474 research outputs found
Evaluation of Materials and Concepts for Aircraft Fire Protection
Woven fiberglass fluted-core simulated aircraft interior panels were flame tested and structurally evaluated against the Boeing 747 present baseline interior panels. The NASA-defined panels, though inferior on a strength-to-weight basis, showed better structural integrity after flame testing, due to the woven fiberglass structure
Fire safety evaluation of aircraft lavatory and cargo compartments
Large-scale aircraft lavatory and cargo compartment fire tests are described. Tests were conducted to evaluate the effectiveness of these compartments to contain fire and smoke. Two tests were conducted and are detailed. Test 1 involved a production Boeing 747 lavatory of the latest design installed in an enclosure outside the aircraft, to collect gases and expose animals to these gases. Results indicate that the interior of the lavatory was completely burned, evolving smoke and combustion products in the enclosure. Test 2 involved a simulated Douglas DC-10 cargo compartment retro-fitted with standard fiberglass liner. The fire caused excessive damage to the liner and burned through the ceiling in two areas. Test objectives, methods, materials, and results are presented and discussed
Spectroscopy of the neighboring massive clusters Abell 222 and Abell 223
We present a spectroscopic catalog of the neighboring massive clusters Abell
222 and Abell 223. The catalog contains the positions, redshifts, R magnitudes,
V-R color, as well as the equivalent widths for a number of lines for 183
galaxies, 153 of them belonging to the A 222 and A 223 system. We determine the
heliocentric redshifts to be z=0.2126+/-0.0008 for A 222 and z=0.2079+/-0.0008
for A 223. The velocity dispersions of both clusters in the cluster restframe
are about the same: sigma = 1014^{+90}_{-71} km/s and sigma = 1032^{+99}_{-76}
km/s for A 222 and A 223, respectively. While we find evidence for substructure
in the spatial distribution of A 223, no kinematic substructure can be
detected. From the red cluster sequence identified in a
color--magnitude--diagram we determine the luminosity of both clusters and
derive mass--to--light ratios in the R--band of (M/L)_A222 = (202+/-43) h_70
M_{su}n/L_{sun} and (M/L)_A223 = (149+/-33) h_70 M_{sun}/L_{sun}. Additionally
we identify a group of background galaxies at z ~ 0.242.Comment: Accepted for publication in A&A, 10 pages, 9 figures, full version of
table 2 included in source distribution, version with higher quality images
available from http://www.astro.uni-bonn.de/~dietrich
A High Fidelity Sample of Cold Front Clusters from the Chandra Archive
This paper presents a sample of "cold front" clusters selected from the
Chandra archive. The clusters are selected based purely on the existence of
surface brightness edges in their Chandra images which are modeled as density
jumps. A combination of the derived density and temperature jumps across the
fronts is used to select nine robust examples of cold front clusters:
1ES0657-558, Abell 1201, Abell 1758N, MS1455.0+2232, Abell 2069, Abell 2142,
Abell 2163, RXJ1720.1+2638, and Abell 3667. This sample is the subject of an
ongoing study aimed at relating cold fronts to cluster merger activity, and
understanding how the merging environment affects the cluster constituents.
Here, temperature maps are presented along with the Chandra X-ray images. A
dichotomy is found in the sample in that there exists a subsample of cold front
clusters which are clearly mergers based on their X-ray morphologies, and a
second subsample which harbor cold fronts, but have surprisingly relaxed X-ray
morphologies, and minimal evidence for merger activity at other wavelengths.
For this second subsample, the existence of a cold front provides the sole
evidence for merger activity at X-ray wavelengths. We discuss how cold fronts
can provide additional information which may be used to constrain merger
histories, and also the possibility of using cold fronts to distinguish major
and minor mergers.Comment: 25 pages, 10 figures. Accepted for publication in ApJ. A high
resolution version is available for download at:
http://www.astronomy.swin.edu.au/~mowers/cold_front_paper.ps.g
Principles for the design and operation of engineer-to-order supply chains in the construction sector
By integrating the approaches of Forrester and Burbidge [Forrester, J. W. 1961. Industrial Dynamics. Pegasus Communications; Burbidge, J. L. 1961. “The “New Approach” to Production.” Production Engineer 40: 769–784], a set of five design principles have emerged which provide a foundation for sound supply chain design. The ‘FORRIDGE’ principles have since been shown to be a powerful guide for effective design of make-to-stock supply chains. However, some have questioned the applicability of generic supply chain thinking, arguing for a tailored approach. Hence, the goal here is to investigate how these principles should be adapted for engineer-to-order (ETO) industries, such as construction, capital goods and shipbuilding. The empirical elements draw on an extensive study of 12 suppliers and two large contractors in the construction industry. Supply chain tactics are identified for this range of companies, which are matched with real world problems, and linked with the FORRIDGE principles. This results in an additional ‘Design for X’ principle being proposed. The contributions made are the adaptation of established principles for the ETO sector, and the framework behind these principles
Clinical rating scale for pantothenate kinase-associated neurodegeneration: A pilot study
Pantothenate kinase-associated neurodegeneration is a progressive neurological disorder occurring in both childhood and adulthood. The objective of this study was to design and pilot-test a disease-specific clinical rating scale for the assessment of patients with pantothenate kinase-associated neurodegeneration.info:eu-repo/semantics/publishedVersio
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