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| 1 | Mn–Co–Ni–O thin films prepared by sputtering with alloy target显示文摘The thin film of heat-sensitive materials has been widely concerned with the current trend of miniaturization and integration of sensors.In this work,Mn1.56 Co0.96 Ni0.48 O4(MCNO)thin films were prepared on Si O2/Si substrates by sputtering with Mn–Co–Ni alloy target and then annealing in air at different temperatures(650–900℃).The X-ray diffraction(XRD)and field emission scanning electron microscopy(FE-SEM)analysis indicated that the main crystalline phase of MCNO thin films was spinel crystal structure;the surface of the thin films was very dense and uniform.The electrical properties of the thin films were studied in the temperature range of–5–50℃.The MCNO thin film with a low room temperature resistance R25 of 71.1 kΩand a high thermosensitive constant B value of 3305 K was obtained at 750℃.X-ray photoelectron spectroscopy(XPS)analysis showed that the concentration of Mn3+and Mn4+cations in MCNO thin films is the highest when annealing temperature is 750℃.The complex impedance analysis revealed internal conduction mechanism of the MCNO thin film and the resistance of the thin film was dominated by grain boundary resistance. | Ruifeng LI Qiuyun FU Xiaohua ZOU Zhiping ZHENG Wei LUO Liang YAN | 2020 | Journal of Advanced Ceramics2020，9，1： | 3 |
| 2 | Active device detection and performance analysis of massive non-orthogonal transmissions in cellular Internet of Things显示文摘This paper investigates multiple access schemes for uplink and downlink transmissions in cellular networks with massive Internet of Things(IoT) devices. Recall that single-carrier frequency division multiple access and orthogonal frequency division multiple access, which are orthogonal multiple access(OMA) schemes, have been conventionally adopted for uplink and downlink transmissions in narrow-band IoT, respectively. Unlike these OMA schemes, we propose two non-orthogonal multiple access(NOMA)schemes for cellular IoT with short-packet transmissions. Especially, a generalized expectation consistent signal recovery-based algorithm is proposed to estimate active devices, channel state information and data in uplink transmission, where all of the active devices are allowed to transmit their pilots and data through the same resource block without authorization. On the other hand, the active devices estimated during uplink transmission are grouped for downlink transmission with a trade-off between performance and detection complexity. Additionally, the data error rates are analysed for both uplink and downlink transmissions with low-resolution analog-to-digital converters(ADCs), where the effects of critical parameters such as the estimation error, ADC bits, packet length, and message bits are revealed. Both simulation and analytical results are provided to demonstrate the excellent performance of the proposed NOMA schemes and algorithms, especially for active device, channel, and data estimations. More importantly, the obtained results show that the data error rate performance of downlink NOMA is superior to that of OMA when the message bits of devices in one group are selected following the proposed strategy. | Donghong CAI Pingzhi FAN Qiuyun ZOU Yanqing XU Zhiguo DING Zhiquan LIU | 2022 | Science China(Information Sciences)2022，65，8： | 1 |
| 3 | Starspot periodicity and magnitude can be used to search for extrasolar planets显示文摘 | Qiuyun Liu Yiqi Li Juntong Zou Fan Yang Xiang Zhu | 2016 | 校园英语2016，，28： | 0 |
| 4 | Regulating local electric field to optimize the energy storage performance of antiferroelectric ceramics via a composite strategy显示文摘Electrostatic energy storage technology based on dielectrics is the basis of advanced electronics and high-power electrical systems.High polarization(P)and high electric breakdown strength(Eb)are the key parameters for dielectric materials to achieve superior energy storage performance.In this work,a composite strategy based on antiferroelectric dielectrics(AFEs)has been proposed to improve the energy storage performance.Here,AlN is selected as the second phase for the(Pb_(0.915)Ba_(0.04)La_(0.03))(Zr_(0.65)Sn_(0.3)Ti_(0.05))O_(3)(PBLZST)AFEs,which is embedded in the grain boundaries to construct insulating networks and regulate the local electric field,improving the Eb.Meanwhile,it is emphasized that AFEs have the AFE–FE and FE–AFE phase transitions,and the increase of the phase transition electric fields can further improve the recoverable energy density(Wrec).As a result,the Eb increases from 180 to 290 kV·cm−1 with a simultaneous increase of the phase transition electric fields,magnifying the Wrec to~144%of the pristine PBLZST.The mechanism for enhanced Eb and the phase transition electric fields is revealed by the finite element simulation method.Moreover,the PBLZST:1.0 wt%AlN composite ceramics exhibit favorable temperature stability,frequency stability,and charge–discharge ability,making the composite ceramics a promising candidate for energy storage applications. | Ying Yang Zhanming Dou Kailun Zou Kanghua Li Wei Luo Wen Dong Guangzu Zhang Qiuyun Fu Shenglin Jiang | 2023 | Journal of Advanced Ceramics2023，12，3： | 0 |
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