Design, simulation and optimization of multi-layered MoS2 based FET devices

Transition-metal Dichalcogenides (TMDs) materials are getting attention in the emerging trends of electronic devices development for a variety of applications. One of such materials is MoS2 which is best suited for developing deeply scaled field effect transistors (FETs). With the plethora of TMDs available, MoS2 is the most widely studied and used material because of its tunable properties like band gap, morphology, optical, structural, electrical, flexible etc. This paper represents the design and simulation aspect of the multi-layered MoS2 Based FET devices. Evidence of change in comparative electrical characteristics of MoS2 based FET devices due to variation of thickness and doping of the gate layer are also presented. In this contribution, we have simulated a full-wave model using the COMSOL Multiphysics module for two different thicknesses 0.7 nm and 1 nm. The FET device with 1 nm MoS2 offers a better dynamic range of operation and has a broader spectrum of threshold potential. The characteristic plots of the 1 nm device showed very less deviation from ideal trends than in the 0.7 nm device. The optimized FET structure offers better performance and efficiency in terms of electrical properties.

Metals likely promoted protometabolism in early ocean alkaline hydrothermal systems

One of the most plausible scenarios of the origin of life assumes the preceding prebiotic autotrophic metabolism in sulfide-rich hydrothermal vent environments. However, geochemical mechanisms to harness the reductive power provided by hydrothermal systems remain to be elucidated. Here, we show that, under a geoelectrochemical condition realizable in the early ocean hydrothermal systems, several metal sulfides (FeS, Ag2S, CuS, and PbS) undergo hour- to day-scale conversion to the corresponding metals at ≤−0.7 V (versus the standard hydrogen electrode). The electrochemically produced FeS-Fe0 assemblage promoted various reactions including certain steps in the reductive tricarboxylic acid cycle with efficiencies far superior to those due to pure FeS. The threshold potential is readily generated in the H2-rich alkaline hydrothermal systems that were probably ubiquitous on the Hadean seafloor. Thus, widespread metal production and metal-sustained primordial metabolism were likely to occur as a natural consequence of the active hydrothermal processes on the Hadean Earth.

High performance photoanodic catalyst prepared from an active organic photovoltaic cell – high potential gain from visible light

Photoelectrochemical oxidation of thiols was enhanced with a threshold potential of −0.35 V vs. Ag/AgCl by a ZnPc/PCBM:P3HT/ZnO electode, which was prepared by removing the PEDOT:PSS/Au electrode of an inverted OPV device and coating it with ZnPc.

Potentiostatic threshold potentials of stainless steels

Potentiodynamic measurements are used to determine key potentials to classify certain corrosion properties. The material selection for components (e.g. shafts) in corrosive environments is widely based upon these potentiodynamic measurements. Criticism for using these potentials for component design has been expressed in literature. Potentiostatic measurements are known to represent the long term corrosive impact experienced by components in a more realistic manner but are prone to scatter. Therefore a statistical approach called staircase method was adapted to the given electrochemical problem. With using this staircase method, a reliable value for the median potential (threshold potential) can be determined. This potential defines the threshold between anodic dissolution and cathodic protection. For the first time, this newly defined potentiostatic threshold potential is offering a validated median potential value for corrosion prediction in a given corrosion system based on potentiostatic measurements. Threshold potentials for the stainless steel grades 1.4057 and 1.4542 were investigated in aerated electrolytes at 25°C with different chloride ion concentrations.

Potentiel Physique et Auto-évaluation Corporelle Chez des Jeunes Étudiants à Abidjan

The body of the young man seems to be characterized by a specific plasticity. This chrono-individual body modification oftentimes leads the young person to evaluate his own body according to body acquisitions. The relationship between these two variables is far from being sufficiently studied. This paper focuses on examining the self-evaluation of the body according to the physical potential. It covers 181 young people between the ages of 18 and 25, including 84 boys and 97 girls. Body self-judgment of the subjects was measured with a specific scale. In this case, it was measured by the study of Lentillon-Kaestner et al. The physical potential of young people was explored by considering weight, height, Body Mass Index (BMI) and Fat Mass Index (FMI) of the latter. The physical parameters were measured using the scales (weight) and the height gauge (stature). As for the body composition indices, they were calculated from the physical parameters previously indicated. The results obtained, after the comparisons of the subjects with each other, show that young people aged 18-21 years of physical threshold potential exhibit statistically high body self-acceptance frequency to that of their subthreshold potential counterparts and suprathreshold physical potential. Similar results were observed in young people between 22 and 25 years of age. In this group, those with a threshold of physical potential were more acceptable compared to their peers of subthreshold physical potential and supraliminal physical potential. Taking into account sex, girls aged 18 to 21 with a threshold physical potential do not differ from their peers with subthreshold physical potential and suprathreshold physical potential in terms of low body self-acceptance. The results are identical for men aged 18 to 21 and 22 to 25. The meaning of the results does not change when comparing girls with subthreshold physical potential to boys of identical physical potential.The observations made at the latter were repeated when comparing girls to boys of physical threshold potential. In girls aged 22 to 25, girls with subthreshold physical potential and suprathreshold or threshold were superimposed on their male counterparts of subthreshold physical potential and suprathreshold or threshold. This, however, is in regards to the frequency of body self-acceptance. In this sense, the physical potential of the young would not influence the bodily self-evaluation of the latter when the sex intervenes. On the other hand, considering all young people, their physical density varies based on their body self-evaluation.

Suppression of epileptic seizures via Anderson localization

Here we show that brain seizures can be effectively suppressed through random modulation of the brain medium. We use an established mesoscale cortical model in the form of a system of coupled stochastic partial differential equations. We show that by temporal and spatial randomization of parameters governing the firing rates of the excitatory and inhibitory neuron populations, seizure waves can be significantly suppressed. We find that the attenuation is the most effective when applied to the mean threshold potential. The proposed technique can serve as a non-invasive paradigm to mitigate epileptic seizures without knowing the location of the epileptic foci.

Effects of water on low-overpotential CO2 reduction in ionic liquid studied by sum-frequency generation spectroscopy

Adding water lowers the RTIL structural transition potential and the CO2 reduction threshold potential. Multiply-bonded CO is likely the more efficient catalytic site.