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1

ARM - Measurement - Atmospheric pressure  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

pressure pressure ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Atmospheric pressure The pressure exerted by the atmosphere as a consequence of gravitational attraction exerted upon the "column" of air lying directly above the point in question. Categories Atmospheric State Instruments The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each instrument for a list of all available measurements, including those recorded for diagnostic or quality assurance purposes. ARM Instruments SONDE : Balloon-Borne Sounding System CO2FLX : Carbon Dioxide Flux Measurement Systems ECOR : Eddy Correlation Flux Measurement System

2

Atmospheric Pressure Deposition for Electrochromic Windows |...  

Broader source: Energy.gov (indexed) [DOE]

Atmospheric Pressure Deposition for Electrochromic Windows Atmospheric Pressure Deposition for Electrochromic Windows Emerging Technologies Project for the 2013 Building...

3

CDIAC Atmospheric Pressure Data Sets  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Atmospheric Pressure Atmospheric Pressure CDIAC Climate Holdings Containing Atmospheric Pressure Data Global Data Sets Data Set Name Investigators Data Type/Format Period of Record Global Historical Climatology Network (GHCN); Vs. 1 (CDIAC NDP-041) R.S. Vose et al. Surface stations; monthly mean sea-level pressure Varies by station; through 1990 Extended Edited Synoptic Cloud Reports from Ships and Land Stations Over the Globe, 1952-2009 (CDIAC NDP-026C) C.J. Hahn, S.G. Warren, and R. Eastman Six-hourly synoptic observations of sea-level pressure Land 1971-2009; Ocean 1952-2008 Global Historical Climatology Network (GHCN); Vs. 2 (Note: the above link takes you to NOAA's National Climatic Data Center website.) R.S. Vose et al. Surface stations; monthly mean sea-level pressure Varies by station; some through most recent month

4

atmospheric pressure | OpenEI  

Open Energy Info (EERE)

pressure pressure Dataset Summary Description (Abstract):Atmospheric Pressure (kPa)NASA Surface meteorology and Solar Energy (SSE) Release 6.0 Data Set (Nov 2007)22-year Monthly & Annual Average (July 1983 - June 2005)Parameter: Atmospheric Pressure (kPa)Internet: http://eosweb.larc.nasa.gov/sse/Note 1: SSE Methodology & Accuracy sections onlineNote 2: Lat/Lon values indicate the lower left corner of a 1x1 degree region. Negative values are south and west; positive values are north and east. Boundaries of the -90/-180 region Source U.S. National Aeronautics and Space Administration (NASA), Surface meteorology and Solar Energy (SSE) Date Released March 31st, 2009 (5 years ago) Date Updated Unknown Keywords atmospheric pressure climate NASA SWERA UNEP Data text/csv icon Download Data (csv, 46 MiB)

5

Atmospheric-pressure plasma jet  

SciTech Connect (OSTI)

A {gamma}-mode, resonant-cavity plasma discharge that can be operated at atmospheric pressure and near room temperature using 13.56 MHz rf power is described. Unlike plasma torches, the discharge produces a gas-phase effluent no hotter than 250 C at an applied power of about 300 W, and shows distinct non-thermal characteristics. In the simplest design, two concentric cylindrical electrodes are employed to generate a plasma in the annular region there between. A jet of long-lived metastable and reactive species that are capable of rapidly cleaning or etching metals and other materials is generated which extends up to 8 in. beyond the open end of the electrodes. Films and coatings may also be removed by these species. Arcing is prevented in the apparatus by using gas mixtures containing He, which limits ionization, by using high flow velocities, and by properly shaping the rf-powered electrode. Because of the atmospheric pressure operation, no ions survive for a sufficiently long distance beyond the active plasma discharge to bombard a workpiece, unlike low-pressure plasma sources and conventional plasma processing methods.

Selwyn, G.S.

1999-10-05T23:59:59.000Z

6

Atmospheric Pressure Discharges: Traveling Wave Plasma Sources  

Science Journals Connector (OSTI)

Microwave sustained, atmospheric pressure plasmas are finding an increasing number of applications ... interest in the developing and investigating of appropriate plasma sources [1, 2].

Z. Zakrzewski; M. Moisan

1999-01-01T23:59:59.000Z

7

Intense and Highly Energetic Atmospheric Pressure Plasma Jet Arrays.  

E-Print Network [OSTI]

??This thesis documents the efforts taken to produce highly ionized and concentrated atmospheric pressure plasma using an arrayed atmospheric pressure plasma jet (APPJ) system. The… (more)

Furmanski, John

2012-01-01T23:59:59.000Z

8

Atmospheric Pressure Deposition for Electrochromic Windows  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Atmospheric Pressure Deposition Atmospheric Pressure Deposition for Electrochromic Windows TDM - Karma Sawyer Robert C. Tenent National Renewable Energy Laboratory robert.tenent@nrel.gov 303-384-6775 4/4/2013 Insulating Glass Unit (IGU) Glass Transparent Conductor (TC) Active Electrode Counter Electrode Ion Conductor 2 | Building Technologies Office eere.energy.gov Purpose and Objectives * Expense - Current market price of $50-$100/ft 2 - Projections indicate under $20/ft 2 needed - A new production paradigm is required * Aesthetics - Architects hesitant to adopt "smurf glass"

9

Atmospheric Pressure Deposition for Electrochromic Windows  

Broader source: Energy.gov (indexed) [DOE]

Atmospheric Pressure Deposition Atmospheric Pressure Deposition for Electrochromic Windows TDM - Karma Sawyer Robert C. Tenent National Renewable Energy Laboratory robert.tenent@nrel.gov 303-384-6775 4/4/2013 Insulating Glass Unit (IGU) Glass Transparent Conductor (TC) Active Electrode Counter Electrode Ion Conductor 2 | Building Technologies Office eere.energy.gov Purpose and Objectives * Expense - Current market price of $50-$100/ft 2 - Projections indicate under $20/ft 2 needed - A new production paradigm is required * Aesthetics - Architects hesitant to adopt "smurf glass"

10

Kinetics of Non-Thermal Atmospheric Pressure  

E-Print Network [OSTI]

Kinetics of Non-Thermal Atmospheric Pressure Plasmas Alexander Fridman · Microdischarge Interaction and Structuring in Dielectric Barrier Discharges · Kinetics of Blood Coagulation in Plasma · Surface Wound wire Area of DBD plasma region: ~104cm2 #12;7 Microdischarge Patterning (2D) R22 R23 R24 R26 R27 R28

Kaganovich, Igor

11

Free Floating Atmospheric Pressure Ball Plasmas  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Free-Floating Atmospheric Pressure Ball Plasmas Free-Floating Atmospheric Pressure Ball Plasmas G. A. Wurden, Z. Wang, C. Ticos Los Alamos National Laboratory L Al NM 87545 USA Los Alamos, NM 87545 USA C. J. v. Wurden Los Alamos High School L Al NM 87544 Los Alamos, NM 87544 Presented at the PPPL Colloquium Sept. 17, 2008 U N C L A S S I F I E D Operated by the Los Alamos National Security, LLC for the DOE/NNSA LA-UR-08-06284 Outline of this talk *A discussion of ball lightning reports in nature *How can ball plasmas be made in the laboratory? *Detailed experiments on long lived free floating *Detailed experiments on long-lived free-floating atmospheric pressure ball plasmas C i f l b b ll l i h "b ll *Comparison of laboratory ball plasmas with "ball lightning" *Summary U N C L A S S I F I E D Operated by the Los Alamos National Security, LLC for the DOE/NNSA

12

Propagation of an atmospheric pressure plasma plume  

SciTech Connect (OSTI)

The ''plasma bullet'' behavior of atmospheric pressure plasma plumes has recently attracted significant interest. In this paper, a specially designed plasma jet device is used to study this phenomenon. It is found that a helium primary plasma can propagate through the wall of a dielectric tube and keep propagating inside the dielectric tube (secondary plasma). High-speed photographs show that the primary plasma disappears before the secondary plasma starts to propagate. Both plumes propagate at a hypersonic speed. Detailed studies on the dynamics of the plasma plumes show that the local electric field induced by the charges on the surface of the dielectric tube plays an important role in the ignition of the secondary plasma. This indicates that the propagation of the plasma plumes may be attributed to the local electric field induced by the charges in the bulletlike plasma volume.

Lu, X.; Xiong, Q.; Xiong, Z.; Hu, J.; Zhou, F.; Gong, W.; Xian, Y.; Zou, C.; Tang, Z.; Jiang, Z.; Pan, Y. [College of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074 (China)

2009-02-15T23:59:59.000Z

13

Novel Applications of Atmospheric Pressure Plasma on Textile Materials.  

E-Print Network [OSTI]

??Various applications of atmospheric pressure plasma are investigated in conjunction with polymeric materials including paper, polypropylene non-woven fabric, and cotton. The effect of plasma on… (more)

Cornelius, Carrie Elizabeth

2009-01-01T23:59:59.000Z

14

Dissociation of carbon dioxide in atmospheric pressure microchannel plasma devices.  

E-Print Network [OSTI]

??Plasma discharge of carbon dioxide at atmospheric pressure was successfully demonstrated in microchannel plasma devices at breakdown voltages lower than 1 kVRMS. Optical emissions of… (more)

Oh, Taegon

2013-01-01T23:59:59.000Z

15

E-Print Network 3.0 - atmospheric pressure interface Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

dynamically induced horizontal static pressure gradients at the surface-atmosphere interface (Waddington et al... role of pressure pumping due to atmospheric pressure...

16

An Introduction to Nonequilibrium Plasmas at Atmospheric Pressure  

E-Print Network [OSTI]

1 1 An Introduction to Nonequilibrium Plasmas at Atmospheric Pressure Sander Nijdam, Eddie van;2 1 An Introduction to Nonequilibrium Plasmas at Atmospheric Pressure pulsed power source for ozone Veldhuizen, Peter Bruggeman, and Ute Ebert 1.1 Introduction 1.1.1 Nonthermal Plasmas and Electron Energy

Ebert, Ute

17

Pressure &Pressure & TemperatureTemperature  

E-Print Network [OSTI]

to measure atmospheric pressure, and thermometer toprobe to measure atmospheric pressure, and thermometer toprobe to measure atmospheric pressure, and thermometer toprobe to measure atmospheric pressure, and thermometer to measure air temperature.measure air temperature.measure air temperature.measure air temperature

California at Santa Cruz, University of

18

Dental Applications of Atmospheric-Pressure Non-Thermal Plasmas  

Science Journals Connector (OSTI)

This chapter presents a summary of selected recent research efforts devoted to the use of low-temperature (or non-thermal) atmospheric-pressure plasmas in various dental applications. Areas of application ... fun...

WeiDong Zhu; Kurt Becker; Jie Pan; Jue Zhang; Jing Fang

2014-01-01T23:59:59.000Z

19

Surface modification with a remote atmospheric pressure plasma  

Science Journals Connector (OSTI)

A remote atmospheric pressure DC glow discharge is used for the treatment of polymer foils. The envisaged plasma effect is an increase in the surface ... the distribution of the current density in the plasma. The...

E. Temmerman; C. Leys

2004-03-01T23:59:59.000Z

20

Surface Modification by Atmospheric Pressure Plasma for Improved Bonding.  

E-Print Network [OSTI]

??An atmospheric pressure plasma source operating at temperatures below 150°C and fed with 1.0-3.0 volume% oxygen in helium was used to activate the surfaces of… (more)

Williams, Thomas Scott

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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

Ultraprecision Finishing of Photomask Substrate by Utilizing Atmospheric Pressure Plasma  

Science Journals Connector (OSTI)

In the case of the atmospheric pressure plasma, localized high density plasma is generated around the electrode. Therefore, ... new ultra precision machining method which is named plasma chemical vaporization mac...

Kazuya Yamamura; Akihiro Fujiwara; Koji Ueno…

2007-01-01T23:59:59.000Z

22

Applications of Non Thermal Atmospheric Pressure Plasma in Medicine  

Science Journals Connector (OSTI)

Non-thermal atmospheric pressure plasma is now being developed for use in ... a lot of clinical applications of non-thermal plasma have been tested and the results show promising potential for Plasma Medicine. In...

S. Kalghatgi; D. Dobrynin; G. Fridman…

2008-01-01T23:59:59.000Z

23

Atmospheric Pressure Photoionization Applied to Quantitation of Cyproterone Acetate in Human Plasma  

Science Journals Connector (OSTI)

......research-article Articles Atmospheric Pressure Photoionization...Acetate in Human Plasma Alberto S. Pereira...100 mg). Atmospheric pressure photoionization...acetate in human plasma. | Cyproterone...acetate in human plasma. This 513 Abstract Atmospheric Pressure Photoionization......

Alberto S. Pereira; Gustavo D. Mendes; Lina S.O.B. Oliveira; Hugo F. Valle; Gilberto De Nucci

24

E-Print Network 3.0 - atmospheric pressure helium-oxygen Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Copyright permission to reproduce figures andor text from this article 12;Remote Atmospheric-Pressure... ) were treated with an atmospheric-pressure oxygen and...

25

Photons and particles emitted from cold atmospheric-pressure plasma inactivate bacteria and biomolecules independently and synergistically  

Science Journals Connector (OSTI)

...particles emitted from cold atmospheric-pressure plasma inactivate bacteria and...Bochum, Germany Cold atmospheric-pressure plasmas are currently in use...bactericidal properties of cold atmospheric-pressure plasma. plasma medicine|atmospheric-pressure...

2013-01-01T23:59:59.000Z

26

Wind noise and the spectrum of atmospheric turbulence pressure fluctuations  

Science Journals Connector (OSTI)

Previous research [S. Morgan and R. Raspet J. Acoust. Soc. Am. 92 1180–1183 (1992)] has shown that wind noise is predominantly caused by pressure fluctuations intrinsic to the turbulent atmospheric flow. Therefore it should be possible to predict wind noise from models for turbulent pressure spectra in the atmosphere. Based on simple dimensional analysis and an application of Taylor’s hypothesis the inertial?subrange power spectrum for turbulent pressure fluctuations should be proportional to f ?7/3 where f is frequency. But more recent atmospheric observations and theoretical arguments [J. D. Albertson G. G. Katul M. B. Parlange and W. E. Eichinger Phys. Fluids 10 1725–1732 (1998)] suggest that the power spectrum actually goes as f ?3/2. In this paper it is shown that the f ?3/2 dependence predicts a much slower decay in wind noise with increasing acoustic frequency than is typically observed. Possible reasons for this discrepancy are discussed.

2003-01-01T23:59:59.000Z

27

Laser-rf creation and diagnostics of seeded atmospheric pressure air and nitrogen plasmas  

E-Print Network [OSTI]

Laser-rf creation and diagnostics of seeded atmospheric pressure air and nitrogen plasmas Siqi Luo to the ambient air. The atmospheric-pressure plasma is then maintained with the 13.56 MHz rf power. Using of atmospheric-pressure air plasmas The kinetics of reactions and transitions in atmospheric- pressure air

Scharer, John E.

28

Low pressure and atmospheric pressure plasma-jet systems and their application for deposition of thin films  

E-Print Network [OSTI]

1 Low pressure and atmospheric pressure plasma-jet systems and their application for deposition atmospheric discharge plasma jet. This system works at open air without any vacuum system. This system on polymer substrates. Under certain condition in the atmospheric plasma jet, these films have crystalline

Paris-Sud XI, Université de

29

Climate: monthly and annual average atmospheric pressure GIS data at  

Open Energy Info (EERE)

atmospheric pressure GIS data at atmospheric pressure GIS data at one-degree resolution of the World from NASA/SSE Dataset Summary Description (Abstract):Atmospheric Pressure (kPa)NASA Surface meteorology and Solar Energy (SSE) Release 6.0 Data Set (Nov 2007)22-year Monthly & Annual Average (July 1983 - June 2005)Parameter: Atmospheric Pressure (kPa)Internet: http://eosweb.larc.nasa.gov/sse/Note 1: SSE Methodology & Accuracy sections onlineNote 2: Lat/Lon values indicate the lower left corner of a 1x1 degree region. Negative values are south and west; positive values are north and east. Boundaries of the -90/-180 region are -90 to -89 (south) and -180 to -179 (west). The last region, 89/180, is bounded by 89 to 90 (north) and 179 to 180 (east). The mid-point of the region is +0.5 added to the the Lat/Lon value. These data are

30

Atmospheric Pressure Plasma Jet Treatment of Polyethylene Surfaces for  

E-Print Network [OSTI]

Atmospheric Pressure Plasma Jet Treatment of Polyethylene Surfaces for Adhesion Improvement Uwe studied the activation mechanism of polyethylene (PE) for a pretreatment with a commercial APPJ system jet system from Plasmatreat GmbH (Steinhagen, Germany) was used for the Full Paper Polyethylene (PE

Greifswald, Ernst-Moritz-Arndt-Universität

31

Continuous nanoparticle generation and assembly by atmospheric pressure arc discharge  

E-Print Network [OSTI]

Continuous nanoparticle generation and assembly by atmospheric pressure arc discharge Jesse J. Cole a dc arc discharge plasma. The particles are positively charged by the arc and form a room temperature precursor materials.5,6 High temperature plasmas in the form of dc arc discharges led to the discovery

Jacobs, Heiko O.

32

Surface Nanostructuring of Polysulfone Membranes by Atmospheric Pressure Plasma-Induced Graft Polymerization (APPIGP)  

E-Print Network [OSTI]

large substrates. Various atmospheric plasma sources arePolymerization The atmospheric plasma source used in thisby Remote Atmospheric- Pressure Plasma. Ieee Transactions on

Kim, Soo Min

2013-01-01T23:59:59.000Z

33

Atmospheric pressure plasma jet: Effect of electrode configuration, discharge behavior, and its formation mechanism  

E-Print Network [OSTI]

Atmospheric pressure plasma jet: Effect of electrode configuration, discharge behavior, and its 2008; accepted 8 June 2009; published online 10 July 2009 Atmospheric pressure plasma jet APPJ can The atmospheric pressure plasma is much advantageous over low pressure plasmas in various aspects. It can be dis

Zexian, Cao

34

Tantalum etching with a nonthermal atmospheric-pressure plasma  

Science Journals Connector (OSTI)

Tantalum was etched in a downstream atmospheric-pressure plasma. In this process etching occurred without significant ion bombardment. An etching rate of 6.0±0.5 ?m/min was achieved using 14.8 Torr oxygen 22.4 Torr carbon tetrafluoride 720±5 Torr helium 685 W radio frequency power at 13.56 MHz and a film temperature of 300?°C. The etching rate increased with the applied power carbon tetrafluoride pressure oxygen pressure and residence time of the gas between the electrodes indicating that the surface reaction depends on the density of reactive fluorine species generated in the plasma.X-ray photoemission spectroscopy revealed that the etched surface was covered with tantalum fluoride and to a lesser extent tantalum oxide. Based on these observations a mechanism for tantalumetching is proposed which involves the reaction between fluorine atoms and the adsorbed tantalum fluoride.

V. J. Tu; J. Y. Jeong; A. Schütze; S. E. Babayan; G. Ding; G. S. Selwyn; R. F. Hicks

2000-01-01T23:59:59.000Z

35

Atmospheric pressure plasma processing with microstructure electrodes and microplanar reactors  

Science Journals Connector (OSTI)

Atmospheric pressure plasmas can be generated, if the distance between the plasma generating electrodes is in the range of 100 ?m, and radio-frequencies of 13.56 or 27.12 \\{MHz\\} are applied. Such small dimensioned plasmas are only of interest for industrial plasma applications if larger areas can be processed. It will be shown that both with microstructure electrodes as with microplanar-reactor, plasma processing can be carried out for typical substrate dimensions of 100 mm and more using helium or neon for plasma generation. First experiments of plasma surface treatment of polymers and of thin film deposition on silicon will be presented. With mixtures of some percentage C2H2 in atmospheric pressure helium, diamond-like carbon films with deposition rates between 1–10 ?m/min can be deposited.

H. Schlemm; D. Roth

2001-01-01T23:59:59.000Z

36

Plasma Polymerization in an Atmospheric Pressure Dielectric Barrier Discharge in a Flowing Gas  

Science Journals Connector (OSTI)

The plasma of atmospheric pressure dielectric barrier discharges (DBD) has ... ozone generation by Siemens 1857. Non-thermal atmospheric pressure discharges are of considerable interest because...1, 2.... The DBD...

Rüdiger Foest; Martin Schmidt; Jürgen F. Behnke

2004-01-01T23:59:59.000Z

37

Simulation of Atmospheric Pressure Non-Thermal Plasma Discharges for Surface Decontamination Applications  

Science Journals Connector (OSTI)

Numerical simulations are conducted to characterize atmospheric pressure plasma discharges for surface decontamination applications. A self ... dimensional hybrid model is developed to simulate the atmospheric pr...

T. Farouk; B. Farouk; A. Gutsol; A. Fridman

2008-01-01T23:59:59.000Z

38

E-Print Network 3.0 - atmospheric-pressure photoionization source...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Collection: Physics 47 Photoionization of atmospheric gases studied by time-resolved terahertz spectroscopy Summary: with the examined gas at atmospheric pressure. The THz...

39

Spectroscopy of atmospheric pressure air jet plasma in transverse arc discharge Valeriy Chernyak1  

E-Print Network [OSTI]

Spectroscopy of atmospheric pressure air jet plasma in transverse arc discharge Valeriy Chernyak1 of the atmospheric pressure air jet plasma in the transverse cw dc arc discharge of high voltage was done. Within.g. application of approximation of the optically thin plasma in conditions of high atmospheric pressure

Paris-Sud XI, Université de

40

Interplay of discharge and gas flow in atmospheric pressure plasma jets Nan Jiang,1  

E-Print Network [OSTI]

Interplay of discharge and gas flow in atmospheric pressure plasma jets Nan Jiang,1 JingLong Yang,2 2011) Interplay of discharge and gas flow in the atmospheric pressure plasma jets generated with three:10.1063/1.3581067] I. INTRODUCTION The atmospheric pressure plasma jet (APPJ) that is nor- mally

Zexian, Cao

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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

Atmospheric pressure plasma jets beyond ground electrode as charge overflow in a dielectric barrier discharge setup  

E-Print Network [OSTI]

Atmospheric pressure plasma jets beyond ground electrode as charge overflow in a dielectric barrier voltage and the width of ground electrode, atmospheric pressure plasma jets extending beyond the ground American Institute of Physics. doi:10.1063/1.3466993 I. INTRODUCTION The cold atmospheric pressure plasma

Zexian, Cao

42

Experimental Investigation Of Atmospheric Pressure Surface Wave Discharges  

SciTech Connect (OSTI)

Microwave atmospheric pressure discharge in neon sustained by surface waves in a dielectric tube is considered. The plasma column length was measured versus absorbed microwave power for different discharge conditions. This gives a view on the wave propagation characteristics. The predicted dependence of discharge length on the total flux of wave power based on the modified model of non-equilibrium plasma is compared with experimental values. Moreover, we present results of spectroscopic investigations of the electron density. The electron density was determined using the method based on the Stark broadening of H{beta} spectral line. The spectroscopic results we shall use developing of a model of propagation of surface wave.

Czylkowski, D.; Jasinski, M.; Nowakowska, H.; Zakrzewski, Z. [The Szewalski Institute of Fluid-Flow Machinery, Polish Academy of Sciences, Fiszera 14, 80-231 Gdansk (Poland)

2006-01-15T23:59:59.000Z

43

Plasma sterilization using glow discharge at atmospheric pressure  

Science Journals Connector (OSTI)

Recent development of atmospheric pressure glow discharge was compared with the performance of an apparatus used in the first APG experiment, in terms of sterilization of newly classified biological indicator: Bacillus atrophaeus, former Bacillus subtilis var. niger and Geobacillus stearothermophilus. Stabilization was attained by controlling the experimental conditions, at low frequency: 100 kHz and Radio Frequency: 13.56 MHz, water vapor/He dilution. Large volume of meta-stable atomic helium is responsible for the result that aids generation of hydroxyl radicals.

Tetsuya Akitsu; Hiroshi Ohkawa; Masao Tsuji; Hideo Kimura; Masuhiro Kogoma

2005-01-01T23:59:59.000Z

44

Study of a dual frequency atmospheric pressure corona plasma  

SciTech Connect (OSTI)

Radio frequency mixing of 2 and 13.56 MHz was investigated by performing experimental measurements on the atmospheric pressure corona plasma. As a result of the dual frequency, length, current density, and electron excitation temperature of the plasma were increased, while the gas temperature was maintained at roughly the same level when compared to the respective single frequency plasmas. Moreover, observation of time-resolved images revealed that the dual frequency plasma has a discharge mode of 2 MHz positive streamer, 2 MHz negative glow, and 13.56 MHz continuous glow.

Kim, Dan Bee; Moon, S. Y.; Jung, H.; Gweon, B.; Choe, Wonho [Department of Physics, Korea Advanced Institute of Science and Technology, 335 Gwahangno, Yuseong-gu, Daejeon 305-701 (Korea, Republic of)

2010-05-15T23:59:59.000Z

45

Atmospheric-pressure gas breakdown from 2 to 100 MHz  

SciTech Connect (OSTI)

We report a detailed study of breakdown voltage of atmospheric-pressure helium gas between two parallel-plate electrodes from 2 to 100 MHz. Experimental data show that the breakdown voltage reduces initially with increasing frequency due to a diminishing contribution of drift-dominated electron wall loss and then begins to increase with increasing frequency. The latter is contrary to the current understanding that relies largely on the electron wall loss mechanism. Particle-in-cell simulation suggests that rapid oscillation of the applied voltage prevents electrons from reaching their maximum achievable kinetic energy, thus compromising the ionization efficiency and increasing the breakdown voltage.

Walsh, J. L.; Zhang, Y. T.; Iza, F.; Kong, M. G. [Department of Electronic and Electrical Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU (United Kingdom)

2008-12-01T23:59:59.000Z

46

The viscosity of liquids (a) Normal octanol at atmospheric pressure (b) An equipment for high pressures.  

E-Print Network [OSTI]

??Theories of Liquid Viscosity lead to equations giving the variation of the viscosity with temperature and pressure, but give poor agreement with experimental values, particularly… (more)

De Verteuil, Georges Francois

2012-01-01T23:59:59.000Z

47

Etching polyimide with a nonequilibrium atmospheric-pressure plasma jet  

Science Journals Connector (OSTI)

An atmospheric-pressure plasma jet has been used to etch polyimide films at 1.0–8.0±0.2?? m/min at 760 Torr and between 50 and 250?°C. The plasma was produced by flowing helium and oxygen between two concentric electrodes with the inner one coupled to 13.56 MHz rf power and the outer one grounded. The etch rate increased with the O 2 partial pressure the rf power and the substrate temperature. The apparent activation energy for etching was 0.16 eV. Langmuir-probe measurements revealed that the ion densities were between 1×10 10 and 1×10 11 ? cm ?3 5 mm from the end of the powered electrode. Biasing the substrate had no effect on the rate. Ozone singlet sigma metastable oxygen (b? 1 ? g + ) and singlet delta metastable oxygen (a? 1 ? g ) were detected in the plasma by emission spectroscopy. More ozone was produced in the effluent through the recombination of O atoms with O 2 . Based on the production rate of O 3 the concentration of O atoms 6 mm from the powered electrode was estimated to be ?7×10 14 ? cm ?3 at 6.6 Torr O 2 and 200 W power. It is proposed that O atoms are the principal reactive species involved in etching polyimide.

J. Y. Jeong; S. E. Babayan; A. Schütze; V. J. Tu; J. Park; I. Henins; G. S. Selwyn; R. F. Hicks

1999-01-01T23:59:59.000Z

48

A uniform glow discharge plasma source at atmospheric pressure  

Science Journals Connector (OSTI)

An atmospheric-pressure uniform continuous glowplasma was produced in ambient air assisted by argon feeding gas using a 13.56 MHz rf source. Based on the measured current–voltage curve and optical emission spectrum intensity the plasma showed typical glow discharge characteristics free from streamers and arc. The measured rotational and vibrational temperatures were in the range of 490 to 630 K and 2000 to 3300 K respectively within the operation range of argon flow rate and rf power. From the spatial measurement of total optical emission intensity and rotational and vibrational temperatures the plasma shows very high uniformity (over 93%) in the lengthwise direction. The plasma size for this study was 200 mm×50 mm×5 mm although a plasma was produced in the scaled-up version of 600 mm in length aiming for large-area plasma applications.

Se Youn Moon; W. Choe; B. K. Kang

2004-01-01T23:59:59.000Z

49

Development of a trielectrode plasma curtain at atmospheric pressure  

SciTech Connect (OSTI)

The development of a nonequilibrium, low-power, trielectrode plasma curtain at atmospheric pressure is presented. The discharge is based on the combination of an ac dielectric barrier discharge with a dc corona discharge in a three electrode system, and can be sustained for large time periods and over interelectrode air gaps up to 20 mm and with an electrode length of {approx}10 cm in the transversal direction. The discharge is composed of a train of streamers, with a repetition frequency in the range 50-200 kHz, and carrying an average current in the range 0.1-0.4 mA. The geometry of the discharge makes it appropriate for gas decontamination.

Zastawny, H.; Artana, G. [Laboratorio de Fluidodinamica, Universidad de Buenos Aires, Av. Paseo Colon 850, 1063 Buenos Aires (Argentina); Sosa, R. [Laboratorio de Fluidodinamica, Universidad de Buenos Aires, Av. Paseo Colon 850, 1063 Buenos Aires (Argentina); Instituto de Fisica del Plasma, CONICET-Dto. de Fisica, FCEN, Universidad de Buenos Aires, Ciudad. Universitaria, Pab. I, 1428 Buenos Aires (Argentina); Grondona, D.; Marquez, A.; Kelly, H. [Instituto de Fisica del Plasma, CONICET-Dto. de Fisica, FCEN, Universidad de Buenos Aires, Ciudad. Universitaria, Pab. I, 1428 Buenos Aires (Argentina)

2008-07-21T23:59:59.000Z

50

Atmospheric-Pressure Plasma Cleaning of Contaminated Surfaces  

SciTech Connect (OSTI)

Project was to develop a low-cost, environmentally benign technology for the decontamination and decommissioning of transuranic waste. With the invention of the atmospheric-pressure plasma jet the goal was achieved. This device selectively etches heavy metals from surfaces, rendering objects radiation free and suitable for decommissioning. The volatile reaction products are captured on filters, which yields a tremendous reduction in the volume of the waste. Studies on tantalum, a surrogate material for plutonium, have shown that etch rate of 6.0 microns per minute can be achieved under mild conditions. Over the past three years, we have made numerous improvements in the design of the plasma jet. It may now be operated for hundreds of hours and not undergo any degradation in performance. Furthermore, small compact units have been developed, which are easily deployed in the field.

Robert F. Hicks; Gary S. Selwyn

2001-01-09T23:59:59.000Z

51

The effects of atmospheric pressure plasma on the synthesis of carbon nanotubes  

Science Journals Connector (OSTI)

In this study, we investigated the effects of atmospheric plasma on the synthesis of carbon nanotubes (CNTs) forests. Tall and high CNTs forests have been successfully grown on a large scale using a newly developed system called atmospheric pressure ... Keywords: Atmospheric pressure, Carbon nanotubes, Mass production, Plasma effects, Plasma enhanced chemical vapor deposition

Seok Seung Shin; Bum Ho Choi; Young Mi Kim; Jong Ho Lee; Dong Chan Shin

2009-04-01T23:59:59.000Z

52

Microstreamer dynamics during plasma remediation of NO using atmospheric pressure dielectric barrier discharges  

E-Print Network [OSTI]

Microstreamer dynamics during plasma remediation of NO using atmospheric pressure dielectric- ate toxins from atmospheric pressure gas streams. Plasma remediation is one technique which has been methods for the removal of oxides of nitrogen NxOy from atmospheric gas streams and among those techniques

Kushner, Mark

53

Laser ablation electrospray ionization (LAESI) for atmospheric pressure, In vivo, and imaging mass spectrometry  

DOE Patents [OSTI]

The field of the invention is atmospheric pressure mass spectrometry (MS), and more specifically a process and apparatus which combine infrared laser ablation (LA) with electrospray ionization (ESI).

Vertes, Akos (Reston, VA); Nemes, Peter (Silver Spring, MD)

2011-11-29T23:59:59.000Z

54

Laser ablation electrospray ionization (LAESI) for atmospheric pressure, in vivo, and imaging mass spectrometry  

DOE Patents [OSTI]

The field of the invention is atmospheric pressure mass spectrometry (MS), and more specifically a process and apparatus which combine infrared laser ablation with electrospray ionization (ESI).

Vertes, Akos; Nemes, Peter

2014-08-19T23:59:59.000Z

55

Laser ablation electrospray ionization (LAESI) for atmospheric pressure, in vivo, and imaging mass spectrometry  

DOE Patents [OSTI]

The field of the invention is atmospheric pressure mass spectrometry (MS), and more specifically a process and apparatus which combine infrared laser ablation with electrospray ionization (ESI).

Vertes, Akos; Nemes, Peter

2013-07-16T23:59:59.000Z

56

Cell treatment and surface functionalization using the atmospheric pressure glow discharge plasma torch (APGD-t).  

E-Print Network [OSTI]

??The atmospheric pressure glow discharge plasma torch (APGD-t ) was used to treat cell cultures to investigate potential reactions with biological tissue. The plasma jet… (more)

Yonson, Sara.

2006-01-01T23:59:59.000Z

57

On plasma parameters of a self-organized plasma jet at atmospheric pressure  

Science Journals Connector (OSTI)

...Electron temperature and electron concentration in the active zone of a miniaturized radio frequency (RF) non-thermal atmospheric pressure plasma jet in argon have been determined using... ...

J. Schäfer; F. Sigeneger; R. Foest; D. Loffhagen…

2010-12-01T23:59:59.000Z

58

Atmospheric-pressure dielectric barrier discharge (DBD) in air : plasma characterisation for skin therapy.  

E-Print Network [OSTI]

??A pulsed atmospheric-pressure dielectric barrier discharge (DBD) device operating in air is investigated for medical applications such as for skin disinfection and promotion of wound… (more)

Rajasekaran, Priyadarshini

2011-01-01T23:59:59.000Z

59

Atmospheric-Pressure Helium Inductively Coupled Plasmas for Elemental Mass Spectrometry  

Science Journals Connector (OSTI)

Analytical and fundamental characteristics of helium inductively coupled plasma mass spectrometry (He ICPMS) were explored for atmospheric-pressure plasmas generated in a 13-mm He...

Zhang, Hao; Nam, Sang-Ho; Cai, Mingxiang; Montaser, Akbar

1996-01-01T23:59:59.000Z

60

Atmospheric pressure plasma chemical deposition by using dielectric barrier discharge system.  

E-Print Network [OSTI]

??During the last decade atmospheric pressure plasma sources have been very successful in various practical applications such as surface cleaning, modification and sterilization. Lately thin… (more)

Hong, Jungmi

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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

Atmospheric Pressure Weakly Ionized Plasma Reactor Based on the Corona Discharge .  

E-Print Network [OSTI]

??Atmospheric pressure weakly ionized plasma (APWIP) is being used to treat or process goods and materials because it only activates the surface without modification of… (more)

[No author

2012-01-01T23:59:59.000Z

62

Radio-frequency induction plasmas at atmospheric pressure: Mixtures of hydrogen, nitrogen, and oxygen with argon  

Science Journals Connector (OSTI)

Numerical calculations are reported which simulate atmospheric-pressure radiofrequency induction plasmas consisting of either pure argon or mixtures of argon with hydrogen, nitrogen, or oxygen. These calculati...

S. L. Girshick; W. Yu

1990-12-01T23:59:59.000Z

63

Soft Plasma Polymerization of Gas State Precursors from an Atmospheric Pressure Corona Plasma Discharge  

Science Journals Connector (OSTI)

Soft Plasma Polymerization of Gas State Precursors from an Atmospheric Pressure Corona Plasma Discharge ... Application of nonequilibrium plasmas in organic chemistry ...

P. Anthony F. Herbert; Liam O’Neill; Justyna Jaroszy?ska-Woli?ska

2009-09-11T23:59:59.000Z

64

E-Print Network 3.0 - atmospheric pressure measurements Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

- School of Engineering Science, Simon Fraser University Collection: Engineering ; Energy Storage, Conversion and Utilization 8 CHAPTER 2. ATMOSPHERIC PRESSURE 2.1 MEASURING...

65

Ultrahigh?Frequency Discharge in Atmospheric?Pressure Gas  

Science Journals Connector (OSTI)

A 2469 MHz discharge was generated at an open end of a coaxial waveguide through which atmospheric?pressure gas flowed. Argon served as a plasma?forming gas hydrogen and calcium as probe elements for the measurement of electron density and gas temperature respectively and sodium as a seed for increasing electron density. The density of excited hydrogen atoms the excitation temperature the electron density the ionizationtemperature and the gas temperature were measured at operating powers of 50 200 and 400 W. The plasma in the close vicinity of the electrode (0 to 0.5 mm from the terminus of the inner conductor) was not in the local thermal equilibrium at any power level investigated independently of the sodium seeding. At a distance between 1 and 3 mm from the electrode on the contrary the nonseeded plasma approached the local thermal equilibrium when the power was increased while the seeded plasma exhibited a deviation from the local thermal equilibrium. The deviation from the local thermal equilibrium in the nonseeded plasma can be interpreted to be due to inhomogeneity of the plasma. In the outer zone of the seeded plasma the excitation temperature was equal to the gas temperature but not to the ionizationtemperature. A separation of plasma components occurred which was depressed by the sodium seeding.

Seiichi Murayama

1968-01-01T23:59:59.000Z

66

Experimental evidence of chaotic behavior in atmospheric pressure arc discharge  

SciTech Connect (OSTI)

Thermal plasma technology is already playing an important role in the production of new materials, in the destruction of toxic wastes, and in the development of safer and more efficient manufacturing and material processing applications. In free burning as well as in stabilized arc columns, the inherent movement of arc root results in fluctuation in arc voltage. A full knowledge and control over the arc root dynamics can effectively lengthen the life time, drastically improve performance and reliability in arc plasma devices. In this paper, the authors experimentally investigate the fluctuating voltage signals generated from an atmospheric pressure arc discharge produced in a hollow electrode plasma torch. For the first time, analysis of these signals reveal them to exhibit chaotic behavior. The present analysis is supported with real time behavior, phase portraits, power spectra and Lyapunov exponents. Dependence of system behavior on various control parameters is also investigated. This approach is interesting in the sense that it can lead to better understanding of physics for future researches on arc plasma jets and related devices.

Ghorui, S.; Sahasrabudhe, S.N.; Murthy, P.S.S.; Das, A.K.; Venkatramani, N.

2000-02-01T23:59:59.000Z

67

Inorganic Surface Nanostructuring by Atmospheric Pressure Plasma-Induced Graft Polymerization  

E-Print Network [OSTI]

Inorganic Surface Nanostructuring by Atmospheric Pressure Plasma-Induced Graft Polymerization a silicon surface was accomplished by atmospheric pressure (AP) hydrogen plasma surface activation followed. The formation of initiation sites was controlled by the plasma exposure period, radio frequency (rf) power

Hicks, Robert F.

68

PPPL-3281, Preprint: January 1998, UC-426 Synthesis of Ozone at Atmospheric Pressure  

E-Print Network [OSTI]

-coupled plasma (ICP) torch to synthesize ozone at atmospheric pressure is explored. Ozone concentrations up1 PPPL-3281, Preprint: January 1998, UC-426 Synthesis of Ozone at Atmospheric Pressure by a Quenched Induction-Coupled Plasma Torch B.C. Stratton1, R. Knight2, and D.R. Mikkelsen1, A. Blutke3, and J

69

Influence of dissociative recombination on the LTE of argon high-frequency plasmas at atmospheric pressure  

E-Print Network [OSTI]

) model that we developed for an argon microwave (2.45 GHz) plasma at atmospheric pressure. This model-1- Influence of dissociative recombination on the LTE of argon high-frequency plasmas at atmospheric pressure A. Sáinz1 , J. Margot2 , M. C. García1 , M. D. Calzada1 1 Grupo de Espectroscopía de

Boyer, Edmond

70

Inactivation of Salmonella Enteritidis PT 30 on Almonds with a Fluidized Bed Atmospheric Pressure Plasma  

E-Print Network [OSTI]

investigated the use of a fluidized bed atmospheric pressure plasma (APP) as a possible pasteurization methodInactivation of Salmonella Enteritidis PT 30 on Almonds with a Fluidized Bed Atmospheric Pressure Plasma Kalyani Narayanan1, Nathan M. Anderson2, Gregory J. Fleischman2 and Susanne Keller2 1Institute

Heller, Barbara

71

Electrochemical migration of Ag nanoink patterns controlled by atmospheric-pressure plasma  

Science Journals Connector (OSTI)

Highly contrasting surface energies were induced on polyimide (PI) substrates using atmospheric-pressure plasma (APP) to allow precise printing of Ag electrodes that showed mitigated electrochemical migration (ECM). The substrate surface was made uniformly ... Keywords: Atmospheric-pressure plasma, Dendritic growth, Electrochemical migration (ECM), Inkjet printing, Silver nanoink

Kwang-Seok Kim; Young-Tae Kwon; Yong-Ho Choa; Seung-Boo Jung

2013-06-01T23:59:59.000Z

72

Atmospheric Pressure Humid Argon DBD Plasma for the Application of Sterilization -Measurement and Simulation of Hydrogen, Oxygen, and Hydrogen  

E-Print Network [OSTI]

Atmospheric Pressure Humid Argon DBD Plasma for the Application of Sterilization - Measurement, sterilization I. INTRODUCTION Non-thermal plasma technology at atmospheric pressure using oxygen of atmospheric pressure non-thermal argon plasma produced by a variety of techniques has recently begun

Paris-Sud XI, Université de

73

Diamond and Related Materials, 2 (1993) 661 666 661 Degenerate four-wave mixing diagnostics of atmospheric pressure  

E-Print Network [OSTI]

application of this new spectroscopic technique to an atmospheric pressure plasma synthesis reactor. DFWM synthesis at atmospheric pressure have been performed using an r.f. inductively coupled plasma torch [1 of atmospheric pressure diamond deposition T. G. Owano and C. H. Kruger Iti~'4h7~,mperatureGasdynamies Laboratory

Zare, Richard N.

74

On-line SiOx coating of extruded polystyrene sheets utilizing atmospheric pressure plasma treatment  

Science Journals Connector (OSTI)

Coating of polystyrene sheets with SiOx layer was performed by employing an atmospheric pressure plasma device. Mixtures of hexamethyldisiloxane with different compositions of carrier gas based on synthetic air, oxygen, and/or nitrogen were ... Keywords: atmoshperic pressure plasma, coating deposition, hexamethyldisiloxane, polystyrene, sheet extrusion, surface treatment

O. Hudecek; T. Sedlacek; A. Minarik; P. Saha

2011-07-01T23:59:59.000Z

75

Abstract The present study uses increased atmospheric pressure as an ethanol antagonist to test the hypothesis  

E-Print Network [OSTI]

Abstract The present study uses increased atmospheric pressure as an ethanol antagonist to test for ethanol. This was accomplished using behavioral and in vitro mea- sures to determine the effects of pressure on ethanol and other GABAergic drugs in C57BL/6 and LS mice. Be- haviorally, exposure to 12 times

Brinton, Roberta Diaz

76

Augmented survival of Neisseria gonorrhoeae within biofilms: exposure to atmospheric pressure non-thermal plasmas  

Science Journals Connector (OSTI)

Bacteria embedded within biofilms present a challenge to surface decontamination by conventional means. Atmospheric pressure non-thermal plasma processes have emerged as a promising approach to overcoming this pr...

L. Xu; Y. Tu; Y. Yu; M. Tan; J. Li; H. Chen

2011-01-01T23:59:59.000Z

77

Effects of atmospheric-pressure non-thermal plasma jets on enzyme solutions  

Science Journals Connector (OSTI)

In order to study the wide scope of structural information of biomolecules in the presence of biocompatible cold atmospheric pressure plasma jets (CAPJ), we used circular dichroism (CD) and fluorescence experi...

Pankaj Attri; Pannuru Venkatesu; Nagendra Kaushik…

2012-03-01T23:59:59.000Z

78

Non-thermal atmospheric pressure plasmas as a novel candidate for preventive therapy of melanoma  

Science Journals Connector (OSTI)

Due to the increased ultraviolet radiation, the incidence of melanoma is increasing worldwide more than that of any other cancer. In this study, the effects of irradiation of non-thermal atmospheric pressure plasmas

Yasuhiro Omata; Machiko Iida; Ichiro Yajima…

2014-09-01T23:59:59.000Z

79

Inactivation of Microorganisms in Model Biofilms by an Atmospheric Pressure Pulsed Non-thermal Plasma  

Science Journals Connector (OSTI)

Non-thermal plasma jet formed by self-running pulsed-periodical ... current spark generator (PPSG) was used for atmospheric pressure inactivation of microorganisms including biofilms. A ... the PPSG is a formatio...

Yuri Akishev; N. Trushkin; M. Grushin…

2012-01-01T23:59:59.000Z

80

Atmospheric Pressure Plasma Treatment of Fused Silica, Related Surface and Near-Surface Effects and Applications  

Science Journals Connector (OSTI)

We report on an atmospheric pressure plasma (APP) treatment of fused silica and its related surface and near-surface effects. Such treatment was performed in order to improve laser ... process gas was used. By th...

Christoph Gerhard; Tobias Weihs; Daniel Tasche…

2013-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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

Modeling Studies of Atmospheric Pressure Microplasmas: Plasma Dynamics, Surface Interaction and Applications.  

E-Print Network [OSTI]

??Technologies based on atmospheric-pressure microplasmas (APMs) have been widely developed due to the unique nature microplasmas being non-equilibrium and its ability to operate stably at… (more)

Wang, Jun-Chieh

2014-01-01T23:59:59.000Z

82

Surface modification and aging effect of polysulfonamide yarns treated by atmospheric pressure plasma  

Science Journals Connector (OSTI)

The effect of atmospheric pressure plasma treatment on wettability and dyeability of polysulfonamide ... were investigated. The helium and helium/oxygen plasma-treated PSA yarns were stored for different...K/S......

C. X. Wang; J. C. Lv; D. W. Gao; G. L. Liu; L. M. Jin; J. H. Liu

2013-09-01T23:59:59.000Z

83

The Chemistry of Methane Remediation by a Non?thermal Atmospheric Pressure Plasma  

Science Journals Connector (OSTI)

The destruction of methane by a non?thermal plasma in atmospheric pressure gas streams of nitrogen with variable ... determined by on?line FTIR spectroscopy and the plasma chemistry is interpreted using kinetic m...

Kirsty J. Pringle; J. Christopher Whitehead…

2004-09-01T23:59:59.000Z

84

Surface Nanostructuring of Polysulfone Membranes by Atmospheric Pressure Plasma-Induced Graft Polymerization (APPIGP).  

E-Print Network [OSTI]

??Surface nano-structuring of polysulfone (PSf) membrane surrogate surfaces was accomplished by grafting hydrophilic polymers, poly(methacrylic acid) (PMAA) and poly(acrylic acid) (PAA), using the atmospheric pressure… (more)

Kim, Soo Min

2013-01-01T23:59:59.000Z

85

Spatial Characterization of the Atmospheric-Pressure Moderate-Power He Microwave-Induced Plasma  

Science Journals Connector (OSTI)

Three-dimensional emission profiles of several metallic and nonmetallic elements from a moderate-power (450 W) atmospheric-pressure helium microwave-induced plasma (He MIP) are...

Pak, Yong-Nam; Koirtyohann, S R

1991-01-01T23:59:59.000Z

86

Atmospheric-pressure plasma treatment of ultra-high-molecular-weight polypropylene fabric  

Science Journals Connector (OSTI)

Effects of an atmospheric pressure surface discharge on a woven ultrahigh molecular weight polyethylene fabric were studied. Our results show that the surface discharge can be used to achieve a higher long-ter...

J. Ráhel’; M. ?ernák; I. Hudec; A. Brablec; D. Trunec…

2000-03-01T23:59:59.000Z

87

Differential laser absorption spectroscopy of uranium in an atmospheric pressure laser-induced plasma  

Science Journals Connector (OSTI)

A two-beam differential laser absorption technique is used to measure U238 absorption spectra with high signal-to-noise ratios in an atmospheric pressure laser-induced plasma....

Taylor, N R; Phillips, M C

2014-01-01T23:59:59.000Z

88

Electrical Features of Radio-frequency, Atmospheric-pressure, Bare-metallic-electrode Glow Discharges  

Science Journals Connector (OSTI)

Radio-frequency (RF), atmospheric-pressure glow discharge (APGD) plasmas with bare metallic electrodes have promising prospects in the fields of plasma-aided etching, deposition, disinfection and sterilization, ....

He-Ping Li; Wen-Ting Sun; Hua-Bo Wang; Guo Li…

2007-10-01T23:59:59.000Z

89

Decontamination of VX Surrogate Malathion by Atmospheric Pressure Radio-frequency Plasma Jet  

Science Journals Connector (OSTI)

Decontamination of the VX surrogate (malathion) by the atmospheric pressure radio-frequency plasma jet (APPJ) was investigated. Optical emission ... the neutral gas temperature. The effects of RF input power and ...

Wen-Chao Zhu; Bai-Rong Wang; Hai-Ling Xi…

2010-06-01T23:59:59.000Z

90

Inactivation of microbes and macromolecules by atmospheric-pressure plasma jets  

Science Journals Connector (OSTI)

Plasma is ionized gas, which is found in ... be generated artificially. A variety of cold atmospheric-pressure plasmas are currently being investigated for their clinical ... reporting on the treatment of patient...

