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Design,test,and verification of in-situ condition preserved coring and analysis system in lunar-based simulation environment
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作者 Haichun Hao Mingzhong gao +10 位作者 Yan Wu zheng gao Yongcheng Li Xuemin Zhou Peng Chu Xuan Wang Jiahua Li Lang Zhou Jie Song Tianxiang Ao Yikun Yang 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2024年第9期1259-1272,共14页
The lunar surface and its deep layers contain abundant resources and valuable information resources,the exploration and exploitation of which are important for the sustainable development of the human economy and soci... The lunar surface and its deep layers contain abundant resources and valuable information resources,the exploration and exploitation of which are important for the sustainable development of the human economy and society.Technological exploration and research in the field of deep space science,especially lunar-based exploration,is a scientific strategy that has been pursued in China and worldwide.Drilling and sampling are key to accurate exploration of the desirable characteristics of deep lunar resources.In this study,an in-situ condition preserved coring(ICP-Coring)and analysis system,which can be used to test drilling tools and develop effective sampling strategies,was designed.The key features of the system include:(1)capability to replicate the extreme temperature fluctuations of the lunar environment(-185 to 200℃)with intelligent temperature control;(2)ability to maintain a vacuum environment at a scale of 10^(-3) Pa,both under unloaded conditions within Ф580 mm×1000 mm test chamber,and under loaded conditions using Ф400 mm×800 mm lunar rock simulant;(3)application of axial pressures up to 4 MPa and confining pressures up to 3.5 MPa;(4)sample rotation at any angle with a maximum sampling length of 800 mm;and(5)multiple modes of rotary-percussive drilling,controlled by penetration speed and weight on bit(WOB).Experimental studies on the drilling characteristics in the lunar rock simulant-loaded state under different drill bit-percussive-vacuum environment configurations were conducted.The results show that the outgassing rate of the lunar soil simulant is greater than that of the lunar rock simulant and that a low-temperature environment contributes to a reduced vacuum of the lunar-based simulated environment.The rotary-percussive drilling method effectively shortens the sampling time.With increasing sampling depth,the temperature rise of the drilling tools tends to rapidly increase,followed by slow growth or steady fluctuations.The temperature rise energy accumulation of the drill bits under vacuum is more significant than that under atmospheric pressure,approximately 1.47 times higher.The real-time monitored drilling pressure,penetration speed and rotary torque during drilling serve as parameters for discriminating the drilling status.The results of this research can provide a scientific basis for returning samples from lunar rock in extreme lunar-based environments. 展开更多
关键词 Lunar-based Large temperature difference Vacuum Drilling and coring System design
