Relevant bibliographies by topics / Basse velocità

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Basse velocità'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 February 2022

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Journal articles on the topic "Basse velocità"

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Pucci, Paola. "I territori dell'auto elettrica: oltre il paradigma urbanocentrico." ARCHIVIO DI STUDI URBANI E REGIONALI, no. 128 (August 2020): 14–37. http://dx.doi.org/10.3280/asur2020-128003.

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L'articolo propone quattro scenari per restituire diverse intensità/modalità/velocità di diffusione dei veicoli elettrici nella Regione urbana milanese. Gli scenari, costruiti con un'analisi multicriteri che analizza le relazioni tra mobilità elettrica, pratiche di mobilità, caratteristiche socio-economiche e insediative, offrono elementi per definire politiche di incentivo e di regolazione per una transizione sostenibile ed equa verso una mobilità a basse emissioni di carbonio.
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Alkargole, Hazim M., Abbas S. Hassan, and Raoof T. Hussein. "Analyze and Evaluate the Performance Velocity Control in DC Motor." Radioelectronics. Nanosystems. Information Technologies 12, no. 4 (December 1, 2020): 507–16. http://dx.doi.org/10.17725/rensit.2020.12.507.

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A mathematical model of controlling the DC motor has been applied in this paper. There are many and different types of controllers have been used with purpose of analyzing and evaluating the performance of the of DC motor which are, Fuzzy Logic Controller (FLC), Linear Quadratic Regulator (LQR), Fuzzy Proportional Derivative (FPD) ,Proportional Integral Derivative (PID), Fuzzy Proportional Derivative with integral (FPD plus I) , and Fuzzy Proportional Integral (FPI) with membership functions of 3*3, 5*5, and 7*7 rule bases. The results show that the (FLC) controller with 5*5 rule base provides the best results among all the other controllers to design the DC motor controller.
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Randolph, Brian W., Edward P. Steinhauser, Andrew G. Heydinger, and Jiwan D. Gupta. "In Situ Test for Hydraulic Conductivity of Drainable Bases." Transportation Research Record: Journal of the Transportation Research Board 1519, no. 1 (January 1996): 36–40. http://dx.doi.org/10.1177/0361198196151900105.

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The development and use of an in situ hydraulic conductivity test for drainable bases under existing pavements is presented. Six highway test sections were constructed by the Ohio Department of Transportation to test the drainage characteristics and durability of four unbound and two stabilized base materials. The in situ test was then used to determine the field hydraulic conductivity of the highway test section bases. This test uses an approach to Darcy's law called the direct velocity technique. A standpipe is placed in a cored hole in the pavement to establish steady-state horizontal flow through the base toward the edge drains. Two probes along a radial flow line measure differential pressure and electrical resistance in the water. An electrolytic solution injected at the standpipe is used to determine the water velocity as the median resistance is noted at each probe. The in situ hydraulic conductivity is calculated by dividing the discharge velocity by the hydraulic gradient. The in situ test provided results that compare favorably with published values from carefully controlled laboratory tests. It proved to work well for high-hydraulic-conductivity drainable bases, and it has the potential to be a valuable tool for condition assessment of bases under existing pavements.
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Menrad, Thorben, and Jürgen Edelmann-Nusser. "Validation of Velocity Measuring Devices in Velocity Based Strength Training." International Journal of Computer Science in Sport 20, no. 1 (January 1, 2021): 106–18. http://dx.doi.org/10.2478/ijcss-2021-0007.

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Abstract To control and monitor strength training with a barbell various systems are on the consumer market. They provide the user with information regarding velocity, acceleration and trajectory of the barbell. Some systems additionally calculate the 1-repetition-maximum (1RM) of exercises and use it to suggest individual intensities for future training. Three systems were tested: GymAware, PUSH Band 2.0 and Vmaxpro. The GymAware system bases on linear position transducers, PUSH Band 2.0 and Vmaxpro base on inertial measurement units. The aim of this paper was to determine the accuracy of the three systems with regard to the determination of the average velocity of each repetition of three barbell strength exercises (squat, barbell rowing, deadlift). The velocity data of the three systems were compared to a Vicon system using linear regression analyses and Bland-Altman-diagrams. In the linear regression analyses the smallest coefficient of determination (R2.) in each exercise can be observed for PUSH Band 2.0. In the Bland-Altman diagrams the mean value of the differences in the average velocities is near zero for all systems and all exercises. PUSH Band 2.0 has the largest differences between the Limits of Agreement. For GymAware and Vmaxpro these differences are comparable.
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Mei, Renwei, Ronald J. Adrian, and Thomas J. Hanratty. "Particle dispersion in isotropic turbulence under Stokes drag and Basset force with gravitational settling." Journal of Fluid Mechanics 225 (April 1991): 481–95. http://dx.doi.org/10.1017/s0022112091002136.

