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


1

Direct Digital Control for Building HVAC Systems, 2nd edition  

Science Conference Proceedings (OSTI)

From the Publisher:Direct Digital Control for Building HVAC Systems, Second Edition, is thoroughly updated and expanded to include complete coverage of the architecture of modern digital control systems, distributed intelligence networked systems, communication ...

Michael J. L. Coffin

1998-06-01T23:59:59.000Z

2

Adaptive optimal control: an algorithm for direct digital control  

SciTech Connect

An algorithm for applying advanced control concepts in heating, ventilating, and air conditioning (HVAC) systems has been developed at the Los Alamos Scientific Laboratory (LASL). The algorithm uses optimal control and is adaptive in nature. Simulations for a solar heated and cooled building indicate that use of this algorithm can accomplish a substantial savings in auxiliary energy consumption. In this paper, the algorithm is described and its application is illustrated with a simple example. Simulation results for a more complex system are also presented. The hardware, including the digital computer, needed to implement this algorithm is briefly discussed.

Farris, D.R.; McDonald, T.E.

1980-01-01T23:59:59.000Z

3

Direct Digital Control in Air Conditioning Systems for Energy Efficiency  

E-Print Network (OSTI)

With the rapid development of Intelligent Buildings (IB), the Building Automation System (BAS) has come to control and manage the equipment in the building more and more scientifically, economically and rationally, which can not only raise the function and the level of the building, but also save energy. At present, air-conditioning design in internal commercial buildings is becoming more complex and enormous. The proportion of air conditioning systems in the whole building is getting larger. In order to control and manage the air-conditioning systems effectively and take full use of energy-saving technology, we apply computer control to the system of air automation control. This paper discusses direct digital control (DDC) in the air conditioning system in buildings.

Liu, W.; Ye, A.; Li, D.

2006-01-01T23:59:59.000Z

4

Direct Digital Control- A Tool for Energy Management of HVAC Systems  

E-Print Network (OSTI)

Direct digital control (DDC) applied to heating, ventilating, and air-conditioning (HVAC) systems corrects many of the deficiencies of conventional automatic temperature control systems. By applying new control sequences, DDC optimizes HVAC energy use. DDC can reduce HVAC operation and maintenance time and provide the environmental conditions needed to maximize production. DDC technology uses standalone, microprocessor based controllers. Controllers directly sense and process control variables (e.g. temperature, pressure) and provide a control signal to an actuator. Personal computers provide remote or local access to the digital controllers and give HVAC mechanics, energy managers, and facility engineers capabilities that conventional control systems do not offer. This paper discusses the most common deficiencies of conventionally controlled HVAC systems, advantages of DOC systems, and a case study retrofit from pneumatic control to digital control.

Swanson, K.

1993-03-01T23:59:59.000Z

5

Digital Surveying Directional Surveying Specialists | Open Energy  

Open Energy Info (EERE)

Digital Surveying Directional Surveying Specialists Digital Surveying Directional Surveying Specialists Jump to: navigation, search OpenEI Reference LibraryAdd to library Web Site: Digital Surveying Directional Surveying Specialists Author Directional Surveying Specialists Published Publisher Not Provided, 2012 DOI Not Provided Check for DOI availability: http://crossref.org Online Internet link for Digital Surveying Directional Surveying Specialists Citation Directional Surveying Specialists. Digital Surveying Directional Surveying Specialists [Internet]. 2012. [cited 2013/10/08]. Available from: http://www.digitalsurveying.co.za/services/geophysical-borehole-surveying/overview/optical-televiewer/ Retrieved from "http://en.openei.org/w/index.php?title=Digital_Surveying_Directional_Surveying_Specialists&oldid=690244"

6

Lighting Group: Controls: Advanced Digital Controls  

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

Advanced Digital Controls Advanced Digital Controls HPCBS Advanced Digital Controls Objective The goal of this project is to hasten the adoption of digital lighting control systems to allow commercial building operators to optimize the neergy performance of their lighting systems, implement demand responsive control, and improve occupant comfort and productivity. The specific objectives are as follows: (1) Advance the adoption of digital lighting control systems by working with industry to embed IBECS technology into existing analog control and DALI products, and by developing compelling demonstrations of digital control systems for evaluation by early adopters. (2) In collaboration with equipment manufacturers, produce digital lighting system prototypes that demonstrate the advantages of digitally controlled lighting systems to innovative property managers and other energy stakeholders. A digitally controlled lighting system consists of lights that are individually controllable via a network. The advantages of digital control are:

7

Stored program digital process controller  

DOE Patents (OSTI)

A digital process control function generator wherein a timing clock, in conjunction with programmable read only memories controls variables in a process with respect to time.

Stephenson, Dwight L. (Los Alamos, NM)

1977-01-04T23:59:59.000Z

8

Digitally controlled distributed phase shifter  

DOE Patents (OSTI)

A digitally controlled distributed phase shifter is comprised of N phase shifters. Digital control is achieved by using N binary length-weighted electrodes located on the top surface of a waveguide. A control terminal is attached to each electrode thereby allowing the application of a control signal. The control signal is either one of two discrete bias voltages. The application of the discrete bias voltages change the modal index of a portion of the waveguide that corresponds to a length of the electrode to which the bias voltage is applied, thereby causing the phase to change through the underlying portion of the waveguide. The digitally controlled distributed phase shift network has a total phase shift comprised of the sum of the individual phase shifters.

Hietala, V.M.; Kravitz, S.H.; Vawter, G.A.

1992-12-31T23:59:59.000Z

9

Digitally controlled distributed phase shifter  

DOE Patents (OSTI)

A digitally controlled distributed phase shifter is comprised of N phase shifters. Digital control is achieved by using N binary length-weighted electrodes located on the top surface of a waveguide. A control terminal is attached to each electrode thereby allowing the application of a control signal. The control signal is either one or two discrete bias voltages. The application of the discrete bias voltages changes the modal index of a portion of the waveguide that corresponds to a length of the electrode to which the bias voltage is applied, thereby causing the phase to change through the underlying portion of the waveguide. The digitally controlled distributed phase shift network has a total phase shift comprised of the sum of the individual phase shifters.

Hietala, V.M.; Kravitz, S.H.; Vawter, G.A.

1993-08-17T23:59:59.000Z

10

BIM-Based Digital Lighting Controls  

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

industry has been slow to embrace new technologies and concepts, and electrical installers are largely unfamiliar with digital control technologies. For a lighting controls...

11

Distributed digital processing and closed loop computer control of wastewater treatment  

Science Conference Proceedings (OSTI)

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

Bipin Mishra

1980-01-01T23:59:59.000Z

12

Digital Mapping Of Structurally Controlled Geothermal Features...  

Open Energy Info (EERE)

Gps Units And Pocket Computers Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Paper: Digital Mapping Of Structurally Controlled Geothermal Features With...

13

Digital Mapping Of Structurally Controlled Geothermal Features...  

Open Energy Info (EERE)

GPS Units And Pocket Computers Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Paper: Digital Mapping Of Structurally Controlled Geothermal Features...

14

From Packet to Power Switching: Digital Direct Load Scheduling  

E-Print Network (OSTI)

At present, the power grid has tight control over its dispatchable generation capacity but a very coarse control on the demand. Energy consumers are shielded from making price-aware decisions, which degrades the efficiency of the market. This state of affairs tends to favor fossil fuel generation over renewable sources. Because of the technological difficulties of storing electric energy, the quest for mechanisms that would make the demand for electricity controllable on a day-to-day basis is gaining prominence. The goal of this paper is to provide one such mechanisms, which we call Digital Direct Load Scheduling (DDLS). DDLS is a direct load control mechanism in which we unbundle individual requests for energy and digitize them so that they can be automatically scheduled in a cellular architecture. Specifically, rather than storing energy or interrupting the job of appliances, we choose to hold requests for energy in queues and optimize the service time of individual appliances belonging to a broad class whi...

Alizadeh, Mahnoosh; Thomas, Robert J

2012-01-01T23:59:59.000Z

15

Digital signal processing control of induction machine`s torque and stator flux utilizing the direct stator flux field orientation method  

SciTech Connect

This paper presents a review of the Direct Stator Flux Field Orientation control method. This method can be used to control an induction motor`s torque and flux directly and is the application of interest for this thesis. This control method is implemented without the traditional feedback loops and associated hardware. Predictions are made, by mathematical calculations, of the stator voltage vector. The voltage vector is determined twice a switching period. The switching period is fixed throughout the analysis. The three phase inverter duty cycle necessary to control the torque and flux of the induction machine is determined by the voltage space vector Pulse Width Modulation (PWM) technique. Transient performance of either the flux or torque requires an alternate modulation scheme which is also addressed in this thesis. A block diagram of this closed loop system is provided. 22 figs., 7 tabs.

Seiz, J.B.

1997-04-01T23:59:59.000Z

16

Digital Innovation and the Division of Innovative Labor: Digital Controls in the Automotive Industry  

Science Conference Proceedings (OSTI)

In this study of the U.S. automobile industry, we highlight the way the division of innovative labor across firms in the supply chain can be influenced by a particular form of digital innovation known as “digital control systems.” Digital ... Keywords: automotive industry, digital control hierarchy, digital controls, digital innovation, division of innovative labor, dual-product hierarchy, inclusionary hierarchy, mirroring hypothesis, systems integration

Jaegul Lee; Nicholas Berente

2012-09-01T23:59:59.000Z

17

A New Digital Lighting Control System  

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

A New Digital Lighting Control System A New Digital Lighting Control System Speaker(s): Charles Knuffke Date: June 29, 2010 - 12:00pm Location: 90-3122 Seminar Host/Point of Contact: Francis Rubinstein When various Lighting Controls components are discussed, they're usually slotted into separate "silos" - Occupancy Sensors, Relay Panels, Dimming Controls, and Daylighting Controls. Trying to combine two or more of these into a single system usually requires a fair amount of technical expertise and often help from different manufacturers. Combine that with the need under LEED to get these systems commissioned, often without detailed sequence of operation information, and that helps to explains why many view Lighting Controls as overly complex. And try to integrate the Lighting Controls into a larger overall building management system so their

18

Digital control of power transients in a nuclear reactor  

Science Conference Proceedings (OSTI)

An integrated, closed-loop, control system for on-line operations in nuclear power plants has been developed and demonstrated with an LSI-11/23 micro-processor on the 5 MWt fission reactor (MITR-II) that is operated by the Massachusetts Institute of Technology. This control system has inherent capabilities to perform on-line fault diagnosis, information display, sensor calibration, and measurement estimation. Recently, its scope has been extended to include the direct digital control of power changes ranging from 20-80% of the reactor's licensed limit. This controller differs from most of those discussed in theoretical and simulation studies by recognizing the non-linearity of reactor dynamics, calculating reactivity on-line, and controlling the rate of change of power by restricting both period and reactivity. The controller functions accurately using rods of non-linear worth in the presence of nonlinear feedback effects.

Bernard, J.A.; Lanning, D.D.; Ray, A.

1984-02-01T23:59:59.000Z

19

Digital Libraries for the Next Millennium: Challenges and Research Directions  

Science Conference Proceedings (OSTI)

The unprecedented growth of Internet technologies has made resources on the World Wide Web instantly accessible to various user communities through digital libraries. Since the early 1990s, there have been several digital library initiatives sponsored ... Keywords: digital library, metadata management, resource harvesting, resource sharing, socioeconomic context of digital library, software agent

Sudha Ram; Jinsoo Park; Dongwon Lee

1999-07-01T23:59:59.000Z

20

Remote Sensing and Control for Establishing and Maintaining Digital Irrigation  

E-Print Network (OSTI)

The remotely sensed data from an unknown location is transmitted in real time through internet and gathered in a PC. The data is collected for a considerable period of time and analyzed in PC as to assess the suitability and fertility of the land for establishing an electronic plantation in that area. The analysis also helps deciding the plantation of appropriate plants in the location identified. The system performing this task with appropriate transducers installed in remote area, the methodologies involved in transmission and data gathering are reported.. The second part of the project deals with data gathering from remote site and issuing control signals to remote appliances in the site; all performed through internet. Therefore, this control scheme is a duplex system monitoring the irrigation activities by collecting data in one direction and issuing commands on the opposite direction. This scheme maintains the digital irrigation systems effectively and efficiently as to utilize the resources optimally f...

cellatoglu, Akin

2012-01-01T23:59:59.000Z

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


21

A digital control algorithm for diesel engine governing  

SciTech Connect

The performance of a microprocessor based precision engine speed control system was investigated. A sample rate selection criteria is presented along with a procedure to implement a high performance digital PID control algorithm. The algorithm requires a digital speed sensor of 12 to 14 bits to minimize excessive fuel rack motion at a steady state due to digital quantization effects. Computer simulation and experimental test results of the algorithm are presented for an 1800 RPM, 125 Kilowatt engine generator set.

Garvey, P.C.

1985-01-01T23:59:59.000Z

22

Applied high resolution digital control for universal precision systems  

E-Print Network (OSTI)

This thesis describes the design and characterization of a high-resolution analog interface for dSPACE digital control systems and a high-resolution, high-speed data acquisition and control system. These designs are intended ...

Gawlik, Aaron John

2008-01-01T23:59:59.000Z

23

Digital Mapping Of Structurally Controlled Geothermal Features With GPS  

Open Energy Info (EERE)

Digital Mapping Of Structurally Controlled Geothermal Features With GPS Digital Mapping Of Structurally Controlled Geothermal Features With GPS Units And Pocket Computers Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Paper: Digital Mapping Of Structurally Controlled Geothermal Features With GPS Units And Pocket Computers Abstract Hand-held global positioning system (GPS) units and pocket personal computers (PCs) were used to map surface geothermal features at the Bradys Hot Springs and Salt Wells geothermal systems, Churchill County, Nevada, in less time and with greater accuracy than would have been possible with conventional mapping methods. Geothermal features that were mapped include fumaroles, mud pots, warm ground, sinter, and a variety of silicified rocks. In both areas, the digital mapping was able to resolve structural

24

Digital Mapping Of Structurally Controlled Geothermal Features With Gps  

Open Energy Info (EERE)

Digital Mapping Of Structurally Controlled Geothermal Features With Gps Digital Mapping Of Structurally Controlled Geothermal Features With Gps Units And Pocket Computers Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Paper: Digital Mapping Of Structurally Controlled Geothermal Features With Gps Units And Pocket Computers Details Activities (1) Areas (1) Regions (0) Abstract: Hand-held global positioning system (GPS) units and pocket personal computers (PCs) were used to map surface geothermal features at the Bradys Hot Springs and Salt Wells geothermal systems, Churchill County, Nevada, in less time and with greater accuracy than would have been possible with conventional mapping methods. Geothermal features that were mapped include fumaroles, mud pots, warm ground, sinter, and a variety of silicified rocks. In both areas, the digital mapping was able to resolve

25

Digital plasma control system and Alcasim simulation code for Alcator C-Mod  

E-Print Network (OSTI)

Abstract The Alcator C-Mod control system was upgraded to digital architecture DPCS (Digital Plasma Control System). The main features of the digital system are the high flexibility, robustness and maintainability. The ...

Ferrara, Marco, Ph. D. Massachusetts Institute of Technology

2005-01-01T23:59:59.000Z

26

Preventive Maintenance Practices for Digital Instrumentation and Control Systems  

Science Conference Proceedings (OSTI)

The lack of industry-accepted preventive maintenance (PM) guidance for digital instrumentation and control (I&C) systems may be leading to failures and inadequate maintenance activities, which may be insufficient or overly conservative. Nuclear plants are installing digital components and I&C systems, especially for non-safety-related applications. In some cases, the PM practices being used are the same as or minor modifications of the practices used for analog equipment and systems. ...

2013-08-12T23:59:59.000Z

27

Rigorous, Systematic Testing of Digital Instrumentation and Control Systems  

Science Conference Proceedings (OSTI)

Newly installed digital Instrumentation and Control (I&C) systems in nuclear plants can exhibit unexpected or undesired behaviors, sometimes with costly results such as unplanned trips or violations of technical specifications. Inadequate testing during digital system development and implementation has been identified both by the Institute of Nuclear Power Operations (INPO) and EPRI as a contributor to recent plant scrams, power reduction events, and unanticipated equipment responses. Therefore, ...

2012-12-01T23:59:59.000Z

28

Emergency Diesel Generator Digital Control System Upgrade Requirements  

Science Conference Proceedings (OSTI)

This interim report documents the development of system requirements for a digital control system upgrade to the station emergency diesel generators (EDGs). Operators of nuclear power plants (NPPs) must be able to replace and upgrade equipment in a cost-effective manner while continuing to meet safety and reliability requirements and controlling modification costs. Upgrades to plant equipment—especially instrumentation and control (I&C) systems—typically involve replacement of analog ...

2013-12-18T23:59:59.000Z

29

HVDC control system based on parallel digital signal processors  

Science Conference Proceedings (OSTI)

A numerical HVDC control system operating in real time has been developed for a simulator to be used for operator training. The control system, implemented with digital signal processors (DSPs), consists of typical HVDC control functions such as the synchronizing unit, the regulation unit, the protection unit, the firing unit, the tap changer and the reactive power regulation unit. Results from the steady-state and the transient performance validation tests carried out on the IREQ power system simulator are provided.

Maharsi, Y.; Do, V.Q.; Sood, V.K.; Casoria, S.; Belanger, J. [Hydro-Quebec, Varennes, Quebec (Canada)

1995-05-01T23:59:59.000Z

30

Medical Image Integrity Control Combining Digital Signature and Lossless Watermarking  

E-Print Network (OSTI)

Medical Image Integrity Control Combining Digital Signature and Lossless Watermarking W. Pan1,3 , G protection of medical content becomes a major issue of computer security. Since medical contents are more proposed as a com- plementary mechanism for medical data protection. In this paper, we focus

Paris-Sud XI, Université de

31

A visibility control system for collaborative digital table  

Science Conference Proceedings (OSTI)

We propose a novel display system that presents information with different levels of visibility to multiple users for enhancing collaborative multi-touch on digital tables by controlling visibility with a revolving polarizer. We first describe the system ... Keywords: CSCW, Display system, Entertainment, Public display

Satoshi Sakurai; Yoshifumi Kitamura; Sriram Subramanian; Fumio Kishino

2009-11-01T23:59:59.000Z

32

Digitally Controlled High Availability Power Supply  

SciTech Connect

This paper reports the design and test results on novel topology, high-efficiency, and low operating temperature, 1,320-watt power modules for high availability power supplies. The modules permit parallel operation for N+1 redundancy with hot swap capability. An embedded DSP provides intelligent start-up and shutdown, output regulation, general control and fault detection. PWM modules in the DSP drive the FET switches at 20 to 100 kHz. The DSP also ensures current sharing between modules, synchronized switching, and soft start up for hot swapping. The module voltage and current have dedicated ADCs (>200 kS/sec) to provide pulse-by-pulse output control. A Dual CAN bus interface provides for low cost redundant control paths. Over-rated module components provide high reliability and high efficiency at full load. Low on-resistance FETs replace conventional diodes in the buck regulator. Saturable inductors limit the FET reverse diode current during switching. The modules operate in a two-quadrant mode, allowing bipolar output from complimentary module groups. Controllable, low resistance FETs at the input and output provide fault isolation and allow module hot swapping.

MacNair, David; /SLAC

2008-09-25T23:59:59.000Z

33

Modern Boiler Control and Why Digital Systems are Better  

E-Print Network (OSTI)

Steam generation in petrochemical plants and refineries is in a state of change. Expensive fuels have resulted in greater use of waste heat recovery boilers and other energy conservation measures. As a result, many conventional boilers have been mothballed. Improved flue gas analyzers and digital controls are replacing less efficient and less reliable control hardware. As the production of steam becomes decentralized, control systems needed to meet expanded plant objectives must be installed. Production, engineering and maintenance personnel are finding increased need to learn more about this specialized control area. This article will discuss conventional controls systems common in industrial boilers plus improvements made possible with currently available hardware.

Hughart, C. L.

1983-01-01T23:59:59.000Z

34

Digital multimode buck converter control with loss-minimizing synchronous rectifier adaptation  

E-Print Network (OSTI)

Abstract—This paper develops a multimode control strategy which allows for efficient operation of the buck converter over a wide load range. A method for control of synchronous rectifiers as a direct function of the load current is introduced [1]. The function relating the synchronous-rectifier timing to the load current is optimized on-line with a gradient power-loss-minimizing algorithm. Only low-bandwidth measurements of the load current and a power-loss-related quantity are required, making the technique suitable for digital controller implementations. Compared to alternative loss-minimizing approaches, this method has superior adjustment speed and robustness to disturbances, and can simultaneously optimize multiple parameters. The proposed synchronous-rectifier control also accomplishes an automatic, optimal transition to discontinuous-conduction mode at light load. Further, by imposing a minimum duty-ratio, the converter automatically enters pulse-skipping mode at very light load. Thus, the same controller structure can be used in both fixed-frequency pulsewidth modulation and variable-frequency pulse-skipping modes. These techniques are demonstrated on a digitally-controlled 100-W buck converter. Index Terms—Adaptive control, dead-time, digital control, gradient methods, multimode control, optimization methods, pulse skipping, pulsewidth modulated (PWM) power converters, pulsewidth modulation (PWM), synchronous rectifier (SR), variable frequency control. Fig. 1. Buck converter with SR (M), and the corresponding MOSFET control signals.

Angel V. Peterchev; Seth R. S

2006-01-01T23:59:59.000Z

35

Thermal Modeling of Direct Digital Melt Deposition Processes  

Science Conference Proceedings (OSTI)

The Research on Controlling the Pre-Bending Deformation before Straightening and the Residual Stresses after Straightening of 100-Meter Rail.

36

Digitally Controlled High Availability Power Supply  

SciTech Connect

This paper will report on the test results of a prototype 1320 watt power module for a high availability power supply. The module will allow parallel operation for N+1 redundancy with hot swap capability. The two quadrant output of each module allows pairs of modules to provide a 4 quadrant (bipolar) operation. Each module employs a novel 4 FET buck regulator arranged in a bridge configuration. Each side of the bridge alternately conducts through a small saturable ferrite that limits the reverse current in the FET body diode during turn off. This allows hard switching of the FETs with low switching losses. The module is designed with over-rated components to provide high reliability and better then 97% efficiency at full load. The modules use a Microchip DSP for control, monitoring, and fault detection. The switching FETS are driven by PWM modules in the DSP at 60 KHz. A Dual CAN bus interface provides for low cost redundant control paths. The DSP will also provide current sharing between modules, synchronized switching, and soft start up for hot swapping. The input and output of each module have low resistance FETs to allow hot swapping and isolation of faulted units.

MacNair, David; /SLAC

2009-05-07T23:59:59.000Z

37

Hazard Analysis Methods for Digital Instrumentation and Control Systems  

Science Conference Proceedings (OSTI)

This report documents an investigation of the use of various hazard and failure analysis methods to reveal potential vulnerabilities in digital instrumentation and control (I&C) systems before they are put into operation. The report looks at six approaches, ranging from well-established practices to novel methods still transitioning from academic demonstrations to practical, realistic applications. It includes step-by-step procedures and worked examples, applying each of the methods to sample ...

2013-06-27T23:59:59.000Z

38

Testing a new direct load control power line communication system  

SciTech Connect

South Carolina Electric and Gas is currently performing direct load control communications over power lines without using a power line carrier. This is the result of testing a load management system that combines the existing substation solid-state recording with voltage regulation capability. Using the solid-state recorder's extended control functions, the existing substation tap changer, a new patent-pending power line communications technique, and a patented voltage-step load control receiver, the system extends normal two-way communication between the utility operations and the substation with a one-way power line link to virtually any load. By varying the voltage level slightly, the system digitizes up to 32 different load control messages. The new voltage-step communication technique uses the substation's load tap changer to communicate one-way with the receivers over existing power lines. South Carolina Electric and Gas and the manufacturers have been performing a two-phase test of the load control system. Phase one testing showed that the percentage of successful load control message reception was 98%. Phase two testing is still in progress. Results to date show no deterioration of reception or equipment. Conclusions thus far are that the load management system is compatible with all installed utility equipment, and offers reliable direct load control.

Weers, D.D.; Shamsedin, M.A.

1987-07-01T23:59:59.000Z

39

Definition: Direct Control Load Management | Open Energy Information  

Open Energy Info (EERE)

Control Load Management Jump to: navigation, search Dictionary.png Direct Control Load Management Demand-Side Management that is under the direct control of the system operator....

40

A Digitally Controlled dB-Linear CMOS AGC for Low Voltage Mixed Signal Applications  

Science Conference Proceedings (OSTI)

A new digitally controlled current mode automatic gain control (AGC) circuit is presented. The proposed circuit uses a novel digital control technique to provide a dB-linear gain control. The circuit is based on binary weighted current mirrors leading ...

Hassan O. Elwan; Mohammed Ismail; Tuna B. Tarim

1998-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "direct digital controls" 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

Applying Human Factors Evaluation and Design Guidance to a Nuclear Power Plant Digital Control System  

SciTech Connect

The United States (U.S.) nuclear industry, like similar process control industries, has moved toward upgrading its control rooms. The upgraded control rooms typically feature digital control system (DCS) displays embedded in the panels. These displays gather information from the system and represent that information on a single display surface. In this manner, the DCS combines many previously separate analog indicators and controls into a single digital display, whereby the operators can toggle between multiple windows to monitor and control different aspects of the plant. The design of the DCS depends on the function of the system it monitors, but revolves around presenting the information most germane to an operator at any point in time. DCSs require a carefully designed human system interface. This report centers on redesigning existing DCS displays for an example chemical volume control system (CVCS) at a U.S. nuclear power plant. The crucial nature of the CVCS, which controls coolant levels and boration in the primary system, requires a thorough human factors evaluation of its supporting DCS. The initial digital controls being developed for the DCSs tend to directly mimic the former analog controls. There are, however, unique operator interactions with a digital vs. analog interface, and the differences have not always been carefully factored in the translation of an analog interface to a replacement DCS. To ensure safety, efficiency, and usability of the emerging DCSs, a human factors usability evaluation was conducted on a CVCS DCS currently being used and refined at an existing U.S. nuclear power plant. Subject matter experts from process control engineering, software development, and human factors evaluated the DCS displays to document potential usability issues and propose design recommendations. The evaluation yielded 167 potential usability issues with the DCS. These issues should not be considered operator performance problems but rather opportunities identified by experts to improve upon the design of the DCS. A set of nine design recommendations was developed to address these potential issues. The design principles addressed the following areas: (1) color, (2) pop-up window structure, (3) navigation, (4) alarms, (5) process control diagram, (6) gestalt grouping, (7) typography, (8) terminology, and (9) data entry. Visuals illustrating the improved DCS displays accompany the design recommendations. These nine design principles serve as the starting point to a planned general DCS style guide that can be used across the U.S. nuclear industry to aid in the future design of effective DCS interfaces.

Thomas Ulrich; Ronald Boring; William Phoenix; Emily Dehority; Tim Whiting; Jonathan Morrell; Rhett Backstrom

2012-08-01T23:59:59.000Z

42

A digital vibrating magnetic gyrometer using a control motor DSP TMS320F243  

E-Print Network (OSTI)

A digital vibrating magnetic gyrometer using a control motor DSP TMS320F243 G. Baudoin(1) , O processing system to control a vibrating magnetic gyrometer (VMG). This low cost angular speed sensor has is implemented on a Digital Signal Processor TMS320F243 dedicated to motor control. This DSP is perfectly suited

Baudoin, Geneviève

43

Design and implementation of digital linear control systems on reconfigurable hardware  

Science Conference Proceedings (OSTI)

The implementation of large linear control systems requires a high amount of digital signal processing. Here, we show that re-configurable hardware allows the design of fast yet flexible control systems. After discussing the basic concepts for the design ... Keywords: digital linear control, mechatronic systems, reconfigurable hardware

Marcus Bednara; Klaus Danne; Markus Deppe; Oliver Oberschelp; Frank Slomka; Jürgen Teich

2003-01-01T23:59:59.000Z

44

A superconducting bandpass delta-sigma modulator for direct analog-to-digital conversion of microwave radio  

E-Print Network (OSTI)

Direct analog-to-digital conversion of multi-GHz radio frequency (RF) signals is the ultimate goal in software radio receiver design but remains a daunting challenge for any technology. This thesis examines the potential ...

Bulzacchelli, John F. (John Francis)

2003-01-01T23:59:59.000Z

45

An Investigation of Digital Instrumentation and Control System Failure Modes  

SciTech Connect

A study sponsored by the Nuclear Regulatory Commission study was conducted to investigate digital instrumentation and control (DI&C) systems and module-level failure modes using a number of databases both in the nuclear and non-nuclear industries. The objectives of the study were to obtain relevant operational experience data to identify generic DI&C system failure modes and failure mechanisms, and to obtain generic insights, with the intent of using results to establish a unified framework for categorizing failure modes and mechanisms. Of the seven databases studied, the Equipment Performance Information Exchange database was found to contain the most useful data relevant to the study. Even so, the general lack of quality relative to the objectives of the study did not allow the development of a unified framework for failure modes and mechanisms of nuclear I&C systems. However, an attempt was made to characterize all the failure modes observed (i.e., without regard to the type of I&C equipment under consideration) into common categories. It was found that all the failure modes identified could be characterized as (a) detectable/preventable before failures, (b) age-related failures, (c) random failures, (d) random/sudden failures, or (e) intermittent failures. The percentage of failure modes characterized as (a) was significant, implying that a significant reduction in system failures could be achieved through improved online monitoring, exhaustive testing prior to installation, adequate configuration control or verification and validation, etc.

Korsah, Kofi [ORNL; Cetiner, Mustafa Sacit [ORNL; Muhlheim, Michael David [ORNL; Poore III, Willis P [ORNL

2010-01-01T23:59:59.000Z

46

Design of optimal digital controller for stable super-high-speed permanent-magnet synchronous  

E-Print Network (OSTI)

Design of optimal digital controller for stable super-high-speed permanent-magnet synchronous motor collaborative design scheme of a super-high-speed permanent-magnet synchronous motor (PMSM) and its digital controller is presented, which provides a low-cost but highly efficient motor system with guaranteed

Wu, Shin-Tson

47

Exact and Heuristic Approaches for Directional Sensor Control  

E-Print Network (OSTI)

Aug 29, 2013 ... The Directional Sensor Control problem (DSCP) consists in assigning a direction of view to each sensor. The location of the targets is known ...

48

Digital making : exploring design with computer controlled fabrication  

E-Print Network (OSTI)

This thesis examines the underlying issues innate to the design process of developing architectural solutions using the digital for "making" architecture, focusing on architectural production. It proposes an alternative ...

Kashyap, Sameer, 1978-

2004-01-01T23:59:59.000Z

49

Direction control of bilinear systems. I  

E-Print Network (OSTI)

We consider the general bilinear control systems in three-dimensional Euclidean space which satisfy the LARC and have an open control set U; and give sufficient controllability conditions for corresponding projected systems on two-dimensional sphere.

Choque, Abdon

2010-01-01T23:59:59.000Z

50

NOx Sensor for Direct Injection Emission Control  

DOE Green Energy (OSTI)

The Electricore/Delphi team continues to leverage the electrochemical planar sensor technology that has produced stoichiometric planar and wide range oxygen sensors as the basis for development of a NOx sensor. Zirconia cell technology with an integrated heater will provide the foundation for the sensor structure. Proven materials and packaging technology will help to ensure a cost-effective approach to the manufacture of this sensor. The electronics technique and interface is considered to be an area where new strategies need to be employed to produce higher S/N ratios of the NOx signal with emphasis on signal stability over time for robustness and durability Both continuous mode and pulse mode control techniques are being evaluated. Packaging the electronics requires careful design and circuit partitioning so that only the necessary signal conditioning electronics are coupled directly in the wiring harness, while the remainder is situated within the ECM for durability and costs reasons. This task continues to be on hold due to the limitation that the definition of the interface electronics was unavailable until very late in the project. The sense element is based on the amperometric method utilizing integrated alumina and zirconia ceramics. Precious metal electrodes are used to form the integrated heater, the cell electrodes and leads. Inside the actual sense cell structure, it is first necessary to separate NOx from the remaining oxygen constituents of the exhaust, without reducing the NOx. Once separated, the NOx will be measured using a measurement cell. Development or test coupons have been used to facilitate material selection and refinement, cell, diffusion barrier, and chamber development. The sense element currently requires elaborate interconnections. To facilitate a robust durable connection, mechanical and metallurgical connections are under investigation. Materials and process refinements continue to play an important role in the development of the sensor.

Betteridge, William J

2006-02-28T23:59:59.000Z

51

Failure Analysis of Digital Instrumentation and Control Equipment and Systems  

Science Conference Proceedings (OSTI)

This interim report documents an investigation of digital system failure analysis techniques that may be of use in improving the effectiveness and efficiency of currently applied techniques. The study considered both top-down approaches, such as fault tree analysis, and bottom-up approaches, such as failure modes and effects analysis (FMEA), applying them to realistic examples to assess their potential value.

2011-12-21T23:59:59.000Z

52

Human Factors Guidance for Control Room and Digital Human-System Interface Design and Modification  

Science Conference Proceedings (OSTI)

Operators of nuclear power plants face a significant challenge designing and modifying control rooms that will be produced at various stages of instrumentation and control (I&C) modernization. This report provides guidance on planning, specifying, designing, implementing, operating, maintaining, and training for modernized control rooms and digital human-system interfaces.

2005-12-08T23:59:59.000Z

53

Exact and Heuristic Approaches for Directional Sensor Control  

E-Print Network (OSTI)

Handbook of Metaheuristics, vol. 57, pp. 321–353. Kluwer Academic Publishers ( 2002). 10. Ravi, S., Mittelman, H.D., Chong, E.K.P.: Directional sensor control ...

54

From Basic Control to Optimized Systems-Applying Digital Control Systems to Steam Boilers  

E-Print Network (OSTI)

This presentation examines the application of Distributed Digital Controls in order to review the application of this recent control technology towards Steam Boilers in a step-by-step manner. The main purpose of a steam generating boiler is to supply enough steam to meet process demands. Steam conditions must remain as stable as possible, because variations in the steam system can affect downstream processes. Pressure variations in the steam supply header, for example, can have a severe effect on heat transferred to a process. If that process suffers an upset, unstable conditions can propagate from one process to another via the steam supply system. The closer the tolerance in the boiler control system, the smaller the steam header disturbances will be. This reduces the interaction, or 'coupling', of upsets between steam-consuming processes. Also, it may reduce the complexity of instrumentation needed for those processes. If the boiler control system can eliminate major upsets, the downstream processes won't need exotic schemes to compensate for such upsets.

Hockenbury, W. D.

1982-01-01T23:59:59.000Z

55

Research on Maintenance Optimization for Steam Turbine Digital Electro-Hydraulic Control System  

Science Conference Proceedings (OSTI)

As the substitute of mechanical hydraulic governing system, steam turbine digital electro-hydraulic control system presents different maintenance characteristics. If the traditional maintenance strategy is still adopted, that is the replacement or inspection ... Keywords: DEH control system, maintenance optimization, risk evaluation, fault tree

Zhenhe Wang; Shaocong Guo

2009-11-01T23:59:59.000Z

56

Analog and digital control of an electronic throttle valve  

E-Print Network (OSTI)

Two electronic throttler controllers were designed and implemented for an automotive throttle valve on a four-cylinder, spark-ignition gasoline engine. The first controller was designed using operational amplifiers and ...

Martins, Tomás V

2012-01-01T23:59:59.000Z

57

Definition: Direct Load Control Device | Open Energy Information  

Open Energy Info (EERE)

Load Control Device Load Control Device Jump to: navigation, search Dictionary.png Direct Load Control Device A remotely controllable switch that can turn power to a load or appliance on or off. Such a device could also be used to regulate the amount of power that a load can consume. Direct load control devices can be operated by a utility or third party energy provider to reduce a customer's energy demand at certain times.[1] Related Terms power, load References ↑ https://www.smartgrid.gov/category/technology/direct_load_control_device [[Ca LikeLike UnlikeLike You like this.Sign Up to see what your friends like. tegory: Smart Grid Definitionssmart grid,smart grid, |Template:BASEPAGENAME]]smart grid,smart grid, Retrieved from "http://en.openei.org/w/index.php?title=Definition:Direct_Load_Control_Device&oldid=502631

58

Adaptive feed-forward digital control of GTA welding  

SciTech Connect

Three control functions are performed - seam tracking, weld pattern selection, and pattern scaling. The controller uses a computer program specifically written for welding. Its use with a welding unit is sufficiently simple that it may be mastered by a person having conventional welding skills. 27 refs.

Scott, J.J.; Brandt, H.

1982-03-01T23:59:59.000Z

59

Digital Control of a Six-Axis Manipulator  

E-Print Network (OSTI)

This paper describes a scheme for providing low-level control of a multi-link serial manipulator. The goal was to achieve adaptive behavior without making assumptions about the environment.

Blanchard, David C.

60

Digital Self Triggered Robust Control of Nonlinear Systems  

E-Print Network (OSTI)

In this paper we develop novel results on self triggering control of nonlinear systems, subject to perturbations and actuation delays. First, considering an unperturbed nonlinear system with bounded actuation delays, we provide conditions that guarantee the existence of a self triggering control strategy stabilizing the closed--loop system. Then, considering parameter uncertainties, disturbances, and bounded actuation delays, we provide conditions guaranteeing the existence of a self triggering strategy, that keeps the state arbitrarily close to the equilibrium point. In both cases, we provide a methodology for the computation of the next execution time. We show on an example the relevant benefits obtained with this approach, in terms of energy consumption, with respect to control algorithms based on a constant sampling, with a sensible reduction of the average sampling time.

Di Benedetto, M D; D'Innocenzo, A

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "direct digital controls" 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

Methods and Tools for Evaluating Digital Control System Architectures  

Science Conference Proceedings (OSTI)

Instrumentation and control (I&C) component, system, and plant architectures are fundamentally important to achieving key objectives for nuclear power, especially those related to safety and high dependability. However, recent reviews of nuclear plant operating experience have demonstrated that there is room for improvement in non-safety architectures to improve fault tolerance and plant dependability. Also, experience with disparate regulatory approaches toward review and acceptance of specific ...

2013-07-31T23:59:59.000Z

62

Lessons from our elders: identifying obstacles to digital literacy through direct engagement  

Science Conference Proceedings (OSTI)

In today's world, technological change outpaces many people's ability to comprehend or trust it, let alone embrace it. It is vitally important that developers of pervasive technology for the elderly are grounded in the needs, experience, and capabilities ... Keywords: community outreach, digital literacy, elderly, gerontechnology

Shreya Kumar, Leo C. Ureel, II, Harriet King, Charles Wallace

2013-05-01T23:59:59.000Z

63

A fuzzy logic based approach to direct load control  

SciTech Connect

Demand side management programs are strategies designed to alter the shape of the load curve. In order to successfully implement such a strategy, customer acceptance of the program is vital. It is thus desirable to design a model for direct load control which may accommodate customer preferences. This paper presents a methodology for optimizing both customer satisfaction and utility unit commitment savings, based on a fuzzy load model for the direct load control of appliances.

