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1

Electrostatic Precipitator Reference Manual  

Science Conference Proceedings (OSTI)

This manual reviews the history of electrostatic precipitators (ESPs) and the theory on which they are based. The chemical and physical properties of fly ash are detailed, and practical guidelines for the selection of ESP design and size are presented. Special attention is given to operating and performance problem diagnostics, and trends in the design and application of ESPs are discussed.

1982-12-01T23:59:59.000Z

2

Survey of Wet Electrostatic Precipitators  

Science Conference Proceedings (OSTI)

Wet electrostatic precipitators (ESPs) have found application since they were first installed for sulfuric acid collection on a smelter and patented by Dr. Frederick Cottrell in 1907–1908. Power generation applications typically use dry ESPs for collection of coal fly ash in nonsaturated flue gas streams. This report summarizes the physical installations, specifications, operating environments, and operational experience of wet ESPs currently operating in the United States on power generation ...

2012-12-31T23:59:59.000Z

3

Guidelines for Upgrading Electrostatic Precipitator Performance: Electrostatic Precipitator Upgrade Options  

Science Conference Proceedings (OSTI)

This guide, the second volume of a two-volume set, presents an analytical procedure to evaluate cost-effective options for enhancing the performance of an existing electrostatic precipitator (ESP) when the performance of the ESP, even after optimization, is not satisfactory. The guide focuses on ESPs that require significant improvements (more than $20/kW) to achieve their emissions goals. The first volume of this report, published in September 1999, treated low-cost options that could be used to optimiz...

1999-12-13T23:59:59.000Z

4

Electrostatic Precipitator Guidelines, Volumes 1-3  

Science Conference Proceedings (OSTI)

In summarizing the latest information on electrostatic precipitator technologies, these three volumes make up a central utility reference source. Plant engineers and operators will find in it detailed guidelines for preparing precipitator design specifications, for planning and conducting operations and maintenance programs, and for troubleshooting problem precipitators.

1987-07-01T23:59:59.000Z

5

Parametric testing of coal electrostatic precipitator performance  

Science Conference Proceedings (OSTI)

The effect of internal geometry, electrode type, and operating conditions on the performance of a coal electrostatic precipitator (ESP) has been analyzed by means of an extensive parametric testing program. Tests under different conditions of plate spacing, discharge electrodes, gas velocity, and energization wave form have been performed using two extreme coal types, with very high and low resistivity ashes, respectively. The study was made by means of a pilot installation operating with a flue gas slipstream drawn upstream of a power plant ESP. The experimental plant includes a specifically designed pilot ESP, able to admit an internal modification of plate spacing and electrode type. The ESP is equipped with a microprocessor controlled power supply which can generate both continuous and intermittent rectified current. The measured sensitivity of the precipitation process to the dust properties, filter configuration, electrode type, and energization method is presented, covering both the ESP efficiency evolution and the associated power consumption. The results of this work allow to extract practical conclusions about specification of ESP design and size for a given application, and assess the conditions in which use of wide plate spacing, new electrode geometries, or intermittent current are actually advantageous. 11 refs., 6 figs., 5 tabs.

Canadas, L.; Navarrete, B.; Ollero, P.; Salvador, L. [Universidad de Sevilla (Spain)

1997-12-31T23:59:59.000Z

6

Automatic control and management of electrostatic precipitator  

Science Conference Proceedings (OSTI)

The efficient operation of an electrostatic precipitator (ESP) in practice depends upon many variables, such as charging method, particle size, gas flow, temperature, dust resistivity, etc. With the air pollution control requirements becoming increasingly stringent, it is essential to closely monitor and accurately control the key parameters of an ESP control system. The efficient functioning of an ESP normally means minimizing power consumption and maximizing dust collection. Several control strategies can be adopted to meet this broad requirement. In this paper, a distributed control technique of an ESP, which uses the actual dust emission and boiler load as feedback inputs has been explained. The Electrostatic Precipitator Management System, which is a system designed by Bharat Heavy Electricals Ltd., Hyderabad, India, to meet the above control strategies using the distributed architecture to achieve efficient ESP operation is also described.

Durga Prasad, N.V.P.R.; Lakshminarayana, T.; Narasimham, J.R.K.; Verman, T.M.; Krishnam Raju, C.S.R. [Bharat Heavy Electricals Ltd., Hyderabad (India). Programmable Control Systems Lab.

1999-05-01T23:59:59.000Z

7

Advanced Electrostatic Precipitator (ESP) Power Supplies Update  

Science Conference Proceedings (OSTI)

Manufacturers of new, high-frequency power supplies for electrostatic precipitators (ESPs) have continued to push the development of this technology steadily forward since the last EPRI report on the subject was published. The capacity of these new power supplies continues to grow and the reliability issues identified in the early applications are being steadily resolved. This report contains a description of the technology behind the new power supplies and an update on recent applications and future pla...

2006-03-27T23:59:59.000Z

8

Guidelines for Upgrading Electrostatic Precipitator Performance: Volume 1: Optimizing an Existing Electrostatic Precipitator  

Science Conference Proceedings (OSTI)

The first of a two-volume set, this guide presents a systematic procedure to optimize a chronically under-performing electrostatic precipitator (ESP) without conducting a major upgrade. The guide focuses on ESPs that require only moderate improvements (less than $10-$20/kW) to achieve their emissions goals. The second volume of this report, which will appear at the end of 1999, will cover more extensive upgrades, as well as flue gas conditioning.

1999-09-28T23:59:59.000Z

9

Electrostatic precipitators vs. fabric filters: A symposium and debate  

SciTech Connect

Nine papers were presented at the Electrostatic Precipitators vs. Fabric Filters: A Symposium and Debate held March 22, 1994 at the Sheraton Crystal City Hotel in Arlington, Virginia. The Symposium was intended to take a frank look at the comparative advantages of electrostatic precipitators and fabric filters. A separate abstract was prepared for each paper for inclusion in the Energy Science and Technology Database.

1994-12-31T23:59:59.000Z

10

State-of-the-Art Electrostatic Precipitator Power Supplies  

Science Conference Proceedings (OSTI)

New electrostatic precipitator (ESP) power supply controls are available that can significantly enhance the performance of precipitators. These controls are capable of intermittent energization and bad corona detection, as well as ESP data archiving and performance troubleshooting. Furthermore, a new generation of power supplies for electrostatic precipitators is now on the market. These new high frequency supplies are smaller and lighter than the 60 hertz transformer – rectifier power supplies the...

2003-10-28T23:59:59.000Z

11

Electrostatic precipitation of condensed acid mist  

Science Conference Proceedings (OSTI)

This project addresses the acid mist that is formed by condensation of sulfuric acid vapor in flue gas from coal-fired utility boilers. An acid mist can be formed whenever the flue gas temperature approaches the prevailing acid dew point. This commonly occurs when the gas is subjected to rapid adiabatic cooling in a wet scrubber system for flue gas desulfurization. Acid mists can also sometimes result from unexpected temperature excursions caused by air inleakage, load cycling, and start-up operations. A wet electrostatic precipitator (WESP) is the best control option for acid mist. The mist would blind a fabric filter and attack glass fiber fabrics. A wet ESP is required because the acid would quickly corrode the plates in a conventional dry ESP. The wet ESP also offers the advantages of no rapping reentrainment and no sensitivity to fly ash resistivity. Therefore, this program has been structured around the use of a compact, wet ESP to control acid mist emissions. 7 refs.

Not Available

1990-01-01T23:59:59.000Z

12

Membrane-based wet electrostatic precipitation  

Science Conference Proceedings (OSTI)

Emissions of fine particulate matter, PM2.5, in both primary and secondary form, are difficult to capture in typical dry electrostatic precipitators (ESPs). Wet (or waterbased) ESPs are well suited for collection of acid aerosols and fine particulates because of greater corona power and virtually no re-entrainment. However, field disruptions because of spraying (misting) of water, formation of dry spots (channeling), and collector surface corrosion limit the applicability of current wet ESPs in the control of secondary PM2.5. Researchers at Ohio University have patented novel membrane collection surfaces to address these problems. Water-based cleaning in membrane collectors made of corrosion-resistant fibers is facilitated by capillary action between the fibers, maintaining an even distribution of water. This paper presents collection efficiency results of lab-scale and pilot-scale testing at First Energy's Bruce Mansfield Plant for the membrane-based wet ESP. The data indicate that a membrane wet ESP was more effective at collecting fine particulates, acid aerosols, and oxidized mercury than the metal-plate wet ESP, even with {approximately}15% less collecting area. 15 refs., 7 figs., 6 tabs.

David J. Bayless; Liming Shi; Gregory Kremer; Ben J. Stuart; James Reynolds; John Caine [Ohio University, Athens, OH (US). Ohio Coal Research Center

2005-06-01T23:59:59.000Z

13

Electrostatic precipitation of condensed acid mist  

Science Conference Proceedings (OSTI)

The purpose of this project is to develop and demonstrate a compact, wet electrostatic collector for condensed acid mist in power plant flue gas. The following are project objectives: (1) fabrication of laboratory-version of the WESP; (2) optimization of the WESP performance through laboratory tests with a non-volatile simulant aerosol having a size distribution similar to the acid mist; (3) demonstration of adequate collection of actual acid mist in a pilot coal combustion facility under conditions simulating full-scale power plant burning high-sulfur coal; (4) development of computer model of the WESP process must be developed to assist in the process optimization, interpretation of test results, and extrapolation to full scale; and (5) solicitation of utility participation in a follow-on demonstration of the WESP concept at a full-scale power plant. The WESP fabrication, laboratory and pilot combustor testing, and computer modeling is discussed. 5 refs., 5 figs.

Not Available

1989-01-01T23:59:59.000Z

14

Water Treatment For Wet Electrostatic Precipitators: Conceptual Design  

Science Conference Proceedings (OSTI)

Pilot testing has shown that replacement of the last field of a small dry electrostatic precipitator (ESP) with a single wet field can significantly reduce outlet particulate emissions from coal-fired power plants. This report summarizes a pilot wet ESP performance test, cost projections from an economic study, and results from a study of the water use and chemistry issues that need to be resolved to make the wet ESP technology an attractive option for electric utilities.

1997-09-25T23:59:59.000Z

15

Assessment of Electrostatic Precipitator (ESP) Upgrade Options: Survey and Analysis  

Science Conference Proceedings (OSTI)

The electrostatic precipitator (ESP) performance analysis in this interim report is intended to aid in selection of the most effective upgrade technologies, which are identified and discussed in EPRI report 1023077, ESP Performance Optimization. This second in a series of reports contains a new, first-order procedure for evaluating the performance of an existing ESP in order to determine which of the technologies discussed in the earlier report will produce the greatest improvement in ...

2013-06-15T23:59:59.000Z

16

State-of-the-Art Power Supplies for Electrostatic Precipitators  

Science Conference Proceedings (OSTI)

As a part of an equipment update to the hot-side electrostatic precipitator (ESP) on Unit 2 at Mississippi Power Company's Plant Lansing Smith, the 60-Hz power supplies were replaced with high- frequency power supplies provided by NWL. This report contains a summary of data acquired during this first application of high-frequency power supplies on hot-side ESPs. These smaller, lighter power supplies have advanced to the point where they can now take advantage of the operational flexibility inherent in th...

2005-09-29T23:59:59.000Z

17

Electrostatic Precipitator Maintenance Guide: Volume 1: Volume 1 of a Two-Volume Set (E213676)  

Science Conference Proceedings (OSTI)

The "Electrostatic Precipitator Maintenance Guide" is directed towards electrical and maintenance personnel who maintain the electrostatic precipitator (ESP) and troubleshoot problems that occur during operation. The intent of this guide is to give plant personnel guidelines for maintaining an ESP for reliable operation.

2003-02-07T23:59:59.000Z

18

Electrostatic Precipitator Maintenance Guide: Volume 2: Volume 2 of a Two-Volume Set (E213676)  

Science Conference Proceedings (OSTI)

The "Electrostatic Precipitator Maintenance Guide" is directed towards electrical and maintenance personnel who maintain the electrostatic precipitator (ESP) and troubleshoot problems that occur during operation. The intent of this guide is to give plant personnel guidelines for maintaining an ESP for reliable operation.

2003-02-07T23:59:59.000Z

19

Electrostatic Precipitator Performance Modeling of High Carbon Ash Using EPRI's ESPM  

Science Conference Proceedings (OSTI)

To meet reduced nitrogen oxide (NOX) emission limits, many power producers installed low-NOX combustion systems that raised the level of carbon in the ash. However, carbon can be difficult to collect in an electrostatic precipitator and, consequently, the particulate emissions from many affected units increased. EPRI initiated this study to better understand carbon capture in electrostatic precipitators (ESPs), improve collection of high carbon ashes, and predict the collection of such ashes with its ESP...

2007-03-19T23:59:59.000Z

20

MULTI-POLLUTANT CONTROL USING MEMBRANE-BASED UP-FLOW WET ELECTROSTATIC PRECIPITATION  

SciTech Connect

This is the first quarterly report of the ''Multi-Pollutant Control Using Membrane--Based Upflow Wet Electrostatic Precipitation'' project funded by the US Department of Energy's National Energy Technology Laboratory under DOE Award No. DE-FC26-02NT41592 to Croll-Reynolds Clean Air Technologies (CRCAT). In this 18 month project, CRCAT and its team members will conduct detailed emission tests of metallic and new membrane collection material within a wet electrostatic precipitator (WESP) at First Energy's Penn Power's Bruce Mansfield (BMP) plant in Shippingport, Pa. Test results performed on the existing metallic WESP during November of 2002 showed consistent results with previous test results. Average collection efficiency of 89% on SO{sub 3} mist was achieved. Additionally, removal efficiencies of 62% were achieved at very high velocity, greater than 15 ft./sec.

James Reynolds

2003-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "include electrostatic precipitators" 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

A Study of Activated Carbon Re-Entrainment from Electrostatic Precipitators  

Science Conference Proceedings (OSTI)

This report describes the research and findings from a study of the ability of several coal-fired units to capture carbon species, in particular, powdered activated carbon (PAC) injection for mercury capture, by various configurations of electrostatic precipitators (ESPs) and associated ductwork. The varied nature of the units studied offers a range of examples, indicating potential problems, solutions, and the projected performance of other units by association. Wide variations in ESP collection efficie...

2010-06-30T23:59:59.000Z

22

Advanced Power Supply Demonstration: High Frequency Power Supplies for Electrostatic Precipitator (ESP) Applications  

Science Conference Proceedings (OSTI)

New, high frequency supplies to power electrostatic precipitators (ESPs) are being introduced to the utility industry. These power supplies are smaller, lighter, and more versatile than the 60-Hz supplies they replace. As with so many new technologies, a number of problems have been encountered in some of the early applications. This report describes the principles of operation, the advantages and disadvantages, and the state of development of the new technology.

2004-03-23T23:59:59.000Z

23

Retrofit of waste-to-energy facilities equipped with electrostatic precipitators. Volume II: Field and laboratory reports, Part 2 of 2  

DOE Green Energy (OSTI)

Volume II (part 2 of 2) of ''Retrofit of Waste-to-energy Facilities Equipped with Electrostatic Precipitators'' contains the field and laboratory reports, including: (1) field reports, (2) analytic laboratory reports, (3) chain of custody forms, and (4) TCLP laboratory reports.

Rigo, H.G. [Rigo & Rigo Associates, Inc., Berea, OH (US); Chandler, A.J. [A.J. Chandler & Associates, Ltd., Toronto, Ontario (Canada)

1996-04-01T23:59:59.000Z

24

Retrofit of waste-to-energy facilities equipped with electrostatic precipitators. Volume II: Field and Laboratory Reports, Part 1 of 2  

DOE Green Energy (OSTI)

Volume II (part 1 of 2) of ''Retrofit of Waste-to-energy Facilities Equipped with Electrostatic Precipitators'' contains the documentation and raw data, including: (1) field reports, (2) analytic laboratory reports, (3) chain of custody forms, and (4) TCLP laboratory reports.

Rigo, H.G. [Rigo & Rigo Associates, Inc., Berea, OH (US); Chandler, A.J. [A.J. Chandler & Associates, Ltd., Toronto, Ontario (Canada)

1996-04-01T23:59:59.000Z

25

Mercury capture within coal-fired power plant electrostatic precipitators: model evaluation  

Science Conference Proceedings (OSTI)

Efforts to reduce anthropogenic mercury emissions worldwide have recently focused on a variety of sources, including mercury emitted during coal combustion. Toward that end, much research has been ongoing seeking to develop new processes for reducing coal combustion mercury emissions. Among air pollution control processes that can be applied to coal-fired boilers, electrostatic precipitators (ESPs) are by far the most common, both on a global scale and among the principal countries of India, China, and the U.S. that burn coal for electric power generation. A previously reported theoretical model of in-flight mercury capture within ESPs is herein evaluated against data from a number of full-scale tests of activated carbon injection for mercury emissions control. By using the established particle size distribution of the activated carbon and actual or estimated values of its equilibrium mercury adsorption capacity, the incremental reduction in mercury concentration across each ESP can be predicted and compared to experimental results. Because the model does not incorporate kinetics associated with gas-phase mercury transformation or surface adsorption, the model predictions represent the mass-transfer-limited performance. Comparing field data to model results reveals many facilities performing at or near the predicted mass-transfer-limited maximum, particularly at low rates of sorbent injection. Where agreement is poor between field data and model predictions, additional chemical or physical phenomena may be responsible for reducing mercury removal efficiencies. 26 refs., 5 figs., 1 tab.

Clack, H.L. [Illinois Institute of Technology, Chicago, IL (United States). Department of Mechanical, Materials and Aerospace Engineering

2009-03-01T23:59:59.000Z

26

Influence of the inlet velocity profiles on the prediction of velocity distribution inside an electrostatic precipitator  

SciTech Connect

The influence of the velocity profile at the inlet boundary on the simulation of air velocity distribution inside an electrostatic precipitator is presented in this study. Measurements and simulations were performed in a duct and an electrostatic precipitator (ESP). A four-hole cobra probe was used for the measurement of velocity distribution. The flow simulation was performed by using the computational fluid dynamics (CFD) code FLUENT. Numerical calculations for the air flow were carried out by solving the Reynolds-averaged Navier-Stokes equations coupled with the realizable k-{epsilon} turbulence model equations. Simulations were performed with two different velocity profiles at the inlet boundary - one with a uniform (ideal) velocity profile and the other with a non-uniform (real) velocity profile to demonstrate the effect of velocity inlet boundary condition on the flow simulation results inside an ESP. The real velocity profile was obtained from the velocity measured at different points of the inlet boundary whereas the ideal velocity profile was obtained by calculating the mean value of the measured data. Simulation with the real velocity profile at the inlet boundary was found to predict better the velocity distribution inside the ESP suggesting that an experimentally measured velocity profile could be used as velocity inlet boundary condition for an accurate numerical simulation of the ESP. (author)

Haque, Shah M.E.; Deev, A.V.; Subaschandar, N. [Process Engineering and Light Metals (PELM) Centre, Faculty of Sciences, Engineering and Health, Central Queensland University, Gladstone, Queensland 4680 (Australia); Rasul, M.G.; Khan, M.M.K. [College of Engineering and Built Environment, Faculty of Sciences, Engineering and Health, Central Queensland University, Rockhampton, Queensland 4702 (Australia)

2009-01-15T23:59:59.000Z

27

MULTI-POLLUTANT CONTROL USING MEMBRANE--BASED UP-FLOW WET ELECTROSTATIC PRECIPITATION  

SciTech Connect

This is the Final Report of the ''Multi-Pollutant Control Using Membrane-Based Up-flow Wet Electrostatic Precipitation'' project funded by the US Department of Energy's National Energy Technology Laboratory under DOE Award No. DE-FC26-02NT41592 to Croll-Reynolds Clean Air Technologies (CRCAT). In this 18 month project, CRCAT and its team members conducted detailed emission tests of metallic and new membrane collection material within a wet electrostatic precipitator (WESP) at First Energy's Penn Power's Bruce Mansfield (BMP) plant in Shippingport, Pa. The Membrane WESP was designed to be as similar as the metallic WESP in terms of collection area, air-flow, and electrical characteristics. Both units are two-field units. The membrane unit was installed during the 2nd and 3rd quarters of 2003. Testing of the metallic unit was performed to create a baseline since the Mansfield plant had installed selective catalytic reduction equipment for NOx control and a sodium bisulfate injection system for SO3 control during the spring of 2003. Tests results on the metallic WESP were consistent with previous testing for PM2.5, SO3 mist and mercury. Testing on the membrane WESP demonstrated no adverse impact and equivalent removal efficiencies as that of the metallic WESP. Testing on both units was performed at 8,000 acfm and 15,000 acfm. Summary results are shown.

James Reynolds

2004-10-29T23:59:59.000Z

28

Two-stage-type electrostatic precipitator re-entrainment phenomena under diesel flue gases  

Science Conference Proceedings (OSTI)

One of the applications of the electrostatic precipitator (ESP) is the cleaning of air to increase the visibility index in highway tunnels. Particles floating in air in highway tunnels are mainly carbon. Collection efficiency of a large particle diameter in an ESP often decreases when the ESP collects carbon particles which have low electric resistance. Collection efficiency often becomes negative in an experimental ESP. The negative collection efficiency means that the particle concentration flowing downstream is greater than that upstream in the ESP. The negative collection efficiency means that the particle concentration flowing downstream is greater than that upstream in the ESP. This phenomenon is explained as the re-entrainment of particles. In this paper, experiments were carried out to investigate the cause of the decrease in efficiency of particle collection of the ESP. The time characteristic of the collection efficiency and the distribution of particle size on the collection electrodes were studied. Experimental results showed that the decrease in the collection efficiency and the distribution of particle size on the collection electrodes were studied. Experimental results showed that the decrease in the collection efficiency was caused by re-entrainment of particles during the ESP operation. The effect of gas-flow velocity on the collection efficiency of the ESP was also investigated to study the cause of re-entrainment phenomena. The result showed that the re-entrainment phenomena depended on the gas-flow velocity.

Zukeran, Akinori; Ehara, Yoshiyasu; Ito, Tairo; Matsuyama, M. [Musashi Inst. of Tech., Tokyo (Japan); Ikeda, Yasushi; Kawakami, Hitomi; Takahashi, Takeo; Takamatsu, Takeshi [Fuji Electric Co., Ltd., Tokyo (Japan)

1999-03-01T23:59:59.000Z

29

Mass transfer within electrostatic precipitators: trace gas adsorption by sorbent-covered plate electrodes  

Science Conference Proceedings (OSTI)

Varying degrees of mercury (Hg) capture have been reported within the electrostatic precipitators (ESPs) of coal-fired electric utility boilers. There has been some speculation that the adsorption takes place on the particulate-covered plate electrodes. This convective mass transfer analysis of laminar and turbulent channel flows provides the maximum potential for Hg adsorption by the plate electrodes within an ESP under those conditions. Mass transfer calculations, neglecting electro hydrodynamic (EHD) effects, reveal 65% removal of elemental Hg for a laminar flow within a 15-m-long channel of 0.2-m spacing and 42% removal for turbulent flow within a similar configuration. Both configurations represent specific collection areas (SCAs) that are significantly larger than conventional ESPs in use. Results reflecting more representative SCA values generally returned removal efficiencies of {lt}20%. EHD effects, although potentially substantial at low Reynolds numbers, diminish rapidly with increasing Reynolds number and become negligible at typical ESP operating conditions. The present results indicate maximum Hg removal efficiencies for ESPs that are much less than those observed in practice for comparable ESP operating conditions. Considering Hg adsorption kinetics and finite sorbent capacity in addition to the present mass transfer analyses would yield even lower adsorption efficiencies than the present results. In a subsequent paper, the author addresses the mass transfer potential presented by the charged, suspended particulates during their collection within an ESP and the role they potentially play in Hg capture within ESPs. 28 refs., 4 figs.

Herek L. Clack [Illinois Institute of Technology, Chicago, IL (United States). Department of Mechanical, Materials, and Aerospace Engineering

2006-06-15T23:59:59.000Z

30

Retrofit of waste-to-energy facilities equipped with electrostatic precipitators. Volume III: Test protocol  

DOE Green Energy (OSTI)

The American Society of Mechanical Engineers' [ASME] Center for Research and Technology Development [CRTD] has been awarded a subcontract by the National Renewable Energy Laboratory [NREL] to demonstrate the technical performance and viability of flue gas temperature control in combination with dry acid gas reagent and activated carbon injection at an existing electrostatic precipitator [ESP] equipped municipal waste combustor [MWC]. The objective of this proof-of-concept demonstration test is to economically and reliably meet 40 CFR 60 Subpart Cb Emissions Guidelines for MWC's at existing ESP equipped facilities. The effort is being directed by a Subcommittee of tile ASME Research Committee on Industrial and Municipal Wastes [RCIMW] chaired by Dave Hoecke. Mr. Greg Barthold of ASME/CRTD is the Project Manager. ASME/CRTD contracted with Rigo & Rigo Associates, Inc. in cooperation with A.J. Chandler & Associates, Ltd. to be the Principal Investigator for the project and manage the day-t o-day aspects of the program, conduct the testing reduce and interpret the data and prepare the report. Testing will be conducted at the 2 by 210 TPD, ESP equipped MWC at the Davis County Resource Recovery Facility in Layton, Utah. The test plan calls for duplicate metals (Cd, Pb and Hg), dioxin and acid gas runs.

Rigo, H.G. [Rigo & Rigo Associates, Inc., Berea, OH (US); Chandler, A.J. [A.J. Chandler & Associates, Inc., Toronto, Ontario (Canada)

1996-04-01T23:59:59.000Z

31

Mass transfer within electrostatic precipitators: in-flight adsorption of mercury by charged suspended particulates  

Science Conference Proceedings (OSTI)

Electrostatic precipitation is the dominant method of particulate control used for coal combustion, and varying degrees of mercury capture and transformation have been reported across ESPs. Nevertheless, the fate of gas-phase mercury within an ESP remains poorly understood. The present analysis focuses on the gas-particle mass transfer that occurs within a charged aerosol in an ESP. As a necessary step in gas-phase mercury adsorption or transformation, gas-particle mass transfer - particularly in configurations other than fixed beds - has received far less attention than studies of adsorption kinetics. Our previous analysis showed that only a small fraction of gas-phase mercury entering an ESP is likely to be adsorbed by collected particulate matter on the plate electrodes. The present simplified analysis provides insight into gas-particle mass transfer within an ESP under two limiting conditions: laminar and turbulent fluid flows. The analysis reveals that during the process of particulate collection, gas-particle mass transfer can be quite high, easily exceeding the mass transfer to ESP plate electrodes in most cases. Decreasing particle size, increasing particle mass loading, and increasing temperature all result in increased gas-particle mass transfer. The analysis predicts significantly greater gas-particle mass transfer in the laminar limit than in the turbulent limit; however, the differences become negligible under conditions where other factors, such as total mass of suspended particulates, are the controlling mass transfer parameters. Results are compared to selected pilot- and full-scale sorbent injection data. 41 refs., 5 figs.

Herek L. Clack [Illinois Institute of Technology, Chicago, IL (United States). Department of Mechanical, Materials and Aerospace Engineering

2006-06-01T23:59:59.000Z

32

Electrostatic precipitator V-I (ESPVI 4.0) and performance prediction model (for microcomputers). Model-Simulation  

SciTech Connect

The microcomputer program ESPVI 4.0 was developed to provide a user-friendly interface to an advanced model of electrostatic precipitation (ESP) performance. The program is capable of modeling standard ESP configurations as well as those that might be proposed for improved performance. It incorporates many of the latest developments in prediction of ESP performance, including electrical waveform effects, non-rapping reentrainment, and electrode misalignment. The program is organized by a series of menu screens with increasing levels of detail provided as the menus become more specific. The user`s manual provides the documentation needed to load the program from its disk, set up the computer configuration for optimal operation, and introduces the operation of the program. The user is expected to be familiar with the operation of an ESP and know the important factors that affect it. An example ESP is provided with the program to help with the manual`s exposition. It is taken from a report describing measurement of the unit`s performance and so provides a direct comparison of the models predictions.

NONE

1996-02-01T23:59:59.000Z

33

Electrostatic precipitation of condensed acid mist: Second quarterly technical progress report, December 1, 1988--February 28, 1989  

Science Conference Proceedings (OSTI)

This report covers the project scope and structure for developing and demonstrating a compact, wet electrostatic collector for condensed acid mist in power plant flue gas. In order to accomplish this goal, the objectives to be met are: (1) a laboratory-version of the WESP (Wet Electrostatic Precipitator) must be fabricated, (2) the WESP performance must be optimized through laboratory tests with a nonvolatile simulant aerosol having a size distribution similar to the acid mist, (3) the WESP concept must be proven by demonstrating adequate collection of actual acid mist in a pilot coal combustion facility under conditions simulating a full-scale power plant burning high-sulfur coal, (4) a computer model of the WESP process must be developed to assist in the process optimization, interpretation of test results, and extrapolation to full scale, and (5) utility participation must be solicited in a follow-on demonstration of the WESP concept at a full-scale power plant. Progress in laboratory testing and collection efficiency is described. 5 refs., 2 figs.

Dahlin, R.S.

1989-01-01T23:59:59.000Z

34

Measurement and capture of fine and ultrafine particles from a pilot-scale pulverized coal combustor with an electrostatic precipitator  

Science Conference Proceedings (OSTI)

Experiments were carried out in a pilot-scale pulverized coal combustor at the Energy and Environmental Research Center (EERC) burning a Powder River Basin (PRB) subbituminous coal. A scanning mobility particle sizer (SMPS) and an electrical low-pressure impactor (ELPI) were used to measure the particle size distributions (PSDs) in the range of 17 nm to 10 m at the inlet and outlet of the electrostatic precipitator (ESP). At the ESP inlet, a high number concentration of ultrafine particles was found, with the peak at approximately 75 nm. A trimodal PSD for mass concentration was observed with the modes at approximately 80-100 nm, 1-2 {mu}m, and 10 {mu}m. The penetration of ultrafine particles through the ESP increased dramatically as particle size decreased below 70 nm, attributable to insufficient or partial charging of the ultrafine particles. Injection of nanostructured fine-particle sorbents for capture of toxic metals in the flue gas caused high penetration of the ultrafine particles through the ESP. The conventional ESP was modified to enhance charging using soft X-ray irradiation. A slipstream of flue gas was introduced from the pilot-scale facility and passed through this modified ESP. Enhancement of particle capture was observed with the soft X-ray irradiation when moderate voltages were used in the ESP, indicating more efficient charging of fine particles. 32 refs., 5 figs., 1 tab.

Ying Li; Achariya Suriyawong; Michael Daukoru; Ye Zhuang; Pratim Biswas [Washington University, St. Louis, MO (United States). Aerosol and Air Quality Research Laboratory

2009-05-15T23:59:59.000Z

35

Association of the sites of heavy metals with nanoscale carbon in a Kentucky electrostatic precipitator fly ash  

Science Conference Proceedings (OSTI)

A combination of high-resolution transmission electron microscopy, scanning transmission electron microscopy, and electron energy-loss spectroscopy (HRTEM-STEM-EELS) was used to study fly ashes produced from the combustion of an eastern Kentucky coal at a southeastern-Kentucky wall-fired pulverized coal utility boiler retrofitted for low-NOx combustion. Fly ash was collected from individual hoppers in each row of the electrostatic precipitators (ESP) pollution-control system, with multiple hoppers sampled within each of the three rows. Temperatures within the ESP array range from about 200 {degree}C at the entry to the first row to <150{degree}C at the exit of the third row. HRTEM-STEM-EELS study demonstrated the presence of nanoscale (10 s nm) C agglomerates with typical soot-like appearance and others with graphitic fullerene-like nanocarbon structures. The minute carbon agglomerates are typically juxtaposed and intergrown with slightly larger aluminosilicate spheres and often form an ultrathin halo or deposit on the fly ash particles. The STEM-EELS analyses revealed that the nanocarbon agglomerates host even finer (<3 nm) metal and metal oxide particles. Elemental analysis indicated an association of Hg with the nanocarbon. Arsenic, Se, Pb, Co, and traces of Ti and Ba are often associated with Fe-rich particles within the nanocarbon deposits. 57 refs., 5 figs.

James C. Hower; Uschi M. Graham; Alan Dozier; Michael T. Tseng; Rajesh A. Khatri [University of Kentucky, Lexington, KY (United States). Center for Applied Energy Research

2008-11-15T23:59:59.000Z

36

An Evaluation of Precipitation Forecasts from Operational Models and Reanalyses Including Precipitation Variations Associated with MJO Activity  

Science Conference Proceedings (OSTI)

In this paper, the results of an examination of precipitation forecasts for 1–30-day leads from global models run at the European Centre for Medium-Range Weather Forecasts (ECMWF) and the National Centers for Environmental Prediction (NCEP) ...

John E. Janowiak; Peter Bauer; Wanqiu Wang; Phillip A. Arkin; Jon Gottschalck

2010-12-01T23:59:59.000Z

37

Polycyclic aromatic hydrocarbon emission profiles and removal efficiency by electrostatic precipitator and wetfine scrubber in an iron ore sintering plant  

Science Conference Proceedings (OSTI)

A monitoring campaign of polychlorinated dibenzo-p-dioxins and dibenzofurans, polyaromatic hydrocarbons (PAHs), and polychlorinated biphenyl was carried out in an Italian iron ore sintering plant by sampling the combustion gases at the electrostatic precipitator (ESP) outlet, at the Wetfine scrubber (WS) outlet, and by collecting the ESP dust. Few data are available on these micropollutants produced in iron ore sintering plants, particularly from Italian plants. This study investigates the PAH emission profiles and the removal efficiency of ESPs and WS. PAHs were determined at the stack, ESP outlet flue gases, and in ESP dust to characterize the emission profiles and the performance of the ESP and the WS for reducing PAH emission. The 11 PAHs monitored are listed in the Italian legislative decree 152/2006. The mean total PAH sum concentration in the stack flue gases is 3.96 {mu}g/N m{sup 3}, in ESP outlet flue gases is 9.73 {mu}g/N m{sup 3}, and in ESP dust is 0.53 {mu}g/g. Regarding the emission profiles, the most abundant compound is benzo(b)fluoranthene, which has a relative low BaP toxic equivalency factors (TEF) value, followed by dibenzo(a,l)pyrene, which has a very high BaP(TEF) value. The emission profiles in ESP dust and in the flue gases after the ESP show some changes, whereas the fingerprint in ESP and stack flue gases is very similar. The removal efficiency of the ESP and of WS on the total PAH concentration is 5.2 and 59.5%, respectively. 2 figs., 5 tabs.

Ettore Guerriero; Antonina Lutri; Rosanna Mabilia; Maria Concetta Tomasi Sciano; Mauro Rotatori [Istituto sull'Inquinamento Atmosferico, Monterotondo Scalo (Italy). Consiglio Nazionale delle Ricerche

2008-11-15T23:59:59.000Z

38

Eta Model Precipitation Forecasts for a Period Including Tropical Storm Allison  

Science Conference Proceedings (OSTI)

A step-mountain (eta) coordinate limited-area model is being developed at the National Meteorological Center (NMC) to improve forecasts of severe weather and other mesoscale phenomena. Precipitation forecasts are reviewed for the 20-day period 16 ...

Fedor Mesinger; Thomas L. Black; David W. Plummer; John H. Ward

1990-09-01T23:59:59.000Z

39

Apparatus and method for improving electrostatic precipitator performance by plasma reactor conversion of SO.sub.2 to SO.sub.3  

DOE Patents (OSTI)

An apparatus and process that utilize a low temperature nonequilibrium plasma reactor, for improving the particulate removal efficiency of an electrostatic precipitator (ESP) are disclosed. A portion of the flue gas, that contains a low level of SO.sub.2 O.sub.2 H.sub.2 O, and particulate matter, is passed through a low temperature plasma reactor, which defines a plasma volume, thereby oxidizing a portion of the SO.sub.2 present in the flue gas into SO.sub.3. An SO.sub.2 rich flue gas is thereby generated. The SO.sub.3 rich flue gas is then returned to the primary flow of the flue gas in the exhaust treatment system prior to the ESP. This allows the SO.sub.3 to react with water to form H.sub.2 SO.sub.4 that is in turn is absorbed by fly ash in the gas stream in order to improve the removal efficiency of the EPS.

Huang, Hann-Sheng (Darien, IL); Gorski, Anthony J. (Woodridge, IL)

1999-01-01T23:59:59.000Z

40

Partitioning of mercury, arsenic, selenium, boron, and chloride in a full-scale coal combustion process equipped with selective catalytic reduction, electrostatic precipitation, and flue gas desulfurization systems  

SciTech Connect

A full-scale field study was carried out at a 795 MWe coal-fired power plant equipped with selective catalytic reduction (SCR), an electrostatic precipitator (ESP), and wet flue gas desulfurization (FGD) systems to investigate the distribution of selected trace elements (i.e., mercury, arsenic, selenium, boron, and chloride) from coal, FGD reagent slurry, makeup water to flue gas, solid byproduct, and wastewater streams. Flue gases were collected from the SCR outlet, ESP inlet, FGD inlet, and stack. Concurrent with flue gas sampling, coal, bottom ash, economizer ash, and samples from the FGD process were also collected for elemental analysis. By combining plant operation parameters, the overall material balances of selected elements were established. The removal efficiencies of As, Se, Hg, and B by the ESP unit were 88, 56, 17, and 8%, respectively. Only about 2.5% of Cl was condensed and removed from flue gas by fly ash. The FGD process removed over 90% of Cl, 77% of B, 76% of Hg, 30% of Se, and 5% of As. About 90% and 99% of the FGD-removed Hg and Se were associated with gypsum. For B and Cl, over 99% were discharged from the coal combustion process with the wastewater. Mineral trona (trisodium hydrogendicarbonate dehydrate, Na{sub 3}H(CO{sub 3}){sub 2}.2H{sub 2}O) was injected before the ESP unit to control the emission of sulfur trioxide (SO{sub 3}). By comparing the trace elements compositions in the fly ash samples collected from the locations before and after the trona injection, the injection of trona did not show an observable effect on the partitioning behaviors of selenium and arsenic, but it significantly increased the adsorption of mercury onto fly ash. The stack emissions of mercury, boron, selenium, and chloride were for the most part in the gas phase. 47 refs., 3 figs., 11 tabs.

Chin-Min Cheng; Pauline Hack; Paul Chu; Yung-Nan Chang; Ting-Yu Lin; Chih-Sheng Ko; Po-Han Chiang; Cheng-Chun He; Yuan-Min Lai; Wei-Ping Pan [Western Kentucky University, Bowling Green, KY (United States). Institute for Combustion Science and Environmental Technology

2009-09-15T23:59:59.000Z

Note: This page contains sample records for the topic "include electrostatic precipitators" 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

Analytical Electrostatic  

The Appelhans '821 electrostatic dispersion lens (EDL) enhances the dispersion between ion beams without regard to the energy of ions in the beams. It uses an electrostatic field shaped by two nested, one-quarter section, right cylindrical ...

42

Precipitator Performance Estimation Procedure  

Science Conference Proceedings (OSTI)

Increased availability of data to use with an existing computer model makes it possible for utilities to calculate electrostatic precipitator performance without access to industry databases. This report examines the accuracy of the model and develops procedures to make it a more useful tool for troubleshooting precipitator performance and for selecting the size of a new unit.

1986-12-22T23:59:59.000Z

43

Behavior of an Inversion-Based precipitation Retrieval Algorithm with High-Resolution AMPR Measurements Including a Low-Frequency 10.7-GHz Channel  

Science Conference Proceedings (OSTI)

A microwave-based, profile-type precipitation retrieval algorithm has been used to analyze high-resolution passive microwave measurements over an ocean background, obtained by the Advanced Microwave Precipitation Radiometer(AMPR) flown on ANASA ...

E. A. Smith; X. Xiang; A. Mugnai; R. E. Hood; R. W. Spencer

1994-08-01T23:59:59.000Z

44

Precipitator Layup Report  

Science Conference Proceedings (OSTI)

EPRI members faced with the need to lay up (temporarily shut down) coal-fired units for extended periods of time because of the current economic downturn have requested guidance on the methods and techniques necessary for protecting electrostatic precipitators (ESPs) and their associated auxiliaries from corrosion damage and other degradation, both mechanical and electrical, during such layups.

2010-11-15T23:59:59.000Z

45

Factors Affecting the Resistivity of Recovery Boiler Precipitator Ash.  

E-Print Network (OSTI)

??Electrostatic precipitators (ESPs) are commonly used to control particulate emissions from recovery boilers in the kraft pulping process. The electrical resistivity of entrained particulates is… (more)

Sretenovic, Ivan

2012-01-01T23:59:59.000Z

46

Electrostatic thin film chemical and biological sensor  

DOE Patents (OSTI)

A chemical and biological agent sensor includes an electrostatic thin film supported by a substrate. The film includes an electrostatic charged surface to attract predetermined biological and chemical agents of interest. A charge collector associated with said electrostatic thin film collects charge associated with surface defects in the electrostatic film induced by the predetermined biological and chemical agents of interest. A preferred sensing system includes a charge based deep level transient spectroscopy system to read out charges from the film and match responses to data sets regarding the agents of interest. A method for sensing biological and chemical agents includes providing a thin sensing film having a predetermined electrostatic charge. The film is exposed to an environment suspected of containing the biological and chemical agents. Quantum surface effects on the film are measured. Biological and/or chemical agents can be detected, identified and quantified based on the measured quantum surface effects.

Prelas, Mark A. (Columbia, MO); Ghosh, Tushar K. (Columbia, MO); Tompson, Jr., Robert V. (Columbia, MO); Viswanath, Dabir (Columbia, MO); Loyalka, Sudarshan K. (Columbia, MO)

2010-01-19T23:59:59.000Z

47

Compact electrostatic comb actuator  

DOE Patents (OSTI)

A compact electrostatic comb actuator is disclosed for microelectromechanical (MEM) applications. The actuator is based upon a plurality of meshed electrostatic combs, some of which are stationary and others of which are moveable. One or more restoring springs are fabricated within an outline of the electrostatic combs (i.e. superposed with the moveable electrostatic combs) to considerably reduce the space required for the actuator. Additionally, a truss structure is provided to support the moveable electrostatic combs and prevent bending or distortion of these combs due to unbalanced electrostatic forces or external loading. The truss structure formed about the moveable electrostatic combs allows the spacing between the interdigitated fingers of the combs to be reduced to about one micron or less, thereby substantially increasing the number of active fingers which can be provided in a given area. Finally, electrostatic shields can be used in the actuator to substantially reduce unwanted electrostatic fields to further improve performance of the device. As a result, the compact electrostatic comb actuator of the present invention occupies only a fraction of the space required for conventional electrostatic comb actuators, while providing a substantial increase in the available drive force (up to one-hundred times).

Rodgers, M. Steven (Albuquerque, NM); Burg, Michael S. (Albuquerque, NM); Jensen, Brian D. (Albuquerque, NM); Miller, Samuel L. (Albuquerque, NM); Barnes, Stephen M. (Albuquerque, NM)

2000-01-01T23:59:59.000Z

48

Electrostatically actuatable light modulating device  

DOE Patents (OSTI)

The electrostatically actuatable light modulator utilizes an opaque substrate plate patterned with an array of aperture cells, the cells comprised of physically positionable dielectric shutters and electrostatic actuators. With incorporation of a light source and a viewing screen, a projection display system is effected. Inclusion of a color filter array aligned with the aperture cells accomplishes a color display. The system is realized in terms of a silicon based manufacturing technology allowing fabrication of a high resolution capability in a physically small device which with the utilization of included magnification optics allows both large and small projection displays.

