The Department of Electrical and Computer Engineering ECpE at Iowa State University provides undergraduate students with the opportunity to learn electrical and computer engineering fundamentals, study applications of the most recent advances in state-of-the-art technologies, and prepare for the practice of electrical engineering. The student-faculty interaction necessary to realize this opportunity occurs within an environment that is motivated by the principle that excellence in undergraduate education is enhanced by an integrated commitment to successful, long-term research and outreach programs.
Approaches[ edit ] De-icing can be accomplished by mechanical methods scraping, pushing ; through the application of heat ; by use of dry or liquid chemicals designed to lower the freezing point of water various salts or brinesalcoholsglycols ; or by a combination of these different techniques.
Trains and rail switches[ edit ] Ice build up in train brakes jeopardizes braking efficiency. Trains and rail switches in Resistive switching thesis regions have large problems with snow and ice build up.
They need a constant heat source in cold days to assure functionality.
On trains it is primarily the brakessuspension and couplers that require heaters for de-icing. On rails it is primarily the switches that are sensitive to ice. These high-powered electrical heaters efficiently prevent ice formation and rapidly melt any ice that forms.
The heaters are preferably made of PTC material, e. PTC rubberto avoid overheating and potentially destroying the heaters. These heaters are self-limiting and require no regulating electronics; they cannot overheat and require no overheat protection.
Gulfstream G gets de-iced before departing Alaska in January On the ground, when there are freezing conditions and precipitationde-icing an aircraft is crucial. Frozen contaminants cause critical control surfaces to be rough and uneven, disrupting smooth air flow and greatly degrading the ability of the wing to generate liftand increasing drag.
This situation can cause a crash. If large pieces of ice separate when the aircraft is in motion, they can be ingested in engines or hit propellers and cause catastrophic failure. Frozen contaminants can jam control surfaces, preventing them from moving properly. In flight, droplets of supercooled water often exist in stratiform and cumulus clouds.
They form into ice when they are struck by the wings of passing airplanes and abruptly crystallize. This disrupts airflow over the wing, reducing lift, so aircraft that are expected to fly in such conditions are equipped with a de-icing system.
De-icing techniques are also employed to ensure that engine inlets and various sensors on the outside of the aircraft are clear of ice or snow. Chemical de-icing[ edit ] De-icing fluids consisting of propylene glycol PG and additives are widely used by airlines for de-icing aircraft.
However, PG is more common because it is less toxic than ethylene glycol. Even though PG is classified as non-toxic, it pollutes waterways since it consumes large amounts of oxygen as it decomposes, causing aquatic life to suffocate.A Thesis entitled NiO x Based Resistive Random Access Memories by Madhumita Chowdhury Submitted to the Graduate Faculty as partial fulfillment of the requirements for the mechanism behind the ability to switch between two resistive states.
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The tones are generated on normal phones based on the keys you press.
This table resembles a matrix keyboard. The X and Y coordinates of each code give the two frequencies that the code is composed of. Company Overview. In business since in the metro Boston/Worcester area, we provide multidisciplinary engineering research and development in a variety of electrical and mechanical areas, including advanced analog, power electronics, electromechanical, thermal and magnetic design and failure investigations.
iii resistive switching memory for non-volatile storage and neuromorphic computing a dissertation submitted to the department of electrical engineering. IMAPS/ACerS International Conference and Tabletop Exhibition on Ceramic Interconnect and Ceramic Microsystems Technologies (CICMT).
IMAPS is the largest society dedicated to the advancement and growth of microelectronics and electronics packaging technologies through professional education.