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Note: This page contains sample records for the topic "active closed loop" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
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1

Research issues on closed-loop PLM  

Science Conference Proceedings (OSTI)

This study introduces the research issues on closed-loop product lifecycle management (PLM) where product information flow is closed due to emerging technologies. PLM is a new strategic approach to manage the product lifecycle information efficiently ... Keywords: PLM, Product identification technologies, Product lifecycle, Research issues

Hong-Bae Jun; Dimitris Kiritsis; Paul Xirouchakis

2007-12-01T23:59:59.000Z

2

Cascading Closed Loop Cycle Power Generation  

E-Print Network (OSTI)

WOW Energies was issued Patent 6,857,268 B2 on Feb 22, 2005 titled “CASCADING CLOSED LOOP CYCLE (CCLC) and Patent 7,096,665 B2 on August 29, 2006 titled “CASCADING CLOSED LOOP CYCLE POWER GENERATION”. These patented technologies are collectively marketed as WOWGen®. The WOW Energies patents represent the production of efficient power from low, medium and high temperature heat generated from the combustion of fuels; heat from renewable energy sources such as solar and geothermal heat; or waste heat sources. Waste heat sources can be in the form of exhaust stack flue gases; waste heat from vented steam or steam discharged from steam turbines; hot water; hot oils or combined waste heat sources. A major advantage of the WOWGen® power plant is the ability to produce power without the use, consumption or contamination of valuable water resources. Production of power from waste heat and renewable energy sources is the most viable path to energy independence from foreign oil and reduced emissions from the combustion of fossil fuels. The WOWGen® power plant inherently reduces emissions and Greenhouse Gases (GHG) by producing power from waste heat without consuming fuel, thus increasing the overall energy efficiency of any industrial plant or power generation facility. The presentation will focus on the technology and provide case studies of its application.

Romero, M.

2008-01-01T23:59:59.000Z

3

The HTGR Closed - Loop Energy System  

E-Print Network (OSTI)

This paper summarizes some of the studies performed during the past several years on the application of the high temperature gas-cooled reactor (HTGR) to the U.S. industrial energy market. The specific concept utilizes a closed-loop thermo chemical pipe (TCP), combined with the HTGR to serve dispersed industrial heat and electrical loads. Heat in various forms can be supplied at temperatures up to about 1700 F. The system substitutes nuclear energy for fluid fuels, conserves energy compared to many alternatives, and features zero emissions at the user site. Potential U.S. market size for the HTGR/TCP system appears to be approximately 8 quads per year (300 GWT to 400 GWT) in the 2000 to 2020 time period. The current U.S. HTGR development program is focused on industrial heat applications.

Leeth, G. G.

1981-01-01T23:59:59.000Z

4

Open versus closed loop capacity equilibria in electricity markets ...  

E-Print Network (OSTI)

May 7, 2012 ... Open versus closed loop capacity equilibria in electricity markets under ... We also present and analyze alternative conjectured price response ...

5

Integrated Framework toward a Closed Loop Measurement and Verification  

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

Integrated Framework toward a Closed Loop Measurement and Verification Integrated Framework toward a Closed Loop Measurement and Verification Approach Title Integrated Framework toward a Closed Loop Measurement and Verification Approach Publication Type Conference Proceedings Year of Publication 2011 Authors Earni, Shankar, Philip Coleman, and Mark D. Sanders Conference Name ACEEE Summer Study on Energy Efficiency in Industry Volume 1 Pagination 68-79 Date Published 1/2011 Abstract This study reviews a sample set of measurement and verification (M&V) plans from federal ESPC projects to understand and assess the overall status of M&V practices. The review identifies some of the key issues that need to be addressed to improve the rigor and transparency of M&V practices. To mitigate some of the identified M&V issues, this work also reviews existing M&V protocols, guidelines and other pertinent literature to identify strategies that can augment traditional M&V approaches. The authors provide a framework to identify ways to integrate M&V and commissioning activities into the ESPC process, combining M&V activities and advanced meter data into a monitoring-based commissioning approach that reduces the uncertainty of savings while ensuring their persistence.

6

Direct-contact closed-loop heat exchanger  

DOE Patents (OSTI)

A high temperature heat exchanger with a closed loop and a heat transfer liquid within the loop, the closed loop having a first horizontal channel with inlet and outlet means for providing direct contact of a first fluid at a first temperature with the heat transfer liquid, a second horizontal channel with inlet and outlet means for providing direct contact of a second fluid at a second temperature with the heat transfer liquid, and means for circulating the heat transfer liquid.

Berry, Gregory F. (Naperville, IL); Minkov, Vladimir (Skokie, IL); Petrick, Michael (Joliet, IL)

1984-01-01T23:59:59.000Z

7

Direct-contact closed-loop heat exchanger  

DOE Patents (OSTI)

A high temperature heat exchanger is disclosed which has a closed loop and a heat transfer liquid within the loop, the closed loop having a first horizontal channel with inlet and outlet means for providing direct contact of a first fluid at a first temperature with the heat transfer liquid, a second horizontal channel with inlet and outlet means for providing direct contact of a second fluid at a second temperature with the heat transfer liquid, and means for circulating the heat transfer liquid.

Berry, G.F.; Minkov, V.; Petrick, M.

1981-11-02T23:59:59.000Z

8

On-line parameter estimation of PMSM in open loop and closed loop  

Science Conference Proceedings (OSTI)

The paper discusses the multi-models approach for on-line parameter estimation of permanent magnet synchronous motor (PMSM). The study is focused on a PMSM with non sinusoidal electromotive force (emf) in open loop and closed loop conditions. The electrical ...

Makara Khov; Jeremi Regnier; Jean Faucher

2009-02-01T23:59:59.000Z

9

Energy Savings Calculator for Commercial Boilers: Closed Loop, Space  

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

Savings Calculator for Commercial Boilers: Closed Loop, Savings Calculator for Commercial Boilers: Closed Loop, Space Heating Applications Only Energy Savings Calculator for Commercial Boilers: Closed Loop, Space Heating Applications Only October 8, 2013 - 2:23pm Addthis This cost calculator is a screening tool that estimates a product's lifetime energy cost savings at various efficiency levels. Learn more about the base model and other assumptions. Project Type Is this a new installation or a replacement? New Replacement What is the deliverable fluid type? Water Steam What fuel is used? Gas Oil How many boilers will you purchase? unit(s) Performance Factors Existing What is the capacity of the existing boiler? MBtu/hr* What is the thermal efficiency of the existing boiler? % Et New What is the capacity of the new boiler?

10

Closed Loop Test Facility for hot dirty gas valves  

SciTech Connect

A design study of a closed loop test facility for eight-inch hot dirty gas valves is presented. The objective of the facility is to quality valves for use in coal gasifiers, combined cycle plants, and pressurized fluid bed combustors. Outline sketches and estimated costs are presented for the selected design.

Not Available

1980-02-06T23:59:59.000Z

11

Closed-loop air cooling system for a turbine engine  

DOE Patents (OSTI)

Method and apparatus are disclosed for providing a closed-loop air cooling system for a turbine engine. The method and apparatus provide for bleeding pressurized air from a gas turbine engine compressor for use in cooling the turbine components. The compressed air is cascaded through the various stages of the turbine. At each stage a portion of the compressed air is returned to the compressor where useful work is recovered.

North, William Edward (Winter Springs, FL)

2000-01-01T23:59:59.000Z

12

Closed loop air cooling system for combustion turbines  

DOE Patents (OSTI)

Convective cooling of turbine hot parts using a closed loop system is disclosed. Preferably, the present invention is applied to cooling the hot parts of combustion turbine power plants, and the cooling provided permits an increase in the inlet temperature and the concomitant benefits of increased efficiency and output. In preferred embodiments, methods and apparatus are disclosed wherein air is removed from the combustion turbine compressor and delivered to passages internal to one or more of a combustor and turbine hot parts. The air cools the combustor and turbine hot parts via convection and heat is transferred through the surfaces of the combustor and turbine hot parts.

Huber, David John (North Canton, OH); Briesch, Michael Scot (Orlando, FL)

1998-01-01T23:59:59.000Z

13

Closed loop air cooling system for combustion turbines  

DOE Patents (OSTI)

Convective cooling of turbine hot parts using a closed loop system is disclosed. Preferably, the present invention is applied to cooling the hot parts of combustion turbine power plants, and the cooling provided permits an increase in the inlet temperature and the concomitant benefits of increased efficiency and output. In preferred embodiments, methods and apparatus are disclosed wherein air is removed from the combustion turbine compressor and delivered to passages internal to one or more of a combustor and turbine hot parts. The air cools the combustor and turbine hot parts via convection and heat is transferred through the surfaces of the combustor and turbine hot parts. 1 fig.

Huber, D.J.; Briesch, M.S.

1998-07-21T23:59:59.000Z

14

Particle sorter comprising a fluid displacer in a closed-loop fluid circuit  

SciTech Connect

Disclosed herein are methods and devices utilizing a fluid displacer in a closed-loop fluid circuit.

Perroud, Thomas D. (San Jose, CA); Patel, Kamlesh D. (Dublin, CA); Renzi, Ronald F. (Tracy, CA)

2012-04-24T23:59:59.000Z

15

Model Free Closed-Loop Flow Control ERCAN ATAM, LIONEL MATHELIN, LAURENT CORDIER  

E-Print Network (OSTI)

Model Free Closed-Loop Flow Control ERCAN ATAM, LIONEL MATHELIN, LAURENT CORDIER *CNRS- Mathelin-Cordier (LIMSI-CNRS,IP') Model Free Closed-Loop Flow Control ECCOMAS'12 1 / 21 #12;Outline 1 and some future work Atam- Mathelin-Cordier (LIMSI-CNRS,IP') Model Free Closed-Loop Flow Control ECCOMAS'12

Mathelin, Lionel

16

SunShot Initiative: Heliostat System with Wireless Closed-Loop Control  

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

Heliostat System with Wireless Heliostat System with Wireless Closed-Loop Control to someone by E-mail Share SunShot Initiative: Heliostat System with Wireless Closed-Loop Control on Facebook Tweet about SunShot Initiative: Heliostat System with Wireless Closed-Loop Control on Twitter Bookmark SunShot Initiative: Heliostat System with Wireless Closed-Loop Control on Google Bookmark SunShot Initiative: Heliostat System with Wireless Closed-Loop Control on Delicious Rank SunShot Initiative: Heliostat System with Wireless Closed-Loop Control on Digg Find More places to share SunShot Initiative: Heliostat System with Wireless Closed-Loop Control on AddThis.com... Concentrating Solar Power Systems Components Competitive Awards CSP Research & Development Thermal Storage CSP Recovery Act Baseload

17

Study of Transients in an Enrichment Closed Loop  

E-Print Network (OSTI)

In the present thesis a mathematic model is presented in order to describe the dynamic behavior inside a closed enrichment loop, the latter representing a single stage of an uranium gaseous diffusion enrichment cascade.The analytical model is turned into a numerical model, and implemented through a computational code.For the verification of the model, measurements were taken in an experimental circuit using air as the process fluid.This circuit was instrumented so as to register its characteristic thermohydraulic variables.The measured transients were simulated, comparing the numerical results with the experimental measurements.A good agreement between the characteristic setting times and the thermohydraulic parameters evolution was observed.Besides, other transients of two species separation were numerically analyzed, including setting times of each magnitude, behavior of each one of them during different transients, and redistribution of concentrations.

Fernandino, M

2002-01-01T23:59:59.000Z

18

Closed loop computer control for an automatic transmission  

DOE Patents (OSTI)

In an automotive vehicle having an automatic transmission that driveably connects a power source to the driving wheels, a method to control the application of hydraulic pressure to a clutch, whose engagement produces an upshift and whose disengagement produces a downshift, the speed of the power source, and the output torque of the transmission. The transmission output shaft torque and the power source speed are the controlled variables. The commanded power source torque and commanded hydraulic pressure supplied to the clutch are the control variables. A mathematical model is formulated that describes the kinematics and dynamics of the powertrain before, during and after a gear shift. The model represents the operating characteristics of each component and the structural arrangement of the components within the transmission being controlled. Next, a close loop feedback control is developed to determine the proper control law or compensation strategy to achieve an acceptably smooth gear ratio change, one in which the output torque disturbance is kept to a minimum and the duration of the shift is minimized. Then a computer algorithm simulating the shift dynamics employing the mathematical model is used to study the effects of changes in the values of the parameters established from a closed loop control of the clutch hydraulic and the power source torque on the shift quality. This computer simulation is used also to establish possible shift control strategies. The shift strategies determined from the prior step are reduced to an algorithm executed by a computer to control the operation of the power source and the transmission.

Patil, Prabhakar B. (Detroit, MI)

1989-01-01T23:59:59.000Z

19

A possibilistic approach to the modeling and resolution of uncertain closed-loop logistics  

Science Conference Proceedings (OSTI)

Closed-loop logistics planning is an important tactic for the achievement of sustainable development. However, the correlation among the demand, recovery, and landfilling makes the estimation of their rates uncertain and difficult. Although the fuzzy ... Keywords: Closed-loop logistics, Fuzzy number, Genetic algorithms, Possibilistic mean, Shortage and surplus

Hsiao-Fan Wang; Hsin-Wei Hsu

2012-06-01T23:59:59.000Z

20

The economics of hybrid manufacturing systems in a closed-loop supply chain  

Science Conference Proceedings (OSTI)

This paper deals with the economics of a closed-loop supply chain and the decision-making in a hybrid manufacturing system. We develop analytic models and quantify the potential profits gain generated by such a hybrid system that collects, remanufactures, ... Keywords: Closed-loop supply chain, Competition, Newsvendor, Remanufacturing, Reverse logistics

Jen-Ming Chen; Chia-I Chang

2012-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "active closed loop" 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

Closed-loop, variable-valve-timing control of a controlled-auto-ignition engine  

E-Print Network (OSTI)

The objective of this study was to develop a closed-loop controller for use on a Controlled-Auto- Ignition (CAI) / Spark-Ignition (SI) mixed mode engine equipped with a variable-valve-timing (VVT) mechanism. The controller ...

Matthews, Jeffrey A., 1970-

2004-01-01T23:59:59.000Z

22

CNCC Craig Campus Geothermal Program: 82-well closed loop GHP well field to  

Open Energy Info (EERE)

CNCC Craig Campus Geothermal Program: 82-well closed loop GHP well field to CNCC Craig Campus Geothermal Program: 82-well closed loop GHP well field to provide geothermal energy as a common utility for a new community college campus. Geothermal Project Jump to: navigation, search Last modified on July 22, 2011. Project Title CNCC Craig Campus Geothermal Program: 82-well closed loop GHP well field to provide geothermal energy as a common utility for a new community college campus. Project Type / Topic 1 Recovery Act - Geothermal Technologies Program: Ground Source Heat Pumps Project Type / Topic 2 Topic Area 1: Technology Demonstration Projects Project Description This "geothermal central plant" concept will provide ground source loop energy as a utility to be shared by the academic and residential buildings on the soon-to-be-constructed campus.

23

Film cooling air pocket in a closed loop cooled airfoil  

SciTech Connect

Turbine stator vane segments have radially inner and outer walls with vanes extending between them. The inner and outer walls are compartmentalized and have impingement plates. Steam flowing into the outer wall plenum passes through the impingement plate for impingement cooling of the outer wall upper surface. The spent impingement steam flows into cavities of the vane having inserts for impingement cooling the walls of the vane. The steam passes into the inner wall and through the impingement plate for impingement cooling of the inner wall surface and for return through return cavities having inserts for impingement cooling of the vane surfaces. To provide for air film cooing of select portions of the airfoil outer surface, at least one air pocket is defined on a wall of at least one of the cavities. Each air pocket is substantially closed with respect to the cooling medium in the cavity and cooling air pumped to the air pocket flows through outlet apertures in the wall of the airfoil to cool the same.

Yu, Yufeng Phillip (Simpsonville, SC); Itzel, Gary Michael (Simpsonville, SC); Osgood, Sarah Jane (East Thetford, VT); Bagepalli, Radhakrishna (Schenectady, NY); Webbon, Waylon Willard (Greenville, SC); Burdgick, Steven Sebastian (Schenectady, NY)

2002-01-01T23:59:59.000Z

24

Distributed digital processing and closed loop computer control of wastewater treatment  

Science Conference Proceedings (OSTI)

The application of digital computer control to municipal wastewater treatment processes is steadily gaining popularity. Within the next few years this mode of control is expected to become a standard feature of larger wastewater treatment plants. The ... Keywords: Closed loop systems, PID control, computer application, computer control, digital control, direct digital control, ecology, feedback, feedforward, water pollution

Bipin Mishra

1980-01-01T23:59:59.000Z

25

Charge Detection in a Closed-Loop Aharonov-Bohm Interferometer  

E-Print Network (OSTI)

We report on a study of complementarity in a two-terminal "closed-loop" Aharonov-Bohm interferometer. In this interferometer, the simple picture of two-path interference cannot be applied. We introduce a nearby quantum point contact to detect the electron in a quantum dot inserted in the interferometer. We found that charge detection reduces but does not completely suppress the interference even in the limit of perfect detection. We attribute this phenomenon to the unique nature of the closed-loop interferometer. That is, the closed-loop interferometer cannot be simply regarded as a two-path interferometer because of multiple reflections of electrons. As a result, there exist indistinguishable paths of the electron in the interferometer and the interference survives even in the limit of perfect charge detection. This implies that charge detection is not equivalent to path detection in a closed-loop interferometer. We also discuss the phase rigidity of the transmission probability for a two-terminal conductor in the presence of a detector.

Gyong Luck Khym; Kicheon Kang

2006-06-14T23:59:59.000Z

26

Motor Modeling and Position Control Lab Week 3: Closed Loop Control  

E-Print Network (OSTI)

Motor Modeling and Position Control Lab Week 3: Closed Loop Control 1. Review In the first week of motor modeling lab, a mathematical model of a DC motor from first principles was derived to obtain specifically for this motor model. In the second week, a physical DC motor (Quanser SRV-02) was used for open

Krovi, Venkat

27

Pollution Reduction System that Generates Profits (Cascading Closed Loop Cycle - CCLC)  

E-Print Network (OSTI)

WOW Energy Inc. (WOW) recently received notification from the patent office that its patent claims for the Cascading Closed Loop Cycle (CCLC) were valid for converting waste heat to electricity in a process using standard off-the-shelf components. These c

Stinger, D. H.; Mian, F.

2004-01-01T23:59:59.000Z

28

Forced flow supercritical helium in a closed heat transfer loop subjected to pulsed heat loads  

Science Conference Proceedings (OSTI)

The superconducting magnets of the tokamak JT-60SA are cooled by means of forced flows of supercritical helium at 4.4 K and 0.5 MPa. The closed loops transfer heat from the magnets to the refrigerator through heat exchangers immersed into a saturated liquid helium bath. An experimental loop was designed to represent a 1/20 scaled down mock-up of JT-60SA central solenoid cooling circuits. This design for keeping the same transit times in the helium circuits

2012-01-01T23:59:59.000Z

29

Closed-loop flow test Miravalles Geothermal Field well log results  

DOE Green Energy (OSTI)

The Instituto Costarricense de Electricidad (ICE) conducted a closed-loop flow test in the Miravalles Geothermal Field. The closed-loop test was started in May and ran through August of 1990. The effluent from the production well PG-11 was carried by a pipeline through a monitor station to the injection well PG-2. Before starting the long-term flow test in May, cold-water injection experiments were performed in each well to determine the pressure and temperature response. A series of downhole measurements were made in each well to obtain background information. The downhole measurements were repeated in August just before terminating the flow test to evaluate the results.

Dennis, B.; Eden, G.; Lawton, R.

1992-01-01T23:59:59.000Z

30

Program on Technology Innovation: Modeling of Single-Well Closed-Loop Enhanced Geothermal Systems  

Science Conference Proceedings (OSTI)

Conventional enhanced geothermal systems (EGSs) include one production well and one injection well to use hydrothermal resources to generate electricity. However, the high initial cost of drilling EGS wells is one of the main factors that hurt its competitiveness with other energy sources. The single-well closed-loop EGS (SWCLEGS) is a new type of geothermal power generation technology that aims to eliminate the need for natural hydrothermal resources with a relatively low drilling cost. The objective of...

2012-02-28T23:59:59.000Z

31

On active region loops: Hinode/EIS observations  

E-Print Network (OSTI)

Coronal loops are fundamental building blocks of the solar active regions and the corona. Therefore, a clear understanding of the physics of coronal loops will help us understand the physics of active region heating in particular and coronal heating in general. This requires a precise measurement of physical quantities such as electron densities and filling factors, temperatures, and flows in coronal loops. In this paper we have carried out an investigation of a spatially well resolved coronal loop using the EIS onboard Hinode to measure the above mentioned physical quantities. Based on this study we find that a nano-flare model could explain most of the observed characteristics of this loop.

Tripathi, D; Dwivedi, B N; Del Zanna, G; Young, P R

2009-01-01T23:59:59.000Z

32

AB Method of Irrigation without Water (Closed-loop water cycle)  

E-Print Network (OSTI)

Author suggests and researches a new revolutionary idea for a closed-loop irrigation method. He offers to cover a given site by a thin closed film with controlled heat conductivity and clarity located at an altitude of 50 300 m. The film is supported at altitude by small additional atmospheric overpressure and connected to the ground by thin cables. Authors show that this closed dome allows full control of the weather in a given region (the day is always fine, the rain is only at night, no strong winds). The dome (having control of the clarity of film and heat conductivity) converts the cold regions to subtropics, hot deserts and desolate wildernesses to prosperous regions with a temperate climate. This is a realistic and cheap method of evaporation economical irrigation and virtual weather control on Earth at the current time.

Alexander Bolonkin

2007-12-26T23:59:59.000Z

33

Integrated dynamic and simulation model on coupled closed-loop workstation capacity controls in a multi-workstation production system  

Science Conference Proceedings (OSTI)

In this paper, a dynamic model coupled with a simulation model is introduced to control a multi-workstation production system such that a given performance measure is achieved. In particular, we consider closed loop capacity controls for regulating WIP ...

Tao Wu; Leyuan Shi; Benjamin Quirt; N. A. Duffie

2008-12-01T23:59:59.000Z

34

Closed loop chemical systems for energy storage and transmission (chemical heat pipe). Final report  

DOE Green Energy (OSTI)

The work documents the anlaysis of closed loop chemical systems for energy storage and transmission, commonly referred to as the Chemical Heat Pipe (CHP). Among the various chemical reaction systems and sources investigated, the two best systems were determined to be the high temperature methane/steam reforming reaction (HTCHP) coupled to a Very High Temperature Gas Cooled Reactor (VHTR) and the lower temperature, cyclohexane dehydrogenation reaction (LTCHP) coupled to existing sources such as coal or light water reactors. Solar and other developing technologies can best be coupled to the LTCHP. The preliminary economic and technical analyses show that both systems could transport heat at an incremental cost of approximately $1.50/GJ/160 km (in excess of the primary heat cost of $2.50/GJ), at system efficiencies above 80%. Solar heat can be transported at an incremental cost of $3/GJ/160 km. The use of the mixed feed evaporator concept developed in this work contributes significantly to reducing the transportation cost and increasing the efficiency of the system. The LTCHP shows the most promise of the two systems if the technical feasibility of the cyclic closed loop chemical reaction system can be established. An experimental program for establishing this feasibility is recommended. Since the VHTR is several years away from commercial demonstration and the HTCHP chemical technology is well developed, future HTCHP programs should be aimed at VHTR and interface problems.

Vakil, H.B.; Flock, J.W.

1978-02-01T23:59:59.000Z

35

ICFT: An initial closed-loop flow test of the Fenton Hill Phase II HDR reservoir  

DOE Green Energy (OSTI)

A 30-day closed-loop circulation test of the Phase II Hot Dry Rock reservoir at Fenton Hill, New Mexico, was conducted to determine the thermal, hydraulic, chemical, and seismic characteristics of the reservoir in preparation for a long-term energy-extraction test. The Phase II heat-extraction loop was successfully tested with the injection of 37,000 m/sup 3/ of cold water and production of 23,300 m/sup 3/ of hot water. Up to 10 MW/sub t/ was extracted when the production flow rate reached 0.0139 m/sup 3//s at 192/degree/C. By the end of the test, the water-loss rate had decreased to 26% and a significant portion of the injected water was recovered; 66% during the test and an additional 20% during subsequent venting. Analysis of thermal, hydraulic, geochemical, tracer, and seismic data suggests the fractured volume of the reservoir was growing throughout the test. 19 refs., 64 figs., 19 tabs.

Dash, Z.V. (ed.); Aguilar, R.G.; Dennis, B.R.; Dreesen, D.S.; Fehler, M.C.; Hendron, R.H.; House, L.S.; Ito, H.; Kelkar, S.M.; Malzahn, M.V.

1989-02-01T23:59:59.000Z

36

Development of a closed-loop, lean-burn natural gas engine control system. Final report, February 1993-December 1995  

SciTech Connect

The overall objective of this project was to develop a closed-loop, lean-burn control system for medium and heavy duty, lean-burn, gaseous fueled engines. The closed-loop F/A ratio control system was designed to provide diesel engine-like performance and fuel economy, and take advantage of the emissions benefits of a gaseous fueled engine. The control system was designed to have the processing power and I/O capacity to accommodate the engine Original Equipment Manufacturers (OEM`s).

Morris, D.A.

1996-06-01T23:59:59.000Z

37

Belgium east loop active network management (Smart Grid Project) | Open  

Open Energy Info (EERE)

Belgium east loop active network management (Smart Grid Project) Belgium east loop active network management (Smart Grid Project) Jump to: navigation, search Project Name Belgium east loop active network management Country Belgium Coordinates 50.148746°, 4.086914° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":50.148746,"lon":4.086914,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

38

Steelcase's Closed-Loop Energy Recovery System Results in $250,000 Savings Annually  

E-Print Network (OSTI)

Steelcase Inc. put a closed-loop energy recovery system into operation in August, 1980, with the installation of a $1.1 million waste incinerator. The system provides steam for process applications in the company's main complex. Processable waste includes wood, cardboard, paper, fabrics, paint sludge, and solvent sludge. Incineration reduces waste volume, cutting landfill and hauling charges substantially. Heat recovery has lowered natural gas bills by 10%. Net annual savings average more than $250,000, and a payback period of 3.4 years is projected for the system. The energy recovery program at Steelcase Inc. is based on the premise that there is a very important relationship between money and trash. For years, Steelcase not only threw its trash away, but, in fact, incurred the expense of transporting accumulated waste from the plant complex in Grand Rapids, Michigan, to public landfill sites in other parts of the state. In other words, we were wasting money by ignoring a perfectly good energy source, and wasting additional money by hiring contract haulers to take that energy source to the dump. Steelcase is the world's largest manufacturer of office furniture. More than 5,000 people work at our main complex, where facilities cover 6,000,000 square feet. We pioneered the movement toward systems furniture ten years ago. And now, with the same innovative spirit, we're tackling the problem of energy recovery. When the cost of fossil fuels began soaring in the mid-1970's, company engineers took a long, hard look at our disposal methods and our energy situation and started laying the groundwork for a closed loop system. In 1979, after years of study, a local engineering firm was hired to help us design and install the equipment for a steam-generating waste incinerator in the Michigan center of the Steelcase complex. The result is the new Energy Recovery Plant, completed in August, 1980, at a cost of $1.1 million. The plant has been in operation approximately eight months, and it is already running at a rate of efficiency that exceeds our expectations. We had an estimated savings of more than $280,000 in 1980 alone; and our projections for the next few years indicate that the amount of our savings will grow each year, in keeping with predicted increases in the price of fuel. We estimate a payback period for the plant of less than three years. Steelcase chose incineration as the method of energy recovery for a variety of reasons. Feasibility studies showed that incineration would be a relatively low-cost investment. The waste stream going into an incinerator requires little or no preparation, so we realized an immediate savings in the purchase and operation of processing equipment. Incineration reduces the volume of our waste stream by approximately 90% which means that hauling costs and landfill charges are substantially reduced. Furthermore, an incinerator system can be installed on a modular basis. A modular approach appealed to us because it gave us an extra measure of flexibility and enabled us to commit corporate funds in a step-by-step manner.

Wege, P. M.

1981-01-01T23:59:59.000Z

39

Optimal Planning of a Load Transfer Substation Pair between Two Normally Closed-Loop Feeders Considering Minimization of System Power Losses Using a Genetic Algorithm  

Science Conference Proceedings (OSTI)

This paper proposes an effective approach for planning a load transfer substation pair(LTSP) between two normally closed-loop feeders considering minimization of system power losses. Firstly, the annual equivalent load of each load point is calculated. ... Keywords: distribution feeder, normally closed-loop feeder, distribution substation, genetic algorithm, power losses

Wei-Tzer Huang; Kai-chao Yao; Shiuan-Tai Chen; Hsiau-Hsian Nien; Deng-Chung Lin; Po-Tung Huang

2010-12-01T23:59:59.000Z

40

Performance of MEMS-based visible-light adaptive optics at Lick Observatory: Closed- and open-loop control  

E-Print Network (OSTI)

At the University of California's Lick Observatory, we have implemented an on-sky testbed for next-generation adaptive optics (AO) technologies. The Visible-Light Laser Guidestar Experiments instrument (ViLLaGEs) includes visible-light AO, a micro-electro-mechanical-systems (MEMS) deformable mirror, and open-loop control of said MEMS on the 1-meter Nickel telescope at Mt. Hamilton. In this paper we evaluate the performance of ViLLaGEs in open- and closed-loop control, finding that both control methods give equivalent Strehl ratios of up to ~ 7% in I-band and similar rejection of temporal power. Therefore, we find that open-loop control of MEMS on-sky is as effective as closed-loop control. Furthermore, after operating the system for three years, we find MEMS technology to function well in the observatory environment. We construct an error budget for the system, accounting for 130 nm of wavefront error out of 190 nm error in the science-camera PSFs. We find that the dominant known term is internal static error...

Morzinski, Katie; Gavel, Donald T; Grigsby, Bryant; Dillon, Daren; Reinig, Marc; Macintosh, Bruce A

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "active closed loop" 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

PHYSICAL PROPERTIES OF COOLING PLASMA IN QUIESCENT ACTIVE REGION LOOPS  

Science Conference Proceedings (OSTI)

In the present work, we use SOHO/SUMER, SOHO/UVCS, SOHO/EIT, SOHO/LASCO, STEREO/EUVI, and Hinode/EIS coordinated observations of an active region (AR 10989) at the west limb taken on 2008 April 8 to study the cooling of coronal loops. The cooling plasma is identified using the intensities of SUMER spectral lines emitted at temperatures in the 4.15 {EIS and SUMER spectral observations are used to measure the physical properties of the loops. We found that before cooling took place these loops were filled with coronal hole-like plasma, with temperatures in the 5.6 {<=} log T {<=} 5.9 range. SUMER spectra also allowed us to determine the plasma temperature, density, emission measure, element abundances, and dynamic status during the cooling process. The ability of EUVI to observe the emitting region from a different direction allowed us to measure the volume of the emitting region and estimate its emission measure. Comparison with values measured from line intensities provided us with an estimate of the filling factor. UVCS observations of the coronal emission above the active region showed no streamer structure associated with AR 10989 at position angles between 242{sup 0}and 253.{sup 0} EIT, LASCO, and EUVI-A narrowband images and UVCS spectral observations were used to discriminate between different scenarios and monitor the behavior of the active region in time. The present study provides the first detailed measurements of the physical properties of cooling loops, a very important benchmark for theoretical models of loop cooling and condensation.

Landi, E. [Artep, Inc. at Naval Research Laboratory, 4555 Overlook Ave. S.W., 20375-5320, Washington DC (United States); Miralles, M. P. [Harvard-Smithsonian Center for Astrophysics, 60 Garden St., MS-50, Cambridge, MA 02138 (United States); Curdt, W. [Max Planck Institut fuer Sonnensystemforschung, Max Planck Strasse 2, Katlenburg-Lindau 37191 (Germany); Hara, H. [National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588 (Japan)

2009-04-10T23:59:59.000Z

42

Diagnosis and Isolation of Air Gap Eccentricities in Closed-loop Controlled Doubly-Fed Induction Generators  

E-Print Network (OSTI)

With the widespread use of doubly-fed induction generators (DFIG) in wind energy conversion systems, condition monitoring is being given importance. Non-intrusive techniques like motor current signature analysis (MCSA), which involves looking for specific frequency components in the current spectrum, are preferred over analysis of magnetic field, temperature, vibrations or acoustic noise which require additional sensors. The major difficulty in MCSA is isolation of the fault, as multiple faults produce similar signatures. Moreover, closed-loop control makes diagnostics more complicated due to inherent compensation by the controller. This thesis presents a method to diagnose static and dynamic air gap eccentricities in doubly-fed induction generators operated for closed-loop stator power control by using a modified control technique to enable detection and isolation of this fault from electrical unbalances in the stator and rotor and load torque oscillations that produce similar effects. The effectiveness of the proposed control is verified using simulations and preliminary experiments performed on a healthy machine.

Meenakshi Sundaram, Vivek

2011-05-01T23:59:59.000Z

43

VELOCITY MEASUREMENTS FOR A SOLAR ACTIVE REGION FAN LOOP FROM HINODE/EIS OBSERVATIONS  

Science Conference Proceedings (OSTI)

The velocity pattern of a fan loop structure within a solar active region over the temperature range 0.15-1.5 MK is derived using data from the EUV Imaging Spectrometer (EIS) on board the Hinode satellite. The loop is aligned toward the observer's line of sight and shows downflows (redshifts) of around 15 km s{sup -1} up to a temperature of 0.8 MK, but for temperatures of 1.0 MK and above the measured velocity shifts are consistent with no net flow. This velocity result applies over a projected spatial distance of 9 Mm and demonstrates that the cooler, redshifted plasma is physically disconnected from the hotter, stationary plasma. A scenario in which the fan loops consist of at least two groups of 'strands'-one cooler and downflowing, the other hotter and stationary-is suggested. The cooler strands may represent a later evolutionary stage of the hotter strands. A density diagnostic of Mg VII was used to show that the electron density at around 0.8 MK falls from 3.2 Multiplication-Sign 10{sup 9} cm{sup -3} at the loop base, to 5.0 Multiplication-Sign 10{sup 8} cm{sup -3} at a projected height of 15 Mm. A filling factor of 0.2 is found at temperatures close to the formation temperature of Mg VII (0.8 MK), confirming that the cooler, downflowing plasma occupies only a fraction of the apparent loop volume. The fan loop is rooted within a so-called outflow region that displays low intensity and blueshifts of up to 25 km s{sup -1} in Fe XII {lambda}195.12 (formed at 1.5 MK), in contrast to the loop's redshifts of 15 km s{sup -1} at 0.8 MK. A new technique for obtaining an absolute wavelength calibration for the EIS instrument is presented and an instrumental effect, possibly related to a distorted point-spread function, that affects velocity measurements is identified.

Young, P. R. [College of Science, George Mason University, 4400 University Drive, Fairfax, VA 22030 (United States); O'Dwyer, B.; Mason, H. E. [Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Wilberforce Road, Cambridge, CB3 0WA (United Kingdom)

2012-01-01T23:59:59.000Z

44

Method of digital epitaxy by externally controlled closed-loop feedback  

DOE Patents (OSTI)

A method and apparatus for digital epitaxy are disclosed. The apparatus includes a pulsed gas delivery assembly that supplies gaseous material to a substrate to form an adsorption layer of the gaseous material on the substrate. Structure is provided for measuring the isothermal desorption spectrum of the growth surface to monitor the active sites which are available for adsorption. The vacuum chamber housing the substrate facilitates evacuation of the gaseous material from the area adjacent the substrate following exposure. In use, digital epitaxy is achieved by exposing a substrate to a pulse of gaseous material to form an adsorption layer of the material on the substrate. The active sites on the substrate are monitored during the formation of the adsorption layer to determine if all the active sites have been filled. Once the active sites have been filled on the growth surface of the substrate, the pulse of gaseous material is terminated. The unreacted portion of the gas pulse is evacuated by continuous pumping. Subsequently, a second pulse is applied when availability of active sites is determined by studying the isothermal desorption spectrum. These steps are repeated until a thin film of sufficient thickness is produced. 4 figs.

Eres, D.; Sharp, J.W.

1994-07-19T23:59:59.000Z

45

Multispectral polarimetric sensor for glucose monitoring utilizing a digital closed-loop control system  

E-Print Network (OSTI)

Treatment of many medical disorders, such as diabetes hics. and other hormonal or metabolic imbalances, requires accurate blood analysis. Conventionally, blood is analyzed by withdrawing a sample from the body of the subject. One of the major disadvantages of conventional methods is the invasive nature of the tests that raise the risk of patient infection and discomfort. The polarimetric approach is currently being researched to determine glucose levels in the body non-invasively. Polarized light experiences a change in its plane of rotation that is proportional to the concentration of the sample when passed through an optically choral sample such as glucose. A multi-wavelength, multi-beam polarimetric device has been designed and implemented. The potential site for in-vivo measurements is the aqueous humor of the eye, which shows glucose concentrations proportional to the concentrations in the blood. The purpose of this dual wavelength device is to provide the means for overcoming two important problems with in-vivo glucose monitoring, namely, motion artifacts and the presence of other optically active substances at the test site. The device was tested in-vitro for accuracy and sensitivity. It predicted glucose to within an average standard deviation of 9.88mg/d1 for 670nm wavelength and 7.61mg/dl for the 820nm wavelength for the hyperglycemic ranges of 0-600mg/dl of glucose doped water. Improved results were obtained for glucose predictions in the hypoglycemic range of 0-100mg/dl of glucose. Glucose was predicted to within a standard deviation of 9.57mg/d1 for the 67013m wavelength and 5.35mg/dl for the 820nm wavelength. The system was also able to extract glucose information to within an average standard deviation of 24.41mg/dl from a solution of albumin and glucose, albumin being the other choral substance used in this study. Motion artifact studies indicated a clear trend of the two wavelengths in tracking each other, which potentially could be used to allow for glucose measurements in the presence of motion artifacts. The novelty of the system was its simultaneous dual wavelength approach and a fast feedback control system implemented in Labview. Overall, the results are satisfactory and show considerable being developed as an important approach to glucose potential in this technique sensing.

Gorde, Harshal Wasudeo

1998-01-01T23:59:59.000Z

46

Modeling of decentralized linear observer and tracker for a class of unknown interconnected large-scale sampled-data nonlinear systems with closed-loop decoupling property  

Science Conference Proceedings (OSTI)

A novel low-order modeling of decentralized linear observer-based tracker is presented in this paper for a class of unknown interconnected large-scale sampled-data nonlinear systems with closed-loop decoupling property. The appropriate (low-)order decentralized ... Keywords: Digital redesign, Large-scale system, Observer, Observer/Kalman filter identification, Tracker

Jason Sheng-Hong Tsai; Nien-Tsu Hu; Po-Chuan Yang; Shu-Mei Guo; Leang-San Shieh

2010-08-01T23:59:59.000Z

47

Acetylation of MEK2 and I B kinase (IKK) activation loop residues by YopJ inhibits signaling  

E-Print Network (OSTI)

Acetylation of MEK2 and I B kinase (IKK) activation loop residues by YopJ inhibits signaling Rohit modifi- cation prevents the phosphorylation of these serine residues that is required for activation residue in the activation loop of both the and subunits of the NF- B pathway kinase, IKK. These results

McMahon, Harvey

48

Open-cycle magnetohydrodynamic power plant based upon direct-contact closed-loop high-temperature heat exchanger  

DOE Patents (OSTI)

A magnetohydrodynamic (MHD) power generating system in which ionized combustion gases with slag and seed are discharged from an MHD combustor and pressurized high temperature inlet air is introduced into the combustor for supporting fuel combustion at high temperatures necessary to ionize the combustion gases, and including a heat exchanger in the form of a continuous loop with a circulating heat transfer liquid such as copper oxide. The heat exchanger has an upper horizontal channel for providing direct contact between the heat transfer liquid and the combustion gases to cool the gases and condense the slag which thereupon floats on the heat transfer liquid and can be removed from the channel, and a lower horizontal channel for providing direct contact between the heat transfer liquid and pressurized air for preheating the inlet air. The system further includes a seed separator downstream of the heat exchanger.

Berry, Gregory F. (Naperville, IL); Minkov, Vladimir (Skokie, IL); Petrick, Michael (Joliet, IL)

1988-01-01T23:59:59.000Z

49

Small Molecule Receptor Protein Tyrosine Phosphatase [gamma] (RPTP[gamma]) Ligands That Inhibit Phosphatase Activity via Perturbation of the Tryptophan?Proline?Aspartate (WPD) Loop  

SciTech Connect

Protein tyrosine phosphatases (PTPs) catalyze the dephosphorylation of tyrosine residues, a process that involves a conserved tryptophan-proline-aspartate (WPD) loop in catalysis. In previously determined structures of PTPs, the WPD-loop has been observed in either an 'open' conformation or a 'closed' conformation. In the current work, X-ray structures of the catalytic domain of receptor-like protein tyrosine phosphatase {gamma} (RPTP{gamma}) revealed a ligand-induced 'superopen' conformation not previously reported for PTPs. In the superopen conformation, the ligand acts as an apparent competitive inhibitor and binds in a small hydrophobic pocket adjacent to, but distinct from, the active site. In the open and closed WPD-loop conformations of RPTP{gamma}, the side chain of Trp1026 partially occupies this pocket. In the superopen conformation, Trp1026 is displaced allowing a 3,4-dichlorobenzyl substituent to occupy this site. The bound ligand prevents closure of the WPD-loop over the active site and disrupts the catalytic cycle of the enzyme.

Sheriff, Steven; Beno, Brett R.; Zhai, Weixu; Kostich, Walter A.; McDonnell, Patricia A.; Kish, Kevin; Goldfarb, Valentina; Gao, Mian; Kiefer, Susan E.; Yanchunas, Joseph; Huang, Yanling; Shi, Shuhao; Zhu, Shirong; Dzierba, Carolyn; Bronson, Joanne; Macor, John E.; Appiah, Kingsley K.; Westphal, Ryan S.; O’ Connell, Jonathan; Gerritz, Samuel W. (BMS)

2012-11-09T23:59:59.000Z

50

Window-closing safety system  

DOE Patents (OSTI)

A safety device includes a wire loop embedded in the glass of a passenger car window and routed near the closing leading-edge of the window. The wire loop carries microwave pulses around the loop to and from a transceiver with separate output and input ports. An evanescent field only an inch or two in radius is created along the wire loop by the pulses. Just about any object coming within the evanescent field will dramatically reduce the energy of the microwave pulses received back by the transceiver. Such a loss in energy is interpreted as a closing area blockage, and electrical interlocks are provided to halt or reverse a power window motor that is actively trying to close the window. 5 figs.

McEwan, T.E.

1997-08-26T23:59:59.000Z

51

Window-closing safety system  

DOE Patents (OSTI)

A safety device includes a wire loop embedded in the glass of a passenger car window and routed near the closing leading-edge of the window. The wire loop carries microwave pulses around the loop to and from a transceiver with separate output and input ports. An evanescent field only and inch or two in radius is created along the wire loop by the pulses. Just about any object coming within the evanescent field will dramatically reduce the energy of the microwave pulses received back by the transceiver. Such a loss in energy is interpreted as a closing area blockage, and electrical interlocks are provided to halt or reverse a power window motor that is actively trying to close the window.

McEwan, Thomas E. (Livermore, CA)

1997-01-01T23:59:59.000Z

52

SATB1 packages densely-looped, transciptionally-active chromatinfor coordinated expression of cytokine genes  

SciTech Connect

SATB1 is an important regulator of nuclear architecture that anchors specialized DNA sequences onto its cage-like network and recruits chromatin remodeling/modifying factors to control gene transcription. We studied the role of SATB1 in regulating the coordinated expression of Il5, Il4, and Il13 from the 200kb cytokine gene cluster region of mouse chromosome 11 during T-helper 2 (Th2)-cell activation. We show that upon cell activation, SATB1 is rapidly induced to form a unique transcriptionally-active chromatin structure that includes the cytokine gene region. Chromatin is folded into numerous small loops all anchored by SATB1, is histone H3 acetylated at lysine 9/14, and associated with Th2-specific factors, GATA3, STAT6, c-Maf, the chromatin-remodeling enzyme Brg-1, and RNA polymerase II across the 200kb region. Before activation, the chromatin displays some of these features, such as association with GATA3 and STAT6, but these were insufficient for cytokine gene expression. Using RNA interference (RNAi), we show that upon cell activation, SATB1 is not only required for chromatin folding into dense loops, but also for c-Maf induction and subsequently for Il4, Il5, and Il13 transcription. Our results show that SATB1 is an important determinant for chromatin architecture that constitutes a novel higher-order, transcriptionally-active chromatin structure upon Th2-cell activation.

Cai, Shutao; Lee, Charles C.; Kohwi-Shigematsu, Terumi

2006-05-23T23:59:59.000Z

53

Yosemite Closing the Loop Project  

E-Print Network (OSTI)

A summary of the properties of the pure biodiesel fuel, thepreparing the biodiesel blend. Table 1. Fuel Properties Fuel

Durbin, T

2005-01-01T23:59:59.000Z

54

CNCC Craig Campus Geothermal Project: 82-well closed loop GHP well field to provide geothermal energy as a common utilitiy for a new community college campus  

Science Conference Proceedings (OSTI)

Colorado Northwestern Community College (CNCC) is working collaboratively with recipient vendor Chevron Energy Solutions, an energy services company (ESCO), to develop an innovative GHP project at the new CNCC Campus constructed in 2010/2011 in Craig, Colorado. The purpose of the CNCC Craig Campus Geothermal Program scope was to utilize an energy performance contracting approach to develop a geothermal system with a shared closed-loop field providing geothermal energy to each building's GHP mechanical system. Additional benefits to the project include promoting good jobs and clean energy while reducing operating costs for the college. The project has demonstrated that GHP technology is viable for new construction using the energy performance contracting model. The project also enabled the project team to evaluate several options to give the College a best value proposition for not only the initial design and construction costs but build high performance facilities that will save the College for many years to come. The design involved comparing the economic feasibility of GHP by comparing its cost to that of traditional HVAC systems via energy model, financial life cycle cost analysis of energy savings and capital cost, and finally by evaluating the compatibility of the mechanical design for GHP compared to traditional HVAC design. The project shows that GHP system design can be incorporated into the design of new commercial buildings if the design teams, architect, contractor, and owner coordinate carefully during the early phases of design. The public also benefits because the new CNCC campus is a center of education for the much of Northwestern Colorado, and students in K-12 programs (Science Spree 2010) through the CNCC two-year degree programs are already integrating geothermal and GHP technology. One of the greatest challenges met during this program was coordination of multiple engineering and development stakeholders. The leadership of Principle Investigator Pres. John Boyd of CNCC met this challenge by showing clear leadership in setting common goals and resolving conflicts early in the program.

