23 research outputs found

    Els Fonaments canviants de la qu铆mica anal铆tica

    Get PDF
    The features of the physico-chemical background of analytical chemistry, as it was viewed during the first half of this century, is first described. The impact of the massive introduction of instrumentation and separation techniques is discussed, and the start of a change of analytical chemistry in the direction to become a science of measurement is signaled. The "third revolution" is defined as derived not only from automation of instruments, procedures and laboratories and from computerization, but also from the use of chemometrics, and from the increasing importance of the socio-chemical problems in which analytical scientists are involved. Chemometrics and physical chemistry now build up the unifying background of analytical chemistry, which was so much diversified by instrumentation into almost independent subdisciplines. 33 references

    Discurs del President de l'Institut d'Estudis Catalans

    Get PDF

    Els Cient铆fics enfront dels perills nuclears

    Get PDF

    Paper de l'Institut d'Estudis Catalans dins una organitzaci贸 de la recerca cient铆fica a Catalunya

    Get PDF
    脡s analitzada la validesa dels objectius fundacionals de l'Institut d'Estudis Catalans (IEC) en el moment actual, en relaci贸 amb l'adequaci贸 d'aquests objectius a l'estat present de l'activitat cient铆fica a Catalunya i al seu desenvolupament previsible. Hom fa l'estudi de les estructures que constitueixen l'IEC i del tipus d'activitats que han pogut emprendre al llarg de llur evoluci贸 hist貌rica, amb vista a fixar la v脿lua potencial de l'IEC dins una organitzaci贸 de ]a recerca a Catalunya

    Pauling, Premi Nobel de la pau

    Get PDF

    Desenvolupament d'un sistema expert per a l'estudi de l'especiaci贸 qu铆mica

    Get PDF
    脡s generalment acceptat que 1'especiaci贸 qu铆mica consisteix en la determinaci贸 de les diferents formes f铆sico-qu铆miques d'un element, el conjunt de les quals ens d贸na la concentraci贸 total d'aquest en un sistema particular. L'especiaci贸 qu铆mica pot 茅sser estudiada mitjan莽ant c脿lculs basats en els equilibris existents en el sistema. Han estat elaborats molts programes, amb llurs pr貌pies bases de dades, capa莽os de dur a terme aquests c脿lculs, encara que, en general, s贸n d'aplicaci贸 m茅s aviat restringida. La finalitat del present projecte es la de desenvolupar un sistema expert per a 1'estudi de 1'especiaci贸 qu铆mica (Joint Expert Speciation System, JESS), 茅s a dir, un conjunt de programes de c脿lcul que inclour脿 una base de dades i un ajut 芦expert禄 que ha de guiar sempre l'usuari.Speciation is now accepted as meaning the different physico-chemical forms of an element that make up its total concentration in a particular environment. One way of determining speciation is to perform equilibrium calculations. Many programs exist that do such calculations, each with their own databases and most with rather restricted applications. The aim of the project is to develop a joint Expert Speciation System (JESS), a general equilibrium calculation and database package that will include an 芦expert禄 facility which will guide the user at all times
    corecore