Differences in ratios of stable isotopes of nitrogen in long-finned pilot whales (Globicephala melas) in the western and eastern North Atlantic   总被引：1，自引：0，他引：1  

Abend  Alan G.; Smith  Tim D. 《ICES Journal of Marine Science》1995,52(5):837-841

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施放氢气球时存在的安全隐患及防范措施     

张学成  侯俊岭  王军 《山西气象》2002,(2):38-39

针对采用球服务中的安全隐患，提出有效的防范措施，对开展此项工作的同志有很好的借鉴意义。  相似文献   

A New Tethered Balloon-Borne Payload for Fine-Scale Observations in the Cloudy Boundary Layer     

Holger Siebert  Manfred Wendisch  Thomas Conrath  Ulrich Teichmann  Jost Heintzenberg 《Boundary-Layer Meteorology》2003,106(3):461-482

A new scientific payload is introduced for fine-scale measurements of meteorological (wind vector, static air temperature, humidity, and air pressure) and microphysical (aerosol particles and cloud droplets) properties, suspended below a tethered balloon. The high resolution sensors and the tethered balloon are described. Measurements in a lifted fog layer from a first field campaign are presented.The detailed investigation of the fog/haze and the temperature inversion layer demonstrates the damping influence of the fog on temperature fluctuations, while thewind fluctuations are significantly decreased by theevolving temperature inversion, whichwas about 30 m above the fog layer.From spectral analysis the noise floors of the high-resolution sensors are determined to10^-6 kg m^-3 for the LWC (liquid water content) and 4 mK for the fast temperature sensor (UFT-B). The correlation betweentemperature and LWC structures in shallow haze layers is investigated. The release of latent heat and the corresponding warming in the haze of about 0.1 K could be quantified.  相似文献   

气球携带碘化银焰弹技术研究   总被引：1，自引：1，他引：1       下载免费PDF全文

秦长学 《气象》1997,23(11):11-13

主要介绍在北京地区开展气球携带碘化银焰弹雨雪作业的作业技术，经济效益等问题。通过各种增雨雪技术比较，认敢球携带碘化银焰弹增雨雪作业在北方干旱地区的抗旱工作中或作为收音机增雨雪作业的补充手段具有应用价值  相似文献   

BALLOON-BORNE MEASUREMENTS OF AEROSOL VERTICAL DISTRIBUTIONS OVER BEIJING DURING THE SUMMER AND AUTUMN OF 1993          下载免费PDF全文

Zhou Jun  Tan Kun  Shao Shisheng  Gong Zhiben  Shi Guangyu  Guo Jiandong  Wang Biao  Zhang Baowu  Sun Baolai  Yasunobu Iwasak  Masahiko Hayashi  Masahiro Hase 《Acta Meteorologica Sinica》1994,8(4):478-487

The results of two balloon soundings during the summer and autumn of 1993 from the Xianghe Observation Station are being utilized in a study of the temporal and spatial distribution of the atmospheric aerosols.The balloon,gondola,instrumentation and atmospheric conditions during the observation period are described.The temporal and spatial characteristics of aerosol concentration,size ratio,mixing ratio,and size distribution for both troposphere and strato-sphere are presented and analyzed.  相似文献   

Balloon-borne measurements of NO2: can a comparison of remote techniques be made from the historic data?     

Roscof  H. K. 《Journal of Atmospheric Chemistry》1986,4(4):479-490

When all balloon-borne measurements of NO₂ in the stratosphere are reviewed, the profiles show a wide spread. Measurements of the total amount in a vertical column suggest that variability should be low when only profiles measured at mid-latitudes close to equinox are selected. With this selection, the standard deviation of the profiles measured by each technique is often less than ±20%, but the mean profiles measured by each technique differ by up to a factor 2. Despite the profiles not being measured simultaneously, these differences are identical to those revealed by the simultaneous measurements of the Balloon Intercomparison Campaigns of 1982 and 1983-a comparison can be made from the historic data alone. This suggests that measurements of other gases should be similarly reviewed and appropriate selection criteria be found that reduces the standard deviations of the measurements by any one technique. The techniques can then be intercompared without new simultaneous flights.  相似文献   

大气臭氧与气溶胶垂直分布的高空气球探测   总被引：17，自引：2，他引：17  

石广玉  许黎  郭建东  张豹武  孙宝来  龚知本  周军  谭锟  岩坂泰信  林政彦  长谷正博 《大气科学》1996,20(4):401-407

本文给出了1993年9月12日利用高空科学气球在河北省香河地区探测到的大气臭氧和气溶胶的垂直分布。结果发现:(1) 大气臭氧的数密度在整个对流层较低(～10[12]mol/cm3)，并从地面到对流层顶略有下降；对流层顶以上开始快速增加，极值层高度在～24 km，其值为4.78×10[12]mol/cm3；臭氧分压有类似的分布特征，极值146×10[-4]Pa，位于同一高度；(2) 在平流层低层，臭氧分压有一个次极值62×10[-4]Pa，位于15～16 km；(3) 0～30 km大气气溶胶数密度呈现出三个峰值:143，8和1.1 个/cm[3]，分别位于近地面、5 km和21 km；（4）气溶胶的数密度谱在对流层为双模态；在平流层，次峰消失。同时，我们还与其他观测结果作了比较分析。  相似文献   

辽东湾丛式钻井陀螺侧钻及导向钻井防碰技术     

姜伟 《四川地质学报》1992,(4)

本文介绍渤海辽东湾实验区AI平台丛式定向井最后钻完的3口侧钻绕障井。在有邻井和本井套管磁干扰情况下,特别是与邻井间距最小仅为0.6m,采用陀螺定向侧钻以及导向钻井技术相结合,安全顺利的钻完了这3口井。总结和介绍了侧钻、防碰的工艺特声,以及安全措施。研究和分析了使用陀螺定向侧钻,钻速与造斜率,井眼轨迹合理控制等问题。  相似文献   

煤矿1号大口径瓦斯抽排井施工实践     

周喜顺  齐路恒  李春杰 《中国煤田地质》2006,(Z1)

宣东二号矿布设施工的大口径瓦斯抽放井以小口径导向钻进,后逐级扩孔成井。总结了该孔施工过程中的主要技术经验,如导向孔粗径钻具组合、钻压控制、钻井液使用以及下管和固井等,提出了其中存在的问题以及下一步改进的建议。  相似文献   

闽南地区综合防震减灾示范工程应急指挥中心硬件系统概述     

杨成林  朱海燕  杨孝宇 《福建地震》1998,(3)

本文详细介绍了福建闽南地区综合防震减灾示范工程一应急指挥系统的硬件构成,运作及其特点,并对存在的一些问题作了初步的探讨。  相似文献