Powered by Deep Web Technologies
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.


1

Closing the Loop over Wireless Networks:Closing the Loop over Wireless Networks: Fundamentals and Applications  

E-Print Network [OSTI]

Wireless Networks: Fundamentals and Applications Karl H. Johansson Electrical Engineering, Royal Institute4/9/2008 1 Closing the Loop over Wireless Networks:Closing the Loop over Wireless Networks: Fundamentals and Applications Karl H. Johansson Electrical Engineering, Royal Institute of Technology Stockholm

Johansson, Karl Henrik

2

Integrated Framework toward a Closed Loop Measurement and Verification  

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

3

Closed-loop control of anesthesia in children 1 Robust closed-loop control of induction and  

E-Print Network [OSTI]

: During closed-loop control, a drug infusion is continually adjusted according to a measure of clinical. Remifentanil was administered as a bolus (0.5 g/kg), followed by continuous infusion (0.03 g/kg/min). The propofol infusion was closed-loop controlled throughout induction and maintenance of anesthesia, using

4

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

5

Energy Savings Calculator for Commercial Boilers: Closed Loop, Space  

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

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?

6

Operational Results of a Closed Brayton Cycle Test-Loop  

SciTech Connect (OSTI)

A number of space and terrestrial power system designs plan to use nuclear reactors that are coupled to Closed-loop Brayton Cycle (CBC) systems to generate electrical power. Because very little experience exists regarding the operational behavior of these systems, Sandia National Laboratories (through its Laboratory Directed Research and Development program) is developing a closed-loop test bed that can be used to determine the operational behavior of these systems and to validate models for these systems. Sandia has contracted Barber-Nichols Corporation to design, fabricate, and assemble a Closed-loop Brayton Cycle (CBC) system. This system was developed by modifying commercially available hardware. It uses a 30 kWe Capstone C-30 gas-turbine unit (www.capstoneturbine.com) with a modified housing that permits the attachment of an electrical heater and a water cooled chiller that are connected to the turbo-machinery in a closed loop. The test-loop reuses the Capstone turbine, compressor, and alternator. The Capstone system's nominal operating point is 1150 K turbine inlet temperature at 96,000 rpm. The annular recuperator and portions of the Capstone control system (inverter) and starter system are also reused. The rotational speed of the turbo-machinery is controlled either by adjusting the alternator load by either using the electrical grid or a separate load bank. This report describes the test-loop hardware SBL-30 (Sandia Brayton Loop-30kWe). Also presented are results of early testing and modeling of the unit. The SBL-30 hardware is currently configured with a heater that is limited to 80 kWth with a maximum outlet temperature of {approx}1000 K.

Wright, Steven A.; Lipinski, Ronald J.; Brown, Nicholas [Sandia National Laboratories, Org 6872 MS-1146, PO Box 5800 Albuquerque, New Mexico 87185 (United States); Fuller, Robert; Nichols, Kenneth [Barber Nichols 6325 W 55th Ave., Arvada, Colorado 80002 (United States)

2005-02-06T23:59:59.000Z

7

"Closed-loop" analysis of a thermo-charged capacitor  

E-Print Network [OSTI]

In this Letter, an explicit application of conservation of energy and zero net work principle around a closed path ("closed-loop" analysis) is carried out on a thermo-charged capacitor at equilibrium with ambient heat at uniform temperature. This analysis corroborates the results of previous studies [Phys.Lett.A 374 (2010) 1801, Physica A 390 (2011) 481] that a potential drop $\\Delta V$ does actually occur at capacitor terminals.

Germano D'Abramo

2014-05-02T23:59:59.000Z

8

An Innovative Pressure Sensor Glow Plug Offers Improved Diesel Engine Closed-loop Control  

Broader source: Energy.gov [DOE]

Describes glow plug with integrated pressure sensor for closed-loop control of diesel engine combustion

9

A Scheme-Based Closed-Loop Anesthesia System  

Science Journals Connector (OSTI)

Many aspects of modern medicine, including the administration of anesthetic agents during general surgery, remain unautomated and reliant on the vigilance of the attending clinicians. In other fields where failures can have catastrophic consequences, ... Keywords: Scheme, anesthesia, application programming, closed-loop control, cross-platform development, functional programming, medical systems

C. L. Petersen, M. Görges, J. M. Ansermino, G. A. Dumont

2014-08-01T23:59:59.000Z

10

A new closed loop control method for HVDC transmission  

SciTech Connect (OSTI)

The paper presents a new closed loop control method which uses information locally available at each converter station and combines and coordinates control possibilities with the objective of improving the dynamic behavior during fault recoveries and disturbances around the operating points.

Karlecik-Maier, F. [Siemens AG, Erlangen (Germany)] [Siemens AG, Erlangen (Germany)

1996-10-01T23:59:59.000Z

11

Heliostat System with Wireless Closed-Loop Control  

Broader source: Energy.gov [DOE]

This fact sheet summarizes a SunShot Initiative project led by Thermata to develop and demonstrate the first practical heliostat to use closed-loop tracking that can optically sense and control the reflected sunlight beam at the target. The expected benefits of this system include the reduction in the total installed cost of the heliostat field in a power tower concentrating solar power project.

12

Closed-loop auditory-based representation for robust speech recognition  

E-Print Network [OSTI]

A closed-loop auditory based speech feature extraction algorithm is presented to address the problem of unseen noise for robust speech recognition. This closed-loop model is inspired by the possible role of the medial ...

Lee, Chia-ying, S.M. Massachusetts Institute of Technology

2010-01-01T23:59:59.000Z

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.

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

1998-01-01T23:59:59.000Z

14

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

15

SunShot Initiative: Heliostat System with Wireless Closed-Loop Control  

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

16

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

17

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

E-Print Network [OSTI]

ity expansion problem in liberalized electricity markets. The first is an open loop equilibrium model, where generation companies simultaneously choose.

2012-05-06T23:59:59.000Z

18

ORC Closed Loop Control Systems for Transient and Steady State Duty Cycles  

Broader source: Energy.gov [DOE]

System-level models using iterative concept analysis are being used on a closed loop controlled, waste heat recovery system running automatically over various drive cycles.

19

A study of the augmented Lagrangian method for open loop and closed loop constrained multibody dynamic systems  

E-Print Network [OSTI]

The primary objective of this thesis is to study the augmented Lagrangian method for open and closed loop constrained multibody dynamic systems. Much research has been carried out for the performance of the augmented Lagrangian formulation for open...

Webb, Glenn Viktor

2012-06-07T23:59:59.000Z

20

On Hybrid Systems and Closed-Loop MPC Systems A. Bemporad1  

E-Print Network [OSTI]

On Hybrid Systems and Closed-Loop MPC Systems A. Bemporad1 , W.P.M.H. Heemels2 , B. De Schutter3 Abstract The following five classes of hybrid systems were re- cently proved to be equivalent: linear- per, for linear or hybrid plants in closed-loop with a model predictive control (MPC) controller based

Sontag, Eduardo

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

Tonal Noise Excited by Plasma in Cylinder Wakes Using Closed-loop Control  

E-Print Network [OSTI]

atmosphere uniform glow discharge surface plasma," IEEE International Conference on Plasma Science, IEEETonal Noise Excited by Plasma in Cylinder Wakes Using Closed-loop Control Wenjun Yu , and Xun Huang controlled by a closed-loop plasma control system was demonstrated in this work. The flow around a cylinder

Huang, Xun

22

Dell, Inc.'s closed loop supply chain for computer assembly plants  

Science Journals Connector (OSTI)

Many authors and researchers cite Dell's supply chain as a model of excellence, yet few look at the entire closed-loop supply chain and the prevalent inventory and logistics techniques that enable this complex process to work. The techniques reviewed ... Keywords: Dell, Inc. closed-loop supply chains, demand management, forward supply chains, modularity, postponement, reverse supply chains, vendor managed inventory

Sameer Kumar; Sarah Craig

2007-08-01T23:59:59.000Z

23

Numeric simulation of thyristor power converters taking into consideration the firing-circuits and the closed-loop control  

E-Print Network [OSTI]

Numeric simulation of thyristor power converters taking into consideration the firing-circuits and the closed-loop control

Bordry, Frederick; Proudlock, Paul

1988-01-01T23:59:59.000Z

24

New Developments in Closed Loop Combustion Control Using Flue Gas Analysis  

E-Print Network [OSTI]

New developments in closed loop combustion control are causing radical changes in the way combustion control systems are implemented. The recent availability of in line flue gas analyzers and microprocessor technology are teaming up to produce...

Nelson, R. L.

1981-01-01T23:59:59.000Z

25

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

26

MPCI: the capabilities of closed loop process identification by establishing a new paradigm  

E-Print Network [OSTI]

Model predictive control and identification (MPCI) is a new class of adaptive controllers, that employ the following on-line optimization to perform closed-loop identification and controller adaptation : at each time step minimize an objective...

Eker, Sukru Alper

1998-01-01T23:59:59.000Z

27

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...

Wege, P. M.

1981-01-01T23:59:59.000Z

28

A 25m2 Target-Aligned Heliostat with Closed-Loop Control  

Science Journals Connector (OSTI)

A 25m2 target-aligned research heliostat with closed-loop control, with a theoretical ... built at CSIR in South Africa. The heliostat has four degrees of freedom: Azimuth,...2 target-aligned miniheliostat. A tra...

Thomas Roos; Ndumiso Zwane; Eu’odia Kruger…

2009-01-01T23:59:59.000Z

29

An expert fuzzy rule-based system for closed-loop supply chain performance assessment in the automotive industry  

Science Journals Connector (OSTI)

Closed-loop supply chain management has been identified as an efficient, effective and economical strategy towards environmental sustainable practices in manufacturing companies. Without a formidable closed-loop supply chain to complement green supply ... Keywords: Closed-loop supply chain, Fuzzy logic, Green supply chain, Performance measurement, Rule-based system

Ezutah Udoncy Olugu; Kuan Yew Wong

2012-01-01T23:59:59.000Z

30

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.

31

Power Generating Stationary Engines Nox Control: A Closed Loop...  

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

A Low-Cost Continuous Emissions Monitoring System for Mobile and Stationary Engine SCRDPF ApplicationsData-Logger for Vehicle Data Acquisition Active DPF for Off-Road...

32

Closed-loop Real-time Control of a Novel Linear Magnetostrictive Actuator  

E-Print Network [OSTI]

................................................................................................................ 88 APPENDIX A SIMULINK? BLOCK DIAGRAMS ..................................................... 92 VITA ............................................................................................................................... 99 x LIST... to 1.5 A ........... 39 3.9. Bode-plot for the transfer function (3.4) .................................................................. 40 3.10. Schematic diagram of the overall closed-loop system ........................................ 41 3...

Chen, Chien-Fan

2010-10-12T23:59:59.000Z

33

STEP-NC enabled on-line inspection in support of closed-loop machining  

Science Journals Connector (OSTI)

The object-oriented STEP-NC data model provides a seamless and integrated programming interface for on-machine (or also known as on-line or in-line) inspections as well as interoperable manufacturing. This paper proposes a STEP-NC data model for on-line ... Keywords: Closed-loop machining, Machining, On-machine inspection, STEP-NC

Fiona Zhao; Xun Xu; Shane Xie

2008-04-01T23:59:59.000Z

34

Design of active loops for magnetic field mitigation in MV/LV substation surroundings  

Science Journals Connector (OSTI)

Abstract This paper deals with the application and optimization of active loops for the mitigation of the magnetic field generated by complex sources, especially MV/LV substations. Various active-loop configurations are proposed, which are analyzed in several regions located close to a particular MV/LV substation, and the optimum geometry and location of the loops are obtained together with the optimum current (magnitude and phase) to be injected into the loops. All this is performed by means of a genetic algorithm in order to reduce the average magnetic field inside the target volume (inspection volume) to the minimum. The performance of the proposed active loops is compared with that obtained via other well-known mitigation technique, such as conductive/ferromagnetic passive shields. The main results are analyzed, and the differences, in terms of performance, between the two shielding techniques, and their proper application to MV/LV substations, are highlighted.

Juan Carlos del-Pino-López; Luca Giaccone; Aldo Canova; Pedro Cruz-Romero

2015-01-01T23:59:59.000Z

35

Reverse logistics and closed-loop supply chain: A comprehensive review to explore the future  

Science Journals Connector (OSTI)

Abstract Based on environmental, legal, social, and economic factors, reverse logistics and closed-loop supply chain issues have attracted attention among both academia and practitioners. This attention is evident by the vast number of publications in scientific journals which have been published in recent years. Hence, a comprehensive literature review of recent and state-of-the-art papers is vital to draw a framework of the past, and to shed light on future directions. The aim of this paper is to review recently published papers in reverse logistic and closed-loop supply chain in scientific journals. A total of 382 papers published between January 2007 and March 2013 are selected and reviewed. The papers are then analyzed and categorized to construct a useful foundation of past research. Finally, gaps in the literature are identified to clarify and to suggest future research opportunities.

Kannan Govindan; Hamed Soleimani; Devika Kannan

2015-01-01T23:59:59.000Z

36

Leveraging a Cohesive Supply Chain to Close the Loop on EPS Packaging  

E-Print Network [OSTI]

Leveraging a Cohesive Supply Chain to Close the Loop on EPS Packaging Katherine Hang, UC San Diego Carbon Conversion Guide #12;1.09 2.08 0.97 0.0 0.5 1.0 1.5 2.0 2.5L Amber Glass 7L Returnable Stainless Filling Packaging Distribution Collection Cleaning Disposal Mail-back Carbon Footprint Results Steel

Russell, Lynn

37

Estimation of nitrous oxide emissions (GHG) from wastewater treatment plants using closed-loop mass balance and data reconciliation  

Science Journals Connector (OSTI)

The amount of greenhouse gases (GHG), especially, nitrous oxide (N2O) emitted from wastewater treatment plants (WWTP) using data reconciliation and closed-loop mass balance was estimated. This study is based on a...

JungJin Lim; Boddupalli Sankarrao; TaeSeok Oh…

2012-09-01T23:59:59.000Z

38

Decomposition Based Solution Approaches for Multi-product Closed-Loop Supply Chain Network Design Models  

E-Print Network [OSTI]

to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Approved by: Co-Chairs of Committee, S?la C?etinkaya Halit ?Uster Committee Members, Elif Ak?cal? Brett Peters Jennifer L....E., PSG College of Technology, Coimbatore, India; M.S., Texas A&M University Co?Chairs of Advisory Committee: Dr. S?la C?etinkaya Dr. Halit ?Uster Closed-loop supply chain (CLSC) management provides opportunity for cost savings through the integration...

Easwaran, Gopalakrishnan

2010-01-16T23:59:59.000Z

39

Closed Loop Speed Control of Induction Generator with Scalar-control Inverters  

Science Journals Connector (OSTI)

Abstract A closed loop speed control for an induction generator is presented. The system was developed for a space vector modulation-voltage source inverter and the three-phase squirrel-cage induction generator to regulate speed and generator voltages with scalar control technique. The aim of this research was to a generated voltage with a constant speed at variable mechanical torque of prime mover. The simulation results show a good performance of the system can be achieved by the proposed speed controller.

Anaphat Upasan; Yuttana Kumsuwan

2013-01-01T23:59:59.000Z

40

Nonlinear Effects in Pulse Propagation through Doppler-Broadened Closed-Loop Atomic Media  

E-Print Network [OSTI]

Nonlinear effects in pulse propagation through a medium consisting of four-level double-$\\Lambda$-type systems are studied theoretically. We apply three continous-wave driving fields and a pulsed probe field such that they form a closed interaction loop. Due to the closed loop and the finite frequency width of the probe pulses the multiphoton resonance condition cannot be fulfilled, such that a time-dependent analysis is required. By identifying the different underlying physical processes we determine the parts of the solution relevant to calculate the linear and nonlinear response of the system. We find that the system can exhibit a strong intensity dependent refractive index with small absorption over a range of several natural linewidths. For a realistic example we include Doppler and pressure broadening and calculate the nonlinear selfphase modulation in a gas cell with Sodium vapor and Argon buffer gas. We find that a selfphase modulation of $\\pi$ is achieved after a propagation of few centimeters through the medium while the absorption in the corresponding spectral range is small.

Robert Fleischhaker; Jörg Evers

2007-11-26T23:59:59.000Z

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

Economic evaluation of long-distance hydrogen transmission by chemical closed-loop cycle  

Science Journals Connector (OSTI)

All over the world there are enormous unexploited renewable energy reserves (hydro, geothermic, solar, wind, etc.). Most originate far from the location of the users, so their exploitation would greatly benefit from the disclosure of new, more economical, and technically feasible transmission systems. A possible alternative to electricity is the use of hydrogen as a medium for transportation of energy. This work proposes a chemical closed-loop cycle based upon catalytic reversible reactions as a means to transmit hydrogen. A real example for the application of the proposed system for transportation of secondary energy was considered. In particular, choosing a large hydro-electric source as reference, a comparison was made between costs and efficiencies in transferring energy as hydrogen (in its different forms) over long distances, with respect to transportation of the same energy as electricity.

G. Cacciola; V. Recupero; N. Giordano

1985-01-01T23:59:59.000Z

42

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":""}]}

43

Closed-loop control of a SCR system using a NOx sensor cross-sensitive to NH3  

E-Print Network [OSTI]

Closed-loop control of a SCR system using a NOx sensor cross-sensitive to NH3 A.Bonfils , Y. Creff for an automotive selective catalytic reduction (SCR) system, for which the feedback is based on a NOx sensor the variety of en- countered technologies, selective catalytic reduction (SCR) is one of the most appealing

44

Resource Conservative Manufacturing Transforming Waste into High Value Resource through Closed-Loop Product Systems (ResCoM)  

E-Print Network [OSTI]

with a materials information module. The platform will help guide design decisions by illustrating the benefits in account the complex, dynamic interaction between product design (design for multiple product lifecycles), supply chain management (integrated supply chains), business model development (closed-loop business

Arleo, Angelo

45

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

E-Print Network [OSTI]

Integrated Framework toward a Closed Loop Measurement and Verification Approach Shankar Earni, Phil of measurement and verification (M&V) plans from federal ESPC projects to understand and assess the overall) to meet or exceed facility performance requirements, such as lighting and temperature levels. Measurement

46

On-board Velocity Estimation and Closed-loop Control of a Quadrotor UAV based on Optical Flow  

E-Print Network [OSTI]

On-board Velocity Estimation and Closed-loop Control of a Quadrotor UAV based on Optical Flow an efficient fall back routine for any kind of UAV (Unmanned Aerial Vehicles) since we rely solely. The results show that our approach is able to recover the ego-motion of a flying UAV in realistic conditions

47

Linear motor drive system for continuous-path closed-loop position control of an object  

DOE Patents [OSTI]

A precision numerical controlled servo-positioning system is provided for continuous closed-loop position control of a machine slide or platform driven by a linear-induction motor. The system utilizes filtered velocity feedback to provide system stability required to operate with a system gain of 100 inches/minute/0.001 inch of following error. The filtered velocity feedback signal is derived from the position output signals of a laser interferometer utilized to monitor the movement of the slide. Air-bearing slides mounted to a stable support are utilized to minimize friction and small irregularities in the slideway which would tend to introduce positioning errors. A microprocessor is programmed to read command and feedback information and converts this information into the system following error signal. This error signal is summed with the negative filtered velocity feedback signal at the input of a servo amplifier whose output serves as the drive power signal to the linear motor position control coil.

Barkman, William E. (Oak Ridge, TN)

1980-01-01T23:59:59.000Z

48

ICFT- An Initial Closed-Loop Flow Test of the Fenton Hill Phase...  

Open Energy Info (EERE)

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 msup 3 of cold...

49

Development of a non-linear closed-loop control system for intracranial pressure regulation  

E-Print Network [OSTI]

was developed and simulated using Matlab-Simulink. The simulations were useful in predicting the experimental results and also helped in explaining problems faced with the apparatus. The experimental data collected for static and dynamic tests were close... was developed and simulated using Matlab-Simulink. The simulations were useful in predicting the experimental results and also helped in explaining problems faced with the apparatus. The experimental data collected for static and dynamic tests were close...

Durai, Richard

2012-06-07T23:59:59.000Z

50

Steelcase Closed Loop Energy Recovery System - What We Have Learned With Our Operation  

E-Print Network [OSTI]

, the industrial recession indicates no immediate supply/ demand problem. However, international turmoil, domestic price control, politics or a severe winter, coupled with economic recovery could cause area or specific fuel shortages. The experiences of land... success: A. Incinerator operators B. Type "0" material handling C. Preventative maintenance D. Incinerator supervision E. Combustion process F. Support utilities G. Ash conveyor Priority 2 Factors which require consistent review and periodic close...

Dornbos, D. L., Sr.

1983-01-01T23:59:59.000Z

51

Hardware-in-the-loop simulation of an active-adaptive power grid  

Science Journals Connector (OSTI)

The article deals with hardware-in-the-loop simulation of active-adaptive power grids that are complicated integrated energy-generating and...

A. B. Petrochenkov; T. Frank; A. V. Romodin…

2013-11-01T23:59:59.000Z

52

Ilmenite Activation during Consecutive Redox Cycles in Chemical-Looping Combustion  

Science Journals Connector (OSTI)

Ilmenite Activation during Consecutive Redox Cycles in Chemical-Looping Combustion ... Industrial & Engineering Chemistry Research2014 53 (42), 16341-16348 ...

Juan Adánez; Ana Cuadrat; Alberto Abad; Pilar Gayán; Luis F. de Diego; Francisco García-Labiano

2010-01-07T23:59:59.000Z

53

A Simple Algorithm for Closed-Loop Control of Stepping Motors IEE Proc. -Electr. Power Appl., (1995) Vol 142, No 1, pp 5-13.  

E-Print Network [OSTI]

A Simple Algorithm for Closed-Loop Control of Stepping Motors IEE Proc. - Electr. Power Appl of Reading Whiteknights PO Box 225 Reading RG6 2AY ABSTRACT Stepping motors are normally operated without feedback. A simple control algorithm is developed which allows a stepping motor to operate effectively

Grimbleby, James

54

Multi-nozzle array spray cooling for large area high power devices in a closed loop system  

Science Journals Connector (OSTI)

Abstract A prototype of a closed loop system was built to study multi-nozzle array spray cooling on high-power, large-area electronic devices. Fifty-four nozzles with an in-lined array of 9 × 6 were applied to spray cool a simulated 6U electronic card using R134a. Simple drainage concepts were introduced to assist the drainage of both liquid and vapour on the heated surface. The results indicated a promising prospect of using a multi-nozzle array on large-area power electronics cooling. 16 kW heat was removed from the 6U card area by maintaining the mean surface temperature below 26.5  ° C . Heat transfer coefficient up to 2.8  × 10 4 W / m 2 K was obtained, and liquid usage fraction as high as 0.88 was achieved before CHF occurred. It was found that increasing nozzle pressure drop or flow rate enhanced heat transfer and gave better surface temperature uniformity. Chamber pressure significantly influenced mean surface temperature, but had no observable effects on surface temperature uniformity. The control of chamber pressure can maintain a constant temperature on the heated surface when heat load varied largely. The results also showed that the spray-to-spray interactions had inconspicuous effects on local surface temperatures but rather the distance from a location relative to the drainage outlets.

J.L. Xie; Y.B. Tan; T.N. Wong; F. Duan; K.C. Toh; K.F. Choo; P.K. Chan; Y.S. Chua

2014-01-01T23:59:59.000Z

55

Solar Flare Activity Closely Monitored | Department of Energy  

Energy Savers [EERE]

Closely Monitored September 11, 2014 - 5:30pm Addthis Dr. Ken Friedman Senior Policy Advisor in the Office of Electricity Delivery and Energy Reliability The National Oceanic and...

56

Heat transfer rate of a closed-loop oscillating heat pipe with check valves using silver nanofluid as working fluid  

Science Journals Connector (OSTI)

This research investigated the effect of aspect ratios (evaporator length to inner diameter of capillary tube), inclination angles, and concentrations of silver nanofluid on the heat transfer rate of a closed-loo...

S. Wannapakhe; S. Rittidech; B. Bubphachot…

2009-06-01T23:59:59.000Z

57

Verifiable Active Safety for Automotive Cyber-Physical Systems with Humans in the Loop  

E-Print Network [OSTI]

-6925 A recent trend in the automotive industry is the rapid inclusion of electronics, computers and controlsVerifiable Active Safety for Automotive Cyber-Physical Systems with Humans in the Loop Francesco that focus entirely on improved functionality and overall system robustness. This makes the automotive sector

Rajkumar, Ragunathan "Raj"

58

Code loops in both parities  

Science Journals Connector (OSTI)

We present equivalent definitions of code loops in any characteristic p?0. The most natural definition is via combinatorial polarization, but we also show how to realize code loops by linear codes and as a class of symplectic conjugacy ... Keywords: Characteristic form, Code loop, Combinatorial polarization, Conjugacy closed loop, Doubly even code, Even code loop, Kronecker product, Moufang loop, Odd code loop, Self-orthogonal code, Small Frattini loop, Symmetric associator, Symplectic loop

Aleš Drápal; Petr Vojt?chovský

2010-06-01T23:59:59.000Z

59

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

60

Yosemite Closing the Loop Project  

E-Print Network [OSTI]

involved in producing fossil fuels. Life-cycle analyses thatinvolved in producing fossil fuels. Life cycle analyses thatthe processes that produce fossil fuels. Life cycle analyses

Durbin, T

2005-01-01T23:59:59.000Z

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.


61

Critical Role of Magnesium Ions in DNA Polymerase 's Closing and Active Site Assembly  

E-Print Network [OSTI]

Critical Role of Magnesium Ions in DNA Polymerase 's Closing and Active Site Assembly Linjing Yang nucleotide with conserved catalytic residues (Asp190, Asp192, Asp256) and the two functional magnesium ions adjustments of the nucleotide-binding and catalytic magnesium ions help guide polymerase selection

Schlick, Tamar

62

A solar active region loop compared with a 2D MHD model  

E-Print Network [OSTI]

We analyzed a coronal loop observed with the Normal Incidence Spectrometer (NIS), which is part of the Coronal Diagnostic Spectrometer (CDS) on board the Solar and Heliospheric Observatory (SOHO). The measured Doppler shifts and proper motions along the selected loop strongly indicate unidirectional flows. Analysing the Emission Measure Curves of the observed spectral lines, we estimated that the temperature along the loop was about 380000 K. We adapted a solution of the ideal MHD steady equations to our set of measurements. The derived energy balance along the loop, as well as the advantages/disadvantages of this MHD model for understanding the characteristics of solar coronal loops are discussed.

Gontikakis, C; Dara, H C; Tsinganos, K

2005-01-01T23:59:59.000Z

63

A solar active region loop compared with a 2D MHD model  

E-Print Network [OSTI]

We analyzed a coronal loop observed with the Normal Incidence Spectrometer (NIS), which is part of the Coronal Diagnostic Spectrometer (CDS) on board the Solar and Heliospheric Observatory (SOHO). The measured Doppler shifts and proper motions along the selected loop strongly indicate unidirectional flows. Analysing the Emission Measure Curves of the observed spectral lines, we estimated that the temperature along the loop was about 380000 K. We adapted a solution of the ideal MHD steady equations to our set of measurements. The derived energy balance along the loop, as well as the advantages/disadvantages of this MHD model for understanding the characteristics of solar coronal loops are discussed.

C. Gontikakis; G. J. D. Petrie; H. C. Dara; K. Tsinganos

2005-03-31T23:59:59.000Z

64

SDO/AIA AND HINODE/EIS OBSERVATIONS OF INTERACTION BETWEEN AN EUV WAVE AND ACTIVE REGION LOOPS  

SciTech Connect (OSTI)

We present detailed analysis of an extreme-ultraviolet (EUV) wave and its interaction with active region (AR) loops observed by the Solar Dynamics Observatory/Atmospheric Imaging Assembly and the Hinode EUV Imaging Spectrometer (EIS). This wave was initiated from AR 11261 on 2011 August 4 and propagated at velocities of 430-910 km s{sup –1}. It was observed to traverse another AR and cross over a filament channel on its path. The EUV wave perturbed neighboring AR loops and excited a disturbance that propagated toward the footpoints of these loops. EIS observations of AR loops revealed that at the time of the wave transit, the original redshift increased by about 3 km s{sup –1}, while the original blueshift decreased slightly. After the wave transit, these changes were reversed. When the EUV wave arrived at the boundary of a polar coronal hole, two reflected waves were successively produced and part of them propagated above the solar limb. The first reflected wave above the solar limb encountered a large-scale loop system on its path, and a secondary wave rapidly emerged 144 Mm ahead of it at a higher speed. These findings can be explained in the framework of a fast-mode magnetosonic wave interpretation for EUV waves, in which observed EUV waves are generated by expanding coronal mass ejections.

Yang, Liheng; Zhang, Jun; Li, Ting [Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China); Liu, Wei [W. W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305 (United States); Shen, Yuandeng, E-mail: yangliheng@bao.ac.cn, E-mail: zjun@bao.ac.cn, E-mail: liting@bao.ac.cn [Kwasan and Hida Observatories, Kyoto University, Kyoto 607-8471 (Japan)

2013-09-20T23:59:59.000Z

65

Crystal Structures of Trypanosoma cruzi UDP-Galactopyranose Mutase Implicate Flexibility of the Histidine Loop in Enzyme Activation  

SciTech Connect (OSTI)

Chagas disease is a neglected tropical disease caused by the protozoan parasite Trypanosoma cruzi. Here we report crystal structures of the galactofuranose biosynthetic enzyme UDP-galactopyranose mutase (UGM) from T. cruzi, which are the first structures of this enzyme from a protozoan parasite. UGM is an attractive target for drug design because galactofuranose is absent in humans but is an essential component of key glycoproteins and glycolipids in trypanosomatids. Analysis of the enzyme-UDP noncovalent interactions and sequence alignments suggests that substrate recognition is exquisitely conserved among eukaryotic UGMs and distinct from that of bacterial UGMs. This observation has implications for inhibitor design. Activation of the enzyme via reduction of the FAD induces profound conformational changes, including a 2.3 {angstrom} movement of the histidine loop (Gly60-Gly61-His62), rotation and protonation of the imidazole of His62, and cooperative movement of residues located on the si face of the FAD. Interestingly, these changes are substantially different from those described for Aspergillus fumigatus UGM, which is 45% identical to T. cruzi UGM. The importance of Gly61 and His62 for enzymatic activity was studied with the site-directed mutant enzymes G61A, G61P, and H62A. These mutations lower the catalytic efficiency by factors of 10-50, primarily by decreasing k{sub cat}. Considered together, the structural, kinetic, and sequence data suggest that the middle Gly of the histidine loop imparts flexibility that is essential for activation of eukaryotic UGMs. Our results provide new information about UGM biochemistry and suggest a unified strategy for designing inhibitors of UGMs from the eukaryotic pathogens.

Dhatwalia, Richa; Singh, Harkewal; Oppenheimer, Michelle; Sobrado, Pablo; Tanner, John J. (Virginia Tech); (UMC)

2012-11-01T23:59:59.000Z

66

Cascading Closed Loop Cycle Power Generation  

E-Print Network [OSTI]

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...

Romero, M.

2008-01-01T23:59:59.000Z

67

Used oil recycling: Closing the loop  

SciTech Connect (OSTI)

This paper provides an overview of the recycling and re-refining of used oil. Recommended best management practices to encourage the safe management, collection, recovery and purchasing of this resource are identified. Management practices address handling, separating, and specifications. Other topics outlined include collection methods, market research, state studies and programs, environmental and economic factors of recycling, re-refining, and oil filters. References, studies, regulations, and other sources of information are noted in the bibliography.

Arner, R. [Northern Virginia Planning District Commission, Annandale, VA (United States)

1996-08-01T23:59:59.000Z

68

The HTGR Closed - Loop Energy System  

E-Print Network [OSTI]

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...

Leeth, G. G.

1981-01-01T23:59:59.000Z

69

Close-spaced thermionic converters with active spacing control and heat-pipe isothermal emitters  

SciTech Connect (OSTI)

Thermionic converters with interelectrode gaps smaller than 10 microns are capable of substantial performance improvements over conventional ignited mode diodes. Previous devices which have demonstrated operation at such small gaps have done so at low power densities and emitter temperatures. Higher power operation requires overcoming two primary design issues: thermal distortion of the emitter due to temperature gradients and degradation of the in-gap spacers at higher emitter temperatures. This work describes two innovations for solution of these issues. The issue of thermal distortion was addressed by an isothermal emitter incorporating a heat-pipe into its structure. Such a heat-pipe emitter, with a single-crystal emitting surface, was fabricated and characterized. Finite-element computational modeling was used to analyze its distortion with an applied heat flux. The calculations suggested that thermal distortion would be significantly reduced as compared with a solid emitter. Ongoing work and preliminary experimental results are described for a system of active interelectrode gap control. In the present design an integral transducer determines the interelectrode gap of the converter. Initial designs for spacing actuators and their required cesium vapor seals are discussed. A novel hot-shell converter design incorporating active spacing control and low-temperature seals is presented. A converter incorporating the above features would be capable of near ideal-converter performance at high power densities. In addition, active spacing control can potentially completely eliminate short-circuit failures in thermionic converter systems.

Fitzpatrick, G.O.; Koester, J.K.; Chang, J.; Britt, E.J.; McVey, J.B. [Space Power, Inc., San Jose, CA (United States)

1996-12-31T23:59:59.000Z

70

OBSERVATION OF HIGH-SPEED OUTFLOWS IN CORONAL LOOPS ASSOCIATED WITH PHOTOSPHERIC MAGNETIC FIELD EVOLUTION  

SciTech Connect (OSTI)

Using SDO/AIA instruments, we provide an EUV observation of two adjacent loop strands (Loops 1 and 2) with one side of their footpoints rooted in the boundaries of active region (AR) NOAA 11158 and the other side in the quiet-Sun regions. The AR footpoints of Loop 1 were located in monopolar magnetic areas and those of Loop 2 in mixed polar areas (SDO/HMI magnetograms). There were no apparent outflows found in Loop 1 in 10 hr of observations, whereas in Loop 2, the outflows were detected throughout the whole observation with an average speed of 120-150 km s{sup -1}. We find clear evidence of magnetic reconnections occurring in the AR footpoints of Loop 2 (the opposite magnetic polarities came close and then a part of them disappeared) and magnetic flux dispersal in the quiet-Sun footpoints (a patch of positive polarities decayed with time). Furthermore, with Hinode/SOT observations, there were no significant Ca II H brightenings detected at the loop footpoints of Loop 2 at the chromospheric heights in response to those of the AIA 171 A and 304 A channels when four strong outflow events took place in the loops, which seem to differ from the conclusions of previous studies. In other studies, the rapid coronal outflows along the coronal loops were found to originate from the chromosphere through transient events (e.g., type II spicules).