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An analysis that includes the effects of Basset and gravitational forces is presented for the dispersion of particles experiencing Stokes drag in isotropic turbulence. The fluid velocity correlation function evaluated on the particle trajectory is obtained by using the independence approximation and the assumption of Gaussian velocity distributions for both the fluid and the particle, formulated by Pismen & Nir (1978). The dynamic equation for particle motion with the Basset force is Fourier transformed to the frequency domain where it can be solved exactly. It is found that the Basset force has virtually no influence on the structure of the fluid velocity fluctuations seen by the particles or on particle diffusivities. It does, however, affect the motion of the particle by increasing (reducing) the intensities of particle turbulence for particles with larger (smaller) inertia. The crossing of trajectories associated with the gravitational force tends to enhance the effect of the Basset force on the particle turbulence. An ordering of the terms in the particle equation of motion shows that the solution is valid for high particle/fluid density ratios and to 0(1) in the Stokes number.
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Meslouhi, A., H. Amellal, Y. Hassouni, M. El Baz, and A. El Allati. "Quantum key distribution protocol using random bases." International Journal of Modern Physics B 30, no. 10 (April 20, 2016): 1650061. http://dx.doi.org/10.1142/s0217979216500612.

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In order to enhance the quantum key distribution (QKD) security, a new protocol, “QKDPRB” based on random bases is proposed. It consists of using standard encoding bases moving circularly with a variable rotational angle [Formula: see text] which depends on angular velocity [Formula: see text]; thus, the traditional bases turn into relative ones. To prove the security and the efficiency of the protocol, we present a universal demonstration which proves a high level security of the proposed protocol, even in the presence of the intercept and resend attack. Finally, the QKDPRB may improve the security of QKD.
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Krasnobaeva, L. A., and L. V. Yakushevich. "Rotational dynamics of bases in the gene coding interferon alpha 17 (IFNA17)." Journal of Bioinformatics and Computational Biology 13, no. 01 (February 2015): 1540002. http://dx.doi.org/10.1142/s0219720015400028.

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In the present work, rotational oscillations of nitrogenous bases in the DNA with the sequence of the gene coding interferon alpha 17 (IFNA17), are investigated. As a mathematical model simulating oscillations of the bases, we use a system of two coupled nonlinear partial differential equations that takes into account effects of dissipation, action of external fields and dependence of the equation coefficients on the sequence of bases. We apply the methods of the theory of oscillations to solve the equations in the linear approach and to construct the dispersive curves determining the dependence of the frequency of the plane waves (ω) on the wave vector (q). In the nonlinear case, the solutions in the form of kink are considered, and the main characteristics of the kink: the rest energy (E0), the rest mass (m0), the size (d) and sound velocity (C0), are calculated. With the help of the energetic method, the kink velocity (υ), the path (S), and the lifetime (τ) are also obtained.
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Cirillo, S., L. Simonetti, F. Di Salle, L. Stella, R. Elefante, and F. Smaltino. "La risonanza magnetica nell'emorragia subaracnoidea." Rivista di Neuroradiologia 2, no. 3 (October 1989): 219–25. http://dx.doi.org/10.1177/197140098900200304.

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La risonanza magnetica per immagine dell'emorragia subaracnoidea ha un ruolo ben definito nelle fasi subacute: l'efficacia della TC si riduce velocemente, mentre l'accuratezza diagnostica della RM aumenta per l'evidente accorciamento del T1 legato alla metemoglobina ed alla lisi cellulare. La velocity di produzione di metemoglobina e di lisi eritrocitaria sono in relazione con la riduzione della concentrazione locale di glucosio. Nel sistema subaracnoideo una molecola soluta può seguire i gradienti di concentrazione: la concentrazione di glucosio non può, perciò, abbassarsi velocemente, come nelle raccolte parenchimali. Comunque, anche se l'iperintensita in T1 è chiaramente dipendente dalla concentrazione, è possibile riconoscere un'emorragia subaracnoidea anche a basse concentrazioni sangue/liquor, come abbiamo riscontrato in 2 pazienti. Nelle fasi iperacute ed acute la sensibilità della RM è basata principalmente sulla riduzione del T2 causata dalla formazione di deossiemoglobina, mentre il segnale in T1 non subisce importanti modificazioni: la bassa velocity di riduzione della pressione parziale di ossigeno negli spazi subaracnoidei rende difficile distinguere miscele sangue-liquor dal liquor puro. Perciò la diagnosi RM di ESA può essere difficile, come abbiamo riscontrato in due pazienti, ma i coaguli possono offrire un utile ausilio semeiologico. Nelle fasi precoci il segnale dell'ESA è completamente modificato dai processi coagulativi, a causa di un chiaro accorgimento del T1, che diviene evidente durante la retrazione del coagulo. Questo carattere può essere considerato un utile marker in vivo di ESA acuta: è stato cosi possibile valutare una lieve iperintensità silviana in un'ESA acuta altrimenti negativa. D'altra parte bisogna considerare che la coagulazione di miscele sangue/liquor a influenzata da vari fattori biochimici, fisici e topografici, e quindi può presentare aspetti molto differenti e necessita di un esame accurato per essere dimostrata.
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Kobanov, N. I., and D. V. Makarchik. "Quasi-periodic line-of-sight velocity variations at the bases of polar coronal holes." Astronomy Reports 47, no. 11 (November 2003): 946–52. http://dx.doi.org/10.1134/1.1626197.

