-
21 Caprotti, Arturo
[br]b. 22 March 1881 Cremona, Italyd. 9 February 1938 Milan, Italy[br]Italian engineer, inventor of Caprotti poppet valve gear for steam locomotives.[br]Caprotti graduated as a mechanical engineer at Turin Royal Polytechnic College and spent some years in the motor car industry. After researching the application of poppet valves to railway locomotives, he invented his rotary cam valve gear for poppet valves in 1915. Compared with usual slide and piston valves and valve gears, it offered independent timing of inlet and exhaust valves and a saving in weight. Valve gear to Caprotti's design was first fitted in 1920 to a 2−6−0 locomotive of the Italian State Railways, and was subsequently widely used there and elsewhere. Caprotti valve gear was first applied in Britain in 1926 to a Claughton class 4−6−0 of the London, Midland \& Scottish Railway, resulting in substantial fuel savings compared with a similar locomotive fitted with Walschaert's valve gear and piston valves. Others of the class were then fitted similarly. Caprotti valve gear never came into general use in Britain and its final application was in 1954 to British Railways class 8 4−6−2 no. 71000; this was intended as the prototype of a class of standard locomotives for express trains, but the class was never built, because diesel and electric locomotives took their place. Some components survived scrapping, and a reconstruction of the locomotive is in working order.[br]Further ReadingJohn Marshall, 1978, A Biographical Dictionary of Railway Engineers, Newton Abbot: David \& Charles.P.Ransome-Wallis (ed.), 1959, The Concise Encyclopaedia of World Railway Locomotives, London: Hutchinson (contains a note about Caprotti (p. 497) and a description of the valve gear (p. 301).PJGR -
22 Memory
To what extent can we lump together what goes on when you try to recall: (1) your name; (2) how you kick a football; and (3) the present location of your car keys? If we use introspective evidence as a guide, the first seems an immediate automatic response. The second may require constructive internal replay prior to our being able to produce a verbal description. The third... quite likely involves complex operational responses under the control of some general strategy system. Is any unitary search process, with a single set of characteristics and inputoutput relations, likely to cover all these cases? (Reitman, 1970, p. 485)[Semantic memory] Is a mental thesaurus, organized knowledge a person possesses about words and other verbal symbols, their meanings and referents, about relations among them, and about rules, formulas, and algorithms for the manipulation of these symbols, concepts, and relations. Semantic memory does not register perceptible properties of inputs, but rather cognitive referents of input signals. (Tulving, 1972, p. 386)The mnemonic code, far from being fixed and unchangeable, is structured and restructured along with general development. Such a restructuring of the code takes place in close dependence on the schemes of intelligence. The clearest indication of this is the observation of different types of memory organisation in accordance with the age level of a child so that a longer interval of retention without any new presentation, far from causing a deterioration of memory, may actually improve it. (Piaget & Inhelder, 1973, p. 36)4) The Logic of Some Memory Theorization Is of Dubious Worth in the History of PsychologyIf a cue was effective in memory retrieval, then one could infer it was encoded; if a cue was not effective, then it was not encoded. The logic of this theorization is "heads I win, tails you lose" and is of dubious worth in the history of psychology. We might ask how long scientists will puzzle over questions with no answers. (Solso, 1974, p. 28)We have iconic, echoic, active, working, acoustic, articulatory, primary, secondary, episodic, semantic, short-term, intermediate-term, and longterm memories, and these memories contain tags, traces, images, attributes, markers, concepts, cognitive maps, natural-language mediators, kernel sentences, relational rules, nodes, associations, propositions, higher-order memory units, and features. (Eysenck, 1977, p. 4)The problem with the memory metaphor is that storage and retrieval of traces only deals [ sic] with old, previously articulated information. Memory traces can perhaps provide a basis for dealing with the "sameness" of the present experience with previous experiences, but the memory metaphor has no mechanisms for dealing with novel information. (Bransford, McCarrell, Franks & Nitsch, 1977, p. 434)7) The Results of a Hundred Years of the Psychological Study of Memory Are Somewhat DiscouragingThe results of a hundred years of the psychological study of memory are somewhat discouraging. We have established firm empirical generalisations, but most of them are so obvious that every ten-year-old knows them anyway. We have made discoveries, but they are only marginally about memory; in many cases we don't know what to do with them, and wear them out with endless experimental variations. We have an intellectually impressive group of theories, but history offers little confidence that they will provide any meaningful insight into natural behavior. (Neisser, 1978, pp. 12-13)A schema, then is a data structure for representing the generic concepts stored in memory. There are schemata representing our knowledge about all concepts; those underlying objects, situations, events, sequences of events, actions and sequences of actions. A schema contains, as part of its specification, the network of interrelations that is believed to normally hold among the constituents of the concept in question. A schema theory embodies a prototype theory of meaning. That is, inasmuch as a schema underlying a concept stored in memory corresponds to the mean ing of that concept, meanings are encoded in terms of the typical or normal situations or events that instantiate that concept. (Rumelhart, 1980, p. 34)Memory appears to be constrained by a structure, a "syntax," perhaps at