Su, J. T.; Liu, S.; Mao, X. J. [Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Science, Beijing 100012 (China); Liu, Y.; Shen, Y. D. [National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011 (China)

2012-11-20T23:59:59.000Z

71

Gas Foil Bearing Technology Advancements for Closed Brayton Cycle Turbines  

Science Journals Connector (OSTI)

Closed Brayton Cycle (CBC) turbine systems are under consideration for future space electric power generation. CBC turbines convert thermal energy from a nuclear reactor or other heat source to electrical power using a closed?loop cycle. The operating fluid in the closed?loop is commonly a high pressure inert gas mixture that cannot tolerate contamination. One source of potential contamination in a system such as this is the lubricant used in the turbomachine bearings. Gas Foil Bearings (GFB) represent a bearing technology that eliminates the possibility of contamination by using the working fluid as the lubricant. Thus foil bearings are well suited to application in space power CBC turbine systems. NASA Glenn Research Center is actively researching GFB technology for use in these CBC power turbines. A power loss model has been developed and the effects of very high ambient pressure start?up torque and misalignment have been observed and are reported here.

Samuel A. Howard; Robert J. Bruckner; Christopher DellaCorte; Kevin C. Radil

2007-01-01T23:59:59.000Z

72

Loop-to-loop coupling.  

SciTech Connect (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

73

Closing Remarks  

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

Closing Remarks 1 Next Steps * RFI: framing document posted for comment * Future workshops - July 24-25: workshop on electric drive components (Chicago, IL) - July 26: workshop on...

74

Cosmic String Loop Microlensing  

E-Print Network [OSTI]

Cosmic superstring loops within the galaxy microlens background point sources lying close to the observer-string line of sight. For suitable alignments, multiple paths coexist and the (achromatic) flux enhancement is a factor of two. We explore this unique type of lensing by numerically solving for geodesics that extend from source to observer as they pass near an oscillating string. We characterize the duration of the flux doubling and the scale of the image splitting. We probe and confirm the existence of a variety of fundamental effects predicted from previous analyses of the static infinite straight string: the deficit angle, the Kaiser-Stebbins effect, and the scale of the impact parameter required to produce microlensing. Our quantitative results for dynamical loops vary by O(1) factors with respect to estimates based on infinite straight strings for a given impact parameter. A number of new features are identified in the computed microlensing solutions. Our results suggest that optical microlensing can offer a new and potentially powerful methodology for searches for superstring loop relics of the inflationary era.

Jolyon K. Bloomfield; David F. Chernoff

2013-11-27T23:59:59.000Z

75

REFINED RFP LOOP VOLTAGE CALCULATION J.C. Sprott  

E-Print Network [OSTI]

is the stored magnetic energy, Up is the plasma energy, and 'E is the global energy confinement time, which-of-merit for RFP devices is the loop voltage. Low loop voltage implies high plasma temperature and long energy is smallest if the loop is as close to the outside of the shell and as far from the primary windings

Sprott, Julien Clinton

76

Acceleration of electric current-carrying string loop near a Schwarzschild black hole immersed in an asymptotically uniform magnetic field  

E-Print Network [OSTI]

We study the acceleration of an electric current-carrying and axially-symmetric string loop initially oscillating in the vicinity of a Schwarzschild black hole embedded in an external asymptotically uniform magnetic field. The plane of the string loop is orthogonal to the magnetic field lines and the acceleration of the string loop occurs due to the transmutation effect turning in the deep gravitational field the internal energy of the oscillating strings to the energy of their translational motion along the axis given by the symmetry of the black hole spacetime and the magnetic field. We restrict our attention to the motion of string loop with energy high enough, when it can overcome the gravitational attraction and escape to infinity. We demonstrate that for the current-carrying string loop the transmutation effect is enhanced by the contribution of the interaction between the electric current of the string loop and the external magnetic field and we give conditions that have to be fulfilled for an efficient acceleration. The Schwarzschild black hole combined with the strong external magnetic field can accelerate the current-carrying string loop up to the velocities close to the speed of light $v \\sim c$. Therefore, the string loop transmutation effect can potentially well serve as an explanation for acceleration of highly relativistic jets observed in microquasars and active galactic nuclei.

Arman Tursunov; Martin Kološ; Zden?k Stuchlík; Bobomurat Ahmedov

2014-09-16T23:59:59.000Z

77

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

78

A loop of SU(2) gauge fields stable under the Yang-Mills flow  

E-Print Network [OSTI]

A loop of SU(2) gauge fields stable under the Yang-Mills flow Daniel Friedan Department of Physics The gradient flow of the Yang-Mills action acts pointwise on closed loops of gauge fields. We construct in perturbations of the loop. The stable loop might play a role in physics as a classical winding mode

Friedan, Daniel

79

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

80

Practical Experiences from the USE of a Method for Active Functional Tests and Optimization of Coil Energy Recovery Loop Systems in AHUs  

E-Print Network [OSTI]

recovery in this kind of systems is often much lower than expected. The main reason for the poor efficiency is wrong ?fluid? flow in the recovery loop. The efficiency can in many cases be raised from about 35 % up to 60%. The ratio of the heat capacity... for an explicit description of the equations Coil energy recovery loop T_fi Cf T_tu T_ti Ct T_fu T_wc Cr Figure 3. Heat recovery loop _w=fluid _f=exhaust air _t=supply air T_ti=out door air temperature T_tu=supply air temperature after heat...

Eriksson, J.

2004-01-01T23:59:59.000Z

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.


81

Chemical Looping Combustion  

Science Journals Connector (OSTI)

Chemical looping combustion (CLC) and looping cycles in general represent an important new ... technologies, which can be deployed for direct combustion as well as be used in gasification...2...stream suitable fo...

Edward John (Ben) Anthony

2012-01-01T23:59:59.000Z

82

Grain boundary loops in graphene  

Science Journals Connector (OSTI)

Topological defects can affect the physical properties of graphene in unexpected ways. Harnessing their influence may lead to enhanced control of both material strength and electrical properties. Here we present a class of topological defects in graphene composed of a rotating sequence of dislocations that close on themselves, forming grain boundary loops that either conserve the number of atoms in the hexagonal lattice or accommodate vacancy or interstitial reconstruction, while leaving no unsatisfied bonds. One grain boundary loop is observed as a “flower” pattern in scanning tunneling microscopy studies of epitaxial graphene grown on SiC(0001). We show that the flower defect has the lowest energy per dislocation core of any known topological defect in graphene, providing a natural explanation for its growth via the coalescence of mobile dislocations.

Eric Cockayne; Gregory M. Rutter; Nathan P. Guisinger; Jason N. Crain; Phillip N. First; Joseph A. Stroscio

2011-05-12T23:59:59.000Z

83

The role of loop stacking in the dynamics of DNA hairpin formation  

E-Print Network [OSTI]

We study the dynamics of DNA hairpin formation using oxDNA, a nucleotide-level coarse-grained model of DNA. In particular, we explore the effects of the loop stacking interactions and non-native base pairing on the hairpin closing times. We find a non-monotonic variation of the hairpin closing time with temperature, in agreement with the experimental work of Wallace et al. [Proc. Nat. Acad. Sci. USA 2001, 98, 5584-5589]. The hairpin closing process involves the formation of an initial nucleus of one or two bonds between the stems followed by a rapid zippering of the stem. At high temperatures, typically above the hairpin melting temperature, an effective negative activation enthalpy is observed because the nucleus has a lower enthalpy than the open state. By contrast, at low temperatures, the activation enthalpy becomes positive mainly due to the increasing energetic cost of bending a loop that becomes increasingly highly stacked as the temperature decreases. We show that stacking must be very strong to induce this experimentally observed behavior, and that the existence of just a few weak stacking points along the loop can substantially suppress it. Non-native base pairs are observed to have only a small effect, slightly accelerating hairpin formation.

Majid Mosayebi; Flavio Romano; Thomas E. Ouldridge; Ard A. Louis; Jonathan P. K. Doye

2014-10-05T23:59:59.000Z

84

Thermodynamic Analysis of Alternative Approaches to Chemical Looping Combustion  

Science Journals Connector (OSTI)

Thermodynamic Analysis of Alternative Approaches to Chemical Looping Combustion ... Because H2 and syngas have similar combustion irreversibilities, when reforming is done optimally (with TR close to 650 K), iso-octane can be combusted with the same efficiency as that of preheated, isothermal H2 combustion. ... A loop of chem. ...

V. Kalyana Chakravarthy; C. Stuart Daw; Josh A. Pihl

2011-01-19T23:59:59.000Z

85

Closed-loop focus control system for laser welding  

SciTech Connect (OSTI)

In this paper the authors describe a focus control system for Nd:YAG laser welding based on an optical sensor incorporated into the fibre delivery system to detect light generated by the process. This broadband light is separated into two wavelength bands, and simple electronic processing gives a signal proportional to focal error, as a result of chromatic aberrations in the optical delivery system. Focus control is demonstrated for bead-on-plate welds in different thicknesses of titanium alloy, aluminum alloy, mild steel and stainless steel. The control system works for both pulsed and continuous laser radiation.

Haran, F.M.; Hand, D.P.; Jones, J.D.C. [Heriot-Watt Univ., Edinburgh (United Kingdom); Peters, C. [Lumonics Ltd., Rugby (United Kingdom)

1996-12-31T23:59:59.000Z

86

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

SciTech Connect (OSTI)

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

87

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

Open Energy Info (EERE)

to grants, the project will also be funded in-part from energy savings performance contracting. The demonstrated energy savings will be guaranteed by an energy services company...

88

In situ conversion process utilizing a closed loop heating system  

DOE Patents [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

89

Student Project Model Checking of a Closed-Loop  

E-Print Network [OSTI]

(PCA) infusion pump. They have also implemented a failure scenario where the safety of the patient.2 Model Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.2.1 PCA Infusion Pump such as infusion pumps can affect the patient'

90

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

E-Print Network [OSTI]

May 7, 2012 ... Abstract: We consider two game-theoretic models of the generation capacity expansion problem in liberalized electricity markets. The first is an ...

S. Wogrin

2012-05-07T23:59:59.000Z

91

Project Profile: Heliostat System with Wireless Closed-Loop Control  

Broader source: Energy.gov [DOE]

Thermata, under the 2012 SunShot Concentrating Solar Power (CSP) R&D funding opportunity announcement (FOA), is demonstrating a collector system with enhanced optical tracking capability. The unit includes a control system that provides real-time information to adjust the location of the reflected sunlight. It demonstrates a prototype heliostat system that meets the cost, performance, and reliability objectives of the SunShot Initiative.

92

Closed-loop real-time control on distributed networks  

E-Print Network [OSTI]

in presence of network delays and packet losses. A single actuator magnetic ball levitation system was used as a test bed to validate the proposed algorithm. A brief study of real-time requirements of the networked control system is presented and a client-server...

Ambike, Ajit Dilip

2004-11-15T23:59:59.000Z

93

ORC Closed Loop Control Systems for Transient and Steady State...  

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

waste heat recovery system running automatically over various drive cycles. p-26wright.pdf More Documents & Publications Development of an ORC system to improve HD truck...

94

Optimal instrumental variable method for closed-loop identification  

E-Print Network [OSTI]

Environment Centre, Lancaster, LA1 4YQ, UK Fenner School of Environment and Society, Australian National

Paris-Sud XI, Université de

95

Simple Refined IV Methods of Closed-Loop System Identification  

E-Print Network [OSTI]

Wales, Sydney Australia and Fenner School of Environment and Society, Australian National University

Paris-Sud XI, Université de

96

Chemical Looping Air Separation Unit and Methods of Use  

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

97

flow_loop.indd  

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

98

Connecting PHP and PHP Loops  

E-Print Network [OSTI]

Connecting PHP and MySQL 1 #12;Outline · PHP Loops · PHPMyAdmin · Introducing SQL · Connecting Database from PHP · Exercises 2 #12;Loops · A loop statement is a control structure that repeatedly PHP supports the C style while loop ­ The body of the cycle

Graham, Nick

99

Extreme ultra-violet emission from coronal loop structures. Technical report  

SciTech Connect (OSTI)

We calculate the XUV line and broad-band emission from a model active-region loop. The spectrum is found to be sensitive to both the coronal heating rate and to the loop geometry.

Tucker, W.H.

1980-07-01T23:59:59.000Z

100

Bimetallic Fe–Ni Oxygen Carriers for Chemical Looping Combustion  

Science Journals Connector (OSTI)

(2-4) In CLC (schematic in Figure 1), a fuel is combusted in a fuel reactor (“reducer”) in contact with an oxygen carrier (typically a metal oxide). ... After combustion of the fuel, the reduced metal is then transferred to the air reactor (“oxidizer”) where it is reoxidized by air, and then circulated back to the reducer to close the material “loop”. ... Son, S. R.; Kim, S. D.Chemical-looping combustion with NiO and Fe2O3 in a thermobalance and circulating fluidized bed reactor with double loops Ind. Eng. ...

Saurabh Bhavsar; Götz Veser

2013-05-20T23:59:59.000Z

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

Loop Driver Procedures IMPORTANT: If there is a problem at any time, immediately call the cell phone of the  

E-Print Network [OSTI]

you started your shift the Loop cart was in good condition, and the cell phone was on board and necessary to correct the problem. The first task when you begin your shift is to check the Loop cell phone name. Waiting During your work shift, keep the Loop cell phone close by and turned on as you wait

Sjölander, Kimmen

102

Hybrid Combustion-Gasification Chemical Looping  

SciTech Connect (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

103

NETL - Chemical Looping Reactor  

ScienceCinema (OSTI)

NETL's Chemical Looping Reactor unit is a high-temperature integrated CLC process with extensive instrumentation to improve computational simulations. A non-reacting test unit is also used to study solids flow at ambient temperature. The CLR unit circulates approximately 1,000 pounds per hour at temperatures around 1,800 degrees Fahrenheit.

None

2014-06-26T23:59:59.000Z

104

Loop Gas Model for Open Strings  

E-Print Network [OSTI]

The open string with one-dimensional target space is formulated in terms of an SOS, or loop gas, model on a random surface. We solve an integral equation for the loop amplitude with Dirichlet and Neumann boundary conditions imposed on different pieces of its boundary. The result is used to calculate the mean values of order and disorder operators, to construct the string propagator and find its spectrum of excitations. The latter is not sensible neither to the string tension $\\L$ nor to the mass $\\mu$ of the ``quarks'' at the ends of the string. As in the case of closed strings, the SOS formulation allows to construct a Feynman diagram technique for the string interaction amplitudes.

V. Kazakov; I. Kostov

1992-05-18T23:59:59.000Z

105

7 - Loop Statements in Matlab  

Science Journals Connector (OSTI)

This chapter explains the construction of for and while loop statements in Matlab. Also, this chapter explains combining conditional statements with loop statements. Recursive functions are explained further in this chapter. This chapter contains two projects that enable readers to solve advanced problems using Matlab. Keywords Control flow, for and while loop statements, recursive functions, Conway’s Game of Life

Munther Gdeisat; Francis Lilley

2013-01-01T23:59:59.000Z

106

An inverse correlation between loop length and stability in a four-helix-bundle protein  

E-Print Network [OSTI]

their intrinsic func- tionality upon their new environmental context: the calcium-binding activity of a loop has the molten globule behavior of apo- - lactalbumin in the absence of calcium [18]. Conversely, loops have beenAn inverse correlation between loop length and stability in a four-helix-bundle protein Athena D

Mochrie, Simon

107

Water-molecule network and active-site flexibility of apo protein tyrosine phosphatase 1B  

Science Journals Connector (OSTI)

The crystal structure of apo protein tyrosine phosphatase 1B has been determined to 1.95 Å resolution. The structure shows four highly coordinated water molecules in the active site of the enzyme and the WPD-loop in a closed conformation.

Pedersen, A.K.

2004-08-26T23:59:59.000Z

108

Chemical Looping Combustion Kinetics  

SciTech Connect (OSTI)

One of the most promising methods of capturing CO{sub 2} emitted by coal-fired power plants for subsequent sequestration is chemical looping combustion (CLC). A powdered metal oxide such as NiO transfers oxygen directly to a fuel in a fuel reactor at high temperatures with no air present. Heat, water, and CO{sub 2} are released, and after H{sub 2}O condensation the CO{sub 2} (undiluted by N{sub 2}) is ready for sequestration, whereas the nickel metal is ready for reoxidation in the air reactor. In principle, these processes can be repeated endlessly with the original nickel metal/nickel oxide participating in a loop that admits fuel and rejects ash, heat, and water. Our project accumulated kinetic rate data at high temperatures and elevated pressures for the metal oxide reduction step and for the metal reoxidation step. These data will be used in computational modeling of CLC on the laboratory scale and presumably later on the plant scale. The oxygen carrier on which the research at Utah is focused is CuO/Cu{sub 2}O rather than nickel oxide because the copper system lends itself to use with solid fuels in an alternative to CLC called 'chemical looping with oxygen uncoupling' (CLOU).

Edward Eyring; Gabor Konya

2009-03-31T23:59:59.000Z

109

A "loop entropy reduction" phage-display selection for folded amino acid sequences  

E-Print Network [OSTI]

is that insertion of a long disordered sequence into a loop of a host protein will substantially destabilize; ACCEPTED October 27, 2000) Abstract As a step toward selecting folded proteins from libraries of randomized the host because of the entropic cost of closing a loop in a disordered chain. If the inserted sequence

Baker, David

110

E-Print Network 3.0 - active region magnetic Sample Search Results  

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

AND DYNAMICS OF INTERCONNECTING LOOPS AND CORONAL HOLES IN ACTIVE LONGITUDES Summary: Sun. All hot active region loops are visible in this wavelength. Eruptions of new' and...

111

Dynamic PID loop control  

SciTech Connect (OSTI)

The Horizontal Test Stand (HTS) SRF Cavity and Cryomodule 1 (CM1) of eight 9-cell, 1.3GHz SRF cavities are operating at Fermilab. For the cryogenic control system, how to hold liquid level constant in the cryostat by regulation of its Joule-Thompson JT-valve is very important after cryostat cool down to 2.0 K. The 72-cell cryostat liquid level response generally takes a long time delay after regulating its JT-valve; therefore, typical PID control loop should result in some cryostat parameter oscillations. This paper presents a type of PID parameter self-optimal and Time-Delay control method used to reduce cryogenic system parameters oscillation.

Pei, L.; Klebaner, A.; Theilacker, J.; Soyars, W.; Martinez, A.; Bossert, R.; DeGraff, B.; Darve, C.; /Fermilab

2011-06-01T23:59:59.000Z

112

Very Cool Close Binaries  

E-Print Network [OSTI]

We present new observations of cool <6000K and low mass <1Msun binary systems that have been discovered by searching several modern stellar photometric databases. The search has led to a factor of 10 increase in the number of known cool close eclipsing binary systems.

J. Scott Shaw; Mercedes Lopez-Morales

2006-03-28T23:59:59.000Z

113

Alien Visitations Close Encounters  

E-Print Network [OSTI]

Alien Visitations #12;#12;Close Encounters · I: Visual sighting of aerial object (UFO) · II are indeed unidentified. ·Most are Venus. ·Almost certainly none are alien spacecraft Picture from Robert do aliens think? #12;How to Serve Man #12;#12;

Walter, Frederick M.

114

Sodium loop framework structural analysis  

SciTech Connect (OSTI)

This document provides the structural analysis of the Sodium Loop framework in a drop condition. The drop is similar to the US Department of Transportation non-bulk, performance-oriented packaging (Packaging Group I) drop test. The drop height evaluated for the Sodium Loop framework is 5.9 ft.

Nguyen, P.M.

1995-06-06T23:59:59.000Z

115

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.

116

Scaling of cosmic string loops  

E-Print Network [OSTI]

We study the spectrum of loops as a part of a complete network of cosmic strings in flat space-time. After a long transient regime, characterized by production of small loops at the scale of the initial conditions, it appears that a true scaling regime takes over. In the final regime the characteristic size of loops scales as $0.1 t$, and the production rate of small loops goes as $l^{-1.63}$. In the expanding universe, we expect similar behavior with perhaps a less negative index. For such indices, the distribution of loops existing at any given time goes as $l^{-5/2}$ in the radiation era and $l^{-2}$ in the matter era.

Vanchurin, V; Vilenkin, A; Olum, Ken D.; Vanchurin, Vitaly; Vilenkin, Alexander

2006-01-01T23:59:59.000Z

117

Jordan Loops Using Prover9/Mace4 to understand Jordan Loops  

E-Print Network [OSTI]

Jordan Loops Using Prover9/Mace4 to understand Jordan Loops Kyle Pula June 22nd, 2007 Kyle Pula Using Prover9/Mace4 to understand Jordan Loops #12;Jordan Loops Jordan Loops A loop is a set with binary) and x · e = e · x = x A Jordan loop is a commutative loop satisfying x2 y · x = x2 · yx (1) Kyle Pula

Veroff, Robert

118

Thermoelectric Power Generation System with Loop Thermosyphon...  

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

Power Generation System with Loop Thermosyphon in Future High Efficiency Hybrid Vehicles Thermoelectric Power Generation System with Loop Thermosyphon in Future High Efficiency...

119

Loop Quantum Gravity Phenomenology: Linking Loops to Observational Physics  

E-Print Network [OSTI]

Research during the last decade demonstrates that effects originating on the Planck scale are currently being tested in multiple observational contexts. In this review we discuss quantum gravity phenomenological models and their possible links to loop quantum gravity. Particle frameworks, including kinematic models, broken and deformed Poincar\\'e symmetry, non-commutative geometry, relative locality and generalized uncertainty principle, and field theory frameworks, including Lorentz violating operators in effective field theory and non-commutative field theory, are discussed. The arguments relating loop quantum gravity to models with modified dispersion relations are reviewed, as well as, arguments supporting the preservation of local Lorentz invariance. The phenomenology related to loop quantum cosmology is briefly reviewed, with a focus on possible effects that might be tested in the near future. As the discussion makes clear, there remains much interesting work to do in establishing the connection between the fundamental theory of loop quantum gravity and these specific phenomenological models, in determining observational consequences of the characteristic aspects of loop quantum gravity, and in further refining current observations. Open problems related to these developments are highlighted. characteristic aspects of loop quantum gravity, and in further refining current observations. Open problems related to these developments are highlighted.

Florian Girelli; Franz Hinterleitner; Seth A. Major

2012-12-13T23:59:59.000Z

120

Absolute Free Energy and Entropy of a Mobile Loop of the Enzyme Acetylcholinesterase Mihail Mihailescu and Hagai Meirovitch*  

E-Print Network [OSTI]

Absolute Free Energy and Entropy of a Mobile Loop of the Enzyme Acetylcholinesterase Mihail dissociation measurements suggest that the free-energy (F) penalty for the loop displacement is F ) Ffree contribution of water to the total free energy. Namely, for water densities close to the experimental value

Meirovitch, Hagai

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

Neutrino Factory Mercury Flow Loop  

E-Print Network [OSTI]

Neutrino Factory Mercury Flow Loop V. GravesV. Graves C. Caldwell IDS-NF Videoconference March 9, 2010 #12;Flow Loop Review · 1 cm dia nozzle, 20 m/s jet requires 1.57 liter/sec mercury flow (94 2 liter/min 24 9 gpm)mercury flow (94.2 liter/min, 24.9 gpm). · MERIT experiment showed that a pump

McDonald, Kirk

122

Method and apparatus for operating a powertrain system upon detecting a stuck-closed clutch  

DOE Patents [OSTI]

A powertrain system includes a multi-mode transmission having a plurality of torque machines. A method for controlling the powertrain system includes identifying all presently applied clutches including commanded applied clutches and the stuck-closed clutch upon detecting one of the torque-transfer clutches is in a stuck-closed condition. A closed-loop control system is employed to control operation of the multi-mode transmission accounting for all the presently applied clutches.

Hansen, R. Anthony

2014-02-18T23:59:59.000Z

123

Quantum fields on closed timelike curves  

SciTech Connect (OSTI)

Recently, there has been much interest in the evolution of quantum particles on closed timelike curves (CTCs). However, such models typically assume pointlike particles with only two degrees of freedom; a very questionable assumption given the relativistic setting of the problem. We show that it is possible to generalize the Deutsch model of CTCs to fields using the equivalent circuit formalism. We give examples for coherent, squeezed, and single-photon states interacting with the CTC via a beamsplitter. The model is then generalized further to account for the smooth transition to normal quantum mechanics as the CTC becomes much smaller than the size of the modes interacting on it. In this limit, we find that the system behaves like a standard quantum-mechanical feedback loop.

Pienaar, J. L.; Myers, C. R.; Ralph, T. C. [School of Mathematics and Physics, The University of Queensland, Brisbane 4072, Queensland (Australia)

2011-12-15T23:59:59.000Z

124

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

125

Pomona Loop Baseline Performance Testing.PDF  

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

126

THE COLD SHOULDER: EMISSION MEASURE DISTRIBUTIONS OF ACTIVE REGION CORES  

SciTech Connect (OSTI)

The coronal heating mechanism for active region core loops is difficult to determine because these loops are often not resolved and cannot be studied individually. Rather, we concentrate on the 'inter-moss' areas between loop footpoints. We use observations from the Hinode EUV Imaging Spectrometer and the X-Ray Telescope to calculate the emission measure distributions of eight inter-moss areas in five different active regions. The combined data sets provide both high- and low-temperature constraints and ensure complete coverage in the temperature range appropriate for active regions. For AR 11113, the emission can be modeled with heating events that occur on timescales less than the cooling time. The loops in the core regions appear to be close to equilibrium and are consistent with steady heating. The other regions studied, however, appear to be dominated by nanoflare heating. Our results are consistent with the idea that active region age is an important parameter in determining whether steady or nanoflare heating is primarily responsible for the core emission, that is, older regions are more likely to be dominated by steady heating, while younger regions show more evidence of nanoflares.

Schmelz, J. T.; Pathak, S., E-mail: jschmelz@memphis.edu [Physics Department, University of Memphis, Memphis, TN 38152 (United States)

2012-09-10T23:59:59.000Z

127

Thermodynamics in Loop Quantum Cosmology  

E-Print Network [OSTI]

Loop quantum cosmology (LQC) is very powerful to deal with the behavior of early universe. And the effective loop quantum cosmology gives a successful description of the universe in the semiclassical region. We consider the apparent horizon of the Friedmann-Robertson-Walker universe as a thermodynamical system and investigate the thermodynamics of LQC in the semiclassical region. The effective density and effective pressure in the modified Friedmann equation from LQC not only determine the evolution of the universe in LQC scenario but are actually also found to be the thermodynamic quantities. This result comes from the energy definition in cosmology (the Misner-Sharp gravitational energy) and is consistent with thermodynamic laws. We prove that within the framework of loop quantum cosmology, the elementary equation of equilibrium thermodynamics is still valid.

Li-Fang Li; Jian-Yang Zhu

2008-12-18T23:59:59.000Z

128

Magnetic phase diagram of small superconducting two-loop networks  

E-Print Network [OSTI]

The critical magnetic behaviour of simple superconducting micro-networks is illustrat- ed by discussing several properties of super- conducting micro-networks [1-3], see also [4]. This theoretical activity has beenL-277 Magnetic phase diagram of small superconducting two-loop networks J. Riess Centre de

Paris-Sud XI, Université de

129

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

SciTech Connect (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

130

Parallel MATLAB: Parallel For Loops  

E-Print Network [OSTI]

Parallel MATLAB: Parallel For Loops John Burkardt (FSU) Gene Cliff (AOE/ICAM - ecliff Research Computing ICAM: Interdisciplinary Center for Applied Mathematics 1 / 69 #12;MATLAB Parallel Example ODE SWEEP Example FMINCON Example Conclusion 2 / 69 #12;INTRO: Parallel MATLAB Parallel MATLAB

Crawford, T. Daniel

131

An Active Site Water Network in the Plasminogen Activator Pla from Yersinia pestis  

SciTech Connect (OSTI)

The plasminogen activator Pla from Yersinia pestis is an outer membrane protease (omptin) that is important for the virulence of plague. Here, we present the high-resolution crystal structure of wild-type, enzymatically active Pla at 1.9 {angstrom}. The structure shows a water molecule located between active site residues D84 and H208, which likely corresponds to the nucleophilic water. A number of other water molecules are present in the active site, linking residues important for enzymatic activity. The R211 sidechain in loop L4 is close to the nucleophilic water and possibly involved in the stabilization of the oxyanion intermediate. Subtle conformational changes of H208 result from the binding of lipopolysaccharide to the outside of the barrel, explaining the unusual dependence of omptins on lipopolysaccharide for activity. The Pla structure suggests a model for the interaction with plasminogen substrate and provides a more detailed understanding of the catalytic mechanism of omptin proteases.

Eren, Elif; Murphy, Megan; Goguen, Jon; van den Berg, Bert (UMASS, MED)

2010-08-13T23:59:59.000Z

132

Novel Reactor Design for Solid Fuel Chemical Looping Combustion  

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

133

Detecting and escaping infinite loops using Bolt  

E-Print Network [OSTI]

In this thesis we present Bolt, a novel system for escaping infinite loops. If a user suspects that an executing program is stuck in an infinite loop, the user can use the Bolt user interface, which attaches to the running ...

Kling, Michael (Michael W.)

2012-01-01T23:59:59.000Z

134

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...

Choi, Hye Mee

2004-09-30T23:59:59.000Z

135

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.

J. Frenkel; S. H. Pereira; N. Takahashi

2009-02-04T23:59:59.000Z

136

Hard thermal loops in static external fields  

SciTech Connect (OSTI)

We examine, 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 integral at zero external energies and momenta.

Frenkel, J.; Takahashi, N. [Universidade de Sao Paulo, Instituto de Fisica Rua do Matao, Travessa R, 187-05508-090 Cidade Universitaria, Sao Paulo, SP (Brazil); Pereira, S. H. [Universidade de Sao Paulo, Instituto de Astronomia, Geofisica e Ciencias Atmosfericas Rua do Matao, 1226-05508-090 Cidade Universitaria, Sao Paulo, SP (Brazil)

2009-04-15T23:59:59.000Z

137

Oscillation damping of chiral string loops  

E-Print Network [OSTI]

Chiral cosmic string loop tends to the stationary (vorton) configuration due to the energy loss into the gravitational and electromagnetic radiation. We describe the asymptotic behaviour of near stationary chiral loops and their fading to vortons. General limits on the gravitational and electromagnetic energy losses by near stationary chiral loops are found. For these loops we estimate the oscillation damping time. We present solvable examples of gravitational radiation energy loss by some chiral loop configurations. The analytical dependence of string energy with time is found in the case of the chiral ring with small amplitude radial oscillations.

Eugeny Babichev; Vyacheslav Dokuchaev

2002-04-26T23:59:59.000Z

138

Large rank Wilson loops in N=2 superconformal QCD at strong coupling  

E-Print Network [OSTI]

We compute the expectation values of circular Wilson loops in large representations at strong coupling, in the large-N limit of the N=2 superconformal theory with SU(N) gauge group and 2N hypermultiplets. Employing Pestun's matrix integral, we focus attention on symmetric and antisymmetric representations with ranks of order N. We find that large rank antisymmetric loops are independent of the coupling at strong 't Hooft coupling while symmetric Wilson loops grow exponentially with it. Symmetric loops display a non-analyticity as a function of the rank, characterized by the splitting of a single matrix model eigenvalue from the continuum, bearing close resemblance to Bose-Einstein condensation in an ideal gas. We discuss implications of these for a putative large-N string dual. The method of calculation we adopt makes explicit the connection to Fermi and Bose gas descriptions and also suggests a tantalizing connection of the above system to a multichannel Kondo model.

Benedict Fraser; S. Prem Kumar

2012-02-28T23:59:59.000Z

139

Chemical Looping for Combustion and Hydrogen Production  

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

140

Active Terahertz Metamaterial Devices  

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

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

Closed loop adaptive control of spectrum-producing step using neural networks  

DOE Patents [OSTI]

Characteristics of the plasma in a plasma-based manufacturing process step are monitored directly and in real time by observing the spectrum which it produces. An artificial neural network analyzes the plasma spectrum and generates control signals to control one or more of the process input parameters in response to any deviation of the spectrum beyond a narrow range. In an embodiment, a plasma reaction chamber forms a plasma in response to input parameters such as gas flow, pressure and power. The chamber includes a window through which the electromagnetic spectrum produced by a plasma in the chamber, just above the subject surface, may be viewed. The spectrum is conducted to an optical spectrometer which measures the intensity of the incoming optical spectrum at different wavelengths. The output of optical spectrometer is provided to an analyzer which produces a plurality of error signals, each indicating whether a respective one of the input parameters to the chamber is to be increased or decreased. The microcontroller provides signals to control respective controls, but these lines are intercepted and first added to the error signals, before being provided to the controls for the chamber. The analyzer can include a neural network and an optional spectrum preprocessor to reduce background noise, as well as a comparator which compares the parameter values predicted by the neural network with a set of desired values provided by the microcontroller.

Fu, Chi Yung (San Francisco, CA)

1998-01-01T23:59:59.000Z

142

Closing the loop : improving technology transfer by learning from the past  

E-Print Network [OSTI]

Technology transfer is a significant challenge within the highly regulated pharmaceutical industry. While much focus is put on the logistics and strategy of the process, less attention has been paid to how to change the ...

Witinski, Paul (Paul F.)

2010-01-01T23:59:59.000Z

143

Optimal Prices and Production Rate in a Closed Loop Supply Chain under Heavy Traffic  

E-Print Network [OSTI]

uncertainties in addition to those already present in manufacturing and selling new products. Demand uncertainty less material and energy than manufacturing, prevents potentially harmful disposal, and retains some of the value added by the original manufacturing process. To the original producer or a third party reprocessor

Ghosh, Arka P.

144

Analysis and design of closed-loop control of power electronic converter systems  

E-Print Network [OSTI]

filter system to cancel neutral current harmonic (IOOA) in a threephase four-wire electric distribution system. (b)Input power factor correction and harmonic reduction stage of a commercially available electronic ballast (12OV, 64W) for fluorescent...

Huang, Yenchin

2012-06-07T23:59:59.000Z

145

Closed-loop study of the effects of multicycle re-refining of automotive lubricating oil  

SciTech Connect (OSTI)

Twenty-five gallons of a hydrofinished virgin lubricating oil basestock was blended with additives into a 10W30 crankcase oil. After the engines had been pruged with a flush oil, 11 vehicles were charged with the blended virgin oil. Mileages ranging from 2000 to over 3000 miles of use were accumulated before the oil was drained, re-refined and recharged to the vehicles. This cycle was repeated until the oil had been re-refined three times. At each stage, detailed analyses and compound characterizations were performed on both the oil being recycled and on the same oil which was re-refined but never charged to vehicles. The data showed no significant change in the composition of the base oil, except for a minor buildup of additive base oil, which was expected.

Reynolds, J.W.; Goetzinger, J.W.; Cotton, F.O.; Brinkman, D.W.; Whisman, M.L.

