130 research outputs found
Admissibility and Non-Uniform Dichotomy for Differential Systems
No full textThe problem of nonuniform exponential dichotomy of linear differential
systems in Banach spaces is discussed. It is established a connection
between the admissibility of a pair of certain function spaces which are translations
invariant, on one hand, and the nonuniform exponential dichotomy
of differential systems, on the other. Also, Some results due to Hartman,
Massera, Schäffer and Coppel are generalized as well
BOOK REVIEW: CIPRIAN PORUMBESCU NECUNOSCUT (CIPRIAN PORUMBESCU UNKNOWN), PUBLISHING BY ED. LIDANA, SUCEAVA, 3 EDIŢII, 2011-2013 (ISSN: 2284-712X)
No full textIn late May and early June of this year, organized by the Bucovina Cultural Center from Suceava, took place the third edition (2013) of the “Ciprian Porumbescu” European Festival of Arts, having among the guests of honour the Porumbescu’s family descendant, Mrs. Nina Cionca, author of a vast, detailed and richly illustrated monograph about Ciprian Porumbescu. Among a series of notable cultural representations made to celebrate 160 years of the birth of Bucovinean composer Ciprian Porumbescu, in June 1st at Stupca (today: Ciprian Porumbescu), at the Ciprian Porumbescu Memorial Museum, also held at the National Musicological Symposium. Within it have been presented the following papers dedicated to the composer\u27s life and activity: Leca Morariu and the Monumental Monograph Worshiped to Ciprian Porumbescu (author: Vasile Vasile – from the University of Piteşti); The Architectural and Tonal Support of the Dramaturgy of the “Crai nou” (New Philanderer) Operetta by Ciprian Porumbescu (author: Gabriela Coca – from the Babeş-Bolyai University of Cluj-Napoca); “Balada” (The Ballad) of Ciprian Porumbescu – a Representative Creation of the Art Music of Bucovina (19th century) (author: Zamfira Dănilă – from the “George Enescu” Academy of Art - Iaşi); The Reception of Ciprian Porumbescu’s Creation in Banat (author: Constantin Tufan Stan – from the Filaret Barbu School of Fine Arts of Lugoj); „Altarul Mănăstirii Putna” (The Altar of Putna Monastery) (author: Sever Paraschiv Dumitrache – from the Bucovina Cultural Center of Suceava); and The Musicological Trilogy “Ciprian Porumbescu Unknown” to an end (autor: Constanţa Cristescu – from the Bucovina Cultural Center - Suceava). These papers are all included, in this presented volume, with other two studies: Ciprian Porumbescu – Friends and his Collaborators of Braşov (author: the regretted musicologist professor Constantin Catrina from the Transylvania University of Braşov) and The Aspects of the Musical Language and of its Architecture in Compositions by Ciprian Porumbescu (author: Ozana Kalmuski-Zarea – from the “Mihail Jora” Philharmonic of Bacău). In a special chapter, entitled Documenta, this volume contains the facsimile of the manuscript of the orchestra score of the vocal-symphonic work The Altar of Putna Monastery by Ciprian Porumbescu
The Perron Problem for C-Semigroups
No full text<p>Characterizations of Perron-type for the exponential stability of exponentially bounded C-semigroups are given. Also, some applications for the asymptotic behavior of the integrated semigroups are obtained.</p></p
BOOK REVIEW: CIPRIAN PORUMBESCU NECUNOSCUT (CIPRIAN PORUMBESCU UNKNOWN), PUBLISHING BY ED. LIDANA, SUCEAVA, 3 EDIŢII, 2011-2013 (ISSN: 2284-712X)
No full textIn late May and early June of this year, organized by the Bucovina Cultural Center from Suceava, took place the third edition (2013) of the “Ciprian Porumbescu” European Festival of Arts, having among the guests of honour the Porumbescu’s family descendant, Mrs. Nina Cionca, author of a vast, detailed and richly illustrated monograph about Ciprian Porumbescu. Among a series of notable cultural representations made to celebrate 160 years of the birth of Bucovinean composer Ciprian Porumbescu, in June 1st at Stupca (today: Ciprian Porumbescu), at the Ciprian Porumbescu Memorial Museum, also held at the National Musicological Symposium. Within it have been presented the following papers dedicated to the composer's life and activity: Leca Morariu and the Monumental Monograph Worshiped to Ciprian Porumbescu (author: Vasile Vasile – from the University of Piteşti); The Architectural and Tonal Support of the Dramaturgy of the “Crai nou” (New Philanderer) Operetta by Ciprian Porumbescu (author: Gabriela Coca – from the Babeş-Bolyai University of Cluj-Napoca); “Balada” (The Ballad) of Ciprian Porumbescu – a Representative Creation of the Art Music of Bucovina (19th century) (author: Zamfira Dănilă – from the “George Enescu” Academy of Art - Iaşi); The Reception of Ciprian Porumbescu’s Creation in Banat (author: Constantin Tufan Stan – from the Filaret Barbu School of Fine Arts of Lugoj); „Altarul Mănăstirii Putna” (The Altar of Putna Monastery) (author: Sever Paraschiv Dumitrache – from the Bucovina Cultural Center of Suceava); and The Musicological Trilogy “Ciprian Porumbescu Unknown” to an end (autor: Constanţa Cristescu – from the Bucovina Cultural Center - Suceava). These papers are all included, in this presented volume, with other two studies: Ciprian Porumbescu – Friends and his Collaborators of Braşov (author: the regretted musicologist professor Constantin Catrina from the Transylvania University of Braşov) and The Aspects of the Musical Language and of its Architecture in Compositions by Ciprian Porumbescu (author: Ozana Kalmuski-Zarea – from the “Mihail Jora” Philharmonic of Bacău). In a special chapter, entitled Documenta, this volume contains the facsimile of the manuscript of the orchestra score of the vocal-symphonic work The Altar of Putna Monastery by Ciprian Porumbescu
A version of a theorem of R. Datko for nonuniform exponential contractions
No full textAbstractWe point out versions of a well-known theorem of R. Datko for nonuniform exponential contractions. More precisely, we obtain theorems that characterize the nonuniform exponential stability and the nonuniform exponential dichotomy for nonuniform exponential contractions. Thus, we generalize the results in Datko (1972) [8] and Preda and Megan (1985) [14]
Closing remarks and outlook to EOSC 2019: EOSC Launch Event
No full textClosing remarks and outlook to EOSC 2019
Jean-Eric Paquet, Director-General – Directorate „Research and Innovation“ (RTD)
Ciprian Preda, Secretary of State, Romani
Ciprian Pripoae-Șerbănescu, Subconștient, comunicare, sens (Subconscious, communication, meaning), TopForm, Bucharest, 2018, 95 p.
