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Pulse technique
| Глоссарий по неразрушающему контролю в авиации |
Multifrequency technique in which a broadband excitation such as an impulse is used. either the frequency components are extracted and analyzed or the interpretation is based directly on characteristics of the time domain waveform.
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Pulse, английский
- A discontinuous burst of laser, light or energy, as opposed to a continuous beam. a true pulse achieves higher peak powers than that attainable in a cw output.
- A current or voltage which changes abruptly from one value to another and back to the original value in a finite length of time. used to describe one particular variation in a series of wave motions. the parts of the pulse include the rise time, fall time, and pulse width, pulse amplitude. the period of a pulse refers to the amount of time between pulses.
- Pulso
- The regular expansion and contraction of an artery caused by the heart pumping blood through the body, which can be felt with the fingers especially where an artery is near the surface of the body, as in the wrist or neck her pulse is very irregular. to take or feel a person’s pulse to measure a person’s pulse rate by pressing on the skin above an artery with the fingers has the patient’s pulse been taken? comment: the standard adult pulse is about 72 beats per minute, but it is higher in children. the pulse is usually taken by placing the fingers on the patient’s wrist, at the point where the radial artery passes through the depression just below the thumb.
- A brief emission of radio energy by a radar system. the detection and ranging part of the acronym is accomplished by timing the delay between transmission of radio energy and its subsequent return.
- Импульс
- Heart rate. normal adult resting heart rate varies among horses but is usually 40 beats per minute.
- Transient electrical or ultrasonic signal that has a rapid increase in amplitude to its maximum value, followed by an immediate return.
- Transient electrical or ultrasonic signal that has a rapid increase in amplitude to its maximum value, followed by an immediate return.16
Pulse, английский
Pulse (echo) overlap method, английский
Pulse (echo) reflection method, английский
Pulse (ut), английский
A series of vibrations or oscillations having a brief duration.
Pulse acquisition radar, английский
Импульсная рлс обнаружения
Pulse advancing, английский
Прохождение импульса
Pulse air injection, английский
System that uses exhaust pressure pulsations to force air into an exhaust system to oxidize exhaust products. see also air check valve. 114
Pulse amplifier, английский
- Импульсный усилитель раа pan american airways авиатранспортная компания «пан аме- рикэн эруэйс»
- Импульсный усилитель
Pulse amplitude, английский
Pulse amplitude modulation, английский
Импульсно-амплитудная модуляция
Pulse analyzer, английский
Анализатор импульсов; импульсный анализатор
Pulse blocking, английский
Блокированные импульсы pulse-broadening circuit схема распространения импульсов
Pulse bus, английский
Импульсная шина
Pulse campaign, syn. pulse immunization, английский
Кампании иммунизации, проводимые с определенной цикличностью
Pulse center frequency, английский
Pulse circuit, английский
Импульсная схема
Pulse code, английский
Импульсный код pulse-code modulation импульсно-кодовая модуляция
Pulse code modulation, английский
- Импульсно-кодовая модуляция икм
- Pcm
- Кодово- импульсная модуляция
- A time division modulation technique in which analog signals are sampled and quantized at periodic intervals. the values observed are typically represented by a coded arrangement of 8 bits of which one may be for parity.
Pulse code modulation (pcm), английский
Pulse code modulation telemetry system, английский
Телеметрическая система с кодово-импульсной модуляцией
Multifrequency, английский
- Многорежимный (монитор); мультисканирующий
- Two or more frequencies applied sequentially or simultaneously to the test coil.
Excitation, английский
- Возбуждение
- Energizing the active medium to a state of population inversion.
- The state of being mentally or physically aroused
Components, английский
Комплектующие
Interpretation, немецкий
Characteristics, английский
- The distinguishing qualities of a navigation aid or buoy, including shape and color, whether fixed or flashing, and flashing sequence.
- A high-performance fiber with high chemical resistance that does not burn in air. it has no melting point and does not drip when exposed to flame. the fiber and fabrics from pbi retain their flexibility, dimensional stability, and significant strength without embrittlement even when exposed to flame or extreme heat. the fiber emits little smoke in extreme conditions. it processes well on conventional textile equipment, having processing characteristics similar to polyester. it can be used in 100% form or blended with other fibers. it has a high moisture regain and low modulus with comfort properties similar to cotton. the natural color of pbi is a gold-khaki shade, but it can be dyed to almost any medium to dark shade with conventional basic dyes.
- Acetate fabrics are in appearance fast-drying, wrinkle and shrinkage resistant, crisp or soft in hand depending upon the end use.
- Although modacrylics are similar to acrylics in properties and application, certain important differences exist. modacrylics have superior resistance to chemicals and combustion, but they are more heat sensitive (lower safe ironing temperature) and have a higher specific gravity (less cover).