Bhattacharyya, K.; Crow, M.L. [Univ. of Missouri, Rolla, MO (United States). Dept. of Electrical Engineering

1996-05-01T23:59:59.000Z

64

Method and apparatus for digitally based high speed x-ray spectrometer for direct coupled use with continuous discharge preamplifiers  

DOE Patents (OSTI)

A high speed, digitally based, signal processing system is disclosed which accepts directly coupled input data from a detector with a continuous discharge type preamplifier and produces a spectral analysis of the x-rays illuminating the detector. The system`s principal elements are an analog signal conditioning section, a combinatorial logic section which implements digital triangular filtering and pileup inspection, and a microprocessor which accepts values captured by the logic section and uses them to compute x-ray energy values. Operating without pole-zero correction, the system achieves high resolution by capturing, in conjunction with each peak value from the digital filter, an associated value of the unfiltered signal, and using this latter signal to correct the former for errors which arise from its local slope terms. This correction greatly reduces both energy resolution degradation and peak centroid shifting in the output spectrum as a function of input count rate. When the noise of this correction is excessive, a modification allows two filtered averages of the signal to be captured and a corrected peak amplitude computed therefrom. 14 figs.

Warburton, W.K.

1998-06-30T23:59:59.000Z

65

Method and apparatus for digitally based high speed x-ray spectrometer for direct coupled use with continuous discharge preamplifiers  

DOE Patents (OSTI)

A high speed, digitally based, signal processing system which accepts directly coupled input data from a detector with a continuous discharge type preamplifier and produces a spectral analysis of the x-rays illuminating the detector. The system's principal elements are an analog signal conditioning section, a combinatorial logic section which implements digital triangular filtering and pileup inspection, and a microprocessor which accepts values captured by the logic section and uses them to compute x-ray energy values. Operating without pole-zero correction, the system achieves high resolution by capturing, in conjunction with each peak value from the digital filter, an associated value of the unfiltered signal, and using this latter signal to correct the former for errors which arise from its local slope terms. This correction greatly reduces both energy resolution degradation and peak centroid shifting in the output spectrum as a function of input count rate. When the noise of this correction is excessive, a modification allows two filtered averages of the signal to be captured and a corrected peak amplitude computed therefrom.

Warburton, William K. (1300 Mills St., Menlo Park, CA 94025)

1998-01-01T23:59:59.000Z

66

Digital control systems in nuclear power plants: Failure information, modeling concepts, and applications. Revision 1  

SciTech Connect

This report briefly describes some current applications of advanced computerized digital display and control systems at US commercial nuclear power plants and presents the results of a literature search that was made to gather information on the reliability of these systems. Both hardware and software reliability were addressed in this review. Only limited failure rate information was found, with the chemical process industry being the primary source of information on hardware failure rates and expert opinion the primary source for software failure rates. Safety-grade digital control systems are typically installed on a functional like-for-like basis, replacing older analog systems without substantially changing interactions with other plant systems. Future work includes performing a limited probabilistic risk assessment of a representative DCS to assess its risk significance.

Galyean, W.J.

1993-06-23T23:59:59.000Z

67

Digital Object Identifier 10.1109/MCS.2010.937745 1066-033X/10/$26.002010IEEE OCTOBER 2010 IEEE CONTROL SYSTEMS MAGAZINE 23  

E-Print Network (OSTI)

System. Order No. A26-5512. [23] J. M. Lane, "Digital computer control of a catalytic reforming unit

Regruto, Diego

68

Current status of DIII-D real-time digital plasma control  

Science Conference Proceedings (OSTI)

This paper describes the current status of real-time digital plasma control for the DIII-D tokamak. The digital plasma control system (PCS) has been in place at DIII-D since the early 1990s and continues to expand and improve in its capabilities to monitor and control plasma parameters for DIII-D fusion science experiments. The PCs monitors over 200 tokamak parameters from the DIII-D experiment using a real-time data acquisition system that acquires a new set of samples once every 60 {micro}s. This information is then used in a number of feedback control algorithms to compute and control a variety of parameters including those affecting plasma shape and position. A number of system related improvements has improved the usability and flexibility of the DIII-D PCS. These include more graphical user interfaces to assist in entering and viewing the large and ever growing number of parameters controlled by the PCS, increased interaction and accessibility from other DIII-D applications, and upgrades to the computer hardware and vended software. Future plans for the system include possible upgrades of the real-time computers, further links to other DIII-D diagnostic measurements such as real-time Thomson scattering analysis, and joint collaborations with other tokamak experiments including the NSTX at Princeton.

Penaflor, B.G.; Piglowski, D.A.; Ferron, J.R.; Walker, M.L.

1999-06-01T23:59:59.000Z

69

An ultra low-power digitally-controlled buck converter IC for cellular phone applications  

E-Print Network (OSTI)

Abstract — This paper describes a dual-mode digitallycontrolled buck converter IC for cellular phone applications. An architecture employing internal power management is introduced to ensure voltage compatibility between a singlecell lithium-ion battery voltage and a low voltage integrated circuit technology. Special purpose analog and digital interface elements are developed. These include a ring-oscillator based ADC (ring-ADC), which is nearly entirely synthesizable, robust against switching noise, and has flexible resolution control, and a very low power ring oscillator-multiplexer based Digital PWM generation module (ring-MUX DPWM). The chip, which includes an output power stage rated for 400 mA, occupies 2mm 2 active area in 0.25-µm CMOS. Very high efficiencies are achieved over a load range of 0.1 to 400 mA. Measured quiescent current in PFM mode is 4 µA. I.

Jinwen Xiao; Angel Peterchev; Jianhui Zhang; Seth Sanders

2004-01-01T23:59:59.000Z

70

Human Factors Engineering (HFE) Computer Based Training Module for Utilities Involved in Implementing Digital Instrumentation and Control Systems  

Science Conference Proceedings (OSTI)

This product provides a brief computer-based training (CBT) module on human factors engineering (HFE) that was developed explicitly to be included in training materials on digital instrumentation and control (I&C) issues for new nuclear power plants (NPPs). This module is intended for engineers, technicians and project managers responsible for design, implementation, testing, operation and maintenance of digital I&C systems in NPPs. The primary focus of the HFE training is the main control room and its h...

2012-03-23T23:59:59.000Z

71

Techniques for high-performance digital frequency synthesis and phase control  

E-Print Network (OSTI)

This thesis presents a 3.6-GHz, 500-kHz bandwidth digital [delta][sigma] frequency synthesizer architecture that leverages a recently invented noise-shaping time-to-digital converter (TDC) and an all-digital quantization ...

Hsu, Chun-Ming, Ph. D. Massachusetts Institute of Technology

2008-01-01T23:59:59.000Z

72

The Direct Neural Control Applied to the Position Control in Hydraulic Servo System  

Science Conference Proceedings (OSTI)

This study utilizes the direct neural control (DNC) based on back propagation neural networks (BPN) with specialized learning architecture applied to control the position of a cylinder rod in an electro-hydraulic servo system (EHSS). The proposed neural ... Keywords: Back propagation, Electro-hydraulic servo system, Neural networks, Position control

Yuan Kang; Yi-Wei Chen; Yeon-Pun Chang; Ming-Huei Chu

2008-09-01T23:59:59.000Z

73

Development of a digital control unit to displace diesel fuel with natural gas  

DOE Green Energy (OSTI)

Full Circle Engineering (FCE), supported by the Colorado School of Mines (CSM), proposed a Small Business CRADA with Allied Signal Federal Manufacturing & Technologies/Kansas City (FM&T/KC) for the development of a fumigation digital control unit (DCU) that would allow the displacement of diesel fuel with natural gas. Nationwide, diesel trucks and buses consumed over 21 billion gallons of fuel in 1992. The development of systems that allow the use of alternative fuels, natural gas in particular, for transportation would significantly reduce emissions and pollutants. It would also help implement DOE`s mandate for energy security (use of domestic fuels) required by the Energy Policy Act (EPACT).

Talbott, A.D. [AlliedSignal FM& T, Kansas City, MO (United States)]|[Full Circle Engineering, Northglenn, CO (United States)

1997-03-01T23:59:59.000Z

74

Effects of Digital Instrumentation and Control Defense-in-Depth and Diversity on Risk in Nuclear Power Plants  

Science Conference Proceedings (OSTI)

Preventing or mitigating the effects of software common-cause failure (CCF) remains an open technical and regulatory issue for both new plants and for digital upgrades at operating plants. The concern is the potential for CCFs to disable multiple equipment trains or systems that use identical software-based components. Instrumentation and control (I&C) designers and implementers need to ensure that the plants have adequate protection against digital CCF, in some cases adding diverse backups or operator a...

2009-12-23T23:59:59.000Z

75

Direct versus Facility Centric Load Control for Automated Demand Response  

SciTech Connect

Direct load control (DLC) refers to the scenario where third party entities outside the home or facility are responsible for deciding how and when specific customer loads will be controlled in response to Demand Response (DR) events on the electric grid. Examples of third parties responsible for performing DLC may be Utilities, Independent System Operators (ISO), Aggregators, or third party control companies. DLC can be contrasted with facility centric load control (FCLC) where the decisions for how loads are controlled are made entirely within the facility or enterprise control systems. In FCLC the facility owner has more freedom of choice in how to respond to DR events on the grid. Both approaches are in use today in automation of DR and both will continue to be used in future market segments including industrial, commercial and residential facilities. This paper will present a framework which can be used to differentiate between DLC and FCLC based upon where decisions are made on how specific loads are controlled in response to DR events. This differentiation is then used to compare and contrast the differences between DLC and FCLC to identify the impact each has on:(1)Utility/ISO and third party systems for managing demand response, (2)Facility systems for implementing load control, (3)Communications networks for interacting with the facility and (4)Facility operators and managers. Finally a survey of some of the existing DR related specifications and communications standards is given and their applicability to DLC or FCLC. In general FCLC adds more cost and responsibilities to the facilities whereas DLC represents higher costs and complexity for the Utility/ISO. This difference is primarily due to where the DR Logic is implemented and the consequences that creates. DLC may be more certain than FCLC because it is more predictable - however as more loads have the capability to respond to DR signals, people may prefer to have their own control of end-use loads and FCLC systems. Research is needed to understand the predictability of FCLC which is related to the perceived value of the DR from the facility manager or home owner's perspective.

Koch, Ed; Piette, Mary Ann

2009-11-06T23:59:59.000Z

76

The Effect of Degraded Digital Instrumentation and Control systems on Human-system Interfaces and Operator Performance  

SciTech Connect

Integrated digital instrumentation and control (I&C) systems in new and advanced nuclear power plants (NPPs) will support operators in monitoring and controlling the plants. Even though digital systems typically are expected to be reliable, their potential for degradation or failure significantly could affect the operators performance and, consequently, jeopardize plant safety. This U.S. Nuclear Regulatory Commission (NRC) research investigated the effects of degraded I&C systems on human performance and on plant operations. The objective was to develop technical basis and guidance for human factors engineering (HFE) reviews addressing the operator's ability to detect and manage degraded digital I&C conditions. We reviewed pertinent standards and guidelines, empirical studies, and plant operating experience. In addition, we evaluated the potential effects of selected failure modes of the digital feedwater control system of a currently operating pressurized water reactor (PWR) on human-system interfaces (HSIs) and the operators performance. Our findings indicated that I&C degradations are prevalent in plants employing digital systems, and the overall effects on the plant's behavior can be significant, such as causing a reactor trip or equipment to operate unexpectedly. I&C degradations may affect the HSIs used by operators to monitor and control the plant. For example, deterioration of the sensors can complicate the operators interpretation of displays, and sometimes may mislead them by making it appear that a process disturbance has occurred. We used the findings as the technical basis upon which to develop HFE review guidance.

OHara, J.M.; Gunther, B.; Martinez-Guridi, G. (BNL); Xing, J.; Barnes, V. (NRC)

2010-11-07T23:59:59.000Z

77

A Markov Model for Assessing the Reliability of a Digital Feedwater Control System  

SciTech Connect

A Markov approach has been selected to represent and quantify the reliability model of a digital feedwater control system (DFWCS). The system state, i.e., whether a system fails or not, is determined by the status of the components that can be characterized by component failure modes. Starting from the system state that has no component failure, possible transitions out of it are all failure modes of all components in the system. Each additional component failure mode will formulate a different system state that may or may not be a system failure state. The Markov transition diagram is developed by strictly following the sequences of component failures (i.e., failure sequences) because the different orders of the same set of failures may affect the system in completely different ways. The formulation and quantification of the Markov model, together with the proposed FMEA (Failure Modes and Effects Analysis) approach, and the development of the supporting automated FMEA tool are considered the three major elements of a generic conceptual framework under which the reliability of digital systems can be assessed.

Chu,T.L.; Yue, M.; Martinez-Guridi, G.; Lehner, J.

2009-02-11T23:59:59.000Z

78

BACNET AND ANALOG/DIGITAL INTERFACES OF THE BUILDING CONTROLS VIRTUAL TEST BED  

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

6E 6E BacNet and Analog/Digital Interfaces of the Building Controls Virtual Testbed Thierry Stephane Nouidui, Michael Wetter, Zhengwei Li, Xiufeng Pang, Prajesh Bhattachayra, Philip Haves November 2011 DISCLAIMER This document was prepared as an account of work sponsored by the United States Government. While this document is believed to contain correct information, neither the United States Government nor any agency thereof, nor The Regents of the University of California, nor any of their employees, makes any warranty, express or implied, or assumes any legal responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or

79

Digital Sensor Technology  

SciTech Connect

The nuclear industry has been slow to incorporate digital sensor technology into nuclear plant designs due to concerns with digital qualification issues. However, the benefits of digital sensor technology for nuclear plant instrumentation are substantial in terms of accuracy, reliability, availability, and maintainability. This report demonstrates these benefits in direct comparisons of digital and analog sensor applications. It also addresses the qualification issues that must be addressed in the application of digital sensor technology.

Ted Quinn; Jerry Mauck; Richard Bockhorst; Ken Thomas

2013-07-01T23:59:59.000Z

80

Human Factors Guidance for Control Room and Digital Human-System Interface Design and Modification, Guidelines for Planning, Specification, Design, Licensing, Implementation, Training, Operation and Maintenance  

Science Conference Proceedings (OSTI)

Nuclear plant operators face a significant challenge designing and modifying control rooms. This report provides guidance on planning, designing, implementing and operating modernized control rooms and digital human-system interfaces.

R. Fink, D. Hill, J. O'Hara

2004-11-30T23:59:59.000Z

Note: This page contains sample records for the topic "direct digital controls" 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

A generalized adaptive predictive controller design-based direct identification for district heating system  

Science Conference Proceedings (OSTI)

To realize accurate control for district heating system, a GPC (generalized predictive control) adaptive algorithm was presented that directly identified controller's parameters with two identifiers. The algorithm could adapt characteristics of district ... Keywords: adaptive, direct identification, district heating system, generalized predictive control

Zhao Youen

2009-06-01T23:59:59.000Z

82

Digital control and data acquisition for high-value GTA welding  

SciTech Connect

Electric power for the Cassini space probe wig be provided by radioisotope thermoelectric generators (RTGs) thermally driven by General-Purpose Heat Source (GPHS) modules. Each GPHS module contains four, 150-g, pellets of {sup 238}PuO{sub 2}, and each of the four pellets is encapsulated within a thin-wall iridium-alloy shell. GTA girth welding of these capsules is performed at Los Alamos National Laboratory (LANL) on an automated, digitally-controlled welding system. This paper discusses baseline design considerations for system automation and strategies employed to maximize process yield, improve process consistency, and generate required quality assurance information. Design of the automated girth welding system was driven by a number of factors which militated for precise parametric control and data acquisition. Foremost among these factors was the extraordinary value of the capsule components. In addition, DOE order 5700.6B, which took effect on 23 September 1986, required that all operations adhere to strict levels of process quality assurance. A detailed technical specification for the GPHS welding system was developed on the basis of a joint Lanl/Westinghouse Savannah River Company (WSRC) design effort. After a competitive bidding process, Jetline Engineering, Inc., of Irvine, California, was selected as the system manufacturer. During the period over which four identical welding systems were fabricated, very close liason was maintained between the LANL/WSRC technical representatives and the vendor. The level of rapport was outstanding, and the end result was the 1990 delivery of four systems that met or exceeded all specification requirements.

George, T.G. [Los Alamos National Lab., NM (United States); Franco-Ferreira, E.A. [Westinghouse Savannah River Co., Aiken, SC (United States)

1993-10-01T23:59:59.000Z

83

METHOD AND APPARATUS FOR CONTROLLING DIRECT-CYCLE NEUTRONIC REACTORS  

DOE Patents (OSTI)

A control arrangement is offered for a boiling-water reactor. Boric acid is maintained in the water in the reactor and the amount in the reactor is controlled by continuously removing a portion of the water from the reactor, concentrating the boric acid by evaporating the water therefrom, returning a controlled amount of the acid to the reactor, and simultaneously controlling the water level by varying the rate of spent steam return to the reactor.

Reed, G.A.

1961-01-10T23:59:59.000Z

84

Direct versus Facility Centric Load Control for Automated Demand Response  

E-Print Network (OSTI)

networks used in energy management systems to IP networkswith residential energy management systems and is beingequipment (e.g. energy management and control system - EMCS)

Piette, Mary Ann

2010-01-01T23:59:59.000Z

85

Surface control bent sub for directional drilling of petroleum wells  

DOE Patents (OSTI)

Directional drilling apparatus for incorporation in a drill string, wherein a lower apparatus section is angularly deviated from vertical by cam action and wherein rotational displacement of the angularly deviated apparatus section is overcome by additional cam action, the apparatus being operated by successive increases and decreases of internal drill string pressure.

Russell, Larry R. (6025 Edgemoor, Suite C, Houston, TX 77081)

1986-01-01T23:59:59.000Z

86

International Journal of Greenhouse Gas Control 5 (2011) 10551064 Contents lists available at ScienceDirect  

E-Print Network (OSTI)

International Journal of Greenhouse Gas Control 5 (2011) 1055­1064 Contents lists available at ScienceDirect International Journal of Greenhouse Gas Control journal homepage: www option in the portfolio of mitigation actions for stabilization of atmospheric greenhouse gas

Prevost, Jean-Herve

87

System Support for Name Authority Control Problem in Digital Libraries: OpenDBLP Approach  

E-Print Network (OSTI)

, The Pennsylvania State University dongwon@psu.edu Abstract. In maintaining Digital Libraries, having bibliographic documents for which various kinds of unique ID systems exist (e.g., DOI, ISBN), other bibliographic entities such bibliographic entities is not trivial. For instance, suppose a scholar changes her last name from A to B. Then

Lee, Dongwon

88

Quality Control and Archiving of Digital Data Gathered by the Bureau of Reclamation's Weather Radar  

Science Conference Proceedings (OSTI)

This paid describes the logic and process used to process high volumes of digital radar data recorded on magnetic tape to a compressed quality-checked archival format. The basic Philosophy in the processing is to retain all echo data that exceed ...

Gerard E. Klazura; Ra Aman

1989-12-01T23:59:59.000Z

89

Bi-directional power control system for voltage converter  

DOE Patents (OSTI)

A control system for a voltage converter includes: a power comparator for comparing a power signal on input terminals of the converter with a commanded power signal and producing a power comparison signal; a power regulator for transforming the power comparison signal to a commanded current signal; a current comparator for comparing the commanded current signal with a measured current signal on output terminals of the converter and producing a current comparison signal; a current regulator for transforming the current comparison signal to a pulse width modulator (PWM) duty cycle command signal; and a PWM for using the PWM duty cycle command signal to control electrical switches of the converter. The control system may further include: a command multiplier for converting a voltage signal across the output terminals of the converter to a gain signal having a value between zero (0) and unity (1), and a power multiplier for multiplying the commanded power signal by the gain signal to provide a limited commanded power signal, wherein power comparator compares the limited commanded power signal with the power signal on the input terminals.

Garrigan, Neil Richard (Niskayuna, NY); King, Robert Dean (Schenectady, NY); Schwartz, James Edward (Slingerlands, NY)

1999-01-01T23:59:59.000Z

90

Bi-directional power control system for voltage converter  

DOE Patents (OSTI)

A control system for a voltage converter includes: a power comparator for comparing a power signal on input terminals of the converter with a commanded power signal and producing a power comparison signal; a power regulator for transforming the power comparison signal to a commanded current signal; a current comparator for comparing the commanded current signal with a measured current signal on output terminals of the converter and producing a current comparison signal; a current regulator for transforming the current comparison signal to a pulse width modulator (PWM) duty cycle command signal; and a PWM for using the PWM duty cycle command signal to control electrical switches of the converter. The control system may further include: a command multiplier for converting a voltage signal across the output terminals of the converter to a gain signal having a value between zero (0) and unity (1), and a power multiplier for multiplying the commanded power signal by the gain signal to provide a limited commanded power signal, wherein power comparator compares the limited commanded power signal with the power signal on the input terminals. 10 figs.

Garrigan, N.R.; King, R.D.; Schwartz, J.E.

1999-05-11T23:59:59.000Z

91

SVPWM-Based Simulation of Direct Torque Control in Permanent Magnet Synchronous Motor  

Science Conference Proceedings (OSTI)

On the basis of analysis of the mathematical model of permanent magnet synchronous motor (PMSM), this paper is to propose a new type direct torque control system based on space vector pulse width modulation (SVPWM) technology aiming at big torque ripple, ... Keywords: permanent magnet synchronous motor, direct torque control, space vector pulse width modulation, MATLAB/Simulink

Huang Xianghui, Sun Nan

2013-10-01T23:59:59.000Z

92

Software standards, methods and quality control for the Sloan Digital Sky Survey  

SciTech Connect

The Sloan Digital Sky Survey (SDSS) Collaboration involves upwards of 50 scientists, many of whom are involved in the development and use of the software needed to acquire, process and archive the image and spectroscopic data sets. Fermilab has major responsibilities in the development and maintenance of the project`s software and for its software engineering practices. The authors report on the standards and methodologies they have developed in support of these activities.

Pordes, R.; Berman, E.; Petravick, D. [Fermi National Accelerator Lab., Batavia, IL (United States). Computing Div.] [and others

1995-10-01T23:59:59.000Z

93

Modeling of Digital Instrumentation and Control in Nuclear Power Plant Probabilistic Risk Assessments  

Science Conference Proceedings (OSTI)

Probabilistic risk assessment (PRA) typically models hardware components in terms of their failure probability and the effects that any given component failure has on the system it resides in. Digital systems, which include both hardware and software, bring new modeling challenges: determination of the appropriate level of detail to use in the logic models, and estimation of failure rates for software components. Failure probabilities for hardware are typically based on operating experience with componen...

2012-07-30T23:59:59.000Z

94

Digital Image Authentication: A Review  

Science Conference Proceedings (OSTI)

Digital image authentication refers to all the techniques performing anti-falsification, digital image copyright protection, or access control. A large number of DIA techniques have been developed to authenticate digital images, including cryptography-based ... Keywords: Data Hiding, Digital Fingerprints, Forensic Science, Image Authentication, Watermarking

Chia-Hung Wei; Yue Li

2011-04-01T23:59:59.000Z

95

Method of digital epitaxy by externally controlled closed-loop feedback  

DOE Patents (OSTI)

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

Eres, D.; Sharp, J.W.

1994-07-19T23:59:59.000Z

96

A direct approach to control-flow sensitive region-based memory management  

Science Conference Proceedings (OSTI)

Region-based memory management can be used to control dynamic memory allocations and deallocations safely and efficiently. Existing (direct-style) region systems that statically guarantee region safety---no dereferencing of dangling pointers---are based ...

Fritz Henglein; Henning Makholm; Henning Niss

2001-09-01T23:59:59.000Z

97

Human Factors Guidance for Control Room and Digital Human-System Interface Design and Modification: Guidelines for Planning, Specifi cation, Design, Licensing, Implementation, Training, Operation, and Maintenance  

Science Conference Proceedings (OSTI)

Operators of nuclear power plants face a significant challenge designing and modifying control rooms that will be produced at various stages of instrumentation and control modernization. This report provides guidance on planning, specifying, designing, implementing, operating, maintaining, and training for modernized control rooms and digital human-system interfaces. Much of the guidance also will support new plant control rooms. This report also presents detailed information and guidelines on specific t...

2004-11-29T23:59:59.000Z

98

Different methods for direct torque control of induction motor fed from current source inverter  

Science Conference Proceedings (OSTI)

Two different methods for direct torque control (DTC) of induction motor fed from current source inverter (CSI) is analyzed in the paper. The first one is derived from well-known DTC strategy developed for voltage inverter drives. This type of control ... Keywords: CSI, DTC, constant switching, hysteresis comparator, induction motor

Aleksandar Nikolic; Borislav Jeftenic

2008-07-01T23:59:59.000Z

99

Cyber Security Procurement—Application of the Methodology, Third Example: Digital Feedwater Control  

Science Conference Proceedings (OSTI)

Determining how to apply cyber security requirements to new instrumentation and control (I&C) systems requires cyber security experts, I&C engineers, and procurement organizations to work with vendors to implement and maintain cyber security controls. Improper or incomplete implementation of cyber security controls due to lack of proper requirements and/or unclear division of responsibilities between the utility and vendor can result in costly retrofits to meet the ...

2013-12-19T23:59:59.000Z

100

Real-time digital control of DFIG-based wind generators for grid support.  

E-Print Network (OSTI)

??In this thesis, a set of new converter /control techniques are developed for the Grid Side and Rotor Side converter applications in DFIG wind power… (more)

Mesbah, Mohsen

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "direct digital controls" 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 of a Digital Controller for a Vertical Wind Tunnel (VWT) Prototype to Mitigate Ball Fluctuations  

E-Print Network (OSTI)

The objective of this research was to mitigate fluctuations of a levitated ping pong ball within a vertical wind tunnel (VWT) prototype. This was made possible by remodeling the VWT system with its inherent nonlinear characteristics instead of assuming constant parameter relationships. By considering these nonlinearities a more accurate model was developed that better represented the actual system. The gain scheduling controller technique was chosen to control the ball’s vertical displacement within VWT prototype. After remodeling the VWT’s dynamics, the transfer function gain, for three different specified equilibrium points, were found to be within ±35% of the original system dynamics’ gain which explain why ball fluctuation was present. Also, three different controllers were developed to mitigate fluctuations at 0.10m, 0.15m and 0.20m. The three controllers were combined to create the gain scheduled controller; however, no testing has been done due to sudden, last minute hardware malfunction.

Silva, Ramon A.

2010-05-01T23:59:59.000Z

102

Digital PCR  

Science Conference Proceedings (OSTI)

*. Bookmark and Share. Digital PCR. Summary: Digital PCR (dPCR) is a method used to quantify nucleic acids (DNA, RNA, cDNA). ...

2013-04-26T23:59:59.000Z

103

Digital materials for digital fabrication  

E-Print Network (OSTI)

This thesis introduces digital materials by analogy with digital computation and digital communications. Traditional fabrication techniques include pick-and-place, roll-to-roll, molding, patterning and more. Current research ...

Popescu, George A

2007-01-01T23:59:59.000Z

104

Guideline on Configuration Management for Digital Instrumentation and Control Equipment and Systems  

Science Conference Proceedings (OSTI)

Configuration Management (CM) is an integrated management process that addresses the definition and documentation of design requirements, controls changes, and maintains the documentation of the as-built facility configuration throughout the entire life cycle for plant structures, systems, components, software, and hardware. CM methods that address all of these elements are well established for traditional hardware-based instrumentation and control (IC) systems. However, industry experience has indicated...

2011-11-08T23:59:59.000Z

105

Wide input range DC-DC converter with digital control scheme  

E-Print Network (OSTI)

In this thesis analysis and design of a wide input range DC-DC converter is proposed along with a robust power control scheme. The proposed converter and its control is designed to be compatible to a fuel cell power source, which exhibits 2:1 voltage variation as well as a slow transient response. The proposed approach consists of two stages: a primary three-level boost converter stage cascaded with a high frequency, isolated boost converter topology, which provides a higher voltage gain and isolation from the input source. The function of the first boost converter stage is to maintain a constant voltage at the input of the cascaded DC-DC converter to ensure optimal performance characteristics with high efficiency. At the output of the first boost converter a battery or ultracapacitor energy storage is connected to take care of the fuel cell slow transient response (200 watts/min). The robust features of the proposed control system ensure a constant output DC voltage for a variety of load fluctuations, thus limiting the power being delivered by the fuel cell during a load transient. Moreover, the proposed configuration simplifies the power control management and can interact with the fuel cell controller. The simulation results and the experimental results confirm the feasibility of the proposed system.

Harfman Todorovic, Maja

2004-12-01T23:59:59.000Z

106

Collective interaction by design collective controllers for social navigation on digital photos  

Science Conference Proceedings (OSTI)

This paper seeks to attract attention to the possibilities for designing for collaborative control and social negotiation in everyday interaction design. This work is starts out from the interaction model of collective interaction, which is a model depicting ... Keywords: collective interaction, interaction device, shared display, social interaction, tactile

Marianne Graves Petersen; Peter Gall Krogh; Morten Boye Mortensen; Thomas Møller-Lassen; Ditte Hvas Mortensen

2010-10-01T23:59:59.000Z

107

NEW OPTIMAL HIGH EFFICIENCY DSP-BASED DIGITAL CONTROLLER DESIGN FOR SUPER HIGH-SPEED PERMANENT  

E-Print Network (OSTI)

MAGNET SYNCHRONOUS MOTOR by LIMEI ZHAO A dissertation submitted in partial fulfillment magnet synchronous motors (PMSM). The PMSMs are a key component for the miniaturic cryocooler and the Florida Solar Energy Center. Advanced motor design methods, control strategies, and rapid progress

Wu, Shin-Tson

108

Direct Digital Manufacturing of Airfoils  

Science Conference Proceedings (OSTI)

This presentation will highlight progress made to date on development of LAMP technology. This work is sponsored by DARPA grant HR0011–08–1–0075.

109

The Open Digital Rights Language: XML for Digital Rights Management  

Science Conference Proceedings (OSTI)

Digital Rights Management (DRM) covers a broad area of intellectual property management and enforcement. DRM aims to provide secure and trusted services to control the use and distribution of content. DRM technologies have evolved from the primarily ... Keywords: Digital Rights Management (DRM), Open Digital Rights Language (ODRL), Open Mobile Alliance (OMA), Rights Expression Language, XML, XML Schema

Renato Iannella

2004-07-01T23:59:59.000Z

110

INCREASED FLEXIBILITY OF TURBO-COMPRESSORS IN NATURAL GAS TRANSMISSION THROUGH DIRECT SURGE CONTROL  

Science Conference Proceedings (OSTI)

The objective of this Direct Surge Control project was to develop a new internal method to avoid surge of pipeline compressors. This method will safely expand the range and flexibility of compressor operations, while minimizing wasteful recycle flow at the lower end of the operating envelope. The approach is to sense the onset of surge with a probe that directly measures re-circulation at the impeller inlet. The signals from the probe are used by a controller to allow operation at low flow conditions without resorting to a predictive method requiring excessive margin to activate a recycle valve. The sensor developed and demonstrated during this project was a simple, rugged, and sensitive drag probe. Experiments conducted in a laboratory compressor clearly showed the effectiveness of the technique. Subsequent field demonstrations indicated that the increase in range without the need to recycle flow was on the order of 19% to 25%. The cost benefit of applying the direct surge control technology appears to be as much as $120 per hour per compressor for operation without the current level of recycle flow. This could amount to approximately $85 million per year for the U.S. Natural Gas Transmission industry, if direct surge control systems are applied to most pipeline centrifugal compressors.

Robert J. McKee; Shane P. Siebenaler; Danny M. Deffenbaugh

2005-02-25T23:59:59.000Z

111

Direct Torque Control for Interior Permanent Magnet Synchronous Motors with Respect to Optimal Efficiency  

E-Print Network (OSTI)

Direct Torque Control for Interior Permanent Magnet Synchronous Motors with Respect to Optimal@lea.upb.de, boecker@lea.upb.de URL: http://wwwlea.upb.de Keywords «Interior permanent magnet synchronous motor to their high torque and power per volume ratio, interior permanent magnet synchronous motors (IPMSM

Noé, Reinhold

112

Application of Ant Colony Algorithm in PID Parameter Optimization for Mining Hoist Direct Torque Control System  

Science Conference Proceedings (OSTI)

The mining hoist is a key transport equipment to transfer the workers and coal between the mining well and the ground. In the traditional mining hoist direct torque control system, there are some disadvantages such as torque pulsation in the low speed ...

Xian-Min Ma

2009-01-01T23:59:59.000Z

113

Vibration Reduction Technology for Directional Blasting Demolition of 210m Chimney in Complex Environment  

Science Conference Proceedings (OSTI)

This paper describes the successful experience of the directional control blasting demolition of 210m reinforced concrete chimney, and elucidates the determination of the project scheme, parameter design, electronic digital detonator detonating network ... Keywords: reinforced concrete chimney, directional blasting, electronic digital detonator, blasting vibration, vibration reduction technology

Shunxiang Xu, Dezhi Chen

2013-01-01T23:59:59.000Z

114

NETL: IEP – Post-Combustion CO2 Emissions Control - Coal Direct Chemical  

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

- Oxy-Combustion CO2 Emissions Control - Oxy-Combustion CO2 Emissions Control Coal Direct Chemical Looping Retrofit for Pulverized Coal-Fired Power Plants with In-Situ CO2 Capture Project No.: DE-NT0005289 Ohio State chemical looping metal carrier. Ohio State chemical looping metal carrier. The Ohio State University Research Foundation will further develop coal direct chemical looping (CDCL) technology. CDCL uses a patented iron oxide-based composite oxygen carrier and can be retrofit to existing coal-fired power plants. The development of the CDCL system will be conducted through experimental testing under bench- and sub-pilot scales. Related Papers and Publications: Coal Direct Chemical Looping Retrofit to Pulverized Coal Power Plants for In-Situ CO2 Capture [PDF-2.43MB] (July 2013) Presented by Samuel Bayham of the Ohio State University Research Foundation at the 2013 NETL CO2 Capture Technology Meeting.

115

Direct torque control of permanent magnet synchronous motors with non-sinusoidal back-EMF  

E-Print Network (OSTI)

This work presents the direct torque control (DTC) techniques, implemented in four- and six-switch inverter, for brushless dc (BLDC) motors with non-sinusoidal back- EMF using two and three-phase conduction modes. First of all, the classical direct torque control of permanent magnet synchronous motor (PMSM) with sinusoidal back-EMF is discussed in detail. Secondly, the proposed two-phase conduction mode for DTC of BLDC motors is introduced in the constant torque region. In this control scheme, only two phases conduct at any instant of time using a six-switch inverter. By properly selecting the inverter voltage space vectors of the two-phase conduction mode from a simple look-up table the desired quasi-square wave current is obtained. Therefore, it is possible to achieve DTC of a BLDC motor drive with faster torque response while the stator flux linkage amplitude is deliberately kept almost constant by ignoring the flux control in the constant torque region. Third, the avarege current controlled boost power factor correction (PFC) method is applied to the previously discussed proposed DTC of BLDC motor drive in the constant torque region. The test results verify that the proposed PFC for DTC of BLDC motor drive improves the power factor from 0.77 to about 0.9997 irrespective of the load. Fourth, the DTC technique for BLDC motor using four-switch inverter in the constant torque region is studied. For effective torque control in two phase conduction mode, a novel switching pattern incorporating the voltage vector look-up table is designed and implemented for four-switch inverter to produce the desired torque characteristics. As a result, it is possible to achieve two-phase conduction DTC of a BLDC motor drive using four-switch inverter with faster torque response due to the fact that the voltage space vectors are directly controlled.. Finally, the position sensorless direct torque and indirect flux control (DTIFC) of BLDC motor with non-sinusoidal back-EMF has been extensively investigated using three-phase conduction scheme with six-switch inverter. In this work, a novel and simple approach to achieve a low-frequency torque ripple-free direct torque control with maximum efficiency based on dq reference frame similar to permanent magnet synchronous motor (PMSM) drives is presented.

Ozturk, Salih Baris

2008-05-01T23:59:59.000Z

116

The Effects of Degraded Digital Instrumentation and Control Systems on Human-system Interfaces and Operator Performance: HFE Review Guidance and Technical Basis  

SciTech Connect

New and advanced reactors will use integrated digital instrumentation and control (I&C) systems to support operators in their monitoring and control functions. Even though digital systems are typically highly reliable, their potential for degradation or failure could significantly affect operator performance and, consequently, impact plant safety. The U.S. Nuclear Regulatory Commission (NRC) supported this research project to investigate the effects of degraded I&C systems on human performance and plant operations. The objective was to develop human factors engineering (HFE) review guidance addressing the detection and management of degraded digital I&C conditions by plant operators. We reviewed pertinent standards and guidelines, empirical studies, and plant operating experience. In addition, we conducted an evaluation of the potential effects of selected failure modes of the digital feedwater system on human-system interfaces (HSIs) and operator performance. The results indicated that I&C degradations are prevalent in plants employing digital systems and the overall effects on plant behavior can be significant, such as causing a reactor trip or causing equipment to operate unexpectedly. I&C degradations can impact the HSIs used by operators to monitor and control the plant. For example, sensor degradations can make displays difficult to interpret and can sometimes mislead operators by making it appear that a process disturbance has occurred. We used the information obtained as the technical basis upon which to develop HFE review guidance. The guidance addresses the treatment of degraded I&C conditions as part of the design process and the HSI features and functions that support operators to monitor I&C performance and manage I&C degradations when they occur. In addition, we identified topics for future research.

O'Hara, J.M.; W. Gunther, G. Martinez-Guridi

2010-02-26T23:59:59.000Z

117

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

E-Print Network (OSTI)

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

Gorde, Harshal Wasudeo

1998-01-01T23:59:59.000Z

118

Digital Forensics  

Science Conference Proceedings (OSTI)

... Hany Farid Department of Computer Science Institute for Security ... the advent of digital cameras, powerful personal computers, and sophisticated ...

