1,572 research outputs found
Polymer multimode waveguide optical and electronic PCB manufacturing
No full textThe paper describes the research in the £1.3 million IeMRC Integrated Optical and Electronic Interconnect PCB Manufacturing (OPCB) Flagship Project in which 8 companies and 3 universities carry out collaborative research and which was formed and is technically led by the author. The consortium’s research is aimed at investigating a range of fabrication techniques, some established and some novel, for fabricating polymer multimode waveguides from several polymers, some formulations of which are being developed within the project. The challenge is to develop low cost waveguide manufacturing techniques compatible with commercial PCB manufacturing and to reduce their alignment cost. The project aims to take the first steps in making this hybrid optical waveguide and electrical copper track printed circuit board disruptive technology widely available by establishing and incorporating waveguide design rules into commercial PCB layout software and transferring the technology for fabricating such boards to a commercial PCB manufacturer. To focus the research the project is designing an optical waveguide backplane to tight realistic constraints, using commercial layout software with the new optical design rules, for a demonstrator into which 4 daughter cards are plugged, each carrying an aggregate of 80 Gb/s data so that each waveguide carries 10 Gb/s
Rising Seas: Representations of Antarctica, Climate Change, and Sea Level Rise in U.S. Newspaper Coverage
No full textData are stored in separate .csv/Excel files. All information identifying the coders of this data has been removed.A changing Antarctica carries large implications for global climate systems and sea level rise. However, how climate change is altering Antarctica and how these changes and their relevance are communicated in news media remains unclear. This study explores how Antarctica, climate change, and sea level rise are reported in news media by conducting a content analysis of Antarctic climate coverage in seven U.S. newspapers between March 2007 and December 2022. Findings suggest that newspaper reporting of Antarctica’s changing climate is limited, and that framed coverage about Antarctica, climate change, and sea level rise primarily emphasizes scientific and ecological implications.
Data used to conduct this study include:
1) A spreadsheet detailing article metadata for the 987 texts analyzed in this study. Details include the headline, outlet, author, data of publication, and ID number assigned to each article.
2) A spreadsheet containing the results of a content analysis of the 987 texts examined in this study. Analytical reliability was statistically assessed using a two-person inter-coder reliability process.Bruns, C.J.; Huffman, D.R.; Neff, P.D.; Timm, K.M.F.; Roop, H.A.. (2024). Rising Seas: Representations of Antarctica, Climate Change, and Sea Level Rise in U.S. Newspaper Coverage. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/265195
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High-resolution Fourier transform infrared spectroscopy of high-temperature molecules and free radicals.
No full textHigh resolution absorption spectra of the IF molecule in the X¹Σ⁺ ground state were observed with the Kitt Peak Fourier transform spectrometer in a F₂/I₂ flame. Iodine fluoride is the most unstable interhalogen compound. Accurate wavenumber measurements (±0.0002 cm⁻¹) were made for the 1-0, 2-1 and 2-0 bands and molecular constants were derived. The observation of a high resolution emission spectrum at 13 μm (750 cm⁻¹) is unusual. Seven bands (1-0 through 7-6) of the main isotopic form, ²⁸Si³²S, were observed along with three bands (1-0, 2-1 and 3-2) for each of the minor species, ²⁹Si³²S, ³⁰Si³²S and ²⁸Si³⁴S. More than 2450 lines were fitted for this important astrophysical molecule. Dunham coefficients were obtained for each isotopomer of SiS. Mass-reduced Dunham parameters, including Watson's correction due to the breakdown of the Born-Oppenheimer approximation, were also derived from the data. The first high resolution spectrum of a metal dihalides was recorded by infrared emission spectroscopy. The infrared emission spectrum of BeF₂ was observed in the region of the antisymmetric stretching mode, ν₃, and the combination band, ν₁ + ν₂. Eight vibration-rotation bands were rotationally analyzed and the spectroscopic constants are reported. The equilibrium beryllium fluoride bond distance (rₑ) was found to be 1.3729710(95)Å in BeF₂. Values of the vibrational frequencies of all the three normal modes were obtained from the spectra. The gas phase infrared spectrum of C₆₀ (buckminsterfullerine) has been observed in emission with the National Solar Observatory Fourier transform spectrometer