Fluorescence-Doped Particles for Simultaneous Temperature and Velocity Imaging

Polystyrene latex microspheres (PSLs) have been used for particle image velocimetry (PIV) and laser Doppler velocimetry (LDV) measurements for several decades. With advances in laser technologies, instrumentation, and data processing, the capability to collect more information about fluid flow beyond velocity is possible using new seed materials. To provide additional measurement capability, PSLs were synthesized with temperature-sensitive fluorescent dyes incorporated within the particle. These multifunctional PSLs would have the greatest impact if they could be used in large scale facilities with minimal modification to the facilities or the existing instrumentation. Consequently, several potential dyes were identified that were amenable to existing laser systems currently utilized in wind tunnels at NASA Langley Research Center as well as other wind and fluid (water) tunnels. PSLs incorporated with Rhodamine B, dichlorofluorescein (DCF, also known as fluorescein 548 or fluorescein 27) and other dyes were synthesized and characterized for morphology and spectral properties. The resulting particles were demonstrated to exhibit fluorescent emission, which would enable determination of both fluid velocity and temperature. They also would allow near-wall velocity measurements whereas laser scatter from surfaces currently prevents near-wall measurements using undoped seed materials. Preliminary results in a wind tunnel facility located at Virginia Polytechnic Institute and State University (Virginia Tech) have verified fluorescent signal detection and temperature sensitivity of fluorophore-doped PSLs

History of Grand Canyon National Park

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Restricted Open-Shell Configuration Interaction Singles Study on M- and L-edge X-ray Absorption Spectroscopy of Solid Chemical Systems

In this study the M- and L-edge X-ray absorption spectra of a series of open- and closed-shell solids (TiO2 rutile, α-Fe2O3 hematite, FeS2 pyrite, and the spinel Co3O4) are investigated with the restricted open-shell configuration interaction singles methods (ROCIS/DFT and PNO-ROCIS/DFT) using the embedded cluster approach. ROCIS/DFT type of methods are grounded in wave function-based ab initio electronic structure theory and have shown great performance in the field of X-ray spectroscopy in particular in the field of transition metal L-edge spectroscopy. In this work we show that ROCIS/DFT can be used to calculate and interpret metal M- and L-edge XAS spectra of solids. To this end, clusters with up to 52 metal centers are considered. In all cases good to excellent agreement between theory and experiment is obtained. The experimentally probed local coordination environments are discussed in detail. The physical origin of the observed spectral features is explored through the machinery of natural difference orbitals. This analysis provides valuable information with respect to the core to valence, metal to metal charge transfer, and metal to ligand charge transfer characters of the relativistically corrected many particle states. The influence of the above electronic effects to the spectral shapes and the size of the treated clusters are thoroughly investigated

A Survey of Conventional and Complementary Therapies Used by Youth With Juvenile-Onset Fibromyalgia

Little is known regarding treatment choices of youth diagnosed with juvenile-onset fibromyalgia (JFM) as they move into young adulthood. Additionally, there is little empirical evidence to guide youth with FM into appropriate treatment options, leading to a variety of therapies used to manage FM symptoms. The purpose of this descriptive study was to examine all therapies used by individuals with JFM as they entered young adulthood and the perceived effectiveness of these treatments. As part of a larger follow-up study, participants completed a web-based survey of all current and past treatments received for FM symptoms 2 years after their initial presentation and diagnosis at a pediatric rheumatology clinic. One hundred ten out of 118 eligible patients participated in the follow-up assessment as young adults (mean age 18.97 years; 93.6% female). A majority of participants reported use of conventional medications (e.g., antidepressants, anticonvulsants) and nondrug therapies (e.g., psychotherapy). Currently and within the past 2 years, antidepressant medications were the most commonly used to manage FM. Complementary treatments were used less often, with massage being the most popular choice. Although currently used treatments were reported as being effective, past treatments, especially medications, were viewed as being more variably effective. This is a potential reason why young adults with JFM might try more complementary and alternative approaches to managing their symptoms. More controlled studies are needed to investigate the effectiveness of these complementary methods to assist treatment providers in giving evidence-based treatment recommendations. © 2013 American Society for Pain Management Nursing

A Survey of Conventional and Complementary Therapies Used by Youth With Juvenile-Onset Fibromyalgia

Little is known regarding treatment choices of youth diagnosed with juvenile-onset fibromyalgia (JFM) as they move into young adulthood. Additionally, there is little empirical evidence to guide youth with FM into appropriate treatment options, leading to a variety of therapies used to manage FM symptoms. The purpose of this descriptive study was to examine all therapies used by individuals with JFM as they entered young adulthood and the perceived effectiveness of these treatments. As part of a larger follow-up study, participants completed a web-based survey of all current and past treatments received for FM symptoms 2 years after their initial presentation and diagnosis at a pediatric rheumatology clinic. One hundred ten out of 118 eligible patients participated in the follow-up assessment as young adults (mean age 18.97 years; 93.6% female). A majority of participants reported use of conventional medications (e.g., antidepressants, anticonvulsants) and nondrug therapies (e.g., psychotherapy). Currently and within the past 2 years, antidepressant medications were the most commonly used to manage FM. Complementary treatments were used less often, with massage being the most popular choice. Although currently used treatments were reported as being effective, past treatments, especially medications, were viewed as being more variably effective. This is a potential reason why young adults with JFM might try more complementary and alternative approaches to managing their symptoms. More controlled studies are needed to investigate the effectiveness of these complementary methods to assist treatment providers in giving evidence-based treatment recommendations. © 2013 American Society for Pain Management Nursing

Shrinking the Synchrotron : Tabletop Extreme Ultraviolet Absorption of Transition-Metal Complexes

We show that the electronic structure of molecular first-row transition-metal complexes can be reliably measured using tabletop high-harmonic XANES at the metal M2,3 edge. Extreme ultraviolet photons in the 50-70 eV energy range probe 3p → 3d transitions, with the same selection rules as soft X-ray L2,3-edge absorption (2p → 3d excitation). Absorption spectra of model complexes are sensitive to the electronic structure of the metal center, and ligand field multiplet simulations match the shapes and peak-to-peak spacings of the experimental spectra. This work establishes high-harmonic spectroscopy as a powerful tool for studying the electronic structure of molecular inorganic, bioinorganic, and organometallic compounds