To meet the demands of different high bandwidth services, we demonstrated a hybrid access network simultaneously transmitting wired and wireless signals. In the downstream, wireless signals are modulated and transmitted in phase modulation format at the optical carrier and wired signals are re-modulated in intensity modulation format, different de-modulation schemes are used at optical network unit (ONU) side; In the upstream, carrier reuse technology are adopted to re-modulate and transmit uplink signals to the optical line terminal (OLT). Simulation results show user ends could get acceptable performance of the wirless and wired signals.
This paper analyzes the changes of water use structure in Shandong Province from 2000 to 2017 in Shandong Province, reveals the driving factors that lead to changes in water use structure. The results show that in the past 20 years, the total water use has firstly increased and then slowly decreased; the agricultural water use has decreased continually; the industrial water has firstly fluctuated and then keeped stable; while the domestic water use and environmental water use has continually increased. The driving factors of water use are agricultural water saving, industrial water saving, population and water consumption per capita growing and landscaping area enlarging.
Contactless magnetic-sensitive two-&mensional angle detector system can be used in harsh environments when longer operating lifetime and better reliability are required. In a single chip wafer, we have designed and fabricated several kind of detect6r systems to find out the better way with the industrial CMOS process. One kind is based on four Hall devices, the other kind is based on lateral magnetotransistor(LM), and' a new system which take both advantage of two above systems..' Through system test, we have found the favorable features of the above systems.
This paper analyzes the trend of runoff and sediment entering the Bohai Sea using the streamflow and sediment data of the Yellow River estuary hydrological station. The results shows that runoff and sediment into sea in the Yellow River both reduce in the recent 60 years, there is significant positive correlation between the two. And the influencing factors of runoff and sediment are also researched, it is found that there is no significant correlation between runoff and precipitation, or between sediment and precipitation. The increase of the water intake quantity from the river is the main reason of runoff reduction entering the sea. And soil and water conservation measures and water storage projects result in the decrease of sediment in the river estuary.
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