197,757 research outputs found
The IEEE symposium on Computers and Communications
No full textISCC 2010 General Chairs: A. Corradi; M. Daneshmad - Technical Program Co-Chairs: P. Bellavista; Chi-Ming Chen; H. Hossanein. Proceedings of the 15th IEEE Symposium on Computers and Communications 2010, Riccione, Italy, June 22-25, 2010
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
Search for new hadronic decays of h c and observation of h c → p p ¯ η
No full textAbstract A search for the hadronic decays of the h c meson to the final states p p ¯ π + π − π 0, p p ¯ η , and p p ¯ π 0 via the process ψ(3686) → π 0 h c is performed using (4.48 ± 0.03) × 108 ψ(3686) events collected with the BESIII detector. The decay channel h c → p p ¯ η is observed for the first time with a significance greater than 5σ and a branching fraction of (6.41 ± 1.74 ± 0.53 ± 1.00) × 10 −4, where the uncertainties are statistical, systematic, and that from the branching fraction of ψ(3686) → π 0 h c . Strong evidence for the decay h c → p p ¯ π + π − π 0 is found with a significance of 4.9σ and a branching fraction of (3.84 ± 0.83 ± 0.69 ± 0.58) × 10 −3. The significances include systematic uncertainties. No clear signal of the decay h c → p p ¯ π 0 is found, and an upper limit of 6.59 × 10 −4 on its branching fraction is set at the 90% confidence level
Ethusina dilobotus Chen 1993
No full text<i>Ethusina dilobotus</i> Chen, 1993 <p>(Fig. 1)</p> <p> <i>Material examined. –</i> 1 male, 8.0 by 8.2 mm (NTOU), Station CD 129, 22 5.89’N, 121 5.21’E, 1271-1275 m, coll. TAIWAN 2001, R. V. “Ocean Researcher 1”, 21 Aug.2001.</p> <p> <i>Remarks. –</i> The present male specimen (especially the pereoipod proportions and form of the G1) agree best with the description and figures of <i>E. dilobotus</i> by Chen (1993: 338, Fig. 17), although it was described (and only known) on the basis of one specimen from New Caledonia. The carapace of the present specimen, however, seems to have the lateral carapace margin less distinctly convex compared to that figured by Chen (1993: Fig. 17a) and the median frontal tooth also appears to be relatively stronger. The significance of these differences is difficult to assess; and will require more material.</p>Published as part of <i>Ng, Peter K. L. & Ho, P. - H., 2003, On The Deep-Water Dorippid Crabs Of The Genus Ethusina Smith, 1884 (Crustacea: Decapoda: Brachyura) From Taiwan, pp. 71-85 in Raffles Bulletin of Zoology 51 (1)</i> on page 72, DOI: <a href="http://zenodo.org/record/4619337">10.5281/zenodo.4619337</a>
Modelling of Partial Discharge Behaviour in a Spherical Cavity within a Solid Dielectric Material as a Function of Temperature
No full textPartial discharge (PD) is an electrical discharge within a dielectric which does not bridge the electrodes. PD measurement has been widely used for assessing performance of insulation systems. Modelling of PD activity gives an insight of this activity and can provide important information for insulation diagnosis. In this paper, a finite element analysis (FEA) method has been used to build a model of PD activity within a spherical cavity in a dielectric material. The model has been used to study critical parameters and physical mechanisms affecting PD activity as a function of temperature. Critical parameters from the model have been identified through comparison between simulation and measurement results
Measurement of Partial Discharge Activities within Two Artificial Spherical Voids in an Epoxy Resin
Full text linkMeasurement of partial discharge activities within insulation systems has been extensively performed. It has been widely used in the performance assessment of an insulation system and for insulation diagnostics. Since a void cavity is one of the potential sources of PD activity in insulation which may cause degradation and breakdown, it is very important to study PD events associated with void cavities solid dielectric insulation. In this work, the measurement of PD activity has been performed on test samples consisting of two spherical voids within an epoxy resin. Two voids of same and different sizes are positioned close to each other and in parallel with the direction of the applied field within the epoxy. Through comparison of the experiment data for PD events within a single void in the epoxy, single and multiple discharge sources from different voids can be clearly distinguished
Partial Discharge Behaviour within Two Spherical Cavities in a Dielectric Material
Full text linkIn high voltage insulation systems, a typical defect that exists is a void cavity. It is known that voids are a common source of partial discharge (PD) activity within an insulation system. Research on PD activities within a single void in an insulation material has been widely published. However, studies of PDs within insulation containing multiple voids have not been widely reported. Thus, a simulation model has been developed in this work to attain a better insight of PD events due to multiple voids. Two- and three-dimensional model geometries, which consist of two spherical voids, arranged in different positions with respect to the applied field direction in a dielectric material have been developed using finite element analysis (FEA) software. The models have been used to study the electric field distribution in the voids and PD inception voltage for different distances between the two voids, locations in the material and their respective sizes
Modeling of Surface Charge Decay in a Spherical Cavity within a Solid Dielectric Material using Finite Element Analysis
No full textThe modelling of cavity surface charge decay through conduction along the cavity wall using the Finite Element Analysis (FEA) method is presented in this paper. A field-dependent cavity surface conductivity is proposed and the Phase-Resolved Partial Discharge (PRPD) patterns obtained from experimental measurements used to validate the simulation results generated using the model. A comparison between the simulation and measurement results has also been undertaken to verify the surface charge decay effect
From Financial Depression to Financial Deregulation? The Construction of Futures Trading Industry in Taiwan
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