Chevron Energy Solutions; Matt Rush; Scott Shulda

2011-01-03T23:59:59.000Z

55

Internal flow patterns on heat transfer characteristics of a closed-loop oscillating heat-pipe with check valves using ethanol and a silver nano-ethanol mixture  

Science Conference Proceedings (OSTI)

The aim of this research was to investigate the internal flow patterns and heat transfer characteristics of a closed-loop oscillating heat-pipe with check valves (CLOHP/CV). The ratio of number of check valves to meandering turns was 0.2. Ethanol and a silver nano-ethanol mixture were used as working fluids with a filling ratio of 50% by total volume of tube. The CLOHP/CV was made of a glass tube with an inside diameter of 2.4 mm. The evaporator section was 50 mm and 100 mm in length and there were 10 meandering turns. An inclination angle of 90 from horizontal axis was established. The evaporator section was heated by an electric heater and the condenser section was cooled by distilled water. Temperature at the evaporator section was controlled at 85 C, 105 C and 125 C. The inlet and outlet temperatures were measured. A digital camera and video camera were used to observe the flow patterns at the evaporator. The silver nano-ethanol mixture gave higher heat flux than ethanol. When the temperature at the evaporator section was increased from 85 C to 105 C and 125 C. It was found that, the flow patterns occurred as annular flow + slug flow, slug flow + bubble flow and dispersed bubble flow + bubble flow respectively. The main regime of each flow pattern can be determined from the flow pattern map ethanol and a silver nano-ethanol mixture. Each of the two working fluids gave corresponding flow patterns. (author)

Bhuwakietkumjohn, N.; Rittidech, S. [Heat Pipe and Thermal Tools Design Research Laboratory (HTDR), Faculty of Engineering, Mahasarakham University, Mahasarakham 44150 (Thailand)

2010-11-15T23:59:59.000Z

56

Mathematical Analysis of High-Temperature Co-electrolysis of CO2 and O2 Production in a Closed-Loop Atmosphere Revitalization System  

DOE Green Energy (OSTI)

NASA has been evaluating two closed-loop atmosphere revitalization architectures based on Sabatier and Bosch carbon dioxide, CO2, reduction technologies. The CO2 and steam, H2O, co-electrolysis process is another option that NASA has investigated. Utilizing recent advances in the fuel cell technology sector, the Idaho National Laboratory, INL, has developed a CO2 and H2O co-electrolysis process to produce oxygen and syngas (carbon monoxide, CO and hydrogen, H2 mixture) for terrestrial (energy production) application. The technology is a combined process that involves steam electrolysis, CO2 electrolysis, and the reverse water gas shift (RWGS) reaction. A number of process models have been developed and analyzed to determine the theoretical power required to recover oxygen, O2, in each case. These models include the current Sabatier and Bosch technologies and combinations of those processes with high-temperature co-electrolysis. The cases of constant CO2 supply and constant O2 production were evaluated. In addition, a process model of the hydrogenation process with co-electrolysis was developed and compared. Sabatier processes require the least amount of energy input per kg of oxygen produced. If co-electrolysis replaces solid polymer electrolyte (SPE) electrolysis within the Sabatier architecture, the power requirement is reduced by over 10%, but only if heat recuperation is used. Sabatier processes, however, require external water to achieve the lower power results. Under conditions of constant incoming carbon dioxide flow, the Sabatier architectures require more power than the other architectures. The Bosch, Boudouard with co-electrolysis, and the hydrogenation with co-electrolysis processes require little or no external water. The Bosch and hydrogenation processes produce water within their reactors, which aids in reducing the power requirement for electrolysis. The Boudouard with co-electrolysis process has a higher electrolysis power requirement because carbon dioxide is split instead of water, which has a lower heat of formation. Hydrogenation with co-electrolysis offers the best overall power performance for two reasons: it requires no external water, and it produces its own water, which reduces the power requirement for co-electrolysis.

Michael G. McKellar; Manohar S. Sohal; Lila Mulloth; Bernadette Luna; Morgan B. Abney

2010-03-01T23:59:59.000Z

57

THE EFFECTS OF CLOSE COMPANIONS (AND ROTATION) ON THE MAGNETIC ACTIVITY OF M DWARFS  

SciTech Connect

We present a study of close white dwarf and M dwarf (WD+dM) binary systems and examine the effect that a close companion has on the magnetic field generation in M dwarfs. We use a base sample of 1602 white dwarf main-sequence binaries from Rebassa-Mansergas et al. to develop a set of color cuts in GALEX, SDSS, UKIDSS, and 2MASS color space. Then using the SDSS Data Release 8 spectroscopic database, we construct a sample of 1756 WD+dM high-quality pairs from our color cuts and previous catalogs. We separate the individual WD and dM from each spectrum using an iterative technique that compares the WD and dM components to best-fit templates. Using the absolute height above the Galactic plane as a proxy for age, and the H{alpha} emission line as an indicator for magnetic activity, we investigate the age-activity relation for our sample for spectral types {<=} M7. Our results show that early-type M dwarfs ({<=}M4) in close binary systems are more likely to be active and have longer activity lifetimes compared to their field counterparts. However, at a spectral type of M5 (just past the onset of full convection in M dwarfs), the activity fraction and lifetimes of WD+dM binary systems become more comparable to that of the field M dwarfs. One of the implications of having a close binary companion is presumed to be increased stellar rotation through disk disruption, tidal effects, or angular momentum exchange. Thus, we interpret the similarity in activity behavior between late-type dMs in WD+dM pairs and late-type field dMs to be due to a decrease in sensitivity in close binary companions (or stellar rotation), which has implications for the nature of magnetic activity in fully convective stars. Using the WD components of the pairs, we find WD cooling ages to use as an additional constraint on the age-activity relation for our sample. We find that, on average, active early-type dMs tend to be younger and that active late-type dMs span a much broader age regime making them indistinguishable from the inactive late-type population. We also show that magnetic strength, as measured by H{alpha}, is comparable between paired and field M dwarfs until a spectral type of M6/M7 where M dwarf activity for stars with close companions becomes much stronger. In addition, we present 37 very close candidate pairs with fast-moving orbits that display radial velocity changes over hour timescales.

Morgan, Dylan P.; West, Andrew A.; Dhital, Saurav; Fuchs, Miriam [Astronomy Department, Boston University, 725 Commonwealth Avenue, Boston, MA 02215 (United States); Garces, Ane [Institut de Ciencies de l'Espai (IEEC-CSIC), Facultat de Ciencies, Campus UAB, E-08193 Bellaterra (Spain); Catalan, Silvia [Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield AL10 AB (United Kingdom); Silvestri, Nicole M., E-mail: dpmorg@bu.edu [Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195 (United States)

2012-10-01T23:59:59.000Z

58

SATB1 packages densely-looped, transciptionally-active chromatin for coordinated expression of cytokine genes  

E-Print Network (OSTI)

T. Loss of silent- chromatin looping and impaired imprintingT. SATB1 targets chromatin remodelling to regulate genesS.T. & Fisher, A.G. Chromatin structure and gene regulation

Cai, Shutao; Lee, Charles C.; Kohwi-Shigematsu, Terumi

2006-01-01T23:59:59.000Z

59

Loop Equation in Turbulence  

E-Print Network (OSTI)

The incompressible fluid dynamics is reformulated as dynamics of closed loops $C$ in coordinate space. This formulation allows to derive explicit functional equation for the generating functional $\\Psi[C]$ in inertial range of spatial scales, which allows the scaling solutions. The requirement of finite energy dissipation rate leads then to the Kolmogorov index. We find an exact steady solution of the loop equation in inertial range of the loop sizes. The generating functional decreases as $\\EXP{-A^{\\tt}}$ where $A=\\oint_C r \\wedge dr$ is the area inside the loop. The pdf for the velocity circulation $\\Gamma$ is Lorentzian, with the width $\\bar{\\Gamma} \\propto A^{\\tt} $.

Alexander A. Migdal

1993-03-23T23:59:59.000Z

60

Diode-pumped caesium vapour laser with closed-cycle laser-active medium circulation  

SciTech Connect

The creation of a caesium vapour laser with closed-cycle circulation of the laser-active medium is first reported. The power of the laser radiation amounted to {approx}1 kW with the 'light-to-light' conversion efficiency of {approx}48 %. Quasi-two-dimensional computational model of the laser operation that provides adequate description of experimental results is considered. Calculated and experimental dependences of the laser radiation power on the temperature of the cuvette walls, laser medium pressure and pump power are presented.

Bogachev, A V; Garanin, Sergey G; Dudov, A M; Eroshenko, V A; Kulikov, S M; Mikaelian, G T; Panarin, V A; Pautov, V O; Rus, A V; Sukharev, Stanislav A

2012-02-28T23:59:59.000Z

Note: This page contains sample records for the topic "active closed loop" 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

Loop-to-loop coupling.  

Science Conference Proceedings (OSTI)

This report estimates inductively-coupled energy to a low-impedance load in a loop-to-loop arrangement. Both analytical models and full-wave numerical simulations are used and the resulting fields, coupled powers and energies are compared. The energies are simply estimated from the coupled powers through approximations to the energy theorem. The transmitter loop is taken to be either a circular geometry or a rectangular-loop (stripline-type) geometry that was used in an experimental setup. Simple magnetic field models are constructed and used to estimate the mutual inductance to the receiving loop, which is taken to be circular with one or several turns. Circuit elements are estimated and used to determine the coupled current and power (an equivalent antenna picture is also given). These results are compared to an electromagnetic simulation of the transmitter geometry. Simple approximate relations are also given to estimate coupled energy from the power. The effect of additional loads in the form of attached leads, forming transmission lines, are considered. The results are summarized in a set of susceptibility-type curves. Finally, we also consider drives to the cables themselves and the resulting common-to-differential mode currents in the load.

Warne, Larry Kevin; Lucero, Larry Martin; Langston, William L.; Salazar, Robert Austin; Coleman, Phillip Dale; Basilio, Lorena I.; Bacon, Larry Donald

2012-05-01T23:59:59.000Z

62

Novel Reactor Design for Solid Fuel Chemical Looping Combustion  

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

for Solid Fuel Chemical Looping Combustion Opportunity Research is active on the patent pending technology, titled "Apparatus and Method for Solid Fuel Chemical Looping...

63

High-temperature helium-loop facility  

Science Conference Proceedings (OSTI)

The high-temperature helium loop is a facility for materials testing in ultrapure helium gas at high temperatures. The closed loop system is capable of recirculating high-purity helium or helium with controlled impurities. The gas loop maximum operating conditions are as follows: 300 psi pressure, 500 lb/h flow rate, and 2100/sup 0/F temperature. The two test sections can accept samples up to 3.5 in. diameter and 5 ft long. The gas loop is fully instrumented to continuously monitor all parameters of loop operation as well as helium impurities. The loop is fully automated to operate continuously and requires only a daily servicing by a qualified operator to replenish recorder charts and helium makeup gas. Because of its versatility and high degree of parameter control, the helium loop is applicable to many types of materials research. This report describes the test apparatus, operating parameters, peripheral systems, and instrumentation system.

Tokarz, R.D.

1981-09-01T23:59:59.000Z

64

Fast flux locked loop  

DOE Patents (OSTI)

A flux locked loop for providing an electrical feedback signal, the flux locked loop employing radio-frequency components and technology to extend the flux modulation frequency and tracking loop bandwidth. The flux locked loop of the present invention has particularly useful application in read-out electronics for DC SQUID magnetic measurement systems, in which case the electrical signal output by the flux locked loop represents an unknown magnetic flux applied to the DC SQUID.

Ganther, Jr., Kenneth R. (Olathe, KS); Snapp, Lowell D. (Independence, MO)

2002-09-10T23:59:59.000Z

65

Covariant Closed String Coherent States  

Science Conference Proceedings (OSTI)

We give the first construction of covariant coherent closed string states, which may be identified with fundamental cosmic strings. We outline the requirements for a string state to describe a cosmic string, and provide an explicit and simple map that relates three different descriptions: classical strings, light cone gauge quantum states, and covariant vertex operators. The resulting coherent state vertex operators have a classical interpretation and are in one-to-one correspondence with arbitrary classical closed string loops.

Hindmarsh, Mark; Skliros, Dimitri [Department of Physics and Astronomy, University of Sussex, Brighton, East Sussex BN1 9QH (United Kingdom)

2011-02-25T23:59:59.000Z

66

Pausing and activating thread state upon pin assertion by external logic monitoring polling loop exit time condition  

DOE Patents (OSTI)

A system and method for enhancing performance of a computer which includes a computer system including a data storage device. The computer system includes a program stored in the data storage device and steps of the program are executed by a processer. The processor processes instructions from the program. A wait state in the processor waits for receiving specified data. A thread in the processor has a pause state wherein the processor waits for specified data. A pin in the processor initiates a return to an active state from the pause state for the thread. A logic circuit is external to the processor, and the logic circuit is configured to detect a specified condition. The pin initiates a return to the active state of the thread when the specified condition is detected using the logic circuit.

Chen, Dong; Giampapa, Mark; Heidelberger, Philip; Ohmacht, Martin; Satterfield, David L; Steinmacher-Burow, Burkhard; Sugavanam, Krishnan

2013-05-21T23:59:59.000Z

67

Software: LoopDA  

Science Conference Proceedings (OSTI)

... The method employed is based largely upon the Loop Equation Design Method that provides for sizing of openings to utilize driving wind and stack ...

2013-03-18T23:59:59.000Z

68

Loose Loops Sink Chips  

E-Print Network (OSTI)

This paper explores the concept of micro-architectural loops and discusses their impact on processor pipelines. In particular, we establish the relationship between loose loops and pipeline length and configuration, and show their impact on performance. We then evaluate the load resolution loop in detail and propose the distributed register algorithm (DRA) as a way of reducing this loop. It decreases the performance loss due to load mis-speculations by reducing the issue-to-execute latency in the pipeline. A new loose loop is introduced into the pipeline by the DRA, but the frequency of mis-speculations is very low. The reduction in latency from issue to execute, along with a low mis-speculation rate in the DRA result in up to a 4% to 15% improvement in performance using a detailed architectural simulator.

Eric Borch Intel; Eric Borch; Eric Tune; Srilatha Manne; Joel Emer

2002-01-01T23:59:59.000Z

69

Loose loops sink chips  

E-Print Network (OSTI)

This paper explores the concept of micro-architectural loops and discusses their impact on processor pipelines. In particular, we establish the relationship between loose loops and pipeline length and configuration, and show their impact on performance. We then evaluate the load resolution loop in detail and propose the distributed register algorithm (DRA) as a way of reducing this loop. It decreases the performance loss due to load mis-speculations by reducing the issue-to-execute latency in the pipeline. A new loose loop is introduced into the pipeline by the DRA, but the frequency of mis-speculations is very low. The reduction in latency from issue to execute, along with a low mis-speculation rate in the DRA result in up to a 4 % to 15% improvement in performance using a detailed architectural simulator. 1

Eric Borch; Eric Tune; Srilatha Manne; Joel Emer; Stage N

2002-01-01T23:59:59.000Z

70

flow_loop.indd  

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

FLOW ASSURANCE TEST LOOP FLOW ASSURANCE TEST LOOP Objective O ver a decade ago, RMOTC began cooperatively building a full-scale facility to test new fl ow assurance technology, mainly in the areas of hydrates and paraffi ns. Today, RMOTC's test facility consists of fi ve individual loop sections, including chilling and heated pipe-in-pipe water sections, bare lines, and a mixing section. The facility was designed to represent typical deepwater production systems in order to simulate full-scale tests and apply the results to fl ow assurance fi eld applications and technology. The current facility design consists of a 6" x 3,600 maximum allowable operating pressure test pipeline in fi ve separate loops. The test loops begin and ter- minate at a central location just north

71

Energy Savings Calculator for Commercial Boilers: Closed Loop...  

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

purchase? unit(s) Performance Factors Existing What is the capacity of the existing boiler? MBtuhr* What is the thermal efficiency of the existing boiler? % Et New What is the...

72

Open versus closed loop capacity equilibria in electricity markets ...  

E-Print Network (OSTI)

first used to represent short-run bidding and production games among power ...... capacity is dispatchable thermal plant and there is no significant storage (e.g.,.

73

Closed-Loop Manufacturing of Complex Micro Optics  

Science Conference Proceedings (OSTI)

... quality aluminum test cylinders for the new calculable capacitor being developed ... sensors and confocal pens integrated with ultra-precision turning ...

2012-12-21T23:59:59.000Z

74

Closed Loop Control Techniques for the Growth of Single Crystal ...  

Science Conference Proceedings (OSTI)

through the use of the heat of fusion as an internal ..... furnace, the predominant heat transfer mode is emissive. .... The cubic structure is apparent in the cross-.

75

Film cooling for a closed loop cooled airfoil  

DOE Patents (OSTI)

Turbine stator vane segments have radially inner and outer walls with vanes extending therebetween. The inner and outer walls are compartmentalized and have impingement plates. Steam flowing into the outer wall plenum passes through the impingement plate for impingement cooling of the outer wall upper surface. The spent impingement steam flows into cavities of the vane having inserts for impingement cooling the walls of the vane. The steam passes into the inner wall and through the impingement plate for impingement cooling of the inner wall surface and for return through return cavities having inserts for impingement cooling of the vane surfaces. At least one film cooling hole is defined through a wall of at least one of the cavities for flow communication between an interior of the cavity and an exterior of the vane. The film cooling hole(s) are defined adjacent a potential low LCF life region, so that cooling medium that bleeds out through the film cooling hole(s) reduces a thermal gradient in a vicinity thereof, thereby the increase the LCF life of that region.

Burdgick, Steven Sebastian (Schenectady, NY); Yu, Yufeng Phillip (Simpsonville, SC); Itzel, Gary Michael (Simpsonville, SC)

2003-01-01T23:59:59.000Z

76

CNCC Craig Campus Geothermal Program: 82-well closed loop GHP...  

Open Energy Info (EERE)

campus. The primary component in this campus approach is the common GHP well field ground heat exchanger (GHEX). The innovative design of the shared well field will demonstrate...

77

PGM Recycling from Catalysts in a Closed Hydrometallurgical Loop ...  

Science Conference Proceedings (OSTI)

ISASMELT™ for Recycling of Valuable Elements Contributing to a More Sustainable Society · Leaching of Uranium and Vanadium from Korean Domestic Ore.

78

Heliostat System with Wireless Closed-Loop Control (Fact Sheet)  

SciTech Connect

Thermata is one of the 2012 SunShot CSP R&D awardees for their advanced collectors. This fact sheet explains the motivation, description, and impact of the project.

Not Available

2012-09-01T23:59:59.000Z

79

In situ conversion process utilizing a closed loop heating system  

Science Conference Proceedings (OSTI)

An in situ conversion system for producing hydrocarbons from a subsurface formation is described. The system includes a plurality of u-shaped wellbores in the formation. Piping is positioned in at least two of the u-shaped wellbores. A fluid circulation system is coupled to the piping. The fluid circulation system is configured to circulate hot heat transfer fluid through at least a portion of the piping to form at least one heated portion of the formation. An electrical power supply is configured to provide electrical current to at least a portion of the piping located below an overburden in the formation to resistively heat at least a portion of the piping. Heat transfers from the piping to the formation.

Sandberg, Chester Ledlie (Palo Alto, CA); Fowler, Thomas David (Houston, TX); Vinegar, Harold J. (Bellaire, TX); Schoeber, Willen Jan Antoon Henri (Houston, TX)

2009-08-18T23:59:59.000Z

80

Isotropic Sequence Order Learning in a Closed Loop Behavioural System  

E-Print Network (OSTI)

¥ and ¥ S shown in a). Weights increase for V`Yba and decrease for Vdcda (which means that a sequence of events §eSgf

Porr, Bernd

Note: This page contains sample records for the topic "active closed loop" 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

Closed loop pulsating heat pipes Part A: parametric experimental investigations  

E-Print Network (OSTI)

(constant vol- ume), two-phase, bubble­liquid slug system formed inside the tube-bundle due to the dominance of surface tension forces. This tube-bundle receives heat at one end and is cooled at the other. Temperature-hydrodynamic coupling of pressure/temperature fluctuations with the void fraction (mal-) distribution. This causes heat

Khandekar, Sameer

82

Off-Criticality and the Massive Brownian Loop Soup  

E-Print Network (OSTI)

The Brownian loop soup is a conformally invariant Poissonian ensemble of loops in the plane recently introduced by Lawler and Werner. It has attracted significant attention for its connection to the Schramm-Loewner Evolution and Conformal Loop Ensembles and its consequent ability to describe the critical scaling limit of two-dimensional statistical mechanical models. In this paper, we introduce a natural "massive" (non-scale-invariant) version of the Brownian loop soup as a candidate to describe near-critical scaling limits, and study some of its properties, such as conformal covariance, exponential decay of correlations, and Hausdorff dimension. We also show that the massive Brownian loop soup arises as the near-critical scaling limit of a "gas" of random walk loops which is closely related to the discrete Gaussian free field.

Federico Camia

2013-09-24T23:59:59.000Z

83

Chemical Looping Air Separation Unit and Methods of Use  

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

Looping Air Separation Unit and Methods of Use Looping Air Separation Unit and Methods of Use Contact NETL Technology Transfer Group techtransfer@netl.doe.gov October 2012 Opportunity Research is currently active on the patent-pending technology "Chemical Looping Air Separation Unit and Methods of Use" that combines the best attributes of chemical looping and oxy-fuel combustion technologies. Following patent approval, the technology will be available for licensing and/or further collaborative research from the U.S. Department of Energy's National Energy Technology Laboratory. Significance * Combines chemical looping and oxy-fuel technologies * Separates oxygen from air at high efficiencies * Removes CO

84

Wireless Local Loop  

Science Conference Proceedings (OSTI)

Wireless local loop systems are available to provide both broadband and narrowband services to customers. Narrowband systems are generally either based on cordless or mobile standards, or a manufacturer‘s proprietary technology. They are generally ...

R. P. Merrett; P. V. E. Beastall; S. J. Buttery

1998-10-01T23:59:59.000Z

85

Water-Loop Heat Pump Systems: Assessment Study Update  

Science Conference Proceedings (OSTI)

Water-loop heat pump systems, composed of multiple water-source heat pumps, a boiler, and a cooling tower operating in a closed water loop are a key segment of the commercial building heat pump market. This type of system provides a low-first-cost, versatile, and energy-efficient approach to space conditioning commercial buildings that have simultaneous heating and cooling loads.

1991-10-25T23:59:59.000Z

86

COLD TEST LOOP INTEGRATED TEST LOOP RESULTS  

Science Conference Proceedings (OSTI)

A testing facility (Cold Test Loop) was constructed and operated to demonstrate the efficacy of the Accelerated Waste Retrieval (AWR) Project's planned sluicing approach to the remediation of Silos 1 and 2 at the Fernald Environmental Management Project near Cincinnati, Ohio. The two silos contain almost 10,000 tons of radium-bearing low-level waste, which consists primarily of solids of raffinates from processing performed on ores from the Democratic Republic of Congo (commonly referred to as ''Belgium Congo ores'') for the recovery of uranium. These silos are 80 ft in diameter, 36 ft high to the center of the dome, and 26.75 ft to the top of the vertical side walls. The test facility contained two test systems, each designed for a specific purpose. The first system, the Integrated Test Loop (ITL), a near-full-scale plant including the actual equipment to be installed at the Fernald Site, was designed to demonstrate the sluicing operation and confirm the selection of a slurry pump, the optimal sluicing nozzle operation, and the preliminary design material balance. The second system, the Component Test Loop (CTL), was designed to evaluate many of the key individual components of the waste retrieval system over an extended run. The major results of the initial testing performed during July and August 2002 confirmed that the AWR approach to sluicing was feasible. The ITL testing confirmed the following: (1) The selected slurry pump (Hazleton 3-20 type SHW) performed well and is suitable for AWR application. However, the pump's motor should be upgraded to a 200-hp model and be driven by a 150-hp variable-frequency drive (VFD). A 200-hp VFD is not much more expensive and would allow the pump to operate at full speed. (2) The best nozzle performance was achieved by using 15/16-in. nozzles operated alternately. This configuration appeared to most effectively mine the surrogate. (3) The Solartron densitometer, which was tested as an alternative mass flow measurement device, did not operate effectively. Consequently, it is not suitable for application to the AWR process. (4) Initially, the spray ring (operated at approximately 2300 psi) and the nozzles provided by the pump vendor did not perform acceptably. The nozzles were replaced with a more robust model, and the performance was then acceptable. (5) The average solids concentration achieved in the slurry before Bentogrout addition was approximately 16% by weight. The solids concentration of the slurry after Bentogrout addition ranged from 26% to approximately 40%. The slurry pump and ITL system performed well at every concentration. No line plugging or other problems were noted. The results of the CTL runs and later ITL testing are summarized in an appendix to this report.

Abraham, TJ

2003-10-22T23:59:59.000Z

87

Hybrid Combustion-Gasification Chemical Looping  

DOE Green Energy (OSTI)

For the past several years Alstom Power Inc. (Alstom), a leading world-wide power system manufacturer and supplier, has been in the initial stages of developing an entirely new, ultra-clean, low cost, high efficiency power plant for the global power market. This new power plant concept is based on a hybrid combustion-gasification process utilizing high temperature chemical and thermal looping technology The process consists of the oxidation, reduction, carbonation, and calcination of calcium-based compounds, which chemically react with coal, biomass, or opportunity fuels in two chemical loops and one thermal loop. The chemical and thermal looping technology can be alternatively configured as (i) a combustion-based steam power plant with CO{sub 2} capture, (ii) a hybrid combustion-gasification process producing a syngas for gas turbines or fuel cells, or (iii) an integrated hybrid combustion-gasification process producing hydrogen for gas turbines, fuel cells or other hydrogen based applications while also producing a separate stream of CO{sub 2} for use or sequestration. In its most advanced configuration, this new concept offers the promise to become the technology link from today's Rankine cycle steam power plants to tomorrow's advanced energy plants. The objective of this work is to develop and verify the high temperature chemical and thermal looping process concept at a small-scale pilot facility in order to enable AL to design, construct and demonstrate a pre-commercial, prototype version of this advanced system. In support of this objective, Alstom and DOE started a multi-year program, under this contract. Before the contract started, in a preliminary phase (Phase 0) Alstom funded and built the required small-scale pilot facility (Process Development Unit, PDU) at its Power Plant Laboratories in Windsor, Connecticut. Construction was completed in calendar year 2003. The objective for Phase I was to develop the indirect combustion loop with CO{sub 2} separation, and also syngas production from coal with the calcium sulfide (CaS)/calcium sulfate (CaSO{sub 4}) loop utilizing the PDU facility. The results of Phase I were reported in Reference 1, 'Hybrid Combustion-Gasification Chemical Looping Coal Power Development Technology Development Phase I Report' The objective for Phase II was to develop the carbonate loop--lime (CaO)/calcium carbonate (CaCO{sub 3}) loop, integrate it with the gasification loop from Phase I, and ultimately demonstrate the feasibility of hydrogen production from the combined loops. The results of this program were reported in Reference 3, 'Hybrid Combustion-Gasification Chemical Looping Coal Power Development Technology Development Phase II Report'. The objective of Phase III is to operate the pilot plant to obtain enough engineering information to design a prototype of the commercial Chemical Looping concept. The activities include modifications to the Phase II Chemical Looping PDU, solids transportation studies, control and instrumentation studies and additional cold flow modeling. The deliverable is a report making recommendations for preliminary design guidelines for the prototype plant, results from the pilot plant testing and an update of the commercial plant economic estimates.

Herbert Andrus; Gregory Burns; John Chiu; Gregory Lijedahl; Peter Stromberg; Paul Thibeault

2009-01-07T23:59:59.000Z

88

Time-Constrained Loop Pipelining  

Science Conference Proceedings (OSTI)

This paper addresses the problem of Time-Constrained Loop Pipelining, i.e. given a fixed throughput, finding a schedule of a loop which minimizes resource requirements. This paper proposes a methodology, called TCLP, based on dividing the problem into ... Keywords: loop pipelining, scheduling, timing and resource contraints, register optimization

Fermin Sanchez

1995-12-01T23:59:59.000Z

89

Lectures on loop gravity  

E-Print Network (OSTI)

This is the first version of the introductory lectures on loop quantum gravity that I will give at the quantum gravity school in Zakopane. The theory is presented in self-contained form, without emphasis on its derivation from classical general relativity. Dynamics is given in the covariant form. The approximations needed to compute physical quantities are discussed. Some applications are described, including the recent derivation of de Sitter cosmology from full quantum gravity.

Rovelli, Carlo

2011-01-01T23:59:59.000Z

90

Closed orbit feedback with digital signal processing  

SciTech Connect

The closed orbit feedback experiment conducted on the SPEAR using the singular value decomposition (SVD) technique and digital signal processing (DSP) is presented. The beam response matrix, defined as beam motion at beam position monitor (BPM) locations per unit kick by corrector magnets, was measured and then analyzed using SVD. Ten BPMs, sixteen correctors, and the eight largest SVD eigenvalues were used for closed orbit correction. The maximum sampling frequency for the closed loop feedback was measured at 37 Hz. Using the proportional and integral (PI) control algorithm with the gains Kp = 3 and K{sub I} = 0.05 and the open-loop bandwidth corresponding to 1% of the sampling frequency, a correction bandwidth ({minus}3 dB) of approximately 0.8 Hz was achieved. Time domain measurements showed that the response time of the closed loop feedback system for 1/e decay was approximately 0.25 second. This result implies {approximately} 100 Hz correction bandwidth for the planned beam position feedback system for the Advanced Photon Source storage ring with the projected 4-kHz sampling frequency.

Chung, Y.; Kirchman, J.; Lenkszus, F. [and others

1994-08-01T23:59:59.000Z

91

Molten salt test loop  

DOE Green Energy (OSTI)

The objective of the Molten Salt Test Loop Project was to design, construct, and demonstrate operation of an outdoor high temperature molten salt test facility. This facility is operational, and can now be used to evaluate materials and components, and the design features and operating procedures required for molten salt heat transport systems. The initial application of the loop was to demonstrate the feasibility of using molten salt as the heat transport medium for a high temperature distributed collector system. A commercially available eutectic salt blend is used as the heat transfer fluid. This salt has a composition of 40% NaNO/sub 2/, 7% NaNO/sub 3/, and 53% KNO/sub 3/ and is marketed under the trade name Hitec. It has a freezing (solidifying) point of 142/sup 0/C (288/sup 0/F) and has been satisfactorily used at temperatures as high as 594/sup 0/C (1100/sup 0/F). General Atomic (GA) installed a row of Fixed Mirror Solar Concentrators (FMSC's) in the loop. The system was started up and a test program conducted. Startup went smoothly, with the exception of some burned-out trace heaters. Salt temperatures as high as 571/sup 0/C (1060/sup 0/F) were achieved.

Schuster, J.R.; Eggers, G.H.

1980-01-01T23:59:59.000Z

92

Powers of Elements in Jordan Loops  

E-Print Network (OSTI)

A Jordan loop is a commutative loop satisfying the Jordan identity $(x^2 y) x = x^2 (y x)$. We establish several identities involving powers in Jordan loops and show that there is no nonassociative Jordan loop of order $9$.

Pula, Kyle

2010-01-01T23:59:59.000Z

93

Coupled dual loop absorption heat pump  

DOE Patents (OSTI)

A coupled dual loop absorption system which utilizes two separate complete loops. Each individual loop operates at three temperatures and two pressures. This low temperature loop absorber and condenser are thermally coupled to the high temperature loop evaporator, and the high temperature loop condenser and absorber are thermally coupled to the low temperature generator.

Sarkisian, Paul H. (Watertown, MA); Reimann, Robert C. (Lafayette, NY); Biermann, Wendell J. (Fayetteville, NY)

1985-01-01T23:59:59.000Z

94

REACTOR MAIN COOLANT LOOP  

SciTech Connect

A parametric study was made for the POPR with temperature gradients of 610 to 670 deg F and 6l0 to 684.5 deg F at organic flow rates of 17.8 x l0/sup 6/ and l4.4 x l0/sup 6/ lbs/hr, respectively; and steam turbine conditions at the throttle of 600 and 650 deg F at 800 to l200 psig. The study was made to obtain the most economical layout of the main heat transfer loop system. (B.O.G.)

Terpe, G.R.; Katz, B.

1961-08-01T23:59:59.000Z

95

Topological interactions between ring polymers: Implications for chromatin loops  

E-Print Network (OSTI)

Chromatin looping is a major epigenetic regulatory mechanism in higher eukaryotes. Besides its role in transcriptional regulation, chromatin loops have been proposed to play a pivotal role in the segregation of entire chromosomes. The detailed topological and entropic forces between loops still remain elusive. Here, we quantitatively determine the potential of mean force between the centers of mass of two ring polymers, i.e. loops. We find that the transition from a linear to a ring polymer induces a strong increase in the entropic repulsion between these two polymers. On top, topological interactions such as the non-catenation constraint further reduce the number of accessible conformations of close-by ring polymers by about 50%, resulting in an additional effective repulsion. Furthermore, the transition from linear to ring polymers displays changes in the conformational and structural properties of the system. In fact, ring polymers adopt a markedly more ordered and aligned state than linear ones. The force...

Bohn, Manfred

2010-01-01T23:59:59.000Z

96

Loop Current Response to Hurricanes Isidore and Lili  

Science Conference Proceedings (OSTI)

Recent hurricane activity over the Gulf of Mexico basin has underscored the importance of the Loop Current (LC) and its deep, warm thermal structure on hurricane intensity. During Hurricanes Isidore and Lili in 2002, research flights were ...

Lynn K. Shay; Eric W. Uhlhorn

2008-09-01T23:59:59.000Z

97

Uranyl Nitrate Flow Loop  

Science Conference Proceedings (OSTI)

The objectives of the work discussed in this report were to: (1) develop a flow loop that would simulate the purified uranium-bearing aqueous stream exiting the solvent extraction process in a natural uranium conversion plant (NUCP); (2) develop a test plan that would simulate normal operation and disturbances that could be anticipated in an NUCP; (3) use the flow loop to test commercially available flowmeters for use as safeguards monitors; and (4) recommend a flowmeter for production-scale testing at an NUCP. There has been interest in safeguarding conversion plants because the intermediate products [uranium dioxide (UO{sub 2}), uranium tetrafluoride (UF{sub 4}), and uranium hexafluoride (UF{sub 6})] are all suitable uranium feedstocks for producing special nuclear materials. Furthermore, if safeguards are not applied virtually any nuclear weapons program can obtain these feedstocks without detection by the International Atomic Energy Agency (IAEA). Historically, IAEA had not implemented safeguards until the purified UF{sub 6} product was declared as feedstock for enrichment plants. H. A. Elayat et al. provide a basic definition of a safeguards system: 'The function of a safeguards system on a chemical conversion plant is in general terms to verify that no useful nuclear material is being diverted to use in a nuclear weapons program'. The IAEA now considers all highly purified uranium compounds as candidates for safeguarding. DOE is currently interested in 'developing instruments, tools, strategies, and methods that could be of use to the IAEA in the application of safeguards' for materials found in the front end of the nuclear fuel cycle-prior to the production of the uranium hexafluoride or oxides that have been the traditional starting point for IAEA safeguards. Several national laboratories, including Oak Ridge, Los Alamos, Lawrence Livermore, and Brookhaven, have been involved in developing tools or techniques for safeguarding conversion plants. This study was sponsored by the U.S. Department of Energy (DOE) NA-241, Office of Dismantlement and Transparency.

Ladd-Lively, Jennifer L [ORNL

2008-10-01T23:59:59.000Z

98

On the Green's function and iterative solutions of Loop Quantum Cosmology  

E-Print Network (OSTI)

Here we shall find the green's function of the difference equation of loop quantum cosmology. To illustrate how to use it, we shall obtain an iterative solution for closed model and evaluate its corresponding Bohmian trajectory.

Fatimah Shojai; Ali Shojai

2006-07-09T23:59:59.000Z

99

Chemical Looping | Open Energy Information  

Open Energy Info (EERE)

Looping Looping Jump to: navigation, search Contents 1 Introduction 2 Process Description 3 Benefits 4 Oxygen Carriers 5 Multimedia 6 Patents 7 References 8 External Links Introduction Chemical looping or chemical looping combustion (CLC) is a novel technology that could provide the means to convert fossil fuels to electricity and provide carbon capture without significant efficiency or cost penalties. Chemical looping combustion is very similar to oxy-fuel combustion where there is no direct contact between air and fuel.[1] Oxygen is extracted from air, then the oxygen is reacted with the hydrocarbon fuel producing an exhaust gas composed of carbon dioxide and water vapor.[2] The water vapor is condensed out of the gas resulting in near 100% carbon dioxide stream that could be sequestered in the ground.

100

NIST Gaithersburg: Closed  

Science Conference Proceedings (OSTI)

NIST Gaithersburg Closed Due to Inclement Weather. For Immediate Release: March 6, 2013. *. Bookmark and Share. Contact ...

2013-03-07T23:59:59.000Z

Note: This page contains sample records for the topic "active closed loop" 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

Fusion of Loops for Parallelism and Locality  

Science Conference Proceedings (OSTI)

AbstractżLoop fusion improves data locality and reduces synchronization in data-parallel applications. However, loop fusion is not always legal. Even when legal, fusion may introduce loop-carried dependences which prevent parallelism. In addition, performance ... Keywords: Locality enhancement, loop fusion, cache conflicts, loop transformations, data-parallel applications, scalable shared-memory multiprocessors.

Naraig Manjikian; Tarek S. Abdelrahman

1997-02-01T23:59:59.000Z

102

Loop-deformed Poincaré algebra  

E-Print Network (OSTI)

In this essay we present evidence suggesting that loop quantum gravity leads to deformation of the local Poincar\\'e algebra within the limit of high energies. This deformation is a consequence of quantum modification of effective off-shell hypersurface deformation algebra. Surprisingly, the form of deformation suggests that the signature of space-time changes from Lorentzian to Euclidean at large curvatures. We construct particular realization of the loop-deformed Poincar\\'e algebra and find that it can be related to curved momentum space, which indicates the relationship with recently introduced notion of relative locality. The presented findings open a new way of testing loop quantum gravity effects.

Jakub Mielczarek

2013-04-08T23:59:59.000Z

103

Highly Efficient Modeling of Dynamic Coronal Loops  

E-Print Network (OSTI)

Observational and theoretical evidence suggests that coronal heating is impulsive and occurs on very small cross-field spatial scales. A single coronal loop could contain a hundred or more individual strands that are heated quasi-independently by nanoflares. It is therefore an enormous undertaking to model an entire active region or the global corona. Three-dimensional MHD codes have inadequate spatial resolution, and 1D hydro codes are too slow to simulate the many thousands of elemental strands that must be treated in a reasonable representation. Fortunately, thermal conduction and flows tend to smooth out plasma gradients along the magnetic field, so "0D models" are an acceptable alternative. We have developed a highly efficient model called Enthalpy-Based Thermal Evolution of Loops (EBTEL) that accurately describes the evolution of the average temperature, pressure, and density along a coronal strand. It improves significantly upon earlier models of this type--in accuracy, flexibility, and capability. It ...

Klimchuk, J A; Cargill, P J

2007-01-01T23:59:59.000Z

104

The calculus of looping sequences  

Science Conference Proceedings (OSTI)

We describe the Calculus of Looping Sequences (CLS) which is suitable for modeling microbiological systems and their evolution. We present two extensions, CLS with links (LCLS) and Stochastic CLS. LCLS simplifies the description of protein interaction ...

Roberto Barbuti; Giulio Caravagna; Andrea Maggiolo-Schettini; Paolo Milazzo; Giovanni Pardini

2008-06-01T23:59:59.000Z

105

Time-Constrained Loop Pipelining  

E-Print Network (OSTI)

This paper addresses the problem of Time-Constrained Loop Pipelining, i.e. given a fixed throughput, finding a schedule of a loop which minimizes resource requirements. We propose a methodology, called TCLP, based on dividing the problem into two simpler and independent tasks: retiming and scheduling. TCLP explores different sets of resources, searchingfor a maximum resource utilization. This reduces area requirements. After a minimum set of resourceshas been found, the execution throughput is increased and the number of registers required by the loop schedule is reduced. TCLP attempts to generate a schedule which minimizes cost in time and area (resources and registers). The results show that TCLP obtains optimal schedules in most cases. 1 Introduction This paper presents TCLP, a methodology to solve TimeConstrained Loop Pipelining. TCLP is NP-complete [3]. Two types of timing constraints (TCs) have been considered in the literature: local TCs to specify minimum and/or maximum TCs ...

Fermn Sanchez; Jordi Cortadella

1995-01-01T23:59:59.000Z

106

Introduction to Loop Quantum Gravity  

E-Print Network (OSTI)

The questions I have been asked during the 5th International School on Field Theory and Gravitation, have compelled me to give an account of the premises that I consider important for a beginner's approach to Loop Quantum Gravity. After a description of some general arguments and an introduction to the canonical theory of gravity, I review the background independent approach to quantum gravity, giving only a brief survey of Loop Quantum Gravity.

Mercuri, Simone

2010-01-01T23:59:59.000Z

107

Introduction to Loop Quantum Gravity  

E-Print Network (OSTI)

The questions I have been asked during the 5th International School on Field Theory and Gravitation, have compelled me to give an account of the premises that I consider important for a beginner's approach to Loop Quantum Gravity. After a description of some general arguments and an introduction to the canonical theory of gravity, I review the background independent approach to quantum gravity, giving only a brief survey of Loop Quantum Gravity.

Simone Mercuri

2010-01-08T23:59:59.000Z

108

Wilson loops in warped resolved deformed conifolds  

Science Conference Proceedings (OSTI)

We calculate quark-antiquark potentials using the relationship between the expectation value of the Wilson loop and the action of a probe string in the string dual. We review and categorise the possible forms of the dependence of the energy on the separation between the quarks. In particular, we examine the possibility of there being a minimum separation for probe strings which do not penetrate close to the origin of the bulk space, and derive a condition which determines whether this is the case. We then apply these considerations to the flavoured resolved deformed conifold background of Gaillard et al. (2010) . We suggest that the unusual behaviour that we observe in this solution is likely to be related to the IR singularity which is not present in the unflavoured case. - Highlights: > We calculate quark-antiquark potentials using the Wilson loop and the action of a probe string in the string dual. > We review and categorise the possible forms of the dependence of the energy on the separation between the quarks. > We look in particular at the flavoured resolved deformed conifold. > There appears to be unusual behaviour which seems likely to be related to the IR singularity introduced by flavours.

Bennett, Stephen, E-mail: pystephen@swansea.ac.uk

2011-11-15T23:59:59.000Z

109

Free loop spaces in topology and  

E-Print Network (OSTI)

Free loop spaces in topology and physics Kathryn Hess What is the space of free loops? Enumeration of geodesics Hochschild and cyclic homology Homological conformal field theories Free loop spaces in topology Meeting of the Edinburgh Mathematical Society Glasgow, 14 November 2008 #12;Free loop spaces in topology

Thévenaz, Jacques

110

Inductance and near fields of a loop antenna in a cold magnetoplasma in the whistler frequency band  

SciTech Connect

The influence of a magnetoplasma on the inductance of a circular loop antenna oriented perpendicular to the ambient static magnetic field and operated in the whistler frequency band is studied. Based on a strict electrodynamic approach, the analytical treatment of the antenna reactance is performed for a uniform rf current distribution along the antenna wire. Calculations are made for plasma parameters and operating frequencies typical for active ionospheric experiments and laboratory rf (helicon) sources of dense magnetized plasmas. It is shown that the plasma influence on the inductance of the loop antenna remains relatively weak, even for antennas with dimensions close to half of the longitudinal whistler wavelength, when the rf field distribution in the antenna near zone is strongly different from that in vacuum. The theoretical predictions are confirmed by measurements performed on the large KROT plasma device. The results obtained are of crucial importance for the preparation of active ionospheric experiments and for the matching of loop antennas used in laboratory rf sources of dense magnetized plasmas.

Gushchin, M. E.; Korobkov, S. V.; Kostrov, A. V. [Institute of Applied Physics, 603950 Nizhny Novgorod (Russian Federation); Zaboronkova, T. M. [Department of Applied Physics, Technical University of Nizhny Novgorod, 603950 Nizhny Novgorod (Russian Federation); Krafft, C. [Laboratoire de Physique des Plasmas, Ecole Polytechnique, 91128 Palaiseau Cedex, Univ. Paris Sud, 91405 Orsay Cedex (France)

2012-09-15T23:59:59.000Z

111

Topological interactions between ring polymers: Implications for chromatin loops  

E-Print Network (OSTI)

Chromatin looping is a major epigenetic regulatory mechanism in higher eukaryotes. Besides its role in transcriptional regulation, chromatin loops have been proposed to play a pivotal role in the segregation of entire chromosomes. The detailed topological and entropic forces between loops still remain elusive. Here, we quantitatively determine the potential of mean force between the centers of mass of two ring polymers, i.e. loops. We find that the transition from a linear to a ring polymer induces a strong increase in the entropic repulsion between these two polymers. On top, topological interactions such as the non-catenation constraint further reduce the number of accessible conformations of close-by ring polymers by about 50%, resulting in an additional effective repulsion. Furthermore, the transition from linear to ring polymers displays changes in the conformational and structural properties of the system. In fact, ring polymers adopt a markedly more ordered and aligned state than linear ones. The forces and accompanying changes in shape and alignment between ring polymers suggest an important regulatory function of such a topology in biopolymers. We conjecture that dynamic loop formation in chromatin might act as a versatile control mechanism regulating and maintaining different local states of compaction and order.

Manfred Bohn; Dieter W. Heermann

2010-01-24T23:59:59.000Z

112

Pomona Loop Baseline Performance Testing.PDF  

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

Pomona Loop Baseline Performance Testing Summary Pomona Loop Baseline Performance Testing Summary The U.S. Department of Energy's Field Operations Program sponsors the Urban and Freeway Pomona Loop range testing in Southern California. The testing is performed by one of the Program's testing partners, Southern California Edison. The vehicles are tested on local city streets (Urban Loop) and four highways (Freeway Loop). The Urban Loop is 19.3 miles long, ranging in elevation from 900 to 1500 feet, with approximately 50 stop signs and traffic lights. The Freeway Loop is 37.2 miles long, ranging in elevation from 700 to 1150 feet, and consists of four connected freeways shaped like a rectangle. When a vehicle is Pomona Loop tested, eight range tests are performed, with four tests on the Urban Loop and four on the Freeway Loop. The range tests are performed

113

Geometric and Electronic Structure of Closed Graphene Edges  

SciTech Connect

We report theoretical and experimental results on single and multiple looped graphene sheets. Experimental images of stable closed-edge structures in few-layer graphene samples obtained by high-resolution transmission electron microscopy (HRTEM) are compared with first- principles density functional theory calculations. We demonstrate that the electronic structure of a graphene nanoribbon is not significantly perturbed upon closing. By contrast, a significant modulation of the electronic structure is observed for closed-edge graphene structures deposited on a planar graphene substrate. This effect is due to an enhanced reactivity of the looped (coalesced) edges observed experimentally. The coexistence of different degrees of curvature in the graphene sheet induced by folding indicates that these materials could be used for surface chemistry engineering.

