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1

Ambient noise levels and reverberation times in Mississippi school rooms  

Science Journals Connector (OSTI)

Nine elementary school classrooms at three Mississippi public schools were selected at random for noise and reverberation time measures to monitor voluntary compliance with ANSI standard S12.60-2002 (Acoustical Performance Criteria Design Requirements and Guidelines for Schools). One-hour equivalent dBA noise levels and reverberation times (T60) were measured with SpectraPLUS Version 5.0 software. Measures were taken on separate days at each school in unoccupied classrooms with the HVAC system operating. For ambient noise measures an Audix TR40 omnidirectional microphone was placed in a 12 inch stand on a student's desk near the middle of the room and oriented toward the teacher's desk at a 45 degree angle. For the reverberation time measure a 400 watt loudspeaker (Yamaha BR15M) was placed on the teacher's desk about 3 meters from the microphone. Results showed that noise levels varied from 28 dBA to 51 dBA with broad spectra containing peaks at 120 Hz and harmonics. Five of nine classrooms had noise levels that exceeded the ANSI recommended level of 35 dBA. Reverberation times varied from .21 to .62 seconds; only one classroom exceeded the recommended minimal reverberation time of .6 seconds. Acoustical modifications to reduce noise levels and reverberation times will be addressed.

Edward L. Goshorn; Brett E. Kemker

2012-01-01T23:59:59.000Z

2

Ambient noise levels and reverberation times in Mississippi school rooms.  

Science Journals Connector (OSTI)

Nine elementary schoolclassrooms at three Mississippi public schools were selected at random for noise and reverberation time measures to monitor voluntary compliance with ANSI standard S12.60?2002 (Acoustical Performance Criteria Design Requirements and Guidelines for Schools). 1?h equivalent dBAnoise levels and reverberation times (T60) were measured with SPECTRAPLUS Version 5.0 software.Measures were taken on separate days at each school in unoccupied classrooms with the HVAC system operating. For ambient noisemeasures an Audix TR40 omnidirectional microphone was placed in a 12 in. stand on a student’s desk near the middle of the room and oriented toward the teacher’s desk at a 45 deg angle. For the reverberation time measure a 400 W loudspeaker (Yamaha BR15M) was placed on the teacher’s desk about 3 m from the microphone. Results showed that noise levels varied from 28 to 51 dBA with broad spectra containing peaks at 120 Hz and harmonics. Five of nine classrooms had noise levels that exceeded the ANSI recommended level of 35 dBA. Reverberation times varied from 0.21 to 0.62 s; only one classroom exceeded the recommended minimal reverberation time of 0.6 s. Acoustical modifications to reduce noise levels and reverberation times will be addressed.

Edward L. Goshorn; Megan N. Lucus; Brett E. Kemker

2010-01-01T23:59:59.000Z

3

E-Print Network 3.0 - ambient noise levels Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Tome 51, FBvrier 1990 Summary: aisdlAcoustique1990 A TECHNIQUE TO ESTIMATE THE THREE DIMENSIONAL DIRECTIONALITY OF UNDERSEA AMBIENT NOISE R... the three dimensional character...

4

Measurements of the source level of ambient noise due to wind  

Science Journals Connector (OSTI)

Measurements of the source level of wind?generated ambient noise in the deep ocean are presented for the frequency band 10–350 Hz. The data were obtained using a vertical line array deployed in the deep sound channel at various sites in the Northeast Pacific. The array response was steered vertically upward to measure the local sea surface noise and eliminate distant shipping noise. The beamforming was carried out in the frequency domain using a Kaiser?Bessel window to reduce sidelobe levels. The beam power levels obtained were referenced to a source level at the sea surface using a simple propagation model. The estimated wind noise levels N were fitted to the wind speed v at a specific frequency using a model of the form N = A + 20 n log v. The data indicate two we!l?defined regions with a weak wind?speed dependence at low wind speeds before wave breaking occurs and a stronger dependence at higher wind speeds. The values of n for wind speeds > 10 kn were in the range from 1.1–1.8. The source levels are compared with other measurements reported in the literature.

N. Ross Chapman; James W. Cornish

1990-01-01T23:59:59.000Z

5

Infrasonic ambient ocean noise: Northeast Pacific Ocean  

Science Journals Connector (OSTI)

Measurements of ocean ambient noise were made at three widely separated deep?water bottom locations in the N. E. Pacific at eight frequencies in the range from 2.5–20.0 Hz for 40 consecutive days. Concurrent data on wind speed and wave height were collected. Analysis indicates that the spectrum level of infrasonicnoise is linearly related to the log of the wind speed above a threshold level. There is evidence that the noise can be directly associated with the wind rather than through the surface waves it produces. [Work supported by ONR.

Rudolph H. Nichols

1985-01-01T23:59:59.000Z

6

Wind dependence of deep ocean ambient noise at low frequencies  

Science Journals Connector (OSTI)

A series of experiments has been carried out using a vertical line array to measure low?frequency ambient noise at deep ocean sites in the Northeast Pacific Ocean. Data in the band from 13 to 300 Hz were processed to obtain the array response directed vertically upward in order to study the noise due to local winds. The results indicate that there are two regimes of behavior depending on the wind speed v with the transition occurring at the onset of wave breaking v?10 kn. The noise level (NL) for a specific wind noise process was related to a power n of the wind speed according to the relationship NL=B+20n?log?v and the model parameters were obtained by fitting the data. The average value over the band was n=0.3 for wind speeds wind?generated noise was determined over the low?frequency band for wind speeds from 10–30 kn. The values are consistent with those of a recent analysis of available noise data [Kewley e t a l. ‘‘Low?frequency wind?generated ambient noise source levels ’’ J. Acoust. Soc. Am. 8 8 1894–1902 (1990)] and the model provides good agreement with wind noise measurements obtained with omni hydrophones in the southern oceans.

N. R. Chapman; J. W. Cornish

1993-01-01T23:59:59.000Z

7

Breaking wind waves as a source of ambient noise  

Science Journals Connector (OSTI)

A theoretical model for the prediction of ambient noise level due to collective oscillations of air bubbles under breaking wind waves is presented. The model uses a budget of the energy flux from the breaking waves to quantify acoustic power radiation by a bubble cloud. A shift of the noise spectra to lower frequency due to collective bubble oscillation is assumed. The model derives good estimates of the magnitude slope and frequency range of the noise spectra using the wind speed or height of breaking waves.

Pavlo Tkalich; Eng Soon Chan

2002-01-01T23:59:59.000Z

8

Depth dependence of ambient noise in the northeastern Pacific Ocean  

Science Journals Connector (OSTI)

Omnidirectional ambient noise levels were measured at two deep?water locations in the northeastern Pacific Ocean.Hydrophones were positioned throughout the water column at depths ranging from about 200 m below the surface to about 150 m above the sea bottom. Analyses of the data over the frequencies from 15 to 800 Hz show that at low frequencies the noise levels decrease with increasing depth. The decrease with depth is greater below the critical depth than it is in the sound channel. These low?frequency noise levels and their depth dependence are independent of the wind speed. At higher frequencies the noise levels and the depth dependence are controlled by the wind?generated noise. At low wind speeds there is a decrease in levels below the critical depth but above this depth both increases and decreases in levels with depth were noted. At these high frequencies during high wind speeds the noise levels not only rise but also fill the water column to the extent that there is little decrease in level with increasing depth even for the region below the critical depth.

Gerald B. Morris

1978-01-01T23:59:59.000Z

9

Low frequency deep ocean ambient noise trend in the Northeast Pacific Ocean  

Science Journals Connector (OSTI)

Concern about effects of anthropogenic noise on marine life has stimulated new studies to establish present-day oceannoise levels and compare them to noise levels from previous times. This paper reports on the trend in low-frequency (10–400 Hz) ambient noise levels and presents measurements made using a calibrated multi-element volume array at deep ocean sites in the Northeast Pacific from 1978 to 1986. The experiments provided spectral noise levels as well as horizontal and vertical noise directionality. The data presented here provide evidence that the trend derived from 1960s data extended to around 1980 but has since continued at a lower rate.

N. Ross Chapman; Andrea Price

2011-01-01T23:59:59.000Z

10

Some Applications of Meteorology to Underwater Ambient Noise Studies in Block Island Sound  

Science Journals Connector (OSTI)

Turbulent atmospheric boundary?layer theory is applied to wind observations made over a shallow?water embayment to explain variations in ambient noise levels. Broad?band ambient?noise data for sea states up to 3 obtained at a fixed receiving site are presented for a shallow water acoustic test range in Block IslandSound. Hourly wind?speed averages are analyzed by means of spectra and covariance functions in order to compare the frequency composition of the acoustic and meteorological data. The power spectrum computed from the record of ambient noise pressure level as a function of time has significant peaks centered on frequencies of 0.04 and 0.10. Similar peaks at the corresponding frequencies are present in the spectra of wind speeds. The results of this experiment suggest that for wind speed fluctuations of less than 0.33 nonlinear effects of the wind are relatively unimportant in the generation of ambient noise.

Llyod C. Huff; Robert G. Williams

1967-01-01T23:59:59.000Z

11

Brady 1D seismic velocity model ambient noise prelim  

SciTech Connect

Preliminary 1D seismic velocity model derived from ambient noise correlation. 28 Green's functions filtered between 4-10 Hz for Vp, Vs, and Qs were calculated. 1D model estimated for each path. The final model is a median of the individual models. Resolution is best for the top 1 km. Poorly constrained with increasing depth.

Robert J. Mellors

2013-10-25T23:59:59.000Z

12

Site and frequency dependence of ambient noise in the Northeastern Pacific Ocean  

Science Journals Connector (OSTI)

One?hour averages of omidirectional ambient noise measurements at 60 and 165 Hz are analyzed for two nearby deep ocean sites in the Northeastern Pacific during February and March 1981. Site A is a high noise site and is located near major east–west shipping lanes and near major Pacific storm paths. Site B is a lower noise site and is located approximately 450 nm from site A away from major shipping lanes and near major Pacific storm paths. The site and frequency dependence of ambient noise is found to be highly variable with shipping noise being totally dominant at 60 Hz at site A and stormnoise being totally dominant at 165 Hz at site B. Both shipping and stormnoise can dominate the 165?Hz site A or 60?Hz site B noise levels depending on weather conditions. Storms have a possible indirect effect on shipping noise since very low noise periods occur in between storms especially when the storm passes nearby the site. A limited number of WMO ships sampled indicate that ships slow down or stay in port during storms. Average omnidirectinal noise levels at 60 Hz at both sites and at 165 Hz at site A were 3 to 4 dB lower during a stormy week than they were during a relatively calm week. Array noise gain measurements at site B indicate that the coherence of noise during stormy periods is much less than it is during calm periods. Generally this implies that the increase in beam level at 165 Hz caused by stormnoise will be significantly less than corresponding increase in omnidirectional noise levels.

James H. Wilson

1983-01-01T23:59:59.000Z

13

Noise Levels due to Trains  

Science Journals Connector (OSTI)

Some fifty freight and passenger trains were investigated at distances between 25 and 1000 ft. The decrease of sound?pressure levels with increasing distance indicates that whistles are to be considered as point sources but engines and track noise are line sources out to distances comparable with the lengths of the source. All engines showed a pure tone in the region of 100 cps and freight engines a second tone at about 300 cps when pulling hard. Otherwise freight engines showed little change in level whatever the operating conditions. Noise from passenger engines showed marked changes in level since they operate with much more exaggerated changes in power than freight engines. Track noise depends on the rolling stock—freight cars and run?of?the?mill passenger cars have very similar noise spectra whereas the deluxe cars used on “prestige trains” have spectra lying 10 to 20 db lower in all frequency bands. All the cars have coil springs but the latter alone have hydraulic shock absorbers.

T. F. W. Embleton; G. J. Thiessen

1961-01-01T23:59:59.000Z

14

Contribution of iceberg sounds to the ambient noise budget in the South Pacific Ocean  

Science Journals Connector (OSTI)

On May 2002 C19 a 5500 km2 iceberg calved from the Ross Ice Shelf eventually drifting eastward into the open Pacific Ocean by 2008. As it sailed into warmer waters thermal and wind stresses caused the iceberg to crack and break apart. These resulting “icequakes” projected wideband acoustic energy into the water column influencing the regional ambient noise environment. Icequake noise was persistent and strong enough to be observed by NOAA’s eastern equatorial Pacific moored hydrophone (EEP-NW at 8N 110W) as well as the hydroacoustic station of International Monitoring System (IMS) on Juan Fernandez Island (H03N at 33.44S 78.91W). Elevated noise levels (maximum of ~+3 dB at NOAA’s EEP and ~+7 dB at IMS H03N hydrophones) were observed by both stations from early 2008 when C19a first appeared in the Pacific until it drifted into the Atlantic Ocean in early 2009. C19a’s icequake and calving activity was also most frequent during this same period. Seasonal changes and long-term trends in ambient noise levels at NOAA’s EEP-NW acoustic mooring (1996–2009) and IMS Juan Fernandez (2003–2010 years) and the unique acoustic role icebergs play in the Southern Ocean will be presented.

Haru Matsumoto; Robert Dziak; Minkyu Park; Won-Sang Lee; Tai-Kwan Lau; Matt Fowler

2013-01-01T23:59:59.000Z

15

Ambient noise seismic imaging Journal: McGraw Hill 2008 Yearbook of Science & Technology  

E-Print Network (OSTI)

ForReview Ambient noise seismic imaging Journal: McGraw Hill 2008 Yearbook of Science & Technology List of Authors: Ritzwoller, Michael Keywords: ambient noise, seismology, seismic tomography, Rayleigh wave, Love wave, surface wave Abstract: A recent innovation in seismic imaging based on using long time

Ritzwolle, Mike

16

Joint inversion of receiver function and ambient noise based on Bayesian theory  

E-Print Network (OSTI)

In this study, we present a method for the joint inversion of receiver function and ambient noise based on Bayesian inverse theory (Tarantola, 1987, 2005). The nonlinear inversion method of the complex spectrum ratio of ...

van der Hilst, Robert D.

17

Review paper Seismic interferometry and ambient noise tomography in the British Isles  

E-Print Network (OSTI)

Review paper Seismic interferometry and ambient noise tomography in the British Isles Heather. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 2. Theory and method of seismic interferometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 4.2. Seismic interferometry across the Scottish Highlands

18

Depth profiling ambient noise in the deep ocean  

E-Print Network (OSTI)

al. , 2005). The vertical profile of wind speed over the seavertical directionality…………… Depth-dependence of wind speedVertical noise directional density function versus depth. 93 Measured and acoustically estimated wind speeds.

Barclay, David Readshaw

2011-01-01T23:59:59.000Z

19

Environmental Resources of Selected Areas of Hawaii: Climate, Ambient Air Quality, and Noise (DRAFT)  

SciTech Connect

This report has been prepared to make available and archive background scientific data and related information on climate, ambient air quality, and ambient noise levels collected during the preparation of the environmental impact statement (EIS) for Phases 3 and 4 of the Hawaii Geothermal Project (HGP) as defined by the state of hawaii in its April 1989 proposal to Congress. The US Department of Energy (DOE) published a notice in the Federal Register on May 17, 1994 withdrawing its Notice of Intent of February 14, 1992, to prepare the HGP-EIS. Since the state of Hawaii is no longer pursuing or planning to pursue the HGP, DOE considers the project to be terminated. The report presents a general description of the climate and air quality for the islands of Hawaii (henceforth referred to as Hawaii), Maui, and Oahu. It also presents a literature review as baseline information on the health effects of hydrogen sulfide. the scientific background data and related information is being made available for use by others in conducting future scientific research in these areas. This report describes the environmental resources present in the areas studied (i.e., the affected environment) and does not represent an assessment of environmental impacts.

Lombardi, D.A.; Blasing, T.J.; Easterly, C.E.; Hamilton, C.B.

1994-06-01T23:59:59.000Z

20

Levels and Spectra of Transportation Vehicle Noise  

Science Journals Connector (OSTI)

In the years immediately preceding the war an informal program of the study of traffic transportationvehicle and industrial noise was undertaken in the Chicago area. In the recent past another but much more exhaustive program has been initiated and further and more detailed work has now been done. One phase of the work has been a study of the noise within the various types of vehicles generally employed in transportation. These include older and newer type trolley cars and trolley buses elevated lines and subway cars suburban electric and steam trains and passenger automobiles.Measurements were made in these vehicles not only of total sound level but of components in octave bands in the audible frequency range. The work has therefore permitted a comparison of the acoustic spectra in these vehicles and curves to show these characteristic differences will be shown.

G. L. Bonvallet

1949-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Comparison of predicted and measured noise levels for refinery units  

Science Journals Connector (OSTI)

Predicting noise levels from new refinery units is a vital part of environmental assessment and designing units to meet noise limits. The accuracy of those noise predictions is a very important concern. The simplest way to assess the accuracy of predictions is to compare predicted and measured noise levels. This is usually difficult because measured levels are strongly affected by noise from adjacent units and by atmospheric effects on sound propagation. Further actual noise levels of significant sources often deviate from expected levels used in the noise prediction model. Thus to meaningfully compare predicted and measured levels the actual noise source levels for the major sources atmospheric conditions and noise levels from adjacent units must all be accounted for. Predicted and measured levels are compared for two large refinery units. Measurements were made at locations where noise from adjacent units has little effect and close enough so that atmospheric conditions have little impact on the measured levels. Measured operational noise levels of major sources were used to update the noise prediction model. Accuracy of the predictions is evaluated.

Frank H. Brittain; Mark M. Gmerek

1998-01-01T23:59:59.000Z

22

Levels and Spectra of Transportation Vehicle Noise  

Science Journals Connector (OSTI)

In the recent past a program was initiated to survey vehicle traffic and industrial noise in the Chicago area. The phase on noise of vehicles has been completed. The investigation included street elevated and subway cars; diesel steam and electric trains; and motor buses trucks and automobiles.

G. L. Bonvallet

1950-01-01T23:59:59.000Z

23

The structure of the crust and uppermost mantle beneath the western US revealed by ambient noise and earthquake tomography  

E-Print Network (OSTI)

1 The structure of the crust and uppermost mantle beneath the western US revealed by ambient noise.Shapiro2 1 ­ Center for Imaging the Earth's Interior, Department of Physics, University of Colorado at Boulder, Boulder, CO 80309-0390, email:yingjie.yang@colorado.edu, phone: 303-735-1850 2 ­ Institut de

Ritzwolle, Mike

24

Passive acoustics embedded on gliders—Weather observation through ambient noise  

Science Journals Connector (OSTI)

Underwater gliders can provide high resolution water temperature and salinity profiles. Being able to associate them with a surface weather conditions estimation would allow to better study sea-air interactions. Since in-situ observations of the marine meteorological parameters are difficult the development of a glider embedded weather sensor has been studied based on the WOTAN approach. In the 1–30 kHz frequency range the background underwater noise is dominated by wind generated noise. Focusing on the sound pressure level at 5 8 10 and 20 kHz allows to estimate the wind speed. Thus deploying a glider with an embedded hydrophone gives an access to the surface weather conditions around its position. We have deployed gliders in the Mediterranean sea with passive acoustic monitoring devices onboard. Four months of data have been recorded. Wind speed estimations have been confronted to weather buoys observations and atmospheric models predictions. Wind estimates have been obtained with a ~2 m/s error. A specific emphasis has been placed on the robustness of the processing through multi frequencies analysis and depth induced attenuation correction. A downscaling study has been performed on the acoustic sampling protocol in order to meet the low energy consumption glider standards for a future real time embedded processing. The glider generated noise and its vertical movement are not perturbing the estimation. Moreover the surface behavior of the Slocum gliders allows an estimation of the wind direction.

2014-01-01T23:59:59.000Z

25

Wideband noise observed at ground level in the auroral region  

SciTech Connect

A sideband noise event was detected at ground level from the Andoya Rocket Range in Norway in January 1989. The signals were observed on four commercial communication receivers (tuned to 159, 515, 905, and 1200 kHz), an ionosonde (200-kHz to 3.5-MHz interference-free observations) and a riometer (32.5 MHz). The event, which occurred during a period of magnetic disturbance near magnetic midnight, was the only one observed during nearly 3 weeks of operations. This low frequency-of-occurrence is attributed partly to high local noise levels. The ease with which this event was identified on the ionograms produced by the local ionosonde suggests that routine ionosonde recordings should be inspected in search for such events. Such an effort would enhance existing research directed toward developing techniques for identifying quiet communication channels and help to identify the origin and frequency-of-occurrence of high-latitude wideband noise events. 20 refs.

Benson, R.F.; Desch, M.D. (NASA, Goddard Space Flight Center, Greenbelt, MD (United States))

1991-08-01T23:59:59.000Z

26

Evaluation of wind turbine noise levels and impact studies  

Science Journals Connector (OSTI)

Measured A?weighted sound levels at 125?ft distance for individual wind turbines with 20? to 120?kW power ratings are typically in the range 65–75 dB at moderate to high power output conditions (20–30?mph wind speeds). Tonelike sounds in the 300? to 1000?Hz frequency range often are clearly audible. Cyclical fluctuations of 10 dB in low?frequency noise levels are propagated by some downwind?type turbines. The random aerodynamic rotor noisesounds like a roar the gear box noisesounds like a whine and the low?frequency noise fluctuations sound like “thump?thump” or “whoosh?whoosh.” All of these wind turbinenoises are propagated from existing wind farms to residential areas and are judged intrusive and annoying. Measurements and predictions of wind turbinenoise submitted with applications for wind farm development have often contained errors which understated the noise levels by 3–10 dB. These errors were due to noisemeasurements at minimal wind speeds and turbine power and faulty modeling procedures. Simple analytical expressions have been developed which quickly and accurately predict the noise levels for large turbine arrays.

Samuel R. Lane

1986-01-01T23:59:59.000Z

27

E-Print Network 3.0 - ambient urban levels Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Summary: that seven major sources of ambient PM10 were urban fugitive dust, crustal soil, coal combustion, secondary... diameter of 10 m or less) exceeded the level II of...

28

Confidence Intervals Estimation in the Identification of Electromechanical Modes from Ambient Noise  

E-Print Network (OSTI)

from ambient data resulting from random load switching throughout the day in power systems effectiveness in reducing the number of trials, which would be beneficial for on-line power system monitoring-- Power system oscillations, modal analysis, power system monitoring, system identification, prediction

Cañizares, Claudio A.

29

Comparison of measured Concorde supersonic transport aircraft noise levels to regulatory levels and health and welfare criteria  

Science Journals Connector (OSTI)

A considerable quantity of measured noise level data has been collected for approach and take?off operations of the Anglo?French Concorde Supersonic Transport (SST) aircraft. The largest body of SST noise data has been obtained by the FAA at Dulles International Airport in Virginia and is generally in the form of maximum A?weighted noise level and Effective Perceived Noise Level. However during test flight operations at various airports in the U. S. (in Alaska California Texas and other states) noise data in the form of various noise rating scales including maximum A?weighted and C?weighted level single event noise exposure level (SENEL) perceived noise level (PNL) effective perceived noise level (EPNL) and others have been obtained. There is a requirement to compare the corresponding values of the various noise rating scales to determine ff there are consistent relationships (differences) between them so the noise levels in terms of one rating scale can be predicted from noise levels in the form of another rating scale. This is particularly important since most of the SST data collected is in terms of PNL or EPNL and the proposal in Congressman Glen Anderson's bill (HR 8729) to standardize all noise data to the average day?night level (L dn) will require converting to the SENEL scale. Therefore the available SST data were evaluated and summarized to provide a comparison to the FAA FAR 36 noise limits and to establish conversion factors for transferring from one noise rating scale to another.

S. R. Lane

1978-01-01T23:59:59.000Z

30

Near-surface study at the Valhall oil field from ambient noise surface wave tomography  

Science Journals Connector (OSTI)

......there is still a strong domination of the 155 azimuth even...Fourier transform. We set up the time window deltaT...frequency band. 3.2 Locating noise sources at intermediate...vertical-to-vertical data set and allows us to significantly...interpretation of the full set of frequencies is out......

A. Mordret; M. Landès; N. M. Shapiro; S. C. Singh; P. Roux; O. I. Barkved

2013-01-01T23:59:59.000Z

31

Is ambient noise tomography across ocean basins possible? Fan-Chi Lin,1  

E-Print Network (OSTI)

, at ocean bottom sites at periods above $25 sec. Citation: Lin, F.-C., M. H. Ritzwoller, and N. M. Shapiro and Nikolai M. Shapiro2 Received 17 April 2006; revised 31 May 2006; accepted 7 June 2006; published 20 July of several seconds to well in excess of 150 sec [e.g., Shapiro and Campillo, 2004]. This noise is coherent

Shapiro, Nikolai

32

High-level numerical simulations of noise in CCD and CMOS photosensors: review and tutorial  

E-Print Network (OSTI)

In many applications, such as development and testing of image processing algorithms, it is often necessary to simulate images containing realistic noise from solid-state photosensors. A high-level model of CCD and CMOS photosensors based on a literature review is formulated in this paper. The model includes photo-response non-uniformity, photon shot noise, dark current Fixed Pattern Noise, dark current shot noise, offset Fixed Pattern Noise, source follower noise, sense node reset noise, and quantisation noise. The model also includes voltage-to-voltage, voltage-to-electrons, and analogue-to-digital converter non-linearities. The formulated model can be used to create synthetic images for testing and validation of image processing algorithms in the presence of realistic images noise. An example of the simulated CMOS photosensor and a comparison with a custom-made CMOS hardware sensor is presented. Procedures for characterisation from both light and dark noises are described. Experimental results that confirm...

Konnik, Mikhail

2014-01-01T23:59:59.000Z

33

Biomass, Flavonol Levels and Sensory Characteristics of Allium cultivars Grown Hydroponically at Ambient and  

E-Print Network (OSTI)

04ICES-136 Biomass, Flavonol Levels and Sensory Characteristics of Allium cultivars Grown growth chambers to evaluate the effect of elevated CO2 (1200 ppm) versus ambient CO2 (400 ppm) on biomass planting (dap). Regardless of cultivar or dap, plants grown at elevated CO2 had greater biomass

Paré, Paul W.

34

Effects of ambient and boat noise on hearing and communication in three fish species living in a marine protected area (Miramare, Italy)  

E-Print Network (OSTI)

in a marine protected area (Miramare, Italy) Antonio Codarin a , Lidia E. Wysocki b , Friedrich Ladich b, Austria c Etho-ecology Marine Laboratory, Natural Marine Reserve of Miramare ­ WWF, Viale Miramare 349 Ambient noise Hearing a b s t r a c t The WWF-Natural Marine Reserve of Miramare (Trieste, Italy

Ladich, Friedrich

35

LNG carrier underwater noise in Baffin Bay  

Science Journals Connector (OSTI)

Large powerful liquid natural gas carriers may soon ply Arctic waters year round. Concern has been expressed over the impact the resulting noise will have on Arctic marine life. This study includes estimates of LNG carrier?radiated noise source levels and resulting sound levels at a given distance from the ship for a number of operating conditions. Measurements of sound propagation and ambient noise conditions in Baffin Bay are used to estimate the shipnoise levels in relation to the summertime noise background.

L. J. Leggat; H. M. Merklinger; J. L. Kennedy

1981-01-01T23:59:59.000Z

36

Infrasonic?Noise Power Level and Wind?Velocity Correlation Study  

Science Journals Connector (OSTI)

Measurements of infrasonic?noise power and analyses of wind?velocity data were made. Correlation was found between infrasonic?noise power levels at a particular location and wind?velocity measurements taken at a distance of approximately 11 miles away. This information is useful for studying infrasonic?signal data improving the signal?to?noise ratio in physical measurements of infrasonic signals and for the selection of sites for infrasonic stations.

Howard S. Bowman

1965-01-01T23:59:59.000Z

37

Measurement of noise levels in the vicinity of occupationally exposed workers  

E-Print Network (OSTI)

MEASUREMENT OF NOISE LEVELS IN THE VICINITY OF OCCUPATIONALLY EXPOSED WORKERS A Thesis by JERRY FELTNER LAUDERDALE Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER... OF SCIENCE Nay 1976 Najor Subject: Industrial Hygiene MEASUREMENT OF NOISE LEVELS IN THE VICINITY OF OCCUPATIONALLY EXPOSED WORKERS A Thesis hy JERRY FELTNER LAUDERDALE Approved as to style and content hy: hairman Committ ) ead of Department...

Lauderdale, Jerry Feltner

2012-06-07T23:59:59.000Z

38

Environmental noise of a nuclear power plant and its substations  

Science Journals Connector (OSTI)

In order to fulfill government requirements for construction of a nuclear power plant an environmental noiseimpact as?assessment has been conducted. Ambient noise was measured continuously for 24 hour periods at the plant and substation sites and in the vicinity. Week long surveys were performed in each of the four seasons. A statistical interpretation of construction noise accounts for variability of construction equipment usage its location and range of sound pressure levels. Histograms of construction noise and measured ambient noise are added to obtain the statistical representation of the predicted construction ambient noise. Operational noise of the plant is similarly predicted. The predicted noise contours of both operation and construction noise are formulated on the topographic maps. Meteorologic and topographic effects on the noise data are discussed.

E. E. Dennison; R. E. Maier; J. W. McGaughey; S. P. Ying

1976-01-01T23:59:59.000Z

39

Performance Evaluation of Reverberant Chamber Background Noise Levels  

E-Print Network (OSTI)

?to?simplify?the?huge?range?of?products.?All ?products?shall?be?rated?in?accordance? with?the?HVI?rating?system.?According?to?this,?all? devices?with?loudness?up?to?0.3?sones? shall?be?rated?as??below?0.3?sones?.?All?devices?fr om?0.4?sones?up?to?1.5?sones?shall?be? rounded? to? the? nearest? 0...?head,?efficiency?and?specific?sound?power? level.? ?The?sound?power?of?a?fan?can? be?approximated?using?the?following?equation?(ASA?1 997):? Lw?=?K w?+?10?log?Q?+?20?log?P?+?BFI?+C N? where,? Lw?=??Sound?Power?Level?of?the?fan?(dB)? Kw?? =??Specific?Sound?Power?Level?(dB)? It?is ? defined...

Ravi, Sankaranarayana

2012-02-14T23:59:59.000Z

40

Arctic ocean long-term acoustic monitoring : ambient noise, environmental correlates, and transients north of Barrow, Alaska  

E-Print Network (OSTI)

ice floes. Figure 4.6 – Thermal fracturing due to atmospheric coolingsea ice prior to the onset of heat loss and rapid cooling (atmospheric cooling. Wind-Driven Noise During fall, the ice

Roth, Ethan H.

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

A proposed system to automatically control audio sound-to-noise levels  

E-Print Network (OSTI)

A PROPOSED SYSTEM TO AUTOMATICALLY CONTROL AUDIO SOUND TO NOISE LEVELS A Thesis ~ ]3y GARY 8% NEINAST Submitted to the Graduate Sohool of the Agrioultural and Meohanioal College of Texas in partial fulfillment of the requirements... for the degree oi' MASTER OP SCIENCE August 1957 Major Sub]eot'f Eleotrioal Engineering A PROPOSED SYSTEM TO AUTOMATICALLY CONTROL AUDIO SOUND-TO-NOISE LEVELS k Thesis QARY S. NEINAST Approved as to style and content by& islay a FBNR o 0 ee e epsx' ne...

Neinast, Gary Strickland

2012-06-07T23:59:59.000Z

42

E-Print Network 3.0 - ambient laboratory conditions Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

and Information Sciences 8 Ambient Noise Tomography in the Western US using Data from the EarthScopeUSArray Transportable Array Summary: 1 Ambient Noise Tomography in...

43

E-Print Network 3.0 - ambient ozone levels Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

level ozone. Lesson 2: Ozone Formation... , power plants and industry all emit air pollution that forms ... Source: Royer, Dana - Department of Earth and Environmental Sciences,...

44

Contribution of floor treatment characteristics to background noise levels in health care facilities, Part 1  

Science Journals Connector (OSTI)

Acoustical tests were conducted on five types of commercial-grade flooring to assess their potential contribution to noise generated within health care facilities outside of patient rooms. The floor types include sheet vinyl (with and without a 5 mm rubber backing) virgin rubber (with and without a 5 mm rubber backing) and a rubber-backed commercial grade carpet for comparison. The types of acoustical tests conducted were ISO-3741 compliant sound power level testing (using two source types: a tapping machine to simulate footfalls and a rolling hospital cart) and sound absorption testing as per ASTM-C423. Among the non-carpet samples the material type that produced the least sound power was determined to be the rubber-backed sheet vinyl. While both 5 mm-backed samples showed a significant difference compared to their un-backed counterparts with both source types the rubber-backed sheet vinyl performed slightly better than the rubber-backed virgin rubber in the higher frequency bands in both tests. The performance and suitability of these flooring materials in a health care facility compared to commercial carpeting will be discussed. [Work supported by Paul S. Veneklasen Research Foundation.

Adam L. Paul; David A. Arena; Eoin A. King

2014-01-01T23:59:59.000Z

45

Predicting underwater radiated noise levels due to the first offshore wind turbine installation in the United States  

Science Journals Connector (OSTI)

Noise generated by offshore impact pile driving radiates into the air water and sediment. Predicting noise levels around the support structures at sea is required to estimate the effects of the noise on marine life. Based on high demands developing renewable energy source the United States will begin the first pile driving within one to two years. It is necessary to investigate acoustic impact using our previously verified coupled Finite Element (Commercial FE code Abaqus) and Monterey Miami Parabolic Equation (2D MMPE) models [J. Acoust. Soc. Am. 131(4) 3392 (2012)]. In the present study we developed a new coupled FE-MMPE model for the identification of zone of injury due to offshore impact pile driving. FE analysis produced acoustic pressure outputs on the surface of the pile which are used as a starting field for a long range 2D MMPE propagation model. It calculates transmission loss for N different azimuthal directions as function of distance from the location of piling with the inputs of corresponding bathymetry and sediment properties. We will present predicted zone of injury by connecting N different distances of equivalent level fishes may get permanent injury due to the first offshore wind farm installation in the United States.

James H. Miller

2013-01-01T23:59:59.000Z

46

Predicting underwater radiated noise levels due to the first offshore wind turbine installation in the U.S.  

Science Journals Connector (OSTI)

Noise generated by offshore impact pile driving radiates into the air water and sediment. Predicting noise levels around the support structures at sea is required to estimate the effects of the noise on marine life. Based on high demands developing renewable energy source the United States will begin the first pile driving within one to two years. It is necessary to investigate acoustic impact using our previously verified coupled Finite Element (Commercial FE code Abaqus) and Monterey Miami Parabolic Equation (2D MMPE) models (J. Acoust. Soc. Am. 131(4) p. 3392 2012). In the present study we developed a new coupled FE-MMPE model for the identification of zone of injury due to offshore impact pile driving. FE analysis produced acoustic pressure outputs on the surface of the pile which are used as a starting field for a long range 2D MMPE propagation model. It calculates transmission loss for N different azimuthal directions as function of distance from the location of piling with the inputs of corresponding bathymetry and sediment properties. We will present predicted zone of injury by connecting N different distances of equivalent level fishes may get permanent injury due to the first offshore wind farm installation in the U.S..

Huikwan Kim; James H. Miller; Gopu R. Potty

2013-01-01T23:59:59.000Z

47

Blue whale response to underwater noise from commercial ships  

E-Print Network (OSTI)

to investigate the effect of ship traffic on ambient noiseThis study investigates the effect of ship noise on signalmaneuvering effects on a surface ship underwater acoustic

McKenna, Megan Frances

2011-01-01T23:59:59.000Z

48

Integration of Noise and Coda Correlation Data into Kinematic...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

noise correlation Green's functions (NCF) obtained from MEQs and ambient noise and coda-wave interferometry to image the physical properties of geothermal reservoirs and detect and...

49

Ocean noise in the tropical and subtropical Pacific Ocean  

Science Journals Connector (OSTI)

Ocean ambient noise is well studied in the North Pacific and North Atlantic but is poorly described for most of the worlds' oceans. Calibrated passive acoustic recordings were collected during 2009–2010 at seven locations in the central and western tropical and subtropical Pacific. Monthly and hourly mean power spectra (15–1000?Hz) were calculated in addition to their skewness kurtosis and percentile distributions. Overall ambient noise at these seven sites was 10–20?dB lower than reported recently for most other locations in the North Pacific. At frequencies 200?Hz with higher levels recorded in the winter than in the summer. Several species of baleen whales humpback (Megaptera novaeangliae) blue (Balaenoptera musculus) and fin (B. physalus) whales also contributed seasonally to ambient noise in characteristic frequency bands.

Ana Širovi?; Sean M. Wiggins; Erin M. Oleson

2013-01-01T23:59:59.000Z

50

Measurement of the ambient in relocateable modular classrooms.  

Science Journals Connector (OSTI)

The ambient in a classroom consists of noises internal to the classroom (e.g. HVAC lighting IT equipment refrigerators and fish tank pumps) and noises external to the classroom (e.g. street traffic aircraft children in the playground and adjacent classroomnoise). Currently ANSI S12.60 Classroom Acoustics requires that the A?weighted ambient level unoccupied be less than 35 dB at the noisiest position in the classroom. A basic reasonable procedure to implement the required measurements has been developed and tested. The authors find that the procedures developed can be readily used by inexperience but technically oriented individuals. The procedure separates the measurement of internal and external noises into two measurements typically at different positions. Because the two noises are variable unrelated in position and uncorrelated in time it does not make sense to combine them in any fashion. Rather in the procedure to be recommended by WG 68 the two measurements are to be reported and evaluated separately against the 35 dB criterion. Other notable changes are expansion of the measurement hours to include busy traffic periods (high environmental noise periods) prior to and after school and on Saturdays and implementation of HVAC duty cycles to better estimate a typical A?weighted hourly equivalent level from HVAC equipment (the subject of a companion paper).

2008-01-01T23:59:59.000Z

51

Ambient Air Quality Criteria (Manitoba, Canada)  

Energy.gov (U.S. Department of Energy (DOE))

The Manitoba Ambient Air Quality Criteria schedule lists maximum time-based pollutant concentration levels for the protection and preservation of ambient air quality within the Province of Manitoba...

52

Saturation of two-level systems and charge noise in Josephson junction qubits Magdalena Constantin,1,* Clare C. Yu,1 and John M. Martinis2  

E-Print Network (OSTI)

Saturation of two-level systems and charge noise in Josephson junction qubits Magdalena Constantin to using superconducting Josephson junction qubits to construct quantum computers. Recent experiments7.094520 PACS number s : 74.40. k, 03.67.Pp, 77.22.Gm, 85.25.Cp I. INTRODUCTION The superconducting Josephson

Martinis, John M.

53

Radiated noise characteristics of M/V OVERSEAS HARRIETTE, a modern cargo ship  

Science Journals Connector (OSTI)

Low?frequency ambient noise in the ocean is often influenced by radiated noise from merchant shipping. In an effort to quantify this noise a series of extensive and carefully planned measurements were made of the radiated noise of M/V OVERSEAS HARRIETTE a 25 525?deadweight ton 567?ft cargo ship powered by a direct?drive low?speed diesel engine. This ship and its power plant are typical of many modern merchant ships. The radiated noise data show high?level tonal frequencies from the ship's service diesel generator main engine firing rate and blade rate harmonics due to propeller cavitation. Directivity measurements taken at many angles under the ship indicate that the radiation is generally dipole in form at lower frequencies as expected. There are some departures from this pattern that may indicate hull interactions. Blade rate fundamental levels show good agreement with predicted levels. [Work supported by NRL.

Paul T. Arveson; David J. Vendittis

1991-01-01T23:59:59.000Z

54

The impact of an urban park on air pollution and noise levels in the Mediterranean city of Tel-Aviv, Israel  

Science Journals Connector (OSTI)

Abstract This study examines the influence of urban parks on air quality and noise in the city of Tel-Aviv, Israel, by investigation of an urban park, an urban square and a street canyon. Simultaneous monitoring of several air pollutants and noise levels were conducted. The results showed that urban parks can reduce NOx, CO and PM10 and increase O3 concentrations and that park's mitigation effect is greater at higher \\{NOx\\} and PM10 levels. During extreme events, mean values of 413ppb \\{NOx\\} and 80 ?G/m3 PM10 were measured in the street while mean values of 89ppb \\{NOx\\} and 24 ?G/m3 PM10 were measured in the park. Whereas summer highest O3 values of 84ppb were measured in the street, 94ppb were measured in the park. The benefit of the urban park in reducing \\{NOx\\} and PM10 concentrations is more significant than the disadvantage of increased O3 levels. Furthermore, urban parks can reduce noise by ?5 dB(A).

Pninit Cohen; Oded Potchter; Izhak Schnell

2014-01-01T23:59:59.000Z

55

Infrasonic sea noise at the Mid?Atlantic Ridge near 37 °N  

Science Journals Connector (OSTI)

Underwater ambient noise spectra spectrum levels and statistics are described for data continuously recorded in the 5–32?Hz band for 176 h. These measurements were made using two ocean bottom seismographs located in 2478 m of water within the seismically active median valley of the Mid?Atlantic Ridge near 37 °N. Laboratory tests of the H?38 hydrophone show that flow noise levels developed by a 0.3 knot current—the maximum speed anticipated in the median valley—did not exceed the electronic noise level of the recording instrument. Over 500 underwater earthquakes were detected and epicenters were estimated to lie within about 20 km of the instruments. Seismic disturbances raised noise levels at least 20 dB across the acoustic band varied in local magnitude from 1.2 to 2.5 persisted for as long as 2 min and occurred on the average of 2.9 events/h. Sound pressure spectrum levels averaged over the entire recording period and compared to shipping noise curves proposed by Wenz and Urick infer that infrasonic and low?frequency noise are dominated by distant shipping traffic noise. [This work was sponsored by Naval Electronics Systems Command Code 320.

J. R. McGrath

1975-01-01T23:59:59.000Z

56

Investigation of Noise Level and Penetration Rate of Pneumatic Drill vis-à-vis Rock Compressive Strength and Abrasivity  

Science Journals Connector (OSTI)

In this paper, detailed studies were carried out to determine the influence of rock properties on the sound level produced during pneumatic drilling. Further, investigation was also carried out on the effect of t...

S. B. Kivade; Ch. S. N. Murthy; H. Vardhan

2014-10-01T23:59:59.000Z

57

Radiated noise characteristics of a modern cargo ship  

Science Journals Connector (OSTI)

Extensive measurements were made of the radiated noise of M/V OVERSEAS HARRIETTE a bulk cargo ship (length 173 m displacement 25?515 tons) powered by a direct-drive low-speed diesel engine—a design representative of many modern merchant ships. The radiated noise data show high-level tonal frequencies from the ship’s service diesel generator main engine firing rate and blade rate harmonics due to propeller cavitation. Radiated noise directionality measurements indicate that the radiation is generally dipole in form at lower frequencies as expected. There are some departures from this pattern that may indicate hull interactions. Blade rate source level (174 dB re 1 ?Pa/m at 9 Hz 16 knots) agrees reasonably well with a model of fundamental blade rate radiation previously reported by Gray and Greeley but agreement for blade rate harmonics is not as good. Noise from merchant ships elevates the natural ambient by 20–30 dB in many areas; the effects of this noise on the biological environment have not been widely investigated.