2010-10-05T23:59:59.000Z

119

INCREASED FLEXIBILITY OF TURBO-COMPRESSORS IN NATURAL GAS TRANSMISSION THROUGH DIRECT SURGE CONTROL  

Science Conference Proceedings (OSTI)

This preliminary phase 1 report summarizes the background and the work on the ''Increased Flexibility of Turbo-Compressors in Natural Gas Transmission through Direct Surge Control'' project to date. The importance of centrifugal compressors for natural gas transmission is discussed, and the causes of surge and the consequences of current surge control approaches are explained. Previous technology development, including findings from early GMRC research, previous surge detection work, and selected publications, are presented. The project is divided into three Phases to accomplish the project objectives of verifying near surge sensing, developing a prototype surge control system (sensor and controller), and testing/demonstrating the benefits of direct surge control. Specification for the direct surge control sensor and controller developed with guidance from the industry Oversight Committee is presented in detail. Results of CFD modeling conducted to aid in interpreting the laboratory test results are shown and explained. An analysis of the system dynamics identified the data sampling and handling requirements for direct surge control. A detailed design process for surge detection probes has been developed and explained in this report and has been used to prepare drag probes for the laboratory compressor test and the first field test. The surge detection probes prepared for testing have been bench tested and flow tested to determine and calibrate their sensitivity to flow forces as shown in data presented in this report. The surge detection drag probes have been shown to perform as expected and as required to detect approaching surge. Laboratory test results of surge detection in the SwRI centrifugal compressor demonstrated functionality of the surge detection probes and a change in the impeller inlet flow pattern prior to surge. Although the recirculation cannot be detected because of the specific geometry of this compressor, there are changes that indicate the approach of surge that can be detected. Preparations for a field test had been completed at one point in the project. However, a failure of the surge probe wiring just inside the compressor case has caused a delay in the field testing. Repairs for the wiring in the compressor have been scheduled and the field test will take place shortly after the repairs.

Robert J. McKee

2003-05-01T23:59:59.000Z

120

International Journal of Greenhouse Gas Control 14 (2013) 114 Contents lists available at SciVerse ScienceDirect  

E-Print Network (OSTI)

International Journal of Greenhouse Gas Control 14 (2013) 1­14 Contents lists available at SciVerse ScienceDirect International Journal of Greenhouse Gas Control journal homepage: www

Zhou, Quanlin

Note: This page contains sample records for the topic "direct digital controls" 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

Digital PCR  

Science Conference Proceedings (OSTI)

... Emulsion generator produces water-in-oil ... Number of PCR cycles Page 68. ... based on quote for 12.765 digital arrays 2012 &list price Sept 2012 ...

2013-04-16T23:59:59.000Z

122

Technical and economic assessment of particle control technology for direct coal fueled turbines: Final report  

SciTech Connect

Gilbert/Commomwealth (1984) analyzed ten different concepts for high-temperature, high-pressure control of gas stream particulate matter in coal-fueled pressurized fluidized-bed combustion (PFBC) systems. This paper analyzes the five higher ranking concepts of the Gilbert study at direct coal fueled turbine conditions which are even more severe than PFBC conditions. The five concepts are ceramic crossflow filter, ceramic bag filter, granular bed filter, and advanced cyclones. Five ranking factors were used: economic, design, operations complexity, materials/mechanical, and development status. (DLC)

DiBella, C.A.W.; Thomas, R.L.; Rubow, L.N.; Zaharchuk, R.

1987-02-01T23:59:59.000Z

123

Integrated control-path design and error recovery in the synthesis of digital microfluidic lab-on-chip  

Science Conference Proceedings (OSTI)

Recent advances in digital microfluidics have led to tremendous interest in miniaturized lab-on-chip devices for biochemical analysis. Synthesis tools have also emerged for the automated design of lab-on-chip from the specifications of laboratory protocols. ... Keywords: Error recovery, biochips, microfluidics, synthesis

Yang Zhao; Tao Xu; Krishnendu Chakrabarty

2010-08-01T23:59:59.000Z

124

A Low-Noise, Microprocessor-Controlled, Internally Digitizing Rotating-Vane Electric Field Mill for Airborne Platforms  

Science Conference Proceedings (OSTI)

This paper reports on a new generation of aircraft-based rotating-vane-style electric field mills designed and built at NASA’s Marshall Space Flight Center. The mills have individual microprocessors that digitize the electric field signal at the ...

M. G. Bateman; M. F. Stewart; S. J. Podgorny; H. J. Christian; D. M. Mach; R. J. Blakeslee; J. C. Bailey; D. Daskar

2007-07-01T23:59:59.000Z

125

Direct in Situ Determination of the Mechanisms Controlling Nanoparticle Nucleation and Growth  

SciTech Connect

Although nanocrystal morphology is controllable using conventional colloidal synthesis, multiple characterization techniques are typically needed to determine key properties like the nucleation rate, induction time, growth rate, and the resulting morphology. Recently, researchers have demonstrated growth of nanocrystals by in situ electron beam reduction, offering direct observations of single nanocrystals and eliminating the need for multiple characterization techniques; however, they found nanocrystal morphologies consistent with two different growth mechanisms for the same electron beam parameters. Here we show that the electron beam current plays a role analogous to the concentration of reducing agent in conventional synthesis, by controlling the growth mechanism and final morphology of silver nanocrystals grown via in situ electron beam reduction. We demonstrate that low beam currents encourage reaction limited growth that yield nanocrystals with faceted structures, while higher beam currents encourage diffusion limited growth that yield spherical nanocrystals. By isolating these two growth regimes, we demonstrate a new level of control over nanocrystal morphology, regulated by the fundamental growth mechanism. We find that the induction threshold dose for nucleation is independent of the beam current used for imaging, but is a function of the interaction volume size. Our results indicate that in situ electron microscopy data can be interpreted by classical models, by allowing simultaneous measurement of nucleation induction times, growth rates, and evolution of nanocrystal morphology. The results suggest that systematic dose experiments should be performed for all future in situ liquid studies to confirm the exact mechanisms underlying observations of nucleation and growth.

Woehl, Taylor J.; Evans, James E.; Arslan, Ilke; Ristenpart, William D.; Browning, Nigel D.

2012-10-23T23:59:59.000Z

126

Utility-Scale Power Router: Dynamic Control of Grid Assets Using Direct AC Converter Cells  

SciTech Connect

ADEPT Project: Georgia Tech is developing a cost-effective, utility-scale power router that uses an enhanced transformer to more efficiently direct power on the grid. Existing power routing technologies are too expensive for widespread use, but the ability to route grid power to match real-time demand and power outages would significantly reduce energy costs for utilities, municipalities, and consumers. Georgia Tech is adding a power converter to an existing grid transformer to better control power flows at about 1/10th the cost of existing power routing solutions. Transformers convert the high-voltage electricity that is transmitted through the grid into the low-voltage electricity that is used by homes and businesses. The added converter uses fewer steps to convert some types of power and eliminates unnecessary power storage, among other improvements. The enhanced transformer is more efficient, and it would still work even if the converter fails, ensuring grid reliability.

None

2010-09-01T23:59:59.000Z

127

Systems & Control Letters 60 (2011) 815824 Contents lists available at SciVerse ScienceDirect  

E-Print Network (OSTI)

], the octane rating control in the continuous catalytic reforming process [2], and the control of chemical

Pagilla, Prabhakar R.

128

Digital Windows: cause + effect between reality + virtuality.  

E-Print Network (OSTI)

??Digital Windows allow real people in the real world to interact with virtual objects in a virtual world through a direct relationship between real-space and… (more)

Sumsion, F

2007-01-01T23:59:59.000Z

129

Digital Strategy  

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

New expectations require the Federal Government to be ready to deliver and receive digital information and services anytime, anywhere and on any device. It must do so safely, securely, and with...

130

Digital diorama  

E-Print Network (OSTI)

Digital Diorama may be briefly presented as: a historical exploration of the vision devices, performances, and installations of the nineteenth century, and their influences on the project. These histories of the magic ...

Spikol, Daniel

1992-01-01T23:59:59.000Z

131

Optimal Control of Distillation Systems  

E-Print Network (OSTI)

The optimum performance of a distillation system can be evaluated by examining the product purities, the product recoveries, and the system's capability to respond to small or large, expected or unexpected, plant disturbances. An optimal control system should include accurate instrumentation, closed loop purity control, and a computer system to execute direct digital control with appropriate feed-forward algorithms.

Chatterjee, N.; Suchdeo, S. R.

1984-01-01T23:59:59.000Z

132

Image enhancement by digital computer  

Science Conference Proceedings (OSTI)

In the past 15 years digital computers have been used to greatly improve from images. In this paper we review and discuss a number of techniques for the enhancement of imagery by digital computer. The implications of this technology to verification of arms control treaties is left to the reader.

B. R. Hunt

1983-01-01T23:59:59.000Z

133

Digital Full-Scope Simulation of a Conventional Nuclear Power Plant Control Room, Phase 2: Installation of a Reconfigurable Simulator to Support Nuclear Plant Sustainability  

SciTech Connect

The U.S. Department of Energy’s Light Water Reactor Sustainability program has developed a control room simulator in support of control room modernization at nuclear power plants in the U.S. This report highlights the recent completion of this reconfigurable, full-scale, full-scope control room simulator buildout at the Idaho National Laboratory. The simulator is fully reconfigurable, meaning it supports multiple plant models developed by different simulator vendors. The simulator is full-scale, using glasstop virtual panels to display the analog control boards found at current plants. The present installation features 15 glasstop panels, uniquely achieving a complete control room representation. The simulator is also full-scope, meaning it uses the same plant models used for training simulators at actual plants. Unlike in the plant training simulators, the deployment on glasstop panels allows a high degree of customization of the panels, allowing the simulator to be used for research on the design of new digital control systems for control room modernization. This report includes separate sections discussing the glasstop panels, their layout to mimic control rooms at actual plants, technical details on creating a multi-plant and multi-vendor reconfigurable simulator, and current efforts to support control room modernization at U.S. utilities. The glasstop simulator provides an ideal testbed for prototyping and validating new control room concepts. Equally importantly, it is helping create a standardized and vetted human factors engineering process that can be used across the nuclear industry to ensure control room upgrades maintain and even improve current reliability and safety.

Ronald L. Boring; Vivek Agarwal; Kirk Fitzgerald; Jacques Hugo; Bruce Hallbert

2013-03-01T23:59:59.000Z

134

International Journal of Greenhouse Gas Control 9 (2012) 1023 Contents lists available at SciVerse ScienceDirect  

E-Print Network (OSTI)

International Journal of Greenhouse Gas Control 9 (2012) 10­23 Contents lists available at SciVerse ScienceDirect International Journal of Greenhouse Gas Control journal homepage: www and the climate system. The most significant greenhouse gas is CO2 which has increased from pre

135

International Journal of Greenhouse Gas Control 11 (2012) 172180 Contents lists available at SciVerse ScienceDirect  

E-Print Network (OSTI)

International Journal of Greenhouse Gas Control 11 (2012) 172­180 Contents lists available at SciVerse ScienceDirect International Journal of Greenhouse Gas Control journal homepage: www.elsevier.com/locate/ijggc Gas­solid carbonation of Ca(OH)2 and CaO particles under non-isothermal and isothermal conditions

Montes-Hernandez, German

136

Goal-directed planning and plan recognition for the sustainable control of homes  

E-Print Network (OSTI)

The goal of this thesis is to design an autonomous control system for the sustainable control of buildings. The control system focusses on satisfying three goals to encourage and facilitate a more sustainable lifestyle for ...

Graybill, Wesley (Wesley Darwin)

2012-01-01T23:59:59.000Z

137

Control strategy for hydrocarbon emissions in turbocharged direct injection spark ignition engines during cold-start  

E-Print Network (OSTI)

Gasoline consumption and pollutant emissions from transportation are costly and have serious, demonstrated environmental and health impacts. Downsized, turbocharged direct-injection spark ignition (DISI) gasoline engines ...

Cedrone, Kevin David

2013-01-01T23:59:59.000Z

138

IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 24, NO. 11, NOVEMBER 2009 2625 Hybrid Digital Adaptive Control for Fast Transient  

E-Print Network (OSTI)

-state operating point and a bank of switching surface controllers (SSCs) away from the reference. The switching.babazadeh@infineon.com). D. Maksimovi´c is with the Department of Electrical, Computer, and Energy Engineering, University

139

Direct Nyquist array design of PID controllers for boiler-turbine units based on gain and phase margins  

Science Conference Proceedings (OSTI)

In this paper, a direct Nyquist array (DNA) method for the design of PID controllers for multivariable boiler-turbine units with specifications of gain and phase margins is proposed. The essential objective is to propose a method for the design and auto-tuning ...

Hui Pan; Minrui Fei; Ling Wang; Kang Li; Lin Qian

2012-03-01T23:59:59.000Z

140

Direct Torque Control Based on Space Vector Modulation with Adaptive Neural Integrator for Stator Flux Estimation in Induction Motors  

Science Conference Proceedings (OSTI)

Direct torque control based on space vector modulation (SVM-DTC) preserve DTC transient merits, furthermore, produce better quality steady-state performance in a wide speed range. A new adaptive neural integration algorithm for estimating stator flux ... Keywords: DTC, space vector modulation, adaptive neural integrator, stator flux estimation

Chunhua Zang; Xianqing Cao

2009-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "direct digital controls" 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

Transmission and Distribution Benefits of Direct Load Control: Seattle City Light and Snohomish Public Utility District Pilot Project Evaluations  

Science Conference Proceedings (OSTI)

Two residential direct load control programs in the Puget Sound region have reduced peak loads at both the system as well as the local transmission and distribution levels. This report presents program load impact results estimated using metered and disaggregated end-use load data. Included is a detailed description of participants' attitudes toward the programs and their experiences with program implementation.

1994-05-21T23:59:59.000Z

142

Crossing the Digital Divide  

SciTech Connect

Nuclear utilities continue to upgrade aging instrumentation and control (I&C) systems with modern digital-based systems to address reliability and obsolescence concerns. In addition, the industry has demonstrated that these systems can be successfully developed and deployed even for highly safety-significant applications, such as reactor protection. However, three factors have retarded wide-scale implementation of digital technology for plant modernization and business innovation: *Large-scale digital upgrades entail considerable risk; *The upgrades are very costly and have not led to bottom-line business improvement, financial or otherwise; *Cyber Security concerns discourage wide-scale digital integration. A new national research program is under way that has been designed to address these industry concerns about expanding the use of digital technology. The Idaho National Laboratory (INL) has lead responsibility for the Advanced Instrumentation, Information, and Control Systems Technologies research pathway within the Light Water Reactor Sustainability (LWRS) Program. The LWRS Program is a research and development (R&D) program sponsored by the U.S. Department of Energy (DOE) and performed in close collaboration with industry R&D and improvement programs (as defined in INL’s FY2009–2013 Light Water Reactor Sustainability Research and Development Program Plan, INL/MIS08-14918). Its purpose is to provide the technical foundations for licensing and managing the long-term, safe, and economical operation of existing nuclear power plants. The DOE’s program focus is on longer-term and higher-risk/reward research that contributes to the national policy objectives of energy security and environmental security. The specific concern addressed by this program is that large-scale I&C obsolescence could become a life-limiting issue for the current nuclear operating fleet.

Ken Thomas

2011-11-01T23:59:59.000Z

143

Subsystem of Data Acquisition Using the ModBus Protocol in Real Time of the Digital Electro-Hydraulic Control and Its Integration with the Integral System of Process Information of Laguna Verde Nuclear Power Plant  

Science Conference Proceedings (OSTI)

In this article, the achieved development is presented of a software module of data acquisition in real time using the ModBus protocol named Subsystem of Data Acquisition of the Digital Electro-Hydraulic Control and its integration with the New Data ... Keywords: Real time, Data acquisition System, Nuclear power plant, Modbus protocol, Linux, C++, TCP/IP

Efren Ruben Coronel Flores, Carlos Chairez Campos

2012-11-01T23:59:59.000Z

144

Method for exciting inductive-resistive loads with high and controllable direct current  

DOE Patents (OSTI)

Apparatus and method for transmitting dc power to a load circuit by applying a dc voltage from a standard waveform synthesizer to duration modulate a bipolar rectangular wave generator. As the amplitude of the dc voltage increases, the widths of the rectangular wave generator output pulses increase, and as the amplitude of the dc voltage decreases, the widths of the rectangular wave generator output pulses decrease. Thus, the waveform synthesizer selectively changes the durations of the rectangular wave generator bipolar output pulses so as to produce a rectangular wave ac carrier that is duration modulated in accordance with and in direct proportion to the voltage amplitude from the synthesizer. Thereupon, by transferring the carrier to the load circuit through an amplifier and a rectifier, the load current also corresponds directly to the voltage amplitude from the synthesizer. To this end, the rectified wave at less than 100% duty factor, amounts to a doubled frequency direct voltage pulse train for applying a direct current to the load, while the current ripple is minimized by a high L/R in the load circuit. In one embodiment, a power transmitting power amplifier means having a dc power supply is matched to the load circuit through a transformer for current magnification without sacrificing load current duration capability, while negative voltage and current feedback are provided in order to insure good output fidelity.

Hill, Jr., Homer M. (Princeton Junction, NJ)

1976-01-01T23:59:59.000Z

145

Testing of an Emitter Turn-Off-Based Static Synchronous Compensator (STATCOM) Controller with Real-Time Digital Simulation  

Science Conference Proceedings (OSTI)

In this report, the testing of a controller for a 10-MVAR emitter turn-off (ETO) static VAR compensator (STATCOM) through hardware-in-the-loop simulation is described. As the STATCOM was initially intended to be placed near a 50-MW wind farm within the Bonneville Power Administration (BPA) system, the wind farm, STATCOM, and relevant portions of the utility system were modeled for a real-time simulator at the Center for Advanced Power Systems (CAPS) at Florida State University. Data for validation of the...

2010-01-20T23:59:59.000Z

146

Characterization of a 16-Bit Digitizer for Lidar Data Acquisition  

E-Print Network (OSTI)

A 6-MHz 16-bit waveform digitizer was evaluated for use in atmospheric differential absorption lidar (DIAL) measurements of ozone. The digitizer noise characteristics were evaluated, and actual ozone DIAL atmospheric returns were digitized. This digitizer could replace computer-automated measurement and control (CAMAC)-based commercial digitizers and improve voltage accuracy. Introduction The waveform digitizer is a critical component of lidar detection systems; it transforms the analog detector output into a digital signal by measuring the signal voltage in a discrete time interval determined by an external clock. The accuracy of the digital voltage level increases with the digitizer bit level. Technology has advanced to the point where 8- and 12-bit waveform digitizers are commercially available and commonly used in computer-automated measurement and control (CAMAC) crates, which are readily interfaced to computer systems. These systems have worked well for ground and aircraft-borne...

Cynthia Williamson And; Cynthia K. Williamson; Russell J. De Young

2000-01-01T23:59:59.000Z

147

Method for controlling directional drilling in response to horns detected by electromagnetic energy propagation resistivity measurements  

Science Conference Proceedings (OSTI)

For use in conjunction with an earth borehole drilling apparatus that includes: a drilling rig; a drill string operating from said drilling rig for drilling an earth borehole, said drill string including a bottom hole arrangement comprising a drill bit, a downhole resistivity measuring subsystem for measuring downhole formation resistivity near said bit by propagating electromagnetic energy into earth formations near said bit, receiving electromagnetic energy that has propagated through the formations and producing measurement signals that depend on the received signals; a method is described for directing the drilling of a well bore with respect to a geological bed boundary in said earth formations, comprising the steps of: producing from said measurement signals a recording of downhole formation resistivity as a function of borehole depth, determining the presence of a horn in said resistivity recording; and implementing a change in the drilling direction of said drill bit in response to said determination of the presence of a horn.

Luling, M.

1993-08-31T23:59:59.000Z

148

Digital video display systems and dynamic graphics  

Science Conference Proceedings (OSTI)

Most digital video display systems have been capable of producing only text or static imagery. This paper shows that these limitations are not intrinsic to the technology, but are rather a direct consequence of the display system architecture. The paper ... Keywords: Animated graphics, Computer animation, Digital video display, Dynamic graphics, Raster display, Raster graphics, Video display, Video raster system

Ronald Baecker

1979-08-01T23:59:59.000Z

149

Directly induced swing for closed loop control of electroslag remelting furnace  

DOE Patents (OSTI)

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

Damkroger, B.

1998-04-07T23:59:59.000Z

150

PICOntrol: using a handheld projector for direct control of physical devices through visible light  

Science Conference Proceedings (OSTI)

Today's environments are populated with a growing number of electric devices which come in diverse form factors and provide a plethora of functions. However, rich interaction with these devices can become challenging if they need be controlled from a ... Keywords: handheld projector, physical devices, visible light communication

Dominik Schmidt; David Molyneaux; Xiang Cao

2012-10-01T23:59:59.000Z

151

Controlling combustion characteristics using a slit nozzle in a direct-injection methanol engine  

SciTech Connect

A new type of fuel injection nozzle, called a `slit nozzle,` has been developed to improve poor ignitability and to stabilize combustion under low load conditions in direct-injection methanol diesel engines manufactured for medium-duty trucks. This nozzle has a single oblong vent like a slit. Engine test results indicate that the slit nozzle can improve combustion and thermal efficiency, especially at low loads and no load. This can be explained by the fact that the slit nozzle forms a more highly concentrated methanol spray around the glow-plug than do multi-hole nozzles. As a result, this nozzle improves flame propagation. 3 refs., 12 figs., 4 tabs.

Kusaka, Jin; Daisho, Yasuhiro; Saito, Takeshi; Kihara, Ryoji

1994-10-01T23:59:59.000Z

152

The dynamics of individual nucleosomes controls the chromatin condensation pathway: direct AFM visualization of variant chromatin  

E-Print Network (OSTI)

Chromatin organization and dynamics is studied in this work at scales ranging from single nucleosome to nucleosomal array by using a unique combination of biochemical assays, single molecule imaging technique and numerical modeling. We demonstrate that a subtle modification in the nucleosome structure induced by the histone variant H2A.Bbd drastically modifies the higher order organization of the nucleosomal arrays. Importantly, as directly visualized by AFM, conventional H2A nucleosomal arrays exhibit specific local organization, in contrast to H2A.Bbd arrays, which show ?beads on a string? structure. The combination of systematic image analysis and theoretical modeling allows a quantitative description relating the observed gross structural changes of the arrays to their local organization. Our results strongly suggest that higher-order organization of H1-free nucleosomal arrays is mainly determined by the fluctuation properties of individual nucleosomes. Moreover, numerical simulations suggest the existenc...

Montel, Fabien; Castelnovo, Martin; Bednar, Jan; Dimitrov, Stefan; Angelov, Dimitar; Faivre-Moskalenko, Cendrine

2009-01-01T23:59:59.000Z

153

The dynamics of individual nucleosomes controls the chromatin condensation pathway: direct AFM visualization of variant chromatin  

E-Print Network (OSTI)

Chromatin organization and dynamics is studied in this work at scales ranging from single nucleosome to nucleosomal array by using a unique combination of biochemical assays, single molecule imaging technique and numerical modeling. We demonstrate that a subtle modification in the nucleosome structure induced by the histone variant H2A.Bbd drastically modifies the higher order organization of the nucleosomal arrays. Importantly, as directly visualized by AFM, conventional H2A nucleosomal arrays exhibit specific local organization, in contrast to H2A.Bbd arrays, which show ?beads on a string? structure. The combination of systematic image analysis and theoretical modeling allows a quantitative description relating the observed gross structural changes of the arrays to their local organization. Our results strongly suggest that higher-order organization of H1-free nucleosomal arrays is mainly determined by the fluctuation properties of individual nucleosomes. Moreover, numerical simulations suggest the existence of attractive interactions between nucleosomes to provide the degree of compaction observed for conventional chromatin fibers.

Fabien Montel; Hervé Menoni; Martin Castelnovo; Jan Bednar; Stefan Dimitrov; Dimitar Angelov; Cendrine Faivre-Moskalenko

2009-04-29T23:59:59.000Z

154

Controlled metal-semiconductor sintering/alloying by one-directional reverse illumination  

DOE Patents (OSTI)

Metal strips deposited on a top surface of a semiconductor substrate are sintered at one temperature simultaneously with alloying a metal layer on the bottom surface at a second, higher temperature. This simultaneous sintering of metal strips and alloying a metal layer on opposite surfaces of the substrate at different temperatures is accomplished by directing infrared radiation through the top surface to the interface of the bottom surface with the metal layer where the radiation is absorbed to create a primary hot zone with a temperature high enough to melt and alloy the metal layer with the bottom surface of the substrate. Secondary heat effects, including heat conducted through the substrate from the primary hot zone and heat created by infrared radiation reflected from the metal layer to the metal strips, as well as heat created from some primary absorption by the metal strips combine to create secondary hot zones at the interfaces of the metal strips with the top surface of the substrate. These secondary hot zones are not as hot as the primary hot zone, but they are hot enough to sinter the metal strips to the substrate.

Sopori, B.L.

1991-03-19T23:59:59.000Z

155

The Design of A Digital IC for Thyristor Triggering  

Science Conference Proceedings (OSTI)

This paper presents the functional description and the design of a fully digital integrated circuit for thyristor firing control in a 1 /spl mu/m CMOS technology. The architecture is based on the equidistant firing method, which allows the change of ... Keywords: CMOS digital integrated circuits, digital IC, thyristor triggering, digital integrated circuit, thyristor firing control, CMOS technology, equidistant firing method, DTC06 IC, 1 micron

T. C. Pimenta; L. L. G. Vermaas; P. C. Crepaldi; R. L. Moreno

1997-01-01T23:59:59.000Z

156

The digital laser  

E-Print Network (OSTI)

It is well-known how to control the spatial output from a laser, with most solutions to date involving customised intra-cavity elements in the form of apertures, diffractive optics and free-form mirrors. These optical elements require considerable design and fabrication effort and suffer from the further disadvantage of being immutably connected to the selection of a particular spatial mode. Consequently, most laser systems are designed for the ubiquitous Gaussian mode, whereas it is clear that there are many instances when a customised mode would be preferable. We overcome these limitations with the first digital laser, comprising an electrically addressed reflective phase-only spatial light modulator as an intra-cavity holographic mirror. The phase and amplitude of the holographic mirror may be controlled as simply as writing a new gray-scale image (computer generated hologram) to the device: on-demand laser modes. We show that we can digitally control the laser modes with ease, albeit with higher round-tri...

Ngcobo, Sandile; Burger, Liesl; Forbes, Andrew

2013-01-01T23:59:59.000Z

157

Preserving digital information forever  

Science Conference Proceedings (OSTI)

Well within our lifetime we can expect to see most information being created, stored and used digitally. Despite the growing importance of digital data, the wider community pays almost no attention to the problems of preserving this digital information ... Keywords: archiving, digital preservation

Andrew Waugh; Ross Wilkinson; Brendan Hills; Jon Dell'oro

2000-06-01T23:59:59.000Z

158

Universal digital quantum simulation with trapped ions  

E-Print Network (OSTI)

A digital quantum simulator is an envisioned quantum device that can be pro- grammed to efficiently simulate any other local system. We demonstrate and investigate the digital approach to quantum simulation in a system of trapped ions. Using sequences of up to 100 gates and 6 qubits, the full time dynamics of a range of spin systems are digitally simulated. Interactions beyond those naturally present in our simulator are accurately reproduced and quantitative bounds are provided for the overall simulation quality. Our results demon- strate the key principles of digital quantum simulation and provide evidence that the level of control required for a full-scale device is within reach.

B. P. Lanyon; C. Hempel; D. Nigg; M. Müller; R. Gerritsma; F. Zähringer; P. Schindler; J. T. Barreiro; M. Rambach; G. Kirchmair; M. Hennrich; P. Zoller; R. Blatt; C. F. Roos

2011-09-07T23:59:59.000Z

159

Digital Identities | Department of Energy  

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

Digital Identities Digital Identities Public Key Infrastructure (PKI) is a comprehensive system that provides public-key encryption and digital signature services across a wide...

160

Deemed Savings Estimates for Legacy Air Conditioning and WaterHeating Direct Load Control Programs in PJM Region  

SciTech Connect

During 2005 and 2006, the PJM Interconnection (PJM) Load Analysis Subcommittee (LAS) examined ways to reduce the costs and improve the effectiveness of its existing measurement and verification (M&V) protocols for Direct Load Control (DLC) programs. The current M&V protocol requires that a PURPA-compliant Load Research study be conducted every five years for each Load-Serving Entity (LSE). The current M&V protocol is expensive to implement and administer particularly for mature load control programs, some of which are marginally cost-effective. There was growing evidence that some LSEs were mothballing or dropping their DLC programs in lieu of incurring the expense associated with the M&V. This project had several objectives: (1) examine the potential for developing deemed savings estimates acceptable to PJM for legacy air conditioning and water heating DLC programs, and (2) explore the development of a collaborative, regional, consensus-based approach for conducting monitoring and verification of load reductions for emerging load management technologies for customers that do not have interval metering capability.

Goldman, Charles

2007-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "direct digital controls" 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

Transient Melt Pool Response in Wire Feed Electron Beam Direct ...  

Science Conference Proceedings (OSTI)

Presentation Title, Transient Melt Pool Response in Wire Feed Electron Beam Direct ... Abstract Scope, Wire feed electron beam direct digital manufacturing ...

162

High speed flux feedback for tuning a universal field oriented controller capable of operating in direct and indirect field orientation modes  

SciTech Connect

The direct (d) and quadrature (q) components of flux, as sensed by flux sensors or determined from voltage and current measurements in a direct field orientation scheme, are processed rapidly and accurately to provide flux amplitude and angular position values for use by the vector rotator of a universal field-oriented (UFO) controller. Flux amplitude (linear or squared) is provided as feedback to tune the UFO controller for operation in direct and indirect field orientation modes and enables smooth transitions from one mode to the other.

De Doncker, Rik W. A. A. (Schenectady, NY)

1992-01-01T23:59:59.000Z

163

High speed flux feedback for tuning a universal field oriented controller capable of operating in direct and indirect field orientation modes  

SciTech Connect

The direct (d) and quadrature (q) components of flux, as sensed by flux sensors or determined from voltage and current measurements in a direct field orientation scheme, are processed rapidly and accurately to provide flux amplitude and angular position values for use by the vector rotator of a universal field-oriented (UFO) controller. Flux amplitude (linear or squared) is provided as feedback to tune the UFO controller for operation in direct and indirect field orientation modes and enables smooth transitions from one mode to the other. 3 figs.

De Doncker, R.W.A.A.

1992-09-01T23:59:59.000Z

164

Panel on digital preservation  

Science Conference Proceedings (OSTI)

Digital information in any form is at risk. Software and hardware become obsolete, and versions and file formats change, making data inaccessible. Data stored in even the simplest form are in danger due to computer media degradation and obsolescence. ... Keywords: archival systems, digital libraries, digital preservation, metadata

Joyce Ray; Robin Dale; Reagan Moore; Vicky Reich; William Underwood; Alexa T. McCray

2002-07-01T23:59:59.000Z

165

NIST Forensic Science -- Digital Evidence  

Science Conference Proceedings (OSTI)

... Sign up to receive news about NIST Forensic Science. *Email Address. ... NIST Forensic Science -- Digital Evidence. Digital ...

2013-09-13T23:59:59.000Z

166

Modelling, simulation and analysis of low-cost direct torque control of PMSM using hall-effect sensors  

E-Print Network (OSTI)

This thesis focuses on the development of a novel Direct Torque Control (DTC) scheme for permanent magnet (PM) synchronous motors (surface and interior types) in the constant torque region with the help of cost-effective hall-effect sensors. This method requires no DC-link sensing, which is a mandatory matter in the conventional DTC drives, therefore it reduces the cost of a conventional DTC of a permanent magnet (PM) synchronous motor and also removes common problems including; resistance change effect, low speed and integration drift. Conventional DTC drives require at least one DC-link voltage sensor (or two on the motor terminals) and two current sensors because of the necessary estimation of position, speed, torque, and stator flux in the stationary reference frame. Unlike the conventional DTC drive, the proposed method uses the rotor reference frame because the rotor position is provided by the three hall-effect sensors and does not require expensive voltage sensors. Moreover, the proposed algorithm takes the acceleration and deceleration of the motor and torque disturbances into account to improve the speed and torque responses. The basic theory of operation for the proposed topology is presented. A mathematical model for the proposed DTC of the PMSM topology is developed. A simulation program written in MATLAB/SIMULINK�® is used to verify the basic operation (performance) of the proposed topology. The mathematical model is capable of simulating the steady-state, as well as dynamic response even under heavy load conditions (e.g. transient load torque at ramp up). It is believed that the proposed system offers a reliable and low-cost solution for the emerging market of DTC for PMSM drives. Finally the proposed drive, considering the constant torque region operation, is applied to the agitation part of a laundry washing machine (operating in constant torque region) for speed performance comparison with the current low-cost agitation cycle speed control technique used by washing machine companies around the world.

Ozturk, Salih Baris

2005-12-01T23:59:59.000Z

167

Requirements Engineering for Digital Upgrades: Specification, Analysis, and Tracking  

Science Conference Proceedings (OSTI)

As nuclear power plants upgrade their instrumentation and control (I&C) systems with digital equipment to continue meeting safety and reliability requirements while controlling operating costs, the transition to the new technology has brought new challenges in properly specifying and confirming the correct performance of digital systems and devices. This guideline describes an approach that utilities can use to refine and improve their processes for developing and verifying requirements for digital upgra...

1997-12-09T23:59:59.000Z

168

Delta-Sigma digital-RF modulation for high data rate transmitters  

E-Print Network (OSTI)

A low power, wideband wireless transmitter utilizing [Delta]-[Sigma] direct digital modulation of an RF carrier is presented. The transmitter architecture replaces high dynamic range analog circuits with high speed digital ...

Jerng, Albert

2007-01-01T23:59:59.000Z

169

Digital Jordan curve theorems  

E-Print Network (OSTI)

Abstract. Efim Khalimsky’s digital Jordan curve theorem states that the complement of a Jordan curve in the digital plane equipped with the Khalimsky topology has exactly two connectivity components. We present a new, short proof of this theorem using induction on the Euclidean length of the curve. We also prove that the theorem holds with another topology on the digital plane but then only for a restricted class of Jordan curves. 1

Christer O. Kiselman

2000-01-01T23:59:59.000Z

170

Digitization Best Practices  

SciTech Connect

This project involved performing tests and documenting results to determine best practices for digitizing older print documents. The digitization process is complicated, especially when original documents exhibit non-standard fonts and are faded. Tests focused on solutions to improve high quality scanning, increase OCR accuracy, and efficiently use embedded metadata. Results are summarized. From the test results on the right sides, we know that when we plan to digitize documents, we should balance Quantity and Quality based on our expectation, and then make final decision for the digitization process.

Xue, Fei [Los Alamos National Laboratory; Holtkamp, Irma S. [Los Alamos National Laboratory; Knudson, Frances L. [Los Alamos National Laboratory

2012-07-31T23:59:59.000Z

171

Digital Media Quality  

Science Conference Proceedings (OSTI)

... video. This work was reported to the 2004 SPIE Conference on Applications of Digital Image Processing XXVII. SubjectiveAssessMethodsForMPEG ...

2010-10-05T23:59:59.000Z

172

Digital cultural collections in an age of reuse and remixes  

Science Conference Proceedings (OSTI)

This paper reports the results of a survey of U.S. cultural institution (CI) professionals about whether CI should seek to control access to and use of digital cultural collections. It describes motivations that encourage institutions to control access ... Keywords: archives, copyright, digital collections, licensing, museums, open access, privacy

Kristin R. Eschenfelder; Michelle Caswell

2010-10-01T23:59:59.000Z

173

Digital electronic bone growth stimulator  

DOE Patents (OSTI)

A device is described for stimulating bone tissue by applying a low level alternating current signal directly to the patient`s skin. A crystal oscillator, a binary divider chain and digital logic gates are used to generate the desired waveforms that reproduce the natural electrical characteristics found in bone tissue needed for stimulating bone growth and treating osteoporosis. The device, powered by a battery, contains a switch allowing selection of the correct waveform for bone growth stimulation or osteoporosis treatment so that, when attached to the skin of the patient using standard skin contact electrodes, the correct signal is communicated to the underlying bone structures. 5 figs.

Kronberg, J.W.

1995-05-09T23:59:59.000Z

174

Digital electronic bone growth stimulator  

DOE Patents (OSTI)

A device for stimulating bone tissue by applying a low level alternating current signal directly to the patient's skin. A crystal oscillator, a binary divider chain and digital logic gates are used to generate the desired waveforms that reproduce the natural electrical characteristics found in bone tissue needed for stimulating bone growth and treating osteoporosis. The device, powered by a battery, contains a switch allowing selection of the correct waveform for bone growth stimulation or osteoporosis treatment so that, when attached to the skin of the patient using standard skin contact electrodes, the correct signal is communicated to the underlying bone structures.

Kronberg, James W. (Aiken, SC)

1995-01-01T23:59:59.000Z

175

Parallel digital forensics infrastructure.  

Science Conference Proceedings (OSTI)

This report documents the architecture and implementation of a Parallel Digital Forensics infrastructure. This infrastructure is necessary for supporting the design, implementation, and testing of new classes of parallel digital forensics tools. Digital Forensics has become extremely difficult with data sets of one terabyte and larger. The only way to overcome the processing time of these large sets is to identify and develop new parallel algorithms for performing the analysis. To support algorithm research, a flexible base infrastructure is required. A candidate architecture for this base infrastructure was designed, instantiated, and tested by this project, in collaboration with New Mexico Tech. Previous infrastructures were not designed and built specifically for the development and testing of parallel algorithms. With the size of forensics data sets only expected to increase significantly, this type of infrastructure support is necessary for continued research in parallel digital forensics. This report documents the implementation of the parallel digital forensics (PDF) infrastructure architecture and implementation.

Liebrock, Lorie M. (New Mexico Tech, Socorro, NM); Duggan, David Patrick

2009-10-01T23:59:59.000Z

176

Data visualisation in digital forensics.  

E-Print Network (OSTI)

??As digital crimes have risen, so has the need for digital forensics. Numerous state-of-the-art tools have been developed to assist digital investigators conduct proper investigations… (more)

Fei, Bennie Kar Leung

2007-01-01T23:59:59.000Z

177

Towards hiding federated digital identity: stop-dissemination mechanism in content-centric networking  

Science Conference Proceedings (OSTI)

Evolving from a document-centered into a service and data-centered World Wide Web, Web of data, requires a better user's digital identity protection and management. The permanence nature of digital identity entails loss of user's control over distributed ... Keywords: content-centric networking, federated digital identity, identity hiding mechanism., user's identity control

Amine Elabidi; Ghazi Ben Ayed; Sonia Mettali Gammar; Farouk Kamoun

2011-11-01T23:59:59.000Z

178

Digital radiographic systems detect boiler tube cracks  

SciTech Connect

Boiler water wall leaks have been a major cause of steam plant forced outages. But conventional nondestructive evaluation techniques have a poor track record of detecting corrosion fatigue cracking on the inside surface of the cold side of waterwall tubing. EPRI is performing field trials of a prototype direct-digital radiographic system that promises to be a game changer. 8 figs.

Walker, S. [EPRI, Charlotte, NC (United States)

2008-06-15T23:59:59.000Z

179

Making digital leaf collages with blow painting!  

