15,913 research outputs found
Low-temperature solder for joining large cryogenic structures
Three joining methods were considered for use in fabricating cooling coils for the National Transonic Facility. After analysis and preliminary testing, soldering was chosen as the cooling coil joining technique over mechanical force fit and brazing techniques. Charpy V-Notch tests, cyclic thermal tests (ambient to 77.8 K) and tensile tests at cryogenic temperatures were performed on solder joints to evaluate their structural integrity. It was determined that low temperature solder can be used to ensure good fin-to-tube contact for cooling-coil applications
Water demand characteristics of shared water and sanitation facilities : experiences from community ablution blocks in eThekwini Municipality, South Africa
The provision of communal water and sanitation facilities has been mandated by the South African Government as an interim measure for informal settlement upgrading. These services form the first step in the upgrading process and are essential in meeting the basic needs of the community. The eThekwini municipality is rolling out community ablution blocks to informal settlements throughout their jurisdiction. This paper investigates the water demand characteristics of these community ablution blocks, and provides a detailed methodology for collecting the data, which provides the 15-minute peak and average water demand. The results from January to November 2012 indicate that the majority of the water supply (60%) is used for laundry purposes, which includes the water used in the laundry basins and from the tap for off-site consumption, while the water demand for toilet flushing accounts for 16% of the total water supply from each facility. The peak and average water demand can be used for future hydraulic modelling of these, and other, communal ablution facilities
SALT Spectropolarimetry and Self-Consistent SED and Polarization Modeling of Blazars
We report on recent results from a target-of-opportunity program to obtain
spectropolarimetry observations with the Southern African Large Telescope
(SALT) on flaring gamma-ray blazars. SALT spectropolarimetry and
contemporaneous multi-wavelength spectral energy distribution (SED) data are
being modelled self-consistently with a leptonic single-zone model. Such
modeling provides an accurate estimate of the degree of order of the magnetic
field in the emission region and the thermal contributions (from the host
galaxy and the accretion disk) to the SED, thus putting strong constraints on
the physical parameters of the gamma-ray emitting region. For the specific case
of the -ray blazar 4C+01.02, we demonstrate that the combined SED and
spectropolarimetry modeling constrains the mass of the central black hole in
this blazar to .Comment: Submitted to Galaxies - Proceedings of "Polarized Emission from
Astrophysical Jets", Ierapetra, Crete, June 12 - 16, 201
Inverse scattering approach to multiwavelength Fabry-PĂ©rot laser design
A class of multiwavelength Fabry-Pérot lasers is introduced where the spectrum is tailored through a patterning of the cavity effective index. The cavity geometry is obtained using an inverse scattering approach and can be designed such that the spacing of discrete Fabry-Pérot lasing modes is limited only by the bandwidth of the inverted gain medium. A specific two-color semiconductor laser with a mode spacing in the THz region is designed, and measurements are presented demonstrating the simultaneous oscillation of the two wavelengths. The nonperiodic effective index profile of the particular two-color device considered is shown to be related to a Moiré or superstructure grating
The Behavioral Analysis Interview: Clarifying the Practice, Theory and Understanding of its Use and Effectiveness
The Behavioral Analysis Interview (BAI) is the only questioning method that has been developed
specifically to help investigators sort those who are likely to be âguiltyâ from those who are
not. In its typical application the BAI is a pre-interrogation interview that is used to focus interrogational
effort; however, it also can be used independently in order to circumscribe investigative
efforts in those cases in which there is a fixed and relatively large number of âsuspectsâ. In this
paper an overview of the BAI process is provided and the findings and limitations of the extant
bodies of field and laboratory research on the BAI are discussed. The paper concludes with suggestions
to guide future research on the BAI
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