Advanced Materials Research Vols. 463-464

Abstract: We research the influence of reinforced concrete beams crack on size effect by using the fracture Mechanics analysis method and Fracture toughness. First, the weight of three spot curved beam ,the load ,the steel bar, and the cohesive strength of breaking-down process area were superimposed of the stress intensity factor which has in the crack tip, in order to examine whether it has surpassed the fracture toughness, and judge the crack whether will be to expand. Then we went to iterative computation through increasing the load and the crack length which obtained the carrying capacity of corresponding size component, we used the Matlab programming in the entire computational process. The result shows that although the steel bar limited crack expansion of concretes beams and caused “the plasticity” characteristic, the reinforced concrete beams had the size effect phenomenon still, it did not obvious compare with the plain concrete.

Abstract: In this paper, hazardous materials transportation monitoring system is designed, implemented, and tested using Wireless Sensor Networks (WSNs). According to energy consumption and response time during clustering of Wireless Sensor Networks LEACH (Low Energy Adaptive Clustering Hierarchy) routing protocol, we proposed STATIC-LEACH routing protocol based on static clustering, it can effectively reduce energy consumption of the wireless sensor nodes and reduce network latency of cluster. With WSN and GSM/GPRS, low cost and easy deployment remote monitoring is possible without interfering with the operation of the transportation.

Abstract: The application of glazes on clay-based ceramic products has been identified as one of the best form of ceramic decorations. This can be attributed to its characteristic to lend aesthetic value to ceramic products and also to render them more durable, useful and hygienic. This paper reports an investigation on the development of new ceramic glaze recipes by means of selected glaze software packages using locally available raw materials in Nigeria. For the achievement of this study, survey methods, material oxide analysis, as well as kiln firings have been used. The results established the possibility of using existing glaze software in Nigeria so as to derive new recipes from old ones by using local material analyses database. The study indicates that with recent technological solutions, local raw materials can be properly identified and maximally utilized for a nation’s industrial development and sustainable economic growth.

Abstract: Fluorescent core/shell CdTe@SiO₂ particles were prepared via reverse microemulsion method. When all the other parameters were kept constant, a simple linear relation was deduced to describe the connection between SiO₂ shell thickness and volume of tetraethyl orthosilicate(TEOS). The results indicated that linearity and morphology of CdTe@SiO₂ were better when the volume of TEOS ranged from 5μl to 200μl. Nevertheless, further decreasing the volume of TEOS to 2 μl led to a poor spherical regularity and if the volume of TEOS was larger than 200μl, size changes of CdTe@SiO₂ were no more clear because of restrained size of water pool

Abstract: CuO has been doped solely and together with BaO and SiO₂ into barium titanate by mixing and calcination. X-ray diffraction showed that the sample doped by CuO-BaO has stable second hexagonal phase while the samples doped by CuO, CuO-SiO₂ were of a pure perovskite phase. For CuO-BaO doping, the Curie temperature was decreased accompanied with higher εmax; while for CuO doping and CuO-SiO₂ codoping, the Curie temperature was increased with εmax decreased. The difference can be explained considering that Cu²⁺ ion could not only incorporate into the BaTiO₃ lattice, but also assemble in the boundary phase when CuO was doped solely. Besides, the mechanisms of CuO doping and SiO₂ doping could happen at one time.

Abstract: To discover the polytetrafluoroethylene (PTFE) powder size impact to Mg/PTFE pyrotechnic composition, hot compatibility of various particle sizes of PTFE powder with spherical superfine Mg powder was studied. Safety performance of Mg/PTFE pyrotechnic composition was also researched by parameters of friction and impact sensitivity. Burning temperature and velocity were recorded and analysed. The result shows that the Mg/PTFE exothermic temperature peak floats =0.8~2.2°C, apparent activation energy alter ratio (AAEAR) =12.5%~17.8%, ignition probability due to friction sensitivity =0.32~0.48 and to impact sensitivity =0. It indicates that PTFE powder size will not inflect the safety of Mg/PTFE composition, which burns more stable with PTFE size great than 400μm. Once mass combustion velocity 2.09~3.87 g•cm-2•s-1 and linearcombustion velocity 5.02~8.13 mm•s-1, the combustion velocity will increase much by following with PTFE particle sizes decrease.

Abstract: With the help of Photoacoustic tomography ( PAT) to precise positioning the tumor in tissue which use gold nanoparticle as contrast agents , this paper proposes the One Temperature Model (OTM) to analysis the influence of the temperature effect in PAT. The first time quantitative analysis and verify the nanoparticle’s temperature gradient on the importance of PAT.

Abstract: Nanocrystalline samples of titanium dioxide (TiO₂) monodoped or co-doped with La and Y were prepared by a facile method, using Ti(OC₄H₉)₄ as the precursor. All products were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and UV-visible diffuse reflectance spectra (DRS), respectively. Photocatalytic activities of the products were assessed by the photocatalytic decomposition of methyl orange (MO). Both of undoped TiO₂ and doped-TiO2 samples exclusively consist of primary anatase crystallites, which further form spherical aggregates with diameters ranging from 14 to 21 nm. The photocatalytic performances of rare earth (RE) element co-doped samples were much higher than that of single doped and pure TiO2 under UV-visible-light irradiation. It indicated that a strong La-Y synergistic interaction appeared to play a decisive role in driving the excellent photocatalytic performance of LYT.

Abstract: Performance of a fixed displacement hydraulic balance vane pump, theoretically and practically was studied by application of the hypertrochoid curve in the inner surface of its stator. In addition to improving a sealing action between pressure and suction sides of the pump, one of the important characteristics of the hypertrochoid profile is improving of the inertial reaction of the vanes in each position where these vanes have a radial movement. Then it causes a smooth sliding motion of the vanes, and hence, a higher performance of the pump while attaining a longer life of it because of decreasing vane- tip and inner surface of stator wear and decreasing of vibration, noise and high stresses.

Abstract: In the latest our works, Performance of a fixed displacement- hydraulic balance vane pump, theoretically and practically was studied by application of the basic hypertrochoid curve in the inner surface of its stator. Also the effect of the inertia force of the vanes on the performance of the pump with this curve was studied. This study presents a theoretical analysis of the internal pressure distribution in the pump, and of the resulting forces and torques applied to its components. This analysis is essential to the study of the pump dynamics and control, the pump design, and selection of the pump bearings. These forces are shown to be a function of the line pressure, the shaft rotational speed, the fluid bulk modulus, the fluid viscosity, and the design geometry. These forces are composed of two components: a continuous component due to the exposure of chambers to the line port, and an intermittent component due to a hydraulic lock phenomenon.