1,721,012 research outputs found
Discussion of ' Numerical and Experimental Study on Two-Dimensional Flood Flows with and Without Structures' by Shige-eda/Akiyama
No full textThe impact of a two dimensional flood current against single or bunched obstacles has been widely investigated experimentally as well as numerically in the last years, also in the framework of EU project ( IMPACT -Investigation of Flood Processes and Uncertainties).
The authors applied a first order upwind numerical solver (Roe scheme) to investigate if a lower order of accuracy solver could give comparable results to the one published by Mirei Shige and Juichiro Akiyama. The simulations show that the first order solver succeeds in reproducing the wave front steepness. This can be emphasised by refining the computational grid
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
A Scalable System Architecture for High-Performance Fault Tolerant Machine Drives
Full text linkWhen targeting mission critical applications, the design of the electronic actuation systems needs to consider many requirements and constraints not typical in standard industrial applications. One of these is tolerance to faults, as the unplanned shutdown of a critical subsystem, if not handled correctly, could lead to financial harm, environmental disaster, or even loss of life. One way this can be avoided is through the design of an electric drive systems based on multi-phase machines that can keep operating, albeit with degraded performance, in a partial configuration under fault conditions. Distributed architectures are uniquely suited to meet these challenges, by providing a large degree of isolation between the various components. This paper presents a system architecture suitable for scalable and high-performance fault tolerant machine drive systems. the effectiveness of this system is demonstrated through theoretical analysis and experimental verification on a six-phase machine
Ex Dalmatia Romam: La stele del marinaio della flotta Ravennate C. Licinius Romulus
No full textRecent excavations carried out at the necropolis of Villa Doria Pamphili, Rome, brought to light a large stele, which belonged to C. Licinius Romulus. He was a sailor of the of the fleet of Ravenna. He was part of the crew of the trireme Hercule and died at the age of 40 after 21 years of service. He was buried in this necropolis by his heir. This stele differs from other similar 2 cent. AD. artifacts, found in the same necropolis and which also belonged to sailors from Ravenna. The main peculiarity of this stele lies in the detailed representation of the classiarius, with hasta navalis on the right and codex ansatus on the left
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