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Zhang, Raoyang, Ilya Staroselsky, and Hudong Chen. "Realization of isotropy of the lattice Boltzmann method via rotation of lattice velocity bases." Journal of Computational Physics 225, no. 2 (August 2007): 1262–70. http://dx.doi.org/10.1016/j.jcp.2007.01.032.

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Dissertations / Theses on the topic "Basse velocità"

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Davies, Luca. "Studio e realizzazione di un sistema di calibrazione per anemometri in galleria del vento." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/12914/.

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Il presente elaborato propone un metodo di calibrazione alle basse velocità degli anemometri a filo caldo utilizzati nella galleria del vento presente al C.I.C.Lo.P.E. (Center for International Cooperation in Long Pipe Experiments) dell'Università di Bologna, potenzialmente estendibile ad applicazioni più generali. In seguito ad un'analisi teorica approfondita della fattibilità di una calibrazione alle basse velocità, si è dimensionato e realizzato un prototipo in P.V.C. a geometria convergente-divergente, ritenuto in grado di produrre un flusso uniforme in uscita tale da garantire una soluzione al problema della calibrazione all'interno della test-section della galleria. Completata la fabbricazione del componente si è condotta un'analisi sperimentale, con l'ausilio del C.A.T. (Coaxial Air Tunnel) presente nell'hangar della Scuola di Ingegneria, sede di Forlì, del flusso generato internamente al divergente del calibratore. Nonostante si sia rilevata, mediante lo studio sperimentale condotto, una non perfetta uniformità del flusso uscente dal componente, i risultati riscontrati hanno permesso di inquadrare approcci e soluzioni atti ad un'ottimizzazione del calibratore, lasciando ampio margine di miglioramento ai fini della calibrazione alle basse velocità mediante il metodo descritto.
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Bastardi, Tommaso. "Valutazione della resistenza all’impatto di laminati compositi." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18572/.

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Nel presente lavoro di tesi è stato studiato il comportamento all’impatto di laminati compositi di varia natura, valutando il danneggiamento ad impatti a bassa velocità. Il comportamento dei diversi campioni è stato osservato prendendo come riferimento un laminato in fibra di carbonio e resina epossidica. Al fine di studiare e migliorare la risposta dei materiali a questo tipo di sollecitazioni sono stati utilizzati diversi approcci: introduzione di strati eterogenei di natura differente e uso di tessuti ibridi (fibre di carbonio e fibre polimeriche). I campioni sono stati quindi sottoposti ad impatti a diversa energia, con lo scopo di valutare l’energia assorbita e la loro deformazione. I provini danneggiati sono stati quindi sottoposti ad analisi di caratterizzazione microscopica, termica e meccanica.
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ARAUJO, EDVAL G. "Influencia das adicoes de NBC e ligas a base de fosforo na sinterizacao do aco rapido M2." reponame:Repositório Institucional do IPEN, 1993. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10372.

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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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Trousset, Emilie. "Prévision des dommages d'impact basse vitesse et basse énergie dans les composites à matrice organique stratifiés." Phd thesis, Paris, ENSAM, 2013. http://pastel.archives-ouvertes.fr/pastel-00942339.

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Afin de mieux comprendre et de mieux quantifier la formation des dommages d'impact et leurs conséquences sur la tenue de la structure composite, le recours à la simulation numérique semble être un complément indispensable pour enrichir les campagnes expérimentales. Cette thèse a pour objectif la mise au point d'un modèle d'impact pour la simulation numérique par éléments finis dynamique implicite, capable de prévoir les dommages induits.La première étape du travail a consisté à élaborer un modèle s'appuyant sur le modèle de comportement du pli " Onera Progressive Failure Model " (OPFM) et sur le modèle bilinéaire de zones cohésives proposé par Alfano et Crisfield, puis d'évaluer la sensibilité aux différentes composantes des lois de comportement de la réponse à un impact et des dommages prévus. Des essais d'impact et d'indentation sur des plaques stratifiées en carbone/époxy ont ensuite été réalisés, analysés et enfin confrontés aux résultats numériques, afin d'évaluer les performances à l'impact du modèle OPFM et ses limites.Ces travaux permettent d'aboutir à trois principales conclusions. Premièrement, l'usage de modèles de zones cohésives semble nécessaire pour prévoir la chute de force caractéristique de l'impact sur stratifiés. Deuxièmement, la prise en compte des contraintes hors plan, notamment les cisaillements, est indispensable pour prévoir correctement l'endommagement d'impact. Enfin, si le modèle OPFM est capable de prévoir qualitativement les dommages d'impact, l'absence de caractère adoucissant ou de viscoplasticité semble cependant limiter leur prévision quantitative.
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Siliotto, Matteo. "Valutazione analitica delle aree di delaminazione in materiali compositi avanzati soggetti ad impatti a bassa velocità." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/6005/.

