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Note: This page contains sample records for the topic "dual overhead cam" from the National Library of EnergyBeta (NLEBeta).
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1

Self-latching eccentric cam for dual stroke compressor or pump  

DOE Patents (OSTI)

For a dual capacity refrigerant compressor of the type which has an eccentric cam rotatable on a crankpin between two opposite positions which changes the total eccentricity of the crankpin and cam so as to obtain two different stroke lengths, the rotation of the cam on the crankpin being effected by a reversal of motor operation, the cam moves through an angle of about 270.degree. around the crankpin so that a centrifugal force torque tending to hold the cam in place is available at least in the reduced stroke length position of the cam, and by providing lightening cavities and eccentric weightings, the center of mass 74 of the cam can be shifted to obtain the centrifugal torque in the proper direction at both the maximum and reduced stroke positions.

Sisk, Francis J. (San Mateo, CA)

1985-01-01T23:59:59.000Z

2

SMB Host Processor Overhead  

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

SMB SMB SMB Description There are two benchmarks included here. The msg_rate test measures the sustained MPI message rate using a communication pattern found in many real applications. For a complete explanation of the routine refer to http://www.cs.sandia.gov/smb/msgrate.html. The mpi_overhead test uses a post-work-wait method using MPI non-blocking send and receive calls to measure the user level overhead of the respective MPI calls. For a complete explanation of the routine refer to http://www.cs.sandia.gov/smb/overhead.html. Download SMB tar file How to Build The source files are in the src directory, in smb_1.0-1/src/mpi_overhead and smb_1.0-1/src/msgrate. Edit the Makefile for your environment and type 'make.' How to Run The executables run a single message at a time. The "run_script" scripts

3

CAMS Center for Accelerator Mass Spectrometry  

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

research Lichen research Dinosaur bone research Biology Earth Science About CAMS Tour CAMS History of CAMS Meet the CAMS Staff CAMS Publications CAMS Home Seminars Download...

4

Method for decreasing arbitration overhead  

SciTech Connect

This invention is a method for decreasing the arbitration overhead required to transfer messages on a shared multiprocessor bus.

Bergey, A.L. Jr.; Coale, J.L.

1983-12-01T23:59:59.000Z

5

Overhead Distribution Vegetation Challenges  

Science Conference Proceedings (OSTI)

It is not uncommon for overhead distribution conductors to make contact with trees. While these incidental contacts can be either intermittent or relatively persistent, they are typically not detectable by overcurrent protection systems and do not result in interruptions on distribution circuits. This report focuses on the levels of fault currents and voltage gradients found along the fault pathway provided by trees from point of contact to earth. The purpose of this investigation was to measure the volt...

2008-12-18T23:59:59.000Z

6

HVDC Overhead Transmission Guide  

Science Conference Proceedings (OSTI)

This report is the initial version of a new EPRI publication, the HVDC Overhead Line Design Guide. The main objective of the report is to present a proposed outline for the guide so that users can review and discuss the content. The outline will then be fine-tuned with users to meet their needs. Topics unique to high-voltage direct current (HVDC) systems have been identified and included in the outline. The topics will be addressed and design information added each year. The ultimate goal ...

2012-12-12T23:59:59.000Z

7

DER-CAM  

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

DER-CAM The Distributed Energy Resources Customer Adoption Model (DER-CAM) is a techno-economic model of customer DER adoption. Users input market information (fuel prices), system...

8

Overhead Line Worker Practices Survey: 2012  

Science Conference Proceedings (OSTI)

The Electric Power Research Institute (EPRI) has undertaken a multiyear research project to identify and describe leading industry overhead line worker practices. This effort is intended to identify and document industry overhead distribution line work practices of note, identify shortterm products (such as practices guidelines) that EPRI can ...

2012-08-23T23:59:59.000Z

9

Roller Cam Positioners  

Science Conference Proceedings (OSTI)

Roller Cam Positioners could support the LCLS undulator sections allowing micron sized alignment adjustment of each undulator in 5 degrees of freedom. The supports are kinematic with the number of degrees of freedom matched to the number of constraints. Ton loads are supported on simple ball bearings. Motion is intrinsically bounded. Positioning mechanisms are based on pure rolling motion with sub-micron hysteresis and micron resolution. This note describes a general purpose positioning mechanism suitable for undulator support.

Bowden, Gordon B.

2010-12-07T23:59:59.000Z

10

Overhead Lineworker Practices: Lincoln Electric System  

Science Conference Proceedings (OSTI)

This report describes the findings of an overhead distribution line worker practices immersion conducted by the Electric Power Research Institute (EPRI) with the Lincoln Electric System (LES). The immersion was conducted as part of a multiyear effort by EPRI to identify noteworthy line worker practices related to the management of overhead distribution systems. More specifically, this report profiles the practices (the people, processes, and technology) in place at LES, a Lincoln, Nebraskabased utility. ...

2011-12-21T23:59:59.000Z

11

Path specialization: reducing phased execution overheads  

Science Conference Proceedings (OSTI)

As garbage collected languages become widely used, the quest for reducing collection overheads becomes essential. In this paper, we propose a compiler optimization called path specialization that shrinks the cost of memory barriers for a wide ... Keywords: c#, garbage collection, memory management, read barriers, write barriers

Filip Pizlo; Erez Petrank; Bjarne Steensgaard

2008-06-01T23:59:59.000Z

12

Reducing memory sharing overheads in distributed JVMs  

Science Conference Proceedings (OSTI)

Distributed JVM systems by supporting Java’s shared-memory model enable concurrent Java applications to run transparently on clusters of computers. Aiming to reduce the overheads associated to memory coherence enforcement mechanisms required in ... Keywords: JVM, Java, cluster computing, concurrent Java applications, distributed shared memory, high-performance computing

Marcelo Lobosco; Orlando Loques; Claudio L. de Amorim

2005-09-01T23:59:59.000Z

13

Cam-controlled boring bar  

DOE Patents (OSTI)

A cam-controlled boring bar system (100) includes a first housing (152) which is rotatable about its longitudinal axis (154), and a second housing in the form of a cam-controlled slide (158) which is also rotatable about the axis (154) as well as being translatable therealong. A tool-holder (180) is mounted within the slide (158) for holding a single point cutting tool. Slide (158) has a rectangular configuration and is disposed within a rectangularly configured portion of the first housing (152). Arcuate cam slots (192) are defined within a side plate (172) of the housing (152), while cam followers (194) are mounted upon the cam slide (158) for cooperative engagement with the cam slots (192). In this manner, as the housing (152) and slide (158) rotate, and as the slide (158) also translates, a through-bore (14) having an hourglass configuration will be formed within a workpiece (16) which may be, for example, a nuclear reactor steam generator tube support plate.

Glatthorn, Raymond H. (St. Petersburg, FL)

1986-01-01T23:59:59.000Z

14

Overhead Transmission Inspection and Assessment Guidelines -- 2011  

Science Conference Proceedings (OSTI)

The emphasis within the transmission arena has shifted from designing and building new transmission facilities to optimizing the use, performance, and life of existing facilities. In the early 1990s, EPRI established an initiative to examine the capabilities and limitations of existing inspection and assessment methods and technology. One of the key needs identified was information on methods and technologies for inspecting/assessing the conditions and life expectancy of overhead transmission line compon...

2011-12-23T23:59:59.000Z

15

Overhead Transmission Line Inspector Workshop Proceedings - 2012  

Science Conference Proceedings (OSTI)

 This report presents the proceedings of the Electric Power Research Institute (EPRI) Overhead Transmission Line Inspector Workshop, which was held Monday, July 30, through Wednesday, August 1, 2012, at the Hyatt Place Hotel and at Georgia Power’s Klondike Training Center in Lithonia, Georgia.The first half day of the workshop focused on inspection and assessment, with a participant roundtable discussion, followed by utility, vendor and EPRI presentations on the ...

2012-11-14T23:59:59.000Z

16

Overhead Transmission Inspection and Assessment Guidelines - 2012  

Science Conference Proceedings (OSTI)

The emphasis within the transmission arena has shifted from designing and building new transmission facilities to optimizing the use, performance, and life of existing facilities. In the early 1990s, EPRI established an initiative to examine the capabilities and limitations of existing inspection and assessment methods and technology. One of the key needs identified was information on methods and technologies for inspecting/assessing the conditions and life expectancy of overhead transmission line ...

2012-12-20T23:59:59.000Z

17

Optimal Design of Overhead Distribution Systems  

Science Conference Proceedings (OSTI)

It is not uncommon for overhead distribution conductors to make contact with trees. These incidental contacts can be either intermittent or relatively persistent, are typically not detectable by overcurrent protection systems, and typically do not result in interruptions on distributions circuits. This project focuses on assessing voltage gradients and fault currents created when trees come into contact with distribution conductors, allowing current to flow through the tree from point of contact to earth...

2007-12-19T23:59:59.000Z

18

Sizing of Overhead Ground Wires for Lightning  

Science Conference Proceedings (OSTI)

Overhead ground wires, or shield wires, are placed on transmission lines as air terminals for lightning strikes to shield the phase conductors from direct strikes. Although of short duration, lightning strikes to ground wires may result in significant damage. Utilities are increasingly using optical fiber ground wires (OPGWs), and severe damage to the OPGWs could result in failure of the communication link. There is renewed interest in the dimensioning and testing of ground wires for improved ...

2012-12-12T23:59:59.000Z

19

Bimetallic steel/aluminum wire for overhead telecommunication lines  

Science Conference Proceedings (OSTI)

for power transmission and overhead telecommunication lines and other .... " Method of manufacture of bimetallic wire for, e.g., trolley-bus cable or rods, n Inven-.

20

Overhead elimination mechanisms in real-time systems  

Science Conference Proceedings (OSTI)

The OEM (Overhead Elimination Mechanism), a scheduler for finding minimal overheads with reduced context switches in real-time systems, was developed using procedural methods. Software produced by these methods has often proven to be inflexible and difficult ... Keywords: Real-time scheduling, context switches, object-oriented, procedural, rate monotonic algorithm

Ilhyun Lee; Haesun K. Lee; Narayan Debnath

2006-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "dual overhead cam" 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

Compliance Assurance Monitoring (CAM) Implementation Study  

Science Conference Proceedings (OSTI)

Many power producers are required to include a Compliance Assurance Monitoring (CAM) Plan in their first Title V permit renewal application. In developing the CAM plan, sources must provide a reasonable assurance of compliance with the applicable emission limit(s) for each affected unit. Currently, only particulate mass emissions are of concern to power producers. Therefore, CAM plans must be based on measurable parameters that can be related to particulate emissions in a reliable manner. Since the regul...

2003-10-16T23:59:59.000Z

22

Hazmat Cam Wireless Video System  

SciTech Connect

This paper describes the Hazmat Cam Wireless Video System and its application to emergency response involving chemical, biological or radiological contamination. The Idaho National Laboratory designed the Hazmat Cam Wireless Video System to assist the National Guard Weapons of Mass Destruction - Civil Support Teams during their mission of emergency response to incidents involving weapons of mass destruction. The lightweight, handheld camera transmits encrypted, real-time video from inside a contaminated area, or hot-zone, to a command post located a safe distance away. The system includes a small wireless video camera, a true-diversity receiver, viewing console, and an optional extension link that allows the command post to be placed up to five miles from danger. It can be fully deployed by one person in a standalone configuration in less than 10 minutes. The complete system is battery powered. Each rechargeable camera battery powers the camera for 3 hours with the receiver and video monitor battery lasting 22 hours on a single charge. The camera transmits encrypted, low frequency analog video signals to a true-diversity receiver with three antennas. This unique combination of encryption and transmission technologies delivers encrypted, interference-free images to the command post under conditions where other wireless systems fail. The lightweight camera is completely waterproof for quick and easy decontamination after use. The Hazmat Cam Wireless Video System is currently being used by several National Guard Teams, the US Army, and by fire fighters. The system has been proven to greatly enhance situational awareness during the crucial, initial phase of a hazardous response allowing commanders to make better, faster, safer decisions.

Kevin L. Young

2006-02-01T23:59:59.000Z

23

Guide for Selection of Overhead Line Components and Design Parameters  

Science Conference Proceedings (OSTI)

This report outlines the contents for the Electric Power Research Institute (EPRI) report Guide for Selection of Overhead Line Components and Design Parameters that is to be developed under the Design and Construction—Approach and Practice project. It identifies the topics to be covered and the scope to be developed for each topic. New topics will be added to the list whenever such needs arise. Detailed information suitable for use in the design of overhead lines on a few topics will be ...

2012-12-31T23:59:59.000Z

24

Emerging and Future Inspection of Overhead Transmission Lines  

Science Conference Proceedings (OSTI)

This technical update report describes research by the Electric Power Research Institute (EPRI) into emerging and future overhead electric transmission line inspection and assessment technologies. In 2008, EPRI published a report entitled Future Inspection of Overhead Transmission Lines (product 1016921) that documented scenarios and viable technologies that could be applied for the inspection of transmission lines over a multi-decade timeframe. That document was intended to provide a roadmap for near- a...

2011-12-22T23:59:59.000Z

25

Model Documentation for the MiniCAM  

SciTech Connect

The MiniCAM, short for the Mini-Climate Assessment Model, is an integrated assessment model of moderate complexity focused on energy and agriculture sectors. The model produces emissions of greenhouse gases (carbon dioxide, methane and nitrous oxide) and other radiatively important substances such as sulfur dioxide. Through incorporation of the simple climate model MAGICC, the consequences of these emissions for climate change and sea-level rise can be examined. The MiniCAM is designed to be fast and flexible.

Brenkert, Antoinette L.; Smith, Steven J.; Kim, Son H.; Pitcher, Hugh M.

2003-07-17T23:59:59.000Z

26

DOE-HDBK-1141-2001; Radiological Assessor Training, Overheads  

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

13.1 13.1 Overhead 13.1 DOE-HDBK-1141-2001 Radiological Aspects of Accelerators Objectives: * Identify the general characteristics of accelerators. * Identify the types of particles accelerated. * Identify the two basic types of accelerators. * Identify uses for accelerators. * Define prompt radiation. * Identify prompt radiation sources. OT 13.2 Overhead 13.2 DOE-HDBK-1141-2001 Radiological Aspects of Accelerators (cont.) Objectives: * Define radioactivation. * Explain how contaminated material differs from activated material with regard to radiological concerns. * Identify activation sources. OT 13.3 Overhead 13.3 DOE-HDBK-1141-2001 Radiological Aspects of Accelerators (cont.) Objectives: * Identify engineered and administrative controls at accelerator facilities. * Identify the special

27

Nondestructive Testing of Overhead Transmission Lines: Numerical and Experimental Investigation  

E-Print Network (OSTI)

Overhead transmission lines are periodically inspected using both on-ground and helicopter-aided visual inspection. Factors including sun glare, cloud cover, close proximity to power lines and the rapidly changing visual circumstances make airborne inspection of power lines a particularly hazardous task. In this research, a finite element model is developed that can be used to create the theoretical dispersion curves of an overhead transmission line. The complex geometry of the overhead transmission line is the primary reason for absence of a theoretical solution to get the analytical dispersion curves. The numerical results are then verified with experimental tests using a non-contact and broadband laser detection technique. The methodology developed in this study can be further extended to a continuous monitoring system and be applied to other cable monitoring applications, such as bridge cable monitoring, which would otherwise put human inspectors at risk.

Kulkarni, Salil Subhash

2009-12-01T23:59:59.000Z

28

Overhead Line Loading Program (OHLOAD) Version 2.0  

Science Conference Proceedings (OSTI)

OHLOAD allows the user to calculate thermal ratings and conductor temperatures for overhead power transmission lines. EPRI's Overhead Line Loading Program (OHLOAD 2.0) calculates bare conductor temperatures and thermal ratings based on user-specified weather parameters and user-specified electrical load. The calculation methods available in OHLOAD are based on various CIGRE, IEEE, and EPRI documents. WindowsXP, Vista, and Windows 7. The PC must have at least 20 MB of free disk space and a Pentium II proc...

2012-05-01T23:59:59.000Z

29

Overhead Transmission Line Lightning and Grounding Reference Book 2012  

Science Conference Proceedings (OSTI)

In North America and many other parts of the world, lightning remains the primary cause of transmission line outages, momentary interruptions, and reliability and maintenance problems. The lightning performance of transmission lines may be improved by applying overhead ground wires, providing a low impedance connection to ground, and selecting appropriate insulation levels for the phase conductors. The success of these measures is not always ...

2012-12-12T23:59:59.000Z

30

The Importance of Non-Data-Communication Overheads in MPI  

Science Conference Proceedings (OSTI)

With processor speeds no longer doubling every 18â??24 months owing to the exponential increase in power consumption and heat dissipation, modern high-end computing systems tend to rely less on the performance of single processing units and instead ... Keywords: Blue Gene/P, MPI, non-data-communication overheads

Pavan Balaji; Anthony Chan; William Gropp; Rajeev Thakur; Ewing Lusk

2010-02-01T23:59:59.000Z

31

Overhead reduction in a distributed path management system  

Science Conference Proceedings (OSTI)

CEAS (cross entropy ant system) is a distributed, robust and adaptive swarm intelligence system for path management in communication networks. This paper focuses on strategies for handling the overhead in terms of processing cycles, memory storage, and ... Keywords: Cross entropy, Path management, Swarm intelligence

Poul E. Heegaard; Otto J. Wittner

2010-04-01T23:59:59.000Z

32

An Approach for Reduction of the Security Overhead in Smart Grid Communication Infrastructure Employing Dedicated Encryption  

E-Print Network (OSTI)

An Approach for Reduction of the Security Overhead in Smart Grid Communication Infrastructure for data secu- rity within the Smart Grid communications infrastructure. A significant part communication channels. Keywords--Smart Grid; information-communication infras- tructure; overheads; data

Kavcic, Aleksandar

33

Overhead Transmission Line Inspection - Online Training (OTLOT) Version 9.0  

Science Conference Proceedings (OSTI)

The EPRI Overhead Transmission Line Inspection - Online Training is a CD-based application for training on how to complete overhead transmission line inspections.It contains fourteen modules of instruction on overhead transmission line inspections. A browser interface helps the user navigate through the interactive training. As the user moves through the module, it provides instruction, application practice, and review questions.Benefits & ...

2013-12-16T23:59:59.000Z

34

Bounding Communication Energy Overhead in Parallel Networks with Power-Delay Scalability  

Science Conference Proceedings (OSTI)

We propose the energy scalability and power-delay product scalability as new metrics for calculating and estimating boundaries on the energy overhead of parallel processing systems. Because both properties consider network topology and the algorithm ... Keywords: energy overhead, communication overhead, energy scalability, power-delay scalability

James S. Tandon; Steven E. Butner

2008-12-01T23:59:59.000Z

35

PRE-SW EPRI Overhead Transmission Line Inspection - Online Training (OTLOT) Version 9.0, Beta  

Science Conference Proceedings (OSTI)

The EPRI Overhead Transmission Line Inspection - Online Training is a CD-based application for training on how to complete overhead transmission line inspections.It contains fourteen modules of instruction on overhead transmission line inspections. A browser interface helps the user navigate through the interactive training. As the user moves through the module, it provides instruction, application practice, and review questions.    Benefits ...

2013-08-25T23:59:59.000Z

36

CLOMP: Accurately Characterizing OpenMP Application Overheads  

SciTech Connect

Despite its ease of use, OpenMP has failed to gain widespread use on large scale systems, largely due to its failure to deliver sufficient performance. Our experience indicates that the cost of initiating OpenMP regions is simply too high for the desired OpenMP usage scenario of many applications. In this paper, we introduce CLOMP, a new benchmark to characterize this aspect of OpenMP implementations accurately. CLOMP complements the existing EPCC benchmark suite to provide simple, easy to understand measurements of OpenMP overheads in the context of application usage scenarios. Our results for several OpenMP implementations demonstrate that CLOMP identifies the amount of work required to compensate for the overheads observed with EPCC. Further, we show that CLOMP also captures limitations for OpenMP parallelization on NUMA systems.

Bronevetsky, G; Gyllenhaal, J; de Supinski, B

2008-02-11T23:59:59.000Z

37

Guide for High Temperature Operation of Overhead Lines: 2012 Updates  

Science Conference Proceedings (OSTI)

This Guide assists users in raising the capacities of overhead transmission lines by increasing the conductor temperature. It is based on a wealth of knowledge accumulated from extensive research conducted internally at the Electric Power Research Institute (EPRI), information from manufacturers, and results from research conducted outside of EPRI. The Guide has evolved from a collection of numerous EPRI reports published in the past, including Effect of High-Temperature Cycling on Conductor ...

2012-12-12T23:59:59.000Z

38

HVDC Overhead Line Design Guide: 2013 Interim Report  

Science Conference Proceedings (OSTI)

This report is an updated version of the Electric Power Research Institute (EPRI) report HVDC Overhead Line Design Guide (1024326). An outline developed in 2012 identified all of the topics to be covered by the report. A draft for high-voltage, direct-current (HVDC) ground electrodes and another for HVDC conductor selection were also included in the 2012 version. These topics were finalized in 2013, and the topics of HVDC line performance and insulation were added to the report. All four ...

2013-12-23T23:59:59.000Z

39

Thermal Models of Overhead Transmission Lines Operating at High Temperatures  

Science Conference Proceedings (OSTI)

Bare stranded overhead transmission line conductorsreferred to as aluminum conductor steel reinforced ACSRtypically consist of at least two layers of aluminum strands, helically stranded around a core consisting of steel wires. The current that flows through such conductors is located predominantly in the aluminum layers while the steel core provides mechanical strength and limits sag at high temperature. The lack of new line construction combined with the decoupling of transmission from power generatio...

2010-12-23T23:59:59.000Z

40

Parameters that Influence the Aging and Degradation of Overhead Conductors  

Science Conference Proceedings (OSTI)

EPRI has been investigating degradation mechanisms, inspection methods, and condition assessment methods for overhead line conductors for a few years. This report identifies conductor failure modes and discusses the associated degradation mechanisms. It further discusses methods of inspection and assessment that may be used to establish the current condition of conductors. Finally, it discusses how this data can be used to develop end-of-life criteria and estimate remaining useful life for conductors.

2003-12-22T23:59:59.000Z

Note: This page contains sample records for the topic "dual overhead cam" 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

Guide for Operating Overhead Lines at High Temperatures  

Science Conference Proceedings (OSTI)

This Guide assists users in raising the capacities of overhead transmission lines by increasing the conductor temperature. It is based on a wealth of knowledge accumulated from extensive research conducted internally at the Electric Power Research Institute (EPRI), information from manufacturers, and results from research conducted outside of EPRI. The Guide evolved from a collection of numerous EPRI reports published in the past, for example, Effect of High-Temperature Cycling on Conductor Systems (EPRI...

2010-12-13T23:59:59.000Z

42

CAM/LIFTER forces and friction  

DOE Green Energy (OSTI)

This report details the procedures used to measure the cam/lifter forces and friction. The present effort employed a Cummins LTA-10, and focuses on measurements and dynamic modeling of the injector train. The program was sponsored by the US Department of Energy in support of advanced diesel engine technology. The injector train was instrumented to record the instantaneous roller speed, roller pin friction torque, pushrod force, injector link force and cam speed. These measurements, together with lift profiles for pushrod and injector link displacement, enabled the friction work loss in the injector train to be determined. Other significant design criteria such as camshaft roller follower slippage and maximum loads on components were also determined. Future efforts will concentrate on the dynamic model, with tests run as required for correlation.

Gabbey, D.J.; Lee, J.; Patterson, D.J.

1992-02-01T23:59:59.000Z

43

A Quick Introduction To CamGrid  

E-Print Network (OSTI)

millions of CPU hours. Great for pump priming research, even student project work. Supports checkpointing (with caveats) for long running jobs. Users need access to only one machine, i.e. a submit host (this is an example of the grid computing paradigm... expressions [Building Condor jobs] MPI MATLAB Mathematica Fortran, R, Stata… Managed Virtualised Machines Xen farm Installation images for various Linux distributions or recent versions of Windows Server http://www.cam.ac.uk/cs/virtual/ Cloud/IaaS storage...

Calleja, Mark; Mazumdar, Paul

2011-09-09T23:59:59.000Z

44

Dual photography  

Science Conference Proceedings (OSTI)

We present a novel photographic technique called dual photography, which exploits Helmholtz reciprocity to interchange the lights and cameras in a scene. With a video projector providing structured illumination, reciprocity permits us to generate pictures ... Keywords: dual photography, image synthesis, image-based relighting

Pradeep Sen; Billy Chen; Gaurav Garg; Stephen R. Marschner; Mark Horowitz; Marc Levoy; Hendrik P. A. Lensch

2005-07-01T23:59:59.000Z

45

Guidelines for Obtaining Compliance Assurance Monitoring (CAM) Permits  

Science Conference Proceedings (OSTI)

Compliance Assurance Monitoring (CAM) is a relatively new regulation that will affect virtually every coal-fired plant in the United States by the end of 2010.

2005-09-30T23:59:59.000Z

46

Achieving Robustness and Minimizing Overhead in Parallel Algorithms Through Overlapped Communication/Computation  

Science Conference Proceedings (OSTI)

One of the major goals in the design of parallel processing machines and algorithms is to achieve robustness and reduce the effects of the overhead introduced when a given problem is parallelized or a fault occurs. A key contributor to overhead is communication ... Keywords: Proteus Parallel Computer System, communication overhead, complete exchange, fault tolerance, overlapping computing and communication, partitioning and scheduling for high-performance

Arun K. Somani; Allen M. Sansano

2000-05-01T23:59:59.000Z

47

DOE-HDBK-1143-2001; Radiological Control Training for Supervisors - Overheads  

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

Control Training for Supervisors Control Training for Supervisors DOE-HDBK-1143-2001 Overheads Office of Environment, Safety & Health U.S. Department of Energy Radiological Control Training for Supervisors DOE-HDBK-1143-2001 Overheads This page intentionally left blank. ii OT 1.1 DOE-HDBK-1143-2001 Overhead 1.1 Regulatory Documents Objectives: * Identify the hierarchy of regulatory documents. * Define the purposes of 10 CFR Parts 820, 830 and 835. * Define the purpose of the DOE Radiological Control Standard. OT 1.2 DOE-HDBK-1143-2001 Overhead 1.2 Regulatory Documents (cont.) Objectives: * Define the terms

48

Perfromance analysis of the Parallel Community Atmosphere Model (CAM) application  

E-Print Network (OSTI)

Efficient execution of parallel applications requires insight into how the parallel system features impact the performance of the application. Significant experimental analysis and the development of performance models enhance the understanding of such an impact. Deep understanding of an application’s major kernels and their design leads to a better understanding of the application’s performance, and hence, leads to development of better performance models. The Community Atmosphere Model (CAM) is the latest in a series of global atmospheric models developed at the National Center for Atmospheric Research (NCAR) as a community tool for NCAR and the university research community. This work focuses on analyzing CAM and understanding the impact of different architectures on this application. In the analysis of CAM, kernel coupling, which quantifies the interaction between adjacent and chains of kernels in an application, is used. All experiments are conducted on four parallel platforms: NERSC (National Energy Research Scientific Computing Center) Seaborg, SDSC (San Diego Supercomputer Center) DataStar P655, DataStar P690 and PSC (Pittsburgh Supercomputing Center) Lemieux. Experimental results indicate that kernel coupling gave an insight into many of the application characteristics. One important characteristic of CAM is that its performance is heavily dependent on a parallel platform memory hierarchy; different cache sizes and different cache policies had the major effect on CAM’s performance. Also, coupling values showed that although CAM’s kernels share many data structures, most of the coupling values are still destructive (i.e., interfering with each other so as to adversely affect performance). The kernel coupling results helps developers in pointing out the bottlenecks in memory usage in CAM. The results obtained from processor partitioning are significant in helping CAM users in choosing the right platform to run CAM.

Shawky Sharkawi, Sameh Sherif

2006-08-01T23:59:59.000Z

49

Effective Methods in Reducing Communication Overheads in Solving  

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

0/2002 Yun (Helen) He, GHC2002 1 0/2002 Yun (Helen) He, GHC2002 1 Effective Methods in Reducing Communication Overheads in Solving PDE Problems on Distributed-Memory Computer Architectures Chris Ding and Yun (Helen) He Lawrence Berkeley National Laboratory 10/10/2002 Yun (Helen) He, GHC2002 2 Outline n Introduction n Traditional Method n Ghost Cell Expansion (GCE) Method n GCE Algorithm n Diagonal Communication Elimination (DCE) Technique n Analysis of GCE Method n Message Volume n Communication Time n Memory Usage and Computational Cost n Performance n Test Problem n Test Results n Conclusions 10/10/2002 Yun (Helen) He, GHC2002 3 Background n On a distributed system, each processor holds a problem

50

A Negative-Overhead, Self-Timed Pipeline  

E-Print Network (OSTI)

This' paper presents' a novel variation of wave pipelining that we call "surfing." In previous wave pipelined designs, timing uncertainty grows' monotonically as events' propagate through gates or other logic elements'. We bound this dispersion by propagating a timing pulse along with the data values. Our logic elements have delays' that are smaller in the presence of the pulse than in its' absence. This' produces a "surfing " effect: events' are bound in close proximity to the timing pulse. We demonstrate this approach with the design of a 4x12 multiplier. Spice simulations from the extracted layout indicate that this design is robust in the presence of fabrication parameter variation and power supply noise. Because timing is' maintained by accelerating the logic, our designs achieve lower latency than their purely combinational equivalents'. Thus, the control overhead for these designs is' indeed negative.

Brian D. Winters; Mark R. Greenstreet

2002-01-01T23:59:59.000Z

51

Experience Based Seismic Verification Guidelines for Overhead Crane Systems: Volume I - Seismic Review Procedure; Volume II - Performance of Overhead Cranes in Strong Motion Earthquakes  

Science Conference Proceedings (OSTI)

This report provides guidelines that can be used to perform an experience-based seismic capability verification of overhead cranes systems at nuclear power plants. The report summarizes seismic experience data from strong-motion earthquakes for these systems and identifies the characteristics of systems that could lead to failure or unacceptable behavior in an earthquake. The seismic experience data show that overhead crane systems exhibit extremely good performance under strong-motion seismic loading, w...

2005-06-08T23:59:59.000Z

52

Efficient Parallel I/O in Community Atmosphere Model (CAM)  

Science Conference Proceedings (OSTI)

Century-long global climate simulations at high resolutions generate large amounts of data in a parallel architecture. Currently, the community atmosphere model (CAM), the atmospheric component of the NCAR community climate system model (CCSM), uses ... Keywords: CAM, climate modeling, index reshuffle, parallel I/O, parallel netCDF

Yu-Heng Tseng; Chris Ding

2008-05-01T23:59:59.000Z

53

An analytical model for input-buffered optical packet switches with reconfiguration overhead  

Science Conference Proceedings (OSTI)

The overhead associated with reconfiguring a switch fabric in optical packet switches is an important issue in relation to the packet transmission time and can adversely affect switch performance. The reconfiguration overhead increases the mean waiting ... Keywords: Batch arrival, Discrete-time system, Optical communication, Stochastic analysis, Stochastic decomposition

Kuan-Hung Chou; Woei Lin

2011-12-01T23:59:59.000Z

54

Cost-free scan: a low-overhead scan path design methodology  

Science Conference Proceedings (OSTI)

Conventional scan design imposes considerable area and delay overhead by using larger scan flip-flops and additional scan wires without utilizing the functionality of the combinational logic. We propose a novel low-overhead scan design methodology, called ... Keywords: Scan design, DFT, Testing

Chih-Chang Lin; Mike Tien-Chien Lee; Malgorzata Marek-Sadowska; Kuang-Chien Chen

1995-12-01T23:59:59.000Z

55

Assessment of Environmental Effects of Current Underground and Overhead Transmission Line Construction and Maintenance in the United States  

Science Conference Proceedings (OSTI)

This report assesses environmental effects of current underground and overhead transmission line construction and maintenance in the United States.

2008-12-18T23:59:59.000Z

56

Cam Wal Electric Coop, Inc | Open Energy Information  

Open Energy Info (EERE)

Cam Wal Electric Coop, Inc Cam Wal Electric Coop, Inc Jump to: navigation, search Name Cam Wal Electric Coop, Inc Place South Dakota Utility Id 2986 Utility Location Yes Ownership C NERC Location MRO NERC MRO Yes Activity Distribution Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png Schedule A Average Rates Residential: $0.1010/kWh Commercial: $0.0796/kWh Industrial: $0.0949/kWh References ↑ "EIA Form EIA-861 Final Data File for 2010 - File1_a" Retrieved from "http://en.openei.org/w/index.php?title=Cam_Wal_Electric_Coop,_Inc&oldid=409157" Categories: EIA Utility Companies and Aliases

57

ChemCam is having a blast on Mars  

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

year). The ChemCam laser onboard the rover directs the equivalent energy of a million light bulbs into a spot the size of a pinhead and in five nanoseconds vaporizes what it...

58

Engine testing of ceramic cam-roller followers  

DOE Green Energy (OSTI)

For several years, DDC has been developing monolithic ceramic heat engine components. One of the components, developed for an application in our state-of-the-art on-highway, heavy-duty diesel engine, the Series 60, is a silicon nitride cam-roller follower. Prior to starting this program, each valve train component in the Series 60 was considered for conversion to a ceramic material. Many advantages and disadvantages (benefits and risks) were considered. From this effort, one component was selected, the cam-roller follower. Using a system design approach, a ceramic cam-roller follower offered functional improvement at a reasonable cost. The purpose of the project was to inspect and test 100 domestically produced silicon nitride cam-roller followers built to the requirements of the DDC series 60 engine.

Kalish, Y. (Detroit Diesel Corp., MI (United States))

1992-04-01T23:59:59.000Z

59

Engine testing of ceramic cam-roller followers. Final report  

DOE Green Energy (OSTI)

For several years, DDC has been developing monolithic ceramic heat engine components. One of the components, developed for an application in our state-of-the-art on-highway, heavy-duty diesel engine, the Series 60, is a silicon nitride cam-roller follower. Prior to starting this program, each valve train component in the Series 60 was considered for conversion to a ceramic material. Many advantages and disadvantages (benefits and risks) were considered. From this effort, one component was selected, the cam-roller follower. Using a system design approach, a ceramic cam-roller follower offered functional improvement at a reasonable cost. The purpose of the project was to inspect and test 100 domestically produced silicon nitride cam-roller followers built to the requirements of the DDC series 60 engine.

Kalish, Y. [Detroit Diesel Corp., MI (United States)

1992-04-01T23:59:59.000Z

60

ChemCam laser first analyses yield beautiful results  

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

laser first analyses ChemCam laser first analyses yield beautiful results The laser instrument has fired nearly 500 shots so far that have produced strong, clear data about the...

Note: This page contains sample records for the topic "dual overhead cam" 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

Dual photography  

E-Print Network (OSTI)

Figure 1: (a) Conventional photograph of a scene, illuminated by a projector with all its pixels turned on. (b) After measuring the light transport between the projector and the camera using structured illumination, our technique is able to synthesize a photorealistic image from the point of view of the projector. This image has the resolution of the projector and is illuminated by a light source at the position of the camera. The technique can capture subtle illumination effects such as caustics and self-shadowing. Note, for example, how the glass bottle in the primal image (a) appears as the caustic in the dual image (b) and vice-versa. Because we have determined the complete light transport between the projector and camera, it is easy to relight the dual image using a synthetic light source (c) or a light modified by a matte captured later by the same camera (d). We present a novel photographic technique called dual photography, which exploits Helmholtz reciprocity to interchange the lights and cameras in a scene. With a video projector providing structured illumination, reciprocity permits us to generate pictures from the viewpoint of the projector, even though no camera was present at that location. The technique is completely image-based, requiring no knowledge of scene geometry or surface properties, and

Pradeep Sen; Billy Chen; Gaurav Garg; Stephen R. Marschner; Mark Horowitz; Marc Levoy; Hendrik P. A. Lensch

2005-01-01T23:59:59.000Z

62

Life-Cycle Cost Analysis Overhead Transmission Lines (LCCA) Version 1.1  

Science Conference Proceedings (OSTI)

The LCCA software is a tool to assist transmission line designers in selecting the optimized design for an overhead line by comparing the life-cycle cost of various design options. Windows2000, XP, and Vista Excel 2003 and 2007

2011-12-15T23:59:59.000Z

63

Radial Temperature Gradients of Overhead Conductors: Impact on Sag and Rating Calculations  

Science Conference Proceedings (OSTI)

It is critical for power companies to have a good understanding of the temperatures at which the bare phase conductors in their overhead transmission lines operate, particularly during system emergencies. Overhead lines are designed to have adequate clearance and normal aging for a maximum allowable conductor temperature (MACT). At or near the MACT, the electrical clearances to people, objects, buildings, and other lower-voltage conductors are at their minimum, and the design limit on loss of ...

2012-12-12T23:59:59.000Z

64

Transport Devices for Overhead Conductors: State of the Art Review and Promising Technologies  

Science Conference Proceedings (OSTI)

This report summarizes activities surrounding the possible development of a transmission line inspection robot as a transport device for overhead conductors. EPRI research on technologies for inspection of transmission line conductors had identified the need for a highly automated transport device to apply available inspection technologies along the length of a transmission line with minimal human intervention. A literature search was performed to identify past robotics work applied to overhead power lin...

2003-12-11T23:59:59.000Z

65

Live Working Considerations in Design and Construction of Overhead Transmission Lines  

Science Conference Proceedings (OSTI)

Live working (LW) on overhead transmission lines is the performance of maintenance, construction, and inspection of equipment and circuits that are energized or that may become energized. This report discusses aspects of design and construction of overhead transmission lines that are important to (LW) and examines design modifications that can significantly impact the safe, efficient, and cost-effective performance of LW. This guidance should help line designers identify ways to incorporate the ...

2013-12-02T23:59:59.000Z

66

Dual capacity reciprocating compressor  

DOE Patents (OSTI)

A multi-cylinder compressor particularly useful in connection with northern climate heat pumps and in which different capacities are available in accordance with reversing motor rotation is provided with an eccentric cam on a crank pin under a fraction of the connecting rods, and arranged for rotation upon the crank pin between opposite positions 180[degree] apart so that with cam rotation on the crank pin such that the crank throw is at its normal maximum value all pistons pump at full capacity, and with rotation of the crank shaft in the opposite direction the cam moves to a circumferential position on the crank pin such that the overall crank throw is zero. Pistons whose connecting rods ride on a crank pin without a cam pump their normal rate with either crank rotational direction. Thus a small clearance volume is provided for any piston that moves when in either capacity mode of operation. 6 figs.

Wolfe, R.W.

1984-10-30T23:59:59.000Z

67

Dual capacity reciprocating compressor  

DOE Patents (OSTI)

A multi-cylinder compressor 10 particularly useful in connection with northern climate heat pumps and in which different capacities are available in accordance with reversing motor 16 rotation is provided with an eccentric cam 38 on a crank pin 34 under a fraction of the connecting rods, and arranged for rotation upon the crank pin between opposite positions 180.degree. apart so that with cam rotation on the crank pin such that the crank throw is at its normal maximum value all pistons pump at full capacity, and with rotation of the crank shaft in the opposite direction the cam moves to a circumferential position on the crank pin such that the overall crank throw is zero. Pistons 24 whose connecting rods 30 ride on a crank pin 36 without a cam pump their normal rate with either crank rotational direction. Thus a small clearance volume is provided for any piston that moves when in either capacity mode of operation.

Wolfe, Robert W. (Wilkinsburg, PA)

1984-01-01T23:59:59.000Z

68

Dual Arm Work Module Development and Appplications  

SciTech Connect

The dual arm work module (DAWM) was developed at Oak Ridge National Laboratory (ORNL) by the Robotics Technology Development Program (RTDP) as a development test bed to study issues related to dual arm manipulation, including platform cotilguration, controls, automation, operations, and tooling. The original platform was based on two Schilling Titan II manipulators mounted to a 5-degree-of- freedom (DOF) base fabricated by RedZone Robotics, Inc. The 5-DOF articulation provided a center torso rotation, linear actuation to change the separation between the arms, and arm base rotation joints to provide "elbows up," elbows down," or "elbows out" orientation. A series of tests were conducted on operations, tooling, and task space scene analysis (TSSA)-driven robotics for overhead transporter- mounted and crane hook-deployed scenarios. A concept was developed for DAWM deployment from a large remote work vehicle, but the project was redirected to support dismantlement of the Chicago Pile #5 (CP-5) reactor at Argonne National Laboratory in fiscal year (FY) 1997. Support of CP-5 required a change in focus of the dual arm technology from that of a development test bed to a system focussed for a specific end user. ORNL teamed with the Idaho National Environmental ,Engineering Laboratory, Sandia National Laboratory, and the Savannah River Technology Center to deliver a crane-deployed derivative of the DAWM, designated the dual arm work platform (DAWP). RTDP staff supported DAWP at CP-5 for one FY; Argonne staff continued operation through to dismantlement of the reactor internals. Lessons learned from this interaction were extensive. Beginning in FY 1999, dual arm development activities are again being pursued in the context of those lessons learned. This paper describes the progression of philosophy of the DAWM from initial test bed to lessons learned through interaction at CP-5 and to the present investigation of telerobotic assist of teleoperation and TSSA- driven robotics.

Noakes, M.W.

1999-04-25T23:59:59.000Z

69

Cam-driven valve system for steam turbines  

SciTech Connect

This patent describes, in a steam turbine system including a source of motive steam and a turbine adapted to operate at less than a full load, the turbine including an improved cam-driven valve system for activating a varying number of steam control valves to permit transferring between a maximum arc-admission mode and a minimum arc-admission mode. It comprises: a steam chest for receiving the motive steam from the source, the steam chest including a plurality of valves connected to a corresponding turbine section and set for a minimum admission of motive steam into the turbine below 100 percent; a first cam lift means for actuating a portion of the valves and second cam lift means for actuating the remainder of the valves.

Silvestri, G.J. Jr.

1990-02-27T23:59:59.000Z

70

Dark Energy Cam: Fermilab Expands Understanding of Expanding Universe |  

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

Dark Energy Cam: Fermilab Expands Understanding of Expanding Dark Energy Cam: Fermilab Expands Understanding of Expanding Universe Dark Energy Cam: Fermilab Expands Understanding of Expanding Universe March 12, 2012 - 12:06pm Addthis Researchers at Fermi National Lab team stand beside the 570-megapixels, five-ton Dark Energy camera, which will be capable of measuring the expansion of the universe - and developing better models about how dark energy works. | Photo by Reidar Hahn, Fermi National Lab Researchers at Fermi National Lab team stand beside the 570-megapixels, five-ton Dark Energy camera, which will be capable of measuring the expansion of the universe - and developing better models about how dark energy works. | Photo by Reidar Hahn, Fermi National Lab Charles Rousseaux Charles Rousseaux Senior Writer, Office of Science

71

Dark Energy Cam: Fermilab Expands Understanding of Expanding Universe |  

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

Dark Energy Cam: Fermilab Expands Understanding of Expanding Dark Energy Cam: Fermilab Expands Understanding of Expanding Universe Dark Energy Cam: Fermilab Expands Understanding of Expanding Universe March 12, 2012 - 12:06pm Addthis Researchers at Fermi National Lab team stand beside the 570-megapixels, five-ton Dark Energy camera, which will be capable of measuring the expansion of the universe - and developing better models about how dark energy works. | Photo by Reidar Hahn, Fermi National Lab Researchers at Fermi National Lab team stand beside the 570-megapixels, five-ton Dark Energy camera, which will be capable of measuring the expansion of the universe - and developing better models about how dark energy works. | Photo by Reidar Hahn, Fermi National Lab Charles Rousseaux Charles Rousseaux Senior Writer, Office of Science

72

MegaPipe: the MegaCam image stacking pipeline  

E-Print Network (OSTI)

This paper describes the MegaPipe image processing pipeline at the Canadian Astronomical Data Centre (CADC). The pipeline takes multiple images from the MegaCam mosaic camera on CFHT and combines them into a single output image. MegaPipe takes as input detrended MegaCam images and does a careful astrometric and photometric calibration on them. The calibrated images are then resampled and combined into image stacks. MegaPipe is run on PI data by request, data from large surveys (the CFHT Legacy Survey and the Next Generation Virgo Survey) and all non-proprietary MegaCam data in the CFHT archive. The stacked images and catalogs derived from these images are available through the CADC website. Currently, 1500 square degrees have been processed.

Gwyn, Stephen D J

2009-01-01T23:59:59.000Z

73

EA-0962: Construction and Routine Operation of a 12-kilovolt Overhead  

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

62: Construction and Routine Operation of a 12-kilovolt 62: Construction and Routine Operation of a 12-kilovolt Overhead Powerline and Formal Authorization for a 10-inch and 8-inch Fresh Water Pipeline Right-of-Way at Naval Petroleum Reserve No. 1, Kern County, California EA-0962: Construction and Routine Operation of a 12-kilovolt Overhead Powerline and Formal Authorization for a 10-inch and 8-inch Fresh Water Pipeline Right-of-Way at Naval Petroleum Reserve No. 1, Kern County, California SUMMARY This EA evaluates the environmental impacts of the proposal to install an overhead powerline extension from the U.S. Department of Energy's Naval Petroleum Reserve No. 1 (NPR-1) power source to the WKWD Station A, which will significantly reduce NPR-1's overall utility costs. NPR-1 is known as Elk Hills oil field and is located in the southern San Joaquin Valley,

74

A Neural Network Model for Construction Projects Site Overhead Cost Estimating in Egypt  

E-Print Network (OSTI)

Estimating of the overhead costs of building construction projects is an important task in the management of these projects. The quality of construction management depends heavily on their accurate cost estimation. Construction costs prediction is a very difficult and sophisticated task especially when using manual calculation methods. This paper uses Artificial Neural Network (ANN) approach to develop a parametric cost-estimating model for site overhead cost in Egypt. Fifty-two actual real-life cases of building projects constructed in Egypt during the seven year period 2002-2009 were used as training materials. The neural network architecture is presented for the estimation of the site overhead costs as a percentage from the total project price.

