188 research outputs found
SOME REFLECTIONS ON NEW YORK CITY\u27S DISABILITY LAW
The article provides a broad overview of general disability law, and the distinctive features of New York City\u27s disability law. The author introduces American human rights law as distinct in that it does not purport to advance the needs of the disabled, but merely penalizes individuals found to discriminate against them. After providing a definition of disability discrimination by drawing parallels to race, the article outlines the impacts of New York City\u27s uniquely broad definition of disability and concludes that the disabled are inevitably given less relief than a model which understands their needs, while at the same time the uniqueness of disability law from other forms of discrimination often leads to a protection of substantive rights for the disabled that are unavailable to other victims of discrimination. Finally, the author draws on case studies to illustrate the problems in fashioning remedies for discrimination violations
Development of an Unstructured 3-D Direct Simulation Monte Carlo/Particle-in-Cell Code and the Simulation of Microthruster Flows
This work is part of an effort to develop an unstructured, three-dimensional, direct simulation Monte Carlo/particle-in-cell (DSMC/PIC) code for the simulation of non-ionized, fully ionized and partially-ionized flows in micropropulsion devices. Flows in microthrusters are often in the transitional to rarefied regimes, requiring numerical techniques based on the kinetic description of the gaseous or plasma propellants. The code is implemented on unstructured tetrahedral grids to allow discretization of arbitrary surface geometries and includes an adaptation capability. In this study, an existing 3D DSMC code for rarefied gasdynamics is improved with the addition of the variable hard sphere model for elastic collisions and a vibrational relaxation model based on discrete harmonic oscillators. In addition the existing unstructured grid generation module of the code is enhanced with grid-quality algorithms. The unstructured DSMC code is validated with simulation of several gaseous micronozzles and comparisons with previous experimental and numerical results. Rothe s 5-mm diameter micronozzle operating at 80 Pa is simulated and results are compared favorably with the experiments. The Gravity Probe-B micronozzle is simulated in a domain that includes the injection chamber and plume region. Stagnation conditions include a pressure of 7 Pa and mass flow rate of 0.012 mg/s. The simulation examines the role of injection conditions in micronozzle simulations and results are compared with previous Monte Carlo simulations. The code is also applied to the simulation of a parabolic planar micronozzle with a 15.4-micron throat and results are compared with previous 2D Monte Carlo simulations. Finally, the code is applied to the simulation of a 34-micron throat MEMS-fabricated micronozzle. The micronozzle is planar in profile with sidewalls binding the upper and lower surfaces. The stagnation pressure is set at 3.447 kPa and represents an order of magnitude lower pressure than used in previous experiments. The simulation demonstrates the formation of large viscous boundary layers in the sidewalls. A particle-in-cell model for the simulation of electrostatic plasmas is added to the DSMC code. Solution to Poisson\u27s equation on unstructured grids is obtained with a finite volume implementation. The Poisson solver is validated by comparing results with analytic solutions. The integration of the ionized particle equations of motion is performed via the leapfrog method. Particle gather and scatter operations use volume weighting with linear Lagrange polynomial to obtain an acceptable level of accuracy. Several methods are investigated and implemented to calculate the electric field on unstructured meshes. Boundary conditions are discussed and include a formulation of plasma in bounded domains with external circuits. The unstructured PIC code is validated with the simulation of a high voltage sheath formation
Detecting Authorship, Hands, and Corrections in Historical Manuscripts. A Mixedmethods Approach towards the Unpublished Writings of an 18th Century Czech Emigré Community in Berlin (Handwriting)
When one starts working philologically with historical manuscripts, one faces important first questions involving authorship, writersâ hands andthe history of documenttransmission. These issues are especially thorny with documents remaining outside the established canon, such as privatemanuscripts, aboutwhichwehave very restrictedtext-externalinformation. In this area â so we argue â it is especially fruitful to employ a mixed-methods approach, combiningtailored automatic methods from image recognition/analysis with philological and linguistic knowledge.Whileimage analysis captureswritersâ hands, linguistic/philological research mainly addressestextual authorship;thetwo cross-fertilize and obtain a coherent interpretation which may then be evaluated against the available text-external historical evidence. Departingfrom our âlab caseâ,whichis a corpus of unedited Czechmanuscriptsfromthe archive of a small 18th century migrant community, the Herrnhuter BrĂŒdergemeine (Brethren parish) in Berlin-Neukölln, our project has developed an assistance system which aids philologists in working with digitized (scanned) hand-written historical sources. We present its application and discuss its general potential and methodological implications
On the problem of the quotations in Samuel Reussâ commentaries on his Codexy revĂșcke
