A decision maker faces a new theory of how certain events unfold over time. The theory matters for choices she needs to make, but possibly the theory is a fabrication. We show that there is a test which is guaranteed to pass a true theory, and which is also conservative: A false theory will only pass when adopting it over the decision maker’s initial theory would not cause substantial harm; if ...

Solid Freeform Fabrication (SFF), also referred to as Layered manufacturing (LM), is a new method of fabrication. Unlike conventional manufacturing (e.g., CNC machining), where a part is fabricated by selectively removing material from a workpiece, in SFF, a part is built by depositing material, layer-by-layer, under computer control. Solid Freeform Fabrication is in principle a 2.5D process st...

in recent years, utilization of chitosan /tripolyphosphate nanoparticles has been considered greatly as protein delivery vehicles. effects of a variety of factors on final characteristics of nanoparticles have been studied by many investigators. although, the objective of this study was to achieve smaller chitosan nano carriers via changing fabrication parameters such as ph and temperature and ...

Biological methods of nanoparticles synthesis are ecologically sound and sustainable alternative to the conventional methods. On the basis of aforesaid premise, the present study deals with the optimization and fabrication of gold nanoparticles (Au-NPs) using easily available bio-resource, Delonix regia leaf extract. The use of practically nontoxic natural extracts and water allows the synthesi...

Solid freeform fabrication (SFF) allows 3D-printing of arbitrarily shaped structures, directly from computer-aided design (CAD) data. SFF has traditionally focused on printing passive mechanical parts. Advances in this technology and developments in materials science make it feasible to begin the development of a single, compact, robotic SFF system – including a small set of materials which can...

Objects and systems in nature are models for the practice of sustainable design and fabrication. From trees to bones, natural systems are characterized by the constant interplay of creation, environmental response, and analysis of current structural constituents, as part of a larger dynamic system. In contrast, traditional methods of digital design and fabrication are characterized by a linear ...

The paradigm shift of digital fabrication encourages architects to incorporate the knowledge of using innovative materials and novel tools to solve problems in design and construction. However, the application of digital fabrication still needs more flexibility that allows different groups in a society to redesign fabrication processes based on their own needs and values. Looking at robotic fac...

This paper concerns performance modeling of semiconductor manufacturing operations. More specifically, it focuses on queueing network models for an analysis of wafer fabrication facilities. The congestion problems that plague wafer fabrication facilities are described in general terms, and several years' operating data from one particular facility are summarized. A simple queueing network model...