ElSawy, Ismaail; Razek, Mohammed Abdel

2011-01-01T23:59:59.000Z

75

Proceedings of the Inspection and Assessment of Overhead Transmission Line Equipment Workshop: 13 – 15 May 2003, Monterey, CA  

Science Conference Proceedings (OSTI)

This report contains papers and materials presented at the Inspection and Assessment of Overhead Transmission Line Equipment Workshop held in Monterey, California in May of 2003.

2003-12-15T23:59:59.000Z

76

www.eprg.group.cam.ac.uk EPRGWORKINGPAPERNON-TECHNICALSUMMARY  

E-Print Network (OSTI)

www.eprg.group.cam.ac.uk EPRGWORKINGPAPERNON-TECHNICALSUMMARY Nuclear Energy in the Enlarged Russia and Ukraine. Interrrupted heating in European cities on cold winter nights adds a new dimension in central and eastern Europe for nuclear power. This working paper notes that with the addition of 12 new

Aickelin, Uwe

77

Observed and CAM3 GCM Sea Surface Wind  

E-Print Network (OSTI)

Observed and CAM3 GCM Sea Surface Wind Speed Distributions: Characterization, Comparison, and Bias climatological surface wind speed probability density functions (PDFs) estimated from observations and use them to evaluate, for the first time, contemporaneous wind PDFs predicted by a GCM. The ob- servations include NASA

Zender, Charles

78

DietCam: Automatic dietary assessment with mobile camera phones  

Science Conference Proceedings (OSTI)

Obesity has become a severe health problem in developed countries, and a healthy food intake has been recognized as the key factor for obesity prevention. This paper presents a mobile phone based system, DietCam, to help assess food intakes with few ... Keywords: Calorie estimation, Food intake assessment, Mobile phones

Fanyu Kong; Jindong Tan

2012-02-01T23:59:59.000Z

79

www.eprg.group.cam.ac.uk EPRGWORKINGPAPER  

E-Print Network (OSTI)

quarter of the EU's natural gas consumption, or 6.5% of the bloc's primary energy supply (Nol, 2008; Nol supply function has been applied in natural gas market modelling (e.g., Egging and Gabriel (2006), Eggingwww.eprg.group.cam.ac.uk EPRGWORKINGPAPER Abstract Strategic Eurasian Natural Gas Model for Energy

Aickelin, Uwe

80

www.eprg.group.cam.ac.uk EPRGWORKINGPAPERNON-TECHNICALSUMMARY  

E-Print Network (OSTI)

in forward markets, due to the high associated storage costs of natural gas and hard coal. Furthermore are self-hedged to the extent that power, natural gas and carbon prices naturally co-move. In particular hard coal and natural #12;www.eprg.group.cam.ac.uk EPRGWORKINGPAPERNON-TECHNICALSUMMARY gas

Kraft, Markus

Note: This page contains sample records for the topic "dual overhead cam" 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

Dynamic Simulation of Lightning Attachment to Earthed Overhead Transmission Line Structures  

Science Conference Proceedings (OSTI)

In this paper a novel method is presented to investigate lightning stroke attachment to earthed overhead transmission line structures. This method is based on the dynamic simulation of lightning downward leader movement toward the ground in three dimensions. ... Keywords: charge simulation method, downward leader, lightning, transmission line, upward leader

Mohammad Reza Bank Tavakoli; Behrooz Vahidi

2010-07-01T23:59:59.000Z

82

Overhead energy considerations for efficient routing in wireless sensor networks q  

E-Print Network (OSTI)

Energy is the most critical resource in the life of a wireless sensor node. Therefore, its usage must be optimized to maximize the network life. It is known that for higher path loss exponent values, utilizing shorter communication links reduces the transmitter energy, whenever the radio equipment has power adjustment capability. Although the transmitter energy is one of the major factors of total energy dissipation, neglecting the overhead energy could result in suboptimal energy usage. Routing algorithms should also be concerned about the overhead energy which is wasted at each hop of data transfer. In this paper, we investigate the use of multi-hop communication links and compare the amount of energy gain upon alternative routes using analytical techniques. We show that employing multi-hop links does not always result in energy gain, and try to quantify situations when it is advantageous. The analytical results are used in routing decisions and their effect in energy efficiency is validated using simulations. Moreover, we also quantify the gain achieved in terms of lifetime by considering overhead energy on power adjustable sensors for different environmental conditions. We show that the network lifetime can dramatically decrease, if the overhead energy component is neglected during routing decisions.

E. Ilker Oyman; Cem Ersoy

2004-01-01T23:59:59.000Z

83

EPRI Overhead Transmission Line Inspection - Online Training (OTLOT) Version 8.0  

Science Conference Proceedings (OSTI)

This course describes the different types of compression connectors for overhead transmission lines and their application, construction, degradation and failure modes, inspection and assessment methods, and remediation techniques.    Benefits & Value:Proper Construction and Installation of Compression Connectors will allow for the following:Self-paced learning opportunityReduced cost of travel and time outside the ...

2012-11-13T23:59:59.000Z

84

Multi-stage programming with functors and monads: Eliminating abstraction overhead from generic code  

Science Conference Proceedings (OSTI)

We use multi-stage programming, monads and Ocaml's advanced module system to demonstrate how to eliminate all abstraction overhead from generic programs, while avoiding any inspection of the resulting code. We demonstrate this clearly with Gaussian Elimination ... Keywords: Functor, Generative, Genericity, Linear algebra, MetaOCaml, Staging, Symbolic

Jacques Carette; Oleg Kiselyov

2011-05-01T23:59:59.000Z

85

Predicting energy and performance overhead of real-time operating systems  

Science Conference Proceedings (OSTI)

We present a high-level method for rapidly and accurately estimating energy and performance overhead of Real-Time Operating Systems. Unlike most other approaches, which rely on Transaction-Level Modeling (TLM), we infer the information we need directly ...

Sandro Penolazzi; Ingo Sander; Ahmed Hemani

2010-03-01T23:59:59.000Z

86

Thermal and Corona Models of Overhead Transmission Lines Operating at High Temperatures  

Science Conference Proceedings (OSTI)

In an attempt to meet increasing demand by pushing more power through existing lines, the power industry has frequently resorted to operating overhead transmission lines at higher temperatures than ever before. There is reason to believe that the empirical models developed in the past for determining conductor temperature and corona performance are in error at these elevated temperatures. In an effort to safely and reliably push more power, it will be important for utilities to understand the temperature...

2007-12-11T23:59:59.000Z

87

Electrical and mechanical design criteria for EHV and UHV: overhead transmission lines  

Science Conference Proceedings (OSTI)

The results are presented of a program devoted to the selection of electrical and mechanical design criteria and parameters for overhead power transmission lines for ac systems rated at from 345 to 1100 kV and for dc systems rated at from 600 to 1200 kV. Information is included on the environmental effects, i.e., audible noise and electric fields, of the lines, mechanical and economic requirements, safety, failures, grounding, and lightning protection. (LCL)

Not Available

1980-06-01T23:59:59.000Z

88

Survey of Utility Practices for Rating Overhead Transmission Line and Component Condition: Survey Results  

Science Conference Proceedings (OSTI)

Utilities have expressed an interest in using analytical tools and methods for evaluating the condition of their overhead transmission facilities and line components. These analytical techniques are intended to provide a systematic approach to ensure that planned expenditures for inspection and maintenance programs are being applied in the most cost-effective way that benefits the organization and public as a whole. Prescriptive or time-based methods used by the utilities for many years might not be ...

2013-12-22T23:59:59.000Z

89

Proceedings of the First Overhead Transmission Line Equipment and Maintenance Practices Conference: 14-16 May 2002, Monterey, CA  

Science Conference Proceedings (OSTI)

This report contains the presentation material and papers from the 1st Overhead Transmission Line Equipment and Maintenance Practices Conference held in Monterey, California, May 14-16, 2002.

2002-07-29T23:59:59.000Z

90

LANL's ChemCam conducts first laser test over the weekend | National...  

National Nuclear Security Administration (NNSA)

LANL's ChemCam conducts first laser test over the weekend | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the...

91

Inspection and Assessment of Overhead Transmission Line Hardware, Conductors and Shield Wires: Technology Overview of Conductor Inspection Tools  

Science Conference Proceedings (OSTI)

This report summarizes in detail the theory and operation of technologies for the inspection of overhead transmission line conductors and evaluates their effectiveness. It covers existing technologies and technologies that are commercially available but have the promise of becoming effective screening and, in some cases, predictive tools in the future. Technologies described and assessed include:The Cormon overhead line corrosion detectorThe Cross-Checker ...

2013-12-22T23:59:59.000Z

92

A Prospective, Multicenter Study of Complementary/Alternative Medicine (CAM) Utilization During Definitive Radiation for Breast Cancer  

Science Conference Proceedings (OSTI)

Purpose: Although complementary and alternative medicine (CAM) utilization in breast cancer patients is reported to be high, there are few data on CAM practices in breast patients specifically during radiation. This prospective, multi-institutional study was conducted to define CAM utilization in breast cancer during definitive radiation. Materials/Methods: A validated CAM instrument with a self-skin assessment was administered to 360 Stage 0-III breast cancer patients from 5 centers during the last week of radiation. All data were analyzed to detect significant differences between users/nonusers. Results: CAM usage was reported in 54% of the study cohort (n=194/360). Of CAM users, 71% reported activity-based CAM (eg, Reiki, meditation), 26% topical CAM, and 45% oral CAM. Only 16% received advice/counseling from naturopathic/homeopathic/medical professionals before initiating CAM. CAM use significantly correlated with higher education level (P<.001), inversely correlated with concomitant hormone/radiation therapy use (P=.010), with a trend toward greater use in younger patients (P=.066). On multivariate analysis, level of education (OR: 6.821, 95% CI: 2.307-20.168, P<.001) and hormones/radiation therapy (OR: 0.573, 95% CI: 0.347-0.949, P=.031) independently predicted for CAM use. Significantly lower skin toxicity scores were reported in CAM users vs nonusers, respectively (mild: 34% vs 25%, severe: 17% vs 29%, P=.017). Conclusion: This is the first prospective study to assess CAM practices in breast patients during radiation, with definition of these practices as the first step for future investigation of CAM/radiation interactions. These results should alert radiation oncologists that a large percentage of breast cancer patients use CAM during radiation without disclosure or consideration for potential interactions, and should encourage increased awareness, communication, and documentation of CAM practices in patients undergoing radiation treatment for breast cancer.

Moran, Meena S., E-mail: meena.moran@yale.edu [Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, Connecticut (United States); Department of Radiation Therapy, William W. Backus Hospital, Norwich, Connecticut (United States); Ma Shuangge [Department of Epidemiology and Public Health, Yale University, New Haven, Connecticut (United States)] [Department of Epidemiology and Public Health, Yale University, New Haven, Connecticut (United States); Jagsi, Reshma [University of Michigan, Department of Radiation Oncology, Ann Arbor, MI (United States)] [University of Michigan, Department of Radiation Oncology, Ann Arbor, MI (United States); Yang, Tzu-I Jonathan [Yale University School of Medicine, New Haven, Connecticut (United States)] [Yale University School of Medicine, New Haven, Connecticut (United States); Higgins, Susan A. [Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, Connecticut (United States) [Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, Connecticut (United States); Department of Radiation Therapy, Shoreline Medical Center, Guilford, Connecticut (United States); Weidhaas, Joanne B. [Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, Connecticut (United States)] [Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, Connecticut (United States); Wilson, Lynn D. [Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, Connecticut (United States) [Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, Connecticut (United States); Department of Radiation Therapy, Lawrence and Memorial Hospital, New London, Connecticut (United States); Lloyd, Shane [Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, Connecticut (United States)] [Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, Connecticut (United States); Peschel, Richard [Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, Connecticut (United States) [Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, Connecticut (United States); Department of Radiation Therapy, Lawrence and Memorial Hospital, New London, Connecticut (United States); Gaudreau, Bryant [Department of Radiation Therapy, William W. Backus Hospital, Norwich, Connecticut (United States)] [Department of Radiation Therapy, William W. Backus Hospital, Norwich, Connecticut (United States); Rockwell, Sara [Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, Connecticut (United States)] [Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, Connecticut (United States)

2013-01-01T23:59:59.000Z

93

Exploratory High-Resolution Climate Simulations using the Community Atmosphere Model (CAM)  

Science Conference Proceedings (OSTI)

Extended, high-resolution (0.23°lat ×0.31°lon) simulations with Community Atmosphere Model versions 4 and 5 (CAM4 and CAM5) are examined and compared with results from climate simulations conducted at a more typical resolution of 0.9°lat ×1.25°...

Julio T. Bacmeister; Michael F. Wehner; Richard B. Neale; Andrew Gettelman; Cecile Hannay; Peter H. Lauritzen; Julie M. Caron; John E. Truesdale

94

Aerosol Influence on Mixed-Phase Clouds in CAM-Oslo  

Science Conference Proceedings (OSTI)

A new treatment of mixed-phase cloud microphysics has been implemented in the general circulation model, Community Atmosphere Model (CAM)-Oslo, which combines the NCAR CAM2.0.1 and a detailed aerosol module. The new treatment takes into account ...

Trude Storelvmo; Jón Egill Kristjánsson; Ulrike Lohmann

2008-10-01T23:59:59.000Z

95

CCSM–CAM3 Climate Simulation Sensitivity to Changes in Horizontal Resolution  

Science Conference Proceedings (OSTI)

The latest version of the Community Climate System Model (CCSM) Community Atmosphere Model version 3 (CAM3) has been released to allow for numerical integration at a variety of horizontal resolutions. One goal of the CAM3 design was to provide ...

James J. Hack; Julie M. Caron; G. Danabasoglu; Keith W. Oleson; Cecilia Bitz; John E. Truesdale

2006-06-01T23:59:59.000Z

96

ChemCam laser sets its sights on first martian target  

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

First martian target First martian target ChemCam laser sets its sights on first martian target The successful capture of ChemCam's first 10 photos sets the stage for the first test bursts of the instrument's rock-zapping laser in the near future. August 17, 2012 Curiosity zaps Mars for vital signs: ChemCam, designed by Lab team, looks for elements such as carbon, nitrogen, and oxygen, all of which are crucial for life. Curiosity zaps Mars for vital signs: ChemCam, designed by Lab team, looks for elements such as carbon, nitrogen, and oxygen, all of which are crucial for life. Contact James E. Rickman Communications Office (505) 665-9203 Email "The successful delivery of these photos means we can begin efforts in earnest for the first images of Mars rocks by the ChemCam instrument and

97

Model-Based Engineering and Manufacturing CAD/CAM Benchmark  

Science Conference Proceedings (OSTI)

The Benehmark Project was created from a desire to identify best practices and improve the overall efficiency and performance of the Y-12 Plant's systems and personnel supprting the manufacturing mission. The mission of the benchmark team was to search out industry leaders in manufacturing and evaluate lheir engineering practices and processes to determine direction and focus fm Y-12 modmizadon efforts. The companies visited included several large established companies and anew, small, high-tech machining firm. As a result of this efforL changes are recommended that will enable Y-12 to become a more responsive cost-effective manufacturing facility capable of suppordng the needs of the Nuclear Weapons Complex (NW@) and Work Fw Others into the 21' century. The benchmark team identified key areas of interest, both focused and gencml. The focus arm included Human Resources, Information Management, Manufacturing Software Tools, and Standarda/ Policies and Practices. Areas of general interest included Inhstructure, Computer Platforms and Networking, and Organizational Structure. The method for obtaining the desired information in these areas centered on the creation of a benchmark questionnaire. The questionnaire was used throughout each of the visits as the basis for information gathering. The results of this benchmark showed that all companies are moving in the direction of model-based engineering and manufacturing. There was evidence that many companies are trying to grasp how to manage current and legacy data. In terms of engineering design software tools, the companies contacted were using both 3-D solid modeling and surfaced Wire-frame models. The manufacturing computer tools were varie4 with most companies using more than one software product to generate machining data and none currently performing model-based manufacturing (MBM) ftom a common medel. The majority of companies were closer to identifying or using a single computer-aided design (CAD) system than a single computer-aided manufacturing (CAM) system. The Inteznet was a technology that all companies were considering to either transport information more easily throughout the corporation or as a conduit for business, as the small firm was doing Successfully. Because PrdEngineer is the de facto CAD standard fbr the NWC, the Benchmark Team targeted companies using Parametric Technology Corporation (PTC) software tools. Most of the companies used Pm'Engineer for design to some degree, but found the PTC CAM product, PdManufacture lacking as compared to alternate CAM solutions. All of the companies visited fOund the data exchange between CAD/CAM systems problematic. It was apparent that these companies were trying to consolidate their software tools to reduce translation but had not been able to do so because no single solution had all the needed capabilities. In regard to organizational slructure and human resoukes, two companies were found to be using product or program teams. These teams consisted of the technical staff capable of completing the entire task and were xmintained throughout the project. This same strategy was evident at another of the companies but with more mobility of members. For all eornpanies visited except the small ~ work structure breakdown and responsibility were essentially the same as Y-12's at this time. The functions of numerical control (NC), desi~ and process planning were separate and distinct. The team made numerous recommendations that are detailed in the report.

Domm, T.D.; Underwood, R.S.

1999-04-26T23:59:59.000Z

98

Optimizing the replacement of overhead lines in rural distribution systems with respect to reliability and customer value  

E-Print Network (OSTI)

In this paper we present a method for establishing the value of a network’s components from a reliability worth perspective. The method can be applied to a general distribution system i.e. both for radial and meshed network systems. Moreover, this paper shows results from an application study for a rural network system that is dominated by overhead lines. The purpose of the study was to establish the value of a secondary feeding point. Further, the method is used to establish the best replacement strategy for the concerned overhead lines.

Patrik Hilber; Bengt Hällgren; Lina Bertling

2005-01-01T23:59:59.000Z

99

CAM operated tool for proximate or remote holding of an object  

DOE Patents (OSTI)

A tool for releasably holding an object includes a receptacle having an outer sleeve and a rotatable inner sleeve. The inner sleeve is coaxially positioned within the outer sleeve and includes a locking member. An insert which is adapted to be operably associated with the receptacle includes a cam. The cam includes a guide and a slot so that when the cam is inserted into the inner sleeve, the guide aligns the locking member with the slot allowing the locking member to engage the slot thereby holding the receptacle and the insert together.

Schrum, P.B.; Gajdzik, G.P. Jr.

1995-12-31T23:59:59.000Z

100

The Reliability Investigation on ACSR Splice Connector Systems Used in Overhead Power transmission Lines  

SciTech Connect

Due to material discontinuity and inherited forming mechanism from a crimped-type splice connector, the associated conductor-connector system is highly sensitive to system components aging, especially during high-temperature operations. Furthermore, due to the increase in power demand and limited investment in new infrastructure, existing overhead power transmission lines often need to operate at temperatures higher than the original designed values. This has led to the accelerated aging and degradation of conductor-connector systems. The implications of connector aging are two-fold: (1) significant increase in resistivity of the splice connector and (2) significant reduction in the connector clamping strength. Therefore, splice connectors are one of the weakest links in the electric power transmission infrastructure. In this paper we will discuss the reliability of splice connector systems, including both single stage and two stage splice connectors, used in ACSR conductor of transmission lines under high temperature operations.

Wang, Jy-An John [ORNL; Jiang, Hao [ORNL; Ren, Fei [ORNL

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "dual overhead cam" 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

Development Testing of the Global Climate Model CESM/CAM | Argonne  

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

Development Testing of the Global Climate Model CESM/CAM Development Testing of the Global Climate Model CESM/CAM Event Sponsor: Argonne Leadership Computing Facility Seminar Start Date: Dec 16 2013 - 10:30am Building/Room: Building 240/Room 4301 Location: Argonne National Laboratory Speaker(s): Chris A. Fischer Speaker(s) Title: National Center for Atmospheric Research The Community Earth System Model (CESM) and Community Atmosphere Model (CAM) are community models involving several different developers. With so many different developers it becomes imperative to carry out continuous testing during development. I'll provide a brief introduction to CESM and CAM then cover the testing that is being carried out on both. The Community Earth System Model (CESM) is a global climate model used to predict past, present and future climates. CESM is a fully couple model,

102

Climate Change Projections in CESM1(CAM5) Compared to CCSM4  

Science Conference Proceedings (OSTI)

Future climate change projections for phase 5 of the Coupled Model Intercomparison Project (CMIP5) are presented for the Community Earth System Model version 1 that includes the Community Atmospheric Model version 5 [CESM1(CAM5)]. These results ...

Gerald A. Meehl; Warren M. Washington; Julie M. Arblaster; Aixue Hu; Haiyan Teng; Jennifer E. Kay; Andrew Gettelman; David M. Lawrence; Benjamin M. Sanderson; Warren G. Strand

2013-09-01T23:59:59.000Z

103

GammaCam Technology Demonstration at ORNL Buildings 3026C and 3026D  

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

The GammaCam system is an effective tool for remotely identifying high gamma radiation in radioactive environments.  Its versatility allows the user to perform preliminary characterization of an...

104

DART/CAM: An Ensemble Data Assimilation System for CESM Atmospheric Models  

Science Conference Proceedings (OSTI)

The Community Atmosphere Model (CAM) has been interfaced to the Data Assimilation Research Testbed (DART), a community facility for ensemble data assimilation. This provides a large set of data assimilation tools for climate model research and ...

Kevin Raeder; Jeffrey L. Anderson; Nancy Collins; Timothy J. Hoar; Jennifer E. Kay; Peter H. Lauritzen; Robert Pincus

2012-09-01T23:59:59.000Z

105

A Characterization of Tropical Transient Activity in the CAM3 Atmospheric Hydrologic Cycle  

Science Conference Proceedings (OSTI)

The Community Atmosphere Model version 3 (CAM3) is the latest generation of a long lineage of general circulation models produced by a collaboration between the National Center for Atmospheric Research (NCAR) and the scientific research ...

Philip J. Rasch; Mark J. Stevens; Lucrezia Ricciardulli; Aiguo Dai; Andrew Negri; Robert Wood; Byron A. Boville; Brian Eaton; James J. Hack

2006-06-01T23:59:59.000Z

106

facial reduction and extended duals  

E-Print Network (OSTI)

Facial reduction and extended duals Here we study two fundamental approaches ...... denberghe, and Henry Wolkowicz, editors, Handbook of semidefinite ...

107

Dual generalized Bernstein basis  

Science Conference Proceedings (OSTI)

The generalized Bernstein basis in the space @P"n of polynomials of degree at most n, being an extension of the q-Bernstein basis introduced by Philips [Bernstein polynomials based on the q-integers, Ann. Numer. Math. 4 (1997) 511-518], is given by the ... Keywords: Bernstein basis, Big q-Jacobi polynomials, Discrete Bernstein basis, Dual basis, Generalized Bernstein basis, Little q-Jacobi polynomials, Shifted Jacobi polynomials, q -Bernstein basis

Stanis?aw Lewanowicz; Pawe? Wo?ny

2006-02-01T23:59:59.000Z

108

Prediction of Ice Crystal Number in Community Atmospheric Model (CAM3.0)  

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

Prediction of Ice Crystal Number in Community Atmospheric Model (CAM3.0) Prediction of Ice Crystal Number in Community Atmospheric Model (CAM3.0) Liu, Xiaohong Pacific Northwest National Laboratory Ghan, Steven Pacific Northwest National Laboratory Wang, M University of Michigan Penner, Joyce University of Michigan Category: Modeling A prognostic equation of ice crystal number concentrations is implemented in the Community Atmospheric Model (CAM3.0) with the aim to study the aerosol effects on climate through changing the ice cloud properties. The microphysical processes affecting the ice number concentration include ice nucleation, secondary production of crystals, and the conversion of ice to snow. For ice nucleation process, Liu and Penner (2005) parameterization of homogeneous nucleation of sulfate and heterogeneous immersion nucleation on

109

Inclusion of Ice Microphysics in the NCAR Community Atmospheric Model Version 3 (CAM3)  

SciTech Connect

A prognostic equation for ice crystal number concentration together with an ice nucleation scheme are implemented in the National Center for Atmospheric Research (NCAR) Community Atmospheric Model Version 3 (CAM3) with the aim of studying the indirect effect of aerosols on cold clouds. The effective radius of ice crystals which is used in the radiation and gravitational settlement calculations is now calculated from model predicted mass and number of ice crystals rather than diagnosed as a function of temperature. We add a water vapor deposition scheme to replace the condensation and evaporation (C-E) in the standard CAM3 for ice clouds. The repartitioning of total water into liquid and ice in mixed-phase clouds as a function of temperature is removed, and ice supersaturation is allowed. The predicted ice water content in the modified CAM3 is in better agreement with the Aura MLS data than that in the standard CAM3. The cirrus cloud fraction near the tropical tropopause, which is underestimated in the standard CAM3, is increased, and the cold temperature bias there is reduced by 1-2 °K. However, an increase in the cloud fraction in polar regions makes the underestimation of downwelling shortwave radiation in the standard CAM3 even worse. A sensitivity test reducing the threshold relative humidity with respective to ice (RHi) for heterogeneous ice nucleation from 120% to 105% (representing nearly perfert ice nuclei) increases the global cloud cover by 1.7%, temperature near the tropical tropopause by 4-5 °K, and water vapor in the stratosphere by 50-90%.

Liu, Xiaohong; Penner, Joyce E.; Ghan, Steven J.; Wang, M.

2007-09-15T23:59:59.000Z

110

Calibrating the ChemCam LIBS for Carbonate Minerals on Mars  

DOE R&D Accomplishments (OSTI)

The ChemCam instrument suite on board the NASA Mars Science Laboratory (MSL) rover includes the first LIBS instrument for extraterrestrial applications. Here we examine carbonate minerals in a simulated martian environment using the LIDS technique in order to better understand the in situ signature of these materials on Mars. Both chemical composition and rock type are determined using multivariate analysis (MVA) techniques. Composition is confirmed using scanning electron microscopy (SEM) techniques. Our initial results suggest that ChemCam can recognize and differentiate between carbonate materials on Mars.

Wiens, Roger C.; Clegg, Samuel M.; Ollila, Ann M.; Barefield, James E.; Lanza, Nina; Newsom, Horton E.

2009-00-00T23:59:59.000Z

111

CAM-SE: A scalable spectral element dynamical core for the Community Atmosphere Model  

Science Conference Proceedings (OSTI)

The Community Atmosphere Model (CAM) version 5 includes a spectral element dynamical core option from NCAR's High-Order Method Modeling Environment. It is a continuous Galerkin spectral finite-element method designed for fully unstructured quadrilateral ... Keywords: atmospheric modeling, dynamical core, global circulation model, parallel scalability, spectral elements

John M. Dennis; Jim Edwards; Katherine J. Evans; Oksana Guba; Peter H. Lauritzen; Arthur A. Mirin; Amik St-Cyr; Mark A. Taylor; Patrick H. Worley

2012-02-01T23:59:59.000Z

112

PiCam: an ultra-thin high performance monolithic camera array  

Science Conference Proceedings (OSTI)

We present PiCam (Pelican Imaging Camera-Array), an ultra-thin high performance monolithic camera array, that captures light fields and synthesizes high resolution images along with a range image (scene depth) through integrated parallax detection ... Keywords: array camera, computational camera, depth map, light field, parallax detection, plenoptic acquisition, superresolution

Kartik Venkataraman, Dan Lelescu, Jacques Duparré, Andrew McMahon, Gabriel Molina, Priyam Chatterjee, Robert Mullis, Shree Nayar

2013-11-01T23:59:59.000Z

113

Using CamGRID to Calculate Protein Structures from NMR Data  

E-Print Network (OSTI)

Department of Biochemistry University of Cambridge Using CamGRID to Calculate Protein Structures from NMR Data Helen Mott Structural Studies of Signalling Proteins Nuclei with spin (e.g. 1H) align (mostly) with the applied magnetic field... restraints NMR t preparation evolution detection 2D NMR t1 t2...

Mott, Helen

2011-09-09T23:59:59.000Z

114

Testing cloud microphysics parameterizations in NCAR CAM5 with ISDAC and M-PACE observations  

SciTech Connect

Arctic clouds simulated by the National Center for Atmospheric Research (NCAR) Community Atmospheric Model version 5 (CAM5) are evaluated with observations from the U.S. Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Indirect and Semi-Direct Aerosol Campaign (ISDAC) and Mixed-Phase Arctic Cloud Experiment (M-PACE), which were conducted at its North Slope of Alaska site in April 2008 and October 2004, respectively. Model forecasts for the Arctic spring and fall seasons performed under the Cloud-Associated Parameterizations Testbed framework generally reproduce the spatial distributions of cloud fraction for single-layer boundary-layer mixed-phase stratocumulus and multilayer or deep frontal clouds. However, for low-level stratocumulus, the model significantly underestimates the observed cloud liquid water content in both seasons. As a result, CAM5 significantly underestimates the surface downward longwave radiative fluxes by 20-40 W m{sup -2}. Introducing a new ice nucleation parameterization slightly improves the model performance for low-level mixed-phase clouds by increasing cloud liquid water content through the reduction of the conversion rate from cloud liquid to ice by the Wegener-Bergeron-Findeisen process. The CAM5 single-column model testing shows that changing the instantaneous freezing temperature of rain to form snow from -5 C to -40 C causes a large increase in modeled cloud liquid water content through the slowing down of cloud liquid and rain-related processes (e.g., autoconversion of cloud liquid to rain). The underestimation of aerosol concentrations in CAM5 in the Arctic also plays an important role in the low bias of cloud liquid water in the single-layer mixed-phase clouds. In addition, numerical issues related to the coupling of model physics and time stepping in CAM5 are responsible for the model biases and will be explored in future studies.

Liu X.; Lin W.; Xie, S.; Boyle, J.; Klein, S. A.; Shi, X.; Wang, Z.; Ghan, S. J.; Earle, M.; Liu, P. S. K.; Zelenyuk, A.

2011-12-24T23:59:59.000Z

115

Performance Evaluation for Modular, Scalable Overhead Cooling Systems In Data Centers  

Science Conference Proceedings (OSTI)

Scientific and enterprise data centers, IT equipment product development, and research data center laboratories typically require continuous cooling to control inlet air temperatures within recommended operating levels for the IT equipment. The consolidation and higher density aggregation of slim computing, storage and networking hardware has resulted in higher power density than what the raised-floor system design, coupled with commonly used computer rack air conditioning (CRAC) units, was originally conceived to handle. Many existing data centers and newly constructed data centers adopt CRAC units, which inherently handle heat transfer within data centers via air as the heat transfer media. This results in energy performance of the ventilation and cooling systems being less than optimal. Understanding the current trends toward higher power density in IT computing, more and more IT equipment manufacturers are designing their equipment to operate in 'conventional' data center environments, while considering provisions of alternative cooling solutions to either their equipment or supplemental cooling in rack or row systems. Naturally, the trend toward higher power density resulting from current and future generations of servers has, in the meanwhile, created significant opportunities for precision cooling suppliers to engineer and manufacture packaged modular and scalable systems. The modular and scalable cooling systems aim at significantly improving efficiency while addressing the thermal challenges, improving reliability, and allowing for future needs and growth. Such pre-engineered and manufactured systems may be a significant improvement over current design; however, without an energy efficiency focus, their applications could also lead to even lower energy efficiencies in the overall data center infrastructure. The overall goal of the project supported by California Energy Commission was to characterize four commercially available, modular cooling systems installed in a data center. Such modular cooling systems are all scalable localized units, and will be evaluated in terms of their operating energy efficiency in a real data center, respectively, as compared to the energy efficiency of traditional legacy data center cooling systems. The technical objective of this project was to evaluate the energy performance of one of the four commercially available modular cooling systems installed in a data center in Sun Microsystems, Inc. This report is the result of a test plan that was developed with the industrial participants' input, including specific design and operating characteristics of the selected modular localized cooling solution provided by vendor 1. The technical evaluation included monitoring and measurement of selected parameters, and establishing and calculating energy efficiency metrics for the selected cooling product, which is a modular, scalable overhead cooling system. The system was tested in a hot/cold aisle environment without separation, or containment or the hot or cold aisles. The scope of this report is to quantify energy performance of the modular cooling unit in operation as it corresponds to a combination of varied server loads and inlet air temperatures. The information generated from this testing when combined with a concurrent research study to document the energy efficiency of the host data center's central chilled water cooling plant can be used to estimate potential energy savings from implementing modular cooling compared to conventional cooling in data centers.

Xu, TengFang T.

2009-05-01T23:59:59.000Z

116

Dual battery system  

Science Conference Proceedings (OSTI)

A dual battery system is described, comprising: a primary first battery having a first open circuit voltage, the first battery including a first positive electrode, a first negative electrode, and a first electrolyte; a second battery having a second open circuit voltage less than the first open circuit voltage, the second battery including a second positive electrode, a second negative electrode, and a second electrolyte stored separately and isolated from the first electrolyte; a pair of positive and negative terminals; and electrical connections connecting the first and second batteries in parallel to the terminals so that, as current is drawn from the batteries, the amount of current drawn from each respective battery at a constant voltage level varies with the magnitude of the current.

Wruck, W.J.

1993-06-29T23:59:59.000Z

117

Dual Tank Fuel System  

DOE Patents (OSTI)

A dual tank fuel system has primary and secondary fuel tanks, with the primary tank including a filler pipe to receive fuel and a discharge line to deliver fuel to an engine, and with a balance pipe interconnecting the primary tank and the secondary tank. The balance pipe opens close to the bottom of each tank to direct fuel from the primary tank to the secondary tank as the primary tank is filled, and to direct fuel from the secondary tank to the primary tank as fuel is discharged from the primary tank through the discharge line. A vent line has branches connected to each tank to direct fuel vapor from the tanks as the tanks are filled, and to admit air to the tanks as fuel is delivered to the engine.

Wagner, Richard William (Albion, NY); Burkhard, James Frank (Churchville, NY); Dauer, Kenneth John (Avon, NY)

1999-11-16T23:59:59.000Z

118

Dual surface interferometer  

DOE Patents (OSTI)

A double-pass interferometer is provided which allows direct measurement of relative displacement between opposed surfaces. A conventional plane mirror interferometer may be modified by replacing the beam-measuring path cube-corner reflector with an additional quarterwave plate. The beam path is altered to extend to an opposed plane mirrored surface and the reflected beam is placed in interference with a retained reference beam split from dual-beam source and retroreflected by a reference cube-corner reflector mounted stationary with the interferometer housing. This permits direct measurement of opposed mirror surfaces by laser interferometry while doubling the resolution as with a conventional double-pass plane mirror laser interferometer system.

Pardue, R.M.; Williams, R.R.

1980-09-12T23:59:59.000Z

119

Dual surface interferometer  

DOE Patents (OSTI)

A double-pass interferometer is provided which allows direct measurement of relative displacement between opposed surfaces. A conventional plane mirror interferometer may be modified by replacing the beam-measuring path cube-corner reflector with an additional quarter-wave plate. The beam path is altered to extend to an opposed plane mirrored surface and the reflected beam is placed in interference with a retained reference beam split from dual-beam source and retroreflected by a reference cube-corner reflector mounted stationary with the interferometer housing. This permits direct measurement of opposed mirror surfaces by laser interferometry while doubling the resolution as with a conventional double-pass plane mirror laser interferometer system.

Pardue, Robert M. (Knoxville, TN); Williams, Richard R. (Oak Ridge, TN)

1982-01-01T23:59:59.000Z

120

The Mean Climate of the Community Atmosphere Model (CAM4) in Forced SST and Fully Coupled Experiments  

Science Conference Proceedings (OSTI)

The Community Atmosphere Model, version 4 (CAM4), was released as part of the Community Climate System Model, version 4 (CCSM4). The finite volume (FV) dynamical core is now the default because of its superior transport and conservation ...

Richard B. Neale; Jadwiga Richter; Sungsu Park; Peter H. Lauritzen; Stephen J. Vavrus; Philip J. Rasch; Minghua Zhang

2013-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "dual overhead cam" 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

Modeling the corrosion of high-level waste containers: CAM-CRM interface  

Science Conference Proceedings (OSTI)

A key component of the Engineered Barrier System (EBS) being designed for containment of spent-fuel and high-level waste at the proposed geological repository at Yucca Mountain, Nevada is a two-layer canister. In this particular design, the inner barrier is made of a corrosion resistant material (CRM) such as Alloy 825, 625 or C-22, while the outer barrier is made of a corrosion-allowance material (CAM) such as A516 or Monel 400. At the present time, Alloy C-22 and A516 are favored. This publication addresses the development of models to account for corrosion of Alloy C-22 surfaces exposed directly to the Near Field Environment (NFE), as well as to the exacerbated conditions in the CAM-CRM crevice.

Farmer, J. C., LLNL

1998-06-01T23:59:59.000Z

122

MegaPipe: the MegaCam image stacking pipeline at the Canadian Astronomical Data Centre  

E-Print Network (OSTI)

This paper describes the MegaPipe image processing pipeline at the Canadian Astronomical Data Centre. The pipeline combines multiple images from the MegaCam mosaic camera on CFHT and combines them into a single output image. MegaPipe takes as input detrended MegaCam images and does a careful astrometric and photometric calibration on them. The calibrated images are then resampled and combined into image stacks. The astrometric calibration of the output images is accurate to within 0.15 arcseconds relative to external reference frames and 0.04 arcseconds internally. The photometric calibration is good to within 0.03 magnitudes. The stacked images and catalogues derived from these images are available through the CADC website:

Gwyn, Stephen D J

2007-01-01T23:59:59.000Z

123

CAM/LIFTER forces and friction. Final report, September 15, 1988--November 30, 1991  

DOE Green Energy (OSTI)

This report details the procedures used to measure the cam/lifter forces and friction. The present effort employed a Cummins LTA-10, and focuses on measurements and dynamic modeling of the injector train. The program was sponsored by the US Department of Energy in support of advanced diesel engine technology. The injector train was instrumented to record the instantaneous roller speed, roller pin friction torque, pushrod force, injector link force and cam speed. These measurements, together with lift profiles for pushrod and injector link displacement, enabled the friction work loss in the injector train to be determined. Other significant design criteria such as camshaft roller follower slippage and maximum loads on components were also determined. Future efforts will concentrate on the dynamic model, with tests run as required for correlation.

Gabbey, D.J.; Lee, J.; Patterson, D.J.

1992-02-01T23:59:59.000Z

124

MegaPipe: the MegaCam image stacking pipeline at the Canadian Astronomical Data Centre  

E-Print Network (OSTI)

This paper describes the MegaPipe image processing pipeline at the Canadian Astronomical Data Centre. The pipeline combines multiple images from the MegaCam mosaic camera on CFHT and combines them into a single output image. MegaPipe takes as input detrended MegaCam images and does a careful astrometric and photometric calibration on them. The calibrated images are then resampled and combined into image stacks. The astrometric calibration of the output images is accurate to within 0.15 arcseconds relative to external reference frames and 0.04 arcseconds internally. The photometric calibration is good to within 0.03 magnitudes. The stacked images and catalogues derived from these images are available through the CADC website:

Stephen. D. J. Gwyn

2007-10-01T23:59:59.000Z

125

Dual Axis Radiographic Hydrodynamic Test Facility, IG-0599 |...  

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

Administration Other Agencies You are here Home Dual Axis Radiographic Hydrodynamic Test Facility, IG-0599 Dual Axis Radiographic Hydrodynamic Test Facility, IG-0599 The Dual...

126

UWB dual burst transmit driver  

SciTech Connect

A dual burst transmitter for ultra-wideband (UWB) communication systems generates a pair of precisely spaced RF bursts from a single trigger event. An input trigger pulse produces two oscillator trigger pulses, an initial pulse and a delayed pulse, in a dual trigger generator. The two oscillator trigger pulses drive a gated RF burst (power output) oscillator. A bias driver circuit gates the RF output oscillator on and off and sets the RF burst packet width. The bias driver also level shifts the drive signal to the level that is required for the RF output device.

Dallum, Gregory E. (Livermore, CA); Pratt, Garth C. (Discovery Bay, CA); Haugen, Peter C. (Livermore, CA); Zumstein, James M. (Livermore, CA); Vigars, Mark L. (Livermore, CA); Romero, Carlos E. (Livermore, CA)

2012-04-17T23:59:59.000Z

127

The potential for distributed generation in Japanese prototype buildings: A DER-CAM analysis of policy, tariff design, building energy use, and technology development (English Version)  

E-Print Network (OSTI)

in Japanese Prototype Buildings: A DER-CAM AnalysisPolicy, Tariff Design, Building Energy Use, and Technologyin Japanese Prototype Buildings: English Version Preface

Zhou, Nan; Marnay, Chris; Firestone, Ryan; Gao, Weijun; Nishida, Masaru

2004-01-01T23:59:59.000Z

128

The potential for distributed generation in Japanese prototype buildings: A DER-CAM analysis of policy, tariff design, building energy use, and technology development (English Version)  

E-Print Network (OSTI)

1 2. Distributed Energy Resources Customer AdoptionPublic Utilities Commission DER Distributed Energy ResourcesDER-CAM Distributed Energy Resources Customer Adoption Model

Zhou, Nan; Marnay, Chris; Firestone, Ryan; Gao, Weijun; Nishida, Masaru

2004-01-01T23:59:59.000Z

129

Testing Cloud Microphysics Parameterizations in NCAR CAM5 with ISDAC and M-PACE Observations  

SciTech Connect

Arctic clouds simulated by the NCAR Community Atmospheric Model version 5 (CAM5) are evaluated with observations from the U.S. Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Indirect and Semi-Direct Aerosol Campaign (ISDAC) and Mixed-Phase Arctic Cloud Experiment (M-PACE), which were conducted at its North Slope of Alaska site in April 2008 and October 2004, respectively. Model forecasts for the Arctic Spring and Fall seasons performed under the Cloud- Associated Parameterizations Testbed (CAPT) framework generally reproduce the spatial distributions of cloud fraction for single-layer boundary layer mixed-phase stratocumulus, and multilayer or deep frontal clouds. However, for low-level clouds, the model significantly underestimates the observed cloud liquid water content in both seasons and cloud fraction in the Spring season. As a result, CAM5 significantly underestimates the surface downward longwave (LW) radiative fluxes by 20-40 W m-2. The model with a new ice nucleation parameterization moderately improves the model simulations by increasing cloud liquid water content in mixed-phase clouds through the reduction of the conversion rate from cloud liquid to ice by the Wegener-Bergeron- Findeisen (WBF) process. The CAM5 single column model testing shows that change in the homogeneous freezing temperature of rain to form snow from -5 C to -40 C has a substantial impact on the modeled liquid water content through the slowing-down of liquid and rain-related processes. In contrast, collections of cloud ice by snow and cloud liquid by rain are of minor importance for single-layer boundary layer mixed-phase clouds in the Arctic.

Liu, Xiaohong; Xie, Shaocheng; Boyle, James; Klein, Stephen A.; Shi, Xiangjun; Wang, Zhien; Lin, Wuyin; Ghan, Steven J.; Earle, Michael; Liu, Peter; Zelenyuk, Alla

2011-12-24T23:59:59.000Z

130

Evaluating Deep Updraft Formulation in NCAR CAM3 with High-Resolution WRF Simulations During ARM TWP-ICE  

SciTech Connect

The updraft formulation used in NCAR CAM3 deep convection parameterization assumes that the fractional entrainment rate for a single updraft is height-independent and the updraft mass flux increases monotonically with height to updraft top. These assumptions are evaluated against three-dimensional high-resolution simulations from the weather research and forecast (WRF) model during the monsoon period of the DOE ARM Tropical Warm Pool -- International Cloud Experiment (TWP-ICE). Analyses of the WRF-generated updrafts suggest that the fractional entrainment rate for a single updraft decreases with height and the updraft mass flux increases with height below the top of the conditionally unstable layer but decreases above. It is suggested that the assumed updraft mass flux profile in CAM3 might be unrealistic in many cases because the updraft acceleration is affected by other drag processes in addition to entrainment. Total convective cloud mass flux and detrainment rate over the TWP-ICE domain diagnosed from the CAM3 parameterization driven by WRF meteorological fields are smaller than those derived from WRF simulations. The total entrainment rate of CAM3 is smaller than that of WRF in the lower part of cloud and larger in the upper part of cloud. Compared with WRF simulations, the CAM3-parameterized convection is too active and, as a result, excess moisture and heat may be transported to the upper troposphere by the parameterized convection. Future improvement is envisioned.

Wang, Weiguo; Liu, Xiaohong

2009-02-19T23:59:59.000Z

131

GammaCam Technology Demonstration at ORNL Buildings 3026C and 3026D  

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

Oak Ridge National Laboratory Tennessee GammaCam TM Technology Demonstration at ORNL Buildings 3026C and 3026D Challenge Buildings 3026C and 3026D at the Oak Ridge National Laboratory (ORNL) are in an advanced stage of deterioration. Rainwater damage and physical aging have reduced the structural integrity of these facilities to the point where human entry is restricted. Consequently, most activities within these facilities have ceased, including internal surveillance and maintenance. Characterization of contaminants of concern both inside and near the building is problematic. Technology is needed to remotely detect and quantify radiological contamination in facilities/spaces not fit for human entry due to physical, chemical or radiological

132

Dual function conducting polymer diodes  

DOE Patents (OSTI)

Dual function diodes based on conjugated organic polymer active layers are disclosed. When positively biased the diodes function as light emitters. When negatively biased they are highly efficient photodiodes. Methods of preparation and use of these diodes in displays and input/output devices are also disclosed.

Heeger, Alan J. (Santa Barbara, CA); Yu, Gang (Goleta, CA)

1996-01-01T23:59:59.000Z

133

Dual lookups in pattern databases  

Science Conference Proceedings (OSTI)

A pattern database (PDB) is a heuristic function stored as a lookup table. Symmetries of a state space are often used to enable multiple values to be looked up in a PDB for a given state. This paper introduces an additional PDB lookup, called the dual ...

