8,102 research outputs found
Light Transmission Through Metallic-Mean Quasiperiodic Stacks with Oblique Incidence
The propagation of s- and p-polarized light through quasiperiodic
multilayers, consisting of layers with different refractive indices, is studied
by the transfer matrix method. In particular, we focus on the transmission
coefficient of the systems in dependency on the incidence angle and on the
ratio of the refractive indices. We obtain additional bands with almost
complete transmission in the quasiperiodic systems at frequencies in the range
of the photonic band gap of a system with a periodic alignment of the two
materials for both types of light polarization. With increasing incidence angle
these bands bend towards higher frequencies, where the curvature of the
transmission bands in the quasiperiodic stack depends on the metallic mean of
the construction rule. Additionally, in the quasiperiodic systems for
p-polarized light the bands show almost complete transmission near the
Brewster's angle in contrast to the results for s-polarized light. Further, we
present results for the influence of the refractive indices at the midgap
frequency of the periodic stack, where the quasiperiodicity was found to be
most effective.Comment: 10 pages, 7 figure
The Gaussian formula and spherical aberration of the static and moving curved mirrors from Fermat's principle
The Gaussian formula and spherical aberrations of the static and relativistic
curved mirrors are analyzed using the optical path length (OPL) and Fermat's
principle. The geometrical figures generated by the rotation of conic sections
about their symmetry axes are considered for the shapes of the mirrors. By
comparing the results in static and relativistic cases, it is shown that the
focal lengths and the spherical aberration relations of the relativistic
mirrors obey the Lorentz contraction. Further analysis of the spherical
aberrations for both static and relativistic cases have resulted in the
information about the limits for the paraxial approximation, as well as for the
minimum speed of the systems to reduce the spherical aberrations.Comment: 15 pages, 7 figures, uses iopart. Major revisions on the physical
interpretations of the results. Accepted for publication in J. Op
Investment of migrant remittances : some evidence from anthropology
Thesis (M.C.P.)--Massachusetts Institute of Technology, Dept. of Urban Studies and Planning, 1984.MICROFICHE COPY AVAILABLE IN ARCHIVES AND ROTCH.Bibliography: leaves 36-38.by Joy Eliza Hecht.M.C.P
Crowded-Field Astrometry with the Space Interferometry Mission - I. Estimating the Single-Measurement Astrometric Bias Arising from Confusion
The accuracy of position measurements on stellar targets with the future
Space Interferometry Mission (SIM) will be limited not only by photon noise and
by the properties of the instrument (design, stability, etc.) and the overall
measurement program (observing strategy, reduction methods, etc.), but also by
the presence of other "confusing" stars in the field of view (FOV). We use a
simple "phasor" model as an aid to understanding the main effects of this
"confusion bias" in single observations with SIM. This analytic model has been
implemented numerically in a computer code and applied to a selection of
typical SIM target fields drawn from some of the Key Projects already accepted
for the Mission. We expect that less than 1% of all SIM targets will be
vulnerable to confusion bias; we show that for the present SIM design,
confusion may be a concern if the surface density of field stars exceeds 0.4
star/arcsec^2. We have developed a software tool as an aid to ascertaining the
possible presence of confusion bias in single observations of any arbitrary
field. Some a priori knowledge of the locations and spectral energy
distributions of the few brightest stars in the FOV is helpful in establishing
the possible presence of confusion bias, but the information is in general not
likely to be available with sufficient accuracy to permit its removal. We
discuss several ways of reducing the likelihood of confusion bias in crowded
fields. Finally, several limitations of the present semi-analytic approach are
reviewed, and their effects on the present results are estimated. The simple
model presented here provides a good physical understanding of how confusion
arises in a single SIM observation, and has sufficient precision to establish
the likelihood of a bias in most cases.Comment: 28 pages, 20 figures, 1 table; to appear in December 2007 issue of
PAS
Developments in Television Viewership
In recent years the ways in which we watch television has changed, and so has the television we watch. “Binge watching,” almost the Oxford English Dictionary’s Word of the Year in 2013, has taken a firm hold on the American television audience who now watches television not according to the broadcast schedule but on its own terms. So, too, has the practice of engaging with other audience members, be they friends, family, or strangers, while watching a show by using a secondary device – a “second screen.” These practices have been developing for some time, and as technology adapts to facilitate them the denizens of television viewers now consider them normal. The questions that follow are whether these new ways to watch television change the TV programs themselves, and whether the viewers’ emotional response to the shows is changing, too. If it is accepted as standard that audiences will watch multiple episodes of one show in a row, instead of waiting for a weekly release of a single episode, are the episodes being written with that consumption pattern in mind? Do the old conventions written into television shows to help the viewer remember what happened in the weeks before still apply? And, if viewers are looking at their second screens to follow the national response on Twitter v at the same time as they are watching a show, can they be as emotionally engaged with the show as they would be if they were focusing on the single, primary screen? There have been some studies that investigate these questions and others like them, and there is a plethora of written work ranging from scholarly papers to blog posts. The opinion columns of magazines and newspapers are full of think pieces on the effects of binge watching and the state of television today. My thesis incorporates existing research and writing with a historical overview of changes to television technology over time, as well as the results of an original survey distributed to my social network with the goal of reaching an understanding of how people are watching television and using the technology in their own lives