Science Conference Proceedings (OSTI)

We present a novel play interface called Blow Painting that enables people to create leaf collage paintings on a digital canvas by blowing at a toy windmill. The toy windmill detects the blowing action and direction with its embedded microphone and rotation ... Keywords: blowing, collage, daily experience, embodiment, interaction, leaf stencils, painting, play, rfid, tangible object

Yang-Ting Shen; Ellen Yi-Luen Do

2010-01-01T23:59:59.000Z

180

Handbook for Evaluating Critical Digital Equipment and Systems  

Science Conference Proceedings (OSTI)

Power plants are increasingly upgrading their instrumentation and control (IC) systems, replacing aging and obsolete analog equipment with software-based digital systems. For applications that are critical to safety or plant operability, utilities need to have high confidence that these new digital systems are sufficiently dependable that they will not degrade safety or plant reliability. This handbook suggests and describes in detail a critical digital review (CDR) technique that examines the design of ...

2005-11-28T23:59:59.000Z

Note: This page contains sample records for the topic "direct digital controls" 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

The FreeD - A Handheld Digital Milling Device for Craft and Fabrication  

E-Print Network (OSTI)

We present an approach to combine digital fabrication and craft that is focused on a new fabrication experience. The FreeD is a hand-held, digitally controlled, milling device. It is guided and monitored by a computer while ...

Paradiso, Joseph

182

Preserving digital media: towards a preservation solution evaluation metric  

Science Conference Proceedings (OSTI)

With an increasing amount of information being digitized or directly created and subsequently existing only electronically, and coupled with an ever increasing variety of file formats and integrated document functionalities, long-term preservation solutions ...

Carl Rauch; Andreas Rauber

2004-12-01T23:59:59.000Z

183

Fast transient digitizer  

DOE Patents (OSTI)

Method and apparatus for sequentially scanning a plurality of target elements with an electron scanning beam modulated in accordance with variations in a high-frequency analog signal to provide discrete analog signal samples representative of successive portions of the analog signal; coupling the discrete analog signal samples from each of the target elements to a different one of a plurality of high speed storage devices; converting the discrete analog signal samples to equivalent digital signals; and storing the digital signals in a digital memory unit for subsequent measurement or display.

Villa, Francesco (Palo Alto, CA)

1982-01-01T23:59:59.000Z

184

Digital sonar system  

DOE Patents (OSTI)

A transponder of an active digital sonar system identifies a multifrequency underwater activating sonar signal received from a remote sonar transmitter. The transponder includes a transducer that receives acoustic waves, including the activating sonar signal, and generates an analog electrical receipt signal. The analog electrical receipt signal is converted to a digital receipt signal and cross-correlated with a digital transmission signal pattern corresponding to the activating sonar signal. A relative peak in the cross-correlation value is indicative of the activating sonar signal having been received by the transponder. In response to identifying the activating sonar signal, the transponder transmits a responding multifrequency sonar signal. 4 figs.

Young, K.K.; Wilkes, R.J.

1995-11-21T23:59:59.000Z

185

Digital sonar system  

DOE Patents (OSTI)

A transponder of an active digital sonar system identifies a multifrequency underwater activating sonar signal received from a remote sonar transmitter. The transponder includes a transducer that receives acoustic waves, including the activating sonar signal, and generates an analog electrical receipt signal. The analog electrical receipt signal is converted to a digital receipt signal and cross-correlated with a digital transmission signal pattern corresponding to the activating sonar signal. A relative peak in the cross-correlation value is indicative of the activating sonar signal having been received by the transponder. In response to identifying the activating sonar signal, the transponder transmits a responding multifrequency sonar signal.

Young, Kenneth K. (Seattle, WA); Wilkes, R. Jeffrey (Seattle, WA)

1995-01-01T23:59:59.000Z

186

Representing digital assets usingMPEG-21 Digital Item Declaration  

Science Conference Proceedings (OSTI)

Various XML-based approaches aimed at representing compound digital assets have emerged over the last several years. Approaches that are of specific relevance to the digital library community include the Metadata Encoding and Transmission Standard (METS), ... Keywords: Digital Item, Digital asset, MPEG-21 DID, OAI-PMH, OpenURL

Jeroen Bekaert; Emiel De Kooning; Herbert de Sompel

2006-04-01T23:59:59.000Z

187

Sloan digital sky survey  

SciTech Connect

The Sloan Digital Sky Survey will produce a detailed digital photometric map of half the northern sky to about 23 magnitude using a special purpose wide field 2.5 meter telescope. From this map we will select {approximately} 10{sup 6} galaxies and 10{sup 5} quasars, and obtain high resolution spectra using the same telescope. The imaging catalog will contain 10{sup 8} galaxies, a similar number of stars, and 10{sup 6} quasar candidates.

Kent, S.M.; Stoughton, C.; Newberg, H.; Loveday, J.; Petravick, D.; Gurbani, V.; Berman, E.; Sergey, G. [Fermi National Accelerator Lab., Batavia, IL (United States); Lupton, R. [Princeton Univ., NJ (United States)

1994-04-01T23:59:59.000Z

188

Sensorless Direct Torque Control For Salient Pole PMSM Based on Extended Kalman Filter Fed By AC/DC/AC Converter  

E-Print Network (OSTI)

, Algeria Abstract -- In this paper, a new sensorless Interior Permanent Magnet Synchronous Motor (IPMSM. Key words-- DTC; sensorless control; extended Kalman filter; Permanent Magnet Synchronous Motor; boost-rectifier. I. INTRODUCTION Permanent magnet synchronous motors (PMSMS) are widely used in many applications

Paris-Sud XI, Université de

189

Direct observation of dynamic surface acoustic wave controlled carrier injection into single quantum posts using phase-resolved optical spectroscopy  

E-Print Network (OSTI)

A versatile stroboscopic technique based on active phase-locking of a surface acoustic wave to picosecond laser pulses is used to monitor dynamic acoustoelectric effects. Time-integrated multi-channel detection is applied to probe the modulation of the emission of a quantum well for different frequencies of the surface acoustic wave. For quantum posts we resolve dynamically controlled generation of neutral and charged excitons and preferential injection of holes into localized states within the nanostructure.

Völk, S; Schülein, F J R; Truong, T A; Kim, H; Petroff, P M; Wixforth, A; Krenner, H J

2010-01-01T23:59:59.000Z

190

Direct observation of dynamic surface acoustic wave controlled carrier injection into single quantum posts using phase-resolved optical spectroscopy  

E-Print Network (OSTI)

A versatile stroboscopic technique based on active phase-locking of a surface acoustic wave to picosecond laser pulses is used to monitor dynamic acoustoelectric effects. Time-integrated multi-channel detection is applied to probe the modulation of the emission of a quantum well for different frequencies of the surface acoustic wave. For quantum posts we resolve dynamically controlled generation of neutral and charged excitons and preferential injection of holes into localized states within the nanostructure.

S. Völk; F. Knall; F. J. R. Schülein; T. A. Truong; H. Kim; P. M. Petroff; A. Wixforth; H. J. Krenner

2010-11-08T23:59:59.000Z

191

ADVISORY ALERT: Dekker, Ltd. Digital Signature - PARS II Reporting  

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

ADVISORY ALERT: Dekker, Ltd. Digital Signature - PARS II Reporting ADVISORY ALERT: Dekker, Ltd. Digital Signature - PARS II Reporting As you know, to run reports in the PARS II, users must install an active X control to their workstations. The FIRST TIME a user attempts to run a report after installing the Active X control, a Security Warning will appear stating: That warning appears because, although the digital signature is valid, the digital signature is from a publisher (in this case Dekker, Ltd.) whom you have not yet chosen to trust. The following steps instruct you how to clear the security warning so that you may continue working with PARS II reports. Please note: Once you complete the process of accepting the Dekker, LTd. digital signature, this warning will not re-appear. This process must be done ONCE to "inform" your PC that Dekker, LTd. is an

192

Digital optical conversion module  

DOE Patents (OSTI)

A digital optical conversion module used to convert an analog signal to a computer compatible digital signal including a voltage-to-frequency converter, frequency offset response circuitry, and an electrical-to-optical converter. Also used in conjunction with the digital optical conversion module is an optical link and an interface at the computer for converting the optical signal back to an electrical signal. Suitable for use in hostile environments having high levels of electromagnetic interference, the conversion module retains high resolution of the analog signal while eliminating the potential for errors due to noise and interference. The module can be used to link analog output scientific equipment such as an electrometer used with a mass spectrometer to a computer.

Kotter, Dale K. (North Shelley, ID); Rankin, Richard A. (Ammon, ID)

1991-02-26T23:59:59.000Z

193

Digital optical conversion module  

DOE Patents (OSTI)

A digital optical conversion module used to convert an analog signal to a computer compatible digital signal including a voltage-to-frequency converter, frequency offset response circuitry, and an electrical-to-optical converter. Also used in conjunction with the digital optical conversion module is an optical link and an interface at the computer for converting the optical signal back to an electrical signal. Suitable for use in hostile environments having high levels of electromagnetic interference, the conversion module retains high resolution of the analog signal while eliminating the potential for errors due to noise and interference. The module can be used to link analog output scientific equipment such as an electrometer used with a mass spectrometer to a computer. 2 figs.

Kotter, D.K.; Rankin, R.A.

1988-07-19T23:59:59.000Z

194

Digital Geologic Field Mapping Using Arcpad, In: Digital Mapping Techniques  

Open Energy Info (EERE)

Digital Geologic Field Mapping Using Arcpad, In: Digital Mapping Techniques Digital Geologic Field Mapping Using Arcpad, In: Digital Mapping Techniques '02- Workshop Proceedings Jump to: navigation, search OpenEI Reference LibraryAdd to library Report: Digital Geologic Field Mapping Using Arcpad, In: Digital Mapping Techniques '02- Workshop Proceedings Abstract Research into the practicality of digital mapping by Placer Dome Exploration identified hardware and software solutions to enhance the efficiency and accuracy of field work. The goal of the research was to find a lightweight hardware-software system that allows the user to build a digital map from field observations in much the same way as pen and paper methods. The focus of the research was to minimize the size and weight of computer systems. Systems identified consist of a wearable PC or handheld

195

Control of the direction and rate of nuclear spin flips in InAs quantum dots using detuned optical pulse trains  

E-Print Network (OSTI)

We find that detuning an optical pulse train from electronic transitions in quantum dots controls the direction of nuclear spin flips. The optical pulse train generates electron spins that precess about an applied magnetic field, with a spin component parallel to the field only for detuned pulses. This component leads to asymmetry in the nuclear spin flips, providing a way to produce a stable and precise value of the nuclear spin polarization. This effect is observed using two-color, time-resolved Faraday rotation and ellipticity.

S. G. Carter; A. Shabaev; Sophia E. Economou; T. A. Kennedy; A. S. Bracker; T. L. Reinecke

2009-01-16T23:59:59.000Z

196

ELECTRONIC DIGITAL COMPUTER  

DOE Patents (OSTI)

The electronic digital computer is designed to solve systems involving a plurality of simultaneous linear equations. The computer can solve a system which converges rather rapidly when using Von Seidel's method of approximation and performs the summations required for solving for the unknown terms by a method of successive approximations.

Stone, J.J. Jr.; Bettis, E.S.; Mann, E.R.

1957-10-01T23:59:59.000Z

197

Double-digit growth  

SciTech Connect

The global need for additional generating capacity continues to grow at double digit rates in some cases. Opportunities for partnerships and joint ventures vary considerably by country and region. A closer look is taken at five countries where the playing fields are increasingly tipping to favor outside partners in power development projects -- India, Indonesia, Malaysia, Thailand, and Mexico.

Cartselos, T.; Meade, W.; Hernandez, L.

1993-09-01T23:59:59.000Z

198

Digital Strategy | Department of Energy  

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

Digital Strategy Digital Strategy Digital Strategy November 21, 2013 - 5:15pm Addthis Implementing the Federal Digital Strategy Implementing the Federal Digital Strategy Alex Cohen Alex Cohen Senior Digital Information Strategist New expectations require the Federal Government to be ready to deliver and receive digital information and services anytime, anywhere and on any device. It must do so safely, securely, and with fewer resources. To build for the future, the Federal Government has developed a Digital Strategy that embraces the opportunity to innovate more with less, and enables entrepreneurs to better leverage government data to improve the quality of services to the American people. The Energy Department has responded to this challenge through key initiatives that make high-value data sets available through API's that

199

Digital buildings - Challenges and opportunities  

Science Conference Proceedings (OSTI)

This paper considers the wider implications of digital buildings (as currently exemplified by building information models) becoming the norm within the building construction sector. Current deployment is reviewed and the growing opportunity to better ... Keywords: BIM, Building, Digital, Futures, Sustainability

Alastair Watson

2011-10-01T23:59:59.000Z

200

Additive assembly of digital materials  

E-Print Network (OSTI)

This thesis develops the use of additive assembly of press-fit digital materials as a new rapid-prototyping process. Digital materials consist of a finite set of parts that have discrete connections and occupy discrete ...

Ward, Jonathan (Jonathan Daniel)

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "direct digital controls" 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

Optical watthour meter digitizer  

SciTech Connect

As concern about energy conservation and energy-use efficiency increases, a simple and inexpensive instrument that would provide accurate, reliable and high-resolution data on electrical energy usage should find widespread application in research and industrial facilities. An instrument that would also provide one or more outputs compatible with a wide range of digital data acquisition systems would be especially appropriate, since the use of automatic data logging equipment is now common, even in small-scale and low-budget operations. An optical watthour meter digitizer was developed which meets these criteria. Based on the induction-type watthour meter, the digitizer provides an output pulse for a fixed amount of energy use. The digitizer senses the motion of the rotor disc of the meter by optically detecting passage of a nonreflective area painted on the underside of the disc. The passage of such area initiates a logic-compatible output pulse that can be used to measure power or energy usage in a variety of ways. The accuracy of the measurement is determined by the watthour meter. The resolution of the measurement is determined by the K/sub h/ constant (in watthours per revolution) of the meter and the number of equally spaced targets painted on the disc. The resolution of this device can be as small as a fraction of a watthour; the resolution of the manually read register on a watthour meter is typically a fraction of a kilowatthour. Several digitizers were fabricated, bench-tested, and installed in the field for long-term performance testing. All are performing satisfactorily.

Andrews, W.H.

1980-10-01T23:59:59.000Z

202

RFI Comments - Digital Management Inc.  

Science Conference Proceedings (OSTI)

... Lessons from energy, oil, gas, or any large manufacturing industry ... Enterprise Encryption Key and Digital Certificate Management Market Outlook. ...

2013-04-08T23:59:59.000Z

203

A digital metadata schema repository  

Science Conference Proceedings (OSTI)

The metadata schema of a digital archive describes the structure and attributes of metadata. Analysis and definition of metadata schema for a new digital archive must be carefully performed at the first stage. To ease the task, we implement a metadata ... Keywords: HTML, XML, digital archive, metadata schema repository, native XML database, web-based

Yen-Chun Lin; Hsiang-An Wang; Chien-Chung Huang; Wei Chen

2008-05-01T23:59:59.000Z

204

Directional Handoff using Geomagnetic Sensor in Indoor WLANs Sangyup Han  

E-Print Network (OSTI)

Directional Handoff using Geomagnetic Sensor in Indoor WLANs Sangyup Han , Myungchul Kim , Ben Lee a geomagnetic sensor (or a digital compass) embedded in mobile devices. The proposed scheme predicts; Directional handoff; Geomagnetic sensor; Digital compass; AP Table I. INTRODUCTION With the popularity

Lee, Ben

205

Prototype of time digitizing system for BESIII endcap TOF upgrade  

E-Print Network (OSTI)

The prototype of time digitizing system for the upgrade of BESIII endcap TOF (ETOF) is introduced in this paper. The ETOF readout electronics has a formation of distributed architecture that hit signal from multi-gap resistive plate chamber (MRPC) is signaled as LVDS by front-end electronics (FEE) and sent to the back-end time digitizing system via long shield differential twisted pair cables. The ETOF digitizing system consists of 2 VME crates each of which contains modules of time digitizing, clock, trigger and fast control etc. The time digitizing module (TDIG) of this prototype can support up to 72 electrical channels of hit information measurement. The fast control (FCTL) module can operate at barrel or endcap mode. The barrel FCTL fans fast control signals from the trigger system out to endcap FCTLs, merges data from endcaps and transfers to the trigger system. Without modifying the barrel TOF structure, this time digitizing architecture benefits for improving ETOF performance without degrading barrel TOF measuring. Lab experiments show that the time resolution of this digitizing system can be less than 20ps, and the data throughput to DAQ can be about 92Mbps. Beam experiments show that the complete time resolution can be less than 45ps.

Cao Ping; Sun Wei-Jia; Ji Xiao-Lu; Fan Huan-Huan; Wang Si-Yu; Liu Shu-Bin; An Qi

2013-05-30T23:59:59.000Z

206

The Sustainable Enterprise: Enabling the Digital Thread  

Science Conference Proceedings (OSTI)

Page 1. The Sustainable Enterprise: Enabling the Digital Thread ... Verify & Validate Digital Thread Supports Honeywell's Sustainable Enterprise ...

2013-02-28T23:59:59.000Z

207

Digital Lumens | Open Energy Information  

Open Energy Info (EERE)

Lumens Lumens Jump to: navigation, search Name Digital Lumens Address 110 Canal Street Place Boston, Massachusetts Zip 02114 Product Intelligent Lighting System Year founded 2008 Number of employees 11-50 Phone number (617) 723-1200 Website http://www.digitallumens.com Coordinates 42.3644808°, -71.0602745° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.3644808,"lon":-71.0602745,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

208

Digital scale converter  

DOE Patents (OSTI)

A digital scale converter is provided for binary coded decimal (BCD) conversion. The converter may be programmed to convert a BCD value of a first scale to the equivalent value of a second scale according to a known ratio. The value to be converted is loaded into a first BCD counter and counted down to zero while a second BCD counter registers counts from zero or an offset value depending upon the conversion. Programmable rate multipliers are used to generate pulses at selected rates to the counters for the proper conversion ratio. The value present in the second counter at the time the first counter is counted to the zero count is the equivalent value of the second scale. This value may be read out and displayed on a conventional seven-segment digital display.

Upton, Richard G. (Oak Ridge, TN)

1978-01-01T23:59:59.000Z

209

Metrological digital audio reconstruction  

DOE Patents (OSTI)

Audio information stored in the undulations of grooves in a medium such as a phonograph record may be reconstructed, with little or no contact, by measuring the groove shape using precision metrology methods coupled with digital image processing and numerical analysis. The effects of damage, wear, and contamination may be compensated, in many cases, through image processing and analysis methods. The speed and data handling capacity of available computing hardware make this approach practical. Two examples used a general purpose optical metrology system to study a 50 year old 78 r.p.m. phonograph record and a commercial confocal scanning probe to study a 1920's celluloid Edison cylinder. Comparisons are presented with stylus playback of the samples and with a digitally re-mastered version of an original magnetic recording. There is also a more extensive implementation of this approach, with dedicated hardware and software.

Fadeyev; Vitaliy (Berkeley, CA), Haber; Carl (Berkeley, CA)

2004-02-19T23:59:59.000Z

210

DIGITAL Q METER  

DOE Patents (OSTI)

A digital Q meter is described for measuring the Q of mechanical or electrical devices. The meter comprises in combination a transducer coupled to an input amplifier, and an upper and lower level discriminator coupled to the amplifier and having their outputs coupled to an anticoincidence gate. The output of the gate is connected to a scaler. The lower level discriminator is adjusted to a threshold level of 36.8 percent of the operating threshold level of the upper level discriminator. (AEC)

Briscoe, W.L.

1962-02-13T23:59:59.000Z

211

Handbook on Regression Testing of Digital Systems  

Science Conference Proceedings (OSTI)

Even after established use in power plants, digital monitoring, control, and protection systems typically undergo necessary changes to fix defects, make necessary improvements to functionality, and adapt to the evolution of commercially supported components. These common changes can introduce new defects and cause previously fixed defects to reappear. This handbook is concerned with regression testing, a software testing technique that focuses on ensuring that modifications to proven software-based syste...

2008-02-28T23:59:59.000Z

212

JGI - Directions  

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

Map to JGI Directions from Directions from key local start points, public transit Home > About Us > Map to JGI UC logo DOE logo Contact Us Credits Disclaimer Access...

213

DOE Digital Photo Archive  

DOE Data Explorer (OSTI)

The DOE Digital Photo Archive is a resource made available to the DOE community as well as the general public for the purposes of enhancing communication, education, and ultimately the overall mission of the Department of Energy (DOE). The images in the Archive are downloadable as low resolution JPG files and may easily and quickly be requested in high resolution. The database can be browsed or is searchable by science program, sites by name, geographic locations, etc. Each photo has a caption or brief summary, and most are not copyrighted.

214

A Automated Tool for Supporting FMEAs of Digital Systems  

SciTech Connect

Although designs of digital systems can be very different from each other, they typically use many of the same types of generic digital components. Determining the impacts of the failure modes of these generic components on a digital system can be used to support development of a reliability model of the system. A novel approach was proposed for such a purpose by decomposing the system into a level of the generic digital components and propagating failure modes to the system level, which generally is time-consuming and difficult to implement. To overcome the associated issues of implementing the proposed FMEA approach, an automated tool for a digital feedwater control system (DFWCS) has been developed in this study. The automated FMEA tool is in nature a simulation platform developed by using or recreating the original source code of the different module software interfaced by input and output variables that represent physical signals exchanged between modules, the system, and the controlled process. For any given failure mode, its impacts on associated signals are determined first and the variables that correspond to these signals are modified accordingly by the simulation. Criteria are also developed, as part of the simulation platform, to determine whether the system has lost its automatic control function, which is defined as a system failure in this study. The conceptual development of the automated FMEA support tool can be generalized and applied to support FMEAs for reliability assessment of complex digital systems.

Yue,M.; Chu, T.-L.; Martinez-Guridi, G.; Lehner, J.

2008-09-07T23:59:59.000Z

215

NIST Digital Media Group: publications  

Science Conference Proceedings (OSTI)

... Guide (See above guide) Download PDF (294 KB) NIST/Library of Congress ... SPIE Conf. ... Mastering and Archiving Uncompressed Digital Video Test ...

216

Digital Intermediate Frequency Receiver Module For Use In Airborne Sar Applications  

DOE Patents (OSTI)

A digital IF receiver (DRX) module directly compatible with advanced radar systems such as synthetic aperture radar (SAR) systems. The DRX can combine a 1 G-Sample/sec 8-bit ADC with high-speed digital signal processor, such as high gate-count FPGA technology or ASICs to realize a wideband IF receiver. DSP operations implemented in the DRX can include quadrature demodulation and multi-rate, variable-bandwidth IF filtering. Pulse-to-pulse (Doppler domain) filtering can also be implemented in the form of a presummer (accumulator) and an azimuth prefilter. An out of band noise source can be employed to provide a dither signal to the ADC, and later be removed by digital signal processing. Both the range and Doppler domain filtering operations can be implemented using a unique pane architecture which allows on-the-fly selection of the filter decimation factor, and hence, the filter bandwidth. The DRX module can include a standard VME-64 interface for control, status, and programming. An interface can provide phase history data to the real-time image formation processors. A third front-panel data port (FPDP) interface can send wide bandwidth, raw phase histories to a real-time phase history recorder for ground processing.

Tise, Bertice L. (Albuquerque, NM); Dubbert, Dale F. (Cedar Crest, NM)

2005-03-08T23:59:59.000Z

217

Direct To Digital Holography For High Aspect Ratio Inspection ...  

Science Conference Proceedings (OSTI)

... effects • Investigating using full wave 3-D finite difference time domain approach – For example Tempest Page 12. Comparison of 1-D TL theory with ...

218

DIGITAL VIDEO CAMCORDER Instruction Manual  

E-Print Network (OSTI)

'emploi VIDEOCÁMARA Y GRABADORA DIGITAL Manual de Instrucciones ENGLISH FRAN�AIS ESPA�OL Mini Digital Video Cassette. This equipment generates, uses and can radiate radio frequency energy and, if not installed and use in accordance devices or other sources of electric or magnetic radiation. They may cause picture interference

219

Scalable Access within the Context of Digital Libraries  

E-Print Network (OSTI)

This paper presents a summary of some of the work-in-progress within the Alexandria Digital Library Project. In particular, we present scalable methods of locating information at different levels within a distributed digital library environment. Starting at the high level, we show how queries can be routed to appropriate information sources. At a given source, efficient query processing is supported by using materialized views and multidimensional index structures. Finally, we propose solutions to the problem of storage and retrieval of large objects on secondary and tertiary storage. 1 Introduction Library services provide efficient access to information implicit in collections of information-bearing objects such as text documents and maps. Traditional libraries, based on information in non-digital form, are characterized by a limited set of services that provide relatively coarse-grained access to the information in controlled collections of items. Digital libraries, based on infor...

X. Cheng; R. Dolin; M. Neary; S. Prabhakar; K. V. Ravi; Kanth D. Wu; D. Agrawal; A. El; Abbadi M. Freeston; A. Singh; T. Smith; J. Su

1997-01-01T23:59:59.000Z

220

TRAINING SEMINARS OFFERED DIGITAL TROUBLESHOOTING VIDEOTAPES AVAILABLE  

E-Print Network (OSTI)

Hewlett-Packard is offering a series of seminars for service technicians. Some of these are very general (such as Digital Troubleshooting), while others apply to a specific product. Since this is of such significance to service personnel, the September-October and November-December issue of BENCH BRIEFS e has been combined into a special double issue on service training. A number of locations have been chosen for seminars in January and February, 1976. See the following pages for details of course offerings and locations. Most seminars include laboratory time to allow hands-on experience with the hardware. To ensure individual attention for the attendees, all seminars are limited in size. We suggest registering early to avoid disappointment. Registration will be handled on a first-come firstserved basis. Many of these seminars are available at your facility at reduced rates for large groups. Please inquire for details. NOTE: While these seminars are being held only in the U.S. and Canada, readers in other countries will be interested to know that service training seminars are being planned for several additional locations throughout the world. We encourage your comments. Please lcontact your local HP sales engineer or write directly to the BENCH BRIEFS Editor at the address on the last page. A series of fourteen videotapes is available to help train service personnel on the increasingly encompassing area of digital electronics. Each of the videotapes is less than 30 minutes in length. The tapes were prepared by Dick Gasperini, BENCH BRIEFS Editor, who has repeatedly presented and revised the material in live seminars throughout the world. The information in the videotape series and in the textbook is very similar to the first two days of the Digital Troubleshooting seminar described on the next page. The individual tapes are: 1. Digital vs Analog (17 min) 2. RTL and DTL (16 min)

unknown authors

1975-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "direct digital controls" 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

Introduction Direct seeding, also known as direct sowing, is  

E-Print Network (OSTI)

Introduction Direct seeding, also known as direct sowing, is an ancient method of woodland that control of competing vegetation is essential for successful tree establishment using direct sowing. Hand, Willoughby (2002) suggests total overall herbicide inputs may be lower in direct seeded woodland due

222

OpenEI Community - Federal Digital Strategy  

Open Energy Info (EERE)

part of the Federal Digital Strategy http:en.openei.orgcommunityblogopenei-part-federal-digital-strategy

223

The Cost of Power Disturbances to Industrial and Digital Economy Companies June 2001 ID: 1006274  

Science Conference Proceedings (OSTI)

This report was originally published and is the same as EPRI Product 1006274, The Cost of Power Disturbances to Industrial and Digital Economy Companies, (June 2001).The importance of reliable, high-quality electrical power continues to grow as society becomes ever more reliant on digital circuitry for everything from e-commerce to industrial process controllers to the onboard circuitry in toasters and televisions. With this shift to a digital society, business activities ...

2013-03-18T23:59:59.000Z

224

JGI - Directions  

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

Directions Address DOE Joint Genome Institute 2800 Mitchell Drive Walnut Creek, CA 94598 From Oakland Airport Follow Airport exit signs onto AIRPORT DR. Turn RIGHT onto HEGENBERGER...

225

Digital Divide: How Can Digital Libraries Bridge the Gap?  

Science Conference Proceedings (OSTI)

Recent developments in Information and Communication Technologies (ICT) have, while making our life easier, created a social divide known as the digital divide. Statistics show that there are significant disparities among the populations in the developed ...

Gobinda G. Chowdhury

2002-12-01T23:59:59.000Z

226

The application of taylor weighting, digital phase shifters, and digital attenuators to phased-array antennas.  

SciTech Connect

Application of Taylor weighting (taper) to an antenna aperture can achieve low peak sidelobes, but combining the Taylor weighting with quantized attenuators and phase shifters at each radiating element will impact the performance of a phased-array antenna. An examination of array performance is undertaken from the simple point of view of the characteristics of the array factor. Design rules and guidelines for determining the Taylor-weighting parameters, the number of bits required for the digital phase shifter, and the dynamic range and number of bits required for the digital attenuator are developed. For a radar application, when each element is fed directly from a transmit/receive module, the total power radiated by the array will be reduced as a result of the taper. Consequently, the issue of whether to apply the taper on both transmit and receive configurations, or only on the receive configuration is examined with respect to two-way sidelobe performance.

Brock, Billy C.

2008-03-01T23:59:59.000Z

227

Environmental testing of an experimental digital safety channel  

SciTech Connect

This document presents the results of environmental stress tests performed on an experimental digital safety channel (EDSC) assembled at the Oak Ridge National Laboratory (ORNL) as part of the NRC-sponsored Qualification of Advanced Instrumentation and Controls (W) System program. The objective of this study is to investigate failure modes and vulnerabilities of microprocessor-based technologies when subjected to environmental stressors. The study contributes to the technical basis for environmental qualification of safety-related digital I&C systems. The EDSC employs technologies and digital subsystems representative of those proposed for use in advanced light-water reactors (ALWRs) or for retrofits in existing plants. Subsystems include computers, electrical and optical serial communication links, fiber-optic network links, analog-to-digital and digital-to-analog converters, and multiplexers. The EDSC was subjected to selected stressors that are a potential risk to digital equipment in a mild environment. The selected stressors were electromagnetic and radio-frequency interference (EMYRFI), temperature, humidity, and smoke exposure. The stressors were applied over ranges that were considerably higher than what the channel is likely to experience in a normal nuclear power plant environment. Ranges of stress were selected at a sufficiently high level to induce errors so that failure modes that are characteristic of the technologies employed could be identified.

Korsah, K.; Tanaka, T.J.; Wilson, T.L. Jr.; Wood, R.T.

1996-09-01T23:59:59.000Z

228

An Emulated Digital CNN Implementation  

Science Conference Proceedings (OSTI)

A new emulated digital CNN Universal Machine chip architecture is introduced and the main steps of the design process are shown in this paper. One core processor can be implemented on 2 × 2 mm^2 silicon ...

Péter Keresztes; ákos Zarándy; Tamás Roska; Péter Szolgay; Tamás Bezák; Timót Hidvégi; Péter Jónás; Attila Katona

1999-11-01T23:59:59.000Z

229

Digital Modeling of Material Appearance  

Science Conference Proceedings (OSTI)

Computer graphics systems are capable of generating stunningly realistic images of objects that have never physically existed. In order for computers to create these accurately detailed images, digital models of appearance must include robust data to ... Keywords: Computer Graphics

Julie Dorsey; Holly Rushmeier; Franois Sillion

2007-12-01T23:59:59.000Z

230

MULTIPLE INPUT BINARY ADDER EMPLOYING MAGNETIC DRUM DIGITAL COMPUTING APPARATUS  

DOE Patents (OSTI)

A digital computing apparatus is described for adding a plurality of multi-digit binary numbers. The apparatus comprises a rotating magnetic drum, a recording head, first and second reading heads disposed adjacent to the first and second recording tracks, and a series of timing signals recorded on the first track. A series of N groups of digit-representing signals is delivered to the recording head at time intervals corresponding to the timing signals, each group consisting of digits of the same significance in the numbers, and the signal series is recorded on the second track of the drum in synchronism with the timing signals on the first track. The multistage registers are stepped cyclically through all positions, and each of the multistage registers is coupled to the control lead of a separate gate circuit to open the corresponding gate at only one selected position in each cycle. One of the gates has its input coupled to the bistable element to receive the sum digit, and the output lead of this gate is coupled to the recording device. The inputs of the other gates receive the digits to be added from the second reading head, and the outputs of these gates are coupled to the adding register. A phase-setting pulse source is connected to each of the multistage registers individually to step the multistage registers to different initial positions in the cycle, and the phase-setting pulse source is actuated each N time interval to shift a sum digit to the bistable element, where the multistage register coupled to bistable element is operated by the phase- setting pulse source to that position in its cycle N steps before opening the first gate, so that this gate opens in synchronism with each of the shifts to pass the sum digits to the recording head.

Cooke-Yarborough, E.H.

1960-12-01T23:59:59.000Z

231

Digital preservation: overview of current developments  

Science Conference Proceedings (OSTI)

ICSTI and ICSU Press, with support from UNESCO, co-sponsored a workshop on digital archiving that brought major stakeholders together to identify the key issues for each group in January 2000. The state of digital archiving art and practice at the time ... Keywords: business models, cooperation, digital archiving, digital preservation, framework, funding, guidelines, policies, projects, stakeholder roles, technologies

Gail M. Hodge

2002-01-01T23:59:59.000Z

232

Automated user modeling for personalized digital libraries  

Science Conference Proceedings (OSTI)

Digital libraries (DLs) have become one of the most typical ways of accessing any kind of digitalized information. Due to this key role, users welcome any improvements on the services they receive from DLs. One trend used to improve digital services ... Keywords: Adaptive library services, Digital libraries, Personalization, User modeling

E. Frias-Martinez; G. Magoulas; S. Chen; R. Macredie

2006-06-01T23:59:59.000Z

233

Preserving digital data in heterogeneous environments  

Science Conference Proceedings (OSTI)

Digital preservation aims at maintaining digital objects accessible over a long period of time, regardless of the challenges of organizational or technological changes or failures. In particular, data produced in e-Science domains could be reliably stored ... Keywords: data grids, dependability, digital libraries, digital preservation

Gonçalo Antunes; José Barateiro; Manuel Cabral; José Borbinha; Rodrigo Rodrigues

2009-06-01T23:59:59.000Z

234

Decimal System and Double Digits  

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

Decimal System and Double Digits Decimal System and Double Digits Name: Ken Status: other Grade: other Country: Canada Date: April 2011 Question: If the origin of the decimal system reflects counting on ten fingers and if zero came into use after the decimal system had been established why did we not create a single symbol for our tenth digit rather than use the double digit 10? If T were to represent the tenth number this would have created a counting system where the number series 1,2...9,T is followed by the same series having a 1 to the left then followed by the same series having a 2 to the left, etc. The T would be the last number in a series of ten single digits rather than be the first number in a series of double digits. The symbol zero would be used only between negative one and positive one because it represents the existence of nothing and, therefore, would have no other function.

235

Three phase AC motor controller  

DOE Patents (OSTI)

A motor controller for a three phase AC motor (10) which is adapted to operate bidirectionally from signals received either from a computer (30) or a manual control (32). The controller is comprised of digital logic circuit means which implement a forward and reverse command signal channel (27, 29) for the application of power through the forward and reverse power switching relays (16, 18, 20, 22). The digital logic elements are cross coupled to prevent activation of both channels simultaneously and each includes a plugging circuit (65, 67) for stopping the motor upon the removal of control signal applied to one of the two channels (27, 29) for a direction of rotation desired. Each plugging circuit (65, 67) includes a one-shot pulse signal generator (88, 102) which outputs a single pulse signal of predetermined pulsewidth which is adapted to inhibit further operation of the application of power in the channel which is being activated and to apply a reversal command signal to the other channel which provides a reversed phase application of power to the motor for a period defined by the pulse-width output of the one-shot signal generator to plug the motor (10) which will then be inoperative until another rotational command signal is applied to either of the two channels.

Vuckovich, Michael (Elizabeth, PA); Wright, Maynard K. (Bethel Park, PA); Burkett, John P. (South Huntington Township, Westmoreland County, PA)

1984-03-20T23:59:59.000Z

236

Exploring the evolution of digital television in China: An interplay between economic and political interests  

Science Conference Proceedings (OSTI)

This paper argues that the primary obstacles facing the transition to digital TV involve: (1) administrative infighting, (2) heavy-handed policymaking processes, and (3) the pursuit of self-interest and centralized control by the state network. After ... Keywords: Broadcasting, Digital, Political and Economic Progress, Telematics, Television

Charles G. C. Feng; T. Y. Lau; David J. Atkin; Carolyn A. Lin

2009-11-01T23:59:59.000Z

237

Plant Modernization with Digital Reactor Protection System Safety System Upgrades at US Nuclear Power Stations  

SciTech Connect

As the current fleet of nuclear power plants in the US reaches 25+ years of operation, obsolescence is driving many utilities to implement upgrades to both their safety and non-safety-related Instrumentation and Control (I and C) Systems. Digital technology is the predominant replacement technology for these upgrades. Within the last 15 years, digital control systems have been deployed in non-safety- related control applications at many utilities. In addition, a few utilities have replaced small safety-related systems utilizing digital technology. These systems have shown digital technology to be robust, reliable and simpler to maintain. Based upon this success, acceptance of digital technology has gained momentum with both utilities and regulatory agencies. Today, in an effort to extend the operating lives of their nuclear stations and resolve obsolescence of critical components, utilities are now pursuing digital technology for replacement of their primary safety systems. AREVA is leading this effort in the United States with the first significant digital upgrade of a major safety system. AREVA has previously completed upgrades to safety-related control systems emergency diesel engine controls and governor control systems for a hydro station which serves as the emergency power source for a nuclear station. Currently, AREVA is implementing the replacement of both the Reactor Protection System (RPS) and the Engineered Safety Features Actuation System (ESFAS) on all three units at a US PWR site. (authors)

Heckle, Wm. Lloyd; Bolian, Tricia W. [AREVA NP, an AREVA and Siemens Company, 1345 Ridgeland Parkway, Suite 130 (United States)

2006-07-01T23:59:59.000Z

238

Reviren: augmenting virtual environments with personal digital assistants  

Science Conference Proceedings (OSTI)

Our research group is currently embarked on building cheap display-based virtual environments. With the use of Personal Digital Assistants becoming more widespread and commonplace, there is a need to investigate ways of allowing them to integrate better ... Keywords: design, dynamic interface, human factors, mobile interface, virtual environment control

Richard Schroder; Marc Bosma; Andrew Cousins; Gary Marsden

2004-10-01T23:59:59.000Z

239

Digital government and citizen participation in international context  

Science Conference Proceedings (OSTI)

This book provides abundant evidence that the shift towards digital government is part of a sweeping set of changes. These are best viewed holistically, as they relate to pervasive shifts in the locus and purpose of many forms of control. These changes ...

Karin Geiselhart

2004-01-01T23:59:59.000Z

240

From Digital Library to Digital Government: A Case Study in Crime Data Mapping and Mining  

Science Conference Proceedings (OSTI)

In light of the significant research activities in digital library, digital government, and e-commerce over the past decade, there seems to be common threads among them and unique challenges and opportunities ahead. For digital library, we are beginning ...

