Genetic Algorithm Based Control System Design of a Self-Excited Induction Generator

This paper presents an application of the genetic algorithm (GA) for optimizing controller gains of the Self-Excited Induction Generator (SEIG) driven by the Wind Energy Conversion Scheme (WECS). The proposed genetic algorithm is introduced to adapt the integral gains of the conventional controllers of the active and reactive control loop of the system under study, where GA calculates the optimum value for the gains of the variables based on the best dynamic performance and a domain search of the integral gains. The proposed genetic algorithm is used to regulate the terminal voltage or reactive power control, by adjusting the self excitation, and to control the mechanical input power or active power control by adapting the blade angle of WECS, in order to adjust the stator frequency. The GA is used for optimizing these gains, for an active and reactive power loop, by solving the related optimization problem. The simulation results show a better dynamic performance using the GA than using the conventional PI controller for active and reactive control

Synthesis, Biological activity and Mass Spectral Fragmentation Patterns of some New Fused Phthalazine-1,4-dione Derivatives

1,2,4-Triazino[1,2-b]phthalazine-6,11-dione (3) and 1,2,4-triazino[1,2-b]phthalazine-5,10-dione (4) were prepared via the reaction of 2-aminothiocarbonylphthalazine-1,4-dione with ethyl chloropropionate and ethyl chloroacetate.Acetylation of 4 with Ac2O gave the corresponding monoacetylderivative (5), while the acetylation of 4 with Ac2O in the presence of AcONa gave the corresponding diacetyl derivative (6). Treatment of 4 with bromine in AcOH and aromatic aldehydes afforded the corresponding 3-substituted-1,2,4-triazino[1,2-b]phthalazine-5,10-diones (7 and 8). The electron impact mass spectra of both of the above series of compounds have also been recorded and theirfragmentation pattern is discussed

A multilabel classification approach for complex human activities using a combination of emerging patterns and fuzzy sets

In our daily lives, humans perform different Activities of Daily Living (ADL), such as cooking, and studying. According to the nature of humans, they perform these activities in a sequential/simple or an overlapping/complex scenario. Many research attempts addressed simple activity recognition, but complex activity recognition is still a challenging issue. Recognition of complex activities is a multilabel classification problem, such that a test instance is assigned to a multiple overlapping activities. Existing data-driven techniques for complex activity recognition can recognize a maximum number of two overlapping activities and require a training dataset of complex (i.e. multilabel) activities. In this paper, we propose a multilabel classification approach for complex activity recognition using a combination of Emerging Patterns and Fuzzy Sets. In our approach, we require a training dataset of only simple (i.e. single-label) activities. First, we use a pattern mining technique to extract discriminative features called Strong Jumping Emerging Patterns (SJEPs) that exclusively represent each activity. Then, our scoring function takes SJEPs and fuzzy membership values of incoming sensor data and outputs the activity label(s). We validate our approach using two different dataset. Experimental results demonstrate the efficiency and superiority of our approach against other approaches

Učinak opuštanja na prekidačka svojstva tankih slojeva CuInSeTe

The switching properties of amorphous CuInSeTe thin films have been investigated. The amorphous quaternary semiconductor CuInSeTe thin films ∼ 220 nm and ∼ 330 nm thick have been prepared by thermal evaporation of the bulk compound under vacuum of about 10−4 Pa and with deposition rate about 8 nm/s. The structure of the bulk and thin films were investigated by the X-ray diffraction technique. The compositional studies of CuInSeTe in both powder and thin films were carried out by Perkin Elmer Model 1100 atomic absorption spectrometer. The annealing of the films at different annealing temperatures (300, 350, 400, 450 and 500 K) improves the switching characteristics and decrease the threshold voltage Vth. The threshold switching voltage and the threshold activation energy Es were found to decrease linearly with increasing annealing temperature. Moreover, the threshold switching voltage decreased exponentially with temperature.Istraživali smo prekidačka svojstva amorfnih tankih slojeva CuInSeTe. Tanke amorfne slojeve četiritvornog poluvodiča CuInSeTe debljine ∼ 220 nm i ∼ 330 nm pripremali smo naparavanjem spoja u vakuumu pri oko 10−4 Pa, brzinom naparavanja od oko 8 nm/s. Strukturu praha i tankih slojeva odredili smo rendgenskom difrakcijom. Sastav CuInSeTe u prahu i tankih slojeva ispitali smo pomoću Perkin Elmer-ovog (model 1100) apsorpcijskog spektrometra. Opuštanje tankih slojeva na nizu temperatura (300, 350, 400, 450 i 500 K) poboljšava njihova preklopna svojstva i smanjuje napon praga preklopnog napona Vth. Našli smo da se prag preklopnog napona i prag aktivacijske energije Es linearno smanjuju s povećanjem temperature opuštanja. K tome, prag preklopnog napona smanjuje se eksponencijalno s temperaturom opuštanja

Neurospora tetraspora D. Garcia, Stchigel & Guarro (= Gelasinospora tetrasperma Dowding) as a first record to Egypt

An interesting isolate of homothallic, ascosporic filamentous fungus having 4-spored asci, was recovered once from a non-rhizosphere soil sample collected from a grapevine plantation in the village of El-Khawaled, Sahel-Saleem city, Assiut. It was isolated on DYM agar plate at 25°C in June 2008. The isolate was identified phenotypically and genotypically as Neurospora tetraspora (= Gelasinospora tetrasperma) and was deposited in the culture collection of Assiut University Mycological Centre as AUMC no. 6784 and ITS gene sequence of the strain was deposited at the National Center for Biotechnology Information (NCBI) and assigned a GenBank accession number JQ425383. N. tetraspora is being recorded in the current work for the first time in Egypt. By this addition, the genus is now known in Egypt by four species. A key is provided for the four species. DOI: http://dx.doi.org/10.5281/zenodo.116560