89 research outputs found
Balancing the sustainable component of ethylene-vinyl acetate for achieved better compatibility improvement of wax-based warm mix additives in bitumen
No full textThe ethylene-vinyl acetate (EVA) polymers are always doped into waxy bitumen to inhibit network of wax crystals in bitumen. However, the compatibility improvement behaviors between wax-based warm mix (WWM) additives and bitumen by EVA are not clear, and the sustainable components of EVA for corresponding WWM additives to achieve better compatibility improvement are also not determined. This paper investigated compatibility improvement behaviors between commonly used WWM additives and bitumen after the addition of EVA to obtain sustainable components of EVA through experimental method of activation energy of viscous flow (AEVF) and density function theory-molecular dynamic (DFT-MD) calculations. The results show that the repulsions between the end of main-chain with highest electronegativity in WWM additives and polar molecules of EVA can alleviate the aggregation behaviors of WWM additives and EVA displays the best and worst compatibility improvements for additives with shortest and longest carbon chains, respectively. The dispersed asphaltenes combined with EVA can form the composite wax inhibitors (WIs) systems to increase diffusion coefficient and reduce percentage increment values of cohesive energy density (CED) to further disrupt ordered degree of WWM additives. On this basis, the sustainable carbon numbers of main-chain for EVA that are slightly less than average carbon numbers of WWM additives will help to better improve the compatibility of WWM additives. This investigation can provide the inspiration on how to choose the sustainable components of EVA to achieve high-efficiency compatibility improvement for corresponding warm mix asphalts (WMAs) with different average carbon numbers.Pavement Engineerin
Calculations of energy loss and multiple scattering (ELMS) in molecular hydrogen
No full textTo show that the principle of ionization cooling will work for muon beams we must be able to simulate energy loss and scattering in media reliably. We have three choices: we can use traditional calculations with their uncertainties; we can make measurements (MUSCAT) or, we can calculate the phenomena more carefully, looking afresh at the phenomena from first principles. In this paper we report on work following this third approach. We derive the double differential cross section for a collision with transverse momentum transfer P-t and longitudinal momentum transfer P-l from a knowledge of the UV and x-ray photoabsorption cross section of the medium, together with the known kinematics and dynamics of the scattering of point charges with screening. Distributions in energy loss and scattering may then be found by Monte Carlo techniques which take into account both correlations in scattering and energy loss, and the true effects of non-Gaussian tails in distributions of interest. Preliminary results are reported for molecular hydrogen. Further work is in progress
Constructing Complex Minds Through Multiple Authors
No full textThe World-Wide-Mind (WWM) was introduced in [Humphrys, 2001]. For a short introduction see [Humphrys, 2001a]. Briefly, this is a scheme for putting animat "minds" online (as WWM "servers") so that large complex minds may be constructed from many remote components. The aim is to address the scaling up of animat research, or how to construct minds more complex than could be written by one author (or one research group)
Analysis of the D/I, T/P Interest Dimensions as Related to Persistence in a College Major
No full textThis study examined the predictability of persistence in the same college major, throughout four years of college, from information provided by the ACT World of Work Map (WWM). The ACT interest inventory scores of 3612 high school seniors, who aspired to one of 24 chosen college majors and were college seniors 4 years later, (1097 persisters, 2515 non-persisters) were analyzed. Individual coordinate points on the WWM were calculated by converting interest scores, using the present ACT conversion formula, to locations on the grid formed by the Data/Ideas (D/I), People/Things (P/T) theoretically based interest dimensions of the WWM. The relationship between persistence in a college major, the distance between an individual's coordinate point on the WWM and each of three different types of representative points on the WWM for each chosen occupational field, and the distance that occupational coordinate point lies from the center of the WWM were examined.Results indicate that it is possible to develop a predictability measure based on the distance an individual coordinate point lies from the occupational coordinate point, adding to the information which users of the ACT interest inventory may receive. It was also found that persistence rate does not change as different occupational points range from the center to the outer edge of the WWM. However, persisters who aspire to a college major with an occupational coordinate point near the center have a larger dispersion of individual coordinate points than those aspiring to college majors with a representative occupational coordinate point distant from the center of the WWM. Theoretically, this finding adds to the descriptive understanding of individuals who are not highly differentiated in their interests, practically, ACT could develop a system of providing these individuals information which encourages them to explore, not only occupations representative of their interest area, but also any occupations with a wide diversity of tasks (those located closest to the center of the WWM). While the present job family locations of the WWM provide a substantially representative method, using the centroid of the scatter of individual coordinate points of persisters as the occupational coordinate point provides a more sensitive and descriptive reference point. (Abstract shortened with permission of author.)Made available in DSpace on 2014-12-15T18:51:39Z (GMT). No. of bitstreams: 1
8803104.pdf: 8730431 bytes, checksum: a3834a47b159677e2c9a35b385d91c9d (MD5)
Previous issue date: 1987Embargo set by: Seth Robbins for item 69318
Lift date: Forever
Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDsRestricted to the U of I community idenfinitely during batch ingest of legacy ETDsU of I Only286 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1987