Koehler, Dale R. (1332 Wagontrain Dr., Albuquerque, NM 87123)

1991-01-01T23:59:59.000Z

49

Electrostatic Graphene Loudspeaker  

Alex Zettl and Qin Zhou of Berkeley Lab have developed a miniaturized graphene-based electrostatic audio transducer. The speaker / earphone is ...

50

Optics Elements for Modeling Electrostatic Lenses and Accelerator Components: III. Electrostatic Deflectors  

DOE Green Energy (OSTI)

Ion-beam optics models for simulating electrostatic prisms (deflectors) of different geometries have been developed for the computer code TRACE 3-D. TRACE 3-D is an envelope (matrix) code, which includes a linear space charge model, that was originally developed to model bunched beams in magnetic transport systems and radiofrequency (RF) accelerators. Several new optical models for a number of electrostatic lenses and accelerator columns have been developed recently that allow the code to be used for modeling beamlines and accelerators with electrostatic components. The new models include a number of options for: (1) Einzel lenses, (2) accelerator columns, (3) electrostatic prisms, and (4) electrostatic quadrupoles. A prescription for setting up the initial beam appropriate to modeling 2-D (continuous) beams has also been developed. The models for electrostatic prisms are described in this paper. The electrostatic prism model options allow the modeling of cylindrical, spherical, and toroidal electrostatic deflectors. The application of these models in the development of ion-beam transport systems is illustrated through the modeling of a spherical electrostatic analyzer as a component of the new low energy beamline at CAMS.

Brown, T.A.; Gillespie, G.H.

1999-10-21T23:59:59.000Z

51

Harmonic parameterization by electrostatics  

Science Conference Proceedings (OSTI)

In this article, we introduce a method to apply ideas from electrostatics to parameterize the open space around an object. By simulating the object as a virtually charged conductor, we can define an object-centric coordinate system which we call Electric ... Keywords: Coordinates, cloth control, parameterization

He Wang, Kirill A. Sidorov, Peter Sandilands, Taku Komura

2013-09-01T23:59:59.000Z

52

Micromachined silicon electrostatic chuck  

DOE Patents (OSTI)

In the field of microelectronics, and in particular the fabrication of microelectronics during plasma etching processes, electrostatic chucks have been used to hold silicon wafers during the plasma etching process. Current electrostatic chucks that operate by the {open_quotes}Johnson-Rahbek Effect{close_quotes} consist of a metallic base plate that is typically coated with a thick layer of slightly conductive dielectric material. A silicon wafer of approximately the same size as the chuck is placed on top of the chuck and a potential difference of several hundred volts is applied between the silicon and the base plate of the electrostatic chuck. This causes an electrostatic attraction proportional to the square of the electric field in the gap between the silicon wafer and the chuck face. When the chuck is used in a plasma filled chamber the electric potential of the wafer tends to be fixed by the effective potential of the plasma. The purpose of the dielectric layer on the chuck is to prevent the silicon wafer from coming into direct electrical contact with the metallic part of the chuck and shorting out the potential difference. On the other hand, a small amount of conductivity appears to be desirable in the dielectric coating so that much of its free surface between points of contact with the silicon wafer is maintained near the potential of the metallic base plate; otherwise, a much larger potential difference would be needed to produce a sufficiently large electric field in the vacuum gap between the wafer and chuck. Typically, the face of the chuck has a pattern of grooves in which about 10 torr pressure of helium gas is maintained. This gas provides cooling (thermal contact) between the wafer and the chuck. A pressure of 10 torr is equivalent to about 0.2 psi.

Anderson, R.A.; Seager, C.H.

1994-12-31T23:59:59.000Z

53

Biomolecular electrostatics and solvation: a computational perspective  

Science Conference Proceedings (OSTI)

An understanding of molecular interactions is essential for insight into biological systems at the molecular scale. Among the various components of molecular interactions, electrostatics are of special importance because of their long-range nature and their influence on polar or charged molecules, including water, aqueous ions, proteins, nucleic acids, carbohydrates, and membrane lipids. In particular, robust models of electrostatic interactions are essential for understanding the solvation properties of biomolecules and the effects of solvation upon biomolecular folding, binding, enzyme catalysis and dynamics. Electrostatics, therefore, are of central importance to understanding biomolecular structure and modeling interactions within and among biological molecules. This review discusses the solvation of biomolecules with a computational biophysics view towards describing the phenomenon. While our main focus lies on the computational aspect of the models, we summarize the common characteristics of biomolecular solvation (e.g., solvent structure, polarization, ion binding, and nonpolar behavior) in order to provide reasonable backgrounds to understand the solvation models.

Ren, Pengyu; Chun, Jaehun; Thomas, Dennis G.; Schnieders, Michael; Marucho, Marcelo; Zhang, Jiajing; Baker, Nathan A.

2012-11-01T23:59:59.000Z

54

Electrostatic generator/motor configurations  

DOE Patents (OSTI)

Electrostatic generators/motors designs are provided that include a stator fixedly connected to a first central support centered about a central axis. The stator elements are attached to the first central support. Similarly, a second stator is connected to a central support centered about the central axis, and the second stator has stator elements attached to the second central support. A rotor is located between the first stator and the second stator and includes an outer support, where the rotor is rotatably centered about the central axis, the rotor having elements in contact with the outer support, each rotor element having an extending rotor portion that extends radially from the outer support toward the axis of rotation.

Post, Richard Freeman

2012-09-11T23:59:59.000Z

55

ELECTROSTATICALLY ENHANCED BARRIER FILTER COLLECTION  

SciTech Connect

This work was performed through the University of North Dakota (UND) Chemical Engineering Department with assistance from UND's Energy & Environmental Research Center. This research was undertaken in response to the U.S. Department of Energy Federal Technology Center Program Solicitation No. DE-PS26-99FT40479, Support of Advanced Coal Research at U.S. Universities and Colleges. Specifically, this research was in support of the UCR Core Program and addressees Topic 1, Improved Hot-Gas Contaminant and Particulate Removal Techniques, introducing an advanced design for particulate removal. Integrated gasification combined cycle (IGCC) offers the potential for very high efficiency and clean electric generation. In IGCC, the product gas from the gasifier needs to be cleaned of particulate matter to avoid erosion and high-temperature corrosion difficulties arising with the turbine blades. Current methods involve cooling the gases to {approx}100 C to condense alkalis and remove sulfur and particulates using conventional scrubber technology. This ''cool'' gas is then directed to a turbine for electric generation. While IGCC has the potential to reach efficiencies of over 50%, the current need to cool the product gas for cleaning prior to firing it in a turbine is keeping IGCC from reaching its full potential. The objective of the current project was to develop a highly reliable particulate collector system that can meet the most stringent turbine requirements and emission standards, can operate at temperatures above 1500 F, is applicable for use with all U.S. coals, is compatible with various sorbent injection schemes for sulfur and alkali control, can be integrated into a variety of configurations for both pressurized gasification and combustion, increases allowable face velocity to reduce filter system capital cost, and is cost-competitive with existing technologies. The collector being developed is a new concept in particulate control called electrostatically enhanced barrier filter collection (EBFC). This concept combines electrostatic precipitation (ESP) with candle filters in a single unit. Similar technology has been recently proven on a commercial scale for atmospheric applications, but needed to be tested at high temperatures and pressures. The synergy obtained by combining the two control technologies into a single system should actually reduce filter system capital and operating costs and make the system more reliable. More specifically, the ESP is expected to significantly reduce candle filter load and also to limit ash reintrainment, allowing for full recovery of baseline pressure drop during backpulsing of the filters.

John Erjavec; Michael D. Mann; Ryan Z. Knutson; Michael L. Swanson; Michael E. Collings

2003-06-01T23:59:59.000Z

56

Flue gas conditioning for improved particle collection in electrostatic precipitators  

SciTech Connect

The purpose of this research program is to identify and evaluate a variety of additives capable of increasing particle cohesion which could be used for improving collection efficiency in an ESP. A three-phase screening process will be used to provide the, evaluation of many additives in a logical and cost-effective manner. The three step approach involves the following experimental setups: 1. Provide a preliminary screening in the laboratory by measuring the effects of various conditioning agents on reentrainment of flyash particles in an electric field operating at simulated flue gas conditions. 2. Evaluate the successful additives using a 100 acfm bench-scale ESP operating on actual flue gas. 3. Obtain the data required for scaling up the technology by testing the two or three most promising conditioning agents at the pilot scale.

Durham, M.D.

1992-04-27T23:59:59.000Z

57

Electrostatic transfer of epitaxial graphene to glass.  

SciTech Connect

We report on a scalable electrostatic process to transfer epitaxial graphene to arbitrary glass substrates, including Pyrex and Zerodur. This transfer process could enable wafer-level integration of graphene with structured and electronically-active substrates such as MEMS and CMOS. We will describe the electrostatic transfer method and will compare the properties of the transferred graphene with nominally-equivalent 'as-grown' epitaxial graphene on SiC. The electronic properties of the graphene will be measured using magnetoresistive, four-probe, and graphene field effect transistor geometries [1]. To begin, high-quality epitaxial graphene (mobility 14,000 cm2/Vs and domains >100 {micro}m2) is grown on SiC in an argon-mediated environment [2,3]. The electrostatic transfer then takes place through the application of a large electric field between the donor graphene sample (anode) and the heated acceptor glass substrate (cathode). Using this electrostatic technique, both patterned few-layer graphene from SiC(000-1) and chip-scale monolayer graphene from SiC(0001) are transferred to Pyrex and Zerodur substrates. Subsequent examination of the transferred graphene by Raman spectroscopy confirms that the graphene can be transferred without inducing defects. Furthermore, the strain inherent in epitaxial graphene on SiC(0001) is found to be partially relaxed after the transfer to the glass substrates.

Ohta, Taisuke; Pan, Wei; Howell, Stephen Wayne; Biedermann, Laura Butler; Beechem Iii, Thomas Edwin; Ross, Anthony Joseph, III

2010-12-01T23:59:59.000Z

58

ELECTROSTATIC MEMORY SYSTEM  

DOE Patents (OSTI)

An improved electrostatic memory system is de scribed fer a digital computer wherein a plarality of storage tubes are adapted to operate in either of two possible modes. According to the present irvention, duplicate storage tubes are provided fur each denominational order of the several binary digits. A single discriminator system is provided between corresponding duplicate tubes to determine the character of the infurmation stored in each. If either tube produces the selected type signal, corresponding to binazy "1" in the preferred embodiment, a "1" is regenerated in both tubes. In one mode of operation each bit of information is stored in two corresponding tubes, while in the other mode of operation each bit is stored in only one tube in the conventional manner.

Chu, J.C.

1958-09-23T23:59:59.000Z

59

DISSOLUTION OF LANTHANUM FLUORIDE PRECIPITATES  

DOE Patents (OSTI)

A plutonium separatory ore concentration procedure involving the use of a fluoride type of carrier is presented. An improvement is given in the derivation step in the process for plutonium recovery by carrier precipitation of plutonium values from solution with a lanthanum fluoride carrier precipitate and subsequent derivation from the resulting plutonium bearing carrier precipitate of an aqueous acidic plutonium-containing solution. The carrier precipitate is contacted with a concentrated aqueous solution of potassium carbonate to effect dissolution therein of at least a part of the precipitate, including the plutonium values. Any remaining precipitate is separated from the resulting solution and dissolves in an aqueous solution containing at least 20% by weight of potassium carbonate. The reacting solutions are combined, and an alkali metal hydroxide added to a concentration of at least 2N to precipitate lanthanum hydroxide concomitantly carrying plutonium values.

Fries, B.A.

1959-11-10T23:59:59.000Z

60

Attractive electrostatic self-assembly of ordered and disordered heterogeneous colloids  

E-Print Network (OSTI)

Ionic colloidal crystals are here defined as multicomponent ordered colloidal structures stabilized by attractive electrostatic interactions. These crystals are colloidal analogues to ionic materials including zincblende, ...

Maskaly, Garry R. (Garry Russell), 1978-

2005-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "include electrostatic precipitators" 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

Klystron having electrostatic quadrupole focusing arrangement  

DOE Patents (OSTI)

A klystron includes a source for emitting at least one electron beam, and an accelerator for accelarating the beam in a given direction through a number of drift tube sections successively aligned relative to one another in the direction of the beam. A number of electrostatic quadrupole arrays are successively aligned relative to one another along at least one of the drift tube sections in the beam direction for focusing the electron beam. Each of the electrostatic quadrupole arrays forms a different quadrupole for each electron beam. Two or more electron beams can be maintained in parallel relationship by the quadrupole arrays, thereby enabling space charge limitations encountered with conventional single beam klystrons to be overcome.

Maschke, Alfred W. (East Moriches, NY)

1983-08-30T23:59:59.000Z

62

ARM - Measurement - Precipitation  

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

govMeasurementsPrecipitation govMeasurementsPrecipitation 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 : Precipitation All liquid or solid phase aqueous particles that originate in the atmosphere and fall to the earth's surface. 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 CO2FLX : Carbon Dioxide Flux Measurement Systems DISDROMETER : Impact Disdrometer LDIS : Laser Disdrometer MWRHF : Microwave Radiometer - High Frequency

63

Continuum Electrostatics in Cell Biology  

E-Print Network (OSTI)

Recent experiments revealing possible nanoscale electrostatic interactions in force generation at kinetochores for chromosome motions have prompted speculation regarding possible models for interactions between positively charged molecules in kinetochores and negative charge on C-termini near the plus ends of microtubules. A clear picture of how kinetochores establish and maintain a dynamic coupling to microtubules for force generation during the complex motions of mitosis remains elusive. The current paradigm of molecular cell biology requires that specific molecules, or molecular geometries, for force generation be identified. However, it is possible to account for mitotic motions within a classical electrostatics approach in terms of experimentally known cellular electric charge interacting over nanometer distances. These charges are modeled as bound surface and volume continuum charge distributions. Electrostatic consequences of intracellular pH changes during mitosis may provide a master clock for the events of mitosis.

L. John Gagliardi

2010-02-06T23:59:59.000Z

64

Magnetic Insulation for Electrostatic Accelerators  

Science Conference Proceedings (OSTI)

The voltage gradient which can be sustained between electrodes without electrical breakdowns is usually one of the most important parameters in determining the performance which can be obtained in an electrostatic accelerator. We have recently proposed a technique which might permit reliable operation of electrostatic accelerators at higher electric field gradients, perhaps also with less time required for the conditioning process in such accelerators. The idea is to run an electric current through each accelerator stage so as to produce a magnetic field which envelopes each electrode and its electrically conducting support structures. Having the magnetic field everywhere parallel to the conducting surfaces in the accelerator should impede the emission of electrons, and inhibit their ability to acquire energy from the electric field, thus reducing the chance that local electron emission will initiate an arc. A relatively simple experiment to assess this technique is being planned. If successful, this technique might eventually find applicability in electrostatic accelerators for fusion and other applications.

Grisham, L. R. [Princeton Plasma Physics Laboratory, P. O. Box 451, Princeton, New Jersey 08543 (United States)

2011-09-26T23:59:59.000Z

65

CONCENTRATION OF Pu USING AN IODATE PRECIPITATE  

DOE Patents (OSTI)

A method is given for separating plutonium from lanthanum in a lanthanum fluoride carrier precipitation process for the recovery of plutonium values from an aqueous solution. The carrier precipitation process includes the steps of forming a lanthanum fluoride precipi- . tate, thereby carrying plutonium out of solution, metathesizing the fluoride precipitate to a hydroxide precipitate, and then dissolving the hydroxide precipitate in nitric acid. In accordance with the invention, the nitric acid solution, which contains plutonium and lanthanum, is made 0.05 to 0.15 molar in potassium iodate. thereby precipitating plutonium as plutonous iodate and the plutonous iodate is separated from the lanthanum- containing supernatant solution.

Fries, B.A.

1960-02-23T23:59:59.000Z

66

Dynamics of electrostatically driven granular media: Effects of humidity  

SciTech Connect

We performed experimental studies of the effect of humidity on the dynamics of electrostatically driven granular materials. Both conducting and dielectric particles undergo a phase transition from an immobile state (granular solid) to a fluidized state (granular gas) with increasing applied field. Spontaneous precipitation of solid clusters from the gas phase occurs as the external driving is decreased. The clustering dynamics in conducting particles is primarily controlled by screening of the electric field but is aided by cohesion due to humidity. It is shown that humidity effects dominate the clustering process with dielectric particles.

Howell, D. W.; Aronson, Igor S.; Crabtree, G. W.

2001-05-01T23:59:59.000Z

67

Magnetic and electrostatic confinement of plasma with tuning of electrostatic field  

DOE Patents (OSTI)

A system and method for containing plasma and forming a Field Reversed Configuration (FRC) magnetic topology are described in which plasma ions are contained magnetically in stable, non-adiabatic orbits in the FRC. Further, the electrons are contained electrostatically in a deep energy well, created by tuning an externally applied magnetic field. The simultaneous electrostatic confinement of electrons and magnetic confinement of ions avoids anomalous transport and facilitates classical containment of both electrons and ions. In this configuration, ions and electrons may have adequate density and temperature so that upon collisions they are fused together by nuclear force, thus releasing fusion energy. Moreover, the fusion fuel plasmas that can be used with the present confinement system and method are not limited to neutronic fuels only, but also advantageously include advanced fuels.

Rostoker, Norman (Irvine, CA); Binderbauer, Michl (Irvine, CA); Qerushi, Artan (Irvine, CA); Tahsiri, Hooshang (Irvine, CA)

2008-10-21T23:59:59.000Z

68

Electrostatic Conversion for Vibration Energy Harvesting  

E-Print Network (OSTI)

This chapter focuses on vibration energy harvesting using electrostatic converters. It synthesizes the various works carried out on electrostatic devices, from concepts, models and up to prototypes, and covers both standard (electret-free) and electret-based electrostatic vibration energy harvesters (VEH).

Boisseau, S; Seddik, B Ahmed

2012-01-01T23:59:59.000Z

69

The Hotplate Precipitation Gauge  

Science Conference Proceedings (OSTI)

A new instrument designed to measure precipitation, the “hotplate precipitation gauge,” is described. The instrument consists of a heated thin disk that provides a reliable, low-maintenance method to measure precipitation rate every minute ...

Roy M. Rasmussen; John Hallett; Rick Purcell; Scott D. Landolt; Jeff Cole

2011-02-01T23:59:59.000Z

70

Electrostatic dust detector  

DOE Patents (OSTI)

An apparatus for detecting dust in a variety of environments which can include radioactive and other hostile environments both in a vacuum and in a pressurized system. The apparatus consists of a grid coupled to a selected bias voltage. The signal generated when dust impacts and shorts out the grid is electrically filtered, and then analyzed by a signal analyzer which is then sent to a counter. For fine grids a correlation can be developed to relate the number of counts observed to the amount of dust which impacts the grid.

Skinner, Charles H. (Lawrenceville, NJ)

2006-05-02T23:59:59.000Z

71

PRECIPITATION OF PLUTONOUS PEROXIDE  

DOE Patents (OSTI)

A precipitation process for recovering plutonium values contained in an aqueous solution is described. In the process for precipitating plutonium as plutonous peroxide, hydroxylamine or hydrazine is added to the plutoniumcontaining solution prior to the addition of peroxide to precipitate plutonium. The addition of hydroxylamine or hydrazine increases the amount of plutonium precipitated as plutonous peroxide. (AEC)

Barrick, J.G.; Manion, J.P.

1961-08-15T23:59:59.000Z

72

Precipitation over Concave Terrain  

Science Conference Proceedings (OSTI)

Many topographic barriers are comprised of a series of concave or convex ridges that modulate the intensity and distribution of precipitation over mountainous areas. In this model-based idealized study, stratiform precipitation associated with ...

Qingfang Jiang

2006-09-01T23:59:59.000Z

73

Ionic electrostatic excitations along biological membranes  

Science Conference Proceedings (OSTI)

A theoretical analysis of ionic electrostatic excitations of a charged biological membrane is presented within the framework of the fluid theory for surface ions inside and outside the cell, in conjunction with the Poisson's equation. General expressions of dispersion relations are obtained for electrostatic oscillations of intrinsic cellular with different shapes and symmetries.

Moradi, Afshin [Department of Nano Science, Kermanshah University of Technology, Kermanshah 67178-63766 (Iran, Islamic Republic of) and Department of Nano Science, Institute for Studies in Theoretical Physics and Mathematics (IPM), Tehran 19395-5531 (Iran, Islamic Republic of)

2011-02-15T23:59:59.000Z

74

The Charge Induced on a Conducting Cylinder by a Point Charge and Its Application to the Measurement of Charge on Precipitation  

Science Conference Proceedings (OSTI)

The solution of the electrostatic boundary value problem for a point charge inside an infinite cylinder is applied to sensors employed in the measurement of charge on precipitation. With these devices the charge induced on a cylindrical segment ...

Andrew J. Weinheimer

1988-04-01T23:59:59.000Z

75

Electrostatic Climber for Space Elevator and Launcher  

E-Print Network (OSTI)

Author details research on the new, very prospective, electrostatic Space Elevator climber based on a new electrostatic linear engine previously offered at the 42nd Joint Propulsion Conference (AIAA-2006-5229) and published in AEAT, Vol.78, No.6, 2006, pp. 502-508. The electrostatic climber discussed can have any speed (and braking), the energy for climber movement is delivered by a lightweight high-voltage line into a Space Elevator-holding cable from Earth electric generator. This electric line also can be used for delivery electric energy to a Geosynchronous Space Station. At present, the best solution of the climber problem (announced by NASA as one important awarding problem of Space Elevator) is problematic. Author also shows the linear electrostatic engine may be used as realistic power space launcher at the present time. Two projects illustrate these new devices. Key words: Space elevator, Electrostatic climber for space elevator, Electrostatic space launcher, Electrostatic accelerator. This work is presented as paper AIAA-2007-5838 for 43 Joint Propulsion Conference, Cincinnati, Ohio, USA, 9-11 July, 2007,

A. Bolonkin

2007-05-14T23:59:59.000Z

76

Electrostatic correlations: from Plasma to Biology  

E-Print Network (OSTI)

Electrostatic correlations play an important role in physics, chemistry and biology. In plasmas they lead to thermodynamic instability similar to the liquid-gas phase transition of simple molecular fluids. For charged colloidal suspensions the electrostatic correlations are responsible for screening and colloidal charge renormalization. In aqueous solutions containing multivalent counterions they can lead to charge inversion and flocculation. In biological systems the correlations account for the organization of cytoskeleton and the compaction of genetic material. In spite of their ubiquity, the true importance of electrostatic correlations has become fully appreciated only quite recently. In this paper, I will review the thermodynamic consequences of electrostatic correlations in a variety of systems ranging from classical plasmas to molecular biology.

Yan Levin

2002-07-02T23:59:59.000Z

77

Gibbsite Precipitation Inhibitors  

Gibbsite Precipitation Inhibitors 3 Mission Drivers There are high concentrations of aluminum as gibbsite or boehmite in Hanford High Level Waste

78

Electrostatic dispersion lenses and ion beam dispersion methods  

DOE Patents (OSTI)

An EDL includes a case surface and at least one electrode surface. The EDL is configured to receive through the EDL a plurality of ion beams, to generate an electrostatic field between the one electrode surface and either the case surface or another electrode surface, and to increase the separation between the beams using the field. Other than an optional mid-plane intended to contain trajectories of the beams, the electrode surface or surfaces do not exhibit a plane of symmetry through which any beam received through the EDL must pass. In addition or in the alternative, the one electrode surface and either the case surface or the other electrode surface have geometries configured to shape the field to exhibit a less abrupt entrance and/or exit field transition in comparison to another electrostatic field shaped by two nested, one-quarter section, right cylindrical electrode surfaces with a constant gap width.

Dahl, David A. (Idaho Falls, ID); Appelhans, Anthony D. (Idaho Falls, ID)

2010-12-28T23:59:59.000Z

79

Apparatus for magnetic and electrostatic confinement of plasma  

DOE Patents (OSTI)

An apparatus and method for containing plasma and forming a Field Reversed Configuration (FRC) magnetic topology are described in which plasma ions are contained magnetically in stable, non-adiabatic orbits in the FRC. Further, the electrons are contained electrostatically in a deep energy well, created by tuning an externally applied magnetic field. The simultaneous electrostatic confinement of electrons and magnetic confinement of ions avoids anomalous transport and facilitates classical containment of both electrons and ions. In this configuration, ions and electrons may have adequate density and temperature so that upon collisions ions are fused together by nuclear force, thus releasing fusion energy. Moreover, the fusion fuel plasmas that can be used with the present confinement system and method are not limited to neutronic fuels only, but also advantageously include advanced fuels.

Rostoker, Norman; Binderbauer, Michl

2013-06-11T23:59:59.000Z

80

Electrostatic AB-Ramjet Space Propulsion  

E-Print Network (OSTI)

A new electrostatic ramjet space engine is proposed and analyzed. The upper atmosphere (85 -1000 km) is extremely dense in ions (millions per cubic cm). The interplanetary medium contains positive protons from the solar wind. A charged ball collects the ions (protons) from the surrounding area and a special electric engine accelerates the ions to achieve thrust or decelerates the ions to achieve drag. The thrust may have a magnitude of several Newtons. If the ions are decelerated, the engine produces a drag and generates electrical energy. The theory of the new engine is developed. It is shown that the proposed engine driven by a solar battery (or other energy source) can not only support satellites in their orbit for a very long time but can also work as a launcher of space apparatus. The latter capability includes launch to high orbit, to the Moon, to far space, or to the Earth atmosphere (as a return thruster for space apparatus or as a killer of space debris). The proposed ramjet is very useful in interplanetary trips to far planets because it can simultaneously produce thrust or drag and large electric energy using the solar wind. Two scenarios, launch into the upper Earth atmosphere and an interplanetary trip, are simulated and the results illustrate the excellent possibilities of the new concept.

Alexander Bolonkin

2007-01-08T23:59:59.000Z

Note: This page contains sample records for the topic "include electrostatic precipitators" 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

precipitation | OpenEI  

Open Energy Info (EERE)

precipitation precipitation Dataset Summary Description This dataset, made available by the UK Department of Energy and Climate Change (DECC), presents summer and winter precipitation for England and Wales, and the percent change from the baseline (1961 - 1990 average). The original source of the data is the Hadley Centre. Source UK Department of Energy and Climate Change (DECC) Date Released March 12th, 2010 (4 years ago) Date Updated Unknown Keywords climate change precipitation UK Data application/vnd.ms-excel icon 1 Excel file: Precipitation, 1874 - 2009 (xls, 68.1 KiB) Quality Metrics Level of Review Some Review Comment (Does not have "National Statistics" status) Temporal and Spatial Coverage Frequency Time Period 1874 - 2009 License License Other or unspecified, see optional comment below

82

Kinetics of Ni Sorption in Soils: Roles of Soil Organic Matter and Ni Precipitation  

E-Print Network (OSTI)

Aqueous Model (WHAM),6,20 which is able to account for the effects of solution chemistry and SOM WHAM VI was integrated into the kinetics model to account for the effects of SOM concentrations by an electrostatic model built in WHAM VI for cation exchange on clay minerals. Ni precipitation kinetics were

Sparks, Donald L.

83

Molecular Electrostatics of Conjugated Self-Assembled Monolayers on Au(111) Using Electrostatic Force  

E-Print Network (OSTI)

Molecular Electrostatics of Conjugated Self-Assembled Monolayers on Au(111) Using Electrostatic groups and -conjugated orbitals, making them suitable for molecular electronics applications. We have for molecular electronics requires a subtle control of molecules at interfaces. Not only must molecules

Reifenberger, Ronald G.

84

CDIAC Precipitation Data Sets  

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

Precipitation Precipitation CDIAC Climate Holdings Containing Precipitation 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. Stations data; monthly totals Varies by station; through 1990 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. Station data; monthly totals Varies by station; some through most recent month A Computer-Based Atlas of Global Instrumental Climate Data (CDIAC DB-1003) R.S. Bradley et al. Monthly, seasonal, and annual anomaly maps of precipitation 1851 - 1989 Regional Data Sets Data Set Name Investigators Data Type/Format Period of Record

85

Thermodynamic Bounds on Nonlinear Electrostatic Perturbations in Intense Charged Particle Beams  

SciTech Connect

This paper places a lowest upper bound on the field energy in electrostatic perturbations in single-species charged particle beams with initial temperature anisotropy (TllT? < 1). The result applies to all electrostatic perturbations driven by the natural anisotropies that develop in accelerated particle beams, including Harris-type electrostatic instabilities, known to limit the luminosity and minimum spot size attainable in experiments. The thermodynamic bound on the field perturbation energy of the instabilities is obtained from the nonlinear Vlasov-Poisson equations for an arbitrary initial distribution function, including the effects of intense self-fields, finite geometry and nonlinear processes. This paper also includes analytical estimates of the nonlinear bounds for space-charge-dominated and emittance-dominated anisotropic bi-Maxwellian distributions.

Nikolas C. Logan and Ronald C. Davidson

2012-07-18T23:59:59.000Z

86

Multipole Electrostatics in Hydration Free Energy Calculations  

E-Print Network (OSTI)

Multipole Electrostatics in Hydration Free Energy Calculations YUE SHI,1 CHUANJIE WU,2 JAY W. PONDER,2 PENGYU REN1 1 Department of Biomedical Engineering, The University of Texas, Austin, Texas 78712: Hydration free energy (HFE) is generally used for evaluating molecular solubility, which is an important

Ponder, Jay

87

Electrostatic 'bounce' instability in a magnetotail configuration  

SciTech Connect

To understand the possible destabilization of two-dimensional current sheets, a kinetic model is proposed to describe the resonant interaction between electrostatic modes and trapped particles that bounce within the sheet. This work follows the initial investigation by Tur et al.[Phys. Plasmas 17, 102905 (2010)] that is revised and extended. Using a quasi-parabolic equilibrium state, the linearized gyro-kinetic Vlasov equation is solved for electrostatic fluctuations with period of the order of the electron bounce period. Using an appropriated Fourier expansion of the particle motion along the magnetic field, the complete time integration of the non-local perturbed distribution functions is performed. The dispersion relation for electrostatic modes is then obtained through the quasineutrality condition. It is found that strongly unstable electrostatic modes may develop provided that the current sheet is moderately stretched and, more important, that the proportion of passing particle remains small (less than typically 10%). This strong but finely tuned instability may offer opportunities to explain features of magnetospheric substorms.

Fruit, G.; Louarn, P.; Tur, A. [Institut de Recherche en Astrophysique et Planetologie (IRAP), Toulouse Universite de Toulouse, CNRS UMR5277, Toulouse (France)

2013-02-15T23:59:59.000Z

88

Estimating the Spatial Distribution of Precipitation in Iceland Using a Linear Model of Orographic Precipitation  

Science Conference Proceedings (OSTI)

A linear model of orographic precipitation that includes airflow dynamics, condensed water advection, and downslope evaporation is adapted for Iceland. The model is driven using coarse-resolution 40-yr reanalysis data from the European Centre for ...

Philippe Crochet; Tómas Jóhannesson; Trausti Jónsson; Oddur Sigurðsson; Helgi Björnsson; Finnur Pálsson; Idar Barstad

2007-12-01T23:59:59.000Z

89

Electrostatic zipping actuators and their applications to MEMS  

E-Print Network (OSTI)

Electrostatic actuation is the most common and well-developed method of generating motion on the micro scale. To overcome the challenge of providing both high force and large displacement, electrostatic zipping actuators ...

Li, Jian, Ph. D. Massachusetts Institute of Technology

2004-01-01T23:59:59.000Z

90

URANIUM PRECIPITATION PROCESS  

DOE Patents (OSTI)

A method for the recovery of uranium from sulfuric acid solutions is described. In the present process, sulfuric acid is added to the uranium bearing solution to bring the pH to between 1 and 1.8, preferably to about 1.4, and aluminum metal is then used as a reducing agent to convert hexavalent uranium to the tetravalent state. As the reaction proceeds, the pH rises amd a selective precipitation of uranium occurs resulting in a high grade precipitate. This process is an improvement over the process using metallic iron, in that metallic aluminum reacts less readily than metallic iron with sulfuric acid, thus avoiding consumption of the reducing agent and a raising of the pH without accomplishing the desired reduction of the hexavalent uranium in the solution. Another disadvantage to the use of iron is that positive ferric ions will precipitate with negative phosphate and arsenate ions at the pH range employed.

Thunaes, A.; Brown, E.A.; Smith, H.W.; Simard, R.

1957-12-01T23:59:59.000Z

91

Retrofit of waste-to-energy facilities equipped with electrostatic precipitators. Volume I: Report  

Science Conference Proceedings (OSTI)

To help lower the cost of compliance for waste-to-energy facilities, a retrofit technology using water spray temperature reduction combined with dry acid gas control reagent and powdered activated carbon [PAC] injection was tested in November, 1995 as part of an American Society of Mechanical Engineers' [ASME] Center for Research and Technology Development [CRTD] effort supported in part by the Department of Energy's National Renewable Energy Laboratory [NREL] and directed by the ASME Research Committee on Industrial and Municipal Waste. 2,000 mg/dsm{sup 3} @ 7% O{sub 2} (150 lb/hr) of trona (a natural sodium sesquicarbonate ore) injected through a rapid dispersion lance successfully controlled more than 50 percent of the acid gases. This should let facilities under 250 TPD meet the small plant guidelines for acid gas control. Various levels of PAC were injected along with the trona. 300 mg/dsm{sup 3} 7% O{sub 2} of PAC provides a comfortable margin between the emissions limitations achieved and both large and small plant regulatory guidelines for tetra- through octachlorinated dibenzo-p-dioxins and dibenzofurans [PCDD/F] and mercury when the ESP is operated below 350 F. Bi-fluid nozzles were used to spray finely atomized water between the economizer outlet and ESP inlet to maintain temperatures in the desired 300-350 F range. Particulate and metals emissions limitations were met by this 400 ft{sup 2}/1,000 acft{sup 2} specific collector area [SCA], 3-field ESP. Both the water sprays and PAC improved ESP performance. The demonstration was successful. With dry PAC, acid gas reagent injection, and temperature reduction, MWC emissions guidelines for facilities smaller than 250 TPD can be reliably met. Everything except the large facilities SO{sub 2} and HCl guideline emissions limitations was achieved. Better acid gas control should be achievable with more reagent addition if the ESP is efficient enough to avoid violating particulate limits.

Rigo, H.G. [Rigo & Rigo Associates, Inc., Berea, OH (US); Chandler, A.J. [A.J. Chandler & Associates, Ltd., Toronto, Ontario (Canada)

1996-04-01T23:59:59.000Z

92

High temperature behavior of electrostatic precipitator ash from municipal solid waste combustors  

E-Print Network (OSTI)

combustion may cause the oxidation of mercury, and chloride mercury #12;13 13 species may be the major form combustion and gasification flue gases, Environ. Sci. Technol. 30 (1996) 2421-2426. [23] S.B. Ghorishi, C Ms. Ref. No.: HAZMAT-D-07-00176 Accepted manuscript #12;2 2 Abstract Municipal solid waste (MSW) flue

Paris-Sud XI, Université de

93

Flue gas conditioning for improved particle collection in electrostatic precipitators. Quarterly technical report  

SciTech Connect

The purpose of this research program is to identify and evaluate a variety of additives capable of increasing particle cohesion which could be used for improving collection efficiency in an ESP. A three-phase screening process will be used to provide the, evaluation of many additives in a logical and cost-effective manner. The three step approach involves the following experimental setups: 1. Provide a preliminary screening in the laboratory by measuring the effects of various conditioning agents on reentrainment of flyash particles in an electric field operating at simulated flue gas conditions. 2. Evaluate the successful additives using a 100 acfm bench-scale ESP operating on actual flue gas. 3. Obtain the data required for scaling up the technology by testing the two or three most promising conditioning agents at the pilot scale.

Durham, M.D.

1992-04-27T23:59:59.000Z

94

A novel formulation of nonlocal electrostatics  

E-Print Network (OSTI)

The accurate modeling of the dielectric properties of water is crucial for many applications in physics, computational chemistry and molecular biology. This becomes possible in the framework of nonlocal electrostatics, for which we propose a novel formulation allowing for numerical solutions for the nontrivial molecular geometries arising in the applications mentioned before. Our approach is based on the introduction of a secondary field, $\\psi$, which acts as the potential for the rotation free part of the dielectric displacement field ${\\bf D}$. For many relevant models, the dielectric function of the medium can be expressed as the Green's function of a local differential operator. In this case, the resulting coupled Poisson (-Boltzmann) equations for $\\psi$ and the electrostatic potential $\\phi$ reduce to a system of coupled PDEs. The approach is illustrated by its application to simple geometries.

A. Hildebrandt; R. Blossey; S. Rjasanow; O. Kohlbacher; H. -P. Lenhof

2004-01-19T23:59:59.000Z

95

Illinois Precipitation Research: A Focus on Cloud and Precipitation Modification  

Science Conference Proceedings (OSTI)

At the heart of the 40-year atmospheric research endeavors of the Illinois State Water Survey have been studies to understand precipitation processes in order to learn how precipitation is modified purposefully and accidentally, and to measure ...

Stanley A. Changnon; Robert R. Czys; Robert W. Scott; Nancy E. Westcott

1991-05-01T23:59:59.000Z

96

Local molecular field theory for the treatment of electrostatics  

E-Print Network (OSTI)

We examine in detail the theoretical underpinnings of previous successful applications of local molecular field (LMF) theory to charged systems. LMF theory generally accounts for the averaged effects of long-ranged components of the intermolecular interactions by using an effective or restructured external field. The derivation starts from the exact Yvon-Born-Green hierarchy and shows that the approximation can be very accurate when the interactions averaged over are slowly varying at characteristic nearest-neighbor distances. Application of LMF theory to Coulomb interactions alone allows for great simplifications of the governing equations. LMF theory then reduces to a single equation for a restructured electrostatic potential that satisfies Poisson's equation defined with a smoothed charge density. Because of this charge smoothing by a Gaussian of width sigma, this equation may be solved more simply than the detailed simulation geometry might suggest. Proper choice of the smoothing length sigma plays a major role in ensuring the accuracy of this approximation. We examine the results of a basic confinement of water between corrugated wall and justify the simple LMF equation used in a previous publication. We further generalize these results to confinements that include fixed charges in order to demonstrate the broader impact of charge smoothing by sigma. The slowly-varying part of the restructured electrostatic potential will be more symmetric than the local details of confinements.

Jocelyn M. Rodgers; John D. Weeks

2008-09-17T23:59:59.000Z

97

Precipitation hardening austenitic superalloys  

DOE Patents (OSTI)

Precipitation hardening, austenitic type superalloys are described. These alloys contain 0.5 to 1.5 weight percent silicon in combination with about 0.05 to 0.5 weight percent of a post irradiation ductility enhancing agent selected from the group of hafnium, yttrium, lanthanum and scandium, alone or in combination with each other. In addition, when hafnium or yttrium are selected, reductions in irradiation induced swelling have been noted.

Korenko, Michael K. (Wexford, PA)

1985-01-01T23:59:59.000Z

98

Centrifugally driven electrostatic instability in extragalactic jets  

SciTech Connect

The stability problem of the rotation-induced electrostatic wave in extragalactic jets is presented. Solving a set of equations describing dynamics of a relativistic plasma flow of active galactic nuclei (AGN) jets, an expression of the instability rate has been derived and analyzed for typical values of AGNs. The growth rate was studied versus the wavelength and the inclination angle and it has been found that the instability process is very efficient with respect to the accretion disk evolution, indicating high efficiency of the instability.

Osmanov, Z. [Georgian National Astrophysical Observatory, Kazbegi ave. 2a, Tbilisi 0160 (Georgia)

2008-03-15T23:59:59.000Z

99

Numerical simulations on electrostatic hydrogen cyclotron instabilities  

DOE Green Energy (OSTI)

Both one- and two-dimensional particle simulation models have been used to study the nonlinear behavior of the electrostatic hydrogen cyclotron instabilities driven by the electron current along magnetic field. It is found that the instability saturates as a result of electron velocity space diffusion along magnetic field. The cyclotron waves remain highly coherent in the nonlinear stage. When the electron drift speed is comparable to thermal speed, substantial ion heating as well as particle cross-field diffusion comparable to Bohm diffusion has been observed. Comparisons of the simulation results with the theoretical predictions and the observations in both laboratory and space plasmas are discussed.

Okuda, H.; Cheng, C.Z.; Lee, W.W.

1981-02-01T23:59:59.000Z

100

ELECTROSTATIC AIR CLEANING DEVICE AND METHOD  

DOE Patents (OSTI)

A method and apparatus for utilizing friction-charged particulate material from an aerosol are described. A bed of the plastic spheres is prepared, and the aerosol is passed upwardly through the bed at a rate just large enough to maintain the bed in a fluidized state wim over-all circulation of the balls. Wire members criss-crossing through the bed rub against the balls and maintain their surfaces with electrostatic charges. The particulate material in the aerosol adheres to the surfaces of the balls.

Silverman, L.; Anderson, D.M.

1961-07-18T23:59:59.000Z

Note: This page contains sample records for the topic "include electrostatic precipitators" 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

Electrostatic generator/motor having rotors of varying ...  

Electrostatic generator/motor having rotors of varying thickness and a central stator electrically connected together into two groups United States Patent

102

Analyses of Global Monthly Precipitation Using Gauge Observations, Satellite Estimates, and Numerical Model Predictions  

Science Conference Proceedings (OSTI)

An algorithm is developed to construct global gridded fields of monthly precipitation by merging estimates from five sources of information with different characteristics, including gauge-based monthly analyses from the Global Precipitation ...

Pingping Xie; Phillip A. Arkin

1996-04-01T23:59:59.000Z

103

Estimation of Rain and Hail Rates in Mixed-Phase Precipitation  

Science Conference Proceedings (OSTI)

Precipitation comprising rain and hail is studied. Specifically, techniques to identify and quantify such precipitation in terms of rain and hail fall rates using dual polarized radar data, are presented. Included for consideration are ZH, the ...

N. Balakrishnan; D. S. Zrni?

1990-03-01T23:59:59.000Z

104

Lightning Frequency and Microphysical Properties of Precipitating Clouds over the Western North Pacific during Winter as Derived from TRMM Multisensor Observations  

Science Conference Proceedings (OSTI)

Tropical Rainfall Measuring Mission observations from multiple sensors including precipitation radar, microwave and infrared radiometers, and a lightning sensor were used to describe precipitation, lightning frequency, and microphysical ...

