3,275 research outputs found
Data for "Identifying a critical micelle temperature in simulations of disordered asymmetric diblock copolymer melts"
No full textWith this data, one can plot all the figures given in the publication "Identifying a critical micelle temperature in simulations of disordered asymmetric diblock copolymer melts". An example simulation file is also given as a reference.We have used coarse-grained molecular dynamics simulations to identify a critical micelle temperature in a diblock copolymer melt by analyzing the appearance of micelles. The files contain the data and an example simulation file which can be used with Hoomd-blue version 2.9.0. The data has been published as "Identifying a critical micelle temperature in simulations of disordered asymmetric diblock copolymer melts" in Physical Review Materials.This work was supported primarily by NSF grant DMR-1719692. Most of the work was carried out using computational resources provided by the Minnesota Supercomputing Institute (MSI) at the University of Minnesota and part of this work used equipment supported by funding from the National Science Foundation through the UMN MRSEC under Award Number DMR-2011401.Chawla, Anshul; Bates, Frank S; Dorfman, Kevin D; Morse, David C. (2021). Data for "Identifying a critical micelle temperature in simulations of disordered asymmetric diblock copolymer melts". Retrieved from the University Digital Conservancy, https://doi.org/10.13020/rhjm-c008
SARAH-CONUS: Sub-weekly Area of Reservoirs from Analysis of Harmonized Landsat and Sentinel-2 data for Continental US
No full textThis dataset provides reservoir water-surface areas every 2–6 days for 1,904 reservoirs (>0.1 km²) across the conterminous United States from 1 January 2016 through 31 December 2023. Areas were extracted from NASA’s Harmonized Landsat–Sentinel-2 Surface Reflectance product (HLS v1.4; 30 m) with a Random-Forest water classifier, a cloud/ice-correction enhancement based on the Global Surface Water Occurrence layer, and LOWESS gap-filling. Validation against daily in-situ surveys for 240 reservoirs yields R² = 0.98 and median bias < 10 %. The product (nick-named SARAH-CONUS) closes the temporal gap between daily MODIS (coarse) and monthly Landsat (fine), enabling analyses of flood-mitigation releases, hydropower peaking, evaporation losses, and greenhouse-gas pulses at a management-relevant cadence
Book Review : Technical Territories: Data, Subjects, and Spaces in Infrastructural Asia, by Luke Munn.
No full textIn Technical Territories: Data, Subjects, and Spaces in Infrastructural Asia, Luke Munn explores how today’s territories are defined through data infrastructures, from undersea cables to cloud storage. Examining several cases studies in Asia, Anshul Rai Sharma finds this a groundbreaking interdisciplinary study of how these infrastructures underpin new forms of governance, shaping subjects and their everyday lives
Development of thermal displays for haptic interfaces
No full textThesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2016.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Cataloged from student-submitted PDF version of thesis.Includes bibliographical references (pages 97-102).This thesis studied the effect of different stimulus parameters on the thermal response of the skin. A set of thermal patterns, known as thermal icons, was presented to participants using a thermal display mounted on the hand. The thermal responses of the skin were studied to understand which features of the thermal stimuli were important and could be perceived by users. The effectiveness of these patterns was evaluated for applications involving hand-held and wearable thermal devices. In the first series of experiments, a set of six thermal icons was developed and presented on the thenar eminence and the fingertips. The second experiment was conducted on the wrist with a revised set of thermal icons which had a shorter duration and were presented relative to each participant's baseline skin temperature. The information transfer (IT) values for the thermal icons presented on the wrist-mounted thermal display demonstrated that the information processing capabilities of the thermal sensory system may rival those achieved with vibrotactile inputs. To date, thermal icon studies have only used the temporal properties of stimuli and not the spatial properties. A set of two experiments was conducted to examine how the spatial and temporal properties of thermal stimuli interact. The results showed that the temporal properties of thermal stimulation can influence the perceived location of a thermal stimulus. This space-time dependency for the thermal sensory system provides an extra dimension to use to present information in a thermal display and potentially could result in a display that functionally has a higher spatial resolution than the number of thermal elements would indicate.by Anshul Singhal.S.M
Collective excitations in layered materials with momentum-resolved electron energy loss spectroscopy
