- 行业: Printing & publishing
- Number of terms: 178089
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- Company Profile:
McGraw Hill Financial, Inc. is an American publicly traded corporation headquartered in Rockefeller Center in New York City. Its primary areas of business are financial, publishing, and business services.
Any star whose spectrum shows a higher abundance of carbon than of oxygen. The carbon enhancements are easily recognizable from strong spectral absorption bands of carbon in molecular forms such as C<sub>2</sub>, CN, and CH. Many types of carbon star are known, covering a wide variety of masses, temperatures, abundances, and luminosities. The cool red appearance, high luminosity, and intrinsic variability of bright carbon stars show that they are giant stars.
Industry:Science
Electrical polarity in a biological material produced by a change in temperature. Pyroelectricity is probably a basic physical property of all living organisms. First discovered in 1966 in tendon and bone, it has since been shown to exist in most animal and plant tissues and in individual cells. Pyroelectricity appears to play a fundamental part in the growth processes (morphogenesis) and in physiological functions (such as sensory perception) of organisms.
Industry:Science
As the most Earth-like planet in the solar system, Mars is a subject of fascination and intense study. A primary objective of the <i>Viking</i> missions to Mars completed in the mid-1970s was to search for evidence of life. The landers detected extraordinary chemical reactivity in the Martian soil, but no organic material. Numerous theories, none universally accepted, explain the <i>Viking</i> results, usually invoking an inorganic oxidant in the Martian soil.
Industry:Science
Images are used in forensic applications to document the condition of crime scenes and evidentiary items in the laboratory. In some cases the images themselves are the evidence, such as bank surveillance film. Digital imaging technologies are extending, and in many cases improving upon, the capabilities of traditional silver-based film techniques through processing and analysis techniques that can enhance the images and extract additional information from them.
Industry:Science
Chemical compounds biosynthetically or synthetically produced which either destroy or usefully suppress the growth or metabolism of a variety of microscopic or submicroscopic forms of life. On the basis of their primary activity, they are more specifically called antibacterial, antifungal, antiprotozoal, antiparasitic, or antiviral agents. Antibacterials which destroy are bactericides or germicides; those which merely suppress growth are bacteriostatic agents.
Industry:Science
Collisions between heavy atomic nuclei at relative velocities close to the speed of light. These high-energy nuclear collisions are usually divided into two different domains, relativistic and ultrarelativistic collisions, depending on whether the kinetic energy per nucleon (the generic name for protons and neutrons) is either close to the rest mass of the nucleon (relativistic collisions) or much larger than the nucleon rest mass (ultrarelativistic collisions).
Industry:Science
Devices consisting of a conductor heated by an electric current, with one or more hot junctions of a thermocouple attached to it, so that the output emf responds to the temperature rise, and hence the current. Thermal converters are used with external resistors for alternating-current (ac) and voltage measurements over wide ranges and generally form the basis for calibration of ac voltmeters and the ac ranges of instruments providing known voltages and currents.
Industry:Science
Classically, a mechanical means for the conversion of motion, the transmission of power, or the control of these. Mechanisms are at the core of the workings of many machines and mechanical devices. In modern usage, mechanisms are not always limited to mechanical means. In addition to mechanical elements, they may include pneumatic, hydraulic, electrical, and electronic elements. In this article, the discussion of mechanism is limited to its classical meaning.
Industry:Science
Fiber steering is an emerging design concept for advanced fiber-reinforced composite materials and structures. Steered-fiber architecture has the potential to offer significant weight savings over conventional composite materials by improving tailoring of local fiber orientation to the specific internal load path of a structure. Increased complexity in fabrication of steered-fiber composites can now be handled easily by existing automated manufacturing techniques.
Industry:Science
Any of a variety of distinct sediment laminations or beds deposited within the span of a single year. They are formed commonly in saline or fresh-water lakes, but examples from marine environments are known as well. Usually, varves occur in repetitive series and thus comprise vertical sequences of annual cyclic deposits. Varves range in thickness from less than a millimeter (0.04 in.) to over a meter (3 ft), but typically are a few millimeters or centimeters thick.
Industry:Science
