U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Projects/Programs

Topic Area
Displaying 276 - 300 of 1644

Comparison: Co-60 Absorbed Dose for High-Dose Dosimetry

Completed
The NIST comparison demonstrated the need to know the participant's calibration scheme and dose rates, as well as the inclusion of an additional dose level (1 kGy, in addition to 5 kGy, 15 kGy, and 30 kGy). The rationale for modifying the protocol was based on the recent NIST characterization of a

Comparison of Internet Congestion-Control Algorithms

Completed
Complex systems are generically characterized by a large number of factors and a large number of potential responses, hence statistical questions immediately present themselves as to 1. What should be measured? 2. What experiment design should be used to generate content-full data? 3. How should

A Comparison of WD-EPMA Heterogeneity Testing Procedures

Ongoing
X-ray stage mapping (XSM) can be used to determine the extent of heterogeneity on the micron scale though it is more time consuming and not as accurate as the more rigorous NIST random-point (RP) testing procedure. The objective of this work is to demonstrate the advantage of the latter procedure

Comparisons (Archive): International Comparison of Pu-241 Activity

Completed
Quantitation of 241Pu in low-level waste and environmental samples is of interest because 241Pu is a precursor of other transuranium nuclides that have longer half-lives, greater environmental mobility, and greater toxicity. In addition, 241Pu is the most difficult of the plutonium isotopes to
99Tc graph

Comparisons (Archive): International Comparison of Tc-99 Activity

Completed
Measurements by NIST on the solution were performed by three methods: viz., liquid scintillation (LS) standardizations (with 3H-standard efficiency tracing); with triple-to-double-coincidence ratio (TDCR) method; and with by 4ηβ(LS)-γ(NaI) live-timed anticoincidence (LTAC) measurements. Impurities
ionization chambers

Comparisons: NIST Participation in International Intercomparisons

Ongoing
The NIST Radioactivity Group pilots and participates in a variety of different comparison activities. The BIPM’s Consultative Committee on Ionizing Radiation (CCRI) organizes formal comparisons (“key comparisons”) of long-lived radionuclides through its Key Comparison Working Group (KCWG-II). As
illustration

Comparisons: Radiological Traceability Program (RTP)

Ongoing
The RTP provides an annual exchange of PT materials between NIST and RESL. It is designed to provide a mechanism for evaluating the ability of RESL scientists to prepare PT materials containing known activities of various radionuclides (Table 1), and to analyze materials of unknown activities in 6
IPython Automation

Complete Automation and Distribution of Parallel Simulation Tasks

Ongoing
In computational materials science, many problems require the execution of numerous parallel simulation tasks on High Performance Computing (HPC) resources. Often a single published data point is the result of several parallel tasks executed in a specific sequence. Despite the continual improvement

Composition in IoT/CPS

Completed
One approach develops a ‘CPS algebra’ based on a formal language that offers the expressive power needed to capture the observable behavior of Cyber-Physical System (CPS) components, and at the same time offers a way to express the notion of composition of CPSs. A second effort extends the in
Illustration of cyberbrain surrounded by industry icons

Computation Platform for AI/ML

Ongoing
In collaboration with NIST’s Information Technology Laboratory and Office of Information Systems Management, the Office of Data and Informatics is supporting the deployment and development of the long-term operational model for the enki computation platform for NIST staff members who research and

Computational Biology: Comparison of Cell Image Segmentation Algorithms

Ongoing
The Problem: The initial project problem was to determine whether image analysis techniques existed (or could be developed by the ITL groups) which would assist in the automatic differentiation of the A10 and 3T3 cell lines. The larger problem at hand was to determine what factors (and interactions)

Computational Biology Project

Ongoing
Overview: High-throughput technologies are generating large amounts of complex data that is difficult to process and convert into knowledge Issues exist throughout data lifecycle: Acquisition Analysis Archiving Interchange Imaging technologies are increasingly being used both as diagnostic tools and

Computational Chemistry

Ongoing
Given the combinatorial possibilities for combining fundamental elements to create novel molecules, bench science experimentation is impractical as a wholesale means to discovery. By contrast, computational resources abound and thereby offer a possible alternative. However, this immense resource is
CDPM Logo

Computational Design of Photopolymerized Materials

Ongoing
Photopolymerization represents a versatile method that affords rapid and robust manufacturing of polymers and composites. The properties of polymerized materials can be controlled by the chemistry and processing parameters, as well as novel molecular mechanisms. As such, photopolymerization has

Computational Micromagnetics

Ongoing
Micromagnetics technologies constitute the foundation of computer storage devices. Exponential growth in the size of portable magnetic memories accompanied by decrease cost-per-byte is evidence of success in this technology. To sustain this growth engineers and scientists are increasingly using
simulated 3d SEM images of a 60nm gold nanoparticle

Computational Scanning Electron Microscopy

Ongoing
In many cases, SEM measurements are carried out without knowledge of the best measurement conditions, partly due to engineering limits of the SEM, but also due to lack of thorough knowledge of the physics of the signal generation. For example, in many cases the best-quality results can be obtained

Computer Forensic Reference Data Sets

Ongoing
There are several uses envisioned for the data sets, but we also expect that there will be unforeseen applications. The four most obvious applications are testing forensic tools, establishing that lab equipment is functioning properly, testing proficiency in specific skills and training laboratory

Computer Forensics Tool Testing (CFTT)

Ongoing
The Computer Forensics Tool Testing Program is a project in The Software Diagnostics and Conformance Testing Division supported by The Office of Law Enforcement Standards.
Was this page helpful?