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In questo lavoro di tesi è stato elaborato un modello analitico al fine di ottenere una stima dell’ampiezza di delaminazione a seguito di impatti a bassa velocità in laminati in composito, in particolare carbon/epoxy. Nel capitolo 2 è descritto il comportamento meccanico di tali laminati (equazioni costitutive della singola lamina, dell’intero laminato e costanti ingegneristiche dell’intero laminato per qualsiasi sistema di riferimento). Nel capitolo 3 viene descritta la filosofia di progettazione damage tolerance per tali materiali sottoposti a low-velocity impact (LVI) e richiamato il concetto di structural health monitoring. In particolare vengono descritti i tipi di difetti per un laminato in composito, vengono classificati gli impatti trasversali e si rivolge particolare attenzione agli impatti a bassa velocità. Nel paragrafo 3.4 sono invece elencate diverse tecniche di ispezione, distruttive e non, con particolare attenzione alla loro applicazione ai laminati in composito. Nel capitolo 4 è riportato lo stato dell’arte per la stima e la predizione dei danni dovuti a LVI nei laminati: vengono mostrate alcune tecniche che permettono di stimare accuratamente l’inizio del danno, la profondità dell’indentazione, la rottura delle fibre di rinforzo e la forza massima di impatto. L’estensione della delaminazione invece, è difficile da stimare a causa dei numerosi fattori che influenzano la risposta agli impatti: spesso vengono utilizzati, per tale stima, modelli numerici piuttosto dispendiosi in termini di tempo e di calcolo computazionale. Nel capitolo 5 viene quindi mostrata una prima formula analitica per il calcolo della delaminazione, risultata però inaffidabile perché tiene conto di un numero decisamente ristretto di fattori che influenzano il comportamento agli LVI. Nel capitolo 6 è mostrato un secondo metodo analitico in grado di calcolare l’ampiezza di delaminazione mediante un continuo aggiornamento della deflessione del laminato. Dal confronto con numerose prove sperimentali, sembra che il modello fornisca risultati vicini al comportamento reale. Il modello è inoltre fortemente sensibile al valore della G_IIc relativa alla resina, alle dimensioni del laminato e alle condizioni di vincolo. É invece poco sensibile alle variazioni delle costanti ingegneristiche e alla sequenza delle lamine che costituiscono il laminato. La differenza tra i risultati sperimentali e i risultati del modello analitico è influenzata da molteplici fattori, tra cui il più significativo sembra essere il valore della rigidezza flessionale, assunto costante dal modello.
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Reggi, Luca. "Validazione di un sistema GNSS-RTK multibanda a basso costo per la misura della velocità del cammino." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18716/.

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Nella pratica clinica la velocità del cammino è un parametro importante, largamente utilizzato sia come strumento predittivo di mortalità, disabilità e ulteriori avvenimenti avversi, sia singolarmente o all'interno di test motori per la misura oggettiva del cambiamento nello status dei pazienti, ad esempio prima e dopo una terapia. Le principali critiche alla misura della velocità all'interno degli ambienti clinici riguardano la mancanza di validità ecologica e le limitate distanze percorribili. Uno dei possibili strumenti utilizzabile per una valida e accurata misura di questo parametro anche in ambiente di vita reale, senza ad esempio vincoli su luogo e momento della misura o il bisogno di un continuo monitoraggio da parte di un esaminatore, è il GPS. L’impiego di questo dispositivo è stato fino ad ora limitato, per via delle basse prestazioni ottenibili in presenza di ostacoli come alti edifici o zone con una fitta vegetazione, migliorabili solo utilizzando dispositivi professionali dall'alto costo. Ad oggi invece questa spesa, con l’immissione sul mercato di moduli GNSS a basso costo capaci di misure differenziali RTK, è diminuita notevolmente rendendo questi ricevitori accessibili al consumatore medio. Lo scopo di questa tesi consiste, dunque, nella validazione della misura della velocità del cammino effettuata con uno di questi nuovi ricevitori, chiamato simpleRTK2B. Con questa finalità sono stati quindi stilati tre protocolli sperimentali che, utilizzando un cronometro e un sistema di fotocellule LED, consentissero la validazione della misura che simpleRTK2B fa della velocità media, sia in condizioni di utilizzo ottimale che in ambiente urbano.
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La, Ciacera Giorgio. "Caratterizzazione di un sistema GNSS-RTK multibanda a basso costo (simpleRTK2B) per la misura della velocità del cammino." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19547/.