Ariel Felner; Uzi Zahavi; Jonathan Schaeffer; Robert C. Holte

2005-07-01T23:59:59.000Z

134

Proposed Norton-Tesuque 115 kV overhead transmission line and substation in Sante Fe, New Mexico  

SciTech Connect

Construction is proposed of a 115/12.5-kilovolt (kV), 10/12.5-megavolt-ampere (MVA) substation in the Tesuque area and of 9.02 miles of 115-kV overhead transmission line from the Norton Station to the new substation in an area approximately three miles north of Sante Fe, New Mexico. The project would involve the granting of a 100-foot width right-of-way by the Tesuque Pueblo, the construction of the substation on the Tesuque Pueblo Indian Reservation between the Rio Tesuque and New Mexico 85, the addition of a 115-kV breaker bay at Norton Station, and the installation of two underground 12.47-kV distribution feeders to connect to existing ones in the Tesuque area. In addition, the station would be designed to accommodate one future underground 12.47-kV feeder that would terminate at a future distribution line in the Tesuque area. The preferred transmission line route would originate at the Norton Station and proceed east-northeast up Calabasa Arroyo to a point approximately 1.1 miles north of the southwest corner of the Tesuque Pueblo boundary. From this point the route would proceed east to the proposed substation site.

1985-06-01T23:59:59.000Z

135

Evaluation of tropical cloud and precipitation statistics of CAM3 using CloudSat and CALIPSO data  

SciTech Connect

The combined CloudSat and CALIPSO satellite observations provide the first simultaneous measurements of cloud and precipitation vertical structure, and are used to examine the representation of tropical clouds and precipitation in the Community Atmosphere Model Version 3 (CAM3). A simulator package utilizing a model-to-satellite approach facilitates comparison of model simulations to observations, and a revised clustering method is used to sort the subgrid-scale patterns of clouds and precipitation into principal cloud regimes. Results from weather forecasts performed with CAM3 suggest that the model underestimates the horizontal extent of low and mid-level clouds in subsidence regions, but overestimates that of high clouds in ascending regions. CAM3 strongly overestimates the frequency of occurrence of the deep convection with heavy precipitation regime, but underestimates the horizontal extent of clouds and precipitation at low and middle levels when this regime occurs. This suggests that the model overestimates convective precipitation and underestimates stratiform precipitation consistent with a previous study that used only precipitation observations. Tropical cloud regimes are also evaluated in a different version of the model, CAM3.5, which uses a highly entraining plume in the parameterization of deep convection. While the frequency of occurrence of the deep convection with heavy precipitation regime from CAM3.5 forecasts decreases, the incidence of the low clouds with precipitation and congestus regimes increases. As a result, the parameterization change does not reduce the frequency of precipitating convection that is far too high relative to observations. For both versions of CAM, clouds and precipitation are overly reflective at the frequency of the CloudSat radar and thin clouds that could be detected by the lidar only are underestimated.

Zhang, Y; Klein, S; Boyle, J; Mace, G G

2008-11-20T23:59:59.000Z

136

Dual Fluidized Bed Biomass Gasification  

DOE Green Energy (OSTI)

The dual fluidized bed reactor is a recirculating system in which one half of the unit operates as a steam pyrolysis device for biomass. The pyrolysis occurs by introducing biomass and steam to a hot fluidized bed of inert material such as coarse sand. Syngas is produced during the pyrolysis and exits the top of the reactor with the steam. A crossover arm, fed by gravity, moves sand and char from the pyrolyzer to the second fluidized bed. This sand bed uses blown air to combust the char. The exit stream from this side of the reactor is carbon dioxide, water and ash. There is a second gravity fed crossover arm to return sand to the pyrolysis side. The recirculating action of the sand and the char is the key to the operation of the dual fluidized bed reactor. The objective of the project was to design and construct a dual fluidized bed prototype reactor from literature information and in discussion with established experts in the field. That would be appropriate in scale and operation to measure the relative performance of the gasification of biomass and low ranked coals to produce a high quality synthesis gas with no dilution from nitrogen or combustion products.

None

2005-09-30T23:59:59.000Z

137

Simulations of Precipitation Using NRCM and Comparisons with Satellite Observations and CAM: Annual Cycle  

SciTech Connect

The accurate representation of rainfall in models of global climate has been a challenging task for climate modelers owing to its small space and time scales. Quantifying this variability is important for comparing simulations of atmospheric behavior with real time observations. In this regard, this paper compares both the statistical and dynamically forced aspects of precipitation variability simulated by the high-resolution (36 km) Nested Regional Climate Model (NRCM), with satellite observations from the Tropical Rainfall Measuring Mission (TRMM) 3B42 dataset and simulations from the Community Atmosphere Model (CAM) at T85 spatial resolution. Six years of rainfall rate data (2000-2005) from within the Tropics (30"S-30"N) have been used in the analysis and results are presented in terms of long-term mean rain rates, amplitude and phase of the annual cycle and seasonal mean maps of precipitation. Our primary focus is on characterizing the annual cycle of rainfall over four land regions of the Tropics namely, the Indian Monsoon, the Amazon, Tropical Africa and the North American monsoon. The lower tropospheric circulation patterns are analyzed in both the observations and the models to identify possible causes for biases in the simulated precipitation. The 6-year mean precipitation simulated by both models show substantial biases throughout the global Tropics with NRCM/CAM systematically underestimating/overestimating rainfall almost everywhere. The seasonal march of rainfall across the equator, following the motion of the sun, is clearly seen in the harmonic vector maps. The timing of peak rainfall (phase) produced by NRCM is in closer agreement with the observations compared to CAM. However like the longtime mean, the magnitude of seasonal mean rainfall is greatly underestimated by NRCM throughout the Tropical land mass. Some of these regional biases can be attributed to erroneous circulation and moisture surpluses/deficits in the lower troposphere in both models. Overall, the results seem to indicate that employing a higher spatial resolution (36 km) does not significantly improve simulation of precipitation. We speculate that a combination of several physics parameterizations and lack of model tuning gives rise to the observed differences between NRCM and the observations.

Murthi, Aditya; Bowman, Kenneth P.; Leung, Lai-Yung R.

2011-04-14T23:59:59.000Z

138

CHAPTER III OVERHEAD ORGANIZATION  

Science Conference Proceedings (OSTI)

... These positions frequently pay well and are political sinecures, eagerly ... of the personnel from political domination, the stimulation of applications ...

2010-03-19T23:59:59.000Z

139

Overhead Conductor Management Guide  

Science Conference Proceedings (OSTI)

As transmission systems age, utilities are increasingly concerned about the reliability of aging conductors, especially ACSR conductors, which cannot be assessed visually because of the layers of aluminum strand that cover their cores. Utilities wishing to determine how much core strength remains in these conductors can only do so by sampling the conductor and subsequently subjecting it to tensile testing or by looking at the significant circuits that pose a reliability risk using the Cormon Device or El...

2010-12-23T23:59:59.000Z

140

Simulations of Arctic Mixed-Phase Clouds in Forecasts with CAM3 and AM2 for M-PACE  

SciTech Connect

Simulations of mixed-phase clouds in short-range forecasts with the National Center for Atmospheric Research Community Atmosphere Model version 3 (CAM3) and the Geophysical Fluid Dynamics Laboratory (GFDL) climate model (AM2) for the Mixed-Phase Arctic Cloud Experiment (M-PACE) are performed under the DOE CCPP-ARM Parameterization Testbed (CAPT), which initializes the climate models with analysis data produced from numerical weather prediction (NWP) centers. It is shown that CAM3 significantly underestimates the observed boundary layer mixed-phase clouds and cannot realistically simulate the variations with temperature and cloud height of liquid water fraction in the total cloud condensate based an oversimplified cloud microphysical scheme. In contrast, AM2 reasonably reproduces the observed boundary layer clouds while its clouds contain much less cloud condensate than CAM3 and the observations. Both models underestimate the observed cloud top and base for the boundary layer clouds. The simulation of the boundary layer mixed-phase clouds and their microphysical properties is considerably improved in CAM3 when a new physically based cloud microphysical scheme is used. The new scheme also leads to an improved simulation of the surface and top of the atmosphere longwave radiative fluxes in CAM3. It is shown that the Bergeron-Findeisen process, i.e., the ice crystal growth by vapor deposition at the expense of coexisting liquid water, is important for the models to correctly simulate the characteristics of the observed microphysical properties in mixed-phase clouds. Sensitivity tests show that these results are not sensitive to the analysis data used for model initializations. Increasing model horizontal resolution helps capture the subgrid-scale features in Arctic frontal clouds but does not help improve the simulation of the single-layer boundary layer clouds. Ice crystal number density has large impact on the model simulated mixed-phase clouds and their microphysical properties and needs to be accurately represented in climate models.

Xie, Shaocheng; Boyle, James; Klein, Stephen A.; Liu, Xiaohong; Ghan, Steven J.

2008-02-29T23:59:59.000Z

Note: This page contains sample records for the topic "dual overhead cam" 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

Dual valve well pump installation  

SciTech Connect

A reciprocating electric motor-pump assembly for lifting well fluid on downstroke of the motor pump assembly, the pump including a barrel below the motor having dual combined inlet and outlet valve means at the lower end thereof, the pump piston moving in the barrel having annular grooves therearound to prevent differential pressure sticking, the electric cable supplying the electric motor being tubular to vent the pump and prevent vacuum or gas lock, there being a packer about the valve barrel separating the outlet valve means thereabove from the inlet valve means therebelow and a packer above the motor about a production tubing including an upper standing valve.

Holm, D. R.

1985-10-22T23:59:59.000Z

142

Dual Constrained Single Machine Sequencing to Minimize Total ...  

E-Print Network (OSTI)

with very little overhead (hence, the hidden constant in the big-. O notation is very .... fj+(cjk) is the slope of the line segment to the right of this point. Hence, all ...

143

Dual extragradient algorithms extended to equilibrium problems  

Science Conference Proceedings (OSTI)

In this paper we propose two iterative schemes for solving equilibrium problems which are called dual extragradient algorithms. In contrast with the primal extragradient methods in Quoc et al. (Optimization 57(6):749---776, 2008) which require ... Keywords: Complexity, Dual extragradient algorithm, Equilibrium problem, Gap function, Nash-Cournot equilibria

Tran D. Quoc; Pham N. Anh; Le D. Muu

2012-01-01T23:59:59.000Z

144

DOE Guidance-Approval Process for Dual Compensation Waivers for...  

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

Approval Process for Dual Compensation Waivers for Reemployed Annuitants DOE Guidance-Approval Process for Dual Compensation Waivers for Reemployed Annuitants Guidance Memorandum...

145

The mean climate of the Community Atmosphere Model (CAM4) in forced SST and fully coupled experiments  

SciTech Connect

The Community Atmosphere Model, version 4 (CAM4) was released as the atmosphere component of the Community Climate System Model, version 4 (CCSM4) and is described. The finite volume dynamical core available in CAM3 is now the default due to its superior transport and conservation properties. Deep convection parameterization changes include a dilute plume calculation of convective available potential energy (CAPE) and the introduction of a formulation for Convective Momentum Transport (CMT). For the cloud fraction an additional calculation is performed following macrophysical state updates that provides improved thermodynamic condistancy. A freeze-drying modification is further made to the cloud fraction calculation in very dry environments, such as arctic Winter, where cloud fractionand cloud water estimates were often inconsistant in CAM3. In CAM4 the finite volume dynamical core leads to a degradation in the excessive trade-wind simulation, but with an accompanying reduction in zonal stresses at higher latitudes. Plume dilution leads to a moister deep tropics alleviating much of the mid-tropospheric dry biases and reduces the persistant precipitation biases over the Arabian peninsular and the southern Indian ocean during the Indian Monsoon. CMT reduces much of the excessive trade-wind biases in eastern ocean basins. The freeze drying modification alleviates much of the high latitude, winter-time excessive cloud bias and improves the associated surface cloud-related energy budget, but the updated cloud macrophysical calculation generally leads to reduced cloud fraction and cloud forcing away from high latitudes. Although there are marginal improvements in time-averaged, large-scale hydrology there are signficant improvements in regional climate features such as the generation of tropical and propagation of stationary waves from the Pacific into mid-latitudes and in the seasonal frequency of Northern Hemisphere blocking events. A 1? versus 2? horizontal resolution of the finite volume 24 dynamical core exhibits signficiant improvements in model climate. Improvements in the fully coupled mean climate between CAM3 and CAM4 are also much more signficant than in forced Sea Surface Temperature (SST) simulations. Furthermore, improvements in the transient characteristics ofthe model climate, documented elsewhere, are substantial.

Neale, Richard; Richter, Jadwiga; Park, Sungsu; Lauritzen, P. H.; Vavrus, Steven J.; Rasch, Philip J.; Zhang, Minghua

2013-07-15T23:59:59.000Z

146

Response of the Wintertime Northern Hemisphere Atmospheric Circulation to Current and Projected Arctic Sea Ice Decline: A Numerical Study with CAM5  

Science Conference Proceedings (OSTI)

The wintertime Northern Hemisphere (NH) atmospheric circulation response to current (2007–12) and projected (2080–99) Arctic sea ice decline is examined with the latest version of the Community Atmospheric Model (CAM5). The numerical experiments ...

Yannick Peings; Gudrun Magnusdottir

2014-01-01T23:59:59.000Z

147

Evaluating Water Vapor in the NCAR CAM3 Climate Model with RRTMG/McICA using Modeled and Observed AIRS Spectral Radiances  

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

Water Vapor in the NCAR CAM3 Climate Model with Water Vapor in the NCAR CAM3 Climate Model with RRTMG/McICA using Modeled and Observed AIRS Spectral Radiances Michael J. Iacono, Atmospheric and Environmental Research, Inc., 131 Hartwell Avenue, Lexington, MA 02421 USA 1. Overview Objectives: * Evaluate water vapor and temperature simulation in two versions of CAM3 by comparing modeled and observed cloud-cleared AIRS spectral radiances. * Use spectral differences to verify comparisons between modeled water vapor and temperature and observed fields retrieved from AIRS radiances. Models: OSS: Optimal Spectral Sampling model developed at AER was used to simulate clear sky AIRS radiance spectra in CAM3. RRTMG/McICA: ARM-supported LW and SW radiative transfer model developed at AER for application to GCMs. RRTMG has been fully

148

Origin of the Springtime Westerly Bias in Equatorial Atlantic Surface Winds in the Community Atmosphere Model Version 3 (CAM3) Simulation  

Science Conference Proceedings (OSTI)

This study makes the case that westerly bias in the surface winds of the National Center for Atmospheric Research (NCAR) Community Atmosphere Model, version 3 (CAM3), over the equatorial Atlantic in boreal spring has its origin in the rainfall (...

Ching-Yee Chang; Sumant Nigam; James A. Carton

2008-09-01T23:59:59.000Z

149

Performance of the New NCAR CAM3.5 in East Asian Summer Monsoon Simulations: Sensitivity to Modifications of the Convection Scheme  

Science Conference Proceedings (OSTI)

The performance of an interim version of the NCAR Community Atmospheric Model (CAM3.5) in simulating the East Asian summer monsoon (EASM) is assessed by comparing model results against observations and reanalyses. Both the climate mean states and ...

Haoming Chen; Tianjun Zhou; Richard B. Neale; Xiaoqing Wu; Guang Jun Zhang

2010-07-01T23:59:59.000Z

150

Effects of Increased Horizontal Resolution on Simulation of the North American Monsoon in the NCAR CAM3: An Evaluation Based on Surface, Satellite, and Reanalysis Data  

Science Conference Proceedings (OSTI)

Simulation of the North American monsoon system by the National Center for Atmospheric Research (NCAR) Community Atmosphere Model (CAM3) is evaluated in its sensitivity to increasing horizontal resolution. For two resolutions, T42 and T85, ...

J. Craig Collier; Guang J. Zhang

2007-05-01T23:59:59.000Z

151

Mechanisms of Low Cloud–Climate Feedback in Idealized Single-Column Simulations with the Community Atmospheric Model, Version 3 (CAM3)  

Science Conference Proceedings (OSTI)

This study investigates the physical mechanism of low cloud feedback in the Community Atmospheric Model, version 3 (CAM3) through idealized single-column model (SCM) experiments over the subtropical eastern oceans. Negative cloud feedback is ...

Minghua Zhang; Christopher Bretherton

2008-09-01T23:59:59.000Z

152

Dual manifold heat pipe evaporator  

DOE Patents (OSTI)

An improved evaporator section is described for a dual manifold heat pipe. Both the upper and lower manifolds can have surfaces exposed to the heat source which evaporate the working fluid. The tubes in the tube bank between the manifolds have openings in their lower extensions into the lower manifold to provide for the transport of evaporated working fluid from the lower manifold into the tubes and from there on into the upper manifold and on to the condenser portion of the heat pipe. A wick structure lining the inner walls of the evaporator tubes extends into both the upper and lower manifolds. At least some of the tubes also have overflow tubes contained within them to carry condensed working fluid from the upper manifold to pass to the lower without spilling down the inside walls of the tubes. 1 figure.

Adkins, D.R.; Rawlinson, K.S.

1994-01-04T23:59:59.000Z

153

Quantum dynamics in dual spaces  

Science Conference Proceedings (OSTI)

Quantum mechanics gives us information about spectra of dynamical variables and transition rates including scattering cross sections. They can be exhibited as spectral information in analytically continued spaces and their duals. Quantum mechanics formulated in these generalized spaces is used to study scattering and time evolution. It is shown that the usual asymptotic condition is inadequate to deal with scattering of composite or unstable particles. Scattering theory needs amendment when the interacting system is not isospectral with the free Hamiltonian, and the amendment is formulated. Perturbation theory in generalized spaces is developed and used to study the deletion and augmentation of the spectrum of the Hamiltonian. A complete set of algebraically independent constants for an interacting system is obtained. The question of the breaking of time symmetry is discussed.

Sudarshan, E.C.G.

1993-12-31T23:59:59.000Z

154

Dual manifold heat pipe evaporator  

DOE Patents (OSTI)

An improved evaporator section for a dual manifold heat pipe. Both the upper and lower manifolds can have surfaces exposed to the heat source which evaporate the working fluid. The tubes in the tube bank between the manifolds have openings in their lower extensions into the lower manifold to provide for the transport of evaporated working fluid from the lower manifold into the tubes and from there on into the upper manifold and on to the condenser portion of the heat pipe. A wick structure lining the inner walls of the evaporator tubes extends into both the upper and lower manifolds. At least some of the tubes also have overflow tubes contained within them to carry condensed working fluid from the upper manifold to pass to the lower without spilling down the inside walls of the tubes.

Adkins, Douglas R. (Albuquerque, NM); Rawlinson, K. Scott (Albuquerque, NM)

1994-01-01T23:59:59.000Z

155

Quaternary 1T-2MTJ Cell Circuit for a High-Density and a High-Throughput Nonvolatile Bit-Serial CAM  

Science Conference Proceedings (OSTI)

A compact quaternary cell circuit using a single MOS transistor and two magnetic tunnel junction devices (1T-2MTJ) is proposed for a high-density nonvolatile bit-serial content-addressable memory (CAM). The use of quaternary CAM-cell structure makes ... Keywords: Low-Power, Compact, Spintronics, Magnetic Tunnel Junction, MTJ, MOS/MTJ-hybrid, Logic-in-Memory, Fine-Grain, Power Gating

Shoun Matsunaga; Takahiro Hanyu

2012-05-01T23:59:59.000Z

156

CamGrid: Experiences in constructing a university-wide, Condor-based grid at the University of Cambridge  

E-Print Network (OSTI)

of the available resources into two non-interacting environments, a key design goal for CamGrid is that this division should be invisible to end- users, i.e. that the end-user should not have to make a conscious decision about which environment... a single pool whose execute nodes are drawn from machines owned and managed by the UCS, and which belong to the Personal Workstation Facility (PWF). The PWF is a collection of PCs and Apple Macintosh computers...

Calleja, Mark; Beckles, B; Keegan, M; Hayes, Mark; Parker, A; Dove, Martin T

2008-06-26T23:59:59.000Z

157

Induction of neurite outgrowth through contactin and NrCAM by extracellular regions of glial receptor tyrosine phosphatase beta  

E-Print Network (OSTI)

Abstract. Receptor protein tyrosine phosphatase ? (RPTP?) is expressed as soluble and receptor forms with common extracellular regions consisting of a carbonic anhydrase domain (C), a fibronectin type III repeat (F), and a unique region called S. We showed previously that a recombinant Fc fusion protein with the C domain (?C) binds to contactin and supports neuronal adhesion and neurite growth. As a substrate, ?CFS was less effective in supporting cell adhesion, but it was a more effective promoter of neurite outgrowth than ?CF. ?S had no effect by itself, but it potentiated neurite growth when mixed with ?CF. Neurite outgrowth induced by ?CFS was inhibited by antibodies against Nr-CAM and contactin, and these cell adhesion molecules formed a complex that bound ?CFS. NIH-3T3 cells transfected to express ?CFS on their surfaces induced neuronal differentiation in culture. These results suggest that binding of glial RPTP ? to the contactin/Nr-CAM complex is important for neurite growth and neuronal differentiation. Abetter understanding of molecular mechanisms of cell–cell interactions in the nervous system is emerging from studies of neural cell adhesion molecules (CAMs) 1 and other receptors that transmit signals across the plasma membrane to control cell behavior (Edelman

Takeshi Sakurai; Marc Lustig; Moshe Nativ; John J. Hemperly; Joseph Schlessinger; Elior Peles; Martin Grumet

1997-01-01T23:59:59.000Z

158

Performance Analysis of Dual-Fan, Dual-Duct Constant Volume Air-Handling Units  

E-Print Network (OSTI)

Dual-fan, dual-duct air-handling units introduce outside air directly into the cooling duct and use two variable speed devices to independently maintain the static pressure of the hot and the cold air ducts. Analytical models have been developed to compare fan power and thermal energy consumption of dualfan, dual-duct constant volume air-handling units with single-fan, dual-duct constant volume airhandling units. This study shows that the dual-fan, dual-duct system uses less fan power and less thermal energy during winter, and uses more thermal energy during summer. Thermal energy performance can be significantly improved if the thermal energy penalty can be decreased or eliminated.

Joo, I. S.; Liu, M.

2001-01-01T23:59:59.000Z

159

Dual-Reality Objects Randall B. Smith  

E-Print Network (OSTI)

with each IUG. To move dual-reality object A into the virtual world, the IUG notifies the LOM of the RIFD that DROID and that RIFD tag value. Ownership of the object is passed directly from the originating LOM

Redmiles, David F.

160

The Synthetic Dual-Doppler Analysis Technique  

Science Conference Proceedings (OSTI)

Synthetic dual-Doppler (SDD) is a single-Doppler analysis technique that combines measurements from two different times, provided the viewing angle changes significantly. In this study, the viability of the SDD technique is investigated through ...

Brian A. Klimowski; John D. Marwitz

1992-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "dual overhead cam" 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

A single inductor dual input dual output DC-DC converter with hybrid supplies for solar energy harvesting applications  

Science Conference Proceedings (OSTI)

A single inductor dual input dual output (SIDIDO) DC-DC converter is proposed for solar energy harvesting applications. The converter supports hybrid power supplies from both the photovoltaic (PV) cells and the rechargeable battery. Apart from the conventional ... Keywords: DC-DC converter, MPPT, PV cells, dual-input-dual-output, energy harvesting, single inductor

Hui Shao; Chi-Ying Tsui; Wing-Hung Ki

2009-08-01T23:59:59.000Z

162

Dual control active superconductive devices  

DOE Patents (OSTI)

A superconducting active device has dual control inputs and is constructed such that the output of the device is effectively a linear mix of the two input signals. The device is formed of a film of superconducting material on a substrate and has two main conduction channels, each of which includes a weak link region. A first control line extends adjacent to the weak link region in the first channel and a second control line extends adjacent to the weak link region in the second channel. The current flowing from the first channel flows through an internal control line which is also adjacent to the weak link region of the second channel. The weak link regions comprise small links of superconductor, separated by voids, through which the current flows in each channel. Current passed through the control lines causes magnetic flux vortices which propagate across the weak link regions and control the resistance of these regions. The output of the device taken across the input to the main channels and the output of the second main channel and the internal control line will constitute essentially a linear mix of the two input signals imposed on the two control lines. The device is especially suited to microwave applications since it has very low input capacitance, and is well suited to being formed of high temperature superconducting materials since all of the structures may be formed coplanar with one another on a substrate.

Martens, Jon S. (Albuquerque, NM); Beyer, James B. (Madison, WI); Nordman, James E. (Madison, WI); Hohenwarter, Gert K. G. (Madison, WI)

1993-07-20T23:59:59.000Z

163

The Role of Circulation Features on Black Carbon Transport into the Arctic in the Community Atmosphere Model Version 5 (CAM5)  

SciTech Connect

Current climate models generally under-predict the surface concentration of black carbon (BC) in the Arctic due to the uncertainties associated with emissions, transport, and removal. This bias is also present in the Community Atmosphere Model Version 5.1 (CAM5). In this study, we investigate the uncertainty of Arctic BC due to transport processes simulated by CAM5 by configuring the model to run in an “offline mode” in which the large-scale circulations are prescribed. We compare the simulated BC transport when the offline model is driven by the meteorology predicted by the standard free-running CAM5 with simulations where the meteorology is constrained to agree with reanalysis products. Some circulation biases are apparent: the free-running CAM5 produces about 50% less transient eddy transport of BC than the reanalysis-driven simulations, which may be attributed to the coarse model resolution insufficient to represent eddies. Our analysis shows that the free-running CAM5 reasonably captures the essence of the Arctic Oscillation (AO), but some discernable differences in the spatial pattern of the AO between the free-running CAM5 and the reanalysis-driven simulations result in significantly different AO modulation of BC transport over Northeast Asia and Eastern Europe. Nevertheless, we find that the overall climatological circulation patterns simulated by the free-running CAM5 generally resembles those from the reanalysis products, and BC transport is very similar in both simulation sets. Therefore, the simulated circulation features regulating the long-range BC transport is unlikely the most important cause of the large under-prediction of surface BC concentration in the Arctic.

Ma, Po-Lun; Rasch, Philip J.; Wang, Hailong; Zhang, Kai; Easter, Richard C.; Tilmes, S.; Fast, Jerome D.; Liu, Xiaohong; Yoon, Jin-Ho; Lamarque, Jean-Francois

2013-05-28T23:59:59.000Z

164

Dual-K Versus Dual-T Technique for Gate Leakage Reduction: A Comparative Perspective  

Science Conference Proceedings (OSTI)

As a result of aggressive technology scaling, gate leakage (gate oxide direct tunneling) has become a major component of total power dissipation. Use of dielectrics of higher permittivity (Dual-K) or use of silicon dioxide of higher thicknesses (Dual-T ...

Saraju P. Mohanty; Ramakrishna Velagapudi; Elias Kougianos

2006-03-01T23:59:59.000Z

165

On the Second-Order Feasibility Cone: Primal-Dual Representation ...  

E-Print Network (OSTI)

and contains no lines, in which case K. ? is also regular, see Rockafellar [3]. ..... substantial expositional overhead. These matters are discussed at the end of ...

166

Dual-speed wind turbine generation  

SciTech Connect

Induction generator has been used since the early development of utility-scale wind turbine generation. An induction generator is the generator of choice because of its ruggedness and low cost. With an induction generator, the operating speed of the wind turbine is limited to a narrow range (almost constant speed). Dual- speed operation can be accomplished by using an induction generator with two different sets of winding configurations or by using a dual output drive train to drive two induction generators with two different rated speeds. With single-speed operation, the wind turbine operates at different power coefficients (Cp) as the wind speed varies. Operation at maximum Cp can occur only at a single wind speed. However, if the wind speed.varies across a wider range, the operating Cp will vary significantly. Dual-speed operation has the advantage of enabling the wind turbine to operate at near maximum Cp over a wider range of wind speeds. Thus, annual energy production can be increased. The dual-speed mode may generate less energy than a variable-speed mode; nevertheless, it offers an alternative which captures more energy than single-speed operation. In this paper, dual-speed operation of a wind turbine is investigated. Annual energy production is compared between single-speed and dual-speed operation. One type of control algorithm for dual-speed operation is proposed. Some results from a dynamic simulation will be presented to show how the control algorithm works as the wind turbine is exposed to varying wind speeds.

Muljadi, E.; Butterfield, C.P. [National Renewable Energy Lab., Golden, CO (United States); Handman, D. [Flowind Corp., San Rafael, CA (United States)

1996-10-01T23:59:59.000Z

167

Dual control active superconductive devices  

Science Conference Proceedings (OSTI)

A dual control active superconducting device is described comprising; (a) a first device having a first main conduction channel formed of a film of superconductor on a substrate, an active weak link region interposed in the first main conduction channel, the active weak link region composed of a plurality of links formed of a thin film of superconductor separated by non-superconductive voids, the thickness and lateral dimensions of the links selected such that magnetic flux can propagate across the weak link region when it is superconducting, and a first control line having a portion adjacent to the active weak link region of the first main conduction channel such that current in the first control line will impose a magnetic flux on the weak link region; (b) a second superconducting device having a second main conduction channel formed of a film of superconductor on a substrate, an active weak link region interposed in the second main conduction channel, the active weak link region composed of at least one link formed of a thin film of superconductor separated by non-superconductive voids, the thickness and lateral dimensions of the links selected such that magnetic flux can propagate across the weak link region when it is superconducting, and a second control line having a portion adjacent to the active weak link region such that current in the second control line will impose a magnetic flux on the weak link region in the second main conduction channel; (c) an internal control line electrically connected to receive the current passed through the first main conduction channel and having a portion adjacent to the active weak link region of the second main conduction channel such that a current in the internal control line will impose a magnetic flux on the weak link region; and (d) electrical connectors connected to provide input current to the first and second main conduction channels and to conduct the output current.

Martens, J.S.; Beyer, J.B.; Nordman, J.E.; Hohenwarter, G.K.G.

1993-07-20T23:59:59.000Z

168

Financing, Overhead, and Profit: An In-Depth Discussion of Costs Associated with Third-Party Financing of Residential and Commercial Photovoltaic Systems  

SciTech Connect

Previous work quantifying the non-hardware balance-of-system costs -- or soft costs -- associated with building a residential or commercial photovoltaic (PV) system has left a significant portion unsegmented in an 'other soft costs' category. This report attempts to better quantify the 'other soft costs' by focusing on the financing, overhead, and profit of residential and commercial PV installations for a specific business model. This report presents results from a bottom-up data-collection and analysis of the upfront costs associated with developing, constructing, and arranging third-party-financed residential and commercial PV systems. It quantifies the indirect corporate costs required to install distributed PV systems as well as the transactional costs associated with arranging third-party financing.

Feldman, D.; Friedman, B.; Margolis, R.

2013-10-01T23:59:59.000Z

169

Low Swing Dual Threshold Voltage Domino Logic  

E-Print Network (OSTI)

A low swing domino logic technique is proposed to decrease power consumption without sacrificing noise immunity. With the proposed low swing domino logic circuit technique, active power consumption is reduced by up to 9.4% while improving the noise immunity by 2.6% as compared to standard domino logic circuits. It is also shown that by applying a low swing contention reduction technique, the power savings can be further increased by 6.7% while the delay can be improved by 8.6%. A simple and efficient dual threshold voltage (dual-V t ) circuit technique that incorporates low swing signals is also proposed. It is shown that the proposed dual-V technique reduces the standby leakage current by approximately 235 times while offering enhanced delay characteristics as compared to a standard low threshold voltage implementation.

Volkan Kursun; Eby G. Friedman

2002-01-01T23:59:59.000Z

170

Aerosol First Indirect Effects on Non-Precipitating Low-Level Liquid Cloud Properties as Simulated by CAM5 at ARM Sites  

SciTech Connect

We quantitatively examine the aerosol first indirect effects (FIE) for non-precipitating low-level single-layer liquid phase clouds simulated by the Community Atmospheric Model version 5 (CAM5) running in the weather forecast mode at three DOE Atmospheric Radiation Measurement (ARM) sites. The FIE is quantified in terms of a relative change in cloud droplet effective radius for a relative change in aerosol accumulation mode number concentration under conditions of fixed liquid water content (LWC). CAM5 simulates aerosol-cloud interactions reasonably well for this specific cloud type, and the simulated FIE is consistent with the long-term observations at the examined locations. The FIE in CAM5 generally decreases with LWC at coastal ARM sites, and is larger by using cloud condensation nuclei rather than aerosol accumulation mode number concentration as the choice of aerosol amount. However, it has no significant variations with location and has no systematic strong seasonal variations at examined ARM sites.

Zhao, Chuanfeng; Klein, Stephen A.; Xie, Shaocheng; Liu, Xiaohong; Boyle, James; Zhang, Yuying

2012-04-28T23:59:59.000Z

171

Dual Superconductivity in G2 group  

E-Print Network (OSTI)

We investigate the dual superconductivity mechanism in the exceptional group $G_2$. This is a centerless group (no 't Hooft flux vortices are allowed) and we check for the presence of a magnetic monopole condensate in the confined phase by measuring on the lattice a disorder parameter related to the vacuum expectation value of an operator carrying magnetic charge. The behaviour of the disorder parameter is consistent with the dual superconductor picture. A first step of an analysis on the thermodynamical properties of the theory is conducted by mean of this operator.

G. Cossu; M. D'Elia; A. Di Giacomo; B. Lucini; C. Pica

2006-09-28T23:59:59.000Z

172

Complex Absorption and Reflection of a Multi-temperature Cyclotron-Bremsstrahlung X-ray Cooling Shock in BY Cam  

E-Print Network (OSTI)

We re-analyse the ASCA and GINGA X-ray data from BY Cam, a slightly asynchronous magnetic accreting white dwarf. The spectra are strongly affected by complex absorption, which we model as a continuous (power law) distribution of covering fraction and column of neutral material. This absorption causes a smooth hardening of the spectrum below 3 keV, and is probably produced by material in the preshock column which overlies the X-ray emission region. The ASCA data show that the intrinsic emission from the shock is not consistent with a single temperature plasma. Significant iron L emission co-existing with iron K shell lines from H and He-like iron clearly shows that there is a wide range of temperatures present, as expected from a cooling shock structure. The GINGA data give the best constraints on the maximum temperature emission in the shocked plasma, with kT(max)=21(+18,-4) keV. Cyclotron cooling should also be important, which supresses the highest temperature bremsstrahlung components, so the X-ray data only give a lower limit on the mass of the white dwarf of M> 0.5 solar masses. Reflection of the multi-temperature bremsstrahlung emission from the white dwarf surface is also significantly detected. We stress the importance of modelling ALL these effects in order to gain a physically self-consistent picture of the X-ray spectra from polars in general and BY Cam in particular.

C. Done; P. Magdziarz

1997-12-17T23:59:59.000Z

173

Dual-Polarization Radar Characteristics of an Apartment Fire  

Science Conference Proceedings (OSTI)

Dual-polarimetric microwave wavelength radar observations of an apartment fire in Huntsville, Alabama, on 3 March 2008 are examined to determine the radar-observable properties of ash and fire debris lofted into the atmosphere. Dual-polarimetric ...

Thomas A. Jones; Sundar A. Christopher; Walt Petersen

2009-10-01T23:59:59.000Z

174

Use of Dual-Wavelength Radar for Snow Parameter Estimates  

Science Conference Proceedings (OSTI)

Use of dual-wavelength radar, with properly chosen wavelengths, will significantly lessen the ambiguities in the retrieval of microphysical properties of hydrometeors. In this paper, a dual-wavelength algorithm is described to estimate the ...

Liang Liao; Robert Meneghini; Toshio Iguchi; Andrew Detwiler

2005-10-01T23:59:59.000Z

175

Sandia National Laboratories Dual Laser Alignment of Solar ...  

and Weather Conditions ... Dual Laser Alignment of Solar Concentrators TECHNOLOGY READINESS LEVEL Sandia estimates this technology at approximately a ...

176

The synthesis of Nano-nano dual phase  

E-Print Network (OSTI)

The synthesis of Nano-nano dual phase ceramic composites Tomas Raming #12;Raming, Tomas Peter The synthesis of nano-nano dual phase ceramic composites Thesis University of Twente, Enschede-With ref of Scientific Research (NWO), group of Chemical Sciences (CW) #12;THE SYNTHESIS OF NANO-NANO DUAL PHASE CERAMIC

Verweij, Henk

177

On dual conservation laws in planar elasticity Shaofan Li *  

E-Print Network (OSTI)

On dual conservation laws in planar elasticity Shaofan Li * Department of Civil and Environmental form 11 December 2003; accepted 30 January 2004 Abstract Dual conservation laws of linear planar generalized symmetry transformation or Lie­Backlund transformation, a class of new dual conservation laws

Li, Shaofan

178

Conditional edge-fault-tolerant Hamiltonicity of dual-cubes  

Science Conference Proceedings (OSTI)

The dual-cube is an interconnection network for linking a large number of nodes with a low node degree. It uses low-dimensional hypercubes as building blocks and keeps the main desired properties of the hypercube. A dual-cube DC(n) has n+1 links per ... Keywords: Conditional fault-tolerant, Dual-cubes, Hamiltonian cycle, Hypercube, Interconnection network

Jheng-Cheng Chen; Chang-Hsiung Tsai

2011-02-01T23:59:59.000Z

179

Binary self-dual codes with automorphisms of order 23  

Science Conference Proceedings (OSTI)

The only example of a binary doubly-even self-dual [120,60,20] code was found in 2005 by Gaborit et al. (IEEE Trans Inform theory 51, 402---407 2005). In this work we present 25 new binary doubly-even self-dual [120,60,20] ... Keywords: 94B05, Algorithms, Automorphisms, Self-dual codes

Radinka Yorgova; Alfred Wassermann

2008-08-01T23:59:59.000Z

180

Alternating Dual-Pulse, Dual-Frequency Techniques for Range and Velocity Ambiguity Mitigation on Weather Radars  

Science Conference Proceedings (OSTI)

This paper introduces a family of alternating dual-pulse, dual-frequency (ADPDF) techniques. These are based on frequency diversity and are proposed as a means to mitigate range and velocity ambiguities on Doppler weather radars. ADPDF techniques ...

Sebastián Torres; Richard Passarelli Jr.; Alan Siggia; Pentti Karhunen

2010-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "dual overhead cam" 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

Liquid Crystal Polymer-Based Planar Lumped Component Dual-Band Filters For Dual-Band WLAN Systems1  

E-Print Network (OSTI)

TH4A-2 Liquid Crystal Polymer-Based Planar Lumped Component Dual- Band Filters For Dual-Band WLAN River Street, Essex Junction, VT 05495 2 School of Electrical and Computer Engineering, Georgia

Swaminathan, Madhavan

182

Characteristics of the Vertical Profiles of Dual-Frequency, Dual-Polarization Radar Data in Stratiform Rain  

Science Conference Proceedings (OSTI)

Airborne dual-wavelength and dual-polarization radar data are analyzed for measurements taken in stratiform rain in the western Pacific during September 1990. The focus of the paper is on the vertical profiles of the linear depolarization ratio, ...

R. Meneghini; H. Kumagai

1994-06-01T23:59:59.000Z

183

CFT Duals for Extreme Black Holes  

E-Print Network (OSTI)

It is argued that the general four-dimensional extremal Kerr-Newman-AdS-dS black hole is holographically dual to a (chiral half of a) two-dimensional CFT, generalizing an argument given recently for the special case of extremal Kerr. Specifically, the asymptotic symmetries of the near-horizon region of the general extremal black hole are shown to be generated by a Virasoro algebra. Semiclassical formulae are derived for the central charge and temperature of the dual CFT as functions of the cosmological constant, Newton's constant and the black hole charges and spin. We then show, assuming the Cardy formula, that the microscopic entropy of the dual CFT precisely reproduces the macroscopic Bekenstein-Hawking area law. This CFT description becomes singular in the extreme Reissner-Nordstrom limit where the black hole has no spin. At this point a second dual CFT description is proposed in which the global part of the U(1) gauge symmetry is promoted to a Virasoro algebra. This second description is also found to re...

Hartman, Thomas; Nishioka, Tatsuma; Strominger, Andrew

2009-01-01T23:59:59.000Z

184

CFT Duals for Extreme Black Holes  

E-Print Network (OSTI)

It is argued that the general four-dimensional extremal Kerr-Newman-AdS-dS black hole is holographically dual to a (chiral half of a) two-dimensional CFT, generalizing an argument given recently for the special case of extremal Kerr. Specifically, the asymptotic symmetries of the near-horizon region of the general extremal black hole are shown to be generated by a Virasoro algebra. Semiclassical formulae are derived for the central charge and temperature of the dual CFT as functions of the cosmological constant, Newton's constant and the black hole charges and spin. We then show, assuming the Cardy formula, that the microscopic entropy of the dual CFT precisely reproduces the macroscopic Bekenstein-Hawking area law. This CFT description becomes singular in the extreme Reissner-Nordstrom limit where the black hole has no spin. At this point a second dual CFT description is proposed in which the global part of the U(1) gauge symmetry is promoted to a Virasoro algebra. This second description is also found to reproduce the area law. Various further generalizations including higher dimensions are discussed.

Thomas Hartman; Keiju Murata; Tatsuma Nishioka; Andrew Strominger

2008-11-26T23:59:59.000Z

185

Dual wakeup design for wireless sensor networks  

Science Conference Proceedings (OSTI)

Energy is often identified as the single most important resource in wireless battery-powered sensor networks. While current wakeup schemes in the literature promise to conserve energy in such networks, they apply several assumptions that may not be always ... Keywords: Cyclic block design, Dual wakeup design, Energy conservation, Lonely node, Time-tolerance sensing

Y. F. Wong; L. H. Ngoh; Winston K. G. Seah; Wai-Choong Wong

2009-01-01T23:59:59.000Z

186

Coupled dual loop absorption heat pump  

DOE Patents (OSTI)

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

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

1985-01-01T23:59:59.000Z

187

Geometric skinning with approximate dual quaternion blending  

Science Conference Proceedings (OSTI)

Skinning of skeletally deformable models is extensively used for real-time animation of characters, creatures and similar objects. The standard solution, linear blend skinning, has some serious drawbacks that require artist intervention. Therefore, a ... Keywords: Skinning, dual quaternions, linear combinations, rigid transformations, transformation blending

Ladislav Kavan; Steven Collins; Ji?í Žára; Carol O'Sullivan

2008-10-01T23:59:59.000Z

188

DUAL FACE ALGORITHM FOR LINEAR PROGRAMMING 1 ...  

E-Print Network (OSTI)

rection, the associated line search, and operations of a dual face contraction. Section ..... (ii) An index chosen to enter the nonface index set in an expansion iteration ... of B and ˜B, the kth row of B+ can be represented in terms of h (= 0), that is,.

189

Preliminary experimental investigation of a dual-band relativistic backward wave oscillator with dual beams  

Science Conference Proceedings (OSTI)

A dual-band relativistic backward wave oscillator with dual electron beams generating C-band and X-band microwaves is investigated experimentally. The frequencies, powers, and radiation patterns of the dual-band microwaves are measured. With the diode voltage of 657 kV and the total beam current of 14 kA guided by a magnetic field of about 1.7 T, the dual-band microwaves are generated with dominant frequencies of 4.58 and 8.30 GHz close to the results from the particle-in-cell simulation. The powers of the C-band and X-band microwaves are 520 and 113 MW, respectively. The effects of variations in the guiding magnetic field and diode voltage on the powers of the dual-band microwaves are presented and discussed. The radiation patterns of the dual-band microwaves from the radiating antenna are tested both corresponding to a TM{sub 01} mode and the independency of the operation processes of them is discussed.

Wang Ting; Qian Baoliang; Zhang Jiande; Zhang Xiaoping; Cao Yibing; Zhang Qiang [College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073 (China)

2011-01-15T23:59:59.000Z

190

Economizer Applications in Dual-Duct Air-Handling Units  

E-Print Network (OSTI)

This paper provides analytical tools and engineering methods to evaluate the feasibility of the economizer for dual-duct air-handling units. The results show that the economizer decreases cooling energy consumption without heating energy penalties for dual-fan, dual-duct air-handling units. The economizer has significant heating energy penalties for single-fan, dual-duct air-handling units. The penalties are higher than the cooling energy savings when the cold airflow is less than the hot airflow. Detailed engineering analyses are required to evaluate the feasibility of the economizer for single-fan, dual-duct systems.

Joo, I.; Liu, M.

2002-01-01T23:59:59.000Z

191

A Study of Response of the Equatorial Pacific SST to Doubled-CO2 Forcing in the Coupled CAM–1.5-Layer Reduced-Gravity Ocean Model  

Science Conference Proceedings (OSTI)

The response of the equatorial Pacific SST under CO2 doubling is investigated using Community Atmosphere Model, version 3.1 (CAM3.1)–1.5-layer reduced-gravity ocean (RGO) coupled model. A robust El Niño–like warming pattern is found in the ...

Fan Jia; Lixin Wu

2013-07-01T23:59:59.000Z

192

Dual Axis Radiographic Hydrodynamic Test Facility  

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

DARHT Facility: A critical component of stockpile stewardship DARHT Facility: A critical component of stockpile stewardship A new research frontier awaits! Our door is open and we thrive on mutually beneficial partnerships, collaborations that drive innovations and new technologies. April 12, 2012 Dominic Tafoya and Dave Honaberger prepare a refurbished DARHT (Dual Axis Radiographic Hydrotest Facility) 2nd axis accelerator cell for magnetic axis alignment measurements. Contact Group Leader Terry Priestley (505) 665-1330 Email Deputy Group Leader Tim Ferris (505) 665-2179 Email Hydrotests are critical in assessing nuclear weapons in nation's stockpile Dual Axis Radiographic Hydrodynamic Test facility 4:17 How DARHT Works The weapons programs at Los Alamos have one principal mission: ensure the safety, security, and effectiveness of nuclear weapons in our nation's

193

Black branes dual to striped phases  

E-Print Network (OSTI)

We construct inhomogeneous charged black branes in AdS, holographically dual to a phase at finite chemical potential with spontaneously broken translation invariance in one direction. These are obtained numerically, solving PDEs for the fully backreacted system. Fixing the periodicity scale, we find a second order phase transition to the inhomogeneous phase. We comment on the properties of the state emerging at low temperatures. For some models we demonstrate the existence of a branch of striped solutions but no continuous phase transition.

