+)under the excitation of 274 nm and the dominant emission peak is at 614 nm(^(5)D_(0)→^(7)F_(2) of Eu^(3+)).The concentration quenching effect occurs and the optimized Eu^(3+)concentration is 4.0 mol%.The energy level diagram for luminous mechanism is also given and the non-radiative energy transfer mechanism between Eu^(3+)is mainly exchange interaction.The CIE coordinate is close to the ideal red light and the color purity is higher than 99.79%.Moreover,the phosphor exhibits moderate thermal stability because the photoluminescence intensity at 423 K is still maintained at higher than 78.97%of that at room temperature.The internal quantum efficiency of Ca_(3) Y_(7)(BO_(4)) (SiO_(4))_(5) O:4.0 mol%Eu^(3+)phosphor is 58.2%.A red light emitting diode(LED)device based on it can emit bright red light.The CCT values of the device are basically unchanged when driven by various bias current.The results show that Ca_(3) Y_(7)(BO_(4)) (SiO_(4))_(5) O:Eu^(3+)is a new type of oxyapatite red fluorescent material with good comprehensive performances.Tian Tian Wei Liu Qi Liu Yan Zhang Yaoqing Chu Gan Liu Jiayue Xu 2022Journal of Rare Earths2022,40,5:0
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