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Nel Novembre 2018, la startup spagnola ArduSimple ha lanciato sul mercato simpeRTK2B, il primo dispositivo a basso costo, che permette di acquisire in real-time dati su posizione, velocità e altre informazioni, con accuratezza centimetrica, grazie all’utilizzo della tecnologia RTK. In questo lavoro ci si soffermerà sull’uso del simpleRTK2B per la misura della velocità del cammino. Lo scopo sarà caratterizzare il dispositivo, studiando il suo comportamento in varie situazioni d’uso, reali o simulate. Attraverso acquisizioni statiche si analizzerà l’accuratezza del dato dell’altitudine e l’influenza sui dati dovuta a variazioni dell’orientamento dell’antenna rispetto al cielo. Poi, con acquisizioni dinamiche, si cercherà di capire se l’accuratezza cambia al variare di: posizionamento dell’antenna; condizioni atmosferiche; distanza del ricevitore dalla stazione base che invia le correzioni RTK; presenza o meno di una barra metallica come base per l’antenna; orario d’acquisizione. Questo elaborato inizierà con l’introduzione dei concetti fondamentali sul sistema globale di navigazione satellitare; successivamente verrà descritto il dispositivo simpleRTK2B in tutte le sue parti, a cui seguiranno alcuni richiami sui metodi di statistica inferenziale successivamente utilizzati nell’analisi dei dati. Saranno poi presentati i protocolli utilizzati per le varie acquisizioni, le elaborazioni effettuate sui dati e le relative analisi, corredate da una presentazione sistematica dei principali risultati ottenuti.
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Morrison, Archie Todd. "Development of the BASS rake acoustic current sensor : measuring velocity in the continental shelf wave bottom boundary layer." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43470.

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Vial, Jérôme. "Etude expérimentale et numérique des modes de déformation d'un explosif comprimé." Phd thesis, Université d'Orléans, 2013. http://tel.archives-ouvertes.fr/tel-00965103.

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L'utilisation industrielle ou militaire des explosifs est largement répandue. La sécurité est devenue un axe majeur avec notamment l'ignition involontaire des explosifs composés de HMX lors des impacts à basse vitesse. L'objectif de cette thèse est de contribuer à la compréhension des mécanismes dissipatifs à l'origine des échauffements locaux dans le matériau. Le développement d'un essai aux barres d'Hopkinson a permis de coupler de grandes vitesses de déformations à des pressions élevées pour compléter les données expérimentales. Cet essai a montré un angle de frottement quasiment identique à celui obtenu en quasistatique mais une contrainte de cohésion supérieure d'environ 25 MPa. Ensuite, pour observer les mécanismes pouvant être sources d'échauffement, un essai de compression dans la tranche a été développé avec des observations en temps réel. Celles-ci ont permis de conclure qu'il y a très peu de frottements entre les gros grains et la matrice (l'ensemble des petits grains, du liant et de la porosité). De la plasticité des grains de HMX a pu être observée mais surtout beaucoup d'endommagement dans certaines zones y compris dans la matrice. Une microfissuration très intense de certains grains a été observée. Parallèlement, une représentation numérique biphasique (gros grains de HMX et matrice) de toute la microstructure du matériau a été considérée. Une confrontation entre les observations expérimentales et les simulations a permis de déterminer le seuil de plasticité du HMX. Le comportement de la matrice a été identifié pour prendre en compte l'effet de vitesse et l'endommagement observé. Enfin, les confrontations entre les essais et les simulations de ceux-ci ont montré que les échauffements devraient plutôt se localiser dans la matrice que dans les gros grains de HMX et que le mécanisme le plus probable est le frottement de lèvres de microfissures.
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Farkas, I., A. Aszodi, J. Elter, J. Klepac, J. Remis, S. Kliem, T. Höhne, T. Toppila, and I. Boros. "The European project FLOMIX-R: Description of the experimental and numerical studies of flow distribution in the reactor primary circuit(Final report on WP 3)." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-28628.

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The flow distribution in the primary circuit of the pressurized water reactor was studied with experiments and Computational Fluid Dynamics (CFD) simulations. The main focus was on the flow field and mixing in the downcomer of the pressure vessel: how the different factors like the orientation of operating loops, the total loop flow rate and the asymmetry of the loop flow rates affect the outcome. In addition to the flow field studies the overall applicability of CFD methods for primary circuit thermal-hydraulic analysis was evaluated based on the CFD simulations of the mixing experiments of the ROCOM (Rossendorf Coolant Mixing Model) test facility and the mixing experiments of the Paks NPP. The experimental part of the work in work package 3 included series of steady state mixing experiments with the ROCOM test facility and the publication of results of Paks VVER-440 NPP thermal mixing experiments. The ROCOM test facility models a 4-loop KONVOI type reactor. In the steady-state mixing experiments the velocity field in the downcomer was measured using laser Doppler anemometry and the concentration of the tracer solution fed from one loop was measured at the downcomer and at the core inlet plane. The varied parameters were the number and orientation of the operating loops, the total flow rate and the (asymmetric) flow rate of individual loops. The Paks NPP thermal mixing experiments took place during commissioning tests of replaced steam generator safety valves in 1987-1989. It was assumed that in the reactor vessels of Paks VVER-440 NPP equipped with six loops the mixing of the coolant is not ideal. For the realistic determination of the active core inlet temperature field for the transients and accidents associated with different level temperature asymmetry a set of mixing factors were determined. Based on data from the online core monitoring system and a separate mathematical model the mixing factors for loop flows at the core inlet were determined. In the numerical simulation part of the work package 3 the detailed measurements of ROCOM tests were used for the validation of CFD methods for primary circuit studies. The selected steady state mixing experiments were simulated with CFD codes CFX-4, CFX-5 and FLUENT. The velocity field in the downcomer and the mixing of the scalar were compared between CFD simulations and experiments. The CFD simulations of full scale PWR included the simulation of Paks VVER-440 mixing experiment and the simulation of Loviisa VVER-440 downcomer flow field. In the simulations of Paks experiments the experimental and simulated concentration field at the core inlet were compared and conclusions made concerning the results overall and the VVER-440 specific geometry modelling aspects like how to model the perforated elliptic bottom plate and what is the effect of the cold leg bends to the flow field entering to the downcomer. With Loviisa simulations the qualitative comparison was made against the original commissioning experiments but the emphasis was on the CFD method validation and testing. The overall conclusion concerning the CFD modelling of the flow field and mixing in the PWR primary circuit could be that the current computation capacity and physical models also in commercial codes is beginning to be sufficient for simulations giving reliable and useful results for many real primary circuit applications. However the misuse of CFD methods is easy, and the general as well as the nuclear power specific modelling guidelines should be followed when the CFD simulations are made.
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Books on the topic "Basse velocità"

