Advanced Materials Research Vols. 479-481

Abstract: The project is aimed at describing the mixing phenomena of the new reactor. The solide catalyst deposit on the surface of tubes which affect the flux of the reaction product liquid. The liquid scouring effect is necessary which is relate to the velocity of surface tubes. The new design structure i.e.solide catalyst and liquid in a stirred reactor has been simulated using computational fluid dynamics model (CFD). The arrangement of tubes creat a great effect on the behavior of the fluid, especially the veclocity of surface of tubes. The tank with draft dubes or not have obvious different on the power cosumption and the distribution of solid particles. Power consumption is also taken into account. Compared with Japonic reactor, the design reactor is energy saving which have good potential development.

Abstract: Randomly orientated electrospun poly(vinylidene fluoride) nanofiber membranes were directly used as active layers to make mechanical-to-electrical energy conversion devices. Without any extra poling treatment, the device can generate high electrical outputs upon receiving a mechanical impact. The device also showed long-term working stability and ability to drive electronic devices. Such a nanofiber membrane device may serve as a simple but efficient energy source for self-powered electronics.

Abstract: Particle Swarm Optimization (PSO) is a novel artificial intelligent technique proposed by Eberhart and Kennedy which is a type of Swarm Intelligence. PSO is simulated as population-based stochastic optimization influenced by the social behavior of bird flocks. In past decades, more and more researcher has been targeting to improve the original PSO for solving various problems and it has great potential to be done further. This paper reviews the progress of PSO research so far, and the recent achievements for application to large-scale optimization problems.

Abstract: To improve the accuracy of temperature measurement using infrared imager in complex background environment, based on the principles and the formulas of temperature measurement using infrared imager, altering spectrum method in the infrared temperature measurement was derived. For the temperature measurement of gray body in complex background environment, three response bands should be selected in temperature measurement, and then the surface temperature could be obtained by solving responding two iterative equations. This method could be achieved technologically by two means: setting filters in front of infrared imager, or using infrared imagers with different bands. The simulation results show that the temperature of measured object could be obtained with high accuracy through the method, and its error is very small. Through this method, the temperature of measured object could be obtained without knowing its emissivity and background radiation, so the error caused by the measurement of the emissivity of measured object and background radiation could be reduced.

Abstract: Supplier selection and evaluation is an important part of environmental purchase in green supply chains. How to determine suitable suppliers in the supply chain has become a key strategic consideration. Although there are many approaches having been put forward by researchers, however, considering the complex and unstructured nature of these decisions, the paper conducts an analysis on how to select desired suppliers by AHP, followed by a case study in an enterprise in China.

Abstract: Raw materials kaolin was subjected to mechanical modification; the effect of the mechanical activation of kaolin on the compressive strength and morphological properties of the geopolymers has been studied. Mechanical activation of the kaolin results in particle size reduction and morphology changes with increase in reactivity. Mechanical activated kaolin has overall higher strength gain compared to raw kaolin. Wider particle size distribution and some spherical particles produced, promote a higher packaging density in the sample resulting in higher strength obtained. Mechanically activation of kaolin can be considered as an alternative method to achieve better geopolymerization reaction for kaolin-based geopolymer.

Abstract: The paper shows the constituents and technical properties of low calcium aluminates cement concretes with ultra dispersed mineral powders and admixtures.

Abstract: To assess environmental feasibility of Beize coal washing and separating plant and predict it’s influence to ambient, according to government laws, codes and regulations such as 《The Specific Guide to Environmental Impact Assessment》 and technical features of the project, the range, grade, standards and factors of current situations evaluation were determined. And then the current situations on air, surface water and noises were measured. The average daily concentrations of TSP, SO₂ and NO₂ in air were 0.056～0.282 mg/m³, 0.037～0.039 mg/m³ and 0.016～0.036 mg/m³ respectively. The shared rates of TSP, SO₂ and NO₂ are 48.6%, 29.5% and 21.9% respectively. This indicates that all subindexes have certain environmental carrying capacity. Except pH, COD, NH₄₊-N and oil likes in local river exceeds level Ⅲ standard of water body far away. The river was polluted heavily. Acoustic environment satisfies the level Ⅱ standard of 《Environmental Noise Standard on Urban Area》. All this work laid a sound foundation for the next environmental influence prediction and appraisal.

Abstract: Based on the analysis of the state of human body falling, this paper designed a kind of fall detection alarming apparatus based on the change of acceleration. The principle is detecting the 3-axis’s acceleration change of sensor caused by change of the body posture when the wearer falls down. When the signal of body falling is detected, the fall detection alarming apparatus emits audible alarm signals. The alarm information will be send to guardian automatically through short message or calling by GPRS module, at the same time, it will be store and send to remote monitoring web page of the smart home through IEEE 802.15.4E wireless way in order to remote alarm notification.

Abstract: CeO₂ nanoparticles were synthesized by homogeneous precipitation in mixed solvent of alcohol and deionized water under microwave radiation using Ce(NO₃)₃•6H₂O and HMT as starting materials. The structure and morphology of the products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), selected-area electron diffraction (SAED), and BET-N₂. The oxide chemical mechanical polishing (CMP) behavior of the as-papered CeO₂ abrasives was investigated by atomic force microscope (AFM). The results indicated that the obtained CeO₂ particles were monodispersed with an average diameter of ca. 10 nm. There was a quite good consistency in the particle sizes from TEM and BET analyses. Polishing tests showed that the as-prepared ceria abrasives exhibited a good oxide CMP performance, which might attribute to the uniform size and shape of the as-prepared CeO₂ particles. In addition, the polishing pressure had an obvious influence on the surface topography, profilogram and roughness.