- 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.
The idea that everything is made from a few basic elements originated in ancient Greece. In the nineteenth century the elementary pieces of matter were the atoms of the chemical elements, but in the first half of the twentieth century atoms were found to be compounds of electrons, protons, and neutrons. These became known as elementary particles, that is, particles that are not compounds of other particles.
Industry:Science
The branch of analytical chemistry that deals with the determination of the relative or absolute amounts of the various constituents of materials.
Industry:Science
Stroboscopic or “strobe” photography generally refers to pictures of both single and multiple exposure taken by flashes of light from electrical discharges. Originally the term referred to multiple-exposed photographs made with a stroboscopic disk as a shutter. One essential feature of modern stroboscopic photography is a short exposure time, usually much shorter than can be obtained by a mechanical shutter.
Industry:Science
The area of plant science concerned with the internal structure of plants. It deals both with mature structures and with their origin and development.
Industry:Science
The formation of a solid from a solution, melt, vapor, or a different solid phase. Crystallization from solution is an important industrial operation because of the large number of materials marketed as crystalline particles. Fractional crystallization is one of the most widely used methods of separating and purifying chemicals. This article discusses crystallization of substances from solutions and melts.
Industry:Science
The cephalopod subclass in the phylum Mollusca that includes living octopods, squids, cuttlefish, and sepiolids (bob-tail squids), and the extinct belemnites.
Industry:Science
The conversion of electromagnetic radiation into electric power through absorption by a semiconducting material. Devices based on this effect serve as power sources in remote terrestrial locations and for satellites and other space applications. Photovoltaic powered calculators and other consumer electronic products are widely available, and solar photovoltaic automobiles and aircraft have been demonstrated.
Industry:Science
The most common sulfate mineral, characterized by the chemical formula CaSO<sub>4</sub> · 2H<sub>2</sub>O; it shows little variation from this composition.
Industry:Science
Stroboscopic photography for depicting the changing features of subjects in motion is a technique that was enabled by one of the inventors of high-speed photography, Harold Edgerton. He applied this technique to numerous situations where a still camera (in a single shot) did not capture enough information about a subject in motion and where a motion picture camera's record was unsuitable for print reproduction.
Industry:Science
The discipline of acoustic phonetics can be narrowly defined as the study of the acoustic output of the vocal tract for speech, but ultimately it encompasses much more. Acoustic phonetics makes direct contact with, and in many cases is the foundation of, areas of study such as speech synthesis, automatic (computer) recognition of speech, speech perception, phonological analysis and theory, and speech pathology.
Industry:Science
