- 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.
As a structural material, a burned clay product in which the coring exceeds 25% of the gross volume; as a facing material, any thin, usually flat, square product. Structural tile used for load bearing may or may not be glazed; it may be cored horizontally or vertically. Two principal grades are manufactured: one for exposed masonry construction, and the other for unexposed construction. Among the forms of exposure is frost; tile for unexposed construction where temperatures drop below freezing is placed within the vapor barrier or otherwise projected by a facing in contrast to roof tile.
Industry:Science
Filamentous fungi that reproduce asexually by making spores inside microscopic fruiting bodies. Estimates of the number of genera range up to 1000, with the number of species between 7000 and 10,000. They are especially numerous on living or decomposing plants, but they can occur on several other substrata. Many are plant pathogens. A few have been isolated in clinical or veterinary settings. Although all members of the group reproduce asexually by making their spores (conidia) via mitosis, some species also have known sexual states (teleomorphs) which produce spores via mating and meiosis.
Industry:Science
Grasses and legumes that make up grasslands and are used as forages for livestock. The grasslands represent an ancient renewable natural resource. They form 25% of the world's vegetation and occupy the largest area of any single plant type. They benefit humanity indirectly by providing food for both wild animals and domesticated livestock, some of which are ruminants that, because their digestive systems contain microorganisms, are able to digest fibrous forage material. Thus, the prime value of grassland areas lies in the meat, milk, or work produced by the livestock that graze on them.
Industry:Science
Community genetics looks at how genetic variation within a species, or group of species, changes other species in an ecosystem or the ecosystem as a whole. These changes can involve species presence or abundance; the behavior, physiology, or evolution of a species; or the rates of ecosystem processes. The question at the core of community genetics is “How do genotypes differentially influence associated species and ecosystems?” Community genetics takes ideas from population genetics and community ecology, and in so doing provides a way of integrating the disciplines of ecology and evolution.
Industry:Science
Biocatalysis refers to the use of isolated enzymes or whole cells as catalysts for the synthesis of organic molecules. Enzymes are protein catalysts that accelerate chemical transformations inside a living organism. As essential components of all living systems, they catalyze the chemical transformations in cellular metabolism and are responsible for the creation of a large number and many types of molecules required for life. Biocatalysis, by exploiting nature's catalysts, offers exciting opportunities to capture nature's enormous catalytic power and synthetic diversity in chemical synthesis.
Industry:Science
Classical theories on the strength of solids, based on fracture mechanics or maximum stress, assume a continuum. Even if this robust hypothesis has been demonstrated to work at the nanoscale for elastic calculations, it has to be revised for computing the strength of nanostructures or nanostructured materials. Accordingly, quantized strength theories recently have been formulated and validated by atomistic and quantum-mechanical calculations or nanotensile tests. As an example, we will discuss the implications on the strength prediction for the carbon nanotube-based space elevator's megacable.
Industry:Science
Concerted (single-step) processes in which bond making and bond breaking occur simultaneously (but not necessarily synchronously) via a cyclic (closed-curve) transition state. Although a given reaction may appear formally to be pericyclic, it cannot be assumed to be a concerted process. In each case, the detailed mechanism of the reaction must be established experimentally. Pericyclic reactions can be promoted either by heat or by light; the stereochemistry of the reaction is determined by the mode of activation employed and the number of electrons that are delocalized in the transition state.
Industry:Science
Glaciers form, advance, recede, and disappear in response to changing climate patterns. Alpine glaciers show the most direct response to climatic change of any surface phenomena in the mountains. This is apparent in the Sierra Nevada of California, where several small glaciers of less than 1 km<sup>2</sup> (0.386 mi<sup>2</sup>) exist under marginal conditions. Unlike larger ice masses, such as those in Alaska, which may typically display lag times of years or even decades in response to changes in climate, these glaciers respond rapidly, often showing measurable differences on a yearly basis.
Industry:Science
Bipolar disorder, also known as manic-depressive illness, is an episodic but lifelong mental disorder. The first recognizable descriptions of mania and depression date back to the writings of Aretaeus of Cappadocia (a Greek physician who lived around 150–200 <small>c.e.</small>). The modern history of bipolar disorder begins in the midnineteenth century with the concept of <i>folie circulaire</i> (“circular insanity”) proposed by the French psychiatrist Jean-Pierre Falret. Later, it was defined by the work of the German psychiatrist Emil Kraepelin, around the beginning of the twentieth century.
Industry:Science
For the first 100 years of telephony, each telephone required a wire from the home or office to a central location in the telephone network (the central office). After radio was invented, car telephones became available, but only since the early 1980s could large numbers of people have car telephones, now called cellular phones. In the 1990s, there has been an explosion in wireless communications. Wireless technology has expanded from high-tier systems for vehicles and individuals to low-tier systems for the home and office. The design of high-tier systems differs from that of low-tier systems.
Industry:Science
