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The photometric system of the One-meter Telescope at Weihai Observatory of Shandong University 被引量:6
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作者 Shao-Ming Hu Sheng-Hao Han +1 位作者 Di-Fu Guo Jun-Ju Du 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2014年第6期719-732,共14页
The one-meter telescope at Weihai Observatory (WHO) of Shandong University is an f/8 Cassegrain telescope. Three sets of filters are installed in a dual layer filterwheel that use Johnson-Cousins UBVRI, Sloan Digita... The one-meter telescope at Weihai Observatory (WHO) of Shandong University is an f/8 Cassegrain telescope. Three sets of filters are installed in a dual layer filterwheel that use Johnson-Cousins UBVRI, Sloan Digital Sky Survey u′g′r′i′z′ and Stomgren uvby. The photometric system and the CCD camera are introduced, followed by detailed analysis of their performances, and determination of the relevant parameters, including gain, readout noise, dark current and linearity of the CCD cam- era. In addition, the parameters describing the site's astro-climate, including typical seeing, statistics on the number of clear nights and average sky brightness, based on data gathered from Sep. 2007 to Aug. 2013, are systematically studied and reported in this work. Photometric calibrations were done using Landolt standard star obser- vations spanning eight nights, which yielded transformation coefficients, photometric precision and system throughput. The limiting magnitudes are simulated using the derived calibration parameters and classic observation conditions at WHO. 展开更多
关键词 telescopes -- site testing --instrumentation: miscellaneous - tech-niques: photometric
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The site conditions of the Guo Shou Jing Telescope 被引量:1
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作者 Song Yao Chao Liu +18 位作者 Hao-Tong Zhang Li-Cai Deng Heidi Jo Newberg Yue-Yang Zhang Jing Li Nian Liu Xu Zhou Jeffrey L. Carlin Li Chen Norbert Christlieb Shuang Gao Zhan-Wen Han Jin-Liang Hou Hsu-Tai Lee Xiao-Wei Liu Kai-Ke Pan Hong-Chi Wang Yan Xu Fan Yang 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2012年第7期772-780,共9页
The weather at the Xinglong Observing Station, where the Guo Shou Jing Telescope (GSJT) is located, is strongly affected by the monsoon climate in north- east China. The LAMOST survey strategy is constrained by thes... The weather at the Xinglong Observing Station, where the Guo Shou Jing Telescope (GSJT) is located, is strongly affected by the monsoon climate in north- east China. The LAMOST survey strategy is constrained by these weather patterns. We present statistics on observing hours from 2004 to 2007, and the sky brightness, seeing, and sky transparency from 1995 to 2011 at the site. We investigate effects of the site conditions on the survey plan. Operable hours each month show a strong cor- relation with season: on average there