No full textStrong Coulomb interactions are either suspected or known to play a prominent role in material classes such as high temperature superconductors, charge density waves, and Mott insulators among many others. These interactions are quantified by the charge density response function, chi(q,w) (or the closely related inverse dielectric function). The measurement of the energy- and momentum-resolved chi(q,w) over a large phase space of q and w, however, presents a significant experimental challenge. Traditional methods to measure chi(q,w) have suffered from either one or more major drawbacks. To address this problem, the development of a spectroscopic technique, momentum-resolved electron energy loss spectroscopy (M-EELS), was undertaken. Because many of the material classes that exhibit these unusual ground states tend to be layered or quasi-two dimensional, M-EELS presents a promising approach to measuring the energy- and momentum-resolved charge density response. Since the technique is not widely used, however, the M-EELS results obtained as part of this thesis were compared to other probes in the relevant ranges of phase space to ensure consistency. Furthermore, a theoretical framework was worked out to demonstrate explicitly the relationship between the scattering cross section and c(q,w). M-EELS experiments were conducted on a high-temperature superconductor, Bi2Sr2CaCu2O8+d, a charge density wave material, TiSe2, and a topological insulator, Bi2Se3. It was determined that the bosonic origin of quasiparticle kinks often seen in angle-resolved photoemission studies can be identified using M-EELS. Lastly, the observation of a novel electronic collective mode in TiSe2 is presented as strong evidence for an excitonic insulator phase in this compound.Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2017-12-01The student, Anshul Kogar, accepted the attached license on 2015-08-28 at 14:26.The student, Anshul Kogar, submitted this Dissertation for approval on 2015-08-28 at 14:40.This Dissertation was approved for publication on 2015-09-08 at 14:22.DSpace SAF Submission Ingestion Package generated from Vireo submission #8678 on 2016-03-08 at 11:05:02Made available in DSpace on 2016-03-08T17:21:39Z (GMT). No. of bitstreams: 2
KOGAR-DISSERTATION-2015.pdf: 28040750 bytes, checksum: 4f4970009dcd7d4346f4925381c03336 (MD5)
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Android game development with AppInventor
No full textThesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2012.Cataloged from PDF version of thesis.Includes bibliographical references (p. 94).AppInventor is an educational learning tool provided by MIT that allows users to build Android apps without any knowledge of programming. As AppInventor gains popularity amongst educators and students around the world, it will become increasingly important to ensure that the tool offers its users the breadth and depth of app-development functionality they desire. In anticipation of AppInventor's expanding role and influence in educational institutions worldwide (middle schools and high-schools, primarily), this thesis focuses on the age group of 3rd to 12th grade students, and on the topic that is of greatest interest to them: gaming, animation, and graphics. The aim of this thesis is to identify AppInventor's existing capabilities and limitations with respect to game development, and to implement ideas (both pedagogical and technological in nature) that will improve the diversity, complexity, aesthetic appeal, and performance of games that can be built using AppInventor. The author of this thesis believes that if AppInventor's game development capabilities can be augmented, the adoption rate of the tool and its popularity amongst school students will be impacted very positively. In this thesis, the author describes his personal experiences teaching AppInventor game development in India and USA, as well as the limitations (in teaching methodology and in AppInventor's feature set) that he identified through this experience. The author's primary contributions are the development of a hands-on curriculum for a 40-hour AppInventor Game Development course, and the implementation of several new features and components for AppInventor. The author will be traveling to China and India in Summer 2012 to test to what extent his creative curriculum and novel AppInventor modifications facilitate the development of games using AppInventor.by Anshul Bhagi.M.Eng
Interactions between auditory and visual motion mechanisms and the role of attention: psychophysics and quantitative models
No full textThe human brain continuously receives sensory input from the dynamic physical world via various sensory modalities. In many cases, a single physical event generates simultaneous input to more than one modality. For example, a ball hitting the ground generates both visual and auditory input. The human brain has developed mechanisms to take advantage of the correlations between inputs to different modalities to form a uniform and stable percept. Recently, there has been a lot of research interest, psychophysical, neurophysiological and computational, to explore the mechanisms involved in crossmodal interactions in general and auditory-visual interactions in particular.
