Advanced Materials Research Vols. 734-737

Abstract: Vanadium oxide thin films have been deposited on glass and ZnO-coated glass substrates by reactive RF-magnetron sputtering deposition at different substrate temperature. The introduction of ZnO buffer layer could increase the transmittance. The buffer layer ZnO could lead to the increase of the crystallinity quality of VO₂ films and substrate temperature could be decreased to 100°C for the obtaining of polycrystalline VO₂ structure. The structure of VO₂/ZnO/glass is considered to be potentially applicable to ‘‘smart windows’’ of high total energy efficiency in architectures or automobiles. .

Abstract: Zinc oxide (ZnO) thin films were grown by magnetron sputtering onto glass substrates employing a sintered ceramic target and pure argon gas. The influence of working pressure on structure and optical performance of the thin films were studied by the measurements of X-ray diffraction (XRD) patterns and optical transmission spectra. The optical energy gap of the ZnO thin film were calculated according to the Taucs law. The results demonstrate that all the ZnO thin films have preferred orientation along (002) direction. The working pressure affects not only the structure parameters such as lattice constant, strain and stress in the plane of the film, but also the optical transmittance and energy gap of the ZnO thin films. The ZnO thin film deposited at the working pressure of 0.5 Pa exhibits the maximum average visible transmittance of 86.6%, a compressive stress of 1.72×10⁹ Pa, and an optical energy gap of 3.273 eV.

Abstract: The four factors such as alcium silicon proportion, coke dosage, burned time and the addition of solubilizer are studied in poorer oxidative atmosphere at 1200 °C. The grade-analysis and visual preferred plan of orthogonal table are reappeared.The results show the indexs of visual preferred plan of orthogonal table are perfecter,therefore,the plan is used as preferred plan.The product is separated and characterized by infrared.The infrared map shows the product is potassium sulfate . The XRD inflection of samples is studied, waste residue is also effective ingredient besides potassium slufate.It is used again to avoid secondary pollution.

Abstract: A mechanism model of coal pulverizing system is developed to calculate the coal powder flow rate entering the combustion chamber with the data of a 300MW coal-fired power plant. This model is going to be used to improve the identification accuracy of the calorific value, which usually takes the coal flow rate entering the coal feeder as the input. The model parameters are based on the structural and operational data of the pulverizing system. Results of the pseudo online identification of the caloric value demonstrate that the model can capture the dynamic properties of the system with relatively high accuracy. Therefore, there is potential application of this model to improve the control performance of the utility boiler.

Abstract: The applications of wireless sensor are the hot topic in the current research of the Yellow River Diversion Project. The realization of low-power wireless sensor is not only an focal point in the study of wireless sensor, but also one of the difficulties in the study of measuring and controlling technology. In the Yellow River Diversion Project, the low power consumption of wireless sensor node circuit has been a drawback of high cost and low accuracy. In this article, we use the improved circuit of wireless sensor node to achieve low power consumption. According to comparing with the traditional low-power circuit, we pointed out its advanttages and disadvantages. Joining negative feedback in the particular experimental circuit, the related data which had been acquired was compared, then the conclusions of the lower power consumption was obtained. In order to reducing the power loss, we could add the appropriate feedback resistor after analyzing the table.Therefore, wireless sensors are important in the Yellow River Diversion Project. The reasonable use of wireless sensors will develop the water conservancy effectivly.

Abstract: With aim to test the earth channel characterization, a simplified through-the-earth communication system is established, and hence an experiment transmitting single frequency and modulated elastic wave signal through a two-layered earth channel model is performed. By analysis of experimental results, the earth channels amplitude-frequency and fading characterization are achieved. Also conclusions can be drawn as: (1) from the wave form, we can see that the receiving signal fading is an evident feature, the amplitude near the moment of phase transition is lower than other moment; (2) from the spectrum we can see that the high frequency components attenuate more heavily than the low frequency components. The experiment results also show that the experiment channel attenuation is at minimum level at 200-300Hz.

Abstract: High-cencentration slurry transport can reduce the water content in bottom sludges and relieve the dehydration pressure in slurry storage areas, therefore accelerating the follow-up dealings with sludges and improving resource utilization. To meet such demand for high-concentration slurry transport, this article makes designs for a set of pipeline transportation testing apparatuses, and offers possible follow-up research with testing evidences such as measurements of pipeline pressure and concentration distribution, as well as monitored slurry flow regimes inside the pipes.

Abstract: A telemetry and telecontrol universal simulator (TTUS) based on Windows CE was developed. TTUS adopts PCI bus, and CPU main board and peripheral boards are inserted in slots of PCI backplane. TTUS can be used for performing a testing of analog telemetry, digital telemetry and remote control for power equipment. TTUS also supports indirect telemetry and indirect telecontrol via the CAN bus or 485 bus. TTUS control software which runs on the TTUS was developed using VC ++. Program blocking technology and high-resolution time technology were introduced in this paper. The telemetry and telecontrol universal simulator can be used for product testing in far away places of electromagnetic radiation or other dangerous places. Remote test software could be developed for testing the power equipment using function library provided by TTUS.

Abstract: The relation curve of the raw water flow and main steam pressure under different main stream temperature is established by off-line experiments and expert experiences. For the time-varying in heat conduction coefficient, which is resulted by scaling and so on, water level need to be detected by installing float level gauge in every effect, and the curve can be corrected according to water level, so effective separation space of gas and water is ensured to avoid dry or flood pot. Because medical water distiller need to provide pure steam, by detecting the output flow of pure steam, correct the curve and inhibit the interference of production process due to pure steam output, then the production process of distilled water can be finished by automatically controlling the adjustable valves of raw water flow and main stream pressure. The method will improve the robustness of heat conduction coefficient time-varying and pure steam output interference.

Abstract: Applying the instantaneous polarization statistics about electromagnetic waves to the instantaneous polarization characterization and property of a target infrared signature. The target polarization signature could be extracted and identified by means of polarization filtering and polarization detecting against a target and its background.