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https://www.readbyqxmd.com/read/27914291/influence-of-laser-power-on-atom-probe-tomographic-analysis-of-boron-distribution-in-silicon
#1
Y Tu, H Takamizawa, B Han, Y Shimizu, K Inoue, T Toyama, F Yano, A Nishida, Y Nagai
The relationship between the laser power and the three-dimensional distribution of boron (B) in silicon (Si) measured by laser-assisted atom probe tomography (APT) is investigated. The ultraviolet laser employed in this study has a fixed wavelength of 355nm. The measured distributions are almost uniform and homogeneous when using low laser power, while clear B accumulation at the low-index pole of single-crystalline Si and segregation along the grain boundaries in polycrystalline Si are observed when using high laser power (100pJ)...
November 25, 2016: Ultramicroscopy
https://www.readbyqxmd.com/read/27913397/prospective-study-of-ultraviolet-radiation-exposure-and-thyroid-cancer-risk-in-the-united-states
#2
Rachel D Zamoiski, Elizabeth K Cahoon, D Michal Freedman, Martha S Linet, Cari M Kitahara
BACKGROUND: Thyroid cancer incidence has tripled in the past three decades, yet relatively few risk factors have been identified. Some studies have suggested that ultraviolet radiation (UVR) may affect thyroid cancer risk. METHODS: We conducted a prospective analysis of 44,039 participants in the United States Radiologic Technologists study (153 thyroid cancer cases) from all 50 states. We examined the association between risk of thyroid cancer and exposure to UVR, estimated by ambient UVR, time outdoors, and a combined variable...
December 2, 2016: Cancer Epidemiology, Biomarkers & Prevention
https://www.readbyqxmd.com/read/27911466/transparent-nanofibrous-mesh-self-assembled-from-molecular-legos-for-high-efficiency-air-filtration-with-new-functionalities
#3
Varun Kumar Singh, Sai Kishore Ravi, Wanxin Sun, Swee Ching Tan
Alarming levels of particulate matter pollution in air pose a serious health threat in several countries, therefore intriguing a strong need for an economic and a viable technology of air filtration. Current air purification technology is rather expensive with certain types even having the risk of emitting hazardous by-products. The authors have developed a multifunctional air filter inspired from the nasal hairs possessing an ability to specifically trap/exhale the foreign particles and allergens while still letting the air flow...
December 2, 2016: Small
https://www.readbyqxmd.com/read/27911413/fabricating-a-uv-vis-and-raman-spectroscopy-immunoassay-platform
#4
Cynthia Hanson, Nathan D Israelsen, Michael Sieverts, Elizabeth Vargis
Immunoassays are used to detect proteins based on the presence of associated antibodies. Because of their extensive use in research and clinical settings, a large infrastructure of immunoassay instruments and materials can be found. For example, 96- and 384-well polystyrene plates are available commercially and have a standard design to accommodate ultraviolet-visible (UV-Vis) spectroscopy machines from various manufacturers. In addition, a wide variety of immunoglobulins, detection tags, and blocking agents for customized immunoassay designs such as enzyme-linked immunosorbent assays (ELISA) are available...
November 10, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27911365/low-energy-cathodoluminescence-for-oxy-nitride-phosphors
#5
Yujin Cho, Benjamin Dierre, Takashi Sekiguchi, Takayuki Suehiro, Kohsei Takahashi, Takashi Takeda, Rong-Jun Xie, Yoshinobu Yamamoto, Naoto Hirosaki
Nitride and oxynitride (Sialon) phosphors are good candidates for the ultraviolet and visible emission applications. High performance, good stability and flexibility of their emission properties can be achieved by controlling their composition and dopants. However, a lot of work is still required to improve their properties and to reduce the production cost. A possible approach is to correlate the luminescence properties of the Sialon particles with their local structural and chemical environment in order to optimize their growth parameters and find novel phosphors...