Yasu-Masa Kodama; Haruna Okabe; Yukie Tomisaka; Katsuya Kotono; Yoshimi Kondo; Hideyuki Kasuya

2007-06-01T23:59:59.000Z

105

Partitioning the electrostatic interaction energy between two charge distributions  

E-Print Network (OSTI)

Partitioning the electrostatic interaction energy between two charge distributions B. Jayaram*, A of the electrostatic interaction energy and examine its consequences with some prototypical charge distributions the interaction between two charge distributions as a joint venture, we explore here the possibility

Jayaram, Bhyravabotla

106

Electrostatic Free Energy and its Variations in Implicit Solvent Models  

E-Print Network (OSTI)

Electrostatic Free Energy and its Variations in Implicit Solvent Models Jianwei Che , Joachim. The unique set of such concentrations that minimize this free energy are given by the usual Boltzmann. The variation of the electrostatic free energy with respect to the location change of solute-solvent interfaces

Li, Bo

107

BNL | Aerosol, Cloud, Precipitation Interactions  

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

Cloud-Aerosol-Precipitation Interactions Cloud-Aerosol-Precipitation Interactions Atmospheric aerosols exert important "indirect effects" on clouds and climate by serving as cloud condensation nuclei (CCN) and ice nuclei that affect cloud radiative and microphysical properties. For example, an increase in CCN increases the number concentration of droplets enhances cloud albedo, and suppresses precipitation that alters cloud coverage and lifetime. However, in the case of moist and strong convective clouds, increasing aerosols may increase precipitation and enhance storm development. Although aerosol-induced indirect effects on climate are believed to have a significant impact on global climate change, estimating their impact continues to be one of the most uncertain climate forcings.

108

Hydrate Precipitation, Calcination and Environment  

Science Conference Proceedings (OSTI)

Mar 13, 2012 ... Kinetics of Boehmite Precipitation from Supersaturated Sodium Aluminates Solutions with Ethanol-Water Solvent: Wang Zhi1; Xu Rongguang1; ...

109

Radar Observations and Simulation of the Melting Layer of Precipitation  

Science Conference Proceedings (OSTI)

The melting layer in precipitation is physically modeled and compared with high resolution Doppler radar data. The model includes a new formulation of the dielectric properties and can handle all ice particles with densities ranging from pure ...

Wim Klaassen

1988-12-01T23:59:59.000Z

110

Overland Precipitation Estimation from TRMM Passive Microwave Observations  

Science Conference Proceedings (OSTI)

Procedures for passive microwave precipitation estimation over land are investigated based on a large database of Tropical Rainfall Measuring Mission (TRMM) observations. The procedures include components for rain area delineation, convective/...

Mircea Grecu; Emmanouil N. Anagnostou

2001-08-01T23:59:59.000Z

111

The Variability of Wintertime Precipitation in the Region of California  

Science Conference Proceedings (OSTI)

Rotated principal component (RPC) analysis, subject to the varimax criterion and including area weighting, is applied to a 58-yr record (1931–88) of monthly- and seasonal-mean Climatic Division precipitation anomalies for the contiguous United ...

Todd P. Mitchell; Warren Blier

1997-09-01T23:59:59.000Z

112

Diurnally Asymmetric Trends of Temperature, Humidity, and Precipitation in Taiwan  

Science Conference Proceedings (OSTI)

In this work, 45 years (1961–2005) of hourly meteorological data in Taiwan, including temperature, humidity, and precipitation, have been analyzed with emphasis on their diurnal asymmetries. A long-term decreasing trend for relative humidity (RH) ...

Chein-Jung Shiu; Shaw Chen Liu; Jen-Ping Chen

2009-11-01T23:59:59.000Z

113

Dilution physics modeling: Dissolution/precipitation chemistry  

Science Conference Proceedings (OSTI)

This report documents progress made to date on integrating dilution/precipitation chemistry and new physical models into the TEMPEST thermal-hydraulics computer code. Implementation of dissolution/precipitation chemistry models is necessary for predicting nonhomogeneous, time-dependent, physical/chemical behavior of tank wastes with and without a variety of possible engineered remediation and mitigation activities. Such behavior includes chemical reactions, gas retention, solids resuspension, solids dissolution and generation, solids settling/rising, and convective motion of physical and chemical species. Thus this model development is important from the standpoint of predicting the consequences of various engineered activities, such as mitigation by dilution, retrieval, or pretreatment, that can affect safe operations. The integration of a dissolution/precipitation chemistry module allows the various phase species concentrations to enter into the physical calculations that affect the TEMPEST hydrodynamic flow calculations. The yield strength model of non-Newtonian sludge correlates yield to a power function of solids concentration. Likewise, shear stress is concentration-dependent, and the dissolution/precipitation chemistry calculations develop the species concentration evolution that produces fluid flow resistance changes. Dilution of waste with pure water, molar concentrations of sodium hydroxide, and other chemical streams can be analyzed for the reactive species changes and hydrodynamic flow characteristics.

Onishi, Y.; Reid, H.C.; Trent, D.S.

1995-09-01T23:59:59.000Z

114

Origin of Precipitation and Dynamic Organization in Wavelike Precipitation Bands  

Science Conference Proceedings (OSTI)

Wavelike parallel precipitation bands, embedded in a layer of cirrus clouds, were studied with a vertically pointing millimetric Doppler radar. Their mean dimensions were 17 km between bands, a 50 km band length and a 6 km band width. Their ...

Richard Auria; Bernard Campistron

1987-11-01T23:59:59.000Z

115

A Precipitation Climatology of 5-Day Periods  

Science Conference Proceedings (OSTI)

A precipitation climatology has been developed for the relative frequencies of zero, one, or two or more days with measurable precipitation within 5-day periods. In addition, the distribution of precipitation amounts is given for the one wet day ...

E. S. Epstein; A. G. Barnston

1990-02-01T23:59:59.000Z

116

The Dynamic Aperture of an Electrostatic Quadrupole Lattice  

E-Print Network (OSTI)

OF AN ELECTROSTATIC QUADRUPOLE LATTICE* C.M. Celata, F.M.The dynamic aperture of such a lattice has been investigatednegligible in this short lattice), but the fact that it was

Celata, C.M.; Bieniosek, F.M.; Prost, L.; Seidl, P.A.; Friedman, A.; Grote, D.P.

2005-01-01T23:59:59.000Z

117

The KACST Heavy?Ion Electrostatic Storage Ring  

Science Conference Proceedings (OSTI)

A novel Electrostatic Storage Ring (ESR) for beams at energies up to 30keV/q is now being constructed at the National Centre for Mathematics and Physics (NCMP)

A. A. Almuqhim; S. M. Alshammari; M. O. A. El Ghazaly; A. I. Papash; C. P. Welsch

2011-01-01T23:59:59.000Z

118

An empirical model of collective electrostatic effects for laser-beam channeling in long-scale-length relativistic plasmas  

Science Conference Proceedings (OSTI)

This work investigates the capability of ultraintense lasers with irradiance from 10{sup 18} to 10{sup 21} W cm{sup -2} to produce highly energetic electron beams from a Gaussian focus in a low-density plasma. A simple particle simulation code including a physical model of collective electrostatic effects in relativistic plasmas has been developed. Without electrostatic fields, free electrons escape from the Gaussian focal region of a 10-ps petawatt laser pulse very quickly, well before the laser field reaches its maximum amplitude. However, it has been demonstrated that the electrostatic field generated by the electron flow is able to strongly modify the range and direction of the laser-generated MeV electrons by allowing trapped electrons to experience much higher laser-intensity peaks along their trajectories. This modeling predicts some collimation but not enough to meet the requirements of fast ignition.

Yang, Jeong-Hoon; Craxton, R. Stephen [Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623 (United States)

2011-08-15T23:59:59.000Z

119

Precipitation Patterns in West Africa  

Science Conference Proceedings (OSTI)

A regional precipitation analysis from a total of 813 recording stations in 11 West African countries for the drought period 1968–75 is presented. Results illustrate the severity and extent of meteorological drought which prevailed throughout the ...

Raymond P. Motha; Sharon K. Leduc; Louis T. Steyaert; Clarence M. Sakamoto; Norton D. Strommen

1980-10-01T23:59:59.000Z

120

Estimation of Continental Precipitation Recycling  

Science Conference Proceedings (OSTI)

The total amount of water that precipitates on large continental regions is supplied by two mechanisms: 1) advection from the surrounding areas external to the region and 2) evaporation and transpiration from the land surface within the region. ...

Kaye L. Brubaker; Dara Entekhabi; P. S. Eagleson

1993-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "include electrostatic precipitators" 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

High-Strength Alloys; Precipitation  

Science Conference Proceedings (OSTI)

Mar 1, 2011 ... Precipitation Hardenable Mg-Ca-Al Alloys: J. Jayaraj1; C.L. Mendis1; T. Ohkubo1 ; K. Oh-ishi1; K. Hono1; 1National Institute for Materials ...

122

Some Statistics of Instantaneous Precipitation  

Science Conference Proceedings (OSTI)

Known sources of data from arrays of instantaneous precipitation intensity recorders in southern Germany, east-central Illinois, northeastern Illinois, central Florida, and Hilo, Hawaii are obtained. These data are analyzed for line averages of ...

Douglas M. A. Jones; Wayne M. Wendland

1984-09-01T23:59:59.000Z

123

Tropical Influences on California Precipitation  

Science Conference Proceedings (OSTI)

Atmospheric circulation anomalies and hydrologic processes associated with California wet and dry events were examined during Northern Hemisphere winter. The precipitation anomaly over the west coast of North America shows a north–south three-...

Kingtse C. Mo; R. Wayne Higgins

1998-03-01T23:59:59.000Z

124

Teleconnections with Tropical Precipitation Surges  

Science Conference Proceedings (OSTI)

Precipitation surges in the equatorial Pacific “dry zone” (as delineated in a study by Doberitz) reveal statistically significant teleconnections with midlatitude tropospheric flow patterns during all seasons. These connections are strongest, ...

Elmar R. Reiter

1983-07-01T23:59:59.000Z

125

Electrostatic Transport and Manipulation of Lunar Soil and Dust  

SciTech Connect

Transport and manipulation technologies of lunar soil and dust are under development utilizing the electrostatic force. Transport of particles is realized by an electrostatic conveyer consisting of parallel electrodes. Four-phase traveling electrostatic wave was applied to the electrodes to transport particles upon the conveyer and it was demonstrated that particles were efficiently transported under conditions of low frequency, high voltage, and the application of rectangular wave. Not only linear but also curved and closed transport was demonstrated. Numerical investigation was carried out with a three-dimensional hard-sphere model of the Distinct Element Method to clarify the mechanism of the transport and to predict performances in the lunar environment. This technology is expected to be utilized not only for the transport of bulk soil but also for the cleaning of a solar panel and an optical lens. Another technology is an electrostatic manipulation system to manipulate single particle. A manipulator consisted of two parallel pin electrodes. When voltage was applied between the electrodes, electrophoresis force generated in non-uniform electrostatic field was applied to the particle near the tip of the electrode. The particle was captured by the application of the voltage and released from the manipulator by turning off the voltage. It was possible to manipulate not only insulative but also conductive particles. Three-dimensional electrostatic field calculation was conducted to calculate the electrophoresis force and the Coulomb force.

Kawamoto, Hiroyuki [Department of Applied Mechanics and Aerospace Engineering, Waseda University 3-4-1, Okubo, Shinjuku, Tokyo 169-8555 (Japan)

2008-01-21T23:59:59.000Z

126

Statistical Analysis of Precipitation Chemistry Measurements over the Eastern United States. Part III: The Ionic Balance among Chemical Constituents  

Science Conference Proceedings (OSTI)

The relationships between acidity and the principal chemical constituents of precipitation (including sulfate, nitrate, ammonium, calcium, magnesium, sodium, and chloride) were investigated using a new archive of daily precipitation chemistry ...

Ronald J. Ferek; Barrett P. Eynon; Roy M. Endlich

1988-12-01T23:59:59.000Z

127

Statistical Analysis of Precipitation Chemistry Measurements over the Eastern United States. Part I: Seasonal and Regional Patterns and Correlations  

Science Conference Proceedings (OSTI)

This paper describes the behavior of the chemical constituents in precipitation, including their typical concentrations and ranges, regional patterns, and seasonal changes. Daily precipitation measurements for the period 1978 through 1983 over ...

R. M. Endlich; B. P. Eymon; R. J. Ferek; A. D. Valdes; C. Maxwell

1988-12-01T23:59:59.000Z

128

Thermodynamic Bounds on Nonlinear Electrostatic Perturbations in Intense Charged Particle Beams  

Science Conference Proceedings (OSTI)

This paper places a lowest upper bound on the field energy in electrostatic perturbations in single-species charged particle beams with initial temperature anisotropy (TllT? thermodynamic bound on the field perturbation energy of the instabilities is obtained from the nonlinear Vlasov-Poisson equations for an arbitrary initial distribution function, including the effects of intense self-fields, finite geometry and nonlinear processes. This paper also includes analytical estimates of the nonlinear bounds for space-charge-dominated and emittance-dominated anisotropic bi-Maxwellian distributions.

Nikolas C. Logan and Ronald C. Davidson

2012-07-18T23:59:59.000Z

129

Timber Mountain Precipitation Monitoring Station  

SciTech Connect

A precipitation monitoring station was placed on the west flank of Timber Mountain during the year 2010. It is located in an isolated highland area near the western border of the Nevada National Security Site (NNSS), south of Pahute Mesa. The cost of the equipment, permitting, and installation was provided by the Environmental Monitoring Systems Initiative (EMSI) project. Data collection, analysis, and maintenance of the station during fiscal year 2011 was funded by the U.S. Department of Energy, National Nuclear Security Administration, Nevada Site Office Environmental Restoration, Soils Activity. The station is located near the western headwaters of Forty Mile Wash on the Nevada Test and Training Range (NTTR). Overland flows from precipitation events that occur in the Timber Mountain high elevation area cross several of the contaminated Soils project CAU (Corrective Action Unit) sites located in the Forty Mile Wash watershed. Rain-on-snow events in the early winter and spring around Timber Mountain have contributed to several significant flow events in Forty Mile Wash. The data from the new precipitation gauge at Timber Mountain will provide important information for determining runoff response to precipitation events in this area of the NNSS. Timber Mountain is also a groundwater recharge area, and estimation of recharge from precipitation was important for the EMSI project in determining groundwater flowpaths and designing effective groundwater monitoring for Yucca Mountain. Recharge estimation additionally provides benefit to the Underground Test Area Sub-project analysis of groundwater flow direction and velocity from nuclear test areas on Pahute Mesa. Additionally, this site provides data that has been used during wild fire events and provided a singular monitoring location of the extreme precipitation events during December 2010 (see data section for more details). This letter report provides a summary of the site location, equipment, and data collected in fiscal year 2011.

Lyles Brad,McCurdy Greg,Chapman Jenny,Miller Julianne

2012-01-01T23:59:59.000Z

130

Moored Observations of Precipitation Temperature  

Science Conference Proceedings (OSTI)

Direct observations of precipitation temperature were made from a surface buoy deployed for four months in the western Pacific warm pool. The observed rain droplet temperatures are equal to the wet-bulb temperature to within the measured wet-bulb ...

Steven P. Anderson; Alan Hinton; Robert A. Weller

1998-08-01T23:59:59.000Z

131

Laboratory Measurements of Electrostatic Solitary Structures Generated by Beam Injection  

SciTech Connect

Electrostatic solitary structures are generated by injection of a suprathermal electron beam parallel to the magnetic field in a laboratory plasma. Electric microprobes with tips smaller than the Debye length ({lambda}{sub De}) enabled the measurement of positive potential pulses with half-widths 4 to 25{lambda}{sub De} and velocities 1 to 3 times the background electron thermal speed. Nonlinear wave packets of similar velocities and scales are also observed, indicating that the two descend from the same mode which is consistent with the electrostatic whistler mode and result from an instability likely to be driven by field-aligned currents.

Lefebvre, Bertrand; Chen, Li-Jen [Space Science Center, University of New Hampshire, Durham, New Hampshire 03824 (United States); Gekelman, Walter; Pribyl, Patrick; Vincena, Stephen [Basic Plasma Science Facility, University of California, Los Angeles, California 90095 (United States); Kintner, Paul [School of Electrical and Computer Engineering, Cornell University, Ithaca, New York 14853 (United States); Pickett, Jolene [Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242 (United States); Chiang, Franklin; Judy, Jack [Electrical Engineering Department, University of California, Los Angeles, California 90095 (United States)

2010-09-10T23:59:59.000Z

132

Transverse-structure electrostatic charged particle beam lens  

DOE Patents (OSTI)

Electrostatic particle-beam lenses using a concentric co-planar array of independently biased rings can be advantageous for some applications. Traditional electrostatic lenses often consist of axial series of biased rings, apertures, or tubes. The science of lens design has devoted much attention to finding axial arrangements that compensate for the substantial optical aberrations of the individual elements. Thus, as with multi-element lenses for light, a multi-element charged-particle lens can have optical behavior that is far superior to that of the individual elements. Transverse multiple-concentric-ring lenses achieve high performance, while also having advantages in terms of compactness and optical versatility. 7 figs.

Moran, M.J.

1998-10-13T23:59:59.000Z

133

Transverse-structure electrostatic charged particle beam lens  

DOE Patents (OSTI)

Electrostatic particle-beam lenses using a concentric co-planar array of independently biased rings can be advantageous for some applications. Traditional electrostatic lenses often consist of axial series of biased rings, apertures, or tubes. The science of lens design has devoted much attention to finding axial arrangements that compensate for the substantial optical aberrations of the individual elements. Thus, as with multi-element lenses for light, a multi-element charged-particle lens can have optical behavior that is far superior to that of the individual elements. Transverse multiple-concentric-ring lenses achieve high performance, while also having advantages in terms of compactness and optical versatility.

Moran, Michael J. (Pleasanton, CA)

1998-01-01T23:59:59.000Z

134

Oblique propagation of nonlinear electrostatic waves in dense astrophysical magnetoplasmas  

SciTech Connect

Nonlinear quantum ion-acoustic waves in dense dissipative as well as non-dissipative magnetized plasmas are investigated employing the quantum hydrodynamic model. In this regard, Zakharov Kuznetsov Burgers equation is derived in quantum plasmas, for the first time, using the small amplitude perturbation expansion method. The unique features of nonlinear electrostatic structures in pure electron-ion quantum magnetoplasma are highlighted and the parametric domain of the applicability of the model is unequivocally expressed. The present study may be useful to understand the nonlinear propagation characteristics of electrostatic shock and solitary structures in dense astrophysical systems where the quantum effects are expected to dominate.

Masood, W.; Siddiq, M. [Theoretical Plasma Physics Division, PINSTECH, P. O. Nilore, Islamabad 54000 (Pakistan); National Centre for Physics (NCP), Shahdara Valley Road, 44000, Islamabad (Pakistan); Rizvi, H. [Theoretical Plasma Physics Division, PINSTECH, P. O. Nilore, Islamabad 54000 (Pakistan)

2011-10-15T23:59:59.000Z

135

Predicting Hurricane Landfall Precipitation: Optimistic and Pessimistic Views from the Symposium on Precipitation Extremes  

Science Conference Proceedings (OSTI)

The Symposium on Precipitation Extremes was one of two special symposia organized for the American Meteorological Society national meeting. This symposium was organized into sessions on winter precipitation, summer precipitation, and hurricane-...

Russell L. Elsberry

2002-09-01T23:59:59.000Z

136

Trends in Total Precipitation and Frequency of Daily Precipitation Extremes over China  

Science Conference Proceedings (OSTI)

Based on a newly developed daily precipitation dataset of 740 stations in China and more robust trend detection techniques, trends in annual and seasonal total precipitation and in extreme daily precipitation, defined as those larger than its ...

Panmao Zhai; Xuebin Zhang; Hui Wan; Xiaohua Pan

2005-04-01T23:59:59.000Z

137

The Version-2 Global Precipitation Climatology Project (GPCP) Monthly Precipitation Analysis (1979–Present)  

Science Conference Proceedings (OSTI)

The Global Precipitation Climatology Project (GPCP) Version-2 Monthly Precipitation Analysis is described. This globally complete, monthly analysis of surface precipitation at 2.5° latitude × 2.5° longitude resolution is available from January ...

Robert F. Adler; George J. Huffman; Alfred Chang; Ralph Ferraro; Ping-Ping Xie; John Janowiak; Bruno Rudolf; Udo Schneider; Scott Curtis; David Bolvin; Arnold Gruber; Joel Susskind; Philip Arkin; Eric Nelkin

2003-12-01T23:59:59.000Z

138

Investigation of electrostatic waves in the ion cyclotron range of frequencies in L-4 and ACT-1  

SciTech Connect

Electrostatic waves in the ion cyclotron range of frequencies (ICRF) were studied in the Princeton L-4 and ACT-1 devices for approximately ten years, from 1975 to 1985. The investigation began in the L-4 linear device, looking for the parametric excitation of electrostatic ion cyclotron waves in multi-ion-species plasmas. In addition, this investigation verified multi-ion-species effects on the electrostatic ion cyclotron wave dispersion religion including the ion-ion hybrid resonance. Finite-Larmor-radius modification of the wave dispersion relation was also observed, even for ion temperatures of T{sub i} {approx} 1/40 eV. Taking advantage of the relatively high field and long device length of L-4, the existence of the cold electrostatic ion cyclotron wave (CES ICW) was verified. With the arrival of the ACT-1 toroidal device, finite-Larmor-radius (FLR) waves were studied in a relatively collisionless warm-ion hydrogen plasma. Detailed investigations of ion Bernstein waves (IBW) included the verification of mode-transformation in their launching, their wave propagation characteristics, their absorption, and the resulting ion heating. This basic physics activity played a crucial role in developing a new reactor heating concept termed ion Bernstein wave heating. Experimental research in the lower hybrid frequency range confirmed the existence of FLR effects near the lower hybrid resonance, predicted by Stix in 1965. In a neon plasma with a carefully placed phased wave exciter, the neutralized ion Bernstein wave was observed for the first time. Using a fastwave ICRF antenna, two parasitic excitation processes for IBW -- parametric instability and density-gradient-driven excitation -- were also discovered. In the concluding section of this paper, a possible application of externally launched electrostatic waves is suggested for helium ash removal from fusion reactor plasmas.

Ono, Masayuki

1993-05-01T23:59:59.000Z

139

Investigation of electrostatic waves in the ion cyclotron range of frequencies in L-4 and ACT-1  

SciTech Connect

Electrostatic waves in the ion cyclotron range of frequencies (ICRF) were studied in the Princeton L-4 and ACT-1 devices for approximately ten years, from 1975 to 1985. The investigation began in the L-4 linear device, looking for the parametric excitation of electrostatic ion cyclotron waves in multi-ion-species plasmas. In addition, this investigation verified multi-ion-species effects on the electrostatic ion cyclotron wave dispersion religion including the ion-ion hybrid resonance. Finite-Larmor-radius modification of the wave dispersion relation was also observed, even for ion temperatures of T[sub i] [approx] 1/40 eV. Taking advantage of the relatively high field and long device length of L-4, the existence of the cold electrostatic ion cyclotron wave (CES ICW) was verified. With the arrival of the ACT-1 toroidal device, finite-Larmor-radius (FLR) waves were studied in a relatively collisionless warm-ion hydrogen plasma. Detailed investigations of ion Bernstein waves (IBW) included the verification of mode-transformation in their launching, their wave propagation characteristics, their absorption, and the resulting ion heating. This basic physics activity played a crucial role in developing a new reactor heating concept termed ion Bernstein wave heating. Experimental research in the lower hybrid frequency range confirmed the existence of FLR effects near the lower hybrid resonance, predicted by Stix in 1965. In a neon plasma with a carefully placed phased wave exciter, the neutralized ion Bernstein wave was observed for the first time. Using a fastwave ICRF antenna, two parasitic excitation processes for IBW -- parametric instability and density-gradient-driven excitation -- were also discovered. In the concluding section of this paper, a possible application of externally launched electrostatic waves is suggested for helium ash removal from fusion reactor plasmas.

Ono, Masayuki.

1993-05-01T23:59:59.000Z

140

Inducing Mineral Precipitation in Groundwater by Addition of Phosphate  

SciTech Connect

Induced precipitation of phosphate minerals to scavenge trace metals and radionuclides from groundwater is a potential remediation approach for contaminated aquifers. Phosphate minerals can sequester trace elements by primary mineral formation, solid solution formation and/or adsorption, and they are poorly soluble under many environmental conditions, making them attractive for long-term sustainable remediation. The success of such engineered schemes will depend on the particular mineral phases generated, their rates of formation, and their long term stability. The purpose of this study was to examine the precipitation of calcium phosphate minerals under conditions representative of a natural groundwater. Because microorganisms are present in groundwater, and because some proposed schemes for induced phosphate mineral precipitation rely on the stimulation of native groundwater populations, we also tested the effect of bacterial cells (initial densities of 105 and 107 ml-1) within the precipitation medium. We also tested the effect of a trace mixture of propionic, isovaleric, formic and butyric acids (total concentration 0.035 mM). The experiments showed that the general progression of mineral precipitation was similar under all of the conditions, with initial formation of amorphous calcium carbonate, and transformation to poorly crystalline hydroxyapatite (HAP) by the end of the week-long experiments. The presence of the bacterial cells appeared to delay precipitation, although by the end of 7 days the overall extent of precipitation was similar for all of the treatments. The stoichiometry of the final precipitates as well as results of Rietveld refinement of x-ray diffraction data indicated that the treatments including organic acids and bacterial cells resulted in increased distortion of the HAP crystal lattice, with the higher concentration of cells resulting in the greatest distortion. Uptake of Sr into the phosphate minerals was decreased in the treatments with cells and organic acids, compared to the control. The results of the experiments enable a greater understanding of the challenges associated with phosphate-based remediation schemes for contaminated environments.

Karen E. Wright; Yoshiko Fujita; Thomas Hartmann; Mark Conrad

2011-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "include electrostatic precipitators" 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

Seasonal Cycles of Precipitation and Precipitable Water and Their Use in Monsoon Onset and Retreat .  

E-Print Network (OSTI)

??Precipitation (P) and precipitable water (W) are important components of the hydrological cycles in the earth system, and their seasonal cycles are closely related to… (more)

Lu, Er

2005-01-01T23:59:59.000Z

142

Monte Carlo simulation of ferroelectric domain structure: Electrostatic and elastic strain energy contributions  

DOE Green Energy (OSTI)

A lattice-Monte Carlo approach was developed to simulate ferroelectric domain behavior. The model utilizes a Hamiltonian for the total energy that includes electrostatic terms (involving dipole-dipole interactions, local polarization gradients, and applied electric field), and elastic strain energy. The contributions of these energy components to the domain structure and to the overall applied field response of the system were examined. In general, the model exhibited domain structure characteristics consistent with those observed in a tetragonally distorted ferroelectric. Good qualitative agreement between the appearance of simulated electrical hysteresis loops and those characteristic of real ferroelectric materials was found.

POTTER JR.,BARRETT G.; TUTTLE,BRUCE A.; TIKARE,VEENA

2000-04-04T23:59:59.000Z

143

Simulation of an Electrostatic Energy Harvester at Large Amplitude Narrow and Wide Band Vibrations  

E-Print Network (OSTI)

An electrostatic in-plane overlap varying energy harvester is modeled and simulated using a circuit simulator. Both linear and nonlinear models are investigated. The nonlinear model includes mechanical stoppers at the displacement extremes. Large amplitude excitation signals, both narrow and wide band, are used to emulate environmental vibrations. Nonlinear behavior is significant at large displacement due to the impact on mechanical stoppers. For a sinusoidal excitation the mechanical stoppers cause the output power to flatten and weakly decrease. For a wide band excitation, the output power first increases linearly with the power spectral density of the input signal, then grows slower than linearly.

Tvedt, Lars Geir Whist; Halvorsen, Einar

2008-01-01T23:59:59.000Z

144

Investigation of Enhanced Heat Transfer Coefficient with an Electrostatic Grid  

Science Conference Proceedings (OSTI)

Some major contributors to efficiency loss in a fossil or nuclear plant are associated with nucleation of moisture from superheated steam, formation and release of liquid films on turbine surfaces, and the flow and condensation of moist steam into the turbine exhaust and condenser. This report investigates the possible effect of an electrostatic charge on these processes and therefore on heat transfer.

2004-09-15T23:59:59.000Z

145

Pulse drive and capacitance measurement circuit for MEMS electrostatic actuators  

Science Conference Proceedings (OSTI)

In this paper we present an electronic circuit for position or capacitance estimation of MEMS electrostatic actuators based on a switched capacitor technique. The circuit uses a capacitive divider configuration composed by a fixed capacitor and the variable ... Keywords: Capacitance, Capacitive divider, Distance estimation, MEMS, Pulsed digital oscillators

Daniel Fernández; Jordi Madrenas; Manuel Domínguez; Joan Pons; Jordi Ricart

2008-12-01T23:59:59.000Z

146

The Role of the Electrostatic Force in Spore Adhesion  

SciTech Connect

Electrostatic force is investigated as one of the components of the adhesion force between Bacillus thuringiensis (Bt) spores and planar surfaces. The surface potentials of a Bt spore and a mica surface are experimentally obtained using a combined atomic force microscopy (AFM)-scanning surface potential microscopy technique. On the basis of experimental information, the surface charge density of the spores is estimated at 0.03 {micro}C/cm{sup 2} at 20% relative humidity and decreases with increasing humidity. The Coulombic force is introduced for the spore-mica system (both charged, nonconductive surfaces), and an electrostatic image force is introduced to the spore-gold system because gold is electrically conductive. The Coulombic force for spore-mica is repulsive because the components are similarly charged, while the image force for the spore-gold system is attractive. The magnitude of both forces decreases with increasing humidity. The electrostatic forces are added to other force components, e.g., van der Waals and capillary forces, to obtain the adhesion force for each system. The adhesion forces measured by AFM are compared to the estimated values. It is shown that the electrostatic (Coulombic and image) forces play a significant role in the adhesion force between spores and planar surfaces.

Chung, Eunhyea [Georgia Institute of Technology; Yiacoumi, Sotira [Georgia Institute of Technology; Lee, Ida [University of Tennessee, Knoxville (UTK); Tsouris, Costas [ORNL

2010-01-01T23:59:59.000Z

147

Electrostatic quadrupole focused particle accelerating assembly with laminar flow beam  

DOE Patents (OSTI)

A charged particle accelerating assembly provided with a predetermined ratio of parametric structural characteristics and with related operating voltages applied to each of its linearly spaced focusing and accelerating quadrupoles, thereby to maintain a particle beam traversing the electrostatic fields of the quadrupoles in the assembly in an essentially laminar flow through the assembly.

Maschke, A.W.

1984-04-16T23:59:59.000Z

148

On a class of inverse electrostatic and elasticity problems  

E-Print Network (OSTI)

We study the inverse electrostatic and elasticity problems associated with Poisson and Navier equations. The uniqueness of solutions of these problems is proved for piecewise constant electric charge and internal stress distributions having a checkered structure: they are constant on rectangular blocks. Such distributions appear naturally in practical applications. We also discuss computational challenges arising in the numerical implementation of our method.

Andrei Artemev; Leonid Parnovski; Iosif Polterovich

2012-09-29T23:59:59.000Z

149

Bounding the electrostatic free energies associated with linear continuum models of molecular solvation  

Science Conference Proceedings (OSTI)

The importance of electrostatic interactions in molecular biology has driven extensive research toward the development of accurate and efficient theoretical and computational models. Linear continuum electrostatic theory has been surprisingly successful

Jaydeep P. Bardhan; Matthew G. Knepley; Mihai Anitescu

2009-01-01T23:59:59.000Z

150

Evaluation of LFM-2 Quantitative Precipitation Forecasts  

Science Conference Proceedings (OSTI)

The results of a near real time experiment designed to assess the state of the art of quantitative precipitation forecasting skill of the operational NMC LFM-2 are described. All available LFM-2 quantitative precipitation forecasts were verified ...

Lance F. Bosart

1980-08-01T23:59:59.000Z

151

The Accuracy of United States Precipitation Data  

Science Conference Proceedings (OSTI)

Precipitation measurements in the United States (as well as all other countries) are adversely affected by the gauge undercatch bias of point precipitation measurements. When these measurements are used to obtain areas averages, particularly in ...

Pavel Ya Groisman; David R. Legates

1994-02-01T23:59:59.000Z

152

The Environmental Influence on Tropical Cyclone Precipitation  

Science Conference Proceedings (OSTI)

The intensity, spatial, and temporal changes in precipitation were examined in three North Atlantic hurricanes during 1989 (Dean, Gabrielle, and Hugo) using precipitation estimates made from Special Sensor Microwave/Imager (SSM/I) measurements. ...

Edward B. Rodgers; Jong-Jin Baik; Harold F. Pierce

1994-05-01T23:59:59.000Z

153

Predictability of Precipitation Patterns: An Operational Approach  

Science Conference Proceedings (OSTI)

Predictability, defined as the ability to forecast precipitation over an area by Lagrangian persistence, is studied for 11 radar precipitation patterns. After a time ranging between 40 and 112 min, depending on individual cases, all forecast ...

I. Zawadzki; J. Morneau; R. Laprise

1994-12-01T23:59:59.000Z

154

Precipitable Water Measurements with Sun Photometers  

Science Conference Proceedings (OSTI)

This paper presents a brief history of spectroscopic and radiometric methods of remotely sensing precipitable water. We demonstrate a new method of calibrating sun photometers with microwave radiometer data to obtain precipitable water, and a new ...

R. E. Bird; R. L. Hulstrom

1982-08-01T23:59:59.000Z

155

Response of Tropical Precipitation to Global Warming  

Science Conference Proceedings (OSTI)

Using high-resolution cloud-resolving simulations with different CO2 concentrations, local precipitation fluxes are found to obey Clausius–Clapeyron (CC) scaling. Previous studies of the effect of CO2 concentration on precipitation extremes have ...

David M. Romps

2011-01-01T23:59:59.000Z

156

Precipitation Trends on the Canadian Prairies  

Science Conference Proceedings (OSTI)

The Canadian prairies are a major producer of grain, much of which is produced under rain-fed agriculture. The amount and timing of precipitation are critical to grain production. Information on the precipitation trend is therefore vital to this ...

O. O. Akinremi; S. M. McGinn; H. W. Cutforth

1999-10-01T23:59:59.000Z

157

Precipitation Behavior in AEREX(TM) 350  

Science Conference Proceedings (OSTI)

The precipitates are examined in the scanning electron microscope. In addition, the relationship between the microstructure and mechanical properties are ...

158

Methods and sorbents for utilizing a hot-side electrostatic precipitator for removal of mercury from combustion gases  

Science Conference Proceedings (OSTI)

Methods are provided for reducing emission of mercury from a gas stream by treating the gas with carbonaceous mercury sorbent particles to reduce the mercury content of the gas; collecting the carbonaceous mercury sorbent particles on collection plates of a hot-side ESP; periodically rapping the collection plates to release a substantial portion of the collected carbonaceous mercury sorbent particles into hoppers; and periodically emptying the hoppers, wherein such rapping and emptying are done at rates such that less than 70% of mercury adsorbed onto the mercury sorbent desorbs from the collected mercury sorbent into the gas stream.

Nelson, Sidney (Hudson, OH)

2011-02-15T23:59:59.000Z

159

Study on plasma parameters and dust charging in an electrostatically plugged multicusp plasma device  

Science Conference Proceedings (OSTI)

The effect of the electrostatic confinement potential on the charging of dust grains and its relationship with the plasma parameters has been studied in an electrostatically plugged multicusp dusty plasma device. Electrostatic plugging is implemented by biasing the electrically isolated magnetic multicusp channel walls. The experimental results show that voltage applied to the channel walls can be a controlling parameter for dust charging.

Kakati, B.; Kausik, S. S.; Saikia, B. K. [Centre of Plasma Physics, Institute for Plasma Research, Nazirakhat, Sonapur-782 402, Kamrup, Assam (India); Bandyopadhyay, M. [ITER-India, Institute for Plasma Research, Bhat, Gandhinagar- 382 428 (India)

2011-06-15T23:59:59.000Z

160

Electrostatic force assisted deposition of graphene  

Science Conference Proceedings (OSTI)

An embodiment of a method of depositing graphene includes bringing a stamp into contact with a substrate over a contact area. The stamp has at least a few layers of the graphene covering the contact area. An electric field is developed over the contact area. The stamp is removed from the vicinity of the substrate which leaves at least a layer of the graphene substantially covering the contact area.

Liang, Xiaogan (Berkeley, CA)

2011-11-15T23:59:59.000Z

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


161

Technology for the control of particulates and sulfur oxides by electrostatic techniques. Final report, Aug 85-Jul 90  

Science Conference Proceedings (OSTI)

The report summarizes research performed by Southern Research Institute on several aspects of the E-SOx Process, invented by EPA to jointly control particulate matter and SO2 in coal-fired boiler emissions by retrofitting an existing electrostatic precipitator (ESP), formerly used only for particulate removal. The report covers research on potential ESP sites for process application, process economics, characterization of process solid waste collected in the ESP, measurement and modeling of prechargers in the retrofitted ESP, and effectiveness of the process with respect to SO2 removal. Experiment results described in the report confirm original EPA laboratory work and were influential in the decision to proceed with a large pilot evaluation of E-SOx. Research emphasis was on ESP performance, under E-SOx conditions, to verify that this essential equipment process component could retain its primary function of particle removal at a level equal to removal prior to modifications necessary for E-SOx. Further research is suggested.

Dismukes, E.B.; Gooch, J.P.

1991-03-01T23:59:59.000Z

162

Electrostatic waves in a relativistic and anisotropic plasma stream electron waves and ion-acoustic mode: Fusion instability  

SciTech Connect

The electrostatic dispersion and instabilities for an anisotropic relativistic plasma stream are analytically studied for various regimes with streaming dissipation relevant to the analysis of fusion and turbulence in beam-plasma and wave-plasma interaction. It reveals the modified spectrum of streaming dispersion and onset of instability at nonrelativistic temperatures suitable for space, at moderately relativistic temperature including fusion, and at ultrarelativistic temperature limit relevant to astrophysical plasmas and pulsars.

Mohanty, J.N.

1983-11-01T23:59:59.000Z

163

Continuous Precipitation of Ceria Nanoparticles from a Continuous Flow Micromixer  

SciTech Connect

Cerium oxide nanoparticles were continuously precipitated from a solution of cerium(III) nitrate and ammonium hydroxide using a micro-scale T-mixer. Findings show that the method of mixing is important in the ceria precipitation process. In batch mixing and deposition, disintegration and agglomeration dominates the deposited film. In T-mixing and deposition, more uniform nanorod particles are attainable. In addition, it was found that the micromixing approach reduced the exposure of the Ce(OH)3 precipates to oxygen, yielding hydroxide precipates in place of CeO2 precipitates. Advantages of the micro-scale T-mixing approach include shorter mixing times, better control of nanoparticle shape and less agglomeration.

Tseng, Chih Heng; Paul, Brian; Chang, Chih-hung; Engelhard, Mark H.

2013-01-01T23:59:59.000Z

164

PRECIPITATION METHOD OF SEPARATING PLUTONIUM FROM CONTAMINATING ELEMENTS  

DOE Patents (OSTI)

This patent relates to an improved method for the decontamination of plutonium. The process consists broadly in an improvement in a method for recovering plutonium from radioactive uranium fission products in aqueous solutions by decontamination steps including byproduct carrier precipitation comprising the step of introducing a preformed aqueous slurry of a hydroxide of a metal of group IV B into any aqueous acidic solution which contains the plutonium in the hexavalent state, radioactive uranium fission products contaminant and a by-product carrier precipitate and separating the metal hydroxide and by-product precipitate from the solution. The process of this invention is especially useful in the separation of plutonium from radioactive zirconium and columbium fission products.

Sutton, J.B.

1958-02-18T23:59:59.000Z

165

Inductive and Electrostatic Acceleration in Relativistic Jet-Plasma Interactions  

Science Conference Proceedings (OSTI)

We report on the observation of rapid particle acceleration in numerical simulations of relativistic jet-plasma interactions and discuss the underlying mechanisms. The dynamics of a charge-neutral, narrow, electron-positron jet propagating through an unmagnetized electron-ion plasma was investigated using a three-dimensional, electromagnetic, particle-in-cell computer code. The interaction excited magnetic filamentation as well as electrostatic (longitudinal) plasma instabilities. In some cases, the longitudinal electric fields generated inductively and electrostatically reached the cold plasma wave-breaking limit, and the longitudinal momentum of about half the positrons increased by 50% with a maximum gain exceeding a factor of two. The results are relevant to understanding the micro-physics at the interface region of an astrophysical jet with the interstellar plasma, for example, the edge of a wide jet or the jet-termination point.

Ng, Johnny S.T.; Noble, Robert J.; /SLAC

2005-07-13T23:59:59.000Z

166

ELECTROSTATIC MODELING OF THE JEFFERSON LABORATORY INVERTED CERAMIC GUN  

SciTech Connect

Jefferson Laboratory (JLab) is currently developing a new 500kV DC electron gun for future use with the FEL. The design consists of two inverted ceramics which support a central cathode electrode. This layout allows for a load-lock system to be located behind the gun chamber. The electrostatic geometry of the gun has been designed to minimize surface electric field gradients and also to provide some transverse focusing to the electron beam during transit between the cathode and anode. This paper discusses the electrode design philosophy and presents the results of electrostatic simulations. The electric field information obtained through modeling was used with particle tracking codes to predict the effects on the electron beam.

P. Evtushenko ,F.E. Hannon, C. Hernandez-Garcia

2010-05-01T23:59:59.000Z

167

Electrostatic lens to focus an ion beam to uniform density  

SciTech Connect

A focusing lens for an ion beam having a gaussian or similar density profile is provided. The lens is constructed to provide an inner zero electrostatic field, and an outer electrostatic field such that ions entering this outer field are deflected by an amount that is a function of their distance from the edge of the inner field. The result is a beam that focuses to a uniform density in a manner analogous to that of an optical ring lens. In one embodiment, a conically-shaped network of fine wires is enclosed within a cylindrical anode. The wire net together with the anode produces a voltage field that re-directs the outer particles of the beam while the axial particles pass undeflected through a zero field inside the wire net. The result is a focused beam having a uniform intensity over a given target area and at a given distance from the lens.

Johnson, Cleland H. (Oak Ridge, TN)

1977-01-11T23:59:59.000Z

168

Electrostatic Interaction of Heterogeneously Charged Surfaces with Semipermeable Membranes  

E-Print Network (OSTI)

In this paper we study the electrostatic interaction of a heterogeneously charged wall with a neutral semipermeable membrane. The wall consists of periodic stripes, where the charge density varies in one direction. The membrane is in a contact with a bulk reservoir of an electrolyte solution and separated from the wall by a thin film of salt-free liquid. One type of ions (small counterions) permeates into the gap and gives rise to a distance-dependent membrane potential, which translates into a repulsive electrostatic disjoining pressure due to an overlap of counterion clouds in the gap. To quantify it we use two complementary approaches. First, we propose a mean-field theory based on a linearized Poisson-Boltzmann equation and Fourier analysis. These calculations allow us to estimate the effect of a heterogeneous charge pattern at the wall on the induced heterogeneous membrane potential, and the value of the disjoining pressure as a function of the gap. Second, we perform Langevin dynamics simulations of the same system with explicit ions. The results of the two approaches are in good agreement with each other at low surface charge and small gap, but differ due to nonlinearity at the higher charge. These results demonstrate that a heterogeneity of the wall charge can lead to a huge reduction in the electrostatic repulsion, which could dramatically facilitate a self-assembly in complex synthetic and biological systems.