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核电厂反应堆保护系统可靠性分配研究
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作者 刘宏春 王琳 +4 位作者 徐霖野 陈鹏 郑杲 孙诗炎 吴志强 《仪器仪表用户》 2023年第8期66-69,61,共5页
为实现对可靠性指标的合理分配,以典型反应堆保护系统结构为研究对象,并基于通用共因失效数据和类似设备经验数据,提出了一种可操作性强的反应堆保护系统可靠性分配方法。详细介绍了可靠性分配流程,并进行实例推导。该研究成果可为后续... 为实现对可靠性指标的合理分配,以典型反应堆保护系统结构为研究对象,并基于通用共因失效数据和类似设备经验数据,提出了一种可操作性强的反应堆保护系统可靠性分配方法。详细介绍了可靠性分配流程,并进行实例推导。该研究成果可为后续核电厂的反应堆保护系统设计或优化提供借鉴。 展开更多
关键词 反应堆保护系统 共因故障 可靠性
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核电仪控系统平台器件级兼容性设计研究
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作者 陈美远 刘艳阳 +6 位作者 朱宏亮 何正熙 何亮 郑杲 王春蕾 刘依依 王昭苏 《自动化仪表》 CAS 2023年第S01期246-250,共5页
针对国际电子元器件市场形势复杂多变的现状,结合核电行业面临的挑战与机遇,提出了核电仪控系统平台器件级兼容性设计研究。通过分析核电仪控系统平台兼容性设计需求及国产器件行业的总体情况,梳理出了中央控制器、通用微控制器、可编... 针对国际电子元器件市场形势复杂多变的现状,结合核电行业面临的挑战与机遇,提出了核电仪控系统平台器件级兼容性设计研究。通过分析核电仪控系统平台兼容性设计需求及国产器件行业的总体情况,梳理出了中央控制器、通用微控制器、可编程逻辑器件三类主要器件,并对三类器件的国产供应商和系列产品情况进行了介绍。明确了现有国产器件的系列产品和性能可有力支撑核电仪控系统平台器件级兼容性设计研究。提出了依托行业联盟牵头建立核电仪控行业通用的国产器件验证评价体系和优选目录,并详细阐述了验证评价体系和优选目录建立的主要环节、要素和方法。该研究的成果可推动核电仪控系统平台器件级兼容性设计进程,促进我国核电仪控全行业的高质量快速发展。 展开更多
关键词 核电仪控系统平台 器件级兼容性设计 行业联盟 验证评价体系 优选目录
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燃油污染对多孔介质水文地质参数的影响研究
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作者 杨鹏飞 陈余道 +5 位作者 蒋亚萍 闫嘉宁 郑杲 邹志坤 刘权 覃佳肖 《高校地质学报》 CAS CSCD 北大核心 2023年第4期608-616,共9页
燃油污染对地下水环境造成的影响不容忽视,调查污染场地的水文地质参数,有助于更好地认识污染前后水文地质参数的变化,以及污染物在地下水中迁移行为的变化。文章通过3个阶段的定量示踪实验,对实验室砂槽开展了污染前和污染后水文地质... 燃油污染对地下水环境造成的影响不容忽视,调查污染场地的水文地质参数,有助于更好地认识污染前后水文地质参数的变化,以及污染物在地下水中迁移行为的变化。文章通过3个阶段的定量示踪实验,对实验室砂槽开展了污染前和污染后水文地质参数估测,对比了汽油污染前后参数的差异,评价汽油污染对水文地质参数的影响。结果表明:(1)汽油污染的积累会导致生物堵塞发生,生物堵塞程度随着渗流距离的增加有减缓趋势;多孔介质中不同区域溶质弥散作用存在差异,中央线上优势流的溶质通量增加,质量回收率提高;溶质穿透曲线峰型呈现瘦高型,并出现明显的拖尾。(2)通过监测长达6年的汽油污染实验,传统汽油砂槽(TG-tank)和乙醇汽油砂槽(EG-tank)的渗透系数分别为25.4、20.5 m/d,降低为砂槽被污染前初始渗透系数K_Ⅱ的61%、49%;TG-tank和EG-tank的有效孔隙度由初始值0.30分别减小为0.28、0.26;与未污染时比,污染后水动力弥散系数也会减小。乙醇汽油污染对多孔介质渗透性的削弱更显著,有机污染的积累会改变污染场地的水文地质参数,加强污染后水文地质参数的估测,能够为评价污染风险提供合理依据。 展开更多
关键词 水文地质参数 生物堵塞 地下水污染 LNAPL 时间矩 示踪实验
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Selection and thermal physical characteristics analysis of in-situ condition preserved coring lunar rock simulant in extreme environment 被引量:2
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作者 Haichun Hao Mingzhong gao +5 位作者 Cunbao Li Xuan Wang Yan Wu zheng gao Wen Yu Xuemin Zhou 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2023年第11期1411-1424,共14页
With the increasing scarcity of Earth’s resources and the development of space science and technology,the exploration, development, and utilization of deep space-specific material resources(minerals, water ice, volat... With the increasing scarcity of Earth’s resources and the development of space science and technology,the exploration, development, and utilization of deep space-specific material resources(minerals, water ice, volatile compounds, etc.) are not only important to supplement the resources and reserves on Earth but also provide a material foundation for establishing extraterrestrial research bases. To achieve large depth in-situ condition-preserved coring(ICP-Coring) in the extreme lunar environment, first, lunar rock simulant was selected(SZU-1), which has a material composition, element distribution, and physical and