|
The solution method of electromagnetic interference of radar equipment depends on the precise analysis of interference.The 714C weather radar at Kunming airport is interfered by the surveillance radar equipment of the Airforce.With a practical example,the analysis process of high power pulse′s interference to radar transmitter is introduced and a solution method is also proposed. 雷达设备电磁干扰的解决方法,依赖于对干扰的准确分析。通过昆明机场714C气象雷达受空军警戒雷达干扰的实例,介绍了一种高功率脉冲对雷达发射机干扰的分析过程,并提出解决方法。 This paper reported the result of an investigation on rats at Kunming airport during April of 1997 to March of 1998. Rats were caught with cages and clips and rat density was measured by the method which rat cages and slips were put in the early evening and fetched in the morning once a month. A total of 305 rats were caught,and subordinate to 2 orders 3 families 5 genera 6 species. Rat density was 23.0% (305/1328) ,Rattus norvejicus is a species of superior rat at Kunming airport. There are two peaks period... This paper reported the result of an investigation on rats at Kunming airport during April of 1997 to March of 1998. Rats were caught with cages and clips and rat density was measured by the method which rat cages and slips were put in the early evening and fetched in the morning once a month. A total of 305 rats were caught,and subordinate to 2 orders 3 families 5 genera 6 species. Rat density was 23.0% (305/1328) ,Rattus norvejicus is a species of superior rat at Kunming airport. There are two peaks period of rat density in the year June to August and Fefruary to April .respectively. Kinds of rats are composed of Rattus norvejicus 58. 0% (177/305) ,R. flavipectus 17. 8% (54/305) ,Mus Musculus 2. 6% (8/305), Eothenomys miletus 1. 3% (4/305 ) , Apodemus chcverieri 11. 5% (35/305)and Suncus murinus 8. 9%(27/305). Domestic rats are main kinds and take 78. 4% (239/305) , wild rats take 21. 6% (66/305). The result of this investigation showed that rat harm is very serious at Kunming airport. It is very necessary to take effective measures to exterminate rats and control of rat density to prevent prevalent of contagious disease of tat vectors 本文报告了1997年4月至1998年3月对昆明机场进行鼠类调查的结果。用笼夹捕鼠、夹夜法测定鼠密度,共捕鼠305只,隶属2目3科5属6种,鼠密度为23.0%(305/1328),褐家鼠为机场优势鼠种,全年鼠密度有二个高峰期,分别是6~8月和2~4月。鼠种构成为:褐家鼠58.0%(177/305)、黄胸鼠17.8(54/305)、小家鼠2.6%(8/305)、大绒鼠1.3%(4/305)、齐氏姬鼠11.5%(35/305)、臭鼩鼱8.9%(27/305),其中以家栖鼠类为主,78.4%(239/305),野栖鼠类占21.6%(66/305)。调查结果表明:昆明机场鼠害严重,必须采取有效的灭鼠措施、科学的灭鼠方法,才能降低机场鼠密度,消除鼠媒传染病流行的隐患。 An Investigation of mosquito was carried out at Kunming airport during 1997 -1998. A total of 2366 mosquitoes were captured,and subordinate to 6 species. A species of superior mosquitoes is Pipient quinquefascitatus and it takes 69. 06%. Peak period of mosquito density was between May and July. 1997年5月至1998年4月,在昆明机场捕获蚊虫2366只,经鉴定计有6种。其中致倦库蚊为该机场的优势蚊种,占69.06%,且夜间活动持续时间长;其密度高峰出现在5至7月。
|