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排序方式: 共有185条查询结果,搜索用时 15 毫秒
31.
Nicola Biagi Saverio Francesconi Alessandro Zavatta Marco Bellini 《Entropy (Basel, Switzerland)》2021,23(8)
We present a concise review of recent experimental results concerning the conditional implementation of coherent superpositions of single-photon additions onto distinct field modes. Such a basic operation is seen to give rise to a wealth of interesting and useful effects, from the generation of a tunable degree of entanglement to the birth of peculiar correlations in the photon numbers and the quadratures of multimode, multiphoton, states of light. The experimental investigation of these properties will have an impact both on fundamental studies concerning, for example, the quantumness and entanglement of macroscopic states, and for possible applications in the realm of quantum-enhanced technologies. 相似文献
32.
V. Kuznetsov V. Bellini V. Brio A. Gridnev N. Kozlenko F. Mammoliti F. Tortorici M. V. Polyakov G. Russo M. L. Sperduto V. Sumachev C. M. Sutera 《JETP Letters》2017,105(10):625-630
Different interpretations of narrow structures at W ~ 1.68 and 1.72 GeV observed in several reactions are discussed. It is questionable whether interference phenomena could explain the whole complex of experimental findings. More probable hypotheses would be the existence of one or two narrow resonances N(1685) and N(1726) and/or the sub-threshold virtual KΣ and ωp production (cusps). 相似文献
33.
We report on the integration of a size-based three-dimensional filter, with micrometre-sized pores, in a commercial microfluidic chip. The filter is fabricated inside an already sealed microfluidic channel using the unique capabilities of two-photon polymerization. This direct-write technique enables integration of the filter by post-processing in a chip that has been fabricated by standard technologies. The filter is located at the intersection of two channels in order to control the amount of flow passing through the filter. Tests with a suspension of 3 μm polystyrene spheres in a Rhodamine 6G solution show that 100% of the spheres are stopped, while the fluorescent molecules are transmitted through the filter. We demonstrate operation up to a period of 25 minutes without any evidence of clogging. Preliminary validation of the device for plasma separation from whole blood is shown. Moreover, the filter can be cleaned and reused by reversing the flow. 相似文献
34.
F Bragheri P Minzioni R Martinez Vazquez N Bellini P Paiè C Mondello R Ramponi I Cristiani R Osellame 《Lab on a chip》2012,12(19):3779-3784
The main trend in optofluidics is currently towards full integration of the devices, thus improving automation, compactness and portability. In this respect femtosecond laser microfabrication is a very powerful technology given its capability of producing both optical waveguides and microfluidic channels. The current challenge in biology is the possibility to perform bioassays at the single cell level to unravel the hidden complexity in nominally homogeneous populations. Here we report on a new device implementing a fully integrated fluorescence-activated cell sorter. This non-invasive device is specifically designed to operate with a limited amount of cells but with a very high selectivity in the sorting process. Characterization of the device with beads and validation with human cells are presented. 相似文献
35.
Gadzikwa T Bellini R Dekker HL Reek JN 《Journal of the American Chemical Society》2012,134(6):2860-2863
A chiral supramolecular ligand has been assembled and applied to the rhodium-catalyzed asymmetric hydroformylation of unfunctionalized internal alkenes. Spatial confinement of the metal center within a chiral pocket results in reversed regioselectivity and remarkable enantioselectivities. 相似文献
36.