mechanical properties that are approximately equivalent to those of lunar mare basalt. Second, the influence of the lunar-based in-situ environment on the phase, microstructure, and thermal physical properties(specific heat capacity, thermal conductivity, thermal diffusivity, and thermal expansion coefficient)of SZU-1 was explored and compared with the measured lunar rock data. It was found that in an air atmosphere, low temperature has a more pronounced effect on the relative content of olivine than other temperatures, while in a vacuum atmosphere, the relative contents of olivine and anorthite are significantly affected only at temperatures of approximately-20 and 200 ℃. When the vacuum level is less than100 Pa, the contribution of air conduction can be almost neglected, whereas it becomes dominant above this threshold. Additionally, as the testing temperature increases, the surface of SZU-1 exhibits increased microcracking, fracture opening, and unevenness, while the specific heat capacity, thermal conductivity,and thermal expansion coefficient show nonlinear increases. Conversely, the thermal diffusivity exhibits a nonlinear decreasing trend. The relationship between thermal conductivity, thermal diffusivity, and temperature can be effectively described by an exponential function(R^(2)>0.98). The research results are consistent with previous studies on real lunar rocks. These research findings are expected to be applied in the development of the test and analysis systems of ICP-Coring in a lunar environment and the exploration of the mechanism of machine-rock interaction in the in-situ drilling and coring process. 展开更多
关键词 Lunar-based Lunar rock simulant Extreme environment Thermal physical properties
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拉伸法制备聚四氟乙烯平板膜的研究进展 被引量:1
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作者 唐志鹏 沈育才 +1 位作者 高政 费传军 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2023年第1期175-182,共8页
聚四氟乙烯(PTFE)因其自身的优异性能,吸引了国内外众多专家学者的注意力。PTFE拉伸平板膜具有独特的“原纤-节点”结构,在航天、汽车、化工、医疗等领域有着广阔的应用前景。文中主要综述了在采用机械拉伸法制备PTFE平板膜过程中,通过... 聚四氟乙烯(PTFE)因其自身的优异性能,吸引了国内外众多专家学者的注意力。PTFE拉伸平板膜具有独特的“原纤-节点”结构,在航天、汽车、化工、医疗等领域有着广阔的应用前景。文中主要综述了在采用机械拉伸法制备PTFE平板膜过程中,通过控制原料种类与组成、设备、工艺参数等方式来调控糊料挤出物和薄膜的结构性能。最后,对PTFE独特的成纤和拉伸成孔机理与工艺参数之间的研究进行了展望,指明了PTFE平板膜应用领域的研究方向。 展开更多
关键词 聚四氟乙烯 拉伸法 平板膜 微观结构
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“华龙一号”棒控棒位系统质量提升关键技术研究
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作者 唐诗涵 郑杲 +5 位作者 李梦书 彭子恒 李国勇 许明周 王春蕾 陈帅君 《中国核电》 2023年第3期380-386,共7页
“华龙一号”作为当今世界核电市场接受度最高的三大堆型之一,对反应堆的设计制造提出了更高的质量要求。现有的二代核电棒控棒位系统在动态控制性能、测量精度、设备功耗、系统可操作性、设备可用性等系统技术和产品质量方面还需一步提... “华龙一号”作为当今世界核电市场接受度最高的三大堆型之一,对反应堆的设计制造提出了更高的质量要求。现有的二代核电棒控棒位系统在动态控制性能、测量精度、设备功耗、系统可操作性、设备可用性等系统技术和产品质量方面还需一步提升,从而满足三代核电厂长期安全、经济、稳定运行。基于“华龙一号”棒控棒位系统质量提升需求,综合利用了TRIZ理论中的“矛盾矩阵”和“物质-场”分析法来定位每个质量创新技术发明点的创新原理,从而找出技术创新的突破口。通过理论与实践的有机结合,完成了棒控棒位系统中多模式自适应控制、数字化测量信号动态补偿、低功耗高稳定驱动、智能化系统参数调节等多项技术创新,全面提升了棒控棒位系统的安全性、可靠性、经济性和自主性等质量性能。 展开更多
关键词 棒控棒位 TRIZ理论 矛盾矩阵 物质-场分析法
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Measurement of the cavity-loaded quality factor in superconducting radio-frequency systems with mismatched source impedance
