- 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.
A ship which can operate completely submerged in the water. The term formerly applied to any ship capable of operating completely underwater, but now usually describes a ship built for military purposes. The term “submersible” usually is applied to small, underwater vehicles that are built for research, rescue, commercial work, or pleasure.
Industry:Science
A short auxiliary scale placed along the main instrument scale to permit accurate fractional reading of the least main division of the main scale, invented by Pierre Vernier about 1630. The auxiliary, or vernier, scale is graduated in one or both directions from the fiducial (index) mark in numbered divisions which are fractionally shorter (in a direct vernier) or longer (in a retrograde vernier) than those on the main scale. The position of the fiducial mark (the zero mark of the vernier scale) between divisions on the main scale is indicated by the number of the graduation on the vernier scale which lines up exactly with a graduation on the main scale.
Industry:Science
A short rod with a head formed on one end. A rivet is inserted through aligned holes in two or more parts to be joined; then by pressing the protruding end, a second head is formed to hold the parts together permanently. The first head is called the manufactured head and the second one the point. In forming the point, a hold-on or dolly bar is used to back up the manufactured head and the rivet is driven, preferably by a machine riveter. For high-grade work such as boiler-joint riveting, the rivet holes are drilled and reamed to size, and the rivet is driven to fill the hole completely. Structural riveting uses punched holes.
Industry:Science
A short-period oscillation in an enclosed or semienclosed body of water, analogous to the free oscillation of water in a dish. The initial displacement of water from a level surface can arise from a variety of causes, and the restoring force is gravity, which always tends to maintain a level surface. Once formed, the oscillations are characteristic only of the geometry of the basin itself and may persist for many cycles before decaying under the influence of friction. The term “seiche” appears to have been first used to describe the rhythmic oscillation of the water surface in Lake Geneva, which occasionally exposed large areas of the lake bed that are normally submerged.
Industry:Science
A short-range air navigation aid, which provides azimuth aid by visual means of cockpit instruments. A VOR system provides properly equipped aircraft with bearing information relative to the VOR station and magnetic north. The VOR system is used for landing, terminal, and en route guidance. It also gives virtually static-free regular weather broadcasts, special flight instructions, and voice and code station identification. The VOR service operates in the very high frequency (VHF) band between 108 and 118 MHz, sharing alternate channels with the localizer in the instrument landing system. Typically, VOR stations are co-located with a distance measuring equipment (DME) system or a tactical navigation (TACAN) system. The combined systems are referred to as VOR/DME or VORTAC stations and provide both azimuth and distance information.
Industry:Science
A shrubby perennial plant in the genus <i>Salvia</i> of the mint family (Limiaceae). There are several species, including garden, or true, sage (<i>S. officinalis</i>), the sage most commonly used in foods. Many varieties of garden sage are known, but the Dalmatian type possesses the finest aroma. Mediterranean, or Greek, sage (<i>S. fructicosa</i>) is also used in foods, but is of inferior quality. Clary sage (<i>S. sclarea</i>) and Spanish sage (<i>S. lavandulifolia</i>) are used in perfumes and cosmetics.
Industry:Science
A significant but relatively selective inability to remember. Amnesia can be characterized along two dimensions with respect to its onset: an inability to remember events that occurred after the onset of amnesia is referred to as anterograde amnesia, and a deficit in remembering events that occurred prior to the onset of amnesia is referred to as retrograde amnesia. Amnesia can be due to a variety of causes, or etiologies, and it can be classified according to whether the cause is primarily neurological or psychological in origin.
Industry:Science
A silicate mineral with composition essentially (Cu,Al)<sub>2</sub>H<sub>2</sub>Si<sub>2</sub>O<sub>5</sub>(OH)<sub>4</sub>·<i>n</i>H<sub>2</sub>O; iron, and more rarely manganese, may substitute for copper. Although acicular monoclinic crystals have been reported, the wide variation in the composition of analyzed specimens suggests that chrysocolla is a hydrogel or gelatinous precipitate rather than a well-crystallized mineral. This suggestion is reinforced by the fact that x-ray diffractions are weak and ill defined. The mineral characteristically occurs in impure amorphous-to-cryptocrystalline crusts and masses with conchoidal fracture.
Industry:Science
A simple cylindrical boring common in the fossil record for the past 540 million years. <i>Trypanites</i> is an ichnogenus, which is a formal name given to a distinct trace fossil (evidence of organism behavior in the fossil record as distinct from the remains or other representations of the organism's body). <i>Trypanites</i> is thus not a type of life but a structure built by a variety of wormlike animals over time.
Industry:Science
A simple lipid. Triglycerides are fatty acid triesters of the trihydroxy alcohol glycerol which are present in plant and animal tissues, particularly in the food storage depots, either as simple esters in which all the fatty acids are the same or as mixed esters in which the fatty acids are different. The triglycerides constitute the main component of natural fats and oils.
Industry:Science
