6,585 research outputs found
Serial order in short-term memory
No full textHow do we maintain a novel sequence of items in the correct order? For example, how do we remember the car number plate at the scene of a crime? Or how do we remember an unfamiliar telephone number during the few seconds between putting down the telephone directory and picking up the telephone? This immediate serial recall or ‘memory-span’ task has fascinated psychologists for decades; it has remained the dominant empirical tool behind contemporary theories of short-term memory, such as Alan Baddeley’s working-memory theory (Baddeley, 1986). However, like many questions in cognitive psychology, the apparent ease with which we perform such a simple task (providing the telephone number is not too long!) masks a rich and complex host of issues
Simultaneous Optimisation of Dynamic Power, Area and Delay in Behavioural Synthesis
No full textConcern over power dissipation coupled with the continuing rise in system size and complexity means that there is a growing need for high-level design tools capable of automatically optimising systems to take into account power dissipation, in addition to the more conventional metrics of area, delay and testability. Current methods for reducing power consumption tend to be ad-hoc: for example, slowing down, or turning off idle parts of the system, or a controlled reduction in power supply. The behavioural synthesis system described in this paper features an integrated incremental power estimation capability, which makes use of activity profiles, generated automatically through simulation of a design on any standard VHDL simulator; accurate circuit-level cell models (generated, again automatically, via Spice simulation); and a comprehensive system power model. This data, along with similar estimators for area and delay, guides the optimisation of a design towards independent, user-specified objectives for final area, delay, clock speed, and energy consumption. In addition, a range of power reducing features are included encompassing: supply voltage scaling, clock gating, input latching, input gating, low-power cells, and pipelined and multicycle units. These are automatically exploited during optimisation as part of the area/delay/power dissipation trade-off process. The resulting system is capable of reducing the estimated energy consumption of several benchmark designs by factors of between 3.5 and 7.0 times. Furthermore, the design exploration capability enables a range of alternative structural implementations to be generated from a single behavioural description, with differing area/delay/power trade-offs
DelftCluster Railway transition zones: Factual report short term measurement 2008
No full textThis report gives an overview of the extensive short term measurements undertaken for the Delft Cluster project Railway transition zones. The objective of the project was to measure the response of the railway track and ground, at a transition zone' during the passage of regular service trains. Both Deltares and the University of Southampton performed measurements at the Gouda Goverwelle (GoGo) site. Both institutes have large amounts of measured data available for the project. Secondly, additional data is provided by Dutch railway operators. In order to make sure that data can be shared without problems it is essential that all data is properly documented. To ensure a problem free exchange of measurements and data, they are not only summarized in this report but they are given proper names as well. This way there will be less chance of misunderstandings between the two institutes when discussing measurement data
Annales rerum gestarum lfredi Magni, [electronic resource] : auctore Asserio Menevensi, recensuit Franciscus Wise, A.M. Coll. Trin. Soc.
No full textTitlepage in red and black; a variant has the titlepage printed in black only.With an additional titlepage: 'Annales rerum gestarum lfredi magni, quibus accedunt I. Archiepiscopi Parkeri prfatio ad Asserium. .. X. Index locurum qui in hoc libro memorantur.', Oxonii, A.D. MDCCXXII.With a list of subscribers.Electronic reproduction.English Short Title Catalog,Reproduction of original from British Library
Delft Cluster Railway transition zones & Switches: Factual report short-term measurement 2009
No full textFor the Delft Cluster 'Railway transition zones and switches' project, extensive measurements are made. The measurements are divided into three types. The short-term measurement of may 2009 is the subject of this report. The long-term and soil investigation measurements are described in other reports. The goal of this report is to make sure that all measurements are available to everyone involved and to properly name all the measurements. This will prevents problems with wrong or old data, additionally it will facilitate the communication between all involved in the project. This report describes the results of the short-term measurements at Gouda Goverwelle May 2009
