Blum, David, Jorissen, Filip, Huang, Sen, Arroyo, Javier, Benne, Kyle, Li, Yanfei, Gavan, Valentin, Rivalin, Lisa, Helsen, Lieve, Vrabie, Draguna, Wetter, Michael, and Sofos, Marina
Advanced control strategies are becoming increasinglynecessary in buildings in order to meet and balancerequirements for energy efficiency, demand flexibility,and occupant comfort. Additional development andwidespread adoption of emerging control strategies,however, ultimately require low implementation costs toreduce payback period and verified performance to gaincontrol vendor, building owner, and operator trust. Thisis difficult in an already first-cost driven and risk-averseindustry. Recent innovations in building simulation cansignificantly aid in meeting these requirements andspurring innovation at early stages of development byevaluating performance, comparing state-of-the-art tonew strategies, providing installation experience, andtesting controller implementations. This paper presentsthe development of a simulation framework consisting oftest cases and software platform for the testing ofadvanced control strategies (BOPTEST - BuildingOptimization Performance Test). The objectives andrequirements of the framework, components of a test case,and proposed software platform architecture aredescribed, and the framework is demonstrated with aprototype implementation and example test case.
Adaptive Optics for Extremely Large Telescopes 4 – Conference Proceedings, vol 1, iss 1
Active optics, adaptive optics, Giant Magellan Telescope, phasing, and dispersed fringe sensor
The future diffraction-limited performance of the 25.4 meter Giant Magellan Telescope (GMT) will rely on the activeand adaptive wavefront sensing measurements made by the Acquisition, Guiding, and Wavefront Sensor (AGWS)currently being designed by SAO. One subsystem of the AGWS, the phasing camera, will be responsible for measuringthe piston phase difference between the seven GMT primary/secondary segment pairs to 50 nm accuracy with full skycoverage using natural guide stars that are 6-10 arcmin off-axis while the on-axis light is used for science operations.The phasing camera will use a dispersed fringe sensor to measure the phase difference in rectangular subaperturesspanning the gaps between adjacent mirror segments. The large gap between segments (>295 mm, compared to 3 mmfor the Keck telescope) reduces the coherence of light across the subapertures, making this problem particularlychallenging. In support of the AGWS phasing camera technical goals, SAO has undertaken a series of prototypingefforts at the Magellan 6.5 meter Clay telescope to demonstrate the dispersed fringe sensor technology and validateatmospheric models. Our latest on-sky test, completed in December 2015, employs a dual-band (I and J) dispersedfringe sensor. This prototype uses an adaptive optics corrected beam from the Magellan AO adaptive secondary system.The system operates both on-axis and 6 arcmin off-axis from the natural guide star feeding the MagAO wavefrontsensor. This on-sky data will inform the development of the AGWS phasing camera design towards the GMT first light.
Chung, P, Heller, JA, Etemadi, M, Ottoson, PE, Liu, JA, Rand, L, and Roy, S
Journal of Visualized Experiments, iss 88
Biologically inert elastomers such as silicone are favorable materials for medical device fabrication, but forming and curing these elastomers using traditional liquid injection molding processes can be an expensive process due to tooling and equipment costs. As a result, it has traditionally been impractical to use liquid injection molding for low-cost, rapid prototyping applications. We have devised a method for rapid and low-cost production of liquid elastomer injection molded devices that utilizes fused deposition modeling 3D printers for mold design and a modified desiccator as an injection system. Low costs and rapid turnaround time in this technique lower the barrier to iteratively designing and prototyping complex elastomer devices. Furthermore, CAD models developed in this process can be later adapted for metal mold tooling design, enabling an easy transition to a traditional injection molding process. We have used this technique to manufacture intravaginal probes involving complex geometries, as well as overmolding over metal parts, using tools commonly available within an academic research laboratory. However, this technique can be easily adapted to create liquid injection molded devices for many other applications.