QR (Quick Response) Code

​​What is QR code actually and how it works?

QR codes are a technology that appear everywhere from supermarket shelves and magazines to hiking trails and tombstones.
QR (Quick Response) code is the trademark name for the two dimensional barcode system. It was originally invented in 1994 by Denso Wave, a Toyota subsidiary, as a way to track vehicles as they were assembled, and to scan components at high speeds. While Denso Wave does hold the patent on the technology, it has granted free licence on it, going so far as to publish the spec online, and allowing anyone to use it.
The conventional one dimensional barcodes used on virtually every consumer product are mechanically scanned. That is, they're read by physically bouncing a narrow beam of light onto the code, which can be interpreted using the pattern of light reflected off the white gaps between the lines.

Comments

Post a Comment

Popular posts from this blog

Vaccine Nationalism

Image
What is vaccine nationalism? When a country manages to secure doses of vaccines for its own citizens or residents and prioritises its own domestic markets before they are made available in other countries it is known as ‘vaccine nationalism’ .  This is done through pre-purchase agreements between a government and a vaccine manufacturer. For example , the United States, the United Kingdom, Japan, and the European Union have spent tens of billions of dollars on deals with vaccine front runners such as Pfizer Inc, Johnson & Johnson and AstraZeneca Plc even before their effectiveness is proven. Pre-purchase agreements: It is an agreement where, even before the end of final stage human trials or regulatory approval, several wealthier countries enter into pre-purchase agreements with vaccine manufacturers. History of Vaccine Nationalism The process of hoarding vaccines can be traced back to a similar situation that happened in 2009 during the H1N1 flu pandemic. Australia, the first ...
Read more

Mystery Disease in Andhra Pradesh

Image
A ‘mystery disease’ has emerged in Eluru, Andhra Pradesh. It has caused illness to almost 450 people and few deaths also. It is believed that organochlorines are responsible for this mysterious disease. The symptoms like seizures, nausea, dizziness and headaches are seen among patients. Heavy metals like Lead and nickel content in drinking water and milk was primarily established as the root cause of the disease. It is found in the blood sample of patients. What are Organochlorines? Organochlorines (OC) are a group of chlorinated compounds that belong to the class of persistent organic pollutants (POPs) with high persistence in the environment. They are widely used as pesticides. Applications : OC insecticides were earlier used to control malaria and typhus; they were later banned in most countries.  They are relatively cheaper; as a result Dichlorodiphenyltrichloroethane (DDT), hexachlorocyclohexane (HCH), aldrin and dieldrin are among the most widely used pesticides...
Read more

What is Contour Bunding?

Image
Contour Bunding involves the placement of lines of stones along the natural rises of a landscape, and Contour farming. These techniques help to capture and hold rainfall before it can become runoff. They also inhibit wind erosion by keeping the soil. Contour bunds is a traditional low-cost method of soil conservation suitable for sloping land; it promotes water retention and helps prevent erosion. Contour bunding is a proven sustainable land management practice for marginal, sloping, and hilly land where the soil productivity is very low. Contour farming is used on sloping land where crops are grown. Contour farming is most effective on slopes between 2 and 10 percent.
Read more