Advanced Materials Research Vols. 605-607

Abstract: In this paper, we discussed a method of dynamic detection for clutch of real vehicle based on RFID technology. Clutch is a key component in vehicle. It ensures smooth start and shift and prevents overload of transmission system. Traditional detection method is to measure on a simulated working table. But the combining process of start and shift in bad condition can bring other troubles which lead to possible damage and reduce the service life of clutch. So, it is very important to detect Clutch of real vehicle in real time. Firstly, we discussed clutch of real vehicle important parameter. Secondly, a wireless transmission method is provided by RFID. Finally, a simulation results is given.

Abstract: For measure parameters of aerocraft Attitude, this paper puts forward the BP ANN model based on the information integration theory, the problem of lower angular speed accuracy and bigger navigation error are solved. Through researching the aerocraft attitude affection based on the output of the gyro/geomagnetic sensor，the network model are set up. The gyro/terrestrial magnetic sensor output signal is used as input, and real-time three axis angular speed as output. After trained for the test samples, we got the higher precision of angular speed, then calculated attitude angle applied the approximation formula method, reduced systematic errors. After lots of experiments on the no magnetic turntable, the result shows that the method has the characteristics of fast convergence and better angular speed accuracy.

Abstract: The measurement of pipeline to ground potential is the most common method to evaluate protection condition of buried pipeline. For the old pipeline, pipeline to ground potential measured with surface reference electrode method or reference electrode method close to pipeline usually is not the real protection potential of buried pipeline due to presence of an IR drop and/or stray current interference. A portable real protection potential measurement system combining the polarized probe with the portable surface data acquisition unit is developed, the polarized probe can measure the real protection potential by eliminating IR drop and/or stray current interference, meanwhile portable surface data acquisition unit can automatically record protection potential. The on-site application of the system show that the system can quickly and accurately measure the protective potential of buried pipeline, reduce human measurement error, and really reflect the cathodic protection condition of pipeline.

Abstract: In this paper, we present a simulator based on NS2 for Underwater Acoustic Sensor Networks (UASNs), named Aqua-Sim, which simulates the attenuation of underwater acoustic channels and the collision behaviors effectively. In addition, Aqua-Sim supports 3D network deployment and provides some MAC and routing protocols. Through communication between two nodes and localization of unknown nodes, the application examples of Aqua-Sim are shown. We also present the graphical user interface of Aqua-3D using an example application.

Abstract: Node deployment is a reflection of cost and performance in Underwater Acoustic Sensor Networks (UASNs). In this paper, we compared three different node deployment strategies, namely random deployment, grid deployment and tetrahedral deployment, on aspects of node number, end-to-end delay, localization accuracy, coverage and connectivity. Simulation shows that tetrahedral deployment strategy has the smallest localization error. As connectivity is to be ensured, coverage can be reduced depending on the ratio of r/s.

Abstract: A self-calibration algorithm is described that allows the separation of the flatness error of two-dimensional profiling stages through the combination with a flat artifact whose accuracy is unknown. The calibration requires performing three independent measurements with different orientations of the same artifact to make mathematical models. Then the self-calibration algorithm was simulated using Matlab. The simulation results show that when there is no random measurement noise, this algorithm can realize exact calibration of the flatness error of the stage, while in the presence of random measurement noise, the algorithm introduces a calibration error of about the same size as the random measurement noise itself.

Abstract: Abstract. To determine the residual organic solvents(methanol, dichloromethane, normal hexane ) in antitumor crude drug di-phenyl-di-(2,4-dichlorobenzohydroxamato)tin(DPDCT), capillary gas chromatography (GC) method was established. The HP-5 (30m×320μm×0.25μm) capillary column and flame ionization detector (FID) detector were adopted. The carrier gas was nitrogen with flow rate 5.08 ml·min-1. The column temperature was 50.0°C and column pressure was 20.00psi. The distributary ratio was 20:1. 1, 2-dichloroethane was used as the internal standard substance while toluene as the solvent to determine the residual organic solvents. The calibration curves for methanol, dichloromethane and normal hexane are linear in the rang of 180.6～481.5μg·ml-1(r2 = 0.9974), 35.78～95.40μg·ml-1(r2 = 0.9950), 17.82～47.52μg·ml-1(r2 = 0.9995), respectively. The average recoveries of methanol, dichloromethane and normal hexane are 100.4 %( RSD=1.8%), 100.3 %( RSD=1.7%), 99.6 %( RSD=1.5%), respectively. The method is a simple and accurate method with high sensitivity and repeatability. It is suitable for the residual solvent determination of antitumor DPDCT.

Abstract: Communications equipments' voltage, current fluctuations and power changes will bring uncertain hazards in communication systems, monitoring each functional unit's power is necessary. However, communication equipment's power supply has characteristics such as high transient and wide-scale fluctuations, which increases the difficulty of monitoring the power output. This paper introduces a design of an accurate real-time detection of each functional unit's power in communications equipment. The design uses dedicated power detection chip LTC4151 as the core components of the power collection, the LTC4151 which has wide range and high DC voltage input can measure output power, determine and make alarm processing under the management of the micro-controller. The hardware and software design of system are described in detail. The design has high reliability which solved the problem of monitoring communication equipment's power under the complex environment with simple circuit.

Abstract: The paper concerns algorithms error and parameters correction technology of frequency conversion＆selective measurement in grounding characteristics measuring system. It analyzes estimation method of signal amplitude phase based on Fourier transform, calculates the sensitive degree of the method to frequency error, and also presents several major parameters for the algorithm, including sampling rate, data length and selection condition of frequency resolution in order to meet the high precision measurement requirements. Furthermore, the paper analyzes correction algorithm of amplitude and phase error caused by unknown nonlinearity of circuit during the practical measurement.

Abstract: In the process of very large scale integrated circuit (VLSI) manufacturing, Chemical Mechanical Polishing (CMP) technique is one of the most effective wafer global planarization techniques. The polishing quality depends not only on the slurry and polishing head structure, but also on accurately wafer polishing pressure control. However, the polishing pressure accurately control depends on a generalized pressure control system of the polishing head and multi-zones pneumatic pressure system. As the system has time-varying, nonlinear and coupling characters, it is difficult to apply theoretical modeling method for obtaining the accurate mathematical model. Therefore, this paper presents a method based on subsubmodel identification to establish the precise mathematical model of the pressure control system. The experimental results show that the method is feasible, practical and accurate.