1,833 research outputs found
Central pseudoscalar production in pp scattering and the gluon contribution to the proton spin
Central pseudoscalar production in scattering is suppressed at small
values of , where is defined as the difference between the momenta
transferred from the two protons. Such a behaviour is expected if the
production occurs through the fusion of two vectors. Photon exchange could
provide the dominant contribution at low transferred momenta, but we argue that
an extension of the experiment could probe the gluon contribution to the proton
spin.Comment: 12 pages, 2 figures and 3 tables, uses epsf.sty. Added references and
tables. Minor changes include
Giovanni Pascoli: Un focolare per lâèra nuova
A booklet, published in 1899 but symbolically dated 1900, clarifies the extent to which Pascoli believed himself to be Leopardiâs poetic successor. For Pascoli, the main responsibility of poets of the ânew eraâ was to imbue mankind with a sentiment of fraternity, being the only possible reaction to the scientific recognition of lifeâs emptiness. The new poetry would enable man to evolve from the incomplete status of homo sapiens to that of homo humanus. This is the value of the poem Il focolare, in which the illusory comfort of an empty hearth represents the only possible consolation for all men
Intent-based network slicing for SDN vertical services with assurance: Context, design and preliminary experiments
Network slicing is announced to be one of the key features for 5G infrastructures enabling network operators to provide network services with the flexibility and dynamicity necessary for the vertical services, while relying on Network Function Virtualization (NFV) and Software-defined Networking (SDN). On the other hand, vertical industries are attracted by flexibility and customization offered by operators through network slicing, especially if slices come with in-built SDN capabilities to programmatically connect their application components and if they are relieved of dealing with detailed technicalities of the underlying (virtual) infrastructure. In this paper, we present an Intent-based deployment of a NFV orchestration stack that allows for the setup of Qos-aware and SDN-enabled network slices toward effective service chaining in the vertical domain. The main aim of the work is to simplify and automate the deployment of tenant-managed SDN-enabled network slices through a declarative approach while abstracting the underlying implementation details and unburdening verticals to deal with technology-specific low-level networking directives. In our approach, the intent-based framework we propose is based on an ETSI NFV MANO platform and is assessed through a set of experimental results demonstrating its feasibility and effectiveness
Intent-based zero-touch service chaining layer for software-defined edge cloud networks
Edge Computing, along with Software Defined Networking and Network Function Virtualization, are causing network infrastructures to become as distributed clouds extended to the edge with services provided as dynamically established sequences of virtualized functions (i.e., dynamic service chains) thereby elastically addressing different processing requirements of application data flows. However, service operators and application developers are not inclined to deal with descriptive configuration directives to establish and operate services, especially in case of service chains. Intent-based Networking is emerging as a novel approach that simplifies network management and automates the implementation of network operations required by applications. This paper presents an intent-based zero-touch service chaining layer that provides the programmable provision of service chain paths in edge cloud networks. In addition to the dynamic and elastic deployment of data delivery services, the intent-based layer offers an automated adaptation of the service chains paths according to the application's goals expressed in the intent to recover from sudden congestion events in the SDN network. Experiments have been carried out in an emulated network environment to show the feasibility of the approach and to evaluate the performance of the intent layer in terms of network resource usage and adaptation overhead
Thermal Performance of the Supporting System for the Large Hadron Collider (LHC) Superconducting Magnets
The LHC collider will be composed of approximately 1700 main ring superconducting magnets cooled to 1.9 K in pressurised superfluid helium and supported within their cryostats on low heat in-leak column-type supports. The precise positioning of the heavy magnets and the stringent thermal budgets imposed by the machine cryogenic system, require a sound thermo-mechanical design of the support system. Each support is composed of a main tubular thin-walled structure in glass-fibre reinforced epoxy resin, with its top part interfaced to the magnet at 1.9 K and its bottom part mounted onto the cryostat vacuum vessel at 293 K. In order to reduce the conduction heat in-leak at 1.9 K, each support mounts two heat intercepts at intermediate locations on the column, both actively cooled by cryogenic lines carrying helium gas at 4.5-10 K and 50-65 K. The need to assess the thermal performance of the supports has lead to setting up a dedicated test set-up for precision heat load measurements on prototype supports. This paper presents the thermal design of the support system of the LHC arc magnets. The results of the thermal tests of a prototype support made in industry are illustrated and discussed. A mathematical model has been set up and refined by the comparison with test results, with the scope of extrapolating the observed thermal performance to different geometrical and material parameters. Finally, the calculated estimate of the heat load budgets of the support system and their contribution to the total cryogenic budget for an LHC arc are presented
The GRAAL high resolution BGO calorimeter and its energy calibration and monitoring system
We describe the electromagnetic calorimeter built for the GRAAL apparatus at
the ESRF. Its monitoring system is presented in detail. Results from tests and
the performance obtained during the first GRAAL experiments are given. The
energy calibration accuracy and stability reached is a small fraction of the
intrinsic detector resolution.Comment: 19 pages, 14 figures, submitted to Nuclear Instruments and Method
Phenomenological evidence for the energy dependence of the mixing angle
A phenomenological analysis on various decay processes is performed using an
energy-dependent mixing angle scheme. Special attention is given
to the radiative couplings between lowest-lying vector and pseudoscalar mesons.
