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Research papers published in 1994

Browse publicly accessible academic documents published in 1994.

903 documents

CNN universal chip in CMOS technology

Domínguez Castro, Rafael · Espejo Meana, Servando Carlos · Rodríguez Vázquez, Ángel Benito

1994Publisher: Institute of Electrical and Electronics EngineersRepository: idUS — Universidad de Sevilla

This paper describes the design of a CNN universal chip in a standard CMOS technology. The core of the chip consists of an array of 32×32 completely programmable CNN cells. Input image can be loaded in optical or electrical form. Accuracy is in the range of 7-8 bit, and cell…

DOI: 10.1109/CNNA.1994.381701

Los medios de comunicación a distancia

Sevillano García, María Luisa

1994Repository: idUS — Universidad de Sevilla

Vivimos un interesante momento en cuanto al desarrollo de las nuevas tecnologías y las oportunidades que estas abren para el almacenamiento, distribución, actualización, manejo y presentación de información. Para las Universidades a Distancia, el desafío consiste en proporcionar…

Sobre la estabilización de soluciones acuosas de nitroprusiato sódico

Fresno, Mª. J. · Sellés, E. · Fernández, M. C.

1994Publisher: Universidad de Granada, Facultad de Farmacia.Repository: DIGIBUG — Universidad de Granada

Se estudia la influencia que pueden ejercer el citrato trisódico y el manitol en la estabilidad de las soluciones de nitroprusiato sódico. Así mismo se compara el grado de fotoestabilidad de dicho fánnaco cuando se utilizan envases de vidrio incoloro y topacio. Se concluye que…

Analysis of expression of the argC and argD genes in the cyanobacterium Anabaena sp. strain PCC 7120.

Herrero Moreno, Antonia · Flores García, Enrique · Floriano Pardal, María Belen

1994Publisher: American Society for MicrobiologyRepository: idUS — Universidad de Sevilla

A cloned DNA fragment from Anabaena sp. strain PCC 7120 that complements an arginine auxotrophic mutant from the same organism was found to include an open reading frame encoding a 427-residue polypeptide that is homologous to N-acetylornithine aminotransferase from Bacillus…

De la fundación de asido

Montañés Caballero, Salvador · Escacena Carrasco, José Luis · Ladrón De Guevara Sánchez, Inmaculada + 1 author

1994Repository: idUS — Universidad de Sevilla

El hallazgo reciente de materiales arqueológicos de época tartésica en la periferia del actual casco urbano de Medina Sidonia, en la provincia de Cádiz, ha venido a confirmar la tradición historiográfica que remonta la fundación de la ciudad a los tiempos de la colonización…

DOI: 10.12795/spal.1994.i3.07

NADP(+)-isocitrate dehydrogenase from the cyanobacterium Anabaena sp. strain PCC 7120: purification and characterization of the enzyme and cloning, sequencing, and disruption of the icd gene

Muro Pastor, María Isabel · Florencio Bellido, Francisco Javier

1994Publisher: American Society for MicrobiologyRepository: idUS — Universidad de Sevilla

NADP(+)-isocitrate dehydrogenase (NADP(+)-IDH) from the dinitrogen-fixing filamentous cyanobacterium Anabaena sp. strain PCC 7120 was purified to homogeneity. The native enzyme is composed of two identical subunits (M(r), 57,000) and cross-reacts with antibodies obtained against…

A discrete-time equivalent system approach to the periodic response of nonlinear autonomous circuits

Palà Schönwälder, Pere · Miró Sans, Joan Maria

1994Repository: UPCommons — Universitat Politècnica de Catalunya

The problem of computing the steady state response of nonlinear autonomous circuits is solved making use of a discrete-time equivalent system approach. With the application of an s-plane to z-plane mapping, the circuit equations are discretized and written in vector form. Using…

DOI: 10.1109/ISCAS.1994.409520

La información de medicamentos y las revistas profesionales farmacéuticas

Trigo, M. M. · García-López, J. A. · García-López, M. A.

1994Publisher: Universidad de Granada, Facultad de Farmacia.Repository: DIGIBUG — Universidad de Granada

Se describen las características y se cuantifican los contenidos de II revistas profesionales fannacéuticas recibidas, gratuitamente, en una oficina de fannacia durante un año. Los 110 números recibidos incluían 7.463 páginas cuyos contenidos han sido clasificados en: noticias…

Multiplicity and oscillations in a model for catalyzed oxidation of carbon monoxide

Lemos Fernández, María del Carmen · Córdoba Zurita, Antonio

1994Publisher: American Institute of Physics Publising LLCRepository: idUS — Universidad de Sevilla

We extend a model proposed for explaining multiplicity and oscillations of concentrations and temperature in catalyzed oxidation of carbon monoxide; the importance of the dimension of the system and the closure approximation applied to the results, and, especially to the…

DOI: 10.1103/PhysRevB.49.14648

Dislog - a system for reasoning in disjunctive deductive databases

Seipel, Dietmar · Thöne, Helmut

1994Publisher: Universitat Politècnica de Catalunya. Departament de Llenguatges i Sistemes InformàticsRepository: UPCommons — Universitat Politècnica de Catalunya

DisLoG is a system for reasoning in disjunctive -deductive databases. It seeks to combine features of disjunctive logic programming, such as the support for incomplete information, with those of deductive databases, such as all-result inference capabilities. Severa} basic…

The use of fuzzy connectives to design real-coded genetic algorithms

Herrera Triguero, Francisco · Lozano, M. · Verdegay, José Luis

1994Publisher: Universitat Politècnica de Catalunya. Secció de Matemàtiques i InformàticaRepository: UPCommons — Universitat Politècnica de Catalunya

Genetic algorithms are adaptive methods that use principles inspired by natural population genetics to evolve solutions to search and optimization problems. Genetic algorithms process a population of search space solutions with three operations: selection, crossover and…

Aplicación del método inverso al análisis de ensayos de pozos petrolíferos

Savioli, Gabriela B. · Bidner, M. S.

