Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"charge effects"”.
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Molecular Size and Charge Effects on Nucleocytoplasmic Transport Studied By Single-Molecule Microscopy
… transport selectivity through the NPCs is the charges of the transiting molecules. Previously it was suggested that the positively charged FG-Nups form a selective barrier which would inhibit the transport of positively charged cargoes unless they are chaperoned by negatively charged transport …
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Transport of elliptic intense charged -particle beams
The transport theory of high-intensity elliptic charged-particle beams is presented. In particular, the halo formation and beam loss problem associated with the high space charge and small-aperture structure is addressed, and a novel transport theory of large-aspect-ratio elliptic beams has been …
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Space-Charge Saturation and Current Limits in Cylindrical Drift Tubes and Planar Sheaths
Space-charge effects play a dominant role in many areas of physics. In high-power microwave devices using high-current, relativistic electron beams, it places a limit on the amount of radiation a device can produce. Because the beam's space-charge can actually reflect a portion of the beam, the …
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INFLUENCE OF ELECTROSTATIC CHARGE UPON THE DEPOSITION BEHAVIOR OF PHARMACEUTICAL AEROSOLS WITHIN CASCADE IMPACTORS
… aerosols, are calibrated using dilute, charge-neutralized, monodisperse aerosols. But pharmaceutical aerosols are known to generate concentrated, inherently charged, polydisperse aerosol clouds. A computational model of the Andersen Cascade Impactor (ACI) suggested that the presence of …
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Experimentally validated models of refrigerant distribution in microchannel heat exchangers used to evaluate charge reduction of various working fluids
… of microchannel heat exchanger performance and charge. Effects of using various correlations are presented and discussed with focus on microchannel condensers and evaporators. Experiments with different refrigerants including R290, R717, R1234yf, and R134a are used to validate the models. The …
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The optical properties of oxide films on copper and copper alloys
… changes of the oxide are attributed to space-charge effects existing at the substrate/oxide interface.
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Mathematical models for interendothelial cleft
… by cAMP. The other is to examine the charge effects of surface glycocalyx on microvessel permeability; To investigate the microstructural mechanisms of decreasing microvascular permeability induced by the enhancement of intraendothelial adenosine 3 ',5'-cyclic monophosphate (CAMP) …
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Simulation of multiple-component charged aerosol evolution
… dispersion, coagulation (considering charge effects) and condensation, assuming a spatially homogeneous medium and spherical particles. Two problems with different particle compositions were simulated to obtain information about the interactions through the different processes and the …
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Ultrafast carrier dynamics and enhanced electroabsorption in (gallium,indium)arsenide/(aluminum,indium)arsenide asymmetric double quantum well structures
… consistent with phase-space filling and space-charge effects blocking tunneling carriers. The fast transfer of electrons was confirmed to be a LO-phonon assisted process. A detailed theoretical study of ultrafast hole tunneling at low carrier densities indicates that in ternary materials alloy …
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Determination of space charge characteristics on contaminated XLPE insulator
… Many studies had been done to identify effects of pollutant towards XLPE insulator performance and has showed various results on it. However, effect of mineral layer on space charge on underground XLPE insulator remain unanswered. These minerals Silicone Dioxide, Titanium Dioxide and …
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Experimental investigation of electron multipactor discharges at very high frequency
Multipactor discharges are a resonant condition in which electrons impact a surface in phase with an alternating electric field. The discharge is sustained by electron multiplication from secondary emission. As motivation, multipactor discharges can adversely affect many different rf systems in …
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Analysis and Chemical Applications of Metal–Metal Bonds and Large Language Models
… complexes were developed to probe second–sphere charge effects, revealing a quantifiable relationship between ligand charge and Mo≣Mo redox behavior. Building on this platform, a quadruply bonded dimolybdenum–based organometallic additive was introduced into a NaPF₆/dimethyl carbonate electrolyte …
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Thermally stimulated polarization and depolarization current (TSPC/TSDC) in glass
… <10<sup>-12</sup> (Ω·cm)<sup>-1</sup> . Space charge effects are easily detected and avoided.</p> <p>Sodium ion motion in three sodium silicate glasses and a sodium aluminosilicate glass has been investigated by the thermally stimulated polarization (TSPC) and depolarization (TSDC) current …
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Nanoparticles for Oil Dispersants and Nano Tracers
… behavior. Transport behavior of negatively charged carbon nanoparticles in porous rock cores was also examined using single phase core flooding experiments and 1-dimesional convection-dispersion equation. Temperature dependence of transport parameters such as dispersion coefficients and …
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Numerical Analysis of Respiratory Aerosol Deposition: Effects of Exhalation, Airway Constriction and Electrostatic Charge
… aerosol transport. Objective I: Considering the effects of mesh type and grid convergence, four commonly implemented mesh styles were applied to a double bifurcation respiratory geometry and tested for flow patterns and aerosol deposition. Results indicated that the mesh style employed had a …
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Enhancement of fluidization and filtration using nanoparticle agglomerates and aerogels
… presence of pressure fluctuations, electrostatic charge effects, magnetic, vibration and centrifugal (in a rotating fluidized bed) assisted fluidization, jet assisted fluidization and mass transport rates during humidification and drying of hydrophilic fluidized nanopowders. The research on jet …
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Inductively coupled plasma mass spectrometry with a twin quadrupole instrument using laser ablation sample introduction and monodisperse dried microparticulate injection
… edge of the Li+ signal becomes apparent. Space charge effects are consistent with the disturbances seen. A model for this behavior is proposed. In this model, deflection of Li+ by space charge causes part of the ion cloud to be driven ahead of the Pb+ and part to be trapped behind the Pb+ cloud …
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Design and Study of an Electron Beam System for Silicon Recrystallization
… analytical model were used to investigate space charge effects in the electron beam recrystallizer and to optimize the design of a three-lens electron optical system which would work under variable demagnification conditions and at nearly 100 % beam current transmission. The performance of the …
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Solution and Adsorption Characterization of Novel Water-Soluble Ionic Block Copolymers for Stabilization of Magnetite Nanoparticles
… and densiometry. Under conditions when the charge is suppressed such as at low pH and/or high ionic strength, the polymer chains self-assemble into micelles, whereas unimers alone are present under conditions where charge effects are important, such as high pH and low ionic strength. A model …
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