Lopez-Benzanilla, Alejandro [Oak Ridge National Laboratory (ORNL); Campos-Delgado, Jessica [IPICyT; Sumpter, Bobby G [ORNL; Baptista, Daniel [National Institute of Metrology, Duque de Caxias, Brazil; Hayashi, Takuya [Institute of Carbon Science and Technology, Shinshu Unversity; Kim, Y A [Shinshu University; Muramatsu, H [Shinshu University; Endo, M [Shinshu University; Achete, Carlos [National Institute of Metrology, Duque de Caxias, Brazil; Terrones, M. [Universidad Carlos III, Madrid, Spain; Meunier, Vincent [ORNL

2012-01-01T23:59:59.000Z

114

Loop Current and Deep Eddies  

Science Conference Proceedings (OSTI)

In contrast to the Loop Current and rings, much less is known about deep eddies (deeper than 1000 m) of the Gulf of Mexico. In this paper, results from a high-resolution numerical model of the Gulf are analyzed to explain their origin and how ...

L-Y. Oey

2008-07-01T23:59:59.000Z

115

Similarities and Differences between Coronal Holes and the Quiet Sun: Are Loop Statistics the Key?  

E-Print Network (OSTI)

Coronal holes (CH) emit significantly less at coronal temperatures than quiet-Sun regions (QS), but can hardly be distinguished in most chromospheric and lower transition region lines. A key quantity for the understanding of this phenomenon is the magnetic field. We use data from SOHO/MDI to reconstruct the magnetic field in coronal holes and the quiet Sun with the help of a potential magnetic model. Starting from a regular grid on the solar surface we then trace field lines, which provide the overall geometry of the 3D magnetic field structure. We distinguish between open and closed field lines, with the closed field lines being assumed to represent magnetic loops. We then try to compute some properties of coronal loops. The loops in the coronal holes (CH) are found to be on average flatter than in the QS. High and long closed loops are extremely rare, whereas short and low-lying loops are almost as abundant in coronal holes as in the quiet Sun. When interpreted in the light of loop scaling laws this result suggests an explanation for the relatively strong chromospheric and transition region emission (many low-lying, short loops), but the weak coronal emission (few high and long loops) in coronal holes. In spite of this contrast our calculations also suggest that a significant fraction of the cool emission in CHs comes from the open flux regions. Despite these insights provided by the magnetic field line statistics further work is needed to obtain a definite answer to the question if loop statistics explain the differences between coronal holes and the quiet Sun.

T. Wiegelmann; S. K. Solanki

2008-02-01T23:59:59.000Z

116

The integration of water loop heat pump and building structural thermal storage systems  

SciTech Connect

Many commercial buildings need heat in one part and, at the same time, cooling in another part. Even more common is the need for heating during one part of the day and cooling during another in the same spaces. If that energy could be shifted or stored for later use, significant energy might be saved. If a building's heating and cooling subsystems could be integrated with the building's structural mass and used to collect, store, and deliver energy, the energy might be save cost-effectively. To explore this opportunity, researchers at the Pacific Northwest Laboratory (PNL) examined the thermal interactions between the heating, ventilating, and air-conditioning (HVAC) system and the structure of a commercial building. Computer models were developed to simulate the interactions in an existing building located in Seattle, Washington, to determine how these building subsystems could be integrated to improve energy efficiency. The HVAC subsystems in the existing building were modeled. These subsystems consist of decentralized water-source heat pumps (WSHP) in a closed water loop, connected to cooling towers for heat rejection during cooling mode and boilers to augment heating. An initial base case'' computer model of the Seattle building, as-built, was developed. Metered data available for the building were used to calibrate this model to ensure that the analysis would provide information that closely reflected the operation of a real building. The HVAC system and building structure were integrated in the model using the concrete floor slabs as thermal storage media. The slabs may be actively charged during off-peak periods with the chilled water in the loop and then either actively or passively discharged into the conditioned space during peak periods. 21 refs., 37 figs., 17 tabs.

Marseille, T.J.; Schliesing, J.S.

1991-10-01T23:59:59.000Z

117

The integration of water loop heat pump and building structural thermal storage systems  

DOE Green Energy (OSTI)

Many commercial buildings need heat in one part and, at the same time, cooling in another part. Even more common is the need for heating during one part of the day and cooling during another in the same spaces. If that energy could be shifted or stored for later use, significant energy might be saved. If a building's heating and cooling subsystems could be integrated with the building's structural mass and used to collect, store, and deliver energy, the energy might be save cost-effectively. To explore this opportunity, researchers at the Pacific Northwest Laboratory (PNL) examined the thermal interactions between the heating, ventilating, and air-conditioning (HVAC) system and the structure of a commercial building. Computer models were developed to simulate the interactions in an existing building located in Seattle, Washington, to determine how these building subsystems could be integrated to improve energy efficiency. The HVAC subsystems in the existing building were modeled. These subsystems consist of decentralized water-source heat pumps (WSHP) in a closed water loop, connected to cooling towers for heat rejection during cooling mode and boilers to augment heating. An initial base case'' computer model of the Seattle building, as-built, was developed. Metered data available for the building were used to calibrate this model to ensure that the analysis would provide information that closely reflected the operation of a real building. The HVAC system and building structure were integrated in the model using the concrete floor slabs as thermal storage media. The slabs may be actively charged during off-peak periods with the chilled water in the loop and then either actively or passively discharged into the conditioned space during peak periods. 21 refs., 37 figs., 17 tabs.

Marseille, T.J.; Schliesing, J.S.

1991-10-01T23:59:59.000Z

118

Active security  

Science Conference Proceedings (OSTI)

In this paper we introduce active security, a new methodology which introduces programmatic control within a novel feedback loop into the defense infrastructure. Active security implements a unified programming environment which provides interfaces ... Keywords: central management, digital forensics, network security

Ryan Hand, Michael Ton, Eric Keller

2013-11-01T23:59:59.000Z

119

Building Energy Software Tools Directory: Ground Loop Design  

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

Loop Design Ground Loop Design logo Ground Loop Design is a versatile ground source heat pump system design program that helps the trained geothermal HVAC designerengineer...

120

Ideal kink instability of a magnetic loop equilibrium  

E-Print Network (OSTI)

The force-free coronal loop model by Titov & D\\'emoulin (1999} is found to be unstable with respect to the ideal kink mode, which suggests this instability as a mechanism for the initiation of flares. The long-wavelength ($m=1$) mode grows for average twists $\\Phi\\ga3.5\\pi$ (at a loop aspect ratio of $\\approx$ 5). The threshold of instability increases with increasing major loop radius, primarily because the aspect ratio then also increases. Numerically obtained equilibria at subcritical twist are very close to the approximate analytical equilibrium; they do not show indications of sigmoidal shape. The growth of kink perturbations is eventually slowed down by the surrounding potential field, which varies only slowly with radius in the model. With this field a global eruption is not obtained in the ideal MHD limit. Kink perturbations with a rising loop apex lead to the formation of a vertical current sheet below the apex, which does not occur in the cylindrical approximation.

T. Toeroek; B. Kliem; V. S. Titov

2003-11-09T23:59:59.000Z

Note: This page contains sample records for the topic "active closed loop" 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

OBSERVATIONS OF PLASMA UPFLOW IN A WARM LOOP WITH HINODE/EIS  

Science Conference Proceedings (OSTI)

A complete understanding of Doppler shift in active region loops can help probe the basic physical mechanism involved into the heating of those loops. Here, we present observations of upflows in coronal loops detected in a range of temperatures (log T = 5.8-6.2). The loop was not discernible above these temperatures. The speed of upflow was strongest at the footpoint and decreased with height. The upflow speed at the footpoint was about 20 km s{sup -1} in Fe VIII, which decreased with temperature, being about 13 km s{sup -1} in Fe X, about 8 km s{sup -1} in Fe XII, and about 4 km s{sup -1} in Fe XIII. To the best of our knowledge, this is the first observation providing evidence of upflow of plasma in coronal loop structures at these temperatures. We interpret these observations as evidence of chromospheric evaporation in quasi-static coronal loops.

Tripathi, Durgesh [Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411 007 (India); Mason, Helen E.; Del Zanna, Giulio [Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA (United Kingdom); Bradshaw, Steven [Department of Physics and Astronomy, Rice University, Houston, TX 77005 (United States)

2012-07-20T23:59:59.000Z

122

Hard thermal loops in static external fields  

E-Print Network (OSTI)

We study, in the imaginary-time formalism, the high temperature behavior of n-point thermal loops in static Yang-Mills and gravitational fields. We show that in this regime, any hard thermal loop gives the same leading contribution as the one obtained by evaluating the loop at zero external energies and momenta.

Frenkel, J; Takahashi, N

2009-01-01T23:59:59.000Z

123

Highly Efficient Modeling of Dynamic Coronal Loops  

E-Print Network (OSTI)

Observational and theoretical evidence suggests that coronal heating is impulsive and occurs on very small cross-field spatial scales. A single coronal loop could contain a hundred or more individual strands that are heated quasi-independently by nanoflares. It is therefore an enormous undertaking to model an entire active region or the global corona. Three-dimensional MHD codes have inadequate spatial resolution, and 1D hydro codes are too slow to simulate the many thousands of elemental strands that must be treated in a reasonable representation. Fortunately, thermal conduction and flows tend to smooth out plasma gradients along the magnetic field, so "0D models" are an acceptable alternative. We have developed a highly efficient model called Enthalpy-Based Thermal Evolution of Loops (EBTEL) that accurately describes the evolution of the average temperature, pressure, and density along a coronal strand. It improves significantly upon earlier models of this type--in accuracy, flexibility, and capability. It treats both slowly varying and highly impulsive coronal heating; it provides the differential emission measure distribution, DEM(T), at the transition region footpoints; and there are options for heat flux saturation and nonthermal electron beam heating. EBTEL gives excellent agreement with far more sophisticated 1D hydro simulations despite using four orders of magnitude less computing time. It promises to be a powerful new tool for solar and stellar studies.

J. A. Klimchuk; S. Patsourakos; P. J. Cargill

2007-10-01T23:59:59.000Z

124

Novel Reactor Design for Solid Fuel Chemical Looping Combustion  

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

Novel Reactor Design for Solid Fuel Novel Reactor Design for Solid Fuel Chemical Looping Combustion Opportunity Research is active on the patent pending technology, titled "Apparatus and Method for Solid Fuel Chemical Looping Combustion." This technology is available for licensing and/or further collaborative research from the U.S. Department of Energy's National Energy Technology Laboratory. Overview The removal of CO2 from power plants is challenging because existing methods to separate CO2 from the gas mixture requires a significant fraction of the power plant output. Chemical-looping combustion (CLC) is a novel technology that utilizes a metal oxide oxygen carrier to transport oxygen to the fuel thereby avoiding direct contact between fuel and air. The use of CLC has the advantages of reducing the energy penalty while

125

A loop group extension of the odd Chern character.  

E-Print Network (OSTI)

We show that the universal odd Chern form, defined on the stable unitary group $U$, extends to the loop group $LU$ in a way that is closed with respect to an equivariant-type differential. This provides an odd analogue to the Bismut-Chern form. We also describe the associated transgression form, the so-called Bismut-Chern-Simons form, and explicate some properties it inherits as a differential form on the space of maps of a cylinder into the stable unitary group. As a corollary, we obtain the Chern character homomorphism from odd K-theory to the periodic cohomology of the free loop space, represented geometrically on the level of differential forms.

Scott O. Wilson

126

Chemical Looping for Combustion and Hydrogen Production  

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

ChemiCal looping for Combustion and ChemiCal looping for Combustion and hydrogen produCtion Objective The objective of this project is to determine the benefits of chemical looping technology used with coal to reduce CO 2 emissions. Background Chemical looping is a new method to convert coal or gasified coal to energy. In chemical looping, there is no direct contact between air and fuel. The chemical looping process utilizes oxygen from metal oxide oxygen carrier for fuel combustion, or for making hydrogen by "reducing" water. In combustion applications, the products of chemical looping are CO 2 and H 2 O. Thus, once the steam is condensed, a relatively pure stream of CO 2 is produced ready for sequestration. The production of a sequestration ready CO 2 stream does not require any additional separation units

127

Open-loop heat-recovery dryer  

DOE Patents (OSTI)

A drying apparatus is disclosed that includes a drum and an open-loop airflow pathway originating at an ambient air inlet, passing through the drum, and terminating at an exhaust outlet. A passive heat exchanger is included for passively transferring heat from air flowing from the drum toward the exhaust outlet to air flowing from the ambient air inlet toward the drum. A heat pump is also included for actively transferring heat from air flowing from the passive heat exchanger toward the exhaust outlet to air flowing from the passive heat exchanger toward the drum. A heating element is also included for further heating air flowing from the heat pump toward the drum.

TeGrotenhuis, Ward Evan

2013-11-05T23:59:59.000Z

128

Video looping of human cyclic motion  

E-Print Network (OSTI)

In this thesis, a system called Video Looping is developed to analyze human cyclic motions. Video Looping allows users to extract human cyclic motion from a given video sequence. This system analyzes similarities from a large amount of live footage to find the point of smooth transition. The final cyclic loop is created using only a few output images. Video Looping is useful not only to learn and understand human movements, but also to apply the cyclic loop to various artistic applications. To provide practical animation references, the output images are presented as photo plate sequences to visualize human cyclic motion similar to Eadweard Muybridge's image sequences. The final output images can be used to create experimental projects such as composited multiple video loops or small size of web animations. Furthermore, they can be imported into animation packages, and animators can create keyframe animations by tracing them in 3D software.

Choi, Hye Mee

2006-05-01T23:59:59.000Z

129

LMFBR with booster pump in pumping loop  

DOE Patents (OSTI)

A loop coolant circulation system is described for a liquid metal fast breeder reactor (LMFBR) utilizing a low head, high specific speed booster pump in the hot leg of the coolant loop with the main pump located in the cold leg of the loop, thereby providing the advantages of operating the main pump in the hot leg with the reliability of cold leg pump operation.

Rubinstein, H.J.

1975-10-14T23:59:59.000Z

130

Magnetic monopole in the loop representation  

Science Conference Proceedings (OSTI)

We quantize, within the Loop Representation formalism, the electromagnetic field in the presence of a static magnetic pole. It is found that the loop-dependent physical wave functionals of the quantum Maxwell theory become multivalued, through a topological phase factor depending on the solid angle subtended at the monopole by a surface bounded by the loop. It is discussed how this fact generalizes what occurs in ordinary quantum mechanics in multiply connected spaces.

Leal, Lorenzo; Lopez, Alexander [Grupo de Campos y Particulas, Departamento de Fisica, Facultad de Ciencias, Universidad Central de Venezuela, AP 47270, Caracas 1041-A (Venezuela); Centro de Fisica, Instituto Venezolano de Investigaciones Cientificas, AP 21827, Caracas 1020-A, Venezuela, and Grupo de Campos y Particulas, Departamento de Fisica, Facultad de Ciencias, Universidad Central de Venezuela (Venezuela)

2006-01-15T23:59:59.000Z

131

Coal Direct Chemical Looping (CDCL) Process Development  

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

Coal Direct Chemical Looping (CDCL) Retrofit to Pulverized Coal Power Plants for In-Situ CO 2 Capture William G. Lowrie Department of Chemical & Biomolecular Engineering The Ohio...

132

Aircraft Thermal Management Using Loop Heat Pipes.  

E-Print Network (OSTI)

??The objective of this thesis was to determine the feasibility of using loop heat pipes to dissipate waste heat from power electronics to the skin… (more)

Fleming, Andrew J.

2009-01-01T23:59:59.000Z

133

The closed fuel cycle  

Science Conference Proceedings (OSTI)

Available in abstract form only. Full text of publication follows: The fast growth of the world's economy coupled with the need for optimizing use of natural resources, for energy security and for climate change mitigation make energy supply one of the 21. century most daring challenges. The high reliability and efficiency of nuclear energy, its competitiveness in an energy market undergoing a new oil shock are as many factors in favor of the 'renaissance' of this greenhouse gas free energy. Over 160,000 tHM of LWR1 and AGR2 Used Nuclear Fuel (UNF) have already been unloaded from the reactor cores corresponding to 7,000 tons discharged per year worldwide. By 2030, this amount could exceed 400,000 tHM and annual unloading 14,000 tHM/year. AREVA believes that closing the nuclear fuel cycle through the treatment and recycling of Used Nuclear Fuel sustains the worldwide nuclear power expansion. It is an economically sound and environmentally responsible choice, based on the preservation of natural resources through the recycling of used fuel. It furthermore provides a safe and secure management of wastes while significantly minimizing the burden left to future generations. (authors)

Froment, Antoine; Gillet, Philippe [AREVA NC (France)

2007-07-01T23:59:59.000Z

134

UWB communication receiver feedback loop  

DOE Patents (OSTI)

A novel technique and structure that maximizes the extraction of information from reference pulses for UWB-TR receivers is introduced. The scheme efficiently processes an incoming signal to suppress different types of UWB as well as non-UWB interference prior to signal detection. Such a method and system adds a feedback loop mechanism to enhance the signal-to-noise ratio of reference pulses in a conventional TR receiver. Moreover, sampling the second order statistical function such as, for example, the autocorrelation function (ACF) of the received signal and matching it to the ACF samples of the original pulses for each transmitted bit provides a more robust UWB communications method and system in the presence of channel distortions.

Spiridon, Alex (Palo Alto, CA); Benzel, Dave (Livermore, CA); Dowla, Farid U. (Castro Valley, CA); Nekoogar, Faranak (San Ramon, CA); Rosenbury, Erwin T. (Castro Valley, CA)

2007-12-04T23:59:59.000Z

135

PHIGS function: emergency close phigs  

Science Conference Proceedings (OSTI)

emergency close phigs. All PVT documentation can be found under PHIGS Validation Tests - Overview. Also, you may return ...

136

Bounds on tracking error using closed-loop rapidly-exploring random trees  

E-Print Network (OSTI)

This paper considers the real-time motion planning problem for autonomous systems subject to complex dynamics, constraints, and uncertainty. Rapidly-exploring random trees (RRT) can be used to efficiently construct trees ...

Luders, Brandon Douglas

137

Closed-loop insulin delivery for treatment of type 1 diabetes  

E-Print Network (OSTI)

information about interstitial glucose levels to a handheld device about the size of a cellphone (red box) which holds a control algorithm and interacts with the user. An insulin pump (blue box in the pocket) delivers a rapid-acting insulin analog...

Elleri, Daniela; Dunger, David B; Hovorka, Roman

2011-11-09T23:59:59.000Z

138

Apparatus for closed-loop combustion control in internal combustion engines  

SciTech Connect

Schematically disclosed is an engine control apparatus wherein cylinder pressure is sensed before and after the top dead center position. Desired cylinder pressure curves are stored in a microcomputer for a range of engine speed-load combinations. By electrically comparing the actual pressure-time curve with the desired pressure curve for the existing speed-load combination it should be possible to generate an error signal representing deviation of actual engine performance from the desired performance, i.e., a permissible plus or minus band following the desired curve. The invention would provide a control action using only three parameters, namely engine speed, engine load and cylinder pressure.

Cheklich, G.E.

1983-03-10T23:59:59.000Z

139

Generic closed control loop of a high efficiency low volume bioethanol distillery.  

E-Print Network (OSTI)

??Bioethanol is a type of biofuel that is created by fermenting organic materials into a solution called mash. This mash contains water, dead yeast cells,… (more)

Pearson, Andrew

2012-01-01T23:59:59.000Z

140

Directly induced swing for closed loop control of electroslag remelting furnace  

DOE Patents (OSTI)

An apparatus and method are disclosed for controlling an electroslag remelting furnace, imposing a periodic fluctuation on electrode drive speed and thereby generating a predictable voltage swing signal. The fluctuation is preferably done by imposition of a sine, square, or sawtooth wave on the drive dc offset signal. 8 figs.

Damkroger, B.

1998-04-07T23:59:59.000Z

Note: This page contains sample records for the topic "active closed loop" 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

Privacy-preserving screen capture: Towards closing the loop for health IT usability  

Science Conference Proceedings (OSTI)

As information technology permeates healthcare (particularly provider-facing systems), maximizing system effectiveness requires the ability to document and analyze tricky or troublesome usage scenarios. However, real-world health IT systems are typically ... Keywords: Health IT, Privacy, Redaction, Security, Usability

Joseph Cooley, Sean Smith

2013-08-01T23:59:59.000Z

142

Closed-Loop Control and FEM-Based Thermal Management on ...  

Science Conference Proceedings (OSTI)

... years as a novel and efficient substitute for oven curing of powder coating, characterized by its high curing speed, negligible heating effects on the substrate

143

Study of gas contaminants and interaction with materials in RPC closed loop system  

E-Print Network (OSTI)

Resistive Plate Counters (RPC) detectors at the Large Hadron Collider (LHC) experiments use gas recirculation systems to cope with large gas mixture volumes and costs. In this paper a long-term systematic study about gas purifiers, gas contaminants and detector performance is discussed. The study aims at measuring the lifetime of purifiers with new and used cartridge material along with contaminants release in the gas system. During the data-taking the response of several RPC double-gap detectors was monitored in order to characterize the correlation between dark currents, filter status and gas contaminants.

S. Colafranceschi; R. Aurilio; L. Benussi; S. Bianco; L. Passamonti; D. Piccolo; D. Pierluigi; A. Russo; M. Ferrini; T. Greci; G. Saviano; C. Vendittozzi; M. Abbrescia; C. Calabria; A. Colaleo; G. Iaselli; M. Maggi; S. Nuzzo; G. Pugliese; P. Verwilligen; A. Sharma

2013-02-21T23:59:59.000Z

144

In situ heat treatment process utilizing a closed loop heating system  

Science Conference Proceedings (OSTI)

Systems and methods for an in situ heat treatment process that utilizes a circulation system to heat one or more treatment areas are described herein. The circulation system may use a heated liquid heat transfer fluid that passes through piping in the formation to transfer heat to the formation. In some embodiments, the piping may be positioned in at least two of the wellbores.

Vinegar, Harold J. (Bellaire, TX); Nguyen, Scott Vinh (Houston, TX)

2010-12-07T23:59:59.000Z

145

Closed-loop torque feedback for a universal field-oriented controller  

DOE Patents (OSTI)

A torque feedback system is employed in a universal field-oriented (UFO) controller to tune a torque-producing current command and a slip frequency command in order to achieve robust torque control of an induction machine even in the event of current regulator errors and during transitions between pulse width modulated (PWM) and square wave modes of operation.

De Doncker, Rik W. A. A. (Schenectady, NY); King, Robert D. (Schenectady, NY); Sanza, Peter C. (Clifton Park, NY); Haefner, Kenneth B. (Schenectady, NY)

1992-01-01T23:59:59.000Z

146

2102, Page 1 Experimental Investigation of Closed Loop Oscillating Heat Pipe as the  

E-Print Network (OSTI)

improvement in the coefficient of performance (COP) of a commercial heat pump using a mixture of refrigerants can be removed with the intent of performing composition analyses on them. The copper condenser commercial product, process, or serviceby trade name, trademark, manufacturer, or otherwise, does

Ghajar, Afshin J.

147

Closed-loop torque feedback for a universal field-oriented controller  

DOE Patents (OSTI)

A torque feedback system is employed in a universal field-oriented (UFO) controller to tune a torque-producing current command and a slip frequency command in order to achieve robust torque control of an induction machine even in the event of current regulator errors and during transitions between pulse width modulated (PWM) and square wave modes of operation. 1 figure.

De Doncker, R.W.A.A.; King, R.D.; Sanza, P.C.; Haefner, K.B.

1992-11-24T23:59:59.000Z

148

Closed-loop adaptive decision support based on automated trust assessment  

Science Conference Proceedings (OSTI)

This paper argues that it is important to study issues concerning trust and reliance when developing systems that are intended to augment cognition. Operators often under-rely on the help of a support system that provides advice or that performs certain ...

Peter-Paul van Maanen; Tomas Klos; Kees van Dongen

2007-07-01T23:59:59.000Z

149

Closed-loop controlled filament stretching and break-up of polymer solutions  

E-Print Network (OSTI)

A constant true (radial) strain rate filament stretching experiment has been the Holy Grail of extensional rheological studies. These experiments are performed on a Filament Stretching Extensional Rheometer (FiSER). A ...

Yeh, Roger, 1980-

2005-01-01T23:59:59.000Z

150

Understanding operational regimes of closed loop pulsating heat pipes: an experimental study  

E-Print Network (OSTI)

liquid­vapor distributions causing uneven void fraction in the tubes, and, · presence of approximately with the non-uniform void fraction distribution in respective tubes, as stated earlier, is the primary driving. Respective tube sections thus have a different volumetric phase distribution. One end of this tube bundle

Khandekar, Sameer

151

MANAGEMENT OF BLOWDOWN FROM CLOSED LOOP COOLING SYSTEMS USING IMPAIRED WATERS.  

E-Print Network (OSTI)

??Management of cooling tower blowdown is one of the key components in cooling tower operation and usually requires treatment to meet local, state or federal… (more)

Feng, Yinghua

2010-01-01T23:59:59.000Z

152

Study of gas contaminants and interaction with materials in RPC closed loop system  

E-Print Network (OSTI)

Resistive Plate Counters (RPC) detectors at the Large Hadron Collider (LHC) experiments use gas recirculation systems to cope with large gas mixture volumes and costs. In this paper a long-term systematic study about gas purifiers, gas contaminants and detector performance is discussed. The study aims at measuring the lifetime of purifiers with new and used cartridge material along with contaminants release in the gas system. During the data-taking the response of several RPC double-gap detectors was monitored in order to characterize the correlation between dark currents, filter status and gas contaminants.

Colafranceschi, S; Benussi, L; Bianco, S; Passamonti, L; Piccolo, D; Pierluigi, D; Russo, A; Ferrini, M; Greci, T; Saviano, G; Vendittozzi, C; Abbrescia, M; Calabria, C; Colaleo, A; Iaselli, G; Maggi, M; Nuzzo, S; Pugliese, G; Verwilligen, P; Sharma, A

2013-01-01T23:59:59.000Z

153

Installation of a close loop water system for cooling the turbine bearing oil  

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

KAPLAN TURBINE BLADE KAPLAN TURBINE BLADE CRACK WELD REPAIR BUILDING STRONG US Army Corps of Engineers Presented by Beau Biffle P. E. Chief, Hydropower Tulsa District Keystone Power Plant Sam Rayburn Power Plant BUILDING STRONG ® Keystone Power Plant Unit # 2 Technical Data Rated at 35 MW Average yearly generation - 127,000 MWH Unit placed online May 1968 Sam Rayburn Power Plant Unit #2 Technical Data Rated at 26 MW Average yearly generation - 30,000 MWH Unit placed online 1965 BUILDING STRONG ® General Information  The repair procedure developed by HDC for the McNary Power Plant was used for both of these repairs  Both repairs were performed by Corps employees  Both cracks were discovered during routine inspections BUILDING STRONG ® Keystone Repair

154

Scaling law for the heating of solar coronal loops  

E-Print Network (OSTI)

We report preliminary results from a series of numerical simulations of the reduced magnetohydrodynamic equations, used to describe the dynamics of magnetic loops in active regions of the solar corona. A stationary velocity field is applied at the photospheric boundaries to imitate the driving action of granule motions. A turbulent stationary regime is reached, characterized by a broadband power spectrum $E_k\\simeq k^{-3/2}$ and heating rate levels compatible with the heating requirements of active region loops. A dimensional analysis of the equations indicates that their solutions are determined by two dimensionless parameters: the Reynolds number and the ratio between the Alfven time and the photospheric turnover time. From a series of simulations for different values of this ratio, we determine how the heating rate scales with the physical parameters of the problem, which might be useful for an observational test of this model.

Pablo Dmitruk; Daniel Gomez

1999-10-18T23:59:59.000Z

155

Slack analysis in the system design loop  

Science Conference Proceedings (OSTI)

We present a system-level technique to analyze the impact of design optimizations on system-level timing dependencies. This technique enables us to speed up the design cycle by substituting, in the design the loop, the time-consuming simulation step ... Keywords: slack analysis, system design loop, timing update

Girish Venkataramani; Seth C. Goldstein

2008-10-01T23:59:59.000Z

156

Hard thermal loops in static background fields  

E-Print Network (OSTI)

We discuss the high temperature behavior of retarded thermal loops in static external fields. We employ an analytic continuation of the imaginary time formalism and use a spectral representation of the thermal amplitudes. We show that, to all orders, the leading contributions of static hard thermal loops can be directly obtained by evaluating them at zero external energies and momenta.

Brandt, F T; Siqueira, J B

2013-01-01T23:59:59.000Z

157

Newtonian gravity in loop quantum gravity  

E-Print Network (OSTI)

We apply a recent argument of Verlinde to loop quantum gravity, to conclude that Newton's law of gravity emerges in an appropriate limit and setting. This is possible because the relationship between area and entropy is realized in loop quantum gravity when boundaries are imposed on a quantum spacetime.

Smolin, Lee

2010-01-01T23:59:59.000Z

158

Coronal loop detection from solar images  

Science Conference Proceedings (OSTI)

In this paper, we make an overview of a methodology for the automatic retrieval of images with coronal loops from the solar image data captured by the extreme-ultraviolet imaging telescope (EIT) onboard the spacecraft SOHO (Solar and Heliospheric Observatory). ... Keywords: Classification techniques, Coronal loop, Curvature feature, Data mining, Feature extraction, Image retrieval, Solar images

Nurcan Durak; Olfa Nasraoui; Joan Schmelz

2009-11-01T23:59:59.000Z

159

Efficient Hardware Looping Units for FPGAs  

Science Conference Proceedings (OSTI)

Looping operations impose a significant bottleneck to achieving better computational efficiency for embedded applications. To confront this problem in embedded computation either in the form of programmable processors or FSMD (Finite-State Machine with ... Keywords: FPGA, embedded system, high-level synthesis, hardware looping, control unit

Nikolaos Kavvadias; Konstantinos Masselos

2010-07-01T23:59:59.000Z

160

Is the Loop Current a Chaotic Oscillator?  

Science Conference Proceedings (OSTI)

Dynamical systems theory is employed to study the irregular Loop Current in the Gulf of Mexico using a short database of shedding periods and north–south positions of the current. Two independent tests based on these data suggest that the Loop ...

Alexis Lugo-Fernández

2007-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "active closed loop" 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

Coal Direct Chemical Looping (CDCL) Process Development  

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

Direct Chemical Looping (CDCL) Retrofit to Direct Chemical Looping (CDCL) Retrofit to Pulverized Coal Power Plants for In-Situ CO 2 Capture William G. Lowrie Department of Chemical & Biomolecular Engineering The Ohio State University Columbus, OH 43210 Award #: DE-NT0005289 PI: Liang-Shih Fan Presenter: Samuel Bayham Department of Chemical and Biomolecular Engineering The Ohio State University 2013 NETL CO2 Capture Technology Meeting July 11, 2013 Pittsburgh, PA Clean Coal Research Laboratory at The Ohio State University Sub-Pilot Scale Unit 250kW th Pilot Unit (Wilsonville, Alabama) Syngas Chemical Looping Coal-Direct Chemical Looping Cold Flow Model Sub-Pilot Scale Unit HPHT Slurry Bubble Column 120kW th Demonstration Unit Calcium Looping Process CCR Process Sub-Pilot Unit F-T Process

162

Dual quark condensate and dressed Polyakov loops  

E-Print Network (OSTI)

We construct a new order parameter for finite temperature QCD by considering the quark condensate for U(1)-valued temporal boundary conditions for the fermions. Fourier transformation with respect to the boundary condition defines the dual condensate. This quantity corresponds to an equivalence class of Polyakov loops, thereby being an order parameter for the center symmetry. We explore the duality relation between the quark condensate and these dressed Polyakov loops numerically, using quenched lattice QCD configurations below and above the QCD phase transition. It is demonstrated that the Dirac spectrum responds differently to changing the boundary condition, in a manner that reproduces the expected Polyakov loop pattern. We find the dressed Polyakov loops to be dominated by the lowest Dirac modes, in contrast to thin Polyakov loops investigated earlier.

Erek Bilgici; Falk Bruckmann; Christof Gattringer; Christian Hagen

2008-01-28T23:59:59.000Z

163

A THEORETICAL STUDY OF THE TRANSIENT OPERATION AND STABILITY OF TWO-PHASE NATURAL CIRCULATION LOOPS  

SciTech Connect

Mathematical models of the time-dependent behavior of two-phase natural- circulation loops were used to predict the operation and to explain the unusual instability sometimes observed. The initial results obtained for a loop similar to the Univ. of Minnesota loop were used to formulate a more complex and accurate model, and the predicted transient behavior was in close agreement with the experimental results from the Minnesota loop. For a 300psia, high-pressure loop, unstable oscillatory behavior was predicted under certain conditions and stable behavior under others. Closed unstable regions rather than limits were predicted, and the specifications of stability in terms of a single parameter were found to be impossible. The great difference in oscillatory frequencies observed at low and high pressures was found to be due largely to the system geometry. The criterion for the absence of oscillations was found to be similar to one of the criteria for stability of chemical reaction systems. (D.L.C.)

Garlid, K.; Amundson, N.R.; Isbin, H.S.

1961-06-01T23:59:59.000Z

164

MODEL FOR ALFVEN WAVE TURBULENCE IN SOLAR CORONAL LOOPS: HEATING RATE PROFILES AND TEMPERATURE FLUCTUATIONS  

Science Conference Proceedings (OSTI)

It has been suggested that the solar corona may be heated by dissipation of Alfven waves that propagate up from the solar photosphere. According to this theory, counterpropagating Alfven waves are subject to nonlinear interactions that lead to turbulent decay of the waves and heating of the chromospheric and coronal plasma. To test this theory, better models for the dynamics of Alfven waves in coronal loops are required. In this paper, we consider wave heating in an active region observed with the Solar Dynamics Observatory in 2010 May. First a three-dimensional (3D) magnetic model of the region is constructed, and ten magnetic field lines that match observed coronal loops are selected. For each loop we construct a 3D magnetohydrodynamic model of the Alfven waves near the selected field line. The waves are assumed to be generated by footpoint motions inside the kilogauss magnetic flux elements at the two ends of the loop. Based on such models, we predict the spatial and temporal profiles of the heating along the selected loops. We also estimate the temperature fluctuations resulting from such heating. We find that the Alfven wave turbulence model can reproduce the observed characteristics of the hotter loops in the active region core, but the loops at the periphery of the region have large expansion factors and are predicted to be thermally unstable.

Asgari-Targhi, M.; Van Ballegooijen, A. A. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street MS-15, Cambridge, MA 02138 (United States)

2012-02-10T23:59:59.000Z

165

The structural coupling between ATPase activation and recovery stroke in the myosin II motor  

DOE Green Energy (OSTI)

Before the myosin motor head can perform the next power stroke, it undergoes a large conformational transition in which the converter domain, bearing the lever arm, rotates {approx} 65{sup o}. Simultaneous with this 'recovery stroke', myosin activates its ATPase function by closing the Switch-2 loop over the bound ATP. This coupling between the motions of the converter domain and of the 40 {angstrom}-distant Switch-2 loop is essential to avoid unproductive ATP hydrolysis. The coupling mechanism is determined here by finding a series of optimized intermediates between crystallographic end structures of the recovery stroke (Dictyostelium discoideum), yielding movies of the transition at atomic detail. The successive formation of two hydrogen bonds by the Switch-2 loop is correlated with the successive see-saw motions of the relay and SH1 helices that hold the converter domain. SH1 helix and Switch-2 loop communicate via a highly conserved loop that wedges against the SH1-helix upon Switch-2 closing.

Koppole, Sampath [University of Heidelberg; Smith, Jeremy C [ORNL; Fischer, S. [University of Heidelberg

2007-07-01T23:59:59.000Z

166

Closed-cycle Retrofit Study  

Science Conference Proceedings (OSTI)

EPRI is investigating implications of a potential U.S. Environmental Protection Agency (EPA) Clean Water Act 316(b) rulemaking that would establish "Best Technology Available" (BTA) based on closed-cycle cooling retrofits for facilities with once-through cooling. This report focuses on estimated costs associated with closed-cycle cooling system retrofits that include: 1) capital costs, 2) energy required to operate the closed-cycle system, 3) heat rate penalty, and 4) extended downtime required to retrof...

2011-01-31T23:59:59.000Z

167

Closing the light gluino window  

E-Print Network (OSTI)

The running of the strong coupling constant, $R_{e^+e^-},R_Z$ and $R_\\tau$ is studied on the three-loop level. Based on experimental data of $R_{e^+e^-},R_Z$ and $R_\\tau$ and the LEP multijet analysis, the light gluino scenario is excluded to 99.97% CL (window I) and 99.89% CL (window III).

Ferenc Csikor; Zoltan Fodor

1997-12-04T23:59:59.000Z

168

NONLINEAR FORCE-FREE MAGNETIC FIELD FITTING TO CORONAL LOOPS WITH AND WITHOUT STEREOSCOPY  

SciTech Connect

We developed a new nonlinear force-free magnetic field (NLFFF) forward-fitting algorithm based on an analytical approximation of force-free and divergence-free NLFFF solutions, which requires as input a line-of-sight magnetogram and traced two-dimensional (2D) loop coordinates of coronal loops only, in contrast to stereoscopically triangulated three-dimensional loop coordinates used in previous studies. Test results of simulated magnetic configurations and from four active regions observed with STEREO demonstrate that NLFFF solutions can be fitted with equal accuracy with or without stereoscopy, which relinquishes the necessity of STEREO data for magnetic modeling of active regions (on the solar disk). The 2D loop tracing method achieves a 2D misalignment of {mu}{sub 2} = 2. Degree-Sign 7 {+-} 1. Degree-Sign 3 between the model field lines and observed loops, and an accuracy of Almost-Equal-To 1.0% for the magnetic energy or free magnetic energy ratio. The three times higher spatial resolution of TRACE or SDO/AIA (compared with STEREO) also yields a proportionally smaller misalignment angle between model fit and observations. Visual/manual loop tracings are found to produce more accurate magnetic model fits than automated tracing algorithms. The computation time of the new forward-fitting code amounts to a few minutes per active region.

Aschwanden, Markus J., E-mail: aschwanden@lmsal.com [Lockheed Martin Advanced Technology Center, Solar and Astrophysics Laboratory, Org. ADBS, Bldg. 252, 3251 Hanover St., Palo Alto, CA 94304 (United States)

2013-02-15T23:59:59.000Z

169

Supervisory control of a pilot-scale cooling loop  

SciTech Connect

We combine a previously developed strategy for Fault Detection and Identification (FDI) with a supervisory controller in closed loop. The combined method is applied to a model of a pilot-scale cooling loop of a nuclear plant, which includes Kalman filters and a model-based predictive controller as part of normal operation. The system has two valves available for flow control meaning that some redundancy is available. The FDI method is based on likelihood ratios for different fault scenarios which in turn are derived from the application of the Kalman filter. A previously introduced extension of the FDI method is used here to enable detection and identification of non-linear faults like stuck valve problems and proper accounting of the time of fault introduction. The supervisory control system is designed so to take different kinds of actions depending on the status of the fault diagnosis task and on the type of identified fault once diagnosis is complete. Some faults, like sensor bias and drift, are parametric in nature and can be adjusted without need for reconfiguration of the regulatory control system. Other faults, like a stuck valve problem, require reconfiguration of the regulatory control system. The whole strategy is demonstrated for several scenarios.

Kris Villez; Venkat Venkatasubramanian; Humberto Garcia

2011-08-01T23:59:59.000Z

170

LOOP CALCULUS AND BELIEF PROPAGATION FOR Q-ARY ALPHABET: LOOP TOWER  

Science Conference Proceedings (OSTI)

Loop calculus introduced in [1], [2] constitutes a new theoretical tool that explicitly expresses symbol Maximum-A-Posteriori (MAP) solution of a general statistical inference problem via a solution of the Belief Propagation (BP) equations. This finding brought a new significance to the BP concept, which in the past was thought of as just a loop-free approximation. In this paper they continue a discussion of the Loop Calculus, partitioning the results into three Sections. In Section 1 they introduce a new formulation of the Loop Calculus in terms of a set of transformations (gauges) that keeping the partition function of the problem invariant. The full expression contains two terms referred to as the 'ground state' and 'excited states' contributions. The BP equations are interpreted as a special (BP) gauge fixing condition that emerges as a special orthogonality constraint between the ground state and excited states, which also selects loop contributions as the only surviving ones among the excited states. In Section 2 they demonstrate how the invariant interpretation of the Loop Calculus, introduced in Section 1, allows a natural extension to the case of a general q-ary alphabet, this is achieved via a loop tower sequential construction. The ground level in the tower is exactly equivalent to assigning one color (out of q available) to the 'ground state' and considering all 'excited' states colored in the remaining (q-1) colors, according to the loop calculus rule. Sequentially, the second level in the tower corresponds to selecting a loop from the previous step, colored in (q-1) colors, and repeating the same ground vs excited states splitting procedure into one and (q-2) colors respectively. The construction proceeds till the full (q-1)-levels deep loop tower (and the corresponding contributions to the partition function) are established. In Section 3 they discuss an ultimate relation between the loop calculus and the Bethe-Free energy variational approach of [3].

CHERTKOV, MICHAEL [Los Alamos National Laboratory; CHERNYAK, VLADIMIR [Los Alamos National Laboratory

2007-01-10T23:59:59.000Z

171

Parameterizing loop fusion for automated empirical tuning  

SciTech Connect

Traditional compilers are limited in their ability to optimize applications for different architectures because statically modeling the effect of specific optimizations on different hardware implementations is difficult. Recent research has been addressing this issue through the use of empirical tuning, which uses trial executions to determine the optimization parameters that are most effective on a particular hardware platform. In this paper, we investigate empirical tuning of loop fusion, an important transformation for optimizing a significant class of real-world applications. In spite of its usefulness, fusion has attracted little attention from previous empirical tuning research, partially because it is much harder to configure than transformations like loop blocking and unrolling. This paper presents novel compiler techniques that extend conventional fusion algorithms to parameterize their output when optimizing a computation, thus allowing the compiler to formulate the entire configuration space for loop fusion using a sequence of integer parameters. The compiler can then employ an external empirical search engine to find the optimal operating point within the space of legal fusion configurations and generate the final optimized code using a simple code transformation system. We have implemented our approach within our compiler infrastructure and conducted preliminary experiments using a simple empirical search strategy. Our results convey new insights on the interaction of loop fusion with limited hardware resources, such as available registers, while confirming conventional wisdom about the effectiveness of loop fusion in improving application performance.

Zhao, Y; Yi, Q; Kennedy, K; Quinlan, D; Vuduc, R

2005-12-15T23:59:59.000Z

172

Active Terahertz Metamaterial Devices  

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

Active Terahertz Metamaterial Devices Active Terahertz Metamaterial Devices Active Terahertz Metamaterial Devices Metamaterial structures are taught which provide for the modulation of terahertz frequency signals. Available for thumbnail of Feynman Center (505) 665-9090 Email Active Terahertz Metamaterial Devices Metamaterial structures are taught which provide for the modulation of terahertz frequency signals. Each element within an array of metamaterial (MM) elements comprises multiple loops and at least one gap. The MM elements may comprise resonators with conductive loops and insulated gaps, or the inverse in which insulated loops are present with conductive gaps; each providing useful transmissive control properties. The metamaterial elements are fabricated on a semiconducting substrate configured with a

173

Vehicle Technologies Office: Closed Solicitations  

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

Closed Solicitations Closed Solicitations Technology Solicitation Title Open Date Close Date Hydrogen and Fuel Cells- Hydrogen and Fuel Cells Request for Information (RFI) on performance, durability, and cost targets for fuel cells designed for Combined Heat and Power (CHP) and Auxiliary Power Unit (APU) applications Office of Energy Efficiency and Renewable Energy 05/28/2009 06/30/2009 Vehicle Technologies- Vehicle Technologies Recovery Act - Systems Level Technology Development, Integration,and Demonstration for Efficient Class 8 Trucks (SuperTruck) and Advanced Technology Powertrains For Light-Duty Vehicles (ATP-LD) Office of Energy Efficiency and Renewable Energy 06/09/2009 09/09/2009 Crosscutting U.S. China Clean Energy Research Center (CERC) Office of Energy Efficiency and Renewable Energy 03/30/2010 05/21/2010

174

Simulating dislocation loop internal dynamics and collective diffusion using stochastic differential equations  

Science Conference Proceedings (OSTI)

Nanoscale prismatic loops are modeled via a partial stochastic differential equation that describes an overdamped continuum elastic string, with a view to describing both the internal and collective dynamics of the loop as a function of temperature. Within the framework of the Langevin equation, expressions are derived that relate the empirical parameters of the model, the friction per unit length, and the elastic stiffness per unit length, to observables that can be obtained directly via molecular-dynamics simulations of interstitial or vacancy prismatic loop mobility. The resulting expressions naturally exhibit the properties that the collective diffusion coefficient of the loop (i) scales inversely with the square root of the number of interstitials, a feature that has been observed in both atomistic simulation and in situ TEM investigations of loop mobility, and (ii) the collective diffusion coefficient is not at all dependent on the internal interactions within the loop, thus qualitatively rationalizing past simulation results showing that the characteristic migration energy barrier is comparable to that of a single interstitial, and cluster migration is a result of individual (but correlated) interstitial activity.

Derlet, P. M.; Gilbert, M. R.; Dudarev, S. L. [Condensed Matter Theory Group, Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland); EURATOM/CCFE Fusion Association, Culham Centre for Fusion Energy, Oxfordshire OX14 3DB (United Kingdom)

2011-10-01T23:59:59.000Z

175

Closed sets of nonlocal correlations  

Science Conference Proceedings (OSTI)

We present a fundamental concept - closed sets of correlations - for studying nonlocal correlations. We argue that sets of correlations corresponding to information-theoretic principles, or more generally to consistent physical theories, must be closed under a natural set of operations. Hence, studying the closure of sets of correlations gives insight into which information-theoretic principles are genuinely different, and which are ultimately equivalent. This concept also has implications for understanding why quantum nonlocality is limited, and for finding constraints on physical theories beyond quantum mechanics.

