TagScientific Measurement(6)
-
SEL Sound Exposure Level and Energy Metrics
An educational diagram illustrating acoustic measurement concepts including Sound Exposure Level (SEL), Lmax, LEQ, and energy, plotted as sound level (dB) over time (seconds). The graphic shows how SEL compresses a noise event's total energy into a normalized 1-second value, with Lmax appearing approximately 10dB above the LEQ reference line. -
MOV-UP report vehicle — UCAR atmospheric monitoring Prius
A white Toyota Prius Hybrid bearing the UCAR (University Corporation for Atmospheric Research) logo on its door, equipped with roof-mounted scientific instrumentation including sensors and probes. The vehicle is numbered 144 and appears to be configured for atmospheric or environmental data collection fieldwork. -
2001-12-19EXH AR017502: Guidance for the Use of Tables — Practical Quantitation Limits (PQLs), Method Detection Limits (MDLs), and PQL Comparisons to Method B Cleanup Levels
Ecology guidance document (AR017502, Part II of IV) explaining how to use PQL and MDL tables under the Model Toxics Control Act (MTCA). Covers Practical Quantitation Limits (PQLs), Method Detection Limits (MDLs), and comparisons to MTCA Method B cleanup levels for water and soil. Describes analytical methods from US EPA SW-846 (3000, 7000, 8000-8100, 8310, -
1975-01-01Selection of airport noise analysis method and exposure limits
This 1975 working paper from the Maryland State Aviation Administration examines methods for measuring and analyzing airport noise exposure, focusing on the Day-Night Average Sound Level (Ldn) as the recommended metric for assessing community noise impact. It reviews how sound characteristics such as magnitude, frequency, and time distribution affect human response, and evaluates criteria for acceptable noise limits based on effects including hearing loss, speech interference, sleep disturbance, and annoyance. The document also compares international noise exposure standards and proposes guidelines for land-use compatibility around airports. -
1975-01-01
Selection of airport noise analysis method and exposure limits
This 1975 working paper from the Maryland State Aviation Administration examines methods for measuring and analyzing airport noise exposure, focusing on the Day-Night Average Sound Level (Ldn) as the recommended metric for assessing community noise impact. It reviews how sound characteristics such as magnitude, frequency, and time distribution affect human response, and evaluates criteria for acceptable noise limits based on effects including hearing loss, speech interference, sleep disturbance, and annoyance. The document also compares international noise exposure standards and proposes guidelines for land-use compatibility around airports. -
Kelsh Projection Stereoplotter (1960)
Kelsh Projection Stereoplotter (1960). This was an automatic digital data input system used in conjunction with the photogrammetric plotter. The stereoplotter required two aerial photographs that have considerable overlap (60%). The photos are put onto transparent media and projected with a light source. Each image will be projected with overlap on the other. The operator,