Benjamin Withers

2013-03-30T23:59:59.000Z

194

Fabrication of dual porosity electrode structure  

DOE Patents (OSTI)

A substantially entirely fibrous ceramic is described which may have dual porosity of both micro and macro pores. Total porosity may be 60-75% by volume. A method of spraying a slurry perpendicularly to an ambient stream of air is disclosed along with a method of removing binders without altering the fiber morphology. Adding fine ceramic particulates to the green ceramic fibers enhances the sintering characteristics of the fibers. 3 figures.

Smith, J.L.; Kucera, E.H.

1991-02-12T23:59:59.000Z

195

Twisted covariant noncommutative self-dual gravity  

Science Conference Proceedings (OSTI)

A twisted covariant formulation of noncommutative self-dual gravity is presented. The formulation for constructing twisted noncommutative Yang-Mills theories is used. It is shown that the noncommutative torsion is solved at any order of the {theta} expansion in terms of the tetrad and some extra fields of the theory. In the process the first order expansion in {theta} for the Plebanski action is explicitly obtained.

Estrada-Jimenez, S.; Garcia-Compean, H.; Obregon, O.; Ramirez, C. [Centro de Estudios en Fisica y Matematicas Basicas y Aplicadas, Universidad Autonoma de Chiapas, Calle 4 Oriente Norte 1428, Tuxtla Gutierrez, Chiapas (Mexico); Departamento de Fisica, Centro de Investigacion y de Estudios Avanzados del IPN, P.O. Box 14-740, 07000 Mexico D.F. (Mexico); Centro de Investigacion y de Estudios Avanzados del IPN, Unidad Monterrey, PIIT, Via del Conocimiento 201, Autopista nueva al Aeropuerto km 9.5, 66600, Apodaca Nuevo Leon (Mexico); Instituto de Fisica de la Universidad de Guanajuato, P.O. Box E-143, 37150, Leon Gto. (Mexico); Facultad de Ciencias Fisico Matematicas, Universidad Autonoma de Puebla, P.O. Box 1364, 72000, Puebla (Mexico)

2008-12-15T23:59:59.000Z

196

Fabrication of dual porosity electrode structure  

DOE Patents (OSTI)

A substantially entirely fibrous ceramic which may have dual porosity of both micro and macro pores. Total porosity may be 60-75% by volume. A method of spraying a slurry perpendicularly to an ambient stream of air is disclosed along with a method of removing binders without altering the fiber morphology. Adding fine ceramic particulates to the green ceramic fibers enhances the sintering characteristics of the fibers.

Smith, James L. (Lemont, IL); Kucera, Eugenia H. (Downers Grove, IL)

1991-01-01T23:59:59.000Z

197

Hadron physics as Seiberg dual of QCD  

SciTech Connect

We try to identify the light hadron world as the magnetic picture of QCD. We take both phenomenological and theoretical approaches to this hypothesis, and find that the interpretation seems to show interesting consistencies. In particular, one can identify the {rho} and {omega} mesons as the magnetic gauge bosons, and the Higgs mechanism for them provides a dual picture of the color confinement{sup 1}.

Kitano, Ryuichiro [Department of Physics, Tohoku University, Sendai 980-8578 (Japan)

2012-07-27T23:59:59.000Z

198

Inorganic dual-layer microporous supported membranes  

SciTech Connect

The present invention provides for a dual-layer inorganic microporous membrane capable of molecular sieving, and methods for production of the membranes. The inorganic microporous supported membrane includes a porous substrate which supports a first inorganic porous membrane having an average pore size of less than about 25 .ANG. and a second inorganic porous membrane coating the first inorganic membrane having an average pore size of less than about 6 .ANG.. The dual-layered membrane is produced by contacting the porous substrate with a surfactant-template polymeric sol, resulting in a surfactant sol coated membrane support. The surfactant sol coated membrane support is dried, producing a surfactant-templated polymer-coated substrate which is calcined to produce an intermediate layer surfactant-templated membrane. The intermediate layer surfactant-templated membrane is then contacted with a second polymeric sol producing a polymeric sol coated substrate which is dried producing an inorganic polymeric coated substrate. The inorganic polymeric coated substrate is then calcined producing an inorganic dual-layered microporous supported membrane in accordance with the present invention.

Brinker, C. Jeffrey (14 Eagle Nest Dr. NE., Albuquerque, NM 87122); Tsai, Chung-Yi (6 Mount Vernon Dr., Apt. C, Vernon, CT 06066); Lu, Yungfeng (1055 N. Capital Ave., #20, San Jose, CA 95133)

2003-03-25T23:59:59.000Z

199

New MDS or near-MDS self-dual codes  

E-Print Network (OSTI)

Abstract—We construct new MDS or near-MDS self-dual codes over large finite fields. In particular we show that there exists a Euclidean self-dual MDS code of length n = q over GF (q) whenever q = 2 m (m ? 2) using a Reed-Solomon (RS) code and its extension. It turns out that this MDS self-dual code is an extended duadic code. We construct Euclidean self-dual near-MDS codes of length n = q ? 1 over GF (q) from RS codes when q ? 1 (mod 4) and q ? 113. We also construct many new MDS self-dual codes over GF (p) of length 16 for primes 29 ? p ? 113. Finally we construct Euclidean/Hermitian self-dual MDS codes of lengths up to 14 over GF (q 2) where q = 19, 23, 25, 27, 29.

T. Aaron Gulliver; Yoonjin Lee

2008-01-01T23:59:59.000Z

200

HVDC Overhead Line Performance Study  

Science Conference Proceedings (OSTI)

The Electric Power Research Institute (EPRI) is documenting the various factors that should be considered when designing and building new high-voltage direct current (HVDC) lines or when converting AC lines to HVDC. Given the limited number of HVDC lines that have been designed and built around the world, even some basic factors (for example, insulator flashover in severely contaminated regions) are not completely understood. This report concerns a crucial first step in better understanding and improving...

2011-08-02T23:59:59.000Z

Note: This page contains sample records for the topic "dual overhead cam" 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

IPF Overhead Line Uprating Wizard  

Science Conference Proceedings (OSTI)

The Increased Power Flow (IPF) Wizard ranks various line uprating methods available on the basis of a series of relatively simple questions about the rating increase needed, the condition of the line, regulatory restrictions, and basic design parameters of the existing line. The Wizard’s knowledge base contains 17 different uprating methods selected and defined by the contractors. A series of 22 questions concerning such variables as line rating assumptions, physical condition, and permitting were define...

2009-03-17T23:59:59.000Z

202

Construction of MDS self-dual codes over Galois rings  

Science Conference Proceedings (OSTI)

The purpose of this paper is to construct nontrivial MDS self-dual codes over Galois rings. We consider a building-up construction of self-dual codes over Galois rings as a GF(q)-analogue of (Kim and Lee, J Combin Theory ser A, 105:79---95). We ... Keywords: 13H99, 94B05, Galois ring, MDS code, Self-dual code

Jon-Lark Kim; Yoonjin Lee

2007-11-01T23:59:59.000Z

203

Strongly Polynomial Primal-Dual Algorithms for Concave Cost ...  

E-Print Network (OSTI)

Feb 13, 2012 ... This technique yields a strongly polynomial primal-dual algorithm for a concave cost problem whenever such an algorithm exists for the ...

204

Approval Process for Dual Compensation Waivers for Reemployed...  

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

DIRECTOR OFFICE 0 UMAN CAPITAL MANAGEMENT SUBJECT: POLICY MEMORANDUM 11: APPROVAL PROCESS FOR DUAL COMPENSATION WAIVERS FOR REEMPLOYED ANNUITANTS Section 1122 of the National...

205

Primal-dual methods for solving infinite-dimensional games  

E-Print Network (OSTI)

(1958), 171-176. http://projecteuclid.org/euclid.pjm/1103040253. [4] Nesterov, Yurii. Primal-dual subgradient methods for convex problems. In: Mathematical.

206

DARHT: Dual-Axis Radiographic Hydrodynamic Test Facility  

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

Radiographic Hydrodynamic Test Facility DARHT: Dual-Axis Radiographic Hydrodynamic Test Facility DARHT, supports a critical component of LANL's primary mission: to ensure...

207

RATE ANALYSIS OF INEXACT DUAL FIRST ORDER METHODS ...  

E-Print Network (OSTI)

The dual problem is solved by inexact first order methods based on ..... only approximately and shows that algorithm (IDG) does not accumulate errors. However ...

208

Dual stage active magnetic regenerator and method  

DOE Patents (OSTI)

A dual stage active magnetic regenerator refrigerator as well as method using the Joule-Brayton thermodynamic cycle includes a high temperature stage refrigerant comprising DyAl{sub 2} or (Dy{sub 1{minus}x}Er{sub x})Al{sub 2} where x is selected to be greater than 0 and less than about 0.3 in combination with a low temperature stage comprising (Dy{sub 1{minus}x}Er{sub x})Al{sub 2} where x is selected to be greater than about 0.5 and less than 1 to provide significantly improved refrigeration efficiency in the liquefaction of gaseous hydrogen. 17 figs.

Pecharsky, V.K.; Gschneidner, K.A. Jr.

1999-03-30T23:59:59.000Z

209

Dual stage active magnetic regenerator and method  

DOE Patents (OSTI)

A dual stage active magnetic regenerator refrigerator as well as method using the Joule-Brayton thermodynamic cycle includes a high temperature stage refrigerant comprising DyAl.sub.2 or (Dy.sub.1-x Er.sub.x)Al.sub.2 where x is selected to be greater than 0 and less than about 0.3 in combination with a low temperature stage comprising (Dy.sub.1-x Er.sub.x)Al.sub.2 where x is selected to be greater than about 0.5 and less than 1 to provide significantly improved refrigeration efficiency in the liquefaction of gaseous hydrogen.

Pecharsky, Vitalij K. (Ames, IA); Gschneidner, Jr., Karl A. (Ames, IA)

1999-03-30T23:59:59.000Z

210

Evaluation of a New Mixed-Phase Cloud Microphysics Parameterization with CAM3 Single-Column Model and M-PACE Observations  

SciTech Connect

Most global climate models generally prescribe the partitioning of condensed water into liquid droplets and ice crystals in mixed-phase clouds according to a temperature-dependent function, which affects modeled cloud phase, cloud lifetime and radiative properties. This study evaluates a new mixed-phase cloud microphysics parameterization (for ice nucleation and water vapor deposition) against the Atmospheric Radiation Measurement (ARM) Mixed-phase Arctic Cloud Experiment (M-PACE) observations using the NCAR Community Atmospheric Model Version 3 (CAM3) single column model (SCAM). It is shown that SCAM with the new scheme produces a more realistic simulation of the cloud phase structure and the partitioning of condensed waterinto liquid droplets against observations during the M-PACE than the standard CAM. Sensitivity test indicates that ice number concentration could play an important role in the simulated mixed-phase cloud microphysics, and thereby needs to be realistically represented in global climate models.

Liu, Xiaohong; Xie, Shaocheng; Ghan, Steven J.

2007-12-14T23:59:59.000Z

211

Inexact primal-dual path-following algorithms for a special class of ...  

E-Print Network (OSTI)

line above is given by ?q+1; see [13]. The last part follows since ???˜A ..... Such a big discrepancy can be accounted for by the overhead incurred at each IPM ...

212

Evaluation of A New Mixed-Phase Cloud Microphysics Parameterization with the NCAR Climate Atmospheric Model (CAM3) and ARM Observations Fourth Quarter 2007 ARM Metric Report  

SciTech Connect

Mixed-phase clouds are composed of a mixture of cloud droplets and ice crystals. The cloud microphysics in mixed-phase clouds can significantly impact cloud optical depth, cloud radiative forcing, and cloud coverage. However, the treatment of mixed-phase clouds in most current climate models is crude and the partitioning of condensed water into liquid droplets and ice crystals is prescribed as temperature dependent functions. In our previous 2007 ARM metric reports a new mixed-phase cloud microphysics parameterization (for ice nucleation and water vapor deposition) was documented and implemented in the NCAR Community Atmospheric Model Version 3 (CAM3). The new scheme was tested against the Atmospheric Radiation Measurement (ARM) Mixed-phase Arctic Cloud Experiment (M-PACE) observations using the single column modeling and short-range weather forecast approaches. In this report this new parameterization is further tested with CAM3 in its climate simulations. It is shown that the predicted ice water content from CAM3 with the new parameterization is in better agreement with the ARM measurements at the Southern Great Plain (SGP) site for the mixed-phase clouds.

X Liu; SJ Ghan; S Xie; J Boyle; SA Klein

2007-09-30T23:59:59.000Z

213

Evaluation of Mixed-Phase Cloud Parameterizations in Short-Range Weather Forecasts with CAM3 and AM2 for Mixed-Phase Arctic Cloud Experiment  

SciTech Connect

By making use of the in-situ data collected from the recent Atmospheric Radiation Measurement Mixed-Phase Arctic Cloud Experiment, we have tested the mixed-phase cloud parameterizations used in the two major U.S. climate models, the National Center for Atmospheric Research Community Atmosphere Model version 3 (CAM3) and the Geophysical Fluid Dynamics Laboratory climate model (AM2), under both the single-column modeling framework and the U.S. Department of Energy Climate Change Prediction Program-Atmospheric Radiation Measurement Parameterization Testbed. An improved and more physically based cloud microphysical scheme for CAM3 has been also tested. The single-column modeling tests were summarized in the second quarter 2007 Atmospheric Radiation Measurement metric report. In the current report, we document the performance of these microphysical schemes in short-range weather forecasts using the Climate Chagne Prediction Program Atmospheric Radiation Measurement Parameterizaiton Testbest strategy, in which we initialize CAM3 and AM2 with realistic atmospheric states from numerical weather prediction analyses for the period when Mixed-Phase Arctic Cloud Experiment was conducted.

Xie, S; Boyle, J; Klein, S; Liu, X; Ghan, S

2007-06-01T23:59:59.000Z

214

The Gravity Dual of the Ising Model  

E-Print Network (OSTI)

We evaluate the partition function of three dimensional theories of gravity in the quantum regime, where the AdS radius is Planck scale and the central charge is of order one. The contribution from the AdS vacuum sector can - with certain assumptions - be computed and equals the vacuum character of a minimal model CFT. The torus partition function is given by a sum over geometries which is finite and computable. For generic values of Newton's constant G and the AdS radius L the result has no Hilbert space interpretation, but in certain cases it agrees with the partition function of a known CFT. For example, the partition function of pure Einstein gravity with G=3L equals that of the Ising model, providing evidence that these theories are dual. We also present somewhat weaker evidence that the 3-state and tricritical Potts models are dual to pure higher spin theories of gravity based on SL(3) and E_6, respectively.

Alejandra Castro; Matthias R. Gaberdiel; Thomas Hartman; Alexander Maloney; Roberto Volpato

2011-11-08T23:59:59.000Z

215

The Gravity Dual of the Ising Model  

E-Print Network (OSTI)

We evaluate the partition function of three dimensional theories of gravity in the quantum regime, where the AdS radius is Planck scale and the central charge is of order one. The contribution from the AdS vacuum sector can - with certain assumptions - be computed and equals the vacuum character of a minimal model CFT. The torus partition function is given by a sum over geometries which is finite and computable. For generic values of Newton's constant G and the AdS radius L the result has no Hilbert space interpretation, but in certain cases it agrees with the partition function of a known CFT. For example, the partition function of pure Einstein gravity with G=3L equals that of the Ising model, providing evidence that these theories are dual. We also present somewhat weaker evidence that the 3-state and tricritical Potts models are dual to pure higher spin theories of gravity based on SL(3) and E_6, respectively.

Castro, Alejandra; Hartman, Thomas; Maloney, Alexander; Volpato, Roberto

2011-01-01T23:59:59.000Z

216

Complex Absorption and Reflection of a Multi-temperature Cyclotron-Bremsstrahlung X-ray Cooling Shock in BY Cam  

E-Print Network (OSTI)

We re-analyse the ASCA and GINGA X-ray data from BY Cam, a slightly asynchronous magnetic accreting white dwarf. The spectra are strongly affected by complex absorption, which we model as a continuous (power law) distribution of covering fraction and column of neutral material. This absorption causes a smooth hardening of the spectrum below 3 keV, and is probably produced by material in the preshock column which overlies the X-ray emission region. The ASCA data show that the intrinsic emission from the shock is not consistent with a single temperature plasma. Significant iron L emission co-existing with iron K shell lines from H and He-like iron clearly shows that there is a wide range of temperatures present, as expected from a cooling shock structure. The GINGA data give the best constraints on the maximum temperature emission in the shocked plasma, with kT(max)=21(+18,-4) keV. Cyclotron cooling should also be important, which supresses the highest temperature bremsstrahlung components, so the X-ray data on...

Done, C

1997-01-01T23:59:59.000Z

217

An Underwater Sensor Network with Dual Communications, Sensing, and  

E-Print Network (OSTI)

An Underwater Sensor Network with Dual Communications, Sensing, and Mobility Carrick Detweiller an underwater sensor network with dual communication and sup- port for sensing and mobility. The nodes developed. We describe the hardware details of the underwater sensor node and the communication

Farritor, Shane

218

Virtual monochromatic imaging in dual-source dual-energy CT: Radiation dose and image quality  

Science Conference Proceedings (OSTI)

Purpose: To evaluate the image quality of virtual monochromatic images synthesized from dual-source dual-energy computed tomography (CT) in comparison with conventional polychromatic single-energy CT for the same radiation dose. Methods: In dual-energy CT, besides the material-specific information, one may also synthesize monochromatic images at different energies, which can be used for routine diagnosis similar to conventional polychromatic single-energy images. In this work, the authors assessed whether virtual monochromatic images generated from dual-source CT scanners had an image quality similar to that of polychromatic single-energy images for the same radiation dose. First, the authors provided a theoretical analysis of the optimal monochromatic energy for either the minimum noise level or the highest iodine contrast to noise ratio (CNR) for a given patient size and dose partitioning between the low- and high-energy scans. Second, the authors performed an experimental study on a dual-source CT scanner to evaluate the noise and iodine CNR in monochromatic images. A thoracic phantom with three sizes of attenuating rings was used to represent four adult sizes. For each phantom size, three dose partitionings between the low-energy (80 kV) and the high-energy (140 kV) scans were used in the dual-energy scan. Monochromatic images at eight energies (40 to 110 keV) were generated for each scan. Phantoms were also scanned at each of the four polychromatic single energy (80, 100, 120, and 140 kV) with the same radiation dose. Results: The optimal virtual monochromatic energy depends on several factors: phantom size, partitioning of the radiation dose between low- and high-energy scans, and the image quality metrics to be optimized. With the increase of phantom size, the optimal monochromatic energy increased. With the increased percentage of radiation dose on the low energy scan, the optimal monochromatic energy decreased. When maximizing the iodine CNR in monochromatic images, the optimal energy was lower than that when minimizing noise level. When the total radiation dose was equally distributed between low and high energy in dual-energy scans, for minimum noise, the optimal energies were 68, 71, 74, and 77 keV for small, medium, large, and extra-large (xlarge) phantoms, respectively; for maximum iodine CNR, the optimal energies were 66, 68, 70, 72 keV. With the optimal monochromatic energy, the noise level was similar to and the CNR was better than that in a single-energy scan at 120 kV for the same radiation dose. Compared to an 80 kV scan, however, the iodine CNR in monochromatic images was lower for the small, medium, and large phantoms. Conclusions: In dual-source dual-energy CT, optimal virtual monochromatic energy depends on patient size, dose partitioning, and the image quality metric optimized. With the optimal monochromatic energy, the noise level was similar to and the iodine CNR was better than that in 120 kV images for the same radiation dose. Compared to single-energy 80 kV images, the iodine CNR in virtual monochromatic images was lower for small to large phantom sizes.

Yu Lifeng; Christner, Jodie A.; Leng Shuai; Wang Jia; Fletcher, Joel G.; McCollough, Cynthia H. [Department of Radiology, Mayo Clinic, Rochester, Minnesota 55905 (United States)

2011-12-15T23:59:59.000Z

219

Nanoscale SRAM Variability and Optimization  

E-Print Network (OSTI)

area overhead required for short read bit-lines, dual word-word-line samplers contribute to a 16% array area overhead.bit-lines. Although this requires more area overhead, this

Toh, Seng Oon

2011-01-01T23:59:59.000Z

220

Metabolic complementarity and genomics of the dual bacterial symbiosis of sharpshooters  

E-Print Network (OSTI)

Metabolic Complementarity and Genomics of the Dual BacterialMetabolic complementarity and genomics of the dual bacterialthe other. ) Comparative genomics. The predicted proteomes

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "dual overhead cam" 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

Dual Rater Competency Assessment FAQ | Department of Energy  

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

Dual Rater Competency Assessment FAQ Dual Rater Competency Assessment FAQ Dual Rater Competency Assessment FAQ 1. What is the purpose of the dual rater assessments? The purpose of the dual rater competency assessment is to provide a clearer picture of the individual's developmental needs by combining self-assessment and supervisory input. Together, these two viewpoints provide a more informed assessment of individual strengths and developmental needs. Managers/supervisors and employees will be able to use competency assessment results to identify and address critical skills gaps through targeted training and development. From an organizational perspective, the competency assessment process enables organizations to assess workforce competencies and helps ensure its current workforce has the right knowledge and skills to accomplish the

222

York Electric Cooperative - Dual Fuel Heat Pump Rebate Program | Department  

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

York Electric Cooperative - Dual Fuel Heat Pump Rebate Program York Electric Cooperative - Dual Fuel Heat Pump Rebate Program York Electric Cooperative - Dual Fuel Heat Pump Rebate Program < Back Eligibility Commercial Fed. Government Industrial Local Government Nonprofit Residential State Government Savings Category Heating & Cooling Commercial Heating & Cooling Heat Pumps Maximum Rebate 2 systems per household Program Info State South Carolina Program Type Utility Rebate Program Rebate Amount Dual Fuel Heat Pumps: $400/system Provider York Electric Cooperative, Inc York Electric Cooperative, Inc. (YEC) offers a $400 rebate to members who install a dual fuel heat pump in homes or businesses. The rebates are for primary residence and/or commercial and industrial locations. The incentive is for the property owner only, meaning that renters/tenants are not

223

On Parallelizing Dual Decomposition in Stochastic Integer Programming |  

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

On Parallelizing Dual Decomposition in Stochastic Integer Programming On Parallelizing Dual Decomposition in Stochastic Integer Programming Title On Parallelizing Dual Decomposition in Stochastic Integer Programming Publication Type Journal Article Year of Publication 2013 Authors Lubin, M, Martin, K, Petra, CG, Sandikci, B Journal Operations Research Letters Volume 41 Start Page 252-258 Issue 3 Date Published 05/2013 Other Numbers ANL/MCS-P3037-0912 Abstract For stochastic mixed-integer programs, we revisit the dual decomposition algorithm of Care and Schultz from a computational perspective with the aim of its parallelization. We address an important bottleneck of parallel execution by identifying a formulation that permits the parallel solution of the master program by using structure-exploiting interior-point solvers. Our results demonstrate the potential for parallel speedup and the importance of regularization (stabilization) in the dual optimization. Load imbalance is identified as a remaining barrier to parallel scalability.

224

Dual-keel electrodynamic maglev system  

DOE Patents (OSTI)

A propulsion and stabilization system with a plurality of superconducting magnetic devices affixed to the dual-keels of a vehicle, where the superconducting magnetic devices produce a magnetic field when energized. The system also includes a plurality of figure-eight shaped null-flux coils affixed to opposing vertical sides of slots in a guideway. The figure-eight shaped null-flux coils are vertically oriented, laterally cross-connected in parallel, longitudinally connected in series, and continue the length of the vertical slots providing levitation and guidance force. An external power source energizes the figure-eight shaped null-flux coils to create a magnetic traveling wave that interacts with the magnetic field produced by the superconducting magnets to impart motion to the vehicle.

He, J.; Wang, Z.; Rote, D.M.; Coffey, H.T.; Hull, J.R.; Mulcahy, T.M.; Cai, Y.

1995-12-31T23:59:59.000Z

225

Dual power, constant speed electric motor system  

DOE Patents (OSTI)

A dual capacity permanent split capacitor electric motor system is provided with a stator having main and auxiliary windings. The main stator winding includes two winding sections which are connected in parallel with each other and across a pair of line terminals while the auxiliary winding is connected in series with a capacitor to form a circuit branch which is connected between the line terminals for operation at a first output power level. Switching means are provided to reconnect the main stator winding sections in series with each other and in series with a second capacitor to form a circuit branch which is connected between the line terminals while the stator auxiliary winding is connected directly between the line terminals for operation at a second output power level. Automatic rotation reversal occurs when the motor switches from the first to the second output power level.

Kirschbaum, Herbert S. (Asheville, NC)

1984-01-01T23:59:59.000Z

226

Dual-keel electrodynamic maglev system  

DOE Patents (OSTI)

A propulsion and stabilization system is disclosed with a plurality of superconducting magnetic devices affixed to the dual-keels of a vehicle, where the superconducting magnetic devices produce a magnetic field when energized. The system also includes a plurality of figure-eight shaped null-flux coils affixed to opposing vertical sides of slots in a guideway. The figure-eight shaped null-flux coils are vertically oriented, laterally cross-connected in parallel, longitudinally connected in series, and continue the length of the vertical slots providing levitation and guidance force. An external power source energizes the figure-eight shaped null-flux coils to create a magnetic traveling wave that interacts with the magnetic field produced by the superconducting magnets to impart motion to the vehicle. 6 figs.

He, J.L.; Wang, Z.; Rote, D.M.; Coffey, H.T.; Hull, J.R.; Mulcahy, T.M.; Cal, Y.

1996-12-24T23:59:59.000Z

227

Dual power, constant speed electric motor system  

DOE Patents (OSTI)

A dual capacity permanent split capacitor electric motor system is provided with a stator having main and auxiliary windings. The main stator winding includes two winding sections which are connected in parallel with each other and across a pair of line terminals while the auxiliary winding is connected in series with a capacitor to form a circuit branch which is connected between the line terminals for operation at a first output power level. Switching means are provided to reconnect the main stator winding sections in series with each other and in series with a second capacitor to form a circuit branch which is connected between the line terminals while the stator auxiliary winding is connected directly between the line terminals for operation at a second output power level. Automatic rotation reversal occurs when the motor switches from the first to the second output power level. 6 figs.

Kirschbaum, H.S.

1984-07-31T23:59:59.000Z

228

Dual neutral particle transmutation in CINDER2008  

Science Conference Proceedings (OSTI)

A capability has been built for the CINDER2008 (beta) transmutation code that expands the capability from only neutron induced reactions to photon induced reactions. This allows for two incident neutral particles to cause nuclear transmutation in a given material simultaneously. The CINDER2008 code, a modular rewrite of the CINDER'90 transmutation code from Los Alamos National Laboratory, was modified to allow for the dual sets of physics. A photonuclear cross section and photofission product yield library was also created using ENDF-B/VII data and translated neutron fission product yields. The code and library have been combined to create a unique transmutation code. The scope of use is broad; it is capable of modeling the transmutation caused by photons released from the decay of daughter and fission products as well as transmutation in photon rich environments. A brief code description and a verification and validation of the contributions are given. (authors)

Martin, W. J.; De Oliveira, C. R. E. [1 Univ. of New Mexico, MSC01 1120, Albuquerque, NM 87131-0001 (United States)

2012-07-01T23:59:59.000Z

229

Dual quark condensate and dressed Polyakov loops  

E-Print Network (OSTI)

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

Erek Bilgici; Falk Bruckmann; Christof Gattringer; Christian Hagen

2008-01-28T23:59:59.000Z

230

Stability of chromite interconnections in dual environments  

DOE Green Energy (OSTI)

One of the most critical technical concerns in high-temperature SOFCs is the physical, chemical, and electrical stability of the interconnect (typically a doped lanthanum chromite) in the dual (oxidizing and reducing atmosphere) SOFC environment. The reducing or fuel side may experience oxygen partial pressures (P(O{sub 2})) from 10{sup {minus}18} to 10{sup {minus}6} atmospheres, while the oxidizing side may have P(O{sub 2}) from 10{sup {minus}6} to greater than 1 atm. These conditions limit the possible candidate materials to lanthanum or yttrium chromites. In the past decade, much work has centered on development of air-sinterable chromites and understanding their physical properties; little work, however, has focused on the stability of these chromites in dual environments. Chromite powders were synthesized using the glycine-nitrate process. The powders were calcined at 1,000 C for 1 hour and then uniaxially pressed into bars (46mm x 16mm x 3mm) at 55 MPa and isostatically pressed at 138 MPa. Samples were sintered in air. The dependence of the physical properties of sintered lanthanum chromites upon ambient P(O{sub 2}) and temperature (using dilatometry, thermogravimetric analysis, and oxygen permeation measurements) were studied. La{sub 1{minus}x}A{sub x}CrO{sub 3} and Y{sub 1{minus}x}Ca{sub x}CrO{sub 3}, where A is Ca or Sr and x was varied from 0.1 to 0.4 were evaluated in this study. The P(O{sub 2}) was varied using a buffered CO{sub 2}/Ar-4%H{sub 2} gas system, enabling expansion measurements to be made over a partial pressure range from 10{sup {minus}5} to 10{sup {minus}18} atmosphere at 800, 900, and 1,000 C.

Armstrong, T.R.; Stevenson, J.W.; Raney, P.; Pederson, L.R.

1994-11-01T23:59:59.000Z

231

Dual-Layer Asymmetric Microporous Silica Membranes  

DOE Green Energy (OSTI)

We report a novel sol-gel dip-coating process to form dual-layer microporous silica membranes with improved membrane performance and reproducibility. First, we deposit a surfactant-templated silica (STS) intermediate layer on top of a commercial {gamma}-alumina support both to improve its ''surface finish'' and to prevent a subsequently deposited microporous overlayer from penetrating into the support. Second, membranes are processed under clean room conditions to avoid dust contamination and, third, membranes are vacuum-calcined to promote further pore shrinkage and impart surface hydrophobicity. The resulting asymmetric membrane exhibits a gradual change in pore diameter from 50{angstrom} ({gamma}-alumina support layer) to 10-12{angstrom} (STS intermediate layer), and then to 3-4{angstrom} (30nm thick, ultramicroporous silica top-layer). Compared to a single-layer process using only the microporous overlayer, the dual-layer process improves both flux and selectivity. For the industrially important problem of natural gas purification, the combined CO{sub 2} flux [(3{approx} 0.5) x 10{sup {minus}4} cm{sup 3}(STP)/(s{center_dot}cm{sup 2}{center_dot}cm-Hg)] and CO{sub 2}/CH{sub 4} separation factors [200{approx}600] are superior to all previously reported values for separation of a 50/50 (v/v) CO{sub 2}/CH{sub 4} gas mixture. In addition, the membrane selectively separated hydrogen from a simulated reformate from partial oxidation of methanol as evidenced by a high concentration of hydrogen recovery.

TSAI,CHUNG-YI; TAM,SIU-YUE; LU,YUNFENG; BRINKER,C. JEFFREY

1999-11-19T23:59:59.000Z

232

Sensitivity Studies of Dust Ice Nuclei Effect on Cirrus Clouds with the Community Atmosphere Model CAM5  

SciTech Connect

In this study the effect of dust aerosol on upper tropospheric cirrus clouds through heterogeneous ice nucleation is investigated in the Community Atmospheric Model version 5 (CAM5) with two ice nucleation parameterizations. Both parameterizations consider homogeneous and heterogeneous nucleation and the competition between the two mechanisms in cirrus clouds, but differ significantly in the number concentration of heterogeneous ice nuclei (IN) from dust. Heterogeneous nucleation on dust aerosol reduces the occurrence frequency of homogeneous nucleation and thus the ice crystal number concentration in the Northern Hemisphere (NH) cirrus clouds compared to simulations with pure homogeneous nucleation. Global and annual mean shortwave and longwave cloud forcing are reduced by up to 2.0 ± 0.1 W m?2 (1? uncertainty) and 2.4 ± 0.1 W m?2, respectively due to the presence of dust IN, with the net cloud forcing change of ?0.40 ± 0.20 W m?2. Comparison of model simulations with in situ aircraft data obtained in NH mid-latitudes suggests that homogeneous ice nucleation may play an important role in the ice nucleation at these regions with temperatures of 205–230 K. However, simulations overestimate observed ice crystal number concentrations in the tropical tropopause regions with temperatures of 190–205 K, and overestimate the frequency of occurrence of high ice crystal number concentration (> 200 L?1) and underestimate the frequency of low ice crystal number concentration (< 30 L?1) at NH mid-latitudes. These results highlight the importance of quantifying the number concentrations and properties of heterogeneous IN (including dust aerosol) in the upper troposphere from the global perspective.

Liu, Xiaohong; Shi, Xiangjun; Zhang, Kai; Jensen, Eric; Gettelman, A.; Barahona, Donifan; Nenes, Athanasios; Lawson, Paul

2012-12-19T23:59:59.000Z

233

Self-dual teleparallel gravity and the positive energy theorem  

E-Print Network (OSTI)

A self-dual and anti-self-dual decomposition of the teleparallel gravity is carried out and the self-dual Lagrangian of the teleparallel gravity which is equivalent to the Ashtekar Lagrangian in vacuum is obtained. Its Hamiltonian formulation and the constraint analysis are developed. Starting from Witten's equation Nester's gauge condition is derived directly and a new expression of the boundary term is obtained. Using this expression and Witten's identity the proof of the positive energy theorem by Nester et al is extended to a case including momentum.

G. Y. Chee

2004-08-16T23:59:59.000Z

234

Dual-hop LANs using station wavelength routing  

Science Conference Proceedings (OSTI)

Abstract: In future WDM local area networks, the number of available wavelengths may initially be fairly modest. As a result, spatial reuse is required in order to obtain designs which will support a reasonable number of stations. A dual-hop architecture ... Keywords: ATM buffer/switch components, WDM local area networks, all-optical approaches, buffering stage, control strategies, dual-hop LAN, dual-hop architecture, electronic implementations, hybrid electro-optic designs, local optical network, multiple wavelength sharing, optical fibre LAN, spatial reuse, station wavelength routing, system performance, traffic models, wavelength agility

1995-09-01T23:59:59.000Z

235

Dual-Mode Hybrid/Two-Mode Hybrid Accomplishment  

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

Dual-Mode Hybrid/Two-Mode Hybrid Accomplishment Dual-Mode Hybrid/Two-Mode Hybrid Accomplishment DOE-funded research, in collaboration with Allison Buses and General Motors Corporation has led to the commercialization of a dramatically different hybrid transmission system for heavy-duty and light-duty applications. The Dual-Mode or Two-Mode hybrid system is an infinitely variable speed hybrid transmission that works with the engine and battery system and automatically chooses to operate in a parallel or series hybrid path to maximize efficiency and minimize emissions, fuel consumption and noise. Parallel and Series hybrid configurations are found on most hybrid vehicles today, both with their own pluses and minuses. The Dual- Mode/Two-Mode systems uses the positive characteristics from both systems to maximize fuel

236

Mesocyclone and Microburst Signature Distortion with Dual PRT Radars  

Science Conference Proceedings (OSTI)

A simple model is used to illustrate the limitations of dual pulse repetition time (PRT) radars for measurements of wind fields with strong horizontal wind gradients. In such conditions, errors may occur even if the radial velocity measurements ...

Peter T. May

2001-07-01T23:59:59.000Z

237

DARHT: Dual-Axis Radiographic Hydrodynamic Test Facility  

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

DARHT: Dual-Axis Radiographic Hydrodynamic Test Facility DARHT: Dual-Axis Radiographic Hydrodynamic Test Facility DARHT: Dual-Axis Radiographic Hydrodynamic Test Facility DARHT, supports a critical component of LANL's primary mission: to ensure the safety, security, and effectiveness of nuclear weapons in our nation's stockpile. Los Alamos scientists built DARHT, the world's most powerful x-ray machine, to analyze mockups of nuclear weapons. At the Los Alamos National Laboratory (LANL), the Dual-Axis Radiographic Hydrodynamic Test Facility, or DARHT, supports a critical component of LANL's primary mission: to ensure the safety, security, and effectiveness of nuclear weapons in our nation's stockpile. Los Alamos scientists built DARHT, the world's most powerful x-ray machine, to analyze mockups of nuclear weapons.

238

Fusing strategies for the dual-voltage fault  

E-Print Network (OSTI)

This thesis focuses on the 42V - 14V fault in a dual voltage system and discusses the possibility of effective fusing. A simple model for the system had been created from technical documentation. Based on the model and the ...

Shrivastava, Rupam, 1981-

2005-01-01T23:59:59.000Z

239

New developments in the primal-dual column generation technique  

E-Print Network (OSTI)

Jan 24, 2011 ... Email: J.Gondzio@ed.ac.uk. †School of ... Brevis@sms.ed.ac.uk. Partially ...... Solving real-world linear ordering problems using a primal-dual.

240

A Dual-Wavelength Radar Method to Measure Snowfall Rate  

Science Conference Proceedings (OSTI)

A dual-wavelength radar method to estimate snowfall rate has been developed. The method suggests taking simultaneous and collocated reflectivity measurements at two radar wavelengths. Snowfall backscattering at one of these wavelengths should be ...

Sergey Y. Matrosov

1998-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "dual overhead cam" 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

Dual Superconductivity and Chiral Symmetry in Full QCD  

E-Print Network (OSTI)

A disorder parameter detecting dual superconductivity of the vacuum is measured across the chiral phase transition in full QCD with two flavours of dynamical staggered fermions. The observed behaviour is similar to the quenched case.

J. M. Carmona; M. D'Elia; L. Del Debbio; A. Di Giacomo; B. Lucini; G. Paffuti

2001-10-12T23:59:59.000Z

242

Dual volatility and dependence parameters and the copula  

Science Conference Proceedings (OSTI)

We introduce some new species into the zoo of stochastic volatility and dependence parameters. We start with average absolute deviation and Gini index, which are elementary volatility parameters of first and second order in spirit of dual theory of choice ...

Dieter Denneberg; Nikola Leufer

2008-08-01T23:59:59.000Z

243

Antenna Beam Patterns and Dual-Wavelength Processing  

Science Conference Proceedings (OSTI)

The detection of hail with a dual-wavelength radar system can succeed only when the two essentially independent radars used are correctly calibrated, when attenuation is correctly handled, and when the radars sample the same volume in space. The ...

Ronald E. Rinehart; John D. Tuttle

1982-12-01T23:59:59.000Z

244

INCREASED STRENGTHENING OF AUSTENITIC ALLOYS THROUGH DUAL AGING  

E-Print Network (OSTI)

d o - - -700°C after first aging at 745°C /2 hr tween) (nobJ,J". _.J__ __JI (TOTAL) AGING TIME (hr) XBL Figure 22 aALLOYS THROUGH DUAL AGING Annie Ma Inorganic Materials

Ma, Annie

2011-01-01T23:59:59.000Z

245

On the Relationship Between Dual Photography and Classical Ghost Imaging  

E-Print Network (OSTI)

Classical ghost imaging has received considerable attention in recent years because of its remarkable ability to image a scene without direct observation by a light-detecting imaging device. In this article, we show that this imaging process is actually a realization of a paradigm known as dual photography, which has been shown to produce full-color dual (ghost) images of 3D objects with complex materials without using a traditional imaging device. Specifically, we demonstrate mathematically that the cross-correlation based methods used to recover ghost images are equivalent to the light transport measurement process of dual photography. Because of this, we are able to provide a new explanation for ghost imaging using only classical optics by leveraging the principle of reciprocity in classical electromagnetics. This observation also shows how to leverage previous work on light transport acquisition and dual photography to improve ghost imaging systems in the future.

Pradeep Sen

2013-09-12T23:59:59.000Z

246

Ground Clutter Filtering Dual-Polarized, Staggered PRT Sequences  

Science Conference Proceedings (OSTI)

A procedure to filter the ground clutter from a dual-polarized, staggered pulse repetition time (PRT) sequence and recover the complex spectral coefficients of the weather signal is presented. While magnitude spectra are sufficient for estimation ...

M. Sachidananda; Dusan S. Zrnic

2006-08-01T23:59:59.000Z

247

Remote Sensing of Hail with a Dual Linear Polarization Radar  

Science Conference Proceedings (OSTI)

A technique for the remote sensing of hail with an S-band dual linear polarization radar is described. The method employs a new hail signal HDR, which is derived from disdrometer measurements of raindrop size distributions. Experimental ...

K. Aydin; T. A. Seliga; V. Balaji

1986-10-01T23:59:59.000Z

248

A Dual-Frequency Microwave Technique for Measuring Rainwater Content  

Science Conference Proceedings (OSTI)

While there are many microwave techniques for estimating the rainfall rate, there are presently few if any for accurately determining the rainwater content (W). This study shows that the dual-frequency (38, 25 GHZ) differential attenuation (A38?...

A. R. Jameson

1992-02-01T23:59:59.000Z

249

Modeling and torque estimation of an automotive dual mass flywheel  

Science Conference Proceedings (OSTI)

The Dual Mass Flywheel (DMF) is primarily used for dampening of oscillations in automotive powertrains and to prevent gearbox rattling. This paper explains the DMF mechanics along with its application and components. Afterwards a detailed ab-inltio model ...

Ulf Schaper; Oliver Sawodny; Tobias Mahl; Uli Blessing

2009-06-01T23:59:59.000Z

250

EIS-0228: Dual Axis Radiographic Hydrodynamic Test (DARHT) Facility  

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

This EIS evaluates the potential environmental impact of a proposal to construct and operate the Dual Axis Radiographic Hydrodynamic Test (DARHT) facility at Los Alamos National Laboratory (LANL)...

251

Record of Decision Dual Axis Radiographic Hydrodynamic Test Facility  

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

8:45 am BILLING CODE 6450-01-P Record of Decision Dual Axis Radiographic Hydrodynamic Test Facility AGENCY: Department of Energy. ACTION: Record of decision. SUMMARY: The...

252

Processing and Interpretation of Coherent Dual-Polarized Radar Measurements  

Science Conference Proceedings (OSTI)

Dual-polarized coherent radar measurements are used to estimate the differential propagation phase or DP between horizontal and vertical polarization states. The slope of DP is an estimate of the specific differential phase KDP. This process is ...

J. Hubbert; V. Chandrasekar; V. N. Bringi; P. Meischner

1993-04-01T23:59:59.000Z

253

HCCI Load Expansion Opportunities using a Fully Variable HVA Research Engine to Guide Development of a Production Intent Cam-based VVA Engine: The Low Load Limit  

DOE Green Energy (OSTI)

While the potential emissions and efficiency benefits of HCCI combustion are well known, realizing the potentials on a production intent engine presents numerous challenges. In this study we focus on identifying challenges and opportunities associated with a production intent cam-based variable valve actuation (VVA) system on a multi-cylinder engine in comparison to a fully flexible, naturally aspirated, hydraulic valve actuation (HVA) system on a single-cylinder engine, with both platforms sharing the same GDI fueling system and engine geometry. The multi-cylinder production intent VVA system uses a 2-step cam technology with wide authority cam phasing, allowing adjustments to be made to the negative valve overlap (NVO) duration but not the valve opening durations. On the single cylinder HVA engine, the valve opening duration and lift are variable in addition to the NVO duration. The content of this paper is limited to the low-medium operating load region at 2000rpm. Using different injection strategies, including the NVO pilot injection approach, the single-cylinder engine is operated over a load range from 160-390 kPa net IMEP at 2000 rpm. Changes to valve opening duration on the single-cylinder HVA engine illustrate opportunities for load expansion and efficiency improvement at certain conditions. For instance, the low load limit can be extended on the HVA engine by reducing breathing and operating closer to a stoichiometric air fuel ratio (AFR) by using valve deactivation. The naturally aspirated engine used here without external EGR confirmed that as operating load increases the emissions of NOx increases due to combustion temperature. NOx emissions are found to be one limitation to the maximum load limitation, the other being high pressure rise rate. It is found that the configuration of the production intent cam-based system represents a good compromise between valve lift and duration in the low to medium load region. Changing the extent of charge motion and breathing via valve deactivation prove beneficial at moderating the pressure rise rate and combustion stability and extending the low load limit at 2000rpm on the HVA engine. It also confirms that strategies using a pilot fuel injection are beneficial at low operating loads but that as operating load is increased, the benefits of multiple injection diminish to the point where a single injection offers the best performance.

