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Streetart Postcards - Best of Collection with 30 Cards (Paperback): Joab Nist Streetart Postcards - Best of Collection with 30 Cards (Paperback)
Joab Nist
R467 R397 Discovery Miles 3 970 Save R70 (15%) Ships in 10 - 15 working days

With more than a million fans the facebook page is a big success story and has shown the best street art from cities all over the world for more than 5 years. For the first time the best motifs have been collected in a high-quality postcard box giving a great insight into the lively international street art scene! To give, send and keep! 30 postcards in a high quality hardcover box.

College Rules!, 4th Edition (Paperback, 4th Revised edition): Sherrie Nist-Olejnik College Rules!, 4th Edition (Paperback, 4th Revised edition)
Sherrie Nist-Olejnik
R416 R258 Discovery Miles 2 580 Save R158 (38%) Ships in 10 - 15 working days
An Assessment of the National Institute of Standards and Technology Engineering Laboratory - Fiscal Year 2014 (Paperback):... An Assessment of the National Institute of Standards and Technology Engineering Laboratory - Fiscal Year 2014 (Paperback)
National Research Council, Division on Engineering and Physical Sciences, Laboratory Assessments Board, Committee On NIST Technical Programs, Panel On Review Of The Engineering Laboratory At The National Institute Of Standards And Technology
R890 Discovery Miles 8 900 Ships in 10 - 15 working days

The mission of the Engineering Laboratory of the National Institute of Standards and Technology (NIST) is to promote U.S. innovation and industrial competitiveness through measurement science and standards for technology-intensive manufacturing, construction, and cyberphysical systems in ways that enhance economic prosperity and improve the quality of life. To support this mission, the Engineering Laboratory has developed thrusts in smart manufacturing, construction, and cyberphysical systems; in sustainable and energy-efficient manufacturing materials and infrastructure; and in disaster-resilient buildings, infrastructure, and communities. The technical work of the Engineering Laboratory is performed in five divisions: Intelligent Systems; Materials and Structural Systems; Energy and Environment; Systems Integration; and Fire Research; and two offices: Applied Economics Office and Smart Grid Program Office. An Assessment of the National Institute of Standards and Technology Engineering Laboratory Fiscal Year 2014 assesses the scientific and technical work performed by the NIST Engineering Laboratory. This report evaluates the organization's technical programs, portfolio of scientific expertise within the organization, adequacy of the organization's facilities, equipment, and human resources, and the effectiveness by which the organization disseminates its program outputs.

An Assessment of Four Divisions of the Physical Measurement Laboratory at the National Institute of Standards and Technology -... An Assessment of Four Divisions of the Physical Measurement Laboratory at the National Institute of Standards and Technology - Fiscal Year 2018 (Paperback)
National Academies of Sciences, Engineering, and Medicine, Division on Engineering and Physical Sciences, Laboratory Assessments Board, Committee On NIST Technical Programs, Panel on Review of Four Divisions of the Physical Measurement Laboratory at the National Institute of Standards and Technology
R941 R888 Discovery Miles 8 880 Save R53 (6%) Ships in 10 - 15 working days

An Assessment of Four Divisions of the Physical Measurement Laboratory at the National Institute of Standards and Technology: Fiscal Year 2018 assesses the scientific and technical work performed by four divisions of the National Institute of Standards and Technology (NIST) Physical Measurement Laboratory. This publication reviews technical reports and technical program descriptions prepared by NIST staff and summarizes the findings of the authoring panel.

An Assessment of the National Institute of Standards and Technology Physical Measurement Laboratory - Fiscal Year 2015... An Assessment of the National Institute of Standards and Technology Physical Measurement Laboratory - Fiscal Year 2015 (Paperback)
National Academies of Sciences, Engineering, and Medicine, Division on Engineering and Physical Sciences, Laboratory Assessments Board, Committee On NIST Technical Programs, Panel on Review of the Physical Measurement Laboratory at the National Institute of Standards and Technology
R796 Discovery Miles 7 960 Ships in 10 - 15 working days

The Physical Measurement Laboratory (PML) at the National Institute of Standards and Technology (NIST) is dedicated to three fundamental and complementary tasks: (1) increase the accuracy of our knowledge of the physical parameters that are the foundation of our technology-driven society; (2) disseminate technologies by which these physical parameters can be accessed in a standardized way by the stakeholders; and (3) conduct research at both fundamental and applied levels to provide knowledge that may eventually lead to advances in measurement approaches and standards. This report assesses the scientific and technical work performed by the PML and identifies salient examples of accomplishments, challenges, and opportunities for improvement for each of its nine divisions.