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作者 Jin-Ying Ma Cheng-Ye Xu +12 位作者 An-Dong Wu Guo-Dong Jiang Yue Tao Zong-Heng Xue Long-Bo Shi Tian-Cai Jiang zheng-Long Zhu Zi-Qin Yang zheng gao Lie-Peng Sun Gui-Rong Huang Feng Qiu Yuan He 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2023年第8期12-23,共12页
The accurate measurement of parameters such as the cavity-loaded quality factor(Q_(L))and half bandwidth(f_(0.5))is essential for monitoring the performance of superconducting radio-frequency cavities.However,the conv... The accurate measurement of parameters such as the cavity-loaded quality factor(Q_(L))and half bandwidth(f_(0.5))is essential for monitoring the performance of superconducting radio-frequency cavities.However,the conventional"field decay method"employed to calibrate these values requires the cavity to satisfy a"zero-input"condition.This can be challenging when the source impedance is mismatched and produce nonzero forward signals(V_(f))that significantly affect the measurement accuracy.To address this limitation,we developed a modified version of the"field decay method"based on the cavity differential equation.The proposed approach enables the precise calibration of f_(0.5) even under mismatch conditions.We tested the proposed approach on the SRF cavities of the Chinese Accelerator-Driven System Front-End Demo Superconducting Linac and compared the results with those obtained from a network analyzer.The two sets of results were consistent,indicating the usefulness of the proposed approach. 展开更多
关键词 Loaded quality factor Field decay method Superconducting cavity MISMATCH Calibration Cavity differential equation Measurement Accelerator-driven system
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数字化棒控电源柜可靠性设计与分析 被引量:5
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作者 何佳佶 郑杲 +6 位作者 何正熙 黄可东 李国勇 许明周 李梦书 刘依依 张芸 《自动化仪表》 CAS 2019年第6期80-83,共4页
随着数字化技术在核电领域的普及,针对棒控电源柜的功能和结构特点,提出了数字化棒控电源柜的可靠性设计与分析方法。结合可靠性设计理念,提出了数字化电源柜的可靠性设计原则。根据棒控棒位系统对电源柜的功能需求,首次提出将电源柜可... 随着数字化技术在核电领域的普及,针对棒控电源柜的功能和结构特点,提出了数字化棒控电源柜的可靠性设计与分析方法。结合可靠性设计理念,提出了数字化电源柜的可靠性设计原则。根据棒控棒位系统对电源柜的功能需求,首次提出将电源柜可靠性划分为完全功能可靠性和后备功能可靠性两类,并分别建立可靠性模型。分析核电厂实际运行情况与元器件老化机理,加入利用率系数,对电源柜可靠性模型进行了修正。通过计算对比,证明了修正后的可靠性模型更符合实际运行规律,验证了电源柜可靠性分类的有效性。该研究为棒控电源柜的研发设计以及现场运行维护提供了理论基础,也为数字化仪控设备(特别是核电厂专用仪控设备)的可靠性分析提供了新思路。 展开更多
关键词 核电厂 数字化 棒控电源柜 可靠性 老化机理 利用率系数 仪控设备 失效率
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广西盘龙铅锌矿区F_(2)断层透水性及控水作用分析 被引量:3
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作者 覃佳肖 黄泽霖 +4 位作者 蒋亚萍 陈余道 夏源 郑杲 闫嘉宁 《安全与环境工程》 CAS CSCD 北大核心 2022年第6期54-61,共8页
岩溶金属矿区断层的透水性是制约水害防控工作的关键因素。以广西盘龙铅锌矿区F_(2)断层为研究对象,通过整理该矿区地下水水位监测数据、抽水试验、声纳渗流测井试验以及可控源音频大地电磁(CSAMT)法等勘查成果,分析了广西盘龙铅锌矿区F... 岩溶金属矿区断层的透水性是制约水害防控工作的关键因素。以广西盘龙铅锌矿区F_(2)断层为研究对象,通过整理该矿区地下水水位监测数据、抽水试验、声纳渗流测井试验以及可控源音频大地电磁(CSAMT)法等勘查成果,分析了广西盘龙铅锌矿区F_(2)断层的透水性规律及其对矿区的控水作用。结果表明:在盘龙铅锌矿区大岭矿段疏干开采情形下,F_(2)断层的透水性呈现南北差异,但总体上显示弱透水;F_(2)断层的控水作用表现为矿区南段相对隔水导致盘古村一带的地下水向北东径流至WT9测线附近再转向南东穿越F_(2)断层,成为矿区大岭矿段疏干区的涌水水源;在F_(2)断层弱透水作用下,矿区西部崩山矿段地下水子系统向大岭矿段的充水量约为矿坑排水量的22.5%。将水文地质和物探方法联合运用于矿区断层透水性调查,将有助于复杂岩溶矿山水害的防控,研究结果可为岩溶金属矿区安全治水提供科学依据。 展开更多
关键词 断层 透水性 控水作用 广西盘龙铅锌矿区
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核电站数字化棒位测量通道的研究与设计
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作者 李梦书 李国勇 +5 位作者 何正熙 黄可东 郑杲 许明周 何佳佶 彭子恒 《自动化仪表》 CAS 2021年第S01期83-87,共5页