1982-03-01T23:59:59.000Z

146

Effect of Varying Controller Parameters in Closed-Loop Subspace Identification  

E-Print Network [OSTI]

-defined. An overview of different techniques for auto- 1 Morten.Bakke@Honeywell.com. Present address: Honeywell Pro

Skogestad, Sigurd

147

An Analytical Approach for Closed-Loop Power Control Error Estimations in CDMA Cellular Systems  

E-Print Network [OSTI]

(PCE). The power emitted by a mobile terminal is limited by tech- nological and normative constraints con- tributes to PCE. The distribution of PCE is often assumed log-normal [7],[8],[9], nevertheless, a more accurate statisti- cal characterization of PCE is desirable in order to evaluate the suitability

Abrardo, Andrea

148

Development of Real-time Closed-loop Control Algorithms for Grid-scale Battery  

E-Print Network [OSTI]

Reliability Under Cooperative Agreement No. DE-EE0003507 Hawai`i Energy Sustainability Program Task 3.2 Report ................................................. 29 7.2. Architecture and HMI Step

149

Polarimetric glucose sensing utilizing a digital closed-loop control system  

E-Print Network [OSTI]

of this research. TABLE OF CONTENTS Page ABSTRACT. DEDICATION. ACKNOWLEDGMENTS. LIST OF FIGURES. . . . . . . . . . VI . . X LIST OF TABLES. . CHAPTER INTRODUCTION . . THEORY. Optical Theory. a. The Foundations of Polarimetry. . . . b. Faraday... Faraday modulator. . . . 17 2. 5 Block diagram of the optical train for the designed polarimeter . . . . 19 2. 6 2. 7 Molecular structures of D-Glucose. . Glucose ORD curve in the visible spectrum. . . 22 . . . 24 2. 8 Anatomy of the eye. 26 2. 9...

Cameron, Brent Duane

2012-06-07T23:59:59.000Z

150

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

E-Print Network [OSTI]

determination of glucose is to measure the rotational change in the beam of light when it is passed through a bodily fluid. Polarimetry was discovered by Biot in the early 1800's. In 1956, Gilliham [13] proposed a precision polarimeter that used a Faraday... the glucose in the aqueous humor of the eye utilizing the Faraday effect. Laser polarimetry was researched extensively since 1990 [16-22]. In 1992, a true phase measurement technique was presented by Cote et. al. [18]. Cote et. al. [17-18] worked further...

Gorde, Harshal Wasudeo

2012-06-07T23:59:59.000Z

151

Identification in Closed Loop Operation of Models for Collective Pitch Robust Controller Design.  

E-Print Network [OSTI]

. Iribas-Latour* I-D. Landau ** *Wind Energy Department, CENER c/ Ciudad de la Innovacion nº7. 31621 but its design and implementation is much simpler. List of Acronyms WT ­ wind turbine. COLM - control-00680862,version1-20Mar2012 Author manuscript, published in "Wind Energy (2012) WE-09-0099.R2" DOI : 10

Paris-Sud XI, Université de

152

Power Generating Stationary Engines Nox Control: A Closed Loop Control Technology  

Broader source: Energy.gov [DOE]

Poster presented at the 16th Directions in Engine-Efficiency and Emissions Research (DEER) Conference in Detroit, MI, September 27-30, 2010.

153

Diesel Combustion Control with Closed-Loop Control of the Injection Strategy  

Broader source: Energy.gov [DOE]

New control strategies are enabler for new combustion concepts for further reduction of engine out emission

154

Closed-Loop Control of Lift for Longitudinal Gust Suppression at Low Reynolds Numbers  

E-Print Network [OSTI]

Kerstens Illinois Institute of Technology, Chicago, Illinois 60616 Jens Pfeiffer Technical University of Berlin, 10623 Berlin, Germany David Williams Illinois Institute of Technology, Chicago, Illinois 60616 with a quasi-steady approach, such as extending the range and endurance of flight vehicles by energy extraction

Dabiri, John O.

155

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

E-Print Network [OSTI]

, a fan coil unit and a condensing unit which the fan coil unit is located inside the room and another one

Ghajar, Afshin J.

156

Revisiting the Closed Loop Response of PWM Converters Controlled by Voltage Feedback  

E-Print Network [OSTI]

mentioned in earlier publications [1-3] and handled by trial and error procedure. No rigorous treatment technology. The reason for this popularity is primarily the difficulty of implementing a fast digitally applies lag-lead network (PID structure compensator) to regulate the output voltage and set the desired

157

Closed-loop model identification and PID/PI tuning for robust anti-slug control  

E-Print Network [OSTI]

is the recommended solution to prevent severe slugging flow at offshore oilfields. This requires operation in an open in the industry, but they need to be tuned appropriately for robustness against plant changes and large inflow control 1. INTRODUCTION The severe-slugging flow regime at offshore oilfields is characterized by large

Skogestad, Sigurd

158

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

Science Journals Connector (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

159

Closed-loop Reference Model adaptive control : with application to very flexible aircraft  

E-Print Network [OSTI]

One of the main features of adaptive systems is an oscillatory convergence that exacerbates with the speed of adaptation. Over the past two decades several attempts have been made to provide adaptive solutions with guaranteed ...

Gibson, Travis Eli

2014-01-01T23:59:59.000Z

160

The sign stability gain for the following closed loop sign stable State space representation of  

E-Print Network [OSTI]

well in as wide velocity range (v) as possible and in as wide changes in the road adhesion coefficient Capacity Variations Actuators (Inputs) WF36: Fuel Flow AE24 : Variable Bleed Valve STP25: Variable

Yedavalli, Rama K.

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

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

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

162

In situ heat treatment process utilizing a closed loop heating system  

DOE Patents [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

163

Closed/open string diagrammatics  

E-Print Network [OSTI]

May 3, 2006 ... R.M. Kaufmann, R.C. Penner / Nuclear Physics B 748 [FS] (2006) 335–379. In terms of open/closed theories beyond the topological level, many ...

2006-06-28T23:59:59.000Z

164

Wilson loop and contour shapes  

Science Journals Connector (OSTI)

By computing the Wilson loop expectation value W[C] in the two-dimensional Schwinger model on R1×S1, we show that nonleading terms depend on the shape of the contours both on R1×R1 and R1×S1. We also find that the rhombic contour and triangular contour lead to the same static potentials both on R1×R1 and R1×S1. The binding energy is also affected by the choice of contour shapes on the R1×S1 model. This indicates that the model on R1×S1 deserves more study.

W. F. Kao

1990-12-15T23:59:59.000Z

165

Scaling Solution for Small Cosmic String Loops  

Science Journals Connector (OSTI)

The equation governing the time evolution of the number density of loops in a cosmic string network is a detailed balance determined by energy conservation. We solve this equation with the inclusion of the gravitational radiation effect, which causes the loops to shrink (and eventually decay) as time elapses. The solution approaches a scaling regime in which the total energy density in loops remains finite, converging both in the infrared and in the ultraviolet.

Jorge V. Rocha

2008-02-21T23:59:59.000Z

166

Cosmic string loops, large and small  

Science Journals Connector (OSTI)

We extend our earlier model of the small-scale structure of cosmic string networks through an improved treatment of the separation of long and short scales. We find that the production of small loops (at the gravitational radiation scale) is a robust feature of string networks, in addition to a population of loops near the horizon scale. We obtain quantitative agreement with the scaling of loop production functions as found in simulations by two groups.

Florian Dubath; Joseph Polchinski; Jorge V. Rocha

2008-06-23T23:59:59.000Z

167

The conformal loop ensemble nesting field  

E-Print Network [OSTI]

The conformal loop ensemble CLE$_\\kappa$ with parameter $8/3 nesting field. We generalize this result by assigning i.i.d. weights to the loops, and we treat an alternate notion of convergence to the nesting field in the case where the weight distribution has mean zero. We also establish estimates for moments of the number of CLE loops surrounding two given points.

Jason Miller; Samuel S. Watson; David B. Wilson

2014-12-21T23:59:59.000Z

168

Wilson loop dependence on the contour shape  

Science Journals Connector (OSTI)

By computing exactly the Wilson loop expectation value for two-dimensional quantum electrodynamics, we show that the nonleading terms depend drastically on the shape of the contour.

H. A. Falomir, R. E. Gamboa Saraví, and F. A. Schaposnik

1982-01-15T23:59:59.000Z

169

Vehicle Technologies Office: Closed Solicitations  

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

170

Activities  

Broader source: Energy.gov [DOE]

Activities and events provide Residential Network members the opportunity to discuss similar needs and challenges, and to collectively identify effective strategies and useful resources.

171

Hardware In The Loop Simulator in UAV Rapid Development Life Cycle  

E-Print Network [OSTI]

Field trial is very critical and high risk in autonomous UAV development life cycle. Hardware in the loop (HIL) simulation is a computer simulation that has the ability to simulate UAV flight characteristic, sensor modeling and actuator modeling while communicating in real time with the UAV autopilot hardware. HIL simulation can be used to test the UAV autopilot hardware reliability, test the closed loop performance of the overall system and tuning the control parameter. By rigorous testing in the HIL simulator, the risk in the field trial can be minimized.

Adiprawita, Widyawardana; Semibiring, Jaka

2008-01-01T23:59:59.000Z

172

Transient Simulations of Spouted Fluidized Bed for Coal-Direct Chemical Looping Combustion  

Science Journals Connector (OSTI)

Transient Simulations of Spouted Fluidized Bed for Coal-Direct Chemical Looping Combustion ... Instead of having air to support the combustion process, an oxygen compound (metal or non-metal based) is used as an oxidizer in the fuel reactor; thus, the fuel is chemically combusted by the metal oxide than the oxygen present in air in case of standard power plants. ... The CFD/DEM simulation approach has been used in various applications which require the modeling of particle/fluid interaction;(19-23) however, its application in the context of close-loop spouted fluidized bed system has so far been quite limited and preliminary. ...

Zheming Zhang; Ling Zhou; Ramesh Agarwal

2014-01-28T23:59:59.000Z

173

20 - Chemical looping combustion (CLC)  

Science Journals Connector (OSTI)

Abstract: Chemical-looping combustion (CLC) is a new combustion technology with inherent separation of the greenhouse gas CO2. The technology involves the use of a metal oxide as an oxygen carrier which transfers oxygen from combustion air to the fuel, and hence a direct contact between air and fuel is avoided. Two inter-connected fluidized beds, i.e. fuel reactor and air reactor, are used in the process. The outlet gas from the fuel reactor consists ideally of CO2 and H2O, and the latter is easily removed by condensation. This chapter presents the basic principles, gives an overview of oxygen-carrier materials and operational experiences, discusses the application to gaseous, liquid and solid fuels, and the use for combustion as well as for hydrogen production.

A. Lyngfelt

2013-01-01T23:59:59.000Z

174

Loop calculus for lattice gauge theories  

Science Journals Connector (OSTI)

Hamiltonian calculations are performed using a loop-labeled basis where the full set of identities for the SU(N) gauge models has been incorporated. The loops are classified as clusterlike structures and the eigenvalue problem leads to a linear set of finite-difference equations easily amenable to numerical treatment. Encouraging results are reported for SU(2) at spatial dimension 2.

Rodolfo Gambini; Lorenzo Leal; Antoni Trias

1989-05-15T23:59:59.000Z

175

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

SciTech Connect (OSTI)

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

176

Coal Direct Chemical Looping (CDCL) Process Development  

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

177

E-Print Network 3.0 - arbitrary control loop Sample Search Results  

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

5 > >> 1 Optimizing Nested Loops with Loop Distribution and Loop Fusion Department of Computer Science and Engineering Summary: . Mckinley. Loop distribution with arbitrary control...

178

SAVE THIS | EMAIL THIS | Close  

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

179

Why Not Consider Closed Universes?  

E-Print Network [OSTI]

We consider structure formation and CMB anisotropies in a closed universe, both with and without a cosmological constant. The CMB angular power spectrum and the matter transfer function are presented, along with a discussion of their relative normalization. This represents the first full numerical evolution of density perturbations and anisotropies in a spherical geometry. We extend the likelihood function vs. Omega from the COBE 2-year data to Omega>=1. For large Omega the presence of a very steep rise in the spectrum towards low ell allows us to put an upper limit of Omega<=1.5 (95%CL) for primordial spectra with n<=1. This compares favorably with existing limits on Omega. We show that there are a range of closed models which are consistent with observational constraints while being even older than the currently popular flat models with a cosmological constant. Future constraints from degree scale CMB data may soon probe this region of parameter space. A derivation of the perturbed Einstein, fluid and Boltzmann equations for open and closed geometries is presented in an appendix.

Martin White; Douglas Scott

1995-08-31T23:59:59.000Z

180

Boosted Fast Flux Loop Final Report  

SciTech Connect (OSTI)

The Boosted Fast Flux Loop (BFFL) project was initiated to determine basic feasibility of designing, constructing, and installing in a host irradiation facility, an experimental vehicle that can replicate with reasonable fidelity the fast-flux test environment needed for fuels and materials irradiation testing for advanced reactor concepts. Originally called the Gas Test Loop (GTL) project, the activity included (1) determination of requirements that must be met for the GTL to be responsive to potential users, (2) a survey of nuclear facilities that may successfully host the GTL, (3) conceptualizing designs for hardware that can support the needed environments for neutron flux intensity and energy spectrum, atmosphere, flow, etc. needed by the experimenters, and (4) examining other aspects of such a system, such as waste generation and disposal, environmental concerns, needs for additional infrastructure, and requirements for interfacing with the host facility. A revised project plan included requesting an interim decision, termed CD-1A, that had objectives of' establishing the site for the project at the Advanced Test Reactor (ATR) at the Idaho National Laboratory (INL), deferring the CD 1 application, and authorizing a research program that would resolve the most pressing technical questions regarding GTL feasibility, including issues relating to the use of booster fuel in the ATR. Major research tasks were (1) hydraulic testing to establish flow conditions through the booster fuel, (2) mini-plate irradiation tests and post-irradiation examination to alleviate concerns over corrosion at the high heat fluxes planned, (3) development and demonstration of booster fuel fabrication techniques, and (4) a review of the impact of the GTL on the ATR safety basis. A revised cooling concept for the apparatus was conceptualized, which resulted in renaming the project to the BFFL. Before the subsequent CD-1 approval request could be made, a decision was made in April 2006 that further funding for the project would be suspended. Remaining funds have been used to prepare and irradiate mini-plates of the proposed booster fuel. The current baseline design is for a set of three test positions inside an in-pile tube with a thermal neutron absorber and heat sink made of aluminum mixed with hafnium. Operating the ATR at power levels needed to achieve the required fast flux will result in an estimated increase in ATR fuel consumption between 15 and 20% above present rates and a reduction in the time between fuel replacements. Preliminary safety analyses conducted have indicted safe operation of the ATR with the GTL under normal, abnormal, and postulated accident conditions. More comprehensive analyses are needed.

Boosted Fast Flux Loop Project Staff

2009-09-01T23:59:59.000Z

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.


181

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

182

Closed cycle liquid helium refrigerators  

Science Journals Connector (OSTI)

We have developed closed cycle liquid helium refrigerators using a Joule Thomson circuit precooled by commercially available two staged Gifford Mac Mahon cryocoolers. The Joule Thomson counterflow heat exchangers are modular and have been thermo-hydraulically characterized. Fully automatic cool down and operation are achieved by two pneumatically driven by pass and expansion valves. Several apparatus have been built or are under assembly with cooling power ranging from 100 mW up to 5 Watt, for temperature ranging from 2.8 K up to 4.5 K. A trouble free operation with several warm up and cool down cycles has been proven over 7000 hours.

G. Claudet; R. Lagnier; A. Ravex

1992-01-01T23:59:59.000Z

183

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

184

Singularities and Closed String Tachyons  

SciTech Connect (OSTI)

A basic problem in gravitational physics is the resolution of spacetime singularities where general relativity breaks down. The simplest such singularities are conical singularities arising from orbifold identifications of flat space, and the most challenging are spacelike singularities inside black holes (and in cosmology). Topology changing processes also require evolution through classically singular spacetimes. I briefly review how a phase of closed string tachyon condensate replaces, and helps to resolve, basic singularities of each of these types. Finally I discuss some interesting features of singularities arising in the small volume limit of compact negatively curved spaces and the emerging zoology of spacelike singularities.

Silverstein, Eva; /SLAC /Stanford U., Phys. Dept.

2006-03-17T23:59:59.000Z

185

Modulation of DNA loop lifetimes by the free energy of loop formation  

E-Print Network [OSTI]

Storage and retrieval of the genetic information in cells is a dynamic process that requires the DNA to undergo dramatic structural rearrangements. DNA looping is a prominent example of such a structural rearrangement that is essential for transcriptional regulation in both prokaryotes and eukaryotes, and the speed of such regulations affects the fitness of individuals. Here, we examine the in vitro looping dynamics of the classic Lac repressor gene-regulatory motif. We show that both loop association and loop dissociation at the DNA-repressor junctions depend on the elastic deformation of the DNA and protein, and that both looping and unlooping rates approximately scale with the looping J factor, which reflects the system's deformation free energy. We explain this observation by transition state theory and model the DNA-protein complex as an effective worm-like chain with twist. We introduce a finite protein-DNA binding interaction length, in competition with the characteristic DNA deformation length scale, ...

Chen, Yi-Ju; Mulligan, Peter; Spakowitz, Andrew J; Phillips, Rob

2015-01-01T23:59:59.000Z

186

Detecting and escaping infinite loops with jolt  

E-Print Network [OSTI]

Infinite loops can make applications unresponsive. Potential problems include lost work or output, denied access to application functionality, and a lack of responses to urgent events. We present Jolt, a novel system for ...

Carbin, Michael James

187

FCH Optical Phase-Locked Loop  

E-Print Network [OSTI]

¦ î ¤ ü � ø Ð Ð ú ¸ � í ® FCH Optical Phase- Locked Loop� � û ³ è Optimization of Optica1 Phase

Choi, Woo-Young

188

Illusory spirals and loops in crystal growth  

Science Journals Connector (OSTI)

...spirals and loops in crystal growth 10.1073/pnas.1311637110 Alexander G. Shtukenberg Zina Zhu Zhihua An Misha Bhandari Pengcheng Song Bart Kahr Michael D. Ward Molecular Design Institute and Department of Chemistry, New York University, New York...

Alexander G. Shtukenberg; Zina Zhu; Zhihua An; Misha Bhandari; Pengcheng Song; Bart Kahr; Michael D. Ward

2013-01-01T23:59:59.000Z

189

SIMULTANEOUS OBSERVATION OF SOLAR OSCILLATIONS ASSOCIATED WITH CORONAL LOOPS FROM THE PHOTOSPHERE TO THE CORONA  

SciTech Connect (OSTI)

The solar oscillations along one coronal loop in AR 11504 are observed simultaneously in white light emission and Doppler velocity by SDO/HMI, and in UV and EUV emissions by SDO/AIA. The technique of the time-distance diagram is used to detect the propagating oscillations of the emission intensities along the loop. We find that although all the oscillation signals were intercorrelated, the low chromospheric oscillation correlated more closely to the oscillations of the transition region and corona than to those of the photosphere. Situated above the sunspot, the oscillation periods were {approx}3 minutes in the UV/EUV emissions; however, moving away from the sunspot and into the quiet Sun, the periods became longer, e.g., up to {approx}5 minutes or more. In addition, along another loop we observe both the high-speed outflows and oscillations, which roughly had a one-to-one corresponding relationship. This indicates that the solar periodic oscillations may modulate the magnetic reconnections between the loops of the high and low altitudes that drive the high-speed outflows along the loop.

Su, J. T.; Liu, S.; Zhang, Y. Z.; Zhao, H.; Xu, H. Q.; Xie, W. B. [Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Science, Beijing 100012 (China)] [Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Science, Beijing 100012 (China); Liu, Y. [National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011 (China)] [National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011 (China)

2013-01-01T23:59:59.000Z

190

Hysteresis loop area of the Ising model  

Science Journals Connector (OSTI)

The hysteresis of the Ising model in a spatially homogeneous ac field is studied using both mean-field calculations and two-dimensional Monte Carlo simulations. The frequency dispersion and the temperature dependence of the hysteresis loop area are studied in relation to the dynamic symmetry loss. The dynamic mechanisms may be different when the hysteresis loops are symmetric or asymmetric, and they can lead to a double-peak frequency dispersion and qualitatively different temperature dependence.

Han Zhu; Shuai Dong; J.-M. Liu

2004-10-12T23:59:59.000Z

191

From Inductance Loops to Vehicle Trajectories  

E-Print Network [OSTI]

to Vehicle Trajectories ­ p.2/19 #12;Birmingham Box motorway system 000000 111111 00 0000 11 1111 J4 J5 J6-identification for e.g. incident detection) From Inductance Loops to Vehicle Trajectories ­ p.8/19 #12;6 sites � 20sFrom Inductance Loops to Vehicle Trajectories R. Eddie Wilson, University of Bristol EPSRC Advanced

Bertini, Robert L.

192

Quantum Kinematics of Bosonic Vortex Loops  

SciTech Connect (OSTI)

Poisson structure for vortex filaments (loops and arcs) in 2D ideal incompressible fluid is analyzed in detail. Canonical coordinates and momenta on coadjoint orbits of the area-preserving diffeomorphism group, associated with such vortices, are found. The quantum space of states in the simplest case of ''bosonic'' vortex loops is built within a geometric quantization approach to the description of a quantum fluid. Fock-like structure and non-local creation and annihilation operators of quantum vortex filaments are introduced.

Goldin, G.A.; Owczarek, R.; Sharp, D.H.

1999-05-06T23:59:59.000Z

193

Nanostructured Oxygen Carriers for Chemical Looping Combustion and Chemical Looping Hydrogen Production.  

E-Print Network [OSTI]

??Chemical looping combustion (CLC) is an emerging technology for clean energy-production. In CLC, an oxygen carrier is periodically oxidized with air and then reduced in… (more)

Solunke, Rahul Dushyantrao

2011-01-01T23:59:59.000Z

194

activities  

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

195

Acceleration of string loops in the Schwarzschild-de Sitter geometry  

E-Print Network [OSTI]

We study acceleration of current-carrying string loops governed by the presence of an outer tension barrier and an inner angular momentum barrier in the field of Schwarzschild-de Sitter black holes. We restrict attention to the axisymmetric motion of string loops with energy high enough, when the string loop can overcome the gravitational attraction and escape to infinity. We demonstrate that string loops can be scattered near the black hole horizon, and the energy of string oscillations can be efficiently converted to the energy of their linear motion. Such a transmutation effect can potentially represent acceleration of jets in active galactic nuclei and microquasars. We give the conditions limiting energy available for conversion onto the jetlike motion. Surprisingly, we are able to show that string loops starting from rest can be accelerated up to velocities v\\simc even in the field of Schwarzschild black holes, if their angular momentum parameter is low enough. Such loops could serve as an explanation of...

Stuchlík, Z; 10.1103/PhysRevD.85.065022

2012-01-01T23:59:59.000Z

196

USING MODEL CHECKING TO DERIVE LOOP BOUNDS OF GENERAL LOOPS WITHIN ANSI-C APPLICATIONS FOR  

E-Print Network [OSTI]

USING MODEL CHECKING TO DERIVE LOOP BOUNDS OF GENERAL LOOPS WITHIN ANSI-C APPLICATIONS for applications written in ANSI-C. The described method uses a model checker and a binary search algorithm with little pro- gramming effort for applications written in ANSI-C. The performance is probably inferior

197

Towards LHC phenomenology at the loop level: A new method for one-loop amplitudes  

E-Print Network [OSTI]

A precise understanding of LHC phenomenology requires the inclusion of one-loop corrections for multi-particle final states. In this talk we describe a semi-numerical method to compute one-loop amplitudes with many external particles and present first applications.

T. Binoth; M. Ciccolini; G. Heinrich

2006-01-30T23:59:59.000Z

198

DETERMINATION OF GUIDANCE VALUES FOR CLOSED LANDFILL GAS EMISSIONS  

E-Print Network [OSTI]

DETERMINATION OF GUIDANCE VALUES FOR CLOSED LANDFILL GAS EMISSIONS O. BOUR*, S. BERGER**, C Gambetta, 74 000 Annecy SUMMARY: In order to promote active landfill gas collection and treatment or natural attenuation, it is necessary to identify trigger values concerning landfill gas emissions

Boyer, Edmond

199

Imaging Oxygen Molecules Up Close | EMSL  

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

Imaging Oxygen Molecules Up Close Imaging Oxygen Molecules Up Close ARRA-enabled upgrades enhance research capabilities STM images of the same TiO2(110) area upon O2 chemisorption...

200

Examining System-Wide Impacts of Solar PV Control Systems with a Power Hardware-in-the-Loop Platform  

SciTech Connect (OSTI)

High penetration levels of distributed solar PV power generation can lead to adverse power quality impacts such as excessive voltage rise, voltage flicker, and reactive power values that result in unacceptable voltage levels. Advanced inverter control schemes have been proposed that have the potential to mitigate many power quality concerns. However, closed-loop control may lead to unintended behavior in deployed systems as complex interactions can occur between numerous operating devices. In order to enable the study of the performance of advanced control schemes in a detailed distribution system environment, a Hardware-in-the-Loop (HIL) platform has been developed. In the HIL system, GridLAB-D, a distribution system simulation tool, runs in real-time mode at the Pacific Northwest National Laboratory (PNNL) and supplies power system parameters at a point of common coupling to hardware located at the National Renewable Energy Laboratory (NREL). Hardware inverters interact with grid and PV simulators emulating an operational distribution system and power output from the inverters is measured and sent to PNNL to update the real-time distribution system simulation. The platform is described and initial test cases are presented. The platform is used to study the system-wide impacts and the interactions of controls applied to inverters that are integrated into a simulation of the IEEE 8500-node test feeder, with inverters in either constant power factor control or active volt/VAR control. We demonstrate that this HIL platform is well-suited to the study of advanced inverter controls and their impacts on the power quality of a distribution feeder. Additionally, the results from HIL are used to validate GridLAB-D simulations of advanced inverter controls. ?

Williams, Tess L.; Fuller, Jason C.; Schneider, Kevin P.; Palmintier, Bryan; Lundstrom, Blake; Chakraborty, Sudipta

2014-10-11T23:59:59.000Z

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.


201

Torus knot polynomials and susy Wilson loops  

E-Print Network [OSTI]

We give, using an explicit expression obtained in [V. Jones, Ann. of Math. 126, 335 (1987)], a basic hypergeometric representation of the HOMFLY polynomial of $(n,m)$ torus knots, and present a number of equivalent expressions, all related by Heine's transformations. Using this result the $(m,n)\\leftrightarrow (n,m)$ symmetry and the leading polynomial at large $N$ are explicit. We show the latter to be the Wilson loop of 2d Yang-Mills theory on the plane. In addition, after taking one winding to infinity, it becomes the Wilson loop in the zero instanton sector of the 2d Yang-Mills theory, which is known to give averages of Wilson loops in $\\mathcal{N}$=4 SYM theory. We also give, using matrix models, an interpretation of the HOMFLY polynomial and the corresponding Jones-Rosso representation in terms of $q$-harmonic oscillators.

Georgios Giasemidis; Miguel Tierz

2014-01-31T23:59:59.000Z

202

Torus knot polynomials and susy Wilson loops  

E-Print Network [OSTI]

We give, using an explicit expression obtained in [V. Jones, Ann. of Math. 126, 335 (1987)], a basic hypergeometric representation of the HOMFLY polynomial of $(n,m)$ torus knots, and present a number of equivalent expressions, all related by Heine's transformations. Using this result the $(m,n)\\leftrightarrow (n,m)$ symmetry and the leading polynomial at large $N$ are explicit. We show the latter to be the Wilson loop of 2d Yang-Mills theory on the plane. In addition, after taking one winding to infinity, it becomes the Wilson loop in the zero instanton sector of the 2d Yang-Mills theory, which is known to give averages of Wilson loops in $\\mathcal{N}$=4 SYM theory. We also give, using matrix models, an interpretation of the HOMFLY polynomial and the corresponding Jones-Rosso representation in terms of $q$-harmonic oscillators.

Giasemidis, Georgios

2014-01-01T23:59:59.000Z

203

String loops in the field of braneworld spherically symmetric black holes and naked singularities  

SciTech Connect (OSTI)

We study motion of current-carrying string loops in the field of braneworld spherically symmetric black holes and naked singularities. The spacetime is described by the Reissner-Nordström geometry with tidal charge b reflecting the non-local tidal effects coming from the external dimension; both positive and negative values of the spacetime parameter b are considered. We restrict attention to the axisymmetric motion of string loops when the motion can be fully governed by an appropriately defined effective potential related to the energy and angular momentum of the string loops. In dependence on these two constants of the motion, the string loops can be captured, trapped, or can escape to infinity. In close vicinity of stable equilibrium points at the centre of trapped states the motion is regular. We describe how it is transformed to chaotic motion with growing energy of the string loop. In the field of naked singularities the trapped states located off the equatorial plane of the system exist and trajectories unable to cross the equatorial plane occur, contrary to the trajectories in the field of black holes where crossing the equatorial plane is always admitted. We concentrate our attention to the so called transmutation effect when the string loops are accelerated in the deep gravitational field near the black hole or naked singularity by transforming the oscillatory energy to the energy of the transitional motion. We demonstrate that the influence of the tidal charge can be substantial especially in the naked singularity spacetimes with b > 1 where the acceleration to ultrarelativistic velocities with Lorentz factor ? ? 100 can be reached, being more than one order higher in comparison with those obtained in the black hole spacetimes.

Stuchlík, Z.; Kološ, M., E-mail: zdenek.stuchlik@fpf.slu.cz, E-mail: martin.kolos@fpf.slu.cz [Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezru?ovo nám.13, CZ-74601 Opava (Czech Republic)

2012-10-01T23:59:59.000Z

204

Loop quantum gravity - a short review  

E-Print Network [OSTI]

In this article we review the foundations and the present status of loop quantum gravity. It is short and relatively non-technical, the emphasis is on the ideas, and the flavor of the techniques. In particular, we describe the kinematical quantization and the implementation of the Hamilton constraint, as well as the quantum theory of black hole horizons, semiclassical states, and matter propagation. Spin foam models and loop quantum cosmology are mentioned only in passing, as these will be covered in separate reviews to be published alongside this one.

Sahlmann, Hanno

2010-01-01T23:59:59.000Z

205

Non-standard loop quantum cosmology  

E-Print Network [OSTI]

We present results concerning the nature of the cosmological big bounce(BB) transition within the loop geometry underlying loop quantum cosmology (LQC). Our canonical quantization method is an alternative to the standard LQC. An evolution parameter we use has clear interpretation both at classical and quantum levels. The physical volume operator has discrete spectrum which is bounded from below. The minimum gap in the spectrum defines a quantum of the volume. The spectra of operators are parametrized by a free parameter to be determined.

Wlodzimierz Piechocki

2010-01-19T23:59:59.000Z

206

Automation of one-loop QCD corrections  

E-Print Network [OSTI]

We present the complete automation of the computation of one-loop QCD corrections, including UV renormalization, to an arbitrary scattering process in the Standard Model. This is achieved by embedding the OPP integrand reduction technique, as implemented in CutTools, into the MadGraph framework. By interfacing the tool so constructed, which we dub MadLoop, with MadFKS, the fully automatic computation of any infrared-safe observable at the next-to-leading order in QCD is attained. We demonstrate the flexibility and the reach of our method by calculating the production rates for a variety of processes at the 7 TeV LHC.

Valentin Hirschi; Rikkert Frederix; Stefano Frixione; Maria Vittoria Garzelli; Fabio Maltoni; Roberto Pittau

2011-03-03T23:59:59.000Z

207

Predictive control of a real-world Diesel engine using an extended online active set strategy  

Science Journals Connector (OSTI)

In order to meet tight emission limits Diesel engines are nowadays equipped with additional hardware components like an exhaust gas recirculation valve and a variable geometry turbocharger. Conventional engine control units use two SISO control loops to regulate the exhaust gas recirculation valve and the variable geometry turbocharger, although their effects are highly coupled. Moreover, these actuators are subject to physical constraints which seems to make an advanced control approach like model predictive control (MPC) the method of choice. In order to deal with MPC sampling times in the order of milliseconds, we employed an extension of the recently developed online active set strategy for controlling a real-world Diesel engine in a closed-loop manner. The results show that predictive engine control based on online optimisation can be accomplished in real-time – even on cheap controller hardware – and leads to increased controller performance.

Hans Joachim Ferreau; Peter Ortner; Peter Langthaler; Luigi del Re; Moritz Diehl

2007-01-01T23:59:59.000Z

208

Submitted to the Astrophysical Journal Emission measure distribution in loops impulsively heated at the  

E-Print Network [OSTI]

Submitted to the Astrophysical Journal Emission measure distribution in loops impulsively heated balance under the e#ects of steady heating, heat flux and radiative losses, with the magnetic field only by the evidence of sharply peaked emission measure distributions in active stars, and by the claims of isothermal

209

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

SciTech Connect (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

210

A Statistical Model of the Inhomogeneous Corona Constrained by Triple-Filter Measurements of Elementary Loop Strands with TRACE  

Science Journals Connector (OSTI)

Here we present the first quantitative model of the inhomogeneous solar corona, which we call the composite and elementary loops in a thermally inhomogeneous corona (CELTIC) model. We develop a self-consistent statistical model that quantifies the distributions of physical parameters, i.e., the distributions of loop widths, N(w,Te), electron densities, N(ne,Te), electron temperatures, N(Te), and statistical correlations between them. The parameterized distributions are constrained by the observed triple-filter fluxes of the EUV corona measured at some 18,000 loop positions with TRACE in the temperature range of Te ? 0.7-2.7 MK, as well as by the individual loop parameters (w,ne,Te) measured at these positions in ?240 detected loops, mostly sampled in active regions. The CELTIC model is inverted from the TRACE data and reproduces both the fluxes of the composite (active region and quiet Sun) background corona and the distributions of loop parameters in a self-consistent way. The best-fit values constrain a statistical correlation between the density and temperature, i.e., ne ? Te?, with ? = 0.9 ± 0.6, and between the loop width and temperature, i.e., w ? Te?, with ? = 1.3 ± 0.7, which can be related to the thermal pressure in a regime with a high plasma-? parameter. A possible explanation is a heating process located in the lower transition region or the upper chromosphere (e.g., as reproduced in the recent MHD simulations of Gudiksen and Nordlund), which produces sufficiently high electron densities, high plasma-? parameters, and thermally homogeneous loop cross sections as observed in elementary loop strands.

Markus J. Aschwanden; Richard W. Nightingale; Paul Boerner

2007-01-01T23:59:59.000Z

211

Wilson-Loop Symmetry Breaking Reexamined  

E-Print Network [OSTI]

The splitting in energy of gauge field vacua on the non-simply connected space $S^3/Z_2$ is reconsidered. We show the calculation to the one-loop level for a Yang-Mills vector with a ghost field. We confirm our previous result and give a solution to the question posed by Freire, Rom\\~ao and Barroso.

