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Certification of the Rheological Behavior of SRM 2490, Polyisobutylene Dissolved in 2,6,10,14-Tetramethylpentadecane
ISBN: 9781494741396 / Angielski / Miękka / 102 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. The certification of the rheological properties of standard reference material SRM 2490, a non-Newtonian fluid consisting of polyisobutylene dissolved in 2,6,10,14-tetramethylpentadecane, is described. The viscosity and the first normal stress difference were measured in steady shear at rates between 0.001 s-1 and 100 s- 1 at 0 C, 25 C and 50 C. The linear viscoelastic storage modulus G' and loss modulus G'' were also measured in dynamic oscillatory measurements between 0.04 rad/s and 100 rad/s in the temperature range between 0 C and 50 C and master curves calculated using time temperature...
The certification of the rheological properties of standard reference material SRM 2490, a non-Newtonian fluid consisting of polyisobutylene dissolved...
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60,49 zł |
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CFAST - Consolidated Model of Fire Growth and Smoke Transport (Version 6): Technical Reference Guide
ISBN: 9781495215780 / Angielski / Miękka / 132 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. CFAST is a two-zone fire model capable of predicting the environment in a multi-compartment structure subjected to a fire. It calculates the time evolving distribution of smoke and fire gases and the temperature throughout a building during a user- prescribed fire. This report describes the equations which constitute the model, the physical basis for these equations, and an evaluation of the sensitivity and predictive capability of the model.
CFAST is a two-zone fire model capable of predicting the environment in a multi-compartment structure subjected to a fire. It calculates the time evol...
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60,49 zł |
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Tactical Aircraft: Comparison of F-22A and Legacy Fighter Modernization Programs
ISBN: 9781490547534 / Angielski / Miękka / 46 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. The Air Force expects to invest a total of $9.7 billion in F-22A modernization through 2023. The Air Force and Navy have modernized many of their fighter and attack aircraft over the past several decades. Given this historical experience and concerns about the mounting cost of F-22A modernization. GOA was asked to examine the history of the modernization programs of the F-15, F-16, and F/A-18, and compare those legacy programs with the F-22A modernization program.
The Air Force expects to invest a total of $9.7 billion in F-22A modernization through 2023. The Air Force and Navy have modernized many of their figh...
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cena:
60,49 zł |
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Diesel Adsorption to PVC and Iron During Contaminated Water Flow and Flushing Tests
ISBN: 9781495919466 / Angielski / Miękka / 54 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. The purpose of this study is to use a NIST fluorescence based measurement technique to add to the existing data on aqueous diesel adsorption to solid surfaces and to support the development of flushing and contamination models. In a previous study the diesel excess surface density was measured on an oxidized copper surface. The present study expands the database to diesel attachment to a polyvinyl chloride (PVC) surface and to an iron surface.
The purpose of this study is to use a NIST fluorescence based measurement technique to add to the existing data on aqueous diesel adsorption to solid ...
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47,58 zł |
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A Report on the Certification of an Absolute Molecular Mass Distribution Polymer Standard: Standard Reference Material 2881
ISBN: 9781495920042 / Angielski / Miękka / 60 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. The certification of the absolute molecular mass distribution (MMD) of an n-octyl-initiated, proton-terminated, low mass, atactic polystyrene (PS) by matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) is fully described. This polymer has been designated Standard Reference Material (SRM) 2881. The material constituting SRM 2881 was prepared commercially for the NIST Polymers Division specifically for use as a narrow-distribution polymer standard. Anticipated uses include calibration of mass spectrometers and size exclusion chromatographs (SEC) in...
The certification of the absolute molecular mass distribution (MMD) of an n-octyl-initiated, proton-terminated, low mass, atactic polystyrene (PS) by ...
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cena:
55,64 zł |
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Certification of a Polystyrene Synthetic Polymer, SRM 2888
ISBN: 9781495920110 / Angielski / Miękka / 52 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. This report describes certification of the Mw of SRM 2888, a polystyrene (PS), by light scattering. As supplemental numbers, the Mn by NMR end group analysis and the Mw, Mn and the MMD by MALDI-TOF-MS are also given. SRM 2888 was prepared commercially for NIST Polymers Division for use as a standard for Size Exclusion Chromatography and as a narrow distribution polymer standard with well-defined classical molecular mass moments for comparative studies by MALDI-MS. This material was specially prepared and characterized for well-defined end groups. After packaging of this material for future...
This report describes certification of the Mw of SRM 2888, a polystyrene (PS), by light scattering. As supplemental numbers, the Mn by NMR end group a...