Salim R. Maduar; Vladimir Lobaskin; Olga I. Vinogradova

2013-07-17T23:59:59.000Z

169

Chromatin ionic atmosphere analyzed by a mesoscale electrostatic approach  

E-Print Network (OSTI)

ABSTRACT Characterizing the ionic distribution around chromatin is important for understanding the electrostatic forces governing chromatin structure and function. Here we develop an electrostatic model to handle multivalent ions and compute the ionic distribution around a mesoscale chromatin model as a function of conformation, number of nucleosome cores, and ionic strength and species using Poisson-Boltzmann theory. This approach enables us to visualize and measure the complex patterns of counterion condensation around chromatin by examining ionic densities, free energies, shielding charges, and correlations of shielding charges around the nucleosome core and various oligonucleosome conformations. We show that: counterions, especially divalent cations, predominantly condense around the nucleosomal and linker DNA, unburied regions of histone tails, and exposed chromatin surfaces; ionic screening is sensitively influenced by local and global conformations, with a wide ranging net nucleosome core screening charge (56–100e); and screening charge correlations reveal conformational flexibility and interactions among chromatin subunits, especially between the histone tails and parental nucleosome cores. These results provide complementary and detailed views of ionic effects on chromatin structure for modest computational resources. The electrostatic model developed here is applicable to other coarse-grained macromolecular complexes.

Hin Hark Gan; Tamar Schlick

2010-01-01T23:59:59.000Z

170

METATHESIS OF PLUTONIUM CARRIER LANTHANUM FLUORIDE PRECIPITATE WITH AN ALKALI  

DOE Patents (OSTI)

A plutonium fluoride precipitate is converted to plutonium hydroxide by digesting the precipitate with an aqueous alkali metal hydroxide solution.

Duffield, R.B.

1960-04-01T23:59:59.000Z

171

Atomistic-to-Continuum Multiscale Modeling with Long-Range Electrostatic Interactions in Ionic Solids  

E-Print Network (OSTI)

We present a multiscale atomistic-to-continuum method for ionic crystals with defects. Defects often play a central role in ionic and electronic solids, not only to limit reliability, but more importantly to enable the functionalities that make these materials of critical importance. Examples include solid electrolytes that conduct current through the motion of charged point defects, and complex oxide ferroelectrics that display multifunctionality through the motion of domain wall defects. Therefore, it is important to understand the structure of defects and their response to electrical and mechanical fields. A central hurdle, however, is that interactions in ionic solids include both short-range atomic interactions as well as long-range electrostatic interactions. Existing atomistic-to-continuum multi-scale methods, such as the Quasicontinuum method, are applicable only when the atomic interactions are short-range. In addition, empirical reductions of quantum mechanics to density functional models are unable...

Marshall, Jason

2013-01-01T23:59:59.000Z

172

METHOD FOR REMOVING CONTAMINATION FROM PRECIPITATES  

DOE Patents (OSTI)

An improvement in the bismuth phosphate carrier precipitation process is presented for the recovery and purification of plutonium. When plutonium, in the tetravalent state, is carried on a bismuth phosphate precipitate, amounts of centain of the fission products are carried along with the plutonium. The improvement consists in washing such fission product contaminated preeipitates with an aqueous solution of ammonium hydrogen fluoride. since this solution has been found to be uniquely effective in washing fission production contamination from the bismuth phosphate precipitate.

Stahl, G.W.

1959-01-01T23:59:59.000Z

173

Uranium and Aluminosilicate Surface Precipitation Tests  

SciTech Connect

The 2H evaporator at the Savannah River Site has been used to treat an aluminum-rich waste stream from canyon operations and a silicon-rich waste stream from the Defense Waste Processing Facility. The formation of aluminosilicate scale in the evaporator has caused significant operational problems. Because uranium has been found to accumulate in the aluminosilicate solids, the scale deposition has introduced criticality concerns as well. The objective of the tests described in this report is to determine possible causes of the uranium incorporation in the evaporator scale materials. The scope of this task is to perform laboratory experiments with simulant solutions to determine if (1) uranium can be deposited on the surfaces of various sodium aluminosilicate (NAS) forms and (2) aluminosilicates can form on the surfaces of uranium-containing solids. Batch experiments with simulant solutions of three types were conducted: (1) contact of uranium solutions/sols with NAS coatings on stainless steel surfaces, (2) contact of uranium solutions with NAS particles, and (3) contact of precipitated uranium-containing particles with solutions containing aluminum and silicon. The results show that uranium can be incorporated in NAS solids through encapsulation in bulk agglomerated NAS particles of different phases (amorphous, zeolite A, sodalite, and cancrinite) as well as through heterogeneous deposition on the surfaces of NAS coatings (amorphous and cancrinite) grown on stainless steel. The results also indicate that NAS particles can grow on the surfaces of precipitated uranium solids. Particularly notable for evaporator operations is the finding that uranium solids can form on existing NAS scale, including cancrinite solids. If NAS scale is present, and uranium is in sufficient concentration in solution to precipitate, a portion of the uranium can be expected to become associated with the scale. The data obtained to date on uranium-NAS affinity are qualitative. A necessary next step is to quantitatively determine the amounts of uranium that may be incorporated into NAS scale solids under differing conditions e.g., varying silicon/aluminum ratio, uranium concentration, temperature, and deposition time.

Hu, M.Z.

2002-11-27T23:59:59.000Z

174

Investigation of Solution Combustion Synthesis and Precipitation ...  

Science Conference Proceedings (OSTI)

Presentation Title, Investigation of Solution Combustion Synthesis and Precipitation Synthesis Conditions on TiO2 and ZnO Nanopowder Characteristics

175

Carbon Nano Tubes (CNT) / Aragonite Precipitated Calcium ...  

Science Conference Proceedings (OSTI)

Presentation Title, Carbon Nano Tubes (CNT) / Aragonite Precipitated Calcium ... Porous Rare-Earth Containing NbTiAl-Based High-entropy Materials Used for ...

176

Method for Removing Precipitates in Biofuel  

ORNL 2010-G00619/jcn UT-B ID 200902314 Method for Removing Precipitates in Biofuel Technology Summary At ORNL the application of ultrasonic energy, or ...

177

Kinetics of Boehmite Precipitation from Supersaturated Sodium ...  

Science Conference Proceedings (OSTI)

This work presents the effects of mass ratio of ethanol and temperature on the precipitation rate and phase compositions of alumina hydrate. The ratio of AlOOH  ...

178

Creep resistant, precipitation-dispersion-strengthened ...  

An iron-based, corrosion-resistant, precipitation strengthened, martensitic steel essentially free of delta ferrite for use at high temperatures has a ...

179

Influence of GPS Precipitable Water Vapor Retrievals on Quantitative Precipitation Forecasting in Southern California  

Science Conference Proceedings (OSTI)

The effects of precipitable water vapor (PWV) retrievals from the Southern California Integrated GPS Network (SCIGN) on quantitative precipitation forecast (QPF) skill are examined over two flood-prone regions of Southern California: Santa ...

Steven Marcus; Jinwon Kim; Toshio Chin; David Danielson; Jayme Laber

2007-11-01T23:59:59.000Z

180

Comparison of precipitation derived from the ECMWF operational forecast model and satellite precipitation data sets.  

Science Conference Proceedings (OSTI)

Precipitation is an important component of the climate system and the accurate representation of the diurnal rainfall cycle is a key test of model performance. Although the modelling of precipitation in the cooler mid-latitudes has improved, in ...

Chris Kidd; Erin Dawkins; George Huffman

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


181

Performance of the Precipitation Occurrence Sensor System as a Precipitation Gauge  

Science Conference Proceedings (OSTI)

The Precipitation Occurrence Sensor System (POSS) is a small X-band Doppler radar originally developed by the Meteorological Service of Canada for reporting the occurrence, type, and intensity of precipitation from Automated Weather Observing ...

B. E. Sheppard; P. I. Joe

2008-02-01T23:59:59.000Z

182

Production of Temporally Consistent Gridded Precipitation and Temperature Fields for the Continental United States  

Science Conference Proceedings (OSTI)

The availability of long-term gridded datasets of precipitation, temperature, and other surface meteorological variables offers the potential for deriving a range of land surface conditions that have not been directly observed. These include, for ...

Alan F. Hamlet; Dennis P. Lettenmaier

2005-06-01T23:59:59.000Z

183

Evolving Multisensor Precipitation Estimation Methods: Their Impacts on Flow Prediction Using a Distributed Hydrologic Model  

Science Conference Proceedings (OSTI)

This study investigates evolving methodologies for radar and merged gauge–radar quantitative precipitation estimation (QPE) to determine their influence on the flow predictions of a distributed hydrologic model. These methods include the National ...

David Kitzmiller; Suzanne Van Cooten; Feng Ding; Kenneth Howard; Carrie Langston; Jian Zhang; Heather Moser; Yu Zhang; Jonathan J. Gourley; Dongsoo Kim; David Riley

2011-12-01T23:59:59.000Z

184

Developing an Online Information System Prototype for Global Satellite Precipitation Algorithm Validation and Intercomparison  

Science Conference Proceedings (OSTI)

Over the decades, significant progress has been made in satellite precipitation product development. In particular, temporal resolution and timely availability have been improved by blended techniques. The resulting products, including near-real-...

Zhong Liu; Hualan Rui; William Teng; Long Chiu; Gregory Leptoukh; Steven Kempler

2009-12-01T23:59:59.000Z

185

Role of Antecedent Land Surface Conditions in Warm Season Precipitation over Northwestern Mexico  

Science Conference Proceedings (OSTI)

The role of antecedent land surface conditions including precipitation (P), surface skin temperature (Ts), soil moisture (Sm), and snow water equivalent (SWE) anomalies on the onset and intensity of the monsoon during the 1950–99 period in the ...

Chunmei Zhu; Tereza Cavazos; Dennis P. Lettenmaier

2007-05-01T23:59:59.000Z

186

Velocity shear-induced effects on electrostatic ion perturbations  

Science Conference Proceedings (OSTI)

Linear evolution of electrostatic perturbations in an unmagnetized electron{endash}ion plasma shear flow is studied. New physical effects, arising due to the non-normality of linear dynamics are disclosed. A new class of {ital nonperiodic collective mode} with vortical motion of ions, characterized by intense energy exchange with the mean flow, is found. It is also shown that the velocity shear induces extraction of the mean flow energy by ion-sound waves and that during the shear-induced evolution the ion-sound waves turn eventually into ion plasma oscillations. {copyright} {ital 1997 American Institute of Physics.}

Rogava, A.D. [Department of Physics, Tbilisi State University, and Department of Theoretical Astrophysics, Abastumani Astrophysical Observatory, Tbilisi, Republic of (Georgia)] [Department of Physics, Tbilisi State University, and Department of Theoretical Astrophysics, Abastumani Astrophysical Observatory, Tbilisi, Republic of (Georgia); Chagelishvili, G.D. [Department of Theoretical Astrophysics, Abastumani Astrophysical Observatory, Tbilisi, Republic of (Georgia)] [Department of Theoretical Astrophysics, Abastumani Astrophysical Observatory, Tbilisi, Republic of (Georgia); [Department of Cosmogeophysics, Space Research Institute, Moscow (Russia); Berezhiani, V.I. [Department of Plasma Physics, Institute of Physics, Tbilisi, Republic of (Georgia)] [Department of Plasma Physics, Institute of Physics, Tbilisi, Republic of (Georgia)

1997-12-01T23:59:59.000Z

187

Aluminosilicate Precipitation Impact on Uranium  

SciTech Connect

Experiments have been conducted to examine the fate of uranium during the formation of sodium aluminosilicate (NAS) when wastes containing high aluminate concentrations are mixed with wastes of high silicate concentration. Testing was conducted at varying degrees of uranium saturation. Testing examined typical tank conditions, e.g., stagnant, slightly elevated temperature (50 C). The results showed that under sub-saturated conditions uranium is not removed from solution to any large extent in both simulant testing and actual tank waste testing. This aspect was not thoroughly understood prior to this work and was necessary to avoid criticality issues when actual tank wastes were aggregated. There are data supporting a small removal due to sorption of uranium on sites in the NAS. Above the solubility limit the data are clear that a reduction in uranium concentration occurs concomitant with the formation of aluminosilicate. This uranium precipitation is fairly rapid and ceases when uranium reaches its solubility limit. At the solubility limit, it appears that uranium is not affected, but further testing might be warranted.

WILMARTH, WILLIAM

2006-03-10T23:59:59.000Z

188

Very compact, high-stability electrostatic actuator featuring contact-free self-limiting displacement  

DOE Patents (OSTI)

A compact electrostatic actuator is disclosed for microelectromechanical (MEM) applications. The actuator utilizes stationary and moveable electrodes, with the stationary electrodes being formed on a substrate and the moveable electrodes being supported above the substrate on a frame. The frame provides a rigid structure which allows the electrostatic actuator to be operated at high voltages (up to 190 Volts) to provide a relatively large actuation force compared to conventional electrostatic comb actuators which are much larger in size. For operation at its maximum displacement, the electrostatic actuator is relatively insensitive to the exact value of the applied voltage and provides a self-limiting displacement.

Rodgers, M. Steven (Albuquerque, NM); Miller, Samuel L. (Albuquerque, NM)

2003-01-01T23:59:59.000Z

189

A Novel Method for Fundamental Interaction Studies with Electrostatic Ion Beam Trap  

E-Print Network (OSTI)

Trapped radioactive atoms present exciting opportunities for the study of fundamental interactions and symmetries. For example, detecting beta decay in a trap can probe the minute experimental signal that originates from possible tensor or scalar terms in the weak interaction. Such scalar or tensor terms affect, e.g., the angular correlation between a neutrino and an electron in the beta-decay process, thus probing new physics of "beyond-the-standard-model" nature. In particular, this article focuses on a novel use of an innovative ion trapping device, the Electrostatic Ion Beam Trap (EIBT). Such a trap has not been previously considered for Fundamental Interaction studies and exhibits potentially very significant advantages over other schemes. These advantages include improved injection efficiency of the radionuclide under study, an extended field-free region, ion-beam kinematics for better efficiency and ease-of-operation and the potential for a much larger solid angle for the electron and recoiling atom counters.

S. Vaintraub; M. Hass; O. Aviv; O. Heber; I. Mardor

2010-05-22T23:59:59.000Z

190

Head-on collisions of electrostatic solitons in multi-ion plasmas  

SciTech Connect

Head-on collisions between two electrostatic solitons are dealt with by the Poincare-Lighthill-Kuo method of strained coordinates, for a plasma composed of a number of cold (positive and negative) ion species and Boltzmann electrons. The nonlinear evolution equations for both solitons and their phase shift due to the collision, resulting in time delays, are established. A Korteweg-de Vries description is the generic conclusion, except when the plasma composition is special enough to replace the quadratic by a cubic nonlinearity in the evolution equations, with concomitant repercussions on the phase shifts. Applications include different two-ion plasmas, showing positive or negative polarity solitons in the generic case. At critical composition, a combination of a positive and a negative polarity soliton is possible.

Verheest, Frank [Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281, B-9000 Gent (Belgium); School of Chemistry and Physics, University of KwaZulu-Natal, Durban 4000 (South Africa); Hellberg, Manfred A. [School of Chemistry and Physics, University of KwaZulu-Natal, Durban 4000 (South Africa); Hereman, Willy A. [Department of Applied Mathematics and Statistics, Colorado School of Mines, Golden, Colorado 80401-1887 (United States)

2012-09-15T23:59:59.000Z

191

Effective electrostatic interactions in mixtures of charged colloids  

E-Print Network (OSTI)

We present a theory of effective electrostatic interactions in polydisperse suspensions of charged macroions, generalizing to mixtures a theory previously developed for monodisperse suspensions. Combining linear response theory with a random phase approximation for microion correlations, we coarse-grain the microion degrees of freedom to derive general expressions for effective macroion-macroion pair potentials and a one-body volume energy. For model mixtures of charged hard-sphere colloids, we give explicit analytical expressions. The resulting effective pair potentials have the same general form as predicted by linearized Poisson-Boltzmann theory, but consistently incorporate dependence on macroion density and excluded volume via the Debye screening constant. The volume energy, which depends on the average macroion density, contributes to the free energy and so can influence thermodynamic properties of deionized suspensions. To validate the theory, we compute radial distribution functions of binary mixtures of oppositely charged colloidal macroions from molecular dynamics simulations of the coarse-grained model (with implicit microions), taking effective pair potentials as input. Our results agree closely with corresponding results from more computationally intensive Monte Carlo simulations of the primitive model (with explicit microions). Simulations of a mixture with large size and charge asymmetries indicate that charged nanoparticles can enhance electrostatic screening of charged colloids. The theory presented here lays a foundation for future large-scale modeling of complex mixtures of charged colloids, nanoparticles, and polyelectrolytes.

Jun Kyung Chung; Alan R. Denton

2013-08-16T23:59:59.000Z

192

Conductivity factor in the electrostatic coalescence of crude oil emulsions  

E-Print Network (OSTI)

Resolution of emulsions through electrostatic coalescence has been in practice for over fifty years. Through dimensional analysis of a charged droplet under an external field, the electrical conductivity was determined to be an influencing parameter on the rate of coalescence. Using previously established procedures, the potential for enhancement of the electrostatic coalescence rate for oil/water emulsions of highly refined oils and different grades of crude oils was explored using a 2-L vertically-oriented, cylindrical coalescer. The electrical conductivity of each phase of the water-in-oil emulsion was varied to determine their effects on the rate of coalescence. Both light and intermediate grades of crude oil emulsions were modified using conductivity modifiers, formerly used as antistatic addiitvties , to change the conductivity of the oil phase. Addition of the active component of the conductivity modifier in the ppm range increased the coalescence rate from 200% to 500% as compared to the base case (no additive). The refined oil emulsion was varied using water in different conductivity ranges. As anticipated, the rate of coalescence increased with water conductivity of the water. This is at least partially due to the unstable nature of these emulsions.

Nelson, James B

1998-01-01T23:59:59.000Z

193

Spectroscopic ellipsometry of electrochemical precipitation and oxidation  

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

Spectroscopic ellipsometry of electrochemical precipitation and oxidation Spectroscopic ellipsometry of electrochemical precipitation and oxidation of nickel hydroxide films Title Spectroscopic ellipsometry of electrochemical precipitation and oxidation of nickel hydroxide films Publication Type Journal Article Year of Publication 1998 Authors Kong, Fanping, Robert Kostecki, Frank R. McLarnon, and Rolf H. Muller Journal Thin Solid Films Volume 313-314 Pagination 775-780 Keywords effective medium approximation, electrochemical precipitation, inhomogeneous films, nickel hydroxide, spectroscopic ellipsometry Abstract In situ spectroscopic ellipsometry was used to investigate the electrochemical precipitation of nickel hydroxide films. By use of optical models for inhomogeneous films it was found that a specific precipitation current density produced the most compact and homogeneous film structures. The density of nickel hydroxide films was derived to be 1.25-1.50 g/cm3. The redox behavior of precipitated nickel hydroxide films was studied with an effective-medium optical model. Incomplete conversion to nickel oxyhydroxide and a reduction in film thickness were found during the oxidation cycle.

194

Skill, Correction, and Downscaling of GCM-Simulated Precipitation  

Science Conference Proceedings (OSTI)

The ability of general circulation models (GCMs) to correctly simulate precipitation is usually assessed by comparing simulated mean precipitation with observed climatologies. However, to what extent the skill in simulating average precipitation ...

Jonathan M. Eden; Martin Widmann; David Grawe; Sebastian Rast

2012-06-01T23:59:59.000Z

195

The Diurnal Variation of Precipitation in California and Nevada  

Science Conference Proceedings (OSTI)

The diurnal variation of precipitation across California and Nevada has been studied by means of a harmonic analysis of 35 years of hourly precipitation data for 347 stations, and a regional probability of precipitation analysis for grouped ...

Michael G. Landin; Lance F. Bosart

1989-08-01T23:59:59.000Z

196

A Bias-Corrected Precipitation Climatology for China  

Science Conference Proceedings (OSTI)

This paper presents the results of bias corrections of Chinese standard precipitation gauge (CSPG) measurements for wind-induced undercatch, a trace amount of precipitation, and wetting loss. Long-term daily data of precipitation, temperature, ...

Baisheng Ye; Daqing Yang; Yongjian Ding; Tianding Han; Toshio Koike

2004-12-01T23:59:59.000Z

197

The Effects of Precipitation on Cloud Droplet Measurement Devices  

Science Conference Proceedings (OSTI)

Aircraft in situ observations of precipitation during the Rain in Cumulus over the Ocean (RICO) field project are used to study and parameterize the effects of precipitation on cloud probes. Specifically, the effects of precipitation on the ...

Brad Baker; Qixu Mo; R. Paul Lawson; Darren O’Connor; Alexei Korolev

2009-07-01T23:59:59.000Z

198

Evaluation of Precipitation Products for Global Hydrological Prediction  

Science Conference Proceedings (OSTI)

Accurate precipitation data are critical for hydrologic prediction, yet outside the developed world in situ networks are so sparse as to make alternative methods of precipitation estimation essential. Several such alternative precipitation ...

Nathalie Voisin; Andrew W. Wood; Dennis P. Lettenmaier

2008-06-01T23:59:59.000Z

199

In-Drift Precipitates/Salts Analysis  

SciTech Connect

As directed by a written development plan (CRWMS M&O 1999a), an analysis of the effects of salts and precipitates on the repository chemical environment is to be developed and documented in an Analyses/Model Report (AMR). The purpose of this analysis is to assist Performance Assessment Operations (PAO) and the Engineered Barrier Performance Department in modeling the geochemical environment within a repository drift, thus allowing PAO to provide a more detailed and complete in-drift geochemical model abstraction and to answer the key technical issues (KTI) raised in the NRC Issue Resolution Status Report (IRSR) for the Evolution of the Near Field Environment (NFE) Revision 2 (NRC 1999). The purpose of this ICN is to qualify and document qualification of the AMR's technical products. The scope of this document is to develop a model of the processes that govern salt precipitation and dissolution and resulting water composition in the Engineered Barrier System (EBS). This model is developed to serve as a basis for the in-drift geochemical modeling work performed by PAO and is to be used in subsequent PAO analyses including the EBS physical and chemical model abstraction effort. However, the concepts may also apply to some near and far field geochemical processes and can have conceptual application within the unsaturated zone and saturated zone transport modeling efforts. The intended use of the model developed in this report is to estimate, within an appropriate level of confidence, the pH, chloride concentration, and ionic strength of water on the drip shield or other location within the drift during the post-closure period. These estimates are based on evaporative processes that are subject to a broad range of potential environmental conditions and are independent of the presence or absence of backfill. An additional intended use is to estimate the environmental conditions required for complete vaporization of water. The presence and composition of liquid water in the drift (i.e., pH, chloride concentration, and ionic strength) are potentially important to corrosion and radionuclide transport calculations performed by PAO.

P. Mariner

2001-01-10T23:59:59.000Z

200

Appendix F Cultural Resources, Including  

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

Appendix F Appendix F Cultural Resources, Including Section 106 Consultation STATE OF CALIFORNIA - THE RESOURCES AGENCY EDMUND G. BROWN, JR., Governor OFFICE OF HISTORIC PRESERVATION DEPARTMENT OF PARKS AND RECREATION 1725 23 rd Street, Suite 100 SACRAMENTO, CA 95816-7100 (916) 445-7000 Fax: (916) 445-7053 calshpo@parks.ca.gov www.ohp.parks.ca.gov June 14, 2011 Reply in Reference To: DOE110407A Angela Colamaria Loan Programs Office Environmental Compliance Division Department of Energy 1000 Independence Ave SW, LP-10 Washington, DC 20585 Re: Topaz Solar Farm, San Luis Obispo County, California Dear Ms. Colamaria: Thank you for seeking my consultation regarding the above noted undertaking. Pursuant to 36 CFR Part 800 (as amended 8-05-04) regulations implementing Section

Note: This page contains sample records for the topic "include electrostatic precipitators" 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

Electrostatic models for zeros of polynomials: Old, new, and some open problems  

Science Conference Proceedings (OSTI)

We give a survey concerning both very classical and recent results on the electrostatic interpretation of the zeros of some well-known families of polynomials, and the interplay between these models and the asymptotic distribution of their zeros when ... Keywords: 33C45, 42C05, 82B23, Asymptotics, Electrostatic model, Logarithmic potential, Orthogonal polynomials, Primary, Second order differential equation, Zeros, secondary

F. Marcellán; A. Martínez-Finkelshtein; P. Martínez-González

2007-10-01T23:59:59.000Z

202

Particle acceleration by electrostatic waves traveling perpendicular to nonuniform magnetic fields  

SciTech Connect

A novel method has been proposed for indefinite nonstochastic acceleration of particles by electrostatic waves propagating normal to a magnetic field. Use is made of a magnetic field inhomogeneity to prevent the particle from detrapping from the electrostatic wave. Numerical plots of particle trajectories are presented.

Rath, S.; Kaw, P.K.

1988-05-01T23:59:59.000Z

203

Low frequency electrostatic and electromagnetic modes in nonuniform cold quantum plasmas  

SciTech Connect

The low frequency electrostatic and electromagnetic linear modes in a nonuniform cold quantum electron-ion plasma are studied. The effect of stationary dust on an electrostatic mode is also investigated. The quantum corrections in the linear dispersion relations of a cold dense plasma are presented with possible applications.

Saleem, H.; Ahmad, Ali [Theoretical Plasma Physics Division, Pakistan Institute of Nuclear Science and Technology (PINSTECH), Islamabad (Pakistan); Department of Physics, COMSATS Institute of Information Technology (CIIT), Islamabad (Pakistan); Khan, S. A. [Department of Physics, COMSATS Institute of Information Technology (CIIT), Islamabad (Pakistan); Department of Physics, Government College Bagh AJK (Pakistan)

2008-01-15T23:59:59.000Z

204

Statistical Relationships between Topography and Precipitation Patterns  

Science Conference Proceedings (OSTI)

Statistical relationships between topography and the spatial distribution of mean annual precipitation are developed for ten distinct mountainous regions. These relationships are derived through linear bivariate and multivariate analyses, using ...

Alan Basist; Gerald D. Bell; Vernon Meentemeyer

1994-09-01T23:59:59.000Z

205

The Environment of Precipitating Shallow Cumulus Convection  

Science Conference Proceedings (OSTI)

Quantitative estimates of precipitation in a typical undisturbed trade wind region are derived from 2 months of radar reflectivity data and compared to the meteorological environment determined from soundings, surface flux, and airborne-lidar ...

Louise Nuijens; Bjorn Stevens; A. Pier Siebesma

2009-07-01T23:59:59.000Z

206

Specification of United States Summer Season Precipitation  

Science Conference Proceedings (OSTI)

The specification of summer season precipitation in the contiguous United States from summer season fields of 700 mb height, sea level pressure (SLP) and Pacific sea surface temperature (SST) was carried out using stepwise multiple linear ...

John R. Lanzante; Robert P. Harnack

1982-12-01T23:59:59.000Z

207

Causes of Robust Seasonal Land Precipitation Changes  

Science Conference Proceedings (OSTI)

Historical simulations from the Coupled Model Intercomparison Project phase 5 (CMIP5) archive are used to calculate the zonal mean change in seasonal land precipitation for the second half of the twentieth century in response to a range of ...

Debbie Polson; Gabriele C. Hegerl; Xuebin Zhang; Timothy J. Osborn

208

Quantifying Precipitation Suppression Due to Air Pollution  

Science Conference Proceedings (OSTI)

Urban air pollution and industrial air pollution have been shown qualitatively to suppress rain and snow. Here, precipitation losses over topographical barriers downwind of major coastal urban areas in California and in the land of Israel that ...

Amir Givati; Daniel Rosenfeld

2004-07-01T23:59:59.000Z

209

Interannual Variations of Tropical Precipitation Patterns  

Science Conference Proceedings (OSTI)

Seasonal and annual precipitation anomalies, normalized with respect to the standard deviations, are computed for stations between 30°S and 30°N. It is established that the annual anomalies are normally distributed. Spatially averaged anomalies ...

Till Stoeckenius

1981-06-01T23:59:59.000Z

210

Precipitation from Space: Advancing Earth System Science  

Science Conference Proceedings (OSTI)

Advances to space-based observing systems and data processing techniques have made precipitation datasets quickly and easily available via various data portals and widely used in Earth sciences. The increasingly lengthy time span of space-based ...

Paul A. Kucera; Elizabeth E. Ebert; F. Joseph Turk; Vincenzo Levizzani; Dalia Kirschbaum; Francisco J. Tapiador; Alexander Loew; M. Borsche

2013-03-01T23:59:59.000Z

211

Wakasa Bay: An AMSR Precipitation Validation Campaign  

Science Conference Proceedings (OSTI)

The “Wakasa Bay Experiment” was conducted in order to refine error models for oceanic precipitation from the Advanced Microwave Sounding Radiometer-Earth Observing System (AMSR-E) measurements and to develop algorithms for snowfall. The NASA P-3 ...

Elena S. Lobl; Kazumasa Aonashi; Masataka Murakami; Brian Griffith; Christian Kummerow; Guosheng Liu; Thomas Wilheit

2007-04-01T23:59:59.000Z

212

Radar Backscattering by Inhomogeneous Precipitation Particles  

Science Conference Proceedings (OSTI)

Calculations of radar backscattering by inhomogeneous precipitation particles require values of the dielectric function of two-component mixtures. Four such dielectric functions are critically examined and their relative merits are weighed. ...

Craig F. Bohren; Louis J. Battan

1980-08-01T23:59:59.000Z

213

Initial Precipitation Formation in Warm Florida Cumulus  

Science Conference Proceedings (OSTI)

The microphysical processes that lead to the development of precipitation in small, warm cumulus are examined using data from the Small Cumulus Microphysics Study near Cape Canaveral, Florida. Aircraft measurements are used to determine the ...

Neil F. Laird; Harry T. Ochs III; Robert M. Rauber; L. Jay Miller

2000-11-01T23:59:59.000Z

214

Hypothesis Tests for Evaluating Numerical Precipitation Forecasts  

Science Conference Proceedings (OSTI)

When evaluating differences between competing precipitation forecasts, formal hypothesis testing is rarely performed. This may be due to the difficulty in applying common tests given the spatial correlation of and non-normality of errors. ...

Thomas M. Hamill

1999-04-01T23:59:59.000Z

215

Precipitation at Ocean Weather Station “P"  

Science Conference Proceedings (OSTI)

This paper examines the 27-yr record of precipitation measurements at Ocean Weather Station “P” (50°N, 145°W). The credibility of the rainfall observations is assessed, and the testing of certain extraordinary features of the fall and winter ...

M. A. Jenkins; W. C. Wong; K. Higuchi; J. L. Knox

1994-05-01T23:59:59.000Z

216

Determination of Precipitable Water from Solar Transmission  

Science Conference Proceedings (OSTI)

A method of determining precipitable water to within 10% from solar radiometer data has been developed. The method uses a modified Langley technique to obtain the water vapor optical depth, and a model developed at the University of Arizona is ...

K. J. Thome; B. M. Herman; J. A. Reagan

1992-02-01T23:59:59.000Z

217

Precipitation Growth Trajectories in a CCOPE Storm  

Science Conference Proceedings (OSTI)

The growth trajectories of precipitation particles that attain diameters from 0.5 to 2.0 cm are modeled within the wind field of a small, relatively steady-state, southeastern Montana thunderstorm. The trajectories are calculated backwards, from ...

Charles A. Knight; Kevin R. Knupp

1986-06-01T23:59:59.000Z

218

Estimates of Characteristic Times for Precipitation Scavenging  

Science Conference Proceedings (OSTI)

We address the problem of using climatological data to estimate residence times in the atmosphere of particles subjected to precipitation scavenging. Basic parameters are the scavenging coefficient ?, the rainfall intensity R and the length of ...

Henning Rodhe; Jan Grandell

1981-02-01T23:59:59.000Z

219

Predictability of Seasonal Precipitation Using Joint Probabilities  

Science Conference Proceedings (OSTI)

This paper tests whether seasonal mean precipitation is predictable using a new method that estimates and analyzes joint probabilities. The new estimation method is to partition the globe into boxes, pool all data within the box to estimate a ...

M. Tugrul Yilmaz; Timothy DelSole

2010-04-01T23:59:59.000Z

220

The Severe Thunderstorm Electrification and Precipitation Study  

Science Conference Proceedings (OSTI)

During May–July 2000, the Severe Thunderstorm Electrification and Precipitation Study (STEPS) occurred in the High Plains, near the Colorado–Kansas border. STEPS aimed to achieve a better understanding of the interactions between kinematics, ...

Timothy J. Lang; L. Jay Miller; Morris Weisman; Steven A. Rutledge; Llyle J. Barker III; V. N. Bringi; V. Chandrasekar; Andrew Detwiler; Nolan Doesken; John Helsdon; Charles Knight; Paul Krehbiel; Walter A. Lyons; Don Macgorman; Erik Rasmussen; William Rison; W. David Rust; Ronald J. Thomas

2004-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "include electrostatic precipitators" 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

Environmental Influence on Typhoon Bobbie's Precipitation Distribution  

Science Conference Proceedings (OSTI)

The distribution and intensity of tropical cyclone precipitation has been known to have a large influence on the intensification and maintenance of the system. Therefore, monitoring the tropical cyclone convective rainband cycle and the large-...

Edward B. Rodgers; Harold F. Pierce

1995-11-01T23:59:59.000Z

222

The Tropical Precipitation Response to Orbital Precession  

Science Conference Proceedings (OSTI)

Orbital precession changes the seasonal distribution of insolation at a given latitude but not the annual mean. Hence, the correlation of paleoclimate proxies of annual-mean precipitation with orbital precession implies a nonlinear rectification ...

Timothy M. Merlis; Tapio Schneider; Simona Bordoni; Ian Eisenman

2013-03-01T23:59:59.000Z

223

Calibration of Probabilistic Quantitative Precipitation Forecasts  

Science Conference Proceedings (OSTI)

From 1 August 1990 to 31 July 1995, the Weather Service Forecast Office in Pittsburgh prepared 6159 probabilistic quantitative precipitation forecasts. Forecasts were made twice a day for 24-h periods beginning at 0000 and 1200 UTC for two river ...

Roman Krzysztofowicz; Ashley A. Sigrest

1999-06-01T23:59:59.000Z

224

Probabilistic Quantitative Precipitation Forecasts for River Basins  

Science Conference Proceedings (OSTI)

A methodology has been formulated to aid a field forecaster in preparing probabilistic quantitative precipitation forecasts (QPFs) for river basins. The format of probabilistic QPF is designed to meet three requirements: (i) it is compatible with ...

Roman Krzysztofowicz; William J. Drzal; Theresa Rossi Drake; James C. Weyman; Louis A. Giordano

1993-12-01T23:59:59.000Z

225

A Bayesian Quantitative Precipitation Nowcast Scheme  

Science Conference Proceedings (OSTI)

Very short-period quantitative precipitation forecast (QPF) or nowcast schemes provide deterministic output that fails to convey explicit measures of the uncertainty in the forecast. Presented here is a forecast methodology based upon a Bayesian ...

Neil I. Fox; Christopher K. Wikle

2005-06-01T23:59:59.000Z

226

Improved Reconstruction of Global Precipitation since 1900  

Science Conference Proceedings (OSTI)

An improved land–ocean global monthly precipitation anomaly reconstruction is developed for the period beginning in 1900. Reconstructions use the available historical data and statistics developed from the modern satellite-sampled period to ...

Thomas M. Smith; Phillip A. Arkin; Li Ren; Samuel S. P. Shen

2012-10-01T23:59:59.000Z

227

Quantifying Southern Oscillation-Precipitation Relationships  

Science Conference Proceedings (OSTI)

A series of earlier studies has identified regions of the world in which precipitation appears to have a consistent relationship with the Southern Oscillation (SO). In this paper, the authors attempt to quantify this relationship based on shifts ...

Chester F. Ropelewski; Michael S. Halpert

1996-05-01T23:59:59.000Z

228

Countries Gasoline Prices Including Taxes  

Gasoline and Diesel Fuel Update (EIA)

Countries (U.S. dollars per gallon, including taxes) Countries (U.S. dollars per gallon, including taxes) Date Belgium France Germany Italy Netherlands UK US 01/13/14 7.83 7.76 7.90 8.91 8.76 8.11 3.68 01/06/14 8.00 7.78 7.94 8.92 8.74 8.09 3.69 12/30/13 NA NA NA NA NA NA 3.68 12/23/13 NA NA NA NA NA NA 3.63 12/16/13 7.86 7.79 8.05 9.00 8.78 8.08 3.61 12/9/13 7.95 7.81 8.14 8.99 8.80 8.12 3.63 12/2/13 7.91 7.68 8.07 8.85 8.68 8.08 3.64 11/25/13 7.69 7.61 8.07 8.77 8.63 7.97 3.65 11/18/13 7.99 7.54 8.00 8.70 8.57 7.92 3.57 11/11/13 7.63 7.44 7.79 8.63 8.46 7.85 3.55 11/4/13 7.70 7.51 7.98 8.70 8.59 7.86 3.61 10/28/13 8.02 7.74 8.08 8.96 8.79 8.04 3.64 10/21/13 7.91 7.71 8.11 8.94 8.80 8.05 3.70 10/14/13 7.88 7.62 8.05 8.87 8.74 7.97 3.69

229

Magnetic response to applied electrostatic field in external magnetic field  

E-Print Network (OSTI)

We show, within QED and other possible nonlinear theories, that a static charge localized in a finite domain of space becomes a magnetic dipole, if it is placed in an external (constant and homogeneous) magnetic field in the vacuum. The magnetic moment is quadratic in the charge, depends on its size and is parallel to the external field, provided the charge distribution is at least cylindrically symmetric. This magneto-electric effect is a nonlinear response of the magnetized vacuum to an applied electrostatic field. Referring to a simple example of a spherically-symmetric applied field, the nonlinearly induced current and its magnetic field are found explicitly throughout the space, the pattern of lines of force is depicted, both inside and outside the charge, which resembles that of a standard solenoid of classical magnetostatics.

T. C. Adorno; D. M. Gitman; A. E. Shabad

2013-11-16T23:59:59.000Z

230

Mechanisms of gas precipitation in plasma-exposed tungsten  

Science Conference Proceedings (OSTI)

Precipitation in subsurface bubbles is a key process that governs how hydrogen isotopes migrate through and become trapped within plasma-exposed tungsten. We describe a continuum-scale model of hydrogen diffusion in plasma-exposed materials that includes the effects of precipitation. The model can account for bubble expansion via dislocation loop punching, using an accurate equation of state to determine the internal pressure. This information is used to predict amount of hydrogen trapped by bubbles, as well as the conditions where the bubbles become saturated. In an effort to validate the underlying assumptions, we compare our results with published positron annihilation and thermal desorption spectroscopy data, as well as our own measurements using the tritium plasma experiment (TPE).

R. D. Kolasinski; D. F. Cowgill; D. C. Donovan; M. Shimada

2012-05-01T23:59:59.000Z

231

Optimization of Heat Recovery from the Precipitation Circuit  

Science Conference Proceedings (OSTI)

For this reason, plate heat exchangers are used both at inlet to Precipitation and in between precipitation stages at Vedanta Aluminium's Lanjigarh alumina ...

232

Precipitation in a lead calcium tin anode  

SciTech Connect

Samples from a hot rolled sheet of a tin and calcium bearing lead alloy were solution heat treated at 300 Degree-Sign C and cooled down to room temperature at different rates; these samples were left at room temperature to study natural precipitation of CaSn{sub 3} particles. The samples were aged for 45 days before analysing their microstructure, which was carried out in a scanning electron microscope using secondary and backscattered electron detectors. Selected X-ray spectra analyses were conducted to verify the nature of the precipitates. Images were taken at different magnifications in both modes of observation to locate the precipitates and record their position within the images and calculate the distance between them. Differential scanning calorimeter analyses were conducted on selected samples. It was found that the mechanical properties of the material correlate with the minimum average distance between precipitates, which is related to the average cooling rate from solution heat treatment. - Highlights: Black-Right-Pointing-Pointer The distance between precipitates in a lead alloy is recorded. Black-Right-Pointing-Pointer The relationship between the distance and the cooling rate is established. Black-Right-Pointing-Pointer It is found that the strengthening of the alloy depends on the distance between precipitates.

Perez-Gonzalez, Francisco A., E-mail: fco.aurelio@inbox.com [Facultad de Ingenieria Mecanica y Electrica, Universidad Autonoma de Nuevo Leon (Mexico); Centro de Innovacion, Investigacion y Desarrollo en Ingenieria y Tecnologia, Universidad Autonoma de Nuevo Leon (Mexico); Camurri, Carlos G., E-mail: ccamurri@udec.cl [Departamento de Ingenieria de Materiales, Universidad de Concepcion (Chile); Carrasco, Claudia A., E-mail: ccarrascoc@udec.cl [Departamento de Ingenieria de Materiales, Universidad de Concepcion (Chile); Colas, Rafael, E-mail: rafael.colas@uanl.edu.mx [Facultad de Ingenieria Mecanica y Electrica, Universidad Autonoma de Nuevo Leon (Mexico); Centro de Innovacion, Investigacion y Desarrollo en Ingenieria y Tecnologia, Universidad Autonoma de Nuevo Leon (Mexico)

2012-02-15T23:59:59.000Z

233

Cloud-to-ground lightning-precipitation relationships in the South Central United States  

E-Print Network (OSTI)

Despite the general coexistence of cloud-to-ground (CG) lightning and precipitation, there have been few studies on the nature of the relationship between these two phenomena. This study endeavors to explore this relationship, concentrating on three facets: the strength and variability of the linear correlation between the two parameters, and the possible benefits of including additional parameters to this relationship; the differences in several atmospheric and lightning parameters corresponding to differences in the precipitation-to-CG lightning ratio, and the search for an optimal radius for inclusion of CG lightning flashes when comparing them to point precipitation values. Six regions (each on the order of I' latitude by I' longitude) from the states of Nebraska, Kansas, Oklahoma, Texas, and Louisiana are examined. The parameters are examined on daily and/or monthly time scales. This study uses CG lightning data which were recorded by the National Lightning Detection Network (NLDN) during the months of April through October in the years 1989 to 1993. Precipitation data are included from all available first-order, second-order, and cooperative stations. Atmospheric parameters are computed from soundings in the region. A primary tool used in the analyses is the linear regression model for examining linear relations among CG lightning, precipitation, and other parameters. In addition, the t-test and Wilcoxon Rank Sum test are used to discern statistically significant differences in atmospheric and lightning parameters between groups of days categorized by the precipitation-to-CG lightning ratio. The results show that linear correlations between CG lightning and precipitation for a region are highly varied; there are generally higher correlations in regions further away from the Gulf of Mexico. The only parameter which is a significantly beneficial addition to the model which included CG lightning and precipitation is a measure of the amount of positive CG flashes. When days are categorized by a precipitation-to-CG lightning ratio, the percent positive shows the most dramatic differences, with values on "high precipitation-to-lightning" days from roughly five to twelve times the value on "low precipitation-to-lightning" days. Several other parameters show statistically significant differences as well. Lastly, tests on several different radii suggest that there is no consistent optimal radius for CG lightning-precipitation comparisons.

