Physics, 25.06.2019 00:00 quise2ross

1. describe the difference between active, passive, and semi-passive rfid tags.

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Passive tags are the most prominent type in use within RFID today. In general, they are the most simple in design. The tag does not contain a battery and depends on the strength of the reader RF signal to cause the tag to generate a response. In general, the passive tag contains a serial number, typically 96 to 128 bits in length. The serial number will most often be just a serial number with no connection to a particular product or application. The serial number can be read and then used to establish a relationship to a product within an application database.

The semi-passive tag operates similarly to the passive tag, using the reader signal to cause a response from the tag. The primary difference is that the semi-passive tag does have a battery -- not for generating a response, but to power electronics that are used in conjunction with off-board sensors such as a thermal sensor. The sensor reading is incorporated into the tag return signal along with the tag serial number. Unsurprisingly, the semi-passive tag has most of the limitations noted for the passive tag in terms of slow read speeds and short read distances.The price point for semi-passive tags is higher than that for the passive tag, with prices ranging from $10 to $50.

Active tags contain a battery and do not depend on the reader signal to generate a response. As a result, the active tag can be read at much greater distances, with read distances up to 100 yards seeming quite common. Active tags may be either read-only or read/write, thus allowing data modification by the reader. Data storage on active tags has a range up to 8K bytes, a common value. Data rates are also faster in the active tag, thus making electronic toll collection and weigh station bypass highly successful applications of RFID. There are also active tags that provide off-tag communication via RS232/RS485 protocols, or JBUS to provide such information as fuel levels and odometer readings for transportation gate control applications. As one might suspect, the active tag is more expensive, with prices ranging from $20 to over $100 per tag.

Answer from: Quest

carbon is found in all living things. carbon atoms move constantly through

living organisms, the oceans, the atmosphere, and the earth’s crust in what is

known as the carbon cycle. the directions taken by carbon atoms through this

cycle are very complicated and can take millions of years to make a full circle.

all animals, from humans to the dinosaurs are part of the carbon cycle. when

animals eat food, they get carbon in the form of carbohydrates and proteins.

in animals, oxygen combines with food in the cells to produce energy for daily

activity and then gives off carbon. the carbon combines with oxygen to form

carbon dioxide (co2) and is released back into the atmosphere as a waste

product when animals breathe and exhale.

from 145-65 million years ago, earth was much

hotter than today and covered with dense,

tropical swamp forests. the trees and other

plants were immense and

provided an endless supply of

food for the giant animals that

roamed the land. somewhere in

the air above one of these

forests, a lone carbon atom has joined

up with two oxygen atoms to form a molecule of co2.

the co2 molecule was sucked into the tiny holes (stomata) on the leaf of a

fern plant and joined with sunlight, chlorophyll and water to make food and

energy in the plant’s cells through photosynthesis. the oxygen (o2) from the

co2 molecule was sent back into the atmosphere; the carbon atom (c) was

detached and used to make a molecule of sugar.

if that carbon atom had been eaten instead, a totally

different situation would have developed. let’s say

that a giant plant-eating dinosaur (herbivore) ate the

fern for breakfast, and swallowed the carbon in the

fern in the form of carbohydrates and proteins. in

the process of respiration, oxygen combined with

the carbohydrates and proteins in the dinosaur’s cells

to provide energy for its daily activity.

Answer from: Quest

“when two plates carrying continents collide, the continental crust buckles and rocks pile up, creating towering mountain ranges. when an ocean plate collides with another ocean plate or with a plate carrying continents, one plate will bend and slide under the other. this process is called subduction. “ i found this on google i hope it

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