Point of view: Te Ruru light festival 2019

Point of View is a perception based installation presented as part of Te Ruru Light Festival 2019. The work consists of a 3 sided box suspended above the viewer. The box is painted white and is projected onto from above the primary viewing point (this prevents the viewer from noticing the projector, but also from blocking the projection). The light-based projection onto the surface of the box creates the illusion that the 3 sided box is actually a 6 sided cube. The viewer is invited to move around the space, observing the cube. Once the viewer walks under or past the suspended cube, they enter the secondary viewpoint in which they see the actual form of the box – a 3 sided/open box. The work talks about how our individual experiences shape the way we see. It raises questions about the difference between reality and perception

Controls on ecosystem respiration of carbon dioxide across a boreal wetland gradient in Interior Alaska

Thesis (M.S.) University of Alaska Fairbanks, 2012Permafrost and organic soil layers are common to most wetlands in interior Alaska, where wetlands have functioned as important long-term soil carbon sinks. Boreal wetlands are diverse in both vegetation and nutrient cycling, ranging from nutrient-poor bogs to nutrient- and vascular-rich fens. The goals of my study were to quantify growing season ecosystem respiration (ER) along a gradient of vegetation and permafrost in a boreal wetland complex, and to evaluate the main abiotic and biotic variables that regulate CO₂ release from boreal soils. Highest ER and root respiration were observed at a sedge/forb community and lowest ER and root respiration were observed at a neighboring rich fen community, even though the two fens had similar estimates of root biomass and vascular green area. Root respiration also contributed approximately 40% to ER at both fens. These results support the conclusion that high soil moisture and low redox potential may be limiting both heterotrophic and autotrophic respiration at the rich fen. This study suggests that interactions among soil environmental variables are important drivers of ER. Also, vegetation and its response to soil environment determines contributions from aboveground (leaves and shoots) and belowground (roots and moss) components, which vary among wetland gradient communities.Introduction -- Introduction to boreal wetlands -- Ecosystem respiration and its role in peatland function -- Brief rationale for this study -- Goals, objectives, and hypotheses -- Methods -- Description of study site and the gradient design -- Atmospheric and soil environmental variables -- Ecosystem respiration fluxes -- Root respiration fluxes and aboveground vegetation measurements -- Results -- Soil environmental variables along the gradient -- Ecosystem respiration -- Contributions of root respiration to ER -- Discussion -- Patterns of ecosystem respiration along the wetland gradient -- The role of roots in ecosystem respiration of CO₂ -- Study limitations and ideas for future research -- Conclusions

DeBruijn Strings, Double Helices, and the Ehrenfeucht-Mycielski Mechanism

We revisit the pseudo-random sequence introduced by Ehrenfeucht and Mycielski and its connections with DeBruijn strings

Film Fabrication Technologies at NREL

The National Renewable Energy Laboratory (NREL) has extensive capabilities for fabricating a variety of high-technology films. Much of the in-house work in NREL's large photovoltaics (PV) program involves the fabrication of multiple thin-film semiconducting layers constituting a thin-film PV device. NREL's smaller program in superconductivity focuses on the fabrication of superconducting films on long, flexible tape substrates. This paper focuses on four of NREL's in-house research groups and their film fabrication techniques, developed for a variety of elements, alloys, and compounds to be deposited on a variety of substrates. As is the case for many national laboratories, NREL's technology transfer efforts are focusing on Cooperative Research and Development Agreements (CRADA's) between NREL researchers and private industry researchers

Method of plating copper on aluminum Patent

Method of plating copper on aluminum to permit conventional soldering of structural aluminum bodie

An overview of solar flare results from COMPTEL

The COMPTEL experiment on the Compton Gamma Ray Observatory (CGRO) has been operating in orbit since April of 1991. During that time, COMPTEL has observed several large flares, the most notable of which were several X‐class flares which took place in June of 1991. As a solar instrument, COMPTEL has the capability to measure solar flare radiation in two parallel observing modes. In its telescope mode, COMPTEL is capable of measuring both solar flare photons (in the 0.75–30 MeV range) and solar flare neutrons (in the 20–150 MeV range) using the double scatter technique with a field‐of‐view of ∼1 steradian. This approach also permits the imaging of the incident solar radiations (both photons and neutrons). The burst mode of COMPTEL utilizes two of the lower D2 detectors as large‐area spectroscopy detectors to provide additional data in the 0.6–10 MeV range. Here we shall review both modes of COMPTEL operation and provide an overview of solar flare results which are presently available