本底

Basing on the fast Fourier transform.The fluorescence lifetime is obtained from the tangent function of the phase angle of the first nonzeroth items of the FFT result.This method has advantages such as quick calculation,high accuracy and immunity to the base signal.

基于快速傅里叶变换的拟合方法，从第一个非零项的相位角的正切值得出被测的荧光寿命，具有速度快、误差小、不受本底干扰等优点。

As in the past years, traces of artificial radionuclides, namely caesium-137, tritium

平均在正常本底变化范围之内。与过去的情况相若，天文台在

According to the Doppler effect, the multi-peak H(subscript α) spectra is obtained, which are emitted by the neutral beam and separated from the unshifted H(subscript α).

根据多普勒效应，中性束中的氢粒子发出的H波长偏离本底的H波长，波长偏移量与氢粒子的能量相关，从而在光谱仪上得到多峰H谱线。

With the algorithm for searching valid spots, the rmsemittance formula programming is realized successfully. The author solved theproblem of an image data converted into void data except to the background.

作者研发了rms发射度的数值统计公式计算发射度的程序，研发了快速寻找有效光斑的算法，解决了把整幅束流图像剔除本底后快速转化为有效数据，使束流发射度的软件测量系统成为一个在线软件系统。

CLIA using acridinium ester derivatives as chemiluminescent label has advantages of low background,high signal-to-noise ratio,no need of catalyst and simple luminescence system.

以吖啶酯衍生物为发光标记物的CLIA的特点是：标记简单、标记物稳定、不需要催化剂、自然本底低、受外界干扰因素少、信噪比高、发光体系简单等。

The purpose of this study is to find the effect of dietary fiber on glucose and lipid absorption. The dietary fiber we used is Amorphophallus Konjac, the traditional food in many areas in China.

因为营养物质在人体内吸收代谢要经过一系列物理化学过程，影响该过程的因素可引起δ值本底波动。

Objective To calculate the least acoustic response value of children aged 0-6 years in a quiet room, and to explore the positive standards of hearing screening at different ages in some nonstandard audiometric room.

目的计算0-6岁儿童在相对安静房间(本底噪声≤45dB A)测听的最小听觉反应值，探讨在非标准测听室进行儿童听力筛查不同年龄组的筛查阳性标准。

The comparative study on vegetation background survey of the stationsand the comparison on level of phytocoenology on zonal habitats indicates thatthe diminishment of the numbers of families,genus and species,compositionof life types,diversity of communities and habitats,;and the increscence in theproportion of photosynthesis functional groups of C3/C4 plant,richness ofspecies,density of tussock and tiller,diversity of species,evenness,leaf areaindex,leaf area duration,dry matter production of communities alongside thelatitude increasing and the temperature decreasing;and the dynamic curve ofthe community productivity also tend to steadily increase along with thetemperature going up and the heat accumulation gradually in moderate-temperate steppe station from violent fluctuation along with seasonal badly-distribution of precipitation in warm-temperature steppe station;manifestingthat transformable tendency of productivity pattern of the community from morevigorous net assimilation,sparser and higher crops stricture of tussock and tiller,and possession on more resources by less species inclined to thicker in densityof crops,superior effectiveness of multi-leaves and pattern of multi-speciesresource sharing,reflecting that bigger disparity of the vegetationcharacteristics and the style of the community growth in the two differentthermal-type steppe stations owing to background of natural-historicenvironment and combination of water and heat.

内蒙古草原区两个不同热量型研究站点植被本底调查和显域地境群落学水平的比较研究表明：随纬度增加和气温降低，植物科、属、种的数目，生活型组成，群落类型和生境类型的多样性均趋于减少，而C3/C4光合功能群比值和群落的物种丰富度，株丛密度，物种多样性，群落均匀度，叶面积指数，叶面积持续时间和群落干物质生产能力均趋于增加，群落生产力动态曲线从随天然降水的季节分布不均而剧烈波动趋向于随气温逐渐升高和热量逐步积累而稳定增长，显示出两站点植物群落从较为旺盛的群体净同化作用、较为稀疏高大的群体结构和少数物种占有较多群落资源的生产力格局向较高的群体密度、优良的多叶性能和多物种资源共享的群落生产力格局转变，反映出在内蒙古草原区不同的自然历史环境背景和不同的温度条件及其水热组合状况影响下，两个不同热量型草原站点植被性质的分异特征和显域地境群落生长模式的较大差别。

The basic information about biological resource of the region should be investigated and its comprehensive ecological development planning should be drawn up.②A tourist service center should be set up in an adequate place.③Guide should be trained and showing system will be provided.④Monitoring system should be set up.⑤Industrial and agricultural production should be strengthened in combination with the construction of ecological tourism.⑥Environment should be virescened and beautified in further.⑦The botanical garden of Magnoliaceae and migration plants from Sanxia area should be made better.

一是要认真开展本底调查和制定生态发展综合规划；二是要在1个适当地方建立1个旅游者服务中心；三是大力培训导游，并编写好各个景区的解说词，把展示系统搞好；四是建立必要的监测系统；五是围绕生态旅游发展的需求，加强工农业生产的建设；六是加强绿化建设，美化环境；七是办好三峡植物迁地保护园和木兰科植物园。

A background survey and a species observation on avian were conducted respectively in the Three Gorges Reservoir during 1996-1997,and 1999-2000.354 species,belonging to 17 orders and 51 families were recorded. Among them,153 (43.22%),164 (46.33%),and 37 (10.45%) species are the avian of Palaearctic region,Oriental region and Cosmopolitan respectively. There are 87 species (24.58%) of summer residents,63 species (17.78%) of winter residents,46 species (12.99%) of travelers and 158 species (44.63%) of residents.

1996～1997年和1999～2000年，分别对三峡库区的鸟类进行了本底调查和物种监测，共纪录到鸟类354种，隶属17目51科，其中古北种153种(43.22％)，东洋种164种(46.33％)，广布种37种(10.45％)；夏候鸟87种(24.58％)，冬候鸟63种(17.78％)，旅鸟46种(12.99％)，留鸟158种(44.63％)；繁殖鸟类245种(69.21％)；国家重点保护鸟类9科42种。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。