Sheridan, Scott Christopher

1995-01-01T23:59:59.000Z

234

Homogeneous Precipitation of Nickel Hydroxide Powders  

SciTech Connect

Precipitation and characterization of nickel hydroxide powders were investigated. A comprehensive precipitation model incorporating the metal ion hydrolysis, complexation and precipitation reactions was developed for the production of the powders with urea precipitation method. Model predictions on Ni{sup 2+} precipitation rate were confirmed with precipitation experiments carried out at 90 C. Experimental data and model predictions were in remarkable agreement. Uncertainty in the solubility product data of nickel hydroxides was found to be the large contributor to the error. There were demonstrable compositional variations across the particle cross-sections and the growth mechanism was determined to be the aggregation of primary crystallites. This implied that there is a change in the intercalate chemistry of the primary crystallites with digestion time. Predicted changes in the concentrations of simple and complex ions in the solution support the proposed mechanism. The comprehensive set of hydrolysis reactions used in the model described above allows the investigation of other systems provided that accurate reaction constants are available. the fact that transition metal ions like Ni{sup 2+} form strong complexes with ammonia presents a challenge in the full recovery of the Ni{sup 2+}. On the other hand, presence of Al{sup 3+} facilitates the complete precipitation of Ni{sup 2+} in about 3 hours of digestion. A challenge in their predictive modeling studies had been the fact that simultaneous incorporation of more than one metal ion necessitates a different approach than just using the equilibrium constants of hydrolysis, complexation and precipitation reactions. Another limitation of using equilibrium constants is that the nucleation stage of digestion, which is controlled mainly by kinetics, is not fully justified. A new program released by IBM Almaden Research Center (Chemical Kinetics Simulator{trademark}, Version 1.01) lets the user change the order of kinetic components of a reaction which was set to stoichiometric constant with which the species appear in the reaction in KINSIM by default. For instance, in the case of LDH precipitation, the new program allows to change the order of species in the reactions associated with Al{sup 3+} and let the Ni{sup 2+} reactions take over. This could be carried on iteratively until a good fit between the experimental data and the predictions were observed. However for such studies availability of accurate equilibrium constants (especially for the solubility products for the solid phase) is a prerequisite.

Bora Mavis

2003-12-12T23:59:59.000Z

235

General Considerations of the Electrostatic Boundary Conditions in Oxide Heterostructures  

SciTech Connect

When the size of materials is comparable to the characteristic length scale of their physical properties, novel functionalities can emerge. For semiconductors, this is exemplified by the 'superlattice' concept of Esaki and Tsu, where the width of the repeated stacking of different semiconductors is comparable to the 'size' of the electrons, resulting in novel confined states now routinely used in opto-electronics. For metals, a good example is magnetic/non-magnetic multilayer films that are thinner than the spin-scattering length, from which giant magnetoresistance (GMR) emerged, used in the read heads of hard disk drives. For transition metal oxides, a similar research program is currently underway, broadly motivated by the vast array of physical properties that they host. This long-standing notion has been recently invigorated by the development of atomic-scale growth and probe techniques, which enables the study of complex oxide heterostructures approaching the precision idealized in Fig. 1(a). Taking the subset of oxides derived from the perovskite crystal structure, the close lattice match across many transition metal oxides presents the opportunity, in principle, to develop a 'universal' heteroepitaxial materials system. Hand-in-hand with the continual improvements in materials control, an increasingly relevant challenge is to understand the consequences of the electrostatic boundary conditions which arise in these structures. The essence of this issue can be seen in Fig. 1(b), where the charge sequence of the sublayer 'stacks' for various representative perovskites is shown in the ionic limit, in the (001) direction. To truly 'universally' incorporate different properties using different materials components, be it magnetism, ferroelectricity, superconductivity, etc., it is necessary to access and join different charge sequences, labelled here in analogy to the designations 'group IV, III-V, II-VI' for semiconductors. As we will review, interfaces between different families creates a host of electrostatic issues. They can be somewhat avoided if, as in many semiconductor heterostructures, only one family is used, with small perturbations (such as n-type or p-type doping) around them. However, for most transition metal oxides, this is greatly restrictive. For example, LaMnO{sub 3} and SrMnO{sub 3} are both insulators in part due to strong electron correlations, and only in their solid solution does 'colossal magnetoresistance' emerge in bulk. Similarly, the metallic superlattice shown in Fig. 1(c) can be considered a nanoscale deconstruction of (La,Sr)TiO{sub 3} to the insulating parent compounds. Therefore the aspiration to arbitrarily mix and match perovskite components requires a basic understanding of, and ultimately control over, these issues. In this context, here we present basic electrostatic features that arise in oxide heterostructures which vary the ionic charge stacking sequence. In close relation to the analysis of the stability of polar surfaces and semiconductor heterointerfaces, the variation of the dipole moment across a heterointerface plays a key role in determining its stability. Different self-consistent assignments of the unit cell are presented, allowing the polar discontinuity picture to be recast in terms of an equivalent local charge neutrality picture. The latter is helpful in providing a common framework with which to discuss electronic reconstructions, local-bonding considerations, crystalline defects, and lattice polarization on an equal footing, all of which are the subject of extensive current investigation.

Higuchi, Takuya

2011-08-19T23:59:59.000Z

236

Electrostatic ion waves in non-Maxwellian pair-ion plasmas  

SciTech Connect

The electrostatic ion waves are studied for non-Maxwellian or Lorentzian distributed unmagnetized pair-ion plasmas. The Vlasov equation is solved and damping rates are calculated for electrostatic waves in Lorentzian pair-ion plasmas. The damping rates of the electrostatic ion waves are studied for the equal and different ion temperatures of pair-ion species. It is found that the Landau damping rate of the ion plasma wave is increased in Lorentzian plasmas in comparison with Maxwellian pair-ion plasmas. The numerical results are also presented for illustration by taking into account the parameters reported in fullerene pair-ion plasma experiments.

Arshad, Kashif [Department of Physics, Quaid-i-Azam University, Islamabad 44000 (Pakistan); National Centre for Physics, Quaid-i-Azam University Campus, Shadhra Valley Road, Islamabad 44000 (Pakistan); Mahmood, S. [Theoretical Plasma Physics Division, PINSTECH, P.O. Nilore, Islamabad 44000 (Pakistan); National Centre for Physics, Quaid-i-Azam University Campus, Shadhra Valley Road, Islamabad 44000 (Pakistan)

2010-12-15T23:59:59.000Z

237

LLNL scientists find precipitation, global warming link  

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

4 4 For immediate release: 11/11/2013 | NR-13-11-04 Lawrence Livermore scientists have found that observed changes in global precipitation are directly affected by human activities. LLNL scientists find precipitation, global warming link Anne M Stark, LLNL, (925) 422-9799, stark8@llnl.gov LIVERMORE, Calif. -- The rain in Spain may lie mainly on the plain, but the location and intensity of that rain is changing not only in Spain but around the globe. A new study by Lawrence Livermore National Laboratory scientists shows that observed changes in global (ocean and land) precipitation are directly affected by human activities and cannot be explained by natural variability alone. The research appears in the Nov. 11 online edition of the Proceedings of the National Academy of Sciences.

238

Phase field and level set methods for modeling solute precipitation and/or dissolution  

Science Conference Proceedings (OSTI)

The dynamics of solid-liquid interfaces controlled by solute precipitation and/or dissolution due to the chemical reaction at the interface were computed in two dimensions using a phase field models. Sharp-interface asymptotic analysis demonstrated that the phase field solutions should converge to the proper sharp-interface precipitation/dissolution limit. For the purpose of comparison, the numerical solution of the sharp-interface model for solute precipitation/dissolution was directly solved using a level set method. In general, the phase field results are found in good agreement with the level set results for all reaction rates and geometry configurations investigated. Present study supports the applications of both methods to more complicated and realistic reactive systems, including the nuclear waste release and mineral precipitation and dissolution

Zhijie Xu; Hai Huang; Paul Meakin

2012-01-01T23:59:59.000Z

239

Analytical evaluation of the electrostatic potential for diatomic molecules  

Science Conference Proceedings (OSTI)

The technique of expanding Lowdin alpha-functions in a Taylor series has been further developed and applied to the problem of the electrostatic potential due to H{sub 2} with given 1s, 2s, 2p Slater-type orbitals. In contrast to other methods, the approach is completely analytic, and capable of arbitrary precision. The ultimate accuracy of our method is dependent upon the number of partial waves used; here by use of only 13 harmonics excellent results are achieved. The methods are readily generalized to larger molecules. The electron-molecule static interaction potentials is of central importance to calculations of cross sections for electron-molecule collisions. In this paper, using the diatomic hydrogen molecule of Fraga and Ransil, the authors introduce a fully analytic method and make a few comparisons with computer runs using the codes of Morrison and Schmid et al. They, as well as others, need numerical integrals for the potential. The authors analytical methods avoid cancellation errors and singularities by expanding the exponentials in the Lowdin alpha-functions, which are used to represent displaced orbitals in a spherical harmonic series.

Jones, H.W.; Etemadi, B.; Weatherford, C.A.

1988-01-01T23:59:59.000Z

240

Nonlinear Flow Generation By Electrostatic Turbulence In Tokamaks  

SciTech Connect

Global gyrokinetic simulations have revealed an important nonlinear flow generation process due to the residual stress produced by electrostatic turbulence of ion temperature gradient (ITG) modes and trapped electron modes (TEM). In collisionless TEM (CTEM) turbulence, nonlinear residual stress generation by both the fluctuation intensity and the intensity gradient in the presence of broken symmetry in the parallel wave number spectrum is identified for the first time. Concerning the origin of the symmetry breaking, turbulence self-generated low frequency zonal flow shear has been identified to be a key, universal mechanism in various turbulence regimes. Simulations reported here also indicate the existence of other mechanisms beyond E × B shear. The ITG turbulence driven “intrinsic” torque associated with residual stress is shown to increase close to linearly with the ion temperature gradient, in qualitative agreement with experimental observations in various devices. In CTEM dominated regimes, a net toroidal rotation is driven in the cocurrent direction by “intrinsic” torque, consistent with the experimental trend of observed intrinsic rotation. The finding of a “flow pinch” in CTEM turbulence may offer an interesting new insight into the underlying dynamics governing the radial penetration of modulated flows in perturbation experiments. Finally, simulations also reveal highly distinct phase space structures between CTEM and ITG turbulence driven momentum, energy and particle fluxes, elucidating the roles of resonant and non-resonant particles.

W.X. Wang, P.H. Diamond, T.S. Hahm, S. Ethier, G. Rewoldt, and W.M. Tang

2010-07-07T23:59:59.000Z

Note: This page contains sample records for the topic "include electrostatic precipitators" 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.


241

Nonlinear flow generation by electrostatic turbulence in tokamaks  

SciTech Connect

Global gyrokinetic simulations have revealed an important nonlinear flow generation process due to the residual stress produced by electrostatic turbulence of ion temperature gradient (ITG) modes and trapped electron modes (TEMs). In collisionless TEM (CTEM) turbulence, nonlinear residual stress generation by both the fluctuation intensity and the intensity gradient in the presence of broken symmetry in the parallel wavenumber spectrum is identified for the first time. Concerning the origin of the symmetry breaking, turbulence self-generated low frequency zonal flow shear has been identified to be a key, universal mechanism in various turbulence regimes. Simulations reported here also indicate the existence of other mechanisms beyond ExB shear. The ITG turbulence driven 'intrinsic' torque associated with residual stress is shown to increase close to linearly with the ion temperature gradient, in qualitative agreement with experimental observations in various devices. In CTEM dominated regimes, a net toroidal rotation is driven in the cocurrent direction by intrinsic torque, consistent with the experimental trend of observed intrinsic rotation. The finding of a 'flow pinch' in CTEM turbulence may offer an interesting new insight into the underlying dynamics governing the radial penetration of modulated flows in perturbation experiments. Finally, simulations also reveal highly distinct phase space structures between CTEM and ITG turbulence driven momentum, energy, and particle fluxes, elucidating the roles of resonant and non-resonant particles.

Wang, W. X.; Hahm, T. S.; Ethier, S.; Rewoldt, G.; Tang, W. M. [Plasma Physics Laboratory, Princeton University, P.O. Box 451, Princeton, New Jersey 08543 (United States); Diamond, P. H. [University of California, San Diego, La Jolla, California 92093 (United States)

2010-07-15T23:59:59.000Z

242

Electrostatic coalescence system with independent AC and DC hydrophilic electrodes  

DOE Patents (OSTI)

An improved electrostatic coalescence system is provided in which independent AC and DC hydrophilic electrodes are employed to provide more complete dehydration of an oil emulsion. The AC field is produced between an AC electrode array and the water-oil interface wherein the AC electrode array is positioned parallel to the interface which acts as a grounded electrode. The emulsion is introduced into the AC field in an evenly distributed manner at the interface. The AC field promotes drop-drop and drop-interface coalescence of the water phase in the entering emulsion. The continuous oil phase passes upward through the perforated AC electrode array and enters a strong DC field produced between closely spaced DC electrodes in which small dispersed droplets of water entrained in the continuous phase are removed primarily by collection at hydrophilic DC electrodes. Large droplets of water collected by the electrodes migrate downward through the AC electrode array to the interface. All phase separation mechanisms are utilized to accomplish more complete phase separation.

Hovarongkura, A. David (Arlington, VA); Henry, Jr., Joseph D. (Morgantown, WV)

1981-01-01T23:59:59.000Z

243

The Allen Telescope Array Search for Electrostatic Discharges on Mars  

E-Print Network (OSTI)

The Allen Telescope Array was used to monitor Mars between 9 March and 2 June 2010, over a total of approximately 30 hours, for radio emission indicative of electrostatic discharge. The search was motivated by the report from Ruf et al. (2009) of the detection of non-thermal microwave radiation from Mars characterized by peaks in the power spectrum of the kurtosis, or kurtstrum, at 10 Hz, coinciding with a large dust storm event on 8 June 2006. For these observations, we developed a wideband signal processor at the Center for Astronomy Signal Processing and Electronics Research (CASPER). This 1024-channel spectrometer calculates the accumulated power and power-squared, from which the spectral kurtosis is calculated post-observation. Variations in the kurtosis are indicative of non-Gaussianity in the signal, which can be used to detect variable cosmic signals as well as radio frequency interference (RFI). During the three month period of observations, dust activity occurred on Mars in the form of small-scale d...

Anderson, Marin M; Barott, William C; Bower, Geoffrey C; Delory, Gregory T; de Pater, Imke; Werthimer, Dan

2011-01-01T23:59:59.000Z

244

Method and apparatus for welding precipitation hardenable materials  

DOE Patents (OSTI)

A method for welding together members consisting of precipitation age hardened materials includes the steps of selecting a weld filler material that has substantially the same composition as the materials being joined, and an age hardening characteristic temperature age threshold below that of the aging kinetic temperature range of the materials being joined, whereby after welding the members together, the resulting weld and heat affected zone (HAZ) are heat treated at a temperature below that of the kinetic temperature range of the materials joined, for obtaining substantially the same mechanical characteristics for the weld and HAZ, as for the parent material of the members joined.

Murray, Jr., Holt (Hopewell, NJ); Harris, Ian D. (Dublin, OH); Ratka, John O. (Cleveland Heights, OH); Spiegelberg, William D. (Parma, OH)

1994-01-01T23:59:59.000Z

245

Method and apparatus for welding precipitation hardenable materials  

DOE Patents (OSTI)

A method for welding together members consisting of precipitation age hardened materials includes the steps of selecting a weld filler material that has substantially the same composition as the materials being joined, and an age hardening characteristic temperature age threshold below that of the aging kinetic temperature range of the materials being joined, whereby after welding the members together, the resulting weld and heat affected zone (HAZ) are heat treated at a temperature below that of the kinetic temperature range of the materials joined, for obtaining substantially the same mechanical characteristics for the weld and HAZ, as for the parent material of the members joined. 5 figures.

Murray, H. Jr.; Harris, I.D.; Ratka, J.O.; Spiegelberg, W.D.

1994-06-28T23:59:59.000Z

246

Generation of Electrostatic Waves via Parametric Instability and Heating of Solar Corona  

E-Print Network (OSTI)

In the upper layers of the solar atmosphere the temperature increases sharply. We studied possibility of the transfer of neutrals motion energy into the electrostatic waves.Electrostatic waves could damp in the upper layers of the solar atmosphere and their energy could be transformed into the thermal energy of the solar atmosphere plasma. When studying the plasma dynamics in the low altitudes of the solar atmosphere, we investigated hydrodynamics of the plasma which consists of thee components-electrons, ions and neutrals. In order to study evolution of disturbances of high amplitudes the parametric resonance technique is used. The dispersion relation for the electrostatic waves excited due tot he motion of neutrals is derived. The frequencies of electromagnetic waves which could be excited due to existence of the acoustic wave are found. The increment of excited electrostatic waves are determined. The motion of the neutrals in the lower solar atmosphere, where ionization rate is low, could excite electrosta...

Krasnoselskikh, George Machabeli Giorgi Dalakishvili Vladimir

2013-01-01T23:59:59.000Z

247

Electrostatic in Reissner-Nordstrom space-time with a conical defect  

E-Print Network (OSTI)

We calculate the electrostatic potential generated by a point charge in the space-time of Reissner-Nordstrom with a conical defect. An expression for the self-energy is also presented.

J. Spinelly; V. B. Bezerra

2000-12-19T23:59:59.000Z

248

A Nonhomogeneous Hidden Markov Model for Precipitation  

E-Print Network (OSTI)

patterns called weather states". The weather states are assumed to follow a Markov chain in which-level pressure. Precipitation is assumed to be conditionally temporally independent given the weather state. In developing hydrologic models re- searchers use information on temperature, solar radiation and other climatic

Washington at Seattle, University of

249

RECOVERY OF PLUTONIUM BY CARRIER PRECIPITATION  

DOE Patents (OSTI)

The recovery of plutonium from an aqueous nitric acid Zr-containing solution of 0.2 to 1N acidity is accomplished by adding fluoride anions (1.5 to 5 mg/l), and precipitating the Pu with an excess of H/sub 2/0/sub 2/ at 53 to 65 deg C. (AEC)

Goeckermann, R.H.

1961-04-01T23:59:59.000Z

250

A Method to Determine Precipitation Types  

Science Conference Proceedings (OSTI)

A method to diagnose surface precipitation types is suggested. Most cases of freezing rain and ice pellets occur with a layer warmer than 0°C extending above a surface-based layer of air colder than 0°C. The procedure uses predictors proportional ...

Pierre Bourgouin

2000-10-01T23:59:59.000Z

251

Soft computing techniques in ensemble precipitation nowcast  

Science Conference Proceedings (OSTI)

This study presented various soft computing techniques for forecasting the hourly precipitations during tropical cyclones. The purpose of the current study is to present a concise and synthesized documentation of the current level of skill of various ... Keywords: Forecast, Machine learning, Rainfall, Skill score

Chih-Chiang Wei

2013-02-01T23:59:59.000Z

252

Weekly Precipitation Cycles along the Northeast Corridor?  

Science Conference Proceedings (OSTI)

Twenty years of precipitation data from seven cities along or near the east coast of the United States from the northern mid-Atlantic region to northern New England have been analyzed to determine if there are any weekly cycles in either daily ...

Mark P. DeLisi; Alan M. Cope; Jason K. Franklin

2001-06-01T23:59:59.000Z

253

The Isotopic Composition of Cyclonic Precipitation  

Science Conference Proceedings (OSTI)

The deuterium/hydrogen ratios ?D of sequential samples of precipitation at Palisades, New York were measured during four separate storms during January 1978. The values ranged from a low of ?177‰ to a high of ?30‰. For each of the storms there ...

Stanley David Gedzelman; James R. Lawrence

1982-10-01T23:59:59.000Z

254

Causes of Robust Seasonal Land Precipitation Changes  

Science Conference Proceedings (OSTI)

Historical simulations from phase 5 of the Coupled Model Intercomparison Project (CMIP5) archive are used to calculate the zonal-mean change in seasonal land precipitation for the second half of the twentieth century in response to a range of ...

Debbie Polson; Gabriele C. Hegerl; Xuebin Zhang; Timothy J. Osborn

2013-09-01T23:59:59.000Z

255

Superconductor precursor mixtures made by precipitation method  

DOE Patents (OSTI)

Method and apparatus for preparing highly pure homogeneous precursor powder mixtures for metal oxide superconductive ceramics. The mixes are prepared by instantaneous precipitation from stoichiometric solutions of metal salts such as nitrates at controlled pH's within the 9 to 12 range, by addition of solutions of non-complexing pyrolyzable cations, such as alkyammonium and carbonate ions.

Bunker, Bruce C. (Albuquerque, NM); Lamppa, Diana L. (Albuquerque, NM); Voigt, James A. (Albuquerque, NM)

1989-01-01T23:59:59.000Z

256

Evolution of Lightning Activity and Storm Charge Relative to Dual-Doppler Analysis of a High-Precipitation Supercell Storm  

Science Conference Proceedings (OSTI)

A high-precipitation tornadic supercell storm was observed on 29–30 May 2004 during the Thunderstorm Electrification and Lightning Experiment. Observational systems included the Oklahoma Lightning Mapping Array, mobile balloon-borne soundings, and ...

Kristin M. Calhoun; Donald R. MacGorman; Conrad L. Ziegler; Michael I. Biggerstaff

2013-07-01T23:59:59.000Z

257

Sensitivity of 0–12-h Warm-Season Precipitation Forecasts over the Central United States to Model Initialization  

Science Conference Proceedings (OSTI)

Sensitivity of 0–12-h warm-season precipitation forecasts to atmospheric initial conditions, including those from different large-scale model analyses and from rapid cycled (RC) three-dimensional variational data assimilations (3DVAR) with and ...

Juanzhen Sun; Stanley B. Trier; Qingnong Xiao; Morris L. Weisman; Hongli Wang; Zhuming Ying; Mei Xu; Ying Zhang

2012-08-01T23:59:59.000Z

258

NOAA’s 1981–2010 U.S. Climate Normals: Monthly Precipitation, Snowfall, and Snow Depth  

Science Conference Proceedings (OSTI)

The 1981–2010 “U.S. Climate Normals” released by the National Oceanic and Atmospheric Administration’s (NOAA) National Climatic Data Center include a suite of monthly, seasonal, and annual statistics that are based on precipitation, snowfall, and ...

Imke Durre; Michael F. Squires; Russell S. Vose; Xungang Yin; Anthony Arguez; Scott Applequist

2013-11-01T23:59:59.000Z

259

Hemispherical Asymmetry of Tropical Precipitation in ECHAM5/MPI-OM during El Niño and under Global Warming  

Science Conference Proceedings (OSTI)

Similarities and differences between El Niño and global warming are examined in hemispherical and zonal tropical precipitation changes of the ECHAM5/Max Planck Institute Ocean Model (MPI-OM) simulations. Similarities include hemispherical ...

Chia Chou; Jien-Yi Tu

2008-03-01T23:59:59.000Z

260

NOAA’s 1981-2010 U.S. Climate Normals: Monthly Precipitation, Snowfall, and Snow Depth  

Science Conference Proceedings (OSTI)

The 1981-2010 United States Climate Normals released by the National Oceanic and Atmospheric Administration’s (NOAA’s) National Climatic Data Center (NCDC) include a suite of monthly, seasonal, and annual statistics based on precipitation, ...

Imke Durre; Michael F. Squires; Russell S. Vose; Xungang Yin; Anthony Arguez; Scott Applequist

Note: This page contains sample records for the topic "include electrostatic precipitators" 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

Investigation of Neptunium Precipitator Cleanout Options  

SciTech Connect

Oxalate precipitation followed by filtration is used to prepare plutonium oxalate. Historically, plutonium oxalate has tended to accumulate in the precipitation tanks. These solids are periodically removed by flushing with concentrated (64 percent) nitric acid. The same precipitation tanks will now be used in the processing of neptunium. Literature values indicate that neptunium oxalate may not be as soluble as plutonium oxalate in nitric acid. Although a wide variety of options is available to improve neptunium oxalate solubility for precipitator flushing, most of these options are not practical for use. Many of these options require the use of incompatible or difficult to handle chemicals. Other options would require expensive equipment modifications or are likely to lead to product contamination. Based on review of literature and experimental results, the two best options for flushing the precipitator are (1) 64 percent nitric acid and (2) addition of sodium permanganate follow ed by sodium nitrite. Nitric acid is the easiest option to implement. It is already used in the facility and will not lead to product contamination. Experimental results indicate that neptunium oxalate can be dissolved in concentrated nitric acid (64 percent) at 60 degree C to a concentration of 2.6 to 5.6 grams of Np/liter after at least three hours of heating. A lower concentration (1.1 grams of Np/liter) was measured at 60 degree C after less than two hours of heating. These concentrations are acceptable for flushing if precipitator holdup is low (approximately 100-250 grams), but a second method is required for effective flushing if precipitator holdup is high (approximately 2 kilograms). The most effective method for obtaining higher neptunium concentrations is the use of sodium permanganate followed by the addition of sodium nitrite. There is concern that residual manganese from these flushes could impact product purity. Gas generation during permanganate addition is also a concern. Experimental results indicate that a solubility of at least 40 grams of Np/liter can be obtained using permanganate at ambient temperature, although it is expected that even higher neptunium concentrations can be achieved.

Hill, B.C.

2003-09-08T23:59:59.000Z

262

in situ Calcite Precipitation for Contaminant Immobilization  

SciTech Connect

in situ Calcite Precipitation for Contaminant Immobilization Yoshiko Fujita (Yoshiko.fujita@inl.gov) (Idaho National Laboratory, Idaho Falls, Idaho, USA) Robert W. Smith (University of Idaho-Idaho Falls, Idaho Falls, Idaho, USA) Subsurface radionuclide and trace metal contaminants throughout the U.S. Department of Energy (DOE) complex pose one of DOE’s greatest challenges for long-term stewardship. One promising stabilization mechanism for divalent trace ions, such as the short-lived radionuclide strontium-90, is co-precipitation in calcite. Calcite, a common mineral in the arid western U.S., can form solid solutions with trace metals. The rate of trace metal incorporation is susceptible to manipulation using either abiotic or biotic means. We have previously demonstrated that increasing the calcite precipitation rate by stimulating the activity of urea hydrolyzing microorganisms can result in significantly enhanced Sr uptake. Urea hydrolysis causes the acceleration of calcium carbonate precipitation (and trace metal co-precipitation) by increasing pH and alkalinity, and also by liberating the reactive cations from the aquifer matrix via exchange reactions involving the ammonium ion derived from urea: H2NCONH2 + 3H2O ? 2NH4+ + HCO3- + OH- urea hydrolysis >X:2Ca + 2NH4+ ? 2>X:NH4 + Ca2+ ion exchange Ca2+ + HCO3- + OH- ? CaCO3(s) + H2O calcite precipitation where >X: is a cation exchange site on the aquifer matrix. This contaminant immobilization approach has several attractive features. Urea hydrolysis is catalyzed by the urease enzyme, which is produced by many indigenous subsurface microorganisms. Addition of foreign microbes is unnecessary. In turn the involvement of the native microbes and the consequent in situ generation of reactive components in the aqueous phase (e.g., carbonate and Ca or Sr) can allow dissemination of the reaction over a larger volume and/or farther away from an amendment injection point, as compared to direct addition of the reactants at a well (which can lead to clogging). A final particularly attractive characteristic of this approach is its long-term sustainability; the remediation scheme is geared toward environments that are already saturated with respect to calcite, and in such systems the bulk of any newly precipitated calcite will remain stable once engineered manipulations cease. This means that the co-precipitated contaminants will be effectively sequestered over the long term. We are currently conducting integrated field, laboratory, and computational research to evaluate a) the relationships between urea hydrolysis rate, calcite precipitation rate, and trace metal partitioning under environmentally relevant conditions; and b) the coupling between flow/flux manipulations and calcite precipitate distribution and metal uptake. We are also assessing the application of geophysical and molecular biological tools to monitor the relevant chemical and physical processes. The primary emphasis is on field-scale processes, with the laboratory and modeling activities designed specifically to support the field studies. Field experiments are being conducted in perched water (vadose zone) at the Vadose Zone Research Park (VZRP) at the Idaho National Laboratory; the VZRP provides an uncontaminated setting that is an analog of the 90Sr-contaminated vadose zone at the Idaho Nuclear Technology and Engineering Center. A summary of results to date will be presented.

Yoshiko Fujita; Robert W. Smith

2009-08-01T23:59:59.000Z

263

COMMENTS ON THE SEARCH FOR ELECTROSTATIC DISCHARGES ON MARS  

Science Conference Proceedings (OSTI)

Ruf et al. used the Deep Space Network (DSN) to search for the emission of non-thermal radiation by martian dust storms, theoretically predicted by Renno et al. They detected the emission of non-thermal radiation that they were searching for, but were surprised that it contained spectral peaks suggesting modulation at various frequencies and their harmonics. Ruf et al. hypothesized that the emission of non-thermal radiation was caused by electric discharges in a deep convective dust storm, modulated by Schumann resonances (SRs). Anderson et al. used the Allen Telescope Array (ATA) to search for similar emissions. They stated that they found only radio frequency interference (RFI) during their search for non-thermal emission by martian dust storms and implicitly suggested that the signal detected by Ruf et al. was also RFI. However, their search was not conducted during the dust storm season when deep convective storms are most likely to occur. Here, we show that the ubiquitous dust devils and small-scale dust storms that were instead likely present during their observations are too shallow to excite SRs and produce the signals detected by Ruf et al. We also show that the spectral and temporal behavior of the signals detected by Anderson et al. corroborates the idea that they originated from man-made pulse-modulated telecommunication signals rather than martian electric discharges. In contrast, an identical presentation of the signals detected by Ruf et al. demonstrates that they do not resemble man-made signals. The presentation indicates that the DSN signals were consistent with modulation by martian SRs, as originally hypothesized by Ruf et al. We propose that a more comprehensive search for electrostatic discharges be conducted with either the ATA or DSN during a future martian dust storm season to test the hypothesis proposed by Ruf et al.

Renno, Nilton O.; Ruf, Christopher S., E-mail: renno@alum.mit.edu [Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, MI (United States)

2012-12-20T23:59:59.000Z

264

Electrostatic granular bed filter development program. Final report  

SciTech Connect

The application of the electrostatically enhanced granular bed filter (EGB) in a pressurized fluidized bed (PFB) combined cycle power plant is explored in this study. In a PFB combustor power plant, dust particles entrained in the combustion gases must be removed at high temperature (1700/sup 0/F) and pressure (10 atm) in order to protect a gas turbine from erosion. The EFB filter provides a unique design adapted to avoid filter front face plugging which has been the limiting factor in the successful development of granular bed filters for this application. Under the present study, laboratory experiments and analyses were performed to provide the engineering data necessary to design a test module in the actual PFB environment. An analytical model for predicting the performance of an EGB was also developed. The test data and the model were then utilized to establish preferred geometries and operating parameters of the EGB filter system applied in a 663 MWe PFB power plant. Preliminary conceptual designs were established and an economic evaluations performed. The results of the system analysis and economic studies were analyzed to assess the applicability of the EGB filter to utility scale PFB power plants. New power plants must also meet New Source Performance Standards (.03 lb/10/sup 6/ Btu) which necessitates removal of dust in the respirable size range which would otherwise be harmless to the gas turbine. A key technical issue in the PFB application is whether the hot gas cleanup equipment can satisfy the NSPS. The potential of the EGB for achieving NSPS ahead of the gas turbine is demonstrated, and the conceptual design and economics of this application are presented. (LCL)

1981-11-01T23:59:59.000Z

265

Dendrite-Free Lithium Deposition via Self-Healing Electrostatic Shield Mechanism  

SciTech Connect

Lithium metal batteries are called the “holy grail” of energy storage systems. However, lithium dendrite growth in these batteries has prevented their practical applications in the last 40 years. Here we show a novel mechanism which can fundamentally change the dendritic morphology of lithium deposition. A low concentration of the second cations (including ions of cesium, rubidium, potassium, and strontium) exhibits an effective reduction potential lower than the standard reduction potential of lithium ions when the chemical activities of these second cations are much lower than that of lithium ions. During lithium deposition, these second cations will form a self-healing electrostatic shield around the initial tip of lithium whenever it is formed. This shield will repel the incoming lithium ions and force them to deposit in the smoother region of the anode so a dendrite-free film is obtained. This mechanism is effective on dendrite prevention in both lithium metal and lithium ion batteries. They may also prevent dendrite growth in other metal batteries and have transformational impact on the smooth deposition in general electrodeposition processes.

Ding, Fei; Xu, Wu; Graff, Gordon L.; Zhang, Jian; Sushko, Maria L.; Chen, Xilin; Shao, Yuyan; Engelhard, Mark H.; Nie, Zimin; Xiao, Jie; Liu, Xingjiang; Sushko, P. V.; Liu, Jun; Zhang, Jiguang

2013-02-28T23:59:59.000Z

266

Maintenance of a rural precipitation chemistry center at Whiteface Mountain  

SciTech Connect

For the Past 11 years, Whiteface Mountain (WFM) has been successfully collecting data according to the MAP3S (Multistate Power Production Pollution Study) protocols. These protocols include field sampling, laboratory procedures, sample handling and shipment, and supporting measurements at the summit or lodge including meteorological and air quality parameters. All blind tests and audits have been successfully passed. Since the beginning of the MAP3S program it was recognized that, because of its remoteness, WFM needed some additional support to process the samples and to obtain site specific supporting data. The primary purpose of this funding was to insure the technical support to maintain the availability of WFM so that the necessary high quality research monitoring could continue. In addition, during the past year, we were able to: (1) perform all operations required by the National Trends Network (NTN) precipitation monitoring network: (2) begin the comparison of MAP3S data with similar data taken at WFM; (3) begin a series of ion chromatography measurements on MAP3S duplicate samples (when sufficient volume was available) to study the effect of time delays between sample collection and chemical analysis: (4) provide wet deposition data to the EPA Mountain Cloud Chemistry Program (MCCP); (5) assess the precipitation data quality of the ENSR measurements collocated with MAP3S. Selected results are presents. 6 refs., 1 fig.

Mohnen, V.A.

1991-09-01T23:59:59.000Z

267

Statistical Relationships of the Tropical Rainfall Measurement Mission (TRMM) Precipitation and Large-scale Flow  

E-Print Network (OSTI)

The relationship between precipitation and large-flow is important to understand and characterize in the climate system. We examine statistical relationships between the Tropical Rainfall Measurement Mission (TRMM) 3B42 gridded precipitation and large-scale ow variables in the Tropics for 2000{2007. These variables include NCEP/NCAR Re-analysis sea surface temperatures (SSTs), vertical temperature pro files, omega, and moist static energy, as well as Atmospheric Infrared Sounder (AIRS) vertical temperatures and QuikSCAT surface divergence. We perform correlation analysis, empirical orthogonal function analysis, and logistic regression analysis on monthly, pentad, daily and near-instantaneous time scales. Logistic regression analysis is able to incorporate the non-linear nature of precipitation in the relation- ship. Flow variables are interpolated to the 0.25 degrees TRMM 3B42 grid and examined separately for each month to o set the effects of the seasonal cycle. January correlations of NCEP/NCAR Re-analysis SSTs and TRMM 3B42 precipitation have a coherent area of positive correlations in the Western and Central Tropical Pacific on all time scales. These areas correspond with the South Pacific Convergence Zone (SPCZ) and the Inter Tropical Convergence Zone (ITCZ). 500mb omega is negatively correlated with TRMM 3B42 precipitation across the Tropics on all time scales. QuikSCAT divergence correlations with precipitation have a band of weak and noisy correlations along the ITCZ on monthly time scales in January. Moist static energy, calculated from NCEP/NCAR Re-analysis has a large area of negative correlations with precipitation in the Central Tropical Pacific on all four time scales. The first few Empirical Orthogonal Functions (EOFs) of vertical temperature profiles in the Tropical Pacific have similar structure on monthly, pentad, and daily timescales. Logistic regression fit coefficients are large for SST and precipitation in four regions located across the Tropical Pacific. These areas show clear thresholded behavior. Logistic regression results for other variables and precipitation are less clear. The results from SST and precipitation logistic regression analysis indicate the potential usefulness of logistic regression as a non-linear statistic relating precipitation and certain ow variables.

Borg, Kyle

2010-05-01T23:59:59.000Z

268

Determination of Rainfall with the ESOC Precipitation Index  

Science Conference Proceedings (OSTI)

A validation of the ESOC (European Space 0Perations Centre) Precipitation Index (EPI) is carried out by comparing satellite data with observed rainfall in five African countries to determine the ability of estimating accumulated precipitation ...

Olli M. Turpeinen; Azzouz Abidi; Wahid Belhouane

1987-11-01T23:59:59.000Z

269

Understanding Prediction Skill of Seasonal Mean Precipitation over the Tropics  

Science Conference Proceedings (OSTI)

The connection between the local SST and precipitation (SST–P) correlation and the prediction skill of precipitation on a seasonal time scale is investigated based on seasonal hindcasts from the National Centers for Environmental Prediction (NCEP) ...

Arun Kumar; Mingyue Chen; Wanqiu Wang

2013-08-01T23:59:59.000Z

270

Tropical Convection and Precipitation Regimes in the Western United States  

Science Conference Proceedings (OSTI)

The authors have documented the relationship between tropical convection and precipitation regimes in the western United States. Circulation patterns associated with precipitation regimes are described and physical mechanisms are proposed. ...

Kingtse C. Mo; R. W. Higgins

1998-09-01T23:59:59.000Z

271

Modulation of Caribbean Precipitation by the Madden–Julian Oscillation  

Science Conference Proceedings (OSTI)

Based on 12 years of daily satellite precipitation data and reanalysis winds, intraseasonal (30–90 days) variability in Caribbean precipitation is linked to phases of the Madden–Julian oscillation (MJO). Intraseasonal variability is largest ...

Elinor R. Martin; Courtney Schumacher

2011-02-01T23:59:59.000Z

272

On the Conditional Distribution of Daily Precipitation Amounts  

Science Conference Proceedings (OSTI)

Possible conditional dependence of the distribution of daily precipitation amounts on the occurrence of precipitation on the preceding day is examined. Test results based on 25 years of data at 30 stations in the conterminous United States show ...

Edwin H. Chin; John F. Miller

1980-09-01T23:59:59.000Z

273

Regional Precipitation Trends: Distinguishing Natural Variability from Anthropogenic Forcing  

Science Conference Proceedings (OSTI)

In this study, the nature and causes for observed regional precipitation trends during 1977–2006 are diagnosed. It is found that major features of regional trends in annual precipitation during 1977–2006 are consistent with an atmospheric ...

Martin Hoerling; Jon Eischeid; Judith Perlwitz

2010-04-01T23:59:59.000Z

274

Observed Trends in Summertime Precipitation over the Southwestern United States  

Science Conference Proceedings (OSTI)

In this paper, the authors evaluate the significance of multidecadal trends in seasonal-mean summertime precipitation and precipitation characteristics over the southwestern United States using stochastic, chain-dependent daily rainfall models. ...

Bruce T. Anderson; Jingyun Wang; Guido Salvucci; Suchi Gopal; Shafiqul Islam

2010-04-01T23:59:59.000Z

275

Exploratory Analysis of Precipitation Events with Implications for Stochastic Modeling  

Science Conference Proceedings (OSTI)

The use of a concept called a precipitation “event” to obtain information regarding certain statistical properties of precipitation time series at a particular location and for a specific application (e.g., for modeling erosion) is described. ...

Barbara G. Brown; Richard W. Katz; Allan H. Murphy

1985-01-01T23:59:59.000Z

276

Central-West Argentina Summer Precipitation Variability and Atmospheric Teleconnections  

Science Conference Proceedings (OSTI)

The interannual-to-multidecadal variability of central-west Argentina (CWA) summer (October–March) precipitation and associated tropospheric circulation are studied in the period 1900–2010. Precipitation shows significant quasi cycles with periods ...

Eduardo A. Agosta; Rosa H. Compagnucci

2012-03-01T23:59:59.000Z

277

Evaluation of Passive Microwave Precipitation Algorithms in Wintertime Midlatitude Situations  

Science Conference Proceedings (OSTI)

The second intercomparison project of the Global Precipitation Climatology Project examined the estimation of midlatitude, cool-season precipitation. As part of that effort, the authors report here on the results of two microwave techniques the ...

Andrew J. Negri; Eric J. Nelkin; Robert F. Adler; George J. Huffman; Christian Kummerow

1995-02-01T23:59:59.000Z

278

Correction of Global Precipitation Products for Orographic Effects  

Science Conference Proceedings (OSTI)

Underestimation of precipitation in topographically complex regions plagues most gauge-based gridded precipitation datasets. Gauge locations are usually in or near population centers, which tend to lie at low elevations relative to the ...

Jennifer C. Adam; Elizabeth A. Clark; Dennis P. Lettenmaier; Eric F. Wood

2006-01-01T23:59:59.000Z

279

Orographic Precipitation and Water Vapor Fractionation over the Southern Andes  

Science Conference Proceedings (OSTI)

The climatological nature of orographic precipitation in the southern Andes between 40° and 48°S is investigated primarily using stable isotope data from streamwater. In addition, four precipitation events are examined using balloon soundings and ...

Ronald B. Smith; Jason P. Evans

2007-02-01T23:59:59.000Z

280

Canadian Precipitation Patterns Associated with the Southern Oscillation  

Science Conference Proceedings (OSTI)

Precipitation responses over Canada associated with the two extreme phases of the Southern Oscillation (SO), namely El Niño and La Niña, are identified. Using the best available precipitation data from 1911 to 1994, both the spatial and temporal ...

Amir Shabbar; Barrie Bonsal; Madhav Khandekar

1997-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "include electrostatic precipitators" 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

Adjusting Satellite Precipitation Data to Facilitate Hydrologic Modeling  

Science Conference Proceedings (OSTI)

Significant concern has been expressed regarding the ability of satellite-based precipitation products such as the National Aeronautics and Space Administration (NASA) Tropical Rainfall Measuring Mission (TRMM) Multisatellite Precipitation ...

Kenneth J. Tobin; Marvin E. Bennett

2010-08-01T23:59:59.000Z

282

Short-Range Ensemble Forecasts of Precipitation Type  

Science Conference Proceedings (OSTI)

Short-range ensemble forecasting is extended to a critical winter weather problem: forecasting precipitation type. Forecast soundings from the operational NCEP Short-Range Ensemble Forecast system are combined with five precipitation-type ...

Matthew S. Wandishin; Michael E. Baldwin; Steven L. Mullen; John V. Cortinas Jr.

2005-08-01T23:59:59.000Z

283

Mechanisms for Global Warming Impacts on Precipitation Frequency and Intensity  

Science Conference Proceedings (OSTI)

Global warming mechanisms that cause changes in frequency and intensity of precipitation in the tropics are examined in climate model simulations. Under global warming, tropical precipitation tends to be more frequent and intense for heavy ...

Chia Chou; Chao-An Chen; Pei-Hua Tan; Kuan Ting Chen

2012-05-01T23:59:59.000Z

284

The Influence of Land Surface Moisture Retention on Precipitation Statistics  

Science Conference Proceedings (OSTI)

The retention of precipitation water in land surface reservoirs damps higher frequencies of evaporation variability and can thereby influence the feedback of evaporation on precipitation. The extent of this influence is examined in a series of ...

Randal D. Koster; Max J. Suarez

1996-10-01T23:59:59.000Z

285

Estimates of Thunderstorm Precipitation Efficiency from Field Measurements in CCOPE  

Science Conference Proceedings (OSTI)

The precipitation efficiency (the ratio of surface rainfall to water vapor inflow) of a small sample of thunderstorms observed in the Cooperative Convective Precipitation Experiment is calculated using surface and cloud-base airflow and moisture ...

J. C. Fankhauser

1988-03-01T23:59:59.000Z

286

Storm Morphology and Rainfall Characteristics of TRMM Precipitation Features  

Science Conference Proceedings (OSTI)

Tropical Rainfall Measuring Mission (TRMM) Precipitation Radar (PR), TRMM Microwave Imager (TMI), and Visible and Infrared Scanner (VIRS) observations within the Precipitation Feature (PF) database have been analyzed to examine regional ...

