Reliability assessment for electrical power generation system based on advanced Markov process combined with blocks diagram

This paper presents the power generation system reliability assessment using an advanced Markov process combined with blocks diagram technique. The effectiveness of the suggested methodology is based on HL-I of IEEE_EPS_24_bus. The proposed method achieved the generation reliability and availability of an electrical power system using the Markov chain which based on the operational transition from state to state which represented in matrix. The proposed methodology has been presented for reliability performance evaluation of IEEE_EPS_24_bus. MATLAB code is developed using Markov chain construction. The transition between probability states is represented using changing the failure and repair rates. The reduced number of generation system are used with Markov process to assess the availability, unavailability, and reliability for the generation system. Additionally, the proposed technique calculates the frequency, time duration of states, the probability of generation capacity state which get out of service or remained in service for each state of failure, and reliability indices. A considerable improvement in reliability indices is found with using blocks diagram technique which is used to reduce the infinity number of transition states and assess the system reliability. The proposed technique succeeded at achieving accurate and faster reliability for the power system

An expert system for nausea and vomiting problems in infants and children

Infants and children are suffering from a lots of nausea and vomiting problems. Doctors, usually face various difficulties dealing with these problems because of their similarities. In this paper, we present an expert system to help users in getting the correct diagnosis of problems of nausea and vomiting in infants and children (Gastro-esophageal reflux, Gastroenteritis, Systemic Infection, Bowel obstruction, Tumors, A bleeding disease, tonsillitis, and Hepatitis pharynx). Furthermore, this expert system provide information about the disease and how to deal with it. SL5 Object expert system language was used to design and implement this expert system

Interactions of lipid monolayers with the natural biopolymer hyaluronic acid

AbstractThe interaction of the natural mucopolysaccharide hyaluronic acid with different lipids, present in the natural membranes, was studied at the lipid/water interface using thermodynamic methods and X-ray diffraction. The results show that this biopolymer modifies the properties and the structure of the lipid monolayer. The two-dimensional crystalline lattice and domain structure of the charged octadecylamine monolayer are strongly disturbed by the hyaluronic acid, the monolayer compressibility increases and the monolayer collapse pressure drops down. In addition, the presence of charged lipid interfaces influences the structural organisation of the hyaluronic acid at the membrane/water interfaces. The impacts of these results on the structural organisation at the membrane interface are discussed

On the Geometry of Equiform Normal Curves in the Galilean Space G4

In our article, we establish the definition of the Equiform Normal curves in Galilean space G4. To obtain the position vector of an Equiform Normal curve in G4, we have to solve an integro-differential equation in μ2, where μ2 is the position function of a space curve γ (σ ) in the direction of third vector V3 of the Galilean space. Special cases of Equiform Normal curvatures are discussed. Finally, we prove that there is no equiform normal curve that is congruent to an Equiform Normal curve in G4

La rhodophycée Gelidium spinosum (S.G. Gmelin) P.C. Silva, des côtes de Monastir (Tunisie) : quelques éléments hydrobiologiques et potentialités en agar-agar

La rhodophycée Gelidium spinosum (S.G. Gmelin) P.C. Silva (Rhodophycées ; Gélidiales) a été étudiée pendant une année, depuis septembre 2000 jusqu’à août 2001, sur la côte de Monastir (Est de la Tunisie). Les résultats globaux obtenus montrent que le poids humide maximum (environ 37 g/individu) a été atteint en mai. La longueur maximale (environ 11 cm) a été enregistrée en juin. La biomasse maximale en poids humide (environ 7000 g/m2) a été obtenue en mai. Quant à la fertilité, elle a varié entre 0%(Mai) et 100% (Septembre, Juin, Juillet et Août). Concernant le rendement en agar, le maximum a été obtenu en avril (33.4 % du poids sec), La force de gel maximale a atteint environ 705 g.cm-² (juin). Le point de gélification et le point de fusion les plus élevés ont été obtenus respectivement en août (34.33°C) et septembre (94.33°C).Mots-clés : Gelidium spinosum, poids, longueur, biomasse, fertilité, agar-agar

Extraction and characterization of chitin and chitosan from crustacean by-products: Biological and physicochemical properties

Chitin has been extracted from two Tunisian crustacean species. The obtained chitin was transformed into the more useful soluble chitosan. These products were characterized by their biological activity as antimicrobial and antifungal properties. The tested bacterial strains were Escherichia coli American Type Cell Culture (ATCC) 25922, Pseudomonas aeruginosa ATCC 27950 and Staphylococcus aureus ATCC 25923. Four fungi strains were also tested Candida glabrata, Candida albicans, Candidaparapsilensis and Candida kreusei. Squilla chitosan showed a minimum inhibitory concentration (MIC) against the different fungi exceptionally for C. kreusei. Their antioxidant activity was investigated with 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity and inhibition of linoleic acid peroxidation. Parapenaeus longirostris Chitosan showed the highest radical scavenging properties. Chitin and chitosan produced were also characterized with Fourier Transform Infrared Spectroscopy (FTIR).Key words: Antibacterial, antifungal, antioxidant, chitin, chitosan, crustacean

Spectral Studies on Some Hydrazones of 6-Formyl-7-hydroxy-5-methoxy-2-methylchromone

962-96

Effect of Dietary Protein and Metabolizable Energy Levels on Growth and Feed Utilization of Sea Bass (Decentrarshus laborax) Larvae

ABSTRACT Three dietary protein levels (25, 35 and 45%) and two dietary metabolizable energy levels (250 and 300 kcal/100g diet) at a 3×2 factorial experiment were combined to study their effects on growth performance, body composition and feed utilization of sea bass (Decentrarshus laborax) larvae. The larvae had initial body weight of 0.8 g. In glass aquaria this experiment lasted for five weeks. Fish were fed 3 times daily to satiation 7 days per week with changing water daily by freshly stocked brackish water (15ppt) and continuous aeration. Fish were weighed every two weeks. Weight gain of sea bass increased significantly with increasing dietary crude protein level up to 45% and decreased significant with increasing energy levels from 250 and 300 kcal/100 g diets. Feed conversion ratio (FCR) improved with increasing dietary crude protein level up to 45% and no differences were found between 250 and 300 kcal/100g diets. Protein and lipid content of sea bass larvae increased significantly with increasing dietary crude protein level from 25% to 45%. Also, lipid content of sea bass larvae increased with increasing dietary energy level from 250 to 300 kcal/100 g diets, but, protein content decreased. The best SGR was observed with 45% dietary crude protein with 250 kcal/100g diet. Final body weight (FBW) of sea bass increased significantly (P<0.05) with increasing dietary crude protein level up to 45% with 250 kcal/100 g diets. ER% increased significantly (P<0.05) with increasing dietary crude protein level, but it decreased with increasing energy level. This result indicates that the best protein and energy levels for sea bass larvae (0.8 g BW) growth are 45% and 250 kcal, respectively. Lower protein level has given better protein utilization and a protein sparing effect but tended to result in reduced weight gain and feed intake, when compared with diet containing higher protein level at 45%