Atsushi Nakamula; Kiyoshi Shiraishi

2014-11-25T23:59:59.000Z

212

Parallel MATLAB at VT: Parallel For Loops  

E-Print Network [OSTI]

Parallel MATLAB at VT: Parallel For Loops John Burkardt (FSU) Gene Cliff (AOE/ICAM - ecliff Research Computing ICAM: Interdisciplinary Center for Applied Mathematics 1 / 72 #12;MATLAB Parallel Example ODE SWEEP Example FMINCON Example Conclusion 2 / 72 #12;INTRO: Parallel MATLAB Parallel MATLAB

Crawford, T. Daniel

213

Parallel MATLAB at VT: Parallel For Loops  

E-Print Network [OSTI]

Parallel MATLAB at VT: Parallel For Loops John Burkardt (FSU) Gene Cliff (AOE/ICAM - ecliff Research Computing ICAM: Interdisciplinary Center for Applied Mathematics 1 / 71 #12;MATLAB Parallel Example ODE SWEEP Example FMINCON Example Conclusion 2 / 71 #12;INTRO: Parallel MATLAB Parallel MATLAB

Crawford, T. Daniel

214

Parallel MATLAB at VT: Parallel For Loops  

E-Print Network [OSTI]

Parallel MATLAB at VT: Parallel For Loops John Burkardt (FSU) Gene Cliff (AOE/ICAM - ecliff Research Computing ICAM: Interdisciplinary Center for Applied Mathematics 1 / 56 #12;Matlab Parallel ODE SWEEP Example MD Example Conclusion 2 / 56 #12;INTRO: Parallel Matlab In a previous lecture we

Crawford, T. Daniel

215

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

216

One Loop Renormalization of Fermilab Fermions  

E-Print Network [OSTI]

We discuss the current status of our automatic perturbation theory program as applied to Fermilab Fermions. We give an overview of our methods, a discussion of tree level matching, and one loop results for the coefficients of the higher dimension kinetic operators.

Matthew Nobes; Howard Trottier

2002-09-02T23:59:59.000Z

217

Closing Rocky Flats by 2006  

SciTech Connect (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

218

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

219

Chemical looping combustion of coal in interconnected fluidized beds  

Science Journals Connector (OSTI)

Chemical looping combustion is the indirect combustion by use of oxygen carrier. It can...2...capture in power generating processes. In this paper, chemical looping combustion of coal in interconnected fluidized ...

LaiHong Shen; Min Zheng; Jun Xiao; Hui Zhang…

2007-04-01T23:59:59.000Z

220

Natural Ores as Oxygen Carriers in Chemical Looping Combustion  

Science Journals Connector (OSTI)

Natural Ores as Oxygen Carriers in Chemical Looping Combustion ... Chemical looping combustion (CLC) is a combustion technology that utilizes oxygen from oxygen carriers (OC), such as metal oxides, instead of air to combust fuels. ...

Hanjing Tian; Ranjani Siriwardane; Thomas Simonyi; James Poston

2013-01-02T23:59:59.000Z

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.


221

Prediction of short loops in intrinsically disordered proteins  

Science Journals Connector (OSTI)

A new possibility of predicting short disordered regions (loops) at a small window ... As demonstrated with the example of three G proteins, FoldUnfold predicted almost all existing loops at ... to determine the ...

E. I. Deryusheva; O. V. Galzitskaya; I. N. Serdyuk

2008-12-01T23:59:59.000Z

222

Thalamocortical Loops and Information Processing 2427 Thalamocortical Dysrhythmia  

E-Print Network [OSTI]

T Thalamocortical Loops and Information Processing 2427 Thalamocortical Dysrhythmia Synonyms TCD) the production of low-threshold calcium spike bursts by deinactiva- tion of calcium T-channels, discharging. Corticothalamic and Thalamocortical Interactions Thalamocortical Loops and Information Processing S. MURRAY

Sherman, S. Murray

223

DOE/NETL ADVANCED COMBUSTION SYSTEMS: CHEMICAL LOOPING SUMMARY  

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

-OSU-Coal%20Direct%20Chem%20Looping.pdf. Fan, L.-S., "Chemical Looping Systems for Fossil Energy Conversions," John Wiley & Sons, Inc., Hoboken, NJ, USA, October 2010. http:...

224

Breakout Session: Getting in the Loop: PV Hardware Recycling...  

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

Getting in the Loop: PV Hardware Recycling and Sustainability Breakout Session: Getting in the Loop: PV Hardware Recycling and Sustainability May 21, 2014 6:30PM to 7:30PM PDT...

225

Polyakov-loop suppression of colored states in a quark-meson-diquark plasma  

E-Print Network [OSTI]

A quark-meson-diquark plasma is considered within the PNJL model for dynamical chiral symmetry breaking and restoration in quark matter. Based on a generalized Beth-Uhlenbeck approach to mesons and diquarks we present the thermodynamics of this system including the Mott dissociation of mesons and diquarks at finite temperature. A striking result is the suppression of the diquark abundance below the chiral restoration temperature by the coupling to the Polyakov loop, because of their color degree of freedom. This is understood in close analogy to the suppression of quark distributions by the same mechanism. Mesons as color singlets are unaffected by the Polyakov-loop suppression. At temperatures above the chiral restoration mesons and diquarks are both suppressed due to the Mott effect, whereby the positive resonance contribution to the pressure is largely compensated by the negative scattering contribution in accordance with the Levinson theorem.

Blaschke, D; Buballa, M

2014-01-01T23:59:59.000Z

226

O(d,d) invariance at two and three loops  

Science Journals Connector (OSTI)

We show that in a two-dimensional ? model whose fields only depend on one target space coordinate, the O(d,d) invariance of the conformal invariance conditions observed at one loop is preserved at two loops (in the general case with torsion) and at three loops (in the case without torsion).

I. Jack and S. Parsons

2000-06-20T23:59:59.000Z

227

Molecular Cell R-Loop Formation Is a Distinctive Characteristic  

E-Print Network [OSTI]

Molecular Cell Article R-Loop Formation Is a Distinctive Characteristic of Unmethylated Human Cp of GC skew leads to the formation of long R loop structures. Furthermore, we show that GC skew and R, we provide evidence that R loop formation protects from DNMT3B1, the primary de novo DNA

Chédin, Frédéric

228

Nested Loop Algorithm for Parallel Model Based Iterative Reconstruction  

E-Print Network [OSTI]

Nested Loop Algorithm for Parallel Model Based Iterative Reconstruction Zhou Yu, Lin Fu, Debashish. In this paper, we propose a fast converging simultaneous-update algorithm using a nested loop structure tomography, iterative reconstruction, nested loop, preconditioner. I. INTRODUCTION Recent applications

229

Structure of an RNA Hairpin Loop with a 5‘-CGUUUCG-3‘ Loop Motif by Heteronuclear NMR Spectroscopy and Distance Geometry  

Science Journals Connector (OSTI)

Structural features of a 19-nucleotide RNA hairpin loop (5‘-GGCGUACGUUUCGUACGCC-3‘), a loop motif which occurs in eukaryotic 18S rRNA, have been derived using multidimensional heteronuclear NMR spectroscopy in combination with local conformational ...

Christian Sich; Oliver Ohlenschläger; Ramadurai Ramachandran; Matthias Görlach; Larry R. Brown

1997-11-18T23:59:59.000Z

230

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

231

Hanford Plant Closed Over Safety Violation  

Science Journals Connector (OSTI)

...421-a ELIOT MARSHALL Hanford plant closed over...conducting a highly public campaign for his...curriculum fell short of meeting his standards. 24...m JOHN WALSH Hanford Plant Closed Over...Violation Concern for public safety prompted the...least until the year 2000. Since there is...

ELIOT MARSHALL

1986-10-24T23:59:59.000Z

232

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

233

A SYSTEMATIC SURVEY OF HIGH-TEMPERATURE EMISSION IN SOLAR ACTIVE REGIONS  

SciTech Connect (OSTI)

The recent analysis of observations taken with the EUV Imaging Spectrometer and X-Ray Telescope instruments on Hinode suggests that well-constrained measurements of the temperature distribution in solar active regions can finally be made. Such measurements are critical for constraining theories of coronal heating. Past analysis, however, has suffered from limited sample sizes and large uncertainties at temperatures between 5 and 10 MK. Here we present a systematic study of the differential emission measure distribution in 15 active region cores. We focus on measurements in the 'inter-moss' region, that is, the region between the loop footpoints, where the observations are easier to interpret. To reduce the uncertainties at the highest temperatures we present a new method for isolating the Fe XVIII emission in the AIA/SDO 94 A channel. The resulting differential emission measure distributions confirm our previous analysis showing that the temperature distribution in an active region core is often strongly peaked near 4 MK. We characterize the properties of the emission distribution as a function of the total unsigned magnetic flux. We find that the amount of high-temperature emission in the active region core is correlated with the total unsigned magnetic flux, while the emission at lower temperatures, in contrast, is inversely related. These results provide compelling evidence that high-temperature active region emission is often close to equilibrium, although weaker active regions may be dominated by evolving million degree loops in the core.

Warren, Harry P. [Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States); Winebarger, Amy R. [NASA Marshall Space Flight Center, VP 62, Huntsville, AL 35812 (United States); Brooks, David H. [College of Science, George Mason University, 4400 University Drive, Fairfax, VA 22030 (United States)

2012-11-10T23:59:59.000Z

234

Factorized soft graviton theorems at loop level  

E-Print Network [OSTI]

We analyze the low-energy behavior of scattering amplitudes involving gravitons at loop level in four dimensions. The single-graviton soft limit is controlled by soft operators which have been argued to separate into a factorized piece and a non-factorizing infrared divergent contribution. In this note we show that the soft operators responsible for the factorized contributions are strongly constrained by gauge and Poincare invariance under the assumption of a local structure. We show that the leading and subleading orders in the soft-momentum expansion can not receive radiative corrections. The first radiative correction occurs for the sub-subleading soft graviton operator and is one-loop exact. It depends on only two undetermined coefficients which should reflect the field content of the theory under consideration.

Broedel, Johannes; Plefka, Jan; Rosso, Matteo

2014-01-01T23:59:59.000Z

235

Bimetallic Fe-Ni Oxygen Carriers for Chemical Looping Combustion  

SciTech Connect (OSTI)

The relative abundance, low cost, and low toxicity of iron make Fe-based oxygen carriers of great interest for chemical looping combustion (CLC), an emerging technology for clean and efficient combustion of fossil and renewable fuels. However, Fe also shows much lower reactivity than other metals (such as Ni and Cu). Here, we demonstrate strong improvement of Fe-based carriers by alloying the metal phase with Ni. Through a combination of carrier synthesis and characterization with thermogravimetric and fixed-bed reactor studies, we demonstrate that the addition of Ni results in a significant enhancement in activity as well as an increase in selectivity for total oxidation. Furthermore, comparing alumina and ceria as support materials highlights the fact that reducible supports can result in a strong increase in oxygen carrier utilization.

Bhavsar, Saurabh; Veser, Goetz

2013-11-06T23:59:59.000Z

236

Novel New Oxygen Carriers for Chemical Looping Combustion of Solid Fuels  

Science Journals Connector (OSTI)

Novel New Oxygen Carriers for Chemical Looping Combustion of Solid Fuels ... A loop of chem. ... Energy Combust. ...

Yueying Fan; Ranjani Siriwardane

2014-02-21T23:59:59.000Z

237

Energy Conversion Advanced Heat Transport Loop and Power Cycle  

SciTech Connect (OSTI)

The Department of Energy and the Idaho National Laboratory are developing a Next Generation Nuclear Plant (NGNP) to serve as a demonstration of state-of-the-art nuclear technology. The purpose of the demonstration is two fold 1) efficient low cost energy generation and 2) hydrogen production. Although a next generation plant could be developed as a single-purpose facility, early designs are expected to be dual-purpose. While hydrogen production and advanced energy cycles are still in its early stages of development, research towards coupling a high temperature reactor, electrical generation and hydrogen production is under way. Many aspects of the NGNP must be researched and developed in order to make recommendations on the final design of the plant. Parameters such as working conditions, cycle components, working fluids, and power conversion unit configurations must be understood. Three configurations of the power conversion unit were demonstrated in this study. A three-shaft design with 3 turbines and 4 compressors, a combined cycle with a Brayton top cycle and a Rankine bottoming cycle, and a reheated cycle with 3 stages of reheat were investigated. An intermediate heat transport loop for transporting process heat to a High Temperature Steam Electrolysis (HTSE) hydrogen production plant was used. Helium, CO2, and an 80% nitrogen, 20% helium mixture (by weight) were studied to determine the best working fluid in terms cycle efficiency and development cost. In each of these configurations the relative component size were estimated for the different working fluids. The relative size of the turbomachinery was measured by comparing the power input/output of the component. For heat exchangers the volume was computed and compared. Parametric studies away from the baseline values of the three-shaft and combined cycles were performed to determine the effect of varying conditions in the cycle. This gives some insight into the sensitivity of these cycles to various operating conditions as well as trade offs between efficiency and capital cost. Prametric studies were carried out on reactor outlet temperature, mass flow, pressure, and turbine cooling. Recommendations on the optimal working fluid for each configuration were made. A steady state model comparison was made with a Closed Brayton Cycle (CBC) power conversion system developed at Sandia National Laboratory (SNL). A preliminary model of the CBC was developed in HYSYS for comparison. Temperature and pressure ratio curves for the Capstone turbine and compressor developed at SNL were implemented into the HYSYS model. A comparison between the HYSYS model and SNL loop demonstrated power output predicted by HYSYS was much larger than that in the experiment. This was due to a lack of a model for the electrical alternator which was used to measure the power from the SNL loop. Further comparisons of the HYSYS model and the CBC data are recommended. Engineering analyses were performed for several configurations of the intermediate heat transport loop that transfers heat from the nuclear reactor to the hydrogen production plant. The analyses evaluated parallel and concentric piping arrangements and two different working fluids, including helium and a liquid salt. The thermal-hydraulic analyses determined the size and insulation requirements for the hot and cold leg pipes in the different configurations. Economic analyses were performed to estimate the cost of the va

Oh, C. H.

2006-08-01T23:59:59.000Z

238

Quantum interference from sums over closed paths for electrons on a three-dimensional lattice in a magnetic field: Total energy, magnetic moment, and orbital susceptibility  

E-Print Network [OSTI]

it travels around a closed loop enclosing a net flux . Our lattice path integral calculation enables us paths in a cubic lattice, each one with its corresponding magnetic phase factor representing the net quantities: the magnetic moment M(B) and orbital susceptibility (B) at half filling, as well as the zero

Nori, Franco

239

Closing_Language_Patent_Waiver_Grant_Cases.pdf | Department of...  

Office of Environmental Management (EM)

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

240

Predictive wavefront control for Adaptive Optics with arbitrary control loop delays  

SciTech Connect (OSTI)

We present a modification of the closed-loop state space model for AO control which allows delays that are a non-integer multiple of the system frame rate. We derive the new forms of the Predictive Fourier Control Kalman filters for arbitrary delays and show that they are linear combinations of the whole-frame delay terms. This structure of the controller is independent of the delay. System stability margins and residual error variance both transition gracefully between integer-frame delays.

Poyneer, L A; Veran, J

2007-10-30T23:59:59.000Z

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

How to use magnetic field information for coronal loop identification?  

E-Print Network [OSTI]

The structure of the solar corona is dominated by the magnetic field because the magnetic pressure is about four orders of magnitude higher than the plasma pressure. Due to the high conductivity the emitting coronal plasma (visible e.g. in SOHO/EIT) outlines the magnetic field lines. The gradient of the emitting plasma structures is significantly lower parallel to the magnetic field lines than in the perpendicular direction. Consequently information regarding the coronal magnetic field can be used for the interpretation of coronal plasma structures. We extrapolate the coronal magnetic field from photospheric magnetic field measurements into the corona. The extrapolation method depends on assumptions regarding coronal currents, e.g. potential fields (current free) or force-free fields (current parallel to magnetic field). As a next step we project the reconstructed 3D magnetic field lines on an EIT-image and compare with the emitting plasma structures. Coronal loops are identified as closed magnetic field lines with a high emissivity in EIT and a small gradient of the emissivity along the magnetic field.

T. Wiegelmann; B. Inhester; A. Lagg; S. K. Solanki

2008-01-30T23:59:59.000Z

242

tight_nuts_thehub closed_boot  

E-Print Network [OSTI]

tight_nuts_the­hub closed_boot in_jack_boot in_pump_boot in_wheel1_boot in_wrench_boot inflated_nuts_the­hub closed_boot in_jack_boot in_pump_boot in_wheel1_boot in_wrench_boot inflated_wheel2 on_wheel2_the­hub tight_nuts_the­hub closed_boot in_jack_boot in_pump_boot in_wheel1_boot in_wrench_boot inflated_wheel2

Murphy, Robert F.

243

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

244

Rahul Mangharam Highlights My research develops the foundations of Cyber-Physical Systems (CPS) through closed loop modeling,  

E-Print Network [OSTI]

and platforms. My work bridges scheduling theory and control systems for CPS. I Scheduling of Control Systems. I have developed a new class of scheduling for CPS in the scheduling scheme. This is used for coordinated control of building automation

Rajkumar, Ragunathan "Raj"

245

Dynamic Modeling and Control of Nuclear Reactors Coupled to Closed-Loop Brayton Cycle Systems using SIMULINK{sup TM}  

SciTech Connect (OSTI)

The operation of space reactors for both in-space and planetary operations will require unprecedented levels of autonomy and control. Development of these autonomous control systems will require dynamic system models, effective control methodologies, and autonomous control logic. This paper briefly describes the results of reactor, power-conversion, and control models that are implemented in SIMULINK{sup TM} (Simulink, 2004). SIMULINK{sup TM} is a development environment packaged with MatLab{sup TM} (MatLab, 2004) that allows the creation of dynamic state flow models. Simulation modules for liquid metal, gas cooled reactors, and electrically heated systems have been developed, as have modules for dynamic power-conversion components such as, ducting, heat exchangers, turbines, compressors, permanent magnet alternators, and load resistors. Various control modules for the reactor and the power-conversion shaft speed have also been developed and simulated. The modules are compiled into libraries and can be easily connected in different ways to explore the operational space of a number of potential reactor, power-conversion system configurations, and control approaches. The modularity and variability of these SIMULINK{sup TM} models provides a way to simulate a variety of complete power generation systems. To date, both Liquid Metal Reactors (LMR), Gas Cooled Reactors (GCR), and electric heaters that are coupled to gas-dynamics systems and thermoelectric systems have been simulated and are used to understand the behavior of these systems. Current efforts are focused on improving the fidelity of the existing SIMULINK{sup TM} modules, extending them to include isotopic heaters, heat pipes, Stirling engines, and on developing state flow logic to provide intelligent autonomy. The simulation code is called RPC-SIM (Reactor Power and Control-Simulator)

Wright, Steven A.; Sanchez, Travis [Sandia National Laboratories, Org 6872 MS-1146, PO Box 5800 Albuquerque, New Mexico 87185 (United States)

2005-02-06T23:59:59.000Z

246

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 the centrifugal forces necessary for separating the light from the heavy component. The resulting separation force) to keep the downstream pumps and compressors within a proper operating range (preventing e.g. cavitation

Van den Hof, Paul

247

Dynamics of the Coupled Human-climate System Resulting from Closed-loop Control of Solar Geoengineering  

SciTech Connect (OSTI)

If solar radiation management (SRM) were ever implemented, feedback of the observed climate state might be used to adjust the radiative forcing of SRM, in order to compensate for uncertainty in either the forcing or the climate response; this would also compensate for unexpected changes in the system, e.g. a nonlinear change in climate sensitivity. This feedback creates an emergent coupled human-climate system, with entirely new dynamics. In addition to the intended response to greenhouse-gas induced changes, the use of feedback would also result in a geoengineering response to natural climate variability. We use a simple box-diffusion dynamic model to understand how changing feedback-control parameters and time delay affect the behavior of this coupled natural-human system, and verify these predictions using the HadCM3L general circulation model. In particular, some amplification of natural variability is unavoidable; any time delay (e.g., to average out natural variability, or due to decision-making) exacerbates this amplification, with oscillatory behavior possible if there is a desire for rapid correction (high feedback gain), but a delayed response needed for decision making. Conversely, the need for feedback to compensate for uncertainty, combined with a desire to avoid excessive amplification, results in a limit on how rapidly SRM could respond to uncertain changes.

MacMartin, Douglas; Kravitz, Benjamin S.; Keith, David; Jarvis, Andrew

2014-07-08T23:59:59.000Z

248

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

SciTech Connect (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

249

Design of a precision grinder with closed loop optical feedback for the manufacture of micro electro discharge machining electrodes.  

E-Print Network [OSTI]

??This research focuses on the design of a precision grinder for the manufacture of electrodes used in micro-electro discharge machining (EDM). Electrodes used in micro-… (more)

Howe, Matthew Riga

2009-01-01T23:59:59.000Z

250

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

E-Print Network [OSTI]

N L g P ? ? ? ? ? ? ? ? ? (2.6) 17 ? ? 2 coso tab r rl N L g P ? ? ?? ?? ? ? ? ? (2.7) ?0 = permeability of air g = air gap length l = length of stator/rotor r = radius of stator/rotor Nt = number of turns of windings....9) The flux equations for the three stator and three rotor windings is given by abcs abcs abcs abcsr abcrL i L i? ? ? (2.10) abcr abcrs abcs abcr abcrL i L i? ? ? (2.11) The inductance matrices are obtained from (2.6) and (2.7) for Ns turns...

Meenakshi Sundaram, Vivek

2012-07-16T23:59:59.000Z

251

Modular Low Cost High Energy Exhaust Heat Thermoelectric Generator with Closed-Loop Exhaust By-Pass System  

Broader source: Energy.gov [DOE]

Poster presented at the 16th Directions in Engine-Efficiency and Emissions Research (DEER) Conference in Detroit, MI, September 27-30, 2010.

252

PARS II Process Document – DOE Period Close  

Broader source: Energy.gov [DOE]

This document details the process adopted by the Office of Acquisition and Project Management to prepare APM DepSec Monthly Status Report, finalize DOE close period package, and perform reporting...

253

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

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

254

Natural Ores as Oxygen Carriers in Chemical Looping Combustion  

SciTech Connect (OSTI)

Chemical looping combustion (CLC) is a combustion technology that utilizes oxygen from oxygen carriers (OC), such as metal oxides, instead of air to combust fuels. The use of natural minerals as oxygen carriers has advantages, such as lower cost and availability. Eight materials, based on copper or iron oxides, were selected for screening tests of CLC processes using coal and methane as fuels. Thermogravimetric experiments and bench-scale fixed-bed reactor tests were conducted to investigate the oxygen transfer capacity, reaction kinetics, and stability during cyclic reduction/oxidation reaction. Most natural minerals showed lower combustion capacity than pure CuO/Fe{sub 2}O{sub 3} due to low-concentrations of active oxide species in minerals. In coal CLC, chryscolla (Cu-based), magnetite, and limonite (Fe-based) demonstrated better reaction performances than other materials. The addition of steam improved the coal CLC performance when using natural ores because of the steam gasification of coal and the subsequent reaction of gaseous fuels with active oxide species in the natural ores. In methane CLC, chryscolla, hematite, and limonite demonstrated excellent reactivity and stability in 50-cycle thermogravimetric analysis tests. Fe{sub 2}O{sub 3}-based ores possess greater oxygen utilization but require an activation period before achieving full performance in methane CLC. Particle agglomeration issues associated with the application of natural ores in CLC processes were also studied by scanning electron microscopy (SEM).

Tian, Hanjing; Siriwardane, Ranjani; Simonyi, Thomas; Poston, James

2013-08-01T23:59:59.000Z

255

Thermoelectric power generator with intermediate loop  

DOE Patents [OSTI]

A thermoelectric power generator is disclosed for use to generate electrical power from heat, typically waste heat. An intermediate heat transfer loop forms a part of the system to permit added control and adjustability in the system. This allows the thermoelectric power generator to more effectively and efficiently generate power in the face of dynamically varying temperatures and heat flux conditions, such as where the heat source is the exhaust of an automobile, or any other heat source with dynamic temperature and heat flux conditions.

Bell, Lon E; Crane, Douglas Todd

2013-05-21T23:59:59.000Z

256

Thermoelectric power generator with intermediate loop  

DOE Patents [OSTI]

A thermoelectric power generator is disclosed for use to generate electrical power from heat, typically waste heat. An intermediate heat transfer loop forms a part of the system to permit added control and adjustability in the system. This allows the thermoelectric power generator to more effectively and efficiently generate power in the face of dynamically varying temperatures and heat flux conditions, such as where the heat source is the exhaust of an automobile, or any other heat source with dynamic temperature and heat flux conditions.

Bel,; Lon E. (Altadena, CA); Crane, Douglas Todd (Pasadena, CA)

2009-10-27T23:59:59.000Z

257

Chemical Looping Reforming for H2, CO and Syngas Production  

SciTech Connect (OSTI)

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

258

Variants of human thymidylate synthase with loop 181-197 stabilized in the inactive conformation.  

SciTech Connect (OSTI)

Loop 181-197 of human thymidylate synthase (hTS) populates two major conformations, essentially corresponding to the loop flipped by 180{sup o}. In one of the conformations, the catalytic Cys195 residue lies distant from the active site making the enzyme inactive. Ligands stabilizing this inactive conformation may function as allosteric inhibitors. To facilitate the search for such inhibitors, we have expressed and characterized several mutants designed to shift the equilibrium toward the inactive conformer. In most cases, the catalytic efficiency of the mutants was only somewhat impaired with values of k{sub cat}/K{sub m} reduced by factors in a 2-12 range. One of the mutants, M190K, is however unique in having the value of k{sub cat}/K{sub m} smaller by a factor of {approx}7500 than the wild type. The crystal structure of this mutant is similar to that of the wt hTS with loop 181-197 in the inactive conformation. However, the direct vicinity of the mutation, residues 188-194 of this loop, assumes a different conformation with the positions of C{sub {alpha}} shifted up to 7.2 {angstrom}. This affects region 116-128, which became ordered in M190K while it is disordered in wt. The conformation of 116-128 is however different than that observed in hTS in the active conformation. The side chain of Lys190 does not form contacts and is in solvent region. The very low activity of M190K as compared to another mutant with a charged residue in this position, M190E, suggests that the protein is trapped in an inactive state that does not equilibrate easily with the active conformer.

Lovelace, Leslie L.; Johnson, Saphronia R.; Gibson, Lydia M.; Bell, Brittnaie J.; Berger, Sondra H.; Lebioda, Lukasz; (SC)

2009-08-31T23:59:59.000Z

259

High temperature storage loop : final design report.  

SciTech Connect (OSTI)

A three year plan for thermal energy storage (TES) research was created at Sandia National Laboratories in the spring of 2012. This plan included a strategic goal of providing test capability for Sandia and for the nation in which to evaluate high temperature storage (>650%C2%B0C) technology. The plan was to scope, design, and build a flow loop that would be compatible with a multitude of high temperature heat transfer/storage fluids. The High Temperature Storage Loop (HTSL) would be reconfigurable so that it was useful for not only storage testing, but also for high temperature receiver testing and high efficiency power cycle testing as well. In that way, HTSL was part of a much larger strategy for Sandia to provide a research and testing platform that would be integral for the evaluation of individual technologies funded under the SunShot program. DOE's SunShot program seeks to reduce the price of solar technologies to 6/kWhr to be cost competitive with carbon-based fuels. The HTSL project sought to provide evaluation capability for these SunShot supported technologies. This report includes the scoping, design, and budgetary costing aspects of this effort

Gill, David Dennis; Kolb, William J.

2013-07-01T23:59:59.000Z

260

A STATE VARIABLE DESCRIPTION OF THE RHIC RF CONTROL LOOPS.  

SciTech Connect (OSTI)

The beam transfer function changes during the RHIC ramp. The response of the RF control loops changes as a result. A state-variable description of the beam and the RF control loops was developed. This description was used to generate a set of feedback matrices that keeps the response of the RF control loops constant during the ramp. This paper describes the state-variable description and its use in determining the K matrices.

SCHULTHEISS,C.; BRENNAN,J.M.

2002-06-02T23:59:59.000Z

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.


261

Mercury Release and Speciation in Chemical Looping Combustion of Coal  

Science Journals Connector (OSTI)

Mercury Release and Speciation in Chemical Looping Combustion of Coal ... In the in situ Gasification Chemical Looping Combustion of coal (iG-CLC), the fuel is gasified in situ in the fuel reactor and gasification products are converted to CO2 and H2O by reaction with the oxygen carrier. ... This work is the first study on mercury release in Chemical Looping Combustion of coal. ...

T. Mendiara; M. T. Izquierdo; A. Abad; P. Gayán; F. García-Labiano; L. F. de Diego; J. Adánez

2014-03-06T23:59:59.000Z

262

Spin and orbital magnetization loops obtained using magnetic Compton scattering  

SciTech Connect (OSTI)

We present an application of magnetic Compton scattering (MCS) to decompose a total magnetization loop into spin and orbital magnetization contributions. A spin magnetization loop of SmAl{sub 2} was measured by recording the intensity of magnetic Compton scattering as a function of applied magnetic field. Comparing the spin magnetization loop with the total magnetization one measured by a vibrating sample magnetometer, the orbital magnetization loop was obtained. The data display an anti-coupled behavior between the spin and orbital magnetizations and confirm that the orbital part dominates the magnetization.

Itou, M.; Sakurai, Y. [Japan Synchrotron Radiation Research Institute, SPring-8, Hyogo 679-5198 (Japan)] [Japan Synchrotron Radiation Research Institute, SPring-8, Hyogo 679-5198 (Japan); Koizumi, A. [Graduate School of Materials Science, University of Hyogo, Hyogo 678-1297 (Japan)] [Graduate School of Materials Science, University of Hyogo, Hyogo 678-1297 (Japan)

2013-02-25T23:59:59.000Z

263

Exhaust Aftertreatment and Low Pressure Loop EGR Applied to an...  

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

Loop EGR Applied to an Off-Highway Engine Project Director- Kirby Baumgard John Deere Power Systems DOE Project Officer- Steve Cooke Subcontract with Michigan Tech August 21...

264

Concept development of rotating bed chemical looping combustion reactor:.  

E-Print Network [OSTI]

??In this research a new rotary chemical looping combustion (CLC) reactor was developed which is suitable for larger scales and solves some of the issues… (more)

Hermans, C.W.M.

2013-01-01T23:59:59.000Z

265

Chemical-Looping Combustion With Gaseous Fuels: Thermodynamic Parametric Modeling  

Science Journals Connector (OSTI)

This communication reports the thermodynamic equilibrium analysis of the reactions involved in a chemical-looping combustion (CLC) process using methane, ethane and ... energy minimization technique determining t...

Mohammad M. Hossain

2014-05-01T23:59:59.000Z

266

Oxygen Carriers for Solid Fuel Chemical Looping Combustion Process...  

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

Oxygen Carriers for Solid Fuel Chemical Looping Combustion Process Regenerable Mixed Copper-Iron-Inert Support Oxygen Carriers National Energy Technology Laboratory Contact NETL...

267

Chemical Looping Combustion Cold Flow Model commissioning and performance evaluation.  

E-Print Network [OSTI]

?? SINTEF and NTNU are planning to build a 150 kWth Chemical Looping Combustion (CLC) reactor system. This is new technology and the CLC reactor… (more)

Tjøstheim, Sindre

2010-01-01T23:59:59.000Z

268

Experimental characterization and chemical kinetics study of chemical looping combustion .  

E-Print Network [OSTI]

??Chemical looping combustion (CLC) is one of the most promising technologies to achieve carbon capture in fossil fuel power generation plants. A novel rotary-bed reactor… (more)

Chen, Tianjiao, S.M. Massachusetts Institute of Technology

2014-01-01T23:59:59.000Z

269

Design of State-based Schedulers for a Network of Control Loops  

E-Print Network [OSTI]

For a closed-loop system, which has a contention-based multiple access network on its sensor link, the Medium Access Controller (MAC) may discard some packets when the traffic on the link is high. We use a local state-based scheduler to select a few critical data packets to send to the MAC. In this paper, we analyze the impact of such a scheduler on the closed-loop system in the presence of traffic, and show that there is a dual effect with state-based scheduling. In general, this makes the optimal scheduler and controller hard to find. However, by removing past controls from the scheduling criterion, we find that certainty equivalence holds. This condition is related to the classical result of Bar-Shalom and Tse, and it leads to the design of a scheduler with a certainty equivalent controller. This design, however, does not result in an equivalent system to the original problem, in the sense of Witsenhausen. Computing the estimate is difficult, but can be simplified by introducing a symmetry constraint on th...

Ramesh, Chithrupa; Johansson, Karl H

2012-01-01T23:59:59.000Z

270

Dismantling of Loop-Type Channel Equipment of MR Reactor in NRC 'Kurchatov Institute' - 13040  

SciTech Connect (OSTI)

In 2009 the project of decommissioning of MR and RTF reactors was developed and approved by the Expert Authority of the Russian Federation (Gosexpertiza). The main objective of the decommissioning works identified in this project: - complete dismantling of reactor equipment and systems; - decontamination of reactor premises and site in accordance with the established sanitary and hygienic standards. At the preparatory stage (2008-2010) of the project the following works were executed: loop-type channels' dismantling in the storage pool; experimental fuel assemblies' removal from spent fuel repositories in the central hall; spent fuel assembly removal from the liquid-metal-cooled loop-type channel of the reactor core and its placement into the SNF repository; and reconstruction of engineering support systems to the extent necessary for reactor decommissioning. The project assumes three main phases of dismantling and decontamination: - dismantling of equipment/pipelines of cooling circuits and loop-type channels, and auxiliary reactor equipment (2011-2012); - dismantling of equipment in underground reactor premises and of both MR and RTF in-vessel devices (2013-2014); - decontamination of reactor premises; rehabilitation of the reactor site; final radiation survey of reactor premises, loop-type channels and site; and issuance of the regulatory authorities' de-registration statement (2015). In 2011 the decommissioning license for the two reactors was received and direct MR decommissioning activities started. MR primary pipelines and loop-type facilities situated in the underground reactor hall were dismantled. Works were also launched to dismantle the loop-type channels' equipment in underground reactor premises; reactor buildings were reconstructed to allow removal of dismantled equipment; and the MR/RTF decommissioning sequence was identified. In autumn 2011 - spring 2012 results of dismantling activities performed are: - equipment from underground rooms (No. 66, 66A, 66B, 72, 64, 63) - as well as from water and gas loop corridors - was dismantled, with the total radwaste weight of 53 tons and the total removed activity of 5,0 x 10{sup 10} Bq; - loop-type channel equipment from underground reactor hall premises was dismantled; - 93 loop-type channels were characterized, chopped and removed, with radwaste of 2.6 x 10{sup 13} Bq ({sup 60}Co) and 1.5 x 10{sup 13} Bq ({sup 137}Cs) total activity removed from the reactor pool, fragmented and packaged. Some of this waste was placed into the high-level waste (HLW) repository of the Center. Dismantling works were executed with application of remotely operated mechanisms, which promoted decrease of radiation impact on the personnel. The average individual dose for the personnel was 1.9 mSv/year in 2011, and the collective dose is estimated as 0.0605 man x Sv/year. (authors)

Volkov, Victor; Danilovich, Alexey; Zverkov, Yuri; Ivanov, Oleg; Kolyadin, Vyacheslav; Lemus, Alexey; Pavlenko, Vitaly; Semenov, Sergey; Fadin, Sergey; Shisha, Anatoly; Chesnokov, Alexander [National Research Centre 'Kurchatov Institute', Moscow (Russian Federation)] [National Research Centre 'Kurchatov Institute', Moscow (Russian Federation)

2013-07-01T23:59:59.000Z

271

Strategic Need for Multi-Purpose Thermal Hydraulic Loop for Support of Advanced Reactor Technologies  

SciTech Connect (OSTI)

This report presents a conceptual design for a new high-temperature multi fluid, multi loop test facility for the INL to support thermal hydraulic, materials, and thermal energy storage research for nuclear and nuclear-hybrid applications. In its initial configuration, the facility will include a high-temperature helium loop, a liquid salt loop, and a hot water/steam loop. The three loops will be thermally coupled through an intermediate heat exchanger (IHX) and a secondary heat exchanger (SHX). Research topics to be addressed with this facility include the characterization and performance evaluation of candidate compact heat exchangers such as printed circuit heat exchangers (PCHEs) at prototypical operating conditions, flow and heat transfer issues related to core thermal hydraulics in advanced helium-cooled and salt-cooled reactors, and evaluation of corrosion behavior of new cladding materials and accident-tolerant fuels for LWRs at prototypical conditions. Based on its relevance to advanced reactor systems, the new facility has been named the Advanced Reactor Technology Integral System Test (ARTIST) facility. Research performed in this facility will advance the state of the art and technology readiness level of high temperature intermediate heat exchangers (IHXs) for nuclear applications while establishing the INL as a center of excellence for the development and certification of this technology. The thermal energy storage capability will support research and demonstration activities related to process heat delivery for a variety of hybrid energy systems and grid stabilization strategies. Experimental results obtained from this research will assist in development of reliable predictive models for thermal hydraulic design and safety codes over the range of expected advanced reactor operating conditions. Proposed/existing IHX heat transfer and friction correlations and criteria will be assessed with information on materials compatibility and instrumentation needs. The experimental database will guide development of appropriate predictive methods and be available for code verification and validation (V&V) related to these systems.