控制棒实测棒位信息是核电站运行过程中的一项重要参数。利用棒位测量通道,能够有效获得准确的棒位信息。目前运行的核电站中被广泛使用的棒位测量通道,往往采用以数控调节器为核心的模拟电路设计。该设计在实际运行中控制精度较低、信... 控制棒实测棒位信息是核电站运行过程中的一项重要参数。利用棒位测量通道,能够有效获得准确的棒位信息。目前运行的核电站中被广泛使用的棒位测量通道,往往采用以数控调节器为核心的模拟电路设计。该设计在实际运行中控制精度较低、信号处理误差较大,测量棒位易出现跳变。为解决这些问题,以数字处理芯片为核心,研究并设计了数字化棒位测量通道。通过理论分析与试验的方式,验证了该设计的可行性。该设计能够有效地提高控制和测量精度,具有实际的应用价值。 展开更多
关键词 核电站 控制棒 实测棒位 棒位测量通道 数字化 测量精度
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Control of Southern Root-knot Nematodes on Tomato and Regulation of Soil Bacterial Community by Biofumigation with Zanthoxylum bungeanum Seed 被引量:3
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作者 Xiaoyun Wang Wencong Shi +4 位作者 Jilei Wang zheng gao Shuang Li Ningxin Wang Qinghua Shi 《Horticultural Plant Journal》 SCIE CSCD 2021年第1期49-58,共10页
Biofumigation is an environmentally friendly strategy used to control nematodes and plant diseases.The volatile oil of Zanthoxylum bungeanum has high insecticidal and antibacterial activity.However,it is not known if ... Biofumigation is an environmentally friendly strategy used to control nematodes and plant diseases.The volatile oil of Zanthoxylum bungeanum has high insecticidal and antibacterial activity.However,it is not known if the seed of Z.bungeanum is a suitable material for biofumigation to control southern root-knot nematodes(SRKN)on tomato,and how it may regulate the soil bacterial community structure.We used pot experiments in the greenhouse to determine the effects of Z.bungeanum seeds on SRKN,plant growth parameters,soil physicochemical and microbial characteristics.A total of 26 volatile components,including nematicidally active substances,were identified from Z.bungeanum seeds.Z.bungeanum seed biofumigation significantly reduced the SRKN population by 88.89%and 81.55%on the 50th and 100th day after transplanting,respectively.Compared to the control,the total soluble sugar,soluble solids,soluble protein,titratable acid,root activity and the fruit yield per tomato plant increased significantly.The content of soil alkali-hydrolyzed nitrogen,available potassium and the soil enzyme activities were also significantly increased.The soil bacterial diversity and the co-occurrence network complexity were increased by Z.bungeanum seed biofumigation.Relativelymore keystone OTUs in biofumigation soil had potential plant growth-promoting capabilities.The function of Z.bungeanum seed increasing tomato production in SRKN-infected soil depends on directly killing SRKN and improving soil properties.These results indicate that Z.bungeanum seed can be used as both a nematicide and a high quality organic fertilizer in tomato production. 展开更多
关键词 biofumigant Zanthoxylum bungeanum seed root-knot nematode TOMATO soil bacterial community
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Multi-frequency point supported LLRF front-end for CiADS wide-bandwidth application 被引量:3
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作者 Qi Chen zheng gao +3 位作者 zheng-Long Zhu Zong-Heng Xue Yuan He Xian-Wu Wang 《Nuclear Science and Techniques》 SCIE CAS CSCD 2020年第3期66-73,共8页