- Although the properties of the nylons described above vary in some respects, they all exhibit excellent strength, flexibility, toughness, elasticity, abrasion resistance, washability, ease of drying, and resistance to attack by insects and microorganisms.
- Because acrylic fibers are thermoplastic, fabrics may be heat-set for wrinkle resistance and to provide permanency to pleats. acrylic fabrics have low moisture absorbency and dry relatively quickly. in general, acrylic fibers are resistant to the degrading effects of ultraviolet rays in sunlight and to a wide range of chemicals and fumes. they provide warmth in fabrics that are lightweight, soft, and resilient. acrylic fibers have relatively poor flame resistance compared with other fibers. some acrylic fabrics, particularly knit types, approximate the hand of fine wool. because of the composition and cross section of the fiber, fabrics made therefrom have a high bulk to weight ratio. this is further enhanced with the so-called “high bulk” spun yarns.
- Glass fiber is incombustible and will tolerate heat up to 1000°f without material damage. potential strength is not realized in woven fabrics or even in yarns, because the fiber is brittle and fracture points may develop, but nevertheless, very high tensile strength is obtained in woven fabrics, and is retained at elevated temperatures. the fiber originally was difficult to color but methods have been developed to accomplish this. moisture absorption is low. electrical and insulation resistance is high.
- Polychlal fibers have a soft, lamb’s wool-like hand and moderate moisture regain. the fibers are also characterized by high flame resistance and high abrasion resistance.
- Polyester fibers have high strength and are resistant to shrinking and stretching. fabrics are quick drying and tend to have wrinkle resistance and crease retention, wet and dry. polyester is used alone and in blends. it has been one of the first fibers to be developed in fabrics with durable-press features.
- Polyethylene fibers have a low specific gravity, extremely low moisture regain, the same tensile strength wet and dry, and are resistant to attack by mildew and insects. these qualities have made polyethylene fiber suitable for industrial applications, geotextiles, outdoor furniture, and similar applications. polyethylene fiber does not dye, and in most cases, it is colored by the addition of pigments and dyes to the material prior to spinning. it has a low melting point, a property that has restricted its use in apparel.
- Polypropylene fibers have a number of advantages over polyethylene fibers in the field of textile applications. the degree of crystallinity, 72 to 75%, results in a fiber that is strong and resilient, and does not fibrillate like high-density polyethylene. polypropylene has a high work of rupture, which indicates a tough fiber, and may be made with tenacities as high as 8.0 to 8.5 grams per denier. the melting point of polypropylene is 165°c, which is low by comparison with nylon or polyester, but is high enough to make it suitable for most textile applications. so light that it actually floats, polypropylene fiber provides greater coverage per pound than any other fiber. it is highly resistant to mechanical abuse and chemical attack.
- Rayon yarns are made in a wide range of types in regard to size, physical characteristics, strength, elongation, luster, handle, suppleness, etc. they may be white or solution dyed. strength is regulated by the process itself and the structure of the yarn. (also see polynosic fiber.) luster is reduced by including delustering materials, such as titanium dioxide pigments, in the fiber when it is extruded. the suppleness of the yarn is controlled by the number of filaments in the yarn, the denier or gauge of the individual filaments or fibers, and the fiber cross-section.
- Spandex is lighter in weight, more durable, and more supple than conventional elastic threads and has between two and three times their restraining power. spandex is extruded in a multiplicity of fine filaments which immediately form a monofilament. it can be repeatedly stretched over 500% without breaking and still recover instantly to its original length. it does not suffer deterioration from oxidation as is the case with fine sizes of rubber thread, and it is not damaged by body oils, perspiration, lotions, or detergents.
Characteristic, английский
- Property that helps to distinguish between items of a given population (3)
- A quality which allows something to be recognised as different cancer destroys the cell’s characteristics. adjective being a typical or distinguishing quality symptoms characteristic of anaemia the inflammation is characteristic of shingles.
- N характеристика (см. тж. portrayal) articulatory ~ артикуляторная характеристика perceptual ~ перцептивная характеристика, характеристика восприятия
- Характерная особенность, признак; характеристика, особенность ~s of the loading особенности [параметры] нагружение (конструкции)
- The characteristic dimension dc
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Pulse tuning, английский
- Control of pulse frequency to optimize system response. q q, or quality factor, of a coil: quality factor of a coil, as the ratio of inductive reactance to resistance.
- Control of pulse frequency to optimize system response.7 q
Pulse echo technique, английский
- Ultrasonic test technique in which discontinuities are revealed by echoes from the transmitted pulses.
- Ultrasonic test technique in which discontinuities are detected by return echoes from the transmitted pulses.7
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