are eight operable hours per night available in December, but only one-two hours in July and August. The seeing and the sky trans- parency also vary with season. Although the seeing is worse in windy winters, and the atmospheric extinction is worse in the spring and summer, the site is adequate for the proposed scientific program of the LAMOST survey. With a Monte Carlo simulation using historical data on the site condition, we find that the available observation hours constrain the survey footprint from 22h to 16h in right ascension; the sky brightness allows LAMOST to obtain a limiting magnitude of V = 19.5 mag with S/N= 10. 展开更多
关键词 telescopes - site testing - surveys
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气象观测场在汽车试验场中的应用研究
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作者 陈海建 《时代汽车》 2024年第14期172-174,178,共4页
汽车试验场作为汽车开展道路测试的重要场所,用于验证汽车产品的品质以及可靠性。除了场地道路外,气象条件作为汽车道路测试的重要一环,在《GB/T12534-1990汽车道路试验方法通则》中也有明确要求,如:试验时应是无雨无雾天气,相对湿度小... 汽车试验场作为汽车开展道路测试的重要场所,用于验证汽车产品的品质以及可靠性。除了场地道路外,气象条件作为汽车道路测试的重要一环,在《GB/T12534-1990汽车道路试验方法通则》中也有明确要求,如:试验时应是无雨无雾天气,相对湿度小于95%,气温0-40℃,风速不大于3m/s。同时气象条件也作为试验场道路管控的重要依据,实时风速、雨量、能见度等信息为场地管理者发布限速、限行、封场等通知提供必要参考依据,直接影响道路测试安全管控的及时性。因此,文章从气象观测场的建设、气象服务、异常天气道路管控等方面开展气象观测场在汽车试验场中的应用研究。 展开更多
关键词 汽车试验场 气象服务 道路管控 products. In addition to the site roads METEOROLOGICAL conditions are an important part of AUTOMOTIVE ROAD testing and there are also clear requirements in the GB/T12534-1990 General Rules for AUTOMOTIVE ROAD test Methods. For example the test should be conducted in rain and fog free weather with a relative humidity of less than 95% a temperature of 0-40 and a wind SPEED of no more than 3m/s. At the same time METEOROLOGICAL conditions also serve as an important basis for ROAD control in the test site. Real time information such as wind SPEED rainfall and visibility provides necessary reference for site managers to issue notices on SPEED limits site closures and traffic restrictions directly affecting the timeliness of ROAD testing safety control. Therefore this article conducts research on the application of METEOROLOGICAL observation siteS in AUTOMOTIVE testing siteS from the construction of METEOROLOGICAL observation siteS METEOROLOGICAL services and abnormal weather ROAD control.
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强风化岩中挖孔基础抗拔试验及荷载位移曲线模型参数研究 被引量:10
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作者 崔强 程永锋 +2 位作者 鲁先龙 谢枫 孙付涛 《岩土力学》 EI CAS CSCD 北大核心 2018年第12期4597-4604,4616,共9页
挖孔基础是目前我国山区架空输电线路强风化岩地基中最常用的基础形式之一。以强风化岩地基中的直柱型、扩底型两种结构型式的挖孔基础为研究对象,通过开展16个全尺寸基础现场抗拔试验,获得各试验基础和地表不同位置处的荷载-位移曲线... 挖孔基础是目前我国山区架空输电线路强风化岩地基中最常用的基础形式之一。以强风化岩地基中的直柱型、扩底型两种结构型式的挖孔基础为研究对象,通过开展16个全尺寸基础现场抗拔试验,获得各试验基础和地表不同位置处的荷载-位移曲线。试验结果表明:基础及地表的荷载-位移曲线整体变化特征相似,均可划分为初始直线段、中间曲线段和终了直线段3个特征段。采用M值表示相应阶段位移量占总位移的百分比,不同的特征段M值的大小不同,并且其值随着远离基础边缘而逐渐减小。分别对直柱型、扩底型两种结构型式的基础荷载-位移曲线进行归一化处理,采用双曲线模型获得无量纲荷载(Q/QL2)与上拔位移s之间的关系曲线,通过对比分析同种结构型式挖孔基础在黄土、强风化岩两种地基中荷载-位移曲线的差异性,得出地基岩土体抗剪强度参数c、Φ值与双曲线模型参数b值呈负相关,与基础抗拔承载力呈正相关。采用推荐的模型及参数对挖孔基础的荷载位移曲线进行预测,预测值与试验值吻合较好,从而验证了该模型及参数对于强风化岩地基挖孔基础荷载-位移变化行为预测的适用性。 展开更多
