Search results for "metrica"
showing 10 items of 196 documents
Composizione granulometrica e mineralogica
2011
Computing bi-tangents for transmission belts
2020
In this note, we determine the bi-tangents of two rotated ellipses, and we compute the coordinates of their points of tangency. For these purposes, we develop two approaches. The first one is an analytical approach in which we compute analytically the equations of the bi-tangents. This approach is valid only for some cases. The second one is geometrical and is based on the determination of the normal vector to the tangent line. This approach turns out to be more robust than the first one and is valid for any configuration of ellipses.
Dwuizbowy parlament i reformy instytucjonalne w Republice Włoskiej
2019
Parlamenty z natury są instytucjami dwoistymi, gdyż łączą społeczeństwo z prawną strukturą władzy państwowej. Analiza właściwości strukturalnych współczesnych legislatyw wskazuje, że szczególnie istotny jest czynnik organizacji wewnętrznej pozwalający wyodrębnić bikameralizm symetryczny. Przypadek Republiki Włoskiej przyciąga badaczy ustrojów politycznych z wielu powodów. Między innymi z tego względu, że obie izby posiadają identyczną pozycję prawnoustrojową, taką samą długość pięcioletniej kadencji oraz dysponują identycznymi kompetencjami. Proporcjonalna ordynacja wyborcza (poza dwoma wyjątkami) gwarantowała, że legislatywa była lustrzanym odbiciem społeczeństwa, umożliwiając spotkanie ró…
The Geometry of a Domed Architecture: A Stately Example of Kārbandi at Bagh-e Dolat Abad in Yazd
2016
This paper analyses the kārbandi of the Hashti pavilion at Bagh-e-Dolat Abad in Yazd. Kārbandi is a spatial system obtained through the projection of a star-shaped drawing onto a curved surface. It is characterised by a complex use of geometry and repetitive symmetry. The analysis of its geometrical aspects contributes to an understanding of the traditional rules underlying the original design. The kārbandi of the octagonal vestibule of the Hashti pavilion consists of a complex roof system that completes the octagonal volume of the room below; its intrados presents a pattern of interlocking ribbed arches. The paper also looks at the drawings, module and proportions of the Hashti pavilion, w…
Airy-function approach to binary black hole merger waveforms: The fold-caustic diffraction model
2022
From numerical simulations of the Einstein equations, and also from gravitational wave observations, the gravitational wave signal from a binary black hole merger is seen to be simple and to possess certain universal features. The simplicity is somewhat surprising given that non-linearities of general relativity are thought to play an important role at the merger. The universal features include an increasing amplitude as we approach the merger, where transition from an oscillatory to a damped regime occurs in a pattern apparently oblivious to the initial conditions. We propose an Airy-function pattern to model the binary black hole (BBH) merger waveform, focusing on accounting for its simpl…
Untersuchungen zur Biosynthese eines Cytokinins in Calluszellen von Laubmoossporophyten
1973
When callus cells derived from the sporogon of the hybrid Funaria hygrometrica x Physcomitrium piriforme are supplied with adenine-8-14C, they produce a labelled cytokinin which has the same chromatographic behavior as N6-γγ-(dimethylallyl)aminopurine. The cytokinin is the first radioactive product that can be detected in the culture medium. It is formed as long as labelled adenine is available. When callus cells are grown in an optimum culture medium containing amino acids, about 10% of the radioactivity supplied as adenine is found in the cytokinin. When the cells are grown in a medium without amino acids, the RNA-content of the cells and the total yield of cytokinin decrease, but about 1…
Über den Ureidstoffwechsel beim Laubmoosprotonema von Funaria hydrometrica L. (Sibth.)1)1)Herrn Prof. Dr. Dr. Kurt Mothes zum 75. Geburtstag gewidmet.
1975
Summary The activity of allantoinase (EC 3.5.2.5) is influenced by light and darkness. The extracts of dark-grown moss protonema showed a very higher enzyme activity than the extracts of light-grown plants. The allantoinase activity was increased by light-dark and decreased by dark-light transitions. DMAP mimicked light effects by stabelizing the charakteristic light depending enzyme avctivities in the dark. The inhibitors DCMU, DNP and CCCP increased the enzyme activity of light-grown moss protonema, to some extend they induced a “physiological dark condition”.
Architettura e second digital turn, l’evoluzione degli strumenti informatici e il progetto
2021
La condizione digitale che ha gradualmente ibridato le nostre esistenze, trasformando atomi in bit, si è oggi cementificata sulla nostra società, arricchendone la postmodernità e determinando una nuova liquidità acuitasi con l’avvento di internet. Un momento storico segnato da una nuova maturità del digitale, evidente nel nostro diverso rapporto con i dati, e nella diffusione di metodi di machine learning avanzato, che promettono una nuova capacità di comprensione della complessità contemporanea e nel frattempo contribuiscono alla propagazione dell’apparato tecnico sul mondo. Questi cambiamenti, tanto profondi da toccare la nostra cultura, stanno modificando il nostro modo di interpretare e…
Modelli interoperabili per Cultural Heritage Recording. Le cupole a torrini di Sicilia e Castiglia.
La ricerca indaga l’origine e l’evoluzione di uno specifico modello di cupola su tamburo a pianta circolare o poligonale, con contrafforti cilindrici sull’asse dei piloni della crociera. Sei casi studio in Spagna e in Sicilia sono stati studiati attraverso il riesame delle fonti storiche e sono state analizzate le matrici geometriche sottese al progetto; i casi studio ancora esistenti sono stati rilevati con metodi laser scanning e fotogrammetrici. I modelli tridimensionali sono stati utilizzati per una verifica del contributo statico offerto dai torrini alla stabilità delle strutture. The research work is focused on the origin and the modifications of a peculiar dome on tambour having a ci…
L’alba in forma di romanza: sul tipo strofico e musicale di 'Reis glorios' (BdT 242,64)
2018
La famosa alba attribuita da alcuni canzonieri a Giraut de Borneil è stata ultimamente al centro di una serie di autorevoli contributi, concomitanti alla scoperta di un’antica traduzione italiana del testo provenzale, che hanno cercato di definirne meglio lo stemma, il testo critico e l’interpretazione. In questo contributo si discutono gli aspetti formali di Reis glorios con riguardo a tutta la tradizione (anche indiretta) e si propone d’individuare nel suo tipo metrico e musicale la cosiddetta ‘strofa di romanza’: essa caratterizza in particolare il corpus di canzoni di tela antico-francesi col quale l’alba provenzale mostra di condividere anche elementi stilistici e retorici. Questa agni…