5,976 research outputs found
DH
No full textThe behavior of double helices (DH* formed in the temperature interval N* -SmA* in compounds of non-chiral liquid crystals doped with chiral molecules was investigated. Two different systems presenting left-handed and right-handed chirality were studied. A statistics of the handedness of the DH* revealed a correlation with the mixture chirality, as predicted theoretically in C. Meyer, Yu. A. Nastishin, M. Kleman, Phys. Rev. E 82, 031704 (2010). By applying a gradually increasing AC electric field, one can observe the shrinking of the cylinder circumscribing the DH* . This shrink is accompanied by a reduction of the DH* 's pitch. This effect was similar to the one produced by the decrease of temperature in the absence of the field
jDHBenelux Author Template
No full textThis repository contains the latest official GitHub hosted versions of the LaTeX template that authors are required to use when they finalize their contribtions to the DH Benelux Journal. The repository synchronises with the corresponding easy-to-use and well-documented Overleaf Template that provides authors with a low threshold environment for writing LaTeX – but can be used with any LaTeX compiler.
About this Release: Apart from some minor changes to the .cls, v2.0 introduces a number of new files to improve open source development with git and GitHub, including a README, a CC-BY 4.0 License, and a .gitignore file. It also prepares the repository for synchronisation with Zenodo, to improve sustainability.
Full Changelog: https://github.com/DHBenelux/jDHBenelux-author-template/compare/v1.1...v2.
Towards the tumble resistant microlight
No full textThe tumble mode is a pitching departure from controlled flight which leads to a pitch autorotation that is generally unrecoverable – resulting in vertical ground impact, usually preceded by in-flight breakup (the mechanism for which, surprisingly, can sometimes prevent loss of life). This was identified in work led by the British Microlight Aircraft Association beginning in 1997 as a response to a number of fatal accidents in Rogallo winged microlight aeroplanes, although the tumble is also known to occur to hang-gliders. This paper explains how this class of aeroplane is controlled, and how it has been found that they can enter the tumble mode. The mechanism by which the tumble can be entered is described. This has led to work showing how flight testing can be used to establish and demonstrate resistance to tumble entry – particularly important with increasing number of very high performance flexwings. These flight tests will be explained, together with the significance of the results. Recent accident investigation work has also shown a new mechanism of tumble entry, through partial failure of the A-frame structure and the pitch-trimmer mechanism. Also described is a possible relevance to well known historical accidents to flying wing aeroplanes– specifically the YB-49 and dH-108, and discovered data on the characteristics of the BKB-1flying wing glider; are also described
Calculation of intrinsic stress by creep deformation of an Si substrate on chemical vapor deposited diamond films
No full textDiamond films were deposited on a p-type Si substrate by a hot-filament chemical vapor deposition method. We observed intrinsic stress of the film by creep deformation of the Si substrate, and deduced intrinsic residual stresses of films using the power-law creep equation. Thermal strain and creep strain in the Si substrate were subtracted from the total ex situ measured strain. Thermal strain was removed by the numerical method, and creep strains in the substrate were examined by measuring the curvature of Si substrates which had been removed from the diamond films by the electron cyclotron resonance etching process using oxygen plasma. The results showed that creep deformation of the Si substrates must be considered when residual stresses are measured by the curvature method. This is especially true in cases where the film was thick, or when temperature or stress conditions were high. From this study, we propose a new approach to measuring intrinsic stress from the creep deformation of substrates. (C) 2000 Published by Elsevier Science S.A. All rights reserved
An elastic/plastic analysis of the intrinsic stresses in chemical vapor deposited diamond films on silicon substrates
