1m红外太阳望远镜光电导行系统中像场旋转的分析

云南天文台1m红外太阳望远镜(YNST)光电导行系统是基于检测太阳像在面阵CMOS图像传感器上的偏移量作为反馈控制信号的高精度闭环跟踪系统[1]。由于YNST是一个地平式装置,在太阳像偏移检测量中存在着像场旋转量,为了获取稳定清晰的太阳像,必须对检测量进行消旋[2]才能达到光电导行系统的跟踪要求。根据球面天文学及天体测量学的知识并结合导行镜的光学系统,推导了光电导行系统中像场旋转的变化规律并对其进行模拟分析。     

Auto CAD技术在市政工程系列图成图上的应用

本文通过对ＡｕｔｏＣＡＤ技术的二次开发，实现了市政工程系列图图形的直观显示、编码管理、快速成图等功能。     

利用自动空三方法制作城市彩色数字正射影像图

本文主要从实际应用的角度出发,介绍了自动空中三角测量方法和彩色数字正射影像图的制作过程;总结了一些经验;提出了见解和今后有待于进一步研究的问题。     

矿井地质图件绘制中Auto CAD的应用

简要介绍了Auto CAD的特点及其在矿井地质图件绘制中的应用技巧,阐述了完成一幅地质图件的基本步骤,推荐了钻孔平面图绘制的专业化程序。      

自动海洋气象监测数据库及其WEB开发应用

结合胜利油田近海自动海洋气象监测系统的建设,介绍了自动监测系统的构成与数据库设计及其WEB应用平台的功能和主要技术方法。     

求近似冲激响应的一种时域方法

本文提出一种用输入信号自相关函数集求近似冲激响应的方法,并作出误差评价。     

南沙群岛北部海域鸢乌贼(Sthenoteuthis oualaniensis)夏季渔业生物学研究

采用自动鱿钓(AJ)和灯光罩网(LAFN)定点采样,对南沙群岛北部海域(12—16°N,112—116°E)鸢乌贼生长、繁殖、摄食及资源分布等进行研究。结果表明:灯光罩网渔获中鸢乌贼的胴长范围为65—231mm,体质量范围为6—580g;自动鱿钓鸢乌贼胴长范围为108—215mm,体质量范围为38—400g。自动鱿钓和灯光罩网鸢乌贼雌雄性比分别为32.0和1.4。南沙鸢乌贼雌性个体出现两个性腺发育高峰期,即101—120mm与161mm以上胴长组,4—7月为繁殖高峰期。鸢乌贼以大眼标灯鱼、尖头燕鳐等中上层鱼类为主,还摄食同类以及钩腕乌贼属等其它头足类及少数蟹类,雌雄个体摄食强度随胴长增加而增加。自动鱿钓CPUE(单位捕捞努力量渔获量)为1—38pc/(line·h),平均值为12pc/(line·h);而灯光罩网CPUE为15—50kg/net,平均值为35.7kg/net。南沙群岛北部海域鸢乌贼具有重要的经济学和营养生态学研究价值,灯光罩网是开展南海鸢乌贼渔业资源研究的较佳采样方式。     

地震自动速报综合触发系统产出结果评估

收集2015年1月—2020年8月地震自动速报综合触发系统的全部产出结果,选取国内天然地震事件结果共计1863条,与正式速报目录结果进行对比研究。研究结果显示,自动速报系统所产出的地震参数较正式速报目录发震时刻平均偏差约2s,震中位置平均偏差约8km,震源深度平均偏差约9km,震级绝对平均偏差约0.25,偏差均值为自动速报结果较正式速报结果偏大约0.1。到达产出震级标准的漏报地震事件176个,其主要原因为区域台站稀疏、台站分布不均匀、大震或前震尾波干扰等,未发生误报事件。发震时刻、震中位置和震源深度偏差较大事件的分布与漏报事件类似,多发生于台站密度较低、台站分布不均匀和速度模型与实际差异较大的地区。震级偏差主要与地震事件震级大小和震中所在位置有关,对于3.0≤M<5.0的地震事件,产出震级最为稳定,而对于M≥6.0的地震,震级结果可靠性较低;此外,震级偏差的大小与区域分布并无明显关系,但偏差方向具有区域特征。通过对自动速报系统运行情况的统计分析,提出了关于自动速报系统改进与完善的建议,有助于提高自动速报系统的应用效果。     