quite a low level, but it is free to be variable, deviant, even erratic at a higher level....Like the information system of language, memory can be explained in part by the abstract rules which underlie it, but only in part. The rules provide a basic competence, but they do not fully determine performance. (Campbell, 1982, pp. 228, 229)When people think about the mind, they often liken it to a physical space, with memories and ideas as objects contained within that space. Thus, we speak of ideas being in the dark corners or dim recesses of our minds, and of holding ideas in mind. Ideas may be in the front or back of our minds, or they may be difficult to grasp. With respect to the processes involved in memory, we talk about storing memories, of searching or looking for lost memories, and sometimes of finding them. An examination of common parlance, therefore, suggests that there is general adherence to what might be called the spatial metaphor. The basic assumptions of this metaphor are that memories are treated as objects stored in specific locations within the mind, and the retrieval process involves a search through the mind in order to find specific memories....However, while the spatial metaphor has shown extraordinary longevity, there have been some interesting changes over time in the precise form of analogy used. In particular, technological advances have influenced theoretical conceptualisations.... The original Greek analogies were based on wax tablets and aviaries; these were superseded by analogies involving switchboards, gramophones, tape recorders, libraries, conveyor belts, and underground maps. Most recently, the workings of human memory have been compared to computer functioning... and it has been suggested that the various memory stores found in computers have their counterparts in the human memory system. (Eysenck, 1984, pp. 79-80)Primary memory [as proposed by William James] relates to information that remains in consciousness after it has been perceived, and thus forms part of the psychological present, whereas secondary memory contains information about events that have left consciousness, and are therefore part of the psychological past. (Eysenck, 1984, p. 86)Once psychologists began to study long-term memory per se, they realized it may be divided into two main categories.... Semantic memories have to do with our general knowledge about the working of the world. We know what cars do, what stoves do, what the laws of gravity are, and so on. Episodic memories are largely events that took place at a time and place in our personal history. Remembering specific events about our own actions, about our family, and about our individual past falls into this category. With amnesia or in aging, what dims... is our personal episodic memories, save for those that are especially dear or painful to us. Our knowledge of how the world works remains pretty much intact. (Gazzaniga, 1988, p. 42)The nature of memory... provides a natural starting point for an analysis of thinking. Memory is the repository of many of the beliefs and representations that enter into thinking, and the retrievability of these representations can limit the quality of our thought. (Smith, 1990, p. 1)Historical dictionary of quotations in cognitive science > Memory
- 1
- 2
См. также в других словарях:
Car of Tomorrow — is also the title of a 1951 film by Tex Avery. Car of Tomorrow may also refer to the new Nationwide Series car. Car of Tomorrow Technical specifications … Wikipedia
prototype — / prəυtətaɪp/ noun the first model of a new product before it goes into production ● a prototype car ● a prototype plane ● The company is showing the prototype of the new model at the exhibition … Marketing dictionary in english
Prototype (Motif de conception) — Prototype (patron de conception) Pour les articles homonymes, voir Prototype. Le patron de conception prototype est utilisé lorsque la création d une instance est complexe ou consommatrice en temps. Plutôt que créer plusieurs instances de la… … Wikipédia en Français
Prototype (motif de conception) — Prototype (patron de conception) Pour les articles homonymes, voir Prototype. Le patron de conception prototype est utilisé lorsque la création d une instance est complexe ou consommatrice en temps. Plutôt que créer plusieurs instances de la… … Wikipédia en Français
Prototype (jeu vidéo) — [PROTOTYPE] Éditeur Activision Développeur Radical Entertainment Mode de … Wikipédia en Français
prototype — [ prɔtɔtip ] n. m. • 1552; lat. prototypus; gr. prôtotupos « qui est le premier type » 1 ♦ Didact. Type, modèle premier (originel ou principal). ⇒ archétype, modèle, type. Prototype d une œuvre d art. ⇒ 1. original. « Ne croirait on pas [...] qu… … Encyclopédie Universelle
prototype — pro‧to‧type [ˈprəʊtətaɪp ǁ ˈproʊ ] noun [countable] MANUFACTURING the first form that a newly designed car, machine etc has: prototype of/for • a complete working prototype of the new model * * * prototype UK US /ˈprəʊtəʊtaɪp/ noun [C] ►… … Financial and business terms
Car and Track — was America s first nationally syndicated auto racing and car test television show. Produced by Car and Track Productions, it was hosted by Bud Lindemann, a famous race commentator of the time.It is believed to have run from 1967 to 1975, with 80 … Wikipedia
Car Academy — est une fiction déjantée, décalée et souvent parodique, basée sur des voitures de luxe, des top models et un humour volontairement potache, sortie en 2006. Objet avec succès d une campagne de promotion par des téléchargements partiels sur… … Wikipédia en Français
Prototype — A prototype is an original type, form, or instance of something serving as a typical example, basis, or standard for other things of the same category. The word derives from the Greek πρωτότυπον ( prototypon ), archetype, original , neutral of… … Wikipedia
Prototype Jack — Liste des personnages de Tekken Logo de Tekken. Voici la liste des personnages de Tekken, dans l ordre chronologique de leur apparition dans la série, puis dans l ordre alphabétique. Sommaire … Wikipédia en Français