The China initiative Accelerator Driven System,CiADS,physics design adopts 162.5 MHz,325 MHz,and 650 MHz cavities,which are driven by the corresponding radio frequency(RF)power system,requiring frequency translation f... The China initiative Accelerator Driven System,CiADS,physics design adopts 162.5 MHz,325 MHz,and 650 MHz cavities,which are driven by the corresponding radio frequency(RF)power system,requiring frequency translation front-end for the RF station.For that application,a general-purpose design front-end prototype has been developed to evaluate the multi-frequency point supported design feasibility.The difficult parts to achieve the requirements of the general-purpose design are reasonable device selection and balanced design.With a carefully selected low-noise wide-band RF mixer and amplifier to balance the performance of multi-frequency supported down-conversion,specially designed LO distribution net to increase isolation between adjacent channels,and external band-pass filter to realize expected up-conversion frequencies,high maintenance and modular front-end generalpurpose design has been implemented.Results of standard parameters show an R2 value of at least 99.991%in the range of-60-10 dBm for linearity,up to 18 dBm for P1dB,and up to 89 dBc for cross talk between adjacent channels.The phase noise spectrum is lower than 80 dBc in the range of 0-1 MHz;cumulative phase noise is 0.006°;and amplitude and phase stability are 0.022%and 0.034°,respectively. 展开更多
关键词 Frequency jump RF Front-end LLRF CiADS
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Characterization of the fracture compressibility and its permeability for shale under the effects of proppant embedment and compaction:A preliminary study 被引量:2
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作者 Jian-Hua Li Bo-Bo Li +1 位作者 Qiao-Yun Cheng zheng gao 《Petroleum Science》 SCIE CAS CSCD 2022年第3期1125-1138,共14页
Hydraulic fracturing technology plays a key role in improving the recovery rate of shale gas.The improvement of permeability in relation to hydraulic fracturing depends on changes brought about by the proppant on the ... Hydraulic fracturing technology plays a key role in improving the recovery rate of shale gas.The improvement of permeability in relation to hydraulic fracturing depends on changes brought about by the proppant on the fracture structure in reservoirs.Then it is of great significance to describe the microscopic changes during this process by means of an accurate theoretical model.In this study,based on the heterogeneity of shale fracture and the compaction and embedment of a proppant,we proposed a permeability model to examine the combined effects of a proppant and stress to describe the change mechanism in permeability.Further,changes in fracture width and porosity were considered,and a calculation model of fracture compressibility under proppant compaction and embedment was proposed.The difference from previous studies is that the compressibility and permeability of supported fractures can be further quantified and analyzed by this model.Moreover,its rationality was verified by publicly released test data.The results show that,the compressive effect of stress and the embedding of proppant both have a negative impact on shale permeability. 展开更多
