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Confined discharge plasma sources for Z-pinch experiments

IEEE 1989 International Conference on Plasma Science, 1989

Summary Form only given, as follows. The authors have investigated Z-pinch implosion on the NRL Gamble II generator using metallic sources of sodium and aluminum and nonmetallic sources of sodium (NaF), magnesium (MgF/sub 2/), and aluminum (Al/sub 2/O/sub 3/). For 1-MA driving currents, peak K-shell radiated power of about 100 GW and energies of about 1.5 kJ have been obtained ...


Laser Architectures for Space-Based Sodium Resonance Fluorescence Lidar

2018 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR), 2018

NASA GSFC is developing a space-based sodium resonance fluorescence lidar for the International Space Station (ISS). We discuss the technology, prototypes, risks and trades for two laser architectures - Raman laser and sum frequency generation.


Stimulated emission on sodium D-lines using broadband optical pumping

2017 18th International Conference of Young Specialists on Micro/Nanotechnologies and Electron Devices (EDM), 2017

This paper considers the issue how to obtain the amplification of stimulated emission in the cell with sodium vapor using a longitudinally pumped dye laser arrangement at a line shorter than the transitions from the ground state to the levels D1 and D2. The broadening of the emission wavelength is calculated.


Stem Cell Proliferation and Differentiation through Capped Clay Nanotubes

2016 32nd Southern Biomedical Engineering Conference (SBEC), 2016

Stem cells can be coaxed to grow into new bone or new cartilage better and faster when given the right molecular cues [1, 2]. Depending on the target tissue, control over the physical, chemical and mechanical influences is key to directing cell behavior in three-dimensions, and, ultimately, as a method to grow tissues for regenerative medicine applications. We designed a ...


Diode-laser pumped erbium-doped fluorozirconate fibre amplifier for the 1530 nm communications window

Electronics Letters, 1990

An erbium-doped fluorozirconate fibre amplifier has been pumped at 1480 nm using a semiconductor diode laser. The small signal gain was 15 dB for 25 mW launched pump power. The ASE bandwidth was 45 nm and the predicted noise figure was 5 dB.<>


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  • Confined discharge plasma sources for Z-pinch experiments

    Summary Form only given, as follows. The authors have investigated Z-pinch implosion on the NRL Gamble II generator using metallic sources of sodium and aluminum and nonmetallic sources of sodium (NaF), magnesium (MgF/sub 2/), and aluminum (Al/sub 2/O/sub 3/). For 1-MA driving currents, peak K-shell radiated power of about 100 GW and energies of about 1.5 kJ have been obtained with both pure aluminum and NaF implosions. The aluminum results are comparable to those in previous Gamble II experiments with aluminum wire arrays. The work has been motivated by the need for a sodium source for Na/Ne X-ray laser experiments. Confined discharge sources have been used to generate tens of gigawatts in the Na and He- alpha pump line, and fluorescence of the neon has been observed. The effects of nozzle shape and size, chamber diameter, amount of fuse material, and confined discharge current have been investigated in Gamble II implosion experiments. The studies indicate that confined discharge sources are capable of supplying significantly more material than required for implosions at the 1-MA level, so that this technique could be extended to higher current generators.<>

  • Laser Architectures for Space-Based Sodium Resonance Fluorescence Lidar

    NASA GSFC is developing a space-based sodium resonance fluorescence lidar for the International Space Station (ISS). We discuss the technology, prototypes, risks and trades for two laser architectures - Raman laser and sum frequency generation.

  • Stimulated emission on sodium D-lines using broadband optical pumping

    This paper considers the issue how to obtain the amplification of stimulated emission in the cell with sodium vapor using a longitudinally pumped dye laser arrangement at a line shorter than the transitions from the ground state to the levels D1 and D2. The broadening of the emission wavelength is calculated.

  • Stem Cell Proliferation and Differentiation through Capped Clay Nanotubes

    Stem cells can be coaxed to grow into new bone or new cartilage better and faster when given the right molecular cues [1, 2]. Depending on the target tissue, control over the physical, chemical and mechanical influences is key to directing cell behavior in three-dimensions, and, ultimately, as a method to grow tissues for regenerative medicine applications. We designed a hydrogel that provides control over local biomaterial properties and that permits guidance over the process of development leading to extracellular matrix and tissue development. Our hydrogel nanocomposite consisting of alginate or chitosan, and growth factors doped Halloysite Nanotubes (HNTs). Results demonstrate that HNT addition improved nanocomposite material properties and created a cell supportive environment. While the focus in this study was on osteoblast differentiation this approach may permit local control over the behavior of varied cell types and allow the engineering of complex tissues using a single stem cell source.