Jan-Wilm Lackmann; Julia Elisabeth Bandow

2014-07-01T23:59:59.000Z

91

Study of the specific features of pulsed-plasma generation in air at atmospheric pressure  

Science Journals Connector (OSTI)

The structural scheme and operational characteristics of a pulse-plasma device generating a pulsed plasma in air at atmospheric pressure are presented. The functional scheme and ... given. It is shown that the pu...

Ya. A. Chivel’; O. O. Kuznechik…

2011-09-01T23:59:59.000Z

92

Antistatic effect of atmospheric pressure glow discharge cold plasma treatment on textile substrates  

Science Journals Connector (OSTI)

Hydrophobic synthetic textile substrates, nylon and polyester fabrics, were continuously treated in an atmospheric-pressure-glow-discharge-cold-plasma reactor using He and air. The samples ... charge decay time. ...

Kartick Kumar Samanta; Manjeet Jassal; Ashwini K. Agrawal

2010-06-01T23:59:59.000Z

93

Carbon nanostructures production by AC arc discharge plasma process at atmospheric pressure  

Science Journals Connector (OSTI)

Carbon nanostructures have received much attention for a wide range of applications. In this paper, we produced carbon nanostructures by decomposition of benzene using AC arc discharge plasma process at atmospheric pressure. Discharge was carried out ...

Shenqiang Zhao; Ruoyu Hong; Zhi Luo; Haifeng Lu; Biao Yan

2011-01-01T23:59:59.000Z

94

Functionalization of Cotton by In-Situ Reaction of Styrene in Atmospheric Pressure Plasma Zone  

Science Journals Connector (OSTI)

Cotton fabric was treated using styrene/helium glow plasma at the atmospheric pressure. After the treatment, the substrate ... and frequency, on fragmentation of styrene inside plasma zone was investigated using ...

Dambarudhar Parida; Manjeet Jassal…

2012-12-01T23:59:59.000Z

95

Radial characterisation of the helium plasma produced by the axial injection torch (TIA) at atmospheric pressure  

Science Journals Connector (OSTI)

This work presents the radial characterisation of a helium plasma produced by the “Torch à Injection Axiale ... using a collisional-radiative model for helium at atmospheric pressure, the electronic density and e...

R. Álvarez; A. Rodero; M. C. Quintero

2000-03-01T23:59:59.000Z

96

Water permeability of quarry stone superficially modified by plasma polymerization of hexamethyldisiloxane at atmospheric pressure  

Science Journals Connector (OSTI)

The surface of quarry stone was modified with a thin film of plasma-polymerized hexamethyldisiloxane (PPHMDSO) deposited at atmospheric pressure. The surface of the treated stone...3 and Si-CH3 bands characterist...

J. Antonio López-Barrea…

2014-07-01T23:59:59.000Z

97

Interactions of Non-Thermal Atmospheric Pressure Plasma with Solid and Liquid Food Systems: A Review  

Science Journals Connector (OSTI)

Non-equilibrium atmospheric pressure plasma processes combine several advantages such as non- ... science and technology dealing with the application of plasma processes on solid and liquid foodstuff. Starting wi...

Björn Surowsky; Oliver Schlüter; Dietrich Knorr

2014-07-01T23:59:59.000Z

98

Surface free energy changes of stainless steel after one atmospheric pressure plasma treatment  

Science Journals Connector (OSTI)

Stainless steel plates (AISI 304L) were treated by an atmospheric pressure plasma treatment at room temperature in order to modify the surface properties. After plasma treatment, the surface wettability and the s...

Shen Tang; Oh-June Kwon; Na Lu; Ho-Suk Choi

2004-12-01T23:59:59.000Z

99

Attenuation of Electromagnetic Waves by a Plasma Layer at Atmospheric Pressure  

Science Journals Connector (OSTI)

Plasma layers at atmospheric pressure, are good broad band absorbers of ... have to be optimized. These are the plasma number density, and the thickness of the plasma layer. It is found that in order ... an effec...

Mounir Laroussi; William T. Anderson

1998-03-01T23:59:59.000Z

100

The Plasma Flame: Development and Application of a Hybrid Plasma at Atmospheric Pressure.  

E-Print Network [OSTI]

??The focus of this work was to develop a hybrid plasma at atmospheric pressure, which we have deemed the “plasma flame†. This discharge is… (more)

King, Matthew Russell

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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

The Surface-Pressure Signature of Atmospheric Tides in Modern Climate Models  

E-Print Network [OSTI]

Although atmospheric tides driven by solar heating are readily detectable at the earth’s surface as variations in air pressure, their simulations in current coupled global climate models have not been fully examined. This ...

Covey, Curt

102

Surface Modification by Atmospheric Pressure Plasma for Improved Bonding  

E-Print Network [OSTI]

composites using atmospheric plasma treatment. J. Appl.of polymer surfaces: atmospheric plasma versus vacuum plasmaA. Morgan, The effect of atmospheric plasma treatment on the

Williams, Thomas Scott

2013-01-01T23:59:59.000Z

103

Gas breakdown in an atmospheric pressure radio-frequency capacitive plasma source  

Science Journals Connector (OSTI)

Gas breakdown is studied in an atmospheric pressure rf capacitive plasma source developed for materials applications. At a rf frequency of 13.56 MHz breakdown voltage is largely a function of the product of the pressure and the discharge gap spacing approximating the Paschen curve. However breakdown voltage varies substantially with rf frequency due to a change in the electron loss mechanism. A large increase in breakdown voltage is observed when argon oxygen or nitrogen is added to helium despite their lower ionization potential. Discussion is given for optimal breakdown conditions at atmospheric pressure.

Jaeyoung Park; I. Henins; H. W. Herrmann; G. S. Selwyn

2001-01-01T23:59:59.000Z

104

detonation pressure  

Science Journals Connector (OSTI)

detonation pressure ? Detonationsdruck m [Er ist dem Quadrat der Detonationsgeschwindigkeit und der Sprengstoffdichte proportional

2014-08-01T23:59:59.000Z

105

Surface atmospheric pressure excitation of the translational mode of the inner core  

E-Print Network [OSTI]

Using hourly atmospheric surface pressure field from ECMWF (European Centre for Medium-Range Weather Forecasts) and from NCEP (National Centers for Environmental Prediction) Climate Forecast System Reanalysis (CFSR) models, we show that atmospheric pressure fluctuations excite the translational oscillation of the inner core, the so-called Slichter mode, to the sub-nanogal level at the Earth surface. The computation is performed using a normal-mode formalism for a spherical, self-gravitating anelastic PREM-like Earth model. We determine the statistical response in the form of power spectral densities of the degree-one spherical harmonic components of the observed pressure field. Both hypotheses of inverted and non-inverted barometer for the ocean response to pressure forcing are considered. Based on previously computed noise levels, we show that the surface excitation amplitude is below the limit of detection of the superconducting gravimeters, making the Slichter mode detection a challenging instrumental task...

Rosat, Séverine; Rogister, Yves

2014-01-01T23:59:59.000Z

106

Plasma Grooving System Using Atmospheric Pressure Surface Discharge Plasma  

Science Journals Connector (OSTI)

To fabricate narrow front contact grooves on a single crystalline silicon solar cell, we carried out etching of a silicon nitride film on a silicon substrate using the surface discharge plasma operated at atmospheric

Toshiyuki Hamada; Tatsuya Sakoda; Masahisa Otsubo

2009-06-01T23:59:59.000Z

107

Influence of Penning effect on the plasma features in a non-equilibrium atmospheric pressure plasma jet  

E-Print Network [OSTI]

Influence of Penning effect on the plasma features in a non-equilibrium atmospheric pressure plasma 2014 23:18:06 #12;Influence of Penning effect on the plasma features in a non-equilibrium atmospheric March 2014) Non-equilibrium atmospheric pressure plasma jet (APPJ) is a cold plasma source that promises

Zexian, Cao

108

Atmospheric pressure plasma chemical vapor deposition system for high-rate deposition of functional materials  

Science Journals Connector (OSTI)

The atmospheric pressure plasmachemical vapor deposition(CVD) system has been developed to fabricate functional thin films at very high deposition rate. The atmospheric pressure plasma in which high-density radicals are created has been effectively used to depositthin films. Combination of the newly designed rotary electrode and the 150 MHz very high frequency power supply makes it possible not only to generate the high-density atmospheric pressure plasma but also to avoid ion bombardment against the film. By virtue of these noble characteristics of the system high quality films can be fabricated at an unprecedented high deposition rate. In order to demonstrate the effectiveness of the atmospheric pressure plasmaCVD system hydrogenated amorphous silicon (a- Si:H ) films were prepared in gas mixtures containing He H 2 and SiH 4 . The results showed that homogeneous a- Si:H films grew when substrates were heated at 200?°C. Extremely high deposition rate which was more than 100 times faster than that of the conventional low-pressure plasma CVD technique was realized.

Y. Mori; K. Yoshii; H. Kakiuchi; K. Yasutake

2000-01-01T23:59:59.000Z

109

Characteristics of radio-frequency, atmospheric-pressure glow discharges with air using bare metal electrodes  

SciTech Connect (OSTI)

In this letter, an induced gas discharge approach is proposed and described in detail for obtaining a uniform atmospheric-pressure glow discharge with air in a {gamma} mode using water-cooled, bare metal electrodes driven by radio-frequency (13.56 MHz) power supply. A preliminary study on the discharge characteristics of the air glow discharge is also presented in this study. With this induced gas discharge approach, radio-frequency, atmospheric-pressure glow discharges using bare metal electrodes with other gases which cannot be ignited directly as the plasma working gas, such as nitrogen, oxygen, etc., can also be obtained.

Wang Huabo; Sun Wenting; Li Heping; Bao Chengyu; Zhang Xiaozhang [Department of Engineering Physics, Tsinghua University, Beijing 100084 (China)

2006-10-16T23:59:59.000Z

110

Atmospheric-pressure argon/oxygen plasma-discharge source with a stepped electrode  

SciTech Connect (OSTI)

The nonequilibrium glow discharge in argon mixed with oxygen at atmospheric pressure was generated in a parallel plate reactor with a stepped electrode powered by a 13.56 MHz radio-frequency power supplier. The stepped-electrode reactor consists of a narrow and wide gap structure. A strong electric field occurred at the narrow gap region preionizes Ar/O{sub 2} gas and assists to generate a large volumetric plasma in the wide gap region. Therefore, the stepped-electrode reactor makes it easy to operate Ar/O{sub 2} glow discharge, providing a stable, uniform, and broad plasma jet at atmospheric pressure.

Lim, Jin-Pyo; Uhm, Han S.; Li Shouzhe [Department of Molecular Science and Technology, Ajou University, San 5 Wonchon-Dong, Youngtong-Gu, Suwon 443-749 (Korea, Republic of); State Key Laboratory of Materials Modification by Laser, Ion and Electron Beams and Department of Physics, Dalian University of Technology, Dalian 116024 (China)

2007-01-29T23:59:59.000Z

111

Deposition of yttria-stabilized zirconia thermal barrier coatings by laser-assisted plasma coating at atmospheric pressure.  

E-Print Network [OSTI]

??This thesis details the design and construction of a microwave generation system, and a coaxial cylindrical plasma torch, where an atmospheric-pressure plasma (APP) can be… (more)

Ouyang, Zihao

2011-01-01T23:59:59.000Z

112

Study of atmospheric pressure weakly ionized plasma as surface compatibilization technique for improved plastic composites loaded with cellulose based fillers .  

E-Print Network [OSTI]

??Atmospheric pressure plasmas have gained considerable interest from researchers recently for their unique prospective of engineering surfaces with plasma without the need of vacuum systems.… (more)

[No author

2013-01-01T23:59:59.000Z

113

Keratinocyte and Hepatocyte Growth Proliferation and Adhesion to Helium and Helium/Oxygen Atmospheric Pressure Plasma Treated Polyethylene Terephthalate.  

E-Print Network [OSTI]

??To improve the surface properties of biomaterials, the effects of changes in surface chemistry and morphology of polyethylene terephthalate (PET) films treated with atmospheric pressure… (more)

Christie, Megan Allison

2006-01-01T23:59:59.000Z

114

Modeling of atmospheric-pressure plasma columns sustained by surface waves  

Science Journals Connector (OSTI)

A self-consistent two-dimensional fluid-plasma model coupled to Maxwell’s equations is presented for argon discharges sustained at atmospheric pressure by the propagation of an electromagnetic surface wave. The numerical simulation provides the full axial and radial structure of the surface-wave plasma column and the distribution of the electromagnetic fields for given discharge operating conditions. To describe the contraction phenomenon, a characteristic feature of high-pressure discharges, we consider the kinetics of argon molecular ions in the charged-particle balance. An original feature of the model is to take into account the gas flow by solving self-consistently the mass, momentum, and energy balance equations for neutral particles. Accounting for the gas flow explains reported discrepancies between measured and calculated plasma parameters when assuming the local axial uniformity approximation. In contrast to the low-pressure case, the latter approximation is shown to be of limited validity at atmospheric pressure. The gas temperature is found to be a key parameter in modeling surface-wave discharges sustained at atmospheric pressure. It determines the radial and the axial structure of the plasma column. The calculated plasma parameters and wave propagation characteristics using the present two-dimensional fluid model are in good agreement with our set of experimental data.

Y. Kabouzi; D. B. Graves; E. Castaños-Martínez; M. Moisan

2007-01-09T23:59:59.000Z

115

Study of a dual frequency atmospheric pressure corona plasma  

Science Journals Connector (OSTI)

Radio frequency mixing of 2 and 13.56 MHz was investigated by performing experimental measurements on the atmospheric pressurecoronaplasma. As a result of the dual frequency length current density and electron excitation temperature of the plasma were increased while the gas temperature was maintained at roughly the same level when compared to the respective single frequency plasmas. Moreover observation of time-resolvedimages revealed that the dual frequency plasma has a discharge mode of 2 MHz positive streamer 2 MHz negative glow and 13.56 MHz continuous glow.

Dan Bee Kim; S. Y. Moon; H. Jung; B. Gweon; Wonho Choe

2010-01-01T23:59:59.000Z

116

Application of non-thermal atmospheric pressure ac plasmas to the carbon dioxide reforming of methane  

Science Journals Connector (OSTI)

Methane conversions of 11.9%, yields of hydrogen as high as 23.3% and energy yields of 1.0 mol H2/kWh have been achieved from CO2 reforming of CH4 in non-thermal, atmospheric pressure plasma reactors with Pt coat...

Stephanie L. Brock; Tomoko Shimojo; Steven L. Suib…

117

Modification of Glassy Carbon Surfaces by an Atmospheric Pressure Cold Plasma H. Mortensen 1  

E-Print Network [OSTI]

Modification of Glassy Carbon Surfaces by an Atmospheric Pressure Cold Plasma Torch H. Mortensen 1. Bindslev 1 1 Optics and Plasma Research Department, 2 Danish Polymer Centre, 3 Materials Research/FAX: +45-4677-4532/+45-4677-4565. E-mail: henrik.junge.mortensen@risoe.dk Plasma treatment of glassy carbon

118

Pool boiling heat transfer enhancement over cylindrical tubes with water at atmospheric pressure, Part I: Experimental results  

E-Print Network [OSTI]

Pool boiling heat transfer enhancement over cylindrical tubes with water at atmospheric pressure online 4 May 2013 Keywords: Pool boiling Heat transfer enhancement Open microchannels Cylindrical tube boiling heat transfer over enhanced cylindrical microchannel test surfaces with water at atmospheric

Kandlikar, Satish

119

Plasma-Assisted Reduction of Graphene Oxide at Low Temperature and Atmospheric Pressure for Flexible Conductor Applications  

Science Journals Connector (OSTI)

Plasma-Assisted Reduction of Graphene Oxide at Low Temperature and Atmospheric Pressure for Flexible Conductor Applications ... The method allows rapid deoxygenation of bulk graphite oxide (GO) in an atmosphere of ... ...

Seung Whan Lee; Cecilia Mattevi; Manish Chhowalla; R. Mohan Sankaran

2012-02-22T23:59:59.000Z

120

Relation between plasma plume density and gas flow velocity in atmospheric pressure plasma  

SciTech Connect (OSTI)

We have studied atmospheric pressure plasma generated using a quartz tube, helium gas, and copper foil electrode by applying RF high voltage. The atmospheric pressure plasma in the form of a bullet is released as a plume into the atmosphere. To study the properties of the plasma plume, the plasma plume current is estimated from the difference in currents on the circuit, and the drift velocity is measured using a photodetector. The relation of the plasma plume density n{sub plu}, which is estimated from the current and the drift velocity, and the gas flow velocity v{sub gas} is examined. It is found that the dependence of the density on the gas flow velocity has relations of n{sub plu} ? log(v{sub gas}). However, the plasma plume density in the laminar flow is higher than that in the turbulent flow. Consequently, in the laminar flow, the density increases with increasing the gas flow velocity.

Yambe, Kiyoyuki; Taka, Shogo; Ogura, Kazuo [Graduate School of Science and Technology, Niigata University, Niigata 950-2181 (Japan)] [Graduate School of Science and Technology, Niigata University, Niigata 950-2181 (Japan)

2014-04-15T23:59:59.000Z

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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

Dynamics of plasma expansion and shockwave formation in femtosecond laser-ablated aluminum plumes in argon gas at atmospheric pressures  

E-Print Network [OSTI]

plasma expansion into a background gas at atmospheric pressure is cru- cial for many engineeringDynamics of plasma expansion and shockwave formation in femtosecond laser-ablated aluminum plumes in argon gas at atmospheric pressures Alexander Miloshevsky, Sivanandan S. Harilal, Gennady Miloshevsky

Harilal, S. S.

122

Cold microplasma plume produced by a compact and flexible generator at atmospheric pressure  

SciTech Connect (OSTI)

In this letter, we report a cold microplasma generator at atmospheric pressure excited at 1 kHz in a pin to hole-electrode configuration by using soft materials partly. A nitrogen plasma plume with a length of more than 5 cm can be produced at low electrical power of 0.7 W without high feed gas pressure. The generator exhibits a compact structure with flexible property, which is suitable for treating thermally sensitive materials and biomedical materials, especially for delicate objects in an irregular confined space. Optical emission spectroscopy is used to spatially identify excited species in plasma plume.

Ni, T. L.; Ding, F.; Zhu, X. D.; Wen, X. H.; Zhou, H. Y. [CAS Key Laboratory of Basic Plasma Physics, Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026 (China)

2008-06-16T23:59:59.000Z

123

Sulfur capture by oil shale ashes under atmospheric and pressurized FBC conditions  

SciTech Connect (OSTI)

When oil shale contains large quantities of limestone, a significant auto-absorption of sulfur is possible under suitable conditions. The sulfur capture by oil shale ashes has been studied using a pressurized thermogravimetric apparatus. The chosen experimental conditions were typical for atmospheric and pressurized fluidized bed combustion. The Ca/S molar ratios in the two oil shales studied were 8 (Estonian) and 10 (Israeli). The samples were first burned in a gas atmosphere containing O{sub 2} and N{sub 2} (and CO{sub 2} if pressurized). After the combustion step, SO{sub 2} was added and sulfation started. The results with the oil shales were compared to those obtained with an oil shale cyclone ash from the Narva power plant in Estonia. In general, the results from the sulfur capture experiments under both atmospheric and pressurized conditions showed that the oil shale cannot only capture its own sulfur but also significant amounts of additional sulfur of another fuel if the fuels are mixed together. For example from the runs at atmospheric pressure, the conversion of CaO to CaSO{sub 4} was about 70% for Israeli oil shale and about 55% for Estonian oil shale (850 C). For the cyclone ash the corresponding conversion was about 20%. In comparison it could be mentioned that under the same conditions the conversions of natural limestones are about 30%. The reason the cyclone ash was a poor sulfur absorbent was probably due to its temperature history. In Narva the oil shale was burned at a significantly higher temperature (1,400 C) than was used in the experiments (750 C and 850 C). This caused the ash to sinter and the reactive surface area of the cyclone ash was therefore decreased.

Yrjas, K.P.; Hupa, M. [Aabo Akademi Univ., Turku (Finland). Dept. of Chemical Engineering; Kuelaots, I.; Ots, A. [Tallinn Technical Univ. (Estonia). Thermal Engineering Dept.

1995-12-31T23:59:59.000Z

124

Osmotic Pressure  

Science Journals Connector (OSTI)

... Whetham in which he attempts to consign actual experimental work on osmotic pressure to the humble rôle of showing how far the assumptions made in so-called thermodynamical proofs can be ... actual osmotic processes, and that the experimental work on osmotic pressure does not play that humble rôle to which Mr. Whetham would consign it. ...

LOUIS KAHLENBERG

1906-07-05T23:59:59.000Z

125

Micro-structured electrode arrays: atmospheric pressure plasma processes and applications  

Science Journals Connector (OSTI)

Micro-structured electrode (MSE) arrays allow to generate large-area uniform glow discharges over a wide pressure range up to atmospheric pressure. The electrode dimensions in the micro-range realized by means of modern micro-machining and galvanic techniques are small enough to generate sufficiently high electric field strengths to ignite gas discharges applying only moderate radio frequency (13.56 MHz) voltages (80–390 V in Ne, He, Ar and N2). The non-thermal plasma system is characterized by a special probe measuring the electric parameters. Possible industrial applications of the MSE arrays are plasma chemistry (e.g. waste gas decomposition) and surface modification of materials. Using an MSE based micro-reactor the abatement of the greenhouse gas CF4 was performed with decomposition rates of over 90% at a pressure of 100 mbar in He and N2. The decomposition of waste gases in the plasma was monitored online with quadrupole mass spectrometry. At atmospheric pressure in He the abatement rate of CF4 is still over 70%. Other applications realized in our lab are thin film deposition of diamond-like carbon layers and SiO2 layers on various substrates and sterilization of food packaging materials.

L. Baars-Hibbe; P. Sichler; C. Schrader; C. Geßner; K.-H. Gericke; S. Büttgenbach

2003-01-01T23:59:59.000Z

126

Atmospheric pressure spatial atomic layer deposition web coating with in situ monitoring of film thickness  

SciTech Connect (OSTI)

Spectral reflectometry was implemented as a method for in situ thickness monitoring in a spatial atomic layer deposition (ALD) system. Al{sub 2}O{sub 3} films were grown on a moving polymer web substrate at 100?°C using an atmospheric pressure ALD web coating system, with film growth of 0.11–0.13?nm/cycle. The modular coating head design and the in situ monitoring allowed for the characterization and optimization of the trimethylaluminum and water precursor exposures, purge flows, and web speed. A thickness uniformity of ±2% was achieved across the web. ALD cycle times as low as 76?ms were demonstrated with a web speed of 1?m/s and a vertical gap height of 0.5?mm. This atmospheric pressure ALD system with in situ process control demonstrates the feasibility of low-cost, high throughput roll-to-roll ALD.

Yersak, Alexander S.; Lee, Yung C. [Department of Mechanical Engineering, University of Colorado at Boulder, 1045 Regent Drive, 422 UCB, Boulder, Colorado 80309-0422 (United States); Spencer, Joseph A.; Groner, Markus D., E-mail: mgroner@aldnanosolutions.com [ALD NanoSolutions, Inc., 580 Burbank Street, Unit 100, Broomfield, Colorado 80020 (United States)

2014-01-15T23:59:59.000Z

127

Discharge characteristics of atmospheric-pressure radio-frequency glow discharges with argon/nitrogen  

SciTech Connect (OSTI)

In this letter, atmospheric-pressure glow discharges in {gamma} mode with argon/nitrogen as the plasma-forming gas using water-cooled, bare copper electrodes driven by radio-frequency power supply at 13.56 MHz are achieved. The preliminary studies on the discharge characteristics show that, induced by the {alpha}-{gamma} coexisting mode or {gamma} mode discharge of argon, argon-nitrogen mixture with any mixing ratios, even pure nitrogen, can be employed to generate the stable {gamma} mode radio-frequency, atmospheric-pressure glow discharges and the discharge voltage rises with increasing the fraction of nitrogen in the argon-nitrogen mixture for a constant total gas flow rate.

Wang Huabo; Sun Wenting; Li Heping; Bao Chengyu; Gao Xing; Luo Huiying [Department of Engineering Physics, Tsinghua University, Beijing 100084 (China); School of Public Health and Family Medicine, Capital University of Medical Sciences, Beijing 100069 (China); Beijing Center for Diseases Control and Prevention, Beijing 100013 (China)

2006-10-16T23:59:59.000Z

128

Ozone production by nanoporous dielectric barrier glow discharge in atmospheric pressure air  

SciTech Connect (OSTI)

This study is aimed at demonstrating plasma-chemical ozone production based on low temperature atmospheric pressure glow discharge through nanoporous dielectric barriers. The 20 kHz ac driven discharge is formed in air or oxygen gas flowing in the axial direction of the cylindrical plasma reactor containing four parallel aluminum rods covered with nanoporous alumina films. The discharge utilizing nanoporous dielectric barrier is more uniform and more energy efficient in ozone generation than the discharge through smooth-surface dielectric barriers.

Cho, J. H.; Koo, I. G.; Choi, M. Y.; Lee, W. M. [Department of Chemistry and Division of Energy Systems Research, Ajou University, Suwon 443-749 (Korea, Republic of)

2008-03-10T23:59:59.000Z

129

Polygeneration of Liquid Fuels and Electricity by the Atmospheric Pressure Hybrid Solar Gasification of Coal  

Science Journals Connector (OSTI)

(16, 17, 29, 30) The technical viability of the atmospheric pressure, windowed solar vortex reactor to gasify petroleum coke (petcoke) has been demonstrated on a small scale,(16, 29, 31) and a 300 kW pilot scale reactor has also been tested successfully. ... Inputs to the reactor were the model coal (as discussed above), nitrogen used for the carrier gas for the coal feed, steam used as a gasifying agent, and oxygen that is needed when ? gas turbine for electricity generation. ...

Ashok A. Kaniyal; Philip J. van Eyk; Graham J. Nathan; Peter J. Ashman; Jonathan J. Pincus

2013-05-20T23:59:59.000Z

130

On the Use of Atmospheric Pressure Plasma for the Bio-Decontamination of Polymers and Its Impact on Their Chemical and Morphological Surface Properties  

Science Journals Connector (OSTI)

Low temperature atmospheric pressure plasma processes can be applied to inactivate micro-...2 plasma of an atmospheric pressure plasma jet leads to an inactivation of Bacillus atrophaeus...spores with a maximum r...

K. Fricke; H. Tresp; R. Bussiahn; K. Schröder…

2012-08-01T23:59:59.000Z

131

Comparative study on the atmospheric pressure plasma jets of helium and Xian-Jun Shao, Nan Jiang, Guan-Jun Zhang, and Ze-xian Cao  

E-Print Network [OSTI]

Comparative study on the atmospheric pressure plasma jets of helium and argon Xian-Jun Shao, Nan spectroscopy characterization of gaseous atmospheric pressure plasmas with 2 mm spatial resolution Rev. Sci study on the atmospheric pressure plasma jets of helium and argon Xian-Jun Shao,1 Nan Jiang,2 Guan

Zexian, Cao

132

A Validated Liquid Chromatography-Atmospheric Pressure Chemical Ionization-Tandem Mass Spectrometry Method for Quantitation of Cocaine and Benzoylecgonine in Human Plasma  

Science Journals Connector (OSTI)

......Chromatography-Atmospheric Pressure Chemical...Benzoylecgonine in Human Plasma Shen-Nan Lin 1...chromatography-atmospheric pressure chemical...benzoylecgonine in human plasma. | In order to...ValidatedLiquidChromatography-Atmospheric PressureChemicalIonization...benzoylecgonine in human plasma.Cocaine-dsand......

Shen-Nan Lin; David E. Moody; George E. Bigelow; Rodger L. Foltz

2001-10-01T23:59:59.000Z

133

Silicon film formation by chemical transport in atmospheric-pressure pure hydrogen plasma  

Science Journals Connector (OSTI)

To prepare polycrystalline silicon (poly-Si) films at low temperatures ( atmospheric-pressure pure hydrogen plasma called the atmospheric-pressure enhanced chemical transport method. In this method high-pressure ( 200 – 760 Torr ) stable glow plasma of pure hydrogen was generated by a 150 MHz very high frequency power between the two parallel electrodes less than 2 mm apart. One of the electrodes is composed of the cooled Si solidsource and the other the heated substrate ( 200 – 400 ° C ) . According to the temperature dependence of hydrogen etching rate of Si Si H x species are mainly generated at the cooled Si solidsource by hydrogen atoms. These species are again decomposed in the plasma transported to the substrate to form Si films. In the present experiments on poly-Si film formation a high deposition rate of 300 nm ? min was achieved at 400 ° C and nearly ideal utilization efficiencies ( > 93 % ) of Si solidsource was realized in every condition. Si grains formed on a (001) Si substrate revealed anisotropic morphology elongated along ?110? directions and most of them had columnar structures epitaxially grown to the thickness of 2 ? m even at 200 ° C .

Hiromasa Ohmi; Hiroaki Kakiuchi; Yoshinori Hamaoka; Kiyoshi Yasutake

2007-01-01T23:59:59.000Z

134

Numerical study on microwave-sustained argon discharge under atmospheric pressure  

SciTech Connect (OSTI)

A numerical study on microwave sustained argon discharge under atmospheric pressure is reported in this paper. The purpose of this study is to investigate both the process and effects of the conditions of microwave-excited gas discharge under atmospheric pressure, thereby aiding improvements in the design of the discharge system, setting the appropriate working time, and controlling the operating conditions. A 3D model is presented, which includes the physical processes of electromagnetic wave propagation, electron transport, heavy species transport, gas flow, and heat transfer. The results can be obtained by means of the fluid approximation. The maxima of the electron density and gas temperature are 4.96?×?10{sup 18} m{sup ?3} and 2514.8?K, respectively, and the gas pressure remains almost unchanged for typical operating conditions with a gas flow rate of 20 l/min, microwave power of 1000 W, and initial temperature of 473?K. In addition, the conditions (microwave power, gas flow rate, and initial temperature) of discharge are varied to obtain deeper information about the electron density and gas temperature. The results of our numerical study are valid and clearly describe both the physical process and effects of the conditions of microwave-excited argon discharge.

Yang, Y.; Hua, W., E-mail: huaw@scu.edu.cn; Guo, S. Y. [School of Electronics and Information Engineering, Sichuan University, Chengdu 610065 (China)] [School of Electronics and Information Engineering, Sichuan University, Chengdu 610065 (China)

2014-04-15T23:59:59.000Z

135

Generation of non-thermal plasma at atmospheric pressure in hetero-phase media of air with water aerosol  

Science Journals Connector (OSTI)

The results of experimental investigations on non-thermal plasma generation using of high-voltage discharge in hetero-phase media of airflow at atmospheric pressure with liquid aerosol are presented in...B. subti...

Yu. S. Akishev; G. I. Aponin; M. E. Grushin…

2006-10-01T23:59:59.000Z

136

E. coli, P. aeruginosa, and B. cereus Bacteria Sterilization Using Afterglow of Non-Thermal Plasma at Atmospheric Pressure  

Science Journals Connector (OSTI)

We developed and employed a new geometrical structure of dielectric barrier discharge in atmospheric pressure for bacterial broad spectrum sterilization. We utilized a plasma source having an AC power supply at.....

Farshad Sohbatzadeh; Abasalt Hosseinzadeh Colagar…

2010-04-01T23:59:59.000Z

137

Atmospheric Pressure RF (13.56 MHz) Glow Discharge: Characterization and Application to “In Line” Waste Water Treatment  

Science Journals Connector (OSTI)

In this work the results obtained from the experimental study of an Atmospheric Pressure Glow Discharge (APGD) appear, generated in Helium (He) and dry air mixture by using a radio frequency (RF 13.56 MHz) pow...

Jaime B. Castro; Marlon H. Guerra-Mutis…

2003-06-01T23:59:59.000Z

138

The growth characteristics of microcrystalline Si thin film deposited by atmospheric pressure plasma-enhanced chemical vapor deposition  

Science Journals Connector (OSTI)

Microcrystalline silicon thin film was grown by atmospheric pressure plasma-enhanced chemical vapor deposition (AP-PECVD) ... with a cylindrical rotary electrode supplied with 150 MHz very-high-frequency power. T...

Jung-Dae Kwon

2013-11-01T23:59:59.000Z

139

Excitation frequency effects on atmospheric-pressure helium RF microplasmas: plasma density, electron energy and plasma impedance  

Science Journals Connector (OSTI)

...The effects of the driving RF frequency on the properties of low temperature atmospheric pressure helium microplasmas are discussed in light...?...m microdischarge driven at constant input power with a 10 MHz–...

K. McKay; F. Iza; M. G. Kong

2010-12-01T23:59:59.000Z

140

Atmospheric-Pressure Cold Plasma for Preparation of High Performance Pt/TiO2 Photocatalyst and Its Mechanism  

Science Journals Connector (OSTI)

Atmospheric-pressure dielectric barrier discharge (DBD) cold plasma was employed to fabricate Pt/TiO2 photocatalyst using the mixture of Ar and H2 as working gas. X-ray photoelectron microscopy (XPS) and transmis...

Lanbo Di; Xiuling Zhang; Zhijian Xu; Kai Wang

2014-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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

Near-surface modification of optical properties of fused silica by low-temperature hydrogenous atmospheric pressure plasma  

Science Journals Connector (OSTI)

In this Letter, we report on the near-surface modification of fused silica by applying a hydrogenous atmospheric pressure plasma jet at ambient temperature. A significant decrease in...

Gerhard, Christoph; Tasche, Daniel; Brückner, Stephan; Wieneke, Stephan; Viöl, Wolfgang

2012-01-01T23:59:59.000Z

142

Generation of Teflon-like layers on cellophane surfaces under atmospheric pressure non-equilibrium SF6-plasma environments  

Science Journals Connector (OSTI)

In this contribution a novel atmospheric pressure SF6–cold–plasma method is suggested for the conversion of... x , (x< 6 ) species generated in the discharge for oxygen extractio...

L. E. Cruz-Barba; S. Manolache; F. Denes

2003-07-01T23:59:59.000Z

143

Application of a Microwave-Induced Helium Plasma Detector at Atmospheric Pressure for Gas Chromatographic Capillary Columns  

Science Journals Connector (OSTI)

......microwave-induced plasma emission detector...microwave- induced plasma that operates at atmospheric pressure using helium...to within 1 cm of the plasma discharge. The quartz...Raytheon PGM-10X2 2450 MHz microwave power supply......

Stanley P. Wasik; Frederick P. Schwarz

1980-12-01T23:59:59.000Z

144

Influence of energy contributions to a high-voltage atmospheric-pressure discharge on the efficiency of conversion of ethanol  

Science Journals Connector (OSTI)

The results of experimental investigations of the conversion of ethanol in a high-voltage atmospheric-pressure discharge have been presented. The influence of the energy parameters of the discharge on the yield a...

S. A. Zhdanok; A. V. Krauklis; P. P. Samtsov…

2006-11-01T23:59:59.000Z

145

Absolute atomic oxygen density profiles in the discharge core of a microscale atmospheric pressure plasma jet  

Science Journals Connector (OSTI)

The micro atmospheric pressure plasma jet is an rf driven (13.56 MHz ? 20 ? W ) capacitively coupled discharge producing a homogeneous plasma at ambient pressure when fed with a gas flow of helium (1.4 slm) containing small admixtures of oxygen ( ? 0.5 % ) . The design provides excellent optical access to the plasma core. Ground state atomic oxygen densities up to 3 × 10 16 ? cm ? 3 are measured spatially resolved in the discharge core by absolutely calibrated two-photon absorption laser-induced fluorescence spectroscopy. The atomic oxygen density builds up over the first 8 mm of the discharge channel before saturating at a maximum level. The absolute value increases linearly with applied power.

Nikolas Knake; Kari Niemi; Stephan Reuter; Volker Schulz-von der Gathen; Jörg Winter

2008-01-01T23:59:59.000Z

146

Highly efficient oxidation of silicon at low temperatures using atmospheric pressure plasma  

Science Journals Connector (OSTI)

Silicon oxide ( Si O 2 ) layers were formed with initial oxidation rates in the range of 6.2 – 14.1 nm ? min in the temperature range of 150 – 400 ° C by oxidizing Si(001) wafers. Such a high-rate and low-temperature oxidation was realized by using a stable glow He ? O 2 plasma excited at atmospheric pressure by a 150 MHz very high-frequency power. Increasing the temperature led to both the higher oxidation rate and the better quality of Si O 2 and Si O 2 ? Si interface. The oxidation at 400 ° C showed an interface trap density of 6.2 × 10 10 eV ? 1 cm ? 2 which is considerably lower than that in a radical oxidation process using low-pressure He ? O 2 plasma at the same temperature.

Hiroaki Kakiuchi; Hiromasa Ohmi; Makoto Harada; Heiji Watanabe; Kiyoshi Yasutake

2007-01-01T23:59:59.000Z

147

Highly efficient oxidation of silicon at low temperatures using atmospheric pressure plasma  

SciTech Connect (OSTI)

Silicon oxide (SiO{sub 2}) layers were formed with initial oxidation rates in the range of 6.2-14.1 nm/min in the temperature range of 150-400 deg. C by oxidizing Si(001) wafers. Such a high-rate and low-temperature oxidation was realized by using a stable glow He/O{sub 2} plasma excited at atmospheric pressure by a 150 MHz very high-frequency power. Increasing the temperature led to both the higher oxidation rate and the better quality of SiO{sub 2} and SiO{sub 2}/Si interface. The oxidation at 400 deg. C showed an interface trap density of 6.2x10{sup 10} eV{sup -1} cm{sup -2}, which is considerably lower than that in a radical oxidation process using low-pressure He/O{sub 2} plasma at the same temperature.

Kakiuchi, Hiroaki; Ohmi, Hiromasa; Harada, Makoto; Watanabe, Heiji; Yasutake, Kiyoshi [Department of Precision Science and Technology, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871 (Japan)

2007-02-26T23:59:59.000Z

148

Differential sensitivity of lymphocyte subpopulations to non-thermal atmospheric-pressure plasma  

Science Journals Connector (OSTI)

Non-thermal atmospheric-pressure plasmas can possibly be used for several applications in particular in medicine. Plasma treatment can be applied to living tissues and cells, e.g., to induce apoptosis and growth arrest in tumour cells or to improve wound healing. However, detailed investigations of plasma–cell interactions are strongly needed. It is not yet clear whether plasmas will be useful in stimulating immune cells to change their behaviour or function. Therefore, this study focused on the influence of non-thermal atmospheric pressure plasma on cell surface molecules of rat spleen mononuclear cells (MNC) as first important step to gain insight into plasma–immune cells interactions. Rat spleen MNC were treated with plasma by surface dielectric barrier discharge (DBD) at atmospheric pressure in air or argon. Lymphocyte subpopulations and expression of L-selectin, ICAM-1 and LFA-1? expression on T-cells were analysed by flow cytometry 1–48 h after plasma treatment. Plasma changed the ratio of T- and B-cells in favour of B-cells. Of the T-cells the helper T-cells were reduced while cytotoxic T-cells were less affected. L-selectin expressing T-cells were significantly reduced already 1 h after plasma treatment and that of ICAM-1+ and LFA-1?+T-cells only after 4 h. These effects were time dependent and less dramatic when using DBD/argon plasma. In conclusion, different lymphocyte subpopulations show different sensitivity to plasma. Adhesion molecules as L-selectin, ICAM-1 and LFA-1? are down regulated by plasma. Whether these results can be used to modify lymphocyte homing or to activate MNC for different applications remains to be clarified.

Beate Haertel; Frauke Volkmann; Thomas von Woedtke; Ulrike Lindequist

2012-01-01T23:59:59.000Z

149

Deposition of vertically oriented carbon nanofibers in atmospheric pressure radio frequency discharge  

SciTech Connect (OSTI)

Deposition of vertically oriented carbon nanofibers (CNFs) has been studied in an atmospheric pressure radio frequency discharge without dielectric barrier covering the metallic electrodes. When the frequency is sufficiently high so that ions reside in the gap for more than one rf cycle ('trapped ions'), the operating voltage decreases remarkably and the transition from a uniform glow discharge to an arc discharge is suppressed even without dielectric barriers. More importantly, the trapped ions are able to build up a cathodic ion sheath. A large potential drop is created in the sheath between the bulk plasma and the electrode, which is essential for aligning growing CNFs. At the same time, the damage to CNFs due to ion bombardment can be minimized at atmospheric pressure. The primary interest of the present work is in identifying the cathodic ion sheath and investigating how it influences the alignment of growing CNFs in atmospheric pressure plasma-enhanced chemical-vapor deposition. Spectral emission profiles of He (706 nm), H{alpha} (656 nm), and CH (432 nm) clearly showed that a dark space is formed between the cathode layer and the heated bottom electrode. However, increasing the rf power induced the transition to a nonuniform {gamma}-mode discharge which creates intense plasma spots in the dark space. Aligned CNFs can be grown at moderate input power during the initial stage of the deposition process. Catalyst particles were heavily contaminated by precipitated carbon in less than 5 min. Alignment deteriorates as CNFs grow and deposition was virtually terminated by the deactivation of catalyst particles.

Nozaki, Tomohiro; Goto, Tomoya; Okazaki, Ken; Ohnishi, Kuma; Mangolini, Lorenzo; Heberlein, Joachim; Kortshagen, Uwe [Department of Mechanical and Control Engineering, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro Tokyo 1528552 (Japan); Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota 55455 (United States)

2006-01-15T23:59:59.000Z

150

Cellular and molecular responses of Neurospora crassa to non-thermal plasma at atmospheric pressure  

Science Journals Connector (OSTI)

Filamentous fungi have been rarely explored in terms of plasma treatments. This letter presents the cellular and molecular responses of the filamentous fungus Neurospora crassa to an argon plasma jet at atmospheric pressure. The viability and cell morphology of N. crassaspores exposed to plasma were both significantly reduced depending on the exposure time when treated in water. The intracellular genomicDNA content was dramatically reduced in fungal tissues after a plasma treatment and the transcription factor tah-3 was found to be required for fungal tolerance to a harsh plasma environment.

Gyungsoon Park; Young H. Ryu; Young J. Hong; Eun H. Choi; Han S. Uhm

2012-01-01T23:59:59.000Z

151

Chemical filters by non-thermal atmospheric pressure plasmas for reactive fields  

Science Journals Connector (OSTI)

Non-thermal plasmas in electrode configurations are designed in this study and investigated at atmospheric pressure for generation of reactive fields. A combination of insulated wire electrodes and bare metal wire electrodes makes it possible to obtain a filter-like assembly of microplasmas, even in ambient air or in aqueous solutions. Oxidation and reduction fields are obtained by controlling the gas supply of hydrogen, oxygen, and water vapor, and these fields benefit various functional processes such as recycling CO2, decomposing organic molecules, and increasing the work function on metal surfaces.

Osamu Sakai; Tadasuke Morita; Yoshihiko Ueda; Noriaki Sano; Kunihide Tachibana

2011-01-01T23:59:59.000Z

152

Generation of pulse-modulated induction thermal plasma at atmospheric pressure  

Science Journals Connector (OSTI)

The radio frequency induction thermal plasma of sufficiently high electric power for materials processing has been successfully generated with a pulsemodulated operating condition. A solid-stateamplifier which supplies the electric power with a nominal frequency of 1 MHz was employed for the pulsing plasma generation. The Ar–H 2 plasma was generated at a high power level of 17 kW at atmospheric pressure. Typically the plasma remained stable until the pulse duty factor went down to 30% when the period of the high power level was 5 ms and the low power level was about 6 kW.

Takamasa Ishigaki; Xiaobao Fan; Tadahiro Sakuta; Toshiyuki Banjo; Yukihito Shibuya

1997-01-01T23:59:59.000Z

153

Properties of dielectric-barrier-free atmospheric pressure microplasma driven by submicrosecond dc pulse voltage  

SciTech Connect (OSTI)

Atmospheric pressure microplasma driven by dc pulse is developed. This device has a simple structure comprised of a flowing helium (He) feed gas and dielectric-free metal electrodes without an external current limiting resistor. It is shown that a stable glow mode plasma can be sustained without arc runaway by limiting the voltage pulse width to shorter than 300 ns. The properties of the device are reported in terms of discharge current waveforms, rotational temperature of N{sub 2}{sup +}, and spatiotemporally resolved optical emission characteristics.

Ha, Chang-Seung; Choi, Joon-Young; Kim, Dong-Hyun; Park, Chung-Hoo; Lee, Hae June; Lee, Ho-Jun [Department of Electrical Engineering, Pusan National University, Busan 609-735 (Korea, Republic of)

2009-08-10T23:59:59.000Z

154

Spectroscopic study of a long high-electron-density argon plasma column generated at atmospheric pressure  

SciTech Connect (OSTI)

A stable plasma column is generated in a quartz tube using a pair of hollow electrodes driven by a sinusoidal power supply of 45 kHz at atmospheric pressure in argon. Two distinct operating modes (low-current and high-current modes) are identified through observing its discharge phenomena, measuring its electrical characteristics, and determining the gas temperatures by spectroscopic diagnosis of Q branch of UV OH spectrum. The electron density in the high-current mode is diagnosed by Stark broadening and is found to be two orders higher than that in low-current mode.

Li Shouzhe; Huang Wentong; Wang Dezhen [Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, and School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116023 (China)

2010-02-15T23:59:59.000Z

155

E-Print Network 3.0 - atmospheric pressure nitrogen Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

study over the temperature range... studied for comparison with oxygen and nitrogen adsorption over the pressure range 0-1.8 kPa for pressure... is the industrial separation of...

156

Electrical studies and plasma characterization of an atmospheric pressure plasma jet operated at low frequency  

Science Journals Connector (OSTI)

Low-temperature high-pressure plasma jets have an extensive use in medical and biological applications. Much work has been devoted to study these applications while comparatively fewer studies appear to be directed to the discharge itself. In this work in order to better understand the kind of electrical discharge and the plasma states existing in those devices a study of the electrical characteristics of a typical plasma jet operated at atmospheric pressure using either air or argon is reported. It is found that the experimentally determined electrical characteristics are consistent with the model of a thermal arc discharge with a highly collisional cathode sheet. The only exception is the case of argon at the smallest electrode separation studied around 1?mm in which case the discharge is better modeled as either a non-thermal arc or a high-pressure glow. Also variations of the electrical behavior at different gas flow rates are interpreted consistently with the arc model in terms of the development of fluid turbulence in the external jet.

2013-01-01T23:59:59.000Z

157

Development of Antimicrobial Coatings by Atmospheric Pressure Plasma Using a Guanidine-Based Precursor  

Science Journals Connector (OSTI)

Atmospheric pressure plasmas have been utilized in the engineering of antimicrobial materials, where their applications ranged from surface pretreatment of substrates for enhanced bonding of silver nanoparticles or antimicrobial agents in imparting antimicrobial behavior on surfaces spanning from pretreatments of substrate materials(13, 14) and very recently, deposition and/or plasma polymerization of antimicrobial polymers using monomer precursors. ... (20) Similar results of oxidized polar groups such as hydroxyls, carbonyls, and carboxyl groups on the surfaces of UHMWPE films from water vapor plasma treatments have been reported by Rodriguez-Santiago et al.(21) Also, reactive species such as ozone, O2, and O generated from plasma interactions with air from open atmosphere are also an underlying source of oxygen-bearing groups. ...

Jacqueline H. Yim; Michelle S. Fleischman; Victor Rodriguez-Santiago; Lars T. Piehler; André A. Williams; Julia L. Leadore; Daphne D. Pappas

2013-10-29T23:59:59.000Z

158

Laser-rf creation and diagnostics of seeded atmospheric pressure air and nitrogen plasmas  

Science Journals Connector (OSTI)

A laser initiation and radio frequency (rf) sustainment technique has been developed and improved from our previous work to create and sustain large-volume high-pressure air and nitrogen plasmas. This technique utilizes a laser-initiated 15 mTorr partial pressure tetrakis (dimethylamino) ethylene seed plasma with a 75 Torr background gas pressure to achieve high-pressure air/nitrogen plasma breakdown and reduce the rf power requirement needed to sustain the plasma. Upon the laser plasma initiation the chamber pressure is raised to 760 Torr in 0.5 s through a pulsed gas valve and the end of the chamber is subsequently opened to the ambient air. The atmospheric-pressure plasma is then maintained with the 13.56 MHz rf power. Using this technique large-volume ( 1000 ? cm 3 ) high electron density (on the order of 10 11 – 12 ? cm ? 3 ) 760 Torr air and nitrogen plasmas have been created while rf power reflection is minimized during the entire plasma pulse utilizing a dynamic matching method. This plasma can project far away from the antenna region (30 cm) and the rf power budget is 5 ? W / cm 3 . Temporal evolution of the plasma electron density and total electron-neutral collision frequency during the pulsed plasma is diagnosed using millimeter waveinterferometry. Optical emission spectroscopy(OES) aided by SPECAIR a special OES simulation program for air-constituent plasmas is used to analyze the radiating species and thermodynamic characteristics of the plasma. Rotational and vibrational temperatures of 4400 – 4600 ± 100 ? K are obtained from the emission spectra from the N 2 ( 2 + ) and N 2 + ( 1 ? ) transitions by matching the experimental spectrum results with the SPECAIR simulation results. Based on the relation between the electron collision frequency and the neutral density utilizing millimeter waveinterferometry the electron temperature of the 760 Torr nitrogen plasma is found to be 8700 ± 100 ? K ( 0.75 ± 0.1 ? eV ) . Therefore the plasma deviates significantly from local thermal equilibrium.