The Practical Catechist (Hardcover): Jakob B 1859 Nist The Practical Catechist (Hardcover)
Jakob B 1859 Nist; Ferreol 1839-1930 Girardey
R938 Discovery Miles 9 380 Ships in 7 - 11 working days
The Practical Catechist (Hardcover): Jakob 1859- Nist, Ferreol 1839-1930 Girardey The Practical Catechist (Hardcover)
Jakob 1859- Nist, Ferreol 1839-1930 Girardey
R937 Discovery Miles 9 370 Ships in 7 - 11 working days
The Practical Catechist (Paperback): Ferreol Girardey Cssr, Brother Hermenegild Tosf The Practical Catechist (Paperback)
Ferreol Girardey Cssr, Brother Hermenegild Tosf; James Nist
R576 Discovery Miles 5 760 Ships in 7 - 11 working days

he Germans during the last two centuries turned their attention in a special manner to the vast field of instruction and education; but in no branch was there more earnest work done than in Catechetics. In numerous cathechetical periodicals and associations, and in a series of catechetical courses men of the greatest talent have devoted all their learning and ability to discuss and test the various methods, and to establish the most fruitful process of teaching Catechism. The movement has not yet met with perfect success; although the views of the weightiest authors now approach unanimity and a number of principles have been adopted as practically reliable, nevertheless it is not an easy matter to reduce them to practice. Of the many who have attempted to do so, only a few have met with satisfactory results. Lacking a thorough understanding of said principles, nearly all have applied them without sufficient care; among these are some who have the reputation of being masters in Catechetics. The Rev. James Nist, parish priest of Birkenhrerdt (Palatinate), easily surpasses all his predecessors, and may be considered by far the best in Catechetics, for he has satisfactorily fulfilled his task. He has, indeed, mastered the true catechetical Method, without allowing it to master him. His catechetical works, therefore, deserve to be recommended as models. Even the older and more experienced Catechists can find much to learn therein, and especially the rare art of becoming little with the little, of accommodating oneself to their mind, heart and will. Wherefore, most willingly complying with the request of the Publisher, I have written this brief Introductory to the English translation of his model work. I recommend especially a thorough study of his treatment of the Sixth Commandment, of the Holy Sacrifice of the Mass, and of the Sacrament of Penance (for the first confession).

Development and Verification of a Linear-Fit Mixed System Rating Method for Unitary Two-Speed and Variable-Speed Air... Development and Verification of a Linear-Fit Mixed System Rating Method for Unitary Two-Speed and Variable-Speed Air Conditioners (Paperback)
Nist
R329 Discovery Miles 3 290 Ships in 7 - 11 working days

A linear-fit method of rating residential-type air conditioning systems was evaluated based on performance predictions and laboratory testing of one two-speed matched system and two mixed systems (matched two-speed condensing unit, matched indoor coil blower, and two mixed coil blowers). The individual evaporators and the condensing unit were separately tested using water heated/cooled condensing/evaporating units at standard air conditions over a range of evaporator refrigerant saturation temperatures, evaporator superheats, and liquid refrigerant temperatures. Capacity predictions were within 1.0 % of the tested values for the mixed systems, and the EER predictions were within 1.5 % of the measured EERs. The methods used for system rating on the two-speed system can also be applied to a variable-speed system.

Building Plumbing System Decontamination - First Report on Recommendations (Paperback): Nist Building Plumbing System Decontamination - First Report on Recommendations (Paperback)
Nist
R364 Discovery Miles 3 640 Ships in 7 - 11 working days

This report summarizes the measurement results and recommended procedures for responding to building plumbing system contamination incidents and restoring the water system to safe operation. The recommendations are based on analysis of the results of a measurement and modelling research project investigated contamination and decontamination issues related to building plumbing systems.

