- 行业: Printing & publishing
- Number of terms: 178089
- Number of blossaries: 0
- 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.
One of the condensation products of phenols or phenolic derivatives with aldehydes such as formaldehyde and furfural. The term phenoplasts is sometimes used to refer to the whole group of products. The phenol-formaldehyde resins, developed com- mercially between 1905 and 1910, were the first truly synthetic polymers and have found wide usage for electrical insulation, molded objects, shell molds for metals, laminates, adhesives, and many other applications. They are characterized by low cost, dimensional stability, high strength, and resistance to aging. The combination of low cost and good properties is reflected in the fact that phenolic resins are produced in greater volume than any other thermosetting resin.
Industry:Science
Reference printing conditions provide the interface between design, printing data preparation, proofing, and printing and define the intended relationship between data in a computer and color on a printed sheet, regardless of the printing process used. Symbolically, reference printing conditions represent the transition of the printing industry from a craft-based and nonstandardized film environment in the late 1970s to today's digital-data–based and standardized manufacturing process. This has been truly a revolution in which computer capability, digital data storage capability, standards, and cooperation among industry associations have worked together to change the basic philosophy of printing and publishing.
Industry:Science
One of the two plant subkingdoms, the other being the Thallobionta. The Embryobionta (often also called Embryophyta) form a well-marked group with many morphological, anatomical, and physiological features in common, and taxonomists are agreed that the Embryobionta as a group are derived from the division Chlorophyta (green algae) in the subkingdom Thallobionta. The Embryobionta are here considered to include eight divisions, the Rhyniophyta, Bryophyta, Psilotophyta, Lycophyta, Spenoophyta, Polypodiophyta, Pinophyta, and Magnoliophyta. The Rhyniophyta are represented only by Paleozoic fossils, but the other seven divisions have both modern and fossil representatives. See the separate articles on each division.
Industry:Science
Recent advances in laser and electrooptical technology have made it possible to directly observe the motion of electrons within atoms. Specifically, because of the development of ultrashort laser pulses with durations of less than 100 femtoseconds (1 fs = 10<sup>−15</sup> s), instruments can be created that act as cameras with extremely fast shutters to view electrons as they move about the nucleus. In addition, these same laser pulses can be used to alter the distribution of electronic charge about the atom to take on a particular configuration at a specified time. This type of control over charge distributions may eventually make it possible to alter the outcome of chemical reactions between atoms and molecules.
Industry:Science
Medical examiner/coroner's (ME/C) offices investigate about 20% of the approximately 2.5 million deaths that occur in the United States each year. A medicolegal jurisdiction refers to either a county's medical examiner's or coroner's office. There are an estimated 500,000 deaths reported to medicolegal jurisdictions annually in the United States' 3137 counties. All 50 states, four territories, and the District of Colombia differ from one another with regard to their medicolegal system (medical examiner or coroner), statutory authority, resources, and interagency cooperation. Deaths reportable to a medical examiner's or coroner's office usually fall into the categories of violent, suspicious, sudden, and unexpected.
Industry:Science
Industrial processes in chemical engineering or laboratory operations in which heat or mass or both are transferred from one fluid to another, with the fluids moving continuously in very nearly steady state or constant manner and in opposite directions through the unit. Other geometrical arrangements for transfer operations are the parallel or concurrent flow, where the two fluids enter at the same end of the apparatus and flow in the same direction to the other end, and the cross-flow apparatus, where the two fluids flow at right angles to each other through the apparatus. These two arrangements are ordinarily not as efficient as countercurrent flow, but do find certain applications in industry and the laboratory.
Industry:Science
Infectious pathogens have undoubtedly been a significant factor throughout the evolutionary history of humans, causing illness and death. It is equally certain that exposure to infectious agents and illness from infection became a more serious problem for human groups during the past 10,000 years. During this period animals and plants were domesticated, giving rise to an agricultural economy that provided the resources that stimulated sedentism and urbanism to become important environmental realities in human life. The risk of infectious disease was enhanced by exposure to pathogens carried by domestic animals (zoonoses) as well as increased human-to-human transmission of pathogens in larger concentrations of people.
Industry:Science
Physical measurements depend on an evolving structure of base units, algorithms for their realization, and recommended procedures that constitute the International System of Units (SI). Until the second half of the twentieth century, most such base units were defined in terms of specific physical artifacts. These units entered the measurement process by means of replicas of the primary artifacts. Much work has been done to replace these artifact standards by invariant alternatives, such as atomic transition frequencies and fundamental physical constants. Only the base unit of mass remains defined by an artifact. Efforts involving atom counting and electromagnetic force generation may provide an invariant replacement.
Industry:Science
Plants of the legume family used for livestock feed, grazing, hay, or silage. Legume forages are usually richer in protein, calcium, and phosphorus than other kinds of forages, such as grass. The production, preservation, and use of forage legumes require special skills on most soils. One important requirement is a supply of the needed symbiotic nitrogen-fixing bacteria if these are not already in the soil commercial cultures for various strains of these bacteria can be purchased and applied to the legume seed just before planting. Additional lime and commercial fertilizers may be needed on all except fertile soils. Protection from weeds, injurious insects, diseases, and other harmful influences is often required.
Industry:Science
Solar activity is all forms of phenomena associated with the “active regions” on the Sun, which are associated with sunspots. Examples of solar activity are coronal mass ejections, flares, the 11-year-period solar cycle, energetic particles, and geomagnetic storms. Solar activity, although virtually impossible to forecast a month in advance, has succumbed to scientific methods on long time scales, much as seasonal climate forecasts are possible but weather forecasts beyond about 14 days are not. Moderately accurate solar activity forecasts on decadal time scales now seem possible. The workable methods fall into a class of prediction techniques called precursor methods, which have proved successful for two solar cycles.
Industry:Science