Siqi Luo; C. Mark Denning; John E. Scharer

2008-01-01T23:59:59.000Z

159

Laser-rf creation and diagnostics of seeded atmospheric pressure air and nitrogen plasmas  

SciTech Connect (OSTI)

A laser initiation and radio frequency (rf) sustainment technique has been developed and improved from our previous work to create and sustain large-volume, high-pressure air and nitrogen plasmas. This technique utilizes a laser-initiated, 15 mTorr partial pressure tetrakis (dimethylamino) ethylene seed plasma with a 75 Torr background gas pressure to achieve high-pressure air/nitrogen plasma breakdown and reduce the rf power requirement needed to sustain the plasma. Upon the laser plasma initiation, the chamber pressure is raised to 760 Torr in 0.5 s through a pulsed gas valve, and the end of the chamber is subsequently opened to the ambient air. The atmospheric-pressure plasma is then maintained with the 13.56 MHz rf power. Using this technique, large-volume (1000 cm{sup 3}), high electron density (on the order of 10{sup 11-12} cm{sup -3}), 760 Torr air and nitrogen plasmas have been created while rf power reflection is minimized during the entire plasma pulse utilizing a dynamic matching method. This plasma can project far away from the antenna region (30 cm), and the rf power budget is 5 W/cm{sup 3}. Temporal evolution of the plasma electron density and total electron-neutral collision frequency during the pulsed plasma is diagnosed using millimeter wave interferometry. Optical emission spectroscopy (OES) aided by SPECAIR, a special OES simulation program for air-constituent plasmas, is used to analyze the radiating species and thermodynamic characteristics of the plasma. Rotational and vibrational temperatures of 4400-4600{+-}100 K are obtained from the emission spectra from the N{sub 2}(2+) and N{sub 2}{sup +}(1-) transitions by matching the experimental spectrum results with the SPECAIR simulation results. Based on the relation between the electron collision frequency and the neutral density, utilizing millimeter wave interferometry, the electron temperature of the 760 Torr nitrogen plasma is found to be 8700{+-}100 K (0.75{+-}0.1 eV). Therefore, the plasma deviates significantly from local thermal equilibrium.

Luo Siqi; Denning, C. Mark; Scharer, John E. [Electrical and Computer Engineering, University of Wisconsin--Madison, Madison, Wisconsin 53705 (United States)

2008-07-01T23:59:59.000Z

160

Formation and characterization of hydrophobic glass surface treated by atmospheric pressure He/CH4 plasma  

Science Journals Connector (OSTI)

Atmospheric pressure helium plasmas generated in the open air by 13.56?MHz rf power were applied for the glass surface wettability modification. The plasma gas temperature measured by the spectroscopic method was under 400?K which is low enough to treat the samples without thermal damages. The hydrophobicity of the samples determined by the water droplet contact angle method was dependent on the methane gas content and the plasma exposure time. Adding the methane gas by a small amount of 0.25% the contact angle was remarkably increased from 10° to 83° after the 10 s plasma treatment. From the analysis of the treated surface and the plasma it was shown that the deposition of alkane functional groups such as C-H stretch CH2 bend and CH3 bend was one of the contributing factors for the hydrophobicity development. In addition the hydrophobic properties lasted over 2 months even after the single treatment. From the results the atmospheric pressure plasma treatment promises the fast and low-cost method for the thermally-weak surface modification.

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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.
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161

Atmospheric-pressure plasma cleaning of contaminated surfaces. 1998 annual progress report  

SciTech Connect (OSTI)

'The object of this research program is to develop an atmospheric-pressure plasma jet for converting transuranic wastes (TRUs) into low-level radioactive wastes (LLWs). This plasma process will be used to efficiently decontaminate a wide range of structures and equipment. This report summarizes work after 1 year and 9 months of a 3-year project. A picture of the atmospheric-pressure plasma jet is shown in Fig. 1. This new plasma source consists of two concentric electrodes through which a mixture of helium and reactive gases flow. The plasma is ignited by applying 13.56 MHz RF power to the inner electrode. The characteristics of this discharge are different from other atmospheric-pressure plasmas, such as transferred arcs, torches, coronas and silent discharges. Shown in Fig. 2 is the current-voltage curve for the plasma jet. Spark breakdown occurs at 0.01 A, and is proceeded by a normal glow region, in which the voltage remains constant with increasing current, and an abnormal glow region, in which the voltage increases rapidly with current. At about 1.0 A and 225 V, the plasma begins to arc. The normal glow region is rarely observed in atmospheric pressure plasmas. They usually proceed directly from spark breakdown to arcing. The trend shown in the figure indicates that the plasma jet is stable over a wide range of operating conditions. The distribution of reactive species in a plasma jet, containing oxygen and helium, has been characterized by Langmuir probe measurements, optical emission spectroscopy, and ultraviolet absorption spectroscopy. The charged particle density ranges from about 5 x 10{sup 11} cm{sup -3} inside the plasma to 1 x 10{sup 10} cm{sup -3} in the jet exit. The concentration of metastable oxygen molecules (a 1 Dg and b 1 Sg{sup +} ) is estimated to be between 10{sup 12} to 10{sup 13} cm{sup -3} . By contrast, the ozone concentration increases from about 5 x 10{sup 14} cm{sup -3} inside the plasma to 1 x 10{sup 16} cm{sup -3} in the effluent. The ozone molecules are produced by the reaction of O atoms with O{sub 2} molecules: O + O{sub 2} + M a O{sub 3} + M. To generate the amount of ozone observed, the O atom concentration in the plasma must be near 1 x 10{sup 16} cm{sup -3}, or about 10% of the oxygen fed. These results are quite unexpected, because most non-equilibrium, low-temperature plasmas achieve a much lower degree of dissociation. The etching of actinide metals has been simulated by using tantalum as a surrogate material. Tantalum etching rates of up to 1.2 mm/min are achieved with the plasma jet using a CF{sub 4}/O{sub 2}/He gas feed. This is 10 times faster than conventional plasma systems, and indicates that the atmospheric-pressure plasma is a promising technology for decontamination of DOE sites. Finally, the plasma jet has been successfully modified to process larger areas, up to about 1.0 ft{sup 2} . Work is underway to increase the process scale further. The authors are confident that this technology is capable of being adapted for decontamination operations in the field.'

Hicks, R.F. [Univ. of California, Los Angeles, CA (US); Selwyn, G. [Los Alamos National Lab., NM (US)

1998-06-01T23:59:59.000Z

162

Pressure transducer  

DOE Patents [OSTI]

A pressure transducer suitable for use in high temperature environments includes two pairs of induction coils, each pair being bifilarly wound together, and each pair of coils connected as opposite arms of a four arm circuit; an electrically conductive target moveably positioned between the coil pairs and connected to a diaphragm such that deflection of the diaphragm causes axial movement of the target and an unbalance in the bridge output.

Anderson, Thomas T. (Downers Grove, IL); Roop, Conard J. (Lockport, IL); Schmidt, Kenneth J. (Midlothian, IL); Gunchin, Elmer R. (Lockport, IL)

1989-01-01T23:59:59.000Z

163

The Interactions between Non-thermal Atmospheric Pressure Plasma and Ex-vivo Dermal Fibroblasts  

Science Journals Connector (OSTI)

Abstract The cold atmospheric plasma (CAPs) is the fourth state of matter, which means that it is an ionized gas, obtained at room temperature and atmospheric pressure when energy is supplied to a gas. Its composition is complex, involving chemical (gas's molecules, free radicals, ions and electrons) and physical (Ultra-violet radiation and electric field) components. It has been successfully used in the industry for the processing of materials and the recent discovery of its efficacy in sterilization of microorganisms has trigged a large quantity of research in the biomedical field. The expectations of good that the \\{CAPs\\} may bring to medical treatments are high and therefore this study analyzes the effects caused by cold atmospheric pressure plasma in ex-vivo dermal fibroblasts. For that, fibroblast cell culture was obtained from ex-vivo human skin and treated with different conditions of CAPs, such as treatment type (direct or indirect). This work aimed to determine if ex-vivo human fibroblasts remain viable after these treatments. For that, we counted the number of cells right after the experiments and compared it with the control, which did not receive any kind of plasma. For further results we also counted the number of viable cells 3 and 5 days after the application. The fibroblasts were treated with 85W plasma, from 30 seconds up to 60 seconds. Our findings show that \\{CAPs\\} obtained from Argon gas can be applied to in-house human fibroblasts culture directly and indirectly without altering the cells’ viability. It does not cause apoptosis in all of the cells treated nor does it exacerbate its proliferation. Further studies need to be done in order to analyze if it alters the cells’ functionality.

Bruno Bellotti Lopes; Maria Beatriz de Paula Leite Kraft; Jussara Rehder; Fabiana Regina Xavier Batista; Maria Beatriz Puzzi

2013-01-01T23:59:59.000Z

164

Atmospheric pressure plasma cleaning of contamination surfaces. 1997 mid-year progress report  

SciTech Connect (OSTI)

'Goals of the project are to (1) identify the key physics and chemistry underlying the use of high pressure plasmas for etching removal of actinides and actinide surrogates; and (2) identify key surface reactions and plasma physics necessary for optimization of the atmospheric pressure plasma jet. Technical description of the work decommissioning of transuranic waste (TRU) into low-level radioactive waste (LLW) represents the largest cleanup cost associated with the nuclear weapons complex. This work is directed towards developing a low-cost plasma technology capable of converting TRU into LLW, based upon highly selective plasma etching of plutonium and other actinides from contaminated surfaces. In this way, only the actinide material is removed, leaving the surface less contaminated. The plasma etches actinide material by producing a volatile halide compound, which may be efficiently trapped using filters. To achieve practical, low-cost operation of a plasma capable of etching actinide materials, the authors have developed a y-mode, resonant-cavity, atmospheric pressure plasma jet (APPJ). In contrast to conventional, low pressure plasmas, the APPJ produces a purely-chemical effluent free of ions, and so achieves very high selectivity and produces negligible damage to the surface. Since the jet operates outside a chamber, many nuclear wastes may be treated including machinery, duct-work, concrete and other building materials. In some cases, it may be necessary to first remove paint from contaminated surfaces using a plasma selective for that surface, then to switch to the actinide etching chemistry for removal of actinide contamination. The goal of this work is to develop the underlying science required for maturation of this technology and to establish early version engineering prototypes. Accomplishments to Date The authors have made significant progress in this program. The work conducted jointly at Los Alamos and at UCLA. This has been facilitated by exchange of people, equipment and designs between the two locations. The study can be divided into three (3) components: (1) source design, operation and physics, (2) effluent characterization and analysis, (3) surface reactions and decontamination. Some of the key accomplishments in each area are noted.'

Selwyn, G.S. [Los Alamos National Lab., NM (US); Hicks, R. [Univ. of California, Los Angeles, CA (US)

1997-06-01T23:59:59.000Z

165

Decontamination of chemical and biological warfare (CBW) agents using an atmospheric pressure plasma jet (APPJ)  

Science Journals Connector (OSTI)

The atmospheric pressure plasma jet (APPJ) [A. Schütze et al. IEEE Trans. Plasma Sci. 26 1685 (1998)] is a nonthermal high pressure uniform glowplasmadischarge that produces a high velocity effluent stream of highly reactive chemical species. The discharge operates on a feedstock gas (e.g. He/O 2 /H 2 O ) which flows between an outer grounded cylindrical electrode and an inner coaxial electrode powered at 13.56 MHz rf. While passing through the plasma the feedgas becomes excited dissociated or ionized by electron impact. Once the gas exits the discharge volume ions and electrons are rapidly lost by recombination but the fast-flowing effluent still contains neutral metastable species (e.g. O 2 * He * ) and radicals (e.g. O OH). This reactive effluent has been shown to be an effective neutralizer of surrogates for anthrax spores and mustard blister agent. Unlike conventional wet decontamination methods the plasma effluent does not cause corrosion and it does not destroy wiring electronics or most plastics making it highly suitable for decontamination of sensitive equipment and interior spaces. Furthermore the reactive species in the effluent rapidly degrade into harmless products leaving no lingering residue or harmful by-products.

H. W. Herrmann; I. Henins; J. Park; G. S. Selwyn

1999-01-01T23:59:59.000Z

166

Modeling and Data Needs of Atmospheric Pressure Gas Plasma and Biomaterial Interaction  

SciTech Connect (OSTI)

Non-thermal atmospheric pressure plasmas have received considerable attention recently. One promising application of non-thermal plasma devices appears to be biomaterial and biomedical treatment. Various biological and medical effects of non-thermal plasmas have been observed by a variety of investigators, including bacteria sterilization, cell apoptosis, and blood coagulation, among others. The mechanisms of the plasma-biomaterial interaction are however only poorly understood. A central scientific challenge is therefore how to answer the question: 'What plasma-generated agents are responsible for the observed biological effects?' Our modeling efforts are motivated by this question. In this paper, we review our modeling results of the plasma needle discharge. Then, we address data needs for further modeling and understanding of plasma-biomaterial interaction.

Sakiyama, Yukinori; Graves, David B. [Department of Chemical Engineering, University of California at Berkeley, Berkeley, CA 94720 (United States)

2009-05-02T23:59:59.000Z

167

Modeling and Data Needs of Atmospheric Pressure Gas Plasma and Biomaterial Interaction  

Science Journals Connector (OSTI)

Non?thermal atmospheric pressure plasmas have received considerable attention recently. One promising application of non?thermal plasma devices appears to be biomaterial and biomedical treatment. Various biological and medical effects of non?thermal plasmas have been observed by a variety of investigators including bacteria sterilization cell apoptosis and blood coagulation among others. The mechanisms of the plasma?biomaterial interaction are however only poorly understood. A central scientific challenge is therefore how to answer the question: “What plasma?generated agents are responsible for the observed biological effects?” Our modeling efforts are motivated by this question. In this paper we review our modeling results of the plasma needle discharge. Then we address data needs for further modeling and understanding of plasma?biomaterial interaction

Yukinori Sakiyama; David B. Graves

2009-01-01T23:59:59.000Z

168

Synthesis of Ozone at Atmospheric Pressure by a Quenched Induction-Coupled Plasma Torch  

SciTech Connect (OSTI)

The technical feasibility of using an induction-coupled plasma (ICP) torch to synthesize ozone at atmospheric pressure is explored. Ozone concentrations up to ~250 ppm were produced using a thermal plasma reactor system based on an ICP torch operating at 2.5 MHz and ~11 kVA with an argon/oxygen mixture as the plasma-forming gas. A gaseous oxygen quench formed ozone by rapid mixing of molecular oxygen with atomic oxygen produced by the torch. The ozone concentration in the reaction chamber was measured by Fourier Transform infrared (FTIR) spectroscopy over a wide range of experimental configurations. The geometry of the quench gas flow, the quench flow velocity, and the quench flow rate played important roles in determining the ozone concentration. The ozone concentration was sensitive to the torch RF power, but was insensitive to the torch gas flow rates. These observations are interpreted within the framework of a simple model of ozone synthesis.

A. Blutke; B.C. Stratton; D.R. Mikkelsen; J. Vavruska; R. Knight

1998-01-01T23:59:59.000Z

169

Influence of oxygen traces on an atmospheric-pressure radio-frequency capacitive argon plasma discharge  

Science Journals Connector (OSTI)

An atmospheric-pressure capacitive discharge source driven by radio-frequency power supply at 13.56 MHz has been developed experimentally that is capable of producing a homogeneous and cold glow discharge in O2/Ar. With respect to the influence of oxygen component when diluted into argon plasmadischarge on the dischargecharacteristics the measurements of the electrical parameters (impedance phase angle resistance and reactance) are made systematically and the densities of the metastable and resonant state of argon are determined by means of optical emission spectroscopy(OES). It is shown that the admixture of oxygen into argon plasma not only changes the electric characteristics but also alters the optical emission spectra greatly due to strong interaction between the oxygen content and the argon in the plasma environment.

Shou-Zhe Li; Qi Wu; Wen Yan; Dezhen Wang; Han S. Uhm

2011-01-01T23:59:59.000Z

170

Enhancing polymer adhesion through surface activation using an in-line atmospheric pressure plasma  

Science Journals Connector (OSTI)

A reel-to-reel atmospheric pressure plasma treatment system known as Lablineâ?¢, was used to activate the surface of Polypropylene (PP) and Polyethylene Terephthalate (PET). An epoxy adhesive was used to bond the activated polymers and the bond strength was assessed using the tensile lap shear test method. For PP treated in a helium discharge at 900 W a fivefold increase in adhesive bond strength was observed compared with that of the untreated polymer. The effect of adding nitrogen and oxygen into the helium plasma was examined, both with respect to the bond strength of the epoxy and polymer surface energy. An 18-fold increase in adhesive strength was observed after the treatment of PP in a helium/oxygen plasma, while a threefold increase was observed for PET. A similar increase in adhesion was observed for PET treated in a helium/nitrogen plasma, while a 16-fold increase in adhesion was obtained for PP.

John Tynan; Denis P. Dowling; Gerald Byrne; Donal Hughes

2007-01-01T23:59:59.000Z

171

A large gap of radio frequency dielectric barrier atmospheric pressure glow discharge  

SciTech Connect (OSTI)

A large gap was acquired between electrodes (up to 5.5 mm) of Ar atmospheric pressure glow discharge in radio frequency dielectric barrier discharge (rf-DBD). The discharge of Ar plasma was characterized by I-V curve and Lissajous plot, and the effective power of the discharge was calculated based on the measured Lissajous plot and found to be higher than 90% of the input power. To gain a thorough understanding of the mechanism, the rf-DBD with a single dielectric barrier layer operating in gamma mode glow discharge of N{sub 2} plasma was diagnosed in spatial resolution through optical emission spectroscopy. It was concluded that secondary electron emission might be responsible for the sustainable glow discharge in the large gap rf-DBD plasma.

Li, B.; Chen, Q.; Liu, Z. W. [Laboratory of Plasma Physics and Materials, Beijing Institute of Graphic Communication, Beijing 102600 (China)

2010-01-25T23:59:59.000Z

172

Production of atmospheric-pressure glow discharge in nitrogen using needle-array electrode  

SciTech Connect (OSTI)

An atmospheric pressure glow discharge was generated using a needle-array electrode in nitrogen, and the voltage-current characteristics of the glow discharge were obtained in a range from 1 mA to 60 A. A pulsed high voltage with short rise time under 10 ns was employed to generate streamer discharges simultaneously at all needle tips. The large number of streamer discharges prevented the glow-to-arc transition caused by inhomogeneous thermalization. Semiconductor opening switch diodes were employed as an opening switch to shorten the rise time. The glow voltage was almost constant until the discharge current became 0.3 A, whereas the voltage increased with the current higher than 0.3 A. Electron density and temperature in a positive column of the glow discharge at 60 A were obtained to 1.4x10{sup 12} cm{sup -3} and 1.3 eV from calculation based on nitrogen swarm data.

Takaki, K.; Hosokawa, M.; Sasaki, T.; Mukaigawa, S.; Fujiwara, T. [Department of Electrical and Electronic Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551 (Japan)

2005-04-11T23:59:59.000Z

173

Driving frequency effects on the characteristics of atmospheric pressure capacitive helium discharge  

SciTech Connect (OSTI)

Atmospheric pressure helium discharge characteristics were investigated for varying driving radio frequencies in the range between 1.86 and 27.1 MHz. As the driving frequency is raised, both gas breakdown and {alpha}-{gamma} transition voltages decrease due to the reduction in the electron drift loss. In addition, different discharge features such as normal, abnormal, {alpha}, and {gamma} modes show certain dependences on the frequency. Using a simple circuit model, the changes in sheath thickness from 2.35 to 0.11 mm, electron density from 0.26 to 15.6x10{sup 11} cm{sup -3} was obtained by raising the frequency from 1.86 to 27.1 MHz.

Moon, Se Youn; Kim, D. B.; Gweon, B.; Choe, W. [Department of Physics, Korea Advanced Institute of Science and Technology, 335 Gwahangno, Yuseong-gu, Daejeon 305-701 (Korea, Republic of)

2008-12-01T23:59:59.000Z

174

Two-phase flow visualization in a transparent, atmospheric pressure, boiling water loop  

SciTech Connect (OSTI)

The Simulant Boiling Flow Visualization (SBFV) loop, a transparent, atmospheric pressure test apparatus employing boiling water as a simulant for boiling liquid sodium, has been designed and operated at Oak Ridge National Laboratory. The objective of testing in this loop has been to study two-phase flow behavior that is phenomenologically similar to that observed in sodium boiling experiments, as part of the US Department of Energy Breeder Reactor Safety Program. A detailed description of the design of the SBFV loop is presented, as well as experimental results that show the similarity between low-power boiling behavior in water and liquid sodium. Future tests are planned in a seven-pin flow visualization bundle that will be installed in the SBFV loop. The design of this bundle is also discussed.

Levin, A.E.; Carbajo, J.J.; Montgomery, B.H.; Wantland, J.L.

1985-01-01T23:59:59.000Z

175

XAFS Measurements under Atmospheric Pressure in the Soft X-ray Region  

SciTech Connect (OSTI)

We have developed a compact experimental set-up for X-ray absorption fine structure (XAFS) measurements in He at atmospheric pressure (AP) in the soft X-ray region and used it for Mg and Cl K-edge XAFS measurements of MgCl{sub 2} and MgCl{sub 2{center_dot}}6H{sub 2}O. The spectra of MgCl{sub 2{center_dot}}6H{sub 2}O measured in He at AP were significantly different from those measured in vacuum. This suggests the importance of performing soft X-ray XAFS experiments under AP to obtain reliable spectra from hydrated compounds.

Nakanishi, Koji; Ohta, Toshiaki [SR center, Ritsumeikan University, Noji-Higashi, Kusatsu, Shiga, 525-8577 (Japan); Yagi, Shinya [School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603 (Japan)

2010-06-23T23:59:59.000Z

176

Electron density and temperature measurement by continuum radiation emitted from weakly ionized atmospheric pressure plasmas  

SciTech Connect (OSTI)

The electron-atom neutral bremsstrahlung continuum radiation emitted from weakly ionized plasmas is investigated for electron density and temperature diagnostics. The continuum spectrum in 450–1000?nm emitted from the argon atmospheric pressure plasma is found to be in excellent agreement with the neutral bremsstrahlung formula with the electron-atom momentum transfer cross-section given by Popovi?. In 280–450?nm, however, a large discrepancy between the measured and the neutral bremsstrahlung emissivities is observed. We find that without accounting for the radiative H{sub 2} dissociation continuum, the temperature, and density measurements would be largely wrong, so that it should be taken into account for accurate measurement.

Park, Sanghoo; Choe, Wonho, E-mail: wchoe@kaist.ac.kr [Department of Physics, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701 (Korea, Republic of); Youn Moon, Se [High-enthalpy Plasma Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 561-756 (Korea, Republic of); Park, Jaeyoung [5771 La Jolla Corona Drive, La Jolla, CA 92037 (United States)

2014-02-24T23:59:59.000Z

177

A High-Performance Liquid Chromatographic-Atmospheric Pressure Chemical Ionization-Tandem Mass Spectrometric Method for Determination of Risperidone and 9-Hydroxyrisperidone in Human Plasma  

Science Journals Connector (OSTI)

......Chromatographic-Atmospheric Pressure Chemical...9-Hydroxyrisperidone in Human Plasma David E. Moody...spec- trometry and atmospheric pressure chemical...or polar drugs in plasma. Ther. Drug Monit...their metabolites in plasma by liquid chromatography...spectrometry with atmospheric pres- sure chemical......

David E. Moody; John D. Laycock; Wei Huang; Rodger L. Foltz

2004-09-01T23:59:59.000Z

178

Estimation of point of zero charge for activated carbon treated with atmospheric pressure non-thermal oxygen plasmas  

Science Journals Connector (OSTI)

Commercial activated carbon was treated with a non-thermal oxygen plasma under atmospheric pressure using three types of reactors: a dielectric barrier discharge (DBD) parallel-plate reactor; an atmospheric pressure glow discharge plasma jet reactor and a DBD coaxial type reactor. The samples treated with the plasma were characterized by the pH value at the point of zero charge. An estimation of the adsorption properties of samples for copper ions in aqueous solution was also carried out in order to explain the effect of pH value on the adsorption results.

Satoshi Kodama; Hidetoshi Sekiguchi

2006-01-01T23:59:59.000Z

179

Application of atmospheric-pressure non-thermal plasma to chlorination of hardly soluble materials  

Science Journals Connector (OSTI)

Abstract The chlorination reaction in which hardly soluble materials are chemically converted into soluble chlorides by atmospheric-pressure non-thermal plasma (APNTP) and the effect of the plasma-irradiation conditions on the chlorination reaction were investigated. The CeO2 specimens, which have the same crystallographic structure (CaF2 type, cubic) and valence fluctuation behavior as ThO2, were used to simulate hardly soluble nuclear materials. \\{CCl4\\} and He mixed gas were used as the plasma discharge. The emission and electrical properties of APNTP and dissolution behaviors of chloride generated by plasma irradiation were evaluated. The results of the emission spectroscopic analysis and electrical property measurements showed that chlorine and carbon were generated from the decomposition of \\{CCl4\\} caused by the excited atmospheric components and He. Moreover, the production of CeCl3 from CeO2 and a logarithmic progression of the chlorination reaction were indicated with increasing plasma-irradiation time.

Toru Kitagaki; Tatsuya Suzuki; Toshitaka Kaneshiki; Masao Nomura

2014-01-01T23:59:59.000Z

180

Array of surface-confined glow discharges in atmospheric pressure helium: Modes and dynamics  

Science Journals Connector (OSTI)

Array of atmospheric pressure surface discharges confined by a two-dimensional hexagon electrode mesh is studied for its discharge modes and temporal evolution so as to a theoretical underpinning to their growing applications in medicine aerodynamic control and environmental remediation. Helium plasma surface-confined by one hexagon-shaped rim electrode is shown to evolve from a Townsend mode to a normal and abnormal glow mode and its evolution develops from the rim electrodes as six individual microdischarges merging in the middle of the hexagon mesh element. Within one hexagon element microdischarges remain largely static with the mesh electrode being the instantaneous cathode but move towards the hexagon center when the electrode is the instantaneous anode. On the entire array electrode surface plasma ignition is found to beat an unspecific hexagon element and then spreads to ignite surrounding hexagon elements. The spreading of microdischarges is in the form of an expanding circle at a speed of about 3?×?104 m/s and their quenching starts in the location of the initial plasma ignition. Plasma modes influence how input electrical power is used to generate and accelerate electrons and as such the reaction chemistry whereas plasma dynamics are central to understand and control plasma instabilities. The present study provides an important aspect of plasma physics of the atmospheric surface-confined discharge array and a theoretical underpinning to its future technological innovation.

M. G. Kong

2014-01-01T23:59:59.000Z

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181

Langmuir probe diagnostics of an atmospheric pressure, vortex–stabilized nitrogen plasma jet  

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Langmuir probemeasurements in an atmospheric pressure direct current (dc) plasma jet are reported. Sweeping probes were used. The experiment was carried out using a dc non–transferred arc torch with a rod–type cathode and an anode of 5?mm diameter. The torch was operated at a nominal power level of 15?kW with a nitrogen flow rate of 25 Nl min?1. A flat ion saturation region was found in the current–voltage curve of the probe. The ion saturation current to a cylindrical probe in a high–pressure non local thermal equilibrium (LTE)plasma was modeled. Thermal effects and ionization/recombination processes inside the probe perturbed region were taken into account. Averaged radial profiles of the electron and heavy particle temperatures as well as the electron density were obtained. An electron temperature around 11?000?K a heavy particle temperature around 9500?K and an electron density of about 4?×?1022?m?3 were found at the jet centre at 3.5?mm downstream from the torch exit. Large deviations from kinetic equilibrium were found throughout the plasma jet. The electron and heavy particle temperature profiles showed good agreement with those reported in the literature by using spectroscopic techniques. It was also found that the temperature radial profile based on LTE was very close to that of the electrons. The calculations have shown that this method is particularly useful for studying spraying–type plasma jets characterized by electron temperatures in the range 9000–14 000?K.

L. Prevosto; H. Kelly; B. R. Mancinelli

2012-01-01T23:59:59.000Z

182

Influence of base pressure and atmospheric contaminants on a-Si:H solar cell properties  

SciTech Connect (OSTI)

The influence of atmospheric contaminants oxygen and nitrogen on the performance of thin-film hydrogenated amorphous silicon (a-Si:H) solar cells grown by plasma-enhanced chemical vapor deposition at 13.56 MHz was systematically investigated. The question is addressed as to what degree of high base pressures (up to 10{sup -4} Torr) are compatible with the preparation of good quality amorphous silicon based solar cells. The data show that for the intrinsic a-Si:H absorber layer exists critical oxygen and nitrogen contamination levels (about 2x10{sup 19} atoms/cm{sup 3} and 4x10{sup 18} atoms/cm{sup 3}, respectively). These levels define the minimum impurity concentration that causes a deterioration in solar cell performance. This critical concentration is found to depend little on the applied deposition regime. By enhancing, for example, the flow of process gases, a higher base pressure (and leak rate) can be tolerated before reaching the critical contamination level. The electrical properties of the corresponding films show that increasing oxygen and nitrogen contamination results in an increase in dark conductivity and photoconductivity, while activation energy and photosensitivity are decreased. These effects are attributed to nitrogen and oxygen induced donor states, which cause a shift of the Fermi level toward the conduction band and presumably deteriorate the built-in electric field in the solar cells. Higher doping efficiencies are observed for nitrogen compared to oxygen. Alloying effects (formation of SiO{sub x}) are observed for oxygen contaminations above 10{sup 20} atoms/cm{sup 3}, leading to an increase in the band gap.

Woerdenweber, J.; Schmitz, R.; Mueck, A.; Zastrow, U.; Niessen, L.; Gordijn, A.; Carius, R.; Beyer, W.; Rau, U. [IEF 5 Photovoltaik, Forschungszentrum Juelich GmbH, D-52425 Juelich (Germany); Merdzhanova, T.; Stiebig, H. [IEF 5 Photovoltaik, Forschungszentrum Juelich GmbH, D-52425 Juelich (Germany); Malibu GmbH and Co. KG, Boettcherstr. 7, D-33609 Bielefeld (Germany)

2008-11-01T23:59:59.000Z

183

Application of a Microwave-Induced Helium Plasma Detector at Atmospheric Pressure for Gas Chromatographic Capillary Columns  

Science Journals Connector (OSTI)

......to initiate the plasma by directing a...end. After the plasma was initiated...PGM-10X2 2450 MHz microwave power...emitted from the plasma was focused through...chromatograph and the peak area was recorded...evaluate the MPD at atmospheric pressure for capillary...rate, but in large concentration......

Stanley P. Wasik; Frederick P. Schwarz

1980-12-01T23:59:59.000Z

184

PHYSICAL REVIEW E 88, 013107 (2013) Spectroscopic study of plasma evolution in runaway nanosecond atmospheric-pressure  

E-Print Network [OSTI]

PHYSICAL REVIEW E 88, 013107 (2013) Spectroscopic study of plasma evolution in runaway nanosecond atmospheric-pressure He discharges S. Yatom,1 E. Stambulchik,2 V. Vekselman,1 and Ya. E. Krasik1 1 Department-resolved visible-emission spectroscopy measurements are applied to study plasma parameters in nanosecond electrical

185

Decomposition of fluorohydrocarbons in atmospheric-pressure flowing air using coaxial-line-based microwave torch plasma  

Science Journals Connector (OSTI)

Results of the investigation of decomposition of fluorohydrocarbons C2H2F4 (HFC-134a) and CHClF2 (CFC-22) in atmospheric-pressure flowing air using a coaxial-line-based microwave torch plasma are presented. Conce...

M. Jasi?ski; P. Szczucki; M. Dors; J. Mizeraczyk…

2000-03-01T23:59:59.000Z

186

Deposition of Plasma Polymer Films by an Atmospheric Pressure Glow Discharge  

Science Journals Connector (OSTI)

Plasma assisted chemical vapor deposition is a proven ... . The application of non-thermal low pressure plasmas containing organic compounds for thin film deposition by plasma polymerization is well known1.... Th...

Rüdiger Foest; Florian Sigeneger; Martin Schmidt

2001-01-01T23:59:59.000Z

187

Atmospheric pressure chemical vapor deposition of TiN from tetrakis(dimethylamido)titanium and ammonia  

E-Print Network [OSTI]

pressure chemical vapor deposition. Experiments were conducted in a belt furnace; static experiments, in particular, is used for tool coating, solar-control films, and micro- electronic applications. Optically

188

The effects of non-thermal atmospheric pressure plasma jet on attachment of osteoblast  

Science Journals Connector (OSTI)

Despite the high success rate of dental implant surgery, the failures are still being reported and investigation have been undergone to improve attachment of osteoblast on the surface of implant material. With increasing interest in non-thermal atmospheric pressure plasma jet (NTAPPJ), the effects of it on the cellular mechanisms have been previously reported. Hence in this experiment, effects of NTAPPJ on osteoblast for improved attachment and possible application in dental implant surgery were investigated. Mouse osteoblast cells of MC3T3-E1 were first directly treated with NTAPPJ with air for various durations. Also to investigate the effects by culture media, culture media were separately treated with NTAPPJ for the same durations. Cell attachments were then assessed following 4 and 24 h of cell culture using Water Soluble Tetrazolium salt (WST) assay and confirmed by automated cell counter and examining under confocal laser microscope. The results showed that there was significantly improved osteoblast attachment with relatively short duration of NTAPPJ treatment. Also results indicated that NTAPPJ possibly improved osteoblast attachment through interactions with proteins in culture media that in turn interacted with cells. Hence the application of NTAPPJ on osteoblast improves cellular attachment and would be useful tool for dental implant surgery.

Jae-Sung Kwon; Yong Hee Kim; Eun Ha Choi; Kyoung-Nam Kim

2013-01-01T23:59:59.000Z

189

Potential cellular targets and antibacterial efficacy of atmospheric pressure non-thermal plasma  

Science Journals Connector (OSTI)

Abstract Atmospheric pressure non-thermal plasma (APNTP) has been gaining increasing interest as a new alternative antibacterial approach. Although this approach has demonstrated promising antibacterial activity, its exact mechanism of action remains unclear. Mechanistic elucidation of the antimicrobial activity will facilitate development and rational optimisation of this approach for potential medical applications. In this study, the antibacterial efficacy of an in-house-built APNTP jet was evaluated alongside an investigation of the interactions between APNTP and major cellular components in order to identify the potential cellular targets involved in plasma-mediated bacterial destruction mechanisms. The investigated plasma jet exhibited excellent, rapid antibacterial activity against a selected panel of clinically significant bacterial species including Bacillus cereus, meticillin-resistant Staphylococcus aureus (MRSA), Escherichia coli and Pseudomonas aeruginosa, all of which were completely inactivated within 2 min of plasma exposure. Plasma-mediated damaging effects were observed, to varying degrees, on all of the investigated cellular components including DNA, a model protein enzyme, and lipid membrane integrity and permeability. The antibacterial efficacy of APNTP appears to involve a multiple-target mechanism, which potentially reduces the likelihood of emergence of microbial resistance towards this promising antimicrobial approach. However, cellular membrane damage and resulting permeability perturbation was found to be the most likely rate-determining step in this mechanism.

Mahmoud Y. Alkawareek; Sean P. Gorman; William G. Graham; Brendan F. Gilmore

2014-01-01T23:59:59.000Z

190

High-rate HMDSO-based coatings in open air using atmospheric-pressure plasma jet  

Science Journals Connector (OSTI)

This work deals with the high-rate and dust-free formation of carbon-containing silicon oxide (SiOC) coatings in open air without substrate heating using an atmospheric-pressure (AP) plasma jet. The AP plasma was excited by a 13.56-MHz radio frequency (RF) power. Hexamethyldisiloxane and oxygen (O2) were used as the source gases. By optimizing the O2 flow rate and RF power, SiOC films were readily fabricated at deposition rates higher than 100 nm/s without suffering from particulate contaminations of the film surface. Additionally, an inorganic SiO2-like film exhibiting O/Si atomic ratio of approximately 2 was obtained at a deposition rate of ~ 13 nm/s, the value of which is still greater than those obtained in other AP plasma sources. Further systematic studies are needed to see if good-quality inorganic SiO2-like films can be obtained with higher rates.

H. Kakiuchi; K. Higashida; T. Shibata; H. Ohmi; T. Yamada; K. Yasutake

2012-01-01T23:59:59.000Z

191

Influence of oxygen in atmospheric-pressure argon plasma jet on sterilization of Bacillus atrophaeous spores  

Science Journals Connector (OSTI)

A nonequilibrium Ar ? O 2 plasmadischarge at atmospheric pressure was carried out in a coaxial cylindrical reactor with a stepped electrode configuration powered by a 13.56 MHz rf power supplier. The argon glow discharge with high electron density produces oxygen reactive species in large quantities. Argon plasma jets penetrate deep into ambient air and create a path for oxygen radicals to sterilize microbes. A sterilization experiment with bacterial endospores indicates that an argon-oxygen plasma jet very effectively kills endospores of Bacillus atrophaeus (ATCC 9372) thereby demonstrating its capability to clean surfaces and its usefulness for reinstating contaminated equipment as free from toxic biological warfare agents. The decimal reduction time ( D values) of the Ar ? O 2 plasma jet at an exposure distance of 0.5 – 1.5 cm ranges from 5 to 57 s . An actinometric comparison of the sterilization data shows that atomic oxygen radicals play a significant role in plasma sterilization. When observed under a scanning electron microscope the average size of the spores appears to be greatly reduced due to chemical reactions with the oxygen radicals.

Jin-Pyo Lim; Han S. Uhm; Shou-Zhe Li

2007-01-01T23:59:59.000Z

192

One-step fabrication of tetragonal ZrO2 particles by atmospheric pressure plasma jet  

Science Journals Connector (OSTI)

Abstract A novel atmospheric pressure plasma jet (APPJ) was applied to prepare the tetragonal zirconia particles via a solution of zirconyl (IV) nitrate hydrate (ZrO(NO3)2?xH2O) as the precursor. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The microstructure of zirconia was found to be an assembly of spherical particles with a tetragonal structure. The chemical composition of prepared zirconia particles was analyzed by XPS quantification study with an atomic ratio of O/Zr of 2.03 without nitrate residues. The results based on the one-particle-per-drop mechanism in an APPJ system also showed that the synthesis of tetragonal zirconia particles could be effectively achieved in one-step fabrication without the need for additional stabilizers or annealing process. Meanwhile, APPJ system has a great potential to be a cost-effective and time-saving process for particle production as compared to the wet chemical processes.

Yu-Ming Su; Yu-Lin Kuo; Chun-Ming Lin; Sun-Fen Lee

2014-01-01T23:59:59.000Z

193

Cold atmospheric pressure plasma and decontamination. Can it contribute to preventing hospital-acquired infections?  

Science Journals Connector (OSTI)

Summary Healthcare-associated infections (HCAIs) affect ?4.5 million patients in Europe alone annually. With the ever-increasing number of ‘multi-resistant’ micro-organisms, alternative and more effective methods of environmental decontamination are being sought as an important component of infection prevention and control. One of these is the use of cold atmospheric pressure plasma (CAPP) systems with clinical applications in healthcare facilities. \\{CAPPs\\} have been shown to demonstrate antimicrobial, antifungal and antiviral properties and have been adopted for other uses in clinical medicine over the past decade. \\{CAPPs\\} vary in their physical and chemical nature depending on the plasma-generating mechanism (e.g. plasma jet, dielectric barrier discharge, etc.). CAPP systems produce a ‘cocktail’ of species including positive and negative ions, reactive atoms and molecules (e.g. atomic oxygen, ozone, superoxide and oxides of nitrogen), intense electric fields, and ultraviolet radiation (UV). The effects of these ions have been studied on micro-organisms, skin, blood, and DNA; thus, a range of possible applications of \\{CAPPs\\} has been identified, including surface decontamination, wound healing, biofilm removal, and even cancer therapy. Here we evaluate plasma devices, their applications, mode of action and their potential role specifically in combating \\{HCAIs\\} on clinical surfaces.

N. O'Connor; O. Cahill; S. Daniels; S. Galvin; H. Humphreys

2014-01-01T23:59:59.000Z

194

Evaluation of pathogen inactivation on sliced cheese induced by encapsulated atmospheric pressure dielectric barrier discharge plasma  

Science Journals Connector (OSTI)

Abstract Pathogen inactivation induced by atmospheric pressure dielectric barrier discharge (DBD) (250 W, 15 kHz, air discharge) produced in a rectangular plastic container and the effect of post-treatment storage time on inactivation were evaluated using agar plates and cheese slices. When agar plates were treated with plasma, populations of Escherichia coli, Salmonella Typhimurium, and Listeria monocytogenes showed 3.57, 6.69, and 6.53 decimal reductions at 60 s, 45 s, and 7 min, respectively. When the pathogens tested were inoculated on cheese slices, 2.67, 3.10, and 1.65 decimal reductions were achieved at the same respective treatment times. The post-treatment storage duration following plasma treatment potently affected further reduction in pathogen populations. Therefore, the newly developed encapsulated DBD-plasma system for use in a container can be applied to improve the safety of sliced cheese, and increasing post-treatment storage time can greatly enhance the system's pathogen-inactivation efficiency.

Hae In Yong; Hyun-Joo Kim; Sanghoo Park; Amali U. Alahakoon; Kijung Kim; Wonho Choe; Cheorun Jo

2015-01-01T23:59:59.000Z

195

Control of radio-frequency atmospheric pressure argon plasma characteristics by helium gas mixing  

SciTech Connect (OSTI)

The control of plasma characteristics is one of the important issues in many atmospheric pressure plasma applications. In order to accomplish this control, a feasibility study was performed by investigating the role of helium gas in an argon glow plasma that were produced in ambient air by 13.56 MHz radio-frequency power. Optical emission spectroscopy was used to measure rotational temperature and emission spectra acquired between 300 and 840 nm. Based on electrical and optical measurements, parameters such as gas temperature, breakdown voltage, power coupling efficiency, spatial uniformity of rotational temperature, and the sum of the emission intensity were controlled by varying the argon and helium gas mixing ratio. The addition of helium gas (from 0 to 10 lpm) to the argon flow (of 10 lpm) lowered the breakdown voltage (from 430 to 300 V{sub pk}) and the rotational temperature (from 465 to 360 K). However, an excessive addition of helium resulted in a reduction of the spatial uniformity and efficiency of power coupling. When the ratio of helium to argon flow was between 0.3 and 0.5, a high spatial uniformity with a relatively low gas temperature and breakdown voltage was achieved. This suggests that mixing of the supply gas is a useful way of controlling the plasma characteristics that may be utilized for applications with specific required discharge conditions.

Moon, Se Youn; Han, Jewoo; Choe, W. [Department of Physics, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701 (Korea, Republic of)

2006-01-15T23:59:59.000Z

196

Influence of oxygen in atmospheric-pressure argon plasma jet on sterilization of Bacillus atrophaeous spores  

SciTech Connect (OSTI)

A nonequilibrium Ar/O{sub 2} plasma discharge at atmospheric pressure was carried out in a coaxial cylindrical reactor with a stepped electrode configuration powered by a 13.56 MHz rf power supplier. The argon glow discharge with high electron density produces oxygen reactive species in large quantities. Argon plasma jets penetrate deep into ambient air and create a path for oxygen radicals to sterilize microbes. A sterilization experiment with bacterial endospores indicates that an argon-oxygen plasma jet very effectively kills endospores of Bacillus atrophaeus (ATCC 9372), thereby demonstrating its capability to clean surfaces and its usefulness for reinstating contaminated equipment as free from toxic biological warfare agents. The decimal reduction time (D values) of the Ar/O{sub 2} plasma jet at an exposure distance of 0.5-1.5 cm ranges from 5 to 57 s. An actinometric comparison of the sterilization data shows that atomic oxygen radicals play a significant role in plasma sterilization. When observed under a scanning electron microscope, the average size of the spores appears to be greatly reduced due to chemical reactions with the oxygen radicals.

Lim, Jin-Pyo; Uhm, Han S.; Li, Shou-Zhe [Department of Molecular Science and Technology, Ajou University, San 5 Wonchon-Dong, Youngtong-Gu, Suwon 443-749 (Korea, Republic of); State Key Laboratory of Materials Modification by Laser, Ion and Electron Beams Department of Physics, Dalian University of Technology, Dalian 116024 (China)

2007-09-15T23:59:59.000Z

197

Silicon nanoparticle synthesis by short-period thermal anneals at atmospheric pressure in argon  

SciTech Connect (OSTI)

Silicon nanoparticles have been studied for a wide variety of applications including nanoelectronic, photovoltaic, and optoelectronic devices. In this work, silicon nanoparticles were synthesized by short-period annealing of silicon-on-insulator substrates to temperatures ranging between 600 and 900 deg. C in argon gas at atmospheric pressure. Two different top silicon layers were deposited by ion-beam sputtering onto oxidized substrates. The thinner 6 nm top layer samples were annealed to temperatures for 30 s periods while thicker 15 nm top layer samples were annealed for 60 s periods. For both sets of samples, nanoparticles were observed to form at all the anneal temperatures through imaging by AFM. One long-period UHV anneal study, with 30-min anneal times, observed nanoparticle formation at temperatures similar to the current work while another similar long-period UHV anneal reported nanoparticle formation only above well-defined formation temperatures that depended upon the starting top layer thickness. In the current work, the average nanoparticle radius was found to increase both with the final anneal temperature and anneal period. For the highest anneal temperatures of the 6 nm top layer samples, a changing surface topography indicated that the thinner Si source layer was becoming depleted and the nanoparticle formation process was nearing completion. No such changes were observed for the thicker 15 nm samples at the same temperatures.

Spencer, Gregory; Anyamesem-Mensah, Benedict; Galloway, Heather C.; Bandyopadhyay, Anup; Frasier, Daniel [Department of Physics, Texas State University-San Marcos, San Marcos, Texas 78666 (United States); Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76207 (United States); Department of Physics, Texas State University-San Marcos, San Marcos, Texas 78666 (United States)

2011-09-15T23:59:59.000Z

198

Step-coverage simulation for tetraethoxysilane and ozone atmospheric pressure chemical vapor deposition  

SciTech Connect (OSTI)

A simulation model for atmospheric pressure (AP) CVD has bee developed using one-dimensional diffusion and mass conservation equations. The model was applied to trench step-coverage of the tetraethoxysilane (TEOS) and O[sub 3] CVD, in which it was not necessary to consider lateral diffusion because of narrow (and deep) trenches. For nondoped silicate glass (NSG), the step-coverage of a 4.5 aspect ratio trench showed a good fit if a sticking probability of 0.0039 was assumed for the 0.6% ozone (in oxygen) deposition and of 0.0026 for the 6% ozone deposition (both 400 C). The reaction rate constant was compared with the diffusion mass-transfer coefficient, and the reaction proved to be limited by diffusion of the reactant, TEOS, which directly participated in the CVD reaction. For the 2 m/o phosphosilicate glass (PSG) step-coverage, which had a slight overhang, the model matched the obtained results well only when an active growth species with a high sticking probability of 1.0 was added to the growth species of nondoped oxide. This analytical simulation method satisfactorily explains the experimental data.

Fujino, K. (Semiconductor Process Lab., Toyko (Japan)); Egashira, Y.; Shimogaki, Y.; Komiyama, H. (Univ. of Tokyo, (Japan). Dept. of Chemical Engineering)

1993-08-01T23:59:59.000Z

199

On-line coating of glass with tin oxide by atmospheric pressure chemical vapor deposition.  

SciTech Connect (OSTI)

Atmospheric pressure chemical vapor deposition (APCVD) of tin oxide is a very important manufacturing technique used in the production of low-emissivity glass. It is also the primary method used to provide wear-resistant coatings on glass containers. The complexity of these systems, which involve chemical reactions in both the gas phase and on the deposition surface, as well as complex fluid dynamics, makes process optimization and design of new coating reactors a very difficult task. In 2001 the U.S. Dept. of Energy Industrial Technologies Program Glass Industry of the Future Team funded a project to address the need for more accurate data concerning the tin oxide APCVD process. This report presents a case study of on-line APCVD using organometallic precursors, which are the primary reactants used in industrial coating processes. Research staff at Sandia National Laboratories in Livermore, CA, and the PPG Industries Glass Technology Center in Pittsburgh, PA collaborated to produce this work. In this report, we describe a detailed investigation of the factors controlling the growth of tin oxide films. The report begins with a discussion of the basic elements of the deposition chemistry, including gas-phase thermochemistry of tin species and mechanisms of chemical reactions involved in the decomposition of tin precursors. These results provide the basis for experimental investigations in which tin oxide growth rates were measured as a function of all major process variables. The experiments focused on growth from monobutyltintrichloride (MBTC) since this is one of the two primary precursors used industrially. There are almost no reliable growth-rate data available for this precursor. Robust models describing the growth rate as a function of these variables are derived from modeling of these data. Finally, the results are used to conduct computational fluid dynamic simulations of both pilot- and full-scale coating reactors. As a result, general conclusions are reached concerning the factors affecting the growth rate in on-line APCVD reactors. In addition, a substantial body of data was generated that can be used to model many different industrial tin oxide coating processes. These data include the most extensive compilation of thermochemistry for gas-phase tin-containing species as well as kinetic expressions describing tin oxide growth rates over a wide range of temperatures, pressures, and reactant concentrations.

