- 行业: Printing & publishing
- Number of terms: 178089
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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.
Formerly called natural philosophy, physics is concerned with those aspects of nature which can be understood in a fundamental way in terms of elementary principles and laws. In the course of time, various specialized sciences broke away from physics to form autonomous fields of investigation. In this process physics retained its original aim of understanding the structure of the natural world and explaining natural phenomena.
Industry:Science
Any of various methods for determining the oxygen saturation of blood. Oximeters are instruments that measure the saturation of blood in arteries by transilluminating intact tissue, thus eliminating the need to puncture vessels. Aside from the major advantage of being noninvasive and therefore free of risk, oximeters permit long-term monitoring in a variety of clinical settings, giving a continuous record of oxygen saturation.
Industry:Science
Conjugated polymers and molecules with semiconducting properties exhibit a high potential for use in fabricating efficient and low-cost flexible photovoltaic devices or solar cells, possibly for large-area applications. One important advantage of polymer semiconductors over their inorganic counterparts is that they can be dissolved and applied as a solution by techniques such as spin coating, doctor blading, and screen printing.
Industry:Science
Despite the importance of human seafaring in the history of global colonization, archeologists are uncertain about how, why, and when humans first began to use boats. Physical evidence for boats in the archeological record is sparse and late in time, and our understanding of seafaring is derived from dated archeological remains of earliest human occupation recovered from regions that could have been reached only via sea crossings.
Industry:Science
During late April and May of 2001 and 2002, the bluegrass area in the central part of Kentucky experienced an epidemic of equine abortions. Early fetal loss (days 35–100 of gestation) and late-term abortion occurred in recently bred mares and mares nearing foaling, respectively. These losses have been termed mare reproductive loss syndrome (MRLS). For the period, estimates placed the economic loss due to MRLS at over $330 million.
Industry:Science
Combinations of zinc with one or more other metals. If zinc is the primary constituent of the alloy, it is a zinc-base alloy. Zinc also is commonly used in varying degrees as an alloying component with other base metals, such as copper, aluminum, and magnesium. A familiar example of the latter is the association of varying amounts of zinc (up to 45%) with copper to produce brass, the third largest use of zinc in the United States.
Industry:Science
Any member of a class of intensely colored pigments found in some algae that absorb light for photosynthesis. Phycobilins are open-chain tetrapyrroles structurally related to mammalian bile pigments, and they are unique among photosynthetic pigments in being covalently bound to proteins (phycobiliproteins). In at least two groups of algae, phycobiliproteins are aggregated in a highly ordered protein complex called a phycobilisome.
Industry:Science
Any virus of the herpesvirus group, which comprises a family of 70 species, 5 of which are pathogenic to humans; the term also refers to any infection caused by these viruses. Since these pathogens are ubiquitous in nature, most individuals of all populations are exposed to and thus immunized to these viruses. The five pathogenic groups include herpes simplex I and II, varicella-zoster, cytomegalovirus, and the Epstein-Barr virus.
Industry:Science
Defined primarily by climatic rather than latitudinal criteria, arctic islands are those in the Northern Hemisphere where the mean temperature of the warmest month does not exceed 50°F (10°C) and that of the coldest is not above 32°F (0°C). Subarctic islands are those in the Northern Hemisphere where the mean temperature of the warmest month is over 50°F (10°C) for less than 4 months and that of the coldest is less than 32°F (0°C).
Industry:Science
Digital broadcasting of television signals offers advantages over the usual analog methods: enhanced picture and sound quality, ability to transmit higher-resolution and wide-screen images, and new opportunities for interactive television services. This article discusses the principles of digital video broadcasting and its worldwide implementation, and the digital television broadcasting system that is planned for the United States.
Industry:Science
