In order to meet the requirements of Location-based Service (LBS), there are many proposed positioning solutions that may be able to provide LBS support, such as GPS, Mobile Phone Location, RFID, and so on. With the m...
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ISBN:
(纸本)9780819480798
In order to meet the requirements of Location-based Service (LBS), there are many proposed positioning solutions that may be able to provide LBS support, such as GPS, Mobile Phone Location, RFID, and so on. With the most widely recognized system being the Global Positioning System (GPS) and Windows Mobile 5.0 system characteristics, this paper first provides three kinds method, i.e. invoking Win32 API, using Ports namespace and calling GPS Intermediate Driver, to receive GPS raw data on Windows Mobile devices. Since internet-based GPS VRS RTK workstation can provide real-time streaming of differential GPS corrections. The following text introduces a high precision Net-based RTK (NRTK) mobile positioning solution which is mainly equipped with a Windows Mobile 5.0 device and an Ashtech Z-Xtreme receiver. With it a rover-side (NtripClient) firstly connects to an NtripCaster which is a part of a VRS workstation, via GPRS / CDMA, using the IP and specified listening Port of the Tongji VRS workstation. Then the rover-side transmits NMEA GGA strings after the HTTP request to the NtripCaster. With that the Windows Mobile device continuously receives RTCM data back from the NtripCaster and instantly sends them out into the Ashtech Z-Xtreme receiver. Finally, the Ashtech Z-Xtreme receiver will work out vector solution information of the rover-side. Thus, this paper provides a multimode mobile LBS positioning solution based on NRTK and Windows Mobile 5.0.
Ruthenium catalysts were prepared by impregnation of different supports: ZrO(2), CeO(2), TiO(2), ZrO(2)-CeO(2) and TiO(2)-CeO(2). Their activities for acetic acid oxidation in aqueous solution were investigated in a s...
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Ruthenium catalysts were prepared by impregnation of different supports: ZrO(2), CeO(2), TiO(2), ZrO(2)-CeO(2) and TiO(2)-CeO(2). Their activities for acetic acid oxidation in aqueous solution were investigated in a stirred reactor at a reaction temperature of 200 degrees C and total pressure of 4 MPa. The order of the catalyst activity obtained was RuO(2)/ZrO(2)-CeO(2) > RuO(2)/CeO(2) > RuO(2)/TiO(2)-CeO(2) > RuO(2)/ZrO(2) > RuO(2)/TiO(2), which corresponds to surface concentration of non-lattice oxygen (defect-oxide or hydroxyl-like group) of these catalysts. The non-lattice oxygen on the catalyst surface plays an important role in the catalytic activity. (C) 2008 Elsevier B.V. All rights reserved.
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