Allendorf, Mark D.; Sopko, J.F. (PPF Industries, Pittsburgh, PA); Houf, William G.; Chae, Yong Kee; McDaniel, Anthony H.; Li, M. (PPF Industries, Pittsburgh, PA); McCamy, J.W. (PPF Industries, Pittsburgh, PA)

2006-11-01T23:59:59.000Z

200

Simple method for preparing hydrogenated amorphous silicon films by chemical vapor deposition at atmospheric pressure  

SciTech Connect (OSTI)

An inexpensive one-step method is presented for fabricating hydrogenated amorphous silicon (a-Si:H) films with good photovoltaic properties using chemical vapor deposition (CVD) from a mixture of silane, disilane, trisilane, and higher polysilanes in hydrogen at one atmosphere total pressure. The gas mixture is generated by the action of dilute acid on magnesium silicide and used immediately in the CVD process. Thus, elaborate techniques for handling, transporting or storing the pyrophoric polysilanes are avoided. In addition, the method requires no expensive vacuum or electrical equipment. The conditions necessary for high (approx. =10%) hydrogen incorporation and very high deposition rates (50-100 A/sec) are explained. Experimental parameters are explained and properties as a function of these parameters are shown. The measurements include hydrogen content, optical, electrical and photovoltaic properties of the a-Si:H films. A chemical kinetic model is presented for this and other silane and polysilane CVD systems between about 400 and 600/sup 0/C. Both homogeneous and heterogeneous reactions are considered. The model is derived from homogeneous gas-phase silane and polysilane chemistry and predicts, in agreement with our experiments, that the homogeneous gas-phase chemistry determines the a-Si:H film growth rate under a variety of conditions. The model is sufficiently predictive to be useful in determining appropriate experimental conditions. Stable solar cells are proposed for a-Si:H and fluorine doped tin oxide which can be produced by CVD at very high deposition rates. The unstable a-Si:H/tin oxide interface is eliminated by a very thin layer of titanium nitride and oxide between the a-Si:H and tin oxide.

Ellis, F.B. Jr.

1983-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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

Micro-structured electrode arrays:: high-frequency discharges at atmospheric pressure—characterization and new applications  

Science Journals Connector (OSTI)

Micro-structured electrode (MSE) arrays allow to generate large-area uniform glow discharges over a wide pressure range up to atmospheric pressure. The electrode dimensions in the ?m-range realized by means of modern micro-machining and galvanic techniques are small enough to generate sufficiently high electric field strengths to ignite gas discharges applying only moderate radio frequency (RF, 13.56 MHz) voltages (80–390 V in Ne, He, Ar and N2). The non-thermal plasma system is characterized by a special probe measuring the electric parameters. The MSE-driven plasmas show a different behavior from conventional discharge plasmas depending on the pressure and the type of gas. With the MSE arrays as plasma sources, several applications were developed and successfully tested: Plasma chemistry (decomposition of waste gases like CF4) and thin film deposition (e.g. SiO2 layers on various substrates). A new atmospheric pressure application realized in our lab is the sterilization of food packaging materials.

Lutz Baars-Hibbe; Christian Schrader; Philipp Sichler; Thorben Cordes; Karl-Heinz Gericke; Stephanus Büttgenbach; Siegfried Draeger

2004-01-01T23:59:59.000Z

202

Passive landfill gas emission – Influence of atmospheric pressure and implications for the operation of methane-oxidising biofilters  

Science Journals Connector (OSTI)

A passively vented landfill site in Northern Germany was monitored for gas emission dynamics through high resolution measurements of landfill gas pressure, flow rate and composition as well as atmospheric pressure and temperature. Landfill gas emission could be directly related to atmospheric pressure changes on all scales as induced by the autooscillation of air, diurnal variations and the passage of pressure highs and lows. Gas flux reversed every 20 h on average, with 50% of emission phases lasting only 10 h or less. During gas emission phases, methane loads fed to a connected methane oxidising biofiltration unit varied between near zero and 247 g CH4 h?1 m?3 filter material. Emission dynamics not only influenced the amount of methane fed to the biofilter but also the establishment of gas composition profiles within the biofilter, thus being of high relevance for biofilter operation. The duration of the gas emission phase emerged as most significant variable for the distribution of landfill gas components within the biofilter.

Julia Gebert; Alexander Groengroeft

2006-01-01T23:59:59.000Z

203

Plasma treatment of carbon fibres and glass-fibre-reinforced polyesters at atmospheric pressure for adhesion improvement  

Science Journals Connector (OSTI)

Atmospheric pressure plasma treatment is useful for adhesion improvement, because cleaning, roughening and addition of polar functional groups can be expected at the surfaces. Its possible applications in the wind energy industry include plasma treatment of fibres and fibre-reinforced polymer composites before assembling them to build wind turbine blades. In the present work, unsized carbon fibres are continuously treated using a dielectric barrier discharge plasma in helium at atmospheric pressure, and carbon fibre reinforced epoxy composite plates are manufactured for the mechanical test. The plasma treatment improved fracture toughness, indicating that adhesion between the fibres and the epoxy was enhanced by the treatment. In addition, glass-fibre-reinforced polyester plates are treated using a gliding arc and an ultrasound enhanced dielectric barrier discharge, improving the wettability and/or the adhesive strength with a vinylester resin.

Yukihiro Kusano; Tom L. Andersen; Helmuth L. Toftegaard; Frank Leipold; Alexander Bardenshtein; Niels Krebs

2014-01-01T23:59:59.000Z

204

Nonequilibrium atmospheric pressure plasma jet using a combination of 50?kHz/2?MHz dual-frequency power sources  

Science Journals Connector (OSTI)

An atmospheric pressure plasma jet is generated by dual sinusoidal wave (50?kHz and 2?MHz). The dual-frequency plasma jet exhibits the advantages of both low frequency and radio frequency plasmas namely the long plasma plume and the high electron density. The radio frequency ignition voltage can be reduced significantly by using dual-frequency excitation compared to the conventional radio frequency without the aid of the low frequency excitation source. A larger operating range of ? mode discharge can be obtained using dual-frequency excitation which is important to obtain homogeneous and low-temperature plasma. A larger controllable range of the gas temperature of atmospheric pressure plasma could also be obtained using dual-frequency excitation.

Yong-Jie Zhou; Qiang-Hua Yuan; Fei Li; Xiao-Min Wang; Gui-Qin Yin; Chen-Zhong Dong

2013-01-01T23:59:59.000Z

205

A passive measurement of dissociated atom densities in atmospheric pressure air discharge plasmas using vacuum ultraviolet self-absorption spectroscopy  

SciTech Connect (OSTI)

We demonstrate a method for determining the dissociation degree of atmospheric pressure air discharges by measuring the self-absorption characteristics of vacuum ultraviolet radiation from O and N atoms in the plasma. The atom densities are determined by modeling the amount of radiation trapping present in the discharge, without the use of typical optical absorption diagnostic techniques which require external sources of probing radiation into the experiment. For an 8.0?mm spark discharge between needle electrodes at atmospheric pressure, typical peak O atom densities of 8.5?×?10{sup 17}?cm{sup ?3} and peak N atom densities of 9.9?×?10{sup 17}?cm{sup ?3} are observed within the first ?1.0?mm of plasma near the anode tip by analyzing the OI and NI transitions in the 130.0–132.0?nm band of the vacuum ultraviolet spectrum.

Laity, George [Center for Pulsed Power and Power Electronics, Department of Electrical and Computer Engineering and Department of Physics, Texas Tech University, Lubbock, Texas 79409 (United States); Applied Science and Technology Maturation Department, Sandia National Laboratories, Albuquerque, New Mexico 87123 (United States); Fierro, Andrew; Dickens, James; Neuber, Andreas [Center for Pulsed Power and Power Electronics, Department of Electrical and Computer Engineering and Department of Physics, Texas Tech University, Lubbock, Texas 79409 (United States); Frank, Klaus [Erlangen Centre for Astroparticle Physics, Department of Physics, Friedrich–Alexander University at Erlangen-Nürnberg, 91058 Erlangen (Germany)

2014-03-28T23:59:59.000Z

206

Flammability Characteristics of Hydrogen and Its Mixtures with Light Hydrocarbons at Atmospheric and Sub-atmospheric Pressures  

E-Print Network [OSTI]

of hydrogen and each hydrocarbon were determined experimentally at room temperature (20ºC) and initial pressures ranging from 1.0 atm to 0.1 atm. The experiments were conducted in a closed cylindrical stainless steel vessel with upward flame propagation...

Le, Thuy Minh Hai

2013-07-13T23:59:59.000Z

207

Nanosecond discharge in air at atmospheric pressure as an x-ray source with high pulse repetition rates  

SciTech Connect (OSTI)

The properties of x-ray radiation and runaway electrons produced using a nanosecond volume discharge are examined. X-ray radiation at a pulse repetition rate of 3 kHz was obtained time in a gas diode filled with air at atmospheric pressure. The current pulse width (FWHM) for runaway electrons generated in the gas diode was {approx}100 ps. A prepulse was observed on an oscilloscope trace of the main runaway electron beam current.

Tarasenko, Victor F. [Institute of High Current Electronics, Siberian Branch of the Russian Academy of Sciences, Tomsk 634021, pr. Akademicheskii 2/3 (Russian Federation)

2006-02-20T23:59:59.000Z

208

Characterization of Pt/SiO2 Model Catalysts at UHV and Near Atmospheric Pressures  

E-Print Network [OSTI]

catalyst samples, prepared under UHV conditions in a contiguous high pressure reactor cell surface analysis with measurements on a Pt(110) single crystal for direct com- parison. CO desorption measurements and STM measure, turnover frequency (TOF, product molecules produced/site/s) is a standard metric used for comparison

Goodman, Wayne

209

Eradication of marine biofilms by atmospheric pressure non-thermal plasma: A potential approach to control biofouling?  

Science Journals Connector (OSTI)

Abstract Although the antimicrobial activity of atmospheric pressure non-thermal plasmas, including its capacity to eradicate microbial biofilms, has been gaining an ever increasing interest for different medical applications, its potential utilisation in the control of biofouling and biodeterioration has, to date, received no attention. In this study, the ability of atmospheric pressure plasma to eradicate biofilms of four biofouling bacterial species, frequently encountered in marine environments, was investigated. Biofilms were grown on both polystyrene and stainless steel surfaces before being exposed to the plasma source. Viability and biomass of biofilms were evaluated using colony count method and differential Live/Dead fluorescence staining followed by confocal laser scanning microscopy. Rapid and complete eradication of all biofilms under study was achieved after plasma exposures ranging from 60 to 120 s. Confocal microscopy examination showed that plasma treatment has mediated not only cell killing but also varying degrees of physical removal of biofilms. Further investigation and tailored development of atmospheric pressure non-thermal plasma sources for this particular application could provide an additional powerful and effective weapon in the current anti-biofouling armamentarium.

Mahmoud Y. Alkawareek; Sean P. Gorman; William G. Graham; Brendan F. Gilmore

2014-01-01T23:59:59.000Z

210

Numerical and experimental study on laminar burning velocity of syngas produced from biomass gasification in sub-atmospheric pressures  

Science Journals Connector (OSTI)

Abstract The laminar burning velocity of syngas mixtures has been studied by various researches. However, most of these studies have been conducted in atmospheric conditions at sea level. In the present study, the effect of sub atmospheric pressure was evaluated on the laminar burning velocity for a mixture of H2, CO and N2 (20:20:60 vol%) in real sub atmospheric condition. The measurements was conducted in an altitude of 2130 m.a.s.l (0.766 atm) and 21 m.a.s.l (0.994 atm) to evaluate the effect of pressure, the temperature and relative humidity were controlled using an air conditioning unit and was maintained in 295 ± 1 K and 62.6 ± 2.7% respectively. The Flames were generated using contoured slot-type nozzle burner, and an ICCD camera was used to capture chemiluminescence emitted by OH?-CH? radicals present in the flame and thus obtain the flame front and determinate the laminar burning velocity using the angle method. The experimental results were compared with numerical calculations, conducted using the detailed mechanisms of Li et al. and the GRI-Mech 3.0. It was found that the laminar burning velocity increases at lower pressure, for an equivalence ratio of 1.1, the laminar burning velocity increases by almost 23% respect to the sea level conditions.

Andres A. Amell; Hernando A. Yepes; Francisco J. Cadavid

2014-01-01T23:59:59.000Z

211

Laser schlieren deflectometry for temperature analysis of filamentary non-thermal atmospheric pressure plasma  

Science Journals Connector (OSTI)

The heat convection generated by micro filaments of a self-organized non-thermal atmospheric pressure plasma jet in Ar is characterized by employing laser schlieren deflectometry (LSD). It is demonstrated as a proof of principle that the spatial and temporal changes of the refractive indexn in the optical beam path related to the neutral gas temperature of the plasma jet can be monitored and evaluated simultaneously. The refraction of a laser beam in a high gradient field of n(r) with cylindrical symmetry is given for a general real refraction index profile. However the usually applied Abel approach represents an ill-posed problem and in particular for this plasma configuration. A simple analytical model is proposed in order to minimize the statistical error. Based on that the temperature profile specifically the absolute temperature in the filament core the FWHM and the frequencies of the collective filament dynamics are obtained for non-stationary conditions. For a gas temperature of 700 K inside the filament the presented model predicts maximum deflection angles of the laser beam of 0.3 mrad which is in accordance to the experimental results obtained with LSD. Furthermore the experimentally obtained FWHM of the temperature profile produced by the filament at the end of capillary is (1.5 ± 0.2) mm which is about 10 times wider than the visual radius of the filament. The obtained maximum temperature in the effluent is (450 ± 30) K and is in consistence with results of other techniques. The study demonstrates that LSD represents a useful low-cost method for monitoring the spatiotemporal behaviour of microdischarges and allows to uncover their dynamic characteristics e.g. the temperature profile even for challenging diagnostic conditions such as moving thin discharge filaments. The method is not restricted to the miniaturized and self-organizedplasma studied here. Instead it can be readily applied to other configurations that produce measurable gradients of refractive index by local gas heating and opens new diagnostics prospects particularly for microplasmas.

J. Schäfer; R. Foest; S. Reuter; T. Kewitz; J. Šperka; K.-D. Weltmann

2012-01-01T23:59:59.000Z

212

Optical and electrical characterization of pulse-modulated argon atmospheric-pressure inductively coupled microplasma jets  

SciTech Connect (OSTI)

The critical parameters determining the generation of the pulse-modulated argon atmospheric-pressure inductively coupled plasma (AP-ICP) microjet were studied by varying the power, P, pulse-modulation frequency, f, and duty ratio, DR. The temporal changes in the net output power, P{sub net}, monitored between the very high frequency power supply and matching network by an rf sampler, and ArI 4s{sup '}[1/2]{sub 1}{sup O}-4p{sup '}[1/2]{sub 0} emission from the antenna were measured to elucidate the behavior of this plasma. The AP-ICP microjet, which produces high-density (0.9-1.1x10{sup 15} cm{sup -3}) nonequilibrium plasma, consists of an alumina discharge tube with the inner diameter of 0.8 mm. The generation diagram of the pulse-modulated plasma was created by having f as the horizontal axis and DR as the vertical axis while varying P up to 50 W. At f{<=}10 kHz, the plasma was generated at above the linear lines of f and DR, which indicated the existence of the critical power-off period of approximately 80 {mu}s. At f>10 kHz, the pulse-modulated plasma was produced above constant DR and almost independent of f. The time-averaged power, P, which is the product of P and DR, had to be more than 8-10 W to sustain the pulse-modulated plasma. From the measurement of the temporal changes in the net power and ArI emission, the dynamic behavior of the pulse-modulated plasma was revealed as follows. The prebreakdown period was present for {approx}5 {mu}s after the power was turned on. Once the plasma was generated, the impedance was changed and the reflected power gradually decreased. A strong emission peak was observed immediately after the breakdown, followed by the gradual increase up to the steady state. Finally, the intense afterpeak was observed at 0.8 {mu}s after the power was turned off.

Tajima, Satomi; Tsuchiya, Shouichi [Department of Bioengineering, Graduate School of Engineering, University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656 (Japan); Matsumori, Masashi; Nakatsuka, Shigeki [Panasonic Factory Solutions Co., Ltd., 2-7 Matsuba-cho, Kadoma-city, Osaka 571-8502 (Japan); Ichiki, Takanori [Department of Bioengineering, Graduate School of Engineering, University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656 (Japan); Institute of Engineering Innovation, Graduate School of Engineering, University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656 (Japan)

2010-10-15T23:59:59.000Z

213

Single crystal flow reactor for studying reactivities on metal oxide model catalysts at atmospheric pressure to bridge the pressure gap to the adsorption properties determined under UHV conditions  

Science Journals Connector (OSTI)

A flow reactor for the investigation of heterogeneous catalytic reactions on single crystalline metal oxide model catalysts has been designed. It is located in a high pressure cell attached to an UHV analysis cha...

C. Kuhrs; M. Swoboda; W. Weiss

2001-01-01T23:59:59.000Z

214

Novel AC and DC Non-Thermal Plasma Sources for Cold Surface Treatment of Polymer Films and Fabrics at Atmospheric Pressure  

Science Journals Connector (OSTI)

Novel types of non-thermal plasma sources at atmospheric pressure based on multi-pin DC (direct ... ofdischarges mentioned and output energy characteristics of new plasma sources as well as data on after-...

Yuri Akishev; Michail Grushin; Anatoly Napartovich…

2002-09-01T23:59:59.000Z

215

Two-Temperature Two-Dimensional Non Chemical Equilibrium Modeling of Ar–CO2–H2 Induction Thermal Plasmas at Atmospheric Pressure  

Science Journals Connector (OSTI)

Here the authors developed a two-dimensional two-temperature chemical non-equilibrium (2T-NCE) model of Ar–...2–H2 inductively coupled thermal plasmas (ICTP) around atmospheric pressure (760 torr). Assuming 22 di...

Sharif Abdullah Al-Mamun; Yasunori Tanaka…

2010-02-01T23:59:59.000Z

216

Measurement of Reactive Hydroxyl Radical Species Inside the Biosolutions During Non-thermal Atmospheric Pressure Plasma Jet Bombardment onto the Solution  

Science Journals Connector (OSTI)

Non-thermal atmospheric pressure plasma jet could generate various kinds of radicals ... The electron temperature and ion density for this non-thermal plasma jet have been measured to be about...13 cm?3 in this e...

Yong Hee Kim; Young June Hong; Ku Youn Baik…

2014-05-01T23:59:59.000Z

217

Room-Temperature Silicon Nitrides Prepared with Very High Rates (>50 nm/s) in Atmospheric-Pressure Very High-Frequency Plasma  

Science Journals Connector (OSTI)

We have investigated the structure and stability of SiN x ...films deposited with very high rates (>50 nm/s) in atmospheric-pressure (AP) He-based plasma excited by a 150 MHz ver...

Hiroaki Kakiuchi; Hiromasa Ohmi; Kei Nakamura…

2010-10-01T23:59:59.000Z

218

Low-temperature atmospheric pressure argon plasma treatment and hybrid laser-plasma ablation of barite crown and heavy flint glass  

Science Journals Connector (OSTI)

We report on atmospheric pressure argon plasma-based surface treatment and hybrid laser-plasma ablation of barite crown glass N-BaK4 and heavy flint glass SF5. By pure plasma...

Gerhard, Christoph; Roux, Sophie; Brückner, Stephan; Wieneke, Stephan; Viöl, Wolfgang

2012-01-01T23:59:59.000Z

219

Effect of Plasma Deposition Using Low-Power/Non-thermal Atmospheric Pressure Plasma on Promoting Adhesion of Composite Resin to Enamel  

Science Journals Connector (OSTI)

...This study investigated the effect of monomer deposition through a low-power, non-thermal atmospheric pressure plasma (NT-APP) on adhesion of resin ... stereomicroscope and a scanning electron microscope. The

Geum-Jun Han; Jae-Hoon Kim; Sung-No Chung…

2014-07-01T23:59:59.000Z

220

The effect of plasma polymer coating using atmospheric-pressure glow discharge on the shear bond strength of composite resin to ceramic  

Science Journals Connector (OSTI)

If plasma technology can come out of the vacuum chamber and plasma can be extruded through a small pencil- ... we designed a small pencil-type non-thermal atmospheric-pressure glow discharge plasma torch. The pur...

Byeong-Hoon Cho; Geum-Jun Han; Kyu-Hwan Oh; Sung-No Chung…

2011-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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

Low loss hollow optical-waveguide connection from atmospheric pressure to ultra-high vacuum  

SciTech Connect (OSTI)

A technique for optically accessing ultra-high vacuum environments, via a photonic-crystal fiber with a long small hollow core, is described. The small core and the long bore enable a pressure ratio of over 10{sup 8} to be maintained between two environments, while permitting efficient and unimpeded delivery of light, including ultrashort optical pulses. This delivery can be either passive or can encompass nonlinear optical processes such as optical pulse compression, deep UV generation, supercontinuum generation, or other useful phenomena.

Ermolov, A.; Mak, K. F.; Tani, F.; Hölzer, P.; Travers, J. C. [Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1, 91058 Erlangen (Germany)] [Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1, 91058 Erlangen (Germany); Russell, P. St. J. [Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1, 91058 Erlangen (Germany) [Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1, 91058 Erlangen (Germany); Department of Physics, University of Erlangen-Nuremberg, Günther-Scharowsky-Str. 1, 91058 Erlangen (Germany)

2013-12-23T23:59:59.000Z

222

PressurePressure Indiana Coal Characteristics  

E-Print Network [OSTI]

TimeTime PressurePressure · Indiana Coal Characteristics · Indiana Coals for Coke · Coal Indiana Total Consumption Electricity 59,664 Coke 4,716 Industrial 3,493 Major Coal- red power plantsTransportation in Indiana · Coal Slurry Ponds Evaluation · Site Selection for Coal Gasification · Coal-To-Liquids Study, CTL

Fernández-Juricic, Esteban

223

Enhancement of film-forming reactions for microcrystalline Si growth in atmospheric-pressure plasma using porous carbon electrode  

Science Journals Connector (OSTI)

We have investigated the structural and electrical properties of microcrystalline silicon ( ? c -Si : H ) filmsdeposited with high rates ( ? 5 ? nm / s ) at 220 ? ° C in atmospheric-pressure He / H 2 / SiH 4 plasma excited by a 150 MHz very high-frequency (VHF) power. For this purpose Si films are prepared varying the deposition parameters such as H 2 and SiH 4 flow rates ( H 2 and SiH 4 concentrations) and VHF power density using two types of electrode (porous carbon and cylindrical rotary electrodes). In the case of using the porous carbonelectrode a ? c -Si : H film having a crystalline volume fraction of 71.9% is obtained even when hydrogen is not added to the process gas mixture ( H 2 / SiH 4 = 0 ) . In addition the films exhibit considerably low defect densities of ( 3 – 5 ) × 10 16 ? cm – 3 despite the high deposition rates. Such high-rate depositions of good-quality films are realized primarily due to the chemical and physical excitations of the film-growing surface by the atmospheric-pressure plasma while suppressing ion damage and excessive heating of the surface. On the other hand when using the cylindrical rotary electrode the phase transition from amorphous to microcrystalline occurs at around H 2 / SiH 4 = 70 . The enhancement of the film-forming reactions by the porous carbonelectrode are discussed from the viewpoint of the gas residence time in the plasma.

Hiroaki Kakiuchi; Hiromasa Ohmi; Ryohei Inudzuka; Kentaro Ouchi; Kiyoshi Yasutake

2008-01-01T23:59:59.000Z

224

High-Pressure Model Catalyst System | EMSL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of one atmosphere or below in a reactor situated just below an ultra-high vacuum (UHV) chamber. In particular, heterogeneous catalytic reactions at realistic pressures over...

225

Constraints on early Mars atmospheric pressure1 inferred from small ancient craters2  

E-Print Network [OSTI]

the history of Mars' atmosphere. Wind erosio . Of particular interest is the climate that allowed rivers to flow early12 in Mars history, which was affected thicker atmospheres: the modern Mars atmosphere can remove >90% of33 the kinetic energy of >240 kg

Kite, Edwin

226

Pressure reducing regulator  

DOE Patents [OSTI]

A pressure reducing regulator that controls its downstream or outlet pressure to a fixed fraction of its upstream or inlet pressure is disclosed. The regulator includes a housing which may be of a titanium alloy, within which is located a seal or gasket at the outlet end which may be made of annealed copper, a rod, and piston, each of which may be made of high density graphite. The regulator is insensitive to temperature by virtue of being without a spring or gas sealed behind a diaphragm, and provides a reference for a system in which it is being used. The rod and piston of the regulator are constructed, for example, to have a 1/20 ratio such that when the downstream pressure is less than 1/20 of the upstream pressure the regulator opens and when the downstream pressure exceeds 1/20 of the upstream pressure the regulator closes. 10 figs.

Whitehead, J.C.; Dilgard, L.W.

1995-10-10T23:59:59.000Z

227

Organic pollutants abatement and biodecontamination of brewery effluents by a non-thermal quenched plasma at atmospheric pressure  

Science Journals Connector (OSTI)

A preliminary study was carried out to investigate possible decontamination of the waste waters from a Cameroonian brewery by using a non-thermal atmospheric plasma. Samples of waste waters collected during periods of intense activity of production were first analysed for organoleptic, physical–chemical and organic parameters, and then exposed to a humid air electric discharge at ambient temperature and pressure. The resultant pollution abatement and germicidal effects are both ascribed to strong oxidising effects of OH and NO radicals formed in the plasma. The BOD removal efficiency of the process with brewery industrial wastewaters under BOD concentration of 385 and 1018 mg l?1 were 74% and 98% respectively. The alkaline wastewaters are rapidly neutralised due to the pH lowering effects of the plasma treatment.

A. Doubla; S. Laminsi; S. Nzali; E. Njoyim; J. Kamsu-Kom; J.-L. Brisset

2007-01-01T23:59:59.000Z

228

Localized DLC etching by a non-thermal atmospheric-pressure helium plasma jet in ambient air  

Science Journals Connector (OSTI)

Abstract Using a versatile atmospheric-pressure helium plasma jet, diamond-like carbon (DLC) films were etched in ambient air. We observed that the DLC films are etched at a nominal rate of around 60 nm/min in the treated area (230 ?m in diameter) during a 20-min exposure. The etching rate increased after the initial 10-min exposure. During this period, the flat DLC surface was structurally modified to produce carbon nanostructures with a density of ~ 2.4 × 1011 cm? 2. With this increase in surface area, the etching rate increased. After 20 min, the DLC film had a circular pattern etched into it down to the substrate where silicon nanostructures were observed with sizes varying from 10 nm to 1 ?m. The initial carbon nanostructure formation is believed to involve selective removal of the sp2-bonded carbon domains. The carbon etching results from the formation of reactive oxygen species in the plasma.

Jun-Seok Oh; Yoshiaki Kakuta; Yuki Yasuoka; Hiroshi Furuta; Akimitsu Hatta

2014-01-01T23:59:59.000Z

229

Low refractive index silicon oxide coatings at room temperature using atmospheric-pressure very high-frequency plasma  

Science Journals Connector (OSTI)

Low refractive index silicon oxide films were deposited using atmospheric-pressure He/SiH4/CO2 plasma excited by a 150-MHz very high-frequency power. Significant increase in deposition rate at room temperature could prevent the formation of dense SiO2 network, decreasing refractive index of the resulting film effectively. As a result, a silicon oxide film with the lowest refractive index, n = 1.24 at 632.8 nm, was obtained with a very high deposition rate of 235 nm/s. The reflectance and transmittance spectra showed that the low refractive index film functioned as a quarter-wave anti-reflection coating of a glass substrate.

H. Kakiuchi; H. Ohmi; Y. Yamaguchi; K. Nakamura; K. Yasutake

2010-01-01T23:59:59.000Z

230

Enhancement of film-forming reactions for microcrystalline Si growth in atmospheric-pressure plasma using porous carbon electrode  

SciTech Connect (OSTI)

We have investigated the structural and electrical properties of microcrystalline silicon ({mu}c-Si:H) films deposited with high rates ({>=}5 nm/s) at 220 deg. C in atmospheric-pressure He/H{sub 2}/SiH{sub 4} plasma excited by a 150 MHz, very high-frequency (VHF) power. For this purpose, Si films are prepared varying the deposition parameters, such as H{sub 2} and SiH{sub 4} flow rates (H{sub 2} and SiH{sub 4} concentrations) and VHF power density, using two types of electrode (porous carbon and cylindrical rotary electrodes). In the case of using the porous carbon electrode, a {mu}c-Si:H film having a crystalline volume fraction of 71.9% is obtained even when hydrogen is not added to the process gas mixture (H{sub 2}/SiH{sub 4}=0). In addition, the films exhibit considerably low defect densities of (3-5)x10{sup 16} cm{sup -3} despite the high deposition rates. Such high-rate depositions of good-quality films are realized primarily due to the chemical and physical excitations of the film-growing surface by the atmospheric-pressure plasma while suppressing ion damage and excessive heating of the surface. On the other hand, when using the cylindrical rotary electrode, the phase transition from amorphous to microcrystalline occurs at around H{sub 2}/SiH{sub 4}=70. The enhancement of the film-forming reactions by the porous carbon electrode are discussed from the viewpoint of the gas residence time in the plasma.

Kakiuchi, Hiroaki; Ohmi, Hiromasa; Inudzuka, Ryohei; Ouchi, Kentaro; Yasutake, Kiyoshi [Department of Precision Science and Technology, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871 (Japan)

2008-09-01T23:59:59.000Z

231

Decomposition Mechanism of Fluorinated Compounds in Water Plasmas Generated Under Atmospheric Pressure  

Science Journals Connector (OSTI)

We developed a DC water plasma torch which with a cathode of...16...]. The hafnium used as cathode material can overcome the erosion problems and achieve a long operating time in oxidation atmospheric. The torch ...

Narengerile; Hironori Saito; Takayuki Watanabe

2010-12-01T23:59:59.000Z

232

High temperature pressure gauge  

DOE Patents [OSTI]

A high temperature pressure gauge comprising a pressure gauge positioned in fluid communication with one end of a conduit which has a diaphragm mounted in its other end. The conduit is filled with a low melting metal alloy above the diaphragm for a portion of its length with a high temperature fluid being positioned in the remaining length of the conduit and in the pressure gauge.

Echtler, J. Paul (Pittsburgh, PA); Scandrol, Roy O. (Library, PA)

1981-01-01T23:59:59.000Z

233

Low-temperature formation of Si O 2 layers using a two-step atmospheric pressure plasma-enhanced deposition-oxidation process  

Science Journals Connector (OSTI)

Silicon oxide ( Si O 2 ) layers were fabricated at low temperatures ( ? 400 ° C ) by combining the deposition of hydrogenated amorphous Si ( a - Si : H ) with its oxidation using atmospheric pressure plasmas excited by a 150 MHz very high-frequency (VHF) power. The surface excitation by the atmospheric pressure VHF plasma was capable of reducing the temperature for the hydrogen effusion from a - Si : H . As a result a porous a - Si : H film containing a large amount of hydrogen could be transformed into a stoichiometric Si O 2 with an approximately 24% increase in oxidation rate compared with the oxidation of Si(001) at a temperature of 400 ° C .

Hiroaki Kakiuchi; Hiromasa Ohmi; Makoto Harada; Heiji Watanabe; Kiyoshi Yasutake

2007-01-01T23:59:59.000Z

234

Stratospheric and mesospheric pressure-temperature profiles from rotational analysis of CO2 lines in atmospheric trace molecule spectroscopy/ATLAS 1 infrared solar occultation spectra  

SciTech Connect (OSTI)

A simple, classical, and expedient method for the retrieval of atmospheric pressure-temperature profiles has been applied to the high-resolution infrared solar absorption spectra obtained with the atmospheric trace molecule spectroscopy (ATMOS) instrument. The basis for this method is a rotational analysis of retrieved apparent abundances from CO2 rovibrational absorption lines, employing existing constituent concentration retrieval software used in the analysis of data returned by ATMOS. Pressure-temperature profiles derived from spectra acquired during the ATLAS 1 space shuttle mission of March-April 1992 are quantitatively evaluated and compared with climatological and meteorological data as a means of assessing the validity of this approach.

Stiller, G.P.; Gunson, M.R.; Lowes, L.L.; Abrams, M.C.; Raper, O.F.; Farmer, C.B.; Zander, R.; Rinsland, C.P. [Kernforschungszentrum Karlsruhe, Karlsruhe (Germany)] [Kernforschungszentrum Karlsruhe, Karlsruhe (Germany); [Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA (United States); [Liege Univ., Liege (Belgium); [NASA, Langley Research Center, Hampton, VA (United States)

1995-02-01T23:59:59.000Z

235

The driving frequency effects on the atmospheric pressure corona jet plasmas from low frequency to radio frequency  

Science Journals Connector (OSTI)

Lately the atmospheric pressure jet type coronaplasma which has been typically driven by dc to low frequency (LF: several tens of kHz) is often generated by using radio frequency of 13.56 MHz. Yet the relationship between the plasma and its driving frequency has seldom been investigated. Hence in this study dependence of the atmospheric pressurecoronaplasmacharacteristics on the driving frequency was explored experimentally from LF to rf (5 kHz–13.56 MHz). The plasmas generated by the driving frequency under 2 MHz were cylindrical shape of several tens of millimeters long while the 13.56 MHz plasma is spherical and a few millimeters long. As the driving frequency was increased the plasma length became shortened. At the lower driving frequencies (below 2 MHz) the plasmas existed as positive streamer and negative glow for each half period of the applied voltage but the discharge was more continuous in time for the 13.56 MHz plasma. It was inferred from the measured I–V curves that the higher driving frequency induced higher discharge currents and the gas temperature was increased as the driving frequency was increased.

Dan Bee Kim; H. Jung; B. Gweon; S. Y. Moon; J. K. Rhee; W. Choe

2011-01-01T23:59:59.000Z

236

High-pressure crystallography  

Science Journals Connector (OSTI)

The history and development of high-pressure crystallography are briefly described and examples of structural transformations in compressed compounds are given. The review is focused on the diamond-anvil cell, celebrating its 50th anniversary this year, the principles of its operation and the impact it has had on high-pressure X-ray diffraction.

Katrusiak, A.

2007-12-21T23:59:59.000Z

237

PRESSURE ACTIVATED SEALANT TECHNOLOGY  

SciTech Connect (OSTI)

The objective of this project is to develop new, efficient, cost effective methods of internally sealing natural gas pipeline leaks through the application of differential pressure activated sealants. In researching the current state of the art for gas pipeline sealing technologies we concluded that if the project was successful, it appeared that pressure activated sealant technology would provide a cost effective alternative to existing pipeline repair technology. From our analysis of current field data for a 13 year period from 1985 to 1997 we were able to identify 205 leaks that were candidates for pressure activated sealant technology, affirming that pressure activated sealant technology is a viable option to traditional external leak repairs. The data collected included types of defects, areas of defects, pipe sizes and materials, incident and operating pressures, ability of pipeline to be pigged and corrosion states. This data, and subsequent analysis, was utilized as a basis for constructing applicable sealant test modeling.

Michael A. Romano

2004-04-01T23:59:59.000Z

238

Effect of a floating electrode on an atmospheric-pressure non-thermal arc discharge  

Science Journals Connector (OSTI)

Characteristics of the atmospheric non-thermal ac arc air plasmas produced by a plasma generator with a floating electrode are investigated. The measurements show that with the help of the surface dielectric barrier discharges between the main electrodes and the floating electrode the ignition voltage of the non-thermal arc discharges can be reduced significantly and an arc discharge mode can be stabilized at high gas flow rates. The measuredtemperatures of the non-thermal arcs are at the level of 2000–3000 K under different operating conditions.

Zhi-Bin Wang; Guo-Xu Chen; Zhe Wang; Nan Ge; He-Ping Li; Cheng-Yu Bao

2011-01-01T23:59:59.000Z

239

Plasma-Assisted Synthesis of TiO2 Nanorods by Gliding Arc Discharge Processing at Atmospheric Pressure for Photocatalytic Applications  

Science Journals Connector (OSTI)

The present study explores a new method of synthesis of TiO2 nano-particles in an aqueous medium from TiCl3 precursor by non-thermal plasma in humid air as feeding gas obtained at atmospheric pressure. The precur...

E. Acayanka; A. Tiya Djowe; S. Laminsi…

2013-08-01T23:59:59.000Z

240

Discharge dynamics of pin-to-plate dielectric barrier discharge at atmospheric pressure  

SciTech Connect (OSTI)

The discharge dynamics of pin-to-plate dielectric barrier discharge was studied in atmospheric helium at 20 kHz. The discharge was predominately ignited in positive half cycle of applied voltage with sinusoidal waveform. The temporal evolution of the discharge was investigated vertically along the discharge gap and radically on the dielectric surface by time resolved imaging. It is found that a discharge column with a diameter of 2 mm was ignited above the pin electrode and expanded toward a plate electrode. On the dielectric surface with space charge accumulation, plasma disk in terms of plasma ring was formed with radius up to 25 mm. The expansion velocity of plasma ring can reach a hypersonic speed of 3.0 km/s. The ionization wave due to electron diffusion is considered to be the mechanism for plasma ring formation and dynamics.

Sun Liqun [College of Science, Donghua University, Shanghai 201620 (China); Huang, Xiaojiang [College of Science, Donghua University, Shanghai 201620 (China); Member of Magnetic Confinement Fusion Research Center, Ministry of Education of the People's Republic of China, Shanghai 201620 (China); Zhang Jie [College of Science, Donghua University, Shanghai 201620 (China); State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620 (China); Zhang Jing; Shi, J. J. [College of Science, Donghua University, Shanghai 201620 (China); State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620 (China); Member of Magnetic Confinement Fusion Research Center, Ministry of Education of the People's Republic of China, Shanghai 201620 (China)

2010-11-15T23:59:59.000Z

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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
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241

Master external pressure charts  

SciTech Connect (OSTI)

This paper presents a method to develop master external pressure charts from which individual external pressure charts for each material specification may be derived. The master external charts can represent a grouping of materials with similar chemical composition, similar stress-strain curves but produced to different strength levels. External pressure charts are used by various Sections of the ASME Boiler and Pressure Vessel and Piping Codes to design various components such as cylinders, sphered, formed heads, tubes, piping, rings and other components, subjected to external pressure or axial compression loads. These charts are pseudo stress-strain curves for groups of materials with similar stress-strain shapes. The traditional approach was originally developed in the 1940`s and is a graphical approach where slopes to the strain curves are drawn graphically from which pseudo-strain levels are calculated. The new method presented in this paper develops mathematical relationships for the material stress-strain curves and the external pressure charts. The method has the ability to calculate stress-strain curves from existing external pressure charts. The relationships are a function of temperature, the modulus of elasticity, yield strength, and two empirical material constants. In this approach, conservative assumptions used to assign materials to lower bound external pressure charts can be removed. This increases the buckling strength capability of many materials in the Code, providing economic benefits while maintaining the margin of safety specified by the Code criteria. The method can also reduce the number of material charts needed in the Code and provides for the capability to extend the existing pressure charts to higher design temperatures. The new method is shown to contain a number of improvements over the traditional approach and is presently under consideration by appropriate ASME Code committees.

Michalopoulos, E. [Hartford Steam Boiler Inspection and Insurance Co., CT (United States). Codes and Standards Dept.

1996-12-01T23:59:59.000Z

242

The effects of non-thermal atmospheric pressure plasma jet on cellular activity at SLA-treated titanium surfaces  

Science Journals Connector (OSTI)

Titanium (Ti) is a primary material used for dental implants, and the sandblasted, large-grit, and acid-etched (SLA) surface treatment is commonly used on titanium to promote early osseointegration. Despite their benefits, SLA-treated Ti surfaces are disadvantaged by their hydrophobic property, and much research has been performed to address this problem. In current study, we hypothesized the effects of a nitrogen-based non-thermal atmospheric pressure plasma jet (NTAPPJ) treatment on SLA-treated Ti would increase hydrophilicity and cellular activity. Samples with and without the NTAPPJ treatment were analyzed using a field emission scanning electron microscope, optical surface roughness system, X-ray photoelectron spectroscope, and water contact angle measuring system. MC3T3-E1 cells (murine osteoblastic cell line) attachments and proliferations were examined by the MTT and BrdU colorimetry assay. Cell immunofluorescent microscopic images were observed by a confocal laser scanning microscope for a morphological analysis. This study found that the nitrogen-based NTAPPJ treatment on SLA-treated Ti significantly increased the hydrophilicity and MC3T3-E1 cell attachments and proliferations. Hence, it was concluded that an additional procedure of nitrogen-based NTAPPJ treatment just prior to implantation of SLA-treated Ti into oral defect sites could improve the success of dental implant surgery.

Eun-Jung Lee; Jae-Sung Kwon; Soo-Hyuk Uhm; Doo-Hoon Song; Yong Hee Kim; Eun Ha Choi; Kyoung-Nam Kim

2013-01-01T23:59:59.000Z

243

Influence of non-thermal atmospheric pressure plasma on cellular structures and processes in human keratinocytes (HaCaT)  

Science Journals Connector (OSTI)

Background The use of non-thermal atmospheric pressure plasma in dermatology to improve the healing of chronic wounds is a promising application. The antimicrobial properties of physical plasma offer on the one hand the killing of bacteria, which are often a problem in chronic wounds. On the other hand, plasma can activate cells which are involved in the wound closure. Objective To guarantee a safe application it is essential to understand basic interactions between physical plasma and human skin cells. Methods In our study, human keratinocytes (HaCaT cells) were directly plasma treated with a dielectric barrier discharge (DBD) plasma source and effects on viability, DNA, cell cycle, intracellular concentration of reactive oxygen species and induction of apoptosis were observed. Results A treatment time-dependent loss of recovered adherent HaCaT cells after 24 h and a linear increase of DNA damage were observed, which was no longer evident 24 h after plasma stimulation, except for long treatment times. An accumulation of HaCaT cells in G2/M phase and a decrease in the G1 phase was caused by DBD plasma. The increasing formation of intracellular ROS is also attributed to plasma treatment. In contrast to other studies we did not find clear evidences for apoptosis in adherent HaCaT cells. A culture medium exchange subsequently after plasma treatment weakened the observed effects. Conclusion DBD plasma treatment resulted in oxidative stress in human keratinocytes which is related to deficient cell performance.

Susanne Blackert; Beate Haertel; Kristian Wende; Thomas von Woedtke; Ulrike Lindequist

2013-01-01T23:59:59.000Z

244

Characteristics of atmospheric-pressure non-thermal N2 and N2/O2 gas mixture plasma jet  

Science Journals Connector (OSTI)

An atmospheric-pressure non-thermal plasma jet driven by high frequency alternating current and operating on N2 and N2/O2 gas mixture is investigated. The plasma jet can reach 55?mm in length at a gas flow rate of 2500?l/h. The gas temperature at a distance of 4?mm from the nozzle is close to room temperature. Optical emission spectroscopy is employed to investigate the important plasma parameters such as the excited species rotational temperature vibrational temperature and excitation temperature under different discharge conditions. The results show that the plasma source operates under non-equilibrium conditions. The absolute irradiance intensity of the vibrational band N2(C-B) in the active region is measured. Taking into account the irradiance intensity of N2(C-B 0-0) and N2(B-X 0-0) as well as measured current the electron density which is determined by considering direct and step-wise electron impact excitation of nitrogen emission reaches a maximum value of 5.6?×?1020/m3.

Dezhi Xiao; Cheng Cheng; Jie Shen; Yan Lan; Hongbing Xie; Xingsheng Shu; Jiangang Li; Paul K. Chu

2014-01-01T23:59:59.000Z

245

Localized etching of an insulator film coated on a copper wire using an atmospheric-pressure microplasma jet  

SciTech Connect (OSTI)

Atmospheric-pressure microplasma jets (AP{mu}PJs) of Ar and Ar/O{sub 2} gases were generated from the tip of a stainless steel surgical needle having outer and inner diameters of 0.4 and 0.2 mm, respectively, with a rf excitation of 13.56 MHz. The steel needle functions both as a powered electrode and a gas nozzle. The operating power is 1.2-6 W and the corresponding peak-to-peak voltage Vp.p. is about 1.5 kV. The AP{mu}PJ was applied to the localized etching of a polyamide-imide insulator film (thickness of 10 {mu}m) of a copper winding wire of 90 {mu}m diameter. The insulator film around the copper wire was completely removed by the irradiated plasma from a certain direction without fusing the wire. The removal time under the Ar AP{mu}PJ irradiation was only 3 s at a rf power of 4 W. Fluorescence microscopy and scanning electron microscope images reveal that good selectivity of the insulator film to the copper wire was achieved. In the case of Ar/O{sub 2} AP{mu}PJ irradiation with an O{sub 2} concentration of 10% or more, the removed copper surface was converted to copper monoxide CuO.

Yoshiki, Hiroyuki [Tsuruoka National College of Technology, Inooka-Sawada 104, Tsuruoka, Yamagata 997-8511 (Japan)

2007-04-15T23:59:59.000Z

246

Preparation of Ti O 2 thin films on the inner surface of a quartz tube using atmospheric-pressure microplasma  

Science Journals Connector (OSTI)

Titanium dioxide ( Ti O 2 ) thin films were prepared on the inner surface of a quartz tube with inner and outer diameters of 1 and 3 mm respectively using plasma-enhanced chemical vapor deposition with titanium tetraisopropoxide and oxygen ( O 2 ) as reactants and helium as the carrier gas at atmospheric pressure. A microplasma was generated inside the tube by rf ( 13.56 MHz ) excitation using externally attached parallel-plate electrodes. The characteristics of the depositedfilms were examined by scanning electron microscopy x-ray photoelectron spectroscopy and x-ray diffraction. A typical as-deposited film had an amorphous structure with a smooth surface and was transparent. With increasing O 2 concentration in the plasma gas phase the depositedfilmsurface was covered with a large number of Ti O 2 nanoparticles. However the depositedfilms were a mixture of Ti O 2 and amorphous carbon and showed rough surface in the absence of O 2 in the source gas. The effects of the O 2 concentration in the plasma gas on the characteristics of the deposited Ti O 2 films are discussed on the basis of the analysis of the gas species generated in the plasma using optical emission spectroscopy.

Hiroyuki Yoshiki; Taku Saito

2008-01-01T23:59:59.000Z

247

Influence of Penning effect on the plasma features in a non-equilibrium atmospheric pressure plasma jet  

SciTech Connect (OSTI)

Non-equilibrium atmospheric pressure plasma jet (APPJ) is a cold plasma source that promises various innovative applications. The influence of Penning effect on the formation, propagation, and other physical properties of the plasma bullets in APPJ remains a debatable topic. By using a 10?cm wide active electrode and a frequency of applied voltage down to 0.5?Hz, the Penning effect caused by preceding discharges can be excluded. It was found that the Penning effect originating in a preceding discharge helps build a conductive channel in the gas flow and provide seed electrons, thus the discharge can be maintained at a low voltage which in turn leads to a smaller propagation speed for the plasma bullet. Photographs from an intensified charge coupled device reveal that the annular structure of the plasma plume for He is irrelevant to the Penning ionization process arising from preceding discharges. By adding NH{sub 3} into Ar to introduce Penning effect, the originally filamentous discharge of Ar can display a rather extensive plasma plume in ambient as He. These results are helpful for the understanding of the behaviors of non-equilibrium APPJs generated under distinct conditions and for the design of plasma jet features, especially the spatial distribution and propagation speed, which are essential for application.

Chang, Zhengshi; Zhang, Guanjun [School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049 (China); Jiang, Nan; Cao, Zexian, E-mail: zxcao@iphy.ac.cn [Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)

2014-03-14T23:59:59.000Z

248

A dominant role of oxygen additive on cold atmospheric-pressure He + O{sub 2} plasmas  

SciTech Connect (OSTI)

We present in this paper how oxygen additive impacts on the cold atmospheric-pressure helium plasmas by means of a one-dimensional fluid model. For the oxygen concentration [O{sub 2}]?>??0.1%, the influence of oxygen on the electron characteristics and the power dissipation becomes important, e.g., the electron density, the electron temperature in sheath, the electron-coupling power, and the sheath width decreasing by 1.6 to 16 folds with a two-log increase in [O{sub 2}] from 0.1% to 10%. Also the discharge mode evolves from the ? mode to the ? mode. The reactive oxygen species are found to peak in the narrow range of [O{sub 2}]?=?0.4%–0.9% in the plasmas, similar to their power-coupling values. This applies to their wall fluxes except for those of O* and O{sub 2}{sup ?}. These two species have very short lifetimes, thus only when generated in boundary layers within several micrometers next to the electrode can contribute to the fluxes. The dominant reactive oxygen species and the corresponding main reactions are schematically presented, and their relations are quantified for selected applications.

