In order to harness the kinetic energy of marine currents, we propose a novel ocean-current turbine with a horizontal axis. The turbine can be moored to the seabed and function similarly to kites in a water flow. To operate such turbines in a marine current, the resulting rotor torque needs to be canceled. Therefore, the proposed turbine is designed with a float at its top and a counterweight a...

Wind turbines are known to produce shadow flicker by interruption of sunlight by the turbine blades. Known parameters of the seizure provoking effect of flicker, i.e., contrast, frequency, mark-space ratio, retinal area stimulated and percentage of visual cortex involved were applied to wind turbine features. The proportion of patients affected by viewing wind turbines expressed as distance in ...

ABSTRACT The aim of this work was to define a model volleyball drills’ structure. A set parameters has been designed and tested for: i) pertinence accuracy; ii) criteria reliability; iii) practical application. Expert judges evaluated model’s pertinence, accuracy reliability. sample 50 drills assessed for analysis. demonstrated accuracy, with complete agreement among experts. Criteria were reli...

OBJECTIVES During disasters, the public expects that emergency care will be available at a moment's notice. As such, an emergency medical services (EMS) workforce that is trained and prepared for disasters is imperative. The primary objectives of this study were to quantify the amount of individual-level training EMS professionals receive in terrorism and disaster-preparedness, as well as to as...

Many challenges exist for the efficient and safe operation of wind turbines due to the difficulty in creating accurate models of their dynamic characteristics and the turbulent conditions in which they operate. A promising new area of wind turbine research is the application of adaptive control techniques, which are well suited to problems where the plant model is not well known and the plant o...

Given a computer-based instructional program and a school in which to work, it is possible to supplement or enrich the teacher’s instruction by taking over the more routine daily tasks, presenting special materials, or giving the daily lesson itself. The task of the present project was to prepare a program in arithmetic t o review and teach the basic number facts as a supplement to the teacher...

Typical wind turbine systems are sufficiently large so as to require extensive physical space for their installation and operation. These requirements preclude the use of turbines in crowded, urban environments. On the other hand, smaller turbine systems may find practical application as rooftop units, installed atop tall buildings. Such rooftop units must be much smaller than their ground-base...

application of cogeneration systems based gas turbine for heat and power production is increasing. because of finite natural energy resources and increasing energy demand the cost effective design of energy systems is essential. cgam problem as a cogeneration system is considered here for analyzing. two new approaches are considered, first in thermodynamic model of gas turbine and cogeneration ...

A 20-year-old woman presented with painful left sided facial swelling and discomfort following dental extraction for a left lower molar tooth that required local anaesthetic and an air turbine drill. The patient was initially diagnosed as experiencing an allergic reaction to the anaesthetic used. The discomfort began in the left side of her face postoperatively, radiating down her neck and to h...

Some large wind turbines use a low speed synchronous generator, directly-coupled to the turbine, and a fully rated converter to transform power from the turbine to mains electricity. This paper considers the condition monitoring and diagnosis of mechanical and electrical faults in such a variable speed machine. The application of wavelet transforms is investigated because of the disadvantages o...