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Projects/Programs

Topic Area
Displaying 76 - 100 of 1616

Applied: Quantum Sensors for Charged Particle Detection

Ongoing
Quantum cryogenic detectors have proven very promising for x-ray and gamma-ray spectroscopy. The suppression of thermal noise due to cryogenic (sub-1K) temperatures leads to excellent energy resolution while still allowing for large collection areas and high absorption efficiency. Specifically, the

Applied spectroradiometry and imaging metrology

Ongoing
Stray light correction Array instruments are subject to measurement errors arising from detector's blooming, smearing, nonlinearity, and instrument's stray light. These errors (except the stray-light error) can either be avoided or corrected in many cases. However, the stray light, due to

Applied: Wide-Angle Neutron Polarization Analysis

Ongoing
We have developed a polarizer-analyzer-spin flipper system based solely on 3He spin filters on the Multi-Axis Crystal Spectrometer (MACS) at the NIST Center for Neutron Research. The compact system is housed by a 36 cm diameter, vertical solenoid. Neutrons are polarized by transmission through a

Artificial Intelligence for Chemical Manufacturing

Ongoing
The chemical manufacturing design process relies heavily on the recommended values that engineers and researchers usually obtain from handbooks and databases. Those sources often lack easy ways to judge the reliability of information, either in the sense of where the data come from or what the

Assay Development for Cell-Free Expression Systems

Ongoing
Current practices for characterizing cell-free expression systems are limited and unsuitable to advance these technologies beyond the state-of-the-art. To meet this measurement need, the Cellular Engineering Group is developing quantitative assays to benchmark cell extracts, reagents, and cell-free

Assessing the Environmental, Health and Safety Impact of Nanoparticles

Ongoing
Impact Nanomaterials have already been incorporated into a large range of commercial products including pharmaceuticals, sunscreens, automobile additives, personal care products, detergents and plastics. Although nanotechnology is changing the way we live, the accidental release of nanomaterials

Assessing Pyrrhotite in Concrete

Ongoing
Objective - Develop a standard test method and a set of calibration reference materials to quantify pyrrhotite in concrete. What is the technical idea? Pyrrhotite (Fe 1-xS, where x = 0 – 0.2) is a common sulfide mineral exhibiting a brownish-bronze color with a metallic luster. Physical properties

Assessment of Uncertainty in CALPHAD Descriptions

Ongoing
Knowledge of phase equilibria and phase transformations is absolutely essential for the development of new materials and processing methods. The CALPHAD (CALculation of PHAse Diagrams) method is a proven, indispensable tool in this endeavor. It combines thermodynamic descriptions of binary and

Asynchronous Cooperative Linear Dispersion Coding

Completed
The space–time block coding (STBC) techniques provide full spatial diversity in the context of collocated multiple-input–multiple-output (MIMO) systems, requiring reliable wireless communications at high rates. However, it may not always be practical to accommodate multiple antennas at the mobile

Atom Manipulation with the Scanning Tunneling Microscope

Ongoing
Manipulation of single atoms with the scanning tunneling microscope is made possible through the controlled and tunable interaction between the atoms at the end of the STM probe tip and the single atom (adatom) on a surface that is being manipulated. In the STM tunneling junction used for atom

Atom-based Silicon Quantum Electronics

Ongoing
This project is developing atomically precise, atom-based electronic devices for use in quantum information processing and analog quantum simulation. We are developing the fabrication, measurement, and modeling methods needed to realize single atom, spin-based qubits in silicon as an integrated

Atomic Spectroscopy Data Center

Ongoing
The Atomic Spectroscopic Data Center at NIST provides the most comprehensive collection of atomic spectroscopy data in the world. We monitor scientific literature and maintain bibliographic databases of all papers containing spectroscopic data. By evaluating and compiling data on energy levels

Atomic Standard for Pressure

Ongoing
Atomic physicists have calculated the pressure p( n, T) of helium gas as a function of the gas's temperature T and its refractive index at microwave frequencies, n. Near room temperature and 4 MPa, the fractional uncertainties from the calculations, the impurities in helium, state-of-art

Atomic Wavefunctions

Ongoing
The numerical solution of the multi-particle Schrodinger equation describing atomic systems remains a challenging for computational physics. ITL scientists are in the forefront of this field with respect to extremely high-accuracy computation of non-relativistic eigenstates of few electron systems.

Atomic-force microscopy

Ongoing
Atomic-force microscopy enables subnanometer imaging resolution, to extract geometric parameters of reference structures that advance measurement science, and to quantify the accuracy of device design and fabrication for stakeholders. We are advancing two primary atomic-force microscopy systems

Atomistic Potentials and the Future of Nanomaterials Metrology

Ongoing
Atomistic simulations are increasingly being used as a tool to understand and predict properties of materials in systems, such as nanomaterials, where direct measurement is time-consuming or extremely difficult. The success of atomistic simulations depends critically on the fidelity of a specific

Atomistic tools for structure-property investigations

Ongoing
Interatomic Potential Repository The Interatomic Potentials Repository (IPR) provides a source for interatomic potentials (force fields), related files, and evaluation tools to help researchers obtain interatomic models and judge their quality and applicability. The files provided are of known