- 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.
Ore deposits are naturally occurring geologic bodies that may be worked for one or more metals. The metals may be present as native elements, or, more commonly, as oxides, sulfides, sulfates, silicates, or other compounds. The term ore is often used loosely to include such nonmetallic minerals as fluorite and gypsum. The broader term, mineral deposits, includes, in addition to metalliferous minerals, any other useful minerals or rocks. Minerals of little or no value which occur with ore minerals are called gangue. Some gangue minerals may not be worthless in that they are used as by-products; for instance, limestone for fertilizer or flux, pyrite for making sulfuric acid, and rock for road material.
Industry:Science
In September of 2007, bluetongue infection in a cow was reported for the first time in the United Kingdom on a farm near Ipswich, Suffolk. Within a short time, three more cases were identified and the animals destroyed. Soon after, however, the rising number of cases made it obvious that the virus was present in the insect population and was asymptomatic in other cattle. At that point, the government stopped the slaughter of cows while setting up “protection zones,” areas where the movement of cattle and sheep are restricted due to potential for disease spread. The bluetongue virus has spread northward into Europe from the Middle East and Africa, yet another warning sign of the effects of global warming.
Industry:Science
Investigation of the universe by probing the electromagnetic spectrum at wavelengths from approximately 0.3 to 1.0 millimeter: the submillimeter waveband. This waveband is bounded at longer wavelengths by the millimeter waveband (1– 10 mm), and at shorter wavelengths by the far-infrared waveband (20–300 micrometers). Obtaining an accurate view of the processes going on in stars and galaxies requires observations at a range of different wavelengths, with each available window providing complementary information. Astronomical objects with temperatures between about 10 kelvins and several hundred kelvins, typically in the interstellar medium of galaxies, emit radiation strongly in the submillimeter waveband.
Industry:Science
Movement is a fundamental property of life. Most forms of movement that we encounter in the living world—be it the transport of a tiny vesicle or the swimming of a whale—have a common molecular basis. They are generated by motor proteins that use the energy derived from the hydrolysis of adenosine triphosphate (ATP) to take nanometer-scale steps along a cellular track. Their actions power the movements we see, involving possibly just a single motor molecule in the case of the vesicle and phenomenally large arrays of billions and billions of motors in the case of the whale. Understanding the molecular basis of the behavior of these molecules is a prerequisite to understanding cellular and organismal motion.
Industry:Science
One week after the attack on the World Trade Center on September 11, 2001, powdered anthrax spores were sent through the public mail system to addresses in the United States, resulting in 22 cases of anthrax with 5 deaths. This act of bioterrorism was perpetrated using letters addressed to public media headquarters, including the major television networks. The first letters were followed a few weeks later by letters sent to the offices of senators Thomas Daschle of South Dakota and Patrick Leahy of Vermont. The infections and deaths sent a wave of fear throughout the American public, and the investigation that followed has yet to lead to conclusive results about the perpetrator(s) of this act of terrorism.
Industry:Science
Low-frequency sound waves that cannot be sensed by the human ear. Infrasound was first detected on barometers around the world following the eruption of the volcano Krakatoa in 1883. We now know subaudible sounds are generated by a wide variety of natural phenomena, such as large storms and meteors, and some human-produced sources, such as large chemical or nuclear explosions. Infrasound is particularly useful for basic research, for example, in the study of atmosphere phenomena; as it decays slowly across thousands of kilometers. How infrasound is generated, how it propagates through our turbulent atmosphere, and how it can be recorded amid noise due to air circulation are the subjects of ongoing research.
Industry:Science
Large systems that are formed from a variety of component systems: custom systems, which are newly engineered from the “ground up;” existing commercial-off-the-shelf (COTS) systems that are subsequently tailored for a particular application; and existing or legacy systems. Such related terms as systems of systems (SOS), federations of systems (FOS), federated systems of systems (F-SOS), and coalitions of systems (COS) are often used to characterize these systems. These appellations capture important realities brought about by the fact that modern systems are not monolithic. Rather, they have five characteristics, initially summarized by Mark Maier, that make one of the system family designations appropriate:
Industry:Science
Most organizations depend on the effective integration of a number of systems in order to quickly adapt to changes of all types, such as changing technology, changing customers and customer needs, and changing business partners. To accomplish this, an organization's systems must form an enterprise architecture that is in effect a system of systems (SOS) or systems family. The perspectives of all the stakeholders, from the chief executive to the technology developer to various implementation contractors, must be considered in developing the architecture. The systems that constitute the system family must be evolvable and adaptive in order to enhance the ability of the organization to cope with emerging needs.
Industry:Science
One of the fundamental physical interactions, which acts between a pair of hadrons. Hadrons include the nucleons, that is, neutrons and protons; the strange baryons, such as lambda (Λ) and sigma (Σ); the mesons, such as pion (π) and rho (ρ); and the strange meson, kaon (<i>K</i>). The nature of the interaction is determined principally through observations of the collision of a hadron pair. From this it is found that the interaction has a short range of about 10<sup>−15</sup> m (10<sup>−13</sup> in.) and is by far the dominant force within this range, being much larger than the electromagnetic interaction, which is next in magnitude. The strong interaction conserves parity and is time-reversal-invariant.
Industry:Science
Piezoelectric drop-on-demand (DOD) inkjet technology is most often selected form anufacturing processes such as printing electronic components (resistors and capacitors) and circuit board materials (solder, solder mask, and conductive traces). Piezoelectric DOD printheads offer the critical combination of high productivity, high reliability, and uniform characteristics (such as drop volume consistency, velocity characteristics, and jet straightness) for jetting materials dissolved or dispersed in organic or aqueous media. In recent years, it has proved possible to design and manufacture highly productive and reliable printheads which meet the exacting dispensing requirements in flat-panel display manufacturing.
Industry:Science
