Applied Mechanics and Materials Vols. 52-54

Abstract: Stress shielding phenomenon is an important issues in considering the primary stability of the cementless hip arthroplasty. Stress shielding occurs when there is a mismatch in the elastic modulus of two materials perfectly bonded to each other, such as the prosthesis stem and the bone. In this study, influences of different prosthesis stem lengths on stress distribution in cementless THA are examined using finite element method. The calculated stress distribution is discussed with respect to stress shielding and primary stability issues in THA femur cases. Results show that similar pattern in stress distribution for intact and THA femur but differs in magnitudes. The stress level increases from the neck to the middle region and peaks at locations coinciding with the tip of the prosthesis. The maximum stress for intact femur is 55.5 MPa, THA with short stem is defined up to 112 MPa, while with medium and long stem are 204 MPa and 278 MPa, respectively.

Abstract: The ternary solid solution BiOCl0.2Br0.1I0.7 was successfully synthesized using a wet chemical method. The visible light photocatalytic properties of BiOCl0.2Br0.1I0.7 were investigated for the first time. Powder samples were characterized by XRD, SEM, UV-vis spectrophotometry and nitrogen sorption. BiOCl0.2Br0.1I0.7 absorbs intensely in the visible light region and the optical bandgap is 1.82eV. The chlorine and the bromine elements have an obvious effect in changing the bandgap energy and the particle size of the catalysts. The deep valance band edge position, the internal electric fields and the morphology give the BiOCl0.2Br0.1I0.7 best visible light photocatalytic properties.

Abstract: By the analysis on the manufacturing industry, logistic industry, information and technology integration, and regional advantage of manufacturing logistics in Guangxi,China -ASEAN (Association of Southeast Asian Nations) economic zone, modern manufacturing logistics technology, this article provides the realization means and pattern for the information integration and joint development of manufacturing industry and logistic industry. Information integration and joint development of manufacturing industry and logistic industry of Guangxi,China-ASEAN is by using regional logistic supply chain IFA (Intelligent Flexible Architecture), according to the advantage of Value China by modern logistic joint development, to establish an information integration and combined public service system supported by IOT (Internet Of Things), Internet and CTI (Computer Telecommunication Integration), defines information integration as the middleware to develop U type smiling curve of Guangxi-ASEAN manufacturing industry and logistic industry, and uses multiple modules structure model arithmetic to form Guangxi-ASEAN information integration and joint development model, which realizes information integration and joint development system of logistic socialization, regional economic integration, and logistic factors permutational aggregation for manufacturing industry and logistic industry.

Abstract: Artificial neural networks (ANNs) are one of the most recently explored advanced technologies which show promise in the factory monitoring area. This paper focuses on two particular network models, back-propagation network (BPN) and general regression neural network (GRNN). The prediction accuracy of these two models is evaluated using a practical application situation in a monitor factory. GRNN emerged as a variant of the artificial neural network. Its principal advantages are that it can quickly learn and rapidly converge to the optimal regression surface with large number of data sets. According the simulation results we can show that GRNN is an effective way to considerably improve the predictive ability of BPN.

Abstract: The red clay in Kunming New Airport had negative effect, such as more settlement, the differential settlement, the poor property of compactness and water content too difficult to control during construction. Therefore, there were a serial in situ tests for the red clay foundation: (1) the red clay foundation was treated by the dynamic consolidation method(DCM) with cushion and the gravel pile method, then the embankment of red clay, (2)the natural foundation of red clay was filled directly by red clay and Douposi highly weathered material as the embankment material. Their deformation and pore water pressure rules of natural red clay foundation, foundations treated by DCM and gravel pile were obtained on the condition of high embankment by monitoring of settlement, horizontal displacement and pore water pressure. Test results showed that (1)during the embankment construction period, the settlement of DCM test region was maximum, the gravel pile test region second, the natural foundation of red clay was minimum.(2) the low velocity of layered horizontal displacement indicated that the slope was stable. (3) the increasing and dissipation of pore water pressure was accordance with the embankment history. (4) because it was on the embankment construction period, the monitoring data just reflected the deformation rule in the initial stage of loading.

Abstract: Microwave processing ceramics is emerging fast as a new field of ceramic processing and material synthesis. The past year has witnessed significant progress in the aspects of commercialization and application of the technology to new areas. Further research states that Titanium Carbide (TiC) is the best cutting tool due to its high melting point and by that reason this project aims to show the difference between conventional sintering, microwave sintering and Hot Isostatic Pressing (HIP). Two different compositions consisting of 97TiC3Ni and 93TiC7Ni were sintered using conventional furnace, microwave furnace and HIP. Density, hardness and microstructure analysis were carried out on these TiC inserts. 97TiC3Ni produced higher density and hardness values compared to 93TiC7Ni for all three different methods. Microwave sintering produced the highest density and hardness values compared to conventional sintering and HIP. Microwave produced samples with improved density and hardness in a shorter processing time which is 93% faster than conventional sintering and 50% faster than HIP.

Abstract: The paper presents a research and design of a high speed vacuum switch whose actuator consists of an electromagnetic repulsion driving unit (ERDU) and an permanent magnet force holding unit (PMFHU). A 2D finite element model of ERDU is established. The discharging current waveform, the repulsion force waveform and the effect of different distance between the driving coil and the metal plate on force are analyzed based on this model. Three types of PMFHU are proposed. And those holding force curves are acquired by 3D static magnetic analysis and compared with the measured data from the PMFHU prototypes. At last, the mechanical characteristics of the high speed switch prototypes assembled with three types of PMFHU are tested. The results show that the properties of Model 2 meets the requirements of high speed repulsion actuator most.

Abstract: Mammography is a specific type of imaging that produces an X-ray picture of the human breast. Detection of tumors at an early stage is important step in diagnosis of the abnormalities in mammograms. In many of the cases, preprocessing process of the raw image involving of enhancement, filtering and determination of textural features have been necessary for successful implementation of this study. Raw image is applied histogram equalization method in order to enhance the image intensity. Thus, the noise of that image is eliminated using Gaussian filtering method. Gabor wavelet based algorithm such Gabor filter is used to extract the feature of that images.

Abstract: Optical waveguides have been known as basic structure in integrated optics. The result of waveguide analysis is very useful to apply before fabrication process begins. In this paper, optical propagation characteristic of straight waveguide on light intensity distribution within the structures have been investigated at 1.55 micrometer waveguide. The normalized propagation constant b and effective refractive index neff conditions have been considered for the straight waveguide for single mode propagation. Both the propagation characteristic can be calculated efficiently on the personal computer by using MATLAB programming. The analysis has been analyzed using a numerical method based on finite difference method approach. The result of optimization analysis of waveguide according to the parameter study can help in practical work in designing an optical waveguide easily.

Abstract: Traditionally a gear shift with clutch control makes the synchronisation phase unnecessarily long torque gap time. Gear shifting by engine control realizes fast gear shifts by controlling the engine instead of sliding the clutch to a torque-free state in the transmission. Detailed mathematical models of different driveline states are presented and to improve driving comfortable. Theoretical analysis results are compared with experimental ones from the road experience in equal conditions in order to prove the validity of the gear shifting control strategy.