3,405 research outputs found
Alien Registration- Laursen, Martin R. (Presque Isle, Aroostook County)
https://digitalmaine.com/alien_docs/33517/thumbnail.jp
A Scalable GPU-Based Approach to Shading and Shadowing for Photo-Realistic Real-Time Augmented Reality
Performance Comparison of Techniques for Approximating Image-Based Lighting by Directional Light Sources
Grid of Lya radiation transfer models for the interpretation of distant galaxies
Lya is a key diagnostic for numerous observations of distant star-forming
galaxies. It's interpretation requires, however, detailed radiation transfer
models. We provide an extensive grid of 3D radiation transfer models simulating
the Lya and UV continuum radiation transfer in the interstellar medium of
star-forming galaxies. We have improved our Monte Carlo MCLya code, and have
used it to compute a grid of 6240 radiation transfer models for homogeneous
spherical shells containing HI and dust surrounding a central source. The
simulations cover a wide range of parameter space. We present the detailed
predictions from our models including in particular the Lya escape fraction
fesc, the continuum attenuation, and detailed Lya line profiles. The Lya escape
fraction is shown to depend strongly on dust content, but also on other
parameters (HI column density and radial velocity). The predicted line profiles
show a great diversity of morphologies ranging from broad absorption lines to
emission lines with complex features. The results from our simulations are
distributed in electronic format. Our models should be of use for the
interpretation of observations from distant galaxies, for other simulations,
and should also serve as an important base for comparison for future, more
refined, radiation transfer models.Comment: Accepted for publication in Astronomy & Astrophysics. Results from
simulations available at http://obswww.unige.ch/sf
Development of two Brown Norway rat models for the assessment of primary prevention and desensitsing capacity of cow's milk based hydrolysates
Computer Model for Dynamic Skyline Behaviour
The development and experimental verification of a numerical model for the dynamic behavior of a cable logging system skyline is discussed. The model is intended to simulate the skyline behavior after a turn of logs breaks out of a "hang-up" on the ground. Output from the model may be used as a forcing function for a dynamic load on the tailspar or other component of the cable logging system.
The numerical model uses finite difference and Runge-Kutta techniques. Output from the model consists of time-histories of the fluctuations in skyline tensions. From this output the frequencies of the skyline vibrations may be determined. The model was verified by experimental data collected while operating a small cable logging system in Oregon State University's McDonald Research Forest
Dynamic Characteristics of a Small Skyline Logging System with a Guyed Tailspar
A series of dynamic loading tests were conducted on a small skyline logging system (15.8 mm [5/8 inch] skyline) operating in a second-growth Douglas fir stand. The tests included free vibration tests and logging tests with turns weighing from 1.5 to 9 kN [340 to 2050 lbs]. Natural frequency and damping were evaluated from free vibration tests, and the free vibration portion of logging tests. Dynamic load magnitude was evaluated for logging tests with natural and artificial breakouts of turns with a range in turn weights, and for a series of logging tests with the same turn. The natural frequencies of the guylines were in good agreement with simple cable theory. However, the presence of the carriage on the skyline resulted in measured natural frequencies significantly lower than simple cable theory would predict. Damping of the tailspar system and the skyline averaged about 10% of critical damping, but was highly variable from test to test. Dynamic load magnitude, whether expressed as the load peak produced by turn break-out, or the maximum cyclic load, was highly variable, with coefficients of variation ranging from 31 to 79%.
Even a series of logging tests with the same two-log turn produced maximum cyclic loads with a coefficient of variation of nearly 40%
Genome Symbols in the Triticeae (Poaceae)
A system for the application of nuclear genome symbols in the tribe Triticeae is proposed. It is based mainly on prevailing symbols. In agreement with this, the system uses individual upper case letters as symbols in the first place. Since the number of basic nuclear genomes in the Triticeae exceeds the number of single letters in the Roman alphabet, some basic genomes are designated with an upper case letter followed by a lower case letter, e.g. Ns for the genome of Psathyrostachys. Superscripts in small letters are used when modified versions of a basic genome are referred to, e.g. HP for the genome found in Hordeum pusillum. Unknown or equivocally identified genomes are designated by X followed by a lower case letter, e.g. Xu for Hordeum murinum. Underline of the relevant genome symbol can be used to indicate the origin of the cytoplasm
On the Use of Ly-alpha Emitters as Probes of Reionization
We use numerical simulations to study the effects of the patchiness of a
partly reionized intergalactic medium (IGM) on the observability of Ly-alpha
emitters (LAEs) at high redshifts (z ~ 6). We present a new model that divides
the Ly-alpha radiative transfer into a (circum-)galactic and an extragalactic
(IGM) part, and investigate how the choice of intrinsic line model affects the
IGM transmission results. We use our model to study the impact of neutral
hydrogen on statistical observables such as the Ly-alpha restframe equivalent
width (REW) distribution, the LAE luminosity function and the two-point
correlation function. We find that if the observed changes in LAE luminosity
functions and equivalent width distributions between z ~ 6 and z ~ 7 are to be
explained by an increased IGM neutral fraction alone, we require an extremely
late and rapid reionization scenario, where the Universe was ~ 40 % ionized at
z = 7, ~ 50 % ionized at z = 6.5 and ~ 100 % ionized at z = 6. This is in
conflict with other observations, suggesting that intrinsic LAE evolution at z
> 6 cannot be completely neglected. We show how the two-point correlation
function can provide more robust constraints once future observations obtain
larger LAE samples, and provide predictions for the sample sizes needed to tell
different reionization scenarios apart.Comment: Accepted for publication in MNRA
- …