1,721,011 research outputs found
Photoexcited iron porphyrins as biomimetic catalysts
No full textPhotoexcited iron porphyrins can ne of some interest in both fine and industrial chemistry in view of preparing new efficient biomimetic catalysts, working with high selectivity under mild temperature and pressure
Zerologia. Sullo zero, il vuoto e il nulla
No full textLa macchina della conoscenza umana ha bisogno della grammatica del non. Perché lo zero, il vuoto e il nulla ci consentono di sporgerci su ciò che non sappiamo ancora, su quel non sapere che sempre circonda ciò che crediamo di sapere. Lo zero, il vuoto, il nulla, che cosa accomuna questi tre concetti? Di certo lo scandalo del paradosso: un numero per il «non essere», indispensabile ma inafferrabile; un «vuoto» che «riempie» la nostra vita quotidiana e che resta un’idea di frontiera della fisica moderna; un’assenza e una mancanza, una negazione effervescente e pensosa che ci attrae fino ai bordi del mondo.three former schoolmates reunite and explore the mathematical concept of zero, the physical one of the void and the philosophical one of nothing, thus re-iterating an adventure that has accompanied the entire history of thought. What do these three concepts have in common? Surely an embarrassing paradox: a number representing “non-existence”, an indispensable but basically impenetrable notion; a vacuum that “fills” our daily lives and remains a cutting-edge idea in modern physics; an absence, a deficiency, a sparkling and thought-provoking negation that draws us to the brink of reality. That oval-shaped symbol may seem sterile, but it can be a source of endless amusement
Zerologia. Sullo zero, il vuoto e il nulla
No full textLa macchina della conoscenza umana ha bisogno della grammatica del non. Perché lo zero, il vuoto e il nulla ci consentono di sporgerci su ciò che non sappiamo ancora, su quel non sapere che sempre circonda ciò che crediamo di sapere. Lo zero, il vuoto, il nulla, che cosa accomuna questi tre concetti? Di certo lo scandalo del paradosso: un numero per il «non essere», indispensabile ma inafferrabile; un «vuoto» che «riempie» la nostra vita quotidiana e che resta un’idea di frontiera della fisica moderna; un’assenza e una mancanza, una negazione effervescente e pensosa che ci attrae fino ai bordi del mondo.three former schoolmates reunite and explore the mathematical concept of zero, the physical one of the void and the philosophical one of nothing, thus re-iterating an adventure that has accompanied the entire history of thought. What do these three concepts have in common? Surely an embarrassing paradox: a number representing “non-existence”, an indispensable but basically impenetrable notion; a vacuum that “fills” our daily lives and remains a cutting-edge idea in modern physics; an absence, a deficiency, a sparkling and thought-provoking negation that draws us to the brink of reality. That oval-shaped symbol may seem sterile, but it can be a source of endless amusement
Cyclo-oxygenase- and capsaicin-sensitive afferent fibres affect beta-adrenoceptor-evoked response in the rat urinary bladder
No full textCategorial mirror symmetry on K3 surfaces
No full textWe study the structure of a modified Fukaya category F(X) associated with a K3 surface X, and prove that whenever X is an elliptic K3 surface with a section, the derived category of F(X) is equivalent to a subcategory of the derived category D((X) over cap) of coherent sheaves on the mirror K3 surface (X) over cap
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
- …