No full textThe volume Subconscious, communication, meaning, published in 2018, by TopForm Publishing House, within the Psychology collection, represents a real contribution in the field of intelligence studies. The author Ciprian Pripoae-Șerbănescu successfully summarizes the concerns in the field of psychology, critical thinking and intelligence, with an emphasis on the persuasive role of communication. After all, the paper can be a starting point for future research, especially due to the interdisciplinary perspective
Declaration on the European Open Science Cloud: EOSC Launch Event
No full textDeclaration on the European Open Science Cloud
European Commission:
Jean-Eric PAQUET Director-General – Directorate "Research and Innovation" (RTD)
Former Presidency:
Karina Angelieva, Deputy Minister of Education and Science, Bulgaria
Incoming Presidency:
Ciprian Preda, Secretary of State, Romania
Austrian Presidency:
Heinz Faßmann, Minister, Austrian Federal Ministry of Education, Science and Researc
Enabling dynamic interactions in large scale applications and scientific workflows using semantically specialized shared DataSpaces
No full textEmerging scientific and engineering applications use large-scale parallel machines to simulate, with higher accuracy, complex physical phenomena consisting of dynamically interacting processes. The workflows associated with these applications consist of parallel application codes that need to co- ordinate and interact at runtime. The interactions typically involve large volumes of data that must be exchanged and processed by the codes. The heterogeneous nature of the coupled codes, their numerical formulations, and their data decompositions lead to complex and dynamic interaction and data exchange patterns that are only defined at runtime. Moreover, these simulations often run on separate resources and progress at different rates, which adds to their complexity. Efficient and scalable implementation of these coupled application workflows present several challenging programming, orchestration, coordination, and data exchange requirements. Existing programming frameworks, however, are rigid and provide limited support for the dynamic inter- actions manifested by these applications. For example, existing frameworks need to gather global application knowledge, impose tight synchronization between applications, or demand pre-defined and static interaction patterns that must be known prior to execution. These constraints can introduce significant performance penalties and can limit application interaction programming expressiveness. This thesis explores a new communication and coordination model to enable flexible and asynchronous application coupling for coupled applications workflows. It derives from the tuple-space model and provides the abstraction of a virtual distributed shared-space, which is customized for the application data domain. It enables applications to coordinate and exchange data by inserting and retrieving data objects. This model does not impose any synchronization requirements between independent applications. Data stored on the space can be accessed by multiple applications, which can associatively query the space and retrieve data objects. Furthermore, it enables decoupled and dynamic interactions driven by application computations. This thesis presents DataSpaces, a prototype implementation of the distributed shared-space model. DataSpaces enables memory-to-memory application coupling and transparent data redistribution. It can complement existing workflow engines to enable in-memory data transports between distributed applications that run on separate resources as part of end-to-end scientific workflows. The thesis also presents ActiveSpaces, which extends DataSpaces and the shared-space model to enable in-transit data processing. It proposes and demonstrates a shift in the data processing paradigm by moving processing code closer to the data. ActiveSpaces provides programming support for defining data processing routines, and a runtime execution system to deploy and remotely execute these routine on the space. The research concepts and software frameworks have been deployed and evaluated using real application workflows in production runs on high-end computing systems.Ph. D.Includes bibliographical referencesIncludes vitaby Ciprian Doca
Asynchronous data transfers on large scale HPC systems with experiments on the CRAY XT3/XT4
No full textA key challenge faced by the emerging large scale scientific and engineering simulations is effectively and efficiently managing the large volumes of heterogeneous data generated. This includes offloading this data from the compute nodes at runtime, and transferring it over to service nodes or remote clusters for online
monitoring, analysis, or archiving. To be effective, these I/O operations should not impose additional synchronization penalties on
the simulation, should have minimal impact on the computational performance, maintain overall Quality of Service, and ensure that no data is lost.
This thesis describes the design, implementation, and operation of DART (Decoupled Asynchronous Remote Transfers). DART is a thin software layer built on RDMA (Remote Direct Memory Access) communication technology, and specifically the Portals RDMA library to allow fast, low-overhead access to data from simulations running on compute elements, and to support high-throughput low latency
asynchronous I/O transfer of this data.
DART is part of the infrastructure for an integrated simulation of fusion plasma in a Tokamak being developed at the Center for Plasma Edge Simulation (CPES), a DoE Office of Fusion Energy Science (OFES) Fusion Simulation Projects (FSP). A performance evaluation on the Cray XT3/XT4 system at Oak Ridge National Laboratory demonstrates that DART can be used to offload expensive I/O operations to dedicated service nodes allowing more efficient utilization of the compute elements.M.S.Includes bibliographical references (p. 41-42)
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