Beach morphodynamic systems of the central Netherlands coast, Den Helder to Hoek van Holland
No full textThe 120 km long central Netherlands coast consists of an essentially continuous sandy Holocene regressive/transgressive barrier system facing the southern North Sea. The beach and surf zone is composed of predominantly quartz sands which are coarsest at the shoreline (D50 = 286 Um) and fine seaward. Overall shoreface gradients vary between a low of 0.01 in the central region steepening to 0.015 towards dan Helder in the north and Hoek van Holland in the south. Tides are micro-tidal ranging from 1.4 to 1.7 m. The wave climate is a fetch limited strom wave environment generated by onshore winds in the North Sea together with occasional swell. Waves average 1.4 m in height with a period of 5.4 sec. They peak during the wmter storms with a January mean Ho = 1.86 m and storm waves to 3 - 4 m. During summer they decrease to a mean of - 1.0m. The interaction of the wave climate with the sandy shoreface has produced a 2 to 3 bar surf zone. Based on aerial photographs, the inner (bar 1) is modally a ridge and runnel/low tide terrace, bar 2 varies between transverse bar and rip and rhythmic bar and beach, while the outer bar 3 where present is rhythmic bar and beach to longshore bar and trough. All bars are characterised by rhythmic topography and rips which increase in spring from a mean of 500 m (bar 1) to 600 m (bar 2) and 900 m (bar 3). Groyne fields occupy 43 km of the coast and with a mean spring of 200 m induce an increase in rip occurrence and decrease in rip spacing. The morphodynamics of the beach-bar system can be explained in temporal and spatial terms by examining the impact of the wave climate on the shoreface. Temporal variation is controlled both by seasonal variation in wave height and storm frequency and by inter-storm beach recovery. It is proposed that the spatial variation in bar number (2 or 3), bar spacing and rip spacing is related to infragravity standing and edge waves generated by wave groupiness, acting across the two slope regimes (0.01 and 0.015) which produce standing wave lengths which correlate with actual bar spacing and edge wave lengths which correlate reasonably with rip spacings. Both require however field verification. The hierarchy of bar types is empirically explained by decreasing breaker wave heights across the 300-600 m wide surf zone. Finally a beach model is proposed for the coast consisting of six stages, a fully dissipative end member expected to occur during severe storm surges, two intermediate modal states consisting of the bar types mentioned above, and lower energy intermediate and a reflective member which are unlikely to occur in this wave climate
The Middle Platonists: 80 B.C. to A.D. 220
No full textThe Middle Platonists: 80 B.C. to A.D. 220 John M. Dillon (Author), 1977 Table of Contents Preface Abbreviations 1 The Old Academy and the Themes of Middle Platonism 2 Antiochus of Ascalon: The Turn to Dogmatism 3 Platonism at Alexandria: Eudorus and Philo 4 Plutarch of Chaeroneia and the Origins of Second-Century Platonism 5 The Athenian School in the Second Century A.D. 6 The 'School of Gaius': Shadow and Substance 7 The Neopythagoreans 8 Some Loose Ends Bibliography Afterword General ..
Charles Berlitz, Author of "Doomsday," Takes Predictions
No full textCharles Berlitz, author of "Doomsday," makes predictions that life will cease after 2000 A.D
OSCURAUIT SOL: Stone Engravings and Other Contemporary Spanish Records for the A.D. 1239 and A.D. 1354 Eclipses and Their Astronomical Implications
No full textThe eclipse of a.d. 1239 June 3 was observed at no less than 10 sites in Europe, but the one from a.d. 1354 September 17 was observed only from two European sites. In this paper, we present several new references for the a.d. 1239 and a.d. 1354 solar eclipses, most of them from unpublished Spanish documents. In particular, we study three records engraved on stones whose existence was not known until recently. Such records are very rare in the rest of Europe. The study of ancient eclipses has proven to be useful for obtaining some astronomical data of interest to modern astronomy. In particular, the analysis of these eclipses may be useful for determining a range of ΔT for the epochs.Part of this work was supported by a grant AICO/2015/037 from Generalitat Valenciana
THE FOOD INDUSTRY - 2000 A.D. REVISITED
No full textWhat will be the nature of the food industry in the year 2000 A.D.? What will be the roles of retailers, wholesalers and manufacturers? The author presents his views of future food processing and distribution practices and thereby poses a challenge to the industry to maximize its opportunities for growth during the next three decades.Agribusiness,
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