1,118,377 research outputs found
A 2 h periodic variation in the low-mass X-ray binary Ser X-1
No full textSpectroscopy of the low-mass X-ray binary Ser X-1 using the Gran Telescopio Canarias have revealed a ?2 h periodic variability that is present in the three strongest emission lines. We tentatively interpret this variability as due to orbital motion, making it the first indication of the orbital period of Ser X-1. Together with the fact that the emission lines are remarkably narrow, but still resolved, we show that a main-sequence K dwarf together with a canonical 1.4 M? neutron star gives a good description of the system. In this scenario, the most likely place for the emission lines to arise is the accretion disc, instead of a localized region in the binary (such as the irradiated surface or the stream-impact point), and their narrowness is due instead to the low inclination (?10°) of Ser X-1
Productivity measurement at the micro level
No full textBibliography: p. 45.Gabriel R. Bitran and Li Chang
An optimization approach to the Kanban system
No full textBibliography: p.31.by Gabriel R. Bitran and Li Chang
Pleurospermum tripartitum sp nov (Umbelliferae) from western Yunnan, China
No full textPleurospermum tripartitum Pu, R. Li & H. Li, a new species of Umbelliferae from western Yunnan, China, is described and illustrated. It is closely similar to P. macrochlaenum K. T. Fu & Y. C. Ho, but differs by having unbranched stem, conspicuous calyx teeth, and white petals
Spectroscopy of high-lying resonances in 9 Be by the measurement of ( p , p ), ( p , d ), and ( p , α ) reactions with a radioactive 8 Li beam
No full textWe measured the
8
Li
(
p
,
p
)
8
Li
,
8
Li
(
p
,
d
)
7
Li
, and
8
Li
(
p
,
α
)
5
He
reactions at low energies using the thick target inverse kinematics method, with a polyethylene
[
CH
2
]
n
target and a radioactive
8
Li
beam available at the Radioactive Ion Beams in Brazil facility of São Paulo. By measuring simultaneously several reaction channels
(
p
,
p
)
,
(
p
,
d
)
, and
(
p
,
α
)
, the still uncertain high-lying resonances of
9
Be
, close to the proton threshold, can be studied and their parameters, such as energy, width, and spin parity can be more reliably determined. The experimental excitation functions of the reactions
8
Li
(
p
,
p
)
8
Li
,
8
Li
(
p
,
d
)
7
Li
, and
8
Li
(
p
,
α
)
5
He
were analyzed using the
R
-matrix theory, which allows us to infer the properties of the resonances. Multichannel
R
-matrix analysis provides evidence for a significant clustering in the
(
p
,
d
)
channel. The experimental data and the multichannel
R
-matrix analysis will be presented.Fundação de Amparo à Pesquisa do Estado de São Paulo. Brasil. (FAPESP) 2011/15904-7, 2013/22100-7 y 2016/21434-7VI Plan Propio de Investigación de la Universidad de Sevilla. España. (2017–2018
Li, C.P. -- 1976-82 -- Correspondence, Individual -- letter, 1976-09-07
No full textLetter from Li, C. P. to Sabin, Albert B. dated 1976-09-07.Sabin Collection Fair Use Policy</a
Study on the Mg-Li-Zn ternary alloy system with improved mechanical properties, good degradation performance and different responses to cells
No full textNovel Mg-(3.5, 6.5wt%)Li-(0.5, 2, 4wt%)Zn ternary alloys were developed as new kinds of biodegradable metallic materials with potential for stent application. Their mechanical properties, degradation behavior, cytocompatibility and hemocompatibility were studied. These potential biomaterials showed higher ultimate tensile strength than previously reported binary Mg-Li alloys and ternary Mg-Li-X (X=Al, Y, Ce, Sc, Mn and Ag) alloys. Among the alloys studied, the Mg-3.5Li-2Zn and Mg-6.5Li-2Zn alloys exhibited comparable corrosion resistance in Hank's solution to pure magnesium and better corrosion resistance in a cell culture medium than pure magnesium. Corrosion products observed on the corroded surface were composed of Mg(OH)2, MgCO3 and Ca-free Mg/P inorganics and Ca/P inorganics. In vitro cytotoxicity assay revealed different behaviors of Human Umbilical Vein Endothelial Cells (HUVECs) and Human Aorta Vascular Smooth Muscle Cells (VSMCs) to material extracts. HUVECs showed increasing nitric oxide (NO) release and tolerable toxicity, whereas VSMCs exhibited limited decreasing viability with time. Platelet adhesion, hemolysis and coagulation tests of these Mg-Li-Zn alloys showed different degrees of activation behavior, in which the hemolysis of the Mg-3.5Li-2Zn alloy was lower than 5%. These results indicated the potential of the Mg-Li-Zn alloys as good candidate materials for cardiovascular stent applications. Statement of significance: Mg-Li alloys are promising as absorbable metallic biomaterials, which however have not received significant attention since the low strength, controversial corrosion performance and the doubts in Li toxicity. The Mg-Li-Zn alloy in the present study revealed much improved mechanical properties higher than most reported binary Mg-Li and ternary Mg-Li-X alloys, with superior corrosion resistance in cell culture media. Surprisingly, the addition of Li and Zn showed increased nitric oxide release. The present study indicates good potential of Mg-Li-Zn alloy as absorbable cardiovascular stent material.Accepted Author ManuscriptBiomaterials & Tissue Biomechanic
david-bogdan-r/ARTEM: ARTEM version 2.0
No full text<p>The release contains significant additions to ARTEM's functionality making it suitable for RNA tertiary motif search:</p>
<ul>
<li>r/q arguments support specifying a folder or a mask to define a list of PDB/mmCIF files, or an identifier to load a structure from the RCSB PDB;</li>
<li>added rnosub/qnosub arguments to filter sub-matches;</li>
<li>added rrst/qrst arguments to apply additional restraints on the matches.</li>
</ul>
<p>See README.md for more details.</p>
P-R curve contrast.
No full text(a) P-R curve of Faster R-CNN (b) P-R curve of ROMS R-CNN. It represents the AP comparison curve using two algorithms Faster R-CNN and ROMS R-CNN to detect the three categories of liquid level gauge, valve and insulator.</p
P e r an E li t L ok al D alam P e n ge n d ali an P r osti tusi Di De sa G e n d oh K e c a m at an S e m p u K ab u p at e n B an yu w an gi
No full textP
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