Advanced Materials Research Vols. 490-495

Abstract: The flow field of car exhaust pipe using ethanol gasoline has been researched, the continuity equation of a mixed two-phase model have been established by means of the mathematical model of two-phase flow field, and the simulation for the velocity distribution of droplets radial slipping in exhaust gas have been achieved. By using the divided grid and setting these four boundary conditions as conditions of the entrance, flow conditions at the end of the export, overflow conditions of the export, solid-wall boundary conditions, the iterative steps of calculation process and the relationship among the residuals of various parameters have been obtained. State of exhaust flow have been calculated using algebraic slip model (ASM) ,obtaining the distribution rule of the internal flow field in exhaust pipe for the disconnection of steam-water ,and the characteristics relationship of separation for two-phase flow field of steam-water. The characteristic relationship among flow, split ratio and separation efficiency have been numerically simulated. The existence of the best range of split ratio for a particular exhaust pipe has been confirmed.

Abstract: This paper focuses on the application of Optical fiber sensing technology in bridge health monitoring. The health and safety monitoring system of the new large bridge based on the fiber Bragg grating (FBG) sensing technology of Hubei Jing Yue Yangtze River Highway Bridge as an example, its health and safety monitoring system in using period based on FBG sensing technology was introduced in detail. The construction and the key point monitoring sensors design of the intelligent system were shown in the paper.

Abstract: A novel CO₂ absorbent, MgO-ZrO₂ nanocomposite was synthesized via appropriate sol-gel process. The structure and surface properties of the as-prepared materials were characterized by XRD, N2 adsorption-desorption and CO2-TPD techniques. It was found the as-prepared materials showed high thermal stability, and their mesoporous framework was well preserved even after calcinations at 700oC. In addition, the nanocomposites exhibited appropriate basic strength and the basic sites were tightly anchored to the substrate, which greatly improved the stability of the surface basicity. Owing to the advantages of the mesoporous structure and the surface basicity, the as-prepared MgO-ZrO2 nanocomposites showed high CO2 adsorption capacity. Moreover, the high thermal stability of MgO-ZrO2 could greatly increase their performance in high-temperature application, which remarkably overcame the poor thermal stability of those organic group grafted porous silicas.

Abstract: Emerging of nanotechnology represents development and achievements of modern materials science. Petroleum industry nowadays plays a leading role in development of energy industry. Therefore, the combination of the two is a valuable research subject. The prospect of application of nanometer material in injection-production, tertiary oil production, well sensing and imaging system and coating technology is presented herein. In addition, issues with respect to application of nanometer material in oil exploitation are discussed. Nanometer material and nanotechnology is the frontier technology in science and technology development in the past decades. It is predicated that today's ordinary original material be replaced by nanometer material and nanotechnology be a "key technology"[1] that will surpass internet and genetic technology.

Abstract: Carbon spheres were synthesized by chemical vapor deposition. The products deposited at different zones were separately collected. Furthermore, an anodic aluminum oxide template was used to control the size of carbon spheres. The products were characterized by field-emission scanning electron microscopy, high resolution transmission electron microscopy and X-ray diffraction. The results show that carbon spheres with controllable size distribution were obtained and the size distribution of these carbon spheres can be controlled to some degree by deposition zone and anodic aluminum oxide template.

Abstract: The synthesis of platinum nanoparticles by reduction of H2PtCl6 with ascorbic acid has been studied. By high-resolution electron microscope and XRD analyses, the resultant nanoparticles have been found to be pure platinum of fcc structure. Their sizes were observed to increase with the increases chemical reductive with 24h. Then, platinum nanoparticles directly attached to Ti plates(Pt nanoparticles/Ti) were successfully fabricated. In this method, platinum nanoparticles could be grown on the Ti surface via the one-step immersion into the growth solution containing PtCl62- and ascorbic acid. The attached and grown platinum nanoparticles were spherical having an agglomerated nanostructure composed of small nanoclusters. The present Pt nanoparticles/Ti may be promising for a new type of electrode material.

Abstract: The β-SiCp/Al electronic packaging composites with excellent performance were successfully fabricated by pressureless infiltration technology in air.The effects of alloying elements, infiltration temperature and time on infiltration process and application of -SiC were studied.The results show that by adding appropriate magnesium to aluminum matrix, a interface reaction between oxide films of SiC and magnesium occurs, and the interface reaction product MgAl2O4 is generated, the interface wettability of Al and SiC and pressureless infiltration are improved.The interface harmful phase Al4C3 can be inhibited by adding silicon to aluminum matrix.Identified 850°C for the best infiltration temperature, and the thickness with infiltration time and larger, infiltration rate is about 10mm/hour.Under the same parameter conditions, the thermal properties of β-SiCp/Al electronic packaging material are 4 ~ 6% higher than that of ɑ-SiCp/Al. The β-SiCp/Al electronic packaging materials with 66% SiC volume ratio has lower coefficiency of thermal expansion than those ɑ-SiCp/Al electronic packaging materials.And the thermal expansion coefficient and thermal conductivity of β-SiCp/Al electronic material can satisfy the requirements for electronic packaging materials.

Abstract: A new LCD interface design is put forward in this paper. The design solves the problems of taking too much time to deal with data and different interfaces which exists in common LCD. With this method, it is not necessary to proceed time-consuming LCD control and dot matrix operation, which is in favor of real-time processing of mass data by controller.

Abstract: The smallness of neutrino masses is naturally explained by the seesaw mechanism, which is usually implemented by assuming a small Dirac mass of order charged leptons’ and a large mass of sterile neutrinos of order GUT scale [1]. This makes heavy neutrinos experimentally inaccessible. If heavy neutrinos have a mass of order electroweak scale, they could be detected at high energy colliders. A model with this feature built in has been suggested recently by Hung. We analyze the constraints on the unknown parameters in the decay μ → eγ and μ →3e.

Abstract: The accurate count has been realized and the expected results have been acquired by the image of the end of steel pipes recognized, which has a good market prospect and economic profit. The mathematical morphology was used to preprocess image and inspect the edge of the target. An improved Hough Transformation was applied to recognize inner diameter of steel pipes, which improved the detection rate. The Hu invariant moments described in the area was used to recognize inner diameter of steel pipes, which realized the pipe sum accurately. The method to count points was used to realize the sum of pipes according to the condition that the inner diameter circus of binary pipe image was corroded more times came to change into small area.