The Bifurcation of the Topological Structure in the Sunspot's Electric Topological Current with Locally Gauge-invariant Maxwell-Chern-Simons Term

The topological structure of the electric topological current of the locally gauge invariant Maxwell-Chern-Simons Model and its bifurcation is studied. The electric topological charge is quantized in term of winding number. The Hopf indices and Brouwer degree labeled the local topological structure of the electric topological current. Using Φ-mapping method and implicit function theory, the electric topological current is found generating or annihilating at the limit points and splitting or merging at the bifurcate points. The total electric charge holds invariant during the evolution. This revised version was published online in July 2006 with corrections to the Cover Date.     

化肥在农业生产中的地位与作用

化肥是提高作物产量的物质基础, 在过去的几十年中, 它在世界农业建设中起过巨大作用。近百年的肥料试验表明, 化学肥料具有和有机质一样的持续增产效果, 在提高作物产量、品质的同时, 还可培肥土壤。随着化肥工业的发展, 化肥的负作用会逐渐减小。     

ESTIMATION OF ARTIFICIAL PRECIPITATION ENHANCEMENT RESOURCE CONDITION AND CLOUD SEEDING POTENTIAL BY GROUND-BASED REMOTE SENSING DATA*

In this paper,the data of continuous atmospheric vertical integral vapour and liquid water content during April-June of 1992-1994 obtained by a ground-based dual-channel microwave radiometer are used to analyse the statistical characteristics of atmospheric vapour and liquid water content,and the relative distribution characteristics of vapour and liquid water content in cloudy atmosphere,the correlative relation of integral liquid water content L and ground precipitation intensity I.and precipitation transform rate of precipitation system.Finally,the weather modification condition of precipitus stratiform clouds and seeding potential is analyzed and discussed.     

近40年湖南洪涝灾害的演变趋势及其成因

利用湖南５２个代表站１９５８￣１９９８年４￣９月的降水资料,确定了洪涝年,分析了近４０年湖南洪涝的特征和演变趋势。在此基础上,探讨了近期洪涝灾害日益严重的原因。它们是：气候背景因素,大气环流异常,厄尔尼诺的影响,洞庭湖的水文特性和面积锐减,社会因素。     

GMS实时资料识别冰雹研究

利用１９９７￣１９９８年３￣４月ＧＭＳ－５的红外亮温和水汽亮温资料,根据云南春季冰雹和非冰雹的红外、水汽亮温值二维概率分布,建立数学判别式、结果表明,我必 非冰雹的识别率为９４％,冰雹判虽准确率为３０．８％。     

High resolution UAV image acquisition method and modeling practice for geological outcrop with a large slope

The observation on the outcrop in the field is one of the most direct and efficient methods to obtain the underground formation information, which provides the most direct first-hand geological data for geological science research. However, the traditional outcrop investigation, especially for the outcrop with a large slope and unreachable area, mainly relies on the inspection, measurement of the slope bottom, and photos to record outcrop information, making it difficult to accurately characterize the whole geological body. Consumer unmanned aerial vehicle (UAVs) with the advantages of good mobility, strong adaptability and low cost, can obtain outcrop images from a short distance, multiple perspectives and varying heights. In this paper, the image acquisition method and model construction accuracy without control points available for the geological outcrop with a large slope are discussed. Consumer UAVs is used to capture images through vertical route and then the geological model is set up. The results show that oblique photogrammetry technology combined with consumer UAVs can effectively build a large slope geological outcrop model with millimeter resolution. The model has the characteristics of high resolution, uniform resolution and high measurement accuracy up to millimeter, which can effectively reduce the difficulty of field investigation and the personnel safety risk, thus it accurately reproduces the outcrop situation with large slope in the field, providing a real and reliable data basis for the section interpretation, analysis and measurement of large slope outcrop.     

云南暴雨涡散场动能转换函数的动态分析

对1996年云南主汛期（6－8月）逐日散度风动能和旋转风动能之间的转换函数C（KD,KR）特征进行深入研究,同时分析了C（KD,KR）各项Af、Az、B、C在动能转换函数中所起的作用。研究结果表明,对流层内C（KD,KR）＞0,同时对流层低层的C（K,KR）＞中高层的C（KD,KR）之和．极易出现暴雨过程;Af项在整个动能转换中起主要作用,71％的Af与C（KD,KR）具有相同的符号,Az项和B项在动能转换中起振荡作用,Az＋B控制着29％的动能转换方向。     

数字台网无线网络运行中仪器设备故障分析

本文对数字台网中心无线网络中的仪器及传输设备引起的故障进行总结。     

数字地震仪(或雷达)的文件格式及其转换方法

详细介绍了ＳＥＧ新规定的ＳＥＧ－２标准及其文件结构,这一标准不但适用于数字地震仪,而且也适用于地质雷达等数字化记录设备。同时给出了一个在ＩＢＭ－ＰＣ环境不读取ＳＥＧ－２数据文件的Ｃ语言示范程序,根据这个示范程序,用户可以很方便地将ＳＥＧ－２数据文件转换成适用于特定应用软件的数据格式。     

新疆伽师地震的近场观测和对它的初步认识

1998年5月～7月中国地震局物探中心在伽师震区布置了一个40×50km2的三维地震观测台网,布置了19台轻便地震仪,在二个月的时间里接收到近700个地震事件,并接收了十一个炮点的人工地震资料.对天然地震资料进行了精确定位,震级大于26的地震计算了震源机制解,并进行了讨论.最后对伽师10次6级以上地震的震中位置及能量的释放过程以及与坷坪断裂的关系进行了初步探讨