Feasibility of a 10-week community-based mobile health rehabilitation program using the WalkWithMe application in late sub-acute and chronic stroke survivors in a low resource setting: A pilot study
No full textPhysical functioning can be increased in people with stroke by using a mobile health application. This study aimed to investigate the feasibility of a 10-week community-based program using the WalkWithMe (WWM) application in people with late sub-acute and chronic stroke in Benin. An interventional pilot study with mixed methods research design was used examining the application of an unsupervised individualized mobile Health (mHealth) instructed training program. Main outcome included the application usage, safety, adherence, perceived enjoyment, mHealth quality, patient experiences and pre-post efficacy measures. Nine adults, five males, median age of 60 years and time since stroke of 12 months participated in this study. For most participants adherence with the application was over 70%. However, some usability problems were observed due to incorrect understanding and use by participants and technical problems. The application was very fun, stimulating and enjoyable. Significant improvements were found with median (pre/post measures) of locomotors skill (1.4/3.4); impairments (38/40), Barthel Index (85/95), activity limitation (2.1/3.1), and quality of life (194/218). A trend towards significant improvement was found with 6 minutes walking test (181/220, p = 0.06). The WWM application is perceived as a potential approach to increase physical activity and functioning among people with stroke in Benin.The author(s) reported there is no funding associated with the work featured in this article
An herbal nasal drop enhanced frontal and anterior cingulate cortex activity
No full textAuthor name used in this publication: Mei-chun ChungAuthor name used in this publication: Winnie W. Leung2009-2010 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishedC
Ab initio liquid hydrogen muon cooling simulations with ELMS
No full textThis paper presents new theoretical results on the passage of muons through liquid hydrogen which have been confirmed in a recent experiment. These are used to demonstrate that muon bunches may be compressed by ionization cooling more effectively than suggested by previous calculations. Muon cooling depends on the differential cross section for energy loss and scattering of muons. We have calculated this cross section for liquid H 2 from first principles and atomic data, avoiding traditional assumptions. Thence, 2D probability maps of energy loss and scattering in thicknesses of less than a mm are derived by folding, and stored in a database. Large first-order correlations between energy loss and scattering are found for H 2, which are absent in other simulations. This code is named ELMS (energy loss and multiple scattering). Using these maps single particle trajectories may be tracked by Monte Carlo with stepsize of 1 mm or less. This processor has been inserted into the cooling code ICOOL. Significant improvements in 6D muon cooling are predicted compared with previous predictions based on GEANT. This is examined in various geometries. The large correlation effect is found to have only a small effect on cooling. The experimental scattering observed for liquid H 2 in the MUSCAT experiment is found to be in good agreement with the ELMS prediction, but in poor agreement with GEANT4 simulation. © 2007 IOP Publishing Ltd
Seismic strengthening of partially grouted masonry walls with openings: evaluation of ferrocement and BTRM solutions
No full textThis paper presents an experimental study on the seismic performance of partially grouted reinforced masonry (PG-RM) walls strengthened with two solutions: Ferrocement coating (welded wire steel mesh embedded in cementitious mortar, WWM) and Basalt Textile Reinforced Mortar (BTRM) layer. For this purpose, two full-scale walls were built with hollow concrete units, with identical geometry and construction details of a previously reported tested wall, which acts as the control specimen (unstrengthened case) in this study. The walls, with a window-type opening and another door-type opening, were strengthened on one of their sides and tested under the combined action of constant axial compression and cyclic lateral loading up to failure. The experimental results show that both strengthening solutions increased the investigated walls' initial stiffness and lateral capacity. The increase in lateral capacity of both solutions was similar, about 37%. The 2D-DIC analysis implemented during the tests was instrumental in highlighting the areas on the strengthened walls where high strains were developed. The damage registered on the BTRM layer was more consistent with what was observed on the surface of the unstrengthened wall. Meanwhile, the damage reported on the wall strengthened with WWM did not exhibit apparent damage at higher drift levels due to the detachment between the ferrocement coating and the masonry substrate. Finally, the performance of some procedures to compute the contribution of the studied strengthening solutions was also assessed.This research received financial support from the Agencia Nacional de Investigación y Desarrollo de Chile (ANID) through Fondecyt Regular grant No. 1221407. Luis Pérez-Pinedo, Rolando Alvarado, and Laura Vargas acknowledge the funding provided by the scholarships ANID-PFCHA/Doctorado Nacional/2019–21200706, 2019–21190320, and 2019–21191181. The last author is a Serra Húnter Fellow. Finally, the authors want to thank the companies Ubique Spa and Kerakoll Spa for providing the materials for the experimental program.Peer ReviewedPostprint (author's final draft
Shaolin dan tian breathing fosters relaxed and attentive mind: a randomized controlled neuro-electrophysiological study
No full textAuthor name used in this publication: Mei-Chun CheungAuthor name used in this publication: Winnie Wing-Man Leung2010-2011 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishedC
Dejian mind-body intervention improves the cognitive functions of a child with autism
No full textAuthor name used in this publication: Mei-Chun Cheung2010-2011 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishedC
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