2,445 research outputs found
Lunar base launch and landing facilities conceptual design
The purpose of this study was to perform a first look at the requirements for launch and landing facilities for early lunar bases and to prepared conceptual designs for some of these facilities. The emphasis of the study is on the facilities needed from the first manned landing until permanent occupancy, the Phase 2 lunar base. Factors including surface characteristics, navigation system, engine blast effects, and expected surface operations are used to develop landing pad designs, and definitions fo various other elements of the launch and landing facilities. Finally, the dependence of the use of these elements and the evolution of the facilities are established
The hierarchy of stability and predictability in orthognathic surgery with rigid fixation: an update and extension
A hierarchy of stability exists among the types of surgical movements that are possible with orthognathic surgery. This report updates the hierarchy, focusing on comparison of the stability of procedures when rigid fixation is used. Two procedures not previously placed in the hierarchy now are included: correction of asymmetry is stable with rigid fixation and repositioning of the chin also is very stable. During the first post-surgical year, surgical movements in patients treated for Class II/long face problems tend to be more stable than those treated for Class III problems. Clinically relevant changes (more than 2 mm) occur in a surprisingly large percentage of orthognathic surgery patients from one to five years post-treatment, after surgical healing is complete. During the first post-surgical year, patients treated for Class II/long face problems are more stable than those treated for Class III problems; from one to five years post-treatment, some patients in both groups experience skeletal change, but the Class III patients then are more stable than the Class II/long face patients. Fewer patients exhibit long-term changes in the dental occlusion than skeletal changes, because the dentition usually adapts to the skeletal change
Partial-Transfer Absorption Imaging: A versatile technique for optimal imaging of ultracold gases
Partial-transfer absorption imaging is a tool that enables optimal imaging of
atomic clouds for a wide range of optical depths. In contrast to standard
absorption imaging, the technique can be minimally-destructive and can be used
to obtain multiple successive images of the same sample. The technique involves
transferring a small fraction of the sample from an initial internal atomic
state to an auxiliary state and subsequently imaging that fraction absorptively
on a cycling transition. The atoms remaining in the initial state are
essentially unaffected. We demonstrate the technique, discuss its
applicability, and compare its performance as a minimally-destructive technique
to that of phase-contrast imaging.Comment: 10 pages, 5 figures, submitted to Review of Scientific Instrument
Seasonal adaptation in Gould's long-eared bat; Nyctophilus gouldi tomes 1858 (Microchiroptera: Vespertilionidae)
An Introduction To Cost-Of-Living Adjustments In Public Retirement Plans: Details Matter
While financial planning students are expected to be able to understand client retirement plans, subtle differences in cost-of-living adjustments can have major impact on the success of client retirement plans. This teaching note compares the cost-of-living adjustments in the largest government sponsored retirement systems and a hypothetical traditional privately sponsored plan. Using a Monte Carlo simulation, we estimate the impact on retirement experience from the different COLAs. These differences are large, with differing protection from future inflation and differing risk for running out of money during retirement. This teaching note will help instructors address Certified Financial Planner (CFP) Board Learning Outcome G.52 “Retirement Needs Analysis”.  The material may also be used in economics, human resources, public administration, and other classes addressing policy aspects of retirement plans
Gravitational wave detectors based on matter wave interferometers (MIGO) are no better than laser interferometers (LIGO)
We show that a recent claim that matter wave interferometers have a much
higher sensitivity than laser interferometers for a comparable physical setup
is unfounded. We point out where the mistake in the earlier analysis is made.
We also disprove the claim that only a description based on the geodesic
deviation equation can produce the correct physical result. The equations for
the quantum dynamics of non-relativistic massive particles in a linearly
perturbed spacetime derived here are useful for treating a wider class of
related physical problems. A general discussion on the use of atom
interferometers for the detection of gravitational waves is also provided.Comment: 16 pages, REVTeX4; minor changes, one figure and a few references
were added, an additional appendix was included where we explain why,
contrary to the claims in gr-qc/0409099, the effects due to the reflection
off the mirrors cancel out in the final result for the phase shif
Prospectus, May 28, 1979
HERE WE GO AGAIN: REGISTRATION HASSLES; Stugo takes action; \u27Chaos\u27 to highlight beginning of school; Commuter program will help Parkland people save gas; Stugo elections for ten seats is 12-13; Dedication features teleconferencing; Women to show defense; Computer majors eligible for ICP scholarship; Gammon on top of Comm. Dept.; Volunteers are wanted at UI; After registration, it can only get better; More music plays at PC; A quiz from abroad; Honor students total 46; IOC will meet next Tuesday; Dupe dept. is expanding; VA rules upheld in courts; ID rules listed; Slick can hurt Midwest; Parking regulations listed; Top 10 List from WPCD Radio; Athletic schedules: Golf Schedule -- 1979, Cross Country Schedule -- 1979, Women\u27s Volleyball Schedule -- 1979; Roueche suggests using videotapes of lectures; Pres. Staerkel greets students; PC lists job opportunities; Classified Advertising; Advertising Policy; Tickets are on sale on operas; New organization \u27flocks\u27 with others; Tenant Union plant sale will be held next weekend; Women\u27s b-ball to have meeting; Student organizations listed; Fast Freddy forecasts againhttps://spark.parkland.edu/prospectus_1979/1015/thumbnail.jp
Macrostructural analysis : unravelling polyphase glacitectonic histories
Many Pleistocene glacial profiles look extremely simple, comprising till, or glacitectonite, overlying
older sediments or bedrock (Figure 4.1). In more complex sequences the till may itself be overlain by
younger sediments laid down as the ice retreated or during a completely separate, later phase of
advance. Macroscopically, subglacial traction tills (Evans et al., 2007) are typically massive,
unstructured deposits suggesting that it should be relatively straightforward to unravel the
glacitectonic deformation history recorded by the sequence. Many reconstructions do indeed look
very simple, slabs of sediment have been tilted and stacked and then overridden by the glacier to
cap the structure with till. Added to this is the use of vertical exaggeration which makes the whole
structure look like alpine tectonics (for an example see fig. 5 in van Gijssel, 1987). Dropping the
exaggeration led to the recognition that actually we were looking at much more horizontal
structures, i.e. overriding nappes and not imbricated slabs (van der Wateren, 1987).
Traditionally (van der Meer, 1987) glaciotectonics was thought to relate to large structures
like big push moraines and not to smaller structures like drag structures underneath tills (Figure 4.2),
let alone to the tills themselves. With the notion that deforming bed tills are tectonically and not
sedimentologically structured and could be regarded as tectomicts (Menzies et al., 2006), comes the
realisation that glacitectonics happens across a wide range of scales, from the microscopic to tens of
kilometres. Only by realising the full range of glaciotectonic scales can we hope to understand the
processes
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