Advanced Materials Research Vol. 159

Abstract: In this study, in-depth processing of biologically-pretreated coking wastewater was performed using aluminum sulfate (alum) and alum + PAM, respectively, aiming to study removal efficiency of COD, SS and color of coking wastewater as a function of pH, alum dosage and/or PAM, and to determine the optimal conditions for treatment of the coking wastewater. It was found that the optimum dosage and pH are 300 mg/L and 6.5 for coagulation with alum. The optimal condition for coagulation/flocculation with PAM + alum was 15-minute reaction, pH of 6.5, alum dosage of 220 mg/L, PAM dosage of 6 mg/L. Coagulation using alum and PAM at the optimal condition was more efficient than treatment using single alum for removal of COD and color. Effluent COD after coagulation at the optimum conditions met requirements of the secondary standard described in “Integrated wastewater discharge standard”, while the corresponding color exceeded the limit. Hence, coagulation using alum was found to be inefficient in reduction of color for biologically treated coking wastewater.

Abstract: An integrated technique was investigated, aiming to provide an effective method for the treatment of biologically treated coking wastewater and to reduce pollutants to concentration values below the limits imposed by the legislation. Coking wastewater containing 270 mg/L COD and 202 times color was treated by coagulation using PAC as well as PAC +PAM, respectively. The application of coagulation using PAC+PAM resulted to a much more efficient removal of color, COD and SS in comparison with single coagulation without PAC. The optimal condition for coagulation with PAC was pH 8, dosage 75 mg/L and dynamic condition 1-minute high speed stirring followed by 15-minute low speed stirring. The optimal condition for coagulation with PAC and PAM was: PAM dosage of 6 mg/L, PAC dosage of 70 mg/L, pH of 8 and reaction time of 20 minutes. Both processes of coagulation were found to be efficient for removal of COD from coking wastewater, but ineffective in reducing color.

Abstract: SpaceWire is becoming a popular solution for satellite high-speed data buses, because it is a simple standard that provides great flexibility for a wide range of system requirements. This article introduces the driver design for the SpaceWire communication device based on embedded Linux, including the analysis of the driver structure, the design of the interfaces between the upper and lower layers and the responding strategy for interrupts. In the realization link, we choose a mainstream developing platform and realize a camera capturing system for testing, and analyse the test result.

Abstract: Through theoretical analysis the reasons of generating laser speckle, we use an optical scheme for reducing composite speckle in the three LCOS laser projection system. The project of rotating diffuser has a simple optical structure and can be easily implemented. Finally, experimental verification of rotating diffuser plate can effectively suppress laser speckle contrast.

Abstract: In this paper, we designed a real-time video convert system for the imaging devices which used digital precision progressive scan monochrome camera or the similar camera and as video signal sensor. System hardware circuit design based on LVDS transmission chip, multiformat video decoder chip: ADV718X and the Cyclone II series FPGA. System software design based on hardware description language, verilog HDL and VHDL. The system could real-time capture, process CVBS and output LVDS video data without the system computer.

Abstract: SpaceWire is used for on-board satellite networks. It is proposed by the ESA as the basis for future data-handing architectures. It takes an indispensable role for the shortage of bandwidth of bus among data processing. Based on the research of SpaceWire Network, some parameters, such as delay, bit error ratio, bandwidth and throughput, a new scheme of the testing about the parameters of SpaceWire was proposed. Then its implementation technology was analyzed and explained.

Abstract: CMOS (Complementary Metal Oxide Semiconductor) imagers as a solid state array develop rapidly. This article introduces various types of CMOS image sensors’ noises in detail, the cause of each noise, as well as a brief overview of current methods for reducing different noise.

Abstract: In designing an FPGA based on a 0.5 micron SOI-CMOS technology we experienced a crucial task of providing a robust programmable interconnection network to drive long-line and global signals through the entire chip. The performance and signal integrity of these signals are challenged by the variation in the process as well as the signal driving condition of the individual mapped circuits. In this paper, we focus on the design of an efficient long-line signal interconnect network targeting for high speed and low power consumption of the circuit operation in a tile-based FPGA. The design and verification of the long-line with booster in the channels and the clock network circuitry are described in details. The comparison of the simulation and measured signal timing data is reported.

Abstract: An approach for detecting open and short faults on the interconnect wires of a multi-FPGA system will be presented in this paper. In a multi-FPGA system with N interconnects, this approach can detect whether and where an open fault occurs by executing the IEEE 1149.1 JTAG EXTEST instruction once. To detect a single short fault, on the other hand, needs execution of times where . If multiple short connections exist, this approach will only detect the first short fault. The test time is thus greatly reduced for finding a single short fault per chip. Simulation results demonstrate that this approach can be easily implemented and determines accurate locations of the open/short faults.

Abstract: We consider the video image detector systems using tracking techniques which can be handling of the all kind of problems in the real world, such as shadow, occlusion, and vehicle detection by nighttime. Also we have derived the traffic information, volume count, speed, and occupancy time, under kaleidoscopic environments. In this system we propose a shadow cast algorithm and this system was tested under typical outdoor field environments at a test site. We evaluated the performance of traffic information, volume counts, speed, and occupancy time, with 4 lanes in which 2 lanes are upstream and the rests are downstream. And the performance of our video-based image detector system is qualified by comparing with laser detector installed on testing place.