Applied Mechanics and Materials Vols. 121-126

Abstract: General triaxial CD and CU tests are conducted to properly understand mechanical property of cement-soil. Experiment data indicate that: (a) different stress paths have some but little influence on the strength of cement-soil; (b) under low confining pressure, cement-soil is similar to highly overconsolidated soil with shear dilatancy property; but under high confining pressure, it is similar to slightly overconsolidated soil; (c) its residual strength increases linearly with the increase of confining pressure, and the residual strength of CD test is greater than that of the CU test; (d) the ratio of residual strength to peak strength increases with the increase of confining pressure, while its increasing rate decreases; (e) the effective stress envelope of CU test and that of CD test are basically identical.

Abstract: Contamination can change the physical properties of soil, reduce the strength of cemented soil foundation, and then induce the instability or disruption of buildings. This study explored the relationships among the age, electrical resistivity, unconfined compression strength, contamination of municipal sewage concentration. Firstly, we mixed the silty clay with municipal sewage of five different concentrations to form the contaminated soil. Then, mixed the contaminated soil with ordinary portland cement to form the cemented soil blocks. Finally, measured the unconfined compression strength and electrical resistivity of these blocks. The results show that the unconfined compression strength and electrical resistivity increase linearly with the increase of the logarithm of age, and decrease exponentially with the increase of municipal sewage concentration. The unconfined compression strength of cemented soil has a linear relationship with its resistivity. The municipal sewage concentration and age can be use to predict the unconfined compression strength of cemented soil.The predicted values correlate well with the experimental values.

Abstract: The development of modern logistics technology and equipment shows the trend of globalization. In order to bring up high-level logistics talents who possess international cooperation in awareness, communication skills, scientific innovation and academic competitiveness, traditional teaching approaches must be reconsidered. Based on the project of bilingual teaching reform of “Advanced Manufacturing Technology”, the paper discusses how to use the student-centered methods, such as case study, problem-based learning (PBL) and project-based teaching to improve teaching quality. In addition, it explores assessment and problems that can be anticipated with these teaching approaches.

Abstract: The design mainly introduces a basic technology of the wastewater tertiary treatment, summarizing the disadvantages and advantages, and designing the process of the feasibility tertiary treatment. This scheme not only is simple, feasible and scaled, but also uesed for houses or a small place. Effluent of high quality is formed.

Abstract: This paper aims to construct analysis model of port urban logistics arrangement using Delphi and analytical hierarchy process method, furthermore, establishment of fuzzy theory and analytical hierarchy process model and factor set. And calculate every index weight with the weighting method--Gl based on differential principle and appraise comprehensive efficiency using fuzzy theory and analytical hierarchy process evaluation method. Using the average weighting method make quantitative disposal with indexes of appraisal factors and educes port urban logistics comprehensive efficiency outcome. And in so doing，validating Shanghai port urban logistics competitiveness actually which respects its efficiency status.

Abstract: The key of 3D measurement technology based on coded structured light for high-accuracy reconstruction of porcelain exhibited on Web, is to ensure measurement accuracy and anti-interference capability on high reflectance surface. So an edge Gray code method for structured light system and related technologies are proposed under interference by high reflectance ratio and color of measured surface. Firstly, encoding and decoding principles by Gray code stripe edge reduce theoretical quantization error and decoding error against traditional Gray code, so measurement accuracy is improved. Secondly, stripe edge sub-pixel location method based on grey curve intersecting points is designed to reduce edge location error caused by diffusion from white stripe to black stripe. Measurement system was established according to mathematic model. Experimental results show that error of measured high reflectance unicolor standard plane is 0.60.8mm, and reconstructed porcelain shape has same visual effect as the real one. Finally, based on Java 3D, interactively exhibiting on Web was explored.

Abstract: Isogeometric Analysis combines the NURBS technology and finite element approaches into a unified framework. Regrettably, the NURBS basis functions don’t interpolate at the control points, which lead to the difficulty for imposing the essential boundary conditions. A new approach inspired by Nitsche’s notion was proposed in order to remedy this issue. The essential boundary constraints are enforced by the consistent penalty terms. It has some notable advantages than the other methods, such as (i) the symmetric and positive definite bilinear formulation when the stiffness matrix is symmetric and the stabilization parameter is large enough; (ii) the well-conditioning coefficient matrix of the linear system. Finally, the numerical experiment was performed to verify the optimal rate of convergence of the present method.

Abstract: Through self-propagation high–temperature synthesis (SHS), SrTiO3 in which Sr2+ had been included was solidified. The actors permitted to the solid dendification were analyzed by experimentation. Optimal process parameters were obtained for preparing SrTiO3 and composites, including 56% of density of preform, 10 MPa of pre-pressure P1, 4 s of pressing time t1; 300 MPa of high pressure P2 and 8 s of dwell time t2 at high pressure period.

Abstract: Sustainability assessment of a river basin is usually performed separately from the planning of land uses within the basin. This work develops a methodology for simultaneously considering environmental, social, and economic sustainability for land use planning in a river basin. Systems thinking, managing for results (MFRs), and the driving force-pressure-state-impact- response (DPSIR) framework are firstly used to develop a management framework and an indicator system, which is integrated into an optimization model to simultaneously maximize the sustainability of the river basin. Moreover, a prototype of integrated management system for sustainability and land use for a river basin (IMSSLU) is established to obtain the optimal strategy. The Shetzu River Basin in Taiwan is used as case study. The sustainability of this river basin can be increased as the land use plan is developed. The optimal land use strategies for the Shetzu River Basin and its land divisions can both be generated. The total quantities of pollution discharges and resource uses of each drainage zone are also obtained. Analytical results indicate that the proposed methodology and IMSSLU system can be used to help the authorities to devise the optimal land use plan for a river basin while simultaneously pursuing its optimal sustainability.

Abstract: The main purpose of this paper is to integrate and apply hydrogen-oxygen fuel cells as the major power system, which is combined with the auxiliary power system of a lead-acid battery in the hybrid fuel cell vehicles, and design and modify vehicle structure and a transmission system in order to improve stability and controllability. Furthermore, this study designs an appropriate power control system to increase vehicle travel time, reduce power consumption, and finally, integrate the hydrogen storage system into the power source of hybrid fuel cell vehicles for the development of energy-saving carbon-free transport vehicles. In general road surface driving tests, a low-pressure metallic hydrogen storage tank under the pressure of 0.5bar is used to provide 10g of hydrogen gas fuel to a 200W hydrogen-oxygen fuel cell stack as the major power source, and the auxiliary power source of two serially connected 12V 1.5Ah lead-acid batteries is used. The total weight of the hybrid hydrogen-oxygen fuel cell power system is 1.3 kg. In the general road surface test of a hybrid hydrogen-oxygen fuel cell vehicle, the average driving speed is 11km/hr, the motor consumption power is 45W, and the travel time is 90 minutes. The hydrogen-oxygen fuel cell vehicle is equipped with a three-stage gear box, and is able to automatically shift to the desired gear. The maximum driving speed can be up to 20km/hr, with motor power consumption of 90W.