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J-PLUS: Identification of low-metallicity stars with artificial neural networks using SPHINX
Whitten, D. D.,Placco, V. M.,Beers, T. C.,Chies-Santos, A. L.,Bonatto, C.,Varela, J.,Cristó,bal-Hornillos, D.,Ederoclite, A.,Masseron, T.,Lee, Y. S.,Akras, S.,Borges Fernandes, M.,Caballero, J. Springer-Verlag 2019 Astronomy and astrophysics Vol.622 No.-
<P><I>Context.</I> We present a new methodology for the estimation of stellar atmospheric parameters from narrow- and intermediate-band photometry of the Javalambre Photometric Local Universe Survey (J-PLUS), and propose a method for target pre-selection of low-metallicity stars for follow-up spectroscopic studies. Photometric metallicity estimates for stars in the globular cluster M15 are determined using this method.</P><P><I>Aims.</I> By development of a neural-network-based photometry pipeline, we aim to produce estimates of effective temperature, <I>T</I>eff, and metallicity, [Fe/H], for a large subset of stars in the J-PLUS footprint.</P><P><I>Methods.</I> The Stellar Photometric Index Network Explorer, SPHINX, was developed to produce estimates of <I>T</I>eff and [Fe/H], after training on a combination of J-PLUS photometric inputs and synthetic magnitudes computed for medium-resolution (<I>R</I> ~ 2000) spectra of the Sloan Digital Sky Survey. This methodology was applied to J-PLUS photometry of the globular cluster M15.</P><P><I>Results.</I> Effective temperature estimates made with J-PLUS Early Data Release photometry exhibit low scatter, σ(<I>T</I>eff) = 91 K, over the temperature range 4500 < <I>T</I>eff (K) < 8500. For stars from the J-PLUS First Data Release with 4500 < <I>T</I>eff (K) < 6200, 85 ± 3% of stars known to have [Fe/H] < −2.0 are recovered by SPHINX. A mean metallicity of [Fe/H] = − 2.32 ± 0.01, with a residual spread of 0.3 dex, is determined for M15 using J-PLUS photometry of 664 likely cluster members.</P><P><I>Conclusions.</I> We confirm the performance of SPHINX within the ranges specified, and verify its utility as a stand-alone tool for photometric estimation of effective temperature and metallicity, and for pre-selection of metal-poor spectroscopic targets.</P>
試驗製作한 凍結乾燥裝置의 特性과 人蔘抽出液의 乾燥에 對하여
崔鍾旭,細川明,相良泰行 慶北大學校 1984 論文集 Vol.37 No.-
To study the controlling factors which affect the drying rate during freeze-drying process, the authors have contructed an experimental freeze-drying apparatus as shown in Fig. 1. The characteristics of apratus as well as the exerimental results obtained from Korean ginseng extracts are summerized as follows; 1. The changes in sample weight, drying rate, temperature distribution in a sample, heater temperature and total pressure during the freeze-drying process of ginseng textracts was measured. 2. The weight measuring device had the sensitivity of 0.2g and an accuracy of 1/500 when the sample weight was 100g. 3. The required time for the freezing of ginseng extracts was about 40 minutes. 4. In the drying process of ginseng extracts (it’s concentration, 20%), the arrival time to established temperature was required about 7 hours, and the total time of the whole freeze-drying process of ginseng extracts was required about 45 hours.
Knop, Katrin,Mingotaud, Anne-Francoise,El-Akra, Naram,Violleau, Frederic,Souchard, Jean-Pierre Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.3
Incorporation of unaggregated monomeric molecules of pheophorbide(a) into micelles of poly(ethyleneoxide-b-e-caprolactone) has been characterized by fluorescence spectroscopy, dynamic light scattering, transmission electron microscopy and asymmetric flow field flow fractionation. It was shown that the method used leads to 20 nm micelles, corresponding to approximately 200 molecules of polymer and 4 molecules of monomeric pheophorbide(a) per nano-object which was able to generate $^1O_2$ in the medium. They have been used thereafter as nanocarriers for photosensitizers in photodynamic therapy against cancer cells. The encapsulation of photosensitizer has been verified and in vitro tests on human cancerous cells have revealed a ca. 2-fold enhanced photocytotoxicity and cellular uptake compared to free pheophorbide(a).