536 research outputs found
Similarity rules and parametric design of race engines
No full textThe paper shows results fom the comparison between V10 and V12 engines for racing applications. Results are derived from a combination of experimental data and 1d simulations
"Comparison of V10 and V12 F1 Engines"
No full textThe paper compares 3.0 liter F1 engines having different architectures and developed in compliance with the 1998 FIA technical regulations. Similarity rules and non dimensional parameters from previous projects define key geometry and operating parameters for V10 and V12 engines having equal degree of sophistication. The paper presents computed classical engine outputs versus engine speed, including brake, indicated and friction values. The V12 solution shows clear advantages in terms of pure engine performances
L'informazione a portata di mano: biblioteche, tecnologie e servizi agli utenti. Atti del XXXVII Congresso nazionale dell'Associazione italiana biblioteche
No full textCorrigendum to “Micro-manipulation of Nanodiamonds containing NV Centres for quantum applications” [Diam. Relat. Mater. 106 (June 2020) 107840] (Diamond & Related Materials (2020) 106, (S0925963520301400), (10.1016/j.diamond.2020.107840))
No full textThe authors regret . The authors would like to apologise for any inconvenience caused
Decidability for Priorean Linear Time Using a Fixed-Point Labelled Calculus
No full textA labelled sequent calculus is proposed for Priorean linear time logic, the rules of which reflect a natural closure algorithm derived from the fixed-point properties of the temporal operators. All the rules of the system are finitary, but proofs may contain infinite branches. Soundness and completeness of the calculus are stated with respect to a notion of provability based on a condition on derivation trees: A sequent is provable if and only if no branch leads to a ‘fulfilling sequent,’ the syntactical counterpart of a countermodel for an invalid sequent. Decidability is proved through a terminating proof search procedure, with an exponential bound to the branches of derivation trees for valid sequents, calculated on the length of the characteristic temporal formula of the endsequent
Latest Advances in the Generation of Single Photons in Silicon Carbide
No full textThe major barrier for optical quantum information technologies is the absence of reliable single photons sources providing non-classical light states on demand which can be easily and reliably integrated with standard processing protocols for quantum device fabrication. New methods of generation at room temperature of single photons are therefore needed. Heralded single photon sources are presently being sought based on different methods built on different materials. Silicon Carbide (SiC) has the potentials to serve as the preferred material for quantum applications. Here, we review the latest advances in single photon generation at room temperatures based on SiC
A Preliminary Study of a Graphene Fractal Sierpinski Antenna
No full textWe provide a preliminary study of a Graphene fractal antenna operating at THz frequencies with the opportunity to modulate the emission. There are a number of advantages of the fractal design, namely multiband/wideband ability, and, a smaller, lighter and simpler configuration for higher gain, that can benefit from the coupling with Graphene, the thinnest and strongest of materials exhibiting very high electrical conductivity and tunability. This paper proposes a conceptual background for the study and presents some preliminary results on the electromagnetic emission simulations undertake
Electrically Driven Quantum Light Sources
No full textTypical applications of quantum light require optical sources which generate either individual photons or entangled (correlated) photons. For the sake of practicality and scalability, these quantum sources should be easily produced, operate at room temperature, and be electrically excited and controlled. Here, recent research on quantum sources obtained from electrically driven (ED) devices constructed from p-n junctions integrated in planar optical cavities, micropillars, nanowires, photonic crystals, and active plasmonic elements is reviewed. Single-photon and entangled-photon sources are distinguished by their different roles in the development of either quantum cryptography or quantum computing protocols, and the different types of devices used to produce them are highlighted, with a focus on their spectral emission, brightness, and conditions of operation. Achievements to date are summarized and compared with prerequisites for the practical use of these sources. Important recent results that could provide future novel quantum sources are also in focus, where more practical requirements could be addressed by the judicious engineering of materials and careful device design
Experimental and Computational Methods for Swirl Port Design in Internal Combustion Engines
No full textThe paper reviews the minimum losses and intake flow conditioning criteria typically adopted for the design of swirl ports in two valve Direct Injection (DI) Diesel engines, as well as in some two valve Spark Ignition (SI) engines. The standard experimental practice, based on the use of steady flow discharge and swirl coefficients as a measure of port design quality is first presented. The analogous computational methodology, where the steady flow is simulated, is then introduced. The computational methodology is extensively validated against a data set for a series of ports, of the direct, hybrid and helical type. The computational methodology is finally applied to simulate the transient flow within the engine during the intake stroke. The computed Intake Valve Closure (IVC) flow field provides a more rational basis for port optimization than steady flow coefficients, even if these latter simulations have still to be properly validated
Micro-manipulation of nanodiamonds containing NV centers for quantum applications
No full textMicro-manipulations of nanodiamonds (NDs) containing Nitrogen-Vacancy (NV) centers are here reviewed. Various methods such as optical tweezers, electro-kinetic trap, ions traps, optofluidics and plasmonics applied to the specific nanomaterial are reviewed, focusing on the advantages and achievements in controlling the NDs positioning for magnetic sensing. These approaches are relevant to extend magnetic sensing and imaging in different fluid environments. Levitated NDs in vacuum using optical tweezers or ions traps are also reviewed for applications in cavity optomechanics towards establishing ultra-sensitive mechanical spin hybrid systems or nano-optomechanics devices. The current demonstrations of trapped or levitated NDs containing NV centers are relevant to fundamental studies of quantum spin-photon and mechanical systems coupling but have not yet been applied directly to biological systems, as these fields of applications present several challenges
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