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Projects/Programs

Keyword

Organizational Unit

Fluctuations and Nanoscale Control Software (Archived)

Completed

For each file YYY.m, type "doc YYY" from the Matlab command prompt for documentation, literature references, and usage guidelines. DSigma2_Est.m Estimates the diffusion coefficient (D) and localization noise (σ 2 or "Sigma2") from single-particle tracking data. It implements the algorithms for the

Focused-ion-beam machining

Ongoing

Structure determines function in diverse nanotechnologies, so that making devices to control or measure nanoscale phenomena begins with control of nanoscale structure. Few fabrication systems outperform the focused ion beam to pattern nanostructures by directing ions of various elements to an

FOREST

Ongoing

The goals of the research are to: Provide a testbed (Forested Optical Reference for Evaluating Sensor Technology, FOREST) for ecophysiological and optical sensors with well-established reference points Quantify ecosystem phenomenology that will allow for better estimates of productivity Link leaf

Frequency Comb Calibration of Astronomical Spectrographs

Ongoing

A powerful technique for finding exo-planets is based on measuring the tiny Doppler shifts in the light from a star that is induced by the presence of orbiting planets. While many exo-planets have been discovered using this Doppler radial velocity (RV) technique, it remains a significant technical

Frequency Comb Spectroscopy

Ongoing

Erbium mode-locked fiber lasers are a mature technology that provide a means to build robust optical frequency combs centered near 1550 nm. One research focus of our group is to extend the optical bandwidth of Er fiber-based combs into the near- to mid-infrared wavelength region of 1000 to 5000 nm

Frequency Conversion Interfaces for Photonic Quantum Systems

Ongoing

Our research on quantum frequency conversion follows two main tracks. First, we combine relatively mature frequency conversion technology based on periodically-poled lithium niobate waveguides with quantum light generated by single semiconductor quantum dots in proof-of-principle experiments that

Frequency Measurement and Analysis Service (FMAS)

Ongoing

Subscribers to the NIST service receive a complete frequency measurement system which includes everything needed to make precision frequency measurements that are traceable to NIST. An easy-to-read instruction manual makes installation a snap. Once the system is installed, it's easy to get started

Fundamental Constants in Nature

Ongoing

The Task Group on Fundamental Constants periodically publishes updated evaluations of the fundamental constants of physics and chemistry. These evaluations serve two purposes. First, they provide a self-consistent set of recommended values of the constants for all to use. Second, because they

Fundamental Physics: Electric Field Imaging with Neutrons

Completed

An effective magnetic field B eff arises from the relativistic transformation of an electric field E into the frame of reference moving at the neutron velocity v; B eff is proportional to v x E /c 2, hence is small due to the factor of the square of the speed of light in the denominator. This

Fundamental Physics: Experiments with a Precision Neutron Polarimeter

Ongoing

The NSR neutron polarimeter has limited two separate physical quantities, spin rotation due to parity non-conservation and long-range spin-dependent interactions. Firstly, we completed a successful run of an experiment to study the strong interaction using weak interaction properties of the neutron

Fundamental Physics: Magnetically Trapped Neutron Lifetime Experiment

Completed

A precise value for the neutron lifetime is required for several internal consistency tests of the SM including searches for right-handed currents and tests of the unitarity of the CKM mixing matrix. Measurements of neutron decay coefficients provide information on the vector and axial-vector

Fundamental Physics: Measurement of the Electron-Antineutrino Correlation in Neutron Decay (aCORN)

Completed

NIST in collaboration with Tulane University, Hamilton College, DePauw University, and Indiana University (the aCORN collaboration) carried out a measurement of the electron-antineutrino correlation “little a” in neutron beta-decay. Experiments of this type are designed to characterize final state

Fundamental Physics: Measurement of the Neutron Magnetic Dipole Moment Using Schwinger Scattering

Completed

Schwinger scattering is caused by the interaction between the neutron's magnetic dipole moment (MDM) and the atomic electric field inside a silicon crystal. The atomic electric field with a magnitude of 108 V/cm induces a tiny magnetic field in the rest frame of the moving neutron and thus a torque

Fundamental Physics: Neutron Lifetime Measurement Using a Cold Neutron Beam

Ongoing

In the beam technique, the lifetime is measured by counting the absolute number of protons within a fiducial volume while continuously monitoring the absolute neutron flux. We completed the first experiment in 2003, and the uncertainty in the result was dominated by systematic effects associated

Fundamental Physics: Precision Measurement of the Branching Ratio and Energy Spectrum of Radiative Neutron Decay

Completed

While inner-bremsstrahlung has been measured in nuclear beta decay and electron capture decays, it has only recently been observed in free neutron beta decay. In 2006, we reported the first observation of this radiative decay mode in the journal Nature. The experiment was completed at the NG-6

Fundamental Physics: A Precision Reactor Antineutrino Oscillation and Spectrum Measurement (PROSPECT)

Ongoing

Multiple improved global analyses of short baseline (O ~ 10-100 m) reactor antineutrino experiments carried out in 2011 suggested a significant deficit in the observed flux of antineutrinos compared to calculation. Similar anomalies had been observed in neutrino source experiments. It was suggested

Fundamental Physics: Search for Time Reversal Violation in Polarized Neutron Decay (emiT)

Completed

The stars and galaxies that make up our universe can only form if, during the initial moments after the Big Bang, there existed a slight dominance of matter over antimatter. It has been understood for some time that such an imbalance can only be explained if three conditions are met; a departure

