国外大气科学期刊的统计与分析

本文通过对国外大气科学刊物和文献的统计计算,确定出了国外大气科学的核心期刊,文献的学科分布、时序变化及半衰期。     

双点后方交会解算方法探讨

双点后方交会问题,中外专家学者已研究多年,发表了不少有关论文。本文利用坐标交换原理,提出了一种新的解算方法,并设计了计算表格,作了实例计算,推理简明,计算方便。     

云南洞穴金线鲃属鱼类(鲤科)一新种

描记采于罗平县—地下河金线鲃属一新种,命名为瓦状角金线鲃Sinocyclocheilus tileihornesMao,Lu et Li,sp.nov。新种外形与犀角金线鲃S.rhinocerous Li et Tao(1994)相近,但新种无侧线鳞,角顶部分叉呈瓦状,腹鳍较长,后伸超过肛门或达到臀鳍起点可与之相区分。     

香蕉新品系“93—1”选育初报

从香蕉（Musa AAA）组织培养繁殖后代中，选育出特长果指香蕉新品系“93-1”，主要特点为植株表现中矮秆（216cm），茎粗中等（67.1cm），苗期叶色浓绿，叶形椭圆形，叶形比（长／宽）1.91，叶尖急尖，叶基凹陷呈耳垂状；果穗7-12梳，平均8．07梳／穗，穗长81.6cm，单穗重22．8kg，单果重213．5g，果指数123．4条／穗，果指特长（25＋8cm）；可溶性固形物含量21．8％；全生育期321d（春植）至368d（夏植），约44片叶。“93—1”适宜在广东雷州半岛及海南岛栽培种植。     

饲喂锌杆菌肽能增进鸡蛋中维生素A的沉积

对生产性的农畜使用抗生素能够促进生长,并能增进肝脏中维生素A的沉积,其确实效果已被公认。最近,法国研究了抗生素对鸡蛋中维生素A沉积的影响。将两个不同杂交系的产蛋鸡,置于商品生产农场的条件下,饲喂工厂生产的配合饲料。两个试验组的饲料中分别添加了10ppm     

贵州洞穴金线鲃一新种

描记采于贵州省荔波县茂兰自然保护区范围内一地下河中的金线鲃属一新种，以采集地县名命名荔波金线鲃Sinocyclocheilus liboensis．sp．nov。新种外形与广西凌云金线鲃相似，但前者鳃耙少，仅4—5，后者9—10；前者眼间距较窄，头长为眼间距的3．4～3．6倍，后者2．4～3．0(2．8)倍；前者尾柄较细，尾柄长为尾柄高的1．8倍，后者1．3～1．6(1．46)倍；前者侧线鳞与体鳞一致，侧线上下鳞分别为28—30和16—18，后者侧线鳞大于体鳞，侧线上下鳞为14—17和8一ll。     

云南鲤科鱼类一新种记述

描记采于云南东部的鲤科鱼类一新种，命名为多依河白鱼Anabarilius duoyiheensis Li,Mao et Lu sp,nov。新种鳃耙少，仅7－8；背鳍具硬刺；胸鳍长后伸超过至腹鳍基距离的2／3，可明显区别于大鳞白鱼Anabarilius maorolepis Yih et Woo。     

Retrieval of chlorophyll a and suspended solid concentrations by hyperspectral remote sensing in Taihu Lake, China

Chlorophyll α（ch1-α） and suspended solid concentrations are two frequently used water quality parameters for monitoring a lake. Traditional measurement of ch1-α and suspended solids, requiring laborious laboratory work, which is often expensive and time consuming. Hyperspectral remote-sensing measurement provides a fast and easy tool for estimating water trophic status. In situ hyperspectral data on March 7-8, July 6-7, September 20 and December 7-8, 2004 and the corresponding water chemical data were used to regress the algorithm of water quality parameters. Results showed that the peak of water leaving radiance around 700 nm （R700） varied proportionally with ch1-α concentration, and moved to infrared when algal bloom occurred. The reflectance ratio of R702/R685 was well correlated with ch1-α when water surface in no algal bloom case and the correlation coefficient was better if absorption of phycocyanin was considered. The reflectance ratio R620/R531 was highly correlated to the concentration of suspended solids. The relationship between suspended solids and other band groups were also compared. Secchi disk depth could be calculated by non-linear correlation with suspended solids concentration.     

城市地下管线探测分析

本文阐述了地下管线探测对城市建设、规划管理和国民经济发展的重要性;分析了我国目前管线探测现状和方法;讨论了今后管线探测的新技术应用和发展方向。