transport process

Machining and processing activities (and mining activities for U) produce particulate U and Pu, which can be transported in air as fine material, and physically in soil and water through various physical and biological transport processes. Dissolved U and Pu can be produced by chemical processing, leaching, or weathering of particulates, especially for U. Uranium is transported in groundwater primarily as dissolved U(VI). The dissolved species depends strongly upon the solution pH and dissolved carbonate concentration, as well as other aspects of water chemistry and substrate properties along the transport - pathways. In general, UO2 2+ dominates in waters less than pH 6, UO2OH + and (UO2)2CO3(OH)3 in waters in equilibrium with atmospheric CO2 between pH 6 and 7, and UO2(CO3)2 2- and UO2(CO3)3 4- in most waters above pH 7, and in carbonate-rich waters above pH 6. Pu chemistry is more complex. Depending upon redox and pH conditions, Pu is able to exist in 3 or 4 oxidation states in n...

This research focus on factors influences air freight transport of FedEx Corporation in the U.S. in 2016 as it would be developed more as countries turn to merge with each other to change the global economy better and meet customers’ need. This type of transport is flexible enough to guarantee transport processes and ensure one-time and periodic round-the-clock goods deliveries to remote and low-density areas. Additionally, it can also be applied secure service to prevent downtime in the work of companies and avoid stock deficiency as well as can carry lots of relatively small goods with small intervals satisfying the changing demands of the customers. Although there’re still some limitations in this research, all of the economists can find and develop this career better when people are participating in the 4th Industrial Revolution based on the case study of FedEx Corporation in air transport field.
Keywords: FedEx, transport process, lead-time

Recent advances and avenues for further research and development in three specific fields of membrane science and technology are reviewed. The potential of membrane processes for gas separation has been considerably improved by the development of new materials combining high permeability and selectivity. While working correlations between polymer structure and permeation characteristics have been evolved, there is need to further

An exact analytical expression for the effective diffusion coefficient of an overdamped Brownian particle in a tilted periodic potential is derived for arbitrary potentials and arbitrary strengths of the thermal noise. Near the critical tilt (threshold of deterministic running solutions) a scaling behavior for weak thermal noise is revealed and various universality classes are identified. In comparison with the bare

A 0-D (box type) mathematical flushing model and a three-dimensional baroclinic numerical model have been presented that are used to simulate transport processes in coastal waters. The numerical model consists of hydrodynamic, transport and turbulence model components. In the hydrodynamic model component, the Navier-Stokes equations are solved with the Boussinesq approximation. The transport model component consists of the pollutant transport

The influence of intracellular and extracellular protein binding on the hepatic storage and biliary elimination of dibromosulfophthalein (DBSP) was studied in isolated perfused rat liver. Under first order kinetic conditions the amount of DBSP in the liver at a given plasma concentration (hepatic storage) was determined by extracellular binding to albumin and intracellular binding to the cytosolic Y and Z proteins as well as concentrative membrane transport from plasma into the liver. At higher doses, extensive binding of DBSP to intracellular organelles also occurred while liver cytosol/plasma concentration gradients of unbound DBSP were much lower. Hepatic storage increased with decreasing albumin concentration in the perfusate of isolated perfused rat livers. However, it was shown that this parameter is dose-dependent, and errors can be introduced in its calculation if nonlinearity of sinusoidal and canalicular transport processes as well as nonlinear protein binding are not taken into account. The influence of another organic anion, indocyanine green (ICG) on the hepatic storage, subcellular distribution, and elimination of DBSP was subsequently studied. At equimolar amounts the presence of ICG resulted in a 50% decrease in hepatic clearance and hepatic distribution volume of DBSP. It was inferred that these changes are due to an inhibition of carrier-mediated transport across the sinusoidal and canalicular membrane and preferential displacement from intracellular binding sites. In contrast DBSP in equimolar amount enhanced the initial disappearance rate and biliary excretion of ICG, probably due to increasing its free fraction in plasma. It is concluded that the level and mechanism of interaction of two drugs within the eliminating organ can be characterized by combining clearance studies with data on subcellular and extracellular binding.

We here reconstruct the past change of the East Asian monsoon since 20 Ma using samples from Ocean Drilling Program (ODP) Site 1146 in the northern South China Sea based on a multi-proxy approach including a monomineralic quartz isolation procedure, identification of clay minerals by X-ray Diffraction (XRD) and grain-size analysis of isolated terrigenous materials. Terrigenous supply to ODP Site 1146 was dominated by changes in the strength of multiple sources and transport processes. Grain-size data modeled by an end-member ...

Laminar natural convection has been studied in a laterally heated vertical cylindrical enclosure with a free insulated surface and a centrally located constant temperature wall at the top. These conditions are a simplification of the conditions existing in a Czochralski ...

We present experimental measurements of the mean energy in the vicinity of the first and second quantum resonances of the atom-optics kicked rotor for a number of different experimental parameters. Our data are rescaled and compared with the one-parameter (gamma) classical scaling function developed to describe the quantum resonance peaks. Additionally, experimental data are presented for the ``classical'' resonance which

In systems possessing spatial or dynamical symmetry breaking, Brownian motion combined with symmetric external input signals, deterministic or random, alike, can assist directed motion of particles at the submicron scales. In such cases, one speaks of "Brownian motors". In this review the constructive role of Brownian motion is exemplified for various one-dimensional setups, mostly inspired by the cell molecular machinery: working principles and characteristics of stylized devices are discussed to show how fluctuations, either thermal or extrinsic, can be used to control diffusive particle transport. Recent experimental demonstrations of this concept are reviewed with particular attention to transport in artificial nanopores and optical traps, where single particle currents have been first measured. Much emphasis is given to two- and three-dimensional devices containing many interacting particles of one or more species; for this class of artificial motors, noise rectificat...

There is growing evidence that water seepage in thick unsaturated zones in fractured rocks may occur in non-volume-averaged fashion, as relatively 'slow' flow in the rock matrix, and 'fast' flow along localized preferential pathways in fractures. This poses difficult challenges for ...

A study of the transport coefficients of a system of elastic hard disks, based on the use of Helfand-Einstein expressions is reported. The pressure, the viscosity, and the heat conductivity are examined for different density and system-size. While most transport coefficients agree with Enskog theory below the disorder-order transition, a striking power law divergence of the viscosity with density is obtained at this density. The other transport coefficients show a drop in that density regime, relative to the Enskog theoretical prediction. The deviations are related to shear band instabilities and the contept of dilatancy.