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126526 results found

Decennial Census of Island Areas: U.S. Virgin Islands Demographic Profile

Data provided by  United States Census Bureau

The U.S. Census Bureau conducts the Island Areas Censuses in partnership with the governments of American Samoa, the Commonwealth of the Northern Mariana Islands, Guam, and the U.S. Virgin Islands to comply with the legal requirements set forth in Title 13 of the United States Code and to meet the specific data needs of the Island Areas. The 2020 Island Areas Censuses counted people living in the U.S. Island Areas using a long-form questionnaire to meet the Island Areas' data needs for demographic, social, economic, and housing unit information.

Tags: census

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Source: http://api.census.gov/data/2020/dec/dpvi

Speed of Sound and Density of Difluoromethane

Data provided by  National Institute of Standards and Technology

Speed of sound and density measurements for difluoromethane. Speed of sound was measured in the liquid phase using a dual-path pulse-echo instrument at temperatures between 230 and 345 K, with pressures from 2.1 to 70 MPa. Vapor-phase density was measured using a dual-sinker densimeter instrument at temperatures from 240 to 340 K and pressures from 0.1 to 1.61 MPa.

Tags: Speed of Sound,density,DFM,R-32,HFC-32,low-GWP,Material property,Reference data

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Speed of Sound Measurements of Binary Mixtures of 1,1,1,2-Tetrafluoroethane (R-134a), 2,3,3,3-Tetrafluoropropene (R-1234yf), and trans-1,3,3,3-Tetrafluoropropene (R-1234ze(E)) Refrigerants

Data provided by  National Institute of Standards and Technology

Speed of sound data measured in the search for a Low-GWP Alternative Refrigerant Blends for HFC-134a. Speed of sound data are being used to improve current REFPROP mixture models for binary mixtures of R-134a, R-1234yf, and R-1234ze(E).

Tags: Refrigerant Blends,Speed of Sound,R-134a,R-1234ze(E),R-1234yf

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QFlow 2.0: Quantum dot data for machine learning

Data provided by  National Institute of Standards and Technology

Using a modified Thomas-Fermi approximation, we model a reference semiconductor system comprising a quasi-1D nanowire with a series of five depletion gates whose voltages determine the number of quantum dots (QDs), the charges on each of the QDs, as well as the conductance through the wire. The original dataset, QFlow lite, consists of 1 001 idealized simulated measurements with gate configurations sampling over different realizations of the same type of device.

Tags: machine learning,quantum dots,simulated data

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Reference Measurements of Error Vector Magnitude

Data provided by  National Institute of Standards and Technology

The experiment here was to demonstrate that we can reliably measure the Reference Waveforms designed in the IEEE P1765 proposed standard and calculate EVM along with the associated uncertainties. The measurements were performed using NIST's calibrated sampling oscilloscope and were traceable to the primary standards.We have uploaded the following two datasets. (1) Table 3 contains the EVM values (in %) for the Reference Waveforms 1--7 after performing the uncertainty analyses.

Tags: wireless communication,digitally modulated signals,quadrature amplitude modulation,error vector magnitude,measurement uncertainty,uncertainty analysis

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Linear Axis Testbed at IMS Center - Run-to-Failure Experiment 01

Data provided by  National Institute of Standards and Technology

A linear axis testbed at the Center for Intelligent Maintenance Systems (IMS Center) at the University of Cincinnati was run to failure (the detection of backlash) over one year with periodic data collected from an inertial measurement unit (IMU) on the carriage, two triaxial accelerometers on the ball nut, and the controller.

Tags: manufacturing,Industry 4.0,smart manufacturing,linear axis,machine tool,ball screw,backlash,sensor,accelerometer,inertial measurement unit,IMU,error motion,data analysis,monitoring,diagnostics

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PION: Password-based IoT Onboarding Over Named Data Networking

Data provided by  National Institute of Standards and Technology

This library implements a secure device onboarding protocol for Named Data Networking using SPAKE2 and NDNCERT. It contains three components corresponding to the roles defined in the protocol: device, authenticator, certificate authority.

Tags: Named Data Networking,Information Centric Networking,internet of things

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Automated Streams Analysis for Public Safety (ASAPS) Dataset (v0.75)

Data provided by  National Institute of Standards and Technology

The ASAPS Dataset includes eight continuous hours of data from across a fictitious ASAPS City representative of a normal day in a small city. The dataset includes multiple data types - video, audio, text, sensor, social media. The video data was created from a series of staged events, and then synchronized and augmented with recorded audio, simulated data for sensor, text, and social media related to the variety of emergency events across the city. The dataset represents a geographic area of approximately 68 square blocks.

Tags: artificial intelligence technologies,real-time analytics,emergency event detection,heterogenous data analysis,streaming data,UI/UX,data interface,public safety operations,situation awareness,resource deployment,communications systems of the future,state-of-the-art artificial intelligence,real-time computing,communications,data optimization,multimodal information analysis and visualization,decision management,advanced information visualization,user interface,and user experience

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Universal Cyber-Physical Systems Environment for Federation (UCEF)

Data provided by  National Institute of Standards and Technology

Internet of Things (IoT) is comprised of interacting networks of physical, computational, and human components that coordinate to fulfill time-sensitive functions in their environment. The development of these systems spans all industrial sectors and demands collaborative effort between research and development teams from multiple institutions. Realizing the full potential of IoT requires interoperability between heterogeneous systems and development processes supported by robust platforms for experimentation and testing across domains.

Tags: co-simulation,cyber-physical systems,high level architecture,internet of things,modeling and simulation,tool integration

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Source: https://github.com/usnistgov/ucef

Data set for Amontons-Coulomb-like slip dynamics in acousto-microfluidics

Data provided by  National Institute of Standards and Technology

This data set contains the data/information used to plot the graphs published in the 2022 Nat. Comm. article (titled "Amontons-Coulomb-like slip dynamics in acousto-microfluidics") of authors A. Quelennec, J.J. Gorman and D.R. Reyes.

Tags: Local viscous pressure,coefficient of transmission,acoustic loss,slip,viscosity,density,acoustic resistance,mass fraction,contact angle

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