Paul T. Arveson; David J. Vendittis

2000-01-01T23:59:59.000Z

58

Measurement of the underwater noise levels generated from marine piling associated with the installation of offshore wind turbines.  

Science Journals Connector (OSTI)

Marine piling is the most commonly used method for the installation of offshore wind turbines in the shallow coastal waters in the UK and consists of steel mono?piles being driven into the seabed using powerful hydraulic hammers. This is a source of impulsive sound of potentially high level that can travel a considerable distance in the water column and has the potential for impact on marine life. This presentation describes methodologies developed for measurement of marine piling and for the estimation of the energy source level. Measurements are presented for piles of typically 5 m in diameter driven by hammers with typical strike energies of 1000 kJ. Data were recorded as a function of range from the source using vessel?deployed hydrophones and using fixed acoustic buoys that recorded the entire piling sequence including soft start. The methodology of measurement is described along with the method of estimation of the energy source level. Limitations and knowledge gaps are discussed.

Pete D. Theobald; Stephen P. Robinson; Michael A. Ainslie; Christ A. F. de Jong; Paul A. Lepper

2011-01-01T23:59:59.000Z

59

Seismic gravity-gradient noise in interferometric gravitational-wave detectors  

E-Print Network (OSTI)

When ambient seismic waves pass near an interferometric gravitational-wave detector, they induce density perturbations in the earth which produce fluctuating gravitational forces on the interferometer's test masses. These forces mimic a stochastic background of gravitational waves and thus constitute noise. We compute this noise using the theory of multimode Rayleigh and Love waves propagating in a layered medium that approximates the geological strata at the LIGO sites. We characterize the noise by a transfer function $T(f) \\equiv \\tilde x(f)/\\tilde W(f)$ from the spectrum of direction averaged ground motion $\\tilde W(f)$ to the spectrum of test mass motion $\\tilde x(f) = L\\tilde h(f)$ (where $L$ is the length of the interferometer's arms, and $\\tilde h(f)$ is the spectrum of gravitational-wave noise). This paper's primary foci are (i) a study of how $T(f)$ depends on the various seismic modes; (ii) an attempt to estimate which modes are excited at the LIGO sites at quiet and noisy times; and (iii) a corresponding estimate of the seismic gravity-gradient noise level. At quiet times the noise is below the benchmark noise level of ``advanced LIGO interferometers'' (although not by much near 10 Hz); it may significantly exceed this level at noisy times. The lower edge of our quiet-time noise is a limit beyond which there is little gain from further improvements in vibration isolation and thermal noise, unless one also reduces seismic gravity-gradient noise. Two methods of reduction are discussed: monitoring the earth's density perturbations, computing their gravitational forces, and correcting the data for those forces; and constructing narrow moats around the interferometers' test masses to shield out the fundamental-mode Rayleigh waves, which we suspect dominate at quiet times.

Scott A. Hughes; Kip S. Thorne

1998-06-03T23:59:59.000Z

60

E-Print Network 3.0 - airborne acoustical noise Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

and lidar sensors. Consequently, the methodology for instru- ment calibration, noise reduction... in the data processing sequence. For an acoustic system, ambient ... Source:...

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Ambient intelligence: A survey  

Science Journals Connector (OSTI)

In this article we survey ambient intelligence (AmI), including its applications, some of the technologies it uses, and its social and ethical implications. The applications include AmI at home, care of the elderly, healthcare, commerce, and business, ... Keywords: Ambient intelligence, agents, assisted living, multiagent systems, social and ethical issues

Fariba Sadri

2011-10-01T23:59:59.000Z

62

Gas turbine noise control  

Science Journals Connector (OSTI)

The use of gas turbine powered generators and pumping stations are likely to increase over the next two decades. Alternative fuel systems utilizing fluidized coal beds are likely in the near future and direct combustion of pulverized coal is also a possibility. The primary problem of generally unacceptable noise levels from gas turbine powered equipment affects both community noise and hearing conservation alike. The noise criteria of such plant remain a significant design factor. The paper looks at the technical and historical aspects associated with the noise generation process and examines past present and possible future approaches to the problem of silencing gas turbine units; adequately specifying the acoustical criteria and ratings; evaluates the techniques by which these criteria should be measured; and correlates these with the typical results achieved in the field.

Louis A. Challis and Associates Pty. Ltd.

1979-01-01T23:59:59.000Z

63

Underwater noise from three types of offshore wind turbines: Estimation of impact zones for harbor porpoises and harbor seals  

Science Journals Connector (OSTI)

Underwater noise was recorded from three different types of wind turbines in Denmark and Sweden (Middelgrunden Vindeby and Bockstigen-Valar) during normal operation. Wind turbinenoise was only measurable above ambient noise at frequencies below 500 Hz. Total sound pressure level was in the range 109–127 dB re 1 ? ? Pa rms measured at distances between 14 and 20 m from the foundations. The 1/3-octave noise levels were compared with audiograms of harbor seals and harbor porpoises. Maximum 1/3-octave levels were in the range 106–126 dB re 1 ? ? Pa rms. Maximum range of audibility was estimated under two extreme assumptions on transmission loss (3 and 9 dB per doubling of distance respectively). Audibility was low for harbor porpoises extending 20–70 m from the foundation whereas audibility for harbor seals ranged from less than 100 m to several kilometers. Behavioral reactions of porpoises to the noise appear unlikely except if they are very close to the foundations. However behavioral reactions from seals cannot be excluded up to distances of a few hundred meters. It is unlikely that the noise reaches dangerous levels at any distance from the turbines and the noise is considered incapable of masking acoustic communication by seals and porpoises.

Jakob Tougaard; Oluf Damsgaard Henriksen; Lee A. Miller

2009-01-01T23:59:59.000Z

64

Ambient Air Quality Standards (Iowa)  

Energy.gov (U.S. Department of Energy (DOE))

These regulations set statewide ambient air quality standards for various contaminants. The state code follows the regulations set forth in the National Primary and Secondary Ambient Air Quality...

65

Background noise spectra of global seismic stations  

SciTech Connect

Over an extended period of time station noise spectra were collected from various sources for use in estimating the detection and location performance of global networks of seismic stations. As the database of noise spectra enlarged and duplicate entries became available, an effort was mounted to more carefully select station noise spectra while discarding others. This report discusses the methodology and criteria by which the noise spectra were selected. It also identifies and illustrates the station noise spectra which survived the selection process and which currently contribute to the modeling efforts. The resulting catalog of noise statistics not only benefits those who model network performance but also those who wish to select stations on the basis of their noise level as may occur in designing networks or in selecting seismological data for analysis on the basis of station noise level. In view of the various ways by which station noise were estimated by the different contributors, it is advisable that future efforts which predict network performance have available station noise data and spectral estimation methods which are compatible with the statistics underlying seismic noise. This appropriately requires (1) averaging noise over seasonal and/or diurnal cycles, (2) averaging noise over time intervals comparable to those employed by actual detectors, and (3) using logarithmic measures of the noise.

Wada, M.M.; Claassen, J.P.

1996-08-01T23:59:59.000Z

66

Prototype of a microwave generator with a high-temperature superconductor disk resonator in a feedback circuit with a low phase-noise level  

Science Journals Connector (OSTI)

Phase noise of a prototype of microwave generator with a disk resonator based on high-temperature superconductor (HTSC) Y1Ba2Cu3O7 ? ?...films in the feedback circuit has been measured for the first time. The dis...

A. E. Parafin; D. V. Masterov; S. A. Pavlov; M. A. Krevskii…

2013-12-01T23:59:59.000Z

67

Ambient temperature cadmium zinc telluride radiation detector and amplifier circuit  

DOE Patents (OSTI)

A low noise, low power consumption, compact, ambient temperature signal amplifier for a Cadmium Zinc Telluride (CZT) radiation detector. The amplifier can be used within a larger system (e.g., including a multi-channel analyzer) to allow isotopic analysis of radionuclides in the field. In one embodiment, the circuit stages of the low power, low noise amplifier are constructed using integrated circuit (IC) amplifiers , rather than discrete components, and include a very low noise, high gain, high bandwidth dual part preamplification stage, an amplification stage, and an filter stage. The low noise, low power consumption, compact, ambient temperature amplifier enables the CZT detector to achieve both the efficiency required to determine the presence of radio nuclides and the resolution necessary to perform isotopic analysis to perform nuclear material identification. The present low noise, low power, compact, ambient temperature amplifier enables a CZT detector to achieve resolution of less than 3% full width at half maximum at 122 keV for a Cobalt-57 isotope source. By using IC circuits and using only a single 12 volt supply and ground, the novel amplifier provides significant power savings and is well suited for prolonged portable in-field use and does not require heavy, bulky power supply components.

McQuaid, James H. (Livermore, CA); Lavietes, Anthony D. (Hayward, CA)

1998-05-29T23:59:59.000Z

68

Ambient temperature cadmium zinc telluride radiation detector and amplifier circuit  

DOE Patents (OSTI)

A low noise, low power consumption, compact, ambient temperature signal amplifier for a Cadmium Zinc Telluride (CZT) radiation detector is disclosed. The amplifier can be used within a larger system (e.g., including a multi-channel analyzer) to allow isotopic analysis of radionuclides in the field. In one embodiment, the circuit stages of the low power, low noise amplifier are constructed using integrated circuit (IC) amplifiers , rather than discrete components, and include a very low noise, high gain, high bandwidth dual part preamplification stage, an amplification stage, and an filter stage. The low noise, low power consumption, compact, ambient temperature amplifier enables the CZT detector to achieve both the efficiency required to determine the presence of radionuclides and the resolution necessary to perform isotopic analysis to perform nuclear material identification. The present low noise, low power, compact, ambient temperature amplifier enables a CZT detector to achieve resolution of less than 3% full width at half maximum at 122 keV for a Cobalt-57 isotope source. By using IC circuits and using only a single 12 volt supply and ground, the novel amplifier provides significant power savings and is well suited for prolonged portable in-field use and does not require heavy, bulky power supply components. 9 figs.

McQuaid, J.H.; Lavietes, A.D.

1998-05-26T23:59:59.000Z

69

Depth profiling ambient noise in the deep ocean  

E-Print Network (OSTI)

yaw of the platform itself. All the data recorded by the systemyaw of the platform. These data are useful in the diagnosis and correction of undesirable system

Barclay, David Readshaw

2011-01-01T23:59:59.000Z

70

Ambient noise Rayleigh wave tomography of New Zealand  

Science Journals Connector (OSTI)

......positions (Taupo green, Hamilton blue...s1 obtained in the current study (Fig. 14b...toward which the energy propagates. For...reveal that the high-energy west, south and...contrast, the low-energy north coast (between...during a short-term internship. This work was undertaken......

Fan-Chi Lin; Michael H. Ritzwoller; John Townend; Stephen Bannister; Martha K. Savage

2007-08-01T23:59:59.000Z

71

Asymmetric planar gradiometer for rejection of uniform ambient magnetic noise  

DOE Patents (OSTI)

An asymmetric planar gradiometer for use in making biomagnetic measurements. The gradiometer is formed from a magnetometer which is inductively-coupled to the smaller of two connected loops patterned in a superconducting film which form a flux transformer. The magnetometer is based on a SQUID formed from a high T.sub.c superconducting material. The flux transformer and magnetometer may be formed on separate substrates, allowing the baseline to be increased relative to presently available devices.

Dantsker, Eugene (Torrance, CA); Clarke, John (Berkeley, CA)

2000-01-01T23:59:59.000Z

72

Noise | Open Energy Information  

Open Energy Info (EERE)

Noise Jump to: navigation, search Retrieved from "http:en.openei.orgwindex.php?titleNoise&oldid647800" Category: NEPA Resources...

73

Size-dependent physiological responses of shore crabs to single and repeated playback of ship noise  

Science Journals Connector (OSTI)

...increase in response to ship-noise playback...predicted that the effect might be size-dependent...six (ambient and ship noise from each of...potential carry-over effects. In the repeated-exposure...and F Ladich. 2007 Effects of ship noise on the detectability...

2013-01-01T23:59:59.000Z

74

Combustion Noise  

E-Print Network (OSTI)

stabilize or destabilize the modes of the system, depending on the configuration of the combustor and the form of the coupling [26, 30]. In contrast to combustion instability, in broad-band combustion noise the unsteadiness in the rate of combustion... from th s in a mod on tempera , entropic a de of indir t frequenci r, open que sical theory assical expe s [14] who it by a spa d a transie le gases. A e bubble si idered as a flame was ent was o ng and dif depended udy it wa ion, ? ?,p r t? : (a...

Dowling, Ann P.; Mahmoudi, Yasser

2014-01-01T23:59:59.000Z

75

Ambiental PV | Open Energy Information  

Open Energy Info (EERE)

Ambiental PV Ambiental PV Jump to: navigation, search Name Ambiental PV Place Bahia, Brazil Zip 40140-380 Sector Carbon Product Bahia-based carbon consultancy firm. References Ambiental PV[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Ambiental PV is a company located in Bahia, Brazil . References ↑ "Ambiental PV" Retrieved from "http://en.openei.org/w/index.php?title=Ambiental_PV&oldid=342095" Categories: Clean Energy Organizations Companies Organizations Stubs What links here Related changes Special pages Printable version Permanent link Browse properties 429 Throttled (bot load) Error 429 Throttled (bot load) Throttled (bot load) Guru Meditation: XID: 186306960

76

A time history algorithm for aircraft noise  

Science Journals Connector (OSTI)

In the course of the development of a comprehensive computer airport noisemodel offering a choice of noise metrics (see previous paper) the ASDS metric (“Aircraft Sound Description System”) required the computation of the time noise levels from aircraft flyover exceed specified thresholds. A package of subroutines was developed that performs a noise level time history simulation by tracking aircraft position and orientation along a three?dimensional flight path using variable time steps depending on the rate of noise level change. The A?weighted noise levels at observer positions are calculated for each time step from two three?dimensional models: a three?component jet engine noise emission model (front fan rear fan jet) where each component varies with engine thrust at a different rate; and a propagation model describing the excess attenuation of A?weighted levels as a function of distance. Both models use aircraft specific empirical parameters determined from measured spectral data and calibrated by comparing calculated and measured maximum A?weighted flyover levels for a range of practical distances. The subroutine package is capable of calculating threshold exceedance times cumulative distributions of noise levels and the time?integrated energy equivalent noise level from an aircraft flyover. [Work supported by the U. S. Department of Transportation.

R. Rackl

1977-01-01T23:59:59.000Z

77

Chapter 9 Audible Noise  

NLE Websites -- All DOE Office Websites (Extended Search)

noise limits or defer to the states or the federal government for noise limits. BPA has established a transmission line design criterion for corona-generated noise (L 50...

78

Fundamentals of Electronic Noise  

Science Journals Connector (OSTI)

At first the physical sources of the most important types of noise within a receiver—thermal and shot noise—as well as the antenna noise are discussed and their power spectral densities are given.

Professor Dr.-Ing. Karl-Heinz Löcherer…

1982-01-01T23:59:59.000Z

79

Noise Control of a Flare Stack  

Science Journals Connector (OSTI)

As part of its noise abatement program the Standard Oil Company of California has undertaken to reduce the noise radiated from the flare stacks serving the new process plants at the El Segundo Refinery. These flares used to burn excess refinery hydrocarbon gases have to operate smokelessly. To accomplish this high?pressure steam jets are used to discharge a turbulent steam?air mixture into the combustion zone. This system although muffled proved to be an intolerable source of noise in the adjacent community. An examination of the noise spectrum indicated that the mixing between the steam ejected from the 3 4 ? in. ? diam primary nozzle and the ambient air was a major source of noise. A series of exploratory model scale tests were conducted in an effort to reduce the noise. By replacing a single 3 4 ? in. ?diam nozzle with a multiple nozzle the radiated noise was reduced by 16 dB. The multiple nozzle configuration and the experimental program leading to its design are described.

A. S. Hersh; J. G. Seebold

1970-01-01T23:59:59.000Z

80

Noise impact assessment by utilizing noise map and GIS: A case study in the city of Chungju, Republic of Korea  

Science Journals Connector (OSTI)

In this study, a scheme to develop a noise map and noise impact assessment method using GIS has been suggested. After developing a road-traffic noise map for the city of Chungju, Republic of Korea, noise impact assessment was performed through analyzing the map. A 3-dimensional terrain model was generated using digital maps and building models were prepared using the information from draft and digital maps. To develop a noise evaluation model, a noise-source map for each road was generated. The noise levels at 25 locations close to roads were measured and compared with the expected noise levels to verify the developed noise map. An excess noise map was generated by comparing the road-traffic noise map with a noise-standard map. Using the excess noise map, the areas exceeding environmental noise standards were effectively evaluated through a GIS space analysis. The 3-dimensional facade noise map was generated to calculate the number of people exposed to a certain noise level.

Joon Hee Ko; Seo Il Chang; Byung Chan Lee

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

ORIGINAL ARTICLE Ambient Air Pollution  

E-Print Network (OSTI)

supporting an association between am- bient air pollution and cardiovascular health, much re- mains health effects of ambient air pollution in Atlanta being undertaken by this Emory investi- gative teamORIGINAL ARTICLE Ambient Air Pollution and Cardiovascular Emergency Department Visits Kristi Busico

Mulholland, James A.

82

Study of Collective Interaction Control over e-beam Current Noise  

NLE Websites -- All DOE Office Websites (Extended Search)

noise below the text- book shot-noise level (eI b )? *Is it possible to enhance the coherence of X-UV FELs by suppressing the input noise? *What are the fundamental limits of FEL...

83

Noise of cleanroom recirculation systems  

Science Journals Connector (OSTI)

Recirculation air systems are used by the microelectronics industry as the primary source of unidirectional air flow in cleanrooms. The commonly used recirculation systems include: (1) packaged air handlers which include centrifugal or plug (plenum) fans generally located at fan deck level above the cleanroom; (2) fan?tower recirculation systems consisting most often of vertically mounted vaneaxial fans arranged along the cleanroom perimeter; (3) individual fan?filter units in which the HEPA or ULPA filters are combined with small direct drive blowers supported by the ceiling suspension system; and (4) minienvironments which create superclean conditions around individual tools within a less clean ‘‘ballroom.’’ In this paper the commonly used recirculation systems will be described typical sound power levels and spectrum characteristics of the systems will be presented the natural noise attenuation along the air flow paths will be listed the theoretical models for predicting noise levels in a cleanroom will be introduced and noise mitigation means which can be integrated into different systems will be discussed. Also presented will be the typical noise levels measured in operating cleanrooms.

Mei Q. Wu; Colin G. Gordon

1998-01-01T23:59:59.000Z

84

Object detectability at increased ambient lighting conditions  

SciTech Connect

Under typical dark conditions encountered in diagnostic reading rooms, a reader's pupils will contract and dilate as the visual focus intermittently shifts between the high luminance display and the darker background wall, resulting in increased visual fatigue and the degradation of diagnostic performance. A controlled increase of ambient lighting may, however, reduce the severity of these pupillary adjustments by minimizing the difference between the luminance level to which the eyes adapt while viewing an image (L{sub adp}) and the luminance level of diffusely reflected light from the area surrounding the display (L{sub s}). Although ambient lighting in reading rooms has conventionally been kept at a minimum to maintain the perceived contrast of film images, proper Digital Imaging and Communications in Medicine (DICOM) calibration of modern medical-grade liquid crystal displays can compensate for minor lighting increases with very little loss of image contrast. This paper describes two psychophysical studies developed to evaluate and refine optimum reading room ambient lighting conditions through the use of observational tasks intended to simulate real clinical practices. The first study utilized the biologic contrast response of the human visual system to determine a range of representative L{sub adp} values for typical medical images. Readers identified low contrast horizontal objects in circular foregrounds of uniform luminance (5, 12, 20, and 30 cd/m{sup 2}) embedded within digitized mammograms. The second study examined the effect of increased ambient lighting on the detection of subtle objects embedded in circular foregrounds of uniform luminance (5, 12, and 35 cd/m{sup 2}) centered within a constant background of 12 cd/m{sup 2} luminance. The images were displayed under a dark room condition (1 lux) and an increased ambient lighting level (50 lux) such that the luminance level of the diffusely reflected light from the background wall was approximately equal to the image L{sub adp} value of 12 cd/m{sup 2}. Results from the first study demonstrated that observer true positive and false positive detection rates and true positive detection times were considerably better while viewing foregrounds at 12 and 20 cd/m{sup 2} than at the other foreground luminance levels. Results from the second study revealed that under increased room illuminance, the average true positive detection rate improved a statistically significant amount from 39.3% to 55.6% at 5 cd/m{sup 2} foreground luminance. Additionally, the true positive rate increased from 46.4% to 56.6% at 35 cd/m{sup 2} foreground luminance, and decreased slightly from 90.2% to 87.5% at 12 cd/m{sup 2} foreground luminance. False positive rates at all foreground luminance levels remained approximately constant with increased ambient lighting. Furthermore, under increased room illuminance, true positive detection times declined at every foreground luminance level, with the most considerable decrease (approximately 500 ms) at the 5 cd/m{sup 2} foreground luminance. The first study suggests that L{sub adp} of typical mammograms lies between 12 and 20 cd/m{sup 2}, leading to an optimum reading room illuminance of approximately 50-80 lux. Findings from the second study provide psychophysical evidence that ambient lighting may be increased to a level within this range, potentially improving radiologist comfort, without deleterious effects on diagnostic performance.

Pollard, Benjamin J.; Chawla, Amarpreet S.; Delong, David M.; Hashimoto, Noriyuki; Samei, Ehsan [Duke Advanced Imaging Laboratories, Department of Radiology, Medical Physics Graduate Program, Duke University, Durham, North Carolina 27705 (United States); Duke Advanced Imaging Laboratories, Departments of Radiology and Biomedical Engineering, Duke University, Durham, North Carolina 27705 (United States); Duke Advanced Imaging Laboratories, Department of Biostatistics and Bioinformatics, Duke University, Durham, North Carolina 27705 (United States); Eizo Nanao Technologies, Inc., Cypress, California 90630 (United States); Duke Advanced Imaging Laboratories, Departments of Radiology, Physics, and Biomedical Engineering, Medical Physics Graduate Program, Duke University Durham, North Carolina 27705 (United States)

2008-06-15T23:59:59.000Z

85

New and Underutilized Technology: Low Ambient/Task Lighting | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Low Ambient/Task Lighting Low Ambient/Task Lighting New and Underutilized Technology: Low Ambient/Task Lighting October 4, 2013 - 4:51pm Addthis The following information outlines key deployment considerations for low ambient/task lighting within the Federal sector. Benefits The low ambient/task lighting strategy improves the visual environment by adding controllable task fixtures that provide light directly where needed for a given task, while reducing the overhead (ambient) light level. Occupancy sensors can also be incorporated into the system. Application Low ambient/task lighting is applicable in most building categories. Key Factors for Deployment Low ambient/task lighting is suitable for most office spaces, including both cubicle and private office space environments, and should be

86

Noise exposures in US coal mines  

SciTech Connect

Mine Safety and Health Administration (MSHA) inspectors conduct full-shift environmental noise surveys to determine the occupational noise levels to which coal miners are exposed. These noise surveys are performed to determine compliance with the noise standard promulgated under the Federal Mine Safety and Health Act of 1977. Data from over 60,000 full-shift noise surveys conducted from fiscal year 1986 through 1992 were entered into a computer data base to facilitate analysis. This paper presents the mean and standard deviation of over 60,000 full-shift noise dose measurements for various underground and surface coal mining occupations. Additionally, it compares and contrasts the levels with historical noise exposure measurements for selected coal mining occupations that were published in the 1970`s. The findings were that the percentage of miners surveyed that were subjected to noise exposures above 100%, neglecting personal hearing protectors, were 26.5% and 21.6% for surface and underground mining, respectively. Generally, the trend is that the noise exposures for selected occupations have decreased since the 1970`s.

Seiler, J.P.; Valoski, M.P.; Crivaro, M.A.

1994-05-01T23:59:59.000Z

87

Computation of structural flexibility for bridge health monitoring using ambient modal data  

SciTech Connect

Issues surrounding the use of ambient vibration modes for the location of structural damage via dynamically measured flexibility are examined. Several methods for obtaining the required mass- normalized dynamic mode shapes from ambient modal data are implemented and compared. The method are applied to data from a series of ambient modal tests on an actual highway bridge. Results indicate that for the damage case examined, the flexibility from the ambient mode shapes gave a better indication of damage than the flexibility from the forced-vibration mode shapes. This improved performance is attributed to the higher excitation load levels that occur during the ambient test.

Doebling, S.W.; Farrar, C.R.

1996-05-01T23:59:59.000Z

88

Steam Turbine Control Valve Noise  

Science Journals Connector (OSTI)

Although noise problems with steam turbine control valves have existed before they have become more prominent with nuclear turbines whose valves range to 20 in. in diameter. Our first?generation nuclear control valves were unacceptably noisy when operating under chocked conditions. These noise levels have been ameliorated by incorporation of a valve cage with numerous small holes. Rational design rules for this “dispersive muffler” have been developed from published multiple?jet noise data and improved through our own tests. However we are also evaluating other low?noise valve configurations which are consistent with turbine requirements. The approach we are developing is to investigate the internal aerodynamic noisegeneration in small air model tests and to combine this with measurements of pipe?wall transmission characteristics (being reported separately) to predict externally radiated noise. These predictions will be checked in a new steam test facility for complete scale?model valves. The small air tests show that acoustic efficiencies of throttling valve flows tend to vary with third power of Mach number when exhausting into space and with a lesser power when enclosed in a downstream pipe. At some pressure ratios narrow?band spikes appear in the spectrum and for some configurations step changes in sound power are associated with transitions in flow regimes.

Frank J. Heymann; Michael A. Staiano

1973-01-01T23:59:59.000Z

89

Computational Modeling of Propeller Noise: NASA SR-7A propeller.  

E-Print Network (OSTI)

??The aerospace industry has been concerned with propeller noise levels for years. This interest is two-fold: government regulation and comfort in cabin. This report attempts… (more)

Moussa, Karim

2014-01-01T23:59:59.000Z

90

Noise and Vibration Control of Combustion Engine Vehicles.  

E-Print Network (OSTI)

??Noise and vibrations have over the last two decades been regarded as significant environmental health problems. Regulations regarding acoustic as well as vibration levels have… (more)

Winberg, Mathias

2005-01-01T23:59:59.000Z

91

Characterization of vehicle noise in Hong Kong  

Science Journals Connector (OSTI)

There is a common perception among residents of high?rise buildings facing expressways that noise emitted from moving vehicles would be dominated by tire/road interaction and at high?frequency regions. Local government officials believe that the impact on residents of low?frequency noise radiated from car engines would be insignificant especially after the corrections for the A?weighting scale are applied. This paper reports on an extensive survey and some in situ sound measurements. It was found that road noise in Hong Kong is dominated by low?frequency noise emitted from heavy vehicles in expressways and by low?frequency noise emitted from heavy and light vehicles driven at a speed below 50 km/h in streets. The measured data were characterized by using time?averaged 1/1 octave band analysis time?averaged 1/3 octave band analysis and time?frequency analysis. The Doppler effect was clearly observed at low?frequency regions in joint time?frequency distributions. It is suggested that the A?weighting scale would not reflect the true annoyance level of traffic noise. Noisiness should be used to quantify the annoyance caused by moving vehicles. A new noise model is proposed to give a realistic description of noise radiated from a moving vehicle.

W. T. Ng; M. M. F. Yuen; W. M. To

1998-01-01T23:59:59.000Z

92

Wind farm noise  

Science Journals Connector (OSTI)

Arrays of small wind turbines recently coined as “wind farms” offer several advantages over single larger wind turbines producing the same electrical power. Noise source characteristics of wind farms are also different from those associated with a single wind turbine. One?third octave band noise measurements from 2 Hz to 10 kHz have been made and will be compared to measurements of noise produced by a single large wind turbine. [J. R. Balombin Technical Memorandum 81486.

Gregory C. Tocci; Brion G. Koning

1981-01-01T23:59:59.000Z

93

Environmental noise impact of modern wind farms  

Science Journals Connector (OSTI)

Electric power production from wind turbines has increased substantially during the past few years due to the growing emphasis on renewable energy sources and more efficient wind turbine technology. Although modern turbines are significantly quieter than early models wind farms that are proposed near residential areas generate concern about potential noise issues. The present study consists of two parts: (1) the measurement of sound levels within a 2?km radius of the existing Nine Canyons wind farm near Richland WA and (2) the application of an outdoor sound propagation model to predict noise levels both at Nine Canyons and in the vicinity of a proposed farm near Ellensburg WA. At most locations within the Nine Canyon site recorded sound levels were less than predicted levels with the exception of some downwind sites that were lower in elevation than the source. Noise levels were greatest downwind from the turbines but never exceeded 50 dBA beyond 500 m from the nearest turbine. In many cases wind noise at the microphone exceeded noise levels from the turbines.

2004-01-01T23:59:59.000Z

94

Noise & Vibration Ctrl What's noise and what's vibration?  

E-Print Network (OSTI)

Institut für Technische Akustik Noise & Vibration Ctrl · What's noise and what's vibration? ­ Noise = unwanted sound ­ Vibration = oscillations of structures © Prof. B.A.T. Petersson #12;Institut für Technische Akustik Noise & Vibration Ctrl. · What's Noise & Vibration Control? Genera t ion Transmiss ion

Berlin,Technische Universität

95

Ambient pressure fuel cell system  

DOE Patents (OSTI)

An ambient pressure fuel cell system is provided with a fuel cell stack formed from a plurality of fuel cells having membrane/electrode assemblies (MEAs) that are hydrated with liquid water and bipolar plates with anode and cathode sides for distributing hydrogen fuel gas and water to a first side of each one of the MEAs and air with reactant oxygen gas to a second side of each one of the MEAs. A pump supplies liquid water to the fuel cells. A recirculating system may be used to return unused hydrogen fuel gas to the stack. A near-ambient pressure blower blows air through the fuel cell stack in excess of reaction stoichiometric amounts to react with the hydrogen fuel gas.

Wilson, Mahlon S. (Los Alamos, NM)

2000-01-01T23:59:59.000Z

96

Modal parameter extraction from large operating structures using ambient excitation  

SciTech Connect

A technique called the Natural Excitation Technique or has been developed to response extract response parameters from large operational structure when subjected to random and unmeasured forces such as wind, road noise, aerodynamics, or waves. Six applications of NExT to ambient excitation testing and NExT analysis are surveyed in this paper with a minimum of technical detail. In the first application, NExT was applied to a controlled-yaw Horizontal-Axis Wind Turbine (HAWT). By controlling the yaw degree of freedom an important class of rotating coordinate system effects are reduced. A new shape extraction procedure was applied to this data set with good results. The second application was to a free-yaw HAWT. The complexity of the response has prompted further analytical studies and the development of a specialized visualization package. The third application of NExT was to a parked three-bladed Vertical-Axis Wind Turbine (VAWT) in which traditional modal testing could not excite all modes of interest. The shape extraction process used cross-correlation functions directly in a time-domain shape-fitting routine. The fourth application was to ground transportation systems. Ongoing work to improve driver and passenger comfort in tractor-trailer vehicles and to refine automobile body and tire models will use NExT. NExT has been used to process ambient vibration data for Finite Element Model correlation and is being used to study Structural Health Monitoring with ambient excitation. Shape fitting was performed using amplitude and phase information taken directly from the cross-spectra. The final application is to an offshore structure. This work is on-going, however initial studies have found a high-modal density, high noise content, and sparse data set.

James, G.H. III; Carne, T.G.; Mayes, R.L.

1995-12-31T23:59:59.000Z

97

Hazard of intermittent noise exposures  

Science Journals Connector (OSTI)

The chief shortcoming of the “equal energy” hypothesis—the notion that equal products of time and intensity provide equal hazard—is that the recuperative powers of the auditory system are essentially ignored. A single sustained stimulus is regarded as no more dangerous than an intermittent one of the same total energy. A two?year study of the effect of intermittency on the TTS produced in normal young adults by 6? or 8?h exposures to octave bands of noise whose center frequencies ranged from 250 to 4000 Hz indicates that even for the most hazardous noise (the 4000?Hz OB) cutting the cumulative exposure time in half by interjecting regular quiet periods will permit an increase in level of 5 dB for constant TTS at least up to about 100 dB SPL. At 1000 Hz the trading relation is 6–7 dB for halving time and at 250 Hz is even greater. Thus the 5?dBA?per?halving?time relation employed by the present OSHA standard is essentially correct for intermittent noise except perhaps above 100 to 105 dBA where the equal?energy hypothesis may be more appropriate for spectra with high?frequency dominance. A single 5?dBA “correction for intermittency” is an oversimplification. [Research supported by the National Institute for Occupational Safety and Health Public Health Service.

W. D. Ward

1974-01-01T23:59:59.000Z

98

Amplitude modulation of wind turbine noise  

E-Print Network (OSTI)

Due to swish and thump amplitude modulation, the noise of wind turbines cause more annoyance than other environmental noise of the same average level. The wind shear accounts for the thump modulation (van den Berg effect). Making use of the wind speed measurements at the hub height, as well as at the top and the bottom of the rotor disc (Fig.1), the non-standard wind profile is applied. It causes variations in the A-weighted sound pressure level, LpA. The difference between the maximum and minimum of LpA characterizes thump modulation (Fig.2).

Makarewicz, Rufin

2013-01-01T23:59:59.000Z

99

Flow Noise Prediction and Control in Steam Piping Systems for Nuclear Power Plants  

Science Journals Connector (OSTI)

The flow noise of steam in pipe lines particularly in power plants is a major noise source and contributor to OSHA noise problems. The ability to predict flow noise levels is vital to efficient and economical noise control. Octave?band measurements of flow noise in the main steam piping system of a nuclear power plant were made. To determine the effect of velocity measurements were conducted for a wide range of velocities during plant start?up. Results in the form of plots of measured flow noise as a function of velocity were compared with limited data that have been recently published. An empirical formula for prediction of flow noise and corresponding design techniques for control of noise by proper pipe sizing have been developed. Alternate methods of noise control are reviewed.

F. H. Brittain; S. W. Giampapa

1973-01-01T23:59:59.000Z

100

Noise and Bandwidth Performance of Single-Molecule Biosensors  

E-Print Network (OSTI)

Noise and Bandwidth Performance of Single-Molecule Biosensors J. Rosenstein, S. Sorgenfrei, K. L and nanotube field-effect transistors offer different tradeoffs between bandwidth and noise levels. Here, we on force spectroscopy, such as optical tweezers [4] and atomic force microscopy [5]. New electrochemical

Shepard, Kenneth

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Shot Noise in Graphene  

Science Journals Connector (OSTI)

We report measurements of current noise in single-layer and multilayer graphene devices. In four single-layer devices, including a p-n junction, the Fano factor remains constant to within ±10% upon varying carrier type and density, and averages between 0.35 and 0.38. The Fano factor in a multilayer device is found to decrease from a maximal value of 0.33 at the charge-neutrality point to 0.25 at high carrier density. These results are compared to theories for shot noise in ballistic and disordered graphene.

L. DiCarlo; J. R. Williams; Yiming Zhang; D. T. McClure; C. M. Marcus

2008-04-14T23:59:59.000Z

102

Geothermal Noise Control  

Science Journals Connector (OSTI)

In these times of growing need for new energy sources geothermal has shown great promise. Geothermal is a green relatively nonpolluting energy source that can provide power on a scale large enough to make a significant contribution to our needs. One of the challenges of geothermal development is noise emission. This occurs after a well encounters steam and before a plant is constructed. It also arises from the necessity of shutting down a power plant for periodic maintenance. While the power plant is down the steam and noise is vented to the atmosphere.

Marshall Long

2009-01-01T23:59:59.000Z

103

Characterization of classroom noise and noise control techniques and their effect on speech comprehension while learning.  

Science Journals Connector (OSTI)

Classrooms have been shown to be prone to elevated occupied noise levels that reduce speech comprehension and inhibit learning. This presentation discusses a current study that includes three parts: (1) the characterization of masking invoked by noise commonly found in today’s classrooms (2) the formulation of a metric that intends to associate masking risk to noise features and (3) the attempt to quantify any increase in speech comprehension resulting from interior acoustic designs that aspire to reduce noise in occupied classrooms. Calibrated recordings made during classroom activities in 9 schools are post processed to allow noisecharacteristics to be rated based on attributes related to the noise source or type duration rate of recurrence spectra level envelope and peak energy. Binaural and monaural recordings are compared. Speech to noise ratios are statistically weighted over various time frames and activities in an attempt to refine reproducibility among different activities. All recordings were made in occupied rooms both before and after the various treatments were integrated. The results suggest that there are misconceptions in the literature in terms of today’s classroom design trends and a few novel principles emerged as being highly effective.

Sooch SanSouci; Line Guerra; Dick Campbell

2010-01-01T23:59:59.000Z

104

Electronic Noise Calibrator for the Small Radio Telescope RODOLFO MONTEZ JR.  

E-Print Network (OSTI)

reveal a #12;stable region from 5­10mA. The operating current should lie within this region. Our power an ambient- temperature vane calibrator to obtain a measure of the system noise, background sky, atmosphere Procedures and Projects chapter of The ARRL Handbook for Radio Amateurs for calibrating ham radios. The two

Seager, Sara

105

Noise Estimate of Pendular Fabry-Perot through Reflectivity Change  

E-Print Network (OSTI)

A key issue in developing pendular Fabry-Perot interferometers as very accurate displacement measurement devices, is the noise level. The Fabry-Perot pendulums are the most promising device to detect gravitational waves, and therefore the background and the internal noise should be accurately measured and reduced. In fact terminal masses generates additional internal noise mainly due to thermal fluctuations and vibrations. We propose to exploit the reflectivity change, that occurs in some special points, to monitor the pendulums free oscillations and possibly estimate the noise level. We find that in spite of long transients, it is an effective method for noise estimate. We also prove that to only retain the sequence of escapes, rather than the whole time dependent dynamics, entails the main characteristics of the phenomenon. Escape times could also be relevant for future gravitational wave detector developments.

Addesso, Paolo; Filatrella, Giovanni

2014-01-01T23:59:59.000Z

106

SPDA-Actualidad Ambiental | Open Energy Information  

Open Energy Info (EERE)

SPDA-Actualidad Ambiental SPDA-Actualidad Ambiental Jump to: navigation, search Name SPDA-Actualidad Ambiental Agency/Company /Organization Peruvian Society for Environmental Law (SPDA) Sector Energy, Land, Water, Climate Resource Type Video, Publications, Training materials, Lessons learned/best practices Website http://www.actualidadambiental UN Region Caribbean, Central America, South America References SPDA-Actualidad Ambiental[1] SPDA-Actualidad Ambiental Screenshot "SPDA current environmental journalism is a service of the Peruvian Society for Environmental Law (SPDA) , which seeks to inform about the latest news and events related to the environment in Peru and the world in search of greater awareness and action for preservation of our planet. On this site you can also obtain and use for free videos, high resolution photos and the

107

Road traffic noise mapping in Guangzhou using GIS and GPS  

Science Journals Connector (OSTI)

Abstract The primary objective of this study is to develop day and night road traffic noise maps for Guangzhou using Geographical Information Systems (GIS) and Global Positioning Systems (GPS). First, as speed-density relation is used to estimate the traffic volume from GPS data collected from floating cars. Meanwhile, the attributes of the roads and buildings are automatically exported from GIS. Second, a single vehicle noise emission model is combined with a noise propagation model to formulate a regional traffic noise calculation model that accounts for the traffic noise attenuation in an urban area. The algorithm is optimized by intelligently dividing the computational grids, filtering the traffic noise sources automatically and performing a quick index of the estimation objects. Finally, the day and night road traffic noise levels in Guangzhou are estimated to create two traffic noise maps. The accuracy of the developed algorithm is validated by conducting a traffic noise monitoring experiment in several districts of Guangzhou with different road types. The results show that the average error between the estimated and measured values is below 2.0 dB.

Ming Cai; Jingfang Zou; Jiemin Xie; Xialin Ma

2015-01-01T23:59:59.000Z

108

Issues in heat recovery steam generator system noise  

Science Journals Connector (OSTI)

A heat recovery steam generator (HRSG) is a fundamental component of all combustion turbine?based combined cycle power plants. While it’s primary purpose is to convert exhaust gas heat to steam an important secondary function is to reduce noise emissions from the combustion turbine exhaust. This source at about 155 dB (overall) re: 1 pW for a 100?MW turbine is the highest noise emission source in any combustion turbine plant. Therefore the residual exhaust noise emissions leaving the HRSG walls and stack exit must be predicted with acceptable accuracy to determine the total plant noise level. The sources involved in this prediction methodology will be discussed. The issues include source power levels wall and duct transmission loss and the noise reduction characteristics through the HRSG flow path. Special measurement techniques required to quantify HRSG noise emissions are described. Whereas the HRSG is mainly a passive device that attenuates combustion turbine exhaust noise two HRSG generated sources steam venting and supplemental duct firing will also be discussed. [See NOISE?CON Proceedings for full paper.

George F. Hessler Jr.

1997-01-01T23:59:59.000Z

109

A simulation model for urban traffic noise  

Science Journals Connector (OSTI)

Urban traffic noise is studied by a simulation model whose main features are the following: effects of traffic lights speed limit possibility of vehicles overtaking and driving styles. In the model there is a basic assumption about driver’s behavior (‘‘follow the leader’’) considering the case of straight and level road with two lanes for every carriageway and two traffic lights. Three driving styles are considered: A (‘‘quiet driver’’): change of gear at 60% of engine speed corresponding to maximum torque B (‘‘normal driver’’): at 80% C (‘‘fast driver’’): at 100%. The behavior rules provide for: keeping of safety distance overtaking if there are vehicles at different speeds deceleration and stop at traffic lights with red synchronization of two traffic lights if requested. From the kinematic side the model was validated by comparison with acceleration distribution of a real vehicle’s flow while the acoustic one was by the comparison with noise levels measured along urban streets. The simulation model lets one take into account the following factors concerning the traffic noise emission: main noise sources of vehicle (tires engine intake and exhaust system) traffic flow and maximum speed allowed traffic mix as regards different driving styles.

