4.1 Materials and devices that function at least in part by adhering to living tissues are finding increasing use in surgical procedures either as adjuncts to sutures and staples, or as frank replacements for those devices in a wide variety of medical procedures. While the nature and magnitude of the forces involved varies greatly with indication and with patient specific circumstances, all uses involve to some extent the ability of the material to resist imposed mechanical forces. Therefore, the mechanical properties of the materials, and in particular the adhesive properties, are important parameters in evaluating their fitness for use. In addition, the mechanical properties of a given adhesive composition can provide a useful means of determining product consistency for quality control, or as a means for determining the effects of various surface treatments on the substrate prior to use of the device.4.2 The complexity and variety of individual applications for tissue adhesive devices, even within a single indicated use (surgical procedure) is such that the results of a single-lap-shear test are not suitable for determining allowable design stresses without thorough analysis and understanding of the application and adhesive behaviors.4.3 This test method may be used for comparing adhesives or bonding processes for susceptibility to fatigue and environmental changes, but such comparisons must be made with great caution since different adhesives may respond differently to varying conditions.1.1 This test method is intended to provide a means for comparison of the adhesive strengths of tissue adhesives intended for use as surgical adhesives or sealants, or both, on soft tissue. With the appropriate choice of substrate, it may also be used for purposes of quality control in the manufacture of tissue adhesive based medical devices.1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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.

定价： 590元 / 折扣价： 502 元 加购物车

The purpose of this practice is to provide guidance to owners, mechanics, airports, regulatory officials, and aircraft and component manufacturers who may accomplish maintenance, repairs, and alterations on a light unmanned aircraft system (UAS). In addition, this practice covers the format and content of maintenance manuals and instructions for the maintenance, repair, and alteration of light UAS. The light UAS can be operated as a commercial aircraft or as a sport aircraft. This practice states the requirements for the maintenance of light commercial UAS. These same requirements may be used for the sport light UAS with the provisions shown. The maintenance requirements are divided between the aircraft and the ground equipment. The aircraft contains the air data terminal and the ground station controls the nearby ground data terminal. Therefore, the data link is not listed as a separate component, but has elements in the aircraft and near the ground station that is called the ground data terminal.1.1 This practice provides guidelines for the qualifications to accomplish the various levels of maintenance on certificated light unmanned aircraft system (UAS). In addition, it provides the content and structure of maintenance manuals for aircraft, ground control station, and data links that are operated as a light unmanned aircraft system (UAS).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.

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This specification defines requirements for the data used in the tracking and traceability base-62 encoding system. It provides the format of the resultant code to characterize various components used in fuel gas piping systems. In this specification, the final output is a 16 digit alpha-numeric code that defines a standardized approach or methodology for encoding certain characteristics of components that have been established based on consensus recommendations from the respective stakeholder group members. The gas distribution component traceability identifier is also provided in this specification wherein the gas distribution component traceability identifier shall be comprised of sixteen alphanumeric characters that specify respective attributes for a given component. The gas distribution component traceability identifiers also include identifications of component manufacturer, identification of component manufacturer's lot code, the component production date, the component material, the component size, and the component type.1.1 This specification defines requirements for the data used in the tracking and traceability base-62 encoding system and the format of the resultant code to characterize various components used in fuel gas piping systems.1.2 The final output of this specification is a 16 digit alpha-numeric code that defines a standardized approach or methodology for encoding certain characteristics of components that have been established based on consensus recommendations from the respective stakeholder group members. The means of marking or affixing the code to the components, and the means of reading and/or transferring the data or codes are outside the scope of this specification.NOTE 1: To facilitate compliance with this specification, a web based application has been developed to manage and maintain unique manufacturer identification numbers. The URL for the website is: http://www.componentid.org.1.3 The web based application is only intended to serve as a useful resource for managing the respective manufacturer identification numbers, codes, and other identifiers as per this specification. Any changes to the contents of the web based application are contingent upon subsequent changes to this specification. This specification shall have primacy.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.

