Research ArticleOpen accessIn the abstractFriction Forces in O-ring SealingAl-Ghathian, Faisal M.M. Tarawneh, S. MuafagIn the present study the focus was on developing a relationship as practical and convenient option for computing the friction force in O-ring sealing elements as used in the hydraulic and pneumatic equipments. For low-pressure applications, the developed relationship was applied for a different number of O-ring diameters, by investigating the obtained results, a good agreement has been observed for … …American Journal of Applied Sciences, Vol. 2, Issue 3 · 31 Mar 2005 · 8,465 accessesView PDFCite
Research ArticleOpen accessIn the abstractSynthesis, Characterization and Saponification of Poly (AN)-Starch Composites and Properties of their HydrogelsA. Hashem, M. A. Afifi, E. A. El-Alfy, A. HebeishHydrogels based on saponified products of poly (acrylonitrile, AN)-starch composites were prepared, characterized and their water abosrbency properties examined. The term composite refered to the resultant products of polymerizatin of AN with starch in presence of ceric ammonium nitrate (CAN) as initiator, that is the composite consists of poly(AN)-starch graft copolymer, homopoly(AN) , oxidized starch and unreacted starch. Thus AN … …American Journal of Applied Sciences, Vol. 2, Issue 3 · 31 Mar 2005 · 7,582 accessesView PDFCite
Research ArticleOpen accessIn the abstractThe Situation and Evaluation of Forest Harvesting Methods in TurkeyMurat Demir, Tolga OzturkThe present study summarize and evaluate major problems of timber harvesting in Turkey and the future principles and objectives have been defined. Timber harvesting in Turkey is still carried out by manual methods due to economical, social and environmental constraints. Almost 80% of harvesting activities are mechanized in many developed countries while this value is only 5% in Turkey. Overall … …American Journal of Applied Sciences, Vol. 2, Issue 2 · 28 Feb 2005 · 7,399 accessesView PDFCite
Research ArticleOpen accessIn the abstractDesign of Flywheel with a Moving HoleJihad Said AddasiA special apparatus has been designed to study linear, circular, and rotational motions. This apparatus consists of a flywheel, rotating in horizontal plane by the mean of a hanging mass. This flywheel carries a hole, which can be moved on a radial rail. This hole can be fixed at desired distance from the flywheel axis. Putting a metallic sphere on … …American Journal of Applied Sciences, Vol. 2, Issue 1 · 31 Jan 2005 · 6,890 accessesView PDFCite
Research ArticleOpen accessIn the abstractWork Performance of MB Trac 900 Tractor on Mountains Terrain in TurkeyTolga Ozturk, Murat DemirThe forestry works mainly involves such various stages as growing, protection, production, wood harvesting, marketing and utilization of forest products. Wood harvesting is performed by completion of cutting, extraction and transporting stages. The most obvious feature of wood harvesting is that the operations are done under various weather conditions open in the field. The measurements and observations were made on … …American Journal of Applied Sciences, Vol. 2, Issue 1 · 31 Jan 2005 · 7,317 accessesView PDFCite
Research ArticleOpen accessIn the abstractFeasibility of Continuous Flow Sequencing Batch Reactor in Domestic Wastewater TreatmentAmir Hossein Mahvi, A. R. Mesdaghinia, Farham KarakaniThe purpose of this study was to determine whether continuous flow SBR could provide efficient pollutant removal in domestic wastewater. The experiment was carried out using a pilot scale at Tehran University of Medical Sciences and in wastewater treatment plant. The results showed that 97.7% of BOD removal, 94.9% COD removal, 85.4% TKN removal, 71.4 % TN removal, 55.9% TP … …American Journal of Applied Sciences, Vol. 1, Issue 4 · 31 Dec 2004 · 7,770 accessesView PDFCite
Research ArticleOpen accessIn the abstractPotential of Rice Husk and Rice Husk Ash for Phenol Removal in Aqueous SystemsA. H. Mahvi, A. Maleki, A. EslamiThe potential of rice husk and rice husk ash for phenol adsorption from aqueous solution was studied. Batch kinetics and isotherm studies were carried out under varying experimental conditions of contact time, phenol concentration, adsorbent dose and pH. Adsorption equilibrium of rice husk and rice husk ash was reached within 6 hours for phenolic concentration 150-500 μg/L and 3 hours … …American Journal of Applied Sciences, Vol. 1, Issue 4 · 31 Dec 2004 · 10,177 accessesView PDFCite
Research ArticleOpen accessIn the abstractStudy of Cutoff Frequency of High Collector Current Density in SiGe Single-Heterojunction Bipolar TransistorG. M. Khanduri, B. S. PanwarThe cutoff frequency performance of an NPN Si/SiGe/SiGe Single-heterojunction bipolar transistor (SiGe SHBT) at high collector current densities has been analyzed using a 2-dimensional MEDICI device simulator. A conventional NPN Si/SiGe/Si Double-heterojunction bipolar transistor (SiGe DHBT) having uniform 14%Ge in the base region has been investigated for comparison. The analysis shows the formation of a retarding potential barrier for minority … …American Journal of Applied Sciences, Vol. 1, Issue 3 · 30 Sep 2004 · 6,895 accessesView PDFCite