Recent Advances in Graphene Oxide-Based Anticorrosive Coatings: An Overview

The present review outlines the most recent advance in the field of anticorrosive coatings based on graphene oxide nanostructures as active filler. This carbonaceous material was extensively used in the last few years due to its remarkable assets and proved to have a significant contribution to composite materials. Concerning the graphene-based coatings, the synthesis methods, protective function, anticorrosion mechanism, feasible problems, and some methods to improve the overall properties were highlighted. Regarding the contribution of the nanostructure used to improve the capability of the material, several modification strategies for graphene oxide along with the synergistic effect exhibited when functionalized with other compounds were mainly discussed

BRAIN Journal - Optimization of Distributed Systems Using Multi-Agent Systems with Virtual Time

<div><i>Abstract</i></div><div><br></div><div>The fusion of Artificial Intelligence and Real Time areas has proven to be quite a clever movement, similar to the movement associated to check in chess (lets not go that far as checkmate, considering that the area of Informatics is quite slippery when it comes to updates). Artificial Intelligence provides new possibilities to the Real-Time systems. However, this approach has shown important difficulties.[2]</div><div>Mainly, the Real-Time systems have temporal requirements (they usually require predictable response times) that are not usual in Artificial Intelligence techniques. One of the ways to solve this problem is the development of software architectures. These software architectures are used to design intelligent agents that work in real-time environments. These architectures have several mechanisms to allow the agents to work in real time environments offering reactive behavior (to fulfil the temporal requirements) and deliberative behavior. [2]</div><div>However, in Distributed Systems, although the notion of global time plays an important role, it is hard to realize; at first sight even the definition of the very term itself is not clear at all. This paper is an extended work of [6]</div><div><br></div><div><b>Find more at:</b></div><div><b>https://www.edusoft.ro/brain/index.php/brain/article/view/21</b><br></div

PointProNets: Consolidation of Point Clouds with Convolutional Neural Networks

ISSN:1467-8659ISSN:0167-705

BRAIN Journal - Optimization of Distributed Systems Using Multi-Agent Systems with Virtual Time - Figure 1. Cristian’s Algorithm

<div>Cristian’s Algorithm (figure 1) is a method for clock synchronization which can be used in</div><div>many fields of distributive computer science. It suffers, though, in implementations using a single</div><div>server, making it unsuitable for many distributive applications where redundancy may be crucial.</div

BRAIN Journal - Optimization of Distributed Systems Using Multi-Agent Systems with Virtual Time - Figure 3. The multi-agent system

<div>Thus, we would deal with a ZERO AGENT and several groups of agents. Such a group is</div><div>made up of several agents, each and one of these agents accomplishing a certain role in the process</div><div>of synchronization (figure 3).</div

BRAIN. Broad Research in Artificial Intelligence and Neuroscience-Optimization of Distributed Systems Using Multi-Agent Systems with Virtual Time-Figure 2. Lamport’s algorithm

Figure 2. Lamport’s algorithm<div><br></div><div>In order to synchronize logical clocks, Lamport [3] defined the relationship “happened before” (preceded) which implies that the expression 1 2 a → a means “ 1 a occurred before 2 a ”, and it means that all the processes coincide in the fact that 1 a took place first, and subsequently 2 a took place. This relation can be directly observed in two situations (figure 2): 1. If two events happen during the same process, the order of the happening is indicated by the common clock; 2. When two processes communicate through a message, the event that corresponds to sending the precise message always happens before the event of receiving it (i.e. the message). </div

Improving the Voltammetric Determination of Hg(II): A Comparison Between Ligand-Modified Glassy Carbon and Electrochemically Reduced Graphene Oxide Electrodes

A new thiosemicarbazone ligand was immobilized through a Cu(I)-catalyzed click reaction on the surface of glassy carbon (GC) and electrochemically reduced graphene oxide (GC-ERGO) electrodes grafted with phenylethynyl groups. Using the accumulation at open circuit followed by anodic stripping voltammetry, the modified electrodes showed a significant selectivity and sensibility for Hg(II) ions. A detection limit of 7 nM was achieved with the GC modified electrodes. Remarkably, GC-ERGO modified electrodes showed a significantly improved detection limit (0.8 nM), sensitivity, and linear range, which we attribute to an increased number of surface binding sites and better electron transfer properties. Both GC and GC-ERGO modified electrodes proved their applicability for the analysis of real water samples

Characterization and In Vitro and In Vivo Assessment of a Novel Cellulose Acetate-Coated Mg-Based Alloy for Orthopedic Applications

Despite their good biocompatibility and adequate mechanical behavior, the main limitation of Mg alloys might be their high degradation rates in a physiological environment. In this study, a novel Mg-based alloy exhibiting an elastic modulus E = 42 GPa, Mg-1Ca-0.2Mn-0.6Zr, was synthesized and thermo-mechanically processed. In order to improve its performance as a temporary bone implant, a coating based on cellulose acetate (CA) was realized by using the dipping method. The formation of the polymer coating was demonstrated by FT-IR, XPS, SEM and corrosion behavior comparative analyses of both uncoated and CA-coated alloys. The potentiodynamic polarization test revealed that the CA coating significantly improved the corrosion resistance of the Mg alloy. Using a series of in vitro and in vivo experiments, the biocompatibility of both groups of biomaterials was assessed. In vitro experiments demonstrated that the media containing their extracts showed good cytocompatibility on MC3T3-E1 pre-osteoblasts in terms of cell adhesion and spreading, viability, proliferation and osteogenic differentiation. In vivo studies conducted in rats revealed that the intramedullary coated implant for fixation of femur fracture was more efficient in inducing bone regeneration than the uncoated one. In this manner, the present study suggests that the CA-coated Mg-based alloy holds promise for orthopedic aplications

Band-Gap Engineering of Layered Perovskites by Cu Spacer Insertion as Photocatalysts for Depollution Reaction

A multi-step ion-exchange methodology was developed for the fabrication of Cu(LaTa2O7)2 lamellar architectures capable of wastewater depollution. The (001) diffraction line of RbLaTa2O7 depended on the guest species hosted by the starting material. SEM and TEM images confirmed the well-preserved lamellar structure for all intercalated layered perovskites. The UV–Vis, XPS, and photocurrent spectroscopies proved that Cu intercalation induces a red-shift band gap compared to the perovskite host. Moreover, the UV–Vis spectroscopy elucidated the copper ions environment in the Cu-modified layered perovskites. H2-TPR results confirmed that Cu species located on the surface are reduced at a lower temperature while those from the interlayer occur at higher temperature ranges. The photocatalytic degradation of phenol under simulated solar irradiation was used as a model reaction to assess the performances of the studied catalysts. Increased photocatalytic activity was observed for Cu-modified layered perovskites compared to RbLaTa2O7 pristine. This behavior resulted from the efficient separation of photogenerated charge carriers and light absorption induced by copper spacer insertion