Robust fuzzy PSS design using ABC

This paper presents an Artificial Bee Colony (ABC) algorithm to tune optimal rule-base of a Fuzzy Power System Stabilizer (FPSS) which leads to damp low frequency oscillation following disturbances in power systems. Thus, extraction of an appropriate set of rules or selection of an optimal set of rules from the set of possible rules is an important and essential step toward the design of any successful fuzzy logic controller. Consequently, in this paper, an ABC based rule generation method is proposed for automated fuzzy PSS design to improve power system stability and reduce the design effort. The effectiveness of the proposed method is demonstrated on a 3-machine 9-bus standard power system in comparison with the Genetic Algorithm based tuned FPSS under different loading condition through ITAE performance indices

Directional Control of a Platoon of Vehicles for Comfort Specification by Considering Parasitic Time Delays and Lags

The problem of controlling a string of vehicles moving in one dimension is considered so that they all follow a lead vehicle with a constant spacing between successive vehicles. This paper is concerned by considering both effect of the parasitic time delays and lags and comfort specification. The Contribution of this paper is two-fold. Firstly, most physical systems often involve parasitic time delays and lags. Due to practical design and implementation, the negative effect of the parasitic time delays and lags on the string stability be taken into account Secondly, the aim here, however, is specifically to consider the restrictions which need to be imposed on the control parameters, in order to be well-suited with bounds on the dynamic variables as well as the requirement for string stability. At the end the robustness against the noise in the measurement signals factors are studied

A Novel Topology Optimization Approach for Flow Power Loss Minimization Across Fin Arrays

Fin arrays are widely utilized in many engineering applications, such as heat exchangers and micro-post reactors, for higher level of fluid–solid contacts. However, high fluid pressure loss is reportedly the major drawback of fin arrays and a challenge for pumping supply, particularly at micro-scales. Previous studies also indicate that fin shapes, spacing and alignment play an important role on the overall pressure losses. Therefore, we present a numerical tool to minimize pressure losses, considering the geometrical aspects related to fin arrays. In this regard, a density-based topology optimization approach is developed based on the pseudo-spectral scheme and Brinkman penalization in 2D periodic domains. Discrete sensitives are derived analytically and computed at relatively low cost using a factorization technique. We study different test cases to demonstrate the flexibility, robustness and accuracy of the present tool. In-line and staggered arrays are considered at various Reynolds numbers and fluid–solid volume fractions. The optimal topologies interestingly indicate a pressure loss reduction of nearly compared to circular fins. In passive optimization test examples, the added solid parts reduced pressure loss of a circular fin ( ) by eliminating the flow separation and filling the wake region

Biostratigraphic Study of the Gurpi Formation Based on Planktonic Foraminifera In Lar Area (Kuh-e-kurdeh Section)

The study of planktonic foraminifera of the Gurpi formations at Lar area (Kuh-e-kurdeh section) enables me to find the most standard biozones defined in mediterranean regions, especially Tethysian domain. Five biozones were determined. Biozones I (Globotruncanita elevata zone) and II (Globotruncana ventricosa zone) and III (Radotruncana calcarata zone) indicate the Early Campanian and Middle and Late Campanian, respectively. Biozones IV (Globotruncanita stuarti zone) and V (Gansserina gansseri zone) suggest the Early and Middle Maastrichtian, respectively. In the Late Maastrichtian, due to decreasing in water depth at the study area, Abathomphalus mayaroensis zone defined in Tethysian domain was not recognised.

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Nano-Micro Tubes & Fibers for Biomedical Applications

Polymer based nanometer to micrometer size fibers and tubes are the bases for a wide range of industrial and medical applications and various research branches. They are capable of guiding light, carrying electricity and liquid or exchanging heat. Two production systems were established and built. These systems enable us to produce a wide range of tiny tubes & fibers. Light, nano-micro tubes & fibers, beads, nanoparticles and biological entities and agents (e.g. cells, antibodies and nerve growth factor) were used in this master work. The main focus in this work is on nerve regenerative implants and neural electrodes

Topical Calcineurin Inhibitors: Expanding Indications for Corneal and Ocular Surface Inflammation

This is an Editorial and does not have an abstract

Stability Analysis of a Predecessor-Following Platoon of Vehicles With Two Time Delays

The problem of controlling a platoon of vehicles moving in one dimension is considered so that they all follow a lead vehicle with constant spacing between successive vehicles. The stability and the string stability of a platoon of vehicles with two independent and uncertain delays, one in the inter-vehicle distance and the other in the relative velocity information channels, are considered. The main objectives of this paper are: (1) using a simplifying factorization procedure and deploying the cluster treatment of characteristic roots (CTCR) paradigm to obtain exact stability boundaries in the domain of the delays, and (2) for the purpose of disturbance attenuation, the string stability analysis is examined. Finally, a simulation example of multiple vehicle platoon control is used to demonstrate the effectiveness of the proposed method

Cistos de dinoflagelados do Paleoceno-Oligoceno do Anticlinal de Siah, Bacia de Zagros, sudoeste do Irã

A section of the Pabdeh Formation dating back to the Paleocene-Oligocene has been sampled in the Zagros Basin in Southwest Iran for palynological investigations and evaluation of thermal maturity and hydrocarbon generation potential. In total, 125 rock samples were collected and processed palynologically. The samples yielded rich assemblages of dinoflagellate cysts, and 65 cyst species were identified. Some index species allowed us age dating and establishment of seven dinoflagellate cyst zones in accordance with the existing European zonation. The dinoflagellate cyst zones allowed precise age assignment of the formation under study to late Paleocene to early Oligocene. For thermal maturity evaluation, spore and pollen grain color were correlated against the standard color chart prepared by the Shell Oil Company. The properties of the samples, according to palynomorph color changes, suggest that this formation is potentially oil prone and may have produced oil.Uma seção da Formação Pabdeh do Paleoceno-Oligoceno foi amostrada na Bacia Zagros, no sudoeste do Irã, para investigações palinológicas e avaliação de maturidade térmica e potencial de geração de hidrocarbonetos. Ao todo, 125 amostras de rochas foram coletadas e processadas palinologicamente. As amostras produziram assembleias ricas de cistos de dinoflagelados, nas quais foram identificadas 65 espécies de cistos. Algumas espécies-guia permitiram datação por meio do estabelecimento de sete biozonas de dinoflagelados de acordo com o arcabouço de biozoneamento europeu existente. As zonas de cistos de dinoflagelados permitiram atribuir a idade precisa da formação em estudo, a qual se estende do Neopaleoceno até o Eo-oligoceno. Para maturidade térmica, a coloração de esporos e grãos de pólen foi correlacionada com a escala padrão de cores da companhia de petróleo Shell. Propriedades das amostras, indicadas pela mudança de cor dos palinomorfos, sugerem que a formação é potencialmente geradora, podendo ter produzido petróleo