The digitalization of the product design process has become new norm in engineering with development different CAD software, analyses tools, and rapid prototyping techniques. More holistic approaches include modeling manufacturing technologies entire logistics regarding life-cycle. Advanced techniques have paved way for engineers designers to create innovative products unique functionalities or...

Abstract Multi-scale structures, as found in nature (e.g., bone and bamboo), hold the promise of achieving superior performance while being intrinsically lightweight, robust, multi-functional. Recent years have seen a rapid development topology optimization approaches for designing multi-scale but field actually dates back to seminal paper by Bendsøe Kikuchi from 1988 (Computer Methods Applied ...

Abstract. The parsec-scale total intensity structures of BL Lac objects share many characteristics with quasars: e.g. well-collimated jets and superluminal motion. However, the jets of BL Lac objects appear to fade much more quickly than those in quasars and on VLA scales many BL Lacs have structures comparable to those of low luminosity (FR I) radio galaxies, in which kpc-scale flow speeds are...

We demonstrate that to all large scale cosmological structures where gravitation is the only overall relevant interaction assembling the system (e.g. galaxies), there is associated a characteristic unit of action per particle whose order of magnitude coincides with the Planck action constant h. This result extends the class of physical systems for which quantum coherence can act on macroscopic ...

Active structures capable of responding to external stimulii represent the emerging frontier in structural design. Robust and real-time sensing, control, and actuation pose fundamental challenges that must be addressed in this context. As part of an ambitious project funded by the National Science Foundation, researchers at Purdue, Rice, Florida State, and the Catholic (Belgium) Universities ha...

The evidence for large-scale structure at high redshifts is reviewed. I conclude that massive Mpc scale galaxy clusters probably exist at z > 2. The 2139?4430 galaxy cluster at redshift 2.38 is discussed as a case study. This remarkable cluster may consist of 10 Ly-emitting galaxies, and as many as 100 other, less active galaxies, selected by a novel near-IR photometric technique. Most of these...

carbon nanotubes (cnts) are specific structures with valuable characteristics. in general, the structure of each nanotube is defined by a unique chiral vector. in this paper, different structures of short single-walled cnts are simulated and their mechanical properties are determined using finite element method. for this aim, a simple algorithm is presented which is able to model the geometry o...