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    Gunns Case Study

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    Samuel‚ Delyth. 2010. Gunns and the Australian pulp and paper manufacturing industry. University of Melbourne. Sonnefeld‚ David. 1999. Social Movements and Ecological Modernisation. The transformation of pulp and paper manufacturing. University of California. Development and Change. Volume 33‚ Issue 1. Pg 12 Campbell‚ R‚ 2012 D‚ Samuel‚ 2010‚ Gunns and the Australian pulp and paper manufacturing industry. University of Melbourne Gale‚ F‚ 2008‚ ‘Tasmania ’s Tamar Valley Pulp’‚ Vol Gunns Limited‚ Annual

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    Diode

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    A diode is a two-terminal device‚ having two active electrodes‚ between which it allows the transfer of current in one direction only. Diodes are known for their unidirectional current property‚ wherein‚ the electric current is allowed to flow in one direction. Basically‚ diodes are used for the purpose of rectifying waveforms‚ and can be used within power supplies or within radio detectors. They can also be used in circuits where ’one way’ effect of diode is required. Most diodes are made from semiconductors

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    Diodes

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    the first type of semiconductor diode‚ and in fact‚ the first semiconductor electronic device. Cat’s whisker detectors are obsolete and are now only used in antique or antiquereproduction radios‚ and for educational purposes. Tunnel diode From Wikipedia‚ the free encyclopedia Tunnel diode schematic symbol 1N3716 tunnel diode (with 0.1" jumper for scale) 10mA germanium tunnel diode mounted in test fixture of Tektronix 571 curve tracer A tunnel diode or Esaki diode is a type of semiconductor that

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    Diode Transistor

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    bipolar (discussed later in this chapter). Let’s analyze this circuit for the condition where the input is "high‚" or in a binary "1" state. We can simulate this by showing the input terminal connected to Vcc through a switch: In this case‚ diode D1 will be reverse-biased‚ and therefore not conduct any current. In fact‚ the only purpose for having D1 in the circuit is to prevent transistor damage in the case of a negative voltage being impressed on the input (a voltage that is negative‚ rather

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    Silicon Diode

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    that element. 2) A conducting germanium diode has a potential of about 0.7 V across it. 3) Silicon doped with impurities is used in the manufacture of semiconductor devices. 4) Reverse bias permits full current through a pn junction. 5) Semiconductor material of the p-type has few free electrons. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 6) The application of a dc voltage to control diode conduction is called A) a pn junction.

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    Diode Applications

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    Diodes‚ which are integral components in almost all electronic devices‚ are essentially two pin semiconductor devices which possess the ability to conduct current unidirectionally. Diodes are highly versatile and find numerous applications in various disciplines. Some of the noteworthy applications of Diodes include 1. Rectification 2. Wave Shaping 3. Frequency Multiplier Circuits 4. Voltage Multiplier Circuits 5. Signal Mixers 6. Switches 7. Tuning Let us examine each of these applications

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    Tunnel Diode

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    III.8. THE TUNNEL DIODE 1. Theory The Japanese physicist Leo Esaki invented the tunnel diode in 1958. It consists of a p-n junction with highly doped regions. Because of the thinness of the junction‚ the electrons can pass through the potential barrier of the dam layer at a suitable polarization‚ reaching the energy states on the other sides of the junction. The current-voltage characteristic of the diode is represented in Figure 1. In this sketch i p and U p are the peak‚ and iv and U v are

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    shottky diode

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    Session 1999 WHAT IS A SCHOTTKY DIODE? The Schottky diode is an important device which is widely used in radio-frequency (RF) applications. It possesses many similarities to the point-contact diode. In fact many of the early devices were made in the same way as a point-contact diode‚ although today’s devices are made with totally different manufacturing techniques. Unlike conventional semiconductor diodes‚ which consist of a PN junction‚ the Schottky diode is made from a metal semiconductor

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    Zener Diodes

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    1N4728A - 1N4758A — Zener Diodes April 2009 1N4728A - 1N4758A Zener Diodes Tolerance = 5% DO-41 Glass case COLOR BAND DENOTES CATHODE Absolute Maximum Ratings * Symbol PD Ta = 25°C unless otherwise noted Parameter Power Dissipation @ TL  50C‚ Lead Length = 3/8” Derate above 50C Value 1.0 6.67 -65 to +200 Units W mW/C C TJ‚ TSTG Operating and Storage Temperature Range * These ratings are limiting values above which the serviceability of the diode may be impaired. Electrical Characteristics

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    Forward biased diode: cathode anode Varactor is a silicon diode optimized for its variable capacitance when reversedbiased. Used for tuning frequencydependent equipment. Zener Diode is designed to operate in the breakdown region; used for voltage regulation. Varactor Zener N + P electron flow depletion layer An ideal diode acts like a closed switch when forward biased and an open switch when reverse biased. 1st approximation calculations assume an ideal diode. 2nd approximation

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