Thames Festival Finale Fireworks
Posted in Chemical Sensors on Nov 12th, 2012 | 0 commentsThames Festival Finale Fireworks
Image by Dominic’s pics
Part of a Set / Virtual Firework Display Slideshow documenting the firework show that marked the end of the "the mayor’s" Thames Festival in London on the evening of Sunday September 11th 2011.
The display was presented by Pains Fireworks.
A delay in the start of the display from the scheduled time was attributed by the crowds to incompetence by "Bumbling Boris" Johnson – the London Mayor – part of the British patrician "limited liability" ruling class. "I’m in charge, but if anything goes wrong, somebody else will be sacked…"
Like the extreme audio dynamic range of Taiko or Samba drumming, it is not really possible to record the visual brilliance of fireworks with a camera. You have to experience firework displays live, in person. These images were taken at the slowest sensor speed (ISO 100), maximum aperture (to minimise diffraction "glare" effects) and with a variety of exposure times ranging from about 0.5 to 2 seconds. The intense light caused some "bleaching" of the paths of the lights, and so the colours have been enriched if Photoshop. (In retrospect I might have used a slightly smaller aperture.)Additionally, the river and land areas have been selectively lightened in Photoshop. Fortuitously, a gentle breeze caused the smoke to drift eastwards, away from my vantage point on Waterloo Bridge, so the view of the fireworks was relatively unobstructed by smoke.
Fireworks date from at least the 7th century in China. The colours are believed to have been conventional incandescent "black body" bonfire colours: red, orange, yellow and white. (It is theoretically possible to produce pale blue just by heating, but this requires impracticably high temperatures. It is not possible to heat something to "green hot" or "purple hot".) It is believed that from about 1830 in Italy metal salts were introduced to produce a wider, richer hued, spectrum of colours by chemical luminescence. This approach can be problematic, as it can be difficult to create stable, practical, chemical compositions. It has been suggested that some shades of green are still difficult to achieve.
See also:
Fireworks [Wikipedia]
Firework Colours [The chemistry of Fireworks by Reema Gondhia, Imperial College]
History of fireworks [Pyro Universe]
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Which of the following receptors does not involve depolarization leading to an action potential in a sensor?
Posted in Electrochemical Sensors on Nov 11th, 2012 | 0 commentsQuestion by Kevin: Which of the following receptors does not involve depolarization leading to an action potential in a sensor?
6.Which of the following receptors does not involve depolarization leading to an action potential in a sensory neuron?
•Mechanorecptors
•G-protein receptors
•Chemoreceptors
•Photoreceptors
•Exteroceptors and interceptors
Best answer:
Answer by Claudio
-Photoreceptors
Activation of rods and cones is actually hyperpolarization; when they are not being stimulated, they depolarize and release glutamate continuously. In the dark, cells have a relatively high concentration of cyclic guanosine 3′-5′ monophosphate (cGMP), which opens ion channels (largely sodium channels, though calcium can enter through these channels as well). The positive charges of the ions that enter the cell down its electrochemical gradient change the cell’s membrane potential, cause depolarization, and lead to the release of the neurotransmitter glutamate. Glutamate can depolarize some neurons and hyperpolarize others.
When light hits a photoreceptive pigment within the photoreceptor cell, the pigment changes shape. The pigment, called iodopsin or rhodopsin, consists of large proteins called opsin (situated in the plasma membrane), attached to a covalently bound prosthetic group: an organic molecule called retinal (a derivative of vitamin A). The retinal exists in the 11-cis-retinal form when in the dark, and stimulation by light causes its structure to change to all-trans-retinal. This structural change causes it to activate a regulatory protein called transducin, which leads to the activation of cGMP phosphodiesterase, which breaks cGMP down into 5′-GMP. Reduction in cGMP allows the ion channels to close, preventing the influx of positive ions, hyperpolarizing the cell, and stopping the release of neurotransmitters. The entire process by which light initiates a sensory response is called visual phototransduction.
Give your answer to this question below!