at Kitt Peak. Bands attributable to the C₆₀ molecule are found at 527.1 cm⁻¹, 570.3 cm⁻¹, 1169.1 cm⁻¹ and 1406.9 cm⁻¹. Additional emission features are tentatively assigned to C₇₀ or combination bands of C₆₀. A new, strong emission is observed at 1010.2 cm⁻¹ belonging to an unknown molecule. A new electronic state of ³Π symmetry of PtO has been observed between 7100 cm⁻¹ and 8015 cm⁻¹ above the ground state. This new state was observed through an electronic transition to the ³Σ⁻ ground state of this free radical. Three independent electronic systems connecting the Ω = 0,1 and 2 spin components in the upper state to Ω = 1 component in the ground state have been recorded in emission with the Fourier transform spectrometer associated with the McMath Solar Telescope at Kitt Peak. (Abstract shortened with permission of author.)This item was digitized from a paper original and/or a microfilm copy. If you need
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The Chance and Probability Concepts Project
No full textThis article, created by D.R. Green, describes an investigation of what concepts and intuitions concerning random processes are present in the minds of children of varying abilities across the 11-16 age range. The ability to list permutations, combinations and arrangements is also being investigated. The author states, "Over the past two decades the topic of 'Probabilityâ has been brought into the mathematics curriculum but it may be that this is more an empty gesture rather than a sound strategy." This article can help to alleviate many of the struggles in teaching probability concepts. The article is pitched at a more elementary audience, but is still a perfect resource for almost anyone teaching in the field
Achieving 10 ps coincidence time resolution in TOF-PET is an impossible dream
No full textGreen Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.RST/Radiation, Science and TechnologyRST/Medical Physics & Technolog
Bepalen van het massatraagheidsmoment met behulp van een bifilar pendulum: Determining the moments of inertia using a bifilar pendulum
No full textThe aim of this thesis is to investigate the use of a bifilar pendulum for determining the moments of inertia of the TU Delft solar boat and to quantitatively predict the estimates. In the first part, several methods are discussed which can be applied in deriving the equations of motion of the pendulum. A new method, Kane's method, will be introduced. In the second part, this method will be used to derive the actual equations of motion. These equations are linearized around of the the pendulum's stationary positions to obtain expressions which link the moment of inertia about an axis to the period of oscillation of the pendulum about that axis. These equations are subsequently applied to the solar boat to derive estimates for the moments of inertia about the principle axis of the boat. The results of this thesis considers three different configurations of the bifilar pendulum with the solar boat suspended. One of these configurations results in the most accurate estimates for the moments of inertia, however, these have not been quantitatively predicted. The author suggests a modification in the definition of the bifilar pendulum such that this might be possible.Electrical Engineering, Mathematics and Computer ScienceNumerical analysi
FHA/VA Financing and Price Discounts
No full textThis study examines the effects of FHA and VA mortgage financing on home prices. FHA and VA borrowers receive higher loan-to-value ratios (LVRs) and payment to income (PTIs) ratios relative to conventional underwriting standards. These more lenient standards are offset by the payment of additional financing costs in the form of default insurance premiums and origination fees. The hypothesis for this study is that the origination fees (in the form of insurance premiums and the funding fees) associated with FHA and VA financing will (1) be capitalized into buyer reservation values and (2) result in price discounts relative to conventional loans with lower LVRs. Using a database of nearly 9,000 homes sales in the San Antonio, TX area, we perform hedonic analyses that indicate that both types of government backed financing are associated with reductions in selling prices. The results of this study may imply a cost shifting behavior on the part of buyers and an implicit subsidy on the part of sellers. Our preferred regressions find that the price discounts for FHA underwriting are about 4% (3.81% to 4.14%) relative to conventional financing. VA discounts, as expected, are smaller, ranging from about 2% to 3.46%. Given the prior literature, we hypothesize that the results are likely a result of the fact that FHA and VA homebuyers are able to shift some costs to sellers.
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