Hsinchun Chen

2002-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "direct digital controls" 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

Digital Bond Fact Sheet.cdr  

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

cost-shared effort between industry and cost-shared effort between industry and Cyber Security Audit and Attack Detection Toolkit Cyber Security Audit and Attack Detection Toolkit Bandolier Audit Files for optimizing security configurations and the Portaledge event detection capability for energy control systems Bandolier Audit Files for optimizing security configurations and the Portaledge event detection capability for energy control systems Cyber Security for Energy Delivery Systems Electricity Delivery & Energy Reliability Project Lead: Digital Bond Partners: OSIsoft Tenable Network Security PacifiCorp Tennessee Valley Authority Other Participating Vendors: ABB AREVA Emerson Matrikon SNC Telvent Bandolier and Portaledge The Concept Bandolier-The Approach By building configuration audit and attack detection capabilities into tools already

242

Digital Networks: Electronics and Beyond  

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

Digital Networks: Electronics and Beyond Digital Networks: Electronics and Beyond Speaker(s): Bruce Nordman Date: January 9, 2009 - 12:00pm Location: 90-3122 For the last five years or so, I have made digital networks my prime research focus. For the most part, this has concentrated on IT networks as with PCs and servers, and the network interfaces and network devices that enable it. I will outline how to think about networks as they collide with energy use and efficiency, and report on the several projects we have underway in this area. Networks have a unique relationship to industry standards and I will outline some of the challenges and opportunities this brings. In addition, we have the looming prospect of the networking of many non-electronic loads in buildings (particularly lighting and climate

243

Apparatus and method for managing digital resources by passing digital resource tokens between queues  

DOE Patents (OSTI)

A method of managing digital resources of a digital system includes the step of reserving token values for certain digital resources in the digital system. A selected token value in a free-buffer-queue is then matched to an incoming digital resource request. The selected token value is then moved to a valid-request-queue. The selected token is subsequently removed from the valid-request-queue to allow a digital agent in the digital system to process the incoming digital resource request associated with the selected token. Thereafter, the selected token is returned to the free-buffer-queue. 6 figs.

Crawford, H.J.; Lindenstruth, V.

1999-06-29T23:59:59.000Z

244

On The Independence Of Digits In Connected Digit Strings  

E-Print Network (OSTI)

One of the frequently used assumptions in Speaker Verification is that two speech segments (phonemes, subwords, words) are considered to be independent. And therefore, the log-likelihood of a test utterance is just the sum of the log-likelihoods of the speech segments in that utterance. This paper reports about cases in which this observation-independence assumption seems to be violated, namely for those test utterances which call a certain speech model more than once. For example, a pin code which contains a non-unique digit set performs worse in verification than a pin code which consists of four different digits. Results illustrate that violating the independence assumption too much might result in increasing EERs while more information (in form of digits) is added to the test utterance. 1. INTRODUCTION In Speaker Verification (SV) systems using passwords in the form of fixed or prompted digit strings it seems usual to compute the log-likelihood of a claimant being the true speaker...

Johan Koolwaaij; Lou Boves

1995-01-01T23:59:59.000Z

245

An approach to the design of highly reliable and fail-safe digital systems  

Science Conference Proceedings (OSTI)

Recent progress in electronic technology has resulted in extensive use of electronic digital or logical systems in many complex control processes where weight or size as well as reliability and safety is important. Typical examples are, to name a few, ...

Henry Y. H. Chuang; Santanu Das

1974-05-01T23:59:59.000Z

246

Automated and human determination of threshold contrast for digital mammography systems  

Science Conference Proceedings (OSTI)

European Guidelines for quality control in digital mammography specify minimum and achievable standards of image quality in terms of threshold contrast, based on readings of images of the CDMAM test object by human observers. However this is time-consuming ...

Kenneth C. Young; James J. H. Cook; Jennifer M. Oduko

2006-06-01T23:59:59.000Z

247

This work presents an improved variant of the Direct Torque Control (DTC) for a Permanent Magnet Synchronous Motor (PMSM). The improved DTC use a higher  

E-Print Network (OSTI)

Magnet Synchronous Motor (PMSM). The improved DTC use a higher number of voltage space vectors;Contents I Introduction 5 Chapter 1 Permanent Magnet Synchronous Motor 6 1.1 Derivation of motor equations Voltage Source Inverter PMSM Permanent Magnet Synchronous Motor 4 #12;I. Introduction Direct Torque

Johansson, Karl Henrik

248

U-084: Cisco Digital Media Manager Lets Remote Authenticated Users Gain  

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

84: Cisco Digital Media Manager Lets Remote Authenticated Users 84: Cisco Digital Media Manager Lets Remote Authenticated Users Gain Elevated Privileges U-084: Cisco Digital Media Manager Lets Remote Authenticated Users Gain Elevated Privileges January 19, 2012 - 9:00am Addthis PROBLEM: A remote authenticated user can gain elevated privileges on the target system. PLATFORM: Cisco Digital Media Manager: Version(s) 5.22 and prior, 5.2.3 ABSTRACT: The system does not properly validate unreferenced URLs. REFERENCE LINKS: Vendor Advisory SecurityTracker Alert ID: 1026541 CVE-2012-0329 IMPACT ASSESSMENT: medium Discussion: Cisco Show and Share is not directly affected by this vulnerability, but a user can exploit the Cisco Digital Media Manager to gain full access to Cisco Show and Share. Impact: A remote authenticated user can send a specially crafted URL via TCP port

249

U-084: Cisco Digital Media Manager Lets Remote Authenticated Users Gain  

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

4: Cisco Digital Media Manager Lets Remote Authenticated Users 4: Cisco Digital Media Manager Lets Remote Authenticated Users Gain Elevated Privileges U-084: Cisco Digital Media Manager Lets Remote Authenticated Users Gain Elevated Privileges January 19, 2012 - 9:00am Addthis PROBLEM: A remote authenticated user can gain elevated privileges on the target system. PLATFORM: Cisco Digital Media Manager: Version(s) 5.22 and prior, 5.2.3 ABSTRACT: The system does not properly validate unreferenced URLs. REFERENCE LINKS: Vendor Advisory SecurityTracker Alert ID: 1026541 CVE-2012-0329 IMPACT ASSESSMENT: medium Discussion: Cisco Show and Share is not directly affected by this vulnerability, but a user can exploit the Cisco Digital Media Manager to gain full access to Cisco Show and Share. Impact: A remote authenticated user can send a specially crafted URL via TCP port

250

Fuel Cost Savings Through Computer Control of a Boiler Complex - - Two Case Histories  

E-Print Network (OSTI)

This paper discusses the growing need for energy efficiency in industry and describes a new, packaged approach to fuel optimization through direct digital control and accurate in-stack measurement of combustion products. Results are presented for a large pulp and paper mill complex in which multiple power boilers and turbine generators are controlled so as to meet the total energy demand of the mill at minimum cost. Also discussed are results from a second installation involving control of a combined bark and gas boiler, a gas package boiler and a turbine generator, including utility tie-line control.

Worthley, C. M.

1979-01-01T23:59:59.000Z

251

'Power and the digital divide'  

Science Conference Proceedings (OSTI)

The ethical and political dilemmas raised by Information and Communication Technology (ICT) have only just begun to be understood. The impact of centralised data collection, mass communication technologies or the centrality of computer technology as ... Keywords: Foucault, Information and Communication Technology (ICT), coercion, digital divide, force, power

Jeremy Moss

2002-08-01T23:59:59.000Z

252

Plasma digital density determining device  

DOE Patents (OSTI)

The density of a decaying plasma in an electrically conducting enclosure is determined by applying an excitation to the cavity formed by the enclosure and counting digitally the number of resonant frequencies traversed by the combination of the cavity and the decaying plasma.

Sprott, Julien C. (Madison, WI); Lovell, Thomas W. (Madison, WI); Holly, Donald J. (Madison, WI)

1976-01-01T23:59:59.000Z

253

Privacy, Predictability or Serendipity and Digital Cities  

Science Conference Proceedings (OSTI)

This paper explores the relationship of unplanned social interaction and the fear associated with current attitudes about cities, both place-based and digital. The symbiotic relationship of the physical and digital city is considered. Specifically, the ...

Gary Gumpert; Susan Drucker

2001-10-01T23:59:59.000Z

254

Digital Watermarking and Steganography, 2 edition  

Science Conference Proceedings (OSTI)

Digital audio, video, images, and documents are flying through cyberspace to their respective owners. Unfortunately, along the way, individuals may choose to intervene and take this content for themselves. Digital watermarking and steganography technology ... Keywords: Networking, Security

Ingemar Cox; Matthew Miller; Jeffrey Bloom; Jessica Fridrich; Ton Kalker

2007-11-01T23:59:59.000Z

255

Representing aggregate works in the digital library  

Science Conference Proceedings (OSTI)

This paper studies the challenge of representing aggregate works such as encyclopedias, collected poems and journals in heterogenous digital library collections. Reflecting on the materials used by humanities academics, we demonstrate the varied range ... Keywords: aggregate documents, architecture, digital libraries

George Buchanan; Jeremy Gow; Ann Blandford; Jon Rimmer; Claire Warwick

2007-06-01T23:59:59.000Z

256

Digital cellular solids : reconfigurable composite materials  

E-Print Network (OSTI)

Digital materials are comprised of a small number of types of discrete physical building blocks, which assemble to form constructions that meet the versatility and scalability of digital computation and communication ...

Cheung, Kenneth Chun-Wai

2012-01-01T23:59:59.000Z

257

Digital signal generation for wireless communication systems  

E-Print Network (OSTI)

be achieved. (Supply voltage requirements will be discussedvoltages of digital CMOS processes. 2) Strict adjacent channel power ratio (ACPR) requirements

Rode, Jeremy

2010-01-01T23:59:59.000Z

258

Long-Term Preservation of Digital Material  

E-Print Network (OSTI)

Long-Term Preservation of Digital Material { Building an Archive to Preserve Digital Cultural Heritage from the Internet by Andreas Aschenbrenner Digital information has become seemingly ubiquitous, as technology saturates all aspects of our life. Consequently, people become increasingly dependent on digital information and the Internet as a medium for gaining and exchanging information. At the same time, the structure and content of the Internet growingly mirrors society, making it an important part of our modern cultural heritage.

Andreas Aschenbrenner

2001-01-01T23:59:59.000Z

259

COE 202: Digital Logic Design Combinational Circuits  

E-Print Network (OSTI)

is digital readout found in electronic devices like clocks, TVs, etc. · Made of seven light-emitting diodes

Almulhem, Ahmad

260

Creating an EPICS Based Test Stand Development System for a BPM Digitizer of the Linac Coherent Light Source  

SciTech Connect

The Linac Coherent Light Source (LCLS) is required to deliver a high quality electron beam for producing coherent X-rays. As a result, high resolution beam position monitoring is required. The Beam Position Monitor (BPM) digitizer acquires analog signals from the beam line and digitizes them to obtain beam position data. Although Matlab is currently being used to test the BPM digitizer?s functions and capability, the Controls Department at SLAC prefers to use Experimental Physics and Industrial Control Systems (EPICS). This paper discusses the transition of providing similar as well as enhanced functionalities, than those offered by Matlab, to test the digitizer. Altogether, the improved test stand development system can perform mathematical and statistical calculations with the waveform signals acquired from the digitizer and compute the fast Fourier transform (FFT) of the signals. Finally, logging of meaningful data into files has been added.

Not Available

2011-06-22T23:59:59.000Z

Note: This page contains sample records for the topic "direct digital controls" 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

Digital inclusion in Chilean in rural schools  

Science Conference Proceedings (OSTI)

This paper analyzes conditions for improving digital inclusion in Chilean rural schools, using a multidimensional definition of digital divide. Using qualitative and quantitative data, we focus on teacher's skills, access to communication, Internet connection ... Keywords: digital divide, internet, rural schools, teachers

Jaime Sánchez

2010-06-01T23:59:59.000Z

262

Mobile digital calendars in knowledge work  

Science Conference Proceedings (OSTI)

This article investigates the usage of mobile digital-calendar solutions in a knowledge work setting through the means of an empirical survey (n = 220) among managers and experts in a global telecommunications company. It is indicated, that the mobile digital ... Keywords: PIM, calendar use, digital calendars, electronic calendaring, electronic scheduling, global telecommunications, knowledge work, mobile calendars, mobile communications, mobile computing, personal information management

Anna Sell

2008-08-01T23:59:59.000Z

263

Using standards in digital library design & development  

Science Conference Proceedings (OSTI)

This tutorial will cover a set of Standards and defacto Standards that can play a role in the design and development of Digital Library applications. The Standards that will be discussed are the ISO MPEG-21 Digital Item Declaration, the ISO MPEG-21 Digital ...

Jeroen Bekaert; Xiaoming Liu; Herbert Van de Sompel

2005-06-01T23:59:59.000Z

264

Governance of labor in digital video networks  

Science Conference Proceedings (OSTI)

Theories of digitally distributed labor tend to fall into an idealized, oppositional binary that conflates digital labor systems with critiques that are judgmental rather than based on detailed analyses of the actual system or site. On the one hand are ... Keywords: algorithm, beta, crowdsourcing, digital, governance, internet, technology, television, video

Adam Fish

2011-02-01T23:59:59.000Z

265

A TEST TO DEMONSTRATE A DIGITAL WEB-BASED OILFIELD DATA COLLECTION SERVICE  

SciTech Connect

The U.S. Department of Energy and HIS Energy tested a web-based field data collection service, FieldDIRECT, at NPR-3. FieldDIRECT provided a way to digitally collect oil and gas data from the field, transfer it quickly, accurately and securely via the Internet, and utilize it immediately to generate executive, operational and administrative reports.

Rochelle, J.

2001-09-30T23:59:59.000Z

266

Digital Gas Inc | Open Energy Information  

Open Energy Info (EERE)

Inc Inc Jump to: navigation, search Name Digital Gas Inc Place Dallas, Texas Sector Solar Product Company with a number of subsidiaries involved in mining, solar power, waste burning, energy saving, farming and electronics. Coordinates 32.778155°, -96.795404° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":32.778155,"lon":-96.795404,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

267

Analysis of a digital chirp synthesizer  

Science Conference Proceedings (OSTI)

Definite advantages are gained by using a chirp (linear-FM) waveform for radar pulse compression. Digital generation of this waveform provides programmability, predictability, and repeatability. Of the digital implementations considered, the digital chirp synthesizer is shown to have the most flexibility and is more readily miniaturized than the arbitrary waveform generator design. Elements and features of the digital chirp synthesizer are examined and design considerations are presented. A TTL breadboard circuit that was built demonstrates the soundness of the fundamental design of the digital chirp synthesizer concept. 10 refs., 18 figs., 10 tabs.

Allen, C.T.

1988-08-01T23:59:59.000Z

268

Digital RAC with a disturbance observer for underwater vehicle-manipulator systems  

Science Conference Proceedings (OSTI)

Most control methods of underwater vehiclemanipulator systems (UVMS) are based on the computed torque method that is used for underwater robotic vehicles. We have proposed a resolved acceleration control (RAC) method for UVMS. In this article, we propose ... Keywords: Digital control, Disturbance observer, Manipulator, Underwater robot

Shinichi Sagara; Takashi Yatoh; Tomoaki Shimozawa

2010-12-01T23:59:59.000Z

269

Direct Use of Solar Photovoltaic (PV) Energy  

Science Conference Proceedings (OSTI)

PV-DC refers to the direct use of photovoltaic (PV) energy in an appliance or other equipment without a grid connection. Most (over 90) of the new deployments of PV solar panels connect to the ac electric grid and do not use dc energy directly. These grid-connected PV systems use an electronic inverter to convert the dc array output to ac power for interfacing with the grid. However, with double-digit growth in all types of PV applications, the direct use of solar for powering end-use loads needs to be m...

2010-12-31T23:59:59.000Z

270

Automated User Modeling for Personalized Digital Libraries  

E-Print Network (OSTI)

Digital libraries (DL) have become one of the most typical ways of accessing any kind of digitalized information. Due to this key role, users welcome any improvements on the services they receive from digital libraries. One trend used to improve digital services is through personalization. Up to now, the most common approach for personalization in digital libraries has been user-driven. Nevertheless, the design of efficient personalized services has to be done, at least in part, in an automatic way. In this context, machine learning techniques automate the process of constructing user models. This paper proposes a new approach to construct digital libraries that satisfy user’s necessity for information: Adaptive Digital Libraries, libraries that automatically learn user preferences and goals and personalize their interaction using this information.

E. Frias-martinez; G. Magoulas; S. Chen; R. Macredie

2006-01-01T23:59:59.000Z

271

Digital Anthropology: Projects and Platforms  

E-Print Network (OSTI)

. Current plans include expanding the discussion boards and encouraging broad-scale participation, both inside and outside the discipline, where conversations are staged around pressing events, vexed disciplinary issues (ethnographic futures, digitality... social change in contemporary Nepal on the macro-level. Mark Turin is also involved in another worthy online effort, World Oral Literature Project – “An urgent global initiative to document and make accessible endangered oral literatures before...

Lende, Daniel

2011-11-28T23:59:59.000Z

272

PRESSURIZER ANALYSIS AND THE PRE DIGITAL PROGRAM  

SciTech Connect

An analysis is given which was programmed for the Philco 2000 (TRANSAC) Computer in order to provide a means for making pressurizer design and performance calculations. The analysis and digital program provide the exibility for studying the effects of various assumptions such as the type of steam compression process (i.e., isentropic or saturation), spray efficiency, wall condensation, and mixing of the pressurizer water and of the insurge. Also included in the program are data on pressure controlled steam and water relief,valves (total of four), pressure controlled heaters (total of five), pressure controlled spray valve, and various input formats allowing the use of either total surge, surge rate or bulk average temperature for the surge, spray fraction or spray rate for the spray and either temperatures or enthalpies for the surge and spray energies. The program uses steam and water properties in the form of empirical equations where the empirical constants in these equations may be changed depending upon the range of interest of the problem. (auth)

Findlay, J.A.

1961-07-14T23:59:59.000Z

273

The influence of oscillating electromagnetic fields on membrane structure and function: Synthetic liposome and natural membrane bilayer systems with direct application to the controlled delivery of chemical agents  

Science Conference Proceedings (OSTI)

Investigations have been conducted to determine if an imposed electromagnetic field can influence membrane transport, and ion and drug permeability in both synthetic and natural cell membrane systems. Microwave fields enhance accumulation of sodium in the lymphocyte and induce protein shedding at Tc. Microwaves also trigger membrane permeability of liposome systems under specific field exposure conditions. Sensitivity varies in a defined way in bilayers displaying a membrane structural phase transition temperature, Tc; maximal release was observed at or near Tc. Significantly, liposome systems without a membrane phase transition were also found to experience permeability increases but, in contrast, this response was temperature independent. The above results indicate that field-enhanced drug release occurs in liposome vesicles that possess a Tc as well as non-Tc liposomes. Additional studies extend non-Tc liposome responses to the in vivo case in which microwaves trigger Gentamicin release from a liposome depot'' placed subcutaneously in the rat hind leg. In addition, evidence is provided that cell surface sequestered liposomes can be triggered by microwave fields to release drugs directly into target cells. 24 refs., 6 figs.

Liburdy, R.P.; de Manincor, D.; Fingado, B.

1989-09-01T23:59:59.000Z

274

Handbook for Verification and Validation of Digital Systems  

Science Conference Proceedings (OSTI)

With the increasing use of digital instrumentation and control systems in power plants, utilities must determine the dependability and predictability of such systems and their software. This updated handbook provides a comprehensive guide to help utilities understand the verification and validation (V&V) process. The handbook presents a graded approach to select convenient V&V methods, develop a V&V plan, generate necessary documentation, and conduct appropriate V&V activities.

1998-12-15T23:59:59.000Z

275

Adaptive hybrid impedance control of robot manipulators: a comparative study  

Science Conference Proceedings (OSTI)

Keywords: direct adaptive control, hybrid impedance control, passivity-based adaptive control, robotics

Luís F. Baptista; José M. G. Sá da Costa

1997-01-01T23:59:59.000Z

276

Role for Distributed Energy Resources (DER) in the Digital Economy  

SciTech Connect

A large, and growing, part of the Nation's economy either serves or depends upon the information technology industry. These high-tech or "digital" enterprises are characterized by a dependence on electronic devices, need for completely reliable power supply, and intolerance to any power quality problems. In some cases these enterprises are densely populated with electronic loads and have very high energy usage per square foot. Serving these enterprises presents both electric power and equipment cooling challenges. Traditional electric utilities are often hard-pressed to deliver power that meets the stringent requirements of digital customers, and the economic and social consequences of a service quality or reliability problem can be large. New energy delivery and control options must be developed to effectively serve a digital economy. This report explores how distributed energy resources, partnerships between utility and customer to share the responsibility for service quality, innovative facility designs, higher energy efficiencies and waste-heat utilization can be coupled to meet the needs of a growing digital economy.

Key, Thomas S [Electric Power Research Institute (EPRI)

2007-11-01T23:59:59.000Z

277

Guideline for Performing Defense-in-Depth and Diversity Assessments for Digital Upgrades: Applying Risk-Informed and Deterministic M ethods  

Science Conference Proceedings (OSTI)

To continue meeting safety and reliability requirements while controlling operating costs, operators of nuclear power plants must be able to replace and upgrade equipment in a cost-effective manner. Instrumentation and control upgrades typically involve either replacement of analog devices with more modern digital technology or updating existing digital equipment. The use of digital technology raises the issue of potential software-related common-cause failure in multiple trains or systems that are safet...

2004-12-13T23:59:59.000Z

278

MyLibrary, A Personalization Service for Digital Library Environments  

E-Print Network (OSTI)

Several initiatives have offered personalized electronic services for digital library users. However, most of these services do not provide users with personalized shared Web environment, recommender system integration, Web link checking mechanism and tools that extend the functionality of Web browsers. MyLibrary at Los Alamos National Laboratory (LANL) provides digital library users (as individuals or groups) with a personalized Web environment while offering all these features. MyLibrary @LANL is the result of a project sponsored by LANL Research Library, which provides electronic services to LANL users (scientists, students, staff, external users, etc). This article explains the motivations for the design and development of the system, presents an overview of the MyLibrary @LANL initiative, summarizes MyLibrary's features, briefly discusses the technical solutions adopted, describes how the system is perceived by its users and addresses some of the directions for future developments of the product.

Mariella Di Giacomo; Dan Mahoney; Johan Bollen; Andres Monroy-Hernandez; Cesar M. Ruiz Meraz

2000-01-01T23:59:59.000Z

279

Lighting Group: Controls and Communications  

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

Communications Communications Controls and Communications The Controls and Communications research activity investigates how digital technologies, such as Bluetooth, can be applied to building lighting control systems to increase building efficiency and improve occupant comfort and productivity. Projects range from embedded device networks applied to building lighting systems, to WiFi and environmental sensing and monitoring. light switch Current Projects IBECS (Integrated Building Environmental Communications System) Wireless Lighting Controls (with DUST Networks) HPCBS Advanced Digital Controls Building Control Systems Integration Completed Projects CEC Public Interest Energy Research (PIER) Projects 450 Golden Gate Project New Publications Standardizing Communication Between Lighting Devices: A Role for

280

Stepping motor controller  

SciTech Connect

A stepping motor is microprocessingly controlled by digital circuitry which monitors the output of a shaft encoder adjustably secured to the stepping motor and generates a subsequent stepping pulse only after the preceding step has occurred and a fixed delay has expired. The fixed delay is variable on a real-time basis to provide for smooth and controlled deceleration.

Bourret, Steven C. (Los Alamos, NM); Swansen, James E. (Los Alamos, NM)

1984-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "direct digital controls" 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

Stepping motor controller  

DOE Patents (OSTI)

A stepping motor is microprocessor controlled by digital circuitry which monitors the output of a shaft encoder adjustably secured to the stepping motor and generates a subsequent stepping pulse only after the preceding step has occurred and a fixed delay has expired. The fixed delay is variable on a real-time basis to provide for smooth and controlled deceleration.

Bourret, S.C.; Swansen, J.E.

1982-07-02T23:59:59.000Z

282

Color spaces in digital video  

SciTech Connect

Whether it`s photography, computer graphics, publishing, or video; each medium has a defined color space, or gamut, which defines the extent that a given set of RGB colors can be mixed. When converting from one medium to another, an image must go through some form of conversion which maps colors into the destination color space. The conversion process isn`t always straight forward, easy, or reversible. In video, two common analog composite color spaces are Y`tjv (used in PAL) and Y`IQ (used in NTSC). These two color spaces have been around since the beginning of color television, and are primarily used in video transmission. Another analog scheme used in broadcast studios is Y`, R`-Y`, B`-Y` (used in Betacam and Mll) which is a component format. Y`, R`-Y`,B`-Y` maintains the color information of RGB but in less space. From this, the digital component video specification, ITU-Rec. 601-4 (formerly CCIR Rec. 601) was based. The color space for Rec. 601 is symbolized as Y`CbCr. Digital video formats such as DV, Dl, Digital-S, etc., use Rec. 601 to define their color gamut. Digital composite video (for D2 tape) is digitized analog Y`UV and is seeing decreased use. Because so much information is contained in video, segments of any significant length usually require some form of data compression. All of the above mentioned analog video formats are a means of reducing the bandwidth of RGB video. Video bulk storage devices, such as digital disk recorders, usually store frames in Y`CbCr format, even if no other compression method is used. Computer graphics and computer animations originate in RGB format because RGB must be used to calculate lighting and shadows. But storage of long animations in RGB format is usually cost prohibitive and a 30 frame-per-second data rate of uncompressed RGB is beyond most computers. By taking advantage of certain aspects of the human visual system, true color 24-bit RGB video images can be compressed with minimal loss of visual information. For example, humans `see` more white-to-black (luminance) detail then red, green, or blue color detail. Also, the eye is most sensitive to green colors. Taking advantage of this, both composite and component video allocates more bandwidth for the luma (Y`) signal than the chroma signals. Y`611 is composed of 59% green`, 30% red`, and 11% blue` (prime symbol denotes gamma corrected colors). This luma signal also maintains compatibility with black and white television receivers. Component digital video converts R`G`B` signals (either from a camera or a computer) to a monochromatic brightness signal Y` (referred here as luma to distinguish it from the CIE luminance linear- light quantity), and two color difference signals Cb and Cr. These last two are the blue and red signals with the luma component subtracted out. As you know, computer graphic images are composed of red, green, and blue elements defined in a linear color space. Color monitors do not display RGB linearly. A linear RGB color space image must be gamma corrected to be displayed properly on a CRT. Gamma correction, which is approximately a 0.45 power function, must also be employed before converting an RGB image to video color space. Gamma correction is defined for video in the international standard: ITU-Rec. BT.709-4. The gamma correction transform is the same for red, green, and blue. The color coding standard for component digital video and high definition video symbolizes gamma corrected luma by Y`, the blue difference signal by Cb (Cb = B` -Y`), and the red color difference signal by Cr (Cr = R` - Y`). Component analog HDTV uses Y`PbPr. To reduce conversion errors, clip in R`G`B`, not in Y`CbCr space. View video on a video monitor, computer monitor phosphors are wrong. Use a large word size (double precision) to avoid warp around, the0232n round the results to values between 0 and 255. And finally, recall that multiplying two 8- bit numbers results in a 16-bit number, so values need to be clipped to 8-bits.

Gaunt, R.

1997-05-01T23:59:59.000Z

283

Analysis of pulse-shape discrimination techniques for BC501A using GHz digital signal processing  

SciTech Connect

A comparison study of pulse-shape analysis techniques was conducted for a BC501A scintillator using digital signal processing (DSP). In this study, output signals from a preamplifier were input directly into a 1 GHz analog-to-digital converter. The digitized data obtained with this method was post-processed for both pulse-height and pulse-shape information. Several different analysis techniques were evaluated for neutron and gamma-ray pulse-shape discrimination. It was surprising that one of the simplest and fastest techniques resulted in some of the best pulse-shape discrimination results. This technique, referred to here as the Integral Ratio technique, was able to effectively process several thousand detector pulses per second. This paper presents the results and findings of this study for various pulse-shape analysis techniques with digitized detector signals.

Rooney, B. D. (Brian D.); Dinwiddie, D. R. (Derek R.); Nelson, M. A. (Mark A.); Rawool-Sullivan, Mohini W.

2001-01-01T23:59:59.000Z

284

NIST Releases Updates to Digital Signature Standard  

Science Conference Proceedings (OSTI)

... The National Institute of Standards and Technology (NIST) has released a revision to the digital standard used to ensure the integrity of electronic ...

2013-07-25T23:59:59.000Z

285

New Reference Standards for Digital Mammography  

Science Conference Proceedings (OSTI)

New Reference Standards for Digital Mammography. ... The NIST 100 kV tungsten anode x-ray unit and the Ritz primary standard free-air ionization ...

2013-03-13T23:59:59.000Z

286

Axial Tomography from Digitized Real Time Radiography  

DOE R&D Accomplishments (OSTI)

Axial tomography from digitized real time radiographs provides a useful tool for industrial radiography and tomography. The components of this system are: x-ray source, image intensifier, video camera, video line extractor and digitizer, data storage and reconstruction computers. With this system it is possible to view a two dimensional x-ray image in real time at each angle of rotation and select the tomography plane of interest by choosing which video line to digitize. The digitization of a video line requires less than a second making data acquisition relatively short. Further improvements on this system are planned and initial results are reported.

Zolnay, A. S.; McDonald, W. M.; Doupont, P. A.; McKinney, R. L.; Lee, M. M.

1985-01-18T23:59:59.000Z

287

Carbon NanoTube Digital Electronics Workshop  

Science Conference Proceedings (OSTI)

Carbon NanoTube Digital Electronics Workshop. Purpose: To review and discuss the current status and potential benefits of carbon nanotubes in ...

2012-08-29T23:59:59.000Z

288

Axial tomography from digitized real time radiography  

SciTech Connect

Axial tomography from digitized real time radiographs provides a useful tool for industrial radiography and tomography. The components of this system are: x-ray source, image intensifier, video camera, video line extractor and digitizer, data storage and reconstruction computers. With this system it is possible to view a two dimensional x-ray image in real time at each angle of rotation and select the tomography plane of interest by choosing which video line to digitize. The digitization of a video line requires less than a second making data acquisition relatively short. Further improvements on this system are planned and initial results are reported.

Zolnay, A.S.; McDonald, W.M.; Doupont, P.A.; McKinney, R.L.; Lee, M.M.

1985-01-18T23:59:59.000Z

289

Control system for an interior permanent magnet synchronous machine  

DOE Patents (OSTI)

A high performance, fully operational, four-quadrant control scheme is used in an interior permanent magnet synchronous machine. The machine operates smoothly with full performance in the constant-torque region as well as in the flux-weakening, constant-power region in both directions of motion. The transition between the constant-torque and constant-power regions is very smooth under all conditions of operation. Control in the constant-torque region is based on a vector or field-oriented technique, with the direct-axis aligned with the total stator flux, whereas constant-power region control is accomplished by orientation of the torque angle of the impressed square-wave voltage through the feedforward vector rotator. In a preferred embodiment, the control system employs a digital distributed microcomputer controller arrangement which relies upon various precisely estimated feedback signals, such as torque, flux, etc. The control scheme includes an outer torque control loop primarily for traction type applications, but also contemplates speed and position control loops for various industrial drives. A 70 hp drive system using a Neodymium-Iron-Boron permanent magnet machine and transistor pulse width modulating inverter has been designed and successfully tested. This control scheme also has application in controlling surface permanent magnet machines. 16 figs.

Bose, B.K.

1988-10-12T23:59:59.000Z

290

When Are Eddy Tracer Fluxes Directed Downgradient?  

Science Conference Proceedings (OSTI)

The mechanisms controlling the direction of eddy tracer fluxes are examined using eddy-resolving isopycnic experiments for a cyclic zonal channel. Eddy fluxes are directed downgradient on average when either (i) there is a Lagrangian increase in ...

Chris Wilson; Richard G. Williams

2006-02-01T23:59:59.000Z

291

New controllers aid substation automation  

SciTech Connect

Descriptions of and experience with Siemens voltage regulators, voltage regulator control panels, and digital meters used by two electric cooperatives are described. Magic Valley Electric Cooperative in Texas retrofitted substations to improve substation regulation control. 54 Siemens MJ-XTM voltage regulator control panels were installed, replacing load tap changer control units and single-stage voltage regulator control units. The Smoky Hill Electric Cooperative in Kansas installed Siemens 4700 digital meters and upgraded substation voltage regulators with Siemens JFR single-phase, step voltage regulators to address nightly overvoltage and summer peak demand problems.

Beaty, W.

1996-09-01T23:59:59.000Z

292

Salticus: Guided Crawling for Personal Digital Libraries  

E-Print Network (OSTI)

In this paper, we describe Salticus, a web crawler that learns from users' web browsing activity. Salticus enables users to build a personal digital library by collecting documents and generalizing over the user's choices. Keywords personal digital library, business intelligence, web crawling, document acquisition 1.

Robin Burke

2001-01-01T23:59:59.000Z

293

Salticus: guided crawling for personal digital libraries  

Science Conference Proceedings (OSTI)

In this paper, we describe Salticus, a web crawler that learns from us ers web browsing activity. Salticus enables users to build a personal digital library by collecting documents and generalizing over the user's choices. Keywords: business intelligence, crawling, document acquisition, personal digital library

Robin Burke

2001-01-01T23:59:59.000Z

294

MBD Driven Digital Product Collaborative Definition Technology  

Science Conference Proceedings (OSTI)

Recording and exchanging the collaborative product definition information is an important aspect of digital product collaborative development process. To resolve the problem of records the product collaborative definition information, promote the implementation ... Keywords: digital product definition, MBD, collaboration, product manufacturing information, integrated model

QiuZhong Zhou; QingChun Fan

2010-11-01T23:59:59.000Z

295

Light-weight communal digital libraries  

Science Conference Proceedings (OSTI)

We describe Kepler, a collection of light-weight utilities that allow for simple and quick digital library construction. Kepler bridges the gap between established, organization-backed digital libraries and groups of researchers that wish to publish ... Keywords: Documentation, Performance, Design

Kurt J. Maly; Michael L. Nelson; Mohammad Zubair; Ashraf Amrou; S. Kothasama; Lan Wang; Richard Luce

2004-06-01T23:59:59.000Z

296

A personalized recommender system for digital libraries  

Science Conference Proceedings (OSTI)

This paper presents the evaluation of a Recommender System for scientific articles in digital libraries. This system is geared towards the Computer Science scientific community. Technologically speaking, the proposed system was developed under the Semantic ... Keywords: digital library, recommender system, semantic web, user profile

Giseli Rabello Lopes; Maria Aparecida Martins Souto; Leandro Krug Wives; José Palazzo Moreira de Oliveira

2008-10-01T23:59:59.000Z

297

Reducing Unauthorized Modification of Digital Objects  

E-Print Network (OSTI)

-locking at the application package level (as is done in Android [11] ­ see §5.1), provides protection of such configuration Abstract--We consider the problem of malicious modification of digital objects. We present a protection mechanism designed to protect against unauthorized replacement or modification of digital objects while

Van Oorschot, Paul

298

Situating digital storytelling within African communities  

Science Conference Proceedings (OSTI)

We reflect on the methods, activities and perspectives we used to situate digital storytelling in two rural African communities in South Africa and Kenya. We demonstrate how in-depth ethnography in a village in the Eastern Cape of South Africa and a ... Keywords: Cross-cultural, Digital storytelling, ICT4D, Mobile devices, Oral knowledge, Rural

Thomas Reitmaier; Nicola J. Bidwell; Gary Marsden

2011-09-01T23:59:59.000Z

299

Perception and Digital Media in India  

Science Conference Proceedings (OSTI)

This essay analyzes the body politics at the center of both business services outsourcing labor also termed affective, immaterial, or communicative labor and the value-adding digital image in contemporary Indian media. The author uses a "media assemblage" ... Keywords: Affect, Digital Media, Electronic Commerce, India, Information Systems, Value Added

Amit S. Rai

2012-10-01T23:59:59.000Z

300

Older adults as digital content producers  

Science Conference Proceedings (OSTI)

Older adults are normally characterized as consumers, rather than producers, of digital content. Current research concerning the design of technologies for older adults typically focuses on providing access to digital resources. Access is important, ... Keywords: older adults, social connection, user-generated content

Jenny Waycott; Frank Vetere; Sonja Pedell; Lars Kulik; Elizabeth Ozanne; Alan Gruner; John Downs

2013-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "direct digital controls" 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

The Digital Revolution in Measurements  

Science Conference Proceedings (OSTI)

This paper considers what it means to make a measurement, and the changes in measurement technology over the years. The impact of the latest changes, which have resulted in most electrical measurements being done digitally, is explored. It is argued that the process of measurement can be considered equivalent to one of data compression. The smart grid will certainly result in many more signals being made available, and therefore a great deal of data compression will be taking place. Measurements will be made in parts of the power system presently unmonitored, as well as parts that are already well covered by instrumentation. The smart grid engineer must decide what it means to have “useful” information. Unless care is taken, the signal processing may furnish information that is not useful, and may not even make sense. The paper concludes by examining the possibilities of data compression from multiple separate signals.

Kirkham, Harold

2013-02-27T23:59:59.000Z

302

Method and apparatus for large motor control - Energy ...  

Apparatus and method for providing digital signal processing method for controlling the speed and phase of a motor involves inputting a reference signal having a ...

303

Federal Digital Strategy | Department of Energy  

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

Federal Digital Strategy Federal Digital Strategy Federal Digital Strategy New expectations require the Federal Government to be ready to deliver and receive digital information and services anytime, anywhere and on any device. It must do so safely, securely, and with fewer resources. To build for the future, the Federal Government has developed a Digital Strategy that embraces the opportunity to innovate more with less, and enables entrepreneurs to better leverage government data to improve the quality of services to the American people. The Energy Department has responded to this challenge through key initiatives that make high-value data sets available through API's that allow programmers to use data to reveal new opportunities and trends, websites that follow best practices for mobile design, and applications

304

Federal Digital Strategy | Department of Energy  

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

Federal Digital Strategy Federal Digital Strategy Federal Digital Strategy New expectations require the Federal Government to be ready to deliver and receive digital information and services anytime, anywhere and on any device. It must do so safely, securely, and with fewer resources. To build for the future, the Federal Government has developed a Digital Strategy that embraces the opportunity to innovate more with less, and enables entrepreneurs to better leverage government data to improve the quality of services to the American people. The Energy Department has responded to this challenge through key initiatives that make high-value data sets available through API's that allow programmers to use data to reveal new opportunities and trends, websites that follow best practices for mobile design, and applications

305

Requesting a Digital ID | Department of Energy  

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

Requesting a Digital ID Requesting a Digital ID Requesting a Digital ID Step One - Registering with MIS To request a DOE Digital Identity you must first register in DOE's Management Information System (MIS) by going to https://mis.doe.gov, selecting "Requesting Access" and following the onscreen instructions. Note: DOE Federal employees are already registered and do not need to complete this step, they may skip to step 2. During the registration process you will be required to search for, and select, a DOE sponsor. Your DOE sponsor is the DOE federal employee that is certifying that you have a recognized relationship with the Department and have a valid need for a DOE Digital Identity. For contractors this person is often your Contract Task Manager, Contracting Officer's Representatives

306

A Free Exchange e-Marketplace for Digital Services.  

