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The information provided for the Ag-Pb-Sn System consists of five parts: - Diagram: The diagram shows the calculated liquidus projection. Shown are the isotherms and lines of two-fold saturation. - Status: The analytical descriptions of the Gibbs energies of the constituent binaries are combined for each phase and used to predict the multicomponent system. - Sources: Bibliographic information for the thermodynamic descriptions. - Invariant Equilibria: Table with the calculated invariant equilibria of the system. The table lists the phases involved in the reaction, phase compositions and reaction temperature. - Phases: Table with the phases of the system. The table lists the crystal structure, common names of the phases and the model used for the thermodynamic description. Thermodynamic databases allow the compact storage of pha...
Use 1-D cylindrical convection/conduction graphs to estimate temperature difference across an extruded polyethylene rod, and make a design change to reduce that temperature difference (and thus thermal stress).
The focus of this work was to synthesize and characterize poly(propylene carbonate) made from CO2 and propylene oxide. Reactions were conducted in a high-pressure Parr reactor using a double metal cyanide catalyst and a poly(propylene glycol) initiator. The polymers were analyzed using GPC and 1H NMR. It was found that increasing the mol % of initiator in the reaction decreased molecular weight without affecting carbonate percentage. It was also determined that the increase of CO2 pressure in the reaction increased the amount of carbonate units in the polymer, without affecting molecular weight.
In this work we examine the dependence of signal strength on polymer loading and how it is affected by selected sample preparation factors.
Schematic of periodic boundary conditions. When using periodic boundary conditions, a particle which exits the system on the right, will reappear on the left. In the schematic, our simulation volume is colored in red. As the yellow particle exits on the right, it will re-enter on the left. This can be thought of as having identical simulation boxes surrounding the system. As the yellow particle enters the next simulation on the right, a particle from the periodic image on the left will enter.
In dealing with systems containing widely disparate species population levels, such as arise in cellular biology and nanoscale semiconductor processing, there is a growing need for multiscale simulation techniques that can efficiently handle behaviors at both the conventional deterministic-continuum level as well as the mesoscopic level of description. We present here an exciting novel method for modeling the population dynamics that integrates the mesoscopic and macroscopic process levels seamlessly and automatically and can handle systemsacross multiple timescales with minimal user intervention.
Electrophoresis of linear and branched rigid-rod (≤ 60 base pairs) DNA is studied in a linear polyacrylamide (LPA) – agarose hybrid gel in order to investigate the behavior of LPA chains in close proximity to the translating analyte. Experimental results suggest that polymer chains present within the Debye layer of the DNA is subjected to shear-thinning.
Calculate flow velocity profile of an adhesive monomer flowing down an inclined plane, and describe the rate and boundary layer structure of mass transfer of water molecules (which might initiate polymerization) into the adhesive.
Fluorescence screening is an innovative technique for fuel cell anode catalyst discovery and development that allows for the rapid detection of catalytically active materials[1]. Potential catalysts are tested simultane- ously, and catalytic activity is indicated by the forma- tion of visible fluorescence. The present parallel screening method allows for the quantification of fluorescence with respect to the potential applied to the catalysts. However, the conventional measure of catalytic activity is in terms of current density. By analyzing a stable catalytically active region of known size and composition under varying current and potential conditions, we investigate the relationship between current and fluorescence intensity in our electrochemical setup under several testing conditions.
Molecular Dynamics simulation of a Dzugutov system showing dodecagonal quasicrystalline behavior. Dodecagonal quasicrystals have 12-fold symmetry.
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