Smoke Plume Trajectory from In Situ Burning of Crude Oil in Alaska - Updated Simulation Results (Paperback): Nist Smoke Plume Trajectory from In Situ Burning of Crude Oil in Alaska - Updated Simulation Results (Paperback)
Nist
R322 Discovery Miles 3 220 Ships in 7 - 11 working days

The purpose of this report is to update calculations, originally performed in 1993, that predict the downwind extent of smoke particulate from hypothetical in situ burns of spilled crude oil in Alaska. The reason for the update is that the National Ambient Air Quality Standards (NAAQS) have changed since 1993. These standards formed the basis for establishing, safe distances for separating potential burning sites from populated areas in Alaska."

Benefits and Costs of Research - A Case Study of the NIST High Performance Concrete Program (Paperback): Nist Benefits and Costs of Research - A Case Study of the NIST High Performance Concrete Program (Paperback)
Nist
R352 Discovery Miles 3 520 Ships in 7 - 11 working days

This report provides an economic review of the National Institute of Standards and Technology High Performance Concrete (HYPERCON) Program from the period FY01 through FY09. The HYPERCON research program is designed to lower the cost of concrete performance prediction by developing and applying new measurement science including materials science understanding and performance prediction. The infrastructural nature of measurement science, its hard-to-visualize character, and the diffuse nature of its economic impacts makes them difficult to assess. The economic study of HYPERCON applies an innovative approach that uses surveys and case studies of the primary stakeholders within the industry to supplement more traditional quantitative success measures. Stakeholder survey responses are analyzed within the framework of grounded theory in order to build a cohesive understanding and assessment of the research program over time. The HYPERCON industry consortium known as the Virtual Cement and Concrete Testing Laboratory (VCCTL) is compared to three other major consortia in the cement/concrete industry to highlight its strengths and opportunities for improvement and identify consortia best practices. The economic study reports and summarizes its findings in order to help direct future HYPERCON Program investments in a way that meets the most important concrete performance prediction needs of U.S. industry in the most cost effective manner.

Database-Assisted Design for Wind - Concepts, Software, and Example for High-Rise Reinforced Concrete Structures (Paperback):... Database-Assisted Design for Wind - Concepts, Software, and Example for High-Rise Reinforced Concrete Structures (Paperback)
Nist
R326 Discovery Miles 3 260 Ships in 7 - 11 working days

Time-domain analyses of wind effects on high-rise structures have been made possible in recent years by advances in wind pressure measurement and computer technology. Time domain solutions not only provide full phase information on structural responses to wind but can also account naturally for modes of vibration of any shape, including any number of higher modes of vibration, as well as for mode coupling. This study applies the Database-Assisted Design (DAD) methodology to the design of reinforced concrete high-rise structures. Given (a) the time histories of pressures, measured in the wind tunnel at a sufficient number of taps on the exterior faces of the building envelope for a sufficient number of mean speed directions, and (b) a preliminary design of the building, it is possible to calculate response databases for the demand-to-capacity indexes, inter-story drift, and top floor accelerations, that is, databases of responses induced by wind with any specified speed and direction. These responses are functions of the building s aerodynamic, geometric, structural, and dynamical features and are independent of the wind climate. The response databases are used in conjunction with a wind climatological database typically obtained by Monte Carlo simulation from measured extreme wind climatological data. The design is performed iteratively until the peak responses satisfy the design specifications. The present study is the first to apply Database-Assisted Design techniques to reinforced concrete high-rise buildings, and is in our opinion superior to conventional approaches currently in use from the point of view of physical modeling, accuracy, transparency, and convenience to the designer.