A. Di Giulio; F. Mancosu; C. Nucci; L. Zocchi

1999-01-01T23:59:59.000Z

110

Noise and Hearing Conservation  

NLE Websites -- All DOE Office Websites (Extended Search)

Hearing Conservation Hearing Conservation Mary L. Doyle NOISE & HEARING CONSERVATION Mary L. Doyle, MPH, RN, COHN-S/CM DOE Headquarters January 16, 2002 1.0.1.~ CAUSES OF HEARING LOSS * Congenital * Environmental Exposures * Hereditary * Illness *Injury * Noise * Occupational * Non-Occupational * Sociacusis S.O.S. eon.ua.nt. OTOTOXIC DRUGS Can Affect Cochlea or Vestibular System * Aminoglycoside Antibiotics * Diuretics * Cancer Chemotherapy * Aspirin * Quinines * Usually Permanent * Consider Benefit-Risk Ratio S.O.S. eon.ua.nts HEARING * Modification of Acoustic Wave by Outer Ear * Conversion of Modified Acoustic Wave to Vibration of Eardrum * Middle Ear * Inner Ear * Transformation of Mechanical Movement to Nerve Impulses S.O.S. CoMubRis OTOTOXIC INDUSTRIAL

111

An experimental study of low-frequency amplitude noise in a fibre Bragg grating laser diode  

SciTech Connect

We have studied the amplitude noise in a fibre Bragg grating laser diode. It has been shown that discontinuities in noise characteristics correlate with those in the power – current and spectral characteristics of the laser diode, whereas the noise characteristics of the pump source have no such discontinuities. The highest noise level has been observed at pump currents corresponding to concurrent generation of two longitudinal modes. (lasers)

Zholnerov, V S [Russian Institute of Radionavigation and Time, St.Petersburg (Russian Federation); Ivanov, A V; Kurnosov, V D; Kurnosov, K V; Romantsevich, V I; Chernov, R V [Open Joint-Stock Company M.F. Stel'makh Polyus Research Institute, Moscow (Russian Federation)

2013-09-30T23:59:59.000Z

112

The Influence of Increased Ambient Lighting on Mass Detection in Mammograms  

Science Journals Connector (OSTI)

Rationale and Objectives Recent research has provided evidence that in reading rooms equipped with liquid crystal displays (LCDs), a measured increase of ambient lighting may improve clinicians' detection performance. In agreement with this research, the American College of Radiology (ACR) has recommended a moderate increase of ambient lighting in mammography reading rooms. This study was designed to examine the effect of a controlled increase of ambient lighting in mammography reading rooms on the diagnostic performance of breast imaging radiologists. Materials and Methods Four breast imaging radiologists read 86 mammograms (43 containing subtle cancerous masses and 43 normal) under low (E = 1 lux) and elevated (E = 50 lux) ambient lighting levels on a Digital Imaging and Communications in Medicine–calibrated, medical-grade LCD. Radiologists were asked to identify cancerous masses and to rate their detection confidence. Observer areas under the curve (AUCs) were calculated using a receiver-operating characteristic analysis of fully paired results. Additionally, average observer selection times under both ambient lighting levels were determined. Results Average radiologist \\{AUCs\\} decreased with elevated ambient lighting (0.78 ± 0.03 to 0.72 ± 0.04). Observer performance differences, however, were of the same order of magnitude as interobserver variability and were not statistically significant. Average selection times under increased ambient lighting remained constant or decreased, with the greatest decrease occurring for false-positive (20.4 ± 18.9 to 14.4 ± 9.6 seconds) and true-positive (18.0 ± 13.8 to 12.9 ± 9.4 seconds) selections. Conclusion The results agree with those of previous studies in that observer performance differences under a controlled increase of ambient lighting are not statistically significant. On the basis of these findings and ACR guidelines, a moderate increase of ambient lighting in mammography reading rooms is still suggested, but further research with additional cases and observers should be considered.

Benjamin J. Pollard; Ehsan Samei; Amarpreet S. Chawla; Jay Baker; Sujata Ghate; Connie Kim; Mary S. Soo; Noriyuki Hashimoto

2009-01-01T23:59:59.000Z

113

Genetic noise control via protein oligomerization  

SciTech Connect

Gene expression in a cell entails random reaction events occurring over disparate time scales. Thus, molecular noise that often results in phenotypic and population-dynamic consequences sets a fundamental limit to biochemical signaling. While there have been numerous studies correlating the architecture of cellular reaction networks with noise tolerance, only a limited effort has been made to understand the dynamical role of protein-protein associations. We have developed a fully stochastic model for the positive feedback control of a single gene, as well as a pair of genes (toggle switch), integrating quantitative results from previous in vivo and in vitro studies. In particular, we explicitly account for the fast protein binding-unbinding kinetics, RNA polymerases, and the promoter/operator sequences of DNA. We find that the overall noise-level is reduced and the frequency content of the noise is dramatically shifted to the physiologically irrelevant high-frequency regime in the presence of protein dimerization. This is independent of the choice of monomer or dimer as transcription factor and persists throughout the multiple model topologies considered. For the toggle switch, we additionally find that the presence of a protein dimer, either homodimer or heterodimer, may significantly reduce its intrinsic switching rate. Hence, the dimer promotes the robust function of bistable switches by preventing the uninduced (induced) state from randomly being induced (uninduced). The specific binding between regulatory proteins provides a buffer that may prevent the propagation of fluctuations in genetic activity. The capacity of the buffer is a non-monotonic function of association-dissociation rates. Since the protein oligomerization per se does not require extra protein components to be expressed, it provides a basis for the rapid control of intrinsic or extrinsic noise. The stabilization of phenotypically important toggle switches, and nested positive feedback loops in general, is of direct implications to organism fitness. Finally, noise control through oligomerization suggests avenues for the design of robust synthetic gene circuits for engineering purposes.

Ghim, C; Almaas, E

2008-06-12T23:59:59.000Z

114

Capture of carbon dioxide from ambient air  

Science Journals Connector (OSTI)

Carbon dioxide capture from ambient air could compensate for all carbon dioxide emissions to the atmosphere. Such capture would, for example, make it possible to use liquid, carbon-based fuels in cars or airplane...

K.S. Lackner

2009-09-01T23:59:59.000Z

115

Scenario-Based design of ambient intelligence  

Science Journals Connector (OSTI)

In this paper scenario-based design approach for development of Ambient Intelligence (AmI) is described. Design of any concept is based on communication between different stakeholders. Furthermore design of these concepts should be grounded heavily to ...

Veikko Ikonen; Marketta Niemelä; Eija Kaasinen

2006-10-01T23:59:59.000Z

116

Safeguards in a World of Ambient Intelligence  

Science Journals Connector (OSTI)

Ambient Intelligence is a vision of the future information society stemming from the convergence of ubiquitous computing, ubiquitous communication and intelligent user-friendly interfaces. Beyond the possible ben...

Michael Friedewald

2005-01-01T23:59:59.000Z

117

MAS.963 Ambient Intelligence, Spring 2004  

E-Print Network (OSTI)

This course focuses on Ambient Intelligence, and how it envisions a world where people are surrounded by intelligent and intuitive interfaces embedded in the everyday objects around them. These interfaces recognize and ...

Maes, Patricia

118

Gua para a Sustentabilidade Ambiental na UDC  

E-Print Network (OSTI)

#12;#12;#12;Guía para a Sustentabilidade Ambiental na UDC #12;Redacción Dolores Árias Vázquez Juan Introdución 23 Indicadores de sustentabilidade 27 O contorno natural e humanizado 35 Caracterización dos Ambientalización curricular 101 Outros servizos da udC relacionados coa sustentabilidade 105 O medio ambiente

Fraguela, Basilio B.

119

The Magnetic Noise of a DC Electric Motor — Modeling of Three-Times-Coupled Electromagnetic, Mechanical and Acoustic Phenomena  

Science Journals Connector (OSTI)

The sound power level of the magnetic noise radiated from a DC electric motor was numerically estimated for different loading conditions and two motor designs. Since the mechanism of the magnetic noise generation...

M. Furlan; M. Boltežar

2005-01-01T23:59:59.000Z

120

Nuclear-spin noise  

Science Journals Connector (OSTI)

The spectral density of the Nyquist noise current in a tuned circuit coupled to a sample of nuclear spins has been measured at He4 temperatures with a dc SQUID used as a rf amplifier. When the sample is in thermal equilibrium, a dip is observed in the spectral density at the Larmor frequency. For zero spin polarization, on the other hand, a bump in the spectral density is observed. This bump is due to temperature-independent fluctuations in the transverse component of magnetization, and represents spontaneous emission from the spins into the circuit.

Tycho Sleator; Erwin L. Hahn; Claude Hilbert; John Clarke

1985-10-21T23:59:59.000Z

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Liquid level detector  

DOE Patents (OSTI)

A liquid level detector for low pressure boilers. A boiler tank, from which apor, such as steam, normally exits via a main vent, is provided with a vertical side tube connected to the tank at the desired low liquid level. When the liquid level falls to the level of the side tube vapor escapes therethrough causing heating of a temperature sensitive device located in the side tube, which, for example, may activate a liquid supply means for adding liquid to the boiler tank. High liquid level in the boiler tank blocks entry of vapor into the side tube, allowing the temperature sensitive device to cool, for example, to ambient temperature.

Grasso, Albert P. (Vernon, CT)

1986-01-01T23:59:59.000Z

122

Liquid level detector  

DOE Patents (OSTI)

A liquid level detector for low pressure boilers. A boiler tank, from which vapor, such as steam, normally exits via a main vent, is provided with a vertical side tube connected to the tank at the desired low liquid level. When the liquid level falls to the level of the side tube vapor escapes therethrough causing heating of a temperature sensitive device located in the side tube, which, for example, may activate a liquid supply means for adding liquid to the boiler tank. High liquid level in the boiler tank blocks entry of vapor into the side tube, allowing the temperature sensitive device to cool, for example, to ambient temperature.

Grasso, A.P.

1984-02-21T23:59:59.000Z

123

Room noise criteria standards: What features are important?  

Science Journals Connector (OSTI)

At the joint meeting of ASA and NOISE?CON 97 in June 1997 the authors organized a special session on room noise criteria in which a ‘‘questionnaire’’ on the features of several existing noise criteria methods was answered by panel experts and distributed to the noise control community for their inputs. The four methods were: the A?weighted sound?pressure level; the noise criteria (NC) tangency method contained in older versions of the ASHRAE handbook; the balanced noise criterion method (NCB) contained in ANSI S12.2; and the room criteria method (RC) contained in ANSI S12.2 and the current ASHRAE handbook. The features considered were: speech interference high?frequency annoyance mid/low frequency annoyance very low?frequency annoyance pure tones temporal fluctuations user friendliness wider frequency range speech privacy costs and ability to handle noises with abnormal characteristics and complexity. The questionnaire rating was twofold: (1) how well does each method adequately account for each of the ‘‘features’’ (or characteristics) relative to the other methods and (2) what is the relative importance of each of the ‘‘features’’ in a noise criteria method. This paper presents the results of the questionnaires and reports progress since the joint meeting in ANSI S12 WG18 and ASHRAE TC2.6.

Hsien?sheng (Jason) Pei; Robert D. Hellweg Jr.; Richard Peppin

1997-01-01T23:59:59.000Z

124

Effect of long-term outdoor air pollution and noise on cognitive and psychological functions in adults  

Science Journals Connector (OSTI)

Abstract It has been hypothesized that air pollution and ambient noise might impact neurocognitive function. Early studies mostly investigated the associations of air pollution and ambient noise exposure with cognitive development in children. More recently, several studies investigating associations with neurocognitive function, mood disorders, and neurodegenerative disease in adult populations were published, yielding inconsistent results. The purpose of this review is to summarize the current evidence on air pollution and noise effects on mental health in adults. We included studies in adult populations (?18 years old) published in English language in peer-reviewed journals. Fifteen articles related to long-term effects of air pollution and eight articles on long-term effects of ambient noise were extracted. Both exposures were separately shown to be associated with one or several measures of global cognitive function, verbal and nonverbal learning and memory, activities of daily living, depressive symptoms, elevated anxiety, and nuisance. No study considered both exposures simultaneously and few studies investigated progression of neurocognitive decline or psychological factors. The existing evidence generally supports associations of environmental factors with mental health, but does not suffice for an overall conclusion about the independent effect of air pollution and noise. There is a need for studies investigating simultaneously air pollution and noise exposures in association mental health, for longitudinal studies to corroborate findings from cross-sectional analyses, and for parallel toxicological and epidemiological studies to elucidate mechanisms and pathways of action.

Lilian Tzivian; Angela Winkler; Martha Dlugaj; Tamara Schikowski; Mohammad Vossoughi; Kateryna Fuks; Gudrun Weinmayr; Barbara Hoffmann

2015-01-01T23:59:59.000Z

125

Considerations of noise and performance on a secondary task for the use of compressed speech in a cockpit environment  

E-Print Network (OSTI)

intelligibility and comprehension of compressed speech and are stated in combined form as follows: I. Condition: a quiet environment with no competing task Measures: intelligibility, comprehension H : There are no differences between compression levels 0 H... A. H : Noise has no effect on the intelligibility of 0 compressed speech H : Noise produces a main effect on intelligi- al bi 1 i ty H: There is an interaction effect of noise and a2 level of compression on intelligibility B. H: Noise has...

Crittenden, Lorri June

2012-06-07T23:59:59.000Z

126

Noise from Centrifugal Fans  

Science Journals Connector (OSTI)

The sound power radiated from the discharge of centrifugal fans of diameters between 3 and 6 1 2 ? inches has been measured as a function of fan dimensions and operating conditions. The measurements were made by arranging the fan under test to discharge into an 11 foot nonreflecting tube in which the static pressure could be controlled. Air was exhausted from the tube through a side port of high acoustic impedance located part way down the tube. The detectingmicrophone which is located in the tube between the exit port and the acoustic termination is out of the air stream and therefore not subject to wind noise. The total discharge noise power P in watts in the range 75 to 10 000 cps was found empirically to be given by P?=?0.90?×?10 ?4 (D/W)?H 3 ?+?5.2?×?10 ?10 (Q 5 /W 4 D 8 ) where D and W are the fan diameter and width respectively in inches H is the static pressure in inches of water and Q is the air flow in cubic feet per minute. The angular frequency of the fan wheel does not appear explicitly since this quantity is uniquely specified by H Q D and W. Spectral analysis indicates that the power is concentrated primarily at low frequencies. Application of the results of this study to design problems will be discussed.

R. B. Goldman; G. C. Maling

1955-01-01T23:59:59.000Z

127

Number of Nevi and Early-Life Ambient UV Exposure Are Associated with BRAF-Mutant Melanoma  

Science Journals Connector (OSTI)

...Epidemiology, University of New Mexico, Albuquerque, New Mexico; Departments of 5 Pathology and...regarding their risk factors. Ambient solar UV exposures were estimated using...increased number of melanocytic nevi, solar UV exposure, including high levels...

Nancy E. Thomas; Sharon N. Edmiston; Audrey Alexander; Robert C. Millikan; Pamela A. Groben; Honglin Hao; Dawn Tolbert; Marianne Berwick; Klaus Busam; Colin B. Begg; Dianne Mattingly; David W. Ollila; Chiu Kit Tse; Amanda Hummer; Julia Lee-Taylor; and Kathleen Conway

2007-05-01T23:59:59.000Z

128

NETL: Ambient Monitoring - Steubenville Comprehensive Air Monitoring  

NLE Websites -- All DOE Office Websites (Extended Search)

Steubenville Comprehensive Air Monitoring Project (SCAMP) Steubenville Comprehensive Air Monitoring Project (SCAMP) The National Ambient Air Quality Standards for airborne fine particles (PM2.5) are based on the mass of PM2.5 measured at outdoor monitoring stations; however, most people spend the majority of their time indoors. In order to fully understand the relationship between ambient PM2.5 and human health effects, it is important to define how ambient PM2.5 concentrations and compositions compare to those actually breathed by humans during normal daily activities. The objective of SCAMP is to measure the concentrations of PM2.5 and other potential air pollutants at ambient monitoring stations in and around Steubenville, OH, and relate them to the pollutant concentrations in air that is actually breathed by people living in the area. Steubenville was chosen by DOE for this study because of the ability to integrate its results with those of the UORVP, and also because Steubenville was one of the six cities where correlations between ambient PM2.5 mass and adverse health effects had been noted. These correlations had been cited by EPA as one of the primary justifications for its 1997 ambient PM2.5 standards. Complete characterization of the relationships between ambient PM2.5 and human exposure, including the chemical components of PM2.5 at various locations, will provide a comprehensive database for use in subsequent epidemiological studies, long-range transport studies, and State Implementation Program development. CONSOL Energy is the primary performer of SCAMP, and will provide the necessary coordination and data integration between the various components of the study.

129

Ambient noise tomography for wavespeed and anisotropy in the crust of southwestern China  

E-Print Network (OSTI)

The primary objective of this thesis is to improve our understanding of the crustal structure and deformation in the southeastern Tibetan Plateau and adjacent regions using surface wave tomography. Green's functions for ...

Huang, Hui, Ph. D. Massachusetts Institute of Technology

2014-01-01T23:59:59.000Z

130

Reconstruction of subsurface structure from ambient seismic noise: an example from Ketzin, Germany  

Science Journals Connector (OSTI)

......deterministic seismic responses using only passive...retrieved reflection response can be used in many...seismic reflection response can also possibly...relatively high-frequency geophones (28 Hz...at the Ketzin CO2 storage site (Forster et...passive seismic energy may be natural......

Zhuo Xu; Christopher Juhlin; Olafur Gudmundsson; Fengjiao Zhang; Can Yang; Artem Kashubin; Stefan Lüth

2012-05-01T23:59:59.000Z

131

Reducing Uncertainty in Estimates of Environmental Parameters From Ambient Noise Using Statistical Array Processing /  

E-Print Network (OSTI)

random media,” J. Phys. A: Math. ?eor. , vol. 44, p. 065102,random media,” J. Phys. A: Math. ?eor. , vol. 44, p. 065102,media,” J. Phys. A: Math. ?eor. 44, 065102 [24] R. Menon, P.

Menon, Ravishankar

2013-01-01T23:59:59.000Z

132

Quantum noise in optical interferometers  

SciTech Connect

We study the photon counting noise in optical interferometers used for gravitational wave detection. In order to reduce quantum noise, a squeezed vacuum is injected into the usually unused input port. It is investigated under which conditions the gravitational wave signal may be amplified without increasing counting noise concurrently. Such a possibility was suggested as a consequence of the entanglement of the two output ports of a beam splitter. We find that amplification without concurrent increase of noise is not possible for reasonable squeezing parameters. Photon distributions for various beam splitter angles and squeezing parameters are calculated.

Voronov, Volodymyr G.; Weyrauch, Michael [Faculty of Physics, Taras Shevchenko National University of Kyiv, 03022 Kyiv (Ukraine); Physikalisch-Technische Bundesanstalt, D-38116 Braunschweig (Germany)

2010-05-15T23:59:59.000Z

133

Characterization of aircraft noise during thrust reverser engagement  

Science Journals Connector (OSTI)

Airport noise impact on communities has been an area of considerable study. However it has been determined that thrust reverser engagement is an area requiring further research. This paper presents findings on thrust reverser from a noise study done at Washington?Dulles International Airport (IAD) in October of 2004. Previous studies have found that high levels of acoustic energy in commercial aircraft during takeoff are contained below 300 Hz [Sharp Ben H. Guovich Yuri A. and Albee William W. ‘‘Status of Low?Frequency Aircraft Noise Research and Mitigation ’’ Wyle Report WR 01?21 San Francisco September 2001]. Preliminary analysis of thrust reverser signatures indicates similar findings. A categorization of aircraft noise during thrust reverser engagement is given and looks at factors that may affect the noise characteristics. Some of these factors include: plane type engine type and thrust ratings. In addition a brief analysis of frequency weightings of the Equivalent Sound Level (Leq) and Sound Exposure Level (SEL) metrics and their application to thrust reverser noise is discussed. [Work supported by the Federal Aviation Administration.

2005-01-01T23:59:59.000Z

134

11 - Noise, vibration, and harshness (NVH) in diesel engine system design  

Science Journals Connector (OSTI)

Abstract: This chapter addresses NVH characteristics in diesel engine system design. By focusing on engine noise – a critical performance attribute for engine competitiveness, this chapter provides a comprehensive coverage of the NVH issues that a system engineer can evaluate by using engine system design/analysis tools. The chapter starts by introducing the fundamental principles of powertrain and diesel engine NVH, and establishes a three-level system modeling approach to engine noise. It summarizes the noise characteristics and noise-reduction design measures for both the overall engine and individual subsystems such as the noises from combustion, piston slap, valvetrain, geartrain, cranktrain, auxiliary, and aerodynamic sources.

Qianfan Xin

2013-01-01T23:59:59.000Z

135

Ambient Hydro Ltd | Open Energy Information  

Open Energy Info (EERE)

Ambient Hydro Ltd Ambient Hydro Ltd Place Corsham, United Kingdom Zip SN13 9TZ Sector Hydro, Services Product Ambient Hydro Ltd develops small Hydroelectric projects. It also offers a range of technical and financial consultancy services. Coordinates 51.431505°, -2.187229° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":51.431505,"lon":-2.187229,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

136

Influence of refraction on wind turbine noise  

E-Print Network (OSTI)

A semi-empirical method is applied to calculate the time-average sound level of wind turbine noise generation and propagation. Both are affected by wind shear refraction. Under upwind conditions the partially ensonified zone separates the fully ensonified zone (close to the turbine) and the shadow zone (far away from the turbine). Refraction is described in terms of the wind speed linear profile fitted to the power law profile. The rotating blades are treated as a two-dimensional circular source in the vertical plane. Inside the partially ensonified zone the effective A-weighted sound power decreases to zero when the receiver moves from the turbine toward the shadow zone. The presented results would be useful in practical applications to give a quick estimate of the effect of refraction on wind turbine noise.

Makarewicz, Rufin

2013-01-01T23:59:59.000Z

137

5th International Meeting Wind Turbine Noise  

E-Print Network (OSTI)

1 5th International Meeting on Wind Turbine Noise Denver 28 ­ 30 August 2013 Wind Turbine Noise Broadband noise generated aerodynamically is the dominant noise source for a modern wind turbine(Brooks et, clean energy. While profiting from wind energy, the noise produced by a modern wind turbine becomes

Paris-Sud XI, Université de

138

Greatly enhanced acoustic noise and the onset of stimulated Brillouin scattering  

SciTech Connect

Experiments using near-infrared to ultraviolet lasers offer the potential to study the acoustic noise in plasmas. As the onset of stimulated Brillouin scattering (SBS) has come to be closely examined, the evidence indicates that the acoustic noise may often or always be far above thermal levels. Evidence regarding the noise is reported here, from two recent experiments which confirmed the theoretically anticipated onset behavior for SBS. In one case, the noise appears to be greatly enhanced above thermal levels. In the other case, the data place an upper limit on the noise level. There is physical grounds to believe that enhanced acoustic noise may be ubiquitous in plasmas, even in the absence of plasma instabilities which drive turbulence. {copyright} {ital 1997 American Institute of Physics.}

Drake, R.P. [University of Michigan, Ann Arbor, Michigan 48109-2143 (United States)] [University of Michigan, Ann Arbor, Michigan 48109-2143 (United States); Estabrook, K. [Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551 (United States)] [Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551 (United States); Watt, R.G. [Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545 (United States)] [Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545 (United States)

1997-05-01T23:59:59.000Z

139

A first step toward a close proximity noise map  

Science Journals Connector (OSTI)

In recent years environmental noise has become a serious issue for civil infrastructure and environmental administration due to public concern over the subject of noise pollution. The most significant deterioration of environmental acoustics conditions comes from road traffic transportation. The predominant noise source is the combination of the tire/pavement interaction and the propulsion systems of the vehicles. Generally tire/pavement interaction is the principal source of noise for speeds above 40 km/h in the case of most modern cars. In this research geo?referenced close proximity rolling noise is used for acoustical characterization of asphalt concrete surfaces in an urban environment. A close proximity noise map of streets with low speed limits is presented for a reference speed of 50 km/h. Different pavements and pavement conditions common in urban streets are analyzed: dense and semidense asphalt concrete with Spanish denomination D?8 and S?12 respectively and on the other hand dense pavement at the end of its service life (D?8*). Noise levels from dense surfaces (D?8) increase significantly over time principally due to the appearance of surface defects such as cracks and ruts.

Moises Bueno; Urbano Viñuela; Fernando Terán; S. E. Paje; Jeane Luong

2008-01-01T23:59:59.000Z

140

Corpuscular theory of intensity noise with gain compression  

Science Journals Connector (OSTI)

When light from a laser is fully absorbed by an ideal detector, the detected current exhibits a fluctuation called here ‘‘photonic noise.’’ The spectral density of Iintensity noiseR, defined as the difference of the photonic-noise spectral density and a term corresponding to the shot-noise level, is negative for sub-Poissonian statistics. The usefulness of the relative-intensity-noise concept is that it is independent of any linear attenuation. A simple circuit theory of intensity noise based only on energy conservation and the Nyquist formula (zero-point fluctuation) leads to expressions of the spectral densities that agree with quantum theory even for sub-Poissonian photon statistics. When the optical gain and loss are frequency independent, the circuit theory reduces to a corpuscular theory that keeps track of the time rates of change of electron and photon numbers treated as continuous variables. Consideration is given to laser diodes in which the rate of electron-photon conversion depends nonlinearly on both the carrier and photon densities. The cross-spectral density between electrical-voltage and relative photonic fluctuations is independent of internal or external optical losses. Standard rate equations are inaccurate in the case of gain compression. Very general yet simple formulas for intensity noise are applied to room-temperature GaAs laser diodes, using recently calculated optical parameters.

J. Arnaud

1992-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Projection screen having reduced ambient light scattering  

DOE Patents (OSTI)

An apparatus and method for improving the contrast between incident projected light and ambient light reflected from a projection screen are described. The efficiency of the projection screen for reflection of the projected light remains high, while permitting the projection screen to be utilized in a brightly lighted room. Light power requirements from the projection system utilized may be reduced.

Sweatt, William C. (Albuquerque, NM)

2010-05-11T23:59:59.000Z

142

Control of Noise in Power Station Cooling Tower Systems  

Science Journals Connector (OSTI)

Power?station cooling tower systems must handle large volumes of water and air with large potential energy in the water flows and the requirement for large fans. To minimize the noise generated at power station sites use is made of efficient tower fill materials dual low?speed fans (which shifts the spectrum and lowers mid?frequency noise level) and barrier effects in tower location and orientation. Conventional noise control measures such as mufflers are avoided because of the required increase in pressure across the fan and the high initial cost for quieting large towers. The use of natural draft towers is discussed and it is shown that although the low?frequency noise may be reduced the noise levels at typical property line locations are of the same order of magnitude as that for conventional mechanical cooling towers. Since cooling towers at power stations are required as an environmental (thermal) pollution control measure a trade?off between temperature rise of local water supplies versus increases in community noise becomes a critical factor.

Lewis S. Goodfriend

1973-01-01T23:59:59.000Z

143

Human response to combined noise and vibration.  

E-Print Network (OSTI)

??The discomfort caused by the noise and vibration in cars is investigated in this thesis to improve understanding of how subjective judgements of noise and… (more)

Huang, Yuan

2012-01-01T23:59:59.000Z

144

Six?year study of IMSA road racing noise  

Science Journals Connector (OSTI)

The Del Mar Fairgrounds San Diego hosted the IMSA Grand Prix for 6 years from 1987–1993. The project provides a unique long?term study of professional road racing noise in a unique setting a narrow valley just east of the coastline and within an environmentally sensitive lagoon. Sponsors were required to perform community noise monitoring at selected locations in the adjacent hills and lagoon. Both human and bird responses were examined. The monitoring documented the hour by hour variations in the maximum and average noise levels at up to 12 separate locations. The results indicated the thresholds which would trigger community response the sensitivity of the response to diurnal and short?term wind shift the effect of the inversion layer the effects on bird patterns and the statistical distribution of vehicle noise levels for the IMSA class vehicle. Basic findings revealed community response was triggered when levels exceeded 70 dBA Lavg. Downwind levels tended to increase at 1 dBA/mph over 5 mph. When the track was within an inversion levels increased 10 dBA. The mean vehicle level at 15 m was 105 dBA with a 4?dBA standard deviation.

Gordon Bricken; Christopher Jean

1997-01-01T23:59:59.000Z

145

Noise in relation to annoyance, performance, and mental health  

Science Journals Connector (OSTI)

There are many psychological factors which cause differences of human response to the same level of sound energy. Nevertheless experiments have allowed these factors to be understood at least to the extent where policy decisions can be made. The results show that increasing levels of noise increase annoyance probably increasing the general arousal or excitability of the nervous system. This gives changes in performance which are sometimes detrimental but not by any means always. Annoyance is associated with psychiatric ill?health but increases in noise do not appear to increase the proportion of people with such illness.

Donald E. Broadbent

1980-01-01T23:59:59.000Z

146

Wind?energy farm noise impacts on nearby residences—the citizen's view  

Science Journals Connector (OSTI)

Wind?energy farms with hundreds of wind turbines have proliferated in close proximity to residential properties without any apparent control on the noise impact consequences. Annoying and intrusive wind turbinenoise occurred as soon as the first turbines were installed. The adverse noise impact has continued and intensified as additional WECS (wind energy conversion system) sites were approved and developed with the installation of hundreds of additional turbines. The adverse noiseeffects consist of low?frequency noise that is not fully addressed or controlled by only A?weighted sound level standards pure tones and higher noise levels during higher wind?speed conditions. More stringent noise controls should have been implemented in the beginning. Riverside County has recently adopted a more stringent noise standard that also includes a pure tone restriction that will apply to future sites. However mitigation of the mistakes made at the earlier sites remains to be resolved.

John R. Warner

1986-01-01T23:59:59.000Z

147

Highly linear low noise amplifier  

E-Print Network (OSTI)

, the Low Noise Amplifier (LNA) is expected to provide high linearity, thus preventing the intermodulation tones created by the interference signal from corrupting the carrier signal. The research focuses on designing a novel LNA which achieves high...

Ganesan, Sivakumar

2007-09-17T23:59:59.000Z

148

sub-ambient-membrane | netl.doe.gov  

NLE Websites -- All DOE Office Websites (Extended Search)

CO2 Capture by Sub-Ambient Membrane Operation Project No.: DE-FE0004278FE0013163 American Air Liquide, Inc. will develop a system for CO2 capture based on sub-ambient temperature...

149

Vermont Air Pollution Control Regulations, Ambient Air Quality Standards (Vermont)  

Energy.gov (U.S. Department of Energy (DOE))

The ambient air quality standards are based on the national ambient air quality standards. The Vermont standards are classified as primary and secondary standards and judged adequate to protect...

150

An investigation of the noise dynamics in a southern illinois underground coal mine.  

Science Journals Connector (OSTI)

Noise in an underground coal mine has dominant components generated mainly from three sources: (1) continuous mining machine (CMM) (2) roof bolters and (3) cars/vehicles which are transporting personnel end/or coal. Each of these three noise sources also has a number of well defined sub?sources with their own noise characteristics. The CMM noise is comprised mainly of noisegenerated by coal cutting drum wet scrubber for dust control and coal transport conveyor (called also the CMM’s tail). Roof bolter’s noise is generated during the drilling of the roof bolt holes in the bolting process. Personnel and coaltransportationvehiclesgeneratenoise from the power driven system. The personnel most exposed to these noises are operators of these machines and associated support personnel. Three selected techniques with appropriate instrumentation were used to monitor exposure of the personnel to the noise and noise energy over a period of time. The most common technique is based on the use of personal noise dosimeters. The sound level meters (both pressure and power) were also used to collect noise data in form of instantaneous readings and also to check calibration of other sound measuring instruments. Most useful information was obtained from continuous recordings of the noise over time. This paper discusses the variability or dynamics of the generatednoise in both frequency and time domains

Marek Szary; Yoginder Chugh; William Bell; Joseph Hirschi

2010-01-01T23:59:59.000Z

151

Smart Lighting: LED Implementation and Ambient Communication Applications  

E-Print Network (OSTI)

Smart Lighting: LED Implementation and Ambient Communication Applications by Nicholas Adrian Galano............................................................................................................................................1 LED Implementation..........................................................................................................................2 LED Energy Usage

Agogino, Alice M.

152

Ambient Control Systems | Open Energy Information  

Open Energy Info (EERE)

Control Systems Control Systems Jump to: navigation, search Logo: Ambient Control Systems Name Ambient Control Systems Address 1810 Gillespie Way Place El Cajon, California Zip 92020 Sector Solar Product Solar energy device with a computerized energy management Website http://www.ambientalert.com/ma Coordinates 32.8193566°, -116.981232° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":32.8193566,"lon":-116.981232,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

153

Ambient air monitoring for organic compounds, acids, and metals at Los Alamos National Laboratory, January 1991  

SciTech Connect

Los Alamos National Laboratory (LANL) contracted Radian Corporation (Radian) to conduct a short-term, intensive air monitoring program whose goal was to estimate the impact of chemical emissions from LANL on the ambient air environment. A comprehensive emission inventory had identified more than 600 potential air contaminants in LANL's emissions. A subset of specific target chemicals was selected for monitoring: 20 organic vapors, 6 metals and 5 inorganic acid vapors. These were measured at 5 ground level sampling sites around LANL over seven consecutive days in January 1991. The sampling and analytical strategy used a combination of EPA and NIOSH methods modified for ambient air applications.

Williams, C.H. (Radian Corp., Austin, TX (United States)); Eberhart, C.F. (Los Alamos National Lab., NM (United States))

1992-01-01T23:59:59.000Z

154

Ambient air monitoring for organic compounds, acids, and metals at Los Alamos National Laboratory, January 1991  

SciTech Connect

Los Alamos National Laboratory (LANL) contracted Radian Corporation (Radian) to conduct a short-term, intensive air monitoring program whose goal was to estimate the impact of chemical emissions from LANL on the ambient air environment. A comprehensive emission inventory had identified more than 600 potential air contaminants in LANL`s emissions. A subset of specific target chemicals was selected for monitoring: 20 organic vapors, 6 metals and 5 inorganic acid vapors. These were measured at 5 ground level sampling sites around LANL over seven consecutive days in January 1991. The sampling and analytical strategy used a combination of EPA and NIOSH methods modified for ambient air applications.

Williams, C.H. [Radian Corp., Austin, TX (United States); Eberhart, C.F. [Los Alamos National Lab., NM (United States)

1992-10-01T23:59:59.000Z

155

Electric Power From Ambient Energy Sources  

SciTech Connect

This report summarizes research on opportunities to produce electric power from ambient sources as an alternative to using portable battery packs or hydrocarbon-fueled systems in remote areas. The work was an activity in the Advanced Concepts Project conducted by Pacific Northwest National Laboratory (PNNL) for the Office of Research and Development in the U.S. Department of Energy Office of Nonproliferation and National Security.

DeSteese, John G.; Hammerstrom, Donald J.; Schienbein, Lawrence A.

2000-10-03T23:59:59.000Z

156

E-Print Network 3.0 - ambient air quality-a Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

EHHE; January 2006 7 Topics Air, Ambient (Outdoor) Air, Indoor Disasters Lead... pollutants in ambient air Hazardous or toxic substances released in ambient air Residence in...

157

E-Print Network 3.0 - ambient air monitoring Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

EHHE; January 2006 7 Topics Air, Ambient (Outdoor) Air, Indoor Disasters Lead... pollutants in ambient air Hazardous or toxic substances released in ambient air Residence in...

158

Emissions Standards and Ambient Environmental Quality Standards in  

E-Print Network (OSTI)

Emissions Standards and Ambient Environmental Quality Standards in Stochastic Receiving Media quality standards, for in- stance SO2 emissions are capped under Title IV of the U.S. Clean Air Act Amendments while ambient SO2 concentrations are limited under National Ambient Air Quality Standards (NAAQS

Silver, Whendee

159

Clean air act and National Ambient Air Quality Standards (NAAQS)  

E-Print Network (OSTI)

Clean air act and National Ambient Air Quality Standards (NAAQS) Ozone: Sources/Environmental Effects Particulates (PM): Sources/Environmental Effects #12;National Ambient Air Quality Standards (NAAQS) The Clean Air Act requires EPA to set National Ambient Air Quality Standards for pollutants considered

Weber, Rodney

160

Metric assessment of subjective annoyance due to low frequency aircraft noise  

Science Journals Connector (OSTI)

A low frequency noise study was conducted at the Pennsylvania State University to investigate human response to the low frequency content of aviation noise. Metric assessment included level based and loudness metrics including time?varying loudness. Current predictive noise models and metrics may underestimate the impact of low?frequency noise produced by aviation noise. Assessing the role of low frequency noise on human response will facilitate understanding how this type of noise can impact communities. Indoor recordings of aircraft arrivals and departures at Washington Dulles International Airport made in 2004 were used to assess subjective noise annoyance. These recordings and low?frequency variants of these recordings were reproduced for subjects through the Gulfstream Supersonic Acoustic Signature Simulator II (SASS II); the signatures were then rated for annoyance. Subjective judgments were statistically analyzed and compared against objective metrics that were calculated for each signature. Results are shown that all things being equal higher levels of low?frequency content in aircraft noise can result in increased annoyance in subjects. The C?weighted sound exposure level was found to correlate well with the subjective annoyance response.

Kathleen Hodgdon; Matthew L. Nickerson; Anthony A. Atchley; Thomas Gabrielson

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Subjective response to low?frequency aircraft noise  

Science Journals Connector (OSTI)

The standard metric currently in use by the U.S. government for community noise from aircraft is the day?night level (DNL) which is based on the A?weighting network. However residents of communities near airports have reported annoyance due to aircraft noise in greater proportion than what the DNL contour associated with their address predicts. Complaints of ‘‘distant rumbling’’ appear to be related to the low?frequency noise that aircraft produce for which the DNL metric does not fully account. This presentation discusses measurements made in October 2004 at two residences near runways at Washington?Dulles International Airport. Noise data are recorded both inside and outside the structures allowing for a measure of the events’ impact both inside and outside the structure as well as the filtering effect of the structure on the signal. Laboratory subjective evaluation studies of the recorded aircraft signatures are conducted. Objective metrics those that are designed for low?frequency noise and those that are not are calculated and correlated with subjective rankings of the signatures. This gauges the metrics’ effectiveness in predicting subjective perception of aircraft noise signatures. [Work supported by the Federal Aviation Administration and the Exploratory and Foundational Program of the Applied Research Laboratory Penn State University.

2005-01-01T23:59:59.000Z

162

The Shot Noise Thermometer Lafe Frederick Spietz  

E-Print Network (OSTI)

Abstract The Shot Noise Thermometer Lafe Frederick Spietz 2006 This thesis describes the development and testing of the shot noise thermometer, or SNT, a new kind of noise thermometer based thermometer, the noise power from a tunnel junction is measured as a function of the DC voltage across

163

The Shot Noise Thermometer Lafe Frederick Spietz  

E-Print Network (OSTI)

Abstract The Shot Noise Thermometer Lafe Frederick Spietz 2006 This thesis describes the development and testing of the shot noise thermome- ter, or SNT, a new kind of noise thermometer based thermometer, the noise power from a tunnel junction is measured as a function of the DC voltage across

164

Noise and the Sound Insulation of Buildings  

Science Journals Connector (OSTI)

...Noise and the Sound Insulation of Buildings F. Ingerslev It is claimed that noise...well-being. An outstanding task for the building industry in the 1980s is to ensure a proper noise climate in new buildings. The target must be to obtain a noise...

1972-01-01T23:59:59.000Z

165

Wind turbine aeroacoustic noise and noise mitigation strategies.  

Science Journals Connector (OSTI)

Wind turbines are becoming an important piece of the solution to low?carbon power production. However as more turbines are installed near population centers the environmental impacts associated with these machines such as noise are also becoming more obvious. Aeroacousticnoise is generally thought to be the greatest source of acoustical noise in wind turbine systems. This study will present measurement results collected at the National Wind Technology Center on an operating wind turbine that characterize the total received acoustic field surrounding the turbine. Designs and preliminary measurements of trailing edge modifications to the outboard airfoil sections will be discussed as a means of partial noise mitigation. In addition future aeroacousticnoise treatments and measurement plans will be mentioned.

Michael Asheim; Paul Papas; Patrick Moriarty; Jon Collis

2010-01-01T23:59:59.000Z

166

Noise Amplitude Distribution of Impulsive Noise from Measurements in a Power Substation  

E-Print Network (OSTI)

Noise Amplitude Distribution of Impulsive Noise from Measurements in a Power Substation Qingshan-This paper presents ultra-wide-band measurements of impulsive noise within an electricity substation compound analysis of these events is presented. Index Terms--Electricity substation, impulsive noise, noise

Atkinson, Robert C

167

Wind farm—Long term noise and vibration measurements  

Science Journals Connector (OSTI)

Most of the energy produced in Quebec comes from renewable sources. The concept of wind energy emerged in the late 1990’s and has since become a complementary source of energy alongside hydroelectricity. Wind farms are generally seen as a good sustainable way to produce energy. However they are not implemented without some impact on the environment. SNC-Lavalin Environment has performed many surveys in recent years for wind farm projects including noise measurements both before and after their commissioning. This presentation will give an overview of one such project where long term noise and vibration measurements where conducted. Vibration measurements as well as outdoor indoor and low frequencies noise measurements were completed both with and without the wind turbines in operation. Data will be presented showing different problems encountered in the analysis phase. For example multiple intermittent and non-steady noise sources were present during measurement (wind turbines car pass-bys wind in the trees human activities). Methods used to overcome these obstacles will be discussed (use of statistical parameters linear regression) and the effect of the wind turbine operation on the noise level (including low frequencies) and vibration level will be presented.

2013-01-01T23:59:59.000Z

168

Wind Farm - Long term noise and vibration measurements  

Science Journals Connector (OSTI)

Most of the energy produced in Quebec comes from renewable sources. The concept of wind energy emerged in the late 1990's and has since become a complementary source of energy alongside hydroelectricity. Wind farms are generally seen as a good sustainable way to produce energy. However they are not implemented without some impact on the environment. SNC-Lavalin Environment has performed many surveys in recent years for wind farm projects including noise measurements both before and after their commissioning. This presentation will give an overview of one such project where long term noise and vibration measurements where conducted. Vibration measurements as well as outdoor indoor and low frequencies noise measurements were completed both with and without the wind turbines in operation. Data will be presented showing different problems encountered in the analysis phase. For example multiple intermittent and non-steady noise sources were present during measurement (wind turbines car pass-bys wind in the trees human activities). Methods used to overcome these obstacles will be discussed (use of statistical parameters linear regression) and the effect of the wind turbine operation on the noise level (including low frequencies) and vibration level will be presented.

Martin Meunier

2013-01-01T23:59:59.000Z

169

Modeling of offshore wind turbine noise radiation and propagation  

Science Journals Connector (OSTI)

Noisegenerated by offshore wind turbine and support structure can radiate and propagate through the air water and sediment. Predicting noise levels around wind turbinestructures at sea is required for the estimation of effects of the noise on marine life. To predict radiated noise we used a finite element analysis(FEA) of a cylindrical shell model of a monopile structure. In the finite element modeling transient modal dynamic analysis and steady state dynamic analysis (direct and modal) were implemented to simulate both construction and operational noise. The effect of various sediment types and foundation designs are investigated. The FEA package used was ABAQUS version 6.10. The output of the FEAanalysis is used as starting field for acoustic propagation models such as PE to produce long range predictions. We present predictions of particle velocity at the structure-acoustic medium interface and sound pressure level as function of frequency at various distances from the structure. Laboratory experiments using scale models of the cylindrical shell have been carried out to verify the noise predictions. Comparison of the FEAmodel results and experimental data will be presented.

