Constantly rising operating pressure and temperature in turbine drivers push the material capabilities of turbine blades to the limit. The recent development of heterogeneous objects by layered manufacturing offers new potentials for the turbine blades. In heterogeneous turbine blades, multiple materials can be synthesized to provide better properties than any single material. A critical task o...

In this work, a second-order sliding mode control algorithm is proposed for variable speed laboratory size DC generator wind turbine experiment system in order to track a speed profile and operate the wind turbine at maximum power extraction. The turbine torque, which varies with the wind speed, is considered as an unknown disturbance and rejected by the sliding mode strategy. The sliding mode ...

background and objectives: the weaning procedure of mechanical ventilation in many patients is a difficult and long process and increases the time of mechanical ventilation. there are numerous ways to achieve this goal. one common way is using cpap-ventilator. considering the lower price of blender-humidifier compared to cpapof ventilator and the limited number of studies in this field, this st...

abstract background: ventilator-associated pneumonia (vap) is a common side effect in patients with an endotracheal tube. this study aimed to evaluate the effect of an upper respiratory care program on the incidence of vap in mechanically ventilated patients. materials and methods: in this clinical trial, 62 patients with endotracheal tube were selected and randomly allocated to intervention or...

This paper presents the results of simulations of the complete three-dimensional fluid flow through the Spiral Casing, Stay Vane, Guide Vane, and then through the Francis turbine runner of the Derbendikan power station. To investigate the flow in the Francis turbine and also to identify the loads acting on the turbine blades, a three-dimensional model was prepared according to specifications pr...

Wind energy is a rapidly growing form of renewable energy in the United States. While summary information on the total amounts of installed capacity are available by state, a free, centralized, national, turbine-level, geospatial dataset useful for scientific research, land and resource management, and other uses did not exist. Available in multiple formats and in a web application, these publi...

a 21-year old man with cervical spinal cord damage due to diving was admitted in the icu. tracheostomy was performed due to prolonged mechanical ventilation. left lung atelectasis happened frequently. because of the difficulty of bronchoscopy and failing of recruitment, using a double lumen, two tracheal tubes were guided into the left and right lungs through the tracheostomy stoma site. after ...

∙ Patient surveillance technology can improve adherence to and optimization of ventilator protocols, shorten the time on the ventilator, and reduce the likelihood of acute lung injury. ∙ Patient surveillance technology can aid clinicians in preventing or reducing the incidence of adverse ventilator associated events, including ventilator-associated pneumonia, and ultimately, help improve patien...

flow in the first two-stage of v 94.2 gas turbine is simulated numerically. in this turbine, the second stator is clocked relative to the first stator to different positions. steady-state analysis was carried out by varying the circumferential relative position of the consecutive stator vanes to study the effects of the clocking on turbine performance. a density based compressible inviscid flow...

determination of the starter torque-speed diagram is a major task in the design or selection of a proper gas turbine starter. in this paper, the maximum power of the mgt-40 gas turbine starter was calculated based on the dynamics of the rotor, start-up logic, and compressor map. in a recent research, the pressure ratio was assumed as a linear function of the rotor speed and the required starter...