66 research outputs found
A study of poultry processing plant noise control techniques
A number of techniques can be used to reduce noise in poultry processing plants. In general, covering the ceiling with a noise-absorbing medium is a practical first step. Once the reflected noise levels are abated, treatment of specific identifiable noise courses can take place. The development, flammability, and mechanical properties of acoustic panels to be vertically suspended from the ceiling are discussed as well as the covers need to comply with USDA cleanability requirements. The isolation of drive motors and pumps from large expansive areas, the muffling of pneumatic devices, and the insulation of ice chutes are methods of source quieting. Proper maintenance of machinery and vibration monitoring are also needed to reduce hearing damage risk and to improve worker productivity and employee/supervisor relations
Particlization in hybrid models
In hybrid models, which combine hydrodynamical and transport approaches to
describe different stages of heavy-ion collisions, conversion of fluid to
individual particles, particlization, is a non-trivial technical problem. We
describe in detail how to find the particlization hypersurface in a 3+1
dimensional model, and how to sample the particle distributions evaluated using
the Cooper-Frye procedure to create an ensemble of particles as an initial
state for the transport stage. We also discuss the role and magnitude of the
negative contributions in the Cooper-Frye procedure.Comment: 18 pages, 28 figures, EPJA: Topical issue on "Relativistic Hydro- and
Thermodynamics"; version accepted for publication, typos and error in Eq.(1)
corrected, the purpose of sampling and change from UrQMD to fluid clarified,
added discussion why attempts to cancel negative contributions of Cooper-Frye
are not applicable her
Visual cavity analysis in molecular simulations
Molecular surfaces provide a useful mean for analyzing interactions between biomolecules; such as identification and characterization of ligand binding sites to a host macromolecule. We present a novel technique, which extracts potential binding sites, represented by cavities, and characterize them by 3D graphs and by amino acids. The binding sites are extracted using an implicit function sampling and graph algorithms. We propose an advanced cavity exploration technique based on the graph parameters and associated amino acids. Additionally, we interactively visualize the graphs in the context of the molecular surface. We apply our method to the analysis of MD simulations of Proteinase 3, where we verify the previously described cavities and suggest a new potential cavity to be studied
Convolution surfaces with varying radius: Formulae for skeletons made of arcs of circles and line segments
International audienceWe develop closed form formulae for the computation of the defining fields of convolutions surfaces. The formulae are obtained for power inverse kernels with skeletons made of line segments or arcs of circle. To obtain the formulae we use Creative Telescoping and describe how this technique can be used for other families of kernels and skeleton primitives. We apply the new formulae to obtain convolution surfaces around skeletons, some of them closed curves. We showcase how the use of arcs of circles greatly improves the visualization of the surface around a general curve compared with a segment based approach
SUBDIVISION SURFACES FOR FAST APPROXIMATE IMPLICIT POLYGONIZATION
We propose a fast method of generating an approximate polygonal mesh
from an implicit surface. Current workstations are still not capable of
producing polygon meshes fast enough for the interactive modeling of complex
implicit models. We propose a hybrid method that combines current implicit
polygonization techniques with the faster sub-division surface technique
applied as a post-process to smooth the implicit mesh. In an interactive
environment the smooth mesh points can be migrated to the implicit surface, in
idle moments when the user is not interacting with the model. The technique
can be further enhanced by providing tools for the user to indicate areas of
interest that can be preferentially smoothed.We are currently acquiring citations for the work deposited into this collection. We recognize the distribution rights of this item may have been assigned to another entity, other than the author(s) of the work.If you can provide the citation for this work or you think you own the distribution rights to this work please contact the Institutional Repository Administrator at [email protected]
ANALYSIS OF AN ALGORITHM FOR FAST RAY TRACING USING UNIFORM SPACE SUBDIVISION
Ray tracing is becoming popular as the best method of rendering high
quality images from three dimensional models. Unfortunately, the
computational cost is high. Recently, a number of authors have
reported on ways to speed up this process by means of space
subdivision which is used to minimize the number of intersection
calculations. We describe such an algorithm together with an
analysis of the factors which affect its performance. The critical
operation of skipping an empty space subdivision can be done very
quickly, using only integer addition and comparison. A theoretical
analysis of the algorithm is developed. It shows how the space and
time requirements vary with the number of objects in the scene.We are currently acquiring citations for the work deposited into this collection. We recognize the distribution rights of this item may have been assigned to another entity, other than the author(s) of the work.If you can provide the citation for this work or you think you own the distribution rights to this work please contact the Institutional Repository Administrator at [email protected]
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