Applied Mechanics and Materials Vols. 713-715

Abstract: Two methods of realizing the Quantum Cutting of Sunlight wave by modulating the sunlight-frequency are introduced in this essay. Based on Lu₂O₃, The low-conversion powder composed of Tb³⁺and Yb³⁺is prepared by co-precipitation method; Using NaYF₄ as a foundation, the up-conversion powder containing Er、Yb and Tm is prepared by hot water extraction. Experiments show that, a high-energy photon in the powder of Lu₂O₃,Tb³⁺and Yb³⁺ can be cut into two 974nm near-infrared photons. The co-doped material up-conversion can have a significant effect on the up-conversion when using the 1122nm laser light to irradiate the 0.25cm² experiment silicon photovoltaic cells, and the photocurrent density of battery can be increased to 0.06mA/cm². In this paper, the PTN silicon structure with nanostructural characteristics is designed for a method to increase the photovoltaic effect. The analysis of results indicates that the effects of the external electric field on the photovoltaic voltage and photocurrent are important.

Abstract: This paper discusses that the application of compressive sensing in direction of arrival (DOA) estimation. Traditional DOA estimation algorithms, such as MUSIC, ESPRIT, have shortcomings of high demand of initialization and sufficient number of snapshots and high sensitivity to signal-to-noise ratio (SNR). The proposed DOA estimation algorithm via OMP method based on compressed sensing (CS) can solve the above-mentioned problem and has good estimation performance. Computer simulations verify the effectiveness of the OMP algorithm.

Abstract: In order to solve signal timing optimization problem of the cross intersection with irregular four phases, this paper presents a new method based on the calculation of lane design capacity. There are five steps of the application in this paper: the collection and simple statistics of basic data; the analysis of present situation; the formulation and solution of signal timing optimization model; the evaluation of optimization results which are based on simulation software VISSIM; an actual example was tested to verify the feasibility of the optimization model.

Abstract: s:Hebei’s Coal-fired generating Unit PM_2.5 Emissions on Coal-fired generating Unit were estimation according to the method from “Technical Specifications of power industry and cement sector’s PM_2.5 emissions (consultation)”. Quantitative analysis the relation of boiler tonnage, installed capacity, coal consumption with PM_2.5 emissions.

Abstract: The main concern is over rising temperature during the testing of complex system-on-chip (SOC), this paper studies SOC wrapper and test access mechanism (TAM), and proposes an improved algorithm of TAM assignment under the constraints of temperature. The algorithm uses temperature superposition method and adds compression process. This algorithm can find the test structure that uses shorter test time.

Abstract: A novel greedy algorithm for blind CS recovery without prior knowledge of sparsity, called the Bisection Subspace Pursuit (BiSP) is introduced. The most outstanding feature of the BiSP is that it adopts the bisection method to adaptively estimate the sparsity of target signal, which means that no prior knowledge of sparsity is needed. Simulation results demonstrate that the BiSP not only retains comparable recovery accuracy with CoSaMP, SP and SAMP, but also outperforms the SAMP in terms of complexity when sparsity of signal is large. This makes the BiSP a competitive candidate for many practical situations.

Abstract: It uses STM32F103C8T6 microcontroller as the core processor and AFE4400 integrated analog front-end as the signal conditioning section.OLED12864 displays the measurement results. Dedicated pulse oximeter analog front-end chip simplifies the system and improves the measurement accuracy.

Abstract: With the increasing demand for different applications of antennas, especially multi-band and ultra-wideband antenna, we propose a novel tri-band, ultra-wideband (UWB) antenna with deformed split ring resonator (DSRR). The antenna consists of a partly covered ground plane and a deformed split ring resonator. By integrating the partly covered ground plane and the deformed split ring resonator and optimizing with CST Microwave Studio numerically, the proposed antenna produces three working bands ranging from 2.87GHz to 3.92GHz, 5.08 to 6.30GHz and 7.55 to 9.32GHz, which also satisfy the requirement of UWB. The three working bands cover the WIMAX band in 3.5GHz, the WLAN bands in 5.2/5.8GHz, and X-band, respectively. The radiation pattern is omnidirectional and the direction gain at every frequency is above 3.2 dBi. So the proposed antenna is suitable for multi-band communication applications.

Abstract: In order to realize the wireless communication function of railway locomotives, Cab Integrated Wireless communication equipment (referred to as CIR) as the railway wireless communication system in China's railway locomotives equipment, because has powerful functions, high degree of standardization, and flexible operating characteristics emerged. CRI is based on the GSM-R digital mobile communication technology, GPS global positioning technology, 450MHz and 800MHz analog wireless communications technology such as the development of comprehensive in-vehicle communications equipment. It is the ground of GSM-R equipment and 450MHz, 800MHz and other ground equipment, together form a complete rail integrated wireless communications network.

Abstract: Aim at the high request of symbol synchronization in OFDM systems and the defects of classical methods, an improved method is given, which designs the new structure of training sequence and selects better TDD-offset. Simulation results show that when this method is used, the timing metric curve has only one peak, the symbol synchronization is more accurate.