Stephen W. Nesbitt; Robert Cifelli; Steven A. Rutledge

2006-10-01T23:59:59.000Z

287

Stochastic versus Dynamical Downscaling of Ensemble Precipitation Forecasts  

Science Conference Proceedings (OSTI)

The assessment of hydrometeorological risk in small basins requires the availability of skillful, high-resolution quantitative precipitation forecasts to predict the probability of occurrence of severe, localized precipitation events. Large-scale ...

Elisa Brussolo; Jost von Hardenberg; Nicola Rebora

2009-08-01T23:59:59.000Z

288

Sensitivity of Monthly Convective Precipitation to Environmental Conditions  

Science Conference Proceedings (OSTI)

Identifying dynamical and physical mechanisms controlling variability of convective precipitation is critical for predicting intraseasonal and longer-term changes in warm-season precipitation and convectively driven large-scale circulations. On a ...

Boksoon Myoung; John W. Nielsen-Gammon

2010-01-01T23:59:59.000Z

289

Precipitation Recycling: Moisture Sources over Europe using ERA-40 Data  

Science Conference Proceedings (OSTI)

Atmospheric moisture within a region is supplied by both local evaporation and advected from external sources. The contribution of local evaporation in a region to the precipitation in the same region is defined as “precipitation recycling.” ...

B. Bisselink; A. J. Dolman

2008-10-01T23:59:59.000Z

290

An Improved Operational System for Forecasting Precipitation Type  

Science Conference Proceedings (OSTI)

A Model Output Statistics system for forecasting the conditional probability of precipitation type (PoPT) became operational within the National Weather Service in September 1978. Forecasts are provided for three precipitation type categories: ...

Joseph R. Bocchieri; George J. Maglaras

1983-03-01T23:59:59.000Z

291

An Automated Radar Technique for the Identification of Tropical Precipitation  

Science Conference Proceedings (OSTI)

A radar-based automated technique for the identification of tropical precipitation was developed to improve quantitative precipitation estimation during extreme rainfall events. The technique uses vertical profiles of reflectivity to identify the ...

Xiaoyong Xu; Kenneth Howard; Jian Zhang

2008-10-01T23:59:59.000Z

292

Estimating Monthly Precipitation Reconstruction Uncertainty Beginning in 1900  

Science Conference Proceedings (OSTI)

Uncertainty estimates are computed for a statistical reconstruction of global monthly precipitation that was developed in an earlier publication. The reconstruction combined the use of spatial correlations with gauge precipitation and correlations ...

Thomas M. Smith; Samuel S. P. Shen; Li Ren; Phillip A. Arkin

2013-06-01T23:59:59.000Z

293

Inferences of Predictability Associated with Warm Season Precipitation Episodes  

Science Conference Proceedings (OSTI)

Herein preliminary findings are reported from a radar-based climatology of warm season precipitation “episodes.” Episodes are defined as time–space clusters of heavy precipitation that often result from sequences of organized convection such as ...

R. E. Carbone; J. D. Tuttle; D. A. Ahijevych; S. B. Trier

2002-07-01T23:59:59.000Z

294

Quantitative Precipitation Forecast Techniques for Use in Hydrologic Forecasting  

Science Conference Proceedings (OSTI)

Quantitative hydrologic forecasting usually requires knowledge of the spatial and temporal distribution of precipitation. First, it is important to accurately measure the precipitation falling over a particular watershed of interest. Second, ...

Konstantine P. Georgakakos; Michael D. Hudlow

1984-11-01T23:59:59.000Z

295

Diurnal Variability of Precipitation in the Northeastern United States  

Science Conference Proceedings (OSTI)

The diurnal and semidiurnal variations of precipitation over the northeastern United States (New England, New York, New Jersey and Pennsylvania) are investigated using 25 years of hourly precipitation data for 271 stations. The hourly data were ...

Michael G. Landin; Lance F. Bosart

1985-06-01T23:59:59.000Z

296

A Ground Validation Network for the Global Precipitation Measurement Mission  

Science Conference Proceedings (OSTI)

A prototype Validation Network (VN) is currently operating as part of the Ground Validation System for NASA’s Global Precipitation Measurement (GPM) mission. The VN supports precipitation retrieval algorithm development in the GPM prelaunch era. ...

Mathew R. Schwaller; K. Robert Morris

2011-03-01T23:59:59.000Z

297

PRECIPITATION METHOD FOR THE SEPARATION OF PLUTONIUM AND RARE EARTHS  

DOE Patents (OSTI)

A method of purifying plutonium is given. Tetravalent plutonium is precipitated with thorium pyrophosphate, the plutonium is oxidized to the tetravalent state, and then impurities are precipitated with thorium pyrophosphate.

Thompson, S.G.

1960-04-26T23:59:59.000Z

298

Decadal Variability of Precipitation over Western North America  

Science Conference Proceedings (OSTI)

Decadal (>7- yr period) variations of precipitation over western North America account for 20%–50% of the variance of annual precipitation. Spatially, the decadal variability is broken into several regional [O(1000 km)] components. These decadal ...

Daniel R. Cayan; Michael D. Dettinger; Henry F. Diaz; Nicholas E. Graham

1998-12-01T23:59:59.000Z

299

Deep Convection and “First Echoes” within Anvil Precipitation  

Science Conference Proceedings (OSTI)

The development of convective cells within anvil precipitation, in a region of moderate convective activity that might be called a small mesoscale convective system, is described and discussed. The presence of precipitation-sized hydrometeors in ...

Charles A. Knight; L. Jay Miller; William D. Hall

2004-07-01T23:59:59.000Z

300

Orographic Precipitation and Oregon’s Climate Transition  

Science Conference Proceedings (OSTI)

Oregon’s sharp east–west climate transition was investigated using a linear model of orographic precipitation and four datasets: (a) interpolated annual rain gauge data, (b) satellite-derived precipitation proxies (vegetation and brightness ...

Ronald B. Smith; Idar Barstad; Laurent Bonneau

2005-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "include electrostatic precipitators" 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

Stochastic Precipitation Generation Based on a Multivariate Autoregression Model  

Science Conference Proceedings (OSTI)

The problem of stochastic precipitation generation has long been of interest. A good generator should produce time series with statistical properties to match those of the real precipitation. Here, a multivariate autoregression model designed to ...

Oleg V. Makhnin; Devon L. McAllister

2009-12-01T23:59:59.000Z

302

Partially Coherent Backscatter in Radar Observations of Precipitation  

Science Conference Proceedings (OSTI)

Classical radar theory only considers incoherent backscatter from precipitation. Can precipitation generate coherent scatter as well? Until now, the accepted answer has been no, because hydrometeors are distributed sparsely in space (relative to ...

A. R. Jameson; A. B. Kostinski

2010-06-01T23:59:59.000Z

303

Optimally Merging Precipitation to Minimize Land Surface Modeling Errors  

Science Conference Proceedings (OSTI)

This paper introduces a new method to improve land surface model skill by merging different available precipitation datasets, given that an accurate land surface parameter ground truth is available. Precipitation datasets are merged with the ...

M. Tugrul Yilmaz; Paul Houser; Roshan Shrestha; Valentine G. Anantharaj

2010-03-01T23:59:59.000Z

304

Diurnal Variations of Warm-Season Precipitation over Northern China  

Science Conference Proceedings (OSTI)

This study examines the diurnal variations of the warm-season precipitation over northern China using the high-resolution precipitation products obtained from the Climate Prediction Center’s morphing technique (CMORPH) during May–August of 2003–...

Huizhong He; Fuqing Zhang

2010-04-01T23:59:59.000Z

305

Changes in Intense Precipitation over the Central United States  

Science Conference Proceedings (OSTI)

In examining intense precipitation over the central United States, the authors consider only days with precipitation when the daily total is above 12.7 mm and focus only on these days and multiday events constructed from such consecutive ...

Pavel Ya. Groisman; Richard W. Knight; Thomas R. Karl

2012-02-01T23:59:59.000Z

306

A Screening Methodology for Passive Microwave Precipitation Retrieval Algorithms  

Science Conference Proceedings (OSTI)

The success of any passive microwave precipitation retrieval algorithm relies on the proper identification of rain areas and the elimination of surface areas that produce a signature similar to that of precipitation. A discussion on the impact of ...

Ralph R. Ferraro; Eric A. Smith; Wesley Berg; George J. Huffman

1998-05-01T23:59:59.000Z

307

Spatial and Temporal Characteristics of Heavy Precipitation Events over Canada  

Science Conference Proceedings (OSTI)

Spatial and temporal characteristics of heavy precipitation events over Canada (excluding the high Arctic) are examined for the period 1900–98. In southern Canada, about 71% of total precipitation comes from rainfall events. In northern Canada, ...

Xuebin Zhang; W. D. Hogg; Éva Mekis

2001-05-01T23:59:59.000Z

308

The Global Precipitation Climatology Project: First Algorithm Intercomparison Project  

Science Conference Proceedings (OSTI)

The Global Precipitation Climatology Project (GPCP) was established by the World Climate Research Programme to produce global analyses of area- and time-averaged precipitation for use in climate research. To achieve the required spatial coverage, ...

Phillip A. Arkin; Pingping Xie

1994-03-01T23:59:59.000Z

309

Diurnal Precipitation Variations in South-Central New Mexico  

Science Conference Proceedings (OSTI)

Orographic forcing of diurnal precipitation variations in south-central New Mexico is examined. Harmonic analysis reveals a strong diurnal cycle in precipitation frequency at all stations studied. In addition, relatively high amplitudes in the ...

Donna F. Tucker

1993-07-01T23:59:59.000Z

310

Spatial and Temporal Variability of Monthly Precipitation in Texas  

Science Conference Proceedings (OSTI)

Monthly precipitation at 46 stations located throughout the state of Texas was examined over a continuous 62-year period from 1923 to 1984. Precipitation data were subjected to spectral, empirical orthogonal function (EOF) and correlation ...

Steven W. Lyons

1990-12-01T23:59:59.000Z

311

Global estimation of precipitation using opaque microwave bands  

E-Print Network (OSTI)

This thesis describes the use of opaque microwave bands for global estimation of precipitation rate. An algorithm was developed for estimating instantaneous precipitation rate for the Advanced Microwave Sounding Unit (AMSU) ...

Chen, Frederick Wey-Min, 1975-

2004-01-01T23:59:59.000Z

312

Biologically produced acid precipitable polymeric lignin  

DOE Patents (OSTI)

A water soluble, acid precipitable polymeric degraded lignin (APPL), having a molecular weight of at least 12,000 daltons, and comprising, by percentage of total weight, at least three times the number of phenolic hydroxyl groups and carboxylic acid groups present in native lignin. The APPL may be modified by chemical oxidation and reduction to increase its phenolic hydroxyl content and reduce the number of its antioxidant inhibitory side chains, thereby improving antioxidant properties.

Crawford, Don L. (Moscow, ID); Pometto, III, Anthony L. (Moscow, ID)

1984-01-01T23:59:59.000Z

313

Thermodynamic modeling for organic solid precipitation  

SciTech Connect

A generalized predictive model which is based on thermodynamic principle for solid-liquid phase equilibrium has been developed for organic solid precipitation. The model takes into account the effects of temperature, composition, and activity coefficient on the solubility of wax and asphaltenes in organic solutions. The solid-liquid equilibrium K-value is expressed as a function of the heat of melting, melting point temperature, solubility parameter, and the molar volume of each component in the solution. All these parameters have been correlated with molecular weight. Thus, the model can be applied to crude oil systems. The model has been tested with experimental data for wax formation and asphaltene precipitation. The predicted wax appearance temperature is very close to the measured temperature. The model not only can match the measured asphaltene solubility data but also can be used to predict the solubility of asphaltene in organic solvents or crude oils. The model assumes that asphaltenes are dissolved in oil in a true liquid state, not in colloidal suspension, and the precipitation-dissolution process is reversible by changing thermodynamic conditions. The model is thermodynamically consistent and has no ambiguous assumptions.

Chung, T.H.

1992-12-01T23:59:59.000Z

314

Precipitate Phases in Several High Temperature Shape Memory ...  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, Materials Science & Technology 2011. Symposium, Shape Memory Alloys. Presentation Title, Precipitate Phases in Several High ...

315

A Modeling Tool for the Precipitation Simulations of Superalloys ...  

Science Conference Proceedings (OSTI)

simulate the complicated precipitations and microstructure .... The kinetic simulation employs three models to treat three ..... Thermochemistry 26, 175 (

316

Theory for growth of spherical precipitates with capillarity effects  

E-Print Network (OSTI)

precipitation in power plant steels,1,2 there is no analytical solution for the growth of a sphereTheory for growth of spherical precipitates with capillarity effects P. E. J. Rivera-Dõ�az-del-Castillo and H. K. D. H. Bhadeshia Analytical solutions are presented for the growth of spherical precipitates

Cambridge, University of

317

Orographic Enhancement of Precipitation over Low Mountain Ranges. Part II: Simulations of Heavy Precipitation Events over Southwest Germany  

Science Conference Proceedings (OSTI)

A diagnostic precipitation model that combines linear theory of hydrostatic flow with parameterized microphysics is applied to several stratiform heavy precipitation events over the low mountain ranges of southwestern Germany. Model-simulated ...

Michael Kunz; Christoph Kottmeier

2006-08-01T23:59:59.000Z

318

The Precipitation Anomaly Classification: A Method for Monitoring Regional Precipitation Deficiency and Excess on a Global Scale  

Science Conference Proceedings (OSTI)

An objective method to identify and track significant global precipitation anomalies on time scales of a month or longer is presented. The technique requires current observations of monthly precipitation amounts for each station and long term (20 ...

J. E. Janowiak; C. F. Ropelewski; M. S. Halpert

1986-04-01T23:59:59.000Z

319

The TRMM Multisatellite Precipitation Analysis (TMPA): Quasi-Global, Multiyear, Combined-Sensor Precipitation Estimates at Fine Scales  

Science Conference Proceedings (OSTI)

The Tropical Rainfall Measuring Mission (TRMM) Multisatellite Precipitation Analysis (TMPA) provides a calibration-based sequential scheme for combining precipitation estimates from multiple satellites, as well as gauge analyses where feasible, ...

George J. Huffman; David T. Bolvin; Eric J. Nelkin; David B. Wolff; Robert F. Adler; Guojun Gu; Yang Hong; Kenneth P. Bowman; Erich F. Stocker

2007-02-01T23:59:59.000Z

320

Nonlinear, stationary electrostatic ion cyclotron waves: Exact solutions for solitons, periodic waves, and wedge shaped waveforms  

Science Conference Proceedings (OSTI)

The theory of fully nonlinear stationary electrostatic ion cyclotron waves is further developed. The existence of two fundamental constants of motion; namely, momentum flux density parallel to the background magnetic field and energy density, facilitates the reduction of the wave structure equation to a first order differential equation. For subsonic waves propagating sufficiently obliquely to the magnetic field, soliton solutions can be constructed. Importantly, analytic expressions for the amplitude of the soliton show that it increases with decreasing wave Mach number and with increasing obliquity to the magnetic field. In the subsonic, quasi-parallel case, periodic waves exist whose compressive and rarefactive amplitudes are asymmetric about the 'initial' point. A critical 'driver' field exists that gives rise to a soliton-like structure which corresponds to infinite wavelength. If the wave speed is supersonic, periodic waves may also be constructed. The aforementioned asymmetry in the waveform arises from the flow being driven towards the local sonic point in the compressive phase and away from it in the rarefactive phase. As the initial driver field approaches the critical value, the end point of the compressive phase becomes sonic and the waveform develops a wedge shape. This feature and the amplitudes of the compressive and rarefactive portions of the periodic waves are illustrated through new analytic expressions that follow from the equilibrium points of a wave structure equation which includes a driver field. These expressions are illustrated with figures that illuminate the nature of the solitons. The presently described wedge-shaped waveforms also occur in water waves, for similar 'transonic' reasons, when a Coriolis force is included.

McKenzie, J. F. [Department of Mathematics, Statistics and Physics, Durban University of Technology, Steve Biko Campus, Durban 4001 (South Africa); School of Mathematical Sciences, University of KwaZulu-Natal, Private Bag: X54001, Durban 4001 (South Africa); Doyle, T. B. [Materials Research Division, iThemba LABS, P.O.Box 722, Somerset West, 7129, South Africa and School of Chemistry and Physics, University of KwaZulu-Natal, Private Bag: X54001, Durban 4001 (South Africa); Rajah, S. S. [Department of Mathematics, Statistics and Physics, Durban University of Technology, Steve Biko Campus, Durban 4001 (South Africa)

2012-11-15T23:59:59.000Z

Note: This page contains sample records for the topic "include electrostatic precipitators" 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

The development of precipitated iron catalysts with improved stability  

DOE Green Energy (OSTI)

The goal of this program is to identify the chemical principles governing the deactivation of precipitated iron catalysts during Fischer-Tropsch synthesis and to use these chemical principles in the design of catalysts suitable for slurry reactors. This report covers testing an iron catalyst. During the last quarter, a new precipitated iron catalyst was prepared and tested in the slurry autoclave reactor at various conditions. This catalyst did not noticeably deactivate during 1250 hours of testing. This quarter, the test was extended to include performance evaluations at different conversion levels ranging from 35 to 88% at 265 and 275{degree}C. The conversion levels were varied by changing the feed rate. The catalytic performance at different conversion intervals was then integrated to approximately predict performance in a bubble column reactor. The run was shut down at the end of 1996 hours because of a 24-hour-power outage. When the power was back on, the run was restarted from room temperature. Catalytic performance during the first 300 hours after the restart-up was monitored. Overall product distributions are being tabulated as analytical laboratory data are obtained. 34 figs., 3 tabs.

Not Available

1990-01-01T23:59:59.000Z

322

High post-irradiation ductility thermomechanical treatment for precipitation strengthened austenitic alloys  

DOE Patents (OSTI)

A method for improving the post-irradiation ductility is described which prises a solution heat treatment following which the materials are cold worked. They are included to demonstrate the beneficial effect of this treatment on the swelling resistance and the ductility of these austenitic precipitation hardenable alloys.

Laidler, James J. (Richland, WA); Borisch, Ronald R. (Kennewick, WA); Korenko, Michael K. (Rockville, MD)

1982-01-01T23:59:59.000Z

323

MAP3S Precipitation Chemistry Network: fifth periodic summary report (1981)  

Science Conference Proceedings (OSTI)

This, the fifth in a series of summary reports, contains complete field and chemical data from the MAP3 Precipitation Chemistry Network for the year 1981. The 1981 data were added to the previous data base, and an update of the previous five year statistical summary completed. Included are basic statistics, time trend analyses, and monthly averages.

Dana, M.T.; Rothert, J.E.

1983-02-01T23:59:59.000Z

324

Science Accelerator content now includes multimedia  

Office of Scientific and Technical Information (OSTI)

Science Accelerator content now includes multimedia Science Accelerator has expanded its suite of collections to include ScienceCinema, which contains videos produced by the U.S....

325

Neptunium_Oxide_Precipitation_Kinetics_AJohnsen  

SciTech Connect

We evaluate the proposed NpO{sub 2}{sup +}(aq)-NpO{sub 2}(cr) reduction-precipitation system at elevated temperatures to obtain primary information on the effects of temperature, ionic strength, O{sub 2} and CO{sub 2}. Experiments conducted on unfiltered solutions at 10{sup -4} M NpO{sub 2}{sup +}(aq), neutral pH, and 200 C indicated that solution colloids strongly affect precipitation kinetics. Subsequent experiments on filtered solutions at 200, 212, and 225 C showed consistent and distinctive temperature-dependent behavior at reaction times {le} 800 hours. At longer times, the 200 C experiments showed unexpected dissolution of neptunium solids, but experiments at 212 C and 225 C demonstrated quasi steady-state neptunium concentrations of 3 x 10{sup -6} M and 6 x 10{sup -6} M, respectively. Solids from a representative experiment analyzed by X-ray diffraction were consistent with NpO{sub 2}(cr). A 200 C experiment with a NaCl concentration of 0.05 M showed a dramatic increase in the rate of neptunium loss. A 200 C experiment in an argon atmosphere resulted in nearly complete loss of aqueous neptunium. Previously proposed NpO{sub 2}{sup +}(aq)-NpO{sub 2}(cr) reduction-precipitation mechanisms in the literature specified a 1:1 ratio of neptunium loss and H{sup +} production in solution over time. However, all experiments demonstrated ratios of approximately 0.4 to 0.5. Carbonate equilibria can account for only about 40% of this discrepancy, leaving an unexpected deficit in H+ production that suggests that additional chemical processes are occurring.

Johnsen, A M; Roberts, K E; Prussin, S G

2012-06-08T23:59:59.000Z

326

Modeling of asphaltene and wax precipitation  

SciTech Connect

This research project was designed to focus on the development of a predictive technique for organic deposition during gas injection for petroleum EOR. A thermodynamic model has been developed to describe the effects of temperature, pressure, and composition on asphaltene precipitation. The proposed model combines regular solution theory with Flory-Huggins polymer solutions theory to predict maximum volume fractions of asphaltene dissolved in oil. The model requires evaluation of vapor-liquid equilibria, first using an equation of state followed by calculations of asphaltene solubility in the liquid-phase. A state-of-the-art technique for C{sub 7+} fraction characterization was employed in developing this model. The preliminary model developed in this work was able to predict qualitatively the trends of the effects of temperature, pressure, and composition. Since the mechanism of paraffinic wax deposition is different from that of asphaltene deposition, another thermodynamic model based on the solid-liquid solution theory was developed to predict the wax formation. This model is simple and can predict the wax appearance temperature with reasonable accuracy. Accompanying the modeling work, experimental studies were conducted to investigate the solubility of asphaltene in oil land solvents and to examine the effects of oil composition, CO{sub 2}, and solvent on asphaltene precipitation and its properties. This research focused on the solubility reversibility of asphaltene in oil and the precipitation caused by CO{sub 2} injection at simulated reservoir temperature and pressure conditions. These experiments have provided many observations about the properties of asphaltenes for further improvement of the model, but more detailed information about the properties of asphaltenes in solution is needed for the development of more reliable asphaltene characterization techniques. 50 refs., 8 figs., 7 tabs.

Chung, F.; Sarathi, P.; Jones, R.

1991-01-01T23:59:59.000Z

327

Electrostatics for Exploring the Nature of Water Adsorption on ...  

Science Conference Proceedings (OSTI)

... Introduction ... and become dispersed as colloidal platelets, and the sodium cations ... to include polymer adsorption on hydrated clay surfaces, which is ...

2010-12-13T23:59:59.000Z

328

DECONTAMINATION OF PLUTONIUM FOR FLUORIDE AND CHLORIDE DURING OXALATE PRECIPITATION, FILTRATION AND CALCINATION PROCESSES  

SciTech Connect

Due to analytical limitations for the determination of fluoride (F) and chloride (Cl) in a previous anion exchange study, an additional study of the decontamination of Pu from F and Cl by oxalate precipitation, filtration and calcination was performed. Anion product solution from the previous impurity study was precipitated as an oxalate, filtered, and calcined to produce an oxide for analysis by pyrohydrolysis for total Cl and F. Analysis of samples from this experiment achieved the purity specification for Cl and F for the proposed AFS-2 process. Decontamination factors (DF's) for the overall process (including anion exchange) achieved a DF of {approx}5000 for F and a DF of {approx}100 for Cl. Similar experiments where both HF and HCl were spiked into the anion product solution to a {approx}5000 {micro}g /g Pu concentration showed a DF of 5 for F and a DF of 35 for Cl across the combined precipitation-filtration-calcination process steps.

Kyser, E.

2012-07-25T23:59:59.000Z

329

Steady states and linear stability analysis of precipitation pattern formation at geothermal hot springs  

E-Print Network (OSTI)

A dynamical theory of geophysical precipitation pattern formation is presented and applied to irreversible calcium carbonate (travertine) deposition. Specific systems studied here are the terraces and domes observed at geothermal hot springs, such as those at Yellowstone National Park, and speleothems, particularly stalactites and stalagmites. The theory couples the precipitation front dynamics with shallow water flow, including corrections for turbulent drag and curvature effects. In the absence of capillarity and with a laminar flow profile, the theory predicts a one-parameter family of steady state solutions to the moving boundary problem describing the precipitation front. These shapes match well the measured shapes near the vent at the top of observed travertine domes. Closer to the base of the dome, the solutions deviate from observations, and circular symmetry is broken by a fluting pattern, which we show is associated with capillary forces causing thin film break-up. We relate our model to that recent...

Chan, Pak Yuen

2007-01-01T23:59:59.000Z

330

Petroleum Gasoline & Distillate Needs Including the Energy ...  

U.S. Energy Information Administration (EIA)

Petroleum Gasoline & Distillate Needs Including the Energy Independence and Security Act (EISA) Impacts

331

Petroleum Gasoline & Distillate Needs Including the Energy ...  

U.S. Energy Information Administration (EIA)

Home > Petroleum > Analysis > Petroleum Gasoline & Distillate Needs Including the Energy Independence and Security Act (EISA) ...

332

Species and community response to above normal precipitation following prolonged drought in the northern Mojave Desert  

Science Conference Proceedings (OSTI)

Little information is available on how desert plant communities that are dominated by perennial species respond to normal and above normal precipitation following prolonged drought. Intuitively, one would expect total canopy cover to increase. Whether a concomitant increase in the density of perennial species also occurs is unknown. Even less is known about how individual species respond to above normal precipitation following drought. From 1987 through 1991 a prolonged drought occurred in much of the western United States, including the northern Mojave Desert. In March 1991 the northern Mojave Desert received well above normal precipitation. The following two winters (December--March) also had above normal precipitation (150 to 200 % of normal, unpublished data). Ongoing vegetation characterization studies by the US Department of Energy (DOE) at Yucca Mountain, Nevada, allowed EG&G Energy Measurements to collect data that could be used to infer how both vegetation associations and individual species respond to above normal precipitation following prolonged drought. This paper reports the preliminary results.

Schultz, B.W. [Nevada Univ., Reno, NV (United States). Desert Research Inst.; Ostler, W.K. [EG and G Energy Measurements, Inc., Las Vegas, NV (United States)

1993-12-31T23:59:59.000Z

333

Interannual variability of summer precipitation in Texas and its implication to summer drought  

E-Print Network (OSTI)

Since Texas normally receives most of its precipitation in the warm season, precipitation deficits in summertime may bring serious agricultural and hydrological disasters. While the underlying physical processes of summer precipitation deficit and drought are unclear, they can be understood in terms of convective instability. This research is designed to investigate how convective instability influences monthly mean precipitation in Texas in the summertime and to examine the modulation of convective instability and precipitation by upper-level circulations, soil moisture, vertical motion, and low-tropospheric warm air transport using NCEP/NCAR reanalysis data. Statistical approaches including correlation analysis, multiple linear regression analysis and back trajectory analysis were used to reveal the underlying dynamics of their linkage and causality. The results show that warming at 700 mb and surface dryness result in excessive convective inhibition (CIN), leading to precipitation deficits on a monthly time-scale. Temperature at 700 mb (Tlt) and surface dewpoint have little correlation suggesting different processes contribute to warming at 700 mb and surface dryness, respectively. Correlation analysis among the surface variables emphasizes the role of soil moisture on the dewpoint and thermodynamics at the surface. Back trajectory analysis indicates that a significant contributor to warming at 700 mb is the inversion caused by warm air transport from the Rocky Mountains and the Mexican Plateau where the surface potential temperature is greater than 307.5K rather than by subsidence. It was found that downward motion and warm air transport are enhanced in Texas when upper-level anticyclonic circulation develops in the southern US. Upper-level anticyclonic circulations in the southern US strongly affect Texas summertime precipitation by modulating the principal processes as follows. They increase CIN not only by enhancing warm air transport from the high terrain but also by suppressing occurrence of disturbances. The resulting reduced precipitation and dry soil significantly modulate surface conditions, which elevates CIN and decreases precipitation. The aforementioned chain-reaction of upper-level anticyclone influences can be understood in the context of CIN.

Myoung, Boksoon

2007-08-01T23:59:59.000Z

334

Efficient Evaluation of Binding Free Energy Using Continuum Electrostatics Danzhi Huang and Amedeo Caflisch*  

E-Print Network (OSTI)

Efficient Evaluation of Binding Free Energy Using Continuum Electrostatics Solvation Danzhi Huang of the absolute free energy of binding. A predictive accuracy of about 1.0 kcal/mol is obtained for 13 and 29 into proteins of known structure require fast and accurate methods for the evaluation of binding free energies.1

Caflisch, Amedeo

335

Anomalous diffusion and ion heating in the presence of electrostatic hydrogen cyclotron instabilities  

DOE Green Energy (OSTI)

One- and two-dimensional simulations have been carried out to study electrostatic ion cyclotron instabilities for a hydrogen plasma in a strong magnetic field. It is found that strong ion heating and anomalous cross-field diffusion comparable to Bohm diffusion take place associated with the instability. Implications of the instability to the recent observations in fusion devices and space plasmas are discussed.

Okuda, H.; Cheng, C.Z.; Lee, W.W.

1980-11-01T23:59:59.000Z

336

Carbon nanotube vertical membranes for electrostatically actuated micro-electro-mechanical devices  

Science Conference Proceedings (OSTI)

In this work, we investigate vertically aligned carbon nanotube (CNT) membranes as building blocks to realize electrostatically actuated micro-electro-mechanical-systems (MEMS). The fabricated CNT dense arrays are grown on adjacent metal electrodes and ... Keywords: Capacitors, Carbon nanotube, MEMS, Membrane, NEMS, Vertically aligned

A. Arun; D. Acquaviva; M. Fernández-Bolaños; P. Salet; H. Le-Poche; P. Pantigny; T. Idda; A. M. Ionescu

2010-05-01T23:59:59.000Z

337

Electrostatic Charge and Its Influence on the Condensation of Steam in a Turbine  

Science Conference Proceedings (OSTI)

Some major contributors to efficiency loss in a fossil or nuclear plant are associated with nucleation of moisture from superheated steam, formation and release of liquid films on turbine surfaces, and flow of moist steam into the turbine exhaust and condenser. This document provides a state-of-knowledge report on the various electrostatic processes involved.

2001-09-28T23:59:59.000Z

338

Free-energy functionals of the electrostatic potential for Poisson-Boltzmann theory  

E-Print Network (OSTI)

In simulating charged systems, it is often useful to treat some ionic components of the system at the mean-field level and solve the Poisson-Boltzmann (PB) equation to get their respective density profiles. The numerically intensive task of solving the PB equation at each step of the simulation can be bypassed using variational methods that treat the electrostatic potential as a dynamic variable. But such approaches require the access to a true free-energy functional; a functional that not only provides the correct solution of the PB equation upon extremization, it also evaluates to the true free energy of the system at its minimum. Moreover, the numerical efficiency of such procedures is further enhanced if the free-energy functional is local and is expressed in terms of the electrostatic potential. Existing PB functionals of the electrostatic potential, while possessing the local structure, are not free-energy functionals. We present a variational formulation with a local free-energy functional of the potential. In addition, we also construct a nonlocal free-energy functional of the electrostatic potential. These functionals are suited for employment in simulation schemes based on the ideas of dynamical optimization.

Vikram Jadhao; Francisco J. Solis; Monica Olvera de la Cruz

2013-09-26T23:59:59.000Z

339

Defect processes involving oxygen-compensated sites in CaF/sub 2/ precipitates doped with lanthanides and actinides  

Science Conference Proceedings (OSTI)

Oxygen incorporation into calcium fluoride precipitates doped with lanthanides and actinides is investigated by use of the technique of site-selective spectroscopy. Fluorescence from erbium in specific fluoride- and oxygen-compensated sites is monitored as a function of the ignition temperature of the precipitate to study the conversion from fluoride to oxygen compensation. Another process, thermal annealing of a disordered precipitate to give a well-defined lattice, is also followed. Changes in both oxygen compensation formation and lattice annealing are found to occur upon the addition of other trivalent and monovalent ions. The results provide a better understanding of the solid-state chemistry involved in new methods of chemical analysis using rare-earth doped CaF/sub 2/ precipitates, and how certain interference effects can arise. Also included is a study of the temperature dependence of fluorescent sites in CaF/sub 2/:U/sup 6 +/.

Johnston, M.V.; Wright, J.C.

1981-10-15T23:59:59.000Z

340

Comparison of soy protein concentrates produced by membrane filtration and acid precipitation  

E-Print Network (OSTI)

The recovery of proteins using ultrafiltration (UF) process is an attractive alternative compared to conventional acid precipitation method. The mild processing condition, which leads to less protein denaturation, may be one of major virtues of this method. This research was directed to identify such assumptions of the products. Three soy protein concentrates were obtained in this study. Full-fat soybean flour and hexane-defatted soybean flour were dispersed into distilled water (1:8) at 60?C, respectively. A series of operations including pH adjustment (8.0), agitation (250 rpm, 30 min), sonication (40 dB, 20 min), homogenization (3 min), and centrifugation (3,000 x g, 15 min) were followed. For the membrane processing, the ultrafiltration cartridge used molecular weight cut-off 100,000 daltons. Acid-precipitated protein (at pH 4.5) was produced from hexane-defatted soybean flour following the identical procedures as above. Protein content of the membrane-processed product from full-fat soybean flour was 63.5% and that of the acid precipitated product was 71.9%. All samples were comparable in their functional properties. Nitrogen solubility at pH 7.0 was exhibited better in the protein produced by membrane filtration than the protein produced by acid precipitation due to protein denaturation. Also the membrane-processed soy protein showed good heat coagulation, emulsifying stability, and foaming stability. Amino acid patterns were similar to the typical one of soy proteins. However, relatively low lysine, threonine and valine contents in the acid-precipitated protein were noteworthy. The sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) patterns were almost comparable among samples. In appearance, the acid-precipitated protein was light and slightly greenish tint.

Kim, Hyun Jung

2003-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "include electrostatic precipitators" 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

Summer and Winter Precipitation in England and Wales: 1874 -...  

Open Energy Info (EERE)

and Wales: 1874 - 2009 This dataset, made available by the UK Department of Energy and Climate Change (DECC), presents summer and winter precipitation for England and Wales, and...

342

ATOMIC STRUCTURE OF PRECIPITATES IN A Mg-Re SYSTEM ...  

Science Conference Proceedings (OSTI)

Jul 20, 2012 ... ATOMIC STRUCTURE OF PRECIPITATES IN A Mg-Re SYSTEM ... Though the age hardening response in Mg-Nd is established for a long time ...

343

Daily Temperature and Precipitation Data for 518 Russian Meteorologica...  

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

and precipitation values are contained in 518 station files in the Russiastations directory with names of the form "XXXXX.txt", with "XXXXX" representing World...

344

Deformation Mechanisms and Precipitate Structure in Ni-Base ...  

Science Conference Proceedings (OSTI)

Differential Characterization of Ikperejere Iron shale and Iron Sandstone Deposit · Direct Precipitation of Sr-doped LaP3O9 Thin Film Electrolytes for ...

345

An Integrated CALPHAD Tool for Modeling Precipitation Kinetics ...  

Science Conference Proceedings (OSTI)

Presentation Title, An Integrated CALPHAD Tool for Modeling Precipitation Kinetics and Accelerating Materials Design. Author(s), Qing Chen, Herng-Jeng Jou, ...

346

Evolution of Size and Morphology of gamma' Precipitates in UDIMET ...  

Science Conference Proceedings (OSTI)

nucleation bursts during continuous cooling from the solution annealed state .... ( EELS) and X-ray dispersive spectroscopy (EDX) are used for the precipitate ...

347

Precipitates in Long Term Aging Al 5083 Alloy  

Science Conference Proceedings (OSTI)

Presentation Title, Precipitates in Long Term Aging Al 5083 Alloy. Author(s), Gaosong Yi. On-Site Speaker (Planned), Gaosong Yi. Abstract Scope, Al 5083 alloy ...

348

Diurnal variation of tropical precipitation using five years TRMM data  

E-Print Network (OSTI)

The tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) and Precipitation Radar (PR) data are used in this study to reveal diurnal variations of precipitation over the Tropics (30?S ? 30?N) from January, 1998, to December 2002. The TMI data were used for the regions over oceans and islands and the PR data was used over continents. The observations are sorted regionally to examine the difference in diurnal cycle of rainfall over ocean, island, and continental regions. The rain rate is averaged over individual two hour intervals of local time in each region to include more observations in order to reduce the sampling error. F-test is used to determine those regions whose diurnal cycle is detected at the 95% confidence level. In most oceanic regions there is a maximum at 0400 LST - 0700 LST. The amplitude of diurnal variation over ocean regions with small total rain is a little higher than that of the ocean regions with heavy total rain. The diurnal cycle peaks at 0700 LST - 0800 LST over islands with rainfall variation similar to surrounding oceanic regions. A maximum at 1400 LST - 1500 LST was found in areas over continents with heavy total rain, while the maximum occured at 1900 LST - 2100 LST over continents with lesser total rain. The amplitudes of variation over continents with heavy total rain and with small total rain do not show significant differences. The diurnal cycle in in JJA (June, July, August) and DJF (December, January, February) varies with latitude over continents. A seasonal cycle of diurnal cycle can also be found in some oceanic regions. The diurnal cycle annual change is not evident over continents, while the diurnal cycle annual change over oceans exists in some regions. Island regions in this paper exhibit no evident seasonal and annual diurnal change.

Wu, Qiaoyan

2004-08-01T23:59:59.000Z

349

Yukawa-field approximation of electrostatic free energy and dielectric boundary force This article has been downloaded from IOPscience. Please scroll down to see the full text article.  

E-Print Network (OSTI)

Yukawa-field approximation of electrostatic free energy and dielectric boundary force This article.1088/0951-7715/24/11/011 Yukawa-field approximation of electrostatic free energy and dielectric boundary force Hsiao-Bing Cheng1. The electrostatic free energy determines the dielectric boundary force that in turn influences crucially

Li, Bo

350

Co-precipitation synthesis and sintering of yttrium aluminum garnet (YAG) powders: the eect of precipitant  

E-Print Network (OSTI)

Vacuum sintering was performed in a furnace heated by a tungsten-mesh heater (Model M60-3X8-WW-23, Nemus co-precipitated from a mixed solution of aluminum and yttrium nitrates using ammonia water of ammonia water produced a hydroxide pre- cursor with an approximate composition of Al(OH)3 .0.3[Y2(OH)5(NO3

Lee, Jong-Heun

351

On the complex conductivity signatures of calcite precipitation  

Science Conference Proceedings (OSTI)

Calcite is a mineral phase that frequently precipitates during subsurface remediation or geotechnical engineering processes. This precipitation can lead to changes in the overall behavior of the system, such as flow alternation and soil strengthening. Because induced calcite precipitation is typically quite variable in space and time, monitoring its distribution in the subsurface is a challenge. In this research, we conducted a laboratory column experiment to investigate the potential of complex conductivity as a mean to remotely monitor calcite precipitation. Calcite precipitation was induced in a glass bead (3 mm) packed column through abiotic mixing of CaCl{sub 2} and Na{sub 2}CO{sub 3} solutions. The experiment continued for 12 days with a constant precipitation rate of {approx}0.6 milimole/d. Visual observations and scanning electron microscopy imaging revealed two distinct phases of precipitation: an earlier phase dominated by well distributed, discrete precipitates and a later phase characterized by localized precipitate aggregation and associated pore clogging. Complex conductivity measurements exhibited polarization signals that were characteristic of both phases of calcite precipitation, with the precipitation volume and crystal size controlling the overall polarization magnitude and relaxation time constant. We attribute the observed responses to polarization at the electrical double layer surrounding calcite crystals. Our experiment illustrates the potential of electrical methods for characterizing the distribution and aggregation state of nonconductive minerals like calcite. Advancing our ability to quantify geochemical transformations using such noninvasive methods is expected to facilitate our understanding of complex processes associated with natural subsurface systems as well as processes induced through engineered treatments (such as environmental remediation and carbon sequestration).

Wu, Yuxin; Hubbard, Susan; Williams, Kenneth Hurst; Ajo-Franklin, Jonathan

2009-11-01T23:59:59.000Z

352

Gas storage materials, including hydrogen storage materials  

DOE Patents (OSTI)

A material for the storage and release of gases comprises a plurality of hollow elements, each hollow element comprising a porous wall enclosing an interior cavity, the interior cavity including structures of a solid-state storage material. In particular examples, the storage material is a hydrogen storage material such as a solid state hydride. An improved method for forming such materials includes the solution diffusion of a storage material solution through a porous wall of a hollow element into an interior cavity.

Mohtadi, Rana F; Wicks, George G; Heung, Leung K; Nakamura, Kenji

2013-02-19T23:59:59.000Z

353

Modification of Precipitation from Warm Clouds—A Review  

Science Conference Proceedings (OSTI)

This review is begun with a brief summary of the current status of our understanding of the physics of precipitation in warm clouds. The impact of warm-cloud precipitation processes on the evolution of the ice phase in supercooled clouds also is ...

William R. Cotton

1982-02-01T23:59:59.000Z

354

An Improved Gridded Historical Daily Precipitation Analysis for Brazil  

Science Conference Proceedings (OSTI)

A gauge-only precipitation data quality control and analysis system has been developed for monitoring precipitation at NOAA’s Climate Prediction Center (CPC). Over the past 10 yr the system has been used to develop and deliver many different ...

Viviane B. S. Silva; Vernon E. Kousky; Wei Shi; R. Wayne Higgins

2007-08-01T23:59:59.000Z

355

A Blended Satellite Total Precipitable Water Product for Operational Forecasting  

Science Conference Proceedings (OSTI)

Total precipitable water (TPW), the amount of water vapor in a column from the surface of the earth to space, is used by forecasters to predict heavy precipitation. In this paper, a process for blending TPW values retrieved from two satellite ...

Stanley Q. Kidder; Andrew S. Jones

2007-01-01T23:59:59.000Z

356

The Measurement of Precipitation with Synthetic Aperture Radar  

Science Conference Proceedings (OSTI)

The radar equation for the measurement of precipitation by SAR is identical to that for a conventional radar. The achievable synthetic beamwidth, ?s, is proportional to ?v/U, the ratio of the spread of the precipitation Doppler spectrum to the ...

David Atlas; Richard K. Moore

1987-09-01T23:59:59.000Z

357

A Model to Predict the Probability of Precipitation  

Science Conference Proceedings (OSTI)

A model to predict the probability of a specific amount of accumulated precipitation at a point in an area of extended convective precipitation has been developed. The model has been used in conjunction with a large-scale numerical forecast model ...

Ulla Hammarstrand

1980-06-01T23:59:59.000Z

358

SEPARATION OF FISSION PRODUCTS FROM PLUTONIUM BY PRECIPITATION  

DOE Patents (OSTI)

Fission product separation from hexavalent plutonium by bismuth phosphate precipitation of the fission products is described. The precipitation, according to this invention, is improved by coprecipitating ceric and zirconium phosphates (0.05 to 2.5 grams/liter) with the bismuth phosphate.

Seaborg, G.T.; Thompson, S.G.; Davidson, N.R.

1959-09-01T23:59:59.000Z

359

Are Precipitation Levels Getting Higher? Statistical Evidence for the Netherlands  

Science Conference Proceedings (OSTI)

One of the possible consequences of global warming is that there will be more days with precipitation throughout the year, and also that the level of precipitation will be higher. In this paper a detailed statistical analysis of a century of ...