关键词 SHALE Fracture compressibility PERMEABILITY Hydraulic fracturing Proppant embedment
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Defect Passivation on Lead-Free CsSnI_(3) Perovskite Nanowires Enables High-Performance Photodetectors with Ultra-High Stability 被引量:2
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作者 zheng gao Hai Zhou +7 位作者 Kailian Dong Chen Wang Jiayun Wei Zhe Li Jiashuai Li Yongjie Liu Jiang Zhao Guojia Fang 《Nano-Micro Letters》 SCIE EI CAS CSCD 2022年第12期481-490,共10页
In recent years,Pb-free CsSnI_(3) perovskite materials with excellent photoelectric properties as well as low toxicity are attracting much atten-tion in photoelectric devices.However,deep level defects in CsSnI_(3),su... In recent years,Pb-free CsSnI_(3) perovskite materials with excellent photoelectric properties as well as low toxicity are attracting much atten-tion in photoelectric devices.However,deep level defects in CsSnI_(3),such as high density of tin vacancies,structural deformation of SnI_(6)−octahedra and oxidation of Sn^(2+)states,are the major challenge to achieve high-performance CsSnI_(3)-based photoelectric devices with good stability.In this work,defect passivation method is adopted to solve the above issues,and the ultra-stable and high-performance CsSnI_(3) nanowires(NWs)photodetectors(PDs)are fabricated via incorporating 1-butyl-2,3-dimethylimidazolium chloride salt(BMIMCl)into perovskites.Through materials analysis and theoretical calculations,BMIM+ions can effectively passivate the Sn-related defects and reduce the dark current of CsSnI_(3) NW PDs.To further reduce the dark current of the devices,the polymethyl methacrylate is introduced,and finally,the dual passivated CsSnI_(3) NWPDs show ultra-high performance with an ultra-low dark current of 2×10^(-11) A,a responsivity of up to 0.237 A W^(−1),a high detectivity of 1.18×10^(12) Jones and a linear dynamic range of 180 dB.Furthermore,the unpackaged devices exhibit ultra-high stability in device performance after 60 days of storage in air(25℃,50% humidity),with the device performance remaining above 90%. 展开更多
关键词 Pb-free PEROVSKITE CsSnI_(3) PHOTODETECTOR NANOWIRE
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基于结构方程模型的卫星应用体系评估研究 被引量:3
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作者 孙盛智 郑高 孟春宁 《兵器装备工程学报》 CAS 北大核心 2019年第1期19-23,43,共6页
提出结构方程模型的评估方法;可以同时处理卫星应用能力体系、装备体系和技术体系的多个因变量,从而实现能力体系、装备体系和技术体系的联动评估,最后以远程精确打击作战为例,通过结构方程模型的测量方程,分别推导构建显变量与潜变量... 提出结构方程模型的评估方法;可以同时处理卫星应用能力体系、装备体系和技术体系的多个因变量,从而实现能力体系、装备体系和技术体系的联动评估,最后以远程精确打击作战为例,通过结构方程模型的测量方程,分别推导构建显变量与潜变量之间以及潜变量之间的线性关系,分析对能力、装备和技术的关键影响因素;研究结构方程模型在卫星应用体系领域的应用,对评估太空信息支援军事行动具有重要意义。 展开更多
关键词 卫星应用体系 结构方程模型 远程精确打击
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Precise calibration of cavity forward and reflected signals using low-level radio-frequency system 被引量:1
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作者 Jin-Ying Ma Feng Qiu +11 位作者 Long-Bo Shi zheng-Long Zhu Tian-Cai Jiang Zong-Heng Xue Ke-An Jin Qi Chen Cheng-Ye Xu Xing-Hao Ding zheng gao Lie-Peng Sun Gui-Rong Huang Yuan He 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2022年第1期35-43,共9页