Yang, Aijun; Liu, Dingxin, E-mail: liudingxin@gmail.com, E-mail: xhw@mail.xjtu.edu.cn; Rong, Mingzhe; Wang, Xiaohua, E-mail: liudingxin@gmail.com, E-mail: xhw@mail.xjtu.edu.cn [Centre for Plasma Biomedicine, State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049 (China); Kong, Michael G. [Centre for Plasma Biomedicine, State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049 (China); Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, Virginia 23508 (United States); Department of Electrical and Computer Engineering, Old Dominion University, Norfolk, Virginia 23529 (United States)

2014-08-15T23:59:59.000Z

249

A study of production of {alpha}-form plaster from FGD sludge in an aqueous solution at atmospheric pressure  

SciTech Connect (OSTI)

A process for directly converting FGD sludge solid into {alpha}-form plaster in an aqueous solution at atmospheric pressure with simultaneous collection of SO{sub 2} evolved has been studied. The reactant suspension comprises FGD sludge solid in a ratio of solid to liquid from 1:1.25 to 1:10, sulfuric acid from 5% to 30%, alkali earth metal chloride salts no more than 8% which serves as the catalyst for crystallization. Experiments are proceeded in pH values from acidic range to near neutral range in a temperature range from 80 C to the near boiling point of suspension. It has been found that the concentrations of acid in liquid and the reaction temperature are the most sensitive factors to the rate of dehydration of FGD gypsum. Increasing the ratio of solid to liquid is disadvantageous for growth of crystals even though it does not effect obviously on the rate of dehydration of FGD gypsum. Addition of glycerol less than 3% plays a role in stabilizing {alpha}-form calcium sulfate hemihydrate crystals occurring in solution long enough so that crystals grow big. On the other hand, the pH range is the most important to modify crystal habit in presence of succinic acid. The more closed to the neutral range of pH value the liquid is adjusted, the better stability of the crystals appears, the more favorable for producing big squat crystals in high quality the process is believed.

Tong, S. [Wuhan Yejin Univ. of Technology and Science, Wuhan, Hubei (China). Dept.of Chemical Engineering; Kirk, D. [Univ. of Toronto, Ontario (Canada). Dept. of Chemical Engineering

1996-12-31T23:59:59.000Z

250

Thermodynamic and economic analysis of polygeneration system integrating atmospheric pressure coal pyrolysis technology with circulating fluidized bed power plant  

Science Journals Connector (OSTI)

Abstract Lignite-based polygeneration system has been considered as a feasible technology to realize clean and efficient utilization of coal resources. A newly polygeneration system has been proposed, featuring the combination of a 2 × 300 MW circulating fluidized bed (CFB) power plant and atmospheric pressure fluidized bed pyrolyzers. Xiaolongtan lignite is pyrolyzed in pyrolyzers. Pyrolyzed volatiles are further utilized for the co-generation of methanol, oil, and electricity, while char residues are fired in CFB boilers to maintain the full load condition of boilers. Detailed system models were built, and the optimum operation parameters of the polygeneration plant were sought. Technical and economic performances of optimum design of the polygeneration plant were analyzed and compared with those of the conventional CFB power plant based on the evaluation of energy and exergy efficiency, internal rate of return (IRR), and payback period. Results revealed that system efficiency and the IRR of the polygeneration plant are ca. 9% and 14% points higher than those of the power plant, respectively. The study also analyzed the effects of market fluctuations on the economic condition of the polygeneration plant, and found that prices of fuel, material, and products have great impacts on the economic characteristics of the polygeneration plant. Polygeneration plant is more economic than CFB power plant even when prices fluctuate within a wide range. This paper provides a thorough evaluation of the polygeneration plant, and the study indicates that the proposed polygeneration plant has a bright prospect.

Zhihang Guo; Qinhui Wang; Mengxiang Fang; Zhongyang Luo; Kefa Cen

2014-01-01T23:59:59.000Z

251

High pressure counterflow CHF.  

E-Print Network [OSTI]

This is a report of the experimental results of a program in countercurrent flow critical heat flux. These experiments were performed with Freon 113 at 200 psia in order to model a high pressure water system. An internally ...

Walkush, Joseph Patrick

1975-01-01T23:59:59.000Z

252

Nonlinear optomechanical pressure  

E-Print Network [OSTI]

A transparent material exhibits ultra-fast optical nonlinearity and is subject to optical pressure if irradiated by a laser beam. However, the effect of nonlinearity on optical pressure is often overlooked, even if a nonlinear optical pressure may be potentially employed in many applications, as optical manipulation, biophysics, cavity optomechanics, quantum optics, optical tractors, and is relevant in fundamental problems as the Abraham-Minkoswky dilemma, or the Casimir effect. Here we show that an ultra-fast nonlinear polarization gives indeed a contribution to the optical pressure that also is negative in certain spectral ranges; the theoretical analysis is confirmed by first-principles simulations. An order of magnitude estimate shows that the effect can be observable by measuring the deflection of a membrane made by graphene.

Claudio Conti; Robert Boyd

2014-03-08T23:59:59.000Z

253

Pressure Relief Devices for High-Pressure Gaseous Storage Systems...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Pressure Relief Devices for High-Pressure Gaseous Storage Systems: Applicability to Hydrogen Technology A. Kostival, C. Rivkin, W. Buttner, and R. Burgess National Renewable Energy...

254

ARM - Atmospheric Pressure  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

be removed from the source of heat with heavy gloves and the cap refitted to make the seal again. Without paying special attention to the heated can, the lecture should...

255

A study of diurnal pressure and temperature oscillations in the atmosphere between 500 MB and 50 MB  

E-Print Network [OSTI]

A STUDY OF DIURNAL PRESSURE AND 'IEMPERATURE OSCILLATIONS IN TRE ATMOSPMSRE BETWEEN 500 MB AND 50 MB A Thesis By Victor Shelby Whitehead Submitted to the Graduate School of the Agricultural and Mechanical College of Texas in partial... fulfillment of the requirements for the degree of January l960 IlaJor subJect - Meteorology A STUDY OP DIURNAL PRESSURE AND TEMPERATURE OSCILLATIONS IN THE ATII)SPHERE BETWEEN 500 MB AND 50 MB A Thesis By Victor Shelby Whitehead Approved as to style...

Whitehead, Victor Shelby

1960-01-01T23:59:59.000Z

256

Evaluation of bone response to synthetic bone grafting material treated with argon-based atmospheric pressure plasma  

Science Journals Connector (OSTI)

Abstract Bone graft materials are utilized to stimulate healing of bone defects or enhance osseointegration of implants. In order to augment these capabilities, various surface modification techniques, including atmospheric pressure plasma (APP) surface treatment, have been developed. This in vivo study sought to assess the effect of APP surface treatment on degradation and osseointegration of Synthograft™, a beta-tricalcium phosphate (?-TCP) synthetic bone graft. The experimental (APP-treated) grafts were subjected to APP treatment with argon for a period of 60 s. Physicochemical characterization was performed by environmental scanning electron microscopy, surface energy (SE), and x-ray photoelectron spectroscopy analyses both before and after APP treatment. Two APP-treated and two untreated grafts were surgically implanted into four critical-size calvarial defects in each of ten New Zealand white rabbits. The defect samples were explanted after four weeks, underwent histological analysis, and the percentages of bone, soft tissue, and remaining graft material were quantified by image thresholding. Material characterization showed no differences in particle surface morphology and that the APP-treated group presented significantly higher SE along with higher amounts of the base material chemical elements on it surface. Review of defect composition showed that APP treatment did not increase bone formation or reduce the amount of soft tissue filling the defect when compared to untreated material. Histologic cross-sections demonstrated osteoblastic cell lines, osteoid deposition, and neovascularization in both groups. Ultimately, argon-based APP treatment did not enhance the osseointegration or degradation of the ?-TCP graft. Future investigations should evaluate the utility of gases other than argon to enhance osseointegration through APP treatment.

Bryan G. Beutel; Natalie R. Danna; Riddhi Gangolli; Rodrigo Granato; Lakshmiprada Manne; Nick Tovar; Paulo G. Coelho

2014-01-01T23:59:59.000Z

257

Low-temperature formation of SiO{sub 2} layers using a two-step atmospheric pressure plasma-enhanced deposition-oxidation process  

SciTech Connect (OSTI)

Silicon oxide (SiO{sub 2}) layers were fabricated at low temperatures ({<=}400 deg. C) by combining the deposition of hydrogenated amorphous Si (a-Si:H) with its oxidation using atmospheric pressure plasmas excited by a 150 MHz very high-frequency (VHF) power. The surface excitation by the atmospheric pressure VHF plasma was capable of reducing the temperature for the hydrogen effusion from a-Si:H. As a result, a porous a-Si:H film containing a large amount of hydrogen could be transformed into a stoichiometric SiO{sub 2} with an approximately 24% increase in oxidation rate compared with the oxidation of Si(001) at a temperature of 400 deg. C.

Kakiuchi, Hiroaki; Ohmi, Hiromasa; Harada, Makoto; Watanabe, Heiji; Yasutake, Kiyoshi [Department of Precision Science and Technology, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871 (Japan)

2007-10-15T23:59:59.000Z

258

The quenching effect of hydrogen on the nitrogen in metastable state in atmospheric-pressure N{sub 2}-H{sub 2} microwave plasma torch  

SciTech Connect (OSTI)

The atmospheric-pressure microwave N{sub 2}-H{sub 2} plasma torch is generated and diagnosed by optical emission spectroscopy. It is found that a large amount of N atoms and NH radicals are generated in the plasma torch and the emission intensity of N{sub 2}{sup +} first negative band is the strongest over the spectra. The mixture of hydrogen in nitrogen plasma torch causes the morphology of the plasma discharge to change with appearance that the afterglow shrinks greatly and the emission intensity of N{sub 2}{sup +} first negative band decreases with more hydrogen mixed into nitrogen plasma. In atmospheric-pressure microwave-induced plasma torch, the hydrogen imposes a great influence on the characteristics of nitrogen plasma through the quenching effect of the hydrogen on the metastable state of N{sub 2}.

Li, Shou-Zhe, E-mail: lisz@dlut.edu.cn; Zhang, Xin; Chen, Chuan-Jie; Zhang, Jialiang [Key Laboratory of Materials Modification by Laser, Ion, Electron Beams (Dalian University of Technology), Ministry of Education, Dalian 116024 (China); School of Physics and Optoelectronic Technology, Dalian 116024 (China); Wang, Yong-Xing [College of Electrical Engineering, Dalian 116024 (China); Xia, Guang-Qing [School of Aeronautics and Astronautics, Dalian University of Technology, Dalian 116024 (China)

2014-07-15T23:59:59.000Z

259

Abstract Atmospheric CO2 partial pressure (pCO2) was as low as 18 Pa during the Pleistocene and is projected to  

E-Print Network [OSTI]

Abstract Atmospheric CO2 partial pressure (pCO2) was as low as 18 Pa during the Pleistocene and is projected to increase from 36 to 70 Pa CO2 before the end of the 21st century. High pCO2 often increases the growth and repro- duction of C3 annuals, whereas low pCO2 decreases growth and may reduce or prevent

Antonovics, Janis

260

Modeling the barotropic response of the global ocean to atmospheric wind and pressure forcing -comparisons with observations  

E-Print Network [OSTI]

-G. Model outputs are compared to in situ observations with tide gauge data (TG) and bottom pressure gauge data (BPR), and also with T/P altimetric cross over points (noted CO). Intercomparisons were performed/P and Jason altimeters deliver very accurate data sets (within 2 centimeter global error for T/P). How- ever

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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

Saltstone Osmotic Pressure  

SciTech Connect (OSTI)

Recent research into the moisture retention properties of saltstone suggest that osmotic pressure may play a potentially significant role in contaminant transport (Dixon et al., 2009 and Dixon, 2011). The Savannah River Remediation Closure and Disposal Assessments Group requested the Savannah River National Laboratory (SRNL) to conduct a literature search on osmotic potential as it relates to contaminant transport and to develop a conceptual model of saltstone that incorporates osmotic potential. This report presents the findings of the literature review and presents a conceptual model for saltstone that incorporates osmotic potential. The task was requested through Task Technical Request HLW-SSF-TTR-2013-0004. Simulated saltstone typically has very low permeability (Dixon et al. 2008) and pore water that contains a large concentration of dissolved salts (Flach and Smith 2013). Pore water in simulated saltstone has a high salt concentration relative to pore water in concrete and groundwater. This contrast in salt concentration can generate high osmotic pressures if simulated saltstone has the properties of a semipermeable membrane. Estimates of osmotic pressure using results from the analysis of pore water collected from simulated saltstone show that an osmotic pressure up to 2790 psig could be generated within the saltstone. Most semi-permeable materials are non-ideal and have an osmotic efficiency <1 and as a result actual osmotic pressures are less than theoretical pressures. Observations from laboratory tests of simulated saltstone indicate that it may exhibit the behavior of a semi-permeable membrane. After several weeks of back pressure saturation in a flexible wall permeameter (FWP) the membrane containing a simulated saltstone sample appeared to have bubbles underneath it. Upon removal from the FWP the specimen was examined and it was determined that the bubbles were due to liquid that had accumulated between the membrane and the sample. One possible explanation for the accumulation of solution between the membrane and sample is the development of osmotic pressure within the sample. Osmotic pressure will affect fluid flow and contaminant transport and may result in the changes to the internal structure of the semi-permeable material. B?nard et al. 2008 reported swelling of wet cured Portland cement mortars containing salts of NaNO{sub 3}, KNO{sub 3}, Na{sub 3}PO{sub 4}x12H {sub 2}O, and K{sub 3}PO{sub 4} when exposed to a dilute solution. Typically hydraulic head is considered the only driving force for groundwater in groundwater models. If a low permeability material containing a concentrated salt solution is present in the hydrogeologic sequence large osmotic pressures may develop and lead to misinterpretation of groundwater flow and solute transport. The osmotic pressure in the semi-permeable material can significantly impact groundwater flow in the vicinity of the semi-permeable material. One possible outcome is that groundwater will flow into the semi-permeable material resulting in hydrologic containment within the membrane. Additionally, hyperfiltration can occur within semi-permeable materials when water moves through a membrane into the more concentrated solution and dissolved constituents are retained in the lower concentration solution. Groundwater flow and transport equations that incorporate chemical gradients (osmosis) have been developed. These equations are referred to as coupled flow equations. Currently groundwater modeling to assess the performance of saltstone waste forms is conducted using the PORFLOW groundwater flow and transport model. PORFLOW does not include coupled flow from chemico-osmotic gradients and therefore numerical simulation of the effect of coupled flow on contaminant transport in and around saltstone cannot be assessed. Most natural semi-permeable membranes are non-ideal membranes and do not restrict all movement of solutes and as a result theoretical osmotic potential is not realized. Osmotic efficiency is a parameter in the coupled flow equation that accounts for the

Nichols, Ralph L.; Dixon, Kenneth L.

2013-09-23T23:59:59.000Z

262

Ambient Temperature Hydrocarbon Selective Catalytic Reduction of NOx Using Atmospheric Pressure Nonthermal Plasma Activation of a Ag/Al2O3 Catalyst  

Science Journals Connector (OSTI)

Ambient Temperature Hydrocarbon Selective Catalytic Reduction of NOx Using Atmospheric Pressure Nonthermal Plasma Activation of a Ag/Al2O3 Catalyst ... This low temperature activity provides the basis for applying nonthermal plasmas to activate emission control catalysts during cold start conditions, which remains an important issue for mobile and stationary applications. ... (14, 15) Therefore, the combination of heterogeneous catalysis with plasmas has attracted interest due to the combined possible advantages of having a fast and low-temperature reaction from atmospheric nonthermal plasma and high product selectivity from heterogeneous catalysis. ...

Cristina E. Stere; Wameedh Adress; Robbie Burch; Sarayute Chansai; Alexandre Goguet; William G. Graham; Fabio De Rosa; Vincenzo Palma; Christopher Hardacre

2014-01-10T23:59:59.000Z

263

Reference Handbook: Pressure detectors  

SciTech Connect (OSTI)

The purpose of this handbook is to provide Rocky Flats personnel with the information necessary to understand pressure detection. Upon completion of this handbook you should be able to do the following: Define pressure in terms of force and area. Describe the basic operating principles of the U-Tube Manometer. Demonstrate proper techniques for reading Manometers. Describe the basic operating principles of the three types of Bourdon Tubes. Explain the difference between diaphragm. and bellows-type pressure measurement devices. This handbook is designed for use by experienced Rocky Flats operators to reinforce and improve their current knowledge level, and by entry-level operators to ensure that they possess a minimum level of fundamental knowledge. Pressure Detectors is applicable to many job classifications and can be used as a reference for classroom work or for self-study. Although this reference handbook is by no means all-encompassing, you will gain enough information about this subject area to assist you in contributing to the safe operations of Rocky Flats Plant.

Not Available

1990-11-09T23:59:59.000Z

264

Comparison of POLDER Apparent and Corrected Oxygen Pressure to ARM/MMCR Cloud Boundary Pressures  

SciTech Connect (OSTI)

POLDER (POLarization and Directionality of the Earth’s Reflectances) cloud oxygen pressures are compared to cloud boundary pressures obtained from the combination of Lidar and Millimeter Wave Cloud Radar ground measurements located at the Atmospheric Radiation Measurement (ARM) Southern Great Plains (SGP) site. Without ground reflection correction, the apparent pressures are found to be closer to the mean cloud pressure than to the cloud top pressure. Nevertheless, for almost a quarter of our comparison cases the apparent pressure level is found to be below the cloud base level. This problem practically disappears applying a simple correction for the surface reflection effect. The corrected oxygen pressures are then found to be very close (12 hPa on average) to the mean cloud pressure.

Vanbauce, Claudine; Cadet, Bertrand; Marchand, Roger T.

2003-03-06T23:59:59.000Z

265

Non-thermal atmospheric pressure plasma: Screening for gentle process conditions and antibacterial efficiency on perishable fresh produce  

Science Journals Connector (OSTI)

Abstract Fresh fruits and vegetables, destined to be eaten raw or minimally processed only, harbor the risk of conveying pathogenic microorganisms. Factors such as weather conditions, which favor survival or growth of microorganisms, and improper handling during cultivation or in the postharvest chain, can contribute to outbreaks of food-borne illness. Application of chemical sanitizers or physical treatments often shows a limited efficiency or does not meet consumer acceptance. Availability of gentle and effective techniques for disinfection of fresh produce, therefore, is highly desirable. Non-thermal gas plasma (NTP) treatment is a promising novel technique to reduce the microbial load on fresh fruits and vegetables. However, knowledge on practical applicability of NTP for fresh fruits and vegetables is very limited. In this study, chlorophyll fluorescence imaging (CFI) was used to elucidate suitable process parameters for application of an atmospheric pressure plasma-jet (kINPen 09, INP Greifswald, Germany) on corn salad, a perishable leafy green. Keeping a distance of 17 mm to the plasma-jet, corn salad leaves could be treated for up to 60 s at a fixed power (8 W) and 5 L min? 1 of argon mixed with 0.1% oxygen. Surface temperature on leaves did never exceed 35.2 °C. Antibacterial tests were performed on corn salad, cucumber, apple, and tomato and achieved an inactivation of artificially inoculated Escherichia coli DSM 1116 of 4.1 ± 1.2, 4.7 ± 0.4, 4.7 ± 0, and 3.3 ± 0.9 log units, respectively, after 60 s treatment time. Additional tests with a dielectric barrier discharge plasma and indirect plasma treatment within a remote exposure reactor, fed by a microwave induced plasma torch, did not result in equivalent levels of quality retention as observed using the plasma-jet. Industrial relevance Development of gentle non-thermal disinfection methods aims to provide the industry with new tools to actively improve the microbial status of fresh produce beyond the preventive benefits of good hygiene practices and the limited efficacy of post-harvest washing. The presented study shows how cold plasma can be applied to heat-sensitive lettuce leaves without detrimental effects to product quality. The additional microbiological tests offer insights into the antibacterial capacity of cold plasma on different produce surfaces. The results contribute to prompt the development of appropriate large-scale plasma sources to establish a new plasma-based sanitation technique for fresh fruits and vegetables, which should also be implementable into running process lines.

Matthias Baier; Mandy Görgen; Jörg Ehlbeck; Dietrich Knorr; Werner B. Herppich; Oliver Schlüter

2014-01-01T23:59:59.000Z

266

High pressure oxygen furnace  

DOE Patents [OSTI]

A high temperature high pressure oxygen furnace having a hybrid partially externally heated construction is disclosed. A metallic bar fabricated from an alloy having a composition of at least 45% nickel, 15% chrome, and 10% tungsten is utilized, the preferred alloy including 55% nickel, 22% chrome, 14% tungsten, 2% molybdenum, 3% iron (maximum) and 5% cobalt (maximum). The disclosed alloy is fabricated into 11/4 inch bar stock and has a length of about 17 inches. This bar stock is gun drilled for over 16 inches of its length with 0.400 inch aperture to define a closed high temperature, high pressure oxygen chamber. The opposite and closed end of the bar is provided with a small support aperture into which both a support and a thermocouple can be inserted. The closed end of the gun drilled bar is inserted into an oven, preferably heated by standard nickel chrome electrical elements and having a heavily insulated exterior. 5 figs.

Morris, D.E.

1992-07-14T23:59:59.000Z

267

High pressure oxygen furnace  

DOE Patents [OSTI]

A high temperature high pressure oxygen furnace having a hybrid partially externally heated construction is disclosed. A metallic bar fabricated from an alloy having a composition of at least 45% nickel, 15% chrome, and 10% tungsten is utilized (the preferred alloy including 55% nickel, 22% chrome, 14% tungsten, 2% molybdenum, 3% iron (maximum) and 5% cobalt (maximum). The disclosed alloy is fabricated into 11/4 inch bar stock and has a length of about 17 inches. This bar stock is gun drilled for over 16 inches of its length with 0.400 inch aperture to define a closed high temperature, high pressure oxygen chamber. The opposite and closed end of the bar is provided with a small support aperture into which both a support and a thermocouple can be inserted. The closed end of the gun drilled bar is inserted into an oven, preferably heated by standard nickel chrome electrical elements and having a heavily insulated exterior.

Morris, Donald E. (Kensington, CA)

1992-01-01T23:59:59.000Z

268

Applicability of Henry's law to hydrogen, helium, and nitrogen solubilities in water and olive oil at 37 °C and pressures up to 300 atmospheres  

Science Journals Connector (OSTI)

The solubilities of pure hydrogen, helium, and nitrogen in water and olive oil were measured at 37 °C at gas-saturation pressures from 25 to 300 atmospheres. Rigorous thermodynamic criteria were used to assess the applicability of Henry's law to the pressure dependence of the gas solubility in each system. The solubilities of the three gases in water and helium in olive oil followed Henry's law as given by the Krichevsky-Kasarnovsky equation. In contrast, hydrogen and nitrogen in olive oil each attained concentrations high enough to cause significant concentration-dependent variations of the dissolved gas activity coefficient and/or partial molal volume. The consequent deviations from Henry's law were greatest in the nitrogen-oil system, where mole fraction nitrogen solubilities calculated from the Krichevsky-Kasarnovsky equation exceeded measured values by 8, 14, and 23% at 50, 100, and 250 atm, respectively. Incorporation of results into the critical volume model of nitrogen anesthesia, using olive oil as a model of the physiological anesthetic site and literature data for the anesthetic potency of nitrogen in mice breathing high-pressure He-N2-O2 atmospheres, shows that nonideal solution behavior may become important for gases dissolved in physiological hydrophobic regions at biologically active concentrations, even if dissolved gas binding to proteins or other macromolecules is not involved.

Wayne A. Gerth

1985-01-01T23:59:59.000Z

269

High pressure storage vessel  

DOE Patents [OSTI]

Disclosed herein is a composite pressure vessel with a liner having a polar boss and a blind boss a shell is formed around the liner via one or more filament wrappings continuously disposed around at least a substantial portion of the liner assembly combined the liner and filament wrapping have a support profile. To reduce susceptible to rupture a locally disposed filament fiber is added.

Liu, Qiang

2013-08-27T23:59:59.000Z

270

Pressure-flow reducer for aerosol focusing devices  

DOE Patents [OSTI]

A pressure-flow reducer, and an aerosol focusing system incorporating such a pressure-flow reducer, for performing high-flow, atmosphere-pressure sampling while delivering a tightly focused particle beam in vacuum via an aerodynamic focusing lens stack. The pressure-flow reducer has an inlet nozzle for adjusting the sampling flow rate, a pressure-flow reduction region with a skimmer and pumping ports for reducing the pressure and flow to enable interfacing with low pressure, low flow aerosol focusing devices, and a relaxation chamber for slowing or stopping aerosol particles. In this manner, the pressure-flow reducer decouples pressure from flow, and enables aerosol sampling at atmospheric pressure and at rates greater than 1 liter per minute.

Gard, Eric (San Francisco, CA); Riot, Vincent (Oakland, CA); Coffee, Keith (Diablo Grande, CA); Woods, Bruce (Livermore, CA); Tobias, Herbert (Kensington, CA); Birch, Jim (Albany, CA); Weisgraber, Todd (Brentwood, CA)

2008-04-22T23:59:59.000Z

271

pressure | OpenEI  

Open Energy Info (EERE)

pressure pressure Dataset Summary Description This raw data reflects readings from instruments mounted on or near a 82 meter meteorological tower located at the National Wind Technology Center (NWTC), approximately 5 miles south of Boulder, CO (specifically: 39.9107 N, 105.2348 W, datum WGS84). The base elevation at the site is 1,855 meters AMSL. Source NREL Date Released Unknown Date Updated March 10th, 2011 (3 years ago) Keywords DOE humidity irrandiance NREL NWTC pressure temperature turbulence wind wind direction wind speed Data text/plain icon Raw data (8/24/2001 - 3/10/2011) (txt, 681 KiB) application/vnd.ms-excel icon Field IDs for above .txt file (xls, 69.6 KiB) Quality Metrics Level of Review Some Review Comment Scientists and Technicians are notified real-time via email of instruments outside the above min/max or delta comparisons (http://www.nrel.gov/midc/nwtc_m2/) Data have not been reviewed for accuracy or completeness; disclaimer available (http://www.nrel.gov/disclaimer.html).

272

Differential pressure pin discharge apparatus  

DOE Patents [OSTI]

Disclosed is a discharge assembly for allowing elongate pins to be discharged from an area of relatively low pressure to an area of relatively greater pressure. The discharge assembly includes a duck valve having a lip piece made of flexible material. The flexible lip piece responds to a fluctuating pressure created downstream by an aspirator. The aspirator reduces the downstream pressure sensed by the duck valve when the discharge assembly is in the open position. This allows elongate pins to be moved through the duck valve with no backflow because the aspirator pressure is less than the pressure in the low pressure area from which the pins originate. Closure of the assembly causes the aspirator static pressure to force the flexible duck valve lip piece into a tightly sealed position also preventing backflow. The discharge assembly can be easily controlled using a single control valve which blocks the flow of aspirator gas and closes the pin passageway extending through the assembly.

Oakley, David J. (Richland, WA)

1987-01-01T23:59:59.000Z

273

High-Pressure Hydrogen Tanks  

Broader source: Energy.gov [DOE]

Presentation on High-Pressure Hydrogen Tanks for the DOE Hydrogen Delivery High-Pressure Tanks and Analysis Project Review Meeting held February 8-9, 2005 at Argonne National Laboratory

274

Optical emission spectroscopic diagnostics of a non-thermal atmospheric pressure helium-oxygen plasma jet for biomedical applications  

Science Journals Connector (OSTI)

In this work we have applied optical emission spectroscopy diagnostics to investigate the characteristics of a non-thermal atmospheric pressure helium plasma jet. The discharge characteristics in the active and afterglow region of the plasma jet that are critical for biomedical applications have been investigated. The voltage-current characteristics of the plasma discharge were analyzed and the average plasma power was measured to be around 18?W. The effect of addition of small fractions of oxygen at 0.1%–0.5% on the plasma jet characteristics was studied. The addition of oxygen resulted in a decrease in plasma plume length due to the electronegativity property of oxygen. Atomic and molecular lines of selected reactive plasma species that are considered to be useful to induce biochemical reactions such as OH transitions A 2 ? + ( ? = 0 1 ) ? X 2 ? ( ? ? = 0 ) at 308?nm and A 2 ? + ( ? = 0 1 ) ? X 2 ? ( ? ? = 1 ) at 287?nm O I transitions 3p5P?3s5S0 at 777.41?nm and 3p3P?3s3S0 at 844.6?nm N2(C-B) second positive system with electronic transition C 3 ? u ? ? B 3 ? g ? in the range of 300–450?nm and N2 +(B-X) first negative system with electronic transition B 2 ? u + ? X 2 ? g + ( ? ? = 0 ) at 391.4?nm have been studied. The atomic emission lines of helium were identified including the He I transitions 3p3P0?2s3S at 388.8?nm 3p1P0? 2s1S at 501.6?nm 3d3D?2p3P0 at 587.6?nm 3d1D?2p1P0 at 667.8?nm 3s3S1?2p3P0 at 706.5?nm 3s1S0?2p1P0 at 728.1?nm and H? transition 2p-3d at 656.3?nm. Using a spectral fitting method the OH radicals at 306–312?nm the rotational and vibrational temperatures equivalent to gas temperatures of the discharge was measured and the effective non-equilibrium nature of the plasma jet was demonstrated. Our results show that in the entire active plasma region the gas temperature remains at 310?±?25?K and 340?±?25?K and it increases to 320?±?25?K and 360?±?25?K in the afterglow region of the plasma jet for pure helium and helium/oxygen (0.1%) mixture respectively. Additionally the vibrational temperatures range from 2200?±?100?K and 2500?±?100?K for pure helium and helium/oxygen (0.1%) mixture respectively. The plasma jet was tested on heat sensitive polymer films used in biomedical applications such as polyethylene terephthalate and poly-L-lactide samples continuously for several minutes without causing any physical or thermal damage to the films. The plasma jet produces significant reactive species of interest while the gas temperatures remain very low demonstrating its potential for a range of biomedical applications.

2013-01-01T23:59:59.000Z

275

Method and apparatus for directing ions and other charged particles generated at near atmospheric pressures into a region under vacuum  

DOE Patents [OSTI]

A method and apparatus for focusing dispersed charged particles. More specifically, a series of elements within a region maintained at a pressure between 10.sup.-1 millibar and 1 bar, each having successively larger apertures forming an ion funnel, wherein RF voltages are applied to the elements so that the RF voltage on any element has phase, amplitude and frequency necessary to define a confinement zone for charged particles of appropriate charge and mass in the interior of the ion funnel, wherein the confinement zone has an acceptance region and an emmitance region and where the acceptance region area is larger than the emmitance region area.

Smith, Richard D. (Richland, WA); Shaffer, Scott A. (Seattle, WA)

2000-01-01T23:59:59.000Z

276

Resumming the pressure  

E-Print Network [OSTI]

The convergence properties of the resummed thermal perturbation series for the thermodynamic pressure are investigated by comparison with the exact results obtained in large-N phi^4 theory and possibilities for improvements are discussed. By going beyond conventional resummed perturbation theory, renormalization has to be carried out nonperturbatively yet consistently. This is exemplified in large-N phi^4_4 and in a special large-N \\phi^3_6 model that mimics QED in the limit of large flavour number.

Anton Rebhan

1998-09-21T23:59:59.000Z

277

Electron density measurements of atmospheric-pressure non-thermal N2 plasma jet by Stark broadening and irradiance intensity methods  

Science Journals Connector (OSTI)

An atmospheric-pressure non-thermal plasma jet excited by high frequency alternating current using nitrogen is developed and the electron density in the active region of this plasma jet is investigated by two different methods using optical emission spectroscopy Stark broadening and irradiance intensity method. The irradiance intensity method shows that the average electron density is about 1020/m3 which is slightly smaller than that by the Stark broadening method. However the trend of the change in the electron density with input power obtained by these two methods is consistent.

2014-01-01T23:59:59.000Z

278

Single-Step Process for the Deposition of High Water Contact Angle and High Water Sliding Angle Surfaces by Atmospheric Pressure Dielectric Barrier Discharge  

Science Journals Connector (OSTI)

Single-Step Process for the Deposition of High Water Contact Angle and High Water Sliding Angle Surfaces by Atmospheric Pressure Dielectric Barrier Discharge ... The process used a high voltage alternating current (10?000 or 22?500 Hz) with a constant dissipated power of 100 W (1.1 W cm–2) generated by a Corona generator 7010R from SOFTAL electronic GmbH. ... high adhesion, presumably by generating large van der Waals' forces from the large surface area in very close contact with water. ...

Nicolas D. Boscher; David Duday; Stéphane Verdier; Patrick Choquet

2013-01-22T23:59:59.000Z

279

Combustor oscillation pressure stabilizer  

SciTech Connect (OSTI)

In accordance with the objective of the present invention, the active control of unsteady combustion induced oscillations in a combustion chamber fired by a suitable fuel and oxidizer mixture, such as a hydrocarbon fuel and air mixture, is provided by restructuring and moving the position of the main flame front and thereby increasing the transport time and displacing the pressure wave further away from the in-phase relationship with the periodic heat release. The restructuring and repositioning of the main flame are achieved by utilizing a pilot flame which is pulsed at a predetermined frequency corresponding to less than about one-half the frequency of the combustion oscillation frequency with the duration of each pulse being sufficient to produce adequate secondary thermal energy to restructure the main flame and thereby decouple the heat release from the acoustic coupling so as to lead to a reduction in the dynamic pressure amplitude. The pulsating pilot flame produces a relatively small and intermittently existing flame front in the combustion zone that is separate from the oscillating main flame front but which provides the thermal energy necessary to effectively reposition the location of the oscillating main flame front out of the region in the combustion zone where the acoustic coupling can occur with the main flame and thereby effectively altering the oscillation-causing phase relationship with the heat of combustion.

Gemmen, R.S.; Richards, G.A.; Yip, M.T.J.; Robey, E.; Cully, S.R.; Addis, R.E.

1996-12-31T23:59:59.000Z

280

Stabilizing System Pressure | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

System Pressure This tip sheet summarizes three methods used to stabilize compressed air system pressure: adequate primary and secondary storage, PressureFlow Controllers (P...

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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

Theoretical collapse pressures for two pressurized torispherical heads  

SciTech Connect (OSTI)

In order to determine the pressures at which real torispherical heads fail upon a single application of pressure, two heads were pressurized in recent Praxair tests, and displacements and strains were recorded at various locations. In this paper, theoretical results for the two test heads are presented in the form of curves of pressure versus crown deflections, using the available geometry and material parameters. From these curves, limit and collapse pressures are calculated, using procedures permitted by the ASME B and PV Code Section 8/Div.2. These pressures are shown to vary widely, depending on the method and model used to calculate them. The effect of no stress relief on the behavior of the Praxair test heads is also evaluated and found to be of no significance for neither the objectives of the tests nor the objectives of this paper. The results of this paper are submitted as an enhancement to the experimental results recorded during the Praxair tests.

Kalnins, A.; Updike, D.P. [Lehigh Univ., Bethlehem, PA (United States); Rana, M.D. [Praxair, Inc., Tonawanda, NY (United States). Research and Development Dept.

1995-12-01T23:59:59.000Z

282

Cradle and pressure grippers  

DOE Patents [OSTI]

A gripper that is designed to incorporate the functions of gripping, supporting and pressure tongs into one device. The gripper has two opposing finger sections with interlocking fingers that incline and taper to form a wedge. The interlocking fingers are vertically off-set so that the opposing finger sections may close together allowing the inclined, tapered tips of the fingers to extend beyond the plane defined by the opposing finger section's engagement surface. The range of motion defined by the interlocking relationship of the finger sections allows the gripper to grab, lift and support objects of varying size and shape. The gripper has one stationary and one moveable finger section. Power is provided to the moveable finger section by an actuating device enabling the gripper to close around an object to be lifted. A lifting bail is attached to the gripper and is supported by a crane that provides vertical lift.

Muniak, John E. (New York, NY)

2001-01-01T23:59:59.000Z

283

Wind Tunnel Evaluation of PAM II Pressure Ports  

Science Journals Connector (OSTI)

The Portable Automated Mesonet II (PAM II) is a network of automated remote weather stations developed by the National Center for Atmospheric Research (NCAR) for measuring wind speed and direction, atmospheric pressure, temperature, humidity, and ...

Fikri Adnan Akyüz; Henry Liu; Tom Horst

1991-06-01T23:59:59.000Z

284

Steam Oxidation at High Pressure  

SciTech Connect (OSTI)

A first high pressure test was completed: 293 hr at 267 bar and 670{degrees}C; A parallel 1 bar test was done for comparison; Mass gains were higher for all alloys at 267 bar than at 1 bar; Longer term exposures, over a range of temperatures and pressures, are planned to provide information as to the commercial implications of pressure effects; The planned tests are at a higher combination of temperatures and pressures than in the existing literature. A comparison was made with longer-term literature data: The short term exposures are largely consistent with the longer-term corrosion literature; Ferritic steels--no consistent pressure effect; Austenitic steels--fine grain alloys less able to maintain protective chromia scale as pressure increases; Ni-base alloys--more mass gains above 105 bar than below. Not based on many data points.

Holcomb, Gordon R. [NETL; Carney, Casey [URS

2013-07-19T23:59:59.000Z

285

Neutron scattering at high pressure  

Science Journals Connector (OSTI)

Neutron scattering spectra at pressures up to 30 kilobar in the temperature range 300–4 K have been obtained with a compact clamped type apparatus. The pressure cell geometry by allowing the detection of neutronsscattered in a plane makes it compatible with operation on crystal spectrometers both for elastic and inelastic scattering. The instrument is light (4.5 kg) and easy to move. An external diameter of 68 mm makes the pressure cell adaptable to standard cryostats or furnaces.

D. Bloch; J. Paureau; J. Voiron; G. Parisot

1976-01-01T23:59:59.000Z

286

Pressure testing of torispherical heads  

SciTech Connect (OSTI)

Two vessels fabricated from SA516-70 steel with 6% knuckle radius torispherical heads were tested under internal pressure to failure. The D/t ratios of Vessel 1 and Vessel 2 were 238 and 185 respectively. The calculated maximum allowable working pressures of Vessel 1 and 2 heads using the ASME Section 8, Div. 1 rules and measured dimensions were 85 and 110 psi, respectively. Vessel 1 failed at a nozzle weld in the cylindrical shell at 700 psi pressure. Neither buckling nor any other objectionable deformation of the head was observed at a theoretical double-elastic-slope collapse pressure of 241 and a calculated buckling pressure of 270 psi. Buckles were observed developing slowly after 600 psi pressure, and a total of 22 buckles were observed after the test, having the maximum amplitude of 0.15 inch. Vessel 2 failed at the edge of the longitudinal weld of the cylindrical shell at 1,080 psi pressure. Neither buckling nor any other objectionable deformation of the head was observed up to the final pressure, which exceeded the theoretical double-elastic-slope collapse and calculated buckling pressures of 274 psi and 342 psi, respectively.

Rana, M.D. [Praxair, Inc., Tonawanda, NY (United States). Research and Development Dept.; Kalnins, A.; Updike, D.P. [Lehigh Univ., Bethlehem, PA (United States)

1995-12-01T23:59:59.000Z

287

Pressure Vessel Burst Program: Automated hazard analysis for pressure vessels  

SciTech Connect (OSTI)

The design, development, and use of a Windows based software tool, PVHAZARD, for pressure vessel hazard analysis is presented. The program draws on previous efforts in pressure vessel research and results of a Pressure Vessel Burst Test Study. Prior papers on the Pressure Vessel Burst Test Study have been presented to the ASME, AIAA, JANNAF, NASA Pressure Systems Seminar, and to a DOD Explosives Safety Board subcommittee meeting. Development and validation is described for simplified blast (overpressure/impulse) and fragment (velocity and travel distance) hazard models. The use of PVHAZARD in making structural damage and personnel injury estimates is discussed. Efforts in-progress are reviewed including the addition of two-dimensional and three-dimensional (2D and 3D) hydrodynamic code analyses to supplement the simplified models, and the ability to assess barrier designs for protection from fragmentation.

Langley, D.R. [Aerospace Corp., Kennedy Space Center, FL (United States); Chrostowski, J.D. [ACTA Inc., Torrance, CA (United States); Goldstein, S. [Aerospace Corp., El Segundo, CA (United States); Cain, M. [General Physics Corp., Titusville, FL (United States)

1996-12-31T23:59:59.000Z

288

Electrokinetically pumped high pressure sprays  

DOE Patents [OSTI]

An electrokinetic pump capable of producing high pressure is combined with a nozzle having a submicron orifice to provide a high pressure spray device. Because of its small size, the device can be contained within medical devices such as an endoscope for delivering biological materials such as DNA, chemo therapeutic agents, or vaccines to tissues and cells.

Schoeniger, Joseph S. (Oakland, CA); Paul, Phillip H. (Livermore, CA); Schoeniger, Luke (Pittsford, NY)

2005-11-01T23:59:59.000Z

289

Growth of HfO{sub 2} films using an alternate reaction of HfCl{sub 4} and O{sub 2} under atmospheric pressure  

SciTech Connect (OSTI)

HfO{sub 2} films were deposited onto a Si(100) substrate using an alternate reaction of HfCl{sub 4} and O{sub 2} under atmospheric pressure. Self-limiting growth of the HfO{sub 2} was achieved in the range of the growth temperature above 873K. The X-ray diffraction of the HfO{sub 2} films showed a typical diffraction pattern assigned to the monoclinic polycrystalline phase. Residual chloride concentration in HfO{sub 2} films were not higher than 0.1at%. When the growth temperature was 973K, the HfSiO{sub x} is formed in HfO{sub 2} film. This gives effective permittivity value of 9.6 for the HfO{sub 2} film grown at 573K.

Takahashi, Naoyuki [Department of Materials Science and Technology, Faculty of Engineering Shizuoka University, 3-5-1 Johoku, Hamamatu, Shizuoka 432-8561 (Japan)]. E-mail: tntakah@ipc.shizuoka.ac.jp; Nonobe, Shinichi [Department of Materials Science and Technology, Faculty of Engineering Shizuoka University, 3-5-1 Johoku, Hamamatu, Shizuoka 432-8561 (Japan); Nakamura, Takato [Department of Materials Science and Technology, Faculty of Engineering Shizuoka University, 3-5-1 Johoku, Hamamatu, Shizuoka 432-8561 (Japan)

2004-11-01T23:59:59.000Z

290

High-Pressure Hydrogen Tanks  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

February 8 February 8 th , 2005 Mark J. Warner, P.E. Principal Engineer Quantum Technologies, Inc. Irvine, CA Low Cost, High Efficiency, Low Cost, High Efficiency, High Pressure Hydrogen Storage High Pressure Hydrogen Storage This presentation does not contain any proprietary or confidential information. 70 MPa Composite Tanks Vent Line Ports Defueling Port (optional) Fill Port Filter Check Valve Vehicle Interface Bracket with Stone Shield In Tank Regulator with Solenoid Lock-off Pressure Relief Device Manual Valve Compressed Hydrogen Storage System In-Tank Regulator Pressure Sensor (not visible here) Pressure Relief Device (thermal) In Tank Gas Temperature Sensor Carbon Composite Shell (structural) Impact Resistant Outer Shell (damage resistant) Gas Outlet Solenoid Foam Dome (impact protection)

291

NETL: Pressure Swing Absorption Device  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Pressure Swing Absorption Device and Process for Separating CO2 from Shifted Syngas and its Capture for Subsequent Storage Pressure Swing Absorption Device and Process for Separating CO2 from Shifted Syngas and its Capture for Subsequent Storage Project No.: DE-FE0001323 New Jersey Institute of Technology is developing an advanced pressure swing absorption-based (PSAB) device via laboratory-based experiments. The device will be used to accomplish a cyclic process to process low temperature post-shift-reactor synthesis gas resulting from the gasification process into purified hydrogen at high pressure for use by the combustion turbine of an integrated gasification combined cycle (IGCC) plant. The overall goal of the proposed work is to develop an advanced PSAB device and cyclic process for use in a coal-fired IGCC plant to produce purified hydrogen at high pressure and a highly purified CO2 stream suitable for use or sequestration.

292

Fundamentals of high pressure adsorption  

SciTech Connect (OSTI)

High-pressure adsorption attracts research interests following the world's attention to alternative fuels, and it exerts essential effect on the study of hydrogen/methane storage and the development of novel materials addressing to the storage. However, theoretical puzzles in high-pressure adsorption hindered the progress of application studies. Therefore, the present paper addresses the major theoretical problems that challenged researchers: i.e., how to model the isotherms with maximum observed in high-pressure adsorption; what is the adsorption mechanism at high pressures; how do we determine the quantity of absolute adsorption based on experimental data. Ideology and methods to tackle these problems are elucidated, which lead to new insights into the nature of high-pressure adsorption and progress in application studies, for example, in modeling multicomponent adsorption, hydrogen storage, natural gas storage, and coalbed methane enrichment, was achieved.

Zhou, Y.P.; Zhou, L. [Tianjin University, Tianjin (China). High Pressure Adsorption Laboratory

2009-12-15T23:59:59.000Z

293

Electrokinetic high pressure hydraulic system  

DOE Patents [OSTI]

An electrokinetic high pressure hydraulic pump for manipulating fluids in capillary-based systems. The pump uses electro-osmotic flow to provide a high pressure hydraulic system, having no moving mechanical parts, for pumping and/or compressing fluids, for providing valve means and means for opening and closing valves, for controlling fluid flow rate, and manipulating fluid flow generally and in capillary-based systems (Microsystems), in particular. The compact nature of the inventive high pressure hydraulic pump provides the ability to construct a micro-scale or capillary-based HPLC system that fulfills the desire for small sample quantity, low solvent consumption, improved efficiency, the ability to run samples in parallel, and field portability. Control of pressure and solvent flow rate is achieved by controlling the voltage applied to an electrokinetic pump.

Paul, Phillip H. (Livermore, CA); Rakestraw, David J. (Fremont, CA); Arnold, Don W. (Livermore, CA); Hencken, Kenneth R. (Pleasanton, CA); Schoeniger, Joseph S. (Oakland, CA); Neyer, David W. (Castro Valley, CA)

2001-01-01T23:59:59.000Z

294

Low pressure carbonylation of heterocycles  

DOE Patents [OSTI]

Heterocycles, e.g., epoxides, are carbonylated at low pressure with high percentage conversion to cyclic, ring expanded products using the catalyst ##STR00001## where L is tetrahydrofuran (THF).

Coates, Geoffrey W. (Lansing, NY); Kramer, John W. (Mt. Pleasant, MI); Schmidt, Joseph A. R. (Sylvania, OH)

2011-01-25T23:59:59.000Z

295

High Pressure Hydrogen Tank Manufacturing  

Broader source: Energy.gov (indexed) [DOE]

Cycles Fuel Lines * 10,000 psi nominal working pressure * O-ring face seal connections * CNC bent to CAD data * 316 Stainless Steel (Other materials available) * Welded end form or...

296

Pressure compensated flow control valve  

DOE Patents [OSTI]

The invention is an air flow control valve which is capable of maintaining a constant flow at the outlet despite changes in the inlet or outlet pressure. The device consists of a shell assembly with an inlet chamber and outlet chamber separated by a separation plate. The chambers are connected by an orifice. Also located within the inlet chamber is a port controller assembly. The port controller assembly consists of a differential pressure plate and port cap affixed thereon. The cap is able to slide in and out of the orifice separating the inlet and outlet chambers. When the pressure differential is sufficient, the differential pressure plate rises or falls to maintain a constant air flow. Movement of the port controller assembly does not require the use of seals, diaphragms, tight tolerances, bushings, bearings, hinges, guides, or lubricants.

Minteer, Daniel J. (West Richland, WA)

1999-01-01T23:59:59.000Z

297

BIOMACROMOLECULES UNDER HIGH HYDROSTATIC PRESSURE  

E-Print Network [OSTI]

of water into the protein rather than the transfer of hydrophobic residues into water. To investigate water. Gil Toombes for teaching me SAXS analysis and help with the pressure pump motor control, Buz Barstow

Gruner, Sol M.

298

Studying Materials Under Extreme Pressure  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Studying Materials Under Extreme Pressure Studying Materials Under Extreme Pressure Coupling undulator radiation from Advanced Photon Source (APS) beamlines 3-ID and 13-ID to nuclear resonant inelastic scattering techniques, researchers have determined the phonon density of states for iron under pressures up to 153 gigapascals, equivalent to those found at the Earth's core. Image of the Earth's core. Although indirect measurements and theory have, since the early 1950s, produced an informed picture of the structure and composition of the materials that make up the core of the Earth, direct proof and the answers to some intriguing questions remain unanswered. Previously, ultrahigh-pressure experiments using nuclear resonant inelastic scattering have been difficult to carry out due the tiny samples required.

299

Measuring the pressure in ultrahigh-pressure mercury arcs  

SciTech Connect (OSTI)

Ultrahigh-pressure (UHP) mercury lamps are important as high-brightness light sources for digital projection. Hg pressures are usually above 20 MPa and difficult to measure. We have built special UHP lamps with a liquid Hg condensate in a temperature-controlled reservoir, allowing us to tune the Hg vapor pressure p between 14 and 30 MPa. As a simple measure for p, we recorded the width DELTAlambda of the 546 nm Hg line while varying p and also the lamp current I and voltage U. The data define a function p(DELTAlambda,I,U) that will deliver p to better than 3% from simple measurements of DELTAlambda, I, and U for most UHP lamps in the important 100-200 W power range. The method is applied to sample lamps, yielding pressures up to 26 MPa and demonstrating how filled Hg amount, burning position, arc gap, and lamp power affect the pressure. The effective temperature of typical UHP lamps is found to be 2400 K. We also derive an improved characteristic U(d,p,I) for the dependence of the arc voltage on arc gap, pressure, and current for electrode-stabilized Hg discharges in the UHP regime. Some aspects of the experiment are of general interest in the field of discharge lamps, such as a model for the heat balance of the Hg condensate under conductive, radiative, and evaporative cooling/heating, a short discussion of high-temperature vapor-pressure data for Hg, and an improved Hg equation of state for UHP conditions.