Huikwan Kim; Gopu R. Potty; James H. Miller; Christopher Baxter

2011-01-01T23:59:59.000Z

170

Correlated noise in networks of gravitational-wave detectors: Subtraction and mitigation  

E-Print Network (OSTI)

demonstrates that correlated magnetic fields from Schumann resonances can produce correlated strain noise over with continued integration. In a previous paper, we showed that magnetic fields from global Schumann resonances correlated noise from Schumann resonances is too low level to affect stochastic searches with first

Christensen, Nelson

171

A Charge Recycling Differential Noise Immune Jabulani Nyathi, Valeriu Beiu, Suryanarayana Tatapudi, and David 3. Betowski  

E-Print Network (OSTI)

A Charge Recycling Differential Noise Immune Perceptron Jabulani Nyathi, Valeriu Beiu in [SI, [91, [lo]. recycling differential noise-immune threshold logic (CRD-NTL) In this paper we shall focus primarily on charge recycling perceptron is based on combining the split-level precharge

Nyathi, Jabulani

172

Improving SMOTE with Fuzzy Rough Prototype Selection to detect Noise in Imbalanced  

E-Print Network (OSTI)

). Using fuzzy rough set theory, the noise level of each instance is measured, and instances for which Rough Set The- ory 1 Introduction Imbalanced classification has become an important field in data mining on fuzzy rough set theory [7]. Next, we remove all instances that have a noise

Gent, Universiteit

173

Fast quantum noise in the Landau-Zener transition  

E-Print Network (OSTI)

We show by direct calculation starting from a microscopic model that the two-state system with time-dependent energy levels in the presence of fast quantum noise obeys the master equation. The solution of master equation is found analytically...

Pokrovsky, Valery L.; Sun, D.

2007-01-01T23:59:59.000Z

174

Overcoming correlated noise in quantum systems: How mediocre clocks make good qubits  

E-Print Network (OSTI)

A precise measurement of dephasing over a range of timescales is critical for improving quantum gates beyond the error correction threshold. We present a method for measuring dephasing in experimental quantum systems based on randomized benchmarking that excels at measuring small levels of phase noise at the timescales relevant to gates. We find our SQUID-based qubit is not limited by 1/f flux noise, but instead observe a previously unreported telegraph noise mechanism. We demonstrate that full understanding of dephasing allows for the use of "mediocre clocks"--systems with correlated phase noise--as good qubits.

P. J. J. O'Malley; J. Kelly; R. Barends; B. Campbell; Y. Chen; Z. Chen; B. Chiaro; A. Dunsworth; A. G. Fowler; I. -C. Hoi; E. Jeffrey; A. Megrant; J. Mutus; C. Neill; C. Quintana; P. Roushan; D. Sank; A. Vainsencher; J. Wenner; T. C. White; A. N. Korotkov; A. N. Cleland; John M. Martinis

2014-11-10T23:59:59.000Z

175

Noise and vibration investigations of the Sandia National Laboratories Sol se Mete Aerial Cable Facility  

SciTech Connect

This document is an assessment of the noise, vibration, and overpressure effects and fragmentation hazards of the operation of the Sandia National Laboratories Sol de Mete Aerial Cable Facility (ACF). Major noise sources associated with project operations and considered in this report include rocket motors, chemical explosions, 3-inch gun, 20-mm gun, vehicular traffic, and engines of electricity generators. In addition, construction equipment noise is considered. Noise exposure of ACF personnel is expressed as the equivalent sound level for the 8-hour work day, and is computed by scaling to the proper distance and combining the appropriate noise values for continuously operating equipment such as vehicles and generators. Explosions and gun firings are impulsive events, and overpressures are predicted and expressed as decibel (dB) at the control building, at other nearby facilities, at Sol se Mete. The conclusion reached in the noise analysis is that continuously operating equipment would not produce a serious noise hazard except in the immediate vicinity of the electricity generators and heavy equipment where hearing protection devices should be used. Rocket motors, guns, and detonations of less than 54 kilograms (kg) (120 lb) of explosives would not produce noise levels above the threshold for individual protection at the control building, other nearby test areas, or Sol se Mete Spring. Rare tests involving explosive weights between 54 and 454 kg (120 and 1,000 lb) could produce impulsive noise levels above 140 dB that would require evacuation or other provision for individual hearing protection at the ACF control building and at certain nearby facilities not associated with ACF. Other blast effects including overpressure, ground vibration, and fragmentation produce hazard radii that generally are small than the corresponding noise hazard radius, which is defined as the distance at which the predicted noise level drops to 140 dB.

Matise, B.K.; Gutman, W.M.; Cunniff, R.A.; Silver, R.J.; Stepp, W.E. [New Mexico State Univ., Las Cruces, NM (United States). Physical Science Lab.

1994-11-01T23:59:59.000Z

176

Laser Noise Reduction in Air  

E-Print Network (OSTI)

Fluctuations of the white-light supercontinuum produced by ultrashort laser pulses in selfguided filaments (spatio-temporal solitons) in air are investigated. We demonstrate that correlations exist within the white-light supercontinuum, and that they can be used to significantly reduce the laser intensity noise by filtering the spectrum. More precisely, the fundamental wavelength is anticorrelated with the wings of the continuum, while conjugated wavelength pairs on both sides of the continuum are strongly correlated. Spectral filtering of the continuum reduces the laser intensity noise by 1.2 dB, showing that fluctuations are rejected to the edges of the spectrum.

Pierre Bejot; Jerome Kasparian; Estelle Salmon; Roland Ackermann; Nicolas Gisin; Jean-Pierre Wolf

2006-08-09T23:59:59.000Z

177

Noise cancellation: disrupting audio perception  

Science Journals Connector (OSTI)

Noise cancellation: disrupting audio perception is an interactive sound and visual art installation that explores the creation of new technology - open-air active signal cancellation - and how it can be incorporated into interactive art installations. As an ongoing collaborative project between artist and engineer, noise cancellation engages signal processing research issues in a creative application space. This paper describes the collaborative installation work in progress and discusses why this active signal cancellation technology is important in relation to changing modes of listening and hearing, altering spatial perception and encouraging audiences to fully interact with art installations within art galleries (and related spaces).

Cara-Ann Simpson; Eva Cheng

2013-01-01T23:59:59.000Z

178

Science and the management of underwater noise: Information gaps and polluter power  

Science Journals Connector (OSTI)

To regulate underwater noise rationally and efficiently we need to know its impact on population and community biology. This link can rarely be studied directly because of logistics and the spatial and temporal scales of ecological processes. There are two principal approaches: correlational studies of noise levels with population events or measures; and experiments in which the response variables (usually short?term behavioral measures) are poor proxies for the population and ecosystem parameters about which we are concerned. Experimental studies also have costs. These may include the introduction of additional noise delay of substantive regulation and when polluters are major funders perceived gagging or biasing of knowledgeable scientists. This is a particular problem with underwater noise because the U.S. Navy (a major noise polluter) and allied organizations fund so much acoustic research. Consequently (a) managers must recognize that underwater noise is dangerous but its most important consequences cannot currently be determined; (b) following the precautionary approach noise levels should be reduced sources distanced from marine life and new noises avoided; (c) correlational studies are generally preferred to experimental ones; (d) major noise polluters should not directly fund the research instead providing fees to independent bodies which commission research and recommend regulations.

2001-01-01T23:59:59.000Z

179

Jet Noise Contribution to Wind Noise in Vehicles  

Science Journals Connector (OSTI)

A source of “wind noise” in a vehicle with a slightly opened window has been modeled as a slit jet issuing from a plenum (idealized vehicle). The nondimensional power spectra measured inside and outside were quite similar; the curves collapsed together well when plotted against Strouhal number fD/U (f=frequency D=slit width U=jet nozzle velocity). The higher frequency sources of the jet noise being closer to the slit subtend a larger angle and would be expected to transmit more noise into the plenum. This expectation was confirmed with inward transmission increasing with both frequency and slit width; at 10 000 Hz and 1.5?in. slit width (maxima for these experiments with 80?fps jet velocity) the jet noise power transmitted inward through the slit reached 68% of the power emitted externally in the 1 3 ? oct band. These were exploratory tests and there was no external wind. [Work supported by Air Force Office of Scientific Research.

C.?K. A. Yu; H. S. Ribner

1971-01-01T23:59:59.000Z

180

Experimental noise filtering by quantum control  

E-Print Network (OSTI)

Instabilities due to extrinsic interference are routinely faced in systems engineering, and a common solution is to rely on a broad class of $\\textit{filtering}$ techniques in order to afford stability to intrinsically unstable systems. For instance, electronic systems are frequently designed to incorporate electrical filters composed of, $\\textit{e.g.}$ RLC components, in order to suppress the effects of out-of-band fluctuations that interfere with desired performance. Quantum coherent systems are now moving to a level of complexity where challenges associated with realistic time-dependent noise are coming to the fore. Unfortunately, standard control solutions involving feedback are generally impossible due to the strictures of quantum mechanics, and existing error-suppressing gate constructions generally rely on unphysical bang-bang controls or quasi-static error models that do not reflect realistic laboratory environments. In this work we use the theory of quantum control engineering and experiments with trapped $^{171}$Yb$^{+}$ ions to demonstrate the construction of novel $\\textit{noise filters}$ which are specifically designed to mitigate the effect of realistic time-dependent fluctuations on qubits \\emph{during useful operations}. Starting with desired filter characteristics and the Walsh basis functions, we use a combination of analytic design rules and numeric search to construct time-domain noise filters tailored to a desired state transformation. Our results validate the generalized filter-transfer function framework for arbitrary quantum control operations, and demonstrate that it can be leveraged as an effective and efficient tool for developing novel robust control protocols.

A. Soare; H. Ball; D. Hayes; J. Sastrawan; M. C. Jarratt; J. J. McLoughlin; X. Zhen; T. J. Green; M. J. Biercuk

2014-04-03T23:59:59.000Z

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Ambient Operation of Li/Air Batteries  

SciTech Connect

In this work, Li/air batteries based on nonaqueous electrolytes were investigated in ambient conditions (with an oxygen partial pressure of 0.21 atm and relative humidity of ~20%). A heat-sealable polymer membrane was used as both an oxygen-diffusion membrane and as a moisture barrier for Li/air batteries. The membrane also can minimize the evaporation of the electrolyte from the batteries. Li/air batteries with this membrane can operate in ambient conditions for more than one month with a specific energy of 362 Wh kg-1, based on the total weight of the battery including its packaging. Among various carbon sources used in this work, Li/air batteries using Ketjenblack (KB) carbon-based air electrodes exhibited the highest specific energy. However, KB-based air electrodes expanded significantly and absorbed much more electrolyte than electrodes made from other carbon sources. The weight distribution of a typical Li/air battery using the KB-based air electrode was dominated by the electrolyte (~70%). Lithium-metal anodes and KB-carbon anodes account for only 5.12% and 5.78% of the battery weight, respectively. We also found that only ~ 20% of the mesopore volume of the air electrode was occupied by reaction products after discharge. To further improve the specific energy of the Li/air batteries, the microstructure of the carbon electrode needs to be further improved to absorb much less electrolyte while still holding significant amounts of reaction products

Zhang, Jiguang; Wang, Deyu; Xu, Wu; Xiao, Jie; Williford, Ralph E.

2010-07-01T23:59:59.000Z

182

Acoustical criteria in a two?parameter system for evaluating impact noise insulation.  

Science Journals Connector (OSTI)

Experience indicates that impact noise complaints in multi?family joist?framed buildings fall into two broad classes: low frequency thudding from footfalls and mid? to high frequency noise from heel clicks dragging furniture etc. The authors have developed a two?parameter system for evaluating impact noise [LoVerde and Dong J. Acoust. Soc. Am. 119 3220 (2006); 120 3206 (2006); 122 2954 (2007)] that offers considerable improvement over existing metrics (such as FIIC) in terms of both correlation with subjective reaction and comparison of materials intended for improving impact insulation. Based on this system suggested criteria for impact noise levels are presented. The effects of various design parameters on noise levels are discussed.

2009-01-01T23:59:59.000Z

183

Suspending Effect on Low-Frequency Charge Noise in Graphene Quantum Dot  

E-Print Network (OSTI)

Charge noise is critical in the performance of gate-controlled quantum dots (QDs). Here we show the 1/f noise for a microscopic graphene QD is substantially larger than that for a macroscopic graphene field-effect transistor (FET), increasing linearly with temperature. To understand its origin, we suspended the graphene QD above the substrate. In contrast to large area graphene FETs, we find that a suspended graphene QD has an almost-identical noise level as an unsuspended one. Tracking noise levels around the Coulomb blockade peak as a function of gate voltage yields potential fluctuations of order 1 "{\\mu}eV", almost one order larger than in GaAs/GaAlAs QDs. Edge states rather than substrate-induced disorders, appear to dominate the 1/f noise, thus affecting the coherency of graphene nano-devices.

Xiang-Xiang Song; Hai-Ou Li; Jie You; Tian-Yi Han; Gang Cao; Tao Tu; Ming Xiao; Guang-Can Guo; Hong-Wen Jiang; Guo-Ping Guo

2014-06-16T23:59:59.000Z

184

A computer program for HVDC converter station RF noise calculations  

SciTech Connect

HVDC converter station operations generate radio frequency (RF) electromagnetic (EM) noise which could interfere with adjacent communication and computer equipment, and carrier system operations. A generic Radio Frequency Computer Analysis Program (RAFCAP) for calculating the EM noise generated by valve ignition of a converter station has been developed as part of a larger project. The program calculates RF voltages, currents, complex power, ground level electric field strength and magnetic flux density in and around an HVDC converter station. The program requires the converter station network to be represented by frequency dependent impedance functions. Comparisons of calculated and measured values are given for an actual HVDC station to illustrate the validity of the program. RAFCAP is designed to be used by engineers for the purpose of calculating the RF noise produced by the igniting of HVDC converter valves.

Kasten, D.G.; Caldecott, R.; Sebo, S.A. (Ohio State Univ., Columbus, OH (United States). Dept. of Electrical Engineering); Liu, Y. (Virginia Polytechnic Inst. State Univ., Blacksburg, VA (United States). Bradley Dept. of Electrical Engineering)

1994-04-01T23:59:59.000Z

185

E-Print Network 3.0 - atmospheric pollutants levels Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Dispersion a. Maximum ground-level ambient concentration b... Pollution Prevention, Control and Sustainability Instructor: V.M. Fthenakis, Tel: (212) 854-8885, Email: vmf......

186

The importance of invertebrates when considering the impacts of anthropogenic noise  

Science Journals Connector (OSTI)

...while shipping, recreational boating, seismic exploration, sonar and pile-driving...globally rising underwater sound levels on fish. Trends Ecol. Evol. 25, 419-427...interference: impact of acoustic noise on seismic communication and mating success. Behav...

2014-01-01T23:59:59.000Z

187

Noise and vibration characteristics of cleanroom fan filter units  

Science Journals Connector (OSTI)

Fan filter units (FFU’s) are used increasingly by the microelectronics industry to provide recirculation air in cleanrooms. Such units usually consist of one or more direct?drive blowers located in a small discharge plenum and a HEPA or ULPA filter. There may be several hundred FFU’s in a large cleanroom. The noise and vibration generated by FFU’s differ greatly between manufacturers. Since it is difficult to apply external noise and vibration mitigation it is important to select an FFU model with appropriate noise and vibration levels so that a cleanroom served by these units will meet the prespecified noise and vibration criteria. Unfortunately FFU manufacturers usually do not provide enough information for predicting the FFU generated sound?pressure spectrum or vibration in a cleanroom. In this paper simple noise and vibration measurement methods will be described which can be used as a basis for specifying FFU performance without special testing facilities. Measured data will be presented for a number of units. Procedures will be demonstrated to predict the performance of a cleanroom which uses FFU’s as the primary source of recirculation air.

Mei Q. Wu; Colin G. Gordon

1998-01-01T23:59:59.000Z

188

Noise?insulation requirements for multi?family dwellings  

Science Journals Connector (OSTI)

Noise insulation standards are part of the California Administrative Code (Title 25 Section 1092). These standards apply to all new multi?family dwelling units such as hotels apartments duplexes townhouses and condominium units. Detached single?family dwellings are specifically excluded. The standards establish minimum requirements for the isolation of interior spaces from exterior noise and set minimum ratings for noise insulation of partitions between dwelling units. A community noise equivalent level (CNEL) of 45 dB is set as the maximum for intrusive noise from exterior sources such as rail or road traffic or aircraft operations. American Society for Testing and Materials (ASTM) testing procedures for party wall and floor/ceiling system sound transmission provide the basis for setting minimum acceptable performance for separations between units. As a consultant to builders planners and architects the site planning and design of residential projects have been examined and field evaluations have been performed on completed projects. Building designs and the selection of suitable building elements (wall construction composites window assemblies vent configurations etc.) which assure compliance with the standards have been identified. The paper provides a brief description of the standards their enforcement pitfalls and an assessment of their impact on residential construction in California.

John J. Van Houten

1981-01-01T23:59:59.000Z

189

Simulation of synchrotron motion with rf noise  

SciTech Connect

The theoretical formulation is described that is behind an algorithm for synchrotron phase-space tracking with rf noise and some preliminary simulation results of bunch diffusion under rf noise obtained by actual tracking.

Leemann, B.T.; Forest, E.; Chattopadhyay, S.

1986-08-01T23:59:59.000Z

190

Power supply noise in delay testing  

E-Print Network (OSTI)

As technology scales into the Deep Sub-Micron (DSM) regime, circuit designs have become more and more sensitive to power supply noise. Excessive noise can significantly affect the timing performance of DSM designs and cause non-trivial additional...

Wang, Jing

2009-05-15T23:59:59.000Z

191

Sensing Applications of Fluctuations and Noise  

E-Print Network (OSTI)

Noise and time-dependent fluctuations are usually undesirable signals. However, they have many applications. This dissertation deals with two kinds of sensing applications of fluctuation and noise: soil bulk density assessment and bacterium sensing...

Chang, Hung-Chih

2011-02-22T23:59:59.000Z

192

Effects of Weapon Noise on Hearing  

Science Journals Connector (OSTI)

...“In military spheres, the need for prevention of weapon noise-induced hearing loss is receiving ever-...

A. Dancer; R. Franke

1986-01-01T23:59:59.000Z

193

Noise Compensation for Subspace Gaussian Mixture Models  

E-Print Network (OSTI)

Noise Compensation for Subspace Gaussian Mixture Models Liang Lu University of Edinburgh Joint work condition (i.e. noise), the gain disappears Goal Noise compensation for SGMM Method Model space compensation . . .· · · · · · · · · · ·· · ·· · ···· · ·· · ·· vjk Liang Lu, Interspeech, September, 2012 R T S C R T S C #12;Noise compensation Larger modelling

Edinburgh, University of

194

Ambient Air Quality Standards (New Jersey) | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Ambient Air Quality Standards (New Jersey) Ambient Air Quality Standards (New Jersey) Ambient Air Quality Standards (New Jersey) < Back Eligibility Agricultural Commercial Construction Fed. Government Fuel Distributor General Public/Consumer Industrial Installer/Contractor Institutional Investor-Owned Utility Local Government Low-Income Residential Multi-Family Residential Municipal/Public Utility Nonprofit Residential Retail Supplier Rural Electric Cooperative Schools State/Provincial Govt Systems Integrator Transportation Tribal Government Utility Program Info State New Jersey Program Type Siting and Permitting Provider State of New Jersey Department of Environmental Protection This article lists specific standards for ambient air quality standards for particulate matter, sulfur dioxide, carbon monoxide, ozone, lead and

195

Chapter 53 Ambient Air Quality (Kentucky) | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

3 Ambient Air Quality (Kentucky) 3 Ambient Air Quality (Kentucky) Chapter 53 Ambient Air Quality (Kentucky) < Back Eligibility Agricultural Commercial Construction Developer Industrial Installer/Contractor Investor-Owned Utility Municipal/Public Utility Rural Electric Cooperative Utility Program Info State Kentucky Program Type Environmental Regulations Safety and Operational Guidelines Provider Kentucky Department for Environmental Protection Kentucky Administrative Regulation Chapter 53, entitled Ambient Air Quality, is promulgated under the authority of the Division of Air Quality within the Energy and Environment Cabinet's Department for Environmental Protection. Chapter 53 sets the air quality standards for pollutants regulated under the federally mandated Clean Air Act. The purpose of the

196

Sílabo del curso de Ciencia y Medio Ambiente.  

E-Print Network (OSTI)

??Ciencia y medio ambiente es un curso de formación teórico–práctico, orientado a estudiantes de la especialidad de Ingeniería en Sistemas Computacionales. El propósito de la… (more)

[No author

2014-01-01T23:59:59.000Z

197

Ambient Corporation's response to NBP RFI: Communications Requirements...  

Energy Savers (EERE)

by Studying the Communications Requirements of Electric Utilities to Inform Federal Smart Grid Policy Ambient Corporation's response to NBP RFI: Communications Requirements More...

198

Effects of Ambient Density and Temperature on Soot Formation...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

all of the EGR - Intake and TDC charge-gas (ambient) temperature increases. - Shortens ignition delay (prevents low combustion) - Temperature also inherently affects soot...

199

Arauna Energia e Gest o Ambiental | Open Energy Information  

Open Energy Info (EERE)

Sao Paulo, Brazil Zip: 01420-002 Product: Brazilian based project developer and PDD consultant company. References: Arauna Energia e Gesto Ambiental1 This article is a stub....

200

Ambient Ionization Mass Spectrometry Analysis Pertaining To Biofuel Process Development.  

E-Print Network (OSTI)

??Mass spectrometry (MS) has undergone a revolution with the introduction of a new group of desorption/ionization (DI) techniques known collectively as Ambient Ionization mass spectrometry.… (more)

Dendukuri, Sushma

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Noise canceling in-situ detection  

DOE Patents (OSTI)

Technologies applicable to noise canceling in-situ NMR detection and imaging are disclosed. An example noise canceling in-situ NMR detection apparatus may comprise one or more of a static magnetic field generator, an alternating magnetic field generator, an in-situ NMR detection device, an auxiliary noise detection device, and a computer.

Walsh, David O.

2014-08-26T23:59:59.000Z

202

The laser satellites communications and laser noises  

Science Journals Connector (OSTI)

The gain of advanced optical communication systems is reduced by the noise of optical source. Coherent optical communication systems are in particular very sensitive to the noise transmitter and local laser. Optical space communications is on the verge ... Keywords: laser, laser communication, noise limits, optical communication, range loss, satellite communications, satellite systems, signal transfer loss, space channel

Marketa Mazalkova

2008-08-01T23:59:59.000Z

203

Automotive friction-induced noises A. Elmaiana  

E-Print Network (OSTI)

Automotive friction-induced noises A. Elmaiana , J.-M. Duffala , F. Gautiera , C. Pezeratb and J, France 3143 #12;Friction-induced noises are numerous in the automotive field. They also involve a large friction-induced noises with simple structures and automotive materials. Qualitative sensitivity studies

Paris-Sud XI, Université de

204

Charge Noise in Graphene Transistors Iddo Heller,,  

E-Print Network (OSTI)

Charge Noise in Graphene Transistors Iddo Heller,,§ Sohail Chatoor, Jaan Ma¨nnik, Marcel A. G an experimental study of 1/f noise in liquid-gated graphene transistors. We show that the gate dependence to the graphene, while at high carrier density it is consistent with noise due to scattering in the channel

Dekker, Cees

205

Adaptive mean filtering for noise reduction in CT polymer gel dosimetry  

SciTech Connect

X-ray computed tomography (CT) as a method of extracting 3D dose information from irradiated polymer gel dosimeters is showing potential as a practical means to implement gel dosimetry in a radiation therapy clinic. However, the response of CT contrast to dose is weak and noise reduction is critical in order to achieve adequate dose resolutions with this method. Phantom design and CT imaging technique have both been shown to decrease image noise. In addition, image postprocessing using noise reduction filtering techniques have been proposed. This work evaluates in detail the use of the adaptive mean filter for reducing noise in CT gel dosimetry. Filter performance is systematically tested using both synthetic patterns mimicking a range of clinical dose distribution features as well as actual clinical dose distributions. Both low and high signal-to-noise ratio (SNR) situations are examined. For all cases, the effects of filter kernel size and the number of iterations are investigated. Results indicate that adaptive mean filtering is a highly effective tool for noise reduction CT gel dosimetry. The optimum filtering strategy depends on characteristics of the dose distributions and image noise level. For low noise images (SNR {approx}20), the filtered results are excellent and use of adaptive mean filtering is recommended as a standard processing tool. For high noise images (SNR {approx}5) adaptive mean filtering can also produce excellent results, but filtering must be approached with more caution as spatial and dose distortions of the original dose distribution can occur.

Hilts, Michelle; Jirasek, Andrew [Medical Physics, BC Cancer Agency-Vancouver Island Centre, Victoria, British Columbia, V8R6V5 (Canada); Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia, V8W2Y2 (Canada)

2008-01-15T23:59:59.000Z

206

Fossil Biodiversity: Red Noise Plus Signal  

E-Print Network (OSTI)

We have examined the Fourier power spectrum as well as the Hurst exponent of extinction, origination, and total biodiversity in the marine fossil record, using a recently improved geologic timescale. We find all of them strongly inconsistent with past claims of self-similarity as well as inconsistent with random walk behavior. Instead, they are dominated by low-frequency power, with approximate f^-2 power over one decade in frequency. The spectrum turns over at about 10^8 y, lending plausibility to connections with galactic dynamics. Even in the background of this low-frequency dominance, a previously noted 62 My biodiversity cycle stands out with better than 99% confidence above the noise level, accounting for about 35% of the total variance in the fossil biodiversity record.

Adrian L. Melott; Bruce S. Lieberman

2006-06-14T23:59:59.000Z

207

Fossil Biodiversity: Red Noise Plus Signal  

E-Print Network (OSTI)

We have examined the Fourier power spectrum as well as the Hurst exponent of extinction, origination, and total biodiversity in the marine fossil record, using a recently improved geologic timescale. We find all of them strongly inconsistent with past claims of self-similarity as well as inconsistent with random walk behavior. Instead, they are dominated by low-frequency power, with approximate f^-2 power over one decade in frequency. The spectrum turns over at about 10^5 y, lending plausibility to connections with galactic dynamics. Even in the background of this low-frequency dominance, a previously noted 62 My biodiversity cycle stands out with better than 99% confidence above the noise level, accounting for about 35% of the total variance in the fossil biodiversity record.

Melott, A L; Melott, Adrian L.; Lieberman, Bruce S.

2006-01-01T23:59:59.000Z

208

Assessment of annoyance due to wind turbine noise  

Science Journals Connector (OSTI)

The overall aim of this study was to evaluate the perception and annoyance of noise from wind turbines in populated areas of Poland. The study group comprised 156 subjects. All subjects were interviewed using a questionnaire developed to enable evaluation of their living conditions including prevalence of annoyance due to noise from wind turbines and the self-assessment of physical health and wellbeing. In addition current mental health status of respondents was assessed using Goldberg General Health Questionnaire GHQ-12. For areas where respondents lived A-weighted sound pressure levels (SPLs) were calculated as the sum of the contributions from the wind power plants in the specific area. It has been shown that the wind turbine noise at the calculated A-weighted SPL of 30?48 dB was perceived as annoying outdoors by about one third of respondents while indoors by one fifth of them. The proportions of the respondents annoyed by the wind turbine noise increased with increasing A-weighted sound pressure level. Subjects' attitude to wind turbines in general and sensitivity to landscape littering was found to have significant impact on the perceived annoyance. Further studies are needed including a larger number of respondents before firm conclusions can be drawn.

Malgorzata Pawlaczyk-Luszczynska; Kamil Zaborowski; Malgorzata Zamojska; Malgorzata Waszkowska

2013-01-01T23:59:59.000Z

209

Assessment of annoyance due to wind turbine noise  

Science Journals Connector (OSTI)

The overall aim of this study was to evaluate the perception and annoyance of noise from wind turbines in populated areas of Poland. The study group comprised 378 subjects. All subjects were interviewed using a questionnaire developed to enable evaluation of their living conditions including prevalence of annoyance due to noise from wind turbines and the self-assessment of physical health and well-being. In addition current mental health status of respondents was assessed using Goldberg General Health Questionnaire GHQ-12. For areas where respondents lived A-weighted sound pressure levels (SPLs) were calculated as the sum of the contributions from the wind power plants in the specific area. It has been shown that the wind turbine noise at the calculated A-weighted SPL of 30?50 dB was perceived as annoying outdoors by about one third of respondents while indoors by one fifth of them. The proportions of the respondents annoyed by the wind turbine noise increased with increasing A-weighted sound pressure level. Subjects’ attitude to wind turbines in general and sensitivity to landscape littering was found to have significant impact on the perceived annoyance. Further studies are needed including a larger number of respondents before firm conclusions can be drawn.

2013-01-01T23:59:59.000Z

210

Noise suppressing capillary separation system  

DOE Patents (OSTI)

A noise-suppressing capillary separation system for detecting the real-time presence or concentration of an analyte in a sample is provided. The system contains a capillary separation means through which the analyte is moved, a coherent light source that generates a beam which is split into a reference beam and a sample beam that irradiate the capillary, and a detector for detecting the reference beam and the sample beam light that transmits through the capillary. The laser beam is of a wavelength effective to be absorbed by a chromophore in the capillary. The system includes a noise suppressing system to improve performance and accuracy without signal averaging or multiple scans. 13 figs.

Yeung, E.S.; Xue, Y.

1996-07-30T23:59:59.000Z

211

Global Chemical Composition of Ambient Fine Particulate Matter for Exposure Assessment  

Science Journals Connector (OSTI)

This is in line with previous findings of high ambient PM2.5 exposure from biofuel burning(47, 48) and in addition to PM2.5 exposure from household air pollution. ... Cao, J.; Xu, H.; Xu, Q.; Chen, B.; Kan, H.Fine particulate matter constituents and cardiopulmonary mortality in a heavily polluted Chinese city Environ. ... Lahore, Pakistan is an emerging megacity that is heavily polluted with high levels of particle air pollution. ...

Sajeev Philip; Randall V. Martin; Aaron van Donkelaar; Jason Wai-Ho Lo; Yuxuan Wang; Dan Chen; Lin Zhang; Prasad S. Kasibhatla; Siwen Wang; Qiang Zhang; Zifeng Lu; David G. Streets; Shabtai Bittman; Douglas J. Macdonald

2014-10-24T23:59:59.000Z

212

Coating thermal noise for arbitrary shaped beams  

E-Print Network (OSTI)

Advanced LIGO's sensitivity will be limited by coating noise. Though this noise depends on beam shape, and though nongaussian beams are being seriously considered for advanced LIGO, no published analysis exists to compare the quantitative thermal noise improvement alternate beams offer. In this paper, we derive and discuss a simple integral which completely characterizes the dependence of coating thermal noise on shape. The derivation used applies equally well, with minor modifications, to all other forms of thermal noise in the low-frequency limit.

Richard O'Shaughnessy

2006-10-13T23:59:59.000Z

213

NETL: Ambient Monitoring - Characterization of Ambient PM2.5 in the Upper  

NLE Websites -- All DOE Office Websites (Extended Search)

Characterization of Ambient PM2.5 in the Upper Midwest Characterization of Ambient PM2.5 in the Upper Midwest As part of a Cooperative Agreement with DOE-NETL, the University of North Dakota Energy and Environmental Research Center (EERC) is developing advanced sampling and analysis methodologies for particulate matter that can be used for source apportionment and to assist in health studies. These techniques will be used to determine sources of fine particulate matter in rural states such as North Dakota. Ambient particulate matter (PM) sampling and automated scanning electron microscopy, (ASEM) are being used to characterize and evaluate the sources of PM2.5 at three rural sites. Land use in the sampling site locations is dominated by ranching and small grain farming. Potential sources of PM in these areas include diesel- and gasoline-fueled motor vehicles, fugitive dust from gravel roads and agriculture, vegetation and fires, an oil refinery, and coal-fired power plants. PM2.5 samples were collected using an automatic cartridge collection unit for ASEM analysis. An ASEM method has been developed to size and chemically classify individual particles composing PM2.5.

214

Application of barrier in industrial noise control  

Science Journals Connector (OSTI)

Noise barriers have been widely used in environmental noisecontrol such as traffic and railway noise. Actually they are also cost?effective mitigation measures in industrial noise control. In this paper the applications of noise barrier in power plant are introduced. Types of barrier and barrier materials are briefly summarized and compared. A case study of noise barrier implement in a 50 MW power plant is presented. The plant is a natural gas?fired simple?cycle peaking facility and consists of two opposed gas combustion turbine directly connected through a coupling to a single generator. Some residences are located around the facility. A noise barrier wall was designed and installed surrounding the facility to control the noiseimpact of the plant on the residences. The acoustic modeling software Cadna/A was used to predict the noise insertion loss of the barrier. The prediction results were also compared with the site measurements.

2005-01-01T23:59:59.000Z

215

Rural community noise caused by 345/138 kV substation transformer  

Science Journals Connector (OSTI)

Residents 360 m (1200 ft) from a large (6 × 8 × 4.5 m high) 345/138 kV transformer installed in a new power substation in a rural setting complained of its noise emission especially at night. Octave band and 24?h A?weighted noise measurements were made. The 120?Hz sound level was found to be 90 to 105 dB at the transformer surface. Transformer noise emission did not vary significantly with transformer loading or time of day. The distant (360 m) noise level was from 40 to 47 dBA (N?30 to N?45) depending on intervening terrain and time of day. In calm summer air the annoying sound was found to be in the 125?Hz band at the residence beyond a vegitated rise and 250 to 500 Hz for a residence with line?of?sight contact over a shallow depression. The line?of?sight resident's complaint that the noise was greatest at night was corroborated by the 24?h measurement. That noise level was found to be typically 38 dBA from 11 a.m. to 7 p.m. and 45 dBA from 9 p.m. to 6 a.m. It is postulated that the depression accumulated cool air at night thus refracting the sound onto that site. Recommendations for a noise barrier wall was made to the power company operator.

Angelo J. Campanella

1981-01-01T23:59:59.000Z

216

Ambient Atmosphere Ion Thruster (AAIT) Proof-of-Concept Modeling  

E-Print Network (OSTI)

exit velocity, vout,i (from energy conservation) ­ Open grid area, Aopen (from AAIT design) T = mini (AIAA-2006-4650) · Designed for electrostatic acceleration of ambient ions with two biased grids ­ Uses screen grid and accelerator grid to create electric field and accelerate ambient ions · Use on

Walker, Mitchell

217

DoMAIns: Domain-based modeling for Ambient Intelligence  

Science Journals Connector (OSTI)

Ambient Intelligence and Smart Home Automation systems are currently emerging as feasible and ready to exploit solutions to support more intelligent features inside future and current homes. Thanks to increased availability of off-the-shelf components ... Keywords: Ambient Intelligence, Domotic plant, Home Automation, Intelligent Domotic Environment, Modeling, State diagrams

Dario Bonino; Fulvio Corno

2012-08-01T23:59:59.000Z

218

GUA DA SUSTENTABILIDADE ENERXA VICERREITORA DE INFRAESTRUTURAS E XESTIN AMBIENTAL  

E-Print Network (OSTI)

GUÍA DA SUSTENTABILIDADE ­ ENERXÍA VICERREITORÍA DE INFRAESTRUTURAS E XESTI�N AMBIENTAL -A UDC ven enerxética non quedando atrás na carreira da persecución da sustentabilidade ambiental, económica e social

Fraguela, Basilio B.

219

Extracting Key Factors to Design Applications in Ambient Intelligence Environment  

Science Journals Connector (OSTI)

In an ambient intelligence environment, the design of applications influences the users behavior heavily. The purpose of this paper is to provide key factors considered necessary in developing those applications. We developed four applications applied ... Keywords: ambient feedback, persuasive technology, behavior modification, emotional engagement

Hiroaki Kimura; Tatsuo Nakajima

2008-12-01T23:59:59.000Z

220

Ambient Corporation's Reply comments to DOE RFI: Addressing Policy and  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Ambient Corporation's Reply comments to DOE RFI: Addressing Policy Ambient Corporation's Reply comments to DOE RFI: Addressing Policy and Logistical Challenges to Smart Grid Implementation Ambient Corporation's Reply comments to DOE RFI: Addressing Policy and Logistical Challenges to Smart Grid Implementation Ambient Corporation submits the following comments to the US Department of Energy (DOE) in hopes that their contribution can highlight and further the understanding of the DOE on the key role that integrated communications will play ineneabling utilities to deploy cost-effective long-term smart grid benefits. Ambient Corporation's Reply comments to DOE RFI: Addressing Policy and Logistical Challenges to Smart Grid Implementation More Documents & Publications Comments of Tendril Networks Inc Technical Standards Newsletter - September 2001

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Ambient Air Quality Standards (New Mexico) | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Ambient Air Quality Standards (New Mexico) Ambient Air Quality Standards (New Mexico) Ambient Air Quality Standards (New Mexico) < Back Eligibility Agricultural Commercial Construction Developer Industrial Investor-Owned Utility Municipal/Public Utility Rural Electric Cooperative State/Provincial Govt Utility Program Info Start Date 11/30/1995 State New Mexico Program Type Environmental Regulations Provider New Mexico Environment Department This regulation establishes ambient air quality standards for the areas of New Mexico under the jurisdiction of the Environmental Improvement Board. The maximum allowable concentrations of total suspended particulate in the ambient air are as follows: 24-hour average: 150 ug/m3; 7-day average: 110 ug/m3; 30-day average: 90 ug/m3; Annual geometric mean: 60 ug/m3. The maximum allowable concentrations of sulfur-containing

222

PREPARATIVOS EN MARCHA PARA LA CONFERENCIA SOBRE JUSTICIA AMBIENTAL  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

PREPARATIVOS EN MARCHA PARA LA CONFERENCIA SOBRE JUSTICIA AMBIENTAL PREPARATIVOS EN MARCHA PARA LA CONFERENCIA SOBRE JUSTICIA AMBIENTAL NACIONAL Y EL PROGRAMA DE CAPACITACIÓN 2014 PREPARATIVOS EN MARCHA PARA LA CONFERENCIA SOBRE JUSTICIA AMBIENTAL NACIONAL Y EL PROGRAMA DE CAPACITACIÓN 2014 La conferencia regresa a D.C. del 26 al 28 de marzo de 2014 con la celebración de los 20 años de justicia ambiental pasados y futuros. PREPARATIVOS EN MARCHA PARA LA CONFERENCIA SOBRE JUSTICIA AMBIENTAL NACIONAL Y EL PROGRAMA DE CAPACITACIÓN 2014 More Documents & Publications SE HAN FINALIZADO LOS PREPARATIVOS PARA LA CONFERENCIA NACIONAL DE JUSTICIA MEDIOAMBIENTAL Y PROGRAMA DE FORMACIÓN 2013 2013 National Environmental Justice Conference and Training Program EIS-0281: Draft Environmental Impact Statement Summary (Spanish)

223

Ising-Glauber Spin Cluster Model for Temperature-Dependent Magnetization Noise in SQUIDs  

Science Journals Connector (OSTI)

Clusters of interacting two-level-systems, likely due to Farbe+(F+) centers at the metal-insulator interface, are shown to self-consistently lead to 1/f? magnetization noise [with ?(T)?1] in SQUIDs. Model calculations, based on a new method of obtaining correlation functions, explains various puzzling experimental features. It is shown why the inductance noise is inherently temperature dependent while the flux noise is not, despite the same underlying microscopics. Magnetic ordering in these systems, established by three-point correlation functions, explains the observed flux- inductance-noise cross correlations. Since long-range ferromagnetic interactions are shown to lead to a more weakly temperature dependent flux noise when compared to short-range interactions, the time reversal symmetry of the clusters is also not likely broken by the same mechanism which mediates surface ferromagnetism in nanoparticles and thin films of the same insulator materials.

Amrit De

2014-11-18T23:59:59.000Z

224

Using ADCP Background Sound Levels to Estimate Wind Speed  

Science Journals Connector (OSTI)

It is well known that ambient sound is generated by wind through the process of wave breaking and bubble injection. The resulting sound levels are highly correlated with wind speed and, even though the physical process is not fully understood, ...

Len Zedel

2001-11-01T23:59:59.000Z

225

Shot Noise in Ballistic Graphene  

Science Journals Connector (OSTI)

We have investigated shot noise in graphene field effect devices in the temperature range of 4.2–30 K at low frequency (f=600–850??MHz). We find that for our graphene samples with a large width over length ratio W/L, the Fano factor F reaches a maximum F?1/3 at the Dirac point and that it decreases strongly with increasing charge density. For smaller W/L, the Fano factor at Dirac point is significantly lower. Our results are in good agreement with the theory describing that transport at the Dirac point in clean graphene arises from evanescent electronic states.

R. Danneau; F. Wu; M. F. Craciun; S. Russo; M. Y. Tomi; J. Salmilehto; A. F. Morpurgo; P. J. Hakonen

2008-05-13T23:59:59.000Z

226

Optimum information in crackling noise  

Science Journals Connector (OSTI)

The crackling noise due to scratching superhard nanocomposite coatings was investigated by using a simple stick-slip model. The optimum information extracted from statistical analysis, in terms of the Akaike information criterion, is in good agreement with real tests. As a nanocomposite coating approaches an optimal performance, the acoustic emission energy follows a power-law distribution and its behavior is likely to be independent of microscopic and macroscopic details. The results imply that a peculiar deformation behavior, due to the competition between different deformation mechanisms such as dislocation pileups in nanocrystalline grains and grain sliding-grain rotation within amorphous boundaries, plays a vital role in the nanostructure with superhardness.

Chunsheng Lu; Yiu-Wing Mai; Yao-Gen Shen

2005-08-08T23:59:59.000Z

227

Signal processing method and system for noise removal and signal extraction  

DOE Patents (OSTI)

A signal processing method and system combining smooth level wavelet pre-processing together with artificial neural networks all in the wavelet domain for signal denoising and extraction. Upon receiving a signal corrupted with noise, an n-level decomposition of the signal is performed using a discrete wavelet transform to produce a smooth component and a rough component for each decomposition level. The n.sup.th level smooth component is then inputted into a corresponding neural network pre-trained to filter out noise in that component by pattern recognition in the wavelet domain. Additional rough components, beginning at the highest level, may also be retained and inputted into corresponding neural networks pre-trained to filter out noise in those components also by pattern recognition in the wavelet domain. In any case, an inverse discrete wavelet transform is performed on the combined output from all the neural networks to recover a clean signal back in the time domain.

Fu, Chi Yung (San Francisco, CA); Petrich, Loren (Lebanon, OR)

2009-04-14T23:59:59.000Z

228

Designing petrochemical plants to permit retrofitting of any additional controls needed to meet community noise limits.  

