219,303 research outputs found
The application of high temperature superconducting materials to power switches
No full textSuperconducting switches may nd application in superconducting magnet systems that
require energy extraction. Such superconducting switches could be bypass-switches that
are operated in conjunction with a parallel resistor or dump-switches where all of the
energy is dissipated in the switch itself. Bypass-switches are more suited to higher energy
circuits as a portion of the energy can be dissipated in the external dump resistor. Dump-switches
require less material and triggering energy as a lower switch resistance is needed
to achieve the required total dump resistance.Both superconducting bypass-switches and superconducting dump-switches can be thermally
activated. Switching times that are comparable to those obtained with mechanical
bypass-switch systems can be achieved using a co-wound heater that is powered by a capacitor
discharge. Switches that have fast thermal diffusion times through the insulation
can be modelled as a lumped system whereas those with slow thermal diffusion times were
modelled with the full heat diffusion equation.Superconducting switches can be formed of either high temperature superconductors
(HTS) or low temperature superconductors (LTS). Switches based on HTS materials allow
operation at higher temperatures where the cost of cooling is less. Extracting the magnet
energy and depositing the heater energy at higher temperatures will also reduce the load on
the overall cryogenic system during switching and energy extraction. For magnet circuits
that are based on high temperature superconductors the switch must also be formed of
HTS material. Due to the approximately T3 dependence of specific heat capacity, switches
that operate at higher temperatures have slower heat diffusion times and require higher
triggering energies than those operating at low temperature. HTS based dump-switches
and HTS based bypass-switches were tested in liquid nitrogen to show that the required
switching time could be achieved at these high temperatures.The design and optimisation of superconducting switches that were formed of various
superconducting materials were performed for example magnet circuits to provide reference
designs of switches. These example circuits were based on selected Large Hadron Collider
600 A circuits that had a stored energy of 5.5 kJ. Superconducting switches may also nd
application in magnet circuits with higher transport currents and higher energies. The
scaling and suitability of the reference designs to higher energy circuits was also described
March AB, March AB1: new March tests for unlinked dynamic memory faults
No full textAmong the different types of algorithms proposed to test static random access memories (SRAMs), March tests have proven to be faster, simpler and regularly structured. New memory production technologies introduce new classes of faults usually referred to as dynamic memory faults. A few March tests for dynamic fault, with different fault coverage, have been published. In this paper, we propose new March tests targeting unlinked dynamic faults with lower complexity than published ones. Comparison results show that the proposed March tests provide the same fault coverage of the known ones, but they reduce the test complexity, and therefore the test tim
Stable voters in an unstable party environment : continuity and change in Italian electoral behaviour
No full textM.24981-1999 Paolo Segatti, Paolo Bellucci and Marco Maraffi. 30 cm. A previous version of this paper was presented at a symposium on Political Parties : Changing Roles in Contemporary Democracies, held at the Center for Advanced Study in the Social Sciences of the Juan March Institute, Madrid, December 15-17, 1994. -- P.1. Includes bibliographical references (p. 56-59
Jack and the Bean-Stalk
No full textChapbook with some colored illustrations.
The story of Jack and the Beanstalk, where Jack trades a cow for some magic beans. The beans grow into a giant stalk into the sky, where Jack encounters giants. Jack is pursued by the giant and escapes down the stalk, which he cuts down causing the giant to fall to his death.Publication date range and identification of printer based on years that James March, the younger, operated at address given in imprint, according to P.A.H. Brown, London publishers and printers (1982), p. 123.Chapbooks; Fables; Fairytales;Gift of Pamela K. Hare
Automatic March tests generation for static and dynamic faults in SRAMs
No full textNew memory production modern technologies introduce new classes of faults usually referred to as dynamic memory faults. Although some hand-made March tests to deal with these new faults have been published, the problem of automatically generate March tests for dynamic faults has still to be addressed, in this paper we propose a new approach to automatically generate March tests with minimal length for both static and dynamic faults. The proposed approach resorts to a formal model to represent faulty behaviors in a memory and to simplify the generation of the corresponding tests
Towards the integration of animal-borne instruments into global ocean observing systems
No full text<p>This release corresponds to the code used for the first draft of the paper "Towards the integration of animal-borne instruments into global ocean observing systems"</p>
Variations on the Author
No full text“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
Exploring customer trust and relationships in the online environment
No full textThis thesis presents eleven selected publications concerning trust and relationships in the online environment. The evolution of the research over ten years showcases the author’s dedication to the practical application of marketing for the benefit of organisations and individuals alongside contribution to academic knowledge.
The advent of new technology by way of the internet has added a new dimension to the complexity of marketing strategy and, from a practical point of view, marketers need to incorporate cutting edge technology into their strategic thinking. Existing literature at the time that the author started this research was at the nascent stage and over the period of the research, it became obvious that technology could be used as a tool to help build relationships. Conversely, customers demonstrated varying degrees of trust in both the technologies and the organisations using online-based tools. It became essential, therefore, for organisations to appear trustworthy in order for customers to engage with online marketing platforms and subsequently entrust their purchasing activities to the online environment.
The research appraised in this thesis makes a significant contribution to knowledge about marketing in the online environment and the implications of engendering consumer trust. Six key contributions to knowledge are claimed as a result of this work. Firstly, a framework for using online marketing strategically has been developed. Secondly, an analysis of how online marketing fits into the traditional marketing framework is provided. Thirdly, the author introduces the notion that trust in a brand influences online behaviour by reducing perceived risk, leading to consumers committing to online purchasing. Fourthly, online brand elements used to create credibility of a B2B brand are identified. Fifthly, the author presents an identification of how structural elements of websites can be utilized to differentiate online brands from competitors’ offerings. Finally, the author puts forward the proposition that marketers can learn from relatiaonships between contributors to online social networks.
The researcher has utilised a variety of deliberately chosen methodologies, most of which are qualitative. The thesis also contains three secondary contributions related to research design. These are the use of a bought-in, permission-based email list, the innovative use of netnography to elicit rich data from online discussion forums and, finally, content analysis of websites. The work concludes by offering eight recommendations for future research directions
March Test Generation Revealed
No full textMemory testing commonly faces two issues: the characterization of detailed and realistic fault models and the definition of time-efficient test algorithms. Among the different types of algorithms proposed for testing static random access memories, march tests have proven to be faster, simpler, and regularly structured. The majority of the published march tests have been manually generated. Unfortunately, the continuous evolution of the memory technology introduces new classes of faults such as dynamic and linked faults and makes the task of handwriting test algorithms harder and not always leading to optimal results. Although some researchers published handmade march tests able to deal with new fault models, the problem of a comprehensive methodology to automatically generate march tests addressing both classic and new fault models is still an open issue. This paper proposes a new polynomial algorithm to automatically generate march tests. The formal model adopted to represent memory faults allows the definition of a general methodology to deal with static, dynamic, and linked faults. Experimental results show that the new automatically generated march tests reduce the test complexity and, therefore, the test time, compared to the well-known state of the art in memory testin
- …
