8,578 research outputs found
Quasiconformal variation of slit domains
We use quasiconformal variations to study Riemann mappings
onto variable single slit domains when the slit is the tail of an appropriately
smooth Jordan arc. In the real analytic case our results answer a question of
Dieter Gaier and show that the function κ in Löwner's differential equation is
real analytic
Continuous catalytic decomposition of methane
Continuous catalytic decomposition of methane and application to space life support syste
Continuous catalytic decomposition of methane
Water is conserved by employing sequence of reactions whereby 75 percent of methane from Sabatier reaction is decomposed to solid carbon and hydrogen; hydrogen is then separated from residual methane and utilized in usual Sabatier reaction to reduce remaining metabolic carbon dioxide
Capture of non-relativistic particles in eccentric orbits by a Kerr black hole
We obtain approximate analytic expressions for the critical value of the
total angular momentum of a non-relativistic test particle moving in the Kerr
geometry, such that it will be captured by the black hole. The expressions
apply to arbitrary orbital inclinations, and are accurate over the entire range
of angular momentum for the Kerr black hole. The expressions can be easily
implemented in N-body simulations of the evolution of star clusters around
massive galactic black holes, where such captures play an important role.Comment: 8 pages, 1 figure, published versio
The ORNL-SNAP shielding program
The effort in the ORNL-SNAP shielding program is directed toward the development and verification of computer codes using numerical solutions to the transport equation for the design of optimized radiation shields for SNAP power systems. A brief discussion is given for the major areas of the SNAP shielding program, which are cross-section development, transport code development, and integral experiments. Detailed results are presented for the integral experiments utilizing the TSF-SNAP reactor. Calculated results are compared with experiments for neutron and gamma-ray spectra from the bare reactor and as transmitted through slab shields
Manufacturing requirements
In recent years, natural laminar flow (NLF) has been proven to be achievable on modern smooth airframe surfaces over a range of cruise flight conditions representative of most current business and commuter aircraft. Published waviness and boundary layer transition measurements on several modern metal and composite airframes have demonstrated the fact that achievable surface waviness is readily compatible with laminar flow requirements. Currently, the principal challenge to the manufacture of NLF-compatible surfaces is two-dimensional roughness in the form of steps and gaps at structural joints. Results of recent NASA investigations on manufacturing tolerances for NLF surfaces, including results of a flight experiment are given. Based on recent research, recommendations are given for conservative manufacturing tolerances for waviness and shaped steps
Limb regeneration revisited
The investigation of vertebrate limb regeneration, a favorite topic of early developmental biologists, is enjoying a renaissance thanks to recently developed molecular and genetic tools, as indicated in recent papers in BMC Biology and BMC Developmental Biology. Classical experiments provide a rich context for interpreting modern functional studies
Central Business District Planning and the Control of Outlying Shopping Centers
The Urban Land Institute (ULI) reports that for the first time in twenty-five years there is clear evidence that major retailers are showing a renewed interest in downtown, indicating a basic shift in retail strategies. According to ULI, this shift has been brought about by a slowdown in suburban population growth, environmental pressures and overbuilding, coupled with the basic advantages of downtown including ready access, substantial populations of daytime workers, and, in many locations, reviving neighborhoods close to the central business district
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Regeneration review reprise
There have been notable advances in the scientific understanding of regeneration within the past year alone, including two recently published in BMC Biology. Increasingly, progress in the regeneration field is being inspired by comparisons with stem cell biology and enabled by newly developed techniques that allow simultaneous examination of thousands of genes and proteins
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