<正>A total of 1400 soil samples from the plow layer (0-20 cm) at an approximate interval of 5 km were collected in the autumn of 2002 over the entire black soi
研究了采用双基线GPS多天线配置方案测量载体的姿态 ,通过改进的GPS多天线配置法完成对整周模糊度的解算 ,结合GPS载波相位信息测量得到基线矢量。该姿态测量方案能快速而准确地解算整周模糊度 ,解算方法算法简捷、计算速度快 ,并且不依赖GPS的码元信息 ,减小了跳周现象对测量结果的不利影响 ,使姿态测量精度得到提高 ,对于实时姿态测量 (RAD)系统具有很好的应用价值。
<正>Nitrogen(N)supply is the most important factor affecting yield and quality of flue-cured tobacco(FCT).A field experiment and an in situ incubation method we
<正>A series of experiments were conducted to examine the interactive effects of an organic ligand,a competing cation, and pH on the dissolution of zinc (Zn) fr
Pedogenetic soil horizons are one of the fundamental building blocks of modern soil classification;however,in soils of urban areas which are often strongly dist
利用雷达技术可以测量目标回波的多普勒频率和相位差,而多普勒频率中含有距离和速度信息,利用这一技术设计了空空导弹矢量脱靶量测量系统.
<正>For the past 20 years, numerous studies have been carried out on the application of equilibrium partitioning approach (EqPA) for the derivation of sediment
During the past century,natural and human modifications of environmental systems have greatly accelerated coastal salt marsh deterioration and shoreline retreat
One of the most important functions of soils is to regulate rainwater and mitigate flooding and associated damages; this function can be estimated by the rainwa
Concentrations of copper (Cu) and zinc (Zn) and various magnetic parameters in contaminated urban roadside soils were investigated using chemical analysis and m