beryllium‚ carbon‚ iron and aluminum. • Laments found in small amounts include cadmium‚ mercury‚ and thallium. • Elements found in trace amounts include americium‚ antimony‚ arsenic‚ barium‚ bismuth‚ boron‚ cobalt‚ europium‚ gallium‚ germanium‚ gold‚ indium‚ lithium‚ manganese‚ nickel‚ niobium‚ palladium‚ platinum‚ rhodium‚ ruthenium‚ selenium‚ silver‚ tantalum‚ terbium‚ thorium‚ titanium‚ vanadium‚ and yttrium. • Mercury: found in fluorescent tubes (numerous applications)‚ tilt switches
Premium Lead Metal
RECENT DEVELOPMENTS IN NANOPARTICLES. INTRODUCTION Nanotechnology is a multidisciplinary scientific field undergoing explosive development. Nanometer-sized particles offer novel structural‚ optical and electronic properties that are not attainable with individual molecules or bulk solids. Advances in nanomedicine can be made by engineering nanoparticles that are capable of targeted delivery of drugs. This leads toward the concept and possibility of personalized medicine for the potential
Premium Nanotechnology Nanoparticle
chemistry is used in many ways in computers also.for example.‚we use many elements like silicon‚zinc‚aluminium‚copper etc.‚. in designing and in developing the hardware of computer. Electronics: Chemistry is important in many electronics fabrication and packaging methods and may one day help extend the trend toward faster and cheaper electronics by \molecular electronics‚" where individual molecules are used as electronic components. Chemists have always played a fundamental role in the
Premium Transistor Integrated circuit Semiconductor
impurity materials that are used to make N-type semiconductor more negative. 7. Give three examples of impurity materials that are used to make P-type semiconductor more positive. 8. What is the repelling force of the barrier voltage in the germanium and silicon semiconductor? 9. What are the two current carriers of diode? 10. Define diode. II. Testing Diode (5 pts each) 1. Write how to test Good Diode with your ohmmeter. 2. Write how to test Shorted Diode with your ohmmeter.
Premium Semiconductor
commercially important of these elements are silicon and germanium. Semiconductor materials are useful because their behaviour can be manipulated by the addition of impurities‚ known as doping .Doping a semiconductor with a small amount of impurity atoms greatly increases the number of charge carriers within it. When a doped semiconductor contains excess holes it is called "p-type"‚ and when it contains excess free electrons it is known as "n-type". Germanium‚ gallium arsenide‚ and silicon carbide are common
Premium Semiconductor
are free to move within. Ex. Copper‚ aluminum‚ silver‚ iron‚ carbon‚ water >> materials whose electric charges are not free to move within. Ex. Glass‚ plastic‚ rubber‚ silk >> materials that allow only some charges to flow through. Ex. Silicon‚ Germanium >> materials which totally allow current to pass through without any resistance. >> states that like charges repel and unlike charges attract. >> states that the force of attraction or repulsion between two small charged bodies is directly proportional
Premium Electric charge Electromagnetism Electron
consists of a dipole antenna‚ a choke and a diode. The antenna receives the GSM signals in media. Then a small amount of charge is induced in the choke. The diode demodulates the signal and finishes detecting. The diodes must be schottky diodes or germanium diodes. Since the forward voltage of a silisium diode is high‚ it won’t give a sufficient result in this circuit. LM358 amplifies the received signal. It contains two separate op-amps that are supplied by a common power source. R3 and R7 resistors
Premium Mobile phone Vacuum tube Resistor
* have properties intermediate between metals and nonmetals * are represented by only seven elements: boron (B) antimony (Sb) silicon (Si) tellurium (Te) germanium (Ge) astatine (At) arsenic (As)
Free Chemical element Atom Atomic number
3.1 CATHODE RAYS 3.1.1 Explain that cathode ray tubes allowed the manipulation of a stream of charged particles. DEFINITTIONS: * Cathode Ray Tube: is an evacuated tube which allows the unobstructed movement of cathode rays from a cathode to an anode. * Cathode Ray: Are negatively charged particles and can therefore be deflected. * This can be shown by 3 facts: * They leave –ve charge on the surfaces they strike * They are deflected by magnetic fields as predicted
Premium Electron Photon
How many inventions in your lifetime can you think of that have changed everything in our society today? Computers have taken over today ’s society. From everyday tasks to moving satellites in space‚ PCs have revolutionized almost everything in our society. Computers weren ’t always this complicated though‚ and were around a long time before anyone even knew what the word "computer" meant. The Abacus was the first known machine developed to help perform mathematical equations. From what researchers
Premium Computer Personal computer Vacuum tube