Benefits and Costs of Research - A Case Study of Improved Service Life Prediction (Paperback): Nist Benefits and Costs of Research - A Case Study of Improved Service Life Prediction (Paperback)
Nist
R373 Discovery Miles 3 730 Ships in 7 - 11 working days

This report provides an economic review of the National Institute of Standards and Technology High Performance Concrete (HYPERCON) Program from the period FY01 through FY09. The HYPERCON research program is designed to lower the cost of concrete performance prediction by developing and applying new measurement science including materials science understanding and performance prediction. The infrastructural nature of measurement science, its hard-to-visualize character, and the diffuse nature of its economic impacts makes them difficult to assess. The economic study of HYPERCON applies an innovative approach that uses surveys and case studies of the primary stakeholders within the industry to supplement more traditional quantitative success measures. Stakeholder survey responses are analyzed within the framework of grounded theory in order to build a cohesive understanding and assessment of the research program over time. The HYPERCON industry consortium known as the Virtual Cement and Concrete Testing Laboratory (VCCTL) is compared to three other major consortia in the cement/concrete industry to highlight its strengths and opportunities for improvement and identify consortia best practices. The economic study reports and summarizes its findings in order to help direct future HYPERCON Program investments in a way that meets the most important concrete performance prediction needs of U.S. industry in the most cost effective manner.

Effect of Al2O3 Nanolubricant on R134a Pool Boiling Heat Transfer with Extensive Measurement and Analysis Details (Paperback):... Effect of Al2O3 Nanolubricant on R134a Pool Boiling Heat Transfer with Extensive Measurement and Analysis Details (Paperback)
Nist
R276 Discovery Miles 2 760 Ships in 7 - 11 working days

This paper quantifies the influence of Al2O3 nanoparticles on the pool boiling performance of R134a/polyolester mixtures on a roughened, horizontal, flat surface. Nanofluids are liquids that contain dispersed nano-size particles. A lubricant based nanofluid (nanolubricant) was made by suspending 20 nm diameter Al2O3 particles in a synthetic ester to roughly a 1.6 % volume fraction. The nanoparticles enhanced the boiling heat transfer relative to that for R134a/polyolester mixtures without nanoparticles for the three lubricant mass fractions that were tested. The enhancement occurred for the lowest heat fluxes, which gives the opportunity for designing chillers for lower approach temperatures. For the 0.5 % nanolubricant mass fraction, the nanoparticles caused a heat transfer enhancement relative to the heat transfer of pure R134a/polyolester (99.5/0.5) as large as 400 % for the lowest tested heat flux. The average heat flux improvement for heat fluxes less than 40 kW/m2 was approximately 105 %, 49 %, and 155 % for the 0.5 %, the 1 %, and the 2 % mass fractions, respectively. The heat flux enhancement for all of the mixtures increased with respect to decreasing heat flux. Due to the good quality of the nanolubricant suspension, the performance of the (99.5/0.5), and the (98/2) nanolubricant mixtures was stable over time.

Factors Influencing the Smoldering Performance of Polyurethane Foam (Paperback): Nist Factors Influencing the Smoldering Performance of Polyurethane Foam (Paperback)
Nist
R327 Discovery Miles 3 270 Ships in 7 - 11 working days

The objective of this study was to evaluate whether polyurethane foam (PUF) could be produced as a standard reference material for ultimate use in a standard test intended to ensure the smoldering performance of commercially available upholstered furniture. For this purpose, PUF was produced by a commercial manufacturer and its smoldering propensity was evaluated. The experimental design was organized into four parts or Iterations. In Iteration 1, the results showed that smoldering intensity was dominated by foam morphology, which overrides effects of chemical composition for the range of polyols and surfactants studied here. In Iteration 2, the morphology of the foam was controlled by varying the processing parameters, i.e., tin catalyst content, water content and mixing head pressure. The results showed that smoldering increased with air permeability but a better morphological descriptor of the foam structure was required to fully characterize smoldering in the high permeability range (i.e., in PUF with a dominantly open-cell structure). In Iteration 3, it was determined that for these types of foams, smoldering was controlled by cell size. The feasibility of a reference material with well-characterized and reproducible smoldering is linked to the ability to manufacture an open-cell PUF with a well-defined cell size and density. In Iteration 4, scale-up from the pilot plant to the production line was considered. Foams with much more consistent properties (e.g., air permeability, density, cell size, etc.) throughout the bun of foam were fabricated in the production line as compared to the pilot plant. This allowed for the fabrication of PUFs with a very reproducible smoldering to be used as a potential standard reference material.

