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学者姓名：王如志
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摘要 ：
微通道散热器在集成电路中具有重要应用,但目前传统的长直微通道散热过程导致温度不均匀,散热效率较低.本文设计了一种周期性分流微结构并与传统微通道进行集成,实现了一种高效率的周期性分流微通道散热器.基于以上周期性分流微通道,系统研究了单根微通道内微结构数目、微结构的排布方式及结构参数对其散热性能的影响.结果表明,引入的分流微结构可增大换热面积、打破原有层流边界层、促进冷/热冷却液混合、显著改善微通道散热性能.在100 W/cm2的热流密度下,入口端冷却液流速为1.18 m/s时,单根微通道内引入9组微结构后,其最高温度下降约24 K,热阻下降约44%,努塞尔数增大约124%,整体传热性能(PEC)...
关键词 ：
微通道 微通道 周期性分流 周期性分流 散热结构 散热结构
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| GB/T 7714 | 王晗 , 袁礼 , 王超 et al. 周期性分流微通道的结构设计及散热性能 [J]. | 物理学报 , 2021 , 70 (10) : 200-211 . |
| MLA | 王晗 et al. "周期性分流微通道的结构设计及散热性能" . | 物理学报 70 . 10 (2021) : 200-211 . |
| APA | 王晗 , 袁礼 , 王超 , 王如志 . 周期性分流微通道的结构设计及散热性能 . | 物理学报 , 2021 , 70 (10) , 200-211 . |
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摘要 ：
为了提高锂离子电池剩余使用寿命预测的精度,提出了一种基于随机参数机制差分进化(random parameter machine differential evolution,RPMDE)算法与多核支持向量机(multi-kernel support vector machine,MKSVM)的锂离子电池剩余使用寿命预测模型.首先,将差分变异策略和随机搜索算子引入差分进化算法中来增强算法种群多样性,提高全局搜索能力.然后,通过RPMDE算法优化MKSVM的惩罚因子和核参数来提高预测模型的精度.最后,利用美国国家航空航天局的锂离子电池测试数据验证RPMDE-MKSVM模型的准确性.实验结果表明,相比于差分进化算法模型和粒子群优化算法模型,RPMDE-MKSVM模型不仅具有更快的收敛速度,而且具有更优的预测精度.
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| GB/T 7714 | 简献忠 , 韦进 , 王如志 . 基于RPMDE-MKSVM的锂离子电池剩余使用寿命预测 [J]. | 控制工程 , 2021 , 28 (4) : 665-671 . |
| MLA | 简献忠 et al. "基于RPMDE-MKSVM的锂离子电池剩余使用寿命预测" . | 控制工程 28 . 4 (2021) : 665-671 . |
| APA | 简献忠 , 韦进 , 王如志 . 基于RPMDE-MKSVM的锂离子电池剩余使用寿命预测 . | 控制工程 , 2021 , 28 (4) , 665-671 . |
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摘要 ：
服务机器人激光测距组件的环境可靠性模型及其定量评价方法研究
关键词 ：
可靠性 可靠性 激光测距组件 激光测距组件 服务机器人 服务机器人 测距精度 测距精度 定量评价 定量评价
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| GB/T 7714 | 杨孟骐 , 赵爽 , 白晓帆 et al. 服务机器人激光测距组件的环境可靠性模型及其定量评价方法研究 [J]. | 杨孟骐 , 2021 , 42 (1) : 108-115 . |
| MLA | 杨孟骐 et al. "服务机器人激光测距组件的环境可靠性模型及其定量评价方法研究" . | 杨孟骐 42 . 1 (2021) : 108-115 . |
| APA | 杨孟骐 , 赵爽 , 白晓帆 , 王如志 , 仪器仪表学报 . 服务机器人激光测距组件的环境可靠性模型及其定量评价方法研究 . | 杨孟骐 , 2021 , 42 (1) , 108-115 . |
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摘要 ：
服务机器人行业发展迅速,其核心零部件激光测距组件可靠性直接影响整机性能。本文基于服务机器人的应用环境,对激光测距组件工作特性进行研究,建立了测距组件普适的环境可靠性模型及其试验评价方法。以测距精度作为研究对象,以可靠性评价因子R_s作为评价指标,提出了测距组件可靠性函数通用表达式。采用自主搭建的测距精度检测平台,对5种型号的组件样品进行了测距精度环境可靠性试验及定量评价。评价结果显示仅有1款样品的R_s值小于1,表明其环境可靠性水平较高;其他4款样品在防水防尘及盐雾试验后的R_s均大于1,存在失准或失效现象,暴露了产品在设计及应用中的薄弱环节。试验及评价结果进一步验证了环境可靠性模型及其定量评...