Allcock, Jonathan; Linden, Noah [Department of Mathematics, University of Bristol, Bristol BS8 1TW (United Kingdom); Brunner, Nicolas; Popescu, Sandu; Skrzypczyk, Paul [H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL (United Kingdom); Vertesi, Tamas [Institute of Nuclear Research, Hungarian Academy of Sciences, P.O. Box 51, H-4001 Debrecen (Hungary)

2009-12-15T23:59:59.000Z

176

Selective purge for hydrogenation reactor recycle loop  

SciTech Connect

Processes and apparatus for providing improved contaminant removal and hydrogen recovery in hydrogenation reactors, particularly in refineries and petrochemical plants. The improved contaminant removal is achieved by selective purging, by passing gases in the hydrogenation reactor recycle loop or purge stream across membranes selective in favor of the contaminant over hydrogen.

Baker, Richard W. (Palo Alto, CA); Lokhandwala, Kaaeid A. (Union City, CA)

2001-01-01T23:59:59.000Z

177

Free Steiner Loops Smile Markovski, Ana Sokolova  

E-Print Network (OSTI)

Free Steiner Loops Smile Markovski, Ana Sokolova Faculty of Sciences and Mathematics, Institute and finite sloops. Two constructions of free objects in the variety of sloops are pre­ sented in this paper. They both allow recursive construction of a free sloop with a free base X, provided that X is recursively

Sokolova, Ana

178

Loop expansion in Yang-Mills thermodynamics  

E-Print Network (OSTI)

We argue that a selfconsistent spatial coarse-graining, which involves interacting (anti)calorons of unit topological charge modulus, implies that real-time loop expansions of thermodynamical quantities in the deconfining phase of SU(2) and SU(3) Yang-Mills thermodynamics are, modulo 1PI resummations, determined by a finite number of connected bubble diagrams.

Ralf Hofmann

2006-09-05T23:59:59.000Z

179

Loop realizations of quantum affine algebras  

Science Conference Proceedings (OSTI)

We give a simplified description of quantum affine algebras in their loop presentation. This description is related to Drinfeld's new realization via halves of vertex operators. We also define an idempotent version of the quantum affine algebra which is suitable for categorification.

Cautis, Sabin [Department of Mathematics, University of Southern California, Los Angeles, California, 90089 (United States); Licata, Anthony [Department of Mathematics, Australian National University, Canberra (Australia)

2012-12-15T23:59:59.000Z

180

SAVE THIS | EMAIL THIS | Close  

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

SAVE THIS | EMAIL THIS | Close SAVE THIS | EMAIL THIS | Close Monitoring laser weld quality Due to the increasing use of high-power CO 2 lasers for welding automotive transmission components at Chrysler (now DaimlerChrysler Corporation), executive board members realized the significance of developing a real-time weld process monitor to ensure that its high quality automotive standards are maintained. This led to a mandate that a monitoring system would be developed and installed on all laser welding systems at Chrysler. Accepting the challenge to develop the technology, a team at Argonne National Laboratory headed by Dr. Keng Leong, was given mandatory specifications that the system had to be real time, user friendly, low cost, robust, and above all, reliable. Dr. Leong brought Spawr Industries Inc. (Lake Havasu City, AZ) into

Note: This page contains sample records for the topic "active closed loop" 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

Loop simulation capability for sodium-cooled systems  

E-Print Network (OSTI)

A one-dimensional loop simulation capability has been implemented in the thermal-hydraulic analysis code, THERMIT-4E. This code had been used to simulate and investigate flow in test sections of experimental sodium loops ...

Adekugbe, Oluwole A.

1984-01-01T23:59:59.000Z

182

Design and Fabrication of a Vertical Pump Multiphase Flow Loop  

E-Print Network (OSTI)

A new centrifugal pump has been devised to handle two-phase flow. However, it requires full scale testing to allow further development. Testing is required to verify performance and to gain information needed to apply this design in the field. Further, testing will allow mathematical models to be validated which will allow increased understanding of the pump's behavior. To perform this testing, a new facility was designed and constructed. This facility consists of a closed flow loop. The pump is supplied by separate air and water inlet flows that mix just before entering the pump. These flows can be controlled to give a desired gas volume fraction and overall flow rate. The pump outlet flows into a tank which separates the fluids allowing them to re-circulate. Operating inlet pressures of up to three hundred PSIG will be used with a flow rate of twelve hundred gallons per minute. A two-hundred fifty horsepower electric motor is used to power the pump. The loop is equipped with instrumentation to measure temperature, pressure, flow rate, pump speed, pump shaft horsepower, shaft torque, and shaft axial load. The pump itself has a clear inlet section and a clear section allowing visualization of the second stage volute interior as well as numerous pressure taps along the second stage volute. This instrumentation is sufficient to completely characterize the pump. Design and construction details are provided as well as a history of the initial operating experiences and data collected. A discussion of lessons learned is given in the conclusions. Future projects intended to use this facility are also given. Finally, detailed design drawings are supplied as well as operating instructions and checklists.

Kirkland, Klayton 1965-

2012-12-01T23:59:59.000Z

183

Better 'Photon Loops' May Be Key to Computer and Physics ...  

Science Conference Proceedings (OSTI)

Better 'Photon Loops' May Be Key to Computer and Physics Advances. From NIST Tech Beat: August 22, 2011. ...

2012-08-23T23:59:59.000Z

184

Hydrogen-bond driven loop-closure kinetics in unfolded polypeptide chains  

DOE Green Energy (OSTI)

Characterization of the length dependence of end-to-end loop-closure kinetics in unfolded polypeptide chains provides an understanding of early steps in protein folding. Here, loop-closure in poly-glycine-serine peptides is investigated by combining single-molecule fluorescence spectroscopy with molecular dynamics simulation. For chains containing more than 10 peptide bonds loop-closing rate constants on the 20-100 nanosecond time range exhibit a power-law length dependence. However, this scaling breaks down for shorter peptides, which exhibit slower kinetics arising from a perturbation induced by the dye reporter system used in the experimental setup. The loop-closure kinetics in the longer peptides is found to be determined by the formation of intra-peptide hydrogen bonds and transient beta-sheet structure, that accelerate the search for contacts among residues distant in sequence relative to the case of a polypeptide chain in which hydrogen bonds cannot form. Hydrogen-bond-driven polypeptide-chain collapse in unfolded peptides under physiological conditions found here is not only consistent with hierarchical models of protein folding, that highlights the importance of secondary structure formation early in the folding process, but is also shown to speed up the search for productive folding events.

Daidone, Isabella [University of Heidelberg; Neuweiler, H [University of Heidelberg; Doose, S [University of Heidelberg; Sauer, M [University of Heidelberg; Smith, Jeremy C [ORNL

2010-12-01T23:59:59.000Z

185

Liquid Lead-Bismuth Materials Test Loop Valentina Tcharnotskaia, Curtt Ammerman, Timothy Darling, Joe King,  

E-Print Network (OSTI)

is connected to the main loop piping via a globe valve. This valve can regulate the flow through the gas the gas injection and regulation system. We will calibrate the Magnetic Flow Meter. Next heating rates.84GPM. Liquid LBE flow can be activated by a mechanical sump pump or by natural convection. In order

McDonald, Kirk

186

MESSAGE: WIA W/O CLOSING REF CLOSING REF  

Office of Legacy Management (LM)

MESSAGE: MESSAGE: WIA W/O CLOSING REF CLOSING REF _ CONSTRUCTION COMPL DATE J. King SAIC J. Waddell SAIC R. Wright SAIC T. Gangwer SAIC M. Khan SAIC T. Patterson SAIC R. Tucker SAIC C.Helie SAIC K. Renfro SAIC S. Heptinstall SAIC PLEASE RETURN TO PDCC FOR CORRECTIONS MGMT. SYSTEMS: PROGRAM ADMIN.: DEPUTY PROGRAM MGR: PROJECT MANAGER: () I PROGRAM MANAGER: I I ANL: AJ. Dvorak ANL A Geisler ANL G. Maraman ANL D. Dunning ANL J. Wing BNI DIRECTOR. FSRD: L Price FSRD DEP. DIRECTOR. FSRD: W.Seay FSRD SITE MANAGER: D.Adler FSRD " S. Cange FSRD R. Kirk FSRD J. Kopotic FSRD M. Nee FSRD PROJECT SUPPORT GRP: J.Hart FSRD S. Oldham FSRD 4- G. Hartman FSRD L Marz FSRD PRGM ANALYST: B. Hughlett FSRD SECRETARY: M. Seiber"''' Dyke FSRD FSRD CHRON FILE FSRD NOTEBOOKS READING FILE DOEIP&CD: French/Sistrunk DCO DOEIHO: J. Wagoner DHO RESeDNSE TRACKING INFORMATION SECONDARY: / : SECONDARY: ~ OWED TO: / lOWED

187

A Load Balancing Tool for Distributed Parallel Loops  

Science Conference Proceedings (OSTI)

Large scale applications typically contain parallel loops with many iterates. The iterates of a parallel loop may have variable execution times which translate into performance degradation of an application due to load imbalance. This paper describes ... Keywords: adaptive loop scheduling, dynamic load balancing

Ricolindo L. Carińo; Ioana Banicescu

2005-10-01T23:59:59.000Z

188

EXAMINATION OF HIGH PRESSURE RECOMBINER LOOP SPECIMENS  

DOE Green Energy (OSTI)

Speciments of iodide zirconium, Zircaloy-2, Zr-15Nb, iodide titanium, TMCA-45 titanium, A-110AT titanium, and 430 stainless steel were corroded in a highpressure recombiner loop. Analyses were performed to determine the amount of hydrogen pickup. The titanium materials and iodide zirconium showed very high hydrogen pickups, while the zirconium alloys and the 430 stainless steel absorbed smaller amounts of hydrogen Metallographic examination of the specimens showed that recrystallization occurred in all but the Ar-15Nb specimens. There seems to be little difference in the extent of recrystallization and grain growth whether the in the recombiner section at 430 to 500 deg C. Recrystalliplained or correlated in any way with the amount of f hydrogen sion that occured. Since hydrogen is known to seriously embrittle zirconium and titanium, it is recommended that crystal-bar zirconium and titanium alloys not be used as materials of construction in environ ments sinmilar to that of the High Pressure Recombiner Loop. (auth)

Picklesimer, M.L.; Rittenhouse, P.L.

1958-08-14T23:59:59.000Z

189

Projective Structures in Loop Quantum Cosmology  

E-Print Network (OSTI)

Projective structures have successfully been used for the construction of measures in the framework of loop quantum gravity. In the present paper we establish such a structure for the space $R \\sqcup R_Bohr$ recently constructed in the context of homogeneous isotropic loop quantum cosmology. This space has the advantage to be canonically embedded into the quantum configuration space of the full theory, but, in contrast to the traditional space $R_Bohr$, there exists no Haar measure on $R \\sqcup R_Bohr$. The introduced projective structure, however, allows to construct a family of canonical measures on $R \\sqcup R_Bohr$ whose corresponding Hilbert spaces of square integrable functions we finally investigate.

Maximilian Hanusch

2013-09-03T23:59:59.000Z

190

Lorentz covariance of loop quantum gravity  

SciTech Connect

The kinematics of loop gravity can be given a manifestly Lorentz-covariant formulation: the conventional SU(2)-spin-network Hilbert space can be mapped to a space K of SL(2,C) functions, where Lorentz covariance is manifest. K can be described in terms of a certain subset of the projected spin networks studied by Livine, Alexandrov and Dupuis. It is formed by SL(2,C) functions completely determined by their restriction on SU(2). These are square-integrable in the SU(2) scalar product, but not in the SL(2,C) one. Thus, SU(2)-spin-network states can be represented by Lorentz-covariant SL(2,C) functions, as two-component photons can be described in the Lorentz-covariant Gupta-Bleuler formalism. As shown by Wolfgang Wieland in a related paper, this manifestly Lorentz-covariant formulation can also be directly obtained from canonical quantization. We show that the spinfoam dynamics of loop quantum gravity is locally SL(2,C)-invariant in the bulk, and yields states that are precisely in K on the boundary. This clarifies how the SL(2,C) spinfoam formalism yields an SU(2) theory on the boundary. These structures define a tidy Lorentz-covariant formalism for loop gravity.

Rovelli, Carlo; Speziale, Simone [Centre de Physique Theorique de Luminy, Case 907, F-13288 Marseille (France)

2011-05-15T23:59:59.000Z

191

MAGNETIC LOOPS IN THE QUIET SUN  

Science Conference Proceedings (OSTI)

We investigate the fine structure of magnetic fields in the atmosphere of the quiet Sun. We use photospheric magnetic field measurements from SUNRISE/IMaX with unprecedented spatial resolution to extrapolate the photospheric magnetic field into higher layers of the solar atmosphere with the help of potential and force-free extrapolation techniques. We find that most magnetic loops that reach into the chromosphere or higher have one footpoint in relatively strong magnetic field regions in the photosphere. Ninety-one percent of the magnetic energy in the mid-chromosphere (at a height of 1 Mm) is in field lines, whose stronger footpoint has a strength of more than 300 G, i.e., above the equipartition field strength with convection. The loops reaching into the chromosphere and corona are also found to be asymmetric in the sense that the weaker footpoint has a strength B < 300 G and is located in the internetwork (IN). Such loops are expected to be strongly dynamic and have short lifetimes, as dictated by the properties of the IN fields.

Wiegelmann, T.; Solanki, S. K.; Barthol, P.; Gandorfer, A. [Max-Planck-Institut fuer Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau (Germany); Borrero, J. M.; Schmidt, W. [Kiepenheuer-Institut fuer Sonnenphysik, Schoeneckstr. 6, 79104 Freiburg (Germany); Pillet, V. MartInez; Bonet, J. A. [Instituto de Astrofisica de Canarias, C/Via Lactea s/n, 38200 La Laguna, Tenerife (Spain); Del Toro Iniesta, J. C. [Instituto de Astrofisica de Andalucia (CSIC), Apartado de Correos 3004, 18080 Granada (Spain); Domingo, V. [Grupo de Astronomia y Ciencias del Espacio, Universidad de Valencia, 46980 Paterna, Valencia (Spain); Knoelker, M. [High Altitude Observatory, National Center for Atmospheric Research Boulder, CO 80307 (United States); Title, A. M., E-mail: wiegelmann@mps.mpg.d [Lockheed Martin Solar and Astrophysics Laboratory, Bldg. 252, 3251 Hanover Street, Palo Alto, CA 94304 (United States)

2010-11-10T23:59:59.000Z

192

Flipped spinfoam vertex and loop gravity  

E-Print Network (OSTI)

We introduce a vertex amplitude for 4d loop quantum gravity. We derive it from a conventional quantization of a Regge discretization of euclidean general relativity. This yields a spinfoam sum that corrects some difficulties of the Barrett-Crane theory. The second class simplicity constraints are imposed weakly, and not strongly as in Barrett-Crane theory. Thanks to a flip in the quantum algebra, the boundary states turn out to match those of SO(3) loop quantum gravity -- the two can be identified as eigenstates of the same physical quantities -- providing a solution to the problem of connecting the covariant SO(4) spinfoam formalism with the canonical SO(3) spin-network one. The vertex amplitude is SO(3) and SO(4)-covariant. It rectifies the triviality of the intertwiner dependence of the Barrett-Crane vertex, which is responsible for its failure to yield the correct propagator tensorial structure. The construction provides also an independent derivation of the kinematics of loop quantum gravity and of the result that geometry is quantized.

Jonathan Engle; Roberto Pereira; Carlo Rovelli

2007-08-09T23:59:59.000Z

193

Ground Loops for Heat Pumps and Refrigeration  

E-Print Network (OSTI)

Ground loops are used for water source heat pumps. Refrigeration can be put on a ground loop. Water-cooled condensing units are more efficient than air-cooled, and they can be put indoors. Indoor location makes piping for desuperheater hot water easy. Since refrigeration equipment runs more than heat pumps, energy savings can be large for ground-coupled refrigeration. The paper presents a design procedure for ground loops for heat pumps, hot water, ice machines, and water-cooled refrigeration. It gives an overview of the commercial ground-coupled systems in Louisiana that have both refrigeration and heat pumps. Systems vary from small offices to a three-story office building with 187 tons. A chain of hamburger outlets uses total ground-coupling in all of its stores. A grocery store has ground-coupling for heat pumps and refrigeration. Desuperheaters provide 80 percent of the hot water for a coin laundry in the same building. A comparison of energy costs in a bank with a ground-coupled heat pump system to a similar bank with air-conditioning and gas for heat revealed a 31 percent reduction in utility costs for the ground-coupled building. Two buildings of the Mississippi Power and Light Co. have ground-coupled heat pumps in one, and high efficiency air source heat pumps in the other. Energy savings in nine months was 60,000 kWh (25 percent), and electric peak demand was reduced 42 kW (35 percent).

Braud, H. J.

1986-01-01T23:59:59.000Z

194

Closed inductively coupled plasma cell  

DOE Patents (OSTI)

A closed inductively coupled plasma cell generates a relatively high power, low noise plasma for use in spectroscopic studies is disclosed. A variety of gases can be selected to form the plasma to minimize spectroscopic interference and to provide a electron density and temperature range for the sample to be analyzed. Grounded conductors are placed at the tube ends and axially displaced from the inductive coil, whereby the resulting electromagnetic field acts to elongate the plasma in the tube. Sample materials can be injected in the plasma to be excited for spectroscopy. 1 fig.

Manning, T.J.; Palmer, B.A.; Hof, D.E.

1990-11-06T23:59:59.000Z

195

On Closed Shells in Nuclei  

DOE R&D Accomplishments (OSTI)

It has been suggested in the past that special numbers of neutrons or protons in the nucleus form a particularly stable configuration.{sup1} The complete evidence for this has never been summarized, nor is it generally recognized how convincing this evidence is. That 20 neutrons or protons (Ca{sup40}) form a closed shell is predicted by the Hartree model. A number of calculations support this fact.{sup2} These considerations will not be repeated here. In this paper, the experimental facts indicating a particular stability of shells of 50 and 82 protons and of 50, 82, and 126 neutrons will be listed.

Mayer, M. G.

1948-02-00T23:59:59.000Z

196

Bio-Polymer Hairpin Loops Sustained by Polarons  

E-Print Network (OSTI)

We show that polarons can sustain loop-like configurations in flexible bio-polymers and that the size of the loops depend on both the flexural rigidity of the polymer and the electron-phonon coupling constant. In particular we show that for single stranded DNA (ssDNA) such loops can have as little as 10 base pairs. For polyacetylene the shortest loop must have at least 12 nodes. We also show that these configurations are very stable under thermal fluctuations and can facilitate the formation of hairpin-loops of ssDNA.

B. Chakrabarti; B. Piette; W. J. Zakrzewski

2012-04-04T23:59:59.000Z

197

Bio-Polymer Hairpin Loops Sustained by Polarons  

E-Print Network (OSTI)

We show that polarons can sustain loop-like configurations in flexible bio-polymers and that the size of the loops depend on both the flexural rigidity of the polymer and the electron-phonon coupling constant. In particular we show that for single stranded DNA (ssDNA) such loops can have as little as 10 base pairs. For polyacetylene the shortest loop must have at least 12 nodes. We also show that these configurations are very stable under thermal fluctuations and can facilitate the formation of hairpin-loops of ssDNA.

Chakrabarti, B; Zakrzewski, W J

2012-01-01T23:59:59.000Z

198

Non-equilibrium of Ionization and the Detection of Hot Plasma in Nanoflare-heated Coronal Loops  

E-Print Network (OSTI)

Impulsive nanoflares are expected to transiently heat the plasma confined in coronal loops to temperatures of the order of 10 MK. Such hot plasma is hardly detected in quiet and active regions, outside flares. During rapid and short heat pulses in rarified loops the plasma can be highly out of equilibrium of ionization. Here we investigate the effects of the non-equilibrium of ionization (NEI) on the detection of hot plasma in coronal loops. Time-dependent loop hydrodynamic simulations are specifically devoted to this task, including saturated thermal conduction, and coupled to the detailed solution of the equations of ionization rate for several abundant elements. In our simulations, initially cool and rarified magnetic flux tubes are heated to 10 MK by nanoflares deposited either at the footpoints or at the loop apex. We test for different pulse durations, and find that, due to NEI effects, the loop plasma may never be detected at temperatures above ~5 MK for heat pulses shorter than about 1 min. We discuss some implications in the framework of multi-stranded nanoflare-heated coronal loops.

Fabio Reale; Salvatore Orlando

2008-05-22T23:59:59.000Z

199

Geothermal Loop Experimental Facility. Quarterly report, January--March 1978  

DOE Green Energy (OSTI)

The Geothermal Loop Experimental Facility (GLEF) utilizes a four stage flash/binary process for the extraction of energy from a high temperature, high salinity, liquid-dominated resource. Since plant start-up in May 1976, a substantial amount of information has been obtained on the operation of the plant, components, brine and steam composition, production and injection wells, and the potential of the Niland Reservoir. The general operation and activities of the GLEF during the period January 1978 through March 1978, are discussed. The production and injection well encountered no unusual difficulties. Scrubber performance tests were rerun this period and are discussed. Steam pH, conductivity, chemical composition, brine and scale properties, pigging, and component optimization efforts are discussed. The injection pump difficulties and condenser plugging problems are detailed. The feasibility study for a 50 MWe plant and H/sub 2/S abatement are discussed.

Bischoff, W.S.; Bishop, H.K.; Cooney, C.S.; Hanenburg, W.H.; Hoaglin, G.J.; Jacobson, W.O.; Mulliner, D.K.; Newell, D.G.; Swanson, C.R.

1978-04-01T23:59:59.000Z

200

Folding of a DNA Hairpin Loop Structure in Explicit Solvent Using Replica-Exchange Molecular Dynamics Simulations.  

DOE Green Energy (OSTI)

The research described in this product was performed in part in the Environmental Molecular Sciences Laboratory, a national scientific user facility sponsored by the Department of Energy's Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory. Hairpin loop structures are common motifs in folded nucleic acids. The 59-GCGCAGC sequence in DNA forms a characteristic and stable trinucleotide hairpin loop flanked by a two basepair stem helix. To better understand the structure formation of this hairpin loop motif in atomic detail, we employed replica-exchange molecular dynamics (RexMD) simulations starting from a single-stranded DNA conformation. In two independent 36 ns RexMD simulations, conformations in very close agreement with the experimental hairpin structure were sampled as dominant conformations (lowest free energy state) during the final phase of the RexMDs (;35% at the lowest temperature replica). Simultaneous compaction and accumulation of folded structures were observed. Comparison of the GCA trinucleotides from early stages of the simulations with the folded topology indicated a variety of central loop conformations, but arrangements close to experiment that are sampled before the fully folded structure also appeared. Most of these intermediates included a stacking of the C2 and G3 bases, which was further stabilized by hydrogen bonding to the A5 base and a strongly bound water molecule bridging the C2 and A5 in the DNA minor groove. The simulations suggest a folding mechanism where these intermediates can rapidly proceed toward the fully folded hairpin and emphasize the importance of loop and stem nucleotide interactions for hairpin folding. In one simulation, a loop motif with G3 in syn conformation (dihedral flip at N-glycosidic bond) accumulated, resulting in a misfolded hairpin. Such conformations may correspond to long-lived trapped states that have been postulated to account for the folding kinetics of nucleic acid hairpins that are slower than expected for a semiflexible polymer of the same size.

Kannan, Srinivasaraghavan; Zacharias, Martin W.

2007-11-01T23:59:59.000Z

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201

Gas Test Loop Booster Fuel Hydraulic Testing  

SciTech Connect

The Gas Test Loop (GTL) project is for the design of an adaptation to the Advanced Test Reactor (ATR) to create a fast-flux test space where fuels and materials for advanced reactor concepts can undergo irradiation testing. Incident to that design, it was found necessary to make use of special booster fuel to enhance the neutron flux in the reactor lobe in which the Gas Test Loop will be installed. Because the booster fuel is of a different composition and configuration from standard ATR fuel, it is necessary to qualify the booster fuel for use in the ATR. Part of that qualification is the determination that required thermal hydraulic criteria will be met under routine operation and under selected accident scenarios. The Hydraulic Testing task in the GTL project facilitates that determination by measuring flow coefficients (pressure drops) over various regions of the booster fuel over a range of primary coolant flow rates. A high-fidelity model of the NW lobe of the ATR with associated flow baffle, in-pile-tube, and below-core flow channels was designed, constructed and located in the Idaho State University Thermal Fluids Laboratory. A circulation loop was designed and constructed by the university to provide reactor-relevant water flow rates to the test system. Models of the four booster fuel elements required for GTL operation were fabricated from aluminum (no uranium or means of heating) and placed in the flow channel. One of these was instrumented with Pitot tubes to measure flow velocities in the channels between the three booster fuel plates and between the innermost and outermost plates and the side walls of the flow annulus. Flow coefficients in the range of 4 to 6.5 were determined from the measurements made for the upper and middle parts of the booster fuel elements. The flow coefficient for the lower end of the booster fuel and the sub-core flow channel was lower at 2.3.

Gas Test Loop Hydraulic Testing Staff

2006-09-01T23:59:59.000Z

202

The Polyakov loop and the hadron resonance gas model  

E-Print Network (OSTI)

The Polyakov loop has been used repeatedly as an order parameter in the deconfinement phase transition in QCD. We argue that, in the confined phase, its expectation value can be represented in terms of hadronic states, similarly to the hadron resonance gas model for the pressure. Specifically, L(T) \\approx 1/2\\sum_\\alpha g_\\alpha e^(-\\Delta_\\alpha/T), where g_\\alpha are the degeneracies and \\Delta_\\alpha are the masses of hadrons with exactly one heavy quark (the mass of the heavy quark itself being subtracted). We show that this approximate sum rule gives a fair description of available lattice data with N_f=2+1 at low temperatures by using the spectrum of hadrons containing one charmed quark, and the \\bar{MS}-scheme charmed quark mass. A direct fit to this latter quantity yields a close value, m_c=1280_{-44}^{+29}MeV. The lattice data are well reproduced by a simplified version of this formula, L(T)= N_f(2N_f+3)e^(-\\Delta/T), for T < 200 MeV and Delta=913(2)MeV. We argue that this number should be Delta ...

Megias, E; Salcedo, L L

2012-01-01T23:59:59.000Z

203

Coal Direct Chemical Looping (CDCL) Process Development  

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

increase in cost of electricity Future work * Test other fuels such as woody biomass and corn stover * Work closely with B&W to scale-up to pilot plant (3 MW th ) Accomplishments...

204

High-Resolution Design of a Protein Loop  

DOE Green Energy (OSTI)

Despite having irregular structure, protein loops often adopt specific conformations that are critical to protein function. Most studies in de novo protein design have focused on creating proteins with regular elements of secondary structure connected by very short loops or turns. To design longer protein loops that adopt specific conformations, we have developed a protocol within the Rosetta molecular modeling program that iterates between optimizing the sequence and conformation of a loop in search of low-energy sequence-structure pairs. We have tested the procedure by designing 10-residue loops for the connection between the second and third strand in the {beta}-sandwich protein tenascin. Three low-energy designs from 7,200 flexible backbone trajectories were selected for experimental characterization. All three designs, called LoopA, LoopB, and LoopC, adopt stable folded structures. High-resolution crystal structures of LoopA and LoopB have been solved. LoopB adopts a structure very similar to the design model (0.46 Angstroms rmsd), and all but one of the side chains are modeled in the correct rotamers. LoopA crystallized at low pH in a structure that differs dramatically from our design model. It forms a strand-swapped dimer mediated by hydrogen bonds to protonated glutamic acids. Gel filtration indicates that the protein is not a dimer at neutral pH. These results suggest that the high-resolution design of protein loops is possible; however, they also highlight how small changes in protein energetics can dramatically perturb the low free energy structure of a protein.

Hu,X.; Wang, H.; Ke, H.; Kuhlman, B.

2007-01-01T23:59:59.000Z

205

Scaling Laws and Temperature Profiles for Solar and Stellar Coronal Loops with Non-uniform Heating  

E-Print Network (OSTI)

The bulk of solar coronal radiative loss consists of soft X-ray emission from quasi-static loops at the cores of Active Regions. In order to develop diagnostics for determining the heating mechanism of these loops from observations by coronal imaging instruments, I have developed analytical solutions for the temperature structure and scaling laws of loop strands for a wide range of heating functions, including footpoint heating, uniform heating, and heating concentrated at the loop apex. Key results are that the temperature profile depends only weakly on the heating distribution -- not sufficiently to be of significant diagnostic value -- and that the scaling laws survive for this wide range of heating distributions, but with the constant of proportionality in the RTV scaling law ($P_{0}L \\thicksim T_{max}^3$) depending on the specific heating function. Furthermore, quasi-static analytical solutions do not exist for an excessive concentration of heating near the loop footpoints, a result in agreement with recent numerical simulations. It is demonstrated that a generalization of the solutions to the case of a strand with a variable diameter leads to only relatively small correction factors in the scaling laws and temperature profiles for constant diameter loop strands. A quintet of leading theoretical coronal heating mechanisms is shown to be captured by the formalism of this paper, and the differences in thermal structure between them may be verified through observations. Preliminary results from full numerical simulations demonstrate that, despite the simplifying assumptions, the analytical solutions from this paper are stable and accurate.

P. C. H. Martens

2008-04-14T23:59:59.000Z

206

GNSS dataless signal tracking with a delay semi-open loop and a phase open loop  

Science Conference Proceedings (OSTI)

In this article we propose to process the code and phase delay of a dataless GNSS signal in open and semi-open loops. The aims of this processing are to get an accurate estimate of the phase and code delays by integration of the GNSS signal. We show ... Keywords: Bayesian estimation, Circular estimation, GNSS signal processing

G. Stienne; S. Reboul; M. Azmani; J. B. Choquel; M. Benjelloun

2013-05-01T23:59:59.000Z

207

Loop Current Cycle: Coupled Response of the Loop Current with Deep Flows  

Science Conference Proceedings (OSTI)

Although the upper-layer dynamics of the Loop Current and eddies in the Gulf of Mexico are well studied, the understanding of how they are coupled to the deep flows is limited. In this work, results from a numerical model are analyzed to classify ...

Y.-L. Chang; L.-Y. Oey

2011-03-01T23:59:59.000Z

208

BAYESIAN MAGNETOHYDRODYNAMIC SEISMOLOGY OF CORONAL LOOPS  

SciTech Connect

We perform a Bayesian parameter inference in the context of resonantly damped transverse coronal loop oscillations. The forward problem is solved in terms of parametric results for kink waves in one-dimensional flux tubes in the thin tube and thin boundary approximations. For the inverse problem, we adopt a Bayesian approach to infer the most probable values of the relevant parameters, for given observed periods and damping times, and to extract their confidence levels. The posterior probability distribution functions are obtained by means of Markov Chain Monte Carlo simulations, incorporating observed uncertainties in a consistent manner. We find well-localized solutions in the posterior probability distribution functions for two of the three parameters of interest, namely the Alfven travel time and the transverse inhomogeneity length scale. The obtained estimates for the Alfven travel time are consistent with previous inversion results, but the method enables us to additionally constrain the transverse inhomogeneity length scale and to estimate real error bars for each parameter. When observational estimates for the density contrast are used, the method enables us to fully constrain the three parameters of interest. These results can serve to improve our current estimates of unknown physical parameters in coronal loops and to test the assumed theoretical model.

Arregui, I. [Departament de Fisica, Universitat de les Illes Balears, E-07122, Palma de Mallorca (Spain); Asensio Ramos, A., E-mail: inigo.arregui@uib.es, E-mail: aasensio@iac.es [Instituto de Astrofisica de Canarias, E-38205, La Laguna, Tenerife (Spain)

2011-10-10T23:59:59.000Z

209

Jordan cells of periodic loop models  

E-Print Network (OSTI)

Jordan cells in transfer matrices of finite lattice models are a signature of the logarithmic character of the conformal field theories that appear in their thermodynamical limit. The transfer matrix of periodic loop models, T_N, is an element of the periodic Temperley-Lieb algebra EPTL_N(\\beta, \\alpha), where N is the number of sites on a section of the cylinder, and \\beta = -(q+1/q) = 2 \\cos \\lambda and \\alpha the weights of contractible and non-contractible loops. The thermodynamic limit of T_N is believed to describe a conformal field theory of central charge c=1-6\\lambda^2/(\\pi(\\lambda-\\pi)). The abstract element T_N acts naturally on (a sum of) spaces V_N^d, similar to those upon which the standard modules of the (classical) Temperley-Lieb algebra act. These spaces known as sectors are labeled by the numbers of defects d and depend on a {\\em twist parameter} v that keeps track of the winding of defects around the cylinder. Criteria are given for non-trivial Jordan cells of T_N both between sectors with distinct defect numbers and within a given sector.

Alexi Morin-Duchesne; Yvan Saint-Aubin

2013-02-22T23:59:59.000Z

210

Free energy of static quarks and the renormalized Polyakov loop in full QCD  

E-Print Network (OSTI)

We present results from a detailed study of singlet free energies in full QCD with realistic quark masses. An improved scheme for the non-perturbative renormalization of the Polyakov loop is used and we compare its temperature dependence for QCD with different flavor content. We also analyze screening masses extracted from singlet free energies at various temperatures close to and above the QCD transition temperature. We conclude that the temperature dependence of screening masses is well described by perturbation theory up to a non-perturbative pre-factor. An effective running coupling has been determined for all temperature values giving additional insight into screening phenomena at high temperature.

K. Petrov; for the RBC-Bielefeld Collaboration

2007-10-23T23:59:59.000Z

211

The three loop slope of the Dirac form factor and the S Lamb shift in hydrogen  

DOE Green Energy (OSTI)

The last unknown contribution to hydrogen energy levels at order malpha{sup 7}, due to the slope of the Dirac form factor at three loops, is evaluated in a closed analytical form. The resulting shift of the hydrogen nS energy level is found to be 3.016/n{sup 3} kHz. Using the QED calculations of the 1S Lamb shift, the authors extract a precise value of the proton charge radius r{sub p} = 0.883{+-}0.014 fm.

Melnikov, K.

1999-12-08T23:59:59.000Z

212

An indicator energy of two close levels  

E-Print Network (OSTI)

In this paper, we introduce a concept of an indicator energy of two close levels in the perturbation.

Alexander V. Shamanin

2013-09-17T23:59:59.000Z

213

Center Late Opening or Early Closing  

Science Conference Proceedings (OSTI)

... Emergency Center Late Opening or Early Closing - Inclement Weather or Emergency Situation. ... Emergency Situation - "Shelter-in-Place" Plan. ...

2013-02-18T23:59:59.000Z

214

The Quantum Configuration Space of Loop Quantum Cosmology  

E-Print Network (OSTI)

The article gives an account of several aspects of the space known as the Bohr compactification of the line, featuring as the quantum configuration space in loop quantum cosmology, as well as of the corresponding configuration space realization of the so-called polymer representation. Analogies with loop quantum gravity are explored, providing an introduction to (part of) the mathematical structure of loop quantum gravity, in a technically simpler context.

J. M. Velhinho

2007-04-18T23:59:59.000Z

215

Geothermal Ground-Loop Preinstallation Project at Walden Pond  

Science Conference Proceedings (OSTI)

Geothermal ground-source heat pumps can help utilities increase electricity sales while reducing peak demands, but high ground-loop installation costs are a barrier to widespread acceptance. This project, conducted with Public Service Company of Indiana, demonstrated that mass installation of ground loops in a residential subdivision prior to home construction can substantially reduce installed cost for both horizontal and vertical loop configurations.

1990-09-05T23:59:59.000Z

216

Evolution and dynamics of cusped light-like Wilson loops  

E-Print Network (OSTI)

We discuss the possible relation between the singular structure of TMDs on the light-cone and the geometrical behaviour of rectangular Wilson loops.

Frederik F. Van der Veken

2013-02-27T23:59:59.000Z

217

Chemical Looping Combustion Prototype for CO2 Capture from Existing...  

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

looping combustion prototype based on successful development and testing of a 65 kW (thermal) pilot-scale system under a previous Department of Energy (DOE) cooperative...

218

Bosonic (meta)stabilization of cosmic string loops  

E-Print Network (OSTI)

We consider the possibility of a bosonic (meta)stabilization of a cosmic gauge string loop due to the presence of a gas of low mass bosonic particles which become trapped within the string core. This boson gas exerts a pressure which tends to counteract the string tension, allowing a circular string loop to find a finite equilibrium radius, provided that gas particles do not escape the string core. However, high energy bosons do escape, and consequently the loop shrinks and the temperature rises. Estimates indicate that the bosonic stabilization mechanism is ineffective, and the loop is unstable against decay.

J. R. Morris

2013-03-08T23:59:59.000Z

219

Chemical Looping Gasification for Hydrogen Enhanced Syngas Production...  

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

Chemical Looping Gasification for Hydrogen Enhanced Syngas Production with In-Situ CO2 Capture The Ohio State University (OSU) Project Number: FE0012136 Project Description The...

220

Experimental and computational studies of loop heat pipes.  

E-Print Network (OSTI)

??Computational and experimental investigations of fluid flow and heat transfer aspects of loop heat pipes (LHPs) are presented in this thesis. The overall goal is… (more)

Atabaki, Nima.

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "active closed loop" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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221

NETL: Novel Oxygen Carriers for Coal-Fueled Chemical Looping...  

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

Chemical Looping Combustion Project No.: DE-FE0001808 NETL has partnered with Western Kentucky University to develop a series of advanced oxygen carriers for coal-fueled...

222

Precipitation and scaling in dynamic geothermal systems. [Titanium loop facility  

DOE Green Energy (OSTI)

A dynamic loop facility for studying scaling in simulated geothermal brines--under conditions such as will be encountered in engineering scale heat transfer equipment is being constructed. The first phase of the program consists of two principal efforts: (1) modification of an existing 100 gpm titanium loop to provide the engineering scaling test facility and (2) operation of an approximately 1 gph once-through (experimental) system to provide design data for titanium loop modifications to provide experience with scale formation and characterization. This experience is being used in planning the scaling studies to be conducted in the dynamic loop facility. The status of the project is described.

Bohlmann, E.G.; Shor, A.J.; Berlinski, P.

1976-10-01T23:59:59.000Z

223

Chemical Looping Reforming for H2, CO and Syngas Production  

SciTech Connect

We demonstrate that the extension of CLC onto oxidants beyond air opens new, highly efficient pathways for production of ultra-pure hydrogen, activation of CO{sub 2} via reduction to CO, and are currently working on production of syngas using nanocomposite Fe-BHA. CLR hold great potential due to fuel flexibility and CO{sub 2} capture. Chemical Looping Combustion (CLC) is a novel clean combustion technology which offers an elegant and highly efficient route for fossil fuel combustion. In CLC, combustion of a fuel is broken down into two spatially separated steps. In the reducer, the oxygen carrier (typically a metal) supplies the stoichiometric oxygen required for fuel combustion. In the oxidizer, the oxygen-depleted carrier is then re-oxidized with air. After condensation of steam from the effluent of the reducer, a high-pressure, high-purity sequestration-ready CO{sub 2} stream is obtained. In the present study, we apply the CLC principle to the production of high-purity H{sub 2}, CO, and syngas streams by replacing air with steam and/or CO{sub 2} as oxidant, respectively. Using H{sub 2}O as oxidant, pure hydrogen streams can be obtained. Similarly, using CO{sub 2} as oxidant, CO is obtained, thus opening an efficient route for CO{sub 2} utilization. Using steam and CO{sub 2} mixtures for carrier oxidation should thus allow production of syngas with adjustable CO:H{sub 2} ratios. Overall, these processes result in Chemical Looping Reforming (CLR), i.e. the net overall reaction is the steam and/or dry reforming of the respective fuel.

Bhavsar,Saurabh; Najera,Michelle; Solunke,Rahul; Veser,Götz

2001-06-06T23:59:59.000Z

224

The Neftemash closed joint-stock company  

Science Conference Proceedings (OSTI)

The Neftemash closed joint-stock company was created from the VNIIneftemash Scientific Production Association in the privatization process in the country. Members of the Neftemash Co. are listed. This group of members determined the basic activities of the Neftemash Co. as a multifunctional scientific production complex for designing and manufacturing modern equipment for oil and gas production and refining. By having highly qualified specialists, modern enterprises, test experience, and production capacity, this company is the leading organization in Russia and the Commonwealth of Independent States (CIS) for supplying oil and gas enterprises with petroleum equipment. The Neftemash Co. designs and produces drilling, geological prospecting, and petroleum production equipment and instrumentation. It designs oil and gas refining equipment and petrochemical equipment, equipment for processing coal and liquid fuels, including integrated automated production lines. It does fundamental and applied research in materials science, welding, and corrosion protection for oil and gas production and refining equipment. It designs ecologically safe equipment complexes for drilling wells and refining oil and gas. To a significant extent the petroleum industry in Russia was developed from the activity of the All-Union Scientific Research, Design, and Construction Institute for Petroleum Machinery. Equipment designed by the institute was used to explore, develop, and exploit oil and gas fields of western Siberia, the far north, and other petroleum regions of the country.

Umanchik, N.P.

1995-07-01T23:59:59.000Z

225

Inertially stabilized platforms for SATCOM on-the-move applications : a hybrid open/closed-loop antenna pointing strategy  

E-Print Network (OSTI)

The increasing need for timely information in any environment has led to the development of mobile SATCOM terminals. SATCOM terminals seeking to achieve high data-rate communications require inertial antenna pointing to ...

Marsh, Eric Allen

2008-01-01T23:59:59.000Z

226

Fast Model Based Approximation of the Closed-loop Performance Limits of Gas/Liquid Inline Separators for Accelerated Design  

E-Print Network (OSTI)

trend in the oil and gas (exploration & production) industry is to use compact ­centrifugal forces based.fuenmayor@shell.com, ruud.henkes@shell.com) Abstract: A current trend in the oil and gas industry is to use compact so, oil and gas industry, slug control, model based control, feedforward control 1. INTRODUCTION A current

Van den Hof, Paul

227

Logistics 1: closed-loop, simulation-based, systems engineering approach to life cycle management of defense systems  

Science Conference Proceedings (OSTI)

Assessing the life-cycle impacts of operations and maintenance decisions made for new or aging systems requires an accurate ability to measure and respond to uncertainty. Maintenance and parts requirements forecasts for fielded military systems are traditionally ...

Sean Connors; Julie Gauldin; Marshall Smith

2002-12-01T23:59:59.000Z

228

Program on Technology Innovation: Geothermal Energy Harvesting from a Closed-Loop Single-Well Heat Exchanger Technology  

Science Conference Proceedings (OSTI)

From the perspective of reducing the cost of an enhanced geothermal system (EGS) that requires injection and productions wells, a single-wellbore configuration could be a cost-efficient solution for larger geothermal plants that are constrained by water demand. The applicability of a single-wellbore configuration depends on the ability to have high thermal conductivity with the heat exchange from the rock system surrounding it. The result of the Polaris award work suggests that a numerical model is neede...

2010-11-30T23:59:59.000Z

229

Investigation of the MTC noise estimation with a coupled neutronic/thermal-hydraulic dedicated model - 'Closing the loop'  

Science Conference Proceedings (OSTI)

This paper investigates the reliability of different noise estimators aimed at determining the Moderator Temperature Coefficient (MTC) of reactivity in Pressurized Water Reactors. By monitoring the inherent fluctuations in the neutron flux and moderator temperature, an on-line monitoring of the MTC without perturbing reactor operation is possible. In order to get an accurate estimation of the MTC by noise analysis, the point-kinetic component of the neutron noise and the core-averaged moderator temperature noise have to be used. Because of the scarcity of the in-core instrumentation, the determination of these quantities is difficult, and several possibilities thus exist for estimating the MTC by noise analysis. Furthermore, the effect of feedback has to be negligible at the frequency chosen for estimating the MTC in order to get a proper determination of the MTC. By using an integrated neutronic/thermal- hydraulic model specifically developed for estimating the three-dimensional distributions of the fluctuations in neutron flux, moderator properties, and fuel temperature, different approaches for estimating the MTC by noise analysis can be tested individually. It is demonstrated that a reliable MTC estimation can only be provided if the core is equipped with a sufficient number of both neutron detectors and temperature sensors, i.e. if the core contain in-core detectors monitoring both the axial and radial distributions of the fluctuations in neutron flux and moderator temperature. It is further proven that the effect of feedback is negligible for frequencies higher than 0.1 Hz, and thus the MTC noise estimations have to be performed at higher frequencies. (authors)

Demaziere, C.; Larsson, V. [Div. of Nuclear Engineering, Dept. of Applied Physics, Chalmers Univ. of Technology, SE-41296 Gothenburg (Sweden)

2012-07-01T23:59:59.000Z

230

Closed-Loop Simulation of Model-Based Current Profile Control with the DIII-D Plasma Control System  

E-Print Network (OSTI)

Bull. Am. Phys. Soc. 55, 131 (2010)52nd American Physical Society Annual Meeting of Division of Plasma Physics Chicago Illinois, US, 2010999618145

Barton, J.E.

2010-08-24T23:59:59.000Z

231

Closed-loop biomass co-firing in a laboratory reactor and in a full-scale boiler.  

DOE Green Energy (OSTI)

Co-firing tests were conducted in a pilot-scale reactor at Sandia National Laboratories and in a boiler at the Hawaiian Commercial & Sugar factory at Puunene, Hawaii. Combustion tests were performed in the Sandia Multi-Fuel Combustor using Australian coal, whole fiber cane including tops and leaves processed at three different levels (milled only, milled and leached, and milled followed by leaching and subsequent milling), and fiber cane stripped of its tops and leaves and heavily processed through subsequent milling, leaching, and milling cycles. Testing was performed for pure fuels and for biomass co-firing with the coal at levels of 30% and 70% by mass. The laboratory tests revealed the following information: (1) The biomass fuels convert their native nitrogen into NO more efficiently than coal because of higher volatile content and more reactive nitrogen complexes. (2) Adding coal to whole fiber cane to reduce its tendency to form deposits should not adversely affect NO emissions. ( 3 ) Stripped cane does not offer a NO advantage over whole cane when co-fired with coal. During the field test, Sandia measured 0 2 , C02, CO, SO2, and NO concentrations in the stack and gas velocities near the superheater. Gas concentrations and velocities fluctuated more during biomass co-firing than during coal combustion. The mean 0 2 concentration was lower and the mean C02 concentration was higher during biomass co-firing than during coal combustion. When normalized to a constant exhaust 0 2 concentration, mean CO concentration was higher and mean NO concentration was lower for biomass co-firing than for coal. The SO2 concentration tracked the use of Bunker C fuel oil. When normalized by the amount of boiler energy input, the amounts of NO and SO2 formed were lower during biomass co-firing than during coal combustion. The difference between NOx trends in the lab and in the field are most likely a result of less effective heat and mass transfer in the boiler. Particles were sampled near the superheater tube using an impaction probe and were analyzed using scanning electron microscopy. Particle loading appeared higher for biomass co-firing than for coal combustion, especially for the smaller particle diameters. Laser-induced breakdown spectroscopy (LIBS) was used to detect silicon, aluminum, titanium, iron, calcium, magnesium, sodium, and potassium concentrations near the superheater. LIBS provided an abundant amount of real-time information. The major constituents of the fuel ash (silicon and aluminum) were also the major measured inorganic constituents of the combustion products. The combustion products were enriched in sodium relative to the fuel ash during all tests, and they were enriched in potassium for the biomass co-firing tests. Alkali metals are enriched because compounds containing these elements are more readily releasable into the combustion products than refractory components that remain in large particles such as silicon, aluminum, and titanium. Relative to the measured deposit chemistry, the combustion flows were enriched in iron, sodium, and potassium, constituents that are known to form fumes laden with fine particles and/or vapors. The LIBS results yield insight into the deposition mechanism: Impaction of larger particles dominates over fume deposition. The present application of LIBS reveals its potential to provide real-time field information on the deposition propensity of different fuels and the effects of different fuels and boiler operating conditions.