Tracking the National Fire Problem - The Data behind the Statistics (Paperback): Nist Tracking the National Fire Problem - The Data behind the Statistics (Paperback)
Nist
R322 Discovery Miles 3 220 Ships in 7 - 11 working days

The objective of this report is to support the development of descriptive statistics and associated measures of uncertainty for characterizing, tracking, and better understanding the root causes of the U.S. fire burden by identifying the relevant costs and losses associated with fire, i.e., information needed to make cost-effective decisions for reducing the economic impact fires have on society, and identifying sources of data that would allow future statistical analysis, while highlighting areas where future research is needed. This data will be used to develop performance metrics, enabling future comparisons between the use of new fire mitigation technologies and their impact on the U.S. fire burde

Performance of New and Aged Residential Fire Sprinklers (Paperback): Nist Performance of New and Aged Residential Fire Sprinklers (Paperback)
Nist
R328 Discovery Miles 3 280 Ships in 7 - 11 working days

The U.S. Consumer Product Safety Commission (CPSC) initiated a program to determine the effects of emissions from problem drywall on residential electrical, gas distribution, and fire safety components. As part of this program, the National Institute of Standards and Technology (NIST) generated data to help determine whether there has been degradation in the activation performance of automatic residential fire sprinklers exposed to those emissions, as manifested by changes to sprinkler activation time. NIST tested three sets of sprinklers in the sensitivity test oven (plunge test apparatus), according to the oven heat test section of UL 199 / UL 1626. Set 1 (bulb type) residential sprinklers were provided by CPSC staff and described as having been installed in homes with problem drywall; Set 2 sprinklers (bulb and fusible types) were purchased new by NIST and tested as received; and Set 3 comprised new sprinklers, of the same models as Set 2, after they had been subjected to an accelerated aging protocol, the Battelle Class IV corrosivity environment. Sprinklers from all three sets were installed and tested in the UL 199 / UL 1626 plunge test apparatus.

Energy Consumption of Automatic Ice Makers Installed in Domestic Refrigerators (NIST TN 1697) (Paperback): Nist Energy Consumption of Automatic Ice Makers Installed in Domestic Refrigerators (NIST TN 1697) (Paperback)
Nist
R325 Discovery Miles 3 250 Ships in 7 - 11 working days

This study examines the energy consumption of automatic ice makers installed in domestic refrigerators. The purpose of this research is to determine a method of measuring the energy consumption of automatic ice makers that will generate a repeatable and reproducible result. This study examined four refrigerator-freezers of different configurations, one top-mount unit, one side-by-side unit, and two French-door units with bottom freezers. The components and operational modes of each ice maker varied among the test subjects. This study examined each automatic ice maker and its components, and discussed how the operation of each component contributed to the overall energy consumption. Two of the units had a single-speed compressor that maintained the compartments within a range of temperatures by switching on and off. Since this type of unit draws considerable power when the compressor operates and very little when it doesn t, a good representation for energy consumption can only be characterized over a number of whole compressor cycles. However, the unit s ice maker also produces cyclic variation in power draw; therefore accurate measurement of the ice maker energy consumption must be characterized over a number whole of ice making cycles. Since the unit s compressor cycles and the ice making cycles are not coincident, it is difficult to determine the ice making energy using a predefined test period. The other two units employed inverter driven variable-speed compressors, which operated by maintaining a constant, part-load condition and did not cycle on and off. Determination of the ice making efficiency for these units was rather straightforward since data could be examined over a whole number of ice making cycles. We also examined the conditions which affect the ice making efficiency. The results showed that the ice making efficiency is influenced by the operating temperatures inside the cabinets.