关键词 ：
可靠性 可靠性 定量评价 定量评价 服务机器人 服务机器人 测距精度 测距精度 激光测距组件 激光测距组件
引用：
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| GB/T 7714 | 杨孟骐 , 赵爽 , 白晓帆 et al. 服务机器人激光测距组件的环境可靠性模型及其定量评价方法研究 [J]. | 仪器仪表学报 , 2021 , 42 (01) : 108-115 . |
| MLA | 杨孟骐 et al. "服务机器人激光测距组件的环境可靠性模型及其定量评价方法研究" . | 仪器仪表学报 42 . 01 (2021) : 108-115 . |
| APA | 杨孟骐 , 赵爽 , 白晓帆 , 王如志 . 服务机器人激光测距组件的环境可靠性模型及其定量评价方法研究 . | 仪器仪表学报 , 2021 , 42 (01) , 108-115 . |
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摘要 ：
近年来,层状钙钛矿材料中存在的非常规铁电性为新型铁电体设计提供了新的途径.基于第一性原理,本文系统研究了具有Ruddlesden-Popper (RP)(n=2)结构的Sr_3B_2Se_7 (B=Zr, Hf)化合物的基态结构、电子结构和非常规铁电性.研究表明, Sr_3B_2Se_7 (B=Zr, Hf)基态均为具有A2_1am极性相的直接带隙半导体;其非常规铁电性来源于BSe_6八面体的两种旋转模式的耦合.而且,因具有较强的铁电极化值与可见光吸收带隙, Sr_3B_2Se_7 (B=Zr, Hf)有望成为新一代铁电光伏材料.
关键词 ：
Ruddlesden-Popper Ruddlesden-Popper 第一性原理 第一性原理 铁电光伏 铁电光伏 非常规铁电 非常规铁电
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| GB/T 7714 | 王朝 , 张铭 , 张持 et al. n=2 Ruddlesden-Popper Sr_3B_2Se_7(B=Zr,Hf)非常规铁电性的第一性原理研究 [J]. | 物理学报 , 2021 , 70 (11) : 276-282 . |
| MLA | 王朝 et al. "n=2 Ruddlesden-Popper Sr_3B_2Se_7(B=Zr,Hf)非常规铁电性的第一性原理研究" . | 物理学报 70 . 11 (2021) : 276-282 . |
| APA | 王朝 , 张铭 , 张持 , 王如志 , 严辉 . n=2 Ruddlesden-Popper Sr_3B_2Se_7(B=Zr,Hf)非常规铁电性的第一性原理研究 . | 物理学报 , 2021 , 70 (11) , 276-282 . |
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摘要 ：
针对压缩感知在电能质量信号压缩重构方面存在前期稀疏处理过程繁琐、观测矩阵设计困难、压缩重构速度慢等缺点,首次提出一种基于生成对抗网络模型的电能质量信号压缩重构方法.该网络模型由生成器和鉴别器组成.生成器学习样本分布的特性,经过训练后应用到电能质量信号的压缩和重构过程中.鉴别器与生成器相互对抗以提高彼此性能.此外,该方法在原损失函数中加入重构损失和频域损失,进一步提升重构效果.实验结果表明,提出的压缩重构方法不仅避免了前期对信号进行稀疏处理,而且具有重构效果好、重构速度快、稳定性更强的优势.
