8 research outputs found

    朗伯模型参数优化的可见光室内定位技术

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    白光发光二极管(LED)的发光模型是室内可见光定位系统设计的重要基础,发光模型参数不准确会严重影响可见光定位的精度。针对这一问题,文章提出了一种朗伯模型参数优化方法,该方法利用基于接收信号强度的可见光室内技术中朗伯模型参数对定位误差的影响,通过调整朗伯指数寻找最小测距误差,当测距误差最小时,所对应的朗伯指数与LED的真实朗伯指数最为接近。仿真了室内5m×5m×3m的场景,结果表明,朗伯模型参数优化方法能显著提高可见光室内定位精度,也验证了朗伯模型参数优化方法的可行性及有效性

    新疆典型绿洲经济发展与生态环境建设

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    科技进步奖三等奖.该成果是中科院“八五”重点科研项目和国家自然科学基金资助项目。分上下篇和专题篇,全文40万字。对绿洲的形成、演变规律、系统特性、生态经济、生态环境建设、协调发展,作了系统而精辟地论述;对吐鲁番绿洲的资源开发、经济发展、环境建设和优化模式作了深刻提示和分析;对一些专门问题作了剖析研究,周密阐述。是一项重要的绿洲基础理论研究和绿洲开发研究,将使中国的绿洲研究提高到一个新的水平。该成果对绿洲系、绿洲生态经济和环境建设提出了较深刻的新论点,首次提出研究绿洲的方法论。对吐鲁番绿洲研究提出水资源转换规律、经济发展战略和结构转换,有独到见解。绿洲研究涉及面广,时间跨度长。绿洲是一个综合性强的地理区域、生态学、经济学、人口学、历史学、农学和水利学有密切关系。时间上从古代、近代到现代作了动态研究,尤其是近50年作了细致分析。研究工作量大、难度大。该成果在绿洲的基本理论研究填补了中国绿洲研究方面的空白,对绿洲建设和新疆经济发展有重要理论意义和实践意义,对发展“绿洲学”有重要学术价值,成果达到国内领先水平

    基于微通道板的多击响应位置灵敏探测器

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    与传统的四角延迟线阳极相比,三层延迟线阳极,即六角延迟线阳极具有很好的多击信号读出本领。它与微通道板结合,能够探测很短时间间隔内到达的多个粒子的时间和位置信息。文章介绍了基于微通道板的六角阳极探测器的结构及多击响应原理,报道了利用Puα源对该探测器及中心带孔的六角阳极探测器的测试结果,探测器位置分辨好于0.2毫米

    低能He~(2+)入射He原子转移电离实验中出射电子成像研究;Momentum image of emission electrons in transfer ionization process of slow He~(2+) colliding on He

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    利用反应显微谱仪对70keV He2+-He转移电离过程中的出射电子进行了成像,研究了出射电子的空间速度分布特征.结果表明:电子主要集中在散射平面内;在散射平面内,电子速度分布介于零与入射离子速度Vp之间(即前向出射)且在散射离子和靶核核间轴处有一极小值,呈现出典型的双峰结构.出射电子的上述分布特征可由出射电子波函数σ振幅和π振幅的干涉进行定性解释,σ振幅和π振幅对出射电子波函数的贡献与碰撞参数相关.在小碰撞参数下,π振幅的贡献更加明显;而在大碰撞参数下,σ振幅的贡献更加显著

    JUNO Sensitivity on Proton Decay pνˉK+p\to \bar\nu K^+ Searches

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    The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in pνˉK+p\to \bar\nu K^+ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via pνˉK+p\to \bar\nu K^+ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is 9.6×10339.6 \times 10^{33} years, competitive with the current best limits on the proton lifetime in this channel

    JUNO sensitivity on proton decay pνK+p → νK^{+} searches

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    JUNO sensitivity on proton decay p → ν K + searches*

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    The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the pνˉK+ p\to \bar{\nu} K^+ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via pνˉK+ p\to \bar{\nu} K^+ is 36.9% ± 4.9% with a background level of 0.2±0.05(syst)±0.2\pm 0.05({\rm syst})\pm 0.2(stat) 0.2({\rm stat}) events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is 9.6×1033 9.6 \times 10^{33} years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies
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