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The use of transmission-line networks as periodic structures emulating many interesting metamaterial-related phenomena, such as negative refraction ([1], [2]) and cloaking ([3], [4]), has gained increasing interest in the scientific community. Transmission-line networks offer a simple way to create non-resonant, broadband structures exhibiting exotic wave propagation characteristics. A big drawback...
The engineering degree programs offered by higher education in China are currently undergoing fast development towards internationalization. There have been a number of strategies and methods out of this development process, yet most of them are oriented to importing resources from overseas without taking the existing facilities and constraints into full account. This paper first introduces a graft...
For the series of U-channel section, which has similar structure, it is easy to adjust the geometric model of U-channel section by using parametric design method, the efficiency is improved and the time for product design will be shortened greatly. By using the ANSYS Parametric Design Language (APDL), the FEA process including creating FEA model and analysis steps is discussed with the finite element...
Safety for the occupants of the cab is a prime consideration for structure design on commercial vehicle. The cab shall be designed and attached to the vehicle in such way that in the event of collision exhibit a survival space for the occupants, meanwhile,the cab must remain attached to the chassis frame. The new more legal and strict safety test requirements are specified by proposal for ECE R29-03[1]...
Two dimentional mathematical model of tunnel temperature field in condition of diffusion during seam smoldering steady according to heat transfer theory and comservation of mass, momentum and energy. Temperature character of tunnel in condition of diffusion during seam smoldering steady is simulated by COMSOL Multiphysics according to this model. Results show that temperature field in tunnel can be...
When using shield driven method to construct tunnels, mechanical properties of injecting cement paste will change at curing age. And then ground settlement will also change because of changes of mechanical properties of injecting cement paste. Based on the first line of Ningbo rail transit, this paper will discuss the effect of ground settlement caused by changes of elastic modulus and Poisson's ratio...
The subroutine UEL embedded in commercial FEM software ABAQUS is utilized to develop a user element based on the material of pressure-dependent elasto-plastic cosserat continuum model. The user element adopt plane eight-node isoparametric unit which include three degree of freedom(two translation and one rotation) at each node, the Drucker-Prager material model with associate flow rule is used, the...
A new model hammer mill was developed by Inner Mongolia Agricultural University of China, in which material can be milled circularly and there is no material-circulation-layer effect. In order to improve the working efficiency of the new model hammer mill, the 3-D air-flow field in the mill was numerically simulated and analyzed in computation fluid dynamics (CFD) software Fluent 6.3. Then the simulated...
In this paper, we present the results of an on-going practical study into the development of novel FDTD numerical modelling and linear tomographic inversion methods for the interpretation and analysis of near-surface GPR data. The performance of these methods is evaluated against a simulated test-case example in which GPR data is collected over a realistic buried utility pipe model. The inversion...
A new solar cell simulation program, wxAMPS, is presented in this work. The interface of wxAMPS is developed using a cross-platform library, wxWidgets, and the kernel is based on an updated version of the AMPS (Analysis of Microelectronic and Photonic Structures) code. wxAMPS incorporates two different tunneling models for better simulation of specific types of solar cells. Compared to the drift-diffusion...
Single junction a-Si:H solar cells with various configurations of sub-wavelength features were explored based on the material composition of the nano-elements, the absorber thickness, and the direction of light application. Cell performance and the interplay among photonic, plasmonic, and the absorber thickness effects are shown to vary dramatically depending on the architecture. An example configuration...
The purpose of this paper is to introduce real option theory into supply chain disruption management of strategic material, so as to improve the revenue of supply chain and solve the problems of large capital occupancy and inaccurate demand forecast. Based on real option theory, we model the supply chain of strategic material by some reasonable assumptions. Furthermore, the corresponding real option...
A three-dimensional (3D) thermo-elastic stress model based on the displacement method was developed to study the thermal stress distribution in the solidified silicon ingot in a directional solidification process. The temperature field was obtained from a 3D global simulation of heat transfer in the furnace. A new coupled model was developed to account for the interaction between the silicon ingot...
We develop a new method based on the high-frequency electromagnetic (EM)-semiconductor coupled simulation to analyze the impact of multi-type process variations happen around semi-conductormetal structure. It is competent to simultaneously handle geometrical variations like surface roughness and material variations like semi-conductor doping profile, which are difficult for traditional “stand alone”...
Numerical simulation is used widely in the field of geotechnical engineering, the paper used finite difference software FLAC3D to numerical simulate status of anchorage system, according to setting different material parameters grouting to simulate different defect in the anchor system. Numerical simulation of anchorage system in the case of characteristic frequency and typical vibration loading are...
This paper presents a thermal analysis result for a 3D heterogeneous embedded system integration MorPACK (morphing package) platform. The MorPACK platform is stacked by heterogeneous submodules composed of bare dies, a substrate, connection bridges, and solder balls. Since the tiny, heterogeneous and integrable characteristics of MorPACK platform, it needs to be fabricated in high-density and laminar...
Root system of vegetation can improve slope stability through changing in mechanical and hydrological properties of root-soil matrix. In this paper, the typical models to describe the mechanical effect in soil-root system and some theories of numerical simulation on root reinforcement mechanism are briefly elucidated, Based on the Strength Reduction Method(SRM) and ABAQUS code, a numerical model is...
Large-diameter rock-socketed shafts have been widely used in large-scale bridge constructions due to its higher bearing capacity and less settlement. Difficulties in pore-forming and uncertainty of pile bearing capacity have brought challenges to the construction and design of shafts in karst areas. Based on the engineering geological investigation, only parts of caves can be found in boring, however,...
With the development of the computer technology and the numerical technology, inverse analysis method has been widely applied to identify the mode parameter. The parameter identification methodology mainly includes the selection of the appropriate experimental data, the definition of the objective function and the optimization algorithm. However, little study has been reported on how to define the...
A floating protection system is presented to protect bridge structures from vessel impacts. Based on general contact-impact nonlinear finite element technique, the high resolution models of the 5,000-DWT ship and the protection system are developed to evaluate the performance of the floating protection system under vessel collisions. The results show that the protection system can effectively absorb...
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