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Nigro, Giampiero, ed. I prezzi delle cose / The Prices of Things. Florence: Firenze University Press, 2017. http://dx.doi.org/10.36253/978-88-6453-492-3.

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La dinamica dei prezzi è uno degli argomenti classici della storia economica. L’attenzione per questo tema fu particolarmente viva a partire dagli anni Trenta del Novecento, in tutti i paesi europei. I materiali raccolti e pubblicati a quell’epoca continuano a costituire una base documentaria importante per ogni ricerca sull’andamento economico delle economie pre-industriali. L’interesse per i prezzi si ridusse dagli anni Settanta agli anni Novanta. È ripreso, tuttavia, negli ultimi quindici-venti anni come conseguenza della rinnovata attenzione per il tema della crescita e per i cambiamenti di lungo periodo nelle economie del passato. Il confronto fra i livelli di sviluppo di economie diverse, come quella europea e quella asiatica, insieme con l’uso di strumenti statistici più avanzati nel campo della storia economica, ha rafforzato l’interesse per i prezzi. I contributi presenti in questo volume si articolano intorno a due macro-temi: La formazione dei prezzi nelle economie e società pre-industriali durante i secoli dal XII all’inizio del XIX e il movimento dei prezzi nel lungo periodo, nonché il rapporto esistente con quello di altre variabili economiche e non-economiche, quali la popolazione, la massa monetaria, il prodotto, la produttività, la velocità di circolazione della moneta, i cambiamenti nelle istituzioni.
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Lewis Research Center. Institute for Computational Mechanics in Propulsion., ed. On the behavior of three-dimensional wave packets in viscously spreading mixing layers. Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, Institute for Computational Mechanics in Propulsion, 1994.

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Lewis Research Center. Institute for Computational Mechanics in Propulsion., ed. On the behavior of three-dimensional wave packets in viscously spreading mixing layers. Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, Institute for Computational Mechanics in Propulsion, 1994.

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Lewis Research Center. Institute for Computational Mechanics in Propulsion., ed. On the behavior of three-dimensional wave packets in viscously spreading mixing layers. Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, Institute for Computational Mechanics in Propulsion, 1994.

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Lewis Research Center. Institute for Computational Mechanics in Propulsion, ed. On the behavior of three-dimensional wave packets in viscously spreading mixing layers. Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, Institute for Computational Mechanics in Propulsion, 1994.

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N, Dalton William, and NASA Glenn Research Center, eds. Lobed mixer design for noise suppression: Acoustic and aerodynamic test data analysis. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2002.

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Book chapters on the topic "Basse velocità"

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Koizumi, Takayuki, Nobutaka Tsujiuchi, and Ryota Akatsuka. "Construction of DEM-base Traffic Model Using Optimal Velocity Model." In Linking Models and Experiments, Volume 2, 231–36. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9305-2_16.

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Sidorin, I., and Michael Gurnis. "Geodynamically consistent seismic velocity predictions at the base of the mantle." In The Core‐Mantle Boundary Region, 209–30. Washington, D. C.: American Geophysical Union, 1998. http://dx.doi.org/10.1029/gd028p0209.

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Oetomo, Denny, Marcelo H. Ang, Rodrigo Jamisola, and Oussama Khatib. "Integration of Torque Controlled Arm with Velocity Controlled Base for Mobile Manipulation." In Romansy 14, 189–99. Vienna: Springer Vienna, 2002. http://dx.doi.org/10.1007/978-3-7091-2552-6_22.

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Rybus, Tomasz, Tomasz Barciński, Jakub Lisowski, and Karol Seweryn. "Analyses of a Free-Floating Manipulator Control Scheme Based on the Fixed-Base Jacobian with Spacecraft Velocity Feedback." In Aerospace Robotics II, 59–69. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13853-4_6.

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Chen, Jiaxin, Fredrik Lindberg, Lyubov Belova, Björn Forssgren, Karen Gott, Johan Lejon, and Audrius Jasiulevicius. "High Resolution Electron Microscopy Study on Oxide Films Formed on Nickel-Base Alloys X-750, 182 and 82 in Simulated High Flow Velocity BWR Water Conditions." In 15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors, 371–83. Hoboken, New Jersey, Canada: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118456835.ch36.

