Recent content by hjkklm

Another one question for the operation of RFID, I think it and respond as following. RFID use of radio-frequency electromagnetic fields to transfer data. The tags contain electronically stored information. Some tags are powered by and read at short ranges via magnetic fields, and then act as a...

Link here http://www.iaarc.org/publications/fulltext/isarc2004-S19-07.pdf Auto-ID (Automatic Identification) system is a proven technology of providing a more accurate, detailed, timely and advanced information for architectural operation. It is also indicated barcodes...

I have solved some questions. But here is a question which I cannot solve. Anyone know any examples for an auto-identification system that example is needed beside RFID and bar code systems? It cannot find from the Google. Please help, thanks a lot.

Questions are shown on the pictures. For the block diagram, I know (1) error signal (5) output (7) feedback signal What are the (2), (3), (4) and (6)? Besides, how to answer the RFID questions? Ans. 1. For example, mall card? Ans. 2. Ans. 3. Ans. 4. Ans. 5. Please help!

Thanks. I don't understand too.:cry: Anyone who can help me?:frown:

Electrical Engineering problems! Linear & switching mode power regulators: 1. What is the major weakness of a Buck Regulator that compared with a Linear Regulator? Is't efficiency? Passive harmonics filter: 1. If the filter reactance for harmonics is a negative value, what is...

Anyone know what is the major weakness of a Buck Regulator that compared with a Linear Regulator? Thanks.

Questions of pictures B2 and B3

All Questions are shown on pictures. My Calculated answers: A1(a) R= 19.21∠68.7o N (b) E = 19.21∠-111.34o N or = -19.21∠68.7o N <--- Is't either one answer is correct or not? If not, which answer is correct and why? Thanks. A2(b) I = 0.5mr2 = 1.125kgm2 A2(a) k=(I/m)1/2 = 0.212m...

I intend to find the all forces and then find the length through the force quantity. I will find the forces component firstly. x-component=150cosθ N (h cm), y-component=150sinθ N (40cm) 150cosθ N= 170N <----but it is math error or no solution Then I can't find, help please.

The units are different. One is the force unit, and one is the length unit. Then how to find the h? Question is attached in the file thanks

From the picture, Why do this diagram have the force of H? The wall which exert the force of H to the beam? V=W that have been known from the questions. When V=W, what else of other forces to balance the forces of G and H? Besides, the moment should been clockwise moment, then the...