1,720,964 research outputs found
Microbiological and plant engineering aspects of phosphate biological removal
No full textBiological models and microbial populations involved in phosphate removal from wastewater are reviewed and compared
A City Car for Restricted Urban Trafic: Innovative Actuation and Manoeuvrability
No full text. Environmental compatibility requires artefact and service technological sustainability, so that prescriptions become cue for further innovation. The city-car case is considered, investigating the advantages of four independently powered wheels and exploring how actuation redundancy could be used to grant proper manoeuvrability, at least, within the expected duty range. The feasibility is shown by computer simulation (based on a 14-degrees-of-freedom model of the dynamics) and hints on the control opportunities are sketched in view of further developments
Restricted Urban Traffic Guidance of District-Dispatchers with Four Powered Wheels
No full textn° 3/4 Marzo-April
The Tyre-Soil Effects on the Manoeuvrability of a City-Car
No full textEco-compatibility aims at drastic changes of people transportation means and, to grant proper mobility levels, the electrically-powered city-car concept provides effective solutions. This quite obviously leads to distributed actuation, with separately driven wheels and inconsistencies appear unless redundancy and tyre/road interaction are properly mastered. The paper deals with the dynamics of such kind of vehicle moving from the behaviour of driven wheels (with compliant tyre and varying soil interactions); then a twin powered axle or train are investigated, as basic reference to describe the dynamics of a four wheels platform, driven by redundant actuation on varying friction soils. On these premises, a city car manoeuvre stability can be stated for low speed tasks over urban roads. Results are obtained, after modelling the wheel dynamics, with resort to computer simulation, based on the SIMULINK package; the kinematics constraints are introduced and the varying tyre-soil coupling conditions are relate d with the driving torque options
Influence of the ratio of the initial substrate concentration to biomass concentration on the performance of a sequencing batch reactor
No full textBiomass behaviour and COD removal in a benchscale activated sludge reactor have been studied alternating anaerobic and aerobic conditions. Particular attention has been paid to the influence of the ratio of the initial substrate concentration (S-0) to the initial biomass concentration (X(0)) on the reactor performance. Tests at very low ratios (S-0/X(0)<2) demonstrate the existence of a threshold below which the reactor performance is seriously affected (S-0/X(0)=0.5). Under conditions of total suppression of cell duplication, substrate maintenance requirements have also been calculated for the microbial consortium present in the activated sludges. The results obtained show that stressed biomass can survive conditions of substrate lack better than unstressed biomass
Italian standards for the design and construction of maritime structures
No full textThree Italian Standards for port and coastal structure design and construction are here presented. The first refers to the design and construction of the defence structures of the erosive beaches, second to design and construction of the maritime dikes, third to the design and construction of the big cranes and handling machines in the port areas
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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