florian ion Free Articles
Geothermal Energy
Authors: Relly Victoria V. Petrescu and Florian Ion T. Petrescu Geothermal power requires no fuel (except for pumps), and is therefore immune to fuel cost fluctuations.
Read MoreMilitary aviation, Part II
Authors: Relly Victoria Virgil Petrescu and Florian Ion Tiberiu Petrescu
Read MoreInfluence of Curing Light Type on the Discoloring Stability of Dental Restorative Composite
Discoloration kinetics of 4 commercial nano-filled resin composites polymerized with LED and QTH source types in 4 different staining media held at 37°C are investigated. Quartz Tungsten Halogen (QTH) and Light Emitting Diode (LED) were used. Dental composites color change was monitored with a digital spectrophotometer at one, two and four weeks for quantitative comparison. The kinetics and intensities of the color change in accelerated aging tests in staining media were monitored and discussed. Discoloring followed diffusive driven kinetics. The four composites polymerized with QTH light showed higher differences in color change intensities compared to LED cured ones.
Read MoreFlight memories
Authors: RVV Petrescu and FIT Petrescu According to Aulus Gellius, Archytas, the Ancient Greek philosopher, mathematician, astronomer, statesman, and strategist, was reputed to have designed and built, around 400 BC, the first artificial, self-propelled flying device, a bird-shaped model propelled by a jet of what was probably steam, said to have actually flown some 200 metres. This machine, which its inventor called The Pigeon, may have been suspended on a wire or pivot for its flight.
Read MoreNACA and NASA, Part VII
Authors: Relly Victoria Virgil Petrescu and Florian Ion Tiberiu Petrescu
Read MoreAbout Helicopters
Authors: Relly Victoria Virgil Petrescu and Florian Ion Tiberiu Petrescu A helicopter is a type of rotorcraft in which lift and thrust are supplied by one or more engine-driven rotors. In contrast with fixed-wing aircraft, this allows the helicopter to take off and land vertically, to hover, and to fly forwards, backward, and laterally. These attributes allow helicopters to be used in congested or isolated areas where fixed-wing aircraft would not be able to take off or land.
Read MoreHomeopathy or «Similia Similibus Curentur»
Homeopathy or homoeopathy (from the Greek Ìμοιος/hómoios, "similar" and π¬θος/páthos, "suffering" or "disease") is a science created by Samuel Hahnemann in 1796. The homeopathic practice rests on three principles: The similarity, the individualization of cases and the infinitesimal.
Read MoreBiological Hip Joint Prostheses and Biomechanical Behavior of Implanted Femur
Biofidel femur Finite Element Models have been developed using specific combination of Computer Tomography segmentation and solid modeling software tools able to represent bone physiology and structural behavior. These biofidel Finite Element Models (FEM) is used to evaluate the modification of the physiological stress distribution in a prosthesized femur, and to assess new design criteria for the development of biomimetic hybrid biological hip prostheses.
Read MoreHistory of Aviation
The man has always wanted to be able to fly. The dream or although it has achieved, has not been reached yet fully. The fuse of the flight today is much higher than in the past, but is not yet complete. Although they have carried out the steps in the increase of the safety of a ship in flight, there are still many steps to do. For our passengers, but also for our pilots, these brave people and beautiful, it's time to do something in addition, something more.
Read MoreMedicine Services Robotics
It is an entry technique in use recently, albeit in selected centers and represents a further step in the field of minimally invasive surgery. Basically it has the same indications but, at present, is reserved for selected patients. Compared to traditional video-assisted surgery presents some important differences. The surgeon is physically distant from the operative field and sits at a console, equipped with a monitor, from which, through a complex system, controls the movement of the robotic arms.
Read MoreMechatronic System Able to Determine the Concentration of Carotenoids
Present a Mechatronic System Having Able to Determine the Concentration of Carotenoids.
Read MoreAircraft Carriers
Authors: Relly Victoria Virgil Petrescu and Florian Ion Tiberiu Petrescu
Read MoreModern Propulsions for Aerospace-Part II
The aircraft engine (ionic propulsion unit of ions, that accelerates the positive ions through a potential difference) is approximately ten times more efficient than classic system based on combustion.
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