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Hermeticity test methods, for example, Test Methods F 134, deal with sealed packages only and do not apply directly to unsealed packages. This test method is most applicable for determining the hermeticity of a package before it has been sealed with a lid or a cover. Packages that are intended for hermetic seal use are manufactured so as to prevent leakage of helium at a rate in excess of 1 × 10 −8 atm cc/s under a pressure differential of 1 atm when tested on a helium mass spectrometer leak detector. This test should be conducted in a clean work area such as would be provided by a laminar flow clean bench as specified in Fed. Std. No. 209. This test method is not recommended for use in commerce until the precision has been determined.Acceptance and rejection criteria for this test method shall be agreed upon by the purchaser and the supplier as part of the purchase contract.Note 1—Packages that are not capable of meeting a maximum leak rate of 1 × 10 −8 atm cc/s of helium at a pressure differential of 1 atm are customarily rejected on the basis that good quality assurance is achieved with this performance level.1.1 The hermetic integrity of hybrid microcircuit packages is an important material or parts acceptance requirement. Determination of this parameter should be made before the hybrid circuit is assembled and sealed inside the package.1.2 This test method covers a test for leaks in a package that is intended to be hermetically sealed after hybrid circuit assembly. Various types of hybrid packages may be tested by this test method. The test method is nondestructive and therefore suitable for 100% inspection.1.3 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems 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.

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4.1 GeneralMeasurements and observations described in this document are used to assess the performance of an AM system with a given system set-up and process parameters, in combination with a specific feedstock material.The primary characterization of the AM system obtained by applying this document is via geometric accuracy, surface finish, and minimum feature sizes of the benchmarking test piece(s).4.2 Comparing results from one machineThe test piece(s) can be built and measured for example when the new machine is installed. The test piece(s) can be used to periodically evaluate the performance or diagnose a fault in one AM system, for example, after system maintenance or as specified by the requirements of a quality system.The test piece(s) described in this test method can be used as a demonstration of capabilities for a contract between a buyer and seller of AM parts or AM systems.Data from the measurements described in this document can be used to gauge the impact of new process parameters or material on the AM system performance.Certain test geometries can be included with every build on a particular AM system to help establish performance traceability. Depending on the needs of the user, not all test artefacts need to be built, and individual test artefacts can be built separately if required.1.1 This document covers the general description of benchmarking test piece geometries, i.e. artefacts, along with quantitative and qualitative measurements to be taken on the benchmarking test piece(s) to assess the performance of additive manufacturing (AM) systems.This performance assessment can serve the two following purposes:– AM system capability evaluation;– AM system calibration.The benchmarking test piece(s) is (are) primarily used to quantitatively assess the geometric performance of an AM system. This document describes a suite of test geometries, each designed to investigate one or more specific performance metrics and several example configurations of these geometries into test build(s). It prescribes quantities and qualities of the test geometries to be measured but does not dictate specific measurement methods. Various user applications can require various grades of performance. This document discusses examples of feature configurations, as well as measurement uncertainty requirements, to demonstrate low- and high-grade examination and performance. This document does not discuss a specific procedure or machine settings for manufacturing a test piece.1.2 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： 1011元 / 折扣价： 860 元 加购物车

定价： 590元 / 折扣价： 502 元 加购物车

定价： 515元 / 折扣价： 438 元 加购物车

定价： 515元 / 折扣价： 438 元 加购物车

定价： 590元 / 折扣价： 502 元 加购物车

定价： 515元 / 折扣价： 438 元 加购物车

定价： 0元 / 折扣价： 0 元 加购物车

定价： 590元 / 折扣价： 502 元 加购物车

定价： 590元 / 折扣价： 502 元 加购物车

定价： 590元 / 折扣价： 502 元 加购物车

定价： 590元 / 折扣价： 502 元 加购物车