Hechtfischer, U.; Engelbrecht, B.; Carpaij, M.; Fischer, E.; Koerber, A. [Philips Research Laboratories, Weisshausstrasse 2, 52066 Aachen (Germany)

2009-09-01T23:59:59.000Z

300

Endografts, Pressure, and the Abdominal Aortic Aneurysm  

E-Print Network [OSTI]

surveillance protocols [28]. The relationship between peripheral arterial pressure and aortic pulse pressure was shown to be an underestimation of the pulse pressure within the abdominal aorta by a mean of 10% with a sphygmomanometer which was similar to a...

Meyer, Clark A.

2010-07-14T23:59:59.000Z

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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

Flexible Pressure Sensors: Modeling and Experimental Characterization  

E-Print Network [OSTI]

Flexible capacitive pressure sensors fabricated with nanocomposites were experimentally characterized and results compared with simulations from analytical modeling. Unlike traditional diaphragm silicon pressure sensors, ...

Viana, J.C.

302

Atmospheric Water Vapor Pressure over Land Surfaces: A Generic Algorithm with Data Input Limited to Air Temperature, Precipitation and Geographic Location  

Science Journals Connector (OSTI)

A lack of information for surface water vapor pressure (WVP) represents a major impediment to model-assisted ecosystem analysis for understanding plant-environment interactions or for projecting biospheric re...

X. Yin

1999-08-01T23:59:59.000Z

303

An improved approach for hydrogen analysis in metal samples using single laser-induced gas plasma and target plasma at helium atmospheric pressure  

Science Journals Connector (OSTI)

We report in this paper the results of an experimental study on hydrogen analysis of solid samples in high pressure helium ambient gas employing the basic scheme of laser induced breakdown spectroscopy (LIBS)....

S.N. Abdulmadjid; M.M. Suliyanti; K.H. Kurniawan; T.J. Lie; M. Pardede…

2006-01-01T23:59:59.000Z

304

High pressure synthesis gas conversion. Task 3: High pressure profiles  

SciTech Connect (OSTI)

The purpose of this research project was to build and test a high pressure fermentation system for the production of ethanol from synthesis gas. The fermenters, pumps, controls, and analytical system were procured or fabricated and assembled in our laboratory. This system was then used to determine the effects of high pressure on growth and ethanol production by C. 1jungdahlii. The limits of cell concentration and mass transport relationships were found in CSTR and immobilized cell reactors (ICR). The minimum retention times and reactor volumes were found for ethanol production in these reactors.

Not Available

1993-05-01T23:59:59.000Z

305

Surface modification of biphasic calcium phosphate scaffolds by non-thermal atmospheric pressure nitrogen and air plasma treatment for improving osteoblast attachment and proliferation  

Science Journals Connector (OSTI)

Abstract Surface modifications induced by non-thermal plasma have been used extensively in biomedical applications. The attachment and proliferation of osteoblast cells are important in bone tissue engineering using scaffolds. Hence the effect of non-thermal plasma on hydroxyapatite/?-tri-calcium phosphate (HA/?-TCP) scaffolds in terms of improving osteoblast attachment and proliferation was investigated. Experimental groups were treated with non-thermal plasma for 10 min and 20 min and a control group was not treated with non-thermal plasma. For surface chemistry analysis, X-ray photoelectron spectroscopy (XPS) analysis was carried out. The hydrophilicity was determined from contact angle measurement on the surface. Atomic force microscopy analysis (AFM) was used to test the change in surface roughness and cell attachment and proliferation were evaluated using MC3T3-E1 osteoblast cells. XPS spectra revealed a decreased amount of carbon on the surface of the plasma-treated sample. The contact angle was also decreased following plasma treatment, indicating improved hydrophilicity of plasma-treated surfaces compared to the untreated disc. A significant increase in MC3T3E-1 cell attachment and proliferation was noted on plasma-treated samples as compared to untreated specimens. The results suggest that non-thermal atmospheric pressure nitrogen and air plasma treatments provide beneficial surface characteristics on HA/?-TCP scaffolds.

Yu-Ri Choi; Jae-Sung Kwon; Doo-Hoon Song; Eun Ha Choi; Yong-Keun Lee; Kyoung-Nam Kim; Kwang-Mahn Kim

2013-01-01T23:59:59.000Z

306

On the performance and mechanisms of toluene removal by FeOx/SBA-15-assisted non-thermal plasma at atmospheric pressure and room temperature  

Science Journals Connector (OSTI)

Abstract FeOx/SBA-15 catalysts were prepared via impregnation and utilized for toluene removal in dielectric barrier discharge (DBD) plasma at atmospheric pressure and room temperature. Toluene removal was investigated in the environment of various mixed N2/O2 plasmas, showing that toluene removal efficiency and \\{COx\\} selectivity were greatly increased by FeOx/SBA-15 and that the organic intermediates were greatly reduced by catalysts. In pure N2 plasma, the bulk oxygen in the catalyst was involved in the toluene oxidation, and the 3%FeOx/SBA-15 catalyst showed the optimal toluene oxidation activity. The catalysts were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), N2 adsorption–desorption, X-ray photoelectron spectroscopy (XPS), H2 temperature-programmed reduction (H2-TPR) and O2 temperature-programmed desorption (O2-TPD), showing that toluene oxidation was closely related to the highly dispersed nature of iron on the SBA-15 surface, the reduction temperature of Fe2+ and the oxygen adsorption ability of the catalyst. The pathways of toluene decomposition in the combination of FeOx/SBA-15 with a non-thermal plasma (NTP) system were proposed based on the identified intermediates.

Meijuan Lu; Rong Huang; Junliang Wu; Mingli Fu; Limin Chen; Daiqi Ye

2015-01-01T23:59:59.000Z

307

Characteristics of high-purity Cu thin films deposited on polyimide by radio-frequency Ar/H2 atmospheric-pressure plasma jet  

Science Journals Connector (OSTI)

With a view to fabricating future flexible electronic devices an atmospheric-pressure plasma jet driven by 13.56?MHz radio-frequency power is developed for depositing Cu thin films on polyimide where a Cu wire inserted inside the quartz tube was used as the evaporation source. A polyimide substrate is placed on a water-cooled copper heat sink to prevent it from being thermally damaged. With the aim of preventing oxidation of the deposited Cu film we investigated the effect of adding H2 to Ar plasma on film characteristics. Theoretical fitting of the OH emission line in OES spectrum revealed that adding H2 gas significantly increased the rotational temperature roughly from 800 to 1500?K. The LMM Auger spectroscopy analysis revealed that higher-purity Cu films were synthesized on polyimide by adding hydrogen gas. A possible explanation for the enhancement in the Cu film deposition rate and improvement of purity of Cu films by H2 gas addition is that atomic hydrogen produced by the plasma plays important roles in heating the gas to promote the evaporation of Cu atoms from the Cu wire and removing oxygen from copper oxide components via reduction reaction.

P. Zhao; W. Zheng; Y. D. Meng; M. Nagatsu

2013-01-01T23:59:59.000Z

308

Simultaneous determination of nine trace mono- and di-chlorophenols in water by ion chromatography atmospheric pressure chemical ionization mass spectrometry  

Science Journals Connector (OSTI)

A novel analytical method was proposed for the rapidly simultaneous determination of nine mono-chlorophenols (MCPs) and di-chlorophenols (DCPs) in water samples using eluent generator ion chromatography (IC) coupled with an atmospheric pressure chemical ionization mass spectrometry (APCI-MS) in the negative mode. The IC separation was carried out on an IonPac® AS11 analytical column (250 mm × 4.0 mm) using gradient KOH containing 15% acetonitrile as organic modifier at a constant flow rate of 1.0 mL/min. The molecular ions m/z [M ? H]? 127 and 161 were selected for the quantification in selected ion monitoring (SIM) mode for \\{MCPs\\} and DCPs, respectively. The average recoveries were between 80.6% and 92.6%. Within-day and day-to-day relative standard deviations were less than 12.1% and 13.3%, respectively. The method allowed the nine objective compounds in water samples to be determined at ?g/L levels. It was confirmed that this method could be used in routine analysis.

Micong Jin; Yiwen Yang

2006-01-01T23:59:59.000Z

309

Microcrystalline Si films grown at low temperatures (90-220 deg. C) with high rates in atmospheric-pressure VHF plasma  

SciTech Connect (OSTI)

This work deals with the structural properties of microcrystalline silicon (muc-Si:H) films grown at low temperatures (90-220 deg. C) with high rates in atmospheric-pressure He/H{sub 2}/SiH{sub 4} plasma, which is excited by a 150 MHz very high frequency power using a porous carbon electrode. This plasma permits to enhance the chemical reactions both in gas phase and on the film-growing surface, while suppressing ion impingement upon the surface. Raman crystalline volume fractions of the muc-Si:H films are studied in detail as functions of film thickness and substrate temperature (T{sub sub}). The results show that the muc-Si:H film deposited with 50 (SCCM) (SCCM denotes standard cubic centimeters per minute at STP) SiH{sub 4} has no amorphous transition layers at the film/substrate interface in spite of the high deposition rate of 6.4 nm/s, which is verified by the cross sectional observations with a transmission electron microscope. In addition, the T{sub sub} dependence of Raman crystallinity of the muc-Si:H films indicates that a highly crystallized muc-Si:H film grows even when T{sub sub} is reduced to 90 deg. C. Further systematic studies are needed for both device applications and deposition on thermally sensitive plastic materials.

Kakiuchi, Hiroaki; Ohmi, Hiromasa; Ouchi, Kentaro; Tabuchi, Keita; Yasutake, Kiyoshi [Department of Precision Science and Technology, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871 (Japan)

2009-07-01T23:59:59.000Z

310

Preparation of TiO{sub 2} thin films on the inner surface of a quartz tube using atmospheric-pressure microplasma  

SciTech Connect (OSTI)

Titanium dioxide (TiO{sub 2}) thin films were prepared on the inner surface of a quartz tube, with inner and outer diameters of 1 and 3 mm, respectively, using plasma-enhanced chemical vapor deposition with titanium tetraisopropoxide and oxygen (O{sub 2}) as reactants and helium as the carrier gas at atmospheric pressure. A microplasma was generated inside the tube by rf (13.56 MHz) excitation using externally attached parallel-plate electrodes. The characteristics of the deposited films were examined by scanning electron microscopy, x-ray photoelectron spectroscopy, and x-ray diffraction. A typical as-deposited film had an amorphous structure with a smooth surface and was transparent. With increasing O{sub 2} concentration in the plasma gas phase, the deposited film surface was covered with a large number of TiO{sub 2} nanoparticles. However, the deposited films were a mixture of TiO{sub 2} and amorphous carbon and showed rough surface in the absence of O{sub 2} in the source gas. The effects of the O{sub 2} concentration in the plasma gas on the characteristics of the deposited TiO{sub 2} films are discussed on the basis of the analysis of the gas species generated in the plasma using optical emission spectroscopy.

Yoshiki, Hiroyuki; Saito, Taku [Department of Electrical and Electronic Engineering, Tsuruoka National College of Technology, 104 Inooka-Sawada, Tsuruoka, Yamagata 997-8511 (Japan)

2008-05-15T23:59:59.000Z

311

Low-Pressure, Metastable Growth of Diamond and "Diamondlike" Phases  

Science Journals Connector (OSTI)

...HYDROCARBON PLASMA, THIN SOLID...MICROWAVE PLASMA, JOURNAL...KAWARADA, H, LARGE AREA CHEMICAL...MAGNETOMICROWAVE PLASMA, JAPANESE...CARBON-FILMS BY RF GLOW-DISCHARGE...INDUCTION THERMAL PLASMA...DIAMOND AT ATMOSPHERIC-PRESSURE...JOURNAL OF NON-CRYSTALLINE...

JOHN C. ANGUS; CLIFF C. HAYMAN

1988-08-19T23:59:59.000Z

312

Variable pressure operation: An assessment  

SciTech Connect (OSTI)

This report summarizes the benefits, drawbacks, and technical issues of variable pressure operation (VPO) retrofit. Under VPO, turbine throttle pressure is reduced at low loads. This operating mode offers several significant advantages for units that cycle or operate at low loads for extended periods. Information used in the report was assembled from published sources, from major equipment manufacturers, and from utilities operating units under VPO in the US, Europe and Japan. The report also contains statistics of VPO use in this country and abroad. Design features of new units using VPO in Europe and Japan are presented to identify potential directions for future US designs incorporating VPO.

Kimel, E.; Kemeny, P.; Bierman, E.; Lagomarsino, J.; Clarke, D. (Burns and Roe, Inc., Oradell, NJ (USA))

1990-03-01T23:59:59.000Z

313

Graphene Nucleation Density on Copper: Fundamental Role of Background Pressure Ivan Vlassiouk,*  

E-Print Network [OSTI]

1 Graphene Nucleation Density on Copper: Fundamental Role of Background Pressure Ivan Vlassiouk the effect of background pressure and synthesis temperature on the graphene crystal sizes in chemical vapor of the background pressure and provide the activation energy for graphene nucleation in atmospheric pressure CVD (9

Feenstra, Randall

314

Stirling engine with pressurized crankcase  

SciTech Connect (OSTI)

A two piston Stirling engine wherein the pistons are coupled to a common crankshaft via bearing means, the pistons include pad means to minimize friction between the pistons and the cylinders during reciprocation of the pistons, means for pressurizing the engine crankcase, and means for cooling the crankshaft and the bearing means eliminating the need for oil in the crankcase.

Corey, John A. (Melrose, NY)

1988-01-01T23:59:59.000Z

315

Gas Exchange, Partial Pressure Gradients,  

E-Print Network [OSTI]

Gas Exchange, Partial Pressure Gradients, and the Oxygen Window Johnny E. Brian, Jr., M of circulatory and gas transport physiology, and the best place to start is with normobaric physiology. LIFE affect the precise gas exchange occurring in individual areas of the lungs and body tissues. To make

Riba Sagarra, Jaume

316

Recent high pressure photoluminescence studies  

SciTech Connect (OSTI)

In this paper we discuss two studies involving the effect of pressure on luminescence properties of organic molecules in polymeric media. (1) The efficiency of energy transfer from Coumarine 138 to Rhodamine B in polyacrylic acid (PAA) is measured by both steady state and time dependent methods. The Forster efficiency'' obtained by these two methods is consistent and shows the same pressure dependence as efficiencies derived from relative peak intensities. The non-monotonic pressure dependence of the efficiency is accounted for in terms of the properties of the molecules and the media. (2) The effect of pressure on the luminescent efficiency of molecules with two or more possible excited state geometries has been measured. The efficiency is described in terms of the non-radiative dissipation of energy from a planar excited state and the rates of crossing to and from the possible twisted states as well as non-radiative decay from these states. The processes involved in these two studies are pertinent to a number of technologically and biologically important processes. [copyright]American Institute of Physics

Drickamer, H.G.; Lang, J.M.; Dreger, Z.A. (Department of Chemical Engineering, University of Illinois, 1209 W. California Street, Urbana, Illinois 61801 (United States))

1994-07-10T23:59:59.000Z

317

Surface texturing of superconductors by controlled oxygen pressure  

DOE Patents [OSTI]

A method of manufacture of a textured layer of a high temperature superconductor on a substrate. The method involves providing an untextured high temperature superconductor material having a characteristic ambient pressure peritectic melting point, heating the superconductor to a temperature below the peritectic temperature, establishing a reduced pO.sub.2 atmosphere below ambient pressure causing reduction of the peritectic melting point to a reduced temperature which causes melting from an exposed surface of the superconductor and raising pressure of the reduced pO.sub.2 atmosphere to cause solidification of the molten superconductor in a textured surface layer.

Chen, Nan (Downers Grove, IL); Goretta, Kenneth C. (Downers Grove, IL); Dorris, Stephen E. (La Grange Park, IL)

1999-01-01T23:59:59.000Z

318

Surface texturing of superconductors by controlled oxygen pressure  

DOE Patents [OSTI]

A method of manufacture of a textured layer of a high temperature superconductor on a substrate is disclosed. The method involves providing an untextured high temperature superconductor material having a characteristic ambient pressure peritectic melting point, heating the superconductor to a temperature below the peritectic temperature, establishing a reduced pO{sub 2} atmosphere below ambient pressure causing reduction of the peritectic melting point to a reduced temperature which causes melting from an exposed surface of the superconductor and raising pressure of the reduced pO{sub 2} atmosphere to cause solidification of the molten superconductor in a textured surface layer. 8 figs.

Chen, N.; Goretta, K.C.; Dorris, S.E.

1999-01-05T23:59:59.000Z

319

Optical and electrical characterization of an atmospheric pressure microplasma jet for Ar/CH{sub 4} and Ar/C{sub 2}H{sub 2} mixtures  

SciTech Connect (OSTI)

A rf microplasma jet working at atmospheric pressure has been characterized for Ar, He, and Ar/CH{sub 4} and Ar/C{sub 2}H{sub 2} mixtures. The microdischarge has a coaxial configuration, with a gap between the inner and outer electrodes of 250 {mu}m. The main flow runs through the gap of the coaxial structure, while the reactive gases are inserted through a capillary as inner electrode. The discharge is excited using a rf of 13.56 MHz, and rms voltages around 200-250 V and rms currents of 0.4-0.6 A are obtained. Electron densities around 8x10{sup 20} m{sup -3} and gas temperatures lower than 400 K have been measured using optical emission spectroscopy for main flows of 3 slm and inner capillary flows of 160 SCCM. By adjusting the flows, the flow pattern prevents the mixing of the reactive species with the ambient air in the discharge region, so that no traces of air are found even when the microplasma is operated in an open atmosphere. This is shown in Ar/CH{sub 4} and Ar/C{sub 2}H{sub 2} plasmas, where no CO and CN species are present and the optical emission spectroscopy spectra are mainly dominated by CH and C{sub 2} bands. The ratio of these two species follows different trends with the amount of precursor for Ar/CH{sub 4} and Ar/C{sub 2}H{sub 2} mixtures, showing the presence of distinct chemistries in each of them. In Ar/C{sub 2}H{sub 2} plasmas, CH{sub x} species are produced mainly by electron impact dissociation of C{sub 2}H{sub 2} molecules, and the CH{sub x}/C{sub 2}H{sub x} ratio is independent of the precursor amount. In Ar/CH{sub 4} mixtures, C{sub 2}H{sub x} species are formed mainly by recombination of CH{sub x} species through three-body reactions, so that the CH{sub x}/C{sub 2}H{sub x} ratio depends on the amount of CH{sub 4} present in the mixture. All these properties make our microplasma design of great interest for applications such as thin film growth or surface treatment.

Yanguas-Gil, A.; Focke, K.; Benedikt, J.; Keudell, A. von [Arbeitsgruppe Reaktive Plasmen, Fakultaet fuer Physik und Astronomie, Ruhr Universitaet Bochum, Universitaetsstrasse 150, 44780 Bochum (Germany)

2007-05-15T23:59:59.000Z

320

Energy characteristics of an electron-beam-controlled atmospheric-pressure CO/sub 2/ laser utilizing CO/sub 2/--N/sub 2/--H/sub 2/O mixtures  

SciTech Connect (OSTI)

An experimental investigation was made of the energy characteristics of a pulsed electron-beam-controlled atmospheric-pressure CO/sub 2/ laser utilizing CO/sub 2/--N/sub 2/--H/sub 2/O mixtures as a function of the gas mixture composition, of the electric field strength, and of the specific pump power. The energy parameters of the laser were calculated for the experimental conditions. Qualitative and quantitative agreement was obtained between the calculated and experimentally measured data.

Krasyukov, A.G.; Likhanskii, V.V.; Naumov, V.G.; Panchenko, Y.M.; Petrushevich, Y.V.; Pis'mennyi, V.D.; Shachkin, L.V.

1983-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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

Plasma pressure compaction of nanodiamond  

Science Journals Connector (OSTI)

Detonation synthesized nanodiamond (ND) was sintered using a Plasma Pressure Compaction (P2C) technique. Sintering was performed for 1 min at temperatures between 700 and 1200 °C, and for 1–10 min at 900 °C under 65 MPa pressure. Structure and composition of the sintered samples were analyzed by X-ray diffraction, transmission electron microscopy and Raman microspectroscopy. The selected sintering conditions prevent excessive graphitization of diamond and allow formation of porous pellets having the density of 1.3–1.6 g/cm3, hardness > 0.1 GPa and Young's modulus > 3 GPa. The sintered ND pellets with porosity of about 50% have mechanical properties sufficient for handling and can be infiltrated to produce ND composites.

Sebastian Osswald; Adrian Gurga; Franklyn Kellogg; Kyu Cho; Gleb Yushin; Yury Gogotsi

2007-01-01T23:59:59.000Z

322

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

323

Variable pressure thermal insulating jacket  

DOE Patents [OSTI]

A device for controlled insulation of a thermal device is disclosed. The device includes a thermal jacket with a closed volume able to be evacuated to form an insulating jacket around the thermal source. A getter material is in communication with the closed volume of the thermal jacket. The getter material can absorb and desorb a control gas to control gas pressure in the volume of the thermal jacket to control thermal conductivity in the thermal jacket. 10 figs.

Nelson, P.A.; Malecha, R.F.; Chilenskas, A.A.

1994-09-20T23:59:59.000Z

324

Anaesthetic machine pipeline inlet pressure gauges do not always measure pipeline pressure  

Science Journals Connector (OSTI)

Some anaesthetic gas machines have pipeline inlet pressure gauges which indicate the higher of either pipeline pressure, or machine circuit pressure (the ... specific circumstances lead to a delayed appreciation ...

Douglas B. Craig; John Longmuir

1980-09-01T23:59:59.000Z

325

Introduction The pressure transducer is commonly used in ground  

E-Print Network [OSTI]

to the gauges on the backside. This strain produces an electrical resistance change that is pro- portional is kept at atmospheric pressure via a small-diameter tube that runs inside the transducer cable for its full length, and is open to the atmosphere at its upper end. Manufacturers caution users to refrain

Loheide, Steve

326

Electrical Transport Experiments at High Pressure  

SciTech Connect (OSTI)

High-pressure electrical measurements have a long history of use in the study of materials under ultra-high pressures. In recent years, electrical transport experiments have played a key role in the study of many interesting high pressure phenomena including pressure-induced superconductivity, insulator-to-metal transitions, and quantum critical behavior. High-pressure electrical transport experiments also play an important function in geophysics and the study of the Earth's interior. Besides electrical conductivity measurements, electrical transport experiments also encompass techniques for the study of the optoelectronic and thermoelectric properties of materials under high pressures. In addition, electrical transport techniques, i.e., the ability to extend electrically conductive wires from outside instrumentation into the high pressure sample chamber have been utilized to perform other types of experiments as well, such as high-pressure magnetic susceptibility and de Haas-van Alphen Fermi surface experiments. Finally, electrical transport techniques have also been utilized for delivering significant amounts of electrical power to high pressure samples, for the purpose of performing high-pressure and -temperature experiments. Thus, not only do high-pressure electrical transport experiments provide much interesting and valuable data on the physical properties of materials extreme compression, but the underlying high-pressure electrical transport techniques can be used in a number of ways to develop additional diagnostic techniques and to advance high pressure capabilities.

Weir, S

2009-02-11T23:59:59.000Z

327

Microwave radiation by a relativistic electron beam propagation through low?pressure air  

Science Journals Connector (OSTI)

Intense relativistic electron beams fired into air at varying pressures display a wide range of microwave signatures. These experiments held beam current energy and pulse length constant while varying gas pressure. Our observing window is 10 to 40 GHz. At low pressures (generated plasma frequencies. Power falls linearly with pressure above 20 mTorr until electron?Neutral collisions damp the emission at a few Torr. However weak 10 GHz emission appears at full atmospheric pressure.

S. Jordan; A. Ben?Amar Baranga; G. Benford; D. Tzach; K. Kato

1985-01-01T23:59:59.000Z

328

Flash High-Pressure Condensate to Regenerate Low-Pressure Steam  

Broader source: Energy.gov [DOE]

This tip sheet outlines optimal conditions for flashing high-pressure condensate to regenerate low-pressure steam in steam systems.

329

Vaporization of bulk metals into single-digit nanoparticles by non-thermal plasma filaments in atmospheric pressure dielectric barrier discharges  

Science Journals Connector (OSTI)

Abstract A compact, inexpensive and simple dielectric barrier discharge (DBD) design is presented with related electro-thermal properties for the production of metal nanoparticles. Nanoparticle formation and growth mechanisms are depicted from size distributions and chemical analyses of particles collected just after the 70 kHz DBD in nitrogen. At first, it is confirmed that the initial local vapor flux is produced from the spots of interaction between plasma filaments and different metal electrodes (Au, Ag, and Cu). Amorphous and crystalline pure metal primary nanoparticles with diameters below 5 nm are then produced by physical nucleation in expanding vapors jets. Finally, some small agglomerates with diameters still below 5 nm are also formed by ballistic agglomeration of a fraction of these primary particles. This happens at the end of the vapor jet expansion, as well as after the production during the transit between subsequent filaments in the DBD. The first local agglomeration step can be limited at reduced energy per filament by lowering the initial vapor flux in smaller gaps, while the second growth step depends on the transit time in the DBD. Hence, such “low” energy plasma filaments (up to a few tens of µJ) lower the initial vapor flux to control the agglomeration. DBD were thus successfully tested for the production of tailored nanoparticles with tunable size, controlled morphology of spherical agglomerates and the same composition as the metal electrode. The production per unit energy (mol J?1) is related to both plasma and material properties. Besides, neglecting vapor and nanoparticles losses, the mass production rate (g s?1) depends on the input power related to the product of the energy controlling the production per filament times the number of filaments per second, for any given material. This non-thermal plasma process presents great potentialities for nano-technologies since it is performed at atmospheric pressure and can be used to reach size-dependent properties of nano-materials, without any gaseous precursor or solvent.

J.-P. Borra; N. Jidenko; J. Hou; A. Weber

2015-01-01T23:59:59.000Z

330

Liquid Sampling-Atmospheric Pressure Glow Discharge (LS-APGD) Ionization Source for Elemental Mass Spectrometry: Preliminary Parametric Evaluation and Figures of Merit  

SciTech Connect (OSTI)

A new, low power ionization source for the elemental analysis of aqueous solutions has recently been described. The liquid sampling-atmospheric pressure glow discharge (LS-APGD) source operates at relatively low currents (<20 mA) and solution flow rates (<50 ?L min-1), yielding a relatively simple alternative for atomic mass spectrometry applications. The LS-APGD has been interfaced to what is otherwise an organic, LC-MS mass analyzer, the Thermo Scientific Exactive Orbitrap without any modifications; other than removing the electrospray ionization (ESI) source supplied with that instrument. A glow discharge is initiated between the surface of the test solution exiting a glass capillary and a metallic counter electrode mounted at a 90° angle and separated by a distance of ~5 mm. As with any plasma-based ionization source, there are key discharge operation and ion sampling parameters that affect the intensity and composition of the derived mass spectra; including signal-to-background ratios. We describe here a preliminary parametric evaluation of the roles of discharge current, solution flow rate, argon sheath gas flow rate, and ion sampling distance as they apply on this mass analyzer system. A cursive evaluation of potential matrix effects due to the presence of easily ionized elements (EIEs) indicate that sodium concentrations of up to 500 ?g mL-1 generally cause suppressions of less than 50%, dependant upon the analyte species. Based on the results of this series of studies, preliminary limits of detection (LOD) have been established through the generation of calibration functions. Whilst solution-based concentrations LOD levels of 0.02 – 2 ?g mL-1 3 are not impressive on the surface, the fact that they are determined via discrete 5 ?L injections leads to mass-based detection limits at picogram to singlenanogram levels. The overhead costs associated with source operation (10 W d.c. power, solution flow rates of <50 ?L min-1, and gas flow rates <10 mL min-1) are very attractive. While further optimization in the source design is suggested here, it is believed that the LS-APGD ion source may present a practical alternative to inductively-coupled plasma (ICP) sources typically employed in elemental mass spectrometry.

Quarles, C. Derrick; Carado, Anthony J.; Barinaga, Charles J.; Koppenaal, David W.; Marcus, R. Kenneth

2012-01-01T23:59:59.000Z

331

High-Pressure Tube Trailers and Tanks  

Broader source: Energy.gov [DOE]

Presentation on High-Pressure Tube Trailers and Tanks for the DOE Hydrogen Delivery High-Pressure Tanks and Analysis Project Review Meeting held February 8-9, 2005 at Argonne National Laboratory

332

Managed pressure drilling techniques and tools  

E-Print Network [OSTI]

these problems, the economics of drilling the wells will improve, thus enabling the industry to drill wells that were previously uneconomical. Managed pressure drilling (MPD) is a new technology that enables a driller to more precisely control annular pressures...

Martin, Matthew Daniel

2006-08-16T23:59:59.000Z

333

International Hydrogen Fuel and Pressure Vessel Forum  

Broader source: Energy.gov [DOE]

The U.S. Department of Energy (DOE) and Tsinghua University in Beijing co-hosted the International Hydrogen Fuel and Pressure Vessel Forum on September 27–29, 2010 in Beijing, China. High pressure...

334

Air separation with temperature and pressure swing  

DOE Patents [OSTI]

A chemical absorbent air separation process is set forth which uses a temperature swing absorption-desorption cycle in combination with a pressure swing wherein the pressure is elevated in the desorption stage of the process.

Cassano, Anthony A. (Allentown, PA)

1986-01-01T23:59:59.000Z

335

Pressure Data: BOP Summary 28 May 2010  

Broader source: Energy.gov [DOE]

This is a schematic of the BOP stack with the static pressure data recoded on the 28th of May and shows pressures before and after the attempted top kill and junk shots.

336

Nanocomposite Flexible Pressure Sensor for Biomedical Applications  

E-Print Network [OSTI]

A new approach for the fabrication of flexible pressure sensors based on aligned carbon nanotubes (A-CNTs) is described in this paper. The technology is suitable for blood pressure sensors that can be attached to a stent-graft ...

Fachin, F.

337

Carbon nanotube temperature and pressure sensors  

DOE Patents [OSTI]

The present invention, in one embodiment, provides a method of measuring pressure or temperature using a sensor including a sensor element composed of a plurality of carbon nanotubes. In one example, the resistance of the plurality of carbon nanotubes is measured in response to the application of temperature or pressure. The changes in resistance are then recorded and correlated to temperature or pressure. In one embodiment, the present invention provides for independent measurement of pressure or temperature using the sensors disclosed herein.

Ivanov, Ilia N; Geohegan, David Bruce

2013-10-29T23:59:59.000Z

338

High pressure fiber optic sensor system  

DOE Patents [OSTI]

The present application provides a fiber optic sensor system. The fiber optic sensor system may include a small diameter bellows, a large diameter bellows, and a fiber optic pressure sensor attached to the small diameter bellows. Contraction of the large diameter bellows under an applied pressure may cause the small diameter bellows to expand such that the fiber optic pressure sensor may measure the applied pressure.

Guida, Renato; Xia, Hua; Lee, Boon K; Dekate, Sachin N

2013-11-26T23:59:59.000Z

339

Neutron scattering studies of materials under pressure  

Science Journals Connector (OSTI)

A review of experimental techniques used in the study of materials under applied pressure by neutron scattering is given along with a discussion of the amount of information that can be obtained from various pressure conditions. Some experimental results are presented to illustrate both the feasibility and the interest of elastic and inelastic neutron scattering measurements of materials under pressure.

C. Vettier

1982-01-01T23:59:59.000Z

340

Evaluation of anticipatory signal to steam generator pressure control program for 700 MWe Indian pressurized heavy water reactor  

SciTech Connect (OSTI)

700 MWe Indian Pressurized Heavy Water Reactor (IPHWR) is horizontal channel type reactor with partial boiling at channel outlet. Due to boiling, it has a large volume of vapor present in the primary loops. It has two primary loops connected with the help of pressurizer surge line. The pressurizer has a large capacity and is partly filled by liquid and partly by vapor. Large vapor volume improves compressibility of the system. During turbine trip or load rejection, pressure builds up in Steam Generator (SG). This leads to pressurization of Primary Heat Transport System (PHTS). To control pressurization of SG and PHTS, around 70% of the steam generated in SG is dumped into the condenser by opening Condenser Steam Dump Valves (CSDVs) and rest of the steam is released to the atmosphere by opening Atmospheric Steam Discharge Valves (ASDVs) immediately after sensing the event. This is accomplished by adding anticipatory signal to the output of SG pressure controller. Anticipatory signal is proportional to the thermal power of reactor and the proportionality constant is set so that SG pressure controller's output jacks up to ASDV opening range when operating at 100% FP. To simulate this behavior for 700 MWe IPHWR, Primary and secondary heat transport system is modeled. SG pressure control and other process control program have also been modeled to capture overall plant dynamics. Analysis has been carried out with 3-D neutron kinetics coupled thermal hydraulic computer code ATMIKA.T to evaluate the effect of the anticipatory signal on PHT pressure and over all plant dynamics during turbine trip in 700 MWe IPHWR. This paper brings out the results of the analysis with and without considering anticipatory signal in SG pressure control program during turbine trip. (authors)

Pahari, S.; Hajela, S.; Rammohan, H. P.; Malhotra, P. K.; Ghadge, S. G. [Nuclear Power Corporation of India Limited, Nabhikiya Urja Bhavan, Anushakti Nagar, Mumbai, PIN-400094 (India)

2012-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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

High-pressure microhydraulic actuator  

DOE Patents [OSTI]

Electrokinetic ("EK") pumps convert electric to mechanical work when an electric field exerts a body force on ions in the Debye layer of a fluid in a packed bed, which then viscously drags the fluid. Porous silica and polymer monoliths (2.5-mm O.D., and 6-mm to 10-mm length) having a narrow pore size distribution have been developed that are capable of large pressure gradients (250-500 psi/mm) when large electric fields (1000-1500 V/cm) are applied. Flowrates up to 200 .mu.L/min and delivery pressures up to 1200 psi have been demonstrated. Forces up to 5 lb-force at 0.5 mm/s (12 mW) have been demonstrated with a battery-powered DC-DC converter. Hydraulic power of 17 mW (900 psi@ 180 uL/min) has been demonstrated with wall-powered high voltage supplies. The force and stroke delivered by an actuator utilizing an EK pump are shown to exceed the output of solenoids, stepper motors, and DC motors of similar size, despite the low thermodynamic efficiency.

Mosier, Bruce P. (San Francisco, CA) [San Francisco, CA; Crocker, Robert W. (Fremont, CA) [Fremont, CA; Patel, Kamlesh D. (Dublin, CA) [Dublin, CA

2008-06-10T23:59:59.000Z

342

System for pressure letdown of abrasive slurries  

DOE Patents [OSTI]

A system and method for releasing erosive slurries from containment at high pressure without subjecting valves to highly erosive slurry flow. The system includes a pressure letdown tank disposed below the high-pressure tank, the two tanks being connected by a valved line communicating the gas phases and a line having a valve and choke for a transfer of liquid into the letdown tank. The letdown tank has a valved gas vent and a valved outlet line for release of liquid. In operation, the gas transfer line is opened to equalize pressure between tanks so that a low level of liquid flow occurs. The letdown tank is then vented, creating a high-pressure differential between the tanks. At this point, flow between tanks is controlled by the choke. High-velocity, erosive flow through a high-pressure outlet valve is prevented by equalizing the start up pressure and thereafter limiting flow with the choke.

Kasper, Stanley (Pittsburgh, PA)

1991-01-01T23:59:59.000Z

343

Passive tire pressure sensor and method  

DOE Patents [OSTI]

A surface acoustic wave device includes a micro-machined pressure transducer for monitoring tire pressure. The device is configured having a micro-machined cavity that is sealed with a flexible conductive membrane. When an external tire pressure equivalent to the cavity pressure is detected, the membrane makes contact with ridges on the backside of the surface acoustic wave device. The ridges are electrically connected to conductive fingers of the device. When the detected pressure is correct, selected fingers on the device will be grounded producing patterned acoustic reflections to an impulse RF signal. When the external tire pressure is less than the cavity reference pressure, a reduced reflected signal to the receiver results. The sensor may further be constructed so as to identify itself by a unique reflected identification pulse series.

Pfeifer, Kent Bryant (Los Lunas, NM); Williams, Robert Leslie (Albuquerque, NM); Waldschmidt, Robert Lee (Calgary, CA); Morgan, Catherine Hook (Ann Arbor, MI)

2007-09-04T23:59:59.000Z

344

Top Hat Pressure System Hyperbaric Test Analysis | Department...  

Broader source: Energy.gov (indexed) [DOE]

Top Hat Pressure System Hyperbaric Test Analysis Top Hat Pressure System Hyperbaric Test Analysis This file contains data from pressure measurements inside Top Hat 4....

345

Pressurized reactor system and a method of operating the same  

DOE Patents [OSTI]

A method and apparatus are provided for operating a pressurized reactor system in order to precisely control the temperature within a pressure vessel in order to minimize condensation of corrosive materials from gases on the surfaces of the pressure vessel or contained circulating fluidized bed reactor, and to prevent the temperature of the components from reaching a detrimentally high level, while at the same time allowing quick heating of the pressure vessel interior volume during start-up. Super-atmospheric pressure gas is introduced from the first conduit into the fluidized bed reactor and heat derived reactions such as combustion and gasification are maintained in the reactor. Gas is exhausted from the reactor and pressure vessel through a second conduit. Gas is circulated from one part of the inside volume to another to control the temperature of the inside volume, such as by passing the gas through an exterior conduit which has a heat exchanger, control valve, blower and compressor associated therewith, or by causing natural convection flow of circulating gas within one or more generally vertically extending gas passages entirely within the pressure vessel (and containing heat exchangers, flow rate control valves, or the like therein). Preferably, inert gas is provided as a circulating gas, and the inert gas may also be used in emergency shut-down situations. In emergency shut-down reaction gas being supplied to the reactor is cut off, while inert gas from the interior gas volume of the pressure vessel is introduced into the reactor. 2 figs.

Isaksson, J.M.

1996-06-18T23:59:59.000Z

346

High Pressure Hydrogen Tank Manufacturing  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Workshop Workshop High Pressure Hydrogen Tank Manufacturing Mark Leavitt Quantum Fuel Systems Technologies Worldwide, Inc. August 11, 2011 This presentation does not contain any proprietary, confidential, or otherwise restricted information History of Innovations... Announced breakthrough in all-composite lightweight, high capacity, low-cost fuel storage technologies. * Developed a series of robust, OEM compatible electronic control products. Developed H 2 storage system for SunLine Tran-sit Hythane® bus. Awarded patent for integrated module including in-tank regulator * Developed high efficiency H 2 fuel storage systems for DOE Future Truck programs Developed H 2 storage and metering system for Toyota's FCEV platform. First to certify 10,000 psi systems in Japan

347

Steam Gasification of Coal at Low?Medium (600?800 °C) Temperature with Simultaneous CO2 Capture in a Bubbling Fluidized Bed at Atmospheric Pressure. 2. Results and Recommendations for Scaling Up  

Science Journals Connector (OSTI)

Steam Gasification of Coal at Low?Medium (600?800 °C) Temperature with Simultaneous CO2 Capture in a Bubbling Fluidized Bed at Atmospheric Pressure. ... Once the existence of segregation in the bed of the gasifier with the particles' sizes used for coal and for the CaO in the preliminary tests are confirmed and analyzed, the particle size of the coal was increased to 0.4?2.0 ... In general small differences in d. readily lead to segregation while quite differently sized particles are fairly easily mixed. ...

Jose Corella; Jose M. Toledo; Gregorio Molina

2008-02-15T23:59:59.000Z

348

Portable high precision pressure transducer system  

DOE Patents [OSTI]

A high precision pressure transducer system is described for checking the reliability of a second pressure transducer system used to monitor the level of a fluid confined in a holding tank. Since the response of the pressure transducer is temperature sensitive, it is continually housed in an battery powered oven which is configured to provide a temperature stable environment at specified temperature for an extended period of time. Further, a high precision temperature stabilized oscillator and counter are coupled to a single board computer to accurately determine the pressure transducer oscillation frequency and convert it to an applied pressure. All of the components are powered by the batteries which during periods of availability of line power are charged by an on board battery charger. The pressure readings outputs are transmitted to a line printer and a vacuum fluorescent display. 2 figures.

Piper, T.C.; Morgan, J.P.; Marchant, N.J.; Bolton, S.M.

1994-04-26T23:59:59.000Z

349

Pressure maintenance in a volatile oil reservoir  

E-Print Network [OSTI]

reservoir. Historically, produced and makeup gas was injected to maintain pressure. In today's economy. gas has an increasing market value compared to the price of oil. Therefore, it becomes increasingly difficult to justify economically the injection... of produced gas and the purchase of additional make up gas to maintain reservoir pressure. Accordingly, water injection to maintain pressure becomes more favorable economically. This research investigated water injection into a volatile oil reservoir...

Schuster, Bruce Alan

2012-06-07T23:59:59.000Z

350

Dynamic pore pressure ahead of the bit  

SciTech Connect (OSTI)

An analytic approach is presented in an attempt to improve the understanding of the mechanism of pore-pressure invasion ahead of the bit during drilling. An axisymmetric model accounts for a zone of damaged permeability (skin) on the work front. The effect of rate of penetration (ROP) and rotation speed on the pore pressure at the depth of cut is significant in the lower range of permeabilities, while for the high permeabilities, the skin has an overwhelming control on the pressure invasion.

Peltier, B.; Atkinson, C.

1987-12-01T23:59:59.000Z

351

Electrical resistance of Evanohm under pressure  

Science Journals Connector (OSTI)

The electrical resistance of Evanohm wire has been determined as a function of hydrostatic pressure. A Teflon cell with a novel type of electrical feedthrough was used to contain the fluid medium. The resistance was found to decrease approximately linearly by 0.3% up to 27 kilobar. The remarkably small variation of its resistance with temperature and pressure makes Evanohm a suitable material for strain measurements under pressure.

P. Andersson; G. Bäckström

1975-01-01T23:59:59.000Z

352

Effect of pressure anisotropy on magnetorotational instability  

SciTech Connect (OSTI)

It is shown that two new instabilities of hybrid type can occur in a rotating magnetized plasma with anisotropic pressure, i.e., the rotational firehose instability and the rotational mirror instability. In the case of {beta}{sub parallel} > {beta}{sub perpendicular}, where {beta}{sub parallel} and {beta}{sub -perpendicular} are the ratios of the parallel and perpendicular plasma pressure to the magnetic field pressure, the pressure anisotropy tends to suppress both new instabilities; in the case {beta}{sub perpendicular} > {beta}{sub parallel}, it leads to their strengthening. In the latter case, the perturbations considered can be unstable even if the Velikhov instability criterion is not satisfied.

Mikhailovskii, A. B. [Russian Research Centre Kurchatov Institute, Institute of Nuclear Fusion (Russian Federation); Lominadze, J. G. [Georgian National Astrophysical Observatory (United States)], E-mail: j.lominadze@astro-ge.org; Churikov, A. P. [Syzran Branch of Samara Technical University (Russian Federation); Erokhin, N. N. [Russian Research Centre Kurchatov Institute, Institute of Nuclear Fusion (Russian Federation); Erokhin, N. S. [Russian Academy of Sciences, Space Research Institute (Russian Federation); Tsypin, V. S

2008-02-15T23:59:59.000Z

353

Viscosity of liquid Fe at high pressure  

Science Journals Connector (OSTI)

Synchrotron x-ray radiography has been used to measure the viscosity of pure liquid Fe at high pressure and temperature in a large volume press. A probe sphere rising through liquid Fe at high pressure and temperature is imaged, in situ, allowing for the derivation of sample viscosity through a modified form of Stokes’ equation. The effect of pressure on viscosity is fit by the semi empirical framework for transport coefficients in liquid metals, providing experimental verification of constant viscosity at the pressure-dependent melting temperature of liquid Fe where no change in liquid structure occurs.

Michael D. Rutter; Richard A. Secco; Hongjian Liu; Takeyuki Uchida; Mark L. Rivers; Stephen R. Sutton; Yanbin Wang

2002-08-14T23:59:59.000Z

354

Putting the pressure on carbon dioxide | EMSL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Putting the pressure on carbon dioxide Improving the chances for fuel recovery and carbon sequestration Artwork from this research graces the cover of Environmental Science...

355

High-Pressure Tube Trailers and Tanks  

Broader source: Energy.gov (indexed) [DOE]

bending stress: continuous fiber vessels and vessels made of replicants Conformable tanks require internal stiffeners (ribs) to efficiently support the pressure and minimize...

356

Alternative Strategies for Low Pressure End Uses  

Broader source: Energy.gov [DOE]

This tip sheet outlines alternative strategies for low-pressure end uses as a pathway to reduced compressed air energy costs.

357

Conceptual Design for Pressure Swing Distillation.  

E-Print Network [OSTI]

??The separation of homogenous azeotropic mixtures is a common task in the chemical industry. In the literature, pressure swing distillation is often mentioned as an… (more)

Bozzacco, Carmen

2006-01-01T23:59:59.000Z

358

Geothermal: Sponsored by OSTI -- Reservoir Pressure Management  

Office of Scientific and Technical Information (OSTI)

Reservoir Pressure Management Geothermal Technologies Legacy Collection HelpFAQ | Site Map | Contact Us | Admin Log On HomeBasic Search About Publications Advanced Search New Hot...

359

Documentation Requirements for Pressurized Experiment Equipment  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

complexity of the system. 1. Description of apparatus a. Description of the assembly and operation of the system. b. State the maximum working pressure, working fluid (liquid or...

360

Heating tar sands formations while controlling pressure  

DOE Patents [OSTI]

Methods for treating a tar sands formation are described herein. Methods may include heating at least a section of a hydrocarbon layer in the formation from a plurality of heaters located in the formation. A pressure in the majority of the section may be maintained below a fracture pressure of the formation. The pressure in the majority of the section may be reduced to a selected pressure after the average temperature reaches a temperature that is above 240.degree. C. and is at or below pyrolysis temperatures of hydrocarbons in the section. At least some hydrocarbon fluids may be produced from the formation.

Stegemeier, George Leo (Houston, TX) [Houston, TX; Beer, Gary Lee (Houston, TX) [Houston, TX; Zhang, Etuan (Houston, TX) [Houston, TX

2010-01-12T23:59:59.000Z

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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

Effects of Hyperbaric Pressure on a Deep-Sea Archaebacterium in Stainless Steel and Glass-Lined Vessels  

Science Journals Connector (OSTI)

...syringe and the pressure generator provides ballast to...turn of the pressure generator. As with gas sam...these experiments, water was used as the pressurizing...microorganisms from water and sediment samples...subsequent incuba- tion at atmospheric pressure. In our experiments...

Chad M. Nelson; Michael R. Schuppenhauer; Douglas S. Clark

1991-12-01T23:59:59.000Z

362

Apparatus for unloading pressurized fluid  

DOE Patents [OSTI]

An apparatus is described for unloading fluid, preferably pressurized gas, from containers in a controlled manner that protects the immediate area from exposure to the container contents. The device consists of an unloading housing, which is enclosed within at least one protective structure, for receiving the dispensed contents of the steel container, and a laser light source, located external to the protective structure, for opening the steel container instantaneously. The neck or stem of the fluid container is placed within the sealed interior environment of the unloading housing. The laser light passes through both the protective structure and the unloading housing to instantaneously pierce a small hole within the stem of the container. Both the protective structure and the unloading housing are specially designed to allow laser light passage without compromising the light's energy level. Also, the unloading housing allows controlled flow of the gas once it has been dispensed from the container. The external light source permits remote operation of the unloading device. 2 figures.

Rehberger, K.M.

1994-01-04T23:59:59.000Z

363

Pressure analysis for horizontal wells  

SciTech Connect (OSTI)

This paper presents horizontal-well test design and interpretation methods. Analytical solutions are developed that can be handled easily by a desktop computer to carry out design as well as interpretation with semilog and log-log analysis. These analytical solutions point out the distinctive behavior of horizontal wells: (1) at early time, there is a circular radial flow in a vertical plane perpendicular to the well, and (2) at late time, there is a horizontal pseudoradial flow. Each type of flow is associated with a semilog straight line to which semilog analysis has to be adapted. The horizontal pseudoradial flow takes into account a pseudoskin depending on system geometry, which is a priori defined and estimated. Practical time criteria are proposed to determine the beginning and the end of each type of flow and to provide a guide to semilog analysis and well test design. The authors study the behavior of uniform-flux or infinite-conductivity horizontal wells, with wellbore storage and skin. The homogeneous reservoir is infinite or limited by impermeable or constant-pressure boundaries. A method is also outlined to transform all our solutions for homogeneous reservoirs into corresponding solutions for double-porosity reservoirs.

Davlau, F.; Mouronval, G.; Bourdarot, G.; Curutchet, P.

1988-12-01T23:59:59.000Z

364

Lightweight bladder lined pressure vessels  

DOE Patents [OSTI]

A lightweight, low permeability liner for graphite epoxy composite compressed gas storage vessels. The liner is composed of polymers that may or may not be coated with a thin layer of a low permeability material, such as silver, gold, or aluminum, deposited on a thin polymeric layer or substrate which is formed into a closed bladder using torispherical or near torispherical end caps, with or without bosses therein, about which a high strength to weight material, such as graphite epoxy composite shell, is formed to withstand the storage pressure forces. The polymeric substrate may be laminated on one or both sides with additional layers of polymeric film. The liner may be formed to a desired configuration using a dissolvable mandrel or by inflation techniques and the edges of the film seamed by heat sealing. The liner may be utilized in most any type of gas storage system, and is particularly applicable for hydrogen, gas mixtures, and oxygen used for vehicles, fuel cells or regenerative fuel cell applications, high altitude solar powered aircraft, hybrid energy storage/propulsion systems, and lunar/Mars space applications, and other applications requiring high cycle life.

