定价： 774元 / 折扣价： 658 元

定价： 3822元 / 折扣价： 3249 元

定价： 1177元 / 折扣价： 1001 元

定价： 862元

定价： 724元

定价： 1342元

定价： 1211元

定价： 369元

定价： 571元 加购物车

定价： 882元

1.1 This practice covers the general planning of a spectrochemical laboratory, the equipment necessary for efficient operation of such a laboratory, and recommended safety precautions to be considered. Principal equipment housed in such a laboratory may include optical emission spectrographs, vacuum and air-path optical emission spectrometers, plasma emission spectrometers, X-ray emission spectrometers, X-ray diffractometers, and atomic absorption and flame emission spectrophotometers. 1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

定价： 0元

定价： 683元 / 折扣价： 581 元

3.1 Every commercial parasail operator shall have a hard mount or handheld visual weather monitoring device. VHF alone is not acceptable.3.2 Each vessel Master shall maintain a weather log in accordance with the procedures in Section 4.3.3 Wind Conditions:3.3.1 Commercial parasailing is prohibited when the current observed wind conditions in the area of operation include a sustained wind speed of more than 20 mph, wind gusts of a difference of 15 mph greater than the sustained wind speed, the wind speed during gusts exceed 25 mph or rain or heavy fog results in reduced visibility of less than 0.5 mile, or when a known lightning storm comes within 7 miles of the parasailing area.3.3.2 Hawaiian Islands region: due to the consistent nature of the offshore trade winds, operators in this region may operate under a 5 mph allowance to the sustained wind speed for offshore wind conditions only. Onshore wind conditions remain the same in accordance with 3.3.1. Therefore, commercial parasailing may occur in sustained offshore wind speeds up to 25 mph.3.4 Sea Conditions—It is understood that sea conditions can cause additional loading of the parasail tow line.3.4.1 Operators in lakes, intercoastal areas, and rivers shall not operate in sea conditions or a wave height that exceed 3 ft. Attention should be given to the specific body of water in these cases as these locations are typically protected areas. Therefore a wave height or water surface condition that meets or exceeds 3-ft waves or chop may be produced by wind that exceeds the 20 mph threshold described in 3.3.3.4.2 Operators in offshore areas shall not operate in sea conditions that exceed a wave height of 4 ft, unless wave height and period are in accordance with the following calculation: 3 s of period for every 1 ft of wave height (for example, 4 ft = 12 s, 5 ft = 15 s, etc.). Wind speed and payload shall also be taken into consideration at all times of operation. The best evidence of wind and wave conditions within the flying area shall be determined by the vessel Master and may differ from a weather service report.3.5 In no case shall parasail operations be conducted in weather conditions that exceed the manufacturer's specified limitations of the equipment being used.1.1 This guide covers monitoring weather conditions for safer parasail operation.1.2 This guide details parasail operators having weather-monitoring devices and keeping a weather log on board their vessels.1.3 Units—The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

定价： 0元

This practice covers the procedures for filling low-pressure pressurized products in laboratory research and experimental work and in commercial refrigeration and pressure filling. Propellants and chemicals should be properly stored and handled. Care should be taken when handling sealing machinery such as crimpers and seamers and aerosol containers. Safety equipment should be installed and all basic and additional safety precautions should be properly disseminated and observed.1.1 This practice covers the filling of low-pressure pressurized products, either in the laboratory or in production.1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements, see Section 2.

定价： 0元

4.1 Solid-state electronic devices subjected to stresses from excessive current pulses sometimes fail because a portion of the metallization fuses or vaporizes (suffers burnout). Burnout susceptibility can vary significantly from component to component on a given wafer, regardless of design. This practice provides a procedure for establishing the limits of pulse current overstress within which the metallization of a given device should survive.4.2 This practice can be used as a destructive test in a lot-sampling program to determine the boundaries of the safe operating region having desired survival probabilities and statistical confidence levels when appropriate sample quantities and statistical analyses are used.Note 2—The practice may be extended to infer the survivability of untested metallization adjacent to the specimen metallization on a semiconductor die or wafer if care is taken that appropriate similarities exist in the design and fabrication variables.1.1 This practice covers procedures for determining operating regions that are safe from metallization burnout induced by current pulses of less than 1-s duration.Note 1—In this practice, “metallization” refers to metallic layers on semiconductor components such as interconnect patterns on integrated circuits. The principles of the practice may, however, be extended to nearly any current-carrying path. The term “burnout” refers to either fusing or vaporization.1.2 This practice is based on the application of unipolar rectangular current test pulses. An extrapolation technique is specified for mapping safe operating regions in the pulse-amplitude versus pulse-duration plane. A procedure is provided in Appendix X2 to relate safe operating regions established from rectangular pulse data to safe operating regions for arbitrary pulse shapes.1.3 This practice is not intended to apply to metallization damage mechanisms other than fusing or vaporization induced by current pulses and, in particular, is not intended to apply to long-term mechanisms, such as metal migration.1.4 This practice is not intended to determine the nature of any defect causing failure.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

定价： 0元