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This paper considers interference mitigation with power allocation in cognitive radio systems. In such a system, cognitive radio is designed to transmit data to its corresponding users without causing any interference to the current primary transmission. To avoid these interference between these links, the secondary transmitters sense the primary user's unused eigenvector space and reuse these spatial...
The aircraft separation system is mainly made up of explosive device. In order to improve the reliability assessment for the aircraft separation system, the reliability model was established, and a new method of synthetic reliability assessment for the aircraft separation system was proposed. According to the function characteristics of explosive device, the separation system was divided into three...
For survival analysis, the samples are always tested under various conditions, and the test results are extrapolated from the test conditions to the normal conditions. To assess the survivability as precisely as possible, a method of integrated survival analysis based on location scale model was proposed, using the test data under varied conditions. In this method, the location parameter was assumed...
The majority of wireless power systems transfer power in a directional manner. Recently, 3-dimensional wireless power transfer has been addressed by several research groups. This paper describes a new discrete magnetic field control technique that can ensure omni-directional wireless power transfer in an efficient manner. The proposed control has been successfully implemented. Both theoretical and...
This paper proposes a bendable transformer for wearable electronics. This transformer is bendable to wrap around the forearm. A model using partial equivalent circuit theory (PEEC) is established to analyze the characteristic of the bendable transformer. The bendable transformer is then applied to an LLC DCDC converter. A prototype is built and tested to verify the mode. This LLC resonant converter...
This paper presents a mathematical analysis on 2-dimensional omni-directional wireless power transfer. It is shown that with the use of current control in the transmitter coils, magnetic field vector can be generated to point at all directions in a 2-dimensional sense. The theory allows the equations of the total input power and output power of the system to be determined at all angles of input magnetic...
A tractor beam is a propagation invariant beam that pulls objects towards a light source. Here, an efficient tractor beam with improved stability is generated by illuminating a dielectric metasurface with a Gaussian beam.
A novel tunable optoelectronic oscillator utilizing an optical notch filter based on stimulated Brillouin scattering is demonstrated. Tunable 3.36 to 31.4 GHz signals with phase noise of −120 dBc/Hz at 10 kHz offset are obtained.
Hyperbolic meta-materials based on ultrathin metal-dielectric multilayers have been studied by considering the nonlocal response of electrons in metal. We show that nonlocality will induce topological transitions of the iso-frequency surfaces and limit light-matter interactions.
A structure providing broadband asymmetric light transmission at 1.5 μm with a suppression ratio of 24:1 is achieved with a metasurface consisting of three cascaded layers of gold nano-wires, with a total thickness of λ/5.
The effect of applied electric field on neuroprotection and axonal regeneration has been studied in previous studies of acute spinal cord injury (SCI). However, due to the complexity of the microenvironment of the lesion site, the underlying mechanism of applied electric field is not yet fully understood. Thus, the injury potential, a significant index of the microenvironment change, was investigated...
Generation of terahertz (THz) radiation was observed in epitaxial VO2 films grown on R- and C-cut sapphire substrates above and below the metal-insulator phase transition temperature. Polarization analysis of the emitted THz radiation reveals strong in-plane anisotropy of the conductive phase of VO2 which is not observed for insulating phase, generation efficiency increases up to 30 times after phase...
Effective repair immediately after spinal cord injury can improve the prognosis of the patient. Injection of membrane resealing nanomaterial is one of the most promising technique to repair the membrane. In order to improve the retention rate of membrane repair material at injury site, membrane resealing nanomaterial can be combined with magnetic nanoparticle and magnetic targeting system. In this...
Objectives: We explored whether oscillating field stimulation (OFS) could efficiently promote motor function recovery in rat model of spinal cord injury.
In this paper, we present a novel robotic fish capable of maneuverability and yet with less joints. The maneuverability of the robotic fish is researched on two aspects: straight swimming and performing a turn before which, the mechanical structure, dynamic formula and posture of robotic fish are respectively designed and analyzed. Besides, the CPG-based control and the analysis of variation regulation...
Solder pastes are widely used as a principal bonding medium in the electronics industry. Many paste parameters, such as paste composition, printing stencil aperture and reflowing profile, influence the printing performance and the reflow process of solder pastes. In this paper, experiments are conducted to investigate the effect of filmogens and solvents on slump-in-heating resistance of Sn-3Ag-0...
Network traffic load usually differs significantly at different times of a day due to users' different time preference. Network congestion may happen in traffic peak times. In order to prevent this from happening, network service providers (NSPs) can either over-provision capacity for demand at peak times of the day, or use dynamic time-dependent pricing (TDP) scheme to reduce the demand at traffic...
Recently, there has been an ever-increasing interest in the study of data-driven analytics to predict hidden dangers in the cloud service-based coal mine production, with the purpose of the prevention of possible accidents. In this paper, to achieve the above prediction, a machine learning algorithm based on the single-hidden layer feed forward network (SLFN) using timeliness managing extreme learning...
A transparent and stretchable zeroth-order resonant (ZOR) antenna is presented. In order to realize the proposed antenna, the CPW-fed ZOR antenna is utilized. A vertically oriented meander line scheme is employed to obtain high reconfigurability. By changing the strain, the resonant frequency of the antenna is tuned from 2.94 GHz to 2.46GHz. Due to the use of stretchable micromesh, the antenna can...
Sea surface salinity as an ocean variable plays an important role in various components of the water and energy cycle. Recently a Chinese space mission using a new concept of Microwave Imager Combined Active and Passive (MICAP) at L-band is proposed for the ocean salinity measurement. MICAP uses interferometric techniques for both the radiometer and the scatterometer, which adopt two kinds of linear...
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