释义 |
shielding
shield S0341300 (shēld)n.1. A broad piece of armor made of rigid material and strapped to the arm or carried in the hand for protection against hurled or thrusted weapons.2. A person or thing that provides protection.3. A protective device or structure, as:a. A steel sheet attached to an artillery piece to protect gunners from small-arms fire and shrapnel.b. Physics A wall or housing of concrete or lead built around a nuclear reactor to prevent the escape of radiation.c. Electronics A structure or arrangement of metal plates or mesh designed to protect a piece of electronic equipment from electrostatic or magnetic interference.d. A pad worn, as at the armpits, to protect a garment from perspiration.e. A sanitary napkin.4. Zoology A protective plate or similar hard outer covering; a scute or scutellum.5. Something that resembles a shield, as:a. An escutcheon.b. A decorative emblem that often serves to identify an organization or a government.c. A police officer's badge.6. Geology The ancient, stable, interior layer of continents composed of primarily Precambrian igneous or metamorphic rocks. Also called continental shield.v. shield·ed, shield·ing, shields v.tr.1. To protect from being attacked, exposed to danger, or subjected to difficulty: "a policymaking elite whose families and purses are shielded from the sacrifices war entails" (Uwe E. Reinhardt). See Synonyms at defend.2. To cover up; conceal: "Though many eyes were watching, none could pierce the halo of morning sunlight that surrounded and shielded the hawk" (Peter Dunne).v.intr. To act or serve as a shield or safeguard. [Middle English sheld, from Old English scield; see skel- in Indo-European roots.] shield′er n.shielding1. Material of suitable thickness and physical characteristics used to protect personnel from radiation during the manufacture, handling, and transportation of fissionable and radioactive materials. 2. Obstructions which tend to protect personnel or materials from the effects of a nuclear explosion.ThesaurusNoun | 1. | shielding - the act of shielding from harm protection - the activity of protecting someone or something; "the witnesses demanded police protection" | | 2. | shielding - a shield of lead or concrete intended as a barrier to radiation emitted in nuclear decayshield - a protective covering or structure | | 3. | shielding - shield consisting of an arrangement of metal mesh or plates designed to protect electronic equipment from ambient electromagnetic interferenceshield - a protective covering or structure | Translationsbouclierécran de protectionschermaturaIdiomsSeeshieldShielding
shielding[′shēld·iŋ] (electromagnetism) electric shielding (metallurgy) Placing a nonconducting object in an electrolytic bath during plating to alter the current distribution. (nucleonics) Reducing the ionizing radiation reaching one region of space from another region by using a shield or other device. shield Shielding (also screening), in electrical engineering and radio engineering, a means of reducing—that is, of suppressing or substantially attenuating—the effect of external stray fields, noise, or pickup. Such phenomena interfere with the operation of, for example, electrical or radio equipment, data transmission equipment, and data-processing equipment. Shielding is accomplished by means of a grounded metal or metal-plated shield with a high electrical or magnetic conductivity. Either the stray-field or noise source or the equipment or component to be shielded is enclosed in the shield. Depending on the extent of shielding required, either solid shields or screens are used. Solid shields are usually made of sheet steel; screens are woven from copper or steel wire. In many cases, the metal housing of a device acts as a shield. Complicated or bulky equipment is often installed in a room or chamber that is shielded. shielding Related to shielding: Radiation shieldingWords related to shieldingnoun the act of shielding from harmRelated Wordsnoun a shield of lead or concrete intended as a barrier to radiation emitted in nuclear decayRelated Wordsnoun shield consisting of an arrangement of metal mesh or plates designed to protect electronic equipment from ambient electromagnetic interferenceRelated Words |