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With the rapid development of the Beidou system, it is important to research the acquisition of B1I signal. In order to acquire the MEO/IGSO satellites signal modulated with 1 kbps NH code in interference environment effectively and quickly, a signal acquisition scheme which is the combination of an improved half bits differential acquisition method and 3-points conic fitting method to get fine frequency...
This paper discusses the fractal feature of pore structure based on the capillary pressure data of mercury withdrawal and mercury injection. Also, the paper calculates the fractal dimension of pore structure of He8 zone in Sulige gas field. The study results show that fractal feature of mercury injection capillary pressure curve has a property of two-stage with an obvious bend, which shows the double-porosity...
Nickel (Ni) plays an important role in the growth of plants, but it is also a kind of heavy metal which can easily enrich in soil and exert toxic effect on plants. To evaluate the Ni stress on the maize growth, a pot experiment was conducted by black soils sampled from the field in the middle of Jilin province. And Ni was equilibrated in the soils to graded levels from 0 to 800mg kg-1 soil. The main...
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