Weall, Adam J [ORNL; Szybist, James P [ORNL; Edwards, Kevin Dean [ORNL; Foster, Matthew [Delphi; Confer, Keith [Delphi; Moore, Wayne [Delphi

2012-01-01T23:59:59.000Z

254

The potential for distributed generation in Japanese prototype buildings: A DER-CAM analysis of policy, tariff design, building energy use, and technology development (Japanese translation)  

DOE Green Energy (OSTI)

The August 2003 blackout of the northeastern U.S. and CANADA caused great economic losses and inconvenience to New York City and other affected areas. The blackout was a warning to the rest of the world that the ability of conventional power systems to meet growing electricity demand is questionable. Failure of large power systems can lead to serious emergencies. Introduction of on-site generation, renewable energy such as solar and wind power and the effective utilization of exhaust heat is needed, to meet the growing energy demands of the residential and commercial sectors. Additional benefit can be achieved by integrating these distributed technologies into distributed energy resource (DER) systems. This work demonstrates a method for choosing and designing economically optimal DER systems. An additional purpose of this research is to establish a database of energy tariffs, DER technology cost and performance characteristics, and building energy consumption for Japan. This research builds on prior DER studies at the Ernest Orlando Lawrence Berkeley National Laboratory (LBNL) and with their associates in the Consortium for Electric Reliability Technology Solutions (CERTS) and operation, including the development of the microgrid concept, and the DER selection optimization program, the Distributed Energy Resources Customer Adoption Model (DER-CAM). DER-CAM is a tool designed to find the optimal combination of installed equipment and an idealized operating schedule to minimize a site's energy bills, given performance and cost data on available DER technologies, utility tariffs, and site electrical and thermal loads over a test period, usually an historic year. Since hourly electric and thermal energy data are rarely available, they are typically developed by building simulation for each of six end use loads used to model the building: electric-only loads, space heating, space cooling, refrigeration, water heating, and natural-gas-only loads. DER-CAM provides a global optimization, albeit idealized, that shows how the necessary useful energy loads can be provided for at minimum cost by selection and operation of on-site generation, heat recovery, cooling, and efficiency improvements. This study examines five prototype commercial buildings and uses DER-CAM to select the economically optimal DER system for each. The five building types are office, hospital, hotel, retail, and sports facility. Each building type was considered for both 5,000 and 10,000 square meter floor sizes. The energy consumption of these building types is based on building energy simulation and published literature. Based on the optimization results, energy conservation and the emissions reduction were also evaluated. Furthermore, a comparison study between Japan and the U.S. has been conducted covering the policy, technology and the utility tariffs effects on DER systems installations.

Zhou, Nan; Marnay, Chris; Firestone, Ryan; Gao, Weijun; Nishida, Masaru

2004-10-15T23:59:59.000Z

255

HCCI Load Expansion Opportunities Using a Fully Variable HVA Research Engine to Guide Developments of a Production Intent Cam-Based VVA Engine: The Low Load Limit  

SciTech Connect

While the potential emissions and efficiency benefits of HCCI combustion are well known, realizing the potentials on a production intent engine presents numerous challenges. In this study we focus on identifying challenges and opportunities associated with a production intent cam-based variable valve actuation (VVA) system on a multi-cylinder engine in comparison to a fully flexible, naturally aspirated, hydraulic valve actuation (HVA) system on a single-cylinder engine, with both platforms sharing the same GDI fueling system and engine geometry. The multi-cylinder production intent VVA system uses a 2-step cam technology with wide authority cam phasing, allowing adjustments to be made to the negative valve overlap (NVO) duration but not the valve opening durations. On the single cylinder HVA engine, the valve opening duration and lift are variable in addition to the NVO duration. The content of this paper is limited to the low-medium operating load region at 2000rpm. Using different injection strategies, including the NVO pilot injection approach, the single-cylinder engine is operated over a load range from 160-390 kPa net IMEP at 2000 rpm. Changes to valve opening duration on the single-cylinder HVA engine illustrate opportunities for load expansion and efficiency improvement at certain conditions. For instance, the low load limit can be extended on the HVA engine by reducing breathing and operating closer to a stoichiometric air fuel ratio (AFR) by using valve deactivation. The naturally aspirated engine used here without external EGR confirmed that as operating load increases the emissions of NOx increases due to combustion temperature. NOx emissions are found to be one limitation to the maximum load limitation, the other being high pressure rise rate. It is found that the configuration of the production intent cam-based system represents a good compromise between valve lift and duration in the low to medium load region. Changing the extent of charge motion and breathing via valve deactivation prove beneficial at moderating the pressure rise rate and combustion stability and extending the low load limit at 2000rpm on the HVA engine. It also confirms that strategies using a pilot fuel injection are beneficial at low operating loads but that as operating load is increased, the benefits of multiple injection diminish to the point where a single injection offers the best performance.

Weall, Adam J [ORNL; Szybist, James P [ORNL; Edwards, Kevin Dean [ORNL; Foster, Matthew [Delphi; Confer, Keith [Delphi; Moore, Wayne [Delphi

2012-01-01T23:59:59.000Z

256

The potential for distributed generation in Japanese prototype buildings: A DER-CAM analysis of policy, tariff design, building energy use, and technology development (Japanese translation)  

SciTech Connect

The August 2003 blackout of the northeastern U.S. and CANADA caused great economic losses and inconvenience to New York City and other affected areas. The blackout was a warning to the rest of the world that the ability of conventional power systems to meet growing electricity demand is questionable. Failure of large power systems can lead to serious emergencies. Introduction of on-site generation, renewable energy such as solar and wind power and the effective utilization of exhaust heat is needed, to meet the growing energy demands of the residential and commercial sectors. Additional benefit can be achieved by integrating these distributed technologies into distributed energy resource (DER) systems. This work demonstrates a method for choosing and designing economically optimal DER systems. An additional purpose of this research is to establish a database of energy tariffs, DER technology cost and performance characteristics, and building energy consumption for Japan. This research builds on prior DER studies at the Ernest Orlando Lawrence Berkeley National Laboratory (LBNL) and with their associates in the Consortium for Electric Reliability Technology Solutions (CERTS) and operation, including the development of the microgrid concept, and the DER selection optimization program, the Distributed Energy Resources Customer Adoption Model (DER-CAM). DER-CAM is a tool designed to find the optimal combination of installed equipment and an idealized operating schedule to minimize a site's energy bills, given performance and cost data on available DER technologies, utility tariffs, and site electrical and thermal loads over a test period, usually an historic year. Since hourly electric and thermal energy data are rarely available, they are typically developed by building simulation for each of six end use loads used to model the building: electric-only loads, space heating, space cooling, refrigeration, water heating, and natural-gas-only loads. DER-CAM provides a global optimization, albeit idealized, that shows how the necessary useful energy loads can be provided for at minimum cost by selection and operation of on-site generation, heat recovery, cooling, and efficiency improvements. This study examines five prototype commercial buildings and uses DER-CAM to select the economically optimal DER system for each. The five building types are office, hospital, hotel, retail, and sports facility. Each building type was considered for both 5,000 and 10,000 square meter floor sizes. The energy consumption of these building types is based on building energy simulation and published literature. Based on the optimization results, energy conservation and the emissions reduction were also evaluated. Furthermore, a comparison study between Japan and the U.S. has been conducted covering the policy, technology and the utility tariffs effects on DER systems installations.

Zhou, Nan; Marnay, Chris; Firestone, Ryan; Gao, Weijun; Nishida, Masaru

2004-10-15T23:59:59.000Z

257

Fuel cell having dual electrode anode or cathode  

DOE Patents (OSTI)

A fuel cell that is characterized by including a dual electrode anode that is operable to simultaneously electro-oxidize a gaseous fuel and a liquid fuel. In alternative embodiments, a fuel cell having a single electrode anode is provided with a dual electrode cathode that is operable to simultaneously reduce a gaseous oxidant and a liquid oxidant to electro-oxidize a fuel supplied to the cell.

Findl, Eugene (Coram, NY)

1985-01-01T23:59:59.000Z

258

Fuel cell having dual electrode anode or cathode  

DOE Patents (OSTI)

A fuel cell that is characterized by including a dual electrode anode that is operable to simultaneously electro-oxidize a gaseous fuel and a liquid fuel. In alternative embodiments, a fuel cell having a single electrode anode is provided with a dual electrode cathode that is operable to simultaneously reduce a gaseous oxidant and a liquid oxidant to electro-oxidize a fuel supplied to the cell.

Findl, E.

1984-04-10T23:59:59.000Z

259

Dual flow--temperature--humidity control system operating manual  

SciTech Connect

The manual contains operating, maintenance, and troubleshooting procedures for a dual flow--temperature--humidity control system used at the Lawrence Livermore Laboratory to prepare test atmospheres for industrial hygiene and air pollution studies. The system consists of two basic components: a commercially available temperature/humidity indicator unit and a specially built dual flow--temperature--humidity control module that provides two air sources controlled at the same conditions of flow, temperature, and relative humidity.

Nelson, G.O.; Taylor, R.D.

1978-12-15T23:59:59.000Z

260

QCD String as Vortex String in Seiberg-Dual Theory  

E-Print Network (OSTI)

We construct a classical vortex string solution in a Seiberg-dual theory of N=1 supersymmetric SO(N_c) QCD which flows to a confining phase. We claim that this vortex string is a QCD string, as previouly argued by M.Strassler. In SO(N_c) QCD, it is known that stable QCD strings exist even in the presence of dynamical quarks. We show that our vortex strings are stable in the Seiberg-dual theory.

Eto, Minoru; Terashima, Seiji

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "dual overhead cam" 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

The Philosophy and Feasibility of Dual Readout Calorimetry  

SciTech Connect

I will discuss the general physical ideas behind dual-readout calorimetry, their implementation in DREAM (Dual REAdout Module) with exact separation of scintillation and Cerenkov light, implementation with mixed light in DREAM fibers, anticipated implementation in PbWO4 crystals with applications to the 4th Concept detector and to CMS, use in high energy gamma-ray and cosmic ray astrophysics with Cerenkov and N2 fluorescent light, and implementation in the 4th Concept detector for muon identification.

Hauptman, John [Physics, Iowa State University, Ames IA 50011 (United States)

2006-10-27T23:59:59.000Z

262

Dual excitation acoustic paramagnetic logging tool  

DOE Patents (OSTI)

New methods and apparatus are disclosed which allow measurement of the presence of oil and water in geological formations using a new physical effect called the Acoustic Paramagnetic Logging Effect (APLE). The presence of petroleum in formation causes a slight increase in the earth's magnetic field in the vicinity of the reservoir. This is the phenomena of paramagnetism. Application of an acoustic source to a geological formation at the Larmor frequency of the nucleons present causes the paramagnetism of the formation to disappear. This results in a decrease in the earth's magnetic field in the vicinity of the oil bearing formation. Repetitively frequency sweeping the acoustic source through the Larmor frequency of the nucleons present (approx. 2 kHz) causes an amplitude modulation of the earth's magnetic field which is a consequence of the APLE. The amplitude modulation of the earth's magnetic field is measured with an induction coil gradiometer and provides a direct measure of the amount of oil and water in the excitation zone of the formation. The phase of the signal is used to infer the longitudinal relaxation times of the fluids present, which results in the ability in general to separate oil and water and to measure the viscosity of the oil present. Such measurements may be performed in open boreholes and in cased well bores. The Dual Excitation Acoustic Paramagnetic Logging Tool employing two acoustic sources is also described. 6 figs.

Vail, W.B. III.

1989-02-14T23:59:59.000Z

263

Dual excitation acoustic paramagnetic logging tool  

DOE Patents (OSTI)

New methods and apparatus are disclosed which allow measurement of the presence of oil and water in gelogical formations using a new physical effect called the Acoustic Paramagnetic Logging Effect (APLE). The presence of petroleum in formation causes a slight increase in the earth's magnetic field in the vicinity of the reservoir. This is the phenomena of paramagnetism. Application of an acoustic source to a geological formation at the Larmor frequency of the nucleous present causes the paramagnetism of the formation to disappear. This results in a decrease in the earth's magnetic field in the vicinity of the oil bearing formation. Repetitively frequency sweeping the acoustic source through the Larmor frequency of the nucleons present (approx. 2 kHz) causes an amplitude modulation of the earth's magnetic field which is a consequence of the APLE. The amplitude modulation of the earth's magnetic field is measured with an induction coil gradiometer and provides a direct measure of the amount of oil and water in the excitation zone of the formation. The phase of the signal is used to infer the longitudinal relaxation times of the fluids present, which results in the ability in general to separate oil and water and to measure the viscosity of the oil present. Such measurements may be preformed in open boreholes and in cased well bores. The Dual Excitation Acoustic Paramagnetic Logging Tool employing two acoustic sources is also described.

Vail, III, William B. (Bothell, WA)

1989-01-01T23:59:59.000Z

264

Single Inductor Dual Output Buck Converter  

E-Print Network (OSTI)

The portable electronics market is rapidly migrating towards more compact devices with multiple functionalities. Form factor, performance, cost and efficiency of these devices constitute the factors of merit of devices like cell phones, MP3 players and PDA's. With advancement in technology and more intelligent processors being used, there is a need for multiple high integrity voltage supplies for empowering the systems in portable electronic devices. Switched mode power supplies (SMPS's) are used to regulate the battery voltage. In an SMPS, maximum area is taken by the passive components such as the inductor and the capacitor. This work demonstrates a single inductor used in a buck converter with two output voltages from an input battery with voltage of value 3V. The main focus areas are low cross regulation between the outputs and supply of completely independent load current levels while maintaining desired values (1.2V,1.5V) within well controlled ripple levels. Dynamic hysteresis control is used for the single inductor dual output buck converter in this work. Results of schematic and post layout simulations performed in CADENCE prove the merits of this control method, such as nil cross regulation and excellent transient response.

Eachempatti, Haritha

2009-05-01T23:59:59.000Z

265

Dual mode stereotactic localization method and application  

DOE Patents (OSTI)

The invention described herein combines the structural digital X-ray image provided by conventional stereotactic core biopsy instruments with the additional functional metabolic gamma imaging obtained with a dedicated compact gamma imaging mini-camera. Before the procedure, the patient is injected with an appropriate radiopharmaceutical. The radiopharmaceutical uptake distribution within the breast under compression in a conventional examination table expressed by the intensity of gamma emissions is obtained for comparison (co-registration) with the digital mammography (X-ray) image. This dual modality mode of operation greatly increases the functionality of existing stereotactic biopsy devices by yielding a much smaller number of false positives than would be produced using X-ray images alone. The ability to obtain both the X-ray mammographic image and the nuclear-based medicine gamma image using a single device is made possible largely through the use of a novel, small and movable gamma imaging camera that permits its incorporation into the same table or system as that currently utilized to obtain X-ray based mammographic images for localization of lesions.

Keppel, Cynthia E. (Norfolk, VA); Barbosa, Fernando Jorge (Newport News, VA); Majewski, Stanislaw (Grafton, VA)

2002-01-01T23:59:59.000Z

266

Dual Mode Inverter Control Test Verification  

SciTech Connect

Permanent Magnet Motors with either sinusoidal back emf (permanent magnet synchronous motor [PMSM]) or trapezoidal back emf (brushless dc motor [BDCM]) do not have the ability to alter the air gap flux density (field weakening). Since the back emf increases with speed, the system must be designed to operate with the voltage obtained at its highest speed. Oak Ridge National Laboratory's (ORNL) Power Electronics and Electric Machinery Research Center (PEEMRC) has developed a dual mode inverter controller (DMIC) that overcomes this disadvantage. This report summarizes the results of tests to verify its operation. The standard PEEMRC 75 kW hard-switched inverter was modified to implement the field weakening procedure (silicon controlled rectifier enabled phase advance). A 49.5 hp motor rated at 2800 rpm was derated to a base of 400 rpm and 7.5 hp. The load developed by a Kahn Industries hydraulic dynamometer, was measured with a MCRT9-02TS Himmelstein and Company torque meter. At the base conditions a current of 212 amperes produced the 7.5 hp. Tests were run at 400, 1215, and 2424 rpm. In each run, the current was no greater than 214 amperes. The horsepower obtained in the three runs were 7.5, 9.3, and 8.12. These results verified the basic operation of the DMIC in producing a Constant Power Speed Ratios (CPSR) of six.

Bailey, J.M.

2001-04-25T23:59:59.000Z

267

DEIS_Cam_Cover  

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

Cameron LNG, LLC Cameron Interstate Pipeline, LLC Cooperating Agencies: U.S. Army Corps of Engineers U.S. Coast Guard U.S. Department of Energy U.S. Department of Transportation...

268

Uncertainty Quantification and Parameter Tuning in the CAM5 Zhang-McFarlane Convection Scheme and Impact of Improved Convection on the Global Circulation and Climate  

SciTech Connect

In this study, we applied an uncertainty quantification (UQ) technique to improve convective precipitation in the global climate model, the Community Atmosphere Model version 5 (CAM5), in which the convective and stratiform precipitation partitioning is very different from observational estimates. We examined the sensitivity of precipitation and circulation to several key parameters in the Zhang-McFarlane deep convection scheme in CAM5, using a stochastic importance-sampling algorithm that can progressively converge to optimal parameter values. The impact of improved deep convection on the global circulation and climate was subsequently evaluated. Our results show that the simulated convective precipitation is most sensitive to the parameters of the convective available potential energy consumption time scale, parcel fractional mass entrainment rate, and maximum downdraft mass flux fraction. Using the optimal parameters constrained by the observed Tropical Rainfall Measuring Mission, convective precipitation improves the simulation of convective to stratiform precipitation ratio and rain-rate spectrum remarkably. When convection is suppressed, precipitation tends to be more confined to the regions with strong atmospheric convergence. As the optimal parameters are used, positive impacts on some aspects of the atmospheric circulation and climate, including reduction of the double Intertropical Convergence Zone, improved East Asian monsoon precipitation, and improved annual cycles of the cross-equatorial jets, are found as a result of the vertical and horizontal redistribution of latent heat release from the revised parameterization. Positive impacts of the optimal parameters derived from the 2 simulations are found to transfer to the 1 simulations to some extent.

Yang, Ben; Qian, Yun; Lin, Guang; Leung, Lai-Yung R.; Rasch, Philip J.; Zhang, Guang J.; McFarlane, Sally A.; Zhao, Chun; Zhang, Yaocun; Wang, Hailong; Wang, Minghuai; Liu, Xiaohong

2013-01-25T23:59:59.000Z

269

Dynamic simulation of dual-speed wind turbine generation  

SciTech Connect

Induction generators have been used since the early development of utility-scale wind turbine generation. An induction generator is the generator of choice because of its ruggedness, and low cost. With an induction generator, the operating speed of the wind turbine is limited to a narrow range (almost constant speed). Dual- speed operation can be accomplished by using an induction generator with two different sets of winding configurations or by using two induction generators with two different rated speeds. With single- speed operation, the wind turbine operates at different power coefficients (Cp) as the wind speed varies. The operation at maximum Cp can occur only at a single wind speed. However, if the wind speed varies across a wider range, the operating Cp will vary significantly. Dual-speed operation has the advantage of enabling the wind turbine to operate at near maximum Cp over a wider range of wind-speeds. Thus, annual energy production can be increased. The dual-speed mode may generate less energy than a variable-speed mode; nevertheless, it offers an alternative to capture more energy than single-speed operation. In this paper, dual-speed operation of a wind turbine will be investigated. One type of control algorithm for dual- speed operation is proposed. Results from a dynamic simulation will be presented to show how the control algorithm works and how power, current and torque of the system vary as the wind turbine is exposed to varying wind speeds.

Muljadi, E.; Butterfield, C.P.

1996-10-01T23:59:59.000Z

270

Toward a Minimal Representation of Aerosols in Climate Models: Description and Evaluation in the Community Atmosphere Model CAM5  

Science Conference Proceedings (OSTI)

A modal aerosol module (MAM) has been developed for the Community Atmosphere Model version 5 (CAM5), the atmospheric component of the Community Earth System Model version 1 (CESM1). MAM is capable of simulating the aerosol size distribution and both internal and external mixing between aerosol components, treating numerous complicated aerosol processes and aerosol physical, chemical and optical properties in a physically based manner. Two MAM versions were developed: a more complete version with seven-lognormal modes (MAM7), and a three-lognormal mode version (MAM3) for the purpose of long-term (decades to centuries) simulations. Major approximations in MAM3 include assuming immediate mixing of primary organic matter (POM) and black carbon (BC) with other aerosol components, merging of the MAM7 fine dust and fine sea salt modes into the accumulation mode, merging of the MAM7 coarse dust and coarse sea salt modes into the single coarse mode, and neglecting the explicit treatment of ammonia and ammonium cycles. Simulated sulfate and secondary organic aerosol (SOA) mass concentrations are remarkably similar between MAM3 and MAM7 as most ({approx}90%) of these aerosol species are in the accumulation mode. Differences of POM and BC concentrations between MAM3 and MAM7 are also small (mostly within 10%) because of the assumed hygroscopic nature of POM, so that freshly emitted POM and BC are wet-removed before mixing internally with soluble aerosol species. Sensitivity tests with the POM assumed to be hydrophobic and with slower aging process increase the POM and BC concentrations, especially at high latitudes (by several times). The mineral dust global burden differs by 10% and sea salt burden by 30-40% between MAM3 and MAM7 mainly due to the different size ranges for dust and sea salt modes and different standard deviations of log-normal size distribution for sea salt modes between MAM3 and MAM7. The model is able to qualitatively capture the observed geographical and temporal variations of aerosol mass and number concentrations, size distributions, and aerosol optical properties. However, there are noticeable biases, e.g., simulated sulfate and mineral dust concentrations at surface over the oceans are too low. Simulated BC concentrations are significant low in the Arctic. There is a low bias in modeled aerosol optical depth on the global scale, especially in the developing counties. There biases in aerosol simulations clearly indicate the need for improvements of aerosol processes (e.g., emission fluxes of anthropogenic aerosols and precursor gases in developing countries, boundary layer nucleation) and properties (e.g., primary aerosol emission size, POM hygroscopicity). In addition the critical role of cloud properties (e.g., liquid water content, cloud fraction) responsible for the wet scavenging of aerosol is highlighted.

Liu, Xiaohong; Easter, Richard C.; Ghan, Steven J.; Zaveri, Rahul A.; Rasch, Philip J.; Shi, Xiangjun; Lamarque, J.-F.; Gettelman, A.; Morrison, H.; Vitt, Francis; Conley, Andrew; Park, S.; Neale, Richard; Hannay, Cecile; Ekman, A. M.; Hess, Peter; Mahowald, N.; Collins, William D.; Iacono, Michael J.; Bretherton, Christopher S.; Flanner, M. G.; Mitchell, David

2012-05-21T23:59:59.000Z

271

ROCKY MOUNTAIN OILFIELD TESTING CENTER Texaco Dual Action Pumping System  

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

Texaco Dual Action Pumping System Texaco Dual Action Pumping System PROJECT TEST RESULTS March 16, 1998 Michael R. Tyler Project Manager Abstract The Texaco Dual Action Pumping System (DAPS) is designed to separate water from the oil in the casing-tubing annulas and inject most of the water into a lower formation while lifting the oil and remaining water to the surface. As oil production declines in a well the water production can increase. The lifting cost can be reduced per barrel of oil if less water is brought to the surface and processed. The DAPS was installed in a well that had been producing four (4) barrels of oil per day (bopd) and 46 barrels of water per day (bwpd), from the zone that became the injection zone. The well was recompleted in a shallower zone that was expected to yield an excessive quantity of

272

Dual-environment effects on the oxidation of metallic interconnects  

DOE Green Energy (OSTI)

Metallic interconnects in solid oxide fuel cells are exposed to a dual environment: fuel on one side (i.e., H2 gas) and oxidizer on the other side (i.e., air). It has been observed that the oxidation behavior of thin stainless steel sheet in air is changed by the presence of H2 on the other side of the sheet. The resulting dual-environment scales are flaky and more friable than the single-environment scales. The H2 disrupts the scale on the air side. A model to explain some of the effects of a dual environment is presented where hydrogen diffusing through the stainless steel sheet reacts with oxygen diffusing through the scale to form water vapor, which has sufficient vapor pressure to mechanically disrupt the scale. Experiments on preoxidized 316L stainless steel tubing exposed to air-air, H2-air, and H2-Ar environments are reported in support of the model.

Holcomb, G.R.; Ziomek-Moroz, M.; Covino, B.S., Jr.; Bullard, S.J.

2006-08-01T23:59:59.000Z

273

Approval Process for Dual Compensation Waivers for Reemployed Annuitants  

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

10 10 MEMORANDUM FOR HUMAN RESOURCE DIRECTORS ~~~ - FROM: SARAH J. NILLA, DIRECTOR OFFICE 0 UMAN CAPITAL MANAGEMENT SUBJECT: POLICY MEMORANDUM # 11: APPROVAL PROCESS FOR DUAL COMPENSATION WAIVERS FOR REEMPLOYED ANNUITANTS Section 1122 of the National Defense Authorization Act for Fiscal Year 2010, Public Law 111-84 (Pub. L 111-84) allows the head of an agency to grant dual compensation (salary-offset) waivers to reemployed annuitants who work on a limited basis without reduction to their retirement annuity. This provision in the law expires October 27, 2014. Secretary Chu has delegated the authority to approve all dual compensation waiver requests to the Department's Chief Human Capital Officer (CHCO). This authority can be used to: a) Fulfill functions critical to the mission of the agency (or any subcomponent of

274

Dual-Fuel Truck Fleet: Start-Up Experience  

DOE Green Energy (OSTI)

Although dual-fuel engine technology has been in development and limited use for several years, it has only recently moved toward full-scale operational capability for heavy-duty truck applications. Unlike a bifuel engine, which has two separate fuel systems that are used one at a time, a dual-fuel engine uses two fuel systems simultaneously. One of California's South Coast Air Quality Management District (SCAQMD) current programs is a demonstration of dual-fuel engine technology in heavy-duty trucks. These trucks are being studied as part of the National Renewable Energy Laboratory's (NREL's) Alternative Fuel Truck Program. This report describes the start-up experience from the program.

NREL

1998-09-30T23:59:59.000Z

275

Mode Competition in Dual-Mode Quantum Dots Semiconductor Microlaser  

E-Print Network (OSTI)

This paper describes the modeling of quantum dots lasers with the aim of assessing the conditions for stable cw dual-mode operation when the mode separation lies in the THz range. Several possible models suited for InAs quantum dots in InP barriers are analytically evaluated, in particular quantum dots electrically coupled through a direct exchange of excitation by the wetting layer or quantum dots optically coupled through the homogeneous broadening of their optical gain. A stable dual-mode regime is shown possible in all cases when quantum dots are used as active layer whereas a gain medium of quantum well or bulk type inevitably leads to bistable behavior. The choice of a quantum dots gain medium perfectly matched the production of dual-mode lasers devoted to THz generation by photomixing.

Chusseau, Laurent; Viktorovitch, P; Letartre, Xavier

2013-01-01T23:59:59.000Z

276

Development of PC 4 dual-fuel engine  

SciTech Connect

Recently, utilization of natural gas, which is considered to be one of most important alternative fuels for petroleum, has been marked. As thermal efficiency of dual-fuel engine is higher than those of other prime movers with gaseous fuel, i.e., spark-ignited gas engine or gas turbine, it is possible to construct fuel-economical gas power plants with dual-fuel engines. However, its horsepower has been limited to the rather lower range. In 1984, NKK succeeded in developing large-sized dual-fuel engines based on the Pielstick PC4 diesel engine. The horsepower is 1200 HP/cyl, i.e. 21,600 HP for 18-cyclinder engine.

Nishikawa, T.; Utsuyama, S.; Maruyama, S.; Ono, T.; Kitahara, S.

1985-01-01T23:59:59.000Z

277

Using dual decomposition for solving problems involving data uncertainty |  

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

dual decomposition for solving problems involving data uncertainty dual decomposition for solving problems involving data uncertainty August 14, 2013 Tweet EmailPrint Many applications mdash; energy, routing, scheduling, and production planning, for example mdash; involve problems in which some or all of the data may not be known when decisions under uncertainty must be made. In such cases, approximations with stochastic mixed-integer programming models are often used. Two approaches have been suggested to address such problems: dual decomposition (DD) and branch-and-price (BP). Both approaches divide the problem into two or more subproblems, together with linear constraints that enforce agreement between solutions to the different problems through a series of iterations. Unfortunately, both approaches also suffer from lack

278

Evaluation of liquid lift approach to dual gradient drilling  

E-Print Network (OSTI)

In the past, the oil and gas industry has typically used the single gradient system to drill wells offshore. With this system the bottom hole pressure was controlled by a mud column extending from the drilling rig to the bottom of the wellbore. This mud column was used to achieve the required bottom hole pressure. But, as the demand for oil and gas increased, the industry started exploring for oil and gas in deep waters. Because of the narrow margin between the pore and fracture pressures it is somewhat difficult to reach total depth with the single gradient system. This led to the invention of the dual gradient system. In the dual gradient method, heavy density fluid runs from the bottom hole to the mudline and a low density fluid from the mudline to the rig floor so as to maintain the bottom hole pressure. Several methods have been developed to achieve the dual gradient drilling principle. For this research project, we paid more attention to the liquid lift, dual gradient drilling (riser dilution method). This method of achieving dual gradient drilling was somewhat different from the others, because it does not utilize elaborate equipment and no major changes are made on the existing drilling rigs. In this thesis the technical feasibility of using the liquid lift method over the other methods of achieving dual gradient drilling was determined. A computer program was developed to simulate the wellbore hydraulics under static and dynamic conditions, injection rate and base fluid density required to dilute the riser fluid and finally, u-tubing phenomena. In this thesis we also identified some problems associated with the liquid lift method and recommendations were made on how these problems can be eliminated or reduced. Emphases were placed on the effect of u-tubing, injection rate of base fluid at the bottom of the riser and well control issues facing this system.

Okafor, Ugochukwu Nnamdi

2007-12-01T23:59:59.000Z

279

Evaluation of liquid lift approach to dual gradient  

E-Print Network (OSTI)

In the past, the oil and gas industry has typically used the single gradient system to drill wells offshore. With this system the bottom hole pressure was controlled by a mud column extending from the drilling rig to the bottom of the wellbore. This mud column was used to achieve the required bottom hole pressure. But, as the demand for oil and gas increased, the industry started exploring for oil and gas in deep waters. Because of the narrow margin between the pore and fracture pressures it is somewhat difficult to reach total depth with the single gradient system. This led to the invention of the dual gradient system. In the dual gradient method, heavy density fluid runs from the bottom hole to the mudline and a low density fluid from the mudline to the rig floor so as to maintain the bottom hole pressure. Several methods have been developed to achieve the dual gradient drilling principle. For this research project, we paid more attention to the liquid lift, dual gradient drilling (riser dilution method). This method of achieving dual gradient drilling was somewhat different from the others, because it does not utilize elaborate equipment and no major changes are made on the existing drilling rigs. In this thesis the technical feasibility of using the liquid lift method over the other methods of achieving dual gradient drilling was determined. A computer program was developed to simulate the wellbore hydraulics under static and dynamic conditions, injection rate and base fluid density required to dilute the riser fluid and finally, u-tubing phenomena. In this thesis we also identified some problems associated with the liquid lift method and recommendations were made on how these problems can be eliminated or reduced. Emphases were placed on the effect of u-tubing, injection rate of base fluid at the bottom of the riser and well control issues facing this system.

Okafor, Ugochukwu Nnamdi

2007-12-01T23:59:59.000Z

280

Dual output acoustic wave sensor for molecular identification  

DOE Patents (OSTI)

A method of identification and quantification of absorbed chemical species by measuring changes in both the velocity and the attenuation of an acoustic wave traveling through a thin film into which the chemical species is sorbed. The dual output response provides two independent sensor responses from a single sensing device thereby providing twice as much information as a single output sensor. This dual output technique and analysis allows a single sensor to provide both the concentration and the identity of a chemical species or permits the number of sensors required for mixtures to be reduced by a factor of two.

Frye, Gregory C. (Cedar Crest, NM); Martin, Stephen J. (Albuquerque, NM)

1991-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "dual overhead cam" 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

Dual design resistor for high voltage conditioning and transmission lines  

DOE Patents (OSTI)

A dual resistor for eliminating the requirement for two different value resistors. The dual resistor includes a conditioning resistor at a high resistance value and a run resistor at a low resistance value. The run resistor can travel inside the conditioning resistor. The run resistor is capable of being advanced by a drive assembly until an electrical path is completed through the run resistor thereby shorting out the conditioning resistor and allowing the lower resistance run resistor to take over as the current carrier.

Siggins, Timothy Lynn (Newport News, VA); Murray, Charles W. (Hayes, VA); Walker, Richard L. (Norfolk, VA)

2007-01-23T23:59:59.000Z

282

Transformation of Dual-Polarized Radar Measurements to Arbitrary Polarization Bases  

Science Conference Proceedings (OSTI)

A fully polarimetric radar system consists of an orthogonal dual-polarized transmission mode and a dual-channel receive mode that are typically set to be copolar and cross polar to the transmit state of polarization. The transmit polarization ...

V. Chandrasekar; J. Hubbert; V. N. Bringi; P. F. Meischner

1994-08-01T23:59:59.000Z

283

A GPM Dual-Frequency Retrieval Algorithm: DSD Profile-Optimization Method  

Science Conference Proceedings (OSTI)

A new dual-frequency precipitation radar (DPR) will be included on the Global Precipitation Measurement (GPM) core satellite, which will succeed the highly successful Tropical Rainfall Measuring Mission (TRMM) satellite launched in 1997. New dual-...

C. R. Rose; V. Chandrasekar

2006-10-01T23:59:59.000Z

284

An Early Performance Evaluation of the NEXRAD Dual Polarization Radar Rainfall Estimates for Urban Flood Applications  

Science Conference Proceedings (OSTI)

Dual polarization radars are expected to provide better rainfall estimates than single polarization radars due to their ability to characterize hydrometeor type. The goal of this study is to evaluate single and dual polarization radar rainfall ...

Luciana K. Cunha; James A. Smith; Mary Lynn Baeck; Witold F. Krajewski

285

A Dual-Wavelength Radar Method for Ice-Water Characterization in Mixed-Phase Clouds  

Science Conference Proceedings (OSTI)

A dual-wavelength method to differentiate supercooled water from ice and to measure mass content in each phase in cold stratiform clouds is proposed and discussed. The differential attenuation Ad, whose direct measurement is available with dual-...

Marielle Gosset; Henri Sauvageot

1992-10-01T23:59:59.000Z

286

Potential Role Of Dual- Polarization Radar In The Validation Of Satellite Precipitation Measurements: Rationale and Opportunities  

Science Conference Proceedings (OSTI)

Dual-polarization weather radars have evolved significantly in the last three decades culminating in operational deployment by the National Weather Service. In addition to operational applications in the weather service, dual-polarization radars ...

V. Chandrasekar; V. N. Bringi; S. A. Rutledge; Arthur Hou; Eric Smith; Gail Skofronick Jackson; E. Gorgucci; W. A. Petersen

2008-08-01T23:59:59.000Z

287

Effects of Drop-Size-Distribution Truncation on Computer Simulations of Dual-Measurement Radar Methods  

Science Conference Proceedings (OSTI)

An investigation is made of the effects of truncating the raindrop-size distribution at minimum and maximum diameters on the results of computer simulations of dual-measurement radar methods. The dual-measurement methods investigated include ...

Carlton W. Ulbrich

1992-07-01T23:59:59.000Z

288

Incorporation of scattered radiation into dual?energy radiologic theory and application to mammography  

Science Conference Proceedings (OSTI)

A previous analysis of dual?energy imaging is extended to incorporate scattered radiation. The analysis is general and can include polyenergetic beams and nonideal detectors. In the dual?material basis plane

Paul C. Johns

1994-01-01T23:59:59.000Z

289

35-GHz Dual-Polarization Propagation Link for Rain-Rate Estimation  

Science Conference Proceedings (OSTI)

A 35-GHz dual-polarization propagation link (DPPL) is described and initial measurements are presented. The instrument is essentially a small, low-power, portable, dual linearly polarized pulsed radar that provides differential attenuation ...

Christopher S. Ruf; Kultegin Aydin; Savyasachee Mathur; Justin P. Bobak

1996-04-01T23:59:59.000Z

290

The potential for distributed generation in Japanese prototype buildings: A DER-CAM analysis of policy, tariff design, building energy use, and technology development (English Version)  

SciTech Connect

The August 2003 blackout of the northeastern U.S. and CANADA caused great economic losses and inconvenience to New York City and other affected areas. The blackout was a warning to the rest of the world that the ability of conventional power systems to meet growing electricity demand is questionable. Failure of large power systems can lead to serious emergencies. Introduction of on-site generation, renewable energy such as solar and wind power and the effective utilization of exhaust heat is needed, to meet the growing energy demands of the residential and commercial sectors. Additional benefit can be achieved by integrating these distributed technologies into distributed energy resource (DER) systems. This work demonstrates a method for choosing and designing economically optimal DER systems. An additional purpose of this research is to establish a database of energy tariffs, DER technology cost and performance characteristics, and building energy consumption for Japan. This research builds on prior DER studies at the Ernest Orlando Lawrence Berkeley National Laboratory (LBNL) and with their associates in the Consortium for Electric Reliability Technology Solutions (CERTS) and operation, including the development of the microgrid concept, and the DER selection optimization program, the Distributed Energy Resources Customer Adoption Model (DER-CAM). DER-CAM is a tool designed to find the optimal combination of installed equipment and an idealized operating schedule to minimize a site's energy bills, given performance and cost data on available DER technologies, utility tariffs, and site electrical and thermal loads over a test period, usually an historic year. Since hourly electric and thermal energy data are rarely available, they are typically developed by building simulation for each of six end use loads used to model the building: electric-only loads, space heating, space cooling, refrigeration, water heating, and natural-gas-only loads. DER-CAM provides a global optimization, albeit idealized, that shows how the necessary useful energy loads can be provided for at minimum cost by selection and operation of on-site generation, heat recovery, cooling, and efficiency improvements. This study examines five prototype commercial buildings and uses DER-CAM to select the economically optimal DER system for each. The five building types are office, hospital, hotel, retail, and sports facility. Each building type was considered for both 5,000 and 10,000 square meter floor sizes. The energy consumption of these building types is based on building energy simulation and published literature. Based on the optimization results, energy conservation and the emissions reduction were also evaluated. Furthermore, a comparison study between Japan and the U.S. has been conducted covering the policy, technology and the utility tariffs effects on DER systems installations. This study begins with an examination of existing DER research. Building energy loads were then generated through simulation (DOE-2) and scaled to match available load data in the literature. Energy tariffs in Japan and the U.S. were then compared: electricity prices did not differ significantly, while commercial gas prices in Japan are much higher than in the U.S. For smaller DER systems, the installation costs in Japan are more than twice those in the U.S., but this difference becomes smaller with larger systems. In Japan, DER systems are eligible for a 1/3 rebate of installation costs, while subsidies in the U.S. vary significantly by region and application. For 10,000 m{sup 2} buildings, significant decreases in fuel consumption, carbon emissions, and energy costs were seen in the economically optimal results. This was most noticeable in the sports facility, followed the hospital and hotel. This research demonstrates that office buildings can benefit from CHP, in contrast to popular opinion. For hospitals and sports facilities, the use of waste heat is particularly effective for water and space heating. For the other building types, waste heat is most effectivel

Zhou, Nan; Marnay, Chris; Firestone, Ryan; Gao, Weijun; Nishida, Masaru

2004-10-15T23:59:59.000Z

291

The potential for distributed generation in Japanese prototype buildings: A DER-CAM analysis of policy, tariff design, building energy use, and technology development (English Version)  

DOE Green Energy (OSTI)

The August 2003 blackout of the northeastern U.S. and CANADA caused great economic losses and inconvenience to New York City and other affected areas. The blackout was a warning to the rest of the world that the ability of conventional power systems to meet growing electricity demand is questionable. Failure of large power systems can lead to serious emergencies. Introduction of on-site generation, renewable energy such as solar and wind power and the effective utilization of exhaust heat is needed, to meet the growing energy demands of the residential and commercial sectors. Additional benefit can be achieved by integrating these distributed technologies into distributed energy resource (DER) systems. This work demonstrates a method for choosing and designing economically optimal DER systems. An additional purpose of this research is to establish a database of energy tariffs, DER technology cost and performance characteristics, and building energy consumption for Japan. This research builds on prior DER studies at the Ernest Orlando Lawrence Berkeley National Laboratory (LBNL) and with their associates in the Consortium for Electric Reliability Technology Solutions (CERTS) and operation, including the development of the microgrid concept, and the DER selection optimization program, the Distributed Energy Resources Customer Adoption Model (DER-CAM). DER-CAM is a tool designed to find the optimal combination of installed equipment and an idealized operating schedule to minimize a site's energy bills, given performance and cost data on available DER technologies, utility tariffs, and site electrical and thermal loads over a test period, usually an historic year. Since hourly electric and thermal energy data are rarely available, they are typically developed by building simulation for each of six end use loads used to model the building: electric-only loads, space heating, space cooling, refrigeration, water heating, and natural-gas-only loads. DER-CAM provides a global optimization, albeit idealized, that shows how the necessary useful energy loads can be provided for at minimum cost by selection and operation of on-site generation, heat recovery, cooling, and efficiency improvements. This study examines five prototype commercial buildings and uses DER-CAM to select the economically optimal DER system for each. The five building types are office, hospital, hotel, retail, and sports facility. Each building type was considered for both 5,000 and 10,000 square meter floor sizes. The energy consumption of these building types is based on building energy simulation and published literature. Based on the optimization results, energy conservation and the emissions reduction were also evaluated. Furthermore, a comparison study between Japan and the U.S. has been conducted covering the policy, technology and the utility tariffs effects on DER systems installations. This study begins with an examination of existing DER research. Building energy loads were then generated through simulation (DOE-2) and scaled to match available load data in the literature. Energy tariffs in Japan and the U.S. were then compared: electricity prices did not differ significantly, while commercial gas prices in Japan are much higher than in the U.S. For smaller DER systems, the installation costs in Japan are more than twice those in the U.S., but this difference becomes smaller with larger systems. In Japan, DER systems are eligible for a 1/3 rebate of installation costs, while subsidies in the U.S. vary significantly by region and application. For 10,000 m{sup 2} buildings, significant decreases in fuel consumption, carbon emissions, and energy costs were seen in the economically optimal results. This was most noticeable in the sports facility, followed the hospital and hotel. This research demonstrates that office buildings can benefit from CHP, in contrast to popular opinion. For hospitals and sports facilities, the use of waste heat is particularly effective for water and space heating. For the other building types, waste heat is most effectively use

Zhou, Nan; Marnay, Chris; Firestone, Ryan; Gao, Weijun; Nishida, Masaru

2004-10-15T23:59:59.000Z

292

TESTING OF THE DUAL ROTARY FILTER SYSTEM  

SciTech Connect

The Savannah River National Laboratory (SRNL) installed and tested two hydraulically connected SpinTek rotary microfilter (RMF) units to determine the behavior of a multiple filter system. Both units were successfully controlled by a control scheme written in DELTA-V architecture by Savannah River Remediation (SRR) Process Control Engineering personnel. The control system was tuned to provide satisfactory response to changing conditions during the operation of the multi-filter system. Stability was maintained through the startup and shutdown of one of the filter units while the second was still in operation. The installation configuration originally proposed by the Small Colum Ion Exchange (SCIX) project of independent filter and motor mountings may be susceptible to vibration. Significant stiffening of the filter and motor mounts was required to minimize the vibration. Alignment of the motor to the filter was a challenge in this test configuration. The deployment configuration must be easy to manipulate and allow for fine adjustment. An analysis of the vibration signature of the test system identified critical speeds. Whether it corresponds to the resonance frequency of a rotor radial vibration mode that was excited by rotor unbalance is uncertain based upon the measurements. A relative motion series should be completed on the filter with the final shaft configuration to determine if the resonances exist in the final filter design. The instrumentation selected for deployment, including the concentrate discharge control valve and flow meters, performed well. Automation of the valve control integrated well with the control scheme and when used in concert with the other control variables, allowed automated control of the dual RMF system. The one area of concern with the instrumentation was the condition resulting when the filtrate flow meter operated with less than three gpm. This low flow was at the lower range of performance for the flow meter. This should not be an issue in deployment where the desired flow rate will be within the normal operating range of the meter. Testing demonstrated that the use of a flexible line for the filtrate discharge is highly desired at the outlet of the rotary union to transition to the system piping. Isolating the vibration from the rotary union will significantly improve the lifetime of the seals. Methods to monitor and isolate individual filters should be considered during deployment. The ability to diagnose issues and isolate individual filters would allow isolation prior to failure. Thus, filters may be cleaned or repaired instead of requiring complete replacement if the condition were to continue unnoticed. Isolating the filtrate line of each filter during startup will minimize the premature buildup of solids on the filter disks. Several tests have shown that the method of filter startup can improve performance lifetime of the filters. The installation must factor in an air inlet for the draining of a filter that does not involve a reverse flow through the filter disks. The reverse flow may cause deformation of the disks or may damage other components of the filters themselves.

Herman, D.; Fowley, M.; Stefanko, D.

2011-08-29T23:59:59.000Z

293

Achieving maximum spatial diversity with decouple-and-forward relaying in dual-hop OSTBC transmissions  

Science Conference Proceedings (OSTI)

In this letter, we prove that decouple-and-forward (DCF) relaying for dual-hop orthogonal space-time block code (OSTBC) transmissions achieves the maximum diversity order attainable by dual-hop MIMO relaying systems. Decoupling at the relay transforms ... Keywords: OSTBC, decouple-and-forward relaying, diversity order, dual-hop MIMO system, rayleigh fading channels

In-Ho Lee; Dongwoo Kim

2010-03-01T23:59:59.000Z

294

An Interleaved Dual-Battery Power Supply for Battery-Operated Electronics  

E-Print Network (OSTI)

An Interleaved Dual-Battery Power Supply for Battery-Operated Electronics QingQing Wu,Wu, Qinru VoltageAnalysis of Optimal Supply Voltage Design of Interleaved DualDesign of Interleaved Dual--Battery PowerBattery Power SupplySupply ConclusionsConclusions #12;Batteries in Mobile/Portable ElectronicsBatteries

Pedram, Massoud

295

Piecewise structural diffusion defined on shape index for noise reduction in dual-energy CT images  

Science Conference Proceedings (OSTI)

The increasing radiation dose in dual-energy CT (DE-CT) scanning due to the double exposures at 80 kVp and 140 kVp is a major concern in the application of DE-CT. This paper presents a novel image-space denoising method, called piecewise structural ... Keywords: dual-energy CT, dual-energy CT colonography, noise reduction

Wenli Cai; June-Goo Lee; Da Zhang; Christina Piel; Hiroyuki Yoshida

2012-10-01T23:59:59.000Z

296

Dual variational principle for a problem of heat conduction in a rectangular plate  

Science Conference Proceedings (OSTI)

In this paper we formulate the dual variational principle for a problem of heat conduction in a rectangular domain, represented by elliptic equation with boundary conditions (Dirichlet-Neumann). The approximate solution for the dual variational problem ... Keywords: dual functional, heat transfer, weak solution

Mioara Boncu?; Dumitru Barac

2010-07-01T23:59:59.000Z

297

Dual aperture dipole magnet with second harmonic component  

DOE Patents (OSTI)

An improved dual aperture dipole electromagnet includes a second-harmonic frequency magnetic guide field winding which surrounds first harmonic frequency magnetic guide field windings associated with each aperture. The second harmonic winding and the first harmonic windings cooperate to produce resultant magnetic waveforms in the apertures which have extended acceleration and shortened reset portions of electromagnet operation.