GaN Nanowire Growth

Ongoing

Selective epitaxy: We have demonstrated that the diameter and placement of nanowires can be controlled by using silicon nitride (SiNx) masks on top of MBE-grown buffer layers (see figure). With electron beam lithography, several patterns with 3 mm die size that provide over 100,000 controlled

GaN Nanowire Metrology and Applications

Ongoing

GaN Nanowire LEDs: Our selective epitaxy methods and dopant characterization techniques have enabled fabrication of arrays of nanowire LEDs with controlled location and spatial layout. This development is complemented by modeling of the carrier flow and recombination. These LEDs were combined to

Gas Flow and Properties: Standards and Models for Flow Metering Semiconductor Gases at Flows from 10 μL/min to 1 L/min

Ongoing

Today the control of process gases in semiconductor fabrication is highly empirical. A type of flow meter called a mass flow controller (MFC) is used to regulate gas flow in order to produce the desired structures during chip fabrication. As semiconductor manufacturing advances, the requirements on

Gas properties for flow metering

Ongoing

NIST has two on-line databases that include accurate gas viscosity values: SEMIPROP - NIST Standard Reference Database 134 - for selected semiconductor process gases NIST Chemistry WebBook - for heat transfer fluids, components of air, components of natural gas [Note: as of February 2014, the NIST

viral vector illustration with RNA seen within the capsid

Gene Delivery Particle Analysis with High-Throughput Light Scattering Microscopy

Ongoing

This project aims to develop light-scattering microscopy methods for rapid, multi-attribute characterization of gene therapy particles at the single particle level. Emerging gene therapy treatments use gene delivery particles, such as viral vectors and non-viral carriers, to cure intractable

Graphene

Ongoing

Two remarkable features of graphene that are opening avenues to multiple applications are its high transport carrier mobility and the broad tunability of its electronic properties. Graphene charge carriers can be tuned continuously from negative carriers (i.e., electrons) to positive carriers (holes

Hardware Accelerators for Neural Networks

Ongoing

One promising candidate for building a hardware accelerator comes from the field of spintronics, where information is carried by electronic spin rather than charge. Magnetic tunnel junctions are particularly suited because of their multifunctionality and compatibility with standard integrated

Hardware Accelerators for Statistical Computing

Ongoing

Finding good solutions to many hard problems, like combinatorial optimization and traveling salesman problems, counterintuitively requires making the estimated solution worse before making it better. This situation results from many hard problems having many “solutions” that cannot be improved

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--Network security and robustness
--Network test and measurement
--Next generation networks
--Protocol design and standardization
--Software defined and virtual networks
-Software research
--Software testing
-Usability and human factors
--Accessibility
-Video analytics
-Virtual / augmented reality
-Visualization research
-Voting systems
Infrastructure
Manufacturing
-Additive manufacturing
-Factory communications
-Factory operations planning and control
-Interoperability in manufacturing
-Machining
-Manufacturing economics
-Manufacturing quality assurance
-Manufacturing systems design and analysis
-Monitoring, diagnostics and prognostics
-Process improvement
-Process measurement and control
-Product data
-Robotics
--Agility and adaptability
--Collaborative robots
--Dexterous grasping
--Manipulation
--Mobility and industrial autonomous vehicles
--Navigation / actuation / control
--Sensing and perception
-Supply chain
-Sustainable manufacturing
-Systems engineering
-Systems integration
-Technology commercialization
Materials
-Ceramics
-Composites
-Concrete / cement
-Materials characterization
--Composition and structure
--Mechanical properties
--Thermal properties
-Metals
-Modeling and computational material science
-Polymers
-Superconductors
Mathematics and statistics
-Experiment design
-Image and signal processing
-Modeling and simulation research
-Numerical methods and software
-Statistical analysis
-Uncertainty quantification
Metrology
-Amount of substance
-Dimensional metrology
-Electrical / electromagnetic metrology
-Flow metrology and rheology
-Force metrology
-Humidity metrology
-Ionizing radiation metrology
-Mass metrology
-Metric
-Optical / photometry / laser metrology
-Pressure and vacuum metrology
-Thermometry metrology
-Time and frequency metrology
-Weights and measures
Nanotechnology
-Nanobiotechnology
-Nanochemistry
-Nanoelectronics
-Nanofabrication / manufacturing
--Lithography
--Self-assembly
-Nanofluidics
-Nanomagnetics
-Nanomaterials
-Nanomechanics
-Nanometrology
-Nanophotonics
-Nanophysics
-Nanoplasmonics
Neutron research
Performance excellence
-Assessment tools and services
-Baldrige award
-Baldrige examiners
-Baldrige Framework and Criteria
-Best practices
-Leadership development
Physics
-Atomic / molecular / quantum
-Biological physics
-Condensed matter
-Electron physics
-Magnetics
-Nuclear physics
-Optical physics and communications
-Quantum information science
-Radiation
-Spectroscopy
-Thermodynamics
-Time and frequency
Public safety
-Chemical / Biological / Radiological / Nuclear / Explosives (CBRNE)
-First responder preparedness
-Law enforcement
-Public safety communications research
-Response robots
Resilience
-Community resilience
--Recovery
--Resilience metrics
-Disaster and failure studies
-Earthquake risk reduction
-Resilience economics
-Resilient materials
-Windstorm impact reduction
Standards
-Accreditation
-Calibration services
-Conformity assessment
-Documentary standards
-Frameworks
-Quality assurance
-Reference data
-Reference instruments
-Reference materials
-Standards education
Technology transfer
Transportation
-Aerospace
-Automotive