James E. O'Brien; Piyush Sabharwall; Su-Jong Yoon; Gregory K. Housley

2014-09-01T23:59:59.000Z

272

Photo Contest Closing date 2013 9 19  

E-Print Network [OSTI]

2013 About Photo Contest Closing date 2013 9 19 Photo Contest Eligibility International) (8MB ) By E-Mail (Maximum size 8MB per photo, up to 2 photos) kisc-koryu@edu.kobe-u.ac.jp 2) CD-R () By Post or submit by hand to KISC Photos (up to 2 photos) burned on a CD-R. Note that your data

Banbara, Mutsunori

273

Geothermal Loop Experimental Facility. Final report  

SciTech Connect (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

274

Massive Nonplanar Two-Loop Maximal Unitarity  

E-Print Network [OSTI]

We explore maximal unitarity for nonplanar two-loop integrals with up to four massive external legs. In this framework, the amplitude is reduced to a basis of master integrals whose coefficients are extracted from maximal cuts. The hepta-cut of the nonplanar double box defines a nodal algebraic curve associated with a multiply pinched genus-3 Riemann surface. All possible configurations of external masses are covered by two distinct topological pictures in which the curve decomposes into either six or eight Riemann spheres. The procedure relies on consistency equations based on vanishing of integrals of total derivatives and Levi-Civita contractions. Our analysis indicates that these constraints are governed by the global structure of the maximal cut. Lastly, we present an algorithm for computing generalized cuts of massive integrals with higher powers of propagators based on the Bezoutian matrix method.

Mads Sogaard; Yang Zhang

2014-06-19T23:59:59.000Z

275

SIMPLE, FULLY FEATURED BOILER LOOP MODELLING  

E-Print Network [OSTI]

The performance of hot water space heating systems for mild to warm temperate climates is dominated by the efficiency of boiler operation at low load (i.e. below 25 % of nameplate capacity). This efficiency is influenced by a number of effects that are poorly represented in common modelling approaches, including static thermal losses from the boiler and distribution system, changes in burner efficiency at different firing rates, thermal inertia in the boiler loop and the effects of cyclic operation. In this paper, a simple model that includes these loss mechanisms is developed. An example from an actual project is used to demonstrate that addressing the full range of low-load efficiency effects can increase predicted boiler gas consumption substantially relative to standard simulation approaches.

Erica Kenna; Paul Bannister

276

Gas Test Loop Facilities Alternatives Assessment Report Rev 1  

SciTech Connect (OSTI)

An important task in the Gas Test Loop (GTL) conceptual design was to determine the best facility to serve as host for this apparatus, which will allow fast-flux neutron testing in an existing nuclear facility. A survey was undertaken of domestic and foreign nuclear reactors and accelerator facilities to arrive at that determination. Two major research reactors in the U.S. were considered in detail, the Advanced Test Reactor (ATR) and the High Flux Isotope Reactor (HFIR), each with sufficient power to attain the required neutron fluxes. HFIR routinely operates near its design power limit of 100 MW. ATR has traditionally operated at less than half its design power limit of 250 MW. Both of these reactors should be available for at least the next 30 years. The other major U.S. research reactor, the Missouri University Research Reactor, does not have sufficient power to reach the required neutron flux nor do the smaller research reactors. Of the foreign reactors investigated, BOR-60 is perhaps the most attractive. Monju and BN 600 are power reactors for their respective electrical grids. Although the Joyo reactor is vigorously campaigning for customers, local laws regarding transport of radioactive material mean it would be very difficult to retrieve test articles from either Japanese reactor for post irradiation examination. PHENIX is scheduled to close in 2008 and is fully booked until then. FBTR is limited to domestic (Indian) users only. Data quality is often suspect in Russia. The only accelerator seriously considered was the Fuel and Material Test Station (FMTS) currently proposed for operation at Los Alamos National Laboratory. The neutron spectrum in FMTS is similar to that found in a fast reactor, but it has a pronounced high-energy tail that is atypical of fast fission reactor spectra. First irradiation in the FMTS is being contemplated for 2008. Detailed review of these facilities resulted in the recommendation that the ATR would be the best host for the GTL.

William J. Skerjanc; William F. Skerjanc

2005-07-01T23:59:59.000Z

277

Affine Nested Loop Programs and their Binary Parameterized Dataflow Graph Counterparts  

E-Print Network [OSTI]

Affine Nested Loop Programs and their Binary Parameterized Dataflow Graph Counterparts Ed F Parameterized static affine nested loop programs can be automatically converted to input-output equivalent Kahn affine nested loop programs which are nested loop programs in which the loop boundaries, the conditions

Bhattacharyya, Shuvra S.

278

Tiling Imperfectly-nested Loop Nests Nawaaz Ahmed, Nikolay Mateev and Keshav Pingali,  

E-Print Network [OSTI]

Tiling Imperfectly-nested Loop Nests Nawaaz Ahmed, Nikolay Mateev and Keshav Pingali, Department the effect of interleaving iterations of these loops. Tiling of perfectly-nested loop nests (which are loop nests in which all assignment statements are contained in the innermost loop) is well understood

Pingali, Keshav K.

279

From a closed piecewise geodesic to a constriction on a closed triangulated Franck Hetroy, Dominique Attali  

E-Print Network [OSTI]

From a closed piecewise geodesic to a constriction on a closed triangulated surface Franck H. In particular, con- strictions are periodic geodesics. We use constrictions in order to segment objects. In [4], we proposed an ap- proach based on progressive surface simplification and local geodesic computation

Paris-Sud XI, Université de

280

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

SciTech Connect (OSTI)

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

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

Levels and loops: the future of artificial intelligence and neuroscience  

Science Journals Connector (OSTI)

...with the perceptual-motor loop of a robot in a...sensory perceptions and motor actions in an environment...perception, on sensory^motor coordinate systems...Levels and loops: the future ofarti cial intelligence...which relativity and quantum mechanics are our best...

1999-01-01T23:59:59.000Z

282

Intercommutation of Z-boson string loops violates baryon number  

Science Journals Connector (OSTI)

We show that delinking of Z-boson string loops changes the helicity and thus violates baryon number. The key point is that an unlinked vortex loop cannot be twisted. The helicity of an eventual magnetic twist when averaged in time is zero.

Jacek Dziarmaga

1995-07-15T23:59:59.000Z

283

Analysis of heat transfer in unlooped and looped pulsating  

E-Print Network [OSTI]

Analysis of heat transfer in unlooped and looped pulsating heat pipes M.B. Sha®i and A. Faghri of Mechnical Engineering, New Mexico State University, Las Cruces, USA Keywords Heat transfer, Condensation, Tubing Abstract An advanced heat transfer model for both unlooped and looped Pulsating Heat Pipes (PHPs

Zhang, Yuwen

284

Exploring the Energy Landscapes of Flexible Molecular Loops using  

E-Print Network [OSTI]

in Dynamical Systems and also applied to Robotics, provide efficient algorithms to trace out implicitly defined molecular loops. These tools produce an atlas composed by coordinated charts that parametrize the conformational space. The atlas captures the structure of this space, which determines the motion of the loop

Porta, Josep M.

285

Robust Multi-loop Airborne SLAM in Unknown Wind Environments  

E-Print Network [OSTI]

Robust Multi-loop Airborne SLAM in Unknown Wind Environments Jonghyuk Kim Department of Engineering for Autonomous Systems University of Sydney, Australia Email: salah@acfr.usyd.edu.au Abstract-- This paper presents a robust multi-loop airborne SLAM structure which also augments wind information. The air velocity

Kim, Jonghyuk "Jon"

286

Loop Effects in AdS/CFT and Beyond  

Science Journals Connector (OSTI)

......Loop Effects in AdS/CFT and Beyond 37 at the classical level, it does break conformal invariance at the level of the propa- gator. Anticipating slightly, we see that there should be a one-loop contribution to the supergravity action which similarly breaks......

Steven S. Gubser

2003-06-01T23:59:59.000Z

287

The nested simple conformal loop ensembles in the Riemann sphere  

E-Print Network [OSTI]

Simple conformal loop ensembles (CLE) are a class of random collection of simple non-intersecting loops that are of particular interest in the study of conformally invariant systems. Among other things related to these CLEs, we prove the invariance in distribution of their nested "full-plane" versions under the inversion $z \\mapsto 1/z$.

Antti Kemppainen; Wendelin Werner

2014-05-23T23:59:59.000Z

288

E-Print Network 3.0 - activating integrin alphavbeta3 Sample...  

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

123, 146. Together, these studies suggest that actin dynamics actively induce heart tube looping... , and integrins, respectively. The cytoskeleton remodels its architecture with...

289

Modelling Rates of Gasification of a Char Particle in Chemical Looping Combustion  

E-Print Network [OSTI]

, m 2 s-1 Deq Effective diffusivity in a fluidised bed = Dm?mf, m 2 s-1 Dm Constant mean diffusivity, m 2 s-1 Ej Activation energy for the rate constant j, kJ mol -1 f(X) Relative change in the surface area available for reaction over conversion... when gasification with CO2 was undertaken in a fluidised bed of either (i) an active Fe-based oxygen carrier used for chemical looping or (ii) inert sand. The kinetics of the gasification were found to be significantly faster in the presence...

Saucedo, Marco A.; Dennis, John S.; Scott, Stuart A.

2014-07-15T23:59:59.000Z

290

Solid looping cycles: A new technology for coal conversion  

SciTech Connect (OSTI)

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

291

Control and optimization system and method for chemical looping processes  

DOE Patents [OSTI]

A control system for optimizing a chemical loop system includes one or more sensors for measuring one or more parameters in a chemical loop. The sensors are disposed on or in a conduit positioned in the chemical loop. The sensors generate one or more data signals representative of an amount of solids in the conduit. The control system includes a data acquisition system in communication with the sensors and a controller in communication with the data acquisition system. The data acquisition system receives the data signals and the controller generates the control signals. The controller is in communication with one or more valves positioned in the chemical loop. The valves are configured to regulate a flow of the solids through the chemical loop.

Lou, Xinsheng; Joshi, Abhinaya; Lei, Hao

2014-06-24T23:59:59.000Z

292

Effects of inflation on a cosmic string loop population  

SciTech Connect (OSTI)

We study the evolution of simple cosmic string loop solutions in an inflationary universe. We show, for the particular case of circular loops, that periodic solutions do exist in a de Sitter universe, below a critical loop radius R{sub c}H=1/2. On the other hand, larger loops freeze in comoving coordinates, and we explicitly show that they can survive more e-foldings of inflation than pointlike objects. We discuss the implications of these findings for the survival of realistic cosmic string loops during inflation and for the general characteristics of post-inflationary cosmic string networks. We also consider the analogous solutions for domain walls, in which case the critical radius is R{sub c}H=2/3.

Avelino, P. P. [Centro de Fisica do Porto, Rua do Campo Alegre 687, 4169-007 Porto (Portugal); Departamento de Fisica da Faculdade de Ciencias da Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto (Portugal); Martins, C. J. A. P. [Centro de Fisica do Porto, Rua do Campo Alegre 687, 4169-007 Porto (Portugal); Department of Applied Mathematics and Theoretical Physics, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA (United Kingdom); Shellard, E. P. S. [Department of Applied Mathematics and Theoretical Physics, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA (United Kingdom)

2007-10-15T23:59:59.000Z

293

Case Closed on Nauru Island Effect  

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

294

Closed inflationary universe in patch cosmology  

SciTech Connect (OSTI)

In this paper, we study closed inflationary universe models using the Gauss-Bonnet Brane. We determine and characterize the existence of a universe with {omega}>1, with an appropriate period of inflation. We have found that this model is less restrictive in comparison with the standard approach where a scalar field is considered. We use recent astronomical observations to constrain the parameters appearing in the model.

Campo, Sergio del [Instituto de Fisica, Pontificia Universidad Catolica de Valparaiso, Avenida Brasil 2950, Casilla 4059, Valparaiso (Chile)], E-mail: sdelcamp@ucv.cl; Herrera, Ramon [Instituto de Fisica, Pontificia Universidad Catolica de Valparaiso, Avenida Brasil 2950, Casilla 4059, Valparaiso (Chile)], E-mail: ramon.herrera@ucv.cl; Saavedra, Joel [Instituto de Fisica, Pontificia Universidad Catolica de Valparaiso, Avenida Brasil 2950, Casilla 4059, Valparaiso (Chile)], E-mail: joel.saavedra@ucv.cl; Labrana, Pedro [Departamento de Fisica, Universidad del BioBio, Avenida Collao 1202, Casilla 5-C, Concepcion (Chile)], E-mail: plabrana@ubiobio.cl

2009-09-15T23:59:59.000Z

295

Status Update: Closing Rocky Flats by 2006  

SciTech Connect (OSTI)

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

296

An algorithm for automatic detection of loop indices for communication overlapping  

Science Journals Connector (OSTI)

This paper presents a compiler algorithm that automatically detects the appropriate loop indices of a given nested loop and applies loop interchange and tiling in order to overlap communication with computatio...

Kazuaki Ishizaki; Hideaki Komatsu; Toshio Nakatani

1997-01-01T23:59:59.000Z

297

Chemical Looping Combustion Reactions and Systems  

SciTech Connect (OSTI)

Chemical Looping Combustion (CLC) is one promising fuel-combustion technology, which can facilitate economic CO{sub 2} capture in coal-fired power plants. It employs the oxidation/reduction characteristics of a metal, or oxygen carrier, and its oxide, the oxidizing gas (typically air) and the fuel source may be kept separate. This topical report discusses the results of four complementary efforts: (5.1) the development of process and economic models to optimize important design considerations, such as oxygen carrier circulation rate, temperature, residence time; (5.2) the development of high-performance simulation capabilities for fluidized beds and the collection, parameter identification, and preliminary verification/uncertainty quantification; (5.3) the exploration of operating characteristics in the laboratoryscale bubbling bed reactor, with a focus on the oxygen carrier performance, including reactivity, oxygen carrying capacity, attrition resistance, resistance to deactivation, cost and availability; and (5.4) the identification of kinetic data for copper-based oxygen carriers as well as the development and analysis of supported copper oxygen carrier material. Subtask 5.1 focused on the development of kinetic expressions for the Chemical Looping with Oxygen Uncoupling (CLOU) process and validating them with reported literature data. The kinetic expressions were incorporated into a process model for determination of reactor size and oxygen carrier circulation for the CLOU process using ASPEN PLUS. An ASPEN PLUS process model was also developed using literature data for the CLC process employing an iron-based oxygen carrier, and the results of the process model have been utilized to perform a relative economic comparison. In Subtask 5.2, the investigators studied the trade-off between modeling approaches and available simulations tools. They quantified uncertainty in the high-performance computing (HPC) simulation tools for CLC bed applications. Furthermore, they performed a sensitivity analysis for velocity, height and polydispersity and compared results against literature data for experimental studies of CLC beds with no reaction. Finally, they present an optimization space using simple non-reactive configurations. In Subtask 5.3, through a series of experimental studies, behavior of a variety of oxygen carriers with different loadings and manufacturing techniques was evaluated under both oxidizing and reducing conditions. The influences of temperature, degree of carrier conversion and thermodynamic driving force resulting from the difference between equilibrium and system O{sub 2} partial pressures were evaluated through several experimental campaigns, and generalized models accounting for these influences were developed to describe oxidation and oxygen release. Conversion of three solid fuels with widely ranging reactivities was studied in a small fluidized bed system, and all but the least reactive fuel (petcoke) were rapidly converted by oxygen liberated from the CLOU carrier. Attrition propensity of a variety of carriers was also studied, and the carriers produced by freeze granulation or impregnation of preformed substrates displayed the lowest rates of attrition. Subtask 5.4 focused on gathering kinetic data for a copper-based oxygen carrier to assist with modeling of a functioning chemical looping reactor. The kinetics team was also responsible for the development and analysis of supported copper oxygen carrier material.

Sarofim, Adel; Lighty, JoAnn; Smith, Philip; Whitty, Kevin; Eyring, Edward; Sahir, Asad; Alvarez, Milo; Hradisky, Michael; Clayton, Chris; Konya, Gabor; Baracki, Richard; Kelly, Kerry

2014-03-01T23:59:59.000Z

298

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

Office of Environmental Management (EM)

by the Office of Acquisition and Project Management to prepare APM DepSec Monthly Status Report, finalize DOE close period package, and perform reporting period close...

299

Collaborative Lubricating Oil Study on Emissions (CLOSE) Project...  

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

Collaborative Lubricating Oil Study on Emissions (CLOSE) Project Collaborative Lubricating Oil Study on Emissions (CLOSE) Project Extensive chemical and physical characterization...

300

DOPPLER SHIFTS IN ACTIVE REGION MOSS USING SOHO/SUMER  

SciTech Connect (OSTI)

The velocity of the plasma at the footpoint of hot loops in active region cores can be used to discriminate between different heating frequencies. Velocities on the order of a few kilometers per second would indicate low-frequency heating on sub-resolution strands, while velocities close to zero would indicate high-frequency (steady) heating. To discriminate between these two values requires accurate velocity measurements; previous velocity measurements suffer from large uncertainties, mainly due to the lack of an absolute wavelength reference scale. In this paper, we determine the velocity in the loop footpoints using observations from Solar Ultraviolet Measurements of Emitted Radiation (SUMER) on Solar and Heliospheric Observatory. We use neutral spectral lines to determine the wavelength scale of the observations with an uncertainty in the absolute velocity of <3.5 km s{sup -1} and co-aligned Transition Region and Coronal Explorer (TRACE) images to identify footpoint regions. We studied three different active regions and found average redshifts in the Ne VIII 770 A emission line (formed at 6 Multiplication-Sign 10{sup 5} K) of 5.17 {+-} 5.37 km s{sup -1} and average redshifts in the C IV 1548 and 1550 A emission lines (formed at 1 Multiplication-Sign 10{sup 5} K) of 13.94 {+-} 4.93 km s{sup -1} and 14.91 {+-} 6.09 km s{sup -1}, respectively. We find no correlation between the brightness in the spectral line and the measured velocity, nor do we find correlation between the Ne VIII and C IV velocities measured co-spatially and co-temporally. SUMER scanned two of the active regions twice; in those active regions we find positive correlation between the co-spatial velocities measured during the first and second scans. These results provide definitive and quantitative measurements for comparisons with simulations of different coronal heating mechanisms.

Winebarger, Amy [NASA Marshall Space Flight Center, VP 62, Huntsville, AL 35812 (United States); 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)

2013-04-20T23:59:59.000Z

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.


301

Double-winding Wilson loops and monopole confinement mechanisms  

E-Print Network [OSTI]

We consider "double-winding" Wilson loops in SU(2) gauge theory. These are contours which wind once around a loop $C_1$ and once around a loop $C_2$, where the two co-planar loops share one point in common, and where $C_1$ lies entirely in (or is displaced slightly from) the minimal area of $C_2$. We discuss the expectation value of such double-winding loops in abelian confinement pictures, where the spatial distribution of confining abelian fields is controlled by either a monopole Coulomb gas, a caloron ensemble, or a dual abelian Higgs model, and argue that in such models an exponential falloff in the sum of areas $A_1+A_2$ is expected. In contrast, in a center vortex model of confinement, the behavior is an exponential falloff in the difference of areas $A_2-A_1$. We compute such double-winding loops by lattice Monte Carlo simulation, and find that the area law falloff follows a difference-in-areas law. The conclusion is that even if confining gluonic field fluctuations are, in some gauge, mainly abelian in character, the spatial distribution of those abelian fields cannot be the distribution predicted by the simple monopole gas, caloron ensemble, or dual abelian Higgs actions, which have been used in the past to explain the area law falloff of Wilson loops.

Jeff Greensite; Roman Höllwieser

2014-11-19T23:59:59.000Z

302

Instability of single-phase natural circulation under multiple loops  

SciTech Connect (OSTI)

Natural circulation loop passively conveys heat from heat sources to heat sinks without mechanical pump. Various plants have natural circulation systems, e.g., solar heaters, Light Water Reactor (LWR) and Liquid Metal Fast Breeder Reactor (LMFBR). The core of LMFBR is cooled by forced convection of single-phase liquid sodium in normal operation. After the accident, the decay heat of the core is designed to be cooled by the natural circulation of the liquid sodium. The natural circulation cooling is very important from a viewpoint of passive safety concept. Here, the natural circulation in single loop system had been studied by many researchers. In a multiple loop system, the instability of natural circulation was more complicated because of the interaction between the loops. In this study, the effects of the multiple loop on the natural circulation instability were investigated numerically. The multiple loops system with one heating tube and two cooling tubes were evaluated. The one-dimensional energy and momentum equations were solved using Finite Difference Method. The flow regimes of the instability were evaluated with varying the heat flux. In multiple loop system, the observed flow was classified into five regimes including chaotic regime. The flow regimes were qualitatively explained by the stability of the attractor in the phase space.

Satoh, A.; Okamoto, K.; Madarame, H. [Univ. of Tokyo, Tokai, Ibaraki (Japan). Nuclear Engineering Research Lab.

1996-08-01T23:59:59.000Z

303

Program permits fast solution to pipeline loop requirements  

SciTech Connect (OSTI)

A program developed for the HP-41CV hand-held calculator can provide pipeline engineers with a quick and easy means for determining loop requirements on existing gas-transmission pipelines. Adding pipe in parallel to an existing pipeline, referred to as looping, is necessary to insure that with a given flow rate, the gas will arrive at a certain point on the pipeline with a pressure equal to or greater than the minimum required pressure. The automatic loop program calculates loop by first determining the total number of segments which require looping within the section of pipeline being evaluated. A section of pipe is usually the pipeline between compressor stations and is divided into segments by either receipt or delivery points along the pipeline. The number of segments which require looping is found by adding loop to individual segments until the final pressure (i.e., the pressure at the point of interest downstream on the pipeline) is equal to or greater than the specified design pressure.

Bierman, G.D.

1983-10-31T23:59:59.000Z

304

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

305

Chemical Looping Combustion Reactions and Systems  

SciTech Connect (OSTI)

Chemical Looping Combustion (CLC) is one promising fuel-combustion technology, which can facilitate economic CO2 capture in coal-fired power plants. It employs the oxidation/reduction characteristics of a metal, or oxygen carrier, and its oxide, the oxidizing gas (typically air) and the fuel source may be kept separate. This work focused on two classes of oxygen carrier, one that merely undergoes a change in oxidation state, such as Fe3O4/Fe2O3 and one that is converted from its higher to its lower oxidation state by the release of oxygen on heating, i.e., CuO/Cu2O. This topical report discusses the results of four complementary efforts: (1) the development of process and economic models to optimize important design considerations, such as oxygen carrier circulation rate, temperature, residence time; (2) the development of high-performance simulation capabilities for fluidized beds and the collection, parameter identification, and preliminary verification/uncertainty quantification (3) the exploration of operating characteristics in the laboratory-scale bubbling bed reactor, with a focus on the oxygen carrier performance, including reactivity, oxygen carrying capacity, attrition resistance, resistance to deactivation, cost and availability (4) the identification of mechanisms and rates for the copper, cuprous oxide, and cupric oxide system using thermogravimetric analysis.

Sarofim, Adel; Lighty, JoAnn; Smith, Philip; Whitty, Kevin; Eyring, Edward; Sahir, Asad; Alvarez, Milo; Hradisky, Michael; Clayton, Chris; Konya, Gabor; Baracki, Richard; Kelly, Kerry

2011-07-01T23:59:59.000Z

306

Folding of a DNA Hairpin Loop Structure in Explicit SolventUsingRepli...  

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

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

307

Model-guided empirical tuning of loop fusion  

Science Journals Connector (OSTI)

Loop fusion is recognised as an effective transformation for improving memory hierarchy performance. However, unconstrained loop fusion can lead to poor performance because of increased register pressure and cache conflict misses. In this paper, we present a cache-conscious analytical model for profitable loop fusion. We use this model to tune fusion parameters for different architectures through empirical search. Experiments on four different platforms for a set of applications show significant speedup over fully optimised code generated by state-of-the-art commercial compilers.

Apan Qasem; Ken Kennedy

2008-01-01T23:59:59.000Z

308

The circular loop antenna over a lossy dielectric slab  

E-Print Network [OSTI]

interfaces. The method of moments is employed to solve the resulting 1ntegral equations for the current distribut1on on the loop. With the current distribution determined, the input impedance and input admit- tance are calculated. The electromagnetic f1... of the current density can be neglected. For the loop antenna, the surface current density can be written as (2. 3a) where $' = cos(4 - $') f + sin(4 - 4 ')p (2. 3b) In developing an integral equation to represent the loop, the observation point is located...

Overly, Michael Robert

2012-06-07T23:59:59.000Z

309

Very Large Array observations of coronal loops and related observations of solar-type stars. Annual scientific report, 1 January-31 December 1984  

SciTech Connect (OSTI)

Observations of solar-active regions with the Very Large Array (V.L.A.) led to a new understanding of the origin and prediction of the solar bursts that disrupt communication systems and interfere with high-flying aircraft. The V.L.A. was used to delineate the temperature and magnetic structure at different heights in coronal loops, and the magnetic field strength was also determined. Much of the visible solar disk was resolved at 20-cm wavelength with 2.6-in. angular resolution. Snapshot maps at intervals of 3 seconds were used to specify changes in the temperature and the magnetic field before and during solar bursts. These snapshot maps were used to investigate the flow of plasma within coronal loops during solar bursts. Postflare loop systems were similarly investigated. These V.L.A. observations provided new information on coronal heating and emerging magnetic loops that may trigger the emission of solar bursts.

Lang, K.R.

1984-01-29T23:59:59.000Z

310

Multipurpose active/passive motion compensation system  

SciTech Connect (OSTI)

A microprocessor-controlled active/passive motion compensation system has been developed for deploying a variety of geotechnical in-situ testing devices with mobile drilling rigs from low-cost service vessels. The light-weight rotary heave compensator incorporates a hydraulic motor as the compensator actuator and a servo-controlled closed loop pump to reduce the air storage and power requirements. Unique features of the system are the use of inertial sensors to measure three components of boat motion, the ability to run the system in active/passive or passive modes, and the ability to automatically lower the drillstring at a constant velocity while maintaining motion compensation. Quantitative measurements made during sea trials offshore California yielded motion compensation accuracy approaching 98 percent which is much better than the compensation achieved with passive systems. Results are presented from offshore in-situ testing with a cone penetrometer, a vane shear device, and a suspension PS logger. The system can also be used for other offshore applications.

Sullivan, R.A.; Clements, R.E.; Davenport, M.R.

1984-05-01T23:59:59.000Z

311

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

312

Closing Gaps in Modeling Multifamily Retrofits  

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

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)

313

Sodium Plugging Test Loop - Nuclear Engineering Division (Argonne)  

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

314

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

315

758-60 751-54 Tanana Loop  

E-Print Network [OSTI]

Service 308 Tanana Loop Hutchison Institute of Technology West Valley High School Constitution Hall Key Station, Yankovich Road Harper Building, 4280 Geist Road (Interior-Aleutians Campus) West Valley Plaza

Wagner, Diane

316

HIGH SPATIAL RESOLUTION OBSERVATIONS OF LOOPS IN THE SOLAR CORONA  

SciTech Connect (OSTI)

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

Brooks, David H.; Ugarte-Urra, Ignacio [College of Science, George Mason University, 4400 University Drive, Fairfax, VA 22030 (United States); Warren, Harry P. [Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States); Winebarger, Amy R. [NASA Marshall Space Flight Center, ZP 13, Huntsville, AL 35812 (United States)

2013-08-01T23:59:59.000Z

317

Progress of energy system with chemical-looping combustion  

Science Journals Connector (OSTI)

Chemical-looping combustion with zero energy penalty of CO2...separation is a significant breakthrough in resolving energy and environment problems for power generation systems. This paper summarizes the research...

HongGuang Jin; Hui Hong; Tao Han

2009-03-01T23:59:59.000Z

318

Local gauge-invariant generators for Wilson loops  

Science Journals Connector (OSTI)

A complete and irreducible set of gauge-invariant local generators for Wilson loops in a pure Yang-Mills theory is constructed. A few comments are made about their relevance in quantum theory in the 1N approximation scheme.

M. Azam

1989-11-15T23:59:59.000Z

319

How are Feynman graphs resumed by the Loop Vertex Expansion?  

E-Print Network [OSTI]

The purpose of this short letter is to clarify which set of pieces of Feynman graphs are resummed in a Loop Vertex Expansion, and to formulate a conjecture on the $\\phi^4$ theory in non-integer dimension.

Vincent Rivasseau; Zhituo Wang

2010-06-23T23:59:59.000Z

320

Building Energy Software Tools Directory: Ground Loop Design  

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


321

Loop quantum cosmology in 2+1 dimension  

E-Print Network [OSTI]

As a first step to generalize the structure of loop quantum cosmology to the theories with the spacetime dimension other than four, the isotropic model of loop quantum cosmology in 2+1 dimension is studied in this paper. We find that the classical big bang singularity is again replaced by a quantum bounce in the model. The similarities and differences between the 2+1 dimensional model and the 3+1 dimensional one are also discussed.

Xiangdong Zhang

2014-11-19T23:59:59.000Z

322

Periodic gravitational waves from small cosmic string loops  

Science Journals Connector (OSTI)

We consider a population of small, high-velocity cosmic string loops. We assume the typical length of these loops is determined by the gravitational radiation scale and use the results of Polchinski and Rocha which pointed out their highly relativistic nature. A study of the gravitational wave emission from such a population is carried out. The large Lorentz boost involved causes the lowest harmonics of the loops to fall within the frequency band of the Laser Interferometer Gravitational Wave Observatory detector. Because of this feature the gravitational waves emitted by such loops can be detected in a periodic search rather than in burst or stochastic analysis. It is shown that, for interesting values of the string tension (10-10?G??10-8), the detector can observe loops at reasonably high redshifts and that detection is, in principle, possible. We compute the number of expected observations produced by such a process. For a 10 h search we find that this number is of order O(10-4). This is a consequence of the low effective number density of the loops traveling along the line of sight. However, small probabilities of reconnection and longer observation times can improve the result.

Florian Dubath and Jorge V. Rocha

2007-07-02T23:59:59.000Z

323

Double-winding Wilson loops and monopole confinement mechanisms  

E-Print Network [OSTI]

We consider "double-winding" Wilson loops in SU(2) gauge theory. These are contours which wind once around a loop $C_1$ and once around a loop $C_2$, where the two co-planar loops share one point in common, and where $C_1$ lies entirely in (or is displaced slightly from) the minimal area of $C_2$. We discuss the expectation value of such double-winding loops in abelian confinement pictures, where the spatial distribution of confining abelian fields is controlled by either a monopole Coulomb gas, a caloron ensemble, or a dual abelian Higgs model, and argue that in such models an exponential falloff in the sum of areas $A_1+A_2$ is expected. In contrast, in a center vortex model of confinement, the behavior is an exponential falloff in the difference of areas $A_2-A_1$. We compute such double-winding loops by lattice Monte Carlo simulation, and find that the area law falloff follows a difference-in-areas law. The conclusion is that even if confining gluonic field fluctuations are, in some gauge, mainly abelian ...

Greensite, Jeff

2014-01-01T23:59:59.000Z

324

Wilson loops to 20th order numerical stochastic perturbation theory  

Science Journals Connector (OSTI)

We calculate perturbative contributions of Wilson loops of various sizes up to order 20 in SU(3) pure lattice gauge theory at different lattice sizes for the Wilson gauge action using the technique of numerical stochastic perturbation theory. This allows us to investigate the perturbative series for various Wilson loops at high orders of the perturbation theory. We observe differences in the behavior of the series as a function of the loop order n. Up to n=20 we do not find evidence for the factorial growth of the expansion coefficients often assumed to characterize an asymptotic series. Based on the actually observed behavior we sum the series in a model parametrized by hypergeometric functions. For Wilson loops of moderate sizes the summed series in boosted perturbation theory reach stable plateaus for moderate perturbative order already. The coefficients in the boosted series become much more stable in the result of smoothing the coefficients of the original series effected by the hypergeometric model. We introduce generalized ratios of Wilson loops of different sizes. Together with the corresponding Wilson loops from standard Monte Carlo measurements they enable us to assess their nonperturbative parts.

R. Horsley; G. Hotzel; E.-M. Ilgenfritz; R. Millo; H. Perlt; P. E. L. Rakow; Y. Nakamura; G. Schierholz; A. Schiller

2012-09-06T23:59:59.000Z

325

Process modeling aspects of chemical-looping with oxygen uncoupling and chemical-looping combustion for solid fuels.  

E-Print Network [OSTI]

??Chemical-looping combustion (CLC) is one of the candidate technologies that is currently being explored to reduce the energy penalty associated with capturing CO2 from coal-fired… (more)

Sahir, Asad Hasan

2013-01-01T23:59:59.000Z

326

Three-loop on-shell charge renormalization without integration: \\(\\Lambda _{QED}^{\\overline {MS} } \\) to four loops  

Science Journals Connector (OSTI)

Using algebraic methods, we find the three-loop relation between the bare and physical couplings of one-flavourD-dimensional QED, in terms of ? functions and a singleF 32 series, whose expansion n...