November 15, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27910772/structural-characterization-and-immunological-activities-of-a-novel-water-soluble-polysaccharide-from-the-fruiting-bodies-of-culinary-medicinal-winter-mushroom-flammulina-velutipes-agaricomycetes
#6
Ting Feng, Wei Jia, Wen-Han Wang, Chi-Chung Lin, Hua Fan, Jing-Song Zhang, Hai-Ying Bao
A water-soluble polysaccharide, designated FVPA2, was isolated from the fruiting bodies of Flammulina velutipes using DEAE Sepharose Fast Flow and gel-permeation chromatography. Its structure was elucidated by monosaccharide composition and methylation analysis, ultraviolet, Fourier transform infrared spectrometry, and nuclear magnetic resonance spectroscopy. Results showed that FVPA2 was a homogeneous heteropolysaccharide containing galactose, fucose, and mannose in a molar ratio of 5:1:1. High-performance liquid chromatography indicated its molecular weight as 3...
2016: International Journal of Medicinal Mushrooms
https://www.readbyqxmd.com/read/27910665/up-down-asymmetry-measurement-of-tungsten-distribution-in-large-helical-device-using-two-extreme-ultraviolet-euv-spectrometers
#7
Y Liu, S Morita, X L Huang, T Oishi, M Goto, H M Zhang
Two space-resolved extreme ultraviolet spectrometers working in wavelength ranges of 10-130 Å and 30-500 Å have been utilized to observe the full vertical profile of tungsten line emissions by simultaneously measuring upper- and lower-half plasmas of LHD, respectively. The radial profile of local emissivity is reconstructed from the measured vertical profile in the overlapped wavelength range of 30-130 Å and the up-down asymmetry is examined against the local emissivity profiles of WXXVIII in the unresolved transition array spectrum...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910593/responsivity-calibration-of-the-loweus-spectrometer
#8
J K Lepson, P Beiersdorfer, R Kaita, R Majeski, D Boyle
We performed an in situ calibration of the relative responsivity function of the Long-Wavelength Extreme Ultraviolet Spectrometer (LoWEUS), while operating on the Lithium Tokamak Experiment (LTX) at Princeton Plasma Physics Laboratory. The calibration was accomplished by measuring oxygen lines, which are typically present in LTX plasmas. The measured spectral line intensities of each oxygen charge state were then compared to the calculated emission strengths given in the CHIANTI atomic database. Normalizing the strongest line in each charge state to the CHIANTI predictions, we obtained the differences between the measured and predicted values for the relative strengths of the other lines of a given charge state...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910536/experimental-study-on-the-fluorescence-spectrum-in-the-near-ultraviolet-and-visible-regions-of-a-carbon-dioxide-gas-cerenkov-medium
#9
Xingyin Guan, Huasi Hu, Zhaohui Song, Hetong Han
We investigated the faint fluorescence spectrum of carbon dioxide in the near-ultraviolet and visible regions using an intense relativistic electron beam accelerator with an energy of 0.2-0.3 MeV. Monte Carlo simulations were carried out in advance to maximize the signal-to-noise ratio and a self-normalization pulse experimental layout was designed to overcome the shot-to-shot fluctuations in different pulses of the accelerator. Ultimately, the relative proportion sequences in the near-ultraviolet and visible regions of a carbon dioxide fluorescence spectrum were successfully obtained for the first time...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910534/upgrade-of-the-tangentially-viewing-vacuum-ultraviolet-vuv-telescope-system-for-2d-fluctuation-measurement-in-the-large-helical-device
#10
Z J Wang, T F Ming, X Gao, X D Du, S Ohdachi
A high-speed tangentially viewing vacuum ultraviolet (VUV) telescope system, using an inverse Schwarzschild-type optic system was developed to study fluctuations in the Large Helical Device (LHD). However, for the original system, the sampling rate was restricted to below 2000 Hz due to the low signal to noise (S/N) ratio in the experiment. In order to improve the S/N ratio, upgrade of the system was made. With this upgraded optical system, the maximum framing rate is improved to 6000 fps with a similar spatial resolution...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910493/plasma-characterization-using-ultraviolet-thomson-scattering-from-ion-acoustic-and-electron-plasma-waves-invited
