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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 Camel
Bactrian camel (Camelus bactrianus). (Photo courtesy of Brent Huffman, Ultimate Ungulate Images)
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from article Plant communication
Hillsides in central California covered by hard chaparral composed almost entirely of chemise shrubs. Chemise (also spelled chamise) produces allelopathic chemicals that, through plant communication, inhibit the germination of seeds and the…
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from article Soil
Soil supports plant growth. A pumpkin seed in nutritious soil sprouts and comes to life. (Credit: Redmal/Getty Images)
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from article Soil
A soil profile showing horizons. This particular soil belongs to the Dothan series of soils, which are very deep, well drained soils that form in thick beds of unconsolidated, medium- to fine-textured marine sediments. (Credit: John A. Kelley,…
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from article Soil
Erosion is an important concern of soil management. The soil along the river bank has eroded significantly, causing riparian trees to fall. (Credit: Hans Engbers, Shutterstock)
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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 Territoriality
The tiger (Panthera tigris) is highly territorial in its behavior. (Credit: Safique Hazarika Photography/Getty Images)
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from article Ecological competition
The competitive exclusion principle can be prevented through resource partitioning and species coexistence. In this illustration, each warbler species prefers to feed at a different height and portion of the tree, thus reducing competition.…
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from article Biosphere
All environments capable of sustaining life above, on, and beneath the Earth's surface, as well as in the oceans, are contained in the biosphere. (Credit: National Aeronautics and Space Administration)
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from article Biosphere
The upper and lower limits of the biosphere are not sharply defined. However, most of the biosphere lies within the zone that is reached by sunlight and where liquid water exists. The mountains shown in this photograph are located in Torres del…
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from article Predator-prey interactions
A predatory panther chameleon (Furcifer pardalis) is preying upon a cricket. (Credit: Cathy Keifer/Shutterstock)
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from article Predator-prey interactions
Predator-prey interactions play important roles in explaining the population dynamics of many species. In this photograph, a cheetah (Acinonyx jubatus) is hunting a springbok (Antidorcas marsupialis) in Namibia. (Credit: Elana Erasmus/Shutterstock)