The current thesis makes three significant contributions to the field of auditory-visual interactions. First, I designed a comprehensive study to psychophysically examine the interactions between auditory and visual motion mechanisms for three different motion configurations: horizontal, vertical and motion-in-depth. I showed that simultaneous presentation of a strong motion signal in one modality influences perception of a weak motion signal in the other modality both when the weak motion in presented in the visual, as well as in the auditory modality. I further observed that crossmodal aftereffects were induced only when subjects adapted to spatial motion in the visual modality and not in the auditory modality. However, adaptation to auditory spectral motion did induce vertical visual motion aftereffects. To my knowledge, this is the first report of auditory-induced visual aftereffects. Second, I conducted psychophysical experiments to study the effects of spectral attention on the visual and the auditory motion mechanisms and showed that there are similar attentional effects on motion mechanisms within the two modalities. Third, I developed a neurophysiologically relevant computational model to provide a possible explanation for crossmodal interactions between the auditory and the visual motion mechanisms. In addition, I developed a model that can explain the observed experimental findings on the role of spectral attention in modulating motion aftereffects. The results obtained from both the model simulations agree very closely with the human behavioral data obtained from the experiments.Ph.D.Includes bibliographical references (p. 139-144)
The Frontal Sinus: Surgical Approaches and Controversies.
No full textDescription based upon print version of record.""This book will be a valuable resource for novice surgeons approaching one of the most challenging anatomical subsites, since it provides a stepwise approach to understanding the anatomical background, the radiological aspects, and the broad spectrum of different surgical approaches to the frontal sinuses.The authors are to be congratulated for this masterpiece, which will become the gold standard for experts and beginners."" --Paolo Castelnuovo Edited by renowned rhinologists and skull base surgeons Christos Georgalas and Anshul Sama, this complete guide to frontal sinus surgery covers surgi.1 online resource (418 p.
Solution of fluid-structure interaction problems using a discontinuous Galerkin technique
No full textThesis (S.M.)--Massachusetts Institute of Technology, Computation for Design and Optimization Program, 2008.Includes bibliographical references (p. 57-58).The present work aims to address the problem of fluid-structure interaction using a discontinuous Galerkin approach. Starting from the Navier-Stokes equations on a fixed domain, an arbitrary Lagrangian Eulerian (ALE) approach is used to derive the equations for the deforming domain. A geometric conservation law (GCL) is then introduced, which guarantees freestream preservation of the numerical scheme. The space discretization is performed using a discontinuous Galerkin method and time integration is performed using either an explicit four stage Runge-Kutta scheme or an implicit BDF2 scheme. The mapping parameters for the ALE formulation are then obtained using algorithms based on radial basis functions (RBF) or linear elasticity. These strategies are robust and can be applied to bodies with arbitrary shapes and undergoing arbitrary motions. The robustness and accuracy of the ALE scheme coupled with these mapping strategies is then demonstrated by solving some model problems. The ability of the scheme to handle complex flow problems is demonstrated by analyzing the low Reynolds number flow over an oscillating circular cylinder.by Anshul Mohnot.S.M
Planted matching problems on random hypergraphs
No full textWe consider the problem of inferring a matching hidden in a weighted random
-hypergraph. We assume that the hyperedges' weights are random and
distributed according to two different densities conditioning on the fact that
they belong to the hidden matching, or not. We show that, for and in the
large graph size limit, an algorithmic first order transition in the signal
strength separates a regime in which a complete recovery of the hidden matching
is feasible from a regime in which partial recovery is possible. This is in
contrast to the case where the transition is known to be continuous.
Finally, we consider the case of graphs presenting a mixture of edges and
-hyperedges, interpolating between the and the cases, and we
study how the transition changes from continuous to first order by tuning the
relative amount of edges and hyperedges.Comment: 13 pages, 12 figure
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