Search results for "Operand"
showing 10 items of 11 documents
From algorithmic computing to direct retrieval: Evidence from number and alphabetic arithmetic in children and adults
1998
A number of theories of mental arithmetic suggest that the ability to solve simple addition and subtraction problems develops from an algorithmic strategy toward a strategy based on the direct retrieval of the result from memory. In the experiment presented here, 2nd and 12th graders were asked to solve two tasks of number and alphabet arithmetic. The subjects transformed series of 1 to 4 numbers or letters (item span) by adding or subtracting an operand varying from 1 to 4 (operation span). Although both the item and operation span were associated with major and identical effects in the case of both numbers and letters at 2nd grade, such effects were clearly observable only in the case of …
La committenza gesuitica e la pittura a Palermo tra XVI e XVIII secolo
Il presente lavoro di ricerca mira ad approfondire e arricchire, mediante nuove acquisizioni, lo studio in merito alle opere pittoriche di committenza gesuitica custodite presso le fondazioni palermitane dell’Ordine: chiesa del Gesù a Casa Professa, Collegio Massimo dei Gesuiti, chiesa di San Stanislao Kostka e chiesa di San Francesco Saverio. A queste si aggiungono i dipinti di committenza della Compagnia trasferiti presso altre sedi. Ulteriore intento è quello di organizzare in maniera più organica la trattazione delle commissioni artistiche dell’Ordine a Palermo, che si presentava dispersiva e frammentaria. Tra i risultati più significativi si annovera il ritrovamento di un ciclo di affr…
Algorithmic Solution of Arithmetic Problems and Operands-Answer Associations in Long-Term Memory
2001
Many developmental models of arithmetic problem solving assume that any algorithmic solution of a given problem results in an association of the two operands and the answer in memory (Logan & Klapp, 1991; Siegler, 1996). In this experiment, adults had to perform either an operation or a comparison on the same pairs of two-digit numbers and then a recognition task. It is shown that unlike comparisons, the algorithmic solution of operations impairs the recognition of operands in adults. Thus, the postulate of a necessary and automatic storage of operands-answer associations in memory when young children solve additions by algorithmic strategies needs to be qualified.
Il diritto islamico nel sistema delle fonti normative dell'ordinamento iraniano
2011
The essay aims to analyze the Iranian legal order by dweeling upon the connection between the religious legal sources and the secular ones. The acknowledgement of an apical right, whose origin is divine, coexists indeed with the law-making process provisions. In particular, the Author stresses the distinctive features and inherent contradictions of this legal order, which is defined as a "constitutional theocracy". Furthermore, the Author also addresses the duties of the Council of Guardians, which plays a central role in the definition of the hierarchy of legal sources, working both as interpreter of the Constitution and as controller of the compliance of ordinary and constitutional laws w…
Fixed-size Quadruples for a New, Hardware-Oriented Representation of the 4D Clifford Algebra
2010
Clifford algebra (geometric algebra) offers a natural and intuitive way to model geometry in fields as robotics, machine vision and computer graphics. This paper proposes a new representation based on fixed-size elements (quadruples) of 4D Clifford algebra and demonstrates that this choice leads to an algorithmic simplification which in turn leads to a simpler and more compact hardware implementation of the algebraic operations. In order to prove the advantages of the new, quadruple-based representation over the classical representation based on homogeneous elements, a coprocessing core supporting the new fixed-size Clifford operands, namely Quad-CliffoSor (Quadruple-based Clifford coproces…
An FPGA Implementation of a Quadruple-Based Multiplier for 4D Clifford Algebra
2008
Geometric or Clifford algebra is an interesting paradigm for geometric modeling in fields as computer graphics, machine vision and robotics. In these areas the research effort is actually aimed at finding an efficient implementation of geometric algebra. The best way to exploit the symbolic computing power of geometric algebra is to support its data types and operators directly in hardware. However the natural representation of the algebra elements as variable-length objects causes some problems in the case of a hardware implementation. This paper proposes a 4D Clifford algebra in which the variable-length elements are mapped into fixed-length elements (quadruples). This choice leads to a s…
Epistemic and didactic values of the demonstrative process in different cultures: a case study in Geometry with Chinese and Italian students
2011
Observaciones sobre una reflexión heterodoxa en los Comentarii de Juan Luis Vives a la Ciudad de Dios de San Agustín
2019
The Patres ecclesiae?s works were a frequent topic of discussion at the time in which many humanists stood against the decadent medieval scholastics. That Juan Luis Vives was part of this tradition is demonstrated in his commentaries on Saint Augustine works. Despite its pedagogical function, the scholia of the Valencian author became quite subjective. In this sense, his ecdotic work or, specially, his «criticisms and censures» can be mentioned. Here, Vives strongly disapproves of the intense political and intellectual turmoil of his epoch. Thus, this article is aimed at describing those annotations in which Vives adopts such an Erasmist point of view to comment Augustine?s De Civitate Dei.…
Formation and growth of palladium nanoparticles inside porous poly(4-vinyl-pyridine) monitored by operando techniques: The role of different reducing…
2017
In this work we followed the formation of palladium nanoparticles, starting from palladium (II) acetate precursor, inside a poly(4-vinylpyridine-co-divinylbenzene) polymer in presence of different reducing agents. The formation and growth of palladium nanoparticles in presence of H-2 was followed as a function of temperature by simultaneous XANES-SAXS techniques, coupled with DRIFT spectroscopy in operando conditions. It was found that the pyridyl functional groups in the polymer plays a fundamental role in the stabilization of the palladium (II) acetate precursor, as well as in the stabilization of the palladium nanoparticles. The effect of a thermal treatment in alcohol (ethanol and 2-pro…
Patrones de abuso sexual infantil y su relación con características de personalidad
2014
En este trabajo hemos estudiado las diferentes conductas abusivas en una muestra de sujetos condenados por abuso sexual y su relación con variables de personalidad. Nuestros datos apoyan que las distintas conductas abusivas estudiadas en relación al abuso sexual de menores, se agrupan en patrones o “estilos abusivos”, que guardan relación entre sí y que permiten diferenciar unos sujetos de otros en función de las prácticas abusivas.• Nuestros resultados apoyan también que el grupo de abusadores sexuales de menores es muy heterogéneo en cuanto a características de personalidad y que, como grupo, no presenta puntuaciones elevadas en ninguna de las escalas de personalidad o psicopatología eval…