Science Journals Connector (OSTI)

Designing petrochemical power or industrial plants to meet community noise limits can be expensive. To meet stringent limits incremental costs often exceed one million dollars per decibel. There is considerable uncertainty including: overly conservative or unrepresentative vendor noise data limitations of ray?tracing software questionable accuracy beyond 1000 m lack of TL and absorption data below 125 Hz unreliable IL data for pipe lagging at all frequencies unexpected operating conditions and vendors not meeting their equipment noise limits. Atmospheric effects can cause variations of A?weighted community noise levels of 25 dB at 100 m from a refinery which can make meeting a not?to?exceed noise limit difficult and risky. Further lack of experience with noise control of any participant (noise controlengineer project owner regulators or vendors) can substantially increase uncertainty. Including sufficient noise controls to cover these uncertainties will be expensive often overly conservative and often unnecessarily expensive. One way to substantially lower costs and risks is designing the plant to permit delaying some but not all controls until start?up—if needed. This paper describes the planning needed to permit a partial reliance on retrofit controls what type of controls can be delayed until start?up and space allocation. Examples are included.

2009-01-01T23:59:59.000Z

229

Social survey of the annoyance of low?frequency aircraft ground noise  

Science Journals Connector (OSTI)

Concerns about the appropriateness of representing low?frequency aircraft ground and near?ground noise in A?weighted units and about the adequacy of standard interpretive criteria for assessing community response to low?frequency noises are becoming more common at large civil airports. Residents of a neighborhood adjacent to a busy runway were interviewed to determine the annoyance of runway sideline noise at frequencies below 100 Hz and of its audible manifestations inside homes. Extensive measurements were made to estimate low?frequency noise contours in the interviewing area and street addresses of respondents were geo?coded to permit assignment of low?frequency noise levels to each household. Residents who were highly annoyed by low?frequency sideline noise were concentrated in areas with maximum sound levels summed in one?third octave bands between 25 and 80 Hz (inclusive) that were in excess of 75–80 dB. These levels are consistent with Hubbard’s (1980) estimates of low?frequency airborne sound levels capable of inducing secondary emissions in light architectural elements of residences.

S. Fidell; L. Silvati; S. Lind; K. Pearsons

1999-01-01T23:59:59.000Z

230

Study on the annoyance of high frequency noise at industrial workstations  

Science Journals Connector (OSTI)

The aim of the study was subjective assessment of the acoustic environment of persons exposed to high frequency noise at workstations. The study based on the survey regarding the annoyance of this type of noise which was conducted among 52 operators of equipment for the production of platform gratings. The study covered workstations where acoustic measurements confirmed the presence of high frequency noise (in the frequency range from 10 to 20 kHz). During work at these workstations the value of the equivalent sound pressure level in one-third octave-bands center frequencies of 10 12.5 and 16 kHz occurs within the range of 81–103 dB and exceeds the admissible value defined for these frequency bands. The results of the study indicated that 92% of respondents are exposed to noise the whole time of the shift. All respondents wear hearing protection. Most of the employees describe the noise as: buzzing insistent high-pitched squeaky and whistling. Respondents unanimously consider related noise levels as: loud impeding communication highly strenuous and tiring. The highest number of points on a scale corresponding to noise annoyance was achieved by terms: horrible very persistently and firmly.

2013-01-01T23:59:59.000Z

231

Spatial distribution of very low?frequency wind?generated noise in the ocean  

Science Journals Connector (OSTI)

We have adapted our model of surface?generated noise in a stratified lossy ocean to the case of low?frequency wind?generated noise produced in deep water by turbulentpressure fluctuations in the atmosphere. The model assumes a random pressure distribution at the surface and includes the effects of sound?speed profile and bottom characteristics. Using Wilson's source levels [J. H. Wilson J. Acoust. Soc. Am. 66 1499–1507 (1979)] we have calculated the noise level as functions of frequency and depth and compared the results with measured data. We show these results along with calculations of the spatial coherence function which differs significantly from the standard deep?water result. Finally we present calculations of the effective surface area that is the area of the surface centered above the receiver which contributes most of the noise intensity. We show that this quantity is dependent on receiver depth.

F. Ingenito; W. A. Kuperman

1980-01-01T23:59:59.000Z

232

Controlling combustion noise in direct injection diesel engine through mechanical vibration measurement  

Science Journals Connector (OSTI)

The next generations of direct injection diesel engines have greatly improved their performances compared with petrol engines. However, one of the pending subjects is the noise and vibration levels, due to working cycle itself. The design effort to reduce the emissions of noise and vibration transmitted to the vehicle's driver could be lessened because of the assembly process variation. In this paper, a procedure to control this variation has been suggested in order to maintain noise and vibration performances within the limits of design.

J.A. Calvo; V. Diaz; J.L. San Roman

2005-01-01T23:59:59.000Z

233

E-Print Network 3.0 - ambient condition effects Sample Search...  

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P b in a:P : P... Secure Safe Ambients Michele Bugliesi Universita "Ca' Foscari", Venice michele... Ambients (SSA) are a typed variant of Safe Ambients 9, whose type...

234

E-Print Network 3.0 - ambient sound measurements Sample Search...  

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Summary of CHI '98, April 18-23, 1998, 1998 ACM 1 ambientROOM: Integrating Ambient Media Summary: of the weather outside from ambient cues such as light, temperature, sound,...

235

Effects of Tidal Turbine Noise on Fish Task 2.1.3.2: Effects on Aquatic Organisms: Acoustics/Noise - Fiscal Year 2011 - Progress Report - Environmental Effects of Marine and Hydrokinetic Energy  

SciTech Connect

Naturally spawning stocks of Chinook salmon (Oncorhynchus tshawytscha) that utilize Puget Sound are listed as threatened (http://www.nwr.noaa.gov/ESA-Salmon-Listings/Salmon-Populations/ Chinook/CKPUG.cfm). Plans exist for prototype tidal turbines to be deployed into their habitat. Noise is known to affect fish in many ways, such as causing a threshold shift in auditory sensitivity or tissue damage. The characteristics of noise, its spectra and level, are important factors that influence the potential for the noise to injure fish. For example, the frequency range of the tidal turbine noise includes the audiogram (frequency range of hearing) of most fish. This study (Effects on Aquatic Organisms, Subtask 2.1.3.2: Acoustics) was performed during FY 2011 to determine if noise generated by a 6-m-diameter open-hydro turbine might affect juvenile Chinook salmon hearing or cause barotrauma. After they were exposed to simulated tidal turbine noise, the hearing of juvenile Chinook salmon was measured and necropsies performed to check for tissue damage. Experimental groups were (1) noise exposed, (2) control (the same handling as treatment fish but without exposure to tidal turbine noise), and (3) baseline (never handled). Preliminary results indicate that low levels of tissue damage may have occurred but that there were no effects of noise exposure on the auditory systems of the test fish.

Halvorsen, Michele B.; Carlson, Thomas J.; Copping, Andrea E.

2011-09-30T23:59:59.000Z

236

Noise Pollution Control (Minnesota) | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Noise Pollution Control (Minnesota) Noise Pollution Control (Minnesota) Noise Pollution Control (Minnesota) < Back Eligibility Utility Fed. Government Commercial Agricultural Investor-Owned Utility State/Provincial Govt Industrial Construction Municipal/Public Utility Local Government Residential Installer/Contractor Rural Electric Cooperative Tribal Government Low-Income Residential Schools Retail Supplier Institutional Multi-Family Residential Systems Integrator Fuel Distributor Nonprofit General Public/Consumer Transportation Savings Category Alternative Fuel Vehicles Hydrogen & Fuel Cells Buying & Making Electricity Water Home Weatherization Solar Wind Program Info State Minnesota Program Type Environmental Regulations These regulations set noise standards and direct municipalities to take reasonable measures to prevent the establishment of land use activities

237

How Can Random Noise Help Us  

E-Print Network (OSTI)

How Can Random Noise Help Us. Global Transports from Thermal Fluctuations. Aaron N. K. Yip. Department of Mathematics. Purdue University. 0. 1. 2. 3. 4. 5. 6.

2009-03-18T23:59:59.000Z

238

Determination of the accuracy of noise dosimeters used for the evaluation of occupational noise exposure  

E-Print Network (OSTI)

DETERMINATION OF THE ACCURACY OF NOISE DOSIMETERS USED FOR THE EVALUATION OF OCCUPATIONAL NOISE EXPOSURE A Thesis by ROBF. RT DALTON ABEL, JR. Submitted to the Graduate College of Texas ASM University in oartial fulfillment of...' the requirement for the degree of. MASTER OF SCIENCE May 1977 Ma. jor Subject: Industrial Hygiene DETERMINATION OF THE ACCURACY OF NOISE DOSIMETERS USED FOR THE EVALUATION OF OCCUPATIONAL NOISE EXPOSURE A Thesis by ROBERT DALTON ABEL, JR. Approved...

Abel, Robert Dalton

2012-06-07T23:59:59.000Z

239

E-Print Network 3.0 - ambient air toxics Sample Search Results  

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Indicators Project; CDC, NCEH, EHHE; January 2006 7 Summary: pollutants in ambient air Hazardous or toxic substances released in ambient air Residence in non... Indicators...

240

Development of an ambient lighting monitoring system for radiological image viewing application  

Science Journals Connector (OSTI)

Ambient lighting plays a very important role in radiological image viewing environment. Excessive room ambient lighting (or illuminance) degrades image contrast, introducing veiling glare, diffuse reflectivity...

Ahmad Azlan Che; K. H. Ng; N. F. Mohd. Nasir…

2007-01-01T23:59:59.000Z

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241

E-Print Network 3.0 - ambient pressure estimation Sample Search...  

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at ambient pressure. That is confirmed from the transition temperature TN vs pressure phase... was observed at ambient pressure 6. Along with the data indicating relatively...

242

E-Print Network 3.0 - ambiente termoneutro dos Sample Search...  

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de Algs, 42 SL 1495 Algs , +351 1 4120772... Filipareis@yahoo.com Susana B. SANTOS Eng do Ambiente, Direco Geral de Energia, Diviso de Energia e... Ambiente...

243

E-Print Network 3.0 - ambiental caso cundinamarca Sample Search...  

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stesso insieme di Summary: residui organici animali atmosfera ambiente En. chimica Luce solare terreno O2 12;12;Quantum genetics... si adatta all'ambiente circostante per...

244

E-Print Network 3.0 - ambiental dos recursos Sample Search Results  

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Information Sciences 17 MAESTRA EN DESARROLLO Y AMBIENTE Objetivo del programa Summary: recursos naturales renovables 3 Poltica y legislacin ambiental 3 Fundamentos de...

245

E-Print Network 3.0 - ambient high temperature Sample Search...  

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metabolism in relation to ambient temperature in mice Summary: to compensate for elevated heat loss, while at high ambient temperatures metabolic rates should be low to avoid......

246

E-Print Network 3.0 - ambiente controlado para Sample Search...  

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y su realizacin. 9 La Secretara de Medio Ambiente, Recursos Naturales y Pesca... PEMEX y con la colaboracin de la Agencia para la Proteccin Ambiental (EPA, por sus...

247

E-Print Network 3.0 - ambient particulate matter Sample Search...  

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ambient particulate matter Page: << < 1 2 3 4 5 > >> 1 Statistical Issues in the Study of Air Pollution Involving Airborne Particulate Matter Summary: Ambient Air Quality Standards...

248

E-Print Network 3.0 - ambient air exposures Sample Search Results  

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source-specific population exposure to ambient urban air... -specific exposure to ambient air pollution for an entire urbanpopulation at a fine geographical scale. Byarea, total......

249

Comparison of measurement indices of noise intrusions in multi?family housing  

Science Journals Connector (OSTI)

Methods for measuring sound levels associated with transportation impact and airborne sound intrusions in multi?family housing are well established in the field. This paper compares field testing of assemblies where complaints and retrofits have been involved where traditional assessments of intruding noises showed compliance with design criteria but where residents and/or building owners perceived problems. Case study 1 involves noise from airplanes approaching a runway at a large international airport as heard in an all?glass high?rise condominium evaluated by LDNs and SELs of actual flyovers in computer models and in a full size mock?up of a typical unit built on site. Case study 2 involves noise from outdoor amplified entertainment propagating into neighborhoods as evaluated by various noise ordinance criteria. Case study 3 involves footstep noise through flooring systems comparing IIC ratings with actual sound pressure levels of people walking on floors above. Case study 4 compares noise and vibration levels for various pieces of mechanical equipment before and after retrofit with NC RC and other room criteria. Auralizations of the case studies will be shown along with measurement data to illustrate the diagnostics made in each case.

2006-01-01T23:59:59.000Z

250

NETL: Ambient Monitoring - Contribution of Semi-volatile Organic Material  

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Airborne Particulate Threat Assessment (APTA) Project Airborne Particulate Threat Assessment (APTA) Project In a collaborative effort between ChemImage Biothreat, LLC and the National Energy Technology Laboratory (NETL), the Airborne Particulate Threat Assessment (APTA) Project will acquire the ability to discern between chemical/biological threat agents and ambient background particulate matter (PM) encountered in the environment. The project will focus on potential background interferences, specifically from the ambient backgrounds collected at NETL-supported ambient air collection facilities. Potential substrate interferences such as pollen, insecticides and industrial PM will be addressed. Using Raman Chemical Imaging (RCI) and fluorescence chemical imaging, a background - void of pathogen spores - will be collected and compared to known pathogens. Interactions causing possible false positives will be identified and studied. This study would systematically identify potential problems and provide a baseline of ambient particulates found in the mid-eastern United States .

251

Enhancing Amine-Supported Materials for Ambient Air Capture ...  

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Enhancing Amine-Supported Materials for Ambient Air Capture Previous Next List Julian P. Sculley, Hong-Cai Zhou, Angew. Chem. Int. Ed., 51, 12660-12661 (2012) DOI: 10.1002...

252

Interoperable Semantic & Syntactic Service Matching for Ambient Computing Environments  

E-Print Network (OSTI)

. For service discovery protocols (SDP), one of the main functions of service-oriented architectures (SOA this purpose, the Service- Oriented Architecture (SOA) computing paradigm is particularly appropriate environments. Keywords: Service-oriented ambient computing, service discovery, matching and ranking

Paris-Sud XI, Université de

253

Legal safeguards for privacy and data protection in ambient intelligence  

Science Journals Connector (OSTI)

To get the maximum benefit from ambient intelligence (AmI), we need to anticipate and react to possible drawbacks and threats emerging from the new technologies in order to devise appropriate safeguards. The SWAM...

Paul De Hert; Serge Gutwirth; Anna Moscibroda…

2009-08-01T23:59:59.000Z

254

Street media : ambient messages in an urban space  

E-Print Network (OSTI)

Ambient street media are the media of our everyday lives in cities. Manifested in bits and fragments on the surfaces of the streetscape, these media often escape our notice - tuned out as visual clutter or dismissed as ...

Murthy, Rekha (Rekha S.)

2005-01-01T23:59:59.000Z

255

PREPARATIVOS EN MARCHA PARA LA CONFERENCIA SOBRE JUSTICIA AMBIENTAL...  

Energy Savers (EERE)

NACIONAL Y EL PROGRAMA DE CAPACITACIN 2014 La conferencia regresa a D.C. del 26 al 28 de marzo de 2014 con la celebracin de los 20 aos de justicia ambiental pasados y...

256

Modeling of recurrent threshold crossings due to noise with long memory  

E-Print Network (OSTI)

? of the signal by an additive Gaussian noise which optimizes the SNR at the output of a stochastic resonator. Using a simple Level Crossing Detector (LCD) which is a stochastic resonator without internal dynamics, we are able to achieve a maximum at the output... of the LCD for a particular level of input noise. The LCD works in such a way that a short uniform spike is initiated at its output whenever the voltage at its input goes through a given voltage level, the threshold voltage, in the increasing direction...

Singh, Abhishek Narayan

2007-04-25T23:59:59.000Z

257

NoiseSPY: A Real-Time Mobile Phone Platform for Urban Noise Monitoring and Mapping  

Science Journals Connector (OSTI)

In this paper we present the design, implementation, evaluation, and user experiences of the NoiseSpy application, our sound sensing system that turns the mobile phone into a low-cost data logger for monitoring environmental noise. It allows users to ... Keywords: mobile computing, noise mapping, online mapping, pervasive sensing, pollution monitoring, ubiquitous computing.

Eiman Kanjo

2010-08-01T23:59:59.000Z

258

Reliability of electrochemical noise measurements: results of round-robin testing on electrochemical noise  

E-Print Network (OSTI)

1 Reliability of electrochemical noise measurements: results of round-robin testing on electrochemical noise Rik-Wouter BOSCHa , Robert A. COTTISb,* , Kinga CSECSc , Thomas DORSCHc , Lucia DUNBARd), Switzerland; p) University of Cadiz, Spain. Abstract Sixteen laboratories have performed electrochemical noise

259

Distribution of ions in cochlear tissues: Effects of noise exposure  

Science Journals Connector (OSTI)

To assess the role of altered ion distribution in noise?induced hearing loss the element content of isolated outer hair cells (OHCs) stria vascularis and spiral ligament was studied utilizing the energy dispersive X?ray analysis (EDXA) mode of the scanning electron microscope. In the normal chinchilla inner ear EDXA spectra from non?nuclear regions of OHCs showed high levels of Cl and K with relatively low P S and Na. OHC nuclei were similar but with high P. In contrast both non?nuclear and nuclear regions of stria vascularis were characterized by high P and K with Cl and Na significantly lower than in OHCs. The element content of the spiral ligament varied in a regular manner with the location sampled. Exposure to a two?octave (1414–5656 Hz) band of noise for 1 h at intensities from 90? to 120?dB SPL had no effect upon the element content of stria. OHC spectra were also unchanged in intact cells. Degenerating cells showed elevated Cl and K levels. The results suggest that changes in the ionic content of OHCs and stria vascularis are not involved in the temporary effects of noise. However altered ion distribution does appear to be associated with the degeneration of OHCs after intense sound exposure.

Allen Ryan; M. Gary Wickham; Robert C. Bone

1978-01-01T23:59:59.000Z

260

CO2 Capture by Sub-Ambient Membrane Operation  

NLE Websites -- All DOE Office Websites (Extended Search)

by Sub-Ambient Membrane by Sub-Ambient Membrane Operation Background The mission of the U.S. Department of Energy/National Energy Technology Laboratory (DOE/NETL) Existing Plants, Emissions & Capture (EPEC) Research & Development (R&D) Program is to develop innovative environmental control technologies to enable full use of the nation's vast coal reserves, while at the same time allowing the current fleet of coal-fired power plants to comply with existing

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Ambient noise surface wave tomography to determine the shallow shear velocity structure at Valhall: depth inversion with a Neighbourhood Algorithm  

Science Journals Connector (OSTI)

......dispersion. 4.3 Construction of a hybrid model Adding a single additional...inversion results. Therefore, a final hybrid 3-D model is constructed only...resources provided by the European Grid Infrastructure. For more information, please......

A. Mordret; M. Landès; N. M. Shapiro; S. C. Singh; P. Roux

2014-01-01T23:59:59.000Z

262

GEOCHEMISTRY, GEOPHYSICS, GEOSYSTEMS, VOL. ???, XXXX, DOI:10.1029/, The influence of non-uniform ambient noise on1  

E-Print Network (OSTI)

, Institute of Geophysics, ETH Zurich, Sonneggstrasse 5, Zurich, Switzerland. T. Nissen-Meyer, Institute of Geophysics, ETH Zurich, Sonneggstrasse 5, Zurich, Switzerland. Olaf Schenk, Institute of Computational of Geophysics, ETH Zurich, Sonneggstrasse 5, Zurich, Switzerland. 3 ISTEP, UMR 7193, UPMC Universite Paris 6

Paris-Sud XI, Université de

263

Surface wave tomography of the western United States from ambient seismic noise: Rayleigh wave group velocity maps  

E-Print Network (OSTI)

, Department of Physics, University of Colorado at Boulder, Campus Box 390, Boulder, Colorado 80309, USA River flood basalts, the Snake River Plain and Yellowstone, and mantle wedge features associated

Ritzwolle, Mike

264

Offshore pile driving noise—Prediction through comprehensive model development  

Science Journals Connector (OSTI)

Offshore wind energy is one of the most potent among renewables and thus the worldwide number of offshore wind turbines increases rapidly. The foundations of the wind turbines are typically fastened to the seabed by impact pile driving which comes along with a significant amount of waterborne noise. To protect the marine biosphere the use of noise mitigation systems like bubble curtains or cofferdams may become necessary. In this context the model-based prediction of underwater sound pressure levels as well as the design and optimization of effective sound mitigation measures by using numerical models is one of today’s challenges. The current work presents a modeling approach that consists of a near field finite element model and a far field propagation model. Furthermore it has been found necessary to generate a benchmark to allow for a qualitative and quantitative comparison between the manifold modeling approaches that are currently developed at various institutes and companies.

Marcel Ruhnau; Stephan Lippert

2013-01-01T23:59:59.000Z

265

Assessing the Impacts of Reduced Noise Operations of Wind Turbines on Neighbor Annoyance: A Preliminary Analysis in Vinalhaven, Maine  

E-Print Network (OSTI)

only self-reported wind and turbine sound levels were used.Noise Operations of Wind Turbines on Neighbor Annoyance: ANoise Operations of Wind Turbines on Neighbor Annoyance: A

Hoen, Ben

2010-01-01T23:59:59.000Z

266

Active noise within the generating/pumping groups of a large hydroelectric plant  

Science Journals Connector (OSTI)

This work is related to a feasibility study for the implementation of an active noise control system to reduce the hydraulic turbomachine’s noise in the Presenzano power plant. Previous studies showed that interested turbines are low frequencies noise sources generating pure tones at 150 and 200 Hz (third and fourth harmonics of the turbine’s BPF). At these frequencies passive noise control systems are ineffective in front of relevant costs and an active approach was so decided to be tested. In accordance with a classical architecture the preliminary system was composed of four error microphones four secondary noise sources and a digital controller implementing an adaptive digital filter. Main performed activities could be identified through four successive steps: (i) analysis of the turbomachine’s generated primary field levels and space distribution (ii) secondary sources generated noise field measurement ten different loudspeakers locations were investigated at this stage; (iii) sensor and actuator locations’ optimization by the use of a genetic algorithm’s procedure and (iv) active noise control tests. A mean reduction of 15 dB at 150 Hz and 7.5 dB at 200 Hz was measured at the error sensors during these tests revealing the good opportunities of such an approach but also the opportune improvement to pass at a practical implementation.

Leonardo Lecce; Massimo Viscardi; Bruno Maja; Vincenzo Limone; Mario D’Ischia; Francesco Di Maso

1999-01-01T23:59:59.000Z

267

Motor vehicle noise emission while accelerating up a hill  

Science Journals Connector (OSTI)

A noise survey was performed in 1975 to determine motor vehiclenoise emissions while accelerating up a grade. A?weighted sound levels were measured at locations 50 ft from urban streets with grades carrying between 4.3% and 9.6%. The recorded sound level data are presented as a function of grade for five classes of vechicles: passenger cars light trucks (GVW: under 8000 lb) light?medium trucks (GVW: 8–14 000 lb) medium trucks (GVW: 14–24 000 lb) and heavy trucks (GVW: over 24 000 lb). Statistical distributions of the recorded sound level data are presented for each class of vehicle and compared to level street acceleration data measured in 1974 [Michael F. Nechvatal and Robert D. Hellweg Jr. J. Acoust. Soc. Am. 56 S34(A) (1974)].

Robert D Hellweg Jr.; Michael F. Nechvatal

1975-01-01T23:59:59.000Z

268

Device-independent quantum reading and noise-assisted quantum transmitters  

E-Print Network (OSTI)

In quantum reading, a quantum state of light (transmitter) is applied to read classical information. In the presence of noise or for sufficiently weak signals, quantum reading can outperform classical reading by enhanced state distinguishability. Here we show that the enhanced quantum efficiency depends on the presence in the transmitter of a particular type of quantum correlations, the discord of response. Different encodings and transmitters give rise to different levels of efficiency. Considering noisy quantum probes we show that squeezed thermal transmitters with non-symmetrically distributed noise among the field modes yield a higher quantum efficiency compared to coherent thermal quantum states. The noise-enhanced quantum advantage is a consequence of the discord of response being a non-decreasing function of increasing thermal noise under constant squeezing, a behavior that leads to an increased state distinguishability. We finally show that, for non-symmetric squeezed thermal states, the probability of error, as measured by the quantum Chernoff bound, vanishes asymptotically with increasing local thermal noise at finite global squeezing. Therefore, at fixed finite squeezing, noisy but strongly discordant quantum states with large noise imbalance between the field modes can outperform noisy classical resources as well as pure entangled transmitters with the same finite level of squeezing.

Wojciech Roga; Daniela Buono; Fabrizio Illuminati

2014-12-22T23:59:59.000Z

269

The new standard’s HVAC background noise requirements and their implementation in building design  

Science Journals Connector (OSTI)

The new ANSI classroom standard recommends long?term steady?state background sound level limits of 35 dBA and 55 dBC. Since the HVAC system is typically a room’s dominant steady?state noise source it is usually reasonable to apply these limits to the design of the system assuming that other noise sources produce insignificant additions to the room’s long?term background noise environment. The recommended sound level limits are significantly lower than current industry standards and complying with them will increase system costs. School administrators architects and HVAC system designers should therefore be prepared for the changes. This paper summarizes equipment selection and system design guidelines that have been found to be necessary for ensuring compliance with the sound level limits.

2001-01-01T23:59:59.000Z

270

Low noise charge ramp electrometer  

DOE Patents (OSTI)

An electrometer capable of measuring small currents without the use of a feedback resistor which tends to contribute a large noise factor to the measured data. The electrometer eliminates the feedback resistor through the use of a feedback capacitor located across the electrometer amplifier. The signal from the electrometer amplifier is transferred to a electrometer buffer amplifier which serves to transfer the signal to several receptors. If the electrometer amplifier is approaching saturation, the buffer amplifier signals a reset discriminator which energizes a coil whose magnetic field closes a magnetic relay switch which in turn resets or zeros the feedback capacitor. In turn, a reset complete discriminator restarts the measurement process when the electrometer amplifier approaches its initial condition. The buffer amplifier also transmits the voltage signal from the electrometer amplifier to a voltage-to-frequency converter. The signals from the voltage-to-frequency converter are counted over a fixed period of time and the information is relayed to a data processor. The timing and sequencing of the small current measuring system is under the control of a sequence control logic unit. 2 figs.

Morgan, J.P.; Piper, T.C.

1992-10-06T23:59:59.000Z

271

Application of Noise Cancelling and Damage Detection Algorithms in NDE of Concrete Bridge Decks Using Impact Signals  

SciTech Connect

Delamination is a commonly observed distress in concrete bridge decks. Among all the delamination detection methods, acoustic methods have the advantages of being fast and inexpensive. In traditional acoustic inspection methods, the inspector drags a chain along or hammers on the bridge deck and detects delamination from the 'hollowness' of the sounds. The signals are often contaminated by ambient traffic noise and the detection of delamination is highly subjective. This paper describes the performance of an impact-bases acoustic NDE method where the traffic noise was filtered by employing a noise cancelling algorithm and where subjectivity was eliminated by introducing feature extraction and pattern recognition algorithms. Different algorithms were compared and the best one was selected in each category. The comparison showed that the modified independent component analysis (ICA) algorithm was most effective in cancelling the traffic noise and features consisting of mel-frequency cepstral coefficients (MFCCs) had the best performance in terms of repeatability and separabillty. The condition of the bridge deck was then detected by a radial basis function (RBF) neural network. The performance of the system was evaluated using both experimental and field data. The results show that the selected algorithms increase the noise robustness of acoustic methods and perform satisfactorily if the training data is representative.

Zhang, Gang; Harichandran, Ronald S.; Ramuhalli, Pradeep

2011-09-13T23:59:59.000Z

272

E-Print Network 3.0 - ambient vibration tests Sample Search Results  

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tests Search Powered by Explorit Topic List Advanced Search Sample search results for: ambient vibration tests...

273

E-Print Network 3.0 - ambient vibration test Sample Search Results  

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test Search Powered by Explorit Topic List Advanced Search Sample search results for: ambient vibration test...

274

E-Print Network 3.0 - ambient air pollution Sample Search Results  

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pollution Search Powered by Explorit Topic List Advanced Search Sample search results for: ambient air pollution...

275

Coherence and anticoherence resonance tuned by noise  

Science Journals Connector (OSTI)

We present numerical evidence and a theoretical analysis of the appearance of anticoherence resonance induced by noise, not predicted in former analysis of coherence resonance. We have found that this phenomenon occurs for very small values of the intensity of the noise acting on an excitable system, and we claim that this is a universal signature of a nonmonotonous relaxational behavior near its oscillatory regime. Moreover, we demonstrate that this new phenomenon is totally compatible with the standard situation of coherence resonance appearing at intermediate values of noise intensity.

A. M. Lacasta; F. Sagués; J. M. Sancho

2002-10-24T23:59:59.000Z

276

Low-noise macroscopic twin beams  

E-Print Network (OSTI)

Applying a multiphoton-subtraction technique to two-color macroscopic squeezed vacuum state of light generated via high-gain parametric down conversion we conditionally prepare a new state of light: bright multi-mode low-noise twin beams. The obtained results demonstrate up to 8-fold suppression of noise in each beam while preserving and even moderately improving the nonclassical photon number correlations between the beams. The prepared low-noise macroscopic state, containing up to 2000 photons per mode, is not among the states achievable through nonlinear optical processes. The proposed technique substantially improves the usefulness of twin beams for quantum technologies.

Timur Sh. Iskhakov; Vladyslav C. Usenko; Radim Filip; Maria V. Chekhova; Gerd Leuchs

2014-08-27T23:59:59.000Z

277

A programmable analog Gaussian noise generator for test applications.  

E-Print Network (OSTI)

??This thesis presents a robust programmable analog Gaussian noise generator suitable for mixed-signal test applications. Unlike conventional methods, noise generators employing a linear feedback shift… (more)

Aouini, Sadok.

2006-01-01T23:59:59.000Z

278

Improved Prediction of Runway Usage for Noise Forecast :.  

E-Print Network (OSTI)

??The research deals with improved prediction of runway usage for noise forecast. Since the accuracy of the noise forecast depends on the robustness of runway… (more)

Dhanasekaran, D.

2014-01-01T23:59:59.000Z

279

Military noise limits: Design criteria versus operational effectiveness  

Science Journals Connector (OSTI)

Noise requirements in military environments differ significantly from typical industrial or occupational situations. Both in combat and in training mission success requires offensive equipment and weapons to be more lethal and survivable than those used by the adversary. Higher muzzle velocities heavier projectiles and more powerful engines result in high levels of both steady-state and impulsive noise and an increased risk of hearing loss for the users. Weapons firing can expose the user to more energy in a single event than typically experienced in a working lifetime of occupational exposure. In addition military operations require effective speech communication while minimizing auditory detection of equipment by the adversary. Producing material suitable for various forms of military operations requires unique design criteria often exceeding civilian national or international standards. To meet these unique and often contradicting requirements the U.S. military developed a military design standard for noise limits. This standard (MIL-STD-1474) was last revised in 1997. This paper describes the effort of the U.S. Army Navy and Air Force to update the standard to permit production and fielding of military systems designed to maximize Warfighter effectiveness while minimizing hearing damage caused by their use.

2014-01-01T23:59:59.000Z

280

Realizing strong light-matter interactions between single nanoparticle plasmons and molecular excitons at ambient conditions  

E-Print Network (OSTI)

Realizing strong light-matter interactions between individual 2-level systems and resonating cavities in atomic and solid state systems opens up possibilities to study optical nonlinearities on a single photon level, which can be useful for future quantum information processing networks. However, these efforts have been hampered by the unfavorable experimental conditions, such as cryogenic temperatures and ultrahigh vacuum, required to study such systems and phenomena. Although several attempts to realize strong light-matter interactions at room-temperature using so-called plasmon resonances have been made, successful realizations on the single nanoparticle level are still lacking. Here, we demonstrate strong coupling between plasmons confined within a single silver nanoprism and excitons in molecular J-aggregates at ambient conditions. Our findings show that the deep subwavelength mode volumes, $V$, together with high quality factors, $Q$, associated with plasmons in the nanoprisms result in strong coupling ...

Zengin, Gülis; Nilsson, Sara; Antosiewicz, Tomasz J; Käll, Mikael; Shegai, Timur

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Ambient Radon-222 Monitoring in Amargosa Valley, Nevada  

SciTech Connect

As part of a program to characterize and baseline selected environmental parameters in the region around the proposed repository at Yucca Mountain, Nevada, ambient radon-222 monitoring was conducted in the rural community of Amargosa Valley, the community closest to the proposed repository site. Passive integrating radon monitors and a continuous radon monitoring instrument were deployed adjacent to the Community Environmental Monitoring Program (CEMP) (http://www.cemp.dri.edu/index.html) station located in the Amargosa Valley Community Center near the library. The CEMP station provided real-time ambient gamma exposure and meteorological data used to correct the integrated radon measurements as well as verify meteorological data collected by the continuous radon monitoring instrument. Additionally, different types of environmental enclosures that housed the monitors and instrument were used to determine if particular designs influenced the ambient radon measurements.

L.H. Karr; J.J. Tappen; D. Shafer; K.J. Gray

2008-06-05T23:59:59.000Z

282

NASA Subsonic Jet Transport Noise Reduction Research  

Science Journals Connector (OSTI)

Although new jet transport airplanes in today''s fleet are considerably quieter than the first jet transports introduced about 40 years ago, airport community noise continues to be an important environmental issue. NASA''s Advanced Subsonic Transport ...

Powell Clemans A.; Preisser John S.

2000-08-01T23:59:59.000Z

283

Information and noise in quantum measurement  

Science Journals Connector (OSTI)

Even though measurement results obtained in the real world are generally both noisy and continuous, quantum measurement theory tends to emphasize the ideal limit of perfect precision and quantized measurement results. In this article, a more general concept of noisy measurements is applied to investigate the role of quantum noise in the measurement process. In particular, it is shown that the effects of quantum noise can be separated from the effects of information obtained in the measurement. However, quantum noise is required to “cover up” negative probabilities arising as the quantum limit is approached. These negative probabilities represent fundamental quantum-mechanical correlations between the measured variable and the variables affected by quantum noise.

Holger F. Hofmann

2000-07-06T23:59:59.000Z

284

Numerical evaluation of propeller noise, including non-linear effects  

E-Print Network (OSTI)

. Typically, the acoustic field of a propeller consists of high noise levels concentrated at discrete individual frequencies. For many oi' the advanced propeller designs such as the propfan, which are designed to oper ate at tip speeds well int o... into the flow by the blades, the acoustic field is dependent on the physical flow field. It is therefor e essential to completely deter mine the flow over the individual blades as well as their combined effect on the flow around the propeller configuration...

White, Terence Alan

2012-06-07T23:59:59.000Z

285

Quantum capacity of channel with thermal noise  

E-Print Network (OSTI)

The quantum capacity of thermal noise channel is studied. The extremal input state is obtained at the postulation that the coherent information is convex or concave at its vicinity. When the input energy tends to infinitive, it is verified by perturbation theory that the coherent information reaches its maximum at the product of identical thermal state input. The quantum capacity is obtained for lower noise channel and it is equal the one shot capacity.

Xiao-yu Chen

2006-02-11T23:59:59.000Z

286

Characterization of CdZnTe ambient temperature detectors  

SciTech Connect

A great deal of interest has been generated in the use of cadmium telluride (CdTe) and cadmium zinc telluride (CdZnTe) detectors for ambient temperature detection of radionuclides. The addition of zinc to CdTe provides several benefits that enhance the materials operational characteristics at ambient temperature. Recent movement in the industry is to produce larger volume detectors using CdZnTe without much known about the effects of larger geometry on performance. The purpose of this study is to get an idea of the relationship of detector performance to both area and thickness variations.

Lavietes, A.

1994-09-01T23:59:59.000Z

287

Prediction of noise emissions from industrial flares  

Science Journals Connector (OSTI)

In many industries where combustible waste gases are obtained flares are used to burn these gases in a controlled manner. Among other environmental aspects the noise emissions associated with flaring are becoming increasingly important in many countries as population density goes up and residential and industrial areas move closer together. Installing noise control equipment on flares is almost impossible while they are in service since flares are typically a safety related plant component that can only be turned off after the connected plant has been shut down. Accordingly in order to plan appropriate noise controlmeasures in time and to avoid unnecessary costs predicting the noise emissions of flares as early in the design process as possible is crucial. This requires knowledge of the relevant individual noise sources associated to the flare system and the ability to calculate their respective contribution ? in the operating condition in question ? to the overall noise emission based on the data available in the planning stage. The present paper summarizes these sources and outlines some of the individual effects and parameters having an influence on the acoustical characteristics of flares.

Carl?Christian Hantschk; Edwin Schorer

2008-01-01T23:59:59.000Z

288

Excess optical quantum noise in atomic sensors  

E-Print Network (OSTI)

Enhanced nonlinear optical response of a coherent atomic medium is the basis for many atomic sensors, and their performance is ultimately limited by the quantum fluctuations of the optical read-out. Here we demonstrate that off-resonant interactions can significantly modify the quantum noise of the optical field, even when their effect on the mean signal is negligible. We illustrate this concept by using an atomic magnetometer based on the nonlinear Faraday effect: the rotation of the light polarization is mainly determined by the resonant light-induced spin alignment, which alone does not change the photon statistics of the optical probe. Yet, we found that the minimum noise of output polarization rotation measurements is above the expected shot noise limit. This excess quantum noise is due to off-resonant coupling and grows with atomic density. We also show that the detection scheme can be modified to reduce the measured quantum noise (even below the shot-noise limit) but only at the expense of the reduced rotational sensitivity. These results show the existence of previously unnoticed factors in fundamental limitations in atomic magnetometry and could have impacts in many other atom-light based precision measurements.

Irina Novikova; Eugeniy E. Mikhailov; Yanhong Xiao

2014-10-14T23:59:59.000Z

289

Dynamical Decoupling and Dephasing in Interacting Two-Level Systems  

E-Print Network (OSTI)

We implement dynamical decoupling techniques to mitigate noise and enhance the lifetime of an entangled state that is formed in a superconducting flux qubit coupled to a microscopic two-level system. By rapidly changing ...

Bylander, Jonas

290

E-Print Network 3.0 - ambient radioactivity levels Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

THE DEMOLITION SITE Summary: WM'05 Conference, February 27 - March 3, 2005, Tucson, AZ WM- 5278 1 IDENTIFYING RADIOACTIVE... States Environmental Protection Agency ABSTRACT...

291

Water Use Efficiency in Plant Growth and Ambient Carbon Dioxide Level  

E-Print Network (OSTI)

and carbon dioxide balance of plant leaves was made in the form of a computer program based upon known physiological facts. It predicts significant increases in water use efficiency by plants as CO is enriched, the size of the increase depending upon...

van Bavel, C. H. M.

292

Behavioral responses of wild beluga whales (Delphinapterus leucas) to noise from oil drilling  

Science Journals Connector (OSTI)

Two seasons of field observations and playback experiments with southwest Alaskan beluga whales has established that wild whales in their natural habitat respond more negatively to sudden changes in sound level than to sustained sounds. Recordings of noise from SEDCO 708 drilling platform were projected underwater at 163 dB re: ?Pa source level. Whales less than 1.5 km from the source usually reacted to onset of the noise by swimming away. In two instances groups of whales that were at least 3.5 km from the noise source when playback started continued to approach. One group approached within 300 m before all or part turned back. The other group submerged and passed within 15 m of the projector. Results were consistent with observations of captive belugas.

Frank T. Awbrey; Brent S. Stewart

1983-01-01T23:59:59.000Z

293

A Numerical Treatment of the Rf SQUID: I. General Properties andNoise Energy  

SciTech Connect

We investigate the characteristics and noise performance of rf Superconducting Quantum Interference Devices (SQUIDs) by solving the corresponding Langevin equations numerically and optimizing the model parameters with respect to noise energy. After introducing the basic concepts of the numerical simulations, we give a detailed discussion of the performance of the SQUID as a function of all relevant parameters. The best performance is obtained in the crossover region between the dispersive and dissipative regimes, characterized by an inductance parameter {beta}{prime}{sub L} {triple_bond} 2{pi}LI{sub 0}/{Phi}{sub 0} {approx} 1; L is the loop inductance, I{sub 0} the critical current of the Josephson junction, and {phi}{sub 0} the flux quantum. In this regime, which is not well explored by previous analytical approaches, the lowest (intrinsic) values of noise energy are a factor of about 2 above previous estimates based on analytical approaches. However, several other analytical predictions, such as the inverse proportionality of the noise energy on the tank circuit quality factor and the square of the coupling coefficient between the tank circuit and the SQUID loop, could not be well reproduced. The optimized intrinsic noise energy of the rf SQUID is superior to that of the dc SQUID at all temperatures. Although for technologically achievable parameters this advantage shrinks, particularly at low thermal fluctuation levels, we give an example for realistic parameters that leads to a noise energy comparable to that of the dc SQUID even in this regime.

Kleiner, Reinhold; Koelle, Dieter; Clarke, John

2007-01-15T23:59:59.000Z

294

Artificial neural networks in bias dependant noise modeling of MESFETs  

Science Journals Connector (OSTI)

An efficient procedure for accurate noise parameter prediction of microwave MESFETs / HEMTs for various bias conditions is proposed in this paper. It is based on an improved Pospieszalski's noise model. The bias dependences of the noise model elements ... Keywords: MESFET, artificial neural network, bias, noise modeling

Zlatica Marinkovic; Olivera Pronic-Ran?ic; Vera Markovic

2009-08-01T23:59:59.000Z

295

Guia para a Avaliao do Risco Ambiental de Organismos  

E-Print Network (OSTI)

Paulo - ILSI Brasil 2012 #12;#12;Guia para a Avaliação do Risco Ambiental de Organismos Geneticamente Modificados #12;APOIO: © 2012 ILSI Brasil - International Life Sciences Institute do Brasil ILSI BRASIL INTERNATIONAL LIFE SCIENCES INSTITUTE DO BRASIL Rua Hungria, 664 - conj.113 01455-904 - São Paulo - SP - Brasil

Parrott, Wayne

296

Ambient Sampling/Ionization Mass Spectrometry: Applications and Current Trends  

Science Journals Connector (OSTI)

drugs of abuse ... We felt that because ambient techniques are still young, fundamental studies are still critically needed to understand the range of applications that can be enabled by their use. ... The detection of counterfeit drugs is of particular interest since it is a growing issue in developing countries and over the Internet. ...