Jenkins, Bryan M. (University of California, Davis, CA); Williams, Robert B. (University of California, Davis, CA); Turn, Scott Q. (Hawaii Natural Energy Institute.); Jakeway, Lee A. (Hawaiian Commercial & Sugar Company); Blevins, Linda Gail

2004-05-01T23:59:59.000Z

232

Closed-loop biomass co-firing. Quarterly technical progress report for the period October - December 1999  

DOE Green Energy (OSTI)

Tasks included the following: analyze data from small plot harvests; large-scale planting of high-fiber cane variety; pilot-scale testing of fuel blends; procuring harvest equipment; perform harvest and co-firing trials for full-scale demonstration.

Jakeway, Lee; Nakahata, Mae

2000-01-01T23:59:59.000Z

233

Integrated Framework toward a Closed Loop Measurement and Verification Shankar Earni, Phil Coleman, Mark Sanders, Lawrence Berkeley National Laboratory  

E-Print Network (OSTI)

aging buildings to achieve desired building occupant comfort needed to maintain worker productivity companies (ESCOs). An ESPC project allows an agency to reallocate its utility and building O&M expenses to pay for energy system infrastructure improvements from the resulting cost savings. In ESPCs

234

ABJ Fractional Brane from ABJM Wilson Loop  

E-Print Network (OSTI)

We present a new Fermi gas formalism for the ABJ matrix model. This formulation takes a form that identifies the effect of the fractional M2-brane in the ABJ matrix model as that of a composite Wilson loop operator in the corresponding ABJM matrix model. Using this formalism, we study the phase dependence of the ABJ partition function numerically and find a simple rule for it. We further compute first few exact values at some coupling constants. Fitting these exact values against the expected form of the grand potential we can write down the grand potential with exact coefficients. The results at various coupling constants enable us to conjecture an explicit form of the grand potential for general coupling constants. This matches with a natural generalization of the perturbative sum, worldsheet instantons and bound states from the ABJM matrix model, but contains a minor difference in the membrane instantons.

Sho Matsumoto; Sanefumi Moriyama

2013-10-30T23:59:59.000Z

235

Geothermal Loop Experimental Facility. Final report  

DOE Green Energy (OSTI)

Research at the Geothermal Loop Experimental Facility was successfully concluded in September 1979. In 13,000 hours of operation over a three and one half year period, the nominal 10 megawatt electrical equivalent GLEF provided the opportunity to identify problems in working with highly saline geothermal fluids and to develop solutions that could be applied to a commercial geothermal power plant producing electricity. A seven and one half year period beginning in April 1972, with early well flow testing and ending in September 1979, with the completion of extensive facility and reservoir operations is covered. During this period, the facility was designed, constructed and operated in several configurations. A comprehensive reference document, addressing or referencing documentation of all the key areas investigated is presented.

Not Available

1980-04-01T23:59:59.000Z

236

URANIUM-BISMUTH IN-PILE CORROSION TEST LOOP. RADIATION LOOP NO. 1  

SciTech Connect

A loop was operated in the Brookhaven Graphite Research Reactor to determine the effect of in-pile irradiation on the corrosion of various materials by a U-- Bi solution. The loop wws fabricated of 21/4% chrome-1% Mo steel and contained, in the in-pile section, specimens of low-chrome steels, C steel, Mo, Be, Ta, and graphite. The U--Bi solution containing 869 ppm U/sup 235/ 98 ppm U/ sup 238/, 236 ppm Zr, and 346 ppm Mg was circulated at 51/4 gpm. A temperature difference of 75 deg C was maintained on the loop. The in-pile test section ran at 500 deg C and the finned cooler section at 425 deg C. The in-pile test section was exposed to a neutron flux of 4.4 x 10/sup 12/ neutrons/cm/sup 2/-sec which provided a fission density of 5.5 x 10/sup 10/ fissions/cm/sup 3/-sec. Metallographic examination indicated that the corrosion and/or erosion of the steel and graphite specimens was nil. Wetting of the specimens by the U-Bi solution was limited. Results indicate that in-pile and out-of-pile experimental results are similar and that fission fragment recoils did not contribute materially to either wetting or corrosion under the conditions imposed in this test. (auth)

Waide, C.H.; Kukacka, L.E.; Meyer, R.A.; Milau, J.; Klein, J.H.; Chow, J.G.Y.; Klamut, C.J.; Gurinsky, D.H.

1961-05-01T23:59:59.000Z

237

Feature Exploration for Mining Coronal Loops from Solar Images  

Science Conference Proceedings (OSTI)

Coronal loops are especially important in analyzing some important phenomena related to the Sun such as the controversial coronal heating problem. The analysis requires astrophysicists to manually sift through thousands of images in order to acquire ... Keywords: feature extraction, coronal loops, SOHO, data mining, solar

Nurcan Durak; Olfa Nasraoui

2008-11-01T23:59:59.000Z

238

Singlet Free Energies and Renormalized Polyakov Loop in full QCD  

E-Print Network (OSTI)

We calculate the free energy of a static quark anti-quark pair and the renormalized Polyakov loop in 2+1- and 3- flavor QCD using $16^3 \\times 4$ and $16^3 \\times 6$ lattices and improved staggered p4 action. We also compare the renormalized Polyakov loop with the results of our earlier studies.

K. Petrov

2006-10-05T23:59:59.000Z

239

Electricity generation with looped transmission networks: Bidding to an ISO  

E-Print Network (OSTI)

Electricity generation with looped transmission networks: Bidding to an ISO Xinmin Hu Daniel Ralph to model markets for delivery of electrical power on looped transmission networks. It analyzes in transmission capacity mean the ISO potentially sets a different electricity price at each node of the trans

Ferris, Michael C.

240

The Spectrum of Loop Current Variability from Gappy Data  

Science Conference Proceedings (OSTI)

The goal of this work was to understand the rate at which large anticyclonic rings are shed from the Loop Current in the Gulf of Mexico. The northward penetration of the Loop Current is used here as a surrogate variable. Data are primarily from ...

Wilton Sturges

1992-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "active closed loop" 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

Closing Rocky Flats by 2006  

Science Conference Proceedings (OSTI)

Safely accelerating the closure of Rocky Flats to 2006 is a goal shared by many: the State of Colorado, the communities surrounding the site, the U.S. Congress, the Department of Energy, Kaiser-Hill and its team of subcontractors, the site's employees, and taxpayers across the country. On June 30, 2000, Kaiser-Hill (KH) submitted to the Department of Energy (DOE), KH's plan to achieve closure of Rocky Flats by December 15, 2006, for a remaining cost of $3.96 billion (February 1, 2000, to December 15, 2006). The Closure Project Baseline (CPB) is the detailed project plan for accomplishing this ambitious closure goal. This paper will provide a status report on the progress being made toward the closure goal. This paper will: provide a summary of the closure contract completion criteria; give the current cost and schedule variance of the project and the status of key activities; detail important accomplishments of the past year; and discuss the challenges ahead.

Tuor, N. R.; Schubert, A. L.

2002-02-26T23:59:59.000Z

242

Solid looping cycles: A new technology for coal conversion  

SciTech Connect

This article examines both oxygen looping cycles (otherwise known as chemical looping combustion), and lime-based CO{sub 2} looping cycles, where calcined limestone is used for in situ CO{sub 2} capture. There has been a rapid rise in the amount of research carried out recently, and both technologies are likely to see practical application in the near future. However, these technologies urgently require demonstration at the large pilot-plant level - in the case of chemical looping cycles for use with high-pressure syngas of the type likely to be produced by current coal gasification technologies and in the case of CO{sub 2} looping cycles both for combustion and gasification applications with coal. Both approaches have potential for application in schemes for H{sub 2} production, but these have not been considered here, although such applications will also inevitably follow in the medium to long term.

Anthony, E.J. [CANMET Energy Technology Centre Ottawa, Ottawa, ON (Canada). Natural Resources Canada

2008-03-19T23:59:59.000Z

243

A thermodynamic model for agglomeration of DNA-looping proteins  

E-Print Network (OSTI)

In this paper, we propose a thermodynamic mechanism for the formation of transcriptional foci via the joint agglomeration of DNA-looping proteins and protein-binding domains on DNA: The competition between the gain in protein-DNA binding free energy and the entropy loss due to DNA looping is argued to result in an effective attraction between loops. A mean-field approximation can be described analytically via a mapping to a restricted random-graph ensemble having local degree constraints and global constraints on the number of connected components. It shows the emergence of protein clusters containing a finite fraction of all looping proteins. If the entropy loss due to a single DNA loop is high enough, this transition is found to be of first order.

Sumedha; Martin Weigt

2008-01-09T23:59:59.000Z

244

Complete algebraic reduction of one-loop tensor Feynman integrals  

SciTech Connect

We set up a new, flexible approach for the tensor reduction of one-loop Feynman integrals. The 5-point tensor integrals up to rank R=5 are expressed by 4-point tensor integrals of rank R-1, such that the appearance of the inverse 5-point Gram determinant is avoided. The 4-point tensor coefficients are represented in terms of 4-point integrals, defined in d dimensions, 4-2{epsilon}{<=}d{<=}4-2{epsilon}+2(R-1), with higher powers of the propagators. They can be further reduced to expressions which stay free of the inverse 4-point Gram determinants but contain higher-dimensional 4-point integrals with only the first power of scalar propagators, plus 3-point tensor coefficients. A direct evaluation of the higher-dimensional 4-point functions would avoid the appearance of inverse powers of the Gram determinants completely. The simplest approach, however, is to apply here dimensional recurrence relations in order to reduce them to the familiar 2- to 4-point functions in generic dimension d=4-2{epsilon}, introducing thereby coefficients with inverse 4-point Gram determinants up to power R for tensors of rank R. For small or vanishing Gram determinants--where this reduction is not applicable--we use analytic expansions in positive powers of the Gram determinants. Improving the convergence of the expansions substantially with Pade approximants we close up to the evaluation of the 4-point tensor coefficients for larger Gram determinants. Finally, some relations are discussed which may be useful for analytic simplifications of Feynman diagrams.

Fleischer, J. [Fakultaet fuer Physik, Universitaet Bielefeld, Universitaetsstrasse 25, 33615 Bielefeld (Germany); Riemann, T. [Deutsches Elektronen-Synchrotron, DESY, Platanenallee 6, 15738 Zeuthen (Germany)

2011-04-01T23:59:59.000Z

245

Simultaneous activation of multiple memory systems during learning : insights from electrophysiology and modeling  

E-Print Network (OSTI)

Parallel cortico-basal ganglia loops are thought to give rise to a diverse set of limbic, associative and motor functions, but little is known about how these loops operate and how their neural activities evolve during ...

Thorn, Catherine A. (Catherine Ann), 1980-

2010-01-01T23:59:59.000Z

246

TS LOOP NON-POTABLE PUMP EVALUATION  

SciTech Connect

This analysis evaluates the existing subsurface non-potable water system from the portal pump to the end of the water line in the South Ramp and determines if the pump size and spacing meets the system pressure and flow requirements for construction operations and incipient fire fighting capability as established in the Subsurface Fire Hazards Analysis (CRWMS M&O 1998b). This analysis does not address the non potable water system in the Cross Drift which is covered under a previous design analysis (CRWMS-M&O 1998a). The Subsurface Fire Hazards Analysis references sections of OSHA 29 CFR 1910 Subpart L for requirements applicable to the incipient fire fighting hose stations used underground. This analysis does not address mechanical system valves, fittings, risers and other components of the system piping. This system is not designed or intended to meet all National Fire Protection Association (NFPA) codes for a fire fighting system but is only considered a backup system to fire extinguishers that are installed throughout the Topopah Springs (TS) Loop and may be used to fight small incipient stage fires.

S. Goodin

1999-05-14T23:59:59.000Z

247

Consistent probabilities in loop quantum cosmology  

E-Print Network (OSTI)

A fundamental issue for any quantum cosmological theory is to specify how probabilities can be assigned to various quantum events or sequences of events such as the occurrence of singularities or bounces. In previous work, we have demonstrated how this issue can be successfully addressed within the consistent histories approach to quantum theory for Wheeler-DeWitt-quantized cosmological models. In this work, we generalize that analysis to the exactly solvable loop quantization of a spatially flat, homogeneous and isotropic cosmology sourced with a massless, minimally coupled scalar field known as sLQC. We provide an explicit, rigorous and complete decoherent histories formulation for this model and compute the probabilities for the occurrence of a quantum bounce vs. a singularity. Using the scalar field as an emergent internal time, we show for generic states that the probability for a singularity to occur in this model is zero, and that of a bounce is unity, complementing earlier studies of the expectation values of the volume and matter density in this theory. We also show from the consistent histories point of view that all states in this model, whether quantum or classical, achieve arbitrarily large volume in the limit of infinite `past' or `future' scalar `time', in the sense that the wave function evaluated at any arbitrary fixed value of the volume vanishes in that limit. Finally, we briefly discuss certain misconceptions concerning the utility of the consistent histories approach in these models.

David A. Craig; Parampreet Singh

2013-06-26T23:59:59.000Z

248

Laser photon statistics in the feedback loop  

E-Print Network (OSTI)

A mere correspondence between the electron statistics and the photon one vanishes in the feedback loop (FBL). It means that the direct photodetection, supplying us with the electron statistics, does not provide us with a wished information about the laser photon statistics. For getting this information we should think up another measurement procedure, and we in the article suggest applying the three-level laser as a auxiliary measuring device. This laser has impressive property, namely, its photon statistics survive information about the initial photon statistics of the laser which excites coherently the three-level medium. Thus, if we choose the laser in the FBL as exciting the three-level laser, then we have an possibility to evaluate its initial photon statistics by means of direct detecting the three-level laser emission. Finally, this approach allows us to conclude the feedback is not capable of creating a regularity in the laser light beam. Contrary, the final photon fluctuations turn out to be always even bigger. The mentioned above feature of the three-level laser takes place only for the strong interaction between the lasers (exciting and excited). It means the initial state of the exciting laser is changed dramatically, so our measurement procedure can not be identified with some non-demolition one.

T. Yu. Golubeva; Yu. M. Golubev

2005-04-23T23:59:59.000Z

249

EXAMINATION OF Zr AND Ti RECOMBINER LOOP SPECIMENS  

DOE Green Energy (OSTI)

Cold-worked specimens of iodide zirconium, Zircaloy-2, iodide titanium, and A-55 titanium were tested in a high-pressure recombiner loop in an attempt to duplicate anomalous results obtained in a prior recombiner loop. Hydrogen analyses and metallographic examinations were made on all specimens. The titanium materials and Zircaloy-2 picked up major amounts of hydrogen in the cell section. None of the materials tested showed appreciable hydrogen absorption in the recombiner section. Complete recrystallization occurred in all cell specimens while only Zircaloy-2, of the recombiner specimens, showed any degree of recrystallization. No explanation for this behavior can be given. A survnnary of the data obtained in previous recombiner loops is compared with the results of this loop. Conclusions were based on the results of three recombiner loops. Primarlly because of the hydrogen absorption data obtained in all three recombiner loops it is recommended that the zirconium and titunium materials tested not be used in environments similar to those encountered in high pressure recombiner loops. (auth)

Rittenhouse, P.L.

1958-12-19T23:59:59.000Z

250

Observation of multiple sausage oscillations in cool postflare loop  

E-Print Network (OSTI)

Using simultaneous high spatial (1.3 arc sec) and temporal (5 and 10 s) resolution H-alpha observations from the 15 cm Solar Tower Telescope at ARIES, we study the oscillations in the relative intensity to explore the possibility of sausage oscillations in the chromospheric cool postflare loop. We use standard wavelet tool, and find the oscillation period of ~ 587 s near the loop apex, and ~ 349 s near the footpoint. We suggest that the oscillations represent the fundamental and the first harmonics of fast sausage waves in the cool postflare loop. Based on the period ratio P1/P2 ~ 1.68, we estimate the density scale height in the loop as ~ 17 Mm. This value is much higher than the equilibrium scale height corresponding to H-alpha temperature, which probably indicates that the cool postflare loop is not in hydrostatic equilibrium. Seismologically estimated Alfv\\'en speed outside the loop is ~ 300-330 km/s. The observation of multiple oscillations may play a crucial role in understanding the dynamics of lower solar atmosphere, complementing such oscillations already reported in the upper solar atmosphere (e.g., hot flaring loops).

A. K. Srivastava; T. V. Zaqarashvili; W. Uddin; B. N. Dwivedi; Pankaj Kumar

2008-06-05T23:59:59.000Z

251

Gas mixtures for spark gap closing switches  

DOE Patents (OSTI)

Gas mixtures for use in spark gap closing switches comprised of fluorocarbons and low molecular weight, inert buffer gases. To this can be added a third gas having a low ionization potential relative to the buffer gas. The gas mixtures presented possess properties that optimized the efficiency spark gap closing switches. 6 figs.

Christophorou, L.G.; McCorkle, D.L.; Hunter, S.R.

1987-02-20T23:59:59.000Z

252

Automatically closing swing gate closure assembly  

DOE Patents (OSTI)

A swing gate closure assembly for nuclear reactor tipoff assembly wherein the swing gate is cammed open by a fuel element or spacer but is reliably closed at a desired closing rate primarily by hydraulic forces in the absence of a fuel charge.

Chang, Shih-Chih (Richland, WA); Schuck, William J. (Richland, WA); Gilmore, Richard F. (Kennewick, WA)

1988-01-01T23:59:59.000Z

253

activities  

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

Detecting Things We Cannot See: Learning the Concepts of Control and Detecting Things We Cannot See: Learning the Concepts of Control and Variable in an Experiment Submitted by Anita Brook-Dupree, 1996 TRAC teacher at Fermilab, Teacher, Alternative Middle Years School, Philadelphia, PA. Particle physicists at Fermilab in Batavia, Illinois are faced with the problem of detecting the presence of sub-atomic particles they cannot see. During my summer as a TRAC teacher at Fermilab, I tried to think of ways to teach middle school students about things we cannot see. I want to thank my nine-year-old daughter Gia for the idea for the following activity. I was lamenting that I could not come up with ideas of how to relate the work of Fermilab scientists to anything that my students would understand. Then I was reminded by my daughter, that when I brought her to school on the

254

Iterational retiming: Maximize iteration-level parallelism for nested loops  

E-Print Network (OSTI)

Nested loops are the most critical sections in many scientific and Digital Signal Processing (DSP) applications. It is important to study effective and efficient transformation techniques to increase parallelism for nested loops. In this paper, we propose a novel technique, iterational retiming, that can satisfy any given timing constraint by achieving full parallelism for iterations in a partition. Theorems and efficient algorithms are proposed for iterational retiming. The experimental results show that iterational retiming is a promising technique for parallel embedded systems. It can achieve 87% improvement over software pipelining and 88 % improvement over loop unfolding on average.

Chun Xue; Zili Shao; Meilin Liu; Edwin H. -m. Sha

2005-01-01T23:59:59.000Z

255

Zipping and Unzipping of Cosmic String Loops in Collision  

E-Print Network (OSTI)

In this paper the collision of two cosmic string loops is studied. After collision junctions are formed and the loops are entangled. We show that after their formation the junctions start to unzip and the loops disentangle. This analysis provides a theoretical understanding of the unzipping effect observed in numerical simulations of a network of cosmic strings with more than one type of cosmic strings. The unzipping phenomena have important effects in the evolution of cosmic string networks when junctions are formed upon collision, such as in a network of cosmic superstrings.

Hassan Firouzjahi; Johanna Karouby; Shahram Khosravi; Robert Brandenberger

2009-07-28T23:59:59.000Z

256

Equivalence of string and fusion loop-spin structures  

E-Print Network (OSTI)

The importance of the fusion relation of loops was recognized in the context of spin structures on the loop space by Stolz and Teichner and further developed by Waldorf. On a spin manifold M the equivalence classes of `fusive' spin structures on the loop space LM, incorporating the fusion property, strong regularity and reparameterization-invariance, are shown to be in 1-1 correspondence with equivalence classes of string structures on M. The identification is through the affine space of `string' cohomology classes considered by Redden.

Chris Kottke; Richard Melrose

2013-09-01T23:59:59.000Z

257

Fiber-bragg grating-loop ringdown method and apparatus  

Science Conference Proceedings (OSTI)

A device comprising a fiber grating loop ringdown (FGLRD) system of analysis is disclosed. A fiber Bragg grating (FBG) or Long-Period grating (LPG) written in a section of single mode fused silica fiber is incorporated into a fiber loop. By utilizing the wing areas of the gratings' bandwidth as a wavelength dependent attenuator of the light transmission, a fiber grating loop ringdown concept is formed. One aspect of the present invention is temperature sensing, which has been demonstrated using the disclosed device. Temperature measurements in the areas of accuracy, stability, high temperature, and dynamic range are also described.

Wang, Chuji (Starkville, MS)

2008-01-29T23:59:59.000Z

258

Fiber-bragg grating-loop ringdown method and apparatus  

DOE Patents (OSTI)

A device comprising a fiber grating loop ringdown (FGLRD) system of analysis is disclosed. A fiber Bragg grating (FBG) or Long-Period grating (LPG) written in a section of single mode fused silica fiber is incorporated into a fiber loop. By utilizing the wing areas of the gratings' bandwidth as a wavelength dependent attenuator of the light transmission, a fiber grating loop ringdown concept is formed. One aspect of the present invention is temperature sensing, which has been demonstrated using the disclosed device. Temperature measurements in the areas of accuracy, stability, high temperature, and dynamic range are also described.

Wang, Chuji (Starkville, MS)

2008-01-29T23:59:59.000Z

259

Boosted Fast Flux Loop Alternative Cooling Assessment  

Science Conference Proceedings (OSTI)

The Gas Test Loop (GTL) Project was instituted to develop the means for conducting fast neutron irradiation tests in a domestic radiation facility. It made use of booster fuel to achieve the high neutron flux, a hafnium thermal neutron absorber to attain the high fast-to-thermal flux ratio, a mixed gas temperature control system for maintaining experiment temperatures, and a compressed gas cooling system to remove heat from the experiment capsules and the hafnium thermal neutron absorber. This GTL system was determined to provide a fast (E > 0.1 MeV) flux greater than 1.0E+15 n/cm2-s with a fast-to-thermal flux ratio in the vicinity of 40. However, the estimated system acquisition cost from earlier studies was deemed to be high. That cost was strongly influenced by the compressed gas cooling system for experiment heat removal. Designers were challenged to find a less expensive way to achieve the required cooling. This report documents the results of the investigation leading to an alternatively cooled configuration, referred to now as the Boosted Fast Flux Loop (BFFL). This configuration relies on a composite material comprised of hafnium aluminide (Al3Hf) in an aluminum matrix to transfer heat from the experiment to pressurized water cooling channels while at the same time providing absorption of thermal neutrons. Investigations into the performance this configuration might achieve showed that it should perform at least as well as its gas-cooled predecessor. Physics calculations indicated that the fast neutron flux averaged over the central 40 cm (16 inches) relative to ATR core mid-plane in irradiation spaces would be about 1.04E+15 n/cm2-s. The fast-to-thermal flux ratio would be in excess of 40. Further, the particular configuration of cooling channels was relatively unimportant compared with the total amount of water in the apparatus in determining performance. Thermal analyses conducted on a candidate configuration showed the design of the water coolant and Al-Hf alloy heat sink system is capable of maintaining all system components below their maximum temperature limits. The maximum temperature of this conduction cooling system, 224.2°C (435.6 °F) occurs in a small, localized region in the heat sink structure near the core mid-plane. The total coolant flow rate requirement for this configuration is 207 L/min (54.7 gpm). The calculated Flow Instability Ratio and Departure from Nucleate Boiling Ratio for this configuration under nominal conditions are 6.5 and 8.0, respectively, which safely exceed the minimum values of 2.0. Materials and fabrication issues inspection revealed that the neutron absorber would probably best be made from powdered Al3Hf mixed with aluminum powder and extruded or hot isostatically pressed. Although Al3Hf has not been specifically studied extensively, its mechanical and chemical properties should be very much like Al3Zr, which has been studied. Its behavior under irradiation should be very satisfactory, and resistance to corrosion will be investigated to a limited extent in planned miniplate irradiation tests in ATR. Pressurized water systems needed to effect heat removal are already available in the ATR complex, and mixed gas temperature control systems needed to trim experiment temperatures have been engineered and need only be fabricated and installed. In sum, it appears the alternately cooled configuration arrived at can be very successful. The cost estimate for this configuration indicates to

Glen R. Longhurst; Donna Post Guillen; James R. Parry; Douglas L. Porter; Bruce W. Wallace

2007-08-01T23:59:59.000Z

260

Building Energy Software Tools Directory: Ground Loop Design  

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

Ground Loop Design Ground Loop Design Ground Loop Design logo Ground Loop Design is a versatile ground source heat pump system design program that helps the trained geothermal HVAC designer/engineer size equipment, determine the correct lengths of bore or pipe required for commercial projects, optimize the piping configuration for balanced flow and optimal heat transfer, and calculate the annual and lifetime energy/operating/emissions costs associated with the design. The modular program enhances design productivity and permits flexibility in the designing process and customization based on designer preferences. It also has an English/metric conversion engine and is available in many languages, providing applicability to the widest range of equipment and customers. Screen Shots

Note: This page contains sample records for the topic "active closed loop" 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

High Spatial Resolution Observations of Loops in the Solar Corona  

E-Print Network (OSTI)

Understanding how the solar corona is structured is of fundamental importance to determining how the Sun's upper atmosphere is heated to high temperatures. Recent spectroscopic studies have suggested that an instrument with a spatial resolution of 200km or better is necessary to resolve coronal loops. The High Resolution Coronal Imager (Hi-C) achieved this performance on a rocket flight in July 2012. We use Hi-C data to measure the Gaussian widths of 91 loops observed in the solar corona and find a distribution that peaks at about 270km. We also use Atmospheric Imaging Assembly (AIA) data for a subset of 79 of these loops and find that their temperature distributions are narrow. These observations provide further evidence that loops in the solar corona are structured at a scale of several hundred kilometers, well above the spatial scale of proposed physical mechanisms.

Brooks, David H; Ugarte-Urra, Ignacio; Winebarger, Amy R

2013-01-01T23:59:59.000Z

262

N >= 4 Supergravity Amplitudes from Gauge Theory at Two Loops  

SciTech Connect

We present the full two-loop four-graviton amplitudes in N = 4, 5, 6 supergravity. These results were obtained using the double-copy structure of gravity, which follows from the recently conjectured color-kinematics duality in gauge theory. The two-loop four-gluon scattering amplitudes in N = 0, 1, 2 supersymmetric gauge theory are a second essential ingredient. The gravity amplitudes have the expected infrared behavior: the two-loop divergences are given in terms of the squares of the corresponding one-loop amplitudes. The finite remainders are presented in a compact form. The finite remainder for N = 8 supergravity is also presented, in a form that utilizes a pure function with a very simple symbol.

Boucher-Veronneau, C.; Dixon, L.J.; /SLAC

2012-02-15T23:59:59.000Z

263

Geometry of loop quantum gravity on a graph  

SciTech Connect

We discuss the meaning of geometrical constructions associated to loop quantum gravity states on a graph. In particular, we discuss the 'twisted geometries' and derive a simple relation between these and Regge geometries.

Rovelli, Carlo; Speziale, Simone [Centre de Physique Theorique, CNRS-Luminy Case 907, 13288 Marseille Cedex 09 (France)

2010-08-15T23:59:59.000Z

264

Oxygen Carriers for Solid Fuel Chemical Looping Combustion Process  

This patent-pending technology, “Regenerable Mixed Copper-Iron-Inert Support Oxygen Carriers for Solid Fuel Chemical Looping Combustion Process,” provides a metal-oxide oxygen carrier for application in fuel combustion processes that use oxygen.

265

Coal Direct Chemical Looping Retrofit for Pulverized Coal-Fired...  

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

Coal Direct Chemical Looping Retrofit for Pulverized Coal-Fired Power Plants with In-Situ CO 2 Capture Background Pulverized coal (PC)-fired power plants provide nearly 50% of...

266

The search for the phonological store: From loop to convolution  

Science Conference Proceedings (OSTI)

The phonological loop system of Baddeley and colleagues' Working Memory model is a major accomplishment of the modern era of cognitive psychology. It was one of the first information processing models to make an explicit attempt to accommodate both traditional ...

Bradley R. Buchsbaum; Mark D'Esposito

2008-05-01T23:59:59.000Z

267

A Numerical Study of Loop Current Intrusions and Eddy Shedding  

Science Conference Proceedings (OSTI)

The dynamics of the eddy shedding by the Loop Current in the Gulf of Mexico have been investigated using three nonlinear numerical models: two-layer, barotropic and reduced gravity. The barotropic and reduced gravity models demonstrate the ...

H. E. Hurlburt; J. Dana Thompson

1980-10-01T23:59:59.000Z

268

A Trigger Mechanism for Loop Current Ring Separations  

Science Conference Proceedings (OSTI)

The Loop Current in the Gulf of Mexico sheds large anticyclonic rings on an irregular basis. The authors attempt to show what actually triggers the ring separations. Pulses of increased transport through the Florida Straits, as observed by the ...

Wilton Sturges; Nicholas G. Hoffmann; Robert R. Leben

2010-05-01T23:59:59.000Z

269

Klystron "efficiency loop" for the ALS storage ring RF system  

E-Print Network (OSTI)

EFFICIENCY LOOP” FOR THE ALS STORAGE RING RF SYSTEM* S.at the Advanced Light Source (ALS) in order to decrease thethe cavities. 1 INTRODUCTION ALS Storage Ring RF system is

Kwiatkowski, Slawomir; Julian, Jim; Baptiste, Kenneth

2002-01-01T23:59:59.000Z

270

Investigations of tetraspanin functions using large extracellular loops  

E-Print Network (OSTI)

This thesis describes our characterization of a specific tetraspanin domain: the large extracellular loop (LEL). Tetraspanins are involved in cellular migration, adhesion, and metastasis, sperm-egg fusion, and viral ...

Liu, Christopher C

2005-01-01T23:59:59.000Z

271

Corrosion of alloy 718 in a mercury thermal convection loop  

SciTech Connect

Two thermal convection loops (TCLs) fabricated from annealed alloy 718 continuously circulated mercury (Hg) with 1000 wppm gallium (Ga), respectively, for about 5000 h, duplicating previous TCL tests for annealed 316L. In each case, the maximum loop temperature was 305C, the minimum temperature was 242C, and the Hg flow rate was approximately 1.2 m/min. Unlike the 316L exposed to Hg, which above about 260C exhibited a thin, porous surface layer depleted in Ni and Cr, the alloy 718 coupons revealed essentially no wetting and, therefore, no interaction with that Hg at any temperature. Alloy 718 coupons suspended in the loops revealed inconsequentially small weight changes, and both the coupons and loop tubing exhibited no detectable metallographic evidence of attack.

Pawel, S.J.; DiStefano, J.R.; Manneschmidt, E.T.

1999-12-01T23:59:59.000Z

272

Sodium Plugging Test Loop - Nuclear Engineering Division (Argonne)  

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

Sodium Plugging Test Loop Sodium Plugging Test Loop Sodium Plugging Test Loop Overview Other Facilities Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE on Flickr Sodium Plugging Test Loop This experimental setup is part of the Global Nuclear Energy Partnership (GNEP) Advanced Fuel Cycle R&D work carried out at Argonne on advanced sodium component technology. Bookmark and Share For long range sodium technology research and development, employing supercritical CO2 Brayton cycle power conversion technology as an advanced balance of plant technology is being considered. The component that provides the interface between the sodium and supercritical CO2 is a compact heat exchanger known as a printed circuit heat exchanger (PCHE). This heat exchanger has very small coolant flow passages that may foul or

273

Loop Current Eddy Paths in the Western Gulf of Mexico  

Science Conference Proceedings (OSTI)

The paths of anticyclonic Loop Current eddies in the western Gulf of Mexico have been investigated using ARGOS-tracked drifters accompanied by hydrographic surveys. The analysis used orbit parameters derived from a least square fit of a ...

Peter Hamilton; G. S. Fargion; D. C. Biggs

1999-06-01T23:59:59.000Z

274

Snowmass Benchmark Points and Three-Loop Running  

E-Print Network (OSTI)

We present the full three-loop beta-functions for the MSSM generalised to include additional matter multiplets in 5, 10 representations of SU(5). We analyse in detail the effect of three-loop running on the sparticle spectrum for the MSSM Snowmass Benchmark Points. We also consider the effect on these spectra of additional matter multiplets (the semi-perturbative unification scenario).

I. Jack; D. R. T. Jones; A. F. Kord

2004-08-10T23:59:59.000Z

275

On the Rational Terms of the one-loop amplitudes  

E-Print Network (OSTI)

The various sources of Rational Terms contributing to the one-loop amplitudes are critically discussed. We show that the terms originating from the generic (n-4)-dimensional structure of the numerator of the one-loop amplitude can be derived by using appropriate Feynman rules within a tree-like computation. For the terms that originate from the reduction of the 4-dimensional part of the numerator, we present two different strategies and explicit algorithms to compute them.

Giovanni Ossola; Costas G. Papadopoulos; Roberto Pittau

2008-02-13T23:59:59.000Z

276

Closing_Language_Patent_Waiver_Grant_Cases.pdf | Department of...  

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

ClosingLanguagePatentWaiverGrantCases.pdf ClosingLanguagePatentWaiverGrantCases.pdf ClosingLanguagePatentWaiverGrantCases.pdf More Documents & Publications...

277

HEATING OF FLARE LOOPS WITH OBSERVATIONALLY CONSTRAINED HEATING FUNCTIONS  

SciTech Connect

We analyze high-cadence high-resolution observations of a C3.2 flare obtained by AIA/SDO on 2010 August 1. The flare is a long-duration event with soft X-ray and EUV radiation lasting for over 4 hr. Analysis suggests that magnetic reconnection and formation of new loops continue for more than 2 hr. Furthermore, the UV 1600 Angstrom-Sign observations show that each of the individual pixels at the feet of flare loops is brightened instantaneously with a timescale of a few minutes, and decays over a much longer timescale of more than 30 minutes. We use these spatially resolved UV light curves during the rise phase to construct empirical heating functions for individual flare loops, and model heating of coronal plasmas in these loops. The total coronal radiation of these flare loops are compared with soft X-ray and EUV radiation fluxes measured by GOES and AIA. This study presents a method to observationally infer heating functions in numerous flare loops that are formed and heated sequentially by reconnection throughout the flare, and provides a very useful constraint to coronal heating models.

Qiu Jiong; Liu Wenjuan; Longcope, Dana W. [Department of Physics, Montana State University, Bozeman, MT 59717-3840 (United States)

2012-06-20T23:59:59.000Z

278

Triple loop heat exchanger for an absorption refrigeration system  

DOE Patents (OSTI)

A triple loop heat exchanger for an absorption refrigeration system is disclosed. The triple loop heat exchanger comprises portions of a strong solution line for conducting relatively hot, strong solution from a generator to a solution heat exchanger of the absorption refrigeration system, conduit means for conducting relatively cool, weak solution from the solution heat exchanger to the generator, and a bypass system for conducting strong solution from the generator around the strong solution line and around the solution heat exchanger to an absorber of the refrigeration system when strong solution builds up in the generator to an undesirable level. The strong solution line and the conduit means are in heat exchange relationship with each other in the triple loop heat exchanger so that, during normal operation of the refrigeration system, heat is exchanged between the relatively hot, strong solution flowing through the strong solution line and the relatively cool, weak solution flowing through the conduit means. Also, the strong solution line and the bypass system are in heat exchange relationship in the triple loop heat exchanger so that if the normal flow path of relatively hot, strong solution flowing from the generator to an absorber is blocked, then this relatively, hot strong solution which will then be flowing through the bypass system in the triple loop heat exchanger, is brought into heat exchange relationship with any strong solution which may have solidified in the strong solution line in the triple loop heat exchanger to thereby aid in desolidifying any such solidified strong solution.

Reimann, Robert C. (Lafayette, NY)

1984-01-01T23:59:59.000Z

279

2F and 2H evaporator loop evaluation closure report  

SciTech Connect

As a result of the Concentrate Transfer System (CTS) tank ventilation system contamination event, a task team was formed to evaluate instrument loops associated with waste reduction equipment. During the event a conductivity probe designed to provide an alarm and initiate an interlock failed to respond to the presence of liquid. An investigation revealed that the probe had become disconnected from the loop. The daily functional check of the conductivity probe circuit only tested the circuit continuity from the ventilation unit to the control room and did not actually test the probe. To test the continuity, a test switch was used to simulate the conducting probe. Because the functional check did not test each part of the loop, the test could be satisfactorily completed even though the probe itself was inoperable. The function of the task team was to develop a list of loops and interlocks prioritized by importance and likelihood of similar failure. The team evaluated the associated loop calibration and functional test procedures to verify that they are adequate to ensure loop performance on a periodic frequency. This report documents the evaluation findings and associated actions required prior to startup of the 2F and 2H evaporators.

Bates, W.F.

1994-01-28T23:59:59.000Z

280

Gosling and Fehner- Closing the Circle  

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

F. G. Gosling and Terrence R. Fehner. Closing the Cirlce: The Department of Energy and Environmental Management, 1942-1994. March 1994.Text in each PDF is fully searchable.

Note: This page contains sample records for the topic "active closed loop" 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

VISUALS: Photovoltaic Solar Cells Close-Up  

Science Conference Proceedings (OSTI)

Jan 10, 2008 ... This site contains very close-up static and portrait shots of photovoltaic solar cells and cell arrays. Two cell types are shown: A silver and gray ...

282

Direct current, closed furnace silicon technology  

Science Conference Proceedings (OSTI)

The dc closed furnace technology for smelting silicon offers technical operating challenges, as well as, economic opportunities for off-gas recovery, reduced electrode consumption, reduced reductant oxidation losses, reduced energy consumption, and improved silicon recovery. The 10 mva dc closed furnace is located in East Selkirk, Manitoba. Construction of this pilot plant was started in September 1990. Following successful commissioning of the furnace in 1992, a number of smelting tests have been conducted aimed at optimization of the furnace operation and the raw material mix. The operation of a closed furnace is significantly different from an open furnace operation. The major difference being in the mechanical movement of the mix, off-gas recovery, and inability to observe the process. These differences made data collection and analysis critical in making operating decisions. This closed furnace was operated by computer control (state of the art in the smelling industry).

Dosaj, V.D. [Dow Corning Corp., Midland, MI (United States); May, J.B. [Dow Corning Corp., Freeland, MI (United States); Arvidson, A.N. [Meadow Materials, Manitoba (Canada)

1994-05-01T23:59:59.000Z

283

The pomeron in closed bosonic string theory  

Science Conference Proceedings (OSTI)

We compute the couplings of the pomeron to the first few mass levels of closed bosonic string states in flat space. We recognize the deviation from the linearity of the Regge trajectories in a five dimensional anti De Sitter background.

Fazio, A. R. [Departamento de fisica, Universidad Nacional de Colombia, Ciudad Universitaria, Bogota D.C. (Colombia)

2010-12-22T23:59:59.000Z

284

Closed Cooling Water Chemistry Guideline: Revision 2  

Science Conference Proceedings (OSTI)

This Closed Cooling Water Chemistry Guideline addresses the use of chemicals and monitoring methods to mitigate corrosion, fouling, and microbiological growth in the closed cooling-water (CCW) systems of nuclear and fossil-fueled power plants. The chemical additives used for these purposes depend on plant-design characteristics, water quality, operating parameters, and the specifications of the Nuclear Steam Supply System (NSSS) suppliers. The list of chemicals is not as extensive as that ...

2013-12-09T23:59:59.000Z

285

Shell-models of RMHD turbulence and the heating of solar coronal loops  

E-Print Network (OSTI)

A simplified non-linear numerical model for the development of incompressible magnetohydrodynamics (MHD) in the presence of a strong magnetic field B0 and stratification, nicknamed Shell-Atm, is presented. In planes orthogonal to the mean field, the non-linear incompressible dynamics is replaced by 2D shell-models for the complex variables u and b, allowing one to reach large Reynolds numbers while at the same time carrying out sufficiently long time integrations to obtain a good statistics at moderate computational cost. The shell-models of different planes are coupled by Alfven waves propagating along B0. The model may be applied to open or closed magnetic field configurations where the axial field dominates and the plasma pressure is low; here we apply it to the specific case of a magnetic loop of the solar corona heated via turbulence driven by photospheric motions, and we use statistics for its analysis. The Alfven waves interact non-linearly and form turbulent spectra in the directions perpendicular and, via propagation, also parallel to the mean field. A heating function is obtained, and is shown to be intermittent; the average heating is consistent with values required for sustaining a hot corona, and is proportional to the aspect ratio of the loop to the power -1.5; characteristic properties of heating events are distributed as power-laws. Cross-correlations show a delay of dissipation compared to energy content.

E. Buchlin; M. Velli

2006-06-26T23:59:59.000Z

286

Design and analysis of a second order phase locked loops (PLLs)  

Science Conference Proceedings (OSTI)

This work concerns with the design and analysis of phase locked loops (PLLs). In the last decade a lot of works have been done about the analysis of PLLs. The phase locked loops are analyzed briefly, second order, third order, and fourth order. In practically ... Keywords: charge pump PLL (CPPPL), loop filter (LF), phase locked loop (PLL)

Diary R. Sulaiman

2006-05-01T23:59:59.000Z

287

Micro-Columnated Loop Heat Pipe: The Future of Electronic Substrates  

E-Print Network (OSTI)

Loop Heat Pipes . . . . . . . . . . . . . . . . . . . .Heat Pipes . . . . . . . . . . . . . . . . . . . . . . . .of operation of a heat pipe [13]. . . . . . . . . . . . . .

Dhillon, Navdeep Singh

2012-01-01T23:59:59.000Z

288

Loop Current, Rings and Related Circulation in the Gulf of Mexico: A Review of Numerical  

E-Print Network (OSTI)

3 Loop Current, Rings and Related Circulation in the Gulf of Mexico: A Review of Numerical Models of the most energetic components of the circulation in the Gulf of Mexico: the Loop Current and Loop Current the observable features of the Loop Current and rings." The Gulf of Mexico is a semi-enclosed sea that con- nects

Ezer,Tal

289

An exercise in forecasting loop current and eddy frontal positions in the Gulf of Mexico  

E-Print Network (OSTI)

An exercise in forecasting loop current and eddy frontal positions in the Gulf of Mexico L.-Y. Oey to forecast Loop Current and Loop Current eddy frontal positions in the Gulf of Mexico, the Princeton Regional (2005), An exercise in forecasting loop current and eddy frontal positions in the Gulf of Mexico

290

Synthesizing Transformations for Locality Enhancement of Imperfectly-Nested Loop Nests  

Science Conference Proceedings (OSTI)

Linear loop transformations and tiling are known to be very effective for enhancing locality of reference in perfectly-nested loops. However, they cannot be applied directly to imperfectly-nested loops. Some compilers attempt to convert imperfectly-nested ... Keywords: automatic locality enhancement, caches, imperfectly-nested loops, program transformation, restructuring compilers

Nawaaz Ahmed; Nikolay Mateev; Keshav Pingali

2001-10-01T23:59:59.000Z

291

Open loop pneumatic control of a Lysholm engine or turbine exhaust pressure  

DOE Green Energy (OSTI)

A Lysholm engine, or helical screw expander, is currently being evaluated at the University of California, Berkeley for staging with a conventional turbine in geothermal energy conversion. A pneumatic closed loop, proportional-integral control system was implemented to control the Lysholm engine's exhaust pressure for performance testing of the engine at constant inlet/outlet pressure ratios. The control system will also be used to control the exhaust pressure of the conventional turbine during future testing of the staged Lysholm-turbine system. Analytical modeling of the control system was performed and successful tuning was achieved by applying Ziegler-Nichol's tuning method. Stable control and quick response, of approximately 1 minute, was demonstrated for load and set point changes in desired exhaust pressures.

Plonski, B.A.

1981-07-17T23:59:59.000Z

292

Closed Lab Announcements | U.S. DOE Office of Science (SC)  

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

Closed Lab Announcements Closed Lab Announcements Biological and Environmental Research (BER) BER Home About Research Facilities Science Highlights Benefits of BER Funding Opportunities Closed Funding Opportunity Announcements (FOAs) Closed Lab Announcements Award Search Peer Review Policy Grants & Contracts Guidance Laboratory Scientific Focus Area Guidance SBIR/STTR Funding Opportunities Merit Review of BER Activities at the DOE Laboratories Biological & Environmental Research Advisory Committee (BERAC) News & Resources Contact Information Biological and Environmental Research U.S. Department of Energy SC-23/Germantown Building 1000 Independence Ave., SW Washington, DC 20585 P: (301) 903-3251 F: (301) 903-5051 E: sc.ber@science.doe.gov More Information » Funding Opportunities

293

NETL: Alstom's Chemical Looping Combustion Technology with CO2 Capture  

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

Alstom's Chemical Looping Combustion Technology with CO2 Capture for New and Existing Coal-Fired Power Plants Alstom's Chemical Looping Combustion Technology with CO2 Capture for New and Existing Coal-Fired Power Plants Project No.: DE-FE0009484 Alstom is advancing the development of Limestone Chemical Looping Combustion (LCL-C(tm)) technology. Chemical looping has no direct contact between air and fuel. The looping process usually utilizes oxygen from a metal carrier, but in this case, limestone is used. Economic evaluations will be made of four LCL-C plant configurations. The base configuration plant has already been completed and will be updated from previous reports. A second case will compare the effects of designing the reducer reactor using CFB sizing standards. A third case will investigate the effects of using a pressurized reducer reactor. Pressurizing the reducer reduces the reactor size and reduces the amount of compression required for the CO2 outlet gas stream. A fourth case will investigate the use of an advanced ultra-supercritical (USC) steam cycle. The advanced USC steam cycle should increase overall plant efficiency and lower the cost of electricity. Mass and energy balances will be done for each case. The four LCL-CTM cases will be compared against a supercritical pulverized coal-fired plant without CO2 capture.