Precise measurements of the cavity forward(Vf)and reflected signals(Vr)are essential for characterizing other key parameters such as the cavity detuning and forward power.In practice,it is challenging to measure V_(f)... Precise measurements of the cavity forward(Vf)and reflected signals(Vr)are essential for characterizing other key parameters such as the cavity detuning and forward power.In practice,it is challenging to measure V_(f) and V_(r) precisely because of cross talk between the forward and reflected channels(e.g.,coupling between the cavity reflected and forward signals in a directional coupler with limited directivity).For DESY,a method based on the cavity differential equation was proposed to precisely calibrate the actual V_(f) and V_(r).In this study,we verified the validity and practicability of this approach for the Chinese ADS front-end demo superconducting linac(CAFe)facility at the Institute of Modern Physics and a compact energy recovery linac(cERL)test machine at KEK.At the CAFe facility,we successfully calibrated the actual V_(f) signal using this method.The result demonstrated that the directivity of directional couplers might seriously affect the accuracy of V_(f) measurement.At the cERL facility,we calibrated the Lorentz force detuning(LFD)using the actual Vf.Our study confirmed that the precise calibration of V_(f) significantly improves the accuracy of the cavity LFD measurement. 展开更多
关键词 Forward and reflected signals MEASUREMENT CALIBRATION
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机载LIDAR数据中架空输电线路的提取 被引量:2
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作者 郑高 张伟豪 +2 位作者 韩腾飞 陈梅僖 曾旭 《电子测试》 2022年第7期39-42,共4页
通过无人机搭载激光雷达(LIDAR)对架空输电线路及杆塔进行通道扫描,可以快速获取杆塔三维点云模型,对输电线路弧垂测量、树障分析具有重要作用。架空输电线路户外环境复杂,在高密复杂点云中提取有效杆塔及线路信息,具有重要研究意义。... 通过无人机搭载激光雷达(LIDAR)对架空输电线路及杆塔进行通道扫描,可以快速获取杆塔三维点云模型,对输电线路弧垂测量、树障分析具有重要作用。架空输电线路户外环境复杂,在高密复杂点云中提取有效杆塔及线路信息,具有重要研究意义。针对上述需求,本文提出一种高效的架空输电线路提取方法。该方法首先采用布料模拟的点云滤波算法(CSF)剔除地面点,然后在非地面点构建KD树结构,以非地面点中的杆塔最高点作为搜索点进行连通域分析,从而将残余植被分离,提取架空输电线路的信息。实验结果表明该方法能正确高效的提取出电力线杆塔,提取正确率达到了99%以上,具有良好的应用价值。 展开更多
关键词 LIDAR 布料模拟滤波 连通域分析 架空输电线路提取
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基于STAR-CCM+的导管螺旋桨黏性流场计算方法研究 被引量:6
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作者 邱鹏 郑高 李国诚 《船舶标准化工程师》 2019年第3期54-58,64,共6页
以19A导管配ka4-70、螺距比为1.0的螺旋桨为研究对象,通过求解RANS方程,采用CFD方法并借助STAR-CCM+流体软件,对其敞水性能进行了数值研究,与现有试验值进行了比较,从而探讨了不同网格类型和不同湍流模型对其敞水性能计算精度的影响。... 以19A导管配ka4-70、螺距比为1.0的螺旋桨为研究对象,通过求解RANS方程,采用CFD方法并借助STAR-CCM+流体软件,对其敞水性能进行了数值研究,与现有试验值进行了比较,从而探讨了不同网格类型和不同湍流模型对其敞水性能计算精度的影响。分析了特种推进器在进速系数为0.3时的黏性流场特性,验证了采用STAR-CCM+进行导管桨性能数值模拟方法的可靠性,为之后的导管桨黏性流场数值研究提供了参考意见。 展开更多
关键词 STARCCM+ 导管桨 敞水性能 黏性流场 数值计算
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船用海水淡化技术发展现状和趋势 被引量:1
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作者 郑高 吴旭 《机电工程技术》 2022年第9期43-47,共5页
作为供应淡水的主要设备,海水淡化装置已成为现代船舶的必要组成部分。综述了船用海水淡化技术的发展现状和趋势,以期为以后的理论研究与实际应用提供参考与依据。简述传统海水淡化技术的基本原理,包括从海水中取出淡水的技术、从海水... 作为供应淡水的主要设备,海水淡化装置已成为现代船舶的必要组成部分。综述了船用海水淡化技术的发展现状和趋势,以期为以后的理论研究与实际应用提供参考与依据。简述传统海水淡化技术的基本原理,包括从海水中取出淡水的技术、从海水中去掉盐的技术2个方面,重点为蒸馏法、反渗透法、冰冻法、水合物法、电渗析法、离子交换法及电容吸附法的基本原理。列举近年来与船用海水淡化技术相关的研究成果与成功应用案例,并从耦合技术的应用、新材料的发明、新技术的推广、新能源的开发4个方面分析船用海水淡化技术的当前发展现状。最后,指出高水质、高产水率、低能耗、低污染、低成本、小型化、智能化、高可靠性等是未来的必然发展趋势。 展开更多
关键词 船用海水淡化技术 蒸馏法 反渗透法 电渗析法 耦合技术
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