No full textDiamond films were grown over Si substrate at 1223 K by the hot filament chemical vapor deposition (CVD) method using CH(4)/H(2) gas mixtures (1%, 2%, 3% CH(4),) and the intrinsic stresses in the film were deduced using the ex situ curvature method. After subtracting the curvature change during the cooling process, average stresses in the film during the CVD process, <sigma(f)>, were calculated using the elastic/plastic analysis which treated the creep deformation of the substrate. The intrinsic stress kept increasing during the CVD process and was generally several times larger than the <sigma(f)> which tended to saturate around the film thickness (t(f)) of 10 mu m. For thicker films, substrate creep became significant and the substrate stress was substantially relaxed by creep. Fraction of the creep strain with respect to the total strain at the film-substrate interface was around similar to 1/3 when t(f)similar to 10 mu m, and increased as large as 2/3 during the film deposition. The intrinsic stress was believed to arise from the grain growth during the CVD process, because the stress deduced from the actual grain size measurements agreed reasonably with calculated values from the above analysis. Later, the diamond film layer was removed by O(2) electron cyclotron resonance etching, and the remaining curvatures of the substrate were compared with those deduced from the elastic/plastic analysis. Residual stresses in the substrate after the film removal were tensile near the interface and the substrate bottom but compressive in the middle. (C) 2000 American Institute of Physics. [S0021-8979(00)06114-4]
Comparison Between Early Functional Rehabilitation and Cast Immobilization After Minimally Invasive Repair for an Acute Achilles Tendon Rupture
No full textThe purpose of the present study was to compare the outcomes of patients with Achilles tendon rupture treated with minimally invasive repair and early functional rehabilitation with the outcomes of similar patients treated with cast immobilization. After undergoing minimally invasive surgery, a below-knee splint with the foot in 30 degrees of plantarflexion was applied to each patient for the first week. Patients were then assigned to a cast immobilization group (IG; n=25) or a functional group (FG; n=16). Data were collected during outpatient checks at 6 weeks, 3 months, 6 months, and 1 year. Outcomes of interest included range of motion (ROM), heel height, calf circumference, pain and functional score, return to work and light sports activity, and complications. The time interval for return to work in the FG was faster than that in the IG (p=.026). There was no clinically important difference between the 2 groups with regard to heel height, ROM, return to sports, calf circumference, visual analog scale, American Orthopaedic Foot and Ankle Society score, or Achilles tendon Total Rupture Score at every outpatient check except ROM difference at 6 weeks and heel height at 3 months. Rerupture occurred in 2 patients (1 [4%] in the IG and 1 [6.25%] in the FG). Early functional rehabilitation seemed to be as safe as traditional postoperative immobilization with a similar functional result and complications, but it was advantageous for the early phase of rehabilitation only
Health Risk assessment of oil leakage from an underground sotrage tank by inhalation pathway
No full textAgainst the Grain: Reading for the Challenges of Collaborative DH Pedagogy
No full textThis article provides a critical review of the past five years of literature in digital humanities pedagogy and faculty-librarian collaboration, commingled with reflections on personal practice, which extend findings from the literature. Faculty-librarian partnerships in DH pedagogy reflect a rapidly evolving area of engagement calling for expertise in teaching, subject knowledge, scholarly communication, digital technologies, and DH research methodologies. Although there is a rapidly expanding body of literature on these partnerships, the challenges of the work tend to be minimized. This article expands upon commonly encountered difficulties, and it points to potential solutions and best practices.Peer reviewe
DH Moments, Caribbean Considerations: On Reaction, Response, and Relevance in the Digital Humanities
No full textThis essay was written specifically for NYCDHWeek 2018, the theme of which was DH in the Moment: Reaction, Response, Relevance. The author examines how we define digital humanities activism and how we frame its histories. Relying primarily on examples from Caribbean-oriented digital work, the author argues for a broad definition of DH activism that allows for a variety of projects and intended audiences. In particular, the essay responds to the tendency to focus on "DH in the moment" (projects that can be done quickly and yield a high social impact) as the primary form of activism, arguing that alongside such projects we include as activist projects that have a more cumulative and less immediate effect. Recently, we have begun to ask not just what the digital humanities does, but what the digital humanities does for others. This essay considers why it is that this has become a key question in this DH moment
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