A low power photoemission source for electrons on liquid helium

Electrons on the surface of liquid helium are a widely studied system that may also provide a promising method to implement a quantum computer. One experimental challenge in these studies is to generate electrons on the helium surface in a reliable manner without heating the cryo-system. An electron source relying on photoemission from a zinc film has been previously described using a high power continuous light source that heated the low temperature system. This work has been reproduced more compactly by using a low power pulsed lamp that avoids any heating. About 5e3 electrons are collected on 1 cm^2 of helium surface for every pulse of light. A time-resolved experiment suggests that electrons are either emitted over or tunnel through the 1eV barrier formed by the thin superfluid helium film on the zinc surface. No evidence of trapping or bubble formation is seen.Comment: 9 pages, 3 figures, submitted to J. Low Temp. Phy

Measurement of the Charge Transfer Efficiency of Electrons Clocked on Superfluid Helium

Electrons floating on the surface of liquid helium are possible qubits for quantum information processing. Varying electric potentials do not modify spin states, which allows their transport on helium using a charge-coupled device (CCD)-like array of underlying gates. This scheme depends upon efficient inter-gate electron transfer and on the absence of electron traps. We will present a measurement of the charge transfer efficiency (CTE) of electrons clocked back and forth above a short CCD-like structure. The CTE obtained at low clocking frequencies is 0.999 with an electron density of about 4 electrons per square micrometer. We find no evidence for deep electron trapping.Comment: 8 pages, 3 figures (corrected typos and added details on experimental procedure), submitted to AP

Signal and Charge Transfer Efficiency of Few Electrons Clocked on Microscopic Superfluid Helium Channels

Electrons floating on the surface of liquid helium are possible spin-qubits for quantum information processing. Varying electric potentials are not expected to modify spin states, which allows their transport on helium using a charge-coupled device (CCD)-like array of underlying gates. This approach depends upon efficient inter-gate transfer of individual electrons. Measurements are presented here of the charge transfer efficiency (CTE) of few electrons clocked back and forth above a short microscopic CCD-like structure. A charge transfer efficiency of 0.99999992 is obtained for a clocking frequency of 800 kHz.Comment: 13 pages including 3 figure

Design and analysis of cross vaults along history

The history of cross vaults began almost 2,000 years ago with a widespread use during the Middle Ages and Renaissance, becoming nowadays one of the most diffused and fascinating structural typologies of the European building cultural heritage. However, conversely to the undeniable excellence achieved by the ancient masons, the structural behavior of these elements is still at the center of the scientific debate. In this regard, with the aim of reviewing the knowledge on this subject as a concise and valuable support for researchers involved in conservation of historical buildings, with a focus on design rules and structural analysis, the present study firstly introduces the cross vaults from a historical perspective, by describing the evolution of the main geometrical shapes together with basic practical rules used to size them. Then, the article deals with the subsequent advancements in structural analysis methods of vaults, until the development of modern limit analysis.This work was partially carried out under the program "Dipartimento di Protezione Civile - Consorzio RELUIS", signed on 2013-12-27.info:eu-repo/semantics/publishedVersio

How to fill the GAPS-I in secondary prevention. Application of a strategy based on GLP1 analogues, antithrombotic agents, PCSK9 inhibitors, SGLT2 inhibitors and immunomodulators

The continuous progress in cardiovascular risk prevention strategies has led to an impressive reduction in mortality and recurrent ischemic events in patients with coronary artery disease (CAD). However, the control of several cardiovascular risk factors remains suboptimal in many CAD patients, with a high rate of recurrent events, underlying the need for more new prevention strategies. The GAPS-I (glucagon-like peptide 1 analogues, antithrombotic agents, proprotein convertase subtilisin/kexin type 9 inhibitors, sodium glucose cotransporter type 2 inhibitors and immunomodulators) strategy offers a promising potential in patients with a high-residual cardiovascular risk, who are frequently encountered in daily practice, by offering an individualized and structured approach to addressing their individual risk factors. The current review summarizes the evidence to date on each of its components, with respect to clinical outcomes and economic feasibility. The current evidence points to an efficacy of GAPS-I in reducing major adverse cardiovascular events and mortality, without a compromise on safety, albeit with the need for longer follow-up data

Material and electrical characterization of TMS-based silicidation of the Cu-dielectric barrier interface for electromigration improvement of 65 nm interconnects

International audienc

Material and electrical characterization of TMS-based silicidation of the Cu-dielectric barrier interface for electromigration improvement of 65 nm interconnects

International audienc

Platelet function testing predicts bleeding complications in elderly patients admitted for an acute coronary syndrome: insights from the ANTARCTIC trial

International audienc