| HVAC | heating, ventilating, and air conditioning |
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| CCDN | Central Council for District Nursing |
| DCP | dicalcium phosphate; Diploma in Clinical Pathology; Diploma in Clinical Psychology; District Communi... |
| DHA | dehydroacetic acid; dehydroascorbic acid; dehydroepiandrosterone; dihydroacetic acid; dihydroxyaceto... |
| DHD | district health department |
| SDH | Step-down heating |
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| DGH | District General Hospital |
| DHAs | District Health Authorities |
| D.C. | District of Columbia |
| district heating or cooling | A system that involves the central production of hot water, steam, or chilled water and the distribution of these transfer media to heat or cool buildings. (05 Dec 1998) |
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| public utility district | (PUD) A publicly owned energy producer or distributor. PUDs operate as special government districts under the authority of elected commissions. They are not regulated by public utility commissions. (05 Dec 1998) |
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| hospitals, district | Government-controlled hospitals which represent the major health facility for a designated geographic area. (12 Dec 1998) |
| district | 1. The territory within which the lord has the power of coercing and punishing. 2. A division of territory; a defined portion of a state, town, or city, etc, made for administrative, electoral, or other purposes; as, a congressional district, judicial district, land district, school district, etc. "To exercise exclusive legislation . . . Over such district not exceeding ten miles square." (The Constitution of the United States) 3. Any portion of territory of undefined extent; a region; a country; a tract. "These districts which between the tropics lie." (Blackstone) Congressional district. See Congressional. District attorney, the prosecuting officer of a district or district court. District court, a subordinate municipal, state, or United States tribunal, having jurisdiction in certain cases within a judicial district. District judge, one who presides over a district court. District school, a public school for the children within a school district. Synonym: Division, circuit, quarter, province, tract, region, country. Origin: LL. Districtus district, fr. L. Districtus, p. P. Of distringere: cf. F. District. See Distrain. Source: Websters Dictionary (01 Mar 1998) |
| district of columbia | A federal area located between maryland and virginia on the potomac river; it is coextensive with washington, d.c., which is the capital of the united states. (12 Dec 1998) |
| radio frequency heating | <radiobiology> Process for heating the plasma by transferring energy to ions or electrons using waves generated by an external oscillator at an appropriate frequency. (This is similar to how a microwave oven heats food.) There are various types: See: ECRH, ICRH, and Lower Hybrid. (09 Oct 1997) |
| gross heating value | (GHV) The maximum potential energy in the fuel as received. It reflects the displacement of fibre by water present in the fuel. Expressed as: GHV = HHV (1 - MC / 100) (05 Dec 1998) |
| heating | That heats or imparts heat; promoting warmth or heat; exciting action; stimulating; as, heating medicines or applications. Heating surface, the aggregate surface exposed to fire or to the heated products of combustion, especially. Of all the plates or sheets that are exposed to water on their opposite surfaces. Synonym: fire surface. Source: Websters Dictionary (01 Mar 1998) |
| heating curve | <chemistry> A plot of temperature verses time for a substance where energy is added at a constant rate. (09 Jan 1998) |
| heating value | The maximum amount of energy that is available from burning a substance. (05 Dec 1998) |
| higher heating value | (HHV) The maximum potential energy in dry fuel. For wood, the range is 7,600 to 9,600 Btu/lb. (05 Dec 1998) |
| net heating value | The potential energy available in the fuel as received, taking into account the energy loss in evapourating and superheating the water in the sample. Expressed as NVH = (HHV x (1- MC / 100)) - (LH(2)O x MC / 100) (05 Dec 1998) |
| electron cyclotron heating | <physics, radiobiology> Radiofrequency heating scheme that works by injecting electromagnetic wave energy at the electron cyclotron gyration frequency. The electric field of the electromagnetic wave at this frequency looks to a gyrating electron like a static electric field, and thus causes large acceleration of the electron (larger than if the frequency were off the cyclotron frequency and thus, to the electron, appearing to change direction as a function of time). The accelerated electron gains energy, which is then shared with other particles through collisions, resulting in heating. Higher harmonics (multiples) of the cyclotron frequency can also be used in principle. (09 Oct 1997) |
| turbulent heating | <radiobiology> Technique of using turbulence induced by large electric fields to rapidly heat a plasma, the turbulence increases the resistivity of the plasma. (09 Oct 1997) |
| lower heating value | (LHV) The potential energy in a fuel if the water vapour from combustion of hydrogen is not condensed. (05 Dec 1998) |
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