D. J. Broadhurst

1992-01-01T23:59:59.000Z

327

Microrheology close to an equilibrium phase transition  

SciTech Connect (OSTI)

We investigate the microstructural and microrheological response to a tracer particle of a two-dimensional colloidal suspension under thermodynamic conditions close to a liquid-gas phase boundary. On the liquid side of the binodal, increasing the velocity of the (repulsive) tracer leads to the development of a pronounced cavitation bubble, within which the concentration of colloidal particles is strongly depleted. The tendency of the liquid to cavitate is characterized by a dimensionless “colloidal cavitation” number. On the gas side of the binodal, a pulled (attractive) tracer leaves behind it an extended trail of colloidal liquid, arising from downstream advection of a wetting layer on its surface. For both situations the velocity dependent friction is calculated.

Reinhardt, J.; Scacchi, A.; Brader, J. M., E-mail: joseph.brader@unifr.ch [Department of Physics, University of Fribourg, CH-1700 Fribourg (Switzerland)

2014-04-14T23:59:59.000Z

328

Closed string tachyon condensation and worldsheet inflation  

Science Journals Connector (OSTI)

Closed string tachyon condensation in spacetime generates potentials on the worldsheet that model two-dimensional inflationary cosmology. These models illustrate and elucidate a variety of aspects of inflation, in particular the generation of quantum fluctuations and their back reaction on geometry. We exhibit a class of Liouville gravity models coupled to matter that can exhibit, for example, (a) pure de Sitter gravity, (b) slow-roll inflation, (c) topological inflation, and (d) graceful exit into a Friedmann-Robertson-Walker (FRW) phase. The models also provide a quantitative testing ground for ideas about the origin of inflation, such as the various “no-boundary or tunnelling” proposals, and the “eternal or chaotic” inflationary scenario. We suggest an alternative mechanism for quantum creation of cosmological spacetimes which, in the context of the model, provides a natural explanation for why the typical FRW cosmology at large scales underwent a period of inflation at small scale.

Bruno Carneiro da Cunha and Emil J. Martinec

2003-09-08T23:59:59.000Z

329

Loop Recreation for Thread-Level Speculation Lin Gao, Lian Li and Jingling Xue  

E-Print Network [OSTI]

Loop Recreation for Thread-Level Speculation Lin Gao, Lian Li and Jingling Xue University of New. This paper presents a novel compiler tech- nique, called loop recreation, to transform a loop into a prologue the concept by giving an algorithm for find- ing an optimal loop recreation with respect to a simple

Xue, Jingling

330

Evaluation of Novel Ceria-Supported Metal Oxides As Oxygen Carriers for Chemical-Looping Combustion  

E-Print Network [OSTI]

Evaluation of Novel Ceria-Supported Metal Oxides As Oxygen Carriers for Chemical-Looping Combustion and examined as oxygen carrier materials for chemical-looping combustion (CLC). Unlike conventional support agglomeration. 1. INTRODUCTION 1.1. Chemical-Looping Combustion. Chemical-looping combustion (CLC

Azad, Abdul-Majeed

331

Theory and Algorithms for Software Pipelining with Minimal Cost on Nested Loops  

E-Print Network [OSTI]

Theory and Algorithms for Software Pipelining with Minimal Cost on Nested Loops Qingfeng Zhuge. However, little research has been done for the software pipelining problem on nested loops. The existing software pipelining techniques for single loops can only explore the innermost loop parallelism of a nested

Sha, Edwin

332

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

333

Use of Multiple Reheat Helium Brayton Cycles to Eliminate the Intermediate Heat Transfer Loop for Advanced Loop Type SFRs  

SciTech Connect (OSTI)

The sodium intermediate heat transfer loop is used in existing sodium cooled fast reactor (SFR) plant design as a necessary safety measure to separate the radioactive primary loop sodium from the water of the steam Rankine power cycle. However, the intermediate heat transfer loop significantly increases the SFR plant cost and decreases the plant reliability due to the relatively high possibility of sodium leakage. A previous study shows that helium Brayton cycles with multiple reheat and intercooling for SFRs with reactor outlet temperature in the range of 510°C to 650°C can achieve thermal efficiencies comparable to or higher than steam cycles or recently proposed supercritical CO2 cycles. Use of inert helium as the power conversion working fluid provides major advantages over steam or CO2 by removing the requirement for safety systems to prevent and mitigate the sodium-water or sodium-CO2 reactions. A helium Brayton cycle power conversion system therefore makes the elimination of the intermediate heat transfer loop possible. This paper presents a pre-conceptual design of multiple reheat helium Brayton cycle for an advanced loop type SFR. This design widely refers the new horizontal shaft distributed PBMR helium power conversion design features. For a loop type SFR with reactor outlet temperature 550°C, the design achieves 42.4% thermal efficiency with favorable power density comparing with high temperature gas cooled reactors.

Haihua Zhao; Hongbin Zhang; Samuel E. Bays

2009-05-01T23:59:59.000Z

334

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)

335

An investigation of steam production in chemical-looping combustion (CLC) and chemical-looping with oxygen uncoupling (CLOU) for solid fuels  

Science Journals Connector (OSTI)

Abstract Chemical-looping combustion (CLC) and chemical-looping with oxygen uncoupling (CLOU) are being actively explored as solid fuel combustion technologies that have the potential to facilitate CO2 capture. While CLC and CLOU have similarities operationally, there are some key differences. In particular, the CLC process requires a coal gasification step where coal is first broken down into a syngas with the use of steam or CO2. The resulting syngas is then oxidized with the metal oxide to release energy. In the CLOU process the metal oxide releases oxygen that combusts the solid fuel, resulting in a lower residence time, as the coal gasification reactions are avoided. The CLC and CLOU systems were modeled with ASPEN Plus at a 10 \\{MWth\\} scale, and the process streams were analyzed by ASPEN Energy Analyzer to determine the amount of industrial process steam that could be generated from CLC or CLOU. Both the air and fuel reactor were analyzed as two circulating fluidized beds, with metal oxide circulating between the two reactors. The air reactor, where metal oxide is oxidized, was fluidized with air. The fuel reactor, where the metal oxide is reduced, was fluidized with steam for CLC and recirculated CO2 for CLOU. It was identified that the CLOU process had the potential to produce more steam, approximately 7920 kg/hr, as compared to CLC (6910 kg/hr).

J.K. Dansie; A.H. Sahir; M.A. Hamilton; J.S. Lighty

2014-01-01T23:59:59.000Z

336

Detection Rates for Close Binaries Via Microlensing  

E-Print Network [OSTI]

Microlensing is one of the most promising methods of reconstructing the stellar mass function down to masses even below the hydrogen-burning limit. The fundamental limit to this technique is the presence of unresolved binaries, which can in principle significantly alter the inferred mass function. Here we quantify the fraction of binaries that can be detected using microlensing, considering specifically the mass ratio and separation of the binary. We find that almost all binary systems with separations greater than $b \\sim 0.4$ of their combined Einstein ring radius are detectable assuming a detection threshold of $3\\%$. For two M dwarfs, this corresponds to a limiting separation of $\\gsim 1 \\au$. Since very few observed M dwarfs have companions at separations $\\lsim 1 \\au$, we conclude that close binaries will probably not corrupt the measurements of the mass function. We find that the detectability depends only weakly on the mass ratio. For those events for which individual masses can be determined, we find that binaries can be detected down to $b \\sim 0.2$.

B. Scott Gaudi; Andrew Gould

1996-06-17T23:59:59.000Z

337

DOE Award # DE-SC0008085 Close-Out Report for UIUC Portion of Grant  

SciTech Connect (OSTI)

This is the final technical report for the University of Illinois (UIUC) portion of grant # SC0008085 (CARBON DYNAMICS OF FOREST RECOVERY UNDER A CHANGING CLIMATE: FORCINGS, FEEDBACKS, AND IMPLICATIONS FOR EARTH SYSTEM MODELING), which closed June 14, 2014. The grant remains active at the Smithsonian.

Teixeira, Kristina Anderson; DeLucia, Evan H

2014-11-20T23:59:59.000Z

338

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

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

339

Profiles of heating in turbulent coronal magnetic loops  

E-Print Network [OSTI]

Context: The location of coronal heating in magnetic loops has been the subject of a long-lasting controversy: does it occur mostly at the loop footpoints, at the top, is it random, or is the average profile uniform? Aims: We try to address this question in model loops with MHD turbulence and a profile of density and/or magnetic field along the loop. Methods: We use the ShellAtm MHD turbulent heating model described in Buchlin & Velli (2006), with a static mass density stratification obtained by the HydRad model (Bradshaw & Mason 2003). This assumes the absence of any flow or heat conduction subsequent to the dynamic heating. Results: The average profile of heating is quasi-uniform, unless there is an expansion of the flux tube (non-uniform axial magnetic field) or the variation of the kinetic and magnetic diffusion coefficients with temperature is taken into account: in the first case the heating is enhanced at footpoints, whereas in the second case it is enhanced where the dominant diffusion coefficient is enhanced. Conclusions: These simulations shed light on the consequences on heating profiles of the complex interactions between physical effects involved in a non-uniform turbulent coronal loop.

E. Buchlin; P. J. Cargill; S. J. Bradshaw; M. Velli

2007-02-28T23:59:59.000Z

340

Conversion of coal to gasoline in one single synthesis loop  

SciTech Connect (OSTI)

The process scheme for the conversion of syngas to gasoline via methanol (MeOH) developed by Mobil consists in essence of two independent synthesis loops, a MeOH and a gasoline loop. The first is a conventional MeOH-plant which produces raw MeOH. The raw MeOH is evaporated into a second synthesis loop, the methanol to gasoline (MTG) synthesis. This scheme is already in commercial operation in New Zealand. The syngas is produced by steam reforming of natural gas. A further development of this technology based on integration of the two syntheses is demonstrated in the Topsoe-Integrated-Gasoline-Synthesis, TIGAS. The main difference between the two schemes is that in the TIGAS process, the two loops, the MeOH synthesis and the Mobil MTG-process, are integrated into one single synthesis loop without isolation of MeOH as an intermediate. This results in a simple flow scheme and, hence, in substantial savings in investments and energy consumption.

Topp-Jorgensen, J.; Rostrup-Nielsen, J.R.

1986-01-01T23:59:59.000Z

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.


341

Spedding entry closed due to falling debris | The Ames Laboratory  

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

Spedding entry closed due to falling debris Facilities and Engineering Services, with concurrence from ESH&A, has closed the front (north) entrance of Spedding Hall to all but...

342

ACTIVE FILTER HARDWARE DESIGN & PERFORMANCE FOR THE DIII-D PLASMA CONTROL SYSTEM  

SciTech Connect (OSTI)

OAK-B135 The digital plasma control system (PCS), currently in operation on the DIII-D tokamak, requires inputs from a large number of sensors. Due to the nature of the digitizers and the relative noisy environment from which these signals are derived, each of the 32 signals must be conditioned via an active filter. Two different types of filters, Chebyshev and Bessel with fixed frequencies: 100 Hz Bessel was used for filtering the motional Stark effect diagnostic data. 800 Hz Bessel was designed to filter plasma control data and 1200 Hz Chebyshev is used with closed loop control of choppers. The performance of the plasma control system is greatly influenced by how well the actual filter responses match the software model used in the control system algorithms. This paper addresses the various issues facing the designer in matching the electrical design with the theoretical.

SELLERS,D; FERRON,J.R; WALKER,M.L; BROESCH,J.D

2003-10-01T23:59:59.000Z

343

Loop-induced Neutrino Masses: A Case Study  

E-Print Network [OSTI]

We study the cocktail model in which the Majorana neutrino masses are generated by the so-called "cocktail" three-loop diagrams with the dark matter particle running in the loops. In particular, we give the correct analytic expressions of the neutrino masses in the model by the detailed calculation of the cocktail diagrams. Based on the reliable numerical calculation of the loop integrals, we explore the parameter space which can give the correct orders of neutrino masses while satisfying other experimental constraints, such as those from the neutrinoless double beta decay, low-energy lepton flavor violation processes, electroweak precision tests, and collider searches. As a result, the large couplings and the large mass difference between the two singly-charged (neutral) scalars are required.

Geng, Chao-Qiang; Tsai, Lu-Hsing

2014-01-01T23:59:59.000Z

344

Automated One-Loop Calculations with GoSam  

E-Print Network [OSTI]

We present the program package GoSam which is designed for the automated calculation of one-loop amplitudes for multi-particle processes in renormalisable quantum field theories. The amplitudes, which are generated in terms of Feynman diagrams, can be reduced using either D-dimensional integrand-level decomposition or tensor reduction. GoSam can be used to calculate one-loop QCD and/or electroweak corrections to Standard Model processes and offers the flexibility to link model files for theories Beyond the Standard Model. A standard interface to programs calculating real radiation is also implemented. We demonstrate the flexibility of the program by presenting examples of processes with up to six external legs attached to the loop.

Gavin Cullen; Nicolas Greiner; Gudrun Heinrich; Gionata Luisoni; Pierpaolo Mastrolia; Giovanni Ossola; Thomas Reiter; Francesco Tramontano

2011-11-08T23:59:59.000Z

345

Infrared Properties of Close Pairs of Galaxies  

E-Print Network [OSTI]

We discuss spectroscopy and infrared photometry for a complete sample of ~ 800 galaxies in close pairs objectively selected from the CfA2 redshift survey. We use 2MASS to compare near infrared color-color diagrams for our sample with the Nearby Field Galaxy Sample and with a set of IRAS flux-limited pairs from Surace et al. We construct a basic statistical model to explore the physical sources of the substantial differences among these samples. The model explains the spread of near infrared colors and is consistent with a picture where central star formation is triggered by the galaxy-galaxy interaction before a merger occurs. For 160 galaxies we report new, deep JHK photometry within our spectroscopic aperture and we use the combined spectroscopic and photometric data to explore the physical conditions in the central bursts. We find a set of objects with H-K >= 0.45 and with a large F(FIR)/F(H). We interpret the very red H-K colors as evidence for 600-1000 K dust within compact star-forming regions, perhaps similar to super-star clusters identified in individual well-studied interacting galaxies. The galaxies in our sample are candidate ``hidden'' bursts or, possibly, ``hidden'' AGN. Over the entire pair sample, both spectroscopic and photometric data show that the specific star formation rate decreases with the projected separation of the pair. The data suggest that the near infrared color-color diagram is also a function of the projected separation; all of the objects with central near infrared colors indicative of bursts of star formation lie at small projected separation.

Margaret J. Geller; Scott J. Kenyon; Elizabeth J. Barton; Thomas H. Jarrett; Lisa J. Kewley

2006-08-02T23:59:59.000Z

346

THERMAL STRUCTURE OF CORONAL LOOPS AS SEEN WITH NORIKURA CORONAGRAPH  

SciTech Connect (OSTI)

The thermal structure of a coronal loop, both along and across the loop, is vital in determining the exact plasma heating mechanism. High-resolution spectroscopic observations of the off-limb corona were made using the 25 cm Norikura coronagraph, located at Norikura, Japan. Observations on a number of days were made simultaneously in four forbidden iron emission lines, namely, the [Fe XI] 7892 A line, the [Fe XIII] 10747 A and 10798 A lines, and the [Fe XIV] 5303 A line and on some days made only in the [Fe XI] 7892 A and [Fe X] 6374 A lines. Using temperature sensitive emission line ratios [Fe XIV] 5303 A/[Fe XIII] 10747 A and [Fe XI] 7892 A/[Fe X] 6374 A, we compute the electron temperatures along 18 different loop structures observed on different days. We find a significant negative temperature gradient in all of the structures observed in Fe XIV and Fe XIII and a positive temperature gradient in the structures observed in Fe XI and Fe X. Combining these results with the previous investigations by Singh and his collaborators, we infer that the loop tops, in general, appear hotter when observed in colder lines and colder when observed in relatively hotter lines as compared to their coronal foot points. We suggest that this contrasting trend observed in the temperature variation along the loop structures can be explained by a gradual interaction of different temperature plasma. The exact mechanism responsible for this interaction must be investigated further and has the potential to constrain loop heating models.

Prasad, S. Krishna; Singh, Jagdev [Indian Institute of Astrophysics, II Block, Koramangala, Bangalore 560 034 (India); Ichimoto, K., E-mail: krishna@iiap.res.in [Kwasan and Hida Observatories, Kyoto University, Yamashina-ku, Kyoto 607-8417 (Japan)

2013-03-10T23:59:59.000Z

347

Loop calculus in statistical physics and information science  

Science Journals Connector (OSTI)

Considering a discrete and finite statistical model of a general position we introduce an exact expression for the partition function in terms of a finite series. The leading term in the series is the Bethe-Peierls (belief propagation) (BP) contribution; the rest are expressed as loop contributions on the factor graph and calculated directly using the BP solution. The series unveils a small parameter that often makes the BP approximation so successful. Applications of the loop calculus in statistical physics and information science are discussed.

Michael Chertkov and Vladimir Y. Chernyak

2006-06-01T23:59:59.000Z

348

Automated one-loop calculations with GoSam  

E-Print Network [OSTI]

In this talk, the program package GOSAM is presented, which can be used for the automated calculation of one-loop amplitudes for multi-particle processes. The integrands are generated in terms of Feynman diagrams and can be reduced by d-dimensional integrand-level decomposition, or tensor reduction, or a combination of both. Through various examples we show that GOSAM can produce one-loop amplitudes for both QCD and electroweak theory; model files for theories Beyond the Standard Model can be linked as well.

G. Cullen; N. Greiner; G. Heinrich; G. Luisoni; P. Mastrolia; G. Ossola; T. Reiter; F. Tramontano

2012-01-13T23:59:59.000Z

349

Investigation of Gasification Chemical Looping Combustion Combined Cycle Performance  

Science Journals Connector (OSTI)

Combining CLC with a gas turbine combined cycle offers a novel power generation technique with high efficiency and CO2 separation. ... Here, we have developed looping materials based on the integration of NiO, as solid reactants, with a composite metal oxide of NiAl2O4, as a binder, leading to a significant role in improving reaction rate, conversion, and regenerability in cyclic reaction in this combustor, compared with the other materials. ... Chemical looping combustion for combined cycles with CO2 capture. ...

Wenguo Xiang; Sha Wang; Tengteng Di

2008-02-19T23:59:59.000Z

350

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

351

Register Closing Effects on Forced Air Heating System Performance  

SciTech Connect (OSTI)

Closing registers in forced air heating systems and leaving some rooms in a house unconditioned has been suggested as a method of quickly saving energy for California consumers. This study combined laboratory measurements of the changes in duct leakage as registers are closed together with modeling techniques to estimate the changes in energy use attributed to closing registers. The results of this study showed that register closing led to increased energy use for a typical California house over a wide combination of climate, duct leakage and number of closed registers. The reduction in building thermal loads due to conditioning only a part of the house was offset by increased duct system losses; mostly due to increased duct leakage. Therefore, the register closing technique is not recommended as a viable energy saving strategy for California houses with ducts located outside conditioned space. The energy penalty associated with the register closing technique was found to be minimized if registers furthest from the air handler are closed first because this tends to only affect the pressures and air leakage for the closed off branch. Closing registers nearer the air handler tends to increase the pressures and air leakage for the whole system. Closing too many registers (more than 60%) is not recommended because the added flow resistance severely restricts the air flow though the system leading to safety concerns. For example, furnaces may operate on the high-limit switch and cooling systems may suffer from frozen coils.

Walker, Iain S.

2003-11-01T23:59:59.000Z

352

Nonlinear Tides in Close Binary Systems  

Science Journals Connector (OSTI)

We study the excitation and damping of tides in close binary systems, accounting for the leading-order nonlinear corrections to linear tidal theory. These nonlinear corrections include two distinct physical effects: three-mode nonlinear interactions, i.e., the redistribution of energy among stellar modes of oscillation, and nonlinear excitation of stellar normal modes by the time-varying gravitational potential of the companion. This paper, the first in a series, presents the formalism for studying nonlinear tides and studies the nonlinear stability of the linear tidal flow. Although the formalism we present is applicable to binaries containing stars, planets, and/or compact objects, we focus on non-rotating solar-type stars with stellar or planetary companions. Our primary results include the following: (1) The linear tidal solution almost universally used in studies of binary evolution is unstable over much of the parameter space in which it is employed. More specifically, resonantly excited internal gravity waves in solar-type stars are nonlinearly unstable to parametric resonance for companion masses M' 10-100 M ? at orbital periods P ? 1-10 days. The nearly static "equilibrium" tidal distortion is, however, stable to parametric resonance except for solar binaries with P 2-5 days. (2) For companion masses larger than a few Jupiter masses, the dynamical tide causes short length scale waves to grow so rapidly that they must be treated as traveling waves, rather than standing waves. (3) We show that the global three-wave treatment of parametric instability typically used in the astrophysics literature does not yield the fastest-growing daughter modes or instability threshold in many cases. We find a form of parametric instability in which a single parent wave excites a very large number of daughter waves (N ? 103[P/10 days] for a solar-type star) and drives them as a single coherent unit with growth rates that are a factor of ?N faster than the standard three-wave parametric instability. These are local instabilities viewed through the lens of global analysis; the coherent global growth rate follows local rates in the regions where the shear is strongest. In solar-type stars, the dynamical tide is unstable to this collective version of the parametric instability for even sub-Jupiter companion masses with P a month. (4) Independent of the parametric instability, the dynamical and equilibrium tides excite a wide range of stellar p-modes and g-modes by nonlinear inhomogeneous forcing; this coupling appears particularly efficient at draining energy out of the dynamical tide and may be more important than either wave breaking or parametric resonance at determining the nonlinear dissipation of the dynamical tide.

Nevin N. Weinberg; Phil Arras; Eliot Quataert; Josh Burkart

2012-01-01T23:59:59.000Z

353

LOCA with consequential or delayed LOOP accidents: Unique issues, plant vulnerability, and CDF contributions  

SciTech Connect (OSTI)

A loss-of-coolant accident (LOCA) can cause a loss-of-offsite power (LOOP) wherein the LOOP is usually delayed by few seconds or longer. Such an accident is called LOCA with consequential LOOP, or LOCA with delayed LOOP (here, abbreviated as LOCA/LOOP). This paper analyzes the unique conditions that are associated with a LOCA/LOOP, presents a model, and quantifies its contribution to core damage frequency (CDF). The results show that the CDF contribution can be a dominant contributor to risk for certain plant designs, although boiling water reactors (BWRs) are less vulnerable than pressurized water reactors (PWRs).

Martinez-Guridi, G.; Samanta, P.; Chu, L.; Yang, J.

1998-08-01T23:59:59.000Z

354

NONLINEAR TIDES IN CLOSE BINARY SYSTEMS  

SciTech Connect (OSTI)

We study the excitation and damping of tides in close binary systems, accounting for the leading-order nonlinear corrections to linear tidal theory. These nonlinear corrections include two distinct physical effects: three-mode nonlinear interactions, i.e., the redistribution of energy among stellar modes of oscillation, and nonlinear excitation of stellar normal modes by the time-varying gravitational potential of the companion. This paper, the first in a series, presents the formalism for studying nonlinear tides and studies the nonlinear stability of the linear tidal flow. Although the formalism we present is applicable to binaries containing stars, planets, and/or compact objects, we focus on non-rotating solar-type stars with stellar or planetary companions. Our primary results include the following: (1) The linear tidal solution almost universally used in studies of binary evolution is unstable over much of the parameter space in which it is employed. More specifically, resonantly excited internal gravity waves in solar-type stars are nonlinearly unstable to parametric resonance for companion masses M' {approx}> 10-100 M{sub Circled-Plus} at orbital periods P Almost-Equal-To 1-10 days. The nearly static 'equilibrium' tidal distortion is, however, stable to parametric resonance except for solar binaries with P {approx}< 2-5 days. (2) For companion masses larger than a few Jupiter masses, the dynamical tide causes short length scale waves to grow so rapidly that they must be treated as traveling waves, rather than standing waves. (3) We show that the global three-wave treatment of parametric instability typically used in the astrophysics literature does not yield the fastest-growing daughter modes or instability threshold in many cases. We find a form of parametric instability in which a single parent wave excites a very large number of daughter waves (N Almost-Equal-To 10{sup 3}[P/10 days] for a solar-type star) and drives them as a single coherent unit with growth rates that are a factor of Almost-Equal-To N faster than the standard three-wave parametric instability. These are local instabilities viewed through the lens of global analysis; the coherent global growth rate follows local rates in the regions where the shear is strongest. In solar-type stars, the dynamical tide is unstable to this collective version of the parametric instability for even sub-Jupiter companion masses with P {approx}< a month. (4) Independent of the parametric instability, the dynamical and equilibrium tides excite a wide range of stellar p-modes and g-modes by nonlinear inhomogeneous forcing; this coupling appears particularly efficient at draining energy out of the dynamical tide and may be more important than either wave breaking or parametric resonance at determining the nonlinear dissipation of the dynamical tide.

Weinberg, Nevin N. [Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139 (United States); Arras, Phil [Department of Astronomy, University of Virginia, P.O. Box 400325, Charlottesville, VA 22904-4325 (United States); Quataert, Eliot; Burkart, Josh, E-mail: nevin@mit.edu [Astronomy Department and Theoretical Astrophysics Center, 601 Campbell Hall, University of California, Berkeley, CA 94720 (United States)

2012-06-01T23:59:59.000Z

355

Intersections of loops and the Andersen–Mattes–Reshetikhin algebra  

Science Journals Connector (OSTI)

......that and have the same base point and such that lifts to a straight line r2...homotopic as arcs with fixed end points. Now one considers four possible cases of signs...the 8-gon enumerate the four intersection points between the loops b1 and......

Patricia Cahn; Vladimir Chernov

2013-06-01T23:59:59.000Z

356

Two-loop pinch technique in the electroweak sector  

Science Journals Connector (OSTI)

The generalization of the two-loop pinch technique to the electroweak sector of the standard model is presented. We restrict ourselves to the case of conserved external currents, and provide a detailed analysis of both the charged and neutral sectors. The crucial ingredient for this construction is the identification of the parts discarded during the pinching procedure with well-defined contributions to the Slavnov-Taylor identity satisfied by the off-shell one-loop gauge-boson vertices; the latter are nested inside the conventional two-loop self-energies. It is shown by resorting to a set of powerful identities that the two-loop effective pinch technique self-energies coincide with the corresponding ones computed in the background Feynman gauge. The aforementioned identities are derived in the context of the Batalin-Vilkovisky formalism, a fact which enables the individual treatment of the self-energies of the photon and the Z boson. Some possible phenomenological applications are briefly discussed.

Daniele Binosi and Joannis Papavassiliou

2002-10-29T23:59:59.000Z

357

STRING LOOPS IN BACKGROUND FIELDS Scott Alan Yost  

E-Print Network [OSTI]

excellent collaborators. They have made my stay at Princeton very productive and enjoyable. I thank E. LiebSTRING LOOPS IN BACKGROUND FIELDS Scott Alan Yost A dissertation presented to the faculty formalism. ii #12;Acknowledgements I would like to thank my advisor, Chiara Nappi, for her support, advice

Yost, Scott

358

A Knowledge Management Support Environment based on Dual Loop Model  

E-Print Network [OSTI]

A Knowledge Management Support Environment based on Dual Loop Model Mitsuru Ikeda, Yusuke Hayashi individuals and organizations be properly understood and support learning for knowledge inheritance, and encourage the creation, the spreading and inheriting of new knowledge. This paper presents an framework

Mizoguchi, Riichiro

359

Molecular Loops in the Galactic Center: Evidence for Magnetic Flotation  

Science Journals Connector (OSTI)

...Fig. 2. Velocity-galactic longitude diagram toward loops 1 and 2 in J = 1 to 0 12 CO 2.6-mm (color...like a circle in the position-velocity diagram instead of the linear features we...Nondimensional magneto-hydrodynamic (MHD) equations are solved numerically with...

Yasuo Fukui; Hiroaki Yamamoto; Motosuji Fujishita; Natsuko Kudo; Kazufumi Torii; Satoshi Nozawa; Kunio Takahashi; Ryoji Matsumoto; Mami Machida; Akiko Kawamura; Yoshinori Yonekura; Norikazu Mizuno; Toshikazu Onishi; Akira Mizuno

2006-10-06T23:59:59.000Z

360

Convenient Fitness Routes for the SU Community North Campus Loop  

E-Print Network [OSTI]

the Archbold-Flanagan entrance, take Sims Drive to Euclid Ave. to the Lancaster Ave. or Westcott St. intersections and back. Distances: 1.18 miles to Lancaster and back; 1.80 miles to Westcott St. and back. to Barry Park, loop Barry Park (using Meadowbrook Dr., Broad St., and Westcott St.) and then head back

Mather, Patrick T.

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.


361

On Achieving Balanced Power Consumption in Software Pipelined Loops #  

E-Print Network [OSTI]

. The benchmarks are executed on the Wattch power simulator. In comparison to the original (powerOn Achieving Balanced Power Consumption in Software Pipelined Loops # Hongbo Yang Dept of ECE Univ@capsl.udel.edu ABSTRACT While a significant body of work in compilers has been de­ voted to reducing energy consumption

Gao, Guang R.

362

An evaluation of inductance loop detectors for speed measurement accuracy  

E-Print Network [OSTI]

. The lag time from the presence of a vehicle at an inductance loop to the actual detection of a vehicle varies. As the lag time varies so does the accuracy of speed measurement. Vehicle size, vehicle speed, detector type, detector sensitivity...

Cronin, Brian Patrick

2012-06-07T23:59:59.000Z

363

A Random Loop Model for Long Polymers Manfred Bohn  

E-Print Network [OSTI]

the disorder of loops (i.e., bead-bead interactions) is equivalent to the average over an adequate ensemble organisms, as they are permanently altered by enzymes and protein complexes. We present a new polymer model a general expression for the thermal ensemble average of the squared physical distance between two arbitrary

Heermann, Dieter W.

364

Automation of Multi-leg One-loop virtual Amplitudes  

E-Print Network [OSTI]

In the last few years, much progress has been made in the computation of one-loop virtual matrix elements for processes involving many external particles. In this contribution the methods that have enabled this recent progress are briefly reviewed with a focus on their computing and automation aspects.

D. Maitre

2010-06-29T23:59:59.000Z

365

Polyakov loop, Hadron Resonance Gas Model and Thermodynamics of QCD  

E-Print Network [OSTI]

We summarize recent results on the hadron resonance gas description of QCD. In particular, we apply this approach to describe the equation of state and the vacuum expectation value of the Polyakov loop in several representations. Ambiguities related to exactly which states should be included are discussed.

E. Megias; E. Ruiz Arriola; L. L. Salcedo

2013-10-11T23:59:59.000Z

366

Who pays to close a nuke  

SciTech Connect (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

367

State Energy Efficient Appliance Rebate Program is Closed | Department of  

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

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

368

Lab 3: Fading Lab This lab introduces for loops and while loops through control of LEDs, piezo buzzers, and  

E-Print Network [OSTI]

the same actions with the two loops. Materials 1) Arduino Uno 2) MakeBlock Shield 3) 1 Ã? LED 4) 1 Ã? 220 on top of the Arduino. This device provides simple phone cord connections (RJ25) between ports SOURCE BEFORE CHECKING WITH TAs). Supplying too much power and wrong connections can damage the Arduino

Wedeward, Kevin

369

Some Alkali Metal Corrosion Effects in a Rankine Cycle Test Loop  

Science Journals Connector (OSTI)

A two-loop lithium-boiling potassium facility was constructed and tested at the Jet Propulsion Laboratory to simulate the major elements and working fluids of a two-loop, nuclear, turbo-plant concept of intere...

Wayne M. Phillips

1970-01-01T23:59:59.000Z

370

Geek-Up[08.27.10] -- Geothermal Stores, Graphene Loops, Nozzle...  

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

08.27.10 -- Geothermal Stores, Graphene Loops, Nozzle Technology and the 1918 El Nio Geek-Up08.27.10 -- Geothermal Stores, Graphene Loops, Nozzle Technology and the 1918 El...

371

Modeling of Chemical Looping Combustion of Methane Using a Ni-Based Oxygen Carrier  

Science Journals Connector (OSTI)

Modeling of Chemical Looping Combustion of Methane Using a Ni-Based Oxygen Carrier ... The FR and loop seal are both bubbling fluidized beds. ... Industrial & Engineering Chemistry Research (2010), 49 (21), 10200-10211 CODEN: IECRED; ISSN:0888-5885. ...

Ahmed Bougamra; Lu Huilin

2014-03-31T23:59:59.000Z

372

SU(2) Lattice Gauge Theory- Local Dynamics on Non-intersecting Electric flux Loops  

E-Print Network [OSTI]

We use Schwinger Bosons as prepotentials for lattice gauge theory to de?ne local linking oper- ators and calculate their action on linking states for 2 + 1 dimensional SU(2) lattice gauge theory. We develop a diagrammatic technique and associate a set of (lattice Feynman) rules to compute the entire loop dynamics diagrammatically. The physical loop space is shown to contain only non- intersecting loop con?gurations after solving the Mandelstam constraint. The smallest plaquette loops are contained in the physical loop space and other con?gurations are generated by the action of a set of fusion operators on this basic loop states enabling one to charaterize any arbitrary loop by the basic plaquette together with the fusion variables. Consequently, the full Kogut-Susskind Hamiltonian and the dynamics of all possible non-intersecting physical loops are formulated in terms of these fusion variables.

Ramesh Anishetty; Indrakshi Raychowdhury

2014-11-12T23:59:59.000Z

373

Ninja: Automated Integrand Reduction via Laurent Expansion for One-Loop Amplitudes  

E-Print Network [OSTI]

We present the public C++ library Ninja, which implements the Integrand Reduction via Laurent Expansion method for the computation of one-loop integrals. The algorithm is suited for applications to complex one-loop processes.

Tiziano Peraro

2014-03-05T23:59:59.000Z

374

Theory and design of a simple tunable Sagnac loop filter for multiwavelength fiber lasers  

Science Journals Connector (OSTI)

We present a novel design for a Sagnac loop filter (SLF) whose periodic output spectrum can be fully controlled by cascading a small-birefringence loop (SBL) with a high-birefringence...

Mirza, Mohammad Aleem; Stewart, George

2008-01-01T23:59:59.000Z

375

Simultaneous recognition of HIV-1 TAR RNA bulge and loop sequences...  

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

recognition of HIV-1 TAR RNA bulge and loop sequences by cyclic peptide mimics of Tat protein. Simultaneous recognition of HIV-1 TAR RNA bulge and loop sequences by cyclic peptide...

376

Development of a Water Loop Simulation at the Texas A&M University Main Campus  

E-Print Network [OSTI]

A computer simulation model is an economic and convenient tool to perform analysis of chilled water loop. The primary objective of this paper is developing procedure for simulating and optimizing chilled water loop with computer simulation model. A...

Xue, H.; Deng, S.; Claridge, D. E.; Liu, M.