Technical Guidance for the Specification and Development of Homeland Security Simulation Applications (Paperback): Nist Technical Guidance for the Specification and Development of Homeland Security Simulation Applications (Paperback)
Nist
R353 Discovery Miles 3 530 Ships in 7 - 11 working days

This document provides general guidance that is designed to help the U.S. Department of Homeland Security (DHS) Program Managers who may have limited expertise in simulation to better understand this technology. It is also intended to help the relevant professional community in developing better technical specifications for homeland security modeling and simulation (M&S) applications. Contractors outside of DHS typically develop homeland security M&S applications. Often the M&S applications that are developed today are difficult to extend for new purposes, integrate with other software systems, or used by persons other than the original developer/development team. Slight changes to a model or scenario may require major changes to a system and significant cost to the sponsor. Examples of topics (within the context of simulation) that are addressed in this report include: , Analysis of user needs and system requirements, Specification development: conceptual models, detailed designs, and interfaces, Modeling and simulation technologies appropriate to different problem domains, Use of proprietary commercial versus open source software, Project team and developer qualifications, Simulation engine, User interfaces, Inputs and output data types, Databases, data files, and translators, Documentation and training, Software risk management, Verification, validation, accreditation, and testing, Information security mechanisms, Distributed architectures and communications, Standards The technical guidance contained in this report is based on published literature, information available on the Internet, technical expertise, and personal experience.

Prototype Commercial Buildings for Energy and Sustainability Assessment - Design Specification, Life- Cycle Costing and Carbon... Prototype Commercial Buildings for Energy and Sustainability Assessment - Design Specification, Life- Cycle Costing and Carbon Assessment (Paperback)
Nist
R322 Discovery Miles 3 220 Ships in 7 - 11 working days

Energy efficiency requirements in current commercial building energy codes vary across states, and most states have not yet adopted the newest energy standards. Current state energy code adoptions range across all editions of the ASHRAE 90.1 Standard (-1999, -2001, -2004, and -2007). Some states do not have a code requirement for energy efficiency, leaving it up to the locality or jurisdiction to set its own requirement. The ability for states to quantify the relative costs and benefits of past or future code adoptions can inform policymakers with respect to the outcomes from their decisions. The Engineering Laboratory's Applied Economics Office has developed an extensive database, known as the Building Industry Reporting and Design for Sustainability (BIRDS) database, which allows the comparison of the energy efficiency and sustainability of alternative building designs based on different editions of ASHRAE Standard 90.1. The expansive database is a compilation of multiple data sources, including results from 13 680 whole building energy simulations for 12 commercial building prototypes in 228 cities across all U.S. states, building construction costs from RS Means and Whitestone databases, energy cost data collected from the Energy Information Administration, and emissions data collected from the Environmental Protection Agency. This report documents the prototype building designs and the life cycle costing and carbon assessment data and approaches implemented in the BIRDS building energy efficiency and sustainability database.

Performance of New and Aged Residential Fire Smoke Detectors (Paperback): Nist Performance of New and Aged Residential Fire Smoke Detectors (Paperback)
Nist
R352 Discovery Miles 3 520 Ships in 7 - 11 working days

As part of the Consumer Product Safety Commission (CPSC) technical staff program to determine the effects of emissions from imported drywall on residential electrical, gas distribution, and fire safety components, the National Institute of Standards and Technology (NIST) has generated data to aid assessment of whether there has been a loss of functionality of fire smoke detectors exposed to those emissions. NIST tested four sets of smoke detectors in the Fire Emulator/Detector Evaluator (FEDE) and the UL 217 test apparatus. Set 1 (ionization only) detectors were provided by CPSC staff and described as having been installed in homes with imported drywall; Set 2 (ionization only) detectors (same models as Set 1 but different batches) were described as coming from contemporaneous homes without the presence of imported drywall; Set 3 smoke detectors were purchased new by NIST and tested as received; and Set 4 comprised detectors from Set 3 that had been subjected to an accelerated aging protocol to simulate 10-year exposure to the effluent from imported drywall. Detectors from Set 1 and Set 2 activated within UL 217 sensitivity test parameters. Tests using the FEDE found differences in sensitivity between Sets 1 and 2 and between the ionization detectors in Sets 3 and 4 that were numerically small compared to the allowable performance range. An even smaller improvement in sensitivity was found for photoelectric smoke detectors between Sets 3 and 4. Two of the Set 1 smoke detectors sensed the presence of smoke, but would not send the signal to activate interconnected alarms. Two other Set 1 smoke detectors failed to operate under AC power, but operated properly under the required 9V battery back-up. It could not be determined whether the observations of Set 1 detector performance could be attributed to exposure to the emissions from imported drywall or to other factors.