High-resolution study on the hydrochemical variations caused by the dilution of precipitation in the epikarst spring: an example spring of Landiantang at Nongla,Mashan, China

In addition to rainfall, high-resolution measurements of water level, pH, specific conductivity and temperature of Landiantang epikarst spring at Nongla, Mashan county in Guangxi Province, China were recorded in summer rainy season by using a data logger with time interval of fifteen minutes. Water from the spring issues along a karst conduit. During the rainstorms in summer, it was found that the pH and temperature of Landiantang spring increased while its specific conductivity decreased. As HCO₃ ⁻, Ca²⁺ and Mg²⁺ are the dominant ions, linear relationships between concentrations of those ions and specific conductivity were developed. According to the ion concentrations from the linear relationships, the saturation indexes of calcite (SI_C), the saturation indexes of dolomite (SI_D) and CO₂ partial pressure (Log ) of the spring were calculated. Results indicated that the Log of the spring during the rainstorms was lower than that without rain, and its SI_C and SI_D was also lower. Combined with the characteristics of the epikarst zone, it was inferred that the above results were caused by the dilution of rainwater, because overland flow with high pH (due to neutralization of carbonate rock dusts in the air to rainwater) and low specific conductivity traveling through the conduit rapidly during rainstorms, showed greater influences on the hydrochemical variations of the epikarst spring.     

Oil,the European Dilemma,a Study in Economic and Political Geography

Abstract

Marion Clawson. Land for Americans. Resources for the Future Policy Background Series. Rand McNally and Co., P.O. Box 7600, Chicago 80, Ill., 1963. 141 pages with table of contents and black and white illustrations. $2.00.

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Jane Lyon. Clipper Ships and Clipper Captains. American Heritage Co., Inc., 551 Fifth Ave., New York 17, N.Y., 1963. 153 pages with color and black and white illustrations. $3.95.

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Floyd Miller. Ahdoolo! The Biography of Matthew A. Henson. E. P. Dutton and Co., Inc., 201 Park Ave., S., New York 3, N.Y., 1963. 221 pages. $4.50.

Edna Mason Kaula. The Land and People of Tanganyika. J. B. Lippincott Co., E. Washington Sq., Philadelphia 5, Pa., 1963. 155 pages with table of contents, two maps, index and photographs. $2.93.

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C. William Harrison. The First Book of Wildlife Sanctuaries. Franklin Watts, Inc., 575 Lexington Ave., New York 22, N.Y., 1963. 61 pages with maps, black and white pictures and an appendix regarding some of the United States' national wildlife refuges. $2.50.

Denis Baly. Geographical Companion to the Bible. McGraw-Hill Book Co. Inc., 330 West 42nd St., New York 36, N.Y., 1963. 196 pages with maps, photographs, place-names and subject index. $5.95.

David J. Bowen. The Land and People of Peru. J. B. Lippincott Co., E. Washington Sq., Philadelphia 5, Pa., 1963. 160 pages with table of contents, index, black and white photographs and one map. $2.93.

Victor E. Shelford. The Ecology of North America. University of Illinois Press, Urbana, Ill., 1963. 610 pages. $10.00.

Richard F. Burton, edited by Fawn M. Brodie. The City of the Saints and Across the Rocky Mountains to California. Alfred A. Knopf, 501 Madison Ave., New York 22, N.Y., 1963. 654 pages with table of contents, editor's introduction, appendices and index. $8.50.

Devereux Butcher. Exploring Our National Parks and Monuments (prepared under the auspices of the National Park Association), fifth edition, third revised printing. Houghton Mifflin Co., 2 Park St., Boston 7, Mass., 1963. 288 pages with table of contents, more than 300 colored and black and white pictures and three maps. $6.50.

Jacques M. May, M.D. “The Ecology of Malnutrition in Five Countries of East-Central Europe,” Studies in Medical Geography, Vol. 4. Hafner Publishing Co., 31 East Tenth St., New York 3, N.Y., 1963. 292 pages with table of contents, index and black and white maps. $10.50.

William G. Tyrrell. We New Yorkers. Oxford Book Co., 71 Fifth Ave., New York 3, N.Y., 1963. vi and 294 pages with table of contents, maps, photographs, drawings and index. $2.75 (net school price).