Samuel Reuss, a precursor of modern Slovak ethnography from the first half of the 19th c., collected numerous Slovak folk tales on which he wrote detailed commentaries in German. They include numerous quotations from various sources, e.g. Classics, historiographical and geographical works etc. thus proving Reussâ tremendous encyclopedic knowledge. Both folk tales and commentaries are contained in three hitherto unpublished manuscripts known as Codexy revĂșcke. The present article examines Reussâ quotations from the point of view of their critical edition and differentiates between three categories: 1) quotations whose sources are correctly mentioned; 2) correct quotations but with incorrect reference to their sources: 3) paraphrases of sources. The article discusses possibilities of identifying the sources from which Reuss quoted and suggests possible solutions to presenting the quotations in a critical edition
Die Entwicklung der Ausdrucksmittel der russischen Praesens- und Praeteritalflexion
The present work ... is intended to supplement the synchronous descriptions of Slavic verbflexion so far with the so-called "analytic-synthetic-functional method" by a diachronic investigation. She may refer to the preparatory work of T. BERGER (1981a) and W. LEHFELDT (1983a) and wants to build a bridge between the method and the research done in recent decades in the field of diachronic linguistics and the historical Slavic phonology, morphology and accentology
Using an outliner with a word processor
How do college students use computer-based outliners? What impact do these tools have on writing processes and products? This study examines the use of an outliner with a word processor by novice and advanced college writers. It also examines the impact of embedded prompts addressing topical and rhetorical issues. It shows how the outliner with embedded topical prompts serves both to increase the planning of novice writers and to connect this planning to their texts. These interventions are less effective for advanced writers. And the outliner without the prompts is also less effective for novice writers. Implications for classroom use of these tools are discussed.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/30852/1/0000514.pd
Implementation and performance of SIBYLS: a dual endstation small-angle X-ray scattering and macromolecular crystallography beamline at the Advanced Light Source.
The SIBYLS beamline (12.3.1) of the Advanced Light Source at Lawrence Berkeley National Laboratory, supported by the US Department of Energy and the National Institutes of Health, is optimized for both small-angle X-ray scattering (SAXS) and macromolecular crystallography (MX), making it unique among the world's mostly SAXS or MX dedicated beamlines. Since SIBYLS was commissioned, assessments of the limitations and advantages of a combined SAXS and MX beamline have suggested new strategies for integration and optimal data collection methods and have led to additional hardware and software enhancements. Features described include a dual mode monochromator [containing both Si(111) crystals and Mo/B(4)C multilayer elements], rapid beamline optics conversion between SAXS and MX modes, active beam stabilization, sample-loading robotics, and mail-in and remote data collection. These features allow users to gain valuable insights from both dynamic solution scattering and high-resolution atomic diffraction experiments performed at a single synchrotron beamline. Key practical issues considered for data collection and analysis include radiation damage, structural ensembles, alternative conformers and flexibility. SIBYLS develops and applies efficient combined MX and SAXS methods that deliver high-impact results by providing robust cost-effective routes to connect structures to biology and by performing experiments that aid beamline designs for next generation light sources
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Association of severity of primary open-angle glaucoma with serum vitamin D levels in patients of African descent.
PurposeTo study the relationship between primary open-angle glaucoma (POAG) in a cohort of patients of African descent (AD) and serum vitamin D levels.MethodsA subset of the AD and glaucoma evaluation study III (ADAGES III) cohort, consisting of 357 patients with a diagnosis of POAG and 178 normal controls of self-reported AD, were included in this analysis. Demographic information, family history, and blood samples were collected from all the participants. All the subjects underwent clinical evaluation, including visual field (VF) mean deviation (MD), central cornea thickness (CCT), intraocular pressure (IOP), and height and weight measurements. POAG patients were classified into early and advanced phenotypes based on the severity of their visual field damage, and they were matched for age, gender, and history of hypertension and diabetes. Serum 25-Hydroxy (25-OH) vitamin D levels were measured by enzyme-linked immunosorbent assay (ELISA). The association of serum vitamin D levels with the development and severity of POAG was tested by analysis of variance (ANOVA) and the paired t-test.ResultsThe 178 early POAG subjects had a visual field MD of better than -4.0 dB, and the 179 advanced glaucoma subjects had a visual field MD of worse than -10 dB. The mean (95% confidence interval [CI]) levels of vitamin D of the subjects in the control (8.02 ± 6.19 pg/ml) and early phenotype (7.56 ± 5.74 pg/ml) groups were significantly or marginally significantly different from the levels observed in subjects with the advanced phenotype (6.35 ± 4.76 pg/ml; p = 0.0117 and 0.0543, respectively). In contrast, the mean serum vitamin D level in controls was not significantly different from that of the subjects with the early glaucoma phenotype (p = 0.8508).ConclusionsIn this AD cohort, patients with advanced glaucoma had lower serum levels of vitamin D compared with early glaucoma and normal subjects
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