定价： 345元 / 折扣价： 294 元

定价： 689元 / 折扣价： 586 元 加购物车

定价： 481元 / 折扣价： 409 元

定价： 605元 / 折扣价： 515 元

5.1 The standard deviation, or one of its derivatives, such as relative standard deviation or pooled standard deviation, derived from this practice, provides an estimate of precision in a measured value. Such results are ordinarily expressed as the mean value ± the standard deviation, that is, X ± s.5.2 If the measured values are, in the statistical sense, “normally” distributed about their mean, then the meaning of the standard deviation is that there is a 67 % chance, that is 2 in 3, that a given value will lie within the range of ± one standard deviation of the mean value. Similarly, there is a 95 % chance, that is 19 in 20, that a given value will lie within the range of ± two standard deviations of the mean. The two standard deviation range is sometimes used as a test for outlying measurements.5.3 The calculation of precision in the slope and intercept of a line, derived from experimental data, commonly is required in the determination of kinetic parameters, vapor pressure or enthalpy of vaporization. This practice describes how to obtain these and other statistically derived values associated with measurements by thermal analysis.1.1 This practice details the statistical data treatment used in some thermal analysis methods.1.2 The method describes the commonly encountered statistical tools of the mean, standard derivation, relative standard deviation, pooled standard deviation, pooled relative standard deviation, the best fit to a (linear regression of a) straight line (or plane), and propagation of uncertainties for all calculations encountered in thermal analysis methods (see Practice E2586).1.3 Some thermal analysis methods derive the analytical value from the slope or intercept of a linear regression straight line (or plane) assigned to three or more sets of data pairs. Such methods may require an estimation of the precision in the determined slope or intercept. The determination of this precision is not a common statistical tool. This practice details the process for obtaining such information about precision.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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 / 折扣价： 502 元 加购物车

1. Scope This Standard covers the pressure preservative treatment of wood shakes and shingles of Western Red Cedar, Lodgepole Pine, and Southern Yellow Pine using chromated copper arsenate (CCA).

定价： 364元 / 折扣价： 310 元

4.1 This practice establishes the criteria to treat, or mark, or both WPM with permanent identification for the phytosanitary treatment, or intended service cycle, or both, repair, specification used, and other designated characteristics.4.2 The marking of the WPM shall be performed after ensuring the material complies with the applicable specification.1.1 This practice covers the development of recommended treatment, or marking practices, or both, for wood packaging materials (WPM) and aids in identifying WPM as to phytosanitary treatment, intended service cycles, repair, the specific specification used to manufacture or recycle, and other user designated characteristics.1.2 This practice identifies WPM treated, or marked, or both in accordance with industry, government, or international recognized standards.1.3 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： 590元 / 折扣价： 502 元 加购物车

定价： 0元 / 折扣价： 0 元

1.1 This practice is intended as an aid in establishing a suitable procedure for the heat treatment of aluminum alloys. 1.2 Times and temperatures appearing in the heat treatment tables are typical for various forms, sizes, and manufacturing methods and may not provide the optimum heat treatment for a specific item. 1.3 Some alloys in the 6XXX series may achieve the T4 temper by quenching from within the solution temperature range during or immediately following a hot working process, such as upon emerging from an extrusion die. Such alternatives to furnace heating and immersion quenching are indicated by footnote O, of the table for heat treatment of wrought aluminum alloys. However, this practice does not cover the requirements for a controlled press heat treatment. (A practice for press solution heat treatment of aluminum alloys is being developed.)

