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It was demonstrated numerical method optimizing the design of butt-end cathode-heating units with multy — layer the contact filament by methods of the theory thin layer.
In this paper, the interfacial nanoscale bondability between copper (Cu) and Aluminum (Al) intermetallic compound (IMC) for Cu wirebonding has been carefully investigated. Preliminary results demonstrated that IMC cracks from the edge of bonding interface and spreads into the center area. This is the cause of open fail. The IMC between Cu and Al was initially generated in the form of CuAl2, and gradually...
The edge stresses, which are responsible for all physical properties of nanoribbons, always involve two sided non-equivalent edge effects for zigzag honeycomb nanoribbons of two dimensional binary compounds such as BN and MoS2. In present work, we develop an approach to determine the edge stresses of individual non-equivalent zigzag edges. For prototypical system of BN zigzag nanoribbon, the edge...
A method to generate an appropriate path for manipulation of a belt object is proposed. It is important for automatic manipulation of a belt object such as a film/flexible circuit board to generate an appropriate path for a manipulator because such object is flexible in a certain direction but fragile in another direction and an inappropriate path which causes deformation in the fragile direction...
A theoretical model on the elastic stress transfer with friction at the deboned interface in anchor pull-out under plane strain condition was established by introducing stress equilibrium equations, boundary and continuity conditions. Based on the minimum complementary energy principle, bond stress through interface between anchor and matrix was first derived, and all stress solutions in the anchor...
A differential geometry based modeling of a belt object to represent its deformation path is proposed. Adequate deformation path of a belt object such as film circuit boards or flexible circuit boards must be generated for automatic manipulation and assembly. First, deformation of a belt object is described using the curvature of its central axis, torsion around the central axis and the curvature...
According to energy conservation from the destruction of rock catastrophe, a new calculation method of the length of fracture propagation in hydraulic fracturing is proposed, and assuming the crack extends to approximate ellipse, the width calculation model of fracture extension is established. By using this new method in Changsheng well of Jilin oilfield, And the maximum error between the productivity...
Novel designs of an array of piezoelectric stack actuators using a unique buckling mechanism are presented in this paper. Multiple PZT actuator units with high gain displacement amplification mechanisms are arranged in parallel with spatial phase differences. Having an inherent kinematic singularity, the buckling mechanism provides not only an extremely high gain of displacement amplification, but...
Buckling is a highly nonlinear and singular phenomenon in thin beams, and is usually an undesired characteristic that must be prevented from occurring in engineered systems. Buckling, however, can be a useful mechanism for gaining extremely large displacement amplification, since a tiny displacement in the axial direction of the beam may lead to a large defection in the middle of the beam. This paper...
In this paper we develop a mathematical model of the dynamics for an inflatable space reflector, which can be used to design a controller for the shape of the inflatable structure. Inflatable structures have very nice properties, suitable for aerospace applications. We can construct e.g. a huge light weight reflector for a satellite which consumes very little space in the rocket because it can be...
The pull-in problem of fixed-fixed beam structures cannot be solved analytically due to its nonlinear from the large deflection and the electrostatic driving force. So to understanding the characters of the devices, the designers have to resort to numerical techniques. Lack of an accurate model for predicting pull-in voltage for basic micromachined beam structures necessitates the clear need for a...
A conventional flat silicon diaphragm does not perform well in a low pressure range sensor that requires high output and high accuracy because the large deflection of diaphragm causes severe nonlinearity when the diaphragm thickness is small for high output. This phenominon is known as the balloon effect. In order to solve this problem, an improved structure with two bulk masses on the back of a square...
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