定价： 1325元 / 折扣价： 1127 元 加购物车

定价： 2317元 / 折扣价： 1970 元 加购物车

定价： 1990元 / 折扣价： 1692 元 加购物车

定价： 164元 / 折扣价： 140 元 加购物车

定价： 219元 / 折扣价： 187 元

定价： 301元 / 折扣价： 256 元 加购物车

定价： 2855元 / 折扣价： 2427 元 加购物车

定价： 73元 / 折扣价： 63 元

The data obtained by this test method are useful for establishing stress versus failure-time relationships in a controlled environment. The long-term strength (LTS) is determined primarily for materials used in molding applications. The LTS categorized in accordance with Table 1 of ASTM D2837 is known as the SDB (strength design basis).Note 1—These SDB values will be published in PPI TR-4 for materials used in molding applications only.The test method can also be used on an experimental basis for pipe-grade materials as an indicator of stress-rupture performance. The long-term strength or SDB values obtained by this test method are not intended to replace the HDB determined for pressure pipe tested in accordance with Test Method D1598.In order to determine how plastics will perform in pipe fitting applications, it is necessary to establish the stress-failure time relationships over four or more decades of time (hours) in a controlled environment. Because of the nature of the test and specimens employed, no single line can adequately represent the data, and therefore the confidence limits should be established.Note 2—Some materials may exhibit a nonlinear relationship between log-stress and log-failure time, usually at short failure-times. In such cases, the 105 - hour stress value computed on the basis of short-term test data may be significantly different than the value obtained when a distribution of data points in accordance with Test Method D2837 is evaluated. However, these data may still be useful for quality control or other applications, provided correlation with long-term data has been established.1.1 This test method covers the requirements to determine the time-to-failure of thermoplastic resins for piping applications by uniaxial loading of a grooved tensile test specimen. This grooved tensile specimen achieves a multi-axial stress condition, which mimics the stress condition found in pressurized solid-wall plastic pipe. The ratio of the stress in the axial direction to the transverse direction approximates that for a pressurized solid-wall pipe specimen.1.2 It is intended that the data generated on these specimens be analyzed according to the methodology set forth in Test Method D2837 to generate a long-term strength design value for the material.1.3 The values stated in SI units are to be regarded as the standard. The values given 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 and health practices and determine the applicability of regulatory limitations prior to use.

定价： 0元 / 折扣价： 0 元

定价： 355元 / 折扣价： 302 元 加购物车

定价： 1092元 / 折扣价： 929 元 加购物车

定价： 2434元 / 折扣价： 2069 元 加购物车

The purpose of this guide is to assure comparability between paper-based and computer-based amendments. Paper-based and computer-based amendments must have comparable methods, practices and policies, in order to assure an unambiguous representation of the sequence and timing of documented events. Original and amended health information entries and documents must both be displayed and must be consistent across both domains. Comparability does not rule out, however, the use of capabilities specific to the electronic world, which do not have paper-based counterparts, for example, displaying the amended text with a pop-up window, which can show the text prior to its amendment.Traditional paper-based health records and policies support the need of authorized authors of health information to amend entries and documents in the health record under appropriate circumstances. In a paper-based health record, amending entries is accomplished by drawing a line through the erroneous entry, writing in the correct information, and authenticating the amendment by signing and dating the change. Such corrections always display the original documentation along with the amendment. This procedure is used to assure an unambiguous representation of the sequence and timing of documented events and any appropriate amendments.Current and emerging technologies for health records, including, but not limited to, computer-based health records, employ different input and display methodologies than the traditional paper-based record and, therefore, different amendment alternatives for health record or health information entries, or both. Health information may be entered directly into an automated, electronic, or computer-based health record system, for example, by voice, keyboard (either by the care practitioner, transcriptionist, or other intermediary), mouse, pen, tablet, a personal digital assistant, or through the use of structured data entry. Unlike a written record, which essentially is always viewed in its original handwritten or typewritten form, the presentation and display of electronic and computer-based health information often is transformed. This transformation occurs when information is transferred from one computerized system to another system or filtered by different display characteristics or views of the data. In addition, in contrast to the paper-based record, computers and computer systems can modify display of the data directly, for example, in nonchronological order or filtering through queries. Amended electronic records should display a distinct and obvious notation of their amended state. Access to the original health information should be immediately available, that is, prior amendments back to and including the original record.1.1 This guide addresses the criteria for amending individually-identifiable health information. Certain criteria for amending health information is found in federal and state laws, rules and regulations, and in ethical statements of professional conduct. Although there are several sources for guidance, there is no current national standard on this topic.

定价： 0元 / 折扣价： 0 元

定价： 1405元 / 折扣价： 1195 元 加购物车

定价： 91元 / 折扣价： 78 元 加购物车