Praeg, Walter F. (Palos Park, IL)

1985-01-01T23:59:59.000Z

298

Dual-Mode Space-Temporal Simultaneous Processing Equalizer  

Science Conference Proceedings (OSTI)

A tapped delayed line adaptive array antenna (TDL-AAA) and a space-temporal simultaneous processing equalizer (ST-SPE) are proposed as simple space-temporal equalizers based on minimum mean square error (MMSE) criterion. The ST-SPE has a compact hardware ... Keywords: MMSE, dual-mode, space-temporal simultaneous processing equalizer

Yoshihiro Ichikawa; Shigeki Obote; Kenichi Kagoshima

2005-12-01T23:59:59.000Z

299

Wrought stainless steels -- Dual marking and corrosion evaluation  

SciTech Connect

Prior to the 1980s, the commonly used type 300 austenitic series stainless steels (SS) in the chemical process industry were available in two grades: those with regular carbon content (straight grades) and those with extra-low carbon content (L-grades). When welding the straight grades, it was possible to sensitize the base metal adjacent to the weld. The carbon combines with the chromium at the grain boundaries, leaving a zone depleted of chromium, below the minimum required for SS, adjacent to the grain boundaries. Even a relatively mild corrosive environment then is able to selectively attack this region along grain boundaries. The dual-marked grades (types 304/304L and 316/316L) appeared, with the carbon content of an L-grade and the strength of a straight grade. Initially, there was no national code acceptance for dual marked grades. Designers were obliged to use L-grade stress values. To get around this, people were known to grind off the unacceptable part of the dual marking designation and deliver whatever grade was initially specified. ASME International now has formally stated that dual-marked grades may be used at straight grade stresses for all product forms and piping to 1,000 F (540 C).

Kobrin, G.; Lilly, J.; MacDiarmid, J.; Moniz, B.

1999-10-01T23:59:59.000Z

300

Potential of Malaysian activated carbon in dual purpose adsorption system  

Science Conference Proceedings (OSTI)

The adsorption capability of some locally produced activated charcoal (coconut shell) samples with methanol were taken under laboratory conditions. An experimental test rig was set up; data obtained from the experiments were fitted to Dubinin-Radushkevitch ... Keywords: Malaysian activated carbon, adsorption properties, coefficient of performance (COP), dual purpose system

M. A. Alghoul; M. Y. Sulaiman; K. Sopian; M. Yahya; Azami Zaharim

2008-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "dual overhead cam" 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

On Type IIA geometries dual to N = 2 SCFTs  

E-Print Network (OSTI)

We provide explicit solutions of Type IIA supergravity which are believed to be dual to N = 2 superconformal four dimensional gauge theories. These explicit solutions are based on the general ansatz for such a type of backgrounds introduced by Gaiotto and Maldacena.

R. A. Reid-Edwards; B. Stefanski jr

2010-10-31T23:59:59.000Z

302

SVM based feature selection: why are we using the dual?  

Science Conference Proceedings (OSTI)

Most Support Vector Machines (SVM) implementations are based on solving the dual optimization problem. Of course, feature selection algorithms based on SVM are not different and, in particular, the most used method in the area, Guyon et al.'s Recursive ...

Guillermo L. Grinblat; Javier Izetta; Pablo M. Granitto

2010-11-01T23:59:59.000Z

303

A case for dual-mapping one-way caches  

Science Conference Proceedings (OSTI)

This paper proposes a dual-mapping function for one-way data cache to reduce cache misses, write-back rates, and access time for single-core or multi-core computing processors. Our simulation results show that it reduces cache misses significantly compared ...

Arul Sandeep Gade; Yul Chu

2006-03-01T23:59:59.000Z

304

A Robust Dual-Frequency Radar Profiling Algorithm  

Science Conference Proceedings (OSTI)

In this study, an algorithm to retrieve precipitation from spaceborne dual-frequency (13.8 and 35.6 GHz, or Ku/Ka band) radar observations is formulated and investigated. Such algorithms will be of paramount importance in deriving radar-based and ...

Mircea Grecu; Lin Tian; William S. Olson; Simone Tanelli

2011-07-01T23:59:59.000Z

305

Dual aperture dipole magnet with second harmonic component  

DOE Patents (OSTI)

An improved dual aperture dipole electromagnet includes a second-harmonic frequency magnetic guide field winding which surrounds first harmonic frequency magnetic guide field windings associated with each aperture. The second harmonic winding and the first harmonic windings cooperate to produce resultant magnetic waveforms in the apertures which have extended acceleration and shortened reset portions of electromagnet operation.

Praeg, W.F.

1983-08-31T23:59:59.000Z

306

Brief Analysis of dual-rate inferential control systems  

Science Conference Proceedings (OSTI)

For a dual-rate control system where the output sampling interval is an integer multiple of the control interval, we propose a model-based inferential control scheme which uses a fast-rate model to estimate the intersample outputs and then supply them ... Keywords: Digital control, Inferential control, Multirate systems, Robustness, Stability

Dongguang Li; Sirish L. Shah; Tongwen Chen

2002-06-01T23:59:59.000Z

307

Oak Ridge D and D Plan 3515 Project - Technology Review (2007) and GammaCam Technology Demonstration for Characterizing Building 3515 at Oak Ridge (2007)  

Science Conference Proceedings (OSTI)

This paper presents the results from the Characterization, Decontamination and Decommissioning (CD and D) Study performed by MSE Technology Application, Inc. (MSE) to assist the U.S. Department of Energy (DOE) and Oak Ridge National Laboratory (ORNL) in the preparation of a Project Execution Plan and Remediation Plan for Building 3515 at ORNL. Primary objectives of this study were to identify innovative CD and D technologies and methodologies and recommend alternatives applicable to the CD and D of Building 3515. Building 3515 is a small heavily shielded concrete and cement block structure centrally located in the Bethel Valley portion of the ORNL. The building's interior is extensively contaminated with Cesium 137 (Cs-137), the primary contaminant of concern. A previous attempt to characterize the building was limited to general interior area radiation exposure level measurements and a few surface smears gathered by inserting monitoring equipment into the building on long poles. Consequently, the spatial distribution of the gamma radiation source inside the building was not determined. A subsequent plan for D and D of the building presented a high risk of worker radiation dose in excess of as low as reasonably achievable (ALARA) because the source of the interior gamma radiation field is not completely understood and conventional practices required workers to be in close proximity of the building. As part of an initial literature search, MSE reviewed new generation gamma source characterization technologies and identified the GammaCam{sup TM} portable gamma ray imaging system as an innovative technology applicable to locating the dominant gamma ray sources within the building. The GammaCam{sup TM} gamma-ray imaging system is a commercially available technology marketed by the EDO Corporation. This system consists of a sensor head with a co-aligned camera and a portable computer. The system is designed to provide two-dimensional spatial mappings of gamma ray emitting nuclides in real time. The gamma radiation sensor and camera can be set up within or outside of the radiation field while the system operator and PC can be located 30 to 60 m (100 to 200 ft) from the sensor head. The system has been used successfully at numerous DOE and commercial nuclear facilities to precisely locate gamma radiation sources. However, literature attesting to the ability of this technology to detect radiation sources within heavily shielded structures was not available. Consequently, MSE was not certain if this technology would be capable of locating gamma ray sources within the heavily shielded Building 3515. To overcome this uncertainty, MSE sent two individuals to the EDO Corporation for training. At completion of the training, MSE leased the GammaCam{sup TM} portable system and brought it to ORNL to evaluate the capability of the system. An overview from this evaluation is summarized in this paper. (authors)

Byrne-Kelly, D.; Hart, A.; Brown, Ch.; Jordan, D. [MSE Technology Applications, Inc., Montana (United States); Phillips, E. [U.S. Department of Energy, Oak Ridge Operations Office, Oak Ridge, Tennessee (United States)

2008-07-01T23:59:59.000Z

308

A dual mass flux framework for boundary layer convection  

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

A dual mass flux framework for boundary layer convection A dual mass flux framework for boundary layer convection Neggers, Roel European Centre for Medium-range Weather Forecasts (ECMWF) Category: Modeling A new convective boundary layer scheme is presented that is currently being developed for the Integrated Forecasting System (IFS) of the European Centre for Medium-range Weather Forecasts (ECMWF). Part of the total turbulent flux is modeled through advective mass flux by multiple updrafts, initialized at the surface. Two groups of updrafts are explicitly represented; i) updrafts that never reach their lifting condensation level, and ii) updrafts that condensate and become cloudy. Key new ingredient is the flexibility of the associated updraft area fractions, as a function of model state. As a result, an extra degree of freedom is introduced in the

309

String Gas Shells, their Dual Radiation and Hedgehog Signature Control  

E-Print Network (OSTI)

We search for spherically symmetric, stationary solutions with a string gas shell as a source. The requirement of a uniform newtonian potential, or constancy of the 00 component of the metric, implies the existence of a "dual" radiation, which we argue can be interpreted as representing the virtual quantum fluctuations that stabilize the shell. A string hedgehog can be introduced also into the solution. For zero or small hedgehog strength the string gas shell is of a regular nature, while the dual radiation is of a spacelike nature. For higher hedgehog strengths however the radiation "materializes" and becomes timelike while the string gas shell becomes space like. The significance of these solutions for the quantum theory is discussed.

E. I. Guendelman

2009-03-12T23:59:59.000Z

310

Single-stage dual priority regulator for photovoltaic systems  

DOE Green Energy (OSTI)

In this paper the design and application of a voltage regulator for use in Photovoltaic Systems with two separate loads of different priority is presented. The Single-Stage Dual Priority Regulator (SSDPR) charges two separate battery systems for high and low priority loads. The controller always charges the main battery first. It toggles between the two batteries when the main battery is nearly charged, and reduces the charge duty cycle of the main battery as it approaches full charge. The SSDPR utilizes the PV more efficiently by supplying low priority loads without jeopardizing the reliability of the critical load. Both the main and auxiliary voltage settings are adjustable, allowing the use of different types of batteries. The SDPR is being tested in the University of Lowell Vaccine Refrigerator Laboratory. A dual priority regulator is useful in any stand-alone system with multiple loads. Uses include photovoltaic powered homes, medical clinics, and recreational vehicles.

Salameh, Z.M.; Lynch, W.A. (Univ. of Massachusetts, Lowell (United States))

1992-01-01T23:59:59.000Z

311

Dual superconductivity and vacuum properties in Yang--Mills theories  

E-Print Network (OSTI)

We address, within the dual superconductivity model for color confinement, the question whether the Yang-Mills vacuum behaves as a superconductor of type I or type II. In order to do that we compare, for the theory with gauge group SU(2), the determination of the field penetration depth $\\lambda$ with that of the superconductor correlation length $\\xi$. The latter is obtained by measuring the temporal correlator of a disorder parameter developed by the Pisa group to detect dual superconductivity. The comparison places the vacuum close to the border between type I and type II and marginally on the type II side. We also check our results against the study of directly measurable effects such as the interaction between two parallel flux tubes, obtaining consistent indications for a weak repulsive behaviour. Future strategies to improve our investigation are discussed.

A. D'Alessandro; M. D'Elia; L. Tagliacozzo

2006-07-12T23:59:59.000Z

312

Dual Superconductivity from Yang-Mills Theory via Connection Decomposition  

E-Print Network (OSTI)

We derive an Abelian-Higgs-like action from SU(2) Yang-Mills theory via monopole-condensation assumption. Abelian projection as well as chromo-'electric-magnetic' duality are naturally realized by separating the small off-diagonal gluon part from diagonal gluon field according to the order of inverse coupling constant($1/g$). It is shown that Abelian dominance can follow from infrared behavior of ranning coupling constant and the mass generation of chromo-electric field as well as off-diagonal gluon is due to the quantum fluctuation of orientation of Abelian direction. Dual superconductivity of theory vacuum is confirmed by deriving dual London equation for chromo-electronic field.

Duoje Jia

2005-09-03T23:59:59.000Z

313

Wilson loops in string duals of walking and flavored systems  

Science Conference Proceedings (OSTI)

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

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

2010-04-15T23:59:59.000Z

314

Retractable pin dual in-line package test clip  

DOE Patents (OSTI)

This invention is a Dual In-Line Package (DIP) test clip for use when troubleshooting circuits containing DIP integrated circuits. This test clip is a significant improvement over existing DIP test clips in that it has retractable pins which will permit troubleshooting without risk of accidentally shorting adjacent pins together when moving probes to different pins on energized circuits or when the probe is accidentally bumped while taking measurements.

Bandzuch, Gregory S. (Washington, PA); Kosslow, William J. (Jefferson Boro, PA)

1996-01-01T23:59:59.000Z

315

Dual Environment Effects on the Oxidation of Metallic Interconnects  

DOE Green Energy (OSTI)

Metallic interconnects in solid oxide fuel cells are exposed to a dual environment: fuel on one side (i.e. H2 gas) and oxidizer on the other side (i.e. air). It has been observed that the oxidation behavior of thin stainless steel sheet in air is changed by the presence of H2 on the other side of the sheet. The resulting dual environment scales are flaky and more friable than the single environment scales. The H2 disrupts the scale on the air-side. A model to explain some of the effects of a dual environment is presented where hydrogen diffusing through the stainless steel sheet reacts with oxygen diffusing through the scale to form water vapor, which has sufficient vapor pressure to mechanically disrupt the scale. Experiments on preoxidized 316L stainless steel tubing exposed to air/air, H2/air, and H2/Ar environments are reported in support of the model.

Holcomb, Gordon R.; Ziomek-Moroz, Malgorzata; Cramer, Stephen D.; Covino, Jr., Bernard S.; and Bullard, Sophie J.

2004-10-20T23:59:59.000Z

316

NETL: Pre-Combustion Carbon Dioxide Capture by a New Dual-Phase Ceramic  

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

Pre-Combustion Carbon Dioxide Capture by a New Dual-Phase Ceramic Carbonate Membrane Reactor Pre-Combustion Carbon Dioxide Capture by a New Dual-Phase Ceramic Carbonate Membrane Reactor Project No.: DE-FE0000470 Arizona State University is developing a dual-phase, membrane-based separation device which will separate carbon dioxide (CO2) from typical water gas shift (WGS) mixture feeds and produce hydrogen, which can be introduced into the combustion turbines of integrated gasification combined cycle (IGCC) plants. The objectives of the project are experimental studies of the synthesis of a high-temperature, chemically and thermally stable and CO2 perm-selective dual-phase membrane and its use as a membrane reactor for WGS reaction to produce H2 and CO2 rich streams. Concept of ceramic-carbonate dual phase membranes for CO2 separation. Concept of ceramic-carbonate dual phase membranes for CO2 separation.

317

Dual formulations of non-abelian spin models: local representation and low-temperature asymptotics  

E-Print Network (OSTI)

Non-abelian lattice spin models with symmetry group SU(N) or U(N) can be formulated in terms of link variables which are subject to the Bianchi constraints. Using this representation we derive exact and local dual formulation for the partition function of such models on a cubic lattice in arbitrary dimension D. Locality means that the dual action is given by a sum over some subset of hypercubes of the dual lattice and the interaction between dual variables ranges over one given hypercube. Dual variables are in general discrete-valued and live on (D-2)-cell of the dual lattice, in close analogy with the XY model. We use our construction to study in details the dual of SU(2) principal chiral model in two dimensions. We give dual expressions also for two-point correlation function in arbitrary representation and for the free energy of defects. Leading terms of the asymptotic expansion of the dual Boltzmann factor are computed and it is proven that at low temperatures it converges to a certain Gaussian distribution uniformly in all fluctuations of dual variables. This result enables us to define the semiclassical limit of the dual formulation and to determine an analog of the vortex--spin-wave representation for the partition function. Such representation is used to extract leading perturbative contribution to the correlation function which shows power-like decay at weak coupling. We also present some analytical evidences that the low-temperature limit of the dual formulation is completely described by ISO(2)-like approximation of SU(2) matrix elements.

O. Borisenko; V. Kushnir

2004-12-27T23:59:59.000Z

318

Future Inspection of Overhead Transmission Lines  

Science Conference Proceedings (OSTI)

This report documents scenarios and technologies that can be applied in the future for the inspection of transmission lines. Scenarios describe the utilization of a range of concepts, including distributed sensors, unmanned airborne vehicles, RF communication, and robotics. An approach to performing demonstration projects using currently available technologies is provided and will be implemented in the following phases of the project.

2008-06-23T23:59:59.000Z

319

INTEGRATED VERTICAL AND OVERHEAD DECONTAMINATION (IVOD) SYSTEM  

Science Conference Proceedings (OSTI)

The deactivation and decommissioning of 1200 buildings within the U.S. Department of Energy-Office of Environmental Management complex will require the disposition of a large quantity of contaminated concrete and metal surfaces. It has been estimated that 23 million cubic meters of concrete and over 600,000 tons of metal will need disposition. The disposition of such large quantities of material presents difficulties in the area of decontamination and characterization. The final disposition of this large amount of material will take time and money as well as risk to the D&D work force. A single automated system that would decontaminate and characterize surfaces in one step would not only reduce the schedule and decrease cost during D&D operations but would also protect the D&D workers from unnecessary exposures to contaminated surfaces. This report summarizes the activities performed during FY00 and describes the planned activities for FY01. Accomplishments for FY00 include the following: Development and field-testing of characterization system; Completion of Title III design of deployment platform and decontamination unit; In-house testing of deployment platform and decontamination unit; Completion of system integration design; Identification of deployment site; and Completion of test plan document for deployment of IVOD at Rancho Seco nuclear power facility.

M.A. Ebadian, Ph.D.

2001-01-01T23:59:59.000Z

320

A new warmstarting strategy for the primal-dual column generation ...  

E-Print Network (OSTI)

Jun 24, 2012 ... Abstract: This paper presents a new warmstarting technique in the context of a primal-dual column generation method applied to solve a ...

Note: This page contains sample records for the topic "dual overhead cam" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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321

Optimization Online - A Primal-Dual Algorithm for Computing a Cost ...  

E-Print Network (OSTI)

Oct 23, 2011 ... A Primal-Dual Algorithm for Computing a Cost Allocation in the Core of Economic Lot-Sizing Games. Mohan Gopaladesikan (mohang ***at*** ...

322

Local Analysis of the Feasible Primal-Dual Interior-Point Method R ...  

E-Print Network (OSTI)

R. Silva ?. J. Soares †. L. N. Vicente ‡. Abstract. In this paper we analyze the rate of local convergence of the Newton primal-dual interior- point method when ...

323

Primal-dual algorithms and infinite-dimensional Jordan algebras of ...  

E-Print Network (OSTI)

Mar 31, 2003 ... Primal-dual algorithms and infinite-dimensional Jordan algebras of finite ... of the technique of finite-dimensional Euclidean Jordan algebras to ...

324

Dual Fuel Conversion System for Diesel Engines: Inventions and Innovation Project Fact Sheet  

DOE Green Energy (OSTI)

Project fact sheet written for the Inventions and Innovation Program about a new dual fuel conversion system allows diesel fuel switching with clean burning natural gas.

Wogsland, J.

2001-01-25T23:59:59.000Z

325

Market Assessment of Retrofit Dual-Fuel Diesel Generators  

Science Conference Proceedings (OSTI)

Reciprocating engines have long played an important role in the distributed resources market and should continue to provide end-use customers and energy companies benefits in both on-site and grid-connected power generation service. This report presents results of collaborative technical and economic market analyses with a major engine manufacturer to examine the prospects for conversion of existing diesel generators in the 500-2000 kW size range to dual-fuel (natural gas and diesel fuel) operation. Thes...

2001-11-30T23:59:59.000Z

326

Dual wavelength laser damage testing for high energy lasers.  

Science Conference Proceedings (OSTI)

As high energy laser systems evolve towards higher energies, fundamental material properties such as the laser-induced damage threshold (LIDT) of the optics limit the overall system performance. The Z-Backlighter Laser Facility at Sandia National Laboratories uses a pair of such kiljoule-class Nd:Phosphate Glass lasers for x-ray radiography of high energy density physics events on the Z-Accelerator. These two systems, the Z-Beamlet system operating at 527nm/ 1ns and the Z-Petawatt system operating at 1054nm/ 0.5ps, can be combined for some experimental applications. In these scenarios, dichroic beam combining optics and subsequent dual wavelength high reflectors will see a high fluence from combined simultaneous laser exposure and may even see lingering effects when used for pump-probe configurations. Only recently have researchers begun to explore such concerns, looking at individual and simultaneous exposures of optics to 1064 and third harmonic 355nm light from Nd:YAG [1]. However, to our knowledge, measurements of simultaneous and delayed dual wavelength damage thresholds on such optics have not been performed for exposure to 1054nm and its second harmonic light, especially when the pulses are of disparate pulse duration. The Z-Backlighter Facility has an instrumented damage tester setup to examine the issues of laser-induced damage thresholds in a variety of such situations [2] . Using this damage tester, we have measured the LIDT of dual wavelength high reflectors at 1054nm/0.5ps and 532nm/7ns, separately and spatially combined, both co-temporal and delayed, with single and multiple exposures. We found that the LIDT of the sample at 1054nm/0.5ps can be significantly lowered, from 1.32J/cm{sup 2} damage fluence with 1054/0.5ps only to 1.05 J/cm{sup 2} with the simultaneous presence of 532nm/7ns laser light at a fluence of 8.1 J/cm{sup 2}. This reduction of LIDT of the sample at 1054nm/0.5ps continues as the fluence of 532nm/7ns laser light simultaneously present increases. The reduction of LIDT does not occur when the 2 pulses are temporally separated. This paper will also present dual wavelength LIDT results of commercial dichroic beam-combining optics simultaneously exposed with laser light at 1054nm/2.5ns and 532nm/7ns.

Atherton, Briggs W.; Rambo, Patrick K.; Schwarz, Jens; Kimmel, Mark W.

2010-05-01T23:59:59.000Z

327

DUAL PHASE MEMBRANE FOR HIGH TEMPERATURE CO2 SEPARATION  

SciTech Connect

This project is intended to expand upon the previous year's research en route to the development of a sustainable dual phase membrane for CO{sub 2} separation. It was found that the pores within the supports had to be less than 9 {micro}m in order to maintain the stability of the dual phase membrane. Pores larger than 9 {micro}m would be unable to hold the molten carbonate phase in place, rendering the membrane ineffective. Calculations show that 80% of the pore volume of the 0.5 media grade metal support was filled with the molten carbonate. Information obtained from EDS and SEM confirmed that the molten carbonate completely infiltrated the pores on both the contact and non-contact size of the metal support. Permeation tests for CO{sub 2} and N{sub 2} at 450-750 C show very low permeance of those two gases through the dual phase membrane, which was expected due to the lack of ionization of those two gases. Permeance of the CO{sub 2} and O{sub 2} mixture was much higher, indicating that the gases do form an ionic species, CO{sub 3}{sup 2-}, enhancing transport through the membrane. However, at temperatures in excess of 650 C, the permeance of CO{sub 3}{sup 2-} decreased quite rapidly, while predictions showed that permeance should have continued to increase. XRD data obtained form the surface of the membrane indicated the formation of lithium iron oxides on the support. This layer has a very low conductivity, which drastically reduces the flow of electrons to the CO{sub 2}/O{sub 2} gas mixture, limiting the formation of the ionic species. These results indicate that the use of stainless steel supports in a high temperature oxidative environment can lead to decreased performance of the membranes. This revelation has created the need for an oxidation resistant support, which can be gained by the use of a ceramic-type membrane. Future research efforts will be directed towards preparation of a new ceramic-carbonate dual phase membrane. The membrane will based on an oxide ceramic support that has an oxidation resistance better than the metal support and high electronic conductivity (1200-1500 S/cm) in the interested temperature range (400-600 C).

Jerry Y.S. Lin; Seungjoon Chung; Matthew Anderson

2005-12-01T23:59:59.000Z

328

Photoemission with Chemical Potential from QCD Gravity Dual  

E-Print Network (OSTI)

We consider a $D4-D8-\\bar D8$ brane construction which gives rise to a large N QCD at sufficiently small energies. Using the gravity dual of this system, we study chiral phase transition at finite chemical potential and temperature and find a line of first order phase transitions in the phase plane. We compute the spectral function and the photon emission rate. The trace of the spectral function is monotonic at vanishing chemical potential, but develops some interesting features as the value of the chemical potential is increased.

Andrei Parnachev; David A. Sahakyan

2006-10-23T23:59:59.000Z

329

Dual-circuit, multiple-effect refrigeration system and method  

DOE Patents (OSTI)

A dual circuit absorption refrigeration system comprising a high temperature single-effect refrigeration loop and a lower temperature double-effect refrigeration loop separate from one another and provided with a double-condenser coupling therebetween. The high temperature condenser of the single-effect refrigeration loop is double coupled to both of the generators in the double-effect refrigeration loop to improve internal heat recovery and a heat and mass transfer additive such as 2-ethyl-1-hexanol is used in the lower temperature double-effect refrigeration loop to improve the performance of the absorber in the double-effect refrigeration loop.

DeVault, Robert C. (Knoxville, TN)

1995-01-01T23:59:59.000Z

330

Gauge theories on hyperbolic spaces and dual wormhole instabilities  

Science Conference Proceedings (OSTI)

We study supergravity duals of strongly coupled four-dimensional gauge theories formulated on compact quotients of hyperbolic spaces. The resulting background geometries are represented by Euclidean wormholes, which complicate establishing the precise gauge theory/string theory correspondence dictionary. These backgrounds suffer from the nonperturbative instabilities arising from the D3D3-bar pair-production in the background four-form potential. We discuss conditions for suppressing this Schwingerlike instability. We find that Euclidean wormholes arising in this construction develop a naked singularity before they can be stabilized.

Buchel, Alex [Department of Applied Mathematics, University of Western Ontario, London, Ontario N6A 5B7 (Canada); Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2J 2W9 (Canada)

2004-09-15T23:59:59.000Z

331

Quasicrystals: Atomic coverings and windows are dual projects  

E-Print Network (OSTI)

In the window approach to quasicrystals, the atomic position space E_parallel is embedded into a space E^n = E_parallel + E_perp. Windows are attached to points of a lattice Lambda \\in E^n. For standard 5fold and icosahedral tiling models, the windows are perpendicular projections of dual Voronoi and Delone cells from Lambda. Their cuts by the position space E_parallel mark tiles and atomic positions. In the alternative covering approach, the position space is covered by overlapping copies of a quasi-unit cell which carries a fixed atomic configuration. The covering and window approach to quasicrystals are shown to be dual projects: D- and V- clusters are defined as projections to position space E_parallel of Delone or Voronoi cells. Decagonal V-clusters in the Penrose tiling, related to the decagon covering, and two types of pentagonal D-clusters in the triangle tiling of 5fold point symmetry with their windows are analyzed. They are linked, cover position space and have definite windows. For functions compatible with the tilings they form domains of definition. For icosahedral tilings the V-clusters are Kepler triacontahedra, the D-clusters are two icosahedra and one dodecahedron.

Peter Kramer

1999-04-01T23:59:59.000Z

332

Dual Phase Membrane for High Temperature CO2 Separation  

SciTech Connect

This project aimed at synthesis of a new inorganic dual-phase carbonate membrane for high temperature CO{sub 2} separation. Metal-carbonate dual-phase membranes were prepared by the direct infiltration method and the synthesis conditions were optimized. Permeation tests for CO{sub 2} and N{sub 2} from 450-750 C showed very low permeances of those two gases through the dual-phase membrane, which was expected due to the lack of ionization of those two particular gases. Permeance of the CO{sub 2} and O{sub 2} mixture was much higher, indicating that the gases do form an ionic species, CO{sub 3}{sup 2-}, enhancing transport through the membrane. However, at temperatures in excess of 650 C, the permeance of CO{sub 3}{sup 2-} decreased rapidly, while predictions showed that permeance should have continued to increase with temperature. XRD data obtained from used membrane indicated that lithium iron oxides formed on the support surface. This lithium iron oxide layer has a very low conductivity, which drastically reduces the flow of electrons to the CO{sub 2}/O{sub 2} gas mixture; thus limiting the formation of the ionic species required for transport through the membrane. These results indicated that the use of stainless steel supports in a high temperature oxidative environment can lead to decreased performance of the membranes. This revelation created the need for an oxidation resistant support, which could be gained by the use of a ceramic-type membrane. Work was extended to synthesize a new inorganic dual-phase carbonate membrane for high temperature CO{sub 2} separation. Helium permeance of the support before and after infiltration of molten carbonate are on the order of 10{sup -6} and 10{sup -10} moles/m{sup 2} {center_dot} Pa {center_dot} s respectively, indicating that the molten carbonate is able to sufficiently infiltrate the membrane. It was found that La{sub 0.6}Sr{sub 0.4}Co{sub 0.8}Fe{sub 0.2}O{sub 3-{delta}} (LSCF) was a suitable candidate for the support material. This support material proved to separate CO{sub 2} when combined with O{sub 2} at a flux of 0.194 ml/min {center_dot} cm{sup 2} at 850 C. It was also observed that, because LSCF is a mixed conductor (conductor of both electrons and oxygen ions), the support was able to provide its own oxygen to facilitate separation of CO{sub 2}. Without feeding O{sub 2}, the LSCF dual phase membrane produced a maximum CO{sub 2} flux of 0.246 ml/min {center_dot} cm{sup 2} at 900 C.

Jerry Lin

2007-06-30T23:59:59.000Z

333

The Intelligent Study on Diesel-LNG Dual Fuel Marine Diesel Engine  

Science Conference Proceedings (OSTI)

In this article, a diesel engine named "X6170ZC" has been converted into a dual-fuel engine of diesel and liquefied natural gas (LNG). The principle, composition and characteristics of electronic control system for the engine have been introduced. An ... Keywords: engine, dual-fuel, intelligent

Zhang Liang

2012-03-01T23:59:59.000Z

334

A new algorithm for improved VDD assignment in low power dual VDD systems  

Science Conference Proceedings (OSTI)

We present the first in-depth study of the two existing algorithms, namely, Clustered Voltage Scaling (CVS) and Extended Clustered Voltage Scaling (ECVS), used for assigning the voltage supply to gates in integrated circuits having dual power supplies. ... Keywords: CVS, ECVS, dual VDD design, level converters, low power design algorithms

Sarvesh H. Kulkarni; Ashish N. Srivastava; Dennis Sylvester

2004-08-01T23:59:59.000Z

335

A First-Order Primal-Dual Algorithm for Convex Problems with Applications to Imaging  

Science Conference Proceedings (OSTI)

In this paper we study a first-order primal-dual algorithm for non-smooth convex optimization problems with known saddle-point structure. We prove convergence to a saddle-point with rate O(1/N) in finite dimensions for the complete ... Keywords: Convex optimization, Dual approaches, Image, Inverse problems, Reconstruction, Total variation

Antonin Chambolle; Thomas Pock

2011-05-01T23:59:59.000Z

336

The piston dynamics under knock situation of diesel dual fuel engine: a numerical study  

Science Conference Proceedings (OSTI)

A compression ignition engine fueled by natural gas or Diesel Dual Fuel (DDF) engine is a promising engine for the future of a high oil price. Unfortunately, the DDF engine knocks easily: this leads to damage of pistons. So, the understanding of the ... Keywords: diesel dual fuel engine, knock, mixed-lubrication, modelling, piston secondary motion, simulation

Krisada Wannatong; Somchai Chanchaona; Surachai Sanitjai

2007-01-01T23:59:59.000Z

337

Quality Control and Calibration of the Dual-Polarization Radar at Kwajalein, RMI  

Science Conference Proceedings (OSTI)

The dual-polarization weather radar on the Kwajalein Atoll in the Republic of the Marshall Islands (KPOL) is one of the only full-time (24/7) operational S-band dual-polarimetric (DP) radars in the tropics. Through the use of KPOL DP and ...

David A. Marks; David B. Wolff; Lawrence D. Carey; Ali Tokay

2011-02-01T23:59:59.000Z

338

Application of Two-Speed Dual Clutch Transmission in Pure Electric Vehicle  

Science Conference Proceedings (OSTI)

Two-speed dual clutch transmission is used in electric vehicle to improve vehicle power performance and efficiency of an electric driveline. To illustrate the improvement of power performance and efficiency, single-speed transmission system was introduced ... Keywords: pure electric vehicle, dual clutch transmission, single-speed transmission

Yongdao Song; Xiusheng Cheng; Zhonghua Lu; Xueshong Li

2012-10-01T23:59:59.000Z

339

Dual home agent (DHA)-based location management scheme in integrated cellular-WLAN networks  

Science Conference Proceedings (OSTI)

For seamless integration of cellular and wireless local area network (WLAN) systems, we introduce a dual home agent (DHA)-based location management. The DHA maintains the location information both in the cellular and WLAN systems, and therefore unnecessary ... Keywords: Cellular-WLAN integration, Dual home agent (DHA), Mobile IP, Performance analysis

Sangheon Pack; Wonjun Lee

2008-12-01T23:59:59.000Z

340

Dual control of vascular tone and remodelling by ATP released from nerves and endothelial cells  

E-Print Network (OSTI)

-term control of cell proliferation, migration and death involved in vascular remodelling. There is dual controlReview Dual control of vascular tone and remodelling by ATP released from nerves and endothelial.burnstock@ucl.ac.uk Abstract: Purinergic signalling is important both in short-term control of vascular tone and in longer

Burnstock, Geoffrey

Note: This page contains sample records for the topic "dual overhead cam" 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

Cooperative Control of a 3D Dual-Flexible-Arm Robot  

Science Conference Proceedings (OSTI)

This paper discusses cooperative control of a dual-flexible-arm robot to handle a rigid object in three-dimensional space. The proposed control scheme integrates hybrid position/force control and vibration suppression control. To derive the control scheme, ... Keywords: cooperative control, dual-flexible-arm robot, internal force, lumped-parameter model, task vector, vibration control

Mitsuhiro Yamano; Jin-Soo Kim; Atsushi Konno; Masaru Uchiyama

2004-01-01T23:59:59.000Z

342

A Primal-Dual Estimator of Production and Cost Functions Within an Errors-in-Variables Context  

E-Print Network (OSTI)

The GAE model of production and cost presented here can beDual Estimator of Production and Cost Functions Within anDual Estimator of Production and Cost Functions Within an

Paris, Quirino; Caputo, Michael R.

2004-01-01T23:59:59.000Z

343

Dual-Doppler and Single-Doppler Analysis of a Tornadic Storm Undergoing Mergers and Repeated Tornadogenesis  

Science Conference Proceedings (OSTI)

Dual-Doppler observations with unprecedented finescale spatial and temporal resolution are used to characterize the vector wind field in and near a tornado occurring near Kiefer, Oklahoma, on 26 May 1997. Analyses of the dual-Doppler vector wind ...

Joshua Wurman; Yvette Richardson; Curtis Alexander; Stephen Weygandt; Peng Fei Zhang

2007-03-01T23:59:59.000Z

344

Design, analysis, and testing of a precision guidance, navigation, and control system for a dual-spinning Cubesat  

E-Print Network (OSTI)

The Microsized Microwave Atmospheric Satellite (MicroMAS) combines two traditional control approaches: a dual spinner and a three-axis gyrostat. Unlike typical dual spinners, the purpose of MicroMAS 's 2U bus and spinner ...

Wise, Evan Dale

2013-01-01T23:59:59.000Z

345

Influence of Agricultural Dual Credit on Student College Readiness Self-Efficacy  

E-Print Network (OSTI)

The purpose of this correlational and descriptive study was to examine the influence of an agricultural dual credit course curriculum on student self-efficacy of college readiness as students matriculate to post-secondary education. To evaluate the personal characteristics, postsecondary plans, program perceptions and college readiness self-efficacy, a quantitative survey and online instrument was used to gather data and analyze information on high school students enrolled in agricultural education in both dual credit and non-dual credit courses primarily in the Middle Tennessee Region. The target population (N = 543) for this study was defined as students at 16 schools where the dual credit course was offered with the Middle Tennessee State University, School of Agribusiness and Agriscience in the 2011-2012 academic year. A total of 245 students from 16 secondary agricultural programs in seven different school districts across Tennessee, primarily in the Middle Tennessee region, participated in the study for a response rate of approximately 45%. This study examined college readiness of student participation in an agricultural dual credit course and sought to determine the relationship between student participation in a dual credit course offering and college readiness self-efficacy as well as student perceptions of the course offering. Course self-efficacy was higher among dual credit participants versus non-dual credit participants. Social self-efficacy was also higher for dual credit participants. Females had higher Course self-efficacy, and there was a positive relationship between GPA and each construct of the college readiness self-efficacy inventory. Participant perceptions of the agricultural dual credit program were also high. This study indicates that dual credit participants can confidently approach post-secondary options, and that they are more likely to be successful in college due to level of self-efficacy as they matriculate into college. Recommendations from the study include: Using the MTSU dual credit model in future dual credit course developments and collaborations; using findings as a basis for training future agricultural education teachers on how to improve CRSE; and additional and longitudinal studies to track dual credit students’ success in college.

Neely, Alanna L.

2013-08-01T23:59:59.000Z

346

A dual-porosity reservoir model with a nonlinear coupling term  

DOE Green Energy (OSTI)

Since their introduction by Barenblatt et al. (1960), double-porosity models have been widely used for simulating flow in fractured reservoirs, such as geothermal reservoirs. In a dual-porosity system, the matrix blocks provide most of the storage of the reservoir, whereas the fractures provide the global transmissivity. Initially, most work on dual-porosity models emphasized the development of analytical solutions to idealized reservoir problems. Increasingly, the dual-porosity approach is being implemented by numerical reservoir simulators. Accurate numerical simulation of a dual-porosity problem often requires a prohibitively large number of computational cells in order to resolve the transient pressure gradients in the matrix blocks. We discuss a new dual-porosity model that utilizes a nonlinear differential equation to approximate the fracture/matrix interactions, When implemented into a numerical simulator, it eliminates the need to discretize the matrix blocks, and thereby allows more efficient simulation of reservoir problems.

Zimmerman, R.W.; Chen, G.; Hadgu, T.; Bodvarsson, G.S.

1992-09-01T23:59:59.000Z

347

A dual emission mechanism in Sgr A*/L' ?  

E-Print Network (OSTI)

We have collected in 2004 adaptive optics corrected L' images of the Galactic Center region with NAOS-CONICA at VLT. A strong variability was observed as well as a correlation between the photocenter positions and fluxes of the L'-band counterpart of Sgr A*. It is interpreted as the combined emission of a point-like flaring source at the position of Sgr A*/IR itself and an extended dust structure, 75 mas south west of Sgr A*/IR, which we name Sgr A*-f. We examine the different possible mechanisms to explain this dual Sgr A* L' emission and conclude it is likely a flaring emission associated to energetic events in the close environment of the black hole plus a quiescent emission resulting from the collision of Sgr A*-f by a jet from Sgr A*.

Yann Clénet; Daniel Rouan; Damien Gratadour; Olivier Marco; Pierre Léna; Nancy Ageorges; Eric Gendron

2005-07-05T23:59:59.000Z

348

Dual manifold system and method for fluid transfer  

DOE Patents (OSTI)

A dual-manifold assembly is provided for the rapid, parallel transfer of liquid reagents from a microtiter plate to a solid state microelectronic device having biological sensors integrated thereon. The assembly includes aspiration and dispense manifolds connected by a plurality of conduits. In operation, the aspiration manifold is actuated such that the aspiration manifold is seated onto an array of reagent-filled wells of the microtiter plate. The wells are pressurized to force reagent through conduits toward the dispense manifold. A pressure pulse provided by a standard ink-jet printhead ejects nanoliter-to-picoliter droplets of reagent through an array of printhead orifices and onto test sites on the surface of the microelectronic device.

Doktycz, Mitchel J. (Knoxville, TN); Bryan, William Louis (Knoxville, TN); Kress, Reid (Oak Ridge, TN)

2003-05-27T23:59:59.000Z

349

Nuclear dual-purpose plants for industrial energy  

SciTech Connect

One of the major obstacles to extensive application of nuclear power to industrial heat is the difference between the relatively small energy requirements of individual industrial plants and the large thermal capacity of current power reactors. A practical way of overcoming this obstacle would be to operate a centrally located dual-purpose power plant that would furnish process steam to a cluster of industrial plants, in addition to generating electrical power. The present study indicates that even relatively remote industrial plants could be served by the power plant, since it might be possible to convey steam economically as much as ten miles or more. A survey of five major industries indicates a major potential market for industrial steam from large nuclear power stations.

Klepper, O.H.

1976-01-01T23:59:59.000Z

350

Dual annular rotating "windowed" nuclear reflector reactor control system  

DOE Patents (OSTI)

A nuclear reactor control system is provided in a nuclear reactor having a core operating in the fast neutron energy spectrum where criticality control is achieved by neutron leakage. The control system includes dual annular, rotatable reflector rings. There are two reflector rings: an inner reflector ring and an outer reflector ring. The reflectors are concentrically assembled, surround the reactor core, and each reflector ring includes a plurality of openings. The openings in each ring are capable of being aligned or non-aligned with each other. Independent driving means for each of the annular reflector rings is provided so that reactor criticality can be initiated and controlled by rotation of either reflector ring such that the extent of alignment of the openings in each ring controls the reflection of neutrons from the core.

Jacox, Michael G. (Idaho Falls, ID); Drexler, Robert L. (Idaho Falls, ID); Hunt, Robert N. M. (Idaho Falls, ID); Lake, James A. (Idaho Falls, ID)

1994-01-01T23:59:59.000Z

351

Matrix-fracture interactions in dual porosity simulation  

DOE Green Energy (OSTI)

A new method for simulating flow in fractured media is presented which uses a truncated version of the analytical solution to resolve pressure transients in the rock matrix. The point at which the series solution may be truncated is a known function of the problem, and may therefore be readily determined. Furthermore, the functional form of the method is essentially dimension-independent, and implementation of the method requires only minimal modification to an existing dual porosity simulator. Three test cases are presented comparing results from fine grid simulations, Warren and Root simulations, and the new formulation. In each of the three cases presented, excellent agreement with the fine grid simulations is obtained using the new method. The W&R formulation exhibits excessive error throughout the simulated time, first underpredicting outflow rates, and then overpredicting rates. The error using the W&R formulation is largest for 3-D fracture networks, but is large for all cases tested.

Shook, G.M.

1996-01-01T23:59:59.000Z

352

Dual-transponder Precision Navigation System for Synthetic Aperture Sonar  

E-Print Network (OSTI)

The technical details of a dual-transponder, long-baseline positioning system to measure the sway of a free towed Synthetic Aperture Sonar (SAS) are presented. The sway is measured with respect to freely deployed, battery powered, transponders which sit stationary on the seabed connected via cables to floating buoys housing high-accuracy GPS timing receivers. A T/R switch allows a single hydrophone on each transponder to alternately receive and transmit linear FM chirp signals. The time of flight of the signals is determined by matched-filtering using a DSP and transmitted to the towboat for storage in real time using RF modems. The sway information is completely independent for each sonar ping and allows the deblurring of the SAS images by post processing. A Matlab simulation predicts a worst case sway accuracy of cm.

E N Pilbrow; M P Hayes; P T Gough

2002-01-01T23:59:59.000Z

353

Schwinger type processes via branes and their gravity duals  

E-Print Network (OSTI)

We consider Schwinger type processes involving the creation of the charge and monopole pairs in the external fields and propose interpretation of these processes via corresponding brane configurations in Type IIB string theory. We suggest simple description of some new interesting nonperturbative processes like monopole/dyon transitions in the electric field and W-boson decay in the magnetic field using the brane language. Nonperturbative pair production in the strong coupling regime using the AdS/CFT correspondence is studied. The treatment of the similar processes in the noncommutative theories when noncommutativity is traded for the background fields is presented and the possible role of the critical magnetic field which is S-dual to the critical electric field is discussed.

A. S. Gorsky; K. A. Saraikin; K. G. Selivanov

2001-10-19T23:59:59.000Z

354

Schwinger type processes via branes and their gravity duals  

E-Print Network (OSTI)

We consider Schwinger type processes involving the creation of the charge and monopole pairs in the external fields and propose interpretation of this processes via corresponding brane configurations in Type IIB string theory. We suggest simple description of some new interesting nonperturbative processes like monopole/dyon transitions in the electric field and W-boson decay in the magnetic field using the brane language. Nonperturbative pair production in the strong coupling regime using the AdS/CFT correspondence is studied. The treatment of the similar processes in the noncommutative theories where noncommutativity is traded for the background fields is presented and the possible role of the critical magnetic field which is S-dual to the critical electric field is discussed.

