The OLYMPUS Collaboration reports on a precision measurement of the positron-proton to electron-proton elastic cross section ratio, R_{2γ}, a direct measure of the contribution of hard two-photon ...exchange to the elastic cross section. In the OLYMPUS measurement, 2.01 GeV electron and positron beams were directed through a hydrogen gas target internal to the DORIS storage ring at DESY. A toroidal magnetic spectrometer instrumented with drift chambers and time-of-flight scintillators detected elastically scattered leptons in coincidence with recoiling protons over a scattering angle range of ≈20° to 80°. The relative luminosity between the two beam species was monitored using tracking telescopes of interleaved gas electron multiplier and multiwire proportional chamber detectors at 12°, as well as symmetric Møller or Bhabha calorimeters at 1.29°. A total integrated luminosity of 4.5 fb^{-1} was collected. In the extraction of R_{2γ}, radiative effects were taken into account using a Monte Carlo generator to simulate the convolutions of internal bremsstrahlung with experiment-specific conditions such as detector acceptance and reconstruction efficiency. The resulting values of R_{2γ}, presented here for a wide range of virtual photon polarization 0.456<ε<0.978, are smaller than some hadronic two-photon exchange calculations predict, but are in reasonable agreement with a subtracted dispersion model and a phenomenological fit to the form factor data.
•1H NMR fingerprinting allows to discriminate Colombian from all other coffees.•Samples are prepared in non-deuterated methanol.•Spectra are acquired using automatic suppression of solvent peaks.
The ...determination of the origin of coffee beans by NMR fingerprinting has been shown promising and classification has been reported for samples of different countries and continents. Here we show that this technique can be extended and applied to discriminate coffee samples from one country against all others, including its closest neighbors. Very high classification rates are reported using a large number of spectra (>300) acquired over a two-year period. As original aspects it can be highlighted that this study was performed in fully automatic mode and with non-deuterated coffee extracts. This is achieved using a series of experiments to procure a robust suppression of the solvent peaks. As is, the method represents a cost effective opportunity for countries to protect their national productions.
Esta investigation tiene como objetivo presentar el estado actual de preservation y accesibilidad del documento audiovisual que registre) el Juicio a las Juntas Militares Argentinas, parte esencial ...de la Historia de los Derechos Humanos en América Latina. El documento audiovisual fue digitalizado en 2012 y contiene la video grabacion completa del Juicio a las Juntas Militares Argentinas, en cuyo veredicto de 1985 los acusados fueron declarados culpables de los crímenes de lesa humanidad perpetrados durante la última dictadura militar en Argentina (1976-1983). El proyecto de digitalization es el resultado de un esfuerzo conjunto entre la Universidad de Salamanca, Memoria Abierta (Organization Argentina de Derechos Humanos) y los jueces involucrados en el caso con el apoyo de la Cámara Nacional de Apelaciones en lo Criminal y Correccional Federal de Argentina, con dos objetivos principales: la preservation y el acceso abierto del documento. Hasta la fecha solo se ha logrado la preservation tras la digitalizacion del documento, aunque es un logro notable resulta insuficiente. Teniendo en cuenta las fechas del documento se cumple con la protection de las partes involucradas en el juicio y por tanto la ausencia de restricciones legales. Tampoco existen restricciones técnicas, aun así, no es posible la consulta o el Acceso Abierto al documento desde la web, lo que ampliaría la difusion de este documento de video digitalizado de un periodo histórico de Argentina, hoy por hoy únicamente consultable in situ.
We report on the measurement of optical isotope shifts for 38, 39, 42, 44, 46–51K relative to 47K from which changes in the nuclear mean square charge radii across the N=28 shell closure are deduced. ...The investigation was carried out by bunched-beam collinear laser spectroscopy at the CERN-ISOLDE radioactive ion-beam facility. Mean square charge radii are now known from 37K to 51K, covering all νf7/2-shell as well as all νp3/2-shell nuclei. These measurements, in conjunction with those of Ca, Cr, Mn and Fe, provide a first insight into the Z dependence of the evolution of nuclear size above the shell closure at N=28.
