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from article Computer virus
Some viruses are more destructive than others, causing devastation or theft of data. (Credit: iStockphoto.com/Zmeel Photography)
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from article Computer virus
Purposes for creating viruses.
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from article Computer virus
Daily virus threats experienced by large organizations.
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from article Computer virus
Examples of vulnerabilities to computer viruses.
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from article Computer programming
Program code. (Credit: Max Delson Martins Santos/Getty Images)
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from article Teleconferencing
A typical teleconference. (Courtesy of Lifesize, www.lifesize.com)
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from article WiMAX broadband wireless communications
Fixed and mobile WiMAX services.
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from article WiMAX broadband wireless communications
WiMAX Advanced Antenna Systems (AAS) using multiple-input techniques. (a) Increased robustness using multiple input–single output (MISO). (b) Increased capacity using multiple input–multiple output (MIMO).
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from article Touch-screen display
Doctor using a touch-screen tablet. (Credit: John Lamb/Getty Images)
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from article Touch-screen display
Capacitive touch sensor. (a) A single electrode is brought to a potential +V, and the resulting charge accumulated is recorded and determines the capacitance of the electrode. (b) The electrode is still held at potential +V, but because of the…
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from article Touch-screen display
In mutual capacitance sensing, two electrodes are used. The potential difference between them is changed by a small amount dV, and the resulting change of charge on one of them is examined. In the presence of a finger, this amount of charge differs,…
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from article Touch-screen display
Optical-over-the-display method. (a) Two cameras are inspecting the surface parallel to the display, while 18 light sources are distributed around the edges. Each camera in this specific scenario has a view of 12 of the light sources. (b) Once a…
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from article Touch-screen display
Optical-in-the-display method. Looking through a cross section of the cover glass on the display, we see one light source launching light into the glass, which serves as a waveguide. When the finger touches the glass, some of the light leaks…
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from article Touch-screen display
Resistive method. (a) Cross section of typical resistive sensor. Two conductive layers are laminated on transparent material (glass, clear plastic, or a similar material), and are kept with a small space between them (usually about 40 μm). (b)…
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from article Switching circuit
Elementary combinational switching circuit.
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from article Switching circuit
Typical switching gates using crystal diodes.
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from article Switching circuit
Elementary sequential relay switching circuit.
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from article Switching circuit
Transistor switching memory element (flip-flop).
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from article Switching circuit
Matrix selecting circuit using AND gates.
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from article Switching circuit
Connecting circuit using AND and OR gates.
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from article Switching circuit
Lockout circuit using cold-cathode gas tubes.
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from article Switching circuit
Code register and translating circuit using magnetic cores, each of which has five windings.
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from article Switching circuit
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from article Antenna (electromagnetism)
Various types of antennas. (a) Top-loaded vertical mast; (b) center-fed horizontal antenna; (c) horn radiator; (d) paraboloidal reflector with a horn feed; (e) corrugated-surface wave system for end-fire radiation; (f) zoned dielectric lens with a…
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from article Antenna (electromagnetism)
Spherical coordinate system for an electric dipole.
