Advanced Materials Research Vols. 518-523

Abstract: The Assimilable Organic Carbon (AOC), Microbially Available Phosphorus (MAP), Heterotrophic Plate Count (HPC) and Biodegradable Dissolved Organic Carbon (BDOC) of eight sampling points were analyzed for studying the biological stability of drinking water in Jinan. Biological stability of drinking water can standard basically in Jinan city. There had a certain correlation between AOC and HPC. The AOC indicator was gradual increased from April to May and June to July. There may be related to the seasonal change of Yellow River. The control of AOC was an effective way to improve the water quality.

Abstract: In south hemisphere regions mortality rates are closely related to infectious diseases that, to a large degree, depend on the quality of water consumed and on access to adequate sanitation services. A special attention must be paid to water quality particularly in case of an earthquake. Damage in this sector depends not only on the intensity of the disaster, but also on the vulnerability of buried pipelines. In this work, this vulnerability is studied through the use of a developed vulnerability index. This one allows a good classification and description of the seismic quality of the pipes taking into account the main parameters governing their vulnerability. A program including all informations that might be used was subsequently developed. The method was applied on the water network of Blida, a city in suburb of Algiers. The results obtained show that the established classification confirms the observed information in situ.

Abstract: The water source of one ultra-supercritical fossil-fueled power plant is municipal reclaimed water and reservoir water. Techno-economic comparison of several schemes for recirculating cooling water treatment system show that the side stream lime softening treatment system is an optimal scheme. It has comprehensive functions of scale prevention, corrosion prevention and removing suspended solids, and the system combines the make-up water softening treatment system and the side stream suspended solid removal treatment system of recirculating cooling water, which reduce the investment and the operation cost, and meet the requirement of maximum water saving. The side stream lime softening treatment system is energy saving and discharge reduction.

Abstract: Abstract: As the living standarda are improving constantly, people are paying more attention to the supplying of safety drinking water. In the rural areas, people are worried about the problem of drinking water supplying. This thesis is taking the rural areas in Zhejiang province as an example to discuss the existing problems of the supplying of drinking water and the options to deal with these problems.

Abstract: The pipe model is simplified as elastic foundation beam model of Euler-Bernoulli in the paper. The supported forms are fixed support and free support in the analysis of axial vibration. Kelvin viscoelastic foundation model is adopted and the dynamic model of soil spring is regarded as linearity. Applying the principle of Hamilton, the differential equation of axial vibration is deduced. By utilization of the first three-order modal and the orthogoality of main vibration mode, the equations of earthquake excitaiton are discreted and transformed into common form of dynamic equation. A typical numerical example is analyzed by using of the Matlab software.

Abstract: Based on the analysis of the corona noise, the UV image from bus-bar in some typical designed substation, and the calculations of the 3-dimensional finite element models of spacer, the conclusion is drawn that the two-bundle conductor spacers are the main sources in the switchyard. Differentiation design is applied to optimize the end fitting structure the results show that the surface electric gradient of the optimized spacers can be the same level as that of the bus-bar, which reduces the corona noise in the yard.

Abstract: The exciting force’s accurate measurement of is crucial to the structure-born sound radiation. Forced vibration and sound radiation of the ribbed cylinder is examined in the anechoic room. An approach called added mass and damping method is proposed to calculate the elastic vibration and acoustic field of the cylinder. Results obtained from simulation are show to be in good agreement with the experimental data. Sound radiation induced by different input loading form is examined via simulation and experiment. And the equipollence of force and pressure acting on the base is validated.

Abstract: High quality ZnO thin films are required to produce CMOS SAW resonators operating with low losses and high Q. This work intends to develop high performance CMOS SAW resonators through optimization of both the quality of the ZnO and the design of the SAW resonator. Zinc oxide was chosen for this work as the piezoelectric material due to its superior acoustic propagation properties and compatibility with integrated circuit fabrication techniques. ZnO has demonstrated good performance characteristics for a variety of piezoelectric devices. For optimization of the quality of the deposited ZnO thin film, different RF-sputtering conditions will be used to investigate which condition produces the best piezoelectric quality of the ZnO thin film. The experiments were carried using Taguchi optimization method, which studies a large number of variables with a small number of experiments.

Abstract: Vibration signal carries dynamic information of rotating machinery and the useful information often is corrupted by noise. Effective signal de-noising and feature extraction methods are necessary to analyze these signals. In this paper, an improved lifting scheme is proposed for such vibration signal analysis. The auto-correlation factor of scale decomposition vibration signal is used as to optimize the prediction operator and update operator at each sample point, which can adapt to the vibration signal characteristic. Improved lifting scheme decomposition and reconstruction procedures are designed. Experimental results confirm the advantage of the proposed method over redundant wavelet transform for rolling bearing fault diagnosis, and the typical fault features in time domain are desirably extracted by improved lifting scheme.

Abstract: Characteristics impedance is a very important physics parameter for many applications in rock fragmenting and percussive drilling. When the shape of the elastic bar is very complicate, it is difficult to calculate the characteristics impedance of the elastic bar with its definition. A method which uses the incident wave and reflected wave to calculate the characteristics impedance of elastic rods is presented. Firstly, the relationship of the incident wave, reflected wave and the characteristics impedance of elastic rods is studied on the basis of the reflection and transmission laws of elastic waves and, the resolution model is established; Then impact experiments were carried out in which a drilling bit with step cross-section was designed. The signal processing of eliminating polynomial trend item and discrete wavelet de-noising were done to stress signals before calculation to decrease the error. It is proved that the method is adequately accurate from the testing results.