2000-01-01T23:59:59.000Z

377

Vehicle Technologies Office: Active Solicitations  

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

Active Solicitations to Active Solicitations to someone by E-mail Share Vehicle Technologies Office: Active Solicitations on Facebook Tweet about Vehicle Technologies Office: Active Solicitations on Twitter Bookmark Vehicle Technologies Office: Active Solicitations on Google Bookmark Vehicle Technologies Office: Active Solicitations on Delicious Rank Vehicle Technologies Office: Active Solicitations on Digg Find More places to share Vehicle Technologies Office: Active Solicitations on AddThis.com... Active Solicitations To explore current financial opportunity solicitations, click on the opportunity titles in the table below. To sort the list, click on the arrows in the column headings. Technology Solicitation Title Open Date Close Date Hydrogen and Fuel Cells Research and Development for Hydrogen Storage

378

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

Office of Environmental Management (EM)

the process of preparing the APM Deputy Secretary Monthly Report and closing the DOE Reporting Period in PARS II. SCOPE This process applies to the Headquarters Office of...

379

Energy Department Receives Prestigious Closing the Circle Awards...  

Office of Environmental Management (EM)

four White House Closing the Circle (CTC) awards, which recognize federal leadership in green purchasing, electronics recycling, and energy efficiency practices. These awards are...

380

Control-Based Modeling and Simulation of the Chemical-Looping Combustion Process  

Science Journals Connector (OSTI)

The system consists of two fluidized-bed reactors connected through loop seals. ... Son, S. R.; Kim, S. D. Chemical-Looping Combustion with NiO and Fe2O3 in a Thermobalance and Circulating Fluidized Bed Reactor with Double Loops Ind. Eng. ... Garcia-Labiano, F.; de Diego, L.; Adanez, J.; Abad, A.; Gayan, P. Temperature variations in the oxygen carrier particles Turing their reduction and oxidation in a Chemicals-looping combustión system Chem. ...

S. Balaji; Jovan Ilic; B. Erik Ydstie; Bruce H. Krogh

2010-04-13T23:59:59.000Z

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

Investigation of a Canadian Ilmenite as an Oxygen Carrier for Chemical Looping Combustion  

Science Journals Connector (OSTI)

CLC uses an oxygen carrier (OC), usually a metal oxide, to provide oxygen for combusting fuel without the presence of nitrogen from air. ... Chemical-Looping Combustion with NiO and Fe2O3 in a Thermobalance and Circulating Fluidized Bed Reactor with Double Loops ... Application of Fe2O3-Al2O3 Composite Particles as Solid Looping Material of the Chemical-Loop Combustor ...

Fang Liu; Yi Zhang; Liangyong Chen; Dali Qian; James K. Neathery; Saito Kozo; Kunlei Liu

2013-09-23T23:59:59.000Z

382

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

SciTech Connect (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

383

Development of Iron Oxide Carriers for Chemical Looping Combustion Using Sol?Gel  

Science Journals Connector (OSTI)

Development of Iron Oxide Carriers for Chemical Looping Combustion Using Sol?Gel ... Industrial & Engineering Chemistry Research (2008), 47 (6), 1747-1754 CODEN: IECRED; ISSN:0888-5885. ... Ishida, M.; Takeshita, K.; Suzuki, K.; Ohba, T. Application of FeO?AlO composite particles as solid looping material of the chemical-loop combustor Energy Fuels 2005, 19, 2514– 2518 ...

A. M. Kierzkowska; C. D. Bohn; S. A. Scott; J. P. Cleeton; J. S. Dennis; C. R. Müller

2010-04-30T23:59:59.000Z

384

Host Range and Variability of Calcium Binding by Surface Loops in the Capsids of Canine and  

E-Print Network [OSTI]

Host Range and Variability of Calcium Binding by Surface Loops in the Capsids of Canine and Feline, consisting of residues 359 to 375 of the capsid protein. This loop binds a divalent calcium ion in FPV and in the presence or absence of Ca2 . The largest structural difference was found to occur in a ¯exible surface loop

Rossmann, Michael G.

385

Comprehensive computational model of single-and dual-loop optoelectronic  

E-Print Network [OSTI]

Comprehensive computational model of single- and dual-loop optoelectronic oscillators describe a comprehensive computational model for single- loop and dual-loop optoelectronic oscillators amplifiers and oscillators; (230.0250) Optoelectronics; (230.4910) Oscillators. References and links 1. X. S

Horowitz, Moshe

386

Effective SU(2) Polyakov Loop Theories with Heavy Quarks on the Lattice  

E-Print Network [OSTI]

We compare SU(2) Polyakov loop models with different effective actions with data from full two-color QCD simulations around and above the critical temperature. We then apply the effective theories at finite temperature and density to extract quantities like Polyakov loop correlators, effective Polyakov loop potentials and baryon density.

Philipp Scior; David Scheffler; Dominik Smith; Lorenz von Smekal

2014-12-22T23:59:59.000Z

387

Capture of vacancies by extrinsic dislocation loops in silicon S. B. Herner,a)  

E-Print Network [OSTI]

Capture of vacancies by extrinsic dislocation loops in silicon S. B. Herner,a) H.-J. Gossmann, F. H of vacancies in Si by a band of extrinsic dislocation loops has been observed in Sb doping superlattices of vacancies, which enhances the diffusion of Sb spikes located between the surface and loop band

Florida, University of

388

Vacancy clustering and prismatic dislocation loop formation in aluminum Vikram Gavini  

E-Print Network [OSTI]

Vacancy clustering and prismatic dislocation loop formation in aluminum Vikram Gavini Department vacancy clusters with smaller and smaller energy. Further, the results show that a seven vacancy cluster that vacancy clustering leads to prismatic loop, and that these loops can be stable at extremely small sizes

Bhattacharya, Kaushik

389

Synthesizing Transformations for Locality Enhancement of Imperfectly-nested Loop Nests  

E-Print Network [OSTI]

Synthesizing Transformations for Locality Enhancement of Imperfectly-nested Loop Nests Nawaaz Ahmed in imperfectly-nested loops. The key idea is to em- bed the iteration space of every statement in a loop nest into a spe- cial iteration space called the product space. The product space can be viewed as a perfectly-nested

Pingali, Keshav K.

390

Observation of critical slowing down close to a roughening transition (*)  

E-Print Network [OSTI]

L-159 Observation of critical slowing down close to a roughening transition (*) L. Puech, B. Hebral growing process, close to the roughening transition of the facet (TR ~ 215 mK). These times exhibit the existence of a so-called « Roughening-Transition » on the fluid-solid interface of pure com- pounds, studies

Boyer, Edmond

391

Separation of Azeotropic Mixtures in Closed Batch Distillation Arrangements  

E-Print Network [OSTI]

Separation of Azeotropic Mixtures in Closed Batch Distillation Arrangements S. Skouras and S, Norway SCOPE OF THE PROJECT ·How can we separate ternary mixtures in closed batch distillation-up period is required, followed by a heteroazeotropic distillation step (Figure 3) Modified: The separation

Skogestad, Sigurd

392

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

393

Microsoft Word - DOE Report on OSU Looping final.doc  

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

394

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

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

395

Magnetic Bianchi I Universe in Loop Quantum Cosmology  

E-Print Network [OSTI]

We examine the dynamical consequences of homogeneous cosmological magnetic fields in the framework of loop quantum cosmology. We show that a big-bounce occurs in a collapsing magnetized Bianchi I universe, thus extending the known cases of singularity-avoidance. Previous work has shown that perfect fluid Bianchi I universes in loop quantum cosmology avoid the singularity via a bounce. The fluid has zero anisotropic stress, and the shear anisotropy in this case is conserved through the bounce. By contrast, the magnetic field has nonzero anisotropic stress, and shear anisotropy is not conserved through the bounce. After the bounce, the universe enters a classical phase. The addition of a dust fluid does not change these results qualitatively.

Roy Maartens; Kevin Vandersloot

2008-12-10T23:59:59.000Z

396

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

397

CFD model for the simulation of chemical looping combustion  

Science Journals Connector (OSTI)

Abstract A chemical looping combustion (CLC) system uses a metal oxide solid carrier to combust a source of fuel in isolation from the source of oxygen which produces an exhaust gas of primarily carbon dioxide and water. In this work, a full three-dimensional model of a chemical looping combustion system was developed to simulate the particle–fluid hydrodynamics, thermal characteristics, and reaction efficiency of the CLC system using coal particles as a fuel source. Multiple heterogeneous and homogenous reactions are considered in the CLC model including the oxidation and reduction reactions of the metal oxide carrier and gasification reactions. Within each coal particle, the temperature-dependent devolatilization, moisture release, and particle swelling effects are included. Modeling results showing fluidization regimes, circulation rate, reactor efficiencies, and temperature profiles are presented to demonstrate the utility of the model.

James M. Parker

2014-01-01T23:59:59.000Z

398

Instanton calculus and loop operator in supersymmetric gauge theory  

Science Journals Connector (OSTI)

We compute the one-point function of the glueball loop operator in the maximally confining phase of supersymmetric gauge theory using instanton calculus. In the maximally confining phase the residual symmetry is the diagonal U(1) subgroup and the localization formula implies that the chiral correlation functions are the sum of the contributions from each fixed point labeled by the Young diagram. The summation can be performed exactly by operator formalism of free fermions, which is also featured in the equivariant Gromov-Witten theory of P1. By taking the Laplace transformation of the glueball loop operator, we find an exact agreement with the previous results for the generating function (resolvent) of the glueball one-point functions.

Hiroaki Kanno and Sanefumi Moriyama

2008-06-02T23:59:59.000Z

399

Effect of charmed meson loops on charmonium transitions  

Science Journals Connector (OSTI)

The effects of intermediate charmed mesons on charmonium transitions with the emission of one pion or eta are studied systematically. Based on a nonrelativistic effective field theory we show that charmed meson loops are enhanced compared to the corresponding tree-level contributions for transitions between two S-wave charmonia as well as for transitions between two P-wave charmonia. On the contrary, for the transitions between one S-wave and one P-wave charmonium state, the loops need to be analyzed case by case and often appear to be suppressed. The relation to and possible implications for an effective Lagrangian approach are also discussed. This study at the same time provides a cross-check for the numerical evaluations.

Feng-Kun Guo; C. Hanhart; Gang Li; Ulf-G. Meißner; Qiang Zhao

2011-02-11T23:59:59.000Z

400

On Resumming Inflationary Perturbations beyond One-loop  

E-Print Network [OSTI]

It is well known that the correlation functions of a scalar field in a quasi-de Sitter space exhibit at the loop level cumulative infra-red effects proportional to the total number of e-foldings of inflation. Using the in-in formalism, we explore the behavior of these infra-red effects in the large N limit of an O(N) invariant scalar field theory with quartic self-interactions. By resumming all higher-order loop diagrams non-perturbatively, we show that the connected four-point correlation function, which is a signal of non-Gaussianity, is non-perturbatively enhanced with respect to its tree-level value.

Antonio Riotto; Martin S. Sloth

2008-04-08T23:59:59.000Z

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

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

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

402

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

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

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

403

A new algorithm for detecting erroneous loop detector data  

E-Print Network [OSTI]

December 1999 Major Subject: Mechanical Engineering A NEW ALGORITHM FOR DETECTING ERRONEOUS LOOP DETECTOR DATA by SHAIVAL GUPTA Submitted to Texas ARM University in partial ful611ment of the requirements for the degree of MASTER OF SCIENCE... Approved as to style and content by: Darbha Swaroop (Chair of Committee) S. P. Bhattacharyya (Member) Reza gari (Member) Q. K. ~ Suhada Jayssuriya (Head of Department) December 1999 Major Subject: Mechanical Engineering ABSTRACT A New Algorithm...

Gupta, Shaival

2012-06-07T23:59:59.000Z

404

Single-loop controllers bring boilers in line  

SciTech Connect (OSTI)

The boiler process seems simple. Some type of fuel is burned in the presence of air, forming heat and combustion gases. The heat is then absorbed by the boiler drum and transferred to the water inside. The heated water changes to steam and is exhausted, which spins an electrical turbine that produces electricity, and exhausts lower pressure steam for condensing in the process. Although this process seems simple, anything could go wrong at any time. The flame could go out, the fuel could run low, or the drum could get dirty. Let`s take a look at how to avoid these problems. The first step is to take accurate measurements. Typically, these measurements include flow, pressure, conductivity, temperature, stack analysis, and a level or two. Ambient conditions can affect performance of each measuring device, so be sure to consider the hot, drafty conditions of boiler houses when selecting/installing devices. The second step is to bring the measurement signals back to the control room. Use two-wire, loop-powered devices to transmit all signals except the stack analysis signals. Two-wire, loop-powered technology increases reliability, lowers installation costs, and eliminates ground loops. Signal conditioning takes place at the microcontroller input points. Signal conditioning is done to provide a linear, overall loop response to the controller. It also simplified measurement. Examining four types of input signal characterization will help explain the signal conditioning process. The first signal is a zero-based pressure signal with a linear characteristic. The second is a temperature measurement made by a thermocouple whose output is nonlinear. Next is a flow measurement made with a conventional d/p cell and orifice plate. It needs a square root characterization. Last is a combustion air flow measurement from the pressure drop across part of the boiler or preheater. This flow measurement is quite tricky because of a large deviation from the simple square root relationship.

Harrelson, D.; Piechota, B.

1995-08-01T23:59:59.000Z

405

Automated one-loop calculations: a proof of concept  

E-Print Network [OSTI]

An algorithm, based on the OPP reduction method, to automatically compute any one-loop amplitude, for all momentum, color and helicity configurations of the external particles, is presented. It has been implemented using the tree-order matrix element code HELAC and the OPP reduction code CutTools. As a demonstration of the potential of the current implementation, results for all sub-processes included in the 2007 Les Houches wish list for LHC, are presented.

A. van Hameren; C. G. Papadopoulos; R. Pittau

2009-03-26T23:59:59.000Z

406

Higher rank Wilson loops from a matrix model  

E-Print Network [OSTI]

We compute the circular Wilson loop of N=4 SYM theory at large N in the rank k symmetric and antisymmetric tensor representations. Using a quadratic Hermitian matrix model we obtain expressions for all values of the 't Hooft coupling. At large and small couplings we give explicit formulae and reproduce supergravity results from both D3 and D5 branes within a systematic framework.

Sean A. Hartnoll; S. Prem Kumar

2006-05-16T23:59:59.000Z

407

Onset of Electron Acceleration in a Flare Loop  

E-Print Network [OSTI]

We carried out detailed analysis of X-ray and radio observations of a simple flare loop that occurred on 12th August 2002, with the impulsive hard X-ray (HXR) light curves dominated by a single pulse. The emission spectra of the early impulsive phase are consistent with an isothermal model in the coronal loop with a temperature reaching several keVs. A power-law high-energy spectral tail is evident near the HXR peak time, in accordance with the appearance of footpoints at high energies, and is well correlated with the radio emission. The energy content of the thermal component keeps increasing gradually after the disappearance of this nonthermal component. These results suggest that electron acceleration only covers a central period of a longer and more gradual energy dissipation process and that the electron transport within the loop plays a crucial role in the formation of the inferred power-law electron distribution. The spectral index of power-law photons shows a very gradual evolution indicating a quasi-...

Sharykin, I N; Fletcher, L

2014-01-01T23:59:59.000Z

408

Mass, energy, and exergy balance analysis of chemical looping with oxygen uncoupling (CLOU) process  

Science Journals Connector (OSTI)

Abstract Chemical looping with oxygen uncoupling (CLOU) is a promising concept for efficient combustion of solid fuels with an inherent capture of the greenhouse gas CO 2 . This paper presents a CLOU process scheme with stoichiometric mass, energy, and exergy balances. A CLOU reactor system using medium volatile bituminous coal as fuel and silica-supported CuO as an oxygen carrier is analyzed. The analysis includes the estimation of various design and operational parameters, thermal considerations, and evaluation of the overall performance. The operation of a reactor system of two interacting circulating fluidized beds (CFBs) is greatly influenced by the hydrodynamics. For the CuO oxygen carrier, the hydrodynamic operating range appeared feasible considering the maximum solid circulation rates in current CFB boilers. Depending upon the reactor temperatures, oxygen carrier inventories of 400–680 kg/MW in the system were found necessary for stoichiometric combustion of the fuel. The temperature difference between the reactors should not exceed 50 °C, as otherwise, problems may arise with the heat balance. Exergetic efficiencies in the range of 63–70% were obtained for different combinations of relevant design parameters. It is evident that the possible operating conditions in the system are closely related to the properties of the chosen oxygen carrier. However, the calculation procedure and design criteria presented here are applicable to any oxygen carrier to be used in the process.

Petteri Peltola; Tero Tynjälä; Jouni Ritvanen; Timo Hyppänen

2014-01-01T23:59:59.000Z

409

DOE Closes Investigation of Arcelik's Blomberg Refrigerator | Department of  

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

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

410

A Closed-Loop Process from Microwave-Assisted Hydrothermal Degradation of Starch to Utilization of the Obtained Degradation Products as Starch Plasticizers  

Science Journals Connector (OSTI)

Girisuta, B.; Danon, B.; Manurung, R.; Janssen, L.; Heeres, H.Experimental and kinetic modelling studies on the acid-catalysed hydrolysis of the water hyacinth plant to levulinic acid Bioresour. ... Girisuta, B.; Danon, B.; Manurung, R.; Janssen, L. P. B. M.; Heeres, H. J. ...

Duo Wu; Minna Hakkarainen

2014-08-06T23:59:59.000Z

411

Home use of closed loop insulin delivery improves overnight glucose control in adults with type 1 diabetes: A four-week multicentre randomised crossover study  

E-Print Network [OSTI]

system 21 comprised a model predictive control (MPC) algorithm residing on a handheld computer linked by cable to the continuous glucose monitoring receiver. Every 12 minutes, the treat-to-target algorithm calculated a new insulin infusion rate, which... that limited maximum insulin infusion and suspended insulin delivery if glucose was at or below 4·3mmol/l or when glucose was rapidly decreasing. Algorithm version 0·3·24 was used (University of Cambridge). Assays 6 We used a chemiluminescence...

Thabit, Hood; Lubina-Solomon, Alexandra; Stadler, Marietta; Leelarathna, Lalantha; Walkinshaw, Emma; Pernet, Andrew; Allen, Janet M.; Iqbal, Ahmed; Choudhary, Pratik; Kumareswaran, Kavita; Nodale, Marianna; Nisbet, Chloe; Wilinska, Malgorzata E.; Barnard, Katherine D.; Dunger, David B.; Heller, Simon R.; Amiel, Stephanie A.; Evans, Mark L.; Hovorka, Roman

2014-06-16T23:59:59.000Z

412

Intelligent Control of Closed-Loop Sedation in Simulated ICU Patients Brett L. Moore, Eric D. Sinzinger, Todd M. Quasny, and Larry D. Pyeatt  

E-Print Network [OSTI]

to anesthesia control with favorable results (Hu, Lovejoy, & Shafer 1994). Background Target Controlled Infusion; the system then dispenses the drug at a combination of bo- lus and maintenance infusion rates to achieve and main- tain the desired level. The TCI system selects an infusion rate based on a precomputed drug

Pyeatt, Larry

413

A mathematical model for the simulation of closed-loop earth-coupled heat exchangers for a water source heat pump  

E-Print Network [OSTI]

and Braud, 1986). Conditions in Texas are well suited for earth-coupled heat pumps. Groundwater temperatures across Texas range from 17 to 22 'C (Kemler, 1947). Hildenbrandt and Elite t (1979) found that this temperature range gives a high coefficient... the element is (Dusinberre, 1961): (TF. + TF. where: Qout the rate at which heat leaves the element, W; h = a surface heat transfer coefficient, W/m2 'C; As = the pipe surface area in contact with the fluid, m2; TPS = the temperature of the pipe surface...

De Lange, Kevin Jon

1988-01-01T23:59:59.000Z

414

Towards closed-loop glycaemic control Tom Van Herpe, PhD, Doctor a,*, Bart De Moor, PhD, Professor a  

E-Print Network [OSTI]

of Electrical Engineering (ESAT­SCD), Kasteelpark Arenberg 10, B-3001 Heverlee (Leuven), Belgium b Katholieke practice for critically ill patients. New algorithms, ranging from basic protocols to elementary computer. Introduction Critically ill patients, typically admitted to the ICU, show hyperglycaemia and insulin resistance

415

Energy Department Receives Prestigious Closing the Circle Awards for  

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

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

416

Energy Department Closes Buy American Investigation into Lighting Sales |  

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

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

417

Chimneys: Keep 'em Clean... and Closed | Department of Energy  

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

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,

418

DOE Closes Investigation into Alleged Lighting Efficiency Violations |  

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

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

419

Energy Department Receives Prestigious Closing the Circle Awards for  

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

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

420

DOE Closes Investigation into Energy Efficiency of Viking Refrigerator |  

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

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

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

Game Preserves and Closed Areas (Montana) | Department of Energy  

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

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

422

Knowledge Compilation for Closed World Reasoning and Circumscription  

Science Journals Connector (OSTI)

...Copyright 2001 Article Knowledge Compilation for Closed World Reasoning...world reasoning (CWR) from tractable knowledge bases (KBs). Both (basic) CWR...Accordingly, our results suggest knowledge compilation as a valuable, practical......

Sylvie Coste-Marquis; Pierre Marquis

2001-08-01T23:59:59.000Z

423

SunShot Summit Registration Closes May 9  

Broader source: Energy.gov [DOE]

As a reminder, online registration for the SunShot Grand Challenge Summit closes Friday, May 9. We kindly ask that all interested participants please register by the deadline.

424

Energy Department Closes Buy American Investigation into Lighting Sales |  

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

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

425

SHATTERING FLARES DURING CLOSE ENCOUNTERS OF NEUTRON STARS  

SciTech Connect (OSTI)

We demonstrate that resonant shattering flares can occur during close passages of neutron stars in eccentric or hyperbolic encounters. We provide updated estimates for the rate of close encounters of compact objects in dense stellar environments, which we find are substantially lower than given in previous works. While such occurrences are rare, we show that shattering flares can provide a strong electromagnetic counterpart to the gravitational wave bursts expected from such encounters, allowing triggered searches for these events to occur.

Tsang, David, E-mail: dtsang@physics.mcgill.ca [Department of Physics, McGill University, Montreal, QC (Canada)

2013-11-10T23:59:59.000Z

426

One-loop divergences in massive gravity theory  

E-Print Network [OSTI]

The one-loop divergences are calculated for the recently proposed ghost-free version of massive gravity, where the action depends on both metric and external tensor field f. The non-polynomial structure of the massive term is reduced to a more standard form by means of auxiliary tensor field, which is settled on-shell after quantum calculations are performed. As one should expect, the counterterms do not reproduce the form of the classical action. Moreover, the result has the form of the power series in f.

Ioseph L. Buchbinder; Dante D. Pereira; Ilya L. Shapiro

2012-01-16T23:59:59.000Z

427

Loop Quantum Gravity and Cosmology: A dynamical introduction  

E-Print Network [OSTI]

Loop quantum gravity and cosmology are reviewed with an emphasis on evaluating the dynamics, rather than constructing it. The three crucial parts of such an analysis are (i) deriving effective equations, (ii) controlling the theory's microscopic degrees of freedom that lead to its spatial discreteness and refinement, and (iii) ensuring consistency and anomaly-freedom. All three issues are crucial for making the theory testable by conceptual and observational means, and they remain challenging. Throughout this review, the Hamiltonian nature of the theory will play a large role for properties of space-time structure within the framework discussed.

Bojowald, Martin

2011-01-01T23:59:59.000Z

428

DOE/NETL ADVANCED COMBUSTION SYSTEMS: CHEMICAL LOOPING SUMMARY  

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

429

Transcript: OSTI's E-print Network Now Boasts Close to 1 Million Documents,  

Office of Scientific and Technical Information (OSTI)

Transcript: OSTI's E-print Network Now Boasts Close to 1 Million Documents, Transcript: OSTI's E-print Network Now Boasts Close to 1 Million Documents, Office of Scientific and Technical Information, U.S. Department of Energy, www.osti.gov March 2007 E-Print Network Listen Now Where can you find full-text access to approximately 1 million scientific e-print documents? Where can you gain entry to more than 22,000 scientific Web sites organized by discipline, and link to more than 2,900 relevant scientific societies? Visit the E-print Network. The E-print Network is rapidly approaching 1 million documents. The scientific and technical information for this vast, integrated communications hub was created by scientists and research engineers active in their respective fields. E-print Network is intended for use by other scientists, engineers, and students at advanced levels.

430

Photon Sciences Directorate | 2010 Annual Report | Close-Up: NSLS Users  

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

Close-Up: NSLS Users Close-Up: NSLS Users From Alabama to Australia, more than 2,200 visiting scientists from over 400 institutions came to NSLS to conduct their research in FY10, exactly 700 of which were new to the facility. These scientists, known as "users," primarily are awarded beam time by submitting a general user proposal through a peer-reviewed, web-based system. The proposal is rated based on various scientific criteria and can remain active for up to six cycles of operation (about two years). In FY10, about 1,000 requests for beam time were submitted, with about one-third of those requests on new proposals. Beam time is given without charge, as long as the research results are published in open literature. Work that is proprietary in nature is charged on a full-cost recovery basis

431

Ligand-Dependent Disorder of Loop Observed in Extended-Spectrum SHV-Type beta-Lactamase  

SciTech Connect (OSTI)

Among Gram-negative bacteria, resistance to {beta}-lactams is mediated primarily by {beta}-lactamases (EC 3.2.6.5), periplasmic enzymes that inactivate {beta}-lactam antibiotics. Substitutions at critical amino acid positions in the class A {beta}-lactamase families result in enzymes that can hydrolyze extended-spectrum cephalosporins, thus demonstrating an 'extended-spectrum' {beta}-lactamase (ESBL) phenotype. Using SHV ESBLs with substitutions in the {Omega} loop (R164H and R164S) as target enzymes to understand this enhanced biochemical capability and to serve as a basis for novel {beta}-lactamase inhibitor development, we determined the spectra of activity and crystal structures of these variants. We also studied the inactivation of the R164H and R164S mutants with tazobactam and SA2-13, a unique {beta}-lactamase inhibitor that undergoes a distinctive reaction chemistry in the active site. We noted that the reduced K{sub i} values for the R164H and R164S mutants with SA2-13 are comparable to those with tazobactam (submicromolar). The apo enzyme crystal structures of the R164H and R164S SHV variants revealed an ordered {Omega} loop architecture that became disordered when SA2-13 was bound. Important structural alterations that result from the binding of SA2-13 explain the enhanced susceptibility of these ESBL enzymes to this inhibitor and highlight ligand-dependent {Omega} loop flexibility as a mechanism for accommodating and hydrolyzing {beta}-lactam substrates.

J Sampson; W Ke; C Bethel; S Pagadala; M Nottingham; R Bonomo; J Buynak; F van den Akker

2011-12-31T23:59:59.000Z

432

A thermodynamic analysis of alternative approaches to chemical looping combustion  

SciTech Connect (OSTI)

In this article, we review and clarify some of the points made by previous authors regarding chemical looping combustion (CLC). While much of the recent interest in chemical looping combustion has been associated with carbon sequestration, our primary interest here is its potential to increase the thermodynamic efficiency of converting fuel chemical energy into useful work. We expand on several points about the details of CLC that we feel have not previously been sufficiently explored, and suggest alternative (and possibly more practical) approaches that exploit some of the same thermodynamic concepts. We illustrate our key points with {First} and {Second} Law analyses of ideal conceptual processes, which in addition to {CLC} also include isothermal, non-equilibrium, preheated combustion and combustion with thermochemical recuperation. Our results suggest that a significant portion of the potential efficiency benefit of CLC might be achieved without the need to handle and transport large quantities of solid oxygen storage material. Exploitation of this fact may lead to higher efficiency approaches for power generation from hydrocarbon fuels combustion.

Chakravarthy, Veerathu K [ORNL; Daw, C Stuart [ORNL; Pihl, Josh A [ORNL

2011-01-01T23:59:59.000Z

433

Chemical Looping Combustion System-Fuel Reactor Modeling  

SciTech Connect (OSTI)

Chemical looping combustion (CLC) is a process in which an oxygen carrier is used for fuel combustion instead of air or pure oxygen as shown in the figure below. The combustion is split into air and fuel reactors where the oxidation of the oxygen carrier and the reduction of the oxidized metal occur respectively. The CLC system provides a sequestration-ready CO2 stream with no additional energy required for separation. This major advantage places combustion looping at the leading edge of a possible shift in strict control of CO2 emissions from power plants. Research in this novel technology has been focused in three distinct areas: techno-economic evaluations, integration of the system into power plant concepts, and experimental development of oxygen carrier metals such as Fe, Ni, Mn, Cu, and Ca. Our recent thorough literature review shows that multiphase fluid dynamics modeling for CLC is not available in the open literature. Here, we have modified the MFIX code to model fluid dynamic in the fuel reactor. A computer generated movie of our simulation shows bubble behavior consistent with experimental observations.

Gamwo, I.K.; Jung, J. (ANL); Anderson, R.R.; Soong, Y.

2007-04-01T23:59:59.000Z

434

Dry Dilution Refrigerator with He-4 Precool Loop  

E-Print Network [OSTI]

He-3/He-4 dilution refrigerators (DR) are very common in sub-Kelvin temperature research. We describe a pulse tube precooled DR where a separate He-4 circuit condenses the He-3 of the dilution loop. Whereas in our previous work the dilution circuit and the He-4 circuit were separate, we show how the two circuits can be combined. Originally, the He-4 loop with a base temperature of ~ 1 K was installed to make an additional cooling power of up to 100 mW available to cool cold amplifiers and electrical lines. In the new design, the dilution circuit is run through a heat exchanger in the vessel of the He-4 circuit so that the condensation of the He-3 stream of the DR is done by the He-4 stage. A much reduced condensation time (factor of 2) of the He-3/He-4 gas mixture at the beginning of an experiment is achieved. A compressor is no longer needed with the DR as the condensation pressure remains below atmospheric pressure at all times; thus the risk of losing expensive He-3 gas is small. The performance of the DR ...

Uhlig, K

2014-01-01T23:59:59.000Z

435

Dry dilution refrigerator with 4He-1K-loop  

E-Print Network [OSTI]

In this article we summarize experimental work on cryogen-free 3He/4He dilution refrigerators which, in addition to the dilution refrigeration circuit, are equipped with a 4He-1K-stage. This type of DR becomes worth considering when high cooling capacities are needed at T ~ 1 K to cool cold amplifiers and heat sink cables. In our application, the motivation for the construction of this type of cryostat was to do experiments on superconducting quantum circuits for quantum information technology and quantum simulations. In other work, DRs with 1K-stage were proposed for astro-physical cryostats. For neutron scattering research, a top-loading cryogen-free DR with 1K-stage was built which was equipped with a standard commercial dilution refrigeration insert. Cooling powers of up to 100 mW have been reached with our 1K-stage, but higher refrigeration powers were achieved with more powerful pulse tube cryocoolers and higher 4He circulation rates in the 1K-loop. Several different versions of a 1K-loop have been test...

Uhlig, Kurt

2014-01-01T23:59:59.000Z

436

Diamagnetic loop measurement in Korea Superconducting Tokamak Advanced Research machine  

SciTech Connect (OSTI)

Diamagnetic loop (DL), which consists of two poloidal loops inside the vacuum vessel, is used to measure the diamagnetic flux during a plasma discharge in the Korea Superconducting Tokamak Advanced Research (KSTAR) machine. The vacuum fluxes in the DL signal can be compensated up to 0.1 mWb by using the coefficients, which are obtained from experimental investigations, in the vacuum flux measurements during vacuum shots under same operational conditions of magnetic coils for plasma experiment in the KSTAR machine. The maximum error in the diamagnetic flux measurement due to the errors of the coefficients was estimated as {approx}0.22 mWb. From the diamagnetic flux measurements for the ohmically heated circular plasmas in the KSTAR machine, the stored energy agrees well with the estimated kinetic energy within the discrepancy of 25%. When the electron cyclotron heating, the neutral beam injection, and the ion cyclotron resonance heating are added to the ohmically heated limiter plasmas, the additional heating effects can be clearly observed from the increase of the stored energy evaluated in the DL measurement.

Bak, J. G.; Lee, S. G.; Kim, H. S. [National Fusion Research Institute, Gwahangno 113, Yuseong-Gu, Daejeon 305-333 (Korea, Republic of)

2011-06-15T23:59:59.000Z

437

Model based Open-loop Correction of Heliostat Tracking Errors  

Science Journals Connector (OSTI)

Abstract The heliostat field is by far the most expensive part of a typical Central Receiver (CR) plant. To achieve high conversion efficiencies, heliostats with very high tracking accuracy are needed, but errors are introduced due to manufacturing-, installation- and alignment tolerances as well control system granularity. Mechanical error profiles are unique for every heliostat and cause tracking errors that vary over the course of days and seasons and therefore cannot be corrected by once-off angle offset corrections. Developments in microcontroller technology drives decentralization of CR control systems. Powerful open-loop error correction algorithms can run on low cost heliostat local controllers, enabling high tracking accuracy from lower cost heliostats with reduced tolerances. A prototype array of 18 heliostats, each 1 ft2 in size, was constructed to validate the field control system functionality and final tracking accuracy. Tests were conducted at SU's solar laboratory with an 18m tower and heliostat slant ranges of around 40 m. Prototype experiments indicate a daily open-loop RMS normal vector tracking error below 1 mrad. Strong correlation exists between successive days’ residual error curves, indicating that further model refinements may be possible, including frequency spectrum analysis (using FFT) to identify and correct for mechanism-specific periodic drivetrain errors.

K. Malan; P. Gauché

2014-01-01T23:59:59.000Z

438

New two-loop contributions to hadronic EDMs in the MSSM  

SciTech Connect (OSTI)

We discuss the quark EDMs and CEDMs in the MSSM with general flavor-changing terms in the squark mass matrices. In particular, the charged-Higgs mediated contributions to the down-quark EDM and CEDM are evaluated at two-loop level. We point out that these two-loop contributions may dominate over the one-loop induced gluino contribution even when the squark and gluino masses are around few TeV and tan {beta} is moderate.

Nagai, Minoru [ICRR, University of Tokyo, Kashiwa 277-8582 (Japan)

2007-11-20T23:59:59.000Z

439

Kinetics of Iron Ore Reduction by Methane for Chemical Looping Combustion  

Science Journals Connector (OSTI)

Kinetics of Iron Ore Reduction by Methane for Chemical Looping Combustion ... Chemical-looping combustion (CLC) is a promising concept that can be used in power generation, which integrates power production and CO2 capture. ... With this in mind, chemical-looping combustion (CLC) is a promising concept that can be used in power generation, with the inherent capture of CO2 during the process cycle. ...

Somaye Nasr; Kevin P. Plucknett

2014-01-20T23:59:59.000Z

440

E-Print Network 3.0 - advanced loop type Sample Search Results  

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

Collection: Computer Technologies and Information Sciences 6 Removing Impediments to Loop Fusion through Code Transformations Summary: determinant of overall performance. Compilers...