Glenn A. Harris; Asiri S. Galhena; Facundo M. Fernández

2011-04-15T23:59:59.000Z

297

Introduzione Matlab Carla Guerrini 1 Introduzione all'ambiente  

E-Print Network (OSTI)

1 Introduzione Matlab Carla Guerrini 1 Introduzione all'ambiente Matlab Introduzione Matlab Carla. Pareschi, Matlab concetti e progetti, Apogeo ed. · Tutorials e programmi disponibili in rete: http:// www.dti.supsi.ch/~bucher/matlab.pdf http://www.dm.unibo.it/ /~guerrini/html/matlab.html http:// www.dm.unibo.it/ /~guerrini

Guerrini, Carla

298

Inter-organization cooperation for ambient assisted living  

Science Journals Connector (OSTI)

In the last years we have witnessed to a substantial increase on the number of people in need of care services, especially among the elderly, a phenomenon related to population ageing. However, this is becoming not exclusive of the elderly, as diseases ... Keywords: Ambient Intelligence, Inter-organization cooperation, e-Health, monitoring, simulation

Paulo Novais; Ricardo Costa; Davide Carneiro; José Neves

2010-04-01T23:59:59.000Z

299

Powering Wireless Sensor Nodes with Ambient Temperature Changes  

E-Print Network (OSTI)

.25 ambient temperature change. Author Keywords Sensing, Thermal energy harvesting, battery-free sensors. ACM to consider power harvesting as a potential solution. In this paper, we present a thermal power harvester in battery technology. Power harvesting provides an alternative solution for developing sensors that can last

Manchak, John

300

Monitoria para FIS1012 Aspectos Fsicos para o Conforto Ambiental  

E-Print Network (OSTI)

Monitoria para FIS1012 Aspectos Físicos para o Conforto Ambiental (disciplina do currículo de das cartas de recomendação encontram-se em: http://www.fis.puc-rio.br/formularios.php os documentos podem ser entregues impressos na sala L 652 ou enviados eletronicamente para monitoria@fis.puc-rio.br Os

Lewiner, Thomas (Thomas Lewiner)

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Distributed interface bits: dynamic dialogue composition from ambient computing resources  

Science Journals Connector (OSTI)

This paper discusses a particular issue in the context of disappearing computing, namely, user mobility. Mobile users may carry with them a variety of wireless gadgets while being immersed in a physical environment encompassing numerous computing devices. ... Keywords: Abstract dialogue elements, Adaptive interaction, Ambient dialogues, Dynamic user interface composition, Wearable interfaces

Anthony Savidis; Constantine Stephanidis

2005-05-01T23:59:59.000Z

302

Visible Light Communications (VLC) for Ambient Assisted Living  

Science Journals Connector (OSTI)

With the advent of high efficacy light emitting diode directional lamps as a key component in focal lighting, new possibilities emerge for re-designing the smart home scenario. A smart home scenario is characterized by enabled intelligent interworking ... Keywords: Ambient lighting, High connectivity, LED, Low rate, PD, VLC

Ambuj Kumar, Albena Mihovska, Sofoklis Kyriazakos, Ramjee Prasad

2014-10-01T23:59:59.000Z

303

Underwater noise generated by Columbia River hydroelectric dams  

Science Journals Connector (OSTI)

Low?frequency (10–1000 Hz) underwater noise measurements have been made in water within and upstream from four Columbia River hydroelectric dams. The motivation for these measurements was to map out the sound field within and upstream from the power dams as a first step in understanding the effect of this field on the behavior of migrating salmonids that must choose between the bypass system or intakes to the turbines. Eventually sound may be used to guide the juvenile fish safely past the turbine intakes and into the bypass system. Thus far single hydrophonemeasurements have been made in the bypass slots within the dam and at a number of locations upstream from the dam. The noise level varies with location decreasing as the hydrophone is moved upsteam from the dam and as the hydrophone is moved closer to the water surface immediately upstream of the dam as well as in the bypass slot. The noise spectra below 200 Hz are highly modulated displaying one or more sharp peaks which indicates resonances in the structural generating mechanism or propagation path. The spectrum level and modulation vary significantly from one dam to another and sometimes from one configuration to another (e.g. when one of the turbines is on or off). A final set of measurements will be made at the Bonneville Dam using several hydrophones placed at a number of locations in the vicinity of the intake channel and these may help identify sources and propagation paths to the hydrophone. [Work sponsored by U. S. Army Corps of Engineers.

Robert T. Miyamoto; Steven O. McConnell; James J. Anderson; Blake E. Feist

1989-01-01T23:59:59.000Z

304

Seismic noise emission induced by seismic waves  

Science Journals Connector (OSTI)

......development of the oil field and injection of...ambient acoustic field with increasing frequency...within the depleted oil reservoir. To exclude...surroundings and then the production of a high-frequency...100-200 Hz with the cumulative time of vibrations...assistance in conducting field experiments. We......

N. K. Privalovskiy; I. A. Beresnev

1994-03-01T23:59:59.000Z

305

Functional link artificial neural network applied to active noise control of a mixture of tonal and chaotic noise  

Science Journals Connector (OSTI)

Many practical noises emanating from rotating machines with blades generate a mixture of tonal and the chaotic noise. The tonal component is related to the rotational speed of the machine and the chaotic component is related to the interaction of the ... Keywords: Active noise control (ANC), Chaotic noise, Functional link artificial neural network (FLANN), Hybrid ANC, Narrowband ANC

Santosh Kumar Behera, Debi Prasad Das, Bidyadhar Subudhi

2014-10-01T23:59:59.000Z

306

Is the equal energy rule applicable to impact noise?  

Science Journals Connector (OSTI)

The equal energy rule (EER) is a theoretical framework for evaluating the acoustic trauma associated with a wide variety of noise exposures. Most of the data supporting the EER have been large scale demographic studies. Controlled laboratory studies especially with impulse noise have brought into question the generality and validity of the EER. The present study assessed the hearing loss resulting from three impactnoise exposures having equal energy but different peak levels (107 113 119 dB SPL) and repetition rates (4/s 1/s 1/4s). Hearing loss was assessed at 0.5 2 and 8 kHz in three groups of chinchillas using the auditory evoked response. The animals were exposed for five days and developed an asymptotic threshold shift (ATS) during the exposure. The animals however did not develop the same amounts of ATS for each exposure as predicted by the EER; instead the hearing loss increased with peak level at the rate between 0.6 and 1 dB ATS/dB peak SPL. [Work supported by NIOSH.

Don Henderson; Richard Salvi; Roger P. Hamernik

1982-01-01T23:59:59.000Z

307

Implications of CT noise and artifacts for quantitative {sup 99m}Tc SPECT/CT imaging  

SciTech Connect

Purpose: This paper evaluates the effects of computed tomography (CT) image noise and artifacts on quantitative single-photon emission computed-tomography (SPECT) imaging, with the aim of establishing an appropriate range of CT acquisition parameters for low-dose protocols with respect to accurate SPECT attenuation correction (AC). Methods: SPECT images of two geometric and one anthropomorphic phantom were reconstructed iteratively using CT scans acquired at a range of dose levels (CTDI{sub vol} = 0.4 to 46 mGy). Resultant SPECT image quality was evaluated by comparing mean signal, background noise, and artifacts to SPECT images reconstructed using the highest dose CT for AC. Noise injection was performed on linear-attenuation (?) maps to determine the CT noise threshold for accurate AC. Results: High levels of CT noise (? ? 200–400 HU) resulted in low ?-maps noise (? ? 1%–3%). Noise levels greater than ?10% in 140 keV ?-maps were required to produce visibly perceptible increases of ?15% in {sup 99m}Tc SPECT images. These noise levels would be achieved at low CT dose levels (CTDI{sub vol} = 4 ?Gy) that are over 2 orders of magnitude lower than the minimum dose for diagnostic CT scanners. CT noise could also lower (bias) the expected ? values. The relative error in reconstructed SPECT signal trended linearly with the relative shift in ?. SPECT signal was, on average, underestimated in regions corresponding with beam-hardening artifacts in CT images. Any process that has the potential to change the CT number of a region by ?100 HU (e.g., misregistration between CT images and SPECT images due to motion, the presence of contrast in CT images) could introduce errors in ?{sub 140} {sub keV} on the order of 10%, that in turn, could introduce errors on the order of ?10% into the reconstructed {sup 99m}Tc SPECT image. Conclusions: The impact of CT noise on SPECT noise was demonstrated to be negligible for clinically achievable CT parameters. Because CT dose levels that affect SPECT quantification is low (CTDI{sub vol} ? 4 ?Gy), the low dose limit for the CT exam as part of SPECT/CT will be guided by CT image quality requirements for anatomical localization and artifact reduction. A CT technique with higher kVp in combination with lower mAs is recommended when low-dose CT images are used for AC to minimize beam-hardening artifacts.

Hulme, K. W.; Kappadath, S. C., E-mail: skappadath@mdanderson.org [Department of Imaging Physics, The University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030 and The University of Texas Graduate School of Biomedical Sciences, Houston, Texas 77030 (United States)

2014-04-15T23:59:59.000Z

308

The room noise criteria (RNC) metric.  

Science Journals Connector (OSTI)

The recent ANSI S12.2:2008 room noise criteria contains both a survey and an engineering method to specify room noise criteria. The methods use A?weighting and extended NC respectively. A new metric titled like the standard room noise criteria (RNC) is included as a diagnostic tool. It is based on human hearing and more correctly assesses low?frequency sound. In particular it is sensitive to the standard deviation to random noise and/or low?frequency surging in the 16–125 Hz octave bands such as the sound that can be produced by HVAC systems or other devices. It provides a bridge between the NC and RC criteria by correctly predicting the need for the less stringent (at low frequencies) NC criteria when the HVAC system is well designed (no surging moderate standard deviation) and also correctly predicting the more stringent (at low frequencies) RC criteria when the HVAC system noise has a large standard deviation and/or surging.

2009-01-01T23:59:59.000Z

309

Flux noise in high-temperature superconductors  

Science Journals Connector (OSTI)

Spontaneously created vortex-antivortex pairs are the predominant source of flux noise in high-temperature superconductors. In principle, flux noise measurements allow to check theoretical predictions for both the distribution of vortex-pair sizes and for the vortex diffusivity. In this paper the flux-noise power spectrum is calculated for the highly anisotropic high-temperature superconductor Bi2Sr2CaCu2O8+?, both for bulk crystals and for ultrathin films. The spectrum is basically given by the Fourier transform of the temporal magnetic-field correlation function. We start from a Berezinskii-Kosterlitz-Thouless-type theory and incorporate vortex diffusion, intrapair vortex interaction, and annihilation of pairs by means of a Fokker-Planck equation to determine the noise spectrum below and above the superconducting transition temperature. We find white noise at low frequencies ? and a spectrum proportional to 1/?3/2 at high frequencies. The crossover frequency between these regimes strongly depends on temperature. The results are compared with earlier results of computer simulations.

Carsten Timm

1997-02-01T23:59:59.000Z

310

Experimental determination of neutron lifetimes through macroscopic neutron noise in the IPEN/MB-01 reactor  

SciTech Connect

The neutron lifetimes of the core, reflector, and global were experimentally obtained through macroscopic neutron noise in the IPEN/MB-01 reactor for five levels of subcriticality. The theoretical Auto Power Spectral Densities were derived by point kinetic equations taking the reflector effect into account, and one of the approaches consider an additional group of delayed neutrons.

Gonnelli, Eduardo; Diniz, Ricardo [Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP Travessa R-400, 05508-900, Cidade Universitaria, Sao Paulo (Brazil)

2013-05-06T23:59:59.000Z

311

Behavioral Simulation Techniques for Substrate Noise Analysis in PLL Jae Wook Kim  

E-Print Network (OSTI)

@gloworm.stanford.edu Abstract- This paper presents a methodology to simulate, at the system level, the substrate noise coupling. The simulation of PLLs requires transient analysis with small time-steps over long intervals in order to achieve to simulate the system in a coarse but fast way in order to gain initial design guidance. For example, speed

Dutton, Robert W.

312

Molecular Studies of Surfaces under Reaction Conditions; Sum Frequency Generation Vibrational Spectroscopy, Scanning Tunneling Microscopy and Ambient Pressure X-Ray Photoelectron Spectroscopy  

SciTech Connect

Instruments developed in our laboratory permit the atomic and molecular level study of NPs under reaction conditions (SFG, ambient pressure XPS and high pressure STM). These studies indicate continuous restructuring of the metal substrate and the adsorbate molecules, changes of oxidation states with NP size and surface composition variations of bimetallic NPs with changes of reactant molecules.

Somorjai, G.A.

2009-11-11T23:59:59.000Z

313

The emission of electromagnetic radiation from a quantum system interacting with an external noise: A general result  

E-Print Network (OSTI)

We compute the spectrum of emitted radiation by a generic quantum system interacting with an external classic noise. Our motivation is to understand this phenomenon within the framework of collapse models. However the computation is general and applies practically to any situation where a quantum system interacts with a noise. The computation is carried out at a perturbative level. This poses problems concerning the correct way of performing the analysis, as repeatedly discussed in the literature. We will clarify also this issue.

S. Donadi; A. Bassi

2014-08-12T23:59:59.000Z

314

KdV Preserves White Noise  

E-Print Network (OSTI)

It is shown that white noise is an invariant measure for the Korteweg-deVries equation on $\\mathbb T$. This is a consequence of recent results of Kappeler and Topalov establishing the well-posedness of the equation on appropriate negative Sobolev spaces, together with a result of Cambronero and McKean that white noise is the image under the Miura transform (Ricatti map) of the (weighted) Gibbs measure for the modified KdV equation, proven to be invariant for that equation by Bourgain.

Jeremy Quastel; Benedek Valko

2006-11-06T23:59:59.000Z

315

E-Print Network 3.0 - ambientes costeiros tropicais Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

ambientes costeiros tropicais Page: << < 1 2 3 4 5 > >> 1 coleo explorando o ensino o brasil e o meio ambiente antrtico Summary: coleo explorando o ensino 10 volume o brasil e...

316

Effect of ambient light on electronically displayed medical images as measured by luminance-discrimination thresholds  

Science Journals Connector (OSTI)

The effect of ambient light on linearization of gray scales was studied in two experiments by measuring brightness-discrimination thresholds for stimuli as a function of ambient-light...

Rogers, Diane C; Pizer, Stephen M; Johnston, R Eugene

1987-01-01T23:59:59.000Z

317

THE DEVELOPMENT OF NICKEL-FREE AUSTENITIC STAINLESS STEELS FOR AMBIENT AND CRYOGENIC APPLICATIONS  

E-Print Network (OSTI)

STEELS FOR AMBIENT AND CRYOGENIC APPLICATIONS Glen T.U. C. Berkeley, "The Cryogenic Properties of Fe-Mn and Fe-STEELS FOR AMBIENT AND CRYOGENIC APPLICATIONS Glen T.

Haddick, Glen T.

2011-01-01T23:59:59.000Z

318

E-Print Network 3.0 - ambiental considerando inovacoes Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

le linee di tendenza e successivamente importa i dati in ambiente... in ambiente Matlab sia in ambi- ente Excel e conduci l'indagine sul comportamento di questi ... Source:...

319

Reflecting the Revised PM 2.5 National Ambient Air Quality Standard...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Reflecting the Revised PM 2.5 National Ambient Air Quality Standard in NEPA Evaluations Reflecting the Revised PM 2.5 National Ambient Air Quality Standard in NEPA Evaluations This...

320

E-Print Network 3.0 - alternative ambient illumination Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

Technologies and Information Sciences 6 Painting surface characteristics Pierre Poulin Alain Fournier Summary: illumination model using ambient, diffuse and specular...

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

AMBIENT PM2.5 SAMPLING AND ANALYSIS  

SciTech Connect

This interim report summarizes detailed findings and conclusions drawn from evaluations of data obtained from the operation of ambient PM{sub 2.5} speciation sites in a geographical area encompassing southeastern Ohio, western Pennsylvania and northwestern West Virginia. The overall goal of this program, called the Upper Ohio River Valley Project (UORVP), is to better understand the relationship between coal-based power system emissions and ambient air quality in the Upper Ohio River Valley region through the collection of chemically resolved or speciated data. A summary of the sampling activities, sample analyses and the correlation and interpretation of data acquired from February 1999 through March of 2001 are reported. Mass and speciated data from urban and rural sources are compared and seasonal variations in PM{sub 2.5} distribution are also examined. Correlations between meteorological parameters and total PM{sub 2.5} mass are also presented.

Unknown

2002-10-31T23:59:59.000Z

322

AMBIENT PM2.5 SAMPLING AND ANALYSIS  

SciTech Connect

This interim report summarizes detailed findings and conclusions drawn from evaluations of data obtained from the operation of ambient PM{sub 2.5} speciation sites in a geographical area encompassing southeastern Ohio, western Pennsylvania and northwestern West Virginia. The overall goal of this program, called the Upper Ohio River Valley Project (UORVP), is to better understand the relationship between coal-based power system emissions and ambient air quality in the Upper Ohio River Valley region through the collection of chemically resolved or speciated data. A summary of the sampling activities, sample analyses and the correlation and interpretation of data acquired from February 1999 through March of 2001 are reported. Mass and speciated data from urban and rural sources are compared and seasonal variations in PM{sub 2.5} distribution are also examined. Correlations between meteorological parameters and total PM{sub 2.5} mass are also presented.

Unknown

2001-10-31T23:59:59.000Z

323

Crnica: "A horta na cidade" (Primavera Ambiental 2013)  

E-Print Network (OSTI)

Crónica: "A horta na cidade" (Primavera Ambiental 2013) O pasado mércores 10 de abril tivo lugar na con ADEGA. A actividade que leva por título "A horta na cidade" consistiu nunha conferencia a cargo de, Isabel Barrio explicounos os pros e contras dos diferentes tipos de hortas urbanas, dende as máis básicas

Fraguela, Basilio B.

324

Ambient gas effects on the dynamics of laser-produced tin plume expansion  

E-Print Network (OSTI)

Ambient gas effects on the dynamics of laser-produced tin plume expansion S. S. Harilal,a Beau O in the development of an extreme ultraviolet lithographic light source. An ambient gas that is transparent to 13.5 nm and deceleration of plume species, the addition of ambient gas leads to other events such as double peak formation

Tillack, Mark

325

Nanogenerator as an active sensor for vortex capture and ambient wind-velocity detection  

E-Print Network (OSTI)

and mechanical (wind, water flow, vibration, friction and body movement) energies are common in the ambientNanogenerator as an active sensor for vortex capture and ambient wind-velocity detection Rui Zhang principle, ambient wind-speed measurements with the NG are demonstrated. Due to the simple structure, high

Wang, Zhong L.

326

Monitoring a Building Using Deconvolution Interferometry. II: Ambient-Vibration Analysis  

E-Print Network (OSTI)

Monitoring a Building Using Deconvolution Interferometry. II: Ambient- Vibration Analysis by Nori interferometry to ambient-vibration data, instead of using earthquake data, to monitor a building. The time continuity of ambient vibrations is useful for temporal monitoring. We show that, because multiple sources

Snieder, Roel

327

Autoassociative neural networks and noise filtering  

Science Journals Connector (OSTI)

We introduce linear autoassociative neural (AN) network filters for the removal of additive noise from one-dimensional (1-D) time series. The AN network will have a (2M+1)×L×(2M+1) architecture, and for M fixed, we show how to choose ...

J.R. Dorronsoro; V. Lopez; C.S. Cruz; J.A. Siguenza

2003-05-01T23:59:59.000Z

328

Parallel barrier effectiveness, Dulles noise barrier project.  

Science Journals Connector (OSTI)

In an effort to minimize the cost and maximize the effectiveness of highway noise barriers the Federal Highway Administration (FHWA) and a National Pooled Fund Panel (made up of 14 states) funded a field study program on an experimental highway noise barrier. A test barrier was constructed in 1984 at a site at Dulles International Airport in Chantilly Virginia. The study conducted from May 1989 to August 1989 by the U.S. Department of Transportation Research and Special Programs Administration Transportation System Center (U.S. DOT/RSPA/TSC) focused on the use of absorptive treatment and tilting as a means of improving the insertion loss of two parallel highway noise barriers. Measurements were conducted with both controlled moving point sources (trucks) and an artificial fixed?point source (speaker system). Results show (1) the addition of absorptive treatment to the roadside face of two vertical parallel highway noise barriers eliminated multiple reflections and was found to improve the insertion loss (2–6 dB); (2) tilting proved to be an effective alternative to absorptive treatment in eliminating the multiple reflections and subsequent degradation in performance of two vertical reflective barriers; and (3) use of an artificial fixed?point source is not a viable test of barrier effectiveness.

Gregg G. Fleming; Edward J. Rickley

1991-01-01T23:59:59.000Z

329

Participatory noise pollution monitoring using mobile phones  

Science Journals Connector (OSTI)

Noise pollution is a major problem in cities around the world. The current methods to assess it neglect to represent the real exposure experienced by the citizens themselves, and therefore could lead to wrong conclusions and a biased representations. ... Keywords: Environmental policy, Web 2.0, citizen science, mobile phones, participatory sensing, pollution measurement

Nicolas Maisonneuve; Matthias Stevens; Bartek Ochab

2010-04-01T23:59:59.000Z

330

Comparison of the signal-to-noise characteristics of quantum versus thermal ghost imaging  

SciTech Connect

We present a theoretical comparison of the signal-to-noise characteristics of quantum versus thermal ghost imaging. We first calculate the signal-to-noise ratio of each process in terms of its controllable experimental conditions. We show that a key distinction is that a thermal ghost image always resides on top of a large background; the fluctuations in this background constitutes an intrinsic noise source for thermal ghost imaging. In contrast, there is a negligible intrinsic background to a quantum ghost image. However, for practical reasons involving achievable illumination levels, acquisition times for thermal ghost images are often much shorter than those for quantum ghost images. We provide quantitative predictions for the conditions under which each process provides superior performance. Our conclusion is that each process can provide useful functionality, although under complementary conditions.

O'Sullivan, Malcolm N.; Chan, Kam Wai Clifford; Boyd, Robert W. [Institute of Optics, University of Rochester, Rochester, New York 14627 (United States)

2010-11-15T23:59:59.000Z

331

Elimination of structure?borne noise using an insulating material made from recycled rubber  

Science Journals Connector (OSTI)

A brief overview of the concept of structure?borne noise will be given from both a theoretical and practical perspective. The methods and materials used to insulate several types of structures against vibrations and the resulting structure?borne noise will be explained. A case study approach will be used to demonstrate the results of these installations. The results will be indicated in the appropriate format including the preceding and resulting sound pressure levels. The background technical data will be presented including the spring characteristics of the materials the natural frequency the dynamic stiffness and the dynamic modulus of elasticity in dependence of the load. The behavior of the materials under load and at removal of load as well as the effect of layering materials will be examined. The required calculations to permit acoustical engineers to solve structure?borne noise problems will be illustrated.

2000-01-01T23:59:59.000Z

332

A neutron noise-based experiment in a TRIGA reactor  

Science Journals Connector (OSTI)

A neutron noise-based experiment performed in the TRIGA reactor of the ENEA-Casaccia centre in Italy is presented. This experiment is part of the first phase of the international TRADE programme that seeks a global demonstration of an accelerator-driven system at power. The main objective of that first experimental phase is the measurement at zero-power of fundamental neutronic parameters. The present experiment performed in the reference critical core configuration has first of all aimed at the inference of the prompt neutron decay constant at critical, which is equal to the ratio of the delayed neutron fraction to the neutron generation time. The neutron-noise technique that has been applied is the power spectral density technique, based on the use of fission chambers operated in fluctuation mode. Two fission chambers, each with a sensitivity of 10-1 cps/nv, have been placed within the core region close to the reflector. The prompt neutron decay constant at delayed critical has been estimated at 132 ± 2 s-1 with 68% confidence level.

Christian Jammes; Benoit Geslot; Philippe Fougeras; Roberto Rosa; George R. Imel

2006-01-01T23:59:59.000Z

333

Ocean acoustic noise budgets: Application to the environmental assessment of offshore wind power generation.  

Science Journals Connector (OSTI)

A noise budget is a listing of the various sources of acoustic noise and their associated ranking by importance. A number of different types of budgets can be conceived using various acoustic measures such as intensity energy or duration of maximum amplitude level. These budgets are typically parameterized by frequency and are usually computed over 1/3 octave bands. As part of the environmental assessment of the proposed offshore wind powergeneration project under the Rhode Island Special Area Management Plan (SAMP) noise measurements were made using the Passive Acoustic Listener (PAL) systems off the coast of Rhode Island prior to the installation of any wind power facilities. Two PALs were deployed within two miles of Block Island in water depths of 20 m from October 6 to November 11 2008. The data included noise spectra and source identification every 3 min. Short snapshots of unusual sounds were also recorded. From this data the ocean acoustic noise budget is computed with contributions from shipping wind/waves marine mammals and rain from 500 Hz to 50 kHz. The shipnoise data is correlated with ship traffic data from the Automatic Identification System (AIS). [Funding provided by the Rhode Island Office of Energy Resources.

2009-01-01T23:59:59.000Z

334

Long range propagation modeling of offshore wind turbine noise using finite element and parabolic equation models  

Science Journals Connector (OSTI)

Noise generated by offshore wind turbines and support structures radiates and propagates through the air water and sediment. Predicting noise levels around wind turbine structures at sea is required to estimate the effects of the noise on marine life. We used Finite Element(FE) and Parabolic Equation (PE) models to predict long range propagation of noise from the construction and operation of offshore wind turbines.FEanalysis produced pressure outputs at short ranges were used as a starting field for a modified PE propagation model. Furthermore we investigated the optimum range for the transition to PE modeling. The effects of various sediment types were also considered determining the pressure starting field. In FEanalysis models we implemented the axisymmetric elements and implicit dynamic analysis with pressureimpact loading and vertical acceleration boundary conditions to simulate pile driving and operational noise radiation. We will present the PE long range pressure field outputs from the offshore pile driving and operation for a shallow water environment around Block Island Rhode Island.

Huikwan Kim; Gopu R. Potty; James H. Miller; Kevin B. Smith; Georges Dossot

2012-01-01T23:59:59.000Z

335

Active noise control of supersonic impinging jet using pulsed microjets  

E-Print Network (OSTI)

This thesis concerns an active noise control of supersonic impinging jet flow using unsteady microjet injection. Supersonic impinging jet involves several problems such as lift loss, ground erosion, significant noise ...

Hong, Seung Hyuck

2009-01-01T23:59:59.000Z

336

Effects of Tidal Turbine Noise on Fish Hearing and Tissues - Draft Final Report - Environmental Effects of Marine and Hydrokinetic Energy  

SciTech Connect

Snohomish Public Utility District No.1 plans to deploy two 6 meter OpenHydro tidal turbines in Admiralty Inlet in Puget Sound, under a FERC pilot permitting process. Regulators and stakeholders have raised questions about the potential effect of noise from the turbines on marine life. Noise in the aquatic environment is known to be a stressor to many types of aquatic life, including marine mammals, fish and birds. Marine mammals and birds are exceptionally difficult to work with for technical and regulatory reasons. Fish have been used as surrogates for other aquatic organisms as they have similar auditory structures. This project was funded under the FY09 Funding Opportunity Announcement (FOA) to Snohomish PUD, in partnership with the University of Washington - Northwest National Marine Renewable Energy Center, the Sea Mammal Research Unit, and Pacific Northwest National Laboratory. The results of this study will inform the larger research project outcomes. Proposed tidal turbine deployments in coastal waters are likely to propagate noise into nearby waters, potentially causing stress to native organisms. For this set of experiments, juvenile Chinook salmon (Oncorhynchus tshawytscha) were used as the experimental model. Plans exist for prototype tidal turbines to be deployed into their habitat. Noise is known to affect fish in many ways, such as causing a threshold shift in auditory sensitivity or tissue damage. The characteristics of noise, its spectra and level, are important factors that influence the potential for the noise to injure fish. For example, the frequency range of the tidal turbine noise includes the audiogram (frequency range of hearing) of most fish. This study was performed during FY 2011 to determine if noise generated by a 6-m diameter OpenHydro turbine might affect juvenile Chinook salmon hearing or cause barotrauma. Naturally spawning stocks of Chinook salmon that utilize Puget Sound are listed as threatened (http://www.nwr.noaa.gov/ESA-Salmon-Listings/Salmon-Populations/Chinook/CKPUG.cfm); the fish used in this experiment were hatchery raised and their populations are not in danger of depletion. After they were exposed to simulated tidal turbine noise, the hearing of juvenile Chinook salmon was measured and necropsies performed to check for tissue damage. Experimental groups were (1) noise exposed, (2) control (the same handling as treatment fish but without exposure to tidal turbine noise), and (3) baseline (never handled). Experimental results indicate that non-lethal, low levels of tissue damage may have occurred but that there were no effects of noise exposure on the auditory systems of the test fish.

Halvorsen, Michele B.; Carlson, Thomas J.; Copping, Andrea E.

2011-09-30T23:59:59.000Z

337

Active noise canceling system for mechanically cooled germanium radiation detectors  

DOE Patents (OSTI)

A microphonics noise cancellation system and method for improving the energy resolution for mechanically cooled high-purity Germanium (HPGe) detector systems. A classical adaptive noise canceling digital processing system using an adaptive predictor is used in an MCA to attenuate the microphonics noise source making the system more deployable.

Nelson, Karl Einar; Burks, Morgan T

2014-04-22T23:59:59.000Z

338

MEASURING NOISE CORRELATION FOR IMPROVED VIDEO DENOISING Anil Kokaram  

E-Print Network (OSTI)

, white, noise sources. In practice this is almost always violated by real media. Film grain noise in archived video content, be it consumer digital camera or film orginated. As an example of how window side effect naturally led to the design of spatio-temporal noise reduction filters intro- duced

Tomkins, Andrew

339

Diesel knock noise from combustion phenomenon to perceived signals  

E-Print Network (OSTI)

Diesel knock noise from combustion phenomenon to perceived signals O. Sauvagea , A. Lauracb , M for reducing Diesel knock are modifications of engine parameters used for controlling combustion processes-acoustic properties, throught its noticeable combustion noise (also called "Diesel knock"). Combustion noise generated

Paris-Sud XI, Université de

340

Separating Signal from Noise in Global Warming Bert W. Rust  

E-Print Network (OSTI)

Separating Signal from Noise in Global Warming Bert W. Rust Reprinted from the CD Rust, B. W. (2003) "Separating Signal from Noise in Global Warming," Computing Science and Statistics, 35, 263-277. ­ or ­ Rust, B. W. (2003) "Separating Signal from Noise in Global Warming," Computing Science and Statistics, 35

Rust, Bert W.

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Low frequency noise from MW wind turbines --mechanisms of generation  

E-Print Network (OSTI)

Low frequency noise from MW wind turbines -- mechanisms of generation and its modeling Helge MW wind turbines -- mechanisms of generation and its modeling Department: Department of Wind Energy 3.6MW turbine 12 3.2 Noise as function of wind speed 12 3.3 Noise as function of rotor

342

Our Data, Ourselves: Privacy via Distributed Noise Generation  

E-Print Network (OSTI)

Our Data, Ourselves: Privacy via Distributed Noise Generation Cynthia Dwork1 , Krishnaram of the noise generation is to create a distributed implemen- tation of the privacy-preserving statistical. The generation of Gaussian noise introduces a technique for distributing shares of many unbiased coins with fewer

Chang, Edward Y.

343

Empirical Bayes approach to improve wavelet thresholding for image noise  

E-Print Network (OSTI)

Empirical Bayes approach to improve wavelet thresholding for image noise reduction Maarten Jansen thresholding for image noise reduction Maarten Jansen Adhemar Bultheel Report TW 296, October 1999 Department to improve wavelet thresholding for image noise reduction Maarten Jansen and Adhemar Bultheel Department

Jansen, Maarten

344

Parallel Imaging and Acceleration in the Johnson Noise Dominated Regime  

E-Print Network (OSTI)

Parallel Imaging and Acceleration in the Johnson Noise Dominated Regime Cristen D. LaPierre1 receive coil in the parallel array. At low field, uncorrelated Johnson noise dominates, providing in the Johnson noise dominated regime. With the eight channel array, SENSE acceleration can be implemented

Rosen, Matthew S

345

Titel des Moduls : Geruschbekmpfung/ Noise and Vibration Control  

E-Print Network (OSTI)

Titel des Moduls : Geräuschbekämpfung/ Noise and Vibration Control LP (nach ECTS): 6 Interne Kurzbe) Pflicht(P) / Wahl(W) Wahlpflicht(WP) Semester (WiSe/SoSe) Noise & Vibration Control VL 2 3 WP Wi. Springer-Verlag Berlin. ISBN 3-540-54473-9. 2. L.L. Beranek (ed.), 1971. Noise and Vibration Control. Mc

Berlin,Technische Universität

346

Extremal shot noises, heavy tails and maxstable random fields.  

E-Print Network (OSTI)

Extremal shot noises, heavy tails and max­stable random fields. Clément Dombry # May 31, 2010 Abstract We consider the extremal shot noise defined by M(y) = sup{mh(y - x); (x, m) # #}, where function. Extremal shot noises naturally appear in extreme value theory as a model for spatial extremes

Recanati, Catherine

347

NETL: Ambient Monitoring - Air Quality Database and Analytical Tool  

NLE Websites -- All DOE Office Websites (Extended Search)

Database and Analytical Tool for Air Quality in the Upper Ohio River Valley Database and Analytical Tool for Air Quality in the Upper Ohio River Valley Advanced Technology Systems, Inc. with Ohio University and Texas A&M University - Kingsville as subcontractors, will develop a state-of-the-art, scalable and robust computer application for NETL to manage the extensive data sets resulting from the DOE-sponsored ambient air monitoring programs in the upper Ohio River valley region. Efforts will be made to include, to the greatest extent possible, ambient air data collected by other agencies in the upper Ohio River valley region, such as U.S. EPA, Pennsylvania Department of Environmental Protection (PA-DEP), West Virginia Division of Environmental Protection (WV-DEP), Ohio EPA, and the Allegheny County Health Department (ACHD). Although emphasis will be placed on data collected in the upper Ohio River valley region, the computer application developed under this Agreement will be designed, to the greatest extent possible, to access data collected at NETL-sponsored ambient air monitoring sites outside the region, such as sites operated by the Tennessee Valley Authority in the Great Smoky Mountains (under DOE Interagency Agreement DE-AI26-98FT40406) and by Southern Research Institute in North Birmingham, AL (under DOE Cooperative Agreement DE-FC26-00NT40770). The data base and analytical tool development effort will also be coordinated, to the greatest extent possible, with similar tools being developed for use by U.S. EPA. This will ensure that the database and analytical tools produced under this Agreement will be readily accessible to a wide variety of stakeholders.

348

The Inhomogeneous Structure of Water at Ambient Conditions  

NLE Websites -- All DOE Office Websites (Extended Search)

The Inhomogeneous Structure of Water at The Inhomogeneous Structure of Water at Ambient Conditions The water molecule, H2O, has deceptively simple structure, but contains all the prerequisites for building complexity. The oxygen atom has a greater affinity for electrons and pulls them away from the hydrogens making them slightly positive. On the back side of molecule oxygen has a lone pair - electrons that do not assist in binding the hydrogens in the molecule, but to which the hydrogens of another water molecule can be attracted to form a so-called hydrogen bond (H-bond). Hydrogen bond is much weaker than the bonding inside water molecule, but it is still strong enough with the possibility to make from one up to four H-bonds per water molecule. The network connected by H-bonds between water molecules makes liquid water so special compared to other normal liquids with about 66 anomalies, e.g. density maximum at 4 °C and large heat capacity. The anomalies of water become extreme in the supercooled region (below freezing point), whilst they are also present at ambient conditions where most of waters' physical, chemical and biological processes of importance occur. Water at ambient conditions has traditionally been considered as a homogeneous distribution of near- tetrahedral H-bonded structures with thermal fluctuations increasing with temperature. This picture has been challenged by recent studies based on x-ray Raman (XRS), x-ray absorption spectroscopy (XAS) and x-ray emission spectroscopy (XES), suggesting two distinct local structures with tetrahedral as a minority and highly H-bond distorted asymmetrical as the majority. In particular, the proposed predominant asymmetrical structure has caused intense debate in the last years.

349

ROUTEMAP model for predicting aircraft noise exposure along military training routes  

Science Journals Connector (OSTI)

A model and PC?based computer program has been prepared to calculate noise levels along low?altitude high?speed military training routes. The program is designed for use by environmental planning personnel who are familiar with MTR operations and with noise but are not necessarily expert. The program provides options for selecting general types of operations (visual or instrument navigation) aircraft types and speeds altitudes and nominal track centerlines. Up to 20 track/altitude/aircraft types may be defined within a 20?mi?wide corridor. Aircraft on each track have a Gaussian lateral distribution about the centerline. The program contains nominal standard deviations based on the type of operations or the user may specify a site?specific value. Aircraft noise emission levels are derived from the USAF NOISEFILE database. The program calculates L eq L dn and L dnmr where L dnmr is L dn with an adjustment to account for the onset rate of MTR aircraft noise. Program output is available in tabular form or in graphs suitable for inclusion in reports. [This work was sponsored by USAF AAMRL/BBE.

Michael J. Lucas; Kenneth J. Plotkin

1989-01-01T23:59:59.000Z

350

Underwater, low-frequency noise in a coastal sea turtle habitat  

Science Journals Connector (OSTI)

Underwater sound was recorded in one of the major coastal foraging areas for juvenile sea turtles in the Peconic Bay Estuary system in Long Island New York. The recording season of the underwater environment coincided with the sea turtle activity season in an inshore area where there is considerable boating and recreational activity especially during the summer between Independence Day and Labor Day. Within the range of sea turtle hearing average noisepressure reached 110 dB during periods of high human activity and diminished proportionally down to 80 dB with decreasing human presence. Therefore during much of the season when sea turtles are actively foraging in New York waters their coastal habitats are flooded with underwater noise. During the period of highest human activity average noisepressures within the range of frequencies heard by sea turtles were greater by over two orders of magnitude (26 dB) than during the lowest period of human activity. Sea turtles undoubtedly are exposed to high levels of noise most of which is anthropogenic. Results suggest that continued exposure to existing high levels of pervasive anthropogenic noise in vital sea turtle habitats and any increase in noise could affect sea turtle behavior and ecology.

Y. Samuel; S. J. Morreale; C. W. Clark; C. H. Greene; M. E. Richmond

2005-01-01T23:59:59.000Z

351

Quantum-noise quenching in quantum tweezers  

E-Print Network (OSTI)

The efficiency of extracting single atoms or molecules from an ultracold bosonic reservoir is theoretically investigated for a protocol based on lasers, coupling the hyperfine state in which the atoms form a condensate to another stable state, in which the atom experiences a tight potential in the regime of collisional blockade, the quantum tweezers. The transfer efficiency into the single-atom ground state of the tight trap is fundamentally limited by the collective modes of the condensate, which are thermally and dynamically excited and constitute the ultimate noise sources. This quantum noise can be quenched for sufficiently long laser pulses, thereby achieving high efficiencies, and showing that this protocol can be applied for quantum information processing based on tweezer traps for neutral atoms.

Zippilli, Stefano; Lutz, Eric; Morigi, Giovanna; Schleich, Wolfgang

2010-01-01T23:59:59.000Z

352

Autocatalytic water dissociation on Cu(110) at near ambient conditions  

SciTech Connect

Autocatalytic dissociation of water on the Cu(110) metal surface is demonstrated based on X-ray photoelectron spectroscopy studies carried out in-situ under near ambient conditions of water vapor pressure (1 Torr) and temperature (275-520 K). The autocatalytic reaction is explained as the result of the strong hydrogen-bond in the H{sub 2}O-OH complex of the dissociated final state, which lowers the water dissociation barrier according to the Broensted-Evans-Polanyi relations. A simple chemical bonding picture is presented which predicts autocatalytic water dissociation to be a general phenomenon on metal surfaces.

Mulleregan, Alice; Andersson, Klas; Ketteler, Guido; Bluhm, Hendrik; Yamamoto, Susumu; Ogasawara, Hirohito; Pettersson, Lars G.M.; Salmeron, Miquel; Nilsson, Anders

2007-05-16T23:59:59.000Z

353

Hazard surveillance for workplace magnetic fields. 1: Walkaround sampling method for measuring ambient field magnitude; 2: Field characteristics from waveform measurements  

SciTech Connect

Recent epidemiologic research has suggested that exposure to extremely low frequency (ELF) magnetic fields (MF) may be associated with leukemia, brain cancer, spontaneous abortions, and Alzheimer`s disease. A walkaround sampling method for measuring ambient ELF-MF levels was developed for use in conducting occupational hazard surveillance. This survey was designed to determine the range of MF levels at different industrial facilities so they could be categorized by MF levels and identified for possible subsequent personal exposure assessments. Industries were selected based on their annual electric power consumption in accordance with the hypothesis that large power consumers would have higher ambient MFs when compared with lower power consumers. Sixty-two facilities within thirteen 2-digit Standard Industrial Classifications (SIC) were selected based on their willingness to participate. A traditional industrial hygiene walkaround survey was conducted to identify MF sources, with a special emphasis on work stations.

Methner, M.M.; Bowman, J.D.

1998-03-01T23:59:59.000Z

354

Nonequilibrium noise in electrophoresis: the microion wind  

E-Print Network (OSTI)

We analyze theoretically the dynamics of a single colloidal particle in an externally applied electric field. The thermal motions of microions lead to an anisotropic, nonequilibrium source of noise, pro- portional to the field, in the effective Langevin equation for the colloid. The fluctuation-dissipation ratio depends strongly on frequency, and the colloid if displaced from its steady-state position relaxes with a velocity not proportional to the gradient of the logarithm of the steady-state probability.

Suropriya Saha; Sriram Ramaswamy

2009-07-02T23:59:59.000Z

355

Impacts of Vessel Noise Perturbations on the Resident Sperm Whale Population in the Gulf of Mexico  

E-Print Network (OSTI)

RESPONSE TO NOISE ........... 92 VII FRAMEWORK FOR THE MANAGEMENT OF MARINE NOISE POLLUTION ....................................................................................... 101 Regional Framework for Noise... Pollution Management ................ 102 Nation-State Provisions .................................................................. 106 International Framework for Noise Pollution Management .......... 112 Proposed Guidelines...

Azzara, Alyson

2012-07-16T23:59:59.000Z

356

Toward Distinguishing Woodsmoke and Diesel Exhaust in Ambient Particulate Matter  

SciTech Connect

Particulate matter (PM) from biomass burning and diesel exhaust has distinct X-ray spectroscopic, carbon specific signatures, which can be employed for source apportionment. Characterization of the functional groups of a wide selection of PM samples (woodsmoke, diesel soot, urban air PM) was carried out using the soft X-ray spectroscopy capabilities at the synchrotron radiation sources in Berkeley (ALS) and Brookhaven (NSLS). The spectra reveal that diesel exhaust particulate (DEP) matter is made up from a semigraphitic solid core and soluble organic matter, predominantly with carboxylic functional groups. Woodsmoke PM has no or a less prevalent, graphitic signature, instead it contains carbon-hydroxyl groups. Using these features to apportion the carbonaceous PM in ambient samples we estimate that the relative contribution of DEP to ambient PM in an urban area such as Lexington, KY and St. Louis, MO is 7% and 13.5%, respectively. These values are comparable to dispersion modeling data from nonurban and urban areas in California, and with elemental carbon measurements in urban locations such as Boston, MA, Rochester, NY, and Washington, DC.

Braun,A.; Huggins, F.; Kubatova, A.; Wirick, S.; Maricq, M.; Mun, B.; McDonald, J.; Kelly, K.; Shah, N.; Huffman, G.