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64,52 zł |
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Certification of the Rheological Behavior of SRM 2490, Polyisobutylene Dissolved in 2,6,10,14-Tetramethylpentadecane
ISBN: 9781495920424 / Angielski / Miękka / 96 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. This report describes the certification of the rheological properties of Standard Reference Material(r) (SRM) 2490, a non-Newtonian fluid consisting of polyisobutylene dissolved in 2,6,10,14-tetramethylpentadecane.
This report describes the certification of the rheological properties of Standard Reference Material(r) (SRM) 2490, a non-Newtonian fluid consisting o...
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cena:
59,68 zł |
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Specular Gloss
ISBN: 9781495920479 / Angielski / Miękka / 76 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. This document describes the instrumentation, standards, and measurement techniques used at the National Institute of Standards and Technology (NIST) to measure specular gloss. The organization of this document is as follow. Section 1 describes the motivation for establishing a reference goniophotometer and primary standards for specular gloss and associated calibration services that are available. Section 2 presents the theory and measurement equations relevant to the measurements described in this document. The NIST reference goniophotometer including the illuminator, goniometer, receiver,...
This document describes the instrumentation, standards, and measurement techniques used at the National Institute of Standards and Technology (NIST) t...
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39,34 zł |
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Spectroradiometric Detector Measurements: Part I-Ultraviolet Detectors and Part II-Visible to Near-Infrared Detectors
ISBN: 9781495920608 / Angielski / Miękka / 120 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. The National Institute of Standards and Technology supplies calibrated photodiode standards and special tests of photodetectors for absolute spectral responsivity from 200 nm to 1800 nm. (This service will soon be expanded to 20 m in the infrared.) The scale of absolute spectral responsivity is based solely on detector measurements traceable to the High Accuracy Cryogenic Radiometer maintained by the National Institute of Standards and Technology. Silicon photodiode light-trapping detectors are used to transfer the optical power unit from this cryogenic radiometer to monochromator-based...
The National Institute of Standards and Technology supplies calibrated photodiode standards and special tests of photodetectors for absolute spectral ...
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cena:
59,68 zł |
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Absorbed Dose to Water Calibration of Ionization Chambers in a 60 Co Gamma-Ray Beam
ISBN: 9781495920769 / Angielski / Miękka / 52 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. This document is intended to give a detailed report on the service offered by NIST for the calibration of ionization chambers in terms of the quantity absorbed dose to water.
This document is intended to give a detailed report on the service offered by NIST for the calibration of ionization chambers in terms of the quantity...
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47,58 zł |
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Regular Spectral Transmittance
ISBN: 9781495921094 / Angielski / Miękka / 60 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. This document describes measurement services, instrumentation, and techniques for regular spectral transmittance over the spectral range from 250 nm to 2500 nm at the National Institute of Standards and Technology. Section 2 explains the basic theory in deriving the transmittance, while a more thorough derivation is reserved for the interested reader in Appendix A. Section 3 describes the reference instrument hardware, software, validation, procedures, and uncertainties. Section 4 provides this same detailed information for the transfer instrument. Sample calibration reports and sample data...
This document describes measurement services, instrumentation, and techniques for regular spectral transmittance over the spectral range from 250 nm t...
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cena:
64,52 zł |
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Documentation and Assessment of the Transport Property Model for Mixtures Implemented in NIST REFPROP (Version 8.0)
ISBN: 9781495921209 / Angielski / Miękka / 52 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. In this report, the authors describe an extended corresponding states model for viscosity and thermal conductivity of mixtures implemented in Version 8 of the NIST computer program REFPROP. The model is a modification of a one-fluid, extended corresponding states (ECS) model for thermal conductivity and viscosity originally developed by Ely and Hanley The authors apply the model to selected mixtures representative of the fluids available in the NIST 23 database REFPROP (v8), such as refrigerants and natural gas constituent fluids, and present comparisons with experimental data. Comparisons...
In this report, the authors describe an extended corresponding states model for viscosity and thermal conductivity of mixtures implemented in Version ...
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47,58 zł |
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Compilation of NIST Higher-Order Methods for the Determination of Electrolytes in Clinical Materials
ISBN: 9781495921384 / Angielski / Miękka / 108 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. Higher order or "definitive" methods have been in use at NIST for several decades to establish certified values for electrolytes and other trace elements in clinical Standard Reference Materials (SRMs). Although some of these methods have been described in various NIST 260 series documents, there has not been, until now, a single information resource providing comprehensive descriptions of the methods in a format which facilitates systematic updates for new methods, performance improvements to existing methods and removal of methods which are considered obsolete. This manual attempts to...
