The application of RFID technology in large-scale dry bulk material transport system monitoring

2011 ◽  
Author(s):  
Yusong Pang ◽  
Gabriel Lodewijks
Keyword(s):  
Transport System ◽  
Large Scale ◽  
Bulk Material ◽  
Rfid Technology ◽  
System Monitoring ◽  
Material Transport

The Use of Microbial Coatings, Nutrients and Chemical Defense Systems in Oyster Restoration

2019 ◽  
Vol 53 (4) ◽  
pp. 39-54
Author(s):  
Thomas J. Manning ◽  
Weldon Lane ◽  
Richard Darren Williams ◽  
Matt Cowan ◽  
Marcus Diaz ◽  
...  
Keyword(s):  
Chemical Defense ◽  
Large Scale ◽  
Bulk Material ◽  
Keystone Species ◽  
Oyster Spat ◽  
Marine Life ◽  
Defense Systems ◽  
Improve Water Quality ◽  
Oyster Restoration ◽  
Potential Use

AbstractMany oyster species are keystone species that help mitigate shoreline erosion, provide habitats for juvenile fishes, and improve water quality. A number of human-driven factors have led to a decline in their populations worldwide. This article focuses on the chemistry of a novel substrate (nutrient-enriched concrete, or NEC) used to induce settlement and colonization of wild diploid oyster spat and is divided into four sections: (1) composition of the bulk material used for oyster restoration, (2) nutrients added to stimulate growth of bacterial and or algal biofilms, (3) nutrients included for the recently settled oyster spat, and (4) the potential use of natural chemical defense systems to control predators and competing marine life. The goal is to develop a material that can be manufactured and used on a large scale.

Atomistic and Continuum Studies of Diffusional Creep and Associated Dislocation Mechanisms in thin Films on Substrates

2003 ◽  
Vol 779 ◽  
Author(s):  
Markus J. Buehler ◽  
Alexander Hartmaier ◽  
Huajian Gao
Keyword(s):  
Thin Films ◽  
Stress Field ◽  
Grain Boundary ◽  
Large Scale ◽  
Strain Relaxation ◽  
Dislocation Dynamics ◽  
Biaxial Stress ◽  
Diffusional Creep ◽  
Material Transport ◽  
Dynamics Simulations

AbstractMotivated by recent theoretical and experimental progress, large-scale atomistic simulations are performed to study plastic deformation in sub-micron thin films. The studies reveal that stresses are relaxed by material transport from the surface into the grain boundary. This leads to the formation of a novel defect identified as diffusion wedge. Eventually, a crack-like stress field develops because the tractions along the grain boundary relax, but the adhesion of the film to the substrate prohibits strain relaxation close to the interface. This causes nucleation of unexpected parallel glide dislocations at the grain boundary-substrate interface, for which no driving force exists in the overall biaxial stress field. The observation of parallel glide dislocations in molecular dynamics studies closes the theory-experiment-simulation linkage. In this study, we also compare the nucleation of dislocations from a diffusion wedge with nucleation from a crack. Further, we present preliminary results of modeling constrained diffusional creep using discrete dislocation dynamics simulations.

Pore-Scale Simulation for Predicting Material Transport Through Porous Media

2002 ◽  
Author(s):  
Goichi Itoh ◽  
Jinya Nakamura ◽  
Koji Kono ◽  
Tadashi Watanabe ◽  
Hirotada Ohashi ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Porous Media ◽  
Parallel Computation ◽  
Large Scale ◽  
Message Passing Interface ◽  
Complex Geometry ◽  
Data Communication ◽  
Porous Media Flow ◽  
Pore Scale ◽  
Material Transport

Microscopic models of real-coded lattice gas automata (RLG) method with a special boundary condition and lattice Boltzmann method (LBM) are developed for simulating three-dimensional fluid dynamics in complex geometry. Those models enable us to simulate pore-scale fluid dynamics that is an essential part for predicting material transport in porous media precisely. For large-scale simulation of porous media with high resolution, the RLG and LBM programs are designed for parallel computation. Simulation results of porous media flow by the LBM with different pressure gradient conditions show quantitative agreements with macroscopic relations of Darcy’s law and Kozeny-Carman equation. As for the efficiency of parallel computing, a standard parallel computation by using MPI (Message Passing Interface) is compared with the hybrid parallel computation of MPI-node parallel technique. The benchmark tests conclude that in case of using large number of computing node, the parallel performance declines due to increase of data communication between nodes and the hybrid parallel computation totally shows better performance in comparison with the standard parallel computation.

Assessment for Monitoring of Education Systems: The U.S. Example

2019 ◽  
Vol 683 (1) ◽  
pp. 58-74
Author(s):  
Erin M. Fahle ◽  
Benjamin R. Shear ◽  
Kenneth A. Shores
Keyword(s):  
United States ◽  
Standardized Tests ◽  
Large Scale ◽  
The United States ◽  
System Monitoring ◽  
National Assessment ◽  
Education Data ◽  
Monitoring Tools ◽  
Monitoring Test ◽  
Race Ethnicity

Standardized tests are regularly used as education system monitoring tools to compare the average performance of students living in different states or belonging to different subgroups (e.g., defined by race/ethnicity, sex, or parental income) and to track their progress over time. This article describes some uses and design features of tests in system monitoring contexts. We provide the example of the National Assessment of Educational Progress (NAEP), the only large-scale system monitoring test in the United States. The availability of NAEP data, in turn, has facilitated the construction of the Stanford Education Data Archive (SEDA), a publicly available database that can be used to describe patterns of achievement for nearly all school districts in the United States. Here, we discuss progress in and challenges to the use of standardized tests as system monitoring tools.

scholarly journals Kinetics and mechanism of planar nanowire growth

2019 ◽  
Vol 117 (1) ◽  
pp. 152-160 ◽  
Author(s):  
Amnon Rothman ◽  
Vladimir G. Dubrovskii ◽  
Ernesto Joselevich
Keyword(s):  
Surface Diffusion ◽  
Large Scale ◽  
Nanowire Growth ◽  
Power Exponent ◽  
Material Transport ◽  
Guided Growth ◽  
Large Scale Integration ◽  
Scale Integration ◽  
And Control ◽  
Kinetics Of

Surface-guided growth of planar nanowires offers the possibility to control their position, direction, length, and crystallographic orientation and to enable their large-scale integration into practical devices. However, understanding of and control over planar nanowire growth are still limited. Here, we study theoretically and experimentally the growth kinetics of surface-guided planar nanowires. We present a model that considers different kinetic pathways of material transport into the planar nanowires. Two limiting regimes are established by the Gibbs–Thomson effect for thinner nanowires and by surface diffusion for thicker nanowires. By fitting the experimental data for the length–diameter dependence to the kinetic model, we determine the power exponent, which represents the dimensionality of surface diffusion, and results to be different for planar vs. nonplanar nanowires. Excellent correlation between the model predictions and the data is obtained for surface-guided Au-catalyzed ZnSe and ZnS nanowires growing on both flat and faceted sapphire surfaces. These data are compared with those of nonplanar nanowire growth under similar conditions. The results indicate that, whereas nonplanar growth is usually dominated by surface diffusion of precursor adatoms over the nanowire walls, planar growth is dominated by surface diffusion over the substrate. This mechanism of planar nanowire growth can be extended to a broad range of material–substrate combinations for higher control toward large-scale integration into practical devices.

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