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Chen, Jiaxin, Fredrik Lindberg, Lyubov Belova, Björn Forssgren, Karen Gott, Johan Lejon, and Audrius Jasiulevicius. "High Resolution Electron Microscopy Study on Oxide Films Formed on Nickel-Base Alloys X-750, 182 and 82 in Simulated High Flow Velocity BWR Water Conditions." In Proceedings of the 15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems — Water Reactors, 371–88. Cham: Springer International Publishing, 2011. http://dx.doi.org/10.1007/978-3-319-48760-1_22.

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Casteletti, L. C., A. Lombardi Neto, D. T. de Macedo, L. B. Cruvinel, and George Totten. "Stellite Superalloy Powder Deposition on 7075 Aluminum Alloy." In Encyclopedia of Aluminum and Its Alloys. Boca Raton: CRC Press, 2019. http://dx.doi.org/10.1201/9781351045636-140000303.

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Several types of powders can be deposited on metal alloys for property improvement using thermal spray processes. Aircraft grade 7075 aluminum alloy possesses good mechanical properties but poor wear and corrosion resistance. Thermal spray coatings can improve the poor wear performance of 7075 so that it is suitable for use in severe conditions by depositing a hard, wear-resisting layer over the base material. This can be done by a simple production process while maintaining the base material properties. Among the available coatings, cobalt-base superalloys, such as Stellites, provides excellent protection against corrosion and wear. However, the treatment must not deteriorate the substrate hardness. In the High Velocity Oxygen Fuel (HVOF) thermal spray process, the short resident time of the powder in the flame results in a relatively small temperature increase, which in turn results in a lower substrate temperature during the coating deposition. In the present work, HVOF thermal spray process was used to coat 7075-T3 aluminum alloy samples with Stellite 6 superalloy. This treatment resulted in layers of high hardness and improved wear performance while keeping the base material properties unchanged.
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Wang, Qiang, and Hai-Lin Liu. "Optimized Base Station Sleeping and Smart Grid Energy Procurement Scheme to Improve Energy Efficiency." In Critical Developments and Applications of Swarm Intelligence, 357–78. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-5134-8.ch014.

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In this chapter, the authors propose a joint BS sleeping strategy, resource allocation, and energy procurement scheme to maximize the profit of the network operators and minimize the carbon emission. Then, a joint optimization problem is formulated, which is a mixed-integer programming problem. To solve it, they adopt the bi-velocity discrete particle swarm optimization (BVDPSO) algorithm to optimize the BS sleeping strategy. When the BS sleeping strategy is fixed, the authors propose an optimal algorithm based on Lagrange dual domain method to optimize the power allocation, subcarrier assignment, and energy procurement. Numerical results illustrate the effectiveness of the proposed scheme and algorithm.
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Wang, Qiang, and Hai-Lin Liu. "Optimized Base Station Sleeping and Renewable Energy Procurement Scheme Using PSO." In Sustainable Infrastructure, 65–85. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-0948-7.ch004.

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Energy efficiency of the wireless networks has drawn more and more attentions due to the requirement of the green communication. The base station sleeping strategy and resource allocation can effectively improve the energy efficiency for the wireless networks. Meanwhile, renewable energy is important to decrease the carbon emission. In this paper, the authors propose a joint BS sleeping strategy, resource allocation and renewable energy procurement scheme to maximize the profit of the network operators and minimize the carbon emission. Then, a joint optimization problem is formulated, which is a mixed integer programming problem. To solve it, they adopt the bi-velocity discrete particle swarm optimization (BVDPSO) algorithm to optimize the BS sleeping strategy. When the BS sleeping strategy is fixed, the authors propose an optimal algorithm based on Lagrange dual domain method to optimize the power allocation, subcarrier assignment and energy procurement. Numerical results illustrate the effectiveness of their proposed scheme and algorithm.
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Gupta, Meenu, and Neha Singla. "Evolution of Cloud in Big Data With Hadoop on Docker Platform." In Privacy and Security Policies in Big Data, 41–62. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-2486-1.ch003.

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Data can be anything but from a large data base extraction of useful information is known as data mining. Cloud computing is a term which represent a collection of huge amount of data. Cloud computing can be correlated with data mining and Big Data Hadoop. Big data is high volume, high velocity, and/or high variety information asset that require new form of processing to enable enhanced decision making, insight discovery and process optimization. Data growth, speed and complexity are being accompanied by deployment of smart sensors and devices that transmit data commonly called the Internet of Things, multimedia and by other sources of semi-structured and structured data. Big Data is defined as the core element of nearly every digital transformation today.
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Conference papers on the topic "Basse velocità"

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Quashnock, Jean M. "Likelihood analysis of repeating in the BATSE catalogue." In High velocity neutron stars and gamma−ray bursts. AIP, 1996. http://dx.doi.org/10.1063/1.50247.

