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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...
Perovskite materials are crucial in a variety of important technological applications. Using quantum-mechanical simulations and accurate molecular dynamics models, we have computationally investigated ferroelectric materials for applications in computer memory, piezoelectrics and photovoltaics. By tuning the applied electric pulses' shaping and delay separation, we find the lower limit for tetragonal...
1,1-diamino-2,2-dinitroethylene (Fox-7) has proven to be a promising energetic material due to its low shock sensitivity and high thermal stability, and has been the subject of several Department of Defense (DoD) theoretical investigations employing Hartree-Fock and density functional theory. However, it is well-known that many energetic crystals have a significant binding contribution resulting from...
There is no field and track event like pole vaulting which sets free the pole's properties to enable a vaulter to yield great jumping performance. The best choice of a pole should convert the total vaulter's take-off kinetic energy to the potential energy. However, this needs perfect matching with the dynamics. Studying non-causal dynamics of a vaulting model enables one to start from the desired...
In this paper, we describe the design of a deformable robot with a tensegrity structure that can crawl and we show the results of experiments showing the ability of these robots to crawl. We first describe a tensegrity structure, composed of struts and cables, and its characteristics. We next explain the principle of crawling by robot body deformation, followed by a classification of the methods by...
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...
We introduce a model of self-organizing systems inspired by biological and Physics metaphors. The motivation for the development of this model is twofold,it enables us to identify critical properties of a system and to understand the important metrics characterizing its qualitative and the quantitative behavior. It also enables us to develop a methodology to investigate these systems and to carry...
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