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3D metallic printing technology is attempted to implement millimeter-wave (mmWave) antennas. Based on laser beam melting (LBM) technology, the cost and turnaround time of metallic horn antenna fabrication is effectively reduced compared with traditional milling and injection moulding. A conical and a pyramidal horn antenna are printed in 316L stainless steel, both of which demonstrate satisfactory...
This paper studies the fault tolerant control schemes for the active neutral-point-clamping three-level (ANPC-3L) inverters under different fault conditions. The fault conditions include the device-level faults in one inverter leg, the inverter-leg faults, and the open-circuit faults in load. The impacts of faults in devices, inverter leg and load on output voltage levels and mid-point voltages of...
The shift of snow lines and their responding to climate warming change were investigated for the studying area of Nianqingtanglha mountainous in the Tibet plateau based on the yearly minimum snow cover from 2000 to 2008 using MODIS and digital elevation data. The results indicated that the elevations of snow lines were shifting toward higher from 2000 to 2008 following to the ablation of snow cover...
Overview the reason of causing GPS cycle slips and the importance of detecting cycle slips, and summarize the methods which are used to detection, emphatically discuss the thought that use the wavelet analysis to examine the cycle slips. And though practical engineering example, we prove that this method is feasibility and availability.
Albedo is one of the most essential parameters for the radiation energy budget of land surface from analysis of the land-surface process which has influence on the regional climate and even on the global climate. This paper discussed the variation of the albedo from 2000 to 2008 on two administrative areas in China with very different humanistic and natural characteristics, one is Maduo County in...
It is not completely clear that the spatial change of the green house gases such as CO2 concentration, CH4 concentration and their changes with the land ecological variation because there are not enough observational data available. A preliminary result investigating the spatial distributions variation of CO2 and CH4 concentrations in China using observed data by The Greenhouse Gases Observing SATellite...
The positional estimate system which is represented in GPS is applied from the convenience to various fields, and to be used as a navigation system for pedestrians in recent years. However, GPS has a weak point that it is not possible to use in indoors such as underground stations, buildings, etc. This is because GPS needs a radio wave from GPS space satellites. To tackle this subject, a lot of method...
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