Alex J. Koning; Philip Hans Franses

2005-11-01T23:59:59.000Z

360

Predicting Nickel Precipitate Formation in Contaminated Soils. (3717)  

E-Print Network (OSTI)

Predicting Nickel Precipitate Formation in Contaminated Soils. (3717) Authors: E. Peltier* - Univ in contaminated soils plays a crucial role in determining the long term fate of toxic metal pollutants speciation in laboratory contaminated soils with thermodynamic and kinetic analyses of precipitate stability

Sparks, Donald L.

Note: This page contains sample records for the topic "include electrostatic precipitators" 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

13 - Aging Effects on the ?´ and ?" Precipitates of Inconel 718 ...  

Science Conference Proceedings (OSTI)

Finally a double-aging at 720 ºC, 8 h/FC at 57 ºC/h down to 620 ºC, 8 h/AC to precipitate both ?´ and ?"? phases. The precipitation of both ?´ and ?" phases were ...

362

Phase-Field Modeling of Solute Precipitation and Dissolution  

Science Conference Proceedings (OSTI)

A phase-field approach to the dynamics of liquid-solid interfaces that evolve due to precipitation and/or dissolution is presented. For the purpose of illustration and comparison with other methods, phase field simulations were carried out assuming first order reaction (dissolution/precipitation) kinetics. In contrast to solidification processes controlled by a temperature field that is continuous across the solid/liquid interface (with a discontinuous temperature gradient) precipitation/dissolution is controlled by a solute concentration field that is discontinuous at the solid/liquid interface. The sharp-interface asymptotic analysis of the phase-field equations for solidification [Karma and Rappel, Phys. Rev. E57 (1998) 4342] has been modified for precipitation/dissolution processes to demonstrate that the phase-field equations converge to the proper sharp-interface limit. The mathematical model has been validated for a one-dimensional precipitation/dissolution problem by comparison with the analytical solution.

Zhijie Xu; Paul Meakin

2008-07-01T23:59:59.000Z

363

A linear merging methodology for high-resolution precipitation products using spatiotemporal regression  

SciTech Connect

Currently, the only viable option for a global precipitation product is the merger of several precipitation products from different modalities. In this article, we develop a linear merging methodology based on spatiotemporal regression. Four highresolution precipitation products (HRPPs), obtained through methods including the Climate Prediction Center's Morphing (CMORPH), Geostationary Operational Environmental Satellite-Based Auto-Estimator (GOES-AE), GOES-Based Hydro-Estimator (GOES-HE) and Self-Calibrating Multivariate Precipitation Retrieval (SCAMPR) algorithms, are used in this study. The merged data are evaluated against the Arkansas Red Basin River Forecast Center's (ABRFC's) ground-based rainfall product. The evaluation is performed using the Heidke skill score (HSS) for four seasons, from summer 2007 to spring 2008, and for two different rainfall detection thresholds. It is shown that the merged data outperform all the other products in seven out of eight cases. A key innovation of this machine learning method is that only 6% of the validation data are used for the initial training. The sensitivity of the algorithm to location, distribution of training data, selection of input data sets and seasons is also analysed and presented.

Turlapaty, Anish C. [Mississippi State University (MSU); Younan, Nicolas H. [Mississippi State University (MSU); Anantharaj, Valentine G [ORNL

2012-01-01T23:59:59.000Z

364

Steady states and linear stability analysis of precipitation pattern formation at geothermal hot springs  

E-Print Network (OSTI)

A dynamical theory of geophysical precipitation pattern formation is presented and applied to irreversible calcium carbonate (travertine) deposition. Specific systems studied here are the terraces and domes observed at geothermal hot springs, such as those at Yellowstone National Park, and speleothems, particularly stalactites and stalagmites. The theory couples the precipitation front dynamics with shallow water flow, including corrections for turbulent drag and curvature effects. In the absence of capillarity and with a laminar flow profile, the theory predicts a one-parameter family of steady state solutions to the moving boundary problem describing the precipitation front. These shapes match well the measured shapes near the vent at the top of observed travertine domes. Closer to the base of the dome, the solutions deviate from observations, and circular symmetry is broken by a fluting pattern, which we show is associated with capillary forces causing thin film break-up. We relate our model to that recently proposed for stalactite growth, and calculate the linear stability spectrum of both travertine domes and stalactites. Lastly, we apply the theory to the problem of precipitation pattern formation arising from turbulent flow down an inclined plane, and identify a linear instability that underlies scale-invariant travertine terrace formation at geothermal hot springs.

Pak Yuen Chan; Nigel Goldenfeld

2007-06-21T23:59:59.000Z

365

Street N.W., Washington, DC 20036 Letter Electrostatic Force Assisted Exfoliation of  

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

LAWRENCE BERKELEY NATL LAB LAWRENCE BERKELEY NATL LAB Nano Letters is published by the American Chemical Society. 1155 Sixteenth Street N.W., Washington, DC 20036 Letter Electrostatic Force Assisted Exfoliation of Prepatterned Few-Layer Graphenes into Device Sites Xiaogan Liang, Allan S. P. Chang, Yuegang Zhang, Bruce D. Harteneck, Hyuck Choo, Deirdre L. Olynick, and Stefano Cabrini Nano Lett., Article ASAP Downloaded from http://pubs.acs.org on December 15, 2008 More About This Article Additional resources and features associated with this article are available within the HTML version: * Supporting Information * Access to high resolution figures * Links to articles and content related to this article * Copyright permission to reproduce figures and/or text from this article Electrostatic

366

Fast Calculations of Electrostatic Solvation Free Energy from Reconstructed Solvent Density Using Proximal Radial Distribution Functions  

SciTech Connect

Although detailed atomic models may be applied for a full description of solvation, simpler phenomenologicalmodels are particularly useful to interpret the results for scanning many large, complex systems, where a full atomic model is too computationally expensive to use. Among the most costly are solvation free-energy evaluations by simulation. Here we develop a fast way to calculate electrostatic solvation free energy while retaining much of the accuracy of explicit solvent free-energy simulation. The basis of our method is to treat the solvent not as a structureless dielectric continuum but as a structured medium by making use of universal proximal radial distribution functions. Using a deca-alanine peptide as a test case, we compare the use of our theory with free-energy simulations and traditional continuum estimates of the electrostatic solvation free energy.

Lin, Bin; Wong, Ka-Yiu; Hu, Char Y.; Kokubo, Hironori; Pettitt, Bernard M.

2011-07-07T23:59:59.000Z

367

Electrostatic beneficiation of coal. Quarterly technical progress report, January 1--March 31, 1996  

SciTech Connect

Two methods of examining the decay rate of charge on powders deposited on the separator plates were examined. In the first method the charge transferred from ground to the separator plate was measured directly with an electrometer after completion of the powder deposition and after turning off the electric field. In a second method an electrostatic field meter (Trek model 354A) was used to measure the field due to the charge on the plates or on thin Teflon or aluminum plates which had been placed over the metal separator plates. In addition the paper discusses the fabrication and use of a resistivity cell for coal powder; charging of small particles by milling; observations with silica gel; and a review of articles on particle charging. A separate section presents the electrostatic charging properties of coal macerals.

Mazumder, M.K.; Lindquist, D.; Tennal, K.B.

1996-04-01T23:59:59.000Z

368

Implosion and explosion of electrostatic cylindrical and spherical shocks in asymmetric pair-ion plasmas  

SciTech Connect

Nonlinear electrostatic shock waves are studied in unmagnetized, dissipative pair-ion plasmas. The dissipation in the system is taken into account by considering the effect of kinematic viscosity of both positive and negative ions in plasmas. The system of fluid equations for asymmetric pair-ion plasma is reduced to Korteweg-deVries-Burgers equation in the limit of small amplitude perturbation. It is observed that the system under consideration admits rarefactive shocks. Keeping in view the practical applications, the nonlinear propagation of both the exploding and imploding shocks is investigated and the differences are expounded in detail. The present study may have relevance in the study of the formation of electrostatic shocks in laser-induced implosion devices, star formation, supernovae explosion, etc.

Masood, W. [Theoretical Plasma Physics Division, PINSTECH, P.O. Nilore, Islamabad 54000 (Pakistan); National Centre for Physics (NCP), Shahdara Valley Road, Islamabad 44000 (Pakistan); Rizvi, H. [Theoretical Plasma Physics Division, PINSTECH, P.O. Nilore, Islamabad 54000 (Pakistan)

2011-04-15T23:59:59.000Z

369

Electrostatic drift-wave instability in a nonuniform quantum magnetoplasma with parallel velocity shear flows  

SciTech Connect

The propagation of high and low frequency (in comparison with the cyclotron frequency) electrostatic drift-waves is investigated in a nonuniform, dense magnetoplasma (composed of electrons and ions), in the presence of parallel shear flow, by employing the quantum magnetohydrodynamic (QMHD) model. Using QMHD model, a new set of equations is presented in order to investigate linear properties of electrostatic drift-waves with sheared plasma flows for dense plasmas. In this regard, dispersion relations for coupled electron-thermal and drift-ion acoustic modes are derived and several interesting limiting cases are discussed. For instance, it is found that sheared ion flow parallel to the external magnetic field can drive the quantum drift-ion acoustic wave unstable, etc. The present investigation may have relevance in dense astrophysical environments where quantum effects are significant.

Tariq, Sabeen; Mirza, Arshad M. [Department of Physics, Theoretical Plasma Physics Group, Quaid-i-Azam University, Islamabad 45320 (Pakistan); Masood, W. [Theoretical Plasma Physics Division, PINSTECH, P.O. Box. Nilore, Islamabad 44000, Pakistan and National Center for Physics (NCP), Islamabad 45320 (Pakistan)

2010-10-15T23:59:59.000Z

370

Intentionally Including - Engaging Minorities in Physics Careers |  

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

Intentionally Including - Engaging Minorities in Physics Careers Intentionally Including - Engaging Minorities in Physics Careers Intentionally Including - Engaging Minorities in Physics Careers April 24, 2013 - 4:37pm Addthis Joining Director Dot Harris (second from left) were Marlene Kaplan, the Deputy Director of Education and director of EPP, National Oceanic and Atmospheric Administration, Claudia Rankins, a Program Officer with the National Science Foundation and Jim Stith, the past Vice-President of the American Institute of Physics Resources. Joining Director Dot Harris (second from left) were Marlene Kaplan, the Deputy Director of Education and director of EPP, National Oceanic and Atmospheric Administration, Claudia Rankins, a Program Officer with the National Science Foundation and Jim Stith, the past Vice-President of the

371

Transmission line including support means with barriers  

DOE Patents (OSTI)

A gas insulated transmission line includes an elongated outer sheath, a plurality of inner conductors disposed within and extending along the outer sheath, and an insulating gas which electrically insulates the inner conductors from the outer sheath. A support insulator insulatably supports the inner conductors within the outer sheath, with the support insulator comprising a main body portion including a plurality of legs extending to the outer sheath, and barrier portions which extend between the legs. The barrier portions have openings therein adjacent the main body portion through which the inner conductors extend.

Cookson, Alan H. (Pittsburgh, PA)

1982-01-01T23:59:59.000Z

372

A study of the measurement of cavitation inception using an electrostatic technique  

SciTech Connect

A new concept for detecting cavitation inception has been studied experimentally. In this exploratory study, cavitation is generated by varying the flow velocity and pressure around a circular cylinder. Cavitation inception has been detected by sensing the natural charges and electrification generated during cavitation. The agreement between visual determination and detection using electrostatic probes was quite good. The background and possible mechanisms are reviewed and discussed.

Yuecan, T. (Science and Technology, Wuhan); Velkoff, M.R.

1984-02-01T23:59:59.000Z

373

Web servers and services for electrostatics calculations with APBS and PDB2PQR  

Science Conference Proceedings (OSTI)

APBS and PDB2PQR are widely utilized free software packages for biomolecular electrostatics calculations. Using the Opal toolkit, we have developed a web services framework for these software packages that enables the use of APBS and PDB2PQR by users who do not have local access to the necessary amount of computational capabilities. This not only increases accessibility of the software to a wider range of scientists, educators, and students but it also increases the availability of electrostatics calculations on portable computing platforms. Users can access this new functionality in two ways. First, an Opal-enabled version of APBS is provided in current distributions, available freely on the web. Second, we have extended the PDB2PQR web server to provide an interface for the setup, execution, and visualization electrostatics potentials as calculated by APBS. This web interface also uses the Opal framework which ensures the scalability needed to support the large APBS user community. Both of these resources are available from the APBS/PDB2PQR website: http://www.poissonboltzmann.org/.

Unni, Samir; Huang, Yong; Hanson, Robert M.; Tobias, Malcolm; Krishnan, Sriram; Li, Wilfred; Nielsen, Jens E.; Baker, Nathan A.

2011-04-02T23:59:59.000Z

374

Electrostatic coalescence of used automotive crankcase oil as an alternative to other separation processes  

E-Print Network (OSTI)

This thesis presents an initial investigation of using electrostatic coalescence as an alternative to conventional separation processes to purify used automotive crankcase oil. Specific emphasis of this study was the feasibility of this approach, verified by separating and analyzing a used oil emulsion. The metal removal efficiency was compared to that of a five day gravity settling. Separation experiments were performed in a 2.26 L coalescer with a flat parallel insulated electrode configuration. The used oil emulsion, composed of used oil, Isopar M, and water (no noticeable phase separation for 12 hours) followed the electrostatic coalescence characteristic of higher applied voltages or frequencies allowing higher feed rates. Metal removal efficiencies for iron, calcium and zinc were 3.57, 47.1, and 46.7 %, respectively, using Nalco 7715 at a peak a.c. voltage of 7 kV/cm and a frequency of 1000 Hz at the maximum rate of coalescence. For gravity settlement, metal removal efficiencies for iron, calcium and zinc were 11.2, 15.6, and 57.1 %, respectively. Considering the residence time of a moderate emulsion feed rate is a fraction of an hour, electrostatic coalescence offers an advantage over gravity settling. Oil phase water content varied between 0.05 and 7.2 wt %.

Dixon, John Leslie

1998-01-01T23:59:59.000Z

375

A variational formulation of electrostatics in a medium with spatially varying dielectric permittivity  

E-Print Network (OSTI)

In biological and synthetic materials, many important processes involve charges that are present in a medium with spatially varying dielectric permittivity. To accurately understand the role of electrostatic interactions in such systems, it is important to take into account the spatial dependence of the permittivity of the medium. However, due to the ensuing theoretical and computational challenges, this inhomogeneous dielectric response of the medium is often ignored or excessively simplified. We develop a variational formulation of electrostatics to accurately investigate systems that exhibit this inhomogeneous dielectric response. Our formulation is based on a true energy functional of the polarization charge density. The defining characteristic of a true energy functional is that at its minimum it evaluates to the actual value of the energy; this is a feature not found in many commonly used electrostatic functionals. We explore in detail the charged systems that exhibit sharp discontinuous change in dielectric permittivity, and we show that for this case our functional reduces to a functional of only the surface polarization charge density. We apply this reduced functional to study model problems for which analytical solutions are well known. We demonstrate, in addition, that the functional has many properties that make it ideal for use in molecular dynamics simulations.

Vikram Jadhao; Francisco J. Solis; Monica Olvera de la Cruz

2013-09-26T23:59:59.000Z

376

DISASTER POLICY Including Extreme Emergent Situations (EES)  

E-Print Network (OSTI)

on the ACGME website with information relating to the ACGME response to the disaster. 3. The University-specific Program Requirements. Defined Responsibilities Following the Declaration of a Disaster or Extreme EmergentPage 123 DISASTER POLICY Including Extreme Emergent Situations (EES) The University of Connecticut

Oliver, Douglas L.

377

Velocity map imaging of ions and electrons using electrostatic lenses: Application in photoelectron and photofragment ion imaging of molecular oxygen  

Science Conference Proceedings (OSTI)

The application of electrostatic lenses is demonstrated to give a substantial improvement of the two-dimensional (2D) ion/electron imaging technique. This combination of ion lens optics and 2D detection makes “velocity map imaging” possible

André T. J. B. Eppink; David H. Parker

1997-01-01T23:59:59.000Z

378

Nanostructured ZnO arrays with self-ZnO layer created using simple electrostatic layer-by-layer assembly  

Science Conference Proceedings (OSTI)

Formation of unique ZnO nanoarrays utilizing photodynamic polymer, surface-relief grating structures, and unique electrostatic layer-by-layer assembly as a simple and economical methodology was demonstrated. Atomic force microscope (AFM), scanning electron ...

PilHo Huh; Seong-Cheol Kim

2012-01-01T23:59:59.000Z

379

Buildings Included on EMS Reports"  

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

Office of Legacy Management Office of Legacy Management Buildings Included on EMS Reports" "Site","Property Name","Property ID","GSF","Incl. in Water Baseline (CY2007)","Water Baseline (sq. ft.)","Water CY2008 (sq. ft.)","Water CY2009 (sq. ft.)","Water Notes","Incl. in Energy Baseline (CY2003)","Energy Baseline (sq. ft.)","CY2008 Energy (sq. ft.)","CY2009 Energy (sq. ft.)","Energy Notes","Included as Existing Building","CY2008 Existing Building (sq. ft.)","Reason for Building Exclusion" "Column Totals",,"Totals",115139,,10579,10579,22512,,,3183365,26374,115374,,,99476 "Durango, CO, Disposal/Processing Site","STORAGE SHED","DUD-BLDG-STORSHED",100,"no",,,,,"no",,,,"OSF","no",,"Less than 5,000 GSF"

380

Power generation method including membrane separation  

SciTech Connect

A method for generating electric power, such as at, or close to, natural gas fields. The method includes conditioning natural gas containing C.sub.3+ hydrocarbons and/or acid gas by means of a membrane separation step. This step creates a leaner, sweeter, drier gas, which is then used as combustion fuel to run a turbine, which is in turn used for power generation.

Lokhandwala, Kaaeid A. (Union City, CA)

2000-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "include electrostatic precipitators" 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

Electric power monthly, September 1990. [Glossary included  

SciTech Connect

The purpose of this report is to provide energy decision makers with accurate and timely information that may be used in forming various perspectives on electric issues. The power plants considered include coal, petroleum, natural gas, hydroelectric, and nuclear power plants. Data are presented for power generation, fuel consumption, fuel receipts and cost, sales of electricity, and unusual occurrences at power plants. Data are compared at the national, Census division, and state levels. 4 figs., 52 tabs. (CK)

1990-12-17T23:59:59.000Z

382

Nuclear reactor shield including magnesium oxide  

DOE Patents (OSTI)

An improvement in nuclear reactor shielding of a type used in reactor applications involving significant amounts of fast neutron flux, the reactor shielding including means providing structural support, neutron moderator material, neutron absorber material and other components as described below, wherein at least a portion of the neutron moderator material is magnesium in the form of magnesium oxide either alone or in combination with other moderator materials such as graphite and iron.

Rouse, Carl A. (Del Mar, CA); Simnad, Massoud T. (La Jolla, CA)

1981-01-01T23:59:59.000Z

383

On an Enhanced PERSIANN-CCS Algorithm for Precipitation Estimation  

SciTech Connect

By employing wavelet and selected features (WSF), median merging (MM), and selected curve-fitting (SCF) techniques, the Precipitation Estimation from Remotely Sensed Imagery using an Artificial Neural Networks Cloud Classification System (PERSIANN-CCS) has been improved. The PERSIANN-CCS methodology includes the following four main steps: 1) segmentation of satellite cloud images into cloud patches, 2) feature extraction, 3) classification of cloud patches, and 4) derivation of the temperature rain-rate (T R) relationship for every cluster. The enhancements help improve step 2 by employing WSF, and step 4 by employing MM and SCF. For the study area herein, the results show that the enhanced methodology improves the equitable threat score (ETS) of the daily and hourly rainfall estimates mostly in the winter and fall. The ETS percentage improvement is about 20% for the daily (10% for hourly) estimates in the winter, 10% for the daily (8% for hourly) estimates in the fall, and at most 5% for the daily estimates in the summer at some rainfall thresholds. In the winter and fall, the area bias is improved almost at all rainfall thresholds for daily and hourly estimates. However, no significant improvement is obtained in the spring, and the area bias in the summer is also greater than that of the implemented PERSIANN-CCS algorithm.

Mahrooghy, Majid [Mississippi State University (MSU); Anantharaj, Valentine G [ORNL; Younan, Nicolas H. [Mississippi State University (MSU); Aanstoos, James [Mississippi State University (MSU); Hsu, Kuo-Lin [University of California, Irvine

2012-01-01T23:59:59.000Z

384

Analyzing ENSO Teleconnections in CMIP Models as a Measure of Model Fidelity in Simulating Precipitation  

Science Conference Proceedings (OSTI)

The accurate representation of precipitation is a recurring issue in climate models. El Niño–Southern Oscillation (ENSO) precipitation teleconnections provide a test bed for comparison of modeled to observed precipitation. The simulation quality ...

Baird Langenbrunner; J. David Neelin

2013-07-01T23:59:59.000Z

385

Impact Of Cumulus Initialization on the Spinup of Precipitation Forecasts in the Tropics  

Science Conference Proceedings (OSTI)

In order to ameliorate the precipitation spinup problem (prediction models’ inability to produce realistic precipitation rates at the beginning of the forecast period), the impact of a tropical initialization procedure on precipitation forecasts ...

Akira Kasahara; Arthur P. Mizzi; Leo J. Donner

1992-07-01T23:59:59.000Z

386

On the Decline of Wintertime Precipitation in the Snowy Mountains of Southeastern Australia  

Science Conference Proceedings (OSTI)

Data from a precipitation gauge network in the Snowy Mountains of southeastern Australia have been analyzed to produce a new climatology of wintertime precipitation and airmass history for the region in the period 1990–2009. Precipitation amounts ...

Thomas H. Chubb; Steven T. Siems; Michael J. Manton

2011-12-01T23:59:59.000Z

387

Mapping Weather-Type Influence on Senegal Precipitation Based on a Spatial–Temporal Statistical Model  

Science Conference Proceedings (OSTI)

Senegal is particularly vulnerable to precipitation variability. To investigate the influence of large-scale circulation on local-scale precipitation, a full spatial–statistical description of precipitation occurrence and amount for Senegal is ...

Henning W. Rust; Mathieu Vrac; Benjamin Sultan; Matthieu Lengaigne

2013-10-01T23:59:59.000Z

388

Mapping Weather-Type Influence on Senegal Precipitation Based on a Spatial-Temporal Statistical Model  

Science Conference Proceedings (OSTI)

Senegal is particularly vulnerable to precipitation variability. To investigate the inuence of large scaled circulation on local scale precipitation, we develop a full spatial statistical description of precipitation occurrence and amount for ...

Henning W. Rust; Mathieu Vrac; Benjamin Sultan; Matthieu Lengaigne

389

A Possible Constraint on Regional Precipitation Intensity Changes under Global Warming  

Science Conference Proceedings (OSTI)

Changes in daily precipitation versus intensity under a global warming scenario in two regional climate simulations of the United States show a well-recognized feature of more intense precipitation. More important, by resolving the precipitation ...

W. J. Gutowski Jr.; E. S. Takle; K. A. Kozak; J. C. Patton; R. W. Arritt; J. H. Christensen

2007-12-01T23:59:59.000Z

390

Evaluation of GSMaP Precipitation Estimates over the Contiguous United States  

Science Conference Proceedings (OSTI)

Precipitation estimates from the Global Satellite Mapping of Precipitation (GSMaP) project are evaluated over the contiguous United States (CONUS) for the period of 2005–06. GSMaP combines precipitation retrievals from the Tropical Rainfall ...

Yudong Tian; Christa D. Peters-Lidard; Robert F. Adler; Takuji Kubota; Tomoo Ushio

2010-04-01T23:59:59.000Z

391

A Model of Intense Downdrafts Driven by the Melting and Evaporation of Precipitation  

Science Conference Proceedings (OSTI)

A ono-dimensioral time-dependent model of a downdraft driven by the melting and evaporation of precipitation and precipitation loading is formulated. Equations for particle melting, particle evaporation, particle concentration, precipitation ...

R. C. Srivastava

1987-07-01T23:59:59.000Z

392

6-Hour to 1-Year Variance of Five Global Precipitation Sets  

Science Conference Proceedings (OSTI)

Three-hourly time series of precipitation from three high-resolution precipitation products [Tropical Rainfall Measuring Mission (TRMM) algorithm 3B-42, the Climate Prediction Center’s morphing method (CMORPH), and the Precipitation Estimation ...

Alex C. Ruane; John O. Roads

2007-08-01T23:59:59.000Z

393

Observed Scaling in Clouds and Precipitation and Scale Incognizance in Regional to Global Atmospheric Models  

Science Conference Proceedings (OSTI)

We use observations of robust scaling behavior in clouds and precipitation to derive constraints on how partitioning of precipitation should change with model resolution. Our analysis indicates that 90–99% of stratiform precipitation should occur ...

Travis A. O’Brien; Fuyu Li; William D. Collins; Sara A. Rauscher; Todd D. Ringler; Mark Taylor; Samson M. Hagos; L. Ruby Leung

394

ARM - Evaluation Product - Quantitative Precipitation Estimates (QPE) from  

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

ProductsQuantitative Precipitation Estimates (QPE) ProductsQuantitative Precipitation Estimates (QPE) from the CSAPR Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Evaluation Product : Quantitative Precipitation Estimates (QPE) from the CSAPR Site(s) SGP TWP General Description Precipitation rates from cloud systems can give a fundamental insight into the processes occurring in-cloud. While rain gauges and disdrometers can give information at a single point, remote sensors such as radars can provide rainfall information over a defined area. The QPE value-added product (VAP) takes the Corrected Moments in Antenna Coordinates VAP and maps the Rain_rate_A field onto a Cartesian grid at the surface. This field is the rain rate as determined using the specific attenuation (A, dBZ/km) due to two-way liquid attenuation after Ryzhkov et

395

Issues Regarding the Assimilation of Cloud and Precipitation Data  

Science Conference Proceedings (OSTI)

The assimilation of observations indicative of quantitative cloud and precipitation characteristics is desirable for improving weather forecasts. For many fundamental reasons, it is a more difficult problem than the assimilation of conventional ...

Ronald M. Errico; Peter Bauer; Jean-François Mahfouf

2007-11-01T23:59:59.000Z

396

Regional Simulation of Summertime Precipitation over the Southwestern United States  

Science Conference Proceedings (OSTI)

Using results taken from a finescale (25 km), regional modeling simulation for the summer of 1999, along with contemporaneous daily surface observations, synoptic variations in summertime precipitation over the southwestern United States are ...

Bruce T. Anderson; John O. Roads

2002-12-01T23:59:59.000Z

397

Precipitation Nowcasting by a Spectral-Based Nonlinear Stochastic Model  

Science Conference Proceedings (OSTI)

A novel rainfall nowcasting method based on the combination of an empirical nonlinear transformation of measured precipitation fields and the stochastic evolution in spectral space of the transformed fields is introduced. The power spectrum and ...

Sabino Metta; Jost von Hardenberg; Luca Ferraris; Nicola Rebora; Antonello Provenzale

2009-10-01T23:59:59.000Z

398

Sea Surface Temperature–Precipitation Relationship in Different Reanalyses  

Science Conference Proceedings (OSTI)

The focus of this investigation is how the relationship at intraseasonal time scales between sea surface temperature and precipitation (SST–P) varies among different reanalyses. The motivation for this work was spurred by a recent report that ...

Arun Kumar; Li Zhang; Wanqiu Wang

2013-03-01T23:59:59.000Z

399

Skill in Precipitation Forecasting in the National Weather Service  

Science Conference Proceedings (OSTI)

All known long-term records of forecasting performance for different types of precipitation forecasts in the National Weather Service were examined for relative skill and secular trends in skill. The largest upward trends were achieved by local ...

Jerome P. Charba; William H. Klein

1980-12-01T23:59:59.000Z

400

Impact of Atmospheric Moisture Storage on Precipitation Recycling  

Science Conference Proceedings (OSTI)

Computations of precipitation recycling using analytical models are generally performed under the assumption of negligible change in moisture storage in the atmospheric column. Because the moisture storage term is nonnegligible at smaller time ...

Francina Dominguez; Praveen Kumar; Xin-Zhong Liang; Mingfang Ting

2006-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "include electrostatic precipitators" 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

A Global View of Large-Scale Precipitation Variability  

Science Conference Proceedings (OSTI)

Observational studies and model experiments make abundantly clear the need for a global perspective in order to understand the nature and causes of persistent regional precipitation anomalies. Rainfall in the deep tropics is particularly ...

Eugene M. Rasmusson; Phillip A. Arkin

1993-08-01T23:59:59.000Z

402

Radar-Observed Characteristics of Precipitating Systems during NAME 2004  

Science Conference Proceedings (OSTI)

A multiradar network, operated in the southern Gulf of California (GoC) region during the 2004 North American Monsoon Experiment, is used to analyze the spatial and temporal variabilities of local precipitation. Based on the initial findings of ...

Timothy J. Lang; David A. Ahijevych; Stephen W. Nesbitt; Richard E. Carbone; Steven A. Rutledge; Robert Cifelli

2007-05-01T23:59:59.000Z

403

The 1993 Midwest Extreme Precipitation in Historical and Probabilistic Perspective  

Science Conference Proceedings (OSTI)

Extreme rainfall amounts that resulted in severe flooding during the spring and summer of 1993 along the Missouri and Mississippi Rivers are examined from a historical and probabilistic viewpoint. Long-term average precipitation amounts and the ...

Nathaniel B. Guttman; J. R. M. Hosking; James R. Wallis

1994-10-01T23:59:59.000Z

404

Precipitation Efficiency of Warm-Season Midwestern Mesoscale Convective Systems  

Science Conference Proceedings (OSTI)

The precipitation efficiencies for mesoscale convective systems (MCS) over the central United States are calculated. During July–September 2000 and June–September 2001, 24 MCS for which sufficient data were available occurred over or near ...

Patrick Market; Stacy Allen; Roderick Scofield; Robert Kuligowski; Arnold Gruber

2003-12-01T23:59:59.000Z

405

Experiments in Temperature and Precipitation Forecasting for Illinois  

Science Conference Proceedings (OSTI)

Six years of daily temperature and precipitation forecasting are studied for Urbana, Illinois. Minimum temperature forecast skills, measured against a climatological control, are 57%, 48%, 34% and 20% for the respective forecast ranges of one, ...

John R. Gyakum

1986-06-01T23:59:59.000Z

406

On the Study of a Probability Distribution for Precipitation Totals  

Science Conference Proceedings (OSTI)

Some of the probability distribution models for precipitation totals and their applications are briefly reviewed. The general properties of a probability distribution model which is a mixture of gamma and Poisson distributions are discussed. A ...

Aydin Öztürk

1981-12-01T23:59:59.000Z

407

Acid Leaching of Nickel Laterites with Jarosite Precipitation  

Science Conference Proceedings (OSTI)

Presentation Title, Acid Leaching of Nickel Laterites with Jarosite Precipitation ... shortly after the development of the jarosite process for iron control in zinc refining. ... The Recycling of Cobalt from Alloy Scrap, Spent Batteries or Catalysts and ...

408

Elevation-Dependent Trends in Precipitation Observed during NAME  

Science Conference Proceedings (OSTI)

Radar data from the 2004 North American Monsoon Experiment (NAME) enhanced observing period were used to investigate diurnal trends and vertical structure of precipitating features relative to local terrain. Two-dimensional composites of ...

Angela K. Rowe; Steven A. Rutledge; Timothy J. Lang; Paul E. Ciesielski; Stephen M. Saleeby

2008-12-01T23:59:59.000Z

409

A Probabilistic Forecast Approach for Daily Precipitation Totals  

Science Conference Proceedings (OSTI)

Commonly, postprocessing techniques are employed to calibrate a model forecast. Here, a probabilistic postprocessor is presented that provides calibrated probability and quantile forecasts of precipitation on the local scale. The forecasts are ...

Petra Friederichs; Andreas Hense

2008-08-01T23:59:59.000Z

410

Climatology of Lake-Effect Precipitation Events over Lake Champlain  

Science Conference Proceedings (OSTI)

This study provides the first long-term climatological analysis of lake-effect precipitation events that developed in relation to a small lake (having a surface area of ?1500 km2). The frequency and environmental conditions favorable for Lake ...

Neil F. Laird; Jared Desrochers; Melissa Payer

2009-02-01T23:59:59.000Z

411

Multiscale Mountain Waves Influencing a Major Orographic Precipitation Event  

Science Conference Proceedings (OSTI)

This study combines high-resolution mesoscale model simulations and comprehensive airborne Doppler radar observations to identify kinematic structures influencing the production and mesoscale distribution of precipitation and microphysical ...

Matthew F. Garvert; Bradley Smull; Cliff Mass

2007-03-01T23:59:59.000Z

412

The Form of Cyclonic Precipitation and Its Thermal Impact  

Science Conference Proceedings (OSTI)

A two-dimensional, parameterized kinematic cloud microphysics model is described and used to simulate the form of cyclonic precipitation and its thermal impact in three idealized situations. The first situation represents a strong, warm, or ...

Stanley David Gedzelman; Robert Arnold

1993-07-01T23:59:59.000Z

413

Assimilation of Satellite Precipitable Water in a Meteorological Forecast Model  

Science Conference Proceedings (OSTI)

The lack of local humidity observations over a large portion of the globe hinders any improvement of humidity forecasting in meteorological models. However, satellite microwave radiometers routinely provide fields of precipitable water content ...

M. A. Filiberti; L. Eymard; B. Urban

1994-03-01T23:59:59.000Z

414

Probabilistic models of maximum precipitation for designing sewerage  

Science Conference Proceedings (OSTI)

Pluviographic measurement results from the IMGW Wroc?aw-Strachowice meteorological station from years 1960-2009 constitute the basis for this paper. While conducting the statistical analysis of precipitation occurrence frequency own criterion of ...

Andrzej Kotowski; Bartosz Ka?mierczak

415

Precipitation Types in the Transition Region of Winter Storms  

Science Conference Proceedings (OSTI)

Winter storms often produce snow, freezing rain, and ice pellets. The characteristics and formation of these forms of precipitation as well as their location within storms are reviewed. Phenomena such as accretion and fog can be related to this ...

Ronald E. Stewart

1992-03-01T23:59:59.000Z

416

Lightning during Two Central U.S. Winter Precipitation Events  

Science Conference Proceedings (OSTI)

Network-detected cloud-to-ground lightning coincident with mainly frozen precipitation (freezing rain, sleet, snow) was studied over the central United States during two outbreaks of arctic air in January 1994. During the first event, the ratio ...

Ronald L. Holle; Andrew I. Watson

1996-12-01T23:59:59.000Z

417

Precipitation and Temperature Forecast Performance at the Weather Prediction Center  

Science Conference Proceedings (OSTI)

The role of the human forecaster in improving upon the accuracy of numerical weather prediction is explored using multi-year verification of human-generated short-range precipitation forecasts and medium-range maximum temperature forecasts from ...

David R. Novak; Christopher Bailey; Keith Brill; Patrick Burke; Wallace Hogsett; Robert Rausch; Michael Schichtel

418

Enhancement of satellite precipitation estimation via unsupervised dimensionality reduction  

SciTech Connect

A methodology to enhance Satellite Precipitation Estimation (SPE) using unsupervised dimensionality reduction (UDR) techniques is developed. This enhanced technique is an extension to the Precipitation Estimation from Remotely Sensed Imagery using an Artificial Neural Network (PERSIANN) and Cloud Classification System (CCS) method (PERSIANN-CCS) enriched using wavelet features combined with dimensionality reduction. Cloud-top brightness temperature measurements from Geostationary Operational Environmental Satellite (GOES-12) are used for precipitation estimation at 4 km 4 km spatial resolutions every 30 min. The study area in the continental United States covers parts of Louisiana, Arkansas, Kansas, Tennessee, Mississippi, and Alabama. Based on quantitative measures, root mean square error (RMSE) and Heidke skill score (HSS), the results show that the UDR techniques can improve the precipitation estimation accuracy. In addition, ICA is shown to have better performance than other UDR techniques; and in some cases, it achieves 10% improvement in the HSS.

Mahrooghy, Majid [Mississippi State University (MSU); Younan, Nicolas H. [Mississippi State University (MSU); Anantharaj, Valentine G [ORNL; Aanstoos, James [Mississippi State University (MSU)

2012-01-01T23:59:59.000Z

419

Correcting Microwave Precipitation Retrievals for near-Surface Evaporation  

E-Print Network (OSTI)

This paper compares two methods for correcting passive or active microwave surface precipitation estimates based on hydrometeors sensed aloft that may evaporate before landing. These corrections were derived using two years ...

Surussavadee, Chinnawat

420

The Isotopic Composition of Precipitation from Two Extratropical Cyclones  

Science Conference Proceedings (OSTI)

Precipitation samples were collected at stations in the Eastern United States for two extratropical cyclones during the Genesis of Atlantic Lows Experiment (GALE) of 1986 and analyzed for their ?18O values. They represent the first synoptic-scale ...

Stanley David Gedzelman; James R. Lawrence

1990-02-01T23:59:59.000Z

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


421

West African Monsoon Intraseasonal Variability: A Precipitable Water Perspective  

Science Conference Proceedings (OSTI)

West African monsoon intraseasonal variability has important implications for food security and drought early warnings. In the present study, intraseasonal variability over the Sahel is assessed from the perspective of precipitable water, as ...

D. Emmanuel Poan; Romain Roehrig; Fleur Couvreux; Jean-Philippe Lafore

2013-04-01T23:59:59.000Z

422

Effects of Coalescence Efficiencies on the Formation of Precipitation  

Science Conference Proceedings (OSTI)

A closed parcel model which simulates condensation, collection and breakup was used to evaluate the effects of recently measured collection efficiencies on precipitation development. Computations were made using theoretical collision efficiencies ...

Harry T. Ochs III; Kenneth V. Beard

1985-07-01T23:59:59.000Z

423

TRMM Radar Observations of Shallow Precipitation over the Tropical Oceans  

Science Conference Proceedings (OSTI)

Observations from the precipitation radar aboard the Tropical Rainfall Measuring Mission satellite provide the first opportunity to map vertical structure properties of rain over the entire Tropics and subtropics. Storm height histograms reveal a ...

David A. Short; Kenji Nakamura

2000-12-01T23:59:59.000Z

424

Automatic Monitoring of the Amount of Deposited Precipitation  

Science Conference Proceedings (OSTI)

An automatic device for measurement of the amount (weight) of deposited precipitation developed at the Institute of Atmospheric Physics, Academy of Sciences of the Czech Republic, is described. Examples of measurements of various types of ...

J. Fišák; J. Chum; J. Vojta; K. Bart??ková

2013-04-01T23:59:59.000Z

425

Empirically Downscaled Multimodel Ensemble Temperature and Precipitation Scenarios for Norway  

Science Conference Proceedings (OSTI)

A number of different global climate model scenarios are used in order to infer local climate scenarios for various locations in Norway. Results from empirically downscaled multimodel ensembles of temperature and precipitation for the period 2000–...

Rasmus E. Benestad

2002-11-01T23:59:59.000Z

426

Adjustment of GCM Precipitation Intensity over the United States  

Science Conference Proceedings (OSTI)

A regression equation is developed to adjust the simulated monthly averaged intensity of hourly precipitation over the continental United States using air temperature at the first model level (about 80 m above ground) simulated by a revised ...

Mingxuan Chen; Xubin Zeng; Robert E. Dickinson

1998-09-01T23:59:59.000Z

427

A Comparison of Total Precipitable Water between Reanalyses and NVAP  

Science Conference Proceedings (OSTI)

This study compares monthly total precipitable water (TPW) from the National Aeronautics and Space Administration (NASA) Water Vapor Project (NVAP) and reanalyses of the National Centers for Environmental Prediction (NCEP) (R-1), NCEP–Department ...

Arief Sudradjat; Ralph R. Ferraro; Michael Fiorino

2005-06-01T23:59:59.000Z

428

Precipitates and Mechanical Properties in Modified 718 Alloys  

Science Conference Proceedings (OSTI)

y '/y ” structure was obtained in one alloy and a compact y '/y ” structure in the ... by the size and spacing of the non-compact y '/y ” precipitates being more ...

429

Simulation of Seasonal Snowcover Based on Air Temperature and Precipitation  

Science Conference Proceedings (OSTI)

A simulation is performed for the time variation in depth of seasonal snow with variable air temperature and precipitation in Japan. Processes of snow densification and snowmelt are considered for snow depth calculation. The using parameters are ...

Hideaki Motoyama

1990-11-01T23:59:59.000Z

430

Multiscale Analysis of the Summertime Precipitation over the Central Andes  

Science Conference Proceedings (OSTI)

Precipitation over the central Andes in South America exhibits a marked annual march, with most of the rainfall concentrated during the austral summer season (December–February), when the atmospheric circulation favors the uplifting of moist air ...

RenéD. Garreaud

1999-05-01T23:59:59.000Z

431

Impact of Urban Effects on Precipitation in High Latitudes  

Science Conference Proceedings (OSTI)

This numerical study examines the impact of urban growth and release of aerosols, moisture, and heat on precipitation for Fairbanks, Alaska, a remote city at high latitude. The remote location allows atmospheric changes to be attributed to the ...

Nicole Mölders; Mark A. Olson

2004-06-01T23:59:59.000Z

432

Probabilistic Predictions of Precipitation Using the ECMWF Ensemble Prediction System  

Science Conference Proceedings (OSTI)

The forecast skill of the European Centre for Medium-Range Weather Forecasts Ensemble Prediction System (EPS) in predicting precipitation probabilities is discussed. Four seasons are analyzed in detail using signal detection theory and ...

R. Buizza; A. Hollingsworth; F. Lalaurette; A. Ghelli

1999-04-01T23:59:59.000Z

433

California Wintertime Precipitation Bias in Regional and Global Climate Models  

Science Conference Proceedings (OSTI)

In this paper, wintertime precipitation from a variety of observational datasets, regional climate models (RCMs), and general circulation models (GCMs) is averaged over the state of California and compared. Several averaging methodologies are ...

Peter Caldwell

2010-10-01T23:59:59.000Z

434

Arctic Precipitation and Evaporation: Model Results and Observational Estimates  

Science Conference Proceedings (OSTI)

Observational estimates of precipitation and evaporation over the Arctic Ocean and its terrestrial watersheds are compared with corresponding values from the climate model simulations of the Atmospheric Model Intercomparison Project (AMIP). ...

John E. Walsh; Vladimir Kattsov; Diane Portis; Valentin Meleshko

1998-01-01T23:59:59.000Z

435

A Bulk Microphysics Parameterization with Multiple Ice Precipitation Categories  

Science Conference Proceedings (OSTI)

A single-moment bulk microphysics scheme with multiple ice precipitation categories is described. It has 2 liquid hydrometeor categories (cloud droplets and rain) and 10 ice categories that are characterized by habit, size, and density—two ice ...

Jerry M. Straka; Edward R. Mansell

2005-04-01T23:59:59.000Z

436

Effects of Vertical Wind Shear on Tropical Cyclone Precipitation  

Science Conference Proceedings (OSTI)

The response of the precipitation field for tropical cyclones in relation to the surrounding environmental vertical wind shear has been investigated using 20 000 snapshots of passive-microwave satellite rain rates. Composites of mean rain rates, ...

Matthew T. Wingo; Daniel J. Cecil

2010-03-01T23:59:59.000Z

437

An Improved Modeling Scheme for Freezing Precipitation Forecasts  

Science Conference Proceedings (OSTI)

To improve forecasts of various weather elements (snow, rain, and freezing precipitation) in numerical weather prediction models, a new mixed-phase cloud scheme has been developed. The scheme is based on a single prognostic equation for total ...