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

Progress in an oxygen-carrier reaction kinetics experiment for rotary-bed chemical looping combustion .  

E-Print Network [OSTI]

??The design process for an experimental platform measuring reaction kinetics in a chemical looping combustion (CLC) process is documented and justified. To enable an experiment… (more)

Jester-Weinstein, Jack (Jack L.)

2013-01-01T23:59:59.000Z

442

Mechanism of Methane Chemical Looping Combustion with Hematite Promoted with CeO2  

Science Journals Connector (OSTI)

Mechanism of Methane Chemical Looping Combustion with Hematite Promoted with CeO2 ... Industrial & Engineering Chemistry Research2014 53 (42), 16341-16348 ...

Duane D. Miller; Ranjani Siriwardane

2013-02-28T23:59:59.000Z

443

Promoting the Reduction Reactivity of Ilmenite by Introducing Foreign Ions in Chemical Looping Combustion  

Science Journals Connector (OSTI)

Promoting the Reduction Reactivity of Ilmenite by Introducing Foreign Ions in Chemical Looping Combustion ... Industrial & Engineering Chemistry Research2014 53 (39), 15157-15166 ...

Jinhua Bao; Zhenshan Li; Ningsheng Cai

2013-04-15T23:59:59.000Z

444

Reducible Supports for Ni-based Oxygen Carriers in Chemical Looping Combustion  

Science Journals Connector (OSTI)

Reducible Supports for Ni-based Oxygen Carriers in Chemical Looping Combustion ... Industrial & Engineering Chemistry Research2014 53 (42), 16341-16348 ...

Saurabh Bhavsar; Götz Veser

2013-03-29T23:59:59.000Z

445

Investigation of Chemical Looping Combustion of Coal with CuFe2O4 Oxygen Carrier  

Science Journals Connector (OSTI)

Investigation of Chemical Looping Combustion of Coal with CuFe2O4 Oxygen Carrier ... Industrial & Engineering Chemistry Research2013 52 (5), 1795-1805 ...

Baowen Wang; Rong Yan; Haibo Zhao; Ying Zheng; Zhaohui Liu; Chuguang Zheng

2011-06-15T23:59:59.000Z

446

Reducible Oxide Based Oxygen Carriers for Chemical Looping Combustion and Partial Oxidation of Methane.  

E-Print Network [OSTI]

??Chemical looping combustion (CLC) is a novel combustion technology that offers a highly efficient route towards clean combustion of fuel with inherent CO2 capture. In… (more)

Bhavsar, Saurabh

2014-01-01T23:59:59.000Z

447

Kinetics of Hematite to Wüstite by Hydrogen for Chemical Looping Combustion  

Science Journals Connector (OSTI)

Kinetics of Hematite to Wüstite by Hydrogen for Chemical Looping Combustion ... Industrial & Engineering Chemistry Research (1989), 28 (8), 1130-40 CODEN: IECRED; ISSN:0888-5885. ...

Esmail R. Monazam; Ronald W. Breault; Ranjani Siriwardane

2014-07-01T23:59:59.000Z

448

Tracking Phaselock Loop Characteristics with a VCO Using a Barium Strontium Titanate (BST)  

E-Print Network [OSTI]

Tracking Phaselock Loop Characteristics with a VCO Using a Barium Strontium Titanate (BST) Thin Strontium Titanate (BST) varactors utilized in a VCO demonstrate unique tuning characteristics compared

449

New one-loop techniques and first applications to LHC phenomenology  

E-Print Network [OSTI]

In this talk we describe our approach for the computation of multi-leg one-loop amplitudes and present some first results relevant for LHC phenomenology.

T. Binoth; A. Guffanti; J. -Ph. Guillet; S. Karg; N. Kauer; T. Reiter

2006-06-30T23:59:59.000Z

450

Testing of a loop heat pipe experimental apparatus under varied acceleration.  

E-Print Network [OSTI]

??An experimental apparatus was designed and fabricated to test a Loop Heat Pipe under varied acceleration. The experiment consisted of both flight and ground testing… (more)

Kurwitz, Richard Cable

2012-01-01T23:59:59.000Z

451

The Office of Electricity Delivery and Energy Reliability is Closely  

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

The Office of Electricity Delivery and Energy Reliability is The Office of Electricity Delivery and Energy Reliability is Closely Monitoring Hurricane Irene (2011) The Office of Electricity Delivery and Energy Reliability is Closely Monitoring Hurricane Irene (2011) August 25, 2011 - 11:13am Addthis The Department of Energy's (DOE) Office of Electricity Delivery and Energy Reliability (OE) is closely monitoring Hurricane Irene as it travels up the U.S. coast and is publishing Situation Reports. Addthis Related Articles Sandy made landfall as a post-tropical cyclone on the southern coast of New Jersey near Atlantic City at 8 p.m. on October 29, with top sustained winds of 80 mph. | Photo courtesy of NOAA. Responding To Hurricane Sandy: DOE Situation Reports On November 7, a Nor'easter began to impact the Mid-Atlantic and Northeast with strong winds, rain or snow, and coastal flooding. | Photo courtesy of NOAA.

452

When Galaxies Collide: Ripples Indicate Recent Impact Close to Home |  

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

When Galaxies Collide: Ripples Indicate Recent Impact Close to Home When Galaxies Collide: Ripples Indicate Recent Impact Close to Home When Galaxies Collide: Ripples Indicate Recent Impact Close to Home June 28, 2012 - 11:16am Addthis This is a graphic representation of the Milky Way, the galaxy in which Earth is contained. Scientists know of more than 20 visible satellite galaxies that circle the center of the Milky Way, with masses ranging from one million to one billion solar masses. Occasionally, one of these orbiting galaxies pass through the Milky Way making waves for millennia. | Graphic courtesy of NASA This is a graphic representation of the Milky Way, the galaxy in which Earth is contained. Scientists know of more than 20 visible satellite galaxies that circle the center of the Milky Way, with masses ranging from

453

Solar Storm Closely Watched Worldwide | Department of Energy  

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

Solar Storm Closely Watched Worldwide Solar Storm Closely Watched Worldwide Solar Storm Closely Watched Worldwide March 9, 2012 - 10:14am Addthis While this week's solar storm captures the interest of scientists, researchers and people around the world, the Energy Department works with others to monitor the storm's potential impact on the nation's electrical grid. | Image credit: NOAA. While this week's solar storm captures the interest of scientists, researchers and people around the world, the Energy Department works with others to monitor the storm's potential impact on the nation's electrical grid. | Image credit: NOAA. Kenneth Friedman Senior Policy Advisor in the Office of Electricity Delivery and Energy Reliability The solar storm that is capturing the interest of scientists, researchers

454

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

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

of Whirlpool's Maytag Refrigerator 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

455

Idaho Site Closes Out Decontamination and Decommissioning Project about  

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

Site Closes Out Decontamination and Decommissioning Project Site Closes Out Decontamination and Decommissioning Project about $440 Million under Cost Idaho Site Closes Out Decontamination and Decommissioning Project about $440 Million under Cost November 8, 2012 - 12:00pm Addthis Workers demolish the Test Area North Hot Shop Complex, shown here. Workers demolish the Test Area North Hot Shop Complex, shown here. Crews demolish CPP-601, a building used during used nuclear fuel reprocessing at the Idaho Nuclear Technology and Engineering Center. Crews demolish CPP-601, a building used during used nuclear fuel reprocessing at the Idaho Nuclear Technology and Engineering Center. The Engineering Test Reactor vessel is shown here removed, loaded and ready for transport to the on-site landfill. The Engineering Test Reactor vessel is shown here removed, loaded and ready

456

2007 Solar Decathlon Closing Ceremony and Awards | Department of Energy  

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

2007 Solar Decathlon Closing Ceremony and Awards 2007 Solar Decathlon Closing Ceremony and Awards 2007 Solar Decathlon Closing Ceremony and Awards October 19, 2007 - 3:21pm Addthis Remarks as Prepared for Secretary Bodman Thank you, Andy. I want to thank you once again for your leadership in making the Solar Decathlon such a success. The Solar Decathlon is now a permanent part of America. I also want to thank everyone sponsors, DOE employees, Members of Congress, any parents and faculty who might be with us and anyone else who came out this week in support of our decathletes. This has really been a remarkable event, one that has attracted crowds like we have not seen before. I've seen people from all over the country and from all walks of life down here on the Mall, keenly interested in the houses and the decathletes.

457

When Galaxies Collide: Ripples Indicate Recent Impact Close to Home |  

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

When Galaxies Collide: Ripples Indicate Recent Impact Close to Home When Galaxies Collide: Ripples Indicate Recent Impact Close to Home When Galaxies Collide: Ripples Indicate Recent Impact Close to Home June 28, 2012 - 11:16am Addthis This is a graphic representation of the Milky Way, the galaxy in which Earth is contained. Scientists know of more than 20 visible satellite galaxies that circle the center of the Milky Way, with masses ranging from one million to one billion solar masses. Occasionally, one of these orbiting galaxies pass through the Milky Way making waves for millennia. | Graphic courtesy of NASA This is a graphic representation of the Milky Way, the galaxy in which Earth is contained. Scientists know of more than 20 visible satellite galaxies that circle the center of the Milky Way, with masses ranging from

458

2007 Solar Decathlon Closing Ceremony and Awards | Department of Energy  

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

7 Solar Decathlon Closing Ceremony and Awards 7 Solar Decathlon Closing Ceremony and Awards 2007 Solar Decathlon Closing Ceremony and Awards October 19, 2007 - 3:21pm Addthis Remarks as Prepared for Secretary Bodman Thank you, Andy. I want to thank you once again for your leadership in making the Solar Decathlon such a success. The Solar Decathlon is now a permanent part of America. I also want to thank everyone sponsors, DOE employees, Members of Congress, any parents and faculty who might be with us and anyone else who came out this week in support of our decathletes. This has really been a remarkable event, one that has attracted crowds like we have not seen before. I've seen people from all over the country and from all walks of life down here on the Mall, keenly interested in the houses and the decathletes.

459

Solar Storm Closely Watched Worldwide | Department of Energy  

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

Storm Closely Watched Worldwide Storm Closely Watched Worldwide Solar Storm Closely Watched Worldwide March 9, 2012 - 10:14am Addthis While this week's solar storm captures the interest of scientists, researchers and people around the world, the Energy Department works with others to monitor the storm's potential impact on the nation's electrical grid. | Image credit: NOAA. While this week's solar storm captures the interest of scientists, researchers and people around the world, the Energy Department works with others to monitor the storm's potential impact on the nation's electrical grid. | Image credit: NOAA. Kenneth Friedman Senior Policy Advisor in the Office of Electricity Delivery and Energy Reliability The solar storm that is capturing the interest of scientists, researchers and people around the world is a geomagnetic disturbance from the sun.

460

Closing of the GNEP Ministerial Meeting | Department of Energy  

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

Closing of the GNEP Ministerial Meeting Closing of the GNEP Ministerial Meeting Closing of the GNEP Ministerial Meeting May 21, 2007 - 12:55pm Addthis Remarks as Prepared for Secretary Bodman Thank you all for coming. Ministers, distinguished guests, ladies and gentlemen of the press, thank you all for being here. I'm Sam Bodman, the United States Secretary of Energy. As I think most of you know, President Bush proposed a Global Nuclear Energy Partnership - or GNEP - to allow developing nations to share in the benefits of nuclear power in an environmentally sensitive way, consistent with our nonproliferation goals. And the most essential aspect of this endeavor, however we label it, is cooperation with partners to meet common goals. Today, the Ministers and Atomic Energy officials from Japan, France,

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

The Conjugate Linearized Ricci Flow on Closed 3-Manifolds  

E-Print Network [OSTI]

We characterize the conjugate linearized Ricci flow and the associated backward heat kernel on closed three--manifolds of bounded geometry. We discuss their properties, and introduce the notion of Ricci flow conjugated constraint sets which characterizes a way of Ricci flow averaging metric dependent geometrical data. We also provide an integral representation of the Ricci flow metric itself and of its Ricci tensor in terms of the heat kernel of the conjugate linearized Ricci flow. These results, which readily extend to closed n-dimensional manifolds, yield for various conservation laws, monotonicity and asymptotic formulas for the Ricci flow and its linearization.

Mauro Carfora

2007-10-17T23:59:59.000Z

462

Student Activities Student Activities  

E-Print Network [OSTI]

with Solar Energy? Activity B How do Atmospheres Produce their Effect Upon Surface Temperatures? Activity C and populations found in developing countries in Asia, Africa and Latin America. Figure 4.3 illustrates the actual

463

Rapid Evolution of -Glucuronidase Specificity by Saturation Mutagenesis of an Active Site Loop*  

E-Print Network [OSTI]

- lution as a design algorithm, but practitioners have not come to a consensus about the best method analysis of the 13 round 2 isolates sug- gested that all were products of intermolecular recom- bination (carboxylate for -glucuronides, hydrogen for -xylosid

Matsumura, Ichiro

464

Myoelectric activity of the cecum and proximal loop of the ascending colon in the cow  

E-Print Network [OSTI]

for their guidance and support. The team of Veterinary Medical park (Dr. Franklin J. Stein, Ms. Leslie A. Bird, Mrs. Libby A. Gaas, Mr. William J. Skrivanek, and Mr. Jim Nowakj for their excellent animal care and their help during surgeries. Mr. William Belz... compression rate of 20) Cluster of 22 spikes at electrode 3, each lasting between 4 and 24 sec (cow 5). . Page 50 51 52 INTRODUCTION Objectives Cecal dilatation/dislocation is a common abdominal disorder of high-producing dairy cattle. An atony...

Steiner, Adrian

2012-06-07T23:59:59.000Z

465

Adaptation of the Perception-Action Loop Using Active Channel Philippe Capdepuy1  

E-Print Network [OSTI]

in many cases. We also outline principles to adapt this mechanism to the exploration of multiple channels motivation, they have, structurally, little in common and it seems difficult to formulate a common principle fundamen- tal principles; even more interestingly, some of these principles are well established

Polani, Daniel

466

Complex domain interactions regulate stability and activity of closely related proneural transcription factors  

E-Print Network [OSTI]

.8. Multiple comparison testing Multiple comparison tests were carried out on the log2-trans- formed ratios of protein half-lives compared to wild type. Analysis was carried out with MATLAB#3; by one-way analysis of variance (ANOVA) followed by a multiple...

McDowell, Gary S.; Hardwick, Laura J.A.; Philpott, Anna

2014-07-03T23:59:59.000Z

467

E-Print Network 3.0 - activation induces close Sample Search...  

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

of Cell Biology, Yale University Collection: Biology and Medicine 78 RECENT ADVANCES IN SMART-MATERIAL ROTOR CONTROL ACTUATION. Victor Giurgiutiu*, Summary: and Astronautics,...

468

Analysis of closed-pool boilup using the TRANSIT-HYDRO code. [LMFBR  

SciTech Connect (OSTI)

The benign termination of the transition phase of a hypothetical LMFBR accident rests on the avoidance of highly energetic recriticalities prior to escape of bottled molten core materials from the active core region. In scenarios where molten fuel is trapped due to axial blockages, the maintenance of subcritical configurations until radial flow paths develop requires stable boil-up of the molten fuel/steel mixture. This paper describes the analysis of an experiment investigating the behavior of closed boiling pools using the two-fluid hydrodynamics module of TRANSIT-HYDRO, a deterministic transition-phase analysis code.

Graff, D.L.

1983-01-04T23:59:59.000Z

469

NON-CLOSED CURVES IN Rn WITH FINITE TOTAL FIRST  

E-Print Network [OSTI]

], and Kondo and Tanaka [14] have examined the global properties of the total curvature of a curveNON-CLOSED CURVES IN Rn WITH FINITE TOTAL FIRST CURVATURE ARISING FROM THE SOLUTIONS OF AN ODE P finite total first curvature. If all the roots of the associated characteristic polynomial are simple, we

Gilkey, Peter B

470

2014 SIBLING REBATE APPLICATION Closing Date: 31 March 2014  

E-Print Network [OSTI]

2014 SIBLING REBATE APPLICATION Closing Date: 31 March 2014 Please write CLEARLY and complete will be processed, considered and informed of the outcome of the application. The rebate applies only, bursaries, scholarships, sponsorship or the UCT Staff Tuition rate. Full details of the Rebate Policy

Jarrett, Thomas H.

471

96th LHCC meeting Agenda OPEN Session and CLOSED Session  

ScienceCinema (OSTI)

OPEN Session on Wednesday, 19 November 2008 at 9h00-11h00 in Main Auditorium, Live webcast. Followed by CLOSED Session , 6th floor Conference room and continued on Thursday, 20 November 2008 9h00-13h00

None

2011-10-06T23:59:59.000Z

472

Benefits and concerns of a closed nuclear fuel cycle  

SciTech Connect (OSTI)

Nuclear power can play an important role in our energy future, contributing to increasing electricity demand while at the same time decreasing carbon dioxide emissions. However, the nuclear fuel cycle in the United States today is unsustainable. As stated in the 1982 Nuclear Waste Policy Act, the U.S. Department of Energy is responsible for disposing of spent nuclear fuel generated by commercial nuclear power plants operating in a “once-through” fuel cycle in the deep geologic repository located at Yucca Mountain. However, unyielding political opposition to the site has hindered the commissioning process to the extant that the current administration has recently declared the unsuitability of the Yucca Mountain site. In light of this the DOE is exploring other options, including closing the fuel cycle through recycling and reprocessing of spent nuclear fuel. The possibility of closing the fuel cycle is receiving special attention because of its ability to minimize the final high level waste (HLW) package as well as recover additional energy value from the original fuel. The technology is, however, still very controversial because of the increased cost and proliferation risk it can present. To lend perspective on the closed fuel cycle alternative, this presents the arguments for and against closing the fuel cycle with respect to sustainability, proliferation risk, commercial viability, waste management, and energy security.

Widder, Sarah H.

2010-11-17T23:59:59.000Z

473

CHARM: An Efficient Algorithm for Closed Association Rule Mining  

E-Print Network [OSTI]

. It is also linearly scalable in the number of transactions and the number of closed itemsets found. 1) that frequently occur in many database records or transactions, and to extract the rules telling us how a subset is in market basket analysis, where the items represent products and the records the point­of­sales data

Bystroff, Chris

474

CHARM: An Efficient Algorithm for Closed Association Rule Mining  

E-Print Network [OSTI]

. It is also linearly scalable in the number of transactions and the number of closed itemsets found. 1) that frequently occur in many database records or transactions, and to extract the rules telling us how a subset is in market basket analysis, where the items represent products and the records the point-of-sales data

Bystroff, Chris

475

Error Analysis on ClosedForm Solutions for Kinematic Calibration  

E-Print Network [OSTI]

and even for designing a robot head or a robot arm when considering the calibration task. In this paper, we@iis.sinica.edu.tw #12; 2 Abstract Many closed­form solutions have been developed for calibrating robot kinematic method using 3D point measurements for calibrating robot kinematic parameters. Relatively less work has

Chen, Sheng-Wei

476

On the Complexity of Computing Generators of Closed Sets  

E-Print Network [OSTI]

On the Complexity of Computing Generators of Closed Sets Miki Hermann1 and Bari¸s Sertkaya2 1 LIX investigate the computational complexity of some deci- sion and counting problems related to generators the problem of checking the existence of a generator with a specified cardinality, and about the problem

Baader, Franz

477

A Note on Arbitrage and Closed Convex Cones Walter Schachermayer #  

E-Print Network [OSTI]

, P) = {0}. If C is closed (w.r. to the norm­topology in the case 1 # p r. to the weak of Dellacherie and Mokobodzki on the characterisation of semi­martingales. In 1990 C. Stricker ([St 90, Theorem 1

Schachermayer, Walter

478

Robust phase demodulation of interferograms with open or closed fringes  

E-Print Network [OSTI]

Investigacion en Matematicas A.C., Apdo. Postal 402, Guanajuato, Gto. Mexico 36000 mrivera@cimat.mx We present in the analysis of fringe patterns is the processing of closed fringe patterns. This problem has captured if the processed fringe pattern has a wide band, it is not normalized and it is corrupted by noise. In this paper

Rivera, Mariano

479

Thermodynamics and Relativity: Possible Consequences of their Close Link  

E-Print Network [OSTI]

The first part of this paper is a summary of a hypothesis previously advanced, suggesting the existence of a close link between thermodynamics and relativity. The second part is a preliminary comment about some possible consequences in the fields of physics, astronomy and biology.

Jean-Louis Tane

2008-05-25T23:59:59.000Z

480

WANTED: GIS Intern Close Date: 3/23/2012  

E-Print Network [OSTI]

WANTED: GIS Intern Close Date: 3/23/2012 Send Cover Letter, Resume, References, and Portfolio to: GIS.Intern@urbanrobotics.net Company Background Urban Robotics Inc. is a well-established engineering are currently hiring an Intern or entry level GIS Analyst capable of understanding the world of metadata

Escher, Christine

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.


481

Keep Your Enemies Close: Distance Bounding Against Smartcard Relay Attacks  

E-Print Network [OSTI]

Keep Your Enemies Close: Distance Bounding Against Smartcard Relay Attacks Saar Drimer and Steven J by an implementation of the relay attack that has been tested on live systems. Once designers appreciate the risk to the smartcard standard, based on a distance bounding protocol, which provides adequate resistance to the relay

Xu, Wenyuan

482

Analysis of Closed Multivessel Batch Distillation of Ternary Azeotropic Mixtures  

E-Print Network [OSTI]

Analysis of Closed Multivessel Batch Distillation of Ternary Azeotropic Mixtures using Elementary ­ Introducing the concept of elementary topological cells, we illustrate how vapor­liquid equilibrium (VLE with total reflux packed distillation column profiles when all resistance to mass transfer is in the vapor

Skogestad, Sigurd

483

Hybrid Combustion-Gasification Chemical Looping Coal Power Technology Development  

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

484

MULTIOBJECTIVE OPTIMIZATION POWER GENERATION SYSTEMS INVOLVING CHEMICAL LOOPING COMBUSTION  

SciTech Connect (OSTI)

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

485

Laser Safety Method For Duplex Open Loop Parallel Optical Link  

DOE Patents [OSTI]

A method and apparatus are provided to ensure that laser optical power does not exceed a "safe" level in an open loop parallel optical link in the event that a fiber optic ribbon cable is broken or otherwise severed. A duplex parallel optical link includes a transmitter and receiver pair and a fiber optic ribbon that includes a designated number of channels that cannot be split. The duplex transceiver includes a corresponding transmitter and receiver that are physically attached to each other and cannot be detached therefrom, so as to ensure safe, laser optical power in the event that the fiber optic ribbon cable is broken or severed. Safe optical power is ensured by redundant current and voltage safety checks.

Baumgartner, Steven John (Zumbro Falls, MN); Hedin, Daniel Scott (Rochester, MN); Paschal, Matthew James (Rochester, MN)

2003-12-02T23:59:59.000Z

486

LORENTZ SELF-FORCE OF AN ELLIPSE CURRENT LOOP MODEL  

SciTech Connect (OSTI)

In this work, the Lorentz self-force of an ellipse current loop model is derived. We are motivated by the fact that it has been reported in the literature that coronal mass ejection morphology can resemble an ellipse in the field of view of coronagraph images. Deriving the Lorentz self-force using an ellipse geometry has the advantage of being able to be solved analytically, as opposed to other more complex geometries. The derived ellipse model is compared with the local curvature approximation, where the Lorentz self-force at the ellipse major/minor axis is compared with the Lorentz self-force of a torus with curvature equal to the local curvature at the ellipses major/minor axis. It is found that the local curvature approximation is valid for moderate values of eccentricity.

Olmedo, Oscar [Space Sciences Division, Naval Research Laboratory, Washington, DC 20375 (United States); Zhang Jie; Kunkel, Valbona, E-mail: oscar.olmedo.ctr@nrl.navy.mil [School of Physics, Astronomy and Computational Sciences, George Mason University, 4400 University Drive, Fairfax, VA 22030 (United States)

2013-07-10T23:59:59.000Z

487

NLO evolution of 3-quark Wilson loop operator  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

It is well known that high-energy scattering of a meson from some hadronic target can be described by the interaction of that target with a color dipole formed by two Wilson lines corresponding to fast quark-antiquark pair. Moreover, the energy dependence of the scattering amplitude is governed by the evolution equation of this color dipole with respect to rapidity. Similarly, the energy dependence of scattering of a baryon can be described in terms of evolution of a three-Wilson-lines operator with respect to the rapidity of the Wilson lines. We calculate the evolution of the 3-quark Wilson loop operator in the next-to-leading order (NLO) and present a quasi-conformal evolution equation for a composite 3-Wilson-lines operator. We also obtain the linearized version of that evolution equation describing the amplitude of the odderon exchange at high energies.

Balitsky, Ian [ODU, JLAB; Grabovsky, A V [Novosibirsk

2015-01-01T23:59:59.000Z

488

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 for temperatures in the range 150MeVmodels. For temperatures below 150MeV different lattice results disagree. One set of data can be described if exotic hadrons are present in the QCD spectrum while other sets do not require such states.

E. Megias; E. Ruiz Arriola; L. L. Salcedo

2012-04-11T23:59:59.000Z

489

Asymmetric Magnetization Reversal in Exchange-Biased Hysteresis Loops  

SciTech Connect (OSTI)

Polarized neutron reflectometry is used to probe the in-plane projection of the net-magnetization vector M(vector sign) of polycrystalline Fe films exchange coupled to twinned (110) MnF{sub 2} or FeF{sub 2} antiferromagnetic (AF) layers. The magnetization reversal mechanism depends upon the orientation of the cooling field with respect to the twinned microstructure of the AF, and whether the applied field is increased to (or decreased from) a positive saturating field; i.e., the magnetization reversal is asymmetric. The reversal of the sample magnetization from one saturated state to the other occurs via either domain wall motion or magnetization rotation on opposite sides of the same hysteresis loop. (c) 2000 The American Physical Society.

Fitzsimmons, M. R.; Yashar, P.; Leighton, C.; Schuller, Ivan K.; Nogues, J.; Majkrzak, C. F.; Dura, J. A.

2000-04-24T23:59:59.000Z

490

Dry dilution refrigerator with He-4 precool loop  

SciTech Connect (OSTI)

He-3/He-4 dilution refrigerators (DR) are very common in sub-Kelvin temperature research. We describe a pulse tube precooled DR where a separate He-4 circuit condenses the He-3 of the dilution loop. Whereas in our previous work the dilution circuit and the He-4 circuit were separate, we show how the two circuits can be combined. Originally, the He-4 loop with a base temperature of ? 1 K was installed to make an additional cooling power of up to 100 mW available to cool cold amplifiers and electrical lines. In the new design, the dilution circuit is run through a heat exchanger in the vessel of the He-4 circuit so condensation of the He-3 stream of the DR is done by the He-4 stage. A much reduced condensation time (factor of 2) of the He-3/He-4 gas mixture at the beginning of an experiment is achieved. A compressor is no longer needed with the DR as the condensation pressure remains below atmospheric pressure at all times; thus the risk of losing expensive He-3 gas is small. The performance of the DR has been improved compared to previous work: The base temperature of the mixing chamber at a small He-3 flow rate is now 4.1 mK; at the highest He-3 flow rate of 1.2 mmol/s this temperature increases to 13 mK. Mixing chamber temperatures were measured with a cerium magnesium nitrate (CMN) thermometer which was calibrated with a superconducting fixed point device.

Uhlig, Kurt [Walther-Meissner-Institute, 85748 Garching (Germany)

2014-01-29T23:59:59.000Z

491

Open-loop control of noise amplification in a separated boundary layer flow  

SciTech Connect (OSTI)

Linear optimal gains are computed for the subcritical two-dimensional separated boundary-layer flow past a bump. Very large optimal gain values are found, making it possible for small-amplitude noise to be strongly amplified and to destabilize the flow. The optimal forcing is located close to the summit of the bump, while the optimal response is the largest in the shear layer. The largest amplification occurs at frequencies corresponding to eigenvalues which first become unstable at higher Reynolds number. Nonlinear direct numerical simulations show that a low level of noise is indeed sufficient to trigger random flow unsteadiness, characterized here by large-scale vortex shedding. Next, a variational technique is used to compute efficiently the sensitivity of optimal gains to steady control (through source of momentum in the flow, or blowing/suction at the wall). A systematic analysis at several frequencies identifies the bump summit as the most sensitive region for control with wall actuation. Based on these results, a simple open-loop control strategy is designed, with steady wall suction at the bump summit. Linear calculations on controlled base flows confirm that optimal gains can be drastically reduced at all frequencies. Nonlinear direct numerical simulations also show that this control allows the flow to withstand a higher level of stochastic noise without becoming nonlinearly unstable, thereby postponing bypass transition. In the supercritical regime, sensitivity analysis of eigenvalues supports the choice of this control design. Full restabilization of the flow is obtained, as evidenced by direct numerical simulations and linear stability analysis.

Boujo, E., E-mail: edouard.boujo@epfl.ch; Gallaire, F., E-mail: francois.gallaire@epfl.ch [Laboratory of Fluid Mechanics and Instabilities, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne (Switzerland); Ehrenstein, U., E-mail: ehrenstein@irphe.univ-mrs.fr [Aix Marseille Université, CNRS, Centrale Marseille, IRPHE UMR 7342, F-13384 Marseille (France)

2013-12-15T23:59:59.000Z

492

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

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

493

Buckling of a soap film spanning a flexible loop resistant to bending and twisting  

Science Journals Connector (OSTI)

...a soap film spanning a flexible loop resistant to bending and twisting Aisa Biria 1 Eliot Fried 2...A generalization of the Euler-Plateau problem to account for the energy contribution due to twisting of the bounding loop is proposed. Euler-Lagrange...

2014-01-01T23:59:59.000Z

494

SEQUENTIAL OPEN-LOOP SCHEDULING STRATEGIES P. Nash, R.R. Weber  

E-Print Network [OSTI]

-optimal, scheduling strategies. This new approach is based on the notion of sequential open-loop control, sometimesSEQUENTIAL OPEN-LOOP SCHEDULING STRATEGIES P. Nash, R.R. Weber Cambridge University ABSTRACT For certain scheduling problems wi th pre-emptive processing, a dynamic programming formulation reduces

Weber, Richard

495

The latency insertion method for simulations of phase-locked loops  

Science Journals Connector (OSTI)

In this paper, we present two methods for the simulations of phase-locked loops (PLL) based on the latency insertion method (LIM). First, we present a novel and simple behavioral model based simulation method that exploits the latency in the PLL formulation ... Keywords: Latency insertion method (LIM), Phase-locked loop (PLL), Simulation

P. Goh, J. E. Schutt-Ainé

2014-06-01T23:59:59.000Z

496

On the Location of Energy Release and Temperature Pro les along Coronal Loops  

E-Print Network [OSTI]

temperature and the temperature distribution along the loop. In each case the ratio between the heat deposited and radiation provides a scaling for the summit temperature. Keywords: methods: Numerical - MHD - sun: corona;les of the energy release are then used to in- vestigate the temperature distribution along a loop.

Mackay, Duncan

497

Multi-strand coronal loop model and filter-ratio analysis  

E-Print Network [OSTI]

We model a coronal loop as a bundle of seven separate strands or filaments. Each of the loop strands used in this model can independently be heated (near their left footpoints) by Alfv\\'en/ion-cyclotron waves via wave-particle interactions. The Alfv\\'en waves are assumed to penetrate the strands from their footpoints, at which we consider different wave energy inputs. As a result, the loop strands can have different heating profiles, and the differential heating can lead to a varying cross-field temperature in the total coronal loop. The simulation of TRACE observations by means of this loop model implies two uniform temperatures along the loop length, one inferred from the 171:195 filter ratio and the other from the 171:284 ratio. The reproduced flat temperature profiles are consistent with those inferred from the observed EUV coronal loops. According to our model, the flat temperature profile is a consequence of the coronal loop consisting of filaments, which have different temperatures but almost similar e...

Bourouaine, S

2009-01-01T23:59:59.000Z

498

THERMAL NON-EQUILIBRIUM REVISITED: A HEATING MODEL FOR CORONAL LOOPS  

SciTech Connect (OSTI)

The location and frequency of events that heat the million-degree corona are still a matter of debate. One potential heating scenario is that the energy release is effectively steady and highly localized at the footpoints of coronal structures. Such an energy deposition drives thermal non-equilibrium solutions in the hydrodynamic equations in longer loops. This heating scenario was considered and discarded by Klimchuk et al. on the basis of their one-dimensional simulations as incapable of reproducing observational characteristics of loops. In this paper, we use three-dimensional simulations to generate synthetic emission images, from which we select and analyze six loops. The main differences between our model and that of Klimchuk et al. concern (1) dimensionality, (2) resolution, (3) geometrical properties of the loops, (4) heating function, and (5) radiative function. We find evidence, in this small set of simulated loops, that the evolution of the light curves, the variation of temperature along the loops, the density profile, and the absence of small-scale structures are compatible with the characteristics of observed loops. We conclude that quasi-steady footpoint heating that drives thermal non-equilibrium solutions cannot yet be ruled out as a viable heating scenario for EUV loops.

Lionello, Roberto; Linker, Jon A.; Mikic, Zoran [Predictive Science, Inc., 9990 Mesa Rim Rd., Ste. 170, San Diego, CA 92121-2910 (United States); Winebarger, Amy R. [NASA Marshall Space Flight Center, ZP 13, Huntsville, AL 35812 (United States); Mok, Yung, E-mail: lionel@predsci.com, E-mail: linkerj@predsci.com, E-mail: mikicz@predsci.com, E-mail: amy.r.winebarger@nasa.gov, E-mail: ymok@uci.edu [Department of Physics and Astronomy, University of California, 4129 Reines Hall, Irvine, CA 92697 (United States)

2013-08-20T23:59:59.000Z

499

Investigation of a Coupled Fuel Reactor for Coal-Fueled Chemical Looping Combustion  

Science Journals Connector (OSTI)

To determine the solids circulation rate, an annular loop-seal was designed. ... Shen, L.; Wu, J.; Xiao, J.Experiments on chemical looping combustion of coal with a NiO based oxygen carrier Combust. ... Industrial & Engineering Chemistry Research (2013), 52 (18), 6119-6128 CODEN: IECRED; ISSN:0888-5885. ...

Hongming Sun; Lei Xu; Zhenshan Li; Ningsheng Cai

2014-09-02T23:59:59.000Z

500

Chemical-Looping Combustion with Fuel Oil in a 10 kW Pilot Plant  

Science Journals Connector (OSTI)

Chemical-Looping Combustion with Fuel Oil in a 10 kW Pilot Plant ... The unit is based on interconnected fluidized beds and is similar to the design originally presented by Lyngfelt et al.(12) In the riser section there is a fast-fluidized regime, whereas in the loop-seals and the fuel reactor there is a bubbling regime. ... Energy Combust. ...

Patrick Moldenhauer; Magnus Rydén; Tobias Mattisson; Ali Hoteit; Aqil Jamal; Anders Lyngfelt

2014-08-29T23:59:59.000Z