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| GB/T 7714 | 简献忠 , 王绪涛 , 王如志 . 基于生成对抗网络的电能质量信号压缩重构方法 [J]. | 控制工程 , 2021 , 28 (8) : 1654-1661 . |
| MLA | 简献忠 et al. "基于生成对抗网络的电能质量信号压缩重构方法" . | 控制工程 28 . 8 (2021) : 1654-1661 . |
| APA | 简献忠 , 王绪涛 , 王如志 . 基于生成对抗网络的电能质量信号压缩重构方法 . | 控制工程 , 2021 , 28 (8) , 1654-1661 . |
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摘要 ：
周期性分流微通道的结构设计及散热性能
关键词 ：
周期性分流 周期性分流 微通道 微通道 散热结构 散热结构
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| GB/T 7714 | 王晗 , 袁礼 , 王超 et al. 周期性分流微通道的结构设计及散热性能 [J]. | 王晗 , 2021 , 70 (10) : 194-205 . |
| MLA | 王晗 et al. "周期性分流微通道的结构设计及散热性能" . | 王晗 70 . 10 (2021) : 194-205 . |
| APA | 王晗 , 袁礼 , 王超 , 王如志 , 物理学报 . 周期性分流微通道的结构设计及散热性能 . | 王晗 , 2021 , 70 (10) , 194-205 . |
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摘要 ：
The (002) oriented GaN nanostructured films prepared by pulsed laser deposition (PLD) on n-type Si (100) substrates were treated by H- and O-plasma, finding both treatments do not make the sizable changes in crystalline structure and morphology of GaN nanofilms. However, the field emission (FE) performance of GaN nanofilms is considerably improved by H-plasma treatment (H-GaN) but deteriorated by O-plasma treatment (O-GaN). The turn-on fields, Eon, for H- and O-plasma treated GaN nanofilms are determined to be 0.52 and 1.79 V μm−1, respectively, in contrast with that of pristine GaN nanofilms, 0.95 V μm−1. The improvement of FE performance by the H-plasma treatments could be attributed to the reasons of the reduced surface potential barrier, the increased electron concentration, the increased surface conductivity, and the increased effective emission area. The first-principles calculations represents that the experimental and theoretical work function results have the same trend with the descending sequence of O-plasma treated GaN > pristine GaN > the H-plasma treated GaN. © 2021 IOP Publishing Ltd
关键词 ：
Calculations Calculations Field emission Field emission Gallium nitride Gallium nitride Hydrogen Hydrogen III-V semiconductors III-V semiconductors Morphology Morphology Plasma applications Plasma applications Pulsed laser deposition Pulsed laser deposition Silicon Silicon Surface potential Surface potential
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| GB/T 7714 | Song, Zhi-Wei , Wang, Changhao , Guo, Gen-Cai et al. Field emission of GaN nanofilms on Si substrates enhanced by hydrogen plasma treatment [J]. | Surface Topography: Metrology and Properties , 2021 , 9 (1) . |
| MLA | Song, Zhi-Wei et al. "Field emission of GaN nanofilms on Si substrates enhanced by hydrogen plasma treatment" . | Surface Topography: Metrology and Properties 9 . 1 (2021) . |
| APA | Song, Zhi-Wei , Wang, Changhao , Guo, Gen-Cai , Yang, Meng-Qi , Liang, Qi , Wang, Bo et al. Field emission of GaN nanofilms on Si substrates enhanced by hydrogen plasma treatment . | Surface Topography: Metrology and Properties , 2021 , 9 (1) . |
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摘要 ：
Recently, perovskite ferroelectric photovoltaic materials have been studied extensively. Traditional photovoltaic device usually uses the internal electric field formed by PN junction to realize the separation of photogenerated carriers to form the photovoltaic effect, while ferroelectric material, due to the existence of spontaneous polarization, can spontaneously realize the separation of photogenerated electrons and holes without the formation of PN junction, presenting the ferroelectric photovoltaic effect. Chalcogenide perovskite with suitable band gap and visible light absorption is expected to be a new generation of ferroelectric photovoltaic materials. However, its application is limited due to the lack of ferroelectric properties. Hybrid improper ferroelectricity (HIF) in layered perovskites has opened a new way for developing the new ferroelectrics. In contrast to the proper ferroelectricity in which the polarization is the main order parameter as the driving force, the improper ferroelectricity possesses the ferroelectric polarization that becomes a secondary order parameter induced by other orders. In this work, we study the ground state, electronic structure and hybrid improper ferroelectricity of n = 2 Ruddlesden-Popper (RP) Sr3B2Se7 (B = Zr, Hf) based on the first principles. The total energy calculations and phonon spectrum analysis show that the ground state of Sr3B2Se7 (B = Zr, Hf) is of A2(1)am polar phase. The hybrid improper ferroelectricity originates from the coupling between two rotation modes of BSe6 octahedron. Electronic structure calculations show that Sr3Zr2Se7 and Sr3Hf2Se7 are semiconductors with direct band-gaps, which are around 1.56 eV and 1.84 eV, respectively. The ferroelectric polarization values calculated by the Berry phase method are around 12.75 mu C/cm(2) and 9.69 mu C/cm(2), respectively. The contribution of each atomic layer to the ferroelectric polarization is investigated when the Born effective charge method is used. The results show that the polarization of Sr3B2Se7 (B = Zr, Hf) mainly comes from the Sr-Se atomic layers. To sum up, Sr3B2Se7 (B = Zr, Hf) show strong ferroelectric polarization and good visible light absorption characteristics and they are expected to be candidates of a new generation of ferroelectric photovoltaic materials.