Higher order or "definitive" methods have been in use at NIST for several decades to establish certified values for electrolytes and other trace eleme...
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cena:
76,63 zł |
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Gas Flowmeter Calibrations with the Working Gas Flow Standard
ISBN: 9781495921469 / Angielski / Miękka / 32 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. In this document, the authors provide an overview of the gas flow calibration service and the procedures for customers to submit their flowmeters to the National Institute of Standards and Technology (NIST) for calibration. They also document the flow calculation algorithms and uncertainties of the WGFS.
In this document, the authors provide an overview of the gas flow calibration service and the procedures for customers to submit their flowmeters to t...
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cena:
64,52 zł |
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Tin Freezing-Point Standard - SRM 741a
ISBN: 9781495924996 / Angielski / Miękka / 38 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. The freezing point or time is a defining fixed point of the International Temperature Scale of 1990 (ITS-90). Realization of this freezing point is performed using a fixed-point cell containing high-purity tin. In this document, the methods used for the fabrication of the tin freezing-point cells and for the evaluation of SRM 741a are described.
The freezing point or time is a defining fixed point of the International Temperature Scale of 1990 (ITS-90). Realization of this freezing point is pe...
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cena:
68,55 zł |
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Proceedings of the Dynamic Measurement and Control for Autonomous Manufacturing Workshops
ISBN: 9781495925122 / Angielski / Miękka / 184 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. This document details the proceedings of the Dynamic Measurement and Control for Autonomous Manufacturing Workshops held October 10 - 11, 2007 at Loyola College of Maryland.
This document details the proceedings of the Dynamic Measurement and Control for Autonomous Manufacturing Workshops held October 10 - 11, 2007 at Loyo...
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cena:
80,66 zł |
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Extending the Notion of Quality from Physical Metrology to Information and Sustainability
ISBN: 9781495925399 / Angielski / Miękka / 36 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. In this paper the authors intend to demonstrate the need for extending the notion of quality from the physical domain to information and, more comprehensively, to sustainability. In physical metrology there are well established principles such as fundamental units, precision, accuracy, traceability and uncertainty. In order to understand and define quality for information and sustainability the authors need to develop metrological concepts similar to those of physical metrology. Research efforts related to information quality (IQ) are scattered. IQ is primarily defined in terms of several...
In this paper the authors intend to demonstrate the need for extending the notion of quality from the physical domain to information and, more compreh...
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cena:
68,55 zł |
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Biometric Quality: The Last 1%: Biometric Quality Assessment for Error Suppression
ISBN: 9781495984501 / Angielski / Miękka / 68 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. Performance of biometric recognition systems degrades substantially as quality of the input samples drops. Although only a small fraction of input data are of poor-quality, the bulk of recognition errors can be attributed to poor-quality samples. If quality can be improved, either by sensor design, by user interface design, or by standards compliance, better performance can be realized. For those aspects of quality that cannot be designed-in, an ability to analyze the quality of a live sample is needed. This is useful primarily in initiating the reacquisition from a user, but also for the...
Performance of biometric recognition systems degrades substantially as quality of the input samples drops. Although only a small fraction of input dat...
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cena:
68,55 zł |
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Assessing Face Acquisition
ISBN: 9781495987854 / Angielski / Miękka / 40 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. US-VISIT requested that the biometrics usability team at the National Institute of Standards and Technology (NIST) examine the current US-VISIT face image collection process to identify any usability and human factors that may improve the existing face image capture process. As such this study did not address other technologies or technology solutions. This report presents the results of a study that examined five usability and human factors enhancements to the current US-VISIT collection process: 1. the camera should resemble a traditional camera; 2. the camera should click when the picture...
US-VISIT requested that the biometrics usability team at the National Institute of Standards and Technology (NIST) examine the current US-VISIT face i...
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cena:
64,52 zł |
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Report of Findings: Use of Language in Ballot Instructions
ISBN: 9781496016317 / Angielski / Miękka / 200 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. In this study, we compared two ballots that differed only in wording and presentation of the language on the ballots. For Ballot A, we used conventional wording and presentation, taken from typical ballots. For Ballot B, we used plain language wording and presentation. In a study of 45 voters in three geographic locations, we compared a ballot with traditional language instructions to a ballot with plain language instructions, we took both performance and preference data Findings and conclusions are included.
In this study, we compared two ballots that differed only in wording and presentation of the language on the ballots. For Ballot A, we used convention...
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cena:
76,63 zł |
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