Information

27/06/2021

26/01/2021

https://youtu.be/v7XztOokA9Q

Let's see working of an MCB in detail.Be our supporter or contributor: https://www.youtube.com/channel/UCqZQJ4600a9wIfMPbYc60OQ/joininstagram : https://www.i...

23/10/2020

COB (chip on board) VS ETI FC (Flip-Chip)

COB (chip on board) LED, which comes as a high powered chip in direct contact with a printed circuit board.COB and SMD can be similar because like SMD, COB chips have multiple diodes on the same “wafer” or chip. However, this is where the similarities end. In fact, on every COB chip there are multiple diodes; typically 9 or more.

ETI FC(Flip-Chip) LED is a new patented technology by mounting the LED diode upside down compare to the present day COB LED production.
Benefit of Flip-Chip LED:
– 200 times faster thermal dissipation rate on each diode compare to ordinary COB LED

– No need heavy weight thermal HEAT SINK (due to better heat dissipation rate)

– Longer life: Almost no decade (estimated about 3% in 6000 hours)

– Higher module reflective brightness.

– No Shadow of light, no lead frame for certain light angles limitation ( wider light angle of about 120 degree)

– Producing better lighting specification than other same 450mA current LED products.

source:https://www.vehicode.com/blog/what-are-the-various-types-of-led-chip-packages-available-in-the-market.html

14/10/2020

Erythritol powder used in air flow to remove stain

A look at how Airflow cleaning can remove stains and build-up from teeth

14/10/2020

-gel used EDTA
-EMD mean enamel matrix derivative
-using EMD with bone graft in combination make a synergistic effect

Regenerative therapy around teeth is one of the most difficult procedures in dentistry, this is why I want to share in www.dentalsurgerychannel.com a case wh...

22/09/2020

https://youtu.be/8a3r-cG8Wic

We're now on Patreon! Please support us at: http://www.patreon.com/minuteearth Can you find an oxbow lake in GoogleEarth? Share your findings (pictures or co...

22/09/2020

https://youtu.be/bodsuTucSxQ

Liquid can levitate and boats can float upside down in this gravity-defying physics experiment. Researchers in Paris have been investigating the effect of ve...

25/05/2020

Shallow water blackout, breath-hold blackout is a loss of consciousness caused by cerebral hypoxia towards the end of a breath-hold (freedive or dynamic apnea) dive, when the swimmer does not necessarily experience an urgent need to breathe and has no other obvious medical condition that might have caused it.

25/05/2020

s***m whales produce short duration sound signals named clicks. Usual clicks are produced in a 10 Hz–30 kHz frequency band, at a rate defining an inter-click interval (ICI) that varies from 0.5 to 2.0 seconds during descent from the surface until the whale begins its ascent to the surface.

More about its clicks:nature.com/articles/srep45517
Video source:youtu.be/_z2Lfxpi710
S***m Whale Sounds:dosits.org/galleries/audio-gallery/marine-mammals/toothed-whales/s***m-whale/?vimeography_gallery=30&vimeography_video=227089578

12/05/2020

Electrical discharge machining (EDM), also known as spark machining, spark eroding, die sinking, wire burning or wire erosion, is a manufacturing process whereby a desired shape is obtained by using electrical discharges (sparks). Material is removed from the work piece by a series of rapidly recurring current discharges between two electrodes, separated by a dielectric liquid and subject to an electric voltage. One of the electrodes is called the tool-electrode, or simply the "tool" or "electrode," while the other is called the workpiece-electrode, or "work piece." The process depends upon the tool and work piece not making actual contact.
EDM power system is provided by a direct current pulse power generator. The EDM power system can be classified into RC, LC, RLC, and transistorized types. The transistorized EDM power systems provide square waveform pulses with the pulse on-time usually ranging from 1 to 2000 msec, peak voltage ranging from 40 to 400V, and peak discharge current ranging from 0.5 to 500 A. With the RC, LC, or RLC type power system, the discharge energy comes from a capacitor that is connected in parallel with the machining gap. As a result of the low impedance of plasma channel, the discharge duration is very short (less than 5 msec), and the discharge current is very high, up to 1000 A. The peak voltage is in the same range of transistorized power systems.

Source:
engineersedge.com/edm.shtml

en.wikipedia.org/wiki/Electrical_discharge_machining

05/05/2020

Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding when heated sufficiently.

Perlite contain:-
•70–75% silicon dioxide: SiO2
•12–15% aluminium oxide: Al2O3
•3–4% sodium oxide: Na2O
•3–5% potassium oxide: K2O
•0.5-2% iron oxide: Fe2O3
•0.2–0.7% magnesium oxide: MgO
•0.5–1.5% calcium oxide: CaO
•3–5% loss on ignition (chemical / combined water).

Uses:-Because of its low density and relatively low price it is used in soil amendment or alone as a medium for hydroponics. When used as an amendment it has high permeability / low water retention and helps prevent soil compaction. Perlite is an excellent filtration aid.

More:en.wikipedia.org/wiki/Perlite

25/04/2020

Preparation Calcium Oxide (CaO) from Chicken Eggshells

Eggshell containing calcium carbonate (94%),
calcium phosphate (1%), organic compounds (4%), and
magnesium carbonate (1%).
Preparation calcium oxide from eggshells via calcination process(heating to high temperatures) in this article show us what is the optimum temperature to get calcium Oxide via a five different temperature 600ºC, 700 °C,800 °C, 900 °C, and 1000 °C.at temperature of 600 °C produced powder in black color, at 700 °C produced blackpowder mixed with gray, at 800 °C formed solid gray, at 900 °C calcination obtained white solid with little gray,and at 1000°C obtained white solid. Not only color affected various calcination temperatures showed too variation in CaO at 800 ºC, 900 ºC and 1000 ºC while
diffraction pattern for CaO did not appear at 600 ºC and 700 ºC. So the most optimum temperature to get calcium Oxide is 1000ºC.

source:researchgate.net/publication/306270335_Preparation_Calcium_Oxide_From_Chicken_Eggshells