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The electronic properties of pristine and B doped triangular graphene sheets have been investigated by using density functional theory calculations. After doping B atom, most of C-C bonds increase and also increase HOMO-LUMO energy gap. The effects of doping on the Milliken charges and molecular distribution have been studied as well.
In order to forecast the using life of the cemented carbide cutting tool on no damage, the easy detecting physical parameter has been found in this paper. The analysis and the test about the relationship between the wear and the thermoelectric potential of YT14 cemented carbide inserts have been finished in this paper. The influence rules and the influence extent of thermoelectric potential to the...
Nanostructured materials, such as those enhanced with carbon nanotube (CNT) arrays, offer great promise for use as wicks in heat pipes and other passive phase-change cooling applications. While such nanostructures feature very small pore sizes which support high capillary pressures, it is shown that the low permeability of these dense arrays prevents their use as the sole fluid transport mechanism...
The potential application of polymer/ceramic capacitors at a higher frequency range is explored through a detailed characterization of several form factors of embedded capacitors. S-parameters of embedded decoupling capacitors using two different types of embedded capacitance material were measured from 500 MHz to 12 GHz. The effect of different geometries, electrode sizes, and materials are demonstrated...
This paper deals with the experimental investigation on a new insulation material called syntactic foam. Syntactic foam consists of hollow glass or plastic microspheres casted into a polymeric matrix material in order to obtain a foam-like structure. The investigations carried out focus on the dependency between breakdown field strength and the volume of the stressed material under dc field stress...
The majority of soft pads for robotic limbs studied so far were made by visco-elastic polymeric solids whose behavior is significantly influenced by the rate of application of the external loads or displacements. In particular, contact interfaces which are intrinsically visco-elastic are found, for instance, in human fingers and feet or in various robotic devices covered by a compliant surface. An...
This paper presents the principle of bushing shield size, position and its covering material determination, based on the optimization algorithm. An optimization procedure has been carried out using a differential evolution (DE) algorithm combined with a solver of the software tool EleFAnT, which is used for solving computationally expensive parametrically-written bushing FEM model. The goal of this...
This paper presents a method for catadioptric line matching across multiple images. While most of previous works deals with vertical lines and planar motion, our approach is able to match any kind of lines between two views separated by a rigid transformation without any prior knowledge of the epipolar geometry. Catadioptric lines are represented by their normals in sphere space and we use only these...
This paper introduce some technology about using VRML to construct 3D virtual scene and its interactive roaming by Virtual classroom environment's researching and practice. This paper introduces the virtual classroom development process, and elaborates the key technologies of virtual classroom's geometry modeling, texture mapping, interactive behavior design and so on, and discusses how to reduce...
The thermoelectric potential is the one of the major physical properties of material, and it is easy to be measured without damaging the material. The analysis and the test about the relationship between the wear and the thermoelectric potential of YT30 cemented carbide inserts have been finished in this paper. The influence rules and the influence extent of thermoelectric potential to the wear have...
Asymptotic analysis of antenna on complex and electrically large geometries is commonly used to predict installed antenna patterns on satellites, space platforms, ships, planes and other electrically large vehicles or to predict antenna performance in urban environments. SATSim is an advanced implementation of the Astigmatic Beam Tracer (ABT) technique dedicated to the accurate and fast numerical...
Nonlinear static FE analysis of bellows is carried with considering nonlinear of contact, geometry and material. These results show that the contact caused by high internal pressure can improve load bearing ability of structure, and this analysis method is useful to optimization design of bellows.
In order to study the influence of the geometric figure on the service life of the converter, four different geometric figures of the converters were analyzed by using finite element method in this paper. Refractory material behavior was described by Drucker-Prager plasticity model combined with strain softening material behavior at tension, and most of the material physical parameters changing with...
This paper analyzes design routines for their suitability in the design of tunable capacitances (varactors) based on the Barium-Strontium-Titanate (BST) thick-film technology, concerning their static and dynamic description of the component's properties. After a short introduction of the thickfilm process the design rules for planar varactors are discussed in detail. Especially, a guideline for maximizing...
Cutting tool selection is a very important subtask involved in process planning activities. This fact is ascribable to the large number of and to the wide variety of considerations that are involved in this domain. Today an extensive variety of tool geometries is available to suit different cutting situations and needs. Most of the process planners work with voluminous machining data handbooks for...
This paper presents a CAD system, termed as HO-CAD, for heterogeneous object modeling based on ACIS and HOOPS. The HO-CAD system is composed of four modules which are used for creation, representation and visualization of geometry and material composition information, respectively. In the process of the software designing and programming, such considerations as interactivity, open ability, integrating...
We present an image-based method for relighting a scene by analytically fitting a cosine lobe to the reflectance function at each pixel, based on gradient illumination photographs. Realistic relighting results for many materials are obtained using a single per-pixel cosine lobe obtained from just two color photographs: one under uniform white illumination and the other under colored gradient illumination...
Fuzzy synthetic evaluation is an effective decision-making method in the comprehensive evaluation of things affected by multiple factors. During the evaluation, the evaluation results are expressed in the fuzzy sets, but not denoted in the positive or negative manner absolutely. When evaluating the stamping performance, die engineers generally used some descriptions as ??good forming performance??,...
Cosima is the Geant4-based simulator of the medium-energy gamma-ray astronomy library MEGAlib. Within the MEGAlib framework, Cosima is designed to be a simple, fool-proof interface to Geant4 and to enable the simulation of most of the measurement scenarios encountered by X-ray and gamma-ray detectors in space and on Earth.
A semielliptical trench flush-mounted under a metal plane and filled with double-negative (DNG) metamaterial is considered. The primary field is an electric line source parallel to the trench and located inside the trench or in the half-space above it. The two-dimensional boundary-value problem is solved exactly in terms of infinite series of elliptic-cylinder wavefunctions. In particular, the far...
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