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Marine oil spills is a matter of great concern since it causes environmental disasters and threats the ecological system, thus the capability to detect precisely and analyze sufficiently is a significant guarantee to realize the management followed by oil spill. The Synthetic Aperture Radar (SAR) has recognized as a key remote sensing tool for oil spill monitoring and detecting. This paper uses modified...
The Class E dc-dc converter, operating with the switching frequency up to multi-megahertz, is usually regulated by the basic ON-OFF control. In this paper, it is found that in the basic ON-OFF control, the resonant inductor current of the Class E dc-dc converter will be increase with the rise of the input voltage, which will enhance the output capacity of the converter and also increase the ON-OFF...
Taken the high voltage SF6 circuit breaker (HV SF6 CB) as the research object, a novel axial vortex chamber structure with an “X-type” guide blade constructed at the nozzle is proposed to exchange the energy of the turbulent gas flow in the radial direction during the interruption and to control the gas flow temperature gradient. The 3D flow field physical and mathematical model of the arc quenching...
In this paper, the problem of developing a model for signal control system with transit priority using Colored Petri Nets (CPNs) is considered. In a regular four phases signal lights control model, transit detection and two kinds of transit priority strategies are integrated to obtain Colored Petri Nets based transit priority signal control model. The resulting model ensures that transit can pass...
Because of the worldwide aging population, more and more elders suffer from dementia. Nowadays, it is inconvenient and time-consuming for doctors to diagnose whether elders who live independently have dementia because lots of diagnostic questions on a checklist must be asked first, and part of them even require a long-term observation. In order to help doctors and make this diagnostic process easier,...
Based on complex network theory, this paper puts forward a network construction method based on the field visibility of visibility principle, analyzes the inherent properties of electric field, and excavates the important information contained in electric field. By constructing the complex network model through uniform electric field of plate electrodes and slightly non-uniform electric field of high-pressure...
A defected ground structure (DGS) is proposed to in this paper to reduce the mutual coupling between coplanar placed antenna elements. Another arc-shaped DGS under the antenna elements is also studied to reduce the cross-polarization (XP) level, because the DGS for mutual coupling suppression will increase the XP level unnecessarily. Using this method, both the mutual coupling suppression and the...
To satisfy the quality of service requirements of various electricity information interactive applications in power fiber to the home network, we propose a QoS-based optical network unit group planning algorithm. This method uses several ONUs to converge data from all kinds of sensors in a network and then transmit it to OLT through the optical fiber composite low-voltage cable. Process of this method...
With the multi-rate transmission and variable bandwidth switching technology, the Elastic Optical Networks (EONs) have many advantages to satisfy current network traffic. Compared with the traditional optical network, the EONs improve the spectrum utilization and increase the network capacity. So the EONs gradually become the key point of next generation optical transport networks. Obviously, the...
Based on double-fiber-tangent rings we propose a high-reliable wavelength-division-multiplexing optical access network. With the proposed architecture, data convergence can be realized and fiber link can be protected well. Because of fiber failure occurring no matter in primary ring and sub-ring, optical line terminal and remote nodes need to be switched automatically to protection mode. The RN designed...
in this paper, a COB (chip on board) 3wheel test simulation method for assessment banking card bending performance was fully studied and developed. To achieve high precision prediction, the dynamic 3 wheel test is divided into series of static analysis process in which the plastic work can be accumulated. And ANSYS sub-modeling displacement solution is adapt to fine-analysis due to the large dimensional...
Aiming at the increase of carbon dioxide concentration in the atmosphere, the difficulty of carbon sink measurement in farmland ecosystem and the lack of basis of grain carbon subsidy, this paper focuses on the problem that wheat conducts photosynthesis through light radiation to absorb carbon dioxide in the atmosphere and soil. And the wheat's photosynthetic carbon model was constructed using experiment...
The high temperature superconducting (HTS) cable has a wide application prospect in the future power grid because of its low loss, large capacity and friendly environment. Since without AC loss, the HTS DC cable has a longer cooling distance, and is more suitable for large capacity and long distance transmission. In the near future, with large-scale application of renewable energy, HTS DC cable is...
This paper presents the construction goals of smart agriculture according to the requirements of smarter planet and smart agriculture, and designs an overall scheme for smart agriculture based on technologies such as GIS (Geographic Information System), cloud computing, IOT (Internet of Things), big data and sensing technology. The scheme contains five layers: all-sided perception layer, reliable...
A microfluidic gas flowmeter based on optical fiber Fabry-Perot interferometer(FPI) was proposed and demonstrated. The sensor was formed by two embedded optical fibers with a microfluidic gas channel running across the two end faces. The gas flowrate was first tested by monitoring the shift of the resonancewavelength of the FPI. The intensity demodulation method was then applied to investigate thedynamic...
The helical antennas (HAs) work as three different types with respect to various revolution length, which are the normal-direction helical antenna (NHA), the axial-direction helical antenna (AHA) and the conical-direction antenna (CHA). In this letter, the vortical radio waves carrying the multiple orbital angular momentum (OAM) modes generated by the NHAs and CHAs is proposed. The results of the...
This paper presents s new circularly polarized (CP) omnidirectional microstrip antenna array. The designed antenna array has back-to-back structure, four series-fed patch antenna elements on each side. The resonant bandwidth of this array is about 7.4% with center frequency 17.5 GHz. The antenna array has CP gain variation in the main lobe plane is around ±2.5 dBic, axial ratio (AR) in the main lobe...
Plasmonic waveguides exhibit an effective epsilon-near-zero (ENZ) response at their cut-off frequency. In this work, we demonstrate a nanoscale parity-time (PT) symmetric nanophotonic device based on gain medium embedded inside the nanochannel of a plasmonic waveguide. The effect of introducing gain is more than loss compensation and can cause a plethora of new interesting phenomena. In particular,...
The pollution of oil spill troubles people's health unquestionable seriously and restricts the development of coastal economy, severe oil spill will manipulate the ecological environment for quite a long period, and lead to some marine organism extinctions. Introduced an oil spills real-time monitoring system based on ultraviolet fluorescence, which can achieve the function in all weather, real-time...
We propose an index of textural feature for oil spill segmentation based on X-band marine radar image. The radar image used in this paper were acquired on July 21, 2010, from the teaching-training ship, “YUKUN”, of Dalian Maritime University. Using adaptive median filter and Fields-of-Experts model, co-channel interference and small objects are cleaned separately. An index calculated by textural features...
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