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Corn is one of the most essential economic crops globally and is an important part of China's agricultural industry. Corn growth monitoring is helpful for agricultural land reallocation and production evaluation. The compact polarimetric (CP) SAR could be a good tool for large area surveillance as it overcomes the width limitation of fully-polarimetric (FP) SAR, whereas still inherits abundant information...
The heading error with the traditional inertial navigation system (INS) modeling is proportional to both linear movement errors and tangent function of latitude. As a result, due to the poor observability of the heading misalignment angle, the performance of initial alignment with the traditional alignment model would be influenced in non-equatorial regions, thereby leading to the filter's divergence...
In this paper, the accurate model is built to calculate the permittivity of sea water at different sea areas with foams. The relationships between the foam coverage and air-sea temperature and wind speed are analyzed. Then based on the facet-model theory, the modified two-scale model (MTS M) and Vector Radiative Transfer (VRT) theory, the modified facet-based two-scale model (MFBTSM) with foams is...
In this paper, a new design of planar circularly-polarized (CP) filtering antenna using substrate integrated waveguide (SIW) cavities is presented. The design is based on the dual-mode cavity structure using TE120 and TE210 modes. The satisfying filtering performance of the antenna is realized by a coupled-resonator circuit of the two SIW cavities. And the radiating element is a non-uniform ring slot...
In this paper, a design of compact ultra-wideband (UWB) bandpass filter with a ultra-narrow notched band is presented. The UWB frequency responses are achieved by using a microstrip-CPW broadside coupling structure. And a pair of side-coupled short-circuited microstrip lines is introduced to generate an ultra-narrow notched band. Based on this design, by loading a pair of varactor diodes at the end...
The bistatic specular scattering from ocean surface plays a major role in the coupling fields between super-low altitude target and ocean surface. Using the Brewster effect of ocean surface can weaken specular scattering effectively. Based on the satellite data of ocean salinity and temperature at the Western Pacific and Southeast coast, dual-Debye function is applied to build the modified model of...
High performance chip design is always a hot topic in integrated circuit (IC) field. Clock design plays a critical role in improving chip performance and affecting power consumption. The regular clock layout has always been the ideal way to improve the timing of results. In this paper, we propose a symmetrical clock tree synthesis algorithm for top-level design, including tree architecture planning,...
Air conditioning loads have the potential to participate in frequency response when the power shortage accident occurs. In this paper, a decentralized frequency response control strategy is proposed to take advantage of the potential of air condition loads. Firstly, we analyze the existing decentralized control strategy, which adjusts the setting temperature of air conditioners according to the frequency...
Secure interoperation is an important technology to protect shared data in multi-domain environments. IRBAC (Interoperable Role-based Access Control) 2000 model has been proposed to achieve security interoperation between two or more RBAC administrative domains. Static Separation of Duties (SSoD) is an important security policy in RBAC, but it has not been enforced in the IRBAC 2000 model. As a result,...
with the help of the base installations of network services, mobile networks and pervasive computing, numerous real-time data information of external environment is available from the Internet and is valuable for autonomous vehicles to improve decision-making. Accordingly, in this paper, an approach is provided to collect useful data from the Internet and discover knowledge from these data. The paper...
An autopilot system includes several modules, and the software architecture has a variety of programs. As we all know, it is necessary that there exists one brand with a compatible sensor system till now, owing to complexity and variety of sensors before. In this paper, we apply (Robot Operating System) ROS-based distributed architecture. Deep learning methods also adopted by perception modules. Experimental...
Linking the terrestrial water cycles, carbon cycles and energy exchange, evapotranspiration (ET), which combines the surface evaporation and plant transpiration, is a key land surface parameter in water and heat balance of land, lake or river surface, and is central to earth system science. In this study, based on the MERRA reanalysis dataset and MODIS NDVI and LAI product, a support vector machine...
Change detection is a hot issue and is of great significance in remote sensing. The logarithm operation is a valid way to reduce the influence of multiplicative noise in the Synthetic Aperture Radar (SAR) image. However, changed areas with high gray level values will be weakened due to the nature of the logarithmic function. In this paper, a SAR image change detection framework based on visual attention...
A master oscillator power amplifier (MOPA) configuration ytterbium-doped pulsed fiber laser (YDPFL) with directly modulated seed has been demonstrated and 160 W output power is obtained for the laser with adjustable pulse durations in ns range. This laser can be used for many industrial applications.
VO2 (A) emitters with 10 nm gap between the cathode and anode were fabricated with the aid of focus ion beam etching. Excellent field emission properties were achieved under atmospheric conditions with turn-on voltage as low as 0.6 V and good emission stability over 30 minutes. This work provides a practical way to eliminate the vacuum needs of the field emission devices and has potential use in future...
Insomnia can significantly affect students learning performance in school. Researchers have indicated the importance and challenge of coping with insomnia using non-drug treatment, such as the cognitive behavioral therapy for insomnia (CBT-I). Self-regulated learning strategies are known to be an effective approach for helping people improve their time management as well as their ability to set learning...
Ultrafast fiber lasers have been recognized as the efficient ultrashort pulse sources, which can be applied to various practical fields, such as material processing, fiber sensing, optical communication and medicine. To generate ultrashort pulse, the most efficient approach is the use of passive mode-locking techniques. So far, the passively mode-locked pulse duration ranging from femtosecond to picosecond...
The distribution of fresh agricultural products in our country is restricted by the ability of distribution, which causes too many intermediate links in the supply chain, so that the income of both ends in the supply chain (the suppliers of agricultural products and the final consumers) are seriously damaged. In this paper, with the help of matrix model analysis, we design a differentiated distribution...
The Ron sp of a DMOS operated at high side (Ron_sp_HS) in the power management ICs is usually underestimated by taking the measured value at low side operation (Ron_sp_LS). The Ron_sp_HS is increased drastically when a revise voltage is applied between drift region and substrate because the drift-region is depleted and the current path is narrowed. In this paper, a novel structure with a varying-junction-depth...
Field emission properties of SiC emitters with 14 nm gap between the cathode and anode are investigated here. With this nano gap, field emission can be turned on at 3V, which is much lower than that in previous works and comparable to that of CNT emitters. Its emission current follows the Fowler-Nordheim relationship and reaches up to 22.3nA at 5V. The influence of emitter width on field emission...
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