André Tremblay; Anna Glazer

2000-05-01T23:59:59.000Z

438

Soil Moisture Feedbacks to Precipitation in Southern Africa  

Science Conference Proceedings (OSTI)

The effects of increased soil moisture on wet season (October–March) precipitation in southern Africa are investigated using the Community Climate System Model version 3 (CCSM3). In the CTRL case, soil moisture is allowed to interact dynamically ...

Benjamin I. Cook; Gordon B. Bonan; Samuel Levis

2006-09-01T23:59:59.000Z

439

Orographic Precipitation in the Tropics: Experiments in Dominica  

Science Conference Proceedings (OSTI)

The “natural laboratory” of mountainous Dominica (15°N) in the trade wind belt is used to study the physics of tropical orographic precipitation in its purest form, unforced by weather disturbances or by the diurnal cycle of solar heating. A ...

R. B. Smith; P. Schafer; D. J. Kirshbaum; E. Regina

2009-06-01T23:59:59.000Z

440

Regional Extreme Monthly Precipitation Simulated by NARCCAP RCMs  

Science Conference Proceedings (OSTI)

This paper analyzes the ability of the North American Regional Climate Change Assessment Program (NARCCAP) ensemble of regional climate models to simulate extreme monthly precipitation and its supporting circulation for regions of North America, ...

William J. Gutowski Jr.; Raymond W. Arritt; Sho Kawazoe; David M. Flory; Eugene S. Takle; Sébastien Biner; Daniel Caya; Richard G. Jones; René Laprise; L. Ruby Leung; Linda O. Mearns; Wilfran Moufouma-Okia; Ana M. B. Nunes; Yun Qian; John O. Roads; Lisa C. Sloan; Mark A. Snyder

2010-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "include electrostatic precipitators" 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

Parameterizing Subgrid Orographic Precipitation and Surface Cover in Climate Models  

Science Conference Proceedings (OSTI)

Previous development of the Pacific Northwest National Laboratory’s regional climate model has focused on representing orographic precipitation using a subgrid parameterization where subgrid variations of surface elevation are aggregated to a ...

L. R. Leung; S. J. Ghan

1998-12-01T23:59:59.000Z

442

A 3-GHz Profiler for Precipitating Cloud Studies  

Science Conference Proceedings (OSTI)

A 3-GHz profiler has been developed by the National Oceanic and Atmospheric Administration’s Aeronomy Laboratory to observe the evolution and vertical structure of precipitating cloud systems. The profiler is very portable, robust, and relatively ...

Warner L. Ecklund; Christopher R. Williams; Paul E. Johnston; Kenneth S. Gage

1999-03-01T23:59:59.000Z

443

Mesoscale Predictability of an Extreme Warm-Season Precipitation Event  

Science Conference Proceedings (OSTI)

A mesoscale model is used to investigate the mesoscale predictability of an extreme precipitation event over central Texas on 29 June 2002 that lasted through 7 July 2002. Both the intrinsic and practical aspects of warm-season predictability, ...

Fuqing Zhang; Andrew M. Odins; John W. Nielsen-Gammon

2006-04-01T23:59:59.000Z

444

Consensus Clustering of U.S. Temperature and Precipitation Data  

Science Conference Proceedings (OSTI)

A “consensus clustering” strategy is applied to long-term temperature and precipitation time series data for the purpose of delineating climate zones of the conterminous United States in a “data-driven” (as opposed to “rule-driven”) fashion. ...

Robert G. Fovell

1997-06-01T23:59:59.000Z

445

A Low-Precipitation Cumulonimbus along the Dryline in Colorado  

Science Conference Proceedings (OSTI)

An unusual low-precipitation cumulonimbus that developed in northeastern Colorado is photographically documented in some detail. The storm produced at least 12 funnels, mostly at midlevels on the north side of the main updraft. The base of the ...

Eugene W. McCaul Jr.; David O. Blanchard

1990-12-01T23:59:59.000Z

446

BASIC PEROXIDE PRECIPITATION METHOD OF SEPARATING PLUTONIUM FROM CONTAMINANTS  

DOE Patents (OSTI)

A process is described for the separation from each other of uranyl values, tetravalent plutonium values and fission products contained in an aqueous acidic solution. First the pH of the solution is adjusted to between 2.5 and 8 and hydrogen peroxide is then added to the solution causing precipitation of uranium peroxide which carries any plutonium values present, while the fission products remain in solution. Separation of the uranium and plutonium values is then effected by dissolving the peroxide precipitate in an acidic solution and incorporating a second carrier precipitate, selective for plutonium. The plutonium values are thus carried from the solution while the uranium remains flissolved. The second carrier precipitate may be selected from among the group consisting of rare earth fluorides, and oxalates, zirconium phosphate, and bismuth lihosphate.

Seaborg, G.T.; Perlman, I.

1959-02-10T23:59:59.000Z

447

On the “Best” Temperature and Precipitation Normals: The Illinois Situation  

Science Conference Proceedings (OSTI)

Historical (1901–79) temperature and precipitation data for four Illinois stations were used to determine the frequency with which summer and winter averages for periods of various length (i.e., different climatic normals) are closest to the ...

Peter J. Lamb; Stanley A. Changnon Jr.

1981-12-01T23:59:59.000Z

448

Precipitation of heterogeneous nanostructures: Metal nanoparticles and dielectric nanocrystallites  

Science Conference Proceedings (OSTI)

Heterogeneous precipitation of nanocrystallites of metallic Bi and anatase was observed in CaO-Bi{sub 2}O{sub 3}-B{sub 2}O{sub 3}-Al{sub 2}O{sub 3}-TiO{sub 2} glass-ceramics. Addition of AlN reduced the Bi{sub 2}O{sub 3} to Bi metal nanoparticles, which were uniformly dispersed in the glass. After heat-treatment of the Bi-precipitated glass around the glass transition temperature, nanocrystalline anatase precipitated out without aggregation of the Bi metal particles. It was found that the anatase nanocrystal size was affected by the distance between a nanocrystal and a precipitated Bi nanoparticle. The glass-ceramic produced is a functional material containing a random dispersion of different types of nanoparticles with different dielectric constants.

Masai, Hirokazu; Takahashi, Yoshihiro; Fujiwara, Takumi [Department of Applied Physics, Tohoku University, 6-6-05, Aoba, Aoba-ku, Sendai 980-8579 (Japan); Tokuda, Yomei; Yoko, Toshinobu [Institute for Chemical Research, Kyoto University, Gokasyo, Uji, Kyoto 611-0011 (Japan)

2010-07-15T23:59:59.000Z

449

Mechanisms by Which Surface Drying Perturbs Tropical Precipitation Fields  

Science Conference Proceedings (OSTI)

The observed precipitation climatology in austral summer has a pronounced longitudinal gradient across Africa and South America. A low-resolution general circulation model (GCM) with a simple continent centered on the equator is used to ...

Kerry H. Cook

1994-03-01T23:59:59.000Z

450

Spatial Distribution of Precipitation Seasonality in the United States  

Science Conference Proceedings (OSTI)

A detailed, long term portrait of the seasonality of precipitation over the United States is developed using a 90 year climate division record. Selected decadal maps of seasonality are also presented, and their variability over time considered. ...

Peter L. Finkelstein; Lawrence E. Truppi

1991-04-01T23:59:59.000Z

451

Effects of Precipitation on UHF Wind Profiler Measurements  

Science Conference Proceedings (OSTI)

Horizontal winds in the presence of precipitation were measured routinely with a UHF (405 MHz) Wind Profiler. The profiler had five beam-pointing positions so independent measurements of horizontal winds could be compared to determine relative ...

D. B. Wuertz; B. L. Weber; R. G. Strauch; A. S. Frisch; C. G. Little; D. A. Merritt; K. P. Moran; D. C. Welsh

1988-06-01T23:59:59.000Z

452

RESEARCH CAMPAIGN: The Convective and Orographically Induced Precipitation Study  

Science Conference Proceedings (OSTI)

The international field campaign called the Convective and Orographically-induced Precipitation Study (COPS) took place from June to August 2007 in southwestern Germany/eastern France. The overarching goal of COPS is to advance the quality of ...

Volker Wulfmeyer; Andreas Behrendt; Hans-Stefan Bauer; Christoph Kottmeier; Ulrich Corsmeier; Alan Blyth; George Craig; Ulrich Schumann; Martin Hagen; Susanne Crewell; Paolo Di Girolamo; Cyrille Flamant; Mark Miller; Andrea Montani; Stephen Mobbs; Evelyne Richard; Mathias W. Rotach; Marco Arpagaus; Herman Russchenberg; Peter Schlüssel; Marianne König; Volker Gärtner; Reinhold Steinacker; Manfred Dorninger; David D. Turner; Tammy Weckwerth; Andreas Hense; Clemens Simmer

2008-10-01T23:59:59.000Z

453

The WGNE Assessment of Short-term Quantitative Precipitation Forecasts  

Science Conference Proceedings (OSTI)

Twenty-four-hour and 48-h quantitative precipitation forecasts (QPFs) from 11 operational numerical weather prediction models have been verified for a 4-yr period against rain gauge observations over the United States, Germany, and Australia to ...

Elizabeth E. Ebert; Ulrich Damrath; Werner Wergen; Michael E. Baldwin

2003-04-01T23:59:59.000Z

454

Spatial Coherence of Monthly Precipitation in the United States  

Science Conference Proceedings (OSTI)

Factor analysis and an orthogonal rotation to the varimax criterion are used to identify the synoptic-scale regions of the United States over which monthly precipitation amounts show the greatest spatial coherence. The regions are consistent with ...

John E. Walsh; Michael B. Richman; David W. Allen

1982-04-01T23:59:59.000Z

455

Subpolar High Anomaly Preconditioning Precipitation over South America  

Science Conference Proceedings (OSTI)

The mechanisms associated with the intraseasonal variability of precipitation over South America during the spring season are investigated with emphasis on the influence of a quasi-stationary anomalous circulation over the southeastern South ...

Silvina A. Solman; Isidoro Orlanski

2010-05-01T23:59:59.000Z

456

Springtime Precipitation and Water Vapor Flux over Southeastern South America  

Science Conference Proceedings (OSTI)

The physical mechanisms associated with precipitation in southeastern South America during spring are investigated using short-term integrations with the regional mesoscale Eta Model. An evaluation of the model’s performance using in situ ...

Ernesto H. Berbery; Estela A. Collini

2000-05-01T23:59:59.000Z

457

ARM - Field Campaign - Azores: Clouds, Aerosol and Precipitation...  

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

to Clouds, Aerosol and Precipitation in the Marine Boundary Layer (CAP-MBL) 2010.01.01, Wood, AMF Comments? We would love to hear from you Send us a note below or call us at...

458

A Climatological Model for 1-min Precipitation Rates  

Science Conference Proceedings (OSTI)

A model for estimating mean monthly total time occurrence for 1-min precipitation rates from monthly climatological variables has been developed. The model has two components: an estimation algorithm for the mean monthly percentage of time in ...

Paul Tattelman; Kevin P. Larson; Andrew J. Mazzella Jr.

1995-05-01T23:59:59.000Z

459

Cumulative Results of Extended Forecast Experiment. III: Precipitation  

Science Conference Proceedings (OSTI)

A diagnostic analysis and an appraisal of the precipitation calculation by the GFDL (Geophysical Fluid Dynamics Laboratory) 1967 version prediction model are presented, using two-week forecasts of 12 January and 12 July cases. The geographical ...

K. Miyakoda; R. F. Strickler

1981-04-01T23:59:59.000Z

460

Probabilistic Quantitative Precipitation Forecast for Flood Prediction: An Application  

Science Conference Proceedings (OSTI)

This paper outlines a methodology to produce probabilistic quantitative precipitation forecasts by means of a dedicated uncertainty processor for weather model output. The uncertainty processor is developed as a component of a Bayesian ...

P. Reggiani; A. H. Weerts

2008-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "include electrostatic precipitators" 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

A Bayesian Approach to Microwave Precipitation Profile Retrieval  

Science Conference Proceedings (OSTI)

A multichannel passive microwave precipitation retrieval algorithm is developed. Bayes theorem is used to combine statistical information from numerical cloud models with forward radiative transfer modeling. Amultivariate lognormal prior ...

K. Franklin Evans; Joseph Turk; Takmeng Wong; Graeme L. Stephens

1995-01-01T23:59:59.000Z

462

Regional, Very Heavy Daily Precipitation in NARCCAP Simulations  

Science Conference Proceedings (OSTI)

The authors analyze the ability of the North American Regional Climate Change Assessment Program's ensemble of climate models to simulate very heavy daily precipitation and its supporting processes, comparing simulations that used observation-...

Sho Kawazoe; William J. Gutowski Jr.

2013-08-01T23:59:59.000Z

463

Regional, Very Heavy Daily Precipitation in CMIP5 Simulations  

Science Conference Proceedings (OSTI)

The authors analyze the ability of global climate models (GCMs) from phase 5 of the Coupled Model Intercomparison Project (CMIP5) multimodel ensemble to simulate very heavy daily precipitation and its supporting processes, comparing them with ...

Sho Kawazoe; William J. Gutowski Jr.

2013-08-01T23:59:59.000Z

464

Optimized Retrievals of Precipitable Water from the VAS “Split Window”  

Science Conference Proceedings (OSTI)

Precipitable water fields have been retrieved from the VISSR Atmospheric Sounder (VAS) using a radiation transfer model for the differential water vapor absorption between the 11 and 12 ?m “split window” channels. Previous moisture retrievals ...

Dennis Chesters; Wayne D. Robinson; Louis W. Uccellini

1987-08-01T23:59:59.000Z

465

Synoptic Control of Mesoscale Precipitating Systems in the Pacific Northwest  

Science Conference Proceedings (OSTI)

This research examines whether an adequate representation of flow features on the synoptic scale allows for the skillful inference of mesoscale precipitating systems. The focus is on the specific problem of landfalling systems on the west coast ...

Paul J. Roebber; Kyle L. Swanson; Jugal K. Ghorai

2008-09-01T23:59:59.000Z

466

Sources of Sahel Precipitation for Simulated Drought and Rainy Seasons  

Science Conference Proceedings (OSTI)

The sources of sub-Saharan precipitation are studied using diagnostic procedures integrated into the code of the GISS climate model. Water vapor evaporating from defined source region is “tagged,” allowing the determination of the relative ...

Leonard M. Druyan; Randal D. Koster

1989-12-01T23:59:59.000Z

467

Evaluation of Eta–RSM Ensemble Probabilistic Precipitation Forecasts  

Science Conference Proceedings (OSTI)

The accuracy of short-range probabilistic forecasts of quantitative precipitation (PQPF) from the experimental Eta–Regional Spectral Model ensemble is compared with the accuracy of forecasts from the Nested Grid Model’s model output statistics (...

Thomas M. Hamill; Stephen J. Colucci

1998-03-01T23:59:59.000Z

468

Relations between Precipitation and Shallow Groundwater in Illinois  

Science Conference Proceedings (OSTI)

The statistical relationships between monthly precipitation (P) and shallow groundwater levels (GW) in 20 wells scattered across Illinois with data for 1960–84 were defined using autoregressive integrated moving average (ARIMA) modeling. A lag of ...

Stanley A. Changnon; Floyd A. Huff; Chin-Fei Hsu

1988-12-01T23:59:59.000Z

469

Aerosol-Cloud interactions : a new perspective in precipitation enhancement  

E-Print Network (OSTI)

Increased industrialization and human activity modified the atmospheric aerosol composition and size-distribution during the last several decades. This has affected the structure and evolution of clouds, and precipitation ...

Gunturu, Udaya Bhaskar

2010-01-01T23:59:59.000Z

470

A Model for Probability Nowcasts of Accumulated Precipitation Using Radar  

Science Conference Proceedings (OSTI)

A new model for making probability forecasts of accumulated spot precipitation from weather radar data is presented. The model selects a source region upwind of the forecast spot. All pixels (horizontal size 2 × 2 km2) within the source region ...

Tage Andersson; Karl-Ivar Ivarsson

1991-01-01T23:59:59.000Z

471

Uncertainties in Precipitation and Their Impacts on Runoff Estimates  

Science Conference Proceedings (OSTI)

Water balance calculations are becoming increasingly important for earth-system studies. Precipitation is one of the most critical input variables for such calculations because it is the immediate source of water for the land surface hydrological ...

Balázs M. Fekete; Charles J. Vörösmarty; John O. Roads; Cort J. Willmott

2004-01-01T23:59:59.000Z

472

Simulated Convective Lines with Leading Precipitation. Part I: Governing Dynamics  

Science Conference Proceedings (OSTI)

This article, the first of two describing a study in which the authors used idealized numerical simulations to investigate convective lines with leading precipitation, addresses the dynamics governing the systems' structures and individual air ...

Matthew D. Parker; Richard H. Johnson

2004-07-01T23:59:59.000Z

473

Mechanisms of Global Warming Impacts on Regional Tropical Precipitation  

Science Conference Proceedings (OSTI)

Mechanisms that determine the tropical precipitation anomalies under global warming are examined in an intermediate atmospheric model coupled with a simple land surface and a mixed layer ocean. To compensate for the warm tropospheric temperature, ...

Chia Chou; J. David Neelin

2004-07-01T23:59:59.000Z

474

Neural network microwave precipitation retrievals and modeling results  

E-Print Network (OSTI)

We describe a simulation methodology used to develop and validate precipitation retrieval algorithms for current and future passive microwave sounders with emphasis on the NPOESS (National Polar-orbiting Operational ...

Leslie, R. Vincent

475

Propagating Atmospheric Patterns Associated with Midwest Winter Precipitation  

Science Conference Proceedings (OSTI)

For winters over eastern North America, complex Hilbert empirical orthogonal function (HEOF) analysis was used to objectively identify propagating patterns in four atmospheric fields that have potential relevance to precipitation: jet stream–level ...

Courtenay Strong; Jessica Liptak

2012-08-01T23:59:59.000Z

476

A Convective Line with Leading Stratiform Precipitation from BAMEX  

Science Conference Proceedings (OSTI)

On 31 May 2003, a front-fed convective line with leading stratiform precipitation (FFLS) was observed during the Bow Echo and Mesoscale Convective Vortex Experiment (BAMEX). The high-resolution BAMEX measurements provided one of the first ...

Brandon A. Storm; Matthew D. Parker; David P. Jorgensen

2007-05-01T23:59:59.000Z

477

Frequency Modes of Monsoon Precipitation in Arizona and New Mexico  

Science Conference Proceedings (OSTI)

The interannual and intraseasonal variability of the North American monsoon is of great interest because a large proportion of the annual precipitation for Arizona and New Mexico arrives during the summer monsoon. Forty-one years of daily monsoon ...

Anne W. Nolin; Eileen A. Hall-McKim

2006-12-01T23:59:59.000Z

478

Total Precipitable Water Measurements from GOES Sounder Derived Product Imagery  

Science Conference Proceedings (OSTI)

Statistics are compiled comparing calculations of total precipitable water (TPW) as given by GOES sounder derived product imagery (DPI) to that computed from radiosonde data for the 12-month period March 1998–February 1999. In order to ...

John F. Dostalek; Timothy J. Schmit

2001-10-01T23:59:59.000Z

479

Spatiotemporal Variability of Summer Precipitation in Southeastern Arizona  

Science Conference Proceedings (OSTI)

The Walnut Gulch Experimental Watershed (WGEW) in Southeastern Arizona covers ~150 km2 and receives the majority of its annual precipitation from highly variable and intermittent summer storms during the North American monsoon. In this study the ...

Susan Stillman; Xubin Zeng; William J. Shuttleworth; David C. Goodrich; Carl L. Unkrich; Marek Zreda

480

Multiscale Structure and Evolution of an Oklahoma Winter Precipitation Event  

Science Conference Proceedings (OSTI)

A significant winter precipitation event occurred on 8–9 March 1994 in Oklahoma. Snow accumulations greater than 30 cm (12 in.) were measured within a narrow corridor in northern Oklahoma. On the synoptic scale and mesoscale, a correspondence ...

R. Jeffrey Trapp; David M. Schultz; Alexander V. Ryzhkov; Ronald L. Holle

2001-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "include electrostatic precipitators" 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

Thermovoltaic semiconductor device including a plasma filter  

DOE Patents (OSTI)

A thermovoltaic energy conversion device and related method for converting thermal energy into an electrical potential. An interference filter is provided on a semiconductor thermovoltaic cell to pre-filter black body radiation. The semiconductor thermovoltaic cell includes a P/N junction supported on a substrate which converts incident thermal energy below the semiconductor junction band gap into electrical potential. The semiconductor substrate is doped to provide a plasma filter which reflects back energy having a wavelength which is above the band gap and which is ineffectively filtered by the interference filter, through the P/N junction to the source of radiation thereby avoiding parasitic absorption of the unusable portion of the thermal radiation energy.

Baldasaro, Paul F. (Clifton Park, NY)

1999-01-01T23:59:59.000Z

482

Evaluation of Co-precipitation Processes for the Synthesis of Mixed-Oxide Fuel Feedstock Materials  

SciTech Connect

The focus of this report is the evaluation of various co-precipitation processes for use in the synthesis of mixed oxide feedstock powders for the Ceramic Fuels Technology Area within the Fuels Cycle R&D (FCR&D) Program's Advanced Fuels Campaign. The evaluation will include a comparison with standard mechanical mixing of dry powders and as well as other co-conversion methods. The end result will be the down selection of a preferred sequence of co-precipitation process for the preparation of nuclear fuel feedstock materials to be used for comparison with other feedstock preparation methods. A review of the literature was done to identify potential nitrate-to-oxide co-conversion processes which have been applied to mixtures of uranium and plutonium to achieve recycle fuel homogeneity. Recent studies have begun to study the options for co-converting all of the plutonium and neptunium recovered from used nuclear fuels, together with appropriate portions of recovered uranium to produce the desired mixed oxide recycle fuel. The addition of recycled uranium will help reduce the safeguard attractiveness level and improve proliferation resistance of the recycled fuel. The inclusion of neptunium is primarily driven by its chemical similarity to plutonium, thus enabling a simple quick path to recycle. For recycle fuel to thermal-spectrum light water reactors (LWRs), the uranium concentration can be {approx}90% (wt.), and for fast spectrum reactors, the uranium concentration can typically exceed 70% (wt.). However, some of the co-conversion/recycle fuel fabrication processes being developed utilize a two-step process to reach the desired uranium concentration. In these processes, a 50-50 'master-mix' MOX powder is produced by the co-conversion process, and the uranium concentration is adjusted to the desired level for MOX fuel recycle by powder blending (milling) the 'master-mix' with depleted uranium oxide. In general, parameters that must be controlled for co-precipitation processes include (1) feed solution concentration adjustment, (2) precipitant concentration and addition methods, (3) pH, temperature, mixing method and time, (4) valence adjustment, (5) solid precipitate separation from the filtrate 'mother liquor,' generally by means of centrifugation or filtration, and (6) temperatures and times for drying, calcination, and reduction of the MOX product powder. Also a recovery step is necessary because of low, but finite solubility of the U/TRU metals in the mother liquor. The recovery step usually involves destruction of the residual precipitant and disposal of by-product wastes. Direct denitrations of U/TRU require fewer steps, but must utilize various methods to enable production of MOX with product characteristics that are acceptable for recycle fuel fabrication. The three co-precipitation processes considered for evaluation are (1) the ammonia co-precipitation process being developed in Russia, (2) the oxalate co-precipitation process, being developed in France, and (3) the ammonium-uranyl-plutonyl-carbonate (AUPuC) process being developed in Germany. Two direct denitration processes are presented for comparison: (1) the 'Microwave Heating (MH)' automated multi-batch process developed in Japan and (2) the 'Modified Direct Denitration (MDD)' continuous process being developed in the USA. Brief comparative descriptions of the U/TRU co-conversion processes are described. More complete details are provided in the references.

Collins, Emory D [ORNL; Voit, Stewart L [ORNL; Vedder, Raymond James [ORNL

2011-06-01T23:59:59.000Z

483

Effect of Ni on Cu precipitation kinetics in \\alpha-Fe by AKMC study  

E-Print Network (OSTI)

The kinetics of coherent Cu rich precipitation in Fe-Cu and Fe-Cu-Ni alloys during thermal ageing have been modeled by Atomic Kinetic Monte Carlo method (AKMC). The AKMC is parameterized by existing ab-inito data to treat vacancy mediated diffusion which is depend on local atomic environment. A nonlinear semi-empirical time adjusting method is proposed to rescaled the MC time. The combined AKMC and time adjusting method give good agreement with experiments and other simulations, including advancement factor and the Cu cluster mobility. Simulations of ternary alloys reveal Ni has a temporal delay effect on Cu precipitation. This effect is caused by the decreasing diffusion coefficient of Cu clusters. And the reduction effect of diffusion coefficient weakens with cluster size. The simulations can be used to explain the experimental phenomenon that higher cluster number density formed during coasening stage in Fe-Cu-Ni alloys than corresponding binary alloy, which is related to cluster mobility.

Wang, Yi; Liu, Xiang Bing; Wang, Rong Shan; Wang, Jing Tao

2013-01-01T23:59:59.000Z

484

PHOSPHATE MANAGEMENT: FY2010 RESULTS OF PHOSPHATE PRECIPITATION TESTS  

SciTech Connect

The Phosphate Management program seeks to develop treatment options for caustic phosphate solutions resulting from the caustic leaching of the bismuth phosphate sludge. The SRNL subtask investigated the precipitation of phosphate salts from caustic solutions through addition of fluoride and by crystallization. The scoping tests examined the: precipitation of phosphate by the addition of sodium fluoride to form the sodium fluorophosphate double salt, Na{sub 7}F(PO{sub 4}){sub 2} {center_dot} 19H{sub 2}O, crystallization of phosphate by reducing the temperature of saturated phosphate solutions, and combinations of precipitation and crystallization. A simplified leachate simulant was used in the study produced by dissolving sodium phosphate in 1 M to 3.5 M sodium hydroxide solutions. The results show that all three processes; precipitation with sodium fluoride, crystallization, and combined precipitation/crystallization can be effective for removing large amounts of phosphate from solution. The combined process of precipitation/crystallization showed >90% removal of phosphate at all hydroxide concentrations when cooling a non-saturated phosphate solution from 65 C to 25 C. Based on the measured solubility of sodium phosphate, pH adjustment/caustic addition will also remove large amounts of phosphate from solution (>80%). For all three processes, the phosphate concentration in the caustic solution must be managed to keep the phosphate from becoming too concentrated and thereby potentially forming a solid mass of sodium phosphate after an effective phosphate removal process.

Hay, M.; King, W.

2011-04-04T23:59:59.000Z

485

Preferential orientation of Te precipitates in melt-grown CZT  

Science Conference Proceedings (OSTI)

Cadmium zinc telluride (Cd1-xZnxTe or CZT) has proved to be a useful material for semiconductor gamma-ray spectrometers and other electro-optic devices. It is often grown Te-rich to optimize its electrical characteristics, but this off-stoichiometric growth leads to the formation of semimetallic Te precipitates in the semiconducting host crystal. These precipitates can impair device performance and their formation needs to be inhibited, if possible, during growth. Characterization of melt-grown CZT has shown that Te precipitates are often faceted. In this study, characterization of several particles of different shapes revealed that most of the Te precipitates were preferentially oriented with the {101}CZT||{-12-10}Te . A secondary orientation relationship was also observed as {11-1}CZT||{01-11}Te for one of the {111}CZT family of planes. One of the particles exhibited {110}CZT||{01-10}Te and {001}CZT||{0001}Te . Precipitates were often found on {111}CZT twin boundaries and, in these cases, it was possible to assign specific orientations with respect to the twin plane. The expected orientation of the {0001}-plane of Te aligned with the {111}-plane of CZT was not observed even though a good lattice match is predicted in ab initio models. Observations of strained and polycrystalline Te precipitates are also discussed with relevance to the ab initio model and to impacts on electronic properties.

Henager, Charles H.; Edwards, Danny J.; Schemer-Kohrn, Alan L.; Bliss, Mary; Jaffe, John E.

2009-05-18T23:59:59.000Z

486

The Key Role of Heavy Precipitation Events in Climate Model Disagreements of Future Annual Precipitation Changes in California  

Science Conference Proceedings (OSTI)

Climate model simulations disagree on whether future precipitation will increase or decrease over California, which has impeded efforts to anticipate and adapt to human-induced climate change. This disagreement is explored in terms of daily ...

David W. Pierce; Daniel R. Cayan; Tapash Das; Edwin P. Maurer; Norman L. Miller; Yan Bao; M. Kanamitsu; Kei Yoshimura; Mark A. Snyder; Lisa C. Sloan; Guido Franco; Mary Tyree

2013-08-01T23:59:59.000Z

487

Improvement of Typhoon Precipitation Forecast Efficiency by Coupling SSM/I Microwave Data with Climatologic Characteristics and Precipitation  

Science Conference Proceedings (OSTI)

Prediction of flash floods in an accurate and timely fashion is one of the most important challenges in weather prediction. This study aims to address the rainfall prediction problem for quantitative precipitation forecasts over land during ...

Chih-Chiang Wei

2013-06-01T23:59:59.000Z

488

Models of Procyon A including seismic constraints  

E-Print Network (OSTI)

Detailed models of Procyon A based on new asteroseismic measurements by Eggenberger et al (2004) have been computed using the Geneva evolution code including shellular rotation and atomic diffusion. By combining all non-asteroseismic observables now available for Procyon A with these seismological data, we find that the observed mean large spacing of 55.5 +- 0.5 uHz favours a mass of 1.497 M_sol for Procyon A. We also determine the following global parameters of Procyon A: an age of t=1.72 +- 0.30 Gyr, an initial helium mass fraction Y_i=0.290 +- 0.010, a nearly solar initial metallicity (Z/X)_i=0.0234 +- 0.0015 and a mixing-length parameter alpha=1.75 +- 0.40. Moreover, we show that the effects of rotation on the inner structure of the star may be revealed by asteroseismic observations if frequencies can be determined with a high precision. Existing seismological data of Procyon A are unfortunately not accurate enough to really test these differences in the input physics of our models.

P. Eggenberger; F. Carrier; F. Bouchy

2005-01-14T23:59:59.000Z

489

Threshold conditions for lasing of a free electron laser oscillator with longitudinal electrostatic wiggler  

Science Conference Proceedings (OSTI)

The system of the nonlinear non-stationary equations describing spatial-temporal dynamics of the amplitudes of an ondulator radiation and a space-charge wave of a relativistic electron beam in the resonator is obtained. A free electron laser resonator with longitudinal electrostatic wiggler is considered. In the linear approximation, the threshold conditions of lasing for Raman and Compton regimes under excitation of forward and backward electromagnetic wave are achieved. In the various physical situations, the variation of the minimum length of the resonator with the amplitude of wiggler, density of electron beam, and with the reflection coefficients of resonator's mirrors is investigated.

Sepehri Javan, N. [Department of Physics, Faculty of Sciences, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, 56199-11367 (Iran, Islamic Republic of)

2012-12-15T23:59:59.000Z

490

Low frequency electrostatic and electromagnetic modes of ultracold magnetized nonuniform dense plasmas  

SciTech Connect

A coupled linear dispersion relation for the basic electrostatic and electromagnetic waves in the ultracold nonuniform magnetized dense plasmas has been obtained which interestingly is analogous to the classical case. The scales of macroscopic phenomena and the interparticle quantum interactions are discussed. It is important to point out that hydrodynamic models cannot take into account strong quantum effects and they are not applicable to very dense plasmas. The analysis is presented with applications to dense plasmas which are relevant to both laboratory and astrophysical environments.

Saleem, H. [National Centre for Physics (NCP), Quaid-i-Azam University Campus, Islamabad (Pakistan); Department of Physics, COMSATS Institute of Information Technology (CIIT), Islamabad (Pakistan); Ahmad, Ali [Department of Physics, COMSATS Institute of Information Technology (CIIT), Islamabad (Pakistan); Theoretical Plasma Physics Division, Pakistan Institute of Nuclear Science and Technology (PINSTECH), Islamabad (Pakistan); Khan, S. A. [National Centre for Physics (NCP), Quaid-i-Azam University Campus, Islamabad (Pakistan); Department of Physics, COMSATS Institute of Information Technology (CIIT), Islamabad (Pakistan); Department of Physics, Government College Bagh AJK (Pakistan)

2008-09-15T23:59:59.000Z

491

Modelling Precipitation of Carbides in Martensitic Steels  

E-Print Network (OSTI)

-composition IG Intergranular fracture MVC Microvoid coalescence rupture MTDATA Metallurgical and Thermochemical Databank PC Pre-stressed concrete QC Quasi-cleavage fracture SSCC Sulfide stress corrosion cracking TEM Transmission electron microscope TMCP... in high tensile strength steel. 11 1.4 Hydrogen embrittlement 1.4.3 Fracture modes The fracture modes of hydrogen embrittlement include microvoid coalescence (MVC), quasi-cleavage fracture (QC) and intergranular fracture (IG) [48]. The QC mode...

Yamasaki, Shingo

492

The Effects of Aerosols on Intense Convective Precipitation in the Northeastern U.S.  

SciTech Connect

A fully coupled meteorology-chemistry-aerosol mesoscale model (WRF-Chem) is used to assess the effects of aerosols on intense convective precipitation over the northeastern United States. Numerical experiments are performed for three intense convective storm days and for two scenarios representing “typical” and “low” aerosol conditions. The results of the simulations suggest that increasing concentrations of aerosols can lead to either enhancement or suppression of precipitation. Quantification of the aerosol effect is sensitive to the metric used due to a shift of rainfall accumulation distribution when realistic aerosol concentrations are included in the simulations. Maximum rainfall accumulation amounts and areas with rainfall accumulations exceeding specified thresholds provide robust metrics of the aerosol effect on convective precipitation. Storms developing over areas with medium to low aerosol concentrations showed a suppression effect on rainfall independent of the meteorologic environment. Storms developing in areas of relatively high particulate concentrations showed enhancement of rainfall when there were simultaneous high values of CAPE, relative humidity and wind shear. In these cases, elevated aerosol concentrations resulted in stronger updrafts and downdrafts and more coherent organization of convection. For the extreme case, maximum rainfall accumulation differences exceeded 40 mm. The modeling results suggest that areas of the northeastern U.S. urban corridor that are close or downwind of intense sources of aerosols, could be more favorable for rainfall enhancement due to aerosols for the aerosol concentrations typical of this area.

Ntelekos, Alexandros A.; Smith, James S.; Donner, Leo J.; Fast, Jerome D.; Gustafson, William I.; Chapman, Elaine G.; Krajewski, Witold F.

2009-08-03T23:59:59.000Z

493

Outer zone electron precipitation produced by a VLF transmitter  

SciTech Connect

By means of high-resolution pitch angle measurements made by a magnetic-focusing electron spectrometer on the S3-3 satellite while in the drift loss cone region of the magnetosphere, characteristics of fluxes of 108- to 654-keV electron precipitated in the inner zone, in the slot region, and in the outer zone of the magnetosphere are all shown to be consistent with the precipitation's having been produced by the same ground-based VLF transmitter, UMS. Pitch angle measurements are used to locate the longitude of precipitation. The temporal pattern of transmitter operation obtained from synoptic data from a ground-based VLF receiver is used along with drift rate calculations to predict the electron energies as a function of L shell which should be observable by the S3-3 instrument. The predicted energy response is then compared with the in situ observations, getting complete agreement. Finally, wave-particle resonance calculations are made for each of the three regions. The study indicates that ground-based VLF transmitters, which have previously been shown to produce precipitation in the inner zone and slot regions, are almost certainly instrumental in precipitating electrons in the outer zone also. copyright American Geophysical Union 1988

Vampola, A.L.; Adams, C.D.

1988-03-01T23:59:59.000Z

494

Annual grassland resource pools and fluxes: sensitivity to precipitation  

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

Annual grassland resource pools and fluxes: sensitivity to precipitation Annual grassland resource pools and fluxes: sensitivity to precipitation and dry periods on two contrasting soils Title Annual grassland resource pools and fluxes: sensitivity to precipitation and dry periods on two contrasting soils Publication Type Journal Article Year of Publication 2012 Authors Sudderth, Erika A., Samuel B. St. Clair, Sarah A. Placella, Stéphanie M. Swarbreck, Cristina Castanha, Donald J. Herman, Marc L. Fischer, Markus Kleber, Erik B. Sudderth, Margaret S. Torn, Mary K. Firestone, Gary L. Andersen, and David D. Ackerly Journal Ecosphere Volume 3 Issue 8 Keywords Avena barbata, Bayesian ANOVA, carbon, climate change, dry periods, Grassland, nitrogen, phenology, precipitation, soil type, water Abstract In ecosystems throughout the world climate models project increased variability in precipitation patterns that may strongly affect the above- and below-ground processes that control carbon, water, and nutrient cycles. Uncertainty about how plant and soil processes respond to wet and dry periods at different times in the growing season is a barrier to understanding how changing rainfall patterns will affect ecosystem function in annual grasslands. We used mesocosm systems to test the sensitivity to mid- and late-season dry periods of twenty response variables related to nitrogen, carbon, and water cycling in Avena barbata monocultures. We compared the responses of individual variables and of grassland systems under low and high cumulative rain treatments and between two contrasting soil types.

495

Interrelationship of the process and electrostatic parameters of a fluidized bed  

Science Conference Proceedings (OSTI)

The effect of filtration rate on the distribution of potential and field strength in the fluidized bed apparatus was studied, and of its interrelationship with the fluidized bed (FB) electrostatic parameters, taking its pulsation into account. With increasing fluidization number the bed became nonuniform, and the constant-density zone decreased due to the increase of the blowout zone. With further increase of filtration rate the constant - density zone practically disappeared, and the concentration of particles along the FB height decreased exponentially. There existed a linear or close to linear depencence of the potential on the rate of air filtration. The computation program and the construction of the curves of FB apparatus field were carried out with Fortran. With increasing filtration rate, the fields strength increased. The electrification of the dispersed material was intimately related to the hydrodynamic conditions in the FB, since the latter determine the frequency, rate, and duration of contact of interparticle collisions. The hydrodynamic nonuniformity of the FB caused a significant deviation of the electrostatic parameters from their average values. Also the dependence of the relative potential pulses ..delta.. anti phi/anti phi , along the height of a FB apparatus on the fluidization operating conditions were also presented. 4 figures. (DP)

Shikhov, V.N.; Linetskaya, F.E.

1983-04-01T23:59:59.000Z

496

Large Precipitate Hydrolysis Aqueous (PHA) Heel Process Development for the Defense Waste Processing Facility (DWPF)  

DOE Green Energy (OSTI)

A modification to the Precipitate Hydrolysis flowsheet used in DWPF Waste Qualification Runs has been developed.

Lambert, D.P. [Westinghouse Savannah River Company, AIKEN, SC (United States); Boley, C.S.; Jacobs, R.A.

1998-06-04T23:59:59.000Z

497

Symmetry effects in electrostatic interactions between two arbitrarily charged spherical shells in the Debye-Hückel approximation  

E-Print Network (OSTI)

Inhomogeneous charge distributions have important repercussions on electrostatic interactions in systems of charged particles but are often difficult to examine theoretically. We investigate how electrostatic interactions are influenced by patchy charge distributions exhibiting certain point group symmetries. We derive a general form of the electrostatic interaction energy of two permeable, arbitrarily charged spherical shells in the Debye-H\\"uckel approximation and apply it to the case of particles with icosahedral, octahedral, and tetrahedral inhomogeneous charge distributions. We analyze in detail how charge distribution symmetry modifies the interaction energy and find that local charge inhomogeneities reduce the repulsion of two overall equally charged particles, while sufficient orientational variation in the charge distribution can turn the minimum interaction energy into an attraction. Additionally we show that larger patches and thus lower symmetries and wave numbers result in bigger attraction given the same variation.

Anze Losdorfer Bozic; Rudolf Podgornik

2012-11-22T23:59:59.000Z

498

Cloud and Precipitation Fields Around Darwin in the Transition Season  

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

and Precipitation Fields Around Darwin and Precipitation Fields Around Darwin in the Transition Season P. T. May Bureau of Meteorology Research Centre Melbourne, 3001, Victoria, Australia Introduction An interesting, and very relevant question, for the Atmospheric Radiation Measurement (ARM) Program is how cloud characteristics and their seasonal and diurnal variation changes across the tropics. In particular, how does he cloud field around the new SRCS site compare with nearby regions. Thus, the aim of this study is to look at the characteristics of clouds and precipitation in the area around Darwin and to compare the cloud statistics estimated from geostationary meteorological satellite (GMS) satellite data with other nearby regions. Towards this end, GMS satellite imagery and radar data from

499

Anion Pathway and Potential Energy Profiles along Curvilinear Bacterial ClC Cl 2 Pores: Electrostatic Effects of Charged Residues  

E-Print Network (OSTI)

ABSTRACT X-ray structures permit theoretical study of Cl ÿ permeation along bacterial ClC Cl ÿ pores. We determined the lowest energy curvilinear pathway, identified anion-coordinating amino acids, and calculated the electrostatic potential energy profiles. We find that all four bacterial ClC Cl ÿ crystal structures correspond to closed states. E148 and S107 side chains form steric barriers on both sides of the crystal binding site in the StClC wild-type and EcClC wild-type crystals; both the EcClC(E148A) and EcClC(E148Q) mutants are blocked at the S107 site. We studied the effect that mutating the charge of some strongly conserved pore-lining amino acids has on the electrostatic potential energy profiles. When E148 is neutralized, it creates an electrostatic trap, binding the ion near midmembrane. This suggests a possible electrostatic mechanism for controlling anion flow: neutralize E148, displace the side chain of E148 from the pore pathway to relieve the steric barrier, then trap the anion at midmembrane, and finally either deprotonate E148 and block the pore (pore closure) or bring a second Cl ÿ into the pore to promote anion flow (pore conductance). Side-chain displacement may arise by competition for the binding site between the oxygens of E148 and the anion moving down the electrostatic energy gradient. We also find that the charge state of E111 and E113 may electrostatically control anion conductance and occupancy of the binding site within the cytoplasmic pore.

Gennady V. Miloshevsky; Peter C. Jordan

2004-01-01T23:59:59.000Z

500

Nano {gamma}'/{gamma}'' composite precipitates in Alloy 718  

Science Conference Proceedings (OSTI)

Nanoscale composite precipitates of Alloy 718 have been investigated with both high-resolution scanning transmission electron microscopy and phase field modeling. Chemical analysis via energy-dispersive x-ray spectroscopy allowed for the differentiation of {gamma}' and {gamma}'' particles, which is not otherwise possible through traditional Z-contrast methods. Phase field modeling was applied to determine the stress distribution and elastic interaction around and between the particles, respectively, and it was determined that a composite particle (of both {gamma}' and {gamma}'') has an elastic energy that is significantly lower than, for example, single {gamma}' and {gamma}'' precipitates which are non-interacting.

Phillips, P. J. [Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607 (United States); McAllister, D.; Gao, Y.; Lv, D.; Williams, R. E. A.; Wang, Y.; Mills, M. J. [Department of Materials Science and Engineering, Ohio State University, Columbus, Ohio 43210 (United States); Peterson, B. [Honeywell Aerospace, Phoenix, Arizona 85034 (United States)

2012-05-21T23:59:59.000Z