关键词 强风化岩地基 全尺寸挖孔基础 现场上拔试验 荷载-位移曲线 上拔极限荷载 双曲线模型参数
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Characteristics and Performance of the CCD Photometric System at Lulin Observatory 被引量:1
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作者 DaisukeKinoshita Chin-WeiChen +4 位作者 Hung-ChinLin Zhong-YiLin Kui-YunHuang Yung-ShinChang Wen-PingChen 《Chinese Journal of Astronomy and Astrophysics》 CSCD 2005年第3期315-326,共12页
The Lulin One-meter Telescope at Lulin Observatory in Taiwan started open-use observations in January 2003. In order to evaluate the performance of the CCD photometric system, the characteristics and quality of the si... The Lulin One-meter Telescope at Lulin Observatory in Taiwan started open-use observations in January 2003. In order to evaluate the performance of the CCD photometric system, the characteristics and quality of the site, we obtained data of photometric standards as well as calibration data from February to November 2004. We report here the results of our analysis including the gain, readout noise, dark current and linearity of the CCD camera, and transformation coefficients, total throughputs, night sky brightnesses and limiting magnitudes for UBVRI bands. 展开更多
关键词 instrumentation: miscellaneous - site testing - telescopes
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上覆浅层黏土的嵌固式岩石基础上拔试验研究 被引量:1
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作者 汪德敏 阮少林 刘长征 《黑龙江电力》 CAS 2015年第1期49-53,共5页
针对西南地区典型上覆浅层黏土岩石地基,进行现场真型嵌固式岩石基础上拔试验,得到基础上拔荷载-位移曲线、上拔荷载-基础边缘土体隆起位移曲线及水平荷载-位移曲线,分析了岩石基础的承载力特性及地基岩土体的破坏特征;根据试验上拔极... 针对西南地区典型上覆浅层黏土岩石地基,进行现场真型嵌固式岩石基础上拔试验,得到基础上拔荷载-位移曲线、上拔荷载-基础边缘土体隆起位移曲线及水平荷载-位移曲线,分析了岩石基础的承载力特性及地基岩土体的破坏特征;根据试验上拔极限承载力,反推出考虑上覆浅层黏土岩石等代极限抗剪强度取值,并采用极限平衡理论验算基础的稳定性,得出与现场试验结果基本吻合的结论。同时,通过与三种常规基础进行技术经济指标比较分析,得出嵌固式岩石基础经济效益优势明显且对自然环境影响破坏小,属于经济、环保型基础,用于西南山区岩石地基的输电线路中可行。 展开更多
关键词 岩石基础 现场上拔试验 承载力特性 等代极限抗剪强度 经济、环保型基础
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Spatial Model of Sky Brightness Magnitude in Langkawi Island, Malaysia
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作者 Mohammad Redzuan Tahar Farahana Kamarudin +5 位作者 Roslan Umar Mohd Khairul Amri Kamarudin Nor Hazmin Sabri Karzaman Ahmad Sobri Abdul Rahim Mohd Sharul Aikal Baharim 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2017年第4期57-66,共10页
Sky brightness is an essential topic in the field of astronomy, especially for optical astronom- ical observations that need very clear and dark sky conditions. This study presents the spatial model of sky brightness ... Sky brightness is an essential topic in the field of astronomy, especially for optical astronom- ical observations that need very clear and dark sky conditions. This study presents the spatial model of sky brightness magnitude in Langkawi Island, Malaysia. Two types of Sky Quality Meter (SQM) manu- factured by Unihedron are used to measure the sky brightness on a moonless