Computing aerodynamic sound using advanced statistical turbulence theories
It is noted that the calculation of turbulence-generated aerodynamic sound requires knowledge of the spatial and temporal variation of Q sub ij (xi sub k, tau), the two-point, two-time turbulent velocity correlations. A technique is presented to obtain an approximate form of these correlations based on closure of the Reynolds stress equations by modeling of higher order terms. The governing equations for Q sub ij are first developed for a general flow. The case of homogeneous, stationary turbulence in a unidirectional constant shear mean flow is then assumed. The required closure form for Q sub ij is selected which is capable of qualitatively reproducing experimentally observed behavior. This form contains separation time dependent scale factors as parameters and depends explicitly on spatial separation. The approximate forms of Q sub ij are used in the differential equations and integral moments are taken over the spatial domain. The velocity correlations are used in the Lighthill theory of aerodynamic sound by assuming normal joint probability
Development of sputtered techniques for thrust chambers, task 1
Filler materials proposed for use in the sputter fabrication regeneratively cooled thrust chambers were evaluated. Low melting castable alloys, CERROBEND. CERROCAST, and CERROTRU, slurry applied SERMETEL 481 and flame-sprayed aluminum were investigated as filler materials. Sputter deposition from a cylindrical cathode inverted magnestron was used to apply an OFHC copper closeout layer to filled OFHC copper ribbed-wall cylindrical substrates. The sputtered closeout layer structure was evaluated with respect to filler material contamination, predeposition machining and finishing operations, and deposition parameters. The application of aluminum by flame-spraying resulted in excessiver filler porosity. Though the outgassing from this porosity was found to be detrimental to the closeout layer structure, bond strengths in excess of 10,500 psi were achieved. Removal of the aluminum from the grooves was readily accomplished by leaching in a 7.0 molar solution of sodium hydroxide at 353 K. Of the other filler materials evaluated, CERROTRU was found to be the most suitable material with respect to completely filling the ribbed-wall cylinders and vacuum system compatibility. However, bond contamination resulted in low closeout layer bond strength with the CERROTRU filler. CERROBEND, CERROCAST, and SERMETEL 481 were found to be unacceptable as filler materials
Amplitude control of quantum interference
Usually, the oscillations of interference effects are controlled by relative
phases. We show that varying the amplitudes of quantum waves, for instance by
changing the reflectivity of beam splitters, can also lead to quantum
oscillations and even to Bell violations of local realism. We first study
theoretically a generalization of the Hong-Ou-Mandel experiment to arbitrary
source numbers and beam splitter transmittivity. We then consider a Bell type
experiment with two independent sources, and find strong violations of local
realism for arbitrarily large source number ; for small , one operator
measures essentially the relative phase of the sources and the other their
intensities. Since, experimentally, one can measure the parity of the number of
atoms in an optical lattice more easily than the number itself, we assume that
the detectors measure parity.Comment: 4 pages; 4 figure
Atmospheric-wake vortex interactions
The interactions of a vortex wake with a turbulent stratified atmosphere are investigated with the computer code WAKE. It is shown that atmospheric shear, turbulence, and stratification can provide the dominant mechanisms by which vortex wakes decay. Computations included the interaction of a vortex wake with a viscous ground plane. The observed phenomenon of vortex bounce is explained in terms of secondary vorticity produced on the ground. This vorticity is swept off the ground and advected about the vortex pair, thereby altering the classic hyperbolic trajectory. The phenomenon of the solitary vortex is explained as an interaction of a vortex with crosswind shear. Here, the vortex having the sign opposite that of the sign of the vorticity in the shear is dispersed by a convective instability. This instability results in the rapid production of turbulence which in turn disperses the smoke marking the vortex
Zur methodik der ninhydrinreaktion und papierchromatographie im zusammenhang mit untersuchungen uber gerinnungsphysiologisch interessierende phosphatide
In view of other researches, the authors have studied the ninhydrin reaktion in order to obtain evidence of free amino-N of phosphatides and their fission products.
Apart from the study of paper chromatography of nitrogenated lipoids, the details of general interest are given of the technique used by the authors. Description is given of a series of experiments of paper chromatography with cephaline, more or less purified by precipitation or dialysis, and with preparations made amino-free by the method of VAN SLYKE, before and after hydrolysis. Glutamic acid and sphingosine have been found in the hydrolysates along with cholamine and serine.
The results could be explained, according to the Discussion, by the hypothesis of disposed phosphatides in chain or ring form. The authors have also proved the presence in the phosphatides of bound amino-N which cannot be eliminated by VAN SLYKE 's method; and thus they have given an explanation of the fact observed previously that the determination of amino-N by VAN SLYKE gives higher values in the phosphatides before hydrolysis than after hydrolysis
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