Tunable Near-Field Radiative Heat Transfer Exceeding Blackbody Limit with Vanadium Dioxide Thin Film
This paper investigates near-field thermal radiation as the primary source of heat transfer between two parallel surfaces. This radiation takes place extremely close to the heated surfaces in study so the experimental set-up to be used will be done at the nanometer scale. The primary theory being investigated is that near-field radiation generates greater heat flux that conventional radiation governed by Planck’s law with maximum for blackbodies. Working with a phase shift material such as VO2 enables a switch-like effect to occur where the total amount of heat flux fluctuates as VO2 transitions from a metal to an insulator. In this paper, the theoretical heat flux and near-field radiation effect are modeled for a set-up of VO2 and SiO2 layers separated by different vacuum gaps. In addition, a physical experimental set-up is validated for future near-field radiation experiments.
You’ve probably heard a lot of “futurists” talk about data, but it’s not always clear how data relate to our day to day work in libraries.
Why are data important, and what’s the big deal? Data are not just spreadsheets and numbers, but come in many different shapes, colors, and flavors! In this presentation, we will give an introduction to data, talk about why it is relevant, and demonstrate how to and use data in practical situations. We will also provide innovative examples that will inspire you to connect with your colleagues and patrons!
The Arizona State University Libraries’ fun Library Minute video series brings information about resource and services to a large student body. For the first time, we present a workshop walking through the entire production process from start to finish and offering suggestions on how to fit multimedia into your marketing and outreach strategy. In this session, we will produce a short video with participants in three steps:
1. Conceptualization and Planning.
2. Recording.
3. Editing and Distribution.
Digital Production Manger Matthew Harp will demonstrate the tools and process and elaborate on the use of social media, YouTube, and the Internet Archive in the distribution plan. Together with Mimmo Bonanni and Library Minute Host Anali Perry, we’ll share our tips and tricks for video production using whatever resources are available.
Presented at the 2011 Arizona Library Association Conference 2011 - Tucson, Arizona
With technology changing how documents (of all types and format) are created, shared, and used, library personnel make interpretations of copyright law daily. Very little research has been done on how library personnel understand copyright law and their role in interpreting it as part of their daily work, how comfortable they are with this task, what types of training they have received, or what types of training they believe they need.
To help fill this gap, librarians from California State University Chico, Portland Community College, and Arizona State University received a planning grant from the Institute of Museum and Library Services to conduct a survey on copyright education in the 13 states in the Western United States. Unlike previous related studies, we sought responses from all types of libraries, library workers, and especially traditionally underrepresented groups.
With the hypothesis that libraries in the Western U.S. have unique barriers to quality copyright education, we conducted a survey and focus groups with library personnel regarding their prior copyright education; the need for additional education; and what barriers they face in accessing that education.
This is our final report as submitted to IMLS, planning grant log number RE-246437-OLS-20
In this thesis, aluminum metasurface structures are proposed based on colloidal lithography method. High Frequency Structure Simulator is used to numerically study optical properties and design the aluminum metasurfaces with selective absorption. Simulation results show that proposed aluminum metasurface structure on aluminum oxide thin film and aluminum substrate has a major reflectance dip, whose wavelength is tunable within the near-infrared and visible spectrum with metasurface size. As the metasurface is opaque due to aluminum film, it indicates strong wavelength-selective optical absorption, which is due to the magnetic resonance between the top metasurface and bottom Al film within the aluminum oxide layer.
The proposed sample is fabricated based on colloidal lithography method. Monolayer polystyrene particles of 500 nm are successfully prepared and transferred onto silicon substrate. Scanning electron microscope is used to check the surface topography. Aluminum thin film with 20-nm or 50-nm thickness is then deposited on the sample. After monolayer particles are removed, optical properties of samples are measured by micro-scale optical reflectance and transmittance microscope. Measured and simulated reflectance of these samples do not have frequency selective properties and is not sensitive to defects. The next step is to fabricate the Al metasurface on Al_2 O_3 and Al films to experimentally demonstrate the selective absorption predicted from the numerical simulation.
‘Describing at Large Their True and Lively Figure, their several Names, Conditions, Kinds, Virtues (both Natural and Fanciful), Countries of their Species, their Love and Hatred to Humankind, and the wonderful work of Natural Selection in their Evolution, Preservation, and Destruction.
Interwoven with curious variety of Creative Narrations out of Academic Literatures, Scholars, Artists, Scientists, and Poets. Illustrated with diverse Graphics and Emblems both pleasant and profitable for Students of all Faculties and Professions.’