定价： 0元 / 折扣价： 0 元

4.1 This guide allows the decision maker to determine which remedial treatment processes are and are not applicable to remediate an area of soil, surface water, or ground water that contains contaminants of concern.4.2 This guide provides the data to make cost comparisons of the remedial treatment processes.4.3 Analysis of treatment process design data can often be performed at the site with field instruments and test kits.4.4 Tables 1 and 2 are a guide to selecting and obtaining physical and chemical treatment process design data. Data marked with an “X” is needed to evaluate alternatives and select a remedial treatment process. Once the remedial process is selected, the additional data that are needed to design the selected remedial treatment process are marked with an “O.” It may be advisable to also collect the data marked with an “O” during the initial sampling event to minimize sampling trips to the site.4.5 Tables 3 and 4 list laboratory and field methods for analyzing this data. More than one analytical method may be listed. The most suitable method must be chosen for each application.(A) This table was developed jointly by the U.S. Army Corps of Engineers, Hazardous, Toxic, and Radioactive Waste Center of Expertise and the U.S. Environmental Protection Agency Technical Support Project—Engineering Forum. Additional information and methods can be found in 40 CFR 136, EPA SW-846, and Standard Methods for Evaluation of Water and Wastewater, most current edition.(B) Estimated sensitivity and detection ranges are method/kit specific. Detection ranges are estimates. Verify these methods are suitable for the samples at this site. Consult the method or manufacturer's catalogs for details.(C) Spectrometers and meters are instruments that can be used to analyze for many parameters. Kits cost much less, but usually analyze for only one parameter. There are many manufacturers of field test equipment. Verify that the field methods are applicable to the medium at this site.(D) USEPA 600/4-84-017, The Determination of Inorganic Anions in Water by Ion Chromatography, March 1984.(E) Parameters that should be analyzed in the field.(F) USEPA 600/4-79/020, Methods for Chemical Analysis of Water and Wastes, March 1983.(G) American Public Health Association, Standard Methods for the Examination of Water and Wastewater. Use the most recently published methods.(H) Use of test kits—Guide D5463.(I) Use Nernst equation to check ORP field data.(J) USEPA SW-846, Test Methods for Evaluating Solid Wastes, Physical/Chemical Methods, 3rd Edition, Updates I, IIA, IIB, III, IIIA, IVA, and IVB.(K) A USGS method for ferrous iron analysis.(L) Analysis of Dissolved Methane, Ethane, and Ethylene in Ground Water by a Standard Gas Chromatohraphic Technique, developed by USEPA National Risk Management Laboratory, Ada, OK.(A) Standard Methods (SM) for the Examination of Water and Wastewater, 18th edition, 1992.(B) Except for soil oxygen and soil CO2, soil samples can be analyzed in an offsite laboratory.(C) Test Methods for Evaluating Solid Waste, Physical/Chemical Methods (SW-846).(D) Field test kits are often available that test for multiple parameters. There are several manufacturers of field soil test kits.(E) Sample digestion required prior to analysis—see water parameters table.(F) These metals can also be analyzed by atomic adsorption.(G) Screening level.(H) Estimate with Walkley-Black TOC and subtract other substances included in the TOC analysis.(I) USEPA/600/4-79/020, Methods for Chemical Analysis of Water and Wastes, March 1983.4.6 This guide does not address sampling for contaminants of concern and sampling locations. See EM 200-1-2 Technical Project Planning (TPP) under Engineering Manuals6 for information on sampling contaminants of concern. It is recommended that the treatment process design sampling be coordinated with the sampling for chemicals of concern to minimize duplicate sampling and trips to the site.4.7 This guide does not address physical and chemical properties related to contaminant transport. This is addressed in Guide D5730.4.8 This guide does not address why the data is needed to evaluate each treatment technology. This information is addressed in the Federal Remediation Technologies Roundtable (FRTR) site at http://www.frtr.gov in the U.S. Army Corps of Engineers guidance documents at http://www.usace.army.mil/inet/usace-docs/ and the United Facilities Guide Specifications (UFGS) available at http://www.ccb.org/.4.9 This guide does not address Quality Assurance / Quality Control (QA/QC) or sampling design strategy. See U.S. Army Corps of Engineers Engineering Regulation ER 1110-1-263 and Engineering Manual EM 200-1-36 for information on QA/QC. This needs to be addressed in the Quality Assurance Project Plan (QAPP).1.1 This guide lists the physical and chemical treatment processes design data needed to evaluate, select, and design treatment processes for remediation of contaminated sites. This data is listed in Tables 1 and 2. Much of these data can be obtained and analyzed at the site with instruments and test kits.1.2 It is recommended that this guide be used in conducting environmental site assessments and Remedial Investigations/Feasibility Studies (RI/FS) and selections of remedy in U.S. Code of Federal Regulations 40 CFR 300.430.1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 / 折扣价： 502 元 加购物车

1 Scope This clause of part 1 is applicable except as follows: 1.1 Addition: This standard applies to electrical motor-operated floor polishing (including waxing and buffing), scrubbing and grinding, scarifying and carpet shampooing appliances

定价： 637元 / 折扣价： 542 元

1. Scope and Object This clause of part 1 is applicable except as follows: 1.1 Scope Replacement: This standard applies to AUTOCLAVES and STERILIZERS, including those with an automatic loading and unloading system, which incorporate a CHAMBER

定价： 910元 / 折扣价： 774 元

1. Scope and Object This clause of part 1 is applicable except as follows: 1.1 Scope Replacement: This standard applies to STERILIZERS, including those having an automatic loading and unloading system, with one or more C HAMBERS operating at

定价： 910元 / 折扣价： 774 元

3.1 The sound transmission loss provided by a material that covers a flat surface depends not only on the physical properties of the material but also on the type of structure to which it is mounted and the mounting method used.3.2 Naval and marine architects and design engineers require specific transmission loss characteristics of acoustical treatment materials as they would exhibit installed on a ship's structure. The mounting structure and procedures specified in these practices are intended to simulate such a shipboard environment.3.3 Test reports may refer to this mounting by Practices E1123 instead of providing a detailed description of the mounting used.1.1 These practices describe test specimen mountings to be used for naval and marine ship applications during sound transmission loss tests performed in accordance with Test Method E90.1.2 The structure specified in these practices is intended for mounting of single-layer treatments or composite treatments consisting of various materials and configurations. Acoustical treatment materials may be combinations of acoustical absorbent materials, limp mass septums, and insulation materials.1.3 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 / 折扣价： 502 元 加购物车

3.1 The procedure described in this practice is designed to provide a method by which the coating weight of chromium treatments on metal substrates may be determined.3.2 This procedure is applicable for determination of the total coating weight and the chromium coating weight of a chromium-containing treatment.1.1 This practice covers the use of X-ray fluorescence (XRF) techniques for determination of the coating weight of chromium treatments on metal substrates. These techniques are applicable for determination of the coating weight as chromium or total coating weight of a chromium-containing treatment, or both, on a variety of metal substrates.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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 / 折扣价： 438 元 加购物车