2008-01-01T23:59:59.000Z

357

A Brief Review of Known Effects of Noise on Marine Mammals  

E-Print Network (OSTI)

of noise from an oil drilling platform. Zoo Biology, 9, 393-after playbacks of oil drilling platform noise to captive

Weilgart, Linda S.

2007-01-01T23:59:59.000Z

358

In this paper we describe work being conducting to better understand the design of ambient information. We define  

E-Print Network (OSTI)

Information System, Framework, Public Ambient Display ACM Classification Keywords H5.m. Information interfaces

Connelly, Kay

359

CO{sub 2} dial transmitter/receiver noise characterization and related correlated noise issues  

SciTech Connect

Our approach concerning the development of hard target return CO{sub 2} DIAL transmitter/receiver systems is two phased- (i) through analysis and experiment, develop a fundamental understanding of the transmitter/receiver physics specific to DIAL systems and (ii) apply these fundamentals in the development of optimal performance DIAL transmitter/receiver systems. We present our progress and results towards these objectives with the following topics addressed: A general overview of the DIAL transmitter/receiver system characterization effort with a focus on transceiver noise processes. The effects of correlated noise on DIAL performance, especially those effecting statistical convergence over long sample structures, is , introduced. And, preliminary measurements of a low-noise, ``white`` receiver prototype are presented.

Cooke, B.; Schmitt, M.; Goeller, R.; Czuchlewski, S.; Fuller, K.; Olivas, N.; Laubscher, B.; Sander, R.

1996-02-01T23:59:59.000Z

360

Ambient illumination revisited: A new adaptation-based approach for optimizing medical imaging reading environments  

SciTech Connect

Ambient lighting in soft-copy reading rooms is currently kept at low values to preserve contrast rendition in the dark regions of a medical image. Low illuminance levels, however, create inadequate viewing conditions and may also cause eye strain. This eye strain may be potentially attributed to notable variations in the luminance adaptation state of the reader's eyes when moving the gaze intermittently between the brighter display and darker surrounding surfaces. This paper presents a methodology to minimize this variation and optimize the lighting conditions of reading rooms by exploiting the properties of liquid crystal displays (LCDs) with low diffuse reflection coefficients and high luminance ratio. First, a computational model was developed to determine a global luminance adaptation value, L{sub adp}, when viewing a medical image on display. The model is based on the diameter of the pupil size, which depends on the luminance of the observed object. Second, this value was compared with the luminance reflected off surrounding surfaces, L{sub s}, under various conditions of room illuminance, E, different values of diffuse reflection coefficients of surrounding surfaces, R{sub s}, and calibration settings of a typical LCD. The results suggest that for typical luminance settings of current LCDs, it is possible to raise ambient illumination to minimize differences in eye adaptation, potentially reducing visual fatigue while also complying with the TG18 specifications for controlled contrast rendition. Specifically, room illumination in the 75-150 lux range and surface diffuse reflection coefficients in the practical range of 0.13-0.22 sr{sup -1} provide an ideal setup for typical LCDs. Future LCDs with lower diffuse reflectivity and with higher inherent luminance ratios can provide further improvement of ergonomic viewing conditions in reading rooms.

Chawla, Amarpreet S.; Samei, Ehsan [Duke Advanced Imaging Laboratories, Departments of Radiology and Biomedical Engineering, Duke University, Durham, North Carolina 27705 (United States); Duke Advanced Imaging Laboratories, Departments of Radiology, Physics, Medical Physics, and Biomedical Engineering, Duke University, Durham, North Carolina 27705 (United States)

2007-01-15T23:59:59.000Z

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

coleo explorando o ensino o brasil e o meio ambiente antrtico  

E-Print Network (OSTI)

coleção explorando o ensino 10 volume o brasil e o meio ambiente antártico #12;#12;coleção explorando o ensino volume 10 ensino fundamental e ensino médio o brasil e o meio ambiente antártico #12 Dados Internacionais de Catalogação na Publicação (CIP) O Brasil e o meio ambiente antártico : ensino

362

Noise control versus shock and vibration engineering  

Science Journals Connector (OSTI)

Noise control and shock and vibration engineering have many fundamentals in common and many analogous practical constraints. Yet in many respects they tend to be opposite in methodology philosophy and past history. The present discussion is an attempt to present the point of view of the practicing engineer in either field who has some perspective on the historical origins of his art. It focuses on aspects that epitomize the practical objectives of such engineers plus any administrators lawyers etc. who may also be involved in team efforts. For noise control the aspects chosen are establishment of regulations monitoring and design or other actions intended to bring about compliance with regulations. For shock and vibration engineering they are establishment of environmental specifications to ensure reliability environmental testing in accordance with these and design or redesign to bring about compliance with test requirements and also (we hope) to bring about reliability without severe penalties in weight schedule or cost. This is not to say that these aspects in their barest sense represent all the technology or methodology that is pertinent or even that these limited aspects will be treated comprehensively. It is almost self?evident that the Acoustical Society of America should and does maintain beneficial relationship with medical psychological mechanical engineering and other societies that report their particular developing lore of fundamentals and some practical information from their particular viewpoint. The Acoustical Society is an important part of this spectrum by virtue of its interdisciplinary coverage extending through materials dynamics sound instrumentation and electronics to speech and hearing. But it is also worthwhile for the ASA by whatever means are available to sample the flavor of various disciplines as unified and value?weighted in accordance with typical practical objectives. For this reason the developing beneficial relationships with the Institute of Noise Control (INCE) and the Shock and Vibration Information Center (SVIC) will become increasingly important.

Charles T. Morrow

1974-01-01T23:59:59.000Z

363

E-Print Network 3.0 - ambiente solo-semente por Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

el medio ambiente. Igualmente ocurre con los agentes biocidas orgnicos... del tipo triclosan, altamente txicos y contaminantes. Liberacin de iones por parte de las...

364

E-Print Network 3.0 - ambiental por derramamento Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

el medio ambiente. Igualmente ocurre con los agentes biocidas orgnicos... del tipo triclosan, altamente txicos y contaminantes. Liberacin de iones por parte de las...

365

E-Print Network 3.0 - ambiental por centelleo Sample Search Results  

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el medio ambiente. Igualmente ocurre con los agentes biocidas orgnicos... del tipo triclosan, altamente txicos y contaminantes. Liberacin de iones por parte de las...

366

E-Print Network 3.0 - ambiental por bacillus Sample Search Results  

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el medio ambiente. Igualmente ocurre con los agentes biocidas orgnicos... del tipo triclosan, altamente txicos y contaminantes. Liberacin de iones por parte de las...

367

E-Print Network 3.0 - ambiental na costa Sample Search Results  

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for Systems and Robotics, Lisboa Collection: Engineering 3 coleo explorando o ensino o brasil e o meio ambiente antrtico Summary: Dados Internacionais de Catalogao na...

368

E-Print Network 3.0 - ambiente tabuleiros costeiros Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

ambiente, na restinga do Parque Estadual da Serra do Tabuleiro, Santa Catarina, Sul do Brasil. 2. Materiais... RESTINGA DO PARQUE ESTADUAL DA SERRA DO TABULEIRO, SANTA CATARINA....

369

E-Print Network 3.0 - ambiental das atividades Sample Search...  

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4 Sistemas de Gerncia de Workflows: Caractersticas, Distribuio e Luiz Antnio M. Pereira Summary: ;8 ambiente operacional e colocao das vrias atividades nas...

370

E-Print Network 3.0 - ambient pressure sensitivity Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

and spoilage organisms while keeping Summary: of the pressure (Figure 2). Both pure water and most moist foods subjected to a 600 MPa treatment at ambient... viruses appear...

371

Personal and Ambient Air Pollution is Associated with Increased Exhaled Nitric Oxide in Children with Asthma  

E-Print Network (OSTI)

ambient air pollution and respiratory health in schoolEnvironmental Health Perspectives Air pollution and F ENO inEnvironmental Health Perspectives Air pollution and F ENO in

2006-01-01T23:59:59.000Z

372

E-Print Network 3.0 - areas gestao ambiental Sample Search Results  

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IMPERATRIZ TASSINARI CFH 12 EDUCACAO AMBIENTAL COM BASE EM... GESTAO DE RESIDUOS E HORTA ORGANICA NO LAR RECANTO DO CARINHO - FLORIANOPOLIS ANTONIO AUGUSTO ALVES... PILOTO DA...

373

Cyclic deformation behaviour of austenitic steels at ambient and elevated temperatures  

Science Journals Connector (OSTI)

The aim of the present investigation is to characterise cyclic deformation behaviour and plasticity-induced martensite formation of metastable austenitic stainless steels at ambient and elevated temperatures, ...

Th. Nebel; D. Eifler

374

Effect of ambient conditions and fuel properties on homogeneous charge compression ignition engine operation  

E-Print Network (OSTI)

Practical application of Homogeneous Charge Compression Ignition (HCCI) combustion must demonstrate robust responses to variations in environmental conditions. This work examines the impact of ambient conditions and fuel ...

Andreae, Morgan M. (Morgan MacKenzie)

2006-01-01T23:59:59.000Z

375

E-Print Network 3.0 - ambient fine particulate Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

about Clean Transportation projects at the North Carolina Solar Center Summary: or maintenance areas for national ambient air quality standards (NAAQS) for ozone andor fine...

376

E-Print Network 3.0 - ambiente responsabilidade social Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

ambiente responsabilidade social Page: << < 1 2 3 4 5 > >> 1 DEONTOLOGA EMPRESARIAL PRIMER TRIMESTRE CURSO ACADMICO 2010-2011 Summary: equilibrar las finalidades de la empresa...

377

E-Print Network 3.0 - ambient polycyclic aromatic Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Adducts in Mothers Summary: . Exposure to genotoxins present in ambient air in Bangkok, Thailand: particle associated polycyclic aromatic... DNA Damage from Polycyclic Aromatic...

378

Chapter 51 Attainment and Maintenance of the National Ambient Air Quality Standards (Kentucky)  

Energy.gov (U.S. Department of Energy (DOE))

Kentucky Administrative Regulation Chapter 51, entitled Attainment and Maintenance of the National Ambient Air Quality Standards, is promulgated under the authority of the Division of Air Quality...

379

E-Print Network 3.0 - ambiente una alternativa Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

ambiental ha creado la necesidad de elegir una fuente de energa con bajas emisiones de . Por... , otorgando una alternativa viable de transportacin. A pesar que el...

380

E-Print Network 3.0 - ambiental da escola Sample Search Results  

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d'Igualada 7 Igualada Inspecci de Materials i... i Medi Ambient: Integraci d'Energies Renovables a l'Arquitectura ... Source: Politcnica de Catalunya, Universitat -...

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

E-Print Network 3.0 - ambiental institucionalizada actos Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

ambiente PABLO MUNERA BRUIN Tecnologa Source: Escolano, Francisco - Departamento de Ciencia de la Computacin e Inteligencia Artificial, Universitat d'Alacant Collection:...

382

E-Print Network 3.0 - ambiental qualification analisis Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

una prova orale. La prova scritta... nella discussione di esercizi svolti in ambiente Matlab. 1. Un mese prima della data prevista per l Source: Guerrini, Carla - Dipartimento di...

383

Personal and Ambient Air Pollution is Associated with Increased Exhaled Nitric Oxide in Children with Asthma  

E-Print Network (OSTI)

1994. Nitric oxide and nitrogen dioxide: Method 6014. In:Molecular mechanisms of nitrogen dioxide induced epithelialEC, OC), and 24-hr nitrogen dioxide. Ambient exposures

2006-01-01T23:59:59.000Z

384

Uma arquitetura de software neuro-reativa para sistemas de automação do ambiente construído.  

E-Print Network (OSTI)

??Esta tese propõe uma arquitetura de software neuro-reativa para sistemas de automação do ambiente construído. O objetivo é facilitar o desenvolvimento, a manutenção e a… (more)

Álvaro Messias Bigonha Tibiriçá

2008-01-01T23:59:59.000Z

385

E-Print Network 3.0 - ambient temperature secondary Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

constant over a wide range of ambient temperatures. Heat lost... heat production, Q heat loss, C conductance, Tb ... Source: Jodice, Patrick - Department of Forestry and...

386

E-Print Network 3.0 - ambient stable quantitative Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

equations. In this paper an ambient agent ... Source: Treur, Jan - Department of Artificial Intelligence, Vrije Universiteit Amsterdam Collection: Computer Technologies and...

387

Quantitative hydrogen analysis of zircaloy-4 in laser-induced breakdown spectroscopy with ambient helium gas  

Science Journals Connector (OSTI)

This experiment was carried out to address the need for overcoming the difficulties encountered in hydrogen analysis by means of plasma emission spectroscopy in atmospheric ambient...

Ramli, Muliadi; Fukumoto, Ken-ichi; Niki, Hideaki; Abdulmadjid, Syahrun Nur; Idris, Nasrullah; Maruyama, Tadashi; Kagawa, Kiichiro; Tjia, May On; Pardede, Marincan; Kurniawan, Koo Hendrik; Hedwig, Rinda; Lie, Zener Sukra; Lie, Tjung Jie; Kurniawan, Davy Putra

2007-01-01T23:59:59.000Z

388

E-Print Network 3.0 - ambient particle pollution Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

is proposed to address critical issues relating to the public health impacts of ambient air pollution... . The overarching theme of the Center is a focus on characterizing...

389

E-Print Network 3.0 - ambient particle-bound pollution Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

is proposed to address critical issues relating to the public health impacts of ambient air pollution... . The overarching theme of the Center is a focus on characterizing...

390

E-Print Network 3.0 - ambient particulate matterpm10 Sample Search...  

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particulate matterpm10 Page: << < 1 2 3 4 5 > >> 1 Statistical Issues in the Study of Air Pollution Involving Airborne Particulate Matter Summary: Ambient Air Quality Standards...

391

E-Print Network 3.0 - ambient pollutant particles Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

is proposed to address critical issues relating to the public health impacts of ambient air pollution... . The overarching theme of the Center is a focus on characterizing...

392

E-Print Network 3.0 - ambient particulate matter-induced Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

particulate matter-induced Page: << < 1 2 3 4 5 > >> 1 Statistical Issues in the Study of Air Pollution Involving Airborne Particulate Matter Summary: Ambient Air Quality Standards...

393

E-Print Network 3.0 - ambiente uma proposta Sample Search Results  

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uma vez que estejam presentes em uma teoria, tudo Summary: em um ambiente consistente (neste caso, pelo acrescimo de consistente-A como uma hipotese adicional......

394

E-Print Network 3.0 - altas temperaturas ambientes Sample Search...  

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Geosciences ; Physics 34 MTODO DE CENSO Y ESTIMA DE POBLACIN DEL PINZN AZUL DE GRAN CANARIA Summary: ambiente en los sustratos de alimentacin del Pinzn azul. Para...

395

E-Print Network 3.0 - ambient ultrafine particles Sample Search...  

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Centre de mathmatiques Collection: Mathematics 5 Kendrick et al. 1 THE IMPACT OF BICYCLE LANE CHARACTERISTICS ON BICYCLISTS'1 Summary: ). Number concentrations in ambient air...

396

Detector Configurations for Equivalence Principle Tests with Strong Separation of Signal from Noise  

Science Journals Connector (OSTI)

Testing the Equivalence Principle (EP) at a level of accuracy substantially higher than the present state of the art requires resolving a very small signal out of the instrument’s intrinsic noise and also the noise associated with the instrument’s motion and gravity gradients. In the test of the Equivalence Principle in an Einstein Elevator under development by our team the acceleration detector spins about a horizontal axis while free falling for about 25 s inside a co?moving capsule released from a stratospheric balloon. The characteristics of the instrument package and the configuration of the detector play a key role in the ability to extract an EP violation signal at the desired threshold level out of dynamics?related noise. Numerical simulations of the detector’s dynamics in the presence of relevant perturbations having assumed realistic errors and construction imperfections show the merits of the detector configuration selected. The results illustrate that the effects of dynamics and gravity gradients near or at the signal frequency can be limited to levels much smaller than the expected threshold sensitivity of the detector.

E. C. Lorenzini; I. I. Shapiro; J. Ashenberg; C. Bombardelli; P. N. Cheimets; V. Iafolla; D. M. Lucchesi; S. Nozzoli; F. Santoli; S. Glashow

2006-01-01T23:59:59.000Z

397

Characterization of ambient air pollution for stochastic health models  

SciTech Connect

This research is an analysis of various measures of ambient air pollution useful in cross-sectional epidemiological investigations and rick assessments. The Chestnut Ridge area health effects investigation, which includes a cross-sectional study of respiratory symptoms in young children, is used as a case study. Four large coal-fired electric generating power plants are the dominant pollution sources in this area of western Pennsylvania. The air pollution data base includes four years of sulfur dioxide and five years of total suspended particulate concentrations at seventeen monitors. Some 70 different characterizations of pollution are constructed and tested. These include pollutant concentrations at various percentiles and averaging times, exceedence measures which show the amount of time a specified threshold concentration is exceeded, and several dosage measures which transform non-linear dose-response relationships onto pollutant concentrations.

Batterman, S.A.

1981-08-01T23:59:59.000Z

398

Whistler Modes with Wave Magnetic Fields Exceeding the Ambient Field  

Science Journals Connector (OSTI)

Whistler-mode wave packets with fields exceeding the ambient dc magnetic field have been excited in a large, high electron-beta plasma. The waves are induced with a loop antenna with dipole moment either along or opposite to the dc field. In the latter case the excited wave packets have the topology of a spheromak but are propagating in the whistler mode along and opposite to the dc magnetic field. Field-reversed configurations with net zero helicity have also been produced. The electron magnetohydrodynamics fields are force free, have wave energy density exceeding the particle energy density, and propagate stably at subelectron thermal velocities through a nearly uniform stationary ion density background.

R. L. Stenzel; J. M. Urrutia; K. D. Strohmaier

2006-03-10T23:59:59.000Z

399

Numerical prediction of the effect of traffic lights on the vehicle noise at urban street intersections  

Science Journals Connector (OSTI)

Intersections of urban streets are particularly noisy locations due to the addition of the noise from vehicles at different streets a long period of noise emission from queuing vehicles with traffic lights in red and the noise from accelerating vehicles. Besides the traffic lights impose a modulation in the passage of the vehicles so that the subsequent noise variability along time contributes to increase the annoyance degree. This paper presents a code especially developed to simulate both the spatial and temporal distribution of the sound pressure levels induced by the vehicle traffic in street intersections. The algorithm combines a traffic model with vehicles in dynamic motion through the domain with a model for sound propagation based on the method of virtual images in which the determination of the location of the successive image sources was reduced to a reference horizontal plane. Sound emission from each vehicle was established according to the Harmonoise guidelines. After verifying the code predictions by comparison with measurements at several street intersections the method was applied systematically to investigate the effect of varying the regulation parameters of the traffic lights on the Leq and L10 distributions for some particular cases.

Jorge Parrondo; Ruben Zurita; Jose A. Corrales; Joaquin Fernandez

2008-01-01T23:59:59.000Z

400

Assessing noise impacts on wildlife under the National Environmental Policy Act.  

Science Journals Connector (OSTI)

Under the National Environmental Policy Act authors must address environmental impacts of various anthropogenic actions on wildlife. One such impact of increasing awareness and concern is effectnoise on wildlife both during construction and operation of the project. However biologists often have difficulty in understanding the fundamentals of acoustics and noiseanalysts often have difficulty in understanding the biological implications of increased noise on wildlife. As a result inappropriate weighting metrics (such as A?weighted decibel) or time descriptors (e.g. community noise equivalent level) are often used erroneously to assess noiseimpacts on wildlife.Noise exposure thresholds on wildlife exist for marine mammals and fish as mandated by the National Marine Fisheries Service. However no such thresholds exist for terrestrial wildlife. This talk provides specific examples of how noiseimpacts on wildlife have been assessed using GIS?based technology industry?accepted noise propagation models and peer?reviewed literature in the absence of management guidelines. Examples include assessing construction noiseimpacts on the California coastal gnatcatcher in southern California aircraft noiseimpacts on sage grouse in central California and helicopter disturbance on caribou in Alaska.

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Directional noise and correlation of signal and noise variability in the ASIAEX South China Sea Experiment  

Science Journals Connector (OSTI)

As part of the 2001 ASIAEX South China Sea experiment known acoustic signals and noise were recorded for 16 days with co?located horizontal and vertical receiving arrays in 120?m depth water at the edge of the continental shelf. The location was south of China and southwest of Taiwan. Vertical and horizontal directionality of both signals and noise can be estimated using the two arrays. Directionality can be linked to vertical mode bandwidth. Furthermore because of mode stripping effects it can indicate the amount of mode coupling in the vicinity of the receiver. Previously arrival time and total energy of the signals have been shown to respond to the strong nonlinear internal waves and internal tides of the area. Here we investigate the response of noiseenergy and directionality to the waves and compare with the response of signal energy and directionality. The results can be compared to the Shelfbreak PRIMER experiment in the Mid?Atlantic Bight where signal and noise parameters recorded with a VLA were correlated. Correlation of signal and noise violates assumptions used in many signal processing algorithms.

2003-01-01T23:59:59.000Z

402

On the use of noise budgets to assess the effects of offshore wind farms on marine life.  

Science Journals Connector (OSTI)

An oceannoise budget is a list of sources of noise along with their average intensity in a particular frequency band [Frisk et al. (2003)]. The budget can be calculated from acoustic data collected by the passive aquatic listener (PAL) systems [Nystuen and Howe (2005); Miller et al. (2008)]. In the far field the average acoustic intensity of plane waves can be computed in 1/3?octave bands over some duration. The assumption is made that the noise in the band at any one time is dominated by a single identifiable source such as wind rain shipping fish marine mammals etc. The duration and instantaneous intensity of the acoustic signal is used to calculate the average. Identification is carried out using the ratios of various spectral levels as outlined in the work of Ma et al. [(2005)]. We apply the concept of noise budgets to the assessment of the impact of long term noise from offshore wind turbines on marine life. A developer has proposed to construct more than 200 wind turbines south of Rhode Island. A noise budget has been calculated for the region from data collected on PALs. The addition of the 200 turbines will be incorporated into the budget parametrized on source level.

James H. Miller; Gopu R. Potty; David S. Casagrande; Kathleen J. Vigness Raposa; Lisa A. Miller; Jeffrey A. Nystuen; Peter M. Scheifele; John Greer Clark

2011-01-01T23:59:59.000Z

403

Review of Subcritical Source-Driven Noise Analysis Measurements  

SciTech Connect

Subcritical source-driven noise measurements are simultaneous Rossia and randomly pulsed neutron measurements that provide measured quantities that can be related to the subcritical neutron multiplication factor. In fact, subcritical source-driven noise measurements should be performed in lieu of Rossia measurements because of the additional information that is obtained from noise measurements such as the spectral ratio and the coherence functions. The basic understanding of source-driven noise analysis measurements can be developed from a point reactor kinetics model to demonstrate how the measured quantities relate to the subcritical neutron multiplication factor.

Valentine, T.E.

1999-11-01T23:59:59.000Z

404

Beneficial role of noise in artificial neural networks  

SciTech Connect

We demonstrate enhancement of neural networks efficacy to recognize frequency encoded signals and/or to categorize spatial patterns of neural activity as a result of noise addition. For temporal information recovery, noise directly added to the receiving neurons allow instantaneous improvement of signal-to-noise ratio [Monterola and Saloma, Phys. Rev. Lett. 2002]. For spatial patterns however, recurrence is necessary to extend and homogenize the operating range of a feed-forward neural network [Monterola and Zapotocky, Phys. Rev. E 2005]. Finally, using the size of the basin of attraction of the networks learned patterns (dynamical fixed points), a procedure for estimating the optimal noise is demonstrated.

Monterola, Christopher [National Institute of Physics, University of the Philippines 1101 Diliman Quezon City (Philippines); Max-Planck Institut fuer Physik Komplexer Systeme Noethnitzerstrasse 38, 01187, Dresden (Germany); Saloma, Caesar [National Institute of Physics, University of the Philippines 1101 Diliman Quezon City (Philippines); Zapotocky, Martin [Max-Planck Institut fuer Physik Komplexer Systeme Noethnitzerstrasse 38, 01187, Dresden (Germany)

2008-06-18T23:59:59.000Z

405

Mixed noise removal by weighted low rank model  

Science Journals Connector (OSTI)

Abstract Mixed noise removal has been a challenging task due to the complex noise distribution. One representative type of mixed noise is the additive white Gaussian noise (AWGN) coupled with impulse noise (IN). Most mixed noise removal methods first detect and restore impulse pixels using median-type filters, and then perform AWGN removal. Such mixed noise removal methods, however, are less effective in preserving image structures, and tend to over-smooth image details. In this paper, we present a novel mixed noise removal method by proposing a weighted low rank model (WLRM). By grouping image nonlocal similar patches as a matrix, we reconstruct the clean image by finding the weighted low rank approximation or representation of the matrix. IN can be well suppressed by the adaptive weight setting, while the image global structure and local edges can be well preserved via the low rank model fitting. The weight setting and low rank model fitting are jointly optimized in WLRM. Our experiments validate that WLRM leads to very promising mixed noise removal results in terms of both quantitative measure and visual perception.

Jielin Jiang; Jian Yang; Yan Cui; Lei Luo

2014-01-01T23:59:59.000Z

406

Very low noise cryogenic receivers and measurement electronics.  

E-Print Network (OSTI)

??The purpose of this thesis was to develop very low noise cryogenic receivers and related high accuracy measurement setups to validate the operation of the… (more)

Sjöman, Pekka

2009-01-01T23:59:59.000Z

407

Digital halftoning by means of green-noise masks  

Science Journals Connector (OSTI)

We introduce a novel technique for generating green-noise halftones—stochastic dither patterns composed of homogeneously distributed pixel clusters. Although techniques employing error...

Lau, Daniel L; Arce, Gonzalo R; Gallagher, Neal C

1999-01-01T23:59:59.000Z

408

Hawaii Guide for Filing Community Noise Variance Applications...  

Open Energy Info (EERE)

for completing Noise Variance Applications. Author State of Hawaii Department of Health Published State of Hawaii, 072013 DOI Not Provided Check for DOI availability: http:...

409

Hawaii Application for Community Noise Variance (DOH Form) |...  

Open Energy Info (EERE)

Application for Community Noise Variance Organization State of Hawaii Department of Health Published Publisher Not Provided, 072013 DOI Not Provided Check for DOI availability:...

410

Hawaii Application for Community Noise Permit (DOH Form CNP)...  

Open Energy Info (EERE)

Application for Community Noise Permit Organization State of Hawaii Department of Health Published Publisher Not Provided, 012008 DOI Not Provided Check for DOI availability:...

411

Integration of Noise and Coda Correlation Data into Kinematic...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Integration of Noise and Coda Correlation Data into Kinematic and Waveform Inversions Fracture Network and Fluid Flow Imaging for EGS Applications from Multi-Dimensional Electrical...

412

Enabling Green Energy and Propulsion Systems via Direct Noise...  

NLE Websites -- All DOE Office Websites (Extended Search)

Umesh Paliath, GE Global Research; Joe Insley, Argonne National Laboratory Enabling Green Energy and Propulsion Systems via Direct Noise Computation PI Name: Umesh Paliath PI...

413

Enabling Green Energy and Propulsion Systems via Direct Noise...  

NLE Websites -- All DOE Office Websites (Extended Search)

GE propulsion systems Enabling Green Energy and Propulsion Systems via Direct Noise Computation PI Name: Umesh Paliath PI Email: paliath@ge.com Institution: GE Global Research...

414

The new ambient-pressure X-ray photoelectron spectroscopy instrument at MAX-lab  

Science Journals Connector (OSTI)

The new instrument for ambient-pressure X-ray photoelectron spectroscopy at the Swedish synchrotron radiation facility MAX IV Laboratory is presented. The instrument is based on the use of a retractable and exchangeable high-pressure cell, which implies that ultrahigh-vacuum conditions are retained in the analysis chamber and that dual ambient pressure and ultrahigh-vacuum use is possible.

Schnadt, J.

2012-08-07T23:59:59.000Z

415

INTRODUCTION Energy harvesting is the transformation of ambient energy present in  

E-Print Network (OSTI)

INTRODUCTION Energy harvesting is the transformation of ambient energy present in the environment into electrical energy. This energy is derived from different external sources such as solar power, thermal energy, wind energy, salinity gradient and kinetic energy. Harvesting energy from ambient vibration has

Sóbester, András

416

Physical properties of ambient and laboratory-generated secondary organic aerosol  

E-Print Network (OSTI)

with condensed phase diffusion rates that are fast enough to maintain equilibrium with the gas phase [Pankow on small sample sizes with little intercomparison across ambient samples, and only a few studies [Virtanen et al., 2010; Vaden et al., 2011] compared laboratory and ambient samples. An investigation

Nizkorodov, Sergey

417

Sensor9k: A testbed for designing and experimenting with WSN-based ambient intelligence applications  

Science Journals Connector (OSTI)

Ambient Intelligence systems are typically characterized by the use of pervasive equipment for monitoring and modifying the environment according to users' needs, and to globally defined constraints. Our work describes the implementation of a testbed ... Keywords: Ambient intelligence, Energy efficiency, Probabilistic reasoning, Wireless sensor and actuator networks

Alessandra De Paola; Salvatore Gaglio; Giuseppe Lo Re; Marco Ortolani

2012-06-01T23:59:59.000Z

418

UNCERTAINTY CALIBRATION OF LARGE-ORDER MODELS OF BRIDGES USING AMBIENT VIBRATION MEASUREMENTS  

E-Print Network (OSTI)

UNCERTAINTY CALIBRATION OF LARGE-ORDER MODELS OF BRIDGES USING AMBIENT VIBRATION MEASUREMENTS frequencies and mode shapes based on ambient vibration measurements collected from a wireless mobile measuring, such as modal frequencies, modal damping ratios and mode shapes, through vibration measurements, as well

Boyer, Edmond

419

Abstract--This paper presents ambient mechanical vibrations as an alternative source for energy harvesting, especially  

E-Print Network (OSTI)

Abstract--This paper presents ambient mechanical vibrations as an alternative source for energy harvesting, especially beneficial where alternatives such as light, wind, biomass and thermal energy are limited, e.g., powering underground sensors. Transduction of ambient kinetic energy, e.g., the vibrations

Kumar, Ratnesh

420

Mirant: Ambient 24 Hour SO2 Values: Model vs Monitor | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Mirant: Ambient 24 Hour SO2 Values: Model vs Monitor Mirant: Ambient 24 Hour SO2 Values: Model vs Monitor Mirant: Ambient 24 Hour SO2 Values: Model vs Monitor Docket No. EO-05-01: Mirant: Ambient 24 Hour SO2 Values: Model vs Monitor, March 2002 to November 2004, showing the model overprediction Mirant: Ambient 24 Hour SO2 Values: Model vs Monitor More Documents & Publications Comments on Department of Energy's Emergency Order To Resume Limited Operation at Mirant's Potomac River Generating Station and Proposed Mirant Compliance Plan Answer of Potomac Electric Power Company and PJM lnterconnection, L.L.C. to the October 6, 2005 motion filed by the Virginia Department of Environmental Quality Special Environmental Analysis For Actions Taken under U.S. Department of Energy Emergency Orders Regarding Operation of the Potomac River Generating

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Quantum-noise quenching in atomic tweezers  

SciTech Connect

The efficiency of extracting single atoms or molecules from an ultracold bosonic reservoir is theoretically investigated for a protocol based on lasers, coupling the hyperfine state in which the atoms form a condensate to another stable state, in which the atom experiences a tight potential in the regime of collisional blockade, the quantum tweezers. The transfer efficiency into the single-atom ground state of the tight trap is fundamentally limited by the collective modes of the condensate, which are thermally and dynamically excited. The noise due to these excitations can be quenched for sufficiently long laser pulses, thereby achieving high efficiencies. These results show that this protocol can be applied to initializing a quantum register based on tweezer traps for neutral atoms.

Zippilli, Stefano [Departament de Fisica, Universitat Autonoma de Barcelona, E-08193 Bellaterra (Spain); Theoretische Physik, Universitaet des Saarlandes, D-66041 Saarbruecken (Germany); Fachbereich Physik and Research Center OPTIMAS, Technische Universitaet Kaiserslautern, D-67663 Kaiserslautern (Germany); Mohring, Bernd; Schleich, Wolfgang [Institut fuer Quantenphysik, Universitaet Ulm, D-89081 Ulm (Germany); Lutz, Eric [Department of Physics, University of Augsburg, D-86135 Augsburg (Germany); Morigi, Giovanna [Departament de Fisica, Universitat Autonoma de Barcelona, E-08193 Bellaterra (Spain); Theoretische Physik, Universitaet des Saarlandes, D-66041 Saarbruecken (Germany)

2011-05-15T23:59:59.000Z

422

Quantum-noise quenching in atomic tweezers  

E-Print Network (OSTI)

The efficiency of extracting single atoms or molecules from an ultracold bosonic reservoir is theoretically investigated for a protocol based on lasers, coupling the hyperfine state in which the atoms form a condensate to another stable state, in which the atom experiences a tight potential in the regime of collisional blockade, the quantum tweezers. The transfer efficiency into the single-atom ground state of the tight trap is fundamentally limited by the collective modes of the condensate, which are thermally and dynamically excited. The noise due to these excitations can be quenched for sufficiently long laser pulses, thereby achieving high efficiencies. These results show that this protocol can be applied for initializing a quantum register based on tweezer traps for neutral atoms.

Stefano Zippilli; Bernd Mohring; Eric Lutz; Giovanna Morigi; Wolfgang Schleich

2011-04-15T23:59:59.000Z

423

Investigation of noise sources in SQUID electronics  

SciTech Connect

The performance of SQUID-based electronics outside a laboratory-controlled environment may be degraded from that found in laboratory operation. Investigations on superconducting tubes, wires, and sheets have been conducted to identify contributions to such noise. Results have been obtained for bulk and thin film samples utilizing both the conventional low temperature materials, as well as the new high temperature oxide materials. Experiments have been conducted to quantify flux redistribution and flux motion in superconducting samples subjected to temperature changes, temperature gradients, and magnetic field gradients. These investigations have been conducted at magnetic fields typical of many SQUID applications, with field intensities much smaller than the critical values H/sub cl/. Penetration depth effects, flux pinning effects, and flux motion effects have been observed. The various types of experiments conducted along with specific results are described.

Clem, T.R.; Goldstein, M.J.; Purpura, J.W.; Allen, L.H.; Claassen, J.H.; Gubser, D.U.; Wolf, S.A.

1989-03-01T23:59:59.000Z

424

Filtered noise field signals for mass-selective accumulation of externally formed ions in a quadrupole ion trap  

SciTech Connect

A new wideband resonance excitation technique, termed a filtered noise field (FNF), is demonstrated for selective accumulation of externally formed ions in the rf quadrupole ion trap. Data obtained for detection of trinitrotoluene (TNT) and black powder vapors in ambient air, via atmospheric sampling glow discharge ionization (ASGDI), indicate that a notch-filtered FNF signal applied to the endcap electrodes can prevent accumulation of matrix ions without adversely affecting the ion injection efficiency of analyte species. Consequently, analyte signal enhancement can be realized via extended ion accumulation times even though unwanted ions are present in overwhelming abundance. The TNT molecular anion signal obtained following a 1-s injection period is a factor of approximately 8 greater than that seen without the FNF; S[sub 2][sup [minus

Goeringer, D.E.; Asano, K.G.; McLuckey, S.A. (Oak Ridge National Lab., TN (United States)); Hoekman, D. (Teledyne Electronic Technologies, Mountain View, CA (United States)); Stiller, S.W. (Hitachi Instruments, Inc., San Jose, CA (United States))

1994-02-01T23:59:59.000Z

425

Prediction of underwater noise and far field propagation due to pile driving for offshore wind farms  

Science Journals Connector (OSTI)

Wind energy plays a key role towards a greener and more sustainable energy generation. Due to limited onshore areas and possible negative effects on human living space offshore wind parks become increasingly popular. However during construction by pile driving high levels of underwater sound emission are observed. To avoid negative effects on marine mammals and other sea life different approaches are currently investigated to cut down the sound pressure levels like e.g. bubble curtains or cofferdams. In order to predict the expected underwater noise both with and without sound damping measures numerical simulation models are needed to avoid complex and costly offshore tests. Within this contribution possible modelling strategies for the prediction of underwater noise due to pile driving are discussed. Different approaches are shown for the direct adjacencies of the pile and for the far field sound propagation. The effectivity of potential noise mitigation measures is investigated using a detailed finite element model of the surroundings of the pile. Far field propagation in the kHz range at distances of several kilometres from the pile on the other hand is computed by a model based on wavenumber integration. Finally the model validation with corresponding offshore tests is addressed.

Stephan Lippert; Tristan Lippert; Kristof Heitmann; Otto Von Estorff

2013-01-01T23:59:59.000Z

426

Prediction of underwater noise and far field propagation due to pile driving for offshore wind farms  

Science Journals Connector (OSTI)

Wind energy plays a key role toward a greener and more sustainable energy generation. Due to limited onshore areas and possible negative effects on human living space offshore wind parks become increasingly popular. During construction by pile driving however high levels of underwater sound emission are observed. To avoid negative effects on marine mammals and other sea life different approaches like e.g. bubble curtains or cofferdams are currently investigated to cut down the sound pressure levels. In order to predict the expected underwater noise both with and without sound damping measures numerical simulation models are needed to avoid complex and costly offshore tests. Within this contribution possible modeling strategies for the prediction of underwater noise due to pile driving are discussed. Different approaches are shown for the direct adjacencies of the pile and for the far field sound propagation. The effectivity of potential noise mitigation measures is investigated using a detailed finite element model of the surroundings of the pile. The far field propagation in the kilohertz range at distances of several kilometer from the pile on the other hand is computed by a model based on wavenumber integration. Finally the model validation with corresponding offshore tests is addressed.

Stephan Lippert; Tristan Lippert; Kristof Heitmann

2013-01-01T23:59:59.000Z

427

Vibration and rattle impact due to low frequency noise investigated at Dulles airport  

Science Journals Connector (OSTI)

A noise study was conducted at Washington Dulles International Airport to further investigate the noise and vibration impact of thrust reversers and start of takeoff roll on communities near runways. Two different houses located on the airport property were instrumented with outdoor and indoor microphones and accelerometers mounted inside on walls windows and floor. This presentation will discuss both the experimental design and data obtained from the two different structures. Correlations between plane types outdoor signatures and acceleration levels are considered. The outdoor signatures and acceleration levels are used to investigate the conditions under which rattle of a loosely coupled window is observed. Additionally the design of a subsequent subjective study to examine the effects of rattle on human perception will be discussed. The combination of the objective measurements with the results of the subjective study is intended to give a better understanding of community impact due to airport noise. [Work is supported by the Federal Aviation Administration and the Exploratory and Foundational Program of the Applied Research Laboratory Penn State University.

2005-01-01T23:59:59.000Z

428

In situ measurement of noise of induced?draft fans in a power plant stack  

Science Journals Connector (OSTI)

Induced?draft fans are commonly the most annoying sources of community noise associated with fossil?fuel power plants. The low frequency tones generated by the fans are usually radiated to the community from the top of a tall stack. Measurements of the tone levels in the community are hampered by environmental effects such as strong wind and thermal gradients. Measurements within the flue gas ducting are therefore desirable. However the flue gas environment is hostile to microphones due to elevated temperatures particulates and the presence of gas flow. The interpretation of in?duct data is complicated by the possible effects of standing waves and cross modes in the duct and turbulence generated noise. The recent installation of a dissipative?reactive muffler in a coal?fired plant offered the opportunity to (1) investigate techniques for measuring noise in stacks (2) evaluate the performance of the muffler under operating conditions and (3) check the in?stack results against limited farfield data. Good agreement was obtained between reductions in tone levels measured in the stack and in the community.

A. R. Thompson; M. A. Theobald; Alex Simich

1979-01-01T23:59:59.000Z

429

Using phase information to enhance speckle noise reduction in the ultrasonic NDE of coarse grain materials  

SciTech Connect

Materials with a coarse grain structure are becoming increasingly prevalent in industry due to their resilience to stress and corrosion. These materials are difficult to inspect with ultrasound because reflections from the grains lead to high noise levels which hinder the echoes of interest. Spatially Averaged Sub-Aperture Correlation Imaging (SASACI) is an advanced array beamforming technique that uses the cross-correlation between images from array sub-apertures to generate an image weighting matrix, in order to reduce noise levels. This paper presents a method inspired by SASACI to further improve imaging using phase information to refine focusing and reduce noise. A-scans from adjacent array elements are cross-correlated using both signal amplitude and phase to refine delay laws and minimize phase aberration. The phase-based and amplitude-based corrected images are used as inputs to a two-dimensional cross-correlation algorithm that will output a weighting matrix that can be applied to any conventional image. This approach was validated experimentally using a 5MHz array a coarse grained Inconel 625 step wedge, and compared to the Total Focusing Method (TFM). Initial results have seen SNR improvements of over 20dB compared to TFM, and a resolution that is much higher.

Lardner, Timothy; Gachagan, Anthony [Centre for Ultrasonic Engineering, University of Strathclyde, Glasgow, G1 1XW (United Kingdom); Li, Minghui [School of Engineering, University of Glasgow, Glasgow, G12 8QQ (United Kingdom)

2014-02-18T23:59:59.000Z

430

Impacts of Western Area Power Administration`s power marketing alternatives on air quality and noise  

SciTech Connect

The Western Area Power Administration, which is responsible for marketing electricity produced at the hydroelectric power-generating facilities operated by the Bureau of Reclamation on the Upper Colorado River, has proposed changes in the levels of its commitment (sales) of long-term firm capacity and energy to its customers. This report describes (1) the existing conditions of air resources (climate and meteorology, ambient air quality, and acoustic environment) of the region potentially affected by the proposed action and (2) the methodology used and the results of analyses conducted to assess the potential impacts on air resources of the proposed action and the commitment-level alternatives. Analyses were performed for the potential impacts of both commitment-level alternatives and supply options, which include combinations of electric power purchases and different operational scenarios of the hydroelectric power-generating facilities.

Chun, K.C.; Chang, Y.S.; Rabchuk, J.A.