294

Electroweak Constraints on the Fourth Generation at Two Loop Order  

E-Print Network (OSTI)

If the Higgs-like particle at 126 GeV is the standard model Higgs boson, then SM4, the simplest four generation extension of the SM, is inconsistent with the most recent LHC data. However, 4G variations (BSM4) are possible if the new particle is not the SM Higgs boson and/or if other new quanta modify its production and decay rates. Since LHC searches have pushed 4G quarks to high mass and strong coupling where perturbation theory eventually fails, we examine the leading nondecoupling EW (electroweak) corrections at two loop order to estimate the domain of validity for perturbation theory. We find that the two loop hypercharge correction, which has not been included in previous EW fits of 4G models, makes the largest quark sector contribution to the rho parameter, much larger even than the nominally leading one loop term. Because it is large and negative, it has a big effect on the EW fits. It does not invalidate perturbation theory since it only first appears at two loop order and is large because it does not vanish for equal quark doublet masses, unlike the one loop term. We estimate that perturbation theory is useful for $m_Q\\simeq 600$ GeV but begins to become marginal for $m_Q\\, \\gtap\\, 900$ GeV. The results apply directly to BSM4 models that retain the SM Higgs sector but must be re-evaluated for non-SM Higgs sectors.

Michael S. Chanowitz

2012-12-13T23:59:59.000Z

295

Closed sets of non-local correlations  

E-Print Network (OSTI)

We introduce a fundamental concept -- closed sets of correlations -- for studying non-local correlations. We argue that sets of correlations corresponding to information-theoretic principles, or more generally to consistent physical theories, must be closed under a natural set of operations. Hence, studying the closure of sets of correlations gives insight into which information-theoretic principles are genuinely different, and which are ultimately equivalent. This concept also has implications for understanding why quantum non-locality is limited, and for finding constraints on physical theories beyond quantum mechanics.

Jonathan Allcock; Nicolas Brunner; Noah Linden; Sandu Popescu; Paul Skrzypczyk; Tamas Vertesi

2009-08-11T23:59:59.000Z

296

Note on tachyon moduli and closed strings  

SciTech Connect

The collective behavior of the SL(2,R) covariant brane states of noncritical c=1 string theory, found in a previous work, is studied in the Fermi liquid approximation. It is found that such states mimic the coset WZW model, whereas only by further restrictions one recovers the double-scaling limit which was purported to be equivalent to closed string models. Another limit is proposed, inspired by the tachyon condensation ideas, where the spectrum is the same of two-dimensional string theory. We close by noting some strange connections between vacuum states of the theory in their different interpretations.

Carneiro da Cunha, Bruno [Helsinki Institute of Physics, P.O. Box 64, FIN-00014 University of Helsinki (Finland) and Departamento de Fisica, Universidade Federal de Pernambuco, CEP 53901-970, Recife, Pernambuco (Brazil)

2008-07-15T23:59:59.000Z

297

Quasi-Local Energy in Loop Quantum Gravity  

E-Print Network (OSTI)

Although there is no known meaningful notion of the energy density of the gravitational field in general relativity, a few notions of quasi-local energy of gravity associated to extended but finite domains have been proposed. In this paper, the notions of quasi-local energy are studied in the framework of loop quantum gravity, in order to see whether these notions can be carried out at quantum level. Two basic quasi-local geometric quantities are quantized, which lead to well-defined operators in the kinematical Hilbert space of loop quantum gravity. We then use them as basic building blocks to construct different versions of quasi-local energy operators. The operators corresponding to Brown-York energy, Liu-Yau energy, Hawking energy, and Geroch energy are obtained respectively. The virtue of the Geroch energy operator is beneficial for us to derive a rather general entropy-area relation and thus a holographic principle from loop quantum gravity.

Jinsong Yang; Yongge Ma

2008-12-18T23:59:59.000Z

298

Quasi-Local Energy in Loop Quantum Gravity  

E-Print Network (OSTI)

Although there is no known meaningful notion of the energy density of the gravitational field in general relativity, a few notions of quasi-local energy of gravity associated to extended but finite domains have been proposed. In this paper, the notions of quasi-local energy are studied in the framework of loop quantum gravity, in order to see whether these notions can be carried out at quantum level. Two basic quasi-local geometric quantities are quantized, which lead to well-defined operators in the kinematical Hilbert space of loop quantum gravity. We then use them as basic building blocks to construct different versions of quasi-local energy operators. The operators corresponding to Brown-York energy, Liu-Yau energy, Hawking energy, and Geroch energy are obtained respectively. The virtue of the Geroch energy operator is beneficial for us to derive a rather general entropy-area relation from loop quantum gravity.

Yang, Jinsong

2008-01-01T23:59:59.000Z

299

Multi-loop Feynman integrals and conformal quantum mechanics  

E-Print Network (OSTI)

New algebraic approach to analytical calculations of D-dimensional integrals for multi-loop Feynman diagrams is proposed. We show that the known analytical methods of evaluation of multi-loop Feynman integrals, such as integration by parts and star-triangle relation methods, can be drastically simplified by using this algebraic approach. To demonstrate the advantages of the algebraic method of analytical evaluation of multi-loop Feynman diagrams, we calculate ladder diagrams for the massless $\\phi^3$ theory. Using our algebraic approach we show that the problem of evaluation of special classes of Feynman diagrams reduces to the calculation of the Green functions for specific quantum mechanical problems. In particular, the integrals for ladder massless diagrams in the $\\phi^3$ scalar field theory are given by the Green function for the conformal quantum mechanics.

A. P. Isaev

2003-03-06T23:59:59.000Z

300

Print this Page Close The nuclear deal  

E-Print Network (OSTI)

that the US will adopt to the demands of Pakistan and Israel, which will also claim to be responsible nuclearPrint this Page Close The nuclear deal July 20, 2005 | 19:05 ISTT P Sreenivasan | y assuming the same responsibilities and practices as leading countries with nuclear technologies 'such as the United

Note: This page contains sample records for the topic "active closed loop" 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

Mining closed relational graphs with connectivity constraints  

Science Conference Proceedings (OSTI)

Relational graphs are widely used in modeling large scale networks such as biological networks and social networks. In this kind of graph, connectivity becomes critical in identifying highly associated groups and clusters. In this paper, we investigate ... Keywords: closed pattern, connectivity, graph

Xifeng Yan; X. Jasmine Zhou; Jiawei Han

2005-08-01T23:59:59.000Z

302

print close Mon 2 May 2005  

E-Print Network (OSTI)

nuclear fusion reactor. The two sides have been at pains to craft a compromise over competing Japaneseprint close Mon 2 May 2005 (UK)2:56am Europe and Japan at Odds over 'Superpower' Reactor "PA and French bids to host the ÂŁ6.8billion International Thermonuclear Experimental Reactor. The ITER plant

303

From Classical To Quantum Gravity: Introduction to Loop Quantum Gravity  

E-Print Network (OSTI)

We present an introduction to the canonical quantization of gravity performed in loop quantum gravity, based on lectures held at the 3rd quantum geometry and quantum gravity school in Zakopane in 2011. A special feature of this introduction is the inclusion of new proposals for coupling matter to gravity that can be used to deparametrize the theory, thus making its dynamics more tractable. The classical and quantum aspects of these new proposals are explained alongside the standard quantization of vacuum general relativity in loop quantum gravity.

Giesel, Kristina

2012-01-01T23:59:59.000Z

304

Severe accident sequences analyzed for a two-loop PWR  

Science Conference Proceedings (OSTI)

Different severe accident sequences have been analyzed for a two-loop Westinghouse pressurized water reactor (PWR) using the MELCOR code, version 1.8.4. The purpose of this study was to calculate source terms and the timing of events for severe accident sequences at this type of PWR to be used in the HAS-CAL code .The results calculated by MELCOR have been compared to results from the individual plant examination (IPE) of the Kewaunee nuclear power plant, also a two-loop Westinghouse PWR. The results of the Kewaunee IPE were obtained with the severe accident code MAAP.

Carbajo, J.J. [Oak Ridge National Lab., TN (United States)

1997-12-01T23:59:59.000Z

305

Dilaton Gravity, Poisson Sigma Models and Loop Quantum Gravity  

E-Print Network (OSTI)

Spherically symmetric gravity in Ashtekar variables coupled to Yang-Mills theory in two dimensions and its relation to dilaton gravity and Poisson sigma models are discussed. After introducing its loop quantization, quantum corrections for inverse triad components are shown to provide a consistent deformation without anomalies. The relation to Poisson sigma models provides a covariant action principle of the quantum corrected theory with effective couplings. Results are also used to provide loop quantizations of spherically symmetric models in arbitrary D space-time dimensions.

Martin Bojowald; Juan D. Reyes

2008-10-28T23:59:59.000Z

306

Gravity quantized: Loop quantum gravity with a scalar field  

Science Conference Proceedings (OSTI)

...''but we do not have quantum gravity.'' This phrase is often used when analysis of a physical problem enters the regime in which quantum gravity effects should be taken into account. In fact, there are several models of the gravitational field coupled to (scalar) fields for which the quantization procedure can be completed using loop quantum gravity techniques. The model we present in this paper consists of the gravitational field coupled to a scalar field. The result has similar structure to the loop quantum cosmology models, except that it involves all the local degrees of freedom of the gravitational field because no symmetry reduction has been performed at the classical level.

Domagala, Marcin; Kaminski, Wojciech [Instytut Fizyki Teoretycznej, Uniwersytet Warszawski, ul. Hoza 69, 00-681 Warszawa (Warsaw), Polska (Poland) (Poland); Giesel, Kristina [Excellence Cluster Universe, Technische Universitaet Muenchen, Boltzmannstrasse 2, 85748 Garching (Germany); Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803 (United States); Lewandowski, Jerzy [Instytut Fizyki Teoretycznej, Uniwersytet Warszawski, ul. Hoza 69, 00-681 Warszawa (Warsaw), Polska (Poland) (Poland); Institute for Gravitation and the Cosmos, Physics Department, Penn State, University Park, Pennsylvania 16802 (United States)

2010-11-15T23:59:59.000Z

307

Conditions for Robustness and Nonrobustness of the Stability of Feedback Systems with Respect to Small Delays in the Feedback Loop  

E-Print Network (OSTI)

It has been observed that for many stable feedback control systems, the introduction of arbitrarily small time delays into the loop causes instability. In this paper we present a systematic frequency domain treatment of this phenomenon for distributed parameter systems. We consider the class of all matrix-valued transfer functions which are bounded on some right half-plane and which have a limit at +1 along the real axis. Such transfer functions are called regular. Under the assumption that a regular transfer function is stabilized by unity output feedback, we give sufficient conditions for the robustness and for the non-robustness of the stability with respect to small time delays in the loop. These conditions are given in terms of the high frequency behavior of the open loop system. Moreover, we discuss robustness of stability with respect to small delays, for feedback systems with dynamic compensators. In particular, we show that if a plant with infinitely many poles in the closed...

Hartmut Logemann; Richard Rebarber; George Weiss

1994-01-01T23:59:59.000Z

308

DisClose: Discovering Colossal Closed Itemsets via a Memory Efficient Compact Row-Tree  

SciTech Connect

Itemset mining has recently focused on discovery of frequent itemsets from high-dimensional datasets with relatively few rows and a larger number of items. With exponentially in-creasing running time as average row length increases, mining such datasets renders most conventional algorithms impracti-cal. Unfortunately, large cardinality closed itemsets are likely to be more informative than small cardinality closed itemsets in this type of dataset. This paper proposes an approach, called DisClose, to extract large cardinality (colossal) closed itemsets from high-dimensional datasets. The approach relies on a memory-efficient Compact Row-Tree data structure to represent itemsets during the search process. The search strategy explores the transposed representation of the dataset. Large cardinality itemsets are enumerated first followed by smaller ones. In addition, we utilize a minimum cardinality threshold to further reduce the search space. Experimental result shows that DisClose can complete the extraction of colossal closed itemsets in the considered dataset, even for low support thresholds. The algorithm immediately discovers closed itemsets without needing to check if each new closed itemset has previously been found.

Zulkurnain, Nurul F.; Keane, John A.; Haglin, David J.

2013-02-01T23:59:59.000Z

309

Towards open-closed string duality: Closed Strings as Open String Fields  

E-Print Network (OSTI)

We establish a translation dictionary between open and closed strings, starting from open string field theory. Under this correspondence, (off-shell) level-matched closed string states are represented by star algebra projectors in open string field theory. Particular attention is paid to the zero mode sector, which is indispensable in order to generate closed string states with momentum. As an outcome of our identification, we show that boundary states, which in closed string theory represent D-branes, correspond to the identity string field in the open string side. It is to be remarked that closed string theory D-branes are thus given by an infinite superposition of star algebra projectors.

L. Bonora; N. Bouatta; C. Maccaferri

2006-09-26T23:59:59.000Z

310

Silica precipitation and scaling in a dynamic loop system. [Design and testing of titanium corrosion test loop  

DOE Green Energy (OSTI)

A titanium corrosion test loop was modified to provide a dynamic facility for studying the formation of silica precipitates and scale from simulated geothermal brines as a function of composition, temperature, and flow conditions. A schematic of the modified loop system is presented. The principal components and connecting piping are all constructed of commercially pure titanium. These components include a centrifugal pump, silica saturator column, segmented heat exchanger, reheat heat exchanger, and a high pressure feed pump (stainless steel). The system is designed to circulate simulated geothermal brines saturated with silica to approximately 300/sup 0/C for study of silica scaling. Data obtained from a test run are included. (JGB)

Bohlmann, E.G.; Shor, A.J.; Berlinski, P.

1977-01-01T23:59:59.000Z

311

Case Closed on Nauru Island Effect  

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

Closed on Nauru Island Effect Closed on Nauru Island Effect For original submission and image(s), see ARM Research Highlights http://www.arm.gov/science/highlights/ Research Highlight The tiny 4-kilometer-by-6-kilometer island of Nauru is isolated in the equatorial Pacific Ocean with naught but a few small scattered islands for thousands of kilometers around. Thus, the ARM measurements made there are intended to represent the larger surrounding oceanic area. But decades of phosphate mining have left large barren karst fields as the predominant land surface over most of the center of the island, making it much more susceptible to solar heating than typical tropical vegetated surfaces. During the Nauru99 campaign, small cumulus clouds were observed at times forming over the center of the island, advecting over the ARM site

312

Closed cycle cogeneration for the future  

Science Conference Proceedings (OSTI)

While present energy needs can be met with available supplies of fossil fuels, the need to plan for the eventual elimination of dependence on premium fuels in utility and industrial applications remains urgent. One of the most promising power conversion technologies for these needs is the closed cycle gas turbine (CCGT) configured for power and heat production. Closed cycle gas turbines have been in commercial use, principally in Europe, for over four decades. That experience base, combined with emerging awareness of potential CCGT applications, could lead to the operation of coal-fired CCGT cogeneration systems in the U.S. within the next decade. This paper discusses the multi-fuel capability of the CCGT and compares its performance as a flexible cogeneration system with that of a more conventional steam turbine system.

Crim, W.M.; Fraize, W.E.; Kinney, G.; Malone, G.A.

1984-06-01T23:59:59.000Z

313

Why Can Wind Delay the Shedding of Loop Current Eddies?  

Science Conference Proceedings (OSTI)

It is first shown that wind in the Gulf of Mexico can delay the shedding of Loop Current eddies. A time-dependent, three-dimensional numerical experiment forced by a spatially and temporally constant westward wind stress within the Gulf is ...

Y.-L. Chang; L.-Y. Oey

2010-11-01T23:59:59.000Z

314

Discrete gravity models and Loop Quantum Gravity: a short review  

E-Print Network (OSTI)

We review the relation between loop quantum gravity on a fixed graph and discrete models of gravity. We compare Regge and twisted geometries, and discuss discrete actions based on twisted geometries and on the discretization of the Plebanski action. We discuss the role of discrete geometries in the spin foam formalism, with particular attention to the definition of the simplicity constraints.

Dupuis, Maite; Speziale, Simone

2012-01-01T23:59:59.000Z

315

Water-Loop Heat Pump Systems: Volumes 1 and 2  

Science Conference Proceedings (OSTI)

Water-loop heat pump (WLHP) systems are reliable, versatile, energy-efficient alternatives to conventional systems such as packaged rooftop or central chiller systems. These systems offer low installed costs, unparalleled design flexibility, and an inherent ability to recover heat in a variety of commercial and multifamily residential buildings for both new construction and retrofit markets.

1993-04-01T23:59:59.000Z

316

Two-loop corrections to gluon fusion into two photons  

SciTech Connect

An overview of the calculation of the two-loop helicity amplitudes for scattering of two gluons into two photons is presented. These matrix elements enter into the recent improved calculation of the QCD background to Higgs boson decay into a pair of photons, which is the preferred search mode at the LHC for the case of a light Higgs boson.

Dixon, Lance

2002-12-20T23:59:59.000Z

317

Cerenkov's Effect and Neutrino Oscillations in Loop Quantum Gravity  

E-Print Network (OSTI)

Bounds on the scale parameter {\\cal L} arising in loop quantum gravity theory are derived in the framework of Cerenkov's effect and neutrino oscillations. Assuming that {\\cal L} is an universal constant, we infer {\\cal L}> 10^{-18}eV^{-1}, a bound compatible with ones inferred in different physical context.

G. Lambiase

2003-01-16T23:59:59.000Z

318

Loop Quantum Corrections to Statefinder Parameters of Dark Energy  

E-Print Network (OSTI)

In this short letter, we presented the explicit forms of the statefinder parameters for the Friedmann-Robertson-Walker (FRW) Universe in the loop quantum cosmology (LQC) for Holographic dark energy and New-Agegraphic dark energy. Numerically we investigated cosmological implications of these parameters for models of dark energy.

Jamil, Mubasher; Myrzakulov, Ratbay

2013-01-01T23:59:59.000Z

319

Loop Quantum Corrections to Statefinder Parameters of Dark Energy  

E-Print Network (OSTI)

In this short letter, we presented the explicit forms of the statefinder parameters for the Friedmann-Robertson-Walker (FRW) Universe in the loop quantum cosmology (LQC) for Holographic dark energy and New-Agegraphic dark energy. Numerically we investigated cosmological implications of these parameters for models of dark energy.

Mubasher Jamil; D. Momeni; Ratbay Myrzakulov

2013-05-17T23:59:59.000Z

320

A Mirnov loop array for field-reversed configurations  

SciTech Connect

An array of 64 magnetic pick-up loops has been used for stability studies of large field-reversed configurations in the FRX-C/LSM device. This array proved reliable, could resolve signals of a few Gauss, and allowed the detection of several plasma instabilities. 3 refs., 4 figs.

Tuszewski, M.

1990-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "active closed loop" 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

Micro loop heat pipe evaporator coherent pore structures  

E-Print Network (OSTI)

Loop heat pipes seem a promising approach for application in modern technologies where such thermal devices as cooling fans and radiators cannot satisfy overall requirements. Even though a loop heat pipe has a big potential to remove the thermal energy from a high heat flux source, the heat removal performance of heat pipes cannot be predicted well since a first principles of evaporation has not been established. An evaporation model based on statistical rate theory has been recently suggested by Ward and developed for a single pore by Oinuma. A loop heat pipe with coherent pore wick structure has been proposed as a design model. To limit product development risk and to enhance performance assurance, design model features and performance parameters have been carefully reviewed during the concept development phase and have been deliberately selected so as to be well-founded on the limited existing loop heat pipe knowledge base. A first principles evaporation model has been applied for evaporator geometry optimization. A number of iteration calculations have been performed to satisfy design and operating limitations. A set of recommendations for design optimization has been formulated. An optimal model has been found and proposed for manufacture and experimental investigation.

Alexseev, Alexandre Viktorovich

2003-08-01T23:59:59.000Z

322

Phase Locked Loop Control of Inverters in a Microgrid  

E-Print Network (OSTI)

Phase Locked Loop Control of Inverters in a Microgrid Matthew Surprenant Dept of ECE University Venkataramanan Dept of ECE University of Wisconsin Madison, WI, USA Abstract--Microgrids are small for inverter-based microsources within a mi- crogrid. The general control philosophy within a microgrid

Hiskens, Ian A.

323

Loop Current excursions and ring detachments during 1993–2009  

Science Conference Proceedings (OSTI)

Linkages between the variability of Loop Current LC surface dynamics, LC ring detachments, and the mean sea height anomaly in the Gulf of Mexico GOM are explored using a new methodology that locates the LC fronts and detects the shedding of LC rings. ...

David Lindo-Atichati, Francis Bringas, Gustavo Goni

2013-07-01T23:59:59.000Z

324

LOOP ROUTE UCSC CAMPUS SHUTTLES Saturday Service Hours  

E-Print Network (OSTI)

Way Social Sciences 2 ChinquapinRoad MERRILL COLLEGE McLaughlin Drive East Field House Hagar Drive, Hagar Drive, McLaughlin Drive, Heller Drive, and Empire Grade/High Street. Barn Theater Loop Science & Engineering Library Steinhart W ay Social Sciences 2 ChinquapinRoad MERRILL COLLEGE McLaughlin

California at Santa Cruz, University of

325

Energy of string loops and thermodynamics of dark energy  

Science Conference Proceedings (OSTI)

We discuss the thermodynamic aspects of a simple model of cosmic string loops, whose energy is nonlinearly related to their lengths. We obtain in a direct way an equation of state having the form p=-(1+{alpha}){rho}/3, with {rho} the energy density and 1+{alpha} the exponent which relates the energy u{sub l} of a loop with its length l as u{sub l}{approx}l{sup 1+{alpha}}. In the linear situation ({alpha}=0) one has p=-{rho}/3, in the quadratic one ({alpha}=1) p=-2{rho}/3, and in the cubic case ({alpha}=2) p=-{rho}. For all values of {alpha} the entropy goes as S{approx}(2-{alpha})L{sup 3/2} (L being the string length density). The expression of S is useful to explore the behavior of such string loops under adiabatic expansion of the Universe. Thermodynamic stability suggests that the gas of string loops must coexist with several long strings, longer than the horizon radius.

Jou, D. [Departament de Fisica, Universitat Autonoma de Barcelona, 08193 Bellaterra, Catalonia (Spain); Mongiovi, M. S.; Sciacca, M. [Dipartimento di Metodi e Modelli Matematici, Universita di Palermo, Viale delle Scienze, 90128, Palermo (Italy)

2011-02-15T23:59:59.000Z

326

Polyhedral model based mapping optimization of loop nests for CGRAs  

Science Conference Proceedings (OSTI)

The coarse-grained reconfigurable architecture (CGRA) is a promising platform that provides both high performance and high power-efficiency. The compute-intensive portions of an application (e.g. loops) are often mapped onto CGRA for acceleration. To ...

Dajiang Liu, Shouyi Yin, Leibo Liu, Shaojun Wei

2013-05-01T23:59:59.000Z

327

Quantum Mechanics and Closed Timelike Curves  

E-Print Network (OSTI)

General relativity allows solutions exhibiting closed timelike curves. Time travel generates paradoxes and quantum mechanics generalizations were proposed to solve those paradoxes. The implications of self-consistent interactions on acausal region of space-time are investigated. If the correspondence principle is true, then all generalizations of quantum mechanics on acausal manifolds are not renormalizable. Therefore quantum mechanics can only be defined on global hyperbolic manifolds and all general relativity solutions exhibiting time travel are unphysical.

Florin Moldoveanu

2007-04-23T23:59:59.000Z

328

Status Update: Closing Rocky Flats by 2006  

SciTech Connect

Safely closing Rocky Flats by December 2006 is a goal shared by many: the State of Colorado, the communities surrounding the site, the U.S. Congress, the Department of Energy (DOE), Kaiser-Hill and its team of subcontractors, the site's employees and taxpayers across the country. This paper will: provide a status of the Closure Project to date; describe important accomplishments of the past year; describe some of the closure-enhancing technologies enabling acceleration; and discuss the remaining challenges ahead.

Tuor, N.; Schubert, A.

2003-02-25T23:59:59.000Z

329

On the universality of some Smarandache loops of Bol-Moufang type  

E-Print Network (OSTI)

A Smarandache quasigroup(loop) is shown to be universal if all its f,g-principal isotopes are Smarandache f,g-principal isotopes. Also, weak Smarandache loops of Bol-Moufang type such as Smarandache: left(right) Bol, Moufang and extra loops are shown to be universal if all their f,g-principal isotopes are Smarandache f,g-principal isotopes. Conversely, it is shown that if these weak Smarandache loops of Bol-Moufang type are universal, then some autotopisms are true in the weak Smarandache sub-loops of the weak Smarandache loops of Bol-Moufang type relative to some Smarandache elements. Futhermore, a Smarandache left(right) inverse property loop in which all its f,g-principal isotopes are Smarandache f,g-principal isotopes is shown to be universal if and only if it is a Smarandache left(right) Bol loop in which all its f,g-principal isotopes are Smarandache f,g-principal isotopes. Also, it is established that a Smarandache inverse property loop in which all its f,g-principal isotopes are Smarandache f,g-principal isotopes is universal if and only if it is a Smarandache Moufang loop in which all its f,g-principal isotopes are Smarandache f,g-principal isotopes. Hence, some of the autotopisms earlier mentioned are found to be true in the Smarandache sub-loops of universal Smarandache: left(right) inverse property loops and inverse property loops.

Temitope Gbolahan Jaiyeola

2006-07-28T23:59:59.000Z

330

Orientable closed 3-manifolds with surface-complexity one  

E-Print Network (OSTI)

After a short summary of known results on surface-complexity of closed 3-manifolds, we will classify all closed orientable 3-manifolds with surface-complexity one.

Amendola, Gennaro

2010-01-01T23:59:59.000Z

331

An Analysis of Loop Current Frontal Eddies in a ° Atlantic Ocean Model Simulation  

Science Conference Proceedings (OSTI)

The Loop Current frontal eddies (LCFEs) refer to cyclonic cold eddies moving downstream along the outside edge of the Loop Current in the eastern Gulf of Mexico. They have been observed by in situ measurements and satellite imagery, mostly ...

Haosheng Huang; Nan D. Walker; Ya Hsueh; Yi Chao; Robert R. Leben

2013-09-01T23:59:59.000Z

332

An Analysis of Loop Current Frontal Eddies in a 1/6° Atlantic Ocean Model Simulation  

Science Conference Proceedings (OSTI)

The Loop Current Frontal Eddies (LCFEs) refer to cyclonic cold eddies moving downstream along the outside edge of the Loop Current in the eastern Gulf of Mexico. They have been observed by in-situ measurements and satellite imagery, mostly ...

Haosheng Huang; Nan D. Walker; Ya Hsueh; Yi Chao; Robert R. Leben

333

On the Linear Relationship between Loop Current Retreat Latitude and Eddy Separation Period  

Science Conference Proceedings (OSTI)

A linear correlation exists between the retreat latitude of the Loop Current following eddy separation and the subsequent eddy separation period. This empirical relationship was first identified in satellite altimeter-derived Loop Current ...

Alexis Lugo-Fernández; Robert R. Leben

2010-12-01T23:59:59.000Z

334

Closing Gaps in Modeling Multifamily Retrofits  

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

Building America Technical Update Meeting Denver, Colorado April 30, 2013 Jordan Dentz, The Levy Partnership., Inc. Closing Gaps in Modeling Multifamily Retrofits Advanced Residential Integrated Energy Solutions Overview * Multifamily modeling inputs (BA House Simulation Protocols) * Important multifamily measures * Other MF gaps Vital to meet 50% goals and therefore important to include in Building America's multifamily modeling capabilities Model Inputs * Heating set point * Cooling set point * Behavior assumptions 3 Heating Set Point - Central Systems * House simulation protocol assumes 71°F * Overheating is common * Approach: adjust modeled heating set point - how much? * Average heating season indoor temperature was 76°F in a sample of 18 buildings (ARIES 2013a)

335

Speckle interferometric observations of close binary stars  

E-Print Network (OSTI)

Speckle interferometric technique is employed to record a series of hundreds of short-exposure images of several close binary stars with sub-arcsecond separation through a narrow band filter at the Cassegrain focus of the 2.34 meter (m) Vainu Bappu telescope (VBT), situated at Vainu Bappu Observatory (VBO), Kavalur, India. The data are recorded sequentially by a Peltier-cooled intensified CCD camera with 10 ms exposure. The auto-correlation method is applied to determine the angular separations and position angles of these binary systems.

S. K. Saha; V. Chinnappan; L. Yeswanth; P. Anbazhagan

2002-09-20T23:59:59.000Z

336

Thermodynamic nonextensivity in a closed string gas  

E-Print Network (OSTI)

Well known results in string thermodynamics show that there is always a negative specific heat phase in the microcanonical description of a gas of closed free strings whenever there are no winding modes present. We will carefully compute the number of strings in the gas to show how this negative specific heat is related to the fact that the system does not have thermodynamic extensivity. We will also discuss the consequences for a system of having a microcanonical negative specific heat versus the exact result that such a thing cannot happen in any canonical (fixed temperature) description.

Manuel A. Cobas; M. A. R. Osorio; María Suárez

2004-06-04T23:59:59.000Z

337

Closed-field capacitive liquid level sensor  

DOE Patents (OSTI)

A liquid level sensor based on a closed field circuit comprises a ring oscillator using a symmetrical array of plate units that creates a displacement current. The displacement current varies as a function of the proximity of a liquid to the plate units. The ring oscillator circuit produces an output signal with a frequency inversely proportional to the presence of a liquid. A continuous liquid level sensing device and a two point sensing device are both proposed sensing arrangements. A second set of plates may be located inside of the probe housing relative to the sensing plate units. The second set of plates prevent any interference between the sensing plate units.

Kronberg, J.W.

1995-01-01T23:59:59.000Z

338

The HIGGS Boson Mass at 2 Loops in the Finely Tuned Split Supersymmetric Standard Model  

SciTech Connect

The mass of the Higgs boson in the finely tuned Split Supersymmetric Standard Model is calculated. All 1 loop threshold effects are included, in addition to the full RG running of the Higgs quartic coupling through 2 loops. The 2 loop corrections are very small, typically less than 1GeV. The 1 loop threshold corrections to the top yukawa coupling and the Higgs mass generally push the Higgs mass down a few GeV.

Binger, M

2004-09-08T23:59:59.000Z

339

Two Residues in the T-loop of GlnK Determine NifL-dependent Nitrogen Control of nif Gene Expression*  

E-Print Network (OSTI)

Two Residues in the T-loop of GlnK Determine NifL-dependent Nitrogen Control of nif Gene Expression NifL-mediated inhibition of NifA activity in response to the nitrogen status, and GlnB, when expressed heterologous system, in which K. pneumoniae nifLA is expressed in E. coli, to investigate the impor- tance

Merrick, Mike

340

The development of a Software and Hardware-in-the-Loop Test System for ITU-PSAT II nano satellite ADCS  

Science Conference Proceedings (OSTI)

In this work, we present the operational concept of ITU-PSAT II, the reconfigurable fault-tolerant ADCS architecture and the associated Software and Hardware-in-the-Loop Test System for three-axis active control. ADCS of ITU PSAT II consists of three ...

N. Kemal Ure; Yigit Bekir Kaya; Gokhan Inalhan

2011-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "active closed loop" 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

Brief Nonlinear stabilization of a thermal convection loop by state feedback  

Science Conference Proceedings (OSTI)

A nonlinear feedback control law that achieves global asymptotic stabilization of a 2D thermal convection loop (widely known for its ''Lorenz system'' approximation) is presented. The loop consists of viscous Newtonian fluid contained in between two ... Keywords: Backstepping, Boundary control, Convection loop

Dejan M. BošKovi?; Miroslav Krsti?

2001-12-01T23:59:59.000Z

342

Development of a Hardware-in-the-loop Simulation System for Hybrid Electric Vehicle Performance Test  

Science Conference Proceedings (OSTI)

In order to facilitate control strategy development and performance test of hybrid electric vehicle, a hardware-in-the-loop simulation system is developed. The system is constructed with LabVIEW and PXI hardware. Hardware-in-the-loop simulation test ... Keywords: hybrid electric vehicle, hardware-in-the-loop simulation, fuel economy, exhaust emission

Yanyi Zhang, Zhenhua Jin, Haoduan Wang, Qingchun Lu

2012-07-01T23:59:59.000Z

343

Ga-based passive loop optimization for magnetic field mitigation of transmission lines  

Science Conference Proceedings (OSTI)

This paper presents a systematic method to assist in the design of passive loops with the aim of mitigating the magnetic field generated by overhead transmission lines. The procedure is based on a two-dimensional (2D) modeling of the magnetic field, ... Keywords: Compensated loop, Genetic algorithm, Magnetic field, Mitigation, Passive loop, Reduction factor

Pedro Cruz; Jesús M. Riquelme; Antonio de la Villa; José L. Martínez

2007-10-01T23:59:59.000Z

344

Microsoft Word - DOE Report on OSU Looping final.doc  

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

December 2007 December 2007 DOE/NETL-2008/1307 Independent Assessment of the Potential of Chemical-Looping in the Context of a Fischer-Tropsch Plant Chemical-Looping Process in a Coal-to-Liquids Configuration Disclaimer This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name,

345

NETL: Alstom's Chemical Looping Combustion Technology with CO2 Capture  

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

Oxy-Combustion CO2 Emissions Control Oxy-Combustion CO2 Emissions Control Commercialization of the Iron Based Coal Direct Chemical Looping Process for Power Production with in situ CO2 Capture Project No.: DE-FE0009761 CDLC Process Concept CDLC Process Concept (click to enlarge) Babcock & Wilcox Power Generation Group (B&W) is developing the coal direct chemical looping (CDCL) process. The CDCL process consists of a unique moving bed reactor - the reducer - where pulverized coal is fully converted using iron-based oxygen carriers. The oxygen carrier is reduced from Fe2O3 to FeO/Fe and the flue gas is a concentrated stream of CO2 that is available for storage or beneficial use. The reduced FeO/Fe is oxidized to Fe2O3 using air in the combustor, liberating heat to produce steam for a

346

Magnetic and electric screening masses from Polyakov-loop correlations  

E-Print Network (OSTI)

Screening properties of the quark gluon plasma are studied from Polyakov-loop correlation in lattice QCD simulations with two flavors of improved Wilson quarks at temperatures $T/\\Tpc \\simeq 1$--4 where $\\Tpc$ is the pseudocritical temperature. Using the Euclidean-time reflection symmetry and the charge conjugation symmetry, we introduce various types of Polyakov-loop correlation functions and extract screening masses in magnetic and electric sectors. We find that the temperature dependence of the screening masses are well described by the weak coupling expansion. We also find that a ratio of the screening masses in the electric sector to the magnetic sector shows qualitative agreement with a prediction from the dimensionally-reduced effective field theory and the N=4 supersymmetric Yang-Mills theory at $1.3 < T/\\Tpc < 3$.

Y. Maezawa; S. Aoki; S. Ejiri; T. Hatsuda; N. Ishii; K. Kanaya; N. Ukita; T. Umeda

2008-11-04T23:59:59.000Z

347

Dynamical eigenfunctions and critical density in loop quantum cosmology  

E-Print Network (OSTI)

We offer a new, physically transparent argument for the existence of the critical, universal maximum matter density in loop quantum cosmology for the case of a flat Friedmann-Lemaitre-Robertson-Walker cosmology with scalar matter. The argument is based on the existence of a sharp exponential ultraviolet cutoff in momentum space on the eigenfunctions of the quantum cosmological dynamical evolution operator (the gravitational part of the Hamiltonian constraint), attributable to the fundamental discreteness of spatial volume in loop quantum cosmology. The existence of the cutoff is proved directly from recently found exact solutions for the eigenfunctions for this model. As a consequence, the operators corresponding to the momentum of the scalar field and the spatial volume approximately commute. The ultraviolet cutoff then implies that the scalar momentum, though not a bounded operator, is in effect bounded on subspaces of constant volume, leading to the upper bound on the expectation value of the matter densit...

Craig, David A

2012-01-01T23:59:59.000Z

348

Transmission of energy by open-loop chemical energy pipeline  

DOE Green Energy (OSTI)

The primary objective of this program is to evaluate the technical feasibility and, in a preliminary fashion, the economic viability of transmitting and storing energy by an open-loop modification of the reversible chemical energy pipeline system known as EVA/ADAM. The work designed to achieve this objective includes: (1) the preliminary design of a nuclear (HTGR) and methane-based open-loop system; (2) evaluation of energy sources as alternatives to those in the preliminary design (e.g., coal gasification and HTGR/LNG); (3) assessment of the feasibility of using existing natural gas pipelines and storage systems for the synthesis gas; (4) assessment of existing methanation technologies and interchangeability of the SNG with natural gas; (5) evaluation of the various alternative energy end-uses for heat, SNG, and electricity; and (6) development of two conceptual designs and evaluation of their economics and environmental impacts.

Baker, N R

1977-01-01T23:59:59.000Z

349

Wilson loops in string duals of walking and flavored systems  

Science Conference Proceedings (OSTI)

We consider the vacuum expectation value of Wilson loop operators by studying the behavior of string probes in solutions of type-IIB string theory generated by N{sub c} D5-branes wrapped on an S{sup 2} internal manifold. In particular, we focus on solutions to the background equations that are dual to field theories with a walking gauge coupling as well as for flavored systems. We present in detail our walking solution and emphasize various general aspects of the procedure to study Wilson loops using string duals. We discuss the special features that the strings show when probing the region associated with the walking of the field-theory coupling.

Nunez, Carlos; Piai, Maurizio; Rago, Antonio [Swansea University, School of Physical Sciences, Singleton Park, Swansea, Wales (United Kingdom)

2010-04-15T23:59:59.000Z

350

The Circadian Rhythm, A Continuous Transcription-Translation Feedback Loop,  

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

Circadian Rhythm, A Continuous Transcription-Translation Feedback Loop, Circadian Rhythm, A Continuous Transcription-Translation Feedback Loop, Contributes to Low-Dose Radiation-Induced Radioadaptive Response Aris Alexandrou University of California Davis Abstract The initiation of the circadian rhythm field occurred when the Takahashi group defined a mutation in the mouse gene “Clock” and cloned the circadian locomotor output cycles kaput (Clock) in the mid-1990’s (1-3). Currently more than a dozen clock genes have been identified (3-4). Disruptions in the circadian rhythm via changes in environmental conditions, such as, diet, temperature, and night/day hours lead to the pathogenesis of a multitude of diseases, such as, cancer, diabetes mellitus, neurological diseases, and sleep disorders. A disruption in the

351

3-d lattice SU(3) free energy to four loops  

E-Print Network (OSTI)

We report on the perturbative computation of the 3d lattice Yang-Mills free energy to four loops by means of Numerical Stochastic Perturbation Theory. The known first and second orders have been correctly reproduced; the third and fourth order coefficients are new results and the known logarithmic IR divergence in the fourth order has been correctly identified. Progress is being made in switching to the gluon mass IR regularization and the related inclusion of the Faddeev-Popov determinant.

F. Di Renzo; A. Mantovi; V. Miccio; Y. Schroder; C. Torrero

2004-09-27T23:59:59.000Z

352

THERMAL HYDRAULIC ANALYSIS OF A GAS TEST LOOP SYSTEM  

Science Conference Proceedings (OSTI)

This paper discusses thermal hydraulic calculations for a Gas Test Loop (GTL) system designed to provide a high intensity fast-flux irradiation environment for testing fuels and materials for advanced concept nuclear reactors. To assess the performance of candidate reactor fuels, these fuels must be irradiated under actual fast reactor flux conditions and operating environments, preferably in an existing irradiation facility [1]. Potential users of the GTL include the Generation IV Reactor Program, the Advanced Fuel Cycle Initiative and Space Nuclear Programs.

Donna Post Guillen; James E. Fisher

2005-11-01T23:59:59.000Z

353

Waveguide and loop coupling to fast MHD toroidal eigenmodes  

SciTech Connect

Heating of plasmas by wave techniques requires an effective method of coupling rf energy to the plasma. In cavities the presence of weakly damped eigenmodes will enhance the loading of antennas when the wave frequency equals an eigenmode frequency. This report considers two methods of coupling to fast MHD eigenmodes in a toroidal cavity: one is by a waveguide mounted perpendicular to the vacuum vessel wall; and the other by a loop placed within the cavity. (auth)

Paoloni, F.J.

1975-12-01T23:59:59.000Z

354

A Quick Derivation of the Loop Equations for Random Matrices  

E-Print Network (OSTI)

The "loop equations" of random matrix theory are a hierarchy of equations born of attempts to obtain explicit formulae for generating functions of map enumeration problems. These equations, originating in the physics of 2-dimensional quantum gravity, have lacked mathematical justification. The goal of this paper is to provide a complete and short proof, relying on a recently established complete asymptotic expansion for the random matrix theory partition function.

N. M. Ercolani; K. D. T-R McLaughlin

2006-09-18T23:59:59.000Z

355

Duality relation between radiation thermodynamics and cosmic string loop thermodynamics  

SciTech Connect

We discuss thermodynamics of electromagnetic radiation, with p=(1/3){rho} and S{proportional_to}T{sup 3}V, and of cosmic string loops, with p=-(1/3){rho} and S{proportional_to}T{sup -3}V, where p stands for pressure, T temperature, {rho} energy density, S entropy, and V volume. We write the thermodynamic formalisms under a common framework that illustrates their formal relationship and allows us to go from one to the other through a smooth transformation. From a microscopic perspective, these relations arise from the energy relations u({lambda})=hc/{lambda} for the photons of electromagnetic radiation, and u(l)=(c{sup 4}/a{sup 2}G)l for cosmic string loops, a being a numerical (dimensionless) constant and {lambda} and l the radiation wavelength and the length of a loop; G, c, and h are the gravitational constant, the speed of light in vacuo, and the Planck constant, respectively. The corresponding thermodynamic behaviors are seen to be connected through a related thermal duality corresponding to the change of T by T*=T{sub c}{sup 2}/T, with T{sub c} a reference temperature related to h, c, and G.

Jou, D. [Departament de Fisica, Universitat Autonoma de Barcelona, 08193 Bellaterra, Catalonia (Spain); Mongiovi, M. S. [Dipartimento di Metodi e Modelli Matematici, Universita di Palermo, 90128 Palermo (Italy); Sciacca, M. [Dipartimento di Sistemi Agro-Ambientali, Universita di Palermo, 90128 Palermo (Italy)

2011-05-15T23:59:59.000Z

356

Contrasting HIV phylogenetic relationships and V3 loop protein similarities  

Science Conference Proceedings (OSTI)

At least five distinct sequence subtypes of HIV-I can be identified from the major centers of the AMS pandemic. While it is too early to tell whether these subtypes are serologically or phenotypically similar or distinct in terms of properties such as pathogenicity and transmissibility, we can begin to investigate their potential for phenotypic divergence at the protein sequence level. Phylogenetic analysis of HIV DNA sequences is being widely used to examine lineages of different viral strains as they evolve and spread throughout the globe. We have identified five distinct HIV-1 subtypes (designated A-E), or clades, based on phylogenetic clustering patterns generated from genetic information from both the gag and envelope (env) genes from a spectrum of international isolates. Our initial observations concerning both HIV-1 and HIV-2 sequences indicate that conserved patterns in protein chemistry may indeed exist across distant lineages. Such patterns in V3 loop amino acid chemistry may be indicative of stable lineages or convergence within this highly variable, though functionally and immunologically critical, region. We think that there may be parallels between the apparently stable HIV-2 V3 lineage and the previously mentioned HIV-1 V3 loops which are very similar at the protein level despite being distant by cladistic analysis, and which do not possess the distinctive positively charged residues. Highly conserved V3 loop protein sequences are also encountered in SIVAGMs and CIVs (chimpanzee viral strains), which do not appear to be pathogenic in their wild-caught natural hosts.

Korber, B. [Los Alamos National Lab., NM (United States)]|[Santa Fe Inst., NM (United States); Myers, G. [Los Alamos National Lab., NM (United States)

1992-12-31T23:59:59.000Z

357

Contrasting HIV phylogenetic relationships and V3 loop protein similarities  

Science Conference Proceedings (OSTI)

At least five distinct sequence subtypes of HIV-I can be identified from the major centers of the AMS pandemic. While it is too early to tell whether these subtypes are serologically or phenotypically similar or distinct in terms of properties such as pathogenicity and transmissibility, we can begin to investigate their potential for phenotypic divergence at the protein sequence level. Phylogenetic analysis of HIV DNA sequences is being widely used to examine lineages of different viral strains as they evolve and spread throughout the globe. We have identified five distinct HIV-1 subtypes (designated A-E), or clades, based on phylogenetic clustering patterns generated from genetic information from both the gag and envelope (env) genes from a spectrum of international isolates. Our initial observations concerning both HIV-1 and HIV-2 sequences indicate that conserved patterns in protein chemistry may indeed exist across distant lineages. Such patterns in V3 loop amino acid chemistry may be indicative of stable lineages or convergence within this highly variable, though functionally and immunologically critical, region. We think that there may be parallels between the apparently stable HIV-2 V3 lineage and the previously mentioned HIV-1 V3 loops which are very similar at the protein level despite being distant by cladistic analysis, and which do not possess the distinctive positively charged residues. Highly conserved V3 loop protein sequences are also encountered in SIVAGMs and CIVs (chimpanzee viral strains), which do not appear to be pathogenic in their wild-caught natural hosts.

Korber, B. (Los Alamos National Lab., NM (United States) Santa Fe Inst., NM (United States)); Myers, G. (Los Alamos National Lab., NM (United States))

1992-01-01T23:59:59.000Z

358

Integrating desulfurization with CO{sub 2}-capture in chemical-looping combustion  

Science Conference Proceedings (OSTI)

Chemical looping combustion (CLC) is an emerging technology for clean combustion. We have previously demonstrated that the embedding of metal nanoparticles into a nanostructured ceramic matrix can result in unusually active and sinter-resistant nanocomposite oxygen carrier materials for CLC which maintain high reactivity and high-temperature stability even when sulfur contaminated fuels are used in CLC. Here, we propose a novel process scheme for in situ desulfurization of syngas with simultaneous CO{sub 2}-capture in chemical looping combustion by using these robust nanocomposite oxygen carriers simultaneously as sulfur-capture materials. We found that a nanocomposite Cu-BHA carrier can indeed strongly reduce the H{sub 2}S concentration in the fuel reactor effluent. However, during the process the support matrix is also sulfidized and takes part in the redox process of CLC. This results in SO{sub 2} production during the reduction of the oxygen carrier and thus limits the degree of desulfurization attainable with this kind of carrier. Nevertheless, the results suggest that simultaneous desulfurization and CO{sub 2} capture in CLC is feasible with Cu as oxygen carrier as long as appropriate carrier support materials are chosen, and could result in a novel, strongly intensified process for low-emission, high efficiency combustion of sulfur contaminated fuel streams.