E-Print Network (OSTI)

??The digital era is witnessing a remarkable evolution of digital services. While the prospects are countless, the e-marketplaces of digital services are encountering inherent game-theoretic… (more)

Ghonaim, Wafa M. I.

2013-01-01T23:59:59.000Z

307

Digial Technology Qualification Task 2 - Suitability of Digital Alternatives to Analog Sensors and Actuators  

SciTech Connect

The next generation reactors in the U.S. are an opportunity for vendors to build new reactor technology with advanced Instrumentation and Control Systems (control rooms, DCS, etc.). The advances made in the development of many current generation operating reactors in other parts of the world are being used in the design and construction of new plants. These new plants are expected to have fully integrated digital control rooms, computerized procedures, integrated surveillance testing with on-line monitoring and a major effort toward improving the O&M and fault survivability of the overall systems. In addition the designs are also incorporating major improvements in the man-machine interface based on lessons learned in nuclear and other industries. The above relates primarily to the scope of supply in instrumentation and control systems addressed by Chapter 7 of the Standard Review Plan (SRP) NUREG-0800 (Reference 9.5), and the associated Balance of Plant (BOP) I&C systems. This does not relate directly to the actuator and motor, breaker, initiation circuitry, valve position, etc. which is the subject of this report and normally outside of the traditional Distributed Control System (DCS), for both safety and non-safety systems. The recommendations presented in this report will be used as input to I&C research programming for the implementation of lessons learned during the early phases of new build both for large light water reactors (LWR) and also small modular reactors (SMR). This report is intended to support current research plans and provide user (vendor, owner-operator) input to the optimization of these research plans.

Ted Quinn; Jerry Mauck

2012-09-01T23:59:59.000Z

308

Superconducting VAR control  

DOE Patents (OSTI)

Static VAR control means employing an asymmetrically controlled Graetz bridge and a superconducting direct current coil having low losses and low cost characteristics.

Boenig, Heinrich J. (Los Alamos, NM); Hassenzahl, William V. (Piedmont, CA)

1982-01-01T23:59:59.000Z

309

The UCONABC usage control model  

Science Conference Proceedings (OSTI)

In this paper, we introduce the family of UCONABC models for usage control (UCON), which integrate Authorizations (A), oBligations (B), and Conditions (C). We call these core models because they address the essence of UCON, leaving ... Keywords: access control, digital rights management, privacy, trust, usage control

Jaehong Park; Ravi Sandhu

2004-02-01T23:59:59.000Z

310

A low-power digital matched filter for spread-spectrum systems  

Science Conference Proceedings (OSTI)

A Digital Matched Filter (DMF) is an essential device for Direct-Sequence Spread-Spectrum (DS-SS) communication systems. Reducing the power consumption of a DMF is especially critical for battery-powered terminals. The reception registers and the correlation-calculating ... Keywords: CDMA, VLSI, low power, matched filter, spread-spectrum

Shoji Goto; Takashi Yamada; Norihisa Takayama; Yoshifumi Matsushita; Yasoo Harada; Hiroto Yasuura

2002-08-01T23:59:59.000Z

311

Worldwide digital divide: influences of education, workforce, economic, and policy factors on information technology  

Science Conference Proceedings (OSTI)

The research goal is to analyze the influence of education, workforce, economic, and policy factors on ICT usage, expenditure, and infrastructure in 67 countries. Findings indicate importance of R&D capacity, foreign direct investment, government prioritization ... Keywords: IT workforce, R&D, digital divide, education, global, information technology, policy, socioeconomic

James B. Pick; Rasool Azari

2007-04-01T23:59:59.000Z

312

Closed orbit feedback with digital signal processing  

SciTech Connect

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

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

1994-08-01T23:59:59.000Z

313

CMOS-compatible InP/InGaAs digital photoreceiver  

DOE Patents (OSTI)

A digital photoreceiver is formed monolithically on an InP semiconductor substrate and comprises a p-i-n photodetector formed from a plurality of InP/InGaAs layers deposited by an epitaxial growth process and an adjacent heterojunction bipolar transistor (HBT) amplifier formed from the same InP/InGaAs layers. The photoreceiver amplifier operates in a large-signal mode to convert a detected photocurrent signal into an amplified output capable of directly driving integrated circuits such as CMOS. In combination with an optical transmitter, the photoreceiver may be used to establish a short-range channel of digital optical communications between integrated circuits with applications to multi-chip modules (MCMs). The photoreceiver may also be used with fiber optic coupling for establishing longer-range digital communications (i.e. optical interconnects) between distributed computers or the like. Arrays of digital photoreceivers may be formed on a common substrate for establishing a plurality of channels of digital optical communication, with each photoreceiver being spaced by less than about 1 mm and consuming less than about 20 mW of power, and preferably less than about 10 mW. Such photoreceiver arrays are useful for transferring huge amounts of digital data between integrated circuits at bit rates of up to about 1000 Mb/s or more.

Lovejoy, Michael L. (Albuquerque, NM); Rose, Benny H. (Albuquerque, NM); Craft, David C. (Albuquerque, NM); Enquist, Paul M. (Cary, NC); Slater, Jr., David B. (Raleigh, NC)

1997-01-01T23:59:59.000Z

314

e-Infrastructure and Digital Preservation: Challenges and Outlook  

E-Print Network (OSTI)

long- term preservation infrastructure adapted to the needsCalifornia e-Infrastructure and Digital Preservation:digital preservation infrastructure. Up to now, the existing

Altenhöner, Reinhard

2009-01-01T23:59:59.000Z

315

Research Library teams shares 2010 Digital Preservation Award  

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

2010 Digital Preservation Award Research Library teams shares 2010 Digital Preservation Award Winning for their development of Memento-a unique computer architecture that uses a...

316

Design of a step-down DC-DC controller integrated circuit with adaptive dead-time control  

E-Print Network (OSTI)

A constant-frequency peak current mode synchronous step-down DC-DC controller integrated circuit has been designed with adaptive dead-time control. The adaptive dead-time control circuitry is implemented as digital ...

Li, Zhipeng, M. Eng. Massachusetts Institute of Technology

2010-01-01T23:59:59.000Z

317

EU Metric Directive  

Science Conference Proceedings (OSTI)

... View EU Metric Directive Commission Services Working Document PDF ... of European Union (EU) Meeting on Metric Directives (2005); Packaging ...

2012-12-13T23:59:59.000Z

318

u-DRM: A Unified Framework of Digital Rights Management based on RFID and Application of Its Usage Data Summary  

E-Print Network (OSTI)

In the Internet, the digital format of most contents has led to its increased piracy because of the ease of copying and sharing the digital contents. Moreover, the advent of new technologies such as ubiquitous computing seems to cause problems of piracy even more than before. Likewise it’s going to be a more critical issue to control and manage rights of digital contents in the future. Therefore, in this paper, we propose a framework of u-DRM: a unified framework of DRM based on RIFD with watermarking and fingerprinting. The framework consists of two methods using digital mediums and digital contents. And we suggest ways for the application of usage data collected from the proposed framework of u-DRM. Key words:

Jong Hwan Suh; Sang Chan Park

2006-01-01T23:59:59.000Z

319

Digital electronic bone growth stimulator  

DOE Patents (OSTI)

The present invention relates to the electrical treatment of biological tissue. In particular, the present invention discloses a device that produces discrete electrical pulse trains for treating osteoporosis and accelerating bone growth. According to its major aspects and broadly stated, the present invention consists of an electrical circuit configuration capable of generating Bassett-type waveforms shown with alternative signals provide for the treatment of either fractured bones or osteoporosis. The signal generator comprises a quartz clock, an oscillator circuit, a binary divider chain, and a plurality of simple, digital logic gates. Signals are delivered efficiently, with little or no distortion, and uniformly distributed throughout the area of injury. Perferably, power is furnished by widely available and inexpensive radio batteries, needing replacement only once in several days. The present invention can be affixed to a medical cast without a great increase in either weight or bulk. Also, the disclosed stimulator can be used to treat osteoporosis or to strengthen a healing bone after the cast has been removed by attaching the device to the patient`s skin or clothing.

Kronberg, J.W.

1993-01-01T23:59:59.000Z

320

Model-Based Troubleshooting of Digital Systems  

E-Print Network (OSTI)

This thesis describes a methodology, a representation, and an implemented program for troubleshooting digital circuit boards at roughly the level of expertise one might expect in a human novice. Existing methods for ...

Hamscher, Walter Charles

1988-08-01T23:59:59.000Z

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


321

Browsing and visualizing digital bibliographic data  

Science Conference Proceedings (OSTI)

Access to publications is provided by conventional libraries, digital libraries operated by learned societies or commercial publishers, and a huge number of web sites maintained by the scientists themselves or their institutions. But comprehensive meta-indices ...

Stefan Klink; Michael Ley; Emma Rabbidge; Patrick Reuther; Bernd Walter; Alexander Weber

2004-05-01T23:59:59.000Z

322

Materials Sustainability: Digital Resource Center -- Recycling - Steel  

Science Conference Proceedings (OSTI)

Use this area to submit digital resources and/or make comments on the resources posted by others. DO NOT use this area of the site to initiate discussion  ...

323

Finding related papers in literature digital libraries  

Science Conference Proceedings (OSTI)

This paper is about searching literature digital libraries to find "related" publications of a given publication. Existing approaches do not take into account publication topics in the relatedness computation, allowing topic diffusion across query output ...

Nattakarn Ratprasartporn; Gultekin Ozsoyoglu

2007-09-01T23:59:59.000Z

324

Materials Sustainability: Digital Resource Center -- Recycling ...  

Science Conference Proceedings (OSTI)

Use this area to submit digital resources and/or make comments on the resources posted by others. DO NOT use this area of the site to initiate discussion  ...

325

Radio frequency digital to analog converter  

E-Print Network (OSTI)

Dynamic performance of high speed, high resolution digital-to-analog converters (DACs) is limited by distortion at the data switching instants. Inter-symbol interference (ISI), imperfect timing synchronization and clock ...

Luschas, Susan, 1975-

2003-01-01T23:59:59.000Z

326

Advanced Digital Microscopy is Revolutionizing Failure Analysis  

Science Conference Proceedings (OSTI)

A variety of lighting options, like the High Dynamic Range (HDR) function, make digital microscopes ideal systems for imaging low-contrast and reflective targets. ... Incipient SCC Damage in Primary Loop Piping Using Fiber Optic Strain Gages.

327

SIP : a smart digital image processing library  

E-Print Network (OSTI)

The Smart Image Processing (SIP) library was developed to provide automated real-time digital image processing functions on camera phones with integer microprocessors. Many of the functions are not available on commercial ...

Zhou, Mengyao

2005-01-01T23:59:59.000Z

328

Buckets: Smart Objects for Digital Libraries  

Science Conference Proceedings (OSTI)

Current discussion of digital libraries (DLs) is often dominated by the merits of the respective storage, search and retrieval functionality of archives, repositories, search engines, search interfaces and database systems. While these technologies are ...

Nelson Michael L.

2001-08-01T23:59:59.000Z

329

Digital fabrication in the architectural design process  

E-Print Network (OSTI)

Digital fabrication is affecting the architectural design process due to the increasingly important role it has in the fabrication of architectural models. Many design professionals, professors, and students have experienced ...

Seely, Jennifer C. K., 1975-

2004-01-01T23:59:59.000Z

330

Applying digital library technologies to nuclear forensics  

Science Conference Proceedings (OSTI)

Digital Libraries will enhance the value of forensic endeavors if they provide tools that enable data mining capabilities. In fact, collecting data without such tools can result in investigators becoming overwhelmed. Currently, the quantity of highly ...

Electra Sutton; Chloe Reynolds; Fredric C. Gey; Ray R. Larson

2012-09-01T23:59:59.000Z

331

Defining digital space through a visual language  

E-Print Network (OSTI)

Current approaches toward digital spaces mainly mimic the physical space that surrounds us. While this approach is valid in a wide range of applications and research, the goal of this thesis is to propose an alternative ...

Kilian, Axel, 1971-

2000-01-01T23:59:59.000Z

332

Digital Libraries and Document Image Analysis  

Science Conference Proceedings (OSTI)

The rapid growth of digital libraries (DLs) worldwideposes many new challenges for document image analysis(DIA) research and development. DLs promise to offermore people access to larger document collections, and atfar greater speed, than physical libraries ...

Henry S. Baird

2003-08-01T23:59:59.000Z

333

Integrated optical analog-to-digital converter  

E-Print Network (OSTI)

An optically-sampled frequency-demultiplexed wideband analog-to-digital converter (ADC) which has potential to exceed the performance of electronic ADCs by orders of magnitude is studied analytically and numerically. The ...

Khilo, Anatol

2008-01-01T23:59:59.000Z

334

An investigation of the role of digital libraries in bridging the digital divide in developing Arab countries: the case of Yarmouk University, Jordan.  

E-Print Network (OSTI)

??Developing countries are often said to suffer the disadvantages created by a ‘digital divide’ – the gap between the digitally advantaged and the digitally disadvantaged.… (more)

Obeidat, Othman

2009-01-01T23:59:59.000Z

335

Digital Bangladesh: a change we can believe in?  

Science Conference Proceedings (OSTI)

Turning Bangladesh, one of the world's least developed countries, into a digitally developed nation by 2021 was one of the main electoral pledges of the present government. This vision, widely known as 'Digital Bangladesh', has contributed to a decisive ... Keywords: ICTs, digital access model, digital bangladesh, national ICT policy 2009

M. Sirajul Islam; Åke Grönlund

2011-08-01T23:59:59.000Z

336

Revealing your hand: caveats in implementing digital business strategy  

Science Conference Proceedings (OSTI)

Digital business strategies (DBS) offer significant opportunities for firms to enhance competitiveness. Unlike the large proprietary systems of the 1980s, today's "micro-applications" allow firms to create and reconfigure digital capabilities to appropriate ... Keywords: competitiveness, design, digital business strategy, digitization, flexibility, phasing

Varun Grover, Rajiv Kohli

2013-06-01T23:59:59.000Z

337

Co-authorship networks in the digital library research community  

Science Conference Proceedings (OSTI)

The field of digital libraries (DLs) coalesced in 1994: the first digital library conferences were held that year, awareness of the World Wide Web was accelerating, and the National Science Foundation awarded $24 Million (US) for the Digital Library ... Keywords: AuthorRank, Co-authorship, Digital library, Social network analysis

Xiaoming Liu; Johan Bollen; Michael L. Nelson; Herbert Van de Sompel

2005-12-01T23:59:59.000Z

338

Co-authorship networks in the digital library research community  

Science Conference Proceedings (OSTI)

The field of digital libraries (DLs) coalesced in 1994: the first digital library conferences were held that year, awareness of the World Wide Web was accelerating, and the National Science Foundation awarded $24 Million (US) for the Digital Library ... Keywords: authorrank, co-authorship, digital library, social network analysis

Xiaoming Liu; Johan Bollen; Michael L. Nelson; Herbert Van de Sompel

2005-12-01T23:59:59.000Z

339

An ecologically inspired simulation tool for managing digital ecosystems  

Science Conference Proceedings (OSTI)

In this paper we present an ecologically inspired multi-agent based simulation tool for finding and analysing networks of collaborations in a digital ecosystem. Digital ecosystems are defined as open, self-organising environments inside which digital ... Keywords: collaboration, complex networks, digital ecosystems, ecology, multi-agent systems, mutualism

Miguel Lurgi

2010-10-01T23:59:59.000Z

340

Toward Digital Ecologies:Intelligent Agent Networks Controlling Interdependent Infrastructures  

E-Print Network (OSTI)

Valeriy Vyatkin, Gulnara Zhabelova Department of Electrical and Computer Engineering, The University producers and consumers (prosumers). The advanced ICT will incorporate into the grid "the benefits

Ulieru, Mihaela

Note: This page contains sample records for the topic "direct digital controls" 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

Toward Digital Ecologies:Intelligent Agent Networks Controlling Interdependent Infrastructures  

E-Print Network (OSTI)

of Communication Architecture and Solutions for Linking the Elements of the Smart Distribution Grid By Sumit RoyV white space" for this purpose. Architectural Considerations for an Integrated Smart Distribution Grid will occur at the distribution level, in terms of making the grid "smart." these future "smart grids

Ulieru, Mihaela

342

Evolution of the Bimodal Directional Distribution of Ocean Waves  

Science Conference Proceedings (OSTI)

Recent results of numerical wave models have shown that the presence of a bimodal directional spreading is a robust feature at wavenumbers above the spectral peak. This directional bimodality is controlled mainly by directional transfer of energy ...

David W. Wang; Paul A. Hwang

2001-05-01T23:59:59.000Z

343

Cyber Security Recommendations for Digital I&C Systems Within Power Generation Facilities Unregulated by North American Electric Rel iability Corporation Critical Infrastructure Protection  

Science Conference Proceedings (OSTI)

Fossil generating facilities represent a significant investment, as well as a primary source of revenue, for many electric utilities. The digital instrumentation and control (I&C) systems of these generation facilities are essential to their successful operations. As such, the security of digital I&C systems is fundamental to ensure continued, reliable production. It is therefore prudent to employ appropriate ...

2012-12-12T23:59:59.000Z

344

Guideline on Licensing Digital Upgrades - TR-102348 Revision 1 - NEI 01-01: A Revision of EPRI TR-102348 to Reflect Changes to the 10 CFR 50.59 Rule  

Science Conference Proceedings (OSTI)

To continue meeting safety and reliability requirements while controlling operating costs, operators of nuclear power plants must be able to replace and upgrade equipment in a cost-effective manner. Upgrades to plant equipment and especially instrumentation and control (I&C) systems typically involve either replacement of analog devices with more modern digital technology or updating existing digital equipment. However, the use of digital technology has raised new design and licensing issues. This guide ...

2002-03-08T23:59:59.000Z

345

Things to Consider When Upgrading a Non-Power Reactor to a Digital I&C System  

SciTech Connect

Non-Power Reactor (NPR) licensees are increasing their use of state-of-the-art digital technology in instrumentation and control (I&C) systems because digital systems offer improved reactor control, information processing, and information storage. In Generic Letter GL 95-02, the NRC recognized that the design characteristics specific to the new digital electronics could result in failure modes and system malfunctions that either were not considered during the initial plant design or not evaluated in sufficient detail in the safety analysis report. These concerns include potential common mode failures. A conversion from analog to digital I&C systems in NPRs solves some problems while potentially introducing others. Good design, engineering, review, and testing can identify and minimize these risks.

Muhlheim, Michael David [ORNL; Hardin, LeRoy A [U.S. Nuclear Regulatory Commission; Hardesty, Duane [U.S. Nuclear Regulatory Commission; Wilson, Thomas L [ORNL

2011-01-01T23:59:59.000Z

346

Hormone-Inspired Self-Organization and Distributed Control of Robotic Swarms  

Science Conference Proceedings (OSTI)

The control of robot swarming in a distributed manner is a difficult problem because global behaviors must emerge as a result of many local actions. This paper uses a bio-inspired control method called the Digital Hormone Model (DHM) to control the tasking ... Keywords: Digital Hormones, distributed control, modular robots, robot swarms, self organization, self reconfiguration

Wei-Min Shen; Peter Will; Aram Galstyan; Cheng-Ming Chuong

2004-07-01T23:59:59.000Z

347

Sunlight Direct | Open Energy Information  

Open Energy Info (EERE)

Direct Direct Jump to: navigation, search Name Sunlight Direct Place San Diego, California Zip 92128 Sector Solar Product Developed a system that tracks and concentrates solar energy for distributed power generation Website http://www.sunlight-direct.com Coordinates 33.0013938°, -117.0735241° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":33.0013938,"lon":-117.0735241,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

348

Image Quality and Radiation Dose Assessment of a Digital Mammography System  

Science Conference Proceedings (OSTI)

Image quality and radiation dose of a direct amorphous selenium digital mammography system were considered in terms of contrast to noise ratio (CNR) and average glandular dose (AGD). They were measured for various qualities and breast phantom thicknesses with different types of breast tissue composition to determine optimal radiation quality and dose. Three sets of breast tissue equivalent slabs (30%:70%, 50%:50% and 70%:30% glandular-adipose) with thickness of 2 cm to 7 cm and 0.2 mm aluminum foil were used to provide certain CNR. Two different combinations of anode/ilter material and a wide range of tube voltages were employed for each phantom thickness. Phantom images with grid were acquired using automatic exposure control (AEC) mode for each thickness. Phantom images without grid were also obtained in manual exposure mode by selecting the same anode/filter combination and kVp as the image obtained with grid at the same thickness, but varying mAs of 10 to 200 mAs. Optimization indicated that relatively high energy beam qualities should be used with a greater dose to compensate for lower energy x-rays. The results also indicate that current AEC setting for a fixed detector is not optimal.

Isa, N. M.; Hassan, W. M. S. W. [Department of Physics, Universiti Teknologi Malaysia, 81310 Skudai, Johor (Malaysia); Abdullah, W. A. K. W. [Department of Radiology, Hospital USM, 16150 Kubang Kerian, Kelantan (Malaysia); Othman, F. [Department of Diagnostic Imaging, Hospital Putrajaya, Pres, 62250 Putrajaya, Walayah Persekutuan (Malaysia); Ramli, A. A. M. [Malaysian Nuclear Agency, 43000 Kajang, Selangor (Malaysia)

2010-07-07T23:59:59.000Z

349

Digital Architecture for Driving Large LED Arrays with Dynamic Bus Voltage Regulation and Phase Shifted PWM  

E-Print Network (OSTI)

. Y. Tsao, "Light Emitting Diodes (LEDs) fi OIDA Technology Roadmap Update 2002 Development/Graphics/00038951_0.pdf ~d system efficiency at [16] E. F. Schubert, Light-Emitting Diodes, 2nd Edition, Cambridge, "Development of High Power Green digital control driving Light Emitting Diode Chips", MRS Internet Journal

350

Principles Governing Departmental Directives  

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

ELEMENTS FROM: SAMUEL W. BODMA 4 SUBJECT: Principles Governing Departmental Directives The Department of Energy uses directives as its primary means to establish,...

351

directed acyclic word graph  

Science Conference Proceedings (OSTI)

... and R. Verin, Direct Construction of Compact Directed Acyclic Word Graphs, 8th Annual Symposium, CPM 97, Aarhus, Denmark, 116-129, 1997. ...

2013-08-23T23:59:59.000Z

352

Digital artifacts as legacy: exploring the lifespan and value of digital data  

Science Conference Proceedings (OSTI)

Legacy is the meaningful and complex way in which information, values, and possessions are passed on to others. As digital systems and information become meaningfully parts of people's everyday and social relationships, it is essential to develop new ... Keywords: design, digital artifacts, inheritance, interviews, legacy, reflective design, speculative design, technology probes

Rebecca Gulotta; William Odom; Jodi Forlizzi; Haakon Faste

2013-04-01T23:59:59.000Z

353

Industrial Boiler Optimization Utilizing CO Control  

E-Print Network (OSTI)

Escalating energy costs have caused industry to search the technical section for the current state-of-the-art in combustion and control technology for power generation. Long a forgotten area in many industrial facilities, today the steam generating complex is the focus of many corporate and plant managers. This paper discusses the approach of a large chemical company that is effectively utilizing a direct digital control (DOC) system coupled with the measurement of carbon monoxide to optimize boiler combustion and generate steam in the most cost effective manner. Significant reductions in the amount of excess air have resulted from the use of CO as a control parameter. Previously, combustion effectiveness was determined by the more typical 02 measurement. For reasons of boiler leakage and gas stratification, this control technique was not suitable when operating close to stoichiometry. The use of DOC type control in our multiple boiler installation has also enabled the intelligent allocation of boiler capacity by evaluating steam demand versus incremental boiler steam cost. The system selectively increases or decreases boiler loads within specified constraints to provide the lowest overall steam production cost while continuing to meet the steam demand.

Ruoff, C. W.; Reiter, R. E.

1980-01-01T23:59:59.000Z

354

NRC Regulatory Issue Summary on EPRI Digital Licensing Guideline, TR-102348 (NEI 01-01)  

Science Conference Proceedings (OSTI)

The U.S. Nuclear Regulatory Commission (NRC) issued this regulatory issue summary (RIS) to announce that the NRC has reviewed the EPRI / Nuclear Energy Institute (NEI) Joint Task Force Report entitled "Guideline on Licensing Digital Upgrades: EPRI TR-102348, Revision 1, NEI 01-01: A Revision of EPRI TR-102348 To Reflect Changes to the 10 CFR 50.59 Rule," and has endorsed the report for use as guidance in designing and implementing digital upgrades to instrumentation and control systems. The attached safe...

2004-01-16T23:59:59.000Z

355

A digital optical phase-locked loop for diode lasers based on field programmable gate array  

Science Conference Proceedings (OSTI)

We have designed and implemented a highly digital optical phase-locked loop (OPLL) for diode lasers in atom interferometry. The three parts of controlling circuit in this OPLL, including phase and frequency detector (PFD), loop filter and proportional integral derivative (PID) controller, are implemented in a single field programmable gate array chip. A structure type compatible with the model MAX9382/MCH12140 is chosen for PFD and pipeline and parallelism technology have been adapted in PID controller. Especially, high speed clock and twisted ring counter have been integrated in the most crucial part, the loop filter. This OPLL has the narrow beat note line width below 1 Hz, residual mean-square phase error of 0.14 rad{sup 2} and transition time of 100 {mu}s under 10 MHz frequency step. A main innovation of this design is the completely digitalization of the whole controlling circuit in OPLL for diode lasers.

Xu Zhouxiang; Zhang Xian; Huang Kaikai; Lu Xuanhui [Physics Department, Zhejiang University, Hangzhou, 310027 (China)

2012-09-15T23:59:59.000Z

356

Direct process for explosives  

SciTech Connect

A direct process of making ethylenediamine dinitrate through the reaction of ethylenediamine and ammonium nitrate.

Akst, Irving B. (1032 Duncan St., Pampa, TX 79065); Stinecipher, Mary M. (324 Connie St., Los Alamos, NM 87544)

1982-01-01T23:59:59.000Z

357

Summary of electric vehicle dc motor-controller tests  

DOE Green Energy (OSTI)

Available performance data for production motors are usually of marginal value to the electric vehicle designer. To provide at least a partial remedy to this situation, tests of typical dc propulsion motors and controllers were conducted as part of the DOE Electric Vehicle Program. The objectives of this program were to evaluate the differences in the performance of dc motors when operating with chopper-type controllers and when operating on direct current; and to gain an understanding of the interactions between the motor and the controller which cause these differences. Toward this end, motor-controller tests performed by the NASA Lewis Research Center provided some of the first published data that quantified motor efficiency variations for both ripple-free (straight dc) and chopper modes of operation. Test and analysis work at the University of Pittsburgh explored motor-controller relationships in greater depth. And to provide additional data, 3E Vehicles tested two small motors, both on a dynamometer and in a vehicle, and the Eaton Corporation tested larger motors, using sophisticated instrumentation and digital processing techniques. All the motors tested were direct-current types. Of the separately excited types, seven were series wound and two were shunt wound. One self-excited permanent magnet type was also tested. Four of the series wound motors used brush shifting to obtain good commutation. In almost all cases, controller limitations constrained the test envelope so that the full capability of the motors could not be explored.

McBrien, E F; Tryon, H B

1982-09-01T23:59:59.000Z

358

Digitally programmable signal generator and method  

DOE Patents (OSTI)

A digitally programmable waveform generator for generating completely arbitrary digital or analog waveforms from very low frequencies to frequencies in the gigasample per second range. A memory array with multiple parallel outputs is addressed; then the parallel output data is latched into buffer storage from which it is serially multiplexed out at a data rate many times faster than the access time of the memory array itself. While data is being multiplexed out serially, the memory array is accessed with the next required address and presents its data to the buffer storage before the serial multiplexing of the last group of data is completed, allowing this new data to then be latched into the buffer storage for smooth continuous serial data output. In a preferred implementation, a plurality of these serial data outputs are paralleled to form the input to a digital to analog converter, providing a programmable analog output.

Priatko, Gordon J. (Oakland, CA); Kaskey, Jeffrey A. (San Leandro, CA)

1989-01-01T23:59:59.000Z

359

Archives and History Office: Digital Resources  

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

Resources > Digital Resources Resources > Digital Resources Digital Resources Informal History, Part 1 The Histories page provides publications that examine SLAC history or particular events, experiments, and equipment. Publications are listed in reverse chronological order (i.e. newest listed first). Edward L. Ginzton and the MARK III accelerator at Stanford University as it nears its completion in 1952. Copies of Stanford University Physics Department Project M Reports held by the SLAC Archives and History Office, including those produced by the Microwave Lab, and the High-Energy Physics Lab (HEPL) have been scanned and are now available online. Linac construction site showing curved and straight sections in rain and mud, 1963. Copies of ABA reports held by the SLAC Archives have been scanned and are now available online along with a list of ABA numbered reports relating to the development of the SLAC proposal and known to the SLAC Archives and History Office.

360

Computer Control of a Syngas Complex at LaPorte, Texas  

E-Print Network (OSTI)

Air Products and Chemicals has successfully implemented a mini-computer monitoring and control system at its LaPorte Syngas Complex as an integral part of its energy management strategy. The production complex consists of two separate plants at LaPorte, producing hydrogen and carbon monoxide, and a hydrogen producing plant at Battleground, six miles away. The combined facilities have a capacity of over 8 MMSCF/D of carbon monoxide and over 34 MMSCF/D of hydrogen product. The products are supplied to approximately fifteen customers via a pipeline system. The overall complexity of the multi-plant facility necessitated the implementation of a computerized control system to achieve maximum energy efficiency. The paper describes a computer system based upon a DEC PDP 11-34 mini-computer with a software package developed specifically for Air Products' application. The monitoring, direct digital control, and optimization strategy which was developed and written by Air Products personnel is reviewed. More than 250 process signals are measured and plant and equipment performance are calculated on-line for continuous logging, alarming and operator reference. In order to obtain 'rock steady' operation, over forty loops are under direct digital control and all- product ion changes are implemented on a feed forward basis. The total installed cost of the system was $950,000 and savings in excess of $750,000 have been achieved in the first year of operation in energy consumption improvement alone.

Chatterjee, N.

1981-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "direct digital controls" 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

Foreign Direct Investment  

Gasoline and Diesel Fuel Update (EIA)

Investment Investment Foreign Direct Investment Foreign Direct Investment Foreign Direct Investment in U.S. Energy in U.S. Energy in U.S. Energy in U.S. Energy in 1999 in 1999 in 1999 in 1999 June 2001 ii iii Contents Foreign Affiliates' Role in U.S. Energy Industry Operations ..............................................................................1 Foreign Direct Investment: The International Transactions Accounts ..............................................................8 U.S. Companies' Direct Investment Abroad in Energy ......................................................................................14 Conclusion...............................................................................................................................................................19

362

Institutional Controls  

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

Institutional Controls Institutional Controls Many major Federal laws (e.g., Atomic Energy Act (AEA), Resource Conservation Recovery Act (RCRA), Comprehensive Environmental Response, Compensation and Liability Act (CERCLA)), Executive Orders, regulations and various other drivers influence the use of institutional controls at DOE sites. Some drivers directly authorize or require the use of institutional controls, while others do not. DOE also uses institutional controls when no specific statutory requirement exists to supplement active remediation, pollution control, public and resource protection, and physical security, or to bolster the integrity of engineered remedies. DOE and its predecessor agencies have conducted activities for over 50 years, using land ownership and access control, environmental monitoring and surveillance, and other tools to support protection efforts at operational and inactive facilities, including radioactive waste burial grounds.

363

Broadband accelerator control network  

SciTech Connect

A broadband data communications network has been implemented at BNL for control of the Alternating Gradient Synchrotron (AG) proton accelerator, using commercial CATV hardware, dual coaxial cables as the communications medium, and spanning 2.0 km. A 4 MHz bandwidth Digital Control channel using CSMA-CA protocol is provided for digital data transmission, with 8 access nodes available over the length of the RELWAY. Each node consists of an rf modem and a microprocessor-based store-and-forward message handler which interfaces the RELWAY to a branch line implemented in GPIB. A gateway to the RELWAY control channel for the (preexisting) AGS Computerized Accelerator Operating system has been constructed using an LSI-11/23 microprocessor as a device in a GPIB branch line. A multilayer communications protocol has been defined for the Digital Control Channel, based on the ISO Open Systems Interconnect layered model, and a RELWAY Device Language defined as the required universal language for device control on this channel.

Skelly, J.; Clifford, T.; Frankel, R.

1983-01-01T23:59:59.000Z

364

Digital Television and Media Innovations | Princeton Plasma Physics Lab  

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

8, 2007, 4:15pm to 5:15pm 8, 2007, 4:15pm to 5:15pm Colloquia MBG Auditorium Digital Television and Media Innovations Dr. Michael A. Isnardi Sarnoff Corporation Colloquium Committee: The Princeton Plasma Physics Laboratory 2013-2014 Colloquium Committee is comprised of the following people. Please feel free to contact them by e-mail regarding any possible speakers or topics for future colloquia. Carol Ann Austin caustin@pppl.gov John Greenwald, Chair jgreenwa@pppl.gov Charles H. Skinner cskinner@pppl.gov Daren Stotler dstotler@pppl.gov Carol Ann Austin 609-243-2484 PPPL Entrance Procedures Visitor Information, Directions, Security at PPPL As a federal facility, the Princeton Plasma Physics Laboratory is operating under heightened security measures because of the events of September 11,

365

A new aspect in robust digital watermarking  

Science Conference Proceedings (OSTI)

Generally, in watermarking scheme the size of the watermark is very small when compare to host image. On the contrary, this is an attempt in which a new watermarking scheme is presented where the size of host image is very small when compare with watermark ... Keywords: Digital watermarking, Normalized mass matrix, Oversampling, Singular value decomposition, Stationary wavelet transform

Gaurav Bhatnagar; Q. M. Wu; Balasubramanian Raman

2013-09-01T23:59:59.000Z

366

Columbia University Libraries Preservation & Digital Conversion Division  

E-Print Network (OSTI)

Columbia University Libraries Preservation & Digital Conversion Division Disaster Response Manual for Care of Library Materials 2008 Edition #12;CUL Disaster Response Manual 2008 2 TABLE OF CONTENTS page. Disaster Response Coordinators List 31 B. Disaster Supply Center List 32 C. Vendor List 33 D. LSO

Salzman, Daniel

367

Digital Camera System on a Chip  

Science Conference Proceedings (OSTI)

Since the early 1990s, there has been an explosion of activity in the area of CMOS image sensors. Up until recently, the dominant and nearly only solid-state image sensor technology was the charge-coupled device (CCD). However, most microprocessors, ... Keywords: charge-coupled devices, signal processing, image sensors, CMOS, digital cameras

Eric R. Fossum

1998-05-01T23:59:59.000Z

368

Battery-Powered Digital CMOS Massoud Pedram  

E-Print Network (OSTI)

1 Page 1 USC Low Power CAD Massoud Pedram Battery-Powered Digital CMOS Design Massoud Pedram Power CAD Massoud Pedram Motivation Extending the battery service life of battery-powered micro in the VLSI circuit Y The battery system is assumed to be an ideal source that delivers a fixed amount

Pedram, Massoud

369

Digitization Noise in Power Spectral Analysis  

Science Conference Proceedings (OSTI)

It is well-known that the digitization noise variance is ?2/12 for a continuous time series sampled with the signal resolution ?. It is also generally accepted that this variance often has a white-power spectral density. We have examined in ...

L. Kristensen; P. Kirkegaard

1987-06-01T23:59:59.000Z

370

Developing digital cartography in rural planning applications  

Science Conference Proceedings (OSTI)

The main objective of the present study is to develop an efficient methodology at a reasonable cost, that will allow the use of the latest technological developments in the areas of image analysis and geographical information systems (GIS) for the generation, ... Keywords: Cartography updating, Digital aerial photogrammetry, GIS, High resolution satellite, Rural planning and development

Fernando J. Aguilar; Fernando Carvajal; Manuel A. Aguilar; Francisco Agüera

2007-02-01T23:59:59.000Z

371

On random sampling auctions for digital goods  

Science Conference Proceedings (OSTI)

In the context of auctions for digital goods, an interesting Random Sampling Optimal Price auction (RSOP) has been proposed by Goldberg, Hartline and Wright; this leads to a truthful mechanism. Since random sampling is a popular approach for auctions ... Keywords: auction, mechanism design, random sampling

Saeed Alaei; Azarakhsh Malekian; Aravind Srinivasan

2009-07-01T23:59:59.000Z

372

DIY Media: Digital Literacies and Learning through Popular Cultural Production  

Science Conference Proceedings (OSTI)

Schools remain notorious for co-opting digital technologies to business as usual approaches to teaching new literacies. DIY Media addresses this issue head-on, and describes expansive and creative practices of digital literacy that are increasingly influential ...

Michele Knobel; Colin Lankshear

2010-02-01T23:59:59.000Z

373

Record for pi : 206 billion decimal digits - CECM  

E-Print Network (OSTI)

... digits difference. Then we are declaring 206,158,430,000 decimal digits as the new world record. (More details soon at http://pi2.cc.u-tokyo.ac.jp/index.html) ...

374

T-711: Fraudulent Google Digital Certificates Could Allow Man...  

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

11: Fraudulent Google Digital Certificates Could Allow Man-in-the-Middle Attacks T-711: Fraudulent Google Digital Certificates Could Allow Man-in-the-Middle Attacks September 7,...

375

Determining the Publication Impact of a Digital Library  

Science Conference Proceedings (OSTI)

We attempt to assess the publicatin impact of a digital library (DL) of aerospace scientific and technical information (STI). The Langley Technical Report Server (LTRS) is a digital library of over 1,400 electronic publications authored by NASA Langley ...

Kaplan Nancy R.; Nelson Michael L.

2000-01-01T23:59:59.000Z

376

Direct Photons at RHIC  

E-Print Network (OSTI)

Abstract. The PHENIX experiment has measured direct photons in ? sNN = 200 GeV Au+Au collisions and p+p collisions. The fraction of photons due to direct

Saskia Mioduszewski; Phenix Collaboration

2004-01-01T23:59:59.000Z

377

Direct Loan Program (Connecticut)  

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

The Connecticut Development Authority’s Direct Loan Program provides direct senior and subordinated loans and mezzanine investments to companies creating or maintaining jobs. Up to $20,000 per job...

