Microcontroller-Based High-Power-Factor Electronic Ballast to Supply Metal Halide Lamps Marco Antonio Dalla Costa‚ Member‚ IEEE‚ José Marcos Alonso Álvarez‚ Senior Member‚ IEEE‚ Jorge García‚ Member‚ IEEE‚ André Luís Kirsten‚ Associate Member‚ IEEE‚ and David Gacio Vaquero‚ Student Member‚ IEEE Abstract—The analysis‚ design‚ and implementation of a microcontroller-based electronic ballast to supply metal halide (MH) lamps are presented. The proposed topology is based on the integration of the buck
Premium Fluorescent lamp
Releases New PL EDGE Series Vertical DIRect and BYPass LED Lamps South San Francisco‚ CA‚ September 18th‚ 2015 -- GREEN CREATIVE‚ the commercial grade LED lighting manufacturer proudly announces the launch of its first PL V 11W DIR‚ PL V 11W DIR HIGH CRI and PL V 11W BYP lamps. Part of GREEN CREATIVE’s new PL EDGE Series‚ the PL V DIR and PL V BYP lamps are CFL retrofit solutions for a variety of existing vertical lamp installations. All PL V lamps feature exceptional efficacy and a patent pending round
Premium Lighting
electricity/year: 98.55 × 1 yuan / kWh = 98.55 yuan economic comparison of an ordinary lamp and LED Tube: The price of a 18W LED tube T8 is 100 yuan ‚ the warranty is three-year! Comparison of the three years following table: Secondly 1) lifespan of LED tube T8> 30‚000 hours (lifespan of ordinary fluorescent tube is 6000 hours) 2) an LED tube T8 is equivalent to six ordinary fluorescent lamps，not to mention the saving on cost of labor and maintenance For an LED tube T8 …… so the
Premium Fluorescent lamp Black light Incandescent light bulb
In the first chapter of the Orientation of critical theories entitled The Mirror and the Lamp (1953) M. H. Abrams concentrates on four main elements; the universe‚ the audience‚ the artist‚ and the work and relates them to four broad critical theories that explain the nature and worth of art. He explains that almost all theories will make use of at least one of these elements‚ some all four. That is a critic will derive from one of these terms his principle categories for defining‚ classifying and
Free Poetry Aristotle Art
POISONOUS GASES rather than the direct effects of lava flows or ash showers are the greatest reason for loss of life. An example is the eruption from the Laki volcano in 1783 (see first link below) in which an estimated 25% of the population of Iceland was killed. "The system erupted over an 8 month period during 1783-1784 from the Laki fissure and the adjoining Grímsvötn volcano‚ pouring out an estimated 14 km3 (3.4 cu mi) of basalt lava and clouds of poisonous hydrofluoric acid & sulphur
Premium Volcano Basalt
NOVA: Secrets of the Sun 1. Solar storms take place in two stages. The first stage is the solar flare which “releases an outburst of x-rays.” (NOVA) The second stage is the coronal mass ejection‚ with is a “wave of billions of tons of electrically charged particles.” (NOVA) 2. Auroras can be very bright. In fact‚ in 1859 there were reports that miners in Colorado were awaken by an aurora in the middle of the night. Believing that dawn had arrived‚ they went to work early. 3. During the 1960’s
Premium Sun Earth Light
assisted in the making of this hypothesis was the recalling of the fact that objects with lower temperatures (such as air or water) become denser. Two experiments that I found to be quite similar to this one were the Density Column and the Bubbling Lava Lamp. The Density Column measures the density of seven different liquids by layering them on top of each other. By doing this experiment‚ one is able to find out which liquid is the most dense; with the order ascending
Free Liquid Water Petroleum
Nyiragongo; it is very much more than that though. Mt. Nyiragongo is a stratovolcano‚ a composite-cone volcano. It is on the African plate‚ where it is splitting in the middle at a divergent plate boundary. The type of lava in the enormous lava lake is melilite nephelinite‚ mafic lava‚ with low viscosity due to the low silica content. The magma is olivine melilititic formed by small-fraction partial melting at the base of the lithosphere. The rock that comes from Mt. Nyiragongo is melilite nephelinite
Premium Volcano
Finally‚ they drove up the igneous road to see the very top of the volcano above them‚ the glow of the molten lava shining above and around the rim‚ the gleam even more notable against the dimmed sky. Caroline parked where the path ended and unlocked the doors. She turned to Rachel‚ who was about to open the door but turned to her when she felt her gaze. “Good luck‚” Caroline wished her‚ and she nearly missed Rachel’s quick twitch of a smile. “Thanks‚” she responded with a curt nod before opening
Premium 2007 singles Debut albums 2005 singles
1. Dancing Raisins Here’s another quick and easy science experiment. All you need is a glass of clear soda‚ such as ginger ale or club soda‚ and several small raisins. Fill a glass with soda. Leave about ½ inch (12.5 mm) of space at the top. Drop the raisins in. Those tiny bubbles attaching themselves to the raisins are carbon dioxide (CO2) bubbles. The irregular surface of the raisins enables a lot of CO2 to accumulate. When enough gas bubbles attach to the raisins‚ they act like tiny balloons
Premium Water Carbonated water Distillation