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A new laser facility with 30kJ/ns/3ω(8 beams) output energy has begun operation with good performance. Another single laser prototype pushes 1ω output energy to 17.5kJ/21ns in 350mm×350mm aperture with four-pass main amplifier architecture.
This paper investigates the joint power and admission control problem for a multi-pair massive multiple-input multiple-output (MIMO) amplify-and-forward relaying system. Our aim is to minimize the total transmit power for users while maximizing the number of supported users by adopting the new linear programming deflation (NLPD) algorithm. Here, the removal strategy of the NLPD algorithm is compared...
In this paper, a set of higher-order hierarchical divergence-conforming vector basis functions based on curved triangular patches is presented for EM scattering analysis of PEC objects above a lossy half space. Numerical examples are presented to demonstrate the valid and efficiency of the proposed approach.
Frogs are capable of multiple locomotion modes including jumping and swimming, which enables them to adapt to various environmental conditions. This paper demonstrates a frog-inspired robot, which can mimic the swimming motion of a natural frog. The robot is developed based on dielectric elastomer actuators, which exhibits muscle-like behavior such as large voltage-induced deformation, high energy...
The SGII-Up laser facility is one of the most important high power laser system in china. The maximum output of one beam is studied, and it is improved to 17600J from initial 5000J.
Soft actuators play an important role in producing motions in soft robots, and dielectric elastomers have shown great promise because of their considerable voltage-induced deformation. In particular, air-filled dielectric elastomer actuators have been well studied, where the air inside provides prestretches to improve the actuation range. This paper proposes a network of inflated dielectric elastomer...
Silicon-based MEMS microthruster matrix has gained great attention as a micro-impulsion system in recent years, especially in application of attitude control of the nanosatellites. Although silicon serves well as the structural material for microthruster matrix in several aspects, its ability to resist ablation is rather weak. In this paper, SiC membrane is introduced to the surface of micro-chambers...
In this paper, we present a theoretical and experimental study about the carrying capacity of flight dielectric elastomer (DE) balloon in electromechanical performance. This paper deals with some structures which are consist of helium balloons or air balloons based on theoretical analysis. We compared the two kinds of gas balloons at the same initial pressure, air and helium, there was no great difference...
In the process of satellite network communication service transmission and distribution, due to the limitation of the system cache space can cause the congestion effect, it easily lose the data of high importance or timeliness. Aiming at the problem of network congestion effect, based on RED (Random Early Detection) algorithm, M_TSPAQM(Queue Manage Algorithm Based on Priority of Multiple Terminal...
In this paper, an efficient numerical technique is presented for analyzing the reflection and transmission characteristics of planar finite frequency selective surfaces (FSS) structures with multilayered dielectric substrate. For ideal infinite size FSS structures, only one single unit cell is of interest with the help of Floquet's theorem and periodic Green's functions. However, for FSS structures...
In this paper, an efficient numerical approach is proposed for analyzing the scattering from PEC objects above a lossy half space over wide angular and frequency band. One of the principal tools for the analysis of scattering from targets located in half-space is the method of moments (MoM) and the half-space multilevel fast multipole algorithm (MLFMA). Since the surface current and the scattered...
In this paper, an efficient three-dimensional (3-D) alternating direction implicit finite-difference time-domain (ADI-FDTD) algorithm has been used to analyze the electromagnetic characteristics of ultra-wideband wireless channel. Conventional FDTD has been successfully used for the electromagnetic analysis of wireless channel. However, there is one of the major limitations of FDTD, which is that...
We present recent advances in writing speed of pSTT_MRAM which demonstrate its potential as a candidate for replacement of LCC cache for advanced technology nodes as well as applications where non-volatility may be needed. In this paper we explore the feasibility of sub-ns switching of devices and their characterization using comprehensive time resolved electrical measurement of the reversal mechanism...
A comprehensive reliability analysis of perpendicular Spin-Transfer-Torque Magnetic Random Access Memory (pSTT-MRAM) is demonstrated that pSTT-MRAM is capable of fast write, more than 107 cycles endurance, less than 10−20 read disturb error rate at 125°C, and 10 years data retention up to 225°C at chip level. Furthermore, we prove for the first time that pSTT-MRAM technology can withstand reflow soldering...
In this paper, a new method is proposed to generate image-assisted geometry simplification for estimating minimum sampling rate of image-based rendering (IBR). If some geometry information (e.g., the shape of object surface and proxy geometry) on a scene is known, we can decompose the scene geometry into a collection of simpler structures on a block-by-block basis. Our framework predicts the characteristics...
An efficient surface integral equation solution is presented to the problem of electromagnetic scattering from chiral material coated conducting object above a lossy half space. By using the surface equivalence principle and the Bohren decomposition scheme, the electric-magnetic current combined-field integral equation (JMCFIE) combined with the combined-field integral equation (CFIE) is developed...
Current understanding of thermal stability of perpendicular STT-MRAM based on device-level data suggests that the thermal stability factor A is almost independent of device diameter above ∼30nm. Here we report that contrary to this conventional wisdom, chip-level data retention exhibits substantial size dependence for diameters between 55 and 100 nm. We show that the method widely used to measure...
The proton exchange membrane fuel cell (PEMFC) is a kind of clean energy, and has a large advantage in the uninterrupted power supply (UPS) which is used in telecommunication base stations. The air-breathing fuel cells stack can simplify the whole system design and development. In this paper, the system configuration is introduced. Two 2.5kw air-breathing PEMFC are adopted to avoid the lower power...
STT-MRAM technology has been attracting renewed attention since the embedability of a working STT-MRAM design has been demonstrated [1]. In this paper we expand on the versatility of STT-MRAM by demonstrating the conversion of a standard STT-MRAM cell to a One Time Programmable (OTP) anti-fuse cell. Both designs are integrated at the Mbit level on a single chip using the same magnetic stack, processing...
Fuel cell is an important distributed generation in micro-grid and the modeling and control for fuel cell power generation systems have attracted the attention of many researchers. Proton exchange membrane fuel cell (PEMFC) modeling for grid-connected is studied in this paper. The simulation model of fuel cell stacks with DC/DC and DC/AC converters is built in Matlab/Simulink. The P/Q Control strategy...
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