Abstract: Using resistive heated method, Ti films of different thickness ranging from 10 to 200 nm were deposited and post-annealed at a temperature of 473K with a flow of oxygen. The optical properties were measured by transmission spectroscopy in spectral range of 200-2500 nm. The optical functions were obtained from the Kramers-Kronig analysis of the reflectivity curves. The effective medium approximation analysis was employed to establish the relationship between the nano-structure and Effective-Media Approximation (EMA) predictions.It was found the temperature of deposition and thefilm thickness play important roles in the nano-structure of the film and cause significant variations in the optical behaviour of thin Titanium oxide films.
Abstract: The perfect mathematic model is critical to reseaech the NOx emission charateristic. In this paper, a new statistical learning algorithm SVM(support vector machine) was used to establish the model, based on the mechanism analysis of the NOx emission characteristics, and grid optimization method was applied to determine the model parameters. The model was tested on a 660MW power plant ,and the result indicated that SVM was a good tool for building NOx emission model and had better generalization ability and higher calculation speed comparing with BP modeling approaches.
Abstract: Image retrieval has been one of the most interesting and vivid research areas in the field of computer vision over the last decades. Content-Based Image Retrieval (CBIR) systems are used in order to automatically index, search, retrieve, and browse image databases. There are various features which can be extracted from the image which gives different performance in retrieving the image.al systems. In this paper we have tried to compare the effect of using different features on the same data base to implement CBIR system. We have tried to analyse the retrieval performance for each feature. We have compared different features as well as the combinations of them to improve the performance. We have also compared the effect of different matching techniques on the retrieval process.
Abstract: In the paper, the effects of the holding time and temperature on Sr content of the Mg-Sr master alloys produced by the metallothermic reduction of SrO into magnesium melt were investigated. The results preliminarily indicated that effects of the holding time and temperature on the Sr content of the Mg-Sr master alloys produced by the metallothermic reduction of SrO into magnesium melt were relatively obvious. For a given experimental conditions: magnesium melt of ~10 kg and powder flow rate to carrier gas flow rate ratio of 20 g SrO/min / 15 L Ar/min, with the increasing of holding time from 30min to 150 min at 800 °C or holding temperature from 700°C to 850 °C for 90 min, the Sr content of the Mg-Sr master alloy increased gradually. Obviously, the long holding time or high holding temperature was beneficial to produce Mg-Sr master alloys with high Sr content by the metallothermic reduction of SrO into magnesium melt.
Abstract: A triple-cathode plasma surface alloying technology has been invented, which has been used to carburize on a surface of pure titanium in an operation of hydrogen-free. A plasma carburized layer has been obtained on a sample of pure titanium, which features were examined with GDA and ToF_SIMS. The result is pointed that this kind of carburized layer possesses some special and interesting characteristics.
Abstract: The FeNiMm (Mm = rare earth metals) electrodes have been successfully prepared by vacuum induction melting (VIM) technique and used to be active cathodes in chlor-alkali industry for the first time. The alloys are found that Mm content and Fe content has significant impact on the polarization characteristics of the FeNiMm electrodes. With the increasing of Mm content, the η200 change a little but the apparent exchange hard, and increasing the content of Fe and decreasing the content of Mm will have a negative effect on the electrocatalytic performance. Fe84.50Ni7.72Mm7.72 was found to yield the highest intrinsic electrocatalytic activity. On the power interruption term, the cathodes exhibit excellent resistivity against repeated power interruptions.
Abstract: To research the flow field characteristics in the shuttle check valve, this paper adopted numerical simulation and contrast method. Based on ADINA, it respectively implemented geometric modeling, parameter setting and fluid-structure interaction calculation on the shuttle valve and the swing check valve. By analyzing visualization results, it derives that the former has the advantages of uniform velocity distribution, steady flow state, equilibrium load on the valve core, etc. compared with the latter in the process of opening, thus providing data basis for optimal design of the shuttle valves.
Abstract: We theoretically analyzed the microwave NEMS (Nano- micro- electronic mechanical systems) porous substrate materials and relevant characteristic to NEMS functions to achieve the balance of high performance and the low-cost. And the introduction of the micro fluidic cofferdam development was given at a Glance. ANSYS software was applied on NEMS beam switch simulation. The comparison result was drawn: the threshold voltage of the NEMS beam switch closure increases with metal Young's modulus of the material increases.
Abstract: Resonator structures have been proposed and modified as a method of reducing the group velocity of light for optical buffering in telecommunication field. This makes the characterization and optimization of the method become important to apply. In this paper, the characterization of vertically coupler resonator is modified by investigating its geometrical parameters. The modified models with conical rod portion as the slow light structure is described where the group velocity parameters are varied. The results found that the separation gap between fibers, lg and the rod radius, a are significant in reducing the group velocity of light through such a system in the case of lossless resonators.