Advanced Materials Research Vols. 433-440

Abstract: For the existing drawbacks in the crucible rotation vertical drop method, the control system is improved. Developed a new control system, overcome the drawbacks of original crystal growth control system, and improve the control precision, and simplify the programming program. Use to prove it reliable, stable, a more perfect crystal growth control system. Now has been formally put into use.

Abstract: Low power and portable systems working at high frequency are becoming a significant force in the communication industry. SAW filters have been used in wireless communication systems since the early days of mobile phones. But applications at the higher handset frequencies run up against the capability of conventional SAW structures. Bulk Acoustic Wave (BAW) Technology, a relatively recent addition to this portfolio follows MEMS principle to design high performance microwave components for RF communication. Simulation of the Bulk Acoustic Resonator using Butterworth Van Dyke Model (BVD) Model and design of Ladder Filter with the designed resonator in the RF design platform Agilent ADS (Advanced Design System) have been presented. The simulated results confirm the tuning of operating frequency of designed BAW device at 2.4 GHz.

Abstract: In this paper, we propose a novel scheme combing opportunistic schedule (OS) and transmit antenna selection (Tx-AnSS) with ZF receivers under imperfect channel estimation in SM-MIMO systems, where the user set and the transmit antenna subset are adaptively selected according to channel state information (CSI), which is feedback from the receive side. First, we derive the average effective SNR and both analytical forms and approximation expressions for outage probability and BER expression, showing that combining multiuser diversity (MUD) and Tx-AnSS in SM-MIMO systems provides much larger diversity and better performance than the scheme without MUD or Tx-AnSS. Further, the diversity gains for both outage probability and BER expression are also quantified through asymptotic analysis.

Abstract: The research on establishing an automated data acquisition system with high speed and accuracy is a hot topic in measurement and testing area. The desire is extremely high in data acquisition systems with high speed, multi-channels and large capacity, therefore research into this field becomes very important and significant. In this paper, a LXI high speed parallel data acquisition system which is combined LXI bus with high-speed data acquisition ability is proposed. And the signal conditioning circuit, ADC, data storage circuit, FPGA main control circuit and LXI interface circuit are introduced in detail. The remote control of the data acquisition system and the high speed transmission of data are realized by using the LXI bus.

Abstract: Paper has been removed due to suspected plagiarism.

Abstract: Java3D API is an interface to implement 3D display, Java3D encapsulated the underlying technologies such as OpenGL and DirectX into Java interfaces, and solved the problem of 3D visualization in the network cross-platform environment with the strong network function of Java language. Therefore, the research on Java3D technology for web page virtualization becomes necessary. This paper summarized the key Java3D technology for web page virtualization, researched its implementation method and model-constructing process, and discussed the application of some technologies in practice.

Abstract: The chaos sequence generated by the chaotic map methods usually has unsatisfactory performances. To solve this problem, this paper proposes a novel method with chaos sequence, which blends the Chebyshev chaotic map and one-dimensional chaotic map with infinite collapse in finite interval. Both MATLAB simulations and performance analyses results show that the proposed method has much improved chaotic performances than the single Chebyshev sequence or the chaotic sequence with infinite collapses, by analyzing and simulating the sequence of traversal feature, period doubling properties, Lyapunov exponents, initial value sensitivity, autocorrelation, and the uniformity of sequence.