11,898 research outputs found
Man-computer role in space navigation and guidance Final report
Man computer roles and hardware requirements for navigation and guidance in deep space manned mission
Man-computer roles in space navigation and guidance, phase I
Estimated man-machine requirement computations for space navigation and guidanc
When the Disability Is Not the Problem - Experiencing the Barriers to Web Accessibility: The Experiences of Computer Users with Visual Disabilities Using the Internet
The purpose of this study is to describe the experiences and perceptions of three computer users with visual disabilities as they accessed and reviewed Web pages on the Internet. Attention is focused on the use of the Internet by individuals with visual disabilities: blindness, low vision, and deaf/blindness.
Data were gathered through interviews and observation, during eight sessions with each participant. Data were qualitatively analyzed using an inductive process (Hatch, 2002). Data analysis revealed six categories of meaning: interactions with computer; personal characteristics, strategies to find solutions to barriers encountered; personal feeling and opinions; design features, and communication.
Sites viewed included commercial, educational, non-profit, and governmental sites. Interviews consisted of structured and unstructured questions.
The knowledge gained in this study will add to the literature of Web Accessibility and will contribute to raising awareness of the barriers that computer users with visual disabilities encounter when using the Internet
Hör- und Gleichgewichtsstörungen im Spannungsfeld unklarer Pathogenese, herausfordernder Diagnosestellung, Patientenberatung und Therapie
Higher-order Continuum Approximation for Rarefied Gases
The Hilbert-Chapman-Enskog expansion of the kinetic equations in mean flight
times is believed to be asymptotic rather than convergent. It is therefore
inadvisable to use lower order results to simplify the current approximation as
is done in the traditional Chapman-Enskog procedure, since that is an iterative
method. By avoiding such recycling of lower order results, one obtains
macroscopic equations that are asymptotically equivalent to the ones found in
the Chapman-Enskog approach. The new equations contain higher order terms that
are discarded in the Chapman-Enskog method. These make a significant impact on
the results for such problems as ultrasound propagation. In this paper, it is
shown that these results turn out well with relatively little complication when
the expansions are carried to second order in the mean free time, for the
example of the relaxation or BGK model of kinetic theory.Comment: 20 pages, 2 figures, RevTeX 4 macro
Bound States of the Klein-Gordon Equation for Woods-Saxon Potential With Position Dependent Mass
The effective mass Klein-Gordon equation in one dimension for the Woods-Saxon
potential is solved by using the Nikiforov-Uvarov method. Energy eigenvalues
and the corresponding eigenfunctions are computed. Results are also given for
the constant mass case.Comment: 13 page
Global shallow water magnetohydrodynamic waves in the solar tachocline
We derive analytical solutions and dispersion relations of global magnetic
Poincar\'e (magneto-gravity) and magnetic Rossby waves in the approximation of
shallow water magnetohydrodynamics. The solutions are obtained in a rotating
spherical coordinate system for strongly and weakly stable stratification
separately in the presence of toroidal magnetic field. In both cases magnetic
Rossby waves split into fast and slow magnetic Rossby modes. In the case of
strongly stable stratification (valid in the radiative part of the tachocline)
all waves are slightly affected by the layer thickness and the toroidal
magnetic field, while in the case of weakly stable stratification (valid in the
upper overshoot layer of the tachocline) magnetic Poincar\'e and fast magnetic
Rossby waves are found to be concentrated near the solar equator, leading to
equatorially trapped waves. However, slow magnetic Rossby waves tend to
concentrate near the poles, leading to polar trapped waves. The frequencies of
all waves are smaller in the upper weakly stable stratification region than in
the lower strongly stable stratification one
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