Ahmed Z Allada K Aniol KA Armstrong DS Arrington J Baturin P Bellini V Benesch J Beminiwattha R Benmokhtar F Canan M Camsonne A Cates GD Chen JP Chudakov E Cisbani E Dalton MM de Jager CW De Leo R Deconinck W Decowski P Deng X Deur A Dutta C Franklin GB Friend M Frullani S Garibaldi F Giusa A Glamazdin A Golge S Grimm K Hansen O Higinbotham DW Holmes R Holmstrom T Huang J Huang M Hyde CE Jen CM Jin G Jones D Kang H King P Kowalski S Kumar KS Lee JH LeRose JJ Liyanage N Long E McNulty D 《Physical review letters》2012,108(10):102001
The parity-violating cross-section asymmetry in the elastic scattering of polarized electrons from unpolarized protons has been measured at a four-momentum transfer squared Q2 = 0.624 GeV2 and beam energy E(b) = 3.48 GeV to be A(PV) = -23.80 ± 0.78(stat) ± 0.36(syst) parts per million. This result is consistent with zero contribution of strange quarks to the combination of electric and magnetic form factors G(E)(s) + 0.517G(M)(s) = 0.003 ± 0.010(stat) ± 0.004(syst) ± 0.009(ff), where the third error is due to the limits of precision on the electromagnetic form factors and radiative corrections. With this measurement, the world data on strange contributions to nucleon form factors are seen to be consistent with zero and not more than a few percent of the proton form factors. 相似文献
37.
T. Arecchi M. Bellini C. Corsi R. Fontana M. Materazzi L. Pezzati A. Tortora 《Optics and Spectroscopy》2006,101(1):23-26
Nondestructive techniques have seen successful growth in the last few years, and, among them, optical ones are widespread
and extremely well received in the field of painting diagnostics because of their effectiveness and safety. At present, many
techniques for nondestructive investigations of paintings are available; nevertheless, none of them is suitable for a quantitative
characterization of varnish. However, varnish removal, either partial or complete, is a fundamental part of the cleaning process,
which is an essential step in painting conservation. This critical process has been carried out, up to now, without the possibility
of any non-destructive measurement for assessing the actual varnish thickness, but with microscopic observation of a detached
microfragment. Optical coherence tomography (OCT) is a noninvasive technique that is well established for biomedical applications.
In this work, we present a novel application of OCT to measure the varnish film thickness for painting diagnostics.
The text was submitted by the authors in English. 相似文献
38.
M. Anabitarte J. E. M. Aguilar M. Bellini 《The European Physical Journal C - Particles and Fields》2006,45(1):249-256
We study a non-perturbative single field (inflaton) governed cosmological model from a 5D non-compact Kaluza-Klein (NKK) theory
of gravity. The inflaton field fluctuations are estimated for different epochs of the evolution of the universe. We conclude
that the inflaton field has been sliding down its (quadratic) potential hill along the whole evolution of the universe and
a mass is involved of the order of the Hubble parameter. In the model here developed the only free parameter is the Hubble
parameter, which could be reconstructed in the future from Super Nova Acceleration Probe (SNAP) data.
Received: 17 August 2005, Revised: 12 September 2005, Published online: 14 October 2005
PACS:
04.20.Jb, 11.10.kk, 98.80.Cq 相似文献
39.
Stefaan Cottenier Veerle Vanhoof Doru Torumba Valerio Bellini Mehmet Çakmak Michel Rots 《Hyperfine Interactions》2004,158(1-4):9-18
For some years already, ab initio calculations based on Density Functional Theory (DFT) belong to the toolbox of the field of hyperfine interaction studies.
In this paper, the standard ab initio approach is schematically sketched. New features, methods and possibilities that broke through during the past few years
are listed, and their relation to the standard approach is explained. All this is illustrated by some highlights of recent
ab initio work done by the Nuclear Condensed Matter Group at the K.U.Leuven. 相似文献
40.
J. Julien M. Boloré H. Dabrowski J. M. Hisleur V. Bellini A. S. Figuera R. Fonte A. Insolia G. F. Palama G. V. Russo M. L. Sperduto J. Chauvin P. De Saintignon D. Lebrun D. Rebreyend 《Zeitschrift für Physik A Hadrons and Nuclei》1988,330(1):83-86
Inclusive production of neutral pions has been studied in16O +27Al,197Au reactions at 38 MeV/u and20Ne +27Al reaction at 200 MeV/u. A setup of 10 Pb glass Cherenkov detector telescopes was used to detect the twoγ rays from theπ 0 decay. 相似文献