378

The effect of smoke from plastics on digital communications equipment  

SciTech Connect

Smoke from plastics can cause immediate problems in electrical equipment in the form of shorting and increased leakage currents, as well as long-term corrosion (metal loss). The short-term problems can be especially serious for critical control instrumentation such as that found in nuclear reactors or telecommunications systems. The US Nuclear Regulatory Commission and Sandia National Laboratories are sponsoring a program to determine the modes and probabilities of digital equipment failure during exposure to smoke and up to 24 hours after the exposure. Early tests on computer systems have shown that the most common immediate problems are temporary and are likely to be caused by increased leakage currents. High-voltage circuits are especially vulnerable since the charged particles in smoke are drawn to those surfaces. To study failure probabilities, smoke exposure tests with real-time measurements will be carried out to determine how the electrical properties of the environment are affected by smoke concentration and content. Digital communication cable will be included in the tests because temporary shorts that cannot be detected through dc measurements may cause interruptions in communications between computers. The reaction of the equipment to changed electrical properties of the environment will be modeled. Equipment that can be used for testing and modeling is being solicited.

Tanaka, T.J. [Sandia National Labs., Albuquerque, NM (United States). Accident and Consequence Analysis Dept.; Chapin, J.T. [Lucent Technologies, Norcross, GA (United States). Bell Labs.

1998-07-01T23:59:59.000Z

379

Superconducting VAR control. [Patent application  

DOE Patents (OSTI)

Static VAR control means are described employing an asymmetrically controlled Graetz bridge and a superconducting direct current coil having low losses and low cost characteristics.

Boenig, H.J.; Hassenzahl, W.V.

1980-12-05T23:59:59.000Z

380

Direct process for explosives  

DOE Patents (OSTI)

A direct process of making ethylenediamine dinitrate through the reaction of ethylenediamine and ammonium nitrate is described.

Akst, I.B.; Stinecipher, M.M.

1982-10-12T23:59:59.000Z

Note: This page contains sample records for the topic "direct digital controls" 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

The FIPS 186-4 Digital Signature Algorithm Validation System ...  

Science Conference Proceedings (OSTI)

... pass for formal validation, and general instruction for interfacing ... 5 Design Philosophy of the Digital Signature Algorithm Validation System ...

2013-09-17T23:59:59.000Z

382

Magnesium: Digital Resource Center - ARTICLE: Safe Machining of ...  

Science Conference Proceedings (OSTI)

Sep 7, 2007... Other ==== Miscellaneous Digital Resources in Magnesium. Spacer ... Topic Title: ARTICLE: Safe Machining of Magnesium Parts by Cutting ...

383

Energy Efficient Digital Logic Using Nanoscale Magnetic Devices  

E-Print Network (OSTI)

the power consumption of future digital logic devices. Theimpact of device scaling on power consumption [6, 7].

Lambson, Brian

2013-01-01T23:59:59.000Z

384

Control system for Kaplan hydro-turbine  

Science Conference Proceedings (OSTI)

In hydro power plants from Romania, there is a major interest for the implementation of digital systems for monitoring and control to replace the conventional control systems for power, frequency and voltage. Therefore is necessary to develop mathematical ... Keywords: Kaplan turbine, control system, turbine model

Matei Vinatoru; Eugen Iancu; Camelia Maican; Gabriela Canureci

2008-10-01T23:59:59.000Z

385

DIGITAL STANDARDS BIBLIOGRAPHY VERSION 2.0: EXPOSURE DRAFT  

E-Print Network (OSTI)

The Collections Council of Australia Ltd is supported by the Cultural Ministers Council. The Bibliography of Digital Standards is a preliminary list of standards and guidelines that inform and assist the creation and management of digital collections. The Bibliography was initially published as part of the Collection Council of Australia’s Summit on Digital Collections: Working Papers in August 2007. It is currently

Collections Council

2008-01-01T23:59:59.000Z

386

A digital rock density map of New Zealand  

Science Conference Proceedings (OSTI)

Digital geological maps of New Zealand (QMAP) are combined with 9256 samples with rock density measurements from the national rock catalogue PETLAB and supplementary geological sources to generate a first digital density model of New Zealand. This digital ... Keywords: Crust, Database, Density, Geological mapping, Gravimetry, Rock types

Robert Tenzer; Pascal Sirguey; Mark Rattenbury; Julia Nicolson

2011-08-01T23:59:59.000Z

387

The digital divide and e-government services  

Science Conference Proceedings (OSTI)

There is much research examining the digital divide and what it looks like in society. This research often describes the digital divide as yet another symptom of the current socio-economic division in our society. Based on this research, one would expect ... Keywords: digital divide, e-governance, e-government, internet, mobile divide, public assistance, socio-economic, welfare

Thad E. Hall; Jennifer Owens

2011-09-01T23:59:59.000Z

388

Digital homes on wheels: designing for the unimagined home  

Science Conference Proceedings (OSTI)

Design for the digital home is often predicated on an ideal, imagined domestic space that is expansive, stable, occupied by a "busy" nuclear family, and does not always match existing, real-life digital homes. Using American retirees living full time ... Keywords: Design, Digital Home, Ethnography, Mobility, Recreational vehicle

Alexandra Zafiroglu; Michele Chang

2007-06-01T23:59:59.000Z

389

Calibration of Digital Amateur Cameras  

E-Print Network (OSTI)

We introduce a novel outlook on the self-calibration task, by considering images taken by a camera in motion, allowing for zooming and focusing. Apart from the complex relationship between the lens control settings and the intrinsic camera parameters, a prior off-line calibration allows to neglect the setting of focus, and to fix the principal point and aspect ratio throughout distinct views. Thus, the calibration matrix is dependent only on the zoom position. Given a fully calibrated reference view, one has only one parameter to estimate for any other view of the same scene, in order to calibrate it and to be able to perform metric reconstructions. We provide a close-form solution, and validate the reliability of the algorithm with experiments on real images. An important advantage of our method is a reduced - to one - number of critical camera configurations, associated with it. Moreover, we propose a method for computing the epipolar geometry of two views, taken from different positions and with different (spatial) resolutions; the idea is to take an appropriate third view, that is "easy" to match with the other two.

Magdalena Urbanek; Magdalena Urbanek; Radu Horaud; Radu Horaud; Peter Sturm; Peter Sturm; Projet Movi

2001-01-01T23:59:59.000Z

390

The Digital Geography Lab at Salem State University: The Evolution of One of the Oldest Educational Digital Geospatial Labs  

Science Conference Proceedings (OSTI)

Established in 1983, the Digital Geography Lab (DGL) at Salem State University (SSU) is one of the oldest higher-education digital spatial labs. This paper details the evolution of the DGL as well as its current status as one of the best computer labs ... Keywords: Computer Lab, Digital Geography Lab (DGL), GIS, Geography, Higher Education

Stephen S. Young; Kym Pappathanasi

2012-07-01T23:59:59.000Z

391

The Temperature and Relative Humidity Control in Cushing Library  

E-Print Network (OSTI)

Cushing Library located on TAMU campus is a special building, which needs precise temperature and relative humidity control, because it stores a number of rare collections and memorial books. There are five air-handling units (AHUs) serving the building. This paper will concentrate the unit, which serves the book stacks. This AHU is a multiple zone, constant air volume (MZCAV) system, with reheat and direct digital control (DDC). It has a standard cooling coil, glycol cooling coil, steam humidifier, and heat recovery. The chilled water to the standard cooling coil is served by the chilled water loop on the campus. There is a glycol chiller for the glycol cooling coil for added dehumidification ability. Because of programming problems and hardware problems, the relative humidity was not controlling properly. In this paper, the new control program for temperature and relative humidity control is implemented and the energy savings from the new control program is estimated. The temperature and relative humidity are now under control.

Liu, C.; Deng, S.; Claridge, D. E.; Turner, W. D.; Bruner, H., Jr.

2002-01-01T23:59:59.000Z

392

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

393

Adaptive fuzzy logic control of discrete-time dynamical systems  

Science Conference Proceedings (OSTI)

The objective of this paper is to achieve tracking control of a class of unknown nonlinear dynamical systems using a discrete-time fuzzy logic controller (FLC). Designing a discrete-time FLC is significant because almost all FLCs are implemented on digital ... Keywords: Adaptive control, Discrete-time control, Fuzzy approximation, Fuzzy logic, Universal fuzzy controller

S. Jagannathan; M. W. Vandegrift; F. L. Lewis

2000-02-01T23:59:59.000Z

394

Table-top computed lighting for practical digital photography  

E-Print Network (OSTI)

Abstract—We apply simplified image-based lighting methods to reduce the equipment, cost, time, and specialized skills required for high-quality photographic lighting of desktop-sized static objects such as museum artifacts. We place the object and a computersteered moving-head spotlight inside a simple foam-core enclosure and use a camera to record photos as the light scans the box interior. Optimization, guided by interactive user sketching, selects a small set of these photos whose weighted sum best matches the user-defined target sketch. Unlike previous image-based relighting efforts, our method requires only a single area light source, yet it can achieve high-resolution light positioning to avoid multiple sharp shadows. A reduced version uses only a handheld light and may be suitable for battery-powered field photography equipment that fits into a backpack. Index Terms—Image-based lighting, enclosure lighting, handheld lighting, controllable lighting, digital photography. 1

Ankit Mohan; Reynold Bailey; Jonathan Waite; Jack Tumblin; Cindy Grimm; Bobby Bodenheimer; Senior Member

2005-01-01T23:59:59.000Z

395

Optical Synchrotron Radiation Beam Imaging with a Digital Mask  

SciTech Connect

We have applied a new imaging/optical masking technique, which employs a digital micro-mirror device (DMD) and optical synchrotron radiation (OSR), to perform high dynamic range (DR) beam imaging at the JLAB Energy Recovery Linac and the SLAC/SPEAR3 Synchrotron Light Source. The OSR from the beam is first focused onto the DMD to produce a primary image; selected areas of this image are spatially filtered by controlling the state of individual micro-mirrors; and finally, the filtered image is refocused onto a CCD camera. At JLAB this technique has been used successfully to view the beam halo with a DR ~ 105. At SPEAR3 the DMD was used to filter out the bright core of the stored beam to study the turn-by-turn dynamics of the 10-3 weaker injected beam. We describe the optical performance, present limitations and our plans to improve the DR of both experimental systems.

Fiorito, R B; Zhang, H D; Corbett, W J; Fisher, A S; Mok, W Y; Tian, K; Douglas, D; Wilson, F G; Zhang, S

2012-11-01T23:59:59.000Z

396

Towards an Automated Digital Data Forensic Model with specific reference to Investigation Processes  

E-Print Network (OSTI)

Existing digital forensics frameworks do not provide clear guidelines for conducting digital forensics investigation. However, had a framework existed, investigations based on known procedures and processes would follow strict prescribed standardisation. This should direct investigations following a set method for comparisons; ensuring future investigation is following one standard. Digital forensics lack confirmed and tested methods; this became obvious when we consider varied interpretations of the same case by participants using different investigation methods. Previous research covered several approaches to setting a forensics framework, which are mere adaptations of previous models. We found that only a few models present a framework that defines or delivers qualified likeness between the different disciplines. From this, possible pattern analysis from different disciplines is possible (Kohn, 2007). This underlines the need to standardise processes, to ensure proven and consistent results. Digital Forensics Science needs a new approach, defining and standardising investigation processes by affirming an investigation framework. Present research does not enough cover how existing forensic frameworks are used as guideline while conduct investigations. As a result, wide general interpretations are possible instead of following a set standard. Investigation processes and in particular how data confirmation is conducted during and after

Australian Digital; Forensics Conference; Johan Scholtz; Ajit Narayanan; Johan Scholtz; Professor Ajit Narayanan

2010-01-01T23:59:59.000Z

397

Practical Maintenance of Digital Systems: Guidance to Maximize the Benefits of Digital Technology for the Maintenance of Digital Sys tems and Plant Equipment  

Science Conference Proceedings (OSTI)

For operators to take maximum advantage of digital technology being implemented in nuclear power plants, they must reduce the cost and likelihood of human errors in maintenance and testing of new digital systems and human-system interfaces (HSIs). Designing for maintenance and testing is a fundamental part of the design effort for any plant system -- and digital upgrade modifications are no exception. This report provides guidance for plant operators and designers for achieving cost-effective maintainabi...

2004-10-11T23:59:59.000Z

398

Digitally programmable signal generator and method  

DOE Patents (OSTI)

A digitally programmable signal generator (DPSG) and method are disclosed. The DPSG can be used in applications such as Atomic Vapor Laser Isotope Separation (AVLIS) to create an optimal match between the process laser's spectral profile and that of the vaporized material. Other applications include optical telecommunications, non-optical telecommunication in the microwave and radio spectrum, radar, electronic countermeasures, high speed computer interconnects, local area networks, high definition video transport and the multiplexing of large quantities of slow digital memory into high speed data streams. This invention extends the operation of DPSGs into the GHz range, while preserving all of the current art's DPSGs' operational features.

Priatko, G.J.; Kaskey, J.A.

1986-09-02T23:59:59.000Z

399

Fundamental concepts of digital image processing  

SciTech Connect

The field of a digital-image processing has experienced dramatic growth and increasingly widespread applicability in recent years. Fortunately, advances in computer technology have kept pace with the rapid growth in volume of image data in these and other applications. Digital image processing has become economical in many fields of research and in industrial and military applications. While each application has requirements unique from the others, all are concerned with faster, cheaper, more accurate, and more extensive computation. The trend is toward real-time and interactive operations, where the user of the system obtains preliminary results within a short enough time that the next decision can be made by the human processor without loss of concentration on the task at hand. An example of this is the obtaining of two-dimensional (2-D) computer-aided tomography (CAT) images. A medical decision might be made while the patient is still under observation rather than days later.

Twogood, R.E.

1983-03-01T23:59:59.000Z

400

Measuring microfocus focal spots using digital radiography  

SciTech Connect

Measurement of microfocus spot size can be important for several reasons: (1) Quality assurance during manufacture of microfocus tubes; (2) Tracking performance and stability of microfocus tubes; (3) Determining magnification (especially important for digital radiography where the native spatial resolution of the digital system is not adequate for the application); (4) Knowledge of unsharpness from the focal spot alone. The European Standard EN 12543-5 is based on a simple geometrical method of calculating focal spot size from unsharpness of high magnification film radiographs. When determining microfocus focal spot dimensions using unsharpness measurements both signal-to-noise (SNR) and magnification can be important. There is a maximum accuracy that is a function of SNR and therefore an optimal magnification. Greater than optimal magnification can be used but it will not increase accuracy.

Fry, David A [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "direct digital controls" 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

Processing of 3-Line Imagery on a Digital Photogrammetric Workstation  

E-Print Network (OSTI)

One of the main topics in photogrammetry is the development of automatic processing techniques, e.g. for aerotriangulation and stereo restitution, both starting from digital aerial imagery. On the other hand digital cameras and sensors gain more and more importance. One of the most promising sensor concept makes use of three linear CCD arrays. This paper deals with the special geometry of 3-line imagery and the consequences for the processing on a digital photogrammetric workstation. Keywords: digital photogrammetric workstations, 3-line imagery, stereo restitution, MOMS-02 1. INTRODUCTION Digital photogrammetric systems are still one of the main topics in ISPRS Commission II. During the period 1992-- 1996 the Intercommision Working Group II/III "Digital Photogrammetric Systems" dealt with this research topic, and also in the period 1996--2000 the ISPRS Working Group II/8 "Digital Systems for Image Analysis" will consider systems for automatic image orientation, generation of digita...

Rüdiger Brand; Timm Ohlhof; Manfred Stephani

1997-01-01T23:59:59.000Z

402

Direct Photons at RHIC  

E-Print Network (OSTI)

The PHENIX experiment has measured direct photons in $\\sqrt{s_{NN}} = 200$ GeV Au+Au collisions and p+p collisions. The fraction of photons due to direct production in Au+Au collisions is shown as a function of $p_T$ and centrality. This measurement is compared with expectation from pQCD calculations. Other possible sources of direct photons are discussed.

S. Mioduszewski; for the PHENIX Collaboration

2004-09-29T23:59:59.000Z

403

Digital computer operation of a nuclear reactor  

DOE Patents (OSTI)

A method is described for the safe operation of a complex system such as a nuclear reactor using a digital computer. The computer is supplied with a data base containing a list of the safe state of the reactor and a list of operating instructions for achieving a safe state when the actual state of the reactor does not correspond to a listed safe state, the computer selects operating instructions to return the reactor to a safe state.

Colley, R.W.

1982-06-29T23:59:59.000Z

404

Digital computer operation of a nuclear reactor  

DOE Patents (OSTI)

A method is described for the safe operation of a complex system such as a nuclear reactor using a digital computer. The computer is supplied with a data base containing a list of the safe state of the reactor and a list of operating instructions for achieving a safe state when the actual state of the reactor does not correspond to a listed safe state, the computer selects operating instructions to return the reactor to a safe state.

Colley, Robert W. (Richland, WA)

1984-01-01T23:59:59.000Z

405

Proceedings: Distributed Digital Systems, Plant Process  

Science Conference Proceedings (OSTI)

A workshop on Distributed Digital Systems, Plant Process Computers, and Networks was held in Charlotte, North Carolina on August 16-18, 1994. The purpose of the workshop was to provide a forum for technology transfer, technical information exchange, and education. The workshop was attended by more than 100 representatives of electric utilities, equipment manufacturers, engineering service organizations, and government agencies. The workshop consisted of three days of presentations, exhibitions, a panel d...

1995-03-31T23:59:59.000Z

406

Digital Holographic Interferometry and Speckle Correlation  

Science Conference Proceedings (OSTI)

Relations and combinations between holographic interferometry and speckle correlation in contouring by phase?shifting digital holography are discussed. Three?dimensional distributions of correlations of the complex amplitudes and intensities before and after the laser wavelength shift are calculated in numerical simulations where a rough surface is modeled with random numbers. Fringe localization related to speckle displacement as well as speckle suppression in phase analysis are demonstrated for general surface shape and recording conditions.

Ichirou Yamaguchi; Scientist Emeritus of RIKEN

2010-01-01T23:59:59.000Z

407

Digital Radiographic Image Storage and Retrieval  

Science Conference Proceedings (OSTI)

Fabrication and construction radiographs of nuclear plant components contain information valuable for clarifying inservice inspection results and assessing component remaining life. Preservation of radiographic information has become an issue in light of observed instances of degraded radiographs in nuclear plant collections. This report summarizes results to date of a project to provide guidance for evaluating a radiographic film collection and progress on establishing film digitization criteria as an a...

1994-01-01T23:59:59.000Z

408

Content-Based Off-Axis Illumination for Direct-to-Digital Holography  

PRICE, JEFFERY R Engineering Science & Technology Div Licensing Contact SPEIGHT II, MELVIN D UT-Battelle, LLC Oak Ridge National Laboratory

409

New methods for measuring spectral bi-directional transmission and reflection using digital cameras  

E-Print Network (OSTI)

Advanced fenestration systems are increasingly being used to distribute solar radiation purposefully in buildings. Distribution of visible light and near infrared radiation can be optimized to enhance daylighting and reduce ...

Gayeski, Nicholas (Nicholas Thomas)

2007-01-01T23:59:59.000Z

410

Direct Photons at RHIC  

E-Print Network (OSTI)

A brief overview of direct-photon measurements in p+p and Au+Au collisions at sqrt(s_NN) = 200 GeV with the PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC) is given. Direct-photon yields for pT > 4 GeV/c and photon-hadron azimuthal correlations were determined with the aid of an electromagnetic calorimeter. By detecting e+e- pairs from the internal conversion of virtual photons direct-photon yields were measured between 1 direct-photon yield in this range.

Klaus Reygers; for the PHENIX Collaboration

2009-08-17T23:59:59.000Z

411

Direct energy conversion systems  

SciTech Connect

The potential importance of direct energy conversion to the long-term development of fusion power is discussed with stress on the possibility of alleviating waste heat problems. This is envisioned to be crucial for any central power station in the 21st century. Two approaches to direct conversion, i.e., direct collection and magnetic expansion, are reviewed. While other techniques may be possible, none have received sufficient study to allow evaluation. It is stressed that, due to the intimate connection between the type of fusion fuel, the confinement scheme, direct conversion, and the coupling technique, all four element must be optimized simultaneously for high overall efficiency.

Miley, G.H.

1978-01-01T23:59:59.000Z

412

Image display device in digital TV  

DOE Patents (OSTI)

Disclosed is an image display device in a digital TV that is capable of carrying out the conversion into various kinds of resolution by using single bit map data in the digital TV. The image display device includes: a data processing part for executing bit map conversion, compression, restoration and format-conversion for text data; a memory for storing the bit map data obtained according to the bit map conversion and compression in the data processing part and image data inputted from an arbitrary receiving part, the receiving part receiving one of digital image data and analog image data; an image outputting part for reading the image data from the memory; and a display processing part for mixing the image data read from the image outputting part and the bit map data converted in format from the a data processing part. Therefore, the image display device according to the present invention can convert text data in such a manner as to correspond with various resolution, carry out the compression for bit map data, thereby reducing the memory space, and support text data of an HTML format, thereby providing the image with the text data of various shapes.

Choi, Seung Jong (Seoul, KR)

2006-07-18T23:59:59.000Z

413

Digital instability of a confined elastic meniscus  

E-Print Network (OSTI)

Thin soft elastic layers serving as joints between relatively rigid bodies may function as sealants, thermal, electrical, or mechanical insulators, bearings, or adhesives. When such a joint is stressed, even though perfect adhesion is maintained, the exposed free meniscus in the thin elastic layer becomes unstable, leading to the formation of spatially periodic digits of air that invade the elastic layer, reminiscent of viscous fingering in a thin fluid layer. How- ever, the elastic instability is reversible and rate-independent, dis- appearing when the joint is unstressed. We use theory, experiments, and numerical simulations to show that the transition to the digital state is sudden (first-order), the wavelength and amplitude of the fingers are proportional to the thickness of the elastic layer, and the required separation to trigger the instability is inversely proportional to the in-plane dimension of the layer. Our study reveals the energetic origin of this instability and has implications for the strength of polymeric adhesives; it also suggests a method for patterning thin films reversibly with any arrangement of localized fingers in a digital elastic memory, which we confirm experimentally.

John S. Biggins; Baudouin Saintyves; Zhiyan Wei; Elisabeth Bouchaud; L. Mahadevan

2013-08-13T23:59:59.000Z

414

Portable Digital Radiography and Computed Tomography Manual  

SciTech Connect

This user manual describes the function and use of the portable digital radiography and computed tomography (DRCT) scanner. The manual gives a general overview of x-ray imaging systems along with a description of the DRCT system. An inventory of the all the system components, organized by shipping container, is also included. In addition, detailed, step-by-step procedures are provided for all of the exercises necessary for a novice user to successfully collect digital radiographs and tomographic images of an object, including instructions on system assembly and detector calibration and system alignment. There is also a short section covering the limited system care and maintenance needs. Descriptions of the included software packages, the DRCT Digital Imager used for system operation, and the DRCT Image Processing Interface used for image viewing and tomographic data reconstruction are given in the appendixes. The appendixes also include a cheat sheet for more experienced users, a listing of known system problems and how to mitigate them, and an inventory check-off sheet suitable for copying and including with the machine for shipment purposes.

Not Available

2007-11-01T23:59:59.000Z

415

A Summary of Taxonomies of Digital System Failure Modes Provided by the DigRel Task Group  

SciTech Connect

Recently, the CSNI directed WGRisk to set up a task group called DIGREL to initiate a new task on developing a taxonomy of failure modes of digital components for the purposes of PSA. It is an important step towards standardized digital I&C reliability assessment techniques for PSA. The objective of this paper is to provide a comparison of the failure mode taxonomies provided by the participants. The failure modes are classified in terms of their levels of detail. Software and hardware failure modes are discussed separately.

Chu T. L.; Yue M.; Postma, W.

2012-06-25T23:59:59.000Z

416

Behavioral modeling and digital calibration of pipeline analog to digital converters  

E-Print Network (OSTI)

This research focuses on digital calibration of pipeline analog to digital converters (ADCs) and also modeling of error sources and design parameters of pipeline ADCs. Modern applications such as communications systems require high resolution ADCs at high rates of conversion speed. Pipeline ADCs show great potential for high-speed high-resolution applications. But limited matching property of available process technologies does not permit implementation of high-resolution pipeline ADCs unless a calibration scheme is used. There are two major methods of calibration. The first uses some redundant analog components implemented during the design of the ADC to adjust some of the analog components. These redundant analog components also have limited accuracy and cause some additional problems such as loading and area consumption. Laser trimming of analog components cannot solve the problem due to difficulty of accurate trimming beyond 12-bit. Correcting the component's matching error in digital domain is the second method of calibration. This thesis presents detailed analyses for the possibility of digital correction of the errors due to analog circuitry. As a result an efficient method for the digital calibration method is proposed. This method has the advantage of measuring the required calibration coefficients by sweeping the input voltage through the whole dynamic range.

Bilhan, Erkan

2001-01-01T23:59:59.000Z

417

direct_deposit_111609  

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

PROTECT YOUR BANKING INFORMATION: PROTECT YOUR BANKING INFORMATION: DO NOT complete this form until you are ready to submit it to the Payroll Department. DIRECT DEPOSIT REQUEST Directions: 1. Provide required information neatly, legibly; 2. If Checking Account Direct Deposit, include a voided check. a. DO NOT submit a deposit slip! 3. If Savings Account Direct Deposit, include a copy of savings card. 4. Sign this form; 5. Inter-office mail it to Craft Payroll at "P238." DIRECT DEPOSITION AUTHORIZATION I hereby authorize Los Alamos National Laboratory, hereinafter called The Laboratory, to initiate credit entries and, if necessary, debit entries and adjustments for any credit entries in error to my account listed on this form. If deposit is for:

418

Directions and Maps  

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

Directions & Maps Directions & Maps Plan Your Visit Visit About the Museum Museum Hours Directions & Maps When to Visit Arrange for a Visit Around Los Alamos Contact Us invisible utility element Directions and Maps Aerial View of Los Alamos Aerial approach to the Los Alamos airport Where we're located Los Alamos (elevation 7,355 feet) is perched high atop the Pajarito Plateau in the Jemez Mountains, 35 miles northwest of Santa Fe. The Bradbury Science Museum is located in downtown Los Alamos at the corner of Central Avenue and 15th Street. If you're driving here and using GPS navigation, our address is 1350 Central Avenue, Los Alamos, NM 87544. How to get here From Albuquerque take I-25 north to Santa Fe (take NM 599 for most direct route), then US 84/285 north to Pojoaque. At Pojoaque take the NM 502 exit

419

Handbook for Verification and Validation of Digital Systems, Volume 1: Revision 1  

Science Conference Proceedings (OSTI)

With the increasing use of digital instrumentation and control systems in power plants, utilities must determine the dependability and predictability of such systems and their software. This updated handbook provides a comprehensive guide to help utilities understand the verification and validation (V&V) process. The handbook presents a graded approach to select convenient V&V methods, develop a V&V plan, generate necessary documentation, and conduct appropriate V&V activities.

1998-12-15T23:59:59.000Z

420

Defense-in-Depth and Diversity for Digital Upgrades: Status of Industry and NRC Activities  

Science Conference Proceedings (OSTI)

As the nuclear industry has started to transition from analog to digital instrumentation and control (I&C), one issue that has remained particularly problematic is the potential for faults in identical software components to simultaneously disable redundant trains of safety-related systems or multiple critical systems. Such failures may create the possibility to defeat the traditional nuclear plant safety barriers that rely on redundant hardware trains to ensure high reliability of safety-critical system...

2007-12-14T23:59:59.000Z

Note: This page contains sample records for the topic "direct digital controls" 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

Handbook for Verification and Validation of Digital Systems, Volume 2: Case Histories  

Science Conference Proceedings (OSTI)

With the increasing use of digital instrumentation and control systems in power plants, utilities must determine the dependability and predictability of such systems and their software. This updated handbook provides a comprehensive guide to help utilities understand the verification and validation (V&V) process. The handbook presents a graded approach to select convenient V&V methods, develop a V&V plan, generate necessary documentation, and conduct appropriate V&V activities.

1998-12-15T23:59:59.000Z

422

REACTOR CONTROL  

DOE Patents (OSTI)

A control system employed with a high pressure gas cooled reactor in which a control rod is positioned for upward and downward movement into the neutron field from a position beneath the reactor is described. The control rod is positioned by a coupled piston cylinder releasably coupled to a power drive means and the pressurized coolant is directed against the lower side of the piston. The coolant pressure is offset by a higher fiuid pressure applied to the upper surface of the piston and means are provided for releasing the higher pressure on the upper side of the piston so that the pressure of the coolant drives the piston upwardly, forcing the coupled control rod into the ncutron field of the reactor. (AEC)

Fortescue, P.; Nicoll, D.

1962-04-24T23:59:59.000Z

423

Technical communication: Extending the analog input capabilities of the DS1102 DSP controller board  

Science Conference Proceedings (OSTI)

The paper deals with an extention of the number of analog inputs of the DS1102 controller board which is commonly used in the area of electric machines. Manufactured with just four analog inputs, the DS1102 has been found inadequate for the implementation ... Keywords: Analog multiplexing, Analog to digital converters, Digital signal processor, Doubly-fed machine, Field oriented control

Badreddine Louhichi; Ahmed Masmoudi; Luc Loron

2005-01-01T23:59:59.000Z

424

Procurement documentation for the beam characterization subsystem: pyrheliometer, digitizer, MODACS III, video camera. RADL item No. 3-4  

DOE Green Energy (OSTI)

Procurement documentation is given describing the basic features of the parts of a Beam Characterization System of a solar central receiver facility. Parts include pyrheliometers, a digitizer, components of the data acquisition and control system, and video cameras. The specification establishing the performance and acceptance requirements for the video cameras are given. (LEW)

Not Available

1980-02-01T23:59:59.000Z

425

2012 CERTS LAAR Program Peer Review - Integration and Extension of Direct Load Management of Smart Loads - Anna Scaglioni, UC Davis  

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

Integration and Extension of Direct Integration and Extension of Direct Load Management of Smart Loads Anna Scaglione, UC Davis GRA: Mahnoosh Alizadeh Project objective  Invent methods to "store" load demand for * Real-time "generation following" * Integration of load reserves as dispatchable assets in the Energy Market  Architecture for virtual "reserves" (queues) of electrical load demand * Watts to Job mapping (analysis)  Captures digitally the service requirements - Equal service type = Equal queue * Job to Watts mapping (synthesis)  Allows to optimally schedule the load profile Major technical accomplishments  Centralized model: Digital Direct Load Scheduling (DDLS) - Year 1-Year 2

426

Surface Wind Direction Variability  

Science Conference Proceedings (OSTI)

Common large shifts of wind direction in the weak-wind nocturnal boundary layer are poorly understood and are not adequately captured by numerical models and statistical parameterizations. The current study examines 15 datasets representing a ...

Larry Mahrt

2011-01-01T23:59:59.000Z

427

2013 FCMN Directions  

Science Conference Proceedings (OSTI)

... $100 (one way). Driving directions: Take I-95S to Exit 4B towards Washington.Merge onto I-495 to Exit 27 towards Silver Spring.Slight right onto ...

2013-02-27T23:59:59.000Z

428

Direct nuclear pumped laser  

DOE Patents (OSTI)

There is provided a direct nuclear pumped gas laser in which the lasing mechanism is collisional radiated recombination of ions. The gas laser active medium is a mixture of the gases, with one example being neon and nitrogen.

Miley, George H. (Champagne, IL); Wells, William E. (Urbana, IL); DeYoung, Russell J. (Hampton, VA)

1978-01-01T23:59:59.000Z

429

Maps & Directions | ORNL  

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

Maps & Directions ORNL is located in Roane County, Tennessee, about 7 miles from the center of the city of Oak Ridge and about 25 miles from the McGhee Tyson Airport near...

430

Digitizing Legacy STI | Scientific and Technical Information Program  

Office of Scientific and Technical Information (OSTI)

Digitizing Legacy STI Digitizing Legacy STI Print page Print page Email page Email page As electronic access to information becomes the norm, many sites are engaged in digitizing their legacy documents (those produced in print prior to 2001). Making these files available through the OSTI databases will help realize the full potential of the Department's scientific and technical information. OSTI will work together with sites across the DOE Complex to provide access to digitized full-text documents in announcement notices in the Energy Link (E-Link) system that do not contain digitized full-text documents. Finding Digitized STI at OSTI DOE and major DOE contractor sites with E-Link access can utilize the Full-text Change report accessible through the Reports section of E-Link. Sites can search by date range for all full-text items that have

431

Renewable Energy & Energy Efficiency Partnership (REEEP) Digital Library |  

Open Energy Info (EERE)

Renewable Energy & Energy Efficiency Partnership (REEEP) Digital Library Renewable Energy & Energy Efficiency Partnership (REEEP) Digital Library Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Renewable Energy and Energy Efficiency Partnership (REEEP) Digital Library Agency/Company /Organization: Renewable Energy and Energy Efficiency Partnership Sector: Energy Focus Area: Energy Efficiency Resource Type: Training materials Website: toolkits.reeep.org/ References: Renewable Energy & Energy Efficiency Partnership (REEEP) Digital Library[1] Logo: Renewable Energy and Energy Efficiency Partnership (REEEP) Digital Library The REEEP digital library offers an array of information in the field of Renewable Energy and Energy Efficiency. These range from policy papers and case studies to presentations that are produced by REEEP funded projects

432

Refrigerant directly cooled capacitors  

DOE Patents (OSTI)

The invention is a direct contact refrigerant cooling system using a refrigerant floating loop having a refrigerant and refrigeration devices. The cooling system has at least one hermetic container disposed in the refrigerant floating loop. The hermetic container has at least one electronic component selected from the group consisting of capacitors, power electronic switches and gating signal module. The refrigerant is in direct contact with the electronic component.

Hsu, John S. (Oak Ridge, TN); Seiber, Larry E. (Oak Ridge, TN); Marlino, Laura D. (Oak Ridge, TN); Ayers, Curtis W. (Kingston, TN)

2007-09-11T23:59:59.000Z

433

Sloan Digital Sky Survey Photometric Calibration Revisited  

SciTech Connect

The Sloan Digital Sky Survey calibration is revisited to obtain the most accurate photometric calibration. A small but significant error is found in the flat-fielding of the Photometric telescope used for calibration. Two SDSS star catalogs are compared and the average difference in magnitude as a function of right ascension and declination exhibits small systematic errors in relative calibration. The photometric transformation from the SDSS Photometric Telescope to the 2.5 m telescope is recomputed and compared to synthetic magnitudes computed from measured filter bandpasses.

Marriner, John; /Fermilab

2012-06-29T23:59:59.000Z

434

New Plug-Together Digital Multimeter  

E-Print Network (OSTI)

in sections that plug together to form a compactnstrument, giving the user a chorce of capabilities By Albert Gookin 'TtHS PHOTO below shows Hewlett-Packard's section (Model 347o1A) that measures only dc in I newest a-digit voltmeter, the Model 3470 Mea- four ranges from 1 volt full-scale to 1000 volts. Future plug-on sections will include autoranging, high-sensitivity current measurements and other functional capabilities. For those who wish to design their own signal-conditioning circuits, an empty bottom section is also available Iouter shells are cast aluminum]. Center sections can be placed between the top and

unknown authors

1972-01-01T23:59:59.000Z

435

Direct Fingerprinting on Multicasting Compressed Video  

Science Conference Proceedings (OSTI)

A video fingerprint is a kind of digital watermark used in digital video for tracking pirate copies in a multi-user environment. Different users receive the same video with different watermarks designed for uniquely identifying designated users. As a ...

Zheng Liu; Xue Li; Zhaoyang Dong

2005-01-01T23:59:59.000Z

436

Outline Development of Direct PCR Benefits of Direct PCR ...  

Science Conference Proceedings (OSTI)

... 1 Direct PCR Amplification of STR Loci: Protocols and Performance ... Benefits of direct PCR • Collection media: FTA and 903 paper ...

2011-05-31T23:59:59.000Z

437

Digital TV vs internet: similarities suggest future opportunities for SMEs to advertise on digital TV  

Science Conference Proceedings (OSTI)

Television has been a medium commonly used by enterprises to promote their values, products, services and offers. TV advertising can be expensive, affordable only to enterprises with a substantial budget for promotion. That leaves a great number of Small ... Keywords: advertising, connected tv, digital tv, small business, sme

Rafael Gonçalez Carneiro

2011-06-01T23:59:59.000Z

438

Space, place, and database : layers of digital cartography  

E-Print Network (OSTI)

This paper addresses the changes in cartography since digitization and widespread popular dissemination. Cybercartography, an emergent system of maps, mapmaking tools, and mapmakers, forces a rethinking of spatial ...

Finkelberg, Amanda (Amanda Suzanne)

2007-01-01T23:59:59.000Z

439

Digital Offshore Cadastre (DOC) - Pacific83 - Baseline Points...  

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

Points Ocean Data Tools Technical Guide Map Gallery Regional Planning Feedback Ocean You are here Data.gov Communities Ocean Data Digital Offshore Cadastre (DOC) -...

440

Digital Offshore Cadastre (DOC) - Pacific83 - Ecological Preserve...  

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

Ecological Preserve Ocean Data Tools Technical Guide Map Gallery Regional Planning Feedback Ocean You are here Data.gov Communities Ocean Data Digital Offshore Cadastre...

Note: This page contains sample records for the topic "direct digital controls" 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

Digital Offshore Cadastre (DOC) ? Pacific83 ? OCS Blocks |...  

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

OCS Blocks Ocean Data Tools Technical Guide Map Gallery Regional Planning Feedback Ocean You are here Data.gov Communities Ocean Data Digital Offshore Cadastre (DOC) ...

442

Digital Offshore Cadastre (DOC) ? Pacific83 ? Planning Area...  

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

Planning Area Outlines Ocean Data Tools Technical Guide Map Gallery Regional Planning Feedback Ocean You are here Data.gov Communities Ocean Data Digital Offshore Cadastre...

443

Digital Offshore Cadastre (DOC) - Pacific83 Â? Continental...  

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

Continental Shelf Boundaries Ocean Data Tools Technical Guide Map Gallery Regional Planning Feedback Ocean You are here Data.gov Communities Ocean Data Digital...

444

Digital Offshore Cadastre (DOC) - Pacific83 - Baseline Tangent...  

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

Tangent Lines Ocean Data Tools Technical Guide Map Gallery Regional Planning Feedback Ocean You are here Data.gov Communities Ocean Data Digital Offshore Cadastre (DOC) -...

445

Materials for Nuclear Power: Digital Resource Center - TMS  

Science Conference Proceedings (OSTI)

Spacer 62115 users are registered to the Materials for Nuclear Power: Digital Resource Center forum. Spacer There are currently 0 users logged in. Spacer ...

446

U-034: Fraudulent Digital Certificates Could Allow Spoofing ...  

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

Addthis PROBLEM: Fraudulent Digital Certificates Could Allow Spoofing. PLATFORM: Windows XP Service Pack 3 Windows XP Professional x64 Edition Service Pack 2 Windows Server...