The agreement between our predictions and the experimental values is
remarkable. This analysis opens a connection to two-angle fits in the
sector.Comment: 13 pages. Introduction slightly modified. A second Table added.
Conclusions remain unchange
Vere da cisterna con gorgoneia da Gela
Partendo dall''analisi di due tipi di antefisse gorgoniche dell''antica Gela, dai caratteri fortemente umanizzati e databili nel secondo quarto del V sec. a.C., si allarga il discorso alle vere da pozzo che presentano, come elemento decorativo, la stessa maschera gorgonica. La datazione di queste ultime, sulla base di una nuova revisione dei contesti e dei caratteri stilistici dei gorgoneia, viene rialzata al V secolo a.C
Resource orchestration strategies with retrials for latency-sensitive network slicing over distributed telco clouds
The new radio technologies (i.e. 5G and beyond) will allow a new generation of innovative services operated by vertical industries (e.g. robotic cloud, autonomous vehicles, etc.) with more stringent QoS requirements, especially in terms of end-to-end latency. Other technological changes, such as Network Function Virtualization (NFV) and Software-Defined Networking (SDN), will bring unique service capabilities to networks by enabling flexible network slicing that can be tailored to the needs of vertical services. However, effective orchestration strategies need to be put in place to offer latency minimization while also maximizing resource utilization for telco providers to address vertical requirements and increase their revenue. Looking at this objective, this paper addresses a latency-sensitive orchestration problem by proposing different strategies for the coordinated selection of virtual resources (network, computational, and storage resources) in distributed DCs while meeting vertical requirements (e.g., bandwidth demand) for network slicing. Three orchestration strategies are presented to minimize latency or the blocking probability through effective resource utilization. To further reduce the slice request blocking, orchestration strategies also encompass a retrial mechanism applied to rejected slice requests. Regarding latency, two components were considered, namely processing and network latency. An extensive set of simulations was carried out over a wide and composite telco cloud infrastructure in which different types of data centers coexist characterized by a different network location, size, and processing capacity. The results compare the behavior of the strategies in addressing latency minimization and service request fulfillment, also considering the impact of the retrial mechanism.This work was supported in part by the Department of Excellence in Robotics and Artificial Intelligence by Ministero dellâIstruzione, dellâUniversitĂ e della Ricerca (MIUR) to Scuola Superiore SantâAnna, and in part by the Project 5GROWTH under Agreement 856709
Oltre la chora : nuove indagini archeologiche nell'entroterra di Metaponto
Presentazione del progetto "Oltre la chora", programma di indagini sistematiche nel territorio posto alle spalle della chora di Metaponto. L''area indagata attraverso ricognizioni archeologiche, tra i moderni paesi di Pisticci e Ferrandina, ha restituito una serie di siti e di strutture produttive che evidenziano una intensa frequentazione della zona, soprattuto tra IV e III secolo a.C
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