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Light sensor 2.0
Posted in Light Sensor on Nov 11th, 2012 | 2 comments
So this is my new and improved light sensor. I made it the hard way without LM3195 (because I couldn’t find one) and without micro-controller (because I don’t know how to use one yet). My sensor has 11 LEDs so it’s a little bit better then a LM3915 light sensor.
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Ford MAF Sensor Testing, 12V Power
Posted in Electrical Sensors on Nov 11th, 2012 | 3 comments
You do not need a Scan Tool to test the Mass Air Flow Sensor on your Ford. Here, we’ll walk you through the whole process of testing and troubleshooting the FORD Mass Air FLow sensor, using only a Multimeter. Although the mass air flow sensor on your Ford is inside the round Air Filter canister assembly and hidden from view, it can be diagnosed in four easy steps. The Mass Air Flow Sensor on your FORD may have 6 or 4 wires coming out of the Plastic Round Air Filter Box. If the ford mass air flow sensor has 6 wires, this indicates that the Air Temperature Sensor is integrated within the mass air flow sensor itself. If it’s a 4 wire sensor, then the Air Temp Sensor is located externally, usually on the Air Duct connecting the Round Air Filter Assembly to the Throttle Body. Get the scoop on testing your FORD MAF sensor. Presented using advanced software CG animation technology to help you understand. Part of our Automotive Technology series shown here on this channel. Enjoy…
Video Rating: 4 / 5
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Carsem Sets Up a Sales Office in Japan
Posted in Level Sensor on Nov 10th, 2012 | 0 commentsIpoh, Malaysia (PRWEB) November 09, 2012
Carsem, a leading provider of turnkey packaging and test services to the semiconductor industry announced that have setup a marketing & sales office in Tokyo, Japan. This office will give Japanese customers much easier access to Carsem, its capabilities and services. The office in Japan can be contacted at email: ichiroanjo (at) carsem (dot) com
Mr. Tom Parrott, General Manager of Asia Sales stated, Subcontract assembly and test inquires from Japan have been growing and Carsem feels this is the perfect opportunity to establish business opportunities in Japan. We believe having an office in Japan will help Carsem to start this new business and give our Japanese customers a local contact to get access to Carsem and our capabilities.
About Carsem
Carsem is a leading provider of turnkey packaging and test services to the semiconductor industry, and offers one of the widest ranges of package & test portfolios in the world. To meet the growing demands of the telecommunications and wireless markets for smaller, faster, thermally-efficient devices, Carsems portfolio includes many advanced technologies, such as the Micro Leadframe Package (MLP), Flip Chip On Leadframe (FCOL), an SiP (System-in-Package) Technology, Cavity-Package Motion and Pressure Sensor technologies as well as stacked-die capability. Carsem also offers a full range of turnkey test services for RF, mixed-signal, linear, digital and power devices. Our factories maintain world-class quality standards having achieved SAC Level 1, ISO-9001, ISO-14001, QS-9000, TS16949 certifications, and are supported with a global network of sales and engineering support offices. Carsem is a member of the Hong Leong Group with factories located in Ipoh, Malaysia, Suzhou, China and sales offices across the USA, the UK, China, Malaysia and Taiwan. Carsem, Inc. sales headquarters is located at 269 Mt. Hermon Road, Suite 104, Scotts Valley, CA 95066, phone (831) 438-6861, fax (831) 438-6863, web site: http://www.carsem.com
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Is an infrared temperature sensor accurate when measuring hot frying oil?
Posted in Laser Sensor on Nov 10th, 2012 | 0 commentsQuestion by Visual Echo: Is an infrared temperature sensor accurate when measuring hot frying oil?
How accurate will my reading be if I’m pointing a handheld sensor with laser aiming dot for a one inch surface area right at the oil? It seems to work fine for bacon, but haven’t tried fried chicken yet. I’m using a cast-iron skillet on a natural gas range top burner.
Best answer:
Answer by greengirl
Well if you want to test how hot the oil is that will work, if you want to test the temp of the outside of the fried chicken that will also work, but you cannot tell the temperature of the inside if the fried chicken with infrared temperature thermometer without actually cutting the chicken open.
Add your own answer in the comments!
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