#11
R K Follett, J A Delettrez, D H Edgell, R J Henchen, J Katz, J F Myatt, D H Froula
Collective Thomson scattering is a technique for measuring the plasma conditions in laser-plasma experiments. Simultaneous measurements of ion-acoustic and electron plasma-wave spectra were obtained using a 263.25-nm Thomson-scattering probe beam. A fully reflective collection system was used to record light scattered from electron plasma waves at electron densities greater than 10(21) cm(-3), which produced scattering peaks near 200 nm. An accurate analysis of the experimental Thomson-scattering spectra required accounting for plasma gradients, instrument sensitivity, optical effects, and background radiation...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910466/first-results-from-solid-state-neutral-particle-analyzer-on-experimental-advanced-superconducting-tokamak
#12
J Z Zhang, Y B Zhu, J L Zhao, B N Wan, J G Li, W W Heidbrink
Full function integrated, compact solid state neutral particle analyzers (ssNPA) based on absolute extreme ultraviolet silicon photodiode have been successfully implemented on the experimental advanced superconducting tokamak to measure energetic particle. The ssNPA system has been operated in advanced current mode with fast temporal and spatial resolution capabilities, with both active and passive charge exchange measurements. It is found that the ssNPA flux signals are increased substantially with neutral beam injection (NBI)...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910435/design-of-an-extreme-ultraviolet-spectrometer-suite-to-characterize-rapidly-heated-solid-matter
#13
S T Ivancic, C R Stillman, D Nelson, I A Begishev, C Mileham, P M Nilson, D H Froula
An ultrafast streaked extreme-ultraviolet (XUV) spectrometer (5-20 nm) was developed to measure the temperature dynamics in rapidly heated samples. Rapid heating makes it possible to create exotic states of matter that can be probed during their inertial confinement time-tens of picoseconds in the case of micron-sized targets. In contrast to other forms of pyrometry, where the temperature is inferred from bulk x-ray emission, XUV emission is restricted to the sample surface, allowing for a temperature measurement at the material-vacuum interface...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910392/real-time-radiative-divertor-feedback-control-development-for-the-nstx-u-tokamak-using-a-vacuum-ultraviolet-spectrometer
#14
V A Soukhanovskii, R Kaita, B Stratton
A radiative divertor technique is planned for the NSTX-U tokamak to prevent excessive erosion and thermal damage of divertor plasma-facing components in H-mode plasma discharges with auxiliary heating up to 12 MW. In the radiative (partially detached) divertor, extrinsically seeded deuterium or impurity gases are used to increase plasma volumetric power and momentum losses. A real-time feedback control of the gas seeding rate is planned for discharges of up to 5 s duration. The outer divertor leg plasma electron temperature Te estimated spectroscopically in real time will be used as a control parameter...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910359/absolute-wavelength-calibration-of-a-doppler-spectrometer-with-a-custom-fabry-perot-optical-system
#15
M M Baltzer, D Craig, D J Den Hartog, T Nishizawa, M D Nornberg
An Ion Doppler Spectrometer (IDS) is used for fast measurements of C VI line emission (343.4 nm) in the Madison Symmetric Torus. Absolutely calibrated flow measurements are difficult because the IDS records data within 0.25 nm of the line. Commercial calibration lamps do not produce lines in this narrow range. A light source using an ultraviolet LED and etalon was designed to provide a fiducial marker 0.08 nm wide. The light is coupled into the IDS at f/4, and a holographic diffuser increases homogeneity of the final image...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910357/diagnostics-for-molybdenum-and-tungsten-erosion-and-transport-in-nstx-u
