EXPERIMENTAL STUDY OF THE BEHAVIOUR OF SMALL WIND TURBINE DURING THE STARTING PERIOD

This research shows that the design of wind turbine blade for the best production of energy produces a turbine with a problem of start-up. The study focused on ways to improve the process of the small wind turbine start-up at the low wind speed with the stability of the pitch blade angle, and study the behavior of the turbine during the stage of angular acceleration after the start-up until the turbine reaches the speed of rotation that enable it to produce the energy.

Studying of Possibilities for Performing a Diagnostics’ Model (Instruction phase) of Marine Engines’ Vibrations Onboard Ships

In this study, we have developed a mathematical model, which formed the basis for the development of a digital diagnostic model, for the question of the relation between the engine torque (and therefore power), and the clearances in the basic and secondary bearings of the crankshaft, to diagnose clearance values in these bearings, /which will inevitably affect on the torque and the vibrations of the engine/, where multiple and various grand-scale case experiments were carried out through simulation and arithmetic experimentation on a diagnostic model, which constituted the first and main phase (the instruction phase) of the full diagnosis. And at the end we discussed the results and put some conclusions and recommendations to complete the work in the future.

Simulation experimental results in Studying of analysis and design of beam column connection in the precast concrete framed structures

Our subject contains studying criterions which ensuring a durable serving of concrete frame joints, and then choosing two connections according to its deployment and the availability of its arithmetic relations and easy to be prepared from local materials, and discuss experimental results of the resent study which allow us to achieve the next part of our research,which is a structural designing programme by visual basic language to serve the work in order to be fast and precise. the last part of the subject is comprising a number of actualizations which confirm that the process of programming is correct, and then compare the results of experimental programs and code with our programme results to achieve many important ameliorations on this programme to become more easily and better.

Study of the relationship between bone resorption around immediately placed single tooth implants and insertion torque

The aim of this study was to evaluat the influence of insertion torque on the survival of immediately placed single tooth implants and bone resorption process around it . Materials and methods : 8 healthy patients received 24 conical implants ( IDI-BIO ) with sand blasted and acid etched surface . All implants inserted immediately in extraction sites, the sample were divided into two groups: The implants in the first group were inserted with insertion torque below 35 Ncm (mean 25 Ncm ) , while in the second group the implant were inserted with insertion torque above 35 Ncm (mean 52,2) .Implant survival and marginal bone loss MBL were evaluated after two , six and nine months for both groups .Results : four implants from the first group failed to osseointegrate, and statistical analysis of the data showed no correlation between insertion torque and peri- implant bone resorption .

In Vitro Study aboutthe Effect of Dual-Thread and Diameter onthe Orthodontic Miniscrews Primary Stability

The aim of the study was to determine the effect of Dual-Thread and diameter on the orthodontic miniscrew primary stability, and define the best shape and diameter of miniescrew can be used to give the best stability. The study sample consisted of (24) orthodontic miniscrews made of (Ti-6Al-4V) alloy with 2 shapes (regular and Dual-Thread) , and 2 diameters (1.6 , 1.8mm). The experiment has been divided into 3 tests : measuring the maximum insertion torque , the Periotest value , the maximum removal torque. The results showed that the maximum insertion and removal torque were statistically higher while the Periotest values were statistically lower when using the Dual-Thread and the diameter of 1.8 mm than the regular shape and the diameter of 1.6 mm(P>0.01)

Study of Bulk Cargo Influence Upon Ship's Righting Lever

This paper presents a new method for studying the bulk cargo behavior and its effects on righting lever. Effects of cargo sliding in holds are computed for each heel angle. The deficiency of righting lever is quantitatively computed and plotted on the designed application windows. For the first time a three characterizing angles are presented here, what offer a new clear vision about the cargo sliding steps.

Design of the mid-Transverse Section in Shiphull

The mid-transverse section is considered one of the significant sections in the shiphull, because it exists in the middle of its calculated length, where the bindings moments reach the maximum, in consequence the hull strength can be determined through the strength of this section. Its design process includes the determination of the dimensions of plats and different framing beams and considered one of the important stages in the hull design process. This research includes the estimation of calculated values of binding moments, inertia and resistant’s moments of this section area, initiated from the providing conditions of critical strength and fatigue strength. It also includes, the formals used for the determination of longitudinal elements dimensions through the transverse thicknesses and metal distribution type among them. The longitudinal strength of the hull was evaluated according the perpendicular and tangential stresses.