Recurrent neuro fuzzi controller power system stabilizer

Power system stabilizers (PSS) have been widely used to damp low frequency electromechanical oscillations which occur in power systems due to disturbances. If no adequate damping is available, the oscillation can increase and cause system separation. Power system stabilizers (PSS) are installed in power system generator to help the damping of power system oscillations. There are many approaches to enhance damping while extending the power stability limit. To improve power system stabilizer (PSS) design problem include optimal control ,adaptive and self-tuning control, PID control, robust control, variable structure control and intelligent control. In this paper the power stabilizer is based on Recurrent Neuro-fuzzy Inference System (RNFIS) design controller. In order to test the robustness of the proposed design procedure of the (RNFIS), simulations will be carried out for the three-phase to ground fault and 1- phase fault at the middle of one of the transmission line. After these simulations, we will compare the result between a lead-lag and recurrent neuro-fuzzy controllers to see their difference in disturbances. The optimal solutions will be compared where the expected result will show that the oscillations in time response of the machine speed and the rotor angle is damped more effectively when the recurrent neuro-fuzzy controller and applied to the system

Employee Well-Being During COVID-19 Pandemic: The Role of Adaptability, Work-Family Conflict, and Organizational Response

Well-being has always been a topic of interest for individuals, organizations, and policy-makers. COVID-19 pandemic made it tremendously relevant as employees were forced to work from home due to the successive lockdowns that governments have implemented to curb the spread of the virus. This crisis has raised concerns about employees’ well-being due to the implementation of these tight measures. In the present study, we examined the direct and indirect effects of employees’ adaptability, work-family conflict, and organizational response on employees’ well-being through the mediating role of perceived stress. Data have been collected from 184 employees working in various organizations in Malaysia and analyzed using Smart-PLS Structural Equation Modeling with the bootstrapping procedure. The results indicated that organizational response, work-family conflict, and adaptability directly affect perceived stress and well-being, except for organizational response, which has no direct effect on well-being. Furthermore, it was found that perceived stress mediates the relationship of organizational response and work-family conflict with well-being but not adaptability

Formulation and evaluation of piroxicam suppositories

Piroxicam suppositories were prepared by using water soluble and oil soluble suppository bases. All the prepared suppositories were evaluated for various physical parameters like weight variation, drug content and hardness, melting point, disintegration and macromelting range. Invitro release study was performed USP type I apparatus using Sorensen's phosphate buffer pH 7.4 as dissolution media. The suppositories prepared with water soluble bases were within permissible range of all physical parameters. In vitro drug released from water soluble bases (hydrous PEG and anhydrous PEG) was greater than that from oil soluble bases.Keywords: Piroxicam; In vitro evaluation; Macromelting range; Water soluble bases; Suppositorie

The influence of doping with Ca and Mg in YBa2Cu3O7-δ ceramic

We have investigated the effect of partial substitution of Ca for Y and/or Mg for Cu on structural, compositional and magnetic properties in γBa 2 Cu 3 O 7-δ polycrystalline compounds. All prepared samples were found to be single phase with small fraction of Ba-secondary phases. Substitution by more than 2% of magnesium causes an increase of spurious phases. Energy Dispersive Spectroscopy (EDS) revealed that the distribution of Ca in the sample is quite homogenous. DC susceptibility measurements show that superconducting transition temperature Tc is reduced much more by Ca than Mg. Hysteresis loops reveal that magnetic irreversibility is decreased by Ca and Mg content. The deduced critical current density Jc does not follow the same variation. Ca alone reduces Jc for x=0.1 and x=0.2. Together with Ca, Mg compensates the reduction of Jc and increasing its content near the solubility limit gives higher Jc than in the undoped sample

Hypoxia inducible factor-1α accumulation in steatotic liver preservation: Role of nitric oxide

Open-Acces journal.-- et al.[Aim]: To examine the relevance of hypoxia inducible factor (HIF-1) and nitric oxide (NO) on the preservation of fatty liver against cold ischemia-reperfusion injury (IRI). Methods]: We used an isolated perfused rat liver model and we evaluated HIF-1α in steatotic and non-steatotic livers preserved for 24 h at 4°C in University of Wisconsin and IGL-1 solutions, and then subjected to 2 h of normothermic reperfusion. After normoxic reperfusion, liver enzymes, bile production, bromosulfophthalein clearance, as well as HIF-1α and NO [endothelial NO synthase (eNOS) activity and nitrites/nitrates] were also measured. Other factors associated with the higher susceptibility of steatotic livers to IRI, such as mitochondrial damage and vascular resistance were evaluated. [Results]: A significant increase in HIF-1α was found in steatotic and non-steatotic livers preserved in IGL-1 after cold storage. Livers preserved in IGL-1 showed a significant attenuation of liver injury and improvement in liver function parameters. These benefits were enhanced by the addition of trimetazidine (an antiischemic drug), which induces NO and eNOS activation, to IGL-1 solution. In normoxic reperfusion, the presence of NO favors HIF-1α accumulation, promoting also the activation of other cytoprotective genes, such as hemeoxygenase- 1. [Concluison]: We found evidence for the role of the HIF-1α/NO system in fatty liver preservation, especially when IGL-1 solution is used. © 2010 Baishideng.Supported by The Ministerio de de Sanidad y Consumo (PI 081988), CIBER-EHD, Instituto Carlos III, Madrid and Ministerio de Asuntos Exteriores y de Cooperación Internacionales (A/020255/08 and A/02987/09), MadridPeer Reviewe

Traitement de l’incontinence urinaire post-opératoire de l’homme par bandelette sous urétrale: A propos de 16 cas

Objectif: Evaluer les résultats préliminaires de la mise en place d’une bandelette sous urétrale pour le traitement d’incontinence urinaire suite à une chirurgie prostatique chez l’homme selon la technique de Comiter modifiée (sans vissage osseux). Patients et méthodes: Entre janvier 2005 et décembre 2006, 16 patients ont été pris en charge pour incontinence urinaire qui apparut après chirurgie prostatique. Une bandelette de polypropylène fixée sur le périoste des branches ischio-pubiennes par des fils de nylon et comprimant l’urètre bulbaire a été mise en place. L’évaluation pré et post-opératoire a été basée sur l’examen clinique et le nombre de protections utilisées par jour. Les patients ont été revus à un mois post-opératoire, puis tous les trois mois. Résultats: Avec un recul moyen de 18 mois, 11 patients sont continents ne nécessitant pas deprotection et 3 patients sont nettement améliorés. Un échec a été noté chez un patient qui avait présenté initialement une incontinence sévère. Un autre patient a développé une infection de la bandelette nécessitant son retrait et a été exclus de la série pour l’évaluation fonctionnelle. Nousn’avons pas constaté de douleurs périnéales persistantes ni d’érosion urétrale ni d’ostéite. Conclusion: Notre modification de la technique selon Comiter semble avoir des résultats satisfaisants comparables avec la technique originale. Elle présente un avantage économique certain par rapport à d’autres kits du marché

Visualization of Distributed Algorithms Based on Graph Relabelling Systems1 1This work has been supported by the European TMR research network GETGRATS, and by the “Conseil Régional d' Aquitane”.

AbstractIn this paper, we present a uniform approach to simulate and visualize distributed algorithms encoded by graph relabelling systems. In particular, we use the distributed applications of local relabelling rules to automatically display the execution of the whole distributed algorithm. We have developed a Java prototype tool for implementing and visualizing distributed algorithms. We illustrate the different aspects of our framework using various distributed algorithms including election and spanning trees