Showing 1761 - 1770 of 2040 Items
Narrative-inspired generation of ambient music
Date: 2017-01-01
Creator: Sarah Harmon
Access: Open access
- An author might read other written works to polish their own writing skill, just as a painter might analyze other paintings to hone their own craft. Yet, either might also visit the theatre, listen to a piece of music, or otherwise experience the world outside their particular discipline in search of creative insight. This paper explores one example of how a computational system might rely on what they have learned from analyzing another distinct form of expression to produce creative work. Specifically, the system presented here extracts semantic meaning from an input text and uses this knowledge to generate ambient music. An independent measures experiment was conducted to provide a preliminary assessment of the system and direct future work.
CrI3 revisited with a many-body ab initio theoretical approach
Date: 2021-06-01
Creator: Tom Ichibha
Allison L. Dzubak
Jaron T. Krogel
Valentino R. Cooper
Fernando A., Reboredo
Access: Open access
- CrI3 has recently been shown to exhibit low-dimensional, long-range magnetic ordering from few layers to single layers of CrI3. The properties of CrI3 bulk and few-layered systems are uniquely defined by a combination of short-range intralayer and long-range interlayer interactions, including strong correlations, exchange, and spin-orbit coupling. Unfortunately, both the long-range van der Waals interactions, which are driven by dynamic, many-body electronic correlations, and the competing strong intralayer correlations, present a formidable challenge for the local or semilocal mean-field approximations employed in workhorse electronic structure approaches like density-functional theory. In this paper we employ a sophisticated many-body approach that can simultaneously describe long- and short-range correlations. We establish that the fixed-node diffusion Monte Carlo (FNDMC) method reproduces the experimental interlayer separation distance of bulk CrI3 for the high-temperature monoclinic phase with a reliable prediction of the interlayer binding energy. We subsequently employed the FNDMC results to benchmark the accuracy of several density-functional theory exchange-correlation approximations.
GREEN-PSO: Conserving function evaluations in Particle Swarm Optimization
Date: 2013-11-18
Creator: Stephen M. Majercik
Access: Open access
- In the Particle Swarm Optimization (PSO) algorithm, the expense of evaluating the objective function can make it difficult, or impossible, to use this approach effectively; reducing the number of necessary function evaluations would make it possible to apply the PSO algorithm more widely. Many function approximation techniques have been developed that address this issue, but an alternative to function approximation is function conservation. We describe GREEN-PSO (GR-PSO), an algorithm that, given a fixed number of function evaluations, conserves those function evaluations by probabilistically choosing a subset of particles smaller than the entire swarm on each iteration and allowing only those particles to perform function evaluations. The "surplus" of function evaluations thus created allows a greater number of particles and/or iterations. In spite of the loss of information resulting from this more parsimonious use of function evaluations, GR-PSO performs as well as, or better than, the standard PSO algorithm on a set of six benchmark functions, both in terms of the rate of error reduction and the quality of the final solution.
Galileo, poetry, and patronage: Iulio strozzi's venetia edificata and the lace of galileo in seventeenth-century talian poetry
Date: 2013-12-01
Creator: Crystal Hall
Access: Open access
- The Venetian poet and librettist Giulio Strozzi (1583 -1652) spent much of his career glorifying he Serenissima through a series of theatrical pieces. His only epic poem, the Venetia edificata (1621, 1624), while ostensibly a celebration of the republic, shows a level of commitment to alileo Galilei (1564 -1643) and to Galileo's science that is unique among poets of the time, enetian or otherwise. It is the apex of Strozzi's artistic project to incorporate Galileo's discoveries nd texts into poetic works. The Venetia edificata also represents the culmination of a fifteen-year ffort to gain patronage from the Medici Grand Dukes in Florence. While the first, incomplete ersion is dedicated to the Venetian Doge, the second, finished version is dedicated to Grand DukeFerdinando II de' Medici of Florence. More than a decade after Galileo's departure from the eneto to Florence, Strozzi cites from Galileo's early works, creates a character inspired by Galileo, ncorporates the principles of Galileo's science into the organizing structure of the poem, and nswers one of Galileo's loudest complaints about Torquato Tasso's Jerusalem Delivered (1581). trozzi's strategies both in writing the Venetia edificata and in seeking patronage for it underscore he ambivalent response to Galileo in contemporary poetry.
Identifying the Opportunity Cost of Critical Habitat Designation under the U.S. Endangered Species Act
Date: 2014-10-01
Creator: Erik Nelson
John C. Withey
Derric Pennington
Joshua J. Lawler
Access: Open access
- We determine the effect of the US Endangered Species Act’s Critical Habitat designation on land use change from 1992 to 2011. We find that the rate of change in developed land (constructed material) and agricultural land is not significantly affected by Critical Habitat designation. Therefore, Sections 7 and 9 of the Endangered Species Act do not appear to be more heavily applied in lands designated as Critical Habitat areas versus lands within listed species’ ranges, but without critical habitat designation. Further, there does not appear to be any extraordinary conservation activity in critical habitat areas; for example, environmental non-profits and land trusts do not appear to be concentrating activity in these areas. Before we conclude that the opportunity cost of Critical Habitat designation is negligible we need to examine the land management impacts of designation.
