Artificial intelligence is developing in recent years as one of the emerging technologies that will revolutionize the way in which human beings live. This technology is already being introduced in the field of higher education and many teachers are unaware of its scope and above all, what it consists of. Therefore, the objective of this work has been to analyse the impact that artificial intelligence is having in higher education reflected in the most relevant scientific literature during the last 10 years (2007-2017). For this, it has been followed a bibliometric methodological strategy in the most relevant databases, focusing on 7 variables based on previous studies. Among the results stands out the worldwide interest in the topic and the last years of production, where there is a stagnation in 2017. Finally, after the analysis of the data it is found that although artificial intelligence is a reality, there is still a long way to go to fully establish itself in higher education.
Smart Grid (SG) is regarded as complex electrical power system due to massive integration of Renewable Energy Resources and Distribution Generations. The implementation of adjustable speed drives, advance power electronic devices, and electric arc furnaces are incorporated in SG (the transition from conventional power system). Digital Signal Processing (DSP) is key tool for SG deployment and provides key solutions to a vast array of complex SG challenges. This Survey provides a comprehensive study on DSP interactions within SG. The prominent challenges posed by conventional grid, such as: (a) monitoring and control, (b) Electric Vehicles infrastructure, (c) cyber data injection attack, (d) Demand Response management, (e) cyber data injection attack, (f) voltage unbalance, (g) over- and inrush-currents, (h) frequency drifts, (i) islanded detection, and (j) Power Quality (PQ) are thoroughly investigated in this survey. We provided brief overview of: (a) performance degradation of electrical parameters without DSP, (b) critical analysis of recently developed methodologies, and (c) main techniques applied to SG. Further, we investigated Digital Filters (DFs) and their algorithms for: (a) optimized performance, (b) PQ enhancement, (c) DSP schemes to control power disturbances, and (d) islanding detection. Finally, the survey critically analyses the effects of harmonics on PQ within SG.
This report acquaints the reader with extra two new shear-horizontal surface acoustic waves (SH-SAWs). These new SH-SAWs can propagate along the free surface of the transversely isotropic (6 mm) magnetoelectroelastics. These (composite) materials can simultaneously possess the piezoelectric, piezomagnetic, and magnetoelectric effects. Some competition among these effects can lead to suitable solutions found for three possible coupling mechanisms: , , . Here, the mechanically free solid-vacuum interface was treated. This report discovers the twelfth (thirteenth) new SH-SAW for the magnetically closed (electrically open) case and continuity of both the normal component of the electrical (magnetic) displacement and the electrical (magnetic) potential when ( ) works. The propagation velocities were obtained in explicit forms with contribution of the vacuum material parameters. The discovered waves were then graphically studied for the purpose of disclosing the dissipation phenomenon (the propagation velocity becomes imaginary) caused by the coupling with the vacuum properties. The obtained results can be useful for further investigations of interfacial (plate) SH-waves, constitution of technical devices, nondestructive testing and evaluation, and application of some gravitational phenomena.
This study focuses on the study of the compartment of the synchronous inductor machine with variable speed, fed by a three-phase inverter. Several transients were treated by simulation (start unloading, introducing a torque load, reversing and speed change). Then engine cushion at both loss and when starting without the damper. In addition, robustness tests on the parametric variation of (MSRB) were also performed. Based on the results of simulations, the control technique studied makes it possible to obtain good dynamic and static performances and has a robustness with respect to the external perturbation and the parametric variation.
In this study, the hydrogen concentration distribution along the depth direction of the hydrogen-charged specimens was analyzed, and the results were compared among the three different hydrogen sulfide concentrations and four different corrosion periods. Moreover, the hydrogen concentration distribution along the depth direction of the hydrogen-charged specimens was calculated using the model based on Fick\'s second law. The depth variations of experimental hydrogen concentration distribution and theoretical value were compared with various corrosion periods. Hydrogen saturated value and hydrogen saturated layer (HSL) of specimens were obtained, and the thickness of HSL increased as the corrosion period increased in metals.
In April 2017, the Russian Government announced that it had completed its new military bases in the Arctic and had completed most of the work on restoring several military bases in the region which had been abandoned. Russia is demonstrating its military potential in the Arctic Region and has repaired and replaced former port and military installations along its Arctic coast and developed new air bases on islands in the Arctic Seas
Rapid development of resistance to existing antimalarial drugs stresses the need to find new antimalarials. Although various important biological activities of starfishes were reported, their antimalarial potential was not yet explored. This study investigates the antiplasmodial potential of Archaster typicus Müller & Troschel (Archasteridae), Culcita novaeguineae Müller & Troschel (Oreasteridae) and Linckia laevigata Linn. (Ophidiasteridae). Three ethanol extracts of starfishes (1-100 μg/mL) were evaluated for in vitro antimalarial activity against chloroquine sensitive (3D7) and resistant (Dd2) strain of Plasmodium falciparum strain in a 24 h schizont maturation assay. L. laevigata was further subjected to chromatographic analysis to isolate bioactive components. Cytotoxicity of the extracts and the isolated constituents (1-200 μg/mL) was measured against human cervical cancer cell line (HeLa) and rat skeletal muscle cell line (L6) using MTT assay. L. laevigata extract showed highest antiplasmodial activity (IC50 36.17 and 47.66 μg/mL) against 3D7 and Dd2 strains of P. falciparum respectively. A. typicus (IC50 49.05 and 61.76 μg/mL) and C. novaeguineae (IC50 43.78 and 56.03 μg/mL) showed moderate activity. Based on bioassay results, L. laevigata was studied further and β-sitosterol (IC50 4.55 and 10.74 μg/mL), batilol (IC50 6.39 and 9.88 μg/mL), and 3-methylbenzene-1,2,4,5-tetrol (IC50 4.81 and 11.35) were isolated for the first time from this species. The compounds showed cytotoxicity against the HeLa and L6 cells with IC50 in the range of 20.67 to 67.34 μg/mL. L. laevigata emerged as a promising candidate for antimalarial treatment.