Gorsky, A S; Selivanov, K G

2002-01-01T23:59:59.000Z

355

Dual Phase Membrane for High Temperature CO2 Separation  

SciTech Connect

Dual-phase membranes consisting of stainless steel supports infiltrated with molten carbonate have been shown to be selective to CO{sub 2} at high temperatures (400-650 C). However, over time at high temperatures, the formation of iron oxides on the surface of the stainless steel supports render the membranes ineffective. This report details synthesis and characteristics of dual-phase carbonate membrane with an oxidation resistant perovskite type ceramic (lanthanum-strontium-cobaltite-iron; LSCF) support. Porous LSCF supports were prepared from its powder synthesized by the citrate method. Both steady state permeation and mercury porosimetry confirmed that the LSCF membrane sintered at 900 C has pores large enough to absorb molten carbonate, yet small enough to retain the molten carbonate under high pressure conditions. Results of XRD analysis have shown that LSCF and the molten carbonate mixture do not react with each other at temperatures below 700 C. Four-point method conductivity tests indicate that the support material has sufficiently high electronic conductivity for this application. Li-Na-K carbonate was coated to the porous LSCF support by a liquid infiltration method. Helium permeance of the support before and after infiltration of molten carbonate are on the order of 10{sup -6} and 10{sup -10} moles/m{sup 2} {center_dot} Pa {center_dot} s respectively, indicating that the molten carbonate is able to sufficiently infiltrate the membrane. Preliminary high temperature permeation experiments indicate that the membrane does separate CO{sub 2} in the presence of O{sub 2}, with a maximum flux of 0.623 ml/cm{sup 2} {center_dot} min obtained at 850 C.

Jerry Y.S. Lin; Matthew Anderson

2006-09-29T23:59:59.000Z

356

The NERSC CAM README file  

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

decomposition and communication layer Parallel Library for Grid Manipulations (PILGRIM), source and build files for which are located in camrootmodelsutilspilgrim....

357

Investigation of the Fundamental Reliability Unit for Cu Dual-Damascene Metallization  

E-Print Network (OSTI)

An investigation has been carried out to determine the fundamental reliability unit of copper dual-damascene metallization. Electromigration experiments have been carried out on straight via-to-via interconnects in the ...

Gan, C.L.

358

Dual-Polarization Spectral Analysis for Retrieval of Effective Raindrop Shapes  

Science Conference Proceedings (OSTI)

Dual-polarization radar observations of precipitation depend on size–shape relations of raindrops. There are several studies presented in literature dedicated to the investigation of this relation. In this work a new approach of investigating ...

D. N. Moisseev; V. Chandrasekar; C. M. H. Unal; H. W. J. Russchenberg

2006-12-01T23:59:59.000Z

359

Preliminary Report on Dual-Purpose Canister Disposal Alternatives (FY13) |  

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

Preliminary Report on Dual-Purpose Canister Disposal Alternatives Preliminary Report on Dual-Purpose Canister Disposal Alternatives (FY13) Preliminary Report on Dual-Purpose Canister Disposal Alternatives (FY13) This report documents the first phase of a multi-year project to understand the technical feasibility and logistical implications of direct disposal of spent nuclear fuel (SNF) in existing dual-purpose canisters (DPCs) and other types of storage casks. The first phase includes a set of preliminary disposal concepts and associated technical analyses, identification of additional R&D needs, and a recommendation to proceed with the next phase of the evaluation effort. Preliminary analyses indicate that DPC direct disposal could be technically feasible, at least for certain disposal concepts. DPC disposal concepts include the salt concept, and emplacement

360

Photo of the Week: The First Energy-Efficient Dual-Paned Windows |  

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

The First Energy-Efficient Dual-Paned Windows The First Energy-Efficient Dual-Paned Windows Photo of the Week: The First Energy-Efficient Dual-Paned Windows December 5, 2013 - 12:53pm Addthis Researchers at Berkeley Lab helped develop the first energy-efficient dual-paned windows, now used in buildings and homes worldwide for billions of dollars in energy savings. Current windows research in the Environmental Energy Technologies Division at Berkeley Lab is aimed at developing new glazing materials, windows simulation software and other advanced high-performance window systems. The building shown here, located at Berkeley Lab, is a windows testing facility. | Photo courtesy of Roy Kaltschmidt, Lawrence Berkeley National Laboratory. Researchers at Berkeley Lab helped develop the first energy-efficient

Note: This page contains sample records for the topic "dual overhead cam" 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

Kinetic Energy Budgets of a Subtropical Squall Line Determined from TAMEX Dual-Doppler Measurements  

Science Conference Proceedings (OSTI)

Dual-Doppler data collected during the Taiwan Area Mesoscale Experiment (TAMEX) are used to study the kinetic energy balance of a subtropical squall line over the Taiwan Straits. Values of each term in the kinetic energy budget equation are ...

Yeong-Jer Lin; Hsi Shen; Robert W. Pasken

1991-11-01T23:59:59.000Z

362

Retrieval of Microscale Wind and Temperature Fields from Single- and Dual-Doppler Lidar Data  

Science Conference Proceedings (OSTI)

Dual-Doppler lidar observations are used to assess the accuracy of single-Doppler retrievals of microscale wind and temperature fields in a shear-driven convective boundary layer. The retrieval algorithm, which is based on four-dimensional ...

Rob K. Newsom; David Ligon; Ron Calhoun; Rob Heap; Edward Cregan; Marko Princevac

2005-09-01T23:59:59.000Z

363

Dual-Regression Retrieval Algorithm for Real-Time Processing of Satellite Ultraspectral Radiances  

Science Conference Proceedings (OSTI)

A fast physically based dual-regression (DR) method is developed to produce, in real time, accurate profile and surface- and cloud-property retrievals from satellite ultraspectral radiances observed for both clear- and cloudy-sky conditions. The ...

William L. Smith Sr.; Elisabeth Weisz; Stanislav V. Kireev; Daniel K. Zhou; Zhenglong Li; Eva E. Borbas

2012-08-01T23:59:59.000Z

364

A Study of Embryo Production and Hail Growth Using Dual-Doppler and Multiparameter Radars  

Science Conference Proceedings (OSTI)

The origin and importance to embryo and hail production of a region of drops advected above the freezing level in the updraft of a severe Colorado hailstorm is examined using radar polarization measurements in conjunction with dual-Doppler and ...

John W. Conway; Dušan S. Zrni?

1993-09-01T23:59:59.000Z

365

Dual-temperature Kalina cycle for geothermal-solar hybrid power systems  

E-Print Network (OSTI)

This thesis analyzes the thermodynamics of a power system coupling two renewable heat sources: low-temperature geothermal and a high-temperature solar. The process, referred to as a dual-temperature geothermal-solar Kalina ...

Boghossian, John G

2011-01-01T23:59:59.000Z

366

Extended Overdetermined Dual-Doppler Formalism in Synthesizing Airborne Doppler Radar Data  

Science Conference Proceedings (OSTI)

During the intensive observing period of the field phase of the Coupled Ocean–Atmosphere Response Experiment (COARE) of the Tropical Oceans and Global Atmosphere (TOGA) program, airborne Doppler radars capable of fore–aft scanning (dual-Doppler ...

Michel Chong; Cláudia Campos

1996-06-01T23:59:59.000Z

367

Quantitative Precipitation Estimation in the CASA X-band Dual-Polarization Radar Network  

Science Conference Proceedings (OSTI)

This paper presents the sensing aspects and performance evaluation of the quantitative precipitation estimation (QPE) system in an X-band dual-polarization radar network developed by the Collaborative Adaptive Sensing of the Atmosphere (CASA) ...

Yanting Wang; V. Chandrasekar

2010-10-01T23:59:59.000Z

368

Vector Winds from a Single-Transmitter Bistatic Dual-Doppler Radar Network  

Science Conference Proceedings (OSTI)

A bistatic dual-Doppler weather radar network consisting of only one transmitter and a nontransmitting, nonscanning, low-cost bistatic receiver was deployed in the Boulder, Colorado, area during 1993.

Joshua Wurman

1994-06-01T23:59:59.000Z

369

Development of Dual-Air-Assistant Atomizing Nozzle to Apply Aerosol...  

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

Development of Dual-Air-Assistant Atomizing Nozzle to Apply Aerosol-Sealing Technology in Air Duct Systems Speaker(s): Alan Ropers Date: July 8, 2002 - 12:00pm Location: Bldg. 90...

370

Tornado Maintenance Investigated with High-Resolution Dual-Doppler and EnKF Analysis  

Science Conference Proceedings (OSTI)

Dual-Doppler wind synthesis and ensemble Kalman filter analyses produced by assimilating Doppler-on-Wheels velocity data collected in four tornadic supercells are examined in order to further understand the maintenance of tornadoes. Although ...

James Marquis; Yvette Richardson; Paul Markowski; David Dowell; Joshua Wurman

2012-01-01T23:59:59.000Z

371

Improving the LP bound of a MILP by dual concurrent branching and ...  

E-Print Network (OSTI)

Transformed to the dual space in the textbook standard way, we get: g1 : y1 + ... In 2.1 we call those inequalities, where the right hand side is greater 0 the main.

372

A Computational Study into the Evolution of Dual-Route Dynamics for Affective Processing  

Science Conference Proceedings (OSTI)

The evolutionary justification by LeDoux (1996) for his dual-route model of fear processing was analyzed computationally by applying genetic algorithms to artificial neural networks. The evolution was simulated of a neural network controlling an agent ...

Paul Den Dulk; Bram T. Heerebout; R. Hans Phaf

2003-02-01T23:59:59.000Z

373

Dual Estimates of the Optimal Plan Model and Regional Market Costs: A Relationship  

Science Conference Proceedings (OSTI)

The relationship between linear programming dual estimates for the optimal production plan model and real regional market costs is studied. A two-stage linear programming model is necessary for exact approximation of cost allocation in analyzing with ...

Yu. M. Tsodikov; Ya. Yu. Tsodikova

2001-04-01T23:59:59.000Z

374

Scopes and Challenges of Dual-Doppler Lidar Wind Measurements—An Error Analysis  

Science Conference Proceedings (OSTI)

Pulsed Doppler lidars are powerful tools for long-range high-resolution measurements of radial wind velocities. With the development of commercial Doppler lidars and the reduction of acquisition costs, dual-Doppler lidar systems will be become ...

Christina Stawiarski; Katja Träumner; Christoph Knigge; Ronald Calhoun

375

High-Resolution Dual-Doppler Analyses of the 29 May 2001 Kress, Texas, Cyclic Supercell  

Science Conference Proceedings (OSTI)

On 29 May 2001, Doppler on Wheels radars collected data on a supercell near Kress, Texas. The supercellular storm, cyclic in nature, produced multiple mesocyclones throughout its lifetime. Dual-Doppler syntheses were conducted using a grid ...

Jeffrey R. Beck; John L. Schroeder; Joshua M. Wurman

2006-11-01T23:59:59.000Z

376

The Structure of Thermals in Cumulus from Airborne Dual-Doppler Radar Observations  

Science Conference Proceedings (OSTI)

A newly developed technique for airborne dual-Doppler observations with the Wyoming Cloud Radar is used to characterize the velocity fields in vertical planes across cumulus turrets. The clouds sampled were continental in nature, with high bases (...

Rick Damiani; Gabor Vali; Samuel Haimov

2006-05-01T23:59:59.000Z

377

High Resolution Hurricane Vector Winds from C-band Dual-Polarization SAR Observations  

Science Conference Proceedings (OSTI)

This study presents a new approach for retrieving hurricane surface wind vectors utilizing C-band dual-polarization (VV, VH) synthetic aperture radar (SAR) observations. The co-polarized geophysical model function (CMOD5.N) and a new cross-...

Biao Zhang; William Perrie; Jun A. Zhang; Eric W. Uhlhorn; Yijun He

378

The Genesis of Three Nonsupercell Tornadoes Observed with Dual-Doppler Radar  

Science Conference Proceedings (OSTI)

Dual-Doppler radar analyses of three tornadoes associated with a multicellular line of storms are presented. The F2–F3 intensity tornadoes occurred on 15 June 1988 near Denver, Colorado, during the Terminal Doppler Weather Radar (TDWR) Project. ...

Rita D. Roberts; James W. Wilson

1995-12-01T23:59:59.000Z

379

A Phase Field Study on Static Strain Aging Kinetics of Dual Phase ...  

Science Conference Proceedings (OSTI)

In the current study, we found that the time scale for strain aging of a dual-phase linepipe steel is several orders of magnitude longer than that needed for ...

380

Sources of Error in Dual-Wavelength Radar Remote Sensing of Cloud Liquid Water Content  

Science Conference Proceedings (OSTI)

Dual-wavelength ratio (DWR) techniques offer the prospect of producing high-resolution mapping of cloud microphysical properties, including retrievals of cloud liquid water content (LWC) from reflectivity measured by millimeter-wavelength radars. ...

John K. Williams; J. Vivekanandan

2007-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "dual overhead cam" 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

A Study on the Feasibility of Dual-Wavelength Radar for Identification of Hydrometeor Phases  

Science Conference Proceedings (OSTI)

An important objective for the dual-wavelength Ku-/Ka-band precipitation radar (DPR) that will be on board the Global Precipitation Measurement (GPM) core satellite is to identify the phase state of hydrometeors along the range direction. To ...

Liang Liao; Robert Meneghini

2011-02-01T23:59:59.000Z

382

Single- and Dual-Source Modeling of Surface Energy Fluxes with Radiometric Surface Temperature  

Science Conference Proceedings (OSTI)

Single- and dual-source models of the surface energy transfer across the soil-vegetation-atmosphere interface were used in conjunction with remotely sensed surface temperature for computing the surface energy balance over heterogeneous surfaces. ...

W. P. Kustas; K. S. Humes; J. M. Norman; M. S. Moran

1996-01-01T23:59:59.000Z

383

Observations of a Tropical Thunderstorm Using a Vertically Pointing, Dual-Frequency, Collinear Beam Doppler Radar  

Science Conference Proceedings (OSTI)

This paper describes an investigation of a thunderstorm that occurred in the summer of 1991 over the National Astronomy and Ionosphere Center in Arecibo, Puerto Rico. Observations were made using collinear dual-wavelength Doppler radars, which ...

P. B. Chilson; C. W. Ulbrich; M. F. Larsen; P. Perillat; J. E. Keener

1993-10-01T23:59:59.000Z

384

Improving energy saving in hard real time systems via a modified dual priority scheduling  

Science Conference Proceedings (OSTI)

In this paper, we present a modification of the Dual Priority scheduling algorithm, for hard real-time systems, that takes advantage of its performance to efficiently improve energy saving. The approach exploit the priority scheme to lengthen the runtime ...

M. Angels Moncusi; Alex Arenas; Jesus Labarta

2001-12-01T23:59:59.000Z

385

Dual-band ultraviolet-short-wavelength infrared imaging via luminescent downshifting with colloidal quantum dots  

E-Print Network (OSTI)

The performance of short-wavelength infrared (SWIR) cameras in the visible and ultraviolet (UV) regions is limited by the absorption of high-energy photons in inactive regions of the imaging array. Dual-band UV-SWIR imaging ...

Geyer, Scott M.

386

A New Dual-Polarization Radar Rainfall Algorithm: Application in Colorado Precipitation Events  

Science Conference Proceedings (OSTI)

The efficacy of dual-polarization radar for quantitative precipitation estimation (QPE) has been demonstrated in a number of previous studies. Specifically, rainfall retrievals using combinations of reflectivity (Zh), differential reflectivity (Z...

R. Cifelli; V. Chandrasekar; S. Lim; P. C. Kennedy; Y. Wang; S. A. Rutledge

2011-03-01T23:59:59.000Z

387

Comparison of Dual-Polarization Radar Measurements of Rain with Ground-Based Disdrometer Measurements  

Science Conference Proceedings (OSTI)

Dual-polarization radar measurements of ZH and ZDR, where ZDR = 10 logZH/ZV and ZH, ZV are the radar reflectivity factors for horizontal and vertical polarizations, respectively, are compared with values derived from raindrop-size distributions ...

J. W. F. Goddard; S. M. Cherry; V. N. Bringi

1982-02-01T23:59:59.000Z

388

Source book for planning nuclear dual-purpose electric/distillation desalination plants  

SciTech Connect

A source book on nuclear dual-purpose electric/distillation desalination plants was prepared to assist government and other planners in preparing broad evaluations of proposed applications of dual-purpose plants. The document is divided into five major sections. Section 1 presents general discussions relating to the benefits of dual-purpose plants, and spectrum for water-to-power ratios. Section 2 presents information on commercial nuclear plants manufactured by US manufacturers. Section 3 gives information on distillation desalting processes and equipment. Section 4 presents a discussion on feedwater pretreatment and scale control. Section 5 deals with methods for coupling the distillation and electrical generating plants to operate in the dual mode.

Reed, S.A.

1981-02-01T23:59:59.000Z

389

Retrieval of Raindrop Size Distribution from Simulated Dual-Frequency Radar Measurements  

Science Conference Proceedings (OSTI)

Observations of raindrop size distributions (DSDs) have validated the use of three-parameter distribution functions in representing the observed spectra. However, dual-frequency radar measurements are limited to retrieving two independent ...

S. Joseph Munchak; Ali Tokay

2008-01-01T23:59:59.000Z

390

Aspects of Convective Boundary Layer Turbulence Measured by a Dual-Doppler Lidar System  

Science Conference Proceedings (OSTI)

Special designed dual-Doppler setups can be used to retrieve simultaneous measurements of two wind components with high temporal resolution in several heights throughout the atmospheric boundary layer. During a field campaign in summer 2011, ...

Luisa Röhner; Katja Träumner

2013-09-01T23:59:59.000Z

391

Volume Scanning Strategies for 3D Wind Retrieval from Dual-Doppler Lidar Measurements  

Science Conference Proceedings (OSTI)

Dual-Doppler lidar volume scans for 3D wind retrieval must accommodate the conflicting goals of dense spatial coverage and short scan duration. In this work, various scanning strategies are evaluated with semisynthetic wind fields from analytical ...

Susanne Drechsel; Georg J. Mayr; Michel Chong; Fotini K. Chow

2010-11-01T23:59:59.000Z

392

Scopes and Challenges of Dual-Doppler Lidar Wind Measurements—An Error Analysis  

Science Conference Proceedings (OSTI)

Pulsed Doppler lidars are powerful tools for long-range, high-resolution measurements of radial wind velocities. With the development of commercial Doppler lidars and the reduction of acquisition costs, dual-Doppler lidar systems will be become ...

Christina Stawiarski; Katja Träumner; Christoph Knigge; Ronald Calhoun

2013-09-01T23:59:59.000Z

393

Dual-Doppler Analysis of Winds and Vorticity Budget Terms near a Tornado  

Science Conference Proceedings (OSTI)

Three-dimensional dual-Doppler observations with unprecedented finescale spatial and temporal resolution are used to characterize the vector wind field and vorticity generation terms in and near a weak, short-lived tornado. The beam widths of the ...

Joshua Wurman; Yvette Richardson; Curtis Alexander; Stephen Weygandt; Peng Fei Zhang

2007-06-01T23:59:59.000Z

394

Use of a Vertical Vorticity Equation in Variational Dual-Doppler Wind Analysis  

Science Conference Proceedings (OSTI)

The utility of the anelastic vertical vorticity equation in a weak-constraint (least squares error) variational dual-Doppler wind analysis procedure is explored. The analysis winds are obtained by minimizing a cost function accounting for the ...

Alan Shapiro; Corey K. Potvin; Jidong Gao

2009-10-01T23:59:59.000Z

395

The Use of Simultaneous Horizontal and Vertical Transmissions for Dual-Polarization Radar Meteorological Observations  

Science Conference Proceedings (OSTI)

Observations are presented in which the standard dual-polarization meteorological quantities (ZDR, dp, and ?HV) are determined from simultaneous horizontal (H) and vertical (V) transmissions. The return signals are measured in parallel H and V ...

Richard D. Scott; Paul R. Krehbiel; William Rison

2001-04-01T23:59:59.000Z

396

Gender ideology: impact on dual-career couples' role strain, marital satisfaction, and life satisfaction  

E-Print Network (OSTI)

With dual-career couples comprising the most common family type, it is important for mental health professionals, employers, and policy makers to understand the unique challenges of this population (Haddock et al., 2001; Saginak & Saginak, 2005.) Numerous researchers have studied the consequences of family and work role strain for dual-career couples. However, when dual-career couples are able to share responsibilities and negotiate degendered roles they experience the benefits of dual-career couples. The literature clearly supports the importance of egalitarian roles for marital satisfaction and life satisfaction of dual-career couples. While researchers have studied social role strain, gender role strain, marital satisfaction, and life satisfaction and discussed the importance of degendered roles and responsibilities for dual-career couples, no studies have examined gender ideology. Saginak and Saginak (2005) called for researchers to investigate how gender ideologies and the gender socialization process perpetuate the challenges faced by dual-career couples in balancing work and family. This study investigated the associations between gender ideology and gender role strain, job-family role strain, marital satisfaction, and life satisfaction among 70 individual members of dual-career couples. A multivariate analysis of variance was utilized to investigate the relationship between gender ideology and the criterion measures. Gender ideology was partially associated with gender role strain with the androgynous gender ideology group scoring significantly lower on gender role strain than the masculine or undifferentiated gender ideology groups but not significantly lower than the feminine gender ideology group. Gender ideology was not associated with job-family role strain or marital satisfaction. In addition, gender ideology was also partially associated with life satisfaction with the androgynous gender ideology group scoring significantly higher on quality of life than the masculine or undifferentiated gender ideology groups but not significantly higher than the feminine gender ideology group. Thus, the current study indicates there are partial associations between gender ideology and gender role strain and life satisfaction for dual-career couples. Mental health professionals, employers, and policy makers working with dual-career couples should assess the socially constructed gender norms and expectations internalized by individuals into a gender ideology as the possible source of challenges experienced by the dual-career couple.

King, Jennifer Jean

2005-12-01T23:59:59.000Z

397

Dual to ratio-cumproduct estimator using known parameters of auxiliary variables  

E-Print Network (OSTI)

This paper deals with the dual to ratio-cum-product estimator for population mean using known parameters of auxiliary variables. In this paper, dual to ratio-cum-product estimator of Singh and Tailor (2005) has been suggested. The Bias and mean squared error expressions have also been obtained up to the first degree of approximation. Suggested estimator has been compared theoretically as well as empirically.

Rajesh Tailor; Ritesh Tailor; Rajesh Parmar; Manish Kumar

2012-01-01T23:59:59.000Z

398

Producing thin film photovoltaic modules with high integrity interconnects and dual layer contacts  

DOE Patents (OSTI)

High performance photovoltaic modules are produced with improved interconnects by a special process. Advantageously, the photovoltaic modules have a dual layer back (rear) contact and a front contact with at least one layer. The front contact and the inner layer of the back contact can comprise a transparent conductive oxide. The outer layer of the back contact can comprise a metal or metal oxide. The front contact can also have a dielectric layer. In one form, the dual layer back contact comprises a zinc oxide inner layer and an aluminum outer layer and the front contact comprises a tin oxide inner layer and a silicon dioxide dielectric outer layer. One or more amorphous silicon-containing thin film semiconductors can be deposited between the front and back contacts. The contacts can be positioned between a substrate and an optional superstrate. During production, the transparent conductive oxide layer of the front contact is scribed by a laser, then the amorphous silicon-containing semiconductors and inner layer of the dual layer back contact are simultaneously scribed and trenched (drilled) by the laser and the trench is subsequently filled with the same metal as the outer layer of the dual layer back contact to provide a superb mechanical and electrical interconnect between the front contact and the outer layer of the dual layer back contact. The outer layer of the dual layer back contact can then be scribed by the laser. For enhanced environmental protection, the photovoltaic modules can be encapsulated.

Jansen, Kai W. (Lawrenceville, NJ); Maley, Nagi (Exton, PA)

2000-01-01T23:59:59.000Z

399

Producing thin film photovoltaic modules with high integrity interconnects and dual layer contacts  

DOE Patents (OSTI)

High performance photovoltaic modules are produced with improved interconnects by a special process. Advantageously, the photovoltaic modules have a dual layer back (rear) contact and a front contact with at least one layer. The front contact and the inner layer of the back contact can comprise a transparent conductive oxide. The outer layer of the back contact can comprise a metal or metal oxide. The front contact can also have a dielectric layer. In one form, the dual layer back contact comprises a zinc oxide inner layer and an aluminum outer layer and the front contact comprises a tin oxide inner layer and a silicon dioxide dielectric outer layer. One or more amorphous silicon-containing thin film semiconductors can be deposited between the front and back contacts. The contacts can be positioned between a substrate and an optional superstrate. During production, the transparent conductive oxide layer of the front contact is scribed by a laser, then the amorphous silicon-containing semiconductors and inner layer of the dual layer back contact are simultaneously scribed and trenched (drilled) by the laser and the trench is subsequently filled with the same metal as the outer layer of the dual layer back contact to provide a superb mechanical and electrical interconnect between the front contact and the outer layer of the dual layer back contact. The outer layer of the dual layer back contact can then be scribed by the laser. For enhanced environmental protection, the photovoltaic modules can be encapsulated.

Jansen, Kai W. (Lawrenceville, NJ); Maley, Nagi (Exton, PA)

2001-01-01T23:59:59.000Z

400

Dual-phase membrane for High temperature CO2 separation  

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

Jerry Y.S. Lin Jerry Y.S. Lin Chemical Engineering Arizona State University Tempe, AZ 85287 Jerry.lin@asu.edu Pre-Combustion Carbon Dioxide Capture by a New Dual-Phase Ceramic-Carbonate Membrane Reactor 2 Background 3 CO 2 Capture Methods and Efficiency Improvement Coal, Natural gas, Biomass CO 2 separation Power plant CO 2 compression, conditioning for sequestration Gasification Reforming Shift CO 2 Separation Power plant Power plant Air separation N 2 /O 2 CO 2 Post- combustion H 2 /CO H 2 /CO H 2 CO 2 H 2 O/N 2 /O 2 CO 2 H 2 Pre- combustion Air N 2 O 2 or O 2 /CO 2 CO 2 Oxyfuel Combustion Air separation Air Air separation Air Air separation Air Air Air Air Air separation Air Air separation Air N 2 Air separation Air O 2 or O 2 /CO 2 N 2 Air separation Air N 2 Air O 2 or O 2 /CO 2 N 2 Air Air separation N 2 Air 4 Water-Gas-Shift Reaction and Membrane Reactor Reforming

Note: This page contains sample records for the topic "dual overhead cam" 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

Dual curvature acoustically damped concentrating collector. Final technical report  

DOE Green Energy (OSTI)

A development program was conducted to investigate the design and performance parameters of a novel, dual curvature, concentrating solar collector. The reflector of the solar collector is achieved with a stretched-film reflective surface that approximates a hyperbolic paraboloid and is capable of line-focusing at concentration ratios ranging from 10 to 20X. A prototype collector was designed based on analytical and experimental component trade-off activities as well as economic analyses of solar thermal heating and cooling systems incorporating this type of collector. A prototype collector incorporating six 0.66 x 1.22 m (2 x 4 ft) was fabricated and subjected to a limited thermal efficiency test program. A peak efficiency of 36% at 121/sup 0/C (250/sup 0/F) was achieved based upon the gross aperture area. Commercialization activities were conducted, including estimated production costs of $134.44/m/sup 2/ ($12.49/ft/sup 2/) for the collector assembly (including a local suntracker and controls) and $24.33/m/sup 2/ ($2.26/ft/sup 2/) for the reflector subassembly.

Smith, G.A.; Rausch, R.A.

1980-05-01T23:59:59.000Z

402

VHISPER: a high speed dual mode VLIW and Superscalar Processor  

E-Print Network (OSTI)

Considerable effort has gone into streamlining the logic in pipelined processors. Further Increases in speed for a pipelined processor will probably come about from. either increasing the pipeline depth, superpipelining or increasing the width of tile datapath or control path. The later can be achieved by either issuing more than one instruction per cycle, Superscalar, or by using a VLIW (Very Long Instruction Word) architecture in which many operations are performed in parallel by a single instruction. To achieve an overall gain in performance, significant increases in speed must be accompanied) by highly utilized resources. Idle resources contribute little to performance while increasing overall system costs and power consumption. As pipeline depth increases, a single instruction stream call riot keep all tile pipeline stages in a processor fully utilized. Control and data dependencies within the instruction stream limit the number of instructions that can be active for a given instruction stream. So better functional utilization can be achieved by using instructions from multiple streams. A new instruction issue scheme using multiple threads is presented for a dual mode processor. VHISPER, VLIW High speed Superscale Processor. The scheme is designed to increase throughout and maintain a fairly resource utilization. A multithread VHISPER architecture is modeled in Verilog and the instruction issue scheme is tested on this model. Obtained results indicate that VHISPER performs 43% better in the VLIW mode than in the 2nd degree Superscalar mode and 25 % better than in the 3rd degree Superscale mode.

Mellacheruvu, Rajesh Kumar

1994-01-01T23:59:59.000Z

403

Dual-etalon, cavity-ring-down, frequency comb spectroscopy.  

Science Conference Proceedings (OSTI)

The 'dual etalon frequency comb spectrometer' is a novel low cost spectometer with limited moving parts. A broad band light source (pulsed laser, LED, lamp ...) is split into two beam paths. One travels through an etalon and a sample gas, while the second arm is just an etalon cavity, and the two beams are recombined onto a single detector. If the free spectral ranges (FSR) of the two cavities are not identical, the intensity pattern at the detector with consist of a series of heterodyne frequencies. Each mode out of the sample arm etalon with have a unique frequency in RF (radio-frequency) range, where modern electronics can easily record the signals. By monitoring these RF beat frequencies we can then determine when an optical frequencies is absorbed. The resolution is set by the FSR of the cavity, typically 10 MHz, with a bandwidth up to 100s of cm{sup -1}. In this report, the new spectrometer is described in detail and demonstration experiments on Iodine absorption are carried out. Further we discuss powerful potential next generation steps to developing this into a point sensor for monitoring combustion by-products, environmental pollutants, and warfare agents.

Strecker, Kevin E.; Chandler, David W.

2010-10-01T23:59:59.000Z

404

Indirect-fired gas turbine dual fuel cell power cycle  

DOE Patents (OSTI)

A fuel cell and gas turbine combined cycle system which includes dual fuel cell cycles combined with a gas turbine cycle wherein a solid oxide fuel cell cycle operated at a pressure of between 6 to 15 atms tops the turbine cycle and is used to produce CO.sub.2 for a molten carbonate fuel cell cycle which bottoms the turbine and is operated at essentially atmospheric pressure. A high pressure combustor is used to combust the excess fuel from the topping fuel cell cycle to further heat the pressurized gas driving the turbine. A low pressure combustor is used to combust the excess fuel from the bottoming fuel cell to reheat the gas stream passing out of the turbine which is used to preheat the pressurized air stream entering the topping fuel cell before passing into the bottoming fuel cell cathode. The CO.sub.2 generated in the solid oxide fuel cell cycle cascades through the system to the molten carbonate fuel cell cycle cathode.

Micheli, Paul L. (Sacramento, CA); Williams, Mark C. (Morgantown, WV); Sudhoff, Frederick A. (Morgantown, WV)

1996-01-01T23:59:59.000Z

405

Ultracompact Vanadium Dioxide Dual-Mode Plasmonic Waveguide Electroabsorption Modulator  

E-Print Network (OSTI)

Subwavelength modulators play an indispensable role in integrated photonic-electronic circuits. Due to weak light-matter interactions, it is always a challenge to develop a modulator with a nanometer scale footprint, low switching energy, low insertion loss and large modulation depth. In this paper, we propose the design of a vanadium dioxide dual-mode plasmonic waveguide electroabsorption modulator using a metal-insulator-VO$_2$-insulator-metal (MIVIM) waveguide platform. By varying the index of vanadium dioxide, the modulator can route plasmonic waves through the low-loss dielectric insulator layer during the "on" state and high-loss VO$_2$ layer during the "off" state, thereby significantly reducing the insertion loss while maintaining a large modulation depth. This ultracompact waveguide modulator, for example, can achieve a large modulation depth of ~10dB with an active size of only 200x50x220nm$^3$ (or ~{\\lambda}$^3$/1700), requiring a drive-voltage of ~4.6V. This high performance plasmonic modulator co...

Ooi, Kelvin J A; Chu, Hong Son; Ang, Lay Kee

2013-01-01T23:59:59.000Z

406

Dual Permeability Modeling of Flow in a Fractured Geothermal Reservoir  

DOE Green Energy (OSTI)

A three dimensional fracture system synthesis and flow simulation has been developed to correlate drawdown characteristics measured in a geothermal well and to provide the basis for an analysis of tracer tests. A new dual permeability approach was developed which incorporates simulations at two levels to better represent a discrete fracture system within computer limitations. The first incorporates a discrete simulation of the largest fractures in the system plus distributed or representative element simulation of the smaller fractures. the second determines the representative element properties by discrete simulation of the smaller fractures. The fracture system was synthesized from acoustic televiewer data on the orientation and separation of three distinct fracture sets, together with additional data from the literature. Lognormal and exponential distributions of fracture spacing and radius were studied with the exponential distribution providing more reasonable results. Hydraulic apertures were estimated as a function of distance from the model boundary to a constant head boundary. Mean values of 6.7, 101 and 46 {micro}m were chosen as the most representative values for the three fracture sets. Recommendations are given for the additional fracture characterization needed to reduce the uncertainties in the model.

Miller, John D.; Allman, David W.

1986-01-21T23:59:59.000Z

407

Dual permeability modeling of flow in a fractured geothermal reservoir  

DOE Green Energy (OSTI)

A three dimensional fracture system synthesis and flow simulation has been developed to correlate drawdown characteristics measured in a geothermal well and to provide the basis for an analysis of tracer tests. A new dual permeability approach was developed which incorporates simulations at two levels to better represent a discrete fracture system within computer limitations. The first incorporates a discrete simulation of the largest fractures in the system plus distributed or representative element stimulation of the smaller fractures. The second determines the representative element properties by discrete simulation of the smaller fractures. The fracture system was synthesized from acoustic televiewer data on the orientation and separation of three distinct fracture sets, together with additional data from the literature. Lognormal and exponential distributions of fracture spacing and radius were studied with the exponential distribution providing more reasonable results. Hydraulic apertures were estimated as a function of distance from the model boundary to a constant head boundary. Mean values of 6.7, 101 and 46 ..mu..m were chosen as the most representative values for the three fracture sets. Recommendations are given for the additional fracture characterization needed to reduce the uncertainties in the model. 20 refs., 6 figs.

Miller, J.D.; Allman, D.W.

1986-01-01T23:59:59.000Z

408

Dual energy scanning beam laminographic x-radiography  

DOE Patents (OSTI)

A multiple x-ray energy level imaging system includes a scanning x-ray beam and two detector design having a first low x-ray energy sensitive detector and a second high x-ray energy sensitive detector. The low x-ray energy detector is placed next to or in front of the high x-ray energy detector. The low energy sensitive detector has small stopping power for x-rays. The lower energy x-rays are absorbed and converted into electrical signals while the majority of the higher energy x-rays pass through undetected. The high energy sensitive detector has a large stopping power for x-rays as well as it having a filter placed between it and the object to absorb the lower energy x-rays. In a second embodiment; a single energy sensitive detector is provided which provides an output signal proportional to the amount of energy in each individual x-ray it absorbed. It can then have an electronic threshold or thresholds set to select two or more energy ranges for the images. By having multiple detectors located at different positions, a dual energy laminography system is possible.

Majewski, Stanislaw (Grafton, VA); Wojcik, Randolph F. (Yorktown, VA)

1998-01-01T23:59:59.000Z

409

Dual energy scanning beam laminographic x-radiography  

DOE Patents (OSTI)

A multiple x-ray energy level imaging system includes a scanning x-ray beam and two detector design having a first low x-ray energy sensitive detector and a second high x-ray energy sensitive detector. The low x-ray energy detector is placed next to or in front of the high x-ray energy detector. The low energy sensitive detector has small stopping power for x-rays. The lower energy x-rays are absorbed and converted into electrical signals while the majority of the higher energy x-rays pass through undetected. The high energy sensitive detector has a large stopping power for x-rays as well as it having a filter placed between it and the object to absorb the lower energy x-rays. In a second embodiment; a single energy sensitive detector is provided which provides an output signal proportional to the amount of energy in each individual x-ray it absorbed. It can then have an electronic threshold or thresholds set to select two or more energy ranges for the images. By having multiple detectors located at different positions, a dual energy laminography system is possible. 6 figs.

Majewski, S.; Wojcik, R.F.

1998-04-21T23:59:59.000Z

410

Optimization of a dual acting, magnetically driven, linear actuator  

E-Print Network (OSTI)

In this study the geometry of a dual acting, magnetically driven, linear motion actuator will be optimized. This will be accomplished by modeling the system through a set of differential equations to be solved in Matlab. An ANSYS finite element program will be used to model the thermal response of the electrical coils so a maximum temperature can be found. These simulations will be part of a Matlab optimization routine. This routine will optimize the actuator's geometry by minimizing a cost function comprised of the floater displacement, the actuator weight, and the maximum coil temperature. Different simulations will be run, each with a unique set of operating parameters. These tests will be analyzed and an optimal configuration will be found. Once complete, a different approach in meeting the design objectives of a stroke length of at least 10 mils, a low maximum coil temperature and a low actuator weight, will be taken. Instead of optimizing the geometry, the rubber pads that are found between the ECOREs and the floater will be replaced by a classical PID type controller. The effects that this PID controller has on the actuator response in reference to the design objectives will be noted and discussed. During the geometrical optimization, an optimal configuration was found that increases the stroke length of the actuator from approximately 1.01 mils to 2.24 mils. However, by implementing a PID control scheme and keeping the rubber pads, with a stiffness of 2854 lb/in, in the system, this stroke length can be increased to 30 mils. It is recommended that the geometry be changed to geometry found in iteration 53 of optimization trial 4 in conjunction with a PID control scheme. This best satisfies the design objectives.

Willerton, Justin Ryan

2002-01-01T23:59:59.000Z

411

On a characterization of separable dual Banach spaces through determinant subspaces of attaining-norm linear forms  

E-Print Network (OSTI)

Necessary and sufficient conditions for a separable Banach space to be(isometrically isomorphic to) a dual space will be given.

Rossi, Stefano

2009-01-01T23:59:59.000Z

412

Retrieval of Precipitation Profiles from Airborne Radar and Passive Radiometer Measurements: Comparison with Dual-Frequency Radar Measurements  

Science Conference Proceedings (OSTI)

This study compares precipitation rate profiles derived from a single frequency radar and radiometer with such profiles derived from a dual-frequency radar.

J. A. Weinman; R. Meneghini; K. Nakamura

1990-10-01T23:59:59.000Z

413

DCPT v1.0 - New particle tracker for modeling transport in dual-continuum - User's Manual  

E-Print Network (OSTI)

Dual-Continuum Media User's Manual Lehua Pan, Hui Hai Liu,report serves as a user's manual of DCPT V1.0. It includes

Pan, Lehua; Liu, Hui Hai; Cushey, Mark; Bodvarsson, Gudmundur

2001-01-01T23:59:59.000Z

414

Dual molecular imaging for targeting metalloproteinase activity and apoptosis in atherosclerosis: molecular imaging facilitates understanding of pathogenesis  

E-Print Network (OSTI)

HC), who underwent dual radionuclide imaging with 99m Tc-16:753–62. ) Key Words: Radionuclides Æ SPECT Æ vulnerablevivo imaging protocols. Radionuclide imaging was performed

2009-01-01T23:59:59.000Z

415

Final joint environmental assessment for the construction and routine operation of a 12-kilovolt (KV) overhead powerline right-of-way, and formal authorization for a 10-inch and 8-inch fresh water pipeline right-of-way, Naval Petroleum Reserve No. 1, Kern County, California  

SciTech Connect

The purpose and need of the proposed action, which is the installation of an overhead powerline extension from an Naval Petroleum Reserve No. 1 (NPR-1) power source to the WKWD Station A, is to significantly reduce NPR-1`s overall utility costs. While the proposed action is independently justified on its own merits and is not tied to the proposed NPR-1 Cogeneration Facility, the proposed action would enable DOE to tie the NPR-1 fresh water pumps at Station A into the existing NPR-1 electrical distribution system. With the completion of the cogeneration facility in late 1994 or early 1995, the proposed action would save additional utility costs. This report deals with the environmental impacts of the construction of the powerline and the water pipeline. In addition, information is given about property rights and attaining permission to cross the property of proposed affected owners.

1994-10-01T23:59:59.000Z

416

Inspection report: the Department of Energy's export licensing process for dual-use and munitions commodities  

SciTech Connect

Export of commodities, encouraged by both the private sector and the Federal Government, helps to improve our position in the global economy and is in the national interest of the US. However, exports of commodities or technologies, without regard to whether they may significantly contribute to the military potential of individual countries or combination of countries or enhance the proliferation of weapons of mass destruction, may adversely affect the national security of the US. The Federal Government, therefore, implements several laws, Executive Orders, and regulations to control the export of certain commodities and technologies. These commodities and technologies require a license for export. Some of the controlled items are designated as ''dual-use,'' that is, commodities and technologies that have both civilian and military application. Some dual-use commodities are designated as ''nuclear dual-use''--items controlled for nuclear nonproliferation purposes. Another group of controlled commodities is designated as munitions, which are goods and technologies that have solely military uses. The Department of Energy (Energy) conducts reviews of export license applications for nuclear dual-use items and certain munitions. On August 26, 1998, the Chairman of the Senate Committee on Governmental Affairs requested that the Inspectors General from the Departments of Commerce, Defense, Energy, State, and Treasury, and the Central Intelligence Agency (CIA), update and expand on a 1993 interagency review conducted by the Inspectors General of the Departments of Commerce, Defense, Energy, and State of the export licensing processes for dual-use and munitions commodities.

Friedman, Gregory H.

1999-05-01T23:59:59.000Z

417

Dual capacity compressor with reversible motor and controls arrangement therefor  

DOE Patents (OSTI)

A hermetic reciprocating compressor such as may be used in heat pump applications is provided for dual capacity operation by providing the crankpin of the crankshaft with an eccentric ring rotatably mounted thereon, and with the end of the connecting rod opposite the piston encompassing the outer circumference of the eccentric ring, with means limiting the rotation of the eccentric ring upon the crankpin between one end point and an opposite angularly displaced end point to provide different values of eccentricity depending upon which end point the eccentric ring is rotated to upon the crankpin, and a reversible motor in the hermetic shell of the compressor for rotating the crankshaft, the motor operating in one direction effecting the angular displacement of the eccentric ring relative to the crankpin to the one end point, and in the opposite direction effecting the angular displacement of the eccentric ring relative to the crankpin to the opposite end point, this arrangement automatically giving different stroke lengths depending upon the direction of motor rotation. The mechanical structure of the arrangement may take various forms including at least one in which any impact of reversal is reduced by utilizing lubricant passages and chambers at the interface area of the crankpin and eccentric ring to provide a dashpot effect. In the main intended application of the arrangement according to the invention, that is, in a refrigerating or air conditioning system, it is desirable to insure a delay during reversal of the direction of compressor operation. A control arrangement is provided in which the control system controls the direction of motor operation in accordance with temperature conditions, the system including control means for effecting operation in a low capacity direction or alternatively in a high capacity direction in response to one set, and another set, respectively, of temperature conditions and with timer means delaying a restart of the compressor motor for at least a predetermined time in response to a condition of the control means operative to initiate a change in the operating direction of the compressor when it restarts.

Sisk, Francis J. (Washington Township, Fayette County, PA)

1980-12-02T23:59:59.000Z

418

Potential use of hollow spheres in dual gradient drilling  

E-Print Network (OSTI)

The increasing number of significant deepwater discoveries has pushed the operator and service oil companies to focus their efforts on developing new technologies to drill in deeper water. Dual gradient drilling (DGD) will allow reaching deeper target depths with greater final hole size, which in turn will permit setting larger tubing strings, and hence allowing for higher production rates. DGD can be accomplished by either lifting the mud returns mechanically or diluting the mud returns at the seafloor level by injecting lightweight components. Recently, a novel concept involving the use of hollow spheres in DGD applications has been introduced. In this research, we have evaluated the technical feasibility of using hollow spheres in DGD. We found that hollow spheres have high potential for such an application. They are stable to the drilling fluid additives and components and decrease the density of the drilling mud. The effect on pressure reduction at the seafloor can be significant even when the concentration of spheres injected is smaller than that required to reduce the mud density to seawater density. If the base mud is the carrier fluid, the hollow spheres DGD systems do not require equipment at the seafloor. Additionally, the injection of spheres does not affect the wellbore hydraulics under dynamic conditions. We have identified the constraints for using hollow spheres in DGD. These include particle size of the spheres, collapse of first spheres to be injected at deeper water depths, achieving high concentrations for systems using the mud base as the carrier fluid, and lack of technology to separate the spheres from the mud. In this research, we have developed a friendly, in-house computer program to model features specific to hollow-spheres DGD systems, such as wellbore hydraulics under static and dynamic conditions and the u-tube phenomenon. The results generated by our model match those produced by a field-tested computer program that performs the same task for a similar application. Our findings can be used for further studies of the constraints on the spheres identified in this research, to field test the advantages we predict that hollow spheres will have, and to develop software to fully model hollow-spheres DGD systems.

Vera Vera, Liliana

2002-01-01T23:59:59.000Z

419

On non-abelian T-dual geometries with Ramond fluxes  

E-Print Network (OSTI)

We show how to implement T-duality along non-abelian isometries in backgrounds with non-vanishing Ramond fields. When the dimension of the isometry group is odd (even) the duality swaps (preserves) the chirality of the theory. In certain cases a non-abelian duality can result in a massive type-IIA background. We provide two examples by dualising SU(2) isometry subgroups in $AdS_5\\times S^5$ and $AdS_3\\times S^3\\times T^4$. The resultant dual geometries inherit the original AdS factors but have transverse spaces with reduced isometry and preserve only half of the original supersymmetry. The non-abelian dual of $AdS_5\\times S^5$ has an M-theory lift which is related to the gravity duals of N=2 superconformal theories. We comment on a possible interpretation of this as a high spin limit.

