The reliability of global navigation satellite system(GNSS)positioning degrades when satellite signals are interfered.Such degradation is hard to be deteced by a micro-electro mechanical system(MEMS)based inertial sys...The reliability of global navigation satellite system(GNSS)positioning degrades when satellite signals are interfered.Such degradation is hard to be deteced by a micro-electro mechanical system(MEMS)based inertial system(INS)/GNSS,integrating navigation system with a conventional Kalman filtering,which results in potential integrity problem of the system.Hence,an algorithm combining wireless fidelity(WiFi)signal with a federated Kalman filter(FKF)is proposed to identify the system integrity in dense urban navigation.The criterion of the system integrity detection is created followed by the derivation of the integrity coefficient.The field test shows that integrity changes can be captured by applying WiFi,and the maximum positioning error is reduced by 67% without compensation of inertial sensors in integrity deterioration.展开更多
Plants constantly survey the surrounding environment using several sets of photoreceptors. They can sense changes in the quantity （= intensity） and quality （=wavelength） of light and use this information to adjust...Plants constantly survey the surrounding environment using several sets of photoreceptors. They can sense changes in the quantity （= intensity） and quality （=wavelength） of light and use this information to adjust their physiological responses, growth, and developmental patterns. In addition to the classical photoreceptors, such as phytochromes, crypto- chromes, and phototropins, ZEITLUPE （ZTL）, FLAVIN-BINDING, KELCH REPEAT, F-BOX 1 （FKF1）, and LOV KELCH PROTEIN 2 （LKP2） proteins have been recently identified as blue-light photoreceptors that are important for regulation of the circadian clock and photoperiodic flowering. The ZTL/FKF1/LKP2 protein family possesses a unique combination of domains： a blue-light-absorb- ing LOV （Light, Oxygen, or Voltage） domain along with domains involved in protein degradation. Here, we summarize recent advances in our understanding of the function of the Arabidopsis ZTL/FKF1/LKP2 proteins. We summarize the distinct pho- tochemical properties of their LOV domains and discuss the molecular mechanisms by which the ZTL/FKF1/LKP2 proteins reg- ulate the circadian clock and photoperiodic flowering by controlling blue-light-dependent protein degradation.展开更多
基金Supported by the National Natural Science Foundation of China(61173076)
文摘The reliability of global navigation satellite system(GNSS)positioning degrades when satellite signals are interfered.Such degradation is hard to be deteced by a micro-electro mechanical system(MEMS)based inertial system(INS)/GNSS,integrating navigation system with a conventional Kalman filtering,which results in potential integrity problem of the system.Hence,an algorithm combining wireless fidelity(WiFi)signal with a federated Kalman filter(FKF)is proposed to identify the system integrity in dense urban navigation.The criterion of the system integrity detection is created followed by the derivation of the integrity coefficient.The field test shows that integrity changes can be captured by applying WiFi,and the maximum positioning error is reduced by 67% without compensation of inertial sensors in integrity deterioration.
文摘Plants constantly survey the surrounding environment using several sets of photoreceptors. They can sense changes in the quantity （= intensity） and quality （=wavelength） of light and use this information to adjust their physiological responses, growth, and developmental patterns. In addition to the classical photoreceptors, such as phytochromes, crypto- chromes, and phototropins, ZEITLUPE （ZTL）, FLAVIN-BINDING, KELCH REPEAT, F-BOX 1 （FKF1）, and LOV KELCH PROTEIN 2 （LKP2） proteins have been recently identified as blue-light photoreceptors that are important for regulation of the circadian clock and photoperiodic flowering. The ZTL/FKF1/LKP2 protein family possesses a unique combination of domains： a blue-light-absorb- ing LOV （Light, Oxygen, or Voltage） domain along with domains involved in protein degradation. Here, we summarize recent advances in our understanding of the function of the Arabidopsis ZTL/FKF1/LKP2 proteins. We summarize the distinct pho- tochemical properties of their LOV domains and discuss the molecular mechanisms by which the ZTL/FKF1/LKP2 proteins reg- ulate the circadian clock and photoperiodic flowering by controlling blue-light-dependent protein degradation.
