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The work function and surface energy of aluminum with different orientations are investigated by employing the DFT simulation. We mainly focus on two situations: pure aluminum surface and aluminum surface with impurities. The numerical results indicate that the work function of Al (100) is larger than Al (110). With the introduction of the impurities (carbon atoms), the work function increases because...
This paper mainly focuses on the specific absorption rate (SAR) of the dual-element LTE MIMO antenna in mobile phones. Four designs of dual-element MIMO antenna (namely, dual semi-ground-free planar inverted-F antenna (PIFA), co-located antenna, dual OG PIFA in parallel position, and dual OG PIFA in orthogonal position) are studied under four typical LTE frequency points (0.75, 0.85, 1.9, and 2.1/2...
A new approach based on the modified particle swarm optimization (PSO) algorithm is presented for the protection capacity optimization problem. The modified PSO algorithm combines the elitist strategy and mutation operation of the genetic algorithm (GA) which avoids premature convergence of standard PSO algorithm. The efficiency of the new method is higher than the GA owning to its simpler structure,...
The standard active element pattern (AEP) method is presented to predict the radiation pattern of large finite arrays. In this method, the AEPs of a large array are deduced from those of a small subarray. Thus, it needs to compute the AEPs of the subarray element-by-element and costs much CPU time. Also, this paper proposes a simplified AEP (SAEP) method to eliminate this complicated procedure. In...
We present a novel wireless data acquisition system for Euro-balise. In order to reduce channel noise and power consumption, a novel all-digital frequency shift keying (FSK) demodulation method based on the use of multi-bit XOR gates and a mean value filter is proposed. The demodulator implemented in 65nm CMOS process can demodulate the FSK signal of passive railway Euro-balise in practical test....
Since the exchange rate reform of China, except for a short-term price fall, the real estate price rose rapidly and reached a record height. This paper chose the monthy data of exchange rate and real estate price from July 2005 to December 2012, and conducts an empirical analysis on the correlation effect of the exchange rate and real estate price by using economic theory, combined with the econometric...
An interactive whiteboard is a large interactive display that connects to a computer and projector. A projector projects the computer's desktop onto the board's surface where users control the computer using a pen, finger, stylus, or other device. The board is typically mounted to a wall or floor stand. The majority of IWBs sold globally involve one of four forms of interaction between the user and...
Unknown word recognition is one of the most prominent and challenging problems in the Chinese language processing. Some effective approaches have been proposed, however, they do not work well on Chinese twitter (i.e. weibo) messages. In this paper, a method is presented to recognize unknown words from weibo. Due to the great flexibility in wording and highly correlation between unknown words and unpredictable...
Many researches use crop models to simulate the impact of climate change to rice production. However crop models were developed for specific location and varieties. The uncertainties of simulation and prediction in rice production were not fully investigated at a large scale in major rice production regions of China. This study calibrated and validated SIMRIW model in the major rice production regions...
Wave buoy has been more widely applied in the ocean measuring field, and the bidirectional communication between the wave buoy and the data center has become a hot area of research. The communication system transmits signal securely and effectively to the upper computer system for our references, and concurrently, accurately executes commands from upper computer system on lower computer system. Based...
A - mutual scattering mode -is introduced in this paper as a novel method to reduce the correlation for the LTE MIMO antenna arrays. This mode is mainly based on the increase of the Q factor for the closely-positioned MIMO antenna elements. With the increased Q factor, each element becomes a scatter for the other elements. Consequently, without adding any structure in the MIMO system, the radiation...
A new kind of chassis mode, namely, Diagonal Chassis Mode, is introduced in this paper. It can be easily excited for PIFAs by selecting a proper shorting point on the ground plane. Through this mode the correlation coefficient between MIMO PIFAs operating at LTE 700 MHz bands can be reduced effectively with the improvement of total efficiency and impedance bandwidth.
Most existing cancelable biometrie frameworks are based on one-dimensional (ID) vectors rather than two-dimensional (2D) images or feature matrices. 2D cancelable biometrics, generated directly from images of feature matrices, were proposed based on two-directional two-dimensional fusion sparse random projection ((2D)2FSRP) and two-directional two-dimensional plus sparse random projection ((2D)2PSRP),...
This paper reports a study of specific absorption rate (SAR) for LTE MIMO antennas in mobile phones, with special consideration to the effects of different chassis lengths and different types of MIMO antennas. Two designs of dual elements MIMO antenna are studied under two typical LTE and mobile phone frequency points. The simulations are carried out both for a specific anthropomorphic mannequin (SAM)...
EIT image reconstruction requires an accurate inverse model to get the conductivity of distribution within the domain, which is often computed expensively, especially in three dimensional applications. Large linear systems should be inverted in calculation. In the paper a Node Jacobian Back-Project Algorithm is presented. We use a node Jacobian-based method scaling with the number of nodes in our...
In this paper, we built two EIT models to compare for the modeling errors caused by breathing of the body shape. An efficient nodal based calculation mehtod of Jacobain Matrix considering both the change of resistivity and electrode placement is outlined and presented. We evaluate the approach with both a simulated example of boundary voltage and real measurement data for thorax imaging. The results...
Precipitation is an important part of hydrologic cycle in global scale or regional scale. Although satellite-based observation is able to provide spatial and temporal distribution of precipitation, the satellite measurements tend to show systematic bias. A fusion method for mapping precipitation is introduced in this paper. The thin plate smoothing spline interpolation method is introduced to combine...
Parallel algorithms can significantly improve the efficiency of rasterization. This paper implements a parallel algorithm for rasterization that is proposed for the fast processing of enormous amounts of vector data based on message passing interface (MPI) library. Results show that the new parallel algorithm can improve the efficiency of rasterization processing.
Vector to raster conversion has always been one of the foundational research topics in the field of Geographical Information System. With the development of processing for massive geospatial data, traditional serial algorithms can not satisfy the need of effective rasterizing of large amounts of vector data. This paper proposes a parallel algorithm of rasterization for vector polygon based on data...
Geospatial data sharing is an increasingly important subject as large amount of spatial data is produced by a variety of sources, stored in incompatible formats, and accessed by different GIS application. Due to the limitations of the techniques, funds, as well as policies, many scholars have been focusing on the design and implementation of the common interface, which is more and more popularly accepted...
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