ExxonMobil in Europe’s Shale Gas Fields: Quitting Early or Fighting It Out?

This article focuses on the oil and gas supermajor, ExxonMobil, and its business in the unconventional gas field in Europe. The purpose was to investigate whether and how ExxonMobil runs its natural gas operations differently among European countries and possible reasons for divergent strategies. After a brief introduction of the firm, ExxonMobil’s approach in Europe in general will be discussed. Two countries are in focus: Poland and Germany. The key finding is that the firm indeed has shown different approaches and strategies. In Poland, ExxonMobil faced a supportive, positive environment but quit quickly when its small investment resulted only in disappointing results. The firm, however, was a newcomer which had not much to lose. In contrast, its German unconventional gas operations are connected to broad conventional activities and are being defended by an extensive effort to win back public support

Microscopic Origin of the Valley Hall Effect in Transition Metal Dichalcogenides Revealed by Wavelength Dependent Mapping

The band structure of many semiconducting monolayer transition metal dichalcogenides (TMDs) possesses two degenerate valleys, with equal and opposite Berry curvature. It has been predicted that, when illuminated with circularly polarized light, interband transitions generate an unbalanced non-equilibrium population of electrons and holes in these valleys, resulting in a finite Hall voltage at zero magnetic field when a current flows through the system. This is the so-called valley Hall effect that has recently been observed experimentally. Here, we show that this effect is mediated by photo-generated neutral excitons and charged trions, and not by inter-band transitions generating independent electrons and holes. We further demonstrate an experimental strategy, based on wavelength dependent spatial mapping of the Hall voltage, which allows the exciton and trion contributions to the valley Hall effect to be discriminated in the measurement. These results represent a significant step forward in our understanding of the microscopic origin of photo-induced valley Hall effect in semiconducting transition metal dichalcogenides, and demonstrate experimentally that composite quasi-particles, such as trions, can also possess a finite Berry curvature.Comment: accepted for publication in Nano Letter

Lithium-ion conducting glass ceramics for electrostatic gating

We explore solid electrolytes for electrostatic gating using field-effect transistors (FETs) in which thin WSe$_2$ crystals are exfoliated and transferred onto a lithium-ion conducting glass ceramic substrate. For negative gate voltages ($V_G < 0$) the devices work equally well as ionic liquid gated FETs while offering specific advantages, whereas no transistor action is seen for $V_G>0$. For $V_G <0$ the devices can nevertheless be driven into the ambipolar injection regime by applying a large source-drain bias, and strong electroluminescence is observed when direct band-gap WSe$_2$ monolayers are used. Detecting and imaging the emitted light is much simpler in these FETs as compared to ionic liquid gated transistors, because the semiconductor surface is exposed (i.e., not covered by another material). Our results show that solid electrolytes are complementary to existing liquid gates, as they enable experiments not possible when the semiconductor is buried under the liquid itself

ExxonMobil in Europe’s Shale Gas Fields: Quitting Early or Fighting It Out?

This article focuses on the oil and gas supermajor, ExxonMobil, and its business in the unconventional gas field in Europe. The purpose was to investigate whether and how ExxonMobil runs its natural gas operations differently among European countries and possible reasons for divergent strategies. After a brief introduction of the firm, ExxonMobil’s approach in Europe in general will be discussed. Two countries are in focus: Poland and Germany. The key finding is that the firm indeed has shown different approaches and strategies. In Poland, ExxonMobil faced a supportive, positive environment but quit quickly when its small investment resulted only in disappointing results. The firm, however, was a newcomer which had not much to lose. In contrast, its German unconventional gas operations are connected to broad conventional activities and are being defended by an extensive effort to win back public support.Keywords: energy, energy policy, ExxonMobil, fracking, Germany, hydraulic fracturing, Poland, public acceptance, regulatory politics, shale gas, unconventional gas, US

A Missense Mutation in PPP1R15B Causes a Syndrome Including Diabetes, Short Stature, and Microcephaly.

Dysregulated endoplasmic reticulum stress and phosphorylation of eukaryotic translation initiation factor 2α (eIF2α) are associated with pancreatic β-cell failure and diabetes. Here, we report the first homozygous mutation in the PPP1R15B gene (also known as constitutive repressor of eIF2α phosphorylation [CReP]) encoding the regulatory subunit of an eIF2α-specific phosphatase in two siblings affected by a novel syndrome of diabetes of youth with short stature, intellectual disability, and microcephaly. The R658C mutation in PPP1R15B affects a conserved amino acid within the domain important for protein phosphatase 1 (PP1) binding. The R658C mutation decreases PP1 binding and eIF2α dephosphorylation and results in β-cell apoptosis. Our findings support the concept that dysregulated eIF2α phosphorylation, whether decreased by mutation of the kinase (EIF2AK3) in Wolcott-Rallison syndrome or increased by mutation of the phosphatase (PPP1R15B), is deleterious to β-cells and other secretory tissues, resulting in diabetes associated with multisystem abnormalities.This work was supported by the European Union 7th Framework Programme (project BetaBat), the Actions de Recherche Concertées de la Communauté Française, and Fonds National de la Recherche Scientifique (FNRS), Belgium, and by grants from the Agence Nationale pour la Recherche (ANR-09-GENO-021), the European Foundation for the Study of Diabetes/JDRF/Novo Nordisk, the Assistance Publique-Hôpitaux de Paris Programme Hospitalier de Recherche Clinique (DIAGENE), the GIS Maladies Rares, and the Wellcome Trust (084812/Z/08/Z). A.T.H. is a Wellcome Trust and National Institute for Health Research senior investigator, and D.R. is a Wellcome Trust Principal Research Fellow. B.A. was supported by an European Molecular Biology Organization Short-Term Fellowship and an FNRS-FRIA fellowship. M.I.-E. is a scientific collaborator of the FNRS. M.D. was supported by a doctoral fellowship from the Ministère de l’Education Nationale, de l’Enseignement Supérieur et de la Recherche, France.This is the author accepted manuscript. The final version is available from the American Diabetes Association via http://dx.doi.org/10.2337/db15-047

Zero to eight : young children and their internet use

EU Kids Online has spent seven years investigating 9-16 year olds’ engagement with the internet, focusing on the benefits and risks of children’s internet use. While this meant examining the experiences of much younger children than had been researched before EU Kids Online began its work in 2006, there is now a critical need for information about the internet-related behaviours of 0-8 year olds. EU Kids Online’s research shows that children are now going online at a younger and younger age, and that young children’s “lack of technical, critical and social skills may pose [a greater] risk” (Livingstone et al, 2011, p. 3).peer-reviewe

Valley Hall Effect and New Gating Techniques for Atomically Thin Transition Metal Dichalcogenides

In 2004, A. Geim and K. Novoselov realized the first isolation of a one-atom-thick material, graphene. The discovery of graphene, which was immediately followed by that of many other 2D materials with a large variety of physical properties, has paved the way to study physical properties in condensed matter systems down to the atomic limit. In this thesis, we investigate the properties of layered semiconducting compounds known as transition metal dichalcogenides. We investigate a peculiar effect known as the valley Hall effect, only present in the monolayers of these compounds, and gain an understanding on the detailed microscopic processes involved. We also report on the development of new gating techniques for atomically thin crystals using ionic gates that allow to apply extremely large electric fields perpendicular to the surface of the material. We demonstrate the closing of a 1.5eV semiconducting gap in atomically thin crystals thanks to this applied perpendicular electric field

Lithium-ion conducting glass ceramics for electrostatic gating

AbstractData set for: Applied Physics Letters 113, 033502 (2018) https://doi.org/10.1063/1.503840