20,898 research outputs found
Erratum: Noninvasive Measurements and FEM Analyses for Estimating the Rotor Bar-Lamination Contact Resistance (IEEE Trans. Ind. Appl. (2021) 57: 1 (208-217) DOI: 10.1109/tia.2020.3028347)
No full textIn [1], the correct author affiliations should read: Z. Gmyrek is with the Institute of Mechatronics and Information Systems, Lodz University of Technology, Lodz 90-924, Poland (e-mail: [email protected]). S. Vaschetto, M. Ahmadi Darmani, and A. Cavagnino are with the Politecnico di Torino, Dipartimento Energia, Turin 10129, Italy (e-mail: [email protected]; [email protected]; andrea. [email protected])
Lyman break galaxies and the star formation rate of the Universe at z ~ 6
No full textWe determine the space density of UV-luminous starburst galaxies at z≈ 6 using deep HST ACS SDSS-i′ (F775W) and SDSS-z′ (F850LP) and VLT ISAAC J and Ks band imaging of the Chandra Deep Field South. We find eight galaxies and one star with (i′−z′) > 1.5 to a depth of z′AB= 25.6 (an 8σ detection in each of the 3 available ACS epochs). This corresponds to an unobscured star formation rate of ≈15 h−270 M⊙ yr−1 at z= 5.9, equivalent to L* for the Lyman-break population at z= 3–4 (ΩΛ= 0.7, ΩM= 0.3). We are sensitive to star-forming galaxies at 5.6 ≲z≲ 7.0 with an effective comoving volume of ≈1.8 × 105h−370 Mpc3 after accounting for incompleteness at the higher redshifts due to luminosity bias. This volume should encompass the primeval subgalactic-scale fragments of the progenitors of about a thousand L* galaxies at the current epoch. We determine a volume-averaged global star formation rate of (6.7 ± 2.7) × 10−4h70 M⊙ yr−1 Mpc−3 at z∼ 6 from rest-frame UV selected starbursts at the bright end of the luminosity function: this is a lower limit because of dust obscuration and galaxies below our sensitivity limit. This measurement shows that at z∼ 6 the star formation density at the bright end is a factor of ∼6 times less than that determined by Steidel et al. for a comparable sample of UV-selected galaxies at z= 3–4, and so extends our knowledge of the star formation history of the Universe to earlier times than previous work and into the epoch where reionization may have occurred
Transition to turbulence in a qblique shock-wave/boundary-layer interaction at M=15
No full textDirect numerical simulations are carried out for different forcing techniques to trigger transition during the interaction between an oblique shock-wave and a laminar boundary-layer at M = 1.5. Three forcing methods are used: a) forcing of oblique unstable modes, whose shape and behaviour are determined by the local linear stability theory, b) broadband free-stream acoustic disturbances, and c) a cold plasma flow control device. While the oblique-mode breakdown is dominant for low-amplitude forcing, long streaky structures drive the transition process in a high-amplitude disturbance environment. LES are also performed on the experimental setup by the Institute of Theoretical and Applied Mechanics (ITAM) from Novosibirsk State University with cold plasma actuation. As well as the disturbance type, the effect of Reynolds number and forcing amplitude will be investigated
The mental health of pre-school children and their mothers in a mixed urban/rural population. 1: prevalence and ecological factors
No full textThe prevalence rate of behaviour problems and maternal mental disturbance was estimated using a sample of 1047 families with a 3-year-old child from a mixed urban/rural area. METHOD: Parents completed the Child Behaviour Checklist, EAS Temperament Questionnaire, Weiss-Werry-Peters Activity Scale and the GHQ-30. RESULTS: The rate of behaviour problems (13.2%) was similar to that obtained in studies of urban children. The rate of maternal disturbance (27.6%) was lower than in other population samples. Few differences were found in the prevalence rates in the urban and rural areas. CONCLUSIONS: Preschool children and their parents living in non-urban areas had the same rates of problems as those in conurbations. The service needs of such families are similar regardless of locality
Mobility as first class functionality : ILNPv6 in the Linux kernel
No full textMobility is an increasingly important aspect of communication for the Internet. The usage of handheld computing devices such as tablets and smartphones is increasingly popular among Internet users. However, the current Internet protocol, IP, was not originally designed to support mobility over the Internet. Mobile users currently suffer from connection disruption when they move around. Once a device changes point of attachments between different wireless technology (vertical handoff) e.g. from WiFi to 3G, the IP address changes, and the bound session (e.g. TCP session) breaks. While the IETF Mobile IPv4 (MIPv4) and Mobile IPv6 (MIPv6) solutions have been defined for some time, and implementations are available, they have seen little deployment due to their complexity and performance.