Mitlitsky, Fred (1125 Canton Ave., Livermore, CA 94550); Myers, Blake (4650 Almond Cir., Livermore, CA 94550); Magnotta, Frank (1206 Bacon Way, Lafayette, CA 94549)

1998-01-01T23:59:59.000Z

365

Lightweight bladder lined pressure vessels  

DOE Patents [OSTI]

A lightweight, low permeability liner is described for graphite epoxy composite compressed gas storage vessels. The liner is composed of polymers that may or may not be coated with a thin layer of a low permeability material, such as silver, gold, or aluminum, deposited on a thin polymeric layer or substrate which is formed into a closed bladder using tori spherical or near tori spherical end caps, with or without bosses therein, about which a high strength to weight material, such as graphite epoxy composite shell, is formed to withstand the storage pressure forces. The polymeric substrate may be laminated on one or both sides with additional layers of polymeric film. The liner may be formed to a desired configuration using a dissolvable mandrel or by inflation techniques and the edges of the film sealed by heat sealing. The liner may be utilized in most any type of gas storage system, and is particularly applicable for hydrogen, gas mixtures, and oxygen used for vehicles, fuel cells or regenerative fuel cell applications, high altitude solar powered aircraft, hybrid energy storage/propulsion systems, and lunar/Mars space applications, and other applications requiring high cycle life. 19 figs.

Mitlitsky, F.; Myers, B.; Magnotta, F.

1998-08-25T23:59:59.000Z

366

Temperature measurement of an atmospheric pressure arc discharge plasma jet using the diatomic CN (B {sup 2}{sigma}{sup +}-X {sup 2}{sigma}{sup +}, violet system) molecular spectra  

SciTech Connect (OSTI)

The CN (B {sup 2}{sigma}{sup +}-X {sup 2}{sigma}{sup +}) molecular emission spectrum is used to measure both the vibrational and rotational temperatures in atmospheric pressure arc jet discharges. The vibrational and rotational temperature effects on the synthetic diatomic molecular spectra were investigated from the (v{sup '},v{sup ''})=(0,0) band to the (5,5) band. The temperatures obtained from the synthetic spectra compared with the experimental result of a low-frequency arc discharge show a vibrational temperature of (4250-5010) K and a rotational temperature of (3760-3980) K for the input power in the range of (80-280) W. As the (0,0) band is isolated from other vibrational transition bands, determination of the rotational temperature is possible based only on the (0,0) band, which simplifies the temperature measurement. From the result, it was found that the CN molecular spectrum can be used as a thermometer for atmospheric pressure plasmas containing carbon and nitrogen.

Moon, Se Youn; Kim, D. B.; Gweon, B.; Choe, W. [Department of Physics, Korea Advanced Institute of Science and Technology, 335 Gwahangno, Yuseong-gu, Daejeon 305-701 (Korea, Republic of)

2009-03-01T23:59:59.000Z

367

Spectroscopic measurement of the vapour pressure of ice  

Science Journals Connector (OSTI)

...Murphy Meeting Issue Water in the gas phase . We...triple-point state of water and uses frequency-stabilized...temperature-regulated standard humidity generator, which contains ice...within 0.35 per cent. water vapour|ice vapour pressure...technical fields. In atmospheric physics, ice crystals...

2012-01-01T23:59:59.000Z

368

Principal stress pore pressure prediction: utilizing drilling measurements to predict pore pressure  

E-Print Network [OSTI]

A novel method of predicting pore pressure has been invented. The method utilizes currently recorded drilling measurements to predict the pore pressure of the formation through which the bit is drilling. The method applies Mohr’s Theory to describe...

Richardson, Kyle Wade

2009-05-15T23:59:59.000Z

369

Thermal expansion of Mg(OH)2 brucite under high pressure and pressure dependence of entropy  

Science Journals Connector (OSTI)

An equation of state for Mg(OH)2 brucite under high-pressure and high-temperature conditions ... -ray diffraction. Pressure dependence of entropy of brucite has been calculated with thermal expansion coefficient....

H. Fukui; O. Ohtaka; T. Suzuki; K. Funakoshi

2003-10-01T23:59:59.000Z

370

Statistics of pressure and of pressure-velocity correlations in isotropic turbulence  

E-Print Network [OSTI]

Some pressure and pressure-velocity correlation in a direct numerical simulations of a three-dimensional turbulent flow at moderate Reynolds numbers have been analyzed. We have identified a set of pressure-velocity correlations which posseses a good scaling behaviour. Such a class of pressure-velocity correlations are determined by looking at the energy-balance across any sub-volume of the flow. According to our analysis, pressure scaling is determined by the dimensional assumption that pressure behaves as a ``velocity squared'', unless finite-Reynolds effects are overwhelming. The SO(3) decompositions of pressure structure functions has also been applied in order to investigate anisotropic effects on the pressure scaling.

L. Biferale; P. Gualtieri; F. Toschi

2000-01-17T23:59:59.000Z

371

ADAPTIVE ROBUST TRACKING CONTROL OF PRESSURE  

E-Print Network [OSTI]

accuracy of pressure trajectory in the chamber when the pneumatic cylinder is moving. Off-line fitting, it is necessary to utilize the adaptive model compensation for improving the tracking accuracy of pressure and attenuation in pneumatic lines, valve dynamics, flow nonlinearities through the valve orifice, piston friction

Yao, Bin

372

Superconducting high-pressure phases of disilane  

Science Journals Connector (OSTI)

...Superconducting high-pressure phases of disilane 10.1073/pnas.1005242107 Xilian...DC 20015 High-pressure structures of disilane (Si2H6) are investigated extensively...linear-response calculations for Pm-3m disilane at 275 GPa show a large electron-phonon...

Xilian Jin; Xing Meng; Zhi He; Yanming Ma; Bingbing Liu; Tian Cui; Guangtian Zou; Ho-kwang Mao

2010-01-01T23:59:59.000Z

373

NETL- High-Pressure Combustion Research Facility  

SciTech Connect (OSTI)

NETL's High-Pressure Combustion Facility is a unique resource within the National Laboratories system. It provides the test capabilities needed to evaluate new combustion concepts for high-pressure, high-temperature hydrogen and natural gas turbines. These concepts will be critical for the next generation of ultra clean, ultra efficient power systems.

None

2013-07-08T23:59:59.000Z

374

September 25, 2006 Experimental pressure solution compaction  

E-Print Network [OSTI]

September 25, 2006 Experimental pressure solution compaction of synthetic halite/calcite aggregates by addition of hard particles. Sieved mixtures of calcite and halite grains are experimentally compacted in drained pressure cells in the presence of a saturated aqueous solution. The individual halite grains

Paris-Sud XI, Université de

375

NETL- High-Pressure Combustion Research Facility  

ScienceCinema (OSTI)

NETL's High-Pressure Combustion Facility is a unique resource within the National Laboratories system. It provides the test capabilities needed to evaluate new combustion concepts for high-pressure, high-temperature hydrogen and natural gas turbines. These concepts will be critical for the next generation of ultra clean, ultra efficient power systems.

None

2014-06-26T23:59:59.000Z

376

Pressure Temperature Log | Open Energy Information  

Open Energy Info (EERE)

Page Page Edit with form History Facebook icon Twitter icon » Pressure Temperature Log Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Pressure Temperature Log Details Activities (13) Areas (13) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Log Techniques Parent Exploration Technique: Well Log Techniques Information Provided by Technique Lithology: Stratigraphic/Structural: Perturbations in temperature or pressure can be indicative of faults or other structural features Hydrological: fluid cirulation, over-pressured zones, and under-pressured zones. Thermal: Temperature profile with depth Cost Information Low-End Estimate (USD): 0.6060 centUSD 6.0e-4 kUSD

377

Field measurement of lateral earth pressures on retaining walls  

E-Print Network [OSTI]

. The measured pressures are compared with the computed Coulomb and Rankine pressures for the active case. The measured pressures on the cantilever wall are in close agreement with the theoretical pressures on the upper half of the wall, but the measured... Pressure Variance with Time and Temperature. INTRODUCTION Present Status of the Question -- The latera1 earth pressure theories developed by Coulomb in 1776 and Rankine in 1S57 are known as the classical earth pressure theories (5)*. The basic equation...

Riggins, Michael

2012-06-07T23:59:59.000Z

378

Initiation Pressure Thresholds from Three Sources  

SciTech Connect (OSTI)

Pressure thresholds are minimum pressures needed to start explosive initiation that ends in detonation. We obtain pressure thresholds from three sources. Run-to-detonation times are the poorest source but the fitting of a function gives rough results. Flyer-induced initiation gives the best results because the initial conditions are the best known. However, very thick flyers are needed to give the lowest, asymptotic pressure thresholds used in modern models and this kind of data is rarely available. Gap test data is in much larger supply but the various test sizes and materials are confusing. We find that explosive pressures are almost the same if the distance in the gap test spacers are in units of donor explosive radius. Calculated half-width time pulses in the spacers may be used to create a pressure-time curve similar to that of the flyers. The very-large Eglin gap tests give asymptotic thresholds comparable to extrapolated flyer results. The three sources are assembled into a much-expanded set of near-asymptotic pressure thresholds. These thresholds vary greatly with density: for TATB/LX-17/PBX 9502, we find values of 4.9 and 8.7 GPa at 1.80 and 1.90 g/cm{sup 3}, respectively.

Souers, P C; Vitello, P

2007-02-28T23:59:59.000Z

379

Pressure Safety Program Implementation at ORNL  

SciTech Connect (OSTI)

The Oak Ridge National Laboratory (ORNL) is a US Department of Energy (DOE) facility that is managed by UT-Battelle, LLC. In February 2006, DOE promulgated worker safety and health regulations to govern contractor activities at DOE sites. These regulations, which are provided in 10 CFR 851, Worker Safety and Health Program, establish requirements for worker safety and health program that reduce or prevent occupational injuries, illnesses, and accidental losses by providing DOE contractors and their workers with safe and healthful workplaces at DOE sites. The regulations state that contractors must achieve compliance no later than May 25, 2007. According to 10 CFR 851, Subpart C, Specific Program Requirements, contractors must have a structured approach to their worker safety and health programs that at a minimum includes provisions for pressure safety. In implementing the structured approach for pressure safety, contractors must establish safety policies and procedures to ensure that pressure systems are designed, fabricated, tested, inspected, maintained, repaired, and operated by trained, qualified personnel in accordance with applicable sound engineering principles. In addition, contractors must ensure that all pressure vessels, boilers, air receivers, and supporting piping systems conform to (1) applicable American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (2004) Sections I through XII, including applicable code cases; (2) applicable ASME B31 piping codes; and (3) the strictest applicable state and local codes. When national consensus codes are not applicable because of pressure range, vessel geometry, use of special materials, etc., contractors must implement measures to provide equivalent protection and ensure a level of safety greater than or equal to the level of protection afforded by the ASME or applicable state or local codes. This report documents the work performed to address legacy pressure vessel deficiencies and comply with pressure safety requirements in 10 CFR 851. It also describes actions taken to develop and implement ORNL’s Pressure Safety Program.

Lower, Mark [ORNL; Etheridge, Tom [ORNL; Oland, C. Barry [XCEL Engineering, Inc.

2013-01-01T23:59:59.000Z

380

ASME post construction pressure technology codes  

SciTech Connect (OSTI)

The need to continue to operate pressurized equipment and other facilities in a safe, reliable and cost effective manner has led to the development of many new approaches to in-service inspection, flaw evaluation, and repair. Interest on the part of users, regulatory authorities and others in standardizing these approaches has led to the formation of a new ASME Main Committee on Post Construction under the Board on Pressure Technology Codes and Standards, and a new Division of the Pressure Vessel Research Council on Continued Operation of Equipment. This paper provides a brief overview of these activities.

Sims, J.R. [Exxon Research and Engineering Co., Florham Park, NJ (United States)

1996-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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

Pressurized security barrier and alarm system  

DOE Patents [OSTI]

A security barrier for placement across a passageway is made up of interconnected pressurized tubing made up in a grid pattern with openings too small to allow passage. The tubing is connected to a pressure switch, located away from the barrier site, which activates an alarm upon occurrence of a pressure drop. A reinforcing bar is located inside and along the length of the tubing so as to cause the tubing to rupture and set off the alarm upon an intruder`s making an attempt to crimp and seal off a portion of the tubing by application of a hydraulic tool. Radial and rectangular grid patterns are disclosed. 7 figures.

Carver, D.W.

1995-04-11T23:59:59.000Z

382

Pipeline gas pressure reduction with refrigeration generation  

SciTech Connect (OSTI)

The high pressure of pipeline gas is reduced to the low pressure of a distribution system with simultaneous generation of refrigeration by passing the gas through two successive centrifugal compressors driven by two turbo-expanders in which the compressed gas is expanded to successively lower pressures. Refrigeration is recovered from the gas as it leaves each turbo-expander. Methanol is injected into the pipeline gas before it is expanded to prevent ice formation. Aqueous methanol condensate separated from the expanded gas is distilled for the recovery and reuse of methanol.

Markbreiter, S. J.; Schorr, H. P.

1985-06-11T23:59:59.000Z

383

Steam gasification of coal at low-medium (600-800{sup o}C) temperature with simultaneous CO{sub 2} capture in fluidized bed at atmospheric pressure: The effect of inorganic species. 1. Literature review and comments  

SciTech Connect (OSTI)

This paper addresses the H{sub 2} production with simultaneous CO{sub 2} capture by steam gasification of coal in a fluidized bed, at low/medium temperatures (600-800{sup o}C) and atmospheric pressure. This work is mainly aimed at reviewing the effects of the inorganic species present in the matrix of the coal or added to the gasifier bed. The most promising species seems to be the calcined limestone (CaO), which intervenes in the overall gasification reaction network in at least five different types of reactions. The effectiveness of the CaO for CO{sub 2} capture in the coal gasifier is, therefore, affected/influenced by the other four simultaneous or competitive types of reactions in the gasifier. The effects of the temperature in the gasifier and of the (CaO/coal) ratio fed to the gasifier are finally reviewed and discussed in detail.

Corella, J.; Toledo, J.M.; Molina, G. [Universidad Complutense de Madrid, Madrid (Spain). Dept. for Chemical Engineering

2006-08-30T23:59:59.000Z

384

Documentation Requirements for Pressurized Experiment Equipment  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Documentation Requirements for Pressurized Experiment Apparatus Documentation Requirements for Pressurized Experiment Apparatus PSSC NOTE01 15-Jan-2013 When bringing a piece of apparatus to the APS for an experiment that will involve pressure, whether it is to be used on a beamline during a measurement or in a laboratory to prepare the sample prior to the experiment, the hazards associated with the equipment must be reviewed. To review the equipment and make any recommendations, a certain level of documentation must be provided by the experimenter. The length and depth of the documentation should be commensurate with the complexity of the system. 1. Description of apparatus a. Description of the assembly and operation of the system. b. State the maximum working pressure, working fluid (liquid or gas) used to

385

Effect of pressure anisotropy on magnetorotational instability  

SciTech Connect (OSTI)

It is shown that two new instabilities of hybrid type can occur in a rotating magnetized plasma with anisotropic pressure, i.e., the rotational firehose instability and the rotational mirror instability. In the case of {beta}{sub Parallel-To} > {beta}{sub Up-Tack }, where {beta}{sub Parallel-To} and {beta}{sub Up-Tack} are the ratios of the parallel and perpendicular plasma pressure to the magnetic field pressure, the pressure anisotropy tends to suppress both new instabilities; in the case {beta}{sub Up-Tack} > {beta}{sub Parallel-To }, it leads to their strengthening. In the latter case, the perturbations considered can be unstable even if the Velikhov instability criterion is not satisfied.

Mikhailovskii, A. B. [Russian Research Centre Kurchatov Institute, Institute of Nuclear Fusion (Russian Federation); Lominadze, J. G., E-mail: j.lominadze@astro-ge.org [Georgian National Astrophysical Observatory (United States); Churikov, A. P. [Syzran Branch of Samara Technical University (Russian Federation); Erokhin, N. N. [Russian Research Centre Kurchatov Institute, Institute of Nuclear Fusion (Russian Federation); Erokhin, N. S. [Russian Academy of Sciences, Space Research Institute (Russian Federation); Tsypin, V. S.

2008-02-15T23:59:59.000Z

386

CRAD, Pressurized Systems and Cryogens Assessment Plan  

Broader source: Energy.gov [DOE]

Assure personnel health and safety through regularly scheduled inspections and maintenance on pressure vessels and equipment, compressed gases and gas cylinders, vacuum equipment and systems, hydraulics, and cryogenic materials and systems.

387

Wind pressure distribution on shell structures  

E-Print Network [OSTI]

relates to both cost and safety. This study has revealed that wind pressure criteria for shell structures is not adequately covered by most building codes. Those that do exist are rather vague and sometimes erroneous. One recently published design manual...

Yancey, Kenneth Earl, Jr

1963-01-01T23:59:59.000Z

388

Pulse Pressure Forming of Lightweight Materials, Development...  

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

Merit Review and Peer Evaluation Meeting, June 7-11, 2010 -- Washington D.C. lm015smith2010o.pdf More Documents & Publications Pulse-Pressure Forming of Lightweight Metals...

389

Program predicts two-phase pressure gradients  

SciTech Connect (OSTI)

The calculator program discussed, ORK, was designed for the HP-41CV hand-held calculator and uses the Orkiszewski correlation for predicting 2-phase pressure gradients in vertical tubulars. Accurate predictions of pressure gradients in flowing and gas lift wells over a wide range of well conditions can be obtained with this method, which was developed based on data from 148 wells. The correlation is one of the best generalized 2-phase pressure gradient prediction methods developed to date for vertical flow. It is unique in that hold-up is derived from observed physical phenomena, and the pressure gradient is related to the geometrical distribution of the liquid and gas phase (flow regime).

Jacks, D.C.; Hill, A.D.

1983-11-18T23:59:59.000Z

390

Nanoprobe measurements of materials at megabar pressures  

Science Journals Connector (OSTI)

...Photon Science, SLAC National Accelerator Laboratory, 2575 Sand Hill...Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA...low-pressure, if not a near-vacuum, environment, which is incompatible...Department of Energy, National Nuclear Security Administration...

Lin Wang; Yang Ding; Wenge Yang; Wenjun Liu; Zhonghou Cai; Jennifer Kung; Jinfu Shu; Russell J. Hemley; Wendy L. Mao; Ho-kwang Mao

2010-01-01T23:59:59.000Z

391

Pressure swing adsorption with intermediate product recovery  

SciTech Connect (OSTI)

A pressure swing adsorption process is used to achieve intermediate product recovery by the introduction of a gas displacement step before, simultaneous with or subsequent to pressure equalization between beds of a multi-bed adsorption system. A cocurrent depressurization step is then employed to achieve intermediate product recovery. A portion of said intermediate product or of the more readily adsorbable component recovered from a bed advantageously being employed to provide displacement gas for another bed in the adsorption system.

Fuderer, A.

1985-04-23T23:59:59.000Z

392

PRESSURE OSCILLATION IN RHIC CRYOGENIC SYSTEM.  

SciTech Connect (OSTI)

HORIZONTAL BEAM VIBRATION AROUND 10HZ IN THE RELATIVISTIC HEAVY ION COLLIDER (RHIC) HAVE BEEN IDENTIFIED AND THE POSSIBLE SOURCES TO CAUSE THIS VIBRATION HAVE BEEN INVESTIGATED. TO DETERMINE THE HETIUM PRESSURE OSCILLATIONS AS A POSSIBLE PRIMARY VIBRATION SOURCE, HELIUM PRESSURE MEASUREMENTS WERE CARRIED OUT IN THE FIVE CRYOGENIC TRANSFER LINES AT 2 VALVE BOXES AND 6 LEAD PORTS AT 2 TRIPLET CRYOSTAT FOR BOTH MAGNET RINGS. ADDITIONALLY, COLD MA...

JIA,L.MONTAG,C.TALLERICO,T.HIRZEL,W.NICOLETTI,A.

2003-09-22T23:59:59.000Z

393

Dynamic surge/swab pressure predictions  

SciTech Connect (OSTI)

It is generally accepted that the pulling and running of pipe causes pressure surges. The prediction of pressure surges is of economic importance in wells where the pressure must be examined within narrow limits to prevent lost circulation and formation-fluid influx. For these wells, the drilling engineer needs the best possible method of calculating surge pressures to drill wells with a minimum of trouble. This paper presents a dynamic surge/swab model that extends existing technology with the following features: (1) pipe and annulus pressures are coupled through the pipe elasticity; (2) longitudinal pipe elasticity and fluid viscous forces determine pipe displacement; (3) fluid properties vary as a function of temperature and pressure; and (4) formation elasticity; pipe elasticity, and cement elasticity are all used to determine the composite elastic response of the wellbore. Comparisons between the model and field data demonstrate good agreement. Data matches have been made for both water- and oil-based muds in both shallow and deep wells. Furthermore, the model matches data that had not been previously matched by other models.

Mitchell, R.F. (Enertech Engineering and Research (US))

1988-09-01T23:59:59.000Z

394

Steam Pressure Reduction, Opportunities, and Issues  

SciTech Connect (OSTI)

Steam pressure reduction has the potential to reduce fuel consumption for a minimum capital investment. When the pressure at the boiler is reduced, fuel and steam are saved as a result of changes in the high-pressure side of the steam system from the boiler through the condensate return system. In the boiler plant, losses from combustion, boiler blowdown, radiation, and steam venting from condensate receivers would be reduced by reducing steam pressure. Similarly, in the steam distribution system, losses from radiation, flash steam vented from condensate receivers, and component and steam trap leakage would also be reduced. There are potential problems associated with steam pressure reduction, however. These may include increased boiler carryover, boiler water circulation problems in watertube boilers, increased steam velocity in piping, loss of power in steam turbines, and issues with pressure reducing valves. This paper is based a Steam Technical Brief sponsored by the U.S. Department of Energy (DOE) Office of Energy Efficiency and Renewable Energy and Enbridge Gas Distribution, Inc. (5). An example illustrates the use of DOE BestPractices Steam System Assessment Tool to model changes in steam, fuel, electricity generation, and makeup water and to estimate resulting economic benefits.

Berry, Jan [ORNL; Griffin, Mr. Bob [Enbridge Gas Distribution, Inc.; Wright, Anthony L [ORNL

2006-01-01T23:59:59.000Z

395

Design and fabrication of pressure-compensating compliant tubes  

E-Print Network [OSTI]

Different fabrication methods are evaluated for producing pressure-compensating tubes for use in low-pressure drip irrigation systems. Such devices would allow drip irrigation systems to operate at driving pressures much ...

Martin, Ian (Ian P.)

2014-01-01T23:59:59.000Z

396

Three precision differential pressure indicators for operation at high temperatures and pressures  

E-Print Network [OSTI]

, the design did have a 7 Pa sensitivity which is especially imoortant as the sensing transformer was located outside the pressure containment. This feature eliminates the need for electrical feedthroughs which usually limit the operating conditions... was constructed and the sensitivity increased to ? 5 -1 2x10 Pa using the same transformer. Based on the designs tested, a new differential pressure indicator was proposed. Using a diaphragm with a linear variable differential transformer outside the pressure...

Osburn, Douglas Clayton

1981-01-01T23:59:59.000Z

397

Apparatus and method for pressure testing closure disks  

DOE Patents [OSTI]

A method and device are described for testing the burst pressure of closure disks which provides high pressure to both sides of a disk and rapidly releases pressure from one side thereof causing a high rate of change of pressure. A hollow notched plug allows the rapid release of pressure upon rupturing. A tensile load is transmitted by a piston in combination with fluid pressure to the hollow notched plug. 5 figs.

Merten, C.W. Jr.

1992-01-21T23:59:59.000Z

398

Optimization of Pressurized Oxy4Combustion with Flameless Reactor  

SciTech Connect (OSTI)

Pressurized OxyECombustion is one of the most promising technologies for utilityEscale power generation plants. Benefits include the ability to burn low rank coal and capture C02. By increasing the flue gas pressure during this process, greater efficiencies are derived from increased quantity and quality of thermal energy recovery. UPA with modeling support from MIT and testing and data verification by Georgia Tech’s Research Center designed and built a 100kW system capable of demonstrating pressurized oxyEcombustion using a flameless combustor. Wyoming PRB coal was run at 15 and 32 bar. Additional tests were not completed but sampled data demonstrated the viability of the technology over a broader range of operating pressures, Modeling results illustrated a flat efficiency curve over 20 bar, with optimum efficiency achieved at 29 bar. This resulted in a 33% (HHV) efficiency, a 5 points increase in efficiency versus atmospheric oxyEcombustion, and a competitive cost of electricity plus greater C02 avoidance costs then prior study’s presented. UPA’s operation of the benchEscale system provided evidence that key performance targets were achieved: flue gas sampled at the combustor outlet had nonE detectable residual fly ashes, and low levels of SO3 and heavyEmetal. These results correspond to prior pressurized oxyEcombustion testing completed by IteaEEnel.

Malavasi, Massimo; Landegger, Gregory

2014-06-30T23:59:59.000Z

399

A Compact Pressure-Insulated Electrostatic X-Ray Generator  

Science Journals Connector (OSTI)

A compact, pressure-insulated, electrostatic x-ray generator has been developed for scientific and medical purposes. A major object of the work was the investigation, with a small and thus flexible machine, of the principles and design factors involved in pressure-insulated electrostatic generators with a view to the subsequent development of higher voltages in compact apparatus. The generator is housed in a steel tank 34 in. in diameter and 100 in. high. At air pressures of 11 atmospheres absolute, 1250-kv x-rays are obtained with target currents of over one milliampere supplied by the single 14-in. belt. With Freon gas the same voltages and currents can be obtained at one-third the pressure required with air. The problem of belt charge is analyzed and a method is described for controlling the electrostatic fields within the column in order to realize the high charge densities possible at high pressure. The construction of a supporting column of high breakdown strength, and other features of the design are described. At 1250 kv the x-ray intensity per milliampere of target current is about 340 roentgens per minute at 50 cm from the target in the direction of the electron beam with five mm of lead equivalent filtration.

John G. Trump and R. J. van de Graaff

1939-06-15T23:59:59.000Z

400

Bonfire Tests of High Pressure Hydrogen Storage Tanks | Department...  

Broader source: Energy.gov (indexed) [DOE]

Bonfire Tests of High Pressure Hydrogen Storage Tanks Bonfire Tests of High Pressure Hydrogen Storage Tanks These slides were presented at the International Hydrogen Fuel and...

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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

Bonfire Tests of High Pressure Hydrogen Storage Tanks  

Broader source: Energy.gov (indexed) [DOE]

Bonfire Tests of High Pressure Hydrogen Storage Tanks International Hydrogen Fuel and Pressure Vessel Forum 2010Beijing, P.R. China September 27, 2010 Bonfire Tests of High...

402

Ultralight Pressure Regulator for Application in Pneumatic Prostheses:.  

E-Print Network [OSTI]

??Available pressure regulators are considered too heavy for application in pneumatic prostheses. Goal of this paper is developing a lighter pressure regulator adapted for this… (more)

Rob, J.

2012-01-01T23:59:59.000Z

403

International Hydrogen Fuel and Pressure Vessel Forum 2010 Proceedings...  

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

International Hydrogen Fuel and Pressure Vessel Forum 2010 Proceedings International Hydrogen Fuel and Pressure Vessel Forum 2010 Proceedings Proceedings from the forum, which took...

404

Pressure Temperature Log At Glass Buttes Area (DOE GTP) | Open...  

Open Energy Info (EERE)

Pressure Temperature Log At Glass Buttes Area (DOE GTP) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Pressure Temperature Log At Glass Buttes...

405

HIGH PRESSURE COAL COMBUSTON KINETICS PROJECT  

SciTech Connect (OSTI)

As part of the U.S. Department of Energy (DoE) initiative to improve the efficiency of coal-fired power plants and reduce the pollution generated by these facilities, DOE has funded the High-Pressure Coal Combustion Kinetics (HPCCK) Projects. A series of laboratory experiments were conducted on selected pulverized coals at elevated pressures with the specific goals to provide new data for pressurized coal combustion that will help extend to high pressure and validate models for burnout, pollutant formation, and generate samples of solid combustion products for analyses to fill crucial gaps in knowledge of char morphology and fly ash formation. Two series of high-pressure coal combustion experiments were performed using SRI's pressurized radiant coal flow reactor. The first series of tests characterized the near burner flame zone (NBFZ). Three coals were tested, two high volatile bituminous (Pittsburgh No.8 and Illinois No.6), and one sub-bituminous (Powder River Basin), at pressures of 1, 2, and 3 MPa (10, 20, and 30 atm). The second series of experiments, which covered high-pressure burnout (HPBO) conditions, utilized a range of substantially longer combustion residence times to produce char burnout levels from 50% to 100%. The same three coals were tested at 1, 2, and 3 MPa, as well as at 0.2 MPa. Tests were also conducted on Pittsburgh No.8 coal in CO2 entrainment gas at 0.2, 1, and 2 MPa to begin establishing a database of experiments relevant to carbon sequestration techniques. The HPBO test series included use of an impactor-type particle sampler to measure the particle size distribution of fly ash produced under complete burnout conditions. The collected data have been interpreted with the help of CFD and detailed kinetics simulation to extend and validate devolatilization, char combustion and pollutant model at elevated pressure. A global NOX production sub-model has been proposed. The submodel reproduces the performance of the detailed chemical reaction mechanism for the NBFZ tests.

Stefano Orsino

2005-03-30T23:59:59.000Z

406

Anisotropic pressure and hyperons in neutron stars  

E-Print Network [OSTI]

We study the effects of anisotropic pressure on properties of the neutron stars with hyperons inside its core within the framework of extended relativistic mean field. It is found that the main effects of anisotropic pressure on neutron star matter is to increase the stiffness of the equation of state, which compensates for the softening of the EOS due to the hyperons. The maximum mass and redshift predictions of anisotropic neutron star with hyperonic core are quite compatible with the result of recent observational constraints if we use the parameter of anisotropic pressure model $h \\le 0.8$[1] and $\\Lambda \\le -1.15$ [2]. The radius of the corresponding neutron star at $M$=1.4 $M_\\odot$ is more than 13 km, while the effect of anisotropic pressure on the minimum mass of neutron star is insignificant. Furthermore, due to the anisotropic pressure in the neutron star, the maximum mass limit of higher than 2.1 $M_\\odot$ cannot rule out the presence of hyperons in the neutron star core.

A. Sulaksono

2014-12-23T23:59:59.000Z

407

Pressure balance at the magnetopause: Experimental studies  

E-Print Network [OSTI]

The pressure balance at the magnetopause is formed by magnetic field and plasma in the magnetosheath, on one side, and inside the magnetosphere, on the other side. In the approach of dipole earth's magnetic field configuration and gas-dynamics solar wind flowing around the magnetosphere, the pressure balance predicts that the magnetopause distance R depends on solar wind dynamic pressure Pd as a power low R ~ Pd^alpha, where the exponent alpha=-1/6. In the real magnetosphere the magnetic filed is contributed by additional sources: Chapman-Ferraro current system, field-aligned currents, tail current, and storm-time ring current. Net contribution of those sources depends on particular magnetospheric region and varies with solar wind conditions and geomagnetic activity. As a result, the parameters of pressure balance, including power index alpha, depend on both the local position at the magnetopause and geomagnetic activity. In addition, the pressure balance can be affected by a non-linear transfer of the solar ...

Suvorova, A V

2011-01-01T23:59:59.000Z

408

Microplasma Discharges in High Pressure Gases Scaling Towards the Sub-micron Regime  

E-Print Network [OSTI]

Atmospheric pressure microplasmas are uniquely characterized by their very high energy densities and also by their small discharge sizes. These properties allow for unique applications in plasma processing technologies. We have investigated...

Chitre, Aditya Rajeev

2012-02-14T23:59:59.000Z

409

E-Print Network 3.0 - argon gas pressure Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

pressure of each gas in the chamber atmosphere... Bio390 Problem: Gas Laws thanks to Dr. J.F. Anderson, Dept. ... Source: Prestwich, Ken - Biology Department, College of the Holy...

410

Analysis and experimental study on formation conditions of large-scale barrier-free diffuse atmospheric pressure air plasmas in repetitive pulse mode  

SciTech Connect (OSTI)

Atmospheric air diffuse plasmas have enormous application potential in various fields of science and technology. Without dielectric barrier, generating large-scale air diffuse plasmas is always a challenging issue. This paper discusses and analyses the formation mechanism of cold homogenous plasma. It is proposed that generating stable diffuse atmospheric plasmas in open air should meet the three conditions: high transient power with low average power, excitation in low average E-field with locally high E-field region, and multiple overlapping electron avalanches. Accordingly, an experimental configuration of generating large-scale barrier-free diffuse air plasmas is designed. Based on runaway electron theory, a low duty-ratio, high voltage repetitive nanosecond pulse generator is chosen as a discharge excitation source. Using the wire-electrodes with small curvature radius, the gaps with highly non-uniform E-field are structured. Experimental results show that the volume-scaleable, barrier-free, homogeneous air non-thermal plasmas have been obtained between the gap spacing with the copper-wire electrodes. The area of air cold plasmas has been up to hundreds of square centimeters. The proposed formation conditions of large-scale barrier-free diffuse air plasmas are proved to be reasonable and feasible.

Li, Lee, E-mail: leeli@mail.hust.edu.cn; Liu, Lun; Liu, Yun-Long; Bin, Yu; Ge, Ya-Feng; Lin, Fo-Chang [State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electric and Electronic Engineering, HuaZhong University of Science and Technology (HUST), Wuhan 430074 (China)

2014-01-14T23:59:59.000Z

411

Pressurized heat treatment of glass ceramic  

DOE Patents [OSTI]

A method of producing a glass-ceramic having a specified thermal expansion value is disclosed. The method includes the step of pressurizing the parent glass material to a predetermined pressure during heat treatment so that the glass-ceramic produced has a specified thermal expansion value. Preferably, the glass-ceramic material is isostatically pressed. A method for forming a strong glass-ceramic to metal seal is also disclosed in which the glass-ceramic is fabricated to have a thermal expansion value equal to that of the metal. The determination of the thermal expansion value of a parent glass material placed in a high-temperature environment is also used to determine the pressure in the environment.

Kramer, D.P.

1984-04-19T23:59:59.000Z

412

Pressure balanced drag turbine mass flow meter  

DOE Patents [OSTI]

The density of the fluid flowing through a tubular member may be measured by a device comprising a rotor assembly suspended within the tubular member, a fluid bearing medium for the rotor assembly shaft, independent fluid flow lines to each bearing chamber, and a scheme for detection of any difference between the upstream and downstream bearing fluid pressures. The rotor assembly reacts to fluid flow both by rotation and axial displacement; therefore concurrent measurements may be made of the velocity of blade rotation and also bearing pressure changes, where the pressure changes may be equated to the fluid momentum flux imparted to the rotor blades. From these parameters the flow velocity and density of the fluid may be deduced.

Dacus, M.W.; Cole, J.H.

1980-04-23T23:59:59.000Z

413

Pressure balanced drag turbine mass flow meter  

DOE Patents [OSTI]

The density of the fluid flowing through a tubular member may be measured by a device comprising a rotor assembly suspended within the tubular member, a fluid bearing medium for the rotor assembly shaft, independent fluid flow lines to each bearing chamber, and a scheme for detection of any difference between the upstream and downstream bearing fluid pressures. The rotor assembly reacts to fluid flow both by rotation and axial displacement; therefore concurrent measurements may be made of the velocity of blade rotation and also bearing pressure changes, where the pressure changes may be equated to the fluid momentum flux imparted to the rotor blades. From these parameters the flow velocity and density of the fluid may be deduced.

Dacus, Michael W. (Gilbert, AR); Cole, Jack H. (Fayetteville, AR)

1982-01-01T23:59:59.000Z

414

Piezoelectric Versus Mechanical Spring Pressure Gauge  

Science Journals Connector (OSTI)

That difficulties in the use of various types of pressure gauges warrant meticulous scrutiny in the rendering of an accurate pressure?time curve has advanced each type of gauge for particular work. In powder gas and internal combustion engine gas pressures the spring type and piezoelectric type offer great possibilities with the first a self?contained unit and the latter a charge?collecting device and with the former following the true curve by an admitted time lag and the latter assumed to be responding instantaneously. Sparse comparative records of the two show the case to be more nearly the reverse of what the popular assumption leads one to believe. Fuller data are needed to determine the comparative lagging characteristics of both types.

R. Alden Webster

1939-01-01T23:59:59.000Z

415

High-pressure cell for neutron diffraction with in situ pressure control at cryogenic temperatures  

SciTech Connect (OSTI)

Pressure generation at cryogenic temperatures presents a problem for a wide array of experimental techniques, particularly neutron studies due to the volume of sample required. We present a novel, compact pressure cell with a large sample volume in which load is generated by a bellow. Using a supply of helium gas up to a pressure of 350 bar, a load of up to 78 kN is generated with leak-free operation. In addition, special fiber ports added to the cryogenic center stick allow for in situ pressure determination using the ruby pressure standard. Mechanical stability was assessed using finite element analysis and the dimensions of the cell have been optimized for use with standard cryogenic equipment. Load testing and on-line experiments using NaCl and BiNiO{sub 3} have been done at the WISH instrument of the ISIS pulsed neutron source to verify performance.

Jacobsen, Matthew K.; Ridley, Christopher J.; Bocian, Artur; Kamenev, Konstantin V., E-mail: k.kamenev@ed.ac.uk [School of Engineering and CSEC, University of Edinburgh, Edinburgh (United Kingdom); Kirichek, Oleg; Manuel, Pascal; Khalyavin, Dmitry [ISIS, Rutherford Appleton Laboratory, Harwell Oxford (United Kingdom)] [ISIS, Rutherford Appleton Laboratory, Harwell Oxford (United Kingdom); Azuma, Masaki [Materials and Structures Laboratory, Tokyo Institute of Technology, Tokyo (Japan)] [Materials and Structures Laboratory, Tokyo Institute of Technology, Tokyo (Japan); Attfield, J. Paul [School of Chemistry and CSEC, University of Edinburgh, Edinburgh (United Kingdom)] [School of Chemistry and CSEC, University of Edinburgh, Edinburgh (United Kingdom)

2014-04-15T23:59:59.000Z

416

High-Pressure Tube Trailers and Tanks  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Berry Berry Salvador M. Aceves Lawrence Livermore National Laboratory (925) 422-0864 saceves@LLNL.GOV DOE Delivery Tech Team Presentation Chicago, Illinois February 8, 2005 Inexpensive delivery of compressed hydrogen with ambient temperature or cryogenic compatible vessels * Pressure vessel research at LLNL Conformable (continuous fiber and replicants) Cryo-compressed * Overview of delivery options * The thermodynamics of compressed and cryo-compressed hydrogen storage * Proposed analysis activities * Conclusions Outline We are investigating two techniques for reduced bending stress: continuous fiber vessels and vessels made of replicants Conformable tanks require internal stiffeners (ribs) to efficiently support the pressure and minimize bending stresses Spherical and cylindrical tanks

417

Variable pressure power cycle and control system  

DOE Patents [OSTI]

A variable pressure power cycle and control system that is adjustable to a variable heat source is disclosed. The power cycle adjusts itself to the heat source so that a minimal temperature difference is maintained between the heat source fluid and the power cycle working fluid, thereby substantially matching the thermodynamic envelope of the power cycle to the thermodynamic envelope of the heat source. Adjustments are made by sensing the inlet temperature of the heat source fluid and then setting a superheated vapor temperature and pressure to achieve a minimum temperature difference between the heat source fluid and the working fluid.

Goldsberry, Fred L. (Spring, TX)

1984-11-27T23:59:59.000Z

418

Solid-Phase Extraction Combined with High-Performance Liquid Chromatography?Atmospheric Pressure Chemical Ionization?Mass Spectrometry Analysis of Pesticides in Water:? Method Performance and Application in a Reconnaissance Survey of Residues in Drinking Water in Greater Cairo, Egypt  

Science Journals Connector (OSTI)

Solid-Phase Extraction Combined with High-Performance Liquid Chromatography?Atmospheric Pressure Chemical Ionization?Mass Spectrometry Analysis of Pesticides in Water:? Method Performance and Application in a Reconnaissance Survey of Residues in Drinking Water in Greater Cairo, Egypt ... Each shipment, which included 24 cartridges, weighed <454 g and cost approximately 200 Egyptian pounds ($40 U.S.). ...

Thomas L. Potter; Mahmoud A. Mohamed; Hannah Ali

2006-12-22T23:59:59.000Z

419

Effect of a non-thermal, atmospheric-pressure, plasma brush on conversion of model self-etch adhesive formulations compared to conventional photo-polymerization  

Science Journals Connector (OSTI)

Objective To determine the effectiveness and efficiency of non-thermal, atmospheric plasmas for inducing polymerization of model dental self-etch adhesives. Methods The monomer mixtures used were bis-[2-(methacryloyloxy)ethyl] phosphate (2MP) and 2-hydroxyethyl methacrylate (HEMA), with mass ratios of 70/30, 50/50 and 30/70. Water was added to the above formulations: 10–30 wt%. These monomer/water mixtures were treated steadily for 40 s under a non-thermal atmospheric plasma brush working at temperatures from 32 to 35 °C. For comparison, photo-initiators were added to the above formulations for photo-polymerization studies, which were light-cured for 40 s. The degree of conversion (DC) of both the plasma- and light-cured samples was measured using FTIR spectroscopy with an attenuated total reflectance attachment. Results The non-thermal plasma brush was effective in inducing polymerization of the model self-etch adhesives. The presence of water did not negatively affect the DC of plasma-cured samples. Indeed, DC values slightly increased, with increasing water content in adhesives: from 58.3% to 68.7% when the water content increased from 10% to 30% in the adhesives with a 50/50 (2MP/HEMA) mass ratio. Conversion values of the plasma-cured groups were higher than those of light-cured samples with the same mass ratio and water content. Spectral differences between the plasma- and light-cured groups indicate subtle structural distinctions in the resultant polymer networks. Significance This research if the first to demonstrate that the non-thermal plasma brush induces polymerization of model adhesives under clinical settings by direct/indirect energy transfer. This device shows promise for polymerization of dental composite restorations having enhanced properties and performance.

Mingsheng Chen; Ying Zhang; Xiaomei Yao; Hao Li; Qingsong Yu; Yong Wang

2012-01-01T23:59:59.000Z

420

Multiplexed pressure sensing with elastomer membranes Antony Orth,*a  

E-Print Network [OSTI]

demonstrate a novel optical pressure measurement platform for microfluidics. The pressure sensors operate be used to perform sensitive multiplexed pressure measurements in microfluidic channels. Introduction Pressure is a fundamental quantity of interest in fluid dynamics. Given the recent focus on microfluidic

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421

Fuel Cell Technologies Office: International Hydrogen Fuel and Pressure  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

International Hydrogen International Hydrogen Fuel and Pressure Vessel Forum to someone by E-mail Share Fuel Cell Technologies Office: International Hydrogen Fuel and Pressure Vessel Forum on Facebook Tweet about Fuel Cell Technologies Office: International Hydrogen Fuel and Pressure Vessel Forum on Twitter Bookmark Fuel Cell Technologies Office: International Hydrogen Fuel and Pressure Vessel Forum on Google Bookmark Fuel Cell Technologies Office: International Hydrogen Fuel and Pressure Vessel Forum on Delicious Rank Fuel Cell Technologies Office: International Hydrogen Fuel and Pressure Vessel Forum on Digg Find More places to share Fuel Cell Technologies Office: International Hydrogen Fuel and Pressure Vessel Forum on AddThis.com... Publications Program Publications Technical Publications

422

PRESSURE TRANSIENT ANALYSIS FOR COMPOSITE SYSTEMS  

E-Print Network [OSTI]

SGP-TR-117 PRESSURE TRANSIENT ANALYSIS FOR COMPOSITE SYSTEMS Ani1 Kumar Ambastha October 1988 my graduate studies. #12;f #12;ABSTRACT A composite reservoir model is used to analyze well. A composite reservoir is made up of two or more regions. Each region has its own rock and fluid properties

Stanford University

423

PRESSURIZED EQUIPMENT AND SYSTEMS Table Of Contents  

E-Print Network [OSTI]

with inspection doors (such as oil-filled (governor) pressure tanks), hydrostatic tests need only be given, such as air, are prohibited, except for: (1) testing of bulk petroleum, oil, and lubricant (POL) storage tanks Compressed Air and Gas Systems.............................. 20-5 20.C Boilers and Systems

US Army Corps of Engineers

424

Column Design in High Pressure Liquid Chromatography  

Science Journals Connector (OSTI)

......consideration, and the high inlet pressure is the price to be paid for the short analysis time...silicious support impregnated with paraffin oil in reversed phase chromatography. As op...in the above described manner following heating of the product at 450 C. With relatively......

Csaba Horvath; S. R. Lipsky

1969-02-01T23:59:59.000Z

425

Reconstruction of Pressure Profile Evolution during  

E-Print Network [OSTI]

. Boxer, J. Ellsworth, D. Garnier, J. Kesner Plasma Science & Fusion Center Massachusetts Institue. 77 Massachusetts Avenue, NW16, Cambridge, MA 02139 phone: 617-253-8100, info@psfc.mit.edu APS-Parker-Sckopke Relation (Burton, McPherron, Russell, JGR, 1975) Solar Wind Pressure Solar Wind Convection Field 5 MA Dst 1

426

Reconstruction of Pressure Profile Evolution during  

E-Print Network [OSTI]

. Boxer, J. Ellsworth, D. Garnier, J. Kesner Plasma Science & Fusion Center Massachusetts Institue. 77 Massachusetts Avenue, NW16, Cambridge, MA 02139 phone: 617-253-8100, info@psfc.mit.edu ICC-Parker-Sckopke Relation (Burton, McPherron, Russell, JGR, 1975) Solar Wind Pressure Solar Wind Convection Field 5 MA Dst 1

427

Column Design in High Pressure Liquid Chromatography  

Science Journals Connector (OSTI)

......School of Medicine, New Haven, Connecticut Presented at the Fit th International...high inlet pressure is the price to be paid for the short analysis...support impregnated with paraffin oil in reversed phase chromatography...described manner following heating of the product at 450 C. With......

Csaba Horvath; S. R. Lipsky

1969-02-01T23:59:59.000Z

428

Pressure wave charged repetitively pulsed gas laser  

DOE Patents [OSTI]

A repetitively pulsed gas laser in which a system of mechanical shutters bracketing the laser cavity manipulate pressure waves resulting from residual energy in the cavity gas following a lasing event so as to draw fresh gas into the cavity and effectively pump spent gas in a dynamic closed loop.

Kulkarny, Vijay A. (Redondo Beach, CA)

1982-01-01T23:59:59.000Z

429

Geological Aspects of High-Pressure Research  

Science Journals Connector (OSTI)

...garnet-pyroxene assemblage typical of eclogites by heating it for an hour at 1200 C at a pressure...eclogite at the M discontinuity. The geothermal gradient would have to have curved so...kyanite-sillimanite transition three times. The geothermal gradient probably has a slope not far...

F. R. Boyd

1964-07-03T23:59:59.000Z

430

Star wars: US pressure on Japan  

Science Journals Connector (OSTI)

... US Strategic Defense Initiative ("star wars") seems to have found a fan in Japan's Prime Minister Yasuhiro Nakasone, who has been extolling its virtues in recent Diet ... after his meeting with President Ronald Reagan in Los Angeles earlier this year. Pressure for Japan to make its support official is being kept up by a series of visits from ...

David Swinbanks

1985-04-25T23:59:59.000Z

431

Advanced Diagnostics for High Pressure Spray Combustion.  

SciTech Connect (OSTI)

The development of accurate predictive engine simulations requires experimental data to both inform and validate the models, but very limited information is presently available about the chemical structure of high pressure spray flames under engine- relevant conditions. Probing such flames for chemical information using non- intrusive optical methods or intrusive sampling techniques, however, is challenging because of the physical and optical harshness of the environment. This work details two new diagnostics that have been developed and deployed to obtain quantitative species concentrations and soot volume fractions from a high-pressure combusting spray. A high-speed, high-pressure sampling system was developed to extract gaseous species (including soot precursor species) from within the flame for offline analysis by time-of-flight mass spectrometry. A high-speed multi-wavelength optical extinction diagnostic was also developed to quantify transient and quasi-steady soot processes. High-pressure sampling and offline characterization of gas-phase species formed following the pre-burn event was accomplished as well as characterization of gas-phase species present in the lift-off region of a high-pressure n-dodecane spray flame. For the initial samples discussed in this work several species were identified, including polycyclic aromatic hydrocarbons (PAH); however, quantitative mole fractions were not determined. Nevertheless, the diagnostic developed here does have this capability. Quantitative, time-resolved measurements of soot extinction were also accomplished and the novel use of multiple incident wavelengths proved valuable toward characterizing changes in soot optical properties within different regions of the spray flame.

Skeen, Scott A.; Manin, Julien Luc; Pickett, Lyle M.

