Bouzekri A.,Ibn Khaldun University |
Allaoui T.,Ibn Khaldun University |
Denai M.,University of Hertfordshire
Journal of Electrical Engineering | Year: 2015
The integration of intermittent renewable energy sources into the electric grid presents some challenges in terms of power quality issues, voltage regulation and stability. Power quality relates to those factors which affect the variability of the voltage level and distortion of the voltage and current waveforms which can cause severe adverse effects to the electric grid. The paper focuses on the design and evaluation of a priority control strategy for improving the quality of energy of a grid-connected variable speed Doubly Fed Induction Generator (DFIG) wind energy conversion system. The aim of priority control is to manage the priority among three different controls: active stator power control; reactive stator power control and harmonic rotor current control by using the active shunt filter with SRF method harmonic compensation, and to have a high performance and robustness; an adaptive-fuzzy PI control are including for currents rotor control. The simulation model was developed in Matlab/Simulink environment. The results show that the proposed control scheme can effectively reduce the Total Harmonic Distortion (THD) in the grid currents.
Belarbi M.,University of Science and Technology of Oran |
Boudghene-Stambouli A.,University of Science and Technology of Oran |
Belarbi E.-H.,Ibn Khaldun University |
Haddouche K.,Ibn Khaldun University
Turkish Journal of Electrical Engineering and Computer Sciences | Year: 2016
In this paper, we present a new approach for estimating the one-diode model parameters of a photovoltaic solar panel according to the irradiance and temperature. These parameters are given, at a known irradiance and temperature, from the knowledge of three operating points: short circuit, open circuit, and maximum power. In the first step, the adopted approach concerns the resolution of the system of equations constituting the three operating points to write all the model parameters according to series resistance. Secondly, we make an iterative resolution at the optimal operating point by using the Newton-Raphson method to calculate the series resistance value as well as the model parameters. Once the last ones are identified, we consider other equations for taking into account the irradiance and temperature effect. The simulation results show the convergence speed of the model parameters and the possibility of visualizing the electrical behavior of the panel according to the irradiance and temperature. With the identified model, we can develop algorithms of maximum power point tracking and make simulations of PV systems. © Tubitak.
Setiawan F.A.,University of Indonesia |
Wibowo W.C.,University of Indonesia |
Ginting N.B.,Ibn Khaldun University
Communications in Computer and Information Science | Year: 2015
Ontology is widely used to represent knowledge in many software applications. By default, ontology languages such as OWL and RDF is built on discrete logic, so that it can not handle uncertain information about a domain. Various approaches have been made to represent uncertainty in ontology, one of which with a Bayesian approach. Currently, there are four published approaches: BayesOWL or OntoBayes, Multi-Entity Bayesian Networks (MEBN), Probabil istic OWL (PR-OWL), and Dempster-Shafer Theory. This paper provides a comparative study on those approaches based on complexity, accuracy, ease of implementation, reasoning, and tools support. The study concluded that Baye-sOWL is the most recommended approach to handle uncertainty in ontology construction among others. © Springer-Verlag Berlin Heidelberg 2015.
Susetyo B.,Ibn Khaldun University |
Arifin H.S.,Ibn Khaldun University |
Machfud,Ibn Khaldun University |
Widiatmaka,Ibn Khaldun University |
Arifin N.H.S.,Ibn Khaldun University
Ecology, Environment and Conservation | Year: 2015
Riparian zones are globally dominated by illegal settlements leading to reduced green open space area (GOS) and negative ecological impacts. Several tree appraisal methods were implemented in many researches in the world, such as ISA formula-Texas, CTLA-USA, Burnley-Australia, Helliwell-UK, STEM-New Zealand and Norma Granada-Spain. Commonly, the methods considered the basic value, species of tree, condition and location aspect of the tree. The main objective of this research is to evaluate trees value around the Ciliwung riparian area. The current research is a case study of the Ciliwung riparian area of Bogor City, Indonesia. Tree appraisal method in this research is ISTEM (International Shading Tree Evaluation Method), as the modification of ISA formula. The total researched area was approximately 303.84 ha, which consisted of a buffer area of 200 meters on either side of the river up to a distance of 15.19 km from the Ciliwung River, limited to Bogor City. The land cover consisted of a settlement area of 58% and a GOS area of 42%. Potential trees were evaluated using the standard sampling plot method with three repetitions of each type of structure (i.e. rare, moderate and dense areas) depending on the density of building (settlement) and density of standing trees (GOS). The percentage of standing trees area in the settlement were; rare area 12% of total settlement area, moderate area 17%, and dense area 30%, while in the GOS the values were rare area 8% of total GOS area, moderate area 16%, and dense area 8%. Total tree values for 2014 were calculated to be US$16.791.234. Current dynamic model was designed to estimate the projected trees value until the year 2030. Three scenarios developed resulted in trees yield value of U.S.$64,706,109 (optimistic); U.S.$78,556,923 (moderate), and U.S.$93,623,117 (pessimistic). The finding of research is implementation of trees appraisal model using ISTEM to predict the potential trees value in the river riparian through the urban area in Indonesia. Hence the model should serve as a tool for new regulations formulation of riparian management. © 2015 EM International.