Measurements and Models for the Wireless Channel in a Ground-Based Urban Setting in Two Public Safety Frequency Bands... Measurements and Models for the Wireless Channel in a Ground-Based Urban Setting in Two Public Safety Frequency Bands (Paperback)
Nist
R322 Discovery Miles 3 220 Ships in 7 - 11 working days

We report on measured peer-to-peer (ground-based) wireless channel characteristics for an urban environment in two public safety frequency bands. Results are based upon measurements taken in Denver in June 2009. The public safety bands we investigated are the 700 MHz and 4.9 GHz bands, both intended for public safety and emergency-response applications. Our study of the urban environment in these bands included an estimation of the distributions of both the number of multipath components and their delays. Our measurements employed a vector network analyzer, from which both path loss and delay dispersion characteristics were obtained for link distances up to approximately 100 m. Log-distance models for path loss are presented, and dispersive channel models are also described. Our dispersive channel models employ a statistical algorithm for the number of multipath components, previously used only in indoor settings. By employing a transmit-antenna positioner, we introduced spatial diversity into the measurement system, which enabled analysis of the dispersion characteristics of the angle of departure, also new for this ground-to-ground channel. The channel models should be useful for public safety communication system design and development.

Experimental Characterization of Helium Dispersion in a -Scale Two-Car Residential Garage (NIST TN 1694) (Paperback): Nist Experimental Characterization of Helium Dispersion in a -Scale Two-Car Residential Garage (NIST TN 1694) (Paperback)
Nist
R327 Discovery Miles 3 270 Ships in 7 - 11 working days

A series of experiments are described in which helium was released at constant rates into a 1.5 m 1.5 m 0.75 m enclosure designed as a -scale model of a two car garage. The purpose was to provide reference data sets for testing and validating computational fluid dynamics (CFD) models and to experimentally characterize the effects of a number of variables on the mixing behavior within an enclosure and the exchange of helium with the surroundings. Helium was used as a surrogate for hydrogen, and the total volume released was scaled as the amount that could be released by a typical hydrogen-fueled automobile with a full fuel tank. Temporal profiles of helium were measured at seven vertical locations within the enclosure during and following one hour and four hour releases. Idealized vents in one wall sized to provide air exchange rates typical of actual garages were used. The effects of vent size, number, and location were investigated using three different vent combinations. The dependence on leak location was considered by releasing helium from three different points within the enclosure. A number of tabulated quantitative measures are used to characterize the experiments. The complete experimental measurement results for each condition are available on the internet as described in Appendix A (http: //www.nist.gov/el/fire_protection/buildings/upload/HeliumDispersionDataSets.zip.

Characterization of the Range Performance of a 3D Imaging System (NIST TN 1695) (Paperback): Nist Characterization of the Range Performance of a 3D Imaging System (NIST TN 1695) (Paperback)
Nist
R325 Discovery Miles 3 250 Ships in 7 - 11 working days

A 3D imaging instrument is a non-contact measurement instrument used to rapidly obtain 3D information about a scene or object. The use of and the applications for these instruments have grown tremendously in the last decade. The expanded use of 3D imaging instruments has revealed a significant lack of commonly accepted methods and standards to both characterize and report the performance of these systems, and to develop confidence limits for the data and their end products. Industry, and in particular the construction sector, needs open, consensus-based standards regarding the performance and use of 3D imaging instruments for construction applications. To support this need, the National Institute of Standards and Technology (NIST) is developing the measurement science (e.g., performance data) required to facilitate the development of standards for 3D imaging instruments. As a part of this effort, NIST conducted experiments to characterize the range performance of 3D imaging instruments. The objective of the experiments was to evaluate the effects of various factors on the range error of a 3D imaging instrument. The factors evaluated were: range, angle-of-incidence (AOI), reflectivity, azimuth angle, method of obtaining range measurement (measure single point on target or scanning target), and target type (planar vs. spherical). The results of these experiments are presented in this report.

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