Contacting individual Fe(110) dots in a single electron-beam lithography step

We report on a new approach, entirely based on electron-beam lithography technique, to contact electrically, in a four-probe scheme, single nanostructures obtained by self-assembly. In our procedure, nanostructures of interest are localised and contacted in the same fabrication step. This technique has been developed to study the field-induced reversal of an internal component of an asymmetric Bloch domain wall observed in elongated structures such as Fe(110) dots. We have focused on the control, using an external magnetic field, of the magnetisation orientation within N\'eel caps that terminate the domain wall at both interfaces. Preliminary magneto-transport measurements are discussed demonstrating that single Fe(110) dots have been contacted.Comment: 5 page

New Observing Modes for the DBBC3

The DBBC3 was further enhanced by introducing\ua0new modes. Three different firmwares have\ua0recently been implemented for observing: Direct Sampling\ua0Conversion (DSC), arbitrary selection of bands\ua0(OCT), and Digital Down Conversion (DDC). These\ua0modes cover all the requirements of astronomical,\ua0VGOS, and legacy geodetic VLBI for the time being\ua0and the immediate future. In addition, the DBBC3\ua0offers unsurpassed compatibility to the relatively large\ua0number of other existing VLBI backends. A number\ua0of test observations were performed in the last months\ua0to achieve the best performance of the VGOS modes,\ua0and similar tests are planned for the EVN network. At\ua0the same time the DBBC3 is an important platform\ua0for additional new modes to be implemented for\ua0the BRAND receiver. Several DBBC3 systems are\ua0deployed in the field and more are under construction,\ua0with the number of 4-GHz bands ranging from two up\ua0to eight with resulting output data rates from 32 Gbps\ua0to 128 Gbps

DBBC3 Towards the BRAND EVN Receiver

The DBBC3 is a flexible VLBI backend and\ua0environment that supports a wide range of observational\ua0needs via a suite of FPGA firmware types. The\ua0hardware can sample up to eight 4 GHz-wide baseband\ua0signals and convert to digital streams over multiple\ua010GE links on fibre. The development team has an ongoing\ua0development programme that has enhanced existing\ua0modes and introduced new desired modes as user\ua0requirements evolve. Three dierent firmware types for\ua0observing have been implemented which will be briefly\ua0summarised: Direct Sampling Conversion (DSC), arbitrary\ua0selection of bands (OCT), Digital Down Conversion\ua0(DDC). These modes cover all the requirements\ua0of astronomical, VGOS and legacy geodetic VLBI of\ua0the present, but also of the near future. At the same\ua0time the DBBC3 is an important platform for additional\ua0new modes to be implemented for the BRAND\ua0receiver. This paper describes the use of the DBBC3\ua0for the receiver development, pointing out which element\ua0in the current DBBC3 structure will be part of\ua0the BRAND receiver in order to simplify its introduction\ua0into the existing VLBI environment at telescopes\ua0with a DBBC3 backend

The EUropean-VGOS Project

In Spring 2018 the Bonn correlation centre\ua0started a collaboration with the three European stations\ua0of Wettzell, Onsala and Yebes, equipped with\ua0both S/X- and broadband systems, to perform VGOS-like test sessions. The aim is to verify and develop further\ua0the processing chain for VGOS experiments end-to-end, from the scheduling to the analysis of the derived\ua0observables. We will present the current status of\ua0the project

CpG-depleted promoters harbor tissue-specific transcription factor binding signals—implications for motif overrepresentation analyses

Motif overrepresentation analysis of proximal promoters is a common approach to characterize the regulatory properties of co-expressed sets of genes. Here we show that these approaches perform well on mammalian CpG-depleted promoter sets that regulate expression in terminally differentiated tissues such as liver and heart. In contrast, CpG-rich promoters show very little overrepresentation signal, even when associated with genes that display highly constrained spatiotemporal expression. For instance, while ∼50% of heart specific genes possess CpG-rich promoters we find that the frequently observed enrichment of MEF2-binding sites upstream of heart-specific genes is solely due to contributions from CpG-depleted promoters. Similar results are obtained for all sets of tissue-specific genes indicating that CpG-rich and CpG-depleted promoters differ fundamentally in their distribution of regulatory inputs around the transcription start site. In order not to dilute the respective transcription factor binding signals, the two promoter types should thus be treated as separate sets in any motif overrepresentation analysis

Current Status of the EU-VGOS Project

The EU-VGOS project began in 2018 with\ua0the aim of using the VGOS infrastructure in Europe\ua0to investigate methods for VGOS data processing. The\ua0project is now structured into Working Groups dealing\ua0with operations (stations), e-transfer, correlation and\ua0post-processing, and analysis. This is a report on the\ua0status of the project

Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements

Sea ice drift, surface temperature, and barometric pressure from autonomous measurements from buoy 2018C27, deployed during ASIMBO 2018

Sea ice drift, surface temperature, and barometric pressure were measured by the Compact Air-Launched Ice Beacon (CALIB) 2018C27 drifting on Arctic sea ice deployed by air-plane drop off during ASIMBO 2018. The time series describes the position and additional parameters of the buoy between 13 August 2018 and 30 January 2019 in sample intervals of 1 hour. The data set has been processed, including the removal of obvious inconsistencies (missing values)

Size dependence of exchange bias in Co/CoO nanostructures

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