447

Determining the specification of a control system: an illustrative example  

Science Conference Proceedings (OSTI)

Creating the specification of a system by focusing primarily on the detailed properties of the digital controller can lead to complex descriptions that are nearly incoherent. An argument given by Hayes, Jackson, and Jones provides reasons to focus first ...

Joey W. Coleman

2006-01-01T23:59:59.000Z

448

Direct Photons at RHIC  

E-Print Network (OSTI)

Direct photons are ideal tools to investigate kinematical and thermodynamical conditions of heavy ion collisions since they are emitted from all stages of the collision and once produced they leave the interaction region without further modification by the medium. The PHENIX experiment at RHIC has measured direct photon production in p+p and Au+Au collisions at 200 GeV over a wide transverse momentum ($p_T$) range. The $p$ + $p$ measurements allow a fundamental test of QCD, and serve as a baseline when we try to disentangle more complex mechanisms producing high $p_T$ direct photons in Au+Au. As for thermal photons in Au+Au we overcome the difficulties due to the large background from hadronic decays by measuring "almost real" virtual photons which appear as low invariant mass $e^+e^-$ pairs: a significant excess of direct photons is measured above the above next-to-leading order perturbative quantum chromodynamics calculations. Additional insights on the origin of direct photons can be gained with the study of the azimuthal anisotropy which benefits from the increased statistics and reaction plane resolution achieved in RHIC Year-7 data.

G. David; for the PHENIX Collaboration

2008-10-06T23:59:59.000Z

449

Direct conversion technology  

DOE Green Energy (OSTI)

The overall objective of the Direct Conversion Technology task is to develop an experimentally verified technology base for promising direct conversion systems that have potential application for energy conservation in the end-use sectors. This report contains progress of research on the Alkali Metal Thermal-to-Electric Converter (AMTEC) and on the Two-Phase Liquid-Metal MHD Electrical Generator (LMMHD) for the period January 1, 1991 through December 31, 1991. Research on AMTEC and on LMMHD was initiated during October 1987. Reports prepared on previous occasions (Refs. 1--5) contain descriptive and performance discussions of the following direct conversion concepts: thermoelectric, pyroelectric, thermionic, thermophotovoltaic, thermoacoustic, thermomagnetic, thermoelastic (Nitionol heat engine); and also, more complete descriptive discussions of AMTEC and LMMHD systems.

Massier, P.F.; Back, L.H.; Ryan, M.A.; Fabris, G.

1992-01-07T23:59:59.000Z

450

Digital Radiography and Computed Tomography (DRCT) Product Improvement Plan (PIP)  

SciTech Connect

The Idaho National Laboratory (INL) has been developing and deploying x-ray inspection systems for chemical weapons containers for the past 12 years under the direction of the Project Manager for Non-Stockpile Chemical Materiel (PMNSCM). In FY-10 funding was provided to advance the capabilities of these systems through the DRCT (Digital Radiography and Computed Tomography) Product Improvement Plan (PIP), funded by the PMNSCM. The DRCT PIP identified three research tasks; end user study, detector evaluation and DRCT/PINS integration. Work commenced in February, 2010. Due to the late start and the schedule for field inspection of munitions at various sites, it was not possible to spend sufficient field time with operators to develop a complete end user study. We were able to interact with several operators, principally Mr. Mike Rowan who provided substantial useful input through several discussions and development of a set of field notes from the Pueblo, CO field mission. We will be pursuing ongoing interactions with field personnel as opportunities arise in FY-11.

Tim Roney; Bob Pink; Karen Wendt; Robert Seifert; Mike Smith

2010-12-01T23:59:59.000Z

451

CONTROL FOR NEUTRONIC REACTOR  

DOE Patents (OSTI)

S>A control rod operating device in a nuclear reactor of the type in which the control rod is gradually withdrawn from the reactor to a position desired during stable operation is described. The apparatus is comprised essentially of a stop member movable in the direction of withdrawal of the control rod, a follower on the control rod engageable with the stop and means urging the follower against the stop in the direction of withdrawal. A means responsive to disengagement of the follower from the stop is provided for actuating the control rod to return to the reactor shut-down position.

Lichtenberger, H.V.; Cameron, R.A.

1959-03-31T23:59:59.000Z

452

A CMOS direct sampling mixer using switched capacitor filter technique for software-defined radio  

Science Conference Proceedings (OSTI)

This paper proposes a novel direct sampling mixer (DSM) using Switched Capacitor Filter (SCF) for multi-band receivers. The proposed DSM has a higher gain, more flexibility and lower flicker noise than that of conventional circuits. The mixer for Digital ...

Hong Phuc Ninh; Takashi Moue; Takashi Kurashina; Kenichi Okada; Akira Matsuzawa

2008-01-01T23:59:59.000Z

453

Direct Conversion Technology  

DOE Green Energy (OSTI)

The overall objective of the Direct Conversion Technology task is to develop an experimentally verified technology base for promising direct conversion systems that have potential application for energy conservation in the end-use sectors. Initially, two systems were selected for exploratory research and advanced development. These are Alkali Metal Thermal-to-Electric Converter (AMTEC) and Two-Phase Liquid Metal MD Generator (LMMHD). This report describes progress that has been made during the first six months of 1992 on research activities associated with these two systems. (GHH)

Back, L.H.; Fabris, G.; Ryan, M.A.

1992-07-01T23:59:59.000Z

454

Substation control and protection project  

SciTech Connect

This report describes the results of EPRI-sponsored Project RP1359-7, dealing with digital protection and control of transmission class substations. Earlier work involved a study of the feasibility of an integrated protection and control system, specification of functional requirements and selection of the optimum architecture for the system. An integrated system including line, bus and transformer protection was designed, built and laboratory tested. It was subsequently installed at the Deans substation of Public Service Electric and Gas (New Jersey). A standalone, digital transmission line system was built and installed at the Branchburg substation of PSE G, for coordinated line protection with the integrated system. The system is called WESPAC, an acronym for Westinghouse Substation Protection and Control. 52 refs., 174 figs.

Cassel, R.L.; Deliyannides, J.S.; Dzieduszko, J.W.; Harvey, J.H.; Hertz, L.H.; Klancher, F.; Mays, L.M.; McGarry, M.J.; Pettis, L.G.; Pistolese, L.F.; Reuther, J.F.; Sackin, M.; Szarmach, D.J.; Udren, E.A. (Westinghouse ABB Power T and D Co., Coral Springs, FL (USA). Relay and Telecommunications Div.)

1990-04-01T23:59:59.000Z

455

Direct Card. SPECIAL SITUATIONS  

E-Print Network (OSTI)

will be deducted. Rental cars Your Direct Card can be used to pay your final balance. Some companies may require cash at ATMs and banks No checks. No lines. No hassles. 24/7 Customer Support Get Account Information number or your date of birth (mm/dd). By activating your card, you accept the Terms and Conditions

Reynolds, Albert C.

456

Direct fired heat exchanger  

DOE Patents (OSTI)

A gas-to-liquid heat exchanger system which transfers heat from a gas, generally the combustion gas of a direct-fired generator of an absorption machine, to a liquid, generally an absorbent solution. The heat exchanger system is in a counterflow fluid arrangement which creates a more efficient heat transfer.

Reimann, Robert C. (Lafayette, NY); Root, Richard A. (Spokane, WA)

1986-01-01T23:59:59.000Z

457

Directional gamma detector  

DOE Patents (OSTI)

An improved directional gamma radiation detector has a collector sandwiched etween two layers of insulation of varying thicknesses. The collector and insulation layers are contained within an evacuated casing, or emitter, which releases electrons upon exposure to gamma radiation. Delayed electrons and electrons entering the collector at oblique angles are attenuated as they pass through the insulation layers on route to the collector.

LeVert, Francis E. (Downers Grove, Knoxville, TN); Cox, Samson A. (Downers Grove, IL)

1981-01-01T23:59:59.000Z

458

Analog-to-digital converter with data processing  

DOE Patents (OSTI)

This device incorporates an analog-digital converter including a data processing section which can be used to perform data processing on digitized data as is generated, off-line from the system processor. It consists of a 12 bit analog to digital converter for generating discrete digital data representative of an input analog signal, a data bus coupled to receive the digital data as is generated, a 512 Kbyte memory RAM to store the digitized data, and a system bus coupled to the data processing element for outputting the result of the performed operation. This is the first device with analog to digital converters and memory. It is the first module to be designed to the VXIbus format. This device is the first to incorporate an averaging circuit in the design. It has a sealed analog module (outputs the sum and difference of the log signals for both the X and the Y axis of the beam position module), memory channels, four averaging channels the programmable trigger and digitizer clock logic, and a VXIbus interface. This device is useful in the fields of data acquisition, data processing, communication systems, instrumentation and electronics.

Jones, A.

1993-01-01T23:59:59.000Z

459

Usage derived recommendations for a video digital library  

Science Conference Proceedings (OSTI)

We describe a minimalist methodology to develop usage-based recommender systems for multimedia digital libraries. A prototype recommender system based on this strategy was implemented for the Open Video Project, a digital library of videos that are freely ... Keywords: Open Video Project, Recommender systems, Usage analysis, Video

Johan Bollen; Michael L. Nelson; Gary Geisler; Raquel Araujo

2007-08-01T23:59:59.000Z

460

Make Money with your Digital Photography, 1st edition  

Science Conference Proceedings (OSTI)

Learn to find the opportunities and make money with your digital cameraMost digital photo buffs have thought about turning their hobby into a side business, but building a successful business takes more than passion and photographic skill. Erin Manning ...

Erin Manning

2011-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "direct digital controls" 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

Global Trends in Digital Governance: A Longitudinal Study  

Science Conference Proceedings (OSTI)

This paper highlights the research findings of a digital governance survey conducted in the fall of 2009. The study replicates previous surveys of large municipalities worldwide in 2007, 2005, and 2003. This longitudinal assessment, focused on the assessment ... Keywords: Citizen Participation, Digital Democracy, E-Governance, E-Government, Privacy, Services, Usability

Marc Holzer; Aroon Manoharan; Marc Fudge

2011-04-01T23:59:59.000Z

462

Supporting sociable literacy in the international children's digital library  

Science Conference Proceedings (OSTI)

As each generation of children grows up in a world shaped by the affordances available to them in both physical and digital environments, their expectations of tools to support changing literacy practices make new demands on technologists and designers. ... Keywords: children, contextual inquiry, cooperative inquiry, digital libraries, participatory design, sociable literacy

Nancy Kaplan; Yoram Chisik; Kendra Knudtzon; Rahul Kulkarni; Stuart Moulthrop; Kathryn Summers; Holly Weeks

2004-06-01T23:59:59.000Z

463

Cybercrime: Legal Standards Governing the Collection of Digital Evidence  

Science Conference Proceedings (OSTI)

The prosecution of cybercriminals depends upon the collection of digital evidence. In the United States, a complicated system of constitutional and statutory provisions govern what law enforcement officers can, and cannot, do in collecting digital evidence, ... Keywords: ECPA, Fourth Amendment, Patriot Act, Title III, wiretapping

Joseph J. Schwerha, IV

2004-06-01T23:59:59.000Z

464

A Measurement Framework for Evaluating Emulators for Digital Preservation  

Science Conference Proceedings (OSTI)

Accessible emulation is often the method of choice for maintaining digital objects, specifically complex ones such as applications, business processes, or electronic art. However, validating the emulator’s ability to faithfully reproduce the original ... Keywords: Emulation, automated testing, characteristics of rendered content, digital preservation, preserving interactive content, system properties

Mark Guttenbrunner; Andreas Rauber

2012-05-01T23:59:59.000Z

465

Robust Numerical Integration Using Wave-Digital Concepts  

Science Conference Proceedings (OSTI)

Numerical integration of linear and nonlinear ordinary and partial differential equations describing physically realistic systems can be achieved by means of principles derived from those originally developed in the context of wave digital filters, thus ... Keywords: Robust numerical integration, linear and nonlinear ordinary and partial differential equations, multidimensional causal and passive systems, wave-digital approach

Alfred Fettweis

2006-01-01T23:59:59.000Z

466

Transistor sizing for large combinational digital CMOS circuits  

Science Conference Proceedings (OSTI)

This article describes a new method to determine the device sizes of combinational digital CMOS circuits for an upper limit on the signal propagation delays. By modeling gate delay and area or power consumption of a circuit as a simple analytical function ... Keywords: Transistor sizing, digital combinational CMOS circuits, timing optimization

Lucas S. Heusler; Wolfgang Fichtner

1991-01-01T23:59:59.000Z

467

MPEG-21 digital items in research and practice  

Science Conference Proceedings (OSTI)

The aim of the MPEG-21 standard, the so-called Multimedia Framework, is to enable transparent and augmented use of multimedia resources across a wide range of networks, devices, user preferences, and communities, notably for trading (of bits). As such, ... Keywords: DANAE, ENTHRONE, MPEG-21, P2P-Next, UPnP, application, digital item, digital library, usage

Christian Timmerer; Hermann Hellwagner

2010-04-01T23:59:59.000Z

468

Simulation of implosion and transportation of ore in digital mine  

Science Conference Proceedings (OSTI)

Digital mining technology and software development are essential for informatization in China coal industry. We adopt .net3.0 platform and OpenGL graphics library to develop a system to simulate the process of ore's implosion and the process of ore's ... Keywords: digital mine, particle system, simulation of implosion, transportation of ore

Xixi Huang; Dongyong Yan; Fuli Wu; Nan Xiang; Mingmin Zhang

2011-01-01T23:59:59.000Z

469

Query parameters for harvesting digital video and associated contextual information  

Science Conference Proceedings (OSTI)

Video is increasingly important to digital libraries and archives as both primary content and as context for the primary objects in collections. Services like YouTube not only offer large numbers of videos but also usage data such as comments and ratings ... Keywords: digital curation, harvesting, video mining

Gary Marchionini; Chirag Shah; Christopher A. Lee; Robert Capra

2009-06-01T23:59:59.000Z

470

A collusion attack optimization strategy for digital fingerprinting  

Science Conference Proceedings (OSTI)

Collusion attack is a cost-efficient attack for digital fingerprinting. In this article, we propose a novel collusion attack strategy, Iterative Optimization Collusion Attack (IOCA), which is based upon the gradient attack and the principle of ... Keywords: Multimedia security, collusion attack, digital fingerprinting, optimization

Hui Feng; Hefei Ling; Fuhao Zou; Weiqi Yan; Zhengding Lu

2012-09-01T23:59:59.000Z

471

Browse and Search Patterns in a Digital Image Database  

Science Conference Proceedings (OSTI)

A prototype image retrieval system with browse and search capabilities was developed to investigate patterns of searching a collection of digital visual images, as well as factors, such as image size, resolution, and download speed, which affect browsing. The ... Keywords: browsing, digital images, image retrieval, user studies

C. Olivia Frost; Bradley Taylor; Anna Noakes; Stephen Markel; Deborah Torres; Karen M. Drabenstott

2000-01-01T23:59:59.000Z

472

Network Electricity Use Associated with Wireless Personal Digital Assistants  

E-Print Network (OSTI)

Network Electricity Use Associated with Wireless Personal Digital Assistants Jonathan Koomey1 the widely cited claim that the network electricity use associated with a wireless personal digital assistant PDA is equal to the electricity consumed by a refrigerator. It compiles estimates of the data flows

Kammen, Daniel M.

473

Class 1E digital systems studies  

SciTech Connect

This document is furnished as part of the effort to develop NRC Class 1E Digital Computer Systems Guidelines which is Task 8 of USAF Rome Laboratories Contract F30602-89-D-0100. The report addresses four major topics, namely, computer programming languages, software design and development, software testing and fault tolerance and fault avoidance. The topics are intended as stepping stones leading to a Draft Regulatory Guide document. As part of this task a small scale survey of software fault avoidance and fault tolerance practices was conducted among vendors of nuclear safety related systems and among agencies that develop software for other applications demanding very high reliability. The findings of the present report are in part based on the survey and in part on review of software literature relating to nuclear and other critical installations, as well as on the authors` experience in these areas.

Hecht, H.; Tai, A.T.; Tso, K.S. [SoHaR, Inc., Beverly Hills, CA (United States)

1993-10-01T23:59:59.000Z

474

Storage and retrieval of large digital images  

DOE Patents (OSTI)

Image compression and viewing are implemented with (1) a method for performing DWT-based compression on a large digital image with a computer system possessing a two-level system of memory and (2) a method for selectively viewing areas of the image from its compressed representation at multiple resolutions and, if desired, in a client-server environment. The compression of a large digital image I(x,y) is accomplished by first defining a plurality of discrete tile image data subsets T{sub ij}(x,y) that, upon superposition, form the complete set of image data I(x,y). A seamless wavelet-based compression process is effected on I(x,y) that is comprised of successively inputting the tiles T{sub ij}(x,y) in a selected sequence to a DWT routine, and storing the resulting DWT coefficients in a first primary memory. These coefficients are periodically compressed and transferred to a secondary memory to maintain sufficient memory in the primary memory for data processing. The sequence of DWT operations on the tiles T{sub ij}(x,y) effectively calculates a seamless DWT of I(x,y). Data retrieval consists of specifying a resolution and a region of I(x,y) for display. The subset of stored DWT coefficients corresponding to each requested scene is determined and then decompressed for input to an inverse DWT, the output of which forms the image display. The repeated process whereby image views are specified may take the form an interaction with a computer pointing device on an image display from a previous retrieval. 6 figs.

Bradley, J.N.

1998-01-20T23:59:59.000Z

475

Synchronous Squamous Cell Carcinoma in Multiple Digits  

E-Print Network (OSTI)

Cancers of the perionychium are relatively rare occurrences and are often related to chronic inflammation associated with trauma, infection, exposure to ultraviolet radiation, or other carcinogens. Squamous cell carcinoma is the most common tumor reported of the nail bed. Synchronous squamous cell carcinomas of the perionychium have been rarely reported. We present a case of a 46-year-old woman with synchronous squamous cell carcinomas involving both hands and multiple digits. Treatment modalities include chemotherapeutics, Mohs surgery, and amputation. Early diagnosis of squamous cell carcinoma of the nail bed provides the greatest chance to preserve maximal function of the hand. Onychomycosis may be the presenting symptom of a patient with squamous cell carcinoma and may also be a predisposing factor in patients with occupational risk factors. Suspicion of this disease process can help the clinician establish the diagnosis via biopsy and provide optimal care for these patients. Cancers of the perionychium are relatively rare occurrences and are often related to chronic inflammation associated with trauma, infection, exposure to ultraviolet radiation, or other carcinogens. Squamous cell carcinoma is the most common tumor reported of the nail bed. Synchronous squamous cell carcinomas of the perionychium have been rarely reported. We present a case of a 46-year-old woman with synchronous squamous cell carcinomas involving both hands and multiple digits. CASE REPORT A 46-year-old white female was referred from the dermatology clinic with a biopsy-proven squamous cell carcinoma of the left ring finger perionychium. Physical examination demonstrated erythematous scaly lesions with the absence of a nail plate at the left thumb, index Authors have no financial disclaimers or conflicts to disclose. 70 ABNER ET AT finger, and ring finger as well as the right long finger, without associated lymphadenopathy (Fig 1). She described chronic onychomycosis of the nails attributed to her job as a dishwasher.

Morton L. Kasdan; Bradon J. Wilhelmi; Mda A B

2011-01-01T23:59:59.000Z

476

DIALOG: A framework for modeling, analysis and reuse of digital forensic knowledge  

Science Conference Proceedings (OSTI)

This paper presents DIALOG (Digital Investigation Ontology); a framework for the management, reuse, and analysis of Digital Investigation knowledge. DIALOG provides a general, application independent vocabulary that can be used to describe an investigation ... Keywords: Digital, Investigation, Ontology, Registry, Windows

Damir Kahvedi?; Tahar Kechadi

2009-09-01T23:59:59.000Z

477

Measurement of focal spot size with slit camera using computed radiography and flat-panel based digital detectors  

Science Conference Proceedings (OSTI)

The purpose of this study was to evaluate the use of digital x-ray imagingdetectors for the measurement of diagnostic x-ray tube focal spot size using a slit camera. Slit cameraimages of two focal spots for a radiographicx-ray tube were acquired with direct-exposure film (DF) (as specified by the National Electrical Manufacturers Association [NEMA] Standards Publication No. XR 5

Xiujiang J. Rong; Kerry T. Krugh; S. Jeff Shepard; William R. Geiser

2003-01-01T23:59:59.000Z

478

Dynamic controls for energy efficiency and demand response: Framework concepts and a new construction study case in new york  

E-Print Network (OSTI)

Many of today’s advanced building control systems are designed to improve granularity of control for energy efficiency. Examples include direct digital controls for building heating, ventilation, and cooling systems (HVAC), and dimmable ballasts for continuous dimming for daylighting applications. This paper discusses recent research on the use of new and existing controls in commercial buildings for integrated energy efficiency and demand response (DR). The paper discusses the use of DR controls strategies in commercial buildings and provides specific details on DR control strategy design concepts for a new building in New York. We present preliminary results from EnergyPlus simulations of the DR strategies at the New York Times Headquarters building currently under construction. The DR strategies at the Times building involve unique state of the art systems with dimmable ballasts, movable shades on the glass facade, and underfloor air HVAC. The simulation efforts at this building are novel, with an innovative building owner considering DR and future DR program participation strategies during the design phase. This paper also discusses commissioning plans for the DR strategies. The trends in integration of various systems through the EMCS, master versus supervisory controls and dynamic operational modes concepts are presented and future research directions are outlined.

Sila Kiliccote; Mary Ann Piette; David S. Watson; Glenn Hughes; Sila Kiliccote Mary Ann Piette; David S. Watson

2006-01-01T23:59:59.000Z

479

Dynamic Controls for Energy Efficiency and Demand Response:Framework Concepts and a New Construction Study Case in New York  

SciTech Connect

Many of today's advanced building control systems are designed to improve granularity of control for energy efficiency. Examples include direct digital controls for building heating, ventilation, and cooling systems (HVAC), and dimmable ballasts for continuous dimming for daylighting applications. This paper discusses recent research on the use of new and existing controls in commercial buildings for integrated energy efficiency and demand response (DR). The paper discusses the use of DR controls strategies in commercial buildings and provides specific details on DR control strategy design concepts for a new building in New York. We present preliminary results from EnergyPlus simulations of the DR strategies at the New York Times Headquarters building currently under construction. The DR strategies at the Times building involve unique state of the art systems with dimmable ballasts, movable shades on the glass facade, and underfloor air HVAC. The simulation efforts at this building are novel, with an innovative building owner considering DR and future DR program participation strategies during the design phase. This paper also discusses commissioning plans for the DR strategies. The trends in integration of various systems through the EMCS, master versus supervisory controls and dynamic operational modes concepts are presented and future research directions are outlined.

Kiliccote, Sila; Piette, Mary Ann; Watson, David S.; Hughes, Glenn

2006-06-20T23:59:59.000Z

480

Dynamic Controls for Energy Efficiency and Demand Response:Framework Concepts and a New Construction Study Case in New York  

SciTech Connect

Many of today's advanced building control systems are designed to improve granularity of control for energy efficiency. Examples include direct digital controls for building heating, ventilation, and cooling systems (HVAC), and dimmable ballasts for continuous dimming for daylighting applications. This paper discusses recent research on the use of new and existing controls in commercial buildings for integrated energy efficiency and demand response (DR). The paper discusses the use of DR controls strategies in commercial buildings and provides specific details on DR control strategy design concepts for a new building in New York. We present preliminary results from EnergyPlus simulations of the DR strategies at the New York Times Headquarters building currently under construction. The DR strategies at the Times building involve unique state of the art systems with dimmable ballasts, movable shades on the glass facade, and underfloor air HVAC. The simulation efforts at this building are novel, with an innovative building owner considering DR and future DR program participation strategies during the design phase. This paper also discusses commissioning plans for the DR strategies. The trends in integration of various systems through the EMCS, master versus supervisory controls and dynamic operational modes concepts are presented and future research directions are outlined.

Kiliccote, Sila; Piette, Mary Ann; Watson, David S.; Hughes, Glenn

2006-06-20T23:59:59.000Z

Note: This page contains sample records for the topic "direct digital controls" from the National Library of EnergyBeta (NLEBeta).
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481

Direct insolation models  

DOE Green Energy (OSTI)

Several recently published models of the direct component of the broadband insolation are compared for clear sky conditions. The comparison includes seven simple models and one rigorous model that is used as a basis for determining accuracy. Where possible, the comparison is made between the results of each model for each atmospheric constituent (H/sub 2/O, CO/sub 2/, O/sub 3/, O/sub 2/, aerosol and molecular scattering) separately as well as for the combined effect of all of the constituents. Two optimum simple models of varying degrees of complexity are developed as a result of this comparison. The study indicates: aerosols dominate the attenuation of the direct beam for reasonable atmospheric conditions; molecular scattering is next in importance; water vapor is an important absorber; and carbon dioxide and oxygen are relatively unimportant as attenuators of the broadband solar energy.

Bird, R.; Hulstrom, R.L.

1980-01-01T23:59:59.000Z

482

EXPERIMENTAL TEST FACILITY FOR EVALUATION OF CONTROLS AND CONTROL STRATEGIES  

E-Print Network (OSTI)

Pseudo collector vs Return boiler V2 Direct heating Supplysensors Flow switches Boiler enable I DORIC 220 data loggercollector, consists of a boiler with a controlled mixing

Warren, Mashuri L.

2013-01-01T23:59:59.000Z

483

A Security Study of Digital TV Distribution Systems  

E-Print Network (OSTI)

1 This Thesis corresponds to 20 weeks of full-time work for the authors. For digital TV distribution, the current predominant business model is vertical. That is, TV operators and end users are locked to some certain proprietary conditional access (CA) systems, CA vendors control set-top-box manufacturers with their proprietary technology, and subscribers can achieve new services at the cost of changing STBs. Thus the horizontal business model is required to enable the open and competing market for any TV operator, and the attractive services for subscribers. The SSNF 2 is making efforts on providing households high quality TV services over the urban networks, where households can freely choose the competing offerings via an open platform. The traditional battleground of TV operators is in broadcast networks; however, the more mature IP technology becomes, TV operators will increase interests in providing services in IP networks. Furthermore, TV operators are aware of the possible additional value from the mobile distribution channel due to the evolution of cellular networks from “pure voice telephony networks to universal data networks ” [67].

Nariman Molavi; Xu Zhao; Copyright Nariman Molavi; Xu Zhao

2005-01-01T23:59:59.000Z

484

Capacitor charging FET switcher with controller to adjust pulse width  

DOE Green Energy (OSTI)

A switching power supply includes an FET full bridge, a controller to drive the FETs, a programmable controller to dynamically control final output current by adjusting pulse width, and a variety of protective systems, including an overcurrent latch for current control. Power MOSFETS are switched at a variable frequency from 20-50 kHz to charge a capacitor load from 0 to 6 kV. A ferrite transformer steps up the DC input. The transformer primary is a full bridge configuration with the FET switches and the secondary is fed into a high voltage full wave rectifier whose output is connected directly to the energy storage capacitor. The peak current is held constant by varying the pulse width using predetermined timing resistors and counting pulses. The pulse width is increased as the capacitor charges to maintain peak current. A digital ripple counter counts pulses, and after the desired number is reached, an up-counter is clocked. The up-counter output is decoded to choose among different resistors used to discharge a timing capacitor, thereby determining the pulse width. A current latch shuts down the supply on overcurrent due to either excessive pulse width causing transformer saturation or a major bridge fault, i.e., FET or transformer failure, or failure of the drive circuitry.

Mihalka, Alex M. (Livermore, CA)

1986-01-01T23:59:59.000Z

485

Achieving Better Building Performance and Savings Using Optimal Control Strategies  

E-Print Network (OSTI)

The Continuous Commissioning (CCSM) process has become a very important energy conservation topic for new and existing commercial buildings. This process can yield substantial operating savings, improved indoor air quality, and enhanced occupant comfort. It also provides solutions to reoccurring building maintenance problems. One tool that can be implemented during commissioning work is a nearoptimal global set point method in an Energy Management Control System (EMCS) Direct Digital Controller (DDC). This algorithm is based on mathematical models for the chillers, boilers, chilled and hot water pumps, and air handler fans that relate the power of these components as a function of the chilled water and hot water differential temperature. The algorithm will minimize the total plant power consumption. These optimal control strategies make the CC process more effective. The Texas A&M University Systems State Headquarters is an office building, with a total floor area of approximately 123,960 ft2. An integrated commissioning of the HVAC systems was performed for this building. This paper describes the commissioning activities and demonstrates how newly developed optimized control strategies improved the building comfort conditions and reduced utility costs during and after the commissioning period.

Chen, H.; Deng, S.; Bruner, H.

2003-01-01T23:59:59.000Z

486

The Digital-Surrogate Seal of Approval: a Consumer-oriented Standard  

E-Print Network (OSTI)

A Resource List for Standards Related to Digital Imaging ofa Consumer-oriented Standard James A. Jacobs University ofJustification of a New Standard Digitization of existing

Jacobs, James A; Jacobs, James R

2013-01-01T23:59:59.000Z

487

An introduction to Digital Addressable Lighting Interface (DALI) systems & study of a DALI day lighting application.  

E-Print Network (OSTI)

??The DALI (Digital Addressable Lighting Interface) protocol has set forth the requirements for a digital fluorescent ballast that out performs its predecessors with respect to… (more)

Meyer, Lisa

2007-01-01T23:59:59.000Z

488

Vendor-neutral case input and window and level managemnet for a digital teaching file system;.  

E-Print Network (OSTI)

??Although digital teaching files are important to radiology education, there is no current satisfactory solutions for export of Digital Imaging and Communications in Medicine (DICOM)… (more)

Kamauu, Aaron Wailana Charles

2006-01-01T23:59:59.000Z

489

Letter: Direction and Guidance for Implementing Direct DOE Relationship &  

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

Letter: Direction and Guidance for Implementing Direct DOE Letter: Direction and Guidance for Implementing Direct DOE Relationship & Funding for EMSSABs Letter: Direction and Guidance for Implementing Direct DOE Relationship & Funding for EMSSABs From: Assistant Secretary, Jessie Hill Roberson (EM-11) To: Mr. Monte Wilson, Chair, INEEL Citizens Advisory Board This letter is in response to a November 21, 2003 letter regarding direction and guidance for implementing direct DOE relationship and funding for Environmental Management Site Specific Advisory Boards. Roberson Letter - December 12, 2003 More Documents & Publications Letter: Progress in Implementing a Direct DOE Relationship & Funding for the EMSSABs Letter: Mission, Objectives & Scope of the Site Specific Advisory Board Memorandum: Direction and Guidance for Implementing Direct DOE Relationship

490

Letter: Direction and Guidance for Implementing Direct DOE Relationship &  

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

Letter: Direction and Guidance for Implementing Direct DOE Letter: Direction and Guidance for Implementing Direct DOE Relationship & Funding for EMSSABs Letter: Direction and Guidance for Implementing Direct DOE Relationship & Funding for EMSSABs From: Assistant Secretary, Jessie Hill Roberson (EM-11) To: Mr. Monte Wilson, Chair, INEEL Citizens Advisory Board This letter is in response to a November 21, 2003 letter regarding direction and guidance for implementing direct DOE relationship and funding for Environmental Management Site Specific Advisory Boards. Roberson Letter - December 12, 2003 More Documents & Publications Letter: Progress in Implementing a Direct DOE Relationship & Funding for the EMSSABs Letter: Mission, Objectives & Scope of the Site Specific Advisory Board Memorandum: Direction and Guidance for Implementing Direct DOE Relationship

491

Resilient Control Systems: Next Generation Design Research  

Science Conference Proceedings (OSTI)

Since digital control systems were introduced to the market more than 30 years ago, the operational efficiency and stability gained through their use have fueled our migration and ultimate dependence on them for the monitoring and control of critical infrastructure. While these systems have been designed for functionality and reliability, a hostile cyber environment and uncertainties in complex networks and human interactions have placed additional parameters on the design expectations for control systems.

Craig Rieger

2009-05-01T23:59:59.000Z

492

Available Technologies: Spatially Controlled Surface ...  

This spatial control of functionality is very difficult to achieve with non-grafting techniques currently in use such as direct copolymerization, ...

493

Personalized HVAC control system  

E-Print Network (OSTI)

We present a novel method of building comfort control, focused around the occupant. Custom sensing, communication, and actuation hardware were developed to locate users in a building, and measure various parameters directly ...

Feldmeier, Mark Christopher

494

Art Directable Tornadoes  

E-Print Network (OSTI)

Tornado simulations in the visual effects industry have always been an interesting problem. Developing tools to provide more control over such effects is an important and challenging task. Current methods to achieve these effects use either particle systems or fluid simulation. Particle systems give a lot of control over the simulation but do not take into account the fluid characteristics of tornadoes. The other method which involves fluid simulation models the fluid behavior accurately but does not give control over the simulation. In this thesis, a novel method to model tornado behavior is presented. A tool based on this method was also created. The method proposed in this thesis uses a hybrid approach that combines the flexibility of particle systems while producing interesting swirling motions inherent in the fluids. The main focus of the research is on providing easy-to-use controls for art directors to help them achieve the desired look of the simulation effectively. A variety of controls is provided which include the overall shape, path, rotation, debris, surface, swirling motion, and interaction with the environment. The implementation was done in Houdini, which is a 3D animation software whose node based system allows an algorithmic approach to the problem and integrates well with the current tools. The tool allows the user to create animations that reflect the visual characteristics of real tornadoes. The usefulness of the tool was evaluated among participants who had some experience in 3D animation software. The results from the simulation and evaluation feedback reveal that the tool successfully allowed the users to create tornadoes of their choice efficiently.

Dwivedi, Ravindra

2011-05-01T23:59:59.000Z

495

Our purpose and direction Our purpose and direction  

E-Print Network (OSTI)

1 Our purpose and direction #12;Our purpose and direction Contents MINISTERS' FOREWORD 3 organisation 8 Our People 8 Our finances 8 Business sustainability ­ `Greenerways' 9 OUR DIRECTION 10 Our: Financial resources 56 2 #12;Our purpose and direction Ministers' Foreword I am very pleased to be providing

496

Our purpose and direction Our purpose and direction  

E-Print Network (OSTI)

1 Our purpose and direction #12;Our purpose and direction Contents MINISTERS' FOREWORD 3 8 Our People 8 Our finances 8 Business sustainability ­ `Greenerways' 9 OUR DIRECTION 10 Our Appendix 2: Business measures 55 Appendix 3: Financial resources 56 2 #12;3 Our purpose and direction

497

General application of rapid 3-D digitizing and tool path generation for complex shapes  

SciTech Connect

A system for automatic tool path generation was developed at Sandia National Laboratories for finish machining operations. The system consists of a commercially available 5-axis milling machine controlled by Sandia developed software. This system was used to remove overspray on cast turbine blades. A laser-based, structured-light sensor, mounted on a tool holder, is used to collect 3D data points around the surface of the turbine blade. Using the digitized model of the blade, a tool path is generated which will drive a 0.375 inch grinding pin around the tip of the blade. A fuzzified digital filter was developed to properly eliminate false sensor readings caused by burrs, holes and overspray. The digital filter was found to successfully generate the correct tool path for a blade with intentionally scanned holes and defects. The fuzzified filter improved the computation efficiency by a factor of 25. For application to general parts, an adaptive scanning algorithm was developed and presented with simulation and experimental results. A right pyramid and an ellipsoid were scanned successfully with the adaptive algorithm in simulation studies. In actual experiments, a nose cone and a turbine blade were successfully scanned. A complex shaped turbine blade was successfully scanned and finished machined using these algorithms.

Kwok, K.S.; Loucks, C.S.; Driessen, B.J.

1997-09-01T23:59:59.000Z

498

Breakout Session -- TEC Direction  

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

III: TEC III: TEC Direction and Priorities Presented to: Transportation External Coordination Working Group Presented by: Alex Thrower Office of Logistics Management February 7, 2008 San Antonio, Texas 2 Topics of Discussion * Transportation External Coordination Working Group (TEC) charter and membership * Topic group functions * Meeting format 3 TEC Charter and Membership * Mission - TEC was formed in 1992 to improve coordination among the Department of Energy (DOE) and external groups interested in the Department's transportation activities The Office of Civilian Radioactive Waste Management (OCRWM) co-chairs TEC with DOE's Environmental Management Program Provides an opportunity for broad based input and information exchange from varied organizations - Members meet semi-annually to participate in

499

Omni-directional railguns  

DOE Patents (OSTI)

This invention is comprised of a device for electromagetically accelerating projectiles. The invention features two parallel conducting circular plates, a plurality of electrode connections to both upper and lower plates, a support base, and a projectile magazine. A projectile is spring-loaded into a firing position concentrically located between the parallel plates. A voltage source is applied to the plates to cause current to flow in directions defined by selectable, discrete electrode connections on both upper and lower plates. Repulsive Lorentz forces are generated to eject the projectile in a 360 degree range of fire.

Shahinpoor, M.

1994-12-31T23:59:59.000Z

500

Measuring microfocal spots using digital radiography  

SciTech Connect

Measurement of microfocus spot size can be important for several reasons: (1) Quality assurance during manufacture of microfocus tubes; (2) Tracking performance and stability of microfocus tubes; (3) Determining magnification is especially important for digital radiography where the native spatial resolution of the digital system is not adequate for the application; and (4) Knowledge of unsharpness from the focal spot alone. The European Standard EN 12543-5 is based on a simple geometrical method of calculating focal spot size from unsharpness of high magnification film radiographs. The following equations are used for the focal spot size measurement: By similar triangles the following equations are presupposed: f/a = U/b and M = (a+b)/a. These equations can be combined to yield the well known expression: U = f(M - 1). Solving for f, f = U/(M-1). Therefore, the focal spot size, f, can be calculated by measuring the radiographic unsharpness and magnification of a known object. This is the basis for these tests. The European standard actually uses one-half of the unsharpness (which are then added together) from both sides of the object to avoid additional unsharpness contributions due to edge transmission unsharpness of the round test object (the outside of the object is measured). So the equation becomes f = (1/2 U{sub 1} + 1/2 U{sub 2})/(M-1). In practice 1/2 U is measured from the 50% to the 90% signal points on the transition profile from ''black'' to ''white,'' (positive image) or attenuated to unattenuated portion of the image. The 50% to 90% points are chosen as a best fit to an assumed Gaussian radiation distribution from the focal spot and to avoid edge transmission effects. 1/2 U{sub 1} + 1/2 U{sub 2} corresponds about to the full width at half height of a Gaussian focal spot. A highly absorbing material (Tungsten, Tungsten Alloy, or Platinum) is used for the object. Either wires or a sphere are used as the object to eliminate alignment issues. One possibility is to use the wires in the ASTM E2002 unsharpness gage and take two orthogonal images. The signal levels in the image need to be linear with radiation exposure and so may need conversion if a nonlinear detector is used to acquire the image.

Fry, David A [Los Alamos National Laboratory; Ewert, Uwe [BAM

2009-01-01T23:59:59.000Z