This thesis has examined how IP mobility can be supported as first class functionality, i.e. mobility can be enabled through the end hosts only, without changing the current network infrastructure. Current approaches such as MIPv6 require the use of proxies and tunnels which introduce protocol overhead and impact transport layer performance. The Identifier-Locator Network Protocol (ILNP) is an alternative approach which potentially works end-to-end, but this is yet to be tested. This thesis shows that ILNP provides mobility support as first class functionality, is implemented in an operating system kernel, and is accessible from the standard API without requiring changes to applications. Mobility management is controlled and managed by the end-systems, and does not require additional network-layer entities, only the end hosts need to be upgraded for ILNP to operate. This work demonstrates an instance of ILNP that is a superset of IPv6, called ILNPv6, that is implemented by extending the current IPv6 code in the Linux kernel. A direct performance comparison of ILNPv6 and MIPv6 is presented, showing the improved control and performance of ILNPv6, in terms of flow continuity, packet loss, handoff delay, and signalling overhead
The Benefits of Being Economics Professor A (and not Z)
No full textAlphabetic name ordering on multi-authored academic papers, which is the convention in the economics discipline and various other disciplines, is to the advantage of people whose last name initials are placed early in the alphabet. As it turns out, Professor A, who has been a first author more often than Professor Z, will have published more articles and experienced afaster growth rate over the course of her career as a result of reputation and visibility. Moreover, authors know that name ordering matters and indeed take ordering seriously: Several characteristics of an author group composition determine the decision to deviate from the default alphabetic name order to a significant extent.performance measurement, incentives, economists, name ordering
Monofunctional supramolecular Pt(II) complexes: Synthesis, single crystal structure, anticancer activity, E. coli growth retardation and DNA interaction study
No full textTwo new monofunctional mono-metallic trans-Pt(II)(salicylaldimine)(pyridine)·BF 4 (C1) and supramolecular dimetallic trans-(Pt(II)(salicylaldimine)) 2 (4,4-bipyridine)·2BF 4 (C2) complexes were designed and synthesized through ancillary chloride ligand exchange strategy and structurally characterized by spectroscopic, spectrophotometric and single crystal X-ray analyses. The solid-state structure analyses revealed interactions between the coordination planes, inter-molecular H-bonding, bonding in the ligand hydrogen and BF 4 anions and supramolecular interactions with solvent molecules in crystal packing. The in vitro anticancer effect of these complexes was investigated in breast (MCF-7) and liver (HepG2) cancer cells. Both these complexes showed significant anticancer effect comparable to cisplatin. Similarly, the effect of these complexes on Escherichia coli (E. coli) growth retardation was also analyzed and the results revealed stronger growth retardation effect and elongated morphology of bacterial cells in similar fashion as observed for cisplatin. The DNA interaction of C1 and C2 was investigated by gel electrophoresis using pET28 as target DNA. These complexes retarded migration of DNA across the gel showing their interaction with DNA
Logarithmic variance profiles and the corresponding f-1 spectra of temperature fluctuations in turbulent Rayleigh-Bénard convection
No full textWe report experimental results for the temperature variance 2(z) and the corresponding frequency spectra P(f) in turbulent Rayleigh-Bénard convection (RBC) in a cylindrical sample of aspect ratioT= D/L = 1:00 (D = 1:12 m is the diameter and L = 1:12 m the height). The measurements were conducted in the Rayleigh-number range 1011 < Ra < 1:35 1014 and Pr ' 0:8. For Ra = 1:35x1014, 2(z) could be described well by a logarithmic dependence on the vertical position z in a range of z 1 < z < z 2 with z 1 ' 70 and z 2 = 0:1L. Here L=(2Nu) is the thickness of a thin thermal sublayer adjacent to the horizontal plate where the heat flux (denoted by the Nusselt number Nu) is carried mostly by thermal diffusion. In the log layer, we found that the temperature spectra had a significant frequency range over which P(f) f with close to 1. As Ra decreased, increased so that the log layer became thinner. At Ra = 2:05 1011, z 2 < z 1 and therefore there was no range for a log layer. Correspondingly, the temperature spectrum near the horizontal plate did not have the f1 scaling form either
Triangular Constellations in Flows
No full textParticles advected on the surface of a fluid can exhibit fractal clustering. The local structure of a fractal set is described by its dimension , which is the exponent of a power-law relating the mass in a ball to its radius : . It is desirable to characterise the {\em shapes} of constellations of points sampling a fractal measure, as well as their masses. The simplest example is the distribution of shapes of triangles formed by triplets of points, which we investigate for fractals generated by chaotic dynamical systems. The most significant parameter describing the triangle shape is the ratio of its area to the radius of gyration squared. We show that the probability density of has a phase transition: is independent of and approximately uniform below a critical flow compressibility , which we estimate. For the distribution appears to be described by two power laws: when , and when
Self-archiving practice and the influence of publisher policies in the social sciences
No full textAuthors in different disciplines exhibit very different behaviours on the so-called ‘green’ road to open access, i.e. self-archiving. This study looks at the self-archiving behaviour of authors publishing in leading journals in six social science disciplines. It tests the hypothesis that authors are self-archiving according to the norms of their respective disciplines rather than following self-archiving policies of publishers, and that, as a result, they are self-archiving significant numbers of publisher PDF versions. It finds significant levels of
self-archiving, as well as significant self-archiving of
the publisher PDF version, in all the disciplines
investigated. Publishers’ self-archiving policies have
no influence on author self-archiving practice
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