2014-06-01T23:59:59.000Z

432

Non-thermal atmospheric pressure plasma induces apoptosis in oral cavity squamous cell carcinoma: Involvement of DNA-damage-triggering sub-G1 arrest via the ATM/p53 pathway  

Science Journals Connector (OSTI)

Abstract Recent advances in physics have made possible the use of non-thermal atmospheric pressure plasma (NTP) in cancer research. Although increasing evidence suggests that NTP induces death of various cancer cell types, thus offering a promising alternative treatment, the mechanism of its therapeutic effect is little understood. In this study, we report for the first time that NTP led to apoptotic cell death in oral cavity squamous cell carcinoma (OSCC). Interestingly, NTP induced a sub-G1 arrest in p53 wild-type OSCCs, but not in p53-mutated OSCCs. In addition, NTP increased the expression levels of ATM, p53 (Ser 15, 20 and 46), p21, and cyclin D1. A comet assay, Western blotting and immunocytochemistry of ?H2AX suggested that NTP-induced apoptosis and sub-G1 arrest were associated with DNA damage and the ATM/p53 signaling pathway in SCC25 cells. Moreover, ATM knockdown using siRNA attenuated the effect of NTP on cell death, sub-G1 arrest and related signals. Taken together, these results indicate that NTP induced apoptotic cell death in p53 wild-type \\{OSCCs\\} through a novel mechanism involving DNA damage and triggering of sub-G1 arrest via the ATM/p53 pathway. These findings show the therapeutic potential of NTP in OSCC.

Jae Won Chang; Sung Un Kang; Yoo Seob Shin; Kang Il Kim; Seong Jin Seo; Sang Sik Yang; Jong-Soo Lee; Eunpyo Moon; Seung Jae Baek; Keunho Lee; Chul-Ho Kim

2014-01-01T23:59:59.000Z

433

Effective phase control of silicon films during high-rate deposition in atmospheric-pressure very high-frequency plasma: Impacts of gas residence time on the performance of bottom-gate thin film transistors  

Science Journals Connector (OSTI)

Abstract Hydrogenated amorphous silicon (a-Si) and microcrystalline silicon (?c-Si) films were grown in atmospheric-pressure (AP) He/H2/SiH4 plasma excited by a 150-MHz very high-frequency (VHF) power at a temperature of 220 °C. The variations in thickness and crystallinity of the deposited Si films along the gas flow direction were studied as functions of gas residence time in the plasma, VHF power density and H2 flow rate. Furthermore, the electrical characteristics of bottom-gate thin film transistors (TFTs) were investigated to evaluate the film quality. The results revealed that the chemical reactions both in gas phase and on the growing film surface were significantly enhanced in AP-VHF plasma, promoting phase transition from amorphous to microcrystalline in a time of the order of 0.1 ms. The performance of the \\{TFTs\\} showed that a-Si layers formed in the upstream portion of the plasma zone had reasonably good electrical property (field-effect mobility of approximately 2 cm2/V s) despite very high deposition rates around 20 nm/s. While ?c-Si layers deposited in the downstream portion were very defective, which might come from the insufficient passivation of grain boundaries with a-Si tissues due to a too long gas residence time in the plasma. The precise control of gas residence time by adjusting the length of plasma will be effective for the phase control of Si films with desired quality.

H. Kakiuchi; H. Ohmi; T. Yamada; A. Hirano; T. Tsushima; W. Lin; K. Yasutake

2013-01-01T23:59:59.000Z

434

On the use of the double floating probe method to infer the difference between the electron and the heavy particles temperatures in an atmospheric pressure, vortex-stabilized nitrogen plasma jet  

SciTech Connect (OSTI)

Sweeping double probe measurements in an atmospheric pressure direct current vortex-stabilized plasma jet are reported (plasma conditions: 100 A discharge current, N{sub 2} gas flow rate of 25 Nl/min, thoriated tungsten rod-type cathode, copper anode with 5 mm inner diameter). The interpretation of the double probe characteristic was based on a generalization of the standard double floating probe formulae for non-uniform plasmas coupled to a non-equilibrium plasma composition model. Perturbations caused by the current to the probe together with collisional and thermal processes inside the probe perturbed region were taken into account. Radial values of the average electron and heavy particle temperatures as well as the electron density were obtained. The calculation of the temperature values did not require any specific assumption about a temperature relationship between different particle species. An electron temperature of 10?900 ± 900 K, a heavy particle temperature of 9300 ± 900 K, and an electron density of about 3.5 × 10{sup 22} m{sup ?3} were found at the jet centre at 3.5 mm downstream from the torch exit. Large deviations from kinetic equilibrium were found toward the outer border of the plasma jet. These results showed good agreement with those previously reported by the authors by using a single probe technique. The calculations have shown that this method is particularly useful for studying spraying-type plasma torches operated at power levels of about 15 kW.

Prevosto, L., E-mail: prevosto@waycom.com.ar; Mancinelli, B. R. [Grupo de Descargas Eléctricas, Departamento Ingeniería Electromecánica, Facultad Regional Venado Tuerto (UTN), Laprida 651, 2600 Venado Tuerto, Santa Fe (Argentina)] [Grupo de Descargas Eléctricas, Departamento Ingeniería Electromecánica, Facultad Regional Venado Tuerto (UTN), Laprida 651, 2600 Venado Tuerto, Santa Fe (Argentina); Kelly, H. [Grupo de Descargas Eléctricas, Departamento Ingeniería Electromecánica, Facultad Regional Venado Tuerto (UTN), Laprida 651, 2600 Venado Tuerto, Santa Fe (Argentina) [Grupo de Descargas Eléctricas, Departamento Ingeniería Electromecánica, Facultad Regional Venado Tuerto (UTN), Laprida 651, 2600 Venado Tuerto, Santa Fe (Argentina); Instituto de Física del Plasma (CONICET), Departamento de Física, Facultad de Ciencias Exactas y Naturales (UBA) Ciudad Universitaria Pab. I, 1428 Buenos Aires (Argentina)

2014-05-15T23:59:59.000Z

435

Rotating disk electrode apparatus for the study of fuel cell reactions at elevated temperatures and pressures  

SciTech Connect (OSTI)

A rotating disk electrode apparatus for studying fuel cell reactions at elevated temperatures and pressures was described. Preliminary data for oxygen reduction in 89.5 percent H3PO4 at temperatures up to 205 C and pressures up to 7.6 A were provided. The Tafel slope was approximately 120 mV/decade and invariant with temperature up to 175 C and pressures near atmospheric. Increasing the pressure to 3 A at 175 C caused the Tafel slope to decrease to a value of approximately RT/F. Above 3 A, the current was proportional to the oxygen pressure. A first order dependence with respect to oxygen pressure was suggested, as well as a mechanism change with increasing oxygen coverage of the platinum. 10 references.

Mcbreen, J.; Ogrady, W.E.; Richter, R.

1984-05-01T23:59:59.000Z

436

Flash High-Pressure Condensate to Regenerate Low-Pressure Steam  

SciTech Connect (OSTI)

This revised ITP tip sheet on regenerating low-pressure steam provides how-to advice for improving industrial steam systems using low-cost, proven practices and technologies.

Not Available

2006-01-01T23:59:59.000Z

437

Pressure Transient Analysis of Bottomhole Pressure and Rate Measurements Using System Identification  

E-Print Network [OSTI]

is a zero rate obtained by a quick-closing down hole valve during "drillstem testing". More inaccurate "zero storage coefficient"). In conventional PTA, the step response in the bottom hole pressure resulting from

Van den Hof, Paul

438

Pressure, temperature, and dissolved gas dependence of dielectric breakdown in water.  

Science Journals Connector (OSTI)

It has been shown experimentally that the optical breakdown strength of water is a pressure dependent quantity growing with increasing pressure. The dependence of the breakdown strength on temperature and dissolved gas concentration over a larger range of pressures will be observed. Using a custom fabricated pressure vessel and high?power Nd:YAG laser breakdown events will be generated and observed over a range of pressures from 0 to 25 kpsi. Observations of breakdown events will be made using a high?speed photodetector located behind the pressure vessel’s optical windows. Dissolved gas concentration will be controlled and varied using a custom water preparation system over a range from water’s vapor pressure (?20 torr) to atmospheric pressure.Temperature will be monitored using a thermocouple attached to the pressure vessel and the temperature dependence will be measured over a range from 20 to 35 °C. A comparison between current single detector methods and previous imaging methods of using breakdown to determine absolute pressure will then be made. [Work supported by Impulse Devices Inc.

Jonathan Sukovich; R. Glynn Holt

2010-01-01T23:59:59.000Z

439

Magnetic Switching under Pressure | Advanced Photon Source  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Revealing the Secrets of Chemical Bath Deposition Revealing the Secrets of Chemical Bath Deposition DNA Repair Protein Caught in the Act of Molecular Theft Velcro for Nanoparticles A Molecular Fossil Ultrafast Imaging of Electron Waves in Graphene Science Highlights Archives: 2013 | 2012 | 2011 | 2010 2009 | 2008 | 2007 | 2006 2005 | 2004 | 2003 | 2002 2001 | 2000 | 1998 | Subscribe to APS Science Highlights rss feed Magnetic Switching under Pressure DECEMBER 2, 2010 Bookmark and Share A schematic representation of the pressure-induced magnetic switching effect. The colored images highlight the direction of the magnetic orbital (grey plane) for the copper centers (green balls: copper, blue: nitrogen, red: oxygen/water, yellow: fluoride). A material's properties are a critical factor in the way that material

440

BOP Pressure Summary 28 May 2010  

Broader source: Energy.gov (indexed) [DOE]

Pressures (psi) +/- 50 psi" Pressures (psi) +/- 50 psi" ,,,,,,,"Pre Kill","Post Kill","Post Junk","Post Junk shot 2" ,,,,,,,2250,2250,2250,2250 ,,,,,,"Delta",310,250,229 ,,,,,,,2560,2500,2479 ,,,,,,"Delta",60,120,108,493 ,,,,,,,2620,2620,2587,2743 ,,,,,,"Delta",620,510,794,410 ,,,,,,,3240,3130,3381,3153 ,,,,,,"Delta",430,150,284,242 ,,26.51,,,,,3670,3280,3665,3395 ,,,,,,"Delta",730,40,32,101 ,,,,,,"BOP Pres",4400,3320,3697,3496 ,,,,,,"(corrected)","(Test Ram closed)","(Test Ram open)","(Test Ram open)","(Test Ram open)" "Top of Wellhead:",,"5053 ft" ,"BP MACONDO" ,"TOP KILL PROCEDURE - MC252 #1"

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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

Pressure Change Measurement Leak Testing Errors  

SciTech Connect (OSTI)

A pressure change test is a common leak testing method used in construction and Non-Destructive Examination (NDE). The test is known as being a fast, simple, and easy to apply evaluation method. While this method may be fairly quick to conduct and require simple instrumentation, the engineering behind this type of test is more complex than is apparent on the surface. This paper intends to discuss some of the more common errors made during the application of a pressure change test and give the test engineer insight into how to correctly compensate for these factors. The principals discussed here apply to ideal gases such as air or other monoatomic or diatomic gasses; however these same principals can be applied to polyatomic gasses or liquid flow rate with altered formula specific to those types of tests using the same methodology.

Pryor, Jeff M [ORNL] [ORNL; Walker, William C [ORNL] [ORNL

2014-01-01T23:59:59.000Z

442

Casing design for trapped annular pressure buildup  

SciTech Connect (OSTI)

Conventional single-string analysis for casing design with annular-fluid expansion can underpredict or overpredict pressures between strings because multistring effects are neglected. Multiple-string systems with multiple sealed annuli behave as composite interactive systems. This paper presents a constitutive-based multistring analysis method for composite string effects and complex fluid behavior. The composite stiffness of cemented casings is determined from elastic stress/strain relationships, and the nonlinear fluid behavior is modeled by direct use of fluid PVT relations in the formulation and solution. The method is incorporated in a computer model linking comprehensive stress calculations to accurate temperature and pressure predictions. Sensitivity studies of the system response to various key parameters and operating conditions are presented, and comparisons are made with single-string analyses to demonstrate the strong interaction between casing strings.

Halal, A.S.; Mitchell, R.F. (Enertech Engineering Research Co., Houston, TX (United States))

1994-06-01T23:59:59.000Z

443

Boron determinations in pressure vessel steels  

SciTech Connect (OSTI)

Several studies have suggested that low-energy neutrons contribute to reactor pressure vessel (PV) embrittlement through interactions with boron impurities in the steel. Until now, the available information on boron contents in pressure vessel steels has been based on nominal concentrations or estimates provided by the materials manufacturers. To help resolve the question of boron contribution to PV steel embrittlement, samples of 38 different PV steels were analyzed by high-sensitivity gas mass spectrometry for their helium and boron contents. The boron contents were determined by measuring the increase in helium content in each material as a result of additional thermal neutron exposure. The results of these analyses showed natural boron contents that ranged from 0.23 to 5.11 wt. ppm in the various alloys.

Oliver, B.M. [Rockwell International Corp., Canoga Park, CA (United States). Rocketdyne Div.; McElroy, W.N. [Consultants and Technology Services, Richland, WA (United States); Kellogg, L.S. [Battelle-Pacific Northwest Lab., Richland, WA (United States); Farrar, H. IV

1994-12-31T23:59:59.000Z

444

Detecting solar chameleons through radiation pressure  

E-Print Network [OSTI]

Light scalar fields can drive the accelerated expansion of the universe. Hence, they are obvious dark energy candidates. To make such models compatible with tests of General Relativity in the solar system and "fifth force" searches on Earth, one needs to screen them. One possibility is the so-called "chameleon" mechanism, which renders an effective mass depending on the local matter density. If chameleon particles exist, they can be produced in the sun and detected on earth exploiting the equivalent of a radiation pressure. Since their effective mass scales with the local matter density, chameleons can be reflected by a dense medium if their effective mass becomes greater than their total energy. Thus, under appropriate conditions, a flux of solar chameleons may be sensed by detecting the total instantaneous momentum transferred to a suitable opto-mechanical force/pressure sensor. We calculate the solar chameleon spectrum and the reach in the chameleon parameter space of an experiment using the preliminary re...

Baum, S; Hoffmann, D H H; Karuza, M; Semertzidis, Y K; Upadhye, A; Zioutas, K

2014-01-01T23:59:59.000Z

445

Regelation: why does ice melt under pressure?  

E-Print Network [OSTI]

Unlike other unusual materials whose bonds contract under compression, the O:H nonbond undergoes contraction and the H-O bond elongation towards O:H and H-O length symmetry in water and ice. The energy drop of the H-O bond dictates the melting point Tm depression of ice. Once the pressure is relieved, the O:H-O bond fully recovers its initial state, resulting in Regelation.

Sun, Chang Q

2015-01-01T23:59:59.000Z

446

Low-Cost Fiber Optic Pressure Sensor  

DOE Patents [OSTI]

The size and cost of fabricating fiber optic pressure sensors is reduced by fabricating the membrane of the sensor in a non-planar shape. The design of the sensors may be made in such a way that the non-planar membrane becomes a part of an air-tight cavity, so as to make the membrane resilient due to the air-cushion effect of the air-tight cavity. Such non-planar membranes are easier to make and attach.

Sheem, Sang K. (Pleasanton, CA)

2003-07-22T23:59:59.000Z

447

Low-Cost Fiber Optic Pressure Sensor  

DOE Patents [OSTI]

The size and cost of fabricating fiber optic pressure sensors is reduced by fabricating the membrane of the sensor in a non-planar shape. The design of the sensors may be made in such a way that the non-planar membrane becomes a part of an air-tight cavity, so as to make the membrane resilient due to the air-cushion effect of the air-tight cavity. Such non-planar membranes are easier to make and attach.

Sheem, Sang K. (Pleasanton, CA)

2004-05-18T23:59:59.000Z

448

An investigation of convergence pressure methods  

E-Print Network [OSTI]

of carbon dioxide, hydrogen sulfide, nitrogen, hydrocarbons having molecular weights from methane through hexane, and the remainder of the hydrocarbons are lumped into a single pseudocomponent G7+. Butane and pentane are further split into iso and normal... of Mixtures Versus Saturation Pressure Number of Mixtures Versus Temperature 55 56 10 Number of Mixtures Versus Mole Fraction of Carbon Dioxide 57 Number of Mixtures Versus Mole Fraction of Hydrogen Sulfide 12 Number of Mixtures Versus Mole Fraction...

Wattenbarger, Robert Chick

1986-01-01T23:59:59.000Z

449

Surveillance Guide - OSS 19.4 Pressure Safety  

Broader source: Energy.gov (indexed) [DOE]

PRESSURE SAFETY PRESSURE SAFETY 1.0 Objective The objective of this surveillance is to evaluate the contractor's implementation of programs to ensure the integrity of pressure vessels and minimize risks from failure of vessels to the public and to workers. Facility Representatives will examine the installed configuration of pressure vessels, observe pressure testing and review documentation associated with maintenance or repair of pressure vessels. In performing the surveillance, Facility Representatives will examine implementation of applicable DOE requirements and best practices. 2.0 References 2.1 DOE 5480.4, Environmental Protection, Safety and Health Protection Standards 2.2 DOE 5483.1A, Occupational Safety and Health Programs

450

Ram Pressure Stripping in Clusters and Groups  

E-Print Network [OSTI]

Ram pressure stripping is an important process in the evolution of both dwarf galaxies and large spirals. Large spirals are severely stripped in rich clusters and may be mildly stripped in groups. Dwarf galaxies can be severely stripped in both clusters and groups. A model is developed that describes the stripping of a satellite galaxy's outer H \\textsc{i} disk and hot galactic halo. The model can be applied to a wide range of environments and satellite galaxy masses. Whether ram pressure stripping of the outer disk or hot galactic halo occurs is found to depend primarily on the ratio of the satellite galaxy mass to the mass of the host group or cluster. How the effectiveness of ram pressure stripping depends on the density of the inter-group gas, the dark matter halo concentrations, and the scale lengths and masses of the satellite components is explored. The predictions of the model are shown to be well matched to H \\textsc{i} observations of spirals in a sample of nearby clusters. The model is used to predict the range of H \\textsc{i} gas fractions a satellite of mass $M_{v,sat}$ can lose orbiting in a cluster of mass $M_{v,gr}$.

J. A. Hester

2006-10-03T23:59:59.000Z

451

Atmospheric pressure gas plasma-induced colorectal cancer cell death is mediated by Nox2–ASK1 apoptosis pathways and oxidative stress is mitigated by Srx–Nrf2 anti-oxidant system  

Science Journals Connector (OSTI)

Abstract Atmospheric pressure gas plasma (AGP) generates reactive oxygen species (ROS) that induce apoptosis in cultured cancer cells. The majority of cancer cells develop a ROS-scavenging anti-oxidant system regulated by Nrf2, which confers resistance to ROS-mediated cancer cell death. Generation of ROS is involved in the AGP-induced cancer cell death of several colorectal cancer cells (Caco2, HCT116 and SW480) by activation of ASK1-mediated apoptosis signaling pathway without affecting control cells (human colonic sub-epithelial myofibroblasts; CO18, human fetal lung fibroblast; MRC5 and fetal human colon; FHC). However, the identity of an oxidase participating in AGP-induced cancer cell death is unknown. Here, we report that AGP up-regulates the expression of Nox2 (NADPH oxidase) to produce ROS. RNA interference designed to target Nox2 effectively inhibits the AGP-induced ROS production and cancer cell death. In some cases both colorectal cancer HT29 and control cells showed resistance to AGP treatment. Compared to AGP-sensitive Caco2 cells, HT29 cells show a higher basal level of the anti-oxidant system transcriptional regulator Nrf2 and its target protein sulfiredoxin (Srx) which are involved in cellular redox homeostasis. Silencing of both Nrf2 and Srx sensitized HT29 cells, leads to ROS overproduction and decreased cell viability. This indicates that in HT29 cells, Nrf2/Srx axis is a protective factor against AGP-induced oxidative stress. The inhibition of Nrf2/Srx signaling should be considered as a central target in drug-resistant colorectal cancer treatments.

Musarat Ishaq; Margaret D.M. Evans; Kostya (Ken) Ostrikov

2014-01-01T23:59:59.000Z

452

Analysis of crude oil vapor pressures at the U.S. Strategic Petroleum Reserve.  

SciTech Connect (OSTI)

Crude oil storage caverns at the U.S. Strategic Petroleum Reserve (SPR) are solution-mined from subsurface salt domes along the U.S. Gulf Coast. While these salt domes exhibit many attractive characteristics for large-volume, long-term storage of oil such as low cost for construction, low permeability for effective fluids containment, and secure location deep underground, they also present unique technical challenges for maintaining oil quality within delivery standards. The vapor pressures of the crude oils stored at SPR tend to increase with storage time due to the combined effects of geothermal heating and gas intrusion from the surrounding salt. This presents a problem for oil delivery offsite because high vapor-pressure oil may lead to excessive atmospheric emissions of hydrocarbon gases that present explosion hazards, health hazards, and handling problems at atmospheric pressure. Recognizing this potential hazard, the U.S. Department of Energy, owner and operator of the SPR, implemented a crude oil vapor pressure monitoring program that collects vapor pressure data for all the storage caverns. From these data, DOE evaluates the rate of change in vapor pressures of its oils in the SPR. Moreover, DOE implemented a vapor pressure mitigation program in which the oils are degassed periodically and will be cooled immediately prior to delivery in order to reduce the vapor pressure to safe handling levels. The work described in this report evaluates the entire database since its origin in 1993, and determines the current levels of vapor pressure around the SPR, as well as the rate of change for purposes of optimizing both the mitigation program and meeting safe delivery standards. Generally, the rate of vapor pressure increase appears to be lower in this analysis than reported in the past and, problematic gas intrusion seems to be limited to just a few caverns. This being said, much of the current SPR inventory exceeds vapor pressure delivery guidelines and must be degassed and cooled in order to meet current delivery standards.

Rudeen, David Keith (GRAM, Inc., Albuquerque, NM); Lord, David L.

2005-08-01T23:59:59.000Z

453

A University Consortium on Efficient and Clean High-Pressure...  

Broader source: Energy.gov (indexed) [DOE]

Efficient and Clean High-Pressure, Lean Burn (HPLB) Engines A University Consortium on Efficient and Clean High-Pressure, Lean Burn (HPLB) Engines 2010 DOE Vehicle Technologies and...

454

DOE Hydrogen Delivery High-Pressure Tanks and Analysis Project...  

Broader source: Energy.gov (indexed) [DOE]

Delivery High-Pressure Tanks and Analysis Project Review Meeting DOE Hydrogen Delivery High-Pressure Tanks and Analysis Project Review Meeting On February 8-9, 2005, the Department...

455

Energy Savings from Floating Head Pressure in Ammonia Refrigeration Systems  

E-Print Network [OSTI]

This paper presents case studies of two moderately sized ammonia refrigeration systems retrofitted for floating head pressure control. It also presents a parametric analysis to assist in selecting appropriate pressures in an ammonia refrigeration...

Barrer, P. J.; Jones, S. M.

456

Near-Ground Pressure and Wind Measurements in Tornadoes  

Science Journals Connector (OSTI)

Since the spring of 2002, tornadoes were sampled on nine occasions using Hardened In-Situ Tornado Pressure Recorder probes, video probes, and mobile mesonet instrumentation. This study describes pressure and, in some cases, velocity data obtained ...

Christopher D. Karstens; Timothy M. Samaras; Bruce D. Lee; William A. Gallus Jr.; Catherine A. Finley

2010-07-01T23:59:59.000Z

457

Sandia National Laboratories: High-Pressure and High-Temperature...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ClimateECClimateCarbon CaptureHigh-Pressure and High-Temperature Neutron Reflectometry Cell for Solid-Fluid Interface Studies High-Pressure and High-Temperature Neutron...

458

Electrical resistance of Manganin under high static pressures  

Science Journals Connector (OSTI)

The electrical resistance of manganin was measured under pressures up to 220 kbar at room temperature. The pressure was produced by means of a multianvil apparatus using semisintered magnesia for the pressure medium and was calibrated against well?known fixed points. Obtained results show a linear relationship between the resistance and pressure up to 180 kbar with good reproducibility. The pressure coefficient of resistance turns out to be (2.322±0.008) ×10?3 kbar?1 which is in close agreement with the value obtained under hydrostatic conditions. Manganin can be satisfactorily used as a pressure gauge for a high?pressure experiment using a solidpressure medium. The deviation from the linearity observed above 180 kbar is ascribed to either an intrinsic property of Manganin or the uncertainty of the fixed point adopted. If the linearity is assumed above 180 kbar the transition pressure of GaP is estimated to be 206±2 kbar.

N. Fujioka; O. Mishima; S. Endo; N. Kawai

1978-01-01T23:59:59.000Z

459

Iterative Boltzmann plot method for temperature and pressure determination in a xenon high pressure discharge lamp  

SciTech Connect (OSTI)

The Boltzmann plot method allows to calculate plasma temperatures and pressures if absolutely calibrated emission coefficients of spectral lines are available. However, xenon arcs are not very well suited to be analyzed this way, as there are only a limited number of lines with atomic data available. These lines have high excitation energies in a small interval between 9.8 and 11.5 eV. Uncertainties in the experimental method and in the atomic data further limit the accuracy of the evaluation procedure. This may result in implausible values of temperature and pressure with inadmissible uncertainty. To omit these shortcomings, an iterative scheme is proposed that is making use of additional information about the xenon fill pressure. This method is proved to be robust against noisy data and significantly reduces the uncertainties. Intentionally distorted synthetic data are used to illustrate the performance of the method, and measurements performed on a laboratory xenon high pressure discharge lamp are analyzed resulting in reasonable temperatures and pressures with significantly reduced uncertainties.

Zalach, J.; Franke, St. [INP Greifswald, Felix-Hausdorff-Str. 2, 17489 Greifswald (Germany)

2013-01-28T23:59:59.000Z

460

Forum Agenda: International Hydrogen Fuel and Pressure Vessel Forum  

Broader source: Energy.gov [DOE]

Agenda for the International Hydrogen Fuel and Pressure Vessel Forum held Sept. 27-29, 2010, in Beijing, China

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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

Pressurized tundish for controlling a continuous flow of molten metal  

DOE Patents [OSTI]

A pressurized tundish for controlling a continous flow of molten metal characterized by having a pair of principal compartments, one being essentially unpressurized and receiving molten metal introduced thereto, and the other being adapted for maintaining a controlled gaseous pressure over the surface of the fluid metal therein, whereby, by controlling the pressure within the pressurized chamber, metal exiting from the tundish is made to flow continually and at a controlled rate.

Lewis, Thomas W. (964 Cork Dr., Bethel Park, PA 15102); Hamill, Jr., Paul E. (R.D. #1, Box 173A1, Jeannette, PA 15644); Ozgu, Mustafa R. (790 Yorkshire Rd., Bethlehem, PA 18017); Padfield, Ralph C. (1918 Paul Ave., Bethlehem, PA 18018); Rego, Donovan N. (1703 W. Brown St., Allentown, PA 18104); Brita, Guido P. (3225 Edna Terrace Ave., Bethlehem, PA 18017)

1990-01-01T23:59:59.000Z

462

Field measurements of earth pressure on a cantilever retaining wall  

E-Print Network [OSTI]

. The measurements were made before and after backfilling for a duration of 385 days. The effects of a clay surcharge were studied. The total thrust of the measured lateral earth pressures was com- pared to total thrust determined from a Culmann graphical... to bearing pressures calculated by conventional methods. The measured bearing pressures compared reasonably well with the calculated pressures. Wall movement data indicated that the wall tilted or rotated toward the backfill during sand backfilling...

Schulze, Larry Wayne

2012-06-07T23:59:59.000Z

463

Pressurized tundish for controlling a continuous flow of molten metal  

DOE Patents [OSTI]

A pressurized tundish for controlling a continuous flow of molten metal is characterized by having a pair of principal compartments, one being essentially unpressurized and receiving molten metal introduced thereto, and the other being adapted for maintaining a controlled gaseous pressure over the surface of the fluid metal therein, whereby, by controlling the pressure within the pressurized chamber, metal exiting from the tundish is made to flow continually and at a controlled rate. 1 fig.

Lewis, T.W.; Hamill, P.E. Jr.; Ozgu, M.R.; Padfield, R.C.; Rego, D.N.; Brita, G.P.

1990-07-24T23:59:59.000Z

464

Investigation and Design Studies of SOFC Electrode Performance at Elevated Pressure  

SciTech Connect (OSTI)

An experimental program was set forth to study fuel cell performance at pressure and under various compositions. Improvement in cathode electrode performance is on the order of 33-40% at pressures of 6.4 Bara compared to atmospheric pressure. Key cathode operational parameters are the concentration and partial pressure of O2, and temperature. The effect of partial pressure of oxygen (PO2) decreases the activation polarization, although there appears to be a secondary effect of absolute pressure as well. The concentration of oxygen impacts the diffusion component of the polarization, which is largely insensitive to absolute pressure. The effect of pressure was found to reduce the total polarization resistance of full fuel-cells beyond the reduction determined for the cathode alone. The total reduction in ASR was on the order of 0.10 ohm-cm2 for a pressure increase from 1 to 6.5 Bara, with about 70% of the improvement being realized from 1 to 4 Bara. An important finding was that there is an effect of steam on the cathode that is highly temperature dependent. The loss of performance at temperatures below 850 C was very large for the standard LSM + YSZ cathodes.

Ted Ohrn; Shung Ik Lee

2010-07-31T23:59:59.000Z

465

Thermoelectric Power of Germanium. Effect of 2000-atm Pressure  

Science Journals Connector (OSTI)

The effect of 2000-atm hydrostatic pressure on the thermoelectric power of n-and p-type germanium has been measured between 120 and 280°K. After spurious effects of heat conduction in the pressure medium were eliminated, the results could be explained in terms of pressure changes in the phonon-drag contribution.

P. J. Freud and G. M. Rothberg

1967-02-15T23:59:59.000Z

466

Measuring the pressures across microfluidic droplets with an optical tweezer  

E-Print Network [OSTI]

Measuring the pressures across microfluidic droplets with an optical tweezer Yuhang Jin,1 Antony a novel technique that enables pressure measurements to be made in microfluidic chips using optical trapping. Pressure differentials across droplets in a microfluidic channel are determined by monitoring

467

Pressure effects on lipids and bio-membrane assemblies  

Science Journals Connector (OSTI)

Pressure can play a key role in probing the structure and dynamics of membrane assemblies, and is also critical to the biology and adaptation of deep-sea organisms. This article presents an overview of the effect of pressure on the structure of membranes and recent developments in high-pressure instrumentation.

Brooks, N.J.

2014-09-23T23:59:59.000Z

468

Pressure Differential Analysis of a Laboratory Animal Room  

E-Print Network [OSTI]

differential can prevent air flow from a low pressure region to a high pressure region. We tested whether the differential pressure is reasonable to regulate the code between the indoors and outdoors, and among laboratory animal rooms, so as to provide a...

Jiang, X.; Liu, Z.; Yoshida, H.; Tang, B.

2006-01-01T23:59:59.000Z

469

Finite-Pressure-Gradient Influences on Ideal Spheromak Equilibrium  

Science Journals Connector (OSTI)

Spatially resolved measurements of the magnetic field of a spheromak have been analyzed and compared with expectations for the ratio of j?B from the pressure-gradient-free Taylor model and a model with pressure due to Morikawa. Better agreement is found with the model containing finite pressure.

G. W. Hart; C. Chin-Fatt; A. W. DeSilva; G. C. Goldenbaum; R. Hess; R. S. Shaw

1983-10-24T23:59:59.000Z

470

Northern Tool + Equipment Find the Right Fitting for Your Pressure Washer at Northern Tool! NorthernTool.com/PressureWashers Pristine Pressure Pressure/power washing in Maryland Vinyl siding cleaned, decks cleaned www.pristinepressure.com  

E-Print Network [OSTI]

ability to clean while saving on our most important resources, water and energy." In recognition! NorthernTool.com/PressureWashers Pristine Pressure Pressure/power washing in Maryland Vinyl siding cleaned, decks cleaned www.pristinepressure.com Siding Cleaning Bring back the life to your siding! Estimates

Sóbester, András

471

RF BREAKDOWN STUDIES USING PRESSURIZED CAVITIES  

SciTech Connect (OSTI)

Many present and future particle accelerators are limited by the maximum electric gradient and peak surface fields that can be realized in RF cavities. Despite considerable effort, a comprehensive theory of RF breakdown has not been achieved and mitigation techniques to improve practical maximum accelerating gradients have had only limited success. Part of the problem is that RF breakdown in an evacuated cavity involves a complex mixture of effects, which include the geometry, metallurgy, and surface preparation of the accelerating structures and the make-up and pressure of the residual gas in which plasmas form. Studies showed that high gradients can be achieved quickly in 805 MHz RF cavities pressurized with dense hydrogen gas, as needed for muon cooling channels, without the need for long conditioning times, even in the presence of strong external magnetic fields. This positive result was expected because the dense gas can practically eliminate dark currents and multipacting. In this project we used this high pressure technique to suppress effects of residual vacuum and geometry that are found in evacuated cavities in order to isolate and study the role of the metallic surfaces in RF cavity breakdown as a function of magnetic field, frequency, and surface preparation. One of the interesting and useful outcomes of this project was the unanticipated collaborations with LANL and Fermilab that led to new insights as to the operation of evacuated normal-conducting RF cavities in high external magnetic fields. Other accomplishments included: (1) RF breakdown experiments to test the effects of SF6 dopant in H2 and He gases with Sn, Al, and Cu electrodes were carried out in an 805 MHz cavity and compared to calculations and computer simulations. The heavy corrosion caused by the SF6 components led to the suggestion that a small admixture of oxygen, instead of SF6, to the hydrogen would allow the same advantages without the corrosion in a practical muon beam line. (2) A 1.3 GHz RF test cell capable of operating both at high pressure and in vacuum with replaceable electrodes was designed, built, and power tested in preparation for testing the frequency and geometry effects of RF breakdown at Argonne National Lab. At the time of this report this cavity is still waiting for the 1.3 GHz klystron to be available at the Wakefield Test Facility. (3) Under a contract with Los Alamos National Lab, an 805 MHz RF test cavity, known as the All-Seasons Cavity (ASC), was designed and built by Muons, Inc. to operate either at high pressure or under vacuum. The LANL project to use the (ASC) was cancelled and the testing of the cavity has been continued under the grant reported on here using the Fermilab Mucool Test Area (MTA). The ASC is a true pillbox cavity that has performed under vacuum in high external magnetic field better than any other and has demonstrated that the high required accelerating gradients for many muon cooling beam line designs are possible. (4) Under ongoing support from the Muon Acceleration Program, microscopic surface analysis and computer simulations have been used to develop models of RF breakdown that apply to both pressurized and vacuum cavities. The understanding of RF breakdown will lead to better designs of RF cavities for many applications. An increase in the operating accelerating gradient, improved reliability and shorter conditioning times can generate very significant cost savings in many accelerator projects.

Johnson, Rolland

2014-09-21T23:59:59.000Z

472

High-pressure coal fuel processor development  

SciTech Connect (OSTI)

The objective of Subtask 1.1 Engine Feasibility was to conduct research needed to establish the technical feasibility of ignition and stable combustion of directly injected, 3,000 psi, low-Btu gas with glow plug ignition assist at diesel engine compression ratios. This objective was accomplished by designing, fabricating, testing and analyzing the combustion performance of synthesized low-Btu coal gas in a single-cylinder test engine combustion rig located at the Caterpillar Technical Center engine lab in Mossville, Illinois. The objective of Subtask 1.2 Fuel Processor Feasibility was to conduct research needed to establish the technical feasibility of air-blown, fixed-bed, high-pressure coal fuel processing at up to 3,000 psi operating pressure, incorporating in-bed sulfur and particulate capture. This objective was accomplished by designing, fabricating, testing and analyzing the performance of bench-scale processors located at Coal Technology Corporation (subcontractor) facilities in Bristol, Virginia. These two subtasks were carried out at widely separated locations and will be discussed in separate sections of this report. They were, however, independent in that the composition of the synthetic coal gas used to fuel the combustion rig was adjusted to reflect the range of exit gas compositions being produced on the fuel processor rig. Two major conclusions resulted from this task. First, direct injected, ignition assisted Diesel cycle engine combustion systems can be suitably modified to efficiently utilize these low-Btu gas fuels. Second, high pressure gasification of selected run-of-the-mine coals in batch-loaded fuel processors is feasible. These two findings, taken together, significantly reduce the perceived technical risks associated with the further development of the proposed coal gas fueled Diesel cycle power plant concept.

Greenhalgh, M.L.

1992-11-01T23:59:59.000Z

473

Hyperosmolar Therapy for Raised Intracranial Pressure  

Science Journals Connector (OSTI)

...undertaken. Attempts to decompress the cranial contents by removing parts of the skull after traumatic brain injury have lowered intracranial pressure but have not improved the outcome, as compared with standard care. Several other interventions, in addition to hyperosmolar therapy, may be useful in the management... Foreword This Journal feature begins with a case vignette that includes a therapeutic recommendation. A discussion of the clinical problem and the mechanism of benefit of this form of therapy follows. Major clinical studies, the clinical use of this ...

Ropper A.H.

2012-08-23T23:59:59.000Z

474

Multidimensional gravitational model with anisotropic pressure  

E-Print Network [OSTI]

We consider the gravitational model with additional spatial dimensions and anisotropic pressure which is nonzero only in these dimensions. Cosmological solutions in this model include accelerated expansion of the Universe at late age of its evolution and dynamical compactification of extra dimensions. This model describes observational data for Type Ia supernovae on the level or better than the $\\Lambda$CDM model. We analyze two equations of state resulting in different predictions for further evolution, but in both variants the acceleration epoch is finite.

O. A. Grigorieva; G. S. Sharov

2014-02-18T23:59:59.000Z

475

Combustor oscillating pressure stabilization and method  

DOE Patents [OSTI]

High dynamic pressure oscillations in hydrocarbon-fueled combustors typically occur when the transport time of the fuel to the flame front is at some fraction of the acoustic period. These oscillations are reduced to acceptably lower levels by restructuring or repositioning the flame front in the combustor to increase the transport time. A pilot flame front located upstream of the oscillating flame and pulsed at a selected frequency and duration effectively restructures and repositions the oscillating flame in the combustor to alter the oscillation-causing transport time.

Gemmen, Randall S. (Morgantown, WV); Richards, George A. (Morgantown, WV); Yip, Mui-Tong Joseph (Morgantown, WV); Robey, Edward H. (Westover, WV); Cully, Scott R. (Morgantown, WV); Addis, Richard E. (Smithfield, PA)

1998-01-01T23:59:59.000Z

476

Second-generation pressurized fluidized bed combustion  

SciTech Connect (OSTI)

Under the sponsorship of the United States Department of Energy, Foster Wheeler Corporation is developing second-generation pressurized fluidized bed combustion (PFBC) power plant technology that will enable this type of plant to operate with net plant efficiencies in the range of 43 to 46 percent (based on the higher heating value of the coal), with a reduction in the cost of electricity of at least 20 percent. A three-phase program is under way. Its scope encompasses the conceptual design of a commercial plant through the process of gathering needed experimental test data to obtain design parameters.

Wolowodiuk, W.; Robertson, A.

1992-01-01T23:59:59.000Z

477

Second-generation pressurized fluidized bed combustion  

SciTech Connect (OSTI)

Under the sponsorship of the United States Department of Energy, Foster Wheeler Corporation is developing second-generation pressurized fluidized bed combustion (PFBC) power plant technology that will enable this type of plant to operate with net plant efficiencies in the range of 43 to 46 percent (based on the higher heating value of the coal), with a reduction in the cost of electricity of at least 20 percent. A three-phase program is under way. Its scope encompasses the conceptual design of a commercial plant through the process of gathering needed experimental test data to obtain design parameters.

Wolowodiuk, W.; Robertson, A.

1992-05-01T23:59:59.000Z

478

High-pressure liquid chromatographic gradient mixer  

DOE Patents [OSTI]

A gradient mixer effects the continuous mixing of any two miscible solvents without excessive decay or dispersion of the resultant isocratic effluent or of a linear or exponential gradient. The two solvents are fed under low or high pressure by means of two high performance liquid chromatographic pumps. The mixer comprises a series of ultra-low dead volume stainless steel tubes and low dead volume chambers. The two solvent streams impinge head-on at high fluxes. This initial nonhomogeneous mixture is then passed through a chamber packed with spirally-wound wires which cause turbulent mixing thereby homogenizing the mixture with minimum band-broadening.

Daughton, C.G.; Sakaji, R.H.

1982-09-08T23:59:59.000Z

479

HIGH PRESSURE COAL COMBUSTION KINETICS PROJECT  

SciTech Connect (OSTI)

SRI has completed the NBFZ test program, made modification to the experimental furnace for the HPBO test. The NBFZ datasets provide the information NEA needs to simulate the combustion and fuel-N conversion with detailed chemical reaction mechanisms. BU has determined a linear swell of 1.55 corresponding to a volumetric increase of a factor of 3.7 and a decrease in char density by the same factor. These results are highly significant, and indicate significantly faster burnout at elevated pressure due to the low char density and large diameter.

Chris Guenther, Ph.D.

2003-01-28T23:59:59.000Z

480

Effect of Pressure Transmission Lines on the Frequency Response of Pressure Transducers  

SciTech Connect (OSTI)

It is well known that the length and diameter of the transmission lines between a pressure transducer and the pressure source can significantly affect the dynamic frequency response of the transducer. A new lumped parameter model has been developed to predict the time and frequency response of any number of different transducers connected in parallel in a manifold. While the model is simple to apply, it can provide quantitative information given the transducer and transmission line characteristic parameters. More importantly, the model can be used to evaluate the measured, in-situ response. this provides the natural frequency and the effective damping which can then be used to generate a frequency response curve. The model is also useful for designing a new pressure transmission system, which will have the required frequency response. The model was qualified by comparison to measurements of the step-function pressure response of a number of different transducers and test installations. With the aid of the model, the system resonant frequency and damping can be determined. Additional damping can be added if necessary to prevent ringing of the signal and to assure an accurate pressure measurement with a flat frequency response. For all of the experimental systems evaluated in this work, the response at the natural frequency was significantly underdamped and ringing was observed. This means that to perform accurate measurements damping needs to be added to the system. It was observed that the use of flexible pressure lines versus hard lines does increase the damping and may therefore be useful in certain situations. Equations were developed to permit sizing an orifice to be added to the system to provide the necessary damping.

G.J. Kirouac

2000-11-13T23:59:59.000Z

Note: This page contains sample records for the topic "atmospheric pressure pressure" 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

An In-situ Tensile Test Apparatus for Polymers in High Pressure Hydrogen  

SciTech Connect (OSTI)

Degradation of material properties by high-pressure hydrogen is an important factor in determining the safety and reliability of materials used in high-pressure hydrogen storage and delivery. Hydrogen damage mechanisms have a time dependence that is linked to hydrogen outgassing after exposure to the hydrogen atmosphere that makes ex-situ measurements of mechanical properties problematic. Designing in-situ measurement instruments for high-pressure hydrogen is challenging due to known hydrogen incompatibility with many metals and standard high-power motor materials like Nd. Here we detail the design and operation of a solenoid based in-situ tensile tester under high-pressure hydrogen environments up to 5,000 psi. Modulus data from high-density polyethylene (HDPE) samples tested under high-pressure hydrogen are also reported as compared to baseline measurements taken in air.

Alvine, Kyle J.; Kafentzis, Tyler A.; Pitman, Stan G.; Johnson, Kenneth I.; Skorski, Daniel C.; Tucker, Joseph C.; Roosendaal, Timothy J.; Dahl, Michael E.

2014-10-10T23:59:59.000Z

482

An in situ tensile test apparatus for polymers in high pressure hydrogen  

SciTech Connect (OSTI)

Degradation of material properties by high-pressure hydrogen is an important factor in determining the safety and reliability of materials used in high-pressure hydrogen storage and delivery. Hydrogen damage mechanisms have a time dependence that is linked to hydrogen outgassing after exposure to the hydrogen atmosphere that makes ex situ measurements of mechanical properties problematic. Designing in situ measurement instruments for high-pressure hydrogen is challenging due to known hydrogen incompatibility with many metals and standard high-power motor materials such as Nd. Here we detail the design and operation of a solenoid based in situ tensile tester under high-pressure hydrogen environments up to 42 MPa (6000 psi). Modulus data from high-density polyethylene samples tested under high-pressure hydrogen at 35 MPa (5000 psi) are also reported as compared to baseline measurements taken in air.

Alvine, K. J., E-mail: kyle.alvine@pnnl.gov; Kafentzis, T. A.; Pitman, S. G.; Johnson, K. I.; Skorski, D.; Tucker, J. C.; Roosendaal, T. J.; Dahl, M. E. [Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354 (United States)

2014-10-15T23:59:59.000Z

483

Fundamentals of High Pressure Combustion Chapter in High Pressure Processes in Chemical Engineering, Edited by Maximillian Lackner,  

E-Print Network [OSTI]

Fundamentals of High Pressure Combustion Chapter in High Pressure Processes in Chemical Engineering for more than 50 years and are expected to continue to do so [2]. Diesel engines obtain pressures as large as 60atm after ignition [3, 4, 5, 6, 7]. Figure 1 presents a schematic of diesel and gas turbine engine

Miller, Richard S.

484

Guidelines for Testing Pressure Canner Gauges County Extension Agents have offered annual pressure canner testing clinics so clientele  

E-Print Network [OSTI]

Guidelines for Testing Pressure Canner Gauges County Extension Agents have offered annual pressure canner testing clinics so clientele can get their dial gauges tested yearly ­ a practice strongly guidelines for pressure canner testing that have been established by the National Center for Home Food

485

Development of Screenable Pressure Sensitive Adhesives  

SciTech Connect (OSTI)

An industrial research area of high activity in recent years has been the development of pressure sensitive adhesive (PSA) products that do not interfere with the processing of post-consumer waste. The problem of PSA contamination is arguably the most important technical challenge in expanding the use of recycled fiber. The presence of PSAs in recovered paper creates problems that reduce the efficiency of recycling and papermaking operations and diminish product quality. The widespread use of PSAs engineered to avoid these problems, often referred to as environmentally benign PSAs, could greatly increase the commercial viability of utilizing secondary fiber. Much of the research efforts in this area have focused on the development of PSAs that are designed for enhanced removal with cleaning equipment currently utilized by recycling plants. Most removal occurs at the pressure screens with the size and shape of residual contaminants in the process being the primary criteria for their separation. A viable approach for developing environmentally benign PSAs is their reformulation to inhibit fragmentation. The reduction of adhesives to small particles occurs almost exclusively during repulping; a process in which water and mechanical energy are used to swell and reduce paper products to their constituent fiber. Engineering PSA products to promote the formation of larger adhesive particles during repulping will greatly enhance their removal and reduce or eliminate their impact on the recycling process.

Steven J. Severtson

2003-11-29T23:59:59.000Z

486

Radiation effects on reactor pressure vessel supports  

SciTech Connect (OSTI)

The purpose of this report is to present the findings from the work done in accordance with the Task Action Plan developed to resolve the Nuclear Regulatory Commission (NRC) Generic Safety Issue No. 15, (GSI-15). GSI-15 was established to evaluate the potential for low-temperature, low-flux-level neutron irradiation to embrittle reactor pressure vessel (RPV) supports to the point of compromising plant safety. An evaluation of surveillance samples from the High Flux Isotope Reactor (HFIR) at the Oak Ridge National Laboratory (ORNL) had suggested that some materials used for RPV supports in pressurized-water reactors could exhibit higher than expected embrittlement rates. However, further tests designed to evaluate the applicability of the HFIR data to reactor RPV supports under operating conditions led to the conclusion that RPV supports could be evaluated using traditional method. It was found that the unique HFIR radiation environment allowed the gamma radiation to contribute significantly to the embrittlement. The shielding provided by the thick steel RPV shell ensures that degradation of RPV supports from gamma irradiation is improbable or minimal. The findings reported herein were used, in part, as the basis for technical resolution of the issue.

Johnson, R.E. [Nuclear Regulatory Commission, Washington, DC (United States). Div. of Engineering Technology; Lipinski, R.E. [Idaho National Engineering Lab., Rockville, MD (United States)

1996-05-01T23:59:59.000Z

487

Real-time Combustion Control and Diagnostics Sensor-Pressure Oscillation Monitor  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Combustion Control and Diagnostics Combustion Control and Diagnostics Sensor-Pressure Oscillation Monitor Opportunity The Department of Energy's National Energy Technology Laboratory (NETL) is seeking licensing partners interested in implementing its patented "Real-Time Combustion Control and Diagnostics Sensor-Pressure Oscillation Monitor" technology. Disclosed is NETL's sensor system and process for monitoring and controlling the amplitude and/or frequencies of dynamic pressure oscillations in combustion systems during active combustion processes. The combustion control and diagnostics sensor (CCADS) is designed for gas turbine combustors that are operated near the fuel-lean flame extinction limit to minimize production of the atmospheric pollutant NOx. CCADS eliminates the problems of flashback,

488

Chapter 9 - Vacuum and High-Pressure Distillation  

Science Journals Connector (OSTI)

Abstract In industrial practice, multistage distillation operations are carried out over a wide range of operating pressures, from about 0.1 to 40 bar (10,000 to 40·105 Pa). Major factors in choosing the operating pressure are the temperatures of the available cooling and heating media, with water and low-pressure steam being the most convenient ones. Volatile materials require high pressure to raise their condensation temperature to the desired level. Relative volatility tends to decrease with increasing pressure, and, thermodynamically, the upper limit is the critical temperature of the components in the feed. In such cases, a lower operating pressure is chosen and refrigeration must be employed for condensation of overhead vapor instead of cooling water or air. When dealing with high-boiling material, the upper limit for setting the operating pressure depends on the heat sensitivity of the bottom product components. This often requires distilling under an appropriate vacuum in conjunction with a low enough pressure drop to reduce the column bottom temperature accordingly. From the column design point of view, the operating pressure dictates to a great extent the choice and design of internals, and it influences significantly their functionality and overall performance. The main objective of the present chapter is to address and discuss operating pressure selection criteria as well as pressure effects on stage and reflux requirement, vapor and liquid properties, distillation p