1995-05-01T23:59:59.000Z

431

WHAT DO THREAT LEVELS AND RESPONSE LEVELS MEAN? THREAT LEVELS  

E-Print Network (OSTI)

WHAT DO THREAT LEVELS AND RESPONSE LEVELS MEAN? THREAT LEVELS: The UK Threat Level is decided by the Government's Joint Terrorism Analysis Centre (JTAC). It is the system to assess the threat to the UK from Threat Levels: Low - an attack is unlikely Moderate - an attack is possible, but not likely Substantial

Edinburgh, University of

432

Photoacoustic optical properties at UV, VIS, and near IR wavelengths for laboratory generated and winter time ambient urban aerosols  

SciTech Connect

We present the laboratory and ambient photoacoustic (PA) measurement of aerosol light absorption coefficients at ultraviolet wavelength (i.e., 355 nm) and compare with measurements at 405, 532, 870, and 1047 nm. Simultaneous measurements of aerosol light scattering coefficients were achieved by the integrating reciprocal nephelometer within the PA's acoustic resonator. Absorption and scattering measurements were carried out for various laboratory generated aerosols, including salt, incense, and kerosene soot to evaluate the instrument calibration and gain insight on the spectral dependence of aerosol light absorption and scattering. Ambient measurements were obtained in Reno, Nevada, between 18 December 2009 and 18 January 2010. The measurement period included days with and without strong ground level temperature inversions, corresponding to highly polluted (freshly emitted aerosols) and relatively clean (aged aerosols) conditions. Particulate matter (PM) concentrations were measured and analyzed with other tracers of traffic emissions. The temperature inversion episodes caused very high concentration of PM{sub 2.5} and PM{sub 10} (particulate matter with aerodynamic diameters less than 2.5 {mu}m and 10 {mu}m, respectively) and gaseous pollutants: carbon monoxide (CO), nitric oxide (NO), and nitrogen dioxide (NO{sub 2}). The diurnal change of absorption and scattering coefficients during the polluted (inversion) days increased approximately by a factor of two for all wavelengths compared to the clean days. The spectral variation in aerosol absorption coefficients indicated a significant amount of absorbing aerosol from traffic emissions and residential wood burning. The analysis of single scattering albedo (SSA), Angstrom exponent of absorption (AEA), and Angstrom exponent of scattering (AES) for clean and polluted days provides evidences that the aerosol aging and coating process is suppressed by strong temperature inversion under cloudy conditions. In general, measured UV absorption coefficients were found to be much larger for biomass burning aerosol than for typical ambient aerosols.

Gyawali, Madhu S.; Arnott, W. Patrick; Zaveri, Rahul A.; Song, Chen; Moosmuller, H.; Liu, Li; Mishchenko, M.; Chen, L-W A.; Green, M.; Watson, J. G.; Chow, J. C.

2012-03-08T23:59:59.000Z

433

NETL: Ambient Monitoring - Contribution of Semi-volatile Organic Material  

NLE Websites -- All DOE Office Websites (Extended Search)

Semi-volatile Organics in PM Semi-volatile Organics in PM This project is a cooperative effort between Brigham Young University (BYU) and researchers from the DOE-NETL Office of Science and and Engineering Research to determine the contribution of semi-volatile particulate organic compounds (SVOC) to total ambient suspended fine particulate mass at the NETL-Pittsburgh air monitoring facility. Project funding comes from DOE‘s University Coal Research (UCR) program. The hypothesis of the project is that fine particulate mass will be significantly under-determined in urban environments using single filter samplers such as the PM2.5 Federal Reference Method (FRM) because of the loss of semi-volatile organic compounds (SVOC) from the particles during sampling and storage. It is postulated that fine particulate mass, including the semi-volatile fine particulate organic species, are an appropriate surrogate for the components of fine particles which are associated with observed mortality and morbidity effects in epidemiological studies. Further, it is postulated that the most important fraction of the semi-volatile organic material with respect to exacerbation of health problems will be semi-volatile secondary compounds formed from reactions of volatile organic material with ozone and nitrogen oxides. Under-determination of these semi-volatile species will tend to over emphasize the importance of non-volatile fine particulate components such as sulfate or may reduce the significance of correlations with measured health effects.

434

NETL: Ambient Monitoring - Southern Fine Particulate Monitoring Project  

NLE Websites -- All DOE Office Websites (Extended Search)

Southern Fine Particulate Monitoring Project (SRI) Southern Fine Particulate Monitoring Project (SRI) Southern Research Institute (SRI), Birmingham, AL, is operating a research station in North Birmingham for monitoring fine particulate matter (PM2.5) that exists in that part of the Deep South. The station will be a core PM2.5 mass monitoring and chemical speciation station in the nationwide EPA PM2.5 network. As such, it will be a complement and supplement to DOE-NETL's other ongoing projects for monitoring fine particulate matter in the upper Ohio River valley. Locating additional monitoring equipment in the Deep South will fill an important gap in the national particulate monitoring effort. The region's topography, weather patterns, and variety of emission sources may affect the chemical make-up and airborne transport of fine particles in ways that are different than in other parts of the country. The project's results will support DOE's comprehensive program to evaluate ambient fine particulate matter through better understanding of the chemical and physical properties of these materials.

435

Characterization of noise from an isolated intermediate-sized wind turbine  

Science Journals Connector (OSTI)

Community-based wind power companies provide subscriptions to individual homeowners and businesses for power generated by a locally installed turbine. Typically such turbines are of an intermediate size such as the Vestas V20 120-kW turbines operated by the Cascade Community Wind Company in several locations within Washington state. This model turbine has a tower height of 80 feet with a rotor diameter of 60 ft. Each turbine is installed individually on leased land with no other turbines nearby. Noise measurements of a turbine located in Thorp WA were obtained in a variety of weather conditions. On several occasions with low to moderate wind speeds the turbine was stopped enabling the calculation of noise due to the turbine only. Results will be presented showing spectral content and sound pressure level contours for a range of wind speeds.

2014-01-01T23:59:59.000Z

436

Noise and microresonance of critical current in Josephson junction induced by Kondo trap states  

E-Print Network (OSTI)

We analyze the impact of trap states in the oxide layer of a superconducting tunnel junctions, on the fluctuation of the Josephson critical current, thus on coherence in superconducting qubits. Two mechanisms are usually considered: the current blockage due to repulsion at the occupied trap states, and the noise from electrons hopping across a trap. We extend previous studies of noninteracting traps to the case where the traps have on-site electron repulsion inside one ballistic channel. The repulsion not only allows the appropriate temperature dependence of 1/f noise, but also is a control to the coupling between the computational qubit and the spurious two-level systems inside the oxide dielectric. We use second order perturbation theory which allows to obtain analytical formulae for the interacting bound states and spectral weights, limited to small and intermediate repulsions. Remarkably, it still reproduces the main features of the model as identified from the Numerical Renormalization Group. We present ...

Ansari, Mohammad H

2011-01-01T23:59:59.000Z

437

The Theta Laser A Low Noise Chirped Pulse Laser  

E-Print Network (OSTI)

The Theta Laser A Low Noise Chirped Pulse Laser Dimitrios Mandridis dmandrid@creol.ucf.edu April 29, 2011 CREOL Affiliates Day 2011 #12;2 Objective: Frequency Swept (FM) Mode-locked Laser · Develop a frequency swept laser, · linear f-sweep, · uniform-intensity, · low noise, · with long-term stability

Van Stryland, Eric

438

Quantum error correction with degenerate codes for correlated noise  

SciTech Connect

We introduce a quantum packing bound on the minimal resources required by nondegenerate error-correction codes for any kind of noise. We prove that degenerate codes can outperform nondegenerate ones in the presence of correlated noise, by exhibiting examples where the quantum packing bound is violated.

Chiribella, Giulio [Perimeter Institute for Theoretical Physics, 31 Caroline St. North, Waterloo, Ontario N2L 2Y5 (Canada); Dall'Arno, Michele; D'Ariano, Giacomo Mauro; Macchiavello, Chiara; Perinotti, Paolo [Quit group, Dipartimento di Fisica 'A. Volta', via Bassi 6, I-27100 Pavia (Italy); INFN Sezione di Pavia, via Bassi 6, I-27100 Pavia (Italy)

2011-05-15T23:59:59.000Z

439

CHARACTERISTICS OF IMPULSIVE NOISE IN ELECTRICITY SUBSTATIONS Qingshan Shan1  

E-Print Network (OSTI)

CHARACTERISTICS OF IMPULSIVE NOISE IN ELECTRICITY SUBSTATIONS Qingshan Shan1 , Shahzad Bhatti1.shan@eee.strath.ac.uk, website: www.strath.ac.uk ABSTRACT Measurements of noise in an electricity substation are re- ported-voltage electricity substations, has discouraged electricity utility companies from deploying wireless technologies

Atkinson, Robert C

440

Trailing Edge Noise Model Applied to Wind Turbine Airfoils  

E-Print Network (OSTI)

flows, as well as the acoustic waves, using Computational Fluid Dynamics have become affordable thanksTrailing Edge Noise Model Applied to Wind Turbine Airfoils Franck Bertagnolio Risø-R-1633(EN) Risø Bertagnolio Title: Trailing Edge Noise Model Applied to Wind Turbine Airfoils Department: Wind Energy

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Poisson Distributed Noise Generation for Spiking Neural Applications  

E-Print Network (OSTI)

Poisson Distributed Noise Generation for Spiking Neural Applications Katherine Cameron, Thomas neural networks. However, it can be difficult to generate large truly random spike distributions which as randomly firing and a matlab generated Poisson distributed noise source. A hazard function shows

Cameron, Katherine

442

Noise properties of mutually sustained microwave-optoelectronic oscillator pair  

E-Print Network (OSTI)

Noise properties of mutually sustained microwave-optoelectronic oscillator pair E. Shumakher and G microwave-optoelectronic oscillator pair are described. The two oscillators have different spectral purities and exhibits low phase noise and highly suppressed spurious modes. Optoelectronic oscillators are employed

Eisenstein, Gadi

443

Coherent Quantum-Noise Cancellation for Optomechanical Sensors  

E-Print Network (OSTI)

Using a flowchart representation of quantum optomechanical dynamics, we design coherent quantum-noise-cancellation schemes that can eliminate the back-action noise induced by radiation pressure at all frequencies and thus overcome the standard quantum limit of force sensing. The proposed schemes can be regarded as novel examples of coherent feedforward quantum control.

Mankei Tsang; Carlton M. Caves

2010-08-17T23:59:59.000Z

444

Noise source identification techniques: simple to advanced applications  

E-Print Network (OSTI)

required. Practical application examples ranging from hearing aids to wind turbines are presented to optimise the noise emission from a wide range of products including vehicles, household goods and windNoise source identification techniques: simple to advanced applications K.B. Ginn and K. Haddad Br

Paris-Sud XI, Université de

445

Research paper From noise to pitch: Transient and sustained responses  

E-Print Network (OSTI)

Research paper From noise to pitch: Transient and sustained responses of the auditory evoked field a novel component of the auditory evoked field, which is elicited by a tran- sition from noise to pitch in the absence of a change in energy. It is referred to as the `pitch onset response'. To extend our

Cambridge, University of

446

White noise distribution theory for the Fermion system  

E-Print Network (OSTI)

In this paper, we give the white noise calculus for the Fermion system and prove the Fock expansion. Each continuous linear operator on Fermionic white noise functionals is uniquely represented by the series of integral kernel operators. This series is called the Fock expansion.

Yoshihito Shimada

2005-12-09T23:59:59.000Z

447

A Low Noise Readout Circuit for Integrated Electrochemical Biosensor Arrays  

E-Print Network (OSTI)

A Low Noise Readout Circuit for Integrated Electrochemical Biosensor Arrays Jichun Zhang, Nicholas 48823, USA {zhangjic, tromblyn, mason}@egr.msu.edu Abstract This paper presents a low noise electrochemical interface circuit that is tuned to the needs of protein-based biosensor arrays and compatible

Mason, Andrew

448

Environmental Noise and Nonlinear Relaxation in Biological Systems  

E-Print Network (OSTI)

We analyse the effects of environmental noise in three different biological systems: (i) mating behaviour of individuals of \\emph{Nezara viridula} (L.) (Heteroptera Pentatomidae); (ii) polymer translocation in crowded solution; (iii) an ecosystem described by a Verhulst model with a multiplicative L\\'{e}vy noise.

B. Spagnolo; D. Valenti; S. Spezia; L. Curcio; N. Pizzolato; A. A. Dubkov; A. Fiasconaro; D. Persano Adorno; P. Lo Bue; E. Peri; S. Colazza

2011-10-18T23:59:59.000Z

449

Recent Advances Related to SPDEs with Fractional Noise  

E-Print Network (OSTI)

band. This analogy extends naturally to other "colors" of noise. In signal theory and audio engineering.1) Research supported by a grant from the Natural Sciences and Engineering Research Council of Canada. #12]). The noise is a very important concept in engineering and physics, where it usually refers to anything

Balan, Raluca

450

Waveguide integrated low noise NbTiN nanowire single-photon detectors with milli-Hz dark count rate  

E-Print Network (OSTI)

Superconducting nanowire single-photon detectors are an ideal match for integrated quantum photonic circuits due to their high detection efficiency for telecom wavelength photons. Quantum optical technology also requires single-photon detection with low dark count rate and high timing accuracy. Here we present very low noise superconducting nanowire single-photon detectors based on NbTiN thin films patterned directly on top of Si3N4 waveguides. We systematically investigate a large variety of detector designs and characterize their detection noise performance. Milli-Hz dark count rates are demonstrated over the entire operating range of the nanowire detectors which also feature low timing jitter. The ultra-low dark count rate, in combination with the high detection efficiency inherent to our traveling wave detector geometry, gives rise to a measured noise equivalent power at the 10^(-20) W/Hz^(1/2) level.

Carsten Schuck; Wolfram H. P. Pernice; Hong X. Tang

2013-06-02T23:59:59.000Z

451

Numerical tools applied to power reactor noise analysis  

SciTech Connect

In this paper, the development of numerical tools allowing the determination of the neutron noise in power reactors is reported. These tools give the space-dependence of the fluctuations of the neutron flux induced by fluctuating properties of the medium in the 2-group diffusion approximation and in a 2-dimensional representation of heterogeneous systems. Some applications of these tools to power reactor noise analysis are then described. These applications include the unfolding of the noise source from the resulting neutron noise measured at a few discrete locations throughout the core, the study of the space-dependence of the Decay Ratio in Boiling Water Reactors, the noise-based estimation of the Moderator Temperature Coefficient of reactivity in Pressurized Water Reactors, the modeling of shell-mode core barrel vibrations in Pressurized Water Reactors, and the investigation of the validity of the point-kinetic approximation in subcritical systems. (authors)

Demaziere, C.; Pazsit, I. [Chalmers Univ. of Technology, Dept. of Nuclear Engineering, SE-412 96 Goeteborg (Sweden)

2006-07-01T23:59:59.000Z

452

Costs and benefits of noise control in the petroleum industry  

Science Journals Connector (OSTI)

Noise from industrial operations has become widely recognized as a potential hazard to health. industry labor and government share a common interest in assessing the hazard and reducing it to a socially acceptable risk. Achieving these ends requires the use of information about the amounts of noise exposure encountered the relation of exposure to risk and the costs of noise control required to achieve specified benefits. Such information pertaining specifically to the petroleum industry is the subject of this paper. We report here some estimates of benefits and costs aggregated for the petroleum industry. We define the benefits as reduced incidence of hearing damage in refinery workers in relation to certain existing and proposed Federal regulations. For such category of regulation we estimate the number of refinery workers now exposed to noise that exceeds the regulated amount and we estimate the national cost of reducing the noise to the regulated amount.

Robert D. Bruce

1975-01-01T23:59:59.000Z

453

Chronic effects of ambient air pollution on respiratory morbidities among Chinese children: a cross-sectional study in Hong Kong  

Science Journals Connector (OSTI)

The chronic health effects from exposure to ambient air pollution are still unclear. This study primarily aims ... the relationship between long-term exposure to ambient air pollution and respiratory morbidities ...

Yang Gao; Emily YY Chan; Liping Li; Patrick WC Lau; Tze Wai Wong

2014-02-01T23:59:59.000Z

454

A Policy Management System for Ambient Networks K. Jean and A. Galis, {kjean, agalis}@ee.ucl.ac.uk,  

E-Print Network (OSTI)

A Policy Management System for Ambient Networks K. Jean and A. Galis, {kjean, agalis of Ambient Networks necessitate a new dynamic, distributed policy management system. Existing policy management systems do not provide the required support for mobility, dynamicity and heterogeneity

Haddadi, Hamed

455

Ppb-level QEPAS NO2 sensor by use of electrical modulation cancellation method with a high power blue LED  

Science Journals Connector (OSTI)

Abstract A novel electrical modulation cancellation method (E-MOCAM) is proposed to suppress the background noise in the case of the excitation light source with a poor beam quality. For its practical implementation, an E-MOCAM based on-beam QEPAS NO2 sensor by use of a commercial high-power wide-stripe LED is developed. The E-MOCAM ultimately suppressed the background noise caused by the stray light by three orders of magnitude. A 1? detection limit of 1.3 ppb (part per billion by volume) was achieved at 1 s integration time in this experiment, which corresponds to a normalized noise equivalent absorption coefficient (NNEA) 4.2 × 10?9 W cm?1 Hz?1/2. A 9 h continuous on-line monitoring of ambient atmospheric NO2 was carried out on the campus of Shanxi University.

Huadan Zheng; Lei Dong; Xukun Yin; Xiaoli Liu; Hongpeng Wu; Lei Zhang; Weiguang Ma; Wangbao Yin; Suotang Jia

2015-01-01T23:59:59.000Z

456

PIANO DI RIQUALIFICAZIONE AMBIENTALE E PAESAGGISTICA DEL TERMOVALORIZZATORE DI DESIO TERMOVALORIZZATORE DI DESIO (MI) BRIANZA ENERGIA E AMBIENTE SPA  

E-Print Network (OSTI)

TERMOVALORIZZATORE DI DESIO (MI) ­ BRIANZA ENERGIA E AMBIENTE SPA Impianto di costruito negli anni '70 per lo

Columbia University

457

Nitrogen dioxide inside and outside 137 homes and implications for ambient air quality standards and health effects research  

Science Journals Connector (OSTI)

Nitrogen dioxide inside and outside 137 homes and implications for ambient air quality standards and health effects research ...

John D. Spengler; Colin P. Duffy; Richard. Letz; Theodore W. Tibbitts; Benjamin G. Ferris

1983-03-01T23:59:59.000Z

458

Reference Directions for a Sound Level Meter , M.R. Vaabenb  

E-Print Network (OSTI)

0 and 90 Reference Directions for a Sound Level Meter E. Aflaloa , M.R. Vaabenb , P. Pourtaua , D the requirements of the IEC 61672 standard on sound level meters taking into account noise incidence from level meter must be pointed at the source according to standard IEC 60651. The purpose of the paper

Paris-Sud XI, Université de

459

The MRI: A noise source of concern in the health care industry  

Science Journals Connector (OSTI)

Two recent trends in the development and use of magnetic resonance imaging (MRI) equipment have created challenges for acoustical engineers: (1) the trend toward more powerful MRI machines with greater magnetic field strengths and (2) the tendency of health care facilities to locate these machines which were previously located in basements or on grade on upper floors adjacent to (and in some cases above) other critical use areas. For newer 3?T MRI machines sound levels well over 100 dBA in the examination room are common. Along with these trends some equipment manufacturers are now providing design recommendations to address the issues of airborne and structure?borne noise within hospitals and clinics. In addition MRI manufacturers sometimes have strict requirements for acceptable levels of building vibration from other sources to prevent potential image quality problems. This paper discusses experience gained during the course of addressing MRI?generated noise on several projects. Data for airborne sound levels measured inside MRI rooms and adjacent rooms and vibration levels measured below MRI units will be presented.

2003-01-01T23:59:59.000Z

460

Intrinsically Disordered Proteins and Conformational Noise: Implications in Gita Mahmoudabadi1  

E-Print Network (OSTI)

1 Intrinsically Disordered Proteins and Conformational Noise: Implications New York, NY 10027 Key words: Intrinsically disordered proteins, noise: Conformational noise and state-switching #12;2 Abstract Intrinsically disordered proteins

Rangarajan, Govindan

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Fast noise in the Landau-Zener theory RID B-5617-2009  

E-Print Network (OSTI)

We study the influence of a fast noise on Landau-Zener transitions. We demonstrate that a fast colored noise much weaker than the conventional white noise can produce transitions itself or can change substantially the Landau-Zener transition...

Pokrovsky, Valery L.; Sinitsyn, NA.

2003-01-01T23:59:59.000Z

462

E-Print Network 3.0 - absolute johnson noise Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

johnson noise Search Powered by Explorit Topic List Advanced Search Sample search results for: absolute johnson noise Page: << < 1 2 3 4 5 > >> 1 JOHNSON NOISE THERMOMETRY USING A...

463

The design, construction, and testing of an experimental reverberation chamber  

E-Print Network (OSTI)

. The reverberation time was acceptable in terms of future experimentation in sound power deter- mination and acoustic absorption. 2, The background noise evaluation determined that the ambient noise level was well below what was recommended by the standards.... The reverberation time was acceptable in terms of future experimentation in sound power deter- mination and acoustic absorption. 2, The background noise evaluation determined that the ambient noise level was well below what was recommended by the standards...

Smahlik, Henry Joseph

2012-06-07T23:59:59.000Z

464

Quantum Noise as an Entanglement Meter  

E-Print Network (OSTI)

Entanglement entropy, which is a measure of quantum correlations between separate parts of a many-body system, has emerged recently as a fundamental quantity in broad areas of theoretical physics, from cosmology and field theory to condensed matter theory and quantum information. The universal appeal of the entanglement entropy concept is related, in part, to the fact that it is defined solely in terms of the many-body density matrix of the system, with no relation to any particular observables. However, for the same reason, it has not been clear how to access this quantity experimentally. Here we derive a universal relation between entanglement entropy and the fluctuations of current flowing through a quantum point contact (QPC) which opens a way to perform a direct measurement of entanglement entropy. In particular, by utilizing space-time duality of 1d systems, we relate electric noise generated by opening and closing the QPC periodically in time with the seminal S = 1/3 log L prediction of conformal field theory.

Israel Klich; Leonid Levitov

2008-06-11T23:59:59.000Z

465

Spectral resolvability of iterated rippled noise  

Science Journals Connector (OSTI)

A forward?masking experiment was used to estimate the spectral ripple of iterated rippled noise (IRN) that is possibly resolved by the auditory system. Tonal signals were placed at spectral peaks and valleys of IRN maskers for a wide variety of IRN conditions that included different delays number of iterations and stimulus durations. The differences in the forward?masked thresholds of tones at spectral peaks and valleys were used to estimate spectral resolvability and these results were compared to estimates obtained from a gamma?tone filter bank. The IRN spectrum has spectral peaks that are harmonics of the reciprocal of the delay used to generate IRN stimuli. As the number of iterations in the generation of IRN stimuli increases so does the difference in the spectral peak?to?valley ratio. For high number of iterations long delays and long durations evidence for spectral resolvability existed up to the 6th harmonic. For all other conditions spectral resolvability appeared to disappear at harmonics lower than the 6th or was not measurable at all. These data will be discussed in terms of the role spectral resolvability might play in processing the pitch pitch strength and timbre of IRN stimuli. [Work supported by a grant from NIDCD.

2005-01-01T23:59:59.000Z

466

Robust Shot Noise Measurement for Continuous Variable Quantum Key Distribution  

E-Print Network (OSTI)

We study a practical method to monitor in real-time the behavior of a Continuous Variable Quantum Key Distribution (CVQKD) system, and especially the shot noise measurement procedure, for the presence of an eavesdropper. The amount of secret key that can be extracted from the raw statistics of a CVQKD system depends strongly on a shot noise estimate since this quantity affects in particular the computation of the excess noise (i.e. noise in excess of the shot noise) added by an eavesdropper on the quantum channel. Some powerful quantum hacking attacks rely on faking the estimated value of the shot noise to hide an intercept-and-resend eavesdropping strategy, notably by targeting the calibration of the system, the saturation of the homodyne detection device or the wavelength dependency of some optical components. We describe a new countermeasure that consists in fairly general statistical tests build on top of an existing real-time shot-noise measurement technique and show that it is able to defeat all these attacks.

Sébastien Kunz-Jacques; Paul Jouguet

2014-06-29T23:59:59.000Z

467

Mechanical Efficiency and Noise Reduction of Segmented Stator Vanes  

Science Journals Connector (OSTI)

Model experiments indicating the possibility of several decibels of noise reduction with small change of mechanical efficiency in axial flow compressors using segmented stator vanes have been reported [J. Acoust. Soc. Amer. 47 111 (A) (1970)]. Compared with straight?edged vanes the serrated vanes provide 2–5 dB of noise reduction and no change in efficiency at the design conditions. Changing relative numbers of rotor blades and stator vanes gives either improved efficiency and no noise reduction or reduced efficiency and greater noise reduction. Off?design flow angles present a complicated pattern of results but in general the serrated vanes compared with straight?edged vanes are equally efficient and have increased broad?band noise but less blade?passage?frequency noise. As a noise reduction mechanism for turbine engines it may be used with most other techniques and the effects are likely to be additive; however its maximum benefit is likely to be about 5 dB.

T. F. W. Embleton; G. J. Thiessen

1971-01-01T23:59:59.000Z

468

Studies of RF Noise Induced Bunch Lengthening at the LHC  

SciTech Connect

Radio Frequency (RF) noise induced bunch lengthening can strongly affect the Large Hadron Collider (LHC) performance through luminosity reduction, particle loss, and other effects. This work presents measurements from the LHC that better quantify the relationship between the RF noise and longitudinal emittance blowup and identify the performance limiting RF components. The experiments presented in this paper confirmed the predicted effects on the LHC bunch length growth. Dedicated measurements were conducted in the LHC to gain insight in the effect of RF noise to the longitudinal beam diffusion. It was evident that the growth rate of the bunch length is strongly related to the accelerating voltage phase noise power spectral density around f{sub s} + kf{sub rev}, as predicted in [4]. The noise threshold for 2.5 ps/hr growth was estimated to -101 dBc/Hz (SSB flat noise spectral density from f{sub s} to the edge of the closed loop bandwidth). A 9 dB margin is achieved with the current RF configuration and the BPL on. With this formalism it is now possible to estimate the effect of different operational and technical RF configurations on the LHC beam diffusion. This formalism could also be useful for the design of future RF systems and the budgeting of the allowed noise.

Mastorides, T.; Rivetta, C.; Fox, J.D.; Baudrenghien, P.; Butterworth, A.; Molendijk, J.; /SLAC /CERN

2011-08-17T23:59:59.000Z

469

Assessment of radon concentration and external gamma radiation level in the environs of Narwapahar uranium mine, India and its radiological significance  

Science Journals Connector (OSTI)

In the environs of uranium mining, milling and processing facilities and in the uranium mineralized terrain, a little higher ambient radon concentration and gamma radiation level may be expected in comparison ...

B. K. Rana; R. M. Tripathi; J. S. Meena…

2011-11-01T23:59:59.000Z

470

Frequency and amplitude shifts in the whistle vocalizations of bottlenose dolphins in response to anthropogenic noise  

E-Print Network (OSTI)

and amplitude; and (b) "quiet", "interval" and "one-third octave" background noise. FIG. 7. Kruskal-Wallis results for (a) "one-third octave" background noise, and (b) "interval" background noise in quiet and noisy categories. . FIG. 8, Bar graph of (a...) "interval" background noise, (b) "one-third octave" background noise, and (c) "quiet" background noise, in quiet and noisy categories. . . . . . . . . . . . . . . ?. .. 50 FIG. 9. Kruskal-Wallis results for (a) whistle mean frequency, (b) peak frequency...

Candelaria-Ley, Roxanne Inez

2012-06-07T23:59:59.000Z

471

Carbon dioxide capture under ambient conditions using 2-chloroethylamine  

Science Journals Connector (OSTI)

This is the first case applying 2-haloethylamine to CO2 capture. The prospect of global warming and the urgent need to reduce atmospheric concentration of carbon dioxide has prompted actions at many levels. The c...

Junhua Wang; Xiqin Zhang; Yun Zhou

2011-12-01T23:59:59.000Z

472

Generating long streams of $1/f^alpha$ noise  

E-Print Network (OSTI)

We review existing methods for generating long streams of 1/f^alpha noise ($0generator (white outside some bounds) in order to generate very long streams of noise without an exhaustive computer memory load. For $\\alpha=2$ it is shown why the process is equivalent to a random-walk and can be obtained simply by a first order filtering of white noise. As soon as $\\alphagenerators with $\\alpha>2$. The software is available from http://planck.lal.in2p3.fr/article.php3?id\\_article=8

S. Plaszczynski

2005-10-04T23:59:59.000Z

473

Reactor noise analysis applications in NPP I and C systems  

SciTech Connect

Reactor noise analysis techniques are used in many NPPs on a routine basis as 'inspection tools' to get information on the dynamics of reactor processes and their instrumentation in a passive, non-intrusive way. The paper discusses some of the tasks and requirements an NPP has to take to implement and to use the full advantages of reactor noise analysis techniques. Typical signal noise analysis applications developed for the monitoring of the reactor shutdown system and control system instrumentation of the Candu units of Ontario Power Generation and Bruce Power are also presented. (authors)

Gloeckler, O. [International Atomic Energy Agency, Wagramer Strosse 5, A-1400 Vienna, Austria Ontario Power Generation, 230 Westney Road South, Ajax, Ont. L1S 7R3 (Canada)

2006-07-01T23:59:59.000Z

474

CORRELATION PROPERTIES OF QUANTIZATION NOISE Peter Kabal  

E-Print Network (OSTI)

that shows that a quantizer (uniform or not) which has quantizer break points midway between output lev- els which lie midway between output levels. The minimum dis- tance property is a necessary requirement

Kabal, Peter

475

High-frequency intensity noise of lead-salt diode lasers  

Science Journals Connector (OSTI)

The high-frequency intensity noise spectra of mid-infrared diode lasers have been investigated. Theoretical estimates are compared with experimental results of spectral noise...

Fischer, H; Tacke, M

1991-01-01T23:59:59.000Z

476

Acoustical and Noise Control Criteria and Guidelines for Building Design and Operations  

E-Print Network (OSTI)

Noise, vibration and acoustical design, construction, commissioning and operation practices influence building cost, efficiency, performance and effectiveness. Parameters for structural vibration, building systems noise, acoustics and environmental...

Evans, J. B.; Himmel, C. N.

477

Numerical Investigation of Flow Induced Noise in a Simplified HVAC Duct with OpenFOAM.  

E-Print Network (OSTI)

?? Due to the growing demand for comfort, the noise generated by HVAC components should be considered by the designers. Flow induced noise is one… (more)

Wang, Cong

2013-01-01T23:59:59.000Z

478

When Must EPA Set Ambient Air Quality Standards - Looking Back at NRDC v. Train  

E-Print Network (OSTI)

re- specting control of lead or other air pollutant" (citingcontrol the pollutant 5 7 and-si- multaneously with the issuance of the criteria-propose primary and secondary ambient air

Oren, Craig N.

2012-01-01T23:59:59.000Z

479

Electron yield soft X-ray photoabsorption spectroscopy under normal ambient-pressure conditions  

Science Journals Connector (OSTI)

Soft X-ray photoabsorption spectroscopy under normal ambient-pressure conditions using electron yield detection was demonstrated. This technique provided unambiguous photoabsorption data for hydrated transition-metal compounds and identified the different chemical states of cobalt ions.

Tamenori, Y.

2013-03-16T23:59:59.000Z

480

Single- and few-layer graphene by ambient pressure chemical vapor deposition on nickel  

E-Print Network (OSTI)

An ambient pressure chemical vapor deposition (APCVD) process is used to fabricate graphene based films consisting of one to several graphene layers across their area. Polycrystalline Ni thin films are used and the graphene ...

Reina Ceeco, Alfonso

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ambient noise levels" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Off-design performance of a chemical looping combustion (CLC) combined cycle: effects of ambient temperature  

Science Journals Connector (OSTI)

The present work investigates the influence of ambient temperature on the steady-state off-design thermodynamic performance of a chemical looping combustion (CLC) combined cycle. A sensitivity analysis...

Jinling Chi; Bo Wang; Shijie Zhang; Yunhan Xiao

2010-02-01T23:59:59.000Z

482

E-Print Network 3.0 - ambiente para planejamento Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

para a construo de modelos... a anlise de modos de falhas, suas causas e efeitos: FMEA, FMECA, etc. 10) Ambientes para a construo de... IEC, 1995b. SANT'ANNA, N. Um...

483

E-Print Network 3.0 - ambiental territorio urbano Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Magistrale Sede isc. Sede alt. Voto laurea Data nascita 1 783078 I-INGEGNERIA CIVILE MI CO 110 26091989 Summary: -INGEGNERIA PER L'AMBIENTE E IL TERRITORIO MI 110 06081988...

484

E-Print Network 3.0 - ambient magnetic field Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

by Explorit Topic List Advanced Search Sample search results for: ambient magnetic field Page: << < 1 2 3 4 5 > >> 1 The Astrophysical Journal, 623:L89L92, 2005 April 20 2005....

485

E-Print Network 3.0 - ao meio ambiente Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

meio ambiente Page: << < 1 2 3 4 5 > >> 1 Retirado de http:www.cfbio.gov.brlegislacao.php em 05052011. RESOLUO N 213, DE 20 DE MARO DE 2010. Summary: , percias,...

486

Effect of the shutdown of a large coal fired power plant on ambient mercury species  

E-Print Network (OSTI)

Effect of the shutdown of a coal-fired power plant on urbanof the shutdown of a large coal-fired power plant on ambientof the shutdown of a large coal-fired power plant on ambient

Wang, Yungang

2014-01-01T23:59:59.000Z

487

When Must EPA Set Ambient Air Quality Standards - Looking Back at NRDC v. Train  

E-Print Network (OSTI)

See National Ambi- ent Air Quality Standards for Lead, 73I: Can EPA Revive It Air Quality Standards, 29 ENVnL. L.and Secondary Ambient Air Quality Standards for Lead, 43

Oren, Craig N.

2012-01-01T23:59:59.000Z

488

E-Print Network 3.0 - ambiente web para Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

web para Search Powered by Explorit Topic List Advanced Search Sample search results for: ambiente web para Page: << < 1 2 3 4 5 > >> 1 Ajudando Professores a Fazer seu Dever de...

489

E-Print Network 3.0 - ambient air pollution--comparison Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

Search Powered by Explorit Topic List Advanced Search Sample search results for: ambient air pollution--comparison Page: << < 1 2 3 4 5 > >> 1 IV. Summary of Core Environmental...

490

E-Print Network 3.0 - ambient nitrogen dioxide Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Search Sample search results for: ambient nitrogen dioxide Page: << < 1 2 3 4 5 > >> 1 Air Pollution Grant Ideas Possible air pollutants to study: SO2, H2S, NO2, NH3, CO, CO2,...

491

A LANDSCAPE POTENTIAL CHARACTERIZATION: SPATIAL TEMPLATE OF PEDESTRIAN AMBIENT FIELDS WITHIN THE  

E-Print Network (OSTI)

A LANDSCAPE POTENTIAL CHARACTERIZATION: SPATIAL TEMPLATE OF PEDESTRIAN AMBIENT FIELDS WITHIN delineate ambiences with identifiable characteristics, thus characterizing landscape perception-sensorial planning and design process. Keywords Landscape analysis, open spaces, isovist, sensory Digital Terrain

Paris-Sud XI, Université de

492

E-Print Network 3.0 - ambiental em uma Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Sciences 16 Um MetaAmbiente para Suporte a Construo Sistemtica de Sergio Crespo , Carlos Jos P. de Lucena, and A. v. Staa Summary: frameworks, pois estes possuem tambm uma...

493

Calibrating spectral estimation for the LISA Technology Package with multichannel synthetic noise generation  

SciTech Connect

The scientific objectives of the LISA Technology Package experiment on board of the LISA Pathfinder mission demand accurate calibration and validation of the data analysis tools in advance of the mission launch. The level of confidence required in the mission outcomes can be reached only by intensively testing the tools on synthetically generated data. A flexible procedure allowing the generation of a cross-correlated stationary noise time series was set up. A multichannel time series with the desired cross-correlation behavior can be generated once a model for a multichannel cross-spectral matrix is provided. The core of the procedure comprises a noise coloring, multichannel filter designed via a frequency-by-frequency eigendecomposition of the model cross-spectral matrix and a subsequent fit in the Z domain. The common problem of initial transients in a filtered time series is solved with a proper initialization of the filter recursion equations. The noise generator performance was tested in a two-dimensional case study of the closed-loop LISA Technology Package dynamics along the two principal degrees of freedom.

Ferraioli, Luigi; Hueller, Mauro; Vitale, Stefano; Heinzel, Gerhard; Hewitson, Martin; Monsky, Anneke; Nofrarias, Miquel [University of Trento and INFN, via Sommarive 14, 38123 Povo (Trento) (Italy); Albert-Einstein-Institut, Max-Planck-Institut fuer, Gravitationsphysik und Universitaet Hannover, Callinstrasse 38, 30167 Hannover (Germany)

2010-08-15T23:59:59.000Z

494

Quantum noise of non-ideal Sagnac speed meter interferometer with asymmetries  

E-Print Network (OSTI)

The speed meter concept has been identified as a technique that can potentially provide laser-interferometric measurements at a sensitivity level which surpasses the Standard Quantum Limit (SQL) over a broad frequency range. As with other sub-SQL measurement techniques, losses play a central role in speed meter interferometers and they ultimately determine the quantum noise limited sensitivity that can be achieved. So far in the literature, the quantum noise limited sensitivity has only been derived for lossless or lossy cases using certain approximations (for instance that the arm cavity round trip loss is small compared to the arm cavity mirror transmission). In this article we present a generalised, analytical treatment of losses in speed meters that allows accurate calculation of the quantum noise limited sensitivity of Sagnac speed meters with arm cavities. In addition, our analysis allows us to take into account potential imperfections in the interferometer such as an asymmetric beam splitter or differences of the reflectivities of the two arm cavity input mirrors. Finally,we use the examples of the proof-of-concept Sagnac speed meter currently under construction in Glasgow and a potential implementation of a Sagnac speed meter in the Einstein Telescope (ET) to illustrate how our findings affect Sagnac speed meters with meter- and kilometre-long baselines.

S. L. Danilishin; C. Graef; S. S. Leavey; J. Hennig; E. A. Houston; D. Pascucci; S. Steinlechner; J. Wright; S. Hild

2014-12-02T23:59:59.000Z

495

Minimizing manganin/system noise for potential use in small geometry experiments  

SciTech Connect

Manganin gauges are piezo resistive devices often used for pressure measurements on larger, planer impact experiments. These gauges function in this capacity as a result of their ability to change resistance in a consistent fashion relative to the pressure exerted against them. Pressures to 400 kbar have been reliably recorded (H.C. Vantine et al.[1]). Because the mini-manganin is significantly physically smaller than other types, there has been interest in the ability to place these gauges on small geometry (detonator) type experiments. Of primary concern is that the detonator shock front has significant curvature associated with it--especially at small geometries--and that this curvature will cause unknown distortion (stretching) of the manganin gauge and therefore may indicate erroneous data. A problem encountered while configuring this experiment was noise as a result of the proximity and high current levels of the fireset to the manganin gauge. Initial results indicate noise on the order of 130 mV peak-to-peak (p-p) and running as long as the CVR signal from the ringdown charge voltage of 775 V. These noise problems significantly worsened while discharging the full charge voltage of 1500 V on the fireset through the chip slapper.

Phillips, D; May, C; Vandersall, K; Garcia, F

2008-10-02T23:59:59.000Z

496

Low noise charge sensitive preamplifier DC stabilized without a physical resistor  

DOE Patents (OSTI)

The invention is a novel charge sensitive preamplifier (CSP) which has no resistor in parallel with the feedback capacitor. No resetting circuit is required to discharge the feedback capacitor. The DC stabilization of the preamplifier is obtained by means of a second feedback loop between the preamplifier output and the common base transistor of the input cascode. The input transistor of the preamplifier is a Junction Field Transistor (JFET) with the gate-source junction forward biased. The detector leakage current flows into this junction. This invention is concerned with a new circuit configuration for a charge sensitive preamplifier and a novel use of the input Field Effect Transistor of the CSP itself. In particular this invention, in addition to eliminating the feedback resistor, eliminates the need for external devices between the detector and the preamplifier, and it eliminates the need for external circuitry to sense the output voltage and reset the CSP. Furthermore, the noise level of the novel CSP is very low, comparable with the performance achieved with other solutions. Experimental tests prove that this configuration for the charge sensitive preamplifier permits an excellent noise performance at temperatures including room temperature. An equivalent noise charge of less than 20 electrons r.m.s. has been measured at room temperature by using a commercial JFET as input device of the preamplifier.

Bertuccio, Giuseppe (Brianza, IT); Rehak, Pavel (Patchogue, NY); Xi, Deming (Beijing, CN)

1994-09-13T23:59:59.000Z

497

Low noise charge sensitive preamplifier DC stabilized without a physical resistor  

DOE Patents (OSTI)

The invention is a novel charge sensitive preamplifier (CSP) which has no resistor in parallel with the feedback capacitor. No resetting circuit is required to discharge the feedback capacitor. The DC stabilization of the preamplifier is obtained by means of a second feedback loop between the preamplifier output and the common base transistor of the input cascode. The input transistor of the preamplifier is a Junction Field Transistor (JFET) with the gate-source junction forward biased. The detector leakage current flows into this junction. This invention is concerned with a new circuit configuration for a charge sensitive preamplifier and a novel use of the input Field Effect Transistor of the CSP itself. In particular this invention, in addition to eliminating the feedback resistor, eliminates the need for external devices between the detector and the preamplifier, and it eliminates the need for external circuitry to sense the output voltage and reset the CSP. Furthermore, the noise level of the novel CSP is very low, comparable with the performance achieved with other solutions. Experimental tests prove that this configuration for the charge sensitive preamplifier permits an excellent noise performance at temperatures including room temperature. An equivalent noise charge of less than 20 electrons r.m.s. has been measured at room temperature by using a commercial JFET as input device of the preamplifier. 6 figs.

Bertuccio, G.; Rehak, P.; Xi, D.

1994-09-13T23:59:59.000Z

498

A three-dimensional numerical model of dry convection in an ambient wind field  

E-Print Network (OSTI)

effects of the ambient wind field on convection. Nost of the numerical results are shown to correspond to empirical observations, while some results are unexpected but reasonable. Nechanical and thermal energy equations have been developed... to investigate the effects on convection of an The citations on the following pages follow the tyl of th J* J of ~At * h ' f ambient wind with a vertical shear He also examined the energy interactions between convective flow and nean flows. There were many...

Burgeson, John Carl

2012-06-07T23:59:59.000Z

499

The effects of an ambient salinity gradient on the dilution of dense brine jets  

E-Print Network (OSTI)

THE EFFECTS OF AN AMBIENT SALINITY GRADIENT ON THE DILUTION OF DENSE BRINE JETS A Thesis by GARY WAYNE MCCULLOUGH Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE December 1986 Major Subject: Ocean Engineering THE EFFECTS OF AN AMBIENT SALINITY GRADIENT ON THE DILUTION OF DENSE BRINE JETS A Thesis by GARY NAYNE MCCULLOUGH Approved as to style and content by: Robert E. Randall (Chair of Committee...

McCullough, Gary Wayne

2012-06-07T23:59:59.000Z

500

Economizer control assembly for regulating the volume flow of outdoor ambient air  

SciTech Connect

An economizer assembly is disclosed wherein a sliding door is utilized for covering an outdoor ambient air opening allowing outdoor ambient air flow into a space to be conditioned. A motor shaft arrangement connected via a rotating drive rod is utilized to slidably displace the door to any position necessary to effectively regulate air flow. The utilization of this economizer control arrangement with a rooftop type air conditioning unit is further disclosed.

Michaels, D.D. Jr.

1984-10-23T23:59:59.000Z