Solunke, Rahul; Veser, Goetz

2011-02-01T23:59:59.000Z

359

Control Loop Tuning and Surge Response for Hanford WTP Melter Offgas Systems  

SciTech Connect

This report describes control loop tuning in models of the high level waste (HLW) melter offgas system, the low activity waste (LAW) melter offgas system and the HLW Pulse Jet Ventilation system and an assessment of the response to steam surges in both melter offgas systems. The three offgas systems were modeled using the Aspen Custom Modeler (ACM) software. The ACM models have been recently updated. Flowsheets of the system models used in this study are provided in Appendix D. To facilitate testing, these flowsheets represent somewhat simplified versions of the full models. For example, the HLW and LAW vessel ventilation systems have been represented as fixed air sources that provide a constant gas flow and specified air surges. Similarly, the six tanks and individual pulse-jet air sources in the HLW Pulse Jet Ventilation system are represented as a constant air source for control loop tuning purposes. The second LAW melter system has also been represented as a constant flow air source and several other simplifications such as removing HLW and LAW control interlocks, submerged bed scrubber bypass lines, and pressure relief valves have been made.

SMITH, FG III

2004-06-14T23:59:59.000Z

360

Transportation implications of a closed fuel cycle.  

Science Conference Proceedings (OSTI)

Transportation for each step of a closed fuel cycle is analyzed in consideration of the availability of appropriate transportation infrastructure. The United States has both experience and certified casks for transportation that may be required by this cycle, except for the transport of fresh and used MOX fuel and fresh and used Advanced Burner Reactor (ABR) fuel. Packaging that had been used for other fuel with somewhat similar characteristics may be appropriate for these fuels, but would be inefficient. Therefore, the required neutron and gamma shielding, heat dissipation, and criticality were calculated for MOX and ABR fresh and spent fuel. Criticality would not be an issue, but the packaging design would need to balance neutron shielding and regulatory heat dissipation requirements.

Bullard, Tim (University of Nevada - Reno); Bays, Samuel (Idaho National Laboratory); Dennis, Matthew L.; Weiner, Ruth F.; Sorenson, Ken Bryce; Dixon, Brent (Idaho National Laboratory); Greiner, Miles (University of Nevada - Reno)

2010-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "active closed loop" from the National Library of EnergyBeta (NLEBeta).
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361

Thermal vacancies in close-packing solids  

E-Print Network (OSTI)

Based on Stillinger's version of cell cluster theory, we derive an expression for the equilibrium concentration of thermal monovacancies in solids which allows for a transparent interpretation of the vacancy volume and the energetic/entropic part in the corresponding Gibbs energy of vacancy formation $\\Delta G_{\\rm v}$. For the close--packing crystals of the hard sphere and Lennard--Jones model systems very good agreement with simulation data is found. Application to metals through the embedded--atom method (EAM) reveals a strong sensitivity of the variation of $\\Delta G_{\\rm v}$ with temperature to details of the EAM potential. Our truncation of the cell cluster series allows for an approximate, but direct measurement of crystal free energies and vacancy concentration in colloidal model systems using laser tweezers.

Mostafa Mortazavifar; Martin Oettel

2013-11-20T23:59:59.000Z

362

The temporal evolution of coronal loops observed by GOES-SXI  

E-Print Network (OSTI)

We study the temporal evolution of coronal loops using data from the Solar X-ray Imager (SXI) on board of GOES-12. This instrument allows us to follow in detail the full lifetime of coronal loops. The observed light curves suggest three somewhat distinct evolutionary phases: rise, main, and decay. The durations and characteristic timescales of these phases are much longer than a cooling time and indicate that the loop-averaged heating rate increases slowly, reaches a maintenance level, and then decreases slowly. This suggests that a single heating mechanism operates for the entire lifetime of the loop. For monolithic loops, the loop-averaged heating rate is the intrinsic energy release rate of the heating mechanism. For loops that are bundles of impulsively heated strands, it is an indication of the frequency of occurrence of individual heating events, or nanoflares. We show that the timescale of the loop-averaged heating rate is proportional to the timescale of the observed intensity variation. The ratios of the radiative to conductive cooling times in the loops are somewhat less than 1, putting them intermediate between the values measured previously for hotter and cooler loops. Our results provide further support for the existence of a trend suggesting that all loops are heated by the same mechanism, or that different mechanisms have fundamental similarities (e.g., are all impulsive or are all steady with similar rates of heating).

M. C. Lopez Fuentes; J. A. Klimchuk; C. H. Mandrini

2006-11-10T23:59:59.000Z

363

Author manuscript, published in "The Sixth International Conference on Wireless On-demand Network Systems and Services (2009)" DOI: 10.1109/WONS.2009.4801855 Loop Avoidance for Fish-Eye OLSR in Sparse Wireless Mesh Networks  

E-Print Network (OSTI)

Abstract — The use of Fish eye scoping has been introduced to reduce the overhead of the OLSR routing protocol. This simple method is based on reducing the scope (TTL) of some topology updates, thus giving routers a precise view of their close neighborhood and a more and more approximate view of farther nodes. Fish Eye OLSR (OFLSR) has been showed to have excellent scaling properties and low network overhead. However, if deployed in relatively sparse networks, this scoping limitation of topology updates can result in long living routing loops, thus limiting the potential applications of such mechanisms in some practical wireless mesh networks. In this paper, we address the transient mini-loop problem due to fisheye scoping. We first analyze the occurrence of mini-loops. We discuss potential solutions and propose a pragmatic and distributed off-line heuristic, which allows each router to

Yasir Faheem

2010-01-01T23:59:59.000Z

364

MHK Technologies/Closed Cycle OTEC | Open Energy Information  

Open Energy Info (EERE)

Closed Cycle OTEC Closed Cycle OTEC < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Closed Cycle OTEC.jpg Technology Profile Primary Organization Marine Development Associates Inc Technology Resource Click here OTEC Technology Type Click here OTEC - Closed Cycle Technology Description Closed Cycle System Technology Dimensions Device Testing Date Submitted 02:50.8 << Return to the MHK database homepage Retrieved from "http://en.openei.org/w/index.php?title=MHK_Technologies/Closed_Cycle_OTEC&oldid=681555" Category: Marine and Hydrokinetic Technologies What links here Related changes Special pages Printable version Permanent link Browse properties 429 Throttled (bot load) Error 429 Throttled (bot load) Throttled (bot load)

365

String operations in orientable open-closed string topology  

E-Print Network (OSTI)

To open-closed cobordism surfaces labeled by closed orientable submanifolds, orientable open-closed string topology associates (degree zero) string operations determined up to sign, which depend only on homeomorphism types of surfaces and which satisfy sewing property. In orientable open-closed string topology, we show that most string operations vanish. We describe those open-closed cobordisms with vanishing string operations, and give a short list of open-closed cobordisms with possibly nontrivial string operations. To prove the above vanishing results, we give a systematic discussion of properties of transfer maps.

Tamanoi, Hirotaka

2008-01-01T23:59:59.000Z

366

Closed-cycle gas turbine chemical processor  

SciTech Connect

A closed-cycle gas turbine chemical processor separates the functions of combustion air and dilution fluid in a gas turbine combustor. The output of the turbine stage of the gas turbine is cooled and recirculated to its compressor from where a proportion is fed to a dilution portion of its combustor and the remainder is fed to a chemical recovery system wherein at least carbon dioxide is recovered therefrom. Fuel and combustion air are fed to a combustion portion of the gas turbine combustor. In a preferred embodiment of the invention, the gas turbine is employed to drive an electric generator. A heat recovery steam generator and a steam turbine may be provided to recover additional energy from the gas turbine exhaust. The steam turbine may be employed to also drive the electric generator. additional heat may be added to the heat recovery steam generator for enhancing the electricity generated using heat recovery combustors in which the functions of combustion and dilution are separated. The chemical recovery system may employ process steam tapped from an intermediate stage of the steam turbine for stripping carbon dioxide from an absorbent liquid medium which is used to separate it from the gas stream fed to it. As the amount of carbon dioxide in the fuel fed to the chemical processor increases, the amount of process steam required to separate it from the absorbent fluid medium increases and the contribution to generated electricity by the steam turbine correspondingly decreases.

Stahl, C. R.

1985-07-16T23:59:59.000Z

367

A Closely-Spaced Magnetotelluric Study Of The Ahuachapan-Chipilapa  

Open Energy Info (EERE)

Closely-Spaced Magnetotelluric Study Of The Ahuachapan-Chipilapa Closely-Spaced Magnetotelluric Study Of The Ahuachapan-Chipilapa Geothermal Field, El Salvador Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: A Closely-Spaced Magnetotelluric Study Of The Ahuachapan-Chipilapa Geothermal Field, El Salvador Details Activities (0) Areas (0) Regions (0) Abstract: The distribution of electrical conductivity beneath the Ahuachapan-Chipilapa geothermal area was simulated using 2-D models based on 126 closely-spaced magnetotelluric (MT) measurements. The observed MT response was interpreted as being produced by the superposition of two orthogonal geological structural systems: an approximately E-W regional trend associated with the Central Graben structure, which affects the longer period response, and a local and younger N-S fault system that is

368

Performance of a Treatment Loop for Recycling Spent Rinse Waters  

Science Conference Proceedings (OSTI)

This paper summarizes an evaluation of a treatment loop designed to upgrade the quality of spent rinse waters discharged from 10 wet benches located in the fab at Sandia's Microelectronics Development Laboratory (MDL). The goal of the treatment loop is to make these waters, presently being discharged to the fab's acid waste neutralization (AWN) station, suitable for recycling as feed water back into the fab's ultrapure water (UPW) plant. The MDL typically operates 2 shifts per day, 5 days per week. Without any treatment, the properties of the spent rinse waters now being collected have been shown to be compatible with recycling about 30% (50/168) of the time (weekends primarily, when the fab is idling) which corresponds to about 12% of the present water discharged from the fab to the AWN. The primary goal of adding a treatment loop is to increase the percentage of recyclable water from these 10 wet benches to near 100%, increasing the percentage of total recyclable water to near 40% of the total present fab discharge to the AWN. A second goal is to demonstrate compatibility with recycling this treated spent rinse water to the present R/O product water tank, reducing both the present volume of R/O reject water and the present load on the R/O. The approach taken to demonstrate achieving these goals is to compare all the common metrics of water quality for the treated spent rinse waters with those of the present R/O product water. Showing that the treated rinse water is equal or superior in quality to the water presently stored in the R/O tank by every metric all the time is assumed to be sufficient argument for proceeding with plans to incorporate recycling of these spent rinse waters back into MDL's R/O tank.

DONOVAN,ROBERT PATRICK; TIMON,ROBERT P.; DEBUSK,MICHAEL JOHN; JONES,RONALD V.; ROGERS,DARELL M.

2000-11-15T23:59:59.000Z

369

DOE/NETL ADVANCED COMBUSTION SYSTEMS: CHEMICAL LOOPING SUMMARY  

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

COMBUSTION SYSTEMS: CHEMICAL LOOPING SUMMARY JULY 2013 DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal li- ability or responsibility for the accuracy, completeness, or useful- ness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommenda-

370

Geothermal Loop Experimental Facility. Quarterly report, January-March, 1979  

DOE Green Energy (OSTI)

The general operations and accomplishments of the Geothermal Loop Experimental Facility during the period from January 1, 1979 through March 31, 1979 are summarized. The construction and installation of a reactor clarifier/media filter system to treat the effluent brine continued. Startup is expected during the next reporting period. Operations of the facility evaluated the two stage flash cycle characteristics of brines from the second production well (Woolsey No. 1). The results were similar to the characteristics of the first production well (Magmamax No. 1) that were reported previously. The 1979 test program has been initiated and preliminary results documented.

Anastas, G.; Bischoff, W.S.; Bishop, H.K.

1979-04-01T23:59:59.000Z

371

One Loop Effects in Various Dimensions and D-Branes  

E-Print Network (OSTI)

We calculate some one loop corrections to the effective action of theories in $d$ dimensions that arise on the dimensional reduction of a Weyl fermion in $D$ dimensions. The terms that we are interested in are of a topological nature. Special attention is given to the effective actions of the super Yang Mills theories that arise on dimensional reduction of the N=1 theory in six dimensions or on the dimensional reduction of the N=1 theory in ten dimensions. In the latter case we suggest an interpretation of the quantum effect as a coupling of the gauge field on the brane to a relative background gauge field.

Chaouki Boulahouache; George Thompson

1998-01-13T23:59:59.000Z

372

Open-loop Band excitation Kelvin Probe Force Microscopy  

Science Conference Proceedings (OSTI)

A multidimensional scanning probe microscopy approach for quantitative, cross-talk free mapping of surface electrostatic properties is demonstrated. Open-loop band excitation Kelvin probe force microscopy (OL BE KPFM) probes the full response-frequency-potential surface at each pixel at standard imaging rates. The subsequent analysis reconstructs work function, tip surface capacitance gradient and resonant frequency maps, obviating feedback-related artifacts. OL BE KPFM imaging is demonstrated for several materials systems with topographic, potential and combined contrast. This approach combines the features of both frequency and amplitude KPFM and allows complete decoupling of topographic and voltage contributions to the KPFM signal.

Guo, Senli [ORNL; Kalinin, Sergei V [ORNL; Jesse, Stephen [ORNL

2012-01-01T23:59:59.000Z

373

Loop Quantum Theory Applied to Biology and Nonlinear Whole Biology  

E-Print Network (OSTI)

The loop quantum theory, which constitutes a very small discontinuous space, as new method is applied to biology. The model of protein folding and lungs is proposed. In the model, some known results are used, and four approximate conclusions are obtained: their structures are quantized, their space regions are finite, various singularities correspond to folding and crossed points, and different types of catastrophe exist. Further, based on the inseparability and correlativity of the biological systems, the nonlinear whole biology is proposed, and four basic hypotheses are formed. It may unify reductionism and holism, structuralism and functionalism. Finally, the medical meaning of the theory is discussed briefly.

Yi-Fang Chang

2008-01-02T23:59:59.000Z

374

System having unmodulated flux locked loop for measuring magnetic fields  

DOE Patents (OSTI)

A system (10) for measuring magnetic fields, wherein the system (10) comprises an unmodulated or direct-feedback flux locked loop (12) connected by first and second unbalanced RF coaxial transmission lines (16a, 16b) to a superconducting quantum interference device (14). The FLL (12) operates for the most part in a room-temperature or non-cryogenic environment, while the SQUID (14) operates in a cryogenic environment, with the first and second lines (16a, 16b) extending between these two operating environments.

Ganther, Jr., Kenneth R. (Olathe, KS); Snapp, Lowell D. (Blue Springs, MO)

2006-08-15T23:59:59.000Z

375

Closed BLM Public Lands: Geothermal Leases Not Permitted The...  

Open Energy Info (EERE)

Closed BLM Public Lands: Geothermal Leases Not Permitted The U.S. Bureau of Land Management (BLM) released a series of GIS layers of public lands closed to geothermal leases...

376

PARS II Process Document - DOE Period Close | Department of Energy  

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

DOE Period Close PARS II Process Document - DOE Period Close This document details the process adopted by the Office of Acquisition and Project Management to prepare APM DepSec...

377

Automated electricity demand response - Tech Close-Up  

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

Automated electricity demand response - Tech Close-Up Click here to view this video Date: August 27, 2013 Presenter(s): Many, including EETD's Mary Ann Piette. A Tech Close-Up news...

378

NETL: Coal & Coal Biomass to Liquids - Closely Aligned Programs  

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

Home > Technologies > C&CBTL > Closely Aligned Programs Coal and CoalBiomass to Liquids Closely Aligned Programs The Department of Energy's (DOE) Coal & CoalBiomass to Liquids...

379

Microsoft Word - PARS II Process Document - Close Period 2013...  

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

PARS II APM DepSec Monthly Report & Close Period, V-2013-04-29 Page 1 PARS II Process Document APM DEPSEC MONTHLY REPORT & CLOSE PERIOD PURPOSE The purpose of this document is to...

380

Epigenetic modifications and chromatin loop organization explain the different expression profiles of the Tbrg4, WAP and Ramp3 genes  

Science Conference Proceedings (OSTI)

Whey Acidic Protein (WAP) gene expression is specific to the mammary gland and regulated by lactogenic hormones to peak during lactation. It differs markedly from the more constitutive expression of the two flanking genes, Ramp3 and Tbrg4. Our results show that the tight regulation of WAP gene expression parallels variations in the chromatin structure and DNA methylation profile throughout the Ramp3-WAP-Tbrg4 locus. Three Matrix Attachment Regions (MAR) have been predicted in this locus. Two of them are located between regions exhibiting open and closed chromatin structures in the liver. The third, located around the transcription start site of the Tbrg4 gene, interacts with topoisomerase II in HC11 mouse mammary cells, and in these cells anchors the chromatin loop to the nuclear matrix. Furthermore, if lactogenic hormones are present in these cells, the chromatin loop surrounding the WAP gene is more tightly attached to the nuclear structure, as observed after a high salt treatment of the nuclei and the formation of nuclear halos. Taken together, our results point to a combination of several epigenetic events that may explain the differential expression pattern of the WAP locus in relation to tissue and developmental stages.

Montazer-Torbati, Mohammad Bagher; Hue-Beauvais, Cathy; Droineau, Stephanie; Ballester, Maria; Coant, Nicolas; Aujean, Etienne; Petitbarat, Marie [UR1196, Unite de Genomique et Physiologie de la Lactation, INRA, F-78 352 Jouy en josas (France); Rijnkels, Monique [Children's Nutrition Research Center (CNRC)-Baylor College of Medicine, 1100 Bates Street, Houston TX (United States); Devinoy, Eve [UR1196, Unite de Genomique et Physiologie de la Lactation, INRA, F-78 352 Jouy en josas (France)], E-mail: eve.devinoy@jouy.inra.fr

2008-03-10T23:59:59.000Z

Note: This page contains sample records for the topic "active closed loop" 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

Initial findings: The integration of water loop heat pump and building structural thermal storage systems  

SciTech Connect

This report is one in a series of reports describing research activities in support of the US Department of Energy (DOE) Commercial Building System Integration Research Program. The goal of the program is to develop the scientific and technical basis for improving integrated decision-making during design and construction. Improved decision-making could significantly reduce buildings' energy use by the year 2010. The objectives of the Commercial Building System Integration Research Program are: to identify and quantify the most significant energy-related interactions among building subsystems; to develop the scientific and technical basis for improving energy related interactions in building subsystems; and to provide guidance to designers, owners, and builders for improving the integration of building subsystems for energy efficiency. The lead laboratory for this program is the Pacific Northwest Laboratory. A wide variety of expertise and resources from industry, academia, other government entities, and other DOE laboratories are used in planning, reviewing and conducting research activities. Cooperative and complementary research, development, and technology transfer activities with other interested organizations are actively pursued. In this report, the interactions of a water loop heat pump system and building structural mass and their effect on whole-building energy performance is analyzed. 10 refs., 54 figs., 1 tab.

Marseille, T.J.; Johnson, B.K.; Wallin, R.P.; Chiu, S.A.; Crawley, D.B.

1989-01-01T23:59:59.000Z

382

Open-Closed String Correspondence in Open String Field Theory  

E-Print Network (OSTI)

We address the problem of describing different closed string backgrounds in background independent open string field theory: A shift in the closed string background corresponds to a collective excitation of open strings. As an illustration we apply the formalism to the case where the closed string background is a group manifold.

Baumgartl, Marco

2008-01-01T23:59:59.000Z

383

Testing Loop Quantum Gravity and Electromagnetic Dark Energy in Superconductors  

E-Print Network (OSTI)

In 1989 Cabrera and Tate reported an anomalous excess of mass of the Cooper pairs in rotating thin Niobium rings. So far, this experimental result never received a proper theoretical explanation in the context of superconductor's physics. In the present work we argue that what Cabrera and Tate interpreted as an anomalous excess of mass can also be associated with a deviation from the classical gravitomagnetic Larmor theorem due to the presence of dark energy in the superconductor, as well as with the discrete structure of the area of the superconducting Niobium ring as predicted by Loop Quantum Gravity. From Cabrera and Tate measurements we deduce that the quantization of spacetime in superconducting circular rings occurs at the Planck-Einstein scale $l_{PE} = (\\hbar G/c^3 \\Lambda)^{1/4}\\sim 3.77\\times 10 ^{-5} m$, instead of the Planck scale $l_{P} =(\\hbar G / c^3)^{1/2}=1.61 \\times 10 ^{-35} m$, with an Immirzi parameter which depends on the specific critical temperature of the superconducting material and on the area of the ring. The stephan-Boltzmann law for quantized areas delimited by superconducting rings is predicted, and an experimental concept based on the electromagnetic black-body radiation emitted by this surfaces, is proposed to test loop quantum gravity and electromagnetic dark energy in superconductors.

Clovis Jacinto de Matos

2008-12-30T23:59:59.000Z

384

Two-Loop Bethe Logarithms for Higher Excited S Levels  

E-Print Network (OSTI)

Processes mediated by two virtual low-energy photons contribute quite significantly to the energy of hydrogenic S states. The corresponding level shift is of the order of (alpha/pi)^2 (Zalpha)^6 m_e c^2 and may be ascribed to a two-loop generalization of the Bethe logarithm. For 1S and 2S states, the correction has recently been evaluated by Pachucki and Jentschura [Phys. Rev. Lett. vol. 91, 113005 (2003)]. Here, we generalize the approach to higher excited S states, which in contrast to the 1S and 2S states can decay to P states via the electric-dipole (E1) channel. The more complex structure of the excited-state wave functions and the necessity to subtract P-state poles lead to additional calculational problems. In addition to the calculation of the excited-state two-loop energy shift, we investigate the ambiguity in the energy level definition due to squared decay rates.

Ulrich D. Jentschura

2004-09-23T23:59:59.000Z

385

A New Multilevel Method for Electrostatic Problems through Hierarchical Loop Basis  

E-Print Network (OSTI)

We present a new multilevel method for calculating Poisson's equation, which often arises form electrostatic problems, by using hierarchical loop bases. This method, termed hierarchical Loop basis Poisson Solver (hieLPS), extends previous Poisson solver through loop-tree basis to a multilevel mesh. In this method, Poisson's equation is solved by a two-step procedure: First, the electric flux is found by using loop-tree basis based on Helmholtz decomposition of field; Second, the potential distribution is solved rapidly with a fast solution of O(N) complexity. Among the solution procedures, finding the loop part of electric flux is the most critical part and dominates the computational effort. To expedite this part's convergent speed, we propose to use hierarchical loop bases to construct a multilevel system. As a result, the whole solution time has been noticeably reduced. Numerical examples are presented to demonstrate the efficiency of the proposed method.

Z. -H. Ma; W. C. Chew; Y. M. Wu; L. J. Jiang

2013-05-14T23:59:59.000Z

386

Advanced Control Technology Update: Multi-Loop Tuning and Model Predictive Control  

Science Conference Proceedings (OSTI)

This technical update provides information on two projects in the advanced control area. The first project is a study of control system tuning methods for multiple interacting proportional-integral-derivative PID control loops. The traditional method for tuning such systems, common on power plant boiler control systems, is to tune each loop in a specified sequence. An alternative method, in which all loops are tuned simultaneously, is being developed in this study and will be compared to the traditional ...

2008-03-30T23:59:59.000Z

387

Integrated Vehicle Thermal Management - Combining Fluid Loops in Electric Drive Vehicles (Presentation)  

SciTech Connect

Plug-in hybrid electric vehicles and electric vehicles have increased vehicle thermal management complexity, using separate coolant loop for advanced power electronics and electric motors. Additional thermal components result in higher costs. Multiple cooling loops lead to reduced range due to increased weight. Energy is required to meet thermal requirements. This presentation for the 2013 Annual Merit Review discusses integrated vehicle thermal management by combining fluid loops in electric drive vehicles.

Rugh, J. P.

2013-07-01T23:59:59.000Z

388

Engineering activities at the MIT research reactor in support of power reactor technology  

SciTech Connect

The Massachusetts Institute of Technology (MIT) research reactor (MITR-II) is a 5-MW(thermal) light-water-cooled and-moderated reactor (LWR) with in-core neutron and gamma dose rates that closely approximate those in current LWRs. Compact in-pile loops that simulate pressurized water reactor (PWR) and boiling water reactor (BWR) thermal hydraulics and coolant chemistry have been designed for installation in the MITR-II. A PWR loop has been completed and is currently operating in the reactor. A BWR loop is under construction, and an in-pile facility for irradiation-assisted stress corrosion crack (IASCC) testing is being designed. Another major area of research and on-line testing is the closed-loop, nonlinear, digital control of various reactor parameters, including the power level, temperature, and net energy production.

Harling, O.K.; Bernard, J.A.; Driscoll, M.J.; Kohse, G.E.; Ballinger, R.G.

1989-01-01T23:59:59.000Z

389

Forward thinking in reverse : design, implementation, and continuous monitoring of a closed-loop supply chain using optimization, simulation, and dashboard systems to maximize net recovery  

E-Print Network (OSTI)

Developed during our recent six-month engagement at Dell-a leading computer manufacturer and services provider with one of the world's leading supply chains--we discuss a network flow-based mixed-integer linear program ...

Vasil, Timothy J. (Timothy James)

2011-01-01T23:59:59.000Z

390

Scaling of Hybrid Electric Vehicle Powertrain Components for Hardware-in-the-Loop Simulation.  

E-Print Network (OSTI)

??Hardware in the loop (HIL) simulation enables experimental study of prototype hardware systems or control algorithms via real-time interaction between physical hardware and virtual simulations.… (more)

Petersheim, Michael

2008-01-01T23:59:59.000Z

391

Conceptual Design for a High-Temperature Gas Loop Test Facility  

SciTech Connect

This report documents an early-stage conceptual design for a high-temperature gas test loop. The objectives accomplished by the study include, (1) investigation of existing gas test loops to determine ther capabilities and how the proposed system might best complement them, (2) development of a preliminary test plan to help identify the performance characteristics required of the test unit, (3) development of test loop requirements, (4) development of a conceptual design including process flow sheet, mechanical layout, and equipment specifications and costs, and (5) development of a preliminary test loop safety plan.

James B. Kesseli

2006-08-01T23:59:59.000Z

392

OPTIMIZED CONTROL STRATEGIES FOR A TYPICAL WATER LOOP HEAT PUMP SYSTEM.  

E-Print Network (OSTI)

??Water Loop Heat Pump (WLHP) System has been widely utilized in the Heating, Ventilating and Air Conditioning (HVAC) industry for several decades. There is no… (more)

Lian, Xu

2011-01-01T23:59:59.000Z

393

A steady state analysis code for prediction of behavior in loop heat pipes.  

E-Print Network (OSTI)

??The purpose of this work is to prepare an analysis raphics. code for the prediction of Loop Heat Pipe (LHP) behavior in steady-state operation. The… (more)

Hamm, Trenton Allen

2012-01-01T23:59:59.000Z

394

Three loop MSbar transversity operator anomalous dimensions for fixed moment n <= 8  

E-Print Network (OSTI)

We compute the anomalous dimensions of the transversity operator at three loops in the MSbar scheme for fixed moment n where n n <= 7.

J. A. Gracey

2006-11-07T23:59:59.000Z

395

Who pays to close a nuke  

Science Conference Proceedings (OSTI)

Treating nuclear power plant decommissioning as an externality helps reduce the costs of the decisions we will be forced to make soon. According to the British magazine Atom, more than 60 nuclear power plants will be candidates for decommissioning worldwide by 2000. Another 350 commercial reactors worldwide will become eligible for decommissioning two decades after that. The United States has about one-quarter of the world's commercial reactors, many of which are nearing the end of their licensed life. While various organizations and government agencies debate the future direction of nuclear power in the United States, reactor retirements already are starting to accumulate. Vermont Yankee, Yankee Rowe, Indian Point 1, Dresden 1, LaCrosse, Peach Bottom 1, Ft. St. Vrain, Three Mile Island 2, Rancho Seco, and Humboldt Bay 3 all have been announced for decommissioning. Shippingport Atomic Station, near Pittsburgh, has been dismantled and removed. Many questions are emerging as the specter of abandoned hulks and mountains of radioactive debris begins to loom on the horizon. A useful way to address some of the problems of nuclear decommissioning is through the work of University of Chicago Professor Ronald Coase. Coase received the Nobel Prize in economics in October 1991 primarily for his work on externalities; that is, the by-products of production or consumption activities that affect others besides the producer or consumer.

Pasqualetti, M.J.; Rothwell, G.

1993-01-15T23:59:59.000Z

396

Hybrid Combustion-Gasification Chemical Looping Coal Power Technology Development  

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

Gasification Gasification Technologies contacts Gary J. stiegel Gasification Technology Manager National Energy Technology Laboratory 626 Cochrans Mill Road P.O. Box 10940 Pittsburgh, PA 15236 412-386-4499 gary.stiegel@netl.doe.gov Ronald Breault Project Manager National Energy Technology Laboratory 3610 Collins Ferry Road P.O. Box 880 Morgantown, WV 26507 304-285-4486 ronald.breault@netl.doe.gov Herbert E. andrus, Jr. Principal Investigator ALSTOM Power 2000 Day Hill Rd. Windsor, CT 06095 860-285-4770 herbert.e.andrus@power.alstom.com Hybrid Combustion-GasifiCation CHemiCal loopinG Coal power teCHnoloGy development Description Gasification technologies can provide a stable, affordable energy supply for the nation, while also providing high efficiencies and near zero pollutants. With coal

397

Geothermal Loop Experimental Facility. Quarterly report, April-June 1979  

DOE Green Energy (OSTI)

Since the Geothermal Loop Experimental Facility (GLEF) start-up in May, 1976, a substantial amount of information has been obtained on the operation of the plant and its components, brine and steam composition, production and injection wells, and the potential of the Niland Reservoir. The GLEF was modified in April, 1978, from a four stage flash/binary process to a two stage flash cycle for the extraction of energy from a high temperature, high salinity, liquid-dominated resource. A Reactor Clarifier/Media Filter System was put in operation in May, 1979 to demonstrate that suspended solids in the brine could be removed prior to brine injection into the reservoir. The general operations and accomplishments of the GLEF during the period are summarized.

Anastas, G.; Bischoff, W.S.; Bishop, H.K.

1979-07-01T23:59:59.000Z

398

MULTIOBJECTIVE OPTIMIZATION POWER GENERATION SYSTEMS INVOLVING CHEMICAL LOOPING COMBUSTION  

SciTech Connect

Integrated Gasification Combined Cycle (IGCC) system using coal gasification is an important approach for future energy options. This work focuses on understading the system operation and optimizing it in the presence of uncertain operating conditions using ASPEN Plus and CAPE-OPEN compliant stochastic simulation and multiobjective optimization capabilities developed by Vishwamitra Research Institute. The feasible operating surface for the IGCC system is generated and deterministic multiobjective optimization is performed. Since the feasible operating space is highly non-convex, heuristics based techniques that do not require gradient information are used to generate the Pareto surface. Accurate CFD models are simultaneously developed for the gasifier and chemical looping combustion system to characterize and quantify the process uncertainty in the ASPEN model.

Juan M. Salazar; Urmila M. Diwekar; Stephen E. Zitney

2009-01-01T23:59:59.000Z

399

Minimally doubled fermions at one-loop level  

E-Print Network (OSTI)

Single fermionic degrees of freedom together with standard chiral symmetry at finite lattice spacing, correct continuum limit and local interactions only are precluded by the Nielsen-Ninomiya no-go theorem. The class of minimally doubled fermion actions exhibits exactly two chiral modes. Recent interest in these actions has been sparked by the investigation of fermionic actions defined on "hyperdiamond" lattices. Due to the necessity of breaking hypercubic symmetry explicitly, radiative corrections generate operator mixings with relevant and marginal operators that should vanish in continuum QCD. These cannot be avoided and must be taken into account in particular by a peculiar wave-function renormalisation and additive momentum renormalisation. Renormalisation properties at one-loop level of the self-energy, local bilinears and conserved vector and axial-vector currents are presented for Borici-Creutz and Karsten-Wilczek actions. Distinct differences and similarities between both actions are elucidated.

Capitani, Stefano; Wittig, Hartmut

2009-01-01T23:59:59.000Z

400

Geothermal Loop Experimental Facility. Quarterly report, October-December 1978  

DOE Green Energy (OSTI)

The Geothermal Loop Experimental Facility (GLEF) was modified in April 1978 from a four stage flash/binary process to a two stage cycle for the extraction of energy from a high temperature, high salinity, liquid-dominated resource. The overhaul and cleaning during October and pigging problems which led to a limited shutdown in December are discussed. Reservoir assessment, including production and injection wells, are discussed. Results of tests that were accomplished are included. Laboratory data obtained for steam, brine, binary and cooling water, and scale are indicated. Any equipment that required repairs or modifications to equipment and the clarifier/media filter are discussed. The status of the feasibility and surge studies is covered. (MHR)

Anastas, G.; Bischoff, W.S.; Bishop, H.K.

1979-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "active closed loop" 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

On the Semiclassical Limit of Loop Quantum Cosmology  

E-Print Network (OSTI)

We consider a k=0 Friedman-Robertson-Walker (FRW) model within loop quantum cosmology (LQC) and explore the issue of its semiclassical limit. The model is exactly solvable and allows us to construct analytical (Gaussian) coherent-state solutions for each point on the space of classical states. We propose physical criteria that select from these coherent states, those that display semiclassical behavior, and study their properties in the deep Planck regime. Furthermore, we consider generalized squeezed states and compare them to the Gaussian states. The issue of semiclassicality preservation across the bounce is studied and shown to be generic for all the states considered. Finally, we comment on some implications these results have, depending on the topology of the spatial slice. In particular we consider the issue of the recovery, within our class of states, of a scaling symmetry present in the classical description of the system when the spatial topology is non-compact.

Alejandro Corichi; Edison Montoya

2011-05-13T23:59:59.000Z

402

Geothermal Loop Experimental Facility. Quarterly report, April--June 1978  

DOE Green Energy (OSTI)

The Geothermal Loop Experimental Facility (GLEF) was modified to use a two stage flash process with two parallel flash trains for the extraction of energy from a high temperature, high salinity, liquid-dominated resource. Since plant start-up in May 1976, a substantial amount of information has been obtained on the operation of the plant, components, brine and steam composition, production and injection wells, and the potential of the Niland Reservoir. The general operation and accomplishments of the GLEF during the period April 1978 through June 1978 are discussed. The GLEF underwent a major redesign. Modifications and inspections of various GLEF equipment and systems are also discussed. Information about the production and injection wells flow testing and instrumentation are discussed. Information regarding coatings and linings for valves and piping is included. In the Chemistry Section there is a wide range of data taken from Brine, Steam, Scale, Binary, Condensate, and Cooling Water Systems.

Bischoff, W.S.; Bishop, H.K.; Cooney, C.S.; Hanenburg, W.H.; Hoaglin, G.J.; Jacobson, W.O.; Mulliner, D.K.; Newell, D.G.; Swanson, C.R.

1978-07-01T23:59:59.000Z

403

Hanford Tank Farms Waste Certification Flow Loop Test Plan  

Science Conference Proceedings (OSTI)

A future requirement of Hanford Tank Farm operations will involve transfer of wastes from double shell tanks to the Waste Treatment Plant. As the U.S. Department of Energy contractor for Tank Farm Operations, Washington River Protection Solutions anticipates the need to certify that waste transfers comply with contractual requirements. This test plan describes the approach for evaluating several instruments that have potential to detect the onset of flow stratification and critical suspension velocity. The testing will be conducted in an existing pipe loop in Pacific Northwest National Laboratory’s facility that is being modified to accommodate the testing of instruments over a range of simulated waste properties and flow conditions. The testing phases, test matrix and types of simulants needed and the range of testing conditions required to evaluate the instruments are described

Bamberger, Judith A.; Meyer, Perry A.; Scott, Paul A.; Adkins, Harold E.; Wells, Beric E.; Blanchard, Jeremy; Denslow, Kayte M.; Greenwood, Margaret S.; Morgen, Gerald P.; Burns, Carolyn A.; Bontha, Jagannadha R.

2010-01-01T23:59:59.000Z

404

A Radiation Tolerant Phase Locked Loop Design for Digital Electronics  

E-Print Network (OSTI)

With decreasing feature sizes, lowered supply voltages and increasing operating frequencies, the radiation tolerance of digital circuits is becoming an increasingly important problem. Many radiation hardening techniques have been presented in the literature for combinational as well as sequential logic. However, the radiation tolerance of clock generation circuitry has received scant attention to date. Recently, it has been shown that in the deep submicron regime, the clock network contributes significantly to the chip level Soft Error Rate (SER). The on-chip Phase Locked Loop (PLL) is particularly vulnerable to radiation strikes. In this thesis, we present a radiation hardened PLL design. Each of the components of this design-the voltage controlled oscillator (VCO), the phase frequency detector (PFD) and the charge pump/loop filter-are designed in a radiation tolerant manner. Whenever possible, the circuit elements used in our PLL exploit the fact that if a gate is implemented using only PMOS (NMOS) transistors then a radiation particle strike can result only in a logic 0 to 1 (1 to 0) flip. By separating the PMOS and NMOS devices, and splitting the gate output into two signals, extreme high levels of radiation tolerance are obtained. Our design uses two VCOs (with cross-coupled inverters) and charge pumps, so that a strike on any one is compensated by the other. Our PLL is tested for radiation immunity for critical charge values up to 250fC. Our SPICE-based results demonstrate that after exhaustively striking all circuit nodes, the worst case jitter of our hardened PLL is just 37.4 percent. In the worst case, our PLL returns to the locked state in 2 cycles of the VCO clock, after a radiation strike. These numbers are significant improvements over those of the best previously reported approaches.

Kumar, Rajesh

2010-08-01T23:59:59.000Z

405

State Energy Efficient Appliance Rebate Program is Closed | Department of  

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

State Energy Efficient Appliance Rebate Program is Closed State Energy Efficient Appliance Rebate Program is Closed State Energy Efficient Appliance Rebate Program is Closed February 23, 2012 - 5:22am Addthis Andrea Spikes Communicator at DOE's National Renewable Energy Laboratory On Friday, February 17, 2012, the State Energy Efficient Appliance Rebate Program closed officially in all U.S. states and territories. Although the program had already closed in most states by this time, there were 11 states and territories that closed last Friday. The appliance rebate program has been a huge success across the country, and we've been getting results periodically. As of December 31, 2011, a total of 1.7 million consumer rebates, valued at $258 million, have been paid to consumers. The annual energy savings resulting from the purchase of

406

Enhanced Control of Powder Yields from Close-Coupled Gas ...  

Science Conference Proceedings (OSTI)

Abstract Scope, Advanced designs for discrete-jet close-coupled (DJ-CC) gas atomization nozzles and melt feed tubes have been developed to enable powder

407

Idaho Site Closes Out Decontamination and Decommissioning Project...  

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

FALLS, Idaho - The Idaho Cleanup Project (ICP) successfully closed out a 796 million nuclear facility decontamination and decommissioning project. The work was completed about...

408

Closed FOAs | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

(FOAs) Open FOAs Closed FOAs DOE National Laboratory Announcements Grants Process Grants Policy and Guidance FAQs Resources Contract Information Contact Information Grants &...

409

Quantitative Assessment of Human-Induced Loss of Offsite Power (HI-LOOP) Event Frequencies at U.S. Commercial Nuclear Power Plants (NPP)  

Science Conference Proceedings (OSTI)

This report provides a framework for developing improved methods and models for quantifying the frequencies of human-induced loss of offsite power (HI-LOOP) initiators at U.S. commercial nuclear power plants (NPPs). Leveraging these methods and models should enhance the NPP probabilistic risk assessment model completeness and would be useful for the NPP on-line risk models. The primary focus of the report is on investigating the impact of human activities on the frequencies of switchyard-centered ...

2013-04-04T23:59:59.000Z

410

Development of Computational Approaches for Simulation and Advanced Controls for Hybrid Combustion-Gasification Chemical Looping  

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

Computational Approaches Computational Approaches for Simulation and Advanced Controls for Hybrid Combustion-Gasification Chemical Looping Background The United States Department of Energy (DOE) National Energy Technology Laboratory (NETL) develops affordable and clean energy from coal and other fossil fuels to secure a sustainable energy economy. To further this mission, NETL funds research and development of advanced control technologies, including chemical looping (CL)

411

Loop transformations in the ahead-of-time optimization of java bytecode  

Science Conference Proceedings (OSTI)

Loop optimizations such as loop unrolling, unfolding and invariant code motion have long been used in a wide variety of compilers to improve the running time of applications. In this paper we present a series of experimental results detailing the effect ...

Simon Hammond; David Lacey

2006-03-01T23:59:59.000Z

412

A time management optimization framework for large-scale distributed hardware-in-the-loop simulation  

Science Conference Proceedings (OSTI)

Large-scale distributed HIL(Hardware-In-The-Loop) simulation is an important and indispensable method for testing and verifying complex engineering systems. An important necessary condition for realizing HIL simulation is that the speedup ratio of full-speed ... Keywords: hardware-in-the-loop simulation, large-scale distributed simulation, optimization framework, speedup ratio of simulation, time management

Wei Dong

2013-05-01T23:59:59.000Z

413

Profitable loop fusion and tiling using model-driven empirical search  

Science Conference Proceedings (OSTI)

Loop fusion and tiling are both recognized as effective transformations for improving memory performance of scientific applications. However, because of their sensitivity to the underlying cache architecture and their interaction with each other it is ... Keywords: empirical tuning, loop fusion, memory hierarchy, tiling

Apan Qasem; Ken Kennedy

2006-06-01T23:59:59.000Z

414

Scaling of hybrid-electric vehicle powertrain components for Hardware-in-the-loop simulation  

E-Print Network (OSTI)

Scaling of hybrid-electric vehicle powertrain components for Hardware-in-the-loop simulation: Hardware-in-the-loop Hybrid electric vehicle Buckingham Pi Theorem Battery model a b s t r a c t Hardware between the highly coupled subsystems typically found in an electric or hybrid-electric vehicle

Brennan, Sean

415

Fuzzy incremental control algorithm of loop heat pipe cooling system for spacecraft applications  

Science Conference Proceedings (OSTI)

Reliable and high precision thermal control technologies are essential for the safe flight of advanced spacecraft. A fuzzy incremental control strategy is proposed for control of an LHP space cooling system comprising a loop heat pipe and a variable ... Keywords: Fuzzy incremental control, Loop heat pipe, Modeling and simulation, Space cooling system

Su-Jun Dong; Yun-Ze Li; Jin Wang; Jun Wang

2012-09-01T23:59:59.000Z

416

Energy-Aware Loop Parallelism Maximization for Multi-core DSP Architectures  

Science Conference Proceedings (OSTI)

With the advance of semiconductor, multi-core architecture is inevitable in today's embedded system design. Nested loops are usually the most critical part in multimedia and high performance DSP (Digital Signal Processing) systems. Hence, maximizing ... Keywords: Energy, multi-core, loop parallelization, retiming, voltage assignment

Meikang Qiu; Jian-Wei Niu; Laurence T. Yang; Xiao Qin; Senlin Zhang; Bin Wang

2010-12-01T23:59:59.000Z

417

CURRENT STATUS OF INSTRUMENTATION FOR A FLUORIDE SALT HEAT TRANSPORT DEMONSTRATION LOOP  

SciTech Connect

A small forced convection liquid fluoride salt loop is under construction at Oak Ridge National Laboratory (ORNL) to examine the heat transfer behavior of FLiNaK in a heated pebble bed. Loop operation serves several purposes: (1) reestablishing the infrastructure necessary for fluoride salt loop testing, (2) demonstrating a wireless heating technique for simulating pebble type fuel, (3) demonstration of the integration of silicon carbide (SiC) and metallic components into a liquid salt loop, and (4) demonstration of the functionality of distinctive instrumentation required for liquid fluoride salts. Loop operation requires measurement of a broad set of process variables including temperature, flow, pressure, and level. Coolant chemistry measurements (as a corrosion indicator) and component health monitoring are also important for longer-term operation. Two dominating factors in sensor and instrument selection are the high operating temperature of the salt and its chemical environment.

Kisner, Roger A [ORNL; Holcomb, David Eugene [ORNL

2010-01-01T23:59:59.000Z

418

Stability and bifurcation of a soap film spanning an elastic loop  

E-Print Network (OSTI)

The Euler--Plateau problem, proposed by \\cite{gm}, concerns a soap film spanning a flexible loop. The shapes of the film and the loop are determined by the interactions between the two components. In the present work, the Euler--Plateau problem is reformulated to yield a boundary-value problem for a vector field that parameterizes both the spanning surface and the bounding loop. Using the first and second variations of the relevant free-energy functional, detailed bifurcation and stability analyses are performed. For spanning surface with energy density $\\sigma$ and a bounding loop with length $2\\pi R$ and bending rigidity $a$, the first bifurcation, during which the spanning surface remains flat but the bounding loop becomes noncircular, occurs at $\\sigma R^3/a=3$, confirming a result obtained previously via an energy comparison. Other bifurcation solution branches, including those emanating from the flat circular solution branch to nonplanar solution branches, are also shown to be unstable.

Yi-chao Chen; Eliot Fried

2013-07-12T23:59:59.000Z

419

Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses  

E-Print Network (OSTI)

Following an introduction, the author describes Texas A&M University and its utilities system. After that, the author presents how to construct simulation models for chilled water and heating hot water distribution systems. The simulation model was used in a $2.3 million Ross Street chilled water pipe replacement project at Texas A&M University. A second project conducted at the University of Texas at San Antonio was used as an example to demonstrate how to identify and design an optimal distribution system by using a simulation model. The author found that the minor losses of these closed loop thermal distribution systems are significantly higher than potable water distribution systems. In the second part of the report, the author presents the latest development of software called the Plant Optimization Program, which can simulate cogeneration plant operation, estimate its operation cost and provide optimized operation suggestions. The author also developed detailed simulation models for a gas turbine and heat recovery steam generator and identified significant potential savings. Finally, the author also used a steam turbine as an example to present a multi-regression method on constructing simulation models by using basic statistics and optimization algorithms. This report presents a survey of the author??s working experience at the Energy Systems Laboratory (ESL) at Texas A&M University during the period of January 2002 through March 2004. The purpose of the above work was to allow the author to become familiar with the practice of engineering. The result is that the author knows how to complete a project from start to finish and understands how both technical and nontechnical aspects of a project need to be considered in order to ensure a quality deliverable and bring a project to successful completion. This report concludes that the objectives of the internship were successfully accomplished and that the requirements for the degree of Degree of Engineering have been satisfied.