What some ghosts don't know: Spectral incognizance and the horror film
Date: 2009-01-01
Creator: Aviva Briefel
Access: Open access
Statement gathered at Motahkomikuk-Indian Township, Maine, November 12, 2014
Date: 2014-11-12
Creator: Karen Sabattis
Anonymous
Stephanie Bailey
Jeanie Grant
Molly Socoby
Selina Mitchell-Lola
Katherine Newell
Access: Open access
Statement gathered at Indian Island, Maine, November 17, 2014
Date: 2014-11-17
Creator: Barbara Kates
Stephanie Bailey
Maria Girouard
Arla Patch
Wenona Lola
Esther Attean
Access: Open access
New insights on obtaining phytoplankton concentration and composition from in situ multispectral Chlorophyll fluorescence
Date: 2010-01-01
Creator: Christopher W. Proctor
Collin S. Roesler
Access: Open access
- A three-channel excitation (435 nm, 470 nm, and 532 nm) Chlorophyll fluorometer (695 nm emission) was calibrated and characterized to improve uncertainty in estimated in situ Chlorophyll concentrations. Protocols for reducing sensor-related uncertainties as well as environmental-related uncertainties were developed. Sensor calibrations were performed with thirteen monospecific cultures in the laboratory, grown under limiting and saturating irradiance, and sampled at different growth phases. Resulting uncertainties in the calibration slope induced by natural variations in the in vivo fluorescence per extracted Chlorophyll yield were quantified. Signal variations associated with the sensors (i.e., dark current configurations, drift, and stability) and the environment (i.e., temperature dependent dark currents and contamination by colored dissolved organic matter [CDOM] fluorescence) yielded errors in estimating in situ Chlorophyll concentration exceeding 100%. Calibration protocols and concurrent observations of in situ temperature and CDOM fluorescence eliminate these uncertainties. Depending upon excitation channel, biomass calibration slopes varied between 6-and 10-fold between species and as a function of growth irradiance or growth phase. The largest source of slope variability was due to variations in accessory pigmentation, and thus the variance could be reduced among pigment-based taxonomic lines. Fluorescence ratios were statistically distinct among the pigment-based taxonomic groups, providing not only a means for approximating bulk taxonomic composition, but also for selecting the appropriate calibration slope to statistically improve the accuracy of in situ Chlorophyll concentration estimates. Application to 5 months of deployment in China Lake, Maine, USA reduced the error in estimating extracted Chlorophyll concentration from > 30% to < 6%. © 2010, by the American Society of Limnology and Oceanography, Inc.
Identification, physiological actions, and distribution of TPSGFLGMRamide: A novel tachykinin-related peptide from the midgut and stomatogastric nervous system of Cancer crabs
Date: 2007-06-01
Creator: Elizabeth A. Stemmler
Braulio Peguero
Emily A. Bruns
Patsy S. Dickinson
Andrew E., Christie
Access: Open access
- In most invertebrates, multiple species-specific isoforms of tachykinin-related peptide (TRP) are common. In contrast, only a single conserved TRP isoform, APSGFLGMRamide, has been documented in decapod crustaceans, leading to the hypothesis that it is the sole TRP present in this arthropod order. Previous studies of crustacean TRPs have focused on neuronal tissue, but the recent demonstration of TRPs in midgut epithelial cells in Cancer species led us to question whether other TRPs are present in the gut, as is the case in insects. Using direct tissue matrix assisted laser desorption/ionization Fourier transform mass spectrometry, in combination with sustained off-resonance irradiation collision-induced dissociation, we found that at least one additional TRP is present in Cancer irroratus, Cancer borealis, Cancer magister, and Cancer productus. The novel TRP isoform, TPSGFLGMRamide, was present not only in the midgut, but also in the stomatogastric nervous system (STNS). In addition, we identified an unprocessed TRP precursor APSGFLGMRG, which was detected in midgut tissues only. TRP immunohistochemistry, in combination with preadsorption studies, suggests that APSGFLGMRamide and TPSGFLGMRamide are co-localized in the stomatogastric ganglion (STG), which is contained within the STNS. Exogenous application of TPSGFLGMRamide to the STG elicited a pyloric motor pattern that was identical to that elicited by APSGFLGMRamide, whereas APSGFLGMRG did not alter the pyloric motor pattern. © 2007 The Authors.