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Here we present laser based readout and control of the Brownian motion of a thin film of superfluid helium formed around an optical microresonator. Detuned laser driving allows photothermal induced laser cooling and heating, while amplitude modulation probes the nonlinear Duffing interaction.
Cavity optomechanics allows the first direct observation of superfluid thermodynamical motion. Laser cooling and strong quartic nonlinearities are both observed, enabling prospective applications in quantum engineering, precision sensing, and studies of emergent quantum phenomena.
The fundamental mechanisms of iron impurities in silicon have been thoroughly studied and are well explained in the literature. Of interest to solar cell manufacturers is to understand how these mechanisms manifest in a production environment and, more importantly, how to quickly diagnose and mitigate iron contamination as it occurs. This paper presents examples of iron contamination using p-type...
We present the results of a simple, low-cost microfluidic device that can be used to isolate and capture circulating tumor cells (CTCs) from whole blood. The device was made from polydimethylsiloxane (PDMS) consisting of a microfluidic channel with microposts coated with ligand proteins. A total of 32 devices were designed, each containing different patterns in terms of shape, size, spacing, and arrangement...
A high temperature MEMS flow control device is developed to modulate the effluent of the gas chromatography (GC) column. The noise of electroantennogram (EAG) is reduced dramatically with the MEMS enabled chopper stabilization of the analytes and subsequent demodulation of the recorded EAG signal. With the MEMS-GC-EAG technology, the signal-to-noise ratio for detecting green leafy volatile is improved...
We report the generation of a supercontinuum spanning over 1260–2200 nm in a 10 cm long As2Se3 wire pumped at 1550 nm, by avoiding the effects of two-photon absorption normally observed at this pump wavelength.
In this paper we describe the Denovo code system. Denovo solves the six-dimensional, steady-state, linear Boltzmann transport equation, of central importance to nuclear technology applications such as reactor core analysis (neutronics), radiation shielding, nuclear forensics and radiation detection. The code features multiple spatial differencing schemes, state-of-the-art linear solvers, the Koch-Baker-Alcouffe...
We describe a one dimensional model for isotextured silicon solar cells. Combined optical and recombination analyses provide the tools required to predict the performance of isotextured cells; the utility of these tools is demonstrated by comparison with industrially fabricated screen-printed cells with full area back surface field. In this particular demonstration, inaccurate predetermination of...
Ultra high frequency (UHF) partial discharge sensors are important tools for condition monitoring and fault location in high voltage equipment. There are many designs of UHF sensors which can detect electromagnetic waves that radiate from partial discharge sources. The general types of UHF PD sensors are disc, monopole, probe, spiral, and conical types with each type of sensor having different characteristics...
Pattern recognition techniques can be applied to problems in medicine to aid diagnostic accuracy and uncover patterns associated with disease states that are not always obvious to the clinician. In this work, a sequential forward floating search technique (SFFS) was applied to the problem of classification of patients with Alzheimer's disease (AD), mild cognitive impairment (MCI) and normal controls...
The freeware program OPAL 2 computes the optical losses associated with the front surface of a Si solar cell. It calculates the losses for any angle of incidence within seconds, where the short computation time is achieved by decoupling the ray tracing from the Fresnel equations. Amongst other morphologies, OPAL 2 can be used to assess the random-pyramid texture of c-Si solar cells, or the ‘isotexture’...
This paper discusses the current practice for selecting high voltage insulators and the changes needed to accommodate Load Resistance Factor Design. Conversion of insulator rated strength, defined according to ANSI C29 Standards, to damage limit strength to provide the service limit resistance required by LRFD is discussed. Specific values of service limit resistance and strength factors for different...
This paper overviews the design changes necessary to convert an AVS-22 electric bus to an in-vehicle component testbed. These changes include the addition of a data acquisition system and a modular control system that will be adaptable with changing components. The majority of this paper discusses the need for the bus to climb 25% grades, and how battery chemistry significantly affects hill climb...
At NRL, we are involved in the research and development of specialty infrared optical fibers, glasses, ceramics, and thin films. We have state-of-the-art facilities for making high purity chemicals and unique optical materials of high quality, which are being exploited in optical devices and systems for Navy and DoD applications. One of the core scientific areas that we have pioneered is based primarily...
One of the obstacles to widespread deployment of phase-resolved partial discharge (PD) diagnostics is the complexity of deploying and operating new monitoring systems. Typically, these rely upon synchronization with the electrical system frequency via a power line connection, introducing cost, inconvenience and risk into the system. For utilities to exploit partial discharge monitoring on a wide scale,...
Photoluminescence (PL) imaging is used to identify a contamination source that is introduced during a thermal oxidation of crystalline p-type silicon. The PL images indicate that the contamination severely decreases the carrier lifetime from ∼350 ms to 50 ms, and that it is localised and radially symmetric with a diameter of ∼10 mm. By taking PL images before and after the wafers are ‘light-soaked’,...
We present a methodology by which one may distinguish three key contributors to enhanced recombination at pyramidally textured silicon surfaces. First, the impact of increased surface area is trivial, and equates to a 1.73-fold increase in Seff, UL. Second, the presence of {111}-oriented facets drives a 5-fold increase in Seff, UL at SiO2 passivated surfaces, but a small (1.5-fold) increase for SiN...
At the nanoscale, the optomechanical coupling increases thanks to a reduced optical/mechanical interaction volume and reduced mass of the mechanical oscillator [1,2]. In the context of nano-optomechanics, semiconductors like GaAs offer many assets. First their large refractive index allows confining optical energy in sub-wavelentgh sized high-Q cavities. Second, nanoscale mechanical oscillators are...
Rich information on mutations and their impacts is scattered across scientific texts and literature. Reuse of mutation impact annotations requires grounding mutations to the correct positions on sequences extracted from protein databases as a critical step. This paper presents a generic method for grounding textual mentions of mutation entities to protein sequences, that is based on an OWL-DL ontology...
The ChEss project of the Census of Marine Life (2002–2010) helped foster internationally-coordinated studies worldwide focusing on exploration for, and characterization of new deep-sea chemosynthetic ecosystem sites. That work advanced our understanding of the nature of factors controlling the biogeography and biodiversity of these ecosystems in four geographic locations: the Atlantic Equatorial Belt,...
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