Mohamed M.,Ibn Khaldun University |
Mokhtar A.,Ibn Khaldun University |
Dahbia Z.,Ibn Khaldun University |
Mohamed A.H.,Ibn Khaldun University
Arab Gulf Journal of Scientific Research | Year: 2013
The present work aimed at studying the possibility of decontaminating polluted soil by lead from traffic road, using Hordeum vulgare as a heavy metals hyperaccumulative plant. High concentrations of lead stored at the horizons of soil surface (1714.39 ± 512.62 μg g-1), have revealed that the traffic and road infrastructures are important outcomes of toxic heavy metals to the environment. In addition, we noticed that Hordeum vulgare may hold a total of 36.28 ± 14.90 μg g-1, which correspond to 2% of that to of that accumulated in the soil. Importantly, highest values were observed in the roots (18.32 ± 8.38 μg g-1), which means 50,50%, whereas, the rate of heavy metals in the stems and leaves were 10.83 ± 5.86 μg g-1 (29,95%) and 7.71±3.74 μg g-1 (21,25%), respectively. Otherwise, the accumulation of lead was influenced by physical and chemical properties of the soil (pH, cation-exchange capacity CEC, percentage of clay). A high content of lead was observed in the plant at low pH; in contrast, the CEC of the soil and the percentage of clay, positively correlated with plant Pb. However, a strong correlation between soil Pb and plant Pb was noticed. Accordingly, lead uptake by Hordeum vulgare seems to be influenced by its bioavailability in soil.
Ibn Khaldun University | Entity website
UIKA Electronic Journals System contains a collection of electronic journals published by departments of UniversitasIbn Khaldun Bogor. UIKA Electronic Journals System is expected to be a media to exchange data, information, and scientific knowledge in the fields of science including: religion, education, economics, law, engineering, and health ...
FAKULTAS TEKNIK Tentang pembangunan memberikan sebuah prospek bagi keberadaan lulusan teknik, sehingga fakultas teknikselaku salah satu penyedia SDM akan membekali para lulusannya dengan lmu-ilmu keteknikan yang sesuai dengan kebutuhan dunia kerja. PROGRAM STUDI Teknik sipil (S1) Teknik mesin (S1) Pilihan peminatan: Konstruksi dan manufaktur Konversi energy Teknik elektro (S1) Teknik informatika Pilihan peminatan: Rekayasa perangkat lunak Jaringan Peminatan kelas: Dibuka 2 program peminatan kelas, yaitu: Program kelas regular, pkl ...
PubMed | Ibn Khaldun University
Type: Journal Article | Journal: Recent patents on inflammation & allergy drug discovery | Year: 2011
Topical application of honey to burn and wounds has been found to be effective in controlling infection and producing a clean granulating bed. It is suggested that the wound healing effect of honey may in part be related to the release of inflammatory cytokines from surrounding tissue cells, mainly monocytes and macrophages. It has been reported that honey hastens wound healing by accelerating wound contractions. Microscopic evaluation demonstrated that there was a significant acceleration of dermal repair in wound treated with honey. Macroscopic and microscopic observations under in vivo assessment suggested that the topical application of honey might have favourable influences on the various phases of burn and wound healing hence accelerating the healing process. The regulatory effects of honey are related to components other than the sugars. However, the mechanisms by which honey affects the release of anti inflammatory agents and growth factors from monocytic cells are as yet unclear. Whether honey affects other cell types, particularly endothelial cells and fibroblasts, involved in wound healing also needs to be clarified. The present article is a short review of recent patents on the healing effect of honey in wound and burn management.