#16
F Scotti, V A Soukhanovskii, M E Weller
A comprehensive set of spectroscopic diagnostics is planned in the National Spherical Torus Experiment Upgrade to connect measurements of molybdenum and tungsten divertor sources to scrape-off layer (SOL) and core impurity transport, supporting the installation of high-Z plasma facing components which is scheduled to begin with a row of molybdenum tiles. Imaging with narrow-bandpass interference filters and high-resolution spectroscopy will be coupled to estimate divertor impurity influxes. Vacuum ultraviolet and extreme ultraviolet spectrometers will allow connecting high-Z sources to SOL transport and core impurity content...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910323/three-new-extreme-ultraviolet-spectrometers-on-nstx-u-for-impurity-monitoring
#17
M E Weller, P Beiersdorfer, V A Soukhanovskii, E W Magee, F Scotti
Three extreme ultraviolet (EUV) spectrometers have been mounted on the National Spherical Torus Experiment-Upgrade (NSTX-U). All three are flat-field grazing-incidence spectrometers and are dubbed X-ray and Extreme Ultraviolet Spectrometer (XEUS, 8-70 Å), Long-Wavelength Extreme Ultraviolet Spectrometer (LoWEUS, 190-440 Å), and Metal Monitor and Lithium Spectrometer Assembly (MonaLisa, 50-220 Å). XEUS and LoWEUS were previously implemented on NSTX to monitor impurities from low- to high-Z sources and to study impurity transport while MonaLisa is new and provides the system increased spectral coverage...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910216/capillary-electrophoresis-as-tool-for-diastereomeric-separation-in-a-trichilia-catigua-fraction
#18
Ana Luiza Sereia, Renata Longhini, Gisely Cristiny Lopes, João Carlos Palazzo de Mello
INTRODUCTION: The tree Trichilia catigua, popularly known as "catuaba", shows several biological activities and has emerged as a potential source of new drugs. Considering that more than 10 species are known under the same popular name, regulatory agencies require more rigorous quality control of this medicinal plant. OBJECTIVE: To develop and validate a methodology using capillary electrophoresis (CE) with ultraviolet (UV) detection for analysing polyphenols in the ethyl-acetate fraction (EAF) of Trichilia catigua...
December 2, 2016: Phytochemical Analysis: PCA
https://www.readbyqxmd.com/read/27910127/treatment-of-severe-chronic-hand-eczema-results-from-a-uk-wide-survey
#19
I L Smith, S Brown, J Nixon, F C Cowdell, S Ersser, C Fernandez, M Goodfield, C M Green, P Hampton, J T Lear, C H Smith, L Sunderland, S Tubeuf, M Wittmann
Treatment of severe hand eczema (HE) that is resistant to topical potent corticosteroid treatment is challenging. In 2013, we surveyed 194 UK dermatologists to obtain information about their usual treatment pathways to inform the choice of the comparator in a trial of alitretinoin in severe HE (ALPHA trial); the results indicated that the treatment approaches favoured by UK dermatologists differ. Psoralen combined with ultraviolet A (PUVA) and alitretinoin were identified as the most frequent first-line treatment options for hyperkeratotic HE, whereas oral corticosteroids were identified as the most frequent first-line treatment for vesicular HE, followed by PUVA and alitretinoin...
December 2, 2016: Clinical and Experimental Dermatology
https://www.readbyqxmd.com/read/27909733/nitrogen-gas-plasma-treatment-of-bacterial-spores-induces-oxidative-stress-that-damages-the-genomic-dna
#20
Akikazu Sakudo, Yoichi Toyokawa, Tetsuji Nakamura, Yoshihito Yagyu, Yuichiro Imanishi
Gas plasma, produced by a short high‑voltage pulse generated from a static induction thyristor power supply [1.5 kilo pulse/sec (kpps)], was demonstrated to inactivate Geobacillus stearothermophilus spores (decimal reduction time at 15 min, 2.48 min). Quantitative polymerase chain reaction and enzyme‑linked immunosorbent assays further indicated that nitrogen gas plasma treatment for 15 min decreased the level of intact genomic DNA and increased the level of 8-hydroxy-2'-deoxyguanosine, a major product of DNA oxidation...
November 29, 2016: Molecular Medicine Reports
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