1994Publisher: Centro Internacional de Métodos Numéricos en IngenieríaRepository: UPCommons — Universitat Politècnica de Catalunya

Se estiman parámetros característicos de un reservorio petrolíefro ajustando un modelo matemático a mediciones de presión realizadas durante un ensayo de pozo. Para lograrlo se utilizan técnicas de optimización cnon restricciones físicas en las variables. El modelo matemático…

Research issues in data modeling for scientific visualization

Nielson, Gregory M · Brunet Crosa, Pere · Gross, Markus + 2 authors

1994Repository: UPCommons — Universitat Politècnica de Catalunya

This article summarizes some topics of modeling as they impinge on the future development of scientific data visualization. The benefits from visualization techniques in analyzing data are well established, but to build on these pioneering efforts, one must recognize modeling as…

DOI: 10.1109/38.267475

Modelo de simulación de sistemas de drenaje operados por bombeo

Sánchez Bribiesca, José L. · Fuentes Mariles, Óscar Arturo · Gràcia Sabaté, Francesc Xavier

1994Repository: UPCommons — Universitat Politècnica de Catalunya

Se describe un modelo matemático que simula el funcionamiento de sistemas de drenaje operados por bombeo teniendo en cuenta la forma de trabajo de las bombas, según sus curvas de operación y el flujo transitorio en los conductos del sistema. Se comentan las posibles formas de…

Equalization and space diversity techniques in mobile environments

Valdominos Bardají, Antonio · Casadevall Palacio, Fernando José

1994Repository: UPCommons — Universitat Politècnica de Catalunya

The development of high-quality digital mobile radio systems has become a major goal in the field of digital communications. The possibility of providing speech and data services free of wire constrictions in different environments is a very attractive proposition, supported by…

DOI: 10.1109/65.272939

Modelado físico de transistores MESFET y HEMT

Lázaro, A · Pradell i Cara, Lluís · Torres Torres, Francisco

1994Repository: UPCommons — Universitat Politècnica de Catalunya

Models are developed for the de I-V curves and microwave small-signal parameters of the GaAs MESFET and HEMT. In the first step, the concept of a local small-signal equivalent circuit is introduced. In the second step, a formulation of the

Average power prediction in microcells

Ruiz Boqué, Sílvia · Fernández, M

1994Publisher: Institute of Electrical and Electronics Engineers (IEEE)Repository: UPCommons — Universitat Politècnica de Catalunya

A propagation model to estimate the average received power in an urban microcell environment has been developed. This model can be used both in line of sight (LOS) and non line of sight (NLOS) conditions in any regular or irregular microcell structure.

DOI: 10.1109/VETEC.1994.345133

State merging and state splitting via state assignment: a new FSM synthesis algorithm

Avedillo de Juan, María José · Quintana Toledo, José María · Huertas Díaz, José Luis

1994Publisher: Institute of Electrical and Electronics EngineersRepository: idUS — Universidad de Sevilla

The authors describe a state assignment algorithm for FSMs which produces an assignment of non-necessarily distinct, and eventually, incompletely specified codes. In this new approach, state-reduction and state assignment are dealt with concurrently, and a restricted state…

DOI: 10.1049/ip-cdt:19941228

Estudio en disolución de quelatos del ácido C-bencil-iminodiacético con iones metálicos divaletnes de transición y post-transición

Abarca, M. E. · González, J. M. · González, S. + 1 author

1994Publisher: Universidad de Granada, Facultad de Farmacia.Repository: DIGIBUG — Universidad de Granada

Los estudios potenciométrico, conductimétrico y espectro fotométrico, de sistemas acuosos H2L/M(II) del ácido C-benciliminodiacético [H2L = C-Bz-IDA 0CH2N(CH2C02H2] con cationes M(II) (M = Cu, Ni, Co, Zn, Cd y Pb) revelan la formación de especies MHL, ML Y ML2-2. La comparación…

Càlcul II : Problemes 4

Serra Albó, Oriol · Victoria Monge, Carlos

1994Repository: UPCommons — Universitat Politècnica de Catalunya

Building symbolic representations of intuitive real-time skills from performance data

D. Michie · R. Camacho

1994Repository: Repositório Aberto — Universidade do Porto

Real-time control skills are ordinarily tacit - their possessors cannot explicitly communicate them. But given sucient sampling of a trained expert's input-output behaviour, machine learning programs have been found capable of constructing rules which, when run as programs…

Comparison of the ATB 32A system and the Vitek ANI card in the identification of anaerobic bacteria

Gutiérrez Fernández, José · Nogales, M.C. · Martín Mazuelos, Estrella

1994Publisher: The Faculty PressRepository: DIGIBUG — Universidad de Granada

The ATB 32A system (BioMerieux, France) and the ANI card (AutoMicrobic System, Vitek System lnc., USA) were evaluated for their reliability in identifying 54 Gram-negative bacilli, 22 Gram-positive cocci and 24 Gram-positive bacilli, isolated from clinical specimens. Four…

Lukasiewicz logic based Prolog

Klawonn, Frank · Kruse, Rudolf

1994Publisher: Universitat Politècnica de Catalunya. Secció de Matemàtiques i InformàticaRepository: UPCommons — Universitat Politècnica de Catalunya

Prolog is a programming language based on a restricted subset of classical first order predicate logic. In order to overcome some problems of classical logic to handle imperfect human knowledge, we provide a formal framework for a Lukasiewicz logic based Prolog system. The use…