Hot-Box measurements of highly insulated wall, roof and floor structures

Linköping University Post Print Improved hot-wall MOCVD growth of highly uniform AlGaN/GaN/HEMT structures

The inherent advantages of the hot-wall metal organic chemical vapor deposition (MOCVD reactor (low temperature gradients, less bowing of the wafer during growth, efficient precursor cracking) compared to a cold-wall reactor make it easier to obtain uniform growth. However, arcing may occur in the growth chamber during growth, which deteriorates the properties of the grown material. By insertin...

Free-convection Flow through a Two-dimensional Box with Openings on opposite Walls

Free-convection flow through a two-dimensional rectangular box having openings at opposite corners on the vertical walls is investigated numerically, using a commercial Computational Fluid Dynamics (CFD) software package. Convection is induced when the box's ceiling or its floor is imposed with a temperature that is different to that of the ambient fluid, while all other walls are insulated. Th...

Retractable roof structures

j This paper presents a new concept for retractable roof structures. The new structures consist of a foldable lattice of beams connected by cylindrical joints, to which covering panels or membranes are attached. These structures fold towards their perimeter and there is practically no limit to their shape. Solutions to the key problems that have to be solved in the course of the kinematic desig...

Floor and Roof Function Analogs of the Bell Numbers

Define {f(n)}n=1, the floor sequence, by the linear recurrence f(n + 1) = n ∑ k=1 ⌊n k ⌋ f(k), f(1) = 1. Similarly, define {g(n)}n=1, the roof sequence, by the linear recurrence g(n + 1) = n ∑ k=1 ⌈n k ⌉ g(k), g(1) = 1. This paper studies various properties of these two sequences, including prime criteria, asymptotic approximations of { f(n+1) f(n) }∞ n=1 and { g(n+1) g(n) }∞ n=1 , and the iter...

Cat on a hot tin roof…