Wind pollination in Pinus roxburghii
Vinod Prasad Khandur, Chandra Mohan Sharma · Progress in Natural Science Materials International · 2006
Abstract A design of a quadrature-data acquisition based on peripheral component interconnect(PCI) bus for mini-type magnetic resonance imaging (MRI) system is reported. It uses two high speed analog-to-digital converters (ADCs) to sample the MRI signals and two static random access memories (SRAMs) to store the data which will be read to the computer by PCI bus after sampling. All the logic control signals on the card are generated by the field programmable gate array(FPGA). The software Foundation 3.1 is used to design the FPGA and achieve useful result after simulating and implementing. The card has some memories that normal commercial cards do not have. For example, the sampling parameters can be varied according to different pulse sequences. Supported by National Science Foundation of China (Grant No. 19675005)