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.

The effect of the context in the rotation of the actual formulas and the determination of the grammatical time

This research deals with the role of the context in the rotation between the actual forms of past, present and future, time is often divided into past, present and future formulas, the research examines the contexts that leads the original time from its position to another time that does not indicate it in the first place that shows that there is a difference between the temporal time and the grammatical, the research shows that the formula of the present verb is different from that of the past because of the existence of a presumption function and repent formula of the past about the present and future, which does not indicate by the origin of the past but the present time and future, so the context determines the grammar time.

Improving the performance of pv pumping station from rivers using TRNSYS program

We offer in this research, theory study using a modeling tool for the possibility of improving the performance of solar pumping system of rivers using submersible centrifugal pump with variable speed and moving solar panels controlled by logical microcontroller programmer (plc.).

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.

Water level control in a tank using a number of integrated circuits

The purpose of this research is to design and realization of an electronic circuitthat is able to control the water level in a tank. The circuit shows a tank water level in decimal numbers and controls the volume of water in the tank. So that when the level of water drops below a specific value that is preselected using a probe, the pump water works. When the water level reaches to another limit value, the pump stops working.We used for water level control a container which is made by transparent glass with volume of 15 L. the container is divided in nine levels. In addition to this purpose, because of large applications for realized electronic board, The circuit measures the speed of rotation of DC motorsin a wide range (0001 to 9999) cycles during a chosen period of time that ranges from 1 sec to 110 sec and display the speed of rotation in decimal numbers that appears on four displays. Moreover, the circuit contains a switch reset/start, for display clear and restart of measurement. This study was carried out on samples of tap water, for several values of distance between the probes, and power supply. We found a quick response in showing levels and high efficiency in performance. We measured the number of special motor cycles for several values of the power supply during 30 s and 60 s, and the relation between the number of cycles and applied voltagewas drawingwe found it a linear relation.

Analytical study of the behavior of R.C beam-column joint under cyclic load using ANSYS program

This research deals with analytical study of exterior Beam-Column connections behavior under seismic load. Tow parameters were considered: axial load on the column and confinement of joint region with stirrups. Ansys program was used to analytical study of three types of exterior Beam-Column connections under cyclic load. The results were shown a good agreement with general behavior of three types. The analytical results indicate that the tow parameters will improve the behavior of the connections delay cracking at joint core and increasing connection stiffness in rotation and displacement with decreasing shear value at joint.

Erath gravitational field in Syria

The Earth's gravity field is related to the Earth's mass and shape and to the position, where we apply the measurement.The measured value in any place depends on the altitude of the place angle and Earth's rotation speed around itself. In the paper we present a theoretical idea connecting the value of gravity with the above mentioned amounts. Next we calculated the value of this field in some Syrian cities. The paper is ended by important note, that the obtained relations allowing to calculate the value of the gravity field depends on the place altitude, not on the one's Longitude.

cranial base and its relation with jaws rotation in adult(CBCT scan study)

Facial structures, as well as their functions and correlations, have been extensively studied to expand the knowledge of craniofacial growth and development and to optimize growth predictions and proper indications of orthodontic and surgical treatments. The cranial base forms the boundaries of the craniofacial complex . The nasomaxillary complex is related to the anterior cranial base, whereas the mandible is related to its posterior portion. Therefore, the shape of the cranial base is an important factor in establishing the position of the maxilla and mandible. Aim: to investigate the relationship of cranial base with jaws rotation in adult orthodontically non-treated subjects using Cone- Beam Computed Tomography (CBCT) scan. Materials and methods: 27 Caucasian adult patients with no prior orthodontics treatment were selected (16 males, 11 females) .Cephalometric measurements determining type of jaw rotation were performed according to Björk's analysis. Pearson's Correlation Coefficient was calculated to investigate the relationship between the CBCT cranial base measurements and Cephalometric measurements determining type of jaw rotation . Results: This study reveal vary correlation between CBCT measurements of cranial base's dimensions and jaws rotation. Conclusions: There is no relationship between the cranial base morphology and Jaws rotation in adult orthodontically non-treated subjects.

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.

The relationship of patient gender with the chin soft tissue thickness and the mandibular rotation type

The aime of this study was to determinethe effect of gender on the soft tissue of the chin at each type of rotation patterns of the lower jaw (Anterior - normal - Posterior) The sample consisted of 100 X-ray Lateral cephalometric radiographs of (69 female _ 31 male) adults, has been selected according to the following conditions: Age between 18-26 years old, , exclusion of all cases of Intenseocclusal abnormalities , Permanentocclusionand there is noformaldentalabnormalitieswithout takinginto accountthe thirdmolars, The absence ofa previousorthodontic treatment, the patient free fromsystemic diseasesorcongenital malformationsanddevelopmentaldisordersandsyndromesand there is no story of a previous surgery in the head and neck area The sample was divided into groups according tosex andmandibularrotation(Anterior - normal - Posterior). Then we studied variablesrepresentative the lower jaw rotation andanother ones representativethemeasurementsof the chinsoft tissue. The results showed a difference theaveragesof the soft tissue thickness and the indicators of mandible rotation between the sexes In favor of males, And theaveragesof thevariables showed Correlationbetween chinsofttissuethicknessin femaleswiththree typesoflower jawrotation Compared with males.