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

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

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

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

Plasma Β-Endorphin and Cortisol Profiles around Periparturient Period at Stressful Conditions in Egyptian Buffalo

The study determined the level of plasma β-endorphin and cortisol concentrations in peripheral blood circulation of buffalo cows suffering from reproductive disorders (dystocia and retained placenta) and weakness body condition score during periparturient period. Twenty multi-parous Egyptian buffalo cows at late pregnancy period were used for two months before parturition. β-endorphin concentrations were higher in buffalo suffering from reproductive disorders groups. Whereas, β-endorphin concentrations were 134.9±4.8 for retained placenta, 121.3±4.9 for dystocia, 114.2±8.4 for weakness and 113.5±6.5 pg/ml for control. In the closer period around parturition both of plasma β-endorphin and cortisol followed the same trend toward a gradually increased values during -2,-1days and zero time in all groups. A concomitant trend was noticed in β-endorphin and cortisol concentrations in postpartum period with reduce values were observed in all groups after parturition continued for month or more. Buffalo suffering from reproductive disorders were showed a high relative values in β-endorphin and cortisol concentrations. A significant differences (P<0.01) were observed between the experimental groups. Generally, buffaloes suffering reproductive disorders had a clear impact on blood plasma β-endorphin concentration around parturition process.The aim of this study was to determine the relationship between various reproductive disorders as a stress factors with plasma β–endorphin and cortisol in buffalo cows around parturition and changes in these parameters could be used as an objective measure of the stress associated labour. Stress has been hypothesized to be a cause of impaired reproductive efficiency. Stress may cause an overproduction of beta-endorphins and free radical

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

962-96

Quality Function Deployment (QFD): A Method for Improving Concrete Characteristics Made From Recycled Aggregate Concrete (RAC)

This study aims at developing a procedure for integrating the Quality Function Deployment (QFD) method as an effective design tool into recycled concrete ready mix concrete industry improvement; design, and prioritizing Engineering characteristic for concrete mix. The significance of this work lies in its attempt to provide some performance data of Recycle aggregate Concrete (RAC) made in Gaza Strip so as to draw attention to possible use of Recycled Concrete Aggregate (RCA) in ready mix concrete industry. This work is limited to the development of a suitable concrete mix design that satisfies the requirements of mix proportion in the plastic stage using Recycled Concrete Aggregates (RCA) and then to determine the strength and permeability of such concrete mix when exposed to stressing at different ages: 7, 28 for compressive strength, 28 days for flexure, split strength and 120 days for water penetrations. Moreover, it involves a comparative study of the strength and permeability of four concrete mixtures at various water cement ratio and Traditional Mix Approach (TMA) and Two Stage Mix Approach (TSMA) to specify which the best mix fit on economical and technical requirements. During the mix design, Quality Function Deployment (QFD) identified which components were the most critical to fulfilling customer requirements. As the products cost is analyzed, the QFD analysis could be used to support decisions to require a higher level of quality, and therefore a higher cost per unit quantity, for certain components. The biggest benefit of QFD analysis occurs when integrated into the mix design. As the final design is completed and refined, critical RAC specifications were made more stringent to reduce or eliminate the failure concrete sample. In practice, four replacement ratios (0.00, 030, 0.50, and 0.70) of the recycled aggregate, reduction of water cement ratio from 0.55-to-0.45-to-0.35 and cement content (330 kg/m3, 350 kg/m3 and 380 kg/m3) were considered to determine their effects on the improvement physical properties of the RAC and to obtain an acceptable quality of concrete with maximum utilization of recycled aggregate in place of natural aggregate using TMA,159 samples were prepared and measurements of compressive strength, splitting strength, flexure strength at 28days. In addition, the mix method was refined using TSMA with the same conditions and construct 135 samples and avoiding 30% replacement for water depth penetration test because it was not achieve economical requirements. Due to the laboratory test which is performed to ensure and prove the developmental shift on workability, strength and permeability of new concrete mix (RCA mix), it can be clearly seen that the permeability and the strength of the RCA concrete is very dependent on the properties of the RCA aggregate, percent substitutions, w/c and mixing method. According to the results of this study, concrete incorporating very well graded RCA replacing 50% of NCA and with accepted properties showed satisfactory results regarding water permeability and strength comparing with those of the standard concrete mixes, and consequently, it is recommended that the RCA concrete according to the final design proportions (with RCA replacing 50% of NCA) can be used as a sustainable material in structural applications and produced concrete structure grade B250- B300-B350 at w/c 045, 0.45 and 0.35 respectively, and can be widely used in construction works with optimum cost and water depth penetration less than 3cm (low permeability) due to using TSMA

Quality of Care Assessment and Adherence to the International Guidelines Considering Dialysis, Water Treatment and Protection Against Transmission of Infections in University Hospital Based Dialysis Unit in Cairo, Egypt

Abstract Background: End stage Renal Disease (ESRD) has emerged as a major public health problem around the world. In recent decades, several important advances have been made in the therapy of hemodialysis (HD) with introduction of international guidelines to ensure the delivery of optimum care to HD patients. Increased mortality risk in HD patients unable to meet six targets in different areas of HD practice has been reported by the DOPPS investigators

Prevalence and antimicrobial sensitivity of Escherichia coli and Salmonella species in field cases of rabbit intestinal coccidiosis treated with prebiotic

This study aimed to investigate the effect of prebiotic treatment on E. coli and Salmonella species during natural intestinal coccidiosis in rabbits. The experiment was conducted on 45 selected farm rabbits of which 15 were coccidian free (Negative control; NC, group) and 30 were naturally coccidian infected. The infected animals were allocated into two equal groups including positive control (PC) and prebiotic treated (PT) that were orally treated with prebiotic for 8 successive days. Fecal oocyst count was assessed daily during the course of treatment. Meanwhile, the PC group had a significantly high oocyst count (21.67×103 ± 0.82 OPG), with a significant increase in the prevalence of E. coli and Salmonella (86.7 % and 46.7 %, respectively). Moreover, the NC group remained coccidian free and exhibited E. coli infection only with no detection of salmonella isolates. Findings of in-vitro susceptibility testing showed that E. coli isolates were highly resistant to most of the tested antimicrobials while Salmonella isolates showed variable degrees of resistance. In conclusion, the prebiotic treatment significantly reduced the prevalence of E. coli and Salmonella infections coexisted with intestinal coccidiosis in naturally infected rabbits