  • Diode-laser pumped erbium-doped fluorozirconate fibre amplifier for the 1530 nm communications window

    An erbium-doped fluorozirconate fibre amplifier has been pumped at 1480 nm using a semiconductor diode laser. The small signal gain was 15 dB for 25 mW launched pump power. The ASE bandwidth was 45 nm and the predicted noise figure was 5 dB.<>

  • Influence of physical characteristics and mechanical properties on polyvinylchloride flexible sheet with calcium carbonate from shells

    Cockles are one of phylum mollusca, when consuming cockles, the shells have to be removed before consuming, causing lots of wastes. This study aims to produce high purity of calcium carbonate (CaCO3)from cockle shells and investigate the effect of CaCO3 from the cockle shell in polyvinylchloride (PVC) flexible sheet focusing on its physical properties. The experiment was performed by bringing barks of shells; cleaning them in boiling water, then going through the desiccation process at 900°C in order to remove all organic substances and crushing them thoroughly. The resultants became a calcium oxide powder. Calcium oxide was dissolved with distilled water then reacted with sodium carbonate, which resulted in CaCO3powder. After that, filler in PVC flexible sheet at 5, 10, 15 and 20 part per hundred resin (phr) was compared with commercial CaCO3. The results showed that cockle shells were successfully in producing CaCO3which can be used as calcium source with elemental analysis X-Ray fluorescence spectrometer (XRF) and the result showed CaCO3content 97.68% and median particle size (D50) 10.3 μm. That CaCO3from the cockle shell indicated mechanical properties as tensile strength and elongation thermal heating shrinkage after aging and slightly increased hardness similar to commercial grade.

  • Remediation of polycyclic aromatic hydrocarbons (PAH)-contaminated marine sediment with surfactants

    This study was focused on removal efficiency of PAHs from contaminated sediment using anionic surfactant: Triton X-100 (TX-100), Simple Green (SG)) and nonionic (Sodium dodecyl sulfate (SDS), Sodium dodecylbenzene sulfonate (SDBS)) surfactants. In this study various operating parameters were investigated such as surfactant concentration, liquid/solid ratio, washing time, and washing frequency. The maximum removal efficiency evaluated was 68% obtained by using TX-100 (100 CMC: 19 mM). The optimized factors for the evaluation were liquid/solid ratio of 20 with 1 h each washing time and 20 times washing frequency. The result were significantly influenced due to frequency of soil washing, surfactant concentration; liquid/solid ratio; and washing frequency while excessive operating parameter caused decreased in removal efficiency.

  • Ranolazine attenuates stretch-induced modifications of electrophysiological characteristics in HL-1 cells

    Mechanical stretch induces an increase in Na+influx into myocytes, related to mechanisms including stretch-activated channels or activation of Na+/H+ exchanger, involving changes in electrophysiological properties favouring arrhythmia induction. The aim of this study is to investigate the effects of mechanical stretch in cultured atrial murine cells (HL-1 myocytes) and its pharmacological response to ranolazine. Confluent HL-1 myocytes with spontaneous fibrillatory activity was cultured in silicone membrane plates, and were stretched to 110% of resting length. The response to stretch under control conditions and under ranolazine effects was analyzed using a high- resolution optical mapping system. HL-1 cells stretching increased atrial fibrillation dominant frequency in control conditions. The administration of ranolazine reduced this stretch-induced effect, and slowed the arrhythmia in baseline conditions. Ranolazine attenuates the modifications of electrophysiological effects induced by myocardial stretch in HL-1 cells model of AF.

  • Reliability and maintainability data for liquid metal cooling systems

    This paper presents component failure rate data for use in assessment of liquid metal cooling systems. Best estimate data applicable to fusion liquid metal coolants is presented. Repair times for similar components are also referenced in this work. These data support probabilistic safety assessment and reliability, availability, maintainability and inspectability analyses.

  • Study on influence of physicochemical property of an active pharmaceutical ingredient against THz spectrum: Example of CNS stimulant

    Caffeine and sodium benzoate (CSB), the central nervous system (CNS) stimulant, which is sometimes illegally used with amphetamines to obtain sexual arousal was used in this study. According to comparison of terahertz spectra obtained from three CSB distributed as Japanese Pharmacopoeia (JP) active pharmaceutical ingredients (APIs), difference of one terahertz spectrum of three manufacturers was observed. This observation seems to be due to slightly different crystal structure of CSBs. The characteristic terahertz spectrum based on the manufacturing process can be utilized as fingerprint information to detect fake or substandard API, or mixing of counterfeit drugs.



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