night (or when the Moon is below the horizon), when the sky is cloudless and the locations are at least 100 m from the nearest light source. The selected locations are marked by their GPS coordinates. The sky brightness data obtained in this study were interpolated and analyzed using a Geographic Information System (GIS), thus producing a spatial model of sky brightness that clearly shows the dark and bright sky areas in Langkawi Island. Surprisingly, our results show the existence of a few dark sites nearby areas of high human activity. The sky brightness of 21.45 mag arcsec-2 in the Johnson-Cousins V-band, as the average of sky brightness equivalent to 2.8 × 10-4cd m-2 over the entire island, is an indication that the island is, overall, still relatively dark. However, the amount of development taking place might reduce the number in the near future as the island is famous as a holiday destination. 展开更多
关键词 light pollution - atlases - site testing - methods data analysis
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等截面抗拔桩承载力现场试验与数值模拟分析
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作者 宗文亮 《浙江交通职业技术学院学报》 CAS 2023年第4期7-12,共6页
为了研究等截面抗拔桩工程现场承载力规律特征和土层性质对承载力影响,开展了上海铁路南站南广场地下工程C1型抗拔桩承载力现场试验,抗拔桩充分发挥抗拔承载力需要抗拔桩达到20~30mm的上拔量。采用ABAQUS有限元软件建立“桩-土”有限元... 为了研究等截面抗拔桩工程现场承载力规律特征和土层性质对承载力影响,开展了上海铁路南站南广场地下工程C1型抗拔桩承载力现场试验,抗拔桩充分发挥抗拔承载力需要抗拔桩达到20~30mm的上拔量。采用ABAQUS有限元软件建立“桩-土”有限元计算模型,反演计算上海铁路南站南广场C1型抗拔桩现场试验结果,验证了有限元模型与现场实际吻合,能够较好地模拟抗拔桩的试验过程。并且分析了土体在弹性模量为10MPa、20MPa、30MPa,粘聚力为5kPa、10kPa、15kPa,内摩擦角为20°、14°、10°等不同参数情况下对抗拔桩承载力的影响,得出了土体的内摩擦角对抗拔桩的影响效果最大,抗拔桩的极限承载力和桩顶上拔量随着土体摩擦角的减小而显著增加的相关结论。 展开更多
关键词 等截面抗拔桩 承载力 有限元 现场试验 数值模拟
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湿陷性黄土地区扩体锚索拉拔试验分析
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作者 杨化冰 张剑 《工程技术研究》 2023年第14期105-107,共3页
我国西北地区存在广阔的湿陷性黄土场地,虽然扩体锚索技术是近年来国内外岩土工程界的热点锚索技术,但是关于湿陷性黄土扩体锚索的现行研究较少。文章选择某湿陷性黄土边坡支护工程实例,对3根一组的扩体锚索进行拉拔试验,试验结果表明:... 我国西北地区存在广阔的湿陷性黄土场地,虽然扩体锚索技术是近年来国内外岩土工程界的热点锚索技术,但是关于湿陷性黄土扩体锚索的现行研究较少。文章选择某湿陷性黄土边坡支护工程实例,对3根一组的扩体锚索进行拉拔试验,试验结果表明:扩体锚索在湿陷性黄土中具有较好的适用性,不仅可以节约锚杆材料的使用,而且能够提高其承载力,研究结果可为类似工程基坑支护设计提供参考。 展开更多
关键词 扩体锚索 现场试验 湿陷性黄土 抗拔承载力
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喀斯特地区短桩锚杆复合基础现场抗拔试验及设计方法研究 被引量:11
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作者 崔强 邢明 +1 位作者 杨文智 丁士君 《岩石力学与工程学报》 EI CAS CSCD 北大核心 2018年第11期2621-2630,共10页
针对喀斯特地区输电线路工程中普遍存在的上覆厚土层(4~7m)、下卧中等风化及以上岩石的特殊地基条件,提出一种短桩锚杆复合基础。为了揭示复合基础的承载机制,建立相应的工程设计方法,推动这种新型基础在工程中的应用,选取位于广东阳春... 针对喀斯特地区输电线路工程中普遍存在的上覆厚土层(4~7m)、下卧中等风化及以上岩石的特殊地基条件,提出一种短桩锚杆复合基础。为了揭示复合基础的承载机制,建立相应的工程设计方法,推动这种新型基础在工程中的应用,选取位于广东阳春典型喀斯特地区的上覆粉质黏土、下卧微风化石灰岩的地基作为试验现场,依据我国110~1 000 kV电压等级输电杆塔承受的上拔荷载,设计出6个不同入土深度、不同锚筋数量的1∶1全尺寸短桩和复合基础,通过开展现场抗拔承载特性试验,获得试验基础的荷载位移曲线、抗拔承载力、地基破坏模式等规律,进一步揭示复合基础的抗拔承载机制;结合现场试验结果与理论分析,提出复合基础的失效是由其下部锚杆基础破坏时对应的上拔位移所控制,在此基础上建立复合基础抗拔承载力的计算公式,并给出复合基础失效位移以及承载力分配系数的确定方法。通过与现场试验结果的对比,验证所给方法的正确性,为该类新型基础在工程中的推广应用提了理论依据。 展开更多
关键词 桩基础 现场抗拔试验 承载机制 抗拔承载力 失效位移 承载力分配系数
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