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Briggs, Michael S., Geoffrey N. Pendleton, William S. Paciesas, Jon Hakkila, Dieter Hartmann, Chryssa Kouveliotou, Charles A. Meegan, and Gerald J. Fishman. "GRB moments: HVNS models compared with BATSE observations." In High velocity neutron stars and gamma−ray bursts. AIP, 1996. http://dx.doi.org/10.1063/1.50253.

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Li, Hui, and Rob Duncan. "Beamed gamma-ray bursts from the galactic halo: Model comparisons with the second BATSE catalog." In High velocity neutron stars and gamma−ray bursts. AIP, 1996. http://dx.doi.org/10.1063/1.50254.

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Barnard, Zachary R., Anne K. Maxwell, Tommy J. Muelleman, William H. Slattery, Guatam U. Mehta, and Gregory P. Lekovic. "Intraoperative Evaluation of Sigmoid Sinus Velocity in Translabyrinthine Craniotomies for Vestibular Schwannomas using Doppler Ultrasound." In 30th Annual Meeting North American Skull Base Society. Georg Thieme Verlag KG, 2020. http://dx.doi.org/10.1055/s-0040-1702598.

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Tiemin, Wen, Dai Xiaoyun, Luo Xiaoxia, Huang Lijuan, and Wang Qin. "Volcanic velocity modeling method base on geology model." In International Geophysical Conference, Beijing, China, 24-27 April 2018. Society of Exploration Geophysicists and Chinese Petroleum Society, 2018. http://dx.doi.org/10.1190/igc2018-077.

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Boswell, B., and J. Dutton. "Velocity measurements in a three-dimensional compressible base flow." In 40th AIAA Aerospace Sciences Meeting & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-292.

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Khanduri, Gagan, and Brishbhan Panwar. "Base doping profile optimization including carriers velocity saturation effect." In Proceedings 2007 IEEE SoutheastCon. IEEE, 2007. http://dx.doi.org/10.1109/secon.2007.342968.

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Gray, William W., John Rock, and James Desler. "Creation of a velocity data base offshore Gulf of Mexico." In SEG Technical Program Expanded Abstracts 1989. Society of Exploration Geophysicists, 1989. http://dx.doi.org/10.1190/1.1889796.

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Pozo, Francesc, Leonardo Acho, Jose Rodellar, and Josep Maria Rossell. "A velocity-based seismic control for base-isolated building structures." In 2009 American Control Conference. IEEE, 2009. http://dx.doi.org/10.1109/acc.2009.5160130.

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Shijun, Huang, and Huang Yao. "A study of fish velocity measurement base on video tracking." In 2012 2nd International Conference on Computer Science and Network Technology (ICCSNT). IEEE, 2012. http://dx.doi.org/10.1109/iccsnt.2012.6526290.

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Reports on the topic "Basse velocità"

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Anderson, Richard G., and Robert H. Rasche. The Remarkable Stability of Monetary Base Velocity in the United States,1919-1999. Federal Reserve Bank of St. Louis, 2001. http://dx.doi.org/10.20955/wp.2001.008.

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Huang, Dong, Stephen E. Schwartz, and Dantong Yu. Determination of Cloud Base Height, Wind Velocity, and Short-Range Cloud Structure Using Multiple Sky Imagers Field Campaign Report. Office of Scientific and Technical Information (OSTI), July 2016. http://dx.doi.org/10.2172/1294258.

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Deeds, Jake, and John Bradford. CHARACTERIZATION OF AN AQUITARD AND DIRECT DETECTION OF LNAPL AT HILL AIR FORCE BASE USING GPR AVO AND MIGRATION VELOCITY ANALYSES. Office of Scientific and Technical Information (OSTI), June 2002. http://dx.doi.org/10.2172/833500.

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McAlpin, Jennifer, and Cassandra Ross. Houston Ship Channel Expansion Channel Improvement Project (ECIP) numerical modeling report : BABUS cell and Bird Island analysis. Engineer Research and Development Center (U.S.), August 2021. http://dx.doi.org/10.21079/11681/41581.

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The Houston Ship Channel (HSC) is one of the busiest deep-draft navigation channels in the United States and must be able to accommodate increasing vessel sizes. The US Army Engineer District, Galveston (SWG), requested the Engineer Research and Development Center, Coastal and Hydraulics Laboratory, perform hydrodynamic and sediment modeling of proposed modifications in Galveston and Trinity Bays and along the HSC. The modeling results are necessary to provide data for hydrodynamic, salinity, and sediment transport analysis. SWG provided three project alternatives that include closing Rollover Pass, Bay Aquatic Beneficial Use System cells, Bird Islands, and HSC modifications. These alternatives and a Base (existing condition) will be simulated for present (2029) and future (2079) conditions. The results of these alternatives/conditions as compared to the Base are presented in this report. The model shows that the mean salinity varies by 2–3 ppt due to the HSC channel modifications and by approximately 5 ppt in the area of East Bay due to the closure of Rollover Pass. The tidal prism increases by 2.5% to 5% in the alternatives. The tidal amplitudes change by less than 0.01 m. The residual velocity vectors vary in and around areas where project modifications are made.
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