The data retrieved from satellite imagery and ground-based photometers are the two main sources of information on light pollution and are thus the two main tools for tackling the problem of ...artificial light pollution at night (ALAN). While satellite data offer high spatial coverage, on the other hand, photometric data provide information with a higher degree of temporal resolution. Thus, studying the proper correlation between both sources will allow us to calibrate and integrate them to obtain data with both high temporal resolution and spatial coverage. For this purpose, more than 15,000 satellite measurements and 400,000 measurements from 72 photometers for the year 2022 were used. The photometers used were the Sky-Glow Wireless Autonomous Sensor (SG-WAS) and Telescope Encoder and Sky Sensor WIFI (TESS-W) types, located at different ground-based locations, mainly in Spain. These photometers have a spectral sensitivity closer to that of VIIRS than to the Sky Quality Meter (SQM). In this study, a good correlation of data from the Day–Night Band (DNB) from the Visible Infrared Imaging Radiometer Suite (VIIRS) with a red photometric network between 19.41 mag/arcsec2 and 21.12 mag/arcsec2 was obtained.
The main features of SG-WAS (SkyGlow Wireless Autonomous Sensor), a low-cost device for measuring Night Sky Brightness (NSB), are presented. SG-WAS is based on the TSL237 sensor –like the Unihedron ...Sky Quality Meter (SQM) or the STARS4ALL Telescope Encoder and Sky Sensor (TESS)–, with wireless communication (LoRa, WiFi, or LTE-M) and solar-powered rechargeable batteries. Field tests have been performed on its autonomy, proving that it can go up to 20 days without direct solar irradiance and remain hibernating after that for at least 4 months, returning to operation once re-illuminated. A new approach to the acquisition of average NSB measurements and their instrumental uncertainty (of the order of thousandths of a magnitude) is presented. In addition, the results of a new Sky Integrating Sphere (SIS) method have shown the possibility of performing mass device calibration with uncertainties below 0.02 mag/arcsec2. SG-WAS is the first fully autonomous and wireless low-cost NSB sensor to be used as an independent or networked device in remote locations without any additional infrastructure.
...intravenous injection of mouse melanoma skincancer or lung-cancer cells into mice caused lung endothelial cells to undergo necroptotic death. Another possibility is that damage-associated ...molecular pattern molecules (DAMPs), such as ATP released from necroptotic endothelial cells, could act on neighbouring endothelial cells to open the endothelial barrier by enabling tumour-cell migration between neighbouring endothelial cells that are usually bound together to form an impermeable barrier, and/or these signals could act directly on tumour cells to enhance their migration across the barrier8.
We show that for a legitimate communication under multipath quasi-static fading with a reduced number of scatterers, it is possible to achieve perfect secrecy even in the presence of a passive ...eavesdropper for which no channel state information (CSI) is available. Specifically, we show that the outage probability of secrecy capacity (OPSC) is zero for a given range of average signal-to-noise ratios (SNRs) at the legitimate and eavesdropper's receivers. As an application example, we analyze the OPSC for the case of two scatterers, explicitly deriving the relationship between the average SNRs, the secrecy rate <inline-formula> <tex-math notation="LaTeX">R_{S} </tex-math></inline-formula> and the fading model parameters required for achieving perfect secrecy. The impact of increasing the number of scatterers is also analyzed, showing that it is always possible to achieve perfect secrecy in this scenario, provided that (<inline-formula> <tex-math notation="LaTeX">{i} </tex-math></inline-formula>) the dominant specular component for the legitimate channel is sufficiently large compared to the remaining scattered waves, and ( ii ) a exclusion area on which no eavesdroppers can be placed is considered.
N(6)-methyladenosine (m(6)A) is the most abundant internal modification of messenger RNA. While the presence of m(6)A on transcripts can impact nuclear RNA fates, a reader of this mark that mediates ...processing of nuclear transcripts has not been identified. We find that the RNA-binding protein HNRNPA2B1 binds m(6)A-bearing RNAs in vivo and in vitro and its biochemical footprint matches the m(6)A consensus motif. HNRNPA2B1 directly binds a set of nuclear transcripts and elicits similar alternative splicing effects as the m(6)A writer METTL3. Moreover, HNRNPA2B1 binds to m(6)A marks in a subset of primary miRNA transcripts, interacts with the microRNA Microprocessor complex protein DGCR8, and promotes primary miRNA processing. Also, HNRNPA2B1 loss and METTL3 depletion cause similar processing defects for these pri-miRNA precursors. We propose HNRNPA2B1 to be a nuclear reader of the m(6)A mark and to mediate, in part, this mark's effects on primary microRNA processing and alternative splicing. PAPERCLIP.
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