Konstadinos Sfetsos; Daniel C. Thompson

2010-12-06T23:59:59.000Z

420

Turbine airfoil with dual wall formed from inner and outer layers separated by a compliant structure  

DOE Patents (OSTI)

A turbine airfoil usable in a turbine engine with a cooling system and a compliant dual wall configuration configured to enable thermal expansion between inner and outer layers while eliminating stress formation is disclosed. The compliant dual wall configuration may be formed a dual wall formed from inner and outer layers separated by a compliant structure. The compliant structure may be configured such that the outer layer may thermally expand without limitation by the inner layer. The compliant structure may be formed from a plurality of pedestals positioned generally parallel with each other. The pedestals may include a first foot attached to a first end of the pedestal and extending in a first direction aligned with the outer layer, and may include a second foot attached to a second end of the pedestal and extending in a second direction aligned with the inner layer.

Campbell; Christian X. (Oviedo, FL), Morrison; Jay A. (Oviedo, FL)

2011-12-20T23:59:59.000Z

Note: This page contains sample records for the topic "dual overhead cam" 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

Corrosion Behavior of Interconnect Candidate Alloys under Air//Simulated Reformate Dual Exposure Conditions  

SciTech Connect

Metallic interconnects in solid oxide fuel cell (SOFC) stacks, perform in a very challenging dual environment, as they are simultaneously exposed to a reducing fuel (either hydrogen or a hydrocarbon fuel) on one side and air on the other side at elevated temperatures. Thus candidate metals or alloys for the interconnect applications must demonstrate excellent surface stability under the SOFC operating conditions. Following previous studies which led to an improved understanding of the oxidation/corrosion behavior of metals and alloys under air/hydrogen dual exposure conditions, PNNL recently investigated the behavior of Fe-Cr and Ni-Cr base interconnect candidate alloys in an air/simulated reformate dual environment. This paper reports and discusses the findings of this work.

Yang, Z Gary; Xia, Gordon; Stevenson, Jeffry W.; Singh, Prabhakar

2008-11-28T23:59:59.000Z

422

High Temperature Corrosion Behavior of Oxidation Resistant Alloys under SOFC Interconnect Dual Exposures  

Science Conference Proceedings (OSTI)

The steady reduction in SOFC operating temperatures has led to increased interest in using metals and alloys to construct the stack interconnects that are exposed simultaneously to a fuel at the anode-side and air at the cathode-side during SOFC operation. Previous work has found that the high temperature oxidation and corrosion behavior of alloys under the dual exposure conditions can be significantly different from that in a single atmosphere exposure. To fully understand the anomalous oxidation and corrosion behavior under the interconnect dual exposure conditions, a number of metals and alloys were investigated under a variety of conditions, including both hydrogen and hydrocarbon fuels. This paper will present details of this work and discuss our current understanding on the anomalous oxidation behavior of metals and alloys observed under the interconnect dual exposure conditions.

Yang, Z Gary; Coffey, Greg W.; Rice, Joseph P.; Singh, Prabhakar; Stevenson, Jeffry W.; Xia, Gordon

2006-02-03T23:59:59.000Z

423

An investigation of dual-mode operation of a nuclear-thermal rocket engine  

DOE Green Energy (OSTI)

A preliminary assessment of the technical feasibility and mass competitiveness of a dual-mode nuclear propulsion and power system based on Rover-type reactors has been completed. Earlier studies have indicated that dual-mode systems appear attractive for electrical power levels of a few kilowatts. However, at the megawatt electrical power level considered in this study, it appears that extensive modifications to the nuclear-thermal engines would be required, the feasibility of which is unclear. Mass competitiveness at high electrical power levels is also uncertain. Further study of reactor and shield design in conjuction with mission and vehicle studies is necessary in order to determine a useful dual-mode power range. 9 refs., 20 figs., 4 tabs.

Kirk, W.L.; Hedstrom, J.C.; Moore, S.W.; McFarland, R.D.; Merrigan, M.A.; Buksa, J.J.; Cappiello, M.W.; Hanson, D.L.; Woloshun, K.A.

1991-06-01T23:59:59.000Z

424

Dynamics of BPS Domain Walls on Toric Self Dual Einstein Spaces  

SciTech Connect

In this paper we study Bogomolnyi-Prasad-Sommerfeld (BPS) domain walls of five dimensional gauged N = 2 supergravity coupled to a hypermultiplet whose scalars span a four dimensional toric self dual Einstein space, namely a four dimensional self dual Einstein space with torus symmetry. The walls preserve half of supersymmetry and are described by the gradient flow equations called BPS equations. An interesting feature is that the dynamics of such equations are determined by a real superpotential and the shape of two dimensional hyperbolic spaces defined on the upper half plane.

Gunara, Bobby E.; Zen, Freddy P. [Indonesia Center for Theoretical and Mathematical Physics (ICTMP) and Theoretical Physics Laboratory, Theoretical High Energy Physics and Instrumentation Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132 (Indonesia); Arianto [Department of Physics, Faculty of Mathematics and Natural Sciences, Udayana University, Jl. Kampus Bukit Jimbaran-Kuta Denpasar 80361 (Indonesia); Indonesia Center for Theoretical and Mathematical Physics (ICTMP) and Theoretical Physics Laboratory, Theoretical High Energy Physics and Instrumentation Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132 (Indonesia)

2010-06-22T23:59:59.000Z

425

A modified dual-priority scheduling algorithm for hard real-time systems to improve energy savings  

Science Conference Proceedings (OSTI)

We present a modification of the dual-priority scheduling algorithm for hard real-time systems that takes advantage of its performance to efficiently improve energy saving. The approach exploits the priority scheme to lengthen the runtime of tasks by ... Keywords: dual-priority scheduling, energy-awareness, fixed-priority scheduling, hard real-time systems, on-line scheduling

M. Angels Moncusí; Alex Arenas; Jesus Labarta

2003-01-01T23:59:59.000Z

426

A study on dual readout crystal calorimeter for hadron and jet energy measurement at a future lepton collider  

SciTech Connect

Studies of requirements and specifications of crystals are necessary to develop a new generation of crystals for dual readout crystal hadron or total absorption calorimeter. This is a short and basic study of the characteristics and hadron energy measurement of PbWO4 and BGO crystals for scintillation and Cerenkov Dual Readout hadron calorimeter.

Yeh, G.P.; /Fermilab

2010-01-01T23:59:59.000Z

427

Analysis of copper ion filaments and retention of dual-layered devices for resistance random access memory applications  

Science Conference Proceedings (OSTI)

For improvement of switching uniformity, we propose a dual-layer structure with different resistance values in each layer. During the forming process, a current path is created in a high-resistance region which localizes filament formation in ultra-thin ... Keywords: Copper filament, Dual-layer, Resistance random access memory (ReRAM)

Jaesik Yoon; Joonmyoung Lee; Hyejung Choi; Ju-Bong Park; Dong-jun Seong; Wootae Lee; Chunhum Cho; Seonghyun Kim; Hyunsang Hwang

2009-07-01T23:59:59.000Z

428

Three-Dimensional Air Circulation in a Squall Line from Airborne Dual-Beam Doppler Radar Data: A Test of Coplane Methodology Software  

Science Conference Proceedings (OSTI)

The detailed structure of a tropical squall line observed in central Florida was investigated from an airborne dual-beam Doppler radar, pointing respectively fore and aft. This allowed dual-Doppler observations from a straight flight path in a ...

Michel Chong; Jacques Testud

1996-02-01T23:59:59.000Z

429

Gluon propagators in the deep IR region and non-Abelian dual superconductivity for SU(3) Yang-Mills  

E-Print Network (OSTI)

We have presented non-Abelian dual superconductivity picture in the SU(3) Yang-Mills(YM) theory, and shown evidences such as the restricted U(2)-field dominance and the non-Abelian magnetic monopole dominance in the string tension. To establish the dual superconductivity picture, the dual Meissner effect in Yang-Mills theory must be examined, and we also presented the evidence of non-Abelian dual Meissner effect by measuring chromo-electric flux tube in the last lattice conferences. In this talk, by applying a new formulation of the YM theory on a lattice, the we further investigate the non-Abelian dual Meissner effect for SU(3) YM theory through correlation function. We examine non-abelian magnetic monopole currents as well as color flux created by the quark-antiquark source.

Akihiro Shibata; Kei-Ichi Kondo; Seikou Kato; Toru Shinohara

2012-12-12T23:59:59.000Z

430

A Preliminary Cost Study of the Dual Mode Inverter Controller  

SciTech Connect

In 1998, the Power Electronics and Electric Machinery Research Center (PEEMRC) at the Oak Ridge National Laboratory (ORNL) started a program to investigate alternate field weakening schemes for permanent magnet (PM) motors. The adjective ''alternate'' was used because at that time, outside research emphasis was on motors with interior-mounted PMs (IPMs). The PEEMRC emphasis was placed on motors with surface-mounted PMs (SPMs) because of the relative ease of manufacturing SPM motors compared with the IPM motors. Today the PEEMRC is continuing research on SPMs while examining the IPMs that have been developed by industry. Out of this task--the goal of which was to find ways to drive PM motors that inherently have low inductance at high speeds where their back-emf exceeds the supply voltage--ORNL developed and demonstrated the dual mode inverter control (DMIC) [1,2] method of field weakening for SPM motors. The predecessor of DMIC is conventional phase advance (CPA), which was developed by UQM Technologies, Inc. [3]. Fig. 1 shows the three sets of anti-parallel thyristors in the dashed box that comprise the DMIC. If one removes the dashed box by shorting each set of anti-parallel thyristors, the configuration becomes a conventional full bridge inverter on the left driving a three phase motor on the right. CPA may be used to drive this configuration ORNL's initial analyses of CPA and DMIC were based on driving motors with trapezoidal back-emfs [4-6], obtained using double layer lapped stator windings with one slot per pole per phase. A PM motor with a sinusoidal back-emf obtained with two poles per slot per phase has been analyzed under DMIC operation as a University of Tennessee-Knoxville (UTK) doctoral dissertation [7]. In the process of this research, ORNL has completed an analysis that explains and quantifies the role of inductance in these methods of control. The Appendix includes information on the equations for the three components of phase inductance, L{sub gap}, L{sub slot}, and L{sub endturns}. PM motors inherently have a lower inductance because of the increase in effective air gap caused by the magnet, which is in the denominator of the equation for L{sub gap}. L{sub gap} accounts for about half of the phase inductance. Because of the low inductance, there is a propensity for currents to exceed the motor's rated value. DMIC solves this problem for low-inductance PM motors and, in addition, provides a number of safety features that protect against uncontrolled generator mode operation [8,9]; however, the DMIC topology adds a pair of anti-parallel thyristors in each of the three phases, thereby introducing additional silicon costs as well as additional voltage drops during operation. It poses the tradeoff question; under what conditions can the beneficial features of DMIC offset its additional silicon cost and voltage drop losses? The purpose of this report is to address the tradeoff question. Sections of the report will: (1) review the role of self-inductance in performance and control of PM motors, (2) discuss the bounding inductances for motors with trapezoidal back-emfs under CPA control, (3) discuss the bounding inductances for trapezoidal back-emfs under DMIC, (4) discuss the bounding inductances for the PM synchronous motor (PMSM), (5) present the analysis showing how DMIC minimizes current in PMSMs, (6) present the results of a cost study conducted for two motors driven using a CPA inverter and for two motors driven using DMIC, (7) discuss estimating life cycle cost benefits, and (8) present conclusions.

McKeever, J.W.

2005-01-28T23:59:59.000Z

431

A Preliminary Cost Study of the Dual Mode Inverter Controller  

SciTech Connect

In 1998, the Power Electronics and Electric Machinery Research Center (PEEMRC) at the Oak Ridge National Laboratory (ORNL) started a program to investigate alternate field weakening schemes for permanent magnet (PM) motors. The adjective ''alternate'' was used because at that time, outside research emphasis was on motors with interior-mounted PMs (IPMs). The PEEMRC emphasis was placed on motors with surface-mounted PMs (SPMs) because of the relative ease of manufacturing SPM motors compared with the IPM motors. Today the PEEMRC is continuing research on SPMs while examining the IPMs that have been developed by industry. Out of this task--the goal of which was to find ways to drive PM motors that inherently have low inductance at high speeds where their back-emf exceeds the supply voltage--ORNL developed and demonstrated the dual mode inverter control (DMIC) [1,2] method of field weakening for SPM motors. The predecessor of DMIC is conventional phase advance (CPA), which was developed by UQM Technologies, Inc. [3]. Fig. 1 shows the three sets of anti-parallel thyristors in the dashed box that comprise the DMIC. If one removes the dashed box by shorting each set of anti-parallel thyristors, the configuration becomes a conventional full bridge inverter on the left driving a three phase motor on the right. CPA may be used to drive this configuration ORNL's initial analyses of CPA and DMIC were based on driving motors with trapezoidal back-emfs [4-6], obtained using double layer lapped stator windings with one slot per pole per phase. A PM motor with a sinusoidal back-emf obtained with two poles per slot per phase has been analyzed under DMIC operation as a University of Tennessee-Knoxville (UTK) doctoral dissertation [7]. In the process of this research, ORNL has completed an analysis that explains and quantifies the role of inductance in these methods of control. The Appendix includes information on the equations for the three components of phase inductance, L{sub gap}, L{sub slot}, and L{sub endturns}. PM motors inherently have a lower inductance because of the increase in effective air gap caused by the magnet, which is in the denominator of the equation for L{sub gap}. L{sub gap} accounts for about half of the phase inductance. Because of the low inductance, there is a propensity for currents to exceed the motor's rated value. DMIC solves this problem for low-inductance PM motors and, in addition, provides a number of safety features that protect against uncontrolled generator mode operation [8,9]; however, the DMIC topology adds a pair of anti-parallel thyristors in each of the three phases, thereby introducing additional silicon costs as well as additional voltage drops during operation. It poses the tradeoff question; under what conditions can the beneficial features of DMIC offset its additional silicon cost and voltage drop losses? The purpose of this report is to address the tradeoff question. Sections of the report will: (1) review the role of self-inductance in performance and control of PM motors, (2) discuss the bounding inductances for motors with trapezoidal back-emfs under CPA control, (3) discuss the bounding inductances for trapezoidal back-emfs under DMIC, (4) discuss the bounding inductances for the PM synchronous motor (PMSM), (5) present the analysis showing how DMIC minimizes current in PMSMs, (6) present the results of a cost study conducted for two motors driven using a CPA inverter and for two motors driven using DMIC, (7) discuss estimating life cycle cost benefits, and (8) present conclusions.

McKeever, J.W.

2005-01-28T23:59:59.000Z

432

Research on water level optimal control of boiler drum based on dual heuristic dynamic programming  

Science Conference Proceedings (OSTI)

Boiler drum system is an important component of a thermal power plant or industrial production, and the water level is a critical parameter of boiler drum control system. Because of non-linear, strong coupling and large disturbance, it is difficult to ... Keywords: BP neural network, boiler drum level, dual heuristic dynamic programming, optimal control

Qingbao Huang; Shaojian Song; Xiaofeng Lin; Kui Peng

2011-05-01T23:59:59.000Z

433

Dual-channel Haptic Synthesis of Viscoelastic Tissue Properties using Programmable Eddy Current Brakes  

Science Conference Proceedings (OSTI)

We describe a novel method for haptic synthesis of viscoelastic responses which employs a dual-channel haptic interface. It has motors that generate torque independently of velocity and brakes that generate viscous torque independently of position. ... Keywords: eddy current brakes, haptic simulation, viscoelastic simulation

Andrew H. C. Gosline; Vincent Hayward

2009-10-01T23:59:59.000Z

434

A Dual Mode Human-Robot Teleoperation Interface Based on Airflow in the Aural Cavity  

Science Conference Proceedings (OSTI)

Robot teleoperation systems have been limited in their utility due to the need for operator motion, lack of portability and limitation to singular input modalities. In this article, the design and construction of a dual-mode human—machine ... Keywords: decision fusion, human-machine interface, multi-modal control, physiological signal recognition, robot teleoperation

Ravi Vaidyanathan; Monique P. Fargues; R. Serdar Kurcan; Lalit Gupta; Srinivas Kota; Roger D. Quinn; Dong Lin

2007-11-01T23:59:59.000Z

435

Profit sharing and firm performance in the manufacturer-retailer dual-channel supply chain  

Science Conference Proceedings (OSTI)

With the rapid development of e-commerce and the adoption of dual channels, increasingly manufacturers and retailers are implementing profit sharing strategies in order to improve channel coordination and supply chain performance. In this study, we focus ... Keywords: Channel coordination, Game theory, Online marketing, Profit bargaining, Profit sharing, Supply chain management

Ruiliang Yan

2008-09-01T23:59:59.000Z

436

Allocation of transmit power in spatially-correlated dual-hop MIMO relay channels  

Science Conference Proceedings (OSTI)

This paper considers power allocation in spatially-correlated dual-hop multiple-input multiple-output (MIMO) relay channels under power constraint for each hop channel. The proposed scheme allocates the transmit power considering the spatial correlation ... Keywords: MIMO relay channel, channel correlation, transmit power allocation

Ah-Young Kim; Hee-Nam Cho; Jin-Woo Lee; Yong-Hwan Lee

2009-09-01T23:59:59.000Z

437

THERMAL PERFORMANCE OF A DUAL-CHANNEL, HELIUM-COOLED, TUNGSTEN HEAT EXCHANGER  

E-Print Network (OSTI)

THERMAL PERFORMANCE OF A DUAL-CHANNEL, HELIUM-COOLED, TUNGSTEN HEAT EXCHANGER Dennis L. Youchison-cooled, refractory heat exchangers are now under consideration for first wall and divertor applications-channel, helium-cooled heat exchanger made almost entirely of tungsten was designed and fabricated by Thermacore

California at Los Angeles, University of

438

The Lambda Lambda-Bar calculus: a dual calculus for unconstrained strategies  

Science Conference Proceedings (OSTI)

We present a calculus which combines a simple, CCS-like representation of finite behaviors, with two dual binders ? and ?¯. Infinite behaviors are obtained through a syntactical fixed-point operator, which is used to give a translation ... Keywords: game semantics, lambda-calculus

Alexis Goyet

2013-01-01T23:59:59.000Z

439

Formal evaluation of the robustness of dual-rail logic against DPA attacks  

Science Conference Proceedings (OSTI)

Based on a first order model of the switching current flowing in CMOS cell, an investigation of the robustness against DPA of dual-rail logic is carried out. The result of this investigation, performed on 130nm process, is a formal identification of ...

Alin Razafindraibe; Michel Robert; Philippe Maurine

2006-09-01T23:59:59.000Z

440

Extended Commissioning and Calibration of the Dual-Beam Imaging Polarimeter  

E-Print Network (OSTI)

In our previous paper (Masiero et al. 2007) we presented the design and initial calibrations of the Dual-Beam Imaging Polarimeter (DBIP), a new optical instrument for the University of Hawaii's 2.2 m telescope on the summit of Mauna Kea, Hawaii. In this followup work we discuss our full-Stokes mode commissioning including crosstalk determination and our typical observing methodology.

Joseph Masiero; Klaus Hodapp; David Harrington; Haosheng Lin

2008-09-25T23:59:59.000Z

Note: This page contains sample records for the topic "dual overhead cam" 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

Annual Logging Symposium, June 3-6, 2007 INTERPRETATION OF FREQUENCY-DEPENDENT DUAL-  

E-Print Network (OSTI)

METHOD Wei Yang, and Carlos Torres-Verdín, The University of Texas at Austin; Ridvan Akkurt, Saleh Al at the SPWLA 48th Annual Logging Symposium held in Austin, Texas, United States, June 3-6, 2007. ABSTRACT configuration of Halliburton Energy Services' Dual Laterolog Logging Tool (DLLT-BTM ) to reproduce measurements

Torres-Verdín, Carlos

442

The DRL Underwater Sensor Network: Supporting Dual Communications, Sensing, and Mobility  

E-Print Network (OSTI)

The DRL Underwater Sensor Network: Supporting Dual Communications, Sensing, and Mobility Iuliu Vasilescu, Carrick Detweiler and Daniela Rus We propose to demonstrate the underwater sensor network are anchored with weights and form a static underwater network. This network self-localizes a range based 3D

Farritor, Shane

443

Exciting understanding in Pompeii through on-site parallel interaction with dual time virtual models  

Science Conference Proceedings (OSTI)

Communication effectiveness and reconstruction validation are two important goals faced by archaeologists. This paper shows how these targets can be reached more easily by means of a mobile and user-centric fruition system designed with both the visitor's ... Keywords: connectivity, dual-time modelling, interactivity, interface, multimedia, pompeii, reconstruction, virtual archaeology

Daniela Scagliarini; Antonella Coralini; Erika Vecchietti; Tullio Salmon Cinotti; Luca Roffia; Stefania Galasso; Maurizio Malavasi; Massimiliano Pigozzi; Enrico Romagnoli; Fabio Sforza

2001-11-01T23:59:59.000Z

444

S-Band Dual-Polarization Radar Observations of Winter Storms  

Science Conference Proceedings (OSTI)

This study is based on analyses of dual-polarization radar observations made by the 11-cm-wavelength Colorado State University–University of Chicago–Illinois State Water Survey (CSU–CHILL) system during four significant winter storms in ...

Patrick C. Kennedy; Steven A. Rutledge

2011-04-01T23:59:59.000Z

445

A Dual-Objective Evolutionary Algorithm for Rules Extraction in Data Mining  

Science Conference Proceedings (OSTI)

This paper presents a dual-objective evolutionary algorithm (DOEA) for extracting multiple decision rule lists in data mining, which aims at satisfying the classification criteria of high accuracy and ease of user comprehension. Unlike existing approaches, ... Keywords: classification, data mining, evolutionary algorithm, rules extraction

K. C. Tan; Q. Yu; J. H. Ang

2006-06-01T23:59:59.000Z

446

Holocene precipitation seasonality captured by a dual hydrogen and oxygen isotope approach at Steel Lake, Minnesota  

E-Print Network (OSTI)

Holocene precipitation seasonality captured by a dual hydrogen and oxygen isotope approach at Steel. Shuman e , John W. Williams f a Limnological Research Center, Department of Geology, University, Appalachian Laboratory, Frostburg, MD, 21532, United States c Departments of Plant Biology and Geology

Hu, Feng Sheng

447

Dual-recycled cavity-enhanced Michelson interferometer for gravitational-wave detection  

E-Print Network (OSTI)

in Livingston, Louisiana, and in Hanford, Washington. Near Hanover, Ger- many, the German­British GEO2 collaboration is building a 600-m dual-recycled MI. The Japanese TAMA3 collaboration is constructing a 300-m will produce enough gravitational strain to be detect- able. Along with the construction and commission- ing

Tanner, David B.

448

Identifying IPv6 network problems in the dual-stack world  

Science Conference Proceedings (OSTI)

One of the major hurdles limiting IPv6 adoption is the existence of poorly managed experimental IPv6 sites that negatively affect the perceived quality of the IPv6 Internet. To assist network operators in improving IPv6 networks, we are exploring methods ... Keywords: IPv6, delay measurement, dual-stack, path analysis, path visualization

Kenjiro Cho; Matthew Luckie; Bradley Huffaker

2004-09-01T23:59:59.000Z

449

Scenario Formulation of Stochastic Linear Programs and the Homogeneous Self-Dual Interior-Point Method  

Science Conference Proceedings (OSTI)

We consider a homogeneous self-dual interior-point algorithm for solving multistage stochastic linear programs. The algorithm is particularly suitable for the so-called “scenario formulation” of the problem, whose constraint system consists ... Keywords: decomposition, interior-point methods, multistage stochastic linear programs

Jie Sun; Xinwei Liu

2006-01-01T23:59:59.000Z

450

Solving the Unit Commitment Problem in Power Generation by Primal and Dual Methods \\Lambda  

E-Print Network (OSTI)

deals with the fuel cost optimal scheduling of on/off decisions and output levels for generating unitsSolving the Unit Commitment Problem in Power Generation by Primal and Dual Methods \\Lambda D and results of test runs are reported. 1 Introduction The unit commitment problem in electricity production

Römisch, Werner

451

Model 1931/2931 Series Single and Dual-Channel Optical Meters  

E-Print Network (OSTI)

Model 1931/2931 Series Single and Dual-Channel Optical Meters User's Manual #12;ii Preface #12;iii/2931-C Series Optical Meters optimized for your applications, Newport will on occasion update existing ................................................................................ 21 2.2 Optical Meter Functionality ....................................................... 22 2

Kleinfeld, David

452

Model 1936/2936-C Series Single and Dual-Channel Optical Meters  

E-Print Network (OSTI)

Model 1936/2936-C Series Single and Dual-Channel Optical Meters User's Manual #12;2 Preface #12 to keep the 1936/2936 Series Optical Meters optimized for your applications, Newport will on occasion ................................................................................ 25 2.2 Optical Meter Functionality ....................................................... 26 2

Kleinfeld, David

453

Dual Delayed Feedback Provides Sensitivity and Robustness to the NF-kB Signaling Module  

E-Print Network (OSTI)

Dual Delayed Feedback Provides Sensitivity and Robustness to the NF-kB Signaling Module Diane M of the transcription factor NF-kB. Linear stability analysis of the model shows that oscillatory frequency is a hard system minimizes stochastic excursions of the output to produce a robust NF-kB response. Citation: Longo

Hasty, Jeff

454

Masking and Dual-rail Logic Don't Add Up Patrick Schaumont1  

E-Print Network (OSTI)

-consumption pattern and can be exploited in power analysis attacks. Third, the loading imbalance of dual-rail circuits is that the circuit switches between two complementary states with a different power profile. Earlier work has shown that the mask-bit value can be estimated from the power con- sumption profile, and that masked logic remains

Schaumont, Patrick

455

A Comparative Study of New Barrier Functions for Primal-Dual ...  

E-Print Network (OSTI)

Up till now primal-dual IPMs all use the Newton direction as the search ... in terms of the kernel function and its first and second derivative. .... outer iteration by performing a5k -update, otherwise we enter an inner iteration by computing.

456

Hail Growth Mechanisms in a Colorado Storm. Part I: Dual-Wavelength Radar Observations  

Science Conference Proceedings (OSTI)

Extensive comparisons of dual-wavelength (10 and 3 cm) radar data with observations at the ground and penetration aircraft (T-28) measurements of hail in a Colorado storm show that positive hail signals (10 cm reflectivity factor exceeds that at ...

A. R. Jameson; A. J. Heymsfield

1980-08-01T23:59:59.000Z

457

Dual-Level Parallel Analysis of Harbor Wave Response Using MPI and OpenMP  

Science Conference Proceedings (OSTI)

The authors describe their experiences converting an existing serial production code to a parallel code combining both MPI and OpenMP. Such dual-level parallel codes will be able to take full advantage of the emerging class of high performance computer ...

Steve W. Bova; Clay P. Breshears; Christine E. Cuicchi; Zeki Demirbilek; Henry A. Gabb

2000-02-01T23:59:59.000Z

458

Conservation laws for the Maxwell-Dirac equations with a dual Ohm's law  

E-Print Network (OSTI)

Using a general theorem on conservation laws for arbitrary differential equations proved by Ibragimov, we have derived conservation laws for Dirac's symmetrized Maxwell-Lorentz equations under the assumption that both the electric and magnetic charges obey linear conductivity laws (dual Ohm's law). We find that this linear system allows for conservation laws which are non-local in time.

Nail H. Ibragimov; Raisa Khamitova; Bo Thidé

2007-03-05T23:59:59.000Z

459

Proposal for a Spaceborne Dual-Beam Rain Radar with Doppler Capability  

Science Conference Proceedings (OSTI)

The potential characteristics and performances of a spaceborne dual-beam radar (or stereo radar) operating at 24 GHz, and devoted primarily to the retrieval of rain-rate structure by using the stereo-radar analysis, were presented in a previous ...

Paul Amayenc; Jacques Testud; Mongi Marzoug

1993-06-01T23:59:59.000Z

460

Dual-band reflectarrays using microstrip ring elements and their applications with various feeding arrangements  

E-Print Network (OSTI)

In recent years there has been a growing demand for reduced mass, small launch volume, and, at the same time, high-gain large-aperture antenna systems in modern space-borne applications. This dissertation introduces new techniques for dual-band reflectarray antennas to meet these requirements. A series of developments is presented to show the dual-band capability of the reflectarray. A novel microstrip ring structure has been developed to achieve circular polarization (CP). A C/Ka dual-band front-fed reflectarray antenna has been designed to demonstrate the dual-band circular polarized operation. The proposed ring structure provides many advantages of compact size, more freedom in the selection of element spacing, less blockage between circuit layers, and broader CP bandwidth as compared to the patches. An X/Ka dual-band offset-fed reflectarray is made of thin membranes, with their thickness equal to 0.0508 mm in both layers. Several degrading effects of thin substrates are discussed. To overcome these problems, a new configuration is developed by inserting empty spaces of the proper thickness below both the X and Ka band membranes. More than 50 % efficiencies are achieved at both frequency ranges, and the proposed scheme is expected to be a good candidate to meet the demand for future inflatable antenna systems. An X/Ka dual-band microstrip reflectarray with circular polarization has also been constructed using thin membranes and a Cassegrain offset-fed configuration. It is believed that this is the first Cassegrain reflectarray ever developed. This antenna has a 0.75-meter-diameter aperture and uses a metallic sub-reflector and angular-rotated annular ring elements. It achieved a measured 3 dB gain bandwidth of 700 MHz at Xband and 1.5 GHz at Ka-band, as well as a CP bandwidth (3 dB axial ratio) of more than 700 MHz at X-band and more than 2 GHz at Ka-band. The measured peak efficiencies are 49.8 % at X-band and 48. 2 % at Ka-band. In summary, this dissertation presents a series of new research developments to support the dual-band operation of the reflectarray antenna. The results of this work are currently being implemented onto a 3-meter reflectarray with inflatable structures at the Jet Propulsion Laboratory and are planned for other applications such as an 8-meter inflatable reflectarray in the near future.

Han, Chul Min

2006-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "dual overhead cam" 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

Modern Methods for Lipid AnalysisChapter 13 Dual Parallel Liquid Chromatography/Mass Spectrometry for Lipid Analysis  

Science Conference Proceedings (OSTI)

Modern Methods for Lipid Analysis Chapter 13 Dual Parallel Liquid Chromatography/Mass Spectrometry for Lipid Analysis Methods and Analyses eChapters Methods - Analyses Books AOCS Press Downloadable pdf of Chapter

462

An Efficient Dual-Resolution Approach for Ensemble Data Assimilation and Tests with Simulated Doppler Radar Data  

Science Conference Proceedings (OSTI)

A new efficient dual-resolution (DR) data assimilation algorithm is developed based on the ensemble Kalman filter (EnKF) method and tested using simulated radar radial velocity data for a supercell storm. Radar observations are assimilated on ...

Jidong Gao; Ming Xue

2008-03-01T23:59:59.000Z

463

Precipitation Classification and Quantification Using X-band Dual-Polarization Weather Radar: Application in the Hydrometeorology Testbed  

Science Conference Proceedings (OSTI)

This paper presents new methods for rainfall estimation from X-band dual-polarization radar observations along with advanced techniques for quality control, hydrometeor classification, and estimation of specific differential phase. Data collected ...

S. Lim; R. Cifelli; V. Chandrasekar; S. Y. Matrosov

464

Low-Wavenumber Structure and Evolution of the Hurricane Inner Core Observed by Airborne Dual-Doppler Radar  

Science Conference Proceedings (OSTI)

The asymmetric dynamics of the hurricane inner-core region is examined through a novel analysis of high temporal resolution, three-dimensional wind fields derived from airborne dual-Doppler radar. Seven consecutive composites of Hurricane Olivia’...

Paul D. Reasor; Michael T. Montgomery; Frank D. Marks Jr.; John F. Gamache

2000-06-01T23:59:59.000Z

465

Non-Rayleigh Scattering Effect in Rain Observations by an X- and Ka-band Dual-Wavelength Radar  

Science Conference Proceedings (OSTI)

The effect of non-Rayleigh scattering appearing in a rain observation experiment using a dual-wavelength rain radar, is investigated. The non-Rayleigh scattering effect causes a small difference between the effective radar reflectivity factor and ...

Kenji Nakamura; Hideyuki Inomata

1991-06-01T23:59:59.000Z

466

Observations of the Sea-Breeze Front during CaPE. Part II: Dual-Doppler and Aircraft Analysis  

Science Conference Proceedings (OSTI)

The three-dimensional kinematic structures of offshore and onshore flow sea-breeze fronts observed during the CaPE experiment are shown using high resolution dual-Doppler and aircraft data. The fronts interact with horizontal convective rolls (...

Nolan T. Atkins; Roger M. Wakimoto; Tammy M. Weckwerth

1995-04-01T23:59:59.000Z

467

An $O(\\sqrt{n}\\log \\frac{(x^0)^Ts^0}{\\epsilon})$ iteration primal-dual ...  

E-Print Network (OSTI)

An $O(\\sqrt{n}\\log \\frac{(x^0)^Ts^0}{\\epsilon})$ iteration primal-dual path- following method, based on wide neighborhoods and large updates, for monotone ...

468

Design and characterization of a low cost dual differential proving ring force sensor utilizing Hall-effect sensors  

E-Print Network (OSTI)

A novel dual differential hall-effect based proving ring force sensor has been designed, manufactured, and tested. Strain gauge based force sensors are among the most common methods of measuring static and dynamic forces, ...

Rivest, Christopher W. (Christopher Warren)

2006-01-01T23:59:59.000Z

469

83-9E9-TOPIC-P3 Unrestricted DOMslon ManagerHIGH-EFFICIENCY DUAL-STROKE COMPRESSOR  

E-Print Network (OSTI)

without ill effect. Compressor performance was measured using a commercially available compressor C) condenser subcooling. Characteristic performance curves for the Mod 0 dual stroke compressor performance; and from the former Westinghouse Commercial and Residential Air Conditioning Division, P. G

Oak Ridge National Laboratory

470

Dual molecular imaging for targeting metalloproteinase activity and apoptosis in atherosclerosis: molecular imaging facilitates understanding of pathogenesis  

E-Print Network (OSTI)

pathogenesis to superior molecular imaging, and back. J AmZhou J, Yala- manchili P, et al. Molecular imaging of matrixJapan. Haider et al Dual molecular imaging for targeting

2009-01-01T23:59:59.000Z

471

Dual-Doppler Radar Analysis of a Midlatitude Squall Line with a Trailing Region of Stratiform Rain  

Science Conference Proceedings (OSTI)

The mesoscale structure of a squall-line system that passed over Oklahoma on 22 May 1976 is investigated by dual-Doppler radar analysis. The mature storm consisted of a leading line of deep convection, which exhibited organized multicellular ...

Bradley F. Smull; Robert A. Houze Jr.

1987-08-01T23:59:59.000Z

472

Development of Dual-Air-Assistant Atomizing Nozzle to Apply Aerosol-Sealing  

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

Development of Dual-Air-Assistant Atomizing Nozzle to Apply Aerosol-Sealing Development of Dual-Air-Assistant Atomizing Nozzle to Apply Aerosol-Sealing Technology in Air Duct Systems Speaker(s): Alan Ropers Date: July 8, 2002 - 12:00pm Location: Bldg. 90 An Aerosol-sealing Technology was developed by LBNL to seal leaks in Air Duct Systems (ADS). The firm AEROSEAL already commercializes this technology for residential ADS. The current goal of our research at the Laboratory is to apply this technology to large commercial ADS. That means to develop a new kind of injector called "Compact Injector". So far, the injector that is used is a nozzle from the Schlick-Dusen firm. Results in terms of sealing rate are satisfactory, but this nozzle quickly clogs up with sealant particles. There are two reasons for the clogging problem: the

473

Tracking formulas and strategies for a receiver oriented dual-axis tracking toroidal heliostat  

SciTech Connect

A 4 m x 4 m toroidal heliostat with receiver oriented dual-axis tracking, also called spinning-elevation tracking, was developed as an auxiliary heat source for a hydrogen production system. A series of spinning-elevation tracking formulas have been derived for this heliostat. This included basic tracking formulas, a formula for the elevation angle for heliostat with a mirror-pivot offset, and a more general formula for the biased elevation angle. This paper presents the new tracking formulas in detail and analyzes the accuracy of applying a simplifying approximation. The numerical results show these receiver oriented dual-axis tracking formula approximations are accurate to within 2.5 x 10{sup -6} m in image plane. Some practical tracking strategies are discussed briefly. Solar images from the toroidal heliostat at selected times are also presented. (author)

Guo, Minghuan; Wang, Zhifeng; Liang, Wenfeng; Zhang, Xiliang; Zang, Chuncheng [Key Laboratory of Solar Thermal Energy and Photovoltaic System of Chinese Academy of Sciences, Institute of Electrical Engineering, Beijing 100190 (China); Lu, Zhenwu; Wei, Xiudong [Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences (CAS), Jilin 130033 (China)

2010-06-15T23:59:59.000Z

474

Low Dose Radiation Research Program: Dual Regulation of JB6 Transformation  

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

Dual Regulation of JB6 Transformation by Low Dose Gamma Radiation. Dual Regulation of JB6 Transformation by Low Dose Gamma Radiation. Authors: Thomas J. Weber,1 Lye M. Markillie,1 William B. Chrisler,1 Xingye C. Lei,1 and Nancy H. Colburn2 Institutions: 1Molecular Biosciences, Pacific Northwest National Laboratory. 2Gene Regulation Section, Basic Research Laboratory, National Cancer Institute JB6 mouse epidermal cells have been instrumental in defining the molecular mechanisms associated with neoplastic transformation in response to known tumor promoters. JB6 cells exhibit a clonal growth response to oxygen free radicals suggesting this model may also be useful for radiation research. Treatment of JB6 cells with 2 and 20 cGy gamma radiation resulted in a weak, but dose-dependent increase in anchorage-independent growth observed

475

Dual-energy neutron tomography of water in rock using the Argonne IPNS  

DOE Green Energy (OSTI)

In dual-energy hydrogen imaging, the increase in hydrogen neutron cross-section at subthermal neutron energies is used to enhance the imaging of small amounts of hydrogen against a background of other absorbing materials by subtracting a tomographic image obtained for higher energy neutrons from that obtained for subthermal neutrons (picking energies such that the other absorbing materials have nearly the same cross-sections at both energies). This technique was used to provide dual-energy imaging of water in tuffaceous rock, with the goal being to track water flow through porous rock for site risk analysis of permanent disposal of radwaste. A feasibility experiment was conducted at the IPNS facility with coarse spatial resolution, yielding promising results.

Rhodes, E.; Kupperman, D.S.; Hitterman, R.L.

1992-07-01T23:59:59.000Z

476

Final Report [Dual-Readout Calorimetry for High-Quality Energy Measurements  

Science Conference Proceedings (OSTI)

This document constitutes the final report on the project ”Dual-Readout Calorimetry for High- Quality Energy Measurements”. The project was carried out by a consortium of US and Italian physicists, led by Dr. Richard Wigmans (Texas tech University). This consortium built several particle detectors and tested these at the European Center for Nuclear Research (CERN) in Geneva, Switzerland. The idea arose to use scintillating crystals as dual-readout calorimeters. Such crystals were of course already known to provide excellent energy resolution for the detection of particles developing electromagnetic (em) showers. The efforts to separate the signals from scintillating crystals into scintillation and Cerenkov components led to four different methods by which this could be accomplished. These methods are based on a) the directionality, b) spectral differences, c) the time structure and d) the polarization of the signals.

Wigmans, Richard; Nural, Akchurin

2013-09-01T23:59:59.000Z

477

Design and Optimization of Low Voltage High Performance Dual Threshold CMOS Circuits  

E-Print Network (OSTI)

Reduction in leakage power has become an important concern in lowvoltage, lowpower and high performance applications. In this paper, we use dual threshold technique to reduce leakage power by assigning high threshold voltage to some transistors in non-critical paths, and using lowthreshold transistors in critical paths. In order to achieve the best leakage power saving under target performance constraints, an algorithm is presented for selecting and assigning an optimal high threshold voltage. A general standby leakage current model which has been veri#ed by HSPICE is used to estimate standby leakage power. Results show that dual threshold technique is good for power reduction during both standby and active modes. The standby leakage power savings for some ISCAS benchmarks can be more than 50#. 1 Introduction With the growing use of portable and wireless electronic systems, reduction in power consumption has become more and more importantintoday's VLSI circuit and system designs #1#, ...

Liqiong Wei; Zhanping Chen; Mark Johnson; Kaushik Roy; Vivek De

1998-01-01T23:59:59.000Z

478

DualTrust: A Distributed Trust Model for Swarm-Based Autonomic Computing Systems  

SciTech Connect

For autonomic computing systems that utilize mobile agents and ant colony algorithms for their sensor layer, trust management is important for the acceptance of the mobile agent sensors and to protect the system from malicious behavior by insiders and entities that have penetrated network defenses. This paper examines the trust relationships, evidence, and decisions in a representative system and finds that by monitoring the trustworthiness of the autonomic managers rather than the swarming sensors, the trust management problem becomes much more scalable and still serves to protect the swarm. We then propose the DualTrust conceptual trust model. By addressing the autonomic manager’s bi-directional primary relationships in the ACS architecture, DualTrust is able to monitor the trustworthiness of the autonomic managers, protect the sensor swarm in a scalable manner, and provide global trust awareness for the orchestrating autonomic manager.

Maiden, Wendy M.; Dionysiou, Ioanna; Frincke, Deborah A.; Fink, Glenn A.; Bakken, David E.

2011-02-01T23:59:59.000Z

479

Structure of human dual-specificity phosphatase 27 at 2.38 Å resolution  

SciTech Connect

There are over 100 genes in the human genome that encode protein tyrosine phosphatases (PTPs) and approximately 60 of these are classified as dual-specificity phosphatases (DUSPs). Although many dual-specificity phosphatases are still not well characterized, novel functions have been discovered for some of them that have led to new insights into a variety of biological processes and the molecular basis for certain diseases. Indeed, as the functions of DUSPs continue to be elucidated, a growing number of them are emerging as potential therapeutic targets for diseases such as cancer, diabetes and inflammatory disorders. Here, the overexpression, purification and structure determination of DUSP27 at 2.38 {angstrom} resolution are presented.

Lountos, George T.; Tropea, Joseph E.; Waugh, David S. (NCI)

2012-03-26T23:59:59.000Z

480

The dual-mirror Small Size Telescope for the Cherenkov Telescope Array  

E-Print Network (OSTI)

In this paper, the development of the dual mirror Small Size Telescopes (SST) for the Cherenkov Telescope Array (CTA) is reviewed. Up to 70 SST, with a primary mirror diameter of 4 m, will be produced and installed at the CTA southern site. These will allow investigation of the gamma-ray sky at the highest energies accessible to CTA, in the range from about 1 TeV to 300 TeV. The telescope presented in this contribution is characterized by two major innovations: the use of a dual mirror Schwarzschild-Couder configuration and of an innovative camera using as sensors either multi-anode photomultipliers (MAPM) or silicon photomultipliers (SiPM). The reduced plate-scale of the telescope, achieved with the dual-mirror optics, allows the camera to be compact (40 cm in diameter), and low-cost. The camera, which has about 2000 pixels of size 6x6 mm^2, covers a field of view of 10{\\deg}. The dual mirror telescopes and their cameras are being developed by three consortia, ASTRI (Astrofisica con Specchi a Tecnologia Replicante Italiana, Italy/INAF), GATE (Gamma-ray Telescope Elements, France/Paris Observ.) and CHEC (Compact High Energy Camera, universities in UK, US and Japan) which are merging their efforts in order to finalize an end-to-end design that will be constructed for CTA. A number of prototype structures and cameras are being developed in order to investigate various alternative designs. In this contribution, these designs are presented, along with the technological solutions under study.

G. Pareschi; G. Agnetta; L. A. Antonelli; D. Bastieri; G. Bellassai; M. Belluso; C. Bigongiari; S. Billotta; B. Biondo; G. Bonanno; G. Bonnoli; P. Bruno; A. Bulgarelli; R. Canestrari; M. Capalbi; P. Caraveo; A. Carosi; E. Cascone; O. Catalano; M. Cereda; P. Conconi; V. Conforti; G. Cusumano; V. De Caprio; A. De Luca; A. Di Paola; F. Di Pierro; D. Fantinel; M. Fiorini; D. Fugazza; D. Gardiol; M. Ghigo; F. Gianotti; S. Giarrusso; E. Giro; A. Grillo; D. Impiombato; S. Incorvaia; A. La Barbera; N. La Palombara; V. La Parola; G. La Rosa; L. Lessio; G. Leto; S. Lombardi; F. Lucarelli; M. C. Maccarone; G. Malaguti; G. Malaspina; V. Mangano; D. Marano; E. Martinetti; R. Millul; T. Mineo; A. MistÒ; C. Morello; G. Morlino; M. R. Panzera; G. Rodeghiero; P. Romano; F. Russo; B. Sacco; N. Sartore; J. Schwarz; A. Segreto; G. Sironi; G. Sottile; A. Stamerra; E. Strazzeri; L. Stringhetti; G. Tagliaferri; V. Testa; M. C. Timpanaro; G. Toso; G. Tosti; M. Trifoglio; P. Vallania; S. Vercellone; V. Zitelli; For The Astri Collaboration; J. P. Amans; C. Boisson; C. Costille; J. L. Dournaux; D. Dumas; G. Fasola; O. Hervet; J. M. Huet; P. Laporte; C. Rulten; H. Sol; A. Zech; For The Gate Collaboration; R. White; J. Hinton; D. Ross; J. Sykes; S. Ohm; J. Schmoll; P. Chadwick; T. Greenshaw; M. Daniel; G. Cotter; G. S. Varner; S. Funk; J. Vandenbroucke; L. Sapozhnikov; J. Buckley; P. Moore; D. Williams; S. Markoff; J. Vink; D. Berge; N. Hidaka; A. Okumura; H. Tajima; For The Chec Collaboration; For The Cta Consortium

2013-07-18T23:59:59.000Z

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