3,589 research outputs found
The application of space technology to practical problems such as those currently facing the mountain sections of the State of Colorado
Rapid growth in small Colorado mountain communities and dangers posed by development in areas that are potentially dangerous to life and property due to natural processes are studied. Special attention was given to snow avalanche, mudflow, rockfall, landslide and flood, as well as the slow continuous and frequently imperceptible form of soil creep and associated mass movement. Data are also given on the relative reliability of ERTS and Skylab imagery and conventional photography in identifying avalanche paths and run out zones
On the Impact of Optimal Modulation and FEC Overhead on Future Optical Networks
The potential of optimum selection of modulation and forward error correction
(FEC) overhead (OH) in future transparent nonlinear optical mesh networks is
studied from an information theory perspective. Different network topologies
are studied as well as both ideal soft-decision (SD) and hard-decision (HD) FEC
based on demap-and-decode (bit-wise) receivers. When compared to the de-facto
QPSK with 7% OH, our results show large gains in network throughput. When
compared to SD-FEC, HD-FEC is shown to cause network throughput losses of 12%,
15%, and 20% for a country, continental, and global network topology,
respectively. Furthermore, it is shown that most of the theoretically possible
gains can be achieved by using one modulation format and only two OHs. This is
in contrast to the infinite number of OHs required in the ideal case. The
obtained optimal OHs are between 5% and 80%, which highlights the potential
advantage of using FEC with high OHs.Comment: Some minor typos were correcte
Application of LANDSAT data to delimitation of avalanche hazards in Montane, Colorado
The author has identified the following significant results. Photointerpretation of individual avalanche paths on single band black and white LANDSAT images is greatly hindered by terrain shadows and the low spatial resolution of the LANDSAT system. Maps produced in this way are biased towards the larger avalanche paths that are under the most favorable illumination conditions during imaging; other large avalanche paths, under less favorable illumination, are often not detectable and the smaller paths, even those defined by sharp trimlines, are only rarely identifiable
Glacial Drainage Channels as Indicators of Late-glacial Conditions in Labrador-Ungava : a Discussion
The Growth and Development of Genetics at MCV
Genetics was well established at the Medical College of Virginia by the time I joined the faculty in 1960. At least one course in genetics was required of students in the Schools of Medicine, Dentistry, Pharmacy, and Nursing. The Department of Biology and Genetics, which was in the School of Pharmacy and chaired by Dr. Roscoe D. Hughes, also had a modest graduate program in genetics and two genetics research programs, one on facial growth in twins, supported by a grant from the National Institutes of Health, and the other on the genetics of drosophila, supported by the National Science Foundation
Designing a Solid Waste Infrastructure Management Model for Integration into a National Infrastructure System-of Systems
Solid waste management is arguably one of the most important municipal services provided by government1. Given
the rapid socio-economic changes that are projected to take place in the UK2 it is important that we plan our future
waste management capacity to ensure the continuance of this valuable service. The Solid Waste Infrastructure
Management System (SWIMS) model was designed to model the current solid waste infrastructure requirements
(from collection through treatment and disposal) for an area based on its solid waste arisings. SWIMS allows an area’s
waste treatment capacity requirements to be forecast against future socio-economic change to help decision-makers
choose the right solid waste infrastructure given their goals, constraints and ideas about future conditions. The
modelling of solid waste management systems has been carried out since the 1970s3 and such modelling exercises
have been undertaken for numerous different geographical areas around the world4. However, the SWIMS model
is unique in that it was designed to also operate within a larger national infrastructure system-of-systems model,
including interdependencies with other infrastructure sectors including energy, water and waste water. To achieve
such flexibility the SWIMS model was carefully designed using object-oriented programming (OOP) principles. In
documenting this model’s design methodology we hope to demonstrate how applying OOP principles enables such
models to not only be more flexible and more easily integrated with other modelling efforts, but also more easily
understood by system experts and end-users
The NBS: Processing/Microstructure/Property Relationships in 2024 Aluminum Alloy Plates
As received plates of 2024 aluminum alloy were examined. Topics covered include: solidification segregation studies; microsegregation and macrosegregation in laboratory and commercially cast ingots; C-curves and nondestructive evaluation; time-temperature precipitation diagrams and the relationships between mechanical properties and NDE measurements; transmission electron microscopy studies; the relationship between microstructure and properties; ultrasonic characterization; eddy-current conductivity characterization; the study of aging process by means of dynamic eddy current measurements; and Heat flow-property predictions, property degradations due to improve quench from the solution heat treatment temperature
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