The softening of the radial breathing mode (RBM) of metallic single walled carbon nanotubes (m-SWNTs) due to electron-phonon coupling has been studied by observing the Fermi level (ϵF) dependence of the RBM Raman peak...
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The softening of the radial breathing mode (RBM) of metallic single walled carbon nanotubes (m-SWNTs) due to electron-phonon coupling has been studied by observing the Fermi level (ϵF) dependence of the RBM Raman peak. In situ Raman spectra were obtained from several individual m-SWNTs while varying ϵF electrochemically. The RBM frequency of an intrinsic m-SWNT is shown to be down-shifted relative to highly doped tubes by ∼2 cm−1. The down-shift is greatest for small diameter and small chiral angle SWNTs. Most tubes show no change in RBM linewidth. A comparison is drawn between the RBM and the G band (ALO phonon) with respect to the ϵF dependence of their frequencies and linewidths.
The effect of different arsenic species (As 2 or As 4 ) on the quality of molecular beam epitaxy (MBE) grown GaNAsSb materials (samples A and B) and GaAs/ GaNAsSb/GaAs p + n - n + devices (samples C and D) were inve...
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The effect of different arsenic species (As 2 or As 4 ) on the quality of molecular beam epitaxy (MBE) grown GaNAsSb materials (samples A and B) and GaAs/ GaNAsSb/GaAs p + n - n + devices (samples C and D) were investigated. The improvement in material quality in sample B, as well as the improvement in diode and solar cell characteristics in sample C, may suggest a successful defect density manipulation using As 2 overpressure for GaNAsSb growth.
We use a system model of a cell and approximate magnitudes of electrical incapacitation (EI) device waveforms to estimate conditions that lead to responses with or without electroporation (EP) of cell membranes near e...
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We use a system model of a cell and approximate magnitudes of electrical incapacitation (EI) device waveforms to estimate conditions that lead to responses with or without electroporation (EP) of cell membranes near electrodes. Single pulse waveforms of Taser X26 and Aegis MK63 devices were measured using a resistive load. For the present estimates the digitized waveforms were scaled in magnitude according to the inverse square radial distance from two tissue-penetrating electrodes, approximated as hemispheres. The corresponding tissue level electric fields were then used as inputs to the cell system model. A dynamic pore model for membrane electroporation (EP) was assigned to many different sites on the cell plasma membrane (PM). EI devices generate sufficiently large transmembrane voltage, U m (t), such that pores were created, evolving into a heterogeneous and time-dependent pore population. These approximate responses suggest that both waveforms can cause PM EP. Peripheral nerve damage by EP is a candidate side effect. More extensive EP is expected from the Taser X26 than the Aegis MK63, mainly due to the approximately eight-fold difference in the peak magnitudes. In silico examination of EI waveforms by multiscale modeling is warranted, and can involve whole body, tissue and cell level models that now exist and are rapidly being improved.
We have successfully experimentally integrated graphene interconnects with commercial 0.25 ¿m technology CMOS ring oscillator circuit using conventional fabrication techniques, and demonstrated high speed on-chip...
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ISBN:
(纸本)9781424456390
We have successfully experimentally integrated graphene interconnects with commercial 0.25 ¿m technology CMOS ring oscillator circuit using conventional fabrication techniques, and demonstrated high speed on-chip graphene interconnects that operates above 1 GHz.
We present a theoretical model describing Ogston (pore size comparable to or larger than the characteristic molecular dimension) sieving of rigid isotropic and anisotropic biomolecules in nanofluidic molecular filter ...
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We present a theoretical model describing Ogston (pore size comparable to or larger than the characteristic molecular dimension) sieving of rigid isotropic and anisotropic biomolecules in nanofluidic molecular filter arrays comprising of alternating deep and shallow regions. Starting from a quasi-one-dimensional drift-diffusion description, which captures the interplay between the driving electric force, entropic barrier and molecular diffusion, we derive explicit analytical results for the effective mobility and trapping time. Our results elucidate the effects of field strength, device geometry and entropic barrier height, providing a robust tool for the design and optimization of nanofilter/nanopore systems. Specifically, we show that Ogston sieving becomes negligible when the length of shallow region becomes sufficiently small, mainly due to efficient diffusional transport through the short shallow region. Our theoretical results are in line with experimental observations and provide important design insight for nanofluidic systems.
Due to a strong electrokinetic response inside an ion depletion region created by concentration polarization (CP), the velocity of non-equilibrium electroosmotic flows (EOF) inside the ion depletion zone can be ∼10 t...
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We developed a simple integration method of polymeric nanostructure in a poly-dimethylsiloxane (PDMS)-based microfluidic channel. The Nafion polymer or charged particle creased by infiltrating solution between the gap...
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High-precision maneuvers at high angles-of-attack are not properly addressed by even the most advanced aircraft control systems. Here we present our control design procedure and indoor experimental results with a smal...
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