On Feasibility and Performance of Rowhammmer Attack

In this paper we study the Rowhammer sidechannel attack and evaluate its feasibility on practical exploitation scenarios in Linux. Currently, all the implementations released, capable of performing the Rowhammer attack, require elevated privileges. This is a very strong requirement which, in a sense, puts ths attack into the theoretical spectrum. The purpose of this report is to explore different techniques that would allow the execution of the Rowhammer attack in userspace. More specifically, we provide two implementations, each of them having different strength of requirements but with one characteristic in common: the capability of executing the Rowhammer attack without elevated privileges. At the end, we see that not only it was possible to reach similar levels of performance with the programs that required elevated privileges, but in some cases even outperform them, in both native and virtual environments

On the paleogeographic distribution of the Late Maastrichtian planktonic foraminiferal genus Kassabiana SALAJ&SOLAKIUS, 1984

Representatives of the planktonic foraminiferal genus Kassabiana SALAJ & SOLAKIUS, 1984, are recorded in the uppermost Maastrichtian beds from the Parnassus-Ghiona and Pindus Zones, Greece. The new records have extended the known paleogeographic distribution of the species of Kassabiana in south Tethys northwards to the 30. N paleolatitude. The distribution was restricted to tropical waters since all the records of the species of Kassabiana are from areas which were situated at low latitudes during the Maastrichtian

Investigating the Effect of Reaction Time on Carbon Dot Formation, Structure, and Optical Properties

Carbon dots, a young member of the carbon nanomaterial family, are quasi-spherical nanoparticles, which have fluorescent properties as their key characteristic. A wide range of starting materials and synthetic routes have been reported in the literature, divided into two main categories: a top-down and bottom-up approach. Moreover, a series of different parameters that affect the properties of carbon dots have been investigated, including temperature, starting pH, as well as precursor concentration. However, the effect of reaction time has not been extensively monitored. In our study, a biomass derivative was treated hydrothermally with varying reaction times to draw a solid formation mechanism. In addition, we monitored the effect of reaction time on optical and structural characteristics, as well as the chemical composition of our materials. Our key findings include a four-stage formation mechanism, a higher level of crystallinity, and an increasing brightness over reaction time

On the paleogeographic distribution of the Late Maastrichtian planktonic foraminiferal genus Kassabiana SALAJSOLAKIUS, 1984

Representatives of the planktonic foraminiferal genus Kassabiana SALAJ & SOLAKIUS, 1984, are recorded in the uppermost Maastrichtian beds from the Parnassus-Ghiona and Pindus Zones, Greece. The new records have extended the known paleogeographic distribution of the species of Kassabiana in south Tethys northwards to the 30. N paleolatitude. The distribution was restricted to tropical waters since all the records of the species of Kassabiana are from areas which were situated at low latitudes during the Maastrichtian

MIOCENE SCLERACTINIAN CORALS OF GAVDOS ISLAND, SOUTHERN GREECE: IMPLICATIONS FOR TECTONIC CONTROL AND SEA-LEVEL CHANGES

Low-diversity scleractinian patch reefs that have been developed, during Early to Middle Tortonian, in Gavdos island are studied, aiming in a better understanding of the time and space relationships of the reef development and the associated basin fill evolution. Gavdos island consists part of a tectonically active setting constituting the southernmost extension of the Hellenic arc (Eastern Mediterranean). A representative Tortonian section (Bo section), located in the northwest part of the island, which hosts a mass occurrence of hermatypic corals, is studied. Scleractinian samples were collected from the upper 12 m of the section, which is characterized by interchanges of marly limestone and compact marls. The reefs are represented by the coral species Heliastraea oligophylla, Porites maicientensis, Thegioastraea roasendai and Porites collegniana. The microfacies analysis showed that the mediumto-thin-bedded carbonates of the limestone-marl alternations comprise patch reefs (boundstones-framestones, SMF 16, sensu Wilson, 1975, FZ 7-8, sensu Flügel 1982) consisted of screractinian corals. Corals are associated with corallinacean algae. Patch reefs are associated by bioclastic packstones-floatstones, characterized by benthic foraminifera, calcareous algae, spines of echinoids, gastropods and molluscs. Reefs are laterally associated by a bioclastic limestone rich in planktonic forams, associated by detrital material (fragments of quartz, feldspars, quartzites and cherts). The studied reef facies have been dolomitized and cemented in the meteoric realm. In places pseudomorphs after evaporites have been observed, tending to occlude cavities resulted after dissolution. The depositional environment corresponds to a moderate to high-energy inner platform setting, experiencing open-ocean influences. The pattern of coralgal reef development during Miocene, in the tectonically controlled Gavdos island, represents a complex interaction of tectonic activity and global sea-level changes

Thermodynamic description of U(IV) solubility and hydrolysis in chloride systems: Pitzer activity model for the system U4+^{4+}–Na+^+–Mg2+^{2+}–Ca2+^{2+}–H+^+–Cl−^-–OH−^-–H2_2O(l)

This study presents updated chemical, thermodynamic, and activity models for the system U$^{4+}$–Na$^+$–Mg$^{2+}$–Ca$^{2+}$–H$^+$–Cl$^-$–OH$^-$–H$_2$O(l)derived using the Pitzer formalism and a strict ion interaction approach. The models build on comprehensive solubility datasets in dilute to concentrated NaCl, MgCl$_2$, and CaCl$_2$ solutions. The Nuclear Energy Agency-Thermochemical Database (NEA-TDB) selection of solubility and hydrolysis constants in the reference state were taken as anchoring point, and were extended further with the solid nanocrystalline phase UO$_2$∙H$_2$O(ncr) and the ternary complex Ca$_4$[U(OH)$_8$]$^{4+}$. The former was identified in long-term solubility experiments at ambient conditions, whereas the latter has been selected in analogy to Th(IV), Np(IV), and Pu(IV) considering experimental evidences available for these An(IV) in alkaline, concentrated CaCl$_2$ solutions. These models represent an improved tool for the calculation of U(IV) solubility and aqueous speciation in a variety of geochemical conditions including concentrated brine systems relevant in salt-based repositories for nuclear waste disposal