Chen, Qiang

2005-05-01T23:59:59.000Z

420

Core-support performance test in the component-flow test loop  

Science Conference Proceedings (OSTI)

The CFTL is a closed-circuit, out-of-pile loop circulating helium at temperatures and pressures anticipated in gas-cooled reactors at flows sufficiently large to perform engineering-scale tests. It has the present capability for fast data acquisition and the control and measurement of gaseous impurities, and it has the potential to perform controlled rapid transients in pressure, flow, and power. The initial HTGR component to be tested in the CFTL is the core support structure for the prismatic bed HTGR. This structure has vertical posts mating with post seats, each with spherical curvatures of different radii. At the point of contact, Hertzian stress concentrations are produced. Under the load of the weight of the core plus the pressure gradient, the graphite will deform until the stress is below its yield limit. The Core Support Performance Test (CSPT) will subject this interface, using actual materials and geometry, to impure helium at HTGR operating temperatures, pressures, and flows under a simulated structural load. The concentration of water, hydrogen, and carbon dioxide will be controlled so that six months of test operation will simulate 40 years of reactor operation. The specification of this concentration is based on existing studies involving small graphite samples exposed to a variety of conditions at a few atmospheres. The extrapolation to concentrations that will duplicate both the amount and the nature of the corrosion is based on the oxidation kinetics of the Gadsby equation as parameterized by Velasquez. Ports are provided in the test vessel for in situ inspection of the graphite during the test period. Post-test examination of the structure will be used to correlate its performance with available computational methods.

Sanders, J.P.; Grindell, A.G.; Eatherly, W.P.

1982-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "active closed loop" 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

On closed Weingarten surfaces Wolfgang K uhnel and Michael Steller  

E-Print Network (OSTI)

; This list is, of course, not exhausting. It is not di#cult to obtain closed smooth Wein­ garten surfaces for higher genus. However, K.Voss proved in [10] that a closed analytic Wein­ garten surface of genus zero

Kuehnel, Wolfgang

422

Free Minor Closed Classes and the Kuratowski theorem. Dainis ZEPS  

E-Print Network (OSTI)

Free Minor Closed Classes and the Kuratowski theorem. Dainis ZEPS Abstract Free-minor closed classes [2] and free-planar graphs [3] are considered. Versions of Kuratowski-like theorem for free example is free-planar graphs [3]. A planar graph is called free-planar, if after adding an arbitrary edge

Paris-Sud XI, Université de

423

DOE Closes Investigation of Whirlpool's Maytag Refrigerator | Department of  

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

Closes Investigation of Whirlpool's Maytag Refrigerator Closes Investigation of Whirlpool's Maytag Refrigerator DOE Closes Investigation of Whirlpool's Maytag Refrigerator July 8, 2010 - 3:12pm Addthis The Department of Energy has closed its investigation into the energy efficiency of Whirlpool's Maytag refrigerator-freezer model "MSD2578VE." The Department opened this investigation and requested testing data from Whirlpool based on a complaint (April 12, 2010, "DOE Opens Three Investigations into Alleged Refrigerator Efficiency Violations"). After reviewing the data and testing this model, the Department has found the model to be compliant with the applicable efficiency standards and has closed the investigation. The Department takes credible allegations seriously and will continue to initiate investigations on products that are

424

OBSERVATIONS OF RECONNECTING FLARE LOOPS WITH THE ATMOSPHERIC IMAGING ASSEMBLY  

SciTech Connect

Perhaps the most compelling evidence for the role of magnetic reconnection in solar flares comes from the supra-arcade downflows that have been observed above many post-flare loop arcades. These downflows are thought to be related to highly non-potential field lines that have reconnected and are propagating away from the current sheet. We present new observations of supra-arcade downflows taken with the Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory (SDO). The morphology and dynamics of the downflows observed with AIA provide new evidence for the role of magnetic reconnection in solar flares. With these new observations we are able to measure downflows originating at larger heights than in previous studies. We find, however, that the initial velocities measured here ({approx}144 km s{sup -1}) are well below the Alfven speed expected in the lower corona, and consistent with previous results. We also find no evidence that the downflows brighten with time, as would be expected from chromospheric evaporation. These observations suggest that simple two-dimensional models cannot explain the detailed observations of solar flares.

Warren, Harry P.; Sheeley, Neil R. Jr. [Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States); O'Brien, Casey M. [Also at Massachusetts Institute of Technology, Cambridge, MA 02139, USA. (United States)

2011-12-01T23:59:59.000Z

425

Loop Quantum Cosmology in Bianchi Type I Models: Analytical Investigation  

E-Print Network (OSTI)

The comprehensive formulation for loop quantum cosmology in the spatially flat, isotropic model was recently constructed. In this paper, the methods are extended to the anisotropic Bianchi I cosmology. Both the precursor and the improved strategies are applied and the expected results are established: (i) the scalar field again serves as an internal clock and is treated as emergent time; (ii) the total Hamiltonian constraint is derived by imposing the fundamental discreteness and gives the evolution as a difference equation; and (iii) the physical Hilbert space, Dirac observables and semi-classical states are constructed rigorously. It is also shown that the state in the kinematical Hilbert space associated with the classical singularity is decoupled in the difference evolution equation, indicating that the big bounce may take place when any of the area scales undergoes the vanishing behavior. The investigation affirms the robustness of the framework used in the isotropic model by enlarging its domain of validity and provides foundations to conduct the detailed numerical analysis.

Dah-Wei Chiou

2006-09-07T23:59:59.000Z

426

Oriented Matroids -- Combinatorial Structures Underlying Loop Quantum Gravity  

E-Print Network (OSTI)

We analyze combinatorial structures which play a central role in determining spectral properties of the volume operator in loop quantum gravity (LQG). These structures encode geometrical information of the embedding of arbitrary valence vertices of a graph in 3-dimensional Riemannian space, and can be represented by sign strings containing relative orientations of embedded edges. We demonstrate that these signature factors are a special representation of the general mathematical concept of an oriented matroid. Moreover, we show that oriented matroids can also be used to describe the topology (connectedness) of directed graphs. Hence the mathematical methods developed for oriented matroids can be applied to the difficult combinatorics of embedded graphs underlying the construction of LQG. As a first application we revisit the analysis of [4-5], and find that enumeration of all possible sign configurations used there is equivalent to enumerating all realizable oriented matroids of rank 3, and thus can be greatly simplified. We find that for 7-valent vertices having no coplanar triples of edge tangents, the smallest non-zero eigenvalue of the volume spectrum does not grow as one increases the maximum spin $\\jmax$ at the vertex, for any orientation of the edge tangents. This indicates that, in contrast to the area operator, considering large $\\jmax$ does not necessarily imply large volume eigenvalues. In addition we give an outlook to possible starting points for rewriting the combinatorics of LQG in terms of oriented matroids.

Johannes Brunnemann; David Rideout

2010-03-11T23:59:59.000Z

427

Chimera: A hybrid approach to numerical loop quantum cosmology  

E-Print Network (OSTI)

The existence of a quantum bounce in isotropic spacetimes is a key result in loop quantum cosmology (LQC), which has been demonstrated to arise in all the models studied so far. In most of the models, the bounce has been studied using numerical simulations involving states which are sharply peaked and which bounce at volumes much larger than the Planck volume. An important issue is to confirm the existence of the bounce for states which have a wide spread, or which bounce closer to the Planck volume. Numerical simulations with such states demand large computational domains, making them very expensive and practically infeasible with the techniques which have been implemented so far. To overcome these difficulties, we present an efficient hybrid numerical scheme using the property that at the small spacetime curvature, the quantum Hamiltonian constraint in LQC, which is a difference equation with uniform discretization in volume, can be approximated by a Wheeler-DeWitt differential equation. By carefully choosing a hybrid spatial grid allowing the use of partial differential equations at large volumes, and with a simple change of geometrical coordinate, we obtain a surprising reduction in the computational cost. This scheme enables us to explore regimes which were so far unachievable for the isotropic model in LQC. Our approach also promises to significantly reduce the computational cost for numerical simulations in anisotropic LQC using high performance computing.

Peter Diener; Brajesh Gupt; Parampreet Singh

2013-10-17T23:59:59.000Z

428

Phenylnaphthalene Derivatives as Heat Transfer Fluids for Concentrating Solar Power: Loop Experiments and Final Report  

SciTech Connect

ORNL and subcontractor Cool Energy completed an investigation of higher-temperature, organic thermal fluids for solar thermal applications. Although static thermal tests showed promising results for 1-phenylnaphthalene, loop testing at temperatures to 450 C showed that the material isomerized at a slow rate. In a loop with a temperature high enough to drive the isomerization, the higher melting point byproducts tended to condense onto cooler surfaces. So, as experienced in loop operation, eventually the internal channels of cooler components such as the waste heat rejection exchanger may become coated or clogged and loop performance will decrease. Thus, pure 1-phenylnaphthalene does not appear to be a fluid that would have a sufficiently long lifetime (years to decades) to be used in a loop at the increased temperatures of interest. Hence a decision was made not to test the ORNL fluid in the loop at Cool Energy Inc. Instead, Cool Energy tested and modeled power conversion from a moderate-temperature solar loop using coupled Stirling engines. Cool Energy analyzed data collected on third and fourth generation SolarHeart Stirling engines operating on a rooftop solar field with a lower temperature (Marlotherm) heat transfer fluid. The operating efficiencies of the Stirling engines were determined at multiple, typical solar conditions, based on data from actual cycle operation. Results highlighted the advantages of inherent thermal energy storage in the power conversion system.

McFarlane, Joanna [ORNL; Bell, Jason R [ORNL; Felde, David K [ORNL; Joseph III, Robert Anthony [ORNL; Qualls, A L [ORNL; Weaver, Samuel P [ORNL

2013-02-01T23:59:59.000Z

429

DETECTING NANOFLARE HEATING EVENTS IN SUBARCSECOND INTER-MOSS LOOPS USING Hi-C  

SciTech Connect

The High-resolution Coronal Imager (Hi-C) flew aboard a NASA sounding rocket on 2012 July 11 and captured roughly 345 s of high-spatial and temporal resolution images of the solar corona in a narrowband 193 A channel. In this paper, we analyze a set of rapidly evolving loops that appear in an inter-moss region. We select six loops that both appear in and fade out of the Hi-C images during the short flight. From the Hi-C data, we determine the size and lifetimes of the loops and characterize whether these loops appear simultaneously along their length or first appear at one footpoint before appearing at the other. Using co-aligned, co-temporal data from multiple channels of the Atmospheric Imaging Assembly on the Solar Dynamics Observatory, we determine the temperature and density of the loops. We find the loops consist of cool ({approx}10{sup 5} K), dense ({approx}10{sup 10} cm{sup -3}) plasma. Their required thermal energy and their observed evolution suggest they result from impulsive heating similar in magnitude to nanoflares. Comparisons with advanced numerical simulations indicate that such dense, cold and short-lived loops are a natural consequence of impulsive magnetic energy release by reconnection of braided magnetic field at low heights in the solar atmosphere.

Winebarger, Amy R.; Moore, Ronald; Cirtain, Jonathan [NASA Marshall Space Flight Center, ZP 13, Huntsville, AL 35812 (United States); Walsh, Robert W. [University of Central Lancashire, Preston, Lancashire PR1 2HE (United Kingdom); De Pontieu, Bart; Title, Alan [Lockheed Martin Solar and Astrophysics Lab, 3251 Hanover St., Org. A0215, Bldg. 252, Palo Alto, CA 94304 (United States); Hansteen, Viggo [Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029 Blindern, N-0315 Oslo (Norway); Golub, Leon; Korreck, Kelly; Weber, Mark [Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138 (United States); Kobayashi, Ken [Center for Space Plasma and Aeronomic Research, University of Alabama in Huntsville, 320 Sparkman Dr, Huntsville, AL 35805 (United States); DeForest, Craig [Southwest Research Institute, 1050 Walnut Street, Suite 300, Boulder, CO 80302 (United States); Kuzin, Sergey, E-mail: amy.r.winebarger@nasa.gov [P.N. Lebedev Physical institute of the Russian Academy of Sciences, Leninskii prospekt 53 119991, Moscow (Russian Federation)

2013-07-01T23:59:59.000Z

430

Corrosion of type 316L stainless steel in a mercury thermal convection loop  

SciTech Connect

Two thermal convection loops fabricated from 316L stainless steel containing mercury (Hg) and Hg with 1000 wppm gallium (Ga), respectively, were operated continuously for about 5000 h. In each case, the maximum loop temperature was constant at about 305 degrees C and the minimum temperature was constant at about 242 degrees C. Coupons in the hot leg of the Hg-loop developed a posous surface layer substantially depleted of nickel and chromium, which resulted in a transformation to ferrite. The coupon exposed at the top of the hot leg in the Hg-loop experienced the maximum degradation, exhibiting a surface layer extending an average of 9-10 mu m after almost 5000 h. Analysis of the corrosion rate data as a function of temperature (position) in the Hg-loop suggests wetting by the mer cury occurred only above about 255 degrees C and that the rate limiting step in the corrosion process above 255 degrees C is solute diffusion through the saturated liquid boundary layer adjacent to the corroding surface. The latter factor suggests that the corrosion of 316L stainless steel in a mercury loop may be velocity dependent. No wetting and no corrosion were observed on the coupons and wall specimens removed from the Hg/Ga loop after 5000 h of operation.

DiStefano, J.R.; Manneschmidt, E.T.; Pawel, S.J.

1999-04-01T23:59:59.000Z

431

ANALYSIS AND MODELING OF TWO FLARE LOOPS OBSERVED BY AIA AND EIS  

Science Conference Proceedings (OSTI)

We analyze and model an M1.0 flare observed by SDO/AIA and Hinode/EIS to investigate how flare loops are heated and evolve subsequently. The flare is composed of two distinctive loop systems observed in extreme ultraviolet (EUV) images. The UV 1600 A emission at the feet of these loops exhibits a rapid rise, followed by enhanced emission in different EUV channels observed by the Atmospheric Imaging Assembly (AIA) and the EUV Imaging Spectrometer (EIS). Such behavior is indicative of impulsive energy deposit and the subsequent response in overlying coronal loops that evolve through different temperatures. Using the method we recently developed, we infer empirical heating functions from the rapid rise of the UV light curves for the two loop systems, respectively, treating them as two big loops with cross-sectional area of 5'' by 5'', and compute the plasma evolution in the loops using the EBTEL model. We compute the synthetic EUV light curves, which, with the limitation of the model, reasonably agree with observed light curves obtained in multiple AIA channels and EIS lines: they show the same evolution trend and their magnitudes are comparable by within a factor of two. Furthermore, we also compare the computed mean enthalpy flow velocity with the Doppler shift measurements by EIS during the decay phase of the two loops. Our results suggest that the two different loops with different heating functions as inferred from their footpoint UV emission, combined with their different lengths as measured from imaging observations, give rise to different coronal plasma evolution patterns captured both in the model and in observations.

Li, Y.; Ding, M. D. [School of Astronomy and Space Science, Nanjing University, Nanjing 210093 (China); Qiu, J. [Department of Physics, Montana State University, Bozeman, MT 59717 (United States)

2012-10-10T23:59:59.000Z

432

Research on Applying Unidirectional Loop Layout to Optimize Facility Layout in Workshop Based on Improved Genetic Algorithm  

Science Conference Proceedings (OSTI)

As a type of layout which can bring the material transport high flexibility, unidirectional loop layout is widely used in modern workshop layout. This paper deploys research around how to apply a unidirectional loop layout to optimize the facility layout ... Keywords: Unidirectional loop layout, improved genetic algorithm, facility layout, blade manufacturing workshop

Yi Zhang; Hu Zhang; Min-min Xia; Tong-tong Lu; Li-ling Jiang

2009-07-01T23:59:59.000Z

433

DOE Closes Investigation of Arcelik's Blomberg Refrigerator | Department of  

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

Arcelik's Blomberg Refrigerator Arcelik's Blomberg Refrigerator DOE Closes Investigation of Arcelik's Blomberg Refrigerator September 1, 2010 - 4:37pm Addthis The Department of Energy has closed its investigation into the energy efficiency of Arcelik's Blomberg refrigerator-freezer model # BRFB1450. The Department opened this investigation based on a complaint. DOE subpoenaed information from Arcelik, reviewed Arcelik's response, and performed its own testing of this model. Based on our investigation and test results, DOE has determined this model to be compliant with federal energy conservation standards. Notice of Compliance Determination Addthis Related Articles DOE Opens Three Investigations into Alleged Refrigerator Efficiency Violations DOE Closes Investigation of Whirlpool's Maytag Refrigerator

434

Closed String Cohomology in Open String Field Theory  

E-Print Network (OSTI)

We show that closed string states in bosonic string field theory are encoded in the cyclic cohomology of cubic open string field theory (OSFT) which, in turn, classifies the deformations of OSFT. This cohomology is then shown to be independent of the open string background. Exact elements correspond to closed string gauge transformations, generic boundary deformations of Witten's 3-vertex and infinitesimal shifts of the open string background. Finally it is argued that the closed string cohomology and the cyclic cohomology of OSFT are isomorphic to each other.

Moeller, Nicolas

2010-01-01T23:59:59.000Z

435

The Lattice Free Energy with Overlap Fermions: A Two-Loop Result  

E-Print Network (OSTI)

We calculate the 2-loop partition function of QCD on the lattice, using the Wilson formulation for gluons and the overlap-Dirac operator for fermions. Direct by-products of our result are the 2-loop free energy and average plaquette. Our calculation serves also as a prototype for further higher loop calculations in the overlap formalism. We present our results as a function of a free parameter $M_0$ entering the overlap action; the dependence on the number of colors $N$ and fermionic flavors $N_f$ is shown explicitly.

A. Athenodorou; H. Panagopoulos

2004-08-12T23:59:59.000Z

436

Operating experience with gas-bearing circulators in a high-pressure helium loop  

Science Conference Proceedings (OSTI)

A high-pressure engineering test loop has been designed and constructed at the Oak Ridge National Laboratory for circulating helium through a test chamber at temperatures to 1000/sup 0/C. The purpose of this loop is to determine the thermal and structural performance of proposed components for the primary loops of gas-cooled nuclear reactors. Five MW of power is available to provide the required gas temperature at the test chamber, and an air-cooled heat exchanger, rated at 4.4 MW, serves as a heat sink. This report contains results of tests performed on gas-bearing circulators.

Sanders, J.P.; Gat, Uri; Young, H.C.

1987-01-01T23:59:59.000Z

437

EFFICIENT PARALLEL COMPUTATION OF ALL-PAIRS N-BODY ACCELERATION BY DO-LOOP FOLDING  

SciTech Connect

The computational load inside a do loop is equalized by folding the loop appropriately if the amount of load is a linear function of the loop index. Using this idea, we develop an efficient parallel computation scheme of Newtonian all-pairs N-body acceleration vectors with help from OpenMP architecture. Using a consumer PC with a quad-core eight-thread processor, the new parallel scheme runs 4.2-4.9 times faster than a serial computation when the number of particles exceeds a few hundred.

Fukushima, Toshio, E-mail: Toshio.Fukushima@nao.ac.jp [National Astronomical Observatory, Ohsawa, Mitaka, Tokyo 181-8588 (Japan)

2011-07-15T23:59:59.000Z

438

HRP-CP: AN EVALUATION OF THE DESIGN FEATURES OF BLANKET PROCESSING LOOP P- 1  

DOE Green Energy (OSTI)

The design features and the performance of UO/sub 2/SO/sub 4/ blanket processing Loop P-1 are evaluated from an engineering viewpoint. This unique experiment development loop was operated with pump heating to study the behavior of plutonium in 1.4 M UO/sub 2/SO/sub 4/at 250 deg C and was designed for mixed O/ sub 2/-H/sub 2/ gas pressurization The canned loop and the feed and sampling systems in glove boxes completely contained the plutonium throughout the experimental program. (auth)

Snider, J.W.; Clinton, S.D.

1958-10-22T23:59:59.000Z

439

Loop induced interference effects in Higgs Boson plus two jet production at the LHC.  

E-Print Network (OSTI)

ar X iv :0 70 9. 35 13 v2 [ he p- ph ] 22 Fe b 2 00 8 Cavendish-HEP-07/09 Edinburgh 2007/21 Loop induced interference effects in Higgs Boson plus two jet production at the LHC J. R. Andersena, T. Binothb, G. Heinrichb, J. M. Smilliea a... processes allowed at the one-loop level in Higgs boson plus 2 jet production at the LHC. The corresponding one-loop amplitudes, which have not been considered in the lit- erature so far, are evaluated analytically using dimensional regularisation...

Andersen, Jeppe R; Binoth, T; Heinrich, G; Smillie, Jennifer M

440

Meson properties at finite temperature in a three flavor nonlocal chiral quark model with Polyakov loop  

SciTech Connect

We study the finite temperature behavior of light scalar and pseudoscalar meson properties in the context of a three-flavor nonlocal chiral quark model. The model includes mixing with active strangeness degrees of freedom, and takes care of the effect of gauge interactions by coupling the quarks with the Polyakov loop. We analyze the chiral restoration and deconfinement transitions, as well as the temperature dependence of meson masses, mixing angles and decay constants. The critical temperature is found to be T{sub c{approx_equal}}202 MeV, in better agreement with lattice results than the value recently obtained in the local SU(3) PNJL model. It is seen that above T{sub c} pseudoscalar meson masses get increased, becoming degenerate with the masses of their chiral partners. The temperatures at which this matching occurs depend on the strange quark composition of the corresponding mesons. The topological susceptibility shows a sharp decrease after the chiral transition, signalling the vanishing of the U(1){sub A} anomaly for large temperatures.

Contrera, G. A. [Physics Department, Comision Nacional de Energia Atomica, Av.Libertador 8250, (1429) Buenos Aires (Argentina); CONICET, Rivadavia 1917, 1033 Buenos Aires (Argentina); Dumm, D. Gomez [CONICET, Rivadavia 1917, 1033 Buenos Aires (Argentina); IFLP, Dpto. de Fisica, Universidad Nacional de La Plata, C.C. 67, (1900) La Plata (Argentina); Scoccola, Norberto N. [Physics Department, Comision Nacional de Energia Atomica, Av.Libertador 8250, (1429) Buenos Aires (Argentina); CONICET, Rivadavia 1917, 1033 Buenos Aires (Argentina); Universidad Favaloro, Solis 453, (1078) Buenos Aires (Argentina)

2010-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "active closed loop" 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

Nanocomposite oxygen carriers for chemical-looping combustion of sulfur-contaminated synthesis gas  

Science Conference Proceedings (OSTI)

Chemical-looping combustion (CLC) is an emerging technology for clean combustion. We have previously demonstrated that the embedding of metal nanoparticles into a nanostructured ceramic matrix can result in unusually active and sinter-resistant nanocomposite oxygen carrier materials for CLC, which combine the high reactivity of metals with the high-temperature stability of ceramics. In the present study, we investigate the effect of H{sub 2}S in a typical coal-derived syngas on the stability and redox kinetics of Ni- and Cu-based nanostructured oxygen carriers. Both carriers show excellent structural stability and only mildly changed redox kinetics upon exposure to H{sub 2}S, despite a significant degree of sulfide formation. Surprisingly, partial sulfidation of the support results in a strong increase in oxygen carrier capacity in both cases because of the addition of a sulfide-sulfate cycle. Overall, the carriers show great potential for use in CLC of high-sulfur fuels. 21 refs., 13 figs. 1 tab.

Rahul D. Solunke; Goetz Veser [United States Department of Energy, Pittsburgh, PA (United States). National Energy Technology Laboratory

2009-09-15T23:59:59.000Z

442

Cooling by Heat Conduction Inside Magnetic Flux Loops and the Moderate Cluster Cooling Flow Model  

E-Print Network (OSTI)

I study non-radiative cooling of X-ray emitting gas via heat conduction along magnetic field lines inside magnetic flux loops in cooling flow clusters of galaxies. I find that such heat conduction can reduce the fraction of energy radiated in the X-ray band by a factor of 1.5-2. This non-radiative cooling joins two other proposed non-radiative cooling processes, which can be more efficient. These are mixing of cold and hot gas, and heat conduction initiated by magnetic fields reconnection between hot and cold gas. These processes when incorporated into the moderate cooling flow model lead to a general cooling flow model with the following ingredients. (1) Cooling flow does occur, but with a mass cooling rate about 10 times lower than in old versions of the cooling flow model. Namely, heating occurs such that the effective age of the cooling flow is much below the cluster age, but the heating can't prevent cooling altogether. (2) The cooling flow region is in a non-steady state evolution. (3) Non-radiative cooling of X-ray emitting gas can bring the model to a much better agreement with observations. (4) The general behavior of the cooling flow gas, and in particular the role played by magnetic fields, make the intracluster medium in cooling flow clusters similar in some aspects to the active solar corona.

Noam Soker

2003-11-02T23:59:59.000Z

443

Effect of steam generator configuration in a loss of the RHR during mid-loop operation at PKL facility  

SciTech Connect

The loss of the residual heat removal system in mid-loop conditions may occur with a non-negligible contribution to the plant risk, so the analysis of the accidental sequences and the actions to mitigate the accident are of great interest in shutdown conditions. In order to plan the appropriate measures to mitigate the accident is necessary to understand the thermal-hydraulic processes following the loss of the residual heat removal system during shutdown. Thus, transients of this kind have been simulated using best-estimate codes in different integral test facilities and compared with experimental data obtained in different facilities. In PKL (Primaerkreislauf-Versuchsanlage, primary coolant loop test facility) test facility different series of experiments have been undertaken to analyze the plant response in shutdown. In this context, the E3 and F2 series consist of analyzing the loss of the residual heat removal system with a reduced inventory in the primary system. In particular, the experiments were developed to investigate the influence of the steam generators secondary side configuration on the plant response, what involves the consideration of different number of steam generators filled with water and ready for activation, on the heat transfer mechanisms inside the steam generators U-tubes. This work presents the results of such experiments calculated using, RELAP5/Mod 3.3. (authors)

Villanueva, J. F.; Carlos, S.; Martorell, S.; Sanchez, F. [Dpto. Ingenieria Quimica Y Nuclear, Universitat Politecnica de Valencia, Camino Vera s/n, 46022 Valencia (Spain)

2012-07-01T23:59:59.000Z

444

Energy Department Receives Prestigious Closing the Circle Awards for  

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

Receives Prestigious Closing the Circle Awards Receives Prestigious Closing the Circle Awards for Environmental Stewardship Energy Department Receives Prestigious Closing the Circle Awards for Environmental Stewardship June 13, 2007 - 1:40pm Addthis DOE Won Four Out of Ten Civilian Awards WASHINGTON, DC - The Department of Energy (DOE) this week received four White House Closing the Circle (CTC) awards, which recognize federal leadership in green purchasing, electronics recycling, and energy efficiency practices. These awards are presented annually by the Office of the Federal Environmental Executive for outstanding achievements of Federal employees and their facilities for efforts that make a significant positive impact on environmental stewardship. "I am proud to accept these awards on behalf of all the employees of the

445

Energy Department Closes Buy American Investigation into Lighting Sales |  

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

Energy Department Closes Buy American Investigation into Lighting Energy Department Closes Buy American Investigation into Lighting Sales Energy Department Closes Buy American Investigation into Lighting Sales September 10, 2010 - 4:56pm Addthis Today, the Department of Energy formally closed its investigation into whether sales to recipients of the Department's Energy Efficiency Community Block Grants by two California companies, US Lighting Tech and American Induction Technologies, Inc., complied with the Buy American provisions of the American Recovery and Reinvestment Act (ARRA). As part of its investigation, the Department engaged a lighting industry expert who reviewed data submitted by the two companies and made site visits to inspect the companies' manufacturing processes. The Department has concluded that the sales were consistent with ARRA's Buy American

446

Chimneys: Keep 'em Clean... and Closed | Department of Energy  

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

Chimneys: Keep 'em Clean... and Closed Chimneys: Keep 'em Clean... and Closed Chimneys: Keep 'em Clean... and Closed October 27, 2008 - 3:34pm Addthis Drew Bittner Web Manager, Office of Energy Efficiency and Renewable Energy Growing up in Wisconsin and New Jersey, my family homes always had a fireplace. They were perfect for cold winter nights, for "indoors camping" or just for sitting near and watching TV. There's very little like the crackle and heat of an open fire. That said, while your fireplace may be decorative, enjoyable, even functional, it's also one other thing: a great big hole going to the outdoors. Many families have glass doors across their fireplaces. That's a good start, but there's something else you should remember to do, and that is keep the chimney closed. It's more than just a good idea; hot air rises,

447

DOE Closes Investigation into Alleged Lighting Efficiency Violations |  

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

DOE Closes Investigation into Alleged Lighting Efficiency DOE Closes Investigation into Alleged Lighting Efficiency Violations DOE Closes Investigation into Alleged Lighting Efficiency Violations April 16, 2010 - 10:39am Addthis The U.S. Department of Energy has closed its investigation into the energy efficiency of lighting products manufactured by Habitex Corporation and sold under the Target and Adesso brand names based on test data provided by the companies. The Department requested information from the three companies last month in response to a complaint that these products did not meet the Department's energy efficiency standards for torchieres. Responding promptly to the Department's inquiry, the companies provided test data showing that these products did not meet the Energy Policy and Conservation Act's definition of torchiere and, as a result, did not

448

Energy Department Receives Prestigious Closing the Circle Awards for  

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

Energy Department Receives Prestigious Closing the Circle Awards Energy Department Receives Prestigious Closing the Circle Awards for Environmental Stewardship Energy Department Receives Prestigious Closing the Circle Awards for Environmental Stewardship June 13, 2007 - 1:40pm Addthis DOE Won Four Out of Ten Civilian Awards WASHINGTON, DC - The Department of Energy (DOE) this week received four White House Closing the Circle (CTC) awards, which recognize federal leadership in green purchasing, electronics recycling, and energy efficiency practices. These awards are presented annually by the Office of the Federal Environmental Executive for outstanding achievements of Federal employees and their facilities for efforts that make a significant positive impact on environmental stewardship. "I am proud to accept these awards on behalf of all the employees of the

449

DOE Closes Investigation into Energy Efficiency of Viking Refrigerator |  

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

Closes Investigation into Energy Efficiency of Viking Closes Investigation into Energy Efficiency of Viking Refrigerator DOE Closes Investigation into Energy Efficiency of Viking Refrigerator November 9, 2010 - 7:30pm Addthis The Department of Energy has closed its investigation into the energy efficiency of Viking Range Corporation's refrigerator-freezer model VCSB542. The Department initiated this investigation in response to allegations that the model failed to meet federal energy efficiency standards. After reviewing data provided by Viking for this model, the Department issued a testing demand on June 16, 2010 and initially tested four units, one of which was defective and replaced by a fifth unit. The test results showed that two Viking units failed the federal energy standard for maximum energy use, while two passed. Because of the wide variation in the

450

Game Preserves and Closed Areas (Montana) | Department of Energy  

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

Game Preserves and Closed Areas (Montana) Game Preserves and Closed Areas (Montana) Game Preserves and Closed Areas (Montana) < Back Eligibility Utility Fed. Government Commercial Agricultural Investor-Owned Utility State/Provincial Govt Industrial Construction Municipal/Public Utility Local Government Residential Installer/Contractor Rural Electric Cooperative Tribal Government Low-Income Residential Schools Retail Supplier Institutional Multi-Family Residential Systems Integrator Fuel Distributor Nonprofit General Public/Consumer Transportation Savings Category Alternative Fuel Vehicles Hydrogen & Fuel Cells Buying & Making Electricity Water Home Weatherization Solar Wind Program Info State Montana Program Type Environmental Regulations Provider Montana Fish, Wildlife, and Parks Department Game preserves and closed areas exist within the state of Montana for the

451

Neighborhood Verification: A Strategy for Rewarding Close Forecasts  

Science Conference Proceedings (OSTI)

High-resolution forecasts may be quite useful even when they do not match the observations exactly. Neighborhood verification is a strategy for evaluating the “closeness” of the forecast to the observations within space–time neighborhoods rather ...

Elizabeth E. Ebert

2009-12-01T23:59:59.000Z

452

Asymmetry of Free Circulations in Closed Ocean Gyres  

Science Conference Proceedings (OSTI)

Steady flows in regions of closed geostrophic contours, such as in ocean basins or over seamounts, are examined by calculating solutions to the nonlinear quasigeostrophic and shallow-water equations with topography. For oceanically realistic ...

J. H. LaCasce; O. A. Nřst; P. E. Isachsen

2008-02-01T23:59:59.000Z

453

A Model to Determine Open or Closed Cellular Convection  

Science Conference Proceedings (OSTI)

A simple mechanism is proposed to help explain the observed presence in the atmosphere of open or closed cellular convection. If convection is produced by cooling concentrated near the top of the cloud layer, as in radiative cooling of stratus ...

H. Mark Helfand; Eugenia Kalnay

1983-03-01T23:59:59.000Z

454

Secretary Chu Announces Closing of $117 Million Loan Guarantee...  

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

117 Million Loan Guarantee for Kahuku Wind Power Project Secretary Chu Announces Closing of 117 Million Loan Guarantee for Kahuku Wind Power Project July 27, 2010 - 12:00am...

455

SRS Commemorates P & R Reactor Area Completions - SRS Closes...  

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

SRS Commemorates P & R Reactor Area Completions - SRS Closes the Door on Past Cold War Operations and Opens the Door for Future Missions through Enterprise SRS SRS Commemorates P &...

456

Energy Department Closes Buy American Investigation into Lighting Sales |  

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

Energy Department Closes Buy American Investigation into Lighting Energy Department Closes Buy American Investigation into Lighting Sales Energy Department Closes Buy American Investigation into Lighting Sales September 10, 2010 - 4:56pm Addthis Today, the Department of Energy formally closed its investigation into whether sales to recipients of the Department's Energy Efficiency Community Block Grants by two California companies, US Lighting Tech and American Induction Technologies, Inc., complied with the Buy American provisions of the American Recovery and Reinvestment Act (ARRA). As part of its investigation, the Department engaged a lighting industry expert who reviewed data submitted by the two companies and made site visits to inspect the companies' manufacturing processes. The Department has concluded that the sales were consistent with ARRA's Buy American

457

{open_quotes}Rosshelf{close_quotes} company and development of the Arctic Shelf of Russia  

Science Conference Proceedings (OSTI)

The Russian {open_quotes}Rosshelf{close_quotes} company for developing the shelf is the nucleus of a new branch of industry for developing oil and gas fields on shelves of Russia, primarily in the Arctic. {open_quotes}Rosshelf{close_quotes}, created on the basis of leading naval defence enterprises, Russia`s largest geological and mining enterprises, and territorial organizations managing the northern regions of Russia, obtained a license in March 1993 for the right to use the natural resources of Europe`s largest Shtokman gas-condensate field and Prirazlomnoe oil field in the Barents Sea and thus has all the conditions and possibilities for the successful organization of oil and gas production on the continental shelf of Russia. The goals of {open_quotes}Rosshelf{close_quotes} are: the production of oil and gas equipment at converted defence enterprises, including under foreign license and for export; the development of oil and gas fields on the continental shelf of Russia; the creation of new prospective technologies for offshore oil and gas production under conditions of the Russian and mainly the arctic shelf. {open_quotes}Rosshelf{close_quotes} should develop the Pechora Sea fields, mainly the Prirazlomnoe oil field with its relatively small depth and distance from the shore. It is planned to develop Europe`s largest Shtokman field at a distance of 600 km from the shore in the course of 10-12 years with expenditures of about $6 billion. The use of defence technologies underlying the activities of {open_quotes}Rosshelf{close_quotes} gives the company a real change to reach the world level of offshore oil- and gas-production technology. Broad cooperation with foreign companies, mainly in the area of engineering, finances, ecology, and safety, planned also for this. Calculations show that already the priority projects of {open_quotes}Rosshelf{close_quotes} will provide 250,000-300,000 highly skilled jobs at Russian defence enterprises.

Velikhov, E.P.

1994-09-01T23:59:59.000Z

458

An investigation of synthetic fuel production via chemical looping  

Science Conference Proceedings (OSTI)

Producing liquid hydrocarbon fuels with a reduced greenhouse gas emissions profile would ease the transition to a carbon-neutral energy sector with the transportation industry being the immediate beneficiary followed by the power industry. Revolutionary solutions in transportation, such as electricity and hydrogen, depend on the deployment of carbon capture and storage technologies and/or renewable energy systems. Additionally, high oil prices may increase the development of unconventional sources, such as tar sands, that have a higher emissions profile. One process that is gaining interest is a system for producing reduced carbon fuels though chemical looping technologies. An investigation of the implications of such a process using methane and carbon dioxide that is reformed to yield methanol has been done. An important aspect of the investigation is the use of off-the-shelf technologies to achieve the results. The ability of the process to yield reduced emissions fuels depends on the source for the feed and process heat. For the range of conditions considered, the emissions profile of methanol produced in this method varies from 0.475 to 1.645 moles carbon dioxide per mole methanol. The thermal load can be provided by methane, coal or carbon neutral (biogas). The upper bound can be lowered to 0.750 by applying CCS and/or using nonfossil heat sources for the reforming. The process provides an initial pathway to incorporate CO{sub 2} into fuels independent of electrolytic hydrogen or developments in other sectors of the economy. 22 refs., 1 fig., 3 tabs.

Frank Zeman; Marco Castaldi [Columbia University, New York, NY (United States). Department of Earth and Environmental Engineering

2008-04-15T23:59:59.000Z

459

Molten Salt Test Loop (MSTL) system customer interface document.  

SciTech Connect

The National Solar Thermal Test Facility at Sandia National Laboratories has a unique test capability called the Molten Salt Test Loop (MSTL) system. MSTL is a test capability that allows customers and researchers to test components in flowing, molten nitrate salt. The components tested can range from materials samples, to individual components such as flex hoses, ball joints, and valves, up to full solar collecting systems such as central receiver panels, parabolic troughs, or linear Fresnel systems. MSTL provides realistic conditions similar to a portion of a concentrating solar power facility. The facility currently uses 60/40 nitrate %E2%80%9Csolar salt%E2%80%9D and can circulate the salt at pressure up to 40 bar (600psi), temperature to 585%C2%B0C, and flow rate of 44-50kg/s(400-600GPM) depending on temperature. The purpose of this document is to provide a basis for customers to evaluate the applicability to their testing needs, and to provide an outline of expectations for conducting testing on MSTL. The document can serve as the basis for testing agreements including Work for Others (WFO) and Cooperative Research and Development Agreements (CRADA). While this document provides the basis for these agreements and describes some of the requirements for testing using MSTL and on the site at Sandia, the document is not sufficient by itself as a test agreement. The document, however, does provide customers with a uniform set of information to begin the test planning process.

Gill, David Dennis; Kolb, William J.; Briggs, Ronald D.

2013-09-01T23:59:59.000Z

460

National Benefits of a Closed-Cycle Cooling Retrofit Requirement  

Science Conference Proceedings (OSTI)

The Electric Power Research Institute (EPRI) has investigated the implications of a potential U.S. Environmental Protection Agency (EPA) Clean Water Act 316(b) rulemaking if it establishes closed-cycle cooling retrofits for facilities with once-through cooling as best technology available (BTA) for fish protection. This report provides the results of a study to estimate the benefits of reducing impingement and entrainment mortality that would be achieved should EPA designate closed-cycle cooling as BTA.

2011-08-16T23:59:59.000Z

Note: This page contains sample records for the topic "active closed loop" 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

Pantex High Pressure Fire Loop Project Completed On Time, Under Budget |  

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

High Pressure Fire Loop Project Completed On Time, Under Budget | High Pressure Fire Loop Project Completed On Time, Under Budget | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > Media Room > Press Releases > Pantex High Pressure Fire Loop Project Completed ... Press Release Pantex High Pressure Fire Loop Project Completed On Time, Under Budget

462

V-212: Samba smbd CPU Processing Loop Lets Remote Users Deny Service |  

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

2: Samba smbd CPU Processing Loop Lets Remote Users Deny 2: Samba smbd CPU Processing Loop Lets Remote Users Deny Service V-212: Samba smbd CPU Processing Loop Lets Remote Users Deny Service August 6, 2013 - 6:00am Addthis PROBLEM: A vulnerability was reported in Samba PLATFORM: Samba 3.0.x - 4.0.7 ABSTRACT: All current released versions of Samba are vulnerable to a denial of service on an authenticated or guest connection REFERENCE LINKS: Secunia Advisory SA54436 Samba Security Release CVE-2013-4124 IMPACT ASSESSMENT: Medium DISCUSSION: A malformed packet can cause the smbd server to loop the CPU performing memory allocations and preventing any further service. A connection to a file share, or a local account is needed to exploit this problem, either authenticated or unauthenticated if guest connections are allowed. This

463

Design, fabrication, and characterization of a multi-condenser loop heat pipe  

E-Print Network (OSTI)

A condenser design was characterized for a multi-condenser loop heat pipe (LHP) capable of dissipating 1000 W. The LHP was designed for integration into a high performance aircooled heat sink to address thermal management ...

Hanks, Daniel Frank

2012-01-01T23:59:59.000Z

464

(VDL)˛ : a jitter measurement built-in self-test circuit for phase locked loops  

E-Print Network (OSTI)

This paper discusses the development of a new type of BIST circuit, the (VDL)2, with the purpose of measuring jitter in IBM's phase locked loops. The (VDL)2, which stands for Variable Vernier Digital Delay Locked Line, ...

Kam, Brandon Ray

2005-01-01T23:59:59.000Z

465

Loop current order and d-wave superconductivity: Some observable consequences  

E-Print Network (OSTI)

Loop current order has been reported in the pseudogap regime of a few cuprate systems in polarized neutron scattering experiments. Here we study several observable consequences of such order in the d-wave superconducting ...

Allais, Andrea

466

Frequency of Ring Separations from the Loop Current in the Gulf of Mexico: A Revised Estimate  

Science Conference Proceedings (OSTI)

The most energetic events in the circulation of the Gulf of Mexico are the separation of large anticyclonic rings from the Loop Current. Building on previous work, the authors examine all the apparent rings since July 1973. This new dataset ...

W. Sturges; R. Leben

2000-07-01T23:59:59.000Z

467

The Design and Qualification of a Hydraulic Hardware-in-the-Loop Simulator .  

E-Print Network (OSTI)

??The goal of this work was to design and evaluate a hydraulic Hardware-in-the-Loop (HIL) simulation system based around electric and hydraulic motors. The idea behind… (more)

Driscoll, Scott Crawford

2005-01-01T23:59:59.000Z

468

A Numerical Study of Loop Current Eddy Interaction with Topography in the Western Gulf of Mexico  

Science Conference Proceedings (OSTI)

Anticyclones originating from the Loop Current are known to propagate into the western Gulf of Mexico. Their frequency of generation, their long lifetimes, and satellite data suggest that at any one time one or more eddies may occupy the Gulf. ...

David C. Smith IV

1986-07-01T23:59:59.000Z

469

Oriented matroid theory and loop quantum gravity in (2+2) and eight dimensions  

E-Print Network (OSTI)

We establish a connection between oriented matroid theory and loop quantum gravity in (2+2) (two time and two space dimensions) and 8-dimensions. We start by observing that supersymmetry implies that the structure constants of the real numbers, complex numbers, quaternions and octonions can be identified with the chirotope concept. This means, among other things, that normed divisions algebras, which are only possible in 1,2, 4 or 8-dimensions, are linked to oriented matroid theory. Therefore, we argue that the possibility for developing loop quantum gravity in 8-dimensions must be taken as important alternative. Moreover, we show that in 4-dimensions, loop quantum gravity theories in the (1+3) or (0+4) signatures are not the only possibilities. In fact, we show that loop quantum gravity associated with the (2+2)-signature may also be an interesting physical structure.

J. A. Nieto

2010-03-24T23:59:59.000Z

470

DETAILED LOOP MODEL (DLM) ANALYSIS OF LIQUID SOLAR THERMOSIPHONS WITH HEAT EXCHANGERS  

E-Print Network (OSTI)

Eq. (18b) Dhe heat exchanger heat transfer parameter, Eq. (t1 Loop Thermosiphon Heat Exchanger,n ASHRAE Transactions,s . • Thermosiphon Heat Exchanger,n Part 2, 1980, No. 2588,

Mertol, A.

2013-01-01T23:59:59.000Z

471

Rotary bed reactor for chemical-looping combustion with carbon capture  

E-Print Network (OSTI)

Chemical-looping combustion (CLC) is a novel and promising technology for power generation with inherent CO2 capture. Currently almost all the research has been focused on developing CLC based inter-connected fluidized bed ...

Zhao, Zhenlong

2012-01-01T23:59:59.000Z

472

Geek-Up[08.27.10] -- Geothermal Stores, Graphene Loops, Nozzle...  

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

Marketing Administration Other Agencies You are here Home Geek-Up08.27.10 -- Geothermal Stores, Graphene Loops, Nozzle Technology and the 1918 El Nio Geek-Up08.27.10 --...

473

Feedback loop design and experimental testing for integrated optics with micro-mechanical tuning  

E-Print Network (OSTI)

I designed a capacitive sensor with feedback control for precision tuning of a MEMS controlled wavelength-selective switch. The implementation is based upon a customized feedback loop with a PID controller. The positional ...

Waller, Laura A. (Laura Ann)

2005-01-01T23:59:59.000Z

474

DETAILED LOOP MODEL (DLM) ANALYSIS OF LIQUID SOLAR THERMOSIPHONS WITH HEAT EXCHANGERS  

E-Print Network (OSTI)

THERMOSIPHONS WITH HEAT EXCHANGERS A. Mertol, W. Place, T.Eq. (18b) Dhe heat exchanger heat transfer parameter, Eq. (t1 Loop Thermosiphon Heat Exchanger,n ASHRAE Transactions,

Mertol, A.

2013-01-01T23:59:59.000Z

475

Development of a compensation chamber for use in a multiple condenser loop heat pipe  

E-Print Network (OSTI)

The performance of many electronic devices is presently limited by heat dissipation rates. One potential solution lies in high-performance air-cooled heat exchangers like PHUMP, the multiple condenser loop heat pipe presented ...

Roche, Nicholas Albert

2013-01-01T23:59:59.000Z

476

The periodic table of topological insulators and superconductors: the loop sequence approach  

E-Print Network (OSTI)

In this work, a complete homotopic interpretation on the periodic table of topological insulators and superconductors has been derived by establishing the loop sequence of the corresponding classifying spaces. In our approach, each classifying spaces has been regarded as a fiber bundle defined on one point, following that the loop relationship between the classifying spaces in the same symmetric class has been built and proved. Meanwhile, the loop sequence between the classifying spaces with the same spatial dimension has also been developed based on the minimal geodesic approximation. Finally, by building the loop sequence for general dimensions and symmetric classes, a complete homotopic understanding about the whole periodic table of any classifying spaces is achieved. Our approach provides a unified way to interpret the topological relationship between any free-fermion systems.

Chunbo Zhao