关键词 ：
ferroelectric photovoltaic ferroelectric photovoltaic first-principle first-principle hybrid improper ferroelectricity hybrid improper ferroelectricity Ruddlesden-Popper Ruddlesden-Popper
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| GB/T 7714 | Wang Chao , Zhang Ming , Zhang Chi et al. First-principle investigation of hybrid improper ferroelectricity of n=2 Ruddlesden-Popper Sr3B2Se7 (B = Zr, Hf) [J]. | ACTA PHYSICA SINICA , 2021 , 70 (11) . |
| MLA | Wang Chao et al. "First-principle investigation of hybrid improper ferroelectricity of n=2 Ruddlesden-Popper Sr3B2Se7 (B = Zr, Hf)" . | ACTA PHYSICA SINICA 70 . 11 (2021) . |
| APA | Wang Chao , Zhang Ming , Zhang Chi , Wang Ru-Zhi , Yan Hui . First-principle investigation of hybrid improper ferroelectricity of n=2 Ruddlesden-Popper Sr3B2Se7 (B = Zr, Hf) . | ACTA PHYSICA SINICA , 2021 , 70 (11) . |
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摘要 ：
Microchannel heat sinks have important applications in integrated circuits, but the current traditional long straight microchannel heat dissipation process causes uneven temperature and low heat dissipation efficiency. In this paper, a periodic split-flow microstructure is designed and integrated with traditional microchannels to form a periodic split-flow microchannel heat sink. Numerical simulation is used to study the influence of the number, the arrangement and structural parameters of microstructures in a single microchannel on its thermal performance. The simulation results show that the split-flow microstructure can increase the heat exchange area, break the original laminar boundary layer, promote the mixing of cold/hot coolant, and significantly improve the heat dissipation performance of the microchannel. Through comparative experiments, 9 groups are finally determined as the optimal number of microstructures in a single microchannel. At a heat flux of 100 W/cm(2), when the coolant flow rate at the inlet is 1.18 m/s, after 9 groups of microstructures are added into a single microchannel, the maximum temperature drops by about 24 K and the thermal resistance decreases by about 44%. The Nusselt number is increased by about 124%, and the performance evaluation criterion (PEC) reaches 1.465. On this basis, the microstructure adopts a staggered gradual periodic arrangement to avoid the long-distance non-microstructure section between the two groups of microstructures. The turbulence element that gradually widens along the flow direction makes the coolant fully utilized. This results in a reduction in the high/low temperature zone and alleviates the temperature gradient that exists along the flow direction of the heat dissipation surface, and the pressure drop loss is also reduced to a certain extent compared with the pressure drop in the uniform arrangement, and the comprehensive thermal performance is further improved. It shows broad application prospects in the field of high-power integrated circuits and electronic cooling.
关键词 ：
heat dissipation structure heat dissipation structure microchannel microchannel periodic split-flow periodic split-flow
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| GB/T 7714 | Wang Han , Yuan Li , Wang Chao et al. Structure and thermal properties of periodic split-flow microchannels [J]. | ACTA PHYSICA SINICA , 2021 , 70 (10) . |
| MLA | Wang Han et al. "Structure and thermal properties of periodic split-flow microchannels" . | ACTA PHYSICA SINICA 70 . 10 (2021) . |
| APA | Wang Han , Yuan Li , Wang Chao , Wang Ru